2013年9月28日星期六

English expression fittings

Some of pipe fittings industry jargon is no specific point in the online English translation, the major off pipe fittings manufacturers also do not have English Introduction. Such as tube fittings, terminal through connector, plug-welding elbow, two-way connector body and so on. Tee: three-way pipe connector terminal through connector: Straight thread connector plug welding elbow: Through welded elbow-way connector body: bidirectional Hydraulic ferrules pipe fittings, intubation pieces, threaded pipe fittings Butt-English names are welding fitting (referred BW Fitting), Socket welding fitting (abbreviated SW fitting), Threaded fitting. Fittings, pipe fittings may be on domestic non-standard argument. About the tee, is divided into equal tee (Equal Tee), also known as straight tee (Straight Tee), and reducing tee or Reducing Tee (Reducing Tee), in the actual business dealings, the general would not have said fitting it.

Cracking Analysis of high-pressure metal hoses

Chemical composition of the base metal hoses meet the standard requirements , microstructure normal . Failure hose member and the base metal and weld finished piece unused micro-cracks are present on the hose , the hose which indicates that micro-cracks before they are used . According to the position and shape of micro-cracks can be divided into two categories: one is located on the weld , the weld along the direction of the main direction of the crack , in addition to many cracks perpendicular to the main secondary cracks , these cracks are located weld intergranular columnar crystal Hydraulic tube fittings is formed when the welding weld cracking ; second crest of microcracks in the inner surface of the hose , these micro- cracks in the circumferential direction along the hose (Up direction perpendicular to the weld ). and substantially parallel to each other , since the majority of these micro-cracks exist in the inner surface of the crest , and the analyzes were performed by location and morphology with regularity , so these cracks should be rolling waves generated when processing cracks. In welding and molding process , the micro crack initiation at the inner surface of the hose in the subsequent assembly process of trial and the use of extended fatigue microcracks , finally cracked through , causing oil spills . Recommended welding hose and processing to improve, in order to avoid the generation of microcracks .

Metal hose is an essential component of modern pipeline

Metal hose because it has a good seal, pressure resistance, high temperature resistance, corrosion resistance, and certain other properties available around the song has become an essential component of modern pipeline. Metal hose can be used for chemical piping systems superheated vapor tube, Hydraulic ferrules and pneumatic equipment, high-pressure pipeline, the transmission medium, pipes and other drug burst, the role is to absorb the reciprocating movement, absorb thermal expansion, vibration absorption, compensation pipe installation deviation. Because metal hose complicated forces at work, poor working conditions, so the accurate representation of the force metal hose there are considerable difficulties. Largely by the bellows metal hose, and fittings nets three parts. Corrugated metal hose pipe is the subject of the role played around; nets from enhanced shielding effect; joint plays a role in the connection.

Metal hose reel machine nonmetal parts cleaning method

Metal hose reel machine nonmetal parts cleaning method - in metal hose machine with metal parts , there are also non-metallic parts, metal hose machine maintenance , it is necessary for some spare parts for cleaning. Clean metal parts , generally diesel , petrol or cleaning agents. However, in cleaning metallic parts, can not be used diesel oil, gasoline and the like for cleaning it. Otherwise, it will make some non-metallic parts deformation , deterioration or failure . Therefore, the non-metallic parts should be based on different materials , use of different Hydraulic pipe fittings.1 , is to clean friction plate, such as the clutch friction plate, brake linings , etc., can only use petrol to clean.2, which is made ​​of rubber parts cleaning , such as rubber sheet , aprons , etc., should be cleaned with alcohol or brake fluid .3 , is to clean paper parts, can not be washed with water in the diesel fuel to clean.4 , is made ​​of parts cleaning foam should use detergent or soap and water.5 , is to clean leather accessories, such as drive belts , etc., they can be washed or wiped clean with a cloth

Metal hose selection

For a given length and specifications of metal hoses, their ability to withstand stress and shock have certain limits, therefore, when used according to the actual situation. Generally used nominal diameter Hydraulic hose fittings the same nominal diameter, hose length array according to Shen tank temperature deformation, misalignment and earthquakes and other factors to determine the lateral displacement produced. The metal bellows tube, nets of three parts and connectors, bellows are made ​​of stainless steel, has a good flexibility, its longitudinal rigidity and bending rigidity is small, within a radius of curvature at the rated working, with a strong corrosion resistance and good temperature stability. Nets from strengthening the role of the metal hose has a large carrying capacity. Therefore, the metal hose with shock, subjected to bending, absorb stress.

Resistant metal hose

Resistant metal hose coal injection system in ironmaking, steelmaking refining furnace and other solid materials to ease the occasion, with ordinary metal hose soon frayed, Huasheng pipe fittings manufactured using wear resistant stainless steel corrugated hose advanced technology from developed, proved through practice, high-speed flow in the pipe body particle abrasion, long service life.
Wear-resistant metal Hydraulic hose fittings body using multi-layer composite structure, followed by heat from outside to inside layer of asbestos cloth, wire mesh layer, a metal layer and a trapezoidal cross-section bellows wound metal hose layer. Its layers and hoop ends welded together tight combinations, hose quick connector used between the body. The metal hose better solution because partial burning of the surface and the inner tube wear two major problems affecting the service life of metal hose, metal hose and compared to similar existing product life greatly improved, the relative cost of production significantly reduced iron plant particularly suitable application technique used in pulverized coal injection.

Corrugated metal hose is a modern industrial pipeline a high quality flexible pipe

Corrugated metal hose ( short hose ) is a modern industrial pipeline a high quality flexible pipe . It mainly consists of bellows, nets and joint components. Its inner tube is a spiral or annular waveform walled stainless steel bellows , bellows outer nets, is made of stainless steel wire or woven according to certain parameters . Hose Hydraulic tube fittings or flanges at both ends of the pipe joints with customers or flange mating .Bellows hose is made of very thin-walled stainless steel seamless or longitudinal weld precision plastic processing after forming . Because the elastic property of the bellows determine the contour hose has good flexibility and fatigue resistance , making it very easy to absorb deformation and cyclic loading various sports , especially in the piping system has the ability to compensate for a large amount of displacement . I plant in addition to the original hose sophisticated production equipment, recently introduced from Japan two high-precision , high-tech molded bellows automatic welding production lines, greatly improved the quality of the hose and the hose length is not produced limits , to meet the needs of long hose . Dawn brand hose nominal diameter range of DN4-800mm, length optional. Nets are installed in the pressure line hose main pressure parts , while the bellows from the sheath effect, according to the size of pipeline pressure and locations , you can select one or more layers of stainless steel wire or steel strip weaving, dawn brand hose pressure range is generally PN0.6-32.0Mpa. Up to 42.0MPa. The production of the main part of the material hose is the use of austenitic stainless steel , thus ensuring the hose excellent in heat resistance and corrosion resistance of the hose very wide temperature range , is -196-600 degrees to hose by pipelines through the media choose to apply corrosive stainless steel grades, the corrosion resistance of the hose can be guaranteed . Corrugated metal hose has good flexibility, fatigue resistance, high pressure, high temperature resistance, corrosion resistance , and many other features, it is relative to other hoses ( rubber, plastic hose ) much higher lifetime would therefore it also has a high overall economic efficiency . With the development of modern industry , for high temperature, high pressure hose corrugated metal demand is also getting bigger . Hose Scope: need fully flexible pipes, to prevent vibration premises piping for steam, gas , air, heavy oil, petroleum, chemical -pharmaceutical etc apply.

2013年9月27日星期五

Hose technical knowledge

With the rapid development of modern industry and the mutual penetration of various disciplines, metal hose in the machinery manufacturing, petrochemical, instrumentation, and is widely used on various projects. Nearly three decades, it has expanded used in aerospace, aviation, nuclear power, shipbuilding, electronics and new construction and other industrial sectors, a modern engineering technology indispensable accessory, plays a prominent role. In China, it appears the early fifties the most Hydraulic tube fittings  metal hose, which is based on the strip is wrapped around the body of the bellows. However, it is developing very fast, after five years or so, we have gone through other countries traveled nearly a hundred years. Currently, we have been able to produce some reached the international advanced level of metal hose. However, due to technical exchange and standardization issues, a number of technical personnel in the field of design of the structural characteristics of modern metal hose, performance indicators is not very clear, resulting in a lot of new metal hose should use the occasion still use those structures in the form of relatively old metal hose, rubber tubes and plastic tubes. Universal metal hose technical knowledge, is to enable more people to become familiar with and master the knowledge of modern metal hose for wider and more reasonable to use it.

Metal hose pavement construction requirements

Metal hose construction, the use of sub-construction method, previously used in the original arch culvert base angle side by side two, the length determined based on long culvert. Culvert advance for the rails, corrugated culvert pipe diameter according to project needs may have different specifications, ready to pipe diameter of 0.5m - 2.5m; each section of pipe length 3 meters. Using internal (external) flange bolts. Assembled pipe diameter of 3m - 8m. Each circumferential direction 4 --- 15 plates, lap board and the board strength bolts tightened. If Han longer than 30 meters, the corrugated culvert culvert sides of the original width of less than 80cm, length 3m-6m may be downstream or upstream culvert advance toward the one end, in place later, it can be fixed to the top of the sheet rock masonry end wall, the other end of the corrugated culvert culvert with sandbags or the distance between the mortar and stone block, width 50cm, then start filling. Both sides of the law can be dense or coarse watertight concrete pouring Vibes tamping; top with high-pressure pumping expansive cement mortar. This section tube four weeks after they have finished filling the second pipe shipped to carry two connections, corrugated culvert pipe are connected to the inner flange bolting, workers in the pipe connection. After connecting to the same method as backfill. In this order, to complete the construction of the entire road corrugated culvert work. Metal hose adapter, according to the selection of electrical equipment into the cable connector metal hoses and metal Hydraulic hose fittings , metal hose fittings according to the size of the transition metal hose connector panel mounted connector and metal hose, so that the whole system is naturally smooth; transition joints can either press the need to produce at the construction site can also be mass-produced in the factory according to standard parts, with the use of promotional value; cable can extend the life of the cable to be effective in preventing injury leakage and other external forces generated security incidents.

Stainless steel plastic coated metal hose has good flexibility

Stainless steel plastic coated metal hose has good flexibility, corrosion resistance, high temperature resistance, abrasion resistance, tensile strength, water resistance and provides some electromagnetic shielding performance.
Stainless steel plastic coated metal hose can be freely bent into a variety of angles and radii of curvature in all Hydraulic tube fittings have the same softness and durability; sections side buckle with a certain tensile strength, soft plastic bag to prevent cause damage to the internal pipe laying hose lines exposed.
Stainless steel plastic coated metal hose, light weight, good flexibility and strength of the connection with accessories, electrical properties and oil resistance, flame retardant, splash water, etc., are widely used in electric power, chemical industry, metallurgy, light industry, machinery and other industries.

2013年9月24日星期二

Metal pipe laying

Metal pipe laying :Dark metal tube set should meet the following requirements: embedded in the wall in the middle of the metal tube diameter should not exceed 50 floors in diameter preferably 15 ~ 20MM, 30 meters straight piping design dark box . Laid in concrete, cement inside Hydraulic ferrules metal tube, the foundation should be solid flat .Metal pipe connections, holes should be aligned , joints should be tight, can not penetrate the water and mud .Metal pipe should be not less than 0.1 % of the drainage slope .Buildings between the metal pipe laying depth of not less than 0.7 m ; laying on the sidewalk below , should not be less than 0.5 m .

Metal pipe connections

Metal pipe connections :Metallic tube connections should be firm, well-sealed , two ports should be aligned . A short sleeve or socket with a length of threaded Hydraulic hose fittings , not less than two times the outside diameter of the metal pipe . Copper pipe joints shall be securely connected to ensure a continuous electrical ground . Metallic tube connections should not be taken by way of direct butt . Metal tube into the junction box , the available tightening nut or threaded cap with fixed , exposed threaded tightening nut button 2 to 4 . Or the use of copper cups minister and comb knot to connect the metal pipe and junction box. But should ensure that the length of the junction box is exposed to less than 5MM.

Metal pipe bending

Metal pipe bending :In laying metal conduit should be to minimize the elbow , elbow each metal tube should not more than three , not more than two right angle bend , S bend should not occur , for larger cable cross-section allowed to have elbow , can be larger diameter pipe or additional cable box . Bending radius shall meet the following requirements: Ming Hydraulic tube fittings, generally not less than 6 times the tube diameter ; just a bend , from time to less than 4 times the diameter pipe ; whole row of steel pipe in the corner , should be bent into the shape of concentric circles . Ming piping, generally not less than six times the tube diameter , laid in the ground or inside the concrete floor , it should be not less than 10 times the tube diameter . Conduit bends should not wrinkle , depression and cracks , and the degree of bend flat tube diameter should not exceed 10% .

Metal pipe cutting threading

Metal pipe cutting threading :The pipe should be based on the actual needs of the length of the pipe to be cut . Use a hacksaw , pipe cutters or electric pipe cutting machine , do not use gas cutting .Pipes and pipe connections, pipe and junction boxes , wiring boxes connected to Hydraulic adapters both ends of the tube needs to threading . Sleeve silk silk panels or tubes used electric pipe threader machine . Complete sets of silk , it should immediately clean the nozzle, the nozzle end and the inner wall light burr file with a file , so that the nozzle remains smooth , to avoid breaking the cable sheath .

Dark metal pipe located on the following requirements of the construction

Dark metal tube construction located on the following requirements : 1. Metal pipe clamp fixed applications , the spacing between the support point should not exceed 3 meters. 0.3 meters away from the junction box office, the card will use the tube pipe fixed . In the elbow where both sides have fixed .
2 cable and cable with pipe laying, shall be within the pre- plastic -tube underground pipe . The cable laying pipe in the child , so that separate cables and cable laying , the outer diameter of the tubes should be 2.5 times the cable diameter . 3 When the weak and the strong electrical conduit pipes laid in parallel , you should try to keep a certain distance between the two to 13CM or so. 4, when the line specified with , the bending radius of not less than 6 times the tube diameter , when only one between two junction boxes is bent, the bending radius of not less than 4 times the pipe diameter . 5 horizontal vertical distribution lines laid out protection tube, its horizontal and vertical mounting tolerance of 1.5% , a total length of Dacron tube diameter deviation should not exceed 1 / 2.6 . Pipe should not be folded flat and cracks , the tube should be no iron and burrs , cutting off the mouth should be smooth, the nozzle should be smooth . 7 thin wire threaded pipe connections must be connected to the pipe threading length joint length of not less than 1/ 2 , should be added to both ends of the pipe joints across the ground wire ( not less than 4 mm2 copper wire ) 8 . concrete floors, walls and brick structures of the various information points concealed junction box and pipe connections shall be forced mother fixation. 9 Concealed inside the junction box with concrete requirements with wet cement paper or plastic foam filled inside , not the outside wrapped with cement . Embedded in the floor, walls inside the pipe , junction boxes should be fixed firmly to prevent displacement.
10 When conduit is connected directly to the device , the device should be laying pipe junction box ; when the pipe is connected indirectly with the device should be added wire protection hose or flexible metal protection tube ( metal hose ) connection ; optional Hydraulic tube fittings shall not use metal hose as grounding .11 galvanized steel or flexible metal wire protection tube jumper ground wire should be grounded using a dedicated line card jumper should not be used welding connection. Ming steel tube should be neat and fixed-point spacing should be uniform , steel pipe card should meet the maximum distance between the specification requirements : Pipe cards and terminals , elbows midpoint , electrical appliances or junction box ( box ) .
12 should be from the edge of 150-500 mm , the middle tube card maximum spacing : thick-walled steel pipe DN15-20 is 1.5 m , thin-walled steel pipe DN15-20 is 1.5 m , ceiling pipe should be laid out inside the pipe requirements of the construction .
13 pipe threading pipe before the water and debris should be cleaned , the wire in the tube may not have Hydraulic hose fittings, joints should be carried out in the terminal box , plastic should be added at the nozzle tip guard , different circuits , different voltage levels, AC and DC conductors shall not penetrate the same root canal .
14 tubing through the building expansion joints , expansion joints at both ends should remain grounded junction box and bolts.

Residential construction metal pipe laying

Site processing shall meet the following requirements: In order to prevent cable wear scratches cables, nozzle should be no thorns and sharp edges . To reduce the processing tube straight tube mouth when subsidence shear force on the cable , the mouth should be made ​​of metal pipe flare . After bending metal tube should not have cracks and obvious Hydraulic adapters phenomenon . If the degree of bending is too large, will reduce the effective diameter line pipe , causing difficulty in threading . Metal pipe bending radius of not less than the minimum allowed penetrate the cable bending radius . Galvanized pipe coated with zinc coating anticorrosive paint flaking Department should , in order to increase service life.1 . Metal tube processing requirements.2 . Metal pipe cutting threading : .3 . Metal pipe bending : . 4 . Metal pipe connections :5 . Metal pipe laying :
6 . Dark metal pipe located on the following requirements of the construction

Structure and properties of corrugated metal hose

Corrugated metal hose ( short hose ) is a modern industrial pipeline a high quality flexible pipe . It mainly consists of bellows, nets and joint components. Its inner tube is a spiral or annular waveform walled stainless steel bellows , bellows outer nets, is made of stainless steel wire or woven according to certain parameters . Hose Jic hydraulic fittings or flanges at both ends of the pipe joints with customers or flange mating .Bellows hose is made of very thin-walled stainless steel seamless or longitudinal weld precision plastic processing after forming . Because the elastic property of the bellows determine the contour hose has good flexibility and fatigue resistance , making it very easy to absorb deformation and cyclic loading various sports , especially in the piping system has the ability to compensate for a large amount of displacement . I plant in addition to the original hose sophisticated production equipment, recently introduced from Japan two high-precision , high-tech molded bellows automatic welding production lines, greatly improved the quality of the hose and the hose length is not produced limits , to meet the needs of long hose . Dawn brand hose nominal diameter range of DN4-800mm, length optional. Nets are installed in the pressure line hose main pressure parts , while the bellows from the sheath effect, according to the size of pipeline pressure and locations , you can select one or more layers of stainless steel wire or steel strip weaving, dawn brand hose pressure range is generally PN0.6-32.0Mpa. Up to 42.0MPa. The production of the main part of the material hose is the use of austenitic stainless steel , thus ensuring the hose excellent in heat resistance and corrosion resistance of the hose very wide temperature range , is -196-600 degrees to hose by pipelines through the media choose to apply corrosive stainless steel grades, the corrosion resistance of the hose can be guaranteed . Corrugated metal hose has good flexibility, fatigue resistance, high pressure, high temperature resistance, corrosion resistance , and many other features, it is relative to other hoses ( rubber, plastic hose ) much higher lifetime would therefore it also has a high overall economic efficiency . With the development of modern industry , for high temperature, high pressure hose corrugated metal demand is also getting bigger . Hose Scope: need fully flexible pipes, to prevent vibration premises piping for steam, gas , air, heavy oil, petroleum, chemical -pharmaceutical etc apply.

Metal hose applications industry

 Metal hose applications industry 1, metallurgical industry, metal hose is gradually transition to competition from product performance competitive cost performance, product structure in shape, the metal hose industry applications has been widely recognized.2, the petrochemical industry, the situation is relatively complex, on the one hand, large-diameter high-pressure hose and tank drain hose central market demand is growing, and new product development in the field of domestic far failed to put in place. On the other hand, some other occasion hose has appeared the phenomenon of alternative products such as dock appearing on the market with a non-metallic conduit tube (light weight, pressure fit). As the petrochemical industry is now the largest domestic market hose, various competitive in this field, input cost of new product development in this area is also larger.3, railway locomotive industries.Hydraulic pipe fittings As used by the Ministry of Railways information required on the form of a composite hose made ​​stereotypes provisions will not be great changes in the product mix in recent years, mainly manifested as price and service competition. But in the long term, the use of complex conditions, the uncertainty of the composite hose damage from abroad perspective of the development of the industry hose, metal hose being replaced is inevitable, so the product development is still far from over.4, shipbuilding industry, product testing by the Society in addition to need, but no special technical performance requirements, but according to foreign domestic data, its market demand is also huge.5, civil construction, irrigation installation and other industries, in addition to some of the stereotypes of the hose outside (such as plumbing, etc.), thick-walled tube instead of the trend of domestic elbow yet developed, according to Japanese data show that as much as their domestic water heater application prospects hose market.

Stainless steel pipes instead of water supply pipeline has become the trend of other materials

As more and more high buildings, high-rise buildings in the drinking water and fire water delivery systems have special requirements, the system must not only be able to withstand high pressure but also caused by the earthquake and the building of wind movement. Engineers are with stainless steel piping system meets these requirements. The world's newest and tallest 3 buildings (China Taiwan Province, Taipei Financial Center, Brisbane, Australia Oro Plata Building and Kuala Lumpur Petronas Twin Towers) is the best illustration of this to the high pressure stainless steel pipe Hydraulic tube fittings.In the past 25 years the German drinking water extraction, treatment and distribution systems made ​​of stainless steel has been growing widely recognized. Stainless steel tube is not only smooth luxury, look as new, and is widely recognized as a leading environmental health water supply pipes. The strength of austenitic stainless steel pipe carbon steel pipe 2 times, 4 times brass, PPR plastic pipe 8 times, is truly safe and reliable and can be done with the building with life green pipe. Another major use of stainless steel piping is - the life cycle cost of stainless steel components has obvious advantages, because the long-term infrastructure such as drinking water means the use of a stainless steel, you rarely need to be replaced.Although stainless steel drinking water systems in the world, the universal application will take some time, but in the engineering and economic aspects of stainless steel has the advantage over other alternative materials have shown that: instead of other materials with stainless steel pipe water pipe has become a trend.

Metal hose Application Performance

Closed metal hose has high acid and alkali, high temperature, flexible bend freely and specifications are complete, easy to install, maintenance free, long life characteristics. Applicable to any environment, various types of metal cutting machinery and equipment are applicable. Corrugated metal pipe is a modern industrial pipeline a high quality flexible connecting tube. It mainly consists of metal bellows, metal mesh and various different forms of joint components. It is a spiral-shaped corrugated inner tube or Hydraulic pipe fittings  annular corrugated thin-walled stainless steel bellows, bellows outer sleeve made ​​of stainless steel wire mesh or stainless steel woven according to certain parameters. Hose connectors at both ends of piping or equipment in accordance with the user's joint form prepared.Corrugated metal hose has good flexibility, fatigue resistance, high temperature resistance, corrosion resistance, and many other excellent features, it is relative to other types of hose (rubber hose, plastic hose) lifetime is much higher, with the the development of modern industry, resistant to high temperature, high pressure, corrosion-resistant corrugated metal hose is increasingly widely used. Gas stove with gas vent pipe connections, use that is resistant to corrosion, oxidation of the metal hose. Metal hose with threaded connection as long as the stove is connected, you can use the seal will not install due to human causes leaks, and ease of installation.

Special features of the metal hose

Metal hose is an important engineering technology connecting member by corrugated flexible tube, a combination of nets and fittings. In a variety of gas, fluid piping systems as well as length, temperature, position and angle compensation systems as compensation components, sealing elements, connecting elements and a damping element, used in aerospace, petrochemical, mining, electronic, mechanical shipbuilding, medical health, textile electronics, energy and construction fields.Austenitic stainless steel metal hose material or materials required by the user, with excellent flexibility, corrosion resistance, high temperature resistance (-235 ℃ ~ +450 ℃), high pressure resistance (up to 32MPa), the tube path can be connected in any direction, for temperature compensation, and absorb vibration and reduce noise, change the medium conveying direction, remove pipe or between pipes and the mechanical displacement devices, double flange metal corrugated hose to a displacement, vibration a variety of pumps, valves and other flexible joints is particularly Hydraulic ferrules.Hose metal hose is installed in the pressure line of the main pressure parts, while the bellows from the sheath effect, according to the size of pipeline pressure and locations, you can select one or more layers of stainless steel wire or steel for weaving, hose pressure range is generally PN0.6-32.0Mpa. Up to 42.0MPa. The production of the main part of the material hose is the use of austenitic stainless steel, thus ensuring the hose excellent in heat resistance and corrosion resistance of the hose very wide temperature range, is -196-600 degrees to hose by pipelines through the media choose to apply corrosive stainless steel grades, the corrosion resistance of the hose can be guaranteed. Corrugated metal hose has good flexibility, fatigue resistance, high pressure, high temperature resistance, corrosion resistance, and many other features, it is relative to other hoses (rubber, plastic hose) much higher lifetime would therefore it also has a high overall economic efficiency. With the development of modern industry, for high temperature, high pressure hose corrugated metal demand is also getting bigger. Hose Scope: need fully flexible pipes, to prevent vibration premises piping for steam, gas, air, heavy oil, petroleum, chemical-pharmaceutical etc apply.

Metal hose pavement construction requirements

Metal hose construction, the use of sub-construction method, previously used in the original arch culvert base angle side by side two, the length determined based on long culvert. Culvert advance for the rails, corrugated culvert pipe diameter according to project needs may have different specifications, ready to pipe diameter of 0.5m - 2.5m; each section of pipe length 3 meters. Using internal (external) flange bolts. Assembled pipe diameter of 3m - 8m. Each circumferential direction 4 --- 15 plates, lap board and the board strength bolts tightened. If Han longer than 30 meters, the corrugated culvert culvert sides of the original width of less than 80cm, length 3m-6m may be downstream or upstream culvert advance toward the one end, in place later, it can be fixed to the top of the sheet rock masonry end wall, the other end of the corrugated culvert culvert with sandbags or the distance between the mortar and stone block, width 50cm, then start filling. Both sides of the law can be dense or coarse watertight concrete pouring Vibes tamping; top with high-pressure pumping expansive cement mortar. This section tube four weeks after they have finished filling the second pipe shipped to carry two connections, corrugated culvert pipe are connected to the inner flange bolting, workers in the pipe connection. After connecting to the same method as backfill. In this order, to complete the construction of the entire road corrugated culvert work. Metal hose adapter, according to the selection of electrical equipment into the cable connector metal hoses and metal hose fittings, metal Hydraulic hose fittings according to the size of the transition metal hose connector panel mounted connector and metal hose, so that the whole system is naturally smooth; transition joints can either press the need to produce at the construction site can also be mass-produced in the factory according to standard parts, with the use of promotional value; cable can extend the life of the cable to be effective in preventing injury leakage and other external forces generated security incidents.

The role is a hose

Metal hose used for automated meter signal wire protection tube and instrument protection tube. Instrument for the protection circuit, protecting precision optical ruler to protect the sensing lines Hydraulic tube fittings stainless steel hose, metal hose electrical protection; stainless steel hose, good softness, dustproof, waterproof, anti-oil, anti-rust; abrasion resistance, and provide some shielding effect.The sensing for precision optical ruler line protection, industrial sensor circuit protection. Has good flexibility, corrosion resistance, high temperature resistance, abrasion resistance, tensile strength.

2013年9月22日星期日

Hose connector ferrule Precautions

Sleeve type hose connector has a simple structure , easy to use and do not have the advantages of welding . But in the high-pressure hydraulic system, if the improper operation will often cause leakage , affecting its widely used. After years of practice I summed up some experience , and achieved good results. Card sets of pipe joints mainly by a 24 degree taper hole connector body 1, with a sharp inner edge of the card sets 2 and play the role of compression nut 3 compression of three parts . Tighten the nuts 3:00 , lined butterfly valve ferrule 2 is advanced 24 degree taper hole and subsequently deformed, so that the card with the connector body cone sleeve forming spherical contact seal ; Meanwhile , the card edge embedded steel inner sleeve 4 the outer wall of the outer wall of the pressure out a ring groove , which play the role of a reliable seal . The best choice for stress relief annealing steel pipe 20 # fine extubation , it is a good card kit blade embedded in the outer surface of steel pipes , play a reliable seal.( 1 ) pre-① hose connector ferrule is the most important part of the pre-installed , directly affects the reliability of the seal . Generally require a dedicated preloader . Small diameter connector can be pre-installed in a vise . In practice, as the parent with a joint body , the nut , ferrule can be pressed onto the tube . There are card sets straight couplings , sleeve type end through turn heads, ferrule Hydraulic pipe fittings  and other types . I found that even with the same manufacturer 's batch of goods , these types of joint body tapered hole depth is often not the same , the result is caused by a leak , and this problem is often overlooked. The correct approach should be, what kind of pipe end connector body connection , the corresponding connection terminal is preloaded with the same type of connector , so to avoid possible leakage problems .② pipe end should be flush . After sawing the pipe should be flush grinding wheel and other tools , and deburring , cleaning with high-pressure air to blow before use.③ pre-installed , you should try to keep the tube and the coaxial connector body , if the pipe deflection is too large will cause seal failure.④ preloaded force should not be too large. Should make the inner edge ferrule tube wall just embedding , card sets there should be no significant deformation . During pipeline connection, then the provisions of the tightening force assembled . φ6-10mm ferrule tightening force of 64-115N, φ16mmr 259N, φ18mm for 450N. If the pre- deformed when the card holder will lose the seal.( 2 ) prohibits adding sealant filler. It was sealed in order to achieve better results, apply sealant put on the card , the results sealant being washed into the hydraulic system , causing the hydraulic components orifice blockage failures.( 3 ) when the connecting pipe , the pipe should have a sufficient margin deformation , to avoid the tube subjected to tensile stresses.( 4 ) connecting pipe should avoid subjecting it to lateral forces , lateral forces caused Mifengbuyan over the General Assembly .( 5 ) When connecting tubes , one should bear in good, avoid multiple disassemble , otherwise it will seal performance deteriorated.

Metal hose connector structure and properties of introduction

Metal hose connector is a modern industrial pipeline a high quality flexible connecting tube . It mainly consists of metal hose , metal mesh and various different forms of joint components. It is a spiral -shaped corrugated inner tube or annular corrugated thin-walled stainless steel bellows , bellows outer sleeve made ​​of stainless steel wire mesh or stainless steel woven according to certain parameters . Hose connectors at both ends of piping or equipment in accordance with the user 's joint form prepared . Hydraulic hose fittings Bellows hose is made of stainless steel seamless or longitudinally welded stainless steel thin walled tube through precision molded plastic deformation . Bellows hose contour determines the elasticity of softness and fatigue resistance , easy to absorb all kinds of sports deformation and cyclic loading , especially to meet the system larger displacement compensation . Metal hose has good flexibility , fatigue resistance , high temperature resistance, corrosion resistance , and many other excellent features, it is relative to other types of hose ( rubber hose , plastic hose ) lifetime is much higher, as development of modern industry , resistant to high temperature , high pressure , corrosion-resistant corrugated metal hose is increasingly widely used.Line pipe , black, galvanized iron pipes ( water , gas pipes ) ;

Sleeve type metal connector structure and characteristics

Sleeve type metal connector structure and characteristics:DKJ card sets metal hose connector , can non-threaded steel pipe and hose connections , save the threading process , you can simply screw into ;Metal joints made ​​of zinc alloy die-casting , zinc plated , brushed , or chrome ; compact structure , high strength. Steel and metal hose Hydraulic tube fittings  connection , reliable, attractive appearance ;This metal connector for the card sets, metal hose is used to connect to non- threaded pipe above ;Metal hose adapter : JS type , JSH type , JSB type , JSHG type ;Adapter Pipe : thin steel wire tube , black, galvanized iron pipes ( water , gas pipes ) ;Use metal connector DKJ card sets , please note the connection pipe hose specifications, dimensions .

Male hose connector termination metal structure and characteristics

Male hose connector termination metal structure and characteristics:DPJ externally threaded metal hose connector termination is JB/GQ0552-83 D95-5 metal connectors of extension products;Metal joints made ​​of zinc alloy die-casting, zinc plated, brushed, or chrome; compact, non-porous, high strength. Reliable connection with metal hose, aesthetic Hydraulic hose fittings appearance;This termination type metal connector is used to connect the metal hose on the straight line connecting the cabinet member;Metal hose adapter: JS type, JSH type, JSB type, JSHG type;
Recommended use imperial or metric threaded metal hose connector metal joints;
Can be customized non-standard metal hose fittings, special metal fittings

Since the structure of the solid metal hose fittings and features

Since the structure of the solid metal hose Hydraulic tube fittings  and features:DGJ from the solid metal hose connector, can no threaded pipe or non-threaded device outlet with hose connection, save the threading process;JINGSHENGFLEX metal joints made ​​of zinc alloy die-casting, zinc plated, brushed, or chrome; compact structure, high strength. Steel and metal hose connection, reliable, attractive appearance;This is self-fixed metal joints, metal hose is used to connect to non-threaded or non-threaded pipe outlet on the device;Metal hose adapter: JS type, JSH type, JSB type, JSHG type; Adapter Pipe: thin steel wire tube, black, galvanized iron pipes (water, gas pipes);DGJ selection from the solid metal hose connector hose pipe connection, please note that the specifications, dimensions.

The use of hose fittings classification

By the use of hose fittings can be divided into: external thread termination hose fittings, hose ferrule fittings, hose  Hydraulic hose fittings  from solid. Termination hose connector external thread with a zinc alloy die casting, zinc plated, brushed, or chrome; compact, non-porous, high strength. Card sets of pipe joints can unthreaded pipe and hose connections, save the threading process, you can simply screw into; compact structure, high strength. Since the solid-type pipe joints can unthreaded pipe or non-threaded device outlet with hose connection, save the threading process; made ​​of zinc alloy die-casting, zinc plated, brushed, or chrome; compact, strength high. Widely used in high-end buildings, hotels, hospitals, buildings, stadiums, museums, relevant units, villas, high-end residential

Male hose connector termination metal structure and characteristics

Male hose connector termination metal structure and characteristics:External thread termination metal hose connector is JB/GQ0552-83 D95-5 metal connector extension products;Metal joints made Hydraulic ferrules zinc alloy die-casting, zinc plated, brushed, or chrome; compact, non-porous, high strength. Reliable connection with metal hose, aesthetic appearance;This termination type metal connector is used to connect the metal hose on the straight line connecting the cabinet member;Metal hose adapter: JS type, JSH type, JSB type, JSHG type;Recommended use imperial or metric threaded metal hose connector metal joints;Can be customized non-standard metal hose joints and special metal joints.

Hoses Category Overview

Hose mainly divided into: stainless steel hose, metal hose, corrugated hose, plastic hoseCorrosion resistance of stainless steel hose depends on the chromium content, if the amount of chromium added to 10.5%, the atmospheric corrosion resistance of steel significantly increased, but the higher chromium content, while still being improved corrosion resistance, but obvious. The reason is of steel with a chromium alloying treatment, Hydraulic hose fittings  change in the type of surface oxide became similar to pure chromium metal oxide formed on the surface.This tight adhesion of chromium-rich oxide protective surface to prevent further oxidation of this thin oxide layer, through which you can see the surface of the natural luster of stainless steel, the stainless steel has a unique surface. Moreover, if the surface is damaged, the exposed steel surface and atmospheric reactions will self repair, re-formation of this kind of "passive film" and continue to play a protective role

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Classification of metal hose connector

Classification of metal hose Hydraulic ferrules  hose, high pressure ball valves, intentions odd quick connector ferrule fittings, welded pipe fittings, high pressure hoses. Transition fittings, ferrule fittings, tee pipe fittings, non-standard pipe fittings, flare fittings, angled fittings, rotary tube fittings, quick connectors, stainless steel pipe fittings, copper fittings.

Metal hose connector construction and performance overview

Metal hose connector is a modern industrial pipeline a high quality flexible connecting tube. It mainly consists of metal hose, metal mesh and various different forms of joint components. It is a spiral-shaped corrugated inner tube or annular corrugated thin-walled stainless steel bellows, bellows outer sleeve made ​​of stainless steel wire mesh or stainless Hydraulic tube fittings steel woven according to certain parameters. Hose connectors at both ends of piping or equipment in accordance with the user's joint form prepared. Bellows hose is made of stainless steel seamless or longitudinally welded stainless steel thin walled tube through precision molded plastic deformation. Bellows hose contour determines the elasticity of softness and fatigue resistance, easy to absorb all kinds of sports deformation and cyclic loading, especially to meet the system larger displacement compensation. Metal hose has good flexibility, fatigue resistance, high temperature resistance, corrosion resistance, and many other excellent features, it is relative to other types of hose (rubber hose, plastic hose) lifetime is much higher, as development of modern industry, resistant to high temperature, high pressure, corrosion-resistant corrugated metal hose is increasingly widely used.

How to select quick connector

How to select quick connector?1, the type of fluid, temperature (see selected for the type of fluid, the temperature of the body material and the sealing material of the quick connector)The fluid, for the body material, the sealing material is different. For example, the quick connector is air. Recommended steel, is the water you choose brass or stainless steel.2, the liquid pressure (see pressure selected for the performance of the fluid pressure quick connector)Fluid pressure is also quick connector selected key.Hydraulic pipe fittings  quick coupler is used 5.0Mpa (51kgf/cm ²)-68.6Mpa (700kgf/cm ²) is formed between the series, corresponding to the pressure characteristics of quick connector configuration is different.
3, automatic switch valve structure (please select appropriate use of the valve structure pipe quick connector) For the valve structure, there are two-way switch type, one-way and two-way switching open. Since the two-way switch in addition to the separation type other than a fluid flow from the piping. So please be careful.4, quick hose connector use of the environment (Please select suitable environment construction, materials, quick connector) Combined with environmental conditions of humidity and dust conditions, and easy to use environment corrosion to consider the type of the selected quick connector, bulk materials, sealing materials.5, the installation of the shape, size (in determining the final shape and size after ordering products) Make sure the quick connector type and material, and specify the corresponding properties in the assembly of piping shapes and sizes. Note that the size of the fluid flow associated

Metal hose connector overview

Metal joints made ​​of zinc alloy die-casting, zinc plated, brushed, or chrome; compact, non-porous, high strength. Reliable connection with metal hose, aesthetic appearance;Metal connectors for Hydraulic tube fittings  termination type, metal hose connected to the box on the straight line connecting pieces;Metal hose adapter: JS type, JSH type, JSB type, JSHG type;Recommended use imperial or metric threaded metal hose connector metal joints;Can be customized non-standard metal hose joints and special metal joints.

The composition and properties of the hose

Bellows hose is made of stainless steel seamless or longitudinally welded stainless steel thin walled tube through precision molded plastic deformation. Bellows hose contour determines the elasticity of softness and fatigue resistance, easy to absorb all kinds of  Hydraulic pipe fittingssports deformation and cyclic loading, especially to meet the system larger displacement compensation. Corrugated metal hose has good flexibility, fatigue resistance, high temperature resistance, corrosion resistance, and many other excellent features, it is relative to other types of hose (rubber hose, plastic hose) lifetime is much higher, with the the development of modern industry, resistant to high temperature, high pressure, corrosion-resistant corrugated metal hose connector is increasingly widely used.

2013年9月17日星期二

Metal hose structure

Nets are installed in the pressure line hose main pressure parts, while the bellows from the sheath effect, according to the size of pipeline pressure and locations, you can select one or more layers of stainless steel wire or steel strip weaving, dawn brand hose pressure range is generally PN0.6-32.0Mpa. It mainly consists of bellows, nets and joint Hydraulic tube fittings . Hose combined range: need fully flexible pipes, to prevent vibration premises piping for steam, gas, air, heavy oil, petroleum, chemical-pharmaceutical etc combined. Its inner tube is a spiral or annular waveform walled stainless steel bellows, bellows outer nets, is made of stainless steel wire or woven according to certain parameters.
Metal hose (short hose) is a modern industrial pipeline a high quality flexible pipe.Because the production of the main part of the material hose is the use of austenitic stainless steel, thus ensuring the hose excellent in heat resistance and corrosion resistance of the hose very wide temperature range, is -196-600 degrees to hose by pipelines through the medium aggressive combination of stainless steel grade selection, you can ensure that the corrosion resistance of the hose.

Metal hose fittings in the petrochemical industry in the specific application

Metal bellows hose is a core component of the transport pipe fittings of various fluids . Metal hose fittings nature of their work is in the pipeline and the pipeline , piping and equipment, Hydraulic tube fittings  connection between the device and the device connected to the role play . No matter what kind of flexible element bellows structure , have the following effects:
1 , the installation displacement deviation compensation , especially in the low range angular displacement compensation ;
2 can be carried out within the scope of the displacement of entire frequency attenuation compensation ;
3, will be transmitted to the engine exhaust system load for support in order to reduce the muffler by the impact ;
4 , isolate the vibration generator passed further realization of the exhaust system noise and vibration ;
5 of purification has slowed the impact of the role to be protected ;
6 , due to high temperature caused by the change in the exhaust branch pipe size , the flexible element may be thermally compensated .
1 , metal hose in the petrochemical storage tanks
1 ) , tank seismic metal hose connector is mainly used in tanks and pipeline export soft connection , compensation tank foundations drop tank system expansion and contraction , the construction of misalignment as well as in an earthquake avoid cans body and pipeline damage caused by secondary catastrophe.
2 ) , center of the floating roof tank drain metal hoses, floating on top of the tank to exclude rain, snow and other Hydraulic pipe fittings Hydraulic pipe fittings  debris, instead of the original swivel folding center inlet pipes and drain hose .
2 , metal hose used in petrochemical wharf
1 ) , vacuum jacketed hose can effectively solve the low transmission medium.
2 ) , a fixed bridge used in long-distance pipeline metal hose , the main pipeline of expansion and contraction is compensated , the compensation fixed pier and shore -side ground subsidence and construction and installation bias.
3 ) , the fixed and mobile Approach Approach , the current approach bridge and barge mounted between metal hose , to effectively compensate for the river ( sea ) surface displacement caused by fluctuations and river ( sea ) waves caused by barge to move.
4 ) , chemical tankers and other transport vessels between the pier as a soft metal hose connector to connect .
3 , metal hose pipe used in chemical equipment
Stainless steel metal hose resistant to corrosion, high temperature , etc. are widely used in chemical equipment
4 , metal hose filling system used in transport
Metal hose connector as trains, cars filling the oil tank or other liquid handling devices soft connection . It has a tube soft , small bending radius, torsional resistance, long life, safe and reliable.

Metal hose coupling to the environment and related functions

A fluid type, temperature (please select suitable type of fluid, the temperature of the body material and sealing material quick coupling) of the fluid, the appropriate body material, the sealing material is different, for example, air quick connector is recommended iron or steel water, then choose the brass or stainless steel2 automatic switch valve structure (please select suitable piping uses quick coupling valve structure) for Hydraulic adapters  valve structure, there are two-way switch type, one-way and two-way switching open. So please pay attention. Because in addition to the separation than two-way switch type, a fluid flowing out from the pipe3 quick connector use of the environment (Please select suitable environment structure, material quick connector) combined with ambient humidity conditions, dust conditions, and easy to use environment, corrosion, etc., to consider the type of the selected quick connector, bulk material , seal material Metal hose connector output functions related features introduced: Bolts, nuts and other solids conveying, handling and a conductive feature. Connectivity: fishing rods, fasteners Pocket CD's, mobile connectivity and homework purposes other than fluid. Exchange functions: pneumatic, hydraulic tools, cylinders, hydraulic cylinders, metal mold related machinery attachments. Home for the function: computer cooling device, cylinder casting machine maintenance.

Rotary Joint Maintenance

Rotary Joint Maintenance:1 , should be kept inside the drum and pipe cleaning . Special attention should be on the new equipment , if necessary, take the filter in order to avoid foreign bodies caused by abnormal wear rotary joint .
2 , because the machine will lead to long-term use internal scaling and rotating joints from rust , please note that there Hydraulic adapters will be such as re-use drip stuck or situations from occurring.3 , with periodic oiling oiling device , please ensure that the bearing operation reliability.4, the flow of heat medium rotary joint body should be gradually born temperature to avoid thermal shock .5 , check the wear condition of the sealing surface and the thickness variation ( normal wear and tear of 5 - 10mm); observe the sealing surface of the friction track and see whether there is intermittent or three scratches and other issues, if any, on the case of conditions, should replaced immediately.

Rotary joint installation should pay attention to what matters

Rotary joint installation should pay attention to what matters?
1, the rotary joint in the handling and storage process should avoid bumps and drops, to avoid damage to the interface and internal parts.
2, concentric installed as to ensure the smooth functioning of the rotary joint.
3, swivel threaded connections during  Hydraulic ferrules installation, you should pay attention to the inner and outer tube is threaded to correspond to the direction of rotation of the drum, and the inner and outer tubes screwed to it should be consistent.
4, the rotary joint and pipeline connection between the hose must be connected (we recommend the use of scrambling and good company metal hose), the absolute prohibition of rigid connection.
5, the rotary joint as directly as possible with the entrance hose. To relieve joint auxiliary weight and prolong life.
6, the inner tube assembly, with attention to the size and weight of the auxiliary support. Internal rotation of the rotary joint with the inner tube and fitting tolerances recommended H8/e7 fit.
7, the rotary joint rotation stopper should be properly supported and generally lever detent hole diameter should be smaller than 2mm, so as not to affect the freedom of swivel adjustment and compensation.
Connected to the device for rotating the joints of the various connections (customer specific configuration of the device according to set various types of connections)

How metal fittings installation

Although compressible metal hose can stretch, but if you do not install the correct position, it will soon break, reduce the service life.Hoses can be mounted horizontally, vertically or diagonally also be installed, the ideal state is mounted vertically, and should be avoided in the vicinity of the wheel when necessary to install the bezel. GenerallyJic hydraulic fittings can be divided into three kinds of the metal hose length: 1 species is compressed length, i.e. the hose is compressed to the length of the limit position; No. 2 is installed length, which is the maximum displacement amount in an intermediate position half length of the hose; No. 3 is stretching the length of the hose is stretched to the maximum length limit. Hose should be installed in the middle position of the hose, the so-called installation lengths. In this position, the mounted state, when the axial load of the hose can have two moving directions, or if only the one direction, will affect the strength of the metal hose, reduce the service life.
In the actual installation process, taking into account the results by using a ruler to the amount of hose length for installation may affect production efficiency, some foreign manufacturers ruler mounted directly on the hose, cut off after the installation of a ruler.

Q-type series rotary metal pipe joints for medium

For water, steam, hot oil medium; Maximum speed: 100RPM; maximum pressure: 2.0Mpa. Normal maximum temperature: 220 ℃; high temperature Maximum temperature: 250 ℃. Dual sphere unbalanced structure, Hydraulic pipe fittings  without requiring equipment concentricity, can automatically adjust the concentricity. When the medium flows through the sealing ring and oil-bearing, the formation of a thin liquid film, enhanced sealing and lubrication, thus reducing wear and extended service life (shelf life of 180 days of the product).
   Directly connected to the outer tube rollers or the dryer, as the main rotating parts; precision machined spherical outer tube, bottom bottom plane and spherical graphite impregnated with sealing rings, together constitute a reliable dynamic seal friction

Attention to the proper use of hose life safety

Residents use gas facilities tend to ignore some of the ancillary equipment such as valves, hoses , stove inspection , these are ignored by the device is likely to become invisible killer for gas safety lay hidden.I recently learned from the gas company Gas repair center that, in the first half of the police repair center 298, as bottled liquefied petroleum  Hydraulic tube fittings  to provide relief . Among them, the user valve leakage, no washers , gaskets leak 88 onwards, users hose leaks, blocked 63 onwards . Some residents of the stove has exceeded the state's retirement period , which is also a lot of potential safety problems .Home reducing valve leak occurred later due to gas accidents . A household gas leak found in the home , close the valve immediately after the alarm . Gas 110 onsite inspection, found that the gas valve out of the user's problem . Fortunately discovered in time , did not lead to disaster.Poisoning occurred in the past , more than 60% of the explosion is due to valve or rubber seals without Shanghao loss, damage caused . Therefore, the proper use of pressure reducing valve is very important.Metal hose connectors that install pressure reducing valve when the first note on the positive, good threaded on , then press the Left-hand direction ( counterclockwise ) rotation of the handwheel . Valve inlet side of the rubber seals are used to prevent leakage of an important component of each replacement of LPG cylinders should be checked that the seal is intact , if deformed or damaged, must be replaced.In  Hydraulic pipe fittings addition to reducing valve, gas hose is also an important component of the device . A household alarm call home has a very strong smell of gas , close the valve , the taste is not a long time to disperse . Gas 110 Alarm onsite inspection and found serious aging skin tube , gas leaking from the cracks constantly , also found that there are mild valve leakage . It is assumed that the user's skin tube with at least five years.
Metal hose connector to tell you , non-metallic materials LPG hose life is generally two years , a long time easy to aging and even cracking, easy to produce gas leakage and other safety hazards , so regular inspection and replacement, replacement of at least two years once. Non-metallic materials middle of hose may not have the interface , not through walls , windows and doors . Because rubber hose safety factor is low, some of our cities have banned the sale of ordinary hose to impose higher safety factor used metal hose . The price of the metal hose rubber hose slightly more expensive than the average , but the security and reliability are increased .In addition , the use of embedded gas stove stove users must be careful to check whether with automatic flame failure protection devices, and pay attention to life . Flameout protection device with automatic gas stove burner flames are accidentally extinguished in the case of flameout protection device can promptly cut off the gas supply , thereby avoiding gas leak dangerous. Of the embedded gas stove automatic flame failure protection function has been a mandatory requirement, but there are still some manufacturers of products not up to standard . When residents in the purchase carefully screened stove , do not buy flameout protection device with automatic stove . For eight years have passed , " Doomsday" The stove should be replaced as soon as possible .

Rotary joint installation and maintenance methods include

Rotary joint installation and maintenance methods include:1 , the rotary metal joints during handling and installation process should avoid collision or fall, or easy to produce internal parts rupture ;2, in order to avoid scratches and seal ring damage internal components and cause unnecessary downtime and maintenance , in addition to the net should be installed before fitting pipes, rollers , cylinders or cylinder all the core sand , dust , welding slag, metal debris and other foreign matter . Should pay particular attention to the new equipment , if necessary, to be added over slipping through the net ;3, try concentric installed , installed after the entire rotating metal joints within the allowable range of a free state , otherwise Hydraulic pipe fittings joints during operation causes the sealing ring when shaken by the non- normal wear and tear ;4 , due to the rotation metal joints sealing surface friction pair during operation will create friction torque must be loaded detent holes on rotation stopper lever to eliminate , avoid metal hose prematurely due to power failure , but not suitable for transfer and supporting points assembly tight, generally rod diameter smaller than the detent hole 2mm, so as not to affect the freedom of rotating metal joints regulation and compensation ;5, the inner pipe must be straight and accurate to ensure that when the roller rotates without wobble , so to avoid damage to the inner member joint leakage or rupture of the graphite seal ring ;6 , rotating metal connector applications stainless steel hose and pipe connections , and metal hose should be of sufficient length , not tension or compression leaving the roller rotating metal joints deviate from the centerline movement of the metal hose installed can be used for slight shaking hands better . Metal hose as directly as possible with the rotating metal connector connected to minimize the use of pipeline accessories , to prevent adding weight to affect the use of performance rotary metal joints , metal hose connected to cope with pipes and accessories to provide appropriate support ;7 , during the operation of the rotating metal joints , without providing it with a lubricant , but in the case of medium barrier to avoid rotating metal connectors run in the dry state , otherwise it will cause carbon - graphite seal ring excessive wear ;8, the removal of the replacement seal ring to Hydraulic hose fittings  protect the parts , especially the sealing surface , do not crash , scratches, enter the foreign body.9 , because the machine is not used for long metal joints can cause internalrotation and scaling from rust , please note that the re-use may be stuck or drip situation occurred .10 , the rotation of circulating medium heat metal connector body should be gradually warming up, to avoid abrupt changes in temperature .11 , as in the course of a leak , you should immediately stop using and prepare maintenance , does not allow to work sick , so as not to damage other components.

Difficult to distinguish the pros and cons of hose fittings Appearance

According hardware products quality inspection center of the king's work , at present many companies in pursuit of profit , reduce costs, reduce the product 's material , the use of obsolete iron ( easy to rust ) , zinc alloy ( without preservative ) and other soft metal as a raw material  Hydraulic tube fittings production, resulting in product quality problems. It is understood , fittings and hose quality tests, material, thickness and other issues resulting metal hose coupling strength properties and confined performance not up to standard , this should cause the user's attention .

Metal hose connector quality gap identification method

Because metal hose fittings on the market caused by different internal materials of varying quality, difficult for consumers to distinguish from the appearance of the merits of joints . In the end what causes joint fracture ? Avoid accidents that joint attention to what ? Once the issue should be how to forensics ? Channels through which to protect their rights? Identify quality standards of evidence according to understand , to distinguish the source of the problem joint fracture is also more difficult. Currently, the National Technology Quality Supervision Bureau released the seal faucets and hoses standard recommendations , compare these two criteria perfectly fitting and hose on the quality standard indicators were provided . Consumers can go to the inspection department of the joint efforts and twist the hose connector valve tightness , the joint strength of the material for testing. If you can not reach the standard requirement, belongs to quality problems, can serve as strong evidence for prosecution . Use and maintenance can not be ignored at home prolonged use metal hose Hydraulic pipe fittings generally do not cause people to care, but the use of too frequent and improper maintenance , but also to some extent to the joint fracture potential problems. It is understood that the general life of joints 20 million times, should be replaced after prolonged use . When using them , you should pay attention to try light off light on, do not vigorously and repeatedly rotating hose connector knob.

Metal joints

Used in a variety of connectors on the car. These Hydraulic tube fittings are made ​​from steel or lead quality, and surface paint, to avoid rust rot. Generally use special seals joints, because the protective order to seal joints only afraid of vibration, and reliable sealing. When installing fittings, rubber seal ring must use fluoride-resistant rubber ring; and fitted with rubber ring, which must be the same size and connector specifications, and the surface needs to apply refrigeration oil. When tightening the nut, the joint can not move, gently tighten with a wrench, but not too tight, otherwise it will cause leakage.

Metal hose joint structure and characteristics

Metal hose joint structure and characteristics:DKJ card sets metal hose connector, can non-threaded steel pipe and hose connections, save the threading process, you can simply screw into;Metal joints made ​​of zinc alloy die-casting, zinc plated, brushed, or chrome; compact  Hydraulic hose fittings , high strength. Steel and metal hose connection, reliable, attractive appearance;This metal connector for the card sets, metal hose is used to connect tonon-threaded pipe above;
Metal hose adapter: JS type, JSH type, JSB type, JSHG type;Adapter Pipe: thin steel wire tube, black, galvanized iron pipes (water, gas pipes);
Use metal connector DKJ card sets, please note that the hose connection pipe specifications, dimensions

2013年9月16日星期一

High pressure hose and fittings assembly withhold the amount and mode selection improperly withheld

High pressure hose and fittings assembly and withhold the amount of the withholding way inappropriate choice. Or joint structure, material, size selection is unreasonable, can lead to pressure hose and fittings too tight or too loose, causing early damage joints. Assembly, if the withholding amount is too small, that withhold joints between the weight of too loose with the hose when under the effect of Hydraulic pipe fittings Hydraulic pipe fittings hose during the initial period there may emerge from the joint; withheld if excessive, then withhold joints and hose too tight, easily lead to the hose inner layer of localized damage, deformation, cracks, high pressure oil from the weak rupture directly into the layer of wires, and then he went along the gap between the wire coat tail ejected, or along the wires of the layer has been somewhere he went to build up, so that the outer plastic drum kits produced even rupture. Hose and connectors in the assembly, if the withholding too fast, easy to cause damage to the inner rubber layer and wire breakage, so that premature failure of the hose in use. In addition, the joint design is unreasonable, jerry, processing of poor quality, can also cause damage to the inner glue; if improperly fitting material selection, not reach high pressure hose assembly requirements. Will shorten the life of high pressure hose.

Hydraulic oil (liquid) on the performance of the seal

Seal theory: in a dynamic and flexible seal between mating surfaces a layer of lubricating film intact. In the normal state, the lubricating film is the use of this layer to achieve the purpose of sealing and extending seal life.In the hydraulic system, the hydraulic oil (fluid) of the sealing performance of the sealing member in addition to media / sealing material compatibility, viscosity of the oil, the viscosity change with temperature, reciprocating (rotational) movement velocity, pressure, and the shaft, cylinder or the rod of material, hardness, geometry, surface finish, and the impact of the seal structure of the lubricating film and the film forming characteristics of the factors that affect the sealing effect. In general, to form a continuous lubricating film can achieve the desired sealing effect.Explain the seal of the sealing principle. That the seal (rotating dynamic seal) sealing machine, and sealing principle reason lubrication characteristics of two parts. Lubrication: oil seal friction characteristics are affected by the viscosity of the fluid and the sliding speed control, the relative sliding of the shaft seal surfaces separated lubrication oil film of moving, so keeping friction, wear small. Sealing principle: the sliding contact surface of the seal oil flow from the atmosphere side to the oil side and from the oil side to the atmosphere side of the loop. The sliding surface lubrication, prevent wear and tear, thus there is no leakage. When moving speed is too high, the impact of a continuous lubricating film formation, resulting in frictional heat increases  Hydraulic hose fittings temperature range beyond the seal material is caused by damage to the seal. Pressure is too large, in addition to affecting film formation, but also on the rubber seals have a "squeeze gap" effect, generally can be added, "ring" to improve. Or select a low coefficient of friction, good self-lubricating PTFE seals portfolio structure will help to improve the lubrication between the friction, suitable for high speed and high Depending on the system environment, working conditions and a reasonable selection of media seals and sealing materials, proper installation and maintenance of seals, is to obtain effective sealing effect, reliability and service life of the key.

A new hydraulic fittings and problems to improve

New rapid fittings, its advantages are: easy accessibility, connections are secure , reliable sealing, small size . However, the process used in the field , there are individual problems , especially for the following description and analysis. 2 connector and pipe fittings Figure 1 shows the structure of the connecting pipe is not turned on their structure diagram . The overall structure of the pipe for the connection , the overall structure of the outer pipe fittings threaded connection via a fixed piping ,  Hydraulic pipe fittings  core 16 may be sliding around inside the outer tube is not connected to connector pin 16 under the action of the spring 3 ports sealed. Core structure diagram for the pipe joints for pipe outer tube structure diagram . 6 can move around in the jacket , from the reduction of the role of the ball , and stretch or compress the spring 7 ; ball 5 off when you connect a groove on the outer tube and the tube fittings securely attached ; retaining ring 4 restrictions Jacket the maximum protrusion amount ; outer tube 13 is threadedly connected and fixed to the joint core 11 ; fitting and piping connected to the fixed core 11 does not move ; inner sleeve 14 can be moved around , while the spring extension or compression,

A new hydraulic fittings and problems to improve

1 Introduction tubing and tubing fittings are , tubing and hydraulic components between the removable connector . Many different types of fittings , press fittings and tubing connections can be divided into flaring , welded , card sets ( bolts tight ) and so on. With the continuous development of hydraulic technology , people on  Hydraulic tube fittings lines and fittings have become increasingly demanding , specific requirements are: easy accessibility, connections are secure , reliable sealing, small size, through the oil capacity , pressure loss and technology is good and so on. Currently, almost no one pipe joint to fully meet the above requirements . Now in Germany a quick fittings , for example, analysis of its working principle , problems , and suggestions for improvement of the program . 2 connector and the pipe structure pipe connector and tubing is not turned on their structure

Steering hydraulic pipe joints may be sealed structural improvements

Adjustable radial adjustable fitting the steering , the car, and some engineering machinery, hydraulic power steering system, since the space is small, can be widely applied to steering tube fitting. But because of some pipe joints sealed design is unreasonable , resulting in a hydraulic system leak or noise occurs . Our factory is a designated manufacturer of steering hydraulic pump , motor vehicles and some engineering mechanical power steering system that connects the pump and the tank connector to use more steerable bent joints in our service found that some manufacturers of pipe Hydraulic hose fittings Hydraulic hose fittings and pumps port connection is a combination of a sealing gasket used in the form of face seal fitting part shown in Figure 1 , the combination of the radial seal gasket will not achieve the seal , it can only play a seal . Therefore , the oil in the hydraulic screw down the connector locking nut from leaking outward , and are thus outside of the air into the pump , causing oil spills, noise failure.

Oil Drill Collar Thread Repair theory

Oil drill collar for oil wells drilled in the lowest part of the drill string , through the drill pipe and drill bit with taper thread connections . Because of poor working conditions , and therefore the higher the frequency of wear , requiring constant maintenance updates to ensure the normal operation of the drilling platform . For the repair of damaged threads , generally in the thread on the basis of the original processing , to meet the operational needs of the screw thread . Thread Repair can increase oil exploration, mining industry equipment using drill pipe drill collar reuse , extend the actual life of the drill collar , while also serving as resource-saving effect. Lathe repair thread inefficient and relatively low Hydraulic pipe fittings  machining , CNC lathe threading principles and drill collar thread repair works have a certain distinction, affect production and processing efficiency and accuracy of thread . Subject to kinematic principles and screw machine repair theory as key research content. Analysis lathe mechanical structure and the use of ordinary lathe thread feed motion laws, and the use of space geometry approach to sport this movement will function formulas describe the way . Depth analysis of two different processing methods for turning threaded feed , and how to ensure that the movement of thread processing relationship to the correct processing of the tooth type thread . The method describes the use of spatial geometry processing and CNC lathes Thread Thread Repair motion function .

Based on CAD ​​/ CAM / CNC design and manufacture of hydraulic fittings

Hydraulic fittings is a large building and maintenance is an important part of the machinery , the use of CAD / CAM / CNC technology to achieve joint modular design and rapid manufacturing is to ensure the quality of its quality and processing efficiency and effective way. In this paper, based on CAD ​​/ CAM / CNC design and manufacture of hydraulic fittings for a more comprehensive study , the main research contents are as follows : 1, non-standard hydraulic fittings , modular : the analysis of the company 's Jic hydraulic fittings  on the basis of the type and characteristics of established a basic model of hydraulic fittings . According to the model into basic modules ( body ) and add-on modules ( daughter ) , to classify and define , while establishing the main series , sub-module, and ultimately of modularity. 2 , hydraulic fitting CAD-based design : hydraulic fittings in accordance with the classification approach to the company as a research prototype hydraulic fittings from the perspective of parametric design of hydraulic fittings from menu development , modeling, database design, module synthesis steps . 3 , CAM-based hydraulic fittings NC code generation : To investigate the standardization process route hydraulic fittings , cutting elements of the standardization work , especially in the deep understanding of the EdgeCAM post-processor after its transformation , and the establishment of a suitable company CNC the new template system , which derived from the practicality of EdgeCAM NC code

End seal hydraulic fittings Improvement

End seal hydraulic fittings improved end seal Hydraulic pipe fittings  , welded end straight couplings . End sealed with two flat washers a gripping combination to achieve. Such sealing of the following deficiencies : 1. Rotary joint body bind human body fine thread , due process in the tail for a reason undercut . So the inner diameter substantially equal to the diameter of the thread is not easy to achieve a combination washer correct positioning ( alignment ) , the installation pad because easily damaged. 2 . The sealing properties of such end seal

New Marine hydraulic fittings -GS -type flange connection without welding pipe fittings

In marine vessels and offshore engineering ( such as offshore drilling platforms ) Hydraulic Equipment Factory has been the use of a pan , and its increasingly large proportion . Fittings hydraulic system safety and reliability is crucial, conventional welded flanged pipe joints, assembly and disassembly problems , maintenance difficult. Especially in the work of the vessels and rigs , and if found defective pipe joints , should the need for welding , is often impossible. Therefore urgent to disassembly is simple, reliable , without welding flange connection fittings. Therefore, no welding GS flanged hydraulic : a fitting tube came into being , the countries have already put into use. Currently GS -type non-welded hydraulic Hydraulic hose fittings , its technical specifications are as follows : nominal pipe diameter: small 20 a small 165mm, wall thickness 5 mmo working pressure : 42MPa its basic structure has the following two ways: one is with a 37 " flare non- welded flanged pipe joints , another is a ring with a metal hose fittings without welding flange

Fe-Mn-Si-Cr-Ni shape memory alloy pipe joint of

Based on the analysis and abroad since the eighties the development of a new iron-based shape memory alloys on the basis of research results , presented at the pipe joint applications exist three questions: shape recovery rate and the small amount of deformation can be restored ; lack bound state of the alloy , heat recovery stress generated when the study ; alloy pipe joint performance on its application process issues few studies . This paper focuses on the expansion ratio Hydraulic pipe fittings  , recovery annealing temperature , thermal mechanical cycling training and other factors on characteristics of tube connector , and with alloy wire and sheet comparison . In addition, the use of large general-purpose finite element analysis software (ANSYS) on the tube connector system temperature field numerical simulation . Obtain the following innovative research. Quenching temperature has a great effect on the shape memory effect . Alloy at 650 ℃ ~ 750 ℃ ​​range of quenching, the best shape memory effect . This article also found that , with the quenching temperature , quenching medium different shape memory effect of the alloy increasing influence . Quenched in water alloys shape memory effect best . The research results of engineering application laid an important foundation. Thermomechanical cycle training can significantly improve the response rate and the alloy can be restored shape deformation , deformation of the alloy can be improved response alloy constraints led to room temperature after cooling is improved recovery stress σ_r

NiTiNb shape memory alloy pipe fittings strength of the system model and optimization design

NiTiNb pipe joints is a new shape memory alloy pipe joints in piping connections has a good application prospect. The strength of fittings and system optimization design of its structure in its nuclear reactor steam generator vessel piping connections on the application of great significance . This paper studies the NiTiNb alloys at high temperatures sag resistance , and shape memory alloy NiTiNb the response characteristics of various constraints , then the use of solid mechanics knowledge to build up strength NiTiNb fitting a mathematical model system to study the strength of the pipe joint system the variation with temperature , and Hydraulic tube fittings  were optimized . NiTiNb alloy sag resistance will affect the high-temperature strength NiTiNb fittings , so first NiTiNb alloy at different temperatures under different initial anti- stress relaxation properties have been studied , the results showed that: the temperature at 300 ~ 400 ℃, the initial stress at 260 when ~ 360MPa , NiTiNb good stress relaxation resistance alloys , used to prepare the pipe joint in temperature does not exceed 300 ℃, stress does not exceed 360Mpa conditions safely. Shape memory alloy pipe fittings hold on power was taken over from a shape memory alloy phase transition temperature , the restoring force generated constraints

2013年9月14日星期六

Hydraulic coupler in carding machine application

Wool Technology hydraulic coupler in carding machine application  carding machine introduced in the coupling unit localization of Shanghai Jiaotong University, Department of Power Mechanical Liuyun Jia, Wang Zhimin (a) of the fluid coupling working principle and characteristics of fluid coupling is the use of liquid (mineral oil) kinetic energy to pass a driving force-type Hydraulic hose fittings  power transmission equipment. There are roughly variable speed couplings and security type (constant filling) coupling of the points. The former is mainly used for speed control, which is used for conveyor belts and starting high inertia loads and has a load to start and overload capability. Safety couplings (hereinafter referred to as coupling) generally consists of the pump wheel, turbine and rotating housing and other major components. The pump wheel and the turbine are arranged symmetrically, a round radiation and many radial blades parallel to the axis. Before running coupling is filled with working oil when the input shaft rotates to drive the pump wheel, due to centrifugal force, the working oil in the pump driven by the rotor blades from the inside to the outer edge of the impeller, a high-pressure high oil flow and toward the turbine blades, the turbine wheel in the same direction following the rotation of the pump. The turbine working oil flows from the inside of the outer edge, and pressure reducer, and then into the inside of the pump wheel. This endless loop. In this cycle the pump wheel is converted to mechanical work input kinetic energy of the working oil pressure and elevated potential, and the working oil turbine will convert kinetic and potential energy into mechanical work output

Removing fluid coupling new methods and special tools

Mining machinery plexus less mechanized mining face in the work for many years, two mechanized mining work t two scraper conveyor with hydraulic coupling on the reducer shaft some benefits over a half key connection, with more closely, it is difficult demolition the coupling shell material is aluminum alloy, can not be a greater impact force J a configurable split hydraulic coupling bolts fine thread will thread damage during disassembly, it is difficult to remove the fluid coupling, sometimes need to take a long time to smash the fluid coupling can remove the sleeve, so that it can not be seized  Hydraulic pipe fittings  coupling repair Sichuan, bring children to use the unit thousand economic losses, but also seriously affect the production the author, after much thought, came up with a method of removing fluid coupling Sichuan tools and expertise, through use to good effect. Hydraulic coupling disassembly works shown in Figure l, the demolition of the shaft with the special tool shown in Figure 2 closely. Reducer I use hydraulic coupling shaft surface and the center of the inner sleeve larvae L} pressed into an empty month empty the working principle of the use of tanks, can I axis as piston rods, hydraulic coupling sleeve as removing fluid coupling and reducer bushing center

Ships fluid coupling steady, dynamic properties of

Over the past decade our country has entered a fluid coupling major combat ship propulsion system applications, this is because it has the following main characteristics: ① In the "diesel engine and gear box" drive mode, the fluid coupling can be effectively reducing engine torque pulsation reduction gear on the adverse effects; ② in the "diesel + and car gear box" drive mode, charging through the fluid coupling, put oil to Hydraulic tube fittings  achieve the main, engage and disengage the driven shaft to complete the prime mover of the soft power input and withdrawal, which not only improves the peace of the engine loading, and uniform of the load distribution between the prime mover and the resulting balancing of the load control performed simplified; ③ engine load startup can gradually start through the oil-filled high inertia of fixed pitch propellers and controllable pitch propeller, which is conducive to improve the engine start condition. Fluid coupling slip curve and the working range is naturally in the study of the stability of the ship propulsion system / dynamic performance, the fluid coupling mathematical modeling and simulation are most concerned about the objects and contents.

Variable speed hydraulic coupling research and development of intelligent electro-hydraulic control system

In recent years, the governor hydraulic coupling as a mature hydraulic control devices, has been in power, iron and steel, petrochemical, transportation, municipal sector and military equipment and other fields are widely used. Present in these systems, variable speed fluid couplings are mostly open-loop control system is running dynamic characteristics and transmission quality is not very good, thus affecting the overall system speed and energy saving effect. As science and technology and modern production development, especially the development of computer technology, variable speed  Hydraulic adapters  coupling speed closed-loop control functions began to receive attention, so that the servo mechanism relating to the control element, the control method of research has very practical significance. As a kind of hydraulic components, variable speed hydraulic coupling exists complicated dynamics, mathematical model is difficult to establish, the system adjusts the gain parameter uncertainty and serious nonlinear problems. In this article, the author in the servo mechanism, control method and controller implementations have made a new attempt, the use of intelligent control technology to achieve a variable speed hydraulic coupling speed closed-loop control, the control precision is improved, further increasing the governor energy savings, and therefore this topic research has certain practical significance and innovation

High speed hydraulic coupling of the axial force

As a hydraulic transmission fluid coupling device has many advantages. Especially variable speed fluid couplings used in fans, pumps and other energy-saving effect is obvious on the device speed. When the fluid coupling work, will have a greater axial force, fatigue and accelerated bearing wear and shorten bearing life, thereby affecting the life of the machine. Fluid coupling impeller itself, there is no wear, its reliability and longevity is mainly determined by the bearings and seals. Therefore, the study axial force to improve the fluid coupling life and reliability is important. In this paper, the National High Technology Research and Development Program (863 Program) special issue "Large   Hydraulic hose fittings  pump and fan speed control key technology research" , using computational fluid dynamics numerical calculation method, the fluid coupling of the flow field and axial force calculation analysis to identify its variation, and the axial force were tested. Investigate the fluid coupling axial force influencing factors, and to analyze the axial force reduces fluid coupling measures. The main contents and conclusions are as follows: 1, fluid coupling theoretical analysis axial force axial force fluid coupling includes a pump wheel and turbine axial force to the force, they are working chamber and the auxiliary chamber axial axial force power of two parts

Fluid couplings Speed ​​Control System

Large hydraulic pump and fan speed control key technologies ", to apply to the BOF gas blower speed fluid coupling speed as an example to study. Pair of hydraulic coupling system dynamically adjusts the fan speed control feature analysis of the mathematical model derived; fuzzy-PID control method to establish the fan speed hydraulic coupling automatic control system, and the system is simulated. paper, the main contents are as follows: (a) on the converter refining hydraulic coupling steel gas blower speed control system for dynamic regulation characteristics analysis, the fan speed  Hydraulic adapters  coupling system is a part of inertia link plus a delay system with variable parameters expressed. (2) consider the governor hydraulic coupling the mathematical model and fuzzy, PID control advantages and disadvantages, the use of fuzzy-PID control method as a dual speed hydraulic coupling control method and designed the hydraulic coupling speed control system of fuzzy controller, PID control devices and mode switch. (3) in the computer software to create a fluid coupling fan speed mode fuzzy-PID control system model, compared with a single PID control simulation

Hydraulic coupling flow field simulation analysis method and its moment coefficient of

Hydraulic coupling flow field simulation analysis method and its moment coefficient ofFluid coupling is carried out using the kinetic energy transfer fluid hydraulic transmission machinery. Having a flexible transmission, cushion the impact, light-load start, overload protection, torsional vibration isolation, coordination and more balanced power machine drives and other outstanding features, widely used in shipbuilding, metallurgy, power generation, mining and other heavy industries. Through theoretical analysis and simulation technology research, to establish a fluid coupling flow field simulation analysis method, the fluid coupling torque coefficient λ_B theoretical research, combined with the flow field simulation results are summarized λ_B coefficient of variation of the speed n_B and apply JO65XR  Hydraulic tube fittings  coupling verified by experiments. The main contents are as follows. (1) hydraulic coupling flow field simulation analysis methods. First study the current flow field simulation analysis techniques, including turbulence model, mesh generation technology, the formation fluid coupling flow field simulation analysis methods to guide the process. Then the fluid coupling conditions and the flow field to make certain assumptions to facilitate geometric modeling. Combined with STAR-CCM + software, in-depth study fluid coupling dimensional flow field modeling and simulation methods and processes, including geometry, computational grid model, physical model settings, boundary conditions, convergence criteria, the results show, etc.

2013年9月13日星期五

CFD-based high-power variable speed fluid coupling design

In this paper, the National High Technology Research and Development Program (863 Program) special issue "Large hydraulic pump and fan speed control key technology research" (2007AA05Z256), based on three-dimensional multiphase flow theory and computational fluid dynamics (CFD), high-power variable speed hydraulic coupling unsteady two-phase flow is simulated; examples for calculating the numerical results of its flow field velocity and pressure distributions are analyzed in detail reveal its flow field flow pattern and characteristics. Based on three-dimensional flow field numerical solutions of the fluid coupling characteristics predict the theoretical and experimental results were analyzed in order to verify the correctness of the theory and computational methods. In this study based on high-power variable speed  Hydraulic pipe fittings coupling modern design methods, and methods based on UG and CFD governor hydraulic coupling for parametric design and design optimization. The main content of this paper the following aspects: (1) investigate the characteristics of gas-liquid two-phase flow and gas-liquid two-phase flow is currently used in the study of numerical methods are given in several CFD multiphase flow model, and fluid coupling according to the actual situation analysis to determine the model used in this paper. (2) the method based on CFD fluid coupling two-phase numerical simulation to determine the flow field numerical solutions

Variable speed hydraulic coupling fluid-solid coupling and vibration characteristics

As China's economic development, the equipment used in various industrial fields power increases very fast, especially in large pumps and fans increasing the amount of the urgent need for high-power energy-saving products governor. High speed hydraulic coupling as an ideal energy-saving speed products are widely appreciated and applied. Variable speed  Hydraulic tube fittings  coupling at the input speed is constant, by changing the working chamber filling rate to meet the load requirements, and other industrial equipment in the transmission when matched with a smooth start, stepless, torsional vibration impact mitigation equipment to improve transmission quality and many other advantages, and the application speed fluid coupling drive after saving effect is very significant, the greater the power working machine with better energy saving features. Our hydraulic manufacturer does not yet have independent research and high-power variable speed hydraulic coupling products, the ability for our high-power variable speed hydraulic coupling product design in the face of some of the key technical issues, this paper state High Technology research and Development Program (863 Program) special issue "Large hydraulic pump and fan speed control key technology research" (2007AA05Z256), for fluid coupling fluid-structure interaction problems and vibration problems to do a more systematic study . Introduced a system of fluid-solid coupling theory and numerical methods.

Operation using unreasonable

Operation using unreasonable: the premise of quality assurance, if used properly, will greatly shorten the high pressure hose to life. Practical work, much of the damage is due to high pressure hose caused by improper use. (A) subject to frequent and intense pressure shocks. Hydraulic hose assembly to burst, is generally not due to hydrostatic pressure caused by too much to bear, but with the stress intensity and frequency of shocks related. Construction machinery in operation, the hydraulic hose assembly will be repeated within the hydraulic sudden increase or decrease, and thereby constitute a frequent tubing pressure shocks, resulting in damage to seals ministries intensified, blistering and cracking high-pressure hose and pipe loosening the joint leakage. Therefore, in operation, the valve stem can not be pulled too much, must be gentle. (2) use of the oil temperature. Engineering machinery operation, Hydraulic tube fittingsHydraulic tube fittings system power loss due to fluid leaving the heat, coupled with the impact of the outside temperature (especially in the summer), make the oil dramatically. Fluid temperature is higher, the more easy to aging rubber elasticity variation, strength and sealing performance, high pressure hose will soon burst. Thus, in operation, when the hydraulic system in the temperature is too high, too fast, it is timely to identify the reasons, be excluded; summer jobs, especially in continuous operation, should take the necessary measures to cool. (3) selection of hydraulic hose assembly, installation unreasonable. When replacing the high-pressure hose, high pressure hose chosen length of wire layers, joints must be reasonable shape and size, and should minimize the degree of bending of high pressure hose; tighten the connector nut, do not allow high pressure hose distorting, too large bending and twisting will greatly reduce the service life of high-pressure hose; prone to some friction parts should take protective measures to prevent high pressure hose wire layer due to wear and impact. Furthermore due to wire corrosion, reducing wear thin led force, causing burst.