In hydraulic cylinders the most commonly used guides are guide rings and guide strips. They accommodate radial loads of forces acting on the cylinder assembly and guide the rod in the cylinder head as well as the piston in the cylinder bore. Kintowe produce guide rings since 1993, pls contact [email protected] for more information.
The extremely small leakage requires the hydraulic seal to have a very small leakage and a good sealing effect.The performance of hydraulic sealsAs the pressure of the hydraulic oil increases, its sealing effect is automatically improved. Even under the harsh working environment of high pressure and high temperature, the leakage of the hydraulic seals has not increased significantly.Good compatibility Because hydraulic seals are immersed in hydraulic oil for a long time, they are easy to swell, dissolve or become brittle and hard, etc., making them lose their sealing effect. Therefore, hydraulic seals are required to have good compatibility with hydraulic oil.Low friction resistance In order to avoid or reduce the adverse phenomena such as low-pressure crawling produced by hydraulic equipment, hydraulic seals are required to have low static friction resistance and dynamic friction resistance, and the friction coefficient should be very stable.Long service life Hydraulic seals should have good elasticity, heat resistance, cold resistance, pressure resistance, wear resistance, and certain physical and mechanical strength, and have a long service life.Low-cost hydraulic seals should be easy to manufacture and install, and their corresponding sealing grooves are easy to process and manufacture, and the requirements for the machining accuracy of the sealing surface are low, and they are inexpensive and inexpensive.Structure of hydraulic sealCommonly used self-sealing compression hydraulic seals are mainly ○-shaped sealing rings, round sealing rings and square sealing rings. They have the advantages of simple structure, easy manufacturing, low cost, etc., so they are widely used in hydraulic transmission systems Dynamic sealing element and static sealing element. They are usually installed in the sealing groove to produce 10-25% of the radial compression deformation, and produce a higher initial contact stress on the sealing surface, thereby preventing the leakage of non-pressure liquid.When the hydraulic cylinder is working, the pressure liquid squeezes the self-sealing compact hydraulic seal to further deform it, and generates a large pressure with the pressure liquid on the sealing surface, which should be strictly speaking the pressure. The increased and increased additional contact stress, together with the initial contact stress, prevents pressure fluid leakage. However, when the working pressure is greater than 10Mpa, in order to prevent a part of the synthetic rubber self-sealing compression hydraulic seal from being squeezed into the sealing gap and being cut off during the reciprocating movement of the hydraulic cylinder to cause leakage, the synthetic rubber self-sealing pressure The pressure-sensitive side of the tight hydraulic seal is provided with a synthetic resin retaining ring, such as a nylon retaining ring, a polyacetal retaining ring and a filled polytetrafluoroethylene retaining ring.Because the synthetic rubber self-sealing compression hydraulic seal has a large compression deformation during operation, its static friction resistance is particularly large, usually more than twice its dynamic friction resistance. Such a large static friction resistance is bound to cause undesirable phenomena such as low-pressure crawling and difficult operation in some low-pressure hydraulic transmission systems. This is why self-sealing compact hydraulic seals are very small and used as dynamic seals alone.Classification of hydraulic sealsLip seals The commonly used hydraulic combination seals of hydraulic machinery and hydraulic cylinders in ceramic factories are mainly composed of ○-shaped seals and square seals, U-shaped seals, Y-shaped seals, YX-shaped seals and other special-shaped hydraulic seals. The superposition of circles is composed ofV-shaped sealing ring has good sealing performance. The number of sealing rings can be determined according to the working pressure. Usually, the gland adjustment must be used to compensate for the wear of the sealing ring. The fatal weakness is the structure It is complicated and usually consists of three parts: support ring, seal ring and pressure ring. Its friction resistance is large and increases with the increase of working pressure and the number of seal rings. Therefore, the V-shaped sealing ring is only suitable for hydraulic cylinders with low moving speed and high working pressure.U-shaped sealing ring The U-shaped sealing ring has good sealing performance, but it is very easy to roll when used alone, so it needs to be used with a tin bronze support ring. Its friction resistance is large and increases with the increase of working pressure. Therefore, the U-shaped sealing ring is only suitable for hydraulic cylinders with lower working pressure or lower moving speed.Y-shaped seal ring Y-shaped seal ring relies on its opened lip to close to the sealing surface to maintain the seal, usually can be used alone, its sealing performance is better, less friction resistance, good pressure resistance performance, working stability Good and long service life. Therefore, the Y-shaped sealing ring is suitable for hydraulic cylinders with high-speed variable pressure, large cylinder diameter and large stroke.YX-shaped seal ring YX-shaped seal ring is a Y-shaped seal ring with a ratio of section height to width greater than 2 and unequal height of working lip to non-working lip. It is divided into YX-shaped seal ring for hole and YX-shaped seal ring for shaft. The sealing performance is the same. In addition to all the advantages of the Y-shaped seal ring, the YX-shaped seal ring never rolls when used alone, further improving its pressure resistance and working stability. Therefore, the YX-shaped sealing ring is particularly suitable for high-pressure, high-speed variable pressure and fast-moving hydraulic cylinders.Self-sealing compact hydraulic seals: Lip seals, like self-sealing compact hydraulic seals, produce a higher initial contact stress on the sealing surface according to their own deformation, preventing leakage of non-pressure liquid. When the hydraulic cylinder is working, the pressure liquid squeezes and expands its sealing lip, making it close to the sealing surface to produce a higher additional contact stress that increases with the pressure of the pressure liquid, and together with the initial contact stress to prevent the pressure Liquid leakage.Combined seals The commonly used combined seals of hydraulic cylinders are mainly bud ring, grid ring and ster seal.1: bud circleThe bud ring is usually composed of the superimposed use of a synthetic rubber ○-shaped sealing ring and a cloth-rubber-shaped Y-shaped sealing ring, and is combined with a self-sealing compression hydraulic seal and a self-sealing compact hydraulic sealing ring, lip type Like the seals, it generates a higher initial contact stress on the sealing surface according to its own deformation, preventing leakage of non-pressure liquid. When the hydraulic cylinder is working, the pressure liquid always squeezes and stretches the sealing lip of the Y-shaped seal ring through the elastic deformation of the ○-shaped seal ring, so that it is close to the sealing surface and produces a higher pressure that increases with the pressure of the pressure liquid. The additional contact stress, together with the initial contact stress, prevents leakage of pressure fluid.2: Grid CircleThe grid ring is usually composed of the superimposed use of a synthetic rubber ○-shaped sealing ring and a PTFE-filled square sealing ring. It can be divided into a grid ring for holes and a grid ring for shafts, but its seal The effect is the same, according to its own deformation to produce a higher initial contact stress on the sealing surface to prevent the leakage of non-pressure liquid. When the hydraulic cylinder is working, the pressure liquid will squeeze the square seal ring to the maximum extent through the elastic deformation of the ○-shaped seal ring to make it close to the sealing surface to generate a higher additional contact stress that increases with the pressure of the pressure liquid. Together with the initial contact stress, it prevents pressure fluid leakage.3: StefanSterling seal is usually composed of a synthetic rubber ○-shaped sealing ring and a special shape rectangle filled with polytetrafluoroethylene-trapezoidal sealing ring, which can be divided into a hole sealing and shaft like the Glai ring With the Sterling seal, its sealing function and sealing mechanism are the same as those of the Gele ring, but it only has a one-way sealing effect.Self-sealing compact hydraulic sealing ring: lip-shaped sealing ring, the contact area of the lip that closely fits the sealing surface is small, can produce greater compression deformation, and obtain a better sealing effect. But it is easy to wear, and its sealing effect is significantly reduced after wear. If a ○-shaped sealing ring is used in superposition with it, that is, when the seal is combined, even after the lip is worn, because the synthetic rubber ○-shaped sealing ring has greater elasticity, it It will force the lips of the lip-shaped sealing ring to be close to the sealing surface, and generate sufficient surface contact stress to achieve the sealing effect, and the friction resistance is small, the work is stable, and it is easy to assemble and maintain. Therefore, the hydraulic seals widely used in fully automatic hydraulic brick presses, daily ceramic products, discs, dishes and other static pressure forming machines and medium pressure grouting and high pressure grouting sanitary ceramic forming machines are almost all combined seals, such as Glai circle and Stir circle etc.
O-rings are rubber seals with a circular cross-section. Because of their O-sections, they are called O-rings, also called O-rings. It began to appear in the mid-19th century when it was used as a sealing element for steam engine cylinders.Because of its cheap price, simple manufacturing, reliable function, and simple installation requirements, the O-ring is the most common mechanical design for sealing. The O-ring is subjected to tens of megapascals (thousand pounds) of pressure. O-rings can be used in static applications, but also in dynamic applications where there is relative movement between components, such as the Top quality PTFE Filled With Bronze GuideTapes manufacturer from China shaft of a rotary pump and the piston of a hydraulic cylinder.Scope of O-ringO-ring seals are suitable for installation on various mechanical equipment, and play a sealing role in static or moving state under the specified temperature, pressure, and different liquid and gas media. In machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and various types of instruments, various types of seals are widely used element. O-rings are mainly used for static sealing and reciprocating sealing. When used for rotary motion sealing, it is limited to low-speed rotary sealing devices. O-rings are generally installed in grooves with a rectangular cross-section on the outer or inner circle for sealing. O-ring seals still play a good role in sealing and shock absorption in the environment of oil resistance, acid and alkali, grinding, chemical corrosion and other environments. Therefore, the O-ring is the most widely used seal in hydraulic and pneumatic transmission systems.Material classificationNatural rubber N R(Natural Rubber) Made from latex collected from rubber trees, it is a polymer of isoprene. Has good wear resistance, high elasticity, tear strength and elongation. It is easy to aging in the air, it becomes sticky in heat, it swells and dissolves in mineral oil or gasoline, and it is resistant to alkali but not strong acid. · It is the raw material for making adhesive tape, hose, rubber shoes, and is suitable for making shock-absorbing parts, and products used in hydroxide-containing liquids such as automobile brake fluid and ethanol.Styrene butadiene rubber S B RStyrene Butadiene Copolyme is a copolymer of butadiene and styrene. Compared with natural rubber, Styrene Butadiene Copolyme has uniform quality and less foreign matter, but its mechanical strength is weaker. It can be blended with natural rubber.Butyl rubber IIRButyl Rubber is made from the polymerization of isobutylene with a small amount of isoprenes. It retains a small amount of unsaturated groups for vulcanization. Because the movement of steric barrier molecules of methyl group is less than other polymers, the gas permeability is less. It has high resistance to heat, sunlight and ozone, and good electrical insulation; it has high resistance to polar solvents such as alcohols, ketones, and esters, and the general use temperature range is -54~110 ℃.O-shaped rubber sealing ring is a sealing element with a circular cross-sectional shape. It is widely used in a variety of mechanical equipment and plays a sealing role in a certain temperature, pressure and different liquid or gas medium. Compared, it has the following superior performance:--Suitable for multiple sealing forms: static sealing, dynamic sealingSuitable for all kinds of materials, the size and groove have been standardized, and the interchangeability is strong--Suitable for a variety of movement methods: rotary movement, axial reciprocating movement or combined movement (such as rotary reciprocating combined movement)--Suitable for many different sealing media: oil, water, gas, chemical media or other mixed mediaThrough the selection of appropriate rubber materials and appropriate formula design, it can effectively seal oil, water, air, gas and various chemical media. The temperature can be used in a wide range (－ 60 ℃～+ 220 ℃), and the pressure can reach 1500Kg/cm2 in fixed use (combined with the reinforcement ring).--Simple design, compact structure, convenient assembly and disassemblyThe O-ring cross-sectional structure is extremely simple, and has a self-sealing effect, and the sealing performance is reliable.Because the O-ring itself and the structure of the installation site are extremely simple and standardized, it is very easy to install and replace.--Various materialsCan be selected according to different fluids: nitrile rubber (NBR), fluorine rubber (FKM), silicone rubber (VMQ), ethylene propylene rubber (EPDM), neoprene rubber (CR), butyl rubber (BU), polymer Tetrafluoroethylene (PTFE), natural rubber (NR), etc.--low cost- Dynamic friction resistance is relatively smallPressure and sealing gapO-shaped rubber seals are generally sealed by the rebound produced by compression, but as the pressure increases, it is squeezed into the seal turbidity and changes in shapeIn order to make the O-shaped rubber sealing ring have a good sealing effect and extend the service life, the gap between the installation groove of the O-shaped rubber sealing ring and the sealing part must be designed properly. When the gap is too large, the O-shaped rubber sealing ring is The gap is squeezed under the action, causing damage and causing leakage.Relationship between the hardness of O-ring rubber material and working pressureIn the rubber material standard, the two properties of hardness and compression set are the most important. Choosing a rubber material with less compression deformation is beneficial to the sealing performance, and the hardness is also crucial to the pressure resistance and squeeze resistance of the O-shaped rubber sealing ring. According to domestic standards and practical experience, the maximum compression set of rubber at a specified temperature does not exceed 50%. The hardness of the rubber is closely related to the working pressure of the seal. The higher the pressure, the higher the hardness.Groove finish requirements and groove and compressionThe smoothness of the groove and the roughness of the groove contact surface have a great influence on the sealing effect and durability.The compression rate of the O-shaped rubber sealing ring for fixed sealing is generally 15-25% (this data is empirical data), and the compression rate is 10-12% in the case of reciprocating motion, and generally 3-5 in rotary motion % Compression rate.
The concept of corrosion of metalsThe metal material is damaged by the surrounding medium, called Metallic Corrosion. Corrosion of metals is the most common form of corrosion. During corrosion, a chemical or electrochemical multiphase reaction occurs at the interface of the metal, causing the metal to transition to an oxidized (ion) state. This will significantly reduce the mechanical properties of metal materials such as strength, plasticity and toughness, destroy the geometry of metal components, increase wear between parts, deteriorate physical properties such as electrical and optical, shorten the High quality guide rings for excavators supplier in China service life of equipment, and even cause disasters such as fires and explosions. Sexual accidents. In 1975, the economic loss caused by metal corrosion in the United States was 70 billion US dollars, accounting for 4.2% of the GDP of the year. According to statistics, the annual steel loss due to metal corrosion accounts for about 10 to 20% of the steel output of the year. Indirect losses caused by accidents such as production shutdowns and power outages are even more incalculable. Metal corrosion is very common. Such as rusty iron products (Fe2O3·xH2O), white spots (Al2O3) on the surface of aluminum products, copper green [Cu2(OH)2CO3] on the surface of copper products, blackening of silverware surfaces (Ag2S, Ag2O), etc. are all metal corrosion, including Corrosion is the most common metal—iron products.Metal materials are one of the key materials in modern production. However, due to multiple factors such as the environment, metal materials are prone to different degrees of corrosion during mechanical processing.Metal materials perform better in terms of strength, stiffness, etc., but corrosion phenomena are more common, which can adversely affect parts in a certain area or even the entire system. Therefore, it is significant to do anti-corrosion work in a reasonable way, which is an important way to extend the life of equipment.Metal composite materials in machinery manufacturingMetal composite materials are based on various types of metal materials and are obtained after metallurgy and other processes. Compared with conventional metal materials, this type of material performs better in terms of strength and wear resistance.Formation and type of corrosionAll kinds of materials will approach a low energy state and maintain stability. Metals are mainly achieved through the way of metal oxides, especially various precious metals represented by gold and silver. The role of such materials in the natural environment The state of oxides has been maintained, and metals must be extracted from them in a very complicated way. When the metal returns to the "unclean" state against the will, corrosion occurs. From the perspective of the type of corrosion, there are mainly two types of chemical corrosion and electrochemical corrosion. According to the phenomenon of corrosion, it can be divided into uniform corrosion and local corrosion of the material somewhere. The inducing factors of corrosion are intricate. For cutting technicians, among the various types of corrosion, the most common is surface corrosion due to rust; in various types of mechanical processing equipment, electrochemical corrosion is dominant.Causes of corrosionAmong the causes of corrosion of metal materials, the most critical is electrochemical stability. If the potential value is negative, the stability of the material is low. The greater the negative value, the stronger the instability. The metal Ionization is more obvious, leading to significant corrosion of the material . In addition, the internal components of the metal alloy will also affect the quality of the material. Unlike the single alloy material, the probability of corrosion of multiple alloys is relatively higher, because the physical and chemical properties of each item are more obviously different. The potential generated after reaching the electrolyte is also different. For example, under the effect of heat treatment, a variety of metallographic structures will appear in the material. After quenching, the various structures are evenly arranged. This stage has strong corrosion resistance; but after entering the tempering stage, the carbon in the process The amount of precipitation of the precipitated phase of the substance increases significantly, which leads to a significant decline in the corrosion resistance of the material. If the metal surface lacks flatness, the probability of corrosion will increase significantly at this time. Moreover, the metal will be in a more extreme cold or heated environment during the processing stage. For non-oxidizing acid salts, substances of this nature will be more likely to affect the stability of the metal material and cause significant corrosion. This phenomenon is significantly more than in alkaline salt environment.Corrosion protectionThere are many ways for parts to be corroded. Corrosion is easy to occur if the protection is not proper during processing and storage. In view of this feature, it is necessary to protect it in a reasonable way to minimize the corrosion of metal materials.Corrosion protection during cuttingObviously, there is a high probability of metal corrosion in a humid air environment, so after completely isolating the two, it can have an anti-corrosion effect, but from the actual situation, the production does not have the conditions to completely isolate the humid air, it is more appropriate The main ways to limit corrosion are as follows: (1) Internal protection: Incorporation of alloy elements with better corrosion resistance improves the corrosion resistance of the metal material itself. (2) External protection: The outer periphery of the material is protected by painting and adding metal coating to make the material isolated from the air.Corrosion protection measuresFor the bare parts of the machine tool, it can be treated by painting. If there are defects in the protective layer during subsequent use, they must be filled in time. If the protective agent and the cooling lubricating fluid do not have compatibility, the two will also corrode when they are in contact, so it is necessary to change the state of the two in a reasonable way to achieve a compatible effect. The cutting process is accompanied by obvious disturbance, which causes damage to the original protective layer, and the workpiece obtained after processing is also prone to corrosion. In this regard, the proper amount of corrosion inhibitors mixed in the cooling lubricant is to produce a dense passivation film, but we must pay attention to the control of the emulsion concentration and adjust it to the optimal range. After processing, the workpiece can be painted or soaked to form a complete protective layer on the surface of the workpiece. In addition, after processing, paraffin can also be used to achieve antiseptic effects.In short, the comprehensive use of metal materials has a good effect and is widely used in the machinery manufacturing industry. However, metal materials are easily affected by factors such as temperature and acidity and alkalinity, resulting in different degrees of corrosion, which is not conducive to the normal use of materials. In the manufacturing process, it is necessary to protect metal materials through various means to improve their corrosion resistance.
A hydraulic seal is the most important device of mechanical machinery. Any industry sector that runs hydraulic applications such as aviation landing gear, reciprocating pumps, combustion engines and so on, need these seals to carry out specialized functions. It is a gasket-like structure typically used to seal the high pressure and hydraulic fluid present inside a hydraulic cylinder. Normally, it is made up of two types of materials such as polyurethane and rubber. The use of these materials mandates the specific amount of heat or pressure the seal is ideally subjected to undergo when in use.The simple principle of workSince hydraulic seals are available in two types namely dynamic and static seal, the principle of work orbits based on the same properties. This seal is fitted onto the inner hydraulic cylinder shaft and is conveniently sealed against the outer cylinder case. When the hydraulic fluid streams into the hydraulic cylinder, a high pressure is created inside the system that is only wielded by a hydraulic sealThe static-type of seal is a non-moving seal and is fitted within the groove of the system. Due to its stationary mounting design, this type of seal has a lot of capacity to withstand a huge amount of pressure. On the other hand, a dynamic seal is used in the inner shaft of the cylinder and can withstand movement against its inner opening.All in all, hydraulic seals are very useful devices in industry sectors. They effectively prevent the leaking of hydraulic fluids and rules out the Premium quality PFC-1 Cotton Fabric Phenolic Wear Rings China factory wholesale need to replace or rebuild a damaged cylinder.There are plenty of tools and equipments that are required to carry out industrial and manufacturing processes. The hydraulic seals are one such useful tool that can be used for a number of different purposes. There are, in fact, different hydraulic actions, and each of these actions requires the usage of specially designed tools. These seals are designed to assist in transferring power from a hydraulic system to the linear motion by containing the oil for the pressure. If the oil is not controlled, the pressure within the system will pass, and this in turn, will result in the failure of the entire system. In addition to that, these seals can also keep away the dirt from the system, by means of which the entire hydraulic action remains efficient.Different Designs to Suit the Requirements of Industrial Process. There are, in fact, three different types of hydraulic seals, and these seals can be used for different purposes. These include the rod seal, the piston seal and the wiper seal. As the name implies, the function and usage of these seals are also different. However, often these different seals are also used together to serve a specialized function. In the recent days, there has been such a technical progression that these seals can be used in combination to serve a greater purpose.Usage along with Other Tools.Apart from these seals, there are other tools also available that can be used to perform other functions. For instance, the O-rings are also one of them. These can not only be used as sealing elements, but at the same time, these can also be used to offer energetic element to the seals and wipers associated with hydraulic action. This in turn, gives an indication that these can also be used in wide varieties of fields in an industry ranging from automation to aerospace to even general engineering.
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