Hot Search：Hole SealShaft SealRotating SealUniversal Plug

　　1: movement speed
　　The movement speed is very low (less than 0.03/s), to consider the stability of equipment operation and the occurrence of crawling phenomenon. Velocity is very high (more than or equal to 0.8 m / s), the lubricating effect of ink may be destroyed, seal due to lack of good lubrication and frictional heating, resulting in greatly reduces life expectancy. Recommended rubber work in 0.3m/s~1.2m/s with suitable sealing speed range.
　　2: temperature
　　The low temperature will make rubber composite seal elasticity, causing leakage, or even the entire seal becomes hard brittle. High temperature can make the volume expansion of the oil seal, soft, resulting in a rapid increase in friction resistance and pressure resistance of the oil seal. Recommended rubber plastic composite sealing continuous working temperature range of -10~+80 DEG C.
　　3: working pressure
　　Oil seal has the lowest starting pressure requirements. Low friction performance, low friction performance, small oil seal. Under 2.5MPa, the rubber plastic composite sealing is not appropriate, the high pressure to consider the seal pressure, anti extrusion ring groove processing needs also have special requirements.
　　4: working medium:
　　In addition to strictly follow the recommendations of the manufacturer's recommendation to work outside the media, to maintain the cleanliness of the working medium is essential. Oil pollution or aging will not only enable system component failure, accelerate oil aging and wear and the booty may scratch or embedded in the seal, the seal failure. Therefore, it is necessary to regularly check the oil seal quality and cleanliness, and to replace the oil filter and oil filter according to the maintenance of the equipment. In the oil cylinder oil residual air diameter high compression generates high temperature to burn oil, even carbonization. In order to avoid this kind of situation, the exhaust treatment should be carried out in the hydraulic system. Hydraulic cylinder also should be in the low pressure slow running for a few minutes, confirmed that the remaining oil in the air, can be normal work.
　　5: lateral load
　　On the piston, the support ring is generally necessary to ensure that the oil cylinder can bear a large load. Sealing member and the support ring plays a completely different role, sealing element can not be instead of support ring load, lateral force of hydraulic cylinder must be and bearing ability of the support ring, heavy metal available ring) to prevent oil seal under the condition of eccentric work caused by leakage and abnormal wear.
　　6: hydraulic shock
　　There are many factors producing hydraulic impact, such as the excavator bucket suddenly hit the stone, crane lifting or lowering weights of the moment. Except in the factors, the high pressure and large flow hydraulic system, the implementation of components (hydraulic cylinder or hydraulic motor), if the performance is not good, it is easy to produce a hydraulic shock. Hydraulic impact of instantaneous high pressure may be several times the working pressure of the system. This high pressure in a very short period of time will seal tear or local involvement within the gap, causing serious damage. General cylinder hydraulic shock buffering ring and the ring should be installed on the piston rod. Buffer ring is arranged in front of the oil absorption of most of the shock pressure and the ring to prevent oil under high pressure squeezed into the gap, the roots were bad bite.
　　7: the processing precision of oil tank
　　Experimental results show that the contact with the oil seal movement of the working surface, surface roughness Ra of more than 0.8 m, seal leakage and wear value rise will directly, therefore, it is suggested that working surface rough Ra0.1~0.8 M. in order to ensure the sealing performance of the rubber plastic composite sealing to avoid in the assembly process of damaged seals, the following aspects should be considered in the design and installation of the hydraulic cylinder:
　　1): cylinder
　　A: Material: carbon steel, low pressure system and the friction condition better places available aluminum alloy, bronze, stainless steel, etc. B: by the surface quality and roughness: inner surface are generally required to honing, polishing or rolling, to Ra0.1~0.8 m roughness, and shall not be horizontal and vertical knife grain.
　　2) piston rod
　　A: Material: general carbon steel, chrome steel, low pressure system and good friction conditions can be used in aluminum alloy, bronze, stainless steel, etc..
　　B: surface quality and roughness: the requirements of the rough degree of Ra0.2~0.4 m, the surface of the heat treated hard chromium. Hydraulic cylinder of engineering machinery with the piston rod is likely to be sand and gravel, the surface hardness of the above HRC60.
　　C: oil seal installation groove
　　D: local structure design
　　E: wear ring sliding with gap F and oil seal extrusion gap G