There are many factors that affect the sealing performance of O-rings. Among them, pressure is an important factor affecting the quality of seals. The level of pressure and the length of pressure cycle changes have great effects on seal damage (such as extrusion). Impact. The higher the pressure, the greater the impact of other factors on the performance of the seal, such as temperature, speed, seal material, clearance between the piston and cylinder, and clearance between the piston and cylinder head.
There is also temperature and friction. It is difficult to describe the maximum use temperature and minimum use temperature of a seal material, because it is the result of the combined effect of a series of factors. For the different working temperatures of the piston and the piston rod, they should be selected differently. Another is the surface roughness of the seal product, the characteristics of the surface, the pressure, the medium, the temperature, the material of the seal, the type of the seal and the speed of movement, which are all factors that affect the O-ring. Experience has shown that the influence factors of imported and imported O-rings The characteristics of the cylinder piston and the surface of the piston rod have a great influence on the life of the seal. These are the factors that affect the sealing performance of O-rings.
There are many reasons for twisting damage, the most important of which is due to the uneven gap between the piston, piston rod and cylinder, excessive eccentricity, uneven diameter of the O-ring section, etc., due to the friction caused by the O-ring in one week. Uneven force, some parts of the O-ring rub too much and twist. Generally, O-rings with smaller cross-sectional dimensions are prone to uneven friction. cause distortion. In addition, due to the concentricity deviation of the sealing groove, the uneven sealing height and the uneven diameter of the O-ring section, it may cause a part of the O-ring to be compressed too much, while the other part is too small or not compressed. When the groove is eccentric, that is, the coaxial deviation is greater than the compression of the O-ring, the seal will fail completely.
Analysis of the reason for the distortion of the sealing O-ring Another disadvantage of the large deviation of the groove coaxiality is the uneven compression of the O-ring along the circumference. In addition, due to the unevenness of the O-ring section diameter, material hardness, lubricating oil film thickness, etc., as well as the surface roughness of the sealing shaft, part of the O-ring slides along the working surface, while the other part rolls, resulting in Twisted O-rings. It is a very dangerous thing for the O-ring to be twisted in the process of work, and you should pay attention to avoid it every day!