The use of seals and mechanical seal system

The seal is a material or part that avoids leakage of fluid or solid particles from adjacent joint surfaces and prevents intrusion of external impurities such as dust and moisture into the interior of the machine. (1) Select suitable seal materials and hydraulic oil, and Adaptability of working temperature and compatibility with oil. [2] (2) The geometric azimuth accuracy (concentricity) of the sliding parts relative to the seal is high (such as hard chrome plating) and the outer surface roughness is fine to extend the service life. 1 The oil seal applied to the hydraulic pump and the motor journal not only requires the roughness of the sliding surface to be within 0.25m of Ra, but also needs to be hard chrome plated on the outside. In the detailed application, it is necessary to adjust the diameter of the lip of the oil seal according to the details. The spring force is applied to make it tightly elastic, and a device sleeve or a thin gasket is used to protect the sealing ring when the device is installed, so as to prevent the lip from being rolled and twisted, and the spring is slipped out. 2 The internal and external rolling processing methods of hydraulic cylinders not only improve the surface roughness, but also make the appearance of the cold work hardening treatment, which is beneficial to prolong the service life of the sealing ring. In addition, the applied pressure, the length of the sliding surface and the variety have a great influence on the service life. Therefore, the "fixed inspection" time should be determined according to these conditions. 3 The sealing surface of the demand is smooth and the dirt is invaded. It is also a necessary condition to use the oil and the correct device to reach the specified cleaning level.