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Seal the use of points

Update:29 Jan 2018
Summary:

Seals are materials or parts that prevent fluid or soli […]

Seals are materials or parts that prevent fluid or solid particles from leaking between adjacent bonding surfaces and preventing intrusion of external contaminants such as dust and moisture into parts inside the machine.
 (1) Select the appropriate seal material and hydraulic oil, as well as the adaptability of the working temperature, oil compatibility.
(2) relative to the seal sliding parts geometry accuracy (concentricity) high material quality (such as hard chrome plating) and the surface roughness can be extended to extend the service life.
 ① For the hydraulic pump, the oil seal used in the motor journal not only requires the roughness of the sliding surface to be within 0.25 m Ra, but also requires the hard chrome plating on the surface. In the specific use, the oil seal lip diameter needs to be properly adjusted according to specific situations To the spring force to make it tight and moderate, but also in the installation with a mounting sleeve or shim to protect the gasket, so as not to roll over the lip, twisted, resulting in the spring slide out.
 ② The inner surface of the hydraulic cylinder barrel commonly used rolling method, not only to improve the surface roughness, but also to make its surface cold hardening, will help extend the life of the seal ring. In addition, the pressure used, the length and type of sliding surface also have a significant impact on service life. Therefore, it should be based on these conditions determine the "fixed inspection" of time.
③ Require sealing surface lubrication is good, to prevent dirt intrusion. It is also necessary to use the fluid that meets the specified cleaning level and the correct method of installation.

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