Easy to manufacture, assemble and disassemble. It should be able to improve the sealing capacity, increase the pressure, and be conducive to automatic wear compensation. There are many ways to seal the commonly used rotating shaft with lip, which can be selected according to the standard. The surface roughness of the shaft at the sealing position r = 0.2-0.63. No spiral machining trace is allowed on the shaft surface contacting with the sealing ring. The shaft end shall have a leading angle less than 30 °, and the chamfering shall be free of sharp edges, burrs and rough machining residues.