??Shield can be divided into the lip shield, tecom combination shield, kang combination shield, the lip dustproof ring can be divided into skeleton lip and shield, frameless lip shield.

??1, the skeleton lip shield

??It makes use of skeleton and cavity hole interference fit to implement resistance, dustproof ring flange and cylinder head end flush, this structure can make the lip from external causes damage, walking more used in engineering machinery, garbage trucks and other machinery lip is easily damaged.

??2, frameless lip shield

??It is mounted on the cylinder entered the closed groove, the design should be the lip slightly protruding cylinder head end, so that is easy to be cleared off by the lip dirt, the structure, installation is convenient, the most widely used, can be used for general industrial walking hydraulic, hydraulic and pneumatic.

??3, a combination tecom shield (ptfe + rubber)

??It by using elastic o-ring has worn polytetrafluoroethylene (PTFE) real-time compensation, wear lip with different material after the o-ring can be used in high speed, high temperature and special working medium.

??4, Mr Kang combined dustproof ring + rubber (polyurethane)

??Not commonly used, the structure is combined with tecom shield, the difference is that the polytetrafluoroethylene (PTFE) into a polyurethane (Pu). It by using elastic o-ring has worn polyurethane (Pu) real-time wear lip compensation, its advantage is better than ordinary lip shield longer life. Shield use notice: all shield are not under pressure, which don't have sealing function, its function lies in the dust, only it must be used with other seals: design should avoid shield lip and piston rod hole or wrench for edge contact slashed.