The state of the lip seal should be classified and discussed. The following is the manifestation of several states of the lip seal:
(1) When the seal is not installed, there are four sizes, which can be seen by everyone and measured with a measuring tool. The four dimensions are: the inner diameter of the seal root, the outer diameter of the root, the inner diameter of the lip and the outer diameter of the lip. (2) When the seal is installed in the groove and is not working, the groove size remains unchanged, and the size of the seal has all changed, the four dimensions are: the outer diameter of the seal root and the outer lip diameter change to the groove outer diameter at the same time; The diameter of the inner lip is the diameter of the piston rod, and the inner diameter of the root is the gap between the seal and the piston rod plus the diameter of the piston rod.
(3) When the cylinder begins to work and pressure, the working state of the seal is: the inner and outer lips are close to the inside, and the outer wall is slightly moved backward. The root of the seal is squeezed backwards, and as the pressure increases, the hydraulic oil exerts greater force on the seal, and the overall deformation of the seal increases. When the working cycle is completed and the cylinder is under no pressure, the seal is restored to its original state. Repeated deformation, repeated recovery, until the seal lip effective amount is lost, the seal is damaged.