The theory of hydraulic reciprocating seal is essentially the study of the interaction of relative moving surfaces.Wear between the seal coupling surfaces Friction between the seal coupling surfaces will cause the gradual loss or migration of the sealing element material, that is, the wear of the seal. In tandem sealing, the seal is independently supported, and each sealed embankment is separated from each other, as shown in Figure 4.

The reciprocating seal stops moving and stays for a long time, and it will approach the dry friction state when restarting. To avoid dynamic leakage, a series seal can be used, such as two PTFE coaxial seal and a PTFE double oil scraper seal form the piston rod seal of the hydraulic cylinder. (2) Increase the controllability of the reciprocating seal. Whether in terms of film thickness or friction characteristics, there is still a blank area between elastohydrodynamic lubrication and boundary lubrication, while mixed lubrication only describes the lubrication performance when various lubrication states coexist, and does not have basic and independent

The lubrication mechanism. v is the relative movement speed, μ is the dynamic viscosity of the lubricating oil, and Pm is the average load pressure. Since the emergence of the emerging edge disciplines-friction, wear and lubrication in the 1970s, sealing devices have been studied as a system to make the relative movement of flexible (rubber) and rigid surfaces, rather than the relative movement of two rigid surfaces.

There are C28 Ball Bearing oil on both sides of the piston seal. It can be sealed by an energized rectangular cross-section PTFE seal ring, and an additional outer bearing ring made of PTFE material protects the piston from wear particles Infringe. (3) Make full use of system internal resources to improve sealing performance
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