Self-compensating vacuum punch - New Product Sep 2022

　　The working principle of self-compensating vacuum punch(patented product)is that the open copper ring is always in the"open"situation under the action of the built-in spring elasticity,so that the wear of the outer diameter of the copper ring is automatically compensated by the"expansion"of the ring,and the outer circumference of the copper ring is always in a close state with the inner wall of the material pipe,sealing the inner chamber of the material pipe,achieving the vacuum sealing effect and prolonging the service life of the punch.