Abstract:Finite element model of polyurethane lei-ring seal used in hydraulic support column was established by using finite element software of ANSYS.The sealing property of the guide sleeve of hydraulic support column under different working conditions was simulated and analyzed.The influence of the compression ratio and medium pressure on sealing property was studied.The results show that the maximum Von Mises stress of polyurethane lei-ring is appeared in middle portion between contact area of the guide sleeve and piston rod, and the crack is firstly appeared in this area, which results in the damage of polyurethane lei-ring.The increase of compression ratio can improve sealing property, but larger compression ratio is easily to cause larger inner stress of lei-ring and lead to the crack.The working pressure has less influence on Von Mises stress of the seal.As the pressure of working medium increased, the contact pressure of lei-ring is also increased, and the maximum contact pressure is always larger than the working pressure of medium, so the sealing property of hydraulic support column can be ensured.