基于ANSYS的聚氨酯蕾形密封圈有限元分析

Finite Element Analysis of Polyurethane Lei-ring Based on ANSYS

利用ANSYS有限元软件建立液压支架立柱上使用的聚氨酯蕾形密封圈有限元模型,仿真分析不同工况下液压支架立柱导向套的密封性能,探讨压缩率和介质工作压力对蕾形圈密封性能的影响。结果表明:聚氨酯蕾形圈Von Mises最大应力出现在与导向套和活塞杆接触区域的中间部分,该区域最先出现裂纹而引起损坏失效;提高压缩率能改善密封性能,但过大的压缩率容易导致蕾形圈内应力过大而出现裂纹;工作压力对密封圈Von Mises应力的影响不大;工作介质压力增大聚氨酯蕾形圈接触压力也增大,且最大接触压力始终大于介质工作压力,能够保证液压支架立柱密封性能。

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 re- suits 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 influ- ence 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 proper- ty of hydraulic support column can be ensured.