高强度安全型柱塞式氮气弹簧优化设计与仿真

Optimized design and simulation of high-strength safe plunger-typed nitrogen spring

为解决氮气弹簧缸筒由于损伤破坏导致的安全隐患问题,文中采用有限元仿真方法找到了与实际损伤一致的关键隐患点,并优化设计出一种新的高强度安全型柱塞式氮气弹簧结构。仿真结果表明:仿真可有效地反映出安全问题关键所在;优化后的氮气弹簧结构与原结构相比,柱塞杆上最大应力从501.36 MPa减小至183 MPa,大大提高了柱塞杆结构强度;新结构中端盖应力最大,且柱塞杆的两级凸台具有应力差,可在危机时实现卸压保护和多级防脱功能;该新结构满足实际工作要求,并具有较高的强度及更好的安全性。

In this article,in order to solve the safety problems caused by damage to the nitrogen spring’s cylinder barrel,the finite-element simulation is used to find the key hidden points consistent with the damage,and the a new high-strength safe plunger-typed nitrogen spring is designed.The key safety issues are identified through the simulation experiments.Compared with the original structure,the optimized nitrogen spring has many advantages.The maximum stress on the plunger rod reduces from 501.36 MPa to 183 MPa,which greatly increases its structural strength.The new structure has the highest stress on the middle-end cap,and the two-stage convex platforms of the plunger rod have a stress difference,which achieves pressure relief protection and multi-stage anti-release function in a crisis.This new structure meets the working requirements,with higher strength and better safety.