井下移动式液压破碎机工作机构疲劳寿命分析

Fatigue life analysis for underground mobile hydraulic crusher working mechanism

为了探究井下移动式液压破碎机工作机构破坏的原因,为改进结构、改善工作性能和延长使用寿命提供依据,在Pro/E和Adams协同仿真坏境下确定了某型移动式破碎机工作机构的4种典型工况,根据冲击机械系统波动力学理论,导出该破碎机破碎岩石时冲击载荷的计算模型。使用ANSYS有限元分析软件对工作机构进行疲劳寿命分析。结果表明,在最大破碎深度时,小臂与小臂油缸铰接位置的疲劳强度最低,疲劳寿命为1.032×107次循环,损伤累计值为0.969;安全系数仅1.03,不满足结构设计要求,需对结构进行改进。

In order to explore destructive causes of a underground mobile hydraulic crusher working mechanism to offer the foundations of improving the structure and the working performance and pro- long the service life, four typical conditions for a certain type of mobile hydraulic crusher working mechanism are defined under the environment of co-simulation of Pro/E and ADAMS. Impact load calculation model for broken rock by the mobile crusher is deduced by applying wave mechanics the- ory of impact mechanical system. Fatigue life analysis of the mechanism under these conditions was done by using ANSYS finite element analysis software. The calculated results show that the lowest fatigue life of small arm and small arm cylinder hinge is 1. 032 ×10^7 cycles when the mechanism works in the state of the maximum crushing depth and total damage is 0. 969. Since the safety factor of 1.03 does not meet the requirement of structure design, the structure needs to be improved.