薄煤层采煤机行星机构强度分析

Strength Analysis of Thin Seam Shearer Planetary Mechanism

基于刚柔耦合多体系统动力学和疲劳累积损伤理论,通过多软件构造协同仿真平台建立了以行星机构为柔性件的薄煤层采煤机多体模型。通过对模型进行动力学仿真分析发现:截割部行星架主要发生弯曲变形和扭转变形,主应力值均在其材料的许用应力范围之内,强度方面满足要求,可靠性较高;牵引部行星架输出端花键根部与退刀槽连接处受力较大,存在局部应力集中现象。对动力学仿真结果中行星机构关键节点的原始载荷谱进行雨流计数和外推处理后,分析其疲劳寿命,得到了疲劳寿命循环次数和疲劳寿命云图。分析结果为研究复杂条件下结构的动应力分布和疲劳寿命提供了新的方法。

Based on rigid--flexible coupling multibody dynamics and fatigue cumulative damage theory, the rigid--flexible coupling virtual prototype model of shearer that taking the planetary mecha- nism as flexible member is established by multi--software co--simulation platform. Through the dy- namics simulation analysis of the model found that, the planetary carrier of cutting part occurred main- ly bending and torsional deformation. The principal stress values are in the range of its allowable stress, meeting the requirements in terms of strength, the reliability is high. A larger forces on the root of the output terminal of planetary carrier of traction part and undercut connections, existing the phenomenon of local stress concentration. After rain flow counting and extrapolation processing of the original load spectrum of the simulation results on the dynamics of planetary mechanism on its key point, the fatigue life is analyzed, the number of cycles of fatigue life and fatigue life cloud are got. A new method for the study of dynamic stress distribution and fatigue life under conditions of complex structure is provided by the result of analysis.