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针对目前采煤机摇臂普遍存在的经验设计及过设计问题,基于商用有限元软件,建立MG500/1180-WD采煤机摇臂有限元模型,利用Lanczos法提取低阶模态。通过试验模态分析,以固有频率一致性作为判定指标,对摇臂有限元模型合理性进行验证。考虑摇臂内部齿轮传动系统啮合谐波频率成分,对摇臂进行区间频率谐响应分析。以壁厚为设计变量,以动态特性改善及轻量化为原则,提出摇臂结构改进方案。结果表明:采煤机摇臂主要振动形式为电动机壳体及行星头的弯曲扭转振动;摇臂过设计主要集中于壳体中部;在满足内部传动系统安装位置要求下,首先满足轻量化及良好动态特性要求,后对采煤机进行强度刚度校核及疲劳分析。本研究可为采煤机摇臂动态设计提供依据。
Aiming at the prevailing experience design and design problems of the current shearer rocker arm, based on the commercial finite element software, the finite element model of MG500 / 1180-WD coal winning rocker arm was established and the low order mode was extracted by Lanczos method. Based on the experimental modal analysis, the rationality of finite element model of rocker arm is validated by the coincidence of natural frequencies. Considering the inner gear transmission system of the rocker arm meshing harmonic frequency components, the range-frequency harmonic response of the rocker arm is analyzed. Taking the wall thickness as the design variable, taking the dynamic characteristic improvement and the light weight as the principle, the paper presents the improvement scheme of the rocker arm. The results show that the main vibration mode of shearer arm is bending torsional vibration of the motor shell and planetary head. The design of the rocker arm is mainly concentrated in the middle of the shell. Under the requirement of the internal drive system installation position, the lightweight and good Dynamic characteristics of the requirements, after the shearer strength and stiffness check and fatigue analysis. This study can provide the basis for the dynamic design of shearer rocker.