Simulation on Dynamic Characteristics of Cutting Unit for Thin Seam Shearer
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摘要: 为研究某薄煤层采煤机截割部截割煤岩时的动态特性,建立了该型采煤机截割部的刚柔耦合模型,根据采煤机主要技术参数及其工作机构截齿排列方式,基于实际工况计算出截割韧性煤时采煤机截齿受到的瞬时冲击载荷,并将其作为外部激励施给模型进行仿真。通过仿真得到截割部的动态响应,发现了采煤机截割部设计上存在的问题:如滚筒在垂直方向上振动较为剧烈,摇臂壳体伸出端颈部动应力较大等;识别出系统的主要模态参数以及容易被激发的振型,发现滚筒及壳体模态动能较大。根据仿真结果对壳体进行了局部结构改进,改进后壳体的力学性能得到显著改善,提高了壳体工作的可靠性。Abstract: In order to investigate dynamic characteristics of a thin seam shearer,the rigid-flexible coupled model of shearer cutting unit was established. According to the major technical parameters of shearer and the arrangement of cutting pick,the transient load of cutting pick under actual work condition was calculated out and applied in the model of shearer cutting unit. The dynamic characteristics of shearer cutting unit were obtained through the numerical simulation. It was found that the drum vibration is more intense,shell out of the side neck has large dynamic stresses. The modal parameter and the easily excited modal shapes of the system were recognized,and found that the drum and shell have high mode kinetic energy. According to analysis results,the design of the shell structure was optimized,and mechanical properties and the reliability of the cutting unit shell were significantly improved.
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Key words:
- acceleration /
- calculations /
- computer simulation /
- design /
- dynamic characteristic
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