【摘要】 掘进机截齿截割煤岩时受到的载荷复杂多变，尤其截割硬岩时，强冲击载荷使截齿遭到破坏。为了研究掘进机截齿受到强冲击载荷作用时的动态响应，提出了一种强冲击载荷的描述形式，建立强冲击载荷下的截齿动力学模型，通过MATLAB/Simulink软件进行数值仿真求解，得到截齿齿体位移和速度的时间历程曲线。采用ANSYS Workbench软件建立截齿的有限元仿真模型，与动力学模型仿真得到的结果一致。仿真结果表明：最大载荷增加，振幅增幅较大；载荷变化时间延长，振幅增幅较小。设计了新的截齿齿体，与之前的截齿有限元仿真结果相比，振幅明显减小，改进后的截齿齿体能够有效改善强冲击载荷下的振动状况，为提高截齿截割硬岩的能力提供了依据。更多还原

【Abstract】 When the roadheader pick is cutting rock and coal, the load is complicated and varied. Especially when hard rock is cut, the strong impact load is likely to destroy the pick. In this article, in order to explore the dynamic response of the roadheader pick with the strong impact load, a form is proposed to describe the strong impact load, and the dynamic model of the pick with the strong impact load is set up. The numerical simulation is carried out by MATLAB/Simulink, so as to identify the time history curve of the pick’s displacement and velocity. ANSYS Workbench is used to construct the pick’s finite-element simulation model. The results are consistent with those obtained from the dynamic simulation model. It is shown that when the maximum load increases, the vibration amplitude increases greatly; when the time in load change is prolonged, the vibration amplitude increases slightly. Besides, a new pick body is designed. Compared with the results obtained from the previous pick’s finite-element simulation, the new pick body’s vibration amplitude decreases obviously. Therefore, the improved pick body enjoys better vibration with the strong impact load. This study provides basis for improving the pick’s ability of hard-rock cut.更多还原