螺旋滚筒截割顶板工况的数值模拟

根据截齿截割机理和有限元理论,利用ANSYS/LS-DYNA软件建立了螺旋滚筒截割顶板的煤岩耦合模型,得到截割过程中螺旋滚筒受到的冲击载荷,并验证其载荷的可靠性;通过对螺旋滚筒的动力学分析,找出其在工作过程中的应力分布规律。研究表明:螺旋滚筒的最大应力主要集中在合金头的齿尖局部接触区域、齿柄头部的轴肩处以及截齿齿座根部,当滚筒转速相同时,煤岩受到的应力增加幅度随牵引速度的增加先增大随后逐渐减小;若牵引速度不变时,煤岩受到的应力减小幅度随滚筒转速增大而逐渐变小。分析结果为薄煤层采煤机螺旋滚筒的结构设计及其截割性能的提高提供了重要参考。

Numerical Simulation of Cutting Roof Condition of Spiral Drum

According to the cutting mechanism and the finite element theory,a coal rock coupling model of spiral drum cutting roof is established by using the ANSYS/LS-DYNA software,the impact load in the spiral drum cutting process is obtained,and the reliability of the load is verified.According to dynamic analysis of spiral drum,the stress distribution law in the work process was found.Research shows that the maximum stress of the spiral drum mainly concentrated in the shaft shoulder tip local contact area,the alloy head and tooth root block,when the drum at the same speed,the coal rock subjected to stress increases with increasing traction speed firstly and then decreases gradually.If traction speed at constant stress of coal rock was decreased gradually,reduced with the increase of rotational speed of cylinder.The analysis results provide an important reference for the structural design and cutting performance improvement of the spiral drum of thin coal seam shearer.