镐型截齿不同切削厚度下破煤受力分析

Forces analysis of conical pick in coal cutting at different cutting depths

为了深入研究切削厚度对截齿截割性能的影响,运用PFC3D离散元软件建立镐型截齿与煤壁模型,在同一截割速度不同切削厚度的情况下进行直线破煤仿真,记录其受力情况,并与理论计算结果对照,利用回归分析方法,验证了仿真结果的正确性,并对其频谱进行对比分析。结果表明,截齿破煤的平均截割力与切削厚度具有明显的线性关系,随切削厚度增大而增大;载荷波动性则为先减小后增大,在切削厚度为15~20mm时截割性能较好。

In order to further study the influence of cutting depth on cutting performance,in this paper conical pick and coal models are established through discrete element software PFC3 D. The simulation of pick linear cutting coal is finished at different cutting depth; recording the forces simultaneously. The accuracy of the simulation results is proved through comparing the numerical simulation results with theoretical calculation by means of regression analysis. Then the spectral analysis of the results is performed. The results show that the average cutting force of the conical pick cutting coal and the cutting depth have obvious linear dependence; the larger the cutting depth,the higher the force is. The load fluctuation and the percentage of coal powder first rises then falls with the increase of the cutting depth,while the cutting performance is better at the cutting depth from 15 mm to 20 mm.