Xu Weipeng, Zhang Xiaodi, Gao Kuidong, Ma Shenghao
College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, 266590, Shandong Province, People's Republic of China.
China Coal Technology and Engineering Group, Shanghai Co., Ltd., Shanghai, 200030, People's Republic of China.
Sci Rep. 2024 Mar 25;14(1):7006. doi: 10.1038/s41598-024-57372-9.
The low loading rate of the thin coal seam shearer drum is a severe obstacle to the efficient mining of thin seam resources, and the auxiliary drum loading through the cowl is an effective measure to alleviate this situation. However, the working mechanism of the coal cowl still remains unclear. In this paper, with the help of the discrete element method and the modeling experiment method, the effects of coal cowl's offset distance, tilt angle and wrap angle on the coal loading rate under different loading modes of the drum are investigated; and the significance of various factors and their interactions to the drum coal loading rate is explored by designing response surface experiments. The findings show that a monotonous negative correlation between the offset distance of the coal cowl and the coal loading rate is identified, and that a smaller offset distance can effectively improve the coal loading rate of the drum. The conveying torque is significantly increased, easily inducing the drum choking, coal recycling coal over-crushing. Along with the increasing tilt angle, the rate of ejection loading decreases monotonically, and the rate of pushing loading increases first and then decreases. Coal loading rate is weakly affected by changes in coal cowl's wrap angle. The results of response surface analysis reveal that the most significant factors affecting the drum's coal loading rate are tilt angle and offset distance in ejection and pushing loading modes, respectively. The conclusions drawn here offer implications for improving the coal loading performance of the thin coal seam shearer drum, as well as certain guidance on the optimal design of coal cowl parameters.
薄煤层采煤机滚筒装煤率低是制约薄煤层资源高效开采的严重障碍，利用挡煤板进行辅助装煤是缓解这一状况的有效措施。然而，挡煤板的工作机理尚不清楚。本文借助离散元方法和模型试验方法，研究了挡煤板的偏距、倾角和包角在滚筒不同装煤方式下对装煤率的影响；通过设计响应面试验，探讨了各因素及其交互作用对滚筒装煤率的显著性。研究结果表明，挡煤板偏距与装煤率呈单调负相关，较小的偏距可有效提高滚筒装煤率。输送扭矩显著增大，易导致滚筒堵煤、煤炭循环过度破碎。随着倾角增大，抛射装煤率单调下降，推移装煤率先增大后减小。挡煤板包角变化对装煤率影响较弱。响应面分析结果表明，在抛射和推移装煤方式下，影响滚筒装煤率最显著的因素分别是倾角和偏距。本文所得结论对提高薄煤层采煤机滚筒装煤性能具有指导意义，也为挡煤板参数的优化设计提供了一定参考。
