To study the coal drop characteristic of shearer drum under different operating conditions,using the MG500/1180-WD shearer model as a research object,the EDEM discrete element simulation software was used to establish a three-dimensional simulation mnodel.With the consideration of the effect of the factors,such as coal fragmentation and the roof pressure on the performance of shearer cutting,the dynamic process of shearer cutting was investigated.Using single factor test,the particle's trajectory during the cutting process was analyzed.Under different cutting depths and rotational speeds,the impact of shearer coal loading rate,drum loads and the average velocity curve of particles within the drum envelope range were analyzed.The results show that the coal loading rate of shearer increases with the speed first and then decreases,and increases with the cutting depth;three directions loads of drum decrease with drum speed increases and increase with the cutting depth increases;and the cutting rate energy consumption increases with speed and cutting depth increases.Low speed and large cutting depth of drum may increase the rate of shearer coaling.In order to improve the shearer cutting efficiency and reduce consumption,with the same level of shearer coaling rate,the cutting depth can properly be reduced.The results provides a reference for improving the shearer cutting efficiency.%为研究不同工况参数下采煤机滚筒的落煤特性,以MG500/1180-WD型号采煤机为研究对象,采用EDEM离散元仿真软件建立三维仿真模型,综合考虑煤岩块度、顶板压力对采煤机截割性能的影响,研究采煤机截割煤岩的动态过程,利用单因素试验法分析截割过程中煤岩颗粒的运动轨迹,研究不同截深、转速对采煤机装煤率、滚筒三向载荷、截割比能耗的影响以及滚筒包络范围内颗粒平均速度的变化曲线.结果表明:采煤机装煤率随转速增大先增后减的趋势,随截深增大而增大;滚筒三向载荷随转速增大而减小,随截深增大而增大;截割比能耗随转速、截深增大而增大.综合考虑选择低转速、大截深的滚筒可以在一定程度上提高采煤机装煤率;同时为提高采煤机的截割效率,减小耗损可以在保障装煤率的前提下,适当减小截深.研究结果为采煤机高效截割提供了改进参考.
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