Reliability analysis of planetary reducer of shearer cutting unit
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摘要: 为研究多因素影响下采煤机截割部行星减速器的可靠性，以MG400/951-WD采煤机为研究对象，根据截齿受力分析和煤样机械性质测定结果，计算出螺旋滚筒受到的载荷曲线。将载荷施加给截割部模型进行仿真，得到行星架与行星轴的应力信息；通过构建应力-可靠度的高斯型隶属度函数，获取行星架与行星轴的可靠度信息。基于正交试验分析煤的普氏系数、采煤机牵引速度及滚筒截割深度对行星减速器可靠度的影响规律及显著性程度，得出结论：采煤机牵引速度对行星减速器可靠性的影响最大，其次是煤的普氏系数，截割深度对行星减速器可靠性的影响最小；随着煤的普氏系数增大，行星减速器可靠度降低的幅度增大，且可靠度降低趋势愈加明显；随着牵引速度和截割深度的增加，行星减速器可靠度降低的幅度趋于平缓。Abstract: In order to study reliability of planetary reducer of shearer cutting unit under influence of multiple factors, taking the MG400/951-WD shearer as research object, the load curve of spiral drum is calculated according to force analysis of pick and measurement result of coal sample mechanical properties. The load is applied to the model of cutting unit for simulation, and stress information of planet carrier and planet shaft is obtained. The reliability information of planet carrier and planet shaft is obtained by building a stress-reliability Gaussian membership function. Based on orthogonal test, influence law and significance degree of Protodyakonov coefficient of coal, traction speed of shearer and cutting depth of spiral drum on reliability of planetary reducer are analyzed. It is concluded that traction speed of shearer has the greatest influence on the reliability of planetary reducer, followed by Protodyakonov coefficient of coal, and the cutting depth has the least influence on the reliability of planetary reducer. With the increase of the Protodyakonov coefficient of coal, the decrease of the reliability of planetary reducer increases, and the decrease trend of the reliability becomes more obvious. With the increase of traction speed and cutting depth, the decrease of planetary reducer reliability tends to be gentle.
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