采煤机摇臂惰轮轴疲劳寿命分析

Fatigue Life Research of the Idler Shaft on Rocker Arm Shearer

为研究采煤机摇臂惰轮轴疲劳寿命,建立惰轮传动系统动力学模型,分析惰轮轴载荷特性;利用自主研制的惰轮轴载荷测试系统,通过无线应变模块采集测试数据,获得采煤机斜切进刀时摇臂惰轮轴载荷;运用斜切截割最大载荷研究惰轮轴疲劳寿命。研究结果表明:采煤机斜切工况下,惰轮轴X向的最大载荷为33.90 k N,Y向最大载荷为35.83 k N,惰轮轴固定轴承的两个端面处应力最大,最先发生疲劳破坏的位置在固定两个轴承的轴肩处。研究结果为摇臂惰轮轴实时载荷测试提供了新方法,为采煤机摇臂结构载荷和力学特性研究提供理论依据。

In order to study the fatigue fife of idler shaft on rocker arm shearer, a dynamic model of the idler shaft drive system was built, analysised the load properties of idler shaft ; used the load testing system of idler shaft which we invented , and through the wireless module to collect the test data , obtainer the data when coal winning machine under the oblique cutting condition; studied the fatigue life of idler shaft under the largest load. The results show that the largest load of 33.90 kN in X direction, the largest load of 35.83 kN in Y direction when coal winning machine under the oblique cutting condition, the largest stress is on the surface of idler shaft which fixed two bearings, and the location which fixed two bearings was fatigue failure at first. The results of the study provide a new way for the idler shaft real-time load test and provide theoretical foundation for the mechanical and the load on rocker arm structure of shearer.