滚筒随机载荷下采煤机行走机构齿销啮合力研究

Study on Meshing Force of Tooth Pin of Shearer Walking Mechanism under Random Load of Drum

滚筒载荷是采煤机外部激励的主要来源,滚筒载荷作用下齿销啮合力波动频繁,行走机构容易发生疲劳破坏。采用直接分析法计算了采煤机滚筒载荷,研究了滚筒随机载荷下行走机构齿销啮合力,并探究了瞬时冲击和短时过载2种状态下齿销啮合力的变化规律。研究结果表明:滚筒载荷下齿销啮合力频繁发生突变,并呈周期性变化,变化周期与滚筒载荷变化周期和单齿啮合周期有关,其值约为2.78 s;销齿啮合力最小值为180.5 kN,最大值为238.7 kN,波动率为32.2%;瞬时冲击和短时过载会导致齿销啮合力激增,但只在载荷作用期间对行走机构力学特性产生影响,作用结束后齿销啮合力值和波动周期恢复正常水平。

The drum load is the main source of external excitation of the shearer, the tooth pin meshing force fluctuates frequently under the action of the drum load, and the walking mechanism is prone to fatigue damage. The direct analysis method was used to calculate the drum load of the shearer, the tooth pin force of the walking mechanism under the random load of the drum were studied, and the change law of the tooth pin force under the two states of instantaneous impact and short-term overload was explored. The results show that the tooth pin meshing force under the drum load frequently mutates and changes periodically, and the change period is related to the drum load change cycle and the single tooth meshing cycle, and its value is about 2.78 s. The minimum pintooth meshing force is 180.5 kN,the maximum value is 238.7 kN, and the volatility is 32.2%. Instantaneous shock and short-term overload will cause a surge in tooth pin meshing force, but only during the load action on the mechanical properties of the walking mechanism, after which the tooth pin meshing force value and fluctuation period return to normal levels.