不同载荷下采煤机行走机构动态特性研究

Study on Dynamic Characteristics of Shearer Walking Mechanism Under Different Loads

以采煤机牵引部为研究对象,建立了行走机构三维数字化模型。为研究行走机构在不同牵引载荷下的动力学特性,采用impact函数法借助基于穿透深度的非线性弹簧-阻尼模型建立了基于赫兹理论的齿销啮合碰撞仿真模型。提取了标准工况下接触力剧烈波动状态曲线,并分析了其产生的原因及影响因素。通过对比分析发现了不同工况下平均接触力增幅、峰值接触力增幅及出现时间、波动维持周期、速度及加速度状况的不同。研究发现:接触力激增速率明显高于衰减速率;峰值接触力增幅低于冲击载荷增幅,平均接触力增幅大于过载增幅;短时过载50%对接触力峰值影响更大,同等程度瞬间冲击负载对接触力波动的影响持续时间更长。

In order to study the dynamic characteristics of walking mechanism under different traction loads,the haulage unit of shearer was took as research object,the digital 3D model of walking mechanism was established and the impact function method was resorted to construct the simulation model of teeth-pin contact collision based on Hertz theory with the help of the nonlinear spring-damping model based on depth of penetration.The sharp fluctuation curve of contact force under standard working conditions was extracted,and the causes and influencing factors were analyzed.Through comparison and analysis,it was found that the increase of average contact force,the increase and time of occurrence of peak contact force,the cycle of fluctuation maintenance,velocity and acceleration are different under different working conditions.It was found that the velocity of contact force increase is obviously higher than that of attenuation;the peak contact force increases less than the impact load increase,the average contact force increase is larger than the overload increase;short time overload 50%has greater influence on the value of peak contact force,the same degree of instantaneous impact has greater influence on the contact force fluctuations time.