采煤机截割部垂直方向振动分析

摘要

The impact of the load on the shearer is mainly transmitted through cutting part. In this paper, in order to get the vertical steering vibration characteristics of the cutting part of the drum shearer, the working condition of coal mining machine is simplified. A simplified vertical steering model and the simplified vibration model of the whole cutting part of shearer are established. The vertical steering vibration process of the cutting unit is simplified into a single freedom and one forced vibration system under harmonic excitation. The dynamic response of the cutting part under sine excitation is obtained by using Matlab/Simulink for modeling and simulation. The influence of the support rigidity and damping of the high oil cylinder on the vertical steering vibration characteristics of the cutting part is analyzed. The results show that the damping of the cylinder can reduce the vibration of the system and the stability of the swing process of cutting the part is improved.%采煤机负载对采煤机的振动冲击主要通过截割部进行传递.为得到滚筒式采煤机截割部的垂直振动特性,对采煤机工况进行合理简化,建立了采煤机截割部垂直简化模型,进而建立了采煤机截割部整体机构的振动数学模型.将采煤机截割部垂直振动过程简化为在简谐激振力作用下的单自由受迫振动系统,运用Matlab/Simulink进行建模仿真,得到截割部在正弦激振下的垂直摆动动态响应,分析了调高油缸的支撑刚度与阻尼对截割部垂直振动特性的影响.结果表明,增大调高油缸的阻尼可以减轻系统的振动,提高截割部调高过程的稳定性.