掘进机臂架的高频激振特性研究

High-Frequency Excitation Characteristics of Roadheader Boom

振动式掘进机臂架的响应频率和振幅是影响掘削效率的关键因素,由于目前机械惯性式激振系统结构复杂、响应频率及振幅较低的问题,提出一种采用转阀的臂架高频激振系统方案,并对掘进机臂架系统的激振特性进行研究。通过在ADAMS与AMESim仿真软件中分别建立臂架激振系统动力学模型和电液激振模型,仿真分析得出系统压力、激振阀阀口开度、激振频率、负载质量与臂架激振响应特性的关系;并搭建臂架激振系统试验平台,对仿真结果进行验证。研究结果表明,提高系统压力、增大激振阀阀口开度、减小负载质量可提高臂架响应振幅。随着激振频率的增大,臂架响应振幅先迅速下降,高于50Hz后,基本不再变化。为掘进机臂架系统的高频激振特性调节及控制提供依据。

A high frequency vibration-exciting system of roadheader boom based on rotary valve is proposed. Based on ADAMS and AMESim simulation softwares, the dynamic model of the boom and the model of electro - hydraulic excitation are established. The influence of the excitation frequency, system pressure, opening degree of the excitation valve and different load mass on the excitation response characteristics of the boom are simulated and analyzed. Simulation results are verified by building the test platform of the boom excitation system. The results show that increasing the pressure of the system, increasing the opening of the valve port and reducing the load quality can increase the response amplitude of the boom. With the increase of the excitation frequency under 50Hz, the amplitude of the boom is decreased rapidly; when the excitation frequency is high than 50Hz, the rate of decline becomes slow.