新型大流量高水基电液比例换向阀的设计和研究

摘要

针对煤矿井下液压支架系统液压冲击大的问题,设计了一款新型大流量高水基电液比例换向阀.介绍了所研制的电液比例换向阀的结构及工作原理,并利用AMESim仿真软件搭建了该阀的仿真模型.研究表明,在斜坡信号输入的情况下,该阀能实现正常换向且主阀口开口大小与输入信号成正比例趋势;在阶跃信号输入的情况下,验证了阀的稳定性并分析了阻尼孔和主阀芯末端锥度对阀性能的影响,发现设置合适的阻尼孔直径有利于提高阀的响应速度,合理选择主阀芯末端锥度大小可以提高阀的稳定性.%Aiming the hydraulic impact problem of the coal mine hydraulic support system,we design a new large flow and high water-based electro-hydraulic proportional directional valve.This study introduces the structure and working principle of the valve and uses simulation software AMESim to build the model.The simulation results show that:in the case of the ramp signal input,the valve can realize normal reversing and the main valve port opening size is proportional to the input signal;in the case of the step signal input,the stability of the valve is verified through the model and the influences of the damping diameter and the taper at the end of the main spool on the dynamic characteristics of the valve is analyzed.A suitable design of the damping diameter can improve the response speed of the valve and can improve the stability of the valve by selecting the taper of the end of the main spool.