平衡阀对掘进机液压平衡回路稳定性的影响研究

以螺纹插装式平衡阀为研究对象,分析其结构参数对掘进机截割部升降过程中液压平衡回路稳定性的影响。建立截割部的静力学方程,对截割部油缸负载进行模拟仿真,运用AMESim对平衡阀动态过程进行仿真,搭建试验台并进行平衡阀动态性能试验,利用FLUENT对平衡阀阀芯开口处流场进行仿真。结果表明:油缸负载随着截割头的升高逐渐减小,动态性能的仿真与试验结果基本一致,较小的负重、阻尼孔和弹簧预紧力,以及较大的弹簧系数,有利于系统的稳定;较大的阀芯锥角和较小的开口度,有利于减少和避免气蚀和低频抖动现象发生。

Study in Stability of Hydraulic Balance Circuit in Roadheader by Counterbalance Valve

The issue of screw-in cartridge counterbalance valve was studied , and the influence on stability of hydraulic balance circuit in the process of lifting of the roadheader cutting part by structural parameters of the valve was analyzed .The static equation of cutting section was established , and then the load of the cylinder was simulated .The dynamic process of the counterbalance valve was simulated by using AMESim , and the test rig was built to test the dynamic performance of the valve .The internal flow field of the bal-ance valve was simulated by use of the FLUENT .The results show that the load of cylinder is decreased gradually with the cutting head rise.Dynamic performance simulation and test results are basically consistent .The smaller the load of the oil cylinder , the damping hole and the spring pretightening force , and the greater the spring coefficient , the more favorable is to the stability of the system .A Smaller mouth opening and a larger conical angle of valve spool are favorable to reduce and avoid happening of phenomena of air erosion and low frequency twittering .