液压支架供液系统压力波动特性分析

Analysis of Pressure Fluctuation Characteristics of Hydraulic Support Fluid Supply System

为提高综采工作面支架各执行机构的精确控制,以支架供液系统压力波动特性为研究起点,基于卸荷阀压力控制原理,利用SimulationX建立了支架供液系统的机液联合仿真模型。通过仿真供液流量、管路长度和支架典型动作过程,分析总结了在支架不同动作模式下的压力波动规律,并通过井下实测压力数据和搭建实验平台进行验证。结果表明:支架不动作时,压力波动在卸载阀调定范围内波动;频率受泄漏孔和管路长度影响较大,受供液流量影响较小;支架动作时,降柱压力波动最大,卸荷阀频繁开启;升柱用液量最大,系统压力下降到最低。

In order to improve the accurate control of each actuator of the support in the fully mechanized mining face,taking the pressure fluctuation characteristics of the support liquid supply system as the research starting point,a mechanical-hydraulic co-simulation simulation model of the support liquid supply system has been built employing SimulationX based on the pressure control principle of the unloading valve.By simulating the liquid supply flow,pipeline length and typical action process of the support,the pressure fluctuation law under different action modes of the support is analyzed and summarized,which is verified by the measured pressure data in underground and the experimental platform.The results show that when the bracket is not operating,the pressure fluctuation fluctuates within the setting range of the unloading valve.The frequency is greatly affected by the leak hole and the length of the pipeline,and less affected by the liquid supply flow.When the support moves,the pressure of the descending column fluctuates the most,and the unloading valve opens frequently.The liquid consumption of the rising column is the largest,and the system pressure drops to the lowest.