三芯随动式水基比例阀位置跟随特性

高压大流量水基比例方向阀是煤矿液压支架实现智能化的核心控制元件，关系到整个工作面的精准控制效果和支护安全性。提出一种新型三芯随动式水基比例阀，解决现有水基比例阀难以满足液压支架高压大流量工况及难控制的问题。通过理论分析、AMESim建模仿真及试验对比的综合分析方法，验证三芯随动原理的可行性，探索该阀的位置跟随特性。结果表明：新型水基比例阀具备快速响应能力，额定工作条件下的全行程阶跃响应开启时间为84 ms，关闭时间约为35 ms；斜坡连续控制时，摩擦效应导致三芯随动机构位置跟随效果不佳，小阶跃步进控制能较好克服摩擦效应，使比例阀展示良好的位置跟随特性。研究成果为液压支架高压大流量水基比例阀设计提供参考，同时丰富了水基比例阀类型。

Position Control Characteristics of the Water Proportional Valve with Three-core Follow-up Mechanism

The high-pressure and large-flow water proportional directional valve is the key control element for the realization of intelligent hydraulic support in the coal mine. It is related to the precise control effect and support safety of the entire working face. A new water proportional directional valve with three-core follow-up mechanism is proposed to solve the problem that the existing water proportional valve is difficult to meet the high-pressure and large-flow working conditions of the hydraulic support and is hard to control. Through the comprehensive analysis method of theoretical analysis, AMESim modeling simulation and experimental comparison, the feasibility of the three-core follow-up mechanism is verified, and the following-up characteristics of the valve are explored. The results show that the new water-based proportional valve has fast response capability. The full stroke step response under rated working conditions has an opening time of 84 ms and a closing time of about 35 ms. The position following effect of the new valve is not good in slope control model because of the friction effect of the three-core servo mechanism. However, the small-step stepping control mode can much better deal with the friction effect, under which the proportional valve exhibits good position following characteristics. The research provides a reference for the design of high-pressure and large-flow water-based proportional valves for hydraulic supports, and at the same time enriches the types of water-based proportional valves.