非对称液压缸EHA专用流量匹配阀的设计与分析

Design and Analysis of EHA Special Flow Matching Valve for Asymmetric Hydraulic Cylinder

针对泵控电动静液作动器(EHA)非对称液压缸流量不匹配问题,提出一种采用流量匹配阀解决系统流量不平衡的方案。建立EHA系统AMESim模型,分析流量匹配阀在四象限工况下和不同负载条件下对EHA系统性能的影响。仿真结果表明:在四象限工况下液压缸压力振幅总体小于0.02 MPa,系统运行稳定;在第一象限工况下,流量匹配阀的内阀芯位移振幅在0.3 mm左右波动,液压缸压力振幅小于0.01 MPa,负载变化对系统稳定性无明显影响。与采用液控单向阀方案相比,系统压力达到稳态用时缩短53.1%,最大行程时压力损失有效减少35.9%。所设计的流量匹配阀不仅解决了非对称液压缸流量不平衡的问题,而且对泵控非对称液压缸EHA的优化设计具有借鉴意义。

Aiming at the flow mismatch problem of pump controlled EHA asymmetric cylinder,a solution to the imbalance of system flow by using flow matching valve was proposed.By building EHA system AMESim model,the influences of the flow matching valve on the performance of the EHA system under four-quadrant operating conditions and different load conditions were analyzed.Simulation results show under the four-quadrant working condition,the hydraulic cylinder pressure amplitude is generally less than 0.02 MPa,the system operates stably;in the first quadrant,the displacement amplitude of the spool in the flow matching valve fluctuates around 0.3 mm,hydraulic cylinder pressure amplitude is less than 0.01 MPa,load changes have no obvious impact on system stability.Compared with the hydraulic control check valve solution,when the system pressure reaches steady state,the time is decreased by 53.1%,and the pressure loss at the maximum stroke is effectively reduced by 35.9%.The designed flow matching valve not only solves the problem of unbalanced flow of asymmetric cylinders,but also has reference significance for the optimization design of pump-controlled asymmetric hydraulic cylinders EHA.