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针对阀控缸液压系统输出位移的有极调节,提出一种基于电磁换向阀的两级并联电液位置控制系统.它由两个并联的电磁换向阀组成,其中一个电磁换向阀的A、B油口带节流阻尼.分析了该液压系统的工作原理和控制方式,并建立了液压系统数学模型.对该电液位置控制系统的输出位移控制效果和影响因素进行仿真分析,结果表明该电液位置控制系统和基于电磁比例阀的常规电液位置控制系统在阶跃信号下的输出位移基本一致,仅在稳态值附近有微幅波动.选择直径较小的阻尼孔和频率较高的电磁换向阀利于减小系统输出位移的稳态误差.通过实验对仿真结果进行了验证,结果表明,该电液位置控制系统能精确控制液压缸输出位移,满足负载位移的有级调节.
Aiming at the regulation of output displacement of valve control cylinder hydraulic system, a two-stage electro-hydraulic position control system based on electromagnetic reversing valve is proposed, which consists of two parallel solenoid directional control valves, of which one solenoid valve A and B with throttle damping.It analyzes the working principle and control method of the hydraulic system, and establishes the mathematical model of the hydraulic system.It analyzes the output displacement control effect and influencing factors of the electro-hydraulic position control system, and the result It is shown that the output displacements of the electro-hydraulic position control system and the conventional electro-hydraulic position control system based on the electromagnetic proportional valve are basically the same under the step signal and only slightly fluctuate around the steady state value. Select the smaller diameter orifice and frequency The higher electromagnetic reversing valve helps to reduce the steady-state error of the output displacement of the system.The simulation results are verified through experiments.The results show that the electro-hydraulic position control system can precisely control the hydraulic cylinder output displacement to meet the load displacement of a class adjust.