摘要
设计了一种电-液联控合流阀,电磁阀和换向阀内反馈压力联合控制合流阀的开启和关闭,能够实现油液的双向流动,使流量调速区间更大,执行机构动作更为迅速。基于传统方法确定阀结构参数,设计U型过渡节流槽,在Matlab中建立通流面积模型并进行计算。建立电-液联控合流阀AMESim模型并进行性能仿真,仿真结果表明,该阀控制流量范围为0~5.83×10~(-3)m~3/s,流量变化平稳;在8~11.5 mm阀芯位移区间内,合流阀压力损失随阀口开度增加而降低,当阀芯位移为11.5 mm时,合流阀压力损失为0.18 MPa。起重机卷扬系统试验结果表明,该阀最大流量达6×10~(-3)m~3/s,最大流量下压力损失为0.27 MPa;单泵供油模式下卷扬起升工况,卷筒最低稳定微动速度为1.9 r/min,启动冲击为2.1 MPa,停止冲击为2.2 MPa,启动响应延时0.7 s,停止响应延时0.8 s;卷扬下落工况,卷筒最低稳定微动速度为2.17 r/min,启动冲击为5.2 MPa,停止冲击为1.9 MPa,启动响应延时1.1 s,停止响应延时0.75 s。安装有该阀的双泵合流系统供油时,卷扬起升工况,卷筒最低稳定微动速度为2.17 r/min,启动冲击为2.5 MPa,停止冲击为0 MPa,启动响应延时0.65 s,停止响应延时0.28 s;卷扬下落工况,卷筒最低稳定微动速度为1.57 r/min,启动冲击为2.7 MPa,停止冲击为1.6 MPa,启动响应延时0.57 s,停止响应延时0.31 s。
In order to improve the efficiency and movement stability of the high power hydraulic system and reduce the hydraulic impact and energy loss,an electric hydraulic joint valve was designed. The opening and closing of the confluence valve was controlled by the joint control of feedback pressure in the solenoid valve and the reversing valve. The fluid in the valve flowed bi-directional,so the flow speed range was large and the actuator was fast. The valve structure parameters obtained by traditional calculation,throttling groove was designed as U groove,and groove flow area was calculated in Matlab.The AMESim model of the electro-hydraulic confluence valve was established and simulated,and the simulation results showed that the flow range of this valve was 0 ~ 5. 83 × 10~(-3) m~3/s,and the flow rate was stable; in 8 ~ 11. 5 mm spool displacement range,the pressure loss of the confluence valve was decreased with the opening of the valve. When the spool displacement was 11. 5 mm,the pressure loss of the confluence valve was only 0. 18 MPa,and the energy loss was small. The test results of the hoisting system of crane showed that the maximum flow rate of the valve was 6 × 10~(-3) m~3/s,and the pressure loss at the maximum flow rate was 0. 27 MPa. In single pump mode when the hoist was lifted,the minimum stable fretting speed of the reel was 1. 9 r/min,the starting impact was 2. 1 MPa,the stop impact was2. 2 MPa,the starting delay was 0. 7 s,and the stop delay was 0. 8 s; when the hoist was fallen,the minimum stable fretting speed of the reel was 2. 17 r/min,the starting impact was 5. 2 MPa,the stop impact was 1. 9 MPa,the starting delay was 1. 1 s,and the stop delay was 0. 75 s. In double pump modewhen the hoist was lifted,the minimum stable fretting speed of the reel was 2. 17 r/min,the starting impact was 2. 5 MPa,the stop impact was zero,the starting delay was 0. 65 s,and the stop delay was0. 28 s; when the hoist was fallen,the minimum stable fretting speed of the reel was 1. 57 r/min,the starting impact was 2. 7 MPa,the stop impact was 1. 6 MPa,the starting delay was 0. 57 s,and the stop delay was 0. 31 s.
引文
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