2D电液伺服流量阀特性研究

Characteristics of Airborne 2D Electro-hydraulic Servo Flow Valve

摘要:

提出了2D电液伺服流量阀设计方案，应用磁栅霍尔传感器检测比例旋转电磁铁的角位移，并与输入控制信号对比，形成角位移信号闭环反馈；采用变传动比拨杆拨叉驱动机构，结合2D控制技术将旋转电磁铁角位移比例转换为阀芯轴向位移，斜槽敏感通道形成位置闭环反馈，提高了其控制精度和抗污染能力。建立了该阀的数学模型，对整个系统进行了仿真分析，并设计样机，进行了实验研究，实验结果表明：当工作压力为35MPa、阀芯行程为0.8mm时，其频宽约为120Hz,阶跃响应5ms，6mm通径阀流量达60L/min，且其质量仅为同级别阀的1/3左右，适用于机载液压系统。

Abstract:

With the widespread application of servo system in major equipment of industrial, military, aerospace and other important areas, there is a great demand for the electro-hydraulic servo flow valve which can response fast under the condition of high pressure and high flow. So the novel design project plan of 2D (two-dimensional) electro-hydraulic servo flow valve was made. The angular displacement of the proportional rotary electromagnet was detected by HALL sensor in this project, and compared with the input control signal to realize closed-feedback of angular displacements signal. Variable transmission ratio lever-fork structure was adopted. In order to enhance the valves control precision and anti-pollution capability, the rotary electromagnet angular displacement was proportionally converted into spool axial displacement by 2D technology which realized a closedfeedback of the chute sensitive channel. The mathematical model of the valve was established, and the simulation analysis was carried out on the whole system. Based on the analysis of the valves mathematical model and system parameters, sample equipment was manufactured and the experimental study was carried out. When the system pressure was 35MPa and the spool displacement was 0.8mm, the valve’s bandwidth was about 120Hz, dynamic response time was about 5ms, and the flow rate of 6mm spool diameter was 60L/min. The valve had a small and simple bodies, its weight was only one third of the same level valves. It also had low power consumption, and easy to realize closed-loop control, its static and dynamic performance was superior; therefore, the research result showed that it worked very well for airborne hydraulic system.