滚轮压扭型2D电液比例方向阀特性分析

Characteristic Analysis of 2D Electro-hydraulic Proportional Directional Valve with Roller Thrust-torsion Coupling

设计了一种滚轮式双向压扭联轴器,以球型滚轮代替滚动轴承,既简化了压扭联轴器的加工,也减小了摩擦阻力;可实现比例电磁铁直线运动和阀芯旋转运动的转换,同时放大阀芯旋转扭矩,并将其与双向比例电磁铁和2D方向阀共轴联接,组成一种压力高、流量大、结构简单的位置反馈型2D电液比例方向阀。进而建立了该阀的数学模型,应用Matlab软件对阀的特性进行了仿真分析。实验结果表明:滚轮型压扭联轴器具有良好的输入输出特性,颤振补偿下空载滞环可达1.0%;系统压力为21 MPa时,包括电磁铁滞环在内,该阀流量滞环小于5%,且线性度和重复特性良好;对应-3 d B、-90°的频宽约为12 Hz;阀的阶跃响应上升时间约为0.45 s,无超调量。

A new kind of roller thrust-torsion coupling was designed with low friction and simple structure,the linear movement of proportional electromagnet armature can be changed into the rotation of the spool movement,at the same time,the rotary torque of spool was enlarged. With large flow and simple structure,the new kind of 2D electro-hydraulic proportional directional valve（ EPDV） mainly consists of roller thrust-torsion coupling and electromagnet armature,which has position feedback. Based on the principle of the roller compression-torsion coupling,the mathematical model was established,and2 D valve was simulated by the software Matlab. Direct and pilot experiment results show that,with good input and output characteristics,the high pressure and large flow control can be achieved by this valve,the no-load hysteresis is 1. 0%,flow hysteresis is under 5% when system pressure is at 21 MPa,and the linearity and repeating characteristic are all good. Frequency width is improved to about 12 Hz at- 3 d B and- 90°and rising time of step response is about 0. 45 s. The valve＇s static and dynamic performance is good,and simulation analysis and experimental results are basically same,which lay foundation for its engineering application.