摘要
针对直动式电液比例方向阀因比例电磁铁磁饱和造成流量无法做大的不足,提出了一种滚珠丝杠型2D电液比例方向阀。该阀利用压扭放大驱动技术放大电磁铁推力,通过静力分析,其放大系数为20,能克服摩擦力或卡紧力等非线性因素的影响。实验结果表明:压扭联轴器螺旋升角和力传递半径越大,压扭放大效果越明显;改变颤振幅值比改变频率对改善阀的静态特性影响明显;增大螺旋升角和力传递半径对阀的静态特性改善明显,在7 MPa系统压力下,该阀的滞环不超过3%,死区约为0.5%;28 MPa系统压力下,流量可达190 L/min,死区约为2.8%,滞环小于5%,导控级泄漏约为0.2 L/min。理论研究与实验数据说明:该阀较传统的直动阀具有良好的静态特性和工程实用价值。
Traditional direct-drive proportional directional control valve is usually actuated by the proportional solenoid. However,it is very difficult to improve the flow,because of the magnetic saturation of the proportional solenoid itself. Therefore,a new 2D electro-hydraulic proportional directional control valve was proposed. A new ball-screw type axial compression and torsion coupling as an important part was designed in this valve,which was used to amplify the driving force of the solenoid. In the theoretical analysis,the amplification coefficient was 20. It was to overcome the friction force and clamping force or other nonlinear factors. The experimental results showed that the larger helix angles and the force transfer radius of the compression and torsion coupling were,the more obvious the effect of pressure-torsion was; changing of flutter amplitude compared with flutter frequency obviously improved the static characteristics of the valve; the static characteristics of the valve were improved obviously with the increase of the helix angle and the force transfer radius. Under pressure of 7 MPa,the maximum hysteresis of the valve did not exceed 3%,and the dead zone was about 0. 5%; under pressure of 28 MPa,the flow rate was up to 190 L/min,the dead zone was about 2. 8%,the maximum hysteresis was less than 5%,and pilot level leakage was about 0. 2 L/min. The theoretical analysis and experimental data indicated that the valve had good static characteristics compared with the traditional valve and practical engineering applications.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2017年第8期368-375,共8页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金项目(51605430)
关键词
电液比例方向阀
压扭联轴器
滚珠丝杠型
静态特性
electro-hydraulic proportional directional valve
compression and torsion-coupling
ball-screw type
static characteristics
