滚珠丝杠压扭型2D电液比例方向阀静态特性研究

发布时间：2018-04-19 13:05

本文选题：电液比例方向阀 + 压扭联轴器　；参考：《农业机械学报》2017年08期

【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。
[Abstract]:Aiming at the shortage that the flow rate of direct-acting electro-hydraulic proportional directional valve can not be large due to the magnetic saturation of proportional electromagnet, a ball screw 2D electro-hydraulic proportional directional valve is proposed.Through static analysis, the magnification factor of the valve is 20, which can overcome the influence of nonlinear factors such as friction or clamping force.The experimental results show that the larger the spiral angle and the force transfer radius of the pressure-torsional coupling, the more obvious the effect of pressure-torsional amplification, and the effect of changing the frequency of the vibration amplitude ratio on the improvement of the static characteristics of the valve.The static characteristics of the valve are improved obviously by increasing the spiral lift angle and force transfer radius. Under the pressure of 7 MPa system, the hysteresis of the valve does not exceed 3, and the dead zone is about 0.5 ~ 28 MPa system pressure.The flow rate can reach 190 L / min, the dead zone is about 2.8, the hysteretic loop is less than 5 and the lead level leakage is about 0.2 L / min.The theoretical research and experimental data show that the valve has better static characteristics and practical engineering value than the traditional straight valve.
【作者单位】：浙江大学城市学院机械系;浙江工业大学特种装备制造与先进加工技术教育部重点实验室;
【基金】：国家自然科学基金项目(51605430)
【分类号】：TH137.52

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