Dynamic Characteristics Analysis of Digital Hydraulic Cylinder Controlled by Non-circular Opening Slide Valve
The slide valve integrated into existing valve-controlled digital hydraulic cylinder usually adopts a full-circular opening,resulting in high flow gain and significant hydraulic forces on the valve spool,which seriously affect the dynamic response characteristics during startup and switching.This article focuses on six typical non-circular opening value structures,calculates the flow area of each valve spool throttle groove,and determines the structural parameters of one-section stage(U,V,K shape)and two-section stage(UU,UV,UK shape)throttle groove under the same flow area.The response of the digital hydraulic cylinder with different non-circular opening slide valve under step input signals and step load disturbance were studied and compared.The simulation and experimental results show that,compared to other valve port forms,the digital hydraulic cylinder has a better response to the step input signals when the throttle groove adopts K-shaped and UK-shaped structures.Compared to UK-shaped throttle groove,when the valve core adopts the K-shaped throttle groove,the load stiffness of the digital hydraulic cylinder controlled by the slide valve is better,and the speed impact is smaller,but the working pressure of the piston rodless cavity is slower.Additionally,with UK-shaped throttle groove,the digital hydraulic cylinder controlled by the slide valve exhibits faster response speeds under the same load interference.
digital hydraulic cylinderspool structurethrottle groovenon-circular opening slide valvedynamic characteristics
万方数据
维普
