摘要
现有阀控数字液压缸中集成的滑阀通常采用全周开口,其流量增益大、阀芯所受液动力大,严重影响数字液压缸的起动和切换时的动态响应特性。针对6种典型非全周开口滑阀结构,计算了各阀芯节流槽过流面积,确定了在过流面积相同的情况下,一级(U、V、K形)和二级(UU、UV、UK形)节流槽的结构参数;比较了不同结构形式的非全周开口滑阀的数字液压缸在阶跃信号下的响应和阶跃负载扰动的响应。仿真及实验结果表明:相较其他阀口形式,节流槽采用K形及UK形结构时,数字液压缸在阶跃输入信号下的响应较好;而相较于UK形节流槽,阀芯采用K形节流槽时,滑阀控制的数字液压缸的负载刚度更好,速度冲击更小,但活塞无杆腔建立工作压力较慢;阀芯采用UK形节流槽时,滑阀控制的数字液压缸的在相同负载干扰下响应速度更快。
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.
作者
魏列江
王琳
展鹏
单乐
都志航
WEI Liejiang;WANG Lin;ZHAN Peng;SHAN Le;DU Zhihang(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050;Key Laboratory of Advanced Pumps,Valves and Fluid Control System of the Ministry of Education,Lanzhou University of Technology,Lanzhou,Gansu 730050)
出处
《液压与气动》
北大核心
2024年第9期1-9,共9页
Chinese Hydraulics & Pneumatics
基金
国家重点研发计划(2022YFB3403003)
甘肃省教育厅高校科研创新平台重大培育项目(2024CXPT-09)。
关键词
数字液压缸
阀芯结构
节流槽形式
非全周开口滑阀
动态特性
digital hydraulic cylinder
spool structure
throttle groove
non-circular opening slide valve
dynamic characteristics
