Research on two-step throttle characteristics of double-rotation valve port for hydraulic servo joint

• 来源期刊: 高技术通讯（英文版）
• 年，卷（期）: 2021,（1）
• 页码范围: 68-75
• 页数: 8页
• 语种: 英文
• DOI: 10.3772/j.issn.1006-6748.2021.01.009

摘要

The hydraulic robot with large output torque is widely used in industry,however,its precision is not high.In order to solve this problem,this paper presents a new structure of rotary valve with double-rotation valve port,which can improve the two-step throttle characteristics of the valve port,reduce the cavitation phenomenon of the valve port,and increase the output accuracy of the hydrau-lic servo joint.Firstly,the internal flow field of the rotary valve is simulated by using the sliding grid technology of FLUENT software,and the changing rule of the throttle position in the working process of the structure is analyzed.Secondly,compared with the simulation results of rotary valve with sin-gle-rotation valve port,it is shown that the two-step throttle characteristics of the structure are less affected by the change of the opening of the rotary valve,and the cavitation index of the joint valve port is reduced.Finally,the influence of the rotation speed of the valve core,oil supply pressure and key dimension of valve core on throttle characteristics of rotary valve have been analyzed.