The Innovative Study Of The Hydraulic Synchronous Valve

In the modern mechanical engineering and modern control engineering the hydraulic technology is widely used and has become a basic engineering technology and has been acted as one of the important marks of the measure of the industrialization level. It is widely used in machinery manufacturing, construction machinery and chemical machinery, etc. so the hydraulic synchronous controlling system becomes one of the hot topics of domestic and international researchs. The hydraulic synchronous controling methods have the closed loop and the open loop, and the hydraulic synchronous control with hydraulic synchronous valve is the most basic form control in the open loop synchronous control, with mang merits such as simple structure, easily controlling and withstanding greater partial load.Now the typical structures of the synchronous valve have two types of reversing piston and hook and its structure have not changed at all for decades, with some shortcomings such as the complicated structure, large, low accuracy and poor performance. Scholars at home and abroad have done many studies, but failed to change its basic structure. For this kind of synchronous valve, we will improve the performance of the static and dynamic synchronous valve by increasing the valve core diameter to increase the force area with pressure feedback, but the increase of the valve core diameter will increase the core quality and friction, so as to decrease the synchronous valve performance, and will also increase the synchronous valve's volume;For these problems, this thesis found the root of the problem through the mathematical model analysis of the reversing piston synchronous valve and design the completely new structure of the hydraulic synchronization valves for the purpose of reducing the volume and enhancing the performance.In this paper the new type synchronous valve classificated into the new type flow diverter valve and the new type flow collector valve. The new type flow diverter valve is used as the main researching object for analysis, by the mathematical modeling and simulation analysis with AMESim software. Through the mathematical modeling analysis, it can be seen that the main parameters influencing the new type flow diverter valve's performance are the fixed orifice diameter, the force area with pressure feedback and the total quality of the valve core, the pressure feedback piston and spring and I found that there is a responsive dead zone in the moving process of the valve core, and it can not be removed. Through the simulation analysis, it can be seen that the speed synchronous error is less than1%, and has increased significantly comparing with that of the reversing piston synchronous valve (FJL-B20H type). By exploring the fixed orifice diameter and the pressure feedback piston diameter on the influence of the new type flow diverter valve's dynamic performance with the AMESim simulation software, I get a group of the practical optimizationalparameters. The improved speed synchronous error of the improved flow diverter valve is less than0.6%; In the load pressure difference for30MPa, the dynamic response time of the improved flow diverter valve is0.475seconds, and its volume is103.6x104mm3and is only about half of the volume (207.36x104mm3) of the reversing piston synchronous valve (FJL-B20H type), so this thesis has achieved the expected purpose of improving performance and reducing the volume.