Research On The Ultrahigh Pressure And Large Flow Rate Electro-Hydraulic Proportional Cartridge Relief Valve

Heavy die forging press is one of import symbols of National industrial strength,which is the key production equipment for the die forgings in the field of aviation,aerospace,ship,petroleum,chemical and so on.Ultrahigh-pressure and large-flow cartridge electro-hydraulic proportional relief valve is the core component of the hydraulic system of heavy die forging and pressing equipment.Until now,the key component is entirely dependent on the import.The research of this subject is of great significance for our country in the respect of independent technological innovation and get rid of foreign technical blockade.This paper takes ultrahigh-pressure and large-flow cartridge electro-hydraulic proportional relief valve as research object,and completed principle scheme design,simulation analysis,sample valve trial-produce and experimental study.The paper mainly includes the following contents:On the basis of deeply analyzing the related domestic and international research results,and the usage requirements,the main stage,pilot stage,and electrical-mechanical principle scheme design is completed.Then,the key dimensions and components are calculated and designed.In order to study the mechanism of the cavitation inside the valve and the method to improve it,a commercial CFD simulation software Fluent is used to simulate the flow field of the valve.The influence of the half cone angle and the inlet pressure on the cavitation is mainly studied,and a method for improving the flow path is proposed.From the simulation,it is found that the cavitation of the valve is improved to a certain extent.In order to verify the feasibility of the principle scheme of the valve and the rationality of the parameters,the modeling and AMESim-Simulink co-simulation analysis of the valve is completed.Then,the fuzzy PID controller is designed by the Fuzzy toolbox to overcome the traditional PID controller’s weakness.The results show that,overshooting is decreased and response speed is improved.To explore the effects of the parameters on the dynamic and static characteristics of the valve,the simulation of dynamic and static characteristics is carried out according to PRC’s Machinery Industry Standard about relief valve test(JB/T 10374-2013).The influence of the parameters on the dynamic and static characteristics of the valve is obtained which provides a theoretical basis for the follow-up research and optimization.In order to study the pressure-resistance characteristics,sealing characteristics of the valve,the pressure-resistance test including the design of measurement and control system,the PLC and Lab VIEW program is carried out.The results show that,the characteristics have good performance.In order to study the dynamic and static characteristics of the valve and to verify the accuracy of the simulation model,a preliminary dynamic and static test is completed.From this test,the initial dynamic and static characteristics of the valve are obtained and the accuracy of the simulation model is verified.Last,some conclusions of this paper are shown,and the further research content are put forward.