Study On Simulation And Performance Optimization Of The Inverse Proportional Pressure-relief Cartridge Valve

As the combination of electro-hydraulic proportional technology and hydraulic of walking machinery technology,proportional pressure-relief cartridge valve has the characteristics of small volume,high reliability and good control performance.With the rapid growth of hydraulic products and the continuous development of electric proportional control technology,proportional relief cartridge valve has broad application prospects.At present,the performance of such products is generally poor,and there are problems such as poor stability of voltage regulation and low accuracy of constant pressure.In this paper,the flow field simulation,static and dynamic simulation and test methods are used to study the anti proportional threaded cartridge relief valve,and the influence of structural parameters on the static and dynamic characteristics is analyzed.In order to improve the opening pressure ratio,reduce the dynamic response time and pressure overshoot rate,the valve was optimized.The main research contents include:(1)The static and dynamic mathematical model of inverse proportional relief cartridge valve is established.The dynamic characteristics of proportional electromagnet are tested and the correlation coefficient of dynamic equation is obtained,and the dynamic simulation model of electromagnet and valve is established in Simulink.(2)The forces on the valve core of the main valve and pilot valve are analyzed,and the steady-state and transient hydrodynamic calculation formulas are derived.The steady-state and transient simulation of the main valve and pilot valve are carried out by fluent fluid simulation software,and the correlation coefficient of the hydrodynamic calculation formula is obtained by analyzing the simulation results,which improves the static and dynamic model.(3)The static and dynamic simulation of the inverse proportional screw cartridge relief valve is carried out in MATLAB software respectively,and the influence of the structural parameters of the valve on the main static and dynamic characteristics is studied;The static opening pressure ratio,flow step characteristics and frequency response characteristics of the valve were simulated;The simulation results of static and dynamic parameters are analyzed by orthogonal decomposition method,and the optimized parameters are obtained.(4)The static and dynamic characteristics of the anti proportional threaded cartridge relief valve are tested according to the relevant test requirements of the national standard;the test and simulation results are compared and analyzed to verify the accuracy of the model and analyze the reasons for the difference.Finally,the main research of the thesis is summarized and the research direction of the follow-up work is prospected.