Design And Research Valves And High Frequency High Flow Proportional Servo

With the improvement of large mechanical and electrical equipmentautomation degree, engineering field of hydraulic control system for higherperformance index is proposed. Electro-hydraulic proportional servo controltechnology synthesize the electro-hydraulic proportional control technology andthe electro-hydraulic servo control of their respective advantages, become one ofthe highlights of the current hydraulic control technology. In this paper on thebasis of the comparative analysis on the current all kinds of high frequency, highflow electro-hydraulic proportional servo valve structure, put forward thatthrough the power level of proportional servo valve design and optimization ofthe main valve structure, selected the high response forerunner level controlvalve, combined with theoretical analysis and the flow field simulation andstatic dynamic characteristics simulation analysis method, devised the highfrequency large flow proportional servo valve, widened the research designideas and methods of the high frequency large flow proportional servo valve, itis of great significance.First of all, from the angle of control mode, this paper introduced thedevelopment process of hydraulic valve, summarized the research status anddevelopment trend of the big flow high frequency proportional at home andabroad, the main research content of this paper is presented. Then according tothe requirement of the design parameters, determined the design scheme of highfrequency large flow proportional servo valve, the principle and structure hasbeen carried on the detailed elaboration, and the power level of the main valvehas been carried on the preliminary structure design and theoretical calculation.Second, on the basis of the preliminary structure design, the flow fieldsimulation model of the master level valve was established, the flowcharacteristic of the main valve and the function on the slide valve core ofsteady fluid power were simulated by using FLUENT simulation software whenopening the different valve openings of the main valve, the fitted curve functionof the valve port opening of the steady fluid power under the condition of large flow was got, provided theoretical analysis basis with the next dynamic responsesimulation. Then set up the mathematical model of grade pilot valve and mainvalve, Simulink simulation model is established in the simulation software. Bycomparing the control scheme and changing the simulation parameters, foundout the key parameters and the change trend of influencing the dynamiccharacteristics of the proportional servo valve, provided the necessarytheoretical support for the further analysis of the optimization design.In the end, simulation results combined with the key factors influencing thedynamic frequency response of the proportional servo valve were used tooptimize the main valve structure and parameters of the main valve, at the sametime from the point of view of process analysis to optimize the frequencyresponse characteristics of the power level main valve, determined the structuralparameters of the main valve. Finally the simulation results show that thereasonable structure design can meet the requirements of high frequency largeflow of the power level main valve, demonstrated the feasibility of the scheme.Then a comprehensive summary was made in this project, put forward thedeficiency, and predicted the future research work.