Design And Key Technology Research Of Multi-way Hydraulic Valve Testing System

The hydraulic testing technology has made great progress with the development of the CAT, the combination of the hydraulic testing and virtual instrument also improve the degree of hydraulic testing technology intelligence to a great extent. The development of the hydraulic technology is closely related to hydraulic testing technology. However, there still existed many key technical issues in the research of hydraulic testing technology although we have developed many hydraulic testing systems in the process of hydraulic technology research in recent years. In this paper, a comprehensive testing system of muti-way valve was developed according to the industry standards to improve the whole perforemence of the valve. In the process of the development, several technical problems of the hydraulic testing system were encounted and the results of the research would apply to other hydraulic testing systems. Each chapter of this paper is outlined as follows:In chapter1, the present study and further development of hydraulic testing technology is introduced, the current situation of research on valves testing system is analyzed. Finally, the significance and main research subjects are presented.In chapter2, the design tasks and whole scheme of the comprehensive testing system are introduced. Three aspects are analyzed in detail about the designing of the system, including the layout of the testing system, safty guarding and combined loading.The feasibility of this system is tested through experiments with a muti-way valve.In chapter3, the pressure rising rate of hydraulic testing system transient test is researched. The fast switching unit with two-way cartridge valve is choosen to applied load for the muti-way valve after analysing several step loading methods. The simulation models of different loding schemes are built in Amesim, different loding schemes are compared and various aspects influencing the pressure rising rate are analyzed in this model. Ultimately, the test results show that the pressure rising rate of this hydraulic testing system meets the requirement at the guidance of the simulation results. In chapter4, the research of hydraulic testing system accuracy is carried out because this testing system should meet the B level according to the industry standard. The sources of affecting the error of the accuracy in this system are analyzed completely. Several appropriate measures are taken and some apparatus are employed to ensure the accuracy of this sytem.In chapter5, the oil tempreture controlling subsystem of this testing system is designed after analyzing the tempreture control requirements and comparing several oil tempreture controlling methods. A new tank structure with labyrinth separator is introduced to improve the phenomenon of poor temperture distribution in the tank and simulation results illusrate the effectiveness of the proposed approach. A temperature control strategy is given out and the effect of the temperature control system meets the requirements.In chapter6, some conclusions in this thesis are given and some future research proposals are suggested.