Simulation Study Of Pilot Solenoid Valve Used In Hydraulic Support

Coal mining has entered the era of fully mechanizing mining nowadays; Hydraulic Support (HS) is greatly used in fully mechanized coal mining equipment. But the core technologies of electro hydraulic control system in HS are mastered in several large foreigner companies. The electro hydraulic system of the HS is imported abroad. The imported system is expensive, which increase the whole cost of the HS deeply. As an key component in electro hydraulic control system, realize the Pilot Solenoid Valve (PSV) home made is the main task to reduce the cost and gain more market for domestic companies. This project is to analyze the design theory of the imported PSV.Traditional valve design uses centralized parameter calculation method, which simplifies flow field of the valve, so it can not acquire the accurate flow rate and pressure difference characteristic and the valve dynamic characteristic. Also the derived model can not describe the characteristic of the valve fully. In this thesis, finite element mathematic calculation method is used to analyze the characteristic of the valve instead, utilize the simulation results to modify the mathematic model, and then verify the mathematic model by experiment. The verified mathematic model is used to evaluate the geometry parameters variation influences to control characteristic of the valve. According to the thesis research points, the thesis is divided to five parts to introduce the relative contents.In the first chapter, the research state and application prospect of the HS are introduced, also the research contents and research meaning of the PSV are introduced.In the chapter two, the configuration of the pilot solenoid valve is introduced, the special characteristic of the valve is also analyzed.In the chapter three, the solenoid of the PSV is modeled and analyzed, the variation parameters simulation study is done to calculate the influences to the solenoid static and dynamic characteristics, also the remainder magnetic force is calculated, the principle of selecting the geometry parameters of the solenoid is gave out.In the chapter four, simulation study of the flow field in the PSV is introduced. The flow field distributions, energy loss, flow force, flow co-efficiency of the pilot valve and the main valve are calculated by CFD software. Also parameters variation simulation study is done to find out the parameter which the most deeply influences the characteristic of the PSV.In the chapter five, the whole PSV mathematic model is built, the simulation model is verified by the experiment. Then the verified model is used to do some parameters variation simulation study, which analyzes the valve characteristic and acquires the dynamic responses of the PSV in different geometry parameters.In the chapter six, some conclusions about this research work are introduced; also the future work is pointed out.