Research On Key Technologies Of Large Power Hydraulic Impact System

With the continuous improvement of the impact resistance requirements, impact test device develops toward the high-speed and heavy-load directions. However, the traditional method of pendulum gravity can’t meet people’s needs due to its limited energy storage as well as its large size and other defects. Hydraulic drive with a high power density, energy storage convenience and high security, etc., becomes the first choice of high-speed and heavy-load impact test device.In this paper, key technologies of the large-power hydraulic impact system are researched, including the overall program of the large-power hydraulic impact system, the large flow control device, the gas-liquid mixing hydraulic cylinder and instantaneous high-power source.In this paper, the large flow control device composed of piston type pilot valve opening quickly and cylinder type main valve which has the large flow capacity is designed to meet the need of large flow control, the structure design and principle analysis of the large flow control device are done. The opening characteristics of pilot valve, the displacement characteristics and flow characteristics of main valve are simulation analyzed by AMEsim software to verify the reasonableness of the design. The gas-liquid mixing hydraulic cylinder is used as the actuator of system, and the special structure of piston is designed to solve the trapping phenomena and air accumulating phenomena generated by high speed movement. At the same time, sliding ring combined seal form and primary and secondary seal arrangement are utilized to solve the dynamic seal of hydraulic cylinder. The forces of gas-liquid mixing cylinder during movement are analyzed, and strength check of tube and piston rod are done according to the analysis result. To meet the large power, high flow, instantaneity and fast requirements of power source, the instantaneous power source supplied by large flow accumulators is designed. Last, the overall system simulation analysis is done by AMEsim and the results show that the large power hydraulic impact system designed in this paper can meet the requirement of achieving desired impact energy in the given itinerary.