Analysis And Research For Performance Of New Type Mass Flow Relief Valve FAD250/50 For Powered Support

Since the new 312-2000 Compulsory General Conditions of Hydraulic Supports was carried out in 2001, the strength, endurance and stability of the hydraulic support, as a fundamental part of the four pieces of integrated coal mining equipment (including coal grab, driving machine, scraper and hydraulic support) has been highly required.FAD250/50 is a new relief valve with big flux developed by Hydraulic Center, ZMG Group. It has been adopted by some main domestic factories that produce hydraulic supports recently. However, the research on the dynamic and static properties of this relief valve is rare to be seen in China. The mathematic model of hydraulic support system is built by Power Bond Graph Method, and the simulation model of hydraulic system is built in Matlab. With the help of the Hydraulic Center, ZMG Group, experimental results are obtained from the designed test bench and compared with the simulation results to correct the system model. Then, by simulating the correct model the trends and laws about the structural parameters influnce on the characteristics of the Relief can be concluded.The present study not only offers the precious theoretical grounds and research plan for the further development of a new relief valve with bigger flux, but also serves as a reference in developing the other types of valves in hydraulic support system. Meanwhile, this study is of great significance in filling the technologic gap of hydraulic support between our country and the world, pushing the innovation development of technology in China forward, and realizing the leapfrog development of the society.