Research On Hudraulic Support Automatiic System

The automation and unmanned operation of the fully mechanized mining face is of great significance for the safe and efficient production of coal mines.Electro-hydraulic controlled hydraulic support by is the key transition and supporting equipment for the fully mechanized coal mining face,whose automatic operation technology is the key to the automation of the fully mechanized mining face.Due to the height and the large size of the hydraulic support in the mining face with large cutting height,the existing hydraulic support automatic action process cannot be fully applied to the mining face with large cutting height.Based on the background of the 416 automation mining face with large cutting height of Huangling No.2 Mine,the key technologies of the automatic operation of the hydraulic support of the mining face with large cutting height were studied.From the point of view of action control,the automatic operation level of the hydraulic support of the mining face with large mining height is improved,and then the safe and efficient automatic support of the hydraulic support is realized.Based on the status of the mining face with large cutting height,the automation system and the automatic operation strategy of hydraulic support were studied.Aiming at the problems such as the slow movement speed,the collapse of the coal wall and the insufficient elevation of the basement during the automatic operation of the hydraulic support in engineering practice,the hydraulic support automatic action plan of "maintaining the stability of the supply pressure and guaranteeing sufficient action flow rate" was proposed.AMESim fluid simulation software was used to simulate the hydraulic support electro-hydraulic control system.Based on action logic control,a variety of action models are given.The displacement,flow and pressure characteristics of the hydraulic support under different action models are shown.On this basis,the logic control scheme of automatic operation of hydraulic support was studied compared with different motion control methods.In the paper AMESim software is used to analyze the effect of flow,pressure and back pressure of the liquid supply system on the movement of the hydraulic support.Subsequently,according to modeling and simulation of the emulsion pumping station system and the liquid supply pipeline,the load pressure characteristic curve of the pumping station and the flow resistance curve of the annular liquid supply piping are analyzed.These studies provide arguments that how the fluid supply system stabilizes the pressure supply.Based on the study of the automatic action characteristics of the hydraulic support and the hydraulic characteristics of the liquid supply system,an automatic action process of the hydraulic support group with the "hydraulic support action organic combination " was proposed.The AMESim simulation model for the hydraulic support group was established,and a stable and optimized system pressure curve was obtained after the simulation.The optimization plan for automatic operation of hydraulic supports in the mining face with large cutting height was proposed and tested at 416 mining face of Huangling No.2 Mine.The test results show that the hydraulic support moves smoothly under this program,and the problem of coal wall collapsing and under-lifting of the base is obviously improved.The pressure of the liquid supply system during the test was relatively stable,which increased the overall automatic follower level of the hydraulic support in the mining face with large cutting height.