Research On Advancing Velocity And Parameter Optimization Of Passage Device Of Hydraulic Support

Hydraulic support is the key equipment of synthetical mechanized mining, due to the differences of geological conditions and the unsuitable join parameters on passage device, hydraulic support easily is chewing bottom when advancing and scraper conveyor easily is floating bottom when pushing downspouting, thus researching how to avoid the chewing bottom and floating bottom has very vital significance;the advancing jack hydraulic circuit is one of the key circuits of hydraulic system, quick or slow of the advancing velocity directly affects efficiency of the entire synthetical mechanized mining, How to improve the advancing has also important significance.Firstly, contraposing the phenomenon of hydraulic support easily chewing bottom when advancing and scraper conveyor easily floating bottom when pushing downspouting, working condition of advancing is process stress analysis, the objective function and the force equilibrium equation is established, the join parameters of passage device using Matlab software is optimized, thus effectively avoid chewing bottom and floating bottom and improve the efficiency of pushing downspouting and advancing. Secondly, hydraulic system of hydraulic support and the pressure loss are analyzed in detail, and gain the calculation formula of advancing velocity, find the influence factors of advancing velocity and advancing velocity of affecting factors on the quantitative research. Analysis show that: when the load of advancing is less, relief valve is closed, advancing is constant flow state process, the method of improving the rated flow of pump can quickly improve advancing velocity and method of reducing resistance can not improve advancing velocity, advancing velocity depend on the rated flow of pump;when the load of advancing is more, relief valve opens and overflow, advancing is pressure flow dynamic process, the method of improving the rated flow of pump is not improving advancing velocity and method of reducing resistance can obviously improve advancing velocity, advancing velocity depend on rate of flow into the piston.Finally, simulation model of passes the hoisting jack control circuit is established by AMESim simulation software.According to the actual conditions of advancing, simulation parameters is seted and the dynamic characteristics simulation of passes the hoisting jack control circuit is proceeded and get the advancing velocity curve, the flow curve of the relief valve, the flow curve of inflow the piston, the flow curve of outflow the piston, the flow curve of hydraulic operated check valve and displacement curve of valve spool, etc. Simulation results show that: increasing liquid pipe diameter, although can obviously improve advancing velocity, but the stability of the system is reduced, increasing the diameter of hydraulic operated check valve spool, then can also improve advancing velocity, but not increase efficiency, and due to valve diameter increases, so the stability of the system are reduced, increasing the opening of hydraulic operated check valve can also improve advancing velocity, but the vibration of the valve spool is obviously aggravated, but the method of increasing spring stiffness of the valve can reduce the vibration of the valve spool. If the place of more pressure loss in the basic circuit increase bypass it can improve obviously advancing velocity, but due to increasing valves, so the cost is more. AMEsim simulation results verify theoretical analysis is coincident with the third chapter.The research work offer reference for how to avoid the chewing bottom and floating bottom and hydraulic operated check valve structure design of and how to improve advancing velocity.