Large Bore Hydraulic Support System Simulation Studies

Hydraulic support is an important part of the compound mining equipment,and its hydraulic control system is the high pressure system. With thedevelopment of the hydraulic support technology, the work resistance and itssupporting height continues to improve, the support of the hydraulic systemreliability and safety protection function requirement is more high. Soimproving the speed of the hydraulic system and reducing the pressure impactin the working process of the hydraulic system as the problems that stentsproducers and users need to solve.In the paper, based on the prototypical ZY12000/28/64's research, thehydraulic control systems of the hydraulic support were studied. First the papermakes a brief introduction of the dynamic characteristics of hydraulic systemand analyzes the work principles of the hydraulic system pillar stents,can getthe factors that affecting the hydraulic support's move and the reasons thatproduce the hydraulic shock. Detailed introduced with gray-box modelingmethod to establish the mathematical model of the hydraulic components in thelarge-scale system of hydraulic pressure and hydraulic system with the entireprocess, get the various stages of the differential stage. By usingMATLAB/SIMULINK software, it set up the five-stage column simulationmodels-raising leg stage, constant resistance stage, unloading stage, pullingconveyer stage and moving support stage. According to the mathematical model,it also sets system parameters and simulation parameters, operation simulationsand gets the cavity pressure curve, the displacement curve, and velocity curve ofsupport plunger cavity in the stage of raising leg with the slope response; theconstant resistance under the step response, safety valve when unloading,hydraulic control check valve pressure, flow, spool displacement curve; and thedisplacement curve in the stages of pulling conveyer and moving support. Whenchanging the spring stiffness of safety valve, the diameter of the hydrauliccontrol mouth, controlled-side piston area, spool overflow shock and stressimpact can be reduced with an appropriate increase in safety valve spool spring stiffness and damping; the spool vibration and unloading stress impact can bereduced while reducing hydraulic control check valve diameter and increasingthe control-side piston area; and increase the rated flow of emulsion pumpstation can shorten the time of the pulling conveyer and moving support thatrequired to process, and improve the move speed frame.The research provides a reference basis for the move frame rate of thehydraulic system and optimization of system parameters.