Research on hydraulic system with three-stage speed regulation of mine-used cable winding device

In view of the problem that cable winding speed cannot be synchronized with speed of continuous shearer, based on analysis of principle of hydraulic system with three-stage speed regulation of the cable winding device, simulation model of hydraulic system with three-stage speed regulation was established. The system uses combination design of throttle valve and pressure compensation valve to reduce design complexity and avoid energy loss when pressure compensation valve does not work. The three-stage speed regulation of 110, 80, 50 r/min of hydraulic motor is achieved, and so speed adjustment function of the cable winding device is realized, and synchronization of the cable winding speed and the continuous shearer traveling speed is ensured. The simulation and test results show that the throttle control is sensitive and the change of loop flow is stable; although there is slight fluctuation of pipeline flow at the opening and closing moments of the throttle valve, it does not affect the overall control effect; under the action of pressure compensation valve, the pipeline pressure of the system is basically stable at 14 MPa, which achieves good regulation and control effect of pressure; the test results of speed and torque trend of hydraulic motor are basically consistent with the simulation results, and the three-stage speed regulation effect is obvious.