Simulation and Experimental Study of a Novel Load-Sensitive Control Valve for Mining Drills

In order to improve the adaptive capacity of hydraulic drill rigs under complex geological conditions, a novel load-sensitive control valve based on a reducing valve with load-sensitive control module is proposed. It solves the problems existing in the propulsion of mining drills and realizes the thrust adaptive function. The fluid simulation model of the load-sensitive control valve is established. The variation of the pressure at the outlet of the reducing valve under different starting pressures and feedback spring stiffness is studied. The simulation data are compared with the experimental data. It demonstrates that the load-sensitive control valve can effectively adjust the driving force of the oil cylinder and reduce the bit wear when the load pressure is raised suddenly.