Abstract:Gas extraction from coal mine drilling, is in need of a kind of automatic and intelligent drilling rig instead of workers engaged in the kind of high strength, high risk work. By analyzing the common rotary drilling rig drilling operations, decomposing the motion of the robot according to the principle of action and structure of the manipulator, the hydraulic system of the manipulator is designed. Through calculation of the pressure and flow of the manipulator system, the pump and multi-way valve and other key hydraulic components were selected. From the scene debugging and industrial experiment, the effect of hydraulic system runs stably, the all actuators react rapidly with motion in coordination, which has reached the design requirements.