Hydraulic system for rotary/percussion rock drill has external pipe linking rotary drive return pipe to percussion feed line

摘要

A device for supplying hydraulic power to a rotary apparatus for percussive drilling ( 2 ) whereof the tool ( 3 ) is driven in one direction or another and subjected to the action of an impact device ( 6 ) acting independently of the rotation, of a hydraulic device ( 9 ) with forward movement enabling the tool to generate a pressure force on the ground, and optionally of a suction device ( 14 ) for the drilling dusts, driven by a hydraulic motor, the various hydraulic actuating elements being driven from a hydraulic liquid source under pressure through a hydraulic flow divider ( 16 ), a set of distributors ( 17, 18, 19, 20 ) and an assembly of branch pipes outside the apparatus, such as hose pipes. The device includes a branch pipe external to the apparatus ( 24 ) for communicating the return branch pipe ( 22 ) of the hydraulic device ( 4 ) driving the tool in rotation and the supply line ( 23 ) of the impact device ( 6 ), to add to the supply rate of the impact device the return flow rate of the rotation driving device.