Rotary percussive rock drill - has piston on drilling spindle hydraulically controlled by gas spring member one side

摘要

The rock drilling machine with a guide frame carried on a tracked vehicle, has the drilling head mounted on a carriage so that it can be advanced during the drilling operation. The frame can be tilted to any required angle. The drilling head is hydraulically driven, and is operated both as a rotary and impact device. The drive shaft (11) is rotated by toothed gearing (12, 30) powered by a hydraulic motor (27) alongside, and the impact mechanism is at the rear. This mechanism also includes a cylinder (16) mounted around the shaft (11) in a chamber filled with hydraulic fluid. At the side of this chamber is a resilient element (22) controlling a hydraulic supply channel (19) for both flow directions. This element is a gas chamber which can be incorporated inside the cylinder chamber.