METHOD AND DEVICE OF CONTROLLING A ROCK DRILLING MACHINE

摘要

Method and device for controlling a rock drilling machine (51) comprising an impact device (5) for exerting a drilling tool (52) to impacts, a rotation motor (7) for rotating the drilling tool (52) and a feed motor (6) for feeding the drilling tool (52) against a ground (53). The pressure to an inlet (30) of the rotation motor (7) is sensed. When this pressure exceeds a first predetermined value (41) the pressure to an inlet (32) of the feed motor (6) is reduced with the aim of keeping the pressure to the rotation motor substantially constant. When the pressure to the inlet (30) exceeds a second predetermined value (42) the pressure to an inlet (31) of the impact device (5) is controlled inversely proportionally to the pressure to the inlet (30) of rotation motor (7).