Method and apparatus for controlling rock drilling

摘要

Method and apparatus for controlling rock drilling with a percussion device belonging to a rock drill to deliver stress waves to rock through a tool by pushing the tool against the rock by means of a feed motor and rotating simultaneously the tool by means of a rotation motor, whereby the maximum feed force is determined, pressure medium is supplied to the feed motor and to the rotation motor and the feed force is controlled according to the drilling conditions. The feed force is controlled on the basis of the feed speed and the rotation torque. The apparatus has a load control valve which controls the feed.

主权项

1. A method for controlling rock drilling wherein a pressure liquid operated percussion device belonging to a rock drill machine delivers stress waves to rock through a tool, wherein the rock drill machine and the tool are simultaneously pushed against the rock by means of a feed motor, and the tool is simultaneously rotated by means of a rotation motor, the method comprising:
determining a maximum feed force; supplying pressure liquid to the feed motor along a feed pressure channel and away from the feed motor along a feed return channel; supplying pressure liquid to the percussion device along a percussion pressure channel and away from the percussion device along a percussion return channel; supplying pressure liquid to the rotation motor along a rotation motor pressure channel and away from the rotation motor along a rotation motor return channel; controlling the feed force in relation to a feed speed so that when the feed speed is increased the feed force is decreased and vice versa; controlling the feed force in relation to a rotation torque so that when the rotation torque is increased the feed force is decreased and vice versa; measuring the feed speed; measuring a rotation pressure; controlling the feed force in relation to the measured feed speed and the measured rotation pressure; and controlling a percussion power in relation to the feed force so that when the feed force is decreased below a predetermined value the percussion power is decreased and when the feed force again increases the percussion power is correspondingly increased.