Patent ID: 7654337
Filing Date: 2010-02-02
Classification: E21B,F15B

Abstract:
1. A method for controlling rock drilling wherein a percussion device belonging to a rock drill machine delivers impact pulses to rock through a tool and wherein the rock drill machine is simultaneously pushed against the rock by means of a feed actuator the method, comprising: feeding a pressure medium to the feed actuator along at least one feed channel; feeding the pressure medium to the percussion device along at least one percussion pressure channel; determining a penetration rate; adjusting at least a percussion pressure on the basis of the penetration rate, conveying at least one pressure medium flow supplied to or from the feed actuator through at least one restrictor, sensing the pressure of the pressure medium before the restrictor and after the restrictor in order to determine the penetration rate, and adjusting the percussion pressure on the basis of the determined penetration rate.