Patent ID: 8579045
Filing Date: 2013-11-12
Classification: E21B

Abstract:
1. Rock drilling device comprising a feed beam ( 4 ), which has a drill end ( 41 ) from which a drill point protrudes at drilling and a rear end ( 42 ) opposite said drill end; a rock drilling machine ( 5 ) movable along the feed beam ( 4 ); said rock drilling machine having a drill string comprising a plurality of drill rods; a pressure cylinder ( 6 ), which is arranged in connection with the feed beam ( 4 ) with one end ( 622 ) movable relative to the feed beam ( 4 ) and one end ( 611 ) fixedly arranged relative to the feed beam ( 4 ); a feed line ( 51 ), which is driven by the pressure cylinder ( 6 ) and connected to the drilling machine ( 5 ) for feeding the drilling machine to and fro along the feed beam ( 4 ), characterized in that the feed line ( 51 ) is routed over two outer sheaves ( 52 , 53 ) that are arranged at each end ( 41 , 42 ) of the feed beam ( 4 ) and in that a measuring device ( 7 ) that measures a location of the drilling machine ( 5 ) relative to the feed beam ( 4 ) for measuring the depth of penetration of said drill point during drilling operations and which measures a location of the drilling machine ( 5 ) relative to the feed beam ( 4 ) during adjustment of a size of the drill string is arranged to the shaft ( 9 ) of one of the outer sheaves ( 52 , 53 ) and that this sheave ( 52 , 53 ) and the shaft ( 9 ) are arranged such that they rotate together, said drilling machine being coupled to a proximal end of said drill string so that said measuring device directly measures the location of said proximal end of said drill string relative to said feed beam.