Patent ID: 8418618
Filing Date: 2013-04-16
Classification: E21B,E21C

Abstract:
1. A rock drilling unit for small-charge blasting, the drilling unit comprising: a feed beam; a rock drill machine; a feed device which enables the rock drill machine to be moved on the feed beam in a feed direction and in a return direction; a drilling tool connected with the rock drill machine; a front guide which is located in a front part of the feed beam and through which the drilling tool is arranged; and a propellant feed channel which enables a propellant comprising a propellant charge to be fed into a hole, wherein the propellant feed channel is a separate member with respect to the drilling tool, wherein the propellant feed channel is arranged in the front part of the feed beam, wherein the propellant feed channel is a flexible tube, and wherein the drilling unit comprises at least one transfer device which enables the propellant feed channel to be pushed into the hole for feeding the propellant and further, the transfer device enabling the propellant feed channel to be pulled back out of the hole after the propellant has been fed.