PERFORATOR FOR DRILLING LARGE HOLES IN THE ROCK, ESPECIALLY INTENDED TO BE USED IN THE BOTTOM OF MINES

摘要

The invention relates to a drill for drilling large holes in the rock, especially in the bottom of mines, comprising a rotation drive means 4 movable longitudinally on uprights 2, 3 in the drill direction, which is equipped with a gear reducer and drive motors. The reduction gear according to the invention consists of a planetary transmission 15, 30 constituted by a superposition transmission 15, thanks to the functional and selective connection capability to two drive motors 67. / P P The well-equipped drill is suitable for pre-drilling, directional drilling, expansion drilling and large diameter drilling. / P