Drilling device for piercing holes in metallurgical converters - allowing introduction of tuyeres for the blowing of lime, oxygen and other gas into molten metal for refining treatments

摘要

A drilling device comprises a mobile frame fitted with a means for centring and interlocking the drill to the bottom of a converter. A support slides inside the frame the length of the two columns under the action of a jack. The sliding support carries a drill holding pin driven in rotation by a motor and conventional redn. gear. The mobile frame is mounted to slide vertically on a mobile carriage fitted with a two speed double-acting hydro-pneumatic jack. The carriage can be displaced by means of an arm pivoting on a fixed axis. A system of air-cooling the drill is also provided.