Apparatus and process for tapping molten metal furnaces using a rotary percussion mill

摘要

An apparatus and process for tapping molten metal furnaces using a rotary percussion drill include a drilling rod assembly having a replaceable drilling section initially to drill the plugged tap hole to the furnace skull before being removed from the drill and being replaced by a one piece poking rod assembly to break the skull to tap the furnace. A cage assembly is pivotally mounted to the drive box of the drill to assist in alternately mounting the drilling rod assembly or poking rod assembly to the drive box and in cooperating with the drive box to provide the drive connection to the drill.