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Rock drill by a motor, gearbox and runways and other agencies, motor and gearbox into one called the host, through the sprocket, chain, work on the runway.

Department of motor three-phase AC squirrel-cage fan cooled induction motor.

There are three output shaft of gearbox, driven drill rotation, addition is a symmetrical two worm shafts, through l-worm gear system with single head and double-sided friction clutch engine on the track slow ahead through worm gear system and double l-double-sided friction clutch master quick return on a runway.