BUCKET DRIVE DEVICE FOR EARTH DRILL MACHINE

摘要

PROBLEM TO BE SOLVED: To facilitate the disconnecting/connecting work of a hydraulic hose without generating an internal pressure in hydraulic thruster cylinders by fixing a Kelly drive when mounting a bucket drive device on a frame. SOLUTION: A fixing metal fixture 15 regulating the movement of the Kelly drive 9 is provided between a Kelly frame 7 and the Kelly drive 9 of the bucket drive device 5 to prevent the internal pressure from being generated in the hydraulic thruster cylinders 8 and 8.