HYDRAULIC CIRCUIT FOR AUGER LIFT DEVICE OF PILE DRIVER AND DRIVE PRESSURE ADJUSTING METHOD FOR AUGER LIFT DEVICE

摘要

PROBLEM TO BE SOLVED: To allow the lowering speed of an auger rotation drive device to follow the drilling speed of an auger screw when it is accelerated.;SOLUTION: The ascent side circuit 9a of a variable hydraulic motor 9 is provided with a pressure switch 16 and a lamp 17 reporting that the pressure of the ascent side circuit 9a detected by the pressure switch 16 approaches the release set pressures of cross relief valves 14, 15.;COPYRIGHT: (C)2001,JPO