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摘要

PROBLEM TO BE SOLVED: To provide a rotary drive controller of which the rotary output can be automatically changed in accordance with rise and fall height.;SOLUTION: A rotary drive device 15 mounted to be vertically movable along the leader 5 of a pile driver 1 transmits the rotation of a hydraulic motor 10 to the output shaft 11 through a reducer to rotate a steel pipe pile, a screw rod 12, etc., connected to the output shaft 11. The rotary drive controller has a position detector 41 detecting the rising height of the leader 5 and a driving circuit of the hydraulic motor 10 changing at least one of torque, revolution number, or hose power of the output of the rotary drive device 15, receiving a signal from the positional detector 41.;COPYRIGHT: (C)2003,JPO