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ROPE LOOSENESS CONTROL METHOD FOR PREVENTING OVERSPEED AT LOWERING IN A CONTROLLER FOR PILING WORK AND DEVICE THEREFOR
ROPE LOOSENESS CONTROL METHOD FOR PREVENTING OVERSPEED AT LOWERING IN A CONTROLLER FOR PILING WORK AND DEVICE THEREFOR
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机译：用于防止打桩工作的控制器中的落差过大的绳索松散控制方法及其装置
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摘要
PROBLEM TO BE SOLVED: To prevent a rope from being loosened automatically at the time of lowering a pile in piling work. SOLUTION: This consists of an induction motor 105 which winds and lowers a rope for hanging a pile, an operating lever 11a, a controller 11 which sets a rotational speed command NREF1 according to the operation of the operating lever 11a, a rotational speed command circuit 12 which determines the rotational speed command at the time of lowering the induction motor 105 as necessary, according to a load torque TFB in lifting the pile and outputs the rotational speed command NREF2 to restrict the rotational speed command NREF1 and an inverter 6 which controls the rotational speed of the induction motor 105 based on the rotational speed command NREF2 .
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