PROBLEM TO BE SOLVED: To provide an overload hoisting prevention device of a manual hoist with an electric auxiliary motor which can accurately detect a weight of a load to be raised and lowered with a simple configuration and reliably prevent hoisting of a load with a weight exceeding a product rating, and provide an overload hoisting prevention method.SOLUTION: An overload hoisting prevention device of a manual hoist with an electric auxiliary motor calculates an assisting force of an electric auxiliary motor 9 when a weight value of a load is equal to a predetermined value which is equal to or less than a rated load value, supplies a current corresponding to the calculated assisting force from a motor driver 8 to the electric auxiliary motor 9 by control of control means 200, operates the electric auxiliary motor 9 by torque control, and assists rotation of a driving wheel 2. When the weight value of the load detected by weight detection means exceeds the rated load value, the overload hoisting prevention device operates the electric auxiliary motor 9 by zero speed control of setting the speed of the electric auxiliary motor 9 to zero. The weight value of the load is detected from a detected rotational force from a rotational force sensor 7 and a detected current value of a current sensor 18.SELECTED DRAWING: Figure 1
【課題】昇降させる荷の重量を簡単な構成で精度よく検出でき、製品定格を超える重量の荷の巻上げを確実に防止できる電動補助モータ付き手動巻上機の過荷重巻上防止装置、及び過荷重巻上防止方法を提供すること。【解決手段】荷の重量値が定格荷重値以下の所定値の場合、電動補助モータ9の支援力を算出し、制御手段200の制御によりモータドライバ8から電動補助モータ9に算出した支援力に対応する電流を供給し、トルク制御により電動補助モータ9を運転し、駆動輪2の回転を支援する電動補助モータ付き手動巻上機の過荷重巻上防止装置であって、重量検出手段で検出した荷の重量値が定格荷重値を超える場合、電動補助モータ9の速度をゼロにするゼロ速度制御により電動補助モータ9を運転する。荷の重量値は、回転力センサ7からの検出回転力と電流センサ18の検出電流値から検出する。【選択図】図1
OVERLOAD HOISTING PREVENTION DEVICE OF MANUAL HOIST WITH ELECTRIC AUXILIARY MOTOR, AND OVERLOAD HOISTING PREVENTION METHOD
電動補助モータ付き手動巻上機の過荷重巻上防止装置、及び過荷重巻上防止方法
2017-09-14
Patent
Elektronische Ressource
Japanisch
IPC: | B66D Haspeln , CAPSTANS |
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