PROBLEM TO BE SOLVED: To provide an overload prevention device and an overload prevention method for a manual hoisting machine with an electric auxiliary motor capable of accurately detecting the weight of a load to be raised/lowered with a simple configuration and surely preventing hoisting of a load having weight exceeding a rated value of a product.SOLUTION: An overload prevention device for a manual hoisting machine with an electric auxiliary motor (9) includes: a torque sensor (7) for detecting a rotational force and a rotating direction, which are applied to a manual wheel (3) by a hand operation of a manual rope (C2); and a motor current sensor (Is) for detecting driving current supplied to the electric auxiliary motor (9). Control means (200) calculates the weight of a load (L) from the rotational force (T) of the manual wheel (3) detected by the torque sensor (7) and the driving current (I) detected by the current sensor (Is) when the rotating direction of the manual wheel (3) is a hoisting direction, and stops the electric auxiliary motor (9) and stops rotation support of a drive wheel (2) when a weight value exceeds a weight value of a rated value of a product.SELECTED DRAWING: Figure 1

    【課題】簡単な構成で昇降させる荷の重量を精度よく検出でき、製品定格を越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負荷防止装置及び過負荷防止方法を提供すること。【解決手段】電動補助モータ付き手動巻上機の過負荷防止装置であって、手動索(C2)の手引きによって手動輪(3)に加わる回転力と回転方向を検出するトルクセンサ(7)と、電動補助モータ(9)に供給される駆動電流を検出するモータ電流センサ(Is)とを備え、制御手段(200)は手動輪の回転方向が巻上げ方向の場合に、トルクセンサで検出された手動輪の回転力(T7)と、電流センサで検出された駆動電流(I9)とから荷(L)の重量を算出し、該重量値が製品定格の重量値を越えた場合に電動補助モータを停止し、駆動輪(2)の回転支援を停止する。【選択図】図1


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    Title :

    OVERLOAD PREVENTION DEVICE AND OVERLOAD PREVENTION METHOD FOR MANUAL HOISTING MACHINE WITH ELECTRIC AUXILIARY MOTOR


    Additional title:

    電動補助モータ付き手動巻上機の過負荷防止装置、及び過負荷防止方法


    Contributors:

    Publication date :

    2016-02-01


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66D Haspeln , CAPSTANS



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