To suppress continuance of power supply to a brake coil even at the point of time when an operator completes the operating of hoisting/lowering a suspended load in a crane braking for which is released by means of the power supply to the brake coil.SOLUTION: A crane malfunction prevention system comprises: an input first unit 11 to which a signal indicating the on-going motion of a crane hoist can be input; an input second unit 12 to which a signal indicating on-going power supply to a brake coil 81 can be input; and an output first unit 15 that can forcibly turn off a brake coil power supply power source 31. When it can be determined that the crane hoist is not working but a situation where power is being supplied to the brake coil has continued for a prescribed period from the input state of signals to the input first unit and the input second unit, the output first unit forcibly turns off the brake coil power supply power source.SELECTED DRAWING: Figure 1

    【課題】ブレーキコイルに通電することでブレーキが解除されるクレーンについて、作業者が吊り荷の巻上げ/巻下げを吊り上げの操作を終了した時点においても、ブレーキコイルへの通電が継続されてしまうのを抑制すること。【解決手段】クレーンの巻き上げ機が動いていることを表す信号を入力可能な入力1部11と、ブレーキコイル81に通電していることを表す信号を入力可能な入力2部12と、ブレーキコイル通電電源31を強制的にオフにすることが可能な出力1部15と、を備え、入力1部と入力2部への信号の入力状況から、クレーンの巻き上げ機が動いていないが、ブレーキコイルに通電しているという状況が所定時間継続したと判定できた場合、出力1部がブレーキコイル通電電源を強制的にオフにする構成とする。【選択図】図1


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    Title :

    CRANE MALFUNCTION PREVENTION SYSTEM


    Additional title:

    クレーン誤動作防止システム


    Contributors:

    Publication date :

    2021-12-27


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES / B66D Haspeln , CAPSTANS



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