PROBLEM TO BE SOLVED: To provide an overload preventing device for a mobile type crane that can prevent data on the overload preventing device in an external storage device from being lost.SOLUTION: An overload preventing device 2, configured to acquire a load to be applied to a crane and prevent the acquired load from surpassing a predetermined value corresponding to a posture of the crane, comprises a CPU 22 that reads out posture data from an external storage device 21, acquires a load corresponding to the posture of the crane and detects that the acquired load surpasses the predetermined value. The CPU 22 is provided with: a mirror copy portion 220 that copies separately a plurality of pieces of posture data stored in the external storage device 21 to the external storage device 21 so as to create a plurality of pieces of mirror posture data; a mirror data acquiring portion 221 that when an error occurs in the posture data acquired from the external storage device 21, acquires mirror posture data corresponding to the acquired posture data; and an overwriting portion 222 which overwrites the acquired mirror posture data as posture data of the external storage device 21.

    【課題】外部記憶装置における過負荷防止装置データの消失を抑制することができる移動式クレーンの過負荷防止装置を提供すること。【解決手段】クレーンに加わる負荷を取得し、取得した負荷がクレーンの姿勢に応じた所定値を超えることを防止する過負荷防止装置2において、外部記憶装置21から姿勢データを読み出して、クレーンの姿勢に応じた負荷を取得し、取得した負荷が上述の所定値を超えたことを検出するCPU22を備える。このCPU22に、外部記憶装置21に記憶された複数の姿勢データを、外部記憶装置21に別途コピーして複数のミラー姿勢データを作るミラーコピー部220と、外部記憶装置21から取得した姿勢データにエラーが生じているとき、当該取得した姿勢データに対応するミラー姿勢データを取得するミラーデータ取得部221と、取得したミラー姿勢データを、外部記憶装置21の姿勢データとして上書きする上書部222と、を備える。【選択図】図2


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    Title :

    OVERLOAD PREVENTING DEVICE FOR MOBILE TYPE CRANE


    Additional title:

    移動式クレーンの過負荷防止装置


    Contributors:

    Publication date :

    2015-10-29


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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