The crane includes a swing brake device (20) installed between a hydraulic motor (2) and a control valve (6) and having a flow restrictor; a first backpressure detector detecting a motor backpressure between the flow restrictor and one of ports of the hydraulic motor (2); a second backpressure detector detecting a motor backpressure between the flow restrictor and the other port of the hydraulic motor (2); and a control device (13). The control device (13) has an external-force direction estimation unit (13b) that estimates a swing direction of an upperstructure (103) under an external force acting on the upperstructure (103) on the basis of a motor backpressure detected by the first backpuressure detector and a motor backpressure detected by the second backpressure during an operating state of the swing brake device (20). The control device (13) has a notification control unit (13h) that causes the notification device (19) to provide notification of the estimated swing direction of the upperstructure (103).


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    Title :

    CRANE WITH HYDRAULIC BRAKING DEVICE FOR SWING DRIVE


    Additional title:

    KRAN MIT HYDRAULISCHER BREMSVORRICHTUNG FÜR DREHANTRIEB
    GRUE AVEC DISPOSITIF DE FREIN HYDRAULIQUE POUR ENTRAINEMENT DE ROTATION


    Contributors:

    Publication date :

    2021-08-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B66C Krane , CRANES



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