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).
CRANE WITH HYDRAULIC BRAKING DEVICE FOR SWING DRIVE
KRAN MIT HYDRAULISCHER BREMSVORRICHTUNG FÜR DREHANTRIEB
GRUE AVEC DISPOSITIF DE FREIN HYDRAULIQUE POUR ENTRAINEMENT DE ROTATION
2021-08-18
Patent
Electronic Resource
English
IPC: | B66C Krane , CRANES |
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