Method of controlling bucket angle of hydraulic shovel

E - Fixed Constructions – 02 – F

Patent

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E02F 3/43 (2006.01) E02F 9/20 (2006.01)

Patent

CA 2181834

A bucket-angle controlling method which is capable of automatically turning off the bucket-angle-maintaining control to maintain the bucket of a hydraulic shovel (12) at a specified position. When the open surface of the bucket (15bk) comes close to the horizontal plane bucket angle (.theta. bk), which is an angle of the bucket (15bk) open surface with respect to the horizontal plane, is maintained constant in order to prevent load from being spilled at the time of unloading and so forth. When bucket angle (.theta. bk) is greater than a preset standard value (.theta. bkset), a controller judges that bucket (15bk) is performing excavation. Then, the bucket-angle-maintaining control is temporarily deactivated to permit excavation to be performed through manual control.

L'invention concerne un procédé permettant l'arrêt automatique de la commande de maintien de l'angle d'inclinaison du godet, cela pour maintenir le godet d'une pelle hydraulique (12) dans une position déterminée. Lorsque la surface ouverte du godet (15bk) se rapproche du plan horizontal, l'angle d'inclinaison du godet (.theta.bk), c'est-à-dire l'angle que forme la surface ouverte du godet (15bk) avec le plan horizontal, est maintenu à une valeur constante pour empêcher que la charge ne soit répandue au moment du déchargement, etc. Lorsque l'angle d'inclinaison du godet (.theta.bk) dépasse une valeur normalisée préréglée (.theta.bkset), un contrôleur détermine que le godet (15bk) est en train de creuser. Ensuite, la commande de maintien de l'angle d'inclinaison du godet est temporairement désactivée pour permettre la réalisation de l'excavation par commande manuelle.

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