Hydraulic motors for actuating and controlling an anti-swing...

Details Hydraulic motors for actuating and controlling an anti-swing... Hydraulic motors for actuating and controlling an anti-swing...

B - Operations, Transporting

66

C

B66C 13/06 (2006.01)

Patent

CA 2608022

The invention relates to hydraulic motors for actuating and controlling an anti-swing system in container-handling cranes. Container-handling cranes pose the following problem, namely that, when the trolley moves, the cables supporting the load spreader oscillate longitudinally in relation to the aforementioned movement.Systems currently used to reduce said swinging movement are inconvenient because (i) they comprise numerous power transmission elements, thereby generating maintenance problems, and (ii) the main two functions thereof are performed separately, i.e. movement transmission and oscillation reduction. The aforementioned problems can be resolved with an autonomous, independent drive system using hydraulic motors, thereby rendering the power transmission drive chain simple, robust, reliable and easy to maintain. In addition, the motors perform the main functions simultaneously, i.e. producing the movement and reducing the oscillations. According to the invention, pressure-limiting devices are used to dampen the pressure points applied to the motors during the swinging movement. The system balances the pressure on the motors and, in this way, offsets the oscillating movement.

Dans le domaine des portiques à conteneurs, le problème suivant se pose : lorsque le chariot se déplace, les câbles auxquels est suspendu le cadre de préhension mécanique se balancent dans le sens du déplacement. Les systèmes utilisés pour réduire ce balancement présentent deux inconvénients : d'une part, le nombre élevé d'éléments pour la transmission de la puissance, ce qui signifie des problèmes d'entretien ; et, d'autre part, la séparation des fonctions principales, à savoir la transmission du mouvement et la réduction du balancement. La présente invention concerne des moteurs de commande hydrauliques, autonomes et indépendants, permettant d'obtenir une chaîne cinématique de transmission de puissance plus simple, plus robuste, plus fiable et plus facile d'entretien, offrant une solution auxdits problèmes. De plus, ces moteurs effectuent les deux fonctions principales : production de mouvement et réduction du balancement. Moyennant des dispositifs de limitation de la pression, les pointes de pression qui supportent les moteurs durant le balancement sont amorties. Le système équilibre la pression des moteurs et neutralise ainsi le mouvement de balancement.

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