A method for controlling the motion velocity of a...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 11/04 (2006.01) F15B 11/042 (2006.01)

Patent

CA 2319183

The present invention concerns a method for controlling the speed of motion of a hydraulically operated machine, an operating system and a control device of the machine. The flow line (3) of the medium from the pump (2) to the machine (1) is divided into two branches (10, 11). By means of a valve (8), the second branch (11) can be set to feed medium either to the machine (1) or to return the medium to the tank (4) of the pump. Such a flow is led to the second valve (8), that at a speed of rotation of the pump lower than the highest speed of rotation, the difference between the flow supplied by the pump and the flow through the second branch produces the desired slowest speed on motion of the device. When the valve (8) is set to return the medium to the tank (4) of the pump, the flow from the pump (2) is adjusted by changing the speed of rotation of the pump.

La présente invention concerne un procédé de commande de la vitesse de déplacement d'une machine hydraulique, un système de fonctionnement et un dispositif de commande pour cette machine. La ligne d'écoulement (3) du milieu entre la pompe (2) et la machine (1) est divisée en deux branchements (10, 11). Une soupape (8) permet au deuxième branchement (11) d'être réglé pour fournir le milieu à la machine (1) ou pour le renvoyer à la cuve (4) de la pompe. Cet écoulement est envoyé vers la deuxième soupape (8), à une vitesse de rotation de la pompe inférieure à la vitesse de rotation maximale, la différence entre l'écoulement fourni par la pompe et l'écoulement dans le deuxième branchement produisant la plus faible vitesse de déplacement du dispositif. Lorsque la soupape (8) est réglée pour renvoyer le milieu vers la cuve (4) de la pompe, l'écoulement provenant de la pompe (2) est réglé en changeant la vitesse de rotation de la pompe.

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