Valve block, tool attachment, a working machine and the use...

E - Fixed Constructions – 02 – F

Patent

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Details

E02F 3/96 (2006.01) E02F 3/36 (2006.01) F15B 11/00 (2006.01) F15B 20/00 (2006.01)

Patent

CA 2650731

The present invention relates to a valve block (1) disposed adjacent a tool attachment of a working machine, where the tool attachment is adapted for connection to different types of hydraulically manoeuvred tools or implements with the aid of a hydraulically actuated locking device (7). According to the invention, the valve block includes first port means (17, 18), second port means (19, 20) and third port means (21, 22) for connecting hydraulic lines (32, 33) of the working machine to hydraulic coupling elements (12) and to the locking device (7) respectively. The valve block includes a line system and valve means (2, 4, 5, and 6) which communicate with the port means so as to fulfil at least three of the following five functions: ensuring the presence of pressure in the locking device in the event of a - fracture in the hydraulic lines (32, 33) of the working machine ensuring connection of the first port means (17, 18) with either the second - port means (19, 20) or the third port means (21, 22) to obtain post-tensioning of the locking device (7) to relieve the pressure load and - to provide pressure limitation.

La présente invention concerne un bloc distributeur (1) disposé de manière adjacente à un porte-outil d'un engin de chantier, ledit porte-outil étant conçu pour pouvoir y connecter différents types d'outils ou équipements à commande hydraulique avec l'aide d'un dispositif de verrouillage (7) à commande hydraulique. Selon la présente invention, le bloc distributeur comporte des premiers orifices (17, 18), des deuxièmes orifices (19, 20) et des troisièmes orifices (21, 22) permettant de connecter des conduites hydrauliques (32, 33) de l'engin de chantier respectivement aux éléments de raccordement hydraulique (12) et au dispositif de verrouillage (7). Le bloc distributeur comprend un système de conduite et des soupapes (2, 4, 5 et 6) qui communiquent avec les orifices précités de manière à remplir au moins trois des cinq fonctions suivantes : garantir le maintien d'une pression dans le dispositif de verrouillage au cas où se produirait une rupture des conduites hydrauliques (32, 33) de l'engin de chantier ; garantir la connexion des premiers orifices (17, 18) soit avec les deuxièmes orifices (19, 20), soit avec les troisièmes orifices (21, 22) de manière à réaliser une postcontrainte du dispositif de verrouillage (7) afin de diminuer la charge de pression et de réaliser une limitation de la pression.

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