A hydraulic circuit for linearly driving a movable...

B - Operations – Transporting – 21 – D

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B21D 7/08 (2006.01) F15B 11/04 (2006.01)

Patent

CA 2454062

A hydraulic circuit for linearly driving a movable roller-holder slider of a pipe bending machine, comprising a hydraulic cylinder (5) whose piston rod is connected to a slider holding a movable roller, the cylinder being fed with pressurized fluid from a reservoir (16) by a pump (15), through a three- position four-way valve (18), a check valve (12, 13) and an interposed throttling valve (19), that is operated to generate an increased pressure in said low pressure chamber of the hydraulic cylinder (5) in order to slow down the slider holding the upper roller in its primary motion when a programmable interval is reached from said predetermined position for each working pass.

L'invention concerne un circuit hydraulique destiné à la commande linéaire du coulisseau porte-rouleau mobile d'une machine à cintrer. Ce circuit comprend un cylindre hydraulique (5) dont la tige de piston est connectée à un coulisseau portant un rouleau mobile, ce cylindre étant alimenté en fluide sous pression issu d'un réservoir (16) par une pompe (15) via une soupape à quatre voies et à trois positions (18) ; un clapet de non-retour (12, 13) et une valve d'étranglement (19) intercalée qui fonctionne pour augmenter la pression dans cette chambre basse pression du cylindre hydraulique (5) afin de ralentir le coulisseau portant le rouleau supérieur dans son déplacement principal lorsqu'un intervalle programmable est atteint à partir de cette position prédéterminée pour chaque passe de travail.

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