Fluid dispensing system

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 51/30 (2006.01) B05C 5/02 (2006.01) G03G 15/10 (2006.01)

Patent

CA 2305178

An apparatus and method for controlling the opening of a solenoid actuated valve (76) in a sealant dispensing gun (30) are disclosed. A proximity sensor (220) is provided adjacent a portion of a needle valve stem (64) in order to sense when the needle valve (70) has reached its open position. A dispense timer is initiated when the proximity sensor indicates that the needle valve (70) has reached its open position. In this manner, the needle valve (70) may be maintained in its open position for the desired dispense time only without regard to the response time of the solenoid valve (76). Also disclosed is an apparatus and method for adjusting the valve open limit of a sealant dispensing device (30) which incorporates a solenoid or motor actuated valve open limit device (120).

La présente invention concerne un procédé et un dispositif de commande de l'ouverture d'une électrovanne (76) d'un pistolet distributeur (30) pour matériau d'étanchéité. Un détecteur de proximité (220) est monté au voisinage d'une partie de la tige du robinet à pointeau (64) de façon à détecter l'instant où le robinet à pointeau a atteint la position ouverte. Une temporisation de distribution se déclenche lorsque le robinet à pointeau (64) a atteint la position ouverte. Cette façon de procéder permet de conserver le robinet à pointeau (64) ouvert uniquement pendant toute la durée de distribution, sans tenir compte du temps de réaction de l'électrovanne (76). L'invention concerne également un procédé et un dispositif de réglage de la limite d'ouverture du robinet d'un appareil de distribution (30) de produit d'étanchéité comportant un dispositif de limitation (120) d'ouverture de vanne actionné par un électro-aimant ou par un moteur.

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