Closing unit for injection moulding machine

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/67 (2006.01)

Patent

CA 2230726

A closing unit for an injection moulding machine has a movable closing die (20) and a fixed matching die (14) designed as clamping dies for an injection mould, as well as several hydraulic cylinders (26) mounted on the fixed matching die (14) to apply a closing force. A servo-drive (70) allows the drawbars (22) to swivel around their longitudinal axes up to a first and second angular position. First locking means (38) arranged on the drawbars (22) along a first section A of the drawbars co-operate with second locking means (36) arranged on the movable closing die (20). In the first angular position of the drawbars (22), the locking means (38, 36) allow the movable closing die (20) to move axially with respect to the drawbars (22), and in a second angular position of the drawbars (22) they transmit the required closing force.

L'unité de fermeture décrite pour une presse d'injection comprend un plateau de fermeture (20) mobile et un plateau complémentaire fixe (14) qui forment des plateaux de serrage d'un moule de coulage par injection, ainsi que plusieurs vérins hydrauliques (26) montés sur le plateau complémentaire fixe (14) pour générer une force de fermeture. Un mécanisme d'entraînement assisté (70) permet de faire pivoter les barres de traction (22) autour de leur axe longitudinal jusqu'à des première et deuxième positions angulaires. Des premiers moyens de verrouillage (38) situés sur les barres de traction (22) le long d'une première section A des barres coopèrent avec des deuxièmes moyens de verrouillage (36) situés sur le plateau mobile de fermeture (20). Dans la première position angulaire des barres de traction (22), les moyens de verrouillage (38, 36) permettent au plateau mobile de fermeture (20) de se déplacer axialement par rapport aux barres de traction (22), et dans la deuxième position angulaire des barres de traction (22), ils transmettent la force de fermeture requise.

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