Variable multiple parison extrusion head having an...

B - Operations – Transporting – 29 – C

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B29C 47/92 (2006.01) B29C 47/22 (2006.01) B29C 49/04 (2006.01)

Patent

CA 2647046

Electrically operated actuator for modifying the thickness of the parisons during extrusion, by means of the usual means which modify the internal cross-section of the discharge mouths of the extrusion head and which are connected to a common cross-member (7) which may be guided by suitable means (107, 8) during the vertical movements, characterized in that the said cross-member is raised and lowered by means of mechanical systems which comprise at least connecting rods and cranks and which are actuated by a speed reducer (9) with limited play, which is fixed onto a support structure (102) positioned above the said cross-member (7) and moved by an electric motor (109) of suitable power, rotating in both directions and with electronic speed and phase control, for example a motor of the brushless type.

Actionneur à commande électrique servant à modifier l'épaisseur de paraisons au cours d'une extrusion, grâce à des moyens classiques modifiant la section transversale interne des orifices de décharge de la tête d'extrudeuse et qui sont reliés à une traverse commune (7) qui peut être guidée par des moyens adaptés (107, 8) au cours de mouvements verticaux. L'actionneur à commande électrique est caractérisé en ce que ladite traverse se soulève et s'abaisse grâce à des systèmes mécaniques qui comprennent au moins des bielles et des manivelles et qui sont actionnés par un réducteur de vitesse (9) à jeu réduit, lequel est fixé sur une structure porteuse (102) placée au-dessus de ladite traverse (7) et mue par un moteur électrique (109) d'une puissance adaptée, susceptible de tourner dans les deux sens et doté d'une commande électronique de vitesse et de phase, par exemple un moteur du type sans collecteur.

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