Method for simultaneous control of multiple accumulators

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 49/04 (2006.01) B29C 47/50 (2006.01) B29C 47/92 (2006.01) B29C 49/78 (2006.01)

Patent

CA 2264566

A method for cascade, closed loop control of multiple operating parameters for an extrusion blow molding machine having multiple accumulators is disclosed. The method provides closed loop control of the ram back pressure during refill, along with the closed loop adjustment of the pressure set points for "slave" accumulators based on a comparison of ram positions with that of a "master" accumulator. For systems that supply each accumulator with a separate extruder, the rotational speed of the extruder screw is the controlled operating parameter during refill. With respect to extrusion of the parisons, there is closed loop control of the ram velocity in conjunction with adjustment of the velocity set points for the slave accumulators based on a comparison of ram positions with that of the master accumulator.

L'invention a pour objet un procédé de commande en circuit fermé et en cascade de paramètres d'exploitation multiples, qui est destiné à une machine de moulage par extrusion-soufflage à accumulateurs multiples. Ledit procédé permet de commander en circuit fermé la contre-pression des coulisseaux au cours du remplissage et d'ajuster en circuit fermé les points de contrôle de pression pour des accumulateurs secondaires en fonction de la comparaison des positions des coulisseaux avec celles d'un accumulateur principal. Pour des systèmes où chaque accumulateur est associé à une extrudeuse, la vitesse de rotation de la vis de l'extrudeuse équivaut au paramètre d'exploitation commandé au cours du remplissage. Par rapport à l'extrusion des paraisons, l'invention fournit une commande en circuit fermé de la vitesse des coulisseaux en conjonction avec l'ajustement des points de contrôle de la vitesse pour les accumulateurs secondaires en fonction de la comparaison des positions des coulisseaux avec celles d'un accumulateur principal.

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