B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/67 (2006.01) B29C 45/82 (2006.01) F15B 11/02 (2006.01) F15B 21/14 (2006.01)
Patent
CA 2338613
The invention relates to a hydrostatic drive system for an injection molding machine which has a movable mold-closing plate. Such a known drive system comprises a hydraulic pump and a differential hydraulic cylinder, by means of which the mold-closing plate can be moved in the direction of the closing position by the feeding of pressure medium into the second pressure space remote from the piston rod and can be moved in the direction of the open position by the feeding of pressure medium into the first pressure space on the piston-rod side. The aim of tho invention, for the movable mold-closing plate of an injection molding machine, is to provide a hydrostatic drive system in which only slight losses of energy which cannot be utilized occur. This aim is achieved by virtue of the fact that pressure medium can be delivered by the hydraulic pump into a pressure network having a hydraulic accumulator, and the first pressure space of the hydraulic cylinder is connected to the pressure network, and that the hydraulic cylinder is controlled via a hydraulic transformer which is of any desired construction in principle and is located with its primary-side pressure connection at the pressure network and via the secondary-side pressure connection of which pressure medium can be fed to the second pressure space of the hydraulic cylinder or discharged from the second pressure space. In such a hydrostatic drive system, the high demand for pressure medium when the mold-closing plate is being closed during the speed-increasing acceleration phase can be covered to a high degree from the hydraulic accumulator. During the braking of the mold-closing plate, the hydraulic transformer can help to recharge the hydraulic accumulator. During the dead time, during which the mold-closing plate is stationary, the hydraulic accumulator can continue to be filled by the hydraulic pump. According to an advantageous method of operating this hydrostatic drive system, the electric motor used for the drive of the hydraulic pump and adjustable in its rotational speed is in each case operated with a rotational speed of high efficiency and, if the desired charge pressure prevails in the hydraulic accumulator, is switched off.
L'invention a pour objet de créer, pour la plaque de fermeture de moule (10) mobile d'une presse d'injection, un système d'entraînement hydrostatique dans lequel ne se produisent que de faibles pertes en énergie non exploitable. A cet effet, un fluide hydraulique peut être refoulé depuis la pompe hydraulique (19) dans un réseau de pression (17, 24) présentant un accumulateur hydraulique (24), et la première chambre de pression (15) du vérin hydraulique (11) est raccordée au réseau de pression (17, 24). La commande de ce vérin hydraulique (11) est assurée par l'intermédiaire d'un transformateur hydraulique (18) de structure quelconque. Ce transformateur hydraulique comprend côté primaire un raccord de pression (32) raccordé au réseau de pression (17, 24), et côté secondaire un raccord de pression (34) par l'intermédiaire duquel un fluide hydraulique peut être acheminé à la deuxième chambre de pression (16) du vérin hydraulique (11) ou être évacué de celle-ci. Un tel système d'entraînement hydrostatique permet, lors de la fermeture de la plaque de fermeture de moule (10) pendant la phase d'accélération pour le passage en mode rapide, d'assurer la couverture des besoins élevés en fluide hydraulique, en grande partie par l'accumulateur hydraulique (24). Lors du freinage de la plaque de fermeture de moule (10), le transformateur hydraulique (18) peut contribuer à recharger l'accumulateur hydraulique (24). Au cours des temps morts pendant lesquels la plaque de fermeture de moule (10) est immobilisée, l'accumulateur hydraulique (24) peut être rempli à nouveau par la pompe hydraulique (19).
Bosch Rexroth Ag
Fetherstonhaugh & Co.
Mannesmann Rexroth Ag
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