Method and apparatus for semiactive reduction of pressure...

B - Operations – Transporting – 21 – B

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B21B 37/00 (2006.01)

Patent

CA 2745804

The invention relates to a method and an apparatus for semiactive reduction of pressure oscillations in a hydraulic system of a cold or hot rolling mill or strip handling installation for iron, steel or aluminum materials. The object of the invention is to provide a method and an apparatus by means of which pressure oscillations which occur can be effectively reduced by means of a simple and low-cost apparatus. This object is achieved by a method of the type mentioned initially, comprising the following method steps in the stated sequence: a) detection of a pressure signal by means of a pressure sensor by permanent measurement of a pressure in the hydraulic system; b) determination of an alternating component of the pressure signal; c) determination of at least one manipulated variable, which varies over time, in real time with the aid of a regulator, taking account of the alternating component; d)application of the manipulated variable to at least one actuator, with the actuator changing a natural frequency of an oscillation damper which is connected to the hydraulic system, and thus reducing an amplitude of the pressure oscillations in the hydraulic system.

L'invention concerne un procédé et un dispositif pour une réduction semi-active des fluctuations de pression dans un système hydraulique d'une chaîne de laminage à froid ou de laminage à chaud ou d'une installation de traitement de bande pour du fer, de l'acier ou de l'aluminium. L'invention concerne un dispositif et un procédé, selon lesquels les fluctuations de pression apparues peuvent être supprimées au moyen d'un dispositif simple et peu coûteux. A cet effet, le procédé susmentionné est mis en oeuvre et comprend les étapes suivantes consistant à: a) détecter le signal de pression grâce à un capteur de pression qui mesure en permanence la pression du système hydraulique; b) déterminer une partie alternative du signal de pression; c) déterminer au moins une variable modifiable dans le temps en temps réel à l'aide d'un contrôleur, la partie alternative étant prise en compte; d) soumettre au moins un activateur à la variable, l'activateur modifiant sa fréquence propre d'un amortisseur d'oscillations connecté au système hydraulique, l'amplitude des fluctuations de pression étant réduites dans le système hydraulique.

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