Method and device for regulating the molten metal level in a...

B - Operations – Transporting – 22 – D

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B22D 11/18 (2006.01) B22D 11/20 (2006.01)

Patent

CA 2159475

The invention relates to a method for regulating the level of the meniscus (13) of molten metal in a mould (5) of a continuous casting machine, wherein the electric signals provided by at least one pair of sensors (17, 18) placed above said meniscus are collected, said signals being a function of the respective distances (h1, h2) between said sensors and said meniscus, said two signals being then combined so as to obtain a unique signal representative of a ficticious level of said meniscus, said signal being then sent to control means (15, 24) of a regulation device (14) which regulates the flow rate of metal entering the mould, so that said control means actuate said device in order to bring said ficticious level of the meniscus to a predetermined set value (h), caracterised in that each signal from the sensors is conditioned by eliminating the oscillations having both a frequency higher than a threshold value (F) and an amplitude smaller than a threshold value (D). The invention relates also to a combination mode of said signals, and to a device for implementing such method.

L'invention a pour objet un procédé de régulation du niveau du ménisque (13) du métal liquide dans une lingotière (5) d'une machine de coulée continue des métaux, selon lequel on recueille les signaux électriques fournis par au moins une paire de capteurs (17, 18) surplombant ledit ménisque, lesdits signaux étant fonction des distances respectives (h1, h2) entre lesdits capteurs et ledit ménisque, on combine ces deux signaux de manière à obtenir un signal unique représentatif d'un niveau fictif dudit ménisque, et on envoie ledit signal à des moyens de commande (15, 24) d'un dispositif (14) de régulation du débit de métal pénétrant dans la lingotière, pour que lesdits moyens de commande actionnent ledit dispositif de manière à ramener ledit niveau fictif dudit ménisque à une valeur de consigne prédéterminée (h), caractérisé en ce qu'on conditionne chaque signal issu desdits capteurs, en éliminant les oscillations ayant à la fois une fréquence supérieure à un seuil (F) et une amplitude inférieure à un seuil (D). L'invention concerne aussi un mode de combinaison desdits signaux, et un dispositif pour mettre en oeuvre ledit procédé.

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