EP0528724B1 - Installation for descaling a pouring stream protective tube in continuous casting - Google Patents

Installation for descaling a pouring stream protective tube in continuous casting Download PDF

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Publication number
EP0528724B1
EP0528724B1 EP92402259A EP92402259A EP0528724B1 EP 0528724 B1 EP0528724 B1 EP 0528724B1 EP 92402259 A EP92402259 A EP 92402259A EP 92402259 A EP92402259 A EP 92402259A EP 0528724 B1 EP0528724 B1 EP 0528724B1
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EP
European Patent Office
Prior art keywords
protective tube
installation
fact
descaling
sleeve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92402259A
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German (de)
French (fr)
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EP0528724A1 (en
Inventor
Gilbert Alberti
Serge Monte
Jacques Garcia
Ahmed Bahi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Publication of EP0528724A1 publication Critical patent/EP0528724A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/001—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like devices for cleaning ladles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/52—Manufacturing or repairing thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle

Definitions

  • the present invention relates to an installation for automatic cleaning of a protective tube for continuous casting jet.
  • This tube fixed at the end of the ladle's pouring hole, is immersed in the distributor in order to guide the jet, to avoid renitriding of the metal and its oxidation due to its contact with air, and avoid the entrainment of dross and slag present on the surface of the liquid metal contained in the distributor either towards the bottom, because of the emulsion generated by the fall of the metal from the ladle towards the distributor, or towards the outside of the dispenser due to possible splashing due to said fall.
  • the ladle is provided at its bottom with a tap hole with a vertical axis comprising a shutter drawer and means of temporary attachment to the jet protective tube such as a nozzle ensuring sealing.
  • the protective tube When the molten metal is poured, the protective tube is brought below the ladle and held with it in the axis of the tap hole.
  • This jet protective tube quickly becomes clogged during casting due to the solidification of the metal and its cleaning is necessary with each change of pocket.
  • the combustion of oxygen with the iron inside the protective tube acts as a torch, which makes it possible to remove the solidified metal in said protective tube.
  • the cleaning of the protective tube depends on the dexterity of the operator who works in a dark, congested environment near the ladle and the dispenser, so that cleaning the tube is not always well carried out which involves a risk of piercing the tube, a risk of resurgence due to plugging thereof as well as a risk of renitriding the metal due to a poor seal between the nozzle, the pocket and the protective tube.
  • the object of the present invention is to avoid these drawbacks by proposing an installation for automatic cleaning of a protective tube for a continuous casting jet.
  • a continuous casting installation is composed of a casting ladle 1 supported for example by a gantry not shown and containing liquid metal 2.
  • the ladle 1 is arranged above a distributor or distributor 3 supported by a casting floor 4 by suitable means.
  • the metal is guided by a jet protective tube 5.
  • the ladle 1 is of known type and provided at its bottom with a tap hole 6, of circular vertical axis and comprising, on the one hand, a shutter drawer 7 and, on the other hand, means 8 for momentary attachment of the protective tube 5 such as a nozzle ensuring sealing.
  • the distributor 3 located under the ladle 1 is filled with a bath of liquid metal 9 and is provided at its bottom with a hole 10 connected in a known manner to the casting line 11.
  • the jet protective tube 5 is a vertical tube of axis coincident with the axis of the tap hole 6 of the bag 1 and its lower end plunges into the bath 9 of liquid metal of the distributor 3 in order to avoid in particular the re-nitriding of the metal and its oxidation due to its contact with air.
  • This jet protective tube 5 quickly becomes clogged during casting due to the solidification of the metal and its cleaning is necessary at each change of pocket.
  • the subject of the present invention is an automatic installation 20 for cleaning the protective tube 5.
  • This installation shown schematically in FIG. 1 comprises the means for transferring the protective tube 5 between the ladle 1 and this installation and for maintaining this protective tube 5 in said installation.
  • a manipulator 21 supported by a gantry 22 ( Figures 1 and 2).
  • the manipulator 21 makes it possible to hold the protective tube 5 under the ladle 1 and moving said protective tube 5 between the ladle 1 and the scouring installation 20.
  • This manipulator 21 can be moved vertically by suitable means, not shown, and comprises an arm 23, horizontal which is provided at its free end with a member for engaging the protective tube 5, constituted for example by a rotary head.
  • the scouring installation 20 includes means for sucking up the fumes emitted during the scouring of the protective tube 5.
  • suction means consist of a hood 25 connected by a conduit 26 to a smoke filtration system not shown.
  • the scrub installation 20 also includes means for insufflating oxygen under pressure.
  • These oxygen blowing means comprise a scouring ball 27 which will be described in more detail later. and which is arranged below the hood 25.
  • the scouring ball 27 is supported by a support 28 disposed inside the hood 25 and is connected by a conduit 29 to oxygen supply means, not shown.
  • the scouring installation 20 includes means for recovering the metal leaving the protective tube 5 when it is scoured, constituted by a tank 30 made of bricks of refractory material and filled with sand.
  • the hood 25 is arranged above and at a certain distance from the tank 30 so as to provide sufficient space for the positioning of the protective tube 5 by the arm 23 of the manipulator 21.
  • the scouring ball 27 is formed of two parts, an end piece 40 of refractory material and a sleeve 41 of stainless steel.
  • the refractory material is for example graphite alumina.
  • the end piece 40 has, over part of its length, a blind bore 42.
  • this nozzle 40 comprises a cylindrical portion 40a delimited at one of its ends by a flat face 40b and at the other end by a spherical cap 40c.
  • the nozzle 40 also includes channels 43 for distributing oxygen which are inclined relative to the axis of said nozzle. These channels 43 diverge from the center of the spherical cap 40c towards its periphery and put the bore 42 into communication with the outside.
  • the channels 43 are for example six in number, as shown in FIG. 4.
  • the sleeve 41 comprises a central oxygen supply duct 41a and on its external surface, a first smooth portion 41b intended to be introduced into the bore 42 of the end piece 40, a second threaded portion 41c and a third portion 41d intended to be connected to conduit 29.
  • end piece 40 and the sleeve 41 are equipped with locking means between them which are constituted, in this exemplary embodiment, by a bayonet system 44 and by at least one nut 45 screwed onto the threaded portion 41c of the sleeve. 41 and intended to come to be applied on the flat upper part 40b of said nozzle.
  • a metal washer 46 is interposed between the nut 45 and the end piece 40.
  • the end piece 40 and the sleeve 41 can be glued.
  • the scouring ball 27 also consists of two parts, a tip 40 and a sleeve 41 inserted into said tip.
  • This end piece 40 comprises, as for the previous embodiment, a cylindrical portion 40a delimited at one of its ends by a flat face 40b and at the other end by a spherical cap 40c.
  • the sleeve 41 also includes a central oxygen supply duct 41a, and on its external face, a first smooth portion 41b, a second threaded portion 41c and a third portion 41d intended to be connected to the duct 29.
  • the bore 42 of the end piece 40 opens into a chamber 50 formed inside said end piece.
  • the channels 43 also open into this chamber 50 and are, in this case, parallel to the axis of the end piece 40. These channels are for example six in number.
  • the means for locking the sleeve 41 in the end piece 40 are constituted by a pin 51 passing through the end piece 40 and the portion 41b of the sleeve 41 disposed in said end piece and also by at least one nut 45 screwed onto the threaded portion 41c of the sleeve 41 and intended to come to bear on the upper part 40b of the end piece 40.
  • the end piece 40 and the sleeve 41 can be glued together.
  • the manipulator 21 supporting and pressing the protective tube 5 to the ladle 1 separates it from the latter.
  • the manipulator 21 transfers the protective tube 5 to the scouring installation 20 and positions this protective tube 5 in the axis of the scouring ball 27.
  • the manipulator 21 slightly raises the protective tube 5 to apply it under the scouring ball 27 as shown in FIG. 2 and the cleaning cycle can start.
  • the operator gradually opens a valve, not shown, located on the duct 29 outside the scouring installation 20.
  • the pressurized oxygen arrives through the conduit 29 enters the scouring ball and is diffused into the protective tube 5 through the channels 43.
  • the combustion of oxygen with the iron inside the protective tube 5 acts as a torch, which makes it possible to remove the solidified metal in said protective tube and the metal is recovered in the tank 30.
  • the fumes emitted during the cleaning of the protective tube 5 are recovered in the hood 25.
  • the cleaning of the protective tube 5 is finished when there is no longer any metal leaving said tube.
  • the operator cuts off the oxygen supply and the cleanliness of the protective tube 5 can be checked either visually or by a camera.
  • the protective tube thus cleaned is removed from the scouring installation, then transferred to the continuous casting installation for a new casting.
  • the scrub installation according to the present invention makes it possible to improve hygiene and safety since all the operations are controlled remotely.

Abstract

The subject of the present invention is an installation for automatically descaling a pouring stream protective tube (5) in continuous casting, comprising means (21, 23, 24) for holding a protective tube (5) under a continuous-casting ladle, for transferring the said tube (5) between a ladle and the descaling installation (20) and holding this protective tube (5) in the said installation, means (27, 29) for blowing pressurised oxygen into the protective tube (5), means (25, 26) for exhausting the fumes emitted during descaling of the protective tube (5), and means (30) for recovering the metal emerging from the protective tube when it is descaled. <IMAGE>

Description

La présente invention a pour objet une installation de décrassage automatique d'un tube protecteur de jet de coulée continue.The present invention relates to an installation for automatic cleaning of a protective tube for continuous casting jet.

Dans les installations de coulée continue, l'écoulement du métal liquide entre la poche de coulée et le distributeur s'effectue par passage dans un tube protecteur de jet.In continuous casting installations, the flow of liquid metal between the ladle and the distributor takes place by passage through a jet protective tube.

Ce tube, fixé à l'extrémité du trou de coulée de la poche, est plongé dans le distributeur afin de guider le jet, d'éviter le renitruration du métal et son oxydation du fait de son contact avec l'air, et d'éviter l'entraînement des crasses et du laitier présent à la surface du métal liquide contenu dans le distributeur soit vers le fond, du fait de l'émulsion engendrée par la chute du métal de la poche de coulée vers le distributeur, soit vers l'extérieur du distributeur du fait des éclaboussures éventuelles dues à ladite chute.This tube, fixed at the end of the ladle's pouring hole, is immersed in the distributor in order to guide the jet, to avoid renitriding of the metal and its oxidation due to its contact with air, and avoid the entrainment of dross and slag present on the surface of the liquid metal contained in the distributor either towards the bottom, because of the emulsion generated by the fall of the metal from the ladle towards the distributor, or towards the outside of the dispenser due to possible splashing due to said fall.

La poche de coulée est munie dans son fond d'un trou de coulée d'axe vertical comportant un tiroir obturateur et des moyens de solidarisation momentanée avec le tube protecteur de jet tels qu'une busette assurant l'étanchéité.The ladle is provided at its bottom with a tap hole with a vertical axis comprising a shutter drawer and means of temporary attachment to the jet protective tube such as a nozzle ensuring sealing.

Au moment de la coulée du métal liquide, le tube protecteur est amené au-desssous de la poche de coulée et maintenu avec celle-ci dans l'axe du trou de coulée.When the molten metal is poured, the protective tube is brought below the ladle and held with it in the axis of the tap hole.

Ce tube protecteur de jet s'encrasse rapidement au cours de la coulée du fait de la solidification du métal et son nettoyage est nécessaire à chaque changement de poche.This jet protective tube quickly becomes clogged during casting due to the solidification of the metal and its cleaning is necessary with each change of pocket.

Jusqu'à présent le nettoyage du tube protecteur est effectué manuellement en utilisant un tube à oxygène à une pression de 12 bars qui est appliqué sur l'entrée dudit tube protecteur.Up to now the cleaning of the protective tube is carried out manually using a tube with oxygen at a pressure of 12 bars which is applied to the inlet of said protective tube.

La combustion de l'oxygène avec le fer à l'intérieur du tube protecteur fait office de chalumeau, ce qui permet d'enlever le métal solidifié dans ledit tube protecteur.The combustion of oxygen with the iron inside the protective tube acts as a torch, which makes it possible to remove the solidified metal in said protective tube.

Mais, cette technique manuelle de décrassage présente des inconvénients et des dangers notamment pour la personne chargée de manipuler le tube à oxygène.However, this manual cleaning technique has drawbacks and dangers, in particular for the person responsible for handling the oxygen tube.

En effet, lors du soufflage de l 'oxygène dans le tube protecteur, il se produit un dégagement important de fumée réduisant la visibilité et des projections de métal en fusion et de poussières pouvant entraîner des brulûres graves pour l'opérateur.Indeed, during the blowing of oxygen into the protective tube, there is a significant release of smoke reducing visibility and splashes of molten metal and dust which can cause serious burns for the operator.

De plus, le décrassage du tube protecteur est fonction de la dextérité de l'opérateur qui travaille dans un environnement sombre, encombré et à proximité de la poche de coulée et du distributeur, si bien que le nettoyage du tube n'est pas toujours bien effectué ce qui entraîne un risque de perçage du tube, un risque de résurgence à cause du bouchage de celui-ci ainsi qu'un risque de renitruration du métal à cause d'une mauvaise étanchéité entre la busette, la poche et le tube protecteur.In addition, the cleaning of the protective tube depends on the dexterity of the operator who works in a dark, congested environment near the ladle and the dispenser, so that cleaning the tube is not always well carried out which involves a risk of piercing the tube, a risk of resurgence due to plugging thereof as well as a risk of renitriding the metal due to a poor seal between the nozzle, the pocket and the protective tube.

La présente invention a pour but d'éviter ces inconvénients en proposant une installation de décrassage automatique d'un tube protecteur de jet de coulée continue.The object of the present invention is to avoid these drawbacks by proposing an installation for automatic cleaning of a protective tube for a continuous casting jet.

La présente invention a donc pour objet une installation de décrassage automatique d'un tube protecteur de jet de coulée continue, caractérisée en ce qu'elle comporte :

  • des moyens de maintien du tube protecteur sous une poche de coulée continue, de transfert dudit tube entre la poche de coulée et l'installation de décrassage et de maintien de ce tube protecteur dans ladite installation,
  • des moyens d'insufflation d'oxygène sous pression dans le tube protecteur,
  • des moyens d'aspiration des fumées émises lors du décrassage du tube protecteur,
  • et des moyens de récupération du métal sortant du tube protecteur au moment de son décrassage, ces différents moyens étant commandés à distance.
The present invention therefore relates to an installation for automatic cleaning of a protective tube for a continuous casting jet, characterized in that it comprises:
  • means for holding the protective tube under a continuous casting ladle, for transferring said tube between the ladle and the installation for cleaning and holding this protective tube in said installation,
  • means for blowing pressurized oxygen into the protective tube,
  • means for extracting the fumes emitted during the cleaning of the protective tube,
  • and means for recovering the metal leaving the protective tube when it is scoured, these different means being remotely controlled.

Selon d'autres caractéristiques de l'invention :

  • les moyens d'insufflation d'oxygène sont formés par une boule de décrassage en matériau réfractaire comportant au moins un canal de distribution d'oxygène et reliée à des moyens d'alimentation en oxygène,
  • le matériau réfractaire est de l'alumine graphité,
  • la boule de décrassage est formée, d'une part, d'un embout muni, sur une partie de sa longueur, d'un alésage dans lequel débouche ledit canal de distribution et, d'autre part, d'un manchon pénétrant sur une partie de sa longueur dans l'alésage dudit embout et comportant un conduit central d'alimentation d'oxygène communiquant avec ledit canal de distribution,
  • l'embout et le manchon comportent des moyens de verrouillage entre eux,
  • les moyens de verrouillage sont formés par un système à baïonnette et par au moins un écrou vissé sur ledit manchon et destiné à venir s'appliquer sur la partie supérieure dudit embout,
  • les moyens de verrouillage sont formés par une goupille traversant l'embout et la partie du manchon disposée dans ledit embout et par au moins un écrou vissé sur ledit manchon et destiné à venir s'appliquer sur la partie supérieure de l'embout,
  • l'embout et le manchon sont collés entre eux,
  • les moyens d'aspiration des fumées sont formés par une hotte disposée au-dessus des moyens de récupération du métal et ménageant avec ceux-ci un espace pour le positionnement du tube protecteur,
  • la boule de décrassage est disposée au-dessous de la hotte.
According to other characteristics of the invention:
  • the oxygen blowing means are formed by a scum ball of refractory material comprising at least one oxygen distribution channel and connected to oxygen supply means,
  • the refractory material is graphite alumina,
  • the scouring ball is formed, on the one hand, by a nozzle provided, over part of its length, with a bore into which said distribution channel opens, and, on the other hand, by a sleeve penetrating a part of its length in the bore of said nozzle and comprising a central oxygen supply duct communicating with said distribution channel,
  • the end piece and the sleeve include locking means between them,
  • the locking means are formed by a bayonet system and by at least one nut screwed onto said sleeve and intended to be applied to the upper part of said end piece,
  • the locking means are formed by a pin passing through the end piece and the part of the sleeve disposed in said end piece and by at least one nut screwed onto said sleeve and intended to be applied to the upper part of the end piece,
  • the nozzle and the sleeve are glued together,
  • the smoke extraction means are formed by a hood placed above the metal recovery means and providing with them a space for positioning the protective tube,
  • the scouring ball is placed below the hood.

Les caractéristiques et avantages de la présente invention apparaîtront au cours de la description qui va suivre, donnée uniquement à titre d'exemple, faite en référence aux dessins annexés, sur lesquels :

  • la Fig. 1 est une vue schématique d'une installation de coulée continue,
  • la Fig. 2 est une vue schématique d'une installation de décrassage du tube protecteur de jet de coulée continue, selon la présente invention,
  • la Fig. 3 est une vue en coupe d'un premier mode de réalisation d'une boule de décrassage de l'installation selon la présente invention,
  • la Fig. 4 est une vue de dessous de la boule de décrassage de la Fig. 3,
  • la Fig. 5 est une vue en coupe d'un second mode de réalisation d'une boule de décrassage de l'installation selon la présente invention.
The characteristics and advantages of the present invention will appear during the description which follows, given solely by way of example, made with reference to the appended drawings, in which:
  • Fig. 1 is a schematic view of a continuous casting installation,
  • Fig. 2 is a schematic view of a scouring installation of the protective tube for continuous casting jet, according to the present invention,
  • Fig. 3 is a sectional view of a first embodiment of a scouring ball of the installation according to the present invention,
  • Fig. 4 is a bottom view of the scouring ball of FIG. 3,
  • Fig. 5 is a sectional view of a second embodiment of a scouring ball of the installation according to the present invention.

Comme représenté sur la Fig. 1, une installation de coulée continue est composée d'une poche de coulée 1 supportée par exemple par un portique non représenté et contenant du métal liquide 2.As shown in Fig. 1, a continuous casting installation is composed of a casting ladle 1 supported for example by a gantry not shown and containing liquid metal 2.

La poche de coulée 1 est disposée au-dessus d'un distributeur ou répartiteur 3 supporté par un plancher de coulée 4 par des moyens apppropriés.The ladle 1 is arranged above a distributor or distributor 3 supported by a casting floor 4 by suitable means.

Entre la poche de coulée 1 et le distributeur 3, le métal est guidé par un tube protecteur de jet 5.Between the ladle 1 and the distributor 3, the metal is guided by a jet protective tube 5.

La poche de coulée 1 est de type connu et munie dans son fond d'un trou de coulée 6, d'axe vertical circulaire et comportant, d'une part, un tiroir obturateur 7 et, d'autre part, des moyens 8 de solidarisation momentanée du tube protecteur 5 tels qu'une busette assurant l'étanchéité.The ladle 1 is of known type and provided at its bottom with a tap hole 6, of circular vertical axis and comprising, on the one hand, a shutter drawer 7 and, on the other hand, means 8 for momentary attachment of the protective tube 5 such as a nozzle ensuring sealing.

Le distributeur 3 situé sous la poche de coulée 1 est rempli d'un bain de métal liquide 9 et est muni dans son fond d'un trou 10 relié de manière connue à la ligne de coulée 11.The distributor 3 located under the ladle 1 is filled with a bath of liquid metal 9 and is provided at its bottom with a hole 10 connected in a known manner to the casting line 11.

Le tube protecteur de jet 5 est un tube vertical d'axe confondu avec l'axe du trou de coulée 6 de la poche 1 et son extrémité inférieure plonge dans le bain 9 de métal liquide du distributeur 3 afin d'éviter notamment la renitruration du métal et son oxydation du fait de son contact avec l'air.The jet protective tube 5 is a vertical tube of axis coincident with the axis of the tap hole 6 of the bag 1 and its lower end plunges into the bath 9 of liquid metal of the distributor 3 in order to avoid in particular the re-nitriding of the metal and its oxidation due to its contact with air.

Ce tube protecteur de jet 5 s'encrasse rapidement au cours de la coulée du fait de solidification du métal et son nettoyage est nécessaire à chaque changement de poche.This jet protective tube 5 quickly becomes clogged during casting due to the solidification of the metal and its cleaning is necessary at each change of pocket.

A cet effet, la présente invention a pour objet une installation automatique 20 de décrassage du tube protecteur 5.To this end, the subject of the present invention is an automatic installation 20 for cleaning the protective tube 5.

Cette installation représentée schématiquement à la Fig. 1 comporte les moyens de transfert du tube protecteur 5 entre la poche de coulée 1 et cette installation et de maintien de ce tube protecteur 5 dans ladite installation.This installation shown schematically in FIG. 1 comprises the means for transferring the protective tube 5 between the ladle 1 and this installation and for maintaining this protective tube 5 in said installation.

Ces moyens de transfert et de maintien du tube protecteur 5 sont formés par un manipulateur 21 supporté par un portique 22 (figures 1 et 2). Le manipulateur 21 permet de tenir le tube protecteur 5 sous la poche de coulée 1 et de déplacer ledit tube protecteur 5 entre la poche de coulée 1 et l'installation de décrassage 20.These means for transferring and holding the protective tube 5 are formed by a manipulator 21 supported by a gantry 22 (Figures 1 and 2). The manipulator 21 makes it possible to hold the protective tube 5 under the ladle 1 and moving said protective tube 5 between the ladle 1 and the scouring installation 20.

Ce manipulateur 21 est déplaçable verticalement par des moyens appropriés non représentés et comporte un bras 23, horizontal qui est muni à son extrémité libre d'un organe de prise du tube protecteur 5, constitué par exemple par une tête rotative.This manipulator 21 can be moved vertically by suitable means, not shown, and comprises an arm 23, horizontal which is provided at its free end with a member for engaging the protective tube 5, constituted for example by a rotary head.

L'installation de décrassage 20 comporte des moyens d'aspiration des fumées émises lors du décrassage du tube protecteur 5.The scouring installation 20 includes means for sucking up the fumes emitted during the scouring of the protective tube 5.

Ces moyens d'aspiration sont constitués par une hotte 25 reliée par un conduit 26 à un système de filtration des fumées non représenté.These suction means consist of a hood 25 connected by a conduit 26 to a smoke filtration system not shown.

L'installation de décrassage 20 comporte également des moyens d'insufflation d'oxygène sous pression.The scrub installation 20 also includes means for insufflating oxygen under pressure.

Ces moyens d'insufflation d'oxygène comprennent une boule de décrassage 27 qui sera décrite plus en détail ultérieurement. et qui est disposée au-dessous de la hotte 25.These oxygen blowing means comprise a scouring ball 27 which will be described in more detail later. and which is arranged below the hood 25.

La boule de décrassage 27 est supportée par un support 28 disposé à l'intérieur de la hotte 25 et est reliée par un conduit 29 à des moyens d'alimentation en oxygène non représentés.The scouring ball 27 is supported by a support 28 disposed inside the hood 25 and is connected by a conduit 29 to oxygen supply means, not shown.

Enfin, l'installation de décrassage 20 comporte des moyens de récupération du métal sortant du tube protecteur 5 au moment de son décrassage, constitués par un bac 30 en briques en matériau réfractaire et rempli de sable.Finally, the scouring installation 20 includes means for recovering the metal leaving the protective tube 5 when it is scoured, constituted by a tank 30 made of bricks of refractory material and filled with sand.

La hotte 25 est disposée au dessus et à une certaine distance du bac 30 de façon à ménager un espace suffisant pour le positionnement du tube protecteur 5 par le bras 23 du manipulateur 21.The hood 25 is arranged above and at a certain distance from the tank 30 so as to provide sufficient space for the positioning of the protective tube 5 by the arm 23 of the manipulator 21.

En se reportant maintenant aux Figs 3 et 4, on va décrire un premier mode de réalisation de la boule de décrassage 27.Referring now to Figs 3 and 4, a first embodiment of the scouring ball 27 will be described.

La boule de décrassage 27 est formée de deux parties, un embout 40 en matériau réfractaire et un manchon 41 en acier inoxydable.The scouring ball 27 is formed of two parts, an end piece 40 of refractory material and a sleeve 41 of stainless steel.

Le matériau réfractaire est par exemple de l'alumine graphité.The refractory material is for example graphite alumina.

L'embout 40 comporte sur une partie de sa longueur un alésage borgne 42.The end piece 40 has, over part of its length, a blind bore 42.

D'autre part, cet embout 40 comprend une portion cylindrique 40a délimitée à une de ses extrémités par une face plane 40b et à l'autre extrémité par une calotte sphériqne 40c.On the other hand, this nozzle 40 comprises a cylindrical portion 40a delimited at one of its ends by a flat face 40b and at the other end by a spherical cap 40c.

L'embout 40 comporte également des canaux 43 de distribution d'oxygène qui sont inclinés par rapport à l'axe dudit embout. Ces canaux 43 divergent du centre de la calotte sphérique 40c vers sa périphérie et mettent en communication l'alésage 42 avec l'extérieur.The nozzle 40 also includes channels 43 for distributing oxygen which are inclined relative to the axis of said nozzle. These channels 43 diverge from the center of the spherical cap 40c towards its periphery and put the bore 42 into communication with the outside.

Les canaux 43 sont par exemple au nombre de six, comme représenté à la Fig.4.The channels 43 are for example six in number, as shown in FIG. 4.

Le manchon 41 comporte un conduit central 41a d'alimentation en oxygène et sur sa surface externe, une première portion 41b lisse destinée à être introduite dans l'alésage 42 de l'embout 40, une seconde portion 41c filetée et une troisième portion 41d destinée à être raccordêe au conduit 29.The sleeve 41 comprises a central oxygen supply duct 41a and on its external surface, a first smooth portion 41b intended to be introduced into the bore 42 of the end piece 40, a second threaded portion 41c and a third portion 41d intended to be connected to conduit 29.

Lorsque le manchon 41 est placé dans l'embout 40, le conduit 41a, l'alésage 42 et les canaux 43 communiquent entre eux.When the sleeve 41 is placed in the end piece 40, the conduit 41a, the bore 42 and the channels 43 communicate with each other.

De plus, l'embout 40 et le manchon 41 sont équipés de moyens de verrouillage entre eux qui sont constitués, dans cet exemple de réalisation, par un système à baïonnette 44 et par au moins un écrou 45 vissé sur la portion filetée 41c du manchon 41 et destiné à venir s'appliquer sur la partie supérieure plane 40b dudit embout.In addition, the end piece 40 and the sleeve 41 are equipped with locking means between them which are constituted, in this exemplary embodiment, by a bayonet system 44 and by at least one nut 45 screwed onto the threaded portion 41c of the sleeve. 41 and intended to come to be applied on the flat upper part 40b of said nozzle.

Une rondelle métallique 46 est interposée entre l'écrou 45 et l'embout 40.A metal washer 46 is interposed between the nut 45 and the end piece 40.

Selon une autre variante, l'embout 40 et le manchon 41 peuvent être collés.According to another variant, the end piece 40 and the sleeve 41 can be glued.

Selon un autre mode de réalisation représenté à la Fig. 5, la boule de décrassage 27 est également constituée de deux parties, un embout 40 et un manchon 41 introduit dans ledit embout.According to another embodiment shown in FIG. 5, the scouring ball 27 also consists of two parts, a tip 40 and a sleeve 41 inserted into said tip.

Cet embout 40 comprend comme pour le précédent mode de réalisation, une portion cylindrique 40a délimitée à l'une de ses extrémité par une face plane 40b et à l'autre extrémité par une calotte sphérique 40c.This end piece 40 comprises, as for the previous embodiment, a cylindrical portion 40a delimited at one of its ends by a flat face 40b and at the other end by a spherical cap 40c.

Le manchon 41 comporte également un conduit central 41a d'alimentation en oxygène, et sur sa face externe, une première portion 41b lisse, une seconde portion 41c filetée et une troisième portion 41d destinée à être raccordée au conduit 29.The sleeve 41 also includes a central oxygen supply duct 41a, and on its external face, a first smooth portion 41b, a second threaded portion 41c and a third portion 41d intended to be connected to the duct 29.

Mais, dans ce mode de réalisation, l'alésage 42 de l'embout 40 débouche dans une chambre 50 ménagée à l'intérieur dudit embout.However, in this embodiment, the bore 42 of the end piece 40 opens into a chamber 50 formed inside said end piece.

Les canaux 43 débouchent également dans cette chambre 50 et sont, dans le cas présent, parallèles à l'axe de l'embout 40. Ces canaux sont par exemple au nombre de six.The channels 43 also open into this chamber 50 and are, in this case, parallel to the axis of the end piece 40. These channels are for example six in number.

Dans cet exemple de réalisation, les moyens de verrouillage du manchon 41 dans l'embout 40 sont constitués par une goupille 51 traversant l'embout 40 et la portion 41b du manchon 41 disposée dans ledit embout et également par au moins un écrou 45 vissé sur la portion filetée 41c du manchon 41 et destiné à venir s'appliquer sur la partie supérieure 40b de l'embout 40.In this exemplary embodiment, the means for locking the sleeve 41 in the end piece 40 are constituted by a pin 51 passing through the end piece 40 and the portion 41b of the sleeve 41 disposed in said end piece and also by at least one nut 45 screwed onto the threaded portion 41c of the sleeve 41 and intended to come to bear on the upper part 40b of the end piece 40.

L'embout 40 et le manchon 41 peuvent être collés entre eux.The end piece 40 and the sleeve 41 can be glued together.

L'installation qui vient d'être décrite fonctionne le la manière suivante.The installation which has just been described operates in the following manner.

Tout d'abord, le manipulateur 21 supportant et plaquant le tube protecteur 5 à la poche de coulée 1 le délolidarise de celle-ci.First of all, the manipulator 21 supporting and pressing the protective tube 5 to the ladle 1 separates it from the latter.

Le manipulateur 21 transfère le tube protecteur 5 vers l'installation de décrassage 20 et positionne ce tube protecteur 5 dans l'axe de la boule de décrassage 27.The manipulator 21 transfers the protective tube 5 to the scouring installation 20 and positions this protective tube 5 in the axis of the scouring ball 27.

Le manipulateur 21 monte légèrement le tube protecteur 5 pour l'appliquer sous la boule de décrassage 27 comme représentée, à la Fig. 2 et le cycle de décrassage peut commencer.The manipulator 21 slightly raises the protective tube 5 to apply it under the scouring ball 27 as shown in FIG. 2 and the cleaning cycle can start.

Pour cela, l'opérateur ouvre progressivement une vanne, non représentée, située sur le conduit 29 à l'extérieur de l'installation de décrassage 20.To do this, the operator gradually opens a valve, not shown, located on the duct 29 outside the scouring installation 20.

L'oxygène sous pression arrive par le conduit 29 pénètre dans la boule de décrassage et est diffusé dans le tube protecteur 5 par les canaux 43.The pressurized oxygen arrives through the conduit 29 enters the scouring ball and is diffused into the protective tube 5 through the channels 43.

La combustion de l'oxygène avec le fer à l'intérieur du tube protecteur 5 fait office de chalumeau ce qui permet d'enlever le métal solidifié dans ledit tube protecteur et le métal est récupéré dans le bac 30.The combustion of oxygen with the iron inside the protective tube 5 acts as a torch, which makes it possible to remove the solidified metal in said protective tube and the metal is recovered in the tank 30.

Les fumées émises lors du décrassage du tube protecteur 5 sont récupérées dans la hotte 25.The fumes emitted during the cleaning of the protective tube 5 are recovered in the hood 25.

Le décrassage du tube protecteur 5 est terminé lorsqu'il n'y a plus de métal qui sort dudit tube.The cleaning of the protective tube 5 is finished when there is no longer any metal leaving said tube.

Après le décrassage. l'opérateur coupe l'arrivée d'oxygène et la propreté du tube protecteur 5 peut être contrôlée soit visuellement, soit par une caméra.After the scrub. the operator cuts off the oxygen supply and the cleanliness of the protective tube 5 can be checked either visually or by a camera.

Ensuite, le tube protecteur ainsi nettoyé est retiré de l'installation de décrassage, puis transféré dans l'installation de coulée continue pour une nouvelle coulée.Then, the protective tube thus cleaned is removed from the scouring installation, then transferred to the continuous casting installation for a new casting.

L'installation de décrassage selon la présente invention permet d'améliorer l'hygiène et la sécurité puisque toutes les opérations sont commandées à distance.The scrub installation according to the present invention makes it possible to improve hygiene and safety since all the operations are controlled remotely.

Elle permet également d'effectuer un nettoyage plus efficace des tubes protecteurs de jet, d'augmenter par conséquent la durée de vie de ces tubes protecteurs et de diminuer les risques de résurgence et de renitruration.It also makes it possible to carry out a more effective cleaning of the jet protective tubes, consequently to increase the life of these protective tubes and to reduce the risks of resurgence and renitruration.

Claims (10)

  1. Installation for descaling a pouring stream protective tube (5) in continuous casting, characterised by the fact that it comprises:-
    · means (21, 23, 24) to hold the protective tube (5) under a continuous casting ladle (1), to transfer the said tube (5) between the pocket (1) and the descaling installation (2) and to hold this protective tube (5) in the said installation (20).
    · means (27) to blow pressurised oxygen into the protective tube (5),
    · suction means (25, 26) for fumes emitted whilst descaling the protective tube (5),
    · and means to recover the metal coming from the protective tube (5) during its descaling, these different means being remote controlled.
  2. Installation according to claim 1, characterised by the fact that the oxygen blowing means are formed by a descaling ball (27) in refractory material comprising at least one oxygen distribution channel (43) and connected to the oxygen supply means.
  3. Installation according to claim 2 characterised by the fact that the refractory material is graphite aluminium.
  4. Installation according to claim 2, characterised by the fact that the descaling ball (27) is formed, on one hand, by an end (40) fitted, on one part along its length, with a bore (42, 50) in to which the said distribution channel (43) opens and, on the other hand, a sleeve (41) which penetrates on one part of its length into the bore (42, 50) of the said end (40) and which comprises a central oxygen supply conduit (41a) which is connected to the said distribution channel (43).
  5. Installation according to claim 4 characterised by the fact that the end (40) and the sleeve (41) comprise locking means (44, 45, 51) between them.
  6. Installation according to claim 5, characterised by the fact that the locking means are formed by a bayonet system (44) and by at least one screw screwed on to the said sleeve (41) and designed to come into application on the upper part (40b) of the said end (40).
  7. Installation according to claim 5 characterised by the fact that the locking means are formed by a pin (51) which crosses the end (40) and part of the sleeve (41) which is located in the said end and by at least one screw (45) screwed onto the said sleeve (41) and designed to come into application on the upper part (40b) of the said end (40).
  8. Installation according to claim 4, characterised by the fact that the end (40) and the sleeve (41) are glued between them.
  9. Installation according to claim 5, characterised by the fact that the suction means for the fumes are formed by a canopy (25) located above the means (30) to recover the metal and which makes a space with the latter for the positioning of the protective tube (5).
  10. Installation according to any of the previous claims characterised by the fact that the descaling ball (27) is located above the canopy (25).
EP92402259A 1991-08-09 1992-08-07 Installation for descaling a pouring stream protective tube in continuous casting Expired - Lifetime EP0528724B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9110179A FR2680126B1 (en) 1991-08-09 1991-08-09 AUTOMATIC CLEANING INSTALLATION OF A CONTINUOUS CASTING JET PROTECTIVE TUBE.
FR9110179 1991-08-09

Publications (2)

Publication Number Publication Date
EP0528724A1 EP0528724A1 (en) 1993-02-24
EP0528724B1 true EP0528724B1 (en) 1995-12-06

Family

ID=9416098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402259A Expired - Lifetime EP0528724B1 (en) 1991-08-09 1992-08-07 Installation for descaling a pouring stream protective tube in continuous casting

Country Status (4)

Country Link
EP (1) EP0528724B1 (en)
AT (1) ATE131093T1 (en)
DE (1) DE69206521T2 (en)
FR (1) FR2680126B1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405797B (en) * 1996-04-16 1999-11-25 Voest Alpine Stahl Donawitz Method and apparatus for removing casting deposits from shrouds
EP2191918A1 (en) * 2008-11-20 2010-06-02 Vesuvius Group S.A Device for cleaning a pocket tube for pouring liquid metal
CN110280751B (en) * 2019-07-31 2021-06-15 广东韶钢松山股份有限公司 Long mouth of a river bowl cleaning device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT394818B (en) * 1986-10-22 1992-06-25 Stangl Kurt Dipl Ing Manipulator for attaching a pouring pipe to the pouring spout of a pouring ladle
FR2616365B1 (en) * 1987-06-11 1989-10-27 Clecim Sa IMPROVED CLOSURE DEVICE WITH CLEANING OF A CASTING HOLE
JPH0299250A (en) * 1988-09-30 1990-04-11 Kobe Steel Ltd Method for removing slag in tundish

Also Published As

Publication number Publication date
ATE131093T1 (en) 1995-12-15
EP0528724A1 (en) 1993-02-24
FR2680126A1 (en) 1993-02-12
DE69206521T2 (en) 1996-05-09
FR2680126B1 (en) 1993-11-19
DE69206521D1 (en) 1996-01-18

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