EP0171487B1 - Device for the external closing of a vessel for molten metal - Google Patents

Device for the external closing of a vessel for molten metal Download PDF

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Publication number
EP0171487B1
EP0171487B1 EP19840870120 EP84870120A EP0171487B1 EP 0171487 B1 EP0171487 B1 EP 0171487B1 EP 19840870120 EP19840870120 EP 19840870120 EP 84870120 A EP84870120 A EP 84870120A EP 0171487 B1 EP0171487 B1 EP 0171487B1
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EP
European Patent Office
Prior art keywords
opening
movable plate
section
collecting nozzle
cross
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
Application number
EP19840870120
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German (de)
French (fr)
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EP0171487A1 (en
Inventor
Jean Bette
Clément Bienvenu
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.)
ROTARY NOZZLE INTERNATIONAL SA
Hepworth Refractories (Belgium) SA
Original Assignee
"rotary Nozzle International Sa"
"societe Belge Des Produits Refractaires En Abrege "belref"
"rotary Nozzle International Sa"
Hepworth Refractories (Belgium) SA
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Application filed by "rotary Nozzle International Sa", "societe Belge Des Produits Refractaires En Abrege "belref", "rotary Nozzle International Sa", Hepworth Refractories (Belgium) SA filed Critical "rotary Nozzle International Sa"
Priority to EP19840870120 priority Critical patent/EP0171487B1/en
Priority to DE8484870120T priority patent/DE3466861D1/en
Publication of EP0171487A1 publication Critical patent/EP0171487A1/en
Application granted granted Critical
Publication of EP0171487B1 publication Critical patent/EP0171487B1/en
Expired legal-status Critical Current

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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
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/24—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rectilinearly movable plate

Definitions

  • the subject of the present invention is an external closure device for a container containing molten metal, in particular a ladle for casting steel from a converter or an electric furnace in a continuous casting installation, comprising a fixed plate having at least one opening and made integral with the bottom of the container, a mobile plate provided with at least one opening, means arranged to firmly apply the mobile plate to the face of the fixed plate facing outwards from the container and to slide the face of the movable plate relative to the face of the fixed plate with which it is in contact to bring the opening of the movable plate opposite that of the fixed plate, an internal or upper nozzle fixed to the face of the fixed plate facing the inside of the container and surrounding the opening made in this plate to channel the molten metal towards this opening and a collecting nozzle fixed on the face of the movable plate opposite the fixed plate and surrounding the opening of this movable plate to collect the molten metal escaping through the openings of the fixed and movable plates placed partially or completely opposite one another.
  • the collecting nozzle In known external closure devices, the collecting nozzle, the role of which is to channel the metal jet flowing through the openings of the plates, has an internal conduit which has a practically constant section over its entire length, this section corresponding substantially to that of the opening of the movable plate. It is found in these devices that the throttling of the jet of molten metal, during the gradual matching of the openings of the fixed and mobile plates and especially at the start of casting where this throttling is the most significant, deviates the jet obliquely with respect to vertically and projects it forcefully onto a very localized part of the internal wall of the collecting nozzle which is generally not very thick, which not only has the drawback of causing accelerated wear of this part of the wall of the nozzle and therefore premature wear of the latter, but also the serious disadvantage of running the risk of an accidental breakthrough of the wall of the nozzle at the place where it undergoes the impact of the deflected jet of metal. In addition, these devices also have the disadvantage that the throttling of the metal jet,
  • the object of the invention is to remedy these drawbacks and to provide a closure device whose collector nozzle and especially the fixed and movable plates have a markedly increased longevity compared to that of known devices and which makes it possible to significantly reduce the risk of accidental breakthrough of the wall of the collecting nozzle under the action of the jet of molten metal.
  • the internal duct of the collecting nozzle has two adjacent parts, the first part, which extends from the end of the duct closest to the movable plate, having a section less than that of the opening presented by the movable plate, the second part of said internal conduit having a section greater than the section of the first part of this conduit.
  • the length of the first part of the internal conduit of the collecting nozzle is at most equal to one third of the length of said conduit.
  • the collecting nozzle has, at its end intended to cooperate with the movable plate, an additional thickness forming an external collar, the length of the first part of the internal duct of the collecting nozzle being at least equal to the corresponding dimension of this necklace.
  • the openings presented by the plates are substantially cylindrical, the internal conduit of the internal or upper nozzle being coaxial with the opening of the fixed plate, its section being substantially constant over its whole length and substantially equal to that of said opening, the internal conduit of the collecting nozzle being coaxial with the opening of the movable plate, the first and second parts of the latter conduit being substantially cylindrical.
  • the known closure device shown in Figures 1 to 3, and the closure device according to the invention, shown in Figures 4 to 7, are intended to ensure the external closure of a container 1 containing molten metal and in particular a ladle for casting molten steel from a converter or an electric furnace in a continuous casting installation.
  • These devices each comprise a fixed plate 2, provided with at least one aperture 3, integral with the bottom of the container, a movable plate 4 having at least one opening 5, means, not shown, arranged, on the one 'hand to firmly apply one on the other the faces 6 and 7 of the fixed and movable plate and, on the other hand, to slide the face 7 of the movable plate 4, relative to the face 6 of the fixed plate 2 with which it is in contact, to bring the opening 5 of the movable plate 4 partially or completely opposite the opening 3 of the fixed plate, an internal or upper nozzle 8, fixed to the face 9 of the fixed plate 2, which surrounds the opening 3 of the latter to channel the molten metal towards this opening 3 and a collecting nozzle 10, fixed to the face 11 of the movable plate 4, which surrounds the opening 5 formed in this plate 4, for collecting and channel the molten metal escaping through the openings 3 and 5 placed partially or totally opposite each other.
  • edges 14 of the openings 3 and 5 for throttling the jet wear out very quickly, which leads to the premature replacement of the plates 2 and 4 which are the most more expensive of the closing device.
  • the collecting nozzle 10 is arranged to straighten the jet of molten metal so that it does not strike a very localized area of the thin part of its wall.
  • this nozzle 10 no longer requires a throttling of the jet, at the start of casting, as pushed as in the known closure device, which has the effect of increasing the longevity of the fixed 2 and mobile 4 plates.
  • the internal conduit 15 of the collecting nozzle 10 of the device according to the invention has a first part 16 which extends from its end. mite closest to the movable plate 4 and whose cross section is less than that of the opening 5 of the movable plate, the cross section of the second part 17 of the conduit 15 being greater than that of the first part 16.
  • the cross section of this part 17 of the duct is either less than the section of the opening 5 of the movable plate 4, or equal to this section.
  • the first part 16 of the internal conduit 15 of the collecting nozzle causes the throttling and braking of the jet of molten liquid and therefore contributes to the throttling provided by the partial matching of the openings 3 and 5. Therefore, at the start of casting, for a total pressure drop equivalent to that of the known device, the surfaces of the reconciled openings can be larger and the edges 14 above said more spaced from each other, hence less wear of the fixed plates and mobile, which has a very important advantage in that in addition to their high cost, their replacement is a relatively long and complicated operation.
  • This part 16 of the internal conduit straightens, as shown in FIG. 4, the jet of molten metal shown diagrammatically by the arrow 12, so that this jet either has no more impact on a localized part of the thin wall of the lower part of the nozzle 10, that this impact is greatly reduced.
  • Part 16 is subjected, under the aforementioned service conditions at the start of casting, to relatively high wear, so that the internal section of the duct 15, in this part 16, gradually increases.
  • This characteristic is beneficial as the flow resistance of the molten metal decreases at the same time that the ladle empties and the ferrostatic pressure decreases.
  • the ratios section of part 16 / section of part 17 and section of opening 5 and height h of part 16 / total height H of nozzle 10 will be determined according to the duration of the pouring and the aggressiveness molten metal on the products constituting the plates and nozzle 10 (temperature and composition of the metal).
  • the collecting nozzle 10 has, at its end cooperating with the plate 4, an additional thickness forming an external collar 18.
  • the nozzle 10 which is rarely heated prior to casting the molten metal, is subjected at the start of casting to an extremely brutal thermal shock and the sensitive section of the nozzle to this shock is located at the connection point. of the nozzle and its aforementioned extra thickness. It is therefore beneficial to strengthen the nozzle at this location.
  • the execution according to the invention achieves this reinforcement when the height h. Of the aforementioned part 16 is greater than the height of the collar.
  • the openings 3 and 5 of the plates 2 and 4 are substantially cylindrical
  • the internal conduit of the upper nozzle 8 is coaxial with the opening 3 of the fixed plate and section is substantially constant over its entire length and substantially equal to that of the opening 3
  • the internal conduit 15 of the collecting nozzle 10 is coaxial with the opening 5 of the movable plate 4, the parts 16 and 17 of this conduit 15 being substantially cylindrical.
  • the movable plate 4 has, on its face 11 and on the periphery of the opening 5, an annular projection 19 coaxial with the latter.
  • This projection 19 is intended to cooperate with a corresponding recess 20 produced at the end of the nozzle 10 to be associated with the movable plate 4 and coaxial with the internal conduit 15 of said nozzle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Description

La présente invention a pour objet un dispositif de fermeture externe de récipient contenant du métal en fusion, en particulier d'une poche pour la coulée de l'acier provenant d'un convertisseur ou d'un four électrique dans une installation de coulée continue, comprenant une plaque fixe présentant au moins une ouverture et rendue solidaire du fond du récipient, une plaque mobile pourvue d'au moins une ouverture, des moyens agencés pour appliquer fermement la plaque mobile sur la face de la plaque fixe tournée vers l'extérieur du récipient et pour faire glisser la face de la plaque mobile par rapport à la face de Îa plaque fixe avec laquelle elle est en contact pour amener l'ouverture de la plaque mobile en regard de celle de la plaque fixe, une busette interne ou supérieure fixée à la face de la plaque fixe tournée vers l'intérieur du récipient et entourant l'ouverture pratiquée dans cette plaque pour canaliser le métal fondu vers cette ouverture et une busette collectrice fixée sur la face de la plaque mobile opposée à la plaque fixe et entourant l'ouverture de cette plaque mobile pour collecter le métal fondu s'échappant à travers les ouvertures des plaques fixe et mobile mises partiellement ou totalement en regard l'une de l'autre.The subject of the present invention is an external closure device for a container containing molten metal, in particular a ladle for casting steel from a converter or an electric furnace in a continuous casting installation, comprising a fixed plate having at least one opening and made integral with the bottom of the container, a mobile plate provided with at least one opening, means arranged to firmly apply the mobile plate to the face of the fixed plate facing outwards from the container and to slide the face of the movable plate relative to the face of the fixed plate with which it is in contact to bring the opening of the movable plate opposite that of the fixed plate, an internal or upper nozzle fixed to the face of the fixed plate facing the inside of the container and surrounding the opening made in this plate to channel the molten metal towards this opening and a collecting nozzle fixed on the face of the movable plate opposite the fixed plate and surrounding the opening of this movable plate to collect the molten metal escaping through the openings of the fixed and movable plates placed partially or completely opposite one another.

On sait que, en cas de coulée continue, le débit de métal en fusion à travers la lingotière de coulée continue doit être le plus régulier possible.It is known that, in the case of continuous casting, the flow of molten metal through the continuous casting mold must be as regular as possible.

Pour régulariser ce débit, malgré l'existence d'un répartiteur intermédiaire, on est amené à agir sur le dispositif de fermeture externe de la poche de coulée de la manière suivante : en début de coulée, on met partiellement en regard l'une de l'autre l'ouverture de la plaque mobile et l'ouverture de la plaque fixe afin d'étrangler le jet de métal en fusion et limiter ainsi le débit de ce dernier ; au fur et à mesure de l'abaissement du niveau du métal dans la poche et suite à la réduction de la pression ferrostatique qui en résulte, on augmente progressivement la surface desdites ouvertures en regard l'une de l'autre pour réduire l'étranglement du jet de métal et la perte de charge que cet étranglement provoque afin de maintenir sensiblement le même débit qu'en début de coulée.To regulate this flow rate, despite the existence of an intermediate distributor, it is necessary to act on the external closure device of the ladle as follows: at the start of casting, one of the the other the opening of the movable plate and the opening of the fixed plate in order to throttle the jet of molten metal and thus limit the flow thereof; as the level of the metal in the pocket decreases and following the reduction in the ferrostatic pressure which results therefrom, the surface of said openings facing each other is gradually increased to reduce the constriction of the metal jet and the pressure drop that this throttling causes in order to maintain substantially the same flow rate as at the start of casting.

Dans les dispositifs de fermeture externe connus, la busette collectrice, dont le rôle est de canaliser le jet de métal s'écoulant à travers les ouvertures des plaques, a un conduit interne qui a une section pratiquement constante sur toute sa longueur, cette section correspondant sensiblement à celle de l'ouverture de la plaque mobile. On constate dans ces dispositifs que l'étranglement du jet de métal en fusion, lors de la mise en concordance progressive des ouvertures des plaques fixe et mobile et surtout en début de coulée où cet étranglement est le plus important, dévie le jet obliquement par rapport à la verticale et projette celui-ci avec force sur une partie très localisée de la paroi interne de la busette collectrice qui est généralement peu épaisse, ce qui présente non seulement l'inconvénient de provoquer une usure accélérée de cette partie de paroi de la busette et par conséquent une usure prématurée de cette dernière, mais également le grave inconvénient de faire courir le risque d'une percée accidentelle de la paroi de la busette à l'endroit où celle-ci subit l'impact du jet dévié de métal. En outre, ces dispositifs présentent aussi l'inconvénient que l'étranglement du jet de métal, surtout en début de coulée où cet étranglement est maximum, provoque une usure accélérée des bords des ouvertures des plaques entre lesquels s'écoule le jet.In known external closure devices, the collecting nozzle, the role of which is to channel the metal jet flowing through the openings of the plates, has an internal conduit which has a practically constant section over its entire length, this section corresponding substantially to that of the opening of the movable plate. It is found in these devices that the throttling of the jet of molten metal, during the gradual matching of the openings of the fixed and mobile plates and especially at the start of casting where this throttling is the most significant, deviates the jet obliquely with respect to vertically and projects it forcefully onto a very localized part of the internal wall of the collecting nozzle which is generally not very thick, which not only has the drawback of causing accelerated wear of this part of the wall of the nozzle and therefore premature wear of the latter, but also the serious disadvantage of running the risk of an accidental breakthrough of the wall of the nozzle at the place where it undergoes the impact of the deflected jet of metal. In addition, these devices also have the disadvantage that the throttling of the metal jet, especially at the start of casting where this throttling is maximum, causes accelerated wear of the edges of the openings of the plates between which the jet flows.

L'invention a pour but de remédier à ces inconvénients et de procurer un dispositif de fermeture dont la busette collectrice et surtout les plaques fixe et mobile ont une longévité nettement accrue par rapport à celle des dispositifs connus et qui permet de réduire sensiblement le risque de percée accidentelle de la paroi de la busette collectrice sous l'action du jet de métal en fusion.The object of the invention is to remedy these drawbacks and to provide a closure device whose collector nozzle and especially the fixed and movable plates have a markedly increased longevity compared to that of known devices and which makes it possible to significantly reduce the risk of accidental breakthrough of the wall of the collecting nozzle under the action of the jet of molten metal.

A cet effet, suivant l'invention, le conduit interne de la busette collectrice présente deux parties adjacentes, la première partie, qui s'étend à partir de l'extrémité du conduit la plus proche de la plaque mobile, ayant une section inférieure à celle de l'ouverture présentée par la plaque mobile, la seconde partie dudit conduit interne ayant une section supérieure à la section de la première partie de ce conduit.To this end, according to the invention, the internal duct of the collecting nozzle has two adjacent parts, the first part, which extends from the end of the duct closest to the movable plate, having a section less than that of the opening presented by the movable plate, the second part of said internal conduit having a section greater than the section of the first part of this conduit.

Suivant une forme de réalisation du dispositif conforme à l'invention, la longueur de la première partie du conduit interne de la busette collectrice est tout au plus égale au tiers de la longueur dudit conduit.According to one embodiment of the device according to the invention, the length of the first part of the internal conduit of the collecting nozzle is at most equal to one third of the length of said conduit.

Suivant une mode de réalisation avantageux dudit dispositif, la busette collectrice présente, à son extrémité destinée à coopérer avec la plaque mobile, une surépaisseur formant un collier externe, la longueur de la première partie du conduit interne de la busette collectrice étant au moins égaie à la dimension correspondante de ce collier.According to an advantageous embodiment of said device, the collecting nozzle has, at its end intended to cooperate with the movable plate, an additional thickness forming an external collar, the length of the first part of the internal duct of the collecting nozzle being at least equal to the corresponding dimension of this necklace.

Suivant une forme de réalisation du dispositif selon l'invention, les ouvertures présentées par les plaques sont sensiblement cylindriques, le conduit interne de la busette interne ou supérieure étant coaxial à l'ouverture de la plaque fixe, sa section étant sensiblement constante sur toute sa longueur et sensiblement égale à celle de ladite ouverture, le conduit interne de la busette collectrice étant'coaxial à l'ouverture de la plaque mobile, les première et seconde parties de ce dernier conduit étant sensiblement cylindriques.According to one embodiment of the device according to the invention, the openings presented by the plates are substantially cylindrical, the internal conduit of the internal or upper nozzle being coaxial with the opening of the fixed plate, its section being substantially constant over its whole length and substantially equal to that of said opening, the internal conduit of the collecting nozzle being coaxial with the opening of the movable plate, the first and second parts of the latter conduit being substantially cylindrical.

D'autres détails et particularités de l'invention . ressortiront des dessins annexés au présent mémoire et qui représentent, à titre d'exemples non limitatifs, diverses formes de réalisation particulières de l'objet de l'invention.

  • Les figures 1 à 3 sont des vues schématiques, en élévation et en coupe, illustrant un dispositif de fermeture connu, la figure 1 montrant la position des ouvertures des plaques fixe et mobile en début de coulée, tandis que les figures 2 et 3 montrent leur position respectivement à mi-coulée et en fin de coulée.
  • Les figures 4 et 5 sont des vues, analogues aux figures 1 à 3, qui illustrent le dispositif suivant l'invention, la figure 4 montrant la position des ouvertures des plaques fixe et mobile en début de coulée tandis que la figure 5 montre leur position en fin de coulée.
  • La figure 6 est une vue en élévation et en coupe d'une variante de la busette collectrice illustrée aux figures 4 et 5.
  • La figure 7 est une vue analogue à la figure 6 et montre une autre variante de la busette collectrice illustrée aux figures 4 et 5.
Other details and features of the invention. Will emerge from the drawings appended to this specification and which represent, by way of nonlimiting examples, various particular embodiments of the subject of the invention.
  • Figures 1 to 3 are schematic views, in elevation and in section, illustrating a device known closure, FIG. 1 showing the position of the openings of the fixed and movable plates at the start of casting, while FIGS. 2 and 3 show their position respectively at mid-casting and at the end of casting.
  • Figures 4 and 5 are views, similar to Figures 1 to 3, which illustrate the device according to the invention, Figure 4 showing the position of the openings of the fixed and movable plates at the start of casting while Figure 5 shows their position at the end of casting.
  • FIG. 6 is a view in elevation and in section of a variant of the collecting nozzle illustrated in FIGS. 4 and 5.
  • FIG. 7 is a view similar to FIG. 6 and shows another variant of the collecting nozzle illustrated in FIGS. 4 and 5.

Dans les différentes figures, les mêmes notations de référence désignent des éléments identiques ou analogues.In the different figures, the same reference notations designate identical or analogous elements.

Le dispositif de fermeture connu, représenté aux figures 1 à 3, et le dispositif de fermeture suivant l'invention, représenté aux figures 4 à 7, sont destinés à assurer la fermeture externe d'un récipient 1 contenant du métal en fusion et en particulier d'une poche pour la coulée de l'acier en fusion provenant d'un convertisseur ou d'un four électrique dans une installation de coulée continue. Ces dispositifs comprennent chacun une plaque fixe 2, pourvue d'au moins une ouverture 3, solidaire du fond du récipient, une plaque mobile 4 présentant au moins une ouverture 5, des moyens, non représentés, agencés, d'une ' 'part pour appliquer fermement l'une sur l'autre les faces 6 et 7 des plaques fixe et mobile et, d'autre part, pour faire glisser la face 7 de la plaque mobile 4, par rapport à la face 6 de la plaque fixe 2 avec laquelle elle est en contact, pour amener l'ouverture 5 de la plaque mobile 4 partiellement ou totalement en regard de l'ouverture 3 de la plaque fixe, une busette interne ou supérieure 8, fixée à la face 9 de la plaque fixe 2, qui entoure l'ouverture 3 de cette dernière pour canaliser le métal fondu vers cette ouverture 3 et une busette collectrice 10, fixée à la face 11 de la plaque mobile 4, qui entoure l'ouverture 5 pratiquée dans cette plaque 4, pour collecter et canaliser le métal fondu s'échappant à travers les ouvertures 3 et 5 mises partiellement ou totalement en regard l'une de l'autre.The known closure device, shown in Figures 1 to 3, and the closure device according to the invention, shown in Figures 4 to 7, are intended to ensure the external closure of a container 1 containing molten metal and in particular a ladle for casting molten steel from a converter or an electric furnace in a continuous casting installation. These devices each comprise a fixed plate 2, provided with at least one aperture 3, integral with the bottom of the container, a movable plate 4 having at least one opening 5, means, not shown, arranged, on the one 'hand to firmly apply one on the other the faces 6 and 7 of the fixed and movable plate and, on the other hand, to slide the face 7 of the movable plate 4, relative to the face 6 of the fixed plate 2 with which it is in contact, to bring the opening 5 of the movable plate 4 partially or completely opposite the opening 3 of the fixed plate, an internal or upper nozzle 8, fixed to the face 9 of the fixed plate 2, which surrounds the opening 3 of the latter to channel the molten metal towards this opening 3 and a collecting nozzle 10, fixed to the face 11 of the movable plate 4, which surrounds the opening 5 formed in this plate 4, for collecting and channel the molten metal escaping through the openings 3 and 5 placed partially or totally opposite each other.

On constate, dans le dispositif de fermeture connu montré aux figures 1 à 3, qu'en début de coulée les parties d'ouvertures 3 et 5 mises en regard l'une de l'autre sont réduites pour étrangler le jet de métal en fusion. Cette disposition des ouvertures dévie le jet, schématisé par la flèche 12 (voirfigures 1 et 2) ce qui a pour effet de diriger celui-ci sur une zone étroite 13 de la busette collectrice 10, dont le conduit interne a une section sensiblement constante, et de provoquer une usure prématurée de cette dernière avec le risque de percée précité.It is noted, in the known closure device shown in Figures 1 to 3, that at the start of casting the parts of openings 3 and 5 facing each other are reduced to throttle the jet of molten metal . This arrangement of the openings deflects the jet, shown diagrammatically by the arrow 12 (see FIGS. 1 and 2), which has the effect of directing it over a narrow zone 13 of the collecting nozzle 10, the internal duct of which has a substantially constant section, and cause premature wear of the latter with the aforementioned risk of breakthrough.

De plus, vu l'espace réduit existant entre les bords 14 des ouvertures 3 et 5 pour l'étranglement du jet, ces bords 14 s'usent très rapidement, ce qui entraîne le remplacement prématuré des plaques 2 et 4 qui sont les organes les plus coûteux du dispositif de fermeture.In addition, given the reduced space existing between the edges 14 of the openings 3 and 5 for throttling the jet, these edges 14 wear out very quickly, which leads to the premature replacement of the plates 2 and 4 which are the most more expensive of the closing device.

En résumé, l'étranglement du jet et sa déviation. surtout en début de coulée, provoquent des dégâts aux plaques 2 et 4 et à la busette collectrice 10, sans parleT des risques de percée, avec les graves conséquences que cela peut comporter, de ladite busette collectrice.In summary, the throttling of the jet and its deflection. especially at the start of casting, cause damage to plates 2 and 4 and to the collecting nozzle 10, not to mention T the risks of breakthrough, with the serious consequences that this may entail, of said collecting nozzle.

Dans le dispositif suivant l'invention illustré aux figures 4 à 7, la busette collectrice 10 est agencée pour redresser le jet de métal en fusion pour qu'il ne percute pas une zone très localisée de la partie mince de sa paroi.In the device according to the invention illustrated in FIGS. 4 to 7, the collecting nozzle 10 is arranged to straighten the jet of molten metal so that it does not strike a very localized area of the thin part of its wall.

De plus, la configuration de cette busette 10 ne nécessite plus un étranglement du jet, en début de coulée, aussi poussé que dans le dispositif de fermeture connu, ce qui a pour effet d'accroître la longévité des plaques fixe 2 et mobile 4.In addition, the configuration of this nozzle 10 no longer requires a throttling of the jet, at the start of casting, as pushed as in the known closure device, which has the effect of increasing the longevity of the fixed 2 and mobile 4 plates.

Pour redresser le jet de métal en fusion, le conduit interne 15 de la busette collectrice 10 du dispositif suivant l'invention présente une première partie 16 qui s'étend à partir de son extré- . mité la plus proche de la plaque mobile 4 et dont la section est inférieure à celle de l'ouverture 5 de la plaque mobile, la section de la seconde partie 17 du conduit 15 étant supérieure à celle de la première partie 16. La section de cette partie 17 du conduit est soit inférieure à la section de l'ouverture 5 de la plaque mobile 4, soit égale à cette section.To straighten the jet of molten metal, the internal conduit 15 of the collecting nozzle 10 of the device according to the invention has a first part 16 which extends from its end. mite closest to the movable plate 4 and whose cross section is less than that of the opening 5 of the movable plate, the cross section of the second part 17 of the conduit 15 being greater than that of the first part 16. The cross section of this part 17 of the duct is either less than the section of the opening 5 of the movable plate 4, or equal to this section.

La première partie 16 du conduit interne 15 de la busette collectrice provoque l'étranglement et le freinage du jet de liquide en fusion et contribue donc à l'étranglement assuré par la mise en concordance partielle des ouvertures 3 et 5. Donc, en début de coulée, pour une perte de charge totale équivalente à celle du dispositif connu, les surfaces des ouvertures mises en concordance peuvent être plus importantes et les bords 14 susdits plus écartés l'un de l'autre, d'où usure moindre des plaques fixe et mobile, ce qui présente un avantage très important du fait qu'en plus de leur coût élevé, leur remplacement est une opération relativement longue et compliquée. Cette partie 16 du conduit interne redresse, comme montré à la figure 4, le jet de métal en fusion schématisé par la flèche 12, de sorte que ce jet, soit n'a plus d'impact sur une partie localisée de la paroi mince de la partie inférieure de la busette 10, soit que cet impact est fortement réduit.The first part 16 of the internal conduit 15 of the collecting nozzle causes the throttling and braking of the jet of molten liquid and therefore contributes to the throttling provided by the partial matching of the openings 3 and 5. Therefore, at the start of casting, for a total pressure drop equivalent to that of the known device, the surfaces of the reconciled openings can be larger and the edges 14 above said more spaced from each other, hence less wear of the fixed plates and mobile, which has a very important advantage in that in addition to their high cost, their replacement is a relatively long and complicated operation. This part 16 of the internal conduit straightens, as shown in FIG. 4, the jet of molten metal shown diagrammatically by the arrow 12, so that this jet either has no more impact on a localized part of the thin wall of the lower part of the nozzle 10, that this impact is greatly reduced.

Le redressement du jet et les parties des ouvertures 3 et 5 mises en concordance seront d'autant plus importantes, d'une part, que la section de la partie 16 du conduit est petite comparée à la section 17 dudit conduit et à la section de l'ouverture 5 et, d'autre part, que la hauteur h de cette partie 16 est importante comparée à la hauteur totale H de la busette 10.The straightening of the jet and the parts of the openings 3 and 5 brought into agreement will be all the more important, on the one hand, that the section of the part 16 of the duct is small compared to the section 17 of the said duct and to the section of the opening 5 and, on the other hand, that the height h of this part 16 is significant compared to the total height H of the nozzle 10.

La partie 16 est soumise, dans les conditions de service précitées de début de coulée à une usure relativement forte, si bien que la section interne du conduit 15, dans cette partie 16, augmente progressivement. Cette caractéristique est bénéfique étant donné que la résistance à l'écoulement du métal en fusion se réduit en même temps que la poche de coulée se vide et que la pression ferrostatique diminue.Part 16 is subjected, under the aforementioned service conditions at the start of casting, to relatively high wear, so that the internal section of the duct 15, in this part 16, gradually increases. This characteristic is beneficial as the flow resistance of the molten metal decreases at the same time that the ladle empties and the ferrostatic pressure decreases.

Les rapports section de la partie 16/section de la partie 17 et section de l'ouverture 5 et hauteur h de la partie 16/hauteur totale H de la busette 10 seront déterminés en fonction de la durée de la coulée et de l'agressivité du métal en fusion sur les produits constituant les plaques et busette 10 (température et composition du métal).The ratios section of part 16 / section of part 17 and section of opening 5 and height h of part 16 / total height H of nozzle 10 will be determined according to the duration of the pouring and the aggressiveness molten metal on the products constituting the plates and nozzle 10 (temperature and composition of the metal).

Plus la hauteur h sera importante, moins l'usure de la partie 16 sera rapide. Cette hauteur h sera tout au plus égal au tiers de la hauteur H de la busette 10.The greater the height h, the less the wear on part 16 will be rapid. This height h will be at most equal to a third of the height H of the nozzle 10.

Comme montré à la figure 6, la busette collectrice 10 présente, à son extrémité coopérant avec la plaque 4, une surépaisseur formant un collier externe 18.As shown in FIG. 6, the collecting nozzle 10 has, at its end cooperating with the plate 4, an additional thickness forming an external collar 18.

La busette 10, qui est rarement chauffée préala- .btement à la coulée du métal en fusion, est soumise en début de coulée à un choc thermique extrêmement brutal et la section sensible de la busette à ce choc est localisée à l'endroit de raccordement de la busette et de sa surépaisseur susdite. On a donc intérêt à renforcer la busette à cet endroit. L'exécution suivant l'invention réalise ce renforcement lorsque la hauteur h.de la partie 16 précitée est supérieure à la hauteur du collier.The nozzle 10, which is rarely heated prior to casting the molten metal, is subjected at the start of casting to an extremely brutal thermal shock and the sensitive section of the nozzle to this shock is located at the connection point. of the nozzle and its aforementioned extra thickness. It is therefore beneficial to strengthen the nozzle at this location. The execution according to the invention achieves this reinforcement when the height h. Of the aforementioned part 16 is greater than the height of the collar.

Dans toutes les formes de réalisation du dispositif suivant l'invention illustrées aux figures 4 et 7, les ouvertures 3 et 5 des plaques 2 et 4 sont sensiblement cylindriques, le conduit interne de la busette supérieure 8 est coaxial à l'ouverture 3 de la plaque fixe et de section est sensiblement constante sur toute sa longueur et sensiblement égale à celle de l'ouverture 3, le conduit interne 15 de la busette collectrice 10 est coaxial à l'ouverture 5 de la plaque mobile 4, les parties 16 et 17 de ce conduit 15 étant sensiblement cylindriques.In all of the embodiments of the device according to the invention illustrated in FIGS. 4 and 7, the openings 3 and 5 of the plates 2 and 4 are substantially cylindrical, the internal conduit of the upper nozzle 8 is coaxial with the opening 3 of the fixed plate and section is substantially constant over its entire length and substantially equal to that of the opening 3, the internal conduit 15 of the collecting nozzle 10 is coaxial with the opening 5 of the movable plate 4, the parts 16 and 17 of this conduit 15 being substantially cylindrical.

Dans la forme de réalisation du dispositif montré à la figure 7, la plaque mobile 4 présente, sur sa face 11 et sur le pourtour de l'ouverture 5, une saillie annulaire 19 coaxiale à cette dernière. Cette saillie 19 est destinée à coopérer avec un évidement 20 correspondant réalisé à l'extrémité de la busette 10 à associer à la plaque mobile 4 et coaxial au conduit interne 15 de ladite busette. On dispose donc, à l'endroit d'assemblage de la busette 10 à la plaque 4, d'une surface importante qui peut être enduite du matériau destiné à constituer le joint de liaison, d'où certitude d'obtenir un joint étanche.In the embodiment of the device shown in Figure 7, the movable plate 4 has, on its face 11 and on the periphery of the opening 5, an annular projection 19 coaxial with the latter. This projection 19 is intended to cooperate with a corresponding recess 20 produced at the end of the nozzle 10 to be associated with the movable plate 4 and coaxial with the internal conduit 15 of said nozzle. There is therefore, at the place of assembly of the nozzle 10 to the plate 4, a large surface which can be coated with the material intended to constitute the connection joint, hence the certainty of obtaining a tight seal.

On pourrait notamment prévoir, dans la forme de réalisation du dispositif illustré à la figure 7, de réaliser la saillie 19 sur la busette collectrice 10 et l'évidement correspondant dans la plaque mobile 4, cette façon de faire offrant l'avantage de permettre la réversibilité de la plaque 4.One could in particular provide, in the embodiment of the device illustrated in FIG. 7, to produce the projection 19 on the collecting nozzle 10 and the corresponding recess in the movable plate 4, this manner of doing offering the advantage of allowing the reversibility of the plate 4.

Claims (7)

1. Device for closing externally a vessel (1) containing molten metal, particularly a ladle for casting steel from a converter or an electric furnace in a continuous-casting equipment, comprising a fixed plate (2) having at least one opening (3) and being integral with the vessel bottom, a movable plate (4) provided with at least one opening (5), means so arranged as to press firmly the movable plate (4) against that side of the fixed plate (2) facing outwards of the vessel and to slide the side of the movable plate (4) relative to that side of the fixed plate (2) it does contact, to bring the opening (5) in the movable plate (4) facing the opening in the fixed plate, an inner or top nozzle (8) secured to that fixed plate side facing inwards of the vessel and surrounding the opening (3) provided in said plate to direct the molten metal to said opening, and a collecting nozzle (10) secured to that side of the movable plate (4) removed from the fixed plate and surrounding the opening (5) in said movable plate to collect the molten metal flowing through the openings (3, 5) in the fixed and movable plates facing partly or completely one another, said device being characterized in that the inner duct (15) of the collecting nozzle (10) has two adjacent parts (16, 17), the first part (16) which extends from that end of the duct (15) nearest the movable plate (4), having a smaller cross-section than the opening (5) provided in the movable plate (4), the second part (17) of said inner duct'(15) having a larger cross-sectton than the cross-section of the first part (16) of said duct.
2. Device according to claim 1, characterized in that the cross-section of the second part (17) of the inner duct (15) from the collecting nozzle (10) is either smaller than the cross-section of the opening (5) in the movable plate (4), or equal thereto.
3. Device according to either one of claims 1 and 2, characterized in that the length of the first part (16) of the inner duct (15) from the collecting nozzle (10) is at the most equal to one third the total length of said duct (15).
4. Device according to any one of claims 1 to 3, characterized in that the collecting nozzle (10) has on the end thereof which will cooperate with the movable plate (4), an overthickness forming an outer ring (18), the length of the first part (16) of the collecting nozzle inner duct (15) being longer than the corresponding dimension of said ring (18).
5. Device according to any one of claims 1 to 4, characterized in that the cross-section of the opening (5) provided in the movable plate (4) is . smaller than or equal to the cross-section of the opening (3) provided in the fixed plate (2).
6. Device according to any one of the claims 1 to 5, characterized in that the openings (3, 5) provided in the plates (2, 4) are substantially of cylinder shape, the inner duct of the inner or top nozzle (8) being co-axial with the opening (3) in the fixed plate (2), the cross-section thereof being substantially constant over the whole length thereof and substantially equal to the cross-section of said opening (3), the inner duct (15) of the collecting nozzle (10) being co-axial with the opening (5) in the movable plate (4), the first and second parts (16, 17) from said latter duct being substantially of cylinder shape.
7. Device according to claim 6, characterized in that the movable plate (4) has on that side (11) thereof facing the collecting nozzle (10) and on the circumference of the opening (5) thereof, a ring-like projection (19) co-axial with said opening, said ring-like projection cooperating with a corresponding recess (20) provided at that end of the collecting nozzle to be associated with the movable plate, said recess (20) being co-axial with the inner duct (15) of said collecting nozzle.
EP19840870120 1984-08-14 1984-08-14 Device for the external closing of a vessel for molten metal Expired EP0171487B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19840870120 EP0171487B1 (en) 1984-08-14 1984-08-14 Device for the external closing of a vessel for molten metal
DE8484870120T DE3466861D1 (en) 1984-08-14 1984-08-14 Device for the external closing of a vessel for molten metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19840870120 EP0171487B1 (en) 1984-08-14 1984-08-14 Device for the external closing of a vessel for molten metal

Publications (2)

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EP0171487A1 EP0171487A1 (en) 1986-02-19
EP0171487B1 true EP0171487B1 (en) 1987-10-21

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5198126A (en) * 1987-02-28 1993-03-30 Thor Ceramics Limited Tubular refractory product
US5866022A (en) * 1997-03-24 1999-02-02 North American Refractories Company Refractory pour tube with cast plate

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260081A (en) * 1978-08-07 1981-04-07 Pol Detalle Slide-valve output regulating throttle
DE3029529A1 (en) * 1980-08-04 1982-03-04 Didier-Werke Ag, 6200 Wiesbaden Bottom pour sliding stopper, esp. for vessels contg. molten steel - where adjacent holes in stopper slides have chamfers increasing resistance of slides to cracking

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DE3466861D1 (en) 1987-11-26
EP0171487A1 (en) 1986-02-19

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