EP0913217B1 - Apparatus for spreading slag powder and continuous casting installation provided with such an apparatus - Google Patents

Apparatus for spreading slag powder and continuous casting installation provided with such an apparatus Download PDF

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Publication number
EP0913217B1
EP0913217B1 EP98420190A EP98420190A EP0913217B1 EP 0913217 B1 EP0913217 B1 EP 0913217B1 EP 98420190 A EP98420190 A EP 98420190A EP 98420190 A EP98420190 A EP 98420190A EP 0913217 B1 EP0913217 B1 EP 0913217B1
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EP
European Patent Office
Prior art keywords
powder
bath
distribution
movement
protruding
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EP98420190A
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German (de)
French (fr)
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EP0913217A1 (en
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Michel Dussud
Bernard Cumin
Franck Montegu
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D'etudes Et De Realisations Techniques Sert Ste
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D'etudes Et De Realisations Techniques Sert Ste
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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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like

Definitions

  • the molten metal is poured, in a known manner, into an ingot mold by through a tube of refractory material called "nozzle" which plunges into a bath of molten metal collected in the mold.
  • a layer of liquid slag is placed on the surface of this bath so as to protect the metal from oxidation. This layer is gradually entrained between the metal descending into the mold and the side walls thereof, ' which provides lubrication of the surfaces facing the ingot mold and metal bar being solidified.
  • These means include a hopper for receiving the powder, the lower end of which opens into a tube in which turns an Archimedes screw.
  • This tube allows the feeding in slag powder, by its lower part, of a number of distribution devices.
  • Each of these includes a frustoconical pocket leading to a nozzle oriented towards a specific area of the surface of the bath.
  • Each nozzle is associated with an axial air nozzle tablet for delivering the powder contained in the frustoconical pocket on the surface of the molten metal bath.
  • this distribution device has a drawback linked to its inability to distribute satisfactorily any type of slag powder.
  • powder some of which are granular, and have a good natural ability to distribute, and others are said to be powdery and have a low natural ability to distribute.
  • this has the effect of operating a progressive grinding of the powder circulating therein, so that a initially granular powder gradually has a powder structure which, as explained above, is detrimental to the quality of its distribution.
  • a device for distribution of slag powder on the surface of a molten metal comprising a powder reservoir closed by a background.
  • the latter which constitutes the reception area of the powder, is generally horizontal and extends to the vertical of a wall of the mold. This background allows the passage of a gas retained in a lower chamber.
  • the powder once mixed with gas, is then ejected above the mold pneumatically, in a direction substantially horizontal.
  • the invention proposes to overcome all of the drawbacks of the prior art mentioned above.
  • the means for distribution include a movable scraper member according to a direction of travel between a position retracted by relative to the bath and an advanced position relative to the bath, said scraping member comprising a suitable pushing surface ejecting said dose of powder during its movement between said retracted and advanced positions of the scraper member.
  • the distribution device allows to achieve the previously mentioned objectives. Indeed, it ensures a good distribution of the slag powder on the entire surface of the bath, as will be explained in look at the description below.
  • the volume of the dose delivered to the reception area can be perfectly known, depending on the powder flow level supply means and the time during which the powder is delivered from these supply means to the area reception.
  • the push surface is able to lift during movement of the scraper member between the advanced and retracted positions, so as to be distant from the receiving element of powder.
  • the thrust surface is able to pivot about an axis horizontal during movement of the scraping member between its advanced and retracted positions, and comes into abutment against the minus a protrusion of the scraping member during its movement between its retracted and advanced positions.
  • the device comprises at least one lateral retaining surface powder during the movement of the scraping member between its retracted position and its advanced position.
  • This retaining surface can be provided integral either with the scraping member or with the element powder reception.
  • the scraper member is provided with homogeneous distribution means powder on the powder receiving area.
  • the operation ejection of this dose is therefore reliable and allows a distribution satisfactory powder on the surface of the bath.
  • These homogeneous means of distribution may include a bow protruding from the vicinity of the thrust surface, towards the bath.
  • the scraping member comprises a core disposed substantially perpendicular to the direction of movement of the organ scraping and constituting the thrust surface, and two wings extending, on either side of the soul, towards the bath, and each constituting a lateral retaining surface.
  • the scraper member present, with a view to above, for example a U or U shape with inclined wings.
  • each wing is extended, at its distal end, by a deflector protruding both in the opposite direction to the soul and in the direction of the opposite wing.
  • the presence of these deflectors guarantee satisfactory powder distribution over the entire surface of the bath, in particular on the side of the nozzle opposite the dispensing device.
  • the scraper member slides between two parallel edges of which is provided with the powder receiving element.
  • the scraping member comprises two wings parallel
  • these edges allow the guiding of the scraping during its displacement.
  • the organ of scraping only includes a pushing surface
  • these edges parallels assume a guiding function, and constitute also a lateral powder retaining surface during its ejection.
  • the device comprises a covering cover, in the position retracted, from the scraping member, at least the receiving area powder, this cover being provided with at least one opening powder passage from the feed device powder.
  • the invention also relates to an installation for continuous casting comprising an ingot mold defining a volume for receiving a molten metal bath, a supply nozzle of molten metal, means for feeding powder dairy and means of distributing this powder to the surface of the molten metal bath, characterized in that the means of distributing slag powder include at minus a device as described above.
  • the means slag powder feed include means of homogeneous distribution of the powder dose over the receipt of each powder dispensing device.
  • the means of homogeneous distribution comprise at least one diffuser arranged on the powder flow path and widening towards the reception area, so that form at least two separate powder flows, on the one hand and on the other of the axis of movement of the scraping member.
  • the installation includes at least a couple of distribution as described above, each pair of devices being arranged facing each other on the nozzle.
  • the installation includes means ensuring the movement of supply means and powder distribution means.
  • the means of supply and distribution of powder can be mounted on a carriage running in parallel at the edge of the mold to allow distribution powder at several points for large molds width.
  • the powder supply means are provided with means for heating the powder.
  • these heating means allow to bring it to a temperature close to 300 at 400 ° C, so that the powder is more easily transformed into dairy, which ensures satisfactory lubrication of ingot molds of small section.
  • FIG. 1 shows a billet ingot mold, designated as a whole by the reference 2, and which will assume a rectangular section.
  • This mold has interior walls 4 and exterior walls 6, between which is defined a chamber 7 in which flows from cooling water.
  • the invention also finds its application to bloom molds.
  • a nozzle 8 placed in communication with a tank not represented, allows to deliver molten metal, which one will suppose to be steel, in the mold.
  • the nozzle 8, produced in refractory material, opens into a molten metal bath 10 which is in contact with the internal side walls 4 of the mold 2.
  • the metal partially solidifies on contact of the cooled walls of the mold, forming a bar which is extracted continuously from the end bottom of the mold using suitable rollers not represented.
  • a layer of slag 12 is placed on the upper surface of the bath 10 to protect the latter from oxidation.
  • the slag which is for example constituted by a easily fused silicate glass, is gradually driven by capillarity down, constituting a lubricating film which facilitates the descent of the solidified bar and reduces wear inner side walls 4 of the mold.
  • the casting installation continuous comprises a device 14 for feeding powder dairy, as well as a device 16 for distributing this powder on the surface of the bath 10 of the molten metal.
  • the feed device 14 includes a hopper 18 fed with slag powder.
  • the lower end of the hopper 18 is in communication with a tube 20 extending in direction of the bath 10, and inside which is disposed a Archimedes screw 22 driven by a motor 24.
  • the end of the tube 20, opposite the hopper 18, includes a nozzle 26 of powder spill. This nozzle 26 flares on the side and on the other side of the longitudinal axis of the tube 20.
  • the distribution device 16 comprises, like the show Figures 1 and 2, a plate 30 substantially horizontal constituting an element for receiving the powder of dairy.
  • the end 32 of the plate, closest to the bath 10, is substantially flush with the inner side wall 4B of the ingot mold 2.
  • a scraping member 34 which is constituted by a substantially U-shaped profile, is arranged on the face upper of the plate 30.
  • This profile 34 consists of a core 36 substantially parallel to the wall 4B, extended by two wings 38 extending horizontally towards the bath 10.
  • Each wing 38 is provided, at its distal end, with a deflector 40 protruding both in the opposite direction to the core 36, and in the direction of the opposite wing.
  • the core 36 is integral, at the level of its face opposite to the wings 38, of the rod 42 of a pneumatic type jack 44.
  • the profile 34 is therefore mobile, in direction D substantially perpendicular to its core 36, between a position retracted by relative to the bath and an advanced position relative to the bath.
  • the scraper member defines, with its core 36, its wings 38 and the end 32 of the plate 30, an area of reception 46 of the powder coming from the nozzle 26.
  • the advanced position of the profile 34 is shown in fine dashed lines in Figure 1, as well as solid lines in Figure 2. In this position, the face 36A of the most close to the wings 38 is substantially flush with the end 32 of the plate 30.
  • the jack 44 acts on the rod 42 so as to set the profile in motion 34 to its advanced position shown in phantom purposes in Figure 1, and to eject the powder dose 48.
  • This operation can be triggered either manually by a operator, either at a predetermined fixed rate, or again following an indication issued by a sensor, that the level of powder on the surface of the bath is insufficient.
  • the core 36 of the profile 34 constitutes a pushing surface of the powder dose 48, then that its wings 38 allow lateral retention of this powder.
  • Ejection of slag powder by means of profile 34 ensures a homogeneous distribution of this powder at the surface of the bath 10.
  • the speeds horizontal ejection, from the plate 30, of the different powder particles constituting the dose 46, are different between them.
  • the powder particles initially placed opposite the core 36 of the profile 34 are ejected at a relatively low speed, and are delivered to the surface of the bath, in the vicinity of the wall 4B adjacent to the distribution device 16, as shown by arrow F 1 .
  • the powder particles initially placed in the vicinity of the core 36 will be ejected with a significantly greater speed, and will be distributed in the vicinity of the wall 4A opposite the distribution device 16, as indicated by the arrow F 2 .
  • the powder particles initially placed in the center of the zone 46 follow an intermediate trajectory materialized by the arrow F 3 .
  • the speed with which the profile 34 is driven in translation must be adjusted so that the powder particles traveling the longest distance, come into contact with the surface of the bath 10 in the vicinity of the wall 4A.
  • the dose of powder 48 is ejected when it reaches a volume of 400 cm 3 .
  • the speed of the scraper member is 0.3 m / s and its stroke is 150 mm.
  • the dose of powder 48 is ejected when it reaches a volume of 160 cm 3 .
  • the speed of the scraper member is 0.4 m / s and its stroke is 110 mm.
  • the presence of the deflectors 40 ensures the distribution of slag powder, in zone 50 of the surface of the bath located opposite the plate 30.
  • the jack 44 acts on the rod 42 so as to return the profile 34 to its position retracted. Then, a new dose of powder is delivered to the level of the receiving surface 46 of the plate 30, and we repeats the ejection process described above.
  • Figure 3 shows an alternative embodiment of the device distribution according to the invention.
  • the latter designated by the reference 116, includes a plate 130 having 132 lateral flanges extending substantially along the axis of displacement A of the scraping member.
  • the latter includes a blade 134 vertical, extending substantially perpendicularly to axis A.
  • This blade 134 can be set in motion under the effect of the rod 142 of a jack, not shown, between positions retracted and advanced relative to the bath, analogously to scraping profile 30, in order to eject the powder dose above from the surface of the bath.
  • the blade 134 which constitutes a pushing surface of the powder during its ejection, is provided with a bow formed by a tetrahedral lug 148 protruding from the face of the blade opposite the rod 142. This lug ensures a better distribution of the dose powder delivered to reception area 146.
  • this distribution device described in FIG. 3 is similar to that of the device 16 described in Figures 1 and 2. It should be noted that during the movement of the blade 134 between its retracted position and its advanced position, the lateral edges 132 of the plate 130 assume both a function of guiding this blade, and of lateral retention powder.
  • FIG. 4 illustrates a third embodiment of the dispensing device according to the invention.
  • This last designated as a whole by the reference 216, includes a powder receiving element 230 formed by a plate having a central boss 231 on either side of which extend two lateral slides 231A.
  • This element of reception also includes side edges 232.
  • the distribution device 216 also includes a scraping device designated as a whole by the reference 234.
  • the latter comprises a basic body 235 having, in top view, generally a U-shape.
  • This basic body 235 is provided with side wings 238 terminated by deflectors 240 similar to those 40 shown in Figures 1 and 2.
  • Each wing 238 is provided with a lower rim 238A extending in direction of the opposite wing.
  • a projection 238B is provided on the upper face of each of these edges 238A.
  • the 235A upper face of the base body 235 is also partially closed and has, in the vicinity of the deflectors 240, a 235B U-shaped recess for the passage of the powder.
  • a flap 236 is pivotally mounted around an axis B passing through its upper face 236A, on the wings 238 of the body base 235, at orifices 238C thereof.
  • the blind 236 is articulated to the rod 242 of a jack not shown, by through a crosspiece 244 cooperating with yokes 245 with which section 236 is provided.
  • the latter presents, at level of its lower end 236B, a corresponding profile both at boss 231 and at slides 231A of the receiving element 230, so that it is able to slide on the upper surface of the latter.
  • This component 236 constitutes, as will be explained below, a surface powder pushing.
  • a bow 248 is fixed at the level of the upper face 235A of the basic body 235.
  • This bow has two sides 248A symmetrical about the longitudinal axis of the organ scraping, both protruding towards the element reception 230 and in the direction of the deflectors 240, that is to say, in service, in the direction of the molten metal bath.
  • the scraping member 234 is intended to be covered by a U-shaped top cover 249 whose wings 249A are fixed to the edges 232 of the receiving element 230.
  • This cover is provided with a substantially rectangular opening 249B, ensuring the passage of the powder from the supply device.
  • This supply device designated as a whole by the reference 214 includes, analogously to the device 14 shown in Figure 1, a tube 220 inside which is arranged an Archimedes screw not shown.
  • This tube is fixed to the cover 249 by means of fittings 221. It is provided at its end opposite to the actuation motor the screw, a nozzle 226 ensuring the pouring of the powder onto the receiving element 230.
  • This nozzle 226 is provided with a diffuser 228 formed by a recess in its walls, which allows to divide the powder flow coming from the tube 220, according to two distinct flows along passages 228A and 228B arranged on either side of the diffuser 228, and therefore of the axis A of displacement of the scraping member 234. This arrangement ensures a uniform distribution of the powder at the receiving element 230.
  • the scraping member 234 is movable between a position retracted shown in Figures 5A and 6A and a position projection shown in Figures 5B and 6B.
  • the front end of the wings 238 is substantially flush with the end before the receiving element 230.
  • the front end is, in use, adjacent to the bath.
  • the powder slag conveyed by the Archimedes screw pours out, level of nozzle 226, according to passages 228A, 228B formed at within it.
  • the symmetrical 248A faces of the bow ensure a good distribution of the powder, both on the central boss 231 and the slides 231A of the element reception, which constitute a reception area 246 of the powder.
  • the flap 236 In the advanced position of the scraping member, the flap 236 is substantially flush with the front end of the element reception 230. Once the powder has been ejected, the rod 242 acts on the flap 236 so as to move the scraping member 234 towards its retracted position. When moving, as shown in particular in FIG. 6A, the flap 236 tends to be lift backwards, under the effect of the traction exerted by rod 242, so as to limit the loss of powder residual during the return of the scraping member. Once this last returned to its retracted position, an additional dose powder can be admitted in the reception area 246 as soon as desired by the user, then ejected under the action of the scraping member 234.

Abstract

A device (16) for the distribution of slag powder on the surface of a bath of molten metal (10) in a continuous casting mould (2), of the type incorporating a receiving element (30) able to be fed by a powder feed device (14) and a means for distributing (34) the powder over the surface of the bath. The powder receiving element (30) incorporates a first end (32), close to the bath (10), extending as far as straight above a wall (4B) of the mould (2) in contact with the bath and is able to receive, at the level of a receiving zone (46) globally horizontal, a dose of powder (48). The means (34) for distributing the powder are able to eject, over the surface of the bath (10), the dose of powder (48) following a direction horizontal. An installation incorporating this device for distributing slag powder onto the surface of a bath of molten metal in a continuous casting mould is also claimed.

Description

La présente invention a trait à un dispositif de distribution de poudre de laitier sur la surface d'un bain de métal fondu reçu dans une lingotière de coulée continue, du type comprenant :

  • un élément de réception de poudre pouvant être alimenté par un dispositif d'alimentation de poudre et comprenant une première extrémité, proche du bain, qui s'étend sensiblement jusqu'à l'aplomb d'une paroi de la lingotière en contact avec le bain et est apte à recevoir au niveau d'une zone de réception globalement horizontale, une dose de poudre ; et
  • des moyens de répartition de poudre aptes à éjecter, au-dessus de la surface du bain, ladite dose de poudre selon une direction sensiblement horizontale.
The present invention relates to a device for distributing slag powder on the surface of a molten metal bath received in a continuous casting ingot mold, of the type comprising:
  • a powder receiving element which can be supplied by a powder supply device and comprising a first end, close to the bath, which extends substantially up to the vertical line of a wall of the mold in contact with the bath and is capable of receiving, at a generally horizontal reception zone, a dose of powder; and
  • powder distribution means capable of ejecting, above the surface of the bath, said dose of powder in a substantially horizontal direction.

Dans les installations de coulée continue, le métal fondu est déversé, de manière connue, dans une lingotière par l'intermédiaire d'un tube en matériau réfractaire dit "busette" qui plonge au sein d'un bain de métal fondu recueilli dans la lingotière. Une couche de laitier liquide est disposée sur la surface de ce bain de manière à protéger le métal de l'oxydation. Cette couche est progressivement entraínée entre le métal descendant dans la lingotière et les parois latérales de celle-ci,' ce qui assure la lubrification des surfaces en regard de la lingotière et de la barre de métal en cours de solidification.In continuous casting plants, the molten metal is poured, in a known manner, into an ingot mold by through a tube of refractory material called "nozzle" which plunges into a bath of molten metal collected in the mold. A layer of liquid slag is placed on the surface of this bath so as to protect the metal from oxidation. This layer is gradually entrained between the metal descending into the mold and the side walls thereof, ' which provides lubrication of the surfaces facing the ingot mold and metal bar being solidified.

Il est toutefois nécessaire de remplacer périodiquement cette couche de laitier en déversant dans la lingotière une poudre appropriée. On connaít, par FR-A-2 463 397, des moyens d'alimentation et de distribution d'une poudre de laitier à la surface du bain.It is however necessary to replace periodically this layer of slag by pouring into the mold an suitable powder. We know, by FR-A-2 463 397, means supply and distribution of slag powder to the bath surface.

Ces moyens comprennent une trémie de réception de la poudre, dont l'extrémité inférieure débouche dans un tube dans lequel tourne une vis d'Archimède. Ce tube permet l'alimentation en poudre de laitier, par sa partie inférieure, d'un certain nombre de dispositifs de distribution. Chacun de ceux-ci comprend une poche tronconique aboutissant à une buse orientée en direction d'une zone déterminée de la surface du bain. A chaque buse est associée une tuyère axiale à air comprimé permettant de délivrer la poudre contenue dans la poche tronconique sur la surface du bain de métal fondu.These means include a hopper for receiving the powder, the lower end of which opens into a tube in which turns an Archimedes screw. This tube allows the feeding in slag powder, by its lower part, of a number of distribution devices. Each of these includes a frustoconical pocket leading to a nozzle oriented towards a specific area of the surface of the bath. Each nozzle is associated with an axial air nozzle tablet for delivering the powder contained in the frustoconical pocket on the surface of the molten metal bath.

Ce dispositif de distribution présente toutefois un inconvénient lié à son inaptitude à distribuer de manière satisfaisante tout type de poudre de laitier. On sait en effet qu'il existe différentes sortes de poudre dont certaines sont granulaires, et possèdent une bonne capacité naturelle à se répartir, et d'autres sont dites pulvérulentes et possèdent une faible capacité naturelle à se répartir.However, this distribution device has a drawback linked to its inability to distribute satisfactorily any type of slag powder. We know that There are different kinds of powder, some of which are granular, and have a good natural ability to distribute, and others are said to be powdery and have a low natural ability to distribute.

Or, lorsque la poche tronconique d'un dispositif de distribution est rempli avec une poudre pulvérulente, ce dernier en assure seulement une distribution sensiblement ponctuelle, de sorte qu'il est nécessaire de prévoir un grand nombre de dispositifs de distribution pour couvrir de manière satisfaisante toute la surface du bain de métal fondu. Un autre inconvénient de ce dispositif de distribution connu réside dans le fait qu'il est nécessaire de prévoir un circuit fermé de re-circulation. En effet, si tel n'était pas le cas, la vis d'Archimède entraínant la poudre se bloquerait lors du remplissage des poches.However, when the frustoconical pocket of a dispenser is filled with a powdery powder, this the latter only ensures a distribution substantially punctual, so it is necessary to provide a large number of distribution devices to cover so satisfactory the entire surface of the molten metal bath. Another disadvantage of this known distribution device lies in the fact that it is necessary to provide a closed re-circulation circuit. Indeed, if this was not the case, the screw Archimedes entraining the powder would hang during filling pockets.

Outre la complexité et le coût liés à la présence de ce circuit de circulation, ce dernier a pour effet d'opérer un broyage progressif de la poudre qui y circule, de sorte qu'une poudre initialement granulaire possède petit à petit une structure pulvérulente ce qui, comme expliqué précédemment, est préjudiciable à la qualité de sa distribution.Besides the complexity and the cost linked to the presence of this circulation circuit, this has the effect of operating a progressive grinding of the powder circulating therein, so that a initially granular powder gradually has a powder structure which, as explained above, is detrimental to the quality of its distribution.

On connaít également, par FR-A-2 421 015, un dispositif de distribution de poudre de laitier à la surface d'un bain de métal fondu, comprenant un réservoir de poudre obturé par un fond. Ce dernier, qui constitue la zone de réception de la poudre, est globalement horizontal et s'étend jusqu'à l'aplomb d'une paroi de la lingotière. Ce fond permet le passage d'un gaz retenu dans une chambre inférieure. La poudre, une fois mélangée au gaz, est alors éjectée au-dessus de la lingotière de manière pneumatique, selon une direction sensiblement horizontale.We also know, from FR-A-2 421 015, a device for distribution of slag powder on the surface of a molten metal, comprising a powder reservoir closed by a background. The latter, which constitutes the reception area of the powder, is generally horizontal and extends to the vertical of a wall of the mold. This background allows the passage of a gas retained in a lower chamber. The powder, once mixed with gas, is then ejected above the mold pneumatically, in a direction substantially horizontal.

Cette solution connue présente cependant elle aussi certains inconvénients. En effet, étant donné que de l'air est projeté dans une zone où est présent du métal en fusion, ceci induit un risque important d'oxydation du métal. De plus, cette projection pneumatique provoque un éparpillement des poussières les plus fines présentes dans la poudre, ce qui est à l'origine de dépôts sur l'ensemble de l'installation de coulée continue, et se révèle très désagréable pour les opérateurs présents au voisinage de cette installation. Enfin, il est nécessaire d'utiliser un air parfaitement anhydre, ce qui implique l'emploi soit de filtres retenant l'eau, soit d'équipements permettant la condensation de cette eau. Dans l'un ou l'autre cas, cela s'avère désavantageux sur le plan économique.This known solution, however, also presents some disadvantages. Indeed, since air is projected in an area where molten metal is present, this induces a significant risk of metal oxidation. In addition, this pneumatic projection causes scattering of dust the finest present in the powder, which is the cause deposits on the entire continuous casting installation, and is very unpleasant for the operators present at the neighborhood of this facility. Finally, it is necessary to use perfectly anhydrous air, which implies using either water-retaining filters or equipment allowing the condensation of this water. In one or the other case it turns out to be economically disadvantageous.

L'invention se propose de pallier l'ensemble des inconvénients de l'art antérieur évoqués ci-dessus.The invention proposes to overcome all of the drawbacks of the prior art mentioned above.

A cet effet, elle a pour objet un dispositif de distribution du type précité, caractérisé en ce que les moyens de répartition comprennent un organe de raclage mobile selon une direction de déplacement entre une position rétractée par rapport au bain et une position avancée par rapport au bain, ledit organe de raclage comprenant une surface de poussée apte à éjecter ladite dose de poudre pendant son déplacement entre lesdites positions rétractée et avancée de l'organe de raclage.To this end, it relates to a distribution device of the aforementioned type, characterized in that the means for distribution include a movable scraper member according to a direction of travel between a position retracted by relative to the bath and an advanced position relative to the bath, said scraping member comprising a suitable pushing surface ejecting said dose of powder during its movement between said retracted and advanced positions of the scraper member.

Le dispositif de distribution suivant l'invention permet de réaliser les objectifs précédemment mentionnés. En effet, il assure une bonne répartition de la poudre de laitier sur l'ensemble de la surface du bain, comme cela sera explicité en regard de la description ci-après. De plus, le volume de la dose délivrée au niveau de la zone de réception peut être parfaitement connu, en fonction du débit de poudre au niveau des moyens d'alimentation et du temps pendant lequel la poudre est délivrée depuis ces moyens d'alimentation jusqu'à la zone de réception. Enfin, il n'est pas nécessaire de prévoir une re-circulation de poudre, dans la mesure où une fois que celle-ci est éjectée, la zone de réception est libre et peut recevoir une nouvelle dose de poudre.The distribution device according to the invention allows to achieve the previously mentioned objectives. Indeed, it ensures a good distribution of the slag powder on the entire surface of the bath, as will be explained in look at the description below. In addition, the volume of the dose delivered to the reception area can be perfectly known, depending on the powder flow level supply means and the time during which the powder is delivered from these supply means to the area reception. Finally, it is not necessary to provide for recirculation powder, as long as it is ejected, the reception area is free and can receive another dose of powder.

Etant donné qu'il est fait appel à un organe mécanique, les poussières fines présentes dans la poudre ne sont pas éparpillées durant l'opération d'éjection, qui assure une distribution homogène de la poudre. De plus, l'utilisation d'un organe mécanique permet de réaliser une distribution "sèche" de la poudre, ce qui évite tous les problèmes d'humidité de l'air, liés à la solution de l'art antérieur. Enfin, l'emploi de cet organe mécanique permet d'éviter toute oxydation du métal en fusion.Since a mechanical organ is used, the fine dust present in the powder is not scattered during the ejection operation, which ensures homogeneous distribution of the powder. In addition, the use of a mechanical organ allows a "dry" distribution of the powder, which avoids all the problems of air humidity, related to the solution of the prior art. Finally, the use of this mechanical organ avoids any oxidation of the metal in fusion.

Selon une caractéristique avantageuse de l'invention, la surface de poussée est apte à se relever pendant le déplacement de l'organe de raclage entre les positions avancée et rétractée, de manière à être distante de l'élément de réception de poudre.According to an advantageous characteristic of the invention, the push surface is able to lift during movement of the scraper member between the advanced and retracted positions, so as to be distant from the receiving element of powder.

Selon une caractéristique supplémentaire de l'invention, la surface de poussée est apte à pivoter autour d'un axe horizontal pendant le déplacement de l'organe de raclage entre ses positions avancée et rétractée, et vient en butée contre au moins une saillie de l'organe de raclage pendant son déplacement entre ses positions rétractée et avancée.According to an additional characteristic of the invention, the thrust surface is able to pivot about an axis horizontal during movement of the scraping member between its advanced and retracted positions, and comes into abutment against the minus a protrusion of the scraping member during its movement between its retracted and advanced positions.

Selon une caractéristique supplémentaire de l'invention, le dispositif comprend au moins une surface de retenue latérale de la poudre durant le déplacement de l'organe de raclage entre sa position rétractée et sa position avancée.According to an additional characteristic of the invention, the device comprises at least one lateral retaining surface powder during the movement of the scraping member between its retracted position and its advanced position.

Ceci permet d'éviter toute perte de poudre selon une direction perpendiculaire à la direction de déplacement de l'organe de raclage. Cette surface de retenue peut être prévue solidaire soit de l'organe de raclage, soit de l'élément de réception de poudre.This avoids any loss of powder according to a direction perpendicular to the direction of movement of the scraping member. This retaining surface can be provided integral either with the scraping member or with the element powder reception.

Selon une caractéristique supplémentaire de l'invention, l'organe de raclage est muni de moyens de répartition homogène de la poudre sur la zone de réception de poudre. L'opération d'éjection de cette dose est donc fiable et permet une répartition satisfaisante de la poudre sur la surface du bain. Ces moyens de répartition homogène peuvent comprendre une étrave faisant saillie, depuis le voisinage de la surface de poussée, en direction du bain.According to an additional characteristic of the invention, the scraper member is provided with homogeneous distribution means powder on the powder receiving area. The operation ejection of this dose is therefore reliable and allows a distribution satisfactory powder on the surface of the bath. These homogeneous means of distribution may include a bow protruding from the vicinity of the thrust surface, towards the bath.

Selon une caractéristique supplémentaire de l'invention, l'organe de raclage comprend une âme disposée sensiblement perpendiculairement à la direction de déplacement de l'organe de raclage et constituant la surface de poussée, et deux ailes s'étendant, de part et d'autre de l'âme, en direction du bain, et constituant chacune une surface de retenue latérale. Dans ce mode de réalisation, l'organe de raclage présente, en vue de dessus, par exemple une forme de U ou de U à ailes inclinées.According to an additional characteristic of the invention, the scraping member comprises a core disposed substantially perpendicular to the direction of movement of the organ scraping and constituting the thrust surface, and two wings extending, on either side of the soul, towards the bath, and each constituting a lateral retaining surface. In this embodiment, the scraper member present, with a view to above, for example a U or U shape with inclined wings.

Selon une caractéristique supplémentaire de l'invention, chaque aile est prolongée, à son extrémité distale, par un déflecteur faisant saillie à la fois en direction opposée à l'âme et en direction de l'aile opposée. La présence de ces déflecteurs garantit une distribution satisfaisante de poudre sur l'ensemble de la surface du bain, en partitulier du côté de la busette opposé au dispositif de distribution.According to an additional characteristic of the invention, each wing is extended, at its distal end, by a deflector protruding both in the opposite direction to the soul and in the direction of the opposite wing. The presence of these deflectors guarantee satisfactory powder distribution over the entire surface of the bath, in particular on the side of the nozzle opposite the dispensing device.

Selon une caractéristique supplémentaire de l'invention, l'organe de raclage coulisse entre deux rebords parallèles dont est pourvu l'élément de réception de poudre.According to an additional characteristic of the invention, the scraper member slides between two parallel edges of which is provided with the powder receiving element.

Dans le cas où l'organe de raclage comprend deux ailes parallèles, ces rebords permettent le guidage de l'organe de raclage durant son déplacement. Dans le cas où l'organe de raclage comprend uniquement une surface de poussée, ces rebords parallèles assument une fonction de guidage, et constituent également une surface de retenue latérale de la poudre durant son éjection.In the case where the scraping member comprises two wings parallel, these edges allow the guiding of the scraping during its displacement. In case the organ of scraping only includes a pushing surface, these edges parallels assume a guiding function, and constitute also a lateral powder retaining surface during its ejection.

Selon une caractéristique supplémentaire de l'invention, le dispositif comprend un capot recouvrant, dans la position rétractée, de l'organe de raclage, au moins la zone de réception de poudre, ce capot étant pourvu d'au moins une ouverture de passage de poudre depuis le dispositif d'alimentation de poudre. La présence de ce capot permet de limiter les pertes de poudre lors du déversement de celle-ci par gravité depuis le dispositif d'alimentation.According to an additional characteristic of the invention, the device comprises a covering cover, in the position retracted, from the scraping member, at least the receiving area powder, this cover being provided with at least one opening powder passage from the feed device powder. The presence of this cover makes it possible to limit the losses of powder when spilled by gravity from the feeding device.

L'invention a également pour objet une installation de coulée continue comprenant une lingotière définissant un volume de réception d'un bain de métal fondu, une busette d'alimentation en métal fondu, des moyens d'alimentation de poudre de laitier et des moyens de distribution de cette poudre à la surface du bain de métal fondu, caractérisée en ce que les moyens de distribution de poudre de laitier comprennent au moins un dispositif tel que décrit ci-dessus.The invention also relates to an installation for continuous casting comprising an ingot mold defining a volume for receiving a molten metal bath, a supply nozzle of molten metal, means for feeding powder dairy and means of distributing this powder to the surface of the molten metal bath, characterized in that the means of distributing slag powder include at minus a device as described above.

Selon une autre caractéristique de l'invention, les moyens d'alimentation de poudre de laitier comprennent des moyens de répartition homogène de la dose de poudre sur la zone de réception de chaque dispositif de distribution de poudre.According to another characteristic of the invention, the means slag powder feed include means of homogeneous distribution of the powder dose over the receipt of each powder dispensing device.

Selon une caractéristique supplémentaire de l'invention, les moyens de répartition homogène comprennent au moins un diffuseur disposé sur le trajet de l'écoulement de la poudre et s'évasant en direction de la zone de réception, de manière à former au moins deux flux de poudre distincts, de part et d'autre de l'axe de déplacement de l'organe de raclage.According to an additional characteristic of the invention, the means of homogeneous distribution comprise at least one diffuser arranged on the powder flow path and widening towards the reception area, so that form at least two separate powder flows, on the one hand and on the other of the axis of movement of the scraping member.

Selon une caractéristique supplémentaire de l'invention, l'installation comprend au moins un couple de dispositifs de distribution tel que décrit ci-dessus, chaque couple de dispositifs étant disposé en regard de part et d'autre de la busette.According to an additional characteristic of the invention, the installation includes at least a couple of distribution as described above, each pair of devices being arranged facing each other on the nozzle.

Selon une caractéristique supplémentaire de l'invention, l'installation comprend des moyens assurant le déplacement des moyens d'alimentation et des moyens de distribution de poudre. En particulier, les moyens d'alimentation et de distribution de poudre peuvent être montés sur un chariot circulant parallèlement au bord de la lingotière afin de permettre la distribution de poudre en plusieurs points pour les lingotières de grande largeur.According to an additional characteristic of the invention, the installation includes means ensuring the movement of supply means and powder distribution means. In particular, the means of supply and distribution of powder can be mounted on a carriage running in parallel at the edge of the mold to allow distribution powder at several points for large molds width.

Selon une caractéristique supplémentaire de l'invention, les moyens d'alimentation de poudre sont pourvus de moyens de chauffage de la poudre. En particulier, ces moyens de chauffage permettent de porter celle-ci à une température voisine de 300 à 400°C, de sorte que la poudre se transforme plus aisément en laitier, ce qui assure une lubrification satisfaisante des lingotières de faible section.According to an additional characteristic of the invention, the powder supply means are provided with means for heating the powder. In particular, these heating means allow to bring it to a temperature close to 300 at 400 ° C, so that the powder is more easily transformed into dairy, which ensures satisfactory lubrication of ingot molds of small section.

L'invention va être décrite ci-dessous, en référence aux dessins annexés, donnés uniquement à titre d'exemples non limitatifs et dans lesquels :

  • la figure 1 est une vue en coupe illustrant de manière schématique une lingotière de coulée continue pourvue d'un dispositif de distribution de poudre de laitier conforme à l'invention ;
  • la figure 2 est une vue schématique en perspective, illustrant la lingotière représentée à la figure 1 ;
  • la figure 3 est une vue analogue à la figure 2, illustrant un second mode de réalisation du dispositif de distribution conforme à l'invention ;
  • la figure 4 est une vue en perspective éclatée illustrant un troisième mode de réalisation d'un dispositif de distribution de l'invention ;
  • les figures 5A et 5B sont des vues en perspective illustrant le dispositif de distribution de la figure 4 une fois monté, dans les positions respectivement rétractée et avancée de l'organe de raclage, et
  • les figures 6A et 6B sont des coupes longitudinales des figures 5A et 5B.
The invention will be described below, with reference to the accompanying drawings, given only by way of nonlimiting examples and in which:
  • Figure 1 is a sectional view schematically illustrating a continuous casting mold provided with a slag powder distribution device according to the invention;
  • Figure 2 is a schematic perspective view illustrating the mold shown in Figure 1;
  • Figure 3 is a view similar to Figure 2, illustrating a second embodiment of the dispensing device according to the invention;
  • Figure 4 is an exploded perspective view illustrating a third embodiment of a dispensing device of the invention;
  • FIGS. 5A and 5B are perspective views illustrating the dispensing device of FIG. 4 once mounted, in the respectively retracted and advanced positions of the scraper member, and
  • Figures 6A and 6B are longitudinal sections of Figures 5A and 5B.

On a représenté à la figure 1 une lingotière à billettes, désignée dans son ensemble par la référence 2, et que l'on supposera de section rectangulaire. Cette lingotière comporte des parois intérieures 4 et des parois extérieures 6, entre lesquelles est définie une chambre 7 dans laquelle circule de l'eau de refroidissement. L'invention trouve également son application à des lingotières à bloom.FIG. 1 shows a billet ingot mold, designated as a whole by the reference 2, and which will assume a rectangular section. This mold has interior walls 4 and exterior walls 6, between which is defined a chamber 7 in which flows from cooling water. The invention also finds its application to bloom molds.

Une busette 8, mise en communication avec une cuve non représentée, permet de délivrer du métal fondu, qu'on supposera être de l'acier, dans la lingotière. La busette 8, réalisée en matériau réfractaire, débouche dans un bain de métal fondu 10 qui se trouve en contact avec les parois latérales internes 4 de la lingotière 2.A nozzle 8, placed in communication with a tank not represented, allows to deliver molten metal, which one will suppose to be steel, in the mold. The nozzle 8, produced in refractory material, opens into a molten metal bath 10 which is in contact with the internal side walls 4 of the mold 2.

De manière connue, le métal se solidifie en partie au contact des parois refroidies de la lingotière en formant une barre que l'on extrait en continu à partir de l'extrémité inférieure de la lingotière au moyen de galets appropriés non représentés. Une couche de laitier 12 est disposée sur la surface supérieure du bain 10 pour protéger ce dernier de l'oxydation. Le laitier, qui est par exemple constitué par un verre silicaté aisément fusible, est peu à peu entraíné par capillarité vers le bas, en constituant un film lubrifiant qui facilite la descente de la barre solidifiée et réduit l'usure des parois latérales intérieures 4 de la lingotière.In known manner, the metal partially solidifies on contact of the cooled walls of the mold, forming a bar which is extracted continuously from the end bottom of the mold using suitable rollers not represented. A layer of slag 12 is placed on the upper surface of the bath 10 to protect the latter from oxidation. The slag, which is for example constituted by a easily fused silicate glass, is gradually driven by capillarity down, constituting a lubricating film which facilitates the descent of the solidified bar and reduces wear inner side walls 4 of the mold.

Il est toutefois nécessaire de renouveler périodiquement la couche de laitier 12. A cet effet, l'installation de coulée continue comprend un dispositif 14 d'alimentation en poudre de laitier, ainsi qu'un dispositif 16 de distribution de cette poudre sur la surface du bain 10 du métal fondu.However, it is necessary to renew periodically the slag layer 12. For this purpose, the casting installation continuous comprises a device 14 for feeding powder dairy, as well as a device 16 for distributing this powder on the surface of the bath 10 of the molten metal.

Le dispositif 14 d'alimentation comprend une trémie 18 alimentée en poudre de laitier. L'extrémité inférieure de la trémie 18 est en communication avec un tube 20 s'étendant en direction du bain 10, et à l'intérieur duquel est disposée une vis d'Archimède 22 entraínée par un moteur 24. L'extrémité du tube 20, opposée à la trémie 18, comprend une buse 26 de déversement de la poudre. Cette buse 26 s'évase de part et d'autre de l'axe longitudinal du tube 20.The feed device 14 includes a hopper 18 fed with slag powder. The lower end of the hopper 18 is in communication with a tube 20 extending in direction of the bath 10, and inside which is disposed a Archimedes screw 22 driven by a motor 24. The end of the tube 20, opposite the hopper 18, includes a nozzle 26 of powder spill. This nozzle 26 flares on the side and on the other side of the longitudinal axis of the tube 20.

Le dispositif de distribution 16 comprend, comme le montrent les figures 1 et 2, une plaque 30 sensiblement horizontale constituant un élément de réception de la poudre de laitier. L'extrémité 32 de la plaque, la plus proche du bain 10, affleure sensiblement la paroi latérale intérieure 4B de la lingotière 2. Un organe de raclage 34, qui est constitué par un profilé sensiblement en forme de U, est disposé sur la face supérieure de la plaque 30. Ce profilé 34 est constitué d'une âme 36 sensiblement parallèle à la paroi 4B, prolongée par deux ailes 38 s'étendant horizontalement en direction du bain 10. Chaque aile 38 est pourvue, à son extrémité distale, d'un déflecteur 40 faisant saillie à la fois en direction opposée à l'âme 36, et en direction de l'aile opposée.The distribution device 16 comprises, like the show Figures 1 and 2, a plate 30 substantially horizontal constituting an element for receiving the powder of dairy. The end 32 of the plate, closest to the bath 10, is substantially flush with the inner side wall 4B of the ingot mold 2. A scraping member 34, which is constituted by a substantially U-shaped profile, is arranged on the face upper of the plate 30. This profile 34 consists of a core 36 substantially parallel to the wall 4B, extended by two wings 38 extending horizontally towards the bath 10. Each wing 38 is provided, at its distal end, with a deflector 40 protruding both in the opposite direction to the core 36, and in the direction of the opposite wing.

L'âme 36 est solidaire, au niveau de sa face opposée aux ailes 38, de la tige 42 d'un vérin 44 de type pneumatique. Le profilé 34 est donc mobile, selon la direction D sensiblement perpendiculaire à son âme 36, entre une position rétractée par rapport au bain et une position avancée par rapport au bain. Dans la position rétractée, représentée en traits pleins à la figure 1, l'organe de raclage délimite, avec son âme 36, ses ailes 38 et l'extrémité 32 de la plaque 30, une zone de réception 46 de la poudre en provenance de la buse 26.The core 36 is integral, at the level of its face opposite to the wings 38, of the rod 42 of a pneumatic type jack 44. The profile 34 is therefore mobile, in direction D substantially perpendicular to its core 36, between a position retracted by relative to the bath and an advanced position relative to the bath. In the retracted position, shown in solid lines at the Figure 1, the scraper member defines, with its core 36, its wings 38 and the end 32 of the plate 30, an area of reception 46 of the powder coming from the nozzle 26.

La position avancée du profilé 34 est représentée en traits mixtes fins à la figure 1, ainsi qu'en traits pleins à la figure 2. Dans cette position, la face 36A de l'âme la plus proche des ailes 38 affleure sensiblement l'extrémité 32 de la plaque 30.The advanced position of the profile 34 is shown in fine dashed lines in Figure 1, as well as solid lines in Figure 2. In this position, the face 36A of the most close to the wings 38 is substantially flush with the end 32 of the plate 30.

On va maintenant décrire la mise en oeuvre du dispositif de distribution de poudre de laitier conforme à l'invention, en faisant référence aux figures 1 et 2. La trémie 18 étant chargée de poudre, le moteur 24, en tournant, permet l'amenée de cette poudre au niveau de la buse 26 dont est pourvu le tube 20. La poudre se déverse alors par gravité au niveau de la zone de réception 46 de la plaque 30.We will now describe the implementation of the device distribution of slag powder according to the invention, in referring to Figures 1 and 2. The hopper 18 being loaded with powder, the motor 24, by turning, allows the supply of this powder at the nozzle 26 with which the tube is provided 20. The powder then pours out by gravity into the area receiving plate 46.

Il est alors facile de déterminer le volume de la dose 48 de poudre ainsi accumulé, connaissant le débit de poudre au niveau de la buse 26 et le temps durant lequel cette poudre s'est déversée. Lorsque la dose 48 présente le volume requis, on peut prévoir d'arrêter le mouvement de la vis 22.It is then easy to determine the volume of the dose 48 of powder thus accumulated, knowing the flow of powder at level of nozzle 26 and the time during which this powder spilled. When dose 48 has the required volume, provision can be made to stop the movement of the screw 22.

Lorsqu'il est nécessaire de délivrer de la poudre de laitier sur la surface du bain 10 de métal fondu, le vérin 44 agit sur la tige 42 de manière à mettre en mouvement le profilé 34 jusqu'à sa position avancée représentée en traits mixtes fins à la figure 1, et à éjecter la dose de poudre 48. Cette opération peut être déclenchée soit de façon manuelle par un opérateur, soit selon une cadence fixe prédéterminée, ou bien encore à la suite d'une indication délivrée par un capteur, selon laquelle le niveau de poudre à la surface du bain est insuffisant.When it is necessary to deliver powdered slag on the surface of the bath 10 of molten metal, the jack 44 acts on the rod 42 so as to set the profile in motion 34 to its advanced position shown in phantom purposes in Figure 1, and to eject the powder dose 48. This operation can be triggered either manually by a operator, either at a predetermined fixed rate, or again following an indication issued by a sensor, that the level of powder on the surface of the bath is insufficient.

Durant cette opération d'éjection, l'âme 36 du profilé 34 constitue une surface de poussée de la dose de poudre 48, alors que ses ailes 38 permettent une retenue latérale de cette poudre.During this ejection operation, the core 36 of the profile 34 constitutes a pushing surface of the powder dose 48, then that its wings 38 allow lateral retention of this powder.

L'éjection de la poudre de laitier au moyen du profilé 34 assure une distribution homogène de cette poudre au niveau de la surface du bain 10. En effet, on conçoit que les vitesses d'éjection horizontale, à partir de la plaque 30, des différentes particules de poudre constituant la dose 46, sont différentes entre elles.Ejection of slag powder by means of profile 34 ensures a homogeneous distribution of this powder at the surface of the bath 10. In fact, it is understood that the speeds horizontal ejection, from the plate 30, of the different powder particles constituting the dose 46, are different between them.

Ainsi, les particules de poudre initialement disposées à l'opposé de l'âme 36 du profilé 34 sont éjectées à une vitesse relativement faible, et sont délivrées à la surface du bain, au voisinage de la paroi 4B adjacente au dispositif de distribution 16, comme le montre la flèche F1. En revanche, les particules de poudre disposées initialement au voisinage de l'âme 36 seront éjectées avec une vitesse nettement plus importante, et seront distribuées au voisinage de la paroi 4A opposée au dispositif de distribution 16, comme l'indique la flèche F2. Enfin, les particules de poudre initialement disposées au centre de la zone 46, suivent une trajectoire intermédiaire matérialisée par la flèche F3. La vitesse avec laquelle le profilé 34 est entraíné en translation doit être réglée de sorte que les particules de poudre parcourant la plus grande distance, entrent en contact avec la surface du bain 10 au voisinage de la paroi 4A.Thus, the powder particles initially placed opposite the core 36 of the profile 34 are ejected at a relatively low speed, and are delivered to the surface of the bath, in the vicinity of the wall 4B adjacent to the distribution device 16, as shown by arrow F 1 . On the other hand, the powder particles initially placed in the vicinity of the core 36 will be ejected with a significantly greater speed, and will be distributed in the vicinity of the wall 4A opposite the distribution device 16, as indicated by the arrow F 2 . Finally, the powder particles initially placed in the center of the zone 46, follow an intermediate trajectory materialized by the arrow F 3 . The speed with which the profile 34 is driven in translation must be adjusted so that the powder particles traveling the longest distance, come into contact with the surface of the bath 10 in the vicinity of the wall 4A.

Ainsi, en supposant que la largeur de la lingotière est d'environ 320 mm, on éjecte la dose de poudre 48 lorsque celle-ci atteint un volume de 400 cm3. La vitesse de l'organe de raclage est de 0,3 m/s et sa course est de 150 mm.Thus, assuming that the width of the mold is about 320 mm, the dose of powder 48 is ejected when it reaches a volume of 400 cm 3 . The speed of the scraper member is 0.3 m / s and its stroke is 150 mm.

Dans le cas où la lingotière possède une largeur de 180 mm, on éjecte la dose de poudre 48 lorsque celle-ci atteint un volume de 160 cm3. La vitesse de l'organe de raclage est de 0,4 m/s et sa course est de 110 mm.In the case where the mold has a width of 180 mm, the dose of powder 48 is ejected when it reaches a volume of 160 cm 3 . The speed of the scraper member is 0.4 m / s and its stroke is 110 mm.

La présence des déflecteurs 40 permet d'assurer la distribution en poudre de laitier, au niveau de la zone 50 de la surface du bain située à l'opposé de la plaque 30.The presence of the deflectors 40 ensures the distribution of slag powder, in zone 50 of the surface of the bath located opposite the plate 30.

Après éjection de la dose 48, le vérin 44 agit sur la tige 42 de manière à faire revenir le profilé 34 dans sa position rétractée. Puis, une nouvelle dose de poudre est délivrée au niveau de la surface de réception 46 de la plaque 30, et on réitère le processus d'éjection décrit ci-dessus.After ejection of the dose 48, the jack 44 acts on the rod 42 so as to return the profile 34 to its position retracted. Then, a new dose of powder is delivered to the level of the receiving surface 46 of the plate 30, and we repeats the ejection process described above.

On peut prévoir d'adjoindre un dispositif de distribution supplémentaire analogue à celui 16 représenté aux figures 1 et 2. Ce dispositif supplémentaire, représenté en traits pointillés à la figure 1, est disposé en regard du dispositif 16, de manière symétrique à celui-ci par rapport à la busette 8. Les deux dispositifs de distribution ainsi réalisés peuvent assurer l'éjection de doses de poudre successives.We can plan to add a distribution device additional similar to that 16 shown in Figures 1 and 2. This additional device, shown in dotted lines in Figure 1, is arranged opposite the device 16, symmetrical to it with respect to the nozzle 8. The two distribution devices thus produced can ensure ejecting successive doses of powder.

On peut également prévoir plusieurs couples de dispositifs de distribution disposés les uns à côté des autres, dans le cas d'un bain de métal fondu de dimensions plus importantes.Several pairs of devices can also be provided distribution arranged next to each other, in the case a molten metal bath of larger dimensions.

La figure 3 montre une variante de réalisation du dispositif de distribution conforme à l'invention. Ce dernier, désigné par la référence 116, comprend une plaque 130 présentant des rebords 132 latéraux s'étendant sensiblement selon l'axe de déplacement A de l'organe de raclage. Ce dernier comprend une lame 134 verticale, s'étendant sensiblement de manière perpendiculaire à l'axe A.Figure 3 shows an alternative embodiment of the device distribution according to the invention. The latter, designated by the reference 116, includes a plate 130 having 132 lateral flanges extending substantially along the axis of displacement A of the scraping member. The latter includes a blade 134 vertical, extending substantially perpendicularly to axis A.

Cette lame 134 peut être mise en mouvement sous l'effet de la tige 142 d'un vérin non représenté, entre des positions rétractée et avancée par rapport au bain, de manière analogue au profilé de raclage 30, afin d'éjecter la dose de poudre au-dessus de la surface du bain. La lame 134 qui constitue une surface de poussée de la poudre durant son éjection, est pourvue d'une étrave formée par un ergot 148 tétraédrique faisant saillie à partir de la face de la lame opposée à la tige 142. Cet ergot assure une meilleure répartition de la dose de poudre délivrée au niveau de la zone de réception 146.This blade 134 can be set in motion under the effect of the rod 142 of a jack, not shown, between positions retracted and advanced relative to the bath, analogously to scraping profile 30, in order to eject the powder dose above from the surface of the bath. The blade 134 which constitutes a pushing surface of the powder during its ejection, is provided with a bow formed by a tetrahedral lug 148 protruding from the face of the blade opposite the rod 142. This lug ensures a better distribution of the dose powder delivered to reception area 146.

Le fonctionnement de ce dispositif de distribution décrit à la figure 3 est analogue à celui du dispositif 16 décrit aux figures 1 et 2. Il est a noter que, durant le déplacement de la lame 134 entre sa position rétractée et sa position avancée, les rebords latéraux 132 de la plaque 130 assument à la fois une fonction de guidage de cette lame, et de retenue latérale de la poudre.The operation of this distribution device described in FIG. 3 is similar to that of the device 16 described in Figures 1 and 2. It should be noted that during the movement of the blade 134 between its retracted position and its advanced position, the lateral edges 132 of the plate 130 assume both a function of guiding this blade, and of lateral retention powder.

La figure 4 illustre un troisième mode de réalisation du dispositif de distribution conforme à l'invention. Ce dernier, désigné dans son ensemble par la référence 216, comprend un élément de réception de poudre 230 formé par une plaque présentant un bossage central 231 de part et d'autre duquel s'étendent deux glissières larérales 231A. Cet élément de réception comprend également des rebords latéraux 232.FIG. 4 illustrates a third embodiment of the dispensing device according to the invention. This last, designated as a whole by the reference 216, includes a powder receiving element 230 formed by a plate having a central boss 231 on either side of which extend two lateral slides 231A. This element of reception also includes side edges 232.

Le dispositif de distribution 216 comprend également un organe de raclage désigné dans son ensemble par la référence 234. Ce dernier comprend un corps de base 235 présentant, en vue de dessus, globalement une forme de U. Ce corps de base 235 est pourvu d'ailes latérales 238 terminées par des déflecteurs 240 analogues à ceux 40 représentés en figures 1 et 2. Chaque aile 238 est munie d'un rebord inférieur 238A s'étendant en direction de l'aile opposée. Une saillie 238B est en outre prévue sur la face supérieure de chacun de ces rebords 238A. La face supérieure 235A du corps de base 235 est en outre partiellement fermée et présente, au voisinage des déflecteurs 240, un décrochement 235B en forme de U destiné au passage de la poudre.The distribution device 216 also includes a scraping device designated as a whole by the reference 234. The latter comprises a basic body 235 having, in top view, generally a U-shape. This basic body 235 is provided with side wings 238 terminated by deflectors 240 similar to those 40 shown in Figures 1 and 2. Each wing 238 is provided with a lower rim 238A extending in direction of the opposite wing. In addition, a projection 238B is provided on the upper face of each of these edges 238A. The 235A upper face of the base body 235 is also partially closed and has, in the vicinity of the deflectors 240, a 235B U-shaped recess for the passage of the powder.

Un volet 236 est monté à pivotement, autour d'un axe B passant par sa face supérieure 236A, sur les ailes 238 du corps de base 235, au niveau d'orifices 238C de celles-ci. Le volet 236 est articulé à la tige 242 d'un vérin non représenté, par l'intermédiaire d'une traverse 244 coopérant avec des chapes 245 dont est pourvu le volet 236. Ce dernier présente, au niveau de son extrémité inférieure 236B, un profil correspondant à la fois au bossage 231 et aux glissières 231A de l'élément de réception 230, de sorte qu'il est à même de coulisser sur la surface supérieure de ce dernier. Ce volet 236 constitue, comme cela sera explicité par la suite, une surface de poussée de la poudre.A flap 236 is pivotally mounted around an axis B passing through its upper face 236A, on the wings 238 of the body base 235, at orifices 238C thereof. The blind 236 is articulated to the rod 242 of a jack not shown, by through a crosspiece 244 cooperating with yokes 245 with which section 236 is provided. The latter presents, at level of its lower end 236B, a corresponding profile both at boss 231 and at slides 231A of the receiving element 230, so that it is able to slide on the upper surface of the latter. This component 236 constitutes, as will be explained below, a surface powder pushing.

Une étrave 248 est fixée au niveau de la face supérieure 235A du corps de base 235. Cette étrave comprend deux faces 248A symétriques par rapport à l'axe longitudinal de l'organe de raclage, faisant saillie à la fois en direction de l'élément de réception 230 et en direction des déflecteurs 240, c'est-à-dire, en service, en direction du bain du métal fondu.A bow 248 is fixed at the level of the upper face 235A of the basic body 235. This bow has two sides 248A symmetrical about the longitudinal axis of the organ scraping, both protruding towards the element reception 230 and in the direction of the deflectors 240, that is to say, in service, in the direction of the molten metal bath.

L'organe de raclage 234 est destiné à être recouvert par un capot supérieur 249 en forme de U dont les ailes 249A sont fixées aux rebords 232 de l'élément de réception 230. Ce capot est pourvu d'une ouverture 249B sensiblement rectangulaire, assurant le passage de la poudre depuis le dispositif d'alimentation.The scraping member 234 is intended to be covered by a U-shaped top cover 249 whose wings 249A are fixed to the edges 232 of the receiving element 230. This cover is provided with a substantially rectangular opening 249B, ensuring the passage of the powder from the supply device.

Ce dispositif d'alimentation, désigné dans son ensemble par la référence 214 comprend, de manière analogue au dispositif 14 représenté à la figure 1, un tube 220 à l'intérieur duquel est disposé une vis d'Archimède non représentée. Ce tube est fixé au capot 249 par l'intermédiaire de ferrures 221. Il est pourvu, à son extrémité opposée au moteur d'actionnement de la vis, d'une buse 226 assurant le déversement de la poudre sur l'élément de réception 230. Cette buse 226 est munie d'un diffuseur 228 constitué par un renfoncement de ses parois, qui permet de diviser le flux de poudre provenant du tube 220, selon deux écoulements distincts le long de passages 228A et 228B disposés de part et d'autre du diffuseur 228, et donc de l'axe A de déplacement de l'organe de raclage 234. Cet agencement assure une répartition homogène de la poudre au niveau de l'élément de réception 230.This supply device, designated as a whole by the reference 214 includes, analogously to the device 14 shown in Figure 1, a tube 220 inside which is arranged an Archimedes screw not shown. This tube is fixed to the cover 249 by means of fittings 221. It is provided at its end opposite to the actuation motor the screw, a nozzle 226 ensuring the pouring of the powder onto the receiving element 230. This nozzle 226 is provided with a diffuser 228 formed by a recess in its walls, which allows to divide the powder flow coming from the tube 220, according to two distinct flows along passages 228A and 228B arranged on either side of the diffuser 228, and therefore of the axis A of displacement of the scraping member 234. This arrangement ensures a uniform distribution of the powder at the receiving element 230.

De manière analogue au dispositif décrit aux figures 1 à 3, l'organe de raclage 234 est mobile entre une position rétractée représentée aux figures 5A et 6A et une position avancée représentée aux figures 5B et 6B.Analogously to the device described in Figures 1 to 3, the scraping member 234 is movable between a position retracted shown in Figures 5A and 6A and a position projection shown in Figures 5B and 6B.

Dans la position rétractée de l'organe de raclage, l'extrémité avant des ailes 238 affleure sensiblement l'extrémité avant de l'élément de réception 230. Par convention, l'extrémité avant est, en service, adjacente au bain. La poudre de laitier acheminée par la vis d'Archimède se déverse, au niveau de la buse 226, selon les passages 228A, 228B formés au sein de celle-ci. Les faces symétriques 248A de l'étrave assurent une bonne répartition de la poudre, à la fois sur la bossage central 231 et les glissières 231A de l'élément de réception, qui constituent une zone de réception 246 de la poudre.In the retracted position of the scraping member, the front end of the wings 238 is substantially flush with the end before the receiving element 230. By convention, the front end is, in use, adjacent to the bath. The powder slag conveyed by the Archimedes screw pours out, level of nozzle 226, according to passages 228A, 228B formed at within it. The symmetrical 248A faces of the bow ensure a good distribution of the powder, both on the central boss 231 and the slides 231A of the element reception, which constitute a reception area 246 of the powder.

Une fois cette dose de poudre déversée, l'organe de raclage est mis en mouvement par l'intermédiaire de la tige 242 du vérin. Comme le montre en particulier la figure 6B, étant donné que cette tige est articulée au volet 236, ce dernier est entraíné vers l'avant et vient en butée contre les saillies 238B. Il y a donc une parfaite complémentarité de formes entre la surface supérieure de l'élément de réception 230 et la surface inférieure du volet 236 lorsque l'organe de raclage est déplacé vers l'avant, de sorte que la perte de poudre est extrêmement réduite.Once this dose of powder has been spilled, the scraping is set in motion via the rod 242 of the cylinder. As shown in particular in Figure 6B, being given that this rod is articulated to the flap 236, the latter is driven forward and abuts against the projections 238B. There is therefore a perfect complementarity of forms between the upper surface of the receiving element 230 and the lower surface of the flap 236 when the scraping member is moved forward, so the powder loss is extremely reduced.

Dans la position avancée de l'organe de raclage, le volet 236 affleure sensiblement l'extrémité avant de l'élément de réception 230. Une fois la poudre éjectée, la tige 242 agit sur le volet 236 de manière à déplacer l'organe de raclage 234 vers sa position rétractée. Lors de ce,déplacement, comme le montre en particulier la figure 6A, le volet 236 a tendance à se soulever vers l'arrière, sous l'effet de la traction exercée par la tige 242, de manière à limiter les pertes de poudre résiduelle lors du retour de l'organe de raclage. Une fois ce dernier revenu dans sa position rétractée, une dose supplémentaire de poudre peut être admise au niveau de la zone de réception 246 dès que cela est souhaité par l'utilisateur, puis éjectée sous l'action de l'organe de raclage 234.In the advanced position of the scraping member, the flap 236 is substantially flush with the front end of the element reception 230. Once the powder has been ejected, the rod 242 acts on the flap 236 so as to move the scraping member 234 towards its retracted position. When moving, as shown in particular in FIG. 6A, the flap 236 tends to be lift backwards, under the effect of the traction exerted by rod 242, so as to limit the loss of powder residual during the return of the scraping member. Once this last returned to its retracted position, an additional dose powder can be admitted in the reception area 246 as soon as desired by the user, then ejected under the action of the scraping member 234.

Claims (13)

  1. Device (16; 116; 216) for distributing slag powder on the surface of a bath (10) of molten metal received in a continuous casting ingot mould (2), of the type comprising:
    a powder-receiving element (30; 130; 230) capable of being fed by a powder feed device (14; 214) and having a first end (32), close to the bath (10), which extends essentially to directly above a wall (4B) of the ingot mould (2) in contact with the bath, and is suitable for receiving a quantity of powder (48) at the level of a reception zone (46; 146; 246) that is horizontal on the whole; and
    powder distribution means (34; 134; 234) suitable for ejecting, above the surface of the bath (10), the said quantity of powder (48) in an essentially horizontal direction,
    characterised in that the distribution means comprise a raking element (34; 134; 234) that can be moved along a displacement direction between a retracted position with respect to the bath and a protruding position with respect to the bath (10), the said raking element (34; 134; 234) having a pushing surface (36; 236) suitable for ejecting the said quantity of powder during its movement between the said retracted and protruding positions.
  2. Device according to Claim 1, characterised in that the said pushing surface (236) is equipped to rise during the movement of the raking element (234) between the said protruding and retracted positions, so as to be remote from the powder-receiving zone (246).
  3. Device according to Claim 2, characterised in that the said pushing surface (236) is equipped to pivot about a horizontal axis during the movement of the raking element (234) between its protruding and retracted positions, and comes into abutment with at least one projection (238B) on the raking element (234) during its movement between its retracted and protruding positions.
  4. Device according to one of Claims 1 to 3, characterised in that it has at least one lateral retaining surface (38; 132; 238) for the powder during the movement of the raking element (34; 134; 234) between its retracted position and its protruding position.
  5. Device according to Claim 1, characterised in that the said raking element (134) is equipped with means (148; 248) for homogeneous distribution of the powder over the powder-receiving zone (146; 246).
  6. Device according to Claim 5, characterised in that the means for homogeneous distribution comprise a bow (148; 248) protruding, from the vicinity of the pushing surface (134; 236), towards the bath.
  7. Device according to one of the preceding claims, characterised in that the said raking element (34) comprises a web (36) arranged essentially perpendicularly to the direction of movement of the raking element and constituting the pushing surface, and two wings (38) extending on either side of the said web (36) towards the bath and each constituting a retaining surface.
  8. Device according to Claim 7, characterised in that each wing (38) is extended, at its distal end, by a deflector (40) projecting at one and the same time in the direction opposite to the web (36) and in the direction of the opposing wing.
  9. Device according to one of the preceding claims, characterised in that the said raking element (134) slides between two parallel shoulders (132) with which the powder-receiving element (130) is provided.
  10. Device according to one of the preceding claims, characterised in that it has a cover (249) covering, when the raking element is in the retracted position, at least the powder-receiving zone (246), the said cover being provided with at least one opening (249B) for passage of powder from the powder feed device (214).
  11. Continuous casting installation, comprising an ingot mould (2) defining a receiving volume for a bath of molten metal (10), a molten metal feed nozzle (8), feed means (14; 214) for slag powder and means (16; 116; 216) for distribution of slag powder at the surface of the bath of molten metal, characterised in that the said means for distribution of slag powder comprise at least one device according to one of Claims 1 to 10.
  12. Installation according to Claim 11, characterised in that the feed means (214) for slag powder comprise means (228) for homogeneous distribution of the quantity of powder on the receiving zone (246) of each powder distribution device (216).
  13. Installation according to Claim 12, characterised in that the said means for homogeneous distribution comprise at least one spreader (228) arranged in the flow path of the powder and widening towards the said receiving zone (246), so as to form at least two distinct powder flows, either side of the axis (A) of movement of the raking element.
EP98420190A 1997-10-15 1998-10-14 Apparatus for spreading slag powder and continuous casting installation provided with such an apparatus Expired - Lifetime EP0913217B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9713133A FR2769526B1 (en) 1997-10-15 1997-10-15 DEVICE FOR DISPENSING DAIRY POWDER AND CONTINUOUS CASTING INSTALLATION INCLUDING SUCH A DEVICE
FR9713133 1997-10-15

Publications (2)

Publication Number Publication Date
EP0913217A1 EP0913217A1 (en) 1999-05-06
EP0913217B1 true EP0913217B1 (en) 2002-05-08

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EP98420190A Expired - Lifetime EP0913217B1 (en) 1997-10-15 1998-10-14 Apparatus for spreading slag powder and continuous casting installation provided with such an apparatus

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EP (1) EP0913217B1 (en)
AT (1) ATE217223T1 (en)
DE (1) DE69805263T2 (en)
ES (1) ES2173559T3 (en)
FR (1) FR2769526B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT509547B1 (en) * 2010-03-12 2013-12-15 Siemens Vai Metals Tech Gmbh METHOD AND APPARATUS FOR APPLYING A POWDERY FABRIC TO A BATH MIRROR OF A METALLIC MELT IN A METALLURGICAL VESSEL
CN102319878A (en) * 2011-08-05 2012-01-18 包头联方高新技术有限责任公司 Billet continuous casting covering slag adding apparatus
KR20190128253A (en) * 2016-02-04 2019-11-15 닛폰세이테츠 가부시키가이샤 Method for injecting add-in material for molten metal and device for injecting add-in material for molten metal
KR102486601B1 (en) * 2021-03-30 2023-01-10 현대제철 주식회사 Apparatus for inserting powder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4116367A (en) * 1975-11-12 1978-09-26 Nippon Steel Corporation Apparatus for supplying powder to continuous casting mold
FR2393746A1 (en) * 1977-06-10 1979-01-05 Siderurgie Fse Inst Rech Automatic distributor for pulverulent substances - where powder is fed through a tubular conveyor to a distribution head over molten metal in a mould
DE2814492A1 (en) * 1978-03-31 1979-10-04 Mannesmann Ag METHOD AND DEVICE FOR THE DOSED APPLICATION OF CASTING AIDS TO THE BATHROOM SURFACE OF METAL MELT
DE3044591A1 (en) * 1978-03-31 1982-07-08 Mannesmann AG, 4000 Düsseldorf Doser for adding casting powder to continuous casting moulds - where powder is conveyed by gas through doser, and extra gas stream is used to shield doser from heat rising from mould
JPS61199560A (en) * 1985-02-28 1986-09-04 Nippon Kokan Kk <Nkk> Air sliding type mold powder supplying device

Also Published As

Publication number Publication date
ATE217223T1 (en) 2002-05-15
ES2173559T3 (en) 2002-10-16
FR2769526A1 (en) 1999-04-16
DE69805263T2 (en) 2002-11-14
FR2769526B1 (en) 1999-12-03
DE69805263D1 (en) 2002-06-13
EP0913217A1 (en) 1999-05-06

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