EP0942796B1 - Method and device for discontinuous parting off of molten mass - Google Patents

Method and device for discontinuous parting off of molten mass Download PDF

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Publication number
EP0942796B1
EP0942796B1 EP97911179A EP97911179A EP0942796B1 EP 0942796 B1 EP0942796 B1 EP 0942796B1 EP 97911179 A EP97911179 A EP 97911179A EP 97911179 A EP97911179 A EP 97911179A EP 0942796 B1 EP0942796 B1 EP 0942796B1
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EP
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Prior art keywords
passage
molten
inductor
melt
molten material
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EP97911179A
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German (de)
French (fr)
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EP0942796A1 (en
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Raimund Brückner
Daniel Grimm
Richard Ardell
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Didier Werke AG
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Didier Werke AG
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/105—Induction heating apparatus, other than furnaces, for specific applications using a susceptor
    • H05B6/108—Induction heating apparatus, other than furnaces, for specific applications using a susceptor for heating a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means
    • 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

Definitions

  • the invention relates to a method for discontinuous tapping Melting, especially of metal melts, especially of liquid Steel, or molten non-metals, from one vessel through one Pass. Furthermore, the invention relates to a device for performing of the procedure.
  • Discontinuous tapping of melts takes place, for example, at Garbage melting plants.
  • US-A 5,348,566 is a method and an apparatus for inductive Controlling the outflow of a molten metal from a vessel is described.
  • the molten metal itself couples to the electromagnetic field of a Inductor.
  • the passage of the vessel does not couple to the electromagnetic one Field.
  • the object of the invention is to provide an operationally reliable method to propose the type mentioned and a corresponding device.
  • the above object is in a method of the aforementioned Kind solved in that the melt flow in the passage of the vessel or in Flow direction behind the passage of the vessel or in the flow direction behind the Run is interrupted and solidified by cooling and that to the interruption is released again and the in progress frozen melt by radial electromagnetic energy supply in the Pass is melted again.
  • the melt flow is stopped by actuating the interruption.
  • the melt is then left to freeze in one pass. It is one secure, double closure of the vessel achieved.
  • To restart the The interruption is opened in the melt flow and the melt plug melted by radial, electromagnetic energy supply. This one too The process is reliable because the use of an oxygen lance is unnecessary.
  • the interruption can either be released first and then melted the melt frozen in the run become.
  • the reverse is preferably carried out in such a way that the melt melted in the passage and then the Interruption is released. This is possible because the melting is not through an oxygen lance from below, but through radial electromagnetic Energy is supplied. This procedure has the advantage that the Interrupting (follows page 3 of the original documents).
  • Component frozen melt is melted free before the component is moved mechanically. The component is therefore not frozen through Melt blocked.
  • the electromagnetic energy supply is preferably carried out by inductive Coupling an electromagnetic field to the solidified melt and / or to the run. If the melt is a molten metal, couples them to the electromagnetic field of an inductor. It However, the pass can also be made of an inductively coupling material consist. It then transmits through heat conduction and / or heat radiation the energy on the solidified melt.
  • the cooling and solidification of the Melt in the pass after the melt flow is interrupted by means of cooling one for the electromagnetic energy supply provided inductor supported with electrically switched off inductor.
  • the solidified or melted completely solidified melt plug so quickly that a thin Edge zone of the melt plug is liquefied before in the Melt plugs temperature compensation takes place from the outside in is.
  • the melting plug that expands when it melts the liquefied material in its peripheral zone goes up or down pushed away, so that the passage is not blown up by the expansion becomes.
  • This can also result in the danger of the run exploding Plugs of melt expand into the annular space that is released in the process can.
  • the run consists of an inductive to the be resolved that the run leading to the frozen melt is heated and expands so much that the melting material coupling the electromagnetic field of the inductor, especially ceramic, because of the high temperatures of the melts.
  • An apparatus for performing the described method is characterized in that in a melt vessel a pass, in particular a sleeve is arranged, the outlet of which by means of a mechanical, known actuator arrangement closable and can be released and that the passage of an inductor, in particular an air-cooled inductor, whose electromagnetic field is surrounded directly coupled to the melt and / or to the flow.
  • an inductor in particular an air-cooled inductor, whose electromagnetic field is surrounded directly coupled to the melt and / or to the flow.
  • the known actuator arrangement can have a plate with a hole and be a closure surface. It can also consist of a blank plate and one Perforated plate or nozzle exist.
  • ferrite cores For the electromagnetic shielding of a metallic holder with which the device is attached to the vessel, ferrite cores can be provided.
  • She shows: a partial section of a metallurgical vessel with a blind plate and interchangeable nozzle.
  • a sleeve (2) made of refractory, ceramic material.
  • the sleeve (2) forms an outlet opening (3) for the melt, the Exit opening (3) to a mechanical adjusting element arrangement (4) adjoins, with which the outlet opening (3) can be closed and released.
  • the sleeve (2) is surrounded by an inductor (5), the hollow one Cross-sectional profile of a cooling medium, in particular air, flows through is.
  • the inductor (5) extends as close as possible to the outlet opening (3).
  • Adjustment element arrangement (4) can be provided with ferrite cores (7).
  • melt flow is thus primarily interrupted. Then you leave then completely or partially freeze the melts in the sleeve (2). This can be accelerated by the fact that the inductor (5) is electrical is switched off, but its cooling circuit continues to operate, so that in the Sleeve (2) specifically creates a melt plug, which is a secondary Closure forms.
  • melt is to be tapped out of the vessel again, then the inductor (5) is switched on electrically. This creates a radial, electromagnetic energy supply, through which the melt plug in the Sleeve (2) is melted.
  • the melt plug is also in an area solidified on the blind plate (10) or the closure surface at least viscous, so that the blind plate can then be removed a slide nozzle (8) can slide away from the outlet opening (3), so that their hole gets under the outlet opening (3). So that is the melt flow released again.
  • the sleeve (2) is melting when it sits in it Melt plug itself exposed to loads that are based on that the melt plug expands radially when melting, so that there is a risk that the sleeve (2) breaks or cracks form in it.
  • This problem is avoided in the described device by that by means of the inductor (5) a thin edge zone of the jacket area of the Melt plug in the liquid or viscous state, before entering the melt plug from the outside in Temperature compensation takes place, that is over the entire cross section of the Melt plug going temperature expansion becomes effective.
  • the leading liquid or viscous edge zone of the The melt plug will expand as it continues to expand - if the outlet opening (3) is still closed - or down and from the top of the sleeve (2) through the expanding one Melt plug pushed out so that the sleeve (2) at most one exposed to low radial internal pressure.
  • the melt flow is in the flow direction interrupted by the passage formed by the sleeve (2) and by Cooling solidified in one pass. It is also possible to change the melt flow in the passage by means of a locking pin or a stopper interrupt.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Silicon Compounds (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Continuous Casting (AREA)

Abstract

The invention pertains to a process and an apparatus for the discontinuous tapping of melts. An inductor surrounds a passage through which the melt is discharged from a vessel. The inductor applies radial electromagnetic energy to the passage to maintain the melt in a molten state. To stop flow of the melt through the passage, an outlet opening of the passage is closed and the inductor is electrically switched off while a cooling medium is flowed through the inductor. To begin flow of the melt, the outlet opening of the passage is opened and the inductor is electrically switched on.

Description

Die Erfindung betrifft ein Verfahren zum diskontinuierlichen Abstechen von Schmelzen, insbesondere von Metallschmelzen, insbesondere von flüssigem Stahl, oder schmelzflüssigen Nichtmetallen, aus einem Gefäß durch einen Durchlauf. Weiterhin betrifft die Erfindung eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for discontinuous tapping Melting, especially of metal melts, especially of liquid Steel, or molten non-metals, from one vessel through one Pass. Furthermore, the invention relates to a device for performing of the procedure.

Beim diskontinuierlichen Abstechen von Schmelze wird der Schmelzenausfluß, während das Gefäß noch mehr oder weniger gefüllt ist, gezielt unterbrochen, um danach erneut gestartet zu werden. Nach dem Unterbrechen des Schmelzenflusses friert Schmelze im Durchlauf ein und bildet dort einen Pfropfen. Dieser muß vor dem erneuten Starten des Schmelzenausflusses entfernt werden. Nach dem Stand der Technik wird der Pfropfen mittels einer Sauerstofflanze ausgeschmolzen. Diese muß hierfür von unten an das Gefäß geführt werden, was ein gefährlicher Arbeitsvorgang ist.When the melt is tapped discontinuously, the Melt discharge while the vessel is still more or less full, deliberately interrupted in order to be started again afterwards. After this Interrupting the melt flow freezes melt in the pass and forms a plug there. This must be started before the Melt outflow are removed. According to the state of the art the plug was melted out using an oxygen lance. This must for this to be carried from below to the vessel, which is a dangerous Operation is.

Ein diskontinuierliches Abstechen von Schmelzen erfolgt beispielsweise bei Müll-Einschmelzanlagen. Discontinuous tapping of melts takes place, for example, at Garbage melting plants.

In der US-A 5,348,566 ist ein Verfahren und eine Vorrichtung zur induktiven Steuerung des Ausfließens einer Metallschmelze aus einem Gefäß beschrieben. Die Metallschmelze selbst koppelt an das elektromagnetische Feld eines Induktors an. Der Durchlauf des Gefäßes koppelt nicht an das elektromagnetische Feld an.In US-A 5,348,566 is a method and an apparatus for inductive Controlling the outflow of a molten metal from a vessel is described. The molten metal itself couples to the electromagnetic field of a Inductor. The passage of the vessel does not couple to the electromagnetic one Field.

Aufgabe der Erfindung ist es, ein betriebssicheres Verfahren der eingangs genannten Art und eine entsprechende Vorrichtung vorzuschlagen.The object of the invention is to provide an operationally reliable method to propose the type mentioned and a corresponding device.

Erfindungsgemäß ist obige Aufgabe bei einem Verfahren der eingangs genannten Art dadurch gelöst, daß der Schmelzenfluß im Durchlauf des Gefäßes oder in Flußrichtung hinter dem Durchlauf des Gefäßes oder in Flußrichtung hinter dem Durchlauf unterbrochen wird und durch Abkühlung verfestigt wird und daß zum erneuten Abstechen die Unterbrechung freigegeben wird und die im Durchlauf eingefrorene Schmelze durch radiale elektromagnetische Energiezufuhr in den Durchlauf wieder aufgeschmolzen wird.According to the invention the above object is in a method of the aforementioned Kind solved in that the melt flow in the passage of the vessel or in Flow direction behind the passage of the vessel or in the flow direction behind the Run is interrupted and solidified by cooling and that to the interruption is released again and the in progress frozen melt by radial electromagnetic energy supply in the Pass is melted again.

Gestoppt wird der Schmelzenfluß durch Betätigung der Unterbrechung. Anschließend läßt man die Schmelze im Durchlauf einfrieren. Es ist damit ein sicherer, doppelter Abschluß des Gefäßes erreicht. Zum erneuten Starten des Schmelzenflusses wird die Unterbrechung geöffnet und der Schmelzenpfropfen durch radiale, elektromagnetische Energiezufuhr aufgeschmolzen. Auch dieser Vorgang ist betriebssicher, weil der Einsatz einer Sauerstofflanze überflüssig ist. The melt flow is stopped by actuating the interruption. The melt is then left to freeze in one pass. It is one secure, double closure of the vessel achieved. To restart the The interruption is opened in the melt flow and the melt plug melted by radial, electromagnetic energy supply. This one too The process is reliable because the use of an oxygen lance is unnecessary.

Beim erneuten Abstechen kann entweder zuerst die Unterbrechung freigegeben werden und dann die im Durchlauf eingefrorene Schmelze aufgeschmolzen werden. Vorzugsweise wird jedoch umgekehrt derart vorgegangen, daß zuerst die im Durchlauf eingefrorene Schmelze aufgeschmolzen und danach die Unterbrechung freigegeben wird. Dies ist möglich, weil das Aufschmelzen nicht durch eine Sauerstofflanze von unten, sondern durch radiale elektromagnetische Energiezufuhr erfolgt. Diese Vorgehensweise hat den Vorteil, daß auf dem die Unterbrechung bildenden (folgt Seite 3 der ursprünglichen Unterlagen). When tapping again, the interruption can either be released first and then melted the melt frozen in the run become. However, the reverse is preferably carried out in such a way that the melt melted in the passage and then the Interruption is released. This is possible because the melting is not through an oxygen lance from below, but through radial electromagnetic Energy is supplied. This procedure has the advantage that the Interrupting (follows page 3 of the original documents).

Bauteil festgefrorene Schmelze freigeschmolzen wird, bevor das Bauteil mechanisch bewegt wird. Das Bauteil ist also nicht durch festgefrorene Schmelze blockiert.Component frozen melt is melted free before the component is moved mechanically. The component is therefore not frozen through Melt blocked.

Die elektromagnetische Energiezufuhr erfolgt vorzugsweise durch induktives Ankoppeln eines elektromagnetischen Feldes an die erstarrte Schmelze und/oder an den Durchlauf. Wenn die Schmelze eine Metallschmelze ist, koppelt sie selbst an das elektromagnetische Feld eines Induktors an. Es kann jedoch auch der Durchlauf aus einem induktiv ankoppelnden Material bestehen. Er überträgt dann durch Wärmeleitung und/oder Wärmestrahlung die Energie auf die erstarrte Schmelze.The electromagnetic energy supply is preferably carried out by inductive Coupling an electromagnetic field to the solidified melt and / or to the run. If the melt is a molten metal, couples them to the electromagnetic field of an inductor. It However, the pass can also be made of an inductively coupling material consist. It then transmits through heat conduction and / or heat radiation the energy on the solidified melt.

In Weiterbildung der Erfindung wird die Abkühlung und Verfestigung der Schmelze im Durchlauf nach der Unterbrechung des Schmelzenflusses mittels einer Kühlung eines für die elektromagnetische Energiezufuhr vorgesehenen Induktors bei elektrisch abgeschaltetem Induktor unterstützt. Dadurch wird ein den Durchlauf absperrender Schmelzenpfropfen schnell gebildet.In a development of the invention, the cooling and solidification of the Melt in the pass after the melt flow is interrupted by means of cooling one for the electromagnetic energy supply provided inductor supported with electrically switched off inductor. As a result, a melt plug that blocks the flow becomes fast educated.

Um zu vermeiden, daß der Schmelzenpfropfen beim Aufschmelzen den Durchlauf sprengen kann, erfolgt das Aufschmelzen des verfestigten oder völlig durcherstarrten Schmelzenpfropfens so schnell, daß eine dünne Randzone des Schmelzenpfropfens verflüssigt wird, bevor im Schmelzenpropfen ein Temperaturausgleich von außen nach innen erfolgt ist. Durch den sich beim Aufschmelzen ausdehnenden Schmelzenpfropfen wird das verflüssigte Material seiner Randzone nach oben oder unten weggeschoben, so daß durch die Ausdehnung der Durchlauf nicht gesprengt wird. Die Gefahr des Sprengens des Durchlaufes kann auch dadurch Schmelzenpfropfen sich in den dabei freiwerdenden Ringraum ausdehnen kann. In diesem Fall besteht der Durchlauf aus einem induktiv an das behoben werden, daß der Durchlauf voreilend zur eingefrorenen Schmelze aufgeheizt wird und sich dabei so weit aufdehnt, daß der aufschmelzende elektromagnetische Feld des Induktors ankoppelnden Material, insbesondere aus Keramik, wegen der hohen Temperaturen der Schmelzen.In order to avoid that the melt plug when melting the Can blow up, the solidified or melted completely solidified melt plug so quickly that a thin Edge zone of the melt plug is liquefied before in the Melt plugs temperature compensation takes place from the outside in is. Through the melting plug that expands when it melts the liquefied material in its peripheral zone goes up or down pushed away, so that the passage is not blown up by the expansion becomes. This can also result in the danger of the run exploding Plugs of melt expand into the annular space that is released in the process can. In this case, the run consists of an inductive to the be resolved that the run leading to the frozen melt is heated and expands so much that the melting material coupling the electromagnetic field of the inductor, especially ceramic, because of the high temperatures of the melts.

Eine Vorrichtung zur Durchführung des beschriebenen Verfahrens ist dadurch gekennzeichnet, daß in einem Schmelzengefäß ein Durchlauf, insbesondere eine Hülse, angeordnet ist, dessen Austritt mittels einer mechanischen, an sich bekannter Verstellgliedanordnung verschließbar und freigebbar ist und daß der Durchlauf von einem Induktor, insbesondere einem luftgekühlten Induktor, umgeben ist, dessen elektromagnetisches Feld direkt an die Schmelze und/oder an den Durchlauf ankoppelt. Dadurch, daß der Durchlauf selbst von dem Induktor umgeben ist, ist gewährleistet, daß der Schmelzenpfropfen von der radialen Energiezufuhr erfaßt wird.An apparatus for performing the described method is characterized in that in a melt vessel a pass, in particular a sleeve is arranged, the outlet of which by means of a mechanical, known actuator arrangement closable and can be released and that the passage of an inductor, in particular an air-cooled inductor, whose electromagnetic field is surrounded directly coupled to the melt and / or to the flow. As a result of that the passage itself is surrounded by the inductor, it is ensured that the melt plug is caught by the radial energy supply.

Die bekannte Verstellgliedanordnung kann eine Platte mit einem Loch und einer Verschlußfläche sein. Sie kann auch aus einer Blindplatte und einer Lochplatte oder Düse bestehen.The known actuator arrangement can have a plate with a hole and be a closure surface. It can also consist of a blank plate and one Perforated plate or nozzle exist.

Zur elektromagnetischen Abschirmung einer metallischen Halterung, mit der die Vorrichtung am Gefäß befestigt ist, können Ferritkerne vorgesehen sein.For the electromagnetic shielding of a metallic holder with which the device is attached to the vessel, ferrite cores can be provided.

Ein Ausführungsbeispiel ist in der einzigen Figur beschrieben. Sie zeigt:
   einen Teilschnitt eines metallurgischen Gefäßes mit einer Blindplatte und Wechseldüse. An embodiment is described in the single figure. She shows:
a partial section of a metallurgical vessel with a blind plate and interchangeable nozzle.

In den Boden (1) eines metallurgischen Gefäßes ist als Durchlauf für die Schmelze eine Hülse(2) aus feuerfestem, keramischem Material eingebaut. Die Hülse(2) bildet eine Austrittsöffnung(3) für die Schmelze, wobei die Austrittsöffnung(3) an eine mechanische Verstellgliedanordnung(4) angrenzt, mit der die Austrittsöffnung(3) verschließbar und freigebbar ist.In the bottom (1) of a metallurgical vessel is a pass for the Melt a sleeve (2) made of refractory, ceramic material. The sleeve (2) forms an outlet opening (3) for the melt, the Exit opening (3) to a mechanical adjusting element arrangement (4) adjoins, with which the outlet opening (3) can be closed and released.

Die Hülse(2) ist von einem Induktor(5) umgeben, dessen hohles Querschnittsprofil von einem Kühlmedium, insbesondere Luft, durchströmt ist. Der Induktor(5) reicht möglichst nahe an die Austrittsöffnung(3). Zur elektrischen Abschirmung gegenüber einer metallischen Halterung(6) der Verstellgliedanordnung(4) können Ferritkerne(7) vorgesehen sein.The sleeve (2) is surrounded by an inductor (5), the hollow one Cross-sectional profile of a cooling medium, in particular air, flows through is. The inductor (5) extends as close as possible to the outlet opening (3). For electrical shield against a metallic bracket (6) Adjustment element arrangement (4) can be provided with ferrite cores (7).

In der Halterung(6) ist die an sich bekannte Verstellgliedanordnung (4) verschieblich geführt. Bei der Ausführung nach Figur 1 besteht die Verstellgliedanordnung(4) aus einer Wechseldüse(8) bzw. Lochplatte und einer Blindplatte (10). Beide sind in einer Führung(9) der Halterung(6) in der Weise verschieblich, daß beim Einschieben der Blindplatte diese die Wechseldüse(8) von der Austrittsöffnung(3) wegschiebt, wonach dann die Blindplatte die Austrittsöffnung(3) versperrt und eine nachgeschobene Wechseldüse(8) die Blindplatte von der Austrittsöffnung(3) wegschiebt, wobei die Wechseldüse(8) dann unter die Austrittsöffnung(3) gelangt.In the holder (6) the known actuator arrangement (4) slidably guided. In the embodiment according to Figure 1 Adjusting element arrangement (4) from an exchangeable nozzle (8) or perforated plate and a blind plate (10). Both are in a guide (9) of the holder (6) in the Slidable that when inserting the blind plate this Exchangeable nozzle (8) pushes away from the outlet opening (3), after which the Blind plate blocked the outlet opening (3) and one pushed Exchangeable nozzle (8) pushes the blind plate away from the outlet opening (3), the interchangeable nozzle (8) then gets under the outlet opening (3).

Es ist jedoch auch jede andere an sich bekannte Unterbrechung des Schmelzenflusses denkbar, wie z.B. ein in die Hülse (2) von unten eingeführter Kupferdorn oder ein von oben eingeführter keramischer Stopfen (nicht dargestellt). However, it is also any other known interruption of the Melt flow conceivable, such as one into the sleeve (2) from below inserted copper mandrel or a ceramic plug inserted from above (not shown).

Die Funktionsweise der beschriebenen Vorrichtungen ist im wesentlichen folgende: Soll der Schmelzenfluß gestoppt werden, dann wird bei der Ausführung nach der Figur die Wechseldüse(8) mittels einer Blindplatte weggeschoben, bis die Blindplatte die Austrittsöffnung(3) sperrt oder es wird ein Dorn bzw. Stopfen eingeführt.The functioning of the devices described is essentially the following: If the melt flow is to be stopped, then the Execution according to the figure, the interchangeable nozzle (8) by means of a blind plate pushed away until the blind plate closes the outlet opening (3) or it becomes a mandrel or plug inserted.

Damit ist der Schmelzenfluß primär unterbrochen. Anschließend läßt man dann die Schmelzen in der Hülse(2) ganz oder teilweise einfrieren. Dies kann dadurch beschleunigt werden, daß der Induktor(5) elektrisch abgeschaltet wird, sein Kühlkreislauf jedoch weiter arbeitet, so daß in der Hülse(2) gezielt ein Schmelzenpfropfen entsteht, der einen sekundären Verschluß bildet.The melt flow is thus primarily interrupted. Then you leave then completely or partially freeze the melts in the sleeve (2). This can be accelerated by the fact that the inductor (5) is electrical is switched off, but its cooling circuit continues to operate, so that in the Sleeve (2) specifically creates a melt plug, which is a secondary Closure forms.

Wenn dann wieder Schmelze aus dem Gefäß abgestochen werden soll, wird der Induktor(5) elektrisch eingeschaltet. Dadurch erfolgt eine radiale, elektromagnetische Energiezufuhr, durch die der Schmelzenpfropfen in der Hülse(2) aufgeschmolzen wird. Der Schmelzenpfropfen wird dabei auch in einem an der Blindplatte (10) bzw. der Verschlußfläche erstarrten Bereich zumindest zähflüssig, so daß sich anschließend dann die Blindplatte mittels einer Wechseldüse (8) von der Austrittsöffnung (3) wegschieben läßt, so daß ihr Loch unter die Austrittsöffnung(3) gelangt. Damit ist der Schmelzenfluß wieder freigegeben.If melt is to be tapped out of the vessel again, then the inductor (5) is switched on electrically. This creates a radial, electromagnetic energy supply, through which the melt plug in the Sleeve (2) is melted. The melt plug is also in an area solidified on the blind plate (10) or the closure surface at least viscous, so that the blind plate can then be removed a slide nozzle (8) can slide away from the outlet opening (3), so that their hole gets under the outlet opening (3). So that is the melt flow released again.

Die Hülse(2) ist beim Aufschmelzen des in ihr sitzenden Schmelzenpfropfens an sich Belastungen ausgesetzt, die darauf beruhen, daß sich der Schmelzenpfropfen beim Aufschmelzen radial ausdehnt, so daß die Gefahr besteht, daß die Hülse(2) bricht oder sich in ihr Risse bilden. Dieses Problem ist bei der beschriebenen Einrichtung dadurch vermieden, daß mittels des Induktors(5) eine dünne Randzone des Mantelbereichs des Schmelzenpfropfens in den flüssigen oder zähflüssigen Zustand übergeht, bevor im Schmelzenpfropfen von außen nach innen ein Temperaturausgleich erfolgt, also die über den gesamten Querschnitt des Schmelzenpfropfens gehende Temperaturausdehnung wirksam wird. Die voreilend flüssig oder zähflüssig gewordene Randzone des Schmelzenpfropfens wird bei dessen weiterer Ausdehnung nach oben - wenn die Austrittsöffnung(3) noch geschlossen ist - oder nach unten und oben aus der Hülse(2) durch den sich weiter ausdehnenden Schmelzenpfropfen herausgedrückt, so daß die Hülse(2) höchstens einem geringen radialen Innendruck ausgesetzt ist.The sleeve (2) is melting when it sits in it Melt plug itself exposed to loads that are based on that the melt plug expands radially when melting, so that there is a risk that the sleeve (2) breaks or cracks form in it. This problem is avoided in the described device by that by means of the inductor (5) a thin edge zone of the jacket area of the Melt plug in the liquid or viscous state, before entering the melt plug from the outside in Temperature compensation takes place, that is over the entire cross section of the Melt plug going temperature expansion becomes effective. The leading liquid or viscous edge zone of the The melt plug will expand as it continues to expand - if the outlet opening (3) is still closed - or down and from the top of the sleeve (2) through the expanding one Melt plug pushed out so that the sleeve (2) at most one exposed to low radial internal pressure.

Das genannte Problem läßt sich auch dadurch umgehen, daß sich die Hülse(2) unter der Wirkung des Induktors(5) temperaturbedingt so weit aufdehnt, daß für die dann folgende Ausdehnung des Schmelzenpfropfens ein freier Ringraum besteht, in den sich der Schmelzenpfropfen ausdehnen kann. Beide Funktionen können auch sich gleichgerichtet unterstützend zusammenwirken.The problem mentioned can also be avoided by the fact that the Sleeve (2) under the action of the inductor (5) due to temperature so far expands that for the subsequent expansion of the melt plug there is a free annular space in which the melt plug extends can. Both functions can also support each other in the same direction work together.

Bei den Ausführungsbeispielen wird der Schmelzenfluß in Flußrichtung hinter dem von der Hülse(2) gebildeten Durchlauf unterbrochen und durch Abkühlung im Durchlauf verfestigt. Es ist auch möglich, den Schmelzenfluß im Durchlauf mittels eines Verschlußdornes oder eines Stopfens zu unterbrechen.In the exemplary embodiments, the melt flow is in the flow direction interrupted by the passage formed by the sleeve (2) and by Cooling solidified in one pass. It is also possible to change the melt flow in the passage by means of a locking pin or a stopper interrupt.

Claims (12)

  1. Method of discontinuously teeming molten materials, particularly molten metals, particularly liquid steel or molten non-metals, from a vessel through a passage, characterised in that the flow of molten material is interrupted in the passage of the vessel or after the passage in the flow direction and is solidified by cooling and that for further teeming the interruption is removed and the molten material solidified in the passage is re-melted by radial supply of electromagnetic energy into the passage.
  2. Method as claimed in Claim 1, characterised in that for further teeming the molten material solidified in the passage is firstly melted and thereafter the interruption is removed.
  3. Method as claimed in Claim 1 or 2, characterised in that the electromagnetic energy supply is effected by inductive coupling of an electromagnetic field with the frozen molten material and/or the passage.
  4. Method as claimed in one of the preceding claims, characterised in that the cooling and solidification of the molten material in the passage is promoted after the interruption of the flow of molten material by means of a cooler of an inductor provided for the electromagnetic energy supply, with the inductor electrically switched off.
  5. Method as claimed in one of the preceding claims, characterised in that the melting of the solidified or completely frozen plug of molten metal is effected so rapidly that an edge region of the molten material plug is liquefied before a temperature balance from the exterior to the interior takes place in the plug of molten material.
  6. Method as claimed in one of the preceding claims, characterised in that the passage is heated prior to the plug of molten material and expands to such an extent that the melting plug of molten material can expand into the annular space which is thus made available.
  7. Apparatus for carrying out the method of discontinuously teeming molten materials, particularly molten metals, particularly liquid steel or molten non-metals, from a vessel through a passage, characterised in that arranged in the passage in the vessel there is, in particular, a sleeve (2), the outlet (3) of which may be closed and opened by means of a mechanical control element arrangement (4) known per se and that the passage is surrounded by an inductor (5), particularly an air-cooled inductor, the electromagnetic field of which couples with the passage.
  8. Apparatus as claimed in Claim 7, characterised in that the passage comprises a refractory, inductively couplable ceramic material.
  9. Apparatus as claimed in Claim 7, characterised in that the control element arrangement known per se is a plate with a hole and a sealing surface.
  10. Apparatus as claimed in Claim 7, characterised in that the control element arrangement (4) known per se comprises a blind plate (10) and an apertured plate or alternating nozzle (8).
  11. Apparatus as claimed in one of the preceding claims, characterised in that a metallic mounting (6) of the apparatus on the vessel is shielded from the electromagnetic field, particularly by means of ferrite cores (7), in a manner known per se.
  12. Apparatus as claimed in one of the preceding claims, characterised in that the inductor (5) extends as close as possible to the outlet (3).
EP97911179A 1996-10-08 1997-10-06 Method and device for discontinuous parting off of molten mass Revoked EP0942796B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19641169A DE19641169C1 (en) 1996-10-08 1996-10-08 Method and device for the continuous tapping of melts
DE19641169 1996-10-08
PCT/EP1997/005469 WO1998015374A1 (en) 1996-10-08 1997-10-06 Method and device for discontinuous parting off of molten mass

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EP0942796A1 EP0942796A1 (en) 1999-09-22
EP0942796B1 true EP0942796B1 (en) 2000-05-10

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EP97911179A Revoked EP0942796B1 (en) 1996-10-08 1997-10-06 Method and device for discontinuous parting off of molten mass

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US (1) US6210629B1 (en)
EP (1) EP0942796B1 (en)
JP (1) JP2001501539A (en)
KR (1) KR20000048580A (en)
AT (1) ATE192681T1 (en)
AU (1) AU4865297A (en)
DE (2) DE19641169C1 (en)
ES (1) ES2148947T3 (en)
WO (1) WO1998015374A1 (en)

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US11141779B2 (en) 2016-11-29 2021-10-12 Refractory Intellectual Property Gmbh & Co. Kg Method and device for detecting variables in the outlet of a metallurgical vessel

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CN108290211B (en) * 2015-12-01 2021-07-06 里弗雷克特里知识产权两合公司 Sliding closure on spout of metallurgical vessel
US11141779B2 (en) 2016-11-29 2021-10-12 Refractory Intellectual Property Gmbh & Co. Kg Method and device for detecting variables in the outlet of a metallurgical vessel

Also Published As

Publication number Publication date
KR20000048580A (en) 2000-07-25
US6210629B1 (en) 2001-04-03
JP2001501539A (en) 2001-02-06
ATE192681T1 (en) 2000-05-15
AU4865297A (en) 1998-05-05
DE19641169C1 (en) 1998-05-28
DE59701674D1 (en) 2000-06-15
EP0942796A1 (en) 1999-09-22
WO1998015374A1 (en) 1998-04-16
ES2148947T3 (en) 2000-10-16

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