EP0320575A2 - Method for keeping open the flow conduit of slide gate nozzles in continuous casting plants - Google Patents

Method for keeping open the flow conduit of slide gate nozzles in continuous casting plants Download PDF

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Publication number
EP0320575A2
EP0320575A2 EP88114741A EP88114741A EP0320575A2 EP 0320575 A2 EP0320575 A2 EP 0320575A2 EP 88114741 A EP88114741 A EP 88114741A EP 88114741 A EP88114741 A EP 88114741A EP 0320575 A2 EP0320575 A2 EP 0320575A2
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EP
European Patent Office
Prior art keywords
slide plate
slide
opening stroke
throttle position
throttle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88114741A
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German (de)
French (fr)
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EP0320575A3 (en
EP0320575B1 (en
Inventor
Walter Vetterli
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Metacon AG
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Metacon AG
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Publication date
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Priority to AT88114741T priority Critical patent/ATE89772T1/en
Publication of EP0320575A2 publication Critical patent/EP0320575A2/en
Publication of EP0320575A3 publication Critical patent/EP0320575A3/en
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Publication of EP0320575B1 publication Critical patent/EP0320575B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • 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
    • B22D11/16—Controlling or regulating processes or operations

Definitions

  • the invention relates to a method for keeping the melt flow channel free in the controlled pouring, in particular of steel melt, from an intermediate vessel via a slide closure into a continuous casting mold, in which a controlled target fill level is set by regulating movements of the slide closure, which widening in the event of deposits in the flow channel Throttle position is maintained.
  • the object of the present invention is to eliminate the constricting deposits in the flow channel of the slide closure with simple measures which take place in the area of the desired fill level control with the strand quality remaining the same.
  • the object is achieved according to the invention essentially in that the slide plate is moved from a throttle position to a new throttle position in a rapid opening stroke with a speed that is matched to the regulation of the desired fill level with regard to the amount of additional melt.
  • the slide plate When carrying out the opening stroke, it has proven to be particularly expedient that the slide plate is brought from a throttle position into a throttle position opposite the flow passage of the slide closure.
  • a flow pressure that has an errosive effect on the deposits, which favors the washing out of the flow channel arises on the slide plate as a result of the mirror-image changing deflection flow of the melt.
  • uniform wear of the plate material at the throttle edges of the melt flow channel can be achieved, which in turn increases the service life of the plates. With different wear patterns in the opposite throttle positions result in different positions of the slide plate with the same flow rate.
  • the coordination of the speed of the opening stroke of the slide plate to the regulation of the nominal level is the function of two factors: on the one hand, the pouring impulse generated by a persistent, full opening of the slide plate should be able to wash out existing deposits, possibly carry them away, and on the other hand, to carry them away with the Do not raise the melt quantity conveyed by the impulse to raise the bath level in the mold beyond the control range of the nominal level.
  • the operating conditions, in particular of the melt to be cast are carried out according to the invention in such a way that the slide plate is opened periodically, namely at predetermined regular time intervals which are adapted to the lubrication behavior of the melt and, for example, when casting conventional melt, depending on the mold cross section, between one and ten minutes can be measured.
  • the opening stroke of the slide plate can take place in a set maximum degree of opening within the target level control. In this case, the initiation of the opening stroke is solely linked to the degree of narrowing of the melt flow channel.
  • the method according to the invention provides that in the throttle positions, at least before the opening stroke, the throttle movements of the slide plate are superimposed by an oscillation. This makes it easier to clear the flow channel of the slide closure. It is further proposed that purge gas is introduced into the spout (inlet sleeve) and / or the pouring tube at least during the opening stroke, which makes the flow impulse in the melt flow caused by the opening stroke more effective, especially with regard to washing out deposits in the pouring spout and pouring tube.
  • 1 means an intermediate vessel containing metallic melt, which has a slide closure 3 in the throttle position on the spout 2. This regulates the flow rate of the flow channel 7 flowing from the vessel 1 through the common flow channel 7 formed by the flow openings of the stationary top plate 4, the adjustable slide plate 5 and the in turn stationary bottom plate 6, and through the pouring tube 8 to the mold 9.
  • the slide plate 5 is mechanically coupled to an actuator 10, the respective operating position of which is identified by a position meter 11.
  • the mold 9, into which the pouring tube 8 projects with the free end, has a nominal fill level 12 which is set for normal operation and which is controlled by a transmitter (radiator) 13 and a measured value receiver 14.
  • the withdrawal of the strand 15 solidified on the outside in the mold 9 takes place by means of a take-off drive 17 having drive rollers 16, to which a controller 18 and a take-off speed meter 19 coupled with this are assigned.
  • the latter also gives its data to a processor 20, which also receives and processes the data from the position meter 11 and the measured value receiver 14. Resulting control commands are sent by a controller 21 integrated in the processor 20 to the actuator 10 of the slide closure 3 and to the trigger controller 18.
  • the withdrawal speed of the strand is defined as a constant, which means that the desired fill level 12 in the mold 9 is regulated solely from the inflow side by means of the slide closure 3.
  • the slide plate 5 assumes a throttle position which, by opening and closing, allows more or less melt to be supplied in order to maintain the balance between the amount of melt flowing in per unit time and the strand 15 emerging from the mold 9.
  • the melt flow is redirected twice when the slide closure 3 is throttled, namely on the inlet and outlet side of the slide plate 5.
  • the slide plate 5 continues to close in the event of erosion wear and an increasing cross section of the flow channel 7, and on the other hand continues to open as soon as the cross section is narrowed by deposits 22.
  • Such cross-sectional constrictions in particular result in considerable casting problems, since the opening of the slide closure 3 ends when the full degree of opening is reached, that is to say in the case of plates 4 to 6 which are congruent. so that the quantity of melt required by the control 13, 14 of the desired fill level 12 per unit of time can no longer be produced via the narrowed flow channel 7.
  • the processor 20 initiates a process sequence which automatically adjusts the slide plate 5 from the in Figure 2 with deposits 22 throttle position brought into a new, opposite throttle position (Figure 3), in which the control of the target level 12 continues.
  • the slide plate 5 adjusted in this way passes with its throughflow opening the full opening position in which the throughflow openings of all three plates 4 to 6 are coaxial, so that the fully effective pouring stream rinses away the deposits 22 which are freely suspended in the throughflow channel 7 (FIG. 4) or washes away during the , deflection of the pouring jet which changes in mirror image when entering the new throttle position.
  • the opening stroke of the slide plate 5 into the new throttle position according to FIG. 3, which is carried out in one go, without stopping, takes place at a speed which ensures that the short-term increased melt supply into the mold 9 can be easily compensated for by the desired fill level control.
  • the slide plate actuator 10 and its position meter 11 are designed for both throttle positions. Nevertheless, there is also the possibility of coping with an opening stroke with throttle operation that only works on one side, by opening the slide plate 5 without stopping and immediately returning it to an initially assumed throttle position.
  • the opening stroke can be repeated at regular intervals or it comes into play when the position meter 11 reports a defined maximum degree of opening of the slide closure 3, that is to say considerable deposits 22 are already present in the flow channel 7.
  • known flushing gas feeds can be provided on the spout (2) and on the pouring tube (8).
  • the control movements of the slide plate (5) are temporarily superimposed by an oscillation which is also known per se.
  • the invention applies to both two and three-plate gate valves on rotary, swivel or linear systems. Furthermore, the invention applies to continuous casting plants with a combined inflow and outflow control and for slide closures which are arranged on pans with which the intermediate vessel is filled depending on the bath level in the vessel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)

Abstract

In order to achieve improved strand quality, the flow conduit for the melt is kept free of deposits at the throttling edges of the slide gate nozzle by an opening stroke of the slide plate, performed in coordination with the automatic control of the setpoint filling level, out of the throttling position into a new throttling position. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Freihalten des Schmelzen-Durchflusskanals beim geregelten Vergiessen insbe­sondere von Stahlschmelze aus einem Zwischengefäss über einen Schieber- verschluss in eine Stranggiesskokille, in der ein kontrollierter Sollfüllstand durch Regelbewegungen des Schieber­verschlusses eingestellt wird, welcher in einer bei Ablagerungen im Durchflusskanal sich erweiternden Drosselstellung gehalten wird.The invention relates to a method for keeping the melt flow channel free in the controlled pouring, in particular of steel melt, from an intermediate vessel via a slide closure into a continuous casting mold, in which a controlled target fill level is set by regulating movements of the slide closure, which widening in the event of deposits in the flow channel Throttle position is maintained.

Aus der DE-PS 34 22 901 ist es bekannt, den Durchflusskanal von Schieberverschlüssen an Zwischengefässen von Stranggiessanlagen von Ablagerungen zu befreien, durch ein einleitendes Schliessen des Schieberverschlusses zur Absenkung des Badspiegels in der Kokille und damit zur Schaffung eines Freiraumes, der nach voller Oeffnung des Verschlusses eine Ablagerungen wegspülende Giesswelle aufnimmt.From DE-PS 34 22 901 it is known to free the flow channel from slide closures on intermediate vessels of continuous casting plants from deposits by an initial closing of the slide closure to lower the bath level in the mold and thus to create a free space which, after the full opening of the Closure picks up a pouring wave washing away deposits.

Ein derartiges Vorgehen verleitet nich selten dazu, das Freimachen des Schmelzen-Durchflusskanals im Schieberverschluss mit grösseren Zeitabständen vorzunehmen, worunter dann oftmals die Strangqualität leidet. Vor allem können die Niveauunter­schiede beim Absenken des Badspiegels in der Kokille immer wieder die Ursache von Oberflächenfehlern am gegossenen Strang sein.Such a procedure often leads to the fact that the melt flow channel in the slide valve closure is cleared at longer intervals, which often affects the strand quality. Above all, the level differences when lowering the bath level in the mold can always be the cause of surface defects on the cast strand.

Aufgabe vorliegender Erfindung ist es, die verengenden Ab­lagerungen im Durchflusskanal des Schieberverschlusses mit einfachen, im Bereich der Sollfüllstandsregelung vor sich gehenden Massnahmen bei gleichbleibender Strangqualität zu beseitigen.The object of the present invention is to eliminate the constricting deposits in the flow channel of the slide closure with simple measures which take place in the area of the desired fill level control with the strand quality remaining the same.

Die gestellte Aufgabe wird gemäss der Erfindung im wesentlichen dadurch gelöst, dass die Schieberplatte in einem zügig durchge­führten Oeffnungshub mit einer bezüglich des Anfalls zusätzlicher Schmelzenmenge auf die Regelung des Sollfüllstandes abgestimmten Geschwindigkeit aus einer Drosselstellung heraus in eine neue Drosselstellung gestellt wird.The object is achieved according to the invention essentially in that the slide plate is moved from a throttle position to a new throttle position in a rapid opening stroke with a speed that is matched to the regulation of the desired fill level with regard to the amount of additional melt.

Auf diese Weise wird ein effektives Freispülen bzw. Auswaschen des Schmelzen-Durchflusskanals im Schieberverschluss innerhalb der Sollfüllstandsregelung erzielt. Das bedeutet, dass der Soll­füllstand in der Kokille innerhalb zulässiger Grenzen schwankt und nachteilige Unterschiede der Badspiegelhöhe in der Kokille nich vorkommen. Damit sind die Voraussetzungen für eine gute Strangqualität erfüllt.In this way, an effective flushing or washing out of the melt flow channel in the slide valve closure is achieved within the target level control. This means that the target level in the mold fluctuates within permissible limits and there are no disadvantageous differences in the bath level in the mold. This fulfills the requirements for good strand quality.

Bei der Durchführung des Oeffnungshubes hat sich als besonders zweckdienlich erwiesen, dass die Schieberplatte von einer Drosselstellung in eine am Durchflusskanal des Schieberver­verschlusses gegenüberliegende Drosselstellung gebracht wird. Dadurch entsteht zusätzlich zu dem mit dem Oeffnungshub erzeugten Giessimpuls infolge des sich spiegelbildlich verändernden Um­lenkungsflusses der Schmelze an der Schieberplatte ein speziell auf die Ablagerungen errosiv wirkender Strömungsdruck, welcher die Auswaschung des Durchflusskanals begünstigt. Ausserdem ist ein gleichmässiger Verschleiss des Plattenmaterials an den Drosselkanten des Schmelzen-Durchflusskanals erreichbar, was wiederum die Lebensdauer der Platten erhöht. Bei unterschied­lichen Verschleissbildern in den gegenüberliegenden Drossel­ stellungen ergeben sich unterschiedliche Positionen der Schieber­platte bei gleicher Durchflussmenge. Die Abstimmung der Ge­schwindigkeit des Oeffnungshubes der Schieberplatte auf die Regelung des Sollfüllstandes ist die Funktion von zwei Faktoren: zum einen soll der mit einem verharrensfreien vollen Oeffnen der Schieberplatte erzeugte Giessimpuls imstande sein, vorhandene Ablagerungen auszuwaschen, ggf. mitzureissen, zum anderen aber die mit dem Impuls geförderte Schmelzenmenge den Badspiegel in der Kokille nicht über den Regelbereich des Sollfüllstandes hinaus anheben.When carrying out the opening stroke, it has proven to be particularly expedient that the slide plate is brought from a throttle position into a throttle position opposite the flow passage of the slide closure. As a result, in addition to the pouring impulse generated with the opening stroke, a flow pressure that has an errosive effect on the deposits, which favors the washing out of the flow channel, arises on the slide plate as a result of the mirror-image changing deflection flow of the melt. In addition, uniform wear of the plate material at the throttle edges of the melt flow channel can be achieved, which in turn increases the service life of the plates. With different wear patterns in the opposite throttle positions result in different positions of the slide plate with the same flow rate. The coordination of the speed of the opening stroke of the slide plate to the regulation of the nominal level is the function of two factors: on the one hand, the pouring impulse generated by a persistent, full opening of the slide plate should be able to wash out existing deposits, possibly carry them away, and on the other hand, to carry them away with the Do not raise the melt quantity conveyed by the impulse to raise the bath level in the mold beyond the control range of the nominal level.

Je nacht Art Der Betriebsbedingungen insbesondere der zu ver­giessenden Schmelze wird erfindungsgemäss so vorgegangen, dass das Oeffnen der Schieberplatte periodisch erfolgt, nämlich in vorgegebenen regelmässigen Zeitabständen, die dem Schmierver­verhalten der Schmelze angepasst sind und beispielsweise beim Vergiessen üblicher Schmelze je nach Kokillenquerschnitt zwischen einer und zehn Minuten bemessen sein können. Alternativ dazu kann der Oeffnungshub der Schieberplatte in einem eingestellten maximalen Oeffnungsgrad innerhalb der Sollfüllstandsregelung geschehen. In diesem Fall ist die Einleitung des Oeffnungshubes allein an den Verengungsgrad des Schmelzen-Durchflusskanals gebunden.Depending on the type of operation, the operating conditions, in particular of the melt to be cast, are carried out according to the invention in such a way that the slide plate is opened periodically, namely at predetermined regular time intervals which are adapted to the lubrication behavior of the melt and, for example, when casting conventional melt, depending on the mold cross section, between one and ten minutes can be measured. As an alternative to this, the opening stroke of the slide plate can take place in a set maximum degree of opening within the target level control. In this case, the initiation of the opening stroke is solely linked to the degree of narrowing of the melt flow channel.

Ferner sieht das erfindungsgemässe Verfahren vor, dass in den Drosselstellungen wenigstens vor dem Oeffnungshub die Drosselbewegungen der Schieberplatte durch eine Oszillation überlagert sind. Dadurch wird das Freimachen des Durchfluss­kanals des Schieberverschlusses erleichtert. Des weiteren wird vorgeschlagen, dass wenigstens während des Oeffnungshubes Spülgas in den Ausguss (Einlaufhülse) und/oder das Giessrohr eingeführt wird, was den durch den Oeffnungshub herbeige­führten Strömungsimpuls im Schmelzefluss wirksamer macht, vor allem bezüglich des Auswaschens von Ablagerungen im Aus­guss und Giessrohr.Furthermore, the method according to the invention provides that in the throttle positions, at least before the opening stroke, the throttle movements of the slide plate are superimposed by an oscillation. This makes it easier to clear the flow channel of the slide closure. It is further proposed that purge gas is introduced into the spout (inlet sleeve) and / or the pouring tube at least during the opening stroke, which makes the flow impulse in the melt flow caused by the opening stroke more effective, especially with regard to washing out deposits in the pouring spout and pouring tube.

Die Erfindung ist nachstehend an einem Ausführungsbeispiel anhand der Zeichung erläutert.

  • Figur 1 zeigt eine schematisch dargestellte, mit einem Schieberverschluss ausgerüstete Stranggiess­anlage zusammen mit einem prinzipiellen Schaltsystem, während die
  • Figuren 2 bis 4 Stellungen des Schieberverschlusses in grösserem Massstab veranschlaulichen.
The invention is explained below using an exemplary embodiment with reference to the drawing.
  • Figure 1 shows a schematically illustrated, equipped with a slide closure continuous casting system together with a basic switching system, while the
  • Figures 2 to 4 positions of the slide closure on a larger scale.

In Figure 1 bedeutet 1 ein metallische Schmelze enthaltendes Zwischengefäss, das am Ausguss 2 einen in Drosselstellung sich befindlichen Schieberverschluss 3 aufweist. Dieser regelt die Durchflussmenge der vom Gefäss 1 durch den gemeinsamen, aus den Durchflussöffnungen der ortsfesten Oberplatte 4, der verstellbaren Schieberplatte 5 und der wiederum ortsfesten Unterplatte 6 gebildeten Durchflusskanal 7 sowie durch das Giessrohr 8 zur Kokille 9 strömenden Schmelze. Zur Regelung der Durchflussmenge ist die Schieberplatte 5 mit einem Stellglied 10 mechanisch gekuppelt, dessen jeweilige Betriebposition ein Stellungsmesser 11 identifiziert.In Figure 1, 1 means an intermediate vessel containing metallic melt, which has a slide closure 3 in the throttle position on the spout 2. This regulates the flow rate of the flow channel 7 flowing from the vessel 1 through the common flow channel 7 formed by the flow openings of the stationary top plate 4, the adjustable slide plate 5 and the in turn stationary bottom plate 6, and through the pouring tube 8 to the mold 9. To regulate the flow rate, the slide plate 5 is mechanically coupled to an actuator 10, the respective operating position of which is identified by a position meter 11.

Die Kokille 9, in die das Giessrohr 8 mit dem freien Ende hineinragt, hat einen für den normalen Betrieb eingestellten Sollfüllstand 12, der von einem Sender (Strahler) 13 und einem Messwertempfänger 14 kontrolliert wird. Der Abzug des in der Kokille 9 aussen verfestigten Stranges 15 erfolgt mittels eines Treibrollen 16 aufweisenden Abzugantriebes 17, dem ein Regler 18 und ein mit diesem regeltechnisch gekuppelter Abzuggeschwindigkeitsmesser 19 zugeordnet sind. Letzterer gibt seine Daten zusätzlich an einen Prozessor 20, der ausserdem die Daten des Stellungsmessers 11 und des Messwertempfängers 14 empfängt und verarbeitet. Sich ergebende Steuerbefehle sendet eine im Prozessor 20 integrierte Steuerung 21 an das Stellglied 10 des Schieberverschlusses 3 und an den Abzugsregler 18.The mold 9, into which the pouring tube 8 projects with the free end, has a nominal fill level 12 which is set for normal operation and which is controlled by a transmitter (radiator) 13 and a measured value receiver 14. The withdrawal of the strand 15 solidified on the outside in the mold 9 takes place by means of a take-off drive 17 having drive rollers 16, to which a controller 18 and a take-off speed meter 19 coupled with this are assigned. The latter also gives its data to a processor 20, which also receives and processes the data from the position meter 11 and the measured value receiver 14. Resulting control commands are sent by a controller 21 integrated in the processor 20 to the actuator 10 of the slide closure 3 and to the trigger controller 18.

Beim Ausführungsbeispiel ist die Abzugsgeschwindigkeit des Stranges als konstante festgelegt, was bedeutet, dass der Sollfüllstand 12 in der Kokille 9 allein von der Zuflussseite her mittels des Schieberverschlusses 3 geregelt wird. Dazu nimmt die Schieberplatte 5 eine Drosselstellung ein, die es durch Auf- und Zusteuern erlaubt, mehr oder weniger Schmelze zuzuführen, um das Gleichgewicht zwischen der pro Zeiteinheit zufliessenden Schmelzenmenge und dem aus der Kokille 9 aus­tretenden Strang 15 einzuhalten.In the exemplary embodiment, the withdrawal speed of the strand is defined as a constant, which means that the desired fill level 12 in the mold 9 is regulated solely from the inflow side by means of the slide closure 3. For this purpose, the slide plate 5 assumes a throttle position which, by opening and closing, allows more or less melt to be supplied in order to maintain the balance between the amount of melt flowing in per unit time and the strand 15 emerging from the mold 9.

Der Schmelzenstrom wird, wie insbesondere aus Figur 1 er­sichtlich, bei gedrosseltem Schieberverschluss 3 zweimal umgelenkt, und zwar ein- und auslaufseitig der Schieberplatte 5. Dort besteht erhöhte Erosionsgefahr für das Feuerfeste Plattenmaterial und ausserdem treten an den besagten Stellen bevorzugt Ablagerungen von Oxyden und/oder Sulfiden auf. Einerseits fährt die Schieberplatte 5 bei Erosionsverschleiss und grösser werdendem Querschnitt des Durchflusskanals 7 weiter zu, andererseits weiter auf, sobald der Querschnitt durch Ablage­rungen 22 verengt wird. Speziell solche Querschnittsverengungen ergeben erheblich Giessprobleme, da das Auffahren des Schieber­verschlusses 3 beim Erreichen des vollen Oeffnungsgrades, also bei deckungsgleichen Platten 4 bis 6 beendet ist. so dass die von der Kontrolle 13, 14 des Sollfüllstandes 12 pro Zeiteinheit ge­forderte Schmelzenmenge über den verengten Durchflusskanal 7 nich mehr erbracht werden kann.The melt flow, as can be seen particularly in FIG. 1, is redirected twice when the slide closure 3 is throttled, namely on the inlet and outlet side of the slide plate 5. There is an increased risk of erosion for the refractory plate material and, in addition, deposits of oxides and / or occur at said points Sulfides on. On the one hand, the slide plate 5 continues to close in the event of erosion wear and an increasing cross section of the flow channel 7, and on the other hand continues to open as soon as the cross section is narrowed by deposits 22. Such cross-sectional constrictions in particular result in considerable casting problems, since the opening of the slide closure 3 ends when the full degree of opening is reached, that is to say in the case of plates 4 to 6 which are congruent. so that the quantity of melt required by the control 13, 14 of the desired fill level 12 per unit of time can no longer be produced via the narrowed flow channel 7.

Zwecks Vermeidung solcher, den Giessbetrieb erheblich stör­anfällig machenden Ablagerungen 22, welche mesit über den vorstehenden Kanten des Durchflusskanals 7 beginnen und den Schieberverschluss 3 zu immer weiterem Oeffnen zwingen, wird vom Prozessor 20 ein Verfahrensablauf eingeleitet, der ein auto­matisches Verstellen der Schieberplatte 5 von der in Figur 2 mit Ablagerungen 22 dargestellten Drosselstellung in eine neue, gegenüberliegende Drosselstellung (Figur 3) bewirkt, in der die Regelung des Sollfüllstandes 12 kontinuierlich weitergeht.In order to avoid such deposits 22, which make the casting operation considerably susceptible to faults, which begin with the protruding edges of the flow channel 7 and force the slide closure 3 to open ever further, the processor 20 initiates a process sequence which automatically adjusts the slide plate 5 from the in Figure 2 with deposits 22 throttle position brought into a new, opposite throttle position (Figure 3), in which the control of the target level 12 continues.

Die dermassen verstellte Schieberplatte 5 überfährt mit ihrer Durchflussöffnung die volle Oeffnungsposition, in der die Durchflussöffnungen aller drei Platten 4 bis 6 koaxial stehen, so dass der voll wirksame Giessstrom die frei im Durchflusskanal 7 hängenden Ablagerungen 22 wegspült (Figur 4) oder wegwäscht, während der, beim Einfahren in die neue Drosselstellung sich spiegelbildlich ändernden Umlenkung des Giessstrahls. Der in einem Zug, verharrensfrei durchgeführte Oeffnungshub der Schieberplatte 5 in die neue Drosselstellung nach Figur 3 geschieht mit einer Geschwindigkeit, welche gewährleistet, dass die kurzfristig erhöhte Schmelzezufuhr in die Kokille 9 von der Sollfüllstandsregelung ohne weiteres kompensiert werden kann.The slide plate 5 adjusted in this way passes with its throughflow opening the full opening position in which the throughflow openings of all three plates 4 to 6 are coaxial, so that the fully effective pouring stream rinses away the deposits 22 which are freely suspended in the throughflow channel 7 (FIG. 4) or washes away during the , deflection of the pouring jet which changes in mirror image when entering the new throttle position. The opening stroke of the slide plate 5 into the new throttle position according to FIG. 3, which is carried out in one go, without stopping, takes place at a speed which ensures that the short-term increased melt supply into the mold 9 can be easily compensated for by the desired fill level control.

Zur Durchführung des Oeffnungshubes, während welchem die Drosselkante der Schieberplatte 5 auf die gegenüberliegende Kante des Durchflusskanals 7 wechselt, sind das Schieberplatten­stellglied 10 und dessen Stellungsmesser 11 für beide Drossel­positionen ausgebildet. Dennoch besteht auch die Möglichkeit, einen Oeffnungshub mit nur einseitig funktionierendem Drossel­betrieb zu bewältigen, indem die Schieberplatte 5 verharrensfrei geöffnet und sofort wieder in eine ausgangs eingenommene Drosselstellung zurückgebracht wird.In order to carry out the opening stroke during which the throttle edge of the slide plate 5 changes to the opposite edge of the flow channel 7, the slide plate actuator 10 and its position meter 11 are designed for both throttle positions. Nevertheless, there is also the possibility of coping with an opening stroke with throttle operation that only works on one side, by opening the slide plate 5 without stopping and immediately returning it to an initially assumed throttle position.

Der Oeffnungshub lässt sich, um einem Zuschmieren des Durchfluss­kanals 7 vorzubeugen, in regelmässigen Abständen wiederholen oder er kommt dann zum Zuge, wenn der Stellungsmesser 11 einen fest­gelegten maximalen Oeffnungsgrad des Schieberverschlusses 3 meldet, das heisst im Durchflusskanal 7 bereits erhebliche Ab­lagerungen 22 vorhanden sind. In jedem Fall können zur Unter­stützung des durch den Oeffnungshub erzeugten Auswascheffektes am Ausguss (2) und am Giessrohr (8) an sich bekannte Spülgas­zuführungen vorgesehen sein. Ausserdem lassen sie zur Ver­stärkung des besagten Effektes die Regelbewegungen der Schieber­platte (5) zeitweise durch eine ebenfalls an sich bekannte Oszil­lation überlagern.In order to prevent the flow channel 7 from becoming smeared, the opening stroke can be repeated at regular intervals or it comes into play when the position meter 11 reports a defined maximum degree of opening of the slide closure 3, that is to say considerable deposits 22 are already present in the flow channel 7. In any case, in order to support the washout effect produced by the opening stroke, known flushing gas feeds can be provided on the spout (2) and on the pouring tube (8). In addition, in order to reinforce the above-mentioned effect, the control movements of the slide plate (5) are temporarily superimposed by an oscillation which is also known per se.

Die Erfindung gilt sowohl für Zwei- als auch Drei-Plattenschieber an Dreh- Schwenk- oder Linearsystemen. Weiterhin gilt die Er­findung für Stranggiessanlagen mit kombinierter Zufluss- und Abzugsregelung sowie für Schieberverschlüsse, die an Pfannen angeordnet sind, mit denen das Zwischengefäss in Abhängigkeit vom Badspiegel im Gefäss gefüllt wird.The invention applies to both two and three-plate gate valves on rotary, swivel or linear systems. Furthermore, the invention applies to continuous casting plants with a combined inflow and outflow control and for slide closures which are arranged on pans with which the intermediate vessel is filled depending on the bath level in the vessel.

Claims (6)

1. Verfahren zum Freihalten des Schmelzen-Durchflußkanals beim geregelten Vergießen insbesondere von Stahlschmelze aus einem Zwischengefäß über einen Schieberverschluß in eine Stranggieß­kokille, unter Einhalten eines kontrollierten Sollfüllstandes mittels des in einer Drosselstellung wirkenden Schieberver­schlusses, dessen Durchflußkanal mit Hilfe eines Öffnungsvor­ganges freigespült wird, dadurch gekennzeichnet, daß die Schieberplatte (5) in einem zügig durchgeführten Öffnungshub mit einer bezüglich des Anfalls zusätzlicher Schmelzenmenge auf die Regelung (10,11,13,14,20,21) des Sollfüllstandes (12) abge­stimmten Geschwindigkeit aus einer Drosselstellung heraus weider in eine Drosselstellung gestellt wird.1. A method for keeping the melt flow channel free in the controlled pouring, in particular of steel melt, from an intermediate vessel via a slide closure into a continuous casting mold, while maintaining a controlled target fill level by means of the slide closure acting in a throttle position, the flow channel of which is flushed out with the aid of an opening process, characterized in that that the slide plate (5) in a speedily performed opening stroke with an additional amount of melt to the control (10, 11, 13, 14, 20, 21) of the desired fill level (12) is adjusted from a throttle position to a throttle position becomes. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß mit dem Öffnungshub die Schieberplatte (5) von einer Drossel­stellung in eine am Durchflußkanal (7) des Schieberverschlusses (3) gegenüberliegende Drosselstellung gebracht wird.2. The method according to claim 1, characterized in that with the opening stroke, the slide plate (5) is brought from a throttle position in a flow channel (7) of the slide closure (3) opposite throttle position. 3) Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, dass der Oeffnungshub der Schieberplatte (5) periodisch erfolgt.3) Method according to claim 1 and 2, characterized in that the opening stroke of the slide plate (5) takes place periodically. 4) Verfahren nach Anspruch 1 und 2, dadurch gekennzeichnet, dass der Oeffnungshub beim Erreichen eines für die Drosselstellung eingestellten max. Drosselöffnungsgrades der Schieberplatte (5) beginnt.4) Method according to claim 1 and 2, characterized in that the opening stroke when reaching a set for the throttle position max. Throttle opening degree of the slide plate (5) begins. 5) Verfahren nach den Ansprüchen 1 und 2, dadurch gekenn­zeichnet, dass in den Drosselstellungen wenigstens vor dem Oeffnungshub die Drosselbewegungen der Schieberplatte (5) durch eine Oszillation überlagert sind.5) Method according to claims 1 and 2, characterized in that in the throttle positions at least before the opening stroke, the throttle movements of the slide plate (5) are superimposed by an oscillation. 6) Verfahren nach den vorherigen Ansprüchen, dadurch gekenn­zeichnet, dass wenigstens während des Oeffnungshubes der Schieberplatte (5) Spülgas in den Ausguss (2) und/oder das Giessrohr (8) eingeführt wird.6) Method according to the preceding claims, characterized in that at least during the opening stroke of the slide plate (5), flushing gas is introduced into the spout (2) and / or the pouring tube (8).
EP88114741A 1987-12-12 1988-09-09 Method for keeping open the flow conduit of slide gate nozzles in continuous casting plants Expired - Lifetime EP0320575B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88114741T ATE89772T1 (en) 1987-12-12 1988-09-09 METHOD OF KEEPING THE FLOW CHANNEL CLEAR OF SLIDING CAPS ON CONTINUOUS CASTING PLANTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873742215 DE3742215A1 (en) 1987-12-12 1987-12-12 METHOD FOR KEEPING THE FLOW CHANNEL FROM SLIDING CLOSURES ON CONTINUOUS CASTING SYSTEMS
DE3742215 1987-12-12

Publications (3)

Publication Number Publication Date
EP0320575A2 true EP0320575A2 (en) 1989-06-21
EP0320575A3 EP0320575A3 (en) 1990-06-13
EP0320575B1 EP0320575B1 (en) 1993-05-26

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EP88114741A Expired - Lifetime EP0320575B1 (en) 1987-12-12 1988-09-09 Method for keeping open the flow conduit of slide gate nozzles in continuous casting plants

Country Status (18)

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US (1) US4890665A (en)
EP (1) EP0320575B1 (en)
JP (1) JP2756683B2 (en)
KR (1) KR960013885B1 (en)
CN (1) CN1013081B (en)
AR (1) AR240268A1 (en)
AT (1) ATE89772T1 (en)
BR (1) BR8806518A (en)
CA (1) CA1322448C (en)
CZ (1) CZ284252B6 (en)
DE (2) DE3742215A1 (en)
ES (1) ES2042668T3 (en)
FI (1) FI85958C (en)
MX (1) MX170737B (en)
PL (1) PL163968B1 (en)
RU (1) RU2038887C1 (en)
SK (1) SK281170B6 (en)
ZA (1) ZA888711B (en)

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DE3869957D1 (en) * 1988-08-31 1992-05-14 Metacon Ag METHOD FOR CONTROLLING SLIDING CLOSURES, IN PARTICULAR ON CONTINUOUS CASTING PLANTS.
WO1995017872A1 (en) * 1993-12-28 1995-07-06 Daito Electric Machine Industry Company Limited Vibration massager
GB9501263D0 (en) * 1995-01-23 1995-03-15 Snowden Pte Ltd A door assembly
GB2311947A (en) * 1996-03-12 1997-10-15 Flogates Ltd Sliding gate valve
DE19807114B4 (en) * 1998-02-20 2006-11-23 Sms Demag Ag Method for monitoring the quality of the casting process of a continuous casting plant
CN1264628C (en) * 2001-11-13 2006-07-19 维苏维尤斯·克鲁斯布公司 Multi-hole, multi-edge control plate for linear sliding gate
US9964498B2 (en) * 2015-09-11 2018-05-08 Baylor University Electromagnetic steam energy/quality, flow, and fluid property sensor and method
ES2791304T3 (en) * 2016-07-26 2020-11-03 Viega Tech Gmbh & Co Kg Device for reducing the flow of water from a sanitary flush tank, evacuation valve and sanitary flush tank with such a device

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DE3344127A1 (en) * 1982-06-09 1985-06-20 Brown, Boveri & Cie Ag, 6800 Mannheim Method and apparatus for filling a continuous casting mould when casting on a strand
DE3422901C2 (en) * 1984-06-20 1987-02-05 Metacon AG, Zürich Process for pouring a metallic melt
DE3608503A1 (en) * 1986-03-14 1987-09-17 Stopinc Ag METHOD FOR AUTOMATICALLY POURING A STRAND OF CONTINUOUS CASTING PLANTS

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JPS49139325U (en) * 1973-04-02 1974-11-30
CH653269A5 (en) * 1981-06-01 1985-12-31 Metacon Ag METHOD FOR PREVENTING THE FREEZING OF METAL MELT IN THE OUTLET CHANNEL OF A CASTING VESSEL.
JPS603952A (en) * 1983-06-20 1985-01-10 Sumitomo Metal Ind Ltd Pouring method of molten metal
US4730660A (en) * 1984-09-05 1988-03-15 Metacon Aktiengesellschaft Process for casting molten metal into several strands
DE3509932A1 (en) * 1985-03-19 1986-10-02 Metacon AG, Zürich METHOD FOR STARTING UP A CONTINUOUS CASTING SYSTEM
JPS61212460A (en) * 1985-03-19 1986-09-20 Sumitomo Metal Ind Ltd Device for preventing clogging of molten steel pouring passage of continuous casting installation
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Publication number Priority date Publication date Assignee Title
DE2926863A1 (en) * 1979-07-03 1981-01-15 Zimmermann & Jansen Gmbh METHOD FOR CONTROLLING THE SPOUT SLIDER OF A VESSEL
DE3344127A1 (en) * 1982-06-09 1985-06-20 Brown, Boveri & Cie Ag, 6800 Mannheim Method and apparatus for filling a continuous casting mould when casting on a strand
DE3422901C2 (en) * 1984-06-20 1987-02-05 Metacon AG, Zürich Process for pouring a metallic melt
DE3608503A1 (en) * 1986-03-14 1987-09-17 Stopinc Ag METHOD FOR AUTOMATICALLY POURING A STRAND OF CONTINUOUS CASTING PLANTS

Also Published As

Publication number Publication date
CZ284252B6 (en) 1998-10-14
DE3742215A1 (en) 1989-06-22
AR240268A1 (en) 1990-03-30
CN1013081B (en) 1991-07-10
FI885707A (en) 1989-06-13
ES2042668T3 (en) 1993-12-16
EP0320575A3 (en) 1990-06-13
ATE89772T1 (en) 1993-06-15
KR960013885B1 (en) 1996-10-10
FI85958B (en) 1992-03-13
JPH026041A (en) 1990-01-10
EP0320575B1 (en) 1993-05-26
FI85958C (en) 1992-06-25
US4890665A (en) 1990-01-02
CN1034156A (en) 1989-07-26
PL163968B1 (en) 1994-06-30
PL276316A1 (en) 1989-08-21
CS770088A3 (en) 1992-12-16
KR890009503A (en) 1989-08-02
DE3742215C2 (en) 1991-07-04
FI885707A0 (en) 1988-12-09
JP2756683B2 (en) 1998-05-25
RU2038887C1 (en) 1995-07-09
BR8806518A (en) 1989-08-22
SK281170B6 (en) 2000-12-11
ZA888711B (en) 1990-05-30
CA1322448C (en) 1993-09-28
DE3881356D1 (en) 1993-07-01
MX170737B (en) 1993-09-10

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