EP0293564B1 - Method for feeding flushing gas into a discharge hole with a slide gate nozzle for metallurgical vessels - Google Patents

Method for feeding flushing gas into a discharge hole with a slide gate nozzle for metallurgical vessels Download PDF

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Publication number
EP0293564B1
EP0293564B1 EP88104040A EP88104040A EP0293564B1 EP 0293564 B1 EP0293564 B1 EP 0293564B1 EP 88104040 A EP88104040 A EP 88104040A EP 88104040 A EP88104040 A EP 88104040A EP 0293564 B1 EP0293564 B1 EP 0293564B1
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EP
European Patent Office
Prior art keywords
pressure
gas
flushing gas
line
nozzles
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EP88104040A
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German (de)
French (fr)
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EP0293564A2 (en
EP0293564A3 (en
Inventor
Bruno MÜLLER
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Stopinc AG
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Stopinc AG
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Priority to AT88104040T priority Critical patent/ATE69186T1/en
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Publication of EP0293564A3 publication Critical patent/EP0293564A3/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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/42—Features relating to gas injection

Definitions

  • the invention relates to a method, in particular for introducing purge gas, into a pouring opening of metallurgical vessels having a sliding closure through nozzles arranged in the closing area of the closure plate via a controlled line originating from a gas source.
  • the object of the present invention is to improve the introduction of purge gas by means of closed closure plates to the effect that the melt can automatically flow out of the pouring opening after each opening of the sliding closure.
  • the object is achieved according to the invention in that when a predetermined flushing gas counterpressure is reached and / or immediately before the closing plate is opened, at least one pressure jet generated by a compressed gas source of at least 12 bar in the pouring opening clears. In this way, the 100 percent self-flow rate that is now required by the foundry companies after opening the sliding closure can be achieved with relatively little effort, thus avoiding expensive termination of the pouring operation.
  • the pressure jet is introduced over a very short adjustable period of time, preferably only over fractions of a second.
  • the procedure is appropriately such that three nozzle jets act symmetrically in the pouring opening and the switching of the pressure waves caused by the nozzle jets takes place with the aid of the flushing gas counterpressure with a consistency of the melt in the pouring opening which tends to solidify.
  • the pressure wave is preferably stored within a pressure train in a volumetrically coordinated pressure vessel, which is in the open There is a line connection to a compressed gas source and a closed line connection to the flushing gas line, the open connection to the compressed gas source being closed at the same time when the pressure wave is switched. This easily creates pressure waves with the same amount of gas, which can also be easily controlled.
  • a further proposal of the invention is that air, argon or a gas-solid mixture is injected into the pouring opening for the flowable preparation of the melt.
  • the additional blowing of the nozzle jet through the porous plug ensures the distribution of the purge gas over the entire cross section of the pouring opening.
  • the nozzles become blocked, they are blown free by introducing a nozzle jet when the closure is open. However, the condition is that the plug comes to lie outside the base plate.
  • 1 means the pouring opening of a metallurgical vessel (not shown in more detail), which begins on the inlet side at the perforated brick 2 and is otherwise formed by the inlet sleeve 3 and the fixed base plate 4.
  • a metallurgical vessel (not shown in more detail), which begins on the inlet side at the perforated brick 2 and is otherwise formed by the inlet sleeve 3 and the fixed base plate 4.
  • On the refractory base plate 4 is a refractory linearly adjustable in the arrow directions 5 Closure plate 6, whose flow opening 7 continues the pouring opening 1 when the closure is open.
  • flushing gas is introduced into the pouring opening 1 through nozzles 8 of a stopper 9 arranged in the closing region of the plate 6, which is made of gas-permeable porous or high-strength refractory material, in order to prevent the melt above the closure plate 6 from freezing.
  • the gas flows to the stopper nozzles 8 from a gas space 10 arranged in the closure plate 6 below the stopper 9, which in turn is connected to a gas channel 11 leading to the plate circumference, the stopper 9 and the gas space 10 being fixed to the gas channel 11 connected sheet metal shell 9 'are surrounded and thereby leakage losses can be largely avoided.
  • the shut-off valve 16 which is designed as a solenoid valve, is controlled by a processor 23, which in turn receives measured values from the pressure switch 20 and position values of the position meter 24 of the slide closure actuation.
  • the gas source 13 and the line 14 and an adjoining connecting line 25 serve to supply a constant gas flow via the gas connection 12 to the plug nozzles 8 in a desired amount of gas, which can be set manually on the throttle valve 17 and by the subsequent mass flow controller 18 to the set value is held at changing back pressure due to different flow conditions in the pouring opening 1.
  • a further gas introduction is provided to ensure self-leakage which by means of bullet-like nozzle jets generated by a pressure wave at the plug nozzles 8 outflow obstacles in the Spout 1 eliminated.
  • a pressure line 30 which starts from a compressed gas source 31 at approximately 200 bar and opens into the double check valve 22.
  • a pressure reducer 32 Arranged in between are a pressure reducer 32, a shut-off valve 33, a pressure vessel 34 and a further shut-off valve 35.
  • Both shut-off valves 33 and 35 which in turn are designed as solenoid valves, receive closing and opening commands from the processor 23.
  • the processor 23 has opened the shut-off valve 16 of the line 14 of the constant gas flow, so that flushing gas flows to the nozzle plug 9 with a gas pressure set on the pressure reducer 15, which, if no other operating modes of higher pressure are of priority, at least the nozzles 8 protects against penetration of the melt.
  • the pressure wave which passes on the way to the nozzles 8, the part of the common double check valve 22 located on the pressure line 35 and the common connection 25, is released from the pressure vessel 34, which has an open connection to the pressure gas source 31 during normal operation and with that on the pressure reducer 32 set pressure of about 15 to 30 bar, while its volume corresponds to a coordinated amount of compressed gas.
  • the shut-off valve 35 behind the pressure vessel 34 opens to release the pressure wave, the otherwise open shut-off valve 33 in front closes and shuts off the connection to the compressed gas source 31.
  • the part of the double check valve 22 belonging to the line 14 closes, but can also remain open if the valve is designed accordingly, so that the pressure wave overlaps the constant gas flow of the line 14.
  • a stopper 9 which has three nozzles 8 formed by bores, which are axially symmetrical with the mouths to the axis of the pouring opening 1, but as shown in FIG.
  • the diameter of the nozzles 8 can be between 2 and 7 mm.
  • a sheet metal casing 9 surrounds the stopper 9 and the gas space 10 underneath.
  • Plugs with 5 non-symmetrically arranged nozzles have also proven successful, the plugs being made of a porous gas-permeable refractory material.

Abstract

The intention is to improve the introduction of flushing gas via the closed gate plate (6) in order to achieve if possible a one hundred per cent spontaneous outflow rate after the opening of the gate. When a predetermined backpressure of the flushing gas is reached and/or immediately prior to the opening of the gate plate (6), at least one jet produced by a pressure wave of at least 12 bar frees blockages arising in the nozzle (1) for spontaneous flow. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren, insbesondere zum Einführen von Spülgas, in eine einen Schiebeverschluß aufweisende Ausgußöffnung metallurgischer Gefäße durch im Schließbereich der Verschlußplatte angeordnete Düsen über eine von einer Gasquelle ausgehende gesteuerte Leitung.The invention relates to a method, in particular for introducing purge gas, into a pouring opening of metallurgical vessels having a sliding closure through nozzles arranged in the closing area of the closure plate via a controlled line originating from a gas source.

Im Prinzip dienen solche in Schließstellung des Verschlusses durchgeführte Gaseinführungsverfahren dazu, etwaigen Einfrierungen bzw. Batzenbildungen infolge von beispielsweise an den Wandungen der Ausgußöffnung erkaltete Schmelze vorzubeugen, zumindest aber die Schmelze bis zur nächsten Öffnung des Verschlusses zum Selbstausfluß fließfähig zu halten. Dies gelingt mit den bekannten Verfahren und Einrichtungen nicht immer, vielmehr bleibt die Ausgußöffnung nach Öffnen der Verschlußplatte in einer nicht befriedigenden Rate verstopft und muß meist manuell mit einer Sauerstofflanze freigebrannt werden, was umständlich, zeitraubend und kostspielig ist.In principle, such gas introduction methods carried out in the closed position of the closure serve to prevent any freezing or lump formation due to melt cooled, for example, on the walls of the pouring opening, but at least to keep the melt flowable for the self-outflow until the next opening of the closure. This does not always succeed with the known methods and devices, rather the pouring opening remains blocked at an unsatisfactory rate after opening the closure plate and usually has to be burned manually with an oxygen lance, which is cumbersome, time-consuming and costly.

Aus der DE- 35 06 426 ist ferner ein Spülgasverfahren bekannt, mit dem während des Gießens sich in der Ausgußöffnung aufbauenden Ablagerungen entgegengewirkt wird und gebildete Zuschmierungen beseitigt werden. Hierzu ist neben einer kontinuierlichen, eine impulsartige Gaseinführung vorgesehen, die beide durch gesteuerten Einsatz die Ausgußöffnung freihalten sollen.From DE-35 06 426 a flushing gas process is also known, with which deposits built up in the pouring spout are counteracted during casting and smearings formed are removed. For this purpose, in addition to a continuous, pulsed gas introduction, both of which are intended to keep the pouring opening free by controlled use.

Aufgabe vorliegender Erfindung ist es, Spülgaseinführungen durch geschlossene Verschlußplatten dahingehend zu verbessern, daß nach jedem Öffnen des Schiebeverschlusses der Selbstausfluß der Schmelze aus der Ausgußöffnung möglich ist.The object of the present invention is to improve the introduction of purge gas by means of closed closure plates to the effect that the melt can automatically flow out of the pouring opening after each opening of the sliding closure.

Die gestellte Aufgabe wird gemäß der Erfindung dadurch gelöst, daß bei Erreichen eines vorbestimmten Spülgas-Gegendruckes und/oder unmittelbar vor dem Öffnen der Verschlußplatte mindestens ein durch eine Druckgasquelle von wenigstens 12 bar erzeugter Druckstrahl in der Ausgußöffnung entstehende Verstopfungen freimacht. Auf diese Weise kann die heutzutage von den Gießbetrieben als unerläßlich geforderte, hundertprozentige Selbstflußrate nach Öffnen des Schiebeverschlusses mit verhältnismäßig geringem Aufwand erreicht und damit ein kostspieliger Gießabbruch vermieden werden.The object is achieved according to the invention in that when a predetermined flushing gas counterpressure is reached and / or immediately before the closing plate is opened, at least one pressure jet generated by a compressed gas source of at least 12 bar in the pouring opening clears. In this way, the 100 percent self-flow rate that is now required by the foundry companies after opening the sliding closure can be achieved with relatively little effort, thus avoiding expensive termination of the pouring operation.

Der Druckstrahl wird dabei über eine sehr kurze einstellbare Zeitspanne, vorzugsweise nur über Sekundenbruchteile, eingeleitet.The pressure jet is introduced over a very short adjustable period of time, preferably only over fractions of a second.

Im einzelnen wird dabei zweckmäßig so vorgegangen, daß drei Düsenstrahlen symmetrisch in die Ausgußöffnung wirken und die Schaltung der durch die Düsenstrahlen bewirkten Druckwellen mit Hilfe des Spülgas-Gegendruckes bei einer zur Verfestigung neigenden Konsistenz der Schmelze in der Ausgußöffnung erfolgt. Konkret bedeutet dies, je nach Auslegung der Gaseinführungsanlage und des verwendeten Spülgasdruckes, dazugehörige Gegendruckwerte von etwa 5 bis 50 %. Vorzugsweise ist die Druckwelle innerhalb eines Druckstranges in einem volumetrisch abgestimmten Druckkessel gespeichert, der in offener Leitungsverbindung zu einer Druckgasquelle und in geschlossener Leitungsverbindung zu der Spülgasleitung steht, wobei bei Schaltung der Druckwelle gleichzeitig die offene Verbindung zur Druckgasquelle geschlossen wird. Dadurch kommen auf einfache Art Druckwellen mit gleichen Gasmengen zustande, die zudem problemlos steuerbar sind.In detail, the procedure is appropriately such that three nozzle jets act symmetrically in the pouring opening and the switching of the pressure waves caused by the nozzle jets takes place with the aid of the flushing gas counterpressure with a consistency of the melt in the pouring opening which tends to solidify. Specifically, this means, depending on the design of the gas introduction system and the purge gas pressure used, the associated back pressure values of about 5 to 50%. The pressure wave is preferably stored within a pressure train in a volumetrically coordinated pressure vessel, which is in the open There is a line connection to a compressed gas source and a closed line connection to the flushing gas line, the open connection to the compressed gas source being closed at the same time when the pressure wave is switched. This easily creates pressure waves with the same amount of gas, which can also be easily controlled.

Ein weiterer Vorschlag der Erfindung besteht darin, daß für die fließfähige Aufbereitung der Schmelze in die Ausgußöffnung Luft, Argon oder ein Gas-Feststoff-Gemisch eingedüst wird.A further proposal of the invention is that air, argon or a gas-solid mixture is injected into the pouring opening for the flowable preparation of the melt.

Das zusätzliche Durchblasen des Düsenstrahles durch den porösen Stopfen sichert die Verteilung des Spülgases über den gesamten Querschnitt der Ausgußöffnung.The additional blowing of the nozzle jet through the porous plug ensures the distribution of the purge gas over the entire cross section of the pouring opening.

Bei allfälliger Verstopfung der Düsen werden diese in Offenstellung des Verschlusses durch Einleitung eines Düsenstrahles freigeblasen. Bedingung ist jedoch, daß der Stopfen außerhalb der Bodenplatte zu liegen kommt.If the nozzles become blocked, they are blown free by introducing a nozzle jet when the closure is open. However, the condition is that the plug comes to lie outside the base plate.

Die Erfindung ist nachstehend anhand der Zeichnung ausführungsweise erläutert.

Figur 1
zeigt in vereinfachter Darstellung einen Schnitt durch einen eine Gaseinführung aufweisenden Schiebeverschluß mit Steuereinrichtung,
Figur 2
einen Schnitt durch einen Gaseinführungsstopfen, und
Figur 3
die Draufsicht zu Figur 2.
The invention is explained in detail below with reference to the drawing.
Figure 1
shows a simplified representation of a section through a slide closure having a gas inlet with control device,
Figure 2
a section through a gas introduction plug, and
Figure 3
the top view of Figure 2.

In der Zeichnung bedeutet 1 die Ausgußöffnung eines nicht näher dargestellten metallurgischen Gefäßes, die einlaufseitig am Lochstein 2 beginnt und ansonsten von der Einlaufhülse 3 sowie der ortsfesten Bodenplatte 4 gebildet wird. An der feuerfesten Bodenplatte 4 liegt eine in den Pfeilrichtungen 5 linear verstellbare feuerfeste Verschlußplatte 6 an, deren Durchflußöffnung 7 bei geöffnetem Verschluß die Ausgußöffnung 1 fortsetzt. Hingegen wird in der in Figur 1 gezeigten Schließstellung durch Düsen 8 eines im Schließbereich der Platte 6 angeordneten Stopfens 9, der aus gasdurchlässigem porösem oder hochfestem Feuerfestmaterial hergestellt ist, Spülgas in die Ausgußöffnung 1 eingeführt zur Einfrierverhinderung der über der Verschlußplatte 6 stehenden Schmelze.In the drawing, 1 means the pouring opening of a metallurgical vessel (not shown in more detail), which begins on the inlet side at the perforated brick 2 and is otherwise formed by the inlet sleeve 3 and the fixed base plate 4. On the refractory base plate 4 is a refractory linearly adjustable in the arrow directions 5 Closure plate 6, whose flow opening 7 continues the pouring opening 1 when the closure is open. On the other hand, in the closed position shown in FIG. 1, flushing gas is introduced into the pouring opening 1 through nozzles 8 of a stopper 9 arranged in the closing region of the plate 6, which is made of gas-permeable porous or high-strength refractory material, in order to prevent the melt above the closure plate 6 from freezing.

Hierbei strömt das Gas den Stopfendüsen 8 aus einem in der Verschlußplatte 6 unterhalb des Stopfens 9 angeordneten Gasraum 10 zu, der seinerseits mit einem zum Plattenumfang führenden Gaskanal 11 in Verbindung steht, wobei der Stopfen 9 und der Gasraum 10 von einer mit dem Gaskanal 11 fest verbundenen Blechhülle 9′ umgeben sind und dadurch Leckverluste weitgehend vermieden werden können. Es ist ein Gasanschluß 12 für eine von einer Gasquelle 13 ausgehende Leitung 14 vorgesehen, in der in Strömungsrichtung hintereinander ein Druckreduzierer 15, ein Absperrventil 16, ein Drosselventil 17 und gegebenenfalls ein Mengendurchflußregler 18 sowie ein Manometer 19, ein Druckschalter 20, ein Rückschlagventil 21 und ein Doppelrückschlagventil 22 angeordnet sind. Davon wird das als Magnetventil ausgebildete Absperrventil 16 von einem Prozessor 23 gesteuert, der seinerseits Meßwerte vom Druckschalter 20 und Stellungswerte des Stellungsmessers 24 der Schiebeverschlußbetätigung erhält.Here, the gas flows to the stopper nozzles 8 from a gas space 10 arranged in the closure plate 6 below the stopper 9, which in turn is connected to a gas channel 11 leading to the plate circumference, the stopper 9 and the gas space 10 being fixed to the gas channel 11 connected sheet metal shell 9 'are surrounded and thereby leakage losses can be largely avoided. There is a gas connection 12 for a line 14 emanating from a gas source 13, in which a pressure reducer 15, a shut-off valve 16, a throttle valve 17 and optionally a mass flow controller 18 as well as a pressure gauge 20, a pressure switch 20, a check valve 21 and a double check valve 22 are arranged. Of this, the shut-off valve 16, which is designed as a solenoid valve, is controlled by a processor 23, which in turn receives measured values from the pressure switch 20 and position values of the position meter 24 of the slide closure actuation.

Die Gasquelle 13 und die Leitung 14 sowie eine daran anschließende Anschlußleitung 25 dienen zum Zuführen eines konstanten Gasstromes über den Gasanschluß 12 zu den Stopfendüsen 8 in einer gewünschten Gasmenge, die von Hand am Drosselventil 17 einstellbar ist und durch den nachfolgenden Mengendurchflußregler 18 auf dem eingestellten Wert gehalten wird, bei infolge von unterschiedlichen Strömungsbedingungen in der Ausgußöffnung 1 sich änderndem Gegendruck. Neben dieser üblichen konstanten Gaseinführung durch die Leitung 14, die im allgemeinen mit einem Gasdruck nicht über 10 bar arbeitet und die nach Öffnen des Schiebeverschlusses nicht in jedem Fall die Schmelze selbstfließend aus der Ausgußöffnung 1 austreten läßt, ist zum Sicherstellen des Selbstauslaufes eine weitere Gaseinführung vorgesehen, die mittels geschoßartiger, durch eine Druckwelle an den Stopfendüsen 8 erzeugter Düsenstrahlen Ausflußhindernisse in der Ausgußöffnung 1 beseitigt. Hierzu dient ein Druckstrang 30, der von einer Druckgasquelle 31 mit etwa 200 bar ausgeht und in das Doppelrückschlagventil 22 mündet. Dazwischen sind angeordnet, ein Druckreduzierer 32, ein Absperrventil 33, ein Druckkessel 34 sowie ein weiteres Absperrventil 35. Beide wiederum als Magnetventile ausgebildete Absperrventile 33 und 35 erhalten Schließ- und Öffnungsbefehle vom Prozessor 23.The gas source 13 and the line 14 and an adjoining connecting line 25 serve to supply a constant gas flow via the gas connection 12 to the plug nozzles 8 in a desired amount of gas, which can be set manually on the throttle valve 17 and by the subsequent mass flow controller 18 to the set value is held at changing back pressure due to different flow conditions in the pouring opening 1. In addition to this usual constant gas introduction through line 14, which generally works with a gas pressure of not more than 10 bar and which does not allow the melt to flow out of pouring opening 1 in any case after opening the sliding closure, a further gas introduction is provided to ensure self-leakage which by means of bullet-like nozzle jets generated by a pressure wave at the plug nozzles 8 outflow obstacles in the Spout 1 eliminated. For this purpose, a pressure line 30 is used, which starts from a compressed gas source 31 at approximately 200 bar and opens into the double check valve 22. Arranged in between are a pressure reducer 32, a shut-off valve 33, a pressure vessel 34 and a further shut-off valve 35. Both shut-off valves 33 and 35, which in turn are designed as solenoid valves, receive closing and opening commands from the processor 23.

In der Schließstellung der Verschlußplatte 6 hat der Prozessor 23 das Absperrventil 16 der Leitung 14 des konstanten Gasstromes geöffnet, so daß Spülgas dem Düsenstopfen 9 mit einem am Druckreduzierer 15 eingestellten Gasdruck zufließt, der, falls keine anderen Betriebsweisen höheren Drucks vorrangig sind, wenigstens die Düsen 8 vor Eindringen der Schmelze schützt. Ändert sich während des Betriebes der Zustand der Schmelze in der Ausgußöffnung 1 durch Erkalten, so baut sich in der Strangleitung 14 ein immer größer werdender Druck auf, der bei Erreichen eines am Druckschalter 20 eingestellten Maximums den Prozessor 23 veranlaßt, das Absperrventil 35 im Druckstrang 30 zu öffnen und damit eine Druckwelle freizugeben, die an den Düsen 8 Düsenstrahlen von solcher Wucht form, daß erstarrte Schmelze auf- bzw. von den Wänden der Ausgußöffnung 1 losbricht und Schmelzebatzen in wärmere Schmelzezonen am Ausgußeinlauf abgeführt werden. Die Druckwelle, die auf dem Weg zu den Düsen 8 den am Druckstrang 35 gelegenen Teil des gemeinsamen Doppelrückschlagventils 22 und die gemeinsame Anschluß 25 passiert, wird aus dem Druckkessel 34 entlassen, der im Normalbetrieb offene Verbindung zur Druckgasquelle 31 hat und mit dem am Druckreduzierer 32 eingestellten Druck von etwa 15 bis 30 bar belastet wird, während sein Volumen einer dazu abgestimmten Druckgasmenge entspricht. Sobald das Absperrventil 35 hinter dem Druckkessel 34 zur Freigabe der Druckwelle öffnet, schließt das sich davor befindliche, ansonsten offene Absperrventil 33 und sperrt die Verbindung zur Druckgasquelle 31 ab. Weiterhin schließt beim Auslösen der Druckwelle der zur Leitung 14 gehörende Teil des Doppelrückschlagventils 22, der bei entsprechender Ausbildung des Ventils aber auch offen bleiben kann, so daß die Druckwelle den konstanten Gasstrom der Leitung 14 überlagert.In the closed position of the closure plate 6, the processor 23 has opened the shut-off valve 16 of the line 14 of the constant gas flow, so that flushing gas flows to the nozzle plug 9 with a gas pressure set on the pressure reducer 15, which, if no other operating modes of higher pressure are of priority, at least the nozzles 8 protects against penetration of the melt. If the state of the melt in the pouring opening 1 changes due to cooling during operation, an increasing pressure builds up in the branch line 14, which causes the processor 23, the shut-off valve 35 in the pressure branch 30, when the maximum set at the pressure switch 20 is reached to open and thus release a pressure wave, which forms 8 jet streams of such force at the nozzles that solidified melt breaks up or breaks off from the walls of the pouring opening 1 and melt chips are discharged into warmer melt zones at the pouring spout. The pressure wave, which passes on the way to the nozzles 8, the part of the common double check valve 22 located on the pressure line 35 and the common connection 25, is released from the pressure vessel 34, which has an open connection to the pressure gas source 31 during normal operation and with that on the pressure reducer 32 set pressure of about 15 to 30 bar, while its volume corresponds to a coordinated amount of compressed gas. As soon as the shut-off valve 35 behind the pressure vessel 34 opens to release the pressure wave, the otherwise open shut-off valve 33 in front closes and shuts off the connection to the compressed gas source 31. Furthermore, when the pressure wave is triggered, the part of the double check valve 22 belonging to the line 14 closes, but can also remain open if the valve is designed accordingly, so that the pressure wave overlaps the constant gas flow of the line 14.

Damit die Blechhülle 9′ bei der Erzeugung einer Druckwelle nicht nach unten herausgestoßen wird, ist ein an der Platte 6 befestigtes Verstärkungsblech 6′ unterhalb des mit der Blechhülle 9′ zusammengeschweißten Gaskanals 11 vorgesehen.So that the sheet metal casing 9 'is not ejected downward when generating a pressure wave, a reinforcing plate 6' attached to the plate 6 'is provided below the gas duct 11' welded together with the sheet metal casing 9 '.

Gemäß Figuren 2 und 3 ist ein Stopfen 9 verwendet, der drei durch Bohrungen gebildete Düsen 8 aufweist, die mit den Mündungen achsensymmetrisch zur Achse der Ausgußöffnung 1 stehen, jedoch wie Figur 3 strichpunktiert zeigt, zum Erzeilen eines Dralleffektes in der Längsachse geneigt sein können. Je nach Verschlußleistung kann der Durchmesser der Düsen 8 zwischen 2 und 7 mm betragen.According to Figures 2 and 3, a stopper 9 is used, which has three nozzles 8 formed by bores, which are axially symmetrical with the mouths to the axis of the pouring opening 1, but as shown in FIG. Depending on the sealing performance, the diameter of the nozzles 8 can be between 2 and 7 mm.

Wiederum umgibt eine Blechhülle 9′ den Stopfen 9 sowie den darunter befindlichen Gasraum 10.In turn, a sheet metal casing 9 'surrounds the stopper 9 and the gas space 10 underneath.

Bewährt haben sich auch Stopfen mit 5 nicht symmetrisch angeordneten Düsen, wobei die Stopfen aus einem porösen gasdurchlässigen Feuerfestmaterial bestehen.Plugs with 5 non-symmetrically arranged nozzles have also proven successful, the plugs being made of a porous gas-permeable refractory material.

Claims (9)

  1. Method of injecting particularly a flushing gas into a discharge opening, which has a sliding gate valve, of metallurgical vessels through nozzles arranged in the closure region of the valve plate via a controlled line starting from a gas source, characterised in that on reaching a predetermined flushing gas counter-pressure and/or directly before the opening of the valve plate at least one nozzle jet produced by a compressed gas source at at least 12 bar clears obstructions forming in the discharge opening (1).
  2. Method as claimed in Claim 1, characterised in that the nozzle jet is introduced in each case for only a very short, adjustable period of time, preferably for only fractions of a second.
  3. Method as claimed in Claim 1, characterised in that three nozzle jets act symmetrically in the discharge opening (1).
  4. Method as claimed in Claim 1, 2 or 3, characterised in that the control of the pressure wave effected by the nozzle jet is effected with the aid of the flushing gas counter-pressure at a consistency of the melt in the discharge opening which tends towards solidification.
  5. Method as claimed in one of Claims 1 to 4, characterised in that the pressure wave is stored within a pressure line (30) in a volumetrically matched pressure tank (34) with an open connecting line to a compressed gas source (31) and a closed connecting line to the flushing gas line (14).
  6. Method as claimed in Claim 5, characterised in that when switching the pressure source the open connection of the pressure tank (34) to the compressed gas source (31) is closed.
  7. Method as claimed in one of the preceding claims, characterised in that air, argon or a gas-solid mixture is injected in.
  8. Method as claimed in one of the preceding claims, characterised in that the nozzle jet is composed of the flushing gas fed through the nozzles (8) and the flushing gas fed through the porous plug.
  9. Method as claimed in Claim 1 or 2, characterised in that in the open position of the sliding gate valve at least one nozzle jet is produced for blowing the nozzles (8) clear.
EP88104040A 1987-06-05 1988-03-15 Method for feeding flushing gas into a discharge hole with a slide gate nozzle for metallurgical vessels Expired - Lifetime EP0293564B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88104040T ATE69186T1 (en) 1987-06-05 1988-03-15 METHOD OF INTRODUCING PURGE GAS INTO A SLIDE-CLOSED POUT OF METALLURGICAL VESSELS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3718890 1987-06-05
DE3718890A DE3718890C1 (en) 1987-06-05 1987-06-05 Method for introducing purge gas into a pouring opening of metallurgical vessels with a sliding closure

Publications (3)

Publication Number Publication Date
EP0293564A2 EP0293564A2 (en) 1988-12-07
EP0293564A3 EP0293564A3 (en) 1989-10-11
EP0293564B1 true EP0293564B1 (en) 1991-11-06

Family

ID=6329148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88104040A Expired - Lifetime EP0293564B1 (en) 1987-06-05 1988-03-15 Method for feeding flushing gas into a discharge hole with a slide gate nozzle for metallurgical vessels

Country Status (11)

Country Link
US (1) US5119976A (en)
EP (1) EP0293564B1 (en)
JP (1) JPS63313655A (en)
KR (1) KR890000187A (en)
CN (1) CN1008331B (en)
AT (1) ATE69186T1 (en)
BR (1) BR8802713A (en)
DE (1) DE3718890C1 (en)
ES (1) ES2028156T3 (en)
IN (1) IN169578B (en)
ZA (1) ZA883087B (en)

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CN111545740A (en) * 2020-05-18 2020-08-18 芜湖新兴铸管有限责任公司 Automatic control system for air seal of ladle nozzle

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GB9316297D0 (en) * 1993-08-05 1993-09-22 Foseco Int Improvements in molten metal handling vessels
CH689447A5 (en) * 1994-12-16 1999-04-30 Concast Standard Ag Appts. for supplying molten steel to continuous casting moulds
US6660220B2 (en) 2001-12-21 2003-12-09 Isg Technologies Inc. Apparatus and method for delivering an inert gas to prevent plugging in a slide gate
ATE408471T1 (en) * 2005-08-27 2008-10-15 Refractory Intellectual Prop FIREPROOF CASTING NOZZLE WITH POROUS INSERT
EP2140833A1 (en) * 2008-07-03 2010-01-06 Curozone USA Inc. Dental treatment apparatus
CN103240410B (en) * 2013-05-17 2016-04-13 莱芜钢铁集团有限公司 The sliding nozzle device of Cleanliness of Molten Steel is improved by separation and recovery stuffing sand
CN103658629B (en) * 2013-12-18 2016-05-04 宁夏维尔铸造有限责任公司 Molten steel Argon pouring procedure
DE102018108569A1 (en) * 2017-04-20 2018-10-25 Ksm Castings Group Gmbh Sliding gate system, casting plant and casting process
CN114719604A (en) * 2020-06-09 2022-07-08 姜春辉 Device and method for adding materials in metal/alloy smelting process
CN114719605A (en) * 2020-06-09 2022-07-08 姜春辉 Intelligent injection device for adding materials in metal/alloy smelting process
KR102542306B1 (en) * 2021-07-21 2023-06-13 주식회사 에이텍에이피 Structure of shaft for medium transferring

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CN111545740A (en) * 2020-05-18 2020-08-18 芜湖新兴铸管有限责任公司 Automatic control system for air seal of ladle nozzle

Also Published As

Publication number Publication date
IN169578B (en) 1991-11-16
ES2028156T3 (en) 1992-07-01
CN1030037A (en) 1989-01-04
EP0293564A2 (en) 1988-12-07
DE3718890C1 (en) 1988-03-31
BR8802713A (en) 1988-12-27
ATE69186T1 (en) 1991-11-15
KR890000187A (en) 1989-03-13
US5119976A (en) 1992-06-09
ZA883087B (en) 1988-12-28
CN1008331B (en) 1990-06-13
JPS63313655A (en) 1988-12-21
JPH0317588B2 (en) 1991-03-08
EP0293564A3 (en) 1989-10-11

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