EP0137118B1 - Shielding apparatus for a pouring stream of liquid material - Google Patents

Shielding apparatus for a pouring stream of liquid material Download PDF

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Publication number
EP0137118B1
EP0137118B1 EP84107391A EP84107391A EP0137118B1 EP 0137118 B1 EP0137118 B1 EP 0137118B1 EP 84107391 A EP84107391 A EP 84107391A EP 84107391 A EP84107391 A EP 84107391A EP 0137118 B1 EP0137118 B1 EP 0137118B1
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EP
European Patent Office
Prior art keywords
bellows
screening
gas
skirt
screening device
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Expired
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EP84107391A
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German (de)
French (fr)
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EP0137118A1 (en
Inventor
Ernst Meier
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Fhi Finanz- Handels- und Investment AG
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Fhi Finanz- Handels- und Investment AG
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Priority to AT84107391T priority Critical patent/ATE26662T1/en
Publication of EP0137118A1 publication Critical patent/EP0137118A1/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
    • B22D11/106—Shielding the molten jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
    • B22D37/005—Shielding the molten metal stream

Definitions

  • the invention relates to a shielding device for a pouring stream of liquid material according to the preamble of claim 1.
  • a shielding device of this type is known from DE-PS 28 34 746.
  • the bellows is provided at both ends with ring flanges and can be connected in a sealing manner to the bottom of a casting vessel and the top of a mold.
  • the lower ring flange can be raised quickly with the aid of a lifting device up to the upper ring flange while folding the bellows.
  • a protective gas is introduced into the space surrounding the pouring stream via a gas distribution ring, which is connected to a supply line leading to the outside.
  • a gas distribution ring which is connected to a supply line leading to the outside.
  • maintaining a protective gas atmosphere in the space surrounding the jet is countered by the fact that the bellows leaks relatively quickly. If this leak occurs during a pouring process, an increased protective gas supply must be used to prevent air from entering the jet in order to avoid reoxidation. Otherwise the pouring process must be interrupted, which is undesirable.
  • the costs for the corresponding frequent replacement of the bellows have an unfavorable effect on the operating costs.
  • the object of the invention is to provide a shielding device which ensures an extension of the service life of the operating personnel with improved thermal protection.
  • the present invention is based on the knowledge that for the service life of an airtight bellows not only the mechanical stress during folding and the radiation heat are significant, but also that splashes occur in normal casting operation and can lead to damage.
  • the bellows are freed from the functions of splash and radiation protection and these tasks are overlaid on the shielding shirt, the thermal load on the bellows is considerably reduced and the gas impermeability is permanently maintained.
  • the thermal load on the bellows is further reduced by the gas cushion in the gas distribution chamber. It is important here that the gas is in motion, dissipates heat absorbed in the gas distribution chamber into the space surrounding the pouring jet and is replaced by fresh, cooler gas.
  • the average of gas distributed over the shielding shirt also ensures a distributed preparation of the same on the hot side of this shielding shirt. This can prevent individual surface areas on the hot side from reaching temperatures that would lead to accelerated aging. Even if the gas experiences considerable heating as it flows through the gas distribution chamber, it is still able to exert a cooling effect which reduces the permanent thermal load when it passes through or exits the shielding shirt.
  • a textile structure made of silicon dioxide filaments is expediently used for the shielding shirt and is not damaged even by splashes of a steel pouring jet.
  • the gas cushion in the gas distribution chamber has the effect that the shielding shirt and the bellows are kept radially distant from one another, insofar as they can move independently of one another.
  • the shielding shirt which can also be pushed together due to its flexibility, does not prevent the bellows from being pushed together.
  • one or more stiffening rings for the shielding shirt where the axial extension thereof is greater than 1 in relation to the diameter. This prevents wrinkles from forming when pushed together, which could get into dangerous proximity of the pouring stream.
  • Both the shielding shirt and the bellows preferably expand from top to bottom and have the shape of truncated cones or pyramids. Thanks to the invention, z. B. in the case of truncated cones, a relatively small upper diameter can be assumed without the risk that the shielding shirt could be damaged or destroyed as a result of the proximity to the pouring jet.
  • the ends of the bellows and shielding shirt can be detachably attached individually to a common upper and lower ring flange made of metal and connected to one another via these.
  • the entry means in the form of a connection and a channel connected to it and opening into the chamber can also be provided in one of the two ring flanges. This configuration allows the bellows and shirt to be replaced individually.
  • the entry means can be formed by a connecting piece inserted in the bellows.
  • the fresh gas is then introduced into the outer chamber, from which it then enters the inner chamber, distributed through the intermediate shell.
  • a gas cushion forms in the outer chamber, which as a whole has a temperature which is significantly lower than that of the cushion adjacent to the shirt.
  • the drawing shows a vertical section of part of a continuous caster, e.g. for steel, consisting of a mold 1 and a distribution vessel 2.
  • the distribution vessel 2 discharges a pouring jet 4 into the mold 1 through a bottom spout 3.
  • a shielding device In order to prevent air from entering the pouring stream 4 and the melt in the mold 1 and thereby reducing the load to reduce the operating personnel, in particular by the direct heat radiation of the pouring jet, a shielding device, generally designated 10, extends between the jacket 6 of the distributor vessel 2 and the upper side 5 of the mold 1.
  • the shielding device 10 comprises a bellows 11 which is circular in cross section and coaxially surrounds the pouring jet 4.
  • the bellows 11, which consists of a gas-tight material, is given its cross-sectional shape by being clamped by means of clamping rings 8 between two ring flanges 12 and 13.
  • the ring flange 12 is on the top 5 of the mold 1 by fastening means, not shown, for. B. Stand studs and clamping wedges. Anderseis the ring flange 13 is attached to the boom 14 of a lifting mechanism in the form of a cylinder-piston unit 15.
  • the cylinder 16 of the unit 15 is on the mold 1 e.g. rigidly attached, while the piston rod 18 connected to the piston 17 carries the boom 14.
  • the unit presses the ring flange 13 against the jacket 6 of the distribution vessel 2 via the arm 14.
  • Sealing rings 19 and 20 are provided between the ring flanges 12 and 13 and the upper side 5 or the jacket 6 in order to achieve a gas-tight connection of the bellows to the mold or the distribution vessel.
  • a centering ring 7 is provided on the jacket 6 within the ring flange 13.
  • an annular gas distribution chamber 21 is provided within the bellows 11, which surrounds the space 22 penetrated by the pouring jet 4 and is delimited by a shielding shirt 23.
  • an inlet connection 24 inserted into the bellows 11, which is connected in a manner not shown to a source of protective gas.
  • the shirt 23 is formed from a material that is gas-permeable and fire-proof. This can be a textile structure, e.g. act a fabric made of silicon dioxide filaments.
  • the material of which is a plasticized tissue, e.g. B. can be a silicone-coated glass fiber fabric
  • the shielding shirt 23 is flexible. Its ends are also fastened to the ring flanges 12 and 13 by means of clamping rings 8, but with smaller diameters than the corresponding ends of the bellows 11.
  • Bellows 11 and shielding shirt 23 have the shape of truncated cones with the same cone angles, which are arranged upright, but have different base diameters.
  • a stiffening ring 25 is arranged horizontally somewhat above half the height and over the entire circumference, for. B. connected to the shirt by loops attached to this. If the upper ring flange 13 is lowered by actuating the unit 15, the bellows 11 and the shirt 23 folding, the stiffening ring 25 limits the width of the folds and prevents fold parts from getting into the vicinity of the axis of the pouring jet 4. In the lowered position of the ring 13, the truncated cone shape of the bellows and shirt enables the folds to be distributed over a larger diameter range and thus a reduced material stress when pushed together.
  • the shielding shirt 23 effectively shields the bellows 11 against represents above the pouring stream and retains both splashes and heat radiation, the shirt 23, despite its porosity, also acts as insulation with respect to the heat present in the room 22. This is because the shielding shirt is flowed through from the outside inwards by protective gas from the insulating gas cushion. The direction of flow of the protective gas is opposite to the temperature gradient, the temperature in the gas cushion being considerably lower than that on the outside of the shirt 23 as a result of the constant renewal. Thus, when flowing through and distributing gas on the inside of shirt 23, heat is at least more likely to be removed.
  • the cross-section of the shielding device and in particular with respect to the cross-sectional shape is adapted to the format to be poured or the size and shape of any gas opening into which the pouring jet enters.
  • the shielding device it is expedient to design the shielding device as a truncated pyramid with a corresponding aspect ratio.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Continuous Casting (AREA)
  • Diaphragms And Bellows (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Seasonings (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Joints Allowing Movement (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

An apparatus for screening a stream of molten metal has a bellows. An annular distribution chamber for protective gas to be blown into an area traversed by the stream of molten metal is provided inside the bellows. That annular chamber is inwardly delimited by a flexible screening shroud of heat-resistant, gas-permeable material encompassing the area traversed by the stream of molten metal and being inwardly spaced from the bellows. Corresponding ends of the bellows and shroud are gas-tightly interconnected. The screening shroud surrounding the pouring stream at a distance protects the bellows from metal splashes and screen it also from heat that is radiating from the pouring stream.

Description

Die Erfindung betrifft eine Abschirmvorrichtung für einen Giessstrahl aus flüssigem Material nach dem Oberbegriff von Anspruch 1.The invention relates to a shielding device for a pouring stream of liquid material according to the preamble of claim 1.

Eine Abschirmvorrichtung dieser Art ist aus der DE-PS 28 34 746 bekannt. Der Balg ist dabei an seinen beiden Enden mit Ringflanschen versehen und über diese einerseits mit dem Boden eines Giessgefässes und anderseits mit der Oberseite einer Kokille dichtend verbindbar.A shielding device of this type is known from DE-PS 28 34 746. The bellows is provided at both ends with ring flanges and can be connected in a sealing manner to the bottom of a casting vessel and the top of a mold.

Um die Ausgussdüse dieses Giessgefässes und gegebenenfalls die Giessstrecke zugänglich zu machen, lässt sich der untere Ringflansch mit Hilfe einer Hubvorrichtung bis zum oberen Ringflansch unter Faltung des Balges rasch anheben.In order to make the pouring nozzle of this pouring vessel and, if necessary, the pouring section accessible, the lower ring flange can be raised quickly with the aid of a lifting device up to the upper ring flange while folding the bellows.

In den den Giessstrahl umgebenden Raum wird ein Schutzgas über einen Gasverteilring eingeführt, der an eine nach aussen führende Versorgungsleitung angeschlossen ist. Der Aufrechterhaltung einer Schutzgasatmosphäre in dem den Strahl umgebebenden Raum steht allerdings die Tatsache entgegen, dass der Balg relativ rasch undicht wird. Tritt diese Undichtheit während eines Abgiessvorganges auf, so muss mittels erhöhter Schutzgaszufuhr versucht werden, den Zutritt von Luft zum Strahl zur Vermeidung der Reoxidation zu verhindern. Andernfalls muss der Abgiessvorgang unterbrochen werden, was unerwünscht ist. Neben den Kosten für hohen Schutzgasverbrauch wirken sich insbesondere die Kosten für den entsprechenden häufigen Ersatz des Balges ungünstig auf die Betriebskosten aus.A protective gas is introduced into the space surrounding the pouring stream via a gas distribution ring, which is connected to a supply line leading to the outside. However, maintaining a protective gas atmosphere in the space surrounding the jet is countered by the fact that the bellows leaks relatively quickly. If this leak occurs during a pouring process, an increased protective gas supply must be used to prevent air from entering the jet in order to avoid reoxidation. Otherwise the pouring process must be interrupted, which is undesirable. In addition to the costs for high shielding gas consumption, the costs for the corresponding frequent replacement of the bellows have an unfavorable effect on the operating costs.

Aufgabe der Erfindung ist die Schaffung einer Abschirmvorrichtung, die bei verbessertem Wärmeschutz für das Bedienungspersonal eine Verlängerung ih rer Standzeit gewährleistet.The object of the invention is to provide a shielding device which ensures an extension of the service life of the operating personnel with improved thermal protection.

Die vorliegende Erfindung geht von der Erkenntnis aus, dass für die Standzeit eines luftdichten Balges nicht nur die mechanische Beanspruchung bei der Faltung und die Belastung durch die Strahlungswärme massgeblich sind, sondern, dass Spritzer auch im nomralen Giessbetrieb auftreten und zu einer Beschädigung führen können.The present invention is based on the knowledge that for the service life of an airtight bellows not only the mechanical stress during folding and the radiation heat are significant, but also that splashes occur in normal casting operation and can lead to damage.

Die Lösung der erfindungsgemässen Aufgabe erfolgt mit den kennzeichnenden Merkmalen von Anspruch 1.The object according to the invention is achieved with the characterizing features of claim 1.

Das Abschirmhemd erfüllt in bezug auf den Schutz des Balges mehrere Funktionen, indem dieses

  • - Spritzer abfängt,
  • - vom Giessstrahl erzeugte Wärmestrahlung blockiert,
  • - ein thermisch isolierendes Gaspolster begrenzt, und schliesslich
  • - den Wechsel von Gas im Gaspolster (durch axial und am Umfang verteiltes Abströmen in den Giessstrahl umgebenden Raum) ermöglicht.
The shielding shirt fulfills several functions in relation to the protection of the bellows by this
  • - catches splashes,
  • - blocked heat radiation generated by the pouring jet,
  • - a thermally insulating gas cushion limits, and finally
  • - The change of gas in the gas cushion (by axially and circumferentially distributed discharge into the pouring stream surrounding space) enables.

Dadurch, das erfindungsgemäss der Balg von den Aufgaben des Spritzer- und des Strahlenschutzes befreit und diese Aufgaben dem Abschirmhemd überbündet werden, vermindert sich die Wärmebelastung des Balges schon hierdurch erheblich, und dessen Gasundurchlässigkeit bleibt dauernd erhalten.As a result of the fact that, according to the invention, the bellows are freed from the functions of splash and radiation protection and these tasks are overlaid on the shielding shirt, the thermal load on the bellows is considerably reduced and the gas impermeability is permanently maintained.

Die Wärmebelastung des Balges wird durch das in der Gasverteilkammer vorhandene Gaspolster noch weiter vermindert. Von Bedeutung ist dabei, dass das Gas in Bewegung ist, in der Gasverteilkammer aufgenommene Wärme in den den Giessstrahl umgebenden Raum abführt und durch frisches kühleres Gas ersetzt wird.The thermal load on the bellows is further reduced by the gas cushion in the gas distribution chamber. It is important here that the gas is in motion, dissipates heat absorbed in the gas distribution chamber into the space surrounding the pouring jet and is replaced by fresh, cooler gas.

Der über das Abschirmhemd verteilte Durchschnitt von Gas gewährleistet auch eine verteilte Ausbereitung desselben an der heissen Seite dieses Abschirmhemdes. Dadurch kann verhindert werden, dass einzelne Oberflächenbereiche der heissen Seite Temperaturen erreichen, die zu einer beschleunigten Alterung führen würden. Auch wenn das Gas beim Durchströmen der Gasverteilkammer eine erhebliche Erwärmung erfährt, ist es noch in der Lage, beim Durchtritt durch bzw. Austritt aus dem Abschirmhemd eine die Wärme-Dauerbelastung vermindernde Kühlwirkung auszuüben.The average of gas distributed over the shielding shirt also ensures a distributed preparation of the same on the hot side of this shielding shirt. This can prevent individual surface areas on the hot side from reaching temperatures that would lead to accelerated aging. Even if the gas experiences considerable heating as it flows through the gas distribution chamber, it is still able to exert a cooling effect which reduces the permanent thermal load when it passes through or exits the shielding shirt.

Zweckmässigerweise wird für das Abschirmhemd ein textiles Gebilde aus Siliziumdioxyd-Filamenten verwendet, das auch durch Spritzer eines Stahl-Giessstrahles nicht beschädigt wird.A textile structure made of silicon dioxide filaments is expediently used for the shielding shirt and is not damaged even by splashes of a steel pouring jet.

Das Gaspolster in der Gasverteilkammer hat schliesslich auch die Wirkung, dass das Abschirmhemd und der Balg voneinander radial distanziert gehalten werden, soweit diese sich unabhängig voneinander bewegen können.Finally, the gas cushion in the gas distribution chamber has the effect that the shielding shirt and the bellows are kept radially distant from one another, insofar as they can move independently of one another.

Das Zusammenschieben des Balges wird durch das Abschirmhemd, das infolge seiner Flexibilität ebenfalls zusammenschiebbar ist, nicht behindert.The shielding shirt, which can also be pushed together due to its flexibility, does not prevent the bellows from being pushed together.

Es hat sich gezeigt, dass sich Versteifungsringe, die eine regelmässige Faltung von Balg und Abschirmhemd beim Zusammenschieben bewirken würden, erübrigen. _It has been shown that stiffening rings, which would cause the bellows and shielding shirt to fold regularly, are not necessary. _

Hingegen ist es zweckmässig, einen oder mehrere Versteifungsringe für das Abschirmhemd dort vorzusehen, wo die axiale Erstreckung desselben im Verhältnis zum Durchmesser grösser als 1 ist. Damit wird verhindert, dass beim Zusammenschieben Falten gebildet werden, die in gefährliche Nähe des Giessstrahles gelangen könnten.On the other hand, it is expedient to provide one or more stiffening rings for the shielding shirt where the axial extension thereof is greater than 1 in relation to the diameter. This prevents wrinkles from forming when pushed together, which could get into dangerous proximity of the pouring stream.

Vorzugsweise erweitern sich sowohl das Abschirmhemd als auch der Balg von oben nach unten und haben die Form von Kegel- oder Pyramiden-Stümpfen. Dank der Erfindung kann dabei z. B. bei Kegelstümpfen von einem verhältnismässig kleinen oberen Durchmesser ausgegangen werden, ohne Gefahr, dass infolge der Nähe zum Giessstrahl das Abschirmhemd beschädigt oder zerstört werden könnte.Both the shielding shirt and the bellows preferably expand from top to bottom and have the shape of truncated cones or pyramids. Thanks to the invention, z. B. in the case of truncated cones, a relatively small upper diameter can be assumed without the risk that the shielding shirt could be damaged or destroyed as a result of the proximity to the pouring jet.

Die Enden von Balg und Abschirmhemd könnenn einzeln an je einem gemeinsamen oberen und unteren Ringflansch aus Metall lösbar befestigt und über diesen miteinander verbunden sein. Dabei können beispielsweise in einen der beiden Ringflansche auch die Eintrittsmittel in Form eines Anschlusses sowie eines mit diesem verbundenen Kanales, der in der Kammer ausmündet, vorgesehen sein. Diese Ausgestaltung gestattet es, Balg und Hemd einzeln auszuwechseln.The ends of the bellows and shielding shirt can be detachably attached individually to a common upper and lower ring flange made of metal and connected to one another via these. In this case, for example, the entry means in the form of a connection and a channel connected to it and opening into the chamber can also be provided in one of the two ring flanges. This configuration allows the bellows and shirt to be replaced individually.

Da aber ein Ersatz weniger häufig notwendig ist bzw. beide Teile ähnlich lange Standzeiten haben, kann es sich rechtfertigen, Balg und Hemd nicht nur gemeinsam an den Ringflanschen zu befestigen, sondern deren Enden unmittelbar miteinander zu verbinden. In diesem Fall können die Eintrittsmittel durch einen im Balg eingesetzten Stutzen gebildet sein.However, since replacement is less often necessary or both parts have a similarly long service life, it can be justified not only to fasten the bellows and shirt together on the ring flanges, but to connect their ends directly to one another. In this case, the entry means can be formed by a connecting piece inserted in the bellows.

Um die Wärmebelastung des Balges, insbesondere bei extremen Bedingungen, weiter zu verringern, sind mehrere Möglichkeiten offen. Beispielsweise kann zusätzlich zu oder anstelle einer mehrlagigen Ausbildung des Hemdes eine weitere, z.B. einlagige Zwischenhülle - aus gleichem Material wie das Hemd und ebenfalls gasdurchlässig ausgebildet-eine äussere Gasverteilkammer begrenzen, welche die an das Hemd angrenzende Kammer umgibt und den Balg gegenüber dieser distanziert und thermisch isoliert. Die Einleitung des frischen Gases erfolgt dann in die äussere Kammer, aus welcher diese dann verteilt durch die Zwischenhülle hindurch in die innere Kammer eintritt. Mithin bildet sich in der äusseren Kammer ein Gaspolster, das als Ganzes eine Temperatur hat, die wesentlich unter jener des an das Hemd angrenzenden Polsters liegt.In order to further reduce the thermal load on the bellows, particularly in extreme conditions, several options are open. For example, in addition to or instead of a multi-layer design of the shirt, another, e.g. Single-layer intermediate sheath - made of the same material as the shirt and also made gas-permeable - delimit an outer gas distribution chamber, which surrounds the chamber adjacent to the shirt and distances and thermally insulates the bellows from it. The fresh gas is then introduced into the outer chamber, from which it then enters the inner chamber, distributed through the intermediate shell. As a result, a gas cushion forms in the outer chamber, which as a whole has a temperature which is significantly lower than that of the cushion adjacent to the shirt.

Alternativ oder zusätzlich ist es auch möglich, den Gaswechsel im einzigen bzw. in den Gaspolstern dadurch zu intensivieren, dass erwärmtes Gas abgeführt und gekühlt wieder zugeführt wird.As an alternative or in addition, it is also possible to intensify the gas change in the single or in the gas cushions by removing heated gas and feeding it in again in a cooled state.

Die erfindungsgemässe Abschirmvorrichtung ist nachfolgend anhand eines Ausführungsbeispieles und unter Bezugnahme auf die Zeichnung näher erläutert.The shielding device according to the invention is explained in more detail below using an exemplary embodiment and with reference to the drawing.

Die Zeichnung zeigt im Vertikalschnitt einen Teil einer Stranggiessanlage, z.B. für Stahl, bestehend aus einer Kokille 1 und einem Verteilergefäss 2. Das Verteilergefäss 2 entlässt durch einen Bodenausguss 3 einen Giessstrahl 4 in die Kokille 1. Um den Zutritt von Luft zum Giessstrahl 4 und zur Schmelze in der Kokille 1 zu verhindern und dabei die Belastung des Betriebspersonales insbesondere durch die unmittelbare Wärmestrahlung des Giessstrahles zu vermindern, erstreckt sich zwischen dem Mantel 6 des Verteilergefässes 2 und der Oberseite 5 der Kokille 1 eine generell mit 10 bezeichnete Abschirmvorrichtung.The drawing shows a vertical section of part of a continuous caster, e.g. for steel, consisting of a mold 1 and a distribution vessel 2. The distribution vessel 2 discharges a pouring jet 4 into the mold 1 through a bottom spout 3. In order to prevent air from entering the pouring stream 4 and the melt in the mold 1 and thereby reducing the load to reduce the operating personnel, in particular by the direct heat radiation of the pouring jet, a shielding device, generally designated 10, extends between the jacket 6 of the distributor vessel 2 and the upper side 5 of the mold 1.

Die Abschirmvorrichtung 10 umfasst einen Balg 11 der im Querschnitt kreisförmig ist und den Giessstrahl 4 koaxial umgibt. Seine Querschnittform erhält der Balg 11, der aus einem gasdichten Material besteht, durch die Einspannung mittels Spannringen 8 zwischen zwei Ringflanschen 12 und 13.The shielding device 10 comprises a bellows 11 which is circular in cross section and coaxially surrounds the pouring jet 4. The bellows 11, which consists of a gas-tight material, is given its cross-sectional shape by being clamped by means of clamping rings 8 between two ring flanges 12 and 13.

Der Ringflansch 12 ist dabei an der Oberseite 5 der Kokille 1 durch nicht dargestellte Befestigungsmittel, z. B. Stehbolzen und Spannkeile gehalen. Anderseis ist der Ringflansch 13 am Ausleger 14 eines Hubmechanismus in Form einer Zylinder-Kolbeneinheit 15 befestigt.The ring flange 12 is on the top 5 of the mold 1 by fastening means, not shown, for. B. Stand studs and clamping wedges. Anderseis the ring flange 13 is attached to the boom 14 of a lifting mechanism in the form of a cylinder-piston unit 15.

In der dargestellten Anordnung ist der Zylinder 16 der Einheit 15 an der Kokille 1 z.B. starr befestigt, während die mit dem Kolben 17 verbundene Kolbenstange 18 den Ausleger 14 trägt. Über den Ausleger 14 presst die Einheit den Ringflansch 13 an den Mantel 6 des Verteilgefässes 2 an. Zwischen den Ringflanschen 12 und 13 und der Oberseite 5 bzw. dem Mantel 6 sind Dichtungsringe 19 und 20 vorgesehen, um einen gasdichten Anschluss des Balges an die Kokille bzw. das Verteilgefäss zu erreichen. Innerhalb des Ringflansches 13 ist am Mantel 6 eine Zentrierring 7 vorgesehen.In the arrangement shown, the cylinder 16 of the unit 15 is on the mold 1 e.g. rigidly attached, while the piston rod 18 connected to the piston 17 carries the boom 14. The unit presses the ring flange 13 against the jacket 6 of the distribution vessel 2 via the arm 14. Sealing rings 19 and 20 are provided between the ring flanges 12 and 13 and the upper side 5 or the jacket 6 in order to achieve a gas-tight connection of the bellows to the mold or the distribution vessel. A centering ring 7 is provided on the jacket 6 within the ring flange 13.

Erfindungsgemäss ist bei der dargestellten Abschirmvorrichtung 10 innerhalb des Balges 11 eine ringförmige Gasverteilkammer 21 vorgesehen, die den vom Giessstrahl 4 durchsetzten Raum 22 umgibt und gegenüber diesem durch ein Abschirmhemd 23 begrenzt ist. In die Gasverteilkammer 21 führt ein, in den Balg 11 eingesetzter Eintrittsstutzen 24, der in nicht dargestellter Weise an eine Quelle von Schutzgas angeschlossen ist. Im Unterschied zum gasdichten Material des Balges 11 ist das Hemd 23 aus einem Material gebildet, dass gasdurchlässig und feuerfest ist. Hierbei kann es sich um ein textiles Gebilde, z.B. ein Gewebe aus Siliziumdioxyd-Filamenten handeln. Gleich wie der Balg 11, dessen Material ein plastifiziertes Gewebe, z. B. ein mit Silikon beschichtetes Glasfasergewebe sein kann, ist auch das Abschirmhemd 23 flexibel. Dessen Enden sind dabei an den Ringflanschen 12 bzw. 13 ebenfalls durch Spannringe 8 befestigt, jedoch auf kleineren Durchmessern als die entsprechenden Enden des Balges 11.According to the invention, in the shielding device 10 shown, an annular gas distribution chamber 21 is provided within the bellows 11, which surrounds the space 22 penetrated by the pouring jet 4 and is delimited by a shielding shirt 23. Into the gas distribution chamber 21 leads an inlet connection 24 inserted into the bellows 11, which is connected in a manner not shown to a source of protective gas. In contrast to the gas-tight material of the bellows 11, the shirt 23 is formed from a material that is gas-permeable and fire-proof. This can be a textile structure, e.g. act a fabric made of silicon dioxide filaments. Same as the bellows 11, the material of which is a plasticized tissue, e.g. B. can be a silicone-coated glass fiber fabric, the shielding shirt 23 is flexible. Its ends are also fastened to the ring flanges 12 and 13 by means of clamping rings 8, but with smaller diameters than the corresponding ends of the bellows 11.

Balg 11 und Abschirmhemd 23 haben die Form von Kegelstümpfen mit gleichen Kegelwinkeln, die aufrecht angeordnet sind, jedoch unterschiedliche Basisdurchmesser besitzen. An der Aussenseite des Abschirmhemdes 23 ist ein Versteifungsring 25 horizontal etwas oberhalb der halben Höhe angeordnet und über den ganzen Umfang, z. B. durch am Hemd angebrachte Schlaufen, mit diesem verbunden. Wird der obere Ringflansch 13 durch Betätigung der Einheit 15 abgesenkt, wobei sich Balg 11 und Hemd 23 falten, so begrenzt der Versteifungsring 25 die Faltenbreite und verhindert, dass Faltenteile in die Nachbarschaft der Achse des Giessstrahles 4 gelangen könnten. In der abgesenkten Stellung des Ringes 13 ermöglicht die Kegelstumpfform von Balg und Hemd eine Verteilung der Falten über einen grösseren Durchmesserbereich und damit eine verminderte Materialbeanspruchung im zusammengeschobenen Zustand.Bellows 11 and shielding shirt 23 have the shape of truncated cones with the same cone angles, which are arranged upright, but have different base diameters. On the outside of the shield shirt 23, a stiffening ring 25 is arranged horizontally somewhat above half the height and over the entire circumference, for. B. connected to the shirt by loops attached to this. If the upper ring flange 13 is lowered by actuating the unit 15, the bellows 11 and the shirt 23 folding, the stiffening ring 25 limits the width of the folds and prevents fold parts from getting into the vicinity of the axis of the pouring jet 4. In the lowered position of the ring 13, the truncated cone shape of the bellows and shirt enables the folds to be distributed over a larger diameter range and thus a reduced material stress when pushed together.

Im Betrieb der Abschirmvorrichtung 10 herrscht im Raum 22 ein Überdruck, der ausreicht, um einen Zutritt von Luft zur Schmelze mit Sicherheit zu vermeiden. Druckverluste im Raum 22 werden dadurch ausgeglichen, dass durch das luftdurchlässige Abschirmhemd 23 Schutzgas aus der Gasverteilkammer 21 nachströmt. Hierzu wird der Gasverteilkammer 21 ständig Schutzgas unter Druck durch den Stutzen 24 zugeführt. In der Gasverteilkammer bildet sich ein Gaspolster mit einem gegenüber dem Druck im Raum 22 höheren Druck.During operation of the shielding device 10, there is an overpressure in the space 22 which is sufficient to reliably prevent air from entering the melt. Pressure losses in space 22 are compensated for by the fact that protective gas flows in through gas-permeable shielding shirt 23 from gas distribution chamber 21. For this purpose, protective gas is continuously supplied to the gas distribution chamber 21 through the nozzle 24 under pressure. A gas cushion with a higher pressure than the pressure in the space 22 forms in the gas distribution chamber.

Davon abgesehen, dass das Abschirmhemd 23 eine wirksame Abschirmung des Balges 11 gegenüber dem Giessstrahl darstellt und sowohl Spritzer wie auch die Wärmestrahlung zurückhält, wirkt das Hemd 23 trotz seiner Porosität auch als Isolation in bezug auf die im Raum 22 vorhandene Wärme. Dies ist deshalb der Fall, weil das Abschirmhemd von aussen nach innen von Schutzgas aus dem isolierenden Gaspolster durchströmt wird. Die Strömungsrichtung des Schutzgases ist dabei dem Temperaturgefälle entgegengesetzt, wobei die Temperatur im Gaspolster infolge-der ständigen Erneuerung schon erheblich unter jener an der Aussenseite des Hemdes 23 liegt. Mithin wird bei Durchströmen und der Gasverteilung an dessen Innenseite am Hemd 23 zumindest tendenziell eher Wärme entzogen.Apart from that, the shielding shirt 23 effectively shields the bellows 11 against represents above the pouring stream and retains both splashes and heat radiation, the shirt 23, despite its porosity, also acts as insulation with respect to the heat present in the room 22. This is because the shielding shirt is flowed through from the outside inwards by protective gas from the insulating gas cushion. The direction of flow of the protective gas is opposite to the temperature gradient, the temperature in the gas cushion being considerably lower than that on the outside of the shirt 23 as a result of the constant renewal. Thus, when flowing through and distributing gas on the inside of shirt 23, heat is at least more likely to be removed.

Statt die entsprechenden Enden des Balges 11 bzw. des Hemdes 23 getrennt und auf unterschiedlichen Durchmessern an den Ringflansch 12 bzw. 13 zu befestigen, können diese unter Anpassung der Durchmesser gemeinsam durch je einen einzigen Spannring befestigt sein. Weiterhin ist es dabei auch möglich, die Enden von Balg und Abschirmhemd unmittelbar miteinander zu verbinden, um eine von den Ringflanschen 12 und 13 unabhängige Einheit für den Transport und die Lagerung zu bilden und die Montage an den Ringflanschen zu erleichtern. Auf jeden Fall bildet sich zwischen Balg und Hemd im Betrieb unter dem herrschenden Überdruck ein Gaspolster, das den Balg mit Ausnahme seiner Enden vom Hemd distanziert hält.Instead of attaching the corresponding ends of the bellows 11 or the shirt 23 separately and with different diameters to the ring flange 12 or 13, these can be attached together by adjusting the diameter by means of a single clamping ring. Furthermore, it is also possible to connect the ends of the bellows and shielding shirt directly to one another in order to form a unit for transport and storage that is independent of the ring flanges 12 and 13 and to facilitate assembly on the ring flanges. In any case, a gas cushion forms between the bellows and the shirt during operation under the prevailing excess pressure, which keeps the bellows apart from the shirt with the exception of its ends.

Es versteht sich von selbst, dass die Abschirmvorrichtung in ihrem Querschnitt und insbesondere in bezug auf die Querschnittsform dem abzugiessenden Format bzw.- der Grösse und Form einer allfälligen Gafässöffnung, in welche der Giessstrahl eintritt, angepasst ist. So ist es beim Giessen von Brammen zweckmässig, die Abschirmvorrichtung als Pyramidenstumpf mit einem entsprechenden Seitenverhältnis auszubilden.It goes without saying that the cross-section of the shielding device and in particular with respect to the cross-sectional shape is adapted to the format to be poured or the size and shape of any gas opening into which the pouring jet enters. When casting slabs, it is expedient to design the shielding device as a truncated pyramid with a corresponding aspect ratio.

Claims (10)

1. Screening device for a pouring stream of molten metal, in particular for arrangement between a pouring vessel (2) for metallic melts and a mould (1) with collapsible, gastight bellows (11), and also inlet means (24) for a protective gas, which is intended to be blown into the space (22) surrounding the pouring stream (4), characterized by at least one annular gas distribution chamber (21), provided within the bellows (11), which gas distribution chamber is in connection with the inlet means (24) and limited inwards by a flexible screening skirt (23) of gas-permeable heat-resistant material, screening skirt (23) and bellows (11) being connected gastight to each other at their corresponding ends.
2. Screening device according to claim 1, characterized in that the gas distribution chamber (21) is limited outwards by the bellows (11).
3. Screening device according to claim 1 or 2, characterized in that the inlet means are provided in the form of a connecting piece (24) on the bellows (11).
4. Screening device according to claim 2, characterized in that bellows (11) and screening skirt (23) delimit a corss-section increasing from to bottom.
5. Screening device according to claim 4, characterized in that bellows (11) and screening skirt (23) have the shape of truncated cones with preferably the same cone angle.
6. Creening device according to claim 5, characterized in that the diameters at the ends of bellows (11) and screening skirt (23) are approximately the same.
7. Screening device according to one of the preceding claims, characterized in that bellows (11) and screening skirt (23) form one assembly and transportation unit.
8. Screening device according to claim 7, characterized in that bellows (11) and screening skirt (23) are connected at their ends jointly by one ring in each case.
9. Screening device according to claim 8, characterized in that the rings are designed as annular flanges.
10. Screening device according to claim 2, characterized in that the screening skirt (23) is connected on its outside to a reinforcing ring (25).
EP84107391A 1983-08-12 1984-06-27 Shielding apparatus for a pouring stream of liquid material Expired EP0137118B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84107391T ATE26662T1 (en) 1983-08-12 1984-06-27 SHIELDING DEVICE FOR A POURING JET OF LIQUID MATERIAL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4415/83 1983-08-12
CH4415/83A CH660700A5 (en) 1983-08-12 1983-08-12 SHIELDING DEVICE FOR A MOLDING BEAM FROM LIQUID MATERIAL.

Publications (2)

Publication Number Publication Date
EP0137118A1 EP0137118A1 (en) 1985-04-17
EP0137118B1 true EP0137118B1 (en) 1987-04-22

Family

ID=4275716

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84107391A Expired EP0137118B1 (en) 1983-08-12 1984-06-27 Shielding apparatus for a pouring stream of liquid material

Country Status (9)

Country Link
US (1) US4565239A (en)
EP (1) EP0137118B1 (en)
JP (1) JPS60216958A (en)
AT (1) ATE26662T1 (en)
CA (1) CA1219726A (en)
CH (1) CH660700A5 (en)
DE (2) DE3463222D1 (en)
ES (1) ES280558Y (en)
ZA (1) ZA846102B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0410651A2 (en) * 1989-07-26 1991-01-30 LTV Steel Company, Inc. Apparatus and method for shrouding of liquid steel during filling of ingot molds
EP0505035A1 (en) * 1991-03-22 1992-09-23 Allegheny Ludlum Corporation Method and device for shrouding a stream of molten metal
FR2783732A1 (en) * 1998-09-28 2000-03-31 Ascometal Sa INERT DEVICE FOR CONTINUOUS METAL CASTING LINGOTIER

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Publication number Priority date Publication date Assignee Title
FR2586210B1 (en) * 1985-08-14 1988-05-13 Air Liquide DEVICE FOR PROTECTION AGAINST OXIDATION AND / OR NITRURATION OF A LIQUID METAL JET AND ITS USE
US4717052A (en) * 1986-07-11 1988-01-05 Aluminum Company Of America Molten metal conduit
DE4027662C2 (en) * 1990-08-31 1994-02-10 Rexroth Mannesmann Gmbh Potting furnace
GB9615765D0 (en) * 1996-07-26 1996-09-04 Foseco Int Shrouding means
KR100832427B1 (en) * 2001-12-21 2008-05-26 주식회사 포스코 An Apparatus Keeping Temperature of Probe Nozzle
KR100868504B1 (en) * 2002-05-29 2008-11-12 주식회사 포스코 Device for protecting splash of hot-steel in mold of continuous casting line
KR100773834B1 (en) 2006-12-18 2007-11-06 주식회사 포스코 Device for preventing splash of ingot steel
RU187633U1 (en) * 2018-06-26 2019-03-14 Публичное акционерное общество "Северсталь" Device for protecting a metal stream during continuous casting of high-quality billets with a cross section of up to 150 mm
DE102019004255A1 (en) * 2019-06-14 2020-12-17 Linde Gmbh Method of gravity casting, bellows and bellows use

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US4084799A (en) * 1976-08-30 1978-04-18 Georgetown Steel Corporation Shrouding apparatus
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GB2111879B (en) * 1981-12-04 1985-06-19 Air Prod & Chem Apparatus for shielding molten metal during teeming

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0410651A2 (en) * 1989-07-26 1991-01-30 LTV Steel Company, Inc. Apparatus and method for shrouding of liquid steel during filling of ingot molds
EP0410651A3 (en) * 1989-07-26 1992-04-22 Ltv Steel Company, Inc. Apparatus and method for shrouding of liquid steel during filling of ingot molds
EP0505035A1 (en) * 1991-03-22 1992-09-23 Allegheny Ludlum Corporation Method and device for shrouding a stream of molten metal
FR2783732A1 (en) * 1998-09-28 2000-03-31 Ascometal Sa INERT DEVICE FOR CONTINUOUS METAL CASTING LINGOTIER
EP0990474A1 (en) * 1998-09-28 2000-04-05 ASCOMETAL (Société anonyme) Inert gas shrouding device for moulds for the continuous casting of metals

Also Published As

Publication number Publication date
US4565239A (en) 1986-01-21
ATE26662T1 (en) 1987-05-15
EP0137118A1 (en) 1985-04-17
JPH0112583B2 (en) 1989-03-01
JPS60216958A (en) 1985-10-30
DE3463222D1 (en) 1987-05-27
ZA846102B (en) 1985-03-27
CH660700A5 (en) 1987-06-15
ES280558U (en) 1985-06-16
DE8420823U1 (en) 1984-10-11
ES280558Y (en) 1986-04-01
CA1219726A (en) 1987-03-31

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