EP0538265B1 - Device for the continuous addition of casting agents to the surface of a melt in a continuous casting die - Google Patents
Device for the continuous addition of casting agents to the surface of a melt in a continuous casting die Download PDFInfo
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- EP0538265B1 EP0538265B1 EP91909146A EP91909146A EP0538265B1 EP 0538265 B1 EP0538265 B1 EP 0538265B1 EP 91909146 A EP91909146 A EP 91909146A EP 91909146 A EP91909146 A EP 91909146A EP 0538265 B1 EP0538265 B1 EP 0538265B1
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- casting
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- continuous
- screw conveyor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
Definitions
- the invention relates to a device of the type corresponding to the preamble of claim 1.
- the preferred field of application of the invention is the addition of continuous casting powder to the bath level of a continuous casting mold.
- These continuous casting powders form a layer a few centimeters thick on the bathroom mirror. They partially melt in the area in contact with the bath level and form a slag that settles between the mold wall and the solidifying strand.
- the still loose upper part of the casting powder layer has a heat-insulating effect and prevents excessive heat loss from the upper strand end.
- the casting powder By taking the molten casting powder slag with it, the casting powder continues to be consumed. This consumption is in the range of about 0.3 kg or 0.8 kg per ton of steel. This quantity must therefore be supplied continuously, while maintaining a uniform layer thickness is essential for the quality of the strand surface. Uniformity must be sought in both the vertical and horizontal directions.
- the uniformity in the vertical direction means that a certain layer thickness is maintained during the entire casting period in order to always ensure the availability of a sufficient amount of slag.
- the uniformity in the horizontal direction means the uniformity of this layer thickness over the strand cross-section in order to achieve a uniform insulation effect at every point.
- a flat conveying channel attached to the lower end of a storage container extends from the side to over the continuous casting mold.
- There is a gas distribution space below the storage container into which air can be blown in, which fluidizes the casting powder located in the channel and makes it transportable.
- air is blown in, it is conveyed from the storage container through the channel to the bath level in the continuous casting mold. If the air is turned off, the funding stops.
- the control takes place via temperature sensors, which are arranged above the mold. When the layer of casting powder on the bath level becomes thinner and the insulating effect of the powder wears off, the temperature rises and the addition of the powder is triggered. So this is not continuous, but intermittent, similar to the manual task. Therefore, an improvement of the strand surface compared to manual powder addition is not to be expected in the described automatic powder addition. This has also been confirmed in practice. Pneumatic-mechanical metering devices have not proven themselves and have not found their way into practice.
- the continuous addition of mold powder granules is to make economic sense, it is also a requirement that the granulate can be conveyed pneumatically and the granulate on the casting platform does not have to be transported in bags or big bags with industrial trucks or lifting vehicles to load the storage container of the addition device. Only if the pneumatic conveying is possible can the granulate be delivered in a silo vehicle, blown into a silo with a considerable usable volume standing in the hut corridor and pneumatically conveyed from there to the storage container in order to ensure the continuous supply of the casting powder without any manipulation the casting platform, which require additional labor. Pneumatic conveying is - especially with sequential casting - a basic requirement for the continuity of the entire casting process and the personnel savings.
- the granules from casting aids in particular from continuous casting powder, which in themselves allow a functioning addition only under the action of gravity, are so low in abrasion resistance, especially when they are present as a hollow sphere, that they are destroyed during pneumatic conveying and partly as powder or Fragments get into the hopper of the feeder. But then the already mentioned effect of the blockage occurs in the addition pipe. Apart from economic reasons, the granules are therefore also unsuitable for practical metering of continuous casting powder for technical reasons.
- the device comprises a screw conveyor running transversely above the mold with outlet nozzles, from which the mold powder emerges only with the aid of compressed air.
- the compressed air support takes place in a certain time rhythm or controlled according to the progress of the casting strand or when a breakthrough of the slag layer is discovered.
- the effort required for control and pneumatics is considerable and prone to failure. Compressed air support does not go without creating dust.
- the invention has for its object to further develop the generic device so that an optimum addition of mold powder is possible with simpler means.
- the “Chicken Feeding” principle allows automatic, consumption-based dosing without dust generation in a simple manner without external release agents such as compressed air.
- the dimensioning of the delivery capacity to double the extraction guarantees a largely uniform filling of the screw conveyor under the given operating conditions and thus uniform conditions at the individual extraction nozzles, so that even quantities emerge or the subsequent delivery is always ensured at the individual extraction nozzles.
- the extraction nozzle can consist of aluminum, for example. With their lower edge, they form the boundary of the removal point up to which the cone of ascent rises. In the event of wear, the tapping nozzles are simply replaced, as is the case when the cone height is changed should be passed over without the entire screw conveyor having to be changed in its height above the continuous casting mold.
- the screw conveyor extends across the bath level, cooling, preferably with air, is recommended.
- the bath level itself is covered by the powdered pouring aid, but in the immediate vicinity of the screw conveyor, the dip tube extends from the tundish into the upper end of the strand. This dip tube has temperatures in the order of 1000 o C.
- the fluidization according to claim 3 loosens the amount of powdered pouring aid in the storage container and makes it quasi flowable, so that it easily passes from the storage container into the screw conveyor.
- FIG. 1 shows a storage container 1, which is kept filled from a large silo 29, which is only indicated, via a pneumatic conveying line 2.
- a storage container 1 In the conical lower part 3 of the storage container 1, fluidization trays 4 are attached on the inside, which are supplied with air via supply lines 5 and fluidize the continuous casting powder 6 located in the storage container 1, ie decompose it into a swirled state in which it is easily movable.
- the fluidized continuous casting powder 6 flows from the outlet 7 at the lower end of the conical part 3 of the storage container 1 via the line 8 into the inlet 9 of a horizontal screw conveyor 10, which is driven by a drive motor 11 is driven.
- the screw conveyor 10 extends just above the upper end of the continuous casting mold 12.
- the dip tube 17 extends into the melt located in the continuous casting mold 12, ie extends to below the bath level 18, which is kept at a constant height by suitable measures.
- extraction points 19 are provided in the form of parallel extraction shafts 20, the lower limit 21 of which is located at a predetermined distance above the bath level 18, which is generally the same for all extraction shafts.
- the screw conveyor 10 comprises a tubular housing 22 in which a transport screw 23 is rotatably arranged. At the removal points 19, the housing 22 has openings 24 to which the removal shafts 20 are welded. The material conveyed past the opening 24 by the screw conveyor 23 emerges downward through the opening 24 and, since it is flowable, forms a cone 25 of powdered pouring aid. When the pouring cone 25 has risen to the lower limit 21 of the removal shaft 20, no more powdery pouring aid 6 continues to flow. However, this occurs again as soon as the cone 25 drops as a result of the melting of the powdered pouring aid 6. This type of self-regulation is known as the "chicken feeding" principle. An equilibrium state is established in which the continuous casting powder slowly flows in according to the consumption.
- a uniform layer 26 of molten casting aid i.e. a slag, which is carried over the meniscus of the bath level 18 by the strand between its outside and the inner circumference of the continuous casting mold 12.
- consumption occurs which causes the cone 25 to drop. It must be ensured that a certain minimum pouring height 27 of powdered pouring aid is maintained so that the heat insulation effect is maintained.
- the lower limit of the removal point 19 is not formed on the removal shaft 20 itself, but on an overflow port 28 made of aluminum, for example, which can be replaced when its lower end is melted or when another height of the Cone 25 is desired.
- the pressure inside the screw conveyor 10 but also plays a certain role for the discharge quantities and should therefore be as constant as possible, which means that the degree of powder filling in the screw conveyor 10 should be as constant as possible over its entire length. This is the only way to ensure that the pressure is largely the same everywhere, which contributes to the fact that all tapping points 19, regardless of their location, actually have the same amounts of powder flowing out.
- the constancy of the degree of powder filling is the better, the greater the conveying capacity of the screw conveyor 10 in relation to the quantities withdrawn. In practice, the output would have to be at least twice this amount.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Devices For Molds (AREA)
- General Induction Heating (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Screw Conveyors (AREA)
- Furnace Details (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Liquid Deposition Of Substances Of Which Semiconductor Devices Are Composed (AREA)
- Coating With Molten Metal (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Vorrichtung der dem Oberbegriff des Anspruchs 1 entsprechenden Art.The invention relates to a device of the type corresponding to the preamble of claim 1.
Das bevorzugte Anwendungsgebiet der Erfindung ist die Zugabe von Stranggießpulver auf den Badspiegel einer Stranggießkokille. Diese Stranggießpulver bilden eine einige Zentimeter dicke Schicht auf dem Badspiegel. Sie schmelzen in ihrem mit dem Badspiegel in Berührung stehenden Bereich teilweise auf und bilden eine Schlacke, die sich zwischen die Kokillenwand und den erstarrenden Strang setzt. Der noch lockere obere Anteil der Gießpulverschicht wirkt wärmeisolierend und verhindert einen zu starken Wärmeverlust des oberen Strangendes.The preferred field of application of the invention is the addition of continuous casting powder to the bath level of a continuous casting mold. These continuous casting powders form a layer a few centimeters thick on the bathroom mirror. They partially melt in the area in contact with the bath level and form a slag that settles between the mold wall and the solidifying strand. The still loose upper part of the casting powder layer has a heat-insulating effect and prevents excessive heat loss from the upper strand end.
Durch die Mitnahme der geschmolzenen Gießpulverschlacke tritt ein fortlaufender Verbrauch des Gießpulvers ein. Dieser Verbrauch liegt im Bereich von etwa 0,3kg bzw.0,8 kg pro Tonne Stahl. Diese Menge muß also fortlaufend nachgeliefert werden, wobei die Einhaltung einer gleichmäßigen Schichtdicke für die Qualität der Strangoberfläche wesentlich ist. Die Gleichmäßigkeit muß sowohl in vertikaler als auch in horizontaler Richtung angestrebt werden. Die Gleichmäßigkeit in vertikaler Richtung bedeutet die Einhaltung einer bestimmten Schichtdicke während der ganzen Gießdauer, um stets die Verfügbarkeit einer ausreichenden Menge an Schlacke zu gewährleisten. Die Gleichmäßigkeit in horizontaler Richtung bedeutet die Gleichmäßigkeit dieser Schichtdicke über den Strangquerschnitt, um eine gleichmäßige Isolierwirkung an jeder Stelle zu erzielen.By taking the molten casting powder slag with it, the casting powder continues to be consumed. This consumption is in the range of about 0.3 kg or 0.8 kg per ton of steel. This quantity must therefore be supplied continuously, while maintaining a uniform layer thickness is essential for the quality of the strand surface. Uniformity must be sought in both the vertical and horizontal directions. The uniformity in the vertical direction means that a certain layer thickness is maintained during the entire casting period in order to always ensure the availability of a sufficient amount of slag. The uniformity in the horizontal direction means the uniformity of this layer thickness over the strand cross-section in order to achieve a uniform insulation effect at every point.
Der Ausgangspunkt der Entwicklung war die manuelle Zugabe des Stranggießpulvers. Die Gleichmäßigkeit ist hierbei nicht immer gewährleistet. Auch erfordert diese Methode die Anwesenheit und ständige Aufmerksamkeit einer Bedienungsperson über die gesamte mehrstündige Gießsequenz.The starting point of the development was the manual addition of the continuous casting powder. Uniformity is not always guaranteed. This method also requires the presence and constant attention of an operator over the entire pouring sequence of several hours.
Es wurde schon bald versucht, die Zugabe von Gießhilfsmitteln beim Stranggießen zu automatisieren. Dafür sind zwei unterschiedliche Verfahrensweisen bekannt, nämlich pneumatisch-mechanisch oder rein mechanisch mit Förderern arbeitende Einrichtungen auf der einen Seite und auf der anderen Seite Einrichtungen, die unter Ausnutzung der Schwerkraft arbeiten.An attempt was soon made to automate the addition of casting aids during continuous casting. Two different procedures are known for this, namely pneumatic-mechanical or purely mechanical devices with conveyors on the one hand and devices on the other hand that work using gravity.
Bei einem bekannten Gerät der ersten Gruppe reicht ein am unteren Ende eines Vorratsbehälters angesetzter flacher Förderkanal von der Seite her bis über die Stranggießkokille. Unterhalb des Vorratsbehälters befindet sich ein Gasverteilungsraum, in den Luft eingeblasen werden kann, die das in dem Kanal befindliche Gießpulver fluidisiert und transportfähig macht. Wenn Luft eingeblasen wird, erfolgt also eine Förderung aus dem Vorratsbehälter durch den Kanal auf den Badspiegel in der Stranggießkokille. Wenn die Luft abgestellt wird, hört auch die Förderung auf. Die Steuerung erfolgt über Temperaturmeßfühler, die oberhalb der Kokille angeordnet sind. Wenn die Gießpulverschicht auf dem Badspiegel dünner wird und die Isolierwirkung des Pulvers nachläßt, steigt die Temperatur an und wird die Zugabe des Pulvers ausgelöst. Diese erfolgt also nicht kontinuierlich, sondern intermittierend, ähnlich wie bei der Handaufgabe. Daher ist bei der geschilderten automatischen Pulverzugabe eine Verbesserung der Strangoberfläche gegenüber der manueilen Pulverzugabe nicht zu erwarten. Dies hat sich auch in der Praxis bestätigt. Pneumatisch-mechanisch dosierende Einrichtungen haben sich nicht bewährt und keinen Eingang in die Praxis gefunden.In a known device of the first group, a flat conveying channel attached to the lower end of a storage container extends from the side to over the continuous casting mold. There is a gas distribution space below the storage container, into which air can be blown in, which fluidizes the casting powder located in the channel and makes it transportable. When air is blown in, it is conveyed from the storage container through the channel to the bath level in the continuous casting mold. If the air is turned off, the funding stops. The control takes place via temperature sensors, which are arranged above the mold. When the layer of casting powder on the bath level becomes thinner and the insulating effect of the powder wears off, the temperature rises and the addition of the powder is triggered. So this is not continuous, but intermittent, similar to the manual task. Therefore, an improvement of the strand surface compared to manual powder addition is not to be expected in the described automatic powder addition. This has also been confirmed in practice. Pneumatic-mechanical metering devices have not proven themselves and have not found their way into practice.
Die rein nach dem Schwerkraftprinzip arbeitenden Geräte sind zunächst ebenfalls für die Verwendung von pulverförmigem Gießhilfsmittel konzipiert worden. Von einem Vorratsbehälter führt ein geneigtes Zugaberohr bis über den Badspiegel. Die abgegebene Menge bildet auf dem Badspiegel einen Schüttkegel, der bis zum unteren Ende des Zugaberohrs hochsteigt. Es rutscht dann kein Pulver mehr nach. Erst wenn der Schüttkegel durch den Verbrauch sich von dem unteren Ende des Rohres wieder entfernt, rieselt neues Pulver nach. Diese Art der selbsttätigen Regulierung wird auch "Chicken feeding"-Prinzip genannt, weil es bei Fütterungsautomaten verbreitet ist. Es hat sich jedoch gezeigt, daß mit dieser Methode pulverförmige Gießhilfsmittel nicht zuverlässig aufbringbar sind, da es selbst bei steiler angeordneten Zugaberohren (Winkel > 30o) zu Verstopfungen kommt.The devices, which work purely on the principle of gravity, were initially also designed for the use of powdered pouring aids. An inclined addition pipe leads from a storage container to the bath level. The amount dispensed forms a cone of dirt on the bath level, which rises to the bottom of the addition pipe. Then no more powder slips. Only when the cone of consumption moves away from the lower end of the tube does new powder trickle in again. This type of automatic regulation is also called the "chicken feeding" principle because it is common in automatic feeders. It has emerged, however, that are not reliably be applied with this method powder coating aids, as it comes even with a smaller addition arranged tubes (angle> 30 °) to blockages.
Es war daher erforderlich, das Gießhilfsmittel zu granulieren, um der Verstopfungsneigung entgegenzuwirken. Mit einem Granulat ließ sich die Zugabe unter reiner Schwerewirkung funktionssicherer gestalten. Bei exakter Gießspiegelregelung war die Dicke der Granulatschicht stets gleich und somit ständig eine gleichmäßige Isolierung und eine der spezifischen Schlackenbildungsaktivität des Granulats entsprechende konstante Verfügbarkeit an Schlacke gewährleistet.It was therefore necessary to granulate the pouring aid in order to counteract the tendency to block. With a granulate, the addition could be made more reliable under pure gravity. With precise casting level control, the thickness of the granulate layer was always the same and thus a constant insulation and a constant availability of slag corresponding to the specific slag formation activity of the granulate was guaranteed.
Die Anforderungen an die Qualität des Granulats sind aber hoch. Es zeigte sich, daß Granulate, deren Kornband weniger gleichmäßig war, wie reine Pulver zu Verstopfungen im Zugaberohr führten. Die Verwendung eines klassierten Granulats mit einem engen Kornband bedeutet eine erhebliche wirtschaftliche Belastung des Verfahrens.However, the requirements for the quality of the granulate are high. It was found that granules whose grain size was less uniform, like pure powder, led to blockages in the addition pipe. The use of a classified Granules with a narrow grain band mean a considerable economic burden on the process.
Wenn die kontinuierliche Zugabe von Gießpulvergranulaten einen wirtschaftlichen Sinn haben soll, ist außerdem Voraussetzung, daß das Granulat pneumatisch gefördert werden kann und das Granulat auf der Gießbühne nicht in Säcken oder Big Bags mit Flurförderzeugen oder Hubfahrzeugen zu Beschickung des Vorratsbehälters der Zugabevorrichtung transportiert werden muß. Nur wenn die pneumatische Förderung möglich ist, kann das Granulat in einem Silofahrzeug angeliefert, in einen auf dem Hüttenflur stehenden Silo mit erheblichem Nutzvolumen eingeblasen und von dort aus zu dem Vorratsbehälter pneumatisch gefördert werden, um auf diese Weise eine kontinuierliche Bereitstellung des Gießpulvers ohne Transportmanipulationen auf der Gießbühne zu gewährleisten, die zusätzliche Arbeitskräfte erfordern. Die pneumatische Förderung ist also - vor allem beim Sequenzguß - Grundbedingung für die Kontinuität des gesamten Gießablaufes und der Personaleinsparung.If the continuous addition of mold powder granules is to make economic sense, it is also a requirement that the granulate can be conveyed pneumatically and the granulate on the casting platform does not have to be transported in bags or big bags with industrial trucks or lifting vehicles to load the storage container of the addition device. Only if the pneumatic conveying is possible can the granulate be delivered in a silo vehicle, blown into a silo with a considerable usable volume standing in the hut corridor and pneumatically conveyed from there to the storage container in order to ensure the continuous supply of the casting powder without any manipulation the casting platform, which require additional labor. Pneumatic conveying is - especially with sequential casting - a basic requirement for the continuity of the entire casting process and the personnel savings.
Die Granulate aus Gießhilfsmitteln, insbesondere aus Stranggießpulver, die an sich eine funktionierende Zugabe nur unter Schwerkraftwirkung erlauben, sind jedoch, vor allem wenn sie als Hohlkugel vorliegen, in ihrer Abriebfestigkeit so gering, daß sie bei einer pneumatischen Förderung zerstört werden und teilweise als Pulver oder Bruchstücke in den Vorratsbehälter der Zugabevorrichtung gelangen. Dann aber tritt der bereits erwähnte Effekt der Verstopfung in dem Zugaberohr auf. Das Granulat ist also außer aus wirtschaftlichen Gründen auch aus technischen Gründen für eine praktikable Dosierung von Stranggießpulver nicht geeignet.The granules from casting aids, in particular from continuous casting powder, which in themselves allow a functioning addition only under the action of gravity, are so low in abrasion resistance, especially when they are present as a hollow sphere, that they are destroyed during pneumatic conveying and partly as powder or Fragments get into the hopper of the feeder. But then the already mentioned effect of the blockage occurs in the addition pipe. Apart from economic reasons, the granules are therefore also unsuitable for practical metering of continuous casting powder for technical reasons.
Viele der vorgenannten Probleme sind bei der dem Oberbegriff des Anspruchs 1 zugrundeliegenden FR-A-2 463 397 gelöst. Die Vorrichtung umfaßt einen quer oberhalb der Kokille verlaufenden Schneckenförderer mit Austrittsdüsen, aus denen das Gießpulver nur mit Druckluftunterstützung austritt. Die Druckluftunterstützung erfolgt in einem bestimmten zeitlichen Rhythmus oder gesteuert nach dem Fortschritt des Gießstrangs bzw. bei Entdeckung eines Durchbruchs der Schlackenschicht. Der hierfür notwendige Aufwand an Steuerung und Pneumatik ist erheblich und störungsanfällig. Die Druckluftunterstützung geht nicht ohne Staubentwicklung einher.Many of the aforementioned problems are solved in FR-A-2 463 397 on which the preamble of claim 1 is based. The device comprises a screw conveyor running transversely above the mold with outlet nozzles, from which the mold powder emerges only with the aid of compressed air. The compressed air support takes place in a certain time rhythm or controlled according to the progress of the casting strand or when a breakthrough of the slag layer is discovered. The effort required for control and pneumatics is considerable and prone to failure. Compressed air support does not go without creating dust.
Der Erfindung liegt die Aufgabe zugrunde, die gattungsgemäße Vorrichtung so weiterzuentwickeln, daß mit einfacheren Mitteln eine optimale Gießpulverzugabe möglich ist.The invention has for its object to further develop the generic device so that an optimum addition of mold powder is possible with simpler means.
Diese Aufgabe wird durch die in Anspruch 1 wiedergegebenen Merkmale gelöst.This object is achieved by the features set out in claim 1.
Versuche haben gezeigt, daß die zirkulierende Förderung des pulverförmigen Gießhilfsmittels mit fortlaufender Entnahme des jeweils benötigten Anteils oberhalb des Badspiegels eine zuverlässige, von Verstopfungen freie Betriebsweise ermöglicht. Es treten hierbei keine lokalen Druckerhöhungen auf, die zu einer Kompaktierung des pulverförmigen Gießhilfsmittels und zu Verstopfungen Anlaß sein könnten.Experiments have shown that the circulating conveyance of the powdered pouring aid with continuous removal of the required portion above the bath level enables a reliable operation free of blockages. There are no local pressure increases that could cause compacting of the powdered pouring aid and blockages.
Das "Chicken Feeding"-Prinzip erlaubt ohne externe Auslösemittel wie Druckluft auf einfache Weise eine automatische verbrauchsabhängige Dosierung ohne Staubentwicklung.The "Chicken Feeding" principle allows automatic, consumption-based dosing without dust generation in a simple manner without external release agents such as compressed air.
Die Bemessung der Förderleistung auf das Doppelte der Entnahme gewährleistet unter den gegebenen Betriebsbedingungen eine weitghend gleichmäßige Füllung des Schneckenförderers und somit gleichmäßige Verhältnisse an den einzelnen Entnahmestutzen, so daß gleichmäßige Mengen austreten bzw. an den einzelnen Entnahmestutzen die Nachlieferung stets gesichert ist.The dimensioning of the delivery capacity to double the extraction guarantees a largely uniform filling of the screw conveyor under the given operating conditions and thus uniform conditions at the individual extraction nozzles, so that even quantities emerge or the subsequent delivery is always ensured at the individual extraction nozzles.
Die Entnahmestutzen können beispielsweise aus Aluminium bestehen. Sie bilden mit ihrem unteren Rand die Begrenzung der Entnahmestelle, bis zu der der Schüttkegel jeweils aufsteigt. Bei Verschleiß werden die Entnahmestutzen einfach ausgewechselt, ebenso wenn auf eine andere Schüttkegelhöhe übergegangen werden soll, ohne daß der ganze Schneckenförderer in seiner Höhe über der Stranggießkokille verändert werden muß.The extraction nozzle can consist of aluminum, for example. With their lower edge, they form the boundary of the removal point up to which the cone of ascent rises. In the event of wear, the tapping nozzles are simply replaced, as is the case when the cone height is changed should be passed over without the entire screw conveyor having to be changed in its height above the continuous casting mold.
Das "Chicken Feeding"-Prinzip für die Zuführung von Gießhilfsmitteln ist an sich aus der GB-A-2 116 092 bekannt.The "chicken feeding" principle for the feeding of pouring aids is known per se from GB-A-2 116 092.
Da sich der Schneckenförderer quer über den Badspiegel erstreckt, empfiehlt sich gemäß Anspruch 2 eine Kühlung, vorzugsweise mit Luft. Der Badspiegel selbst ist zwar durch das pulverförmige Gießhilfsmittel abgedeckt, doch erstreckt sich in unmittelbarer Nähe des Schneckenförderers das Tauchrohr aus dem Tundish in das obere Ende des Strangs. Dieses Tauchrohr hat Temperaturen in der Größenordnung von 1000o C.Since the screw conveyor extends across the bath level, cooling, preferably with air, is recommended. The bath level itself is covered by the powdered pouring aid, but in the immediate vicinity of the screw conveyor, the dip tube extends from the tundish into the upper end of the strand. This dip tube has temperatures in the order of 1000 o C.
Die Fluidisierung gemäß Anspruch 3 lockert die Menge an pulverförmigem Gießhilfsmittel in dem Vorratsbehälter auf und macht sie quasi fließfähig, so daß sie leicht aus dem Vorratsbehälter in die Förderschnecke übergeht.The fluidization according to claim 3 loosens the amount of powdered pouring aid in the storage container and makes it quasi flowable, so that it easily passes from the storage container into the screw conveyor.
Die Fluidisierung eines Behandlungsmittels für eine Stahlschmelze in einem Behälter ist für sich genommen aus der GB 15 29 099 bekannt.The fluidization of a treatment agent for a molten steel in a container is known per se from
Für die praktische Abwicklung längerer Gießsequenzen empfiehlt es sich, einen Großsilo zur pneumatischen Nachfüllung des Vorratsbehälters vorzusehen, so daß dieser nicht ständig von Hand nachgefüllt werden muß (Anspruch 4).For the practical handling of longer pouring sequences, it is advisable to provide a large silo for the pneumatic refilling of the storage container so that it does not have to be constantly refilled by hand (claim 4).
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung schematisch illustriert.
- Fig. 1 zeigt eine Ansicht der erfindungsgemäßen Zugabevorrichtung;
- Fig. 2 zeigt eine Ansicht einer einzelnen Entnahmestelle oberhalb des Badspiegels.
- Fig. 1 shows a view of the addition device according to the invention;
- Fig. 2 shows a view of a single tapping point above the bath level.
In Fig. 1 ist ein Vorratsbehälter 1 wiedergegeben, der aus einem nur angedeuteten Großsilo 29 über eine pneumatische Förderleitung 2 gefüllt gehalten wird. In dem konischen unteren Teil 3 des Vorratsbehälters 1 sind innen Fluidisierungsböden 4 angebracht, die über Zuleitungen 5 mit Luft beschickt werden und das in dem Vorratsbehälter 1 befindliche Stranggießpulver 6 fluidisieren, d.h. in einen verwirbelten Zustand zersetzen, in welchem es leicht beweglich ist. Das fluidisierte Stranggußpulver 6 strömt aus dem Auslaß 7 am unteren Ende des konischen Teils 3 des Vorratsbehälters 1 über die Leitung 8 in den Einlaß 9 eines horizontalen Schneckenförderers 10, der von einem Antriebsmotor 11 angetrieben ist. Der Schneckenförderer 10 erstreckt sich dicht oberhalb des oberen Endes der Stranggießkokille 12. Er hat nur einen Außendurchmesser von etwa 50 mm und paßt daher noch gut in den engen Zwischenraum zwischen der Oberkante 13 der Stranggießkokille 12 und der Unterseite 14 des oberhalb der Stranggießkokille 12 angeordneten Tundishs 15, der flüssigen Stahl 16 enthält, der über ein Tauchrohr 17 in dem Boden des Tundishs 15 in die Stranggießkokille 12 übergeht. Das Tauchrohr 17 reicht in die in der Stranggießkokille 12 befindliche Schmelze hinein, d.h. erstreckt sich bis unterhalb des Badspiegels 18, der durch geeignete Maßnahmen auf gleichbleibender Höhe gehalten wird.1 shows a storage container 1, which is kept filled from a
An der Unterseite des Schneckenförderers 10 sind Entnahmestellen 19 in Gestalt von einander parallelen Entnahmeschächten 20 vorgesehen, deren untere Begrenzung 21 sich in einem vorbestimmten Abstand oberhalb des Badspiegels 18 befindet, der im allgemeinen bei allen Entnahmeschächten gleich ist.On the underside of the
Der Schneckenförderer 10 umfaßt ein rohrförmiges Gehäuse 22, in welchem eine Transportschnecke 23 drehbar angeordnet ist. An den Entnahmestellen 19 besitzt das Gehäuse 22 Öffnungen 24, an denen die Entnahmeschächte 20 angeschweißt sind. Das von der Transportschnecke 23 an der Öffnung 24 vorbeigeförderte Gut tritt durch die Öffnung 24 nach unten aus und bildet, da es fließfähig ist, einen Schüttkegel 25 aus pulverförmigem Gießhilfsmittel. Wenn der Schüttkegel 25 bis an die untere Begrenzung 21 des Entnahmeschachtes 20 hochgestiegen ist, fließt kein pulverförmiges Gießhilfsmittel 6 mehr nach. Dies tritt aber wieder ein, sobald der Schüttkegel 25 infolge des Aufschmelzens des pulverförmigen Gießhilfsmittels 6 absinkt. Diese Art der Selbstregulierung ist als "Chicken Feeding"-Prinzip bekannt. Es stellt sich ein Gleichgewichtszustand ein, in welchem das Stranggießpulver langsam nach Maßgabe des Verbrauchs nachfließt.The
Auf dem Badspiegel 18 der Schmelze 16 in der Stranggießkokille 12 bildet sich eine gleichmäßige Schicht 26 von geschmolzenem Gießhilfsmittel, d.h. eine Schlacke, aus, die über den Meniskus des Badspiegels 18 von dem Strang zwischen seiner Außenseite und dem Innenumfang der Stranggießkokille 12 mitgenommen wird. Dadurch tritt ein Verbrauch ein, der zu dem Absinken des Schüttkegels 25 Anlaß ist. Es muß dafür gesorgt werden, daß eine gewisse Mindestschütthöhe 27 an pulverförmigem Gießhilfsmittel erhalten bleibt, damit die Wärmeisolationswirkung aufrechterhalten wird.On the
In dem in Fig. 2 wiedergegebenen Ausführungsbeispiel ist die untere Begrenzung der Entnahmestelle 19 nicht an dem Entnahmeschacht 20 selbst ausgebildet, sondern an einem darübergeschobenen Entnahmestutzen 28 beispielsweise aus Aluminium, der ausgewechselt werden kann, wenn sein unteres Ende angeschmolzen ist oder wenn eine andere Höhe des Schüttkegels 25 erwünscht ist.In the embodiment shown in Fig. 2, the lower limit of the
Wesentlich ist, daß sich an dem in Fig. 1 links gelegenen Ende des Schneckenförderers 10 kein Stau bildet, sondern daß die an den Entnahmestellen 19 nicht entnommene Menge an pulverförmigem Gießhilfsmittel über eine Rückleitung 30 in den Vorratsbehälter 1 zurückgeführt wird. Das Gießhilfsmittel 6 zirkuliert also dauernd aus dem Vorratsbehälter 1 über die Leitung 8, den Schneckenförderer 10 und die Rückleitung 30. Nur die an den selbstregulierenden Entnahmestellen 19 jeweils benötigten Mengen werden aus dem zirkulierenden Strom fortlaufend entnommen. Zwar kommt es wegen der Selbstregulierung nach dem "Chicken-Feeding"-Prinzip nicht darauf an, daß der Schneckenförderer 10 von sich aus an allen Entnahmestellen exakt gleich dosiert; diese Dosierung erfolgt an den unteren Begrenzungen 21 der Entnahmeschächte 20, wenn sie von den Schüttkegeln 25 erreicht werden. Der Druck im Innern des Schneckenförderers 10 spielt aber auch eine gewisse Rolle für die Austrittsmengen und sollte daher möglichst konstant sein, was bedeutet, daS der Pulverfüllgrad im Schneckenförderer 10 über dessen gesamte Länge möglichst konstant sein sollte. Erst dadurch ist gewährleistet, daß auch vom Druck her überall weitgehend gleiche Verhältnisse vorliegen, was dazu beiträgt, daß an allen Entnahmestellen 19, unabhängig von ihrer Lage, auch wirklich gleiche Mengen an Pulver ausfließen. Die Konstanz des Pulverfüllgrades ist umso besser, je größer die Förderleistung des Schneckenförderers 10 im Verhältnis zu den entnommenen Mengen ist. Für die Praxis müßte die Förderleistung mindestens das Doppelte dieser Mengen betragen.It is essential that no jam forms at the left end of the
Claims (4)
- Apparatus for the continuous addition of auxiliary casting agents in powder form onto the surface of a melt in a continuous casting mould
with a reservoir container (1) for receiving the casting agent,
with a screw or worm conveyor (10) which is connected to the container (1) and which extends between the underside (14) of a tundish (15) and the upper surface (13) of the continuous casting mould (12)
with a return pipe (30) for the casting agent leading back from the end of the conveyor (10) into the container (1)
and with a number of delivery points (19) above the surface (18) of the melt in the form of delivery chutes (20) connected to the interior of the screw conveyor
characterised in that,
the delivery capacity of the screw conveyor is at least double the delivery from the chutes (20) and
that replaceable delivery spigots or sleeves (28) of a metal which melts at a lower temperature than the metal of the melt are fitted onto the delivery chutes (20) and terminate at a spacing above the surface (18) of the melt which allows self-regulation in accordance with the chicken-feeding principle. - Apparatus according to claim 1, characterised in that the screw conveyor is cooled.
- Apparatus according to claim 1 or 2, characterised in that the reservoir container (1) has a fluidising bed (4,4) for fluidising the powdered casting agent (6) and the conveyor device (10) is connected to the region of the reservoir container (1) in which the casting agent (6) is present in a fludised state.
- Apparatus according to one of claims 1 to 3, characterised in that a bulk silo (29) is provided for pneumatically replenishing the reservoir container (1).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4022117A DE4022117A1 (en) | 1990-07-11 | 1990-07-11 | METHOD AND DEVICE FOR THE CONTINUOUS ADMINISTRATION OF POURING AUXILIARIES ON THE MIRROR OF A MELT IN A CONTINUOUS MOLD |
| DE4022117 | 1990-07-11 | ||
| PCT/DE1991/000398 WO1992000819A1 (en) | 1990-07-11 | 1991-05-17 | Process and device for the continuous addition of casting agents to the surface of a melt in a continuous casting die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0538265A1 EP0538265A1 (en) | 1993-04-28 |
| EP0538265B1 true EP0538265B1 (en) | 1995-03-08 |
Family
ID=6410101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91909146A Expired - Lifetime EP0538265B1 (en) | 1990-07-11 | 1991-05-17 | Device for the continuous addition of casting agents to the surface of a melt in a continuous casting die |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US5311921A (en) |
| EP (1) | EP0538265B1 (en) |
| JP (1) | JP2609389B2 (en) |
| AT (1) | ATE119442T1 (en) |
| AU (1) | AU643028B2 (en) |
| CZ (1) | CZ280158B6 (en) |
| DE (2) | DE4022117A1 (en) |
| DK (1) | DK0538265T3 (en) |
| ES (1) | ES2069293T3 (en) |
| FI (1) | FI95546C (en) |
| HU (3) | HUT62219A (en) |
| PL (1) | PL168749B1 (en) |
| SK (1) | SK283875B6 (en) |
| WO (1) | WO1992000819A1 (en) |
| ZA (1) | ZA915409B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9304946U1 (en) * | 1993-04-01 | 1994-08-04 | Intocast GmbH Feuerfestprodukte und Gießhilfsmittel, 4030 Ratingen | Device for the continuous addition of powdered casting aids to the bath level of a melt in a continuous casting mold |
| US5622218A (en) * | 1995-05-15 | 1997-04-22 | Hylsa S.A. De C.V. | Method and apparatus for continuous casting of steel materials |
| AT403555B (en) * | 1996-04-16 | 1998-03-25 | Voest Alpine Stahl Donawitz | Method and apparatus for feeding casting powder onto the melt surface during continuous casting |
| WO1997043065A1 (en) * | 1996-05-10 | 1997-11-20 | Mannesmann Ag | Continuous casting plant for billets |
| DE19650587C2 (en) * | 1996-12-06 | 1999-01-21 | Thyssen Stahl Ag | Device for casting a molten metal and device for distributing mold powder |
| DE19748948C2 (en) * | 1997-10-24 | 2000-10-12 | Mannesmann Ag | Device for adding casting powder to continuous casting plants |
| DE19956059C2 (en) * | 1999-11-22 | 2002-03-14 | E S C H Engineering Service Ct | Process for supplying mold powder to a continuous casting mold |
| DE102007046261B3 (en) * | 2007-09-26 | 2009-04-30 | Mbl-Europe Gmbh | Distributor for granular casting flux, comprises a connector connecting with a supply line, and pipeline sections, which guide from the connector in different directions, where each pipeline section has discharge openings and vent opening |
| DE102007050679A1 (en) | 2007-10-21 | 2009-04-23 | Voxeljet Technology Gmbh | Method and device for conveying particulate material in the layered construction of models |
| DE102010056346A1 (en) | 2010-12-29 | 2012-07-05 | Technische Universität München | Method for the layered construction of models |
| WO2013017251A1 (en) * | 2011-08-02 | 2013-02-07 | Tata Steel Nederland Technology B.V. | Supply nozzle for powder or granular material |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4116367A (en) * | 1975-11-12 | 1978-09-26 | Nippon Steel Corporation | Apparatus for supplying powder to continuous casting mold |
| CH595161A5 (en) * | 1975-11-27 | 1978-01-31 | Concast Ag | |
| FR2463397A1 (en) * | 1979-08-09 | 1981-02-20 | Poncet Pierre | Automatic slag powder distributor for continuous casting moulds - where screw feeders drive powder through outlet nozzles aligned above mould |
| JPS5725448A (en) * | 1980-07-22 | 1982-02-10 | Teijin Ltd | High bulky knitted fabric |
| FR2522551A1 (en) * | 1982-03-05 | 1983-09-09 | Lorraine Laminage | METHOD AND DEVICE FOR SUPPLYING AND REGULATING THE LUBRICATING POWDER LAYER IN A CONTINUOUS CASTING LINGOTIERE |
| JPS61199560A (en) * | 1985-02-28 | 1986-09-04 | Nippon Kokan Kk <Nkk> | Air sliding type mold powder supplying device |
| JPS6286950U (en) * | 1985-11-14 | 1987-06-03 | ||
| JPS63123555A (en) * | 1986-11-14 | 1988-05-27 | Nippon Steel Corp | Method and apparatus for supplying powder for continuous casting |
-
1990
- 1990-07-11 DE DE4022117A patent/DE4022117A1/en active Granted
-
1991
- 1991-05-17 DK DK91909146.2T patent/DK0538265T3/en active
- 1991-05-17 US US07/966,058 patent/US5311921A/en not_active Expired - Fee Related
- 1991-05-17 HU HU923385A patent/HUT62219A/en unknown
- 1991-05-17 EP EP91909146A patent/EP0538265B1/en not_active Expired - Lifetime
- 1991-05-17 JP JP3508720A patent/JP2609389B2/en not_active Expired - Lifetime
- 1991-05-17 ES ES91909146T patent/ES2069293T3/en not_active Expired - Lifetime
- 1991-05-17 DE DE59104907T patent/DE59104907D1/en not_active Expired - Fee Related
- 1991-05-17 HU HU9203385A patent/HU214894B/en not_active IP Right Cessation
- 1991-05-17 AT AT91909146T patent/ATE119442T1/en not_active IP Right Cessation
- 1991-05-17 PL PL91297598A patent/PL168749B1/en not_active IP Right Cessation
- 1991-05-17 WO PCT/DE1991/000398 patent/WO1992000819A1/en active IP Right Grant
- 1991-05-17 HU HU923385Q patent/HU9203385D0/en unknown
- 1991-05-17 AU AU78560/91A patent/AU643028B2/en not_active Ceased
- 1991-07-10 SK SK2136-91A patent/SK283875B6/en unknown
- 1991-07-10 CZ CS912136A patent/CZ280158B6/en not_active IP Right Cessation
- 1991-07-11 ZA ZA915409A patent/ZA915409B/en unknown
-
1993
- 1993-01-08 FI FI930059A patent/FI95546C/en active
Also Published As
| Publication number | Publication date |
|---|---|
| PL297598A1 (en) | 1992-07-13 |
| HU9203385D0 (en) | 1993-03-01 |
| FI95546B (en) | 1995-11-15 |
| HUT62219A (en) | 1993-04-28 |
| SK283875B6 (en) | 2004-04-06 |
| DE4022117A1 (en) | 1992-01-16 |
| HU214894B (en) | 1998-07-28 |
| JP2609389B2 (en) | 1997-05-14 |
| AU7856091A (en) | 1992-02-04 |
| EP0538265A1 (en) | 1993-04-28 |
| WO1992000819A1 (en) | 1992-01-23 |
| PL168749B1 (en) | 1996-04-30 |
| AU643028B2 (en) | 1993-11-04 |
| ZA915409B (en) | 1992-04-29 |
| JPH05507442A (en) | 1993-10-28 |
| FI930059A (en) | 1993-01-08 |
| DK0538265T3 (en) | 1995-05-22 |
| CS213691A3 (en) | 1992-02-19 |
| DE4022117C2 (en) | 1992-07-02 |
| CZ280158B6 (en) | 1995-11-15 |
| US5311921A (en) | 1994-05-17 |
| ATE119442T1 (en) | 1995-03-15 |
| ES2069293T3 (en) | 1995-05-01 |
| DE59104907D1 (en) | 1995-04-13 |
| FI930059A0 (en) | 1993-01-08 |
| FI95546C (en) | 1996-02-26 |
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