EP0439760A1 - Device for supporting heat-treated products in a reheating furnace - Google Patents

Device for supporting heat-treated products in a reheating furnace Download PDF

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Publication number
EP0439760A1
EP0439760A1 EP90124217A EP90124217A EP0439760A1 EP 0439760 A1 EP0439760 A1 EP 0439760A1 EP 90124217 A EP90124217 A EP 90124217A EP 90124217 A EP90124217 A EP 90124217A EP 0439760 A1 EP0439760 A1 EP 0439760A1
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EP
European Patent Office
Prior art keywords
housing
support tube
support
support piece
longitudinal direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90124217A
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German (de)
French (fr)
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EP0439760B1 (en
Inventor
Helmut Dipl.-Ing. Heuss
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Loi Essen Industrieofenanlagen GmbH
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Loi Essen Industrieofenanlagen GmbH
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Publication of EP0439760A1 publication Critical patent/EP0439760A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/022—Skids
    • F27D3/024—Details of skids, e.g. riders

Definitions

  • the invention relates to a device for supporting heat treatment material, in particular slabs, billets, blocks and the like.
  • the tab consists of a high-temperature-resistant casting.
  • This material is resilient up to approx. 1200 ° C and has excellent strength properties in this area. Above 1200 ° C, however, the strength properties no longer meet the usual requirements.
  • the heating of the heat treatment material can be 50 to 100 ° C higher, especially when heating slabs and the like, which are then to be rolled. Since the known tabs must be kept below this temperature, they necessarily create so-called rail shadows in the heat treatment material.
  • the rail shadows are zones of lower temperature which cause quality losses (thickness and width deviations as well as changes in the grain structure) of the end product, unless complex additional measures are taken to remove the rail shadows before the rolling process begins. The importance of these disadvantages is increasing as the quality requirements are constantly increasing.
  • the object of the invention is to create a device of the type mentioned at the outset which enables extremely uniform heating of the heat treatment material, and this under the most favorable conditions in terms of production and operation.
  • the device according to the invention is characterized in that the rider has a housing placed on the support tube and detachably connected to it made of heat-resistant cast that the housing is provided with at least one open top recess, which is dovetail-shaped in the longitudinal direction of the support tube and is delimited on the end side by a front wall on the one hand and by a bolt on the other, and that in the recess of the housing an essentially from ceramic material existing support is used, which forms a support surface for the heat treatment material with its upper part and is dovetailed in its lower part in the longitudinal direction of the support tube.
  • the tab according to the invention uses the good strength properties of the highly heat-resistant casting at temperatures below 1200 ° C and combines them with the excellent compressive strength properties of ceramic materials above 1200 ° C.
  • the housing made of highly heat-resistant cast iron protects the ceramic support piece and introduces the occurring forces into the support tube through which coolant flows.
  • the support piece is only subjected to pressure and can withstand this stress even at those temperatures that are required for heating the heat treatment material.
  • the supporting piece and the material to be treated are therefore at the same temperature, so that no rail shadows can occur. The result is an extremely even heating of the heat treatment material. In this way, end products of excellent quality can be produced.
  • Any ceramic including metal-ceramic materials, possibly in combination with other materials, which have the desired compressive strength at high temperatures, can be used as the material for the support piece.
  • the manufacturing costs for the device according to the invention are normal.
  • the stability is above average well, on the one hand due to the choice of material according to the invention, and on the other hand because of the favorable thermal behavior of the construction, which allows thermal expansion without further ado. Maintenance is low because the loosely attached riders can be easily replaced.
  • the housing offers the ceramic support a very good support that promotes cohesion.
  • the dovetail-shaped interlocking of the two parts of the rider ensures that the ceramic support piece cannot be pulled up out of the housing.
  • the support piece is inserted into the housing in the longitudinal direction and then fixed by the bolt.
  • the latter is welded in. It can also be detachably fastened if an exchange of the support piece is important.
  • the arrangement is preferably made so that the end wall of the housing is downstream of the direction of transport of the heat treatment material.
  • end wall of the housing is rounded transversely to the longitudinal direction of the support tube.
  • a gap is formed between the support piece and the recess of the housing, or the like with ceramic fibers, mortar. is filled out. This results in very good power transmission ratios, combined with minimizing the heat losses in the direction of the cooled support tube. Manufacturing tolerances and uneven areas can also be compensated for.
  • the upper part of the support piece can be rounded according to the invention transversely to the longitudinal direction of the support tube, preferably mushroom-shaped. In the latter case, it overlaps the recess in the housing and thus prevents entry of foreign substances.
  • the invention proposes that the upper part of the support piece forms a continuation of the dovetail-shaped lower part up to the upper bearing surface.
  • the wing can also be rounded here. You get a particularly simple shape.
  • Another advantageous feature of the invention is that the housing engages over a projection of the support tube and that a bolt is inserted transversely to the longitudinal direction of the support tube through its projection and through the housing.
  • the device according to the invention can further be characterized in that the housing surrounds the upper region of the support tube and adjoins an insulation surrounding the rest of the support tube.
  • the tab is therefore very well integrated into the overall structure of the device, which can be further promoted by the fact that gap spaces are formed between the housing and the insulation, which are filled with ceramic fibers.
  • the device according to Figures 1 and 2 comprises a support tube 1 which is arranged in the longitudinal direction of the furnace.
  • the direction of transport of the heat treatment material results from an arrow 2 in FIG. 1.
  • a cooling medium such as steam or water, flows through the support tube 1 to cool it.
  • a plurality of riders 3 are arranged on the support tube 1.
  • Each rider 3 has a housing 4 which surrounds a projection 5 welded to the support tube 1.
  • a bolt 6 is inserted through the housing 4 and the projection 5 and prevents the housing from being lifted up by the goods to be transported.
  • the connection is detachable and therefore enables easy assembly and disassembly.
  • the housing 4 engages around the upper region of the support tube 1 and connects to an insulation 7, which surrounds the remaining circumference of the support tube. Gaps 8 are formed between the housing 4 and the insulation 7 and are filled with ceramic fibers. Overall, the cooled support tube 1 is well shielded from the heated furnace chamber.
  • the housing 4 forms an upwardly open recess 9, into which a support piece 10 made of ceramic material is inserted.
  • the support piece 10 forms a support surface 11 for the heat treatment material.
  • the device according to the exemplary embodiment is intended for a walking beam furnace for heating slabs which are then to be rolled.
  • the heating temperature is around 1300 ° C.
  • the ceramic support piece is readily able to withstand this temperature and to provide sufficient pressure resistance.
  • the transmission of the occurring loads on the support tube 1 takes place via the housing 4, which consists of highly heat-resistant cast.
  • the housing 4 is kept at a temperature just below 1200 ° C. by the cooled support tube 1. It has excellent strength properties at this temperature.
  • the tab 3 consisting of the housing 4 and the support piece 11 offers the possibility of the heat treatment material very uniformly, i.e. without heating the rail shadow.
  • the tab 3 optimally combines the high temperature resistance of the ceramic material with the strength properties of the cast steel given at a lower temperature.
  • a gap 12 is formed between the housing 4 and the support piece 10, which is filled with ceramic fibers in the present case. These form additional heat insulation and are used primarily to support the support piece 10, to ensure a favorable transfer of force from the support piece to the housing 4 and to compensate for manufacturing tolerances between the support piece 10 and the housing 4.
  • the recess 9 of the housing 4 seen in the longitudinal direction of the support tube 1 is dovetail-shaped.
  • the support piece 10 has a complementary shape that extends up to the bearing surface 11. In the longitudinal direction, the recess 9 is delimited on the one hand by a rounded end wall 13 and on the other hand by a bolt 14.
  • the bolt 14 is welded to the housing 4. The arrangement is such that the support piece 10 can be inserted into the recess 9 in the longitudinal direction, whereupon the gap 12 is filled with the ceramic fiber and the bolt 14 is fastened.
  • the support piece 10 is held securely in this way, and also against being pulled upwards by the migrating heat treatment material.
  • the construction is simple to manufacture and easy to assemble.
  • the cross-sectional configuration of the support piece can deviate from the shape shown in FIG. 2, as long as it is ensured that the heat treatment material is supported at a sufficient distance above the housing 4.
  • FIG. 3 shows a mushroom-shaped design of the support piece 10.
  • the support piece engages over the side walls of the housing 4 and thus forms a shield against the entry of dirt and other foreign particles.
  • the upper part of the support piece 10 is rounded in cross section. As a result, the contact area between the support piece and the heat treatment material is reduced to a minimum.
  • the invention has its main advantages where the temperature conditions specified above prevail. In contrast, the invention can also be used under other conditions. Furthermore, it is not limited to use in walking beam furnaces, but can also be used, for example, in step-by-step furnaces and above all in push furnaces.
  • the support pieces 10 of the embodiments according to FIGS. 2 and 3 can also have a rounded support surface 11, as can be seen in FIG. 4.
  • the latch 14 according to FIG. 1 can be detachably connected to the housing 4, for example inserted, in order to facilitate an exchange of the support piece 10.
  • Mortar can also be introduced into the gap 12 between the support piece 10 and the housing 4 instead of the ceramic fibers.
  • the arrangement according to FIG. 1 can be reversed in such a way that the end wall 13 moves to the rear and the latch 14 moves to the front.
  • the projection 5 is then preferably also implemented. Otherwise, this projection 5 can also be arranged laterally. Especially under this condition, you will choose a different lock instead of the bolt 6.
  • each housing can also accommodate a plurality of support pieces.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Tunnel Furnaces (AREA)

Abstract

The device has at least one support pipe (1) flowed through by coolant, on which at least one rider (3) is located. The latter consists of a housing (4) made of heat-resistant cast iron with at least one recess (9), into which a support piece (10) made of ceramic material is inserted. The support piece has adequate compression strength even at temperatures above 1200 DEG C. The housing remains at a temperature below 1200 DEG C and can in this region support and hold together the support piece very well and moreover conduct the stresses arising into the support pipe. The housing (4) is connected detachably to the support pipe (1) by means of a bolt (6). <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung zum Abstützen von Wärmebehandlungsgut, insbesondere von Brammen, Knüppeln, Blöcken u.dgl., in einem Erwärmungsofen, insbesondere in einem Hubbalkenofen, mit mindestens einem kühlmitteldurchströmten Tragrohr und mindestens einem auf dem Tragrohr angeordneten, hochtemperaturfesten Reiter.The invention relates to a device for supporting heat treatment material, in particular slabs, billets, blocks and the like.

Bei derartigen Vorrichtungen, wie sie aus der EP 0 184 021 B1 bekannt sind, besteht der Reiter aus einem hochtemperaturfesten Gußstück. Dieses Material ist bis ca. 1200°C belastbar und besitzt in diesem Bereich vorzügliche Festigkeitseigenschaften. Oberhalb von 1200°C allerdings genügen die Festigkeitseigenschaften nicht mehr den üblichen Anforderungen. Die Erwärmung des Wärmebehandlungsgutes hingegen kann 50 bis 100°C höher liegen, insbesondere bei der Erwärmung von Brammen u.dgl., die anschließend gewalzt werden sollen. Da die bekannten Reiter unterhalb dieser Temperatur gehalten werden müssen, erzeugen sie notwendigerweise sogenannte Schienenschatten im Wärmebehandlungsgut. Bei den Schienenschatten handelt es sich um Zonen niedrigerer Temperatur, die Qualitätsminderungen (Dicken- und Breitenabweichungen sowie Änderungen in der Kornstruktur) des Endproduktes hervorrufen, sofern nicht aufwendige zusätzliche Maßnahmen ergriffen werden, um die Schienenschatten vor Beginn des Walzvorganges zu beseitigen. Die Bedeutung dieser Nachteile nimmt zu, da die Qualitätsanforderungen ständig ansteigen.In such devices, as are known from EP 0 184 021 B1, the tab consists of a high-temperature-resistant casting. This material is resilient up to approx. 1200 ° C and has excellent strength properties in this area. Above 1200 ° C, however, the strength properties no longer meet the usual requirements. The heating of the heat treatment material, however, can be 50 to 100 ° C higher, especially when heating slabs and the like, which are then to be rolled. Since the known tabs must be kept below this temperature, they necessarily create so-called rail shadows in the heat treatment material. The rail shadows are zones of lower temperature which cause quality losses (thickness and width deviations as well as changes in the grain structure) of the end product, unless complex additional measures are taken to remove the rail shadows before the rolling process begins. The importance of these disadvantages is increasing as the quality requirements are constantly increasing.

Dementsprechend liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art zu schaffen, die eine extrem gleichmäßige Erwärmung des Wärmebehandlungsgutes ermöglicht, und zwar unter fertigungs- und betriebstechnisch günstigsten Voraussetzungen.Accordingly, the object of the invention is to create a device of the type mentioned at the outset which enables extremely uniform heating of the heat treatment material, and this under the most favorable conditions in terms of production and operation.

Zur Lösung dieser Aufgabe ist die Vorrichtung nach der Erfindung dadurch gekennzeichnet, daß der Reiter ein auf das Tragrohr aufgesetztes und mit diesem lösbar verbundenes Gehäuse aus hitzebeständigem Guß aufweist, daß das Gehäuse mit mindestens einer oben offenen Ausnehmung versehen ist, die in Längsrichtung des Tragrohres schwalbenschwanzförmig ausgebildet ist und stirnseitig einerseits von einer Stirnwand und andererseits von einem Riegel begrenzt wird, und daß in die Ausnehmung des Gehäuses ein im wesentlichen aus keramischem Material bestehendes Tragstück eingesetzt ist, das mit seinem oberen Teil eine Auflagefläche für das Wärmebehandlungsgut bildet und in seinem unteren Teil in Längsrichtung des Tragrohres schwalbenschwanzförmig ausgebildet ist.To achieve this object, the device according to the invention is characterized in that the rider has a housing placed on the support tube and detachably connected to it made of heat-resistant cast that the housing is provided with at least one open top recess, which is dovetail-shaped in the longitudinal direction of the support tube and is delimited on the end side by a front wall on the one hand and by a bolt on the other, and that in the recess of the housing an essentially from ceramic material existing support is used, which forms a support surface for the heat treatment material with its upper part and is dovetailed in its lower part in the longitudinal direction of the support tube.

Der Reiter nach der Erfindung nutzt die guten Festigkeitseigenschaften des hochhitzebeständigen Gusses bei Temperaturen unter 1200°C und kombiniert sie mit den hervorragenden Druckfestigkeitseigenschaften keramischer Materialien über 1200°C. Das Gehäuse aus hochhitzebeständigem Guß schützt das keramische Tragstück und leitet die auftretenden Kräfte in das kühlmitteldurchströmte Tragrohr ein. Das Tragstück wird nur auf Druck beansprucht und kann dieser Beanspruchung auch bei denjenigen Temperaturen standhalten, die für die Erwärmung des Wärmebehandlungsgutes erforderlich sind. Tragstück und Wärmebehandlungsgut befinden sich also auf gleicher Temperatur, so daß keine Schienenschatten auftreten können. Eine extrem gleichmäßige Erwärmung des Wärmebehandlungsgutes ist die Folge. Auf diese Weise lassen sich Endprodukte von ausgezeichneter Qualität herstellen.The tab according to the invention uses the good strength properties of the highly heat-resistant casting at temperatures below 1200 ° C and combines them with the excellent compressive strength properties of ceramic materials above 1200 ° C. The housing made of highly heat-resistant cast iron protects the ceramic support piece and introduces the occurring forces into the support tube through which coolant flows. The support piece is only subjected to pressure and can withstand this stress even at those temperatures that are required for heating the heat treatment material. The supporting piece and the material to be treated are therefore at the same temperature, so that no rail shadows can occur. The result is an extremely even heating of the heat treatment material. In this way, end products of excellent quality can be produced.

Als Material für das Tragstück kommen beliebige keramische, auch metall-keramische Werkstoffe, ggf. in Kombination mit anderen Werkstoffen in Frage, die die gewünschte Druckfestigkeit bei hohen Temperaturen besitzen.Any ceramic, including metal-ceramic materials, possibly in combination with other materials, which have the desired compressive strength at high temperatures, can be used as the material for the support piece.

Die Fertigungskosten für die Vorrichtung nach der Erfindung liegen im normalen Rahmen. Die Standfestigkeit ist überdurchschnittlich gut, zum einen aufgrund der erfindungsgemäßen Materialwahl, zum anderen wegen des günstigen thermischen Verhaltens der Konstruktion, die Wärmedehnungen ohne weiteres zuläßt. Der Wartungsaufwand ist gering, da die lose aufgesetzten Reiter ohne weiteres ausgetauscht werden können.The manufacturing costs for the device according to the invention are normal. The stability is above average well, on the one hand due to the choice of material according to the invention, and on the other hand because of the favorable thermal behavior of the construction, which allows thermal expansion without further ado. Maintenance is low because the loosely attached riders can be easily replaced.

Das Gehäuse bietet dem keramischen Tragstück eine sehr gute, den Zusammenhalt fördernde Stütze. Dabei sorgt das schwalbenschwanzförmige Ineinandergreifen der beiden Teile des Reiters dafür, daß das keramische Tragstück nicht nach oben aus dem Gehäuse herausgezogen werden kann. Bei der Montage wird das Tragstück in Längsrichtung in das Gehäuse eingeschoben und sodann durch den Riegel festgelegt. Letzterer wird eingeschweißt. Er kann auch lösbar befestigt sein, wenn auf einen Austausch des Tragstückes Wert gelegt wird. Die Anordnung wird vorzugsweise so getroffen, daß sich die Stirnwand des Gehäuses stromab zur Transportrichtung des Wärmebehandlungsgutes befindet.The housing offers the ceramic support a very good support that promotes cohesion. The dovetail-shaped interlocking of the two parts of the rider ensures that the ceramic support piece cannot be pulled up out of the housing. During assembly, the support piece is inserted into the housing in the longitudinal direction and then fixed by the bolt. The latter is welded in. It can also be detachably fastened if an exchange of the support piece is important. The arrangement is preferably made so that the end wall of the housing is downstream of the direction of transport of the heat treatment material.

Ferner ist es vorteilhaft, daß die Stirnwand des Gehäuses quer zur Längsrichtung des Tragrohres gerundet ist.It is also advantageous that the end wall of the housing is rounded transversely to the longitudinal direction of the support tube.

Zwischen dem Tragstück und der Ausnehmung des Gehäuses wird erfindungsgemäß ein Spaltraum gebildet, der mit Keramikfasern, Mörtel o.dgl. ausgefüllt ist. Dadurch ergeben sich sehr gute Kraftübertragungsverhältnisse, verbunden mit einer Minimierung der Wärmeverluste in Richtung auf das gekühlte Tragrohr. Auch können Herstellungstoleranzen und Flächenunebenheiten ausgeglichen werden.According to the invention, a gap is formed between the support piece and the recess of the housing, or the like with ceramic fibers, mortar. is filled out. This results in very good power transmission ratios, combined with minimizing the heat losses in the direction of the cooled support tube. Manufacturing tolerances and uneven areas can also be compensated for.

Der obere Teil des Tragstückes kann quer zur Längsrichtung des Tragrohres erfindungsgemäß gerundet ausgebildet sein, und zwar vorzugsweise pilzförmig. Im letztgenannten Fall übergreift er die Ausnehmung des Gehäuses und verhindert damit den Eintritt von Fremdstoffen.The upper part of the support piece can be rounded according to the invention transversely to the longitudinal direction of the support tube, preferably mushroom-shaped. In the latter case, it overlaps the recess in the housing and thus prevents entry of foreign substances.

Als alternative Gestaltung schlägt die Erfindung vor, daß der obere Teil des Tragstücks bis zur oberen Auflagefläche seiner Form nach eine Fortsetzung des schwalbenschwanzförmigen unteren Teils bildet. Auch hier kann die Tragfläche gerundet sein. Man erhält eine ganz besonders einfache Formgebung.As an alternative design, the invention proposes that the upper part of the support piece forms a continuation of the dovetail-shaped lower part up to the upper bearing surface. The wing can also be rounded here. You get a particularly simple shape.

Ein weiteres vorteilhaftes Merkmal der Erfindung besteht darin, daß das Gehäuse einen Vorsprung des Tragrohres übergreift und daß ein Bolzen quer zur Längsrichtung des Tragrohres durch dessen Vorsprung und durch das Gehäuse hindurchgesteckt ist. Bei einfacher Konstruktion ergibt sich ein sehr leichter Austausch des kompletten Reiters, ohne das Trenn- oder Schweißarbeiten erforderlich wären.Another advantageous feature of the invention is that the housing engages over a projection of the support tube and that a bolt is inserted transversely to the longitudinal direction of the support tube through its projection and through the housing. With a simple construction, the entire rider can be replaced very easily, without the need for cutting or welding work.

Die Vorrichtung nach der Erfindung kann ferner dadurch gekennzeichnet sein, daß das Gehäuse den oberen Bereich des Tragrohres umgreift und sich an eine den Rest des Tragrohres umgebende Isolierung anschließt. Der Reiter wird also sehr gut in den Gesamtaufbau der Vorrichtung integriert, was noch dadurch gefördert werden kann, daß zwischen dem Gehäuse und der Isolierung Spalträume gebildet werden, die mit Keramikfasern ausgefüllt sind.The device according to the invention can further be characterized in that the housing surrounds the upper region of the support tube and adjoins an insulation surrounding the rest of the support tube. The tab is therefore very well integrated into the overall structure of the device, which can be further promoted by the fact that gap spaces are formed between the housing and the insulation, which are filled with ceramic fibers.

Als erfindungswesentlich offenbart gelten auch solche Kombinationen der erfindungsgemäßen Merkmale, die von den obigen Verknüpfungen abweichen.Combinations of the features according to the invention that deviate from the above connections are also considered to be disclosed as essential to the invention.

Die Erfindung wird im folgenden anhand bevorzugter Ausführungsbeispiele im Zusammenhang mit der beiliegenden Zeichnung näher erläutert. Die Zeichnung zeigt in:

Fig. 1
einen Vertikalschnitt durch eine Vorrichtung nach der Erfindung entlang der Linie I-I in Fig. 2;
Fig. 2
einen Vertikalschnitt entlang der Linie II-II in Fig. 1;
Fig. 3
einen Schnitt entsprechend Fig. 2 durch eine abgewandelte Ausführungsform;
Fig. 4
einen Schnitt entsprechend Fig. 2 und 3 durch eine weitere abgewandelte Ausführungsform.
The invention is explained in more detail below on the basis of preferred exemplary embodiments in conjunction with the accompanying drawing. The drawing shows in:
Fig. 1
a vertical section through a device according to the invention along the line II in Fig. 2;
Fig. 2
a vertical section along the line II-II in Fig. 1;
Fig. 3
a section corresponding to Figure 2 through a modified embodiment.
Fig. 4
a section corresponding to FIGS. 2 and 3 through a further modified embodiment.

Die Vorrichtung nach den Figuren 1 und 2 umfaßt ein Tragrohr 1, welches in Ofenlängsrichtung angeordnet ist. Die Transportrichtung des Wärmebehandlungsgutes ergibt sich aus einem Pfeil 2 in Fig. 1. Das Tragrohr 1 wird zu seiner Kühlung von einem Kühlmedium, wie Dampf oder Wasser, durchströmt.The device according to Figures 1 and 2 comprises a support tube 1 which is arranged in the longitudinal direction of the furnace. The direction of transport of the heat treatment material results from an arrow 2 in FIG. 1. A cooling medium, such as steam or water, flows through the support tube 1 to cool it.

Auf dem Tragrohr 1 ist eine Mehrzahl von Reitern 3 angeordnet. Jeder Reiter 3 weist ein Gehäuse 4 auf, welches einen mit dem Tragrohr 1 verschweißten Vorsprung 5 umgreift. Ein Bolzen 6 ist durch das Gehäuse 4 und den Vorsprung 5 hindurchgesteckt und verhindert, daß das Gehäuse durch das Transportgut abgehoben wird. Die Verbindung ist lösbar und ermöglicht daher eine leichte Montage und Demontage.A plurality of riders 3 are arranged on the support tube 1. Each rider 3 has a housing 4 which surrounds a projection 5 welded to the support tube 1. A bolt 6 is inserted through the housing 4 and the projection 5 and prevents the housing from being lifted up by the goods to be transported. The connection is detachable and therefore enables easy assembly and disassembly.

Wie aus Fig. 2 zu ersehen, umgreift das Gehäuse 4 den oberen Bereich des Tragrohrs 1 und schließt sich an eine Isolierung 7 an, die den restlichen Umfang des Tragrohres umgibt. Zwischen dem Gehäuse 4 und der Isolierung 7 bilden sich Spalträume 8, die mit Keramikfasern ausgefüllt sind. Insgesamt ergibt sich eine gute Abschirmung des gekühlten Tragrohrs 1 gegenüber dem beheizten Ofenraum.As can be seen from FIG. 2, the housing 4 engages around the upper region of the support tube 1 and connects to an insulation 7, which surrounds the remaining circumference of the support tube. Gaps 8 are formed between the housing 4 and the insulation 7 and are filled with ceramic fibers. Overall, the cooled support tube 1 is well shielded from the heated furnace chamber.

Das Gehäuse 4 bildet eine nach oben offene Ausnehmung 9, in die ein Tragstück 10 aus keramischem Material eingesetzt ist. Das Tragstück 10 bildet eine Auflagefläche 11 für das Wärmebehandlungsgut.The housing 4 forms an upwardly open recess 9, into which a support piece 10 made of ceramic material is inserted. The support piece 10 forms a support surface 11 for the heat treatment material.

Die Vorrichtung nach dem Ausführungsbeispiel ist für einen Hubbalkenofen zur Erwärmung von Brammen bestimmt, welche anschließend gewalzt werden sollen. Die Erwärmungstemperatur liegt bei ca. 1300°C. Das keramische Tragstück ist ohne weiteres in der Lage, dieser Temperatur standzuhalten und eine ausreichende Druckfestigkeit zur Verfügung zu stellen. Die Übertragung der auftretenden Belastungen auf das Tragrohr 1 erfolgt über das Gehäuse 4, welches aus hochhitzebeständigem Guß besteht. Das Gehäuse 4 wird durch das gekühlte Tragrohr 1 auf einer Temperatur knapp unter 1200°C gehalten. Es besitzt bei dieser Temperatur hervorragende Festigkeitseigenschaften. Insgesamt bietet der aus dem Gehäuse 4 und dem Tragstück 11 bestehende Reiter 3 die Möglichkeit, das Wärmebehandlungsgut sehr gleichmäßig, d.h. ohne Schienenschatten zu erwärmen. Der Reiter 3 kombiniert in optimaler Weise die hohe Temperaturfestigkeit des keramischen Materials mit den bei niedrigerer Temperatur gegebenen Festigkeitseigenschaften des Stahlgusses.The device according to the exemplary embodiment is intended for a walking beam furnace for heating slabs which are then to be rolled. The heating temperature is around 1300 ° C. The ceramic support piece is readily able to withstand this temperature and to provide sufficient pressure resistance. The transmission of the occurring loads on the support tube 1 takes place via the housing 4, which consists of highly heat-resistant cast. The housing 4 is kept at a temperature just below 1200 ° C. by the cooled support tube 1. It has excellent strength properties at this temperature. Overall, the tab 3 consisting of the housing 4 and the support piece 11 offers the possibility of the heat treatment material very uniformly, i.e. without heating the rail shadow. The tab 3 optimally combines the high temperature resistance of the ceramic material with the strength properties of the cast steel given at a lower temperature.

Zwischen dem Gehäuse 4 und dem Tragstück 10 bildet sich ein Spaltraum 12, der im vorliegenden Fall mit Keramikfasern ausgefüllt ist. Diese bilden eine zusätzliche Wärmeisolierung und dienen vor allem dazu, das Tragstück 10 zu stützen, einen günstigen Kraftübergang vom Tragstück auf das Gehäuse 4 sicherzustellen und Herstellungstoleranzen zwischen Tragstück 10 und Gehäuse 4 auszugleichen.A gap 12 is formed between the housing 4 and the support piece 10, which is filled with ceramic fibers in the present case. These form additional heat insulation and are used primarily to support the support piece 10, to ensure a favorable transfer of force from the support piece to the housing 4 and to compensate for manufacturing tolerances between the support piece 10 and the housing 4.

Gemäß Fig. 2 ist die Ausnehmung 9 des Gehäuses 4, gesehen in Längsrichtung des Tragrohres 1, schwalbenschwanzförmig ausgebildet. Das Tragstück 10 besitzt eine komplementäre Form, die sich bis zur Auflagefläche 11 erstreckt. In Längsrichtung wird die Ausnehmung 9 einerseits von einer gerundeten Stirnwand 13 und andererseits von einem Riegel 14 begrenzt. Der Riegel 14 ist mit dem Gehäuse 4 verschweißt. Die Anordnung ist so getroffen, daß das Tragstück 10 in Längsrichtung in die Ausnehmung 9 eingeschoben werden kann, woraufhin man den Spaltraum 12 mit den Keramikfaser ausfüllt und den Riegel 14 befestigt. Das Tragstück 10 wird auf diese Weise sicher gehalten, und zwar auch gegen ein Herausziehen nach oben durch das wandernde Wärmebehandlungsgut. Dabei ist die Konstruktion einfach in der Fertigung und problemlos in der Montage.2, the recess 9 of the housing 4, seen in the longitudinal direction of the support tube 1, is dovetail-shaped. The support piece 10 has a complementary shape that extends up to the bearing surface 11. In the longitudinal direction, the recess 9 is delimited on the one hand by a rounded end wall 13 and on the other hand by a bolt 14. The bolt 14 is welded to the housing 4. The arrangement is such that the support piece 10 can be inserted into the recess 9 in the longitudinal direction, whereupon the gap 12 is filled with the ceramic fiber and the bolt 14 is fastened. The support piece 10 is held securely in this way, and also against being pulled upwards by the migrating heat treatment material. The construction is simple to manufacture and easy to assemble.

Die Querschnittsgestaltung des Tragstücks kann von der in Fig. 2 gezeigten Form abweichen, solange sichergestellt ist, daß das Wärmebehandlungsgut in ausreichendem Abstand oberhalb des Gehäuses 4 abgestützt wird.The cross-sectional configuration of the support piece can deviate from the shape shown in FIG. 2, as long as it is ensured that the heat treatment material is supported at a sufficient distance above the housing 4.

So zeigt Fig. 3 eine pilzförmige Gestaltung des Tragstücks 10. Das Tragstück übergreift die Seitenwände des Gehäuses 4 und bildet somit eine Abschirmung gegen den Eintritt von Schmutz und sonstigen Fremdpartikeln.3 shows a mushroom-shaped design of the support piece 10. The support piece engages over the side walls of the housing 4 and thus forms a shield against the entry of dirt and other foreign particles.

Bei der Ausführungsform nach Fig. 4 ist der obere Teil des Tragstücks 10 im Querschnitt gerundet ausgebildet. Dadurch wird die Berührungsfläche zwischen dem Tragstück und dem Wärmebehandlungsgut auf ein Minimum reduziert.In the embodiment according to FIG. 4, the upper part of the support piece 10 is rounded in cross section. As a result, the contact area between the support piece and the heat treatment material is reduced to a minimum.

Die Erfindung entfaltet ihre Hauptvorteile dort, wo die oben angegebenen Temperaturverhältnisse herrschen. Anwendbar hingegen ist die Erfindung auch unter anderen Bedingungen. Sie beschränkt sich ferner nicht auf den Einsatz in Hubbalkenöfen, sondern kann beispielsweise auch in Gleichschrittöfen und vor allem in Stoßöfen Anwendung finden.The invention has its main advantages where the temperature conditions specified above prevail. In contrast, the invention can also be used under other conditions. Furthermore, it is not limited to use in walking beam furnaces, but can also be used, for example, in step-by-step furnaces and above all in push furnaces.

Im übrigen läßt die Erfindung weiten Raum für Abwandlungen der beschriebenen Ausführungsbeispiele. So können die Tragstücke 10 der Ausführungsformen nach den Figuren 2 und 3 ebenfalls eine gerundete Tragfläche 11 aufweisen, wie sie sich aus Fig. 4 ergibt. Ferner kann der Riegel 14 nach Fig. 1 lösbar mit dem Gehäuse 4 verbunden, beispielsweise eingesteckt, werden, um einen Austausch des Tragstücks 10 zu erleichtern. In den Spaltraum 12 zwischen dem Tragstück 10 und dem Gehäuse 4 kann anstelle der Keramikfasern auch Mörtel eingebracht werden. Gleiches gilt für die Spalträume 8 gemäß Fig. 2. Weiterhin kann die Anordnung nach Fig. 1 dergestalt umgekehrt werden, daß die Stirnwand 13 nach hinten und der Riegel 14 nach vorne gelangt. Der Vorsprung 5 wird dann vorzugsweise ebenfalls umgesetzt. Im übrigen kann dieser Vorsprung 5 auch seitlich angeordnet werden. Insbesondere unter dieser Voraussetzung wird man anstelle des Bolzens 6 eine andere Verriegelung wählen. Erwähnt sei noch, daß jedes Gehäuse auch eine Mehrzahl von Tragstücken aufnehmen kann.Otherwise, the invention leaves ample scope for modifications of the exemplary embodiments described. Thus, the support pieces 10 of the embodiments according to FIGS. 2 and 3 can also have a rounded support surface 11, as can be seen in FIG. 4. Furthermore, the latch 14 according to FIG. 1 can be detachably connected to the housing 4, for example inserted, in order to facilitate an exchange of the support piece 10. Mortar can also be introduced into the gap 12 between the support piece 10 and the housing 4 instead of the ceramic fibers. The same applies to the gap spaces 8 according to FIG. 2. Furthermore, the arrangement according to FIG. 1 can be reversed in such a way that the end wall 13 moves to the rear and the latch 14 moves to the front. The projection 5 is then preferably also implemented. Otherwise, this projection 5 can also be arranged laterally. Especially under this condition, you will choose a different lock instead of the bolt 6. It should also be mentioned that each housing can also accommodate a plurality of support pieces.

Claims (8)

Vorrichtung zum Abstützen von Wärmebehandlungsgut, insbesondere von Brammen, Knüppeln Blöcken u.dgl., in einem Erwärmungsofen, insbesondere in einem Hubbalkenofen, mit mindestens einem kühlmitteldurchströmten Tragrohr (1) und mindestens einem auf dem Tragrohr angeordneten, hochtemperaturfesten Reiter (3),
      dadurch gekennzeichnet,
daß der Reiter (3) ein auf das Tragrohr (1) aufgesetztes und mit diesem lösbar verbundenes Gehäuse (4) aus hitzebeständigem Guß aufweist, daß das Gehäuse (4) mit mindestens einer oben offenen Ausnehmung (9) versehen ist, die in Längsrichtung des Tragrohres (1) schwalbenschwanzförmig ausgebildet ist und stirnseitig einerseits von einer Stirnwand (13) und andererseits von einem Riegel (14) begrenzt wird, und daß in die Ausnehmung (9) des Gehäuses (4) ein im wesentlichen aus keramischem Material bestehendes Tragstück (10) eingesetzt ist, das mit seinem oberen Teil eine Auflagefläche (11) für das Wärmebehandlungsgut bildet und in seinem unteren Teil in Längsrichtung des Tragrohres (1) schwalbenschwanzförmig ausgebildet ist.Device for supporting heat treatment material, in particular slabs, billet blocks and the like, in a heating furnace, in particular in a walking beam furnace, with at least one support tube (1) through which coolant flows and at least one high-temperature-resistant tab (3) arranged on the support tube,
characterized by
that the rider (3) on the support tube (1) and detachably connected to this housing (4) made of heat-resistant cast, that the housing (4) is provided with at least one open recess (9) in the longitudinal direction of the Support tube (1) is dovetail-shaped and is delimited on the end side by an end wall (13) and on the other hand by a bolt (14), and that in the recess (9) of the housing (4) there is a support piece (10) consisting essentially of ceramic material ) is used, which forms with its upper part a bearing surface (11) for the heat treatment material and in its lower part in the longitudinal direction of the support tube (1) is dovetail-shaped. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Stirnwand (13) des Gehäuses (4) quer zur Längsrichtung des Tragrohres (1) gerundet ausgebildet ist.Device according to claim 1, characterized in that the end wall (13) of the housing (4) is rounded transversely to the longitudinal direction of the support tube (1). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zwischen dem Tragstück (10) und der Ausnehmung (9) des Gehäuses (4) ein Spaltraum (12) gebildet wird, der mit Keramikfasern, Mörtel o.dgl. ausgefüllt ist.Apparatus according to claim 1 or 2, characterized in that a gap (12) is formed between the support piece (10) and the recess (9) of the housing (4), or the like with ceramic fibers, mortar. is filled out. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der obere Teil des Tragstücks (10) quer zur Längsrichtung des Tragrohres (1) gerundet ausgebildet ist.Device according to one of claims 1 to 3, characterized in that the upper part of the support piece (10) is rounded transversely to the longitudinal direction of the support tube (1). Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der obere Teil des Tragstücks (10) quer zur Längsrichtung des Tragrohres (1) pilzförmig ausgebildet ist.Device according to one of claims 1 to 4, characterized in that the upper part of the support piece (10) is mushroom-shaped transversely to the longitudinal direction of the support tube (1). Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der obere Teil des Tragstücks (10) bis zur Auflagefläche (11) seiner Form nach eine Fortsetzung des schwalbenschwanzförmigen unteren Teils bildet.Device according to one of claims 1 to 4, characterized in that the upper part of the support piece (10) forms a continuation of the dovetail-shaped lower part up to the bearing surface (11). Vorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Gehäuse (4) einen Vorsprung (5) des Tragrohres (1) übergreift und daß ein Bolzen (6) quer zur Längsrichtung des Tragrohres durch diesen Vorsprung und durch das Gehäuse hindurchgesteckt ist.Device according to one of claims 1 to 6, characterized in that the housing (4) engages over a projection (5) of the support tube (1) and that a bolt (6) is inserted transversely to the longitudinal direction of the support tube through this projection and through the housing . Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Gehäuse (4) den oberen Bereich des Tragrohres (1) umgreift und sich an eine den Rest des Tragrohres umgebende Isolierung (7) anschließt.Device according to one of claims 1 to 7, characterized in that the housing (4) surrounds the upper region of the support tube (1) and adjoins an insulation (7) surrounding the rest of the support tube.
EP90124217A 1990-02-01 1990-12-14 Device for supporting heat-treated products in a reheating furnace Expired - Lifetime EP0439760B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002870 1990-02-01
DE4002870A DE4002870A1 (en) 1990-02-01 1990-02-01 DEVICE FOR SUPPORTING HEAT TREATMENT IN A WARMING OVEN

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EP0439760A1 true EP0439760A1 (en) 1991-08-07
EP0439760B1 EP0439760B1 (en) 1994-09-07

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US (1) US5136610A (en)
EP (1) EP0439760B1 (en)
AT (1) ATE111208T1 (en)
CA (1) CA2034781C (en)
DE (2) DE4002870A1 (en)
PL (1) PL166265B1 (en)
RU (1) RU1831646C (en)

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US5405264A (en) * 1992-04-23 1995-04-11 Loi Essen Industrieofenanlagen Gmbh Device for carrying a charge in a furnace
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US5558045A (en) * 1994-09-14 1996-09-24 Wheelabrator Environmental Systems, Inc. Refractory tile for open-spaced boiler tubes
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Also Published As

Publication number Publication date
DE4002870A1 (en) 1991-08-08
CA2034781A1 (en) 1991-08-02
ATE111208T1 (en) 1994-09-15
EP0439760B1 (en) 1994-09-07
DE59007062D1 (en) 1994-10-13
US5136610A (en) 1992-08-04
PL288788A1 (en) 1991-08-12
RU1831646C (en) 1993-07-30
PL166265B1 (en) 1995-04-28
CA2034781C (en) 1996-02-06

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