EP0298019B1 - Use of a furnace roller - Google Patents

Use of a furnace roller Download PDF

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Publication number
EP0298019B1
EP0298019B1 EP88730144A EP88730144A EP0298019B1 EP 0298019 B1 EP0298019 B1 EP 0298019B1 EP 88730144 A EP88730144 A EP 88730144A EP 88730144 A EP88730144 A EP 88730144A EP 0298019 B1 EP0298019 B1 EP 0298019B1
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EP
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Prior art keywords
roller
furnace
spindle
use according
furnace roller
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EP88730144A
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German (de)
French (fr)
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EP0298019A1 (en
Inventor
Dieter Grund
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OSBORN INTERNATIONAL GMBH
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OSBORN INTERNATIONAL GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • 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
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails

Definitions

  • the invention relates to the use of a furnace roller for the transport of elongated metallic annealing material with a rigid, rotatably mounted axis. Such roles are used for the promotion of z. B. sheets or steel strips used in heat treatment in continuous furnaces.
  • These partially driven furnace rollers made of heat-resistant steel are the cause of constant operating problems, particularly in the inlet area of the annealing furnace and the preheating zone. After a short period of operation, pimple-like growths form on the rollers, which leads to considerable damage to the surface of the material to be conveyed, which is soft due to the heat treatment.
  • coated tapes e.g. B. galvanized steel belts, have scratches and marks from the pimples of the oven rollers or from the oven rollers loosened and adhering to the belt surface growths.
  • the cause of the growth or pimples is seen in mill scale particles or other foreign bodies that stick to the oven rollers and can gradually grow up to more than the size of coffee beans or ring bulges in layers.
  • the remedy is to blow in gases that inhibit pimple growth (US Pat. No. 2,671,038) into the gap between the annealing material and the furnace roller. Apart from the problem of blowing in the correct amount of gas depending on the annealing material and temperature, this is a very expensive process.
  • US Pat. No. 3,087,599 discloses a brush-type furnace roller for transporting aluminum plates through heating furnaces at temperatures of approximately 590 ° C. (1100 ° F.).
  • the invention has for its object to use a furnace roller that avoids the formation of pimples or growths when used in hot-dip galvanizing plants and promotes the material to be treated in the furnace as far as possible without surface damage.
  • Such a jacket structure of the furnace roller can be achieved simply by lacing disks on the rigid axis of the furnace roller and fixing them on the axis by means of grooves or springs and side plates.
  • the disks consist of tightly pressed, commercially available round wire brushes, which are made of heat-resistant wire with a central holding ring that is open for receiving on the axis.
  • Another possibility is to wind brush strips helically around the rigid axle, to compress them and to fasten them to the axle.
  • the brush heads then form the roller shell, the transport roller surface.
  • a steel strip 1 to be galvanized 3 mm thick and 1500 mm wide is conveyed through an oven of a hot-dip galvanizing plant, not shown, and is heat-treated in the process (FIG. 1).
  • the furnace atmosphere (protective gas) and thus the steel strip 1 are heated to 800 ° C. by means of jet pipes 4 from gas burners (not shown) inserted into the wall 3 of the furnace 2.
  • the oven rollers 6, 11 shown have a special roller surface that prevents pimple growth.
  • the furnace roller 11 with a rigid axis 9 is roller-mounted on both ends, not shown.
  • the oven roll 11 is assembled over a width of 1600 mm from individual 50 mm wide disks 12, which are covered with steel wires 13 (FIG. 2) and have a bore 14 for receiving the axis 9. From the roller ends, the disks 12 are pressed together by flange plates 10 welded onto the axis 9.
  • the disks 12 are so closely covered with steel wires 13 of 1.5 mm in diameter that the supporting surface of the furnace roller 11 is approximately 40% of a theoretically cylindrical roller.
  • the second furnace roller 6 in the right part of FIG. 1 has a roller bearing, also not shown, on both ends of the driven rigid axle 5.
  • a profile strip 8 is wound helically around this axis 5 and held at both ends of the axis 5 by press collars 7.
  • Fig. 3 shows a section of the 1 mm thick profile strip 8 in side view.
  • the 50 mm high profile strip 8 made of spring steel alternately has narrow teeth 15 and wide teeth 16 with gaps 17 on the upper side.
  • the profile band 8 is notched on the underside so that it can be wound around the axis 5 of the furnace roller 6. After winding up the profile strip 8, due to different tooth widths a, b of the teeth 15, 16 and thus offset tooth heads of adjacent profile strip windings, an irregular airfoil pattern results as the load-bearing “roller surface” of the oven roller 6.
  • the ribbon 8 is in the region of the teeth 15, 16 at 0, 8 mm thickness reduced so that there is a gap between the band windings in the tooth area.
  • the furnace rollers 6, 11 are ground after their assembly and before use in the furnace 2 so that they have an exact, defined diameter and thus precise concentricity.
  • furnace rollers 6, 11 described do not show any pimple growth and do not cause any surface damage to the annealing material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Tunnel Furnaces (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

Furnace roller for the transport of elongate metal products through heat treatment furnaces, the theoretical generated surface of which consists of small-surface bearing elements which are separated from one another. <IMAGE>

Description

Die Erfindung betrifft die Verwendung einer Ofenrolle für den Transport langgestreckten metallischen Glühgutes mit starrer, drehbar gelagerter Achse.
Derartige Rollen werden für die Förderung von z. B. Blechen oder Stahlbändern bei der Wärmebehandlung in Durchlauföfen eingesetzt. Diese zum Teil angetriebenen Ofenrollen aus wärmebeständigem Stahl sind insbesondere im Einlaufbereich des Glühofens und der Vorwärmzone Ursache ständiger Betriebsprobleme.
Auf den Rollen bilden sich nach kurzer Betriebszeit pickelartige Aufwachsungen, die zu erheblichen Beschädigungen der durch die Wärmebehandlung weichen Oberfläche des zu fördernden Gutes führt. Insbesondere beschichtete Bänder, z. B. verzinkte Stahlbänder, weisen Kratzer und Abdrücke von den Pickeln der Ofenrollen bzw. von den Ofenrollen gelöste und an der Bandoberfläche haftende Aufwachsungen auf.The invention relates to the use of a furnace roller for the transport of elongated metallic annealing material with a rigid, rotatably mounted axis.
Such roles are used for the promotion of z. B. sheets or steel strips used in heat treatment in continuous furnaces. These partially driven furnace rollers made of heat-resistant steel are the cause of constant operating problems, particularly in the inlet area of the annealing furnace and the preheating zone.
After a short period of operation, pimple-like growths form on the rollers, which leads to considerable damage to the surface of the material to be conveyed, which is soft due to the heat treatment. In particular coated tapes, e.g. B. galvanized steel belts, have scratches and marks from the pimples of the oven rollers or from the oven rollers loosened and adhering to the belt surface growths.

Die Ursache der Aufwachsungen oder Pickel wird in Walzzunderteilchen oder anderen Fremdkörpern gesehen, die an den Ofenrollen haften bleiben und nach und nach bis zu mehr als Kaffeebohnengröße oder zu Ringwulsten schichtweise aufwachsen können. Abhilfe soll das Einblasen von das Pickelwachstum hemmenden Gasen (US-PS 26 71 038) in den Spalt zwischen Glühgut und Ofenrolle bringen. Abgesehen von dem Problem, die richtige Gasmenge je nach Glühgut und Temperatur einzublasen, ist dies ein sehr teures Verfahren.
Gleiches gilt für den Vorschlag (DE-OS 14 58 979), zwischen Transportrolle und zu behandelnden Gut als Hemmstoff gegen Pickelwachstum nichtmetallische, pulverförmige Partikel, wie Oxide von Magnesium, Kalzium, Titan oder Aluminium etc., einzubringen.The cause of the growth or pimples is seen in mill scale particles or other foreign bodies that stick to the oven rollers and can gradually grow up to more than the size of coffee beans or ring bulges in layers. The remedy is to blow in gases that inhibit pimple growth (US Pat. No. 2,671,038) into the gap between the annealing material and the furnace roller. Apart from the problem of blowing in the correct amount of gas depending on the annealing material and temperature, this is a very expensive process.
The same applies to the proposal (DE-OS 14 58 979) to introduce non-metallic, powdery particles such as oxides of magnesium, calcium, titanium or aluminum etc. between the transport roller and the material to be treated as an inhibitor against pimple growth.

Dem Problem hoher Betriebskosten für das Zusatzmaterial begegnet die Lösung, die Transportrollen mit Aluminiumoxid (US-PS 26 63 558) oder Ferrosilizium (US-PS 26 95 248) zu überziehen. Die Praxis hat jedoch gezeigt, daß die Beschichtung der Rollen ebenfalls aufwendig und die Standzeit nicht zufriedenstellend ist. Derzeit werden die Ofenrollen nach teilweise erst vierstündiger Betriebszeit ausgewechselt und geschliffen, manchmal auch noch verchromt.The solution to the problem of high operating costs for the additional material is to coat the transport rollers with aluminum oxide (US Pat. No. 2,663,558) or ferrosilicon (US Pat. No. 2,695,248). However, practice has shown that the coating of the rollers is also complex and the service life is unsatisfactory. At the moment, the oven rolls are sometimes replaced and ground, sometimes even chrome-plated, after an operating time of only four hours.

Als nicht zufriedenstellend werden Alternativen mit ständiger oder diskontinuierlicher (DE-OS 35 30 517) Wasserkühlung beurteilt da die Rollenkonstruktion sehr aufwendig ist und/oder der Wasserverbrauch bzw. der Energieverlust im Ofen durch Kühlen die Wirtschaftlichkeit beeinträchtigt.
Versuche haben gezeigt, daß Schwankungen in der Charakteristik der Ofenatmosphäre sofort eine vermehrte Pickelbildung zur Folge haben. Ein Variieren dieser Bedingungen schafft also keine Abhilfe.Alternatives with constant or discontinuous (DE-OS 35 30 517) water cooling are judged to be unsatisfactory since the roller construction is very complex and / or the water consumption or the energy loss in the oven due to cooling affects the economy.
Experiments have shown that fluctuations in the characteristics of the furnace atmosphere immediately lead to an increased formation of pimples. Varying these conditions does not remedy the situation.

Geringfügige Verbesserungen werden durch gezielte Einstellung einer Relativgeschwindigkeit zwischen Transportrolle und Glühgut erreicht, z. B. durch' Drehzahlregelung der Rollenantriebe. Dabei entstehen aber auch Beschädigungen der Oberfläche des wärmebehandelten Gutes.Minor improvements are achieved through the targeted setting of a relative speed between the transport roller and the annealing material, e.g. B. by 'speed control of the roller drives. This also causes damage to the surface of the heat-treated goods.

Weiterhin ist aus der US-PS 3 087 599 bereits eine bürstenartige Ofenrolle zum Transport von Aluminiumplatten durch Wärmeöfen bei Temperaturen von ca. 590°C (1100°F) bekannt.Furthermore, US Pat. No. 3,087,599 discloses a brush-type furnace roller for transporting aluminum plates through heating furnaces at temperatures of approximately 590 ° C. (1100 ° F.).

Ausgehend von diesem Stand der Technik, liegt der Erfindung die Aufgabe zugrunde, eine Ofenrolle zu verwenden, die beim Einsatz in Feuerverzinkungsanlagen das Entstehen von Pickeln oder Aufwachsungen vermeidet und das im Ofen zu behandelnde Gut möglichst ohne Oberflächenbeschädigung fördert.Proceeding from this prior art, the invention has for its object to use a furnace roller that avoids the formation of pimples or growths when used in hot-dip galvanizing plants and promotes the material to be treated in the furnace as far as possible without surface damage.

Die Aufgabe wird durch die im Anspruch 1 genannten Merkmale gelöst. Vorteilhafte Weiterbildungen der Erfindung sind durch die Unteranprüche 2 bis 5 erfaßt.The object is achieved by the features mentioned in claim 1. Advantageous developments of the invention are covered by the dependent claims 2 to 5.

Bei der Verwendung von feuerverzinktem Stahlband, z. B. für Autokarosserien, werden heute Beschädigungen oder haftende Aufwachsungen an der verzinkten Oberfläche nur noch in Größenordnungen von z. B. drei Pickel/m² Blechoberfläche toleriert. Diese Qualität läßt sich mit Ofenrollen der erfindungsgemäßen Art erreichen.When using hot-dip galvanized steel strip, e.g. B. for car bodies, damage or adhesive growth on the galvanized surface are now only in the order of z. B. three pimples / m² sheet surface tolerated. This quality can be achieved with oven rolls of the type according to the invention.

Es wurde überraschend festgestellt, daß das bisher unvermeidliche Pickelwachstum unterbunden wird, wenn derartige Ofenrollen entgegen der bisherigen Erwartung keine glatte zylindrische Oberfläche haben. Wird der wirksame, transportierende "Rollenmantel" in eine Vielzahl von tragenden Punkten aufgelöst, enstehen praktisch keine Aufwachsungen. Offensichtlich finden die zu Pickeln wachsenden Fremdkörper an derartigen Rollenoberflächen nicht genügend Halt.It was surprisingly found that the hitherto unavoidable pimple growth is prevented if, contrary to the previous expectation, such oven rolls do not have a smooth cylindrical surface. If the effective, transporting "roll shell" is broken down into a number of load-bearing points, there is practically no growth. Obviously, the foreign bodies growing into pimples do not find enough support on such roller surfaces.

Gute Ergebnisse werden erzielt, wenn der Traganteil des Rollenmantels auf 40 bis 70 % der theoretischen Zylinderoberfläche reduziert wird.
Unter 20 % Traganteil werden die Bandbeschädigungen zu groß; bei über 80 % Traganteil entsteht wieder Pickelwachstum. Die tragenden Elemente der Ofenrolle sollten flächig ausgebildet sein, damit die spezifische Flächenpressung nicht zu groß wird und keine Oberflächenschäden am Glühgut erzeugt werden.Good results are achieved if the load share of the roller jacket is reduced to 40 to 70% of the theoretical cylinder surface.
The band damage becomes too large below 20% of the load; with more than 80% load share, pimples grow again. The load-bearing elements of the furnace roller should be flat so that the specific surface pressure does not become too great and no surface damage to the annealing material is generated.

Als günstig haben sich Kleinflächen von 0,05 bis 5 mm² Größe für die tragenden Elemente erwiesen.
Eine unregelmäßige Verteilung der tragenden Flächen reduziert die Möglichkeit, daß gleichförmige Abdrücke am Glühgut auftreten und unterdrückt das periodische Pickelwachstum.Small areas of 0.05 to 5 mm² in size have proven to be favorable for the load-bearing elements.
An irregular distribution of the load-bearing surfaces reduces the possibility that uniform marks appear on the annealing material and suppresses the periodic pimple growth.

Eine derartige Mantelstruktur der Ofenrolle läßt sich einfach dadurch erreichen, daß Scheiben auf der starren Achse der Ofenrolle aufgereiht und durch Nuten oder Federn sowie Seitenbleche auf der Achse festgelegt werden. Die Scheiben bestehen dabei aus enggepreßten handelsüblichen Rund-Drahtbürsten, die sich aus hitzebeständigem Draht mit zentralem, für die Aufnahme auf der Achse durchbrochenem Haltering zusammensetzen.Such a jacket structure of the furnace roller can be achieved simply by lacing disks on the rigid axis of the furnace roller and fixing them on the axis by means of grooves or springs and side plates. The disks consist of tightly pressed, commercially available round wire brushes, which are made of heat-resistant wire with a central holding ring that is open for receiving on the axis.

Eine weitere Möglichkeit besteht darin, Bürstenbänder schraubenförmig um die Starrachse zu wickeln, zusammenzupressen und an der Achse zu befestigen. Die Bürstenköpfe bilden dann den Rollenmantel, die Transportrollenoberfläche.Another possibility is to wind brush strips helically around the rigid axle, to compress them and to fasten them to the axle. The brush heads then form the roller shell, the transport roller surface.

Anhand schematischer Zeichnungen soll die Erfindung näher erläutert werden. Es zeigen:

  • Fig. 1 zwei unterschiedliche erfindungsgemäße Ofenrollen in Arbeitsposition;
  • Fig. 2 einen Teil einer ersten erfindungsgemäßen Ofenrolle geßäß Fig. 1 und
  • Fig. 3 einen Teil einer zweiten erfindungsgemäßen Ofenrolle gemäß Fig. 1.
The invention will be explained in more detail with the aid of schematic drawings. Show it:
  • Figure 1 shows two different oven rolls according to the invention in the working position.
  • Fig. 2 shows a part of a first oven roll according to the invention according to Fig. 1 and
  • 3 shows part of a second furnace roller according to the invention according to FIG. 1.

Ein zu verzinkendes Stahlband 1 von 3 mm Dicke und 1500 mm Breite wird durch einen Ofen einer nicht dargestellten Feuerverzinkungsanlage gefördert und dabei wärmebehandelt (Fig. 1). Durch in die Wand 3 des Ofens 2 eingesetzte Strahlrohre 4 von nicht dargestellten Gasbrennern wird die Ofenatmosphäre (Schutzgas) und somit das Stahlband 1 auf 800° C erwärmt. Zwei Ofenrollen 6, 11, hier dargestellt in unterschiedlicher Bauart, in der Regel jedoch gleicher Bauart, fördern das Stahlband 1 in der durch Pfeile angedeuteten Richtung durch den Ofen 2.A steel strip 1 to be galvanized 3 mm thick and 1500 mm wide is conveyed through an oven of a hot-dip galvanizing plant, not shown, and is heat-treated in the process (FIG. 1). The furnace atmosphere (protective gas) and thus the steel strip 1 are heated to 800 ° C. by means of jet pipes 4 from gas burners (not shown) inserted into the wall 3 of the furnace 2. Two furnace rollers 6, 11, shown here in different designs, but generally of the same construction, convey the steel strip 1 through the furnace 2 in the direction indicated by arrows.

Insbesondere auf den ersten Rollen im Einlaufbereich des Glühofens wachsen Pickel auf. Daher besitzen die dargestellten Ofenrollen 6, 11 eine besondere Rollenoberfläche, die das Pickelwachstum verhindert.
Die Ofenrolle 11 mit starrer Achse 9 ist an beiden, nicht dargestellten Enden wälzgelagert. Die Ofenrolle 11 ist auf einer Breite von 1600 mm aus einzelnen 50 mm breiten Scheiben 12, die mit Stahldrähten 13 (Fig. 2) besetzt sind und eine Bohrung 14 zur Aufnahme der Achse 9 aufweisen, zusammengesetzt. Von den Rollenenden her werden die Scheiben 12 durch auf der Achse 9 festgeschweißte Bundbleche 10 zusammengepreßt.
Die Scheiben 12 sind so eng mit Stahldrähten 13 von 1,5 mm Durchmesser besetzt, daß die tragende Oberfläche der Ofenrolle 11 etwa 40 % einer theoretisch zylindrischen Rolle beträgt. Das durch die Wärmebehandlung relativ weiche Stahlband 1 liegt nur auf den Stirnflächen der Stahldrähte 13 auf.Pimples grow in particular on the first rollers in the inlet area of the annealing furnace. Therefore, the oven rollers 6, 11 shown have a special roller surface that prevents pimple growth.
The furnace roller 11 with a rigid axis 9 is roller-mounted on both ends, not shown. The oven roll 11 is assembled over a width of 1600 mm from individual 50 mm wide disks 12, which are covered with steel wires 13 (FIG. 2) and have a bore 14 for receiving the axis 9. From the roller ends, the disks 12 are pressed together by flange plates 10 welded onto the axis 9.
The disks 12 are so closely covered with steel wires 13 of 1.5 mm in diameter that the supporting surface of the furnace roller 11 is approximately 40% of a theoretically cylindrical roller. The steel strip 1, which is relatively soft due to the heat treatment, rests only on the end faces of the steel wires 13.

Die zweite Ofenrolle 6 im rechten Teil von Fig. 1 weist eine ebenfalls nicht dargestellte Wälzlagerung an beiden Enden der angetriebenen starren Achse 5 auf. Um diese Achse 5 ist ein Profilband 8 schraubenförmig gewickelt und an beiden Enden der Achse 5 durch Preßbunde 7 gehalten.The second furnace roller 6 in the right part of FIG. 1 has a roller bearing, also not shown, on both ends of the driven rigid axle 5. A profile strip 8 is wound helically around this axis 5 and held at both ends of the axis 5 by press collars 7.

Fig. 3 zeigt einen Abschnitt des 1 mm dicken Profilbandes 8 in Seitenansicht.
Das 50 mm hohe Profilband 8 aus Federstahl weist an der Oberseite abwechselnd schmale Zähne 15 und breite Zähne 16 mit Lücken 17 auf. Die Zahnbreiten betragen a = 1 mm und b = 5 mm.
An der Unterseite ist das Profilband 8 gekerbt, damit es um die Achse 5 der Ofenrolle 6 gewickelt werden kann.
Nach Aufwickeln des Profilbandes 8 ergibt sich aufgrund unterschiedlicher Zahnbreiten a, b der Zähne 15, 16 und damit versetzten Zahnköpfen benachbarter Profilbandwindungen ein unregelmäßiges Tragflächenmuster als tragende "Rollenoberfläche" der Ofenrolle 6. Das Band 8 ist im Bereich der Zähne 15,16 auf 0,8 mm Dicke reduziert, damit zwischen den Bandwindungen im Zahnbereich ein Abstand entsteht.Fig. 3 shows a section of the 1 mm thick profile strip 8 in side view.
The 50 mm high profile strip 8 made of spring steel alternately has narrow teeth 15 and wide teeth 16 with gaps 17 on the upper side. The tooth widths are a = 1 mm and b = 5 mm.
The profile band 8 is notched on the underside so that it can be wound around the axis 5 of the furnace roller 6.
After winding up the profile strip 8, due to different tooth widths a, b of the teeth 15, 16 and thus offset tooth heads of adjacent profile strip windings, an irregular airfoil pattern results as the load-bearing “roller surface” of the oven roller 6. The ribbon 8 is in the region of the teeth 15, 16 at 0, 8 mm thickness reduced so that there is a gap between the band windings in the tooth area.

Die Ofenrollen 6, 11 werden nach ihrem Zusammenbau und vor Einsatz in den Ofen 2 an der Oberfläche geschliffen, damit sie einen exakten, definierten Durchmesser und somit präzisen Rundlauf haben.The furnace rollers 6, 11 are ground after their assembly and before use in the furnace 2 so that they have an exact, defined diameter and thus precise concentricity.

Die beschriebenen Ofenrollen 6,11 zeigen keinerlei Pickelwachstum und erzeugen keine Oberflächenbeschädigungen am Glühgut.The furnace rollers 6, 11 described do not show any pimple growth and do not cause any surface damage to the annealing material.

Claims (5)

  1. Use of a furnace roller for transporting elongated metal incandescent material through a hot galvanizing installation at temperatures of 600°C to to 800°C, the said roller having a rigid, rotatably mounted spindle and a superficies which only partially touches the incandescent material and consists of a plurality of supporting elements of small area, the total area of which amounts to 20 to 80% of the theoretical superficies of the furnace roller and which essentially have an irregular interval between them and a cross-sectional area of 0.01 to 30 mm² in each case.
  2. Use according to claim 1, characterized in that the total area of the supporting elements amounts to 40 to 70% of the theoretical superficies of the furnace roller.
  3. Use according to claim 1, characterized in that the supporting elements have a cross-sectional area of 0.05 to 5 mm² in each case.
  4. Use according to one of claims 1 to 3, characterized in that the said roller consists, at least over the load-bearing width, of discs (12) which are lined up and fixed in position on the spindle (5, 9) and are constructed as round wire brushes and made up of heat-resistant wire.
  5. Use according to claim 1, characterized in that the said roller is formed from a strip (8) which is wound in the form of a spiral around the rigid spindle (5, 9) and has supporting elements which extend away radially from the spindle (5, 9) and end in surfaces of small area.
EP88730144A 1987-07-03 1988-07-01 Use of a furnace roller Expired - Lifetime EP0298019B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3722487A DE3722487C1 (en) 1987-07-03 1987-07-03 Oven roll
DE3722487 1987-07-03

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Publication Number Publication Date
EP0298019A1 EP0298019A1 (en) 1989-01-04
EP0298019B1 true EP0298019B1 (en) 1995-10-11

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AT (1) ATE129068T1 (en)
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DE4041217A1 (en) * 1989-12-23 1991-07-11 Reining Heisskuehlung Gmbh & C Driven roller for continuous heating furnace - has core tube enclosed in removable layer of thermal insulation
DE4006497A1 (en) * 1990-01-18 1991-07-25 Nassheuer Loi Industrieofenanl Transporting roller for heated products in ovens - has cylindrical body and screw form transporting surface with larger pitch in centre than at ends
FR2749378A1 (en) * 1996-05-29 1997-12-05 Jose A Lomba Camina S A Rollers for the conveying of ceramic articles in a heating furnace

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US3087599A (en) * 1960-07-19 1963-04-30 Osborn Mfg Co Conveyor roll
DE1458995A1 (en) * 1964-06-05 1969-01-30 Huettenwerk Oberhausen Ag Process for inhibiting or preventing the formation of pimples on heat-resistant transport devices such as rollers, continuous ovens for annealing sheet metal and the like. like
DE1458979A1 (en) * 1965-05-31 1969-09-18 Biebrach Dr Michael Process to prevent the scaling of steel or workpieces made from it
FR94427E (en) * 1967-11-23 1969-08-14 Long Bernard Process for improving the quality of the faces of a continuous ribbon of glass.
AT348568B (en) * 1975-09-25 1979-02-26 Siemens Ag Oesterreich ROLLER FOR ROLLER STOVES
GB1543523A (en) * 1976-03-30 1979-04-04 Goodyear Tire & Rubber Strip conveyor with steering means
IT8222126V0 (en) * 1982-06-09 1982-06-09 Siti ROLLER FOR SUPPORTING AND ADVANCING CERAMIC OBJECTS.
DE3301660C2 (en) * 1983-01-17 1985-02-14 W. Haldenwanger Technische Keramik GmbH & Co KG, 1000 Berlin Device for supporting flat ceramic objects to be burned in a roller kiln
DE3514086A1 (en) * 1985-04-18 1986-10-23 Buchtal Gmbh, 8472 Schwarzenfeld ROLLER OVEN FOR BURNING A PLATE-SHAPED CERAMIC COMBUSTION
DE3530517A1 (en) * 1985-08-27 1987-03-12 Band Zink Gmbh Method for removing overgrowth (dimples) from water-coolable furnace rollers in strip-galvanizing devices

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ATE129068T1 (en) 1995-10-15
EP0298019A1 (en) 1989-01-04
DE3722487C1 (en) 1988-03-03

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