EP0331937B1 - Roll hearth furnace for heating slabs, ingots, billets, metal sheets and similar materials - Google Patents

Roll hearth furnace for heating slabs, ingots, billets, metal sheets and similar materials Download PDF

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Publication number
EP0331937B1
EP0331937B1 EP89102655A EP89102655A EP0331937B1 EP 0331937 B1 EP0331937 B1 EP 0331937B1 EP 89102655 A EP89102655 A EP 89102655A EP 89102655 A EP89102655 A EP 89102655A EP 0331937 B1 EP0331937 B1 EP 0331937B1
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EP
European Patent Office
Prior art keywords
furnace
hearth
rollers
roller
space
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.)
Expired - Lifetime
Application number
EP89102655A
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German (de)
French (fr)
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EP0331937A1 (en
Inventor
Paul Freieck
Peter Holz
Horst Mathejka
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Didier Ofu Engineering GmbH
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Didier Engineering GmbH
Didier Ofu Engineering GmbH
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Priority to AT89102655T priority Critical patent/ATE67025T1/en
Publication of EP0331937A1 publication Critical patent/EP0331937A1/en
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Publication of EP0331937B1 publication Critical patent/EP0331937B1/en
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Classifications

    • 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
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F27D25/001—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag comprising breaking tools, e.g. hammers, drills, scrapers
    • 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 a roller hearth furnace for heating slabs, blocks, billets, sheets or similar heating material, the furnace space of which is formed with a longitudinally continuous roller table, the furnace having an upper furnace space serving as a heating space and a lower furnace space, between which a hearth floor with recesses is arranged for the oven rollers of the roller table, which are stored below the stove floor in the room below the upper oven room.
  • roller hearth furnaces for a continuous flow of the heating material.
  • the furnace rollers are heated very strongly.
  • this system requires an extensive water cooling device that is burdened with high water and energy consumption. A great deal of heat is removed from the furnace space via the cooling water circulation.
  • the invention has for its object to provide a roller hearth furnace with which the energy losses and costs are reduced and thus the furnace operation is made more economical.
  • the oven rollers are mounted so that they can be raised and lowered in such a way that in their raised working position they each have only a small roller section having the upper section of their circular cylindrical running surface through one of the recesses up to above the hearth level in the upper oven chamber protrude.
  • the roller table which transports the pieces of heat through the furnace space is basically in a cool area outside the hot furnace space with all essential parts which are responsible for its temperature stability. Only the oven rollers only protrude with their treads into this hot oven chamber, and with such a small roller section that they can absorb little heat, which in turn is largely dissipated outside, ie in the lower oven chamber. Consequently, without special cooling measures and without special energy costs, this leads to a sufficient temperature stability of the roller table and thus to a more economical furnace operation than in the known roller hearth furnaces with the usual water cooling system. By having the furnace rollers lowered from this position, it is achieved that when the furnace is at a standstill, e.g.
  • the furnace rollers can be completely lowered from the hot furnace space and the heating material can be placed on the stove floor. This avoids that the running surfaces of the oven rollers are exposed to excessive heat when the system is at a standstill.
  • the oven rollers below the hearth floor are each assigned a cleaning device attacking their running surfaces.
  • a knife-like steel band can be resiliently fastened to the roller bearings in each case such that the running surface is below the hearth floor the oven roll constantly sweeps past the knife edge of the steel belt.
  • This steel strip in the manner of a doctor blade, wipes off any caking from the running surface, after which a stationary or rotating brush finally cleans the running surface and / or preferably also applies a powder layer largely avoiding the caking, for example made of quartz powder, graphite or aluminum oxide powder.
  • the furnace rollers are expediently provided on their peripheral surfaces with an annular casing made of heat-resistant material and containing the running surface.
  • the furnace rollers are preferably coated with a heat-resistant steel or with a refractory ceramic made of, for example, silicon carbide (SiC) or zirconium oxide (ZrO2). It can often be expedient to produce the oven rolls entirely from a corresponding refractory ceramic.
  • the furnace rollers or at least their casing having the running surfaces are composed of segments. These segments are easy to replace if the treads or their heat-loaded roller sections are damaged.
  • the thermal conduction to the bearing parts and further devices of the roller table can also be further reduced by interposing insulating material between the casing or its segments and the furnace roller base parts.
  • a roller hearth furnace 10 which is particularly suitable for heating thin slabs, is shown with conventional burner heating and a longitudinal continuous roller table.
  • This furnace 10 has an upper furnace chamber 11 and a lower furnace chamber 12, between which a hearth 13 with recesses 14 are arranged in two rows running parallel to one another.
  • the burners 15 are arranged in the upper furnace chamber 11 on both sides in the side walls 16.
  • the upper furnace space 11 sits directly on a foundation F, in the space of which the lower furnace space 12 extends and which is sealed against the foundation space F by water cups 26.
  • the oven rollers 17 of the roller table are stored below the hearth floor 13 in the unheated sub-oven space 12.
  • These rollers 17 are wheel-shaped made of metal with a circular cylindrical circumferential surface and thereon with an annular casing 18 made of heat-resistant material.
  • the circular cylindrical outer surface of this casing 18 forms the running surface 19 for the transport of the heating material 20.
  • This covering 18 is a ring composed of segments, on the running surface 19 of which, in the exemplary embodiment shown, thin slabs are transported through the furnace space as heating material 20.
  • the segments of the annular casing 18 can be made of heat-resistant steel or of a non-metallic material be made of refractory ceramic and are attached to the wheel-shaped metal rollers 17 with the interposition of a thin refractory ceramic fiber mat.
  • the oven rollers 17 only protrude into the hot upper oven space 11 with a small portion of their annular casing 18 and their running surface 19.
  • the metallic roller and bearing parts remain below the hearth level N within the lower oven space 12 and with its roll axes 21 in the foundation room F.
  • the oven rollers 17 can be lowered from this upper transport position.
  • the axes 21 are mounted in the bearing heads of a hoist 22 known per se and are vertically movable together.
  • the furnace rollers 17 can be lowered from the position shown into a lower position, in which the rollers 17 are located completely below the hearth level N.
  • the heating material 20 is placed on the hearth 13 until it is put back into operation.
  • the furnace rollers 17 are also assigned cleaning devices 23 in order to free the running surfaces 19 of raised scale deposits.
  • Each of the cleaning devices 23 contains a frame with a resiliently mounted knife-like steel band 24, on which the running surface 19 of the oven rollers 17 constantly passes.
  • a brush 25 is attached behind it, along which the tread 19 slides. With the help of this brush 25, the tread 19 is finally cleaned and provided with a thin layer of a quartz powder or another suitable powder with which the scale deposits can largely be avoided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The chamber of the furnace is designed with a longitudinally continuous roll bed. The furnace (10) has a hot upper furnace chamber (11), a lower furnace chamber (12) and in between a hearth floor (13) with openings (14). The roll bed is mounted essentially in the lower furnace chamber (12) below the hearth floor (13) and projects only with small sections of its furnace rolls (17) through the openings (14) of the hearth floor (13) above the level (N) of the latter. At least the roll sections, projecting into the hot zone, having the running surface (19), on which the materials to be heated (20) are transported, consist of particularly heat-resistant material which, assembled from segments to form a ring (18), surrounds the furnace rolls (17) on the circumferential surface. Cleaning devices (23, 24, 25) free the running surfaces (19) of the furnace rolls (17) of disturbing scale caking. <IMAGE>

Description

Die Erfindung betrifft einen Rollenherdofen zum Wärmen von Brammen, Blöcken, Knüppeln, Blechen oder dergleichen Wärmgut, dessen Ofenraum mit einem längs durchgehenden Rollgang ausgebildet ist, wobei der Ofen einen als Wärmraum dienenden Oberofenraum und einen Unterofenraum aufweist, zwischen denen ein Herdboden mit Ausnehmungen angeordnet ist für die Ofenrollen des Rollgangs, die unterhalb des Herdbodens im Raum unter dem Oberofenraum gelagert sind.The invention relates to a roller hearth furnace for heating slabs, blocks, billets, sheets or similar heating material, the furnace space of which is formed with a longitudinally continuous roller table, the furnace having an upper furnace space serving as a heating space and a lower furnace space, between which a hearth floor with recesses is arranged for the oven rollers of the roller table, which are stored below the stove floor in the room below the upper oven room.

In der Stahlindustrie ist man bestrebt, den Betrieb der Stranggießanlagen wirtschaftlicher zu machen und mit dem Betrieb der Walzenstraßen abzustimmen. Durch diese Maßnahme soll erreicht werden, daß das Wärmgut entweder direkt verwalzt oder anderenfalls möglichst warm in den der Stranggießanlage nachgeschalteten Wärmofen einläuft. Hierdurch lassen sich die Energiekosten für die walzreife Erwärmung beträchtlich reduzieren. Moderne Wärmöfen müssen deshalb auf diesen kooperativen Erwärmungs- und zeitlich abgestimmten Betriebsablauf verfahrenstechnisch und konstruktiv zugeschnitten sein. Hierfür ist es erforderlich, in der Heizzone bzw. dem Wärmraum eine sehr hohe Raumtemperatur von mindestens 1000 bis 1300 °C aufrechtzuerhalten.In the steel industry, efforts are being made to make the operation of the continuous casting plants more economical and to coordinate them with the operation of the roller mills. This measure is intended to ensure that the material to be heated is either directly rolled or otherwise runs as warmly as possible into the heating furnace downstream of the continuous casting installation. As a result, the energy costs for heating ready for rolling can be reduced considerably. Modern heating furnaces must therefore process and cooperate on this cooperative heating and timed operation be constructively tailored. For this, it is necessary to maintain a very high room temperature of at least 1000 to 1300 ° C in the heating zone or the heating room.

Es ist bekannt, Rollenherdöfen für einen kontinuierlichen Durchlauf des Wärmguts einzusetzen. Jedoch werden hierbei wegen der hohen Temperaturen im Ofenraum, der also etwa bis zu 1300 °C aufgeheizt sein muß, die Ofenrollen sehr stark erwärmt. Um die erforderliche Temperaturstandfestigkeit der Ofenrollen zu erreichen, erfordert diese Anlage eine umfangreiche und mit hohem Wasser- und Energieverbrauch belastete Wasserkühlvorrichtung. Über den Kühlwasserumlauf wird aus dem Ofenraum sehr viel Wärme abgeleitet. Auch kommt es auf den Laufflächen der Ofenrollen zu erhabenen Aufklebungen von Zunder, die auf die Oberfläche der Wärmgutstücke übertragen werden und an ihnen wahllos bis in das Walzwerk anhaften, wo sie als sogenannte Pickel in die Oberfläche der Wärmgutstücke eingewalzt werden und diese qualitativ mindern.It is known to use roller hearth furnaces for a continuous flow of the heating material. However, due to the high temperatures in the furnace chamber, which must be heated up to about 1300 ° C, the furnace rollers are heated very strongly. In order to achieve the required temperature stability of the oven rolls, this system requires an extensive water cooling device that is burdened with high water and energy consumption. A great deal of heat is removed from the furnace space via the cooling water circulation. Also on the running surfaces of the oven rolls there are raised stickings of scale, which are transferred to the surface of the hot material and adhere to it indiscriminately into the rolling mill, where they are rolled into the surface of the hot material as so-called pimples and reduce the quality.

Der Erfindung liegt die Aufgabe zugrunde, einen Rollenherdofen zu schaffen, mit dem die Energieverluste und -kosten verringert und damit der Ofenbetrieb wirtschaftlicher gemacht wird.The invention has for its object to provide a roller hearth furnace with which the energy losses and costs are reduced and thus the furnace operation is made more economical.

Die Aufgabe wird dadurch gelöst, daß die Ofenrollen heb- und senkbar gelagert sind derart, daß sie in ihrer angehobenen Arbeitslage jeweils lediglich mit einem kleinen, den oberen Abschnitt ihrer kreiszylindrischen Lauffläche aufweisenden Rollenabschnitt durch eine der Ausnehmungen bis über das Herdboden-Niveau in den Oberofenraum ragen.The object is achieved in that the oven rollers are mounted so that they can be raised and lowered in such a way that in their raised working position they each have only a small roller section having the upper section of their circular cylindrical running surface through one of the recesses up to above the hearth level in the upper oven chamber protrude.

Hierdurch wird erreicht, daß sich der die Wärmgutstücke durch den Ofenraum transportierende Rollgang grundsätzlich mit allen wesentlichen Teilen, die für dessen Temperaturstandfestigkeit verantwortlich sind, außerhalb des heißen Ofenraums in einem kühlen Bereich befindet. Nur die Ofenrollen ragen hierbei lediglich mit ihren Laufflächen in diesen heißen Ofenraum, und zwar mit einem derart geringen Rollenabschnitt, daß sie nur wenig Wärme aufnehmen können, die wiederum weitgehend außerhalb, also im Unterofenraum, abgeführt wird. Dies führt folglich ohne besondere Kühlmaßnahmen und ohne besondere Energiekosten zu einer ausreichenden Temperaturstandfestigkeit des Rollgangs und mithin zu einem wirtschaftlicheren Ofenbetrieb als bei den bekannten Rollenherdöfen mit dem üblichen Wasserkühlsystem. Indem die Ofenrollen aus dieser Lage absenkbar gelagert sind, wird erreicht, daß bei Ofenstillstand, z.B. bei einer Störung im nachgeschalteten Walzwerk, die Ofenrollen gänzlich aus dem heißen Ofenraum abgesenkt und das Wärmgut auf dem Herdboden aufgelegt sein können. Hierdurch wird vermieden, daß die Laufflächen der Ofenrollen während des Stillstands der Anlage einer zu starken Wärmebelastung ausgesetzt sind.It is hereby achieved that the roller table which transports the pieces of heat through the furnace space is basically in a cool area outside the hot furnace space with all essential parts which are responsible for its temperature stability. Only the oven rollers only protrude with their treads into this hot oven chamber, and with such a small roller section that they can absorb little heat, which in turn is largely dissipated outside, ie in the lower oven chamber. Consequently, without special cooling measures and without special energy costs, this leads to a sufficient temperature stability of the roller table and thus to a more economical furnace operation than in the known roller hearth furnaces with the usual water cooling system. By having the furnace rollers lowered from this position, it is achieved that when the furnace is at a standstill, e.g. in the event of a malfunction in the downstream rolling mill, the furnace rollers can be completely lowered from the hot furnace space and the heating material can be placed on the stove floor. This avoids that the running surfaces of the oven rollers are exposed to excessive heat when the system is at a standstill.

Um ferner die Bildung der sogenannten Pickel durch angehäuftes Anhaften von abgeplatzten Zunderteilchen weitgehend zu vermeiden, sind nach einer Weiterbildung der Erfindung den Ofenrollen unterhalb des Herdbodens jeweils eine deren Laufflächen angreifende Reinigungsvorrichtung zugeordnet. Hierfür kann beispielsweise jeweils an den Rollenlagern ein messerartiges Stahlband derart federnd befestigt sein, daß unterhalb des Herdbodens die Lauffläche der Ofenrolle ständig an der Messerkante des Stahlbands vorbeistreicht. Dieses Stahlband streicht in der Art eines Rakelmessers jegliche Anbackung von der Lauffläche ab, wonach noch eine feststehende oder rotierende Bürste die Lauffläche endreinigt und/oder vorzugsweise auch eine die Anbackungen weitgehend vermeidende Pulverschicht beispielsweise aus Quarzpulver, Graphit oder Aluminiumoxidpulver aufträgt.In order to largely avoid the formation of the so-called pimples due to accumulated adherence of flaked-off scale particles, according to a development of the invention, the oven rollers below the hearth floor are each assigned a cleaning device attacking their running surfaces. For this purpose, for example, a knife-like steel band can be resiliently fastened to the roller bearings in each case such that the running surface is below the hearth floor the oven roll constantly sweeps past the knife edge of the steel belt. This steel strip, in the manner of a doctor blade, wipes off any caking from the running surface, after which a stationary or rotating brush finally cleans the running surface and / or preferably also applies a powder layer largely avoiding the caking, for example made of quartz powder, graphite or aluminum oxide powder.

Die Ofenrollen sind zweckmäßig an ihren Umfangsflächen mit einer die Lauffläche enthaltenden ringförmigen Ummantelung aus hitzebeständigem Material versehen. Vorzugsweise sind die Ofenrollen mit einem hitzebeständigen Stahl oder mit einer feuerfesten Keramik aus beispielsweise Siliciumcarbid (SiC) oder Zirkonoxid (ZrO₂) ummantelt. Es kann oftmals zweckmäßig sein, die Ofenrollen ganz aus einer entsprechenden feuerfesten Keramik herzustellen.The furnace rollers are expediently provided on their peripheral surfaces with an annular casing made of heat-resistant material and containing the running surface. The furnace rollers are preferably coated with a heat-resistant steel or with a refractory ceramic made of, for example, silicon carbide (SiC) or zirconium oxide (ZrO₂). It can often be expedient to produce the oven rolls entirely from a corresponding refractory ceramic.

Weiterhin wird als vorteilhaft vorgeschlagen, daß die Ofenrollen bzw. mindestens deren die Laufflächen aufweisende Ummantelung aus Segmenten zusammengesetzt sind. Diese Segmente sind bei Beschädigung der Laufflächen bzw. deren wärmebelasteten Rollenabschnitte leicht auszuwechseln. Auch kann durch Zwischenlage von Isoliermaterial zwischen der Ummantelung bzw. deren Segmente und den Ofenrollen-Basisteilen die Wärmeleitung zu den Lagerteilen und weiteren Vorrichtungen des Rollgangs weiterhin verringert werden.Furthermore, it is proposed as advantageous that the furnace rollers or at least their casing having the running surfaces are composed of segments. These segments are easy to replace if the treads or their heat-loaded roller sections are damaged. The thermal conduction to the bearing parts and further devices of the roller table can also be further reduced by interposing insulating material between the casing or its segments and the furnace roller base parts.

Ein Ausführungsbeispiel der Erfindung ist nachstehend beschrieben und anhand der Zeichnungen dargestellt. In den Zeichnungen zeigen:

Figur 1
einen Längsschnitt durch einen Rollenherdofen, und
Figur 2
einen Querschnitt des Ofens nach Figur 1, in vergrößertem Maßstab.

An embodiment of the invention is described below and illustrated with the drawings. The drawings show:
Figure 1
a longitudinal section through a roller hearth furnace, and
Figure 2
a cross section of the furnace of Figure 1, on an enlarged scale.

In den Zeichnungen ist ein insbesondere zum Wärmen von Dünnbrammen geeigneter Rollenherdofen 10 mit üblicher Brennerbeheizung und einem längs durchgehenden Rollgang dargestellt. Dieser Ofen 10 weist einen Oberofenraum 11 und einen Unterofenraum 12 auf, zwischen denen ein Herdboden 13 mit in zwei parallel zueinander verlaufenden Reihen Ausnehmungen 14 angeordnet sind. Die Brenner 15 sind im Oberofenraum 11 beidseitig in den Seitenwänden 16 angeordnet. Der Oberofenraum 11 sitzt direkt auf einem Fundament F, in dessen Raum sich der Unterofenraum 12 erstreckt und der gegen den Fundamentraum F durch Wassertassen 26 abgedichtet ist.In the drawings, a roller hearth furnace 10, which is particularly suitable for heating thin slabs, is shown with conventional burner heating and a longitudinal continuous roller table. This furnace 10 has an upper furnace chamber 11 and a lower furnace chamber 12, between which a hearth 13 with recesses 14 are arranged in two rows running parallel to one another. The burners 15 are arranged in the upper furnace chamber 11 on both sides in the side walls 16. The upper furnace space 11 sits directly on a foundation F, in the space of which the lower furnace space 12 extends and which is sealed against the foundation space F by water cups 26.

Unterhalb des Herdbodens 13 sind in dem unbeheizten Unterofenraum 12 die Ofenrollen 17 des Rollgangs gelagert. Diese Rollen 17 sind radförmig aus Metall mit einer kreiszylindrischen Umfangsfläche und darauf mit einer ringförmigen Ummantelung 18 aus hitzebeständigem Material ausgebildet. Die kreiszylindrische Außenfläche dieser Ummantelung 18 bildet die Lauffläche 19 für den Transport des Wärmguts 20. Diese Ummantelung 18 ist ein aus Segmenten zusammengesetzter Ring, auf dessen Lauffläche 19 als Wärmgut 20 im dargestellten Ausführungsbeispiel Dünnbrammen durch den Ofenraum transportiert werden. Die Segmente der ringförmigen Ummantelung 18 können aus hitzebeständigem Stahl oder aus einem nichtmetallischen Material wie aus feuerfester Keramik hergestellt sein und sind unter Zwischenlage einer dünnen feuerfesten Keramikfasermatte auf die radförmigen Metallrollen 17 befestigt. Wie aus den Zeichnungen hervorgeht, ragen die Ofenrollen 17 in der Transportstellung nur mit einem kleinen Abschnitt ihrer ringförmigen Ummantelung 18 und ihrer Lauffläche 19 in den heißen Oberofenraum 11. Die metallischen Rollen- und Lagerteile verbleiben unterhalb des Herdboden-Niveaus N innerhalb des Unterofenraumes 12 und mit ihren Rollachsen 21 im Fundamentraum F.The oven rollers 17 of the roller table are stored below the hearth floor 13 in the unheated sub-oven space 12. These rollers 17 are wheel-shaped made of metal with a circular cylindrical circumferential surface and thereon with an annular casing 18 made of heat-resistant material. The circular cylindrical outer surface of this casing 18 forms the running surface 19 for the transport of the heating material 20. This covering 18 is a ring composed of segments, on the running surface 19 of which, in the exemplary embodiment shown, thin slabs are transported through the furnace space as heating material 20. The segments of the annular casing 18 can be made of heat-resistant steel or of a non-metallic material be made of refractory ceramic and are attached to the wheel-shaped metal rollers 17 with the interposition of a thin refractory ceramic fiber mat. As can be seen from the drawings, in the transport position the oven rollers 17 only protrude into the hot upper oven space 11 with a small portion of their annular casing 18 and their running surface 19. The metallic roller and bearing parts remain below the hearth level N within the lower oven space 12 and with its roll axes 21 in the foundation room F.

Aus dieser oberen Transportstellung sind die Ofenrollen 17 absenkbar. Hierfür sind deren Achsen 21 in Lagerköpfen eines an sich bekannten Hubwerkes 22 gelagert und gemeinsam vertikal beweglich. Damit können die Ofenrollen 17 im Falle einer Störung im Betriebsablauf aus der dargestellten Lage in eine untere Lage abgesenkt werden, in der sich die Rollen 17 gänzlich unterhalb des Herdboden-Niveaus N befinden. Hierbei ist das Wärmgut 20 bis zur Wiederinbetriebnahme auf dem Herdboden 13 abgelegt.The oven rollers 17 can be lowered from this upper transport position. For this purpose, the axes 21 are mounted in the bearing heads of a hoist 22 known per se and are vertically movable together. In this way, in the event of a malfunction in the operational sequence, the furnace rollers 17 can be lowered from the position shown into a lower position, in which the rollers 17 are located completely below the hearth level N. Here, the heating material 20 is placed on the hearth 13 until it is put back into operation.

Unterhalb des Herdbodens 13 sind den Ofenrollen 17 ferner Reinigungsvorrichtungen 23 zugeordnet, um die Laufflächen 19 von erhabenen Zunder-Anbackungen zu befreien. Jede der Reinigungsvorrichtungen 23 enthält ein Gestell mit einem federnd gelagerten messerartigen Stahlband 24, an dem die Lauffläche 19 der Ofenrollen 17 ständig vorbeistreicht. In Umlaufrichtung ist dahinter eine Bürste 25 befestigt, an der die Lauffläche 19 entlanggleitet. Mit Hilfe dieser Bürste 25 wird die Lauffläche 19 endgereinigt und mit einer dünnen Schicht eines Quarzpulvers oder eines anderen geeigneten Pulvers versehen, mit dem die Zunder-Anbackungen weitgehend vermieden werden können.Below the hearth base 13, the furnace rollers 17 are also assigned cleaning devices 23 in order to free the running surfaces 19 of raised scale deposits. Each of the cleaning devices 23 contains a frame with a resiliently mounted knife-like steel band 24, on which the running surface 19 of the oven rollers 17 constantly passes. In the circumferential direction, a brush 25 is attached behind it, along which the tread 19 slides. With the help of this brush 25, the tread 19 is finally cleaned and provided with a thin layer of a quartz powder or another suitable powder with which the scale deposits can largely be avoided.

Bezugszeichenliste:Reference symbol list:

1010th
OfenraumFurnace room
1111
OberofenraumUpper furnace room
1212
UnterofenraumUnterofenraum
1313
HerdbodenHearth
1414
Ausnehmungen im HerdbodenRecesses in the stove floor
1515
Brennerburner
1616
Oberofen-SeitenwändeUpper furnace side walls
1717th
OfenrollenOven rolls
1818th
UmmantelungSheathing
1919th
LaufflächeTread
2020th
WärmgutHot material
2121
Ofenrollen-AchsenOven roller axes
2222
HubwerkHoist
2323
ReinigungsvorrichtungenCleaning devices
2424th
messerartiges Stahlbandknife-like steel band
2525th
Bürstebrush
2626
WassertasseWater cup
FF
FundamentraumFoundation space
NN
Herdboden-NiveauStove floor level

Claims (7)

1. Roller hearth-type furnace for warming slabs, blocks, billets, plates or similar articles to be warmed whose furnace space is constructed with a longitudinally continuous roller bed, the furnace (10) having an upper furnace space (11) serving as a warming space and a lower furnace space (12), between which is disposed a hearth base (13) with openings (14) for the furnace rollers (17) of the roller bed which are mounted below the hearth base (13) in the space (12, F) below the upper furnace space (11), characterised in that the furnace rollers (17) are mounted so as to be liftable and lowerable in such a manner that in their raised working position they each extend only with a small roller section affording the upper section of their circular cylindrical running surface (19) through one of the openings (14) into the upper furnace space (11) to above the hearth base level (N).
2. Roller hearth-type furnace as claimed in Claim 1, characterised in that associated with the furnace rollers (17) below the hearth base (13) is a cleaning device (23 to 25) engaging their running surfaces (19).
3. Roller hearth-type furnace as claimed in Claim 1 or 2, characterised in that associated with the furnace rollers (17) below the hearth base (13) is a device (25) engaging their running surfaces (19) for the application of a powder layer, preferably of quartz powder, graphite or aluminium oxide powder.
4. Roller hearth-type furnace as claimed in one of Claims 1 to 3, characterised in that the furnace rollers (17) are provided on their peripheral surface with an annular sheathing (18) of heat-resistant material affording the running surface (19).
5. Roller hearth-type furnace as claimed in Claim 4, characterised in that the furnace rollers (17) are sheathed on their peripheral surface with a refractory ceramic.
6. Roller hearth-type furnace as claimed in one of Claims 1 to 5, characterised in that the furnace rollers (17) are manufactured from a refractory ceramic.
7. Roller hearth-type furnace as claimed in one of Claims 1 to 6, characterised in that the furnace rollers (17) or at least their sheathing (18) affording the running surfaces (19) are composed of segments.
EP89102655A 1988-03-05 1989-02-16 Roll hearth furnace for heating slabs, ingots, billets, metal sheets and similar materials Expired - Lifetime EP0331937B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89102655T ATE67025T1 (en) 1988-03-05 1989-02-16 ROLLER HEART FURNACE FOR HEATING SLABS, BLOCKS, BILLETS, SHEET AND SIMILAR HEATING GOODS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3807240 1988-03-05
DE3807240A DE3807240C1 (en) 1988-03-05 1988-03-05

Publications (2)

Publication Number Publication Date
EP0331937A1 EP0331937A1 (en) 1989-09-13
EP0331937B1 true EP0331937B1 (en) 1991-09-04

Family

ID=6348943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89102655A Expired - Lifetime EP0331937B1 (en) 1988-03-05 1989-02-16 Roll hearth furnace for heating slabs, ingots, billets, metal sheets and similar materials

Country Status (5)

Country Link
EP (1) EP0331937B1 (en)
AT (1) ATE67025T1 (en)
DD (1) DD279297A5 (en)
DE (2) DE3807240C1 (en)
ES (1) ES2026706T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10007383B4 (en) * 2000-02-18 2008-06-26 Sms Demag Ag Water-cooled oven roll for conveying workpieces through a reheating oven
CN103322824B (en) * 2012-03-22 2015-06-17 宝山钢铁股份有限公司 Treating method of furnace roller nodule
DE102014224445A1 (en) 2014-11-28 2016-06-02 Schmidt + Clemens Gmbh & Co. Kg Uncooled oven roll, and method of making an uncooled oven roll

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR512892A (en) * 1920-04-01 1921-02-02 Anciens Etablissements Chavann Annealing furnace
FR596680A (en) * 1925-03-25 1925-10-29 Ac Spark Plug Co Method and apparatus for firing ceramic objects
DE523525C (en) * 1929-11-08 1931-04-27 Poetter G M B H Conveyor device for ovens for heat treatment of metals
GB521003A (en) * 1938-11-08 1940-05-09 Sankey Joseph & Sons Ltd Improvements in furnaces for use in heat treatment of articles or in heating articles for subsequent operations
US2663558A (en) * 1949-01-21 1953-12-22 Blaw Knox Co Furnace conveyer element
US2788957A (en) * 1953-03-30 1957-04-16 Drever Co Refractory roller furnace conveyor system
DE1232997B (en) * 1963-05-09 1967-01-26 Ofu Ofenbau Union G M B H Roller hearth for a roller hearth furnace for the heat treatment of, in particular, metallic goods

Also Published As

Publication number Publication date
ATE67025T1 (en) 1991-09-15
DE58900247D1 (en) 1991-10-10
EP0331937A1 (en) 1989-09-13
DD279297A5 (en) 1990-05-30
DE3807240C1 (en) 1989-06-01
ES2026706T3 (en) 1992-05-01

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