EP2540406B1 - Method for operating a roller conveyor for transporting a milled product and heating system for such a roller conveyor - Google Patents

Method for operating a roller conveyor for transporting a milled product and heating system for such a roller conveyor Download PDF

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Publication number
EP2540406B1
EP2540406B1 EP11171491.1A EP11171491A EP2540406B1 EP 2540406 B1 EP2540406 B1 EP 2540406B1 EP 11171491 A EP11171491 A EP 11171491A EP 2540406 B1 EP2540406 B1 EP 2540406B1
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EP
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Prior art keywords
heating
roller conveyor
cover plates
lower side
milled product
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EP11171491.1A
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German (de)
French (fr)
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EP2540406A1 (en
Inventor
Birger Schmidt
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Siemens AG
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Siemens AG
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Priority to PL11171491T priority Critical patent/PL2540406T3/en
Priority to EP11171491.1A priority patent/EP2540406B1/en
Priority to CN2012203052254U priority patent/CN203197007U/en
Publication of EP2540406A1 publication Critical patent/EP2540406A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills

Definitions

  • the invention relates to a method for operating a roller table for transporting a rolling stock, in particular a hot rolling, along a rolling train.
  • the invention further relates to a heating system for such a roller table.
  • the preambles of claims 1 and 6 are based on the DE 1602097 ,
  • roller tables The transport of a rolling stock in rolling mills is usually done by means of roller tables.
  • a roller table comprises several successively arranged, driven rollers. Since the edges of the rolling stock are not always plane-parallel during the production process and in particular the head and the foot of the rolling stock may have ski-shaped curvatures, there is a risk that the rolling interlocked between the roller conveyor rollers, so that it comes to congestion in the production process.
  • cover plates are arranged between the roller table rollers. In addition, the cover plates have the function of protecting the roller table rollers against shock loading.
  • the rolling stock transported over the roller table rollers and the intermediate cover plates they are exposed to the heat radiation through the rolling stock.
  • the heat radiation hits both the roller table rollers and the cover plates on one side, from the top, since this side faces the rolling stock.
  • the roller table rollers can distribute the heat load symmetrically by their rotation, the cover plates heat on one side, from above.
  • the cover plates expand more than at the bottom due to the one-sided heating at the top and bend thereby to the side of the heat input.
  • the longer the heat input takes in the cover plates the stronger the deflection of the cover plates. This can be so strong that the rolling stock is lifted by the roller table rollers. If the rolling stock reaches such a strongly bent cover plate, it can not be easily transported further.
  • the deflection of the cover plates can thus be the cause of a longer traffic jam in the rolling train.
  • Sheet metal rolling mills which have predominantly thermomechanically rolled, are usually provided with extra cooling stations outside of the roller tracks.
  • the invention has for its object to enable a stable and proper operation of a rolling mill, in particular a rolling mill in a heavy plate mill, during the thermomechanical rolling of a rolling stock.
  • the object is achieved by a method for operating a roller table for transporting a rolling stock, in particular a hot rolling, along a rolling line, wherein the roller table comprises a plurality of roller table rollers and arranged between the roller table cover plates, wherein a rolling away the lower side of the cover plates is heated.
  • a heating system for a roller conveyor for transporting a rolling stock, in particular a hot rolling, along a rolling train the roller table has a plurality of roller table rollers and arranged between the roller table cover plates, comprising a heater for heating a lower side facing away from the rolling stock the cover plates.
  • the invention is based on the idea of also heating the lower side of the cover plates, so that the lower side also expands and the curvature of the cover plates, caused by the heat radiation from the rolling stock, goes back.
  • a uniform heat input on the upper and on the lower side of the cover plates occurs in the longitudinal direction and in the transverse direction of the cover plates. Due to the symmetrical heat distribution in the cover plates, the deflection is prevented. If necessary, the lower side of the cover plate can be heated more than the upper side, so that the deflection is reversed.
  • the deflection of the cover plates is measured by means of suitable measuring devices and the heating of the lower side is controlled or regulated as a function of the deflection of the cover plate.
  • a proximity switch is provided, which operates without contact.
  • Such a sensor is, for example, positioned centrally below the cover plate and measures the distance to the cover plate by indicating whether the cover plate is within a certain distance.
  • the heater for the lower side of the cover plate is turned on and vice versa. This ensures that the deflection is counteracted online and in real time.
  • the method is characterized by a high degree of flexibility in that the heating of the individual cover plates of the roller table is controlled or regulated decoupled from each other. This means that the deflection, in particular of each individual plate, is determined and in dependence of this deflection the heating process for the respective plate is controlled separately.
  • the cover plates are heated by means of heating coil or induction devices.
  • a heating coil is provided on the lower side of the cover plate, which is thermally insulated downwards so that it radiates its heat "upwards" to the cover plate.
  • the ends of the cover plates are less heated during operation of the rolling mill than the center of the cover plates. This is taken into account in the method of operation of the roller table by varying the heat input on the lower side of the cover plates over a length of the lower side. This ensures that the same temperature profile is set on the lower side as on the upper side of the respective cover plate.
  • FIG. 1 goes a part of a roller table 2 for transporting a rolling stock 4 (see FIGS. 2 to 5 ) in a transport direction 6 forth.
  • the rolling stock 4 is in particular a sheet or a plate, which is thermomechanically rolled by means of a rolling train not shown in detail.
  • the roller table 2 comprises several, in the transport direction 6 successively arranged roller table rollers 8, which rotate in the same direction about their axes. So that the rolling stock 4 does not get stuck between the roller table rollers 8, a cover plate 10 (English: apron plate) made of steel is provided between each two adjacent roller table rollers 8. Each cover plate 10 has an upper side 12, which faces the rolling stock 4 during operation, and an opposite lower side 14 facing away from the rolling stock 4. The upper side 12 and the lower side 14 are connected to each other by means of a carrier 16 or frame.
  • the cover plates 10 have the shape of a double-T-beam, alternatively, it may be sheet metal plates which are reinforced from below by means of a frame or the cover plates 10 may have round or rectangular profiles with spacers.
  • roller table rollers 8 and the cover plates 10 are exposed to heat radiation of the rolling stock 4. By their rotation, the roller table rollers 8 distribute this heat load symmetrically around its circumference. In contrast to the roller table rollers 8, however, the heat load in the cover plate 10 occurs only on one side. This situation is in FIG. 3 shown.
  • the carrier 16 bends towards the upper side 12 of the cover plate 10, as is apparent FIG. 4 is apparent. With an extremely strong deflection of the cover plate 10, it may happen that the cover plate 10 raises the rolling stock 4 via the roller table rollers 8. In this case, a trouble-free transport of the rolling stock 4 is no longer guaranteed and can lead to congestion of the rolling stock 4.
  • a heating system 17 is provided, which in the embodiment shown heating devices 18, a control or regulating device 20 and measuring devices (22, see FIG. 3 ) for measuring the distance to the cover plate 10 and thus the deflection of the cover plate 10 in operation comprises.
  • the heating device 18 is designed, for example, in the manner of one or more induction devices or heating spirals.
  • the heating device 18 is controlled by a control or regulating device 20.
  • a measuring signal M of the measuring devices 22 is supplied to the control or regulating device 20.
  • the control or regulating device 20 sends a control signal S to the heating device 18.
  • the heat input for the lower side 14 is varied over the length of the cover plate 10 and in particular over the length L of the lower side 14, so that set a temperature profile corresponding to the temperature profile on the upper side 12.
  • Each cover plate 10 of the roller table 2 is associated in particular with its own heating device 18. However, it is also conceivable that a plurality of cover plates 10 are heated by a heating device 18. The individual heaters 18 are thereby controlled separately by the control and regulating device 20.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Induction Heating (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Betrieb eines Rollganges zum Transportieren eines Walzgutes, insbesondere eines Warmwalzgutes, entlang einer Walzstraße. Die Erfindung betrifft weiterhin ein Aufheizsystem für einen solchen Rollgang. Die Oberbegriffe der Ansprüche 1 und 6 basieren auf der DE 1602097 .The invention relates to a method for operating a roller table for transporting a rolling stock, in particular a hot rolling, along a rolling train. The invention further relates to a heating system for such a roller table. The preambles of claims 1 and 6 are based on the DE 1602097 ,

Der Transport eines Walzgutes in Walzstraßen erfolgt in der Regel mittels Rollgänge. Ein solcher Rollgang umfasst mehrere hintereinander angeordnete, angetriebene Rollen. Da die Kanten des Walzgutes während des Produktionsprozesses nicht immer planparallel sind und insbesondere der Kopf und der Fuß des Walzgutes ski-förmigen Krümmungen aufweisen können, besteht die Gefahr, dass das Walzgut sich zwischen den Rollgangsrollen verhakt, so dass es zu Stauungen im Produktionsprozess kommt. Um diese Stauungen zu vermeiden, sind zwischen den Rollgangsrollen Abdeckplatten angeordnet. Die Abdeckplatten haben zusätzlich die Funktion die Rollgangsrollen vor Stoßbelastung zu schützen.The transport of a rolling stock in rolling mills is usually done by means of roller tables. Such a roller table comprises several successively arranged, driven rollers. Since the edges of the rolling stock are not always plane-parallel during the production process and in particular the head and the foot of the rolling stock may have ski-shaped curvatures, there is a risk that the rolling interlocked between the roller conveyor rollers, so that it comes to congestion in the production process. In order to avoid these stagnation, cover plates are arranged between the roller table rollers. In addition, the cover plates have the function of protecting the roller table rollers against shock loading.

Wird das Walzgut über die Rollgangsrollen und die dazwischen liegenden Abdeckplatten transportiert, sind diese der Wärmestrahlung durch das Walzgut ausgesetzt. Die Wärmestrahlung trifft sowohl die Rollgangsrollen als auch die Abdeckplatten einseitig, und zwar von oben, da diese Seite dem Walzgut zugewandt ist. Während die Rollgangsrollen durch ihre Drehung die Wärmelast symmetrisch verteilen können, heizen sich die Abdeckplatten einseitig, von oben auf. Die Abdeckplatten dehnen sich aufgrund der einseitigen Erwärmung an der Oberseite stärker als an der Unterseite und biegen sich dabei zur Seite des Wärmeeintrages. Je länger der Wärmeeintrag in die Abdeckplatten dauert, umso stärker ist auch die Durchbiegung der Abdeckplatten. Diese kann so stark sein, dass das Walzgut von den Rollgangsrollen gehoben wird. Wenn das Walzgut eine solche stark durchgebogene Abdeckplatte erreicht, kann es nicht problemlos weitertransportiert werden. Die Durchbiegung der Abdeckplatten kann somit die Ursache für einen längeren Stau in der Walzstraße sein.If the rolling stock transported over the roller table rollers and the intermediate cover plates, they are exposed to the heat radiation through the rolling stock. The heat radiation hits both the roller table rollers and the cover plates on one side, from the top, since this side faces the rolling stock. While the roller table rollers can distribute the heat load symmetrically by their rotation, the cover plates heat on one side, from above. The cover plates expand more than at the bottom due to the one-sided heating at the top and bend thereby to the side of the heat input. The longer the heat input takes in the cover plates, the stronger the deflection of the cover plates. This can be so strong that the rolling stock is lifted by the roller table rollers. If the rolling stock reaches such a strongly bent cover plate, it can not be easily transported further. The deflection of the cover plates can thus be the cause of a longer traffic jam in the rolling train.

Dieses Problem wurde bisher nicht zufriedenstellend gelöst. Blechwalzwerke, die überwiegend thermomechanisch gewalzt haben, sind in der Regel mit extra Kühlplätzen außerhalb der Rollengänge versehen.This problem has not been solved satisfactorily. Sheet metal rolling mills, which have predominantly thermomechanically rolled, are usually provided with extra cooling stations outside of the roller tracks.

Der Erfindung liegt die Aufgabe zugrunde, einen stabilen und einwandfreien Betrieb einer Walzstraße, insbesondere einer Walzstraße in einem Grobblechwalzwerk, beim thermomechanischen Walzen eines Walzgutes zu ermöglichen.The invention has for its object to enable a stable and proper operation of a rolling mill, in particular a rolling mill in a heavy plate mill, during the thermomechanical rolling of a rolling stock.

Die Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren zum Betrieb eines Rollganges zum Transportieren eines Walzgutes, insbesondere eines Warmwalzgutes, entlang einer Walzstraße, wobei der Rollgang mehrere Rollgangsrollen und zwischen den Rollgangsrollen angeordnete Abdeckplatten umfasst, wobei eine dem Walzgut abgewandte untere Seite der Abdeckplatten aufgeheizt wird.The object is achieved by a method for operating a roller table for transporting a rolling stock, in particular a hot rolling, along a rolling line, wherein the roller table comprises a plurality of roller table rollers and arranged between the roller table cover plates, wherein a rolling away the lower side of the cover plates is heated.

Die Aufgabe wird weiterhin erfindungsgemäß gelöst durch ein Aufheizsystem für einen Rollgang zum Transportieren eines Walzgutes, insbesondere eines Warmwalzgutes, entlang einer Walzstraße, wobei der Rollgang mehrere Rollgangsrollen und zwischen den Rollgangsrollen angeordnete Abdeckplatten aufweist, umfassend eine Heizvorrichtung zum Erhitzen einer unteren, dem Walzgut abgewandten Seite der Abdeckplatten. Die in Bezug auf das Verfahren nachstehend aufgeführten Vorteile und bevorzugten Ausgestaltungen sind sinngemäß auf das Aufheizsystem zu übertragen.The object is further achieved according to the invention by a heating system for a roller conveyor for transporting a rolling stock, in particular a hot rolling, along a rolling train, the roller table has a plurality of roller table rollers and arranged between the roller table cover plates, comprising a heater for heating a lower side facing away from the rolling stock the cover plates. The advantages and preferred embodiments listed below with regard to the method are to be transferred analogously to the heating system.

Die Erfindung basiert auf der Idee, die untere Seite der Abdeckplatten ebenfalls aufzuheizen, damit sich die untere Seite ebenfalls ausdehnt und die Krümmung der Abdeckplatten, verursacht durch die Wärmestrahlung vom Walzgut, zurückgeht. Es erfolgt dabei insbesondere ein in Längs- und in Querrichtung der Abdeckplatten gleichmäßiger Wärmeeintrag auf der oberen als auch auf der unteren Seite der Abdeckplatten. Durch die symmetrische Wärmeverteilung in den Abdeckplatten wird der Durchbiegung vorgebeugt. Falls erforderlich, kann die untere Seite der Abdeckplatte stärker aufgeheizt werden als die obere Seite, so dass die Durchbiegung umgekehrt wird.The invention is based on the idea of also heating the lower side of the cover plates, so that the lower side also expands and the curvature of the cover plates, caused by the heat radiation from the rolling stock, goes back. In particular, a uniform heat input on the upper and on the lower side of the cover plates occurs in the longitudinal direction and in the transverse direction of the cover plates. Due to the symmetrical heat distribution in the cover plates, the deflection is prevented. If necessary, the lower side of the cover plate can be heated more than the upper side, so that the deflection is reversed.

Gemäß einer bevorzugten Variante wird die Durchbiegung der Abdeckplatten mit Hilfe von geeigneten Messvorrichtungen gemessen und das Aufheizen der unteren Seite wird in Abhängigkeit der Durchbiegung der Abdeckplatte gesteuert oder geregelt. Zur Messung der Durchbiegung ist insbesondere ein Näherungsschalter vorgesehen, der berührungslos arbeitet. Ein derartiger Sensor ist beispielsweise mittig etwas unterhalb der Abdeckplatte positioniert und misst den Abstand zur Abdeckplatte, indem er anzeigt, ob sich Abdeckplatte innerhalb eines bestimmten Abstandes befindet. Wenn die Abdeckplatte sich aus dem Arbeitsbereich des Näherungsschalters wegbewegt, wird die Heizung für die untere Seite der Abdeckplatte eingeschaltet und umgekehrt. Somit wird gewährleistet, dass der Durchbiegung online und in Echtzeit entgegengewirkt wird. Alternativ oder erganzend kann auch die Möglichkeit gegeben sein, die Heizung für die Abdeckplatte manuell ein- bzw. auszuschalten, wenn ein Operator merkt, dass es Probleme mit dem Transport des Warmwalzgutes gibt.According to a preferred variant, the deflection of the cover plates is measured by means of suitable measuring devices and the heating of the lower side is controlled or regulated as a function of the deflection of the cover plate. For measuring the deflection, in particular a proximity switch is provided, which operates without contact. Such a sensor is, for example, positioned centrally below the cover plate and measures the distance to the cover plate by indicating whether the cover plate is within a certain distance. When the cover plate moves away from the working area of the proximity switch, the heater for the lower side of the cover plate is turned on and vice versa. This ensures that the deflection is counteracted online and in real time. Alternatively or in addition, it is also possible to manually switch the heating for the cover plate on or off when an operator realizes that there are problems with the transport of the hot rolling stock.

Das Verfahren zeichnet sich durch eine hohe Flexibilität aus, indem die Aufheizung der einzelnen Abdeckplatten des Rollganges voneinander entkoppelt gesteuert oder geregelt wird. Dies bedeutet, dass die Durchbiegung, insbesondere jeder einzelnen Platte, ermittelt wird und in Abhängigkeit dieser Durchbiegung der Aufheizvorgang für die jeweilige Platte separat angesteuert wird.The method is characterized by a high degree of flexibility in that the heating of the individual cover plates of the roller table is controlled or regulated decoupled from each other. This means that the deflection, in particular of each individual plate, is determined and in dependence of this deflection the heating process for the respective plate is controlled separately.

Vorteilhafterweise werden die Abdeckplatten mittels Heizwendel oder Induktionsgeräte aufgeheizt. Beispielsweise ist an der unteren Seite der Abdeckplatte eine Heizwendel vorgesehen, die thermisch nach unten isoliert ist, so dass sie ihre Wärme "nach oben" zur Abdeckplatte hin strahlt.Advantageously, the cover plates are heated by means of heating coil or induction devices. For example, a heating coil is provided on the lower side of the cover plate, which is thermally insulated downwards so that it radiates its heat "upwards" to the cover plate.

Die Enden der Abdeckplatten werden im Betrieb der Walzstraße weniger stark erhitzt als die Mitte der Abdeckplatten. Dies wird beim Verfahren zum Betrieb des Rollganges berücksichtigt, indem der Wärmeeintrag an der unteren Seite der Abdeckplatten über eine Länge der unteren Seite variiert wird. Somit wird gewährleistet, dass sich an der unteren Seite das gleiche Temperaturprofil einstellt wie an der oberen Seite der jeweiligen Abdeckplatte.The ends of the cover plates are less heated during operation of the rolling mill than the center of the cover plates. This is taken into account in the method of operation of the roller table by varying the heat input on the lower side of the cover plates over a length of the lower side. This ensures that the same temperature profile is set on the lower side as on the upper side of the respective cover plate.

Ein Ausführungsbeispiel der Erfindung wird anhand einer Zeichnung näher erläutert. Hierin zeigen schematisch und stark vereinfacht:

FIG 1
in einer perspektivischen Darstellung eine Abdeckplatte zwischen zwei Rollgangsrollen,
FIG 2
schematisch in einem Schnitt in einer Transportrichtung den Transport eines Walzgutes über einen Rollgang,
FIG 3
in einer Darstellung quer zur Transportrichtung ein einseitiges Aufheizen einer Abdeckplatte,
FIG 4
in einer Darstellung quer zur Transportrichtung eine Durchbiegung der Abdeckplatte gemäß FIG 3 unter der Wärmelast des Walzgutes, und
FIG 5
in einer Darstellung quer zur Transportrichtung eine Kompensation der Durchbiegung der Abdeckplatte gemäß FIG 4.
An embodiment of the invention will be explained in more detail with reference to a drawing. Herein schematically and greatly simplified show:
FIG. 1
in a perspective view, a cover plate between two roller conveyor rollers,
FIG. 2
schematically in a section in a transport direction the transport of a rolling stock over a roller table,
FIG. 3
in a representation transversely to the transport direction, a one-sided heating of a cover plate,
FIG. 4
in a representation transversely to the transport direction according to a deflection of the cover plate FIG. 3 under the heat load of the rolling stock, and
FIG. 5
in a representation transverse to the transport direction compensation of the deflection of the cover plate according to FIG. 4 ,

Gleiche Bezugszeichen haben in den verschiedenen Figuren die gleiche Bedeutung.Like reference numerals have the same meaning in the various figures.

Aus FIG 1 geht ein Teil eines Rollganges 2 zum Transportieren eines Walzgutes 4 (siehe Figuren 2 bis 5) in eine Transportrichtung 6 hervor. Das Walzgut 4 ist insbesondere ein Blech oder eine Platte, die mittels einer nicht näher gezeigten Walzstrasse thermomechanisch gewalzt wird.Out FIG. 1 goes a part of a roller table 2 for transporting a rolling stock 4 (see FIGS. 2 to 5 ) in a transport direction 6 forth. The rolling stock 4 is in particular a sheet or a plate, which is thermomechanically rolled by means of a rolling train not shown in detail.

Der Rollgang 2 umfasst mehrere, in Transportrichtung 6 hintereinander angeordnete Rollgangsrollen 8, die sich in die gleiche Richtung um ihre Achsen drehen. Damit das Walzgut 4 nicht zwischen den Rollgangsrollen 8 stecken bleibt, ist zwischen je zwei benachbarten Rollgangsrollen 8 eine Abdeckplatte 10 (Englisch: Apron Plate) aus Stahl vorgesehen. Jede Abdeckplatte 10 weist eine obere Seite 12, die im Betrieb dem Walzgut 4 zugewandt ist, und eine gegenüberliegende, dem Walzgut 4 abgewandte untere Seite 14 auf. Die obere Seite 12 und die untere Seite 14 sind mittels eines Trägers 16 oder Rahmens miteinander verbunden. Im gezeigten Ausführungsbeispiel haben die Abdeckplatten 10 die Form eines Doppel-T-Trägers, alternativ können es Blechplatten sein, die von unten mittels eines Rahmens verstärkt sind oder die Abdeckplatten 10 können Rund- oder Rechteckprofile mit Abstandshaltern aufweisen.The roller table 2 comprises several, in the transport direction 6 successively arranged roller table rollers 8, which rotate in the same direction about their axes. So that the rolling stock 4 does not get stuck between the roller table rollers 8, a cover plate 10 (English: apron plate) made of steel is provided between each two adjacent roller table rollers 8. Each cover plate 10 has an upper side 12, which faces the rolling stock 4 during operation, and an opposite lower side 14 facing away from the rolling stock 4. The upper side 12 and the lower side 14 are connected to each other by means of a carrier 16 or frame. In the illustrated embodiment, the cover plates 10 have the shape of a double-T-beam, alternatively, it may be sheet metal plates which are reinforced from below by means of a frame or the cover plates 10 may have round or rectangular profiles with spacers.

Sowohl die Rollgangsrollen 8 als auch die Abdeckplatten 10 sind einer Wärmestrahlung des Walzgutes 4 ausgesetzt. Durch ihre Drehung verteilen die Rollgangsrollen 8 diese Wärmelast symmetrisch um ihren Umfang. Im Gegensatz zu den Rollgangsrollen 8 tritt die Wärmelast in die Abdeckplatte 10 jedoch nur einseitig ein. Diese Situation ist in FIG 3 gezeigt.Both the roller table rollers 8 and the cover plates 10 are exposed to heat radiation of the rolling stock 4. By their rotation, the roller table rollers 8 distribute this heat load symmetrically around its circumference. In contrast to the roller table rollers 8, however, the heat load in the cover plate 10 occurs only on one side. This situation is in FIG. 3 shown.

Aufgrund der einseitigen Erwärmung biegt sich der Träger 16 zur oberen Seite 12 der Abdeckplatte 10 hin, wie dies aus FIG 4 ersichtlich ist. Bei einer extrem starken Durchbiegung der Abdeckplatte 10 kann es dabei vorkommen, dass die Abdeckplatte 10 das Walzgut 4 über den Rollgangsrollen 8 anhebt. In diesem Fall ist ein störungsfreier Transport des Walzgutes 4 nicht mehr gewährleistet und des kann zu Stauungen der Walzgüter 4 kommen.Due to the one-sided heating, the carrier 16 bends towards the upper side 12 of the cover plate 10, as is apparent FIG. 4 is apparent. With an extremely strong deflection of the cover plate 10, it may happen that the cover plate 10 raises the rolling stock 4 via the roller table rollers 8. In this case, a trouble-free transport of the rolling stock 4 is no longer guaranteed and can lead to congestion of the rolling stock 4.

Eine derartige Durchbiegung der Abdeckplatte 4 wird kompensiert, indem die untere Seite 14 ebenfalls aufgeheizt wird. Hierfür ist ein Aufheizsystem 17 vorgesehen, das im gezeigten Ausführungsbeispiel Heizvorrichtungen 18, eine Steuer- oder Regelvorrichtung 20 sowie Messvorrichtungen (22, siehe FIG 3) zum Messen des Abstandes zur Abdeckplatte 10 und somit der Durchbiegung der Abdeckplatte 10 im Betrieb umfasst. Die Heizvorrichtung 18 ist beispielsweise nach Art eines oder mehrerer Induktionsgeräte oder Heizspiralen ausgebildet. Die Heizvorrichtung 18 wird von einer Steuer- oder Regelvorrichtung 20 angesteuert. Ein Messsignal M der Messvorrichtungen 22 wird der Steuer- oder Regelvorrichtung 20 zugeführt. Unter Berücksichtigung des Messsignals M sendet die Steuer- oder Regelvorrichtung 20 ein Steuersignal S an die Heizvorrichtung 18. Der Wärmeeintrag für die untere Seite 14 wird dabei über die Länge der Abdeckplatte 10 und insbesondere über die Länge L der unteren Seite 14 variiert, so dass sich ein Temperaturprofil einstellt, das dem Temperaturprofil an der oberen Seite 12 entspricht.Such a deflection of the cover plate 4 is compensated by the lower side 14 is also heated. For this purpose, a heating system 17 is provided, which in the embodiment shown heating devices 18, a control or regulating device 20 and measuring devices (22, see FIG. 3 ) for measuring the distance to the cover plate 10 and thus the deflection of the cover plate 10 in operation comprises. The heating device 18 is designed, for example, in the manner of one or more induction devices or heating spirals. The heating device 18 is controlled by a control or regulating device 20. A measuring signal M of the measuring devices 22 is supplied to the control or regulating device 20. Taking into account the measurement signal M, the control or regulating device 20 sends a control signal S to the heating device 18. The heat input for the lower side 14 is varied over the length of the cover plate 10 and in particular over the length L of the lower side 14, so that set a temperature profile corresponding to the temperature profile on the upper side 12.

Jeder Abdeckplatte 10 des Rollganges 2 ist insbesondere eine eigene Heizvorrichtung 18 zugeordnet. Denkbar ist jedoch auch, dass mehrere Abdeckplatten 10 durch eine Heizvorrichtung 18 aufgeheizt werden. Die einzelnen Heizvorrichtungen 18 werden dabei von der Steuer- und Regelvorrichtung 20 separat angesteuert.Each cover plate 10 of the roller table 2 is associated in particular with its own heating device 18. However, it is also conceivable that a plurality of cover plates 10 are heated by a heating device 18. The individual heaters 18 are thereby controlled separately by the control and regulating device 20.

Durch einen kontrollierten Wärmeeintrag an der unteren Seite 14 der Abdeckplatte 10 wird somit eine Durchbiegung der Abdeckplatte 10 im Betrieb entgegengewirkt, so dass die Abdeckplatte 10 in ihrer ursprünglichen Form und Position bleibt. Dadurch werden Störungen im Betrieb des Rollganges 2, die insbesondere zu Stauungen auf dem Rollgang 2 führen, vermieden.By a controlled heat input to the lower side 14 of the cover plate 10 thus a deflection of the cover plate 10 is counteracted during operation, so that the cover plate 10 remains in its original shape and position. As a result, disturbances in the operation of the roller table 2, which lead in particular to congestion on the roller table 2, avoided.

Claims (10)

  1. Method for operating a roller conveyor (2) for transporting a milled product (4), in particular a heated milled product, along a rolling mill, wherein the roller conveyor (2) includes a number of roller conveyor rollers (7) and cover plates (10) arranged between the roller conveyor rollers (8), characterised in that a lower side (14) of the cover plates (10) facing away from the milled product (4) is heated.
  2. Method according to claim 1,
    wherein a bend in the cover plates (10) is measured and the heating up of the lower side (14) is controlled or regulated as a function of the bend.
  3. Method according to one of the preceding claims,
    wherein the heating of the individual cover plates (10) of the roller conveyor (2) is controlled or regulated decoupled from one another.
  4. Method according to one of the preceding claims, wherein the cover plates (10) are heated by means of heating coils or induction heating devices.
  5. Method according to one of the preceding claims,
    wherein a heat input on the lower side (14) is varied across the length (L) of the lower side (14).
  6. Heating system (17) for a roller conveyor for transporting a milled product (4), in particular a heated milled product, along a rolling mill, wherein the roller conveyor (2) comprises a number of roller conveyor rollers and cover plates (10) arranged between the roller conveyor rollers, characterised by heating apparatuses (18) for heating a lower side (14) of the cover plates (10) facing away from the milled product.
  7. Heating system (17) according to claim 6,
    including measuring apparatuses (22) for measuring a bend in the cover plates (10).
  8. Heating system (17) according to claim 6 or 7,
    including a control or regulating apparatus (20) which is embodied so as to control or regulate the heating of the individual cover plates (10) of the roller conveyor (2) decoupled from one another.
  9. Heating system (17) according to one of claims 6 to 8, wherein the heating apparatuses (18) are embodied in the manner of heating coils or induction heating devices.
  10. Heating system according to one of claims 6 to 9, wherein the heating apparatuses (18) are embodied so as to vary a heat entry on the lower side (14) across a length (L) of the lower side (14).
EP11171491.1A 2011-06-27 2011-06-27 Method for operating a roller conveyor for transporting a milled product and heating system for such a roller conveyor Active EP2540406B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL11171491T PL2540406T3 (en) 2011-06-27 2011-06-27 Method for operating a roller conveyor for transporting a milled product and heating system for such a roller conveyor
EP11171491.1A EP2540406B1 (en) 2011-06-27 2011-06-27 Method for operating a roller conveyor for transporting a milled product and heating system for such a roller conveyor
CN2012203052254U CN203197007U (en) 2011-06-27 2012-06-27 Heating system used for roller table conveying rolled piece along rolling train

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11171491.1A EP2540406B1 (en) 2011-06-27 2011-06-27 Method for operating a roller conveyor for transporting a milled product and heating system for such a roller conveyor

Publications (2)

Publication Number Publication Date
EP2540406A1 EP2540406A1 (en) 2013-01-02
EP2540406B1 true EP2540406B1 (en) 2013-09-18

Family

ID=44583958

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11171491.1A Active EP2540406B1 (en) 2011-06-27 2011-06-27 Method for operating a roller conveyor for transporting a milled product and heating system for such a roller conveyor

Country Status (3)

Country Link
EP (1) EP2540406B1 (en)
CN (1) CN203197007U (en)
PL (1) PL2540406T3 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1602097A1 (en) * 1967-04-05 1970-04-02 Kloeckner Werke Ag Roller table
GB9510740D0 (en) * 1995-05-26 1995-07-19 Encomech Eng Services Heat shields

Also Published As

Publication number Publication date
PL2540406T3 (en) 2014-02-28
EP2540406A1 (en) 2013-01-02
CN203197007U (en) 2013-09-18

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