EP0062697B1 - Process and walking-beam furnace for the heating of products used in ferrous metallurgy - Google Patents

Process and walking-beam furnace for the heating of products used in ferrous metallurgy Download PDF

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Publication number
EP0062697B1
EP0062697B1 EP81108909A EP81108909A EP0062697B1 EP 0062697 B1 EP0062697 B1 EP 0062697B1 EP 81108909 A EP81108909 A EP 81108909A EP 81108909 A EP81108909 A EP 81108909A EP 0062697 B1 EP0062697 B1 EP 0062697B1
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EP
European Patent Office
Prior art keywords
furnace
conveyor
walking beam
products
inlet
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Expired
Application number
EP81108909A
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German (de)
French (fr)
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EP0062697A3 (en
EP0062697A2 (en
Inventor
Iacopo Dr. Ing. Martini
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Italimpianti SpA
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Italimpianti SpA
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Priority to AT81108909T priority Critical patent/ATE22171T1/en
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Publication of EP0062697A3 publication Critical patent/EP0062697A3/en
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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
    • F27B9/201—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 walking beam furnace
    • F27B9/202—Conveyor mechanisms therefor
    • F27B9/207—Conveyor mechanisms therefor consisting of two or more conveyors

Definitions

  • the invention relates to a method for heating iron and steel products of different types and / or starting temperature in walking beam furnaces, and a walking beam furnace for carrying out the method.
  • iron and steel products billets, slabs, blocks and. Like understood.
  • the improvement in the quality of the products obtained by the continuous casting process makes it possible in many cases to refrain from checking these products.
  • This control requires the products to cool to temperatures close to room temperature.
  • This simplification also offers the option, which is very favorable from the point of view of energy saving, of charging the heating and equalizing furnaces with products which are still warm and are fed directly from the continuous casting installation.
  • the possibility of loading the furnaces with these products is prevented, however, by the fact that the known walking beam furnaces are designed to accommodate products with essentially the same furnace inlet temperatures.
  • the products which enter the known furnaces at a temperature which differs significantly from the average temperature therefore leave the furnace at a temperature which is lower than the temperature required for the rolling process, or are heated to an unacceptably high degree and begin to melt.
  • the operation of the rolling mill provided in connection with the walking beam heating furnace had to be adapted to the operation of the continuous casting plant in such a way that the hot products reach the furnace without stays of varying duration and consequently without cooling to different degrees.
  • the object of the present invention is to eliminate the disadvantages mentioned above and to provide a method for heating. of iron and steel products in walking beam furnaces, which makes it possible to load the furnace with successive products with different heating characteristics and still obtain heated products at the outlet of the furnace to a substantially uniform temperature suitable for the rolling process.
  • the collective term “heating characteristic” is understood to mean the identification of the iron and steel products, which is composed of the temperature and / or the cross section, in particular the thickness, and / or the quality.
  • the invention provides a walking beam furnace, which is essentially characterized in that it has a plurality of lateral furnace inlet openings which follow one another in the longitudinal direction of the furnace and / or a plurality of lateral furnace outlet openings which follow one another in the longitudinal direction of the furnace, and on at least one side of the furnace
  • an oven-external conveyor which extends in the longitudinal direction of the oven, is provided for the products, which is synchronized with or matched to the oven-internal walking beam conveyor and the products in the same direction and with the feeds the same speed of the furnace-internal walking beam conveyor, with insertion means for introducing the products into the furnace through any of the lateral furnace inlet openings and for transferring the products from the furnace-outside conveyor onto the furnace-inside walking beam Conveyors and /
  • the walking beam furnace can be designed in various ways with an external, synchronous conveyor assigned according to the invention.
  • a plurality of successive, lateral oven openings assigned conveyor can only be provided on the oven inlet side or only on the oven outlet side or both on the oven inlet side and on the oven outlet side.
  • Lateral oven inlet or outlet openings can be designed in such a way that they only allow one product to pass through at a time, or can be of such a width that each of them allows the entry into the oven and / or the outlet from the oven of one product in several , various positions offset in the longitudinal direction of the furnace.
  • even a single, lateral furnace inlet opening and / or a single lateral furnace outlet opening can be provided, which extends over the entire length of the assigned furnace outer conveyor.
  • the furnace outer conveyor consists of a step conveyor, in particular of a walking beam conveyor, which is designed similarly to the inside walking beam conveyor.
  • the insertion means for introducing the products from the lateral oven-outer conveyor into the oven and / or the ejection means for pushing the products out of the oven onto the lateral oven-outer conveyor can consist of at least one axial loading button.
  • any means can be provided for heating the products transported on said furnace outer conveyor to z. B. to prevent or limit the cooling of these products and / or to achieve a real preheating or reheating of the products.
  • at least one lateral, provided outside the walking beam furnace conveyor according to the invention in a corresponding, preferably heat-insulated and expediently z. B. be arranged with the help of the exhaust gases of the walking beam furnace heated chamber.
  • B. Stick certain walking beam furnace With 2 the fixed beams and with 3 the walking beams of the walking beam conveyor arranged inside the furnace 1 are designated.
  • the direction of the gradual transverse axial advance of the billets in the furnace 1 by the walking beam conveyor 2, 3 is indicated by the arrow 4.
  • a transverse roller table 5 is provided in the interior of the furnace, the rollers of which are driven by assigned motors 105.
  • a similar, cross-directional roller table 6 is also provided inside the furnace at the outlet end of the furnace 1. With 106 the drive motors of the rollers of this run-out roller table 6 are designated.
  • the billets are axially pushed out of the furnace in the direction of arrow 8 through a lateral outlet opening 7.
  • the wall of the furnace chamber opposite the lateral furnace outlet opening 7 has a plurality of furnace inlet openings 11, 12, 13, 14 which are successive in the longitudinal direction and are dimensioned such that a single billet axially in at one time through each furnace inlet opening can be inserted into the furnace 1.
  • the lateral furnace inlet openings are arranged in succession in the longitudinal direction of the furnace, ie in the feed direction 4 of the billets inside the furnace.
  • the distance between the central axes of the successive, lateral furnace inlet openings 11, 12, 13 and 14 corresponds to one feed step or several feed steps of the billets in the interior of the furnace 1 by means of the walking beam conveyor 2, 3 inside the furnace.
  • the first lateral furnace inlet opening 11 is flush with the inlet roller table 5, while the subsequent lateral furnace inlet openings 12, 13, 14 are arranged in alignment with the positions assumed by the billets on the fixed beams 2 of the furnace 1 in the course of the feed.
  • an outer walking beam conveyor 9, 10 is provided, which extends parallel to the inner walking beam conveyor 2, 3 over part of the furnace length.
  • the feed direction 15 of the outer walking beam conveyor 9, 10 corresponds to the feeding direction 4 of the inner walking beam conveyor 2, 3.
  • the oven-external conveyor 9, 10 is assigned to a transverse loading roller table 16 with motor-driven rollers, which is arranged in alignment with the first oven inlet opening 11 and with the subsequent inlet roller table 5 lying inside the oven 1.
  • the furnace outer walking beam conveyor 9, 10 is arranged in a chamber 17, which can also be thermally insulated.
  • the outer walking beam conveyor 9, 10 and the inner walking beam conveyor 2, 3 have the same feed step and are synchronized with each other.
  • the billets to be heated are fed in the direction of the arrow 18 and are aligned with their longitudinal axis in the direction of the arrow, and run into the feed roller table 16 through a side loading opening 19 provided in the chamber 17.
  • the supplied billets are checked and classified based on their temperature. Because of their temperature, the billets are introduced into the oven through the lateral oven inlet opening 11, 12, 13, 14 which corresponds to a position on the heating curve corresponding to the temperature of each individual billet.
  • the colder billets are introduced directly from the loading roller table 16 through the first oven inlet opening onto the subsequent inlet roller table 5 into the oven and then removed from this inlet roller table 5 through the walking beams 3 of the inside walking beam conveyor 2, 3 and gradually across the entire length in the feed direction 4 of the furnace 1 transported. The coldest billets therefore remain in furnace 1 for the longest possible dwell time and consequently experience the greatest warming.
  • the warmer billets are stopped on the loading roller table 16, then removed from this roller table by the walking beams 10 of the outer walking beam conveyor 9, 10 and then gradually conveyed transversely axially in the feed direction 15 by this outside conveyor, which corresponds to the feeding direction 4 of the billets inside the furnace corresponds.
  • this outside conveyor For each billet redirected in this way and advanced by the outside of the walking beam conveyor 9, 10, an empty space remains on the inside of the walking beam conveyor 2, 3 in the succession of the billets which are advanced inside the furnace 1.
  • the positions that the billets on the fixed beam 2 of the furnace-internal walking beam conveyor 2, 3 can occupy are aligned with the positions that the billets on the fixed beam 9 of the furnace-outside walking beam conveyor 9, 10 can assume.
  • a billet picked up by the outer walking beam conveyor 9, 10 and the corresponding empty space on the inner walking beam conveyor 3 move synchronously and in alignment with one another in the feed directions 15 and 4.
  • This introduction of the billet into the furnace 1 from the furnace outer walking beam conveyor 9, 10, to the inner walking beam conveyor 2, 3 through one of the side furnace inlet openings 12, 13, 14 is carried out with the aid of at least one axial loading button 20 which enters the chamber 17 from which Oven 1 opposite side engages through openings 21 arranged in alignment with the furnace inlet openings 12, 13, 14.
  • the billets are preferably introduced into the furnace 1 through the side furnace inlet openings 12, 13, 14 at the moment when the inside of the walking beams 3 and the outside walking beams 10 are in their lowered position and the sticks on the respective fixed beams 2, 9 lie.
  • the inside and outside of the fixed beams 2 and 9 are suitably profiled and form transverse guides 22 which are aligned with one another for the billets in the region of each side furnace inlet opening 12, 13, 14.
  • each space on the outer walking beam conveyor 9, 10 occupied by a billet always corresponds to a free, idle space on the inside of the walking beam conveyor 2, 3, so that when the warmer billets are introduced late through one of the furnace inlet openings 12, 13, 14, which are downstream of the first furnace inlet opening 11 for the direct introduction of the billets into the furnace, no interference can occur. It is also evident that the billets exit through the furnace outlet opening 7 in the same order in which they are fed to the furnace in the direction of arrow 18 on the feed roller table 16, the furnace outlet temperatures of the billets being substantially the same and corresponding to the rolling temperature.
  • the classification of the billets on the basis of their temperature can also take place automatically and can, for. B. on the basis of a single temperature measurement on the feed path of the billets to the furnace with the aid of an automatic control device taking into account the cooling curve of the billets or on the basis of several, immediate and successive temperature measurements, e.g. B. in the aligned with the individual lateral oven inlet openings 12, 13, 14 stick positions.
  • the control means form part of a control arrangement which controls the drive of the motor-driven roller tables 5, 16, the closing and opening movements of the doors of the furnace inlet openings 11, 12, 13, 14, the actuation of the loading handles 20 and the movements of the furnace interior and the furnace exterior lifting beams 3, 10 controls.
  • the invention also makes it possible, using the same walking beam furnace, to heat not only iron and steel products with different furnace inlet temperatures but also or only products with different thicknesses or different cross sections and / or products of different quality to the same furnace outlet temperature.
  • the control and classification system is designed in such a way that it not only detects the temperature of the individual, supplied products, but also or only their thickness or their cross section and / or their quality in order to determine the lateral oven inlet opening 11 on the basis of this determination , 12, 13, 14 to determine through which each individual product must be introduced into the oven to achieve the desired oven outlet temperature.
  • the chamber 17 in which the furnace outer walking beam conveyor 10 is housed not only be heat-insulated but also heated, in particular with the exhaust gases of the walking beam furnace 1.
  • the chamber 17, which contains the outer walking beam conveyor 9, 10 can be regarded as a prechamber to the walking beam furnace 1 . are, this pre-chamber 17 and the furnace 1 have different heating curves which intersect in the area of the merging of the products in question, ie in the transfer point of the products from the pre-chamber 17 into the furnace 1.
  • a plurality of axial loading levers in particular one axial loading lever each in the region of each furnace inlet opening 12, 13, 14, or a single one mounted on a carriage, alternately coaxial with the individual furnace inlet openings 12, 13 , 14 adjustable axial charge button 20 may be provided.
  • the invention can be applied not only to the introduction of the iron and steel products to be heated into the walking beam furnace, but also to the execution of the heated products from the walking beam furnace.
  • the invention can be used both in the introduction of the products to be heated into the oven and in the execution of the heated products from the oven.
  • the invention can be used in conjunction with any walking beam furnace, regardless of its structural design, the drive means of the walking beam and the heating and regulating means of the furnace.
  • the invention is suitable for use in connection with already existing walking beam furnaces for the purpose of converting them into furnaces according to the invention, since the necessary changes to the furnace are irrelevant and only require the presence of a sufficiently large free space to the side of the furnace.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
  • Meat, Egg Or Seafood Products (AREA)

Abstract

In the walking beam furnaces, in order to heat metallurgical materials such as billets, bars and the like, having different temperatures of introduction into the furnace and/or different cross sections, so as to discharge materials at uniform temperatures from the furance, said materials are selected according to their temperature and/or cross section, and are introduced into the furnace through a plurality of side inlet doors while said materials are conveyed along the furnace by means of an external side conveyor, and/or they are discharged from the furnace through a plurality of side outlet doors and are then advanced outside along the furnace by means of an external side conveyor. The external side conveyor can be formed by a walking beam conveyor, timed with the internal walking beam conveyor as to the length and rate of steps, and/or timed in relation therewith so that at each occupied position on the external walking beam conveyor always corresponds an unoccupied position on the internal walking beam conveyor, and vice versa. The external conveyor can be enclosed in a chamber which, if desired, is insulated and is associated with heating means such as the exhaust gases discharged from the furnace.

Description

Die Erfindung betrifft ein Verfahren zum Erwärmen von Eisenhüttenerzeugnissen unterschiedlicher Art und/oder Ausgangstemperatur in Hubbalkenöfen, sowie ein Hubbalkenofen zur Durchführung des Verfahrens. Unter dem Sammelbegriff « Eisenhüttenerzeugnisse » werden dabei Knüppel, Brammen, Blöcke u. dgl. verstanden.The invention relates to a method for heating iron and steel products of different types and / or starting temperature in walking beam furnaces, and a walking beam furnace for carrying out the method. Under the collective term "iron and steel products" billets, slabs, blocks and. Like understood.

Die Verbesserung der Qualität der im Stranggiessverfahren erhaltenen Erzeugnisse gestattet es, in vielen Fällen von einer Kontrolle dieser Erzeugnisse abzusehen. Diese Kontrolle erfordert die Abkühlung der Erzeugnisse auf Temperaturen, die sich der Raumtemperatur nähern. Diese Vereinfachung bietet auch die vom Standpunkt der Energieersparnis sehr günstige Möglichkeit, die Wärm- und Ausgleichsöfen mit noch warmen, unmittelbar von der Stranggiessanlage zugeführten Erzeugnissen zu beschicken. Die Beschickungsmöglichkeit der Öfen mit diesen Erzeugnissen wird jedoch dadurch verhindert, dass die bekannten Hubbalkenöfen zur Aufnahme von Erzeugnissen mit im wesentlichen gleichen Ofeneinlauftemperaturen ausgelegt sind. Die Erzeugnisse, die in die bekannten Öfen mit einer von der Durchschnittstemperatur bedeutend abweichenden Temperatur einlaufen, verlassen deshalb den Ofen mit einer Temperatur, die niedriger als die für den Walzvorgang erforderliche Temperatur ist, oder werden unzulässig stark erwärmt und beginnen zu schmelzen. Um diesen Nachteil nach Möglichkeit zu beheben, muss bisher der Betrieb des im Anschluss an den Hubbalkenwärmofen vorgesehenen Walzwerks derart dem Betrieb des Stranggiesswerks angepasst werden, dass die warmen Erzeugnisse den Ofen ohne Aufenthalte wechselnder Dauer und infolgedessen ohne unterschiedlich starke Abkühlung erreichen.The improvement in the quality of the products obtained by the continuous casting process makes it possible in many cases to refrain from checking these products. This control requires the products to cool to temperatures close to room temperature. This simplification also offers the option, which is very favorable from the point of view of energy saving, of charging the heating and equalizing furnaces with products which are still warm and are fed directly from the continuous casting installation. The possibility of loading the furnaces with these products is prevented, however, by the fact that the known walking beam furnaces are designed to accommodate products with essentially the same furnace inlet temperatures. The products which enter the known furnaces at a temperature which differs significantly from the average temperature therefore leave the furnace at a temperature which is lower than the temperature required for the rolling process, or are heated to an unacceptably high degree and begin to melt. In order to remedy this disadvantage as far as possible, the operation of the rolling mill provided in connection with the walking beam heating furnace had to be adapted to the operation of the continuous casting plant in such a way that the hot products reach the furnace without stays of varying duration and consequently without cooling to different degrees.

Das Einhalten dieser Bedingung bereitet jedoch praktische Schwierigkeiten, insbesondere in den Anlagen, die eine einzige Stranggiesskokille und eine einzige Walzlinie aufweisen. Wegen dieser Schwierigkeiten wird zum Erreichen einer gleichmässigen Temperatur der erwärmten Eisenhüttenerzeugnisse manchmal sogar vorgezogen, alle von der Stranggiessanlage gelieferten Erzeugnisse zunächst vollständig abzukühlen und dadurch auf die Vorteile einer Ofenbeschickung mit den noch warmen Erzeugnissen zu verzichten.However, complying with this condition presents practical difficulties, particularly in the plants which have a single continuous casting mold and a single rolling line. Because of these difficulties, in order to achieve a uniform temperature of the heated iron and steel products, it is sometimes even preferred to completely cool down all of the products supplied by the continuous casting installation and thereby to forego the advantages of charging the furnace with the products which are still hot.

Die vorliegende Erfindung hat die Aufgabe, die oben angeführten Nachteile zu beseitigen und ein Verfahren zum Erwärmen. von Eisenhüttenerzeugnissen in Hubbalkenöfen zu entwickeln, das es ermöglicht, den Ofen mit aufeinanderfolgenden Erzeugnissen unterschiedlicher Erwärmungscharakteristik zu beschicken und trotzdem am Auslauf des Ofens auf eine im wesentlichen gleichförmige, für den Walzvorgang geeignete Temperatur erwärmte Erzeugnisse zu erhalten. Unter dem Sammelbegriff « Erwärmungscharakteristik ist dabei die aus der Temperatur und/oder dem Querschnitt, insbesondere der Stärke, und/oder der Qualität zusammengesetzte Kennzeichnung der Eisenhüttenerzeugnisse zu verstehen.The object of the present invention is to eliminate the disadvantages mentioned above and to provide a method for heating. of iron and steel products in walking beam furnaces, which makes it possible to load the furnace with successive products with different heating characteristics and still obtain heated products at the outlet of the furnace to a substantially uniform temperature suitable for the rolling process. The collective term “heating characteristic” is understood to mean the identification of the iron and steel products, which is composed of the temperature and / or the cross section, in particular the thickness, and / or the quality.

Diese Aufgabe wird erfindungsgemäss mit den in den Patentansprüchen 1 und 2 gekennzeichneten Verfahren gelöst. Zur Durchführung des erfindungsgemässen Verfahrens sieht die Erfindung einen Hubbalkenofen vor, der im wesentlichen dadurch gekennzeichnet ist, dass er mehrere, in der Ofenlängsrichtung aufeinanderfolgende, seitliche Ofeneinlauföffnungen und/ oder mehrere, in der Ofenlängsrichtung aufeinanderfolgende, seitliche Ofenauslauföffnungen auweist, und auf mindestens einer Seite des Ofens neben dem Ofen im Bereich der Ofeneinlauföffnungen und/oder der Ofenauslauföffnungen ein ofenäusserer, sich in der Ofenlängsrichtung erstreckender Förderer für die Erzeugnisse vorgesehen ist, der mit dem ofeninneren Hubbalkenförderer synchronisiert bzw. auf diesen abgestimmt ist und die Erzeugnisse in der selben Richtung und mit der selben Geschwindingkeit des ofeninneren Hubbalkenförderers vorschiebt, wobei Einschubmittel zum Einführen der Erzeugnisse in den Ofen durch eine beliebige der seitlichen Ofeneinlauföffnungen und zum Überführen der Erzeugnisse vom ofenäusseren Förderer auf den ofeninneren Hubbalkenförderer und/oder Ausstossmittel zum Ausschieben der Erzeugnisse aus dem Ofen durch eine beliebige der seitlichen Ofenauslauföffnungen und zum Überführen der Erzeugnisse vom ofeninneren Hubbalkenförderer auf den ofenäusseren Förderer, sowie Kontroll- und Steuermittel zur Einordnung der zugeführten, zu erwärmenden Erzeugnisse und/oder der im Ofen erwärmten Erzeugnisse auf Grund ihrer Erwärmungscharakteristik vorgesehen sind.According to the invention, this object is achieved with the methods characterized in patent claims 1 and 2. To carry out the method according to the invention, the invention provides a walking beam furnace, which is essentially characterized in that it has a plurality of lateral furnace inlet openings which follow one another in the longitudinal direction of the furnace and / or a plurality of lateral furnace outlet openings which follow one another in the longitudinal direction of the furnace, and on at least one side of the furnace In addition to the oven in the area of the oven inlet openings and / or the oven outlet openings, an oven-external conveyor, which extends in the longitudinal direction of the oven, is provided for the products, which is synchronized with or matched to the oven-internal walking beam conveyor and the products in the same direction and with the feeds the same speed of the furnace-internal walking beam conveyor, with insertion means for introducing the products into the furnace through any of the lateral furnace inlet openings and for transferring the products from the furnace-outside conveyor onto the furnace-inside walking beam Conveyors and / or ejection means for pushing the products out of the oven through any of the lateral oven outlet openings and for transferring the products from the inside of the walking beam conveyor to the outside conveyor, as well as control and control means for classifying the products to be heated and / or in the oven heated products are provided due to their warming characteristics.

Konstruktionsmässig kann der Hubbalkenofen mit erfindungsgemäss zugeordnetem, ofenäusserem, gleichlaufendem Förderer in verschiedener Weise ausgebildet werden. So z. B. kann der ofenäussere, einer Vielzahl von aufeinanderfolgenden, seitlichen Ofenöffnungen zugeordnete Förderer nur auf der Ofeneinlaufseite oder nur auf der Ofenauslaufseite oder sowohl auf der Ofeneinlaufseite als auch auf der Ofenauslaufseite vorgesehen sein. Die aufeinanderfolgenden .seitlichen Ofeneinlauf- oder Ofenauslauföffnungen können derart ausgebildet sein, dass sie nur je ein Erzeugnis auf einmal durchlassen, oder können eine solche Breite aufweisen, dass jede von ihnen den Einlauf in den Ofen und/oder den Auslauf aus dem Ofen von je einem Erzeugnis in mehreren, verschiedenen, in der Ofenlängsrichtung versetzten Stellen ermöglicht. Im Grenzfall kann sogar eine einzige, seitliche Ofeneinlauföffnung und/oder eine einzige seitliche Ofenauslauföffnung vorgesehen sein, die sich über die ganze Länge des zugeordneten ofenäusseren Förderers erstreckt.In terms of construction, the walking beam furnace can be designed in various ways with an external, synchronous conveyor assigned according to the invention. So z. B. the oven outer, a plurality of successive, lateral oven openings assigned conveyor can only be provided on the oven inlet side or only on the oven outlet side or both on the oven inlet side and on the oven outlet side. The successive . Lateral oven inlet or outlet openings can be designed in such a way that they only allow one product to pass through at a time, or can be of such a width that each of them allows the entry into the oven and / or the outlet from the oven of one product in several , various positions offset in the longitudinal direction of the furnace. In the limit case, even a single, lateral furnace inlet opening and / or a single lateral furnace outlet opening can be provided, which extends over the entire length of the assigned furnace outer conveyor.

Sowohl der ofenäussere Förderer als auch die zugeordneten Einschub- bzw. Ausstossmittel können in verschiedener Weise ausgebildet sein. In einer bevorzugten Ausführungsform besteht der ofenäussere Förderer aus einem Schrittförderer, insbesondere aus einem Hubbalkenförderer, der ähnlich wie der ofeninnere Hubbalkenförderer ausgebildet ist. Die Einschubmittel zum Einführen der Erzeugnisse vom seitlichen ofenäusseren Förderer in den Ofen und/oder die Ausstossmittel zum Ausschieben der Erzeugnisse aus dem Ofen auf den seitlichen ofenäusseren Förderer können aus mindestens einem axialen Ladedrücker bestehen.Both the furnace external conveyor and the assigned insertion or ejection means can be designed in different ways. In a preferred embodiment, the furnace outer conveyor consists of a step conveyor, in particular of a walking beam conveyor, which is designed similarly to the inside walking beam conveyor. The insertion means for introducing the products from the lateral oven-outer conveyor into the oven and / or the ejection means for pushing the products out of the oven onto the lateral oven-outer conveyor can consist of at least one axial loading button.

Im Bereich des ofenäusseren, seitlichen, auf der Ofeneinlaufseite und/oder auf der Ofenauslaufseite vorgesehenen Förderers können beliebige Mittel zur Erwärmung der auf dem genannten ofenäusseren Förderer transportierten Erzeugnisse vorgesehen sein, um z. B. die Abkühlung dieser Erzeugnisse zu verhindern oder einzuschränken und/oder eine regelrechte Vor- bzw. Nacherwärmung der Erzeugnisse zu erzielen. Zu diesem Zweck kann mindestens ein seitlicher, ausserhalb des Hubbalkenofens vorgesehener Förderer erfindungsgemäss in einer entsprechenden, vorzugsweise wärmeisolierten und zweckmässig z. B. mit Hilfe der Abgase des Hubbalkenofens beheizten Kammerangeordnet sein.In the area of the outer, lateral, on the furnace inlet side and / or on the furnace outlet side conveyor any means can be provided for heating the products transported on said furnace outer conveyor to z. B. to prevent or limit the cooling of these products and / or to achieve a real preheating or reheating of the products. For this purpose, at least one lateral, provided outside the walking beam furnace conveyor according to the invention in a corresponding, preferably heat-insulated and expediently z. B. be arranged with the help of the exhaust gases of the walking beam furnace heated chamber.

Diese und andere Kennzeichen der Erfindung und die dadurch erzielten Vorteile ergeben sich mit näheren Einzelheiten aus nachstehender Beschreibung eines erfindungsgemässen Hubbalkenofens, der beispielsweise in Draufsicht und teilweise im Schnitt in der einzigen Figur der Zeichnung dargestellt ist.These and other characteristics of the invention and the advantages achieved thereby result in more detail from the following description of a walking beam furnace according to the invention, which is shown for example in plan view and partly in section in the single figure of the drawing.

In der Zeichnung ist 1 die Kammer eines zur Erwärmung von Eisenhüttenerzeugnissen z. B. Knüppeln bestimmten Hubbalkenofens. Mit 2 sind die Festbalken und mit 3 die Hubbalken des im Inneren des Ofens 1 angeordneten Hubbalkenförderers bezeichnet.In the drawing 1 is the chamber of a for heating iron and steel products z. B. Stick certain walking beam furnace. With 2 the fixed beams and with 3 the walking beams of the walking beam conveyor arranged inside the furnace 1 are designated.

Die Richtung des schrittweisen queraxialen Vorschubs der Knüppel im Ofen 1 durch den Hubbalkenförderer 2, 3 ist mit dem Pfeil 4 angegeben. Am Einlaufende des Ofens 1 ist im Ofeninneren ein quergerichteter Rollgang 5 vorgesehen, dessen Rollen von zugeordneten Motoren 105 angetrieben werden. Ein ähnlicher, quergerichteter Rollgang 6 ist im Ofeninneren auch am Auslaufende des Ofens 1 vorgesehen. Mit 106 sind die Antriebsmotoren der Rollen dieses Auslaufrollgangs 6 bezeichnet. Das axiale Ausschieben der Knüppel aus dem Ofen erfolgt in der Pfeilrichtung 8 durch eine seitliche Auslauföffnung 7.The direction of the gradual transverse axial advance of the billets in the furnace 1 by the walking beam conveyor 2, 3 is indicated by the arrow 4. At the inlet end of the furnace 1, a transverse roller table 5 is provided in the interior of the furnace, the rollers of which are driven by assigned motors 105. A similar, cross-directional roller table 6 is also provided inside the furnace at the outlet end of the furnace 1. With 106 the drive motors of the rollers of this run-out roller table 6 are designated. The billets are axially pushed out of the furnace in the direction of arrow 8 through a lateral outlet opening 7.

Am Einlaufende des Ofens 1 weist die der seitlichen Ofenauslauföffnung 7 gegenüberlienende Wand der Ofenkammer mehrere, in der (-.enlängsrichtung aufeinanderfolgende Ofeneinlauföffnungen 11, 12, 13, 14 auf, die derart bemessen sind, dass durch jede Ofeneinlauföffnung ein einziger Knüppel auf einmal axial in den Ofen 1 eingeführt werden kann. Die seitlichen Ofeneinlauföffnungen sind aufeinanderfolgend in der. Längsrichtung des Ofens, d. h. in der Vorschubrichtung 4 der Knüppel im Ofeninneren angeordnet.At the inlet end of the furnace 1, the wall of the furnace chamber opposite the lateral furnace outlet opening 7 has a plurality of furnace inlet openings 11, 12, 13, 14 which are successive in the longitudinal direction and are dimensioned such that a single billet axially in at one time through each furnace inlet opening can be inserted into the furnace 1. The lateral furnace inlet openings are arranged in succession in the longitudinal direction of the furnace, ie in the feed direction 4 of the billets inside the furnace.

Der Abstand zwischen den Mittelachsen der aufeinanderfolgenden, seitlichen Ofeneinlauföffnungen 11, 12, 13 und 14 entspricht einem Vorschubschritt oder mehreren Vorschubschritten der Knüppel im Inneren des Ofens 1 durch den ofeninneren Hubbalkenförderer 2, 3. Die erste seitliche Ofeneinlauföffnung 11 liegt fluchtend mit dem Einlaufrollgang 5, während die nachfolgenden seitlichen Ofeneinlauföffnungen 12, 13, 14 fluchtend zu den von den Knüppeln auf den Festbalken 2 des Ofens 1 im Laufe des Vorschubs eingenommenen Stellungen angeordnet sind.The distance between the central axes of the successive, lateral furnace inlet openings 11, 12, 13 and 14 corresponds to one feed step or several feed steps of the billets in the interior of the furnace 1 by means of the walking beam conveyor 2, 3 inside the furnace. The first lateral furnace inlet opening 11 is flush with the inlet roller table 5, while the subsequent lateral furnace inlet openings 12, 13, 14 are arranged in alignment with the positions assumed by the billets on the fixed beams 2 of the furnace 1 in the course of the feed.

Im Bereich der seitlichen Ofeneinlauföffnungen 11, 12, 13, 14 ist neben dem Ofen 1 ein ofenäusserer Hubbalkenförderer 9, 10 vorgesehen, der sich über einen Teil der Ofenlänge parallel zum ofeninneren Hubbalkenförderer 2, 3 erstreckt. Die Vorschubrichtung 15 des ofenäusseren Hubbalkenförderers 9, 10 entspricht der Vorschubrichtung 4 des ofeninneren Hubbalkenförderers 2, 3.In the area of the lateral furnace inlet openings 11, 12, 13, 14, in addition to the furnace 1, an outer walking beam conveyor 9, 10 is provided, which extends parallel to the inner walking beam conveyor 2, 3 over part of the furnace length. The feed direction 15 of the outer walking beam conveyor 9, 10 corresponds to the feeding direction 4 of the inner walking beam conveyor 2, 3.

Mit 9 sind die Festbalken des ofenäusseren Hubbalkenförderers 9, 10 bezeichnet. Der ofenäussere Förderer 9, 10 ist einem quergerichteten Beschickungsrollgang 16 mit motorangetriebenen Rollen zugeordnet, der fluchtend zu der ersten Ofeneinlauföffnung 11 und zum anschliessenden, im Inneren des Ofens 1 liegenden Einlaufrollgang 5 angeordnet ist. Der ofenäussere Hubbalkenförderer 9, 10 ist in einer Kammer 17 angeordnet, die auch wärmeisoliert sein kann. Der ofenäussere Hubbalkenförderer 9, 10 und der ofeninnere Hubbalkenförderer 2, 3 weisen den selben Vorschubschritt auf und sind untereinander synchronisiert.With 9 the fixed beams of the outer walking beam conveyor 9, 10 are designated. The oven-external conveyor 9, 10 is assigned to a transverse loading roller table 16 with motor-driven rollers, which is arranged in alignment with the first oven inlet opening 11 and with the subsequent inlet roller table 5 lying inside the oven 1. The furnace outer walking beam conveyor 9, 10 is arranged in a chamber 17, which can also be thermally insulated. The outer walking beam conveyor 9, 10 and the inner walking beam conveyor 2, 3 have the same feed step and are synchronized with each other.

Die zu erwärmenden, insbesondere unmittelbar von einer Stranggiessanlage gelieferten Knüppel werden in der Pfeilrichtung 18 zugeführt und sind mit ihrer Längsachse in dieser Pfeilrichtung ausgerichtet, wobei sie durch eine seitliche, in der Kammer 17 vorgesehene Beschickungsöffnung 19 auf den Beschickungsrollgang 16 einlaufen.The billets to be heated, in particular delivered directly from a continuous caster, are fed in the direction of the arrow 18 and are aligned with their longitudinal axis in the direction of the arrow, and run into the feed roller table 16 through a side loading opening 19 provided in the chamber 17.

Bei gleicher Qualität und gleicher Stärke bzw. gleichem Querschnitt werden die zugeführten Knüppel auf Grund ihrer Temperatur geprüft und eingeordnet. Auf Grund ihrer Temperatur werden die Knüppel durch diejenige seitliche Ofeneinlauföffnung 11,12,13,14 in den Ofen eingeführt, die einer der Temperatur jedes einzelnen Knüppels korrespondierenden Stellung auf der Erwärmungskurve entspricht. Insbesondere werden die kälteren Knüppel unmittelbar vom Beschickungsrollgang 16 durch die erste Ofeneinlauföffnung auf den anschliessenden Einlaufrollgang 5 in den Ofen eingeführt und dann von diesem Einlaufrollgang 5 durch die Hubbalken 3 des ofeninneren Hubbalkenförderers 2, 3 abgenommen und schrittweise queraxial in der Vorschubrichtung 4 über die ganze Länge des Ofens 1 befördert. Die kältesten Knüppel bleiben also für die längsmögliche Verweilzeit im Ofen 1 und erfahren infolgedessen die stärkste Erwärmung.With the same quality and the same strength or the same cross-section, the supplied billets are checked and classified based on their temperature. Because of their temperature, the billets are introduced into the oven through the lateral oven inlet opening 11, 12, 13, 14 which corresponds to a position on the heating curve corresponding to the temperature of each individual billet. In particular, the colder billets are introduced directly from the loading roller table 16 through the first oven inlet opening onto the subsequent inlet roller table 5 into the oven and then removed from this inlet roller table 5 through the walking beams 3 of the inside walking beam conveyor 2, 3 and gradually across the entire length in the feed direction 4 of the furnace 1 transported. The coldest billets therefore remain in furnace 1 for the longest possible dwell time and consequently experience the greatest warming.

Die wärmeren Knüppel werden dagegen auf dem Beschickungsrollgang 16 angehalten, dann von diesem Rollgang durch die Hubbalken 10 des ofenäusseren Hubbalkenförderers 9, 10 abgenommen und anschliessend von diesem ofenäusseren Förderer schrittweise queraxial in der Vorschubrichtung 15 befördert, die der Vorschubrichtung 4 der Knüppel im Inneren des Ofens entspricht. Für jeden derart umgeleiteten und vom ofenäusseren Hubbalkenförderer 9, 10 vorgeschobenen Knüppel verbleibt auf dem ofeninneren Hubbalkenförderer 2, 3 ein leerer Platz in der Aufeinanderfolge der Knüppel, die im Inneren des Ofens 1 vorgeschoben werden. Die Lagen, die die Knüppel auf den Festbalken 2 des ofeninneren Hubbalkenförderers 2, 3 einnehmen können, liegen fluchtend zu den Lagen, die die Knüppel auf den Festbalken 9 des ofenäusseren Hubbalkenförderers 9, 10 einnehmen können. Ein vom ofenäusseren Hubbalkenförderer 9, 10 aufgenommener Knüppel und der entsprechende, freigelassene Leerplatz auf dem ofeninneren Hubbalkenförderer 3 bewegen sich infolgedessen synchron und zueinander fluchtend in den Vorschubrichtungen 15 und 4.The warmer billets, on the other hand, are stopped on the loading roller table 16, then removed from this roller table by the walking beams 10 of the outer walking beam conveyor 9, 10 and then gradually conveyed transversely axially in the feed direction 15 by this outside conveyor, which corresponds to the feeding direction 4 of the billets inside the furnace corresponds. For each billet redirected in this way and advanced by the outside of the walking beam conveyor 9, 10, an empty space remains on the inside of the walking beam conveyor 2, 3 in the succession of the billets which are advanced inside the furnace 1. The positions that the billets on the fixed beam 2 of the furnace-internal walking beam conveyor 2, 3 can occupy are aligned with the positions that the billets on the fixed beam 9 of the furnace-outside walking beam conveyor 9, 10 can assume. As a result, a billet picked up by the outer walking beam conveyor 9, 10 and the corresponding empty space on the inner walking beam conveyor 3 move synchronously and in alignment with one another in the feed directions 15 and 4.

Wenn ein anfänglich wärmerer und deshalb auf dem ofenäusseren Hubbalkenförderer 9, 10 queraxial vorgeschobener Knüppel eine Stelle in der Längsrichtung des Ofens erreicht, ab welcher die Erwärmung dieses Knüppels im Inneren der restlichen Teillänge des Ofens eine Ofenauslauftemperatur des Knüppels bewirken würde, die im wesentlichen der Ofenauslauftemperatur des kältesten, unmittelbar durch die erste seitliche Ofeneinlauföffnung 11 in den Ofen eingeführten Knüppels entspricht, wird auch der genannte wärmere Knüppel durch eine der weiteren, seitlichen Ofeneinlauföffnungen 12, 13, 14 axial in den Ofen 1 eingeführt. Diese Einführung des Knüppels in den Ofen 1 vom ofenäusseren Hubbalkenförderer 9, 10, auf den inneren Hubbalkenförderer 2, 3 durch eine der seitlichen Ofeneinlauföffnungen 12, 13, 14 erfolgt mit Hilfe von mindestens einem axialen Ladedrücker 20, der in die Kammer 17 von der dem Ofen 1 entgegengesetzten Seite her durch fluchtend mit den Ofeneinlauföffnungen 12, 13, 14 angeordneten Öffnungen 21 eingreift. Die Einführung der Knüppel in den Ofen 1 durch die seitlichen Ofeneinlauföffnungen 12, 13, 14 erfolgt vorzugsweise in dem Augenblick, in dem sich die ofeninneren Hubbalken 3 und die ofenäusseren Hubbalken 10 in ihrer abgesenkten Stellung befinden und die Knüppel auf den betreffenden Festbalken 2, 9 liegen. In diesem Fall sind die ofeninneren und die ofenäusseren Festbalken 2 und 9 zweckmässig profiliert und bilden quergerichtete, zueinander fluchtende Führungen 22 für die Knüppel im Bereich jeder- seitlichen Ofeneinlauföffnung 12, 13, 14.When an initially warmer stick, which is therefore advanced axially on the outside of the walking beam conveyor 9, 10, reaches a point in the longitudinal direction of the furnace from which the heating of this stick inside the remaining part of the length of the furnace would result in a furnace outlet temperature of the stick, which is essentially the furnace outlet temperature corresponds to the coldest billet inserted directly into the furnace through the first lateral furnace inlet opening 11, the said warmer billet is also introduced axially into the furnace 1 through one of the further lateral furnace inlet openings 12, 13, 14. This introduction of the billet into the furnace 1 from the furnace outer walking beam conveyor 9, 10, to the inner walking beam conveyor 2, 3 through one of the side furnace inlet openings 12, 13, 14 is carried out with the aid of at least one axial loading button 20 which enters the chamber 17 from which Oven 1 opposite side engages through openings 21 arranged in alignment with the furnace inlet openings 12, 13, 14. The billets are preferably introduced into the furnace 1 through the side furnace inlet openings 12, 13, 14 at the moment when the inside of the walking beams 3 and the outside walking beams 10 are in their lowered position and the sticks on the respective fixed beams 2, 9 lie. In this case, the inside and outside of the fixed beams 2 and 9 are suitably profiled and form transverse guides 22 which are aligned with one another for the billets in the region of each side furnace inlet opening 12, 13, 14.

Es ist offensichtlich, dass jedem auf dem ofenäusseren Hubbalkenförderer 9, 10 von einem Knüppel besetzten Platz stets ein freier, mitlaufender Leerplatz auf dem ofeninneren Hubbalkenförderer 2, 3 entspricht, so dass bei der verspäteten Einführung der wärmeren Knüppel durch eine der Ofeneinlauföffnungen 12, 13, 14, die der ersten Ofeneinlauföffnung 11 für die direkte Einführung der Knüppel in den Ofen nachgeschaltet sind, keine Interferenzen entstehen können. Es ist ausserdem offensichtlich, dass die Knüppel durch die Ofenauslauföffnung 7 in der selben Reihenfolge austreten, in der sie dem Ofen in der Pfeilrichtung 18 auf dem Beschickungsrollgang 16 zugeführt werden, wobei die Ofenauslauftemperaturen der Knüppel im wesentlichen gleich gross sind und der Walztemperatur entsprechen.It is evident that each space on the outer walking beam conveyor 9, 10 occupied by a billet always corresponds to a free, idle space on the inside of the walking beam conveyor 2, 3, so that when the warmer billets are introduced late through one of the furnace inlet openings 12, 13, 14, which are downstream of the first furnace inlet opening 11 for the direct introduction of the billets into the furnace, no interference can occur. It is also evident that the billets exit through the furnace outlet opening 7 in the same order in which they are fed to the furnace in the direction of arrow 18 on the feed roller table 16, the furnace outlet temperatures of the billets being substantially the same and corresponding to the rolling temperature.

Die Einordnung der Knüppel auf Grund ihrer Temperatur kann auch automatisch erfolgen und kann z. B. auf Grund einer einzigen Temperaturmessung auf dem Zuführungsweg der Knüppel zum Ofen mit Hilfe einer automatischen, die Abkühlungskurve der Knüppel berücksichtigenden Kontrollvorrichtung oder auf Grund von mehreren, unmittelbaren und aufeinanderfolgenden Temperaturmessungen z. B. in den mit den einzelnen seitlichen Ofeneinlauföffnungen 12, 13, 14 fluchtenden Knüppelstellungen vorgenommen werden.The classification of the billets on the basis of their temperature can also take place automatically and can, for. B. on the basis of a single temperature measurement on the feed path of the billets to the furnace with the aid of an automatic control device taking into account the cooling curve of the billets or on the basis of several, immediate and successive temperature measurements, e.g. B. in the aligned with the individual lateral oven inlet openings 12, 13, 14 stick positions.

Die Kontrollmittel bilden Bestandteil einer Steueranordnung, die den Antrieb der motorangetriebenen Rollgänge 5,16 die Schliess- und Öffnungsbewegungen der Türen der Ofeneinlauföffnungen 11, 12, 13, 14, die Betätigung der Ladedrücker 20 und die Bewegungen der öfeninneren und der ofenäusseren Hubbalken 3, 10 steuert.The control means form part of a control arrangement which controls the drive of the motor-driven roller tables 5, 16, the closing and opening movements of the doors of the furnace inlet openings 11, 12, 13, 14, the actuation of the loading handles 20 and the movements of the furnace interior and the furnace exterior lifting beams 3, 10 controls.

Die Erfindung ermöglicht es ausserdem, mit Hilfe des selben Hubbalkenofens nicht nur Eisenhüttenerzeugnisse mit unterschiedlichen Ofeneinlauftemperaturen sondern auch bzw. nur Erzeugnisse mit unterschiedliche Stärken oder unterschiedlichen Querschnitten und/oder Erzeugnisse unterschiedlicher Qualität bis zur selben Ofenauslauftemperatur zu erwärmen. In diesem Fall ist das Kontroll- und Einordnungssystem derart ausgebildet, dass es nicht nur die Temperatur der einzelnen, zugeführten Erzeugnisse, sondern auch bzw. nur deren Stärke oder deren Querschnitt und/oder deren Qualität feststellt, um auf Grund dieser Feststellung die seitliche Ofeneinlauföffnung 11, 12, 13, 14 zu bestimmen, durch welche jedes einzelne Erzeugnis zur Erzielung der gewünschten Ofenauslauftemperatur in den Ofen eingeführt werden muss.The invention also makes it possible, using the same walking beam furnace, to heat not only iron and steel products with different furnace inlet temperatures but also or only products with different thicknesses or different cross sections and / or products of different quality to the same furnace outlet temperature. In this case, the control and classification system is designed in such a way that it not only detects the temperature of the individual, supplied products, but also or only their thickness or their cross section and / or their quality in order to determine the lateral oven inlet opening 11 on the basis of this determination , 12, 13, 14 to determine through which each individual product must be introduced into the oven to achieve the desired oven outlet temperature.

Zur Beschränkung der Abkühlung der Knüppel od. dgl., die mit Hilfe des ofenäusseren Hubbalkenförderers 9, 10 vorgeschoben werden, bevor sie durch eine der aufeinanderfolgenden, seitlichen Ofeneinlauföffnungen 12, 13, 14 in den Ofen eingeschoben werden, kann die Kammer 17, in der der ofenäussere Hubbalkenförderer 10 untergebracht ist, nicht nur wärmeisoliert sein, sondern auch beheizt werden, insbesondere mit Hilfe der Abgase des Hubbalkenofens 1. In diesem Fall kann die Kammer 17, die den äusseren Hubbalkenförderer 9, 10 enthält, als eine Vorkammer zum Hubbalkenofen 1 angesehen. werden, wobei diese Vorkammer 17 und der Ofen 1 unterschiedliche Erwärmungskurven aufweisen, die sich im Bereich der Zusammenführung der betreffenden Erzeugnisse, d. h. in der Überführungsstelle der Erzeugnisse aus der Vorkammer 17 in den Ofen 1 schneiden.To limit the cooling of the billets or the like, which are advanced with the help of the furnace outer walking beam conveyor 9, 10 before they are inserted into the furnace through one of the successive, lateral furnace inlet openings 12, 13, 14, the chamber 17 in which the furnace outer walking beam conveyor 10 is housed, not only be heat-insulated but also heated, in particular with the exhaust gases of the walking beam furnace 1. In this case, the chamber 17, which contains the outer walking beam conveyor 9, 10, can be regarded as a prechamber to the walking beam furnace 1 . are, this pre-chamber 17 and the furnace 1 have different heating curves which intersect in the area of the merging of the products in question, ie in the transfer point of the products from the pre-chamber 17 into the furnace 1.

Zum Einschieben der Knüppel durch die seitlichen Ofeneinlauföffnungen 12, 13, 14 können mehrere axiale Ladedrücker, insbesondere je ein Axialladedrücker im Bereich jeder Ofeneinlauföffnung 12, 13, 14, oder ein einziger, auf einem Wagen gelagerter, abwechselnd koaxial zu den einzelnen Ofeneinlauföffnungen 12, 13, 14 einstellbarer Axialladedrücker 20 vorgesehen sein.To insert the billets through the side furnace inlet openings 12, 13, 14, a plurality of axial loading levers, in particular one axial loading lever each in the region of each furnace inlet opening 12, 13, 14, or a single one mounted on a carriage, alternately coaxial with the individual furnace inlet openings 12, 13 , 14 adjustable axial charge button 20 may be provided.

Die Erfindung kann nicht nur bei der Einführung der zu erwärmenden Eisenhüttenerzeugnisse in den Hubbalkenofen, sondern auch bei der Ausführung der erwärmten Erzeugnisse aus dem Hubbalkenofen angewendet werden. Dies bedeutet, dass statt der queraxialen Beförderung der anfänglich wärmeren Knüppel ausserhalb des Ofens in dessen Längsrichtung und der axialen Einführung dieser Knüppel in den Ofen mit einer mehr oder minder grossen Verspätung in verschiedenen Stellen längs des Ofens, je nach der Temperatur und/oder dem Querschnitt und/oder detr Qualität der Knüppel, so dass diese in der selben Stelle mit im wesentlichen gleich grossen Temperaturen aus dem Ofen ausgeführt werden,' die genannten Knüppel in üblicher Weise in der selben Stelle in den Ofen eingeführt und mit mehr oder minder grosser Voreilung in unterschiedlichen Stellen längs des Ofens aus diesem ausgeführt werden können, sobald sie die selbe angestrebte Ofenauslauftemperatur erreichen, wonach anschliessend die ausgeführten Knüppel ausserhalb des Ofens in dessen Längsrichtung bis zur Zusammenführung mit den im Inneren des Ofens vorgeschobenen Knüppeln weiter queraxial transportiert werden.The invention can be applied not only to the introduction of the iron and steel products to be heated into the walking beam furnace, but also to the execution of the heated products from the walking beam furnace. This means that instead of the transverse axial transport of the initially warmer billets outside the furnace in its longitudinal direction and the axial introduction of these billets into the furnace with a more or less great delay in different places along the furnace, depending on the temperature and / or the cross section and / or DETR quality of the billets, so that these are carried out in the same place with substantially equal size temperatures from the furnace, 'the billets said introduced in a conventional manner in the same place in the oven and with more or less great advance in Different places along the furnace can be carried out from this as soon as they reach the same desired furnace outlet temperature, after which the billets carried out are then transported transversely axially outside of the furnace in the longitudinal direction thereof until they are brought together with the billets advanced inside the furnace.

Selbstverständlich kann die Erfindung gleichzeitig sowohl bei der Einführung der zu erwärmenden Erzeugnisse in den Ofen als auch bei der Ausführung der erwärmten Erzeugnisse aus dem Ofen angewendet werden.Of course, the invention can be used both in the introduction of the products to be heated into the oven and in the execution of the heated products from the oven.

Die Erfindung kann in Verbindung mit beliebigen Hubbalkenöfen unabhängig von ihrer konstruktiven Ausbildung, von den Antriebsmitteln der Hubbalken und von den Beheizungs- und Regelmitteln des Ofens angewendet werden.The invention can be used in conjunction with any walking beam furnace, regardless of its structural design, the drive means of the walking beam and the heating and regulating means of the furnace.

Insbesondere ist die Erfindung dazu geeignet, in Verbindung mit bereits existierenden Hubbalkenöfen zum Zwecke ihrer Umwandlung in erfindungsgemässe Öfen angewendet zu werden, da die hierfür erforderlichen Änderungen des Ofens nebensächlich sind und nur das Vorhandensein eines ausreichend grossen freien Platzes seitlich neben dem Ofen erfordern.In particular, the invention is suitable for use in connection with already existing walking beam furnaces for the purpose of converting them into furnaces according to the invention, since the necessary changes to the furnace are irrelevant and only require the presence of a sufficiently large free space to the side of the furnace.

Claims (14)

1. Method for the heating of iron works products of different kind and/or initial temperature in walking beam furnaces, characterised thereby, that the heating characteristics of the individual products are determined before the charging into the furnace and, in the case of deviation from the normal characteristics corresponding to the furnace operation, the products concerned are guided externally of the furnace parallelly to its longitudinal and feed direction as far as a place respectively predetermined by their heating characteristics and the products are then introduced laterally through appropriate openings into the walking beam furnace.
2. Method for the heating of iron works products of different kind and/or initial temperature in walking beam furnaces, characterised thereby, that products of different heating characteristics are normally charged in the furnace inlet, advanced, heated and, on reaching their respectively desired furnace exit temperature, guided out of the furnace laterally through respectively appropriate openings and subsequently advanced further externally of the furnace parallelly to its longitudinal and feed direction.
3. Method according to claim 1 or 2, characterised thereby, that the products are advanced in the interior as well as externally of the furnace in the same rhythm and with the same step size in such a manner that a free empty place in the interior of the furnace corresponds to each place occupied by a product externally of the furnace.
4. Method according to one of the preceding claims, characterised thereby, that the products advanced externally of the furnace are heated for the prevention of their cooling-down or for the purpose of their preliminary heating and/or reheating.
5. Walking beam furnace for the heating of iron works products by the method according to one of the claims 1 to 4, characterised thereby, that it displays several lateral furnace inlet openings (11, 12, 13, 41) one succeeding the other in the longitudinal direction of the furnace and/or several lateral furnace exit openings one succeeding the other in the longitudinal direction of the furnace and a conveyor (9, 10) for the products is provided externally of the furnace on at least one side of the furnace beside the furnace in the region of the furnace inlet openings (11, 12, 13, 14) and/or the furnace exit openings, extends in the longitudinal direction of the furnace, is synchronised with or matched to the walking beam conveyor (2, 3) internal of the furnace and advances the products in the same direction and at the same speed as the walking beam conveyor (2, 3) internal of the furnace, wherein push-in means (16, 20) are provided for the introduction of the products into the furnace through a desired one of the lateral furnace inlet openings (11, 12, 13, 14) and for the transfer of the products from the conveyor (9, 10) external of the furnace to the walking beam conveyor (2, 3) internal of the furnace and/or ejector means are provided for the pushing of the products out of the furnace through a desired one of the lateral furnace exit openings and for the transfer of the products from the walking beam conveyor internal of the furnace to the conveyor external of the furnace, as well as inspection and control means for the ordering-in of the supplied products to be heated and/or the products heated in the furnace on the basis of their heating characteristics.
6. Furnace according to claim 5, characterised thereby, that the conveyor (9, 10) external of the furnace is arranged only on the furnace inlet side and associated with a plurality of lateral furnace inlet openings one succeeding the other in the longitudinal direction of the furnace.
7. Furnace according to claim 5, characterised thereby, that the conveyor external of the furnace is arranged only on the furnace exit side in the region of exit openings one succeeding the other in the longitudinal direction of the furnace.
8. Furnace according to claim 5, characterised thereby, that a respective lateral conveyor, which is external of the furnace and extending in the longitudinal direction of the furnace and in the region of a plurality of successive furnace inlet or exit openings, is provided on the furnace inlet side as well as also on the furnace exit side.
9. Furnace according to one of the claims 5 to 8, characterised thereby, that the successive lateral furnace inlet or exit openings are constructed for letting a single product through at a time.
10. Furnace according to one of the claims 5 to 8, characterised thereby, that the lateral furnace inlet or exit openings display a width which corresponds to at least a length portion of the associated conveyor external of the furnace.
11. Furnace according to one of theclaims 5 to 10, characterised thereby, that the conveyor external of the furnace consists of a stepping conveyor, in particular a walking beam conveyor (9, 10), which is driven synchronously with the internal walking beam conveyor (2, 3) in the same rhythm and with the same step size or with such a co-ordination with the internal walking beam conveyor (2, 3) that a free, co-moving empty place on the internal walking beam conveyor (2, 3) always corresponds to an occupied place on the external walking beam conveyor (9, 10).
12. Furnace according to claim 11, characterised thereby, that the fixed beams (2, 9) of the walking beam conveyor (2, 3) internal of the furnace and of the walking beam conveyor (9, 10) external of the furnace in the region of each lateral furnace inlet or exit opening (12, 13, 14) display transversely directed guides (22), which are aligned each to the other and to the respective lateral furnace inlet or exit opening.
13. Furnace according to one of the claims 5 to 12, characterised thereby, that the walking beam conveyor (9, 10) external of the furnace is housed on the furnace inlet or exit side in a thermally insulated chamber (17), in particular one heatable with the aid of the waste gases of the walking beam furnace (1).
14. Furnace according to claim 5 to 13, characterised thereby, that the thermally insulated and heated chamber (17), in which the lateral inlet conveyor (9, 10) external of the furnace is housed, forms an antechamber of the walking beam furnace (1).
EP81108909A 1981-03-31 1981-10-26 Process and walking-beam furnace for the heating of products used in ferrous metallurgy Expired EP0062697B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108909T ATE22171T1 (en) 1981-03-31 1981-10-26 PROCESS AND JACKING-BEAM FURNACE FOR HEATING FERROUS PRODUCTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1248281 1981-03-31
IT12482/81A IT1145959B (en) 1981-03-31 1981-03-31 MOBILE LONGHERONI METHOD AND OVEN FOR THE HEATING OF STEEL PRODUCTS HAVING DIFFERENT BAKING TEMPERATURES AND DIFFERENT CROSS SECTIONS

Publications (3)

Publication Number Publication Date
EP0062697A2 EP0062697A2 (en) 1982-10-20
EP0062697A3 EP0062697A3 (en) 1983-08-03
EP0062697B1 true EP0062697B1 (en) 1986-09-10

Family

ID=11140687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108909A Expired EP0062697B1 (en) 1981-03-31 1981-10-26 Process and walking-beam furnace for the heating of products used in ferrous metallurgy

Country Status (6)

Country Link
US (1) US4420145A (en)
EP (1) EP0062697B1 (en)
AT (1) ATE22171T1 (en)
BR (1) BR8201706A (en)
DE (1) DE3175310D1 (en)
IT (1) IT1145959B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721836A (en) * 1986-05-14 1988-01-26 The United States Of America As Represented By The Secretary Of The Navy Apparatus for transient annealing of semiconductor samples in a controlled ambient
FR2659582B1 (en) * 1990-03-13 1992-06-12 Stein Heurtey DEVICE FOR ENSURING THE UNLOADING AND TRANSFER OF STEEL PRODUCTS.
IT1296715B1 (en) * 1997-11-11 1999-07-15 Danieli Off Mecc PROCEDURE FOR CHECKING THE AXIALITY FOR OUTGOING SHEETS FROM CONTINUOUS CASTING AND RELATED DEVICE

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE135237C (en) *
US3854863A (en) * 1974-01-23 1974-12-17 H Lubold Furnace assembly and method for heating workpieces
JPS5154813A (en) * 1974-11-08 1976-05-14 Chugai Ro Kogyo Kaisha Ltd Marukohenkanetsuro
JPS552753A (en) * 1978-06-21 1980-01-10 Ito Seisakusho:Kk Method and apparatus for soaking treatment for cold billet and hot billet

Also Published As

Publication number Publication date
IT8112482A0 (en) 1981-03-31
IT1145959B (en) 1986-11-12
BR8201706A (en) 1983-02-22
EP0062697A3 (en) 1983-08-03
DE3175310D1 (en) 1986-10-16
EP0062697A2 (en) 1982-10-20
US4420145A (en) 1983-12-13
ATE22171T1 (en) 1986-09-15

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