EP0062697B1 - Procédé et four à longerons mobiles pour le réchauffage de produits sidérurgiques - Google Patents

Procédé et four à longerons mobiles pour le réchauffage de produits sidérurgiques 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
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81108909A
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German (de)
English (en)
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EP0062697A3 (en
EP0062697A2 (fr
Inventor
Iacopo Dr. Ing. Martini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Italimpianti SpA
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Italimpianti SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Italimpianti SpA filed Critical Italimpianti SpA
Priority to AT81108909T priority Critical patent/ATE22171T1/de
Publication of EP0062697A2 publication Critical patent/EP0062697A2/fr
Publication of EP0062697A3 publication Critical patent/EP0062697A3/de
Application granted granted Critical
Publication of EP0062697B1 publication Critical patent/EP0062697B1/fr
Expired legal-status Critical Current

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Classifications

    • 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)

Claims (14)

1. Procédé pour chauffer des produits sidérurgiques de genres différents et/ou à températures initiales différentes dans des fours à longerons mobiles, caractérisé par le fait qu'avant leur introduction dans le four on détermine la caractéristique d'échauffement des différents produits et que dans le cas d'un écart, par rapport à la normale, de la caractéristique qui correspond à l'allure du four, les produits concernés sont déplacés à l'intérieur du four, parallèlement à la direction longitudinale et d'avancement de ce dernier, jusqu'à un emplacement déterminé par sa caractéristique de chauffage, lesdits produits étant ensuite introduits latéralement dans le four à longerons mobiles, à travers des ouvertures correspondantes.
2. Procédé pour chauffer des produits sidérurgiques de genres différents et/ou à températures initiales différentes dans des fours à longerons mobiles, caractérisé par le fait que des produits à caractéristiques d'échauffement différentes sont chargés normalement à l'entrée du four, sont avancés, chauffés et sont, lorsque leur température d'évacuation souhaitée est atteinte, évacués latéralement du four par des ouvertures correspondantes, pour être ensuite avancés à l'extérieur du four, parallèlement à la direction longitudinale et d'avancement de ces derniers.
3. Procédé selon la revendication 1 ou 2, caractérisé par le fait que les produits sont avancés à la même cadence et avec le même pas aussi bien à l'intérieur qu'à l'extérieur du four, et cela de telle façon qu'à chaque emplacement occupé par un produit à l'extérieur du four corresponde un emplacement libre à l'intérieur de celui-ci.
4. Procédé selon l'une des revendications précédentes, caractérisé par le fait que les produits qui sont avancés à l'extérieur du four sont chauffés, en vue d'empêcher leur refroidissement ou en vue de leur préchauffage et/ou leur postchauf- fage.
5. Four à longerons mobiles pour chauffer des produits sidérurgiques par mise en oeuvre du procédé selon l'une des revendications 1 à 4, caractérisé par le fait qu'il comporte plusieurs ouvertures d'entrée (11, 12, 13, 14) qui se suivent latéralement dans la direction de la longueur du four et/ou plusieurs ouvertures d'évacuation du four qui se suivent latéralement dans la direction de la longueur du four ainsi qu'au moins sur un côté du four, près de ce dernier et dans le voisinage des ouvertures d'entrée (11, 12, 13, 14) et/ou des ouvertures de sortie, un transporteur (9, 10) extérieur, s'étendant dans la direction longitudinale du four et servant au transport des produits, lequel transporteur est synchronisé ou accordé au transporteur à longerons mobiles (2, 3) qui se trouve dans le four, et transporte les produits dans la même direction et avec la même vitesse que le transporteur à longerons mobiles (2, 3) situé à l'intérieur du four, des moyens d'introduction (16, 20) servant à introduire les produits dans le four par l'une quelconque des ouvertures d'entrée latérales du four (11, 12, 13, 14) et pour faire passer les produits du transporteur (9, 10) qui se trouvent à l'extérieur du four, sur le transporteur à longerons mobiles (2, 3) intérieur au four et/ou des moyens d'évacuation pour évacuer les produits du four à travers l'une quelconque des ouvertures d'évacuation latérales du four et pour faire passer le produit du transporteur à longerons mobiles intérieur du four sur le transporteur extérieur, alors que des moyens de contrôle et de commande sont prévus pour classer les produits qui sont amenés et qui doivent être chauffés et/ou des produits chauffés dans le four, sur la base de leurs caractéristiques d'échauffement.
6. Four selon la revendication 5, caractérisé par le fait que le transporteur (9, 10) extérieur au four n'est disposé que sur un côté d'introduction du four et est associé à un grand nombre d'ouvertures d'introduction latérales du four, qui se suivent dans la direction longitudinale de celui-ci.
7. Four selon la revendication 5, caractérisé par le fait que le transporteur extérieur au four n'est disposé que sur le côté de sortie du four, dans la zone comportant un grand nombre d'ouvertures latérales de sortie du four, qui se suivent dans la direction longitudinale de ce dernier.
8. Four selon la revendication 5, caractérisé par le fait qu'il est prévu aussi bien sur le côté d'entrée du four que sur le côté de sortie du four respectivement un transporteur extérieur au four, disposé latéralement et s'étendant dans la direction longitudinale du four, dans la zone comportant un grand nombre d'ouvertures d'entrée ou d'ouvertures de sortie successives du four.
9. Four selon l'une des revendications 5 à 8, caractérisé par le fait que les ouvertures d'entrée et de sortie du four, qui se suivent sur le côté, sont réalisées de manière à autoriser le passage d'un seul produit à la fois.
10. Four selon l'une des revendications 5 à 8, . caractérisé par le fait que les ouvertures latérales d'introduction et de sortie du four présentent une largeur qui correspond au transporteur associé et extérieur au four.
11. Four selon l'une des revendications 5 à 10, caractérisé par le fait que le transporteur extérieur au four est constitué par un transporteur pas à pas, en particulier par un transporteur à longerons mobiles (9, 10) qui est entraîné en synchronisme avec le transporteur intérieur à longerons mobiles (2, 3) avec la même cadence et avec le même pas ou avec une telle coordination par rapport au transporteur intérieur à longerons mobiles (2, 3) qu'à un emplacement occupé sur le transporteur extérieur à longerons mobiles (9,10) correspond toujours un emplacement libre, déplaçable en même temps et situé sur le transporteur intérieur à longerons mobiles (2, 3).
12. Four selon la revendication 11, caractérisé par le fait que dans la zone de chacune des ouvertures latérales d'entrée et de sortie du four (12, 13, 14), les longerons fixes (2, 9) du transporteur à longerons mobiles (2, 3) qui se trouvent à l'intérieur du four et du transporteur à longerons mobiles (9, 10) qui se trouve à l'extérieur du four, comportent des guidages (22) pour les produits, lesquels guidages sont dirigés transversalement, en alignement entre eux et avec les ouvertures latérales d'entrée et de sortie correspondantes du four.
13. Four selon l'une des revendications 5 à 12, caractérisé par le fait que le transporteur latéral (9, 10) qui est extérieur au four est logé sur le côté d'entrée et sur le côté de sortie du four dans une chambre isolée thermiquement, ladite chambre étant susceptible d'être chauffée en particulier à l'aide des gaz d'évacuation du four à longerons mobiles (1).
14. Four selon la revendication 13, caractérisé par le fait que la chambre (17) qui est isolée thermiquement et qui est chauffée, et dans laquelle est logé le transporteur latéral d'entrée (9, 10) situé à l'extérieur du four, constitue une chambre amont du four à longerons mobiles (1).
EP81108909A 1981-03-31 1981-10-26 Procédé et four à longerons mobiles pour le réchauffage de produits sidérurgiques Expired EP0062697B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81108909T ATE22171T1 (de) 1981-03-31 1981-10-26 Verfahren und hubbalkenofen zur erwaermung von eisenhuettenerzeugnissen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1248281 1981-03-31
IT12482/81A IT1145959B (it) 1981-03-31 1981-03-31 Metodo e forno a longheroni mobili per il riscaldo di prodotti siderurgici aventi diverse temperature d infornamento e o diverse sezioni trasversali

Publications (3)

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

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ID=11140687

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108909A Expired EP0062697B1 (fr) 1981-03-31 1981-10-26 Procédé et four à longerons mobiles pour le réchauffage de produits sidérurgiques

Country Status (6)

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

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 (fr) * 1990-03-13 1992-06-12 Stein Heurtey Dispositif pour assurer le dechargement et le transfert de produits siderurgiques.
IT1296715B1 (it) * 1997-11-11 1999-07-15 Danieli Off Mecc Procedimento di controllo assialita' per bramme uscenti da colata continua e relativo dispositivo

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE135237C (fr) *
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
DE3175310D1 (en) 1986-10-16
EP0062697A3 (en) 1983-08-03
BR8201706A (pt) 1983-02-22
IT8112482A0 (it) 1981-03-31
EP0062697A2 (fr) 1982-10-20
ATE22171T1 (de) 1986-09-15
IT1145959B (it) 1986-11-12
US4420145A (en) 1983-12-13

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