EP0331937B1 - Rollenherdofen zum Wärmen von Brammen, Blöcken, Knüppeln, Blechen und dergleichen Wärmgut - Google Patents

Rollenherdofen zum Wärmen von Brammen, Blöcken, Knüppeln, Blechen und dergleichen Wärmgut Download PDF

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Publication number
EP0331937B1
EP0331937B1 EP89102655A EP89102655A EP0331937B1 EP 0331937 B1 EP0331937 B1 EP 0331937B1 EP 89102655 A EP89102655 A EP 89102655A EP 89102655 A EP89102655 A EP 89102655A EP 0331937 B1 EP0331937 B1 EP 0331937B1
Authority
EP
European Patent Office
Prior art keywords
furnace
hearth
rollers
roller
space
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP89102655A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0331937A1 (de
Inventor
Paul Freieck
Peter Holz
Horst Mathejka
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.)
Didier Ofu Engineering GmbH
Original Assignee
Didier Engineering GmbH
Didier Ofu Engineering GmbH
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 Didier Engineering GmbH, Didier Ofu Engineering GmbH filed Critical Didier Engineering GmbH
Priority to AT89102655T priority Critical patent/ATE67025T1/de
Publication of EP0331937A1 publication Critical patent/EP0331937A1/de
Application granted granted Critical
Publication of EP0331937B1 publication Critical patent/EP0331937B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F27D25/001—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag comprising breaking tools, e.g. hammers, drills, scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails

Definitions

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Articles (AREA)
EP89102655A 1988-03-05 1989-02-16 Rollenherdofen zum Wärmen von Brammen, Blöcken, Knüppeln, Blechen und dergleichen Wärmgut Expired - Lifetime EP0331937B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89102655T ATE67025T1 (de) 1988-03-05 1989-02-16 Rollenherdofen zum waermen von brammen, bloecken, knueppeln, blechen und dergleichen waermgut.

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=6348943

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89102655A Expired - Lifetime EP0331937B1 (de) 1988-03-05 1989-02-16 Rollenherdofen zum Wärmen von Brammen, Blöcken, Knüppeln, Blechen und dergleichen Wärmgut

Country Status (5)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10007383B4 (de) * 2000-02-18 2008-06-26 Sms Demag Ag Wasserkühlbare Ofenrolle zum Fördern von Werkstücken durch einen Aufwärmofen
CN103322824B (zh) * 2012-03-22 2015-06-17 宝山钢铁股份有限公司 一种炉辊结瘤的处理方法
DE102014224445A1 (de) 2014-11-28 2016-06-02 Schmidt + Clemens Gmbh & Co. Kg Ungekühlte Ofenrolle, und Verfahren zur Herstellung einer ungekühlten Ofenrolle

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR512892A (fr) * 1920-04-01 1921-02-02 Anciens Etablissements Chavann Four à recuire
FR596680A (fr) * 1925-03-25 1925-10-29 Ac Spark Plug Co Procédé et appareil pour la cuisson des objets en céramique
DE523525C (de) * 1929-11-08 1931-04-27 Poetter G M B H Foerdervorrichtung fuer OEfen zur Waermebehandlung von Metallen
GB521003A (en) * 1938-11-08 1940-05-09 Sankey Joseph & Sons Ltd Improvements in furnaces for use in heat treatment of articles or in heating articles for subsequent operations
US2663558A (en) * 1949-01-21 1953-12-22 Blaw Knox Co Furnace conveyer element
US2788957A (en) * 1953-03-30 1957-04-16 Drever Co Refractory roller furnace conveyor system
DE1232997B (de) * 1963-05-09 1967-01-26 Ofu Ofenbau Union G M B H Rollenherd fuer einen Rollenherdofen zur Waermebehandlung von insbesondere metallischem Gut

Also Published As

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

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