EP0225432A2 - Verfahren und Vorrichtung zur Wärmebehandlung - Google Patents

Verfahren und Vorrichtung zur Wärmebehandlung Download PDF

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Publication number
EP0225432A2
EP0225432A2 EP86111599A EP86111599A EP0225432A2 EP 0225432 A2 EP0225432 A2 EP 0225432A2 EP 86111599 A EP86111599 A EP 86111599A EP 86111599 A EP86111599 A EP 86111599A EP 0225432 A2 EP0225432 A2 EP 0225432A2
Authority
EP
European Patent Office
Prior art keywords
conveying
furnace
materials
rollers
conveying rollers
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.)
Withdrawn
Application number
EP86111599A
Other languages
English (en)
French (fr)
Other versions
EP0225432A3 (de
Inventor
Ono Takashi
Ishimoto Takashi
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.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co Ltd
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 Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Publication of EP0225432A2 publication Critical patent/EP0225432A2/de
Publication of EP0225432A3 publication Critical patent/EP0225432A3/de
Withdrawn legal-status Critical Current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
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/021—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces having two or more parallel tracks
    • 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
    • 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 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 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
    • 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
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/40—Arrangements of controlling or monitoring devices
    • 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
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0028—Regulation
    • F27D2019/0059—Regulation involving the control of the conveyor movement, e.g. speed or sequences

Definitions

  • the present invention relates to a method of heating materials to be heated (called simply "materials” hereinafter) and an apparatus therefor, particularly to a heat treatment method and apparatus therefor in which a plurality of materials are heated by being continuously passed through a furnace.
  • Such heat treatment method and apparatus obviates the need for a waiting time such as is required with a conventional method and apparatus and allows the throughput ratio of a furnace to be maintained at a high level.
  • reference number 1 denotes a heat treatment apparatus
  • reference number 2 denotes a furnace formed as a hollow body and provided with an inlet 8 at one end thereof and an outlet 9 at the other end.
  • the furnace is formed such that its width comprises a plurality of longitudinal spaces (three in this embodiment) through which materials can be passed from the inlet 8 toward the outlet 9.
  • the inside of the furnace 2 is divided in the longitudinal direction thereof into a heating and heat-maintaining chamber 3 and a cooling chamber 4.
  • the furnace wall of the heating and heat-maintaining chamber 3 is lined with fireproof and heat insulating materials.
  • the heating and heat-maintaining chamber 3 is provided with a heat source 5 such as a radiant tube, a burner, or an electrical heating wire, and an agitation fan 6 which together form a heating means.
  • Reference number 7 denotes a driving motor for the fan 6.
  • the heat source 5 and the fan 6 wide ones extending over the whole width of the furnace 2 are in some cases used, while in some cases narrow ones are separately provided over each of the plurality of longitudinal spaces.
  • the inlet 8 and the outlet 9 are formed to be wide and are provided with longitudinally movable doors 8a, 8b, 8c, 9a, 9b, 9c, which can be individually opened and closed, respectively.
  • a front chamber 11 extends backward from the inlet side of the furnace and a rear chamber 13 extends forward from the outlet side thereof.
  • the front chamber 11 and the rear chamber 13 are provided with longitudinally movable doors 11a, 11b, 11c, 13a, 13b, 13c, which can be individually opened and closed, respectively.
  • a loading table 12 and a discharging table 14 are provided ahead of the front chamber 11 and beyond the rear chamber 13, respectively.
  • Reference number 15 denotes a conveying system which comprises in this embodiment three lines of conveying components 15a, 15b, 15c.
  • the respective components are constructed as a roller hearth and disposed in parallel with each other so that the conveying loci of the materials conveyed by the components are parallel with each other in the furnace.
  • the above-described conveying components 15 include a great number of roller shafts 16a, 16b, 16c. These roller shafts are provided such as to cross the conveying loci of the materials at right angles and both ends of the shafts are rotatably supported by bearings 22 provided on both side walls 2a, 2b of the furnace 2. The bearings on the right and left sides are sometimes provided on the outside of the furnace.
  • roller shafts are provided in parallel with each other under the conveying loci of the materials through the full length of the furnace 2.
  • Each roller shaft is provided with one of the conveying rollers 17a, 17b, 17c.
  • These conveying rollers have a larger diameter than those of the roller shafts and are formed such as to have a length which does not extend over a plurality of the conveying loci.
  • Each of the conveying rollers 17a, 17b, 17c are provided such that the rollers shown by the same attached letters (a, b, c) show the same conveying loci.
  • Each of the conveying components 15a, 15b, 15c is constructed by a plurality of the conveying rollers 17a, 17b, 17c which show each conveying loci.
  • the distances at which the rollers 17a, 17b, and 17c are arranged with respect to each other are equal, but they may be different from each other in other embodiments.
  • the distances at which the rollers of one conveying component are arranged may be long so as to be suitable for mainly conveying materials having a relatively great length while those of the other component may be small so as to be suitable for mainly conveying relatively short materials.
  • reference numbers 18a, 18b, 18c denote chain sprockets provided at one end of the roller shafts 16a, 16b, 16c, respectively.
  • Reference numbers 19a, 19b, 19c denote chains which are placed over the chain sprockets shown by the symbols 18a, 18b, 18c having the corresponding letters (a, b, c) attached.
  • Reference numbers 20a, 20b, 20c are driving means separately provided for the respective conveying components, so that the conveying speeds of the respective conveying components can be separately determined.
  • the conveying rollers 17a, 17b, 17c are rotated by the separated operation of the driving means 20a, 20b, 20c respectively, and materials 21a, 21b, 21c loaded on the conveying rollers are separately conveyed.
  • conveying systems having the same structure as the above-described conveying system are provided on the loading table 12, the front chamber 11, the rear chamber 13, and the discharging table 14. In general, these conveying systems are separately driven by individual driving mechanisms which are separate from the those of the above conveying system 15.
  • the group comprising materials which need to be heated for the shortest time is shown by reference symbol 21a
  • a group comprising materials which need to be heated for a medium length of time is shown by reference symbol 21b
  • a group comprising materials which need to be heated for the longest time is shown by reference symbol 21c.
  • the materials of each of the groups are conveyed and subjected to heat treatment independently of the other groups. Description will be made of the materials 21a as an example, but the other materials are subjected to the same treatment.
  • the materials 21a provided on the table 12 are sent into the front chamber 11 by opening the door 11a by means of the operation of the conveying systems of the table 12 and the front chamber 11.
  • the door 11a is then closed.
  • the materials 21a sent into the front chamber 11 are then sent into the furnace 2 by opening the door 8a by means of the operation of the conveying systems of the front chamber 11 and the conveying components 15a of the furnace 2.
  • the door 8a is then closed.
  • the materials 21a are conveyed toward the outlet by the conveying components 15a in the furnace 2.
  • the conveying may be carried out by a continuous method or an intermittent method.
  • the materials 21a are heated to a predetermined temperature, are maintained at this temperature (heat-maintaining treatment) in the heating and heat-maintaining chamber 3, and are then cooled in the cooling chamber 4.
  • the door 8a is opened and the materials 21a in the front chamber 11 are sent into the furnace.
  • the door 9a is opened, the materials 21a are sent into the conveying system in the rear chamber 13, and the door 9a is closed.
  • the door 13a is then opened, the materials 21a are transferred onto the table 14 by the conveying systems of the rear chamber 13 and the table 14, and the door 13a is closed.
  • the conveying components 15a, 15b, 15c of each of the groups are respectively conveyed by the conveying components 15a, 15b, 15c in the furnace 2, the conveying components 15a, 15b, 15c are driven at conveying speeds which are different from each other.
  • the speeds are so selected that the time required for the materials conveyed by the conveying components to pass through the heating and heat-maintaining chamber 3 is equivalent to the predetermined time for heating of each of the materials.
  • the conveying speed of each of the conveying components is so selected that the materials belonging to each of the groups are heated for a time sufficient for them to reach a predetermined temperature and then exposed to heat for the predetermined time for heat maintenance therefor.
  • Table I An example is shown in Table I.
  • the materials of each of the groups are conveyed at a suitable speed by the independent conveying components.
  • the materials 21a, 21b, 21c which are subjected to heat treatment display for example, heat curves which are suitable for these materials as shown by the graphs (A), (B), (C) in Fig. 2, respectively.
  • the transverse axis in Fig. 2 shows the time the materials are present in the furnace and corresponds to the position at which the materials are conveyed in the furnace 2 in Fig. 2.
  • the conveying components 15a, 15b, 15c convey the materials in the furnace 2, as described above, since many roller shafts 16a, 16b, 16c are supported by the bearings 22 at both ends, heavy materials can be stably supported and conveyed thereby.
  • the roller shafts of a certain conveying component are placed between the conveying rollers of another conveying component and if the conveying speeds of the conveying components 15a, 15b, 15c are different from each other, the conveying rollers 17a ⁇ 17c of each of the components 15a, 15b, 15c are of such a dimension as to have the above-described thickness.
  • the materials can be stably conveyed independently of the presence of the above roller shafts.
  • Fig. 4 shows another embodiment of a conveying system.
  • Conveying rollers 23, 24 are provided such as to pass through one side wall 2ae and another side wall 2be of a furnace 2e, respectively.
  • the ends of the rollers are free ends on furnace side, while the ends on the outside of the furnace are rotatably supported by bearings 25 provided on a frame (on which the furnace is also mounted) of a heat treatment apparatus.
  • the ends of the rollers 23, 24 on the outside of the furnace are provided with chain sprockets 26.
  • Many of these rollers 23, 24 are disposed in parallel with each other along the conveying loci of the materials.
  • the portions of the rollers 23, 24 within the furnace form conveying components 15ae, 15ce for conveying materials 21ae, 21ce, respectively.
  • the sprockets 26 provided on the rollers 23 on one side are connected to a driving means 20ae through a chain and the sprockets 26 provided on the rollers 24 on the other side are connected to another driving means 20ce in a similar manner.
  • the distances between each of the rollers 23 and between each of the rollers 24 can be made smaller than those in the structure shown in Fig. 3.
  • the portions of the conveying system which can be considered as having the same structure as that shown in Figs. 1 to 3 from the viewpoint of their function are indicated by corresponding symbols with the letter e added and a duplicated description of such portions is omitted.
  • Fig. 5 shows a conveying system in a furnace provided with three lines of conveying components.
  • conveying rollers 23f, 24f on the right and left are formed as hollow cylinders and are provided on the same axis.
  • the ends of each of the conveying rollers 23f, 24f on the inside of the furnace are separated from each other by sufficient distances to allow the conveying loci of the materials 21bf to be formed therebetween.
  • Other conveying rollers 27 having a small diameter are inserted into the right and left conveying rollers 23f, 24f and the right and left ends of the rollers 27 are supported by bearings 28 provided on the outside of the furnace.
  • conveying rollers 27 are provided along the conveying loci of the materials and conveying component 15bf is formed by the center portions of the rollers 27.
  • Chain sprockets 29 are provided on the rollers 27 and connected to a driving means 20bf.
  • the rollers forming the center conveying component 15bf should be of a considerable length. However, even if the rollers are long in this way, both ends are supported by the bearings and it thus becomes possible to stably support and convey the materials.
  • Fig. 6 shows another conveying system provided with two-line conveying components.
  • Conveying rollers 23g are formed into hollow cylinders.
  • Conveying rollers 31 which have a smaller diameter than that of the conveying rollers 23g and which are provided on the same axes as the rollers 23g pass through the conveying rollers 23g. Both ends of these rollers 31 are supported by bearings 32 provided on the outside of a furnace and they are provided with chain sprockets 33 on one of their ends.
  • Many of conveying rollers 31 as described above are provided in correspondence with the rollers 23g and each of the chain sprockets 33 of each of the rollers 31 is connected to driving means 20cg.
  • a roller hearth is shown as an embodiment of the conveying component, but a mesh belt, a chain conveyer, a pusher, or a cast link may be used as other embodiments of the conveying means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Tunnel Furnaces (AREA)
EP86111599A 1985-11-11 1986-08-21 Verfahren und Vorrichtung zur Wärmebehandlung Withdrawn EP0225432A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP252470/85 1985-11-11
JP25247085A JPS62112717A (ja) 1985-11-11 1985-11-11 熱処理方法及び熱処理装置

Publications (2)

Publication Number Publication Date
EP0225432A2 true EP0225432A2 (de) 1987-06-16
EP0225432A3 EP0225432A3 (de) 1988-11-23

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ID=17237827

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111599A Withdrawn EP0225432A3 (de) 1985-11-11 1986-08-21 Verfahren und Vorrichtung zur Wärmebehandlung

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EP (1) EP0225432A3 (de)
JP (1) JPS62112717A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005090889A1 (en) * 2004-03-12 2005-09-29 Wolfe Electric, Inc. Dual belt conveyor oven
EP4212810A4 (de) * 2021-01-20 2024-04-03 Cinoapex Thermo Technology (Suzhou) Co., Ltd. Mehrkanaliger radschienentunnelofen

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5162959B2 (ja) * 2007-05-22 2013-03-13 大同特殊鋼株式会社 熱処理炉の炉内ワーク抽出装置
JP6883718B1 (ja) * 2021-01-29 2021-06-09 株式会社ノリタケカンパニーリミテド 連続焼成炉

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE415144A (de) * 1935-04-25
DE970496C (de) * 1954-01-22 1958-09-25 Ofag Ofenbau Ag Rollenherd
DE1143840B (de) * 1956-02-08 1963-02-21 Iaofuia Ofenbau Union G M B H Rollenherd fuer einen Rollenherdofen
DE1136360B (de) * 1959-02-17 1962-09-13 Iaofuia Ofenbau Union G M B H Rollenherdofen
FR1389180A (fr) * 1964-03-10 1965-02-12 Aeg Four muni de deux voies de roulement, constituées par des rouleaux
AT345169B (de) * 1976-08-25 1978-09-11 Siemens Ag Oesterreich Gerader rollgang fuer stangenfoermiges transportgut

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005090889A1 (en) * 2004-03-12 2005-09-29 Wolfe Electric, Inc. Dual belt conveyor oven
AU2005224615B2 (en) * 2004-03-12 2009-11-05 Wolfe Electric, Inc. Air impingement conveyor oven
EP4212810A4 (de) * 2021-01-20 2024-04-03 Cinoapex Thermo Technology (Suzhou) Co., Ltd. Mehrkanaliger radschienentunnelofen

Also Published As

Publication number Publication date
JPS62112717A (ja) 1987-05-23
EP0225432A3 (de) 1988-11-23

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