EP0225432A2 - Heat treatment method and heat treatment apparatus - Google Patents
Heat treatment method and heat treatment apparatus Download PDFInfo
- 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.)
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Classifications
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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
- F27B9/02—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
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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
- F27B9/24—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)
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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
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
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- 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.
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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)
Abstract
Description
- 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.
- There are known methods and apparatus for this type of heat treatment in which a plurality of materials are continuously sent into a furnace from an inlet provided on one side of the furnace, conveyed in succession toward an outlet provided on the other side of the furnace while being heated in the conveying process, and then sent out of the outlet in succession. For example, a method and apparatus is disclosed in the description appearing in the passage from line 18 of the right column on page 211 to line 17 of the left column on page 212 in "Industrial Furnace Handbook" issued by the Tokyo Technocenter in Japan on July 20, 1978. The method as described above is suitable for production of a small variety of goods in large quantities. This method, however, involves some inconvenience when heating a large variety of materials in small quantities. Namely, in the above-described method, it is necessary to reduce the conveying speed for certain kinds of materials which are required to be heated for a long time in the heating process, while it is necessary to increase the conveying speed for other kinds of materials which only need to be heated for a short time. Under such conditions, when a plurality of materials required to be heated for a long time are sent into a furnace and heated at a slow conveying speed, and materials which only need to be heated for a short time are then sent into the furnace and heated therein, there is a problem in that the latter materials following the materials sent into the furnace at a slow conveying speed tend to be heated for an excessive length of time. Thus, there is a problem since it is necessary to wait for a certain period after the materials transferred at a slow conveying speed have been sent out of the furnace before the materials which need to be sent at a high conveying speed can be sent into the furnace. Thus the furnace remains empty for this period of waiting time and the operating efficiency and throughput is thus decreased.
- It is an object of the present invention to provide a heat treatment method and apparatus which is capable of sending a plurality of materials into a furnace from an inlet of the same, conveying the materials in the furnace toward the outlet and heating them continuously during the conveying process, and sending out the materials in succession from the outlet of the furnace.
- It is another object of the present invention to provide a heat treatment method and apparatus in which a variety of materials in several groups each of which requires a heating time which is different from the materials belonging to the other groups can be dealt with by continuously sending each of the groups into a furnace wherein all of the materials can be respectively heated for an appropriately selected time and sent out from the furnace thereafter.
- It is a further object of the present invention to provide such a heat treatment method and apparatus as is described above in which the materials belonging to the groups which are required to be heated for a long time are passed through a furnace at a slow speed, while the materials belonging to the groups which are required to be heated for a short time are passed through the same furnace at a fast speed, so that the materials in all groups can be heated for a suitably selected time.
- It is still further object of the present invention to provide such a heat treatment method and apparatus as is described above wherein, when it is desired that the materials to be conveyed at a slow speed due to the necessity to heat them for a long time are previously sent into a furnace and the materials to be conveyed at a high speed due to the necessity to heat them for a short time are thereafter sent into the same furnace and heated therein, it becomes possible to send the latter materials into the furnace and to heat them without being affected by the presence of the materials which are being conveyed at a low speed which had been previously sent into the furnace by enabling the fast moving materials to pass quickly alongside the slow moving materials.
- Such heat treatment method and apparatus according to the present invention 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.
- Other objects and advantages of the invention will become apparent during the following discussion with reference to accompanying drawings.
-
- Fig. 1 is a longitudinal sectional schematic drawing of a heat treatment apparatus;
- Fig. 2 is a horizontal sectional view of the heat treatment apparatus shown in Fig. 1 which also shows the heat curves of the respective materials conveyed by three conveying components in a furnace;
- Fig. 3 is a schematic drawing of the conveying system in the apparatus shown in Fig. 1; and
- Fig. 4 to 6 are longitudinal sectional views which show embodiments of conveying systems having different structures.
- In Figs. 1 to 3,
reference number 1 denotes a heat treatment apparatus,reference number 2 denotes a furnace formed as a hollow body and provided with aninlet 8 at one end thereof and anoutlet 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 theinlet 8 toward theoutlet 9. The inside of thefurnace 2 is divided in the longitudinal direction thereof into a heating and heat-maintainingchamber 3 and acooling chamber 4. The furnace wall of the heating and heat-maintainingchamber 3 is lined with fireproof and heat insulating materials. The heating and heat-maintainingchamber 3 is provided with aheat source 5 such as a radiant tube, a burner, or an electrical heating wire, and anagitation fan 6 which together form a heating means.Reference number 7 denotes a driving motor for thefan 6. As for theheat source 5 and thefan 6, wide ones extending over the whole width of thefurnace 2 are in some cases used, while in some cases narrow ones are separately provided over each of the plurality of longitudinal spaces. Theinlet 8 and theoutlet 9 are formed to be wide and are provided with longitudinallymovable doors front chamber 11 extends backward from the inlet side of the furnace and arear chamber 13 extends forward from the outlet side thereof. Thefront chamber 11 and therear chamber 13 are provided with longitudinallymovable doors front chamber 11 and beyond therear chamber 13, respectively. -
Reference number 15 denotes a conveying system which comprises in this embodiment three lines ofconveying components conveying components 15 include a great number ofroller shafts bearings 22 provided on bothside walls furnace 2. The bearings on the right and left sides are sometimes provided on the outside of the furnace. Many of these roller shafts are provided in parallel with each other under the conveying loci of the materials through the full length of thefurnace 2. Each roller shaft is provided with one of theconveying rollers conveying rollers conveying components conveying rollers rollers conveying system 15,reference numbers roller shafts Reference numbers 19a, 19b, 19c denote chains which are placed over the chain sprockets shown by thesymbols Reference numbers - In the
conveying system 15 comprising such a structure, theconveying rollers materials - Furthermore, conveying systems having the same structure as the above-described conveying system are provided on the loading table 12, the
front chamber 11, therear 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 theabove conveying system 15. - Next, description will be made of the heat treatment of many different materials by the above-described heat treatment apparatus. In this embodiment, 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 byreference symbol 21b, and a group comprising materials which need to be heated for the longest time is shown byreference 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 thematerials 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 thefront chamber 11 by opening thedoor 11a by means of the operation of the conveying systems of the table 12 and thefront chamber 11. Thedoor 11a is then closed. Thematerials 21a sent into thefront chamber 11 are then sent into thefurnace 2 by opening thedoor 8a by means of the operation of the conveying systems of thefront chamber 11 and theconveying components 15a of thefurnace 2. Thedoor 8a is then closed. Thematerials 21a are conveyed toward the outlet by theconveying components 15a in thefurnace 2. The conveying may be carried out by a continuous method or an intermittent method. As described above, during the conveying process of thematerials 21a, thematerials 21a are heated to a predetermined temperature, are maintained at this temperature (heat-maintaining treatment) in the heating and heat-maintainingchamber 3, and are then cooled in thecooling chamber 4. When a vacant space is created in the furnace adjacent to theinlet 8 with the movement of thematerials 21a, thedoor 8a is opened and thematerials 21a in thefront chamber 11 are sent into the furnace. When thematerials 21a are completely cooled in such a manner as described above, thedoor 9a is opened, thematerials 21a are sent into the conveying system in therear chamber 13, and thedoor 9a is closed. Thedoor 13a is then opened, thematerials 21a are transferred onto the table 14 by the conveying systems of therear chamber 13 and the table 14, and thedoor 13a is closed. - When the
materials components furnace 2, the conveyingcomponents chamber 3 is equivalent to the predetermined time for heating of each of the materials. More specifically, 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. An example is shown in Table I. - As seen from the table, the materials of each of the groups are conveyed at a suitable speed by the independent conveying components. As a result, the
materials furnace 2 in Fig. 2. - When the conveying
components furnace 2, as described above, sincemany roller shafts bearings 22 at both ends, heavy materials can be stably supported and conveyed thereby. In addition, 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 conveyingcomponents rollers 17a∼17c of each of thecomponents - Fig. 4 shows another embodiment of a conveying system. Conveying
rollers 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 bybearings 25 provided on a frame (on which the furnace is also mounted) of a heat treatment apparatus. The ends of therollers chain sprockets 26. Many of theserollers rollers - The
sprockets 26 provided on therollers 23 on one side are connected to a driving means 20ae through a chain and thesprockets 26 provided on therollers 24 on the other side are connected to another driving means 20ce in a similar manner. - In the conveying system constructed as described above, the distances between each of the
rollers 23 and between each of therollers 24 can be made smaller than those in the structure shown in Fig. 3. Thus, it becomes possible to convey short materials. 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. - (Furthermore, the same portions in following drawings are also shown by symbols with the letters f, g, in that order, respectively added thereto from the same viewpoint; duplicated descriptions of these portions are also omitted.
- Fig. 5 shows a conveying system in a furnace provided with three lines of conveying components. In this conveying system, conveying
rollers rollers rollers 27 having a small diameter are inserted into the right and left conveyingrollers rollers 27 are supported bybearings 28 provided on the outside of the furnace. Many of the above-described conveyingrollers 27 are provided along the conveying loci of the materials and conveying component 15bf is formed by the center portions of therollers 27.Chain sprockets 29 are provided on therollers 27 and connected to a driving means 20bf. - In the conveying system constructed as in the above, 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. Conveyingrollers 31 which have a smaller diameter than that of the conveyingrollers 23g and which are provided on the same axes as therollers 23g pass through the conveyingrollers 23g. Both ends of theserollers 31 are supported bybearings 32 provided on the outside of a furnace and they are provided withchain sprockets 33 on one of their ends. Many of conveyingrollers 31 as described above are provided in correspondence with therollers 23g and each of thechain sprockets 33 of each of therollers 31 is connected to driving means 20cg. - In this specification, 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.
- As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that the invention is not limited to the specific embodiments thereof except as defined in the appended claims.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25247085A JPS62112717A (en) | 1985-11-11 | 1985-11-11 | Method and apparatus for heat treatment |
JP252470/85 | 1985-11-11 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0225432A2 true EP0225432A2 (en) | 1987-06-16 |
EP0225432A3 EP0225432A3 (en) | 1988-11-23 |
Family
ID=17237827
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86111599A Withdrawn EP0225432A3 (en) | 1985-11-11 | 1986-08-21 | Heat treatment method and heat treatment apparatus |
Country Status (2)
Country | Link |
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EP (1) | EP0225432A3 (en) |
JP (1) | JPS62112717A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005090889A1 (en) * | 2004-03-12 | 2005-09-29 | Wolfe Electric, Inc. | Dual belt conveyor oven |
EP4212810A4 (en) * | 2021-01-20 | 2024-04-03 | Cinoapex Thermo Technology (Suzhou) Co., Ltd. | Multi-channel wheel-rail tunnel kiln |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5162959B2 (en) * | 2007-05-22 | 2013-03-13 | 大同特殊鋼株式会社 | In-furnace workpiece extraction device for heat treatment furnace |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR805248A (en) * | 1935-04-25 | 1936-11-14 | Improvements to conveyor furnaces | |
DE970496C (en) * | 1954-01-22 | 1958-09-25 | Ofag Ofenbau Ag | Roller hearth |
DE1136360B (en) * | 1959-02-17 | 1962-09-13 | Iaofuia Ofenbau Union G M B H | Roller hearth furnace |
DE1143840B (en) * | 1956-02-08 | 1963-02-21 | Iaofuia Ofenbau Union G M B H | Roller hearth for a roller hearth furnace |
FR1389180A (en) * | 1964-03-10 | 1965-02-12 | Aeg | Furnace fitted with two running tracks, formed by rollers |
DE2718737A1 (en) * | 1976-08-25 | 1978-03-02 | Siemens Ag | Multiple roller conveyor for steel bars - has parallel tracks each formed by aligned pulleys with different transfer speeds (OE 15.12.77) |
-
1985
- 1985-11-11 JP JP25247085A patent/JPS62112717A/en active Pending
-
1986
- 1986-08-21 EP EP86111599A patent/EP0225432A3/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR805248A (en) * | 1935-04-25 | 1936-11-14 | Improvements to conveyor furnaces | |
DE970496C (en) * | 1954-01-22 | 1958-09-25 | Ofag Ofenbau Ag | Roller hearth |
DE1143840B (en) * | 1956-02-08 | 1963-02-21 | Iaofuia Ofenbau Union G M B H | Roller hearth for a roller hearth furnace |
DE1136360B (en) * | 1959-02-17 | 1962-09-13 | Iaofuia Ofenbau Union G M B H | Roller hearth furnace |
FR1389180A (en) * | 1964-03-10 | 1965-02-12 | Aeg | Furnace fitted with two running tracks, formed by rollers |
DE2718737A1 (en) * | 1976-08-25 | 1978-03-02 | Siemens Ag | Multiple roller conveyor for steel bars - has parallel tracks each formed by aligned pulleys with different transfer speeds (OE 15.12.77) |
Cited By (3)
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 (en) * | 2021-01-20 | 2024-04-03 | Cinoapex Thermo Technology (Suzhou) Co., Ltd. | Multi-channel wheel-rail tunnel kiln |
Also Published As
Publication number | Publication date |
---|---|
EP0225432A3 (en) | 1988-11-23 |
JPS62112717A (en) | 1987-05-23 |
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