EP1607704A1 - Four continu - Google Patents

Four continu Download PDF

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Publication number
EP1607704A1
EP1607704A1 EP03809452A EP03809452A EP1607704A1 EP 1607704 A1 EP1607704 A1 EP 1607704A1 EP 03809452 A EP03809452 A EP 03809452A EP 03809452 A EP03809452 A EP 03809452A EP 1607704 A1 EP1607704 A1 EP 1607704A1
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EP
European Patent Office
Prior art keywords
furnace
unit
continuous
continuous furnace
burner ports
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Withdrawn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
EP03809452A
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German (de)
English (en)
Other versions
EP1607704A4 (fr
Inventor
Tadanori Mizoguchi
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International Customer Service
Original Assignee
International Customer Service
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Filing date
Publication date
Application filed by International Customer Service filed Critical International Customer Service
Publication of EP1607704A1 publication Critical patent/EP1607704A1/fr
Publication of EP1607704A4 publication Critical patent/EP1607704A4/fr
Withdrawn legal-status Critical Current

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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
    • F27B9/36—Arrangements of heating devices
    • 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
    • F27B9/028—Multi-chamber type furnaces
    • 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
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • 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
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/10—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by hot air or gas
    • 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
    • F27B9/2469—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 rollable bodies
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/007—Partitions
    • 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
    • F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • F27B2009/3027—Use of registers, partitions

Definitions

  • the present invention relates to a continuous furnace which utilizes a plurality of unit furnaces continuously, depending on the amount of molded products to be baked or the duration of baking.
  • Continuous furnaces are conventionally known, wherein a continuous baking path is provided through a furnace casing having partitions for sequentially carrying molded products into the furnace casing.
  • the partitions are provided with discharge ports for discharging exhaust gas generated by baking in the baking path, so as to precisely control the temperature in the baking region (JP-3218719-B (JP-6-82162-A)).
  • a continuous furnace having a tunnel-like furnace casing, which is provided with a first baking region, a second baking region, a first cooling region, a second cooling region, and a third cooling region. These regions are divided into cooling air supply ports, burners, waste heat air recovery ports, and furnace gas discharge ports, and the temperature of each region is controlled to keep an appropriate heat curve (JP-2859987-B (JP-5-172465-A)).
  • JP-6-82162-A has partitions in the baking region, these partitions are not of a type to move vertically for controlling the furnace temperature. Thus the furnace temperature is not controlled by the partitions per se, but rather by another mechanism. Further, the invention disclosed in this publication is not of a type wherein burner ports in the facing side walls are arranged out of registration with each other to generate whirl or vortex flows of combustion gas to uniformly apply the gas over molded products.
  • the continuous furnace disclosed in JP-5-172465-A is not of a type to adjust the temperature of molded products by displacement of the partitions, or to apply the combustion gas uniformly over molded products.
  • the present invention aims to solve the above problems. It is therefore an object of the present invention to provide a continuous furnace that may be structured in a small scale, which is nearly a batch type, or a medium or even large scale, by continuously disposing unit furnaces.
  • a detachable, movable, continuous furnace comprising:
  • a continuous furnace of a desired scale may be obtained by continuously arranging a desired number of unit furnaces. Further, by arranging the shielding plates at predetermined locations in the continuous furnace, the temperatures between the shielding plates may be controlled separately. In addition, in each unit furnace between the shielding plates, the gas flame in the form of whirl flows is uniformly applied to molded products, so that ceramic products of better quality may be obtained.
  • the continuous furnace is made movable for transportation to a construction site of tunnels or the like, or to a plant site of a customer, which enables on-site baking of ceramic products such as tiles, or heat treated products of ceramic electronic components such as vehicle parts as metallic products.
  • ceramic products may be baked in a short time, which eliminates need for a stock of ceramic products. This contributes to saving in overall cost.
  • the continuous furnace is made movable, so that tiles and bricks, or heat treated products as metallic products such as vehicle parts, may be baked at a construction site of buildings or the like, or in a plant site of a customer. This eliminates need for warehouses located in a separate place for stock of these products, and transportation of these products, and thus ceramic products may be provided efficiently at a lower cost.
  • the furnace casing when the furnace casing is made in the form of a substantially rectangular cylinder having a pair of facing side walls, one of said burner ports is arranged in each of the facing side walls so that a total of two burner ports per unit furnace are arranged out of registration with each other for forming flames from the two burner ports into a clockwise or counterclockwise whirl flow, or alternatively, two of said burner ports are arranged in each of the upper and lower sections of the facing side walls so that a total of four of said burner ports per unit furnace are arranged out of registration with each other for forming flames from the four burner ports into upper and lower whirl flows in the same clockwise or counterclockwise direction, or in the reverse directions.
  • the burner port in one side wall is arranged near the lower right corner and oriented inwards, while the burner port in the facing side wall is arranged near the lower right corner and oriented inwards.
  • the two burner ports located in the lower sections of the facing side walls are out of registration with each other, so that the flames from the burner ports whirl clockwise.
  • the two burner ports in one side wall are arranged near the upper right and lower left corners, while the two burner ports in the facing side wall are also arranged near the upper right and lower left corners.
  • the burner ports arranged in the facing side walls are out of registration with each other.
  • each of the two burner ports located near the lower left corner of each of the facing side walls similarly projects flame from one side wall toward the other, so that the flames whirl in the reverse direction, i.e., clockwise.
  • the burner ports are arranged near the upper right corners of the facing side walls and oriented inwards in the above embodiment, when the burner ports are arranged near the upper left corners, the flames whirl clockwise in the unit, unlike the above. Further in the above embodiment, the burner ports are arranged near the lower left corners of the facing side walls and oriented inwards, but when the burner ports are arranged near the lower right corners, the flames whirl counterclockwise in the unit.
  • the burner ports near the corners of the side walls may be arranged so that the upper and lower ports are located in the right or left corner for forming the upper and lower flames to whirl in the same counterclockwise or clockwise direction, or one of the flames may be made to whirl counterclockwise while the other clockwise.
  • the directions of projection through the burner ports into the furnace may be adjusted automatically with the control panel or manually within the ranges such that, when one burner port, for example, is provided in each side wall near the upper right corner, the flame from the burner port in one side wall is projected toward the right half of the inner surface of the facing side wall, whereas the flame from the burner port in the facing side wall near the upper right corner is projected toward the left half of the inner surface of the said one side wall on the near side.
  • the flame flow may be optimized for each size of molded products as far as a smooth whirl flow in the clockwise or counterclockwise direction is not disturbed.
  • the shielding plates are moved transversely into the furnace, and moved vertically up and down in the furnace to adjust the height of the plates, so as not to hit molded products being transferred on the conveyor means in the furnace.
  • the temperature between the shielding plates may be adjusted more precisely.
  • the height of the shielding plates interposed between the unit furnaces may be adjusted vertically by manual operation or by automatic operation under control of the control panel.
  • the time and temperature for baking may be adjusted to the values desired in relation to the conveyor means, so that uniform ceramic products may be produced quickly.
  • the shielding plates are made insertable into and drawable out of the furnace by transversely moving the plates from side to side in the furnace so as not to hit molded products being conveyed on the conveyor means.
  • the furnace temperature may be adjusted readily, and maintenance, such as repairing or replacement, of the shielding plates are facilitated by drawing out the shielding plates from either the left or right side.
  • each of the shielding plates is split above the conveyor means into the upper and lower sections, and the lower section is made movable vertically or transversely, while the burners are capable of baking molded products from above and below the conveyor means.
  • the burners are capable of baking molded products from above and below the conveyor means.
  • each shielding plate is made adjustable in height either manually or automatically by means of liftingmeans such as power cylinders and screws, so that the furnace temperature is adjusted more precisely.
  • the conveyor means includes heat-resistant rollers rolling on bearings, and the burners are arranged so as to bake molded products fromabove andbelowthe rollers with heat-resistance.
  • air and gas are introduced into the furnace with a combustion fan and exhaust gas is discharged out of the furnace with an exhaust fan for baking molded products
  • air or cool air is introduced into the furnace with a cooling fan and hot air is discharged outside the furnace with a cooling exhaust fan for rapidly cooling the furnace, to thereby reduce the baking time.
  • air and gas are introduced into the front half of the continuous furnace, and air or cool air is forced-introduced into the rear half of the continuous furnace, while the exhaust gas and combustion air in the furnace are discharged out of both halves.
  • fresh air may be taken into the furnace to facilitate quick baking of molded products.
  • the continuous furnace of the present invention is composed of a plurality of unit furnaces continuously arranged via interposed shielding plates, a suitable continuous furnace may be provided depending on the kind or size of ceramic products, for example, buildingmaterials such as tiles, or ceramic electronic components for vehicle engines.
  • the burner ports in the side walls of the furnace are arranged out of registration with each other, that is, the burner ports are arranged so that the flames from the burner ports in the facing side walls whirl clockwise or counterclockwise in the unit. With this arrangement, the flames substantially uniformly hit molded products positioned in the middle between the side walls, and thus uniformly baked ceramic products may be obtained in a short time.
  • the temperature of the furnace partitioned with the shielding plates may be adjusted suitably depending on the kind or size of molded products to be baked.
  • a continuous furnace is formed with a desired number of unit furnaces and shielding plates.
  • a continuous furnace suitable for each plant may be obtained.
  • combustion conditions according to the degree of shielding in the furnace may be achieved. Further, in the furnace defined between the shielding plates, the burner ports arranged out of registration with each other form whirl or vortex flows of flames to facilitate uniform baking of molded products.
  • Fig. 1 is a schematic longitudinal sectional view of a continuous furnace, wherein unit furnaces are connected in a single row from left to right.
  • Fig. 2 is an enlarged partial explanatory view of Fig. 1.
  • Fig. 3 is a sectional view taken along lines A-A' in Fig. 2.
  • Fig. 4 is a graph showing an example of the relation between the baking time and the baking temperature for producing ceramic products according to the present invention.
  • Fig. 5 is an explanatory view illustrating the line in the continuous furnace including the combustion fan, the interior of the furnace, the exhaust fan and the cooling fan, the interior of the furnace, and the cooling exhaust fan, in this order.
  • Fig. 6 is an enlarged partial detail view of another continuous furnace different from the one shown in Fig. 2.
  • Fig. 6 is an enlarged partial detail view of another continuous furnace different from the one shown in Fig. 2.
  • Fig. 7 is a sectional view taken along lines B-B' in Fig. 6.
  • Fig. 8 is a graph showing the continuous furnace of the present invention composed of ten unit furnaces each of 1 m long, in total of 10 m, for baking ceramic products in 20 minutes, together with the baking temperature against time.
  • Fig. 9 shows a conventional example of a continuous furnace of 45 m long for the baking in 20 minutes as in Fig. 8.
  • each of the reference signs (1, 1', 1" ...) shows one unit of a furnace, and a plurality of such unit furnaces are connected to form continuous furnace A.
  • the furnace A has tubular tunnel 2 with a rounded-top in contour as a furnace casing defined by ceiling 43, side walls 49, and partition walls 5, all made of firebricks (preferably AG BLOCK manufactured by MARUKOSHI KOGYO K.K.), and furnace floor 45.
  • shielding plate 4 which is connected to one end of power cylinder 3 with screws 13 for vertical movement, is disposed in approximately the upper half, while the partition wall 5 and the furnace floor 45 made of firebricks are provided in approximately the lower half.
  • the tubular tunnel 2 passing axially through the unit furnaces (1, 1', 1" ...) is provided with conveyor means rolling on bearings 7 in one way from left to right in Fig. 1 (moving into the tunnel) in an endless manner, i.e., a number of heat-resistant ceramic rollers 6 as an endless conveyor 12.
  • the rollers 6 are rotatably arranged side by side on the endless conveyor 12 associated with motor 10, pulley and chain 11, with the roller axes being supported by the furnace casing (not shown).
  • the shielding plate 4 may be provided for each unit furnace as shown in Fig. 1. Alternatively, one shielding plate 4 may be provided for two or more of the unit furnaces, depending on the baking conditions of molded products.
  • the shielding plate 4 is moved in the vertical direction through the ceiling between the unit furnaces by means of the power cylinder 3, which operation may be performed either automatically or manually, via receiving plate 8 fixed to the furnace casing. Screw 9 is screwed to the receiving plate 8 for adjusting the range of the vertical movement of the shielding plate 4 by the power cylinder 3.
  • each unit furnace (1, 1', 1" are provided with burners 14, 15, 16, 17, which are arranged such that one pair is in the upper section, and the other pair in the lower section, with each pair being arranged out of registration with each other.
  • the upper burner port in one side wall 49 project flame, while the upper burner port in the other side wall project flame in a staggered manner (the same is true for the lower section).
  • the burner ports 14, 15, 16, 17 are arranged either to the right or left in the facing side walls 49 (in the drawings, in one of the side walls, the upper burner port is shown in the upper right corner, while the lower burner port is shown in the lower left corner).
  • combustion fan 30 for projecting gas and air through the burner ports 14 to 17 into the furnace and combusting at the ignition command from the control panel (not shown) (line 32), and a line for discharging the gas generated by combustion in the furnace through combustion flue 22 out of the furnace by means of exhaust gas fan 20 (line 33).
  • line 34 a line for introducing cool air (air) into the furnace by means of cooling fan 31
  • line 35 a line for discharging the combustion gas through cooling flue 23 out of the furnace by means of cooling exhaust fan 21 (line 35).
  • Fig. 4 shows a 60-minute baking process in a medium scale continuous furnace from the initial stage to the final stage.
  • the 60-minutes baking process is divided into the following stages: drying stage 24 for the first 7 minutes, wherein molded products are dried with one or two burners in the unit furnace; temperature raising stage 25 for the following 14 minutes, wherein molded products are baked with three to four burners; high-temperature retaining stage 26 for the following 9 minutes, wherein molded products are baked with all of the four burners; rapid cooling stage 27 for the following 6 minutes, wherein the four burners are extinguished; slow cooling stage 28 for the following 12 minutes, wherein one or two burners are ignited; and cooling stage 29 for the last 12 minutes, wherein all the burners are extinguished.
  • the molded products pass through the drying stage, wherein the temperature in the unit furnace is gradually raised from 143 °C to 271 °C, and then through the temperature raising stage, wherein the firepower is increased by elevating the gas combustion rate of the burners, while the shielding plate in the furnace is lowered, so that the temperature is rapidly raised up to 790 °C. Then the molded products pass through the high-temperature retaining stage over 9 minutes, wherein the temperature in the unit furnace is raised to the maximum of 1125 °C while the temperature increase in the unit furnace is controlled by lowering the shielding plate 4 to the extent to allow passage of the molded products.
  • the molded products pass through the subsequent rapid cooling stage, wherein atmospheric air is introduced into the unit furnace to lower the temperature down to 675 °C, and then through the tunnel of slow cooling stage at an average temperature of 573 °C, and finally through the cooling stage, wherein the shielding plate 4 is raised for cooling.
  • the shielding plate 4 is raised for cooling.
  • Example 1 shown in Figs. 1 to 5 the 60-minute baking process was explained with reference to the embodiment wherein the shielding plate 4 penetrating the ceiling 43 of the unit furnace (1, 1', 1" ...) is vertically movable by means of the power cylinder 3.
  • slot 36 having vertically offset portions is provided for receiving two shielding plates, which are vertically slid with respect to each other like a double sliding door, and inserted transversely into the slot.
  • Upper shielding plate 42 for fixing is inserted into the slot 36 in its upper right portion in Fig.
  • lower shielding plate 43 is disposed vertically movably in the lower left portion of the slot 36, partially overlapping the upper shielding plate 42.
  • the vertical movement of the lower shielding plate 43 is effected by means of power cylinders 3 fixed thereto via telescopic motion of cylinder rods 46.
  • the outer cylinder of the cylinder rod 46 is provided with outer cylinder threads 48, which are screwed to flange 47 fixed to the furnace casing, so that the power cylinder 3 in its entirety is moved vertically for adjusting the range of the telescopic motion of the cylinder rod 46.
  • the upper graph in Fig. 8 shows the relationship between the temperature and the time for baking molded products in the ten unit furnaces shown in the lower figure.
  • molded products are subjected to the drying stage for the first 2 minutes, wherein the temperature is raised from 230 °C to 300 °C; the temperature-raising stage for the following 6 minutes, wherein the temperature is raised to 1200 °C; the high-temperature retaining stage for the following about 2 minutes and 15 seconds, wherein the temperature is maintained at 1200 °C; the rapid cooling stage for the following 4 minutes, wherein the temperature is lowered down to 573 °C; the slow cooling stage for the following 3 minutes and 45 seconds, wherein the temperature is further lowered down to 475 °C; and the cooling stage for the final 2 minutes, to thereby finish the ceramic products in total of 20 minutes.
  • the furnace needs to have an entire length of as long as 45 m for producing the ceramic products from the molded products in the same baking time as in Example 2.
  • the entire length of the furnace can be remarkably reduced to as short as 10 m. This reduction is realizedbecause the baking temperature is quickly raised and lowered while the temperature increase required for the baking is maintained, by rapid raising of the furnace temperature and by rapid extinction and introduction of cool air into the furnace.
  • the rapid raising of the furnace temperature is achieved by the fact that the height of the shielding plates between the unit furnaces is made adjustable, and that the burner ports are arranged in the facing side walls above and below the conveyor means, for example, two of the burner ports are arranged out of registration with each other in each side wall 49 (in Fig. 5, the squares in solid lines represent burners projecting flames from the near side toward the far side, whereas the squares in dotted lines represent burners projecting flames from the far side toward the near side) for forming whirl flows of the flames to uniformly hit the molded products.
  • the second embodiment of the invention particularly differs from the first embodiment in that the upper and lower shielding plates 42, 43 located between the unit furnaces are inserted transversely through a slit (not shown) in one of the side walls 49 of a unit furnace toward the other and positioned therein, while the ceiling 43 is entirely sealed with firebricks.
  • the lower of the two shielding plates is moved up and down within the extent of the slot 36 (in the figures, over almost twice the length of the plate in the vertical direction), by means of power cylinders on both ends of the plate positioned outside the side walls, so that the temperature may be adjusted in each unit furnace above the conveyor means (Needless to say, there is sufficient clearance for allowing passage of molded products on the conveyor means without hitting the shielding plate.).
  • each of the facing side walls is provided with a slit (not shown) of a size to accommodate the thickness of the shielding plate, through which slit the shielding plate is inserted into the furnace.
  • the slits are filled in with refractory fibers, such as ceramic fibers.
  • the lower shielding plate may be moved up and down in the slot 36 either automatically by means of the cylinders, or manually.
  • the metallic parts are subjected to repeated pressing for shaping. I f not annealed, the metallic parts will break at the point where the stress applied by the press is concentrated. Thus the pressing and annealing are repeated alternately.
  • the pressed metallic parts are placed on a thin refractory plate of 5 m to 8 m thick (called "setter").
  • the setter is in turn placed on the ceramic rollers 6, which are the conveyor means for the continuous furnace shown in Fig. 5, and passed through the furnace.
  • the annealing process is started at about 120 °C.
  • the temperature is gradually raised, and after 6.3 minutes the maximum temperature is reached, and maintained for about 4 minutes.
  • the temperature is rapidly lowered for two minutes, and finally slowly lowered for about 8.2 minutes to finish the annealing process.
  • the annealing process was completed in 21 minutes, compared to a conventional annealing process requiring 45 minutes to finish. This is because the flame size of the burners may be adjusted precisely in each area between the shielding plates.
  • rapid burning and cooling are achieved by, in the front half of the furnace, introducing air and gas into the furnace by means of a combustion fan and discharging the exhaust gas out of the furnace by means of an exhaust fan, and in the rear half of the furnace, introducing air or cool air into the furnace by means of a cooling fan and discharging the air out of the furnace by means of the cooling exhaust fan.
  • Fig. 11 shows an example wherein the same vehicle parts as in the example shown in Fig. 10 were annealed in a still shorter time. According to this graph, the annealing process was started at about 120 °C. The temperature was raised for 4.8 minutes, and the maximum temperature (1100 °C) was maintained for about 3.7 minutes (until 8.5 minutes from the start). Then the temperature was rapidly lowered for 1. 5 minutes, and finally slowly lowered for 6 minutes.
  • the vehicle parts were annealed in 16 minutes in total, which is still shorter than in the previous example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
EP03809452A 2002-10-23 2003-10-23 Four continu Withdrawn EP1607704A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002308059 2002-10-23
JP2002308059 2002-10-23
PCT/JP2003/013516 WO2004038315A1 (fr) 2002-10-23 2003-10-23 Four continu

Publications (2)

Publication Number Publication Date
EP1607704A1 true EP1607704A1 (fr) 2005-12-21
EP1607704A4 EP1607704A4 (fr) 2006-08-02

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EP (1) EP1607704A4 (fr)
AU (1) AU2003277516A1 (fr)
WO (1) WO2004038315A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1829843A2 (fr) 2006-03-01 2007-09-05 Audi Ag Procédé d'enrichissement en silicium de matières premières contenant du carbone
RU2502029C1 (ru) * 2012-06-22 2013-12-20 Рафик Багратович Оганесян Челночная печь
US20160024609A1 (en) * 2012-11-19 2016-01-28 Schwartz Gmbh Roller hearth furnace and method for the heat treatment of metal sheets
RU2661293C1 (ru) * 2017-06-02 2018-07-13 Рафик Багратович Оганесян Тепловой агрегат для скоростного обжига пористых заполнителей в неподвижном монослое
RU2729793C1 (ru) * 2019-08-30 2020-08-12 Рафик Багратович Оганесян Агрегат для производства пеностекольных плит
DE102020116593A1 (de) 2020-06-24 2021-12-30 AICHELIN Holding GmbH Wärmebehandlungsanlage und Verfahren zur Herstellung von Formbauteilen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108106423A (zh) * 2017-12-19 2018-06-01 吴松春 一种新型辊道窑内烟气导流板

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932864A (en) * 1988-06-08 1990-06-12 Chugai Ro Co., Ltd. Roller hearth type heat treating furnace
US4966547A (en) * 1988-03-31 1990-10-30 Central Glass Company, Limited Heat treatment method using a zoned tunnel furnace
US20010051323A1 (en) * 2000-05-30 2001-12-13 Oak Nippon Co. Ltd. Convection-type brazing method and its apparatus for metal workpieces
EP1197720A1 (fr) * 2000-10-10 2002-04-17 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Four de frittage continu et son utilisation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2405448B1 (fr) * 1977-10-07 1985-06-28 Welko Ind Spa Installation pour le controle de la conduite des fours a rouleaux pour la cuisson de matieres ceramiques ou similaires
JP2774011B2 (ja) * 1992-02-28 1998-07-09 川崎製鉄株式会社 移動炉床式連続熱処理装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4966547A (en) * 1988-03-31 1990-10-30 Central Glass Company, Limited Heat treatment method using a zoned tunnel furnace
US4932864A (en) * 1988-06-08 1990-06-12 Chugai Ro Co., Ltd. Roller hearth type heat treating furnace
US20010051323A1 (en) * 2000-05-30 2001-12-13 Oak Nippon Co. Ltd. Convection-type brazing method and its apparatus for metal workpieces
EP1197720A1 (fr) * 2000-10-10 2002-04-17 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Four de frittage continu et son utilisation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2004038315A1 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1829843A2 (fr) 2006-03-01 2007-09-05 Audi Ag Procédé d'enrichissement en silicium de matières premières contenant du carbone
EP1829843A3 (fr) * 2006-03-01 2008-07-02 Audi Ag Procédé d'enrichissement en silicium de matières premières contenant du carbone
US7763224B2 (en) 2006-03-01 2010-07-27 Audi Ag Method for siliconizing carbon-containing materials
US9663406B2 (en) 2006-03-01 2017-05-30 Audi Ag Method for siliconizing carbon-containing materials
RU2502029C1 (ru) * 2012-06-22 2013-12-20 Рафик Багратович Оганесян Челночная печь
US20160024609A1 (en) * 2012-11-19 2016-01-28 Schwartz Gmbh Roller hearth furnace and method for the heat treatment of metal sheets
RU2661293C1 (ru) * 2017-06-02 2018-07-13 Рафик Багратович Оганесян Тепловой агрегат для скоростного обжига пористых заполнителей в неподвижном монослое
RU2729793C1 (ru) * 2019-08-30 2020-08-12 Рафик Багратович Оганесян Агрегат для производства пеностекольных плит
DE102020116593A1 (de) 2020-06-24 2021-12-30 AICHELIN Holding GmbH Wärmebehandlungsanlage und Verfahren zur Herstellung von Formbauteilen

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AU2003277516A1 (en) 2004-05-13

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