JP2008105044A - Continuous furnace for brazing of aluminum product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous furnace for brazing of aluminum products, the furnace that can smoothly hold a transporting roller, without having deformation or change in position of the muffle hole for the transporting roller to penetrate, through thermal expansion or contraction of the holding part even under rapid heating or rapid cooling. <P>SOLUTION: In the continuous furnace, the heating zone and the water cooling zone are structured such that a heating chamber and a water cooling zone are provided with a carbon muffle 31 and a carbon floor board in the furnace wall 28 and the water cooling wall, with a hermetically sealed box 39 provided on both sides of the furnace wall 26. The transporting roller house includes a plurality of transporting roller groups in which a plurality of transporting rollers 19 are lined up in parallel in a transporting direction. The transporting roller 19 has both ends extended outward, penetrating a supporting hole 36 formed on the side wall 35 of the carbon muffle 31, and is concentrically fixed on a roller supporting shaft 37, with an interlocking mechanism 26 installed that is linked with the plurality of transporting rollers 19. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a continuous furnace for brazing aluminum products, which is used for brazing aluminum products, and in which a heating zone, a water cooling cooling zone and an air cooling cooling zone are continuously arranged.

  Conventionally, in a continuous furnace in which a heating zone, a water cooling cooling zone, and an air cooling cooling zone are continuously arranged for heat treatment and brazing of metal products, means for conveying the metal products to be heat treated, and problems thereof Etc. are as follows.

(1) Belt conveyor Heat loss is high because belts with large heat capacity are heated and cooled together with metal products to be heat-treated. Moreover, since the conveyance speed is constant, rapid cooling cannot be performed by rapidly feeding into the water-cooled cooling chamber. If the speed is adjusted for each zone, such as a heating zone and a water cooling / cooling zone, the structure becomes complicated and inappropriate. In addition, the structure which utilized the belt conveyor which consists of a metal mesh belt for the continuous furnace for brazing of aluminum products is well-known (refer patent document 1).

(2) Tray pusher Since the conveyance speed is constant, rapid cooling cannot be performed by rapidly feeding into the water-cooled cooling chamber. Moreover, since the metal product to be heat-treated is transported (heated or cooled) using a tray having a large heat capacity, the energy loss is large.

  As a conventional example using a tray pusher, in a continuous furnace, a graphite tray on which a heat-treated product is placed is fed into a heating furnace by a pusher method, and then the tray is conveyed in a cooling chamber by a roller hearth. It is publicly known (see Patent Document 2).

(3) Roller Hearth The metal product to be heat-treated can be rapidly fed into the heating chamber or the cooling chamber by changing the conveyance speed for each zone, so that the metal product can be rapidly heated and cooled. . In addition, it is possible to smoothly carry heavy metal products, densely placed metal products, and the like. Techniques using a roller hearth as a furnace conveying means are known (see Patent Documents 3 and 4).

  By the way, in brazing of aluminum products, when the temperature is raised in the air in a heating furnace, the aluminum products are easily oxidized, and when the brazing material and the flux are also oxidized, the quality is hindered.

Therefore, the present applicants formed the inner surface of the furnace inner wall with a carbonaceous material such as graphite, and the nitrogen atmosphere gas containing a small amount of oxygen mixed in the furnace with the carbonaceous material such as graphite forming the inner wall of the furnace. A small amount of CO ₂ is brought into contact to keep the oxygen concentration in the furnace atmosphere gas low, and a baffle is provided to cover the belt conveyor (mesh belt) in the furnace to realize convection heating and oxygen in the furnace A continuous furnace for brazing aluminum products that keeps the concentration low has already been proposed (see Patent Document 1).

JP 2004-050223 A JP 2004-143565 A Japanese Patent Laid-Open No. 08-233470 JP 08-313161 A

  In the continuous furnace for brazing aluminum products, when using transport means such as belt conveyors and tray pushers, install a muffle case in the furnace and insert an inert gas such as nitrogen gas or argon gas into the muffle case. The oxygen concentration in the muffle can be reduced to 50 ppm or less.

  By the way, in a belt conveyor furnace and a tray pusher furnace, since the heat capacity of a belt and a tray is large, the loss of energy is large for heating and cooling, and it is not necessarily preferable in terms of energy saving. Moreover, since the conveyance speed of the belt and the tray is constant, the belt and the tray cannot be rapidly fed into the cooling chamber for rapid cooling.

  In particular, in recent years, there has been a strong demand for energy saving while reducing the time required for heating and cooling by rapid heating and rapid cooling to improve the aluminum material. For example, in an aluminum heat exchanger fin or the like, an alloy element is added to make it thin and strong, but in brazing such an aluminum product, when it is heated at 600 ° C. and then rapidly cooled to 300 ° C. It is said that a stronger effect is produced. For this reason, the cooling time which conventionally required 5 to 6 minutes is required to be about 3 minutes.

  As described above, in the continuous furnace for brazing aluminum products provided with a metal muffle, roller hearth is used as a conveying means from the viewpoints of reduction of oxygen concentration in the furnace, energy saving, ease of control of feeding speed, transportation of heavy objects, etc. It is desirable to provide

  However, in a continuous furnace for brazing aluminum products in which a metal muffle is provided in the furnace, no roller hearth is provided as a conveying means, and there has been no such idea.

  The reason is considered as follows. When a metal muffle is installed in a continuous furnace for brazing aluminum products, heat treatment can be performed in a state where the oxygen concentration is reduced in an inert gas atmosphere such as nitrogen gas, which is extremely beneficial for maintaining quality. . However, the metal muffle is expanded by being heated in the heating furnace.

For example, when a metal muffle is formed of a metal material having a thermal expansion coefficient of 17 × 10 ⁻⁶ ° C.− ¹ , when the temperature in the heating furnace is 600 ° C., the metal muffle expands by 10.2 mm per meter. Therefore, a metal muffle having a length of about 10 m expands by 102 mm as a whole.

  By the way, when a muffle is provided in the roller hearth, the support shafts (rotating shafts) at both ends of the transport roller are rotatably supported through the support holes formed in the side walls of the metal muffle, and are allowed to stand at room temperature. A drive mechanism is disposed outside the metal muffle.

  However, as described above, the metal muffle has a large thermal expansion, and in particular, the position of the support hole greatly changes or deforms with respect to the support shafts at both ends of the transport roller due to the thermal expansion in the longitudinal direction (transport direction) of the heating furnace. For this reason, the support shafts at both ends of the roller cannot be supported smoothly, and the support shaft, the transport roller or the muffle are damaged, leading to air intrusion into the furnace and an increase in the oxygen concentration in the furnace.

  Therefore, in the continuous brazing furnace for brazing of aluminum products provided with a metal muffle, it is contrary to common sense that roller hearth is adopted as a conveying means, and there was no such idea. An object of the present invention is to provide a conveying means in a heating furnace in a continuous furnace for brazing aluminum products provided with a metal muffle in order to satisfy technical demands such as reduction of oxygen concentration in the furnace, energy saving and feed rate. It is to realize a configuration employing a roller hearth.

  Note that Patent Document 2 has already disclosed a continuous furnace in which a tray is conveyed in a cooling chamber by roller hearth. However, the invention described in Patent Document 1 aims to prevent tray damage due to a rapid temperature change when rapidly cooling a product heated to a high temperature, and in order to solve this problem, Is characterized by using a graphite tray having a constant temperature.

  That is, the invention described in Patent Document 2 is not intended to enable the conveyance speed to be adjusted by the conveyance roller in the heating zone, the water cooling cooling zone, and the air cooling cooling zone as in the present invention. The problem is that the roller itself expands and the support portion of the muffle for the transport roller is deformed and cannot be supported smoothly. This point is also an invention that has nothing to do with the thermal deformation of the muffle in Patent Documents 1, 3, and 4.

  In order to solve the above-mentioned problems, the present invention is a continuous furnace for brazing aluminum products having a heating zone, a water cooling cooling zone, an air cooling cooling zone, and a roller hearth, wherein the heating zone and the water cooling cooling zone are furnace walls. A heating chamber having a carbon muffle and a carbon floor plate and a water cooling / cooling zone in the water cooling wall, and the roller hearth includes a plurality of conveying roller groups in which a plurality of conveying rollers are arranged in parallel in the conveying direction. Each group is formed so as to be independently driven by a motor, and both ends of the transport roller extend through the holes formed in the side wall and the water-cooled wall of the carbon muffle and extend to the roller support shaft. The roller support shaft is concentrically fixed, and the roller support shaft is rotatably supported on the outer surface of the furnace wall and the water cooling wall via a bearing. Providing brazing continuous furnace product.

  In order to solve the above-mentioned problems, the present invention is a continuous furnace for brazing aluminum products having a heating zone, a water cooling cooling, an air cooling cooling zone, and a roller hearth, wherein the heating zone has a carbon muffle in the furnace wall. It has a heating chamber to which the atmospheric gas in the furnace is supplied and has boxes sealed on both sides of the furnace wall, the water cooling cooling zone has a carbon floor plate in the water cooling wall, and the air cooling is cooled by a cooling blower. The roller hearth includes a plurality of groups of conveying rollers in which a plurality of conveying rollers are arranged in parallel in the conveying direction, and each of the conveying roller groups is independent by a motor. The both ends of the conveying roller extend outwardly through holes formed in the side wall and the water cooling wall of the carbon muffle, The roller support shaft extends through the furnace wall and the water cooling wall into the box, and is rotatably supported on the outer surface of the furnace wall via a bearing. One end portion of the roller support shaft is provided with an interlocking mechanism that interlocks with other rollers constituting the transport roller group to which the transport roller supported by the roller support shaft belongs in the box. A continuous furnace for brazing aluminum products is provided.

  It is preferable that the furnace atmosphere gas is supplied into the box.

  In the box, it is preferable that a driving mechanism driven by a motor is provided at an end portion of a roller support shaft that supports one of the plurality of rollers constituting the transport roller group.

The continuous furnace for brazing aluminum products according to the present invention produces the following effects.
(1) Since the muffle provided in the furnace is made of a stable carbon material with a small change in thermal expansion coefficient even when the temperature changes, the position of the support hole of the muffle that rotatably supports the support shaft of the transport roller Therefore, there is little deformation of the support hole due to thermal expansion, and therefore, the support roller and its support shaft and muffle are supported smoothly and smoothly without being damaged to prevent intrusion of air outside the furnace. I can do things.

(2) Since the roller hearth that allows finer speed control can be used as the transport means, it is possible to appropriately adjust the transport speed of the aluminum product in the furnace in response to rapid heating and rapid cooling. In addition, rapid cooling can be achieved, and the energy saving effect can be enhanced and the material can be improved.

(3) Since the belt conveyor having a relatively large heat capacity does not run in the furnace, the amount of heat required for heating the belt conveyor is eliminated, the energy saving effect is improved, and even a heavy aluminum product can be conveyed in the furnace.

  The best mode for carrying out a continuous furnace for brazing aluminum products according to the present invention will be described below with reference to the drawings based on the embodiments.

  FIG. 1 is a diagram showing an overall configuration of a continuous furnace 51 for brazing aluminum products. The continuous furnace 51 includes a heating furnace 52 (heating zone), a slow cooling chamber 8, a water cooling cooling chamber 53, and an air cooling cooling chamber 54. A roller hearth 55 is provided through the heating chamber 52, a roller hearth 56 is provided through the slow cooling chamber 8 and the water cooling cooling chamber 53, and a roller hearth 57 is provided through the air cooling cooling chamber 54. The roller hearts 55, 56, and 57 are configured to be independently controlled and driven by motors 58, 59, and 60, respectively.

  A feature of the present invention is a configuration in which a muffle (a case for covering the roller hearth provided in the heating furnace, not shown in FIG. 1) covering the roller hearth 55 in the heating furnace 52 is provided. As described above, such a configuration has conventionally been an unconceived configuration contrary to common sense. However, in the present invention, by using a graphite muffle having a low coefficient of thermal expansion as the muffle, the roller support by the thermal expansion of the muffle is used. It was able to solve the problems caused by the deformation and position change of the shaft support hole.

Incidentally, when the carbon muffle material is formed of a carbon material having a thermal expansion coefficient of 2 × 10 ⁻⁶ ° C.− ¹ , when the temperature in the heating furnace is 600 ° C., it expands only 1.2 mm per meter. Therefore, in a heating furnace using a carbon muffle case with a length of about 10 m, it expands only 12 mm as a whole. However, since the carbon muffle is assembled into a building block in terms of manufacturing technology, the length of a single unit is increased. Is about 500 mm, and since a buffer material is inserted into the fitting portion, deformation of the support hole of the roller support shaft or change in position due to thermal expansion of the muffle due to thermal expansion is not a problem at all.

  In FIG. 1, the aluminum product conveyed in the heating furnace 51 by the roller hearth 55 is heated to about 600 ° C. and brazed. The room temperature of the slow cooling chamber 8 is 500 to 600 ° C., and the aluminum product is slowly cooled. Further, it is cooled in the water cooling cooling chamber 53 and the air cooling cooling chamber 54.

  In the present invention, the roller hearth 55 can be driven independently of the roller hearth 56 by the motor 58, and the roller hearth 57 can be driven separately by the motor 60, whereby the aluminum product heated to about 600 ° C. in the heating chamber 52. Can be conveyed through the slow cooling chamber 8 and the water cooling cooling chamber 53 and cooled to about 300 ° C. in about 3 minutes.

  In the present invention, by adopting the above configuration, the quality is improved by the action of lowering the oxygen concentration by carbon muffle, the cooling time is shortened by independent speed control by roller hearth, and the energy saving by using roller hearth with relatively low heat capacity. As a result, the aluminum material is reformed. Hereinafter, the specific configuration of the present invention will be further described in detail with reference to examples.

(Constitution)
FIG. 2 is a diagram for explaining the overall configuration of a continuous furnace for brazing aluminum products according to the present invention. Here, in order to make the explanation easier to understand, an explanation will be given with an embodiment having a relatively short heating furnace. Fig.3 (a) is a figure which shows the AA sectional drawing of the heating chamber of FIG. 2, The partial enlarged view is shown in FIG.3 (b). A continuous furnace 1 for brazing aluminum products according to the present invention includes a heating zone 2, a water cooling / cooling zone 3, a slow cooling chamber 8, an air cooling / cooling zone 4, and a roller hearth 5.

  The heating zone 2 includes a heating chamber inlet 6 and a plurality of heating chambers 7. The heating chamber inlet 6 can be opened and closed by an inlet door 9 movable in the vertical direction. Normally, the heating chamber inlet 6 is slightly opened during the heat treatment, and a furnace atmosphere gas such as nitrogen is exhausted from the inlet door 9. In the heating zone 2 of the present embodiment, three heating chambers 7-1, 7-2, and 7-3 partitioned by a partition frame 10 are provided as appropriate, and an aluminum product 11 to be brazed is attached to a heater 12 ( Heat to about 600 ° C. in FIG.

  In the heating chamber 7, an atmosphere gas in the furnace such as nitrogen is introduced into the three heating chambers 7 through the box 39 described later by the supply pipe 50 from the outside. The furnace atmosphere gas is circulated by a fan (not shown) in the heating chamber 7 and is discharged from the outlet door 17 through the heating chamber inlet 6 and the water-cooled cooling chamber outlet 18.

  The water cooling cooling zone 3 has a water cooling cooling chamber 13. The water-cooled cooling chamber 13 cools the aluminum product 11 heated to, for example, about 600 ° C. to about 300 ° C. in a water-cooled jacket type cooling chamber.

  The air-cooling cooling chamber of the air-cooling cooling zone 4 is provided with a forced cooling blower 15 on the upper side, and the forced cooling blower 15 forcibly air-cools the aluminum product 11. For example, the water cooling cooling chamber is cooled to about 300 ° C. The aluminum product 11 is cooled to room temperature + 10 ° C.

  The water-cooled cooling chamber outlet 18 can be opened and closed by a vertically movable outlet door 17. The outlet door 17 is opened during normal heat treatment, and the furnace atmosphere gas such as nitrogen in the water-cooled cooling chamber 3 is opened. It is configured to exhaust from the water-cooled cooling chamber outlet 18.

  The roller hearth 5 is a conveying means for conveying the aluminum product 11 to be brazed from the heating chamber inlet 6 to the air-cooling cooling chamber outlet 16 in the continuous furnace 1 for brazing aluminum products. This roller hearth 5 is provided with a plurality of groups 20, 21, and 22 having a plurality of conveyance rollers 19 arranged in parallel in the conveyance direction, and each conveyance roller group is independently driven by a separate motor 22, 23, 24. Formed to be. Details of the interlock mechanism 26 that rotates the transport rollers 19 of the transport roller groups 20, 21, and 22 and the drive mechanism 27 that is driven by a separate drive motor 22, 23, and 24 for each roller group will be described later.

Next, the specific structure of the continuous furnace 1 for brazing aluminum products according to the present invention will be further described with reference to FIGS. The furnace wall 28 of the heating zone 2 includes a metal outer wall 29 and a heat insulating wall 30 inside the outer wall. In the cavity surrounded by the heat insulating wall 30, a graphite outer muffle 31 (tunnel-shaped muffle formed of a carbon material) having a rectangular cross section is disposed as a carbon muffle. The graphite outer muffle 31 has a function of forming CO + CO ₂ in the furnace and reducing oxidation of the flux and the aluminum product 11.

  A graphite inner muffle 33 is provided in the graphite outer muffle 31, and a heat treatment chamber 32 is provided in the center of the graphite muffle 33 in the vertical direction. The heaters 12 are horizontally disposed above and below the graphite muffle 33 so as to penetrate the graphite muffle 31 and are attached to the furnace wall 28 via bushes 40.

  In the heat treatment chamber 32 inside the muffle 33 in the graphite, a roller hearth 5 is disposed at the lower part. The roller hearth 5 has a group of conveyance rollers including a plurality of conveyance rollers 19 provided horizontally at intervals in the conveyance direction. In the continuous furnace for brazing aluminum products of the present invention, a plurality of conveying roller groups are provided as the roller hearth 5 and the speed can be appropriately controlled for each group. In this embodiment, as shown in FIG. 2. Three transport roller groups 20, 21, and 22 are provided corresponding to the water cooling cooling zone 3 and the air cooling cooling zone 4.

  The conveying roller 19 which is a component of the conveying roller group 20, 21, 22 passes through both ends of the conveying roller 19 so as to be rotatable through support holes 36 formed in the side walls 35 on both sides of the outer graphite muffle 31. The outer end is fixed to the inner end of the roller support shaft 37 such that the axis of the graphite muffle 31 and the axis of the roller support shaft 37 coincide with each other, that is, concentrically.

  Boxes 39 made of a metal plate 38 and sealed are formed on both the left and right sides of the furnace wall 28. The left and right roller support shafts 37 respectively penetrate the furnace wall 28 and extend further into the box 39 on the outer side through the bush 34 fixed to the furnace wall 28. The left and right roller support shafts 37 are rotatably supported by bearings 41 fixed to the outer wall 29 of the furnace wall 28 in the box 39.

  In this embodiment, at least one of the left and right roller support shafts 37 is, as shown in FIGS. 3A and 3B, the right roller support shaft 37 extends further outward from the bearing 41 and has an outer end portion. Is provided with an interlocking mechanism 26. That is, an interlocking sprocket 42 is attached to the outer end portion of the roller support shaft 37. The interlocking sprocket 42 is attached to the outer end portions of all the roller support shafts 37 of the plurality of transport rollers 19 constituting the transport roller group 20, 21, 22 and a chain (not shown) for interlocking them is attached. It is mounted.

  A predetermined one of the plurality of transport rollers 19 constituting the transport roller groups 20, 21, and 22, for example, the roller support shaft 37 ′ of the transport roller 19 ′ of the heating zone 2 shown in FIG. Further, a drive mechanism 27 is provided at the outer end. That is, a driven sprocket 43 is attached to the outer end of the roller support shaft 37 ′, and a driving sprocket 45 is attached to the rotary drive shaft 44 supported by the bearing 41 at the bottom of the right box 39. It has been.

  Outside the box 39, a driven sprocket 46 is attached to the rotational drive shaft 44 and is driven to rotate by a motor sprocket 48 of the motor 23 via a chain 47. The drive mechanism of the transport roller group 20 in the heating zone 2 has been described above, but the interlocking mechanism 26 and the drive mechanism 27 of the transport roller group 21 in the water-cooled cooling zone 3 have the same configuration.

  The left and right boxes 39 of the heating chamber 7 are connected to a supply pipe 50 for an atmosphere gas in the furnace such as nitrogen, and the furnace atmosphere gas is supplied in a pressurized state. The atmosphere gas in the furnace is supplied into the outer muffle 31 outside the graphite through the gap between the bush 40 and the heater 12 that are mounted through the furnace wall 28 and the graphite muffle 31. Although not shown in the graphite muffle 33, since a hole through which the furnace atmosphere gas passes is formed, the furnace atmosphere gas can be supplied into the heat treatment chamber 32 through this hole.

  Since the atmospheric gas in the furnace is supplied to the box 39 in a pressurized state, the atmospheric gas in the furnace supplied into the furnace is separated from the gap between the bush 40 and the heater 12 or the transport roller 19 and The roller support shaft 37 is prevented from leaking out from a gap or the like of the part attached to the graphite muffle 31 and the furnace wall 28.

  Although not shown, a carbon floor plate (carbon floor plate) is disposed at the bottom of the water-cooled cooling chamber 13, and the water-cooled cooling chamber 13 also improves quality by reducing the oxygen concentration. Yes.

(Function)
The operation of the continuous furnace 1 for brazing aluminum products having the above configuration will be described below. When the motors 23, 24, and 25 rotate, the roller support shaft 37 moves through the motor sprocket 48, the chain 47, the driven sprocket 46, the rotational drive shaft 44, the driving sprocket 45, the chain 47, and the driven sprocket 43. Rotate. Then, the interlocking sprocket 42 fixed to the roller support shaft 37 rotates to rotate the plurality of roller support shafts 37 and the transport roller 19 of the transport roller groups 20, 21, and 22 via a chain (not shown).

  In-furnace atmospheric gas such as nitrogen is fed into the box 39 and the slow chamber 8 from the supply pipe 50. The furnace atmosphere gas sent into the box 39 is supplied into the muffle 31 outside the graphite through the gap between the bush 40 and the heater 12. At the same time, the atmosphere gas in the furnace together with the introduced gas supplied from the slow cooling chamber fills the muffle 33 in the graphite to reduce oxidation in the heating chamber 7 and is sent into the water cooling cooling chamber 13 and exhausted from the outlet door 17. Is done. The atmosphere gas in the furnace sent from the supply pipe 50 is exhausted also from the heating chamber inlet 6 to the outside.

  When the aluminum product 11 to be heat-treated is mounted on the roller hearth 5 from the heating chamber inlet 6, it is heated at about 600 ° C. while being carried into the heating chamber 7 and conveyed forward. Further, the slow cooling chamber 8 passes through the water cooling cooling chamber 13, is cooled to about 300 ° C., and is carried into the air cooling cooling chamber 14. And it takes out from the air-cooling cooling chamber exit 16.

  In this continuous brazing furnace 1 for brazing aluminum products, conveying roller groups 20, 21, 22 are provided corresponding to the heating zone 2 and the cooling zone 3, respectively, and driven independently by separate motors 23, 24, 25. Therefore, the conveyance speeds of the conveyance roller groups 20, 21, and 22 can be appropriately adjusted according to the necessary processing time in each zone.

  In the continuous furnace 1 for brazing aluminum products, the conveying roller 19 extends outward through the support hole 36 of the side wall 35 of the graphite muffle 31. Even if the inside of the chamber 7 is heated to about 600 ° C., the thermal expansion coefficient of the graphite muffle 31 is small. Therefore, due to thermal expansion, the support hole 36 of the graphite muffle 31 through which the transport roller 19 passes does not deform or change its position. For this reason, the transport roller 19 and its roller support shaft 37 are not damaged, and smooth rotation is guaranteed.

  The best mode for carrying out the continuous furnace for brazing aluminum products according to the present invention has been described based on the embodiments. However, the present invention is not limited to such embodiments, and the claims It goes without saying that there are various embodiments within the scope of the technical matters described in the above.

  Although the present invention has been described above, the continuous furnace for brazing aluminum products according to the present invention is capable of transporting the continuous furnace by appropriately adjusting the speed with a plurality of transport roller groups. Although applied to brazing, it is also applicable to continuous furnaces for various metal heat treatments, such as continuous furnaces for carburizing, annealing and sintering metals, and continuous furnaces for brazing.

The whole structure of the continuous furnace for brazing of the aluminum product which concerns on this invention is shown. The whole structure of the Example of the continuous furnace for brazing of the aluminum product which concerns on this invention is shown. (A) shows AA sectional drawing of FIG. 2, (b) is a principal part enlarged view.

Explanation of symbols

1,51 Continuous furnace for brazing aluminum products
2 Heating zone
3 Water cooling zone
4 Air cooling zone
5 Laura Hearth
6 Heating room entrance
7 Heating chamber
8 Slow cooling room
9 Entrance door
10 Partition frame
11 Aluminum products to be brazed
12 Heater
13 Water cooling room
14 Air cooling room
15 Forced cooling blower
16 Air cooling cooling room exit
17 Exit door
18 Water cooling cooling room exit
19, 19 'transport roller
20, 21, 22 Transport roller group
23, 24, 25 Motor
26 Interlocking mechanism
27 Drive mechanism
28 Furnace wall
29 Metal outer wall
30 Insulation wall inside the outer wall
31 Muffle outside graphite
32 Heat treatment chamber
33 Muffle in graphite
34 Bush
35 Side walls on both sides of graphite muffle
36 Support hole formed in side wall
37, 37 'Roller support shaft
38 Metal plate
39 boxes
40 bush
41 Bearing
42 Sprocket for interlocking
43 Driven sprocket
44 Rotary drive shaft
45 Drive sprocket
46 Driven Sprocket
47 chain
48 Motor sprocket
49 Support frame
50 Furnace atmosphere gas supply pipe
52 Heating furnace 53 Water-cooled cooling chamber 54 Air-cooled cooling chamber 55, 56, 57 Roller hearth 58, 59, 60 Motor

Claims (4)

A continuous furnace for brazing aluminum products comprising a heating zone, a water cooling zone, an air cooling zone and a roller hearth,
The heating zone and the water cooling / cooling zone have a heating chamber and a water cooling / cooling zone having a carbon muffle and a carbon floor plate in the furnace wall and the water cooling wall,
The roller hearth includes a plurality of conveyance roller groups in which a plurality of conveyance rollers are arranged in parallel in the conveyance direction, and is configured to be independently driven by a motor for each conveyance roller group,
The conveying roller has both ends extending through the support holes formed in the side wall and the water cooling wall of the carbon muffle, and is concentrically fixed to the roller support shaft.
A continuous furnace for brazing aluminum products, wherein the roller support shaft is rotatably supported on the outer surfaces of the furnace wall and the water cooling wall via a bearing. A continuous furnace for brazing aluminum products comprising a heating zone, a water cooling zone, an air cooling zone and a roller hearth,
The heating zone has a heating chamber that is provided with a carbon muffle in the furnace wall and is supplied with atmospheric gas in the furnace, and has boxes sealed on both sides of the furnace wall,
The water-cooled cooling zone has a carbon floor plate in a water-cooled wall, the air-cooled cooling zone has a cooling chamber cooled by a blower, and has sealed boxes on both sides of the wall,
The roller hearth includes a plurality of conveyance roller groups in which a plurality of conveyance rollers are arranged in parallel in the conveyance direction, and is configured to be independently driven by a motor for each conveyance roller group,
The conveying roller has both ends extending through the support holes formed in the carbon muffle and the side wall of the water cooling wall and the wall of the air cooling cooling chamber, and is concentrically fixed to the roller support shaft.
The roller support shaft extends through the furnace wall, water cooling wall and air cooling wall into the box and into the box, and is rotatably supported on the outer surface of the furnace wall via a bearing. A continuous furnace for brazing aluminum products, characterized in that an interlocking mechanism is provided in conjunction with a plurality of other rollers constituting a transport roller group to which a transport roller supported by the roller support shaft belongs in the box.   The continuous furnace for brazing aluminum products according to claim 2, wherein the furnace atmosphere gas is supplied into the box.   The drive mechanism driven with a motor is provided in the edge part of the roller support shaft which supports one of the several roller which comprises the said conveyance roller group in the said box or, 3. A continuous furnace for brazing aluminum products according to item 3.

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