KR101968000B1 - Reduction Device and Method - Google Patents

Abstract

It is possible to realize fine vibration in the conveyed product and additionally enable the introduction of the bottom-side reducing gas so as to increase the gas contact area of the product to be heat-treated, thereby ultimately improving the reduction efficiency, A reduction device and a method for preventing the above-mentioned problems are provided.
According to the present invention, there is provided a reduction device comprising: a device body for providing a reduction space for heat treatment and reduction of a product; a conveyance belt for conveying a product mounted while passing through the device body; And conveyance belt support means provided between the apparatus body portion and the conveyance belt for enabling air gap formation in at least a product to be heat-treated and reduced.

Description

{Reduction Device and Method}

The present invention relates to a reduction apparatus and a method for heat-treating and reducing a product such as an oxidized powder, and more particularly, to a method and apparatus for improving the reduction ratio by increasing a gas contact area (contact property) of a product such as a powder subjected to heat treatment and reduction, The present invention relates to a reduction apparatus and a method for preventing wear and noise from occurring.

A known reducing apparatus (reducing furnace) based on a reducing atmosphere using a gas such as hydrogen or carbon monoxide is shown in FIG.

For example, as shown in FIG. 1, the conventional reduction apparatus 1 basically includes a muffle section 10, and the muffle section 10 is provided with a reduction furnace 10 for a product heat treatment such as powder, A main muffle 12 forming a tunnel-like space forming the inside of the vehicle, and a floor muffle 14 provided with a conveyor belt (steel belt) serving as a conveying means. The main muffle 12 is mainly made of STS material. Such a muffle portion 10 may be manufactured by welding 16 in the longitudinal direction or the width direction due to limitations of materials in a practical commercial environment.

The bottom muffle 14 is provided with a transporting means for continuously transporting a product to be heat-treated such as the oxidizing powder 30 or the like, for example, a high-temperature transporting belt, that is, a mesh belt 50, Although illustrated schematically in the drawings, such conveyance belts can be operated in an endless track form based on drive and driven sprockets or the like.

However, since the plate belt is simple to install, it has been repeatedly required to expand and contract at a high temperature (in the longitudinal direction), and it has been troublesome to replace the plate belt after a certain period of time. On the other hand, in the case of the mesh belt, the width of occurrence of shrinkage or expansion at high temperature is not so large, the part is easily replaced, and the service life is increased. Such a mesh belt is provided in a multi-layered structure having a very dense and meshed meshing structure, so that there is no problem in transferring powder or the like.

However, in the case of the conventional reducing apparatus 1 of Fig. 1, since the mesh belt 50 is transported in an endless track in a state in which the mesh belt 50 continuously contacts (the bottom surface of) the bottom muffle 14 of the muffle portion 10, Friction between the belt and the bottom surface (bottom surface) of the floor muffle 14 is continuously generated, so that the mesh muffler 50 as well as the bottom muffle 14 are also severely worn.

Particularly, such continuous contact between the mesh belt 50 and the bottom muffle 14 of the conventional reduction apparatus 1 has a serious problem that the overall apparatus continuously generates excessive noise.

On the other hand, Japanese Patent Laid-Open Publication No. 2013-214664 A (Oct. 17, 2013) also discloses a technique for heat treating a pressure-sensitive core on the basis of the mesh belt 31 in the heat treatment furnace 2. In this case, Since the mesh belt 31 is continuously transported in contact with the steel strip 30 in the same manner as in the first embodiment, it includes the problems of wear of the mesh belt described above and considerable noise generation.

Therefore, the friction between the mesh belt and the bottom muffle prevents wear and excessive noise of the belt, and in particular, microvibration through sagging of the conveyance belt is realized, thereby enabling formation of voids in the heat treated and reduced product, A technology for increasing the reduction rate is required.

Japanese Laid-Open Patent Application No. 2013-214664 A (Oct. 17, 2013)

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-mentioned problems, and it is an object of the present invention to provide an apparatus and a method for forming a gap in a product during heat treatment and reduction, And a method of reducing the wear and noise of the conveyance belt while increasing the reduction efficiency ultimately.

According to an aspect of the present invention, there is provided a reduction device comprising: a device body part providing a reduction space for heat treatment and reduction of a product; A conveyance belt for conveying a product to be conveyed; And conveyance belt support means provided between the apparatus body portion and the conveyance belt to enable formation of a gap in at least a product to be heat-treated and reduced, wherein the conveyance belt support means Voids are formed in the product to be subjected to the heat treatment reduction by the fine vibration of the conveyance belt, and the interval is adjusted so that the conveyance belt support means adjusts the gap formation in the product.
According to another aspect of the present invention, there is provided a reducing apparatus comprising: a device body for providing a reduction space for heat treatment and reduction of a product; a conveying device for conveying a product to be heat- belt; And conveyance belt support means provided between the apparatus body portion and the conveyance belt to enable formation of a gap in at least a product to be heat-reduced and reduced, wherein the conveyance belt support means comprises a muffle portion constituting the apparatus body portion At least one of or both of a ball means and a leaf spring means provided on the bottom muffle in the traveling direction of the conveyance belt, wherein the ball means includes a base provided on the floor muffle and an idle ball or a slip ball provided therein The plate spring means includes a resilient plate spring body and a belt contact protrusion protruding from the plate spring body to contact the conveyance belt.

Further, the conveyance belt may be provided with a mesh belt, and a bottom-side reducing gas introducing means for introducing a reducing gas into the bottom space between the apparatus body portion formed by the conveyance belt supporting means and the conveyance belt .

Preferably, the product includes at least powder, and the apparatus body portion may be provided with a muffle portion including a main muffle forming the reduction space and a bottom muffle at the conveyance belt side.

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More preferably, the conveyance belt support means is arranged in the longitudinal direction of the conveyance belt, and the preceding and following support means are staggered from each other.

More preferably, the conveyance belt support means may be on a moving member moving along a rail member provided on a floor muffle constituting a muffle portion which is the apparatus body portion.

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More preferably, the leaf spring body of the leaf spring means is further provided with a bent fastening portion fitted to the moving member moving along the rail member provided on the bottom muffle.

According to another technical aspect of the present invention, there is provided a reducing method comprising: heat treating and reducing a product mounted on a conveyance belt passing through a muffle portion provided in the reducing apparatus, using the reducing apparatus; And a cavity forming step of forming a cavity in the product to be subjected to the heat treatment through a conveying belt supporting means provided on a floor muffle provided in the muffle portion and supporting a conveyance belt, Wherein the conveyance belt is provided as a mesh belt and a reducing gas is further injected into the bottom space between the bottom muffle and the mesh belt by the conveyance belt support means to increase the gas contact area of the powder.

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According to the present invention, it is possible to form a crevice in a product such as a powder by realizing a fine vibration through continuous deflection of the belt in a product conveying belt during heat treatment and reduction, thereby improving the gas contactability and further improving the reduction ratio .

In addition, by forming a space on the bottom side of the bottom muffle, it is possible to add additional reducing gas to the bottom side space, thereby increasing the gas contact area of products such as powder and providing another effect of further increasing the reduction rate.

Finally, friction between the conveyor belt and the bottom muffle that transports the product is eliminated, providing another effect that is inherently preventing belt wear and excessive noise generation.

1 is a front view showing a conventional reducing apparatus
2 is a front view showing the reducing apparatus according to the present invention
3 is a plan view showing a part of the reducing apparatus according to the present invention
FIG. 4 is a schematic view for explaining the formation of voids in the oxidized powder during the reduction in the heat treatment in the reducing apparatus according to the present invention
5 is a side view showing the introduction of the bottom muffle of the reducing gas in the reducing apparatus according to the present invention
Fig. 6 is a front view of Fig. 5
7 is a front view showing another embodiment of the reducing apparatus according to the present invention
FIG. 8 is a partially exploded perspective view of FIG.
Fig. 9 is a plan view showing another embodiment of the reducing apparatus according to the present invention
Fig. 10 is a plan view showing another modification of Fig. 9

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, preferred embodiments of the present invention will be described in detail.

2 and 3 show a reduction apparatus 100 according to the present invention.

For example, the reducing apparatus 100 according to the present invention may include an apparatus body unit for providing a reduction space A for processing the heat treatment and reduction of the product, and a transfer unit for transferring the product mounted while passing through the reduction space of the apparatus body unit A conveyance belt, and conveyance belt support means provided between the apparatus body and the conveyance belt to enable formation of voids in at least a heat-reduced product.

That is, in the reducing apparatus 100 of the present invention, the reducing atmosphere (space) formed by using the internal reducing space A of the apparatus body portion, that is, the supplied high-temperature reducing gas such as hydrogen or carbon monoxide, And the products mounted on the conveyance belt are successively heat-treated and reduced.

5, the reducing apparatus of the present invention can be divided into a heating stand H and a cooling stand (CO). In the reducing apparatus 100 of the present invention, The formation of voids ('C' in FIG. 4) may be implemented at least in the heating zone (H) section of FIG. Of course, the conveyor belt support means of the present invention can also be provided so that the conveyor belt, e.g., the mesh belt 150, rubs against the bottom of the cooling-stand body (not shown) to prevent wear and noise generation .

However, as shown in FIG. 2, the product applied to the reducing apparatus 100 of the present invention may be a powder to be heat-treated, for example, an oxidized powder 110.

In the following description of the present embodiment, the product will be described as the oxide powder 110.

However, as described in detail with reference to FIG. 4, the above-mentioned oxide powder 110 may be smooth as compared with other products. However, when the product does not necessarily form the oxide powder 110, But is not limited to.

2, the apparatus body portion of the reducing apparatus 100 of the present invention preferably includes a main muffle 132 forming a reducing space A (reducing atmosphere) And may be provided to a muffle portion 130 including a muffle 134.

In the following description of the present embodiment, the apparatus body portion of the present invention reducing apparatus will be described as a muffle portion 130, and if necessary, a main muffle 132 and a bottom muffle 134 will be described. Reference numeral 136 denotes a weld portion at the time of manufacturing the muffle.

As shown in FIGS. 2 and 3, in the present reducing apparatus 100, the conveyance belt may be provided by a mesh belt 150. Of course, the conveyance belt may be provided as a plate belt not shown, as described above.

At this time, the conveyance belts of the mesh belt and the plate belt may be steel belts that normally operate at least in a reducing atmosphere of high temperature. Although not shown in the drawing, the conveyance belt may be driven by an endless track Or the like.

The mesh belt 150 passes through the bottom muffle 134 to the bottom of the main muffle 132 as described above.

However, in the following description of this embodiment, the conveyance belt is described as the mesh belt 150. [

2 to 4, the reducing device 1 of the present invention is provided between the bottom muffle 134 of the muffle portion 130 and the mesh belt 150 on the upper side thereof, The conveyance belt support means for enabling the formation of the voids C in the oxidized powder 110 to be reduced is suitably arranged on the bottom muffle 134 of the muffle section 130 in the direction of travel of the mesh belt May be provided with a ball 170 provided.

For example, as shown in FIGS. 2 and 4, the ball unit 170, which is the conveyance belt supporting means, includes a base 172 mounted on the bottom muffle 134 in an appropriate pattern, Such as an idle ball 174 or a slip ball.

More preferably, as shown in FIG. 3, the ball unit 70 stably supports the mesh belt 150 by arranging the mesh belt 150 to be staggered in the longitudinal direction of the mesh belt 150 Structure.

Particularly, although no space is formed between the bottom muffle 14 and the mesh belt 50 in the conventional reduction apparatus 1 of FIG. 1, the ball unit 170 as the conveyance belt supporting means of the present invention The leaf spring means 180 described in detail in Figs. 9 and 10 enables the formation of a separate bottom side space B between the bottom muffle 134 and the mesh belt 150. Fig.

Therefore, when the oxidizing powder of the mesh belt 150 is transported in the reducing apparatus 1 of the present invention, the mesh belt 150 is transported to the bottom of the mesh belt 150 through the ball means 170 or the plate spring means 180, The conveyance is supported between the mesh belt 150 and the bottom surface of the bottom muffle 134 generated by the conventional reduction apparatus 1 of FIG. 1, Friction is eventually eliminated and wear of the mesh belt 150 or the floor muffle 134, which is expensive STS material, is prevented.

Moreover, since excessive noise generation, which is a larger problem in an actual operating environment, is also eliminated, the operating environment is also improved.

4, one of the main features of the reducing apparatus 100 of the present invention is that the mesh belt (not shown) is transported while being supported by the ball means 170, which is the conveyance belt support means, or the plate spring means 180, 150) is capable of forming a crevice in the oxidized powder 110 to be heat-treated and reduced.

For example, when the actual oxidation powder 110 is heat-treated and reduced, the conveying speed of the mesh belt 150 is set at a considerably low speed, for example, at a speed of 50 to 100 mm / min.

The mesh belt 150 having the fine meshes does not contact the bottom surface of the bottom muffle 134 but is supported and transported by the ball means 170 or the leaf spring means 180, The sagging of the mesh belt 150 occurs at the interval (section) X between the ball means 170 and the conveying belt holding means such as the plate spring means 180, The oxidized powder 110 which is heat-treated while being transferred in the deflected area Y of the belt may be bent (deformed) due to sagging of the mesh belt during the process of curing during reduction, and the voids C may be formed.

4 shows the state of the mesh belt 150 between the ball means 170. However, as shown in FIG. 3, the mesh belt 150 is continuously heated to a height of about 5-7 m (Y region) of the mesh belt 150 shown in FIG. 4 is repeatedly generated, and as a result, the mesh belt 150 The microvibrations are generated as a whole, and therefore the voids C of the oxidized powder 110 can be formed more smoothly.

As a result, if the void C is intentionally generated in the oxidized powder 110 subjected to the heat treatment and reduction as described above, the gas contact area (gas contact property) of the oxidized powder is reduced by contact with hydrogen or the like, which is a reducing gas, It contributes to improvement of the reduction ratio.

However, since the pores may affect the product quality when the final product is obtained immediately after the heat treatment and reduction, it is preferable that the reducing apparatus 100 (100) of the present invention is applied to the oxidized powder product which is subjected to post- , But it goes without saying that the present invention is not limited thereto.

3 and 4, the repeated deflection (Y region) of the mesh belt 150 between the ball means 170 and the leaf spring means 180 (FIG. 9) The interval X of the conveying belt supporting means, that is, the ball means 170 or the plate spring means 180, taking into account the components of the oxidized powder 110 to be heat-treated and the reducing conditions, ), It is possible to adjust the environment for forming the gap C in the oxidized powder 110 or make it smoother.

For example, as shown in FIG. 3, when the pair of preceding and following pairs of ball means 170 and plate spring means 180 are arranged in a unit arrangement, the interval X between these unit arrangements is adjusted, The sagging degree of the mesh belt 150, that is, the fine vibration width, can be adjusted, and of course, the sagging of the belt is not limited to the range in which the belt does not contact the bottom surface of the bottom muffle 134 in the bottom side space B to be.

Of course, as described above, the distance between the ball means and the plate spring means as the conveying belt supporting means is adjusted not only in the longitudinal direction of the mesh belt 150 but also in the width direction of the mesh belt 150, Belt deflection may occur. That is, the interval between the ball means and the plate spring means can be based on the longitudinal direction (traveling direction) of the mesh belt, but the widthwise spacing of the mesh belt can also be adjusted.

5 and 6, the conveying belt supporting means of the present invention reducing device 1 is supported by the bottom surface of the bottom muffle 134 (the bottom surface of the bottom muffle 134) Between the belt 150, a bottom space B which is not formed at all in the case of the reducing apparatus of the prior art shown in Fig. 1 can be formed.

Therefore, the reducing apparatus 1 of the present invention enables the addition of the reducing gas G to the bottom space B between the mesh belt 150 and the bottom muffle 134, Side reducing gas supply unit 210, which is difficult to use.

5, an atmospheric gas G 'such as hydrogen is supplied to the internal reducing space A of the main muffle 132 through the reducing gas input line 210' for heat treatment and reduction of the oxidized powder In addition, in the case of the present invention, another reducing gas (G) is further added to the bottom space B between the bottom muffle 134 and the mesh belt 150, which was impossible due to the contact between the conventional belt and the bottom muffle .

Therefore, the gas introduced into the bottom space B passes vertically through the mesh belt 150 and comes into contact with the bottom (bottom) portion of the oxidized powder 110, resulting in a great increase in the gas contact area of the oxidized powder .

For example, there are various process parameters in the reduction process of the oxidizing powder. However, the amount of hydrogen gas to be supplied and the flow rate as well as the contact area (probability) with the hydrogen gas affect the reduction ratio. Can be separately supplied to the lower part of the reduction device, the gas contact area of the oxidized powder can be increased.

That is, since the hydrogen gas is lighter than air, when the hydrogen gas is supplied to the upper part, the hydrogen gas can not be supplied to the bottom muffle side (lower part) The penetration depth of the hydrogen gas introduced into the lower part can be increased more than the upper part due to the property to move to the upper part so that the reduction is simultaneously performed to the upper part and the lower part, have.

Next, FIGS. 7 and 8 show another embodiment of the reducing apparatus 100 according to the present invention.

7 and 8, the ball means 170 and the leaf spring means 180, which are the conveyance belt supporting means, are disposed on the floor muffle 134 of the muffle portion 130, And can be provided on the movable member 200 moving along the rail member 190 provided along the rail member 190 to be positionally adjustable.

At this time, the rail member 190 is appropriately provided with fastening holes 194 that are plate-processed and fastened to the bottom muffle 134. The rail member 190 is inserted into the sliding plate as the moving member 200, And a guide groove 192 which is formed in the guide groove 192.

Therefore, the position of the movable member 200 can be easily adjusted while moving along the rail member 190. In this case, as described above, the gap X between the ball means, which is the conveyance belt supporting means in FIGS. 3 and 4, The adjustment will be facilitated and, in addition, the installation of the conveyance belt support means will be facilitated as a whole.

Of course, although not specifically shown in the drawings, the movable member 200 may be fixed by a bolt fastening or a stopping mechanism known to the rail member 190 or the like.

7 and 8, the moving plate 200, which is the moving plate 200, is appropriately positioned in the longitudinal direction by avoiding the portion where the ball means 170 and the leaf spring means 180 are mounted, Through holes 212 may be further formed.

7, when the reducing gas is supplied to the bottom space B, a separate reducing gas introducing means 210 is provided to pass through the gas passing holes 212 of the moving member 200, (150) and comes into contact with the oxidized powder (110).

Next, Figs. 9 and 10 show the plate spring means 180 which can be further applied to the ball means as the conveyance belt supporting means, as described above.

For example, the plate spring means 180 of the present invention is constructed such that a resilient plate spring body 182 and a massive belt 150, which is integrally protruded upwardly and transported upwardly, And a belt contact protruding portion 184 (of FIG.

Since the plate spring means 180 is self-resilient, it is possible to provide buffering force rather than the ball means 170 to smoothly form the fine vibration of the mesh belt 150, And a bolt fastening hole 182a can be provided in the lower portion of the plate spring body 182. [

In addition, as shown in Fig. 10, when the rail member 190 and the moving member 200 of Figs. 7 and 8 are used, the plate spring body 182 of the plate spring means 180 of the present invention is bent The fastening portions 186 of the leaf spring means 180 can be easily inserted at appropriate intervals along the moving plate 200 which is the moving member 200 during the actual construction so that the fastening portions 186 can be easily assembled Therefore, the movement of the leaf spring means 180 is facilitated, and the spacing of the leaf spring means 180 in the longitudinal direction of the movable member can be easily adjusted.

At this time, since the fastening portion 186 is fitted to the moving member 200 corresponding to the traveling direction of the mesh belt 150, the leaf spring means 180 is not separated from the moving member.

Next, the reducing method of the present invention will be summarized in addition to the reducing apparatus 100 of the present invention described so far.

For example, as shown in FIGS. 2 and 5, the reducing method of the present invention includes a transfer belt, for example, a mesh belt 150 passing through a muffle unit 130 of a reducing apparatus, And a conveying belt supporting means provided on the side of the bottom muffle 134 of the muffle portion for supporting the conveyance of the conveyance belt, for example, through a ball means 170 or a leaf spring means 180 And forming a gap in the oxidized powder 110 to be heat-treated and reduced.

Such a product, that is, the formation of voids (C) in the oxidized powder has been described in detail in FIG.

That is, in the reducing method of the present invention, the ball means 170 and the leaf spring means 180, which are the conveyance belt supporting means, are arranged in the traveling direction of the conveyance belt, To induce the formation of the voids C of the oxidized powder 110, thereby further increasing the reduction ratio.

Further, in the state where the conveying belt of the present invention is provided with a mesh belt, the distance between the bottom muffle 134 and the mesh belt 150 by the ball means 170 or the plate spring means 180, Further reducing gas (G) is further injected into the bottom space (B) formed in the bottom portion (B) of the bottom plate, thereby increasing the gas contact area of the oxidizing powder as described above.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present specification and drawings are intended to illustrate rather than limit the technical spirit of the present invention, and the scope of technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100 .... reduction device 110 .... product (powder)
130 .... device body part (muffle part) 132 .... main muffle
134 .... Bottom muffle 150 .... Transfer belt (mesh belt)
170 .... Ball means (conveying belt supporting means)
180 .... Plate spring means (conveying belt supporting means)
190 .... rail member 200 .... movable member
210 .... Reduction gas inlet means
A .... reduction space B .... floor space

Claims (13)

An apparatus body for providing a reduction space for heat treatment and reduction of the product; a conveyance belt for conveying the product to be heat treated and reduced while passing through the apparatus body portion; And conveyance belt support means provided between the apparatus body portion and the conveyance belt, the conveyance belt support means being capable of providing at least air formation in a product to be subjected to heat treatment reduction,
Wherein air gaps are formed in the product to be subjected to the heat treatment by micro vibration of the conveyance belt due to sagging of the conveyance belt between the conveyance belt support means and the interval between the conveyance belt supports is adjusted so as to adjust the gap formation in the product Reducing device to be adjusted.
An apparatus body for providing a reduction space for heat treatment and reduction of the product; a conveyance belt for conveying the product to be heat treated and reduced while passing through the apparatus body portion; And conveyance belt support means provided between the apparatus body portion and the conveyance belt, the conveyance belt support means being capable of providing at least air formation in a product to be subjected to heat treatment reduction,
Wherein the conveying belt holding means includes at least one or both of ball means and leaf spring means provided on the bottom muffle constituting the muffle portion which is the apparatus body portion in the traveling direction of the conveyance belt, Wherein the plate spring means includes a resilient plate spring body and a belt contact protrusion protruding from the plate spring body to contact the conveyance belt.
3. The method according to claim 1 or 2,
The conveyor belt is provided as a mesh belt,
A bottom-side reducing gas introducing means for introducing a reducing gas into the space on the bottom side between the apparatus body portion formed by the conveying belt supporting means and the conveying belt;
Further comprising:
3. The method according to claim 1 or 2,
Said product comprising at least powder,
Wherein the apparatus body portion is provided with a main muffle forming the reduction space and a muffle portion including a bottom muffle on the conveyance belt side.
The method according to claim 1,
Wherein the conveyance belt is prevented from being worn by the conveyance belt support means and from generating noise in the apparatus.
3. The method of claim 2,
A gap is formed in the product to be heat-reduced by the minute vibration of the conveyance belt due to deflection of the conveyance belt between the conveyance belt support means, and noise is generated in the device due to abrasion of the conveyance belt through the conveyance belt support means This prevents the reduction device.
The method according to claim 6,
Wherein said conveying belt support means are adjusted in spacing to adjust void formation in said product.
3. The method according to claim 1 or 2,
Wherein the conveyance belt support means is arranged in the longitudinal direction of the conveyance belt, wherein the preceding and following conveyance belt support means are staggered from each other.
3. The method according to claim 1 or 2,
Wherein the conveying belt holding means is provided on a moving member moving along a rail member provided on a floor muffle constituting a muffle portion which is the apparatus body portion.
The method according to claim 1,
Wherein the conveying belt holding means includes at least one or both of ball means and plate spring means provided on the bottom muffle constituting the muffle portion which is the apparatus body portion in the traveling direction of the conveyance belt.
11. The method of claim 10,
Said ball means comprising a base provided in a bottom muffle and an idle ball or slip ball provided therein,
Wherein the plate spring means comprises a resilient plate spring body and a belt contact protrusion protruding from the plate spring body to contact the conveyance belt.
The method according to claim 2 or 11,
Wherein the leaf spring body of the leaf spring means is further provided with a bent fastening portion to be fitted in the moving member moving along the rail member provided on the bottom muffle.
Using the reducing apparatus described in claim 3,
Heat-treating the product mounted on the conveyance belt passing through the muffle portion provided in the reduction device; And an air gap forming step of forming a gap in the product to be subjected to the heat treatment through a conveying belt supporting means provided on a floor muffle provided in the muffle portion and supporting the conveyance of the conveyance belt,
The product is provided with at least powder, the conveyance belt is provided with a mesh belt, and further a reducing gas is further introduced into the bottom space between the bottom muffle and the mesh belt by the conveyance belt support means, .

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