JP3310429B2 - Beam kiln - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam kiln in which articles to be fired are conveyed by a number of beams moving in a furnace in a furnace length direction.

[0002]

2. Description of the Related Art Conventionally, industrial kilns for firing ceramic raw materials and ceramic products include a tunnel kiln and an electric pusher furnace. For example, a tunnel kiln is one in which articles to be fired are loaded on a truck having firing shelves and fired while transporting the articles to be fired in a tunnel-shaped furnace, and an electric pusher furnace is a multistage sagger. The object to be fired loaded into the furnace is pushed into the electric furnace with a pusher or the like and fired.

On the other hand, there is known a roller hearth kiln in which a number of rollers are arranged side by side in the conveying direction of the article to be fired, and the article is fired while being transported by the rollers.
Compared with tunnel kilns and electric pusher furnaces, roller hearth kilns do not use kiln tools with relatively large heat capacity, such as firing carts and saggers, so they can be fired quickly and have excellent furnace temperature control and production. It has the advantage that it is easy to automate lines. For this reason, in recent years, the kiln industry has often switched kiln equipment from a tunnel furnace or an electric pusher furnace to a roller hearth kiln.

[0004]

However, according to the roller hearth kiln, since the strength of the roller for conveying the object to be fired is relatively low, the roller breaks when firing the object to be fired under a large load. And the reliability of furnace operation is low. For this reason, it is difficult for a heavy load to be fired to be fired using a roller hearth kiln, and a relatively long firing time is required.

[0005] When an error in the outer diameter of each roller of the roller hearth kiln occurs, the product to be fired tends to meander from the furnace inlet to the furnace outlet, colliding with the side wall, and receiving at the furnace outlet. There was a problem that it did not accurately reach the device. Therefore, the present applicant has proposed a beam kiln for solving the above-mentioned problem, as disclosed in Japanese Patent Application No. 4-198,097. The purpose of this beam kiln is to maintain a good temperature distribution in the furnace, to make it possible to quickly and swiftly stack a plurality of products to be fired with good quality, and to easily carry out automation of the firing.

In this beam kiln, fixing means supports the upper furnace body so that a gap is formed between the lower side wall and the upper side wall, and a sealing member is provided to prevent heat and gas in the furnace from leaking from the gap. The beam is exposed outside the furnace through the sealing member. However, in the beam kiln having such a structure, the upper furnace body is supported by the fixing means, and it is necessary to adjust a gap formed between the upper furnace body and the lower furnace body, and the upper furnace body is required to be fixed. There is a problem that the structure of the fixing means for supporting the weight becomes large. Further, the lower side wall, the upper side wall, and the seal member may thermally expand due to heat in the furnace, and a gap may be formed at a contact portion between the members. Also, there may be a case where a contact portion between the beam and the contact member has a gap due to thermal expansion. For this reason, the degree of sealing in the furnace is low, and it cannot be said that heat and gas in the furnace are sufficiently shut off. Also, to dissipate heat to the outside through the beam,
This deteriorated the working environment outside the furnace and caused a decrease in thermal efficiency. Further, when it is necessary to adjust the gas atmosphere in the furnace and perform firing, a large-scale seal structure is required to cope with the atmosphere leak from the inside of the furnace.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a beam kiln having a simple structure in which a member is prevented from being exposed to and protruded from the outside of a furnace. Another object of the present invention is to easily seal the space between the lower side wall and the upper side wall, maintain a good temperature distribution in the furnace, and make it possible to quickly and sinter a heavy product to be fired with good quality. An object of the present invention is to provide a beam kiln that can easily adjust the inside atmosphere.

[0008]

According to the present invention, there is provided a beam kiln having a lower furnace body having a lower side wall, an upper furnace body having an upper side wall and an upper wall, and supported by the lower furnace body. Supporting means for supporting the upper furnace body such that a gap is formed in the furnace length direction between the lower side wall and the upper side wall; A plurality of beams, both ends of which are located at predetermined intervals in the furnace length direction; a support member that supports both ends of the beam in the gap; and a movement that moves the support member in the furnace length direction in the gap. Means.

[0009]

According to the beam kiln of the present invention, members and means for supporting and moving the beam are provided in the furnace wall,
Since the upper furnace body is supported by the support means supported by the lower furnace body, the members are prevented from being exposed to and protruding from the outside of the furnace, and the structure of the furnace is simplified.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a beam kiln according to a first embodiment of the present invention.
As shown in FIG. FIG. 2 shows the overall configuration of the beam kiln. As shown in FIG. 2, the beam kiln 10 includes a lower furnace body 11 and an upper furnace body 1 made of firebrick, ceramic fiber, and the like.
2 A gap 100 and a space 200 extending in the furnace length direction are formed between the lower furnace body 11 and the upper furnace body 12, and a plurality of beam units 20 having a predetermined number of beams 18 are inserted into the gap 100. . The article to be fired placed on the plurality of beam units 20 at the furnace entrance moves in the furnace length direction together with the plurality of beam units 20 connected in the furnace length direction, and reaches the furnace outlet. Burner 22 for heating the article to be fired
Are provided at predetermined positions of the lower furnace body 11 and the upper furnace body 12 at predetermined intervals in the furnace length direction.

The lower furnace body 11 includes a lower side wall 24 and a floor wall 2.
6 and the opposed lower side walls 24 extend in the furnace length direction at a constant interval. The lower side wall 24 is provided with a step portion 24a into which a seal member 38 described later can be inserted, and a concave portion 24b is formed following the step portion 24a. The outer wall of the lower side wall 24 is covered with the casing member 16.

The upper furnace body 12 includes an upper side wall 32 and an upper wall 3.
4 and is supported by the lower steel body 11 and supported by H steels 13 arranged at predetermined intervals in the furnace length direction. The upper side wall 32 is provided with a step 32a into which a seal member 38 described later can be inserted. Following the step 32a, a supporting steel pipe 15 for holding the upper furnace body 12 supported by the H steel 13 is arranged on the outer wall side. A rectangular groove 32b is formed in the furnace length direction. The upper side wall 32 opposed in the furnace width direction extends approximately the same length upward in the height direction, and continues to the upper wall 34 held horizontally. The outer wall of the upper side wall 32 is
It is covered with a casing member 16. In the present embodiment, the upper furnace body 12 is supported by using the H steel 13, but in the present invention, as long as the upper furnace body can be supported, it is also possible to use steel or pipe.

The H steel 13 supports the upper furnace body 12 so that a predetermined gap 10 is provided between the lower furnace body 11 and the upper furnace body 12.
0 and a space portion 200 are obtained, and the gap 100 and the space portion 200 are covered by a cover seal 17 fixed to the casing member 16, so that heat and atmosphere gas in the furnace escape to the outside of the furnace. Is preventing.
The size of the gap 100 and the space 200 can be adjusted by replacing the H steel 13.

As shown in FIG.
On the outer wall side of 4b, a supporting steel pipe 14 is installed in the furnace length direction,
The supporting steel pipe 15 is fitted in the rectangular groove 32b of the upper side wall 32. A support plate 50 having one end in the furnace width direction fixed to the lower side wall 24 is placed on the support steel pipe 14 in the furnace length direction. The H steel 13 is placed on the support steel pipe 14 via the support plate 50, and supports the upper furnace body 12 via the support steel pipe 15.

A fixing plate 51 is supported on a portion of the supporting plate 50 where the H steel 13 is not mounted, and a rail 52 for conveying the beam unit is fixed to the fixing plate 51 in the furnace length direction. The rail 52 is provided with rollers 54 for transporting the beam unit 20 at predetermined intervals, and a gap 100 from the furnace entrance.
The support pipe 40 of the beam unit 20 inserted in the roller 54 is supported by the roller 54. In this embodiment,
Although the roller unit and the rail 52 are used as the beam unit transport means, in the present invention, it is possible to use a carriage system or a chain rail as the transport means.

As shown in FIG. 3, the beam unit 20
Is a beam 18 made of a ceramic material such as recrystallized SiC or Si-SiC or heat-resistant steel, two seal members 38 made of ceramic fiber or heat-resistant material, and two support pipes 40 made of heat-resistant steel or the like. Consists of The space between the seal members 38 is substantially equal to the width of the inner wall of the furnace, and the space between the support pipes 40 is set smaller than the width of the outer wall of the furnace. A plurality of beams 18 arranged at predetermined intervals in the furnace length direction are inserted into through holes 38 a of a sealing member 38, and both ends of the beams 18 are formed in a U-shape on a top surface of a support pipe 40. 42. Each beam 18 is horizontally arranged such that the surfaces formed by the top surfaces of these beams 18 are on the same plane. The thermal expansion of the beam 18 is allowed by sliding the bottom and side surfaces of both ends of the beam 18 against the concave surface of the guide 42. When the beam 18 is to be inspected or replaced, if the cover seal 17 is removed, the beam 18 can be easily pulled out from the side of the furnace body. In this embodiment, a beam 18 having a square pipe shape is used, which is desirable in terms of strength and mounting of the article to be fired. However, in the present invention, various shapes can be used.
Also, the number of beams can be set arbitrarily according to the purpose.

The sealing member 38 having a T-shaped cross section is formed by connecting blocks made of a fire-resistant material and the like in the furnace length direction, and is disposed in a gap 100 between the lower furnace body 11 and the upper furnace body 12. You. Outside the seal member 38 in the width direction, the shape of the seal member 38 that is relatively easily deformable is maintained.
A U-shaped frame 46 shown in FIG. 3 is provided. Also,
A step portion 38b extends in the longitudinal direction of the seal member 38. The step portion 38b is formed at the upper end of the lower side wall 24 and the lower end of the upper side wall 32 shown in FIG.
It is formed so as to have the same level difference as a. Accordingly, when the beam unit 20 is disposed in the gap 100, the radiant heat in the furnace that enters a small gap between the lower side wall 24 and the upper side wall 32 and the seal member 38 is blocked by the step 38b and directly Because it is prevented from being released outside,
The sealing effect of the sealing member 38 is enhanced. Further, since the cover seal 17 covers the gap 100 and the space portion 200 in the furnace length direction, it prevents heat, gas, etc. in the furnace from escaping outside the furnace or air outside the furnace from entering the furnace. Atmosphere can be kept constant.

The transport roller 54 is freely rotatable in the direction in which the beam unit 20 moves. Transport roller 5
The height of 4 is adjusted so that the sealing member 38 is fitted into the gap 100. As shown in FIG. 4, a U-shaped frame 56 is fixed at a predetermined position of the rail 52, and an auxiliary roller 58 is provided at the leading end of the frame 56. The auxiliary roller 58 prevents the support pipe 40 from shifting in the furnace width direction when the beam unit 20 is transported.

During firing, the first beam unit 2 at the furnace entrance
The article to be fired is placed at 0 and pushed into the furnace by a pusher or the like. At this time, when the support pipe 40 is placed on the transport roller 54, the seal member 38 is inserted into the gap 100.
Next, the article to be fired is placed in the second beam unit 20 and pushed into the furnace following the first beam unit 20. Then, the first beam unit 20 is pushed by the second beam unit 20 and further proceeds inside the furnace body.
Similarly, the third beam unit 20 subsequent to the second beam unit 20 is carried into the furnace so as to press the beam unit 20 inserted closest to the furnace entrance. In order to prevent the article to be fired from falling, a base plate (not shown) may be placed on the beam 18 and the article to be fired may be arranged on this base plate.

The beam unit 20 that has passed through the furnace is:
As in the case of a normal tunnel kiln or roller hearth kiln, a return circuit for loading and unloading products is provided so as to return to the entrance side of the beam kiln 10. According to the beam kiln 10 of the first embodiment, since a kiln tool such as a shelf material having a relatively large heat capacity is not required to transport the article to be fired, the firing temperature of the article to be fired is easy to control, and rapid firing is possible. is there. Further, since the high-temperature gas in the furnace can easily flow up and down in the furnace by passing through the gap between the adjacent beams 18, the temperature distribution and atmosphere in the furnace such as pre-tropical zone and sintering zone can be well maintained. The quality of the fired product is improved.

In the beam kiln 10 of the first embodiment, members such as the support pipe 40 for supporting and transporting the beam 18, the rail 52, and the transport roller 54 are provided in the space 200, and the H for supporting the upper furnace body 12. Since the steel 13 is also installed in the space 200, the member is prevented from being exposed and protruding outside the furnace, and the structure is simplified. Therefore, the gap 100 and the space 2 are covered by the cover seal 17.
00 can be easily sealed, not only preventing the heat from being dissipated to the outside but also controlling the atmosphere such as gas components, temperature and pressure in the furnace. Due to the small wall thickness of the lower side wall 24 and the upper side wall 32 of the beam kiln 10,
When a member such as the support pipe 40 becomes hot, the space 20
By introducing air from outside the furnace into the inside of the furnace, the members such as the support pipe 40 can be cooled and kept at a constant temperature. Conversely, it is possible to improve the fuel efficiency by sucking the atmospheric gas from the space in the high temperature section and blowing it into the preheating section.

When comparing the beam kiln 10 of the first embodiment with a roller hearth kiln, the beam kiln 10
Since the object to be fired is transported by the high-strength beam 18, the limit value of the load is larger than that of the roller hearth kiln. For this reason, the article to be fired having a relatively large load can be fired quickly and with high quality. Also, beam kiln 1
In the case of 0, the article to be fired can be stably conveyed with less vibration than the roller hearth kiln. Further, since the heat dissipated in the furnace can be prevented by the seal member 38 and the cover seal 17, it is possible to greatly save energy such as fuel and electric power required for firing.

Next, a second embodiment of the present invention will be described with reference to FIG. The same reference numerals are given to basically the same configuration as the first embodiment. In the second embodiment, instead of the H steel 13 supporting the upper furnace body 12 of the first embodiment, the upper furnace body is fixed to the outer wall of the lower side wall 71 and the upper side wall 72 by columns 62 fixed at regular intervals. Support from. The support column 62 uses, for example, a highly rigid H steel, an angle, or the like to support the upper furnace body. The space between the columns 62 is covered with a cover seal (not shown).

In the second embodiment, the columns 62 are fixed to the outer walls of the lower side wall 71 and the upper side wall 72. However, in the present invention, the columns can be embedded in the side walls. As a result, the cover seal covers the gap and the space of the beam kiln, so that the heat and atmosphere in the furnace can be well maintained. In the second embodiment, the pillars 62 are provided on the outer walls of the lower side wall 71 and the upper side wall 72 instead of the H steel 13 of the first embodiment.
Is fixed to support the upper furnace body, so that the wall thickness of the lower side wall 71 and the upper side wall 72 can be reduced.

[0025]

As described above, according to the beam kiln of the present invention, the members and means for supporting and transporting the beam are provided within the width of the side wall of the beam kiln, and the supporting means supported by the lower side wall is provided by the upper furnace. By supporting the body, the number of members exposed and protruding outside the furnace is reduced, so that the structure of the furnace is simplified, work around the furnace is facilitated, the furnace can be easily sealed, and the atmosphere can be adjusted.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a beam kiln according to a first embodiment of the present invention.

FIG. 2 is a perspective view illustrating a beam kiln according to a first embodiment of the present invention.

FIG. 3 is a perspective view showing a beam unit according to the first embodiment of the present invention.

FIG. 4 is a front view showing a transport roller according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a beam kiln according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Beam kiln 11 Lower furnace body 12 Upper furnace body 13 H steel (supporting means) 18 Beam 24 Lower side wall 26 Floor wall 32 Upper side wall 34 Upper wall 40 Supporting pipe (supporting means) 54 Transport roller (moving means) 100 Gap 200 Space (gap)

Claims (2)

(57) [Claims] A lower furnace body having a lower side wall; an upper furnace body having an upper side wall and an upper wall; and a furnace length direction supported between the lower furnace body and the lower side wall and the upper side wall. Support means for supporting the upper furnace body so that a gap is formed in the furnace; and a plurality of support means being inserted into the gap in the furnace width direction and having both ends located in the gap and arranged at predetermined intervals in the furnace length direction. A beam kiln comprising: a beam; a support member that supports both ends of the beam in the gap; and a moving unit that moves the support member in a furnace length direction in the gap. 2. The lower side wall and the lower side wall so as to cover the gap.
And attached to the outer wall of the upper side wall in the furnace length direction
2. The cover according to claim 1, further comprising a cover seal.
Beam kiln.