JP3148439B2 - 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 conveyed 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, have excellent furnace temperature control, and have a good production line. It has the advantage that it is easy to implement automation. 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 large number of products to be fired with good quality, and to easily carry out automation of firing.

In this beam kiln, the gap is filled with a seal member so that heat and gas in the furnace do not leak from the gap formed between the lower side wall and the upper side wall, and the beam passes through the seal member and goes out of the furnace. It is exposed. However, in such a structure, 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, when the lower furnace body and the upper furnace body are composed of multiple kiln units, even if the kiln units are joined when the furnace is installed, the lower furnace body or the upper furnace body thermally expands as it is used. In some cases, a gap may be formed at the joint by repeating heat shrinkage and the like. For this reason, the degree of sealing in the furnace is low, and it cannot be said that heat, gas, and the like in the furnace are sufficiently blocked.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to maintain a constant temperature and atmosphere in a furnace without leaking heat or gas inside the furnace outside the furnace. And

[0008]

A beam kiln according to the present invention comprises 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 between the lower side wall and the upper side wall. Fixing means for supporting the upper furnace body so that a gap is formed, sealing means for shutting off the inside and outside of the furnace, and inserted through the gap and arranged at predetermined intervals in the furnace length direction It is characterized by comprising a plurality of beams, a support member for supporting both ends of the beam outside the furnace of the sealing means, and a moving means for moving the support member in the furnace length direction.

[0009]

[0010]

According to the beam kiln of the present invention, since the heat, gas and the like in the furnace hardly leak out of the furnace, the temperature and the gas atmosphere in the furnace are kept uniform.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 10 show a beam kiln according to one embodiment of the present invention. As shown in FIG. 1, the beam kiln 10
Upper furnace body 12 made of refractory brick, ceramic fiber, etc.
And a lower furnace body 14. A gap 16 extending in the furnace length direction is formed between the upper furnace body 12 and the lower furnace body 14, and a plurality of beam units 20 having a predetermined number of beams 18 are inserted into the gap 16. 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. The burners 22 for heating the products to be fired are provided at predetermined positions of the upper furnace body 12 and the lower furnace body 14 at predetermined intervals in the furnace length direction.

The upper furnace body 12 includes an upper side wall 24 and an upper wall 2.
Consists of six. The upper side wall 24 opposed in the furnace width direction extends from the upper wall 26 held horizontally to a substantially equal length downward in the height direction. A horizontal fixing member 28 is fixed to the top surface of the upper wall 26 at a predetermined interval in the furnace length direction, and a vertical fixing member 30 for supporting the load of the upper furnace body 12 is fixed to both ends of the horizontal fixing member 28. You. That is, the upper furnace body 12 is suspended and held at a predetermined height from the furnace body installation surface by the horizontal fixing member 28.

The lower furnace body 14 includes a lower side wall 32 and a floor wall 3.
4 and is provided below the upper furnace body 12 with the same furnace width and furnace length as the upper furnace body 12. The lower side wall 32 extends upward in the height direction such that a gap 16 having a predetermined width is obtained between the lower end of the upper side wall 24 and the upper end of the lower side wall 32. A jack bolt 36 for finely adjusting the height of the lower furnace body 14 is fixed to the outside of the lower end of the lower side wall 32.

The sealing member 62 is provided on the surface 38 of the sealing member 38.
and c in the furnace length direction. This seal body 62 is
The sealing member 38 and the upper side wall 24 are kept at a constant distance from the joint 91 with the surface 38c and the upper side wall 24.
And extends upward at an appropriate length so as to cover the contact portion 69. The seal body 61 is in contact with the upper side wall 24 in the furnace length direction. The seal body 61 is provided at the joint 9 with the upper side wall 24.
2 extends downward so as to cover the seal body 62. There is a recess 61 a between the seal body 61 and the upper side wall 24. The concave portion 61a is filled with a fibrous material 71 having high heat resistance such as ceramic as a sealing material.
Is buried in the fiber. The structure and positional relationship between the seal body 63 and the seal body 64 are the same as those of the seal body 61 described above.
And the seal body 62, but the seal body 63
Is filled with a heat-resistant fiber material 71 such as ceramic. In the present invention, instead of this fiber material, fine particles having high heat resistance such as sand may be filled in the concave portions. The distal end portion 64a of the seal body 64 is buried in the fibrous material 71 filled in the concave portion 63a of the seal body 63. In the present invention, sand may be used instead of the fiber material.

FIG. 3 shows a seal structure between the kiln units 14a of the lower furnace body.
d is sandwiched in a concave portion 64c of the rear end portion 64b of the seal body 64, and a fiber material 72 having high heat resistance such as ceramics is densely bonded to the concave portion 64c. The seal structure between the kiln units 12a of the upper furnace body by the seal body 62 is the same.

As shown in FIGS. 4 and 5, the beam unit 20 is made of SiC, Si--SiC or the like.
It is composed of about a square pipe-shaped beam 18, two seal members 38 made of ceramic fiber or the like, and two support pipes 40 made of heat-resistant steel or the like. The interval between the seal members 38 is substantially equal to the furnace width, and the interval between the support pipes 40 is
It is set larger than the furnace width. 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 causes the concave surface of the guide 42 to
Are allowed by sliding the bottom and side surfaces of both end portions of the. When the beam 18 is to be inspected or replaced, the beam 18 can be easily pulled out from the side of the furnace body.

The beam 18 is manufactured by extrusion molding or the like. The diameter of the beam 18 is, for example, 60 mm × 60 mm, and the thickness of the beam 18 is set to a predetermined thickness of about 5 mm to 10 mm so as to sufficiently bear the load of the article to be fired. Here, the shape of the beam 18 is made into a square pipe shape in order to increase the limit load of the firing target that can be loaded on the beam unit 20 and to stably mount the firing target on the beam 18. It is.

The sealing member 38 having a T-shaped cross section is constituted by connecting block bodies 44 shown in FIGS. 6 to 8 in the furnace length direction, for example, and a gap 1 between the upper furnace body 12 and the lower furnace body 14 is formed.
6. A frame 46 having a U-shaped cross section is provided on the outer side in the width direction of the seal member 38 so as to maintain the shape of the seal member 38 that is relatively easily deformed. A step 38b extends in the longitudinal direction of the seal member 38, and the step 3
8b are formed so as to have steps similar to the steps 24a and 32a formed at the lower end of the upper side wall 24 and the upper end of the lower side wall 32 shown in FIG. Thereby, the gap 1
When the beam unit 20 is disposed at 6, the radiant heat in the furnace that enters a small gap between the upper side wall 24 and the lower side wall 32 and the seal member 38 is blocked by the step portion 38b and directly discharged to the outside of the furnace body. Sealing member 3
8, the sealing effect is enhanced.

An auxiliary member 50 is horizontally passed from a predetermined height position of the vertical fixing member 30 to the lower side wall 32 side, and a rail 52 is fixed perpendicular to the auxiliary member 50.
A transport roller 54 that transports the beam unit 20 at predetermined intervals is provided on the rail 52. The transport roller 54 is freely rotatable in the moving direction of the beam unit 20. The height of the transport roller 54 is adjusted so that the seal member 38 is fitted into the gap 16. At a predetermined position of the rail 52, as shown in FIGS.
A U-shaped frame 56 is fixed, and an auxiliary roller 58 is provided at the leading end of the frame 56. The auxiliary roller 58 supports the support pipe 40 when the beam unit 20 is transported.
Is prevented from shifting in the furnace width direction.

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 16. Seal body 62 and seal body 6 joined to seal member 38
4 is in constant contact with ceramic fibers, sand, and the like in the concave portion 71 and advances together with the seal member 38. 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. The seal body 61 and the seal body 64 are also constantly in contact with ceramic fibers, sand, and the like, and advance. 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 present embodiment, the sealing member 38 and the lower side wall 3
2. The contact portion 69 between the seal member 38 and the upper side wall 24 is covered with the seal body 61, the seal body 62, the seal body 63, and the seal body 64. Further, ceramic fibers or sand is used as a sealing material in a fitting portion of each seal body. For this reason, even if the lower side wall 32, the upper side wall 24, or the seal member 38 expands and deforms to some extent due to the heat inside the furnace, the amount of heat, gas, and the like leaking out of the furnace is reduced. And the atmosphere in the furnace can be kept uniform. Further, even if there is a deformation, manufacturing or installation error due to thermal expansion in each seal body, the sealing material such as ceramic fiber or sand can absorb the error and satisfactorily shut off heat and gas in the furnace.

Since the high temperature gas in the furnace can easily flow up and down in the furnace through the gap between the adjacent beams 18,
The inside of a furnace such as a pre-tropical zone or a sintering zone can be favorably maintained at a desired temperature distribution. For this reason, there is little firing unevenness, and the quality of the article to be fired can be improved uniformly and with high quality. According to this beam kiln, since a kiln tool such as a shelf material having a relatively large heat capacity is not required for transporting the article to be fired, the firing temperature of the article to be fired is easily controlled, and rapid firing is possible.

[0023]

[0024]

[0025]

As described above, according to the beam kiln of the present invention, since the sealing means for shutting off the inside of the furnace and the outside of the furnace is provided, the amount of heat, gas, etc. in the furnace leaking out of the furnace is small.
Since the temperature in the furnace is hard to decrease and it is easy to keep the temperature constant, there is an effect that a product to be fired having a uniform quality with less firing unevenness can be manufactured.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a beam kiln according to one embodiment of the present invention.

2 is a transverse sectional view showing a Bimukirun according to an embodiment of the present invention.

FIG. 3 is a schematic sectional view taken along line III-III of FIG. 2;

Is a perspective view showing a beam unit according to an embodiment of the present invention; FIG.

FIG. 5 is a front view showing a beam unit according to one embodiment of the present invention.

FIG. 6 is a side view showing a block body constituting a seal member according to one embodiment of the present invention.

FIG. 7 is a view in the direction of arrow A shown in FIG. 6;

8 is a view as seen in the direction of arrow B shown in FIG. 7;

9 is a side view of a conveying roller according to an embodiment of the present invention.

It is a front view of a conveying roller according to an embodiment of the present invention; FIG.

[Explanation of symbols]

 Reference Signs List 10 beam kiln 12 upper furnace body 12a kiln unit 14 lower furnace body 14a kiln unit 16 gap 18 beam 24 upper side wall 26 upper wall 28 horizontal fixing member (fixing means) 30 vertical fixing member (fixing means) 32 lower side wall 38 sealing member (seal) Means) 40 Support pipe (support member) 54 Transport roller (moving means) 61 Seal body (sealing means) 62 Seal body (sealing means) 63 Seal body (sealing means) 64 Seal body (sealing means)

Claims (1)

(57) [Claims] 1. A lower furnace body having a lower side wall, an upper furnace body having an upper side wall and an upper wall, and the upper furnace body being formed in a furnace length direction between the lower side wall and the upper side wall. Fixing means for supporting a furnace body; sealing means for covering the gap in the furnace length direction; a plurality of beams inserted through the gap and arranged at predetermined intervals in the furnace length direction; A support member that supports both ends of the beam on the outside, and a moving unit that moves the support member in a furnace length direction, wherein the sealing unit is disposed in the gap in the furnace length direction, and
Insert both ends of multiple beams and move with the beams
Sealing member, and a furnace for the upper side wall and the lower side wall
It is attached to the outside in the furnace length direction, and is
A recess is formed between the upper side wall and the lower side wall.
Extending from the lower side wall to the lower side wall.
Forming a first seal extending toward the upper side wall
Body, a heat-resistant fiber material filled in each of the recesses,
The seal member is attached to the seal member in the furnace length direction, and the seal member
And the upper side wall and the lower side wall in a furnace length direction.
The upper side wall and the lower side so as to cover the formed gap.
Keep the upper side wall and the front
The tip extends toward the lower wall,
A beam kiln having a second seal body to be buried .