JP3148440B2 - 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. In order to solve such a problem, the applicant of the present invention disclosed in Japanese Patent Application No. 4-198097 discloses a method in which a furnace temperature distribution is kept good, and a heavy product to be fired can be fired quickly with good quality. Also disclosed is a beam kiln that facilitates automation of firing.

However, according to this beam kiln, the driving unit for transporting the beam unit is easily heated by the high-temperature gas in the furnace or radiant heat blown out of the beam through hole in the kiln. There is a problem that the driving part such as the bearing is easily deteriorated or damaged. The present invention has been made to solve such a problem, and an object of the present invention is to provide a beam kiln that promotes cooling of a driving unit that conveys a beam.

A beam kiln according to the present invention for solving the above-mentioned problems 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 between the lower side wall and the upper side wall. Fixing means for supporting the upper furnace body so that a gap is formed in the direction, a plurality of cylindrical beams inserted through the gap in the furnace width direction and arranged at predetermined intervals in the furnace length direction, The cylindrical beam has a hole through which the upper part
A sealing member for sealing between a side wall and the lower side wall;
Formed by the upper furnace body, the lower furnace body, and the seal member
To be baked on the beam
Space and at least one end of the beam
Thermal insulation made of inserted ceramic fiber
And a support member that supports both ends of the beam, and a transport roller that supports the support member and transports the support member in the furnace length direction.

[0008]

It is desirable that the support member in the above invention is a tube having a length in the furnace length direction which is disposed so as to extend in the furnace length direction.

[0010]

According to the beam kiln of the present invention, the object to be fired is conveyed by a high-intensity beam moving in the longitudinal direction of the furnace during firing. Therefore, the article to be fired having a relatively large load is fired in a short time with good quality. In addition, since the high-temperature gas flows in the gap between the beams, the temperature distribution in the furnace is relatively well maintained. Further, since the beam itself moves in the furnace length direction, the article to be fired placed on the beam at the furnace inlet is reliably collected at an appropriate position at the furnace outlet without meandering in the furnace.

According to the beam kiln of the present invention, since the heat insulating material is provided at the end of the beam, the amount of heat transmitted from the beam to the transport roller via the support member is reduced. As a result, the heating of the parts such as the bearings of the transport roller is reduced. Therefore, deterioration or breakage of driving parts such as bearings is prevented, and the beam unit can be properly transported.

[0012]

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. As shown in FIG. 2, 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.

As shown in FIGS. 3 and 4, 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.

As shown in FIG. 1, both ends 1 of the beam 18 are
8a, 18b (only one end 18a is shown in FIG. 1,
The inside of the other end 18b is not shown) is filled with a ceramic fiber 100 as a heat insulating material. The ceramic fiber 100 has an excellent heat insulating function, and is inserted into a region only a predetermined length from the beam end.

The sealing member 38 having a T-shaped cross section is constituted by connecting block bodies 44 shown in FIGS. 5 to 7 in the furnace length direction, for example, and a gap 1 between the upper furnace body 12 and the lower furnace body 14.
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. As shown in FIGS. 8 and 9, a U-shaped frame 56 is fixed at a predetermined position of the rail 52, and an auxiliary roller 58 is provided at the tip of the frame 56. Auxiliary roller 5
8 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 16. Next, an article to be fired is arranged in the second beam unit 20,
Following the first beam unit 20, it is pushed into the furnace.
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 addition,
A base plate (not shown) may be placed on the beam 18 to prevent the article to be fired from falling, and the article to be fired may be arranged on the 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 and returned to the entrance side of the beam kiln 10. The temperature distribution around the end of the beam 18 is as shown in the graph in the lower part of FIG.
As can be understood from FIG.
Although the temperature is quite high at ℃, the temperature decreases remarkably from the boundary between the inside of the furnace and the furnace body toward the furnace body. The temperature is about 350 ° C. near the side plate 102 which is a boundary area between the furnace body and the outside of the furnace. The temperature gradually decreases from the side plate 102 toward the outside of the furnace. The dotted line A shown outside the furnace indicates the temperature distribution of the comparative example. In this comparative example, a state where the heat insulating material 100 is not provided at the end of the beam 18 is shown, and the above-described embodiment of the present invention is indicated by a solid line B.

As can be understood from the temperature distribution outside the furnace shown in FIG. 1, at the end of the beam 18, the temperature of the above embodiment of the present invention is lowered to a temperature closer to normal temperature than that of the comparative example. . As a result, the amount of heat transmitted to the conveying roller 54 and the bearing 200 via the support pipe 40 decreases, and the temperature of the bearing 200 decreases due to the temperature drop of the bearing 200.
Has improved durability, thermal degradation is reduced, and thermal damage is prevented.

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 for conveying the object to be fired, the firing temperature of the object to be fired is easy to control, and rapid firing is possible. Is possible. In addition, 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 in the furnace such as the pre-tropical zone and the sintering zone can be well maintained and the sintering can be performed. Product quality is improved.

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. Furthermore, if the beam kiln 10 is used, the furnace length can be relatively shortened, so that the fuel, electric power, and the like required for firing can be significantly saved.

Next, a second embodiment of the present invention is shown in FIG. The beam kiln 104 of the second embodiment shown in FIG.
A heat insulating material 106 is provided on the upper surface of a support pipe 40 that supports one end 18a, 18b (18b not shown) of the beam 18.
Is arranged. The heat insulating material 106 is preferably, for example, a ceramic fiber cloth such as asbestos cloth,
According to the present invention, the configuration of the heat insulating material 106 is not limited to the asbestos cloth, and a metal plate or a ceramic plate having lower heat conductivity than the beam material can be used.

The other components of the beam kiln 104 of the second embodiment are denoted by the same reference numerals as those of FIG. 1 and the description thereof is omitted. According to the beam kiln 104 of the second embodiment, the heat of the beam 18 exposed to the high temperature inside the furnace is either radiated to the outside of the furnace along the beam 18 or the heat insulating material 1 from the end 18 a of the beam 18.
06, via the support pipe 40, and the transport roller 54, are transmitted to the bearing 200, or are radiated to the surrounding air on the way. At this time, the end 18 of the beam 18
Since the amount of heat transmitted from the beam 18 to the support pipe 40 is reduced by the heat insulating material 106 provided between the support pipe 40 and the support pipe 40, the temperature rise of the support pipe 40 is reduced. The amount of heat transfer to 200 is reduced. Therefore, heating of the bearing 200 and the like is prevented, and deterioration, thermal damage, and the like of the bearing 200 are prevented.

It is a matter of course that the second embodiment and the first embodiment can be combined to use the heat insulating material 106 and the heat insulating material 100 together. In the first and second embodiments, the beam unit is driven by an external device such as a pusher. However, in the present invention, a driving device is provided on the transport roller 54 to transport the beam unit. You may. Further, in order to increase the firing efficiency per a predetermined furnace length, the beam unit may be of a two-stage type.

According to the beam kiln of the above embodiment, a beam is provided which is movable in the furnace length direction in the furnace and the product to be fired is conveyed by this beam. In addition to shortening, it is possible to sinter a product having a relatively large load with uniformity and high quality. Also, since the object to be fired is placed on the beam,
Since the article to be fired is stably transported from the furnace inlet to the furnace outlet without meandering in the furnace, kiln loading and unloading operations can be performed easily.

[0029]

As described above, according to the beam kiln of the present invention, the amount of heat transfer is reduced by the heat insulating material while the heat in the kiln is transferred from the beam to the transport roller via the support member. Therefore, the amount of heat transfer to the drive unit of the transport roller is reduced, so that the durability of the transport roller drive unit is improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a temperature distribution around an end of a beam kiln according to a first embodiment of the present invention and a temperature distribution around the end.

FIG. 2 is a partial 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 the beam unit according to the first embodiment of the present invention.

FIG. 5 is a side view showing a block body constituting the seal member of the first embodiment of the present invention.

FIG. 6 is a view in the direction of arrow A shown in FIG. 4;

FIG. 7 is a view in the direction of arrow B shown in FIG. 5;

FIG. 8 is a side view showing a transport roller according to the first embodiment of the present invention.

FIG. 9 is a front view showing a transport roller according to the first embodiment of the present invention.

FIG. 10 is a cross-sectional view showing the periphery of an end of a beam according to a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 beam kiln 12 upper furnace body 14 lower furnace body 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 40 support pipe (supporting means) 54 transport roller 100 Insulation 106 Insulation

Claims (2)

(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 the furnace body, a plurality of cylindrical beams inserted through the gap in the furnace width direction and arranged at predetermined intervals in the furnace length direction, and a hole through which the cylindrical beam penetrates. , The upper side wall and front
A seal member for sealing between the lower side wall and the upper furnace body, the lower furnace body, and the seal member;
To be baked on the beam
Space and at least one end of said beam inserted thereinto
A heat insulating material made of ceramic fiber, a support member for supporting both ends of the beam, and a transport roller for supporting the support member and transporting the support member in a furnace length direction. Beam kiln to do. 2. The beam kiln according to claim 1, wherein the support member is a tube disposed so as to extend in a furnace length direction.