JPH0642877A - Beam kiln - Google Patents

Abstract

PURPOSE:To obtain a beam kiln in which a temperature distribution therein is satisfactorily held, a heavily loaded material to be burned can be rapidly burned with high quality and automation of a burning operation is facilitated. CONSTITUTION:A beam kiln 10 has an upper body 12 and a lower body 14. The body 12 is suspended to be held in a predetermined height from a body installation surface by a horizontal fixing member 28 and a vertical fixing member 30. A gap 16 extended in a longitudinal direction of the kiln is formed between the bodies 12 and 14, and a plurality of beam units 20 having predetermined number of beams 18 are inserted into the gap 16. A burner 22 for heating the material to be burned is provided at predetermined positions of the bodies 12, 14. The material to be burned placed on the unit 20 at an inlet is moved longitudinally together with the unit 20 by conveying rollers 54, and fed to an outlet without zigzag.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam kiln for transporting a product to be fired by a large number of beams moving in a furnace body in a furnace length direction.

[0002]

2. Description of the Related Art Conventionally, tunnel kilns, electric pusher furnaces, etc. have been used as industrial kilns for firing ceramic raw materials and ceramic products. For example, a tunnel kiln is used to load products to be baked on a trolley that has a baking shelf and convey the products to be baked into a tunnel-shaped furnace body, and an electric pusher furnace is a multi-stage casket. The product to be fired loaded in is fired by pushing it into an electric furnace with a pusher or the like.

On the other hand, there is known a roller hearth kiln in which a large 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 to tunnel kilns and electric pusher furnaces, roller hearth kilns do not use kiln tools with a relatively large heat capacity, such as baking carts and saggers, so quick baking is possible, excellent furnace temperature control, and production line It has the advantage that it can be easily automated. Therefore, in recent years, in the kiln industry, there are many cases where the kiln equipment is switched from a tunnel furnace or an electric pusher furnace to a roller hearth kiln.

[0004]

However, according to such a roller hearth kiln, since the strength of the roller for conveying the product to be fired is comparatively small, the roller is broken when the product to be fired with a large load is fired. Easy to operate and the reliability of the furnace operation is low. For this reason, it is difficult to fire a heavy load to be fired using a roller hearth kiln, and a relatively long firing time is required.

Further, when an error in the outer diameter occurs in each roller of the roller hearth kiln, the product to be fired is likely 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 cross the device accurately. The present invention has been made to solve such a problem, and it is possible to maintain a good temperature distribution in a furnace, to burn a heavy load of products to be baked quickly with good quality, and to automate the baking. The purpose is to provide a beam kiln that is easy to implement.

[0006]

A beam kiln according to the present invention for solving the above-mentioned problems includes a lower furnace body having a lower side wall, an upper furnace body having an upper side wall and an upper wall, the lower side wall and the upper side wall. Fixing means for supporting the upper furnace body so as to form a gap in the furnace length direction, and a plurality of members inserted through the gap in the furnace width direction and arranged at predetermined intervals in the furnace length direction. Beam, a supporting member for supporting both ends of the beam, and a moving means for moving the supporting member in the furnace length direction.

[0007]

According to the beam kiln of the present invention, the product to be fired is conveyed by the high-strength beam moving in the longitudinal direction of the furnace body during firing. Therefore, the product to be fired, which has a relatively large load, is fired with good quality in a short time. Further, since the high temperature gas flows through the gaps between the beams, the temperature distribution in the furnace is maintained relatively well. 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 recovered at an appropriate position at the furnace outlet without meandering in the furnace.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a beam kiln according to a first embodiment of the present invention.
It shows in FIG. As shown in FIG. 1, the beam kiln 10 is
Upper furnace body 12 made of refractory brick, ceramic fiber, etc.
And the 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 inlet moves in the furnace length direction together with the plurality of beam units 20 continuous in the furnace length direction and reaches the furnace outlet. The burners 22 for heating the product to be fired are provided at predetermined positions in 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.
It consists of 6. The upper side wall 24 facing in the furnace width direction extends from the horizontally held upper wall 26 downward in the height direction with substantially the same length. Horizontal fixing members 28 are fixed to the top surface of the upper wall 26 at predetermined intervals in the furnace length direction, and vertical fixing members 30 that support the load of the upper furnace body 12 are fixed to both ends of the horizontal fixing member 28. It That is, the upper furnace body 12 is hung 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 so 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 outer side of the lower end of the lower side wall 32.

As shown in FIGS. 2 and 3, the beam unit 20 is made of SiC, Si-SiC, or the like 8-10.
The rectangular pipe-shaped beam 18 of about this number, two sealing members 38 made of ceramic fiber or the like, and two support pipes 40 made of heat-resistant steel or the like. The spacing between the seal members 38 is approximately equal to the furnace width, and the spacing between the support pipes 40 is
It is set larger than the furnace width. The plurality of beams 18 arranged at predetermined intervals in the furnace length direction are inserted into the through holes 38a of the sealing member 38, and both ends of the beam 18 are formed in a U-shape on the top surface of the support pipe 40. 42 is fitted. The beams 18 are horizontally arranged such that the surfaces formed by the top surfaces of the beams 18 are on the same plane.
The thermal expansion of the beam 18 causes the beam 18 to move to the concave surface of the guide 42.
The bottom surface and the side surface of both ends of the are allowed to slide. Further, when inspecting or replacing the beam 18, 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 wall thickness of the beam 18 is set to a predetermined thickness of about 5 mm to 10 mm so as to sufficiently withstand the load of the product to be fired. Here, the shape of the beam 18 is a square pipe shape in order to increase the limit load of the product to be baked that can be loaded on the beam unit 20 and to stably mount the product to be baked on the beam 18. Is.

The seal member 38 having a T-shaped cross section is constituted by connecting block bodies 44 shown in FIGS. 4 to 6 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 is placed. A frame body 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 which is relatively easily deformed. Further, a step portion 38b extends in the longitudinal direction of the seal member 38, and the step portion 3b
8b is formed so as to have a level difference with the step portions 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. As a result, the gap 1
When the beam unit 20 is arranged in FIG. 6, radiant heat inside the furnace, which enters a slight gap between the upper side wall 24 and the lower side wall 32 and the seal member 38, is radiated to the outside of the furnace body by being blocked by the step 38b. To prevent the sealing member 3
8, the sealing effect is enhanced.

An auxiliary member 50 is horizontally extended from the predetermined height position of the vertical fixing member 30 to the side of the lower side wall 32, and a rail 52 is fixed so as to be orthogonal to the auxiliary member 50.
The rails 52 are provided with transport rollers 54 that transport the beam unit 20 at predetermined intervals. 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 in the gap 16. Further, as shown in FIGS. 7 and 8, 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 this frame 56. Auxiliary roller 5
8 prevents the support pipe 40 from shifting in the furnace width direction when the beam unit 20 is conveyed.

During firing, the first beam unit 2 at the furnace entrance
Place the product to be fired at 0 and push it into the furnace with 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, the article to be fired is placed in the second beam unit 20,
Following the first beam unit 20, it is pushed into the furnace body.
Then, the first beam unit 20 is pushed by the second beam unit 20 and further advances into the furnace body. Similarly, the third beam unit 20 following the second beam unit 20 is also loaded into the furnace body so as to press the beam unit 20 that is inserted closest to the furnace inlet side. In addition,
In order to prevent the product to be fired from falling, a base plate (not shown) may be placed on the beam 18, and the product to be fired may be placed on the base plate.

The beam unit 20 that has passed through the furnace body is
As in the case of a normal tunnel kiln or roller hearth kiln, a return circuit for loading and unloading products is provided 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 having a relatively large heat capacity is not required to convey the product to be fired, the firing temperature of the product to be fired can be easily controlled and rapid firing is possible. is there. Further, since the high temperature gas in the furnace can easily pass through the gap between the adjacent beams 18 and flow in the upper and lower parts of the furnace, the temperature distribution in the furnace such as the pre-tropical zone and the firing zone is well maintained and the firing is performed. The quality of the product is improved.

When comparing the beam kiln 10 of the first embodiment with the roller hearth kiln, the beam kiln 10
Since the product to be fired is conveyed by the high-intensity beam 18, the limit value of the load is larger than that of the roller hearth kiln. Therefore, it is possible to quickly and quickly burn a product to be fired, which has a relatively large load. Also, beam kiln 1
No. 0 has less vibration than the roller hearth kiln and can stably convey the product to be fired. Furthermore, when the beam kiln 10 is used, the length of the furnace can be relatively shortened, so that the fuel, electric power, etc. required for firing can be greatly saved.

With respect to the beam kiln according to the first embodiment, the results of a comparison of the furnace performances of the tunnel kiln, the electrically heated pusher furnace and the roller hearth skin are shown in Table 1.

[0019]

[Table 1]

As shown in Table 1, the beam kiln of the first embodiment is superior to the tunnel kiln and the electric heating type pusher furnace in firing time, temperature distribution and fuel consumption, and is also compared with the roller hearth kiln. If so, the limit value of the load capacity is significantly improved. Next, the second aspect of the present invention
An embodiment will be described with reference to FIG.

In the beam kiln 60 according to the second embodiment, a lower horizontal fixing member 28 made of H steel or the like is provided at the lower end of the lower furnace body 14 and extends outward in the width direction of the furnace. The fixing member 30 is fixed. A jack bolt 64 is provided at an intermediate position in the longitudinal direction of the lower horizontal fixing member 62. Jack bolt 64
The position of is a position where the loads of the upper furnace body 12 and the lower furnace body 14 are evenly supported. With respect to the other components, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

According to the beam kiln 60 of the second embodiment, since the upper furnace body 12 and the lower furnace body 14 are both supported by the jack bolts 64, it is difficult for local stress to act on the lower horizontal fixing member 62 and the furnace body. The structure is stable. In addition, even if a difference in thermal expansion occurs between the upper furnace body 12 and the lower furnace body 14 during firing, it is difficult to increase or decrease the distance between the upper furnace body 12 and the lower furnace body 14,
The beam unit 20 can be transported smoothly.

A beam 18 kiln according to a third embodiment of the present invention is shown in FIG. Beam kiln 70 according to the third embodiment
The upper furnace body 12 and the lower furnace body 14 are fixed by a fixing member 72 having a predetermined inclination angle. One end of the fixing member 72 is fixed to the lower end of the lower side wall 32, and the other end is fixed to a relatively low position of the upper side wall 24. An auxiliary member 74 is fixed between the lower end of the vertical portion 72a of the fixing member and the lower side wall 32.

According to the beam kiln 70 of the third embodiment,
Since the fixing member 72 is relatively small, the space around the furnace body can be effectively used. In the first to third embodiments, the beam unit is driven by an external device such as a pusher, but in the present invention, the drive unit is provided on the transport roller to transport the beam unit. Good. Further, in order to increase the firing efficiency per predetermined furnace length, the beam unit may be of an upper and lower two-stage type.

[0025]

As described above, according to the beam kiln of the present invention, since the beam movable in the furnace length direction is provided in the furnace body and the article to be fired is conveyed by this beam, the temperature inside the furnace body is increased. There is an effect that good control can be performed and the firing time can be shortened, and an article to be fired, which has a relatively large load, can be fired uniformly and with high quality. Also, since the product to be fired is placed on the beam, it does not meander in the furnace and is stably transported from the furnace inlet to the furnace outlet, making it easy to put kilns in and out of the kiln. Has the effect of

[Brief description of drawings]

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

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

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

FIG. 4 is a side view showing a block body that constitutes the seal member of the first embodiment of the present invention.

5 is a view on arrow A in FIG.

6 is a view in the direction of arrow B shown in FIG.

FIG. 7 is a side view showing a conveying roller according to the first embodiment of the present invention.

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

FIG. 9 is a cross-sectional view showing a beam kiln according to a second embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a beam kiln according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 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 conveying roller ( transportation)

Claims (1)

[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 so that a gap is formed between the lower side wall and the upper side wall in the furnace length direction. Fixing means for supporting the furnace body, a plurality of beams inserted through the gap in the furnace width direction and arranged at predetermined intervals in the furnace length direction, and support members for supporting both ends of the beam, A beam kiln, comprising: a moving member that moves a support member in a furnace length direction.