JPH0579766A - Roller hearth kiln - Google Patents

Abstract

PURPOSE:To obtain a roller hearth kiln which enables a reduction in the amount of heat dissipation from a furnace wall to improve the working environment around the furnace wall and to prevent equipment around the furnace wall from being heated to high-temperatures and getting out of order. CONSTITUTION:A number of rollers 16 are arranged in lines in a furnace 3 of a roller hearth kiln. A partition wall 24 is installed outside the furnace and along the length of the furnace, facing an upper side wall 12. The lower end of a vacant space between the upper side wall 12 and the partition wall 24 communicates with an outdoor air intake port 26 on a lower end 24b side of the partition wall 24, and the upper end of the vacant space 25 communicates with an exhaust port 27 on an upper end 24a side of the partition wall 24. The air inside the vacant space 25 is heated by the radiant heat generated from the furnace 3 and discharged upward of the furnace 3 through the exhaust port 27 by spontaneous convection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller hearth kiln for burning an article to be fired while it is being conveyed, and more particularly to a furnace wall structure of the roller hearth kiln.

[0002]

2. Description of the Related Art Conventionally, a roller hearth kiln for firing small and lightweight ceramic products such as tiles has a tunnel-shaped furnace body made of refractory bricks, ceramic fibers, etc. The furnace body is made of heat-resistant steel, for example. It is stored in the casing. The rollers that convey the product to be fired are arranged in parallel in the furnace length direction and are driven by a drive device provided outside the casing. The furnace wall of the roller hearth kiln comprises a furnace side wall and a casing side plate, and a through hole for inserting a roller is formed in the furnace wall in the furnace length direction.

[0003]

However, according to the conventional roller hearth kiln, when the temperature of the side wall of the furnace body becomes high during firing, the amount of heat radiated from the casing side plate and the through hole of the roller is relatively large. Becomes relatively hot. For example, when the temperature inside the furnace chamber is maintained at about 1100 to 1260 ° C, the temperature around the furnace wall may rise to about 150 to 160 ° C. For this reason, the work environment around the furnace wall is likely to be deteriorated, and it becomes difficult to quickly load and unload the products to be fired and quickly perform the inspection work of the rollers. Further, since the roller supporting portion and the like are heated to a relatively high temperature, there is a problem that equipment such as the roller driving device is likely to be damaged.

The present invention has been made in order to solve such a problem, and reduces the amount of heat radiation radiated from the furnace wall to improve the working environment around the furnace wall and to improve the work environment around the furnace wall. It is an object of the present invention to provide a roller hearth kiln that prevents a failure due to high temperature of equipment.

[0005]

A roller hearth kiln according to the present invention for solving the above-mentioned problems is a roller for firing a product to be fired by a number of rollers arranged in the furnace length direction on the floor of the furnace body. A hearth kiln, a partition wall provided outside the furnace body along the side wall of the furnace body, a cavity provided between the side wall of the furnace body and the partition wall, and an outside air inlet and an outside air communicating with the cavity part. And a discharge port.

[0006]

According to the roller hearth kiln of the present invention, the air in the cavity is heated as the temperature of the side wall of the furnace body rises.
On the other hand, the outside air taken in from the outside air inlet passes through the cavity and is discharged to the outside from the outside air outlet. Therefore, the radiant heat from the side wall of the furnace body is blocked by the partition wall, and the hot air around the side wall of the furnace body is discharged from the outside air outlet to the outside of the furnace body.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. A roller hearth kiln according to the first embodiment of the present invention is shown in FIGS. As shown in FIG. 2, the roller hearth kiln 1 has a tunnel-shaped furnace body 3 housed in a casing 2 made of heat-resistant steel or the like. Casing 2
Is composed of a frame member 4 arranged horizontally and vertically, side plates 5, a bottom plate 6 and a ceiling plate 7 welded to the frame member 4, and the furnace body 3 forming a furnace chamber 8 is made of ceramic fiber. It is composed of an upper side wall 12 and a ceiling wall 13 made of the same material, and a lower side wall 14 and a floor wall 15 made of refractory bricks. A roller through hole 9 penetrating in the furnace width direction is formed in the side plate 5 and the lower side wall 14 at a predetermined position in the furnace length direction, and a ceramic roller 16 that conveys a product to be fired is inserted into the roller through hole 9. ..

A drive device 18 for driving the roller 16 is arranged outside the casing 2. One end 16 of the roller 16
A drive unit 17 for rotating the roller 16 at a predetermined peripheral speed
And a driven portion 20 having a driven roller 19 at the other end 16b. The partition wall 2 made of stainless steel or the like is supported by the support pin 21 on the outside of the side plate 5 in the furnace width direction.
3, 24 are attached. Upper ends 23 of the partitions 23, 24
a and 24a are frame members 4 arranged on the top of the casing 2.
And the lower ends 23a and 24a are located at about the height of the drive unit 17 and the driven unit 20 of the drive device 18. The thickness of the partition walls 23 and 24 is set to about several mm. The distance D between the side plate 5 and the partition walls 23, 24 is a distance that allows ventilation in the cavity 25 formed between the side plate 5 and the partition wall 23, and is set to, for example, about 100 mm. The lower end of the hollow portion 25 communicates with the outside air introduction port 26 opened between the partition wall lower ends 23a, 24a and the side plate 5, and the upper end of the hollow portion 25 opens between the partition wall upper ends 23a, 24a and the side plate 5. It communicates with the outside air outlet 27. Lower end 23b of partition wall 23
3 is formed with a semi-elliptical notch 29 shown in FIG. 3 for inserting a drive shaft 28 fixed to one end of the roller 16.
In addition, a bent portion 30 that is bent so as to cover the driven portion 20 is formed at the lower end 24b of the partition wall 24.

As shown in FIG. 1, the bent portion 30 of the partition wall 24.
The rotary shaft 31 fixed to the partition wall 24 can be opened and closed outward in the furnace width direction as shown by an arrow c in FIG. Thus, for example, when the roller 16 is replaced, the end 16a of the roller 16 is removed from the drive unit 17, and then the bent portion 30 is opened as shown by the chain line in FIG. The roller 16 can be easily taken out.

At the time of firing, the air in the cavity 25 is heated by the radiant heat generated from the side plate 5 and the roller through hole 9. Then, the heated air rises due to natural convection,
As shown by an arrow a in FIG. 1, the air is discharged from the outside air outlet 27 to outside the furnace. Thereby, the radiant heat of the cavity 25 is discharged above the furnace body 3. Then, as shown by an arrow b in FIG. 1, when the outside air is introduced from the outside air introduction port 26 into the hollow portion 25, the hollow portion 25 has a relatively low temperature, and the roller driving device 1
8 and the side plate 5 are cooled.

According to the roller hearth kiln 1 according to the first embodiment, the partition wall 2 is formed by circulating air in the cavity 25.
3, 24 are kept relatively cool. Therefore, the partition 2
There is almost no radiant heat from 3, 24, the work environment around the furnace wall is kept at a relatively low temperature, and the work of loading and unloading the products to be fired,
The inspection work of the rollers can be performed relatively easily.

A roller hearth kiln according to a second embodiment of the present invention is shown in FIG. Laura Hearth Kiln 40 is a furnace 3
A cylindrical duct 42 is provided in the furnace length direction above the partition walls 23, 24 provided outside the furnace width direction. Duct 42
An outside air discharge port 45 communicating with the cavity 25 between the side plate 5 and the partition walls 23, 24 is formed at a predetermined position on the lower part of the peripheral surface of the. Radiant heat generated from the side plate 5 and the roller through hole 9 is collected from the hollow portion 25 to the duct 42 and guided to a chimney (not shown) or the like. The duct 42 may be provided with a blower fan or the like in order to improve air circulation through the cavity 25 and the duct 42.

Laura Hearth Kiln 40 according to the second embodiment
According to the above, since the radiant heat generated in the cavity 25 can be guided to an arbitrary place through the duct 42, it is possible to effectively use the radiant heat of the furnace body 3 by connecting the duct 42 to a heat exchanger, for example. it can.

[0014]

As described above, according to the roller hearth kiln of the present invention, the work environment around the furnace wall is improved by forming the furnace wall forming the furnace body into a double structure of the furnace body side wall and the partition wall. There is an effect that the reliability of the equipment can be improved by keeping the equipment at a relatively low temperature and preventing the equipment around the furnace wall from being heated.

[Brief description of drawings]

FIG. 1 is a schematic view showing a furnace wall of a roller hearth kiln according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a roller hearth kiln according to the first embodiment of the present invention.

FIG. 3 is a partial side view showing a partition wall on the driving unit side according to the first embodiment of the present invention.

FIG. 4 is a partial perspective view showing a roller hearth kiln according to a second embodiment of the present invention.

[Explanation of symbols]

 1 roller hearth kiln 3 furnace body 16 roller 12 upper side wall (furnace body side wall) 14 lower side wall (furnace body side wall) 23, 24 partition wall 25 cavity 26 outside air inlet 27 outside air outlet

Claims (1)

[Claims] 1. A roller hearth kiln for firing an article to be fired while transporting the article to be fired by a plurality of rollers arranged in the floor direction inside the furnace body in the furnace length direction, the roller hearth kiln being provided outside the furnace body along the side wall of the furnace body. A roller hearth kiln having a partition wall, a cavity provided between the furnace body side wall and the partition wall, and an outside air inlet and an outside air outlet communicating with the cavity.