JPH0336879Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a tunnel furnace in which the effective height inside the furnace can be changed in accordance with the operation plan of the tunnel furnace.

(Prior art) Traditionally, tunnel furnaces have been constructed as solid structures made of bricks, monolithic refractories, etc.
It was also customary to use them for long periods of time without modification.

Therefore, when planning to build a tunnel furnace, predict the future height of the product to be fired and the production volume of the product to be fired, and choose the tunnel furnace with the effective height within the furnace that is most suitable for producing the product. It will be designed. However, conventional tunnel furnaces are built to be robust and can withstand many years of operation, and even if the product height or production volume changes during that time, the tunnel furnace must be rebuilt again and again in response to those changes. I can't go. For this reason, the production volume in tunnel furnaces has to be adjusted by loading empty saggers between the products to be fired, or by extending or shortening the firing time, but each has a limit, and even if it can be operated. However, fuel was wasted, and it was impossible to fire products that were too high to be accommodated in the tunnel furnace.

Furthermore, if the height of the fired product and the height of the tunnel furnace do not match, there is a problem that the temperature distribution and atmosphere within the furnace are unbalanced, resulting in a decrease in product quality such as strength and color tone.

In addition, partial repair of the ceiling structure and side walls, where soot-like substances tend to adhere, or if a product collapses inside the furnace, the furnace must be dismantled for repair, resulting in a long period of shutdown of the furnace. I had to.

(Problems to be solved by the invention) The tunnel furnace of the invention, which can change the effective height inside the furnace, eliminates the above-mentioned drawbacks and can withstand long-term operation, while adjusting the production volume of the tunnel furnace. In addition to making it possible to easily change the effective height inside the furnace, it also improves the quality of the fired products by adjusting the height to match the height of the fired products. The purpose of the present invention is to provide a tunnel furnace that can quickly remove the damaged truck when it becomes unable to move due to the collapse of the product to be fired.

(Structure of the invention) (Means for solving the problem) The tunnel furnace of the present invention, in which the effective height inside the furnace can be changed, has an outer shell that consists of a ceiling structure, a furnace body on both sides, and side walls. This is a tunnel furnace constructed of The essential configuration is that the height can be adjusted, and side wall members prepared in advance with heights of 8, 4, 2, and 1 are combined as appropriate and inserted and removed to form the side wall. This is a tunnel furnace whose height can be changed. Although the height of the individual side wall members does not have to be an integral multiple of the unit height, in order to improve compatibility between multiple tunnel furnaces, the height of the side wall members is in the ratio of 8, 4, 2, 1. Prepare in advance,
1, 2, 1+2, 2+2, 4, 1+2+2, 4+
1, 2+4, 2+2+2, 1+2+4, 8, 4+
It is convenient to configure the desired height using various combinations such as 4, 8+1, 4+4+1, 8+2, etc. Although the number of joints and side wall members increases, in order to reduce the number of types of side wall members, they may be combined with a height of at least one unit, and the heights used are limited to two or three types in advance. If the height is expected to increase, for example, you can create one with a height of 1 unit and another with a height of 1.5 units, and then exchange them in response to a request to change the effective height inside the furnace. Good too.

Unlike conventional tunnel furnaces, heavy materials such as bricks and monolithic refractories are not used as much as possible, and the tunnel furnace of the present invention, which allows the effective height inside the furnace to be changed, has fire resistance and heat insulation properties. It is best to construct it using good ceramic fiber as the main material.

When using ceramic fiber as the main material, side wall members prepared in advance with different heights are placed in a refractory metal box and secured with ceramic pins, and when using castable refractory as the main material, metal A metal anchor bolt may be welded or screwed to the bottom of the box, and castable refractory is poured into the box and hardened.
Further, a combustion burner hole is provided in the side wall member in a portion where the combustion burner is provided.

When the side wall portion is configured to be able to be inserted and removed by appropriately combining side wall members with different heights prepared in advance,
Connect the metal boxes of each side wall member with bolts or the like. Additionally, a fireproof packing or the like is inserted between each side wall member to prevent gas leakage and heat leakage.

(Function) The tunnel furnace of the present invention, in which the effective height inside the furnace can be changed, consists of the outer shell of the tunnel furnace consisting of a ceiling structure, the furnace body on both sides, and side walls, and the ceiling structure can be moved using a hanging device. However, it is essential to make it possible to adjust the effective height inside the furnace by appropriately combining side wall members prepared in advance and having different heights, inserting and removing them into this side wall portion, and reconfiguring the side wall. Height is 8,
Since the side wall part is constructed by inserting and removing the side wall members in proportions of 4, 2, and 1 as appropriate, when it becomes necessary to change the height of the product to be fired or the production volume, the operation of the tunnel furnace can be temporarily stopped. The ceiling structure is moved or removed using a hanging device, the side wall members are stacked to the desired height, the ceiling structure is mounted again, and the operation is started. In this way, the effective height within the furnace can be adjusted.

Furthermore, since the ceiling structure can be removed, if an accident such as product collapse occurs during operation of the tunnel furnace, it is possible to remove the ceiling structure and quickly restore the furnace, thereby significantly shortening the period of outage.

(Example) Example Furnace length: 40 m, width inside the furnace: 1500 mm, product loading height, i.e. effective height inside the furnace: 450 mm, ceiling structure made of lightweight castable refractory material, length 150 mm Tunnel In the furnace, height 300 as a side wall member
mm, length 1500mm, thickness 300mm and height 600mm
mm, length 1500 mm, and thickness 300 mm, and by using these side wall members at the same time, it was possible to freely assemble two types of furnaces, one with an effective furnace height of 450 mm and one with an effective height of 750 mm. At this time, it took two days to reassemble the furnace.

(Effects of the invention) The tunnel furnace of the present invention, in which the effective height inside the furnace can be changed, consists of the outer shell of the tunnel furnace consisting of a ceiling structure, the furnace body on both sides, and side walls, and the ceiling structure is connected to a hanging device. The essential configuration is to make it possible to adjust the effective height inside the furnace by appropriately combining side wall members prepared in advance with different heights and inserting and removing them into this side wall section to reconfigure the furnace. The height is 8,4,
Since the tunnel furnace is made of a combination of side wall members with a ratio of 2.1 and can be inserted and removed to change the effective height inside the furnace that constitutes the side wall, it is different from the conventional tunnel furnace, which has a sturdy structure that does not allow for disassembly. However, when it becomes necessary to change the height of the product to be fired or the production volume,
It is possible to temporarily stop the operation of the tunnel furnace, remove the ceiling structure, combine side wall members prepared in advance with different heights, stack the side wall members to the desired height, and then place the ceiling structure again and start operation. It is possible and
Moreover, if side wall members of various heights are prepared,
It does not take much time to replace it, and if you select the unit height of this side wall member, you can obtain a height that is a multiple of that, so by doing this, you can quickly increase the effective height inside the furnace. This has the effect of being able to adjust the volume of the furnace, which shortens the period of production stoppage, and also allows the furnace volume to be adjusted to match the production volume according to the production plan, improving the quality of fired products. In addition, it saves energy, and in the event of an accident caused by a product collapsing, the ceiling structure can be removed and the problem can be dealt with quickly.This invention has the potential to contribute to the development of industry and is of great value. There is something.

[Brief explanation of the drawing]

The figure is a partially cutaway assembled longitudinal sectional view showing an embodiment of the present invention. 1: Ceiling structure part, 2: Side wall member, 3: Hanging tool,
4: Furnace body, 5: Fireproof packing, 6: Anchor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A tunnel furnace in which the outer shell of the tunnel furnace is composed of a ceiling structure, a furnace main body on both sides, and side walls, wherein the ceiling structure is moved by a hanging device, and the side walls The effective height inside the furnace can be adjusted by appropriately combining side wall members prepared in advance and having different heights, inserting and removing them, and reconfiguring the furnace. tunnel furnace. (2) The effective height in the furnace as set forth in claim 1 of the utility model registration claim, in which side wall members prepared in advance with heights of 8, 4, 2, and 1 are appropriately combined and inserted and removed to form the side wall portion. A tunnel furnace that allows you to change the temperature.