JPH0563720B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a ceramic firing apparatus for firing a ceramic object to be fired inside a cylindrical furnace tube disposed in a furnace body.

(Prior art) Generally, when a ceramic object to be fired is heat-treated in a desired atmospheric gas, the object to be fired is housed in a furnace tube placed inside a furnace, and atmospheric gas is supplied to this furnace tube from the outside. Ceramics firing equipment is used to heat-treat objects to be fired.

Conventionally, in this type of ceramic firing apparatus, a furnace body 3a is constructed of fireproof and insulating bricks or the like inside a furnace frame 1, as shown in the front and side views of FIGS. 3a and 3b, respectively. Then, a cylindrical ceramic core tube 4 is inserted into the space 2 in the furnace body 3a from one end of the furnace body 3a to the other end, and a heater (not shown) arranged in the space 2 is used to heat the furnace core tube. Generally known are those in which the object to be fired in the chamber 4 is fired. A furnace body 3b having the same configuration as this furnace body 3a is stacked on top of the furnace body 3a. A partition wall 5 is formed in each space 2 of the furnace bodies 3a and 3b in order to obtain a desired heat distribution in the axial direction of the furnace tube 4.

By the way, in the ceramic firing apparatus having the above configuration, the furnace bodies 3a and 3b are
When the furnace bodies 3a and 3b are constructed, in order to change the internal structure of the furnace bodies 3a and 3b, all of the refractory and insulating bricks that make up the furnace bodies 3a and 3b must be rearranged. In particular, in order to change the internal structure of the lower furnace body 3a, the upper furnace body 3b, which weighs more than 500 kilograms, had to be removed, which required a great deal of time and effort. For this reason, it has been practically impossible to stack another furnace body (not shown) on top of the furnace body 3b to form a multi-stage structure.

(Purpose of the Invention) The present invention has been made in view of the above-mentioned problems in ceramic firing equipment, and it is possible to rearrange and maintain the lower furnace body without removing the upper furnace body even if the furnace bodies are stacked in multiple stages. The purpose of the present invention is to provide a ceramics firing apparatus that enables the firing of ceramics.

(Structure of the Invention) Therefore, in the present invention, a cylindrical furnace core tube is inserted into a space formed in the axial center of a furnace body, and a heater disposed in the space is used to cover the inside of the furnace core tube. A ceramic firing apparatus in which a fired product is fired,
The furnace body consists of a plurality of furnace body units arranged in the axial direction of the furnace core tube. It is characterized by being placed so that it can be inserted and removed in a direction perpendicular to the direction.

In the present invention, preferably, the furnace body unit has a hole constituting the space, and both openings of the hole are provided with furnace materials that protrude into the space, and adjacent Furnace materials constitute partition walls.

The above-mentioned furnace body unit can be inserted and removed in a direction perpendicular to the axial direction of the furnace core tube along a shelf provided on the furnace frame that supports the furnace body, and can be used to change or maintain the internal structure of the furnace body. In this case, after the furnace core tube is pulled out, the necessary furnace unit is removed from the furnace frame and the necessary treatment is performed.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

In FIGS. 1a and 1b, the furnace frame 11 has shelves 12 and 13. A furnace body 15 consisting of a plurality of furnace body units 14 is placed on the shelf 12. Furthermore, a furnace body 17 consisting of a plurality of furnace body units 16 is placed on the shelf 13.

As shown in FIG. 1b, the furnace unit 14 is inserted between the shelves 12 and 13 from the front of the furnace frame 11 in the direction shown by arrow A, and is stopped by a stopper 18 provided on the shelf 12. I can guess.
The plurality of furnace body units 14 are abutted by stoppers 18 and arranged coaxially, and square holes 14 formed in each of these furnace body units 14 are arranged coaxially.
A furnace core tube 19 made of ceramics is inserted through a.

Regarding the furnace body unit 16, the furnace body unit 1
4, arrow A from the front of the furnace frame 11
It is inserted between the shelf 13 and the dot plate 21 on the upper part of the furnace frame 11 in the direction shown by , and is stopped by a stopper 18 provided on the shelf 13 . The plurality of furnace body units 16 are arranged coaxially and stopped by a stopper 18, and these furnace body units 1
A furnace core tube 22 made of ceramics is inserted into a rectangular hole 16a formed in each of the holes 16a.

Both of the above-mentioned furnace units 14 and 16 are
As shown in FIGS. 2a and 2b, a furnace material 23 such as a ceramic board or fireproof insulation brick
As shown in Figure 2c, the cross-sectional shape is L.
Furnace unit frame 24 made of steel material in the shape of a
built within. The wall thickness between the inner surface of the cavity 14a of the furnace body unit 14 and the outer surface of the furnace body unit 14 is 150 mm to 200 mm.

As already explained, the cylindrical core tube 19 is inserted into the hole 14a of the furnace body unit 14, and rod-shaped rods are inserted above and below the core tube 19 in the hole 14a in a direction perpendicular to the core tube 19. heaters 25 are arranged respectively. The distance between the furnace core tube 19 and the heater 25 is 30 mm to 50 mm, and the distance between the heater 25 and the floor or ceiling surface of the cavity 14a is 10 mm to 30 mm. In addition, the furnace core tube 19 and the cavity 14a
The distance from the side wall is 10mm to 20mm. Furthermore, it is preferable that the heat generation length of the heater 25 in the cavity 14a is 3/2 or more of the outer diameter of the furnace core tube 19.

The thickness _t1 of the furnace body unit 14 is determined by the required temperature distribution of the furnace tube 19, and is between 100 mm and 300 mm. In addition, the distance g between the furnace material 23a (see FIG. 2b) at both openings of the cavity 14a and the furnace core tube 19 is set to 5 mm or less in order to suppress heat loss due to convection or radiation within the cavity 14a. It is preferable.

The furnace body unit 16 also has exactly the same configuration as the furnace body unit 14 described above.

As already explained, a plurality of furnace units 14
As shown in FIGS. 1a and 1b, the furnace body 1 is placed on the shelf 12 of the furnace frame 11.
form 5. A furnace core tube 19 is inserted into a space 26 formed by the holes 14a of each furnace unit 14 at the axial center of the furnace body 15.

Similarly, a plurality of furnace units 16 are placed on the shelves 13 of the furnace frame 11 to form one furnace body 17. The furnace tube 22 is inserted into a space 27 formed by the holes 16a of each furnace unit 16 at the axial center of the furnace body 17.

As shown in FIG. 1b, the width w ₁ of the furnace body frame 11 is the width w 1 at the front and rear when the furnace body units 14 and 16 are placed at the center in the width direction of the shelves 12 and 13, respectively. ₂ is sized so that a space 28 with w ₂ =70 mm to 150 mm is formed.
A terminal of the heater 25 (not shown) is provided in this space 28.
is placed.

On the other hand, the length l of the furnace frame 11 is 1.64×, assuming the total thickness L of the furnace units 14 and 16 and the surface temperature of the furnace units 14 and 16 to be 200°C.
10 ^-6 ×200×L≒4×10 ^-4 Add L to L, l=
4×10 ^-4 L+L.

By doing the above, when repairing the furnace body 15 located below the furnace body 17 or when changing the internal structure of the furnace, the furnace body 17 on the upper shelf can be moved to the furnace frame 15.
It becomes possible to work while the furnace is placed on the shelf 13 of the furnace body 15, and maintenance of the furnace body 15 and changes in the internal structure of the furnace become easy. Similarly, maintenance of the furnace body 17 and changes in the internal structure of the furnace can be easily performed.

In the above embodiment, a two-stage furnace in which the furnace body 17 is placed above the furnace body 15 has been described, but it is also possible to configure a furnace with three or more stages.

Further, heaters include rod-shaped heaters, U-shaped heaters, spiral-shaped heaters, and the like, and any heater shape may be used.

(Effects of the Invention) As is clear from the detailed description above, the present invention provides a ceramic firing apparatus having a furnace core tube, in which the furnace body is arranged in the axial direction of the furnace core tube, and the furnace body is arranged in the axial direction of the furnace core tube. The furnace consists of a plurality of furnace units that are removably inserted in a direction perpendicular to the axial direction of the furnace core tube along a shelf provided on the supporting furnace frame. For structural changes or maintenance, pull out the furnace core tube from the furnace body, then pull out the necessary furnace unit from the furnace frame along the shelf in a direction perpendicular to the axis of the furnace core tube, and perform the necessary measures. Even if the furnace bodies are stacked in multiple stages, it is possible to obtain a ceramic firing apparatus in which maintenance and changes in the internal structure of the furnace bodies are easy.

In addition, if the furnace material of the furnace body unit protrudes into the space and forms a partition wall, the effect of heat from the adjacent furnace body unit is blocked by the partition wall, so that the heating and cooling curves of the furnace body can be set arbitrarily and precisely.

[Brief explanation of the drawing]

FIG. 1a is a front view of one embodiment of the ceramic firing apparatus according to the present invention, and FIG. 1b is the − of FIG. 1a.
2a is a front view of the furnace unit; FIG. 2b is a sectional view taken along the - line in FIG. 2a; FIG. 2c is a perspective view of the furnace unit frame;
FIG. 3a is a front view of a conventional ceramic firing apparatus, and FIG. 3b is a side view of the ceramic firing apparatus of FIG. 3a. 11... Furnace frame, 12, 13... Shelf, 1
4...Furnace body unit, 15...Furnace body, 16...Furnace body unit, 17...Furnace body, 19, 22...Furnace core tube, 24...Furnace body unit frame, 25...Heater.

Claims (1)

[Claims] 1. A cylindrical furnace core tube is inserted into a space formed in the axial center of the furnace body, and a material to be fired in the furnace core tube is fired by a heater placed in the space. The furnace body is composed of a plurality of furnace body units arranged in the axial direction of a furnace core tube, and these furnace body units are arranged on shelves provided in a furnace frame supporting the furnace body. A ceramic firing apparatus characterized in that the ceramics firing apparatus is mounted so as to be removable in a direction perpendicular to the axial direction of the furnace core tube. 2 Each of the above-mentioned furnace body units has a hole constituting the above-mentioned space, and both openings of this hole are provided with furnace materials that protrude into the above-mentioned space, and adjacent furnace materials are separated from each other by a partition wall. A ceramics firing apparatus according to claim 1, characterized in that the apparatus comprises: