JPS6117888A - Ceramics baking furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a ceramic firing furnace that continuously fires ceramic molded bodies, and more specifically, the present invention relates to a ceramic firing furnace that continuously fires ceramic molded bodies. Relating to a ceramic firing furnace in which preheating, firing, and cooling are performed sequentially in the process of descending to the bottom.

(Prior Art) Generally, a horizontal electric furnace called a tunnel furnace or a gas furnace has been used for firing ceramic molded bodies.

As shown in FIG. 4(a), this type of tunnel furnace has a tunnel-shaped furnace body 1 arranged horizontally, and the interior of the furnace body 1 includes a preheating zone la, a firing zone 1b, and a cooling zone 1c. The preheating zone la, firing zone 111 and cooling zone 1c each have a temperature distribution as shown by a polygonal line 111 in FIG. 4(b).

When firing a ceramic molded body in a tunnel furnace having the above-mentioned configuration, as shown in FIG. Pack vertically or horizontally. This sintered box 3 is attached to a base plate 4 as shown in FIG. 4(a).
First, a bushing (not shown) is placed in the preheating zone 1a of the furnace body j as shown by arrow A.

After burning the binder (molding aid) in the ceramic molded body 2 in this preheating zone la (depine removal step), the base plate 4 is bushed into the firing zone 11 of the furnace body 1 to form the ceramic molded body. 2 from 1200°C to 1350°
Fire at a temperature of C. When this firing is completed, the ceramic molded body 2 is bushed into the cooling zone 1c of the furnace body 1 and cooled, and then pulled out from the furnace body 1 as shown by arrow A2.

By the way, in the above-mentioned ceramic firing furnace, it is necessary to use a sintering box 3, but this sintering box 3 has a weight several times as large as the entire ceramic molded body 2 in which it is housed, so it has a low heat capacity. Unfortunately, it is difficult to fire the ceramic molded body 2 in a short period of time, resulting in a large loss of thermal energy, and since the furnace body 1 is arranged horizontally, it requires a large installation area. .

(Object of the Invention) The present invention has been made to solve the above-mentioned problems in horizontally arranged ceramic firing furnaces, and is capable of directly firing ceramic molded bodies without using a sintering box with a large heat capacity. The purpose of the present invention is to provide a ceramic firing furnace that is small in size and consumes little energy.

(Structure of the Invention) For this reason, the present invention provides for sequentially preheating, firing and A ceramic firing furnace in which cooling is performed and a fired ceramic molded body is taken out from the lower part of the furnace core tube, the intermediate portion of the furnace core tube being surrounded by a furnace body including a heater, and the intermediate portion of the furnace core tube being surrounded by a furnace body including a heater. The feature is that the ceramic molded body is preheated by the heat rising from the inside.

(Example) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in Fig. 1, a cylindrical reactor core tube 6 is fixed vertically to the center of a frame 5 formed by welding L-shaped steel or U-shaped steel so that both west sides have a rectangular shape. has been done. The furnace core tube 6 is made of a heat-resistant material such as alumina, norconya, or silicon carbide, and has an inner diameter of, for example, 6c+nφ to 10cn+φ.

In the furnace core tube 6, an intermediate portion 6c located between an upper portion 6a and a lower portion 61 is surrounded by a furnace body 9 made of asbestos or the like and including a heater 7 and a space 8. Above heater 7
The heat generated is applied to a cylindrical ceramic molded body 10 having a height of 5 to 60,101 mm, as shown in FIG. It will be done.

” 1. The ceramic molded body 10 has an upper end 6d of the furnace core tube 6.
This is continuously supplied to the furnace core tube 6, and the bottom 1 of the furnace core tube 6 is
The fired ceramic molded body 10 is discharged and taken out onto a cart 12 disposed below the discharge port 11 attached to the discharge port 6e. The above-mentioned ceramic molded body] 0 is taken out by applying vibration to the discharge port 11 or by scraping.

The heat applied from the heater 7 of the furnace body 9 to the ceramic molded body located inside the intermediate portion 6C of the furnace core tube 6 also rises into the upper part 6a of the furnace core tube 6, and the ceramic molded body 10 therein rises into the upper part 6a of the furnace core tube 6. is preheated before being fired in the intermediate portion 6c of the furnace core tube 6.

In order to burn the binder contained inside the ceramic molded body 10 during this preheating process, an air supply pipe 13 made of a material such as stainless steel is inserted into the upper part 6a of the furnace core tube 6.

The internal temperature distribution from the upper end 6d to the lower end 6e of the furnace core tube 6 is shown by a curve 112 in FIG.

(10) cm and 100 cm on the X axis in FIG. 3 correspond to the second end 6d and the lower end 6e of the core tube 6 in FIG.
At the cm position, it is approximately 500°C, S' included in the middle part 6C
The temperature is about 1150°C at the position Oc+n, about 500°C at a position of 80 cm included in the lower part 6b, and about 200°C from the discharge port 10.
is discharged.

In the ceramic firing furnace having the configuration explained above,
A ceramic molded body 10 as shown in FIG. 2, for example, which can be fired in a relatively short time of about 2 to 3 hours.
is filled into the furnace core tube 6 from its J:, i@6d, and as mentioned above, the ceramic molded body 9 is continuously removed by applying vibration to the discharge port 11 at the lower end 6e of the furnace core tube 6 or by scraping. to be discharged. By doing this, as the ceramic molded body 10 sequentially descends in the furnace tube 6 to its upper part 6a, middle part 6c, and lower part 6b, the binder in the ceramic molded body 10 is automatically burned, and the ceramic molded body 10 is fired and cooled, and the ceramic molded body 1() can be fired extremely efficiently.

In the embodiment shown in FIG. 1, compared to the conventional tunnel furnace shown in FIG.
The electrical energy required per () could be reduced to 1/'3 to 1/4, and the space productivity per unit space could be increased 30 to 40 times.

In the present invention, the ceramic molded body 1 to be fired is directly filled and fired in the furnace tube 6 without using a sintering box as shown in FIG.
0 preferably has a cylindrical shape or a cylindrical shape as shown in FIG.

(Effects of the Invention) As is clear from the detailed description above, the present invention has the following effects:
Since the ceramic molded body is fired while being lowered inside the vertically arranged furnace tube, there is no need for a sintering box with an unreasonable heat capacity for each firing of the ceramic molded body, unlike in conventional tunnel furnaces. There is no wasted energy consumption due to the box, and the firing time can not only be greatly shortened, but also a ceramic firing furnace that requires a very small installation space can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the internal structure of an embodiment of a ceramic firing furnace according to the present invention, FIG. 2 is a perspective view showing an example of a ceramic molded body fired in the ceramic firing furnace of FIG. 1, and FIG. The figure is a temperature distribution diagram inside the furnace tube of the ceramics firing furnace shown in Figure 1. Figure 4 (,) is an explanatory diagram of the conventional ceramics firing furnace. Figure 4 (b) is the ceramics shown in Figure 4 (,). Temperature Distribution Diagram of Firing Furnace, Figure S is a perspective view of a sintering box used in the ceramic firing furnace of Figure 4(a). 6... Furnace tube (6a...upper, 6b...lower +
6c... middle part, 6cl... upper end + 6e...
lower end), 7... Heater, 9... Furnace body, 10... Ceramic molded body, 11... Discharge port, 1
3...Air supply pipe. Patent applicant Murata Manufacturing Co., Ltd. Agent Patent attorney Aoyama Aoyama and 2 others Figure 1, Figure 3, Section 0 200 400 600 800
+000 1200 +400 temperature FC) 21st

Claims (1)

[Claims] (1) As the ceramic molded body descends from the top to the bottom of the vertically arranged furnace core tube, preheating, firing, and cooling are performed sequentially at the top, middle, and bottom of the furnace core tube. A ceramic firing apparatus from which a fired ceramic molded body is taken out from the furnace, the middle part of the furnace tube being surrounded by a furnace body including a heater, and the ceramic molded body being preheated by heat rising from the middle part of the furnace core tube. 1. A ceramic firing furnace characterized by: