JPH02247496A - Calcination of lengthy pottery molded product - Google Patents

Abstract

PURPOSE:To prevent a lengthy pottery molded product from being bent in a burning process by burning the lengthy pottery molded product constructed vertically supporting the top end of the product by an upper setter. CONSTITUTION:A lengthy pottery molded product 1 is burned, constructed vertically around a vertical column 3 provided on a burning base. An upper setter 5 slidable vertically along the column 3 is fitted in a sliding surface of the column 3 to from a flange part. A circular stepped portion 8 engaging the inside of the upper end of the lengthy pottery molded product 1 is formed on the lower surface of the flange part 7. Once the burning is performed after the upper setter 5 is fitted over the column 3 and a stepped portion 8 of the upper setter 5 is engaged with the upper end 4 of the lengthy pottery molded product 1, the upper end 4 of the lengthy pottery molded product 1 is pressed from the upper portion by the self-weight of the upper 5, and restricted in horizontal movement by the upper setter 5 and the column 3, whereby the lengthy pottery molded product is prevented from being bent in the burning process.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for firing a long hollow ceramic molded product such as an insulator tube.

(Prior art) Long ceramic molded products such as insulator pipes have traditionally been fired standing on a baking stand, but in the case of long ceramic molded products with a height/diameter value of 5 to 8. During the firing process, bending in which the upper end is inclined to one side is likely to occur, and firing defects caused by this bending cannot be ignored.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and
This was completed in order to provide a method for firing a long hollow ceramic molded product having a diameter of 5 to 8 without causing any bending.

(Means for solving the problem) The above problem is characterized in that a long hollow ceramic molded product is erected vertically around a vertical pillar, and the upper end is supported by an upper chestnut that can slide along the pillar while firing. This is achieved by a method of firing long ceramic molded products.

Moreover, even more preferable results can be obtained by fitting a slide guide having a vertically elongated cylindrical portion inside the upper chestnut to prevent the upper ends of the upper chestnut and the long ceramic molded product from tilting while firing.

(Examples) Next, the present invention will be described in more detail with reference to illustrated examples.

In Figure 1, (1) is a hollow, long ceramic molded product such as an insulator tube, and this long ceramic molded product (1) is a vertical pillar (3) erected on a firing table (2). It is fired by standing vertically around it. A top plate (5) that can slide vertically along the pillar (3) is fitted to the upper end (4) of the long ceramic molded product (1). As shown in Fig. 2, the upper plate (5) has a flange portion (7) formed around a short cylindrical portion (6) that becomes a sliding surface with the column (3).
) is formed with a circular stepped portion (8) that engages with the inside of the upper end (4) of the long P4 porcelain molded product (1).

The pillar (3) is made of SiC, for example, and its surface is preferably coated with alumina, and the upper plate (5) is also preferably made of SiC.
) shall have a plurality of craters (9) to ensure a good circulation around the fire during firing, and an appropriate number of craters shall be formed in the stand (2) to ensure a good circulation of the fire from the bottom. (It is preferable to

Fit the top plate (5) like this onto the pillar (3), and then attach the top plate (5) to the pillar (3).
) to the upper end (4) of the long ceramic molded product (1).
When firing is performed as shown in Figure 1, the upper end (4) of the long ceramic molded product (1) is pressed down from above by the weight of the upper plate (5), and the upper plate (5) and the pillar (3)
Since movement in the horizontal direction is restricted by this, bending is prevented from occurring during the firing process. In addition, since the upper plate (5) can slide vertically along the column (3), it slides downward as the long ceramic molded product (1) shrinks during firing, and the upper end (4) of the long ceramic molded product (1) always slides downward as the long ceramic molded product (1) shrinks during firing.
) can be reliably supported.

Furthermore, as shown in Fig. 3, if a slide guide 01lD having a vertically elongated cylindrical portion 01) is fitted inside the upper plate (5) and firing is performed, the occurrence of bending can be more reliably prevented. I can do it. As shown in Fig. 4, the slide guide 0ω has a plurality of arms at the upper end of a vertically elongated cylindrical part 00 having an inner diameter slightly larger than the outer diameter of the column (3) and which presses the upper surface of the upper plate (5). Each arm 0 has a structure in which only the tip thereof is bent downward so as not to block the crater (9) of the upper plate (5). When firing is performed using such a slide guide 0 (D), the slide guide aω shrinks due to firing because the vertically long cylindrical part θD is in contact with the outer surface of the column (3) over a considerable length. Even if it contracts, it will not tilt, and therefore the upper plate (5) pressed by the tips of the arms 021 of this slide guide OI will not tilt either, so the long body supported by the upper plate (5) will not tilt. The horizontal movement of the top of the ceramic molded product (1) (4) is more reliably prevented.As a result, if firing is performed using the slide guide aω as shown in Figure 3, the first As shown in the figure, the bending of the long ceramic molded product (1) can be further reduced compared to the case where only the upper plate (5) is used for firing.

(Effects of the Invention) As explained above, the present invention prevents the long ceramic molded product from bending during the firing process by performing firing while supporting the upper end of the vertically erected long ceramic molded product with the upper plate. be able to. Furthermore, by fitting a slide guide with a vertically elongated cylindrical part into the inside of this upper plate and performing firing, it is possible to prevent the upper plate from tilting, and even more reliably prevent the occurrence of bending while firing. can. Therefore, the present invention is suitable for firing insulator tubes and other long ceramic molded products with a height/diameter value of 5 to 8, and can greatly contribute to the development of industry.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the firing method of the present invention, Fig. 2 is a partially cutaway perspective view showing the upper plate used in this, and Fig. 3 is a main part showing the further improved firing method of the present invention. Cross section, 4th
The figure is a partially cutaway perspective view of a slide guide used for this. (1): Long ceramic molded product, (3): Column, (4): Upper end, (5): Upper plate, 0ω Nislide guide, 01): Cylindrical part.

Claims (1)

[Claims] 1. A hollow, long ceramic molded article (1) is erected almost vertically around a vertical column (3), and its upper end (4) can be slid along the column (3). 5) A method for firing a long ceramic molded product characterized by firing while supporting it. 2. By fitting the slide guide (10) having a vertically long cylindrical part (11) into the inside of the upper chestnut (5),
The method for firing a long ceramic molded article according to claim 1, wherein the firing is performed while preventing the upper end (4) of the long ceramic molded article (1) from tilting.