JP2000320976A - Method and system for firing ceramic pipe continuously - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a product having high straightness by firing a ceramic pipe having substantially circular cross-section while rolling on the floor of a furnace thereby reducing vertical temperature difference extremely and suppressing uneven firing. SOLUTION: A ceiling plate 2 is applied to the upper surface of a low furnace body 1 and a tunnel having a low furnace chamber 3 elongated in the carrying direction of an article to be fired is provided. Refractory rods 4 are then arranged in zigzag in the longitudinal direction on the furnace floor. Guide bodies 6 having recessed cross-section are disposed on the opposite sides of the furnace floor over the entire length of the furnace body 1 and an elongated traveling body 8 integrated with a piece 9 projecting into the furnace body 1 is fitted in a groove-like guide path 7 opening to the upper surface thereof and guided. The projecting pieces 9 of the traveling bodies 8 on the opposite sides are inserted into the opposite ends of a ceramic pipe (a) having substantially circular cross-section and the ceramic pipe (a) is rolled in the furnace chamber 3 as the traveling body 8 travels thus firing it with the flame os burners 10 disposed on the opposite sides of the furnace chamber 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and an apparatus for continuously firing an unglazed ceramic pipe while rolling it.

[0002]

2. Description of the Related Art Conventionally, when ceramic pipes are fired in a continuous furnace such as a tunnel kiln, the ceramic pipes are erected on a carriage and run through the furnace.

[0003]

For this reason, the length of a long ceramic pipe in the furnace becomes high, and in particular, the temperature difference between the upper and lower parts of the pre-tropical zone becomes large, so that uneven burning and preheating may easily occur. However, it is necessary to reduce the conveying speed, which hinders the improvement of the firing efficiency.

[0004] Further, in the case of a ceramic pipe having a small diameter relative to its length, since it is easy to fall down due to the vibrations caused by the movement of the bogie, many refractory tools are required to prevent this. There has been a problem that the preparatory work requires a long time and the thermal efficiency is low.

[0005] Further, there is a problem in that the characteristics at the time of molding appear during firing, and bending tends to occur.

[0006]

Means for Solving the Problems, Functions and Effects As means for solving such problems, the invention of claim 1 is directed to a method in which a ceramic pipe having a substantially circular cross section is moved while rolling on a hearth and fired. Therefore, the temperature difference between the upper and lower portions is extremely small, unevenness in baking is reduced, and the product is fired while being rotated.

According to a second aspect of the present invention, there is provided a pair of traveling bodies which are provided with guide paths on both sides in the moving direction of the object to be fired on the hearth and which run at the same speed in opposition to each other along the two guide paths. A projecting piece is formed into the opening at both ends of the ceramic pipe having a substantially circular cross section, and the ceramic pipe is moved while rolling on the hearth by running a pair of traveling bodies, and then fired. It can be moved and fired while being rolled straight from the entrance to the exit on the floor, and the refractory tool to be heated in the furnace is only the traveling body, so that the heat load is small and the thermal efficiency is high.

According to a third aspect of the present invention, in the second aspect of the present invention, since a plurality of traveling bodies are connected in the traveling direction, a large number of ceramic pipes can be continuously traveled to improve the firing efficiency.

According to a fourth aspect of the present invention, in the second or third aspect of the invention, the projection is inserted into the opening of the ceramic pipe with almost no gap in the traveling direction, so that the ceramic pipe has a small relative play with the traveling body. Since the vehicle runs, even if the distance between the front and rear ceramic pipes is reduced, the ceramic pipes do not come into contact with each other, and a large number of ceramic pipes can be placed in a furnace and fired efficiently.

[0010] The invention of claim 5 is the invention of claim 2, 3, or 4.
According to the invention, since the protruding pieces are sufficiently long so as not to fall out of the ceramic pipe due to shrinkage due to firing of the ceramic pipe, even a long ceramic pipe having large shrinkage due to firing can be surely moved.

According to a sixth aspect of the present invention, in the second, third, fourth or fifth aspect of the present invention, a groove is formed in the hearth so that the ceramic pipe is heated from the lower surface, so that the efficiency is improved. Can be fired.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, since the grooves are formed in a zigzag pattern, the ceramic pipe is uniformly heated from the lower surface over the entire length to prevent deformation due to uneven heating. Can be.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 and 2 show a tunnel furnace used in the embodiment of the present invention. The furnace chamber 3 has a low height, and a ceiling plate 2 is placed on the upper surface of the furnace body 1. In the hearth, refractory rods 4 are arranged in a staggered pattern in the longitudinal direction, and grooves 5 are formed in a staggered pattern therebetween.

On both sides of the hearth, a guide body 6 having a concave cross section is disposed over the entire length of the furnace body 1, and a groove opened on the upper surface thereof serves as a guide path 7, and as shown in FIG. A protruding piece 9 is integrally formed on the upper surface of a central portion in the longitudinal direction of the elongated traveling body 8 that fits tightly into the guide path 7 toward the inside of the road body.

The traveling bodies 8 on both sides correspond to each other, are in close contact with each other, and are pushed forward by a pusher (not shown) from the entrance side to move forward.

At the entrance of the furnace body, when the traveling body 8 is inserted into the guide path 7, the protruding pieces 9 are inserted into the base of the ceramic pipe a, and as shown in FIG. The protruding piece 9 pushes the inner peripheral surface of the base body of the ceramic pipe a to roll and move on the hearth.

At this time, if the width of the protruding piece 9 is large enough that its front and rear portions are in contact with the front and rear of the inner periphery of the base of the ceramic pipe a, the play in the front and rear direction of the base of the ceramic pipe a is small, and the conveyance is performed at a constant speed. However, it is necessary to prevent interference due to shrinkage caused by firing the substrate.

A plurality of burners 10 are provided on both sides of the sintering zone in the central portion of the furnace body 1 in the longitudinal direction, and air flows from the outlet of the furnace body 1 toward the entrance. The ceramic pipe a, which has been heated to a high temperature in the central firing zone and fired, is cooled near the outlet and is preheated near the entrance by the hot air flowing from the firing zone. When the ceramic pipe a is taken out from the outlet, the traveling bodies 8 on both sides are also taken out of the furnace.

In the present embodiment, since the grooves 5 are formed in the hearth in a staggered lattice pattern, the ceramic pipe a is also heated uniformly from the lower surface.

The guide body 6 of the embodiment shown in FIG. 5 has a guide path opened laterally so that the projecting piece 9 can be inserted into the ceramic pipe a from the same guide body 8 as in the above embodiment. It has become.

The running body 8 'of the embodiment shown in FIG. 6 has a projecting piece 9' formed at the center of the wall surface thereof, and as shown in FIG. A protruding piece 9 'that is fitted and protrudes from the opening is inserted into the ceramic pipe a.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a rolling state of the ceramic pipe.

FIG. 4 is a perspective view of a traveling body.

FIG. 5 is a cross-sectional view of another embodiment of the guideway.

FIG. 6 is a perspective view of another embodiment of the traveling body.

FIG. 7 is a sectional view showing a use state of the traveling body.

[Explanation of symbols]

 1: Furnace body 5: Groove 7, 7 ': Guideway 8: 8': Running body 9: 9 ': Projection

Claims (7)

[Claims] 1. A continuous firing method for ceramic pipes, wherein a ceramic pipe having a substantially circular cross section is moved while rolling on a hearth and fired. 2. A pair of traveling bodies having substantially circular cross sections are provided with guide paths on both sides of the hearth in the moving direction of the object to be fired, and running along the two guide paths at opposite speeds. A continuous firing apparatus for a ceramic pipe, wherein projections are formed into openings at both ends of the ceramic pipe, and the ceramic pipe is moved while rolling on the hearth and fired by running the pair of running bodies. 3. The continuous firing apparatus for a ceramic pipe according to claim 2, wherein a plurality of the traveling bodies are connected in a traveling direction. 4. The method according to claim 1, wherein the projecting piece is inserted into the opening of the ceramic pipe with almost no gap in the traveling direction so that the ceramic pipe travels with a small relative play with the traveling body. The continuous firing device for a ceramic pipe according to claim 2 or 3, wherein 5. The ceramic pipe continuous type according to claim 2, wherein the projecting piece is sufficiently long so as not to fall out of the ceramic pipe due to shrinkage accompanying firing of the ceramic pipe. Firing equipment. 6. The ceramic pipe according to claim 2, wherein a groove is formed in the hearth so that the ceramic pipe is also heated from below. Continuous firing equipment. 7. The continuous firing device for a ceramic pipe according to claim 6, wherein the grooves are formed in a staggered lattice shape.