JPH0674950B2 - Ceramic firing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a ceramic firing apparatus for firing a ceramic body that has undergone a forming process.

(Prior Art) As a conventional ceramic firing apparatus of this type, there are a mode using a tunnel furnace or a batch furnace and a mode using a rotary hearth furnace.

(Problems to be Solved by the Invention) The former is the most commonly used form, but has the following drawbacks. A box or a base plate for accommodating the ceramic body and supplying it into the furnace is required, and therefore there is energy loss for heating these. Further, since the box and the base plate are consumable items, the cost of the baking apparatus as a whole increases. This requires the step of loading the ceramic body into the box or the base plate, which hinders improvement in workability. Variations in temperature and atmosphere in the furnace and in the box are likely to occur, resulting in non-uniform firing characteristics.

On the other hand, in the latter case of using the rotary hearth furnace, the ceramic body is supplied from the front inlet of the rotary hearth tube and is sequentially sent out to the rear outlet with the rotation of the hearth. No base plate is required, and there is an advantage that the drawbacks seen in the former form can be eliminated.

However, in such a rotary hearth configuration, the following problems newly occur.

That is, in the vicinity of the front inlet of the rotary core tube, the binder (binder) contained in the ceramic body escapes by heating during firing, and the binder decomposition gas that is a combustible gas has a relatively low temperature. As a result of condensation and adhesion on the inner wall surface near the pipe inlet, smooth flow of the ceramic body is hindered.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate the above-mentioned drawbacks in a ceramics firing apparatus configured by using a rotary furnace core tube.

(Means for Solving the Problems) A feature of the present invention is that a ceramic body in which a combustible gas is generated during firing is supplied from a front inlet of a rotary furnace core tube and a rear outlet of the rotary furnace core tube. In the ceramics firing device configured to take out the fired product from the furnace, a means for forcibly supplying air or oxygen is provided inside the front inlet of the core tube.

(Operation) According to this configuration, in the vicinity of the inlet of the rotary core tube, that is, in the zone of relatively low temperature at which the binder escapes from the ceramic body, the binder decomposition gas is sufficiently contacted with the air or oxygen forcibly supplied and burned. .

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings. The figure is a cross-sectional view of a ceramics firing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a rotary mandrel which constitutes a rotary hearth furnace, and this furnace mandrel 1 has excellent heat resistance,
Further, it is composed of ceramics that do not react with the ceramic body W that is the object to be fired, such as alumina and zirconia. Reference numeral 2 denotes a roller that supports the core tube 1 in a tilted posture with a tilt angle of about 0.5 to 2 degrees, and is driven by a motor (not shown) to give the core tube 1 rotation in a fixed direction. 3 is an electric heater wound around the core tube 1 and 4 is a heat insulating material for keeping the temperature of the furnace as a whole. Reference numeral 5 is a chute for supplying the ceramic body W charged in the hopper (not shown) to the front inlet a of the core tube 1, and 6 is a cover plate of the inlet a of the core tube 1.

The above configuration is not particularly different from the conventional one, and the ceramic body W supplied to the inlet a of the core tube 1 through the supply chute 5 rolls as the core tube 1 rotates in a certain direction, It moves to the rear outlet b side, and is heated and baked by the electric heater 3 in the meantime.

Further, in the present invention, the following configuration is further added. That is, at the inlet a of the core tube 1, an air supply pipe 7 for forcedly blowing air through the cover plate 6 of the core tube 1.
Is provided. The binder decomposed gas that has escaped from the ceramic body W due to the blowing of air through the air supply pipe 7 is in good contact with oxygen even in the relatively low temperature region near the inlet a and burns well.

When the air having a high oxygen concentration or oxygen itself is forcibly supplied from the air supply pipe 7, the combustion of the binder decomposition gas is further promoted.

(Effects) As described above, according to the present invention, the binder decomposition gas is prevented from condensing and adhering to the inner wall surface near the inlet of the rotary furnace core tube, and as a result, the smooth flow of the ceramic body can be performed.

[Brief description of drawings]

The figure is a cross-sectional view of a ceramics firing apparatus according to an embodiment of the present invention. In the figure, reference numeral 1 is a rotary mandrel, a is a front inlet, b is a rear outlet, and W is a ceramic body.

Claims (1)

[Claims] 1. A ceramic body, in which a combustible gas is generated during firing, is supplied from a front inlet of a rotary furnace core tube, and
In a ceramics firing apparatus configured to take out a fired product from a rear outlet of the rotary furnace core tube, ceramics provided with means for forcibly supplying air or oxygen inside the front inlet side of the rotary furnace core tube. Baking equipment.