JP2522878B2 - Ceramic product firing furnace - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a ceramic product firing furnace.

[0002]

2. Description of the Related Art Firing of a ceramic product is carried out through steps of debinding, firing and cooling, and in the debinding zone of a furnace body, a large amount of binder is evaporated from the product and fills the furnace. Conventionally, this binder gas has been discharged to the outside through a discharge hole provided in the ceiling of the furnace body. However, such a conventional structure has a problem that the refractory on the ceiling of the furnace body is easily damaged by the high-concentration binder gas. Further, in the conventional structure, a flow toward the discharge hole in the ceiling portion is generated inside the furnace chamber, the temperature inside the furnace chamber increases as it goes upward, and the temperature distribution is not evenly distributed. There was a large difference in timing, which was one of the causes of uneven firing and characteristic fluctuations of products in the firing process.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and prevents damage to the furnace body due to a high concentration of binder gas, and at the same time makes the temperature distribution in the furnace uniform. The present invention has been made to provide a ceramic product firing furnace capable of uniformly firing a product.

[0004]

Means for Solving the Problems] The present invention has been made in order to solve the aforementioned problem, floor hearth debinding zone
Below, to form a combustion chamber having a burner, an internal combustion chamber and the furnace chamber, the length of the furnace to the burner
It is characterized in that they are communicated with each other through a through hole provided at a position displaced in the hand direction .

[0005]

The present invention will be described in more detail below with reference to the embodiment of the bed plate type pusher furnace shown in the drawings. 1 and 2 are sectional views in a debinding zone of a bed plate type pusher furnace for firing a ceramic product of an example, FIG. 1 shows a section without a burner, and FIG. 2 shows a section with a burner. Shows. In these drawings, 1 is a furnace body, 2 is a hearth plate thereof, 3 is a bed plate that travels on the hearth plate 2, W is a bed plate 3
It is a ceramic product loaded on top of. Reference numeral 4 is a muffle-type electric heater provided on both sides of the furnace body 5, reference numeral 5 is a furnace gas suction cylinder provided in the central portion of the furnace chamber, and reference numeral 6 is a fan provided above the suction cylinder.

In the present invention, a combustion chamber 7 is formed under the floor of the hearth plate 2, and burners 8 are provided in a staggered arrangement at one end thereof. Further, the hearth plate 2 is formed with a through hole 9 for communicating the inside of the furnace chamber with the combustion chamber 7. The through hole 9 is provided at a position shifted from directly below the suction cylinder 5. This is to prevent a reduction in the suction effect of the through holes 9. Further, the through hole 9 is also in the longitudinal direction of the furnace with respect to the burner 8 .
It is provided at a position displaced from each other in the direction. This is to prevent the frame of the burner 8 from blowing out from the through hole 9. In the embodiment, the exhaust chamber 10 is formed further below the combustion chamber 7, and the combustion gas in the combustion chamber 7 is exhausted to the outside via the exhaust chamber 10. As shown in FIG. 1, the exhaust chamber 10 is also provided so as to be displaced from the burner 8.

Such an underfloor combustion chamber 7 can be formed not only in the debinding zone but also in the firing zone as long as the temperature inside the furnace is 1000 ° C. or lower. Further, the present invention is not limited to the bed plate type pusher furnace as in the embodiment.

[0008]

In the ceramic product firing furnace of the present invention thus constructed, the binder gas evaporated from the product W is sucked from the through holes 9 of the hearth plate 2 and enters the combustion chamber 7 under the floor, and is burned by the burner 8. Burned. Then, the combustion gas is promptly discharged to the outside through the exhaust chamber 10.
As a result, a downward flow is formed inside the furnace chamber toward the through holes 9 formed in the furnace floor, and the heat generated by the combustion of the binder gas heats the furnace chamber from below the floor. The temperature of the lower part is increased, and the temperature inside the furnace chamber is prevented from becoming higher as it goes up as in the conventional case. Therefore, in the ceramic product firing furnace of the present invention, the temperature distribution in the furnace can be made uniform, and at the same time, debinding can be progressed uniformly. For this reason, it is possible to eliminate uneven firing and characteristic fluctuation of the product in the firing process.

In the ceramic product firing furnace of the present invention, the binder gas generated from the product is sucked from the through holes 9 into the combustion chamber 7 under the floor without being filled in the furnace chamber, and is quickly burned. Unlike the structure in which the binder gas is discharged to the outside from the ceiling portion as described above, it is possible to prevent the furnace body from being damaged by the high concentration binder gas.

[0010]

As described above, in the ceramic product firing furnace of the present invention, a combustion chamber equipped with a burner is formed under the hearth of the debinding zone to burn the binder gas. It is possible to prevent the furnace body from being damaged by the high concentration of binder gas, to make the temperature distribution in the furnace uniform, and to eliminate the binder unevenness and characteristic fluctuations by uniformly debinding. You can Therefore, the present invention contributes greatly to industrial development as a ceramic product firing furnace that solves the conventional problems.

[Brief description of drawings]

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

FIG. 2 is a sectional view at another position of the embodiment of the present invention.

[Explanation of symbols]

 1 furnace body 2 hearth plate 3 base plate 7 combustion chamber 8 burner 9 through hole

Claims (1)

(57) [Claims] 1. A under the floor of the hearth debinding zone, to form a combustion chamber having a burner, an internal combustion chamber and the furnace chamber, in the longitudinal direction of the furnace with respect to the burner
A ceramic product firing furnace characterized in that they are communicated with each other through through holes provided at offset positions .