JPH063065A - Batch type kiln - Google Patents

Abstract

PURPOSE:To provide a title kiln with sharply improved quality of an article to be calcined by heating and calcining the article contained in a container box disposed in a calcination chamber at uniform temperature even if calcination temperature is non-uniform at locations in the kiln owing to deterioration of a heating mechanism and owing to the existence of a convection of radiation heat in the calcination chamber. CONSTITUTION:A number of heaters 24, 26 are vertically disposed in a calcination chamber 10 as a heating mechanism and a container box 20 in the calcination chamber 10 is heated by the heaters 24, 26 to calcine an article contained therein and the container box 20 is moved with a number of rollers 28 as a movement mechanism. The container box is moved in the calcination chamber as above, so that the article is calcined at uniform temperature even if temperature distribution in the calcination chamber is non-uniform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch-type firing furnace for heating an object to be fired in a container inside the firing chamber by a heating mechanism provided in the firing chamber.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a conventional batch type firing furnace, and FIG. 6 is a sectional view as seen from the front thereof.
FIG. 4 is a sectional view as seen from the side surface thereof. Referring to these drawings, the hearth 102 attached to and detached from the lower surface opening of the hearth body 100 is lowered by a screw jack to a lower position (not shown), and a base plate 104 is placed on the hearth 102 at a predetermined lowering position. In addition, the storage box 10 containing the object to be fired in this mounted state
6 are stacked vertically on the base plate 104 in a plurality of stages, and when this stacking is completed, the hearth 102 together with the base plate 104 is lifted to the position shown by a screw jack or the like (not shown). And closing the opening of the furnace body 100 to complete the insertion of the housing box 106 into the furnace, and then actuating the plurality of heaters 108 as heating mechanisms arranged in the furnace to house the housing box. The object to be fired in 106 is fired according to a predetermined temperature profile while being controlled and controlled by a program temperature controller or the like, and after the firing, the hearth 102 is lowered again with a screw jack to fire the object to be fired from the accommodation box 106. The product is taken out, and the baking of one batch is completed, and the baking of each batch is repeated as described above.

[0003]

In such a batch type firing furnace, since the housing box 106 in the furnace is fixed in position from the start to the end of firing, the heater 108 in the furnace is partly fixed. When there is a temporary deterioration or the temperature atmosphere of the entire furnace is not uniform due to the convection of the radiant heat in the furnace, each of the containers in the storage boxes 106 stacked in different positions on the base plate 104 is deteriorated. Storage boxes 10 stacked at the same position as well as baked products
Even each of the objects to be fired in 6 is not necessarily heated and fired at the same temperature, and as a result, the objects to be fired are not fired at the same baking temperature each other. However, there was a problem that the quality of the product would be greatly reduced.

Therefore, in the present invention, even if the firing temperature at each location in the firing chamber is not uniform due to deterioration of the heating mechanism such as a heater or convection of radiation heat in the firing chamber, It is an object of the present invention to enable the material to be fired stored in the storage box to be heated and baked at a uniform temperature so that the quality of the baked product can be greatly improved.

[0005]

In order to achieve such an object, in the present invention, a heating mechanism is provided in the firing chamber, and the inside of a container box provided with the heating mechanism in the firing chamber. In the batch type firing furnace for heat-treating the article to be fired, a moving mechanism for moving the storage box in the firing chamber is provided.

[0006]

The object to be fired is moved in the baking chamber together with the container by moving the container with the moving mechanism. Therefore, even if the temperature in the baking chamber is not uniform, the object to be baked in the container is moved by the movement. It will be heated and baked at about the same temperature.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 4 relate to Example 1 of a batch type firing furnace of the present invention. FIG. 1 is a sectional view of the batch type firing furnace as seen from the front, and FIG. 2 is a line AA of FIG. FIG. 3 is a side sectional view taken along the line, FIG. 3 is a side sectional view of an essential part around the left furnace body wall of the firing furnace, and FIG. 4 is a side sectional view of an essential part around the right furnace body wall.

Referring to these figures, the firing furnace 2 is arranged horizontally on a floor surface (not shown),
The furnace body wall 4 constituting it is provided with a heat insulating material 8 made of a relatively thick heat insulating board or the like on an inner surface of a frame 6, and an internal space surrounded by these serves as a firing chamber 10.

A gas injection pipe 12 made of an alumina tube or the like is attached through the left furnace wall 8a in the firing chamber 10, and an atmospheric gas is supplied from the gas injection pipe 12 into the firing chamber 10. Further, a gas exhaust pipe 14 made of an alumina tube or the like is also attached to the left furnace body wall 8a so as to penetrate through the left furnace body wall 8a.
The atmospheric gas in 0 is exhausted to the outside.

In the firing chamber 10, a base plate 22 on which a storage box 20 containing the object to be fired is placed by opening a door 18 attached to the opening 16 of the right furnace wall 8b is installed in the firing chamber 10. It can be inserted in the left-right direction when viewed from the front. Inside the firing chamber 10, two rows of heaters 24 and 26 are arranged vertically.
And a row of rollers 28 as an example of a moving mechanism are arranged in the left-right direction when the firing chamber 10 is viewed from the front, and the rows of heaters 24 and 26 are respectively provided with a plurality of heaters 24a arranged at appropriate intervals. , 26a ..., each heater 24a, 26a is formed in the shape of a rod that is long when viewed from the side, and the roller row 28 is
It is composed of a plurality of rollers 28a ... Alumina tubes arranged at appropriate intervals in the left-right direction when viewed from the front, and mullite tubes or the like.

Each of the rollers 28a has a shape of a hollow rod which is long when viewed from the side, and the inside of the firing chamber 10 located between the two furnace body walls 8c and 8d with both ends protruding outside the front and rear furnace body walls 8c and 8d. It is installed in a passed state.

Frames 30 and 32 are attached outside the furnace walls 8c and 8d in the front and rear portions, respectively. Each of these mounts 3
Reference numerals 0 and 32 denote horizontal portions 30a and 32a horizontally attached to the corresponding furnace body walls 8c and 8d, and the respective horizontal portions 30.
a and 32a are attached vertically upwards and are configured in an L shape with vertical portions 30b and 32b, and an appropriate number of bearings 34 and 36 are provided in the horizontal through holes 30c and 32c of the vertical portions 30b and 32b, respectively. The holding pipes 38 and 40 made of SUS are attached via the. Then, both ends of each roller 28a extending outside the furnace body walls 8c and 8d are respectively inserted into the holding pipes 38 and 40 outside the furnace body walls 8c and 8d, and the retaining pins 42 and 44 are attached thereto. After passing through the stopper pins 42 and 44, stoppers 46 and 48 are attached to both ends of the respective stopper pins 42 and 44, whereby the retaining pins 38 and 40 are integrally coupled.

Sprockets 50 are formed on the outer peripheral edges of the end pipes of the holding pipes 40 on the front furnace wall 8d side, and a chain 52 is locked between the sprockets 50. The chain 52 is driven by a drive motor (not shown). Laura 2
When the drive motor is driven, the driving force of 8a is rotationally driven by transmitting the driving force through the chain 52, the sprocket 50, and the holding pipe 40.

The rotation speed and rotation direction of the drive motor are controlled by sequence control or the like for baking the material to be baked in the baking furnace.

Next, a series of operations relating to the heat treatment of the material to be fired in the firing furnace of this embodiment will be described.

A storage box 20 containing an object to be fired on a base plate 22.
When the stacking is completed, the door 18 of the right furnace body wall 8b is opened and the base plate 22 is loaded into the firing chamber 10. After this loading is completed and the door 18 is closed, the drive motor is operated in accordance with a predetermined sequence, and the internal heater arrays 24 and 26 are heated by the programmed temperature controller. Then, the object to be fired in the housing box 20 on the base plate 22 starts to be heated by the heater rows 24 and 26, and the base plate 22 is moved from the right side position to the left side position in the figure by the roller row 28. Then, when the base plate 22 reaches the left furnace wall 8a, the rotation direction of the roller row 28 is reversed by the drive motor, and the base plate 22 is moved to the right side.

By repeating such movement and heating, while the object to be fired is being heated and fired, the object to be fired constantly moves back and forth in the firing chamber 10 in the left-right direction. In this case, the heater rows 24 and 26 are deteriorated, or there is convection of heat due to the radiant heat from the heater rows 24 and 26. The baked product is heated and baked at a uniform temperature as a whole by its reciprocating movement,
The quality of the baked product is improved.

FIG. 5 is a sectional view of a batch type firing furnace according to the second embodiment of the present invention as seen from the front, and FIG.
Throughout the drawings, parts and components corresponding to those in FIG. 4 are designated by the same reference numerals, and detailed description of the parts and components designated by the same reference numerals is omitted.

In the firing furnace of the second embodiment, the inside of the furnace is divided by two partition plates 54 and 56 into upper, middle and lower three-stage firing chambers 10a, 10b and 10c. Since the chambers 10a, 10b and 10c have the same configuration as that of the first embodiment, the number of objects to be fired can be tripled as compared with that of the first embodiment, and the yield of the fired products can be greatly improved. Becomes

[0021]

As described above, according to the present invention, since the storage box containing the material to be fired in the firing chamber can be moved by the moving mechanism, even if the temperature in the firing chamber is non-uniform The object to be fired in the box is heated and fired at about the same temperature due to its movement, and as a result, the heating mechanism such as the heater is deteriorated or there is convection of radiant heat in the firing chamber. Even if the firing temperature at each location in the firing chamber is not uniform, the objects to be fired stored in the storage box in the firing chamber can be heated and fired at a uniform temperature, greatly improving the quality of the fired product. I can do it now.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a batch type firing furnace according to a first embodiment of the present invention as viewed from the front.

FIG. 2 is a cross-sectional view of the batch type firing furnace in FIG. 1 seen from a side surface.

FIG. 3 is a cross-sectional view of a main part of a batch type firing furnace.

FIG. 4 is a cross-sectional view of another main part of the batch type firing furnace.

FIG. 5 is a cross-sectional view of a batch type firing furnace according to a second embodiment of the present invention as seen from the front.

FIG. 6 is a cross-sectional view of a batch type firing furnace according to a conventional example as viewed from the front.

FIG. 7 is a cross-sectional view of the batch type firing furnace in FIG. 6 viewed from a side surface.

[Explanation of symbols]

 4 furnace body 10 firing chamber 20 storage box 22 base plate 24, 26 heater row (heating mechanism) 28 roller row (moving mechanism)

Claims (1)

[Claims] 1. A heating mechanism (24, 2) in the firing chamber (10).
6) is provided and this heating mechanism (24, 2)
6), the storage box (2) provided in the firing chamber (10)
In a batch type baking furnace for heat-treating an object to be baked in 0), a moving mechanism (28) for moving the storage box (20) in the baking chamber (10) is provided. .