JPH0755343A - Burning furnace - Google Patents

Abstract

PURPOSE:To provide a burning furnace in which a color changing can be easily performed and a uniform burning can be carried out. CONSTITUTION:A burning furnace comprises a furnace core pipe 2 arranged in a lateral direction, a furnace body 4 enclosing a circumference of the furnace core pipe 2, and heaters 7A and 7B arranged within the furnace body 4 so as to heat the furnace core pipe 2. The furnace body 4 comprises a furnace main body 4a storing the furnace core pipe 2 and having its upper surface opened, and a lid member 4b for closing its upper surface. The heaters 7A and 7B are arranged at each of opposing inner side surfaces 8A and 8B of the main body 4a of the furnace body, respectively, and at least one of the heaters 7A (7B) is inclined and arranged at an orientation with the upper surface of the main body of the furnace being spaced apart from the other heater 7B (7A) from the bottom part of the main body of the furnace body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a firing furnace used for calcining ceramic raw materials.

[0002]

2. Description of the Related Art Conventionally, there is a rotary retort furnace as a baking furnace used for heat treatment of various objects to be baked. This rotary retort furnace is constructed by surrounding a furnace core tube, which is driven to rotate by a rotary roller unit, with a furnace body, and further, the furnace core tube is heated from the outside by an electric heater arranged in the furnace body. Has become.

As a form of the electric heater, as shown in FIG. 4, a cylinder type heater 51 formed in a tubular shape together with the furnace body 50, or as shown in FIG. 5, along the axial direction of the furnace body 50. Half cylinder type heater 52 divided into two,
52 and a linear SiC heater 5 as shown in FIG.
One in which 3, 53 are vertically arranged through each of the upper and lower sides of the furnace body 50, and as shown in FIG. 7, linear SiC heaters 54, 54 are vertically arranged in each of the left and right sides of the furnace body 50. There is. In these drawings, reference numeral 55 is a furnace core tube.

Such a rotary retort furnace has features such as easy miniaturization, suitability for small-quantity production, and non-limitation of the material to be fired, and is generally used for calcination treatment of ceramic raw materials.

[0005]

By the way, in the firing furnace, when changing the material to be fired, the color changing work, that is, the furnace core tube is replaced in order to avoid mutual influence of the material to be fired. However, the conventional rotary retort furnace has a problem that the replacement work is very troublesome. That is, in the rotary retort furnace, the furnace body 50 needs to be disassembled when the furnace core tube 55 is replaced, and the electric heaters 51, 52, 5 arranged in the furnace body 50 when the furnace body 50 is disassembled.
It was necessary to disassemble 3,54, and the work was troublesome. Furthermore, electric heaters 51, 52, 53, 5
The dismantling of No. 4 required work such as separation of electric wiring and reconnection due to its structure, which was more troublesome.
In addition, at the time of disassembling, there is a high risk that the furnace core tube 55 may come into contact with the furnace body 50, the electric heaters 51, 52, 53, 54, etc. and be damaged.

Further, a linear electric heater heater 53, 5
In the case where 4 is arranged through the furnace body 50, the electric heater 5
3, 54 cannot be brought into close contact with the entire circumference of the furnace core tube 55, which causes a partial variation in the heating temperature of the furnace core tube 55. In both areas 55 in the axial direction), most of the heat conduction is due to convection, so there is a large variation in the heating temperature.
In some cases, 5 was damaged.

Therefore, it is an object of the present invention to provide a firing furnace in which color change is easy and uniform heat treatment is possible.

[0008]

In order to achieve such an object, the present invention is arranged in a horizontally elongated furnace core tube, a furnace body surrounding the furnace core tube, and a furnace body. And a heating body for heating the furnace core tube, and the furnace body includes a furnace body main body having the furnace core tube housed therein and having an upper surface opened, and a lid body closing the upper surface. , The heating bodies are respectively disposed on opposite inner side surfaces of the furnace body, and at least one of the heating bodies is arranged such that a top surface side of the furnace body is separated from a bottom side of the furnace body from the other heating body. They are arranged in a slanted manner, and a firing furnace is constructed from the above.

[0009]

According to the above construction, when the lid is separated from the furnace body, the upper surface of the furnace body is opened, so that the furnace core tube can be easily inserted into and removed from the furnace body from this upper surface. it can. At this time, since the heating body is provided on the furnace body side, it is not necessary to disassemble the heating body when disassembling the furnace body.
Further, at least one of the heating bodies is inclined so that the upper surface side of the furnace body is separated from the bottom side of the furnace body, so that the distance between the heating bodies on the upper surface side becomes wider. The core tube can be taken in and out smoothly without contacting the heating element.

Further, since the heating elements are arranged in such an inclined manner, the heating elements are separated from each other on the upper surface side and are closer to each other on the bottom side of the furnace body main body, so that the heating effect on the bottom side of the furnace body body is achieved. Will increase. Such an increase in the heating effect on the bottom side cancels out the temperature variation in the furnace body due to convection generated by the heating of the heating body, so that the heating state in the furnace body becomes uniform.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a firing furnace according to an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view showing its disassembled state.

This firing furnace 1 has a furnace core tube 2 arranged horizontally
And a rotary roller portion 3 for rotationally driving the furnace core tube 2, and a furnace body 4 surrounding the furnace core tube 2. Furnace core tube 2
Has both ends open, one end (the left end in the drawing) of the baking target, and the other end (the right end of the drawing) the discharging port 6 of the baking target. The furnace body 4 is composed of a furnace body body 4a having an open upper surface and a lid body 4b for closing the upper surface. If the heat treatment temperature of the baking furnace 1 is a low temperature range of 1000 ° C. or lower, Inconel, etc. On the other hand, if the heat treatment temperature is in the high temperature range of 1000 ° C. or higher and 1400 ° C. or lower, it is composed of ceramics such as alumina. The furnace core tube 2 configured in this manner is arranged with the side of the workpiece outlet 6 facing downward and slightly inclined.

The firing furnace 1 includes heating elements 7A and 7B. The heating elements 7A and 7B are provided on the opposing inner side surfaces 8A and 8B in the furnace body 4a, respectively. Each heating body 7
A and 7B are composed of a plurality of U-shaped SiC heaters 9, ..., These SiC heaters 9 ,.
Along the lines A and 8B, they are vertically arranged with a slight inclination.
The inclination direction of each of the SiC heaters 9 is such that the furnace body main body upper surface side is separated from the other heater body 7B, 7A from the furnace body main body bottom portion side. Specifically, each U-shaped S
The upper ends of the iC heaters 9 ... Are opposed to the inner side surfaces 8A, 8B.
And the lower end of the inner surface 8A, 8B
It is tilted by being separated from. Therefore, while the upper ends of the heating elements 7A and 7B are most distant from each other within the width of the furnace body, the heating elements 7A. The lower ends of 7B are arranged close to each other to the extent that they do not contact the furnace core tube 2.

In this firing furnace 1, the material to be fired, which has been charged into the furnace core tube 2 from the object to be fired 5 is moved to the side of the object to be fired 6 by the rotation of the furnace core tube 2, and a heating element is provided therebetween. 7A,
The material to be fired is calcined by heating 7B, and the material to be calcined, which has been subjected to the calcining treatment, is carried out from the material carrying-out port 6 to the outside of the furnace core tube 2.

In such a calcination process, the heating element 7
Since A and 7B are arranged in an inclined manner as described above and the heating elements 7A and 7B are closer to each other from the lower side of the furnace core tube 2 than the upper side, the heating effect thereof is enhanced. On the other hand, this firing furnace 1
When the heating elements 7A and 7B are respectively arranged on the left and right sides of the furnace core tube 2 as described above, due to convection generated in the furnace body 4,
The temperature of the upper side of the furnace core tube 2 becomes higher than that of the lower side thereof. for that reason,
Since the increased heating effect on the lower side of the furnace body 4 due to the inclined arrangement of the heating elements 7A and 7B cancels the temperature variation due to convection,
The temperature distribution in the furnace body 4 during heating is made uniform.

The cancellation of such temperature variations is particularly effective in a low temperature area of the furnace core tube 2 (areas at both axial ends of the furnace core tube 2) which is mainly heated by heat conduction by convection.
Temperature variations that tend to occur here can be reliably prevented, and therefore, the furnace core tube 2 is hardly damaged by a thermal shock resulting from such temperature variations.

When the color of the firing furnace 1 is to be changed, the method shown in FIG.
As shown in FIG. 4, after the lid 4b is separated from the furnace body 4a, the furnace core tube 2 is taken out from the upper surface of the furnace body 4a. At this time, since the heating bodies 7A and 7B are provided on the furnace body 4a side, it is not necessary to disassemble the heating bodies 7A and 7B when disassembling the furnace body 4. Furthermore, since the distance between the heating elements 7A and 7B is larger on the upper surface side of the furnace body 4a than on the bottom side of the furnace body 4a, the furnace body 4a
On the other hand, the furnace core tube 2 can be smoothly taken in and out, and the inconvenience that the furnace core tube 2 is brought into contact with the heating elements 7A, 7B and the like to damage each other during the taking in and out is less likely to occur.

According to the present invention, as shown in FIG. 3, the partition walls 10, ... Which divide the inside of the furnace body into a plurality of parts along the longitudinal direction thereof are arranged in the furnace body 4, and the partition walls 10 ,. Heaters 7A and 7B are provided so that the heating areas in the furnace body 4 divided by ... can be heated under different temperature gradients.
If the control is performed separately, the heating temperature can be controlled more strictly.

[0019]

As described above, according to the present invention, the furnace core tube can be easily put in and taken out from the upper surface of the furnace body, and further, it is not necessary to disassemble the heating body when disassembling the furnace body. As a result, the color can be changed easily.

Further, at least one of the heating bodies is inclined so that the upper surface of the furnace body is separated from the bottom of the furnace body, so that the distance between the heating bodies on the upper surface is wide. As a result, the furnace core tube can be smoothly taken in and out without contacting the heating body or the like, and the furnace core tube is less likely to be damaged by contacting the heating body or the like during color change.

Further, since the heating elements are arranged so as to be inclined in this way, the heating elements are separated from each other on the upper surface side and approach each other on the furnace body main body bottom side, so that the heating effect on the furnace body main body bottom side is achieved. It will increase. Therefore, due to such an increase in heating effect, it is possible to cancel the temperature variation in the furnace body due to convection generated by heating of the heating element, and therefore the temperature in the furnace body can be made uniform and a uniform heat treatment can be performed. In addition, the furnace core tube is less likely to be damaged by thermal shock.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the overall structure of a firing furnace according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a disassembled state of a firing furnace of an example.

FIG. 3 is a cross-sectional view showing the structure of a firing furnace of a modified example.

FIG. 4 is a vertical sectional view showing a configuration of a first conventional example.

FIG. 5 is a vertical sectional view showing a configuration of a second conventional example.

FIG. 6 is a vertical sectional view showing a configuration of a third conventional example.

FIG. 7 is a vertical sectional view showing a configuration of a fourth conventional example.

[Explanation of symbols]

 2 Furnace core tube 4 Furnace body 4a Furnace body main body 4b Lid body 7A, 7B Heating body 8A, 8B Opposing inner surface

Claims (1)

[Claims] 1. A horizontally elongated furnace core tube (2), a furnace body (4) surrounding the periphery of the furnace core tube (2), and the furnace core (4) disposed in the furnace body (4). Heating element (7A, 7) for heating the tube (2)
B), the furnace body (4) houses the furnace core tube (2) and has a furnace body body (4a) whose upper surface is open, and a lid body (4b) which closes the upper surface. The heating element (7A, 7B) is provided on each of the facing inner side surfaces (8A, 8B) of the furnace body (4a), and at least one heating element (7A, 7B) is The upper side of the furnace body is closer to the other heating body (7B,
7A) is arranged so as to be inclined away from 7A).