JP2002228363A - Hearth roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hearth rollers provided on a roller hearth kiln that are hard to break down. SOLUTION: Each of the hearth rollers 9 provided on the roller hearth kiln 1 for conveying an object (a) to be burned comprises projections for preventing a roller breakdown on an outer circumferential surface of a roller body 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hearth roller for a roller hearth type firing furnace.

[0002]

2. Description of the Related Art A roller hearth type sintering furnace has a structure in which an object to be baked is conveyed by a hearth roller in the sintering furnace, and the hearth roller has conventionally been formed of metal. However, when firing a glass substrate of a liquid crystal display or a plasma display, the firing temperature (strong point) is about 500 to 600 ° C., and the heat-resistant temperature of a metal hearth roller having a temperature of about 400 ° C. is limited. ~
Hearth rollers formed of ceramics that can withstand temperatures of 600 ° C. have become known.

[0003]

When an object to be fired at room temperature is placed on a hearth roller in a heated firing furnace, the object to be fired moves from a contact portion (heat conduction portion) with the hearth roller to the hearth roller. The heat passes through the upper surface of the hearth roller while taking away the heat of the hearth roller. Since such a temperature difference causes damage such as cracks in a ceramic hearth roller, the hearth roller
A configuration for preventing damage is required.

However, the above-mentioned conventional ceramic hearth roller is merely formed in a columnar shape without any irregularities, so there is no structure for preventing breakage, and in a heated baking furnace, the hearth roller at normal temperature is placed on the hearth roller. When a fired product, for example, a glass substrate of a liquid crystal display or a plasma display is placed, the heat of the hearth roller is taken away by the glass substrate, and a local temperature difference occurs in the hearth roller.

[0005] The temperature difference becomes a stress,
Cracks are made in the ceramic hearth roller,
There was a risk that the device could be damaged and could not be rotated.
In such a state, the glass substrate that has been movable in the firing furnace by the hearth roller cannot move in the firing furnace.

Further, in order to operate the firing furnace normally again, once the operation of the firing furnace is stopped, it is waited for the temperature in the firing furnace to decrease over a few days, and the temperature is reduced to such an extent that a person can work. After lowering, the damaged hearth roller must be replaced and the firing furnace must be started again. Thus, when the hearth roller is broken, it takes several days before normal operation is started again, and the efficiency of the firing operation is significantly reduced.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a hearth roller for conveying an object to be fired in a roller hearth type firing furnace, wherein a hearth roller for preventing the roller from being damaged is provided on an outer peripheral surface of a roller body. A hearth roller provided with a plurality of projections is provided.

The present invention also has the following features. (1) The roller main body is substantially cylindrical, and a breakage prevention member having a slit-shaped notch formed in the axial direction is fitted on the inner peripheral surface of the roller main body. (2) To be installed in a roller hearth type firing furnace for a liquid crystal display or a plasma display. (3) The projections make point contact or line contact with the object to be fired.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is directed to a roller hearth type baking furnace in which a plurality of protrusions for preventing roller damage are provided on the outer peripheral surface of a roller body of a hearth roller for transporting an object to be fired. The contact area between the hearth roller and the object to be fired is reduced by the projections.

Therefore, when an object to be fired at room temperature to be fired is placed on the hearth roller in the heated firing furnace, the heat of the hearth roller is removed as much as possible by the object to be fired at room temperature. It is possible to prevent a local temperature difference from occurring in the hearth roller and prevent the hearth roller from being damaged due to the temperature difference.

In particular, when the hearth roller is damaged, it takes time to replace the hearth roller, and it takes time until the firing furnace is operated normally again. Therefore, as described above, the hearth roller that is hardly damaged is efficiently used. A firing operation can be performed.

Further, if the roller main body is formed in a substantially cylindrical shape and a break prevention body is fitted on the inner peripheral surface of the roller main body, the hearth roller can be supported from the inside by the damage prevention body, and the hearth roller can be supported by the damage prevention body. Even if a crack is formed, the hearth roller can be prevented from dropping downward.

[0013] In particular, if a slit-shaped notch is provided in the damage prevention body in parallel to the axial direction, for example, when the damage prevention body is formed of metal, the damage prevention body is heated with the firing furnace. Even if the thermal expansion occurs, the expanded portion of the damage prevention body can escape to the notch, and the damage prevention body can be prevented from thermally expanding outward. Therefore, it is possible to prevent the damage prevention body from being damaged by pressing the hearth roller that contacts the outer peripheral surface of the damage prevention body outward.

When the hearth roller is disposed in a roller hearth type firing furnace for a liquid crystal display or a plasma display, the roller hearth type firing furnace uses a ceramic hearth roller which is easily damaged by a local temperature difference. Particularly effectively, it is possible to prevent the hearth roller from being damaged.

Further, by forming projections projecting from the outer peripheral surface of the roller body of the hearth roller as in the embodiment described below, the effect of preventing the hearth roller from being damaged can be further enhanced, and the material to be fired can be smoothly moved. Can be transported.

[0016]

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

FIG. 1 shows a roller hearth type sintering furnace 1. In a furnace body 2 formed in a substantially rectangular parallelepiped elongated in the left-right lateral direction, an inlet opening 5 is provided in one of left and right side walls 3, 4. At the same time, an outlet opening 6 is provided on the other side, so that the material to be fired a can pass through the furnace in the left-right horizontal direction. Here, the object to be fired a is a glass substrate constituting a liquid crystal display or a plasma display.
Has a muffle structure, and the furnace length is about 10 to 40 m.

Also, inside the furnace body 2, at predetermined intervals,
A number of hearth rollers 9 are provided between the front and rear side walls 7 and 8 of the furnace body 2.
The object to be fired a is placed on the upper part of the hearth rollers 9 and the hearth roller 9 is rotated so that the object to be fired a is opened from the inlet opening 5 of the furnace body 2 to the outlet opening. It can be transported to the section 6.

The hearth roller 9 and the bottom wall 10 of the furnace body 2
An electric heater 11 is provided between the
Using the heat source 11 as a heat source, the inside of the furnace body 2 is heated to a firing temperature of about 500 to 600 ° C. to fire the object to be fired a. In the figure, reference numeral 12 denotes a casing of the furnace body 2.

Here, the roller body of the hearth roller 9
Reference numeral 16 denotes a ceramic formed in a substantially cylindrical shape, having an outer diameter of about 40 mm, a peripheral wall thickness of about 5 mm, and a length of about 1000 m.
m.

On the outer peripheral surface of the roller body 16, a plurality of protrusions for preventing damage to the roller are provided, and the protrusions allow the hearth roller 9 and the object to be fired a to be mounted on the upper part of the hearth roller 9 to be in contact with each other. In order to prevent the heat of the hearth roller 9 from being deprived of the material to be fired a, and to prevent the hearth roller 9 from being cracked due to a local temperature difference. ing.

Although the projections are made of ceramics like the roller body 16 here, the invention is not limited to this, and the projections can be formed using a material having low thermal conductivity.
Further, the outline of the roller body 16 is not limited to the above. Hereinafter, several examples of the shape of the protrusion provided on the outer peripheral surface of the roller body 16 will be described.

(First Embodiment) As shown in FIG. 2, in this embodiment, a plurality of hemispherical projections A1 are provided on the outer peripheral surface of the roller body 16 of the hearth roller 9, and the hemispherical projections are provided.
A1 supports the object to be fired a placed on the hearth roller 9. Therefore, the hearth roller 9 and the object to be fired a can be brought into point contact, and the contact area between them can be reduced to prevent the hearth roller 9 from being damaged.

Also, by forming the hemispherical projection A1,
The object to be fired a can be smoothly contacted, and the object to be fired a can be transported while being smoothly fed out.

In FIG. 2, the hemispherical projections A1 are arranged on the outer peripheral surface of the roller body 16 at predetermined intervals, and
The contact portion between the workpiece and the object to be fired a is not biased, so that the object to be fired a can be stably supported and the heat of the hearth roller 9 is not locally deprived. The protrusions A1 may be randomly arranged on the outer peripheral surface of the roller body 16.

(Second Embodiment) As shown in FIG. 3, in this embodiment, flanges A2 are formed on the outer peripheral surface of the roller body 16 of the hearth roller 9 at predetermined intervals. The to-be-burned object a mounted on the upper part of the hearth roller 9 is supported by the flange-shaped projection A2. Therefore, the hearth roller 9 and the object to be fired a can be brought into point contact, and the contact area between them can be reduced to prevent the hearth roller 9 from being damaged.

Further, since the flange-shaped projection A2 can always support the object to be fired a in a constant state even when the hearth roller 9 rotates, the object to be fired a can be stably conveyed, and Since the object to be fired a can be smoothly contacted with the object a, the object to be fired a can be transported while being smoothly fed out.

(Third Embodiment) As shown in FIG. 4, in the present embodiment, a semi-disc-shaped projection is formed on the outer peripheral surface of the roller body 16 of the hearth roller 9 perpendicularly to the axial direction of the hearth roller 9.
A plurality of projections A3 are provided, and the object to be fired a placed on the upper part of the hearth roller 9 is supported by the same semi-circular projection A3.

Accordingly, the hearth roller 9 and the object to be fired a can be brought into point contact, and the contact area between them can be reduced to prevent the hearth roller 9 from being damaged.
The semi-disc-shaped projection A3 and the object to be fired a can be brought into smooth contact with each other, and the object to be fired a can be transported while being smoothly fed out.

In addition, in the embodiment shown in FIG. 4, a configuration in which semi-disc-shaped projections A3 are projected radially on the same outer circumferential circle of the roller body 16 is provided at predetermined intervals in the axial direction of the hearth roller 9. In addition, the semi-circular disk-shaped projections A3 which are arranged back and forth in the axial direction of the hearth roller 9 are arranged so as to be shifted so as not to overlap as much as possible.

Therefore, the contact portion between the hearth roller 9 and the object to be fired a can be dispersed, the object to be fired a can be stably supported, and the heat of the hearth roller 9 is locally removed. Can be prevented.

The semi-disc-shaped projection A3 is
May be provided on the outer peripheral surface of the roller body 16 in parallel with the axial direction of the hearth roller 9.
A3s are staggered so as not to be unevenly distributed,
It is preferable to disperse the contact portion between the hearth roller 9 and the object to be fired a.

(Fourth Embodiment) As shown in FIG. 5, in this embodiment, a protrusion A4 formed in a rib shape parallel to the axial direction of the hearth roller 9 is formed on the outer peripheral surface of the roller body 16 of the hearth roller 9.
The rib-shaped protrusion A4 is provided on the roller body 16.
Are radially arranged on the outer peripheral surface of the lens and have a substantially triangular prism shape.

The hearth roller 9 is formed by the rib-shaped projection A4.
Since the object to be fired a to be placed on the upper surface is supported, the hearth roller 9 and the object to be fired a can be brought into line contact with each other, and the contact area between them can be reduced to reduce the hearth roller 9.
Can be prevented from being damaged.

In particular, by forming the rib-shaped projections A4 in a substantially triangular prism shape, the object a to be fired can be supported by the apex corners 13 of the triangular prism shape, and the hearth roller 9 and the object a to be fired a
The contact area with the hearth roller 9 can be reduced as much as possible to enhance the effect of preventing the hearth roller 9 from being damaged.

In the embodiment shown in FIG.
A4 is continuously projected from one end of the roller body 16 to the other end, but a cutout portion is provided at one or a plurality of positions of the rib-shaped projection A4, and the rib-shaped projection A4 is discontinuously projected. Can also.

(Fifth Embodiment) As shown in FIG. 6, in this embodiment, a rib A4 formed on the outer peripheral surface of the roller body 16 of the hearth roller 9 is formed in a rib shape parallel to the axial direction of the hearth roller 9.
The rib-shaped protrusion A4 is provided on the roller body 16.
Are radially arranged on the outer peripheral surface of the lens and have a substantially semi-cylindrical shape.

As in the case of the fourth embodiment, the object to be fired a placed on the upper part of the hearth roller 9 is supported by the rib-like projections A5, so that the hearth roller 9 and the object to be fired a are lined. The hearth roller 9 can be brought into contact with each other, and the contact area between them can be reduced to prevent the hearth roller 9 from being damaged.

Particularly, by forming the rib-like projections A5 into a substantially semi-cylindrical shape, the rib-like projections A5 can be brought into smooth contact with the object to be fired a, and the object to be fired a can be smoothly fed out. Can be transported.

Incidentally, in the embodiment shown in FIG.
A5 protrudes continuously from one end of the roller body 16 to the other end. As in the fourth embodiment, a cutout is provided at one or a plurality of positions of the rib-like protrusion A5, and the rib-like protrusion is formed. A5 can also be protruded discontinuously.

In addition to the protrusions A1, A2, A3, A4, and A5 on the outer peripheral surface of the hearth roller 9 described above, as shown in FIG. Can be removably fitted with a metal break prevention member 14 having a C-shaped cross-section by notching in a slit shape in the axial direction, and the breakage prevention member 14 can also prevent the hearth roller 9 from being damaged.

That is, when the hearth roller 9 is broken, a crack is formed substantially perpendicularly to the axial direction of the hearth roller 9, and the hearth roller 9 is broken so as to fall down around the cracked portion. By supporting the hearth roller 9 from the inside by 14, it is possible to prevent the hearth roller 9 from falling down even if the hearth roller 9 is cracked.

The notch 15 provided in the breakage preventive body 14 is for releasing the thermal expansion of the metal breakage preventive body 14. For example, the SUS breakage preventive body 14 is used for heating the firing furnace 1. In the event of thermal expansion accompanying the damage, the notch 15 has
The expansion portion can be released, and the damage prevention body 14 can be prevented from thermally expanding outward. Therefore, the damage prevention member 14 does not press the ceramic hearth roller 9 in contact with the outer peripheral surface of the damage prevention member 14 in the outward direction to damage the hearth roller 9.

[0044]

According to the first aspect of the present invention, in the hearth roller for transporting an object to be fired in a roller hearth type firing furnace, a projection for preventing roller damage is provided on the outer peripheral surface of the roller body. With the same projection for preventing damage,
The contact area between the hearth roller and the object to be fired is reduced. Of the hearth roller can be prevented as much as possible, and a local temperature difference can be prevented from occurring in the hearth roller, thereby preventing the hearth roller from being damaged due to the temperature difference. In particular, when the hearth roller is damaged, it takes time to replace the hearth roller, and it takes time until the firing furnace is operated normally again. It can be carried out.

According to the second aspect of the present invention, the roller main body is made substantially cylindrical, and a breakage prevention member having a slit-shaped notch formed in the axial direction is fitted on the inner peripheral surface of the roller main body. Thus, the hearth roller can be supported from the inside by the damage prevention body, and even if the hearth roller is cracked, the hearth roller can be prevented from dropping downward. In particular, since the notch is provided in the damage prevention body, for example, when the damage prevention body is made of metal,
Even if the breakage preventive body thermally expands due to the heating of the firing furnace, the expanded portion of the breakage preventive body can escape to the cutout portion, and the breakage preventive body can be prevented from thermally expanding outward. . Therefore, it is possible to prevent the damage prevention body from being damaged by pressing the hearth roller contacting the outer peripheral surface of the damage prevention body outward.

According to the third aspect of the present invention, by disposing in a roller hearth type firing furnace for a liquid crystal display or a plasma display, the roller hearth type firing furnace is easily damaged by a local temperature difference. Since the hearth roller made of ceramics is used, breakage of the hearth roller can be particularly effectively prevented.

According to the fourth aspect of the present invention, the point of contact between the projection and the object to be fired can reduce the contact area between the two and prevent the hearth roller from being damaged.

According to the fifth aspect of the present invention, by bringing the projection and the object to be fired into line contact, the contact area between the two can be reduced, and damage to the hearth roller can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a roller hearth type firing furnace.

FIG. 2 is a perspective view of a hearth roller according to the present invention.

FIG. 3 is a perspective view of another embodiment.

FIG. 4 is a perspective view of another embodiment.

FIG. 5 is a perspective view of another embodiment.

FIG. 6 is a perspective view of another embodiment.

FIG. 7 is an explanatory view of a damage prevention body.

[Explanation of symbols]

 A1 Hemispherical projection A2 Flange-shaped projection A3 Semi-disc-shaped projection A4, A5 Rib-shaped projection

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F033 GA06 GB06 GB08 GC08 GD07 4K050 AA04 BA07 BA16 CF06 CF16 CG05 4K055 AA06 HA01 HA11 HA16

Claims (5)

[Claims] 1. An object to be fired in a roller hearth type firing furnace (1)
(a) A hearth roller (9) for conveyance, wherein the roller body (1)
6) A hearth roller characterized in that a plurality of protrusions are provided on the outer peripheral surface for preventing roller damage. 2. A roller body (16) having a substantially cylindrical shape, and a breakage prevention member (14) having a slit-shaped notch (15) formed in the axial direction is fitted on the inner peripheral surface of the roller body (16). The hearth roller according to claim 1, wherein the hearth roller is mounted. 3. The hearth roller according to claim 1, wherein the hearth roller is provided in a roller hearth type baking furnace for a liquid crystal display or a plasma display. 4. The hearth roller according to claim 1, wherein the projection makes point contact with the object to be fired (a). 5. The hearth roller according to claim 1, wherein the projection is in line contact with the object to be fired (a).