JP3261437B2 - Roller hearth furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fired product or a fired product placed on a base plate (hereinafter referred to as a fired product) in which a number of ceramic rollers are arranged side by side in a firing chamber. ) While being transported.

[0002]

2. Description of the Related Art In a roller hearth furnace, there are various modes in which articles to be fired are conveyed in a single row or conveyed in a plurality of rows of two or more rows. Also,
As a method of taking out the product to be fired coming out of the outlet of the furnace, an automated method of transferring the product to be fired to another processing step by a mechanical device other than by a person has been adopted. In order to process a product to be fired by this automated apparatus, the position of the product to be fired coming out of the outlet of the furnace needs to be in a state in which it is not inclined in a plane or in a three-dimensional manner. In particular, in the case where articles to be fired are transported in two or more rows, if the inclination of the attitude of the articles to be fired adjacent to the left and right is large, it becomes difficult to handle the articles by the automatic device. On the other hand, as a roller for transporting the article to be fired in the furnace, a ceramic roller is used because a metal roller cannot be used in terms of heat resistance. Generally, the accuracy of the outer diameter of this ceramic roller is not as precise as that of a metal roller, and the outer diameter of each roller differs at the axial position of each roller. In addition, the roller bends due to the transport operation and the change with time in a high temperature, and the bending of the central portion of the normal roller in the axial direction gradually increases. Due to the difference in the outer diameter and the deflection of the rollers, the object to be fired usually tilts in a plane while being conveyed in the furnace.
FIGS. 9 and 10 are diagrams schematically showing the attitude of the object to be fired on a plane when the object to be fired is transported from the furnace inlet to the furnace outlet by the conventional apparatus. FIG. In this case, the article 2 to be fired coming out of the furnace outlet is inclined to one side in a plane. FIG. 10 shows the case of two-row conveyance, in which the right and left adjacent products 2a and 2b coming out of the furnace outlet are open at their mutual front ends. In the case of conveying two or more rows as described above, since the deflection of the roller is greatest at the center, the front ends of the articles to be fired adjacent to the left and right are usually opened, and no three-dimensional inclination occurs, but the plane is flat. Target inclination usually occurs considerably. This phenomenon hinders the removal of the article to be fired at the outlet of the furnace by an automatic device, and if the degree is large, it becomes difficult to handle the article to be fired. Therefore, in the prior art, in order to correct the planar inclination of the article to be fired while being conveyed in the furnace, a method of increasing the position of one of the rollers in one of the rollers as shown in FIG.
As shown in FIG. 12, a method of shifting both ends of the rollers in the front-rear direction in some of the rollers in the roller group has been adopted.

[0003]

However, these conventional techniques have the following disadvantages. That is, it is possible to change the direction of the article to be fired by raising the position of one side of the roller or shifting the both ends of the roller in the front-back direction. When the front ends of the adjacent objects to be fired are open, the left and right adjacent objects to be fired change their orientations in the same state, and there is a disadvantage that the opening of the front ends cannot be eliminated.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional disadvantages. For example, as shown in FIG. In one or both sides, one or more rollers (inclination correcting rollers) 4 each having a portion larger than the diameter of a normal roller and the remaining portion having the diameter of a normal roller are provided. The configuration is such that one side of the article to be baked 2 is conveyed while being inclined on a portion larger than the diameter of a normal roller, so that the planar inclination of the articles to be baked 2a, 2b is corrected.

[0005]

The principle of operation of the article to be fired 2 by the inclination correcting roller 4 will be described with reference to FIGS. 4, 5 and 6. FIG. FIG. 4 is a diagram showing the relationship between the inclination correcting roller 4 and the article 2 at the stage when the article 2 is started to be conveyed by the inclination correcting roller 4. FIG. 5 shows the relationship between the inclination correcting roller 4 and the article 2 at the stage when the conveyance of the article 2 by the inclination correcting roller 4 is completed. FIG. 6 shows a front view of FIG. In FIG. 4, if the diameter of the thin portion of the inclination correcting roller 4 is D, which is the same as the diameter of a normal roller, and the diameter of the thick portion of the roller is (D + Δ), the outer circumference of the roller when the inclination correcting roller makes one rotation is determined. The moving distance is πD for the thin roller and π (D + Δ) for the thick roller. If the slip between the baked articles 2 is conveyed by the rotation of the tilt correction roller 4, the transport distance of the baked article 2 when the tilt correction roller 4 makes one rotation is equal to the distance of the tilt correction roller 4. Since it is equal to the moving distance of the outer circumference, the transport distances of the thin roller and the thick roller are πD and π (D + Δ), respectively. Assuming that the length of the object to be fired 2 in the traveling direction is L, when the object to be fired 2 is transported from the front end to the rear end by a thick roller, the inclination correction roller 4 is L / π.
(D + Δ) rotation. The inclination correcting roller 4 is L / π (D +
Δ) When rotated, the transport distance of the thin portion by the roller is πDL / π (D + Δ) = DL / (D + Δ) = ｛1−Δ /
(D + Δ)｝ L. Therefore, when the to-be-baked article 2 having the length L is conveyed from the front end to the rear end by the thick roller, the conveying distance by the thin roller is ｛1−Δ / (D +
Δ) Since｝ L, the thicker roller is L- ｛1-
Δ / (D + Δ)｝ L = LΔ / (D + Δ) will be transported more. In FIG. 6, assuming that the distance between the position where the object 2 and the thin and thick parts come into contact is R, the object 2 is θ (θ 焼 成 tan ⁻¹ ｛LΔ) due to the difference in the transport distance.
/ (D + Δ) R｝). This inclination angle θ is the diameter L of the thick part (D +
The inclination angle θ can be arbitrarily changed by setting Δ) and the contact distance R between the workpiece 2 and the inclination correcting roller 4. The inclination angle θ is the inclination correction roller 4 under the same conditions as above.
The inclination angle can also be increased by continuously installing. That is, the degree of inclination correction of the article 2 to be fired is determined by the diameter (D + Δ) of the thick portion of the inclination correction roller 4, the contact distance R between the article 2 to be fired and the inclination correction roller 4, and the number of continuously installed inclination correction rollers. And inclination correction roller 4
Can be arbitrarily changed by setting the installation interval arbitrarily. As described above, according to the present invention, the workpiece 2 is actually transported from the inlet to the outlet of the furnace, and the degree of planar inclination of the workpiece 2 generated by transporting the rollers 3 having a normal diameter is determined. A roller 3 having a diameter larger than the diameter of the normal diameter roller 3 in the group of rollers 3 having a diameter larger than the diameter of the roller 3 comes out from the outlet of the furnace by appropriately arranging according to the degree of the plane inclination. The effect that the planar inclination of the article to be fired 2 can be eliminated is obtained.

[0006]

Embodiments of the present invention will be described below. FIG.
At the upper and lower intermediate positions of the furnace wall of the roller hearth furnace body 1, a large number of ceramic rollers 3 are arranged side by side in the direction of transport of the article 2 to be fired. The connecting portion 5 supported in a state, and one end of which is supported by the bearing portion 6
, The rotation of a rotary drive unit 9 driven by a drive source (not shown) is transmitted, and the rotation of the rollers 3 causes the article to be fired 2 placed on the rollers to be conveyed while being fired by a heating element (not shown). It has become. FIG. 1 shows an embodiment of a roller hearth furnace according to the present invention, and shows a case of two-row conveyance. Roller 3 having a normal diameter is transferred to product 2
2 are arranged side by side in the conveying direction of the roller, and a roller 3 having a normal diameter as shown in the front view of FIG.
Correction roller 4 having a diameter portion larger than the diameter of
Are arranged at certain intervals. In an embodiment according to the present invention shown in FIG. 2, the diameter of the central portion of the inclination correcting roller 4 is the same as the diameter of the normal diameter roller 3 shown in FIG. The diameter of the portion to be formed is slightly larger than the diameter of the roller 3 having the normal diameter. Because of the structure described above, the transport distance on the outer side, that is, on the side where the diameter of the roller is larger, is greater than the transport distance on the inner side according to the principle described in the section of the operation.
As shown in the figure, the article to be fired 2 whose front ends are mutually open
While the rollers a and 2b are conveyed from the front end to the rear end by the inclination correcting roller 4, the front end is closed. In the description of the operation, the slip between the inclination correcting roller 4 and the article to be fired 2 is neglected. However, in the explanatory view of the operation, FIGS. Roller 3 of diameter
Alternatively, since the inclination correcting roller 4 exists, a slip occurs between the inclination correcting roller 4 and the article 2 to be fired, and the actual inclination correcting angle is slightly different from the calculation formula described in the section of the operation. However, the actual inclination correction angle can be easily obtained by an experiment. In one embodiment according to the present invention, the length of the article to be fired is L = 300 mm, the diameter of the normal roller is D = 35 mm, and the diameter of the portion larger than the normal roller diameter is D + Δ = 36.5 mm (Δ = 1.5 mm). ), When the contact distance between the object to be fired and the inclination correcting roller is R = 250 mm, the inclination correction angle of the object to be fired at that position is 1.
5 °. In the embodiment shown in FIG. 1, two inclination correcting rollers 4 are arranged in a furnace, and the right and left adjacent workpieces 2 at a position immediately before the setting position of the inclination correcting rollers 4 are set.
When the opening angle α of the front ends of a and 2b was examined, it was 3 °. If the inclination was corrected by 1.5 ° for each of the products 2a and 2b to be fired, the opening angle α would be 0 °. The result of setting the diameter D + Δ of the thick portion of the inclination correcting roller 4 and the contact distance R between the inclination correcting roller 4 and the article 2 to be baked so that the angle is 1.5 ° is the specification of the inclination correcting roller. In this embodiment, D = 35 mm, D + Δ = 36.5 m
By arranging the inclination correcting rollers 4 having specifications of m and R = 250 mm at two fixed intervals in the furnace, the planar inclination of the article 2 to be fired coming out of the furnace outlet can be made zero. Was. FIG. 7 shows another embodiment according to the present invention. In the case where the article 2 to be fired is conveyed in one row, the portion where the deflection of the roller is the largest is displaced to one side from the conveyance center due to space or the like. By providing a portion on one side of the roller with a diameter larger than the diameter of a normal roller,
The inclination of the article to be fired 2 is corrected. The portion of the inclination correcting roller 4 having a diameter larger than the normal diameter is
In this embodiment, the roller hearth furnace is continuous to the outside of the furnace body 1. However, if the portion on which the article to be fired 2 is placed has the above diameter, the same effect as described above can be obtained. Good. Further, the cross-sectional shape of the portion of the inclination correcting roller 4 having a diameter larger than the diameter of the normal roller is not necessarily required to be circular, but may be an arbitrary shape as shown in FIG. If the rotation locus of the contact portion with the article to be fired has a diameter larger than the diameter of a normal roller, the same effect as described above can be obtained. The diameter of the portion other than the large diameter portion of the inclination correcting roller 4 is
It does not necessarily have to be the same as the diameter of a normal roller,
If the diameter is smaller than the large diameter portion, the same effect as described above can be obtained.

[0007]

As described above, according to the present invention, the inclination correcting roller for correcting the inclination of the object to be fired having a larger diameter portion than the normal diameter roller is included in the roller group including the normal diameter rollers. By arranging at a certain interval from the furnace entrance to the furnace exit, the planar inclination of the object to be fired coming out of the furnace outlet can be made zero, so other processing steps of the object to be fired after the furnace outlet Thus, there is an effect that the object to be fired can be easily handled by an automated device such as automatic transfer by a mechanical device to the device, and the reliability of the handling operation can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment according to the present invention.

FIG. 2 is a front view of one embodiment according to the present invention.

FIG. 3 is an explanatory diagram of a driving unit of a roller.

FIG. 4 is an illustration of the principle of operation according to the present invention.

FIG. 5 is an illustration of the principle of operation according to the present invention.

FIG. 6 is a front view of FIG. 4;

FIG. 7 is a plan view showing another embodiment according to the present invention.

FIG. 8 is a diagram showing another cross-sectional shape of the roller according to the present invention.

FIG. 9 is an explanatory view of a state of conveyance of a product to be fired according to a conventional technique.

FIG. 10 is an explanatory view of a state of transporting a product to be fired according to a conventional technique.

FIG. 11 is a diagram showing a conventional technique.

FIG. 12 is a diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 2 Article to be fired (base plate) 3 Roller 4 Tilt correcting roller 5 Connecting part 6 Bearing part 7 Support roller 8 Support frame 9 Rotation drive part

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F27B 9/24 C21D 1/00 115 B65G 39/07 B65H 5/06

Claims (1)

(57) [Claims] 1. A roller hearth furnace in which a large number of ceramic rollers are arranged in a firing chamber in a conveying direction of an object to be fired, and the rollers are used to convey the object to be fired in one or two rows while firing. Among the normal rollers arranged side by side in the conveying direction, one or both sides are provided with a portion larger than the diameter of the normal roller, and the remaining portion is provided with one or more rollers having the diameter of the normal roller. A roller hearth furnace characterized in that one side of the article to be fired is transported while being inclined while being placed on a portion larger than the diameter of a normal roller.