JP2004275888A - Drying furnace for coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drying furnace which suppresses the enlargement of a facility and the occurrence of troubles, such as a coating failure. <P>SOLUTION: The drying furnace comprises a radiational heating zone 4 having a tunnel-shaped furnace body 11 and a pair of infrared radiant panels 12 arranged at the both sides of a car body 2 in its transfer direction in the furnace body 11. The infrared radiant panels 12 have the parts that correspond to rockers formed on the lower sides of the car body 2, and irregular parts 31 are formed on the parts corresponding to the rockers, respectively. Though a temperature increase on the parts corresponding to the rockers tends to be relatively slow, the surface area of the parts is increased relatively compared to the other parts due to the presence of the irregular parts 31, and a temperature increase on the parts become easier. Hence, a uniform temperature grow on the car body 2 is achieved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drying furnace for coating, and more particularly to a drying furnace for coating for drying a coating surface of an automobile body or the like in a furnace main body.
[0002]
[Prior art]
When an automobile body or the like is painted, it is then guided to a drying oven for drying the painted surface. That is, the drying oven includes a tunnel-shaped oven main body, and a painted automobile body in the oven main body is, for example, continuously transferred by a conveyor. During this transfer, the painted surface is heated and dried by blowing hot air or the like.
[0003]
2. Description of the Related Art Conventionally, there has been known a technique in which a radiant panel is provided in a furnace main body in order to impart radiant heat to both side walls of an automobile body to be transferred in addition to blowing hot air (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP 10-34051 A
[Problems to be solved by the invention]
However, conventional radiant panels are merely flat or curved along the side wall of the furnace body. For this reason, the heating energy density tends to be constant at any part. That is, the radiation panel surface may be heated evenly. Here, for example, in a portion corresponding to the rocker portion in the automobile body, the temperature rise tends to be relatively slow. If the drying is performed in accordance with the temperature rise of the portion, the temperature rise in the upper part of the vehicle body in the above-described conventional technology becomes excessive, and a coating defect called overbaking occurs. There is a risk. Further, if the portion corresponding to the locker portion is to be sufficiently dried, the oven main body becomes long, which may lead to an increase in the size of the entire drying oven.
[0006]
Accordingly, it is a technical object of the present invention to provide a coating drying oven that can suppress an increase in size of equipment and can suppress occurrence of a defect such as a coating defect.
[0007]
Means for Solving the Problems and Effects of the Invention
Hereinafter, each means suitable for solving the above-mentioned problems and the like will be described in terms of items. In addition, an operation and effect specific to the corresponding means will be added as necessary.
[0008]
Means 1. A drying furnace for coating comprising a radiant panel for drying a coated surface of a work inside a furnace body,
A drying furnace for coating, characterized in that at least a part of the radiant panel is provided with an uneven portion for increasing a surface area.
[0009]
According to the means 1, the painted surface of the work is dried by radiant heat radiated from the radiant panel. At least a part of the radiant panel is provided with an uneven portion, and the presence of the uneven portion increases the surface area of the portion. Therefore, the temperature of the surface portion of the work corresponding to the portion can be easily increased. Therefore, the temperature rise can be homogenized by providing the uneven portion corresponding to a portion where the temperature is relatively hard to rise on the surface of the work. As a result, even when all parts are to be dried, it is possible to prevent the occurrence of coating defects such as overbaking. In addition, it is possible to prevent the furnace main body, and hence the entire drying furnace, from being enlarged.
[0010]
Means 2. A drying furnace for painting comprising a radiant panel for drying a painted surface of a car body to be transferred inside a furnace body,
A drying oven for painting, wherein a concave / convex portion for increasing a surface area is provided in a portion of the radiant panel corresponding to a locker portion in the automobile body.
[0011]
According to the means 2, the painted surface of the automobile body is dried by radiant heat radiated from the radiant panel. At least a part of the radiant panel is provided with an uneven portion, and the presence of the uneven portion increases the surface area of the portion. For this reason, the temperature of the surface portion of the rocker portion corresponding to the portion can be easily increased. Therefore, by providing the uneven portion corresponding to the rocker portion where the temperature is relatively hard to rise on the surface of the automobile body, the temperature rise can be made uniform. As a result, even when all parts are to be dried, it is possible to prevent the occurrence of coating defects such as overbaking. In addition, it is possible to prevent the furnace main body, and hence the entire drying furnace, from being enlarged.
[0012]
Means 3. The coating drying furnace according to claim 2, wherein the unevenness balances the temperature rise between the rocker portion and other portions.
[0013]
According to the means 3, harmonization of temperature rise between the rocker portion and other portions is achieved by the uneven portion. That is, the unevenness is provided at an appropriate position and at an appropriate degree, so that a uniform temperature rise of the vehicle body can be ensured. As a result, the above-described effects are more reliably achieved.
[0014]
Means 4. 4. The drying oven for coating according to the means 2 or 3, wherein the radiant panel is provided as a side wall of a hot air drying zone for blowing hot air onto a painted surface of the automobile body to dry the radiant panel.
[0015]
According to the means 4, when the painted surface of the automobile body is blown with hot air to be dried, the above-mentioned effect is obtained.
[0016]
Means 5. The drying oven for coating according to claim 2 or 3, wherein the radiant panel is provided as a side wall of an infrared drying zone for radiating infrared rays and drying the coating surface of the automobile body. .
[0017]
According to the means 5, when the infrared ray is radiated to the painted surface of the automobile body to dry the same, the above-mentioned effect is obtained.
[0018]
Means 6. In the drying oven for coating according to any one of the means 1 to 5, at least one of the density, the shape, and the size of the uneven portion differs depending on the part of the car body to be transferred.
[0019]
Means 7. In the drying oven for coating according to any one of the means 1 to 6, the uneven portion is formed integrally with another portion. In this case, processing and the like can be performed relatively easily in providing the uneven portion, and an increase in cost and the like can be suppressed.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment will be described with reference to the drawings.
[0021]
FIG. 1 is a schematic side view showing a schematic configuration of a coating drying furnace 1 in the present embodiment. As shown in the figure, in the present embodiment, while the automobile body 2 as a work having undergone the painting process is continuously transferred by the conveyor 3 (see FIG. 2 and the like), the vehicle body 2 is moved toward the entrance of the drying oven 1 for painting. And is led out from the exit. In addition, the coating drying furnace 1 in the present embodiment includes a radiant heating zone 4 on the front side and a convection heating zone 5 on the rear side.
[0022]
As shown in FIG. 2, the radiant heating zone 4 includes a tunnel-shaped furnace body 11 and a pair of radiant panels provided on both sides of the furnace body 11 along the transfer direction of the automobile body 2 (conveyor 3). And an infrared radiation panel 12. As the name implies, each infrared radiation panel 12 is configured to be able to emit infrared rays inward. Then, when the automobile body 2 that has passed through the coating process passes through the radiation heating zone 4, the solvent component contained in the coating film is mainly evaporated.
[0023]
As shown in FIG. 6, the convection heating zone 5 includes a tunnel-shaped furnace body 21 and a pair of two-sided members provided on both sides of the furnace body 21 along the transfer direction of the automobile body 2 (the conveyor 3). A hot air supply duct 22 and an exhaust duct 23 provided above the hot air supply duct 22 are provided.
[0024]
Air heated by a not-shown heat source (for example, a burner) is supplied to the hot-air supply duct 22 by a not-shown fan. A plurality of outlets 25 are provided on the inner wall 24 of the hot air supply duct 22 so as to face the automobile body 2. Therefore, the supplied heated air becomes hot air and is blown from the outlet 25 onto the coating surface, whereby the coating film is baked and dried. The inner wall 24 corresponds to a radiant panel in the convection heating zone 5 of the present embodiment.
[0025]
The exhaust duct 23 is communicated with a suction mechanism (not shown), and a plurality of outlets 27 are provided on an inner wall 26 thereof. From the exhaust port 27, contaminated air containing a solvent component generated in the furnace main body 21 is discharged.
[0026]
Next, a characteristic portion of the present embodiment will be described.
[0027]
As shown in FIGS. 2, 3, and 4, the infrared radiation panel 12 of the radiation heating zone 4 has an uneven portion 31 at a lower portion of the vehicle body 2, a portion corresponding to a rocker portion. . The concavo-convex portion 31 in the present embodiment is formed in a mountain-valley shape (zigzag shape) in cross section, and such a configuration is intended to increase the surface area at the site. The uneven portion 31 is provided over substantially the entire length of the radiation heating zone 4.
[0028]
As shown in FIGS. 6 and 7, the inner wall 24 of the hot air supply duct 22 of the convection heating zone 5 is provided with an uneven portion 32 at a portion corresponding to the locker portion of the automobile body 2. The concavo-convex portion 32 is also formed in a mountain-valley shape in cross section, and such a configuration is intended to increase the surface area at the site. The uneven portion 32 is provided over substantially the entire length of the convection heating zone 5.
[0029]
Next, the operation and effect of the present embodiment configured as described above will be described.
[0030]
The vehicle body 2 is guided from the entrance of the coating drying furnace 1 to the radiant heating zone 4 first while being continuously transferred by the conveyor 3. In the radiant heating zone 4, heating and drying are performed by infrared rays radiated from the pair of infrared radiant panels 12. At this time, for example, in the portion of the automobile body 2 shown in FIG. 5 corresponding to the rocker portion (the portion with the stitch pattern in the drawing), the temperature rise tends to be relatively slow. In this regard, the infrared radiation panel 12 of the present embodiment is provided with the uneven portion 31 at a portion corresponding to the rocker portion. Then, due to the presence of the uneven portion 31, the surface area of the portion is increased compared to other portions. For this reason, the temperature of the surface portion of the rocker portion corresponding to the portion can be easily increased. Therefore, the temperature rise can be made uniform by providing the uneven portion 31 corresponding to the rocker portion where the temperature is relatively hard to rise. In particular, uniform drying can be achieved by appropriately setting the size, shape, density, and the like of the uneven portion 31. As a result, it is possible to prevent such a coating defect from occurring, unlike the related art in which the upper portion tends to be overbaked so as to dry all the portions. Further, since it is not necessary to increase the length of the furnace main body in order to make the drying sufficient, it is also possible to prevent the entire coating drying furnace 1 from being enlarged.
[0031]
Further, in the present embodiment, the automobile body 2 having passed through the radiant heating zone 4 is guided to the convection heating zone 5 next. In the convection heating zone 5, the coating film is baked and dried by blowing heated air onto the painted surface. Moreover, since the radiant heat from the inner wall 24 is transmitted to the vehicle body 2 as well as the hot air blown in this way, the radiant heat promotes drying.
[0032]
In this case as well, the uneven portion 32 is provided in a portion of the automobile body 2 corresponding to, for example, the locker portion, and the surface area of the portion is larger than other portions. Therefore, the density of the radiant heat radiated from the inner wall 24 is higher at the portion corresponding to the rocker portion than at other portions, and heating of the portion is easily promoted. Accordingly, by providing the uneven portion 32 corresponding to the rocker portion where the temperature is relatively unlikely to rise, the temperature rise can be made uniform even in the convection heating zone 5. In particular, uniform drying can be achieved by appropriately setting the size, shape, density, and the like of the uneven portion 32. As a result, it is possible to achieve the same effect as above, that is, to prevent the occurrence of coating defects and to prevent the entire coating drying furnace 1 from being enlarged.
[0033]
Note that the present invention is not limited to the content described in the above embodiment, and may be implemented as follows, for example. Of course, other application examples and modifications not illustrated below are naturally possible.
[0034]
(A) In the above-described embodiment, the concave and convex portions 31 and 32 having a cross-sectional valley shape are illustrated. In short, any cross-sectional shape may be used as long as the configuration can increase the surface area. Therefore, for example, as shown in FIG. 8A, the uneven portion 33 having a sectional waveform (curved shape) may be employed, or as shown in FIGS. May be provided in plurality.
[0035]
(B) In the above embodiment, the case where the uneven portions 31 and 32 are provided in the radiant heating zone 4 and the convective heating zone 5, respectively, is specifically embodied. Good.
[0036]
(C) Further, it is not always necessary to provide almost all of the uneven portions 31 and 32 along the longitudinal direction of each zone, and they may be provided only in a predetermined section.
[0037]
(D) In the above-described embodiment, the coating drying furnace 1 including the radiant heating zone 4 and the convection heating zone 5 is embodied. However, the present invention can be embodied as a drying furnace including only one of the zones. Of course, the embodiment may be embodied in a drying furnace having another zone, or may be embodied in a heating furnace in the reverse order.
[0038]
(E) An uneven portion may be provided corresponding to another portion other than the locker portion.
[0039]
(F) In the above embodiment, the work to be dried is embodied in the automobile body 2, but may be applied to the case where the coating of another work is dried.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing a schematic configuration of a drying oven for coating in one embodiment.
FIG. 2 is a rear view showing a schematic configuration of a radiation heating zone.
FIG. 3 is a perspective view schematically showing a radiant heat panel.
FIG. 4 is a cross-sectional view showing an uneven portion.
FIG. 5 is a side view showing an automobile body.
FIG. 6 is a front view showing a schematic configuration of a convection heating zone.
FIG. 7 is a perspective view schematically showing an inner wall of a hot air supply duct.
8A is a cross-sectional view illustrating an uneven portion according to another embodiment, FIG. 8B is a partial side view illustrating the uneven portion according to another embodiment, and FIG. FIG. 7 is a sectional view taken along line JJ of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Drying furnace for coating, 2 ... Car body as a work, 3 ... Conveyor, 4 ... Radiant heating zone, 11 ... Furnace main body, 12 ... Infrared radiation panel constituting radiant panel, 21 ... Furnace main body, 22 ... Hot air supply Duct, 24 ... Inner wall constituting radiant panel, 31, 32, 33, 34 ... Uneven portion.

Claims (5)

A drying furnace for coating comprising a radiant panel for drying a coated surface of a work inside a furnace body,
A drying furnace for coating, characterized in that at least a part of the radiant panel is provided with an uneven portion for increasing a surface area. A drying furnace for painting comprising a radiant panel for drying a painted surface of a car body to be transferred inside a furnace body,
A drying oven for painting, wherein a concave / convex portion for increasing a surface area is provided in a portion of the radiant panel corresponding to a locker portion in the automobile body. The drying oven for coating according to claim 2, wherein a temperature rise between the rocker portion and other portions is balanced by the uneven portion. 4. The drying oven for coating according to claim 2, wherein the radiant panel is provided as a side wall of a hot-air drying zone for blowing hot air onto a painted surface of the automobile body to dry the radiant panel. 5. 4. The coating dryer according to claim 2, wherein the radiant panel is provided as a side wall of an infrared drying zone for radiating infrared rays and drying the coating surface of the automobile body. 5. Furnace.

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