JP2505377Y2 - Paint drying oven - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a coating drying furnace for heating and drying a coated object, and more specifically, a temperature raising zone for raising the temperature of the coated object conveyed to a predetermined temperature, Following this, the inside of the furnace body is divided into a constant temperature zone for holding the coated object at a constant temperature, and in the temperature rising zone, main heating means are provided on both side wall parts, and below the coated object passage path. The present invention relates to a coating drying furnace in which auxiliary heating means is provided and main heating means is provided on both side wall portions in the constant temperature zone.

[Conventional technology]

FIG. 3 shows a conventional coating and drying furnace, and the inside of the furnace body 20 is
It is divided into a temperature raising zone 21 for raising the temperature of the coating material A conveyed in the furnace to a predetermined temperature and a constant temperature zone 22 for keeping the temperature of the coating material A at a constant temperature. The main heating means B is provided, the sub-heating means C is provided below the coating material passage, and the constant temperature zone 22 is provided with the main heating means B on both side wall portions.

In the temperature raising zone 21, each of the main heating means B and the sub-heating means C is arranged over the entire length of the zone from the inlet to the outlet of the temperature raising zone 21.

The main heating means B of each of the temperature raising zone 21 and the constant temperature zone 22 is specifically, the circulation air passages 21A, 2 from the respective zones 21, 22.
The hot air supply ducts 11 arranged on both side walls are provided so that the hot air heated by the burners 21c, 23c, 24c taken out to the 3A, 24A and heated by the burners 21c, 23c, 24c is formed, and the auxiliary heating means C is also provided.
Is disposed below the coating material passage so that a part of the hot air supplied from the circulating air passage 21A to the hot air supply duct 11 is diverted and the diverted hot air is locally blown to the lower surface of the coating material A. It is composed of air jet piping 12.

On the other hand, as another conventional furnace different from this,
As disclosed in Japanese Patent Laid-Open No. 118486, as a main heating means B in the temperature raising zone 21, a hot air supply duct 11 for blowing hot air onto the coating A is partially provided (particularly at the outlet) below the coating passage. The air jet pipe 12 which is placed at the lower part of both side wall portions in a position located on the bottom surface of the coated object A as the sub-heating means C and locally blows hot air to the coated object from the inlet of the temperature raising zone 21. There is one that is arranged so as to extend from a position retracted to the lower side in the transport direction to a position that enters the inside of the constant temperature zone 22.

[Problems to be solved by the device]

However, in the conventional furnace shown in FIG. 3, the paint, which has not been sufficiently heated and dried yet near the inlet of the temperature rising zone 21, is
The coating material droops and adheres to the sub-heating means C located below the coating material passage, and the adhered coating material is hardened by the high temperature heat of the sub-heating means C and then peeled off. There was a problem that the coating quality adhered to the coating material A on the way and the coating quality deteriorated.

Further, as the sub-heating means C, the above-mentioned air jet pipe 12
When using a hot air blowing type such as the one above, the dripping paint will block the hot air outlet, resulting in insufficient heating of the lower surface of the coated object, resulting in poor coating quality. In some cases,

On the other hand, in the conventional furnace having the structure disclosed in Japanese Utility Model Laid-Open No. 60-118486, a sub-heating means C arranged below the coating material passage.
The air jet pipe 12 as the sub-heating means C has a structure in which it is extended rearward from a position retracted to the lower side in the conveying direction of the coating material from the inlet of the temperature raising zone 21. It is possible to avoid the above-mentioned adhesion of the dripping paint to the above, and since the air jet pipe 12 as the sub-heating means C is extended to the position where it enters the inside of the constant temperature zone 22, the starting end thereof is the inlet of the temperature raising zone 21. While retreating to the lower side, the heating of the lower surface of the coated article by the air jet pipe 12 as the sub-heating means C can be sufficient, but a part of the hot air supply duct 11 as the main heating means B is coated. Since it is located below the passage, the hot air supply duct 11 as the main heating means B has the same problem of dripping paint adhesion as described above, and is essentially the same problem as the conventional furnace shown in FIG. But Was Tsu.

By the way, in the conventional furnace shown in Japanese Utility Model Laid-Open No. 60-118486, the hot air supply duct 11 as the main heating means B is
When the structure is such that the air jet pipe 12 as the sub-heating means C is extended backward from the position retracted to the lower side in the conveying direction of the coating material from the inlet of the temperature raising zone 21, the main heating means B is The hot air supply duct 11 and the starting end position of the air jet pipe 12 as the sub-heating means C become the substantial inlet of the temperature raising zone 21. Therefore, the main heating means B
As for both the hot air supply duct 11 as the above and the air jet pipe 12 as the auxiliary heating means C, the problem of dripping paint adhesion occurs.

In view of the above circumstances, an object of the present invention is to prevent the paint from dripping and adhering to the main heating means and the sub-heating means, and
The point is that the coated object can be heated and dried without uneven heating.

[Means for solving the problem]

The coating drying oven according to the present invention is characterized in that the inside of the furnace body is divided into a temperature raising zone for raising the temperature of a coated article conveyed to a predetermined temperature and a constant temperature zone for keeping the coated article at a constant temperature. The heating zone is provided with main heating means on both side wall portions, and a sub-heating means is provided below the coating material passage, and the constant temperature zone is provided with main heating means on both side wall portions. In the configuration to be deployed, the main heating means in the temperature raising zone is arranged at a position deviating from the lower side of the coating material passage path from the inlet to the outlet of the temperature raising zone, and the auxiliary heating means is provided in the temperature raising zone. It is arranged from the position retracted to the lower side in the conveying direction of the coated object from the entrance to the position entering the inside of the constant temperature zone.

[Action]

In the above-mentioned characteristic configuration, the coating material carried into the temperature raising zone is heated immediately after being carried in by the main heating means arranged on both side wall portions with the inlet of the temperature raising zone as a starting end.
The paint that has been insufficiently dried may drop for a while after the carry-in, but when the coating material is transported to some extent, the paint does not drop.

On the other hand, the above-mentioned main heating means starting from the inlet of the temperature rising zone is provided on both side wall portions at a position deviated from the lower side of the coated article passage passage, and also below the coated article passage passage. Since the sub-heating means to be deployed is arranged with the position retracted to the lower side in the coating material conveying direction from the inlet of the temperature rising zone as the starting end, even if the above-mentioned paint droops at the inlet of the temperature rising zone. It is possible to avoid that the dripping paint adheres to the main heating means and the sub-heating means.

In addition, since the sub-heating means is arranged up to the position where it enters the inside of the constant temperature zone, while the starting end of the sub-heating means is retracted from the inlet of the temperature raising zone to the lower side as described above, It is possible to sufficiently raise the temperature of the lower surface of the coated article by the sub-heating means.

[Effect of device]

Therefore, according to the present invention, the dripping paint at the inlet of the temperature raising zone adheres to the main heating means and the sub-heating means, and the adhered paint is cured and peeled off by the high temperature heat of the main heating means and the sub-heating means. It is possible to effectively prevent the deterioration of coating quality due to the adherence of peeled material, and the heating and heating of the lower surface of the coated material, which is not enough with the main heating means on both side walls, also enters the interior of the constant temperature zone. The auxiliary heating means provided is sufficient and uneven heating can be prevented, whereby the coating quality can be greatly improved as compared with the conventional furnace as described above.

〔Example〕

FIG. 1 and FIG. 2 show a paint drying furnace, and 20 is a tunnel-shaped furnace body, which is a suspended transfer by a transfer device 25 and transfers the coating material A in the furnace from the furnace inlet 20a to the furnace outlet 20b. Then, the coating material A is heated and dried during the transportation in the furnace.

The inside of the furnace body 20 is divided into a temperature raising zone 21 for raising the temperature of the coating material A to be dried to a predetermined temperature and a constant temperature zone 22 for keeping the temperature of the coating material A constant. ,
Further, the constant temperature zone 22 is divided into a first constant temperature zone 23 and a second constant temperature zone 24 that follows it.

In the temperature raising zone 21, main heating means B is provided on both side walls, and sub heating means C is provided below the coating material passage, and each constant temperature zone 23, 24 has both side walls. The main heating means B is provided in the section.

For each of the temperature rising zone 21 and each of the constant temperature zones 23, 24, the gas in the zone is taken out from each zone 21, 23, 24,
Circulation air passages 21A, 23A, 24A for returning the taken-out gas to each of the zones 21, 23, 24 again are formed by external ducts 21b, 23b, 24b, and the burner 21c is provided in each of these circulation air passages 21A, 23A, 24A. , 2
3c, 24c and circulation fans 21a, 23a, 24a are provided.

The main heating means B provided in each of the temperature raising zone 21 and each of the constant temperature zones 23, 24 is specifically the burner 21.
Each zone from the circulating air passages 21A, 23A, 24A by heating with c, 23c, 24c
The hot air to be returned to 21,23,24 is sprayed onto the coating A, and is composed of the hot air supply duct 11 blown out into each zone 21,23,24, and the auxiliary heating means C is specifically, Circulation air passage
In the air passage configuration in which a part of the hot air sent from the hot air supply duct 11 of the temperature raising zone 21 from 21A is split to the branch duct 12b, the split hot air is locally blown to the lower surface of the coated object A to raise the temperature. Air jet piping 12 blowing into zone 21
It is composed of.

The hot air supply duct 11 as the main heating means B in each zone 21, 23, 24 is located at the side wall position deviated from the lower side of the coating material passage to both sides, respectively, and the inlets to the outlets of the zones 21, 23, 24 Up to almost the entire length of the zone up to, the air jet pipe 12 as the sub-heating means C is retracted from the inlet of the temperature raising zone 21 by a predetermined length to the lower side in the direction in which the coating material is conveyed. From the set position, the first constant temperature zone
It is located below the painted material passage, extending over the position of 23.

Further, as the above-mentioned predetermined length, although there is a possibility that the coating material A which has not been sufficiently dried drip immediately after being carried into the temperature rising zone 21, the hot air supply duct 11 as the main heating means B is used. At a position where the coating material conveyance progresses to some extent under heating and this paint dripping almost disappears,
It is set so as to be at the starting end position of the air jet pipe 12 as the sub-heating means C.

The first constant temperature zone 23 (in other words, the constant temperature zone 2
The entry length of the air jet pipe 12 in 2) is approximately equal to the receding length of the starting end of the air jet pipe 12 at the inlet of the temperature raising zone 21, and as a result, the air jet pipe 12 as the sub-heating means C is formed. While retreating the starting end of the above from the entrance of the temperature raising zone 21 to the lower side, heating and heating of the lower surface of the coated article by the air jet pipe 12 from below the coated article passage is sufficient.

It should be noted that the specific structure of the hot air blowing in the air jet pipe 12 serving as the sub-heating means C can be modified in various ways. As described above, the starting end of the air jet pipe 12 is retracted from the inlet of the temperature raising zone 21. In addition, the structure may be such that the clogging due to the falling paint is prevented.

Further, although reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a coating / drying furnace according to the present invention, and FIG. 2 is a transverse sectional view of the coating / drying furnace. FIG. 3 is an overall configuration diagram showing a conventional coating drying oven. (20) …… Furnace body, (21) …… Temperature rising zone, (22) …… Constant temperature zone, (A) …… Painted material, (B) …… Main heating means,
(C) ... Sub heating means.

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Claims (1)

(57) [Scope of utility model registration request] 1. A temperature raising zone (21) for raising the temperature of a coated article (A) conveyed in a furnace to a predetermined temperature, and a constant temperature zone (22) for subsequently maintaining the coated article (A) at a constant temperature. The inside of the furnace body (20) is divided, and the heating zone (21) is provided with main heating means (B) on both side wall portions, and a sub-heating means (C) is provided below the coating material passage. And a main heating means (B) is provided on both side wall parts in the constant temperature zone (22), wherein the main heating means (B) in the temperature raising zone (21) is The auxiliary heating means (C) is arranged at a position deviating from the lower side of the material passage path from the inlet of the temperature raising zone (21) to the outlet thereof, and the sub-heating means (C) is in the direction of conveyance of the coating material rather than the inlet of the temperature raising zone (21). From the position retracted to the lower side of
A coating drying oven arranged over a position inside the constant temperature zone (22).