JP3656378B2 - Structure for surface treatment line and exhaust heat supply device used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for performing undercoating, intermediate coating, topcoating, and other surface treatments of automobile bodies and automobile parts (in this specification, the surface treatment is generally referred to as “surface treatment”) and waste used in the same. The present invention relates to a heat supply device, and more particularly, to an automobile surface treatment line building capable of effectively utilizing exhaust heat from a drying furnace and an exhaust heat supply device used therefor.
[0002]
[Prior art]
A painting booth and a painting drying furnace are installed in the line for painting automobile bodies and parts.
The outline of the painting line for automobile bodies will be explained in the order of the process. Unpainted bodies (also called white bodies) brought in from the welding process are first sent to the cleaning / pretreatment process, where oil components adhering to the surface of the body are removed. After the dust is removed, a zinc phosphate coating as a base for electrodeposition coating is formed on the body surface by the pretreatment device. Next, the film is sent to an electrodeposition process, and after an electrodeposition coating film is formed on the body surface by an electrodeposition coating apparatus, the electrodeposition coating film is baked at a temperature of 170 ° C. in an electrodeposition drying furnace.
[0003]
Next, a sealing material for the purpose of preventing rain leakage and rust prevention is applied to the panel mating surface of the body, and a fusible insulator for the purpose of vibration proofing and sound insulation is attached to the indoor floor panel surface. And fusible insulators are baked in a drying oven at a temperature of about 120 ° C.
[0004]
Further, the body is conveyed to the intermediate coating process, and after the intermediate coating is sprayed at the intermediate coating booth, it is baked at a temperature of 140 ° C. in the intermediate coating drying furnace. After finishing the intermediate coating, the body is conveyed to a sharpening process, and after polishing and washing the surface of the intermediate coating film with water, it is dried at a temperature of about 100 ° C. in a draining and drying furnace.
[0005]
When the intermediate coating is finished, the body is transferred to the top coating process. In the top coating step, the top coating material is sprayed at the top coating booth and then baked at a temperature of 140 ° C. in a top coating drying furnace.
[0006]
In this way, the general automobile painting process is completed, but as you can see, many drying furnaces are installed in the painting line, and the baking temperature of each coating film etc. is very high, 100 ℃ ~ 170 ℃. The ambient temperature around the drying furnace is significantly increased. For this reason, in the conventional painting line, in order to improve the environment for workers and the like, the heat generated in the drying furnace is discarded outdoors using a ventilation fan or the like.
[0007]
On the other hand, since the intermediate coat booth and top coat booth mentioned above handle intermediate coats and top coats, fresh air is taken in from the outdoors to maintain the coating conditions, especially the viscosity of the paint, at an appropriate temperature. After adjusting the temperature, air is supplied into the booth.
[0008]
[Problems to be solved by the invention]
However, in the conventional painting line, the heat around the drying furnace is discarded without being reused, which is not preferable from the viewpoint of energy saving. However, in order to suppress the heat generated from the drying furnace, a heat insulating material is also provided on the furnace wall of the drying furnace, but this also has a problem that a high-performance heat insulating material is expensive. is there.
[0009]
The present invention has been made in view of such problems of the prior art, and provides a building for a surface treatment line that can effectively use exhaust heat from a drying furnace and an exhaust heat supply device used therefor. With the goal.
[0010]
[Means for Solving the Problems]
(1) In order to achieve the above object, the surface treatment line building according to claim 1 according to the first aspect of the present invention consolidates the drying furnaces provided in the surface treatment line of an automobile, and the drying furnace And a surface treatment line building in which the other surface treatment apparatus is partitioned by a partition, a first exhaust for supplying atmospheric air in the drying furnace region partitioned by the partition to the air conditioner of the other surface treatment apparatus. It has heat supply means.
[0011]
In the building for a surface treatment line according to the first aspect, since the drying furnace as a heat source is gathered and partitioned by the partition, exhaust heat from the drying furnace can be gathered. On the premise of this, in the surface treatment line building according to claim 1, the air in the drying furnace region is supplied to the air conditioners of the other surface treatment devices by the first exhaust heat supply means. In the winter season when this is necessary, this waste heat can be effectively used in the air conditioner and energy saving of the surface treatment line can be achieved.
[0012]
(2) In the building for a surface treatment line according to the first aspect, the first exhaust heat supply means supplies at least air in the drying furnace area to the air conditioner, and may be operated as necessary. However, the surface treatment line building according to claim 2, wherein the first exhaust heat supply means includes a switching means for selectively switching an air supply destination of the drying furnace region between the air conditioner and the outdoors. Furthermore, it is characterized by having.
[0013]
In the building for a surface treatment line according to claim 2, the air supply destination in the drying furnace area can be switched between the air conditioner and the outdoors by the switching means as necessary. It is possible to improve the environment of the drying furnace area by supplying to the machine to achieve energy saving and exhausting to the outdoors when unnecessary.
[0014]
(3) In the surface treatment line building according to the first or second aspect, the supply destination of the exhaust heat in the drying furnace region is not particularly limited and can be supplied to various surface treatment apparatuses or indoor environments. In the surface treatment line building according to claim 3, the air supply destination of the drying furnace region by the first exhaust heat supply means is an air conditioner of an intermediate coating booth and / or an air conditioner of a top coating booth. It is characterized by.
[0015]
In the intermediate coating booth and the top coating booth, temperature-controlled air is constantly supplied into the booth, so when exhaust heat is supplied to the air conditioners of these coating booths, especially in the season when the ambient temperature is low, the energy required for heating Therefore, the running cost can be reduced.
[0016]
(4) The surface treatment line building according to claim 4 further includes fresh air introducing means for introducing outdoor air into the drying furnace region.
When the air in the drying furnace area is supplied to the air conditioner or outdoors by the first exhaust heat supply means in the surface treatment line building according to any one of claims 1 to 3, the drying furnace area becomes negative pressure and passes through the partition. The air outside the drying furnace area may flow in and adversely affect the air conditioning outside the drying furnace area. In the surface treatment line building according to claim 4, the fresh air introducing means is used to open the drying furnace area outdoors. Therefore, the drying furnace region can be maintained at an appropriate pressure, and adverse effects on the surroundings can be prevented.
[0017]
(5) The surface treatment line building according to (5) further includes second exhaust heat supply means for supplying exhaust from the hot air circulation system of the drying furnace to an air conditioner of the surface treatment apparatus. To do.
[0018]
In the drying furnace region, in addition to the heat from the inside of the furnace, the heat contained in the exhaust of the hot air circulation system of the drying furnace itself exists and has been discarded to the outdoors. In the building for construction, the exhaust heat of this hot air circulation system is also supplied to the air conditioner, so that the energy saving effect by the use of the exhaust heat described above becomes more remarkable.
[0019]
(6) In this case, as in the structure for a surface treatment line according to the sixth aspect, the second exhaust heat supply means supplies the exhaust air from the hot air circulation system of the drying furnace to the air conditioner and the outdoors. It is preferable to further have a switching means for selectively switching between and. In this way, when heat is required, energy is saved by supplying it to the air conditioner, and when it is unnecessary, the hot air circulation system of the drying furnace can be operated normally by exhausting it to the outside.
[0020]
(7) In the structure for a surface treatment line according to claim 5 or 6, the supply destination of the exhaust heat of the hot air circulation system of the drying furnace is not particularly limited, and may be supplied to various surface treatment apparatuses or indoor environments. However, in the structure for a surface treatment line according to claim 7, the supply destination of the exhaust air of the hot air circulation system of the drying furnace by the second exhaust heat supply means is an air conditioner and / or a top coat booth of an intermediate coating booth. It is characterized by being an air conditioner.
[0021]
In the intermediate coating booth and the top coating booth, temperature-controlled air is constantly supplied into the booth, so when exhaust heat is supplied to the air conditioners of these coating booths, especially in the season when the ambient temperature is low, the energy required for heating Therefore, the running cost can be reduced.
[0022]
(8) On the other hand, in order to achieve the above object, according to the second aspect of the present invention, in the exhaust heat supply apparatus according to the eighth aspect, the drying furnace for a surface treatment line of an automobile is integrated and partitioned by a partition. The first air duct provided between the drying furnace area and the air conditioner of the surface treatment apparatus in the other area and the atmosphere air in the drying furnace area partitioned by the partition are blown to the air conditioner of the surface treatment apparatus. It has the 1st ventilation means to do, It is characterized by the above-mentioned.
[0023]
In the exhaust heat supply apparatus according to the eighth aspect, since the drying furnace as a heat source in the building to be installed is gathered and partitioned by the partition, the waste heat from the drying furnace can be gathered. On the premise of this, in the exhaust heat supply device according to claim 8, since the air in the drying furnace region is supplied to the air conditioner of the other surface treatment device by the first blowing means through the first air duct, Especially in the winter season when warm air is required, this exhaust heat can be used effectively in the air conditioner and energy saving of the surface treatment line can be achieved.
[0024]
(9) In the exhaust heat supply apparatus according to claim 8, the first blowing means supplies at least air in the drying furnace region to the air conditioner, and may be operated as necessary. 9. The exhaust heat supply apparatus according to 9, further includes a switching unit that selectively switches the air blowing destination in the drying furnace region between the air conditioner and the outdoors.
[0025]
In the exhaust heat supply device according to claim 9, the air supply destination in the drying furnace region can be switched between the air conditioner and the outdoors by the switching means as necessary. While supplying energy to achieve energy saving, the environment in the drying furnace area can be improved by exhausting to the outside when unnecessary.
[0026]
(10) In the exhaust heat supply apparatus according to claim 8 or 9, the supply destination of the exhaust heat in the drying furnace region is not particularly limited, and can be supplied to various surface treatment apparatuses or indoor environments. 10. The exhaust heat supply apparatus according to 10, wherein the air blowing destination in the drying furnace region is an air conditioner of an intermediate coating booth and / or an air conditioner of a top coating booth.
[0027]
In the intermediate coating booth and the top coating booth, temperature-controlled air is constantly supplied into the booth, so when exhaust heat is supplied to the air conditioners of these coating booths, especially in the season when the ambient temperature is low, the energy required for heating Therefore, the running cost can be reduced.
[0028]
(11) The exhaust heat supply apparatus according to claim 11 further includes fresh air introducing means for introducing outdoor air into the drying furnace region.
When the air in the drying furnace area is supplied to the air conditioner or outdoors by the first blower means in the exhaust heat supply device according to any one of claims 8 to 10, the drying furnace area becomes negative pressure and is outside the drying furnace area via the partition. However, in the exhaust heat supply apparatus according to claim 11, outdoor air is introduced into the drying furnace area by the fresh air introduction means. The drying furnace region can be maintained at an appropriate pressure, and adverse effects on the surroundings can be prevented.
[0029]
(12) The exhaust heat supply apparatus according to claim 12, wherein a second air duct provided between an exhaust port of the drying furnace and an air conditioner of the surface treatment apparatus, and exhaust of the drying furnace are air-conditioned. It further has the 2nd ventilation means which ventilates to a machine, It is characterized by the above-mentioned.
[0030]
In the drying furnace region, in addition to the heat from the inside of the furnace, the heat contained in the exhaust of the hot air circulation system of the drying furnace itself exists and was conventionally discarded outdoors. In the apparatus, the exhaust air heat of the hot air circulation system is also supplied to the air conditioner, so that the energy saving effect by using the exhaust heat described above becomes more remarkable.
[0031]
(13) In this case, as in the exhaust heat supply device according to the thirteenth aspect, the second blowing unit selectively switches the supply destination of the exhaust gas of the drying furnace between the air conditioner and the outdoors. It is preferable to further have. In this way, when heat is required, energy is saved by supplying it to the air conditioner, and when it is unnecessary, the hot air circulation system of the drying furnace can be operated normally by exhausting it to the outside.
[0032]
(14) In the exhaust heat supply apparatus according to claim 12 or 13, the supply destination of the exhaust heat of the hot air circulation system of the drying furnace is not particularly limited, and can be supplied to various surface treatment apparatuses or an indoor environment. The exhaust heat supply device according to claim 14, wherein a supply destination of the exhaust air of the hot air circulation system of the drying furnace by the second blowing unit is an air conditioner of an intermediate coating booth and / or an air conditioner of a top coating booth. It is characterized by.
[0033]
In the intermediate coating booth and the top coating booth, temperature-controlled air is constantly supplied into the booth, so when exhaust heat is supplied to the air conditioners of these coating booths, especially in the season when the ambient temperature is low, the energy required for heating Therefore, the running cost can be reduced.
[0034]
【The invention's effect】
According to the structure for a surface treatment line according to claim 1 and the exhaust heat supply device according to claim 8, exhaust heat from the drying furnace can be collected and supplied to the air conditioner of the surface treatment device. Especially in the winter season when warm air is required, this exhaust heat can be effectively used for the air conditioner and energy saving of the surface treatment line can be achieved.
[0035]
According to the structure for a surface treatment line according to claim 2 and the exhaust heat supply device according to claim 9, when heat is necessary, it is supplied to an air conditioner to achieve energy saving, and when it is unnecessary, it is exhausted outdoors. By doing so, the environment of the drying furnace region can be improved.
[0036]
According to the structure for a surface treatment line according to claim 3 and the exhaust heat supply device according to claim 10, since the exhaust heat is supplied to the air conditioner of the intermediate coating booth and / or the top coating booth, the energy required for heating is increased. As a result, the running cost can be reduced. It is especially suitable for the season when the ambient temperature is low.
[0037]
According to the structure for a surface treatment line according to claim 4 and the exhaust heat supply device according to claim 11, the drying furnace region can be maintained at an appropriate pressure, and adverse effects on the surroundings can be prevented.
[0038]
According to the structure for a surface treatment line according to claims 5 and 6 and the exhaust heat supply device according to claims 12 and 13, the exhaust heat of the hot air circulation system is also supplied to the air conditioner. The effect becomes more remarkable.
[0039]
According to the surface treatment line building according to claim 7 and the exhaust heat supply device according to claim 14, the exhaust heat is supplied to the air conditioner of the intermediate coating booth and / or the top coating booth. As a result, the running cost can be reduced. It is especially suitable for the season when the ambient temperature is low.
[0040]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of a structure for a surface treatment line (hereinafter also referred to as a coating factory) according to the present invention, and FIG. 2 is a cross-sectional view of a main part of the embodiment.
[0041]
The outline of the coating line will be described with reference to FIG. 1. In the coating factory P of the present embodiment, a processing apparatus for carrying out the coating process after the intermediate coating is installed, and the cleaning process preceding this is performed. The processing apparatus from the process to the sealing process is installed in a painting factory below the painting factory P.
[0042]
The automobile body transported from the painting factory below the floor is mounted on the lifter 1 and is transferred to a painting cart (not shown) that circulates in the painting factory P.
[0043]
In the painting factory P of the present embodiment, an intermediate coating booth 2 for spraying the intermediate coating material onto the body transferred by the lifter 1 and an intermediate coating drying furnace 3 for baking the sprayed intermediate coating material are installed. Yes.
[0044]
Also, a first topcoat booth 4 and a second topcoat booth 6 for spraying the topcoat onto the intermediatecoat film baked in the middlecoat drying furnace 3, and a first for baking the sprayed topcoat A top coat drying furnace 5 and a second top coat drying furnace 7 are installed.
[0045]
Incidentally, the intermediate coating booth 2 and the intermediate coating drying furnace 3 are a pair, whereas the upper coating booths 4 and 6 and the upper coating drying furnaces 5 and 7 are two pairs. This is because the required man-hour is larger. Therefore, the present invention is not limited to such a configuration, and the pair of topcoat booths and topcoat drying ovens may be one pair or three or more pairs with respect to the pair of intermediate coat booths and intermediate coat drying ovens.
[0046]
The intermediate coating booth 2, the first top coating booth 4 and the second top coating booth 6 are installed side by side, and accordingly, the intermediate coating drying furnace 3, the first top coating drying furnace 5 and the second top coating drying booth. A furnace 7 is also installed side by side.
[0047]
In particular, in the painting factory P of the present embodiment, a partition 8 is provided in the building so as to isolate the intermediate coating drying furnace 3, the first top coating drying furnace 5, and the second top coating drying furnace 7 which are heat sources. The formed drying furnace region 9 is not sealed, but exhaust heat generated in the drying furnaces 3, 5, and 7 is sufficiently concentrated.
[0048]
Further, as shown in FIG. 2, a suction port 11 for sucking air in the drying furnace region 9 is opened on the ceiling of the drying furnace region 9, and a blower fan 12 is provided here. A duct 13 is connected to the discharge port of the blower fan 12 and branches into an air passage led to the air conditioner gallery 18 and an air passage led to the exhaust port 17. And the dampers 15 and 16 for switching the air sent from the ventilation fan 12 to the air conditioner gallery 18 and the exhaust port 17 are provided in each air path. Accordingly, when it is desired to supply the air in the drying furnace region 9 to the air conditioner gallery 18, the damper 15 is opened and the damper 16 is closed. Conversely, when the air in the drying furnace region 9 is to be exhausted without being supplied to the air conditioner gallery 18, the damper 15 is closed and the damper 16 is opened. These constitute the first exhaust heat supply means 10 of the present invention.
[0049]
The air conditioner gallery 18 communicates with a suction port 14 opened in an air conditioning room 40 installed in the upper part of the booth 2, and air in the drying furnace region 9 or outside air from the suction port of the air conditioner gallery 18 is air-conditioned. It is introduced into the chamber 40.
[0050]
A blower fan 41 for supplying conditioned air to the booth 2 is provided in the air conditioning chamber 40, and a heating burner, a dust removal filter, a humidifying shower, and a humidity control device are provided upstream of the blowing fan 41. Various devices such as a burner are arranged, and the conditioned air that has passed through these devices is blown out from the upper part of the booth 2 through a duct 43 provided in the upper part of the booth 2.
[0051]
Incidentally, the conditioned air blown into the booth 2 flows downward in the entire booth 2 and is discharged out of the system by an exhaust fan outside the figure. By the air conditioning in the booth 2, the temperature of the paint sprayed in the booth 2 is maintained at an appropriate temperature, and the coating quality is maintained. Further, by sending wind at a constant speed from the ceiling of the booth 2 toward the floor, it is possible to suppress the spraying of the atomized paint and prevent a color jumping failure to the adjacent body.
[0052]
In the painting factory P of the present embodiment, a branch duct 22 is further provided in the exhaust duct 21 of the hot air circulation system of the drying furnace, and the other end of the branch duct 22 is connected to the air conditioner gallery 18 communicating with the air conditioning chamber 40 described above. ing. In addition, dampers 24 and 25 are provided in the respective air passages in order to switch the exhaust gas supply destination of the exhaust duct 21 to the original exhaust port 26 and the air conditioning chamber 40. Therefore, when it is desired to supply the exhaust duct 21 to the air conditioning chamber 40, the damper 24 is opened and the damper 25 is closed. Conversely, when it is desired to exhaust the exhaust duct 21 without supplying it to the air conditioning chamber 40, the damper 24 is closed and the damper 25 is opened. These constitute the second exhaust heat supply means 20 of the present invention.
[0053]
Furthermore, in the painting factory P of the present embodiment, fresh air introduction means 30 for introducing outside air into the drying furnace region 9 is provided. The fresh air introduction means 30 sucks the outside air by the blower fan 32 while being filtered by the filter 33, and introduces the outside air into the drying furnace area 9 from the discharge port 31 opened on the ceiling of the drying furnace area 9. This is because when the air in the drying furnace area 9 is supplied outside the area by the first exhaust heat supply means 10 described above, the inside of the drying furnace area 9 becomes a negative pressure as compared with the other areas, thereby partitioning. This is because air flows in through the gaps 8 and as a result, the air flow in the painting plant P is disturbed. Therefore, particularly when the first exhaust heat supply means 10 is in operation, it is desirable to operate the fresh air introduction means 30 so that the air pressure in the drying furnace region 9 is kept equal to the other regions.
[0054]
The first exhaust heat supply means 10 and the fresh air introduction means 30 shown in FIG. 2 may be provided in each of the booths 2, 4, 6 and the drying furnaces 3, 5, 7, or one or Two or more may be installed.
[0055]
Next, the operation will be described.
In the intermediate coating booth 2 and the top coating booths 4 and 6, it is generally desirable to maintain a room temperature of about 18 ° C. to 22 ° C. in terms of the stability of the paint viscosity and the working environment, but the outside air temperature is low. In the winter season, the temperature difference is over 10 degrees. For this reason, conventionally, a heater is provided in the air-conditioning room 40 to heat the outside air sucked from the air-conditioner gallery 18 to the above-described appropriate temperature, and this is supplied into the booth. A burner, steam, or the like is used as the heat source of the heater, but the energy is reflected in the running cost.
[0056]
In the present embodiment, heat generated from a plurality of drying furnaces is used, and the drying furnaces that serve as the heat sources are aggregated and partitioned by a partition, so that the exhaust heat from the drying furnace is firstly put in one place. Can be aggregated. Further, the warm air gathered in this way is supplied to the air conditioning chambers 40 of the booths 2, 4 and 6 by the first exhaust heat supply means 10. As a result, especially in the winter season when heating is required, this warm air can be supplied to the booth as it is or by slightly warming it, saving the heat energy such as burners and steam that were previously consumed. be able to.
[0057]
Further, when the outside air temperature is lower, the exhaust air of the hot air circulation system can be supplied to the air-conditioning chamber 40 by the second exhaust heat supply means 20 in addition to the first exhaust heat supply means 10. The energy saving effect by use becomes more remarkable.
[0058]
Incidentally, when the air in the drying furnace region 9 is supplied to the air conditioning chamber 40 by the first exhaust heat supply means 10, the drying furnace region 9 becomes negative pressure, and the air outside the drying furnace region 9 flows through the partition 8. The air conditioning outside the drying furnace area 9 may be adversely affected, but this can be prevented by operating the fresh air introduction means 30 to introduce the outside air into the drying furnace area 9.
[0059]
The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
[0060]
For example, in the above-described embodiment, the coating factory P in which the coating apparatus after the intermediate coating process is installed is taken as an example, but the present invention is applied to the coating factory in which all the coating apparatuses from the cleaning process to the top coating process are installed. It goes without saying that can also be applied. In this case, it is preferable that the electrodeposition drying furnace and other drying furnaces are also integrated in the drying furnace region 9.
[0061]
The first exhaust heat supply means 10 and the second exhaust heat supply means 20 may be used in combination as in the above-described embodiment, or only one of them may be used.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a surface treatment line building of the present invention.
2 is a cross-sectional view of a main part of the embodiment shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Lifter 2 ... Intermediate coating booth 3 ... Intermediate coating drying oven 4 ... First top coating booth 5 ... First top coating drying oven 6 ... Second top coating booth 7 ... Second top coating drying oven 8 ... Partition 9 ... Drying Furnace area 10 ... first exhaust heat supply means 11 ... suction port 12 ... blower fan (blower means)
13 ... Duct 14 ... Suction port 15, 16 ... Damper 17 ... Exhaust port 18 ... Air conditioner gallery 20 ... Second exhaust heat supply means 21 ... Exhaust duct 22 ... Branch ducts 24, 25 ... Damper 26 ... Exhaust port 30 ... Fresh Air introduction means 31 ... discharge port 32 ... blower fan 33 ... filter P ... painting factory (building for surface treatment line)

Claims (14)

In a building for a surface treatment line that consolidates drying ovens provided in a surface treatment line of an automobile and the drying oven and other surface treatment devices are partitioned by a partition, the atmosphere in the drying furnace region partitioned by the partition A surface treatment line building comprising first exhaust heat supply means for supplying air to an air conditioner of the other surface treatment apparatus. The surface treatment line according to claim 1, wherein the first exhaust heat supply unit further includes a switching unit that selectively switches an air supply destination of the drying furnace region between the air conditioner and the outdoors. Building. The surface treatment according to claim 1 or 2, wherein an air supply destination of the drying furnace region by the first exhaust heat supply means is an air conditioner of an intermediate coating booth and / or an air conditioner of a topcoat booth. Building for lines. The building for surface treatment lines according to any one of claims 1 to 3, further comprising fresh air introduction means for introducing outdoor air into the drying furnace region. 5. The surface treatment line according to claim 1, further comprising second exhaust heat supply means for supplying exhaust air from the hot air circulation system of the drying furnace to an air conditioner of the surface treatment apparatus. Building. The said 2nd waste heat supply means further has a switching means which selectively switches the supply destination of the exhaust_gas | exhaustion of the hot air circulation system of the said drying furnace to the said air conditioner and the outdoors. Building for surface treatment line. The supply destination of the exhaust air of the hot air circulation system of the drying furnace by the second exhaust heat supply means is an air conditioner of an intermediate coating booth and / or an air conditioner of a top coating booth. Building for surface treatment line. A drying furnace for an automobile surface treatment line is integrated, and a first air duct provided between a drying furnace region partitioned by a partition and an air conditioner of a surface treatment device in another region, and the partition by the partition And a first blower for blowing the atmosphere air in the drying furnace area to the air conditioner of the surface treatment apparatus. The exhaust heat supply apparatus according to claim 8, further comprising a switching unit that selectively switches the air blowing destination in the drying furnace region between the air conditioner and the outdoors. The exhaust heat supply device according to claim 7 or 8, wherein the air blowing destination in the drying furnace region is an air conditioner of an intermediate coating booth and / or an air conditioner of a top coating booth. The exhaust heat supply device according to any one of claims 7 to 9, further comprising fresh air introduction means for introducing outdoor air into the drying furnace region. A second air duct provided between an exhaust port of the drying furnace and an air conditioner of the surface treatment apparatus; and a second blowing unit for blowing the exhaust of the drying furnace to the air conditioner. The exhaust heat supply device according to any one of claims 8 to 11. The exhaust heat supply apparatus according to claim 12, wherein the second air blowing unit further includes a switching unit that selectively switches a supply destination of exhaust gas from the drying furnace between the air conditioner and the outdoors. 14. The exhaust gas according to claim 12 or 13, wherein a supply destination of exhaust air of the hot air circulation system of the drying furnace by the second blowing means is an air conditioner of an intermediate coating booth and / or an air conditioner of a top coating booth. Heat supply device.

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