JPH0655288B2 - Paint drying equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coating / drying apparatus that performs spray coating of a vehicle body and hot air drying after coating in the same room in an automobile repair shop (so-called sheet metal coating factory) or the like. .

[Conventional technology]

As a coating drying apparatus of this type, a one-chamber type coating drying apparatus 1 for an automobile C as a material to be coated is conventionally known as shown in, for example, FIG.
4991 publication).

This is because the air outlet 5 is opened on the ceiling of the coating / drying chamber 2, the duct 4 communicating with the air outlet 5 is provided on the roof of the coating / drying chamber 2, and the duct 4 is installed on the side of the coating / drying chamber 2 in a fresh state. A fan (not shown) for painting which blows the fresh air from the air outlet 5 into the coating drying chamber 2 is provided, and the side of the coating drying chamber 2 is heated at a proper time. An air blower 8 for drying is provided which sends outside air into the duct 4 through the air generator 3 and blows heated air from the air outlet 5, and an exhaust port 6 is opened on the floor of the coating / drying chamber 2. The exhaust port 6 is connected to an exhaust duct 7 that produces a suction flow by an exhaust fan (not shown).

By the way, in general, this type of equipment is designed based on the Organic Solvent Poisoning Prevention Regulations of the Industrial Safety and Health Law in order to create a good coating environment in consideration of the safety and health of the coating operator during spray coating described later. Has been done. Therefore, the air outlet 5 has an opening area of 0.6 times or more of the floor area (at least 26 square meters), and the wind velocity of the airflow from the air outlet is 0.2 meters per second or more over substantially the front surface of the floor. That is, the size of ducts, fans, exhaust fans, etc. should be relatively large so that the required air flow rate in the coating and drying room is at least 312 cubic meters per minute (26 m ² × 0.2 m / s × 60 s). It is set. Therefore, in the drying system, the air outlet 5 and the exhaust fan designed according to the coating conditions are used as they are, and therefore the blower 8 is also set to a size capable of sending an air volume corresponding thereto.

When spray coating is performed in the coating drying chamber 1, fresh air is fed by a fan to be blown down from the air outlet 5, and further exhausted from an exhaust port 6 by an exhaust fan to forcefully send and exhaust air. Then, the scattered paint residue, which is generated in about half or more, is put on the airflow and discharged.

In addition, when drying the painted automobile C, the heated air generator 3 is operated, and the blower 8 blows the heated air from above the automobile C toward the same.
The exhaust is performed from the exhaust port 6.

Although it can be dried with a high-temperature heating element such as an infrared light bulb, it causes a low temperature ignition of the paint dust that has adhered and accumulated during painting, or the solvent vapor is easy to reach the ignition point temperature and easily causes an explosion fire. The hot-air drying method is used because it is dangerous.

In the drying of the automobile C after coating, it is optimal from the viewpoint of curing and productivity of the paint to raise the surface temperature of the vehicle body to about 60 ° C. and maintain the temperature for about 40 minutes to finish the drying. As a condition, the temperature of the heated air must be 8
It is set to around 0 ° C to create the required conditions. If the surface temperature of the vehicle body is set to a high temperature of 80 ° C. or higher in order to cure the paint faster, the resin fitting parts attached to various parts of the vehicle body may be damaged, which is not preferable.

[Problems to be Solved by the Invention]

In such a conventional one-chamber type coating / drying apparatus 1, the temperature of the side surface X of the vehicle body such as the fender of the automobile C, the door and the step portion of the door does not easily rise during heating, and the roof, the hood, the trunk lid portion, etc. 2 compared to the upper surface Y of the car body
The temperature tends to be lower by about 0 to 40 ° C., so that the side surface portion X is in a dry state, or the side surface X is in a dry state, so that the amount of dust attached increases, or so-called luster occurs. Therefore, there is a problem that the coating film quality on the side surface portion X and the upper surface portion Y becomes non-uniform.

In addition, if the side surface portion X is to be dried as much as possible, the drying time must be extended, so that there is a problem that the elapsed time becomes longer and the productivity is impaired.

These are because the side surface X of the vehicle body has a higher degree of polymerization of the iron plate per unit area than the upper surface Y of the vehicle body, and the heat transfer is slower by that amount. Since it hits directly from the vertical direction, the temperature rises easily to the required temperature in this part, but in the side surface part X of the vehicle body, it flows in parallel along the side surface of the vehicle body and the temperature of the heated air also drops. The reason is that the temperature rise becomes slow.

Furthermore, as a characteristic of the spray coating, the coating rate of the coating is good because the upper surface portion has less drooping flow than the side surface portion, and a thick film is formed accordingly. In the drying system, an undesirably large amount of heated air is blown down from the ceiling because the outlet and exhaust fan designed according to the painting conditions are used, but in such a state, If the above-mentioned relatively large amount of heated air directly hits the upper surface part, the drying conditions of the surface and the inside will be different, the surface will be dried relatively quickly, and the evaporation of the solvent inside will be insufficient. So-called cracks, pinholes, craters, etc. are likely to be generated by the non-evaporated gas, which causes a problem that the coating film surface is roughened.

Therefore, if the blowout flow rate and temperature are reduced to prevent these occurrences, or if the blowout flow rate and temperature are gradually increased to gradually dry, the side surface becomes less and less dried. The above-mentioned problems are likely to occur.

Therefore, a technical problem in the present invention is to make the temperature of the upper surface portion and the side surface portion of the object to be dried uniform as much as possible, and to perform drying without causing a crack, pinhole or crater of the coating material. To provide a drying device.

[Means for solving problems]

The technical means of the present invention for solving such a problem is, as illustrated in the embodiment diagram of FIG. 1, as a coating drying apparatus, communicates with the outside air above the article to be coated (C) to be coated. An upper opening (15) serving as a vent, and a lower opening (18) serving as a vent below the object to be dried (C).
A coating drying chamber (10) in which a plurality of outlets (13) located on the side of the body to be coated (C) are respectively opened.
And the coating drying chamber (1) through the upper opening (15).
0) feeding the outside air into the coating drying chamber (10) through the lower opening (18) and sucking the air in the coating drying chamber (10), and the unit through the lower opening (18). The air in the coating / drying chamber (10) is sucked, a part of the sucked air is exhausted to adjust the flow rate, and the air whose flow rate is adjusted is heated to be coated through the air outlet (13). Drying that is fed to the side of the drying body (C) and sucks the same amount of air as the exhaust amount from the upper opening (15) into the coating drying chamber (10) through the coating unit (N1). And a unit (N2) for use.

In the coating unit (N1), the coating drying chamber (1
It is desirable to provide a feeding device (20) for introducing the outside air into the inside 0) and a suction device (40) for sucking the air inside the coating drying chamber (10).

The drying unit (N2) includes the coating drying chamber (1
0) a heated air generator (30) for feeding the air to the dried object (C) to be coated through the blowout port (13), and the heated air generator (30) for sucking air. 30) and a blower device (50) for feeding the blower device to the blower device (50), and the blower device (50) has a filter box (52) having a filter for filtering the sucked air, and sucks air through the filter box (52). A blower (53) for feeding the generated air to the heated air generator (30), and the blower (5)
It is desirable to provide an air conditioner (54) that partially discharges the air sent by 3) and adjusts the flow rate.

Further, as the coating drying device, an outlet (1) which is located on the side of the article to be dried (C) placed indoors and blows heated air toward the side of the article to be dried (C) is provided.
3), a coating drying chamber (1) having an upper opening (15) opened in the ceiling and a lower opening (18) opened in the floor.
0) and the coating drying chamber (1) through the upper opening (15).
0) a feeding device (20) for feeding outside air, a suction device (40) for sucking the air in the coating drying chamber (10) from the lower opening (18), and the lower opening (18) A heating air generator (30) for heating and raising the temperature of the air sucked from the air and sent to the air outlet (13), and the air sucked from the lower opening (18) for the heating air generator (3).
Blower (5) for feeding to the outlet (13) via
3) and an air conditioner (54) for adjusting a flow rate by exhausting part of the air introduced from the blower (53) into the heated air generator (30). Is.

[Action]

According to the coating / drying apparatus having such a configuration, at the time of coating, the object to be dried (C) is installed in the coating / drying chamber (10) and only the coating unit (N1) is operated to perform coating. . When the coating unit (N1) is operated, the indoor air is sucked from the lower opening (18) and the outside air is introduced from the upper opening (15), and a downward airflow from the ceiling to the floor is generated. Paint mist scattered indoors is discharged to the outside.

After that, when performing drying, only the drying unit (N2) is operated to perform drying. Adjusting the opening of each outlet (13) on the side wall side according to the side surface position of the object to be dried (C),
When the drying unit (N2) is activated, the lower opening (1
8) Suction indoor air from the air outlet (13)
The heated air blows out a horizontal airflow toward the side surface of the object to be dried (C), and introduces outside air corresponding to the exhaust volume into the room from the upper opening (15) to generate a downward airflow from the ceiling to the floor and A uniform airflow is generated on the side surface of the coating-dried body (C), and the entire surface of the coating-dried body (C) is uniformly dried by the descending airflow and the horizontal airflow whose air volumes are appropriately adjusted.

When the coating unit (N1) is operated during coating, both the feeding device (20) and the suction device (40) are operated to suck the air in the coating drying chamber (10) and dry the coating. Outside air is introduced into the chamber (10). When the coating unit (N1) is operated during the subsequent drying, only the suction device (40) is operated to operate the coating drying chamber (1
0) Suctions the air inside, and the negative pressure causes the paint drying room (1
Outside air is introduced into 0).

Further, when the drying unit (N2) is operated during drying, the air blower (50) and the heated air generator (30).
Is activated to send heated air of a predetermined temperature toward the side surface of the material to be dried (C) installed in the coating / drying chamber (10) from the air outlet (13). In this case, the blower (53) and the heated air generator (30) are activated, and the blower outlet (1
From 3), heated air is blown to the object to be dried (C) installed in the coating drying room (10), and further, the blower (5)
The air sucked from the coating drying chamber (10) by 3) is partially exhausted by the air conditioner (54), and the coating drying chamber (1
The amount of air sucked from 0) and the amount of heated air blown into the coating drying chamber (10) are adjusted, and a shortage of air is newly introduced from the upper opening (15) to dry the coated object (C). ) Adjust the ambient temperature and air volume to uniformly dry the entire surface of the article to be dried (C).

Further, when a coating drying device is used, when coating is performed, the material to be dried (C) is installed in the coating drying chamber (10) and the feeding device (20) and the suction device (40) are driven. Then, the outside air is introduced from the upper opening (15) and the air in the room is sucked from the lower opening (18) to generate an air flow from the ceiling to the floor. Therefore, the paint mist scattered in the room rides on this air flow and is discharged to the outside of the room.

Next, when the coated object to be dried (C) is dried, a blower (53) and a heated air generator (3) are used.
0) is activated. Then, the heated air is blown from the blowout port (13) toward the side surface portion (X) of the object to be dried (C), and at the same time, the amount of fresh air exhausted by the air conditioner (54) is increased. It flows in downward through the opening (15).

At this time, the heated air tries to rise upward due to its high temperature, but the flow of fresh air from the ceiling toward the floor causes the heated air from the outlet (13) to hit the side surface (X) and rise upward. The heated air is uniformly distributed to the side surface portion (X), and the heating of the side surface portion (X) is promoted.

The heated air that rises continuously mixes with fresh air, so
The temperature of the side surface (X) becomes slightly lower than that of the heated air, and the temperature of the upper surface (Y) is suppressed by the flow of fresh air and relatively slowly rises while wrapping around the entire upper surface (Y) to reach the upper surface ( The heating and drying of Y) is also sufficiently performed.

The amount of the heated air coming out of the air outlet (13) and hitting the side face downward is sucked from the lower opening (15) by the suction of the blower (53), so that the amount of the heated air becomes larger than the amount upward and the dried object to be coated is dried. The lower surface of (C) is dried and the lower temperature is raised, and the dried object to be coated by heat conduction (C)
To raise the temperature above, and promote uniform drying.

〔Example〕

 Hereinafter, the present invention will be described in detail based on examples.

In addition, this embodiment will be described with reference to the drawings by taking a case of a one-chamber type coating and drying apparatus for an automobile as an example.

The basic configuration of the one-chamber type coating / drying apparatus B shown in FIGS. 1 to 3 is as follows: the coating / drying chamber 10, the feeding device 20, the heated air generating device 30, the first suction device 40, and the second suction device 40. And a suction device of two systems including the suction device 50.

Further, the feeding device 20 is combined with the first suction device 40 to form a coating unit N1, and the heating air generator 30
Is combined with the second suction device 50 to form a drying unit N.
Make up 2.

The coating / drying chamber 10 is formed of an appropriate material, is provided with a window 11 through which the inside can be visually observed, and is formed as a simple building in which an automobile C as a material to be dried is put in and out through an entrance provided on one surface.

Inside the coating / drying chamber 10, a duct 12 is provided as a side wall side passage through which the heated air from the heated air generator 30 passes. The duct 12 is provided so as to surround the inside of the coating / drying chamber 10 and extends on the side wall of the interior of the vehicle, and the outlet of the duct is connected to the automobile C.
It is set at the height where the door panel of is located.

Reference numeral 13 denotes a plurality of air outlets formed in the duct 12, which opens toward the center of the coating / drying chamber 10. And
When the automobile C is arranged in the coating / drying chamber 10, the air outlet 13 is located on the side of the automobile C.

Reference numeral 14 is a slide door for adjusting the opening of the outlet 13. Generally, the opening degree of the outlet 13 is set to be wide on the supply side of heating air and narrow on the end side in order to blow out a uniform amount of heated air from each outlet 13. Further, by appropriately adjusting the opening degree of each outlet 13 according to the shape of the automobile C, the amount of air blown to each portion of the automobile C as the material to be dried is made appropriate.

Reference numeral 15 is an upper opening formed in the ceiling of the coating / drying chamber 10, into which a filter 16 for fine dust is fitted. The roof portion is an air supply chamber box 17 that covers the upper opening 15.

A lower opening 18 is provided on the entire surface of the floor of the coating / drying room 10, and a net-like floor plate material is fitted as a floor plate 19.

The feeding device 20 in the coating unit N1 has a duct 21 communicating with the air supply chamber box 17, and an upper opening 15 through an external opening 22 communicating with the outside air through the duct 21.
And a blower fan 23 for forcibly blowing outside air. Reference numeral 24 is an air supply filter fitted in the external opening 22.

The first suction device 40 in the coating unit N1 is shown in FIG.
As shown in 3 and 3, an exhaust fan 43 that functions as an exhaust device and sucks and exhausts the air in the coating drying chamber 10 through an exhaust duct 41 that communicates with the lower opening 18 and an exhaust tower 42 that communicates with the outside. And an air flow control valve 43a that also functions as a backflow prevention device. Reference numeral 44 is a paint mist suction filter provided in front of the exhaust fan 43.

The heated air generator 30 in the drying unit N2 is
For example, it has a built-in gas burner that burns city gas and the like, and uses the air sent from the second suction device 50 forming the blower as a heating air source.

The second suction device 50 in the drying unit N2 sucks the air in the coating / drying chamber 10 and sends it to the heated air generator 30 to circulate the air.
8 and a circulation duct 51, a filter box 52 having a filter communicating with the circulation duct 51, and a heating air generator 3
A circulation fan 53 that blows the air inside the coating drying chamber 10 to 0.
And an air conditioner 54 provided between the heated air generator 30 and the circulation fan 53 to evacuate a part of the air from the circulation fan 53 to the outside to adjust the air volume to the heated air generator 30. I have it.

In the case of the present embodiment, the amount of air escaped from the air conditioner 54 is such that 15% of the amount of air blown from the circulation fan 53 is released.

Reference numeral 60 denotes a control device, which includes a manual start switch, a timer for controlling the operating time, and the like, and a selection switch for selectively driving the coating unit N1 or the drying unit N2.

Reference numeral 62 is an opening / closing door provided at the entrance of the coating / drying chamber 10, and 63 is a fluorescent lamp for illumination provided on both sides of the ceiling.

The sizes of the upper opening, the blower fan, the exhaust fan, etc. in this device B are determined and designed based on the above-mentioned organic solvent poisoning prevention rule of the Industrial Safety and Health Law.

When coating is performed using the one-chamber type coating / drying apparatus B configured as described above, as shown in FIG. 4, the automobile C is installed at substantially the center of the coating / drying room 10 and the controller 60 is used for coating. The unit N1 is selected and driven, and the feeding device 20
Only the blower fan 23 and the exhaust fan 43 of the first suction device 40 are driven.

Then, the outside air is introduced from the upper opening 15 and the air in the room is exhausted from the lower opening 18 to generate an air flow from the ceiling to the floor. Therefore, the paint mist scattered inside the room at the time of coating is discharged to the outside of the room by riding on this air flow.

In this state, if the heated air generator 30 is further operated, the coating can be performed while heating.

Next, when drying the painted automobile C,
The controller 60 selects and drives the drying unit N2 to operate the heated air generator 30 and the circulation fan 53 of the second suction device 50.

Then, as shown in FIGS. 2 and 3, the circulation fan 5
Air is sucked from the coating / drying chamber 10 by 3 and heated air is blown from the outlet 13 of the duct 12 toward the side surface X of the automobile C.

Further, when the above suction amount is expressed as 100, the air sucked from the coating drying chamber 10 is 15% from the air conditioner 54.
Since the air is discharged, the amount of air blown out from the air outlet 13 becomes 85. Therefore, an amount of air equal to the difference (15) between the amount of suction (100) and the amount of air blown (85) is externally applied to the upper opening 15
Through the upper opening 15 and the lower opening 18 to generate a flow of fresh air.

In this case, the heated air blown out from the outlet 13 tends to rise upward because of its high temperature, but due to the flow of fresh air from the ceiling to the floor, it partially goes downward. That is, the heated air from the air outlet 13 is distributed to the upward air and the downward air while hitting the side surface portion X, so that an air flow that vertically strikes the side surface portion X and an air stream that obliquely strikes the side surface portion X are generated. The heated air will hit the side surface X evenly.

The heated air that hits the side surface portion X rapidly heats the side surface portion X, which has a high degree of polymerization of the iron plate and slow heat transfer, and accelerates the temperature rise.

Also, the heated air rising upward mixes with fresh air,
Although the temperature of the side surface portion X becomes slightly lower than that of the heated air, it rises so as to wrap around the upper surface portion Y because it is pressed by the flow of fresh air and becomes a relatively gentle air flow. Since the degree of polymerization of the iron plate is lower than that of the portion X, the upper surface portion Y is sufficiently heated.

Fig. 5 shows the amount of heated air blown and the amount of external air introduced.
It is an example of the temperature-time curve which set it to 5:15 and measured the surface temperature rise of each part of a vehicle body.

As shown in FIG. 6, the measurement positions (mounting positions of the temperature sensor) are three places on the upper surface, that is, the bonnet, the roof, and the trunk, and three side faces, that is, the front fender, the step, and the rear fender. Is.

As shown in the results of FIG. 5, the side surface portion X is kept at a slightly higher temperature than the upper surface portion Y, rises to about 60 ° C. almost uniformly with the upper surface portion Y, and the rising time is about 20 minutes. The subsequent drying time can be made substantially equal to that of the upper surface portion Y.

In this way, since the drying conditions of the upper surface portion Y and the side surface portion X are substantially the same, it is possible to make the coating film quality uniform,
And the time required for drying becomes shorter. That is, in the past, the temperature of the side surface portion X was 20 to 40 ° C. lower even when the upper surface portion Y was 60 ° C., and the time required to complete the drying had to be lengthened accordingly. Compared with this, the drying time can be greatly shortened. As a result, the amount of gas consumed is reduced and the fuel cost is reduced, as the time required to complete the drying is shortened.

Further, since the heating air generator 30 uses a part of the heating air in the coating drying chamber 10 as a heating air source, the heating efficiency is good, and in this respect as well, the gas consumption is reduced and the fuel cost is reduced. .

Further, since the heated air blown out is directed in the vertical direction, the collision on the side surface portion X is softened as compared with the case where the heated air is hit only vertically as is conventionally seen on the upper surface portion Y. Since the film is also relatively thin, generation of armpits, pinholes, craters, etc. is suppressed accordingly.

Furthermore, in the upper surface portion Y as well, the heated air mixes with the fresh air and is restrained by the flow of the fresh air to become a relatively gentle air flow. Moreover, the occurrence of armpits, pinholes, craters, etc. is suppressed accordingly.

In particular, when the ratio of heated air to fresh air is set to 85:15 as in this embodiment, the temperature of the upper surface portion Y is lower than that of the side surface portion X, as can be seen from the measured values shown in FIG. Since the state can be maintained, the occurrence of cracks, pinholes, craters, etc., which are caused by the above-mentioned thick coating film, can be suppressed.

Furthermore, in the past, since a relatively large volume of heated air is blown down from the large opening in the ceiling, turbulence is generated in the coating drying chamber, dust easily rises, and the amount of floating also increases. However, there is a drawback that the adherence rate of dust to the painted surface is high, but according to the embodiment of the present invention, the blow-down from the ceiling portion is reduced and the blowout port 1
Since an appropriate amount of air is blown out from 5, turbulence is less likely to occur, dust is less likely to fly up, and the amount of floating is also reduced, which reduces the adhesion rate of dust to the coated surface,
Also in this respect, the coating quality can be improved.

In another embodiment, the heated air source of the heated air generator 30 in the above embodiment is made into the outside air and the second suction device 50 is not provided.

In the case of this device, it may be operated as shown in FIG. 7 or FIG. 8 during drying.

In FIG. 7, when only the first suction device 40 and the heated air generator 30 are driven and fresh air is taken in by the exhaust fan 43, the action and effect are substantially the same as those of the first embodiment except the point of thermal efficiency. Becomes

Further, in FIG. 8, when only the heated air generator 30 is driven, the blown heated air rises upward due to the high temperature and is discharged from the upper opening 15. However, this heated air is As it rises upward, it hits the side surface portion X and rises so as to wrap around the upper surface portion Y, so that the temperature rise of the side surface portion X is promoted, and the heated air is sufficiently spread to the upper surface portion, so that the upper surface portion Y and the side surface Part X
Both can raise the temperature to the required temperature substantially uniformly.

〔The invention's effect〕

As described above, in the coating dryer according to the present invention,
When coating, only the coating unit (N1) is operated to perform coating, and when drying, the drying unit (N1)
By operating only 2) to perform drying, the environmental conditions for coating and coating drying can be adjusted efficiently in one room.

When the coating unit (N1) is operated during coating, indoor air is sucked through the lower opening (18) and outside air is introduced into the room through the upper opening (15), and a downward airflow from the ceiling to the floor is generated, The paint mist scattered in the room can be discharged to the outside of the room by being placed on the downdraft.

When the drying unit (N2) is activated during coating drying,
The indoor air is sucked through the lower opening (18) and the outside air is introduced into the room through the upper opening (15) in an amount corresponding to the amount of exhaust gas, and the heated air is blown out through the air outlet (13) to be dried (C). The horizontal airflow that blows out toward the side surface of the machine and creates a downward airflow from the ceiling to the floor. The lower surface of the body (C) is dried, the lower temperature is increased, and the upper side is heated by heat conduction through the body to be dried (C) to accelerate the temperature rise of the side surface of the body to be dried (C). It is possible to mix with fresh air from the upper opening (15) and spread it over the upper surface of the dried object (C) to be coated, and thereby the temperature and the air volume of the heated air on the upper surface are adjusted, and the excess air on the upper surface is adjusted. The degree rise can be suppressed,
Further, by adjusting the opening degree of each of the outlets (13) according to the side surface position of the object to be dried (C), the horizontal airflow to be blown can uniformly dry the side surface of the object to be dried (C). Can be adjusted as

With this, a large amount of heated air can be spread to the lower surface of the object to be dried (C) and the object to be dried (C) can be spread by using two air currents of the heated air horizontal flow and the fresh air downward flow. It is possible to circulate the air whose temperature and air volume have been adjusted into the upper surface of the above, so that all of the upper surface, side surface and lower surface of the object to be dried (C) can be raised substantially uniformly to the required temperature. Therefore, the drying speed of the entire surface of the object to be dried (C) can be kept constant, and the entire surface of the object to be dried (C) can be evenly dried. It is possible to prevent the occurrence of such problems as described above and prevent the surface of the coating film from becoming rough, and it is possible to make the coating film quality uniform and improve the coating quality.

For this reason, as an apparatus for performing coating and drying consistently in one room, compared to the conventional apparatus, the dried object (C)
The coating drying can be efficiently performed, the drying time can be shortened, and the cost for coating drying can be effectively reduced. Further, since the outside air is introduced from above and the warm air is extracted from below at the same time, the entire surface of the object to be dried (C) can be uniformly dried. With the apparatus of the present invention, the temperature difference that has occurred twice or more can be eliminated, the deterioration of the coating quality due to the temperature difference can be avoided, and the coating quality can be improved.

Further, when the coating unit (N1) is operated, both the feeding device (20) and the suction device (40) are operated at the time of coating to suck and exhaust air in the coating drying chamber (10) and to perform coating. Introduce outside air into the drying chamber (10),
At the time of subsequent drying, the operation of the coating unit (N1) is stopped and only the drying unit (N2) is operated, and the amount of air corresponding to the exhaust amount in the coating drying chamber (10) is negatively applied to dry the coating. Since it can be introduced into the chamber (10), each unit (N1, N2) can be efficiently operated, and the apparatus can save energy.

Further, when the drying unit (N2) is operated during drying, the blower device (50) and the heated air generating device (3
0) The blower (53) of (0) is started and the heating air of a predetermined temperature is sent toward the side surface of the material to be coated (C) installed in the coating drying chamber (10) from the blower outlet (13). In addition, the air blown by the blower (53) is partially exhausted by the blower (54), and the coating drying chamber (1
Around the object to be dried by adjusting the suction amount of air from 0) and the blowing amount of heated air to the coating drying chamber (10) and newly introducing the insufficient air from the upper opening (15). The temperature and air flow rate can be adjusted with high precision, the entire surface of the object to be coated (C) can be dried uniformly, and the drying time can be shortened.

Further, in the coating drying apparatus according to the present invention, heated air is blown toward the side surface portion (X) of the object to be coated (C) and is equal to the amount of suction air exhausted through the air conditioner (54). A large amount of outside air is forcibly taken into the coating drying chamber (10) from the upper opening (15) of the ceiling portion and mixed with the heated air, whereby the temperature rise of the lower surface portion and the side surface portion is promoted, and the upper surface is increased. By controlling the temperature and air volume of the heated air that reaches the part (Y), the temperature rise of the upper surface part (Y) can be suppressed, and the entire surface of the material to be dried (C) can be raised to the required temperature substantially uniformly. The drying conditions can be substantially the same, and the coating film quality can be made uniform.

Therefore, it is not necessary to extend the drying time for drying the side surface portion (X), and the operating cost can be reduced accordingly.

Therefore, compared to the case where the heated air is vertically applied only to the upper surface portion (Y) as in the conventional case, the heated air rises so as to wrap around the upper surface portion (Y) as a relatively gentle air flow. , The airflow does not vertically collide with the upper surface portion, and it is possible to suppress the generation of cracks, pinholes, craters, etc. on the upper surface portion (Y), and heat the outside air taken in from the upper opening (15) of the ceiling portion. By mixing with the air, the collision of the heated air with the side surface portion (X) is softened, and it is possible to suppress the generation of cracks, pinholes, craters, or the like also in the side surface portion (X).

[Brief description of drawings]

FIG. 1 is a perspective view showing a partially broken and partially disassembled structure of a one-chamber type coating / drying apparatus according to an embodiment of the present invention. FIG. 2 is a plan sectional view showing the operation during drying according to the embodiment. FIG. 3 is a vertical cross-sectional view showing the operation during drying according to the embodiment. FIG. 4 is a vertical cross-sectional view showing the operation during coating according to the embodiment. FIG. 5 is a graph showing an example of a temperature rising state of each part of the automobile C during drying according to the embodiment. FIG. 6 is a side view of the automobile C showing the temperature rise measurement points according to the embodiment. FIG. 7 is another example of the one-chamber type coating / drying apparatus according to the embodiment, and is a vertical cross-sectional view showing the operation when fresh air is taken in during drying. FIG. 8 is another example of the one-chamber type coating / drying apparatus according to the embodiment, which is a vertical cross-sectional view showing the operation when fresh air is not taken in during drying. FIG. 9 is a vertical cross-sectional view showing an example of a conventional one-chamber type coating and drying apparatus together with its operation. B: One-chamber type coating / drying device C: Automotive (drying target) X ... Side part Y ... Top part 10 ... Coating drying chamber 12 ... Duct 13 ... Air outlet 15 ... Top opening 18 ...... Lower opening 20 ...... Sending device 21 ...... Duct (intake duct) 23 ...... Blower fan 30 ...... Heating air generator 40 ...... First suction device 41 ...... Exhaust duct 43 ...... Exhaust fan 50 ... … Second suction device (blower) 51 …… circulation duct 52 …… filter box 53 …… circulation fan (blower) 54 …… air conditioner

Claims (4)

[Claims] 1. An upper opening (15) serving as a vent communicating with the outside air above the article to be dried (C), and a lower opening serving as a vent below the article to be dried (C). 18)
And a coating drying chamber (1) in which a plurality of outlets (13) located on the side of the body to be coated (C) are opened.
0), and the coating drying chamber (10) through the upper opening (15).
A coating unit (N1) for sending the outside air into the interior and sucking the air in the coating drying chamber (10) through the lower opening (18), and the coating drying through the lower opening (18). Room (10)
The air inside is sucked, a part of the sucked air is exhausted to adjust the flow rate, and the air whose flow rate is adjusted is heated, and the air to be dried (C) of the coating object (C) is heated through the blowout port (13). A drying unit (N2) that feeds laterally and sucks the same amount of air as the exhaust air volume into the coating drying chamber (10) from the upper opening (15) through the coating unit (N1).
And a coating and drying device. 2. A feeding device (20) for introducing outside air into the coating drying chamber (10) in the coating unit (N1).
The coating and drying apparatus according to claim 1, further comprising: a suction device (40) for sucking air in the coating and drying chamber (10). 3. The drying unit (N2) supplies heated air to the drying object (C) installed in the coating drying chamber (10) through the air outlet (13). And a blower (50) for feeding the sucked air to the heated air generator (30). The blower (50) filters the sucked air. A filter box (52) having a filter, a blower (53) for feeding the air sucked through the filter box (52) to the heated air generator (30), and the blower (53) The coating drying apparatus according to claim 1, further comprising an air conditioner (54) for partially exhausting the air to adjust the flow rate. 4. An outlet (13) which is located on the side of the article to be dried (C) arranged indoors and blows heated air toward the side of the article to be dried (C), and a ceiling. Upper opening (15) opened on the floor and lower opening (1 on the floor
8), a coating drying chamber (10), a feeding device (20) for feeding outside air into the coating drying chamber (10) from the upper opening (15), and the lower opening (18) to the A suction device (40) for sucking air in the coating and drying chamber (10), and the air outlet (1) sucked from the lower opening (18).
3) A heating air generator (30) for heating and raising the temperature of the air sent to the air, and the air sucked from the lower opening (18) through the heating air generator (30) to the outlet (13). A blower (53) for feeding to the heating air generator (30) and a blower (54) for adjusting a flow rate by exhausting a part of the air introduced from the blower (53) to the heated air generator (30). A coating drying device characterized in that