JPS5849788B2 - Paint drying baking furnace equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paint drying and baking oven apparatus for drying and baking a paint applied to an automobile body or the like in a hot air oven and then cooling the coated object such as an automobile body.

Paint drying and baking oven equipment for drying and baking painted objects generally has a cooling chamber adjacent to the drying and baking chamber, in order to facilitate handling of the painted objects in the post-process. It is partitioned off with a curtain (Japanese Publication No. 45-6078, Japanese Patent Publication No. 47-18931).

In the conventional paint drying and baking furnace apparatus for automobile bodies, etc., the outlet air curtain section of the furnace chamber and the cooling chamber for cooling the painted object are each independent.

This conventional example will be explained with reference to FIGS. 1 and 2.

One person is at the outlet of the furnace chamber of the paint drying and baking furnace equipment, and the car body to be painted is located in the furnace's effective zone IAi from the left to the right in the figure.
From there, it is transported to the air curtain chamber 1A2, but the inside of the furnace and the outside air are shut off at the air curtain chamber IA2 at the end of the furnace chamber.

Thereafter, the painted automobile body is further conveyed from the outlet air curtain chamber 1A2 to the cooling chamber 3 via the exhaust hood chamber 2.

As shown in FIG. 1, the outlet air curtain chamber TA2 shuts off the inside of the furnace and the outside air by sucking air blown out from the blow-off port 5 through the blow-off duct 4 into the suction port 6. It forms an air curtain.

The air sucked in through the suction port 6 is guided to the circulation fan 9 via the suction duct 7 and duct 8, and then introduced into the blow-off duct 4 again through the ducts 10 and 12, and is blown out from the blow-off port 5.

During this cycle, some surplus air flows into the duct 11.
The paint is led to a purification device (not shown) through the paint, and organic substances such as resins and organic solvents constituting the paint are removed, and then released into the atmosphere.

The capacity of the circulation fan 9 in this case is usually 300 m'
,/min, and the displacement from the duct 11 is 100 m/min.

The next exhaust hood room 2 is designed to direct the air leaking from the air curtain room 1A2 into a duct 13 in order to prevent the above-mentioned paint organic substances leaking from the air curtain room 1A2 from condensing and adhering to the cooling room 3 and the workplace. , an exhaust fan 14, and a duct 15 to a purification device (not shown).

In this case, the capacity of the fan 14 is normally 250 m, and the displacement is also 250 m7.

In the next cooling chamber 3, a single person in the paint drying and baking oven cools the painted car body heated by hot air to around room temperature.In this case, a large amount of cold air (outside air) is blown onto the painted object. Cooling is in progress.

That is, duct 1 6A, 1 6B, 1 6C1 air supply fan 1 7A, 1 7B, 1 7C1 duct 1 8A, 1
The air introduced into the blow-off duct 19 through the blow-off ports 8B and 18C is blown as cold air onto the heated coating object through the blow-off port 20, and after cooling it, is sucked into the suction duct 22 through the suction port 21, and then into the suction duct 22 through the suction port 21. , 23B1 exhaust fan 2
4A, 24B1 and ducts 25A, 25B, the paint is sent to a purification device (not shown), and after organic substances in the paint are removed, it is released into the atmosphere.

In this case, the normal air supply fan capacity is 450,771 liters per unit.
/min, and the exhaust fan capacity is 750 m''/min per unit.

In this way, in the conventional paint drying and baking oven device, the air curtain section 1A2, the exhaust hood chamber 2, and the cooling chamber 3 each take in and exhaust outside air independently, and for this reason, a large amount of air is required. A large amount of air containing harmful paint organic substances is discharged at a rate of 1,850m.

As a result, the paint drying and baking furnace itself becomes larger, which not only causes a rise in equipment and operating costs, but also
This increases the size of purification equipment that processes large amounts of exhaust gas, and increases equipment and operating costs.

The present invention has been made in order to eliminate the drawbacks of the prior art, and aims to improve the cooling efficiency of painted objects, reduce the amount of harmful exhaust air, and downsize exhaust gas treatment equipment.
An object of the present invention is to provide a paint drying and baking furnace device that can reduce leakage of high-temperature air into a cooling chamber.

The present invention provides a furnace chamber formed by refractory walls surrounding the top, bottom, left and right sides, an entrance and exit provided at both lengthwise ends of the furnace chamber, and a conveyor for continuously transporting the coated material from the entrance to the exit of the furnace chamber. a hot air device for circulating hot air within the furnace chamber; an air curtain section provided at the inlet and outlet of the furnace chamber; and an air curtain section provided adjacent to the air curtain section provided at the outlet of the furnace chamber. In a paint drying and baking furnace apparatus having a cooling chamber for blowing cooling air onto the coated article, an opening through which the coated article passes through a central part that partitions an air curtain section provided at an outlet of the furnace chamber and the cooling chamber. a water cooling device provided in the cooling chamber for cooling the air blown into the cooling chamber, and introducing the air blown into the cooling chamber into the air curtain section of the outlet section as air curtain air. The air blown into the cooling chamber is cooled by a water cooling device to improve the cooling efficiency of the painted object, and the air blown into the cooling chamber is used as an air curtain to reduce harmful air emissions. This structure reduces the amount of high-temperature air leaking from the furnace chamber to the cooling chamber by using a partition plate, thereby reducing the size of the exhaust gas treatment equipment.

A preferred embodiment of the present invention will be described with reference to FIGS. 3, 4, and 5.

In Figure 3.4.5, the outlet air curtain part IC1
The effective zone 1B of the furnace chamber of the paint drying and baking oven device is isolated from the outside air, and the painted automobile body 59 that has finished drying and baking the paint is transported to the left side of the figure by a conveyor 58 running on a conveyor rail 57. It is conveyed to the right from the air curtain section 1C1 and enters the cooling section 1 which is a cooling chamber.
It is cooled by cold air at c2.

The cooling unit 1C2 is equipped with a water cooling device that lowers the temperature of the cold air in order to increase the cooling effect with a small volume of cold air.

That is, the cold water introduced from the water supply pipe 54 cools the air blown onto the automobile body 59 through the cooling water pipe 42, and then is discharged through the drainage pipe 55.

On the other hand, outside air is introduced into the blow-off duct 40 via the duct 43, the air supply fan 44, and the duct 45, and is blown out from the blow-off port 41. After being cooled by the cooling water pipe 42 provided in front of the blow-off port 41, and cools it.

In this case, the air volume of the air supply fan 44 is 300 m8/min.

The air that has cooled the automobile body 59 is sucked in through the suction port 30A1 of the cooling unit IC2, and passes through the introduction device duct 46, fan 47A1, and duct 48 to the air curtain outlet duct of the air curtain unit 1c1.
27A, blows out from the air outlet 28A, forms a first air curtain, and flows into the suction duct t'2 from the air inlet 30B.
It gets sucked into 9B.

This air curtain can block the exhaust gas containing paint organic substances in the effective zone 1B of the furnace chamber from leaking to the outside, but in order to make this block more complete, it is recommended to provide a second air curtain. .

That is, the air sucked into the suction duct l'29B from the suction port 30B is transferred from the suction duct 29B through the duct 49, the fan 47B1 duct 50, and the blowout duct 27B to the blowout port 2.
The air is blown out from 8B, and this blown air is further passed through the suction port 30C.
It is desirable that the second air curtain be formed by being sucked into the suction duct 29C.

The air that forms this second air curtain and is sucked in from the suction port 30C passes through the suction duct 29C1, the duct 51, the exhaust fan 52, and then is sent from the duct 53 to a purification device (not shown), where it is purified and then released into the atmosphere. be done.

The capacities of the fans 47A1, 47B1, and 52 in this embodiment are 350 m7 min, 400 m''/min, and 450 doors/min, respectively.

Furthermore, between the effective zone 1B and the air curtain part 1c1,
Between the air curtain section 1c1 and the cooling section 1C2, partition plates 56A and 56B each having an opening in the center are provided so that a painted automobile body can pass through, and the partition plates 56A and 56B have an air curtain effect and The structure is such that the cooling effect is further improved.

That is, the paint organic substances that evaporate from the automobile body, which is the painted material that has entered the outlet air curtain section 1C1, are collected at the upper part of the outlet air curtain section IC1 because the temperature is at the temperature of the automobile body. Cooling section 1C2
The amount of leakage to the outside can be significantly reduced.

Moreover, not only can the hood compartment that was previously required be eliminated, but the air blown into the cooling section is cooled by a water cooling device to reduce the amount of air used, and the air blown into the cooling section can be used as an air curtain. , the final exhaust gas (exhaust air) volume was reduced to about 450 m' of the conventional method,
It can be reduced to 'minutes.

Therefore, it is possible to downsize the paint drying and baking furnace device and reduce operating costs, and by reducing the amount of exhaust gas, it is possible to downsize the exhaust gas purification device and reduce processing costs.

As explained above, according to the present invention, it is possible to improve the cooling efficiency of dry-baked painted objects, reduce the amount of harmful exhaust air, downsize the exhaust gas treatment equipment, and reduce the size of the exhaust gas treatment equipment. The leakage of hot air from the air to the cooling room can be reduced.

[Brief explanation of the drawing]

Figure 1 is a plan view of the outlet air curtain chamber, hood chamber, and cooling chamber of a conventional paint drying and baking oven apparatus. Figure 2 is a side view of Figure 1, with arrows indicating the direction of travel of air or exhaust gas. show. FIG. 3 is a plan view of the air curtain section and the cooling section of the paint drying and baking furnace apparatus according to the embodiment of the present invention, FIG. 4 is a side view of FIG. 3, and FIG. - A cross-sectional view taken along the V line, where solid arrows indicate the direction of travel of air or exhaust gas, and dotted arrows indicate the direction of travel of water. IA1, IB... Effective part of paint drying baking furnace, 1
A2...Air curtain room, 2...Hood room, 3...Curved cooling room, IC1...Air curtain section, 1C2゜゜゛゜゜゜cooling section, 42...
・Cooling water pipe, 56A, 56B...Partition plate,
41, 28A, 28B...Air outlet, 30
A, 30B, 30C...Air suction port, 59.
...Painted objects (automobile bodies).

Claims (1)

[Claims] 1. A furnace chamber formed by fireproof walls surrounding the top, bottom, left and right, entrances and exits provided at both lengthwise ends of the furnace chamber, and a conveying device that continuously transports the coated material from the entrance to the exit of the furnace chamber;
A hot air device that circulates hot air in the furnace chamber, an air curtain section provided at the inlet and outlet of the furnace chamber, and the painted object provided adjacent to the air curtain section provided at the outlet of the furnace chamber. In a paint drying and baking furnace apparatus having a cooling chamber for blowing cooling air into the furnace chamber, an opening through which the painted object passes is formed in a central part that partitions the cooling chamber from an air curtain section provided at the outlet of the furnace chamber. a partition plate, a water cooling device provided in the cooling chamber that cools the air blown into the cooling chamber, and an introduction device that introduces the air blown into the cooling chamber into the air curtain section of the outlet section as air curtain air. A paint drying and baking furnace device characterized by being provided with.