JP2527822B2 - Heating and cooling equipment in the painting process - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heating and cooling device in a coating process.
More specifically, the present invention relates to a heating and cooling device that forms a hot air circulation region and a cold air circulation region by utilizing high-speed rotating flow of high-pressure air.

[Prior Art] In recent years, due to the need to regulate pollution, particularly photochemical smog, it is desired to completely separate and recover the evaporating organic solvent without discharging it to the outside of the process, that is, outside the coating apparatus in the coating process using the organic solvent paint. ing. However, in the painting process of large-scale works such as automobile bodies, not only is the equipment large and the economic burden on the equipment large, but it is difficult to say that it is a drastic measure. Has been done.

By the way, it is extremely difficult to control the spontaneous evaporation rate of the solvent in the water-based paint by changing the boiling point of the solvent, as compared with the organic solvent paint.

Therefore, in the natural evaporation type, the flash-off process becomes long, resulting in larger equipment and uneven quality.
Conventionally, for example, as shown in Japanese Examined Patent Publication No. 52-30170 and Japanese Utility Model Laid-Open No. 61-3395, a radiant heating method, or Japanese Unexamined Patent Publication No.
A countermeasure for positively heating the work is taken by the induction heating method or the like disclosed in Japanese Patent Laid-Open No. 242378.

[Problems to be Solved by the Invention] However, in any of the above structures, it is inevitable that the equipment becomes complicated and large. In addition, the method of convection contact with hot air is
Although it can be dried more uniformly than the above-mentioned radiant heating method, the problem of increasing the size and increasing the equipment cost remains due to the addition of explosion-proof measures for the hot air generator.

In addition, since both of them are positively heated, they achieve the intended purpose in terms of solvent evaporation, but introducing a work piece whose temperature has risen to the next step may cause poor coating film quality in the next step. Become. In particular, in the case of a clear coating process in which the next process is still an organic solvent paint, it is inconvenient in temperature control, and quality assurance is compromised.
For this reason, a considerable length of cool zone has to be provided, so that the flash-off process is not necessarily shortened sufficiently. It is also difficult to practically use special cooling equipment.

The present invention has been made in view of the above circumstances, and an object thereof is a facility that can cool to an optimum temperature in the next step while rapidly evaporating a solvent by positive convection heating, and has a small size, low cost, and high thermal efficiency. It is to provide a heating and cooling device in a painting process.

[Means for Solving the Problems] The present invention achieves the above object by adopting a configuration in which hot air and cold air are generated by a high-speed rotating flow action of high-pressure air to perform solvent evaporation and work cooling.

That is, a heating / cooling chamber is provided between the pre-stage process and the post-stage process of the coating process, and is composed of a main body tube having a high-pressure air supply port, a hot air discharge port, and a cold air discharge port. A hot / cold air generator for generating hot air and cold air by the high-speed rotary flow action of is disposed close to the heating / cooling chamber, and directs hot air from the hot air outlet to the upstream side or the downstream side of the heating / cooling chamber and It is characterized in that the cold air from the cold air outlet is guided to the downstream side or the upstream side to form a hot air circulation area and a cold air circulation area in the heating and cooling chamber.

[Operation] In the present invention, the heating / cooling chamber is provided, for example, between the pre-stage process of colored coating and the post-stage process of clear coating, for example. Then, if hot air is generated by arranging a hot / cold air generator so as to form a hot air flow area on the upstream side of the heating / cooling chamber and a cold air flow area on the downstream side, the hot air flow area is discharged from the preceding step in the hot air flow area. The solvent can be quickly evaporated from the coating film on the work, and the heated work can be quickly cooled to the optimum temperature for the subsequent process in the cold air distribution area. Therefore, quick flash-off and high-quality painting can be performed.

Embodiments Embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is an overall configuration diagram, and FIG. 2 is a configuration diagram of a hot / cold air generator.

As shown in FIG. 1, the heating / cooling device of the present embodiment is arranged such that a vehicle body (workpiece) is accelerated between a colored coating process (first stage process) Z1 and a colorless (clear) coating process (second stage process) Z2 to accelerate solvent evaporation. ) W is heated and then used to cool it to a desired temperature in a subsequent step.

Colored painting process Z1 is a process of automatically painting with water-based paint in a painting booth consisting of air supply chamber 3, colored painting chamber 1 and exhaust treatment chamber 4, and colorless painting process Z2 is air painting chamber 3, colorless painting chamber. 2. This is a process of automatically applying an organic solvent paint or a water-based paint in a paint booth consisting of the exhaust treatment chamber 4. Z12 is executed in the heating / cooling chamber 10 in the heating / cooling process.

The heating / cooling chamber 10 of this embodiment is composed of an upper chamber 11, a middle chamber 13, and an exhaust treatment chamber 16, and the upper chamber 11 has a hot / cool air generator 20.
Is provided, and a hot air flow zone HZ is formed on the upstream side of the middle chamber, and a cold air flow zone CZ is formed on the downstream side. The exhaust treatment chamber 16 is maintained at a negative pressure by an exhaust fan (not shown). The middle chamber 13 serves as a substantial heating / cooling chamber. 12 is a partition, 14 is a partition, 15
Is the floor.

Here, the hot and cold air generator 20 is the main tube of high pressure air.
It is a special one that generates hot air HB and cold air CB by utilizing the high-speed rotary flow action in 21.

In FIG. 2, reference numeral 21 denotes a cylindrical main body tube 21, which is provided with a high-pressure air supply port 23 and a cold air discharge port 26 at one end side thereof, and is provided with a hot air discharge port 24 at the other end side thereof. . Reference numeral 22 denotes a vortex flow generation chamber, which has a role of generating a vortex flow by using the energy of the high-pressure air HPA ejected from the supply port 23 through the nozzle 22A.

Further, 25 is a control valve, and the hot air HB amount and the cold air CB
It is a means for adjusting the flow rate ratio to the quantity.

That is, the high-pressure air HPA from the supply port 23 becomes the nozzle 22A.
Is tangentially discharged to the periphery of the vortex flow generating chamber 22 at the speed of sound and adiabatically expands, and at the same time, a high-speed rotation flow is made to proceed outside the main body tube 21 in the arrow X1 direction. Therefore, a large centrifugal force acts on the outer vortex and the pressure and density rise sharply to increase the resistance, that is, adiabatic compression raises the temperature. The hot air HB is discharged from the hot air outlet 24 to the outside. On the other hand, the residual air that is prevented from being discharged by the control valve 25 advances in the direction of arrow X2 while rotating in the same direction as the outer vortex inside the inner cavity created by the centrifugal force of the outer vortex. This inner vortex works as a braking action on the outer vortex, so that the temperature drops and becomes cold air CB. In terms of energy, when the supplied high-pressure air HPA is used as a reference, the amount of heat carried by the hot air HB and the cold air CB
Is the same as the amount of heat taken away.

The flow rate and temperature of the hot air HB are adjusted by the control valve 25, and the flow rate and temperature of the cold air CB are also determined correspondingly.

For example, the total length is about 300 mm and the inner diameter of the main body tube 21 is 18 m.
m, and supply high pressure HPA of 7Kg / cmg, 21 ℃ from supply port 23 to 1,40
Supplying only 0 N / min. And adjusting the control valve 25 so that the ratio of hot air HB to cold air CB is 1: 1, the hot air HB becomes 71
℃ and cold air CB becomes -34 ℃.

Here, the high pressure air HPA is the structure of the main body tube 21,
Although it depends on the supply flow rate and the like, the point is that the pressure can be ejected from the nozzle 22A at a speed equal to or higher than the sonic velocity. For example, 1 kg / cmg may be used.

Therefore, in this embodiment, the heating / cooling chamber 10 (middle chamber 1
3) The hot air flow zone HZ is on the upstream side and the cold air flow zone CZ is on the downstream side.
To form the hot and cold air generator 20 as shown in FIG.
Are arranged in the upper chamber 11 in such a manner that the hot air exhaust port 24 is directed upstream and the cold air exhaust port 26 is directed downstream. A compressor 33 with a buffer tank is connected to the high-pressure air supply port 23 via a pipe 43 (flow rate adjusting valve 43A), and a hot air discharge port 24 is connected to a blowing port 44 (heating machine 4 by a duct 34).
0) is connected. On the other hand, a blow port 46 (cooling machine 41) is connected to the cool air discharge port 26 via a duct 36.

Further, a bypass pipe 47 with a valve 37 is provided between the pipe 43 and the duct 36 in order to adjust the blowing temperature of the cold air CB to about 10 ° C., for example. By the mixing action, the cold air temperature in the cold air distribution area CZ can be adjusted.

In this embodiment, the hot / cold air generator 20 is installed in the heating / cooling chamber.
Three units are arranged in parallel in 10 lateral directions (directions perpendicular to the paper surface in FIG. 1), but the number can be selected as appropriate. Depending on this number, the ducts 34, 36 may be pipes.

 Next, the operation will be described.

Solvent property of colored paint, heat capacity of work W, conveying means 5
The hot air temperature in the hot air distribution area HZ is
Adjust control valve 25 to 75 ° C. Also,
The flow rate adjusting valve 43A and the control valve 25 are readjusted in order to adjust the flow rate appropriately. Similarly, the valve 37 is adjusted so that an appropriate flow velocity in the cold air flow zone CZ and a temperature of, for example, 5 to 15 ° C. are obtained.

Then, when the color-coated work W is transferred by the transporting means 5 from the color-coating zone Z1 which is the previous step to the hot-air flow zone HZ of the heating / cooling zone Z12, it is positively heated by the hot air, so that the solvent is rapidly evaporated. It

After that, in the cold air distribution area CZ, the cooling is actively performed this time, so that it is rapidly cooled to the optimum temperature required in the colorless coating zone Z2 which is the latter step. Therefore, the solvent evaporation and the work W (coating) cooling can be performed in a short time.

Therefore, according to this embodiment, the heating / cooling chamber 10 (13) forming the heating / cooling step Z12 is provided between the preceding step (Z1) and the subsequent step (Z2), and the high-speed rotation flow of the high-pressure air HPA is increased. A hot / cold air generator 20, which generates hot air HB and cold air CB by action, is disposed close to each other, and a hot air distribution area is provided on the upstream side thereof.
Since HZ and the cold air distribution area CZ are formed on the downstream side,
Since solvent evaporation after the first step (Z1) and subsequent work cooling can be performed in a short time, a commercial grade coating process can be established with a water-based paint, and the coating zone can be dramatically shortened and miniaturized.
Also, the thermal efficiency is high.

In addition, the hot and cold air generator 20 is new and has a simple structure due to the high-speed rotation and flow action of the high-pressure air HPA, so it does not require explosion-proof measures compared to each conventional heating method, and is compact, low-cost and exceptionally cool. Cooling can be performed without providing any means.

Further, since concrete heating and cooling are so-called convection methods, heating and cooling can be performed more uniformly than conventional radiation methods.
From this point as well, quick and high-quality painting is possible.

Furthermore, since the heat source is high-pressure air HPA, compressed air that is always available in the factory can be used, and the equipment can be further simplified.

(Second Embodiment) FIG. 3 is an overall configuration diagram showing a second embodiment, and FIG. 4 is a diagram for explaining the arrangement of heating / cooling machines as seen from the side of the color coating chamber.

In this embodiment, the heating machine 40 and the cooling machine 41 are arranged above the inner chamber 13 to form the downflow in the first embodiment, while the heating machine 40 is arranged above the upper heating machine 40U (the blowing port). 44U) and a pair of side heating machines 40S (blow-off ports 44S) arranged on both sides are distinguished from each other, and hot air HB is blown toward the work W. Cooling machine
The same applies to 41 [upper cooling machine 41U (blowing port 46U), side cooling machine 41S (blowing port 46S)].

Therefore, in this second embodiment, in addition to the same operational effects as in the case of the first embodiment, the hot air HB and the cold air CH are also blown directly onto the work W, so compared with the case of the first embodiment. Thus, the solvent evaporation and the subsequent cooling can be performed more rapidly, and the hot and cold air generator 20 and the like can be downsized.

[Advantages of the Invention] The present invention provides a heating / cooling chamber between a first step and a second step, and a high-speed rotating fluidized hot / cold air generator for high-pressure air is disposed closely to guide hot air and cold air from now on. Since a hot air flow area is formed on the upstream side (downstream side) of the heating / cooling chamber and a cold air flow area is formed on the downstream side (upstream side), conventional equipment such as large equipment, high cost, non-uniform heating, explosion-proof measures, etc. It is possible to provide a heating / cooling device which eliminates defects, achieves downsizing and cost reduction of the coating process, improves coating film quality, and has high thermal efficiency.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention, FIG. 2 is a configuration diagram of the same hot / cold air generator, FIG. 3 is an overall configuration diagram showing a second embodiment, and FIG. It is a figure for demonstrating arrangement | positioning of the heating / cooling machine seen from the coating room side. 10 …… Heating / cooling room, 20 …… Hot and cold air generator, 21 …… Main body tube, 23 …… High pressure air supply port, 24 …… Hot air exhaust port, 26 …… Cold air exhaust port, 33 …… Compressor.

Claims (1)

(57) [Claims] 1. A main body of high pressure air supplied, comprising a main body tube having a high pressure air supply port, a hot air discharge port and a cold air discharge port, provided with a heating / cooling chamber between a first stage process and a second stage process of a coating process. A hot / cold air generator that generates hot air and cold air by a high-speed rotating and flowing action in the tube is disposed close to the heating / cooling chamber, and hot air from the hot air outlet is provided upstream or downstream of the heating / cooling chamber. A heating and cooling device in a coating process configured to guide and direct the cold air from the cold air outlet to the downstream side or the upstream side to form a hot air circulation region and a cold air circulation region in the heating and cooling chamber.