JP2001321712A - Coating/drying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem such that when an object coated with a water base coating is dried by a conventional coating/drying apparatus, a long drying time is necessary, and bubbles and coating nonuniformity are generated on a coated surface. SOLUTION: A coating/drying apparatus is composed of a coating/drying chamber 1 for housing the object 2 to be coated, a hot air generating means 5 for supplying air of room temperature and hot air selectively into the chamber 1, a discharge means 6 for discharging the air in the chamber 1, and a hot air ejection means for ejecting hot air toward the object 2, so that even the object 2 coated with the water base coating can be dried in a short time, and the bubbles and the coating nonuniformity is scarcely generated on the coated surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating and drying apparatus for coating and drying an object to be coated such as a vehicle body or a vehicle part.

[0002]

2. Description of the Related Art Conventionally, most vehicle bodies and vehicle parts are painted with a paint using an organic solvent. In addition, since the paint using an organic solvent can be dried for a short period of time, conventionally, hot air is blown from the ceiling of the paint drying chamber, or an electrical drying device such as an infrared heater is used to paint the surface of the workpiece. However, in recent years, the use of water-soluble paints to paint the body, vehicle parts, and the like has been increasing because organic solvents have a bad influence on the environment.

[0003]

However, in a conventional coating and drying apparatus for drying an object coated with a coating material using an organic solvent, there is almost no wind speed near the surface of the object and a high temperature of about 80 ° C. Because the painted surface is dried with
When the object coated with the water-soluble paint is dried, there are problems such as bubbles and uneven coating being generated on the coated surface, and a good coated surface cannot be obtained. Also, precision machine parts, etc.
Since there are many specifications that cause failure when exposed to high temperatures, there is also a need for drying at 60 ° C. or less.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is capable of efficiently and quickly drying an object to be coated such as a vehicle body or a vehicle part, which is coated with a water-soluble paint, for protecting precision equipment. It is another object of the present invention to provide a coating and drying apparatus that does not generate air bubbles or uneven coating on a coating surface.

[0005]

According to the first aspect of the present invention, there is provided a coating and drying chamber for accommodating an object to be coated, and selectively supplying room temperature air and hot air to the coating and drying chamber. The apparatus comprises a hot air generating means, an exhaust means for discharging air in the coating and drying chamber, and a hot air blowing means installed in the coating and drying chamber and blowing hot air toward an object to be coated.

[0006] With the above structure, even if the object is coated with the water-based paint, the evaporation of moisture during the coating is promoted by the hot air blown to the coating surface of the object by the hot air blowing means. It is possible to dry in a short time, thereby improving the productivity and preventing the occurrence of air bubbles and uneven coating on the coated surface, thereby preventing defective coating and the like.

According to a second aspect of the present invention, there is provided a hot air blowing means, comprising: a hot air duct provided at a corner of an upper part of a coating and drying chamber; It is composed of a large number of blowing nozzles for blowing toward.

With the above structure, when a large object to be coated is accommodated in the coating and drying chamber, the space in the coating and drying chamber can be effectively used, for example, the hot air blowing means does not become a hindrance. Since hot air can be uniformly blown from the nozzle to the coating surface of the object to be coated, the object to be coated can be efficiently dried.

According to a third aspect of the present invention, a filter for removing dust and the like in hot air blown from a blowing nozzle is provided in a hot air duct.

[0010] According to the above configuration, dust and the like in the hot air do not adhere to the painted surface, so that a painted surface of good quality can be obtained.

[0011]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the front side of a paint drying room,
FIG. 2 is a side sectional view, and FIGS. 3 and 4 are operation explanatory diagrams.

In these figures, reference numeral 1 denotes a coating and drying chamber for coating and drying an object 2 to be coated such as a car body or a vehicle part, and a front wall 1a having a front opening and a loading / unloading port 3 for the object 2 to be coated, and both side walls. 1b, a rear wall 1c, a ceiling 1d, and a floor 1e, and has a sufficient capacity to accommodate a large object to be coated 2 such as a car body, and the opening / closing port 3 is openable and closable. A door 4 is provided so that the inside can be sealed.

In the vicinity of the coating and drying chamber 1, a hot air generating means 5 for supplying hot air at a predetermined temperature, for example, about 50 ° C., into the coating and drying chamber 1, and exhausting the air in the coating and drying chamber 1 to the atmosphere. Exhaust means 6 is installed so as to face the coating and drying chamber 1.

The hot air generating means 5 includes an air inflow passage 5b having an air intake opening 5a at an upper portion thereof, a filter 6 installed in the middle of the air inflow passage 5b to remove air dust, and a motor. It comprises a blower 7 such as a blower driven by a drive source 8 and a heating means 9 such as an oil burner or a gas burner installed on the discharge side of the blower 7, and the hot air heated by the heating means 9 is supplied to an air passage. 5
c, the ceiling air dam 10 installed on the paint drying room 1
Is supplied to the

The ceiling air dam 10 is installed so as to cover almost the entire surface of the ceiling 1 d of the coating and drying chamber 1.
Hot air is blown into the coating and drying chamber 1 from a hot-air outlet 1f opened to the hot air outlet 1d, and a ceiling filter 12 is attached to the hot-air outlet 1f. Fine dust and the like are removed.

On the other hand, on both sides of the upper part of the coating and drying chamber 1. A hot air duct 13 having a triangular cross section is formed by diagonally dividing an upper portion of both side walls 1b and the ceiling 1d by a partition wall 1g, and a hot air supply fan 15 is provided in the hot air duct 13. The hot air in the ceiling air dam 10 is supplied. On the indoor side surface of the partition wall 1g, a number of blowing nozzles 16 for blowing hot air supplied into the hot air duct 13 toward the workpiece 2 are projected obliquely downward and inside the partition wall 1g. In
A filter 17 for removing fine dust and the like in the hot air blown from the blow nozzle 16 is provided.

The floor 1e of the coating and drying chamber 1 is provided with an exhaust port 1h on which a perforated plate 18 such as a grating is attached, and the exhaust port 1h is provided below the floor 1e. It is connected to the exhaust means 6 through a passage 19. The exhaust means 6 has a blower 21 such as a blower which is driven by a drive source 20 such as an electric motor to suck air in the coating and drying chamber 1. The air sucked by the blower 21 is exhausted by an exhaust duct. A filter 23 is installed between the exhaust passage 19 and the air blower 21 to remove paint mist and the like in the air exhausted from the interior of the paint drying chamber 1. In addition, 24 in FIG.
Indicates a bypass valve.

Next, the operation of the coating and drying apparatus constructed as described above will be described with reference to FIGS. In this coating and drying apparatus, a coating step of the object to be coated 2 is performed by a water-based paint manually by an operator entering the coating and drying chamber 1, and the drying step is performed by hot air. In carrying out the coating step, first, the article 2 to be coated is loaded into the coating and drying chamber 1 through the loading and unloading opening 3 opened in the front wall 1a, and then the door 4 is closed to seal the inside of the coating and drying chamber 1.

Next, the blower 7 is driven in a state where the heating means 9 provided in the hot air generating means 5 is turned off to supply room-temperature air to the ceiling air dam 10, and a hot air outlet opening in the ceiling 1d. While blowing air at a normal temperature into the coating drying chamber 1 from 1f, the worker manually coats the workpiece 2 with air.

During the painting operation, the exhaust fan 21 of the exhaust means 6 is used.
Is driven to discharge the air in the coating and drying chamber 1 to the atmosphere, so that fresh air always flows through the coating and drying chamber 1 as shown in FIG. Because it discharges, a comfortable working environment is obtained and workability is improved, and paint mist generated during the painting process is
Since it is not removed by the filter 23 provided in the exhaust means 6 and released into the atmosphere, there is no concern about deteriorating the environment.

When the painting process is completed as described above,
After the worker comes out of the paint drying chamber 1, the process proceeds to the drying step. In the drying step, the blower 7 is driven in a state where the heating means 9 of the hot air generation means 5 is turned on, and the hot air heated to a predetermined temperature by the heating means 9 is supplied to the ceiling air dam 10,
At the same time as blowing hot air into the coating and drying chamber 1 from a hot air blowing port 1f opened in the ceiling 1d, a hot air supply fan 15
Also drives the hot air in the ceiling air dam 10 into the hot air duct 1
Supply into 3.

As a result, as shown in FIG. 4, the hot air in the hot air duct 13 is blown out from a number of blow-out nozzles 16 toward the coating surface of the work 2 to be coated. ° C, wind speed about 0.5m / sec
Since the heating temperature and the wind speed are set so that hot air is supplied, the evaporation of water during the coating is promoted even when the water-based coating is used, so that it can be dried in a short time.
Almost no coating unevenness occurs.

During the drying process, the exhaust fan 21 of the exhaust means 6
Is driven to suck the hot air in the paint drying chamber 1 through the exhaust port 1h and the exhaust passage 19, and to exhaust the hot air from the exhaust duct 22 to the atmosphere, and to dry the workpiece 2 using the water-based paint. There is no fear that the organic solvent evaporated during drying is discharged to the atmosphere by the exhaust means 6 together with the hot air in the coating and drying chamber 1.

In the above-described embodiment, a case has been described in which an operator enters the coating and drying chamber 1 and manually paints the object 2 to be coated. However, a coating nozzle and the like are installed in the coating and drying chamber 1. Of course, even if you do the painting automatically,
A conventional coating device can be used as it is for the coating nozzle and the like.

The object 2 to be coated is not limited to a vehicle body or a vehicle part, but can be applied to all objects to be coated and coated with a coating using an organic solvent. Of course, it can also be used for drying a painted product.

[0026]

As described in detail above, the present invention provides a coating and drying apparatus comprising: a coating and drying chamber for accommodating an object to be coated; and a hot air generating means for selectively supplying room temperature air and hot air to the coating and drying chamber. And an exhaust means for discharging the air in the paint drying chamber, and a hot air blowing means installed in the paint drying chamber and blowing hot air toward the object to be coated, so that the paint is applied using an aqueous paint. Even the coated object is dried in a short time because the hot air blown from the hot air blowing means onto the coated surface of the object promotes the evaporation of moisture during coating. In addition to improving the performance, no bubbles or uneven coating are generated on the coated surface, so that defective coating or the like can be prevented. Further, the hot air blowing means is constituted by a hot air duct provided at a corner portion of the upper part of the coating drying chamber and a number of blowing nozzles for blowing the hot air supplied to the hot air duct toward the object to be coated. When storing large objects to be coated, the hot air blowing means does not become an obstacle, making it possible to effectively use the space in the coating drying room and to make the coating surface of the object to be coated uniform from multiple blowing nozzles Since hot air can be blown on the object, the object to be coated can be efficiently dried. In addition, a filter that removes dust and the like in the hot air blown out from the blowing nozzle is provided in the hot air duct, so that dust and the like in the hot air do not adhere to the painted surface. Will be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a coating and drying apparatus according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the paint drying apparatus according to the embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of the coating and drying apparatus according to the embodiment of the present invention at the time of coating;

FIG. 4 is an explanatory diagram of an operation at the time of drying of the coating and drying apparatus according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Coating drying room, 2 Coating object, 5 Hot air generation means, 6 Exhaust means, 13 Hot air duct, 16 Blow-out nozzle, 17 Filter

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3L113 AB02 AC04 AC47 AC64 AC83 BA33 CA08 CA11 DA24 4D073 AA01 BB03 DD08 DD14 4F042 AA09 DB04 DB33 DB36 DB37

Claims (3)

[Claims] 1. A paint drying chamber (1) for accommodating a workpiece (2).
Hot air generating means (5) for selectively supplying room temperature air and hot air into the paint drying chamber (1), and exhaust means (6) for discharging air from the paint drying chamber (1), A coating and drying apparatus comprising: a hot-air blowing unit that is installed in the coating and drying chamber (1) and that blows hot air toward the object to be coated (2). 2. A hot air blowing means, comprising: a hot air duct (13) provided at a corner of an upper portion of a coating and drying chamber (1); and hot air supplied to the hot air duct (13) to an object (2) to be coated. 2. The coating and drying apparatus according to claim 1, comprising a plurality of blow-off nozzles (16) for spraying the spray toward the paint blower. 3. A blowing nozzle (16) in a hot air duct (13).
A filter that removes dust and the like in the hot air that is blown out
The coating and drying apparatus according to claim 2, further comprising (17).