JP2001029852A - Coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent coated material without making the inside of a coating booth dirty due to the scattering of coating material mist. SOLUTION: This device is provided with a spraying means 1 for spraying the coating material mist 2 downward, a holding means 4 for holding a material 3 to be coated to locate below the spraying means 1 in order to spray the coating material mist 2 from the spraying means 1 on the material 3 to be coated and a receiving means 7 provided below the material 3 to be coated, which is held by the holding means 4, to receive the coating material mist 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a coating apparatus,
More specifically, the present invention relates to a coating apparatus for coating an object to be coated in a coating booth.

[0002]

2. Description of the Related Art Conventionally, a coating booth for performing coating is disclosed in Japanese Patent Publication No. 8-17976. In the conventional coating apparatus 100 shown in FIG. 2, reference numeral 110 denotes a plate-like member, which is formed by a strip-shaped iron plate, and a surface of which a mechanical oil as a liquid release agent is adhered to form an oil film 112, Two layers are arranged in the space immediately after the object 103 to be coated, which is applied by the paint mist 102 sprayed from the spray nozzle 101 in a spray state.

According to the coating apparatus 100, the paint mist 102 travels along the flow of the air sucked by the exhaust fan 120. However, since the flow path is bent by the layer of the plate member 110, the paint mist 102 is separated from the air by the inertial force, collides with the plate member 110, and is collected by the oil film 112 on the surface of the plate member 110. You.

[0004] At this time, since the two-layer plate-like member 110 is disposed with a sufficiently large interval, the airflow resistance including the paint mist can easily pass through because the airflow resistance is low.
Therefore, the load on the exhaust fan 120 is small. Further, the plate-like member 110 is supported in a state of being suspended from above, and is held in a state where the lower end thereof is slightly inclined in the air flow direction due to the pressure of the air flow impinging on the plate-like member 110. For this reason, the plate-shaped member 110 does not shake even if the lower end is in the free state.

[0005] The paint mist 102 is formed to some extent by the plate-like member 110, and the purified air is guided to a wet collecting device, and the paint mist 102 is further collected, and the purified air is further purified. It is discharged from the discharge port 109.

[0006] The wet type collecting device will be described below. The air cleaned by the plate member 110 is supplied to the exhaust chamber 107.
An air flow indicated by an arrow is caused by an exhaust fan 120 provided above the
Is sucked into the exhaust chamber 107 from the gap between the shield plate 106 and the air.

At this time, the flow velocity of the air passing through the gap between the water surface 105 and the shielding plate 106 increases, and the flow path is sharply bent. Therefore, paint mist 10
2 are separated from the air stream by centrifugal force, collide with the water surface and are collected in the water.

On the other hand, the water tank 104
A part of the water stretched is wound up, becomes mist-like water particles, and is sucked into the exhaust chamber 107 together with the air flow. At this time, the remaining coating mist 102 collides with water particles and is trapped in the water particles.

The water particles that have collected the paint mist 102 strike a water separating plate 108 provided in an exhaust chamber 107 and are separated from air, and fall into the lower water tank 104 by the gravity. As a result, the paint mist 10
2 is collected as a sludge, and the water is prevented from being discharged from the discharge port 109 to the outside.

[0010]

However, in the prior art, a spray nozzle 101 is installed laterally, and a paint mist 102 is sprayed on a workpiece 103 from the side to spray.
It is collecting paint mist scattered sideways. For this reason, the paint mist 102 that falls downward due to gravity cannot be collected,
There is a problem that the paint mist 102 falls into the coating apparatus 100 and the floor on the front surface is very dirty.

Since the paint mist 102 scattered in the coating apparatus 100 is dried and becomes dust and floats in the booth, there is a problem that the floating dust adheres to an object to be coated. The floating dust adhering to the painted surface roughened the painted surface, and frequently caused unusable appearance defects (defective rate 30
%).

The coating booth is cleaned in order to prevent the occurrence of the defect. However, there is a problem that the defect continues to occur because the dried paint mist which has become fine dust cannot be completely removed (after the cleaning). Defective rate 15-20%).

Further, in this cleaning, the inside of the coating booth must be wiped off with a solvent, so that much time is required for manual work, and there is a problem that productivity is reduced because work cannot be performed during that time. Furthermore, this cleaning work had to be performed in the strong smell of the solvent, and was a difficult and badly conditioned job that everyone hated.

The present invention has been made in consideration of such conventional problems, and provides a coating apparatus capable of obtaining a good coated object without causing paint mist to diverge and contaminating the inside of a coating booth. The purpose is to do.

[0015]

According to one aspect of the present invention, there is provided a coating apparatus for coating an object to be coated in a coating booth with a spraying means for spraying a paint mist downward. Holding means for positioning and holding the object to be coated below the spraying means for spraying the paint mist from the spraying means onto the object to be coated, and holding the holding means for receiving the paint mist. Receiving means provided below the object to be coated.

In the present invention, the spray direction of the paint mist goes from top to bottom, and the remaining paint mist sprayed on the object to be coated is further received by the receiving means provided thereunder. In addition, it is possible to suppress the scattering of paint mist and collect everything without floating inside the booth.

According to a second aspect of the present invention, in the first aspect of the invention, the periphery of the object held by the holding means is:
It is characterized in that the air flow is a downward air flow.

According to the present invention, since the flow of air and the direction of the spray of the paint mist are directed downward from the top, the object to be coated is painted efficiently and the paint mist which does not contribute to the painting is not scattered. , Can be guided to receiving means provided below.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the storage means for storing the liquid for collecting the paint mist, and the liquid stored in the storage means, A supply unit for supplying the liquid to the receiving unit, wherein the liquid is supplied from the storage unit to the receiving unit via the supply unit, and then circulated to return to the storage unit again. And

According to the present invention, the paint mist that has not contributed to the coating is collected so as to be absorbed by the liquid supplied to the receiving means, and can be entirely recovered without being scattered. For this reason, it is possible to completely prevent the problem that the remaining paint mist dries and floats as dust in the paint booth, resulting in defective paint. Also, since the liquid is circulated back to the storage means,
It is not necessary to replenish during operation, and the sludge of the paint mist can be collected in the storage means.

[0021]

FIG. 1 shows a coating apparatus 100 according to an embodiment of the present invention. In FIG. 1, a casing booth 20 is provided with two or more intake filters 18 at the top. The intake filter 18 prevents external air containing dust from entering the painting booth 20. For this reason, the outside air is purified and is sucked into the painting booth 20 as a downward airflow indicated by an arrow.

A spray nozzle 1 as the spray means is provided above the coating booth 20. This spray nozzle 1 directs the paint mist 2 downward,
In order to spray and spray, the nozzle opening 1a is attached facing downward. The spray nozzle 1 is attached to a tip hand (not shown) of a robot or the like, and is movable.

At the position of the spray nozzle 1 facing the nozzle port 1a, that is, below the spray nozzle 1,
An object to be coated 3 held by a rotary jig 4 as the holding means is arranged. The rotating jig 4 includes a coating booth 2
0, which is rotatably extended from a conveyor 5 attached to the outer side surface thereof, can rotate about an axis, and faces the entire periphery of the workpiece 3 held so as to face the nozzle port 1a. , Enables even painting. In addition, the rotating jig 4
Can move back and forth in the axial direction (horizontal direction), so that the unpainted work 3
In order to perform painting work one after another.

Below the workpiece 3 held by the rotating jig 4, a plurality of plate members 7 as the receiving means are provided. The plate-shaped member 7 is disposed obliquely so that a liquid 9 described later flows toward the center of the coating booth 20. Further, the plurality of plate members 7 are alternately arranged at predetermined intervals so that air can pass through the disposition gap, and the lower portions are supported by the support members 8 erected from the lower portion of the coating booth 20. Are fixedly supported.

On the other hand, the upper portions of the plurality of plate members 7 are mounted in contact with the rectangular liquid receivers 6 provided on both side surfaces in the coating booth 20, respectively. In FIG. 1, 13
Fig. 3 shows a state in which the liquid 9 pumped to the liquid receiver 6 overflows and flows on the surfaces of the plurality of plate-like members 7 toward the center of the coating booth 20, and the paint mist 2 is absorbed by the liquid 9. ing.

Further, a storage section 30 as storage means for storing the liquid 9 flowing down on the plate-like member 7 is provided below the coating booth 20. The storage unit 30 precipitates and collects the sludge of the paint mist 2 collected in the liquid 9. The liquid 9 stored in the storage unit 30 uses water or oil, but is not limited to this as long as the paint mist 2 can be absorbed and collected.

The liquid 9 stored in the storage section 30 is
The pipe 11 connected to the storage unit 30 and the pump 1
0 and the pipe 12 connected to the pump 10
And a liquid receiver 6 having an opening at the upper end of the pipe 12 and circulates by a supply means to collect the coating mist 2. In FIG. 1, the supply means to the other liquid receiver 6 has the same configuration and is not shown.

A plurality of intake ports 14 are provided below the coating booth 20 at a position higher than the level of the liquid 9 stored in the storage section 30. This intake port 14 is connected to an exhaust device 21 via a duct 15. The exhaust device 21 includes a fan 17 for exhausting air in the painting booth 20 connected by a duct,
It is provided with one or a plurality of filters 16 for collecting paint mist 2 that could not be collected in the inside and liquid fine particles.

Next, a method of coating the work 3 using the above-structured coating apparatus will be described in detail. In FIG. 1, first, the inside of the painting booth 20 is depressurized by rotating the fan 17 of the exhaust device 21,
Air is taken into the painting booth 20 via an intake filter 18 provided on the upper part of the painting booth.

At this time, the air taken into the coating booth 20 is clean air from which dust is removed. The air that has entered the coating booth 20 flows downward (in the direction of the arrow shown in FIG. 1) and passes around the workpiece 3 held by the rotating jig 4.

In this state, the paint mist 2 is ejected downward, that is, toward the object 3 from the spray nozzle 1. At this time, the paint mist 2 can be sprayed on the entire surface of the workpiece 3 by rotating the rotating jig 4 holding the workpiece 3.

The air that has passed through the periphery of the object 3 goes downward with the paint mist 2 not used for coating, and passes through the gap in which the plurality of plate-like members 7 are arranged. The mouth 14 is reached.

At this time, since the flow path of the paint mist 2 contained in the air is bent by the layer of the plate-like member 7,
It is separated from air by inertia, collides with the surface of the plate member 7, is collected by the liquid 13 flowing down on the surface of the plate member 7, and is collected as the liquid 9 in the storage unit 30. (In FIG. 1, the liquid 9 flowing down as a receiving means is indicated by reference numeral 13 for easy understanding.)

The liquid 9 is initially stored in the storage section 30 and includes a pipe 11, a pump 10 and a pipe 12.
To the liquid receiver 6 via the By continuing the pumping operation, the liquid receiver 6 cannot receive the liquid 9, becomes the liquid 13 overflowing from the liquid receiver 6, and flows on the plate member 7.

The liquid 13 flowing on the plate member 7 flows down toward the center of the coating booth 20 and returns to the storage section 30 again. In this manner, the liquid 9 collects the coating mist 2 while circulating and collects the coating mist 2 in the storage unit 30.

The paint mist 2 that has passed through the space between the plate-like members 7 is removed, and the clean air is sucked from the intake port 14 to the exhaust device 21 through the duct 15.
This air is filtered by the filter 16 in the exhaust device 21.
Paint mist 2 that could not be collected in painting booth 20
Alternatively, the liquid fine particles are collected, further converted into clean air, and exhausted to the outside by the fan 17.

When a solvent such as a thinner is used for the paint, the filter 16 in the exhaust unit 21 is made of activated carbon or the like that can absorb odors, so that harmful odors are not discharged. It is desirable.

From the above description, the present invention includes the inventions of the following additional items.

(1) In an apparatus for painting, a painting booth for accommodating an object to be painted, two or more intake filters provided at the top of the painting booth, A spray nozzle for ejecting paint mist toward the nozzle, a conveyor jig provided below the spray nozzle, for conveying and rotating the object to be coated, and a liquid receiver provided on both side walls below the object to be coated,
A plurality of plate-like parts mounted obliquely from the liquid receiver,
A coating, comprising: water or oil or a liquid similar thereto stored in the lowermost portion of the coating booth, a pump for pumping the liquid to the liquid receiver, and an exhaust device for exhausting air from the coating booth. apparatus.

In the present invention, clean air from which dust has been removed is supplied into the painting booth by two or more intake filters provided at the top of the painting booth.

Further, it is provided at the upper part in the painting booth,
Because of the spray nozzle that sprays the paint mist downward from above, the paint mist is blown in a direction that does not oppose the airflow from above and gravity. Therefore, the paint mist can be efficiently sprayed on the object to be coated.

Further, the workability can be improved by a conveyor jig provided below the spray nozzle and configured to convey and rotate the object to be coated. Still further, a liquid receiver provided on both side walls below the object to be coated, a plurality of plate-like parts mounted diagonally from the liquid receiver, and water or oil or water or oil stored at the lowermost portion of the coating booth. A coating mist that has not contributed to coating can be collected by a liquid similar to the above.

Furthermore, the liquid can be circulated and reused by a pump that pumps the liquid into the liquid receiver. By the exhaust device that exhausts air from the coating booth, the air pressure in the coating booth becomes lower than the outside air, and a clean airflow from the upper side to the lower side can be obtained through the filter provided at the top, and the scattering of the coating mist can be obtained. Can be prevented.

(2) In a coating apparatus for coating an object to be coated in a coating booth, a spraying means for spraying a paint mist downward, and a method for spraying the paint mist from the spraying means onto the object to be coated, Holding means for positioning and holding the object to be coated below the spraying means; receiving means provided below the object to be coated held by the holding means for receiving the paint mist; and the receiving means A supply unit for supplying a liquid for absorbing the paint mist thereon.

Also in the present invention, the above-described effect is exhibited, and the scattering of the coating mist can be efficiently prevented.

(3) A storage means for storing the liquid is further provided, wherein the supply means supplies the liquid from the storage means to the receiving means and returns the liquid to the storage means again. ).

According to the present invention, the liquid for absorbing and collecting the coating mist can be circulated and reused, and can be collected and collected in the storage means.

(4) The receiving means is disposed obliquely so that the liquid on the receiving means flows toward the center of the coating booth.
Or the coating device according to (3).

According to the present invention, the paint mist riding on the downwardly flowing air flow is liable to collide with the obliquely arranged receiving means, and the liquid that has absorbed and collected the paint mist is
It flows down to the center of the painting booth and can be collected in storage means.

(5) Evacuation means for sucking air from the upper part to the lower part of the coating booth so that the flow of air around the object held by the holding means is directed downward. Additional notes (2) to
(4) The coating device according to (1).

According to the present invention, the pressure in the coating booth is made lower than that of the outside air by the exhaust device for exhausting air from the coating booth, and a clean air flow from the upper side to the lower side is obtained through the filter provided at the top. Can prevent the paint mist from scattering.

[0052]

According to the first aspect of the present invention, the spray direction of the paint mist goes from top to bottom, and the remaining paint mist sprayed on the object to be coated is further transferred to the receiving means provided thereunder. As a result, it is possible to collect all of the paint mist without having to float inside the booth, against the gravity and without scattering the paint mist.

According to the second aspect of the present invention, the flow of air
Since the spraying direction of the paint mist goes from top to bottom, it is possible to efficiently paint the object to be coated and guide the paint mist that does not contribute to the coating to the receiving means provided below without scattering it. it can.

According to the third aspect of the present invention, the paint mist that has not contributed to the coating is collected so as to be absorbed by the liquid supplied to the receiving means formed of the plate-like member, and is not scattered. All can be recovered. For this reason, it is possible to completely prevent the problem that the remaining paint mist dries and floats as dust in the paint booth, resulting in defective paint. Further, since the liquid is circulated back to the storage means, it is not necessary to replenish the liquid during the operation, and the sludge of the paint mist can be collected in the storage means.

By the above-described effects, a paint mist diverges, and the inside of the painting booth is not stained, so that a good painted product can be obtained. Can be avoided.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a conventional coating apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 spray nozzle 2 paint mist 3 object to be coated 4 rotating jig 5 conveyor 6 liquid receiver 7 plate member 9 liquid 10 pumping pump 11,12 pipe 13 liquid flowing down 14 inlet port 15 duct 16 filter 17 fan 18 suction filter 20 coating booth DESCRIPTION OF SYMBOLS 21 Exhaust device 30 Storage unit 100 Painting device 101 Spray nozzle 102 Paint mist 103 Painted object 104 Water tank 105 Water surface 106 Shielding plate 107 Exhaust chamber 109 Outlet 110 Plate-shaped part 112 Oil film 120 Exhaust fan

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B05D 1/02 B05D 1/02 JH

Claims (3)

[Claims] In a coating apparatus for coating an object to be coated in a coating booth, a spraying means for spraying a paint mist downward, and the spraying means for spraying the paint mist from the spraying means on the object to be coated. Holding means for positioning and holding the object to be coated below the means; and receiving means provided below the object to be coated held by the holding means for receiving the paint mist. Characteristic coating equipment. 2. The coating apparatus according to claim 1, wherein the periphery of the object to be coated held by said holding means is an air flow in which air flows downward. 3. A storage unit for storing a liquid for collecting the paint mist, and a supply unit for supplying the liquid stored in the storage unit to the receiving unit. 3. After being supplied from said storage means to said receiving means via said supply means, circulation is performed so as to return to said storage means again.
Coating equipment as described.