JP3184405B2 - Rotary atomizing electrostatic coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a vehicle body,
The present invention relates to a rotary atomizing type electrostatic coating apparatus suitable for use in coating an object such as an electric appliance.

[0002]

2. Description of the Related Art The applicant of the present invention has a rotary atomizing type electrostatic coating apparatus, in which a feed tube having a double tube structure is disposed in a rotating shaft, a paint passage is formed in an inner cylinder, and an inner cylinder and an outer cylinder are formed. And a solvent passage between them, and even if the paint adheres to the tip of the feed tube, a cleaning solvent is discharged through the solvent passage so that the adhered paint can be reliably washed. (Japanese Utility Model Laid-Open No. 2-37766).

[0003] The rotary atomizing type electrostatic coating apparatus according to the above-mentioned prior art will be described with reference to FIGS. 4 to 6.

[0004] In the drawings, reference numeral 1 denotes an electrostatic coating machine, and 2 denotes a main body made of a metal cylinder which forms a housing of the electrostatic coating machine 1. An annular motor holder 2 A is provided at the tip end of the main body 2. Are integrally formed, and a mounting bracket (not shown) mounted on a reciprocator or the like at a base end side.
Is provided. Further, an outer peripheral side of the main body 2 is covered with a main body cover 3, and an external electrode for indirectly charging a paint having a low electric resistance such as a water-based paint or a metallic paint is provided on an outer surface side of the body cover 3. (Not shown) is provided.

[0005] Reference numeral 4 denotes a turbine type air motor mounted on a motor holder 2A of the main body 2. The air motor 4 is
It comprises a shaft hole 5 drilled in the axial direction, air bearings 6 and 6 provided so as to surround the shaft hole 5, and an air turbine 7 provided on the base end side of the shaft hole 5. ing.
Compressed air is supplied to each of the air bearings 6 from a bearing air supply passage 8 and to the air turbine 7 from a drive air supply passage 9.

Reference numeral 10 denotes a hollow cylindrical rotary shaft inserted through the shaft hole 5. The rotary shaft 10 has a proximal end fixed to the air turbine 7 and a distal end protruding outside the air motor 4. The rotating shaft 10 is driven to rotate by the air turbine 7.

Reference numeral 11 denotes a rotary shaft 1 located outside the air motor 4.
0 shows a bell-shaped rotary atomizing head fixed to the leading end of the rotary atomizer, and the rotary atomizing head 11 serves as a mounting portion 11B, one end of which is mounted on the rotary shaft 10 with an axially intermediate rim 11A interposed therebetween.
The other end is a smoothing surface 11C that expands like a bosh, and the leading end of the smoothing surface 11C is a discharge edge 11D in which a number of V-shaped grooves are formed.

Reference numeral 12 denotes a hub member provided in the middle of the smoothing surface 11C of the rotary atomizing head 11. The hub member 12 is
The rear side is a convex conical paint supply surface 12A to which paint or thinner as a cleaning solvent is selectively supplied from a feed tube 20 described later.
A large number of first hub holes 12B (only two are shown) for guiding the paint and the cleaning solvent from 2A to the discharge end edge 11D side of the rotary atomizing head 11 are formed, and a thinner is provided on the front side at the center. A second hub hole 12C for supplying the second hub hole is provided.

Reference numeral 13 denotes an inner air nozzle provided on the distal end side of the main body 2 so as to surround the outer periphery of the rotary atomizing head 11;
Indicates outer air nozzles provided outside the inner air nozzle 13. The outer air nozzle 14 is screwed to the main body cover 3 and the inner air nozzle 13 is connected to the main body 2.
And sandwiched between. In addition, each of the air nozzles 13, 1
4, an annular air ejection hole 15 is formed, and when the air from the shaping air supply passage 16 is supplied through the air chambers 17, 18, the air ejection hole 15 is formed. Rotating atomizing head 11 as shaping air
To form a coating pattern of the paint sprayed from the rotary atomizing head 11 into a circular shape. Further, another annular air ejection hole 19 is formed between the rotary atomizing head 11 and the inner air nozzle 13, and the air ejection hole 19 is formed by one of the air flowing out of each air bearing 6, the air turbine 7, and the like. The part is blown out as shaping air.

Reference numeral 20 denotes a feed tube provided coaxially within the rotating shaft 10. The feed tube 20 has a double tube structure comprising an outer tube 21 and an inner tube 22, which will be described later.

Reference numeral 21 denotes an outer cylinder which constitutes the feed tube 20 together with an inner cylinder 22 which will be described later. The outer cylinder 21 has a base end attached to the main body 2 and a distal end reduced in diameter to form a solvent discharge port 21A. The rotary atomizing head 11 extends to a position corresponding to the rim 11A.

Reference numeral 22 denotes an inner cylinder disposed coaxially within the outer cylinder 21. The inner cylinder 22 has a base end on the main body 2 side.
And a valve body 25C of a paint valve 25 described later on the way.
Is integrally formed, and the paint discharge port 2 protrudes out of the outer cylinder 21 while the diameter of the distal end side is reduced.
2B.

Reference numeral 23 denotes a paint passage formed in the inner cylinder 22. The paint passage 23 has a base end connected to a paint supply pipe 32, which will be described later, and a tip end located at the position of the paint discharge port 22B. Open toward the paint supply surface 12A. The paint passage 23 blows out the paint contained therein toward the hub member 12 when a paint valve 25 provided in the middle thereof opens and closes.

Reference numeral 24 denotes a solvent passage formed between the outer cylinder 21 and the inner cylinder 22. The solvent passage 24 has a base end connected to a solvent supply pipe 35 described later, and a tip end formed with a solvent discharge port. At the position of 21A, it opens toward the distal end side of the inner cylinder 22. The solvent passage 24 injects a thinner supplied from the outside toward the distal end of the inner cylinder 22 by opening and closing a distal cleaning valve 26 described later provided in the middle of the solvent passage 24. .

Reference numeral 25 denotes a normally-closed paint valve comprising a two-port, two-position, spring return type pneumatic switching valve. The paint valve 25 comprises an actuator 25A provided on the main body 2;
A valve shaft 25B having a proximal end connected to the actuator 25A and a distal end inserted into the inner cylinder 22, and a valve body 25C provided at the distal end of the valve shaft 25B and detachably seated on a valve seat 22A of the inner cylinder 22. It is composed of And the paint valve 2
5 is normally seated on the valve seat 22A and closed, and when external control air is supplied to and discharged from the actuator 25A, the valve shaft 25B is contracted and the valve body 25C is connected to the valve seat 22A of the inner cylinder 22.
And the paint passage 23 is opened.

Reference numeral 26 denotes a normally-closed front-end cleaning valve comprising a two-port, two-position spring return type pneumatic switching valve.
The distal side cleaning valve 26 has an actuator 26A provided on the main body 2 and a valve shaft 26B having a proximal side connected to the actuator 26A and a distal side inserted into the solvent passage 24.
And a valve body 26C provided on the tip end side of the valve shaft 26B and opening and closing the middle of the solvent passage 24. The tip-side cleaning valve 26 normally closes the solvent passage 24 and opens when control air is supplied from the outside to open a communication between a cleaning valve device 34 described below and the solvent passage 24. Is what you do.

Further, reference numeral 27 denotes a drainage passage formed in the main body 2, and one end of the drainage passage 27 is provided outside the electrostatic coating machine 1 through a drainage pipe 28 as shown in FIG. Is connected to a waste liquid tank 29 provided in the main body 2.
And in the middle of the paint passage 23.

Reference numeral 30 denotes a drain valve provided in the middle of the drain passage 27, and the drain valve 30 is a front-end cleaning valve 2.
6, a two-port, two-position spring-return pneumatic switching valve that is normally closed. And
The drain valve 30 opens and closes with control air from the outside, and thereby connects and disconnects between the drain passage 27 and the waste tank 29.

On the other hand, reference numeral 31 denotes a color changing valve device provided outside the electrostatic coating machine 1, and the color changing valve device 31 is provided in the paint supply pipe 32 and in the middle of the paint supply pipe 32. It is connected to the paint passage 23 via a gear pump 33.
The color changing valve device 31 selectively discharges a plurality of paints A, B,... (Only two colors are shown), water, thinner, and air, and supplies them to the paint passage 23.

Reference numeral 34 denotes the electrostatic coating machine 1 together with the color changing valve device 31.
3 shows a cleaning valve device provided outside the washing valve device.
Numeral 4 is connected to the tip-side cleaning valve 26 via a solvent supply pipe 35 and to the solvent passage 24 via the tip-side cleaning valve 26. The cleaning valve device 34 selectively discharges thinner and air for cleaning the distal end side of the inner cylinder 22 and the rotary atomizing head 11 and the like, and supplies the thinner and air to the solvent passage 24.

The rotary atomizing type electrostatic coating apparatus according to the prior art has the above-described configuration. Next, the operation of the apparatus will be described with reference to FIG. 6 using a water-based paint as an example.

First, a washing step and a A-color supply step are performed after the end of the previous color coating, and the A-color paint is filled from the paint supply pipe 32 to the paint passage 23 and the rotary atomizing head 11.

In the A color coating process, the rotary shaft 10 and the rotary atomizing head 11 are rotated by the air motor 4.
On the other hand, while applying a high voltage to the external electrode, the shaping air is supplied from the shaping air supply passage 16, and the shaping air is ejected from the air ejection hole 15 to the front side of the rotary atomizing head 11. Next, the paint valve 25 is switched to the switching position (a).
When the valve is switched to the switching position (b) and the valve is opened, the A color paint in the paint passage 23 flows from the paint discharge port 22B to the hub member 1.
2 is sprayed toward the paint supply surface 12A, and the rotary atomizing head 1
It is atomized by one high-speed rotation. The atomized A-color paint is charged while passing through the corona discharge region by the external electrode, and a coating pattern is formed by the shaping air from the air ejection holes 15 and 19, so that the external electrode is covered with the paint. By flying along the lines of electric force generated between the object and the object, the object is applied to the object.

Next, when the coating process for the color A is completed and the next color paint, for example, a water-based color B paint is sprayed, the paint remains on the paint supply pipe 32, the paint passage 23, the hub member 12 and the like. A washing step of washing the A color paint is performed.

That is, in the washing step, the drain valve 30 is switched from the switching position (a) to the switching position (b) to open the valve, and the drain passage 27 and the waste tank 29 are connected. From 31, water, air, and thinner are discharged alternately a plurality of times. Thus, the A-color paint remaining in the paint supply pipe 32 and a part of the paint passage 23 flows into the waste liquid tank 29 from the drain passage 27 via the drain pipe 28 and is collected. When the washing of the paint supply pipe 32 and a part of the paint passage 23 is completed, the paint valve 25 is switched to the switching position (B) and opened, and the thinner from the color changing valve device 31 is removed from the paint passage 23.
To the tip side of

Thus, the thinner discharges the A-color paint remaining in the paint passage 23 toward the paint supply surface 12A of the hub member 12 while discharging the paint at the tip end of the paint passage 23, the rotary atomizing head 11, the hub member 12 and the like. Wash etc.

In the A-color coating process, the paint 36 adheres to the outer periphery of the paint discharge port 22B at the end of the inner cylinder 22 when the A-color paint is discharged. However, in the above-described cleaning process, since the thinner or the like is only sprayed from the paint passage 23 toward the rotary atomizing head 11, the attached paint 36 cannot be washed. Therefore, in the cleaning step, in addition to the above-described main cleaning of the paint passage 23 and the like, auxiliary cleaning for spot-wise cleaning the outer peripheral side of the distal end of the inner cylinder 22 is performed.

That is, the tip side cleaning valve 26 is switched to the switching position (a).
To the switching position (b) to open the valve and discharge the thinner from the cleaning valve device 34. As a result, the thinner is supplied from the solvent supply pipe 35 to the solvent passage 24, and from the solvent discharge port 21 </ b> A to the paint discharge port 22 of the inner cylinder 22.
B is discharged toward the outer peripheral side to wash the attached paint 36.
When cleaning of the paint 36 on the outer periphery of the distal end side of the inner cylinder 22 is completed, thinner remaining in the solvent passage 24 is discharged by air from the cleaning valve device 34.

Finally, in the case of performing the B-color coating subsequent to the A-color coating, the color changing valve device 3 with the drain valve 30 opened.
1 to supply the B color paint into the paint passage 23 and the drain passage 27, and then close the drain valve 30 and open the paint valve 25 for a short time. After the B color paint is supplied and the preparation of the B color coating is performed, the coating of the object to be coated with the B color is started.

[0030]

By the way, in the above-mentioned rotary atomizing type electrostatic coating apparatus according to the prior art, water, air and thinner are discharged from the color changing valve device 31 at the time of color change, and the paint supply pipe 32 and the coating material are discharged. By flowing a part of the passage 23, the paint remaining in the paint supply pipe 32 and a part of the paint passage 23 is extruded, discharged to the waste liquid tank 29, and collected.

However, a large amount of the previous color paint remains in the paint passage 23 at the tip of the drain passage 27 branched to the waste liquid tank 29 side, that is, in the space reaching the paint discharge port 22 B in the inner cylinder 22. are doing.

For this reason, in the coating apparatus according to the prior art,
The paint remaining in the inner cylinder 22 occupying most of the paint passage 23 is discharged from the rotary atomizing head 11 into the painting booth. A large amount of paint or thinner is discharged, and there is a problem that the paint booth is contaminated by a large amount of discharged paint or thinner. In particular, in recent years, from the viewpoint of environmental protection, reduction of pollution by thinners and the like has been demanded from various industries. However, with the conventional technology, such demands cannot be satisfied, and reliability and performance are low. There's a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and increases the recovery rate of a pre-color paint or a cleaning solvent for cleaning remaining in a paint passage at the time of color change, so that paint discharged to the outside can be improved. It is an object of the present invention to provide a rotary atomizing type electrostatic coating apparatus capable of reducing the amount of a cleaning solvent.

[0034]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a rotary atomizing type electrostatic coating apparatus adopted by the present invention is:
A cylindrical main body, an air motor provided in the main body, a rotary shaft inserted in the axial direction of the air motor and rotated by the air motor, and a rotary shaft protruding out of the main body and provided on a tip side of the rotary shaft. A rotary atomizing head, and a feed tube provided coaxially within the rotary shaft and having a distal end extending into the rotary atomizing head.
The inner cylinder and a middle cylinder provided between the outer cylinder and the inner cylinder have a triple tube structure, and paint, cleaning solvent and air are selectively supplied into the inner cylinder toward the rotary atomizing head. A paint passage is provided, and a drain passage is provided between the inner cylinder and the middle cylinder, the leading end of which communicates with the paint passage to discharge paint and a cleaning solvent in the paint passage into a waste liquid tank. A solvent passage for supplying a cleaning solvent toward the front end side of the inner cylinder is provided between the inner cylinder and the outer cylinder.

[0035]

With the above arrangement, at the time of coating, the paint discharged from the paint passage is atomized by the rotary atomizing head and applied to the object to be coated. Also, at the time of color change, most of the pre-color paint remaining in the paint passage is discharged into the waste liquid tank through the drain passage and collected, so that the amount of paint and cleaning solution discharged to the outside is reduced. The paint adhered to the tip side of the inner cylinder and the rotary atomizing head is washed by the washing solvent supplied from the solvent passage.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those in the prior art shown in FIGS. 4 to 6 are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 41 denotes a feed tube according to the present embodiment provided coaxially within the rotary shaft 10. The feed tube 41 is a triple tube from an outer tube 42, an inner tube 43, and a middle tube 45 to be described later. It has a structure.

Reference numeral 42 denotes an outer cylinder according to the present embodiment.
The base end side is attached to the main body 2, the front end side is reduced in diameter and extends to a position corresponding to the rim 11A of the rotary atomizing head 11, and forms a solvent discharge port 42A.

Reference numeral 43 denotes an inner cylinder coaxially disposed in the outer cylinder 42. The inner cylinder 43 has a base end attached to the main body 2 and a distal end portion whose diameter is reduced to the outside of the outer cylinder 42. It protrudes and forms a paint discharge port 43C. As shown in FIG. 2, a valve body 49 of a paint valve 49 described later is provided on the distal end side of the inner cylinder 43.
A valve seat 43A, from which C is separated and seated, is integrally fixed, and communication holes 43B and 43B are formed in the vicinity of the base end side of the valve seat 43A to communicate a paint passage 46 and a drain passage 47 described later. I have. Further, the valve seat 4 is provided on the outer peripheral side of the inner cylinder 43.
An annular closing member 44 is fixed near the distal end side of 3A.

Reference numeral 45 denotes a middle cylinder provided between the outer cylinder 42 and the inner cylinder 43 and provided coaxially.
The base end is attached to the main body 2 and the distal end is the closing member 4.
4 so that the distal end is closed.

Reference numeral 46 denotes a paint passage formed in the inner cylinder 43. The paint passage 46 has a paint supply pipe 32 at its base end.
The tip side is open toward the paint supply surface 12A of the hub member 12 at the position of the paint discharge port 43C. The paint passage 46 is connected to the paint valve 4 provided in the middle thereof.
When the valve 9 opens, the paint contained therein is jetted toward the hub member 12.

Reference numeral 47 denotes a drainage passage formed between the inner cylinder 43 and the middle cylinder 45. The drainage passage 47 has a base end connected to the drainage pipe 28 and a distal end formed with a communication hole 43B. It is in communication with the paint passage 46 through the second passage. When the paint valve 49 is closed and the later-described drain valve 50 provided in the middle of the drain passage 47 is opened, water, air, and thinner as a washing solvent are supplied from the color changing valve device 31. Is supplied, the paint, thinner, and the like remaining in the paint passage 46 are discharged to the waste liquid tank 29 through the drain pipe 28.

Reference numeral 48 denotes a solvent passage formed between the outer cylinder 42 and the middle cylinder 45. The solvent passage 48 has a base end connected to the solvent supply pipe 35 and a tip end positioned at the solvent discharge port 42A. , And opens toward the outer peripheral side of the paint discharge port 43C of the inner cylinder 43. The solvent passage 48 is opened by opening a tip-side cleaning valve 51 described later provided in the middle thereof,
The thinner supplied from the cleaning valve device 34 is jetted toward the outer peripheral side of the paint discharge port 43C of the inner cylinder 43.

On the other hand, reference numeral 49 denotes a normally-closed paint valve comprising a spring return type pneumatic switching valve at two ports and two positions for opening and closing the paint passage 46, as shown in FIG. Similarly to the conventional paint valve 25, an actuator 49A provided on the main body 2, a valve shaft 49B having a base end connected to the actuator 49A and a distal end inserted into the inner cylinder 43, and a valve shaft 49B , And a valve element 49C which is detachably seated on the valve seat 43A of the inner cylinder 43. The paint valve 49 is actuated by an actuator 49A in response to external control air.
By moving B, the valve element 49C is separated and seated on the valve seat 43A of the inner cylinder 43, and the paint passage 46 is opened and closed.

Reference numeral 50 denotes a normally-closed drain valve composed of a two-port, two-position spring-return pneumatic switching valve for opening and closing the drain passage 47. The drain valve 50 is provided in the main body 2. An actuator 50A, a valve shaft 50B having a base end connected to the actuator 50A and a distal end inserted into the drain passage 47, and a valve shaft 50B provided at the distal end side of the valve shaft 50B;
And a valve body 50C that opens and closes the middle of the drainage passage 47. The drain valve 50 opens and closes the drain passage 47 by external control air.
And the waste liquid tank 29.

Reference numeral 51 denotes a normally-closed front-side cleaning valve comprising a 2-port, 2-position spring-return-type pneumatic switching valve for opening and closing the solvent passage 48. The front-side cleaning valve 51 has been described in the prior art. Similarly to the distal-side cleaning valve 26, an actuator 51A provided in the main body 2, a valve shaft 51B having a proximal end connected to the actuator 51A and a distal end inserted into the solvent passage 48, and a distal end of the valve shaft 51B. And a valve body 51C which is provided on the side and opens and closes the middle of the solvent passage 48. The tip-side cleaning valve 51 opens and closes the solvent passage 48 by external control air, and connects and shuts off the solvent passage 48 and the cleaning valve device 34.

The rotary atomizing type electrostatic coating apparatus according to this embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

In this embodiment, however, the feed tube 41 has a triple tube structure consisting of the outer cylinder 42, the inner cylinder 43, and the middle cylinder 45, and each communication hole 4 is provided between the inner cylinder 43 and the middle cylinder 45.
A drain passage 47 communicating with the paint passage 46 at the front end via 3B is formed.

As a result, when discharging the previous color paint at the time of color change, the valve body 49C of the paint valve 49 is seated on the valve seat 43A to shut off the paint passage 46, and in this state, the drain valve 50 is opened. Accordingly, the residual paint in the paint passage 46 flows into the waste tank 29 sequentially through the paint supply pipe 32, the paint passage 46, the respective communication holes 43B, the drain passage 47, the drain valve 50, and the drain pipe 28. The paint passage 4 located in the inner cylinder 43
Most of the pre-color paint remaining in 6 can be discharged into the waste liquid tank 29. Therefore, the amount of the pre-color paint remaining in the paint passage 46 can be reduced, and paint and thinner discharged from the paint passage 46 to the outside can be significantly reduced.

Thus, according to the present embodiment, the paint passage 4
6 and most of the thinner used to extrude the paint can be discharged into the waste liquid tank 29 and reliably collected, so that the paint booth is contaminated by the paint and the thinner. The situation can be effectively prevented, environmental protection can be promoted, and reliability can be greatly improved.

Further, since the amount of paint finally remaining in the paint passage 46 can be reduced to a small amount at the tip of the paint passage 46, the amount of thinner used to discharge and wash this paint during washing is reduced. Can be reduced.

In the above embodiment, a case where a rotary atomizing type electrostatic coating device of an indirect charging type is used as the rotary atomizing type electrostatic coating device is exemplified, but a high-resistance solvent-based coating material is used as the coating material. In such a case, the present invention may be applied to a direct-charging type rotary atomizing electrostatic coating apparatus that directly charges a paint.

In the above-described embodiment, the thinner and the air are selectively discharged from the cleaning valve device 34. However, a rubber valve or the like that elastically closes the solvent discharge port 42A at the tip of the outer cylinder 42 is provided. By providing such a structure, a mechanism for discharging air for discharging the thinner in the solvent passage 48 may be omitted, and a configuration for discharging only the thinner may be adopted.

[0054]

As described above in detail, according to the present invention, the feed tube has a triple tube structure comprising an outer tube, an inner tube, and a middle tube provided between the outer tube and the inner tube. A paint passage for selectively supplying paint, a cleaning solvent and air toward the rotary atomizing head is provided in the inside, and a tip end side communicates with the paint passage between the inner cylinder and the middle cylinder so that the paint passage is provided. Paint inside,
By providing a drain passage for discharging the cleaning solvent into the waste liquid tank, between the middle cylinder and the outer cylinder, by providing a solvent passage for supplying the cleaning solvent toward the tip side of the inner cylinder, At the time of color change, most of the pre-color paint remaining in the paint passage can be discharged into the waste tank through the drain passage and collected, so that, for example, paint or cleaning solvent discharged into the paint booth can be removed. The amount can be reduced, and contamination by paints and cleaning solvents can be prevented to improve reliability. Further, since the paint finally remaining in the paint passage can be reduced, the amount of the cleaning solvent used for extruding and cleaning the paint can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an electrostatic coating machine of a rotary atomizing type electrostatic coating apparatus according to the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing a main part in FIG. 1;

FIG. 3 is a circuit diagram showing the entire configuration of the rotary atomizing electrostatic coating apparatus.

FIG. 4 is a longitudinal sectional view showing a main part of an electrostatic coating machine of a rotary atomizing type electrostatic coating apparatus according to the prior art.

FIG. 5 is a circuit diagram showing the entire configuration of the rotary atomizing electrostatic coating apparatus.

FIG. 6 is a process explanatory diagram showing a painting process and a cleaning process.

[Explanation of symbols]

 2 Body 4 Air motor 10 Rotary shaft 11 Rotary atomizing head 29 Waste liquid tank 41 Feed tube 42 Outer tube 43 Inner tube 43B Communication hole 45 Middle tube 46 Paint passage 47 Drain passage 48 Solvent passage

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B05B 5/00-5/16 B05C 11/10 B05B 15/02

Claims (1)

(57) [Claims] 1. A cylindrical main body, an air motor provided in the main body, a rotary shaft inserted in the axial direction of the air motor and rotated by the air motor, and a tip end of the rotary shaft protruding outside the main body. A rotary atomizing head provided on the side,
A feed tube which is provided coaxially within the rotary shaft and has a tip end extending into the rotary atomizing head, and the feed tube is provided between the outer cylinder, the inner cylinder, and the outer cylinder and the inner cylinder. A triple tube structure is provided from the middle cylinder, and a paint passage for selectively supplying paint, a cleaning solvent and air toward the rotary atomizing head is provided in the inner cylinder, and between the inner cylinder and the middle cylinder. Is provided with a drain passage for discharging the paint and the washing solvent in the paint passage into the waste liquid tank by communicating with the paint passage at the tip end, and between the middle cylinder and the outer cylinder at the tip end of the inner cylinder. A rotary atomizing type electrostatic coating apparatus having a solvent path for supplying a cleaning solvent toward the apparatus.