JPH0451886Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a rotary electrostatic coating device that electrostatically coats, for example, a water-based paint and a solvent-based paint while changing colors.

[Conventional technology]

Generally, an electrostatic coating device using a bell-shaped or disk-shaped rotating atomizing head rotates the rotating atomizing head at high speed and applies a high voltage, and supplies paint to the rotating atomizing head in this state. The paint is electrically charged and atomized, and the atomized paint particles fly along the lines of electric force and are applied to the object to be coated.

Conventionally, as such an electrostatic coating device, the
The one shown in FIG. 4 is known.

First, in FIG. 3, 1 is an electrostatic coating machine, 2 is a main body made of a metal cylinder that forms the housing of the electrostatic coating machine 1, and the tip side of the main body 2 is an annular motor holder part 2A. A mounting bracket (not shown) is provided on the rear end side. 3 is the main body 2
Attach the motor fixing screws 4, 4 to the motor holder part 2A of
The air motor 3 is a turbine-type air motor that also serves as a hydrostatic air bearing and is installed through a shaft hole 5 drilled in the axial direction and a hydrostatic bearing support provided around the shaft hole 5. The motor is comprised of air bearings 6, 6, and a disk-shaped turbine motor 7 provided on the base end side of the shaft hole 5. Reference numeral 8 denotes a hollow cylindrical rotating shaft inserted into the shaft hole 5 of the air motor 3, and the base end side of the rotating shaft 8 is fixed to the turbine motor 7 so as to be rotationally driven by the turbine motor 7. The tip side protrudes outside the air motor 3, and the midway portion is axially supported statically by air bearings 6, 6. Note that 9 is a bearing air supply passage that supplies bearing air to the air bearing 6;
0 indicates a drive air supply passage that supplies drive air to the turbine motor 7.

11 is a rotating shaft 8 located outside the air motor 3.
The rotary atomizing head 11 has a bell-shaped rotating atomizing head fixed to the rotary atomizing head 11, and one end side of the rotating atomizing head 11 serves as a mounting portion 11B that is attached to the rotating shaft 8 across an axially intermediate rim 11A.
The other side becomes the smoothed surface 11C that expands in a morning glory shape,
The tip of the smoothed surface 11C is a discharge edge 11D in which a large number of V-shaped grooves are formed. A hub member 12 is attached to the rotary atomizing head 11 at a position midway on the smoothing surface 11C.
The back side of 2 is a convex conical paint supply surface 12A to which paint, cleaning solvent, etc. are supplied from a feed tube 22, which will be described later, and the paint supply surface 12A is located around the periphery.
A large number of first hub holes 12B are drilled to supply paint and cleaning solvent to the discharge edge 11D side, and a second hub hole is provided in the center to supply cleaning solvent when cleaning the hub front surface 12C. 12D is drilled.

Reference numeral 13 indicates a first shaping air nozzle provided on the tip side of the main body 2 so as to surround the outer periphery of the rotating atomizing head 11, and reference numeral 14 indicates a second shaping air nozzle provided outside the first shaping air nozzle 13. The shaping air nozzle 14 is screwed and fixed to a body cover 15 that covers the body 2 and the air motor 3, and the first shaping air nozzle 13 is sandwiched between the body 2 and the body cover 15. Here, a first shaping air chamber 16 is formed between the main body 2 and the main body cover 15, and shaping air is supplied to the air chamber 16 via a shaping air supply passage 17 formed in the main body 2. It is becoming more and more common. Further, a second shaping air chamber 18 is formed between the first and second shaping air nozzles 13 and 14, and a gap between the first and second shaping air chambers 16 and 18 is It communicates with the first shaping air nozzle 13 via a shaping air passage 19 formed in the first shaping air nozzle 13 . Then, the shaping air in the second shaping air chamber 18 is supplied to the rotary atomizing head 11 from the ring-shaped air jet holes 20 formed at the tips of the first and second shaping air nozzles 13 and 14. The paint pattern sprayed from the rotary atomizing head 11 is formed into a circular pattern. In addition,
A ring-shaped air ejection hole 21 is also formed between the outer peripheral surface on the tip side of the rotary atomizing head 11 and the tip of the first shaping air nozzle 13, and a part of the air flowing out from the air bearing 6, turbine motor 7, etc. is ejected as shaping air.

Further, 22 is a feed tube provided coaxially within the rotating shaft 8, and the feed tube 22 is composed of an outer cylinder 23 and an inner cylinder 24. Here, the proximal end side of the outer cylinder 23 is attached to the main body 2, the middle part becomes the valve seat part 23A, and the distal end side becomes the discharge passage 23B.
The discharge pipe portion 23C extends from the rim 11A of the rotary atomizing head 11 to the vicinity of the paint supply surface 12A of the hub member 12. Further, the base end side of the inner cylinder 24 is attached to the main body 2, and the distal end side extends near the valve seat part 23A of the outer cylinder 23, and a communication part 25 that communicates between the inner cylinder 24 and the outer cylinder 23 is provided. It is becoming.

Reference numeral 26 denotes a paint supply passage formed in the inner cylinder 24, and the paint supply passage 26 communicates with a discharge passage 23B formed in the discharge pipe portion 23C of the outer cylinder 23 via a paint supply valve 28, which will be described later, so as to be openable and closable. are doing. 27
is a paint discharge passage formed between the outer cylinder 23 and the inner cylinder 24, and the paint supply passage 26 and the paint discharge passage 27 communicate with each other at a communicating portion 25.

28 is a paint supply valve consisting of a 2-port, 2-position spring return type air switching valve.
8 is an actuator 28A provided in the main body 2
and a valve shaft 28B that is inserted into the inner cylinder 24 and whose proximal end moves forward and backward by the actuator portion 28A;
The valve body 28C is provided at the tip of the valve shaft 28B and is seated on and off the valve seat 23A of the inner cylinder 23, and opens and closes between the paint supply passage 26 and the discharge passage 23B. Reference numeral 29 designates a drain valve consisting of a spring return type air switching valve with 2 ports and 2 positions, and the drain valve 29 also has an actuator 29A provided in the main body 2, a valve shaft 29B, and a part of the paint discharge passage 27 that opens and closes. It consists of a valve body 29C.

Furthermore, in FIG. 4, 30 is a color change valve device, and the color change valve device 30 has N paint valves 30A, 30B, . . . 30N of colors A, B, C, .
, an air valve 30A _r that supplies cleaning air, and a thinner valve 30T _h that supplies cleaning thinner. The color change valve device 30 is connected to the paint supply passage 26 via a paint supply pipe 31 and a washable gear pump 32 for quantitatively supplying paint provided in the middle of the pipe 31. On the other hand, the aforementioned paint discharge passage 27 is connected to a drain tank 34 via a drain pipe 33.

In addition, in FIG. 3, 35 is a high resistance connected to a high voltage generator (none of which is shown) via a high voltage cable, and the main body 2, the rotating shaft 8, and the rotating mist are connected through the high resistance 35. A high voltage is applied to the chemical head 11. 2
6 is an external electrode attached to the main body cover 15;
High voltages are applied when using water-based paints.

Although the conventional technology is constructed as described above, the operation thereof will be described next using an example in which a solvent-based paint is used.

First, in the painting preparation process, paint supply valve 2
8. Close the drain valve 29, open one of the paint valves 30A to 30N of the color change valve device 30, for example, the paint valve 30A, and drive the gear pump 32. As a result, the paint supply pipe 31, gear pump 32, paint supply passage 26, etc. are filled with the color A paint. In this state, the high voltage generator does not apply high voltage or blow out shaping air, but the air motor 3 is driven to rotate, and the rotating shaft 8 and rotating atomizing head 11 have started rotating.

Next, in the painting process, a high voltage is applied from the high voltage generator to the main body 2, the air motor 3, the rotating shaft 8, the rotating atomizing head 11, etc. via the high voltage cable and the high resistance 35. Also, shaping air is supplied from the shaping air supply passage 17, and the first
The shaping air is ejected from the ring-shaped air ejection hole 20 via the shaping air chamber 16, the shaping air passage 19, and the second shaping air chamber 18. In this state, a painting air control signal is supplied to the actuator 28A of the paint supply valve 28, and the valve body 28A is integrally connected to the valve shaft 28B.
Displace C to the right in the figure to open the valve.

As a result, the A color paint in the paint supply passage 26 is discharged from the discharge passage 23B toward the paint supply surface 12A of the hub member 12 provided on the rotary atomizing head 11. Due to the high-speed rotation of the rotary atomizing head 11, the discharged color A paint passes through the first hub hole 12B and flows along the smoothed surface 11C toward the discharge edge 11D, and from the discharge edge 11D it flows into a liquid thread. It is atomized as electrostatic atomization and becomes charged particles. These charged particles fly along the lines of electric force between the rotary atomizing head 11 and the object to be coated, and are applied to the object to be coated.

A portion of the paint that has reached the paint supply surface 12A also flows out from the second hub hole 12D, but the amount of paint that flows out from the second hub hole 12D is extremely small.

Furthermore, in order to spray the next color paint, for example, the B color paint, the A color paint filled in the paint supply pipe 31, gear pump 32, paint supply passage 26, discharge passage 23B, etc., the rotary atomizing head 11, and the hub member. It is necessary to clean the A color paint that has adhered to the 12th grade. This is the cleaning process.

Therefore, in the cleaning process, the paint supply valve 28 is closed and the drain valve 29 is opened. Also, the application of high voltage by the high voltage generator is stopped. In this state, a cleaning control signal is output to the color change valve device 30 to alternately and repeatedly control the opening and closing of the air valve 30A _r and thinner valve 30T _h a plurality of times. As a result, the paint supply pipe 31, the gear pump 32, the paint supply passage 2
The A color paint and cleaning thinner remaining in the tank 6 are all collected into a drain tank 34 via a paint discharge passage 27, a drain valve 29, and a drain pipe 33.

Next, after cleaning the inside of the paint supply passage 26, the inside of the discharge passage 23B, the rotary atomizing head 11, the hub member 12, etc. are cleaned. For this reason, the paint supply valve 28
supplies an air control signal to open the valve body 28C,
Next, the air valves 30A _r and 30T _h of the color change valve device 30 are opened for a short time to supply cleaning air and thinner in spots.

As a result, the A color paint filled in the discharge passage 23B is swept away by the air and thinner, and the interior is cleaned. It flows through the supply surface 12A and the first hub hole 12B to the smoothed surface 11C toward the discharge edge 11D, and is discharged after sufficiently washing these surfaces. Further, the thinner that has flowed into the second hub hole 20 is transferred to the hub front surface 12.
Wash C.

Furthermore, once this cleaning process is completed, it is sufficient to proceed to a paint preparation process using the next color paint.

Note that the above explanation of the operation is based on the case where a solvent-based paint is used and a high voltage is applied directly to the rotary atomizing head 11. However, when a water-based paint or a metallic paint is used, the external electrode 36 Apply high voltage to.

That is, in general, the paint supply piping 11 and the paint tank are connected to ground for safety reasons, but since solvent-based paints have a relatively large electrical resistance, high voltage is applied to the rotating atomizer head 11. Even if the rotational atomizing head 11 is applied, there is no fear that the rotary atomizing head 11 will reach the ground potential via the paint supply pipe 31. Therefore, in the case of a solvent-based paint, a high voltage can be applied to the main body 2 itself using a high voltage generator, and the paint can be charged when it is atomized by the rotary atomizing head 11.

On the other hand, since water-based paints and metallic paints have low electrical resistance, the paint supply pipe 31,
When the paint tank is connected to ground, the rotary atomizing head 11 is short-circuited to the ground potential via the paint in the paint supply pipe 31, and the paint cannot be charged. Therefore, in this case, the rotating atomizing head 1
1, an external electrode 36 is provided near the rotating atomizing head 11, the external electrode 36 is connected to a high voltage generator, and a corona discharge region is formed outside the rotating atomizing head 11. A structure is adopted in which atomized paint particles are charged externally.

[The problem that the idea attempts to solve]

The tip of the outer cylinder 23 becomes the discharge pipe part 23C and is inserted into the rotary atomizing head 11, and the rib 11A
It extends further forward than the As a result, when paint is discharged from the discharge pipe section 23C during painting, the paint bounces off the paint supply surface 12A of the hub member 12,
The paint adheres to the outer circumferential surface of the distal end of the discharge pipe portion 23C and around the rim 11A, as shown by reference numeral 37 in FIG.

Now, if we consider the adhesion paint 37, there are two cases: the adhesion paint is made of solvent-based paint;
The effect on the quality of the painted surface differs greatly depending on whether the adhesive is a water-based paint or not.

That is, since solvent-based paints are easily soluble in the solvent thinner (hydrophobic solvent), the paint adhering to the discharge pipe portion 23C is exposed to thinner droplets discharged from the discharge pipe portion 23C during the cleaning process. It will be washed to some extent. Even if it remains adhered without being washed, the adhered paint 37 remains sticky and viscous, and will not have any adverse effect on the application of the next color paint. In addition, even if it is dropped as small droplets into the next color paint, it will be mixed into the next color paint and sprayed, so there is no risk of damaging the coating quality.

However, in the case of water-based paint, the discharge pipe section 23C
Once the paint adheres to the paint and dries, it becomes a dry, fixed paint that cannot be cleaned with thinner droplets. During the painting process for other colors, such fixed and dried paint peels off from the discharge pipe section 23C due to vibrations, etc., and falls into the rotating atomizing head 11 as small paint particles with a diameter of about 1 mm. Sometimes.

Since cleaning thinner is not discharged during the painting process, the small flakes of paint that have peeled off as described above are blown off as particles from the rotary atomizer head 11 toward the object to be coated. It gets smeared on things. In such cases, so-called "bubbles" may appear on the painted surface of the object.
This causes the problem that the entire object to be coated becomes a defective coated product.

The present invention was developed in view of these problems in the conventional technology, and even when water-based paint is used, it is possible to reliably wash and remove dried paint that adheres to the tip of the feed tube, rotating atomizer head, etc. An object of the present invention is to provide a rotary electrostatic coating device that can maintain coating quality.

[Means to solve the problem]

In order to solve the above problems, the present invention includes a cylindrical main body, an air motor provided in the main body, a rotating shaft that is inserted in the axial direction of the air motor and rotated by the air motor, and a rotating shaft that is inserted in the axial direction of the air motor and rotated by the air motor. It consists of a rotating atomizing head located outside and provided on the distal end side of the rotating shaft, and an outer cylinder and an inner cylinder coaxially provided within the rotating shaft, with the distal end extending into the rotating atomizing head. a paint passage formed within the inner cylinder of the feed tube to which paints of multiple colors, cleaning solvents and air are selectively supplied; and a paint passage formed between the inner cylinder and the outer cylinder of the feed tube. , a solvent passage to selectively supply a cleaning solvent and air for cleaning the tip of the feed tube.

[Effect]

With this configuration, even if water-based paint adheres to the tip of the feed tube, it will be reliably cleaned by the cleaning solvent supplied through the solvent passage during the cleaning process, and the cleaning solvent will be discharged by air. be done.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. Note that the same components as those in the prior art described above are given the same reference numerals, and their explanations will be omitted.

In the figure, reference numeral 41 denotes an electrostatic coating machine according to the present embodiment, and the electrostatic coating machine 41 has the same structure as the electrostatic coating machine 1 of the prior art, but has a double structure instead of the feed tube 22 of the prior art. A feed tube 42 is adopted, and the main body 2 is equipped with a drain valve 29.
The difference is that a tube tip cleaning valve 47 is provided in place of , and a drain valve 48 is newly provided.

Here, the feed tube 42 of this embodiment also has an outer tube 43 and an inner tube 44 provided coaxially within the rotating shaft 8.
It is made up of. The proximal end side of the outer cylinder 43 is attached to the main body 2, and the distal end side becomes a small diameter discharge pipe portion 43A, and the rim 11A of the rotary atomizing head 11.
It extends to the corresponding position. Further, the outer cylinder 44 is also attached to the main body 2 at its proximal end, and has a valve seat portion 44 in the middle on which the valve seat 28C of the paint supply valve 28 is seated.
A, and the distal end side is the discharge pipe part 43 of the outer cylinder 43.
A discharge pipe section 44B is coaxial with A, but has a smaller diameter than this, and the distal end of the discharge pipe section 44B is slightly longer than the discharge pipe section 43B.

45 is a paint passage formed in the inner cylinder 44;
The base end side of the paint passage 45 is opened and closed by a drain valve 48, which will be described later, and the middle part is opened and closed by a paint supply valve 28, and the inside of the discharge pipe portion 44B is The narrow diameter is a paint discharge passage 45A. 46 is a solvent passage formed between the outer cylinder 43 and the inner cylinder 44;
6 is opened and closed by a tube tip cleaning valve 47, and a solvent discharge passage 46A is formed between the discharge pipe portions 43A and 44B.

Reference numeral 47 designates a tube tip cleaning valve that has the same configuration as the drain valve 29 of the prior art, but is used in place of this, and the cleaning valve 47 also has an actuator 47.
A, a valve shaft 47B, and a valve body 47C that opens and closes the cleaning passage 46.

Reference numeral 48 designates the drain valve of this embodiment attached to the main body 2. The drain valve 48 is a 3-port, 3-position spring center type air switching valve, and the inflow side of the drain valve 48 is connected to the paint supply pipe. 31, and by setting the switching position A or B, the outflow side can be selectively switched to the paint passage 45 or the drain pipe 33.

Next, 49 is a color change valve device according to this embodiment, and the color change valve device 49 includes a solvent valve part 50 and a paint valve part 51.
and a caned valve section 52 that connects these. Here, the solvent valve section 50 includes an air valve 50A that supplies cleaning air, an alcohol valve 50A _l that supplies a hydrophilic solvent such as alcohol, a thinner valve 50T _h that supplies thinner, and a cleaning valve that supplies cleaning water. It consists of a _50W water valve. Further, the paint valve section 51 includes paint valves 51A, 51B, and 51C that supply solvent-based paints of colors A, B, and C.
Paint valve 5 that supplies a-color, b-color, and c-color water-based paint
1a, 51b, and 51c. Note that the gate valve section 52 is opened only during the cleaning process and closed during the painting process to prevent paint from flowing into the solvent valve section 50. The color change valve device 49 is connected to the inflow side of the drain valve 48 via a paint supply pipe 31 and a gear pump 32.

Furthermore, 53 is a solvent supply valve for cleaning, and the solvent supply valve 53 is composed of an air valve 53A _r and a thinner valve 53T _h , which is a sclerotic solvent. Thinner and air are selectively supplied to the passage 46.

The present embodiment is constructed as described above, and its operation will now be described using a case where water-based paint is applied as an example.

First, in the painting preparation process, the drain valve 48 is set to the switching position A, the paint supply valve 28 is closed, and one paint valve of the paint valve section 51 constituting the color change valve device 49, e.g. Paint valve 51a for water-based paint
The valve is opened and the gear pump 32 is driven. As a result, the paint supply pipe 31, gear pump 32, and paint passage 45 are filled with water-based a color paint. In this state, the high voltage generator does not apply high voltage or blow out shaping air, but the air motor 3 is driven to rotate, and the rotating shaft 8 and rotating atomizing head 11 have started rotating.

Next, in the painting process, a high voltage is applied to the external electrode 36 from a high voltage generator via a high voltage cable. In addition, shaping air supply passage 1
Shaping air is supplied from 7, and the shaping air is ejected from a ring-shaped air ejection hole 20.

Next, when the paint supply valve 28 is opened, the aqueous a-color paint in the paint passage 45 is discharged from the paint discharge passage 45A toward the paint supply surface 12A of the hub member 12 provided on the rotary atomizing head 11. . ejected a
The color paint is atomized by the high speed rotation of the rotary atomizing head 11. The paint particles are charged while passing through the corona discharge area by the external electrode 36, and these charged particles fly along the lines of electric force between the rotating atomizing head 11 and the object to be coated. paint on things.

Furthermore, in order to spray the next color paint, for example, solvent-based color A paint, the paint filling the paint supply pipe 31, the gear pump 32, the paint passage 45, the paint discharge passage 45A, the rotary atomizing head 11, the hub It is necessary to clean paint adhering to the members 12 and the like. This is the cleaning process.

For this reason, the drain valve 48 is set to the switching position B and connected to the drain tank 34. Also, the application of high voltage by the high voltage generator is stopped. In this state, the gate valve section 52 constituting the color change valve device 49 is opened, and a cleaning control signal is output to the solvent valve section 50 to cause the air valve 50A _r , thinner valve 50T _h , and cleaning water valve 50W to be opened. _a , one of the alcohol valves 50A _l is alternately and repeatedly controlled to open and close a plurality of times. As a result, the water-based A color paint, cleaning thinner, water, and alcohol remaining in the paint supply pipe 31 and gear pump 32 are removed from the drain tank 33 via the drain valve 48 and the drain pipe 33.
will be collected in full.

Next, after cleaning the inside of the paint supply passage 26, the inside of the paint passage 45, the paint discharge passage 45A, the rotary atomizing head 11, the hub member 12, etc. are cleaned. For this purpose, an air control signal is supplied to the paint supply valve 28 to open the valve body 28C, and then the solvent valve section 50 that constitutes the color change valve device 49 is opened for short periods of time multiple times in the same manner as described above. , supply cleaning air, thinner, water or alcohol in spots. As a result, the paint passage 45, the paint discharge passage 45A, the rotary atomizing head 11, etc. are cleaned.

Therefore, even if the necessary parts are cleaned by the above-mentioned cleaning process, the discharge pipe portion 44 of the inner cylinder 44
The water-based adhering paint 37 that has adhered to the tip of B and dried and solidified cannot be cleaned only with the splashed solvent during cleaning.

Therefore, in this embodiment, the feed tube 42
A solvent passage 46 is formed as a double structure, and the solvent passage 46 is connected to a solvent supply valve 53, and a tube tip cleaning valve 47 is provided in the middle thereof.

Therefore, in the cleaning process, the color change valve device 49
In parallel with or after cleaning the rotary atomizing head 11, the tube tip cleaning valve 47 is opened, and in this state, the thinner valve 53 of the solvent supply valve 53 is opened.
Open the T _h valve and supply thinner.

Thereby, the thinner from the thinner valve 53T _h is discharged from the solvent discharge passage 46A via the solvent pipe 54, the tube tip cleaning valve 47, and the solvent passage 46. As a result, the dried adhering paint 37 adhering to the tip of the discharge pipe portion 44B is reliably washed away by this thinner flow. After this cleaning is completed, the thinner may be discharged using the air valve 53A _r .

Thus, according to this embodiment, after painting with a water-based paint, the tip portion of the feed tube 42 is cleaned with the solvent from the solvent supply valve 53 provided separately from the color change valve device 49. Therefore, as in the conventional technology, the adhered paint peels off and falls into the rotary atomizing head 11 as small paint particles, which adhere to the object to be coated and cause "smudges" on the painted surface. can be prevented and the quality of the coating can be improved.

In the embodiment, a bell-shaped rotary atomizing head is used as an example of the rotary atomizing head, but the present invention may also be applied to a coating machine using a disc-type rotary atomizing head. Moreover, although the solvent supply valve 53 is composed of a thinner valve 53T _h and an air valve 53A _r , a wash water valve, an alcohol valve, etc. may be added. Furthermore, it goes without saying that the solvent supply valve 53 can be used not only when a water-based paint is used, but also when a solvent-based paint is used, and these can be appropriately selected depending on the cleaning program.

[Effect of idea]

The rotary electrostatic coating device according to the present invention is as described in detail above, and has a feed tube with a double structure, and a solvent passage is provided outside the paint passage.
During cleaning, solvent and air are selectively supplied from the solvent passage to reliably wash away paint adhering to the tip of the feed tube, making it possible to wash away paint that has dried and stuck like water-based paint. This makes it possible to improve coating quality and to establish an electrostatic coating machine that can use both water-based paint and solvent-based paint.

[Brief explanation of drawings]

Figures 1 and 2 relate to embodiments of the present invention;
The figure is a longitudinal sectional view of the main parts of the electrostatic coating machine according to this embodiment,
Figure 2 is a circuit diagram showing the supply system for paint, cleaning solvent, and air to the electrostatic coating machine shown in Figure 1;
Figure 4 relates to the prior art, Figure 3 is a vertical sectional view of the main part of an electrostatic coating machine according to the prior art, and Figure
FIG. 2 is a circuit configuration diagram showing a supply system for paint, cleaning solvent, and air to the electrostatic coating machine shown in the figure. 2...Body, 3...Air motor, 5...Shaft hole,
6...Air bearing, 7...Turbine motor, 8...
Rotating shaft, 11... Rotating atomizing head, 41... Painter body, 42... Feed tube, 43... Outer cylinder,
43A...Discharge pipe section, 44...Inner cylinder, 44B...
Discharge pipe section, 45...Paint passage, 45A...Paint discharge passage, 46...Solvent passage, 46A...Solvent discharge passage, 47...Tube tip cleaning valve, 48...
... Drain valve, 49 ... Color change valve device, 53 ... Solvent supply valve.

Claims (1)

[Scope of utility model registration request] a cylindrical main body, an air motor provided in the main body, a rotating shaft inserted in the axial direction of the air motor and rotated by the air motor, and a rotating shaft located outside the main body on the tip side of the rotating shaft. A rotary atomizing head provided therein, a feed tube consisting of an outer cylinder and an inner cylinder coaxially provided within the rotating shaft, the tip side of which extends into the rotary atomizing head, and an inner cylinder of the feed tube. a paint passage formed and selectively supplied with multiple color paints, cleaning solvent and air;
A rotary electrostatic coating device comprising a solvent passage formed between an inner cylinder and an outer cylinder of the feed tube, and through which a cleaning solvent and air for cleaning the tip of the feed tube are selectively supplied. .