JP7546462B2 - Nozzle head for electrostatic atomizing paint machine - Google Patents

Description

The present invention relates to a nozzle head for an electrostatic atomizing sprayer.

Painting robots are widely used to automate the painting of automobile bodies and other objects. One common type of painting robot is an industrial robot equipped with a painting nozzle at the tip. Nozzles of various structures are used depending on the painting method.

For example, JP 2018-8253 A (Patent Document 1) discloses an electrostatic spraying device used when performing electrostatic painting. The electrostatic spraying device in Patent Document 1 is equipped with a nozzle head in which multiple nozzles are arranged in a circular ring shape.

JP 2018-8253 A

As seen in the electrostatic spray device of Patent Document 1, nozzles in nozzle heads used for electrostatic painting are generally arranged in a circular ring. Therefore, when painting is performed using the electrostatic painting method, the paint pattern can appear uniform. Also, when using a nozzle head with nozzles arranged in a circular ring, when the nozzle head is swept along the workpiece, there are areas where one nozzle passes and areas where two nozzles pass, making it difficult to achieve a uniform thickness of the paint film.

Therefore, there is a need to develop a nozzle head for electrostatic atomizer painters that can achieve painting patterns different from those achieved when conventional nozzle heads are used.

The nozzle head for an electrostatic atomization coater according to the present invention comprises a paint chamber , a nozzle row in which a plurality of nozzles are arranged in a straight line and are fluidly connected to the paint chamber and which spray paint from openings at their tips, and electrodes provided on an extension of the nozzle row and adjacent to both ends of the nozzle row, and the tips of the electrodes are insulated .

According to this configuration, the nozzles are arranged in a straight line, which makes it possible to realize a coating pattern different from that achieved when using a conventional nozzle head in which the nozzles are arranged in a circular ring. Furthermore, according to this configuration, the electrical environment of each nozzle can be made uniform, which makes the manner in which the paint is discharged from each nozzle (such as the size and flight direction of the paint droplets) uniform, which can stabilize the coating quality. Furthermore, according to this configuration, it is possible to suppress the occurrence of overcurrent abnormalities caused by discharges generated from the tips of the electrodes.

Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments, which are given with reference to the drawings.

FIG. 2 is a cross-sectional side view of a nozzle head according to the embodiment. FIG. 2 is a cross-sectional top view of a nozzle head according to the embodiment. FIG. 2 is a partial front view of a nozzle head according to the embodiment. FIG. 2 is a cross-sectional top view showing a detachable structure of a nozzle head according to an embodiment. FIG. 2 is a cross-sectional view of a nozzle according to an embodiment. FIG. 1 is a cross-sectional view of a conventional nozzle. FIG. 11 is a cross-sectional top view of a nozzle head according to a modified example. FIG. 11 is a cross-sectional view of a nozzle according to a modified example.

An embodiment of a nozzle head for an electrostatic atomizing sprayer according to the present invention will be described with reference to the drawings. Below, an example will be described in which the nozzle head for an electrostatic atomizing sprayer according to the present invention is applied to a nozzle head 1 for an electrostatic atomizing sprayer that paints a substrate by spraying paint.

[Configuration of Nozzle Head]
In use, the nozzle head 1 according to this embodiment is attached to a main body B, which is connected to the working arm of a painting robot (not shown), on the side opposite to the side connected to the painting robot (Figs. 1 and 2). Note that Figs. 1 and 2 are cross-sectional views of the main body B and the nozzle head 1 attached thereto from two directions, and the relationship between the two views is indicated by line II-II (Fig. 1) and line I-I (Fig. 2) in each figure.

The main body B is formed with a paint supply passage P1 and a paint return passage P2 that connect the paint chamber 2 inside the nozzle head 1 to a paint supply source (not shown). In addition, the paint supply passage P1 and the paint return passage P2 are each provided with a supply side switching valve V1 that opens and closes the paint supply passage P1, and a return side switching valve V2 that opens and closes the paint return passage P2.

The nozzle head 1 comprises a paint chamber 2, a number of nozzles 3, and an electrode 4. Each nozzle 3 is in fluid communication with the paint chamber 2 at its base end 31 (Figs. 1 and 2). The nozzles 3 are arranged so that the openings 32a at the tip 32 of each nozzle 3 are arranged in a straight line along the straight line X (Figs. 1 and 3). In the following description, when referring to the direction of each part, the side of the nozzle head 1 where the nozzles 3 are provided (the right side of the paper in Figs. 1 and 2) may be referred to as the "front" (e.g., "forward", "front part"), and the side of the nozzle head 1 connected to the main body part B may be referred to as the "rear" (e.g., "rear", "rear part").

The electrostatic atomizing paint coater is equipped with a voltage application device (not shown) that applies a potential difference between the workpiece and the nozzle head 1, and the paint sprayed through the paint supply path P1, the paint chamber 2, and the nozzle 3 becomes charged by the application of a high voltage by this voltage application device. In addition, an electric field is formed around the openings 32a of the nozzle 3 by the application of a high voltage by this voltage application device, and the charged paint sprayed from each opening 32a is atomized by the action of the electric field formed around each opening 32a as a so-called electrostatic spray, and the atomized charged paint is electrostatically attracted to the workpiece by the potential difference between the nozzle head 1 and the workpiece, flies, and is applied to the surface of the workpiece.

The nozzle head 1 has a structure in which the first part 11 including the paint chamber 2 and the second part 12 including the tip 32 of the nozzle 3 are detachably attached (Figure 4). When connecting the first part 11 and the second part 12, the first part 11 and the second part 12 are fastened together using the fixing part 13. Note that the method of fastening the first part 11 and the second part 12 using the fixing part 13 can be any method known as a method of connecting mechanical parts, and the structure of the fixing part 13 and the corresponding partial structures of the first part 11 and the second part 12 are structures corresponding to the connecting method employed. For example, they can be an interlocking structure, a screw-fitting structure, etc.

The nozzle 3 is divided into a nozzle portion 3A on the base end 31 side included in the first part 11 and a nozzle portion 3B on the tip end 32 side included in the second part 12, and when the first part 11 and the second part 12 are fastened, the two nozzle portions 3A and 3B are connected to form the nozzle 3 (Fig. 5). Specifically, a portion 33 of the nozzle portion 3B protruding from the base end side of the second part 12 can be accommodated in a space 11a provided on an extension line of the nozzle portion 3A of the first part 11, and when the portion 33 is inserted all the way into the space 11a, the two nozzle portions 3A and 3B are connected (Fig. 4).

(Paint chamber configuration)
The paint chamber 2 is provided as a substantially rectangular parallelepiped space inside the first part 11 of the nozzle head 1 (FIGS. 1 to 3). The front side of the paint chamber 2 is in fluid communication with the base ends 31 of the multiple nozzles 3, and the rear side of the paint chamber 2 is in fluid communication with the paint supply path P1 and the paint return path P2. A valve (not shown) capable of controlling the amount of paint flowing into the nozzles 3 is provided inside the paint chamber 2. The valve may be one or more valves capable of collectively controlling the amount of paint flowing into the multiple nozzles 3, or may be multiple valves capable of individually controlling the amount of paint flowing into each of the multiple nozzles 3.

Inside the paint chamber 2, a plurality of on-off valve devices 21 are provided. Each on-off valve device 21 is implemented as a valve body that can close the connection between the base end group and the paint chamber over some or all of the base ends 31 (hereinafter referred to as the base end group) of the plurality of nozzles 3. Each of the plurality of on-off valve devices 21 can individually select a position in which the connection between the base end group and the paint chamber 2 is closed or opened. By providing such on-off valve devices 21, when stopping paint spraying on the workpiece to interrupt or finish the painting work, the on-off valve device 21 is operated to close the connection between the base end group and the paint chamber 2, thereby preventing paint from leaking from the nozzle 3. This makes it possible to avoid contamination of the surroundings of the nozzle head 1 due to leaked paint. In addition, when painting the end of the workpiece, there may be cases where there is no workpiece opposite some of the plurality of nozzles 3. In such a case, the connection between the base end 31 of the nozzle 3 that does not have an opposite workpiece and the paint chamber 2 is closed to avoid wasteful consumption of paint.

(Nozzle configuration)
In this embodiment, the nozzles 3 are implemented as straight pipes with an outer diameter of 0.8 mm, an inner diameter of 0.3 mm, a wall thickness of 0.25 mm, and a length of 60 mm. The dimensions of the nozzles 3 can be appropriately selected depending on the properties of the paint used (such as the type of solvent, viscosity, and solids concentration) and the size of the workpiece. However, the inner diameter of the nozzles 3 is preferably 0.2 to 1.0 mm. The length of the nozzles 3 is preferably 5 to 100 mm.

In this embodiment, the multiple nozzles 3 are arranged at equal intervals, and the distance between adjacent nozzles 3 is 3 mm. In this embodiment, 100 nozzles 3 are arranged parallel to each other along the straight line X. By arranging multiple (100) nozzles 3 in parallel, paint droplets can be ejected in parallel from each nozzle 3.

In this embodiment, the first nozzle 34 and the second nozzle 35 shown in FIG. 1 are configured so that the difference between the first head, which is the head at the connection part 341 between the first nozzle 34 and the paint chamber 2, and the second head, which is the head at the connection part 351 between the second nozzle 35 and the paint chamber 2, when the linear row of the multiple nozzles 3 is parallel to the vertical direction (when the direction in which the multiple nozzles 3 extend is horizontal), is within 10% of the second head. Here, the first nozzle 34 is the nozzle 3 that is positioned at the highest position based on the installation surface of the electrostatic atomization paint sprayer when the linear row of the multiple nozzles 3 is parallel to the vertical direction (i.e., when the orientation shown in FIG. 1 and FIG. 2 is taken), and the second nozzle 35 is the nozzle 3 that is positioned at the lowest position based on the installation surface of the electrostatic atomization paint sprayer. The configuration in which the difference between the first head and the second head is within 10% of the second head can be realized by appropriately selecting the inner diameter, length, and arrangement of the nozzle 3. In this embodiment, the nozzles 3 are implemented as straight tubes with an outer diameter of 0.8 mm, an inner diameter of 0.3 mm, and a length of 60 mm, and are arranged in a line at intervals of 3 mm. This configuration achieves the aforementioned head difference.

The nozzle 3 has a first portion 36 on the base end 31 side and a second portion 37 on the tip end 32 side (FIG. 5). In this embodiment, the first portion 36 is a portion made of a weakly conductive resin and has a length of 59 mm, and the second portion 37 is a portion made of an insulating resin and has a length of 1 mm. As is clear from the materials constituting each portion, the first portion 36 has a certain degree of conductivity, but the second portion 37 has substantially no conductivity. The "weakly conductive resin" constituting the first portion 36 refers to a resin material having a volume resistivity of 10 ¹² Ω·cm or less. However, the first portion 36 may be made of any material having a volume resistivity of 10 ¹² Ω·cm or less, and may be made of metal, for example. The first portion 36 is more preferably made of a material having a volume resistivity of 10 ⁸ to 10 ¹² Ω·cm. The second portion 37 may be made of any material having a volume resistivity of 10 ¹⁴ Ω·cm or more.

(Electrode configuration)
The electrodes 4 are provided on the extensions of the ends of the linear row of the nozzles 3. That is, the electrodes 4 are provided along the straight line X, similar to the nozzles 3. The electrodes 4 are implemented as metal round bars having a diameter of 0.8 mm, and are conductors. However, the material constituting the electrodes 4 may be any material as long as it has a volume resistivity of 10 ¹² Ω·cm or less, and may be, for example, a weakly conductive resin in addition to the metals exemplified above.

The electrode 4 is provided at a position adjacent to the first nozzle 34 and the second nozzle 35 along the straight line X. The distance between the electrode 4 and the first nozzle 34 and the second nozzle 35 is 3 mm, which is the same as the distance between the nozzles 3. Furthermore, the tip of the electrode 4 and the tips 32 of the multiple nozzles 3 are substantially on the same plane. In other words, the length by which the electrode 4 extends forward and the length by which the nozzles 3 extend forward are the same (60 mm).

A cap 41 is attached to the tip of the electrode 4. The cap 41 is a cylindrical body with a bottom made of insulating resin and a thickness of 0.5 mm. As is clear from the fact that it is made of insulating resin, the cap 41 is substantially non-conductive. In other words, the tip of the electrode 4 is insulated. The material and dimensions constituting the cap 41 are arbitrary as long as they are capable of insulating the tip of the electrode 4.

[Function and effect of nozzle head]
Next, favorable effects brought about by the nozzle head 1 having the above configuration will be described.

In the nozzle head 1 according to this embodiment, multiple nozzles 3 are arranged in a line, so that a different painting effect can be obtained than with conventional nozzle heads in which multiple nozzles are arranged in a ring. Specifically, it is easy to make the thickness of the coating film uniform. When using a nozzle head in which nozzles are arranged in a ring, when the nozzle head is swept along the workpiece, there are places where one nozzle passes and places where two nozzles pass, so it can be difficult to make the thickness of the coating film uniform. However, when multiple nozzles 3 are arranged in a line, different issues can arise than when they are arranged in a ring.

First, the head difference between the nozzles 3 becomes a problem due to the different heights at which the nozzles 3 are positioned when in use. The head difference is particularly likely to be a problem in a nozzle head in which the nozzles are arranged in a straight line, as in this embodiment. This is because a nozzle head in which multiple nozzles are arranged in a straight line is often required to have a larger coating width than a nozzle head in which multiple nozzles are arranged in a circular ring, and the distance between both ends of the straight line arrangement is larger than the diameter of the circle in the circular ring arrangement, which makes it easier for the height difference between the multiple nozzles to be large. If the head difference between the nozzles 3 is large, the amount of paint discharged may differ significantly for each nozzle 3, which leads to uneven painting. Therefore, in this embodiment, the difference between the first head and the second head for the first nozzle 34 and the second nozzle 35, which have the largest head difference, is configured to be within 10% of the second head, thereby suppressing the head difference between any nozzles 3 to a level that does not cause problems in use.

Secondly, the uniformity of the electric field formed around each nozzle 3 is an issue. When performing electrostatic painting, in which charged paint is discharged from multiple nozzles and attached to the workpiece, it is necessary to make the electrical environment of the multiple nozzles uniform in order to stabilize the painting quality by making uniform the manner in which the paint is discharged from each nozzle (size of paint droplets, flight direction, etc.). In particular, since the electric field formed around a specific nozzle is affected by the electric field formed around other adjacent nozzles, it is common to make the relative positional relationship of the multiple nozzles uniform. In the case of a conventional nozzle head in which multiple nozzles are arranged in a circular ring, if the nozzles are arranged at equal intervals, there are other nozzles adjacent to each nozzle on both sides in the circumferential direction, and the relative positional relationship of the multiple nozzles is uniform, so this problem can be easily solved.

However, in the nozzle head 1 according to this embodiment, the first nozzle 34 and the second nozzle 35 have adjacent nozzles 3 only on one side, and no nozzles 3 on the other side. Therefore, the electric field formed around the first nozzle 34 and the second nozzle 35 may be significantly different from the electric field formed around the other nozzles 3. Therefore, in this embodiment, electrodes 4 are provided adjacent to each of the first nozzle 34 and the second nozzle 35, and are used as substitutes for the adjacent nozzles 3. In this embodiment, the nozzle 3 is a straight tube with an outer diameter of 0.8 mm, and the electrode 4 is a round bar with a diameter of 0.8 mm, so that the electrical properties of both can be considered to be substantially the same. By providing the electrode 4, the electrical environment of all the nozzles 3, including the first nozzle 34 and the second nozzle 35, can be made closer to uniform. This can improve the uniformity of the coating thickness.

However, providing electrode 4 may cause an overcurrent abnormality due to discharge from the tip of electrode 4. Therefore, in this embodiment, a cap 41 is attached to the tip of electrode 4 to suppress discharge from the tip of electrode 4.

As described above, the nozzle head 1 according to this embodiment overcomes the unique problems that can arise when multiple nozzles 3 are arranged in a straight line.

In addition, the nozzle head 1 configured as described above also provides the following effects. Note that the effects described below are not limited to cases where the nozzles 3 are arranged in a straight line.

In the nozzle head 1 according to this embodiment, the second portion 37 (length 1 mm) on the tip 32 side of the nozzle 3 is substantially non-conductive (FIG. 5). As a result, a voltage is applied only to the portion D1 at the tip 32 of the nozzle 3 through which the paint flows. The portion D1 does not include the substantial portion of the nozzle 3 (thickness 0.25 mm). On the other hand, in the conventional nozzle 3' (FIG. 6) in which all portions including the tip are conductive, a voltage is applied over the portion D2 corresponding to the outer shape of the conventional nozzle 3'. The portion D2 includes the substantial portion of the conventional nozzle 3'. That is, the difference between the two is whether or not the substantial portion of the nozzle is included in the portion to which the voltage is applied. The purpose of applying a voltage when performing electrostatic painting is to charge the paint droplets to be discharged, so there is no need for the substantial portion of the nozzle to be charged at the tip of the nozzle. Therefore, in this embodiment, the second portion 37 is configured to be non-conductive, so that an uneven electric field is concentrated only on the paint droplets at the tip 32 of the nozzle 3. As a result, the nozzle head 1 according to this embodiment efficiently charges the paint droplets, improving its ability to atomize the paint droplets compared to conventional nozzle heads.

In addition, since the nozzle head 1 is connected to the voltage application device via the main body part B, it is required that the high voltage applied to the base end 31 of the nozzle 3 does not drop as much as possible even at the tip 32. If a material that is substantially non-conductive is used for the entire nozzle, the only conductive path to the tip of the nozzle will be the paint, and a voltage drop will occur due to the electrical resistance of the paint. Therefore, as described above, it is preferable to use a material that is substantially non-conductive only for a small portion (second portion 37) on the tip 32 side of the nozzle 3.

In addition, among the various parts of the nozzle head 1, the nozzle 3, which is implemented as multiple thin tubes, is a location that is particularly susceptible to defects such as wear, deformation, and breakage. In the nozzle head 1 according to this embodiment, the first part 11, which includes the paint chamber 2, and the second part 12, which includes the tip 32 of the nozzle 3, are structured so that they can be easily attached and detached. Therefore, if a defect occurs in the nozzle 3, the defect can be repaired by replacing only the second part 12. This makes it easier to repair defects compared to conventional nozzle heads with an integrated configuration.

Other embodiments
Finally, other embodiments of the nozzle head for an electrostatic atomizer sprayer according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be combined with the configurations disclosed in other embodiments as long as no contradiction occurs.

In the above embodiment, a configuration has been described in which multiple nozzles 3 are arranged such that the openings 32a are arranged in a single straight line along the straight line X. However, in the present invention, the nozzles may be arranged in a single row or multiple rows. For example, in the nozzle head 1' according to the modified example shown in Figure 7, two rows of nozzles 3 are provided.

In the above embodiment, a configuration in which multiple on-off valve devices 21 are provided in the paint chamber 2 has been described as an example. However, in the present invention, on-off valve devices may not be provided, or a single on-off valve device may be provided that can open and close the connection between the nozzles and the paint chamber collectively for all of the multiple nozzles.

In the above embodiment, a configuration in which the second portion 37 on the tip 32 side of the nozzle 3 is made of insulating resin has been described as an example. However, in the present invention, the tip of the nozzle may be conductive, that is, the volume resistivity of the tip of the nozzle may be 10 ¹² Ω·cm or less. In this case, unlike the above embodiment, a nozzle made of the same material (a material with a volume resistivity of 10 ¹² Ω·cm or less) over its entire length may be used.

In addition, when the tip of the nozzle is provided with a second portion made of a material having a volume resistivity of 10 ¹⁴ Ω·cm or more, the method is not limited to the above embodiment. For example, the nozzle 3 ″ shown in FIG. 8 has a structure in which a nozzle cap 38 is attached to the tip of the conventional nozzle 3 ′ (FIG. 6). The nozzle cap 38 is an annular lid body made of a material having a volume resistivity of 10 ¹⁴ Ω·cm or more. By attaching the nozzle cap 38 to the conventional nozzle 3 ′, the part of the conventional nozzle 3 ′ functions as a first part made of a material having a volume resistivity of 10 ¹² Ω·cm or less, and the part of the nozzle cap 38 functions as a second part made of a material having a volume resistivity of 10 ¹⁴ Ω·cm or more. In this example, as with the nozzle 3 according to the above embodiment, a voltage can be applied only to the part D1 through which the paint flows. In addition, the nozzle cap 38 is provided with a skirt part 38 a that covers the side surface of the tip of the conventional nozzle 3 ′, so that the length of the insulated part of the surface of the conventional nozzle 3 ′ is long, and stable coating can be performed even when a high voltage is applied.

In the above embodiment, an example was described in which the difference between the first water head and the second water head is configured to be within 10% of the second water head. However, in the present invention, the mutual water head difference between multiple nozzles is not particularly limited.

In the above embodiment, an example has been described in which an electrode 4 is provided on the extension of each end of a linear row of multiple nozzles 3. However, in the present invention, an electrode may not be provided, or an electrode may be provided only on the extension of a portion of the ends of the linear row of multiple nozzles. In addition, in the above embodiment, an example has been described in which the electrode 4 is implemented as a metallic round rod with a diameter of 0.8 mm, but the shape of the electrode is not particularly limited. However, it is preferable that the outer shape of the electrode and the outer shape of the nozzle are the same.

In the above embodiment, a cap 41 is attached to the tip of the electrode 4, thereby insulating the tip of the electrode 4. However, when an electrode is provided in the present invention, there is no limitation on whether the tip is insulated or not.

In the above embodiment, an example has been described in which the forward extension length of the electrode 4 and the forward extension length of the nozzle 3 are the same. However, when an electrode is provided in the present invention, the extension length may be shorter or longer than the nozzle. Since the flight direction of the paint droplets can be changed depending on the length of the electrode, the length of the electrode can be appropriately selected according to the desired coating pattern. For example, if the electrode is attached in a manner that allows it to move back and forth along its extension direction, the position (extension length) of the electrode can be adjusted according to the desired coating pattern. Also, if multiple electrodes of different lengths are prepared and the electrodes are attached in a manner that allows them to be attached and detached, the length of the electrode to be used can be selected according to the desired coating pattern.

In the above embodiment, an example was described in which the nozzle head 1 has a structure in which the first part 11 and the second part 12 are detachable. However, the nozzle head for an electrostatic atomizing sprayer according to the present invention may have an inseparable, integrated structure.

As for other configurations, it should be understood that the embodiments disclosed in this specification are illustrative in all respects and that the scope of the present invention is not limited thereto. Those skilled in the art will easily understand that appropriate modifications are possible without departing from the spirit of the present invention. Therefore, other embodiments that are modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

The present invention can be used, for example, in a nozzle head for an electrostatic atomizing sprayer that paints a substrate by spraying paint.

1: nozzle head 11: first part 11a: space provided in first part 11 (capable of accommodating a part 33 of nozzle portion 3B)
12: Second part 13: Fixing part 2: Paint chamber 21: Opening/closing valve device 3: Nozzle 3A: Nozzle part (base end side)
3B: Nozzle part (tip side)
31: Base end of nozzle 3 32: Tip of nozzle 3 32a: Opening 33: Part of nozzle portion 3B (can be accommodated in space 11a of first part 11)
34: First nozzle 341: Connection portion between first nozzle 34 and paint chamber 2 35: Second nozzle 351: Connection portion between second nozzle 35 and paint chamber 2 36: First portion of nozzle 3 37: Second portion of nozzle 3 38: Nozzle cap 4: Electrode 41: Cap B: Main body P1: Paint supply passage P2: Paint return passage V1: Supply side changeover valve V2: Return side changeover valve

Claims (5)

Paint room and
a nozzle row including a plurality of nozzles arranged in a straight line, the nozzles being in fluid communication with the paint chamber and ejecting paint from an opening at the tip of the nozzle row;
electrodes provided on an extension of the nozzle row and adjacent to both ends of the nozzle row;
A nozzle head for an electrostatic atomizing coater , characterized in that the tip of the electrode is insulated . 2. The nozzle head for an electrostatic atomizer coater according to claim 1, wherein when the nozzle row is parallel to the vertical direction , a difference between a first head which is a head at a connection portion between a first nozzle arranged at a highest position and the paint chamber and a second head which is a head at a connection portion between a second nozzle arranged at a lowest position and the paint chamber is within 10% of the second head. The nozzle head for an electrostatic atomizing coating machine according to claim 1 or 2, wherein the nozzle has an inner diameter of 0.2 to 1.0 mm and a length of 5 to 100 mm. 4. The nozzle head for an electrostatic atomization coater according to claim 1 , wherein a first part including the paint chamber and a second part including the tip of the nozzle have a structure that allows them to be freely attached and detached. 5. The nozzle head for an electrostatic atomization coater according to claim 1 , further comprising an on-off valve device capable of opening and closing a connection portion between the paint chamber and the plurality of nozzles.

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