WO2014199947A1 - Painting device and painting method - Google Patents

Abstract

This painting device is provided with a nozzle head (10) comprising: multiple discharge openings (27) to which nozzles (11, 12, 13, 14) are respectively attached; paint introduction sections (20) that are fewer in number than the multiple discharge openings; and paint flow channels (16) that branch so as to extend from the paint introduction sections to the multiple discharge openings. The nozzles are disposed on the nozzle head so as to form a row and the placement of the nozzles is symmetric with respect to the center position (C) of the row. The distances (L1, L2, L3, L4) between the centers of adjacent nozzles along the direction of the row satisfy the relationship that the distance between the centers of nozzles closer to the center position is equal to or greater than the distance between the centers of nozzles that are farther from the center position. The amount of paint discharged from the nozzle is set to be greater for the nozzles closer to the center position.

Description

Coating apparatus and coating method

The present invention relates to a multi-nozzle type coating apparatus and a coating method provided with a plurality of nozzles.
This application claims priority based on Japanese Patent Application No. 2013-122073 filed on June 10, 2013, the contents of which are incorporated herein by reference.

Generally, the spraying efficiency of spray coating is very low compared with brush coating or roller coating, and is about 50 to 60%. In order to improve the coating efficiency, it is necessary to reduce the coating pattern as much as possible and to increase the inertial force of the paint particles in the direction of the object to be coated. It is effective to spray the paint at a close distance as one means for increasing the inertial force of the paint particles. That is, by spraying while moving the nozzle a few centimeters away from the paint surface, it is possible to make the atomized paint particles collide with the paint surface at a high application speed. 90% or more can be secured.

However, when the distance from the nozzle to the paint surface is reduced, the paint pattern becomes extremely small. At this time, in order to make the coating film appropriately thin, it is necessary to reduce the discharge amount of the paint. In order to increase the coating area without reducing the production speed, a multi-nozzle type spray having a plurality of nozzles arranged at equal intervals is used (for example, see Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-167446

In recent years, due to a decrease in the number of veteran craftsmen and shortening of work time, the tendency to use painting equipment that eliminates human labor as much as possible has increased, and there is also a painting robot that fully automated processes such as moving the painting equipment and spraying paint. Has been introduced in the department. However, due to circumstances such as the complicated shape of the object to be coated and the difficulty of attaching the rail on which the painting robot moves to the outdoor structure, there are many situations in which an operator paints with a painting device in hand. .
When using a painting robot, it is easy to evenly paint a wide area by overlapping the coating pattern with the narrowest possible width. There is a problem that a high skill is required to make the thickness uniform (within an allowable range).

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coating apparatus and a coating method in which uniform overcoating is easy even by manual work.

The coating apparatus according to the first aspect of the present invention includes a plurality of discharge ports to which a plurality of nozzles are respectively attached, a coating material introduction portion having a number smaller than the number of the plurality of discharge ports, and the plurality of discharge ports from the paint introduction portion. And a plurality of nozzles arranged in a row on the nozzle head, wherein the plurality of nozzles are arranged at the center of the row. The center-to-center distance between the nozzles that are arranged symmetrically with respect to the position of the nozzle and that are adjacent to each other in the direction of the row With respect to the discharge amount of the paint discharged from the plurality of nozzles, the nozzle is closer to the center position, and the discharge amount is set so as to increase.

In the coating apparatus according to the first aspect of the present invention, the center-to-center distance between the nozzles adjacent in the row direction is such that the center-to-center distance between the nozzles close to the center position is far from the center position. It is preferable that a relationship larger than the distance between the centers of the nozzles is satisfied.
In the coating apparatus according to the first aspect of the present invention, it is preferable that distances between centers of the nozzles adjacent along the direction of the row are equal to each other.

In the coating apparatus according to the first aspect of the present invention, the number of the plurality of discharge ports is a power of two with respect to the number of the paint introduction portions, and extends from the paint introduction portion toward the plurality of discharge ports. In any of the paths in the paint flow path branched as described above, the number of branch points is the same as each other, and the first branch point that branches first after the paint introduction part and the front of the plurality of discharge ports At each branch point located midway from the first branch point to the final branch point, excluding the last branch point that branches at Preferably it is equal to the area.

In the coating apparatus according to the first aspect of the present invention, the cross-sectional areas of the paint flow paths from the final branch point to the plurality of discharge ports are different from each other, and from the final branch point to the plurality of discharge ports. It is preferable that the discharge amount is controlled by making the lengths of the paint flow paths different from each other.
In the coating apparatus of the first aspect of the present invention, it is preferable that the diameters of the paint flow paths in the nozzle are equal to each other.
In the coating apparatus of the first aspect of the present invention, it is preferable that the discharge amount is controlled by the diameters of the paint flow paths in the nozzles being different from each other.
In the coating apparatus according to the first aspect of the present invention, the cross-sectional areas of the paint flow paths from the final branch point to the plurality of discharge ports are equal to each other, and the paint from the final branch point to the plurality of discharge ports The lengths of the flow paths are preferably equal to each other.

In the coating apparatus of the first aspect of the present invention, the nozzle is a two-fluid nozzle having a paint channel and an atomizing air channel, and the paint channel and the atomizing air channel are flushed with air or thinner. It is preferable to provide a washing unit.
The coating apparatus according to the first aspect of the present invention preferably includes a hand gun provided with the nozzle head, and a coupler that can be attached to and detached from the hand gun with the cleaning unit with a single touch.
In the coating apparatus of the first aspect of the present invention, it is preferable that the direction of the nozzle head can be freely changed.
In the coating apparatus of the first aspect of the present invention, it is preferable to provide rotating spacers for making the coating distance constant on both sides of the nozzle head.
The coating method according to the second aspect of the present invention uses the coating apparatus according to the first aspect.

According to the above aspect of the present invention, the closer the nozzle is to the center position among the plurality of nozzles, the greater the amount of paint discharged from the nozzle is set. For this reason, even if it coats so that the peripheral parts of a coating pattern may overlap, the thickness of a coating film does not increase excessively. This facilitates uniform overcoating even by hand.

It is sectional drawing parallel to a coating surface which shows an example of the nozzle head of 1st Embodiment used for the coating apparatus of this invention. It is sectional drawing perpendicular | vertical to a coating surface which shows an example of the nozzle head of 1st Embodiment used for the coating apparatus of this invention. It is sectional drawing parallel to a coating surface which shows an example of the nozzle head of 2nd Embodiment used for the coating apparatus of this invention. It is sectional drawing perpendicular | vertical to a coating surface which shows an example of the nozzle head of 2nd Embodiment used for the coating apparatus of this invention.

Hereinafter, based on a preferred embodiment, the present invention will be described with reference to the drawings.
FIG. 1A and FIG. 1B show an example (first embodiment) of a nozzle head used in the coating apparatus of the present invention. FIG. 1A is a cross-sectional view parallel to the painted surface, and FIG. 1B is a cross-sectional view perpendicular to the painted surface. In FIG. 1B, the structure from the tertiary branch flow path to the nozzle is shown, and the structure of the paint introduction part and the primary branch flow path that should cross the same cross section as in FIG. 1B is omitted.
1A and 1B has a plurality of discharge ports 27, 27,... To which the nozzles 11, 12, 13, and 14 are respectively attached, and the number of the plurality of discharge ports 27, 27,. A small number of coating material introduction portions 20 and a coating material flow channel 16 branched from the coating material introduction portion 20 so as to extend toward the plurality of discharge ports 27, 27,.

The paint introduction part 20 is a single paint introduction part connected to the paint flow path of the paint supply system. In FIG. 1A, the coating material introduction part 20 is disposed at substantially the center of the nozzle head 10. The paint supply system feeds paint from a paint tank (not shown) toward the paint flow path of each nozzle. In the head body 15, a paint flow path 16 is formed that extends from the paint introduction part 20 and branches to a plurality of discharge ports 27, 27,.

The nozzles 11, 12, 13, and 14 are arranged in a row on the nozzle head 10. In FIG. 1A, in a plan view parallel to the coating surface, from one end 18 (first end) to the other end 19 (second end) of the head body 15 from the coating material introduction portion 20 toward each of the left and right directions. A nozzle is arranged. The number of nozzles arranged in the right direction from the paint introduction unit 20 is the same as the number of nozzles arranged in the left direction from the paint introduction unit 20. As shown in FIG. 1B, these nozzles 11, 12, 13, and 14 are discharged from one surface of the nozzle head 10 (surface disposed substantially parallel to the coating surface of the object to be coated, nozzle forming surface 17). Is formed to protrude. The nozzle forming surface 17 is provided with a discharge port 27. As shown in FIG. 1B, these nozzles 11, 12, 13, and 14 are arranged symmetrically with respect to the center position C of the row. In the present embodiment, eight nozzles are provided in one row, and four nozzles 11, 12, 13, and 14 are arranged on both sides of the center position C, respectively. In FIG. 1A and FIG. 1B, reference numerals 11, 12, 13, and 14 are sequentially attached to a plurality of nozzles from a position close to the center position C to a position far from the center position C, and the adjacent nozzles are distinguished. The nozzle closest to the central position C is indicated by reference numeral 11, the nozzle farthest from the central position C is indicated by reference numeral 14, and the nozzle located between the nozzle 11 and the nozzle 14 is directed from the nozzle 11 to the nozzle 14. In this direction (left and right direction), reference numerals 12 and 13 denote them in order. As shown in FIG. 1B, the paint flow path in each nozzle is formed on the central axis, and a paint injection port is opened at the tip of the nozzle.

As shown in FIG. 1A, the center-to-center distances L1, L2, L3, and L4 of the nozzles 11, 12, 13, and 14 that are adjacent to each other in the row direction are the center-to-center distances of the nozzles close to the center position C. The relationship that is greater than the distance between the centers of the nozzles far from the position is satisfied. The distance between the centers of the nozzles 11 and 11 is L1, the distance between the centers of the nozzles 11 and 12 is L2, the distance between the centers of the nozzles 12 and 13 is L3, and the distance between the centers of the nozzles 13 and 14 is L4. The relationship of ≧ L4 is satisfied. In the present embodiment, in particular, the distance between the centers of the nozzles close to the center position C satisfies a relationship greater than the distance between the centers of the nozzles far from the center position C, and the relationship of L1> L2> L3> L4 is satisfied. Yes.

In addition, as shown in FIG. 1B, the nozzle close to the center position C discharges the paint with a large discharge amount (so that the nozzle away from the center position C discharges the paint with a small discharge amount) Discharge amounts Q1, Q2, Q3, and Q4 of the paint discharged from the nozzles 11, 12, 13, and 14 are set. That is, assuming that the discharge amount of the nozzle 11 is Q1, the discharge amount of the nozzle 12 is Q2, the discharge amount of the nozzle 13 is Q3, and the discharge amount of the nozzle 14 is Q4, the relationship of Q1> Q2> Q3> Q4 is satisfied. As shown in FIG. 1A, the areas of the coating patterns 31, 32, 33, and 34 formed by the nozzles 11, 12, 13, and 14 are different depending on the magnitudes of the discharge amounts Q1, Q2, Q3, and Q4. . That is, the coating pattern formed by the paint discharged from the nozzle having a large discharge amount is wide, and the coating pattern formed by the paint discharged from the nozzle having a small discharge amount is narrow.

In this way, by setting the discharge amount of the paint discharged from the nozzle closer to the center position, even if the coating pattern is overlapped so that the peripheral portions overlap each other, the thickness of the coating film is reduced. Does not increase excessively. Therefore, uniform overcoating is facilitated even by manual work. Since the coating patterns 31, 32, 33, and 34 of adjacent nozzles overlap each other, it is difficult for unpainted parts to occur.

Each nozzle 11, 12, 13, 14 is preferably a two-fluid nozzle having a paint channel and an atomizing air channel. The head body 15 of the nozzle head 10 includes a paint supply system that supplies paint to the paint flow path of each nozzle, and an atomized air supply system that supplies atomized air to the atomization air flow path of each nozzle (not shown). And are connected. The atomizing air supply system supplies atomizing air (compressed air for atomization) from an unillustrated compressor toward the atomizing air flow path of each nozzle. The head body 15 has a single atomizing air supply port (not shown) for connecting the atomizing air flow path of the atomizing air supply system, and the atomizing air supply port branches to each nozzle. An atomizing air channel (not shown) is formed. Although only the paint flow path is shown in FIGS. 1A and 1B, the atomizing air flow path (not shown) is provided concentrically around the paint flow path in the nozzles 11, 12, 13, and 14. An annular atomizing air injection port is opened at the tip of the atomizing air channel.

By supplying paint from the paint flow path 16 to each nozzle 11, 12, 13, and 14 and by supplying atomized air from the atomizing air flow path, the paint sprayed from the paint injection port is injected into the atomized air. Atomized by atomized air jetted from the mouth and sprayed toward the paint surface. The sprayed paint particles are sprayed on the paint surface while forming, for example, a conical paint pattern in the spray direction of each nozzle.

In the present embodiment, the number of the plurality of discharge ports 27, 27,... Is a power of two, more specifically, eight times the number of the coating material introduction units 20. The paint flow path 16 in the head body 15 has one flow path from the paint introduction section 20 toward the plurality of discharge ports 27, 27,... Branches into two. In addition, the number of branch points in any route is the same.

As shown in FIG. 1A, the paint channel 16 has a pair of primary branch channels 21, 21, a pair of secondary branch channels 22, 22, and a pair of tertiary branch channels 231, 232, 233, 234. .
Here, the pair of primary branch channels 21 and 21 are branch channels that branch from the first branch point 24 located at the downstream end of the single coating material introduction unit 20 and extend with the same channel length.
The pair of secondary branch channels 22 and 22 are branch channels that branch from the second branch point 25 located at the downstream end of each primary branch channel 21 and extend with the same channel length.
The pair of tertiary branch channels 231, 232, 233, and 234 are branch channels that branch from the third branch point 26 located at the downstream end of each secondary branch channel 22.
The downstream ends of the tertiary branch flow paths 231, 232, 233, and 234 are discharge ports 27 to which the nozzles 11, 12, 13, and 14 are attached, respectively.

In the present embodiment, as shown in FIG. 1A, the paint flow paths branch left and right from the first branch point 24 located in the paint introduction section 20 at the center of the nozzle head 10 to form primary branch paths 21 and 21. The primary branch channels 21 and 21 are slightly bent substantially vertically, and then each of the primary branch channels 21 and 21 reaches the second branch point 25. The paint flow paths branch left and right from the respective second branch points 25 to form secondary branch flow paths 22 and 22, and the secondary branch flow paths 22 and 22 are bent slightly vertically and then the secondary branch flow paths. Each of 22 and 22 reaches the third branch point 26. Further, the paint channels are branched from each third branch point 26 to the left and right to form tertiary branch channels 231, 232, 233, and 234. Of the tertiary branch channels 231, 232, 233, and 234, the tertiary branch channels 231 and 232 are disposed between the first branch point 24 and the second branch point 25 in the left-right direction, and the tertiary branch channel 233 is Arranged between the second branch point 25 and one end 18 of the head body 15 (left direction), the tertiary branch channel 234 is disposed between the second branch point 25 and the other end 19 of the head body 15. Yes (right direction). Here, the left and right in FIG. 1A are directions of rows in which a plurality of nozzles are arranged. The tertiary branch flow paths 231, 232, 233, 234 reach the discharge port 27 after being slightly bent toward the nozzles 11, 12, 13, 14, as shown in FIG. 1B.

From the first branch point 24 to the third branch point 26, a paint flow path is formed in the same plane parallel to the nozzle forming surface 17. As shown in FIG. 1B, a paint channel perpendicular to the nozzle forming surface 17 is formed at a position in the middle of the tertiary branch channels 231, 232, 233, and 234. In the present embodiment, the paint channel formed in the same plane shown in FIG. 1A is configured by a channel parallel or perpendicular to the direction of the nozzle row, but the present invention is not limited to this. Instead, a paint channel extending obliquely with respect to the row direction may be provided.

The primary branch channels 21 and 21 have not only the same channel length but also the same channel cross-sectional area. Further, the secondary branch channels 22 and 22 have not only the same channel length but also the same channel cross-sectional area. The channel cross-sectional area of the secondary branch channel 22 is half the channel cross-sectional area of the primary branch channel 21. Since the number of secondary branch flow paths 22 is twice that of the primary branch flow paths 21, the total of the cross-sectional areas of the respective secondary branch flow paths 22 is equal to the cross-sectional area of each primary branch flow path 21. Is equal to the sum of

In this way, the first branch point 24 that branches first after the coating material introduction unit 20 and the final branch point (third branch point 26) that branches last before the plurality of discharge ports 27, 27,. Except for each branch point (second branch point 25) located in the middle, the total cross-sectional area of the flow path after branching (secondary branch flow path 22) is equal to that of the flow path before branching (primary branch flow path 21). By being equal to the cross-sectional area, the paint supply balance at the time of bifurcation is good and easy to distribute equally.

Furthermore, in this embodiment, the cross-sectional areas and lengths of the paint flow paths (tertiary branch flow paths 231, 232, 233, 234) from the final branch point (third branch point 26) to the discharge port 27 are different from each other. . Thereby, the discharge amount Q1, Q2, Q3, Q4 of the paint discharged from each nozzle 11, 12, 13, 14 is controlled. For example, the cross-sectional area of the tertiary branch flow paths 231 and 232 for supplying the paint to the two nozzles 11 and 12 near the center position C is the tertiary branch for supplying the paint to the two nozzles 13 and 14 far from the center position C. It is larger than the cross-sectional area of the flow paths 233 and 234. This facilitates the control to increase the discharge amounts Q1, Q2 of the nozzles 11, 12 compared to the discharge amounts Q3, Q4 of the nozzles 13, 14.

In addition, regarding the lengths of the two tertiary branch flow paths bifurcated from the same third branch point 26, the tertiary branch flow path 231 that supplies the paint to the nozzle 11 near the central position C is far from the central position C. It is shorter than the tertiary branch flow path 232 for supplying the paint to the nozzle 12. Similarly, the relationship between the tertiary branch flow paths 233 and 234 for supplying paint to the nozzles 13 and 14 is such that the tertiary branch flow path 233 is shorter than the tertiary branch flow path 234. Thereby, it is easy to control the discharge amount Q1 of the nozzle 11 to be larger than the discharge amount Q2 of the nozzle 12 and the discharge amount Q3 of the nozzle 13 to be larger than the discharge amount Q4 of the nozzle 14.

Since the paint discharge amounts Q1, Q2, Q3, and Q4 are controlled by the cross-sectional areas and lengths of the tertiary branch flow paths 231, 232, 233, and 234, the paint flow in each nozzle 11, 12, 13, and 14 is controlled. The path diameters D1, D2, D3, and D4 may be equal to each other. In this case, since the nozzle of the same dimension can be attached as each nozzle 11, 12, 13, 14, cost can be suppressed.

FIG. 2A and FIG. 2B show an example (second embodiment) of a nozzle head used in the coating apparatus of the present invention. 2A is a cross-sectional view parallel to the painted surface, and FIG. 2B is a cross-sectional view perpendicular to the painted surface. 2B, like FIG. 1B, a part of the structure is omitted, and the structure from the tertiary branch flow path to the nozzle is illustrated. Since the configuration of the second embodiment can be substantially the same as that of the first embodiment, the overlapping description will be omitted and the differences will be described below.

As shown in FIG. 2B, in this embodiment, the diameters D1, D2, D3, and D4 of the paint flow paths in the nozzles 11, 12, 13, and 14 are different from each other. Specifically, the sizes of the diameters D1, D2, D3, and D4 are set so that the diameter of the nozzle near the center position C is increased (so that the diameter of the nozzle away from the center position C is decreased). Has been. That is, D1> D2> D3> D4, where D1 is the paint channel diameter of nozzle 11, D2 is the paint channel diameter of nozzle 12, D3 is the paint channel diameter of nozzle 13, and D4 is the paint channel diameter of nozzle 14. The relationship is satisfied. Thereby, the relationship of Q1> Q2> Q3> Q4 is satisfied also regarding the relationship of the discharge amount. The area of the coating patterns 31, 32, 33, and 34 is the coating formed by the paint whose discharge amount is discharged from the nozzle according to the discharge amount Q1, Q2, Q3, and Q4 as in the first embodiment. The pattern is wide and the coating pattern formed by the paint discharged from the nozzle with a small discharge amount is narrow.

As described above, since the discharge amount is changed by the design of the nozzles 11, 12, 13, and 14, the paint flow path 16 in the head body 15 is configured so that the paint is evenly distributed to the discharge ports 27. be able to. On the nozzle head 100, the nozzles 11, 12, 13, and 14 are arranged at equal intervals. That is, as shown in FIG. 2A, the distances L1, L2, L3, and L4 between the centers of the nozzles 11, 12, 13, and 14 adjacent in the row direction are equal to each other, and L1 = L2 = L3 = L4. Is satisfied.

Further, the cross-sectional area and the length of the flow path from the first branch point 24 to the third branch point 26 are not only equal to those in the first embodiment, but also from the third branch point 26 which is the final branch point. The cross-sectional area and the length of the paint channel (third branch channel 23) up to the discharge port 27 are configured to be equal to each other. That is, at the second branch point 25, the total cross-sectional area of the flow path after branching (secondary branch flow path 22) is not only equal to the cross-sectional area of the flow path before branching (primary branch flow path 21). Also at the third branch point 26, the total cross-sectional area of the flow path after branching (third branch flow path 23) is equal to the cross-sectional area of the flow path before branching (secondary branch flow path 22). Thereby, in the plurality of flow paths from the paint introduction unit 20 to the discharge port 27, the paint supply balance when one flow path is branched into two is good, and the paint flowing in the flow path is branched into a plurality. It is easy to distribute evenly in each flow path. In this case, since the main factor of the change in the discharge amount is the difference in the nozzle diameter, it is easy to control the discharge amount.

As mentioned above, although this invention has been demonstrated based on suitable embodiment, this invention is not limited to the above-mentioned embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

The coating apparatus preferably includes a cleaning unit that flushes the paint channel and the atomizing air channel in the two-fluid nozzle with air or thinner. By flowing thinner through the paint channel, the paint can be dissolved and removed. Further, the paint channel can be dried by flowing air through the paint channel. Normally, only air flows through the atomizing air flow path, and thus cleaning is not necessary. However, paint may adhere and enter from the tip of the nozzle. For this reason, it is preferable to remove the adhering paint by flowing thinner into the atomizing air channel to dissolve the paint or to blow it off with the pressure of air. The thinner can appropriately select a low-polar or high-polar organic solvent depending on components such as a resin and a pigment contained in the paint.

It is preferable that the coating apparatus includes a hand gun provided with a nozzle head so that an operator can hold it in his hand. The hand gun is preferably provided with an operation unit for adjusting the flow rate of the paint or atomized air at hand. Since the cleaning unit does not need to be attached to the hand gun at the time of painting, it is preferable to have a coupler that can be attached to and detached from the hand gun with one touch.

It is preferable that the orientation of the nozzle head can be freely changed (rotated). Thereby, the direction of a pattern (painting pattern) can be changed easily. Examples of the orientation of the painted surface include a horizontal surface, a vertical surface, and an inclined surface. The direction in which the paint is sprayed from the nozzle onto the paint surface is arbitrary, such as laterally, upwardly, downwardly, and obliquely. When a hand gun is provided, it is preferable to provide a rotation mechanism between the grip portion and the nozzle head so that the orientation of the nozzle head can be changed (rotated) without changing the orientation of the grip portion that the operator holds.

It is preferable to provide rotating spacers for making the coating distance constant on both sides of the nozzle head. The rotating spacer has a wheel-like appearance, for example, and can rotate the nozzle head in parallel by rotating on the painted surface.
In the illustrated nozzle head, the plurality of nozzles are arranged in one row, but may be arranged in two or more rows.
The nozzle forming surface is a flat surface in the illustrated example, but may have irregularities, undulations, and a curved surface. In the illustrated example, the discharge port to which the nozzle is attached is formed on the nozzle formation surface. However, the discharge port is provided at the bottom of the recess recessed from the nozzle formation surface, and a part of the nozzle is embedded in the recess. You can also.

The number of nozzles arranged in a row on the nozzle head may be even or odd. If four or more nozzles are arranged in one row, the present invention can be applied.
For example, when four nozzles N1, N2, N3, and N4 are arranged in sequence, N2, N3 are nozzles that are close to the center, and N1, N4 are nozzles that are far from the center. In this case, the center-to-center distance between N2 and N3 is equal to or greater than the center-to-center distance between N1 and N2 and between N3 and N4, and the discharge amounts of N2 and N3 are set larger than the discharge amounts of N1 and N4.
In addition, when five nozzles N1, N2, N3, N4, and N5 are arranged in sequence, N3 is the nozzle closest to the center, and N1 and N5 are nozzles farthest from the center. In this case, the center-to-center distance between N2 and N3 and between N3 and N4 is equal to or greater than the center-to-center distance between N1 and N2, and between N4 and N5, the discharge amount of N3 is greater than the discharge amount of N2 and N4, and The discharge amounts of N2 and N4 are set larger than the discharge amounts of N1 and N5.

The number of coating material introducing portions provided in the nozzle head may be one, two, three, or more. Since the number of the plurality of discharge ports is a power of 2 (4 times, 8 times, 16 times, etc.) with respect to the number of the paint introduction portions, any discharge from the paint introduction portion toward the plurality of discharge ports. In the path toward the outlet, one flow path is branched into two. In addition, the number of branch points in any route is the same.
The nozzles branched from one paint introduction part may be arranged in one row. The nozzles branched from one paint introduction part may be divided into a plurality of rows such as two rows.

Examples of each member constituting the nozzle include metals such as stainless steel and tinplate from the viewpoint of durability against water, thinner, etc., cleanability, and mechanical strength.
The coating apparatus and the coating method of the present invention can also be applied to various structures such as automobiles and machines, or large structures such as bridges, gas tanks, buildings, and ships.

C ... Center position of the row, D1, D2, D3, D4 ... Nozzle paint channel diameter, L1, L2, L3, L4 ... Nozzle center distance, Q1, Q2, Q3, Q4 ... Nozzle paint Discharge amount, 10, 100 ... Nozzle head, 11, 12, 13, 14 ... Nozzle, 15 ... Head body, 16 ... Paint flow path, 17 ... Nozzle formation surface, 18 ... End (one end) of head body, 19 ... Head End (the other end) of the main body, 20 ... Paint introduction part, 21 ... Primary branching channel, 22 ... Secondary branching channel, 23, 231, 232, 233, 234 ... Tertiary branching channel, 24 ... First branching point 25 ... second branch point, 26 ... third branch point, 27 ... discharge port, 31, 32, 33, 34 ... paint pattern.

Claims (13)

1. A painting device,
   A plurality of discharge ports to which a plurality of nozzles are respectively attached, a paint introduction portion having a number smaller than the number of the plurality of discharge ports, and a paint flow branched so as to extend from the paint introduction portion toward the plurality of discharge ports A nozzle head having a path,
   The plurality of nozzles are arranged in a row on the nozzle head, and the plurality of nozzles are arranged symmetrically with respect to a central position of the row,
   The distance between the centers of the nozzles adjacent along the direction of the row satisfies the relationship in which the distance between the centers of the nozzles close to the center position is not less than the distance between the centers of the nozzles far from the center position,
   With respect to the discharge amount of the paint discharged from the plurality of nozzles, the coating apparatus is set such that the discharge amount is increased as the nozzle is closer to the center position.
2. The center-to-center distance between the nozzles adjacent in the row direction satisfies the relationship in which the center-to-center distance between the nozzles close to the center position is larger than the center-to-center distance between the nozzles far from the center position. The coating apparatus according to claim 1.
3. The coating apparatus according to claim 1, wherein the center-to-center distances of the nozzles adjacent in the row direction are equal to each other.
4. The number of the plurality of discharge ports is a power of two with respect to the number of the paint introduction parts,
   In any path in the paint flow path branched so as to extend from the paint introduction part toward the plurality of discharge ports, the number of branch locations is mutually the same,
   Located in the middle from the first branch point to the final branch point, excluding the first branch point that branches first after the paint introduction part and the final branch point that branches last before the plurality of discharge ports. The coating apparatus according to any one of claims 1 to 3, wherein the total cross-sectional area of the flow path after branching is equal to the cross-sectional area of the flow path before branching at each branch point.
5. The cross-sectional areas of the paint flow paths from the final branch point to the plurality of discharge ports are different from each other, and the lengths of the paint flow paths from the final branch point to the plurality of discharge ports are different from each other. The coating apparatus according to claim 4, wherein the discharge amount is controlled.
6. The coating apparatus according to claim 5, wherein the diameters of the paint flow paths in the nozzle are equal to each other.
7. The coating apparatus according to claim 4, wherein the discharge amount is controlled by different diameters of the paint flow paths in the nozzle.
8. The cross-sectional areas of the paint flow paths from the final branch point to the plurality of discharge ports are equal to each other, and the lengths of the paint flow paths from the final branch point to the plurality of discharge ports are equal to each other. The coating device described in 1.
9. The said nozzle is a two-fluid nozzle which has a coating material flow path and an atomization air flow path, The cleaning unit which flushes the said coating material flow path and the said atomization air flow path with air or a thinner is provided. The coating apparatus as described in any one.
10. The coating apparatus according to claim 9, further comprising: a hand gun provided with the nozzle head, and a coupler that can be attached to and detached from the hand gun with the cleaning unit with a single touch.
11. The coating apparatus according to any one of claims 1 to 10, wherein a direction of the nozzle head can be freely changed.
12. The coating apparatus according to any one of claims 1 to 11, further comprising a rotation spacer for making a coating distance constant on both sides of the nozzle head.
13. A coating method using the coating apparatus according to any one of claims 1 to 12.

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