JP6005590B2 - Coating apparatus and coating method - Google Patents

Description

  The present invention relates to a multi-nozzle type coating apparatus and a coating method provided with a plurality of nozzles.

  In general, the coating 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. As one of the means, it is effective to spray the paint at a close distance. That is, by spraying while moving the nozzle at a distance of a few centimeters from the painted surface, it is possible to make the atomized paint particles collide with the painted surface at a high coating speed. It is possible to ensure 90% or more efficiency.

  However, when the distance from the nozzle to the painting surface is reduced, the painting 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).

JP 2000-167446 A

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).

  This invention is made | formed in view of the said situation, and makes it a subject to provide the coating apparatus and the coating method which are easy to perform uniform overcoating also by manual work.

  In order to solve the above problems, the nozzle head has a plurality of discharge ports to which the nozzles are respectively attached, a smaller number of paint introduction portions than the plurality of discharge ports, and a branch from the paint introduction portion toward the plurality of discharge ports. A coating device having a paint flow path, wherein the nozzles are arranged in a row on the nozzle head, and the arrangement of the nozzles is symmetric with respect to a central position of the row, The center-to-center distance between adjacent nozzles along the direction of the row satisfies the relationship that the center-to-center distance between the nozzles close to the center position is greater than or equal to the center-to-center distance between nozzles far from the center position. The coating apparatus is characterized in that the discharge amount of the applied paint is set to be larger as the nozzle is closer to the center position.

The center-to-center distance between adjacent nozzles along the row direction satisfies a 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 nozzles far from the center position. You can also.
It is also possible to adopt a configuration in which the distances between the centers of nozzles adjacent in the row direction are equal to each other.

  The number of the plurality of discharge ports is a power of two with respect to the number of the paint introduction portions, and the paint flow path is directed to any discharge port from the paint introduction portion toward the plurality of discharge ports. The first branch point, which is the same number of two branches in the path, excluding the first branch point that branches first after the paint introduction part and the last branch point that branches last before the plurality of discharge ports It is preferable that the sum of the cross-sectional areas of the flow paths after branching is equal to the cross-sectional area of the flow paths before branching at each branch point in the middle from the final branch point.

It is also possible to adopt a configuration in which the discharge amount is controlled by having different cross-sectional areas and lengths of the paint flow path from the final branch point to the plurality of discharge ports. In this case, the diameters of the paint flow paths in the nozzle may be equal to each other.
It is also possible to adopt a configuration in which the discharge amount is controlled by making the diameters of the paint flow paths in the nozzles different from each other. In this case, the cross-sectional area and the length of the paint flow path from the final branch point to the plurality of discharge ports may be equal to each other.

Preferably, the nozzle is a two-fluid nozzle having a paint flow path and an atomizing air flow path, and includes a cleaning unit that flushes the paint flow path and the atomizing air flow path with air or thinner.
It is preferable that a hand gun provided with the nozzle head is provided, and a coupler that can be attached to and detached from the hand gun with the cleaning unit with a single touch.
It is preferable that the direction of the nozzle head can be freely rotated.
It is preferable to provide rotating spacers for making the coating distance constant on both sides of the nozzle head.
Moreover, this invention provides the coating method using the said coating apparatus.

  According to the present invention, the closer to the center position, the greater the discharge amount of the paint discharged from the nozzle, so even if the peripheral portions of the coating pattern are overcoated, the coating thickness is excessive. Does not increase. This facilitates uniform overcoating even by hand.

BRIEF DESCRIPTION OF THE DRAWINGS 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, (b) Sectional drawing perpendicular | vertical to a coating surface. 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, (b) Sectional drawing perpendicular | vertical to a coating surface.

Hereinafter, based on a preferred embodiment, the present invention will be described with reference to the drawings.
In FIG. 1, an example (1st Embodiment) of the nozzle head used for the coating apparatus of this invention is shown. FIG. 1A is a sectional view parallel to the painted surface, and FIG. 1B is a 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 section is omitted.
1 includes a plurality of discharge ports 27, 27,... To which the nozzles 11, 12, 13, and 14 are respectively attached, and a smaller number of coating material introduction portions than the plurality of discharge ports 27, 27,. 20 and a paint flow path 16 that branches from the paint introduction part 20 toward a plurality of discharge ports 27, 27,.

  The paint introduction unit 20 is a single paint introduction unit that connects the paint flow paths of the paint supply system. In FIG. 1A, the coating material introduction part 20 is arranged at the approximate 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 main body 15, a paint flow path 16 is formed that branches from the paint introduction part 20 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, the same number of nozzles are arranged on the left and right sides of the coating material introduction portion 20 between one end 18 and the other end 19 of the head body 15 in a plan view parallel to the coating surface. As shown in FIG. 1B, these nozzles 11, 12, 13, and 14 are coated 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). Projecting in the discharge direction. The nozzle forming surface 17 is provided with a discharge port 27. The arrangement of these nozzles 11, 12, 13, and 14 is symmetric with respect to the center position C of the row as shown in FIG. 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. 1, the codes of the nozzles are distinguished from 11, 12, 13, and 14 in order from the center position C. The nozzle closest to the central position C is denoted by reference numeral 11, the nozzle farthest from the central position C is denoted by reference numeral 14, and the intervals between them are denoted by reference numerals 12 and 13. As shown in FIG.1 (b), the coating material flow path in each nozzle is formed on the center axis | shaft, and the coating material injection port has opened at the front-end | tip.

  As shown in FIG. 1A, the center-to-center distances L1, L2, L3, and L4 of the nozzles 11, 12, 13, and 14 adjacent in the row direction are the center-to-center distances of the nozzles close to the center position C. However, the relationship which becomes more than the distance between the centers of the nozzles far from the center 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. ≧ L4. 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 L1> L2> L3> L4.

  Further, as shown in FIG. 1B, the closer to the center position C, the larger the discharge amount Q1, Q2, Q3, Q4 of the paint discharged from each nozzle 11, 12, 13, 14 is set. . That is, Q1> Q2> Q3> Q4 where 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. As shown in FIG. 1A, the areas of the coating patterns 31, 32, 33, and 34 of 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 larger the discharge amount, the wider the coating pattern, and the smaller the discharge amount, the narrower the coating pattern.

  Thus, the closer to the center position, the larger the amount of paint discharged from the nozzle, so that the coating thickness increases excessively even when the peripheral portions of the coating pattern are overcoated. There is nothing. 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 channel is shown in FIG. 1, the atomizing air channel (not shown) is provided concentrically around the paint channel in the nozzles 11, 12, 13, and 14. An annular atomizing air injection port is opened at the tip of the atomizing air channel.

  Each of the nozzles 11, 12, 13, and 14 is supplied with paint from the paint flow path 16 and is supplied with atomized air from the atomizing air flow path to atomize the paint sprayed from the paint injection port. It atomizes and atomizes with the atomizing air injected from the air injection port. 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, specifically, eight times the number of the coating material introduction sections 20. The coating material flow path 16 in the head main body 15 bifurcates the same number from each other toward the plurality of discharge ports 27, 27,...

  As shown in FIG. 1A, the paint flow path 16 is a pair of primary branch flows that branch from the first branch point 24 at the downstream end of the single paint introduction section 20 and extend with the same flow path length. A pair of secondary branch channels 22, 22 that branch from the second branch point 25 at the downstream end of each primary branch channel 21 and extend at the same channel length, and each secondary branch A pair of tertiary branch channels 231, 232, 233, and 234 branch from a third branch point 26 at the downstream end of the 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 in the paint introduction section 20 at the center of the nozzle head 10 to form the primary branch flow paths 21 and 21. After being slightly bent substantially vertically, each reaches the second branch point 25. The paint flow path branches right and left from each second branch point 25 to form secondary branch flow paths 22, 22, which are bent slightly vertically and reach 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 channels 233 and 234 are disposed. Is arranged between the second branch point 25 and both ends 18 and 19 of the head body 15 in the left-right direction. Here, the left and right in FIG. 1A are the direction of the row 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.

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

  The primary branch channels 21 and 21 not only have the same channel length, but also have the same channel cross-sectional area. 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,. Excluding, at each branch point (second branch point 25) in the middle, the total cross-sectional area of the flow path after branching (secondary branch flow path 22) is the disconnection of the flow path before branching (primary branch flow path 21). By being equal to the 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. Thus, the discharge amounts Q1, Q2, Q3, Q4 from the nozzles 11, 12, 13, 14 are 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 wider 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.

  In FIG. 2, an example (2nd Embodiment) of the nozzle head used for the coating apparatus of this invention is shown. 2A is a cross-sectional view parallel to the painted surface, and FIG. 2B is a cross-sectional view perpendicular to the painted surface. In FIG. 2 (b), as in FIG. 1 (b), 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 the present 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 diameters D1, D2, D3, and D4 are increased as the nozzle is closer to the center position C. 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. It is. As a result, the relationship between the ejection amounts is also Q1> Q2> Q3> Q4. As in the first embodiment, the area of the coating patterns 31, 32, 33, 34 is wider as the discharge amount Q1, Q2, Q3, Q4 is larger, and the coating pattern is narrower as the discharge amount is smaller. .

  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 center distances L1, L2, L3, and L4 of the nozzles 11, 12, 13, and 14 adjacent in the row direction are equal to each other, and L1 = L2 = L3 = L4.

  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, the coating material supply balance at the time of bifurcating from the coating material introduction part 20 to the discharge port 27 is good, and it is easy to distribute equally. 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.

  The coating apparatus preferably 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 at the time of painting, it is preferable to have a coupler that can be attached and detached from the hand gun with a single touch.

  It is preferable that the direction of the nozzle head can be freely rotated. Thereby, the direction of a 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 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 in one row are arranged in the order of N1, N2, N3, N4, N2, N3 are nozzles close to the center, N1, N4 are nozzles far from the center, and between N2, N3 The center-to-center distance is greater than or equal to the center-to-center distance between N1, N2 and N3, N4, and the discharge amounts of N2, N3 are set larger than the discharge amounts of N1, N4.
When five nozzles in one row are arranged in the order of N1, N2, N3, N4 and N5, N3 is the nozzle closest to the center, N1 and N5 are nozzles farthest from the center, and N2, The center-to-center distance between 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 larger than the discharge amounts of N2 and N4, and the discharges of N2 and N4 The amount is 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. The same number of bifurcations can be performed on the route toward the exit.
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)

The nozzle head has a plurality of discharge ports to which the nozzles are respectively attached, a smaller number of paint introduction portions than the plurality of discharge ports, and a paint flow path that branches from the paint introduction portion toward the plurality of discharge ports. A painting device,
The nozzles are arranged in rows on the nozzle head, and the arrangement of the nozzles is symmetric with respect to the center position of the rows;
The distance between the centers of adjacent nozzles along the direction of the row satisfies a relationship in which the distance between the centers of the nozzles close to the center position is equal to or greater than the distance between the centers of the nozzles far from the center position.
The coating apparatus characterized in that the discharge amount of the paint discharged from the nozzle is set to be larger as the nozzle is closer to the center position.   The distance between the centers of adjacent nozzles along the direction of the row satisfies a relationship in which the distance between the centers of the nozzles close to the center position is larger than the distance between the centers of the nozzles far from the center position. The coating apparatus according to claim 1.   The coating apparatus according to claim 1, wherein distances between centers of nozzles adjacent to each other in the row direction are equal to each other. The number of the plurality of discharge ports is a power of two with respect to the number of the paint introduction parts,
The paint flow path is bifurcated from the paint introduction part toward the plurality of discharge ports, and the same number of branches in any of the discharge ports.
Each of the intermediate points 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 sum of the cross-sectional areas of the flow paths after branching is equal to the cross-sectional area of the flow paths before branching at the branch point.   The coating apparatus according to claim 4, wherein the discharge amount is controlled by having a cross-sectional area and a length of a paint flow path from the final branch point to the plurality of discharge ports different from each other. .   6. The coating apparatus according to claim 5, wherein the diameters of the paint flow paths in the nozzle are equal to each other.   The coating apparatus according to claim 4, wherein the discharge amount is controlled by the diameters of the paint flow paths in the nozzles being different from each other.   The coating apparatus according to claim 7, wherein a cross-sectional area and a length of the paint flow path from the final branch point to the plurality of discharge ports are equal to each other.   2. The nozzle according to claim 1, wherein the nozzle is a two-fluid nozzle having a paint channel and an atomizing air channel, and includes a cleaning unit that flushes the paint channel and the atomizing air channel with air or thinner. The coating apparatus of any one of -8.   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 a single touch.   The coating apparatus according to claim 1, wherein the direction of the nozzle head can be freely rotated.   The coating apparatus according to claim 1, further comprising a rotation spacer for making a coating distance constant on both sides of the nozzle head.   The coating method using the coating device of any one of Claims 1-12.

Images