JP6783366B1 - Painting machine, painting system, and painting machine control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating machine and a coating system capable of forming a coating film having a uniform film thickness and having high coating efficiency and work efficiency. SOLUTION: A nozzle group 4 composed of a plurality of air atomizing nozzles 3 for ejecting paint, and a control unit 5 for switching between the ejection state and the non-ejection state of each of the plurality of air atomization nozzles 3 are provided, and a plurality of airs are provided. The atomizing nozzles 3 are arranged on a flat surface or a curved surface. [Selection diagram] Fig. 1

Description

The present invention relates to a coating machine capable of painting an automobile, a railroad vehicle, an aircraft, etc., a coating system, and a coating machine control method.

As a conventional coating machine, for example, an air atomizing coating machine using compressed air and a rotary atomizing coating machine are well known. Each of these coating machines has one nozzle, and the amount of paint discharged during painting is set to approximately 100 cc / min to 400 cc / min. Further, the spray pattern of the air atomizing coating machine or the rotary atomizing coating machine is usually in a ring shape or an elongated shape.
Since such an air atomizing coating machine and a rotary atomizing coating machine are widely known, the prior art documents are not disclosed.

According to a conventional coating machine, the amount of paint discharged per nozzle is large, and a large amount of compressed air is required. For this reason, there is a problem that the air around the coating machine is easily attracted, the paint is scattered, and the coating efficiency is lowered.

For example, when the spray pattern S has a ring shape as shown in FIG. 11, the cross-sectional shape of the coating film when applied in a certain direction is a mountain shape (see FIG. 12A) or as shown in FIG. It has an uneven distribution shape such as a lid mountain shape (see FIG. 12B), and the film thickness tends to be uneven.

Further, as shown in FIG. 13, when the spray pattern S is an elongated type, the cross-sectional shape of the coating film when applied in a certain direction is trapezoidal and the film thickness is substantially uniform, but the dashed arrow in FIG. As shown, when changing the coating direction, it is necessary to change the angle of the coating machine itself, so there is room for improvement in terms of work efficiency.

Further, when the paint is repeatedly applied to the object to be coated, the coating is usually performed in a plurality of times. At that time, as shown in FIG. 14, the coating film is applied by shifting the position of the coating machine by the length (L) of 1 / (number of times of repeated coating) of the spray pattern size, but the film thickness of the coating film is made uniform. In order to do so, as shown in FIG. 15, it is necessary to slightly protrude the end portion of the object to be coated and paint, and the paint on the protruding portion is wasted.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a coating machine and a coating system capable of forming a coating film having a uniform film thickness and having high coating efficiency and work efficiency. There is.

A feature of the coating machine according to the present invention is that it includes a nozzle group composed of a plurality of air atomizing nozzles for ejecting paint, and a control unit for switching between the ejection state and the non-ejection state of each of the plurality of air atomization nozzles. The plurality of air atomization nozzles are arranged on a flat surface or a curved surface , and each of the plurality of air atomization nozzles has one discharge port .

Since the air atomization nozzle has a small number of small particle size paint mists, the paint does not easily scatter, and as a result, the coating efficiency is improved.

Since each of the multiple air atomization nozzles can switch between the discharge state and the non-discharge state by the control unit, the size and shape of the spray pattern can be freely changed by selecting and discharging a specific nozzle. it can. Therefore, for example, it is possible to select the nozzles so that the number of nozzles ejected in the direction along the moving direction of the coating machine is constant in each row in the direction orthogonal to the moving direction of the coating machine. The film thickness of the coating film becomes uniform throughout. Further, when performing recoating, the nozzle should be selected so that the number of recoatings is constant, the film thickness of the coating film is uniform, and the coating film does not protrude at the edge of the object to be coated. You can also do this, so you don't waste paint. Furthermore, when changing the painting direction, it is sufficient to change the protruding nozzle, and it is not necessary to change the angle of the painting machine itself, so that the work efficiency is improved.

In the coating machine according to the present invention, the plurality of air atomization nozzles are arranged so that the spray pattern when all of them are in the ejection state is a regular polygonal shape, a rectangular shape, a parallel quadrilateral shape, or a circular shape. Suitable.

In the coating machine according to the present invention, the spray pattern when all of the plurality of air atomization nozzles are in the ejection state is not particularly limited to any shape. However, when the spray pattern is, for example, a regular polygon, it is easy to apply to an object to be coated having a coating range shape whose coating change direction is equal to the outer angle of the regular polygon, and when the spray pattern is square or rectangular. It is easy to apply to an object to be coated having a coating range shape having an angle of 90 ° in the coating change direction, such as a rectangular outer shape of the coating range. Further, when the spray pattern is a parallelogram, for example, the outer shape of the coating range is a parallelogram, and the spray pattern is applied to an object to be coated having a quadrangular coating range shape having parallel opposite sides and an arbitrary coating change direction. easy. Further, when the spray pattern is, for example, a circular shape, it is easy to apply to a coating material having a curved outer shape in the coating range.

In the coating machine according to the present invention, it is preferable that the coating discharge amount of each of the plurality of air atomization nozzles is 15 cc / min or less.

According to this configuration, the amount of paint discharged per nozzle is about one-tenth or less of that of a conventional painting machine, and a small amount of paint can be applied, so that the paint is less likely to scatter and is applied. Wearing efficiency is further improved.

The features of the coating system according to the present invention are a coating machine having the above characteristics, a support means for supporting and moving the nozzle group, a paint supply means for supplying paint to the nozzle group, and air to the nozzle group. The point is that it is provided with an air supply means for supplying air.

According to this configuration, the entire surface can be painted even on a large object to be coated such as an automobile, a railroad vehicle, and an aircraft.

In the coating system according to the present invention, the air atomizing nozzles are switched to the non-ejection state so that the number of the air atomizing nozzles in the discharging state gradually decreases as the coating machine approaches the coating direction change position. As the coating machine reaches the coating direction change position, the coating direction is changed at a predetermined angle, and the coating machine moves away from the coating direction change position, the air atomization nozzle in a discharge state is formed. It is preferable that the air atomization nozzle is controlled by the control unit so that the air atomization nozzle is switched to the discharge state so that the number of the air atomization nozzles gradually increases.

According to this configuration, when the painting direction is changed during painting, the painting can be smoothly performed without changing the angle of the painting machine itself at the painting direction changing position.

A feature of the coating machine control method according to the present invention is that in a coating machine having the above characteristics, the number of the air atomizing nozzles in the discharging state is determined by setting the coating discharge amount per the air atomizing nozzle. The point is to control the flow rate of the paint supplied to the nozzle group accordingly.

It is a schematic block diagram of a painting system. It is a schematic block diagram when the multi-nozzle part which the spray pattern has a regular hexagonal shape is seen from the front. It is a schematic block diagram when the multi-nozzle part which the spray pattern has a square shape is seen from the front. It is a figure which shows typically the example of the normal coating by the coating machine of this invention. It is sectional drawing of the arrow line VV in FIG. It is a figure which shows typically an example of the coating method when the spray pattern forms a circular shape. It is a figure which shows typically the example of the recoating coating by the coating machine of this invention. It is a figure which shows typically the example (the 1st method) of the coating direction change coating by the coating machine of this invention. It is a figure which shows typically the example (second method) of the coating direction change coating by the coating machine of this invention. It is a figure which shows typically the example (the third method) of the coating direction change coating by the coating machine of this invention. It is a figure which shows typically an example of the conventional normal coating. It is sectional drawing of the arrow line XII-XII in FIG. It is a figure which shows typically an example of the conventional coating direction change coating. It is a figure which shows an example of the conventional overcoating typically. It is sectional drawing of the arrow line XV-XV in FIG.

[Embodiment]
(Painting system)
An embodiment according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the coating system 1 in the present embodiment includes a coating machine 2, a robot arm 6 (supporting means) for supporting and moving the multi-nozzle portion 4 of the coating machine 2, and a multi-nozzle portion 4. A paint supply means (not shown) for supplying paint and an air supply means (not shown) for supplying air to the multi-nozzle unit 4 are provided.

The coating machine 2 determines the ejection state and the non-ejection state of the multi-nozzle unit 4 (nozzle group) including the plurality of air atomizing nozzles 3 for discharging the paint and the plurality of air atomizing nozzles 3 in the multi-nozzle unit 4. A plurality of air atomization nozzles 3 are arranged on a flat surface or a curved surface, including a controller 5 (control unit) for switching. The air atomization nozzle 3 may have a known configuration, and is not particularly limited.

In the air atomization nozzle 3, in order to improve the coating efficiency of the paint, the nozzle structure is made so that it is difficult to attract the ambient air by denting the discharge port of the paint and the air, or the speed in the spray spindle direction is further suppressed. It is desirable to have such a configuration.

Further, in the present embodiment, the multi-nozzle unit 4 and the controller 5 are separately configured, but the present invention is not limited to this, and the controller 5 is incorporated into the multi-nozzle unit 4 and integrated. Is also good.

The arrangement shape of the plurality of air atomization nozzles 3 is not particularly limited, but the spray pattern when all the air atomization nozzles 3 are in the discharge state is, for example, a regular polygonal shape, a rectangular shape, or a parallel quadrilateral shape. Alternatively, it is desirable to arrange them in a circular shape. When the spray pattern is, for example, a regular polygon, it is easy to apply to an object to be coated having a coating change direction equal to the outer angle of the regular polygon (for example, the coating change direction is 60 ° in a regular hexagon). Further, in the case of a square shape or a rectangular shape, it is easy to apply to an object to be coated having a coating range shape having an angle of 90 ° in the coating change direction, such as a rectangular outer shape of the coating range. Further, when the spray pattern is a parallelogram, for example, the outer shape of the coating range is a parallelogram, and the spray pattern is applied to an object to be coated having a quadrangular coating range shape having parallel opposite sides and an arbitrary coating change direction. easy. Further, when the spray pattern is, for example, a circular shape, it is easy to apply to a coating material having a curved outer shape in the coating range.

As a more specific example, for example, those arranged in a dot matrix so as to have a regular hexagonal shape as shown in FIG. 2 or a square shape as shown in FIG. 3, or arranged in a close-packed manner. Examples include the ones. According to these configurations, a gap, which is an uncoated portion, is unlikely to occur between the coating portion discharged from one nozzle and the coating portion discharged from another nozzle adjacent to the nozzle, and the paint is applied. Can be applied in a denser state. However, the shape of the spray pattern and the arrangement shape of the plurality of air atomization nozzles 3 are not necessarily limited to these, and may be appropriately changed according to the shape of the object to be coated, the coating specifications, and the like.

A known robot arm may be used as the robot arm 6, and the multi-nozzle portion 4 of the coating machine 2 is attached to the tip portion of the robot arm 6. The robot arm 6 is not particularly limited, but a robot arm capable of painting in the vertical direction and / or the lateral direction is desirable, and examples of such a robot arm include orthogonal biaxial type and orthogonal 3 An axial type or an articulated 6-axis type robot arm can be mentioned.

The paint supply means includes a paint supply pump, a paint supply tank, a paint supply hose, and the like. By driving the paint supply pump, the paint in the paint supply tank is supplied to the multi-nozzle portion 4 of the coating machine 2 via the paint supply hose.

It is desirable that the amount of paint discharged from each air atomizing nozzle 3 is 15 cc / min or less. In a conventional coating machine, the required paint ejection amount is 100 cc / min to 400 cc / min, and a relatively large amount of air is required to atomize the paint. However, in the present embodiment, since the paint discharge amount of each air atomization nozzle 3 is as small as 15 cc / min or less, the air consumption amount with respect to the paint discharge amount can be small.

The air supply means includes a compressor, an air hose, and the like. The air compressed by the compressor is supplied to the multi-nozzle portion 4 of the coating machine 2 via the air hose, so that the paint similarly supplied to the multi-nozzle portion 4 is atomized from the plurality of air atomizing nozzles 3. Be sprayed.

The amount of air supplied to each air atomization nozzle 3 is preferably 20 L / min to 30 L / min. In a conventional coating machine, the atomized paint particle size has a certain distribution range, and it is difficult to apply the atomized paint particles to the object to be coated, and the paint particles are oversprayed by the surrounding airflow. There is a limit to the rate improvement. On the other hand, in the present embodiment, since the amount of air is relatively small, the particle size distribution width of the discharged coating material is small, and as a result, the number of coating particles having a small particle size is reduced, so that overspray is almost eliminated.

It is desirable that the compressed air is configured to be blown out in a spiral shape from each air atomization nozzle 3. As a result, the force of the air is weakened, so that the coating efficiency of the paint is further improved.

The controller 5 of the coating machine 2 controls to switch between the ejection state and the non-ejection state of each of the plurality of air atomization nozzles 3, and also controls the paint supply means and / or the air supply means to discharge the amount of paint. And / or may be configured to control the discharge pressure. Further, the controller 5 of the coating machine 2 sets the amount of paint to be discharged per one of the air atomizing nozzles 3, so that the paint supplied to the nozzle group is supplied according to the number of air atomizing nozzles 3 in the discharged state. It is desirable to control the flow rate.

The coating distance between the multi-nozzle portion 4 of the coating machine 2 and the object to be coated 7 is preferably 20 mm to 50 mm. The distance from the coated material in the conventional coating machine is generally 200 mm to 300 mm, but in the coating machine according to the present invention, the coating can be performed at a shorter distance than the conventional one, and the coating efficiency of the paint is further improved. To do.

(Painting method)
1. 1. Normal coating An example of performing normal coating using the coating machine of the present invention will be described with reference to FIG.
Here, as shown in FIG. 2, a multi-nozzle portion in which a plurality of air atomizing nozzles 3 are arranged in the most dense manner and the spray pattern when all the air atomizing nozzles 3 are in the ejection state has a regular hexagonal shape. An example of using a coating machine provided with 4 will be described.

As shown in FIG. 2, the multi-nozzle unit 4 in the present embodiment includes a total of 91 air atomization nozzles 3. That is, 11 rows are provided in the Y-axis direction, and 6 pieces, 7 pieces, 8 pieces, 9 pieces, 10 pieces, 11 pieces, 10 pieces, 9 pieces, 8 pieces, 7 pieces, and 6 pieces are provided in order from the bottom. The air atomization nozzle 3 is arranged.

In FIG. 4, the portion indicated by the black circle indicates the air atomizing nozzle 3 in the discharged state, and the portion indicated by the white circle indicates the air atomizing nozzle 3 in the non-ejected state. When the coating direction is the X-axis direction, as shown by the black circles in FIG. 4, the number of air atomizing nozzles 3 in the discharge state in the X-axis direction is the same in each row in the Y-axis direction. The controller 5 controls a plurality of air atomization nozzles 3 in the multi-nozzle unit 4 to switch between a discharge state and a non-discharge state of each air atomization nozzle 3.

In the present embodiment, an example is shown in which the number of air atomizing nozzles 3 in the discharge state in the X-axis direction is controlled to be six. That is, in the multi-nozzle unit 4, all six air atomization nozzles 3 are in the discharge state in each of the uppermost and lowermost rows in the Y-axis direction, and the other rows are the air atomization nozzles 3 on the inner side. Is in the non-discharging state, and the air atomizing nozzles 3 from the outside to the third are controlled to be in the discharging state.

In this controlled state, as shown in FIG. 4, the coating machine is moved in the X-axis direction with respect to the object to be coated 7 to perform coating, so that the object to be coated 7 is uniform as shown in FIG. A coating film 8 having a film thickness is formed on the object to be coated 7.

Next, an example will be described in which a coating machine including the multi-nozzle portion 4 having a circular spray pattern when all the air atomization nozzles 3 are in the discharge state is used. The coating machine is suitable, for example, when applying a coating material having a curved outer shape in the coating range.

In this case, as shown in FIG. 6, the multi-nozzle portion is moved so that the spray pattern S is in contact with the outer line N of the coating range, and only the air atomizing nozzle 3 (black circle) on the vertical line in contact with the outer line N is discharged. The painting machine may be controlled so that the state is reached.

2. Overcoating An example of performing overcoating using the coating machine of the present invention will be described with reference to FIG. 7. FIG. 7 shows an example in which the same coating machine used in the above-mentioned normal coating is used to perform three recoatings.

When the coating direction is the X-axis direction, as shown by the black circle on the first stroke, the six air atomization nozzles 3 of the multi-nozzle portion 4, that is, so that the coating does not protrude at the end of the object to be coated, that is, Two air atomization nozzles 3 in the X-axis direction and three rows of air atomization nozzles 3 in the Y-axis direction are selected. Then, in a state where only these air atomization nozzles 3 are controlled to be in the discharge state, the coating machine is moved from the left end of the upper end of the object to be coated 7 to the right side for coating. When the coating to the right end of the object to be coated 7 is completed, the first stroke is completed.

Next, the coating machine is moved so that the position of the multi-nozzle portion 4 shifts downward by three rows in the Y-axis direction. Twelve air atomization nozzles 3 of the multi-nozzle portion 4, that is, two air atomization nozzles 3 in the X-axis direction and six rows of air atomization nozzles 3 in the Y-axis direction so that the end portion of the object to be coated does not protrude. Is selected. In a state where only these air atomization nozzles 3 are controlled to be in the discharge state, painting is performed from the right end to the left side of the upper end of the object to be coated 7. When the painting to the left end of the object to be coated 7 is completed, the second stroke is completed.

Next, the coating machine is moved so that the multi-nozzle portion 4 is further lowered by three rows in the Y-axis direction. Eighteen air atomization nozzles 3 of the multi-nozzle portion 4, that is, two air atomization nozzles 3 in the X-axis direction and nine rows of air atomization nozzles 3 in the Y-axis direction so that the end portion of the object to be coated does not protrude. Is selected. In a state where only these air atomization nozzles 3 are controlled to be in the discharge state, painting is performed from the left end of the upper end of the object to be coated 7 to the right side. When the coating to the right end of the object to be coated 7 is completed, the third stroke is completed.

The movement corresponding to the above three strokes is repeated up to the ninth stroke by reciprocating the object 7 to be coated in the X-axis direction.

Then, at the 10th stroke, the coating machine is moved so that the multi-nozzle portion 4 is further lowered by three rows in the Y-axis direction. Twelve air atomization nozzles 3 of the multi-nozzle portion 4, that is, two air atomization nozzles 3 in the X-axis direction and six rows of air atomization nozzles 3 in the Y-axis direction so that the end portion of the object to be coated does not protrude. Is selected. In a state where only these air atomization nozzles 3 are controlled to be in the discharge state, painting is performed from the right end to the left side of the object to be coated 7. When the painting to the left end of the object to be coated is completed, the 10th stroke is completed.

Finally, at the 11th stroke, the coating machine is moved so that the multi-nozzle portion 4 is further lowered by three rows in the Y-axis direction. The six air atomization nozzles 3 of the multi-nozzle portion 4, that is, two air atomization nozzles 3 in the X-axis direction and three rows of air atomization nozzles 3 in the Y-axis direction so that the end portion of the object to be coated does not protrude. Is selected. In a state where only these air atomization nozzles 3 are controlled to be in the discharge state, painting is performed from the left end to the right side of the lower end of the object to be coated 7. When the painting to the right end of the object to be coated 7 is completed, the painting is completed.

According to the above-mentioned coating method, the multi-nozzle portion 4 is recoated three times for each of the three rows of the multi-nozzle portions 4 in the Y-axis direction. That is, a coating film 8 having no overhang coating and having a uniform film thickness corresponding to three times of repeated coating is formed over the entire object to be coated.

3. 3. Coating direction changing coating An example of performing coating direction changing coating using the coating machine of the present invention will be described with reference to FIGS. 8 to 10. In the coating machine used here, as shown in FIG. 3, a plurality of air atomization nozzles 3 are arranged in a dot matrix, and the spray pattern when all the air atomization nozzles 3 are in the discharge state is square. The multi-nozzle unit 4 is provided. The multi-nozzle unit 4 in the present embodiment includes a total of 64 air atomization nozzles 3 in 8 rows in the X-axis direction and 8 rows in the Y-axis direction.

(1) First method As shown in FIG. 8, in this method, before the coating direction is changed, a total of 16 air atomizing nozzles, 2 rows at the right end in the X-axis direction and 8 rows (all rows) in the Y-axis direction, are used. 3 is controlled to be in the discharge state. After the coating is changed, a total of 16 air atomization nozzles 3 in 8 rows (all rows) in the X-axis direction and 2 rows at the upper end in the Y-axis direction are controlled to be in the discharge state.

Specifically, first, as shown in FIG. 8, the coating machine is moved in the X-axis direction with respect to the object to be coated 7 to perform coating. At this time, a total of 16 air atomization nozzles 3 in the rightmost two rows in the X-axis direction and eight rows (all rows) in the Y-axis direction are controlled to be in the discharge state.

As the air atomizing nozzle 3 at the right end in the X-axis direction of the multi-nozzle portion 4 of the coating machine approaches the right end of the coating direction change position P (the position surrounded by the square by the dotted line in FIG. 8), the air in the discharge state is discharged. The air atomizing nozzles 3 are switched to the non-discharging state so that the number of the atomizing nozzles 3 gradually decreases. That is, as shown in FIG. 8A, as the coating machine moves, the air atomizing nozzle 3 in the discharging state is gradually switched to the non-discharging state from the lower row in the Y-axis direction. Is controlled by.

As shown in FIG. 8B, when the air atomizing nozzle 3 at the right end in the X-axis direction in the multi-nozzle portion 4 of the coating machine reaches the right end of the coating direction change position P in the object to be coated 7, the coating direction changes. It is changed downward at a predetermined angle (90 degrees in this method). At this time, the coating machine moves in the Y-axis direction without changing the angle of the coating machine itself. The air atomization nozzle 3 is such that the number of air atomization nozzles 3 in the discharge state gradually increases as the air atomization nozzle 3 at the upper end in the Y-axis direction of the coating machine moves away from the upper end of the coating direction change position P. Is switched to the discharge state. That is, as shown in FIGS. 8C and 8D, as the coating machine moves, the air atomization nozzles 3 in the upper two rows in the Y-axis direction in the non-ejection state gradually move from the rightmost row in the X-axis direction. When the air atomization nozzle 3 at the upper end in the Y-axis direction of the coating machine reaches the lower end of the coating direction change position P, 8 rows (all rows) in the X-axis direction are controlled so as to be switched to the discharge state. All 16 air atomization nozzles 3 in the upper two rows in the Y-axis direction are in the discharge state.

(2) Second Method The second method will be described below. In the coating machine used in this method, as in the first method, a plurality of air atomizing nozzles 3 are arranged in a dot matrix, and the spray pattern when all the air atomizing nozzles 3 are in the ejection state is A multi-nozzle portion 4 having a square shape is provided. In this method, only the points different from the first method will be described.

First, as shown in FIG. 9, the coating machine is moved in the X-axis direction with respect to the object to be coated to perform coating. At this time, a total of 16 air atomization nozzles 3 in the right end 2 rows in the X-axis direction and 8 rows (all rows) in the Y-axis direction of the multi-nozzle portion 4 of the coating machine are controlled to be in the discharge state. ..

When the air atomizing nozzle 3 at the right end in the X-axis direction of the multi-nozzle portion 4 of the coating machine reaches the right end of the coating direction change position P on the object to be coated, all of the plurality of air atomizing nozzles 3 are switched to the non-ejection state. Be done. Then, the painting direction is changed downward at an angle of 90 degrees.

At this time, the coating machine moves in the Y-axis direction without changing the angle of the coating machine itself. Then, when the row of the air atomizing nozzles 3 at the upper end in the Y-axis direction in the multi-nozzle portion 4 of the coating machine reaches the lower end of the coating direction change position P, eight rows (all rows) in the X-axis direction and the Y-axis direction All 16 air atomization nozzles 3 in the upper two rows in the above are switched and controlled so as to be in the discharge state, and painting in the Y-axis direction is performed.

(3) Third Method The third method will be described below. In the coating machine used in this method, as in the first method and the second method, when a plurality of air atomization nozzles 3 are arranged in a dot matrix and all the air atomization nozzles 3 are in a discharge state. The multi-nozzle portion 4 having a square spray pattern is provided. It should be noted that this method also describes only the differences from the first method.

First, as shown in FIG. 10, the coating machine is moved in the X-axis direction with respect to the object to be coated to perform coating. At this time, a total of 16 air atomization nozzles 3 in the right end 2 rows in the X-axis direction and 8 rows (all rows) in the Y-axis direction of the multi-nozzle portion 4 of the coating machine are controlled to be in the discharge state. ..

When the air atomization nozzle 3 at the right end in the X-axis direction in the multi-nozzle portion 4 of the coating machine reaches the left end of the coating direction change position P in the object to be coated, the air atomization nozzle 3 at the lower end in the Y-axis direction is in a non-ejection state. It is switched, and a total of 14 air atomization nozzles 3 in the rightmost two rows in the X-axis direction and seven rows in the Y-axis direction are in the discharge state. Then, when the air atomizing nozzle 3 at the right end in the X-axis direction in the multi-nozzle portion 4 of the coating machine reaches the right end of the coating direction change position P, all of the plurality of air atomizing nozzles 3 are switched to the non-ejection state. Then, the painting direction is changed downward at an angle of 90 degrees.

At this time, the coating machine moves in the Y-axis direction without changing the angle of the coating machine itself. Then, when the row of the air atomizing nozzles 3 at the upper end of the multi-nozzle portion 4 of the coating machine in the Y-axis direction reaches the lowest stage of the coating direction change position P, eight rows of the multi-nozzle portion 4 in the X-axis direction (all). All 16 air atomization nozzles 3 in the row) and the upper two rows in the Y-axis direction are switched and controlled so as to be in the discharge state, and painting in the Y-axis direction is performed.

In any of the above-mentioned first to third methods, when the painting direction is changed during painting, the painting can be smoothly performed without changing the angle of the painting machine itself at the painting direction change position P. ..

(Other embodiments)
In the above-mentioned coating direction change coating, an example of using a coating machine having a multi-nozzle portion in which the spray pattern is square when all the air atomization nozzles are in the ejection state is shown, but the configuration is limited to this configuration. is not. Certainly, when a coating change angle of 90 degrees is required, a coating machine equipped with a multi-nozzle portion having a square spray pattern is suitable, but for example, a coating change angle of 60 degrees is required. In this case, it is desirable to use a coating machine equipped with a multi-nozzle portion having a regular hexagonal spray pattern.

Although the present invention has been described with reference to the drawings as described above, the present invention is not limited to the configuration of the drawings. In addition, it goes without saying that it can be carried out in various aspects without departing from the gist of the present invention.

The coating machine and coating system of the present invention can be particularly suitably used in the technical field of painting the entire body of, for example, an automobile, a railroad vehicle, or an aircraft.

1 Painting system 2 Painting machine 3 Air atomization nozzle 4 Multi-nozzle part (nozzle group)
5 Controller (control unit)
6 Robot arm (support means)
7 Object to be coated 8 Coating film S Spray pattern P Coating direction change position L Length of 1 / (number of recoating) of spray pattern size N Outline of coating range

Claims (6)

A group of nozzles consisting of multiple air atomization nozzles that discharge paint,
A control unit for switching between the discharge state and the non-discharge state of each of the plurality of air atomization nozzles is provided.
A coating machine in which the plurality of air atomization nozzles are arranged on a flat surface or a curved surface , and each of the plurality of air atomization nozzles has one discharge port . The coating machine according to claim 1, wherein the plurality of air atomization nozzles are arranged so that the spray pattern when all of them are in the discharge state is a regular polygonal shape, a rectangular shape, a parallel quadrilateral shape, or a circular shape. The coating machine according to claim 1 or 2, wherein the coating discharge amount of each of the plurality of air atomization nozzles is 15 cc / min or less. The coating machine according to any one of claims 1 to 3 and
A support means for supporting and moving the nozzle group, and
A paint supply means for supplying paint to the nozzle group and
A coating system including an air supply means for supplying air to the nozzle group. As the coating machine approaches the coating direction change position, the air atomizing nozzles are switched to the non-ejection state so that the number of the air atomizing nozzles in the discharging state gradually decreases.
As the coating machine reaches the coating direction change position, the coating direction is changed by a predetermined angle, and the coating machine moves away from the coating direction change position, the number of the air atomizing nozzles in the discharging state gradually increases. The coating system according to claim 4, wherein the air atomization nozzle is controlled by the control unit so that the air atomization nozzle is switched to a discharge state so as to increase the number of nozzles. In the coating machine according to any one of claims 1 to 3,
A coating machine control method for controlling the flow rate of paint to be supplied to the nozzle group according to the number of the air atomizing nozzles in the ejection state by setting the paint ejection amount per the air atomizing nozzle.

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