JP4823709B2 - Painting equipment - Google Patents

Description

  The present invention relates to a coating apparatus that discharges paints from a plurality of atomizing mechanisms toward an object to be coated simultaneously in a flat spray pattern to form a single coating pattern.

For example, an air atomizing coating machine atomizes a coating material with atomizing air, and then makes the coating pattern circular or elliptical with pattern air and ejects the coating pattern in the direction of an object to be coated.
If the object to be coated is a resin product using this coating machine, it is preferable to carry out electrostatic air atomization to improve the coating efficiency. It is necessary to apply a primer coating.
However, since the primer paint is expensive, a non-electrostatic air atomization coating must be applied to an object to which the coating cost cannot be applied even if the coating efficiency is somewhat low.

In this case, if the coating efficiency is to be maintained at about 50%, the coating efficiency must be considerably inferior to that of electrostatic coating because the coating must be performed at a low discharge rate of about 100 cc / min.
Here, if it is used at a high discharge rate of 200 cc / min or more, it will adversely affect the atomization of the paint and not only will cause poor paint, but also the paint efficiency will be lowered to 20-30%, resulting in a lot of waste of paint. There is a problem that the production efficiency cannot be improved.

If the coating pattern of the air atomizing coating machine is made oval, the coating width is narrowed, and the distance between the object to be coated and the coating machine is reduced, the coating efficiency can be improved, but the unit time The paint area per hit will be narrow.
For this reason, a coating apparatus has been proposed in which a plurality of air atomizing coating machines are arranged in a robot to increase the coating area.
JP 11-309393 A

In this case, as shown in FIG. 4, the flat spray pattern 23 is formed by overlapping the oval spray patterns 22A and 22B of the respective coating machines 21A and 21B by shifting the radius in the major axis direction, and coating is performed in the forward path and the return path. While shifting so that both sides of the pattern overlap, they are moved in the minor axis direction and painted.
For this reason, it is suitable for painting on a planar object that can be painted only by simple reciprocation, but if the object has a three-dimensional and complicated shape, depending on the shape Since it is necessary to paint while changing the painting direction with a painting robot, it is difficult to paint with the simple flat painting pattern 23, and it is desirable to paint with a circular or annular painting pattern.

  Therefore, the present invention can be applied with a uniform coating pattern even when coating using a method in which the coating efficiency decreases if the discharge amount is increased, such as air atomization coating, while maintaining the coating efficiency, The problem is to increase the discharge amount and improve the production efficiency.

In order to solve this problem, the present invention relates to a coating apparatus that simultaneously discharges paint in a flat spray pattern from a plurality of atomizing mechanisms toward an object to be coated, and forms a single coating pattern. Each atomizing mechanism is attached to a rotating base that is rotationally driven at a predetermined number of revolutions, and for at least one atomizing mechanism, the major axis direction of the flat spray pattern is the center of the coating pattern formed by the rotation of the rotating base. The discharge direction is set so as to extend along the radial direction from the outer edge to the outer edge, and an arbitrary atomization mechanism among the atomization mechanisms is tilted with respect to the rotation base so that the flat spray pattern is moved from the center of the coating pattern. It is characterized by having a coating pattern diameter adjusting mechanism that expands and contracts the coating pattern by being closely spaced .

According to the present invention, since each atomizing mechanism attached to the rotating base rotates by rotating the rotating base, each flat spray pattern discharged from the atomizing mechanism toward the object to be coated has its rotation axis. Since at least one or more of the flat spray patterns are arranged along the radial direction from the center of the coating pattern formed by the rotation of the rotation base toward the outer edge. A circular or annular coating pattern is reliably formed.
Accordingly, when the object to be coated has a three-dimensional and complicated shape, uniform coating can be performed even if the coating robot changes the coating direction according to the shape.
In addition, since a substantially uniform circular or annular coating pattern can be formed using a plurality of atomizing mechanisms, a method in which the coating efficiency is reduced by increasing the discharge amount as in air atomizing coating is used. Even when painting, the amount of atomization mechanism can be increased, so the discharge rate can be increased without reducing the coating efficiency, so that production efficiency can be improved while maintaining the coating efficiency. Has an excellent effect.

This and can, since each of the atomizing mechanism to adjust the ejection direction by tilting relative to the base, is arranged to be movable flat spray pattern in the radial direction of the circular coating pattern, thereby scaling the circular coating pattern Can do.
In addition, the discharge direction of each atomizing mechanism may be set so that each flat spray pattern is arranged without a gap along the radial direction from the center of the coating pattern formed when the rotating base rotates to the outer edge. For example, when the rotating base is rotated, a more uniform circular coating pattern without a gap is formed.

  In this example, even when painting using a method that reduces the coating efficiency if the discharge rate is increased, such as air atomization coating, it can be painted with a circular or annular coating pattern, while maintaining the coating efficiency, In order to achieve the problem of increasing the discharge amount and improving the production efficiency, a plurality of atomizing mechanisms having a flat spray pattern are attached to a rotation base that is rotationally driven at a predetermined rotational speed, and at least one atomizing mechanism The discharge direction was set so that the major axis direction of the flat spray pattern was along the radial direction from the center of the coating pattern formed by the rotation of the rotary base toward the outer edge.

  FIG. 1 is an explanatory view showing an example of a coating apparatus according to the present invention, FIG. 2 is a sectional view thereof, and FIG.

The coating apparatus 1 of this example simultaneously discharges paints from a plurality of air atomization nozzles (atomization mechanisms) N _{1 to} N ₃ toward an object to be coated in a flat spray pattern F _{1 to} F ₃ to form a single coating. A pattern P is formed and painted.
Each of the air atomizing nozzles N _{1 to} N ₃ is attached to a rotation base 4 that is driven to rotate at a predetermined number of rotations by an air motor 3 built in the coating machine body 2.
The air atomization nozzle N ₁ is arranged such that the flat spray pattern F ₁ is arranged along the radial direction in which the major axis direction L is directed from the center of the coating pattern P formed by the rotation of the rotary base 4 toward the outer edge. The discharge direction is set.

The coating machine main body 2, the paint supplied to each air atomizing nozzles N ₁ to N _3, atomizing air, pattern air, and the inflow port 6A~6D nozzle tilting air is formed, respectively are flow path The grooves 8 </ b> A to 8 </ b> D communicated on the outer peripheral surface of the rotating shaft 5 of the air motor 3 are communicated with each other via 7 </ b> A to 7 </ b> D.
The fluids supplied to the concave grooves 8A to 8D are supplied to the rotary base 4 through the flow paths 9A to 9D formed in the rotary shaft 5 and via the branch flow paths 10A to 10D formed in the rotary base 4. The air atomization nozzles N _{1 to} N ₃ are supplied.

The air atomization nozzles N _{1 to} N ₃ are arranged to be tiltable so that the discharge direction can be adjusted to the radial direction of the coating pattern P by the support shafts S _{1 to} S _3. It is formed through the support shafts S _{1 to} S ₃ .
In addition, each air atomizing nozzles N ₁ to N _3, by moving the flat spray pattern F ₁ to F ₃ each in the radial direction of the coating pattern P, with patterns diameter adjusting mechanism 11 for scaling the coating pattern P ing.

The pattern diameter adjusting mechanism 11 is formed by an air cylinder 12 disposed on the upper end side of each of the nozzles N _{1 to} N ₃ , and the piston 13 contracts when nozzle tilting air having a predetermined pressure is supplied to the air cylinder 12. Then, the flat spray patterns F _{1 to} F ₃ are moved outward along the radial direction of the coating pattern P by the elastic force of the springs (not shown) built in the support shafts S _{1 to} S _3. It can be made to.
When the supply of nozzle tilting air is stopped, the piston 13 is extended, and the flat spray patterns F _{1 to} F ₃ are moved along the radial direction of the coating pattern P against the resilience of a spring (not shown). Can be moved to the center.

In this example, the nozzle _{N 1} is fixed, by tilting the other two nozzles _{N 2} and _{N 3,} FIGS. 3 (a) flat spray pattern as shown in ~ (c) _{F 2} and _{F 3} Is moved closer to and away from the center of the coating pattern so that the diameter of the coating pattern P can be expanded or reduced.
As shown in FIGS. 3A to 3C, in this example, the flat spray patterns F ₂ and F ₃ gradually move outward as the coating pattern P expands, but the flat spray pattern F ₁ is Since it moves toward the outside (FIGS. 3A to 3B) and does not move any further even if the pattern diameter is further increased (FIGS. 3B to 3C), in such a case either the air supply system for the nozzle tilt two systems provided may be set to weaken the spring strength is built into the cylinder 12 of the nozzle N _1.

The above is an example configuration of the present invention, and its operation will be described next.
First, in a state where the nozzle tilting air is not supplied, as shown in FIG. 3A, the flat spray patterns F ₂ and F ₃ are arranged substantially in parallel so as to be close to the flat spray pattern F ₁ and arranged on both sides thereof. Has been.
In this state, when the paint, atomization air, and pattern air are supplied while the air motor 3 is rotated and the paint is sprayed from each of the air atomization nozzles N _{1 to} N ₃ , the length is shorter than the major axis of the flat spray pattern F _1. the the minimum coating pattern P ₁ round whose radius is formed of, is suitable for the case the article to be coated is small.
In this case, since the flat spray patterns F _{1 to} F ₃ are arranged substantially in parallel, the shaping air of each of the flat spray patterns F _{1 to} F ₃ is unlikely to interfere with each other and the coating pattern P ₁ is not easily disturbed.

Next, when the coating pattern P is enlarged, as shown in FIG. 3B, the pressure of the nozzle tilting air is adjusted to incline the air atomizing nozzles N _{1 to} N ₃ to the outside, thereby generating a flat spray pattern. When F _{1 to} F ₃ are separated from the center of the coating pattern P, one end of the flat spray pattern F ₁ is positioned at the approximate center of the coating pattern P, and the outer ends of the other flat spray patterns F ₂ and F ₃ It is positioned to be inscribed in the coating pattern P ₂ which is formed by rotating a flat spray pattern F _1.
In this state, when the air motor 3 is rotated and the paint, atomizing air, and pattern air are supplied and the paint is sprayed from the air atomizing nozzles N _{1 to} N ₃ , the major axis of the flat spray pattern F ₁ is set as the radius. since uniform coating pattern P ₂ of a circular to is formed, it can cope with the case to be slightly wider coating width.

Further, when larger than the coating pattern, as shown in FIG. 3 (c), by adjusting the pressure of the nozzle tilt air tilted further outside the respective air atomizing nozzles N ₂ and N _3, the flat spray pattern F ₂ and F ₃ are further separated from the center of the coating pattern P.
In this state, while the air motor 3 is rotated, coating material, atomizing air, and pattern air are supplied, and when the coating material is sprayed from each of the air atomizing nozzles N _{1 to} N ₃ , the coating pattern P ₃ is applied with the flat spray pattern F _1. central portion of the (portion corresponding to the coating pattern P ₂₎ is coated, the outside is coated with flat spray pattern F ₂ and F _3.
Thus, the radius of the coating pattern _{P 3} is longer than the major axis of the flat spray pattern _F 1 to F _3.
At this time, the flat spray patterns F _{1 to} F ₃ are arranged without gaps along the radial direction of the coating pattern P ₃ , so that the coating pattern P ₃ formed by rotating the rotating base 4 is It becomes a circle with no gap.

Furthermore, in any case, since it is overcoated with the respective flat spray patterns F _{1 to} F ₃ sprayed from the three nozzles N _{1 to} N ₃ , compared with the case where the same coating area is applied with one unit. A coating film that is three times as thick as the same coating time can be formed, and is suitable for thick coating.

In the above description, the flat spray patterns F _{1 to} F ₃ are arranged without gaps in the radial direction of the coating pattern P to form a circular coating pattern. However, each flat spray pattern is formed as necessary. F _{1 to} F ₃ may be brought outside the coating pattern P to form an annular coating pattern P.
Further, the arrangement of the flat spray patterns F _{1 to} F ₃ is arbitrary. For example, as shown in FIGS. 3 (d) and 3 (e), the major axis direction of each of the patterns F _{1 to} F ₃ is the radius of the coating pattern P. It may be arranged along the direction.

  As described above, in the present invention, when coating is performed using a method in which the coating efficiency decreases if the discharge amount is increased as in air atomization coating, the discharge amount is reduced by a circular or annular coating pattern. It is possible to increase the thickness and to apply for thick coating with high coating efficiency.

Explanatory drawing which shows an example of the coating device which concerns on this invention. FIG. Explanatory drawing which shows the relationship between a coating pattern and a flat spray pattern. Explanatory drawing which shows a conventional apparatus.

Explanation of symbols

1 coating device N _{1 to} N ₃ air atomizing nozzle (atomizing mechanism)
F _{1 to} F ₃ Flat spray pattern 4 Rotating base L Major axis direction L
P Paint pattern P
S ₁ to S ₃ spindle 11 pattern size adjustment mechanism

Claims (2)

In a coating device that paints from a plurality of atomizing mechanisms simultaneously to the object to be coated in a flat spray pattern to form a single coating pattern,
Each of the atomizing mechanisms is attached to a rotary base that is rotationally driven at a predetermined rotational speed, and the major axis direction of the flat spray pattern of at least one atomizing mechanism is a coating pattern formed by rotation of the rotary base. The discharge direction is set along the radial direction from the center toward the outer edge ,
A coating pattern diameter adjusting mechanism that expands or contracts the coating pattern by tilting an arbitrary atomizing mechanism among the atomizing mechanisms with respect to the rotation base and moving the flat spray pattern close to and away from the center of the coating pattern is provided . A painting device characterized by that.   The coating apparatus according to claim 1, wherein a discharge direction of each atomizing mechanism is set such that each flat spray pattern is arranged without a gap along a radial direction from the center of the coating pattern toward the outer edge.

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