JP2007029791A - Air atomization gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air atomizing gun which is capable of reducing the time loss due to posture alteration of a gun. <P>SOLUTION: The air atomizing gun 1 is provided with a coating discharge port 11 which is opened at the end of a coating nozzle 10, an air hole 21 for atomization to jet compressed air for coating atomization, which is installed at the perimeter of the coating discharge port 11 and air holes 31, 41 for pattern formation to jet compressed air for pattern formation, which are installed to opposite so that they make a pair at the outside of the air hole 21 for atomization centered on the coating discharge port 11. Two pairs or more of the air holes 31, 41 are provided in opposite along different directions centered on the coating discharge port 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention forms a predetermined pattern by spraying compressed air from the atomizing air holes to atomize the paint discharged from the paint discharge port, and further blowing compressed air from the pattern forming air holes. Regarding air atomization gun.

  A paint discharge port that opens at the tip of the paint nozzle, an atomizing air hole that is provided around the paint discharge port and blows compressed air for paint atomization, and outside the atomizing air hole and the paint 2. Description of the Related Art Conventionally, there is known an air atomizing gun provided with a pattern forming air hole that is provided so as to be paired with a discharge port as a center and blows compressed air for pattern formation.

  In such an air atomizing gun, since the pattern formation direction is limited to one direction, for example, when the surface to be coated changes rapidly, it is necessary to change the direction of the gun in accordance with the change. In the painting process using a robot, in order to change the direction of the gun, it is necessary to temporarily stop painting and change the posture of the robot significantly, which causes a large time loss.

An object of this invention is to provide the air atomization gun which can reduce the time loss accompanying the attitude | position change of a gun.
In order to achieve the above object, according to the present invention, a paint discharge port that opens at the tip of a paint nozzle, and an atomizing air that is provided around the paint discharge port and blows out compressed air for paint atomization. A pattern forming air hole that is provided to face the outside of the atomizing air hole and to be paired with the paint discharge port as a center, and blows compressed air for pattern formation. There is provided an air atomizing gun including two or more pairs of pattern forming air holes facing each other in different directions with the paint discharge port as a center.

  In the present invention, two or more pairs of pattern forming air holes are provided outside the atomizing air holes so as to face each other in different directions with the paint discharge port as the center. Thereby, for example, when the surface to be coated changes suddenly, the air holes for blowing the compressed air for pattern formation are switched from the pair of pattern formation air holes to another pair of pattern formation air holes. Without changing the position of the gun or robot, the paint pattern direction can be changed instantaneously while continuing painting. As a result, the time loss associated with the robot posture change is reduced, so that the cycle time can be shortened and the number of guns and robots can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a plan view showing an air atomizing gun according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG. It is.

  As shown in FIGS. 1 to 3, the air atomizing gun 1 according to the embodiment of the present invention is provided, for example, at the center of the tip of a gun body (not shown) attached to the tip of an arm of a painting robot. A paint nozzle 10 and an air cap 20 that is also provided at the tip of the gun body are provided.

  The paint nozzle 10 is a tubular member in which a paint passage 12 through which paint can flow is formed. The paint nozzle 10 has a tapered shape that becomes narrower toward the tip, and is opened by a paint discharge port 11 provided at the tip. The paint supplied from the rear end side of the paint nozzle 10 passes through the paint passage 12 and is discharged to the outside from the paint discharge port 11.

  A circular central hole is formed in the center of the tip of the air cap 20, and a tapered internal space corresponding to the tip of the paint nozzle 10 is formed in the center along the axis. And the coating material nozzle 10 is arrange | positioned in the internal space of the air cap 20 so that the coating material discharge port 11 may face through a center hole, The internal peripheral surface of the internal space of the air cap 20, and the outer peripheral surface of the coating material nozzle 10 An air passage 22 through which compressed air can flow is formed. The compressed air supplied from the rear end side of the air cap 20 passes through the air passage 22 and is atomized between the tip outer peripheral surface of the paint nozzle 10 and the inner peripheral surface of the central hole of the air cap 20. The air is blown to the outside through the air hole 21. The blown compressed air atomizes the paint discharged from the paint discharge port 11 into fine particles.

  A pair of first protrusions 30 and a pair of second protrusions 40 that protrude along the paint discharge direction α are formed on the outer periphery of the air cap 20.

As shown in FIGS. 1 and 2, the pair of first protrusions 30 are disposed so as to face each other along the Y direction in FIG. 1 with the paint discharge port 11 as the center. An air passage 32 communicating with an air supply source (not shown) is formed in the first protrusion 30 along the axial direction. As shown in FIG. 2, the air passage 32 opens to the outside by a first pattern forming air hole 31 that forms an inclination angle (discharge angle) θ ₁ with respect to the paint discharge direction α. The height of the first pattern forming air hole 31 from the paint discharge port 21 along the paint discharge direction α is h ₁ . The pattern formation air ejected from the first pattern formation air holes 31 comes into contact with the sprayed paint at the first pattern formation start position F1 (see FIGS. 4A and 4B), and the first pattern Start formation of P1.

On the other hand, as shown in FIGS. 1 and 3, the pair of second protrusions 40 are disposed so as to face each other along the X direction in FIG. 1 with the paint discharge port 11 as the center. An air passage 42 communicating with an air supply source (not shown) is also formed in the second protrusion 40 along the axial direction. As shown in FIG. 3, the air passage 42 is opened to the outside by a second pattern forming air hole 41 having an inclination angle θ ₂ with respect to the paint discharge direction α. The inclination angle θ ₁ of the first pattern forming air hole 31 is relatively smaller than the inclination angle θ _{2 of} the second pattern forming air hole 41 (θ ₁ <θ ₂ ). Further, the second pattern formation air hole 41 has a height along the coating material delivery port 11 to the coating material delivery direction α is in the h _2. The height h ₁ of the first pattern forming air hole 31 is relatively lower than the height h _{2 of} the second pattern forming air hole 41 (h ₁ <h ₂ ). The pattern forming air ejected from the second pattern forming air holes 41 comes into contact with the sprayed paint at the second pattern formation start position F2 (see FIGS. 5A and 5B), and reaches the second pattern. Begin formation of P2.

In the present embodiment, the inclination angle θ ₁ and the height h ₁ of the first pattern formation air hole 31 are defined as described above, and the first pattern formation start position F 1 is set as the second pattern formation air. with higher along the height h ₂ from the coating material delivery direction α of the hole 41, and away along the coating material delivery port 11 to the coating material delivery direction α than the second pattern formation start position F2. As described above, by appropriately setting the inclination angles θ ₁ and θ ₂ and the heights h ₁ and h ₂ of the pattern forming air holes 31 and 41, one of the pattern forming air holes 31 or 41 is used. Sometimes, it is possible to prevent the paint from adhering to the other unused pattern forming air hole 41 or 31, and to prevent the occurrence of problems due to scattered dirt.

  Below, operation | movement of the air atomization gun 1 which concerns on this embodiment is demonstrated.

  4A is a cross-sectional view of the air atomizing gun forming the first pattern, taken along line II-II in FIG. 1, and FIG. 4B is the air atomizing gun forming the first pattern in FIG. FIG. 5A is a cross-sectional view taken along the line II-II of FIG. 1 of the air atomizing gun forming the second pattern, and FIG. 5B is a cross-sectional view taken along the line III-III. FIG. 6 is a plan view showing first and second patterns formed by the air atomizing gun according to the embodiment of the present invention. is there.

  First, to form the first pattern (the first pattern P1 shown in FIG. 6), compressed air is supplied to the air passage 22 of the air cap 20 and the atomization provided around the paint discharge port 11 is performed. The atomizing air is ejected from the air hole 21 and the paint supplied to the paint passage 12 of the paint nozzle 10 is discharged from the paint discharge port 11 to spray the paint along the paint discharge direction α. At the same time, compressed air is supplied to the air passages 32 formed inside the pair of first protrusions 30, and the pattern forming air is ejected from the first pattern forming air holes 31. By this ejection, an elliptical pattern composed of a major axis along the X-axis direction and a minor axis along the Y-axis direction is formed as in the first pattern P1 shown in FIG.

  Next, when it is necessary to rotate the pattern shape due to, for example, a sudden change in the surface to be coated, the supply of compressed air to the first pattern forming air holes 31 is stopped by switching a valve (not shown) or the like. At the same time, compressed air is supplied to the air passages 42 formed inside the pair of second protrusions 40, respectively, and the pattern forming air is ejected from the second pattern forming air holes 41. By this ejection, an elliptical pattern composed of a short axis along the X-axis direction and a long axis along the Y-axis direction is formed as in the second pattern P2 shown in FIG.

  In this way, by changing the air hole for ejecting the compressed air for pattern formation from the first pattern formation air hole 31 to the second pattern formation air hole 41, the posture of the gun or robot is not changed. In addition, the direction of the paint pattern can be changed instantaneously while continuing the painting. As a result, the time loss associated with the robot posture change is reduced, so that the cycle time can be shortened and the number of guns and robots can be reduced.

  The embodiment described above is described in order to facilitate understanding of the present invention, and is not described in order to limit the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention. For example, in the above-described embodiment, two pairs of pattern forming air holes have been described. However, the present invention is not particularly limited to this, and three or more pairs of pattern forming air holes may be provided.

FIG. 1 is a plan view showing an air atomizing gun according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4A is a cross-sectional view of the air atomizing gun forming the first pattern, taken along line II-II in FIG. 4B is a cross-sectional view of the air atomizing gun forming the first pattern, taken along line III-III in FIG. 5A is a cross-sectional view of the air atomizing gun forming the second pattern, taken along line II-II in FIG. 5B is a cross-sectional view of the air atomizing gun forming the second pattern, taken along line III-III in FIG. FIG. 6 is a plan view showing first and second patterns formed by the air atomizing gun according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air atomization type spray gun 10 ... Paint nozzle 11 ... Paint discharge port 12 ... Paint passage 20 ... Air cap 21 ... Air hole for atomization 22 ... Air passage 30 ... 1st projection part 31 ... 1st pattern formation Air hole 32 ... Air passage 40 ... Second protrusion 41 ... Second pattern forming air hole 42 ... Air passage h ₁ ... Height of first pattern forming air hole h ₂ ... Second pattern formation The height α of the air hole for the coating material The discharge direction of the paint θ ₁ The inclination angle of the first pattern forming air hole with respect to the discharging direction θ ₂ The inclination angle of the second air hole for forming the pattern with respect to the discharging direction

Claims (4)

A paint outlet opening at the tip of the paint nozzle;
An atomizing air hole that is provided around the paint discharge port and blows compressed air for paint atomization;
An air atomization comprising: a pattern forming air hole that is provided outside the atomizing air hole and opposed to form a pair with the paint discharge port as a center, and jets compressed air for pattern formation Cancer,
An air atomizing gun comprising two or more pairs of pattern forming air holes facing each other along different directions around the paint discharge port. The air hole for pattern formation is
A pair of first pattern forming air holes facing each other along a predetermined direction around the paint discharge port;
2. The air atomizing gun according to claim 1, further comprising a pair of second pattern forming air holes facing each other along a direction different from the predetermined direction around the paint discharge port. The height along the paint discharge direction of the first pattern forming air hole is different from the height along the paint discharge direction of the second pattern forming air hole,
The air atomizing gun according to claim 2, wherein an inclination angle of the first pattern forming air hole with respect to the paint discharge direction is different from an inclination angle of the second pattern forming air hole with respect to the paint discharge direction. The height of the first pattern forming air holes along the paint discharge direction is relatively low with respect to the height of the second pattern forming air holes along the paint discharge direction, and
4. The air according to claim 3, wherein an inclination angle of the first pattern forming air hole with respect to the paint discharge direction is relatively small with respect to an inclination angle of the second pattern forming air hole with respect to the paint discharge direction. Atomization gun.

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