JP2014079714A - Coating gun and coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating gun which can obtain a plurality of coating patterns with excellent shapes.SOLUTION: In figure (a), a first coating material 56 is supplied from an aperture 52, flows out to a front face from a second shaping air blowout hole 32 which also serves as a first coating material outflow hole, is discharged from an outer edge of a first surface 33, and is shaped by shaping air from a first shaping air blowout hole 18. As shown in figure (b), pressurized air is supplied behind a second rotary atomizing head 40 from an aperture 54, and blown out to the front face from the second shaping air blowout hole 32 which also serves as the first coating material outflow hole. A second coating material 57 is supplied form a third tube 55, flows out to the front face from a second coating material outflow hole 41, and is discharged from an outer edge of a second surface 42. The discharged coating material is shaped by shaping air from the second shaping air blowout hole 32 which also serves as the first coating material outflow hole. Thus, coating patterns A and B are obtained having excellent shapes.

Description

  The present invention relates to a coating gun including a plurality of rotary atomizing heads and a coating technique.

  Paint guns that spray paint with a rotary atomizing head are widely used in practice. By controlling the rotation speed, it is possible to change the coating pattern to some extent, but there is a limit. Accordingly, various coating guns having a plurality of rotary atomizing heads have been proposed (see, for example, Patent Document 1 (FIG. 1)).

  As shown in FIG. 1 of Patent Document 1, the coating gun (100) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter) is used for the small diameter bell cup 1 (2A) and the large diameter. The bell cup 2 (2B) is provided, so that a wide range of coating patterns can be obtained.

Paint is supplied to the small-diameter bell cup 1 (2A) through a feed tube 1 (31) provided at the center of rotation. The supplied paint is subjected to centrifugal force and spread evenly by the bell cup 1 (2A).
On the other hand, since the paint is supplied to the large-diameter bell cup 2 (2B) through the feed tube 2 (3) that is far away from the center of rotation, the paint may be spread unevenly. If it is biased, the coating film becomes non-uniform and problems such as uneven color occur.

Various techniques that can solve the problems of Patent Document 1 are also proposed (see, for example, Patent Document 2 (FIG. 1)).
As shown in FIG. 1 of Patent Document 2, the large-diameter bell portion (20) is supplied with paint from the first paint supply pipe (24) disposed in the vicinity of the rotation center, and the small-diameter bell portion (21 ) Is supplied with the paint from the second paint supply pipe (25) disposed in the vicinity of the rotation center, so that the paint is evenly spread.

After being spread, the shape of the paint is adjusted with the shaping air from the shaping air ejection holes (air outlets) (32a, 33a).
However, the outer edge of the small diameter bell portion (21) is remarkably separated from the shaping air ejection holes (air outlets) (32a, 33a). As a result, the shaping air does not act on the paint released from the small-diameter bell portion (21).

Then, although the shape of the large-diameter coating pattern is well adjusted, it is expected that the shape of the small-diameter coating pattern will collapse, and the range of the coating pattern is limited.
In this case, the meaning of attaching the bell portion (21) to the bell portion (20) becomes thin, and the effect obtained for increasing the equipment cost is small, which is not preferable.

  In a coating gun having a plurality of bell portions (rotating atomizing heads), it is required that a plurality of coating patterns having good shapes can be obtained.

JP 2002-143727 A JP 2001-314784 A

  An object of the present invention is to provide an application gun capable of obtaining a plurality of application patterns having good shapes.

The invention according to claim 1 is a paint gun comprising a plurality of rotary atomizing heads that atomize and release paint supplied from a paint supply path by centrifugal force.
The first rotary atomizing head has a first paint outflow hole that allows the paint supplied to the back surface to flow out to the front surface, and a first creeping surface that imparts centrifugal force to the paint flowing out from the first paint outflow hole,
A first shaping air ejection hole for injecting shaping air for adjusting the shape of the paint discharged from the first creepage surface is provided so as to surround the first rotary atomizing head;
The second rotary atomizing head has an outer edge positioned in front of the first paint outflow hole, and is fixed to the first rotary atomizing head, and a second paint outflow hole through which the paint supplied to the back surface flows out to the front surface. And a coating gun having at least two rotary atomizing heads having different outer diameters, such as a second creeping surface that imparts centrifugal force to the paint flowing out from the second paint outflow hole,
The first paint outflow hole is used as both a paint outflow hole and an air ejection hole so as to be used as a second shaping air ejection hole for ejecting shaping air when the paint does not flow out.

In the invention according to claim 2, the paint supply path is arranged with the first pipe, the second pipe arranged with a gap in the first pipe, and the gap inside the second pipe. A multiple tube consisting of a third tube,
The first paint is supplied to the gap between the first pipe and the second pipe, the shaping air is supplied to the gap between the second pipe and the third pipe, and the second paint is supplied to the third pipe. It is characterized by that.

The invention according to claim 3 is a coating method carried out using the paint gun according to claim 1,
The paint is caused to flow out from the first paint outflow hole, a centrifugal force is applied to the paint along the first creeping surface, and the paint discharged from the first creeping surface is shaped by the air ejected from the first shaping air ejection hole. A first application pattern for adjusting
The paint is caused to flow out from the second paint outflow hole, a centrifugal force is applied to the paint along the second creepage surface, and the paint discharged from the second creepage surface is shaped by the shaping air ejected from the first paint outflow hole. A second application pattern for adjusting
It is characterized by selecting and implementing at least two coating patterns comprising:

  The invention according to claim 4 is characterized in that, in the second application pattern, the pattern is controlled by controlling the rotation speed of the rotary atomizing head in addition to the shaping air.

In the invention according to claim 1, the first paint outflow hole serves as both the paint outflow hole and the air ejection hole so as to be used as the second shaping air ejection hole for ejecting the shaping air when the paint does not flow out. .
That is, a large-diameter coating pattern having a good shape is obtained by the first rotary atomizing head and the first shaping air ejection hole. Further, a small-diameter coating pattern having a good shape can be obtained by the second rotary atomizing head and the second shaping air ejection hole that also serves as the first paint outflow hole.
Therefore, according to the present invention, an application gun capable of obtaining a plurality of application patterns having good shapes is provided.

In the invention according to claim 2, the coating material supply path is a multiple pipe in which the first pipe, the second pipe, and the third pipe are arranged concentrically.
Since this multiple tube is arranged at the center of rotation, the paint is spread evenly by centrifugal force.

According to the third aspect of the present invention, a large-diameter coating pattern having a good shape can be obtained by the first rotary atomizing head and the first shaping air ejection hole. Further, a small-diameter coating pattern having a good shape can be obtained by the second rotary atomizing head and the second shaping air ejection hole that also serves as the first paint outflow hole.
Therefore, according to the present invention, there is provided a coating method capable of obtaining a plurality of coating patterns having good shapes.

In the invention according to claim 4, in the second application pattern, the pattern is controlled by controlling the rotational speed of the rotary atomizing head in addition to the shaping air.
Since the 2nd shaping air ejection hole which serves as the 1st paint outflow hole is provided in the rotation atomization head, turning power can be given to shaping air. The turning force to be applied can be changed by changing the rotation speed. When the rotation speed is controlled, the coating pattern can be controlled. As a result, the range of the coating pattern can be expanded.

It is sectional drawing of the coating gun which concerns on this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. It is an action figure of a painting gun. It is the further effect | action figure of a painting gun.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

  As shown in FIG. 1, the coating gun 10 includes a cylindrical gun body 11, a hollow rotating shaft 13 that is rotatably supported by the gun body 11 via bearings 12, 12, and the hollow rotating shaft 13. A rotating means 14 that rotates, a paint supply path 50 that passes through the hollow rotary shaft 13 and is housed in the center of the hollow rotary shaft 13, a first rotary atomizing head 30 that is attached to the tip of the hollow rotary shaft 13, The second rotary atomizing head 40 is attached to the first rotary atomizing head 30 and has a smaller diameter than the first rotary atomizing head 30.

  The rotating means 14 may have any configuration (Japanese Patent Laid-Open No. 2001-137745, paragraph [0012], FIG. 2 and the like). For example, the rotating means 14 is provided on the gun body 11 side, and the motor shaft of the servo motor 15 is provided. The driving gear 16 is provided, and the driven gear 17 is provided on the hollow rotary shaft 13 and meshes with the driving gear 16. The servomotor 15 rotates the hollow rotary shaft 13 at high speed via the drive gear 16 and the driven gear 17 and simultaneously rotates the first rotary atomizing head 30 and the second rotary atomizing head 40.

  In this embodiment, the gun body 11 is hollow, and a first shaping air ejection hole 18 is provided at a tip portion surrounding the first rotary atomizing head 30. Pressurized air is supplied to the hollow portion of the gun body 11 from the outside via the first air supply pipe 19. A first air valve 21 is interposed in the first air supply pipe 19.

  The paint supply path 50 (described in detail in FIG. 2) is a multiple pipe. The first paint supply pipe 22, the second air supply pipe 23, and the second paint supply pipe 24 are connected to the paint supply path 50 from the outside.

  A second air valve 26 is provided in the second air supply pipe 23, a first paint valve 27 is provided in the first paint supply pipe 22, and a second paint valve 28 is provided in the second paint supply pipe 24. The The first air valve 21, the second air valve 26, the first paint valve 27 and the second paint valve 28 are collectively controlled by the control unit 29.

  The first rotary atomizing head 30 is provided at a predetermined radial position from the rotation center 31 and has a first paint outflow hole 32 through which the paint supplied to the back surface flows out to the front surface, and the paint outflowing from the first paint outflow hole 32. And a first creeping surface 33 for applying a centrifugal force to the surface. Since the first paint outflow hole 32 also serves as the second shaping air ejection hole, it is hereinafter referred to as a second shaping air ejection hole 32 that also serves as the first paint outflow hole.

  The second rotating atomizing head 40 has an outer diameter that is approximately twice the predetermined radius R and is fixed to the first rotating atomizing head 30. The second rotary atomizing head 40 has a second paint outflow hole 41 through which the paint supplied to the back surface flows out to the front surface, and a second creeping surface that imparts centrifugal force to the paint flowing out from the second paint outflow hole 41. 42.

  As shown in FIG. 2, the paint supply path 50 includes a first pipe 51 having the largest diameter, a second pipe 53 that is accommodated with a gap 52 in the first pipe 51, and a gap in the second pipe 53. This is a triple pipe composed of a third pipe 55 which is accommodated by placing 54. The first paint supply pipe 22 is connected to the gap 52, the second air supply pipe 23 is connected to the gap 54, and the second paint supply pipe 24 is connected to the third pipe 55.

  As shown in FIG. 1, the third tube 55 is extended to the vicinity of the back surface of the second rotary atomizing head 40. The second pipe 53 and the first pipe 51 are extended to the vicinity of the back surface of the first rotary atomizing head 30.

The operation of the coating gun 10 having the above configuration will be described next.
First, in FIG. 1, the control unit 29 opens the first air valve 21 and the first paint valve 27 and closes the second air valve 26 and the second paint valve 28.

  Then, as shown in FIG. 3A, the first paint 56 is supplied from the gap 52, and the first paint 56 flows out from the second shaping air ejection hole 32 that also serves as the first paint outflow hole to the front surface. The paint that has flowed out is given a centrifugal force on the first creeping surface 33 and discharged from the outer edge. The discharged paint is shaped by the shaping air from the first shaping air ejection hole 18 and travels toward the object to be coated (for example, the vehicle body). Since the first shaping air ejection hole 18 is provided in the vicinity of the outer edge of the first creeping surface 33, the shape of the coating pattern A is improved.

Next, in FIG. 1, the control unit 29 closes the first air valve 21 and the first paint valve 27 and opens the second air valve 26 and the second paint valve 28.
Then, as shown in FIG. 3 (b), the pressurized air is supplied from the gap 54 behind the second rotary atomizing head 40. This air is ejected to the front from the second shaping air ejection hole 32 which also serves as the first paint outflow hole.

Further, the second paint 57 is supplied from the third pipe 55, and the second paint 57 flows out from the second paint outflow hole 41 to the front surface. The paint that has flowed out is given a centrifugal force on the second creeping surface 42 and discharged from the outer edge.
The discharged paint is shaped by the shaping air from the second shaping air ejection hole 32 that also serves as the first paint outflow hole, and travels toward the object to be coated (for example, the vehicle body). Since the second shaping air ejection hole 32 that also serves as the first paint outflow hole is provided in the vicinity of the outer edge of the second creeping surface 42, the shape of the coating pattern B is improved.

  Next, an operation obtained by controlling the rotation speed will be described. The constituent elements in FIGS. 4A and 4B are the same as those in FIG.

  In FIG. 4A, the first and second rotary atomizing heads 30 and 40 are rotated at a speed Va. By this rotation, a coating pattern C is obtained.

Next, as shown in FIG. 4B, the first and second rotary atomizing heads 30 and 40 are rotated at a speed Vb higher than the speed Va. By this rotation, a coating pattern D is obtained. Since the turning force (or centrifugal force) applied to the air is increased, the component force outward in the diameter is increased, and as a result, the coating pattern D has a larger diameter than the coating pattern C shown in FIG.
In this way, various application patterns can be obtained by controlling the rotation speed.

  In addition, in the Example, although the coating gun was equipped with the 1st rotation atomization head and the 2nd rotation atomization head, the 3rd rotation atomization head can be attached to the 2nd rotation atomization head, or 3rd rotation. It is safe to add a fourth rotary atomizing head to the atomizing head. As described above, a coating gun having two types of rotary atomizing heads, a coating gun having three types of rotary atomizing heads, and a coating gun having four or more types of rotary atomizing heads can be obtained.

  However, since the outer diameter of the attached rotary atomizing head becomes too small and the multiple structure of the paint supply path becomes complicated, the paint gun equipped with the first rotating atomizing head and the second rotating atomizing head is the most manufactured. Cheap. Therefore, a coating gun having a first rotating atomizing head and a second rotating atomizing head is recommended.

  Further, in claim 2 and the embodiment, the first pipe 51, the second pipe 53, and the third pipe 55 are provided. However, a fourth pipe may be provided further inside the third pipe 55. When the fourth pipe is provided and coating is performed with the first rotary atomizing head 30, air is supplied to the fourth pipe, and air is ejected from the second paint outflow hole 41 to adhere to the object to be coated. It is possible to prevent the paint that has not been rebounded and adhering to the second rotary atomizing head 40.

  The present invention is more suitable for a coating gun having a first rotary atomizing head and a second rotary atomizing head.

  DESCRIPTION OF SYMBOLS 10 ... Paint gun, 11 ... Gun body, 13 ... Hollow rotating shaft, 18 ... 1st shaping air ejection hole, 30 ... 1st rotation atomization head, 31 ... Center of rotation, 32 ... 2nd which also serves as 1st paint outflow hole Shaping air ejection hole, 33 ... first creepage, 40 ... second rotary atomizing head, 41 ... second paint outflow hole, 42 ... second creepage, 50 ... paint supply path, 51 ... first pipe, 52 ... first Gap between the pipe and the second pipe, 53 ... second pipe, 54 ... gap between the second pipe and third pipe, 55 ... third pipe, 56 ... paint (first paint), 57 ... paint (Second paint), A to D: application pattern, R: predetermined radius.

Claims (4)

In a paint gun having a plurality of rotary atomizing heads that atomize and release paint supplied from a paint supply path by centrifugal force,
The first rotary atomizing head has a first paint outflow hole that allows the paint supplied to the back surface to flow out to the front surface, and a first creeping surface that imparts centrifugal force to the paint flowing out from the first paint outflow hole,
A first shaping air ejection hole for injecting shaping air for adjusting the shape of the paint discharged from the first creepage surface is provided so as to surround the first rotary atomizing head;
The second rotary atomizing head has an outer edge positioned in front of the first paint outflow hole, and is fixed to the first rotary atomizing head, and a second paint outflow hole through which the paint supplied to the back surface flows out to the front surface. And a coating gun having at least two rotary atomizing heads having different outer diameters, such as a second creeping surface that imparts centrifugal force to the paint flowing out from the second paint outflow hole,
The first paint outflow hole serves as a paint outflow hole and an air ejection hole so that the first paint outflow hole is used as a second shaping air ejection hole for ejecting shaping air when the paint does not flow out. gun. The paint supply path includes a first pipe, a second pipe arranged with a gap in the first pipe, and a third pipe arranged with a gap in the second pipe. Multi-tube,
The first paint is supplied to the gap between the first pipe and the second pipe, the shaping air is supplied to the gap between the second pipe and the third pipe, and the second paint is supplied to the third pipe. The paint gun according to claim 1, wherein the paint gun is used. A coating method carried out using the coating gun according to claim 1,
The paint is caused to flow out from the first paint outflow hole, a centrifugal force is applied to the paint along the first creeping surface, and the paint discharged from the first creeping surface is shaped by the air ejected from the first shaping air ejection hole. A first application pattern for adjusting
The paint is caused to flow out from the second paint outflow hole, a centrifugal force is applied to the paint along the second creepage surface, and the paint discharged from the second creepage surface is shaped by the shaping air ejected from the first paint outflow hole. A second application pattern for adjusting
An application method comprising: selecting and implementing at least two application patterns comprising:   4. The coating method according to claim 3, wherein in the second application pattern, the pattern is controlled by controlling the rotational speed of the rotary atomizing head in addition to the shaping air.

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