JPH08196945A - Rotary atomizing coating device and coating method using the same - Google Patents

Abstract

(57) [Abstract] [Purpose] In a rotary atomizing coating device having multiple air blowing passages, the strength of shaping air blown from the outer air blowing passages is made uniform in the circumferential direction, and the device configuration is simplified. Try to change. [Structure] A rotary atomizer 12 and a plurality of air blowing passages 30, 32 which are formed in multiples at different radial positions to blow shaping air from the outer peripheral side of the rotary atomizer 12.
And an air supply means 16 for supplying air to the air outlet passages 30 and 32. The air supply means 16 comprises a front end closing tubular member 40 having an air supply opening 42 on a side surface thereof. The air blowing passages 30 and 32 for supplying air are switched by moving the member 40 in a direction intersecting the plurality of air blowing passages 30 and 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizer for atomizing and discharging paint by rotating, and shaping air blown from the outer peripheral side of the rotary atomizer at different positions in the radial direction. Atomizing type coating apparatus provided with a plurality of air blowing passages arranged in a uniform manner and having air blowing directions different from each other, and air supply means for supplying air to the air blowing passage, and a coating method using the same Regarding

[0002]

2. Description of the Related Art Conventionally, a rotary atomizer that atomizes paint by centrifugal force by rotating and discharges it radially outward, and shaping air is blown from the outer peripheral side of the rotary atomizer. A rotary atomizing type coating device comprising an air blowing passage for directing a flow of the atomized paint discharged outward in the radial direction toward an object to be coated, and an air supply means for supplying air to the air blowing passage. It has been known.

A conventional general rotary atomization type coating apparatus is provided with a single air blow passage on the outer peripheral side of the rotary atomizer, that is, one annular air blow passage. 58
Japanese Patent Laid-Open No. 104656 proposes a device provided with double air blowing passages which are provided at predetermined intervals in the radial direction and have the same air blowing direction. In the device disclosed in the publication, the outer air passage is provided at a predetermined distance in the radial direction from the inner air blow passage, and the shaping air is blown in two stages at such a separated position to perform shaping. It is intended to favorably direct the flow of atomized paint while reducing the blowing speed of air.

By the way, as shown in FIG. 13, when the object 2 to be coated is coated by the rotary atomizing type coating apparatus 1, the edge portion 2a of the object to be coated is indicated by an arrow M on the outer side of the edge portion. As the paint 3 blows through and the coating efficiency decreases,
When coating the edge portion 2a, by directing the blowing direction of shaping air to the inner side of the edge portion on the outer side of the edge portion, the direction of the paint flow on the outer side of the edge portion is directed to the inner side of the edge portion (arrow N). It is convenient if the divergence angle can be reduced in the direction). Also, in the case of a large area and a small area of the object to be coated, for example, the bonnet and pillar of the automobile, by changing the blowing direction of the shaping air, in the case of the bonnet, the spread angle of the paint flow is made large to some extent. It would be convenient if the case could be smaller than that.

In response to such a request, the present applicant has previously proposed that FIG.
10 is a sectional view taken along line IX-IX in FIG. 10, FIG. 10 is a sectional view taken along line XX in FIG. 9, FIG. 11 is a sectional view taken along line XI-XI in FIG. 10, and XII- in FIG.
As shown in FIG. 12, which is a cross-sectional view taken along the line XII, the rotary atomizer 4 that atomizes and discharges the paint by rotating, and the shaping air is blown from the outer peripheral side of the rotary atomizer 4 in different radial directions. A plurality of air blowing passages 5 and 6 which are arranged in a double position and have different air blowing directions from each other.
Is divided into four passage sections A (5A, 6A), B (5B, 6B), C (5C, 6C), D (5D,
6D), and the air outlet passage 5,
A rotary atomizing type coating device was proposed in which the blowing direction of the shaping air can be changed over the entire circumference or a part of the circumference by appropriately switching 6 (Japanese Patent Application No. 6-
106963).

[0006]

However, as shown in FIGS. 9 to 12, the above-mentioned coating apparatus is not applicable to each passage section A,
In B, C and D, air supply pipes 8A, 9A to 8D and 9D which are laterally extending air supply means are provided for the respective air supply passages 5 and 6, and the respective passages are provided through these air supply pipes. Air is supplied to each of the air outlet passages 5 and 6 of the section. Therefore, the inside air supply pipes 9A, 9B, 9C, 9D for supplying air to the inside air discharge passage 6 are located through the outside air discharge passage 5, and therefore the outside air discharge passage 5 is provided. In, the air supplied by the outer air supply pipes 8A, 8B, 8C, 8D interferes with the inner air supply pipes 9A, 9B, 9C, 9D and the flow is disturbed by the inner air supply pipes.
As a result, the strength (pressure or speed) of the shaping air blown out from the air outlet 5a of the outer air outlet passage is not uniform in the circumferential direction, and varies, so that the atomized paint is evenly sprayed onto the object to be coated 3. There is a problem that it becomes difficult.

Further, since the air supply pipes must be provided for the respective air outlet passages 5 and 6, the number of air supply pipes to be arranged increases in accordance with the number of the air outlet passages, whereby the device is provided. There is a problem that the structure becomes complicated and cleaning of the device after painting is troublesome.

In view of the above circumstances, an object of the present invention is to prevent the variation in the strength of the shaping air blown from the outside air blowing passage in the circumferential direction and to simplify the structure of the device. An object is to provide a chemical coating apparatus and a coating method using the apparatus.

[0009]

A first rotary atomizing type coating apparatus according to the present invention includes a rotary atomizer for atomizing and discharging a paint by rotating, and an outer peripheral side of the rotary atomizer. A plurality of air ejection passages for ejecting shaping air, which are multiply arranged at different positions in the radial direction and have mutually different air ejection directions, and air supply means for supplying air to the air ejection passages are provided. A rotary atomization type coating apparatus, wherein the air supply means supplies air from the outside in the radial direction, and is arranged so as to be movable in a direction intersecting with the plurality of air blowing passages. It is characterized in that it is constituted by a movement switching type air supply means capable of switching the air outlet passage for supplying air by moving in the direction.

A second rotary atomization type coating apparatus according to the present invention is the same as the first rotary atomization type coating apparatus, wherein the air supply means is arranged at a predetermined interval in the circumferential direction with respect to the air blowing passage. It is characterized in that a plurality of them are arranged.

A third rotary atomizing type coating apparatus according to the present invention is characterized in that, in the second rotary atomizing type coating apparatus, the air supply means can change the pressure of the air supplied. .

A fourth rotary atomizing type coating apparatus according to the present invention is the same as the second rotary atomizing type coating apparatus, in which the air supply means is closed at the front end located on the rotary atomizer side. The front end closing tubular member is provided, and an air supply opening for supplying air to the air blowing passage is formed in a side surface portion of the front end closing tubular member.

The first coating method according to the present invention is the above-mentioned second method.
A method of coating an object to be coated using the rotary atomization type coating device, wherein when coating the vicinity of the edge portion of the object to be coated,
Blow out shaping air on the outside of the edge
It is characterized in that the shaping air is blown from an air blowing passage in which the shaping air is blown toward the inner side of the rotary atomizer rather than the shaping air on the inner side of the edge portion.

A second coating method according to the present invention is the above third method.
A method of coating an object to be coated using the rotary atomization type coating device, wherein when coating the vicinity of the edge portion of the object to be coated,
The pressure of the shaping air blown from the air blowing passage portion located on the outer side of the edge portion is made larger than the pressure of the shaping air blown from the air blowing passage portion located on the inner side of the edge portion. .

[0015]

As described above, in the first rotary atomizing coating apparatus according to the present invention, the air supply means supplies air from the outside in the radial direction, and the plurality of air blowing passages are provided. Since it is arranged so as to be movable in a direction intersecting with each other and the air blowing passage for supplying air can be switched by moving in the intersecting direction, an air supply means is provided for each air blowing passage. Therefore, when supplying air to each air blowing passage, there is no need to locate an air supply means for supplying air to the air blowing passage inside the air blowing passage. As a result, when the air is supplied to a certain air outlet passage as in the above-mentioned conventional technique, the air is supplied to the air outlet passage inside the air outlet passage. (A) There is no risk that the air will interfere with the supply means and the air flow will be disturbed, and shaping air of uniform strength in the circumferential direction can be blown out from the air blowing passage, and Uniform spraying is possible.

Further, as described above, the air supply means is constructed so as to move in a direction intersecting with each air outlet passage to switch and supply air to each air outlet passage. Since it is not necessary to provide each air blowing passage, the number of air supply means can be reduced, the device can be simplified, and the device can be easily washed.

As described above, the second rotary atomizing type coating apparatus according to the present invention is the same as the first rotary atomizing type coating apparatus.
Since the plurality of air supply means are arranged at a predetermined interval in the circumferential direction with respect to the air blowing passage, the blowing direction of the shaping air can be partially changed in the circumferential direction.

As described above, the third rotary atomizing type coating apparatus according to the present invention is the same as the second rotary atomizing type coating apparatus.
Since the air supply means is configured so that the pressure of the supplied air can be changed, the blowing pressure of the shaping air can be partially changed in the circumferential direction.

A fourth rotary atomizing type coating apparatus according to the present invention is the same as the second rotary atomizing type coating apparatus, in which the air supply means has a front end closed on the rotary atomizer side. An air supply opening for supplying air to the air blowing passage is formed on the side surface of the closed tubular member, and the structure can be simplified by constructing the air supply means by such a front closed tubular member, Moreover, the structure of the coating device can be simplified.

The first coating method according to the present invention is the above-mentioned second method.
A method of coating an object to be coated using the rotary atomization type coating device, wherein when coating the vicinity of the edge portion of the object to be coated,
Blow out shaping air on the outside of the edge
Since the shaping air is blown out from the air blowing passage in the direction toward the inner side of the rotary atomizer rather than the shaping air blown on the inner side of the edge portion, when coating the vicinity of the edge portion of the object to be coated, the edge The shaping air on the outer side of the part is blown toward the inner side of the rotary atomizer rather than the shaping air on the inner side of the edge part, that is, toward the inner side of the edge part, and thereby to the outer side of the edge part of the atomized paint. It is possible to suppress the blow-through of the paint and improve the coating efficiency.

The second coating method according to the present invention is the above third method.
A method of coating an object to be coated using the rotary atomization type coating device, wherein when coating the vicinity of the edge portion of the object to be coated,
Since the pressure of the shaping air blown from the air blowing passage portion located on the outer side of the edge portion is made larger than the pressure of the shaping air blown from the air blowing passage portion located on the inner side of the edge portion, the edge portion When painting the vicinity, the shaping air on the outer side of the edge portion is more inward of the rotary atomizer than the shaping air on the inner side of the edge portion, that is, the flow of the atomized paint is directed toward the inner side of the edge portion. The atomized paint can be directed, and thus blow-out of the atomized paint to the outside of the edge portion can be suppressed, and the painting efficiency can be improved.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings.

[Apparatus configuration] FIG. 1 is a partial sectional front view showing an embodiment of a rotary atomizing coating apparatus according to the present invention (a sectional section is a sectional view taken along the line I--I in FIG. 2), and FIG. It is a II-II sectional view taken on the line.

The illustrated rotary atomization type coating device 10 includes a rotary atomizer 12 for ejecting atomized paint radially outward, and a fog ejected from the rotary atomizer 12 radially outward. Air blowing ring 14 for blowing shaping air for directing the flow of chemical paint toward the object to be coated, and the air blowing ring
An air supply means 16 for supplying air to 14 is provided.

The rotary atomizer 12 includes a rotary bell 18, a hollow rotary shaft member 20 which supports and rotates the rotary bell 18.
A paint supply pipe 22 which is disposed in the rotary shaft member 20 and supplies a liquid paint into the rotary bell 18, and the rotary bell 18 is connected to the rotary bell member 18 via the rotary shaft member 20. Liquid paint is supplied into the rotary bell 18 from above by the paint supply pipe 22 while being rotated at a high speed around a central axis extending in the longitudinal direction (vertical direction in the figure), and this liquid paint is centrifugally rotated by the rotary bell 18. It is pressed against the inner peripheral surface to form a thin film, and the thin film liquid paint is also sheared by the centrifugal force from the tip (lower end in the figure) of the rotary bell 18 to be atomized and discharged as an atomized paint toward the outside in the radial direction. .

The air blow-out ring 14 is arranged on the outer peripheral side of the rotary atomizer 12 around the center axis of rotation of the rotary atomizer 12, and has an annular inner ring member 24 and a circular inner ring member 24. An annular intermediate ring member 26 and an annular outer ring member 28 are provided, and an annular inner air blowing passage 30 is provided between the inner ring member 24 and the intermediate ring member 26, and the intermediate ring member 26 and the outer ring. A ring-shaped outer air outlet passage between the member 28 and
32 are formed. Both air outlet passages 30 and 32 are concentrically arranged around the rotation center axis of the rotary atomizer 12, and the outer air outlet passage 32 is located radially outside the inner air outlet passage 30.

The inner ring member 24 and the intermediate ring member 26
Are annular ledges 34, 36 that project radially outward, respectively.
The inner air blow-out passage 30 and the outer air blow-out passage 32 are each provided by the shelves 34 and 36 at a substantially intermediate position in the vertical direction, leaving a predetermined communication gap, and the air reservoir 30 on the upstream side.
a, 32a and downstream inclined air outlets 30b, 32b.

Both air outlet passages 30 and 32 have air outlets 30c and 32c for blowing shaping air at their tips (lower ends in the figure). The inner air outlet 30c and the outer air outlet 32c both have an annular shape, and are slightly rearward (upper in the figure) from the tip of the rotary bell 18 on the outer peripheral side of the rotary bell 18 and close to the tip. Is located. The outer air outlet 32c is the inner air outlet 30.
Located on the outer side in the radial direction from c and both air outlets 30
The inclination angles of c and 32c, that is, the air blowing portions 30b and 32
The inclination angle of b is different, and the inclination angle of the outside air outlet 32c (30 ° in this embodiment) is larger than the inclination angle of the inside air outlet 30c (15 ° in this embodiment), that is, the outside air outlet portion. The inclination direction of 32b is set to be more inward of the rotary bell 18 than the inclination direction of the inner air blowing portion 30b. Thereby, the shaping air blowing direction of the outer air blowing passage 32 is different from the shaping air blowing direction of the inner air blowing passage 30, and the shaping air blowing direction of the outer air blowing passage 32 is more than the shaping air blowing direction of the inner air blowing passage 30. It will face inward of the rotary bell 18.

Further, each of the inner ring member 24 and the intermediate ring member 26 has four partition walls 38 extending in the vertical direction and protruding outward in the radial direction at predetermined intervals in the circumferential direction. By making the outer ends of the portion 38 in the radial direction abut on the inner peripheral surfaces of the intermediate ring member 26 and the outer ring member 28, the inner air blowing passage 30 and the outer air blowing passage 32 respectively form air reservoir portions 30a, 32a and Four air passages 30b and 32b have four passage sections A (30A, 32A), B (30B, 32B), C of the same size in the circumferential direction.
It is divided into (30C, 32C) and D (30D, 32D).

Each of the passage sections A, B, C and D is provided with one air supply means 16 (only the air supply means of the passage section C is shown, the others are omitted). Each air supply means 16 is arranged laterally in each passage section and supplies air to both air blowing passages 30, 32 from the outside in the radial direction, and intersects both air blowing passages 30, 32. Is provided so as to be movable in the radial direction, and the air blowing passage 3 that supplies air by moving in the radial direction
It is possible to switch between 0 and 32 as appropriate.

More specifically, the air supply means 16 is
The rotary bell 18 side, that is, the front end closed tubular member 40 located at the inner side in the radial direction is closed, and the air blowing passage 30 is provided on both sides of the side surface of the front closed tubular member 40. , 32 are formed at a predetermined interval in the front-rear direction with a total of four air supply openings 42. Each of the air supply means 16 is disposed by being inserted through insertion openings 44, 46 formed in the outer ring member 28 and the intermediate ring member 26 so as to be movable back and forth in the radial direction.

The insertion opening 44 of the outer ring member 28 is composed of a large diameter portion and a small diameter portion. The small diameter portion and the insertion opening 46 of the intermediate ring member are substantially the same as the outer diameter of the front end closing tubular member 40. It is said to be the diameter. A flange 48 is formed at the rear end portion of the front end closed tubular member 40, and a compression spring 50 is arranged between the flange 48 and the step portion between the large diameter portion and the small diameter portion, Moreover, the insertion opening 44 of the outer ring member 28.
A stopper plate 52, which has a sealing function of preventing air leakage from the insertion opening 44 and prevents rearward movement of the flange 48, is fixedly provided at the rear end portion of the insertion plate 44. Forward-moving rod 54 fixed to the above-mentioned flange 48
Is pierced so as to be movable back and forth, and the front and rear moving rods 54 are individually connected to actuators (not shown) for each air supply means 16. An air supply pipe 56 is connected to the stopper plate 52, the air supply pipe 56 is connected to an air supply source 58, and the air supply source 58 supplies an air pressure to each air supply means 16. Are independently connected to air pressure control means 60.

4 (A) is a plan view of the outer ring member 28, FIG. 4 (B) is a partial sectional side view of the outer ring member 28, and the left cross-sectional portion is P- in FIG. 4 (A). 4 is a cross-sectional view taken along the line P, and the right side surface portion is a view seen from the direction of arrow Q in FIG. 5B is a bottom view of the intermediate ring member 26,
FIG. 5A is a partial sectional side view of the intermediate ring member 26,
The cross section on the right side is a cross section taken along the line P-P of FIG. 5 (B), and the side section on the left side is a view seen from the direction of arrow Q in FIG. 5 (B). Further, FIG. 6B is a bottom view of the inner ring member 24, FIG. 6A is a partial cross-sectional side view of the inner ring member 24, and the right cross-sectional portion is a cross section taken along the line P-P of FIG. 6B. It is a figure, and the side part on the left side is the figure seen from the arrow Q direction of FIG.6 (B).

[Switching Control of Air Blow-Out Passage] As described above, the air supply means 16 can switch the air blow-out passages 30 and 32 for supplying air by moving in the radial direction. That is, as shown in FIGS. 1 and 2, by pulling the forward / backward moving rod 54 radially outward by the actuator to position the front end closing tubular member 40 at the rearmost position, the front end closing tubular member 40 is moved. Since the front opening 42 is shielded by the intermediate ring member 26 and the rear opening 42 communicates with the outer air blowing passage 32, air is supplied only to the outer air blowing passage 32, and shaping air is supplied only from the outer air blowing opening 32c. Blown out. On the other hand, as shown in FIG. 3, which is a sectional view similar to the left half of FIG. 1, by pushing the forward / backward moving rod 54 inward in the radial direction by the actuator to position the front end closed tubular member 40 at the frontmost position, Since the rear opening 42 of the front end closing tubular member 40 is shielded by the intermediate ring member 26 and the front opening 42 communicates with the inner air blowing passage 30, air is supplied only to the inner air blowing passage 30, and the inner air blowing passage 30 is supplied with air. Shaping air is blown out only from the outlet 30c. Further, if the front end closing tubular member 40 is positioned at a predetermined position intermediate between the rearmost position and the frontmost position, the front opening 42 and the rear opening 42 are provided in the inner and outer air blowing passages 30, 32, respectively. A predetermined amount of air can be communicated, whereby a predetermined amount of air can be supplied to both passages 30 and 32 and shaping air can be blown out by a predetermined amount from both air outlets 30c and 32c.

As described above, the coating apparatus moves in a direction intersecting with the air blowing passages 30, 32 to switch and supply air to the air blowing passages 30, 32. Therefore, it is not necessary to provide an air supply means for each of the air outlet passages. Therefore, when supplying air to the outer air outlet passage 32, air is supplied to the outer air outlet passage 32 to the inner air outlet passage 30. Therefore, the air supply means for supplying the air to the inner air blowing passage 30 is not provided when the air is supplied to the outer air blowing passage 32 as in the above-mentioned conventional technique. There is no risk that air will interfere with each other and the flow of air will be disturbed, and it is possible to blow shaping air of uniform strength in the circumferential direction from the outer air blowing passage 32, and to fog the object to be coated. It is possible to spray the chemical paint uniformly.

Further, as described above, the air supply means 16 is configured to move in a direction intersecting with the air blowing passages 30 and 32 and switch and supply the air to the air blowing passages 30 and 32. Therefore, it is not necessary to provide the air supply means 16 for each of the air outlet passages 30 and 32.
The number of 16 can be reduced, the device can be simplified, and the device can be easily cleaned.

Further, since a plurality of air supply means 16 are arranged at a predetermined interval in the circumferential direction with respect to the air blowing passage, by controlling the position of each air supply means individually, In, it is possible to partially change the blowing direction of the shaping air.

Further, since the air supply means 16 is constructed so that the pressure of the air supplied separately can be varied, the blowing pressure of the shaping air can be partially changed in the circumferential direction.

Further, the air supply means 16 is a rotary atomizer 12
An air supply opening 42 for supplying air to the air blowing passages 30 and 32 is formed in the side surface of the front end closing tubular member 40 whose front end located on the side is closed. By constructing the front end closed tubular member 40, its structure can be simplified and the structure of the coating apparatus can also be simplified.

Next, an example of a concrete air blowing passage switching control when the object to be coated is coated by the coating apparatus will be described with reference to FIG.

FIG. 7 is a schematic plan view showing a state in which the object 62 to be coated is coated.
The case where coating is performed while moving in the direction is shown. In this case, for example, when the coating device is sufficiently distant from the edge portion 62a of the object to be coated (for example, at the left side position in the drawing), each of the passage sections A, B, C, D of the air blowing passage is inward. Air is supplied to the air outlet passage 30 to supply air to the inside air outlet 30.
Blow shaping air from c. Therefore, in this case, the spread angle of the atomized paint is large over the entire circumference, and the paint is sprayed in the range indicated by the broken line in the figure. When the coating device is moved in the direction of arrow R to coat the vicinity of the edge portion 62a of the object to be coated (for example, at the right side position in the figure)
Means that the shaping air is blown out on the outer side of the edge portion from the shaping air blowing passage in which the shaping air blowing direction is toward the inner side of the rotary atomizer rather than the shaping air blowing on the inner side of the edge portion. To That is, air is supplied to the outer air blowing passage 32 in the passage section A on the outer side of the edge portion, and air is supplied to the inner air blowing passage 30 in the other passage sections B, C, and D as before. Therefore, in the passage section A on the outer side of the edge portion, from the outer air outlet 32c,
In the other passage sections B, C, and D, shaping air is blown out from the inner air blowout port 30c as before. By doing so, the air from the outer air outlet 32c is directed toward the inner side of the rotary bell rather than the air from the inner air outlet 30c, so that in the passage section A on the outer side of the edge portion, fog is generated. Since the spread angle of the chemical paint is small and the paint is sprayed in the range shown by the broken line in the figure, it is possible to prevent the atomized paint from blowing through to the outside of the edge portion and improve the coating efficiency.

In the switching control of the air blowing passage, the position sensor (not shown) detects the relative position of the coating device with respect to the object to be coated, and the relative position data is input to the actuator controller (not shown), and the actuator controller is operated. Is performed by controlling the actuator that drives the forward / backward movement rod 54 of each air supply means.

Next, as another example of the air blowing passage switching control, a case where the object to be coated has a large area and a small area, for example, the hood and pillars of an automobile will be described. In this case, in the case of a bonnet having a large area, basically, in each of the passage sections A, B, C, D, the shaping air is blown from the inside air blowing passage 30 to increase the spread angle of the atomized paint, In the case of a pillar having a small area, the spreading angle of the atomized paint is reduced by blowing shaping air from the outside air blowing passage 32 in all the passage sections A, B, C and D. By doing so, in the case of a bonnet having a large area, the coating efficiency can be improved, and in the case of a pillar having a small area, the paint blow-through can be reduced to improve the coating efficiency.

[Pressure change control of supply air] As described above, the air supply means 16 is constructed so that the air pressure supplied by the air pressure control means 60 is variable. In this case, an example of a concrete air pressure switching control when the object to be coated is coated by the coating apparatus will be described with reference to FIG.

FIG. 8 (B) is a schematic front view showing a state in which the object 62 to be coated is coated. When the rotary atomizing type coating device is opposed to the object 62 and is moved in the direction of arrow R, the coating is performed. Indicates. FIG. 8A is a diagram showing an example of air supply pressure control according to the position of the coating apparatus in the above case. In this case, basically, when coating the vicinity of the edge portion 62a of the object to be coated, the pressure of the shaping air blown from the air blowing passage portion located on the outer side of the edge portion is changed to the inner side of the edge portion. The pressure is made larger than the pressure of the shaping air blown from the air blowing passage portion located.

More specifically, when the position of the coating device is from the edge portion 62a of the object to be coated to 20 cm inward of the object to be coated, all the passage sections A, B, C and D are inward. Air is blown from the air blowing passage 30 with the same air pressure, and while moving from that position to a position just above the edge portion of the object to be coated, it is left as it is in the passage sections B, C and D, and the front end is blocked in the passage section A. By gradually advancing the tubular member 40, the air pressure from the inner air blowing passage 30 is gradually decreased, the air is blown from the outer air blowing passage 32, and the air pressure is gradually increased. When the position is reached, the air pressure from the inner air outlet passage 30 is set to zero,
The air pressure from the outside air outlet passage 32 is transferred to another passage section B,
Make the same pressure as C and D. Further, while the coating apparatus is moved from a position directly above the edge portion to a position 20 cm outside the edge portion, in the passage section A, the air pressure from the outer air blowing passage 32 is still increased, and the air pressure is increased. When the predetermined value is reached, the predetermined value is maintained, the same air pressure is continuously maintained in the passage sections B and D, and the air pressure is gradually decreased in the passage section C to determine which of the passage sections A, B and C. 20 cm outward from the edge even in D and D
Zero the air pressure at the position.

By controlling the air pressure as described above, the spread state of the atomized paint 64 becomes as shown in FIG. 8 (B), and when the vicinity of the edge portion 62a is coated, it is directed to the outside of the edge portion 62a. It is possible to suppress blow-by of the atomized paint 64 and improve the coating efficiency.

Next, as another example of the air pressure switching control, a case where the object to be coated has a large area and a small area, for example, the hood and pillars of an automobile are painted will be described. In this case, the air blowing passages may be inside or outside, but in any case, in the case of a bonnet having a large area, basically each passage section A, B, C,
In all of D, the air pressure is made small to increase the spread angle of the atomized paint, and in the case of a pillar having a small area, each passage section A, B,
Both C and D increase the air pressure to reduce the spread angle of the atomized paint. By doing so, in the case of a bonnet having a large area, the coating efficiency can be improved, and in the case of a pillar having a small area, the paint blow-through can be reduced to improve the coating efficiency.

[Modifications] In the above embodiment, the air blowing passages having different blowing directions of the shaping air are provided in double, but the air blowing passages may be provided in triple or more.

Further, in the above embodiment, the air blowing passage is divided into four passage sections in the circumferential direction,
It may be divided into a plurality of passage sections other than four, or may be configured not to be divided. When divided into a plurality of passage sections, it is possible to basically provide one air supply means for each passage section, but a plurality of air supply means may be provided for one passage section. . Even when the air outlet passage is not divided in the circumferential direction, a plurality of air supply means are provided at predetermined intervals in the circumferential direction as in the above embodiment, and the air outlet passage switching control similar to the above is performed. Air pressure change control can be performed.

When the air pressure changing control is performed, the air pressure changing control may be performed alone or in combination with the air blowing passage switching control.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing an embodiment of a rotary atomizing type coating apparatus according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view similar to the left side portion of FIG.

FIG. 4 is a view showing an outer ring member.

FIG. 5 is a diagram showing an intermediate ring member.

FIG. 6 is a view showing an inner ring member.

FIG. 7 is a diagram showing an example of switching control of air outlet passages.

FIG. 8 is a diagram showing an example of supply air pressure change control.

FIG. 9 is a vertical cross-sectional view showing a conventional rotary atomizing coating device.

10 is a sectional view taken along line XX of FIG.

11 is a sectional view taken along line XI-XI of FIG.

FIG. 12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a view showing a coating state of an edge portion of a coated object.

[Explanation of symbols]

 12 Rotary atomizer 16 Air supply means 30, 32 Air blowing passage 40 Front end closed tubular member 42 Air supply opening 62 Coating object 62a Edge part

Front page continuation (72) Inventor Yufumi Taniguchi 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Motor Corporation

Claims (6)

[Claims] 1. A rotary atomizer that atomizes and discharges paint by rotating, and shaping air is blown from the outer peripheral side of the rotary atomizer, which are multiply arranged at different radial positions. A rotary atomization type coating device comprising a plurality of air blowing passages each having a different air blowing direction and an air supplying means for supplying air to the air blowing passages, wherein the air supplying means is radially outward. Is provided so as to supply air from the plurality of air outlet passages, and the air outlet passages for supplying air can be switched by moving in the intersecting direction. A rotary atomization type coating device, characterized in that it is constituted by a movement switching type air supply means. 2. The rotary atomization type coating apparatus according to claim 1, wherein a plurality of the air supply means are arranged at a predetermined interval in the circumferential direction with respect to the air blowing passage. 3. The rotary atomizing type coating apparatus according to claim 2, wherein the air supply means is capable of varying the pressure of the supplied air. 4. The air supply means comprises a front end blocking tubular member having a closed front end located on the rotary atomizer side, and the air blowing passage is provided on a side surface of the front end blocking tubular member. 3. The rotary atomizing type coating apparatus according to claim 2, wherein an air supply opening for supplying air to the inside is formed. 5. A coating method for coating an object to be coated using the rotary atomization type coating device according to claim 2, wherein when the vicinity of the edge of the object to be coated is coated, A method of coating, characterized in that shaping air is blown out from an air blowing passage in which the shaping air blowing direction is toward the inner side of the rotary atomizer rather than the shaping air on the inner side of the edge portion. 6. A coating method for coating an object to be coated using the rotary atomization type coating device according to claim 3, wherein when coating the vicinity of the edge portion of the object to be coated, the edge portion is provided on the outer side of the edge portion. A coating method, wherein the pressure of the shaping air blown from the air blowing passage portion located is made higher than the pressure of the shaping air blown from the air blowing passage portion located inside the edge portion.