WO2021181833A1 - Dispositif de peinture électrostatique de type à atomisation rotative et élément d'aération pour celui-ci - Google Patents

Dispositif de peinture électrostatique de type à atomisation rotative et élément d'aération pour celui-ci Download PDF

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Publication number
WO2021181833A1
WO2021181833A1 PCT/JP2020/048928 JP2020048928W WO2021181833A1 WO 2021181833 A1 WO2021181833 A1 WO 2021181833A1 JP 2020048928 W JP2020048928 W JP 2020048928W WO 2021181833 A1 WO2021181833 A1 WO 2021181833A1
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WIPO (PCT)
Prior art keywords
air
air holes
peripheral side
twist angle
transient
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PCT/JP2020/048928
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English (en)
Japanese (ja)
Inventor
博之 立野
雄治 浜田
淳一 星原
山田　修司
文男 関口
利啓 鈴木
正道 白川
守博 磯崎
Original Assignee
本田技研工業株式会社
Ｃｆｔランズバーグ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 本田技研工業株式会社, Ｃｆｔランズバーグ株式会社 filed Critical 本田技研工業株式会社
Priority to CN202080098419.9A priority Critical patent/CN115297967B/zh
Priority to BR112022015366A priority patent/BR112022015366A2/pt
Priority to JP2022505785A priority patent/JP7389890B2/ja
Publication of WO2021181833A1 publication Critical patent/WO2021181833A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces

Definitions

  • the present invention relates to a rotary atomization type electrostatic coating machine and its airing member.
  • An electrostatic coating method in which paint particles obtained by atomizing a liquid paint are charged and the charged paint particles are attracted to an object to be coated (hereinafter referred to as "work") by electrostatic force.
  • a typical example of a coating machine that realizes this is a rotary atomizing electrostatic coating machine equipped with a rotary atomizing head (hereinafter referred to as "Bell").
  • Bell rotary atomizing head
  • shaping air is generally used to forcibly direct paint particles scattered outward from a high-speed rotating bell to the front. This shaping air can form a circular coating pattern of the desired diameter.
  • Patent Document 1 discloses a rotary atomization type electrostatic coating machine that can be suitably applied to metallic paints.
  • This coating machine is provided with an air ring member that defines the discharge direction of shaping air.
  • the air ring member includes an inner peripheral side air hole located relatively inward in the radial direction and an outer peripheral side air hole located relatively outward.
  • the inner peripheral side shaping air discharged from the inner peripheral side air hole is intended for atomizing the paint.
  • the outer peripheral shaping air discharged from the outer peripheral air holes directs the paint particles forward and contributes to controlling the diameter of the circular coating pattern.
  • Patent Document 1 is a rotary atomization type for the purpose of maintaining coating quality even when a larger amount of liquid coating material (for example, 600cc / min.) Is discharged than before, and for improving coating efficiency.
  • the inner peripheral shaping air is directed to the back of the bell and twisted at an angle of 50 ° or more and less than 60 ° in the direction opposite to the direction of rotation of the bell.
  • the outer peripheral side shaping air is twisted in the direction opposite to the rotation direction of the bell like the inner peripheral side shaping air.
  • twisted and “twisted angle” are terms based on the straight hole disclosed in the following Patent Document 2, and mean that they are inclined in the circumferential direction with respect to the straight hole. There is.
  • the coating pattern of the rotary atomization type electrostatic coating machine is circular. Proposals have already been made to transform this circular coating pattern into an ellipse.
  • a rotary atomization type electrostatic coating machine that realizes an elliptical coating pattern a coating machine that generates an elliptical coating pattern using an external electrode and a coating machine that generates an elliptical coating pattern using shaping air are known. Has been done.
  • Patent Document 2 discloses a rotary atomization type electrostatic coating machine that generates a substantially elliptical coating pattern using shaping air.
  • FIG. 8 attached to the specification of the present application corresponds to FIG. 7 of Patent Document 2.
  • FIG. 9 is a schematic side view for explaining the coating machine of Patent Document 2.
  • reference numeral 200 indicates a coating machine of Patent Document 2.
  • Reference numeral 202 is a bell. The bell 202 rotates in one direction about the axis Ax.
  • Reference numeral 204 is an air ring member. The air ring member 204 is detachably attached to the coating machine main body 206 by a plurality of bolts 208 (FIG. 8).
  • the plurality of bolts 208 are composed of a total of six bolts arranged at equal intervals on the same circumference centered on the axis Ax. By removing all the bolts 208, the air ring member 204 can be positioned at an arbitrary position rotationally displaced about the axis Ax.
  • Patent Document 2 In the rotary atomization type electrostatic coating machine around 1983 when Patent Document 2 was filed, the rotation speed of the bell 202 was 10,000 rpm or less. Patent Document 2 describes that the rotation speed of the rotary atomizing electrostatic coating machine is 30,000 to 100,000 rpm, but at that time, such a high-speed rotating rotary atomizing electrostatic coating machine was not developed. From this fact, 30,000 to 100,000 rpm in Patent Document 2 is an erroneous description, and the correct value is 3,000 to 10,000 rpm.
  • the air ring member 204 has a plurality of air holes 210 arranged on the same circle centered on the axis Ax.
  • the plurality of air holes 210 discharge shaping air SA (FIG. 9).
  • the plurality of air holes 210 form a first group No. 1 and a second group No. 2 that oppose each other in the radial direction on the same circumference centered on the axis Ax.
  • the air ring member 204 is not provided with an air hole in the region between the first air hole group No. 1 and the second air hole group No. 2.
  • the air ring member 204 includes first and second air hole groups No. 1 and No. 2 in the upper and lower regions. , There are no air holes in the left and right regions.
  • Patent Document 2 discloses that a substantially elliptical coating pattern in which the upper and lower parts are crushed is generated by the first and second shaping airs SA (1) and SA (2) that oppose each other across the axis Ax. It is a suggestion. As described above, around 1983 when the application for Patent Document 2 was filed, the rotation speed of the bell 202 was 10,000 rpm or less. The amount of paint discharged at that time was generally about 300 cc / min.
  • the electrostatic coating machine 200 disclosed in Patent Document 2 can position the air ring member 204 at an arbitrary position in which the air ring member 204 is rotationally displaced by removing the plurality of bolts 208.
  • a pattern deformation ring is added as a modification of the embodiment, and the rotation amount of the pattern deformation ring is adjusted to obtain substantially the same effect as the rotation displacement of the air ring member 204.
  • This proposal is to deal with the rotational displacement of the coating pattern about the axis Ax when the coating conditions are changed with the change of the type of paint.
  • FIG. 10 is a diagram for explaining a painting device called "twin bell".
  • FIG. 10 (I) is a plan view of the twin bell coating apparatus 300 as viewed from above, and
  • FIG. 10 (II) is a rear view.
  • the twin bell coating apparatus 300 has a configuration in which two identical rotary atomizing electrostatic coating machines 302 (1) and 302 (2) are arranged on a common base 304.
  • reference numeral W indicates an object to be coated (work).
  • This twin bell painting device 300 is assembled to a painting robot or a reciprocating engine.
  • the alignment directions of the two coating machines 302 (1) and 302 (2) are indicated by reference numerals X (FIG. 10 (I)).
  • the twin bell coating apparatus 300 performs the coating operation while moving in the direction Y (FIG. 10 (II)) orthogonal to the alignment direction X of the two coating machines 302 (1) and 302 (2).
  • the paint discharge amount of each of the coating machines 302 (1) and 302 (2) is about 300 cc / min. A large amount of liquid paint of about 600 cc / min. Can be applied to the paint. As a result, the coating processing efficiency can be improved.
  • Patent Document 2 The inventors of the present application have adopted the technical idea disclosed in Patent Document 2 with the aim of achieving substantially the same coating processing efficiency as the twin bell coating apparatus 300 with one coating machine instead of the twin bell coating apparatus 300.
  • the coating machine that is, the rotary atomization type electrostatic coating machine 200 described with reference to FIGS. 8 and 9, was manufactured and tested under the condition of a paint discharge rate of about 600 cc / min.
  • this experiment was unsuccessful. That is, it was not possible to form a coating pattern having a substantially elliptical shape and a desired paint distribution under the coating conditions of a paint ejection amount of about 600 cc / min., Which is larger than that at the time when Patent Document 2 was filed. ..
  • the rotation speed of the bell 202 was 20,000 to 30,000 rpm, which is generally used at present.
  • the air hole is a straight hole, and shaping air is discharged straight from this straight air hole toward the front.
  • FIG. 11 is a diagram for explaining the produced air ring member 400 and the coating pattern 420 generated by the air ring member 400.
  • FIG. 11 (I) is a view of the air ring member 400 as viewed from the back.
  • the air hole 410 seen in FIG. 11 (I) is shown by a solid line.
  • the air ring member 400 includes first and second air hole groups No. 1 and No. 2 in the upper and lower regions on the same circumference, and the left and right regions. There are no air holes in.
  • the plurality of air holes 410 included in the upper and lower groups No. 1 and No. 2 have the same twist angle. Further, the diameters of the plurality of air holes 410 are all the same.
  • the twisted shaping air SA is discharged from each air hole 410.
  • the terms "twisted angle” and “twisted” are the same as those disclosed in Patent Document 1. It means that it has an inclination angle in the circumferential direction with reference to the "straight hole” disclosed in Patent Document 2.
  • the coating pattern 420 has a peanut-like outer contour. That is, the coating pattern 420 has a vertically crushed shape in which two circular portions 424 (1) and 424 (2) are connected by a relatively narrow connecting portion 426. This shape is preferable. However, the central portions 428 (1) and 428 (2) of the first and second circular portions 424 (1) and 424 (2) become the outer peripheral portions 430 (1), 430 (2) and the connecting portion 426. There was a new problem that the density of the paint was higher than that. This means that it is virtually impossible to make the paint adhering to the work a uniform film thickness.
  • FIG. 12 schematically shows the captured image.
  • FIG. 12 (I) is an image taken immediately after the paint adheres to the work. It can be seen that the liquid paint is concentrated on the two portions 440 (1) and 440 (2) separated from each other on the surface of the work.
  • FIG. 12 (II) is an image taken 2-3 seconds after the paint adheres to the work. From this image, it can be seen that the paint adhesion region expands outward from the two paint concentrated portions 440 (1) and 440 (2).
  • Reference numerals 442 (1) and 442 (2) indicate the outer peripheral portions generated by expanding the paint adhesion region outward from the two paint concentrated portions 440 (1) and 440 (2). Then, it was found that the coating pattern 420 of FIG. 11 (II) described above was finally generated by the adhesion region of the liquid paint. That is, the first and second central portions 428 (1) and 428 (2) of the coating pattern 420 (FIG. 11 (II)) become the paint concentrated portions 440 (1) and 440 (2) immediately after the paint adheres, respectively. It corresponds.
  • the inventors of the present application understood that the series of captured images of the above high-speed camera teaches the following. That is, in a large amount of paint discharged at 600 cc / min., By adopting twisted shaping air, the coating pattern 420 can be deformed into a crushed shape (FIG. 11 (II)).
  • this coating pattern 420 includes the first and second central portions 428 (1) and (2) having high paint densities, the coating film of the paint adhering to the work becomes non-uniform.
  • the reference symbol “R” shown in FIG. 11 (I) indicates the direction of rotation of the bell.
  • the coating pattern 420 is rotationally displaced in the same direction as the rotation direction R of the bell.
  • the painting conditions were as follows. (i) Bell rotation speed: 20,000 rpm to 30,000 rpm. (ii) Air pressure of shaping air SA: 2.0Kgf / cm 2 . (iii) Paint discharge rate: 600 cc / min.
  • the problem of rotational displacement of the coating pattern 420 does not need to be considered as a problem if the applicable paint is limited to one.
  • the problem of rotational displacement is seen as a problem when applied to various paints.
  • this problem can be solved by displacing the fixed position of the air ring member 400 around the axis Ax.
  • FIG. 13 is a diagram corresponding to FIG.
  • the characteristics of paint differ depending on the color of the paint.
  • the electrostatic coating machine is generally controlled to change the bell rotation speed and the pressure of the shaping air according to the characteristics of the paint.
  • experiments were conducted to change the bell speed and / or the pressure of the shaping air in order to investigate the adaptability to the change of the bell speed and the pressure of the shaping air.
  • the resulting coating pattern is shown in FIG. FIG. 14 (I) shows the coating pattern 420 (A) when the bell rotation speed is changed from 20,000 rpm to 30,000 rpm.
  • FIG. 14 (II) shows the coating pattern 420 (B) when the pressure of the shaping air is changed from 2.0 Kgf / cm 2 to 3.0 Kgf / cm 2 while the bell rotation speed is maintained at 30,000 rpm. Note that FIG. 14 is a diagram corresponding to FIG.
  • the twin bell coating apparatus 300 (FIG. 10) has the advantage of being able to improve the coating processing efficiency, as described above.
  • the twin bell coating device 300 requires two electrostatic coating machines 302 (1) and 302 (2). If one coating machine can achieve coating with substantially the same quality as the twin bell coating apparatus 300, the cost of the coating machine, related peripheral equipment, and equipment including control equipment can be significantly reduced.
  • the coating pattern 420 includes the central portions 428 (1) and 428 (2) having high paint densities at positions separated from each other.
  • the coating pattern is rotationally displaced in response to the change.
  • a main object of the present invention is a rotary atomization type electrostatic coating machine capable of generating a coating pattern having a crushed circular shape using shaping air and optimizing the coating distribution in the coating pattern.
  • the purpose is to provide an airing member.
  • a further object of the present invention is a rotary atomization type electrostatic coating machine capable of optimizing the paint distribution in the crushed coating pattern and suppressing the rotational displacement of the coating pattern even when applied to various paints.
  • the purpose is to provide an air ring member.
  • a further object of the present invention is to provide a rotary atomization type electrostatic coating machine that can be replaced with a twin bell coating device and an airing member thereof.
  • a rotating atomizing head that emits liquid paint particles
  • a plurality of mains constituting the first and second main groups arranged so as to oppose the radial direction on the first circumference centered on the rotation axis of the rotary atomizing head and having a first twist angle.
  • a plurality of inner peripherals located on the inner peripheral side of the plurality of main air holes, arranged over the entire circumference on the second circumference centered on the axis of the rotary atomizing head, and having a second twist angle.
  • Peripheral air hole and The outer peripheral side shaping air is discharged from the plurality of main air holes of the first and second main groups, and the outer peripheral side shaping air is discharged.
  • the inner peripheral side shaping air is discharged from the plurality of inner peripheral side air holes, and the inner peripheral side shaping air is discharged.
  • the inner peripheral side shaping air is stronger than the outer peripheral side shaping air
  • the first twist angle of each of the main air holes is a twist angle opposite to the rotation direction of the rotary atomizing head
  • the second twist angle of each of the inner peripheral side air holes is the rotary mist.
  • the twist angle is the same as the direction of rotation of the head.
  • the first twist angle of each of the main air holes is the twist angle in the same direction as the rotation direction of the rotary atomizing head
  • the second twist angle of each of the inner peripheral side air holes is the rotary atomization. This is achieved by providing a rotary atomizing electrostatic coating machine characterized by a twist angle opposite to the direction of rotation of the head and an airing member included therein.
  • the twisted outer peripheral side shaping air has the function of crushing the application pattern.
  • the twisted inner peripheral side shaping air has a function of optimizing the paint distribution in the coating pattern and making the coating film of the paint adhering to the work uniform. Then, by twisting the outer peripheral side shaping air and the inner peripheral side shaping air in opposite directions, it is possible to obtain the effect of suppressing the rotational displacement of the coating pattern even when applied to various paints.
  • the coating density of the central portion CP is low as compared with that of the central portion CP and the outer peripheral portion OP.
  • the size of the central CP which has a relatively low paint density, changes depending on the strength of the shaping air.
  • FIG. 15 (I) shows a coating pattern when the shaping air is weak
  • FIG. 15 (II) shows a coating pattern when the shaping air is strong.
  • the central CP expands (Fig. 15 (I)).
  • the central CP becomes smaller (Fig. 15 (II)).
  • the present invention is further characterized in that the strengths of the twisted shaping air inside and outside that are discharged diagonally forward from the air ring are different.
  • the inner peripheral side shaping air is stronger than the outer peripheral side shaping air.
  • the paint particles are conveyed toward the work by the strong propulsive force of the inner peripheral side shaping air, and the central portion CP having a low paint density is formed.
  • the paint distribution in the coating pattern can be optimized.
  • the circular coating pattern can be deformed into a crushed shape by the relatively weak outer peripheral side shaping air SA.
  • the outer peripheral side shaping air and the inner peripheral side shaping air are twisted in relatively opposite directions in order to generate a coating pattern having a crushed circular shape and to optimize the paint distribution in the coating pattern. It was found that this is effective in suppressing the rotational displacement of the coating pattern. Specifically, it was found that one of the following two combinations is effective.
  • the first twist angle of the outer peripheral side shaping air is the twist angle in the direction opposite to the rotation direction of the bell.
  • the second twist angle of the inner peripheral side shaping air is the twist angle in the same direction as the rotation direction of the bell.
  • the first twist angle of the outer peripheral side shaping air is the twist angle in the same direction as the rotation direction of the bell.
  • the second twist angle of the inner peripheral side shaping air is the twist angle in the direction opposite to the rotation direction of the bell.
  • the first twist angle of the outer peripheral side shaping air is the twist angle in the direction opposite to the rotation direction of the bell.
  • the second twist angle of the inner peripheral side shaping air is the twist angle in the direction opposite to the rotation direction of the bell.
  • ⁇ Fourth combination (1)
  • the first twist angle of the outer peripheral side shaping air is the twist angle in the same direction as the rotation direction of the bell.
  • the second twist angle of the inner peripheral side shaping air is the twist angle in the same direction as the rotation direction of the bell.
  • FIG. 7 is a view corresponding to FIG.
  • FIG. 7 of Patent Document 2 is a front view of an airing member incorporated in a conventional coating machine that generates an elliptical coating pattern by shaping air.
  • FIG. 8 is a diagram for explaining a configuration of a conventional coating machine incorporating the illustrated air ring member.
  • (I) is a diagram for explaining the arrangement of the two coating machines of the twin bell coating device, and
  • (II) is a diagram for explaining the moving direction of the twin bell coating device. It is a figure for demonstrating that a coating pattern of a crushed circle shape can be generated by using twisted shaping air
  • (I) is a rear view of the used air ring member
  • (II) is a coating pattern. It is a front view of.
  • FIG. 11 is a diagram for explaining an image captured by a high-speed camera in order to analyze the problem of the illustrated coating pattern, and (I) shows a state immediately after the paint adheres to the work, and (II). ) Indicates the state after 2-3 seconds. It is a figure for demonstrating the state in which the air ring member was installed at the position which was rotationally displaced in order to correct the rotational displacement of the coating pattern generated by using the twisted shaping air, and is the figure corresponding to FIG.
  • FIG. 1 and 2 are views for explaining the rotary atomization type electrostatic coating machine 10 of the embodiment.
  • the liquid paint is supplied to the central portion of the bell 12. Further, a negative high voltage is applied to the bell 12.
  • the coating machine 10 discharges the charged paint particles from the outer peripheral edge of the bell 12 to the outside by rotating the bell 12 at high speed by an air motor (not shown).
  • FIG. 3 is a front view of the air ring member 14 as viewed from the front.
  • the air ring member 14 has a pair of air holes No. 1 and No. 2 located on the first circumference centered on the axis Ax and opposed to each other with the bell rotation axis Ax in between. .. That is, the first and second main groups No. 1 and No. 2 are located opposite to each other in the radial direction.
  • the first and second main groups No. 1 and No. 2 are composed of a plurality of first air holes 142, and the outer peripheral side shaping air SA (out) is discharged from the plurality of first air holes 142. ..
  • the air ring member 14 also has a plurality of second air holes 146 on the inner peripheral side of the plurality of first air holes 142.
  • the plurality of second air holes that is, the inner peripheral side air holes 146 are arranged at equal intervals over the entire circumference on the second circumference centered on the bell axis Ax.
  • the inner peripheral side shaping air SA (in) is discharged from the inner peripheral side air hole 146.
  • the inner peripheral side shaping air SA (in) is stronger than the outer peripheral side shaping air SA (out).
  • the plurality of first air holes constituting the first and second main groups No. 1 and No. 2 related to the outer peripheral side shaping air SA (out), that is, the outer peripheral side air holes 142 are all circular holes having the same diameter in cross section. be. Further, the plurality of second air holes that generate the inner peripheral side shaping air SA (in), that is, the inner peripheral side air holes 146 are all circular holes having the same diameter in cross section.
  • the outer peripheral side shaping air SA (out) is directed toward a position away from the outer peripheral edge of the bell 12.
  • the inner peripheral side shaping air SA (in) is directed toward the outer peripheral edge of the bell 12.
  • the inner peripheral side shaping air SA (in) may be directed to a position away from the outer peripheral edge of the bell 12. This separation distance is preferably in the range of about 5 mm from the outer peripheral edge of the bell 12.
  • the outer peripheral side shaping air SA (out) and the inner peripheral side shaping air SA (in) are twisted in relatively opposite directions. More specifically, with reference to FIGS. 1 and 3, the outer peripheral side shaping air SA (out) is twisted in the direction opposite to the rotation direction R of the bell 12. On the other hand, the inner peripheral side shaping air SA (in) is twisted in the same direction as the rotation direction R of the bell.
  • the outer peripheral side shaping air SA (out), that is, the first twist angle ⁇ out (FIG. 1) of the outer peripheral side air hole 142 is 45 ° in the direction opposite to the rotation direction R of the bell 12.
  • the twist angle ⁇ out of the outer peripheral air hole 142 is not limited to 45 °.
  • the first twist angle ⁇ out may be 10 ° to 60 °, preferably 30 to 50 °.
  • the inner peripheral side shaping air SA (in) that is, the second twist angle ⁇ in of the inner peripheral side air hole 146 is 45 ° in the same direction as the rotation direction R of the bell 12 (FIGS. 1 and 2).
  • the twist angle ⁇ in of the inner peripheral side air hole 146 is not limited to 45 °.
  • the second twist angle ⁇ in may be 10 ° to 60 °, preferably 30 to 50 °.
  • the inner peripheral side shaping air SA (in) is stronger than the outer peripheral side shaping air SA (out).
  • compressed air is supplied to the outer peripheral side air hole 142 from the outer peripheral side air chamber 28.
  • Compressed air is supplied from the inner peripheral side air chamber 30 to the inner peripheral side air hole 146.
  • Compressed air is supplied from the common compressed air source 32 to the outer peripheral side air chamber 28 and the inner peripheral side air chamber 30 through the first and second air pressure adjusting units 34 and 36.
  • the pressure of the compressed air supplied to the outer peripheral side and inner peripheral side air chambers 28 and 30 can be controlled by the outer peripheral side and inner peripheral side air pressure adjusting units 34 and 36.
  • the inner and outer air holes 142 and 146 have the same diameter, specifically 1.0 mm. Then, the pressure of the compressed air supplied to the inner peripheral side air chamber 30 is set to a value higher than that of the outer peripheral side air chamber 28.
  • the diameter of the bell 12 is 60 mm.
  • the amount of paint discharged, the number of revolutions of the bell, and the pressure of the compressed air supplied to the outer peripheral side and inner peripheral side air chambers 28 and 30 can be controlled by a control signal from a control panel (not shown).
  • the rotation speed of the bell 12 was controlled in the range of 30,000 to 40,000 rpm, and the pressure of the outer peripheral side shaping air SA (out) was fixed at 0.5 Kgf / cm 2.
  • the pressure of the inner peripheral side shaping air SA (in) was controlled in the range of 1.5 to 2.0 Kgf / cm 2 which is higher than the outer peripheral side shaping air SA (out).
  • the coating pattern 40 shown in FIG. 4 could be generated.
  • the coating pattern 40 had an elliptical outer contour, and the width in the major axis direction was 630 to 650 mm.
  • the coating pattern 40 was composed of an outer peripheral portion OP in which the amount of paint was large and the paint density was substantially uniform, and an inner peripheral portion CP in which the paint was thin. As a result, a coating film having a uniform film thickness could be formed on the work surface.
  • the whiskers 42 were found in the coating pattern 420 generated by the conventional coating machine 200 described with reference to FIGS. 8 and 9.
  • the application pattern 420 in which the whiskers 42 are generated is shown in FIG.
  • the whiskers 42 appeared at the four corners of the application pattern 420.
  • the inventors of the present application have examined the airing member 14 (FIG. 3) of the first embodiment with the aim of realizing a more preferable coating pattern without a whiskers 42.
  • the air holes are completely present in the region sandwiched between the first and second main groups No. 1 and No. 2 composed of the plurality of outer peripheral side air holes 142.
  • the inventors of the present application have an extreme configuration between the region where the air holes 142 of the first main group No. 1 and the second main group No. 2 exist and the region where the air holes 142 do not exist at all. It was speculated that the difference was the cause of the whiskers 42. Based on this inference, additional air holes are provided in each transient region at both ends of the first main group No. 1 and the second main group No. 2, and relatively weak air is discharged from the additional air holes. I came up with that.
  • FIG. 5 shows the air ring member 50 of the second embodiment.
  • This FIG. 5 corresponds to FIG. Therefore, the air ring member 50 of the second embodiment will be described using the reference reference numerals used in FIG.
  • the air ring member 50 of the second embodiment has a total of four transient groups 152 that are continuous at both ends of the first main group No. 1 and the second main group No. 2.
  • the transient group 152 is composed of a plurality of transient air holes 154, and compressed air is supplied from the outer peripheral side air chamber 28 to the plurality of transient air holes 154.
  • the air discharged from the transient group 152 constitutes a part of the outer peripheral side shaping air SA (out).
  • the plurality of transient air holes 154 are arranged at equal intervals on the first circumference common to the outer peripheral side air holes 142 of the first main group No. 1 and the second main group No. 2.
  • Each transient air hole 154 is the same as the outer peripheral side air hole 142 in that it has a first twist angle of 45 ° in the direction opposite to the rotation direction R of the bell 12.
  • the air discharged from the plurality of transient air holes 154 is the first and first. It is weaker than the air discharged from the plurality of main air holes 142 constituting the main groups No. 1 and No. 2 of 2.
  • the outer peripheral air chamber 28 (FIG. 2) for supplying air to the main air hole 142 is used to supply air from the outer peripheral air chamber 28 to the transient air hole 154
  • the main air chamber 28 is used.
  • the diameter of the transient air hole 154 may be smaller than that of the air hole 142.
  • the diameter of the transient air hole 154 may be set to, for example, 0.8 mm.
  • the plurality of transient air holes 154 may all be formed of holes having the same diameter.
  • the diameter of each of the plurality of transient air holes 154 constituting the transient group 152 gradually or gradually increases as it approaches the end of the first main group No. 1 or the second main group No. 2. It may be designed to have a large diameter.
  • a plurality of transient air holes 154 constituting each transient group 152 are composed of two types of holes having a diameter of 0.8 mm and a diameter of 0.6 mm, and the first main group No. 1 or the second is formed.
  • the transient air hole 154 close to the main group No. 2 is composed of air holes with a diameter of 0.8 mm, and the transient air hole 154 far from the first main group No. 1 or the second main group No. 2 is 0.6 mm in diameter. It may be composed of the air holes of.
  • FIG. 6 shows the air ring member 60 of the third embodiment.
  • the air ring member 60 is also a modified example of the air ring member 50 of the second embodiment.
  • the air ring member 60 of the third embodiment has two transient groups 152 extending from both ends of the first main group No. 1 and two transient groups extending from both ends of the second main group. It has two complementary groups 162, each of which is continuous with 152.
  • the plurality of complementary air holes 164 constituting each complementary group 162 are the main air holes 142 of the first main group No. 1 and the second main group No. 2 and the transient air holes 154 of the transient group 152 adjacent thereto. They are arranged at equal intervals on the first circumference in common with. Compressed air is supplied from the outer peripheral side air chamber 28 to the plurality of complementary air holes 164.
  • the air discharged from the complement group 162 constitutes a part of the outer peripheral side shaping air.
  • the air ring member 60 of the third embodiment can discharge the outer peripheral side shaping air SA (out) from the plurality of complementary air holes 164, the main air holes 142, and the transient air holes 154 over the entire circumference.
  • the complementary air hole 164 is the same as the main air hole 142 and the transient air hole 154 in that it has a first twist angle of 45 ° in the direction opposite to the rotation direction R of the bell 12.
  • the air discharged from the plurality of complementary air holes 164 is weaker than the air discharged from the plurality of transient air holes 154.
  • air is supplied from the outer peripheral side air chamber 28 to the transient air hole 154 and the complementary air hole 164 by using the outer peripheral side air chamber 28 (FIG. 2) that supplies air to the main air hole 142. If this is the case, the diameter of the complementary air hole 164 may be smaller than that of the transient air hole 154.
  • the diameter of the main air hole 142 was 1 mm
  • the diameter of the transient air hole 154 was 0.8 mm
  • the diameter of the complementary air hole 164 was 0.5 mm.
  • FIG. 7 shows the action of the outer peripheral side shaping air SA (out) and the inner peripheral side shaping air SA (in) in the rotary atomization type electrostatic coating machine incorporating the air ring member 60 (FIG. 6) of the third embodiment. It is a figure for conceptually explaining that an elliptical coating pattern 40 is formed by superimposing the action of).
  • FIG. 7 (I) shows a first pattern 70 formed only by the outer peripheral side shaping air SA (out) without the inner peripheral side shaping air SA (in).
  • the outer contour of the first pattern 70 is substantially rectangular.
  • FIG. 7 (II) shows a second pattern 72 formed only by the inner peripheral side shaping air SA (in) without the outer peripheral side shaping air SA (out).
  • the outer contour of the second pattern 72 is circular.
  • the coating machine 10 incorporating the air ring member 60 of the third embodiment can achieve the same coating quality as the twin bell coating apparatus 300 (FIG. 10).
  • the rotary atomization type electrostatic coating machine according to the present invention is effective for the following coating conditions.
  • Bell rotation speed 20,000-45,000 rpm. Preferably 30,000-40,000 rpm.
  • Paint discharge rate 200 to 600 cc / min. Preferably 300-500 cc / min.
  • Applicable paints water-based and oil-based paints. Metallic paint, clear paint, solid paint.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Abstract

Ce dispositif de peinture électrostatique de type à atomisation rotative produit un motif de peinture en forme de cercle aplati à l'aide d'air de mise en forme et crée une distribution appropriée de peinture à l'intérieur du motif de peinture. Ce dispositif de peinture électrostatique comprend : une pluralité de trous d'air principaux (142), constituant des premier et second groupes principaux (n° 1, n° 2) disposés à l'opposé l'une de l'autre dans la direction radiale sur une première circonférence, et ayant chacun un premier angle de torsion (θout) ; et une pluralité de trous d'air côté circonférence interne (146), disposés le long de l'ensemble d'une seconde circonférence située sur le côté de la circonférence interne de la pluralité de trous d'air principaux (142), et ayant chacun un second angle de torsion (θin). L'air de mise en forme côté circonférence externe SA (out) est évacué des trous d'air principaux (142). L'air de mise en forme côté circonférence interne SA (in) est évacué des trous d'air côté circonférence interne. L'air de mise en forme côté circonférence interne SA (in) est plus puissant que l'air de mise en forme côté circonférence externe SA (out). Le premier angle de torsion (θout) est un angle de torsion dans la direction opposée à la direction de rotation d'une tête d'atomisation rotative, et le second angle de torsion (θin) est un angle de torsion dans la même direction que la direction de rotation de la tête d'atomisation rotative. En variante, le premier angle de torsion (θout) est un angle de torsion dans la même direction que la direction de rotation d'une tête d'atomisation rotative, et le second angle de torsion (θin) est un angle de torsion dans la direction opposée à la direction de rotation de la tête d'atomisation rotative.
PCT/JP2020/048928 2020-03-10 2020-12-25 Dispositif de peinture électrostatique de type à atomisation rotative et élément d'aération pour celui-ci WO2021181833A1 (fr)

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CN202080098419.9A CN115297967B (zh) 2020-03-10 2020-12-25 旋转雾化式静电涂装机及其空气环部件
BR112022015366A BR112022015366A2 (pt) 2020-03-10 2020-12-25 Aparelho de pintura eletrostática do tipo com atomização rotacional e membro de ventilação para a mesmo
JP2022505785A JP7389890B2 (ja) 2020-03-10 2020-12-25 回転霧化式静電塗装機及びそのエアリング部材

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JPH0884941A (ja) * 1994-07-22 1996-04-02 Nissan Motor Co Ltd 回転霧化静電塗装方法および装置
JPH0899052A (ja) * 1994-09-29 1996-04-16 Abb Ransburg Kk 回転霧化頭型塗装装置
JP2008093521A (ja) * 2006-10-06 2008-04-24 Ransburg Ind Kk 回転式静電塗装装置
JP2009214065A (ja) * 2008-03-12 2009-09-24 Ransburg Ind Kk 回転式静電塗装装置及び塗装パターン制御方法
JP2011524801A (ja) * 2008-06-12 2011-09-08 デュール システムズ ゲゼルシャフト ミット ベシュレンクテル ハフツング 汎用アトマイザ
JP2016150265A (ja) * 2015-02-16 2016-08-22 トヨタ自動車株式会社 回転霧化型静電塗装機及びそのシェーピングエアリング
JP2018161642A (ja) * 2017-03-27 2018-10-18 トヨタ車体株式会社 回転霧化型静電塗装機及びそのシェーピングエアリング

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DE102007006547B4 (de) 2007-02-09 2016-09-29 Dürr Systems GmbH Lenkluftring und entsprechendes Beschichtungsverfahren

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0884941A (ja) * 1994-07-22 1996-04-02 Nissan Motor Co Ltd 回転霧化静電塗装方法および装置
JPH0899052A (ja) * 1994-09-29 1996-04-16 Abb Ransburg Kk 回転霧化頭型塗装装置
JP2008093521A (ja) * 2006-10-06 2008-04-24 Ransburg Ind Kk 回転式静電塗装装置
JP2009214065A (ja) * 2008-03-12 2009-09-24 Ransburg Ind Kk 回転式静電塗装装置及び塗装パターン制御方法
JP2011524801A (ja) * 2008-06-12 2011-09-08 デュール システムズ ゲゼルシャフト ミット ベシュレンクテル ハフツング 汎用アトマイザ
JP2016150265A (ja) * 2015-02-16 2016-08-22 トヨタ自動車株式会社 回転霧化型静電塗装機及びそのシェーピングエアリング
JP2018161642A (ja) * 2017-03-27 2018-10-18 トヨタ車体株式会社 回転霧化型静電塗装機及びそのシェーピングエアリング

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CN115297967A (zh) 2022-11-04
JP7389890B2 (ja) 2023-11-30

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