WO2012033155A1 - 回転霧化塗装装置 - Google Patents
回転霧化塗装装置 Download PDFInfo
- Publication number
- WO2012033155A1 WO2012033155A1 PCT/JP2011/070443 JP2011070443W WO2012033155A1 WO 2012033155 A1 WO2012033155 A1 WO 2012033155A1 JP 2011070443 W JP2011070443 W JP 2011070443W WO 2012033155 A1 WO2012033155 A1 WO 2012033155A1
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- WO
- WIPO (PCT)
- Prior art keywords
- coating
- paint
- bell cup
- back surface
- pattern
- Prior art date
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Classifications
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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
- 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
- B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
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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
- B05B3/1007—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 characterised by the rotating member
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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
- B05B3/1035—Driving means; Parts thereof, e.g. turbine, shaft, bearings
- B05B3/1042—Means for connecting, e.g. reversibly, the rotating spray member to its driving shaft
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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
- 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
- B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
- B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell
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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
- 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
- B05B5/0426—Means for supplying shaping gas
Definitions
- the present invention relates to a technique of a rotary atomizing type coating apparatus used for electrostatic coating.
- a so-called rotary atomizing coating apparatus is known as a coating apparatus for performing electrostatic coating on the body of an automobile or the like.
- a technique for reducing the painting time by enlarging the coating pattern of the paint while the operating speed of the painting robot is equivalent to the conventional one is being studied. If the coating pattern of the paint can be expanded, the overlap can be made larger than before, so that the moving distance of the painting robot becomes shorter than before, and the painting time can be shortened.
- the shaping air blown so as to turn in the rotation direction of the rotary atomizing head is aimed at the discharge end of the rotary atomization head or a little outside the discharge end. It is configured to erupt.
- the blown shaping air diffuses while drawing a spiral trajectory, and resists the action of negative pressure generated in the front area of the rotary atomizing head by the action of centrifugal force, Since it can diffuse without converging on the axial center side, the coating pattern can be enlarged while atomizing the paint.
- the rotary atomizing coating apparatus described in Patent Document 1 is a rotary atomizing coating apparatus for metallic coating, and the application pattern is enlarged when the conventional rotational atomizing coating apparatus for metallic coating is used as a reference.
- the coating pattern is still narrow, so the coating time cannot be shortened sufficiently. It was.
- the coating pattern cannot be effectively expanded. Therefore, it has been desired to develop a rotary atomizing coating apparatus that can be used in general electrostatic coating and can expand the coating pattern of the coating while atomizing the coating.
- the present invention has been made in view of such a problem of the present situation, and can be used in general electrostatic coating, and enables an application pattern of a paint to be expanded while achieving atomization of the paint.
- the object is to provide a rotary atomizing coating device.
- the first invention is arranged in the foremost part in the paint spraying direction and is supported on the rotating shaft, and in the rear part in the paint spraying direction than the bell cup.
- a shaping air ring in which a plurality of air outlets are formed on a circumference centering on an axis, and the axial center direction of the plurality of air outlets is a twist direction with respect to the rotation axis.
- a rotary atomizing coating apparatus in which a plurality of air outlets are formed, wherein an axial center direction of the plurality of air outlets is formed toward a back surface portion which is a back side portion with respect to a spray direction of the paint of the bell cup. Is.
- the axial direction of the plurality of air outlets is a direction in which a swirling flow is formed that has a rotational direction opposite to the rotational direction of the bell cup by the shaping air blown out from the plurality of air outlets. It is formed toward
- a straight portion which is a portion made of a plane parallel to the rotation axis, is formed at the front end portion of the back portion of the bell cup with respect to the spraying direction of the paint.
- 1st invention can aim at the expansion of the coating pattern of a coating material.
- the second invention can expand the coating pattern of the paint and atomize the paint.
- a desired coating pattern of paint can be easily obtained.
- the partial cross section schematic diagram in the side view which shows the coating gun which concerns on one Embodiment of this invention The schematic diagram which shows the coating gun which concerns on 1st embodiment of this invention, (a) The partial cross section schematic diagram in side view, (b) The schematic diagram in front view.
- the schematic diagram which shows the coating gun which concerns on 2nd embodiment of this invention (a) The partial cross section schematic diagram in side view, (b) The schematic diagram in front view.
- the schematic diagram which shows the change of the coating pattern by the shape change of the bell cup edge part The schematic diagram which shows the spreading
- a coating gun 1 which is a rotary atomizing coating apparatus according to a first embodiment of the present invention is a coating apparatus for spraying paint onto an object to be used for electrostatic coating.
- the gun body 2, the bell cup 3, the shaping air ring 4 and the like are provided.
- the gun body 2 is supported by a robot arm (not shown) for displacing the paint gun 1 at a desired position and posture, and is provided with a bell cup 3 and a shaping air ring 4, and an air motor 2a. Is built-in. And from the air motor 2a, the rotating shaft 2b which is a site
- the gun body 2 has a paint supply pipe 2c for supplying paint to the bell cup 3, air supply pipes 2d, 2d for supplying air to the shaping air ring 4, and a high voltage to the gun body.
- a high voltage generator (not shown) for application is built in.
- the bell cup 3 is a member that plays a role of diffusing the paint by applying a centrifugal force to the paint by the rotation of the bell cup 3 when electrostatic painting is performed, and has a concave portion on the inside. It is formed in a bell shape.
- the bell cup 3 is pivotally supported on the rotating shaft 2b in a state in which its axis is aligned with the axis P of the rotating shaft 2b, and is arranged at the foremost part in the paint spraying direction X of the coating gun 1. Yes.
- an extension part 3a which is a part for extending the paint is formed on the inner surface of the bell cup 3, and a paint supply hole 3c which is a through hole part for supplying the paint to the extension part 3a. -3c ...
- the bell cup 3 has an extended portion 3a that is open toward the front side with respect to the spray direction X of the paint, and a back surface portion 3b outside the bell cup 3 is disposed on the rear side with respect to the spray direction X of the paint. As is shown, it is supported by the rotating shaft 2b. In addition, an edge-shaped peripheral end 3d is formed at the boundary between the extended portion 3a and the back surface 3b.
- the shaping air ring 4 is a part for blowing out the shaping air SA.
- the paint that extends from the inner side to the outer side of the axis of the rotating shaft 2b and scatters from the outer peripheral edge part. Is a part that plays a role of spraying in the spraying direction with a desired application pattern by guiding along the flow of the shaping air SA.
- the shaping air ring 4 is a member having a substantially ring shape, and in a state where the axial center thereof coincides with the axial center P in the rear part of the bell cup 3 with respect to the spray direction X of the paint, 2 is attached.
- the shaping air ring 4 is formed with a plurality of outlets 4a, 4a.
- blower outlet 4a * 4a ... is concentric circle centering on the axial center P in front view.
- the angle formed with the axis P is an angle A in the side view
- FIG. 2A is a plan view.
- the axial direction of each of the outlets 4a, 4a,... Is formed in a form that is twisted with respect to the direction of the axial center P so that the angle formed with the axial center P is an angle B. Yes.
- each blower outlet 4a * 4a ... is formed in the direction where the extension line of the axial center cross
- the shaping air SA blown out from the respective outlets 4a, 4a,... Contacts the back surface portion 3b and is diffused along the inclination angle of the back surface portion 3b.
- the inclination angle of the back surface portion 3b is defined as the angle formed between the perpendicular to the axis P and the back surface portion 3b.
- the shaping air SA blown out from the respective outlets 4a, 4a,... Is jetted toward the back surface portion 3b on the back side of the bell cup 3. Therefore, the shaping air SA blown out from each of the outlets 4a, 4a,. A swirling flow is formed.
- the shaping air SA ejected from the respective outlets 24 a, 24 a... Formed in the shaping air ring 24 is sent to the peripheral end 3 d of the bell cup 3, Since it is configured to blow outside the peripheral end 3d, the turning radius is gradually increased according to the angle of each outlet 24a, 24a, etc. without being affected by the inclination angle of the back surface 3b. A swirling flow is formed. For this reason, in the conventional coating gun 21, since the flow toward the radially outer side of the bell cup 3 is hardly formed, the negative pressure region generated in the front portion of the bell cup 3 causes an influence on the front portion of the bell cup 3. The coating pattern of paint is reduced.
- the shaping air SA is blown out along the inclination angle of the back surface portion 3b. A flow toward the outside in the direction is formed. Thereby, it is possible to overcome the influence of the negative pressure region generated in the front portion of the bell cup 3 and to enlarge the coating pattern of the paint.
- the shaping air SA ejected from each of the outlets 4a, 4a,.
- a swirl flow is formed in a swirl direction R opposite to Q.
- the rotation direction of the shaping air SA turning direction R
- the rotation direction Q of the bell cup 3 are reversed, thereby intersecting the scattering direction of the paint splashing from the peripheral end 3d of the bell cup 3. Since the shaping air SA collides in this way, the atomization of the paint is further promoted.
- a conventional general paint gun is configured to blow shaping air straight (that is, not in the twisting direction) toward the back of the bell cup.
- the average particle size of the paint is atomized is 36.4 ⁇ m.
- the width of the coating pattern is 430 mm.
- the shaping air blown in the twisting direction is blown toward the end portion (or further outside the end portion) of the bell cup.
- the state of atomization of the paint in this case has an average particle diameter of 24.7 ⁇ m.
- the width of the coating pattern is 300 mm.
- the general paint gun is superior to the paint gun for metallic paint in terms of the coating pattern, and the paint gun for metallic paint is in terms of atomization of the paint. It is superior to general paint guns.
- the coating gun 1 which concerns on 1st embodiment of this invention, it is set as the aspect which blows the shaping air SA blown off in the twist direction toward the back surface of the bell cup.
- the state of atomization of the paint has an average particle diameter of 24.3 ⁇ m, which is a state of atomization comparable to a conventional coating gun for metallic coating.
- the width of the coating pattern in this case is 420 mm, which is an enlarged situation comparable to the width of the coating pattern of a conventional general paint gun.
- the coating gun 1 according to the first embodiment of the present invention when used, it is applied in the same manner as a conventional general coating gun while achieving the same atomization as a conventional metallic coating gun. It is possible to enlarge the width of the pattern.
- the shaping air SA blown out from the plurality of air outlets 4a, 4a is formed in a direction that forms a swirl flow that is a swirl direction R opposite to the rotation direction Q of the bell cup 3.
- the coating time can be shortened, and a more uniform coating film can be obtained, which can contribute to the improvement of the coating quality.
- the coating gun 1 in the coating gun 1 according to the first embodiment of the present invention, atomization equivalent to that of a conventional general coating gun may be sufficient (that is, the average particle diameter of the paint is 36.36). In the case where the thickness is about 4 ⁇ m), the operation can be performed to reduce the amount of shaping air SA used.
- the air supply pressure to the shaping air ring 4 is reduced to 0.08 MPa, and the bell cup 3 (that is, the rotating shaft 2b of the air motor 2a) is rotated.
- the state of atomization of the paint in this case is that the average particle diameter is 36.4 ⁇ m, and the atomization comparable to the conventional general paint gun is achieved. Can be achieved. Further, the width of the coating pattern in this case is 420 mm, and the width of the coating pattern comparable to a general coating gun is maintained.
- the coating gun 1 according to the first embodiment of the present invention since the reduction in the supply pressure of air and the reduction in the rotation speed of the bell cup lead to a reduction in the amount of air used, if the coating gun 1 according to the first embodiment of the present invention is used, the conventional general The amount of air used can be reduced while ensuring the same paint quality as a simple paint gun. Furthermore, when the amount of air used is reduced, not only the running cost associated with it can be reduced, but also the excess air that does not contribute to electrostatic coating is reduced, and the amount of paint that diffuses with the excess air is reduced. Therefore, the coating efficiency of the paint can be improved.
- the coating gun 1 is arranged at the foremost part in the direction of spraying the paint (the direction of the arrow X shown in FIG. 1), and is supported on the rotating shaft 2b.
- a plurality of air outlets 4a, 4a,... Are formed on the circumference of the cup 3 and the bell cup 3 with respect to the spraying direction of the paint, and centered on the rotating shaft 2b (axial center P).
- a plurality of air outlets 4a, 4a,... So that the axial direction of the air outlets 4a, 4a,.
- It is a rotary atomizing coating apparatus to be formed, and the axial center directions of the plurality of outlets 4a, 4a,... Are formed toward the back surface portion 3b that is the back side portion with respect to the spray direction of the paint of the bell cup 3. To do. With such a configuration, the coating pattern of paint can be expanded.
- a rotary atomizing coating apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 1 and 5.
- the coating gun 1 according to the first embodiment of the present invention the case where the turning direction R of the shaping air SA and the rotation direction Q of the bell cup 3 are reversed is illustrated, but the effect of enlarging the coating pattern is illustrated.
- the turning direction of the shaping air SA and the rotation direction of the bell cup 3 may be the same.
- a coating gun 11 that is a rotary atomizing coating apparatus according to the second embodiment of the present invention is common to the above-described coating gun 1 in the basic configuration, and includes a shaping air ring 14. Only the axial direction of each blower outlet 14a * 14a ... which is formed is different.
- the plurality of air outlets 14a, 14a,... are concentrically centered on the axis P in the front view.
- the angle formed with the axis P is an angle A
- FIG. 5 (a) is a plan view.
- the axial direction of each of the outlets 14a, 14a,... Is formed in a form that is twisted with respect to the direction of the axial center P so that the angle formed with the axial center P is an angle C. Yes.
- the shaping air SA ejected from the outlets 14 a, 14 a... Flows in a swirling direction S in the same direction as the rotation direction Q of the bell cup 3. It is set as the aspect to form.
- the coating pattern of the paint is enlarged. Can be achieved.
- the shaping air SA is blown out along the back surface portion 3b on the back surface of the bell cup 3 to form a swirling flow. It becomes possible to adjust the coating pattern of the paint.
- the inclination angle which is the angle formed between the perpendicular to the axis P of the bell mouth 3 and the back surface portion 3b, is adjusted to change the diffusion state of the shaping air SA and change the coating pattern of the paint. It is configured.
- the inclination angle of the back surface portion 3b is defined as the angle formed between the perpendicular to the axis P and the back surface portion 3b.
- the radius r at the peripheral end 3d of the bell cup 3 is common.
- the width d1 of the coating pattern is used as a reference.
- the width d2 of the coating pattern at that time is the width d1.
- the inclination angle of the back surface portion 3b of the bell cup 3 is changed to change the coating pattern of the shaping air SA. With such a configuration, a desired coating pattern can be easily obtained.
- a straight portion 3e which is a substantially cylindrical portion having a plane parallel to the axis P, is formed. And it is set as the structure which changes the coating pattern of a coating material by changing the formation length in the direction of the axial center P of the said straight part 3e.
- the width d1 of the coating pattern is used as a reference.
- the coating pattern at that time The width d3 is reduced as compared with the width d1.
- the width d4 of the coating pattern at that time is further reduced as compared with the width d3.
- the shaping air SA has a property of proceeding along the inclination angle of the back surface portion 3b and the straight portion 3e, so that the longer the straight portion 3e, the closer to the coating pattern along the diameter of the straight portion 3e. is there.
- the rotation shaft 2b (axial center P) is provided at the circumferential end 3d on the front side with respect to the spraying direction X of the paint on the back surface 3b of the bell cup 3.
- the straight portion 3e which is a portion formed of a plane parallel to the surface, is formed, and the formation length of the straight portion 3e with respect to the rotation axis direction (that is, the lengths L1, L2, etc.) is changed to apply the shaping air SA application pattern. Is to change.
- the relationship between the widths d1 to d4 of the coating patterns in the patterns (1) to (4) shown in FIG. 6 is d4 ⁇ d3 ⁇ d1 ⁇ d2, and the inclination angle of the back surface portion 3b and the straight portion 3e By changing the formation length in various combinations, a desired coating pattern can be obtained.
- the speed component Vay is a speed component that contributes to the coating particle T being applied to the coating surface 30a
- the speed component Vax is a speed that prevents the coating particle T from being applied to the coating surface 30a. It is an ingredient.
- the shaping air SA blown to the back surface portion 3b spreads according to the inclination angle of the back surface portion 3b, but the straight portion 3e.
- the shaping air SA flows along the straight portion 3e.
- the velocity of the paint particles T at this time is Vb, it can be divided into a velocity component Vbx in a direction parallel to the painted surface 30a and a velocity component Vby in a direction perpendicular to the painted surface 30a.
- the velocity component Vby is a velocity component that contributes to the coating particle T being applied to the coating surface 30a
- the velocity component Vbx is a velocity that prevents the coating particle T from being applied to the coating surface 30a. It is an ingredient.
- FIG. 9 shows the measurement results of the film thickness distribution in each case when painting is performed with the bell cup 3 provided with the straight portion 3e and the bell cup 3 without the straight portion 3e.
- the width of the portion that is half the maximum film thickness is defined as the pattern width.
- the maximum film thickness when the straight portion 3e is not provided is Ha and the straight portion 3e is provided.
- the maximum film thickness is defined as Hb.
- the maximum width of the coating film when the straight portion 3e is not provided is defined as Wa
- the pattern width at the portion where the thickness of the coating film is 1/2 Ha is defined as Wc.
- the maximum width of the coating film when the straight portion 3e is provided is defined as Wb
- the pattern width at the portion where the thickness of the coating film is 1/2 Hb is defined as Wd.
- the pattern width Wd when the straight portion 3e is provided is smaller than the pattern width Wc when the straight portion 3e is not provided.
- the maximum width Wb representing the width of the base when the straight portion 3e is provided is smaller than the maximum width Wa when the straight portion 3e is not provided.
- the maximum width Wb (spreading of the skirt of the coating pattern) can be reduced, and the rising of the skirt can be made clearer (the film thickness distribution can be further increased). Therefore, the dispersion of the film thickness distribution is reduced, and it becomes easier to ensure the quality of the coating film in the case of recoating.
- the pattern width Wc can be reduced when the straight portion 3e is provided, the overspray at the coating start portion of the coating object end portion can be suppressed as compared with the case where the straight portion 3e is not provided. Yield can be improved, and as a result, the amount of paint used can be reduced.
- the rotation shaft 2b (axial center P) is provided at the circumferential end 3d on the front side with respect to the spraying direction X of the paint on the back surface 3b of the bell cup 3.
- the straight part 3e which is a site
- the present invention can be applied not only to a rotary atomizing type coating apparatus used for electrostatic coating but also to a rotary atomizing type coating apparatus used when electrostatic coating is not performed.
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Abstract
Description
近年、回転霧化塗装装置においては、塗装時間のさらなる短縮を図りたいというニーズが存在しているが、塗装ロボットをより高速で動作させることによって、塗装時間の短縮を図ることにも限界が近づきつつある。そこで、塗装ロボットの動作速度は従来と同等としつつ、塗料の塗布パターンを拡大することによって、塗装時間の短縮を図ろうとする技術が検討されている。塗料の塗布パターンが拡大できれば、重ねしろを従来よりも大きくすることができるため、塗装ロボットの移動距離が従来に比して短くなり、塗装時間の短縮を図ることが可能になる。
そこで、塗料の微粒化を図りつつ、塗料の塗布パターンを拡大することができる回転霧化塗装装置に関する技術が種々検討されており、例えば、以下に示す特許文献1にその技術が開示され公知となっている。
このような構成により、吹き出させたシェーピングエアが、螺旋状の軌跡を描きつつ拡散し、また、遠心力の作用によって、回転霧化ヘッドの前方領域に発生する負圧の作用に抗して、軸心側に収束することなく拡散することができるため、塗料の微粒化を図りつつ、塗布パターンを拡大することができるものとなっている。
このため、一般的な静電塗装において使用でき、塗料の微粒化を図りつつ、塗料の塗布パターンを拡大できる回転霧化塗装装置の開発が望まれている状況であった。
まず始めに、本発明の第一の実施形態に係る回転霧化塗装装置の全体構成について、図1~図4を用いて説明をする。尚、図1中に示す矢印Xの向きを、塗料の噴霧方向である前方として規定して、以下の説明を行うものとする。
図1に示す如く、本発明の第一の実施形態に係る回転霧化塗装装置である塗装ガン1は、静電塗装に使用する被塗物に対して塗料を噴霧するための塗装装置であり、ガン本体2、ベルカップ3、シェーピングエアリング4等を備えている。
また、ガン本体2には、ベルカップ3に塗料を供給するための塗料供給配管2c、シェーピングエアリング4に空気を供給するためのエア供給配管2d・2d・・・、ガン本体に高電圧を印加するための図示しない高電圧発生装置等が内蔵されている。
ベルカップ3は、その軸心を回転軸2bの軸心Pと一致させた状態で、回転軸2b上に軸支されており、塗装ガン1の塗料の噴霧方向Xにおける最前部に配置されている。
また、ベルカップ3の内面には、塗料を延展させるための部位である延展部3aが形成されており、また、該延展部3aに塗料を供給するための貫通孔部である塗料供給孔3c・3c・・・が形成されており、該塗料供給孔3cに対して前述した塗料供給配管2cから塗料が供給される構成としている。
ベルカップ3は、延展部3aが、塗料の噴霧方向Xに対して前側に向けて開放され、かつ、ベルカップ3の外側の背面部3bが、塗料の噴霧方向Xに対して後側に配置されるように、回転軸2bによって支持されている。また、延展部3aと背面部3bの境界部には、エッジ状の周端部3dを形成している。
シェーピングエアリング4は、略リング状の形状を有する部材であり、塗料の噴霧方向Xに対してベルカップ3よりもさらに後部において、その軸心を軸心Pに一致させた状態で、ガン本体2に付設されている。
そして、シェーピングエアリング4には、複数の吹出口4a・4a・・・が形成されている。
このため、塗装ガン1において、各吹出口4a・4a・・・から吹き出されたシェーピングエアSAは、背面部3bに接触して、該背面部3bの傾斜角度に沿って拡散される。
尚、本実施形態では、背面部3bの傾斜角度は、軸心Pに対する垂線と背面部3bとが成す角度として規定している。
このため、従来の塗装ガン21では、ベルカップ3の半径方向外側に向けた流れがほとんど形成されないため、ベルカップ3の前面部において発生する負圧領域の影響により、ベルカップ3の前面部において、塗料の塗布パターンが縮小する。
このようにシェーピングエアSAの回転方向(旋回方向R)とベルカップ3の回転方向Qを逆向きにすることによって、ベルカップ3の周端部3dから飛散する塗料の飛散方向に対して交差するようにシェーピングエアSAが衝突するようになるため、塗料の微粒化がより促進される。
図4では、シェーピングエアリングに対するエアの供給圧力を0.15MPaとし、ベルカップの回転数を25000rpmとする条件において、(1)従来の一般的な塗装ガン、(2)従来のメタリック塗装用の塗装ガン、(3)本発明の一実施形態に係る塗装ガン、の各塗装ガンを使用して塗料を塗布した場合における、塗料の平均粒径および塗料の塗布パターンの各測定結果を比較して例示している。
この場合における塗料の微粒化の状況は、平均粒径が、36.4μmとなっている。
また、この場合における塗布パターンの幅は、430mmとなっている。
この場合における塗料の微粒化の状況は、平均粒径が、24.7μmとなっている。
また、この場合における塗布パターンの幅は、300mmとなっている。
この場合における塗料の微粒化の状況は、平均粒径が、24.3μmとなっており、これは、従来のメタリック塗装用の塗装ガンに匹敵する微粒化の状況となっている。
また、この場合における塗布パターンの幅は、420mmとなっており、これは、従来の一般的な塗装ガンの塗布パターンの幅に匹敵する拡大状況となっている。
このような構成により、塗料の塗布パターンの拡大を図るとともに、塗料の微粒化を図ることができる。
このため、塗装ガン1を使用した場合には、塗装時間の短縮を図ることができるとともに、より均等な塗膜を得ることが可能になり、塗装品質の向上にも寄与することができる。
塗装ガン1を使用する場合には、図4に示すように、シェーピングエアリング4に対するエアの供給圧力を0.08MPaまで低減させるとともに、ベルカップ3(即ち、エアモータ2aの回転軸2b)の回転数を20000rpmまで低減させた場合であっても、この場合における塗料の微粒化の状況は、平均粒径が、36.4μmとなっており、従来の一般的な塗装ガンに匹敵する微粒化を達成することができる。
また、この場合の塗布パターンの幅は、420mmとなっており、一般的な塗装ガンに匹敵する塗布パターンの幅を保持している。
さらに、エアの使用量が低減されると、それに伴うランニングコストの低減が可能となるばかりでなく、静電塗装に寄与しない余剰エアが減少し、余剰エアに伴って拡散する塗料量が減少するため、塗料の塗着効率を向上させることもできる。
このような構成により、塗料の塗布パターンの拡大を図ることができる。
本発明の第一の実施形態に係る塗装ガン1では、シェーピングエアSAの旋回方向Rとベルカップ3の回転方向Qを逆向きにする場合を例示しているが、塗布パターンを拡大させる効果を得るためには、シェーピングエアSAの旋回方向とベルカップ3の回転方向が同じ向きであってもよい。
図1に示す如く、本発明の第二の実施形態に係る回転霧化塗装装置である塗装ガン11は、基本的な構成において、前述した塗装ガン1と共通しており、シェーピングエアリング14に形成される各吹出口14a・14a・・・の軸心方向のみが相違している。
このように、旋回流の旋回方向Sと、ベルカップ3の回転方向Qを同じ向きとした場合であっても、第一の実施形態に係る塗装ガン1と同様に、塗料の塗布パターンの拡大を図ることができる。
本発明の一実施形態に係る各塗装ガン1・11では、ベルカップ3背面の背面部3bに沿ってシェーピングエアSAを吹き出して旋回流を形成する構成としているため、当該背面部3bの形状によって、塗料の塗布パターンを調整することが可能になる。
尚、本実施形態では、背面部3bの傾斜角度は、軸心Pに対する垂線と背面部3bとが成す角度として規定している。また、ベルカップ3の周端部3dにおける半径rは共通している。
このような構成により、容易に所望する塗料の塗布パターンを得ることができる。
そして、当該ストレート部3eの軸心Pの方向における形成長さを変更することによって、塗料の塗布パターンを変更する構成としている。
図7に示す如く、ストレート部3eを設けないベルカップ3においては、背面部3bに吹付けられたシェーピングエアSAは、背面部3bの傾斜角度に従って、被塗物30に向かって広がっていく。
ここで、速度成分Vayは、塗料粒子Tが塗装面30aに塗着するのに寄与する速度成分であり、一方、速度成分Vaxは、塗料粒子Tが塗装面30aに塗着することを妨げる速度成分である。
ここで、速度成分Vbyは、塗料粒子Tが塗装面30aに塗着するのに寄与する速度成分であり、一方、速度成分Vbxは、塗料粒子Tが塗装面30aに塗着することを妨げる速度成分である。
一般的には、最大膜厚の半分の膜厚となる部分の幅をパターン幅として定義しており、ここでは、ストレート部3eを設けない場合における最大膜厚をHa、ストレート部3eを設けた場合における最大膜厚をHb、と規定している。
また、ストレート部3eを設けない場合における塗膜の最大幅をWaと規定し、塗膜の膜厚が1/2Haとなる部分におけるパターン幅をWcと規定している。
一方、ストレート部3eを設けた場合における塗膜の最大幅をWbと規定し、塗膜の膜厚が1/2Hbとなる部分におけるパターン幅をWdと規定している。
また、ストレート部3eを設けた場合における裾野の幅を表す最大幅Wbが、ストレート部3eを設けない場合における最大幅Waに比して小さくなっている。
このような構成により、容易に所望する塗料の塗布パターンを得ることができる。
Claims (3)
- 塗料の噴霧方向における最前部に配設され、回転軸上に軸支されるベルカップと、
該ベルカップよりも塗料の噴霧方向における後部に配設され、前記回転軸を中心とする円周上に複数の吹出口が形成されるシェーピングエアリングと、
を備え、
前記複数の吹出口の軸心方向が、前記回転軸に対してねじれ方向となるように、前記複数の吹出口が形成される回転霧化塗装装置であって、
前記複数の吹出口の軸心方向を、前記ベルカップの塗料の噴霧方向に対する背面側の部位である背面部に向けて形成する、
ことを特徴とする回転霧化塗装装置。 - 前記複数の吹出口の軸心方向を、
前記複数の吹出口から吹き出したシェーピングエアによって、前記ベルカップの回転方向とは逆向きの回転方向となる旋回流を形成する方向に向けて形成する、
ことを特徴とする請求項1記載の回転霧化塗装装置。 - 前記ベルカップの背面部の塗料の噴霧方向に対する前方側の端部において、
前記回転軸に対して平行な面からなる部位であるストレート部が形成されている、
ことを特徴とする請求項1または請求項2に記載の回転霧化塗装装置。
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CN201180043433.XA CN103097034B (zh) | 2010-09-09 | 2011-09-08 | 旋转雾化涂装装置 |
JP2012533019A JP5552537B2 (ja) | 2010-09-09 | 2011-09-08 | 回転霧化塗装装置 |
EP11823629.8A EP2614895B1 (en) | 2010-09-09 | 2011-09-08 | Rotary atomizing painting device |
US13/821,248 US9295999B2 (en) | 2010-09-09 | 2011-09-08 | Rotary atomizing painting device |
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US (1) | US9295999B2 (ja) |
EP (1) | EP2614895B1 (ja) |
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JP5826662B2 (ja) * | 2012-02-15 | 2015-12-02 | トヨタ自動車株式会社 | 回転霧化式静電塗装機 |
CN103464318B (zh) * | 2013-09-26 | 2015-12-02 | 无锡美灵数码科技有限公司 | 精细喷嘴 |
JP5681779B1 (ja) * | 2013-11-08 | 2015-03-11 | ランズバーグ・インダストリー株式会社 | 静電塗装機 |
CN103752435B (zh) * | 2014-01-15 | 2016-01-13 | 联德(广州)机械有限公司 | 木器水性乳化漆专用旋杯 |
US9505017B2 (en) * | 2014-08-04 | 2016-11-29 | GM Global Technology Operations LLC | Rotary paint atomizer system and method of monitoring a rotary paint atomizer |
JP6181094B2 (ja) * | 2015-02-16 | 2017-08-16 | 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 |
WO2016195044A1 (ja) * | 2015-06-03 | 2016-12-08 | 本田技研工業株式会社 | 塗装装置 |
CN105149124B (zh) * | 2015-07-10 | 2017-12-19 | 杨建林 | 一种多轴旋杯静电喷涂机 |
CN105478263B (zh) * | 2016-01-18 | 2018-10-19 | 杨福毅 | 一种静电雾化器 |
FR3087680B1 (fr) * | 2018-10-30 | 2023-02-10 | Exel Ind | Bol de pulverisation de produit de revetement, projecteur rotatif incluant un tel bol et procede de nettoyage d'un tel projecteur |
CN110947533B (zh) * | 2019-12-17 | 2021-02-12 | 上海水务建设工程有限公司 | 用于管道修复的喷涂装置及其使用方法 |
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EP2614895A1 (en) | 2013-07-17 |
US20130206874A1 (en) | 2013-08-15 |
JPWO2012033155A1 (ja) | 2014-01-20 |
JP5552537B2 (ja) | 2014-07-16 |
CN103097034A (zh) | 2013-05-08 |
EP2614895B1 (en) | 2020-04-08 |
CN103097034B (zh) | 2015-07-15 |
EP2614895A4 (en) | 2017-03-29 |
US9295999B2 (en) | 2016-03-29 |
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