JP3541378B2 - Rotary atomizing electrostatic coating equipment - Google Patents

Rotary atomizing electrostatic coating equipment Download PDF

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Publication number
JP3541378B2
JP3541378B2 JP23812696A JP23812696A JP3541378B2 JP 3541378 B2 JP3541378 B2 JP 3541378B2 JP 23812696 A JP23812696 A JP 23812696A JP 23812696 A JP23812696 A JP 23812696A JP 3541378 B2 JP3541378 B2 JP 3541378B2
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Prior art keywords
paint
atomizing head
supply
mixing chamber
electrostatic coating
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JPH1080649A (en
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辺 正 実 渡
越 淳 水
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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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
    • B05B3/1057—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 with at least two outlets, other than gas and cleaning fluid outlets, for discharging, selectively or not, different or identical liquids or other fluent materials on the rotating element
    • 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
    • B05B3/1064—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 the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft

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  • Electrostatic Spraying Apparatus (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、自動車製造工程における車体塗装に用いられる回転霧化静電塗装装置に関するものである。
【０００２】
【従来の技術】
回転霧化静電塗装装置は、エア霧化静電塗装などに比べて塗料の塗着効率が高く、自動車の車体塗装などに多用されている。また、車体塗装に用いる回転霧化静電塗装装置としては、複数の塗装色に対処するために色替えの機能を備えたものがあり、その一例を図２に示す。
【０００３】
図示の回転霧化静電塗装装置１００は、高速回転するカップ状の霧化頭１０１ａを備えた塗装ガン１０１、複数の色の塗料の各供給装置（図示せず）、各供給装置からの供給路１０２ａ〜１０２ｅが接続される色替えバルブ１０３、色替えバルブ１０３と塗装ガン１０１の間を接続し且つ中間に塗料圧送用のポンプ１０４を設けた供給パイプ１０５などで構成してある。塗装ガン１０１は、塗装粒子に負の高電圧を印荷する電極や、塗料粒子を被塗装物に向けて吹き飛ばすシェーピングエアの噴射手段を備えており、アースされた図外の被塗装物に対向している。各供給装置は、塗料タンクや塗料を色替えバルブ１０３に定量供給するためのポンプ付の循環装置などを備えている。色替えバルブ１０３には、図示しない洗浄用シンナーの供給装置からの供給路１０２ｆが接続してある。
【０００４】
上記の回転霧化静電塗装装置１００は、色替えバルブ１０３の切り替えによって、選択された色の塗料を塗装ガン１０１に供給するようにしており、その切り替えの際には、一旦色替えバルブ１０３をシンナーの供給装置側に切り替えて塗装ガン１０１側にシンナーを供給することにより、色替え前の色の塗料を色替えバルブ１０３、ポンプ１０４、供給パイプ１０５および塗装ガン１０１の内部から押し出すと共に、これらの内部を洗浄する。
【０００５】
【発明が解決しようとする課題】
ところで、上記したような回転霧化静電塗装装置にあっては、各塗装色ごとに循環装置を含む供給装置が必要である。このため、従来にあっては、塗装色を増やすために供給装置を増設すれば、その分設置スペースや設備費等が大幅に増大することとなり、逆に、塗装色を増やしたくても供給装置側の設備能力によって塗装色の数が制限されてしまうといった問題があり、このような問題を解決することが課題であった。
【０００６】
【発明の目的】
本発明は、上記従来の課題に着目して成されたものであって、塗装色の増加に対処することができ、しかも、設置スペースの縮小や設備費等の節減を実現することができる回転霧化静電塗装装置を提供することを目的としている。
【０００７】
【課題を解決するための手段】
本発明に係わる回転霧化静電塗装装置は、請求項１として、回転するカップ状の霧化頭の内周面に供給した塗料を遠心力によって霧化する塗装ガンを備えた回転霧化静電塗装装置において、霧化頭の後部に設けられ且つ霧化頭とともに回転する混合室において複数の色の塗料を混合し、その混合塗料を混合室から霧化頭の内周面に供給する構成とし、請求項２として、回転するカップ状の霧化頭の内周面に供給した塗料を遠心力によって霧化する塗装ガンと、塗料の供給量を制御可能な複数の供給装置と、各供給装置から導いた塗料の供給パイプと、霧化頭の後部に設けられ各塗料の供給パイプの吐出先端部が開放し且つ霧化頭とともに回転する混合室とを備えると共に、供給装置から供給された各塗料を混合室において混合し、その混合塗料を混合室から霧化頭の内周面に供給する構成とし、請求項３として、供給装置が、流量制御可能なバルブと、バルブを通過した塗料を圧送するギアポンプを備えている構成としており、上記の構成を課題を解決するための手段としている。
【０００８】
【発明の作用】
本発明の請求項１に係わる回転霧化静電塗装装置では、塗装ガンにおいて、霧化頭の後部に設けられ且つ霧化頭とともに回転する混合室で複数の色の塗料を混合し、その混合塗料を混合室から霧化頭の内周面に供給することにより、霧化頭の回転に伴う遠心力で混合塗料を霧化させる。したがって、例えば、基本的な色の塗料を用意しておき、その混合比を異ならせれば、塗装色を無段階的に変化させ得ることとなる。
【０００９】
本発明の請求項２に係わる回転霧化静電塗装装置では、複数の供給装置に異なる色の塗料が用意してあり、各供給装置から個々の供給パイプを介して各塗料を塗装ガンに供給する。このとき、塗装ガンにおいては、霧化頭の後部に、各塗料の供給パイプの吐出先端部が開放し且つ霧化頭とともに回転する混合室を備えているので、供給パイプの吐出先端部から混合室内に供給された各塗料は霧化頭の高速回転に伴って良好に混合されることとなり、その混合塗料を混合室から霧化頭の内周面に供給することにより、霧化頭の回転に伴う遠心力で混合塗料を霧化させる。したがって、例えば、基本的な色の数に相当する供給装置を設けておき、各供給装置からの塗料の供給量を異ならせれば、これに応じて塗装ガンにおける各塗料の混合比が異なり、塗装色を無段階的に変化させ得ることとなる。
【００１１】
本発明の請求項３に係わる回転霧化静電塗装装置では、塗装色を変える目的で各塗料の混合比を異ならせるために、該当する色の塗料の供給装置において、バルブにより塗料の流量制御を行う。そして、バルブにおいて流量が調整された塗料をギアポンプにより塗装ガン側に圧送し、この際、ギアポンプの回転数を制御することにより塗料の定量供給を行う。
【００１２】
【発明の効果】
本発明の請求項１に係わる回転霧化静電塗装装置によれば、塗装ガンにおいて複数の色の塗料を混合してその混合塗料を霧化することから、基本的な色の塗料を用意しておけばよく、その混合比を異ならせることによって塗装色を無段階的に変化させることができ、しかも、塗装ガンの霧化頭とともに回転する混合室において各塗料を混合することから、圧力損失がきわめて少なく、各塗料を安定した混合比で均一に混合することができ、色味の再現性も向上する。また、塗料の供給装置にあっても、基本的な色に相当する数を設置しておけばよいので、様々な塗装色に応じて供給装置を設置する場合に比べて、設置スペースの縮小、設備費の大幅な節減および管理工数の低減などを実現することができる。さらに、各塗料を混合して用い且つ混合比を異ならせて塗装色を変更することから、塗装色の変更を行う場合に塗装ガンなどを洗浄しなくてもよく、洗浄用のシンナーの供給装置などを廃止することが可能であると共に、塗装色の変更の時間短縮なども図ることができる。
【００１３】
本発明の請求項２に係わる回転霧化静電塗装装置によれば、請求項１と同様に、塗料の基本的な色に相当する数の供給装置を用意しておけばよく、各供給装置からの塗料の供給量を調整することにより、これに応じて塗装ガンにおける各塗料の混合比を異ならせて塗装色を無段階的に変化させることができると共に、塗装ガンの霧化頭とともに回転する混合室において各塗料を混合することから、圧力損失がきわめて少なく、各塗料を安定した混合比で均一に混合することができ、色味の再現性も向上する。また、塗料の供給量で塗装色の色出しを管理し得るので安定した色味が再現可能であり、しかも、様々な塗装色に応じて供給装置を設置する場合に比べて、設置スペースの縮小、設備費の大幅な節減および管理工数の低減などを実現することができる。さらに、各塗料を混合して用い且つ混合比を異ならせて塗装色を変更することから、塗装色の変更を行う場合に塗装ガンなどを洗浄しなくてもよく、洗浄用のシンナーの供給装置などを廃止することが可能であると共に、塗装色の変更の時間短縮なども図ることができる。
【００１５】
本発明の請求項３に係わる回転霧化静電塗装装置によれば、請求項２と同様の効果を得ることができるうえに、バルブにおける塗料の流量制御によって塗料の混合比を容易に変化させることができると共に、ギアポンプの回転数を制御することにより塗料の定量供給を行うことができ、塗料の混合比のさらなる安定化などに貢献することができる。
【００１６】
【実施例】
以下、図面に基づいて、本発明に係わる回転霧化静電塗装装置の一実施例を説明する。
【００１７】
図１（ａ）に示す回転霧化静電塗装装置１は、主として、高速回転するカップ状の霧化頭２ａを備えた塗装ガン２、塗料の供給量が制御可能な複数の供給装置３Ａ〜３Ｃ、各供給装置３Ａ〜３Ｃから導いた塗料の供給パイプ４Ａ〜４Ｃで構成してあり、各供給パイプ４Ａ〜４Ｃの吐出先端部を塗装ガン２における霧化頭２ａの後部に接続している。
【００１８】
塗装ガン２は、図１（ｂ）に示すように、軸線上に中空状の回転軸５を備えており、この回転軸５の先端に霧化頭２ａが固定してある。また、塗装ガン２は、霧化頭２ａの後部に、各塗料の供給パイプ４Ａ〜４Ｃの吐出先端部が開放し且つ霧化頭２ａとともに回転する混合室２ｂを備えている。各供給パイプ４Ａ〜４Ｃは、塗装ガン２の回転軸５の中空部に回転不能な状態で挿入され、各吐出先端部を混合室２ｂに開放させている。なお、混合室２ｂは、例えば直径１０〜２０ｍｍ程度の大きさである。
【００１９】
このほか、塗装ガン２は、塗装粒子に負の高電圧を印荷する電極や、塗料粒子を被塗装物に向けて吹き飛ばすシェーピングエアの噴射手段を備えており、アースされた図外の被塗装物に対向している。
【００２０】
この実施例では３つの供給装置３Ａ〜３Ｃを備えている。したがって、ここで使用される塗料は３色である。各供給装置３Ａ〜３Ｃは、いずれも同じ構成を有するものであって、塗料タンク内から塗料を定量供給するためのポンプ付の循環装置６と、流量制御可能なバルブ７と、バルブ７を通過した塗料を圧送するギアポンプ８を備えており、それぞれのギアポンプ８に各供給パイプ４Ａ〜４Ｃが接続してある。
【００２１】
上記の構成を備えた回転霧化静電塗装装置１は、図１（ｃ）に示すように、各供給装置３Ａ〜３Ｃのバルブ７を同時に開放（ＯＮ）し、且つ各循環装置６および各ギアポンプ８も作動させる。これにより、各供給装置３Ａ〜３Ｃの循環装置６における塗料タンク内の塗料は、バルブ７を通過してギアポンプ８により圧送され、各供給パイプ４Ａ〜４Ｃを介して塗装ガン２の混合室２ｂに供給される。
【００２２】
このとき、塗装ガン２は、霧化頭２ａを２００００〜５００００ｒｐｍで高速回転させており、混合室２ｂも同様に回転している。したがって、各塗料が混合室２ｂにおいて混合され、その混合塗料が混合室２ｂから図示しない吐出孔を経て霧化頭２ａの内周面に供給され、霧化頭２ａの回転に伴う遠心力によって混合塗料が霧化される。これにより、被塗装物は混合色に塗装される。
【００２３】
また、塗装色の変更は、供給装置３Ａ〜３Ｃにおける各バルブ７の制御により塗料の供給量を異ならせ、あるいは選択されたバルブ７を閉塞することにより、混合室２ｂにおける各塗料の混合比を変化させる。このとき、供給装置３Ａ〜３Ｃでは、バルブ７の制御に応じてギアポンプ８の回転数も制御しており、これにより塗料を塗装ガン２側へ定量供給し、混合比が安定するようにしている。
【００２４】
このように、上記実施例の回転霧化静電塗装装置１では、塗装ガン２において塗料を混合して用いることから、基本的な３色の塗料を用意しておけばよく、各塗料の混合比を異ならせることによって塗装色を無段階的に変化させることができる。また、上記の回転霧化静電塗装装置１では、霧化頭２ａとともに回転する混合室２ｂにおいて塗料の混合を行うので、圧力損失がきわめて少なく、各塗料が安定した混合比で均一に混合されることとなり、しかも、混合比の変更（塗装色の変更）もバルブ７による流量制御で簡単に行われる。
【００２５】
なお、上記実施例の回転霧化静電塗装装置１では、３色の塗料を用いた場合を説明したが、色の数は当然それ以外であってもよい。さらに、回転霧化静電塗装装置１では、各塗料を混合して用い且つ混合比を異ならせて塗装色を変更することから、塗装色の変更を行う場合に供給パイプ４Ａ〜４Ｃや塗装ガン２などを洗浄しなくてもよく、これにより洗浄用のシンナーの供給装置などを廃止すると共に、塗装色の変更の時間短縮などを図ることが可能である。
【図面の簡単な説明】
【図１】本発明に係わる回転霧化静電塗装装置の一実施例として装置全体を示す概略説明図（ａ）、霧化頭部分を示す断面説明図（ｂ）および各供給装置におけるバルブの開閉を示すタイムチャート（ｃ）である。
【図２】従来における回転霧化静電塗装装置を示す概略説明図である。
【符号の説明】
１ 回転霧化静電塗装装置
２ 塗装ガン
２ａ 霧化頭
２ｂ 混合室
３Ａ ３Ｂ ３Ｃ 供給装置
４Ａ ４Ｂ ４Ｃ 供給パイプ
７ バルブ
８ ギアポンプ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotary atomizing electrostatic coating apparatus used for, for example, body coating in an automobile manufacturing process.
[0002]
[Prior art]
The rotary atomizing electrostatic coating apparatus has a higher coating efficiency of paint than air atomizing electrostatic coating and the like, and is frequently used for painting a car body. In addition, there is a rotary atomizing electrostatic coating apparatus used for vehicle body coating, which has a function of changing colors in order to cope with a plurality of coating colors, an example of which is shown in FIG.
[0003]
The illustrated rotary atomizing electrostatic coating apparatus 100 includes a coating gun 101 having a cup-shaped atomizing head 101a that rotates at a high speed, a supply device (not shown) for a plurality of colors of paint, and a supply from each supply device. It comprises a color changing valve 103 to which the passages 102a to 102e are connected, a supply pipe 105 connecting the color changing valve 103 and the coating gun 101, and a pump 104 for paint feeding in the middle. The coating gun 101 is provided with an electrode for applying a high negative voltage to the coating particles and a shaping air jetting means for blowing the coating particles toward the object to be coated. are doing. Each supply device is provided with a paint tank and a circulation device with a pump for quantitatively supplying paint to the color change valve 103. The color changing valve 103 is connected to a supply path 102f from a supply device of a cleaning thinner (not shown).
[0004]
The rotary atomizing electrostatic coating apparatus 100 is configured to supply the paint of the selected color to the coating gun 101 by switching the color change valve 103. Is switched to the supply device side of the thinner and the thinner is supplied to the coating gun 101 side, so that the paint of the color before the color change is pushed out from the inside of the color change valve 103, the pump 104, the supply pipe 105 and the coating gun 101, Clean these interiors.
[0005]
[Problems to be solved by the invention]
By the way, in the above-mentioned rotary atomizing electrostatic coating device, a supply device including a circulation device is required for each coating color. For this reason, conventionally, if a supply device is added in order to increase the coating color, the installation space and equipment costs will be greatly increased accordingly, and conversely, even if it is desired to increase the coating color, the supply device is increased. There is a problem that the number of paint colors is limited by the facility capacity of the side, and it has been a problem to solve such a problem.
[0006]
[Object of the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is capable of coping with an increase in paint colors and realizing a reduction in installation space and equipment costs. It is an object of the present invention to provide an atomizing electrostatic coating device.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a rotary atomizing electrostatic coating apparatus including a coating gun configured to atomize paint supplied to an inner peripheral surface of a rotating cup-shaped atomizing head by centrifugal force. In the electrocoating apparatus, a configuration in which a plurality of colors of paint are mixed in a mixing chamber provided behind the atomizing head and rotates with the atomizing head, and the mixed paint is supplied from the mixing chamber to the inner peripheral surface of the atomizing head. According to a second aspect of the present invention, a coating gun for atomizing the paint supplied to the inner peripheral surface of the rotating cup-shaped atomizing head by centrifugal force, a plurality of supply devices capable of controlling the supply amount of the paint, and each supply A supply pipe for the paint guided from the apparatus, and a mixing chamber provided at the rear of the atomizing head, where the discharge tip of each supply pipe for the paint is open and rotates with the atomizing head, is provided from the supply device. Each paint is mixed in a mixing chamber, and the mixed coating Is supplied from the mixing chamber to the inner peripheral surface of the atomization head, and as a third aspect, the supply device includes a valve capable of controlling a flow rate, and a gear pump that pressure-feeds the paint that has passed through the valve. The above configuration is a means for solving the problem.
[0008]
Effect of the Invention
In the rotary atomizing electrostatic coating apparatus according to claim 1 of the present invention, in the coating gun, a plurality of color paints are mixed in a mixing chamber provided at the rear of the atomizing head and rotated with the atomizing head. By supplying the paint from the mixing chamber to the inner peripheral surface of the atomizing head, the mixed paint is atomized by centrifugal force accompanying rotation of the atomizing head. Therefore, for example, if a paint of a basic color is prepared and the mixing ratio is made different, the paint color can be changed steplessly.
[0009]
In the rotary atomizing electrostatic coating device according to the second aspect of the present invention, paints of different colors are prepared in a plurality of supply devices, and each paint is supplied from each supply device to a coating gun through an individual supply pipe. I do. At this time, the paint gun has a mixing chamber at the rear of the atomizing head, in which the discharge tip of each paint supply pipe is open and rotates with the atomization head. Each paint supplied to the room is mixed well with the high-speed rotation of the atomizing head. By supplying the mixed paint to the inner peripheral surface of the atomizing head from the mixing chamber, the rotation of the atomizing head is performed. The mixed paint is atomized by the centrifugal force accompanying the above. Therefore, for example, if a supply device corresponding to the number of basic colors is provided, and the supply amount of the paint from each supply device is changed, the mixing ratio of each paint in the coating gun is changed accordingly, and the coating is performed. The color can be changed steplessly.
[0011]
In the rotary atomizing electrostatic coating apparatus according to the third aspect of the present invention, in order to change the mixing ratio of each paint for the purpose of changing the paint color, in the paint supply apparatus of the corresponding color, the flow rate of the paint is controlled by a valve. I do. Then, the paint whose flow rate has been adjusted in the valve is pressure-fed to the coating gun side by a gear pump, and at this time, the quantitative supply of the paint is performed by controlling the rotation speed of the gear pump.
[0012]
【The invention's effect】
According to the rotary atomizing electrostatic coating apparatus according to the first aspect of the present invention, a paint of a plurality of colors is mixed in a coating gun and the mixed paint is atomized, so that a basic color paint is prepared. By changing the mixing ratio, the coating color can be changed steplessly, and since each paint is mixed in the mixing chamber that rotates with the atomization head of the coating gun, the pressure loss And the paints can be uniformly mixed at a stable mixing ratio, and the color reproducibility is also improved. Also, even in the paint supply device, it is sufficient to install a number corresponding to the basic color, so that compared to the case where the supply device is installed according to various paint colors, the installation space can be reduced, It is possible to realize a significant reduction in equipment costs and a reduction in management man-hours. Furthermore, since the paint colors are changed by mixing the paints and using different mixing ratios, the paint gun does not need to be cleaned when the paint color is changed. Can be eliminated, and the time for changing the paint color can be shortened.
[0013]
According to the rotary atomizing electrostatic coating apparatus according to the second aspect of the present invention, as in the first aspect, it is sufficient to prepare a number of supply apparatuses corresponding to the basic colors of the paint. By adjusting the amount of paint supplied from the paint gun, the paint color can be changed steplessly by varying the mixing ratio of each paint in the paint gun, and rotating with the atomization head of the paint gun. Since the paints are mixed in the mixing chamber, the pressure loss is extremely small, the paints can be uniformly mixed at a stable mixing ratio, and the color reproducibility is improved. In addition, since the coloring of the paint color can be controlled by the supply amount of the paint, a stable color tone can be reproduced, and the installation space is reduced as compared with the case where the supply device is installed according to various paint colors. In addition, it is possible to realize a significant reduction in equipment costs and a reduction in management man-hours. Furthermore, since the paint colors are changed by mixing the paints and using different mixing ratios, the paint gun does not need to be cleaned when the paint color is changed. Can be eliminated, and the time for changing the paint color can be shortened.
[0015]
According to the rotary atomizing electrostatic coating apparatus according to the third aspect of the present invention, the same effect as in the second aspect can be obtained, and the mixing ratio of the paint can be easily changed by controlling the flow rate of the paint in the valve. In addition to controlling the number of revolutions of the gear pump, it is possible to supply a constant amount of the paint, which contributes to further stabilization of the mixture ratio of the paint.
[0016]
【Example】
Hereinafter, an embodiment of a rotary atomizing electrostatic coating apparatus according to the present invention will be described with reference to the drawings.
[0017]
The rotary atomizing electrostatic coating apparatus 1 shown in FIG. 1A mainly includes a coating gun 2 having a cup-shaped atomizing head 2a that rotates at high speed, and a plurality of supply apparatuses 3A to 3A to which the supply amount of paint can be controlled. 3C, is constituted by paint supply pipes 4A to 4C derived from the supply devices 3A to 3C, and the discharge tip of each supply pipe 4A to 4C is connected to the rear part of the atomizing head 2a in the coating gun 2. .
[0018]
As shown in FIG. 1B, the coating gun 2 has a hollow rotary shaft 5 on its axis, and an atomizing head 2a is fixed to the tip of the rotary shaft 5. In addition, the coating gun 2 is provided with a mixing chamber 2b at the rear of the atomizing head 2a, in which the discharge tips of the paint supply pipes 4A to 4C are open and rotate with the atomizing head 2a. The supply pipes 4A to 4C are inserted into the hollow portion of the rotating shaft 5 of the coating gun 2 in a non-rotatable manner, and each discharge tip is opened to the mixing chamber 2b. The mixing chamber 2b has a diameter of, for example, about 10 to 20 mm.
[0019]
In addition, the coating gun 2 is provided with an electrode for applying a high negative voltage to the coating particles and a shaping air jetting means for blowing the coating particles toward the object to be coated. It faces the object.
[0020]
In this embodiment, three supply devices 3A to 3C are provided. Therefore, the paint used here is three colors. Each of the supply devices 3A to 3C has the same configuration, and passes through a circulation device 6 with a pump for quantitatively supplying the paint from the paint tank, a valve 7 capable of controlling a flow rate, and a valve 7 A gear pump 8 for pumping the paint is provided, and each of the gear pumps 8 is connected to each of supply pipes 4A to 4C.
[0021]
As shown in FIG. 1 (c), the rotary atomizing electrostatic coating device 1 having the above configuration simultaneously opens (ON) the valves 7 of the supply devices 3A to 3C, and opens the circulation devices 6 and the respective devices. The gear pump 8 is also operated. Thus, the paint in the paint tank in the circulation device 6 of each of the supply devices 3A to 3C is pumped by the gear pump 8 through the valve 7, and is supplied to the mixing chamber 2b of the coating gun 2 through each of the supply pipes 4A to 4C. Supplied.
[0022]
At this time, the coating gun 2 is rotating the atomizing head 2a at a high speed of 20000 to 50,000 rpm, and the mixing chamber 2b is also rotating. Therefore, each paint is mixed in the mixing chamber 2b, and the mixed paint is supplied from the mixing chamber 2b to the inner peripheral surface of the atomizing head 2a through a discharge hole (not shown), and is mixed by centrifugal force accompanying rotation of the atomizing head 2a. The paint is atomized. As a result, the object is painted in a mixed color.
[0023]
Further, the paint color can be changed by changing the supply amount of the paint by controlling each valve 7 in the supply devices 3A to 3C, or by closing the selected valve 7, thereby changing the mixing ratio of each paint in the mixing chamber 2b. Change. At this time, in the supply devices 3A to 3C, the number of revolutions of the gear pump 8 is also controlled according to the control of the valve 7, whereby the paint is supplied to the coating gun 2 side in a fixed amount so that the mixing ratio is stabilized. .
[0024]
As described above, in the rotary atomizing electrostatic coating apparatus 1 of the above embodiment, since the paint is mixed and used in the coating gun 2, it is sufficient to prepare three basic colors of paint. By changing the ratio, the coating color can be changed steplessly. Further, in the above-described rotary atomizing electrostatic coating apparatus 1, since the paint is mixed in the mixing chamber 2b which rotates together with the atomizing head 2a, the pressure loss is extremely small, and each paint is uniformly mixed at a stable mixing ratio. In addition, the change of the mixture ratio (change of the paint color) can be easily performed by controlling the flow rate by the valve 7.
[0025]
Note that, in the rotary atomizing electrostatic coating apparatus 1 of the above-described embodiment, the case where three colors of paint are used has been described, but the number of colors may naturally be other. Further, in the rotary atomizing electrostatic coating apparatus 1, since the coating colors are changed by mixing and using the respective coating materials and changing the mixing ratio, when the coating color is changed, the supply pipes 4A to 4C and the coating gun are changed. 2 and the like need not be washed, thereby eliminating the use of a thinner supply device for washing and the like and shortening the time for changing the coating color.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing an entire apparatus as an embodiment of a rotary atomizing electrostatic coating apparatus according to the present invention, FIG. It is a time chart (c) which shows opening and closing.
FIG. 2 is a schematic explanatory view showing a conventional rotary atomizing electrostatic coating apparatus.
[Explanation of symbols]
Reference Signs List 1 rotary atomizing electrostatic coating device 2 coating gun 2a atomizing head 2b mixing chamber 3A 3B 3C supply device 4A 4B 4C supply pipe 7 valve 8 gear pump

Claims (3)

回転するカップ状の霧化頭の内周面に供給した塗料を遠心力によって霧化する塗装ガンを備えた回転霧化静電塗装装置において、霧化頭の後部に設けられ且つ霧化頭とともに回転する混合室において複数の色の塗料を混合し、その混合塗料を混合室から霧化頭の内周面に供給することを特徴とする回転霧化静電塗装装置。In a rotary atomizing electrostatic coating apparatus equipped with a coating gun for atomizing paint supplied to the inner peripheral surface of a rotating cup-shaped atomizing head by centrifugal force, provided at the rear of the atomizing head and together with the atomizing head A rotary atomizing electrostatic coating apparatus, wherein a plurality of color paints are mixed in a rotating mixing chamber, and the mixed paint is supplied from the mixing chamber to the inner peripheral surface of the atomizing head. 回転するカップ状の霧化頭の内周面に供給した塗料を遠心力によって霧化する塗装ガンと、塗料の供給量を制御可能な複数の供給装置と、各供給装置から導いた塗料の供給パイプと、霧化頭の後部に設けられ各塗料の供給パイプの吐出先端部が開放し且つ霧化頭とともに回転する混合室とを備えると共に、供給装置から供給された各塗料を混合室において混合し、その混合塗料を混合室から霧化頭の内周面に供給することを特徴とする回転霧化静電塗装装置。A coating gun that atomizes paint supplied to the inner peripheral surface of a rotating cup-shaped atomizing head by centrifugal force, a plurality of supply devices that can control the amount of paint supplied, and a supply of paint guided from each supply device A mixing chamber is provided at the rear of the atomizing head and is provided with a mixing chamber which is open at the discharge tip of each paint supply pipe and rotates together with the atomizing head. A rotary atomizing electrostatic coating apparatus characterized in that the mixed paint is supplied from a mixing chamber to the inner peripheral surface of the atomizing head. 供給装置が、流量制御可能なバルブと、バルブを通過した塗料を圧送するギアポンプを備えていることを特徴とする請求項２に記載の回転霧化静電塗装装置。The rotary atomizing electrostatic coating apparatus according to claim 2, wherein the supply device includes a valve capable of controlling a flow rate, and a gear pump for pumping the paint that has passed through the valve.
JP23812696A 1996-09-09 1996-09-09 Rotary atomizing electrostatic coating equipment Expired - Fee Related JP3541378B2 (en)

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Application Number Priority Date Filing Date Title
JP23812696A JP3541378B2 (en) 1996-09-09 1996-09-09 Rotary atomizing electrostatic coating equipment

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US6291018B1 (en) 1999-11-15 2001-09-18 Ppg Industries Ohio, Inc. Method for applying a composite coating having a polychromatic effect onto a substrate
CA2391388A1 (en) * 1999-11-15 2001-05-25 Vincent P. Dattilo Method and apparatus for applying a polychromatic coating onto a substrate
US6641666B2 (en) 1999-11-15 2003-11-04 Ppg Industries Ohio, Inc. Method and apparatus for coating a substrate
US7445816B2 (en) 1999-11-15 2008-11-04 Ppg Industries Ohio, Inc. Method and apparatus for coating a substrate
US6296706B1 (en) 1999-11-15 2001-10-02 Ppg Industries Ohio, Inc. Method and apparatus for dynamically coating a substrate

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