JP3762888B2 - Electrostatic coating machine and electrostatic coating method - Google Patents

Electrostatic coating machine and electrostatic coating method Download PDF

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Publication number
JP3762888B2
JP3762888B2 JP2001319386A JP2001319386A JP3762888B2 JP 3762888 B2 JP3762888 B2 JP 3762888B2 JP 2001319386 A JP2001319386 A JP 2001319386A JP 2001319386 A JP2001319386 A JP 2001319386A JP 3762888 B2 JP3762888 B2 JP 3762888B2
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air
gun
paint
coating gun
negative
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JP2003117440A (en
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昌彦 甘利
輝夫 安藤
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Asahi Sunac Corp
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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
    • 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

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、静電塗装機及び静電塗装方法に関するものである。
【０００２】
【従来の技術】
静電塗装では、高電圧を印加された塗料が塗装ガンから霧化されつつ被塗物に向けて噴出され、その霧化塗料が、アースされている被塗物に向けて塗着されるようになっている。
【０００３】
【発明が解決しようとする課題】
上記のような静電塗装においては、噴出された霧化塗料の一部が被塗物に塗着せずに塗装ガン側へ跳ね返されることがあり、また、塗装ブースが狭い場合には、霧化塗料の一部が塗装ブースの内壁に当たって塗装ガン側へ跳ね返されることがあるが、跳ね返された霧化塗料は塗装ガンの外面に付着する虞がある。
【０００４】
もし、霧化塗料が塗装ガンの外面に付着すると、その塗料を通じて高電圧電流がリークし、その結果、塗料に印加される電位が低下することになる。
本願発明は上記事情に鑑みて創案され、噴出された霧化塗料が塗装ガンの外面に付着するのを防止することを目的としている。
【０００５】
【課題を解決するための手段】
請求項１の発明は、塗装ガンの前端からマイナス極の高電位に印加された霧化塗料を噴出するようにした静電塗装機であって、前記塗装ガンの外面に沿ったエアの流れを生成するエア生成手段と、前記エア生成手段によって生成される前記エアにマイナス電荷を帯電させる帯電手段とを備えており、前記帯電手段は、前記塗装ガンに前記エアの流路を設けるとともに、塗料をマイナス極の高電位に印加する高電圧発生装置の電極を前記エアの流路に臨むように設け、前記エアを前記電極に接触させることでそのエアにマイナス電荷を帯電させる構成とした。
【０００６】
請求項２の発明は、請求項１の発明において、前記塗装ガンの外面に、前記エアを吐出させる複数のエア吐出口を開口させるとともに、その複数のエア吐出口を包囲するガイド筒を設け、このガイド筒から流出される前記エアによって前記塗装ガンの外面を覆う筒状のエアカーテンが生成される構成とした。
【０００７】
請求項３の発明は、請求項１または請求項２の発明において、前記塗装ガンには、その前端において回転することで前記霧化塗料を遠心力によって放出させる回転霧化頭と、この回転霧化頭を回転駆動するエアタービンとが設けられており、前記エアタービンから排出される空気が前記エアとして前記塗装ガンの外面に沿って流される構成とした。
請求項４の発明は、塗装ガンの前端からマイナス極の高電位に印加された霧化塗料を噴出する静電塗装方法であって、前記塗装ガンに、前記エアの流路を設けるとともに、塗料をマイナス極の高電位に印加する高電圧発生装置の電極を前記エアの流路に臨むように設けた構成とした上で、前記エアを前記電極に接触させることでそのエアにマイナス電荷を帯電させ、マイナス電荷を帯電させた前記エアを、前記塗装ガンの外面に沿って流す構成とした。
【０００８】
請求項５の発明は、請求項４の発明において、前記塗装ガンの外面に、前記エアを吐出させる複数のエア吐出口を開口させるとともに、その複数のエア吐出口を包囲するガイド筒を設けた構成とした上で、前記ガイド筒から流出される前記エアによって前記塗装ガンの外面を覆う筒状のエアカーテンを生成する構成とした。
【０００９】
請求項６の発明は、請求項４または請求項５の発明において、前記塗装ガンに、その前端において回転することで前記霧化塗料を遠心力によって放出させる回転霧化頭と、この回転霧化頭を回転駆動するエアタービンとを設けた構成とした上で、前記エアタービンから排出される空気を前記エアとして前記塗装ガンの外面に沿って流す構成とした。
【００１０】
【発明の作用及び効果】
［請求項１及び請求項４の発明］
マイナス極に印加された霧化塗料が塗装ガンの外面に付着しようとしても、塗装ガンの外面にはマイナス電荷を帯びたエアが流れているので、マイナス極同士の反発によって霧化塗料は塗装ガンの外面に接近することを阻まれる。たとえ霧化塗料が塗装ガンの外面に接近しても、その霧化塗料はエアの流れに乗じて塗装ガンから離れる方向へ吹き飛ばされる。このように本発明によれば、マイナス電荷を帯電させたエアを塗装ガンの外面に沿って流すようにしたので、塗装ガンの外面に霧化塗料が付着するのを防止することができる。
また、塗料をマイナス極の高電位に印加するための高電圧発生装置を、帯電手段として兼用しているので、専用の帯電手段を設けずに済んでいる。
【００１１】
［請求項２及び請求項５の発明］
塗装ガンの外面は筒状のエアカーテンで覆われているので、霧化塗料が塗装ガンの外面に付着するのが確実に防止される。
［請求項３及び請求項６の発明］
回転霧化頭を回転駆動するためのエアタービン用の空気を、塗装ガンの外面に沿って流れるエアとして兼用させているので、専用のエア生成手段を設けずに済んでいる。
【００１２】
【発明の実施の形態】
［実施形態１］
以下、本発明を具体化した実施形態１を図１乃至図６を参照して説明する。
本実施形態の静電塗装機は、塗装ガン１０の前端からマイナス極の高電位に印加された霧化塗料Ｐを噴出するようにしたものであって、塗装ガン１０の外面に沿ったエアＡの流れを生成するエア生成手段１１と、エア生成手段１１によって生成されるエアＡにマイナス電荷を帯電させる帯電手段１２とを備えて構成されている。
【００１３】
塗装ガン１０は、導電性材料からなるとともにアースされた中空のグリップ１３と、このグリップ１３の上端部前面に固着された絶縁性材料からなる銃身１４とからなる。トリガ１５を操作すると、銃身１４内に設けたニードル弁１６が開弁し、銃身１４に圧送された塗料Ｐが導電性の塗料パイプ１７を通って回転霧化頭１８に供給される。塗料パイプ１７には、銃身１４内に収容した高電圧発生装置１９の前端部のピン状をなす電極１９ａが接触しており、塗料Ｐは、ニードル弁１６を通過した直後に塗料パイプ１７内でマイナス極の高電圧に印加される。一方、回転霧化頭１８は、塗装ガン１０の前端部に配されていて、エアタービン２０によって高速で回転駆動される。そして、高電圧を印加された状態で回転霧化頭１８に供給された塗料Ｐは、回転霧化頭１８の遠心力により塗装ガン１０の前端から放出されるとともに、霧化用エア噴出口２１から噴出される霧化用エアによって霧化状態とされ、この放出された霧化塗料Ｐは、アースされている被塗物（図示せず）に塗着される。
【００１４】
このとき、霧化塗料Ｐの一部は、被塗物に当たってもそこに塗着せずに跳ね返り、塗装ガン１０に向かって戻って来ることがある。また、塗装ブース（図示せず）が狭い場合には、被塗物の脇をすり抜けて塗装ブースの内壁に当たった霧化塗料Ｐの一部が、塗装ガン１０側へ跳ね返って来ることがある。このような場合、戻ってきた霧化塗料Ｐの一部が塗装ガン１０の銃身１４の外面に付着し、その付着した塗料Ｐを通して高電圧電流がリークし、その結果、塗料Ｐに印加される電位が低下する虞がある。そのため、本実施形態では、塗料Ｐが塗装ガン１０の外面に付着するのを防止する手段が講じられている。以下、その手段について説明する。
【００１５】
塗装ガン１０の内部には、塗装ガン１０の外面に霧化塗料Ｐが付着するのを防止するための付着防止用エアＡ（以下、単に「エア」という）の流路が設けられている。このエアＡの流路は、グリップ１３の下端面から上端部に至るパイプ状の第１流路２２Ａ、第１流路２２Ａから前方に向けてグリップ１３の上端部前端面に臨むように設けた穿孔状の第２流路２２Ｂ、銃身１４の後端部に組み付けた前後方向に長いパイプ状の第３流路２２Ｃ、第３流路２２Ｃの前端部と連通するように銃身１４内に形成したリング状の第４流路２２Ｄ、第４流路２２Ｄから前方のエアタービン２０に向かって屈曲した経路に形成された第５流路２２Ｅ、エアタービン２０を囲むリング状の第６流路２２Ｆ、第６流路２２Ｆからエアタービン２０に向けて径方向内向きにエアを噴出する孔状をなす複数の第７流路２２Ｇ、エアタービン２０が収容されているリング状の空間からなる第８流路２２Ｈ、第８流路２２Ｈから後方に向かって延びるように形成された第９流路２２Ｉ、第９流路２２Ｉの後端に連通するようにリング状に形成された第１０流路２２Ｊ、第１０流路２２Ｊから後方へ延びるように形成された第１１流路２２Ｋ、第１１流路２２Ｋの後端に連通する空間からなるともに第３流路２２Ｃを構成するパイプ、ニードル弁１６及び高電圧発生装置１９を貫通させた第１２流路２２Ｌとから構成されている。グリップ１３の下端部にコンプレッサ（図示せず）によって圧送されたエアＡは、第１〜第１２の各流路２２Ａ〜２２Ｌを順に通って流れる。
【００１６】
また、銃身１４の後端部には、第１２流路２２Ｌに連通するとともに銃身１４の外面に開口するエア吐出口２３が、周方向に間隔を空けて複数形成されている。同じく、銃身１４の後端部には、その複数のエア吐出口２３を包囲する形態のガイド筒２４が形成されている。ガイド筒２４は、銃身１４とほぼ同心状であって全周に渡って連続した円筒形をなしており、換言すると、銃身１４の外面とガイド筒２４との間には、エア吐出口２３に連通するとともに全周に亘って連続した形態の円筒状空間２５が構成されている。また、この円筒状空間２５の後端部は、ガイド筒２４を銃身１４に支持するための支持部２６により全周に亘って塞がれており、したがって、円筒状空間２５は前方のみに開放されていることになる。このエア吐出口２３とガイド筒２４は、塗装ガン１０の外面に沿ったエアＡの流れを生成するためのエア生成手段１１として機能する。
【００１７】
尚、ガイド筒２４の後端部（エア吐出口２３よりも後方の位置）には、円筒状空間２５をガイド筒２４の外面に開口させる逃がし孔２７が形成されており、シンナーによって塗装ガン１０の外面を洗浄したときに、円筒状空間２５内に入り込んだシンナーが逃がし孔２７を通して外部へ排出されるようになっている。
また、エアＡの流路２２Ａ〜２２Ｌのうち、リング状の第４流路２２Ｄには、上記した塗料Ｐをマイナス極の高電位に印加するための高電圧発生装置１９の電極１９ａの基端部が臨んでいる。したがって、エアＡの流路２２Ａ〜２２Ｌを流れたエアＡは、第４流路２２Ｄにおいて電極１９ａに接触することにより、マイナス電荷を帯びることになる。即ち、高電圧発生装置１９は、エアＡにマイナス電荷を帯電させるための帯電手段１２として機能するのである。
【００１８】
次に、上記構成になる本実施形態の静電塗装機を用いた静電塗装方法について説明する。
グリップ１３に圧送されたエアＡは、第１〜第１２の各流路２２Ａ〜２２Ｌを順に通った後に、エア吐出口２３から円筒状空間２５内に圧送され、その前端のリング状の開口から塗装ガン１０の銃身１４の外面に沿って前方へ流れる。このとき、円筒状空間２５の前端の開口は全周に亘って連続したリング状をなしているので、銃身１４の外面に沿ったエアＡの流れは、全周に亘って連続した筒状のエアカーテンを構成する。そして、このエアカーテンにより銃身１４の外面は全周に亘って包囲される。尚、図６においては、エアＡの流れを便宜上「線」で表しているが、エアＡは筒状の層流状となる。
【００１９】
塗装ガン１０の内部を流れるエアＡは、第４流路２２Ｄにおいて高電圧発生装置１９の電極１９ａに接触することによってマイナス電荷を帯び、その後、第５〜第１２流路２２Ｅ〜２２Ｌ、エア吐出口２３及び円筒状空間２５を通過する間もマイナス電荷を帯びた状態に保たれる。したがって、銃身１４の外面に沿って流れるエアＡ（エアカーテン）もマイナス電荷を帯びた状態に保たれている。
このように銃身１４（塗装ガン１０）の外面にマイナス電荷を帯びたエアＡが流れている状態では、銃身１４の外面にマイナス極に印加されている霧化塗料Ｐが接近しても、マイナス極同士の反発によって霧化塗料Ｐは塗装ガン１０の外面に接近することを阻まれ、塗装ガン１０から遠ざかる。たとえ霧化塗料Ｐが塗装ガン１０の外面に接近してエアＡ（エアカーテン）の中に突入しても、その霧化塗料Ｐは、銃身１４の外面に付着することなく、エアＡの流れに乗じて塗装ガン１０の前方へ吹き飛ばされる。このように本実施形態においては、マイナス電荷を帯電させたエアＡを塗装ガン１０の外面に沿って流すようにしたので、塗装ガン１０の外面に霧化塗料Ｐが付着するのを防止することができる。
【００２０】
また、銃身１４の外面に沿って流れるエアＡは、筒状のエアカーテンを構成して銃身１４を全周に亘って包囲しているので、霧化塗料Ｐが塗装ガン１０の外面に付着するのを確実に防止することができる。
また、塗料Ｐをマイナス極の高電位に印加するための高電圧発生装置１９を、帯電手段１２として兼用させているので、専用の帯電手段を設けずに済んでいる。
また、銃身１４（塗装ガン１０）の外面に霧化塗料Ｐが付着するのを防止するためのエアＡは、その流路２２Ａ〜２２Ｌの途中で第７流路２２Ｇから第８流路２２Ｈ内のエアタービン２０に向かって噴出することによりそのエアタービン２０を高速で回転駆動させるための駆動力となり、その後、第９流路２２Ｉ〜第１２流路２２Ｌ、エア吐出口２３及び円筒状空間２５を経る経路、即ちエアタービン２０の排出経路を通って塗装ガン１０の外部に至るようになっている。つまり、本実施形態では、回転霧化頭１８を回転駆動するためのエアタービン２０用の排出空気を、塗装ガン１０の外面に沿って流れるエアＡとして兼用させているので、専用のエア生成手段を設けずに済んでいる。
【００２１】
［他の実施形態］
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施態様も本発明の技術的範囲に含まれ、さらに、下記以外にも要旨を逸脱しない範囲内で種々変更して実施することができる。
（１）上記実施形態ではエアが塗装ガンの前方に向かって流れるようにしたが、本発明によれば、エアを塗装ガンの後方に向かって流してもよい。
【００２２】
（２）上記実施形態ではエアが筒状のエアカーテンを構成するようにしたが、本発明によれば、エアが複数本の筋状に分かれて流れるようにしてもよい。
（３）上記実施形態では作業者が手で掴んで操作するハンドガンに適用した例について説明したが、本発明は、自動ガンにも適用することができる。
【００２３】
（４）上記実施形態ではエアの流路を塗装ガンの内部に設け、その流路内のエアを塗装ガンの外面側へ吐出させるようにしたが、本発明によれば、塗装ガンの外部にエアの流路を設けてもよい。
（５）上記実施形態では回転霧化頭を回転駆動するためのエアタービン用の空気を、塗装ガンの外面に沿って流れるエアとして兼用させたが、本発明によれば、エアタービン用の空気とは別に、塗装ガンの外面への霧化塗料の付着を防止する専用のエアを塗装ガンに供給してもよい。
【００２４】
（６）上記実施形態ではエアタービンによって回転駆動される回転霧化頭を有する塗装ガンに適用した例を説明したが、本発明は、回転霧化頭を有しない塗装ガンにも適用することができる。
（７）上記実施形態では塗装ガンの内部でエアにマイナス電荷を帯電させたが、本発明によれば、塗装ガンの外部でエアにマイナス電荷を帯電させるようにしてもよい。
【図面の簡単な説明】
【図１】実施形態１の縦断面図
【図２】銃身部分の拡大縦断面図
【図３】銃身部分の拡大水平断面図
【図４】エアの流路をあらわす図２の部分拡大図
【図５】エアの流路をあらわす図３の部分拡大図
【図６】エアの流れによって霧化塗料の付着が防止されている様子をあらわす斜視図
【符号の説明】
１０…塗装ガン
１１…エア生成手段
１２…帯電手段
１８…回転霧化頭
１９…高電圧発生装置
１９ａ…電極 ２３…エア吐出口
２０…エアタービン
２２Ａ〜２２Ｌ…エアの流路
２４…ガイド筒
Ａ…エア
Ｐ…霧化塗料[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electrostatic coating machine and an electrostatic coating method.
[0002]
[Prior art]
In electrostatic coating, paint applied with a high voltage is sprayed from the coating gun toward the work piece while being atomized, and the atomized paint is applied to the grounded work piece. It has become.
[0003]
[Problems to be solved by the invention]
In the electrostatic coating as described above, a part of the sprayed atomized paint may be bounced back to the painting gun side without being applied to the object to be coated. A part of the paint may hit the inner wall of the painting booth and be bounced back to the painting gun side, but the boiled atomized paint may adhere to the outer surface of the painting gun.
[0004]
If the atomized paint adheres to the outer surface of the paint gun, a high voltage current leaks through the paint, resulting in a decrease in the potential applied to the paint.
The present invention has been made in view of the above circumstances, and aims to prevent the sprayed atomized paint from adhering to the outer surface of the coating gun.
[0005]
[Means for Solving the Problems]
The invention of claim 1 is an electrostatic coating machine in which an atomized paint applied at a negative potential is ejected from the front end of the coating gun, and the flow of air along the outer surface of the coating gun is reduced. an air generation unit to be generated, said provided with a charging means for charging a negative charge to the air generated by the air generating means, said charging means, provided with a flow path of the air to the spray gun, paint An electrode of a high voltage generator that applies a negative potential to a high potential is provided so as to face the air flow path, and the air is brought into contact with the electrode to charge the air with a negative charge .
[0006]
The invention of claim 2 is the invention of claim 1, wherein a plurality of air discharge ports for discharging the air are opened on the outer surface of the coating gun, and a guide cylinder surrounding the plurality of air discharge ports is provided. A cylindrical air curtain that covers the outer surface of the coating gun is generated by the air flowing out from the guide cylinder.
[0007]
According to a third aspect of the present invention , in the first or second aspect of the present invention , the coating gun has a rotary atomizing head that rotates at its front end to release the atomized paint by centrifugal force, and the rotating fog. An air turbine that rotationally drives the chemical head is provided, and the air discharged from the air turbine flows as the air along the outer surface of the coating gun.
According to a fourth aspect of the present invention, there is provided an electrostatic coating method for ejecting an atomized paint applied at a negative potential from a front end of a coating gun, wherein the coating gun is provided with the air passage, The electrode of a high voltage generator that applies a high potential to the negative electrode is provided so as to face the air flow path, and the air is brought into contact with the electrode to charge the air with a negative charge. is, the air that is charged with negative charge, has a configuration to flow along the outer surface of the coating gun.
[0008]
According to a fifth aspect of the present invention , in the fourth aspect of the invention , a plurality of air discharge ports for discharging the air are opened on the outer surface of the coating gun, and a guide cylinder surrounding the plurality of air discharge ports is provided. After the configuration, a cylindrical air curtain that covers the outer surface of the coating gun is generated by the air flowing out from the guide cylinder.
[0009]
According to a sixth aspect of the present invention, there is provided the rotary atomizing head according to the fourth or fifth aspect , wherein the coating gun is rotated at the front end thereof to release the atomized paint by centrifugal force, and the rotary atomization. An air turbine that rotationally drives the head is provided, and air discharged from the air turbine flows as the air along the outer surface of the coating gun.
[0010]
[Action and effect of the invention]
[Invention of Claims 1 and 4 ]
Even if the atomized paint applied to the negative electrode tries to adhere to the outer surface of the paint gun, negatively charged air flows on the outer surface of the paint gun. Is prevented from approaching the outside of the. Even if the atomized paint approaches the outer surface of the paint gun, the atomized paint is blown away in the direction away from the paint gun by taking advantage of the air flow. Thus, according to the present invention, air charged with negative charges is caused to flow along the outer surface of the coating gun, so that it is possible to prevent the atomized paint from adhering to the outer surface of the coating gun.
Moreover, since the high voltage generator for applying the paint to the high potential of the negative electrode is also used as the charging means, it is not necessary to provide a dedicated charging means.
[0011]
[Invention of Claims 2 and 5 ]
Since the outer surface of the paint gun is covered with a cylindrical air curtain, the atomized paint is reliably prevented from adhering to the outer surface of the paint gun.
[Invention of Claim 3 and Claim 6 ]
Since the air for air turbine for rotating the rotary atomizing head is also used as the air flowing along the outer surface of the coating gun, there is no need to provide a dedicated air generating means.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[Embodiment 1]
A first embodiment of the present invention will be described below with reference to FIGS.
The electrostatic coating machine of the present embodiment is configured to eject the atomized paint P applied at a negative potential from the front end of the coating gun 10, and air A along the outer surface of the coating gun 10. The air generating means 11 for generating the flow of the air and the charging means 12 for charging the air A generated by the air generating means 11 with a negative charge are configured.
[0013]
The coating gun 10 includes a hollow grip 13 made of a conductive material and grounded, and a barrel 14 made of an insulating material fixed to the front surface of the upper end portion of the grip 13. When the trigger 15 is operated, the needle valve 16 provided in the barrel 14 is opened, and the paint P pressure-fed to the barrel 14 is supplied to the rotary atomizing head 18 through the conductive paint pipe 17. The paint pipe 17 is in contact with a pin-shaped electrode 19 a at the front end of the high voltage generator 19 accommodated in the barrel 14, and the paint P immediately passes through the needle valve 16 in the paint pipe 17. Applied to the negative pole high voltage. On the other hand, the rotary atomizing head 18 is disposed at the front end of the coating gun 10 and is driven to rotate at high speed by the air turbine 20. The paint P supplied to the rotary atomizing head 18 in a state where a high voltage is applied is discharged from the front end of the coating gun 10 by the centrifugal force of the rotary atomizing head 18, and the atomizing air jet 21. The atomized air is sprayed from the atomized air, and the discharged atomized paint P is applied to a grounded object (not shown).
[0014]
At this time, a part of the atomized paint P may bounce back without being applied to the object to be coated, and may return toward the paint gun 10. In addition, when the painting booth (not shown) is narrow, a part of the atomized paint P that has passed through the side of the object and hit the inner wall of the painting booth may bounce back to the painting gun 10 side. . In such a case, a part of the returned atomized paint P adheres to the outer surface of the barrel 14 of the paint gun 10, and a high voltage current leaks through the attached paint P, so that it is applied to the paint P. There is a risk that the potential may decrease. Therefore, in the present embodiment, means for preventing the paint P from adhering to the outer surface of the paint gun 10 is taken. The means will be described below.
[0015]
Inside the coating gun 10, a flow path for adhesion preventing air A (hereinafter simply referred to as “air”) for preventing the atomized paint P from adhering to the outer surface of the coating gun 10 is provided. The flow path of the air A is provided so as to face the front end surface of the upper end portion of the grip 13 from the lower end surface of the grip 13 to the pipe-shaped first flow channel 22A and from the first flow channel 22A to the front. A perforated second flow path 22B, a pipe-shaped third flow path 22C attached to the rear end of the barrel 14 and a front end of the third flow path 22C are formed in the barrel 14 so as to communicate with the front end. A ring-shaped fourth flow path 22D, a fifth flow path 22E formed in a path bent from the fourth flow path 22D toward the front air turbine 20, a ring-shaped sixth flow path 22F surrounding the air turbine 20, An eighth flow comprising a plurality of seventh flow passages 22G having a hole shape for injecting air radially inward from the sixth flow passage 22F toward the air turbine 20, and a ring-shaped space in which the air turbine 20 is accommodated. Rear from path 22H, eighth flow path 22H The ninth channel 22I formed so as to extend, the tenth channel 22J formed in a ring shape so as to communicate with the rear end of the ninth channel 22I, and formed so as to extend rearward from the tenth channel 22J. The eleventh flow path 22K, a space communicating with the rear end of the eleventh flow path 22K, and the pipe constituting the third flow path 22C, the needle valve 16 and the high voltage generator 19 are passed through the twelfth flow path. 22L. The air A pumped to the lower end portion of the grip 13 by a compressor (not shown) flows through the first to twelfth flow paths 22A to 22L in order.
[0016]
In addition, a plurality of air discharge ports 23 communicating with the twelfth flow path 22L and opening on the outer surface of the barrel 14 are formed at the rear end portion of the barrel 14 at intervals in the circumferential direction. Similarly, a guide tube 24 is formed at the rear end of the barrel 14 so as to surround the plurality of air discharge ports 23. The guide cylinder 24 is substantially concentric with the barrel 14 and has a continuous cylindrical shape over the entire circumference. In other words, the air discharge port 23 is provided between the outer surface of the barrel 14 and the guide cylinder 24. A cylindrical space 25 is formed which communicates and is continuous over the entire circumference. Further, the rear end portion of the cylindrical space 25 is closed over the entire circumference by a support portion 26 for supporting the guide tube 24 to the barrel 14, and therefore the cylindrical space 25 is opened only forward. Will be. The air discharge port 23 and the guide cylinder 24 function as air generating means 11 for generating a flow of air A along the outer surface of the coating gun 10.
[0017]
An escape hole 27 that opens the cylindrical space 25 to the outer surface of the guide cylinder 24 is formed at the rear end of the guide cylinder 24 (a position behind the air discharge port 23). When the outer surface is cleaned, the thinner that has entered the cylindrical space 25 is discharged to the outside through the escape hole 27.
Of the air A channels 22A to 22L, the ring-shaped fourth channel 22D has a base end of the electrode 19a of the high-voltage generator 19 for applying the coating P to a negative high potential. The department is facing. Therefore, the air A that has flowed through the flow paths 22A to 22L of the air A is negatively charged by contacting the electrode 19a in the fourth flow path 22D. That is, the high voltage generator 19 functions as the charging means 12 for charging the air A with a negative charge.
[0018]
Next, an electrostatic coating method using the electrostatic coating machine according to the present embodiment configured as described above will be described.
The air A that is pumped to the grip 13 passes through the first to twelfth flow paths 22A to 22L in order, and is then pumped from the air discharge port 23 into the cylindrical space 25, and from the ring-shaped opening at the front end thereof. It flows forward along the outer surface of the barrel 14 of the painting gun 10. At this time, since the opening at the front end of the cylindrical space 25 forms a ring shape continuous over the entire circumference, the flow of the air A along the outer surface of the barrel 14 is a cylindrical shape continuous over the entire circumference. Configure the air curtain. The air curtain surrounds the outer surface of the barrel 14 over the entire circumference. In FIG. 6, the flow of the air A is indicated by “lines” for convenience, but the air A is in a cylindrical laminar flow.
[0019]
The air A flowing inside the coating gun 10 is negatively charged by coming into contact with the electrode 19a of the high voltage generator 19 in the fourth flow path 22D, and then the fifth to twelfth flow paths 22E to 22L and the air discharge While passing through the outlet 23 and the cylindrical space 25, a negative charge is maintained. Therefore, the air A (air curtain) flowing along the outer surface of the barrel 14 is also kept negatively charged.
Thus, in the state where the negatively charged air A flows on the outer surface of the barrel 14 (painting gun 10), even if the atomized paint P applied to the negative pole approaches the outer surface of the barrel 14, it is minus. Due to the repulsion between the poles, the atomized paint P is prevented from approaching the outer surface of the paint gun 10 and moves away from the paint gun 10. Even if the atomized paint P approaches the outer surface of the coating gun 10 and enters the air A (air curtain), the atomized paint P does not adhere to the outer surface of the barrel 14 and the flow of air A And is blown off to the front of the paint gun 10. As described above, in the present embodiment, since the air A charged with a negative charge is caused to flow along the outer surface of the coating gun 10, it is possible to prevent the atomized paint P from adhering to the outer surface of the coating gun 10. Can do.
[0020]
Further, since the air A flowing along the outer surface of the barrel 14 forms a cylindrical air curtain and surrounds the barrel 14 over the entire circumference, the atomized paint P adheres to the outer surface of the coating gun 10. Can be surely prevented.
Further, since the high voltage generator 19 for applying the coating material P to the high potential of the negative pole is also used as the charging means 12, it is not necessary to provide a dedicated charging means.
Further, the air A for preventing the atomized paint P from adhering to the outer surface of the barrel 14 (the coating gun 10) flows from the seventh flow path 22G to the eighth flow path 22H in the middle of the flow paths 22A to 22L. By ejecting the air turbine 20 toward the air turbine 20, the air turbine 20 is driven to rotate at a high speed, and then the ninth flow path 22 </ b> I to 12th flow path 22 </ b> L, the air discharge port 23, and the cylindrical space 25. It goes to the outside of the coating gun 10 through a path passing through, that is, a discharge path of the air turbine 20. That is, in the present embodiment, the exhaust air for the air turbine 20 for rotationally driving the rotary atomizing head 18 is also used as the air A flowing along the outer surface of the coating gun 10, so that the dedicated air generating means It is not necessary to set up.
[0021]
[Other Embodiments]
The present invention is not limited to the embodiment described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above embodiment, air flows toward the front of the coating gun. However, according to the present invention, air may flow toward the rear of the coating gun.
[0022]
(2) In the above embodiment, the air forms a cylindrical air curtain. However, according to the present invention, the air may flow in a plurality of streaks.
(3) In the above-described embodiment, an example in which the operator is applied to a hand gun that is grasped and operated by a hand has been described.
[0023]
(4) In the above embodiment, the air flow path is provided inside the painting gun, and the air in the flow path is discharged to the outer surface side of the painting gun. An air flow path may be provided.
(5) In the above embodiment, the air turbine air for rotationally driving the rotary atomizing head is also used as the air flowing along the outer surface of the coating gun. However, according to the present invention, the air turbine air is used. Separately, a dedicated air for preventing the atomized paint from adhering to the outer surface of the paint gun may be supplied to the paint gun.
[0024]
(6) In the above embodiment, an example in which the present invention is applied to a coating gun having a rotary atomizing head that is rotationally driven by an air turbine has been described. However, the present invention can also be applied to a coating gun that does not have a rotary atomizing head. it can.
(7) In the above embodiment, negative charge is charged to air inside the coating gun. However, according to the present invention, negative charge may be charged to air outside the coating gun.
[Brief description of the drawings]
1 is a longitudinal sectional view of Embodiment 1. FIG. 2 is an enlarged longitudinal sectional view of a barrel part. FIG. 3 is an enlarged horizontal sectional view of a barrel part. FIG. 4 is a partially enlarged view of FIG. FIG. 5 is a partially enlarged view of FIG. 3 showing an air flow path. FIG. 6 is a perspective view showing a state in which the atomized paint is prevented from adhering by the air flow.
DESCRIPTION OF SYMBOLS 10 ... Paint gun 11 ... Air generation means 12 ... Charging means 18 ... Rotary atomization head 19 ... High voltage generator 19a ... Electrode 23 ... Air discharge port 20 ... Air turbine 22A-22L ... Air flow path 24 ... Guide cylinder A ... Air P ... Atomized paint

Claims (6)

塗装ガンの前端からマイナス極の高電位に印加された霧化塗料を噴出するようにした静電塗装機であって、
前記塗装ガンの外面に沿ったエアの流れを生成するエア生成手段と、
前記エア生成手段によって生成される前記エアにマイナス電荷を帯電させる帯電手段とを備えており、
前記帯電手段は、
前記塗装ガンに前記エアの流路を設けるとともに、塗料をマイナス極の高電位に印加する高電圧発生装置の電極を前記エアの流路に臨むように設け、前記エアを前記電極に接触させることでそのエアにマイナス電荷を帯電させる構成となっていることを特徴とする静電塗装機。An electrostatic coating machine that sprays atomized paint applied from a front end of a coating gun to a negative negative high potential,
Air generating means for generating an air flow along an outer surface of the paint gun;
Charging means for charging the air generated by the air generating means with a negative charge ,
The charging means includes
The paint gun is provided with the air flow path, and an electrode of a high voltage generator for applying paint to a negative high potential is provided so as to face the air flow path, and the air is brought into contact with the electrode. The electrostatic coating machine is characterized in that the air is charged with a negative charge . 前記塗装ガンの外面に、前記エアを吐出させる複数のエア吐出口を開口させるとともに、その複数のエア吐出口を包囲するガイド筒を設け、このガイド筒から流出される前記エアによって前記塗装ガンの外面を覆う筒状のエアカーテンが生成されるようにしたことを特徴とする請求項１記載の静電塗装機。  A plurality of air discharge ports for discharging the air are opened on the outer surface of the coating gun, and a guide cylinder is provided to surround the plurality of air discharge ports. The electrostatic coating machine according to claim 1, wherein a cylindrical air curtain covering the outer surface is generated. 前記塗装ガンには、その前端において回転することで前記霧化塗料を遠心力によって放出させる回転霧化頭と、この回転霧化頭を回転駆動するエアタービンとが設けられており、
前記エアタービンから排出される空気が前記エアとして前記塗装ガンの外面に沿って流される構成としたことを特徴とする請求項１または請求項２に記載の静電塗装機。The coating gun is provided with a rotary atomizing head that rotates at its front end to release the atomized paint by centrifugal force, and an air turbine that rotationally drives the rotary atomizing head,
The electrostatic coating machine according to claim 1 or 2, wherein the air discharged from the air turbine is configured to flow as the air along an outer surface of the coating gun. 塗装ガンの前端からマイナス極の高電位に印加された霧化塗料を噴出する静電塗装方法であって、
前記塗装ガンに、前記エアの流路を設けるとともに、塗料をマイナス極の高電位に印加する高電圧発生装置の電極を前記エアの流路に臨むように設けた構成とした上で、
前記エアを前記電極に接触させることでそのエアにマイナス電荷を帯電させ、
マイナス電荷を帯電させた前記エアを、前記塗装ガンの外面に沿って流すことを特徴とする静電塗装方法。An electrostatic coating method that ejects atomized paint applied from a front end of a coating gun to a negative negative high potential,
The coating gun is provided with a flow path for the air, and an electrode of a high voltage generator for applying a paint to a negative negative high potential is provided so as to face the air flow path.
By contacting the air with the electrode, the air is charged with a negative charge,
An electrostatic coating method, wherein the air charged with a negative charge is caused to flow along an outer surface of the coating gun. 前記塗装ガンの外面に、前記エアを吐出させる複数のエア吐出口を開口させるとともに、その複数のエア吐出口を包囲するガイド筒を設けた構成とした上で、
前記ガイド筒から流出される前記エアによって前記塗装ガンの外面を覆う筒状のエアカーテンを生成することを特徴とする請求項４記載の静電塗装方法。On the outer surface of the coating gun, a plurality of air discharge ports for discharging the air are opened, and a guide cylinder surrounding the plurality of air discharge ports is provided.
The electrostatic coating method according to claim 4 , wherein a cylindrical air curtain that covers an outer surface of the coating gun is generated by the air flowing out from the guide cylinder. 前記塗装ガンに、その前端において回転することで前記霧化塗料を遠心力によって放出させる回転霧化頭と、この回転霧化頭を回転駆動するエアタービンとを設けた構成とした上で、
前記エアタービンから排出される空気を前記エアとして前記塗装ガンの外面に沿って流すことを特徴とする請求項４または請求項５に記載の静電塗装方法。On the coating gun, a rotational atomizing head that releases the atomized paint by centrifugal force by rotating at the front end thereof, and an air turbine that rotationally drives the rotary atomizing head are provided.
6. The electrostatic coating method according to claim 4 , wherein air discharged from the air turbine is caused to flow along the outer surface of the coating gun as the air.
JP2001319386A 2001-10-17 2001-10-17 Electrostatic coating machine and electrostatic coating method Expired - Fee Related JP3762888B2 (en)

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