JPH08187453A - Rotary atomizing head type coating device - Google Patents
Rotary atomizing head type coating deviceInfo
- Publication number
- JPH08187453A JPH08187453A JP6340260A JP34026094A JPH08187453A JP H08187453 A JPH08187453 A JP H08187453A JP 6340260 A JP6340260 A JP 6340260A JP 34026094 A JP34026094 A JP 34026094A JP H08187453 A JPH08187453 A JP H08187453A
- Authority
- JP
- Japan
- Prior art keywords
- atomizing head
- ring
- high voltage
- rotary atomizing
- semiconductive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
- B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
-
- 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
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば車体、家電製
品、家具製品等の被塗物を塗装するのに用いて好適な回
転霧化頭型塗装装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing head type coating apparatus suitable for coating an object to be coated such as a car body, home electric appliances and furniture products.
【０００２】[0002]
【従来の技術】一般に知られている直接帯電方式の回転
霧化頭型塗装装置は、回転軸を介して回転霧化頭に高電
圧を印加し、該回転霧化頭から放出される塗料粒子を帯
電させて、アースに接続された被塗物に向けて塗料を飛
行させ、該被塗物に塗着させるようになっている。2. Description of the Related Art A generally known direct-charging rotary atomizing head type coating apparatus applies a high voltage to a rotary atomizing head through a rotary shaft to release paint particles from the rotary atomizing head. Is electrified, the coating material is made to fly toward the article to be coated which is connected to the ground, and is applied to the article to be coated.
【０００３】ここで、従来技術による直接帯電方式の回
転霧化頭型塗装装置は、安全性確保のために、回転霧化
頭と被塗物との間に過電流が流れたことを検出する過電
流検出手段を備えたものが知られており、このような形
式の回転霧化頭型静電塗装装置を図９および図１０を参
照しつつ説明する。[0003] Here, the rotary atomizing head type coating apparatus of the direct charging type according to the prior art detects that an overcurrent flows between the rotary atomizing head and the object to be coated in order to ensure safety. A device provided with an overcurrent detecting means is known, and a rotary atomizing head type electrostatic coating device of this type will be described with reference to FIGS. 9 and 10.
【０００４】図中、１は塗装ブースを示し、該塗装ブー
ス１内にはコンベア２が敷設され、該コンベア２上には
アースに接続された被塗物３が載置されている。そし
て、該被塗物３はコンベア２によって塗装ブース１内を
搬送され、この間に塗装作業が行われる。In the drawing, reference numeral 1 denotes a coating booth, a conveyor 2 is laid in the coating booth 1, and an object 3 to be coated which is grounded is placed on the conveyor 2. Then, the article to be coated 3 is conveyed by the conveyor 2 in the coating booth 1, during which the coating work is performed.
【０００５】４は内部に金属製の回転軸を回転駆動する
エアモータ（図示せず）を内蔵した直接帯電方式の塗装
機本体を示し、該塗装機本体４の先端側に位置した回転
軸には回転霧化頭５が取付けられ、また塗装機本体４は
塗料パイプ６を介して色替弁装置７と接続されている。
そして、該色替弁装置７は図示しない塗料タンク、エア
源、シンナ源等と接続され、塗料タンクからの塗料を塗
料パイプ６を介して塗装機本体４から回転霧化頭５に供
給し、色替等の必要に応じてシンナ、エアを供給して洗
浄を行うようになっている。Reference numeral 4 denotes a main body of a direct charging type coating machine having a built-in air motor (not shown) for rotationally driving a metal rotary shaft, and the rotary shaft located at the tip end side of the main body 4 of the coating machine. A rotary atomizing head 5 is attached, and the painter body 4 is connected to a color changing valve device 7 via a paint pipe 6.
The color changing valve device 7 is connected to a paint tank, an air source, a thinner source, etc., which are not shown, and supplies the paint from the paint tank to the rotary atomizing head 5 from the painter main body 4 via the paint pipe 6. When necessary, such as color change, thinner and air are supplied for cleaning.
【０００６】ここで、前記回転霧化頭５は例えばアルミ
ニウム材等の金属によってベル型に形成され、後述する
高電圧ケーブル１０および回転軸を介して高電圧が印加
される。このように、回転霧化頭５はエアモータによっ
て高速回転され、かつ高電圧ケーブル１０を介して高電
圧が印加された状態において、塗料パイプ６を介して塗
料が供給されると、回転霧化頭５からは高電圧に帯電し
た帯電塗料粒子が噴霧される。Here, the rotary atomizing head 5 is formed in a bell shape from a metal such as an aluminum material, and a high voltage is applied thereto via a high voltage cable 10 and a rotary shaft which will be described later. In this way, when the rotary atomizing head 5 is rotated at a high speed by the air motor and the high voltage is applied through the high voltage cable 10, when the paint is supplied through the paint pipe 6, the rotary atomizing head 5 is rotated. From 5, the charged paint particles charged to a high voltage are sprayed.
【０００７】８は商用電源９から出力される電圧を例え
ば−６０〜−１２０ｋＶ程度の高電圧まで昇圧する高電
圧発生手段としての高電圧発生装置、１０は該高電圧発
生装置８から発生した高電圧を塗装機本体４を介して回
転霧化頭５に印加する高電圧ケーブルをそれぞれ示し、
該高電圧ケーブル１０の一端は高電圧発生装置８に接続
され、その他端は塗装機本体４に接続されている。Reference numeral 8 is a high voltage generator as a high voltage generator for boosting the voltage output from the commercial power source 9 to a high voltage of, for example, about -60 to -120 kV, and 10 is a high voltage generated by the high voltage generator 8. High-voltage cables for applying voltage to the rotary atomizing head 5 via the coating machine main body 4 are shown respectively,
One end of the high voltage cable 10 is connected to the high voltage generator 8, and the other end is connected to the coating machine main body 4.
【０００８】１１は過電流検出器を示し、該過電流検出
器１１は高電圧ケーブル１０を介して回転霧化頭５に流
れる過電流を検出するものである。Reference numeral 11 denotes an overcurrent detector, which detects an overcurrent flowing through the rotary atomizing head 5 via the high voltage cable 10.
【０００９】１２は高電圧発生装置８と商用電源９との
間に設けられた遮断スイッチを示し、該遮断スイッチ１
２は過電流検出器１１で高電圧ケーブル１０を流れる電
流が所定電流値以上になったことを検知したとき開成す
るものである。Reference numeral 12 denotes a cutoff switch provided between the high voltage generator 8 and the commercial power source 9, and the cutoff switch 1
2 is opened when the overcurrent detector 11 detects that the current flowing through the high-voltage cable 10 has exceeded a predetermined current value.
【００１０】このように構成される従来技術による回転
霧化頭型静電塗装装置では、高電圧発生装置８で発生し
た高電圧が高電圧ケーブル１０等を介して塗装機本体４
から回転霧化頭５に印加される。一方、塗料タンクから
の塗料を色替弁装置７、塗料パイプ６を介して回転霧化
頭５に供給することにより、該塗料を印加高電圧と同電
位に帯電せしめ、該回転霧化頭５から塗料を吐出させる
ことにより、該回転霧化頭５とアース電位にある被塗物
３との間の静電界の力をかりて塗着せしめる。この間、
高電圧発生装置８、高電圧ケーブル１０、回転霧化頭
５、被塗物３、アースによって電気的なループが形成さ
れ、該ループを電流が流れる。In the rotary atomizing head type electrostatic coating apparatus according to the prior art constructed as described above, the high voltage generated by the high voltage generator 8 is applied through the high voltage cable 10 or the like to the main body 4 of the coating machine.
Is applied to the rotary atomizing head 5. On the other hand, by supplying the paint from the paint tank to the rotary atomizing head 5 via the color changing valve device 7 and the paint pipe 6, the paint is charged to the same potential as the applied high voltage, and the rotary atomizing head 5 is charged. By discharging the paint from the above, the electrostatic atomizing force between the rotary atomizing head 5 and the object to be coated 3 at the ground potential is applied to apply. During this time,
An electric loop is formed by the high voltage generator 8, the high voltage cable 10, the rotary atomizing head 5, the object to be coated 3, and the ground, and an electric current flows through the loop.
【００１１】さらに、塗装機本体４の回転霧化頭５と被
塗物３との間には帯電塗料粒子が静電界の力をかりて吸
引飛行しているが、この間に介在する空気によって所定
の電気抵抗Ｒが形成され、この空気による電気抵抗Ｒに
よって、塗装機本体４を構成する部品の個々の浮遊容量
Ｃ（これらの全容量は数１０ｐＦ位と考えられる）に対
して蓄えられた電荷が放電するのを防止している。Further, between the rotary atomizing head 5 of the main body 4 of the coating machine and the object 3 to be coated, charged paint particles are attracted and fly by the force of the electrostatic field. Electric resistance R is formed, and due to the electric resistance R due to this air, the electric charge stored with respect to each stray capacitance C (the total capacitance thereof is considered to be about several tens pF) of the components constituting the coating machine main body 4. Are prevented from discharging.
【００１２】しかし、図１０に示すように、塗装中に回
転霧化頭５が被塗物３に異常接近または接触する短絡事
故等が発生した場合には、回転霧化頭５と被塗物３との
間の電気抵抗値Ｒが小さくなり、各部品の浮遊容量Ｃに
蓄えられた電荷が被塗物３に向けて瞬時に放電しようと
する。However, as shown in FIG. 10, when a short circuit accident occurs in which the rotary atomizing head 5 comes close to or comes into contact with the article 3 to be coated during coating, the rotary atomizing head 5 and the article to be coated are contacted. The electric resistance value R between the parts 3 and 3 becomes small, and the electric charge stored in the stray capacitance C of each part tends to be discharged toward the object 3 to be coated in an instant.
【００１３】なお、通常時に高電圧発生装置８から流れ
る電流は約５０μＡであるが、浮遊容量に蓄えられた電
荷が瞬時に放電、スパークを発生するときには、そのエ
ネルギは１０００ミリジュールにも達する。The current flowing from the high voltage generator 8 is usually about 50 μA, but when the electric charge stored in the stray capacitance is instantly discharged and sparks, its energy reaches 1000 millijoules.
【００１４】しかし、前記ループを流れる電流は過電流
検出器１１によって検出されており、このループに過電
流が流れると、遮断スイッチ１２を開成し、高電圧発生
装置８への電流供給を停止する。これによって、塗装機
本体４と被塗物３との異常接近または接触による短絡事
故、高電圧ケーブル損傷等による短絡事故を防止し、塗
料着火による火災発生を防止している。However, the current flowing through the loop is detected by the overcurrent detector 11, and when the overcurrent flows in this loop, the breaking switch 12 is opened to stop the current supply to the high voltage generator 8. . This prevents a short circuit accident due to abnormal proximity or contact between the coating machine main body 4 and the object to be coated 3, a short circuit accident due to damage to the high-voltage cable, etc., and prevents a fire from igniting the paint.
【００１５】[0015]
【発明が解決しようとする課題】ところで、上述した従
来技術による回転霧化頭型静電塗装装置では、回転霧化
頭５と被塗物３とが異常接近したときに、この間に存在
する空気による電気抵抗値Ｒが小さくなって過電流検出
器１１に設定値以上の電流が流れることにより、遮断ス
イッチ１２を開成させるものであるが、該遮断スイッチ
１２が作動しなかったり、作動遅れが発生した場合に
は、回転霧化頭５と被塗物３との間に火花放電が発生
し、この火花放電によって火災事故を起すという虞れが
ある。By the way, in the rotary atomizing head type electrostatic coating apparatus according to the above-mentioned prior art, when the rotary atomizing head 5 and the object to be coated 3 are abnormally close to each other, the air present therebetween is present. The electric resistance value R due to becomes small and the current exceeding the set value flows in the overcurrent detector 11, so that the breaking switch 12 is opened. However, the breaking switch 12 does not operate or an operation delay occurs. In such a case, spark discharge may occur between the rotary atomizing head 5 and the object to be coated 3, and this spark discharge may cause a fire accident.
【００１６】特に、従来技術による回転霧化頭５はアル
ミニウム材等の金属によってベル型またはディスク型に
形成されているから、電気抵抗値Ｒが小さくなって一度
スパークが発生すると浮遊容量Ｃに蓄えられた電荷の殆
どが瞬時に放電されてしまい、エネルギの殆どが瞬時に
放電されてしまうため、その放電エネルギは瞬時に大き
くなり、有機溶剤（シンナ）の最小着火点以下に抑える
のが非常に困難であった。Particularly, since the rotary atomizing head 5 according to the prior art is formed in a bell shape or a disk shape with a metal such as an aluminum material, when the electric resistance value R becomes small and a spark occurs once, it is stored in the stray capacitance C. Most of the generated charge is instantly discharged, and most of the energy is instantly discharged, so the discharge energy increases instantly and it is very difficult to keep it below the minimum ignition point of the organic solvent (thinner). Met.
【００１７】本発明は、上述した従来技術の問題に鑑み
なされたもので、回転霧化頭と被塗物との間に発生する
瞬間的な放電エネルギを小さく抑えることにより、安全
性を高めることのできる回転霧化頭型塗装装置を提供す
ることを目的としている。The present invention has been made in view of the above-mentioned problems of the prior art, and enhances safety by suppressing the instantaneous discharge energy generated between the rotary atomizing head and the object to be coated to be small. It is an object of the present invention to provide a rotary atomizing head type coating device that can be used.
【００１８】[0018]
【課題を解決するための手段】上述した課題を解決する
ために、請求項１の発明が採用する回転霧化頭型塗装装
置は、絶縁樹脂材料からなり、内部に回転軸を回転駆動
するエアモータが設けられたハウジングと、絶縁樹脂材
料によって先端が塗料放出端縁となったカップ状または
ディスク状に形成され、該ハウジングの先端側に位置し
た回転軸に設けられた回転霧化頭と、該回転霧化頭の外
周面を囲むように円環状に形成され、基端が前記ハウジ
ングに設けられると共に先端が該回転霧化頭の塗料放出
端縁近傍に位置する環状体と、半導電性材料または導電
性材料によって形成され、該環状体の先端に設けられた
リング電極と、該リング電極に高電圧発生手段からの高
電圧を印加するため、前記環状体の周面に設けられた半
導電性材料からなる環状体側半導電性膜とから構成した
ことにある。In order to solve the above-mentioned problems, a rotary atomizing head type coating device adopted by the invention of claim 1 is made of an insulating resin material, and an air motor for driving a rotary shaft to rotate therein. A housing provided with, a rotary atomizing head provided on a rotary shaft located on the tip side of the housing, the tip being formed into a cup shape or a disk shape whose tip is a paint discharge edge by an insulating resin material, An annular body formed in an annular shape so as to surround the outer peripheral surface of the rotary atomizing head, the base end of which is provided in the housing and the tip of which is located in the vicinity of the paint discharge edge of the rotary atomizing head; and a semiconductive material. Alternatively, a ring electrode formed of a conductive material and provided at the tip of the ring-shaped body, and a semi-conductive layer provided on the peripheral surface of the ring-shaped body for applying a high voltage from the high-voltage generating means to the ring electrode. Made from a natural material Lies in the configuration of the annular side semiconducting film.
【００１９】請求項２の発明では、前記回転霧化頭の塗
料放出端縁外周には半導電性材料からなる霧化頭側半導
電性膜を形成したことにある。According to the second aspect of the invention, the atomizing head side semi-conductive film made of a semi-conductive material is formed on the outer periphery of the paint discharge edge of the rotary atomizing head.
【００２０】請求項３の発明では、前記ハウジングの周
面には、高電圧発生手段から環状体側半導電性膜に高電
圧を印加するために半導電性材料からなる半導電性通電
膜を形成したことにある。In the invention of claim 3, a semiconductive conducting film made of a semiconductive material is formed on the peripheral surface of the housing in order to apply a high voltage from the high voltage generating means to the annular body side semiconductive film. There is something I did.
【００２１】請求項４の発明では、前記ハウジングに
は、高電圧発生手段から環状体側半導電性膜に高電圧を
印加するためのリード線を設け、該リード線の途中には
高抵抗素子を設けたことにある。According to the invention of claim 4, a lead wire for applying a high voltage from the high voltage generating means to the annular body side semi-conductive film is provided in the housing, and a high resistance element is provided in the middle of the lead wire. It is provided.
【００２２】請求項５の発明では、前記リング電極は、
前記環状体の先端側表面に皮膜状に形成したことにあ
る。In the invention of claim 5, the ring electrode is
The film is formed on the tip side surface of the annular body.
【００２３】請求項６の発明では、前記環状体は塗料噴
霧パターンを成形するためのシェーピングエアを噴出す
るシェーピングエアリングとし、前記リング電極を該シ
ェーピングエアリングの先端に設けたことにある。In the invention of claim 6, the annular body is a shaping air ring for ejecting shaping air for forming a paint spray pattern, and the ring electrode is provided at the tip of the shaping air ring.
【００２４】[0024]
【作用】請求項１の発明の構成のように、回転霧化頭を
絶縁樹脂材料によって形成すると共に、同じく絶縁樹脂
材料によって環状体を形成し、該環状体の周面には先端
のリング電極に高電圧発生手段からの高電圧を印加する
ための環状体側半導電性膜を形成したから、塗装装置を
構成する部品の浮遊容量を、環状体の周面に形成した環
状体側半導電性膜の各部分における抵抗で環状体の周面
に分布される分布容量とすることができ、それぞれの抵
抗毎に分布容量が接続されたＬ型回路を環状体の周面に
複数個形成することになる。これにより、回転霧化頭と
被塗物とが異常接近したとしても、環状体の先端側に形
成されたリング電極側の位置にあるＬ型回路中の分布容
量から蓄えられた電荷を順次放電していくから、浮遊容
量に蓄えられた電荷が瞬時に放電するのを抑え、放電エ
ネルギを低くすることができる。しかも、浮遊容量は複
数の分布容量を並列に分割して接続しているから、各分
布容量における静電容量は小さくなり、放電時における
静電エネルギを小さく抑えることができ、さらに環状体
側半導電性膜による各抵抗と分布容量からＬ型回路をな
すために、該Ｌ型回路の放電時には時定数によって電荷
の放電速度を遅らせることができ、分布容量から放電さ
れる電流値を低く抑えることができる。According to the first aspect of the present invention, the rotary atomizing head is formed of an insulating resin material, and an annular body is also formed of the insulating resin material. The ring electrode at the tip is formed on the peripheral surface of the annular body. Since the annular body side semi-conductive film for applying the high voltage from the high voltage generating means is formed on the annular body side semi-conductive film formed on the peripheral surface of the annular body, the stray capacitance of the components constituting the coating apparatus is formed. The distributed capacitance distributed on the circumferential surface of the annular body can be obtained by the resistance in each part of the above, and a plurality of L-shaped circuits to which the distributed capacitance is connected for each resistance are formed on the circumferential surface of the annular body. Become. As a result, even if the rotary atomizing head and the object to be coated become abnormally close to each other, the charge accumulated from the distributed capacitance in the L-shaped circuit at the position on the ring electrode side formed on the tip side of the annular body is sequentially discharged. Therefore, it is possible to suppress the electric charge accumulated in the stray capacitance from being instantaneously discharged and reduce the discharge energy. Moreover, since the stray capacitance is formed by dividing and connecting a plurality of distributed capacitances in parallel, the electrostatic capacitance at each distributed capacitance becomes small, and the electrostatic energy at the time of discharge can be suppressed to a small level. Since the L-type circuit is made up of the respective resistances and the distributed capacitance by the conductive film, the discharge rate of the electric charge can be delayed by the time constant when the L-type circuit is discharged, and the current value discharged from the distributed capacitance can be suppressed to a low value. it can.
【００２５】請求項２の発明では、前記回転霧化頭の塗
料放出端縁外周に霧化頭側半導電性膜を形成したから、
環状体の先端に位置したリング電極に印加された高電圧
は該環状体側半導電性膜にも給電され、回転霧化頭の塗
料放出端縁から放出される塗料粒子を直接帯電させるこ
とができる。According to the second aspect of the invention, since the atomizing head side semi-conductive film is formed on the outer periphery of the paint discharge edge of the rotary atomizing head,
The high voltage applied to the ring electrode located at the tip of the annular body is also fed to the semiconductive film on the annular body side, so that the paint particles discharged from the paint discharge edge of the rotary atomizing head can be directly charged. .
【００２６】請求項３の発明では、ハウジングの周面に
半導電性通電膜を形成したから、リング電極へは半導電
性通電膜および環状体側半導電性膜を介して高電圧発生
手段からの高電圧を供給し、被塗物に塗装機が異常接近
したときには、前記半導電性通電膜は給電側に位置する
高電圧発生手段、高圧ケーブル等の浮遊容量に蓄えられ
た電荷が瞬時に放電するのを防止する抵抗となり、半導
電性通電膜によって給電側の浮遊容量に蓄えられた電荷
が瞬時に放電するのを防止できる。According to the third aspect of the invention, since the semiconductive conducting film is formed on the circumferential surface of the housing, the high voltage generating means is provided to the ring electrode via the semiconductive conducting film and the annular body side semiconductive film. When a high voltage is supplied and the coating machine approaches the object to be coated abnormally, the semiconductive conducting film is instantly discharged from the electric charge stored in the stray capacitance of the high voltage generating means, high voltage cable, etc. located on the power feeding side. It becomes a resistance to prevent the electric charge, and the semiconductive conductive film can prevent the electric charge accumulated in the stray capacitance on the power feeding side from being instantaneously discharged.
【００２７】請求項４の発明では、ハウジングに高抵抗
素子を設け、リング電極へはこの高抵抗素子、環状体側
半導電性膜を介して高電圧を印加するから、前記高抵抗
素子によって給電側に位置する高電圧発生手段、高圧ケ
ーブル等の浮遊容量に蓄えられた電荷が瞬時に放電する
のを抑えることができる。According to the invention of claim 4, a high resistance element is provided in the housing, and a high voltage is applied to the ring electrode through the high resistance element and the semiconductive film on the annular body side. It is possible to suppress instantaneous discharge of the electric charge stored in the stray capacitance of the high voltage generating means, the high voltage cable, etc. located at.
【００２８】請求項５の発明では、リング電極を環状体
の先端側表面に半導電性材料を皮膜状に形成したから、
当該リング電極を容易に形成することができる。In the invention of claim 5, the ring electrode is formed on the tip side surface of the annular body with a semiconductive material in the form of a film.
The ring electrode can be easily formed.
【００２９】請求項６の発明では、前記環状体をシェー
ピングエアリングとし、前記リング電極を該シェーピン
グエアリングの先端に設けたから、当該シェーピングエ
アリングを利用してリング電極を形成することができ
る。In the invention of claim 6, since the annular body is a shaping air ring and the ring electrode is provided at the tip of the shaping air ring, the ring electrode can be formed by utilizing the shaping air ring.
【００３０】[0030]
【実施例】以下、本発明の実施例を図１ないし図８に基
づいて説明する。なお、実施例では、前述した従来技術
と同一の構成要素に同一の符号を付し、その説明を省略
するものとする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiments, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.
【００３１】まず、図１ないし図３に本発明の第１の実
施例を示す。First, FIGS. 1 to 3 show a first embodiment of the present invention.
【００３２】図中、２１は本実施例による静電塗装機、
２２は該静電塗装機２１のハウジングをそれぞれ示し、
該ハウジング２２は絶縁性樹脂材料（例えば、ポリエチ
レンテレフタレート（ＰＥＴ），ポリアセタール（ＰＯ
Ｍ），ポリアミド（ＰＡ），ポリエチレン（ＰＥ），ポ
リプロピレン（ＰＰ）等）によって有底筒状に形成さ
れ、その基部２２Ａの外周から軸方向に伸長した筒部２
２Ｂ内が後述するエアモータ２４を収容するモータ収容
部２２Ｃとなっている。また、筒部２２Ｂの先端側内周
には雌ねじ部２２Ｄが形成されている。In the figure, 21 is an electrostatic coating machine according to this embodiment,
Reference numerals 22 denote housings of the electrostatic coating machine 21,
The housing 22 is made of an insulating resin material (for example, polyethylene terephthalate (PET), polyacetal (PO)).
M), polyamide (PA), polyethylene (PE), polypropylene (PP), etc., is formed into a bottomed tubular shape and extends axially from the outer circumference of the base portion 22A.
Inside 2B is a motor housing portion 22C that houses an air motor 24, which will be described later. Further, a female screw portion 22D is formed on the inner circumference of the distal end side of the tubular portion 22B.
【００３３】２３はハウジング２２のモータ収容部２２
Ｃ内周面に設けられた半導電性通電膜を示し、該半導電
性通電膜２３は筒部２２Ｂ内面および雌ねじ部２２Ｄを
覆うように塗布手段等によって成膜されている。また、
該半導電性通電膜２３は、例えば、導電性繊維を混練し
たポリエステル，エポキシ，フッ素樹脂等によって形成
されている。そして、該半導電性通電膜２３の基端側２
３Ａはエアモータ２４のモータケース２４Ａと電気的に
接続され、先端側２３Ｂは雌ねじ部２２Ｄの内周面にね
じ状に成膜されている。Reference numeral 23 denotes a motor housing portion 22 of the housing 22.
The semiconductive conducting film provided on the inner peripheral surface of C is shown. The semiconductive conducting film 23 is formed by a coating means or the like so as to cover the inner surface of the cylindrical portion 22B and the internal thread portion 22D. Also,
The semiconductive conducting film 23 is formed of, for example, polyester, epoxy, fluororesin, or the like in which conductive fibers are kneaded. Then, the base end side 2 of the semiconductive conducting film 23
3A is electrically connected to the motor case 24A of the air motor 24, and the tip side 23B is formed in a screw shape on the inner peripheral surface of the female screw portion 22D.
【００３４】２４はハウジング２２のモータ収容部２２
Ｃに取付けられたタービン型のエアモータを示し、該エ
アモータ２４は導電性金属材料から筒状に形成されたモ
ータケース２４Ａと、後述する回転軸２８を回転自在に
支持するエア軸受２４Ｂ，２４Ｂと、前記モータケース
２４Ａの基端側に位置して回転軸２８の外周に固着され
たエアタービン２４Ｃとから構成されている。Reference numeral 24 denotes a motor housing portion 22 of the housing 22.
A turbine type air motor attached to C is shown. The air motor 24 is a motor case 24A formed of a conductive metal material in a cylindrical shape, and air bearings 24B and 24B rotatably supporting a rotating shaft 28 described later. It is composed of an air turbine 24C located on the base end side of the motor case 24A and fixed to the outer periphery of the rotary shaft 28.
【００３５】また、２５はエアモータ２４の先端側外周
に設けられた固定リングで、該固定リング２５には、軸
方向に貫通するエア孔２５Ａ，２５Ａが周方向に複数個
（２個のみ図示）形成されている。また、該固定リング
２５は、ハウジング２２の雌ねじ部２２Ｄに螺着される
ことにより、内周側でモータケース２４Ａをハウジング
２２内に固定すると共に、該エアモータ２４の外周側に
メインエアチャンバ２６を画成している。なお、該メイ
ンエアチャンバ２６にはエア通路２７を介してシェーピ
ングエアが供給されるようになっている。A fixing ring 25 is provided on the outer periphery of the tip end side of the air motor 24. The fixing ring 25 has a plurality of air holes 25A, 25A penetrating in the axial direction in the circumferential direction (only two are shown). Has been formed. Further, the fixing ring 25 is screwed to the female screw portion 22D of the housing 22 to fix the motor case 24A inside the housing 22 on the inner peripheral side, and the main air chamber 26 on the outer peripheral side of the air motor 24. Defined. Shaping air is supplied to the main air chamber 26 through an air passage 27.
【００３６】２８はエアモータ２４のモータケース２４
Ａ内に軸方向に挿通された中空筒状の回転軸を示し、該
回転軸２８は、その基端側がエアタービン２４Ｃに固着
され、先端側がモータケース２４Ａ外に突出している。
そして、該回転軸２８はエアタービン２４Ｃによって高
速で回転駆動されるものである。28 is a motor case 24 of the air motor 24
A hollow cylindrical rotary shaft inserted axially in A is shown. The rotary shaft 28 has a base end side fixed to the air turbine 24C and a front end side protruding outside the motor case 24A.
The rotary shaft 28 is rotationally driven at high speed by the air turbine 24C.
【００３７】２９はエアモータ２４外でかつシェーピン
グエアリング３２より径方向内側に位置して回転軸２８
の先端側に固着され、絶縁性樹脂材料（例えば、ポリエ
ーテルスルホン（ＰＥＳ），ポリフェニレンサルファイ
ド（ＰＰＳ），ポリエーテルイミド（ＰＥＩ），ポリエ
ーテルエーテルケトン（ＰＥＥＫ）等）によって形成さ
れたベル型（カップ状）の回転霧化頭で、該回転霧化頭
２９は基端側が回転軸２８に取付けられ、先端側が漸次
拡開する朝顔状に形成されている。また、該回転霧化頭
２９の内周側には、図２に示すように、軸方向中間部に
位置して絶縁性樹脂材料からなる後部ハブ部材３０が装
着され、該後部ハブ部材３０から前方は塗料展延平滑面
２９Ａとなり、該塗料展延平滑面２９Ａの外周端は、当
該塗料展延平滑面２９Ａによって拡散した塗料を噴霧す
る塗料放出端縁２９Ｂとなっている。Reference numeral 29 denotes a rotary shaft 28 located outside the air motor 24 and radially inward of the shaping air ring 32.
Which is fixed to the tip side of the and is formed of an insulating resin material (for example, polyethersulfone (PES), polyphenylene sulfide (PPS), polyetherimide (PEI), polyetheretherketone (PEEK), etc.) ( The cup-shaped rotary atomizing head 29 is formed in a morning glory shape in which the proximal end side of the rotary atomizing head 29 is attached to the rotary shaft 28 and the distal end side gradually expands. As shown in FIG. 2, on the inner peripheral side of the rotary atomizing head 29, a rear hub member 30 made of an insulating resin material is mounted at an intermediate portion in the axial direction. The front side is a paint spread smooth surface 29A, and the outer peripheral end of the paint spread smooth surface 29A is a paint discharge edge 29B for spraying the paint diffused by the paint spread smooth surface 29A.
【００３８】３１は後部ハブ部材３０の前方に位置して
回転霧化頭２９に螺着して設けられ、該回転霧化頭２
９、後部ハブ部材３０と共に絶縁性樹脂材料によって形
成されたハブ部材を示し、該ハブ部材３１の外周側に
は、後述のフィードチューブ３８から吐出される塗料や
シンナ等の洗浄溶剤を塗料放出端縁２９Ｂ側に導くため
の第１のハブ孔３１Ａ，３１Ａが多数穿設され（２個の
み図示）、中央部には前面側に洗浄溶剤を供給するため
の第２のハブ孔３１Ｂ，３１Ｂ（２個のみ図示）が穿設
されている。Reference numeral 31 is located in front of the rear hub member 30 and is provided by being screwed onto the rotary atomizing head 29.
9, a hub member formed of an insulating resin material together with the rear hub member 30 is shown. On the outer peripheral side of the hub member 31, a paint solvent or a cleaning solvent such as thinner discharged from a feed tube 38, which will be described later, is discharged. A large number of first hub holes 31A, 31A for guiding to the edge 29B side are provided (only two are shown), and second hub holes 31B, 31B (for supplying the cleaning solvent to the front surface side are provided in the central portion). Only two are shown).
【００３９】３２はハウジング２２の筒部２２Ｂ先端に
設けられた環状体としてのシェーピングエアリングを示
し、該シェーピングエアリング３２は、後述する外側リ
ング３３、内側リング３４、サブエアチャンバ３５から
大略構成されている。Reference numeral 32 denotes a shaping air ring as an annular body provided at the tip of the cylindrical portion 22B of the housing 22, and the shaping air ring 32 is composed of an outer ring 33, an inner ring 34 and a sub air chamber 35 which will be described later. Has been done.
【００４０】３３は絶縁性樹脂材料によって筒状に形成
された外側リングを示し、該外側リング３３は、その基
端側外周がハウジング２２の雌ねじ部２２Ｄに螺着され
る雄ねじ部３３Ａとなり、先端側が漸次縮径するように
形成されている。また、該外側リング３３の先端には、
回転霧化頭２９の塗料放出端縁２９Ｂに向けて伸長する
環状の電極形成突起３３Ｂが一体に形成され、該電極形
成突起３３Ｂの基端側には塗料放出端縁２９Ｂ側に向け
てシェーピングエアを噴出するエア噴出孔３３Ｃ，３３
Ｃが複数個穿設されている。Reference numeral 33 denotes a cylindrical outer ring made of an insulating resin material. The outer periphery of the outer ring 33 at the base end side is a male screw portion 33A screwed to the female screw portion 22D of the housing 22, and the distal end is formed. The side is formed so that the diameter is gradually reduced. Further, at the tip of the outer ring 33,
An annular electrode forming projection 33B extending toward the paint discharging edge 29B of the rotary atomizing head 29 is integrally formed, and a shaping air is formed on the base end side of the electrode forming projection 33B toward the paint discharging edge 29B. Air ejection holes 33C, 33 for ejecting air
A plurality of Cs are drilled.
【００４１】３４は外側リング３３内に螺着され、絶縁
性樹脂材料から段付筒状に形成された内側リングで、該
内側リング３４は、外側リング３３との間にサブエアチ
ャンバ３５を画成している。また、該内側リング３４の
基端側には、メインエアチャンバ２６と前記サブエアチ
ャンバ３５とを連通する連通孔３４Ａ，３４Ａが形成さ
れている。Reference numeral 34 denotes an inner ring which is screwed into the outer ring 33 and is formed of an insulating resin material in a stepped cylindrical shape. The inner ring 34 defines a sub air chamber 35 between itself and the outer ring 33. Is made. Further, communication holes 34A, 34A for communicating the main air chamber 26 and the sub air chamber 35 are formed on the base end side of the inner ring 34.
【００４２】３６は外側リング３３の外周面に設けられ
た環状体側半導電性膜としてのリング側半導電性膜を示
し、該リング側半導電性膜３６は、雄ねじ部３３Ａから
電極形成突起３３Ｂ側までを覆うように塗布手段等によ
って成膜されている。また、該リング側半導電性膜３６
は、前述した半導電性通電膜２３と同様に、例えば、導
電性繊維を混練したポリエステル，エポキシ，フッ素樹
脂等によって形成されている。そして、該リング側半導
電性膜３６の基端側３６Ａは雄ねじ部３３Ａの外周側に
ねじ状に成膜されて半導電性通電膜２３の先端側２３Ｂ
と電気的に接続され、先端側３６Ｂは電極形成突起３３
Ｂに延在している。Reference numeral 36 denotes a ring-side semiconductive film as an annular body-side semiconductive film provided on the outer peripheral surface of the outer ring 33. The ring-side semiconductive film 36 extends from the male screw portion 33A to the electrode forming projection 33B. A film is formed by a coating means or the like so as to cover up to the side. In addition, the ring-side semiconductive film 36
Like the above-mentioned semiconductive conducting film 23, is formed of, for example, polyester, epoxy, fluororesin, or the like in which conductive fibers are kneaded. The proximal side 36A of the ring-side semiconductive film 36 is formed in a screw shape on the outer peripheral side of the male screw portion 33A, and the distal side 23B of the semiconductive conductive film 23 is formed.
And the tip side 36B is electrically connected to the electrode forming protrusion 33.
It extends to B.
【００４３】ここで、前記半導電性通電膜２３とリング
側半導電性膜３６の厚さは、エアモータ２４のモータケ
ース２４Ａからリング電極３７までの合計抵抗値が１０
7〜１０9 Ωの範囲、例えば、高電圧が６０ｋＶ以下の
ときには１０7 〜１０8 Ωとなるように設定され、６０
ｋＶ以上のときには１０8 〜１０9 Ωとなるように設定
される。Here, the thicknesses of the semiconductive conducting film 23 and the ring side semiconductive film 36 are such that the total resistance value from the motor case 24A of the air motor 24 to the ring electrode 37 is 10.
It is set in the range of 7 to 10 9 Ω, for example, 10 7 to 10 8 Ω when the high voltage is 60 kV or less.
It is set to be 10 8 to 10 9 Ω when kV or higher.
【００４４】３７は外側リング３３の電極形成突起３３
Ｂ外周に位置してリング側半導電性膜３６の先端側３６
Ｂに一体に設けられたリング電極を示し、該リング電極
３７は、半導電性通電膜２３とリング側半導電性膜３６
と同様に、例えば、導電性繊維を混練したポリエステ
ル，エポキシ，フッ素樹脂等によって形成されている。
そして、該リング電極３７は、半導電性通電膜２３とリ
ング側半導電性膜３６を介して給電される−６０〜−１
２０ｋＶ程度の高電圧を放電し、回転霧化頭２９の塗料
放出端縁２９Ｂから噴霧された塗料を帯電させるもので
ある。37 is an electrode forming protrusion 33 of the outer ring 33.
Located on the outer periphery of B, the tip side 36 of the ring-side semiconductive film 36
B shows a ring electrode provided integrally with the ring electrode 37. The ring electrode 37 includes a semiconductive conducting film 23 and a ring side semiconductive film 36.
Similarly to the above, for example, it is formed of polyester, epoxy, fluororesin, or the like in which conductive fibers are kneaded.
Then, the ring electrode 37 is fed with power through the semiconductive conducting film 23 and the ring side semiconductive film 36 -60 to -1.
A high voltage of about 20 kV is discharged to charge the paint sprayed from the paint discharge edge 29B of the rotary atomizing head 29.
【００４５】一方、３８は回転軸２８内に同軸に設けら
れたフィードチューブを示し、該フィードチューブ３８
は外筒３９と内筒４０とから２重チューブ構造となり、
該内筒４０の途中には、後述する塗料弁４３の弁体４３
Ｃが離，着座する弁座４０Ａが一体に固着されている。On the other hand, reference numeral 38 denotes a feed tube coaxially provided in the rotary shaft 28.
Has a double tube structure from the outer cylinder 39 and the inner cylinder 40,
A valve body 43 of a paint valve 43 described later is provided in the middle of the inner cylinder 40.
A valve seat 40A on which C separates and sits is integrally fixed.
【００４６】４１は内筒４０内に形成された塗料通路
で、該塗料通路４１はその基端側が塗料パイプ６を介し
て色替弁装置７に接続され、先端側はハブ部材３１の背
面中央部に向けて開口している。そして、該塗料通路４
１は、後述する塗料弁４３が開，閉弁することにより、
塗料をハブ部材３１に向けて吐出するものである。Reference numeral 41 denotes a paint passage formed in the inner cylinder 40. The paint passage 41 is connected to the color changing valve device 7 at the base end side through the paint pipe 6 and at the tip end in the center of the rear surface of the hub member 31. It opens toward the section. And the paint passage 4
1 is by opening and closing a paint valve 43 described later,
The paint is discharged toward the hub member 31.
【００４７】４２は外筒３９と内筒４０との間に形成さ
れた溶剤通路を示し、該溶剤通路４２は、その基端側が
溶剤供給配管を介して洗浄弁装置（いずれも図示せず）
に接続され、先端側が内筒４０の先端４０Ｂ側に向けて
開口している。そして、該溶剤通路４２は、後述する先
端側洗浄弁４４が開，閉弁することにより、外部から供
給されるシンナ等の溶剤を内筒４０の先端４０Ｂに向け
て吐出し、この先端４０Ｂに付着した前色塗料を洗浄す
るものである。Reference numeral 42 denotes a solvent passage formed between the outer cylinder 39 and the inner cylinder 40. The solvent passage 42 has a cleaning valve device (neither of which is shown) at the base end side thereof via a solvent supply pipe.
The front end side is opened toward the front end 40B side of the inner cylinder 40. Then, the solvent passage 42 discharges a solvent such as thinner supplied from the outside toward the tip 40B of the inner cylinder 40 by opening and closing a tip side cleaning valve 44 described later, and to the tip 40B. It is for cleaning the attached pre-color paint.
【００４８】４３は常閉の塗料弁を示し、該塗料弁４３
はハウジング２２の基部２２Ａに設けられたアクチュエ
ータ４３Ａと、基端側が該アクチュエータ４３Ａに連結
され、先端側が内筒４０に挿通された弁軸４３Ｂと、該
弁軸４３Ｂの先端側に設けられ、内筒４０の弁座４０Ａ
に離，着座する弁体４３Ｃとから構成されている。そし
て、該塗料弁４３は、弁体４３Ｃが弁座４０Ａに常時着
座して閉弁し、外部から制御エアがアクチュエータ４３
Ａに給，排されることにより、弁軸４３Ｂを縮小させて
弁体４３Ｃを内筒４０の弁座４０Ａから離座させ、塗料
通路４１を開弁するようになっている。Reference numeral 43 represents a normally closed paint valve, and the paint valve 43
Is an actuator 43A provided on the base portion 22A of the housing 22, a valve shaft 43B having a base end side connected to the actuator 43A and a tip end side inserted through the inner cylinder 40, and a valve shaft 43B provided on a tip end side of the valve shaft 43B. Valve seat 40A of cylinder 40
It is composed of a valve body 43C which is separated from and seated on. In the paint valve 43, the valve body 43C is always seated on the valve seat 40A to close the valve, and the control air is externally applied to the actuator 43.
By being supplied to and discharged from A, the valve shaft 43B is contracted, the valve body 43C is separated from the valve seat 40A of the inner cylinder 40, and the paint passage 41 is opened.
【００４９】４４は同じく常閉の先端側洗浄弁を示し、
該先端側洗浄弁４４はハウジング２２の基部２２Ａに設
けられたアクチュエータ４４Ａと、基端側が該アクチュ
エータ４４Ａに連結され、先端側が溶剤通路４２内に挿
通された弁軸４４Ｂと、該弁軸４４Ｂの先端側に設けら
れ、溶剤通路４２の途中を開，閉する弁体４４Ｃとから
構成されている。そして、該先端側洗浄弁４４は、常時
弁体４４Ｃで溶剤通路４２を閉弁状態とし、外部から制
御エアが供給されることによって溶剤通路４２を開弁す
るものである。Reference numeral 44 designates a normally closed tip side washing valve,
The tip side cleaning valve 44 includes an actuator 44A provided on a base portion 22A of the housing 22, a valve shaft 44B having a base end side connected to the actuator 44A, and a tip side inserted through the solvent passage 42, and a valve shaft 44B. The valve body 44C is provided on the tip end side and opens and closes the solvent passage 42 in the middle thereof. The front-end side cleaning valve 44 is configured to always close the solvent passage 42 with the valve element 44C and open the solvent passage 42 by supplying control air from the outside.
【００５０】４５はエアモータ２４のモータケース２４
Ａに高電圧を供給するための接続端子で、該接続端子４
５は高電圧ケーブル１０を介して高電圧発生装置８に接
続されている。従って、半導電性通電膜２３の基端側２
３Ａはエアモータ２４のモータケース２４Ａと接触して
電気的に接続されているから、高電圧ケーブル１０から
の高電圧は半導電性通電膜２３、リング側半導電性膜３
６を介してリング電極３７に給電され、該リング電極３
７から被塗物に向けて放電される。Reference numeral 45 denotes a motor case 24 of the air motor 24.
A connection terminal for supplying a high voltage to A.
5 is connected to a high voltage generator 8 via a high voltage cable 10. Therefore, the base end side 2 of the semiconductive conducting film 23
Since 3A is in contact with and electrically connected to the motor case 24A of the air motor 24, the high voltage from the high voltage cable 10 is applied to the semiconductive conducting film 23 and the ring side semiconductive film 3A.
Is fed to the ring electrode 37 via 6 and the ring electrode 3
7 is discharged toward the object to be coated.
【００５１】本実施例による静電塗装機２１は以上のよ
うに構成されるが、次に、その作動について述べる。The electrostatic coating machine 21 according to this embodiment is constructed as described above, and its operation will be described below.
【００５２】本実施例の静電塗装機２１においても、そ
の塗装作業においては従来技術の静電塗装装置とほぼ同
様に、エアモータ２４によって回転霧化頭２９を高速回
転しつつ、塗料弁４３を開弁することにより、塗料タン
ク内の塗料を塗料通路４１を介して回転霧化頭２９に供
給し、該回転霧化頭２９から噴霧させると共に、高電圧
発生装置８からの高電圧によって噴霧された塗料を帯電
させ、帯電霧化された塗料粒子を静電界の力をかりて被
塗物に塗着させるようになっている。Also in the electrostatic coating machine 21 of the present embodiment, in the coating work, the rotary atomizing head 29 is rotated at a high speed by the air motor 24 while the coating valve 43 is being operated at the same speed as in the electrostatic coating apparatus of the prior art. By opening the valve, the paint in the paint tank is supplied to the rotary atomizing head 29 through the paint passage 41, is sprayed from the rotary atomizing head 29, and is sprayed by the high voltage from the high voltage generator 8. The paint is charged, and the paint particles atomized and charged are applied to the object by using the force of the electrostatic field.
【００５３】然るに、本実施例においては、高電圧発生
装置８から高電圧ケーブル１０、接続端子４５を介して
エアモータ２４のモータケース２４Ａに供給される高電
圧を、該モータケース２４Ａから半導電性通電膜２３、
リング側半導電性膜３６を介してリング電極３７に印加
し、該リング電極３７から放電させることにより回転霧
化頭２９の塗料放出端縁２９Ｂ側にコロナ放電領域を形
成する。However, in this embodiment, the high voltage supplied from the high voltage generator 8 to the motor case 24A of the air motor 24 through the high voltage cable 10 and the connection terminal 45 is semiconductive from the motor case 24A. Current-carrying film 23,
By applying to the ring electrode 37 through the ring-side semi-conductive film 36 and discharging from the ring electrode 37, a corona discharge region is formed on the paint discharge edge 29B side of the rotary atomizing head 29.
【００５４】従って、前記回転霧化頭２９を高速回転さ
せた状態で塗料弁４３を開弁させることにより、塗料通
路４１を介して供給された塗料は、該回転霧化頭２９の
回転によって塗料展延平滑面２９Ａで拡散しつつ、塗料
放出端縁２９Ｂで径方向外側に噴霧される。このとき、
塗料放出端縁２９Ｂの周囲にはコロナ放電領域が形成さ
れているから、該塗料放出端縁２９Ｂから噴霧される塗
料粒子を帯電させることができる。さらに、この噴霧さ
れた帯電塗料粒子はシェーピングエアリング３２から噴
出されるシェーピングエアによって塗料噴霧パターンに
パターン成形されつつ、被塗物との間に形成された静電
界の力をかりて飛行して該被塗物に塗着するようになっ
ている。Therefore, by opening the paint valve 43 in a state where the rotary atomizing head 29 is rotated at a high speed, the paint supplied through the paint passage 41 is coated by the rotation of the rotary atomizing head 29. While spreading on the spread smooth surface 29A, it is sprayed radially outward at the paint discharge edge 29B. At this time,
Since the corona discharge region is formed around the paint discharge edge 29B, the paint particles sprayed from the paint discharge edge 29B can be charged. Further, the sprayed charged paint particles are formed into a paint spray pattern by the shaping air ejected from the shaping air ring 32, and fly with the force of the electrostatic field formed between the sprayed charge paint particles and the object to be coated. It is adapted to be applied to the article to be coated.
【００５５】かくして、本実施例によれば、従来技術の
回転霧化頭５とは異なり、回転霧化頭２９を絶縁性樹脂
材料で形成した上で、半導電性通電膜２３をハウジング
２２のモータ収容部２２Ｃ内周面を覆うように筒部２２
Ｂ先端まで形成すると共に、リング側半導電性膜３６を
外側リング３３の外面を覆うように形成しているから、
図３に示すように、絶縁樹脂により形成されたハウジン
グ２２，エアモータ２４等の塗装装置を構成する部品の
浮遊容量Ｃを、シェーピングエアリング３２の外周面に
成膜したリング側半導電性膜３６の各部分における抵抗
Ｒ0 によって該外周面に個々に分布される分布容量Ｃ0
に分け、該各分布容量Ｃ0 と抵抗Ｒ0 により複数個のＬ
型回路を構成するものとして考えることができる。Thus, according to this embodiment, unlike the conventional rotary atomizing head 5, the rotary atomizing head 29 is formed of an insulating resin material, and then the semiconductive conducting film 23 of the housing 22 is formed. The cylindrical portion 22 covers the inner peripheral surface of the motor housing portion 22C.
Since the B side tip is formed and the ring side semi-conductive film 36 is formed so as to cover the outer surface of the outer ring 33,
As shown in FIG. 3, the ring-side semi-conductive film 36 formed by forming the stray capacitance C of the components such as the housing 22 and the air motor 24, which are formed of an insulating resin, on the outer peripheral surface of the shaping air ring 32 is formed. The distributed capacitance C0 individually distributed on the outer peripheral surface by the resistance R0 in each part of
Into a plurality of Ls by the distributed capacitance C0 and the resistor R0.
It can be considered as constituting a mold circuit.
【００５６】ここで、本実施例による静電塗装機２１が
被塗物３に異常接近した場合には、回転霧化頭２９と被
塗物３との間の空気による電気抵抗Ｒが小さくなり、静
電塗装機２１の各部品による浮遊容量Ｃに蓄えられた電
荷が瞬時に放電しようとする。When the electrostatic coating machine 21 according to this embodiment abnormally approaches the article to be coated 3, the electrical resistance R due to air between the rotary atomizing head 29 and the article to be coated 3 becomes small. , The electric charges accumulated in the stray capacitance C due to the respective parts of the electrostatic coating machine 21 try to be discharged instantaneously.
【００５７】しかし、本実施例では、絶縁性樹脂材料で
形成されたシェーピングエアリング３２の外周面に成膜
されたリング側半導電性膜３６により、浮遊容量Ｃを分
布させた分布容量Ｃ0 と抵抗Ｒ0 により複数個のＬ型回
路を形成しているから、放電時にはリング電極３７側に
位置したＬ型回路中の分布容量Ｃ0 から順次放電し、こ
のとき各分布容量Ｃ0 ，抵抗Ｒ0 の時定数により放電時
間を抑制し、瞬時に浮遊容量Ｃに蓄えられた電荷が放電
するのを防止することができる。なお、放電時における
電流値は着火エネルギに満たない程度に抑えることがで
きる。However, in this embodiment, the ring side semi-conductive film 36 formed on the outer peripheral surface of the shaping air ring 32 made of an insulating resin material distributes the stray capacitance C to a distributed capacitance C0. Since a plurality of L-shaped circuits are formed by the resistor R0, the distributed capacitance C0 in the L-shaped circuit located on the ring electrode 37 side is sequentially discharged at the time of discharge, and at this time, the time constant of each distributed capacitance C0 and resistor R0. Thus, the discharge time can be suppressed and the electric charge accumulated in the stray capacitance C can be prevented from being instantaneously discharged. The current value at the time of discharging can be suppressed to a level less than the ignition energy.
【００５８】また、ハウジング２２には半導電性通電膜
２３を設けているから、該半導電性通電膜２３は給電側
に位置する高電圧発生装置８、高圧ケーブル１０等の浮
遊容量に蓄えられた電荷が瞬時に放電されるのを防止す
る抵抗となり、静電塗装機２１が被塗物３に異常接近し
た場合には、半導電性通電膜２３によって給電側の電荷
が瞬時に放電するのを抑えることができる。Since the housing 22 is provided with the semiconductive conducting film 23, the semiconductive conducting film 23 is stored in the stray capacitance of the high voltage generator 8, the high voltage cable 10 and the like located on the power feeding side. When the electrostatic coating machine 21 approaches the object 3 to be coated abnormally, the semiconductive conductive film 23 causes the electric charge on the power feeding side to be instantaneously discharged. Can be suppressed.
【００５９】この結果、静電塗装機２１と被塗物３との
間に発生する放電エネルギを小さく抑えることができ、
塗料に着火する程のエネルギを放出するのを防止し、火
花放電による火災事故を防止でき、静電塗装機２１の安
全性や信頼性を確実に向上させることができる。As a result, the discharge energy generated between the electrostatic coater 21 and the article to be coated 3 can be suppressed to a small level,
It is possible to prevent discharge of energy enough to ignite the paint, prevent a fire accident due to spark discharge, and reliably improve the safety and reliability of the electrostatic coating machine 21.
【００６０】また、本実施例では、塗料の噴霧パターン
を成形するために回転霧化頭２９から噴霧された塗料に
向けてシェーピングエアを噴出するシェーピングエアリ
ング３２の外側リング３３にリング側半導電性膜３６を
成膜し、電極形成突起３３Ｂ先端にリング電極３７を成
膜する構成としているから、別途に環状体を設けること
なく、在来からのシェーピングエアリング３２を有効利
用し、シェーピングエア噴出機能に付加してリング側半
導電性膜３６，リング電極３７を成膜する部材として活
用することができ、設計変更することなく外部電極を設
けることができる。Further, in the present embodiment, the ring side semi-conductivity is applied to the outer ring 33 of the shaping air ring 32 for ejecting shaping air from the rotary atomizing head 29 toward the paint sprayed to form the spray pattern of the paint. Since the conductive film 36 is formed and the ring electrode 37 is formed at the tip of the electrode forming projection 33B, the conventional shaping air ring 32 is effectively used without separately providing a ring-shaped body, and the shaping air is formed. In addition to the jetting function, it can be utilized as a member for forming the ring side semi-conductive film 36 and the ring electrode 37, and the external electrode can be provided without changing the design.
【００６１】次に、図４に本発明による第２の実施例を
示すに、本実施例の特徴は、回転霧化頭の塗料放出端縁
外周に霧化頭側半導電性膜を形成したことにある。な
お、本実施例においは前述した第１の実施例と同一の構
成要素に同一の符号を付し、その説明を省略するものと
する。Next, FIG. 4 shows a second embodiment according to the present invention. The feature of this embodiment is that the atomizing head side semi-conductive film is formed on the outer periphery of the paint discharge edge of the rotary atomizing head. Especially. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.
【００６２】図中、５１は第１の実施例に用いられた回
転霧化頭２９の代わりに用いられる回転霧化頭を示し、
該回転霧化頭５１は前記回転霧化頭２９と同様に、エア
モータ２４外でかつシェーピングエアリング３２の径方
向内側に位置して回転軸２８の先端側に固着され、絶縁
性樹脂材料によってベル状に形成され、基端側が前記回
転軸２８の先端側に取付けられ、先端側が漸次拡開する
朝顔状に形成されている。また、該回転霧化頭５１の内
周側には、軸方向中間部に位置して絶縁性樹脂材料から
なる後部ハブ部材３０が装着され、該後部ハブ部材３０
から前方は塗料展延平滑面５１Ａとなり、該塗料展延平
滑面５１Ａの外周端は、当該塗料展延平滑面５１Ａによ
って拡散した塗料を噴霧する塗料放出端縁５１Ｂとな
る。In the figure, 51 denotes a rotary atomizing head used in place of the rotary atomizing head 29 used in the first embodiment,
Similar to the rotary atomizing head 29, the rotary atomizing head 51 is located outside the air motor 24 and inside the shaping air ring 32 in the radial direction, and is fixed to the tip end side of the rotary shaft 28 and is made of an insulating resin material. The rotary shaft 28 has a base end side attached to the tip end side of the rotary shaft 28, and the tip end side is formed into a morning glory that gradually expands. Further, on the inner peripheral side of the rotary atomizing head 51, a rear hub member 30 made of an insulating resin material is mounted at an intermediate portion in the axial direction.
From the front to the front is a paint spread smooth surface 51A, and the outer peripheral end of the paint spread smooth surface 51A serves as a paint discharge edge 51B for spraying the paint diffused by the paint spread smooth surface 51A.
【００６３】５２は回転霧化頭５１の塗料放出端縁５１
Ｂ外周に位置して成膜された霧化頭側半導電性膜を示
し、該霧化頭側半導電性膜５２には半導電性通電膜２３
とリング側半導電性膜３６およびリング電極３７を介し
て高電圧が給電される。Reference numeral 52 denotes a paint discharge edge 51 of the rotary atomizing head 51.
The atomized head side semi-conductive film formed on the outer periphery of B is shown, and the atomized head side semi-conductive film 52 has a semi-conductive conducting film 23.
A high voltage is supplied through the ring-side semiconductive film 36 and the ring electrode 37.
【００６４】然るに、本実施例による静電塗装機におい
ては、回転霧化頭５１の塗料放出端縁５１Ｂ外周に霧化
頭側半導電性膜５２を形成したから、該霧化頭側半導電
性膜５２に半導電性通電膜２３，リング側半導電性膜３
６およびリング電極３７を介して高電圧を印加すること
ができ、塗料放出端縁５１Ｂから放出される塗料を直接
的に帯電させることができる。この結果、被塗物への塗
着効率を高めることができる。However, in the electrostatic coating machine according to this embodiment, since the atomizing head side semi-conductive film 52 is formed on the outer periphery of the paint discharge edge 51B of the rotary atomizing head 51, the atomizing head side semi-conductive film is formed. Semiconductive film 23, ring-side semiconductive film 3 on conductive film 52
6 and the ring electrode 37, a high voltage can be applied, and the paint discharged from the paint discharge edge 51B can be directly charged. As a result, it is possible to improve the coating efficiency on the article to be coated.
【００６５】次に、図５および図６に本発明による第３
の実施例を示すに、本実施例の特徴は、高電圧発生装置
から高電圧をリード線を介して給電することにある。な
お、本実施例においても、前述した第１の実施例と同一
の構成要素に同一の符号を付し、その説明を省略するも
のとする。Next, FIG. 5 and FIG. 6 show a third embodiment of the present invention.
The present embodiment is characterized in that a high voltage is supplied from a high voltage generator through a lead wire. Also in this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.
【００６６】図中、６１は本実施例による静電塗装機、
６２は該静電塗装機６１のハウジングをそれぞれ示す。In the figure, 61 is an electrostatic coating machine according to this embodiment,
Reference numerals 62 denote housings of the electrostatic coating machine 61, respectively.
【００６７】６３はシェーピングエアリング３２の外側
リング３３の外周側に設けられた本実施例によるリング
側半導電性膜を示し、該リング側半導電性膜６３は、図
６に示す如く、雄ねじ部３３Ａの先端側から電極形成突
起３３Ｂ側までを覆うように塗布手段によって膜性され
ている。また、該リング側半導電性膜６３は、前記第１
の実施例によるリング側半導電性膜３６と同様に、例え
ば、導電性樹脂を混練したポリエステル，エポキシ，フ
ッ素樹脂等によって形成されている。そして、該リング
側半導電性膜６３の基端側６３Ａはハウジング６２の筒
部６２Ｂ先端と対応する位置で外側リング３３の雄ねじ
部３３Ａとの段部まで形成され、先端側６３Ｂは電極形
成突起３３Ｂに延在している。Reference numeral 63 denotes a ring-side semiconductive film according to this embodiment, which is provided on the outer peripheral side of the outer ring 33 of the shaping air ring 32. The ring-side semiconductive film 63 has a male screw as shown in FIG. It is film-formed by the coating means so as to cover from the tip side of the portion 33A to the electrode forming projection 33B side. In addition, the ring-side semiconductive film 63 has the first
Similar to the ring side semi-conductive film 36 according to the embodiment, it is formed of, for example, polyester, epoxy, fluororesin or the like in which a conductive resin is kneaded. The proximal side 63A of the ring-side semiconductive film 63 is formed up to a step with the male screw portion 33A of the outer ring 33 at a position corresponding to the distal end of the cylindrical portion 62B of the housing 62, and the distal end side 63B is an electrode forming protrusion. It extends to 33B.
【００６８】６４は外側リング３３の電極形成突起３３
Ｂ外周に位置してリング側半導電性膜６３の先端側６３
Ｂに一体に設けられた本実施例によるリング電極を示
し、該リング電極６４はリング側半導電性膜６３と同様
に、例えば、導電性樹脂を混練したポリエステル，エポ
キシ，フッ素樹脂等によって形成されている。そして、
該リング電極６４は、リング側半導電性膜６３および高
抵抗素子６６を介して給電される−６０〜−１２０ｋＶ
程度の高電圧を放電し、回転霧化頭２９の塗料放出端縁
２９Ｂから噴霧される塗料を帯電させる。Reference numeral 64 denotes an electrode forming protrusion 33 of the outer ring 33.
Located on the outer periphery of B, the tip side 63 of the ring-side semiconductive film 63
A ring electrode according to the present embodiment integrally provided in B is shown. The ring electrode 64 is formed of, for example, polyester, epoxy, fluororesin, etc., which is kneaded with a conductive resin, like the ring side semi-conductive film 63. ing. And
The ring electrode 64 is fed with power through the ring-side semiconductive film 63 and the high resistance element 66, −60 to −120 kV.
A high voltage of a certain degree is discharged, and the paint sprayed from the paint discharge edge 29B of the rotary atomizing head 29 is charged.
【００６９】６５はハウジング６２の外周側に位置して
軸方向に伸長するように設けられたリード線で、該リー
ド線６５は図５に示すようにリング側半導電性膜３６を
高電圧ケーブル１０を介して高電圧発生装置８に接続す
るものである。Reference numeral 65 denotes a lead wire which is located on the outer peripheral side of the housing 62 and extends in the axial direction. The lead wire 65 has a ring-side semiconductive film 36 as shown in FIG. It is connected to the high voltage generator 8 via 10.
【００７０】６６はリード線６３の途中に位置してハウ
ジング６２の筒部２２Ｂに埋設された高抵抗素子で、該
高抵抗素子６６の抵抗値は、リング側半導電性膜３６の
抵抗値と合計した抵抗値が１０7 〜１０9 Ωの範囲、例
えば、高電圧が６０ｋＶ以下のときには１０7 〜１０8
Ωとなるように設定され、６０ｋＶ以上のときには１０
8 〜１０9 Ωとなるように設定される。Reference numeral 66 is a high resistance element located in the middle of the lead wire 63 and embedded in the cylindrical portion 22B of the housing 62. The resistance value of the high resistance element 66 is equal to the resistance value of the ring side semiconductive film 36. The total resistance value is in the range of 10 7 to 10 9 Ω, for example, 10 7 to 10 8 when the high voltage is 60 kV or less.
It is set so that it becomes 10 Ω when it is 60 kV or more.
It is set to be 8 to 10 9 Ω.
【００７１】従って、高抵抗素子６６によって大きな抵
抗値を得るようにしているから、塗装機が被塗物３と短
絡しても、該高抵抗素子６６よりも給電側に位置する高
電圧発生装置８、高電圧ケーブル１０、エアモータ２４
等に蓄えられた電荷が放電するのを抑えることができ
る。Therefore, since the high resistance element 66 obtains a large resistance value, even if the coating machine is short-circuited with the object to be coated 3, the high voltage generating device located on the power supply side of the high resistance element 66. 8, high voltage cable 10, air motor 24
It is possible to suppress the discharge of the electric charge stored in the electric field.
【００７２】かくして、このように構成される本実施例
においても、前記第１の実施例とほぼ同様の作用効果を
得ることができるものの、特に、本実施例では、高抵抗
素子６６を介在したリード線６５およびリング側半導電
性膜６３を介して直接的にリング電極６４に高電圧を印
加するようにしているから、エアモータ２４やフィード
チューブ３８が高電圧に帯電して塗料中の顔料が析出す
るのを防止でき、異物の混入による塗装不良の発生を防
止して、塗装品質を向上することができる。Thus, in this embodiment having the above-described structure, the same operational effect as that of the first embodiment can be obtained, but in particular, in this embodiment, the high resistance element 66 is interposed. Since a high voltage is directly applied to the ring electrode 64 via the lead wire 65 and the ring-side semiconductive film 63, the air motor 24 and the feed tube 38 are charged to a high voltage and the pigment in the paint is removed. It is possible to prevent precipitation, prevent the occurrence of coating defects due to the inclusion of foreign matter, and improve the coating quality.
【００７３】なお、前記各実施例では、シェーピングエ
アリング３２の外側リング３３に電極形成突起３３Ｂを
設け、該電極形成突起３３Ｂの外面にリング電極３７，
６４をリング側半導電性膜３６，６３と一体に皮膜状に
形成するものとして例示したが、例えば、図７に示す第
１の変形例の如く、電極形成突起を廃止したシェーピン
グエアリング７１の外側リング７２の先端部に半導電性
材料から断面三角形状に形成されたリング電極７３を固
着し、該リング電極７３にリング側半導電性膜７４を電
気的に接続する構成としてもよく、またリング電極は半
導電性材料だけでなく導電性材料によって形成してもよ
い。In each of the above embodiments, the outer ring 33 of the shaping air ring 32 is provided with the electrode forming protrusion 33B, and the ring electrode 37,
Although 64 is illustrated as being integrally formed with the ring-side semi-conductive films 36 and 63 in a film shape, for example, as in the first modification shown in FIG. A ring electrode 73 formed of a semiconductive material and having a triangular cross section may be fixed to the tip of the outer ring 72, and the ring side semiconductive film 74 may be electrically connected to the ring electrode 73. The ring electrode may be made of a conductive material as well as a semi-conductive material.
【００７４】また、前記各実施例では、ベル型（カップ
状）の回転霧化頭２９を用いた静電塗装機２１，６１を
例に挙げて説明したが、本発明はこれに限らず、例え
ば、図８に示す第２の変形例の如く、静電塗装機８１
を、ハウジング８２と、該ハウジング８２に内蔵された
エアモータ（図示せず）に回転可能に支持された回転軸
８３と、該回転軸８３の先端に取付けられたディスク型
の回転霧化頭８４と、前記ハウジング８２から該回転霧
化頭８４の外周側に向けて伸長した環状体８５と、該環
状体８５の先端に設けられたリング電極８６と、該リン
グ電極８６と高電圧発生装置とを接続する環状体側半導
電性膜８７とから構成してもよい。さらに、前述した第
２の実施例のように、図８中の点線で示す如く、回転霧
化頭８４の外周に霧化頭側半導電性膜８８を薄膜状に形
成してもよい。Further, in each of the above-mentioned embodiments, the electrostatic coating machines 21 and 61 using the bell-shaped (cup-shaped) rotary atomizing head 29 have been described as an example, but the present invention is not limited to this. For example, as in the second modification shown in FIG.
A housing 82, a rotary shaft 83 rotatably supported by an air motor (not shown) built in the housing 82, and a disk-type rotary atomizing head 84 attached to the tip of the rotary shaft 83. An annular body 85 extending from the housing 82 toward the outer peripheral side of the rotary atomizing head 84, a ring electrode 86 provided at the tip of the annular body 85, the ring electrode 86 and a high voltage generator. You may comprise from the annular body side semiconductive film 87 connected. Further, as in the second embodiment described above, the atomization head side semi-conductive film 88 may be formed in a thin film shape on the outer circumference of the rotary atomization head 84, as shown by the dotted line in FIG.
【００７５】さらに、前記各実施例では、高電圧発生装
置８を静電塗装機の外部に設けた場合を例示したが、こ
れに替えて、高電圧発生装置を静電塗装機に内蔵するよ
うにしてもよい。Further, in each of the above-mentioned embodiments, the case where the high voltage generator 8 is provided outside the electrostatic coating machine is illustrated, but instead of this, the high voltage generator may be built in the electrostatic coating machine. You may
【００７６】[0076]
【発明の効果】以上詳述した如く、請求項１の発明によ
れば、回転霧化頭を絶縁樹脂材料によって形成すると共
に、同じく絶縁樹脂材料によって形成された環状体の周
面にはリング電極に高電圧発生手段からの高電圧を印加
するために環状体側半導電性膜を形成したから、塗装装
置を構成する部品の浮遊容量を、環状体の周面に形成し
た環状体側半導電性膜の各部分における抵抗で環状体の
周面に分布される分布容量とすることができ、それぞれ
の抵抗毎に分布容量が接続されたＬ型回路を環状体の周
面に複数個形成することになる。これにより、回転霧化
頭と被塗物とが異常接近したとしても、環状体の先端側
に形成されたリング電極側の位置にあるＬ型回路中の分
布容量から蓄えられた電荷を順次放電していくから、浮
遊容量に蓄えられた電荷が瞬時に放電するのを抑え、放
電エネルギを低くすることができる。しかも、浮遊容量
は複数の分布容量を並列に接続しているから、各分布容
量における静電容量は小さくなり、放電時における静電
エネルギを小さく抑えることができ、さらに半導電性膜
による各抵抗と分布容量からＬ型回路をなすために、該
Ｌ型回路の放電時には時定数によって電荷の放電速度を
遅らせることができ、分布容量から放電される電流値を
低く抑えることができる。この結果、放出される電荷を
制限して塗料が着火できるだけのエネルギが瞬時に放出
されるのを阻止し、火花放電を確実に防止でき、安全性
を高めることができる。As described above in detail, according to the invention of claim 1, the rotary atomizing head is formed of an insulating resin material, and a ring electrode is formed on the peripheral surface of the annular body also formed of the insulating resin material. Since the annular body side semi-conductive film is formed to apply a high voltage from the high voltage generating means to the annular body side semi-conductive film formed on the peripheral surface of the annular body, the stray capacitance of the parts constituting the coating apparatus is formed. The distributed capacitance distributed on the circumferential surface of the annular body can be obtained by the resistance in each part of the above, and a plurality of L-shaped circuits to which the distributed capacitance is connected for each resistance are formed on the circumferential surface of the annular body. Become. As a result, even if the rotary atomizing head and the object to be coated become abnormally close to each other, the charge accumulated from the distributed capacitance in the L-shaped circuit at the position on the ring electrode side formed on the tip side of the annular body is sequentially discharged. Therefore, it is possible to suppress the electric charge accumulated in the stray capacitance from being instantaneously discharged and reduce the discharge energy. Moreover, since a plurality of distributed capacitances are connected in parallel as stray capacitances, the electrostatic capacitance at each distributed capacitance becomes small, and the electrostatic energy at the time of discharge can be suppressed to a small level. Since the L-type circuit is formed from the distributed capacitance, the discharging rate of the charges can be delayed by the time constant when the L-type circuit is discharged, and the current value discharged from the distributed capacitance can be suppressed to a low value. As a result, it is possible to limit the amount of electric charge that is released to prevent instantaneous release of energy enough to ignite the paint, and it is possible to reliably prevent spark discharge and improve safety.
【００７７】請求項２の発明では、前記回転霧化頭の塗
料放出端縁外周に霧化頭側半導電性膜を形成したから、
環状体の先端に位置したリング電極に印加された高電圧
は霧化頭側半導電性膜にも給電され、回転霧化頭の塗料
放出端縁から放出される塗料粒子を直接帯電させること
ができる。これにより、静電塗装機の塗着効率を高める
ことができる。According to the second aspect of the invention, since the atomizing head side semi-conductive film is formed on the outer periphery of the paint discharge edge of the rotary atomizing head,
The high voltage applied to the ring electrode located at the tip of the annular body is also supplied to the atomizing head side semi-conductive film to directly charge the paint particles discharged from the paint discharging edge of the rotary atomizing head. it can. Thereby, the coating efficiency of the electrostatic coating machine can be improved.
【００７８】請求項３の発明では、ハウジングの周面に
半導電性通電膜を形成し、該半導電性通電膜，環状体側
半導電性膜を介してリング電極へ高電圧発生手段からの
高電圧を給電することができ、該リング電極近傍にコロ
ナ放電領域を形成し、該コロナ放電領域によって塗料放
出端縁から放出される塗料を帯電させることができる。
また、被塗物に塗装機が異常接近したときには、前記半
導電性通電膜は抵抗を有するから、高電圧の給電側の高
圧ケーブル等の浮遊容量に蓄えられた電荷が瞬時に放電
するのを防止する。According to the third aspect of the present invention, a semiconductive conducting film is formed on the peripheral surface of the housing, and a high voltage from the high voltage generating means is applied to the ring electrode through the semiconductive conducting film and the annular body side semiconductive film. A voltage can be supplied, a corona discharge region can be formed in the vicinity of the ring electrode, and the paint discharged from the paint discharge edge can be charged by the corona discharge region.
Further, when the coating machine abnormally approaches the object to be coated, the semiconductive conducting film has resistance, so that the electric charge accumulated in the stray capacitance of the high-voltage power supply side high-voltage cable or the like is instantaneously discharged. To prevent.
【００７９】請求項４の発明では、ハウジングに高抵抗
素子を設け、リング電極へはこの高抵抗素子、環状体側
半導電性膜を介して高電圧を印加するから、高圧ケーブ
ル等の浮遊容量に蓄えられた電荷が瞬時に放電するのを
防止する。また、塗料が高電圧に帯電するのを防止する
と共に、塗料中の顔料の析出を防止することにより、異
物の混入による塗装不良を防止して塗装品質を向上する
ことができる。According to the invention of claim 4, a high resistance element is provided in the housing, and a high voltage is applied to the ring electrode through the high resistance element and the semiconductive film on the annular body side. The stored charge is prevented from being instantly discharged. Further, by preventing the paint from being charged to a high voltage and by preventing the pigment from precipitating in the paint, it is possible to prevent coating defects due to the mixing of foreign matters and improve the coating quality.
【００８０】請求項５の発明では、リング電極を環状体
の先端側表面に半導電性材料を皮膜状に形成したから、
当該リング電極を容易に形成することができる。According to the fifth aspect of the invention, the ring electrode is formed in the form of a film on the tip side surface of the annular body by a semiconductive material.
The ring electrode can be easily formed.
【００８１】請求項６の発明では、前記環状体をシェー
ピングエアリングとし、前記リング電極を該シェーピン
グエアリングの先端に設けたから、環状体としてシェー
ピングエアを噴出するシェーピングエアリングを用い、
該シェーピングエアリングの先端にリング電極を設ける
ことにより、別途環状体を設けることなく、在来からの
シェーピングエアリングを有効利用し、シェーピングエ
ア噴出機能に付加してリング電極を形成する部材として
活用することができ、設計変更することなく電極を設け
ることができる。According to the sixth aspect of the invention, since the annular body is a shaping air ring and the ring electrode is provided at the tip of the shaping air ring, a shaping air ring for ejecting shaping air is used as the annular body.
By providing a ring electrode at the tip of the shaping air ring, a conventional shaping air ring can be effectively used without providing a separate annular body, and used as a member for forming a ring electrode in addition to the shaping air ejection function. The electrodes can be provided without changing the design.
【図１】第１の実施例による静電塗装機を示す縦断面図
である。FIG. 1 is a vertical sectional view showing an electrostatic coating machine according to a first embodiment.
【図２】図１中の回転霧化頭、シェーピングエアリン
グ、回転軸等を示す要部拡大縦断面図である。FIG. 2 is an enlarged vertical sectional view of a main part showing a rotary atomizing head, a shaping air ring, a rotary shaft and the like in FIG.
【図３】第１の実施例における回転霧化頭と浮遊容量と
の関係を示す説明図である。FIG. 3 is an explanatory diagram showing a relationship between a rotary atomizing head and a stray capacitance in the first embodiment.
【図４】第２の実施例による静電塗装機中の回転霧化
頭、シェーピングエアリング、回転軸等を示す要部拡大
縦断面図である。FIG. 4 is an enlarged vertical cross-sectional view of essential parts showing a rotary atomizing head, a shaping air ring, a rotary shaft, and the like in an electrostatic coating machine according to a second embodiment.
【図５】第３の実施例による静電塗装機を示す縦断面図
である。FIG. 5 is a vertical sectional view showing an electrostatic coating machine according to a third embodiment.
【図６】図５中の回転霧化頭、シェーピングエアリン
グ、回転軸等を示す要部拡大縦断面図である。FIG. 6 is an enlarged vertical cross-sectional view of essential parts showing a rotary atomizing head, a shaping air ring, a rotary shaft and the like in FIG.
【図７】第１の変形例によるシェーピングエアリング、
リング電極、半導電性膜を拡大して示す縦断面図であ
る。FIG. 7 is a shaping air ring according to a first modification,
It is a longitudinal cross-sectional view which expands and shows a ring electrode and a semiconductive film.
【図８】第２の変形例による静電塗装機を示す縦断面図
である。FIG. 8 is a vertical sectional view showing an electrostatic coating machine according to a second modification.
【図９】従来技術による静電塗装装置の系統図である。FIG. 9 is a system diagram of an electrostatic coating device according to a conventional technique.
【図１０】従来技術における回転霧化頭と浮遊容量との
関係を示す説明図である。FIG. 10 is an explanatory diagram showing a relationship between a rotary atomizing head and a stray capacitance in a conventional technique.
８ 高電圧発生装置 ２１，６１ 静電塗装機 ２２，６２，８２ ハウジング ２３ 半導電性通電膜 ３６，６３，７４，８７ リング側半導電性膜（環状体
側半導電性膜） ２８，８３ 回転軸 ２９，５１，８４ 回転霧化頭 ２９Ｂ，５１Ｂ，８４Ｂ 塗料放出端縁 ３２，７１ シェーピングエアリング（環状体） ３７，６４，７６，８６ リング電極 ５２，８８ 霧化頭側半導電性膜 ６５ リード線 ６６ 高抵抗素子 ８５ 環状体8 High voltage generator 21,61 Electrostatic coating machine 22,62,82 Housing 23 Semi-conducting conductive film 36,63,74,87 Ring side semi-conducting film (annular body side semi-conducting film) 28,83 Rotating shaft 29,51,84 Rotary atomizing head 29B, 51B, 84B Paint discharge edge 32,71 Shaping air ring (annular body) 37,64,76,86 Ring electrode 52,88 Atomizing head side semi-conductive film 65 Lead Line 66 High resistance element 85 Annular body
Claims (6)
回転駆動するエアモータが設けられたハウジングと、絶
縁樹脂材料によって先端が塗料放出端縁となったカップ
状またはディスク状に形成され、該ハウジングの先端側
に位置した回転軸に設けられた回転霧化頭と、該回転霧
化頭の外周面を囲むように円環状に形成され、基端が前
記ハウジングに設けられると共に先端が該回転霧化頭の
塗料放出端縁近傍に位置する環状体と、半導電性材料ま
たは導電性材料によって形成され、該環状体の先端に設
けられたリング電極と、該リング電極に高電圧発生手段
からの高電圧を印加するため、前記環状体の周面に設け
られた半導電性材料からなる環状体側半導電性膜とから
構成してなる回転霧化型塗装装置。1. A housing made of an insulating resin material in which an air motor for rotationally driving a rotary shaft is provided, and a cup-shaped or disk-shaped housing made of an insulating resin material with a tip serving as a paint discharge edge. A rotary atomizing head provided on a rotary shaft located on the distal end side of the housing and an annular shape surrounding the outer peripheral surface of the rotary atomizing head, the base end of which is provided in the housing and the distal end of the rotary atomizing head. An annular body located in the vicinity of the paint discharge edge of the atomizing head, a ring electrode formed of a semi-conductive material or a conductive material and provided at the tip of the annular body, and a high voltage generating means for the ring electrode. In order to apply a high voltage, the rotary atomization type coating device comprising an annular body side semiconductive film made of a semiconductive material provided on the peripheral surface of the annular body.
半導電性材料からなる霧化頭側半導電性膜を形成してな
る請求項１に記載の回転霧化型塗装装置。2. The rotary atomization type coating apparatus according to claim 1, wherein an atomization head side semi-conductive film made of a semi-conductive material is formed on the outer periphery of the paint discharge edge of the rotary atomization head.
手段から環状体側半導電性膜に高電圧を印加するために
半導電性材料からなる半導電性通電膜を形成してなる請
求項１記載の回転霧化頭型塗装装置。3. A semiconductive conducting film made of a semiconductive material is formed on the peripheral surface of the housing so as to apply a high voltage from the high voltage generating means to the annular body side semiconductive film. 1. The rotary atomizing head type coating device described in 1.
ら環状体側半導電性膜に高電圧を印加するためのリード
線を設け、該リード線の途中には高抵抗素子を設けてな
る請求項１記載の回転霧化頭型塗装装置。4. The housing is provided with a lead wire for applying a high voltage from the high voltage generating means to the semiconductive film on the annular body side, and a high resistance element is provided in the middle of the lead wire. 1. The rotary atomizing head type coating device described in 1.
表面に皮膜状に形成してなる請求項１記載の回転霧化頭
型塗装装置。5. The rotary atomizing head type coating apparatus according to claim 1, wherein the ring electrode is formed in a film shape on the tip side surface of the annular body.
るためのシェーピングエアを噴出するシェーピングエア
リングとし、前記リング電極を該シェーピングエアリン
グの先端に設けてなる請求項１記載の回転霧化頭型塗装
装置。6. The rotary atomizing head according to claim 1, wherein the annular body is a shaping air ring for ejecting shaping air for forming a paint spray pattern, and the ring electrode is provided at the tip of the shaping air ring. Type coating equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34026094A JP3276796B2 (en) | 1994-12-29 | 1994-12-29 | Rotary atomizing head type coating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34026094A JP3276796B2 (en) | 1994-12-29 | 1994-12-29 | Rotary atomizing head type coating equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08187453A true JPH08187453A (en) | 1996-07-23 |
| JP3276796B2 JP3276796B2 (en) | 2002-04-22 |
Family
ID=18335243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34026094A Expired - Fee Related JP3276796B2 (en) | 1994-12-29 | 1994-12-29 | Rotary atomizing head type coating equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3276796B2 (en) |
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| JP2017013009A (en) * | 2015-07-01 | 2017-01-19 | ランズバーグ・インダストリー株式会社 | Electrostatic coating device and electrostatic coating machine |
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|---|---|---|---|---|
| EP2859955A4 (en) * | 2012-06-06 | 2016-03-02 | Electrostatic painting apparatus | |
| JP2016516576A (en) * | 2013-04-22 | 2016-06-09 | サメ テクノロジ | Electrostatic spraying device for spraying liquid application products, and spraying equipment equipped with such spraying device |
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| JP2017013009A (en) * | 2015-07-01 | 2017-01-19 | ランズバーグ・インダストリー株式会社 | Electrostatic coating device and electrostatic coating machine |
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| US10543494B2 (en) | 2015-07-01 | 2020-01-28 | Ransburg Industrial Finishing K.K. | Electrostatic coating device and system |
| CN110180729A (en) * | 2019-06-24 | 2019-08-30 | 天津铭捷智能装备有限公司 | A kind of painting expects pipe, rotation cup and atomizer spray device |
| JP2023164226A (en) * | 2022-04-28 | 2023-11-10 | カーライル フルイド テクノロジーズ エルエルシー | Electrostatic coating machine |
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| Publication number | Publication date |
|---|---|
| JP3276796B2 (en) | 2002-04-22 |
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