JPH0450908Y2 - - Google Patents

Description

【考案の詳細な説明】 ［産業上の利用分野］ 本考案は、回転霧化頭を高速回転することによ
り塗料を霧化し、霧化された帯電塗料粒子を電気
力線に沿つて被塗物に向けて飛行塗着させるよう
にしてなる形式の静電塗装装置に関するものであ
る。[Detailed description of the invention] [Industrial application field] This invention atomizes paint by rotating a rotating atomizer head at high speed, and directs the atomized charged paint particles along the lines of electric force onto the object to be coated. This invention relates to an electrostatic coating device that performs flying coating toward the target area.

［従来の技術］ 従来、この種の静電塗装装置は第３図に示す如
く塗装機本体を構成するハウジング１と、該ハウ
ジング１内に設けられたエアモータ２と、該エア
モータ２によつて回転せしめられる回転軸３と、
該回転軸３の先端に取り付けられ、塗料供給管４
を介して供給される塗料を回転霧化する回転霧化
頭５とを有し、該ハウジング１は外周が絶縁性部
材からなる筒状のカバー６により囲まれている。
又、前記ハウジング１には回転霧化頭５に高電圧
を印加する高電圧発生装置７が接続され、該高電
圧発生装置７は霧化された塗料粒子を帯電させる
と共に、前記回転霧化頭５と被塗物８との間に電
界を形成させて、電気力線Ｓを発生させるもので
ある。ここで、前記ハウジング１はその後端に取
り付けられたインシユレートサポートと呼ばれる
ブラケツト９を介してレシプロケータ（図示せ
ず）に取り付けられ、往復動できるようになつて
いる。[Prior Art] Conventionally, as shown in FIG. 3, this type of electrostatic coating device includes a housing 1 constituting the main body of the coating machine, an air motor 2 provided in the housing 1, and a rotation system using the air motor 2. A rotating shaft 3 that is pressed,
A paint supply pipe 4 is attached to the tip of the rotating shaft 3.
The housing 1 has a rotary atomizing head 5 for rotary atomizing the paint supplied through the housing 1, and the outer periphery of the housing 1 is surrounded by a cylindrical cover 6 made of an insulating material.
Further, a high voltage generator 7 that applies a high voltage to the rotary atomizing head 5 is connected to the housing 1, and the high voltage generator 7 charges the atomized paint particles and also charges the atomized paint particles. 5 and the object to be coated 8 to generate electric lines of force S. Here, the housing 1 is attached to a reciprocator (not shown) via a bracket 9 called an insulating support attached to its rear end, so that it can reciprocate.

そして、塗装時においては、塗料供給管４を介
して回転霧化頭に塗料を供給し、該回転霧化頭５
を高速回転させ、塗料を霧化して微粒子化すると
共に、当該塗料粒子を高電圧発生装置７により帯
電させ、この帯電塗料粒子を前記電気力線Ｓに沿
つて飛行させ、被塗物８に静電塗着させるもので
ある。 During painting, paint is supplied to the rotating atomizing head via the paint supply pipe 4, and the rotating atomizing head 5
is rotated at high speed to atomize the paint into fine particles, and the paint particles are charged by the high voltage generator 7, and the charged paint particles are caused to fly along the electric lines of force S, and are statically applied to the object 8 to be coated. It is electrocoated.

ところで、塗料には大きく分けて、電気抵抗の
比較的大きな溶剤系塗料と、電気抵抗の比較的小
さな水系塗料及びメタリツク塗料とがあり、塗料
の種類に応じて前記高電圧の印加の方法が相違す
る。 By the way, paints can be broadly divided into solvent-based paints that have relatively high electrical resistance, and water-based paints and metallic paints that have relatively low electrical resistance, and the method of applying the high voltage differs depending on the type of paint. do.

即ち、一般に、危険防止の観点から塗料供給管
４、塗料タンクはアースに接続して使用するが、
溶剤系塗料は前述の如く比較的大きな電気抵抗を
有しているため、回転霧化頭５に高電圧を印加し
ても、該回転霧化頭５が塗料供給管４を介してア
ース電位になつてしまう恐れがない。従つて、溶
剤系塗料にあつては高電圧発生装置７によりハウ
ジング１自体に高電圧を印加し、回転霧化頭５で
微粒化するときに帯電させることができる。従つ
て、第３図に示す如くハウジング１自体を高電圧
発生装置７に接続し、回転霧化頭５に高電圧を印
加することにより、溶剤系塗料を該回転霧化頭５
において帯電させることができる。 That is, in general, the paint supply pipe 4 and the paint tank are connected to the ground for safety reasons.
As mentioned above, solvent-based paints have a relatively large electrical resistance, so even if a high voltage is applied to the rotating atomizing head 5, the rotating atomizing head 5 will not reach the ground potential through the paint supply pipe 4. There is no fear of getting used to it. Therefore, in the case of a solvent-based paint, a high voltage can be applied to the housing 1 itself by the high voltage generator 7, and the paint can be charged when it is atomized by the rotary atomizing head 5. Therefore, as shown in FIG. 3, by connecting the housing 1 itself to a high voltage generator 7 and applying a high voltage to the rotating atomizing head 5, the solvent-based paint is transferred to the rotating atomizing head 5.
It can be charged at

一方、水系塗料及びメタリツク塗料は電気抵抗
が小さいので、前述の如く塗料供給管４、塗料タ
ンクをアースに接続した場合、該塗料供給管４内
の塗料を介して回転霧化頭５がアース電位に短絡
してしまい、塗料を帯電させることができない。
従つて、この場合には第４図に示す如く、回転霧
化頭５の近傍に位置してカバー６の外周に外部電
極１０を設け、該外部電極１０を前記高電圧発生
装置７に接続し、回転霧化頭５の外部にコロナ放
電領域を形成することにより、該回転霧化頭５で
微粒化された塗料粒子を外部において帯電させる
構成を採用している。 On the other hand, since water-based paints and metallic paints have low electrical resistance, when the paint supply pipe 4 and paint tank are connected to the ground as described above, the rotating atomizing head 5 is connected to the ground potential through the paint in the paint supply pipe 4. This causes a short circuit and the paint cannot be charged.
Therefore, in this case, as shown in FIG. 4, an external electrode 10 is provided on the outer periphery of the cover 6 near the rotating atomizing head 5, and the external electrode 10 is connected to the high voltage generator 7. By forming a corona discharge region outside the rotary atomizing head 5, paint particles atomized by the rotary atomizing head 5 are charged externally.

［考案が解決しようとする課題］ 前述の如く、従来技術においては塗料の種類に
応じて高電圧の印加方法と帯電方法が異なるの
で、塗装装置としては塗料の種類に応じて、溶剤
系塗料用の静電塗装装置と、水系塗料またはメタ
リツク塗料用の静電塗装装置の２種類を用意して
おかなければならない。従つて、従来技術のもの
は、購入コスト、設置スペース等の観点から不経
済であるという問題点があつた。[Problems to be solved by the invention] As mentioned above, in the conventional technology, the method of applying high voltage and the method of charging differ depending on the type of paint, so the coating equipment for solvent-based paint is different depending on the type of paint. Two types of electrostatic coating equipment must be prepared: one for water-based paints or metallic paints. Therefore, the conventional technology has the problem of being uneconomical in terms of purchase cost, installation space, etc.

本考案は前記従来技術の欠点に鑑みてなされた
もので、溶剤系塗料、水系塗料及びメタリツク塗
料の種類の如何に拘らずに、単一の塗装機で静電
塗装できるようにした静電塗装装置を提供するこ
とを目的とするものである。 The present invention has been developed in view of the drawbacks of the prior art, and is an electrostatic coating system that enables electrostatic coating with a single coating machine, regardless of the type of solvent-based paint, water-based paint, or metallic paint. The purpose is to provide a device.

［課題を解決するための手段］ 前記課題を解決するために、第１の考案が採用
する構成は、内部に回転軸を駆動するエアモータ
を有する筒状のハウジングと、該ハウジングの先
端側に位置して回転軸に取り付けられ、水系塗
料、メタリツク塗料及び溶剤系塗料の何れかが選
択的に供給されることにより当該塗料を回転霧化
する回転霧化頭と、該回転霧化頭の径方向外方に
位置し前記ハウジングの軸方向に進退自在に設け
られた外部電極と、前記回転霧化頭に水系塗料又
はメタリツク塗料が供給されるときには該外部電
極を前記ハウジングの先端側へ進出させ、前記回
転霧化頭に溶剤系塗料が供給されるときには該外
部電極を後退させるアクチユエータと、高電圧を
発生させる高電圧発生装置と、前記回転霧化頭に
水系塗料又はメタリツク塗料が供給されるときに
は該高電圧発生装置を前記外部電極に接続し、前
記回転霧化頭に溶剤系塗料が供給させるときに該
高電圧発生装置を回転霧化頭に接続する切換スイ
ツチとを備えてなるものである。[Means for Solving the Problems] In order to solve the above problems, the configuration adopted in the first invention includes a cylindrical housing having an air motor therein that drives a rotating shaft, and a cylindrical housing located on the distal end side of the housing. a rotating atomizing head that is attached to a rotating shaft and selectively supplies water-based paint, metallic paint, or solvent-based paint to rotationally atomize the paint; and a radial direction of the rotating atomizing head. an external electrode located outside and movable in the axial direction of the housing, and when water-based paint or metallic paint is supplied to the rotating atomizing head, the external electrode is advanced to the tip side of the housing; an actuator for retracting the external electrode when a solvent-based paint is supplied to the rotary atomizing head; a high-voltage generator that generates a high voltage; and when a water-based paint or metallic paint is supplied to the rotary atomizing head. The high voltage generator is connected to the external electrode, and the high voltage generator is connected to the rotary atomizer head when solvent-based paint is supplied to the rotary atomizer head. .

又、第２の考案が採用する構成は、前記第１の
考案において、ハウジングの外側には該ハウジン
グを覆う円筒状のカバーを設け、該カバーには電
極支持部材を該カバーの軸方向へ進退自在に設
け、前記電極支持部材の先端側に外部電極を設
け、前記カバーの後端に取付けられたブラケツト
には前記アクチユエータを設け、該アクチユエー
タを前記電極支持部材に連結し、該アクチユエー
タによつて前記外部電極を進退駆動するようにし
たものである。 Further, the configuration adopted in the second invention is that in the first invention, a cylindrical cover is provided on the outside of the housing to cover the housing, and the electrode support member is moved back and forth in the axial direction of the cover. an external electrode is provided on the tip side of the electrode support member, the actuator is provided on a bracket attached to the rear end of the cover, the actuator is connected to the electrode support member, and the actuator is connected to the electrode support member; The external electrode is driven forward and backward.

［作用］ 先ず、第１の考案において、溶剤系塗料を静電
塗装するとする。この場合、アクチユエータが外
部電極を後退させると共に、切換スイツチにより
高電圧発生装置をハウジングと回転霧化頭に接続
する。これにより、前記回転霧化頭に供給される
溶剤系塗料は該回転霧化頭において帯電霧化し、
帯電塗料粒子は該回転霧化頭から被塗物に至る電
気力線に沿つて飛行して、前記被塗物に静電塗着
する。[Operation] First, in the first idea, it is assumed that a solvent-based paint is applied electrostatically. In this case, the actuator retracts the external electrode and the changeover switch connects the high voltage generator to the housing and the rotating atomizing head. As a result, the solvent-based paint supplied to the rotating atomizing head is charged and atomized in the rotating atomizing head,
The charged paint particles fly along the lines of electric force from the rotary atomizing head to the object to be coated, and are electrostatically deposited on the object to be coated.

次に、水系塗料またはメタリツク塗料を静電塗
装するとする。この場合、アクチユエータが外部
電極を前進させると共に、切換スイツチにより高
電圧発生装置を該外部電極に接続する。これによ
り、回転霧化頭に供給された水系塗料又はメタリ
ツク塗料は該回転霧化頭で霧化され、霧化された
塗料は外部電極によりコロナ放電領域で帯電し、
電気力線に沿つて飛行して被塗物に静電塗着す
る。 Next, assume that water-based paint or metallic paint is applied electrostatically. In this case, the actuator advances the external electrode, and the changeover switch connects the high voltage generator to the external electrode. As a result, the water-based paint or metallic paint supplied to the rotating atomizing head is atomized by the rotating atomizing head, and the atomized paint is charged in the corona discharge area by the external electrode.
It flies along the lines of electric force and electrostatically coats the object to be coated.

第２の考案にあつては、前述の第１の考案にお
いて、外部電極は電極支持部材に取付けられた状
態で、ブラケツトに設けられたアクチユエータに
よつてカバーの軸方向へ進退して被塗物に接離す
る。 In the second invention, in the first invention described above, the external electrode is moved forward and backward in the axial direction of the cover by an actuator provided on the bracket while being attached to the electrode support member, and is moved to the object to be coated. come into contact with and separate from it.

［実施例］ 以下に本考案の実施例について第１図及び第２
図に基ずいて説明する。[Example] Examples of the present invention are shown below in Figures 1 and 2.
This will be explained based on the diagram.

１１は本実施例による塗装機本体で、該塗装機
本体１１は従来技術と同様に内部にエアモータと
該エアモータによつて回転せしめられる回転軸と
を有するハウジング（いずれも図示せず）と、該
ハウジングを覆つている絶縁性部材からなる円筒
状のカバー１２と、該カバー１２の先端側に位置
して前記回転軸に取り付けられ、エアモータによ
つて回転せしめられる回転霧化頭１３とからな
り、前記ハウジングの基端側にはインシユレート
サポートとしてのブラケツト１４が設けられ、該
塗装機本体１１は該ブラケツト１４を介してレシ
プロケータ等に取り付けられるようになつてい
る。 Reference numeral 11 denotes the main body of the spraying machine according to the present embodiment, and the main body 11 of the spraying machine includes a housing (none of which is shown) having an air motor and a rotating shaft rotated by the air motor inside, as in the prior art. It consists of a cylindrical cover 12 made of an insulating member that covers the housing, and a rotating atomizing head 13 located at the tip side of the cover 12 and attached to the rotating shaft and rotated by an air motor, A bracket 14 as an insulating support is provided on the base end side of the housing, and the sprayer main body 11 is attached to a reciprocator or the like via the bracket 14.

１５は前記塗装機本体１１に接続された塗料供
給管、１６は該塗料供給管１５を介して回転霧化
頭１３に複数色の塗料を選択して供給する色替弁
装置で、該色替弁装置１６はＡ色、Ｂ色、…Ｎ色
の水系塗料を供給するＮ個の水系塗料用塗料弁１
７Ａ，１７Ｂ，…１７Ｎと、ａ色、ｂ色、…ｎ色
の溶剤系塗料を供給するｎ個の溶剤系塗料用塗料
弁１８ａ，１８ｂ，…１８ｎと、洗浄用シンナを
供給するシンナ弁１９と、洗浄用空気を供給する
エア弁２０とから構成されている。 15 is a paint supply pipe connected to the paint sprayer body 11; 16 is a color change valve device which selects and supplies a plurality of colors of paint to the rotary atomizing head 13 through the paint supply pipe 15; The valve device 16 includes N paint valves 1 for water-based paints that supply water-based paints of colors A, B, ...N.
7A, 17B, . . . 17N, n paint valves 18a, 18b, . . . 18n for solvent-based paints that supply solvent-based paints of colors a, b, . and an air valve 20 that supplies cleaning air.

２１，２１，…は外部電極で、該各外部電極２
１は針状に形成され、前記カバー１２の軸方向へ
進退自在に設けられた電極支持部材２２に取付け
られている。即ち、前記電極支持部材２２は、前
記カバー１２の先端側外周に隙間Ｐを開けて嵌装
されて、前記外部電極２１が前記カバー１２の先
端側を囲むように周方向へ間欠的に取り付けられ
た導電性の電極取付リング２３と、カバー１２の
後端側に配設され、取付片２４ａが内側へ延設さ
れた連結リング２４と、これら両リング２３，２
４を連結して前記カバー１２の軸心と並行に配設
された一対の連結杆２５，２５とから構成され
る。前記各連結杆２５は前記カバー１２の外周に
取り付けられたガイドリング２６の挿通孔に挿通
され、前記カバー１２の軸方向への進退がガイド
されるようになつている。 21, 21, ... are external electrodes, and each external electrode 2
1 is formed into a needle shape and is attached to an electrode support member 22 that is provided to be movable forward and backward in the axial direction of the cover 12. That is, the electrode support member 22 is fitted to the outer periphery of the cover 12 on the front end side with a gap P, and the external electrode 21 is attached intermittently in the circumferential direction so as to surround the front end side of the cover 12. a conductive electrode mounting ring 23, a connecting ring 24 disposed on the rear end side of the cover 12 and having a mounting piece 24a extending inward, and both rings 23, 2.
4 and a pair of connecting rods 25, 25 arranged parallel to the axis of the cover 12. Each of the connecting rods 25 is inserted into an insertion hole of a guide ring 26 attached to the outer periphery of the cover 12, so that the cover 12 is guided to move forward and backward in the axial direction.

２７は前記電極支持部材２２と共に外部電極２
１を進退させるアクチユエータとしてのエアシリ
ンダで、該エアシリンダに２７はカバー１２から
延設された前述のブラケツト１４に取り付けら
れ、そのロツド２７ａ先端は螺子部となつて前記
連結リング２４の取付片２４ａに固着されてい
る。前記ロツド２７ａは圧気源２８から前記エア
シリンダ２７内に給排される圧気により伸縮動す
るもので、前記外部電極２１は前記ロツド２７ａ
のストローク分だけ前記カバー１２の軸方向へ進
退することができる。 27 is the external electrode 2 together with the electrode support member 22.
An air cylinder 27 is attached to the above-mentioned bracket 14 extending from the cover 12, and the tip of the rod 27a is a threaded portion and is connected to the mounting piece 24a of the connecting ring 24. is fixed to. The rod 27a expands and contracts with the pressure air supplied and discharged from the pressure air source 28 into the air cylinder 27, and the external electrode 21 moves along the rod 27a.
The cover 12 can be moved back and forth in the axial direction by a stroke of .

２９，３０，３１は高電圧ケーブル、３２は、
入力側が前記高電圧ケーブル２９を介して高電圧
発生装置７に接続され、出力側が前記高電圧ケー
ブル３０，３１を介して前記回転霧化頭１３、外
部電極２１にそれぞれ接続させる切換スイツチ
で、該切換スイツチ３２は一端がアースされたア
ース用接点３３，３４と、これら両アース用接点
３３，３４を挟んで設けられ、一端が高電圧ケー
ブル２９を介して前記高電圧発生装置７に接続さ
れた電源用接点３６と、一端が高電圧ケーブル３
０を介してハウジングに接続され他端がアース用
接点３３と電源用接点３６とに接離する可動接点
３７と、一端が高電圧ケーブル３１を介して前記
電極取付リング２３に接続され他端が電源用接点
３６とアース用接点３４とに接離する可動接点３
８とを有し、両可動接点３７，３８は前記エアシ
リンダ２７のロツド２７ａの動きに連動してい
る。即ち、前記ロツド２７ａがエアシリンダ２７
内から伸長したとき、換言すれば外部電極２１が
第２図中の実線で示す如く前進したときに第１図
中実線で示す如く可動接点３８が電源用接点３６
に接続されて可動接点３７がアース用接点３３に
接続され、又、ロツド２７ａによつて外部電極２
１が第２図の二点鎖線で示す位置に後退したとき
に、第１図中一点鎖線で示す如く可動接点３７が
電源用接点３６に接続されて可動接点３８が二点
鎖線で示す如くアース用接点３４に接続されるも
のである。 29, 30, 31 are high voltage cables, 32 is
A changeover switch whose input side is connected to the high voltage generator 7 via the high voltage cable 29 and whose output side is connected to the rotary atomizing head 13 and the external electrode 21 via the high voltage cables 30 and 31, respectively. The changeover switch 32 is provided with grounding contacts 33 and 34 whose one end is grounded, and which are sandwiched between the two grounding contacts 33 and 34, and whose one end is connected to the high voltage generator 7 via a high voltage cable 29. Power supply contact 36 and one end connected to high voltage cable 3
A movable contact 37 is connected to the housing through a high voltage cable 31 and the other end is connected to the earth contact 33 and the power contact 36, and the other end is connected to the electrode mounting ring 23 through the high voltage cable 31. A movable contact 3 that connects and separates from the power supply contact 36 and the ground contact 34
8, and both movable contacts 37, 38 are interlocked with the movement of the rod 27a of the air cylinder 27. That is, the rod 27a is the air cylinder 27.
When the external electrode 21 is extended from the inside, in other words, when the external electrode 21 moves forward as shown by the solid line in FIG.
The movable contact 37 is connected to the grounding contact 33, and the external electrode 2 is connected to the ground by the rod 27a.
1 retreats to the position shown by the two-dot chain line in FIG. 2, the movable contact 37 is connected to the power supply contact 36 as shown by the one-dot chain line in FIG. It is connected to the contact point 34.

本実施例にかかる静電塗装装置はこのように構
成されるが、次にその作用について説明する。 The electrostatic coating apparatus according to this embodiment is constructed as described above, and its operation will be explained next.

先ず、水系塗料又はメタリツク塗料の塗装につ
いて説明する。この場合、圧気源２８からエアシ
リンダ２７内に圧気を供給して該エアシリンダ２
７のロツド２７ａを前進させることにより、第２
図中実線で示す如く外部電極２１をカバー１２の
軸方向先端側へ前進させて、被塗物８に接近させ
る。これに伴い、前記エアシリンダ２７の動きに
連動して、切換スイツチ３２が高電圧発生装置７
を前記外部電極２１に接続させる。これにより第
２図中一点鎖線で示す如く前記外部電極２１から
被塗物８に至る電気力線Ｓが発生する。次に、エ
アモータを駆動して回転軸を回転させ、回転霧化
頭１３が高速回転する。この状態で、色替弁装置
１６に設けた水系塗料弁１７Ａ〜１７Ｎの内の一
の塗料弁を開弁し、塗料供給管１５を介して回転
霧化頭１３に塗料を供給する。これにより水系塗
料又はメタリツク塗料が霧化して微粒子化する。
そして、塗料粒子は外部電極２１の周囲に形成さ
れるコロナ放電領域を通過する間に帯電し、この
帯電粒子は前記電気力線Ｓに沿つて飛行し、被塗
物８に静電塗着される。この場合において回転霧
化頭１３と被塗物８との間の距離は通常200〜300
mmであり、いま電極支持部材２２による外部電極
２１のストロークを100〜150mmとすると、該外部
電極２１を前進させた場合には、外部電極２１と
被塗物８との間が接近する。この結果、外部電極
２１と被塗物８との間の電界が強まり、総ての塗
料粒子は電気力線Ｓに沿つて一斉に被塗物８に向
けて飛行することができるために、カバー１２の
先端側において浮遊することがなく、該カバー１
２を汚損することない。 First, coating with water-based paint or metallic paint will be explained. In this case, pressurized air is supplied from the pressurized air source 28 into the air cylinder 27 so that the air cylinder 2
By advancing the rod 27a of No. 7, the second rod 27a is moved forward.
As shown by the solid line in the figure, the external electrode 21 is advanced toward the axial end of the cover 12 to approach the object 8 to be coated. Accordingly, in conjunction with the movement of the air cylinder 27, the changeover switch 32 is switched to the high voltage generator 7.
is connected to the external electrode 21. As a result, lines of electric force S are generated from the external electrode 21 to the object to be coated 8, as shown by the dashed line in FIG. Next, the air motor is driven to rotate the rotary shaft, and the rotary atomizing head 13 rotates at high speed. In this state, one of the water-based paint valves 17A to 17N provided in the color change valve device 16 is opened to supply paint to the rotary atomizing head 13 via the paint supply pipe 15. This atomizes the water-based paint or metallic paint into fine particles.
The paint particles are charged while passing through the corona discharge region formed around the external electrode 21, and these charged particles fly along the electric lines of force S and are electrostatically applied to the object 8 to be coated. Ru. In this case, the distance between the rotary atomizing head 13 and the object to be coated 8 is usually 200 to 300.
mm, and if the stroke of the external electrode 21 by the electrode support member 22 is 100 to 150 mm, when the external electrode 21 is moved forward, the external electrode 21 and the object 8 to be coated will approach each other. As a result, the electric field between the external electrode 21 and the object to be coated 8 is strengthened, and all the paint particles can fly toward the object to be coated 8 along the lines of electric force S at the same time. The cover 1 does not float on the tip side of the cover 12.
No contamination of 2.

次に、溶剤系塗料の塗装について説明する。 Next, coating with a solvent-based paint will be explained.

この場合、エアシリンダ２７のロツド２７ａを
後退させることにより、外部電極２１を第２図中
二点鎖線で示す如くカバー１２の軸方向へ後退さ
せる。これに伴い、エアシリンダ２７の動きに連
動して、切換スイツチ３２が高電圧発生装置７を
ハウジングに接続する。これにより、回転霧化頭
１３に高電圧が印加され、第２図中二点鎖線で示
す如く、該回転霧化頭１３から被塗物８に至る電
気力線Ｓが発生する。次に、エアモータを駆動し
て回転霧化頭１３を高速回転させる。この状態
で、色替弁装置１６に設けた溶剤系塗料用塗料弁
１８ａ〜１８ｎの内の一の塗料弁を開弁し、塗料
を供給することにより、この溶剤系塗料が帯電霧
化し、電気力線Ｓに沿つて飛行して被塗物８に静
電塗着される。 In this case, by retracting the rod 27a of the air cylinder 27, the external electrode 21 is retracted in the axial direction of the cover 12 as shown by the two-dot chain line in FIG. Accordingly, in conjunction with the movement of the air cylinder 27, the changeover switch 32 connects the high voltage generator 7 to the housing. As a result, a high voltage is applied to the rotary atomizing head 13, and lines of electric force S are generated from the rotary atomizing head 13 to the object to be coated 8, as shown by the two-dot chain line in FIG. Next, the air motor is driven to rotate the rotary atomizing head 13 at high speed. In this state, by opening one of the paint valves 18a to 18n for solvent-based paint provided in the color change valve device 16 and supplying paint, this solvent-based paint is charged and atomized, and is electrically charged. It flies along the line of force S and is electrostatically applied to the object 8 to be coated.

然るに、この場合においては、外部電極２１が
後退するので、回転霧化頭１３によつて霧化した
帯電塗料粒子がカバー１２の後方へ浮遊して回り
込んだとしても外部電極２１に付着し難く、当該
外部電極２１を汚損することがない。 However, in this case, since the external electrode 21 is retracted, even if the charged paint particles atomized by the rotating atomizing head 13 float behind the cover 12 and go around, they are less likely to adhere to the external electrode 21. , the external electrode 21 is not contaminated.

又、電極支持部２２の電極取付リング２３とカ
バー１２との間に隙間Ｐが形成されているので、
回転霧化頭１３の回転によるエアポンピング現象
で、カバー１２の後方から先端側へ向けての気流
Ｋが該隙間Ｐを流通することができる。この結
果、当該気流Ｋにより塗料粒子は前方へ押圧され
ることができ、従つて、該塗料粒子によるカバー
１２等の汚損が一層防止される。即ち、前記隙間
Ｐがない場合には、エアポンピング現象による気
流Ｘは、第２図中に点線で示す如く、電極取付リ
ング２３の外周を乗り越えることになりカバー１
２の先端側には渦Ｆが生じて塗料粒子を巻き込ん
でカバー１２付着させるが、本実施例ではこのよ
うな現象を防止することができる。 Furthermore, since a gap P is formed between the electrode mounting ring 23 of the electrode support part 22 and the cover 12,
Due to the air pumping phenomenon caused by the rotation of the rotary atomizing head 13, an airflow K from the rear of the cover 12 toward the front end can flow through the gap P. As a result, the paint particles can be pushed forward by the air flow K, and therefore, staining of the cover 12 and the like by the paint particles can be further prevented. That is, if there is no gap P, the airflow X due to the air pumping phenomenon will go over the outer periphery of the electrode attachment ring 23, as shown by the dotted line in FIG.
Although a vortex F is generated on the tip side of the cover 12 and draws in paint particles and causes them to adhere to the cover 12, this embodiment can prevent such a phenomenon.

尚、実施例ではエアシリンダ２７をブラケツト
１４に取付ける構成としたが、カバー１２に取付
けてもよい。 In the embodiment, the air cylinder 27 is attached to the bracket 14, but it may be attached to the cover 12.

又、実施例では外部電極２１が取付けられた電
極支持部材２２を、ガイドリング２６により進退
可能に支持したが、該ガイドリング２６を設けず
に、該電極支持部材２２をエアシリンダ２７のロ
ツド２７ａによつて所謂片持ち状態で支持するよ
うにしてもよい。 Further, in the embodiment, the electrode support member 22 to which the external electrode 21 is attached is supported movably by the guide ring 26, but the electrode support member 22 is supported by the rod 27a of the air cylinder 27 without providing the guide ring 26. It may also be supported in a so-called cantilevered state.

更に、前記ガイドリング２６を絶縁性部材で形
成すれば、カバー１２を省略して該ガイドリング
２６をハウジングに直接取付ける構成とすること
ができる。 Furthermore, if the guide ring 26 is formed of an insulating material, the cover 12 can be omitted and the guide ring 26 can be directly attached to the housing.

［考案の効果］ 以上説明した如く、本考案によれば溶剤系塗料
と水系塗料又はメタリツク塗料とを単一の静電塗
装装置によつて塗装することができるので、塗装
ラインの構成を簡略化でき、購入コストを低減
し、設置スペースを小さくすることができる。
又、水系塗料又はメタリツク塗料の塗装時におい
ては、外部電極を前進させて、該外部電極に電圧
を印加する構成としたから、外部電極と被塗装物
との間に強い電界が形成され、総ての塗料粒子が
前方へ飛行して後方へ回り込むことがなくなり、
カバー、ハウジング、外部電極等の汚損を防止し
うる。更に、溶剤系塗料の塗装時においては外部
電極を後退させるので、溶剤系塗料粒子が後方へ
回り込んでも、溶剤系塗料の塗装時に外部電極が
汚損することがない。[Effects of the invention] As explained above, according to the invention, solvent-based paint and water-based paint or metallic paint can be applied using a single electrostatic coating device, which simplifies the configuration of the painting line. It is possible to reduce the purchase cost and the installation space.
In addition, when applying water-based paint or metallic paint, the external electrode is moved forward and a voltage is applied to the external electrode, so a strong electric field is formed between the external electrode and the object to be coated, resulting in a total All paint particles will no longer fly forward and wrap around backwards.
This prevents the cover, housing, external electrodes, etc. from becoming contaminated. Furthermore, since the external electrode is moved back when applying the solvent-based paint, even if the solvent-based paint particles go around to the rear, the external electrode will not be contaminated during the application of the solvent-based paint.

【図面の簡単な説明】[Brief explanation of drawings]

第１図及び第２図は本考案の実施例に係り、第
１図は静電塗装装置の外観斜視図、第２図は動作
を説明する静電塗装装置の側面図、第３図及び第
４図は従来技術に係り、第３図は溶剤系塗料用静
電塗装装置の側面図、第４図は水系塗料用静電塗
装装置の側面図である。 １……ハウジング、２……エアモータ、１３…
…回転霧化頭、７……高電圧発生装置、２１……
外部電極、２７……アクチユエータ（エアシリン
ダ）、３２……切換スイツチ。 1 and 2 relate to an embodiment of the present invention; FIG. 1 is an external perspective view of an electrostatic coating device, FIG. 2 is a side view of the electrostatic coating device for explaining the operation, and FIGS. 4 relates to the prior art, FIG. 3 is a side view of an electrostatic coating device for solvent-based paint, and FIG. 4 is a side view of an electrostatic coating device for water-based paint. 1...Housing, 2...Air motor, 13...
...Rotating atomization head, 7...High voltage generator, 21...
External electrode, 27... actuator (air cylinder), 32... changeover switch.

Claims (1)

【実用新案登録請求の範囲】 (1) 内部に回転軸を駆動するエアモータを有する
筒状のハウジングと、該ハウジングの先端側に
位置して回転軸に取り付けられ、水系塗料、メ
タリツク塗料及び溶剤系塗料の何れかが選択的
に供給されることにより当該選択された塗料を
回転霧化する回転霧化頭と、該回転霧化頭の径
方向外方に位置し前記ハウジングの軸方向に進
退自在に設けられた外部電極と、前記回転霧化
頭に水系塗料又はメタリツク塗料が供給される
ときには該外部電極を前記ハウジングの先端側
へ進出させ、前記回転霧化頭に溶剤系塗料が供
給されるときには該外部電極を後退させるアク
チユエータと、高電圧を発生させる高電圧発生
装置と、前記回転霧化頭に水系塗料又はメタリ
ツク塗料が供給されるときには該高電圧発生装
置を前記外部電極に接続し、前記回転霧化頭に
溶剤系塗料が供給させるときに該高電圧発生装
置を回転霧化頭に接続する切換スイツチとを備
えてなる静電塗装装置。 (2) 前記ハウジングの外側には該ハウジングを覆
う円筒状のカバーを設け、該カバーには電極支
持部材を該カバーの軸方向へ進退自在に設け、
該電極支持部材の先端側に前記外部電極を設
け、前記カバーの後端に取付けられたブラケツ
トには前記アクチユエータを設け、該アクチユ
エータを前記電極支持部材に連結し、該アクチ
ユエータによつて前記外部電極を進退駆動する
ように構成した実用新案登録請求の範囲第(1)項
に記載の静電塗装装置。[Claims for Utility Model Registration] (1) A cylindrical housing having an air motor inside that drives a rotating shaft; a rotating atomizing head that rotationally atomizes the selected paint by selectively supplying the paint, and a rotary atomizing head that is located radially outward of the rotary atomizing head and is movable in the axial direction of the housing. When water-based paint or metallic paint is supplied to the rotary atomizing head, the external electrode is advanced to the tip side of the housing, and the solvent-based paint is supplied to the rotary atomizing head. Sometimes, an actuator for retracting the external electrode, a high voltage generator for generating a high voltage, and when water-based paint or metallic paint is supplied to the rotating atomizing head, the high voltage generator is connected to the external electrode, An electrostatic coating device comprising: a switch for connecting the high voltage generator to the rotary atomizer head when a solvent-based paint is supplied to the rotary atomizer head. (2) A cylindrical cover covering the housing is provided on the outside of the housing, and an electrode support member is provided on the cover so as to be movable in the axial direction of the cover,
The external electrode is provided on the tip side of the electrode supporting member, the actuator is provided on the bracket attached to the rear end of the cover, the actuator is connected to the electrode supporting member, and the external electrode is connected to the external electrode by the actuator. An electrostatic coating device according to claim (1) of the utility model registration, which is configured to move forward and backward.