JPH09220498A - Rotary atomizing electrostatic coating device - Google Patents
Rotary atomizing electrostatic coating deviceInfo
- Publication number
- JPH09220498A JPH09220498A JP8026547A JP2654796A JPH09220498A JP H09220498 A JPH09220498 A JP H09220498A JP 8026547 A JP8026547 A JP 8026547A JP 2654796 A JP2654796 A JP 2654796A JP H09220498 A JPH09220498 A JP H09220498A
- Authority
- JP
- Japan
- Prior art keywords
- air
- paint
- rotary atomizing
- atomizing head
- cleaning
- 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.)
- Pending
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
- B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
- B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
- B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
- B05B3/1007—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member
- B05B3/1014—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces characterised by the rotating member 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
- 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
- B05B3/1092—Means for supplying shaping gas
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、回転霧化静電塗装
装置に関し、とくに回転軸中空部に入っている塗料・洗
浄剤侵入防止エアによる、塗料の回転霧化頭での微粒化
不良発生を抑制できる回転霧化静電塗装装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary atomizing electrostatic coating apparatus, and more particularly, to defective atomization of a paint at a rotary atomizing head due to paint / cleaner intrusion prevention air contained in a hollow portion of a rotary shaft. The present invention relates to a rotary atomizing electrostatic coating device capable of suppressing the above.
【０００２】[0002]
【従来の技術】空気軸受によって回転自在に支持された
回転軸の中空部に、複数本の塗料ノズルと、回転軸の先
端部に取りつけられた回転霧化頭を洗浄するための洗浄
剤供給管とが配置される回転霧化静電塗装装置は知られ
ている。従来装置では、塗料、洗浄剤が空気軸受に侵入
して回転不具合を起こすことを防止するために、および
塗料が塗料フィードチューブ先端部の外面に付着しそれ
がやがて被塗装面上に落下して塗装不良を起こすことを
防止するために、塗料、洗浄剤が回転軸受内へ逆流する
ことを防止しなければならない。特開平７−１７１４８
３公報は、塗装時、あるいは洗浄時（塗料フィードチュ
ーブ内の洗浄時）に、エア供給経路と兼用される側の洗
浄剤経路（塗料フィードチューブ内を洗浄する洗浄剤経
路とは別の経路）を通して圧縮エアを流し、回転軸中空
部の圧力を高め、（空気軸受への軸受エアの一部が回転
軸中空部に洩れて入り回転軸中空部の圧力を高めること
もあるが、洗浄剤通路を通しての圧縮エアによる回転軸
中空部圧力上昇にくらべて小さい、）それによって塗装
時に塗料が、洗浄時に洗浄剤（塗料フィードチューブ内
を洗浄する洗浄剤）が、回転軸内に侵入することを防止
する塗料・洗浄剤の逆流防止方法を開示している。2. Description of the Related Art A plurality of paint nozzles are provided in a hollow portion of a rotary shaft rotatably supported by an air bearing, and a cleaning agent supply pipe for cleaning a rotary atomizing head attached to the tip of the rotary shaft. Rotary atomizing electrostatic coating devices in which and are arranged are known. In the conventional device, in order to prevent the paint and detergent from entering the air bearing and causing a rotation failure, and the paint adheres to the outer surface of the tip of the paint feed tube, which eventually falls onto the surface to be coated. In order to prevent paint failure, it is necessary to prevent the paint and cleaning agent from flowing back into the rotary bearing. Japanese Patent Laid-Open No. 7-17148
No. 3 gazette discloses a cleaning agent path that is also used as an air supply path during coating or cleaning (when cleaning the inside of the paint feed tube) (a path different from the cleaning agent path that cleans the inside of the paint feed tube). Through the compressed air to increase the pressure in the hollow part of the rotating shaft (some of the bearing air to the air bearing may leak into the hollow part of the rotating shaft and increase the pressure in the hollow part of the rotating shaft. It is smaller than the pressure rise in the hollow part of the rotating shaft due to compressed air through the), thereby preventing the paint during painting and the cleaning agent (cleaning agent for cleaning the paint feed tube) during cleaning from entering the rotating shaft. Disclosed is a method for preventing backflow of paints and cleaning agents.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来方法で
は、つぎの問題がある。 図３に示すように、回転軸内中空部１６´に入って
圧縮エア（塗料・洗浄剤侵入防止エア）は、本来は塗料
しか通らない霧化頭の塗料噴出孔１５´や、塗装中に塗
料が噴出してはならないセルフクリーニング経路１４´
を通って、大気中へと抜けていかざるを得ない。そのた
め、塗装中に塗料の一部が塗料噴出孔１５´を通るエア
と一緒になって前方に噴出されてしまい、あるいはセル
フクリーニング経路１４´を通るエアと一緒になって前
方に噴出されてしまう。その結果、塗料の一部は霧化頭
表面を伝って霧化頭エッジ部から飛散、微粒化されるこ
とができなくなり、微粒化不良の塗料が多量に発生し、
塗装品質不具合を引き起こす。 また、エアを巻き込んだ一部の塗料は泡となって被
塗装物に付着し、塗装不良を引き起こすこともある。こ
れらの塗装不具合の発生を防止するために、エアの供給
を止めると、回転軸内への塗料、洗浄剤の逆流が生じ
る。本発明の目的は、回転軸の中空部に入った塗料・洗
浄剤侵入防止エアによる、塗料の回転霧化頭での微粒化
不良およびエアの巻き込みの発生を抑制できる回転霧化
静電塗装装置を提供することにある。However, the conventional method has the following problems. As shown in FIG. 3, compressed air (paint / cleaning agent intrusion prevention air) entering the hollow portion 16 'in the rotary shaft is originally the paint spray hole 15' of the atomizing head through which only the paint passes, and during coating. Self-cleaning path 14 'where paint should not squirt
There is no choice but to escape through the atmosphere into the atmosphere. Therefore, during painting, a part of the paint is jetted forward together with the air passing through the paint jetting hole 15 ', or is jetted forward together with the air passing through the self-cleaning path 14'. . As a result, a part of the paint cannot be atomized by being sprayed from the atomizing head edge part along the atomizing head surface, and a large amount of paint with poor atomization occurs.
Causes paint quality problems. In addition, a part of the paint containing the air may become bubbles and adhere to the object to be coated, resulting in poor coating. If the supply of air is stopped in order to prevent the occurrence of these coating defects, backflow of the paint and cleaning agent into the rotary shaft occurs. An object of the present invention is to provide a rotary atomizing electrostatic coating device capable of suppressing the occurrence of atomization defects and air entrainment at the rotary atomizing head of the paint due to the paint / cleaner intrusion prevention air that has entered the hollow portion of the rotary shaft. To provide.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成する本発
明はつぎの通りである。中空部を有する回転軸と、前記
回転軸中空部に連通し、該中空部に入っている塗料・洗
浄剤侵入防止用エアの一部を前記中空部から抜くため
の、回転霧化頭に形成された塗料噴出孔およびセルフク
リーニング経路以外の、エア抜き経路と、を有する回転
霧化静電塗装装置。The present invention to achieve the above object is as follows. Formed on a rotary atomizing head that communicates with a rotary shaft having a hollow portion and the hollow portion of the rotary shaft to remove a part of paint / cleaning agent intrusion prevention air contained in the hollow portion from the hollow portion. Rotary atomizing electrostatic coating device having an air bleeding path other than the sprayed paint ejection hole and the self-cleaning path.
【０００５】上記本発明の装置では、エア抜き通路を設
けたことにより、回転軸中空部の圧力上昇が抑えられ、
塗料噴出孔やセルフクリーニング経路からエアが勢いよ
く噴出されることがなくなり、塗料は殆どすべて回転霧
化頭内面を伝ってエッジ部に至りそこから飛散、微粒化
されるので、微粒化不良が生じなくなる。また、塗料噴
出孔やセルフクリーニング経路からエアが勢いよく噴出
されることがなくなることによって、塗料のエア巻き込
みも無視できる程度になり、エア巻き込みによる塗装不
良も生じなくなる。In the above-mentioned device of the present invention, since the air vent passage is provided, the pressure rise in the hollow portion of the rotary shaft is suppressed,
Air does not blow out vigorously from the paint ejection hole or the self-cleaning path, and almost all the paint travels along the inner surface of the rotary atomizing head to the edge part where it is scattered and atomized, resulting in poor atomization. Disappear. Further, since the air is not vigorously ejected from the paint ejection hole or the self-cleaning path, the air entrainment of the paint becomes negligible, and the coating failure due to the air entrainment does not occur.
【０００６】[0006]
【発明の実施の形態】図１は本発明の第１実施例の回転
霧化静電塗装装置を、図２は本発明の第２実施例の回転
霧化静電塗装装置を、それぞれ、示している。両実施例
に共通な部分には、両実施例にわたって同じ符号を付し
てある。まず、両実施例に共通な部分の構成を、図１を
参照して説明する。本発明実施例の回転霧化静電塗装装
置は、塗料を霧化する回転霧化頭１と、回転霧化頭１を
先端に取付け回転霧化頭１と一体に回転する中空の（中
空部１６を有する）回転軸３と、回転軸３を回転駆動す
るエアモーター２（回転軸３を回転自在に支持する空気
軸受を含む）と、回転軸３の中空部１６を通って回転霧
化頭１の内側まで延び回転霧化頭１に塗料を供給する少
なくとも１本の塗料フィードチューブ１１と、塗料フィ
ードチューブ１１の外周側に設けられた洗浄剤（シンナ
ー）およびエアの供給管１３と、回転霧化頭１の外周エ
ッジから半径方向外側に飛散する塗料に向けて前方にシ
ェーピングエアを噴出するエアノズル５を有するエアキ
ャップ４と、塗料に付与する高電圧を発生する高電圧発
生器７と、を有する。FIG. 1 shows a rotary atomizing electrostatic coating device according to a first embodiment of the present invention, and FIG. 2 shows a rotary atomizing electrostatic coating device according to a second embodiment of the present invention. ing. The parts common to both the embodiments are given the same reference numerals throughout the embodiments. First, the configuration of a portion common to both embodiments will be described with reference to FIG. The rotary atomizing electrostatic coating apparatus according to the embodiment of the present invention includes a rotary atomizing head 1 for atomizing a paint, and a hollow (hollow portion) which is attached to the tip of the rotary atomizing head 1 and rotates integrally with the rotary atomizing head 1. 16), an air motor 2 (including an air bearing that rotatably supports the rotating shaft 3) that rotationally drives the rotating shaft 3, and a rotary atomizing head through a hollow portion 16 of the rotating shaft 3. 1, at least one paint feed tube 11 for supplying paint to the rotary atomizing head 1, a cleaning agent (thinner) and air supply pipe 13 provided on the outer peripheral side of the paint feed tube 11, and rotation. An air cap 4 having an air nozzle 5 for ejecting shaping air forward toward the paint scattered radially outward from the outer peripheral edge of the atomizing head 1, a high voltage generator 7 for generating a high voltage applied to the paint, Have.
【０００７】塗料が導電性塗料の場合は、高電圧が塗料
供給経路を介してアースされるのを防止するために、電
気絶縁材のボデーに支持された外部電極６に高電圧（−
４０〜−６０ＫＶ）が印加され、外部電極６から飛散塗
料に電荷が付与される。また、塗料が非導電性塗料の場
合は、電気絶縁材のボデー内に高電圧発生器を配しそこ
から回転軸３を通して回転霧化頭１に電圧を印加する。When the paint is a conductive paint, in order to prevent the high voltage from being grounded via the paint supply path, a high voltage (-) is applied to the external electrode 6 supported by the body of the electric insulating material.
40 to −60 KV) is applied, and electric charge is applied to the scattered paint from the external electrode 6. When the paint is a non-conductive paint, a high voltage generator is arranged in the body of the electric insulating material, and a voltage is applied to the rotary atomizing head 1 through the rotary shaft 3 from the high voltage generator.
【０００８】回転霧化頭１は、塗料フィードチューブ１
１の先端に対向する壁部分の外周部に形成された塗料を
通す塗料噴出孔１５と、壁部分の中央部に形成された洗
浄剤を通すセルフクリーニング用経路１４と、を有す
る。塗料フィードチューブ１１には塗料タンク８からの
塗料がポンプ９によって送られる。ポンプ９と塗料フィ
ードチューブ１１との間には、オンオフバルブ１０が設
けられている。塗料のオンオフは、このバルブ１０の開
閉によって行われる。The rotary atomizing head 1 is a paint feed tube 1
1 has a coating material ejection hole 15 formed in the outer peripheral portion of the wall portion facing the tip of the first portion, and a self-cleaning path 14 formed in the central portion of the wall portion for passing the cleaning agent. The paint from the paint tank 8 is sent to the paint feed tube 11 by a pump 9. An on / off valve 10 is provided between the pump 9 and the paint feed tube 11. The paint is turned on and off by opening and closing the valve 10.
【０００９】その塗料供給経路の途中（ポンプ９と塗料
タンク８との間の部分）には、塗料フィードチューブ１
１内を洗浄する洗浄剤供給経路１９が切替バルブ２０を
介して接続しており、切替バルブ２０を洗浄剤供給経路
１９に切り替え、洗浄剤タンク２１からの洗浄剤をポン
プ９で吸引して塗料フィードチューブ１１に流し、塗料
フィードチューブ１１内を洗浄できるようになってい
る。塗料フィードチューブ１１の外周面と洗浄剤および
エアの供給管１３の内周面との間の通路には、回転霧化
頭１と塗料フィードチューブ１１の先端外周面とを洗浄
する洗浄剤と、回転軸３の中空部への塗料・洗浄剤の逆
流を防止する逆流防止用エアとを、選択的に流す洗浄剤
経路２２が接続されている。洗浄剤経路２２は洗浄剤タ
ンク２１に接続されている。洗浄剤経路２２の途中には
エアバルブ１２を介して圧縮エア供給経路２３が接続さ
れており、エアバルブ２３がオンの時に圧縮エア源（た
とえば、工場圧縮エア）からの圧縮エアが洗浄剤経路２
２に流れるようになっている。圧縮エア供給経路２３の
途中にはエアの圧力を適宜の圧力に減圧するレギュレー
タ２５が設けられている。In the middle of the paint supply path (the portion between the pump 9 and the paint tank 8), the paint feed tube 1
A cleaning agent supply path 19 for cleaning the inside of the No. 1 is connected via a switching valve 20, the switching valve 20 is switched to the cleaning agent supply path 19, and the cleaning agent from the cleaning agent tank 21 is sucked by the pump 9 to paint. The paint is supplied to the feed tube 11 so that the inside of the paint feed tube 11 can be washed. A cleaning agent for cleaning the rotary atomizing head 1 and the tip outer peripheral surface of the paint feed tube 11 is provided in a passage between the outer peripheral surface of the paint feed tube 11 and the inner peripheral surface of the cleaning agent and air supply pipe 13. A cleaning agent passage 22 for selectively flowing backflow preventing air for preventing backflow of the paint / cleaning agent into the hollow portion of the rotating shaft 3 is connected. The cleaning agent path 22 is connected to the cleaning agent tank 21. A compressed air supply path 23 is connected in the middle of the cleaning agent path 22 via the air valve 12, and when the air valve 23 is on, compressed air from a compressed air source (for example, factory compressed air) is supplied to the cleaning agent path 2.
It flows to 2. A regulator 25 for reducing the pressure of air to an appropriate pressure is provided in the middle of the compressed air supply path 23.
【００１０】回転軸３の中空部１６に連通し、中空部１
６に入って溜まっている塗料・洗浄剤侵入防止用エアの
一部を中空部１６から抜くための、回転霧化頭１に形成
された塗料噴出孔１５およびセルフクリーニング経路１
４以外の、エア抜き経路１７（本発明の第２実施例では
符号が１８となる）が、中空部１６に対して設けられて
いる。エア抜き経路１７は、洗浄剤およびエアの供給管
１３のエア吹きだし口から噴出した後に、エアの一部が
エア抜き経路１７を通って大気に抜ける位置に、設けら
れる。エアの残りは回転霧化頭１に形成された塗料噴出
孔１５およびセルフクリーニング経路１４を通って大気
に抜ける。洗浄剤およびエアの供給管１３のエア吹きだ
し口から噴出されるエアの圧力は供給管１３のエア吹き
だし口で１００ＫＰａ以下とされることが望ましい。こ
の圧力調整は、レギュレータ２５で行うことができる。
エア抜き経路１７の通路断面積は、中空部１６の過大な
圧力上昇を抑えるために、圧縮エアを供給する経路２
２、２３の通路断面積よりも大きくすることが望まし
い。The hollow portion 1 of the rotary shaft 3 communicates with the hollow portion 16 of the rotary shaft 3.
6 and a self-cleaning path 1 for spraying paint 15 formed in the rotary atomizing head 1 for removing a part of the paint / cleaning agent intrusion prevention air that has accumulated in 6 from the hollow portion 16.
An air bleeding path 17 (reference numeral 18 in the second embodiment of the present invention) other than 4 is provided in the hollow portion 16. The air bleeding path 17 is provided at a position where a part of the air passes through the air bleeding path 17 and is released into the atmosphere after being ejected from the air outlet of the cleaning agent and air supply pipe 13. The rest of the air passes through the paint ejection hole 15 formed in the rotary atomizing head 1 and the self-cleaning path 14 and escapes to the atmosphere. It is desirable that the pressure of the air ejected from the air outlet of the supply pipe 13 for the cleaning agent and the air is 100 KPa or less at the air outlet of the supply pipe 13. This pressure adjustment can be performed by the regulator 25.
The passage cross-sectional area of the air bleeding passage 17 is a passage 2 for supplying compressed air in order to suppress an excessive pressure rise in the hollow portion 16.
It is desirable to make it larger than the passage cross-sectional area of 2, 23.
【００１１】つぎに、本発明の各実施例に特有な構造を
説明する。本発明の第１実施例では、図１に示すよう
に、エア抜き経路１７はエアモーター２のすぐ後方に設
けられ、回転軸内中空部１６の後端から中空部１６に連
通し、ボデーを通って大気に開放している。本発明の第
２実施例では、図２に示すように、エア抜き経路１８は
回転霧化頭１の後部、または回転霧化頭１と回転軸３と
の連結部に形成された孔からなり、回転軸内中空部１６
の前端から中空部１６に連通し、回転霧化頭１とエアキ
ャップ４の隙間を介して大気に開放している。Next, the structure peculiar to each embodiment of the present invention will be described. In the first embodiment of the present invention, as shown in FIG. 1, the air bleeding path 17 is provided immediately behind the air motor 2 and communicates with the hollow portion 16 from the rear end of the hollow portion 16 in the rotating shaft to connect the body. It is open to the atmosphere through. In the second embodiment of the present invention, as shown in FIG. 2, the air bleeding path 18 comprises a hole formed in the rear portion of the rotary atomizing head 1 or in the connecting portion between the rotary atomizing head 1 and the rotary shaft 3. , Hollow part 16 in the rotary shaft
Is communicated with the hollow portion 16 from the front end thereof and is open to the atmosphere through a gap between the rotary atomizing head 1 and the air cap 4.
【００１２】つぎに、作用を説明する。本発明の第１実
施例と第２実施例に共通な作用について説明する。塗装
時には、塗料タンク８からの塗料が塗料フィードチュー
ブ１１を通して回転霧化頭１の内面に供給され（その時
は洗浄剤は供給されていない）、回転霧化頭１の塗料噴
出孔１５を通り、回転霧化頭１の内面を伝って回転霧化
頭１のエッジに至り、そこから飛散され、微粒化され
る。この時には、圧縮エア源２４からの圧縮エアが経路
２２を通して洗浄剤およびエアの供給管１３内に供給さ
れ、供給管１３の先端から噴出される。この噴出エアに
よって塗料の塗料フィードチューブ１１先端外周への付
着が防止される。洗浄には、経路１９を通して塗料フィ
ードチューブ１１内に洗浄剤を送る塗料フィードチュー
ブ１１内洗浄と、経路２２を通して洗浄剤およびエアの
供給管１３内に洗浄剤を送る回転霧化頭１洗浄とがあ
る。塗料フィードチューブ１１内洗浄では、塗料フィー
ドチューブ１１に洗浄剤を送るとともに、圧縮エア源２
４からの圧縮エアを経路２２を通して洗浄剤およびエア
の供給管１３内に供給する。回転霧化頭１洗浄では、圧
縮エア源２４からの圧縮エアの供給は停止される。Next, the operation will be described. An operation common to the first and second embodiments of the present invention will be described. At the time of coating, the paint from the paint tank 8 is supplied to the inner surface of the rotary atomizing head 1 through the paint feed tube 11 (the cleaning agent is not supplied at that time), passes through the paint spray hole 15 of the rotary atomizing head 1, It reaches the edge of the rotary atomizing head 1 through the inner surface of the rotary atomizing head 1, and is scattered and atomized from there. At this time, the compressed air from the compressed air source 24 is supplied into the cleaning agent and air supply pipe 13 through the path 22 and is jetted from the tip of the supply pipe 13. The jet air prevents the paint from adhering to the outer circumference of the tip of the paint feed tube 11. The cleaning includes cleaning the interior of the paint feed tube 11 that sends the cleaning agent into the paint feed tube 11 through the path 19, and cleaning the rotary atomizing head 1 that sends the cleaning agent into the supply tube 13 for the cleaning agent and air through the path 22. is there. In cleaning the inside of the paint feed tube 11, the cleaning agent is sent to the paint feed tube 11 and the compressed air source 2 is used.
Compressed air from No. 4 is supplied through the path 22 into the cleaning agent and air supply pipe 13. In the cleaning of the rotary atomizing head 1, the supply of compressed air from the compressed air source 24 is stopped.
【００１３】塗装時および塗料フィードチューブ１１内
洗浄において、噴出エアの一部は回転軸内中空部１６に
入って塗料・洗浄剤侵入防止エアとなり、残りは回転霧
化頭１の塗料噴出孔１５およびセルフクリーニング経路
１４を通って大気に抜ける。回転軸内中空部１６に入る
エアによって回転軸内中空部１６のエア圧は上がり、塗
料および洗浄剤（塗料フィードチューブ１１を通して流
れた洗浄剤）の回転軸内中空部１６への戻り（逆流）が
防止される。During coating and during cleaning of the interior of the paint feed tube 11, a part of the jet air enters the hollow portion 16 in the rotary shaft to serve as paint / cleaner intrusion prevention air, and the rest is the paint jet hole 15 of the rotary atomizing head 1. And escape to the atmosphere through the self-cleaning path 14. The air pressure in the hollow portion 16 in the rotary shaft increases due to the air entering the hollow portion 16 in the rotary shaft, and the paint and the cleaning agent (the cleaning agent flowing through the paint feed tube 11) return to the hollow portion 16 in the rotary shaft (backflow). Is prevented.
【００１４】ただし、回転軸内中空部１６に入ったエア
はエア抜き経路１７から抜けるので、回転軸内中空部１
６に入るエアによる回転軸内中空部１６の圧力上昇は従
来に比べて抑制される。そのため、回転霧化頭１の塗料
噴出孔１５およびセルフクリーニング経路１４を通って
大気に抜けるエア量は少なくなり、勢いも小さくなる。
その結果、塗装時に、エアが塗料を霧化頭内面に伝わら
せることなく前方に吹き飛ばすことがなくなり、かつ塗
料に巻き込まれるエア量が無視できる程度に少なくな
る。そのため、回転霧化頭１での塗料の微粒化不全、塗
装不良の発生が抑制される。塗料および洗浄剤の中空部
１６内への侵入防止効果は、圧縮エアの噴出口が塗料フ
ィードチューブ１１の塗料出口部付近にあり、吐出した
塗料がエアによって強制的に前方に押し出されるので、
十分に確保される。塗料出口から吹き出すエアの勢いが
強過ぎる場合にも、回転霧化頭１の塗料噴出孔１５から
エアが多量に吹き出てしまうが、噴出エアの圧力を１０
０ＫＰａ以下とすることにより、塗料噴出孔１５を通し
てのエアの過大な吹きだしを抑制できる。However, since the air that has entered the hollow portion 16 in the rotary shaft escapes from the air vent passage 17, the hollow portion 1 in the rotary shaft 1
The pressure increase in the hollow portion 16 in the rotary shaft due to the air entering 6 is suppressed as compared with the conventional case. Therefore, the amount of air passing through the paint ejection hole 15 of the rotary atomizing head 1 and the self-cleaning path 14 to the atmosphere is small, and the momentum is also small.
As a result, at the time of painting, the air is not blown forward without being transmitted to the inner surface of the atomizing head, and the amount of air caught in the paint is negligibly small. Therefore, the atomization of the paint in the rotary atomizing head 1 and the occurrence of coating defects are suppressed. The effect of preventing the paint and the cleaning agent from entering the hollow portion 16 is that the jet of compressed air is in the vicinity of the paint outlet of the paint feed tube 11 and the discharged paint is forcibly pushed forward by the air.
Secured enough. Even when the force of the air blown from the paint outlet is too strong, a large amount of air is blown out from the paint jet hole 15 of the rotary atomizing head 1, but the pressure of the jet air is set to 10
By setting the pressure to 0 KPa or less, it is possible to suppress excessive ejection of air through the paint ejection holes 15.
【００１５】本発明の各実施例に特有な作用について説
明する。本発明の第１実施例では、エア抜き経路１７を
エアモーター２のすぐ後方に設けたので、エア抜き経路
１７とエアモータ２との干渉がなく、配設が容易にあ
る。本発明の第２実施例では、エア抜き経路１８を回転
霧化頭１のすぐ後方に設けたので、エア抜き経路１８と
エアモータ２との干渉がなく、配設が容易にある。The operation unique to each embodiment of the present invention will be described. In the first embodiment of the present invention, since the air bleeding path 17 is provided immediately behind the air motor 2, there is no interference between the air bleeding path 17 and the air motor 2, and the arrangement is easy. In the second embodiment of the present invention, since the air bleeding path 18 is provided immediately behind the rotary atomizing head 1, there is no interference between the air bleeding path 18 and the air motor 2, and the arrangement is easy.
【００１６】[0016]
【発明の効果】本発明によれば、回転軸中空部に連通
し、該中空部に入っている塗料・洗浄剤侵入防止用エア
の一部を前記中空部から抜くための、回転霧化頭に形成
された塗料噴出孔およびセルフクリーニング経路以外
の、エア抜き経路を設けたので、回転軸中空部の圧力上
昇が抑えられ、塗料噴出孔やセルフクリーニング経路か
らエアが勢いよく噴出されることがなくなり、塗料は殆
どすべて回転霧化頭内面を伝ってエッジ部に至りそこか
ら飛散、微粒化され、微粒化不良が生じなくなる。ま
た、塗料噴出孔やセルフクリーニング経路からエアが勢
いよく噴出されることがなくなることによって、塗料の
エア巻き込みも無視できる程度になり、エア巻き込みに
よる塗装不良も生じなくなる。According to the present invention, a rotary atomizing head which communicates with a hollow portion of a rotary shaft and removes a part of the paint / cleaning agent intrusion prevention air contained in the hollow portion from the hollow portion. Since the air vent path other than the paint ejection hole and the self-cleaning path formed in the above is provided, the pressure rise in the hollow part of the rotating shaft is suppressed, and air may be ejected vigorously from the paint ejection hole or the self-cleaning path. Almost all of the coating material passes along the inner surface of the rotary atomizing head, reaches the edge portion, and is scattered and atomized from there, so that the atomization failure does not occur. Further, since the air is not vigorously ejected from the paint ejection hole or the self-cleaning path, the air entrainment of the paint becomes negligible, and the coating failure due to the air entrainment does not occur.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の第１実施例の回転霧化静電塗装装置の
断面図である。FIG. 1 is a sectional view of a rotary atomizing electrostatic coating apparatus according to a first embodiment of the present invention.
【図２】本発明の第２実施例の回転霧化静電塗装装置の
部分断面図である。FIG. 2 is a partial sectional view of a rotary atomizing electrostatic coating device according to a second embodiment of the present invention.
【図３】従来の回転霧化静電塗装装置の部分断面図であ
る。FIG. 3 is a partial sectional view of a conventional rotary atomizing electrostatic coating device.
１ 回転霧化静電塗装装置 ２ エアモーター ３ 回転軸 ４ エアキャップ ５ エアノズル ６ 外部電極 ７ 高電圧発生器 ８ 塗料タンク ９ ポンプ １０ バルブ １１ 塗料フィードチューブ １２ エアバルブ １３ 洗浄剤およびエア供給管 １４ セルフクリーニング経路 １５ 塗料噴出孔 １６ 中空部 １７、１８ エア抜き経路 １９ 洗浄剤経路 ２０ 切替バルブ ２１ 洗浄剤タンク ２２ 洗浄剤経路 ２３ 圧縮エア供給経路 ２４ 圧縮エア源 ２５ レギュレータ 1 rotary atomizing electrostatic coating device 2 air motor 3 rotating shaft 4 air cap 5 air nozzle 6 external electrode 7 high voltage generator 8 paint tank 9 pump 10 valve 11 paint feed tube 12 air valve 13 cleaning agent and air supply pipe 14 self-cleaning Route 15 Paint ejection hole 16 Hollow part 17, 18 Air bleeding route 19 Detergent route 20 Switching valve 21 Detergent tank 22 Detergent route 23 Compressed air supply route 24 Compressed air source 25 Regulator
Claims (1)
・洗浄剤侵入防止用エアの一部を前記中空部から抜くた
めの、回転霧化頭に形成された塗料噴出孔およびセルフ
クリーニング経路以外の、エア抜き経路と、を有する回
転霧化静電塗装装置。1. A rotary shaft having a hollow portion, and a rotary shaft communicating with the hollow portion of the rotary shaft for removing a part of paint / cleaning agent intrusion prevention air contained in the hollow portion from the hollow portion. A rotary atomizing electrostatic coating device having an air bleeding path other than a paint ejection hole formed in an atomizing head and a self-cleaning path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8026547A JPH09220498A (en) | 1996-02-14 | 1996-02-14 | Rotary atomizing electrostatic coating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8026547A JPH09220498A (en) | 1996-02-14 | 1996-02-14 | Rotary atomizing electrostatic coating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09220498A true JPH09220498A (en) | 1997-08-26 |
Family
ID=12196546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8026547A Pending JPH09220498A (en) | 1996-02-14 | 1996-02-14 | Rotary atomizing electrostatic coating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09220498A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7726586B2 (en) | 2004-11-08 | 2010-06-01 | Toyota Jidosha Kabushiki Kaisha | Rotary atomizing head and rotary atomizing coating machine |
| WO2015004966A1 (en) * | 2013-07-12 | 2015-01-15 | Abb株式会社 | Rotating atomizer head coater |
| JP2017035658A (en) * | 2015-08-10 | 2017-02-16 | トリニティ工業株式会社 | Coating machine and rotary atomization head used in the same |
| CN110624740A (en) * | 2019-09-02 | 2019-12-31 | 苏州市创诚金属制品有限公司 | Make things convenient for spray gun for spraying of angle modulation |
-
1996
- 1996-02-14 JP JP8026547A patent/JPH09220498A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7726586B2 (en) | 2004-11-08 | 2010-06-01 | Toyota Jidosha Kabushiki Kaisha | Rotary atomizing head and rotary atomizing coating machine |
| WO2015004966A1 (en) * | 2013-07-12 | 2015-01-15 | Abb株式会社 | Rotating atomizer head coater |
| JP6023331B2 (en) * | 2013-07-12 | 2016-11-09 | Abb株式会社 | Rotary atomizing head type coating machine |
| US9687863B2 (en) | 2013-07-12 | 2017-06-27 | Abb K.K. | Rotary atomizing head type coating machine |
| JP2017035658A (en) * | 2015-08-10 | 2017-02-16 | トリニティ工業株式会社 | Coating machine and rotary atomization head used in the same |
| WO2017026395A1 (en) * | 2015-08-10 | 2017-02-16 | トリニティ工業株式会社 | Painting machine and rotary atomizing head used for same |
| CN110624740A (en) * | 2019-09-02 | 2019-12-31 | 苏州市创诚金属制品有限公司 | Make things convenient for spray gun for spraying of angle modulation |
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