JP4189106B2 - Rotary atomizing coating equipment - Google Patents

Rotary atomizing coating equipment Download PDF

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Publication number
JP4189106B2
JP4189106B2 JP32443999A JP32443999A JP4189106B2 JP 4189106 B2 JP4189106 B2 JP 4189106B2 JP 32443999 A JP32443999 A JP 32443999A JP 32443999 A JP32443999 A JP 32443999A JP 4189106 B2 JP4189106 B2 JP 4189106B2
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Prior art keywords
paint
air
path
rotary atomizing
air chamber
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JP32443999A
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JP2001137746A (en
Inventor
正明 庄司
大輔 中囿
修 景山
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1064—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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas

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

Description

【０００１】
【発明の属する技術分野】
本発明は、回転霧化頭からワークに対して塗料を吐出して塗装を行う回転霧化式塗装装置に関する。
【０００２】
【従来の技術】
一般的に、塗料（液体塗料）に高電圧を印加して自動車車体等の被塗装物に静電塗装を施す塗装装置が採用されている。例えば、回転霧化頭の回転作用下に、前記回転霧化頭の先端縁から遠心力の作用により塗料を放出する回転霧化式塗装装置が知られている。
【０００３】
この種の回転霧化式塗装装置では、回転霧化頭に塗料を供給するための塗料経路が装置本体内に設けられるとともに、この塗料経路が塗料弁を介して開閉されることにより、前記塗料の供給および停止が行われている。この塗料弁は、通常、ケーシング部と、このケーシング部内に軸方向に摺動自在に嵌合されるピストンとを備えており、前記ピストンには、塗料経路側に突出して前記塗料経路を開閉する弁棒部が設けられている。
【０００４】
ケーシング部内には、パイロットエアが流入される第１エア室と、呼吸孔（孔部）を介して外部に開放される第２エア室（ばね室）とが、ピストンの両側に対応して設けられている。そして、塗装を行う際には、第１エア室にパイロットエアが流入されることにより、ピストンが第２エア室側に移動されて塗料経路が開放され、これによって回転霧化頭に塗料が供給されるように構成されている。
【０００５】
ところで、この種の塗料弁では、第１エア室内にパイロットエアを給排することにより、ピストンを軸方向に摺動させて塗料経路の開閉を行っている。このため、第１および第２エア室内で昇圧と降圧が繰り返し行われ、断熱膨張によって結露が発生するという問題が指摘されている。
【０００６】
そこで、例えば、特開平７−２５１１０３号公報に開示されているように、塗料弁のエア室等に水滴が滞留蓄積されることを防止しようとする提案がなされている。具体的には、図３に示すように、静電塗装機１内には、エアモータ２を介して中空状回転軸３が回転自在に配置されるとともに、この回転軸３には、図示しない回転霧化頭が接続されている。回転軸３内に塗料吐出管４が配置されており、前記塗料吐出管４が塗料弁５を介して開閉される。
【０００７】
塗料弁５を構成するケーシング６内には、エア室７とばね室８とがピストン９を介して形成されており、このピストン９には、塗料吐出管４を開閉自在な弁体９ａが設けられている。エア室７には、エア孔７ａが連通する一方、ばね室８には、外部に開放される呼吸孔８ａが連通し、前記エア室７と前記ばね室８とは、ピストン９に形成された小径な連通路９ｂを介して連通している。
【０００８】
このような構成において、塗装を行う際には、エア孔７ａからエア室７にパイロットエアが供給される。このため、ピストン９がエア圧を介してばね室８側に移動し、弁体９ａが塗料吐出管４から離脱して図示しない回転霧化頭に塗料が供給されることになる。その際、エア孔７ａからエア室７に供給されるパイロットエアは、連通路９ｂを介してばね室８側に僅かに流出し、さらにこのばね室８から呼吸孔８ａを介して外部に放出される。これにより、塗料弁５に水滴が滞留蓄積することを防止し、塗料を帯電するための高電圧のリークを阻止するようにしている。
【０００９】
【発明が解決しようとする課題】
しかしながら、上記の従来技術では、エア室７に供給されたエアがピストン９に設けられた小径な連通路９ｂを通ってばね室８に移動するため、この小径な連通路９ｂを通過した前記エアに断熱膨張が惹起され易い。これにより、ばね室８に導入されるエアの温度が低下し、このばね室８内で結露が発生してしまうという問題が指摘されている。そこで、連通路９ｂを大径に設定しようとすると、ピストン９を駆動させることが困難なものとなってしまう。仮に、ピストン９の駆動が可能であったとしても、相当に多量のエアが必要となるとともに、塗料弁５の開放動作が不安定なものになるという問題がある。
【００１０】
本発明はこの種の問題を解決するものであり、構成を簡素化かつ小型化するとともに、結露の発生を確実に阻止することが可能な回転霧化式塗装装置を提供することを目的とする。
【００１１】
【課題を解決するための手段】
本発明に係る回転霧化式塗装装置では、回転霧化頭に塗料を供給する塗料経路を開閉可能な塗料弁を備えるとともに、この塗料弁が、パイロットエアが流入される第１エア室と、孔部を介して外部に開放される第２エア室とを有し、かつ前記第２エア室が、回転霧化頭を回転させるエアタービンの排気エア用排出経路に排気エア連通路を介して連通している。
【００１２】
このため、パイロットエアが供給されない第２エア室には、排気エア用排出経路を流れる排気エアの一部が導入され、この排気エアが前記第２エア室に連通する孔部から外部に排出される。従って、第２エア室に水分が滞留することがなく、結露の発生を確実に阻止することが可能になる。しかも、第２エア室に連通するエア供給経路を新たに設ける必要がなく、構成が簡素化するとともに、塗料弁全体の小型化が容易に遂行される。
【００１３】
【発明の実施の形態】
図１は、本発明の実施形態に係る回転霧化式塗装装置１０の概略内部構成説明図である。
【００１４】
塗装装置１０は装置本体１２を備えており、この装置本体１２内にエアモータ１４が配設されるとともに、このエアモータ１４を構成するエアタービン１６には、円筒状回転軸１８が一体的に設けられ、前記回転軸１８の先端に回転霧化頭２０が固着される。
【００１５】
装置本体１２には、エアタービン１６を駆動するためのタービンエアを供給するタービンエア供給経路２２と、回転軸１８を支持するためのベアリングエア（タービンエアに含まれるため、以下、タービンエアともいう）を供給するベアリングエア供給経路２４と、エアモータ１４からの排気エアを外部に排出するための排気エア用排出経路２６とが形成されている。装置本体１２の中央には、管部材２８が回転軸１８内に配置されており、この管部材２８内に塗料経路３０および洗浄液経路３２が形成される。塗料経路３０および洗浄液経路３２の先端は、回転霧化頭２０の中央側から外部に開放されている。
【００１６】
塗料経路３０は、塗料弁３４の作用下に開放されることにより、図示しないワークに対して所定の塗料を吐出可能に構成される。塗料経路３０は、塗料を吐出する吐出口３０ａと、この吐出口３０ａの内方に設けられる弁座部３６と、一端側が前記弁座部３６に連通し、かつ他端側が塗料弁３４を構成する後述するケーシング部４０に連通する収容部３８と、前記収容部３８の他端側に対し、該収容部３８と角度を有して連通する塗料導入部３９とを備える。
【００１７】
塗料弁３４は、装置本体１２内に固着されるケーシング部４０を備え、このケーシング部４０内には、流体圧、例えば、空気圧によって軸方向（矢印Ａ方向）に進退自在なピストン４２が配設される。ピストン４２の端部から軸方向にロッド部４４が延在するとともに、このロッド部４４の先端部に弁棒部４６が設けられる。
【００１８】
弁棒部４６は、塗料経路３０の弁座部３６に着座することにより、この塗料経路３０を閉塞自在である。収容部３８には、弁座部３６とは反対側の端部に塗料導入室４８が拡径して設けられており、弁棒部４６には、前記塗料導入室４８に対応する位置で、前記弁座部３６側に向かって縮径するテーパ部５０が形成される。
【００１９】
図２に示すように、塗料弁３４を構成するケーシング部４０内には、ピストン４２の一端４２ａ側に設けられてパイロットエアが流入される第１エア室５２と、前記ピストン４２の他端４２ｂ側に設けられ、孔部（呼吸孔）５４を介して外部に開放される第２エア室（ばね室）５６とが設けられ、この第２エア室５６には、スプリング５８が配置されている。第１エア室５２には、パイロットエア経路６０が連通し、このパイロットエア経路６０が図示しないパイロットエア供給源に連通している。第２エア室５６には、エアモータ１４から排出経路２６を流れる排気エアの一部を、前記第２エア室５６を経由して孔部５４から外部に排出するための排気エア連通路６２が連通している。
【００２０】
装置本体１２内には、回転霧化頭２０から放出される塗料に静電気を帯電させるために図示しない高電圧印加手段が収容されている。
【００２１】
このように構成される塗装装置１０の動作について、以下に説明する。
【００２２】
図示しない塗料供給源から塗料経路３０に塗料が供給されており、塗料弁３４を構成する弁棒部４６が弁座部３６に着座することによって前記塗料の吐出が停止される。そこで、タービンエア供給経路２２にタービンエアが供給されてエアモータ１４を構成するエアタービン１６が回転霧化頭２０と一体的に高速回転されるとともに、ベアリングエア供給経路２４にタービンエアが供給されて回転軸１８が支持される。
【００２３】
一方、塗料弁３４では、パイロットエア経路６０を介して第１エア室５２にパイロットエアが供給され、ピストン４２がスプリング５８の弾性力に抗して矢印Ａ１方向に移動する。このため、ピストン４２に連結されている弁棒部４６が弁座部３６から離間し、塗料経路３０に供給されている塗料は、吐出口３０ａから回転霧化頭２０に放出されるとともに、図示しない高電圧印加手段を介してこの塗料に高電圧が印加される。従って、静電気を帯電した塗料は、霧化状態で放出されて図示しないワークに対し所望の静電塗装作業が遂行される。
【００２４】
この場合、本実施形態では、エアモータ１４から排出されるタービンエアが排出経路２６を介して排気されるとともに、この排気されるタービンエアの一部が排気エア連通路６２を通って第２エア室５６に導入され、さらに孔部５４から外部に排出されている。
【００２５】
これにより、タービンエアの一部が第２エア室５６を経由して孔部５４から外部に排出されるため、この第２エア室５６内に常に空気の流れが発生している。このため、塗料弁３４が開閉動作を繰り返し行っても、第２エア室５６内に結露が生ずることを確実に阻止することができるという効果が得られる。
【００２６】
しかも、排気されるタービンエアの排出経路２６と第２エア室５６とを、排気エア連通路６２を介して連通するだけでよく、この第２エア室５６に新規のエア供給経路を設ける必要がなく、構成が有効に簡素化する。さらに、排気エア連通路６２の開口径を比較的大径に、例えば、φ３ｍｍ程度に形成しても装置本体１２全体が大型化することがない。従って、排気エア連通路６２の開口径を大きく設定することができ、第２エア室５６内に導入される排気エアが断熱膨張を惹起することがなく、構成の簡素化および小型化を図るとともに、結露の発生を可及的に阻止することが可能になるという利点が得られる。
【００２７】
【発明の効果】
本発明に係る回転霧化式塗装装置では、塗料経路を開閉させる塗料弁が、パイロットエアを流入する第１エア室と、孔部を介して外部に開放される第２エア室とを有するとともに、前記第２エア室が回転霧化頭を回転させるエアタービンの排気エア用排出経路に排気エア連通路を介して連通している。このため、排気エア用排出経路を流れる排気エアの一部が、第２エア室を経由して孔部から外部に排出され、前記第２エア室内で結露が発生することを確実に阻止することができる。しかも、新規のエア供給経路を第２エア室に連通して設ける必要がなく、構成が簡素化し、装置本体全体の小型化が容易に遂行可能になる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る塗装装置の概略内部構成説明図である。
【図２】前記塗装装置を構成する塗料弁の動作説明図である。
【図３】従来技術に係る塗装装置の一部断面説明図である。
【符号の説明】
１０…塗装装置 １２…装置本体
１４…エアモータ １６…エアタービン
１８…回転軸 ２０…回転霧化頭
２２…タービンエア供給経路 ２４…ベアリングエア供給経路
２６…排出経路 ３０…塗料経路
３２…洗浄液経路 ３６…弁座部
３８…収容部 ３９…塗料導入部
４０…ケーシング部 ４２…ピストン
４６…弁棒部 ５０…テーパ部
５２、５６…エア室 ５４…孔部
５８…スプリング ６０…パイロットエア経路
６２…排気エア連通路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary atomizing coating apparatus that performs coating by discharging paint from a rotary atomizing head to a workpiece.
[0002]
[Prior art]
Generally, a coating apparatus that applies a high voltage to a paint (liquid paint) to apply electrostatic coating to an object to be coated such as an automobile body is employed. For example, there is known a rotary atomizing coating apparatus that discharges paint from the tip edge of the rotary atomizing head by the action of centrifugal force under the rotary action of the rotary atomizing head.
[0003]
In this type of rotary atomizing coating apparatus, a paint path for supplying paint to the rotary atomizing head is provided in the apparatus main body, and the paint path is opened and closed via a paint valve so that the paint Is being supplied and stopped. This paint valve usually includes a casing portion and a piston that is slidably fitted in the casing portion in the axial direction. The piston projects toward the paint path to open and close the paint path. A valve stem portion is provided.
[0004]
A first air chamber into which pilot air flows and a second air chamber (spring chamber) opened to the outside through a breathing hole (hole) are provided in the casing portion corresponding to both sides of the piston. It has been. When painting, pilot air flows into the first air chamber, the piston is moved to the second air chamber side, and the paint path is opened, thereby supplying paint to the rotary atomizing head. It is configured to be.
[0005]
By the way, in this type of paint valve, the paint air is opened and closed by sliding the piston in the axial direction by supplying and discharging pilot air to and from the first air chamber. For this reason, a problem has been pointed out that depressurization and depressurization are repeatedly performed in the first and second air chambers, and condensation occurs due to adiabatic expansion.
[0006]
Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. 7-251103, a proposal has been made to prevent water droplets from staying and accumulating in an air chamber or the like of a paint valve. Specifically, as shown in FIG. 3, a hollow rotary shaft 3 is rotatably disposed in the electrostatic coating machine 1 via an air motor 2. Atomizing head is connected. A paint discharge pipe 4 is disposed in the rotary shaft 3, and the paint discharge pipe 4 is opened and closed via a paint valve 5.
[0007]
An air chamber 7 and a spring chamber 8 are formed in a casing 6 constituting the paint valve 5 via a piston 9, and a valve body 9a capable of opening and closing the paint discharge pipe 4 is provided in the piston 9. It has been. An air hole 7 a communicates with the air chamber 7, while a breathing hole 8 a opened to the outside communicates with the spring chamber 8, and the air chamber 7 and the spring chamber 8 are formed in the piston 9. It communicates via a small-diameter communication path 9b.
[0008]
In such a configuration, when painting is performed, pilot air is supplied to the air chamber 7 from the air hole 7a. For this reason, the piston 9 moves to the spring chamber 8 side via the air pressure, the valve body 9a is detached from the paint discharge pipe 4, and the paint is supplied to the rotary atomizing head (not shown). At that time, the pilot air supplied to the air chamber 7 from the air hole 7a slightly flows out to the spring chamber 8 side through the communication passage 9b, and is further released to the outside from the spring chamber 8 through the breathing hole 8a. The As a result, water droplets are prevented from staying and accumulating in the paint valve 5, and high voltage leakage for charging the paint is prevented.
[0009]
[Problems to be solved by the invention]
However, in the above prior art, the air supplied to the air chamber 7 moves to the spring chamber 8 through the small-diameter communication passage 9b provided in the piston 9, so that the air that has passed through the small-diameter communication passage 9b. Adiabatic expansion is likely to occur. Thereby, the temperature of the air introduce | transduced into the spring chamber 8 falls, and the problem that dew condensation will generate | occur | produce in this spring chamber 8 is pointed out. Therefore, if the communication path 9b is set to have a large diameter, it is difficult to drive the piston 9. Even if the piston 9 can be driven, there is a problem that a considerable amount of air is required and the opening operation of the paint valve 5 becomes unstable.
[0010]
The present invention solves this type of problem, and aims to provide a rotary atomizing coating apparatus capable of simplifying and downsizing the configuration and reliably preventing the occurrence of condensation. .
[0011]
[Means for Solving the Problems]
The rotary atomizing coating apparatus according to the present invention includes a paint valve capable of opening and closing a paint path for supplying paint to the rotary atomizing head, and the paint valve includes a first air chamber into which pilot air flows, A second air chamber that is opened to the outside through a hole, and the second air chamber passes through an exhaust air communication path to an exhaust air discharge path of an air turbine that rotates the rotary atomizing head. Communicate.
[0012]
For this reason, a part of the exhaust air flowing through the exhaust air discharge path is introduced into the second air chamber to which pilot air is not supplied, and this exhaust air is discharged to the outside through the hole communicating with the second air chamber. The Therefore, moisture does not stay in the second air chamber, and it is possible to reliably prevent the occurrence of condensation. In addition, it is not necessary to newly provide an air supply path communicating with the second air chamber, the configuration is simplified, and the entire paint valve can be easily reduced in size.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an explanatory diagram of the schematic internal configuration of a rotary atomizing coating apparatus 10 according to an embodiment of the present invention.
[0014]
The coating apparatus 10 includes an apparatus main body 12. An air motor 14 is disposed in the apparatus main body 12, and a cylindrical rotating shaft 18 is integrally provided in an air turbine 16 constituting the air motor 14. The rotary atomizing head 20 is fixed to the tip of the rotary shaft 18.
[0015]
The apparatus main body 12 includes a turbine air supply path 22 for supplying turbine air for driving the air turbine 16 and a bearing air for supporting the rotary shaft 18 (below, it is also referred to as turbine air because it is included in the turbine air). ) And an exhaust air discharge path 26 for discharging exhaust air from the air motor 14 to the outside. In the center of the apparatus main body 12, a pipe member 28 is disposed in the rotary shaft 18, and a paint path 30 and a cleaning liquid path 32 are formed in the pipe member 28. The tips of the paint path 30 and the cleaning liquid path 32 are open to the outside from the center side of the rotary atomizing head 20.
[0016]
The paint path 30 is configured to be able to discharge a predetermined paint to a workpiece (not shown) by being opened under the action of the paint valve 34. The paint path 30 includes a discharge port 30a for discharging paint, a valve seat portion 36 provided inside the discharge port 30a, one end side communicating with the valve seat portion 36, and the other end side forming a paint valve 34. The housing part 38 communicated with the casing part 40 to be described later, and the paint introduction part 39 that communicates with the housing part 38 at an angle to the other end side of the housing part 38.
[0017]
The paint valve 34 includes a casing portion 40 that is fixed in the apparatus main body 12, and a piston 42 that is movable back and forth in the axial direction (arrow A direction) by fluid pressure, for example, air pressure, is disposed in the casing portion 40. Is done. A rod portion 44 extends in the axial direction from the end portion of the piston 42, and a valve rod portion 46 is provided at the distal end portion of the rod portion 44.
[0018]
The valve stem portion 46 can freely close the paint passage 30 by being seated on the valve seat portion 36 of the paint passage 30. The accommodating portion 38 is provided with a paint introduction chamber 48 having an enlarged diameter at the end opposite to the valve seat portion 36, and the valve stem portion 46 is located at a position corresponding to the paint introduction chamber 48. A tapered portion 50 that is reduced in diameter toward the valve seat portion 36 is formed.
[0019]
As shown in FIG. 2, a first air chamber 52 that is provided on one end 42 a side of the piston 42 and into which pilot air flows and a second end 42 b of the piston 42 are disposed in the casing portion 40 that constitutes the paint valve 34. A second air chamber (spring chamber) 56 provided on the side and opened to the outside through a hole (breathing hole) 54 is provided, and a spring 58 is disposed in the second air chamber 56. . A pilot air path 60 communicates with the first air chamber 52, and the pilot air path 60 communicates with a pilot air supply source (not shown). The second air chamber 56 communicates with an exhaust air communication passage 62 for discharging a part of the exhaust air flowing from the air motor 14 through the discharge path 26 to the outside through the hole portion 54 via the second air chamber 56. is doing.
[0020]
A high voltage applying means (not shown) is accommodated in the apparatus main body 12 in order to charge the paint discharged from the rotary atomizing head 20 with static electricity.
[0021]
The operation of the coating apparatus 10 configured as described above will be described below.
[0022]
Paint is supplied to the paint path 30 from a paint supply source (not shown), and the discharge of the paint is stopped when the valve rod portion 46 constituting the paint valve 34 is seated on the valve seat portion 36. Therefore, the turbine air is supplied to the turbine air supply path 22 and the air turbine 16 constituting the air motor 14 is rotated at a high speed integrally with the rotary atomizing head 20, and the turbine air is supplied to the bearing air supply path 24. The rotating shaft 18 is supported.
[0023]
On the other hand, in the paint valve 34, pilot air is supplied to the first air chamber 52 via the pilot air path 60, and the piston 42 moves in the direction of arrow A 1 against the elastic force of the spring 58. For this reason, the valve stem portion 46 connected to the piston 42 is separated from the valve seat portion 36, and the paint supplied to the paint passage 30 is discharged from the discharge port 30a to the rotary atomizing head 20 and is shown in the figure. A high voltage is applied to the paint through a high voltage applying means that does not. Accordingly, the electrostatically charged paint is discharged in an atomized state, and a desired electrostatic coating operation is performed on a workpiece (not shown).
[0024]
In this case, in the present embodiment, the turbine air discharged from the air motor 14 is exhausted through the discharge path 26, and a part of the exhausted turbine air passes through the exhaust air communication passage 62 to the second air chamber. 56 and further discharged from the hole 54 to the outside.
[0025]
Thereby, a part of the turbine air is discharged to the outside from the hole portion 54 via the second air chamber 56, so that an air flow is always generated in the second air chamber 56. For this reason, even if the paint valve 34 repeatedly performs the opening and closing operation, it is possible to reliably prevent the dew condensation from occurring in the second air chamber 56.
[0026]
Moreover, it is only necessary to connect the exhaust passage 26 of the turbine air to be exhausted and the second air chamber 56 via the exhaust air communication passage 62, and it is necessary to provide a new air supply path in the second air chamber 56. And the configuration is effectively simplified. Further, even if the opening diameter of the exhaust air communication passage 62 is formed to be relatively large, for example, about φ3 mm, the entire apparatus main body 12 does not increase in size. Accordingly, the opening diameter of the exhaust air communication passage 62 can be set large, the exhaust air introduced into the second air chamber 56 does not cause adiabatic expansion, and the configuration is simplified and miniaturized. The advantage that it becomes possible to prevent the occurrence of condensation as much as possible is obtained.
[0027]
【The invention's effect】
In the rotary atomizing coating apparatus according to the present invention, the paint valve that opens and closes the paint path has a first air chamber into which pilot air flows and a second air chamber that is opened to the outside through a hole. The second air chamber communicates with an exhaust air discharge path of an air turbine for rotating the rotary atomizing head via an exhaust air communication path. For this reason, a part of the exhaust air flowing through the exhaust air discharge path is discharged from the hole portion to the outside via the second air chamber, and the dew condensation is surely prevented from occurring in the second air chamber. Can do. In addition, it is not necessary to provide a new air supply path in communication with the second air chamber, the configuration is simplified, and the entire apparatus body can be easily downsized.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a schematic internal configuration of a coating apparatus according to an embodiment of the present invention.
FIG. 2 is an operation explanatory view of a paint valve constituting the painting apparatus.
FIG. 3 is a partial cross-sectional explanatory view of a coating apparatus according to a conventional technique.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Coating apparatus 12 ... Apparatus main body 14 ... Air motor 16 ... Air turbine 18 ... Rotating shaft 20 ... Rotary atomization head 22 ... Turbine air supply path 24 ... Bearing air supply path 26 ... Discharge path 30 ... Paint path 32 ... Cleaning liquid path 36 ... Valve seat part 38 ... Storage part 39 ... Paint introduction part 40 ... Casing part 42 ... Piston 46 ... Valve rod part 50 ... Taper part 52, 56 ... Air chamber 54 ... Hole part 58 ... Spring 60 ... Pilot air path 62 ... Exhaust Air communication passage

Claims (1)

ワークに対して塗料を吐出可能な回転霧化頭と、
前記回転霧化頭を回転させるエアタービンを収容するとともに、前記エアタービンの排気エア用排出経路が設けられた装置本体と、
前記装置本体に設けられ、前記回転霧化頭に塗料を供給する塗料経路と、
前記装置本体に設けられ、前記塗料経路を開放させることによりワークに対して塗料を吐出可能な塗料弁と、
を備えた回転霧化式塗装装置であって、
前記塗料弁は、ケーシング部と、
前記ケーシング部内に軸方向に摺動自在に嵌合されるとともに、前記ケーシング部から前記塗料経路に突出して該塗料経路を開閉する弁棒部を有するピストンと、
前記ケーシング部内で前記ピストンの一端側に設けられ、パイロットエアが流入される第１エア室と、
前記ケーシング部内で前記ピストンの他端側に設けられ、孔部を介して外部に開放される第２エア室と、
前記第２エア室と前記排気エア用排出経路とを連通し、該排気エア用排出経路を流れる排気エアの一部を該第２エア室を経由して前記孔部から外部に排出するための排気エア連通路と、
を備えることを特徴とする回転霧化式塗装装置。A rotary atomizing head capable of discharging paint to the workpiece;
An apparatus main body that houses an air turbine that rotates the rotary atomizing head, and that is provided with a discharge path for exhaust air of the air turbine;
A paint path provided in the apparatus main body, for supplying paint to the rotary atomizing head;
A paint valve provided in the apparatus main body and capable of discharging paint to a workpiece by opening the paint path;
A rotary atomizing coating device comprising:
The paint valve includes a casing part,
A piston having a valve rod portion that is slidably fitted in the casing portion in the axial direction and projects from the casing portion to the paint path to open and close the paint path;
A first air chamber provided on one end side of the piston in the casing portion and into which pilot air flows;
A second air chamber provided on the other end side of the piston in the casing portion and opened to the outside through a hole;
The second air chamber communicates with the exhaust air discharge path, and a part of the exhaust air flowing through the exhaust air discharge path is discharged from the hole portion to the outside via the second air chamber. An exhaust air communication path;
A rotary atomizing coating apparatus characterized by comprising:
JP32443999A 1999-11-15 1999-11-15 Rotary atomizing coating equipment Expired - Lifetime JP4189106B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4108344A1 (en) * 2021-06-23 2022-12-28 Abb Schweiz Ag Electrostatic coating device

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
FR2860996B1 (en) * 2003-10-20 2005-12-16 Sames Technologies ROTATING PROJECTOR OF COATING PRODUCT AND COATING PROJECTION INSTALLATION COMPRISING SUCH A PROJECTOR
JP4726188B2 (en) * 2004-12-13 2011-07-20 本田技研工業株式会社 Electrostatic coating method and apparatus
CN108602077B (en) * 2016-02-12 2021-01-12 本田技研工业株式会社 Coating device
JP6754894B2 (en) * 2017-03-30 2020-09-16 本田技研工業株式会社 Electrostatic coating equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4108344A1 (en) * 2021-06-23 2022-12-28 Abb Schweiz Ag Electrostatic coating device

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