JP6044774B2 - Electrostatic coating machine - Google Patents

Electrostatic coating machine Download PDF

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JP6044774B2
JP6044774B2 JP2013022318A JP2013022318A JP6044774B2 JP 6044774 B2 JP6044774 B2 JP 6044774B2 JP 2013022318 A JP2013022318 A JP 2013022318A JP 2013022318 A JP2013022318 A JP 2013022318A JP 6044774 B2 JP6044774 B2 JP 6044774B2
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atomizing head
rotary atomizing
air motor
coating machine
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敬二 真鍋
敬二 真鍋
喜一 平本
喜一 平本
貴志 土屋
貴志 土屋
鈴木 浩之
浩之 鈴木
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Taikisha Ltd
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Description

本発明は静電塗装機に関し、詳しくは、外部塗料路を通じて機体に供給される塗料を機体先端の噴霧部に導く内部塗料路を機体の内部に設け、前記噴霧部から外部に噴霧する塗料を高電圧発生器による発生電圧により帯電状態にする帯電手段を設けた静電塗装機に関する。   The present invention relates to an electrostatic coating machine, and more specifically, an internal paint path that guides paint supplied to the machine body through an external paint path to a spray part at the tip of the machine body is provided inside the machine body, and paint that is sprayed from the spray part to the outside is provided. The present invention relates to an electrostatic coating machine provided with charging means for making a charged state by a voltage generated by a high voltage generator.

静電塗装機には以前より直接帯電方式と間接帯電方式とがあり、直接帯電方式では、帯電手段として導電電極を機体の内部に設け、この導電電極に高電圧発生器による発生高電圧を印加した状態で噴霧前の塗料を導電電極に対して直接に接触させることで噴霧前の塗料を帯電させ、この帯電塗料を噴霧部から噴霧する(特許文献1参照)。   Electrostatic coating machines have a direct charging method and an indirect charging method. In the direct charging method, a conductive electrode is provided inside the machine as a charging means, and a high voltage generated by a high voltage generator is applied to this conductive electrode. In this state, the paint before spraying is directly brought into contact with the conductive electrode to charge the paint before spraying, and the charged paint is sprayed from the spraying portion (see Patent Document 1).

一方、間接帯電方式では、帯電手段として塗装機本体の外部で噴霧部の近傍に外部電極を配置し、この外部電極に高電圧発生器による発生高電圧を印加して噴霧部近傍にコロナ放電領域を形成した状態で噴霧部から塗料を噴霧することで、噴霧直後の塗料をコロナ放電により外部電極とは非接触の状態で帯電させる(特許文献2参照)。   On the other hand, in the indirect charging method, an external electrode is arranged in the vicinity of the spraying part outside the coating machine main body as a charging means, and a high voltage generated by a high voltage generator is applied to the external electrode so that the corona discharge region is near the spraying part. By spraying the coating material from the spraying portion in a state where is formed, the coating material immediately after spraying is charged in a non-contact state with the external electrode by corona discharge (see Patent Document 2).

特開2006−346596号JP 2006-346596 A 特開平4−215864号JP-A-4-215864

しかし、使用する塗料が溶剤系塗料の場合、溶剤系塗料の電気抵抗値が高いことから特に問題がないものの、水性塗料やメタリック塗料などの電気抵抗値が低い塗料を用いる場合、直接帯電方式では高電圧印加状態の導電電極に対する接触により塗料に付与した電荷が内部塗料路及び外部塗料路における後続の塗料を通じてアース部にリークしてしまい、そのことで静電塗装が不能になる。   However, when the paint used is a solvent-based paint, there is no particular problem because the electrical resistance value of the solvent-based paint is high, but when using a paint with a low electrical resistance value such as a water-based paint or metallic paint, The electric charge applied to the paint due to contact with the conductive electrode in the high voltage application state leaks to the ground through the subsequent paint in the internal paint path and the external paint path, which makes electrostatic painting impossible.

このため、直接帯電方式で水性塗料やメタリック塗料などの電気抵抗値の低い塗料を用いる場合には、導電電極との接触により帯電させて噴霧部に送る塗料と後続の塗料とをそれらの連続性を断って電気的に絶縁する絶縁手段が必要になり、このため、塗装機や塗装機周りの構造が複雑になって装置コストが大きくなるとともに装置メンテナンスの負担が大きくなる問題があった。   For this reason, when using paints with low electrical resistance such as water-based paints and metallic paints by the direct charging method, the paint that is charged by contact with the conductive electrode and sent to the spray section and the subsequent paints are continuous. Therefore, there is a problem in that an insulating means for electrically insulating is required, and the structure of the coating machine and the surroundings of the coating machine becomes complicated, which increases the cost of the apparatus and increases the burden of apparatus maintenance.

また、塗料の連続性を断つため長時間にわたる連続塗装を行うことができず、そのことで塗装作業性が制約される問題もあった。   In addition, since the continuity of the paint is cut off, continuous coating over a long period of time cannot be performed, which causes a problem that the workability of the coating is restricted.

一方、間接帯電方式では噴霧後の塗料を帯電させることから、塗料に付与した電荷が後続塗料を通じてアース部にリークすることはないが、外部電極とは非接触の状態でコロナ放電により塗料を間接的に帯電させるため直接帯電方式に比べ塗料の帯電電圧が低くなり、このため、直接帯電方式に比べて被塗物に対する塗着効率が低く制限される問題があった。   On the other hand, in the indirect charging method, the paint after spraying is charged, so the charge applied to the paint does not leak to the ground through the subsequent paint, but the paint is indirectly in contact with the external electrode by corona discharge. Therefore, the charging voltage of the paint is lower than that of the direct charging method, and therefore, there is a problem that the coating efficiency with respect to the object to be coated is limited as compared with the direct charging method.

また、外部電極を機体の外部で噴霧部の近傍に配置するため、外部電極に対する噴霧塗料の付着が多く、このため、付着塗料を除去する清掃メンテナンスの負担が大きくなる問
題もあった。
In addition, since the external electrode is disposed in the vicinity of the spraying portion outside the machine body, the spray paint is often attached to the external electrode, which causes a problem of increasing the burden of cleaning maintenance for removing the attached paint.

この実情に鑑み、本発明の主たる課題は、合理的な帯電方式を採用することで上記の如き問題を効果的に解消する点にある。   In view of this situation, the main problem of the present invention is to effectively solve the above problems by adopting a rational charging method.

本発明の第1特徴構成は静電塗装機に係り、その特徴は、
外部塗料路を通じて機体に供給される塗料を機体先端の噴霧部に導く内部塗料路を機体の内部に設け、
前記噴霧部から外部に噴霧する塗料を高電圧発生器による発生電圧により帯電状態にする帯電手段を設けた静電塗装機であって、
前記帯電手段として、前記高電圧発生器による発生電圧を印加する誘導電極部を、前記内部塗料路の通過塗料とは電気的に非接触にした状態で機体の内部において前記内部塗料路の近傍に配置し、
前記高電圧発生器による電圧印加により前記誘導電極部を帯電状態にすることで静電誘導により前記内部塗料路の通過塗料を、前記誘導電極部に対する印加電圧の極性とは逆極性に帯電させて、この帯電塗料を前記噴霧部から噴霧する構成にし、
前記噴霧部として前記内部塗料路からの供給塗料を回転に伴う遠心力により外周縁部から飛散させる回転霧化ヘッドを設け、
前記機体の内部に設けたエアモータの回転出力軸を前記回転霧化ヘッドに連結して、このエアモータにより前記回転霧化ヘッドを回転させる構成にし、
前記内部塗料路を形成する塗料供給チューブを前記エアモータの回転出力軸における中央孔に挿通して前記回転霧化ヘッドに渡らせ、
この塗料供給チューブ及び前記エアモータの回転出力軸を電気絶縁材により形成し、
前記エアモータのタービン部は、前記機体の内部において前記内部塗料路の通過塗料とは電気的に非接触の状態で、前記回転出力軸及びその内部の前記塗料供給チューブを近接状態で全周にわたって囲む状態に配置し、
前記高電圧発生器の電圧出力端を前記タービン部に対して電気的に接続することで、前記タービン部を前記誘導電極部にしてある点にある。
The first characteristic configuration of the present invention relates to an electrostatic coating machine,
An internal paint path is installed inside the fuselage to guide the paint supplied to the fuselage through the external paint path to the spray section at the tip of the fuselage.
An electrostatic coating machine provided with charging means for charging the paint sprayed to the outside from the spraying portion with a voltage generated by a high voltage generator,
As the charging means, an induction electrode portion for applying a voltage generated by the high voltage generator is placed in the vicinity of the internal paint path inside the fuselage in a state where it is not in electrical contact with the paint passing through the internal paint path. Place and
By charging the induction electrode part with a voltage applied by the high voltage generator, the paint passing through the internal paint path is charged to a polarity opposite to the polarity of the applied voltage to the induction electrode part by electrostatic induction. , The charging paint is sprayed from the spraying part,
As the spraying section, a rotary atomizing head that disperses the paint supplied from the internal paint path from the outer peripheral edge by centrifugal force accompanying rotation,
A rotary output shaft of an air motor provided inside the machine body is connected to the rotary atomizing head, and the rotary atomizing head is rotated by the air motor,
A paint supply tube forming the internal paint path is inserted through a central hole in the rotation output shaft of the air motor and passed to the rotary atomizing head;
The paint supply tube and the rotation output shaft of the air motor are formed of an electrical insulating material,
The turbine section of the air motor surrounds the rotation output shaft and the paint supply tube inside the entire circumference of the rotary output shaft and the paint supply tube in a state of being in non-contact with the passing paint of the internal paint path inside the airframe. Placed in a state,
The voltage output terminal of the high voltage generator is electrically connected to the turbine unit, whereby the turbine unit is used as the induction electrode unit .

この構成の静電塗装機では、誘導電極部による静電誘導により内部塗料路の通過塗料に静電分極を生じさせて、誘導電極部に対する印加電圧の極性と同極性の分極電荷については後続塗料や接触導電部を通じてアース部にリークさせながら、誘導電極部に対する印加電圧の極性とは逆極性の分極電荷を通過塗料中に保持させる形態で通過塗料を帯電させるから、水性塗料やメタリック塗料などの電気抵抗値の低い塗料を使用する場合でも、塗料に付与した帯電電荷(上記逆極性の分極電荷)が後続塗料を通じてアース部にリークすることがない。   In the electrostatic coating machine having this configuration, electrostatic polarization is caused in the paint passing through the internal paint path by electrostatic induction by the induction electrode unit, and the subsequent charge is applied to the polarization charge having the same polarity as the voltage applied to the induction electrode unit. In addition, the passing paint is charged in such a manner that the polarization charge having the opposite polarity to the polarity of the voltage applied to the induction electrode part is retained in the passing paint while leaking to the ground part through the contact conductive part. Even when a paint having a low electric resistance value is used, the charged charge (polarized charge having the reverse polarity) applied to the paint does not leak to the ground portion through the subsequent paint.

従って、水性塗料やメタリック塗料などの電気抵抗値の低い塗料を使用する場合でも、従来の直接帯電方式の塗装機に付加されていた塗料の連続性を断つ絶縁手段を不要にしながら、帯電塗料を噴霧部から噴霧することができて被塗物に対する静電塗装を行うことができ、これにより、絶縁手段を備える直接帯電方式の塗装機に比べ、塗装機や塗装機周りの構造を簡素にして装置コストや装置メンテナンスの負担を効果的に低減することができる。   Therefore, even when using paints with low electrical resistance, such as water-based paints and metallic paints, charging paints can be used while eliminating the need for insulating means that break the continuity of paints that have been added to conventional direct-charging coating machines. It can be sprayed from the spraying part and electrostatic coating can be performed on the object to be coated, which makes the structure of the coating machine and the coating machine simpler than the direct charging type coating machine equipped with insulating means. Equipment costs and equipment maintenance burdens can be effectively reduced.

また、塗料の連続性を断つ必要がないことから、水性塗料やメタリック塗料などの電気抵抗値の低い塗料を用いる場合でも、長時間にわたる連続塗装が可能になり、これにより、塗装作業性も高めることができる。   In addition, since there is no need to break the continuity of the paint, even when using paints with low electrical resistance, such as water-based paints and metallic paints, continuous painting over a long period of time is possible, thereby improving the workability of painting. be able to.

そしてまた、誘電電極部とは電気的に非接触の状態で塗料を間接的に帯電させるものでありながら、その帯電が内部塗料路の近傍に配置した誘導電極部からの静電誘導による帯電であることで、塗料の帯電電圧を誘導電極部に対する印加電圧と同等程度にまで高くすることができ、これにより、外部電極を備える間接帯電方式の塗装機に比べ被塗物に対する塗着効率も効果的に高めることができる。   In addition, while the dielectric electrode part is for charging the paint indirectly in an electrically non-contact state, the charge is charged by electrostatic induction from the induction electrode part arranged in the vicinity of the internal paint path. As a result, the charging voltage of the paint can be increased to the same level as the voltage applied to the induction electrode, and this also improves the coating efficiency for the object to be coated compared to the indirect charging type coating machine with external electrodes. Can be enhanced.

しかも、誘導電極部は機体の内部に配置するから、誘導電極部に対する噴霧塗料の付着がなく、これにより、外部電極を備える間接帯電方式の塗装機に比べ付着塗料を除去する清掃メンテナンスの負担も効果的に軽減することができる。   In addition, since the induction electrode part is arranged inside the machine body, there is no adhesion of spray paint to the induction electrode part, and this also imposes a burden on cleaning maintenance that removes the adhesion paint compared to an indirect charging type coating machine equipped with external electrodes. It can be effectively reduced.

そしてまた、上記の第1特徴構成では、
前記噴霧部として前記内部塗料路からの供給塗料を回転に伴う遠心力により外周縁部か
ら飛散させる回転霧化ヘッドを設け、
機体の内部に設けたエアモータの回転出力軸を前記回転霧化ヘッドに連結して、このエアモータにより前記回転霧化ヘッドを回転させる構成にし、
前記内部塗料路を形成する塗料供給チューブを前記エアモータの回転出力軸における中央孔に挿通して前記回転霧化ヘッドに渡らせ、
この塗料供給チューブ及び前記エアモータの回転出力軸を電気絶縁材により形成し、
前記エアモータのタービン部は、前記機体の内部において前記内部塗料路の通過塗料とは電気的に非接触の状態で、前記回転出力軸及びその内部の前記塗料供給チューブを近接状態で全周にわたって囲む状態に配置し、
前記高電圧発生器の電圧出力端を前記タービン部に対して電気的に接続することで、前記タービン部を前記誘導電極部にするから、次の作用効果も奏する。
And, in the above first feature configuration,
As the spraying section, a rotary atomizing head that disperses the paint supplied from the internal paint path from the outer peripheral edge by centrifugal force accompanying rotation,
A rotary output shaft of an air motor provided inside the airframe is connected to the rotary atomizing head, and the rotary atomizing head is rotated by the air motor,
A paint supply tube forming the internal paint path is inserted through a central hole in the rotation output shaft of the air motor and passed to the rotary atomizing head;
The paint supply tube and the rotation output shaft of the air motor are formed of an electrical insulating material ,
The turbine section of the air motor surrounds the rotation output shaft and the paint supply tube inside the entire circumference of the rotary output shaft and the paint supply tube in a state of being in non-contact with the passing paint of the internal paint path inside the airframe. Placed in a state,
Since the turbine part is made the induction electrode part by electrically connecting the voltage output terminal of the high voltage generator to the turbine part, the following effects are also achieved.

つまり、この構成の静電塗装機であれば、回転霧化ヘッドを備える直接帯電方式の静電塗装機で使用されている金属製の塗料供給チューブ及び金属製のエアモータ回転出力軸を電気絶縁材からなるものに変更するごく簡単な仕様変更だけで、内部塗料路の通過塗料を静電誘導により帯電させる上述の静電塗装機を容易に製作することができる。 In other words, in the electrostatic coating machine having this configuration, the metal paint supply tube and the metal air motor rotation output shaft used in the direct charging type electrostatic coating machine having the rotary atomizing head are electrically insulated. The above-described electrostatic coating machine that charges the paint passing through the internal paint path by electrostatic induction can be easily manufactured with only a very simple specification change.

即ち、回転霧化ヘッドを備える直接帯電方式の静電塗装機では一般に、回転霧化ヘッド、その回転霧化ヘッドに接続するエアモータの回転出力軸並びに回転霧化ヘッドに渡らせる塗料供給チューブの夫々を金属材製にするとともに、高電圧発生器の電圧出力端を同じく金属製のエアモータにおけるタービン部に対して電気的に接続することで、金属製の回転霧化ヘッド及び塗料供給チューブを高電圧印加の導電電極として、それら回転霧化ヘッド及び塗料供給チューブに対する塗料の接触により噴霧前の塗料を帯電させる構成を採用している。 That is, in a direct charging type electrostatic coating machine having a rotary atomizing head, generally, the rotary atomizing head, the rotation output shaft of an air motor connected to the rotary atomizing head, and the paint supply tube to be passed to the rotary atomizing head, respectively. Is made of a metal material, and the voltage output terminal of the high voltage generator is electrically connected to the turbine section of the same metal air motor, so that the metal rotary atomizing head and the paint supply tube can be connected to a high voltage. As the applied conductive electrode, a configuration is adopted in which the paint before spraying is charged by contact of the paint with the rotary atomizing head and the paint supply tube.

従って、この直接帯電方式の静電塗装機に対する仕様変更として、少なくとも、エアモータと回転霧化ヘッドとを連結する金属材製のエアモータ回転出力軸、及び、そのエアモータ回転出力軸に挿通して回転霧化ヘッドに渡らせる金属材製の塗料供給チューブを電気絶縁材からなるものに変更することで、直接帯電方式における導電電極は無くして、その代わりに、高電圧発生器の電圧出力端が電気的に接続されているエアモータのタービン部を、機体の内部において内部塗料路の通過塗料とは電気的に非接触の状態で内部塗料路(塗料供給チューブ)の近傍に位置する誘電電極部とすることができ、これにより、高電圧印加状態のエアモータにおけるタービン部による静電誘導により通過塗料を帯電させることができて、水性塗料やメタリック塗料などの電気抵抗値が小さい塗料の使用にも適した上述の静電塗装機を容易に製作することができ、また、その製作コストを安価にすることができる。 Therefore, as a specification change for the electrostatic charging machine of the direct charging method, at least a metal-made air motor rotating output shaft that connects the air motor and the rotating atomizing head, and the rotating fog that is inserted through the air motor rotating output shaft. By changing the metal paint supply tube that is passed to the control head to one made of electrical insulating material, there is no conductive electrode in the direct charging method, and instead, the voltage output terminal of the high voltage generator is electrically The turbine part of the air motor connected to the inside shall be a dielectric electrode part located in the vicinity of the internal paint path (paint supply tube) in an electrically non-contact state with the paint passing through the internal paint path inside the fuselage It can be, thereby, be able to charge the passing paint by electrostatic induction by the turbine section of the air motor of the high-voltage applied state, water-based paint or methallyl Even electrostatic coating machine described above can be easily manufactured which are suitable for use electric resistance value smaller paint such as click paints also be inexpensive to its manufacturing cost.

本発明の第特徴構成は、第特徴構成の静電塗装機の実施に好適な実施形態を特定するものであり、その特徴は、
前記回転霧化ヘッドを前記塗料供給チューブから供給される帯電状態の塗料に対する電気絶縁性を備える構成にしてある点にある。
The second characteristic configuration of the present invention specifies an embodiment suitable for the implementation of the electrostatic coating machine of the first characteristic configuration,
The rotary atomizing head is configured to have an electrical insulation property against the charged paint supplied from the paint supply tube.

この構成の静電塗装機であれば、静電誘導により帯電した塗料が塗料供給チューブを通じ回転霧化ヘッドに供給されて回転霧化ヘッドに接触するにしても、帯電状態の塗料に対する回転霧化ヘッドの電気絶縁性により帯電塗料が持つ帯電電荷を確実に保持した状態で、その帯電塗料を回転霧化ヘッドの回転により霧化することができ、これにより、被塗物に対する塗着効率を一層効果的に高めることができる。   In the electrostatic coating machine having this configuration, even if the paint charged by electrostatic induction is supplied to the rotary atomizing head through the paint supply tube and comes into contact with the rotary atomizing head, the rotational atomization of the charged paint is performed. The charged paint can be atomized by the rotation of the rotary atomizing head while the charged charge of the charged paint is securely held by the electrical insulation of the head, thereby further increasing the coating efficiency on the object to be coated. Can be effectively increased.

また、回転霧化ヘッドに接触する帯電塗料からの導電により回転霧化ヘッドとアース状態にある他物や作業者との間でスパークが生じることを、帯電状態の塗料に対する回転霧化ヘッドの電気絶縁性により防止することもでき、これにより、直接帯電方式や間接帯電方式の塗装機に比べスパーク事故に対する安全性も高めることができる。   In addition, the electric conduction from the charged paint that contacts the rotary atomizing head may cause a spark between the rotary atomizing head and another object or worker in the ground state. It can also be prevented by insulation, which can improve the safety against a spark accident as compared with a direct charging type or indirect charging type coating machine.

なお、この構成の静電塗装機を実施において回転霧化ヘッドを帯電状態の塗料に対する電気絶縁性を備えるものにするには、回転霧化ヘッドの全体を電気絶縁材により形成したり、回転霧化ヘッドに電気絶縁性の被覆層を設けるなどしてもよい。   In order to make the rotary atomizing head electrically insulating with respect to the charged paint in the electrostatic coating machine of this configuration, the entire rotary atomizing head is made of an electrical insulating material, An electrical insulating coating layer may be provided on the conversion head.

本発明の第特徴構成は、第又は第特徴構成の静電塗装機の実施に好適な実施形態を特定するものであり、その特徴は、
前記エアモータの収容部である機体先端部の外郭を形成するとともに先端開口部を通じて外部に露出させた前記回転霧化ヘッドの外周部との間にシェービングエア噴出部を形成するエアノズル形成カバーを設け、
このエアノズル形成カバーを電気絶縁材で形成してある点にある。
The third characteristic configuration of the present invention specifies an embodiment suitable for the implementation of the electrostatic coating machine of the first or second characteristic configuration,
An air nozzle forming cover is provided that forms an outline of the front end of the airframe that is the housing portion of the air motor and forms a shaving air ejection portion between the outer periphery of the rotary atomizing head exposed to the outside through the front end opening,
This air nozzle forming cover is formed of an electrically insulating material.

この構成の静電塗装機によれば、誘導電極部として高電圧印加の帯電状態とするエアモータのタービン部による静電誘導でエアモータの収容部である機体先端部の外郭にも誘電分極が生じ、そのことで機体先端部の外郭とアース状態にある他物や作業者との間でスパークが生じることを、電気絶縁材からなる上記エアノズル形成カバーにより防止することができ、これにより、スパーク事故に対する安全性を一層高めることができる。 According to the electrostatic coating machine of this configuration, dielectric polarization occurs also in the outer periphery of the airframe tip portion that is the housing portion of the air motor due to electrostatic induction by the turbine portion of the air motor that is charged as a high voltage application as the induction electrode portion, As a result, it is possible to prevent the occurrence of a spark between the outer shell of the airframe tip and other objects or workers in the ground state by the air nozzle forming cover made of an electrical insulating material, thereby preventing a spark accident. Safety can be further enhanced.

本発明による誘導帯電方式の静電塗装機の縦断面図Longitudinal sectional view of the electrostatic charging machine of the induction charging system according to the present invention

図1は塗装ロボットのアームの先端部などに装備する誘導帯電方式の静電塗装機を示し、砲弾形状の機体1(塗装機本体)の先端には、噴霧部としてのベル型の回転霧化ヘッド2を装備してある。   Fig. 1 shows an electrostatic charging machine with an induction charging system installed at the tip of the arm of a painting robot. At the tip of a shell-shaped body 1 (the main body of the coating machine), a bell-shaped rotary atomizer as a spraying part is shown. Head 2 is equipped.

この回転霧化ヘッド2では、その中央部に形成した塗料供給孔2aから高電圧帯電状態の塗料T(本例では水性塗料やメタリック塗料などの電気抵抗値の小さな塗料)を回転霧化ヘッド2の内面側に吐出させることで、この吐出塗料Tを回転霧化ヘッド2の回転による遠心力により回転霧化ヘッド2の外周縁から微細化した状態で回転霧化ヘッド2の半径方向に飛散させて噴霧し、この噴霧塗料T(具体的には塗料粒子の分散群)を回転霧化ヘッド2の周縁部の後方から噴出するシェーピングエアAにより変向させることで、噴霧塗料Tの噴霧パターンPを機体1の前方に向く円筒状ないし逆円錐状にする。   In this rotary atomizing head 2, a high voltage charged paint T (in this example, a paint having a small electrical resistance value such as a water-based paint or a metallic paint) is applied from the paint supply hole 2 a formed at the center thereof. By discharging to the inner surface side of the rotary atomizing head 2, the discharged paint T is scattered in the radial direction of the rotary atomizing head 2 in a state where it is made finer from the outer peripheral edge of the rotary atomizing head 2 by the centrifugal force generated by the rotation of the rotary atomizing head 2. The spray paint T (specifically, a dispersion group of paint particles) is redirected by the shaping air A ejected from the rear of the peripheral edge of the rotary atomizing head 2, whereby the spray pattern P of the spray paint T is sprayed. Is formed into a cylindrical shape or an inverted conical shape facing the front of the body 1.

そして、この噴霧パターンPの状態で噴霧塗料Tを、その帯電極性とは逆極性の電圧を印加した自動車ボディなどの被塗物(図示せず)に対して電気的引力により塗着させることで、その被塗物をいわゆる静電塗装方式により塗装する。 Then, in the state of the spray pattern P, the spray paint T is applied by electrical attraction to an object (not shown) such as an automobile body to which a voltage having a polarity opposite to the charged polarity is applied. The object to be coated is applied by a so-called electrostatic coating method.

機体1の先端部には、その機体先端部の外郭を形成するとともに先端開口部3aを通じて回転霧化ヘッド2を機体1から前方に向けて露出させるエアノズル形成カバー3を装着してあり、このエアノズル形成カバー3の装着によりエアノズル形成カバー3における先端開口縁と回転霧化ヘッド2の背面との間の隙間部分に先端開口部3aの全周にわたるシェーピングエア噴出部4を形成し、このシェーピングエア噴出部4から機体1の前方に向けて上記シェーピングエアAを噴出させる。   An air nozzle forming cover 3 that forms an outline of the front end of the airframe and exposes the rotary atomizing head 2 forward from the airframe 1 through the front end opening 3a is attached to the front end of the airframe 1. By attaching the forming cover 3, a shaping air ejection part 4 is formed over the entire circumference of the front end opening 3 a in the gap between the front opening edge of the air nozzle forming cover 3 and the back surface of the rotary atomizing head 2. The shaping air A is ejected from the portion 4 toward the front of the body 1.

さらに具体的には、外周面に多数の凹溝を形成したノズル形成筒5をエアノズル形成カバー3に内嵌して、ノズル形成筒5の各凹溝をエアノズル形成カバー3により蓋する状態にすることで、それら凹溝の夫々をエア通路にして各凹溝の先端側の開口をエアノズル形成カバー3における先端開口部3aの全周にわたって並ぶエア噴出口にし、これらのエア噴出口の環状群により上記シェーピングエア噴出部4を形成してある。   More specifically, the nozzle forming cylinder 5 in which a large number of concave grooves are formed on the outer peripheral surface is fitted into the air nozzle forming cover 3 so that each concave groove of the nozzle forming cylinder 5 is covered with the air nozzle forming cover 3. Thus, each of the concave grooves is used as an air passage, and the opening on the leading end side of each concave groove is formed as an air outlet arranged along the entire circumference of the tip opening 3a in the air nozzle forming cover 3, and the annular group of these air outlets is used. The shaping air ejection part 4 is formed.

エアノズル形成カバー3を取り付けた機体1の先端部には、回転霧化ヘッド2を回転させるタービン型エアモータ6のタービン部6aを内蔵してあり、このタービン部6aを機
体1の外部からホースを通じて供給する圧縮空気により回転させることで、回転霧化ヘッド2に連結したエアモータ6の回転出力軸6bを駆動回転させて回転霧化ヘッド2を回転させる。
A turbine part 6a of a turbine type air motor 6 for rotating the rotary atomizing head 2 is built in the front end of the machine body 1 to which the air nozzle forming cover 3 is attached, and the turbine part 6a is supplied from the outside of the machine body 1 through a hose. By rotating with the compressed air, the rotary output shaft 6b of the air motor 6 connected to the rotary atomizing head 2 is driven to rotate, and the rotary atomizing head 2 is rotated.

機体1の内部には、外部塗料路7を通じて機体1に供給される塗料Tを回転霧化ヘッド2の塗料供給孔2aに導く内部塗料路8を設けてあり、この内部塗料路8のうち、その内部塗料路8に介装した塗料注入ノズル9以降の部分は、中空軸であるエアモータ6の回転出力軸6bの中央孔に挿通して回転霧化ヘッド2に渡らせた塗料供給チューブ10により形成してある。   Inside the machine body 1, there is provided an internal paint path 8 that guides the paint T supplied to the machine body 1 through the external paint path 7 to the paint supply hole 2 a of the rotary atomizing head 2. The part after the paint injection nozzle 9 interposed in the internal paint path 8 is inserted by a paint supply tube 10 which is inserted into the central hole of the rotation output shaft 6b of the air motor 6 which is a hollow shaft and passed to the rotary atomizing head 2. It is formed.

また、機体1の内部には、塗料帯電用の高電圧を発生する高電圧発生器11を内蔵してあり、この高電圧発生器11の電圧出力端11aはエアモータ6のタービン部6aに対して電気的に接続してある。   In addition, a high voltage generator 11 that generates a high voltage for charging the paint is built in the machine body 1, and a voltage output terminal 11 a of the high voltage generator 11 is connected to the turbine section 6 a of the air motor 6. It is electrically connected.

ここまでの構造は従来の直接帯電方式の静電塗装機とほぼ同じであり、直接帯電方式の静電塗装機では一般に、高電圧発生器11の電圧出力端11aを電気的に接続するエアモータ6のタービン部6a、そのタービン部6aと機械的に連結されたエアモータ6の回転出力軸6b、その回転出力軸6bを連結する回転霧化ヘッド2、並びに、その回転霧化ヘッド2に渡らせた塗料供給チューブ10の夫々を金属製にして、高電圧発生器11によるタービン部6aへの高電圧印加により、それら金属製の回転出力軸6b、回転霧化ヘッド2、塗料供給チューブ10にも高電圧が印加されるようにし、これにより、金属製の回転霧化ヘッド2及び塗料供給チューブ10を塗料帯電用の導電電極として、それら回転霧化ヘッド2及び塗料供給チューブ10に対する塗料Tの接触により噴霧前の塗料Tを帯電させるようにしている。   The structure up to this point is almost the same as that of a conventional direct charging type electrostatic coating machine. In general, the direct charging type electrostatic coating machine generally has an air motor 6 for electrically connecting the voltage output terminal 11a of the high voltage generator 11. The turbine part 6a, the rotary output shaft 6b of the air motor 6 mechanically connected to the turbine part 6a, the rotary atomizing head 2 connecting the rotary output shaft 6b, and the rotary atomizing head 2 Each of the paint supply tubes 10 is made of metal, and the high voltage generator 11 applies a high voltage to the turbine section 6a, so that the rotation output shaft 6b, the rotary atomizing head 2, and the paint supply tube 10 made of metal are also high. A voltage is applied so that the rotary atomizing head 2 made of metal and the paint supply tube 10 are used as conductive electrodes for charging the paint, and the rotary atomizing head 2 and the paint supply tube are charged. And so as to charge the paint T prior to spray by contact with paint T for 0.

これに対し、本例の誘導帯電方式の静電塗装機では、上記した直接帯電方式の静電塗装機に対する仕様変更として、エアモータ6の回転出力軸6b、回転霧化ヘッド2、塗料供給チューブ10の夫々を電気絶縁性の樹脂材で形成してある。   On the other hand, in the electrostatic charging machine of the inductive charging type of this example, the rotation output shaft 6 b of the air motor 6, the rotary atomizing head 2, and the paint supply tube 10 are changed as specifications of the above-described direct charging type electrostatic coating machine. Each of these is formed of an electrically insulating resin material.

即ち、これらエアモータ6の回転出力軸6b、回転霧化ヘッド2、塗料供給チューブ10の夫々を電気絶縁性の樹脂材で形成することで、直接帯電方式における上記導電電極は無くして、その代わりに、高電圧発生器11の電圧出力端11aが電気的に接続されているエアモータ6のタービン部6aを、機体1の内部において内部塗料路8の通過塗料Tとは電気的に非接触の状態で、図1に示す如く回転出力軸6b及びその内部の塗料供給チューブ10の部分を近接状態で全周にわたって囲む塗料帯電用の誘電電極部Xとして機能させるようにしてある。 That is, by forming each of the rotation output shaft 6b, the rotary atomizing head 2 and the paint supply tube 10 of the air motor 6 from an electrically insulating resin material, the conductive electrode in the direct charging method is eliminated, and instead. The turbine section 6a of the air motor 6 to which the voltage output terminal 11a of the high voltage generator 11 is electrically connected is electrically in contact with the passing paint T of the internal paint path 8 inside the machine body 1. As shown in FIG. 1, the rotary output shaft 6b and the paint supply tube 10 inside the rotary output shaft 6b are made to function as a dielectric electrode portion X for charging the paint that surrounds the entire circumference in a close state.

そして、この誘電電極部Xとしてのタービン部6aを高電圧発生器11による高電圧印加で高電圧の帯電状態にすることで、内部塗料路8における塗料供給チューブ10の部分を通過する塗料Tをその通過過程において高電圧帯電状態のタービン部6aによる静電誘導によりタービン6aに対する印加電圧の極性とは逆極性に効率良く帯電させて、その帯電塗料Tを回転霧化ヘッド2において被塗物に対し噴霧するようにしてある。 Then, the turbine portion 6a as the dielectric electrode portion X is charged to a high voltage state by applying a high voltage by the high voltage generator 11, so that the paint T passing through the portion of the paint supply tube 10 in the internal paint path 8 can be applied. In the passing process, the high-voltage charged state of the turbine unit 6a is electrostatically induced to efficiently charge the opposite polarity to the polarity of the voltage applied to the turbine 6a , and the charged paint T is applied to the object to be coated in the rotary atomizing head 2. In contrast, it is sprayed.

一方、タービン部6aを内蔵した機体先端部の外郭を形成するエアノズル形成カバー3は、回転霧化ヘッド2とともに電気絶縁性の樹脂材で形成してあり、これにより、それら回転霧化ヘッド2やエアノズル形成カバー3が帯電塗料Tとの接触やタービン部6aによる静電誘導などで高電圧を帯びる状態になること防止して、それら回転霧化ヘッド2及びエアノズル形成カバー3と他物ないし作業者との間でスパークが生じることを防止する。   On the other hand, the air nozzle forming cover 3 that forms the outline of the front end portion of the airframe incorporating the turbine portion 6a is formed of an electrically insulating resin material together with the rotary atomizing head 2, so that the rotary atomizing head 2 and The air nozzle forming cover 3 is prevented from being in a state of being charged with a high voltage due to contact with the charged paint T or electrostatic induction by the turbine section 6a, and the rotary atomizing head 2 and the air nozzle forming cover 3 and other objects or workers. Prevent sparks from occurring between

〔別実施形態〕
次に本発明の別実施形態を列記する。
[Another embodiment]
Next, other embodiments of the present invention will be listed.

前述の実施形態では、エアモータ6のタービン部6aを誘導電極部Xとする例を示した。 In the above-described embodiment, an example in which the turbine portion 6a of the air motor 6 is the induction electrode portion X has been described.

前述の実施形態では、回転霧化ヘッド2を噴霧部とする例を示した。 In the above-described embodiment, the example in which the rotary atomizing head 2 is used as the spray unit has been described.

前述の実施形態では高電圧発生器11を機体1に内蔵する例を示したが、高電圧発生器11は機体1の外部に配置するものであってもよい。   In the above-described embodiment, the example in which the high voltage generator 11 is built in the airframe 1 has been described, but the high voltage generator 11 may be disposed outside the airframe 1.

また、本発明の実施においては、誘導電極部Xによる静電誘導により塗料Tに生じる分極電荷のうち誘導電極部Xの印加電圧と同じ極性の分極電荷をアース部に導いて塗料Tから除去するアース電極を付加的に装備してもよい。   Further, in the implementation of the present invention, the polarization charge having the same polarity as the applied voltage of the induction electrode part X out of the polarization charge generated in the paint T by electrostatic induction by the induction electrode part X is guided to the ground part and removed from the paint T. An earth electrode may be additionally provided.

本発明よる静電塗装機は、水性塗料やメタリック塗料などの電気抵抗値が低い塗料を使用する場合に特に好適であるが、使用塗料Tは電気抵抗値が低い塗料に限られるものではなく、溶剤系塗料などの電気抵抗値の高い塗料であってもよい。   The electrostatic coating machine according to the present invention is particularly suitable when using a paint having a low electrical resistance value such as a water-based paint or a metallic paint, but the paint T used is not limited to a paint having a low electrical resistance value. It may be a paint having a high electric resistance value such as a solvent-based paint.

本発明による静電塗装機であれば、水性塗料やメタリック塗料などの電気抵抗値が低い塗料を使用する場合にも、供給塗料Tの連続性を断つ絶縁手段を不要にすることができるが、この絶縁手段は本発明の静電塗装機の実施において必ずしも省略する必要はなく、絶縁手段を備える状態で本発明による静電塗装機を実施してもよい。   If the electrostatic coating machine according to the present invention, even when using a paint having a low electrical resistance value such as a water-based paint or a metallic paint, an insulating means for cutting off the continuity of the supplied paint T can be made unnecessary. This insulating means is not necessarily omitted in the implementation of the electrostatic coating machine of the present invention, and the electrostatic coating machine according to the present invention may be implemented with the insulating means.

本発明による静電塗装機の塗装対象である被塗物は、自動車ボディや軌道車両のボディあるいは電気製品のケーシングや種々の物品など、静電塗装が可能なものであれば、どのようなものであってもよい。   The object to be coated by the electrostatic coating machine according to the present invention may be any object that can be electrostatically coated, such as an automobile body, a body of a track vehicle, a casing of an electric product, and various articles. It may be.

本発明による静電塗装機は、各種分野において種々の物品の静電塗装に利用することができる。   The electrostatic coating machine according to the present invention can be used for electrostatic coating of various articles in various fields.

7 外部塗料路
1 機体
T 塗料
2 噴霧部、回転霧化ヘッド
8 内部塗料路
11 高電圧発生器
X 誘導電極部(帯電手段)
6 エアモータ
6b 回転出力軸
10 塗料供給チューブ
4 シェーピングエア噴出部
3 エアノズル形成カバー
7 External paint path 1 Machine T Paint 2 Spraying section, rotary atomizing head 8 Internal paint path 11 High voltage generator X Induction electrode section (charging means)
6 Air motor 6b Rotation output shaft 10 Paint supply tube 4 Shaping air ejection part 3 Air nozzle formation cover

Claims (3)

外部塗料路を通じて機体に供給される塗料を機体先端の噴霧部に導く内部塗料路を機体の内部に設け、
前記噴霧部から外部に噴霧する塗料を高電圧発生器による発生電圧により帯電状態にする帯電手段を設けた静電塗装機であって、
前記帯電手段として、前記高電圧発生器による発生電圧を印加する誘導電極部を、前記内部塗料路の通過塗料とは電気的に非接触にした状態で機体の内部において前記内部塗料路の近傍に配置し、
前記高電圧発生器による電圧印加により前記誘導電極部を帯電状態にすることで静電誘導により前記内部塗料路の通過塗料を、前記誘導電極部に対する印加電圧の極性とは逆極性に帯電させて、この帯電塗料を前記噴霧部から噴霧する構成にし、
前記噴霧部として前記内部塗料路からの供給塗料を回転に伴う遠心力により外周縁部から飛散させる回転霧化ヘッドを設け、
前記機体の内部に設けたエアモータの回転出力軸を前記回転霧化ヘッドに連結して、このエアモータにより前記回転霧化ヘッドを回転させる構成にし、
前記内部塗料路を形成する塗料供給チューブを前記エアモータの回転出力軸における中央孔に挿通して前記回転霧化ヘッドに渡らせ、
この塗料供給チューブ及び前記エアモータの回転出力軸を電気絶縁材により形成し、
前記エアモータのタービン部は、前記機体の内部において前記内部塗料路の通過塗料とは電気的に非接触の状態で、前記回転出力軸及びその内部の前記塗料供給チューブを近接状態で全周にわたって囲む状態に配置し、
前記高電圧発生器の電圧出力端を前記タービン部に対して電気的に接続することで、前記タービン部を前記誘導電極部にしてある静電塗装機。
An internal paint path is installed inside the fuselage to guide the paint supplied to the fuselage through the external paint path to the spray section at the tip of the fuselage.
An electrostatic coating machine provided with charging means for charging the paint sprayed to the outside from the spraying portion with a voltage generated by a high voltage generator,
As the charging means, an induction electrode portion for applying a voltage generated by the high voltage generator is placed in the vicinity of the internal paint path inside the fuselage in a state where it is not in electrical contact with the paint passing through the internal paint path. Place and
By charging the induction electrode part with a voltage applied by the high voltage generator, the paint passing through the internal paint path is charged to a polarity opposite to the polarity of the applied voltage to the induction electrode part by electrostatic induction. , The charging paint is sprayed from the spraying part ,
As the spraying section, a rotary atomizing head that disperses the paint supplied from the internal paint path from the outer peripheral edge by centrifugal force accompanying rotation,
A rotary output shaft of an air motor provided inside the machine body is connected to the rotary atomizing head, and the rotary atomizing head is rotated by the air motor,
A paint supply tube forming the internal paint path is inserted through a central hole in the rotation output shaft of the air motor and passed to the rotary atomizing head;
The paint supply tube and the rotation output shaft of the air motor are formed of an electrical insulating material,
The turbine section of the air motor surrounds the rotation output shaft and the paint supply tube inside the entire circumference of the rotary output shaft and the paint supply tube in a state of being in non-contact with the passing paint of the internal paint path inside the airframe. Placed in a state,
An electrostatic coating machine in which a voltage output terminal of the high voltage generator is electrically connected to the turbine unit, whereby the turbine unit is used as the induction electrode unit .
前記回転霧化ヘッドを前記塗料供給チューブから供給される帯電状態の塗料に対する電気絶縁性を備える構成にしてある請求項1記載の静電塗装機。 The electrostatic coating machine according to claim 1, wherein the rotary atomizing head is configured to have electrical insulation against charged paint supplied from the paint supply tube . 前記エアモータの収容部である機体先端部の外郭を形成するとともに先端開口部を通じて外部に露出させた前記回転霧化ヘッドの外周部との間にシェービングエア噴出部を形成するエアノズル形成カバーを設け、
このエアノズル形成カバーを電気絶縁材で形成してある請求項1又は2記載の静電塗装機。
An air nozzle forming cover is provided that forms an outline of the front end of the airframe that is the housing portion of the air motor and forms a shaving air ejection portion between the outer periphery of the rotary atomizing head exposed to the outside through the front end opening,
The electrostatic coating machine according to claim 1 or 2, wherein the air nozzle forming cover is formed of an electrical insulating material .
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