JPH06343903A - Friction charging gun for electrostatic coating - Google Patents
Friction charging gun for electrostatic coatingInfo
- Publication number
- JPH06343903A JPH06343903A JP13176493A JP13176493A JPH06343903A JP H06343903 A JPH06343903 A JP H06343903A JP 13176493 A JP13176493 A JP 13176493A JP 13176493 A JP13176493 A JP 13176493A JP H06343903 A JPH06343903 A JP H06343903A
- Authority
- JP
- Japan
- Prior art keywords
- charging tube
- wall surface
- charging
- powder coating
- needle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- 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
- B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、粉体塗料を摩擦によ
って帯電させる静電塗装用の摩擦帯電ガンに関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a triboelectric charging gun for electrostatic coating in which powder coating is charged by friction.
【０００２】[0002]
【従来の技術】摩擦帯電ガンは、非導電性樹脂製の帯電
チューブからなる。2. Description of the Related Art A triboelectric charging gun comprises a charging tube made of a non-conductive resin.
【０００３】そして、エアーによって搬送されてきた粉
体塗料がこの帯電チューブ内を高速で通過すると、粉体
塗料が帯電チューブの壁面に衝突、接触して、粉体塗料
と帯電チューブとの間で摩擦が生じ、それによって粉体
塗料が帯電する。When the powder coating material conveyed by air passes through the charging tube at a high speed, the powder coating material collides with and comes into contact with the wall surface of the charging tube, and between the powder coating material and the charging tube. Friction occurs, which causes the powder coating to become charged.
【０００４】摩擦帯電ガンは、このようにして粉体塗料
を帯電させるものであるが、粉体塗料が帯電した電荷と
等量の逆極性の電荷が帯電チューブの壁面に発生するた
め、粉体塗料を連続して帯電させるには、粉体塗料と帯
電チューブの壁面との摩擦により発生、蓄積される帯電
チューブの壁面の電荷を速やかに逃がす必要がある。The triboelectrification gun charges the powder coating material in this way. However, the same amount of electric charges of the opposite polarity as the electric charges charged by the powder coating material are generated on the wall surface of the charging tube. In order to continuously charge the paint, it is necessary to quickly release the electric charges on the wall surface of the charging tube, which are generated and accumulated due to the friction between the powder paint and the wall surface of the charging tube.
【０００５】このため、従来、帯電チューブの外周面
に、導電性塗料や導電材料（例えば、鉄、アルミ）を被
覆して導電層を形成し、この導電層から帯電チューブ内
に蓄積される電荷を逃がすようにしている。通常、帯電
チューブは、ポリテトラフロロエチレン等の弗素樹脂に
よって形成され、粉体塗料としてはエポキシ、アクリ
ル、ポリエステル等が使用されているので、粉体塗料は
正に帯電し、帯電チューブは負に帯電する。このため、
通常、帯電チューブの外周面の導電層に、アース線を接
続し、このアース線を経て帯電チューブの電荷を除去し
ている。Therefore, conventionally, the outer peripheral surface of the charging tube is coated with a conductive paint or a conductive material (for example, iron or aluminum) to form a conductive layer, and the charge accumulated in the charging tube from the conductive layer. Is trying to escape. Normally, the charging tube is made of a fluororesin such as polytetrafluoroethylene, and epoxy, acrylic, polyester, etc. are used as the powder coating, so the powder coating is positively charged and the charging tube is negatively charged. Get charged. For this reason,
Normally, a ground wire is connected to the conductive layer on the outer peripheral surface of the charging tube, and the charge of the charging tube is removed via this ground wire.
【０００６】[0006]
【発明が解決しようとする課題】ところで、このような
摩擦帯電ガンにおいて、粉体塗料に安定して電荷を供給
して、効率的に帯電させるには、帯電チューブの壁面で
発生した粉体塗料と逆極性の電荷を、できるだけ瞬時に
外周面の導電層を通じて逃がす必要がある。By the way, in such a triboelectric charging gun, in order to stably supply an electric charge to the powder coating material and efficiently charge it, the powder coating material generated on the wall surface of the charging tube is used. It is necessary to release the electric charge of the opposite polarity to the conductive layer on the outer peripheral surface as quickly as possible.
【０００７】ところが、帯電チューブは非導電性の樹脂
材料によって形成され、厚みがあるために、帯電チュー
ブの壁面で発生した電荷を、スムーズに取り除くことは
難しい。However, since the charging tube is made of a non-conductive resin material and has a large thickness, it is difficult to smoothly remove the charges generated on the wall surface of the charging tube.
【０００８】帯電チューブの厚みを薄くして帯電チュー
ブの壁面で発生した電荷を、外周面の導電層に流れやす
くしてもよいが、帯電チューブの厚みを薄くすると、帯
電チューブ自体の強度を維持できなくなるため、薄くす
るにも限度がある。Although it is possible to reduce the thickness of the charging tube so that the charges generated on the wall surface of the charging tube can easily flow to the conductive layer on the outer peripheral surface, reducing the thickness of the charging tube maintains the strength of the charging tube itself. There is a limit to how thin it can be because it cannot be done.
【０００９】そこで、この発明は、帯電チューブの肉厚
を薄くすることなく、帯電チューブの壁面で発生した電
荷を瞬時に除去することができるようにして、粉体塗料
への電荷の供給を効率的に行おうとするものである。Therefore, according to the present invention, the charge generated on the wall surface of the charging tube can be instantaneously removed without reducing the wall thickness of the charging tube, thereby efficiently supplying the charge to the powder coating material. It is something that is going to happen.
【００１０】[0010]
【課題を解決するための手段】この発明は、上記の課題
を解決するために、帯電チューブに、所定間隔で針状電
極を、導電層に接触し、かつ先端が帯電チューブの内壁
面から突出するように差し込んだ構成としたものであ
る。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a charging tube in which needle electrodes are contacted with a conductive layer at predetermined intervals and a tip of which projects from an inner wall surface of the charging tube. The configuration is such that it is inserted.
【００１１】[0011]
【作用】上記の構成により、帯電チューブの壁面で発生
した電荷は、その壁面に突き出た針状電極から外面の導
電層にスムーズに流れ、帯電チューブ内に電荷が蓄積さ
れなくなる。With the above structure, the charges generated on the wall surface of the charging tube smoothly flow from the needle-shaped electrode protruding on the wall surface to the conductive layer on the outer surface, and the charges are not accumulated in the charging tube.
【００１２】[0012]
【実施例】図１は、外周面に導電性塗料また導電材料
（例えば、鉄、アルミ）を被覆して形成した導電層２を
有する帯電チューブ１の一部を示している。FIG. 1 shows a part of a charging tube 1 having a conductive layer 2 formed by coating a conductive paint or a conductive material (for example, iron or aluminum) on the outer peripheral surface thereof.
【００１３】この帯電チューブ１は、ポリテトラフロロ
エチレン等の弗素樹脂によって形成され、外面側から針
状電極３が差し込まれており、その先端が帯電チューブ
１の内壁面から突出している。上記針状電極３は、例え
ば１００ｍｍのピッチで設けられている。The charging tube 1 is made of a fluororesin such as polytetrafluoroethylene, and the needle electrode 3 is inserted from the outer surface side, and the tip of the needle electrode 3 projects from the inner wall surface of the charging tube 1. The needle electrodes 3 are provided with a pitch of 100 mm, for example.
【００１４】上記導電層２には、電流計４を介してアー
ス線５が接続されている。A ground wire 5 is connected to the conductive layer 2 via an ammeter 4.
【００１５】上記帯電チューブ１内をエアーによって、
エポキシ、ポリエステル等の粉体塗料６を通過させる
と、摩擦によって粉体塗料６は正に帯電し、帯電チュー
ブ１の壁面にはそれと反対に負の電荷が発生するが、こ
の電荷は針状電極３から導電層２、電流計４を経てアー
ス線５へと流れて除去される。Air inside the charging tube 1 is
When the powder coating material 6 such as epoxy or polyester is passed, the powder coating material 6 is positively charged by friction, and negative charge is generated on the wall surface of the charging tube 1 in the opposite direction. 3 through the conductive layer 2 and the ammeter 4 to the ground wire 5 to be removed.
【００１６】次に、図２は、帯電チューブ１の壁面に突
き出した針状電極３の先端を、粉体塗料６の流れ方向の
前方、即ち、ガン先側に向けて屈曲させた例であり、こ
のようにすると、帯電チューブ１の壁面に発生する電荷
と針状電極３とがより接触しやすくなり、帯電チューブ
１の壁面の電荷の放出効果がよりよくなる。Next, FIG. 2 shows an example in which the tip of the needle-shaped electrode 3 protruding from the wall surface of the charging tube 1 is bent forward in the flow direction of the powder coating material 6, that is, toward the gun tip side. By doing so, the electric charge generated on the wall surface of the charging tube 1 and the needle-shaped electrode 3 are more easily brought into contact with each other, and the effect of discharging the electric charge on the wall surface of the charging tube 1 is further improved.
【００１７】（効果確認試験）この発明の効果を確認す
るために、ポリテトラフロロエチレン製の帯電チューブ
１に、針状電極３を差し込んで先端を帯電チューブ１の
内壁面に突き出した場合と、針状電極３を差し込んで先
端が帯電チューブ１の内壁面から突き出ないようにした
場合と、針状電極３を差し込まない場合とについて、粉
体塗料６の帯電量を測定したところ、表１、表２に示す
とおり、針状電極３を帯電チューブ１の内壁面に突き出
したこの発明の場合が、他の場合よりもアース線５に流
れる電流値が大きくなっており、粉体塗料６の帯電量が
大きいことが確認できた。(Effect confirmation test) In order to confirm the effect of the present invention, the case where the needle electrode 3 is inserted into the charging tube 1 made of polytetrafluoroethylene and the tip is projected to the inner wall surface of the charging tube 1, The charge amount of the powder coating material 6 was measured when the needle electrode 3 was inserted to prevent the tip from protruding from the inner wall surface of the charging tube 1 and when the needle electrode 3 was not inserted. As shown in Table 2, in the case of the present invention in which the needle-shaped electrode 3 is projected to the inner wall surface of the charging tube 1, the current value flowing through the ground wire 5 is larger than in other cases, and the powder coating material 6 is charged. It was confirmed that the amount was large.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【表２】 [Table 2]
【００２０】[0020]
【発明の効果】以上のように、この発明によれば、帯電
チューブの壁面で発生した電荷が瞬時に除去され、粉体
塗料への電荷の供給が効率的に行われるので、粉体塗料
の帯電量が増加するという効果がある。As described above, according to the present invention, the electric charge generated on the wall surface of the charging tube is instantly removed, and the electric charge is efficiently supplied to the powder coating material. This has the effect of increasing the amount of charge.
【００２１】また、摩擦帯電によって帯電した粉体塗料
の電界が、帯電チューブの内面に突き出る針状電極によ
ってガン内部で取り除かれるため、被塗装物の凹部にも
粉体塗料が入り込みやすくなり、また逆電離による塗面
の肌荒れを少なくすることができるという効果もある。Further, since the electric field of the powder coating material charged by frictional charging is removed inside the gun by the needle-shaped electrode protruding on the inner surface of the charging tube, the powder coating material easily enters the concave portion of the object to be coated, and There is also an effect that it is possible to reduce the roughness of the coated surface due to reverse ionization.
【図１】この発明の第一の実施例を示す概略図FIG. 1 is a schematic diagram showing a first embodiment of the present invention.
【図２】この発明の第二の実施例を示す概略図FIG. 2 is a schematic diagram showing a second embodiment of the present invention.
【符号の説明】 １ 帯電チューブ ２ 導電層 ３ 針状電極 ４ 電流計 ５ アース線 ６ 粉体塗料[Explanation of symbols] 1 charging tube 2 conductive layer 3 needle electrode 4 ammeter 5 ground wire 6 powder coating
Claims (1)
ューブの外面に、導電層を設けた静電塗装用摩擦帯電ガ
ンにおいて、上記帯電チューブに、所定間隔で針状電極
を、導電層に接触し、かつ先端が帯電チューブの内壁面
から突出するように差し込んだことを特徴とする静電塗
装用摩擦帯電ガン。1. A friction charging gun for electrostatic coating, wherein a conductive layer is provided on the outer surface of a charging tube made of a non-conductive resin. In the charging tube, needle electrodes are contacted with the conductive layer at predetermined intervals. The electrostatic charging gun for electrostatic painting is characterized in that the tip is inserted so as to protrude from the inner wall surface of the charging tube.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13176493A JP3411330B2 (en) | 1993-06-02 | 1993-06-02 | Friction electrification gun for electrostatic painting |
| US08/251,965 US5400976A (en) | 1993-06-02 | 1994-06-01 | Frictional electrification gun |
| DE69408035T DE69408035T2 (en) | 1993-06-02 | 1994-06-01 | Triboelectric spray gun |
| EP94108483A EP0627265B1 (en) | 1993-06-02 | 1994-06-01 | Frictional electrification gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13176493A JP3411330B2 (en) | 1993-06-02 | 1993-06-02 | Friction electrification gun for electrostatic painting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06343903A true JPH06343903A (en) | 1994-12-20 |
| JP3411330B2 JP3411330B2 (en) | 2003-05-26 |
Family
ID=15065626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13176493A Expired - Fee Related JP3411330B2 (en) | 1993-06-02 | 1993-06-02 | Friction electrification gun for electrostatic painting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3411330B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007152237A (en) * | 2005-12-06 | 2007-06-21 | Kurosaki Harima Corp | Spraying device, spraying method and undeterminate form fire-resistant material |
-
1993
- 1993-06-02 JP JP13176493A patent/JP3411330B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007152237A (en) * | 2005-12-06 | 2007-06-21 | Kurosaki Harima Corp | Spraying device, spraying method and undeterminate form fire-resistant material |
| JP4638813B2 (en) * | 2005-12-06 | 2011-02-23 | 黒崎播磨株式会社 | Spray construction device and spray construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3411330B2 (en) | 2003-05-26 |
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