JPH0246267B2 - - Google Patents
Info
- Publication number
- JPH0246267B2 JPH0246267B2 JP57017892A JP1789282A JPH0246267B2 JP H0246267 B2 JPH0246267 B2 JP H0246267B2 JP 57017892 A JP57017892 A JP 57017892A JP 1789282 A JP1789282 A JP 1789282A JP H0246267 B2 JPH0246267 B2 JP H0246267B2
- Authority
- JP
- Japan
- Prior art keywords
- gun
- paint
- tip
- air
- outer cylinder
- 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.)
- Expired - Lifetime
Links
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Description
【発明の詳細な説明】
本発明は静電粉体塗装において、静電ガンへの
塗料付着を防止する装置に関するものであつて特
に予熱された被塗物を塗装する際、静電ガンへの
塗料の付着や融着を防止すると同時に、吹きかぶ
り現象の主因であるオーバースプレー塗料の再塗
着を防止するのに特に適した装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing paint from adhering to an electrostatic gun in electrostatic powder coating. The present invention relates to a device particularly suitable for preventing adhesion and fusing of paint, and at the same time, preventing reapplication of overspray paint, which is the main cause of the overspray phenomenon.
天然ガスや原油の大量輸送に使用される大径鋼
管の外面は、ポリエチレン樹脂で約10mm程度ライ
ニングされている。しかし、近年輸送の長距離化
にともない、耐熱性を持つた高性能の塗膜が所望
されている。この様な塗膜を形成する方法は、短
時間熱硬化型粉体塗料による静電粉体塗装法があ
る。大径鋼管の静電粉体塗装法の特徴は、予め被
塗物を適正な温度に予熱し、静電ガンにて短時間
熱硬化型塗料を、硬化後の塗膜厚で400〜600μｍ
相当塗着し、塗着と同時に硬化反応を進めること
である。従つて、形成された塗着層はブース滞留
中にかなり硬化する。その為に、ブース内で硬化
の進んだ膜にオーバースプレー塗料が吹きかぶつ
てキズ肌を生じたり、ガン等に付着していた塗料
が剥離落下してスビツトを発生する。斯様な塗膜
外観の欠陥は重大問題を発生することになる。 The outer surface of large-diameter steel pipes used for mass transportation of natural gas and crude oil is lined with approximately 10 mm of polyethylene resin. However, as transportation becomes longer distances in recent years, there is a demand for high-performance coatings with heat resistance. A method for forming such a coating film is an electrostatic powder coating method using a short-time thermosetting powder coating. The characteristics of the electrostatic powder coating method for large-diameter steel pipes are that the object to be coated is preheated to an appropriate temperature, and an electrostatic gun is used to apply thermosetting paint for a short time to a coating thickness of 400 to 600 μm after curing.
The method is to apply a considerable amount of paint and proceed with the curing reaction at the same time as the paint is applied. Therefore, the applied layer formed is considerably hardened during residence in the booth. As a result, overspray paint sprays onto the hardened film in the booth, causing scratches, and paint adhering to guns, etc., peels off and falls, causing scratches. Such defects in the appearance of the coating can cause serious problems.
以上述べた大径鋼管に短時間硬化型粉体塗料を
静電塗装ガンに於て塗装する際に生ずる問題点を
解決する方法は、オーバースプレー塗料を極力少
なくすることと、該オーバースプレー塗料の吹き
かぶりを防止することである。さらにこれが塗料
が高温雰囲気にある静電塗装ガンに付着したり、
融着したりするのを防止することである。 The method to solve the above-mentioned problems that occur when applying short-curing powder coatings to large-diameter steel pipes using an electrostatic coating gun is to minimize the amount of overspray paint and reduce the amount of overspray paint. The purpose is to prevent blow-over. Furthermore, this may cause the paint to adhere to the electrostatic paint gun, which is in a high-temperature atmosphere.
This is to prevent fusion.
従来からの塗装方法は、第２図、第３図に示す
ように塗装ブースａへ、予熱された鋼管ｂを適正
な速度で鋼管軸方向へ搬送し、該鋼管ｂの外側に
軸に向けて放射状に配された複数個のガンｃで連
続的に塗装し、オーバースプレー塗料をブース下
部ｄから吸引回収する法である。従つて、鋼管ｂ
の上部に配された静電塗装ガンc1，c2のオーバー
スプレー塗料の一部は、鋼管上面からの上昇気流
ｅに乗つて舞い上り、再度ガン先端付近に矢印ｆ
の如く到達する。到達した塗料はガンからの吐出
流ｇに巻き込まれ被塗物へ向う。すなわちオーバ
ースプレー塗料の一部はガンと被塗物の間を飛散
している。一方、鋼管下部に配された静電塗装ガ
ンからのオーバースプレー塗料はブースの吸引流
に引かれ、その一部は再びガン先端に矢印ｈの如
く舞いもどる。もどつた塗料はガンからの吐出流
に巻き込まれガンと被塗物の間を飛散している。
これら飛散塗料が塗着を完了し硬化の進んだ塗膜
面に吹きかぶれば、該塗膜面はザラザラ状のキズ
肌となる。 The conventional coating method involves transporting a preheated steel pipe b to a coating booth a at an appropriate speed in the axial direction of the steel pipe, as shown in Figs. This is a method in which paint is applied continuously using a plurality of radially arranged guns c, and overspray paint is collected by suction from the lower part of the booth d. Therefore, steel pipe b
A part of the overspray paint from the electrostatic painting guns c 1 and c 2 placed above the steel pipe flies up on the upward air current e from the top surface of the steel pipe, and returns to the tip of the gun near the tip of the arrow f.
reach as follows. The paint that has arrived is caught up in the discharge flow g from the gun and heads toward the object to be coated. In other words, some of the overspray paint is scattered between the gun and the object to be coated. On the other hand, the overspray paint from the electrostatic paint gun placed at the bottom of the steel pipe is drawn into the suction flow of the booth, and a portion of it returns to the tip of the gun as shown by arrow h. The stale paint gets caught up in the discharge stream from the gun and scatters between the gun and the object to be coated.
When these scattered paints are sprayed onto the surface of the cured coating film after completion of application, the coating surface becomes rough and scratched.
ブース内に配された静電塗装ガンは、鋼管から
の輻射伝熱によつてかなり昇温しているので、ガ
ンの先端や本体には飛散塗料が付着し、時間の経
過とともに融着固化する。ガンに付着または固着
した塗料は機械振動等の原因で剥離する場合もあ
り、これが形成された塗膜面に付着すればスビツ
トを発生する。さらにガン先端の荷電機構部に過
大に塗料が付着すれば、放電機能が劣化し塗着効
率が著しく低下する。この現象は以上述べた問題
点をますます促進する方向となり、外観が悪くな
るばかりか、所要の膜厚も得られなくなり、高性
能の塗膜を確保出来なくなる。 The electrostatic painting guns installed in the booth are heated considerably due to radiant heat transfer from the steel pipes, so scattered paint adheres to the tip and body of the gun, and over time it fuses and hardens. . Paint that has adhered or adhered to the gun may peel off due to mechanical vibrations, etc., and if this adheres to the surface of the coating film, it will cause spots. Furthermore, if too much paint adheres to the charging mechanism at the tip of the gun, the discharge function will deteriorate and the coating efficiency will drop significantly. This phenomenon tends to further accelerate the problems described above, and not only does the appearance deteriorate, but also the required film thickness cannot be obtained, making it impossible to ensure a high-performance coating film.
本発明は以上詳述した在来法で短期間硬化型塗
料を使用して、鋼管外面に所望の膜厚を塗装し、
塗膜外観の良い高性能合成樹脂膜を形成する静電
粉体塗装ガンを提供するものである。 The present invention uses the conventional method detailed above to coat the outer surface of a steel pipe with a desired film thickness using a short-curing paint,
To provide an electrostatic powder coating gun that forms a high-performance synthetic resin film with a good appearance.
本発明の静電粉体塗装ガンにおいては、静電塗
装ガンの少なくとも先端部を絶縁透気性部材で包
囲し、静電塗装ガンと該透気性部材から成る閉空
間に空気を圧送することによる。これによつて本
発明の目的を充分に達成することが出来る静電粉
体塗装ガンを得るに至つた、すなわち、第１図は
この発明の実施例の概略図を示したものである。
以下実施例について説明する。１は静電粉体塗装
ガン本体であり、これは従来公知のガンと内部構
造が同じであるので、その詳細な説明は省略す
る。ガン本体１は、気粉送流を供給する塗装ホー
ス２と、粉体を荷電するための電極への電源ケー
ブル３と、ガン本体１から吐出される粉体のスプ
レーパターンを調節するための空気及び電極の清
浄のための空気を供給する空気用チユーブ４とが
接続されている。 In the electrostatic powder coating gun of the present invention, at least the tip of the electrostatic coating gun is surrounded by an insulating air-permeable member, and air is forced into the closed space formed by the electrostatic coating gun and the air-permeable member. As a result, an electrostatic powder coating gun capable of fully achieving the object of the present invention has been obtained. That is, FIG. 1 shows a schematic diagram of an embodiment of the present invention.
Examples will be described below. Reference numeral 1 denotes an electrostatic powder coating gun body, which has the same internal structure as a conventionally known gun, so a detailed explanation thereof will be omitted. The gun body 1 includes a coating hose 2 for supplying air powder flow, a power cable 3 to an electrode for charging the powder, and an air hose 2 for adjusting the spray pattern of the powder discharged from the gun body 1. and an air tube 4 that supplies air for cleaning the electrodes.
５はガン本体１を包囲する外筒で、その先端部
５ａはガン本体１の先端部１ａの外周と接合する
よう絞つてある。 Reference numeral 5 denotes an outer cylinder surrounding the gun body 1, and its tip 5a is constricted so as to join with the outer periphery of the tip 1a of the gun body 1.
即ち、外筒５の先端部５ａは、先細の台形状に
形成され、その先端縁５ｃは前記ガン本体１の先
端部１ａの外周と接合されている。先端部５ａは
絶縁透気性部材からなつており、例えば焼結ポリ
エチレンや焼結ポリプロピレン等で形成される。
外筒５の円筒部５ｂは非透過性の部材で形成す
る。 That is, the tip 5a of the outer cylinder 5 is formed into a tapered trapezoidal shape, and its tip edge 5c is joined to the outer periphery of the tip 1a of the gun body 1. The tip portion 5a is made of an insulating, air-permeable member, such as sintered polyethylene or sintered polypropylene.
The cylindrical portion 5b of the outer cylinder 5 is made of a non-permeable material.
６はガン本体１を保持するための内筒で、ガン
本体１よりやや大き目の径に形成し、ガン本体１
の後部に嵌合したゴム等の支持具７と密に嵌合
し、ガン本体１を保持する。 6 is an inner cylinder for holding the gun body 1, which is formed to have a slightly larger diameter than the gun body 1;
The gun body 1 is held by tightly fitting into a support 7 made of rubber or the like fitted to the rear part of the gun body 1.
外筒５と内筒６の後端には夫々フランジ８，９
を設け、該フランジ８，９間にシートパツキン１
０を設け、ボルト、ナツト１１等でフランジ８，
９を接合する。 Flanges 8 and 9 are provided at the rear ends of the outer cylinder 5 and the inner cylinder 6, respectively.
A sheet packing 1 is provided between the flanges 8 and 9.
0, and tighten the flange 8, with bolts, nuts 11, etc.
Join 9.
１２は内筒６のフランジ９に設けた給気管で、
高圧送風機または空気圧縮機により、外筒５と内
筒６間の空間１３に高圧空気を供給する。 12 is an air supply pipe provided on the flange 9 of the inner cylinder 6;
High-pressure air is supplied to the space 13 between the outer cylinder 5 and the inner cylinder 6 by a high-pressure blower or an air compressor.
尚、図では示してないが、塗装ガンをブース内
に取り付ける場合、外筒５と同径の支持筒をブー
ス内に突設し、その支持筒に、外筒５及び内筒６
のフランジ８，９と同じ径及びボルト穴を有する
フランジを設けて取り付けるか、或は内筒６のフ
ランジ９をブースの内面と一体に連ながつた状
態、即ちブース内面に予め内筒を突設した状態に
して取り付ける等して適宜取り付けるものとす
る。 Although not shown in the figure, when installing the painting gun inside the booth, a support tube with the same diameter as the outer tube 5 is provided protruding into the booth, and the outer tube 5 and the inner tube 6 are attached to the support tube.
Either provide a flange with the same diameter and bolt holes as the flanges 8 and 9 of It shall be installed as appropriate, such as by attaching it in the condition where it is installed.
この塗装ガンをブース内に取り付け、粉体塗装
を行う場合、ガン本体１からの塗料の吹き付けと
同時に給気管１２から外筒５と内筒６間の空間１
３に清浄空気を圧送する。 When this paint gun is installed in a booth and powder coating is performed, the paint is sprayed from the gun body 1 and at the same time from the air supply pipe 12 to the space 1 between the outer cylinder 5 and the inner cylinder 6.
3. Pour clean air under pressure.
圧送された空気は外筒５の先端部５ａの表面よ
り矢印１４の方向に均一に排気される。この排気
風速を適正にすることによりブース内でこのガン
付近に飛散する塗料が排除され、塗料が外筒５の
先端部５ａに付着されない。さらにガン本体１か
らの吐出空気による飛散塗料の巻き込みも、この
先端部５ａから排気される空気により防止され
る。 The pressure-fed air is uniformly exhausted from the surface of the tip 5a of the outer cylinder 5 in the direction of the arrow 14. By optimizing the exhaust air speed, paint scattered around the gun in the booth is removed, and the paint does not adhere to the tip 5a of the outer cylinder 5. Further, the air exhausted from the tip portion 5a prevents the paint from being caught in the spray by the air discharged from the gun body 1.
また塗装ガンの先端は予熱された被塗物の輻射
熱により加熱されるが先端部５ａからの空気によ
り常に冷却されるので昇温することはない。 Further, the tip of the coating gun is heated by the radiant heat of the preheated object to be coated, but the temperature does not rise because it is constantly cooled by air from the tip 5a.
本塗装ガンをブース内で使用して、ゲルタイム
10sec／230℃の塗料にて被塗物鋼管に連続塗装し
た結果、膜厚400μｍで光沢の有する高性能塗膜
が得られ、またガン自体に塗料の付着は全くみら
れなかつた。 Use this paint gun in the booth to get gel time.
As a result of continuous coating on a steel pipe to be coated with paint at 10 seconds/230°C, a glossy, high-performance paint film with a film thickness of 400 μm was obtained, and no paint was observed to adhere to the gun itself.
この様に、この発明の静電粉体塗装ガンを使用
して短時間硬化型塗料を予熱された鋼管に塗装す
る場合には最適であり、かつ特にブース内で塗料
が滞留する場合、その塗料がガンに付着すること
を防止できる。 As described above, the electrostatic powder coating gun of the present invention is ideal for applying short-curing paint to preheated steel pipes, and is especially useful when paint accumulates in the booth. can be prevented from adhering to the gun.
要するに、本発明は、静電粉体塗装ガン本体の
外周を外筒で包囲し、その外筒の円筒部を非透過
性の部材で形成すると共に、その外筒の先端部を
絶縁性透気材により形成したので、外筒内に圧送
された空気は、外筒の先端部の表面からのみ排気
される。 In short, the present invention surrounds the outer periphery of the electrostatic powder coating gun body with an outer cylinder, the cylindrical part of the outer cylinder is made of a non-permeable material, and the tip of the outer cylinder is made of an insulating and air permeable material. Since it is made of material, the air forced into the outer cylinder is exhausted only from the surface of the tip of the outer cylinder.
即ち、外筒の円筒部の表面からは排気しないの
で、この表面から排気された場合の弊害、即ち、
外筒の先端部からの排気流の方向が円筒部側に変
化してしまう現象が発生することがない。又、外
筒の先端部を絶縁性透気部材により先細の台形状
に形成し、その先端縁を前記ガン本体の先端部の
外周と接合せしめたので、ガン本体と外筒間の空
間に供給された空気は、外筒の先端部により流れ
方向を変えられながら透過し、矢印１４方向に均
一に排出される。従つて、粉体放出パターンＰに
影響を及ぼすことがないので、均一な塗膜を効率
的に得ることができる。 In other words, since the air is not exhausted from the surface of the cylindrical part of the outer cylinder, there are no adverse effects if the air is exhausted from this surface, i.e.
A phenomenon in which the direction of the exhaust flow from the tip of the outer cylinder changes toward the cylindrical portion does not occur. In addition, the tip of the outer cylinder is formed into a tapered trapezoidal shape using an insulating air-permeable member, and the tip edge is joined to the outer periphery of the tip of the gun body, so that air is supplied to the space between the gun body and the outer cylinder. The air passes through the outer cylinder while its flow direction is changed by the tip of the outer cylinder, and is discharged uniformly in the direction of arrow 14. Therefore, since the powder release pattern P is not affected, a uniform coating film can be efficiently obtained.
又、外筒の先端部より排出される空気は、前記
ガン本体内を通る気粉送流に混入することがない
ので、塗着性を悪くすることはない。 Moreover, since the air discharged from the tip of the outer cylinder does not mix with the air powder flow passing through the gun body, the adhesion does not deteriorate.
第１図はこの発明の一実施例を示す断面図、第
２図は従来のブース内塗装の状態を示す正面断面
図、第３図は第２図の側面断面図である。
１……ガン本体、５……外筒、５ａ……先端
部、１２……給気管。
FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a front sectional view showing a state of conventional painting inside a booth, and FIG. 3 is a side sectional view of FIG. 2. 1... Gun body, 5... Outer cylinder, 5a... Tip, 12... Air supply pipe.
Claims (1)
し、その外筒の円筒部を非透過性の部材で形成す
ると共に、その外筒の先端部を絶縁性透気材によ
り先細の台形状に形成し、その先端縁を前記ガン
本体の先端部の外周と接合せしめ、前記ガン本体
と外筒間の空間に空気を供給する給気管を設けて
なる静電粉体塗装ガン。1 The outer periphery of the electrostatic powder coating gun body is surrounded by an outer cylinder, the cylindrical part of the outer cylinder is made of a non-permeable material, and the tip of the outer cylinder is made of an insulating air-permeable material with a tapered base. An electrostatic powder coating gun, which is formed into a shape, has its tip edge joined to the outer periphery of the tip of the gun body, and is provided with an air supply pipe for supplying air to a space between the gun body and the outer cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1789282A JPS58137457A (en) | 1982-02-06 | 1982-02-06 | Electrostatic powder applying gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1789282A JPS58137457A (en) | 1982-02-06 | 1982-02-06 | Electrostatic powder applying gun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58137457A JPS58137457A (en) | 1983-08-15 |
| JPH0246267B2 true JPH0246267B2 (en) | 1990-10-15 |
Family
ID=11956363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1789282A Granted JPS58137457A (en) | 1982-02-06 | 1982-02-06 | Electrostatic powder applying gun |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58137457A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3718154A1 (en) * | 1987-05-29 | 1988-12-08 | Gema Ransburg Ag | SPRAY UNIT WITH A ROTATIONAL SPRAY ORGAN |
| JPH01317562A (en) * | 1988-06-16 | 1989-12-22 | Asahi Okuma Ind Co Ltd | Protective apparatus against contamination with paint sprayed by electrostatic coating spray gun |
| JPH0725249Y2 (en) * | 1990-10-20 | 1995-06-07 | ダイハツ工業株式会社 | Air purging device for photoelectric tubes |
| ES2384130T3 (en) * | 2007-09-04 | 2012-06-29 | Shell Internationale Research Maatschappij B.V. | Spray nozzle manifold and process for cooling a hot gas using such an arrangement |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6035187B2 (en) * | 1978-03-07 | 1985-08-13 | 関西ペイント株式会社 | Spray gun for powder coating |
| JPS5513165A (en) * | 1978-07-17 | 1980-01-30 | Kansai Paint Co Ltd | Removal apparatus of powder particle |
-
1982
- 1982-02-06 JP JP1789282A patent/JPS58137457A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58137457A (en) | 1983-08-15 |
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