EP0547397B1 - Elektrostatische Pulver-Beschichtungspistole - Google Patents
Elektrostatische Pulver-Beschichtungspistole Download PDFInfo
- Publication number
- EP0547397B1 EP0547397B1 EP92119738A EP92119738A EP0547397B1 EP 0547397 B1 EP0547397 B1 EP 0547397B1 EP 92119738 A EP92119738 A EP 92119738A EP 92119738 A EP92119738 A EP 92119738A EP 0547397 B1 EP0547397 B1 EP 0547397B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- high voltage
- duct
- electrode
- barrel
- 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
Images
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
- B05B5/053—Arrangements for supplying power, e.g. charging power
- B05B5/0531—Power generators
-
- 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
- B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
- B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
Definitions
- the invention relates to an electrostatic powder coating gun according to the preamble of patent claim 1.
- the powder-air mixture is fed through the handle or adjacent to the handle, the powder channel then being guided through the entire length of the gun barrel.
- the high-voltage generator sits parallel to the powder channel, be it in or on the handle or in or on the gun barrel.
- this results in a long flow path for the powder-air mixture within the gun, so that a high pressure is required for the air conveying the powder in order to overcome the flow resistance in the gun.
- the flow through the long powder channel results in a comparatively high wear of parts due to abrasion.
- the juxtaposition of the powder duct and the high-voltage generator means that either the handle or the gun barrel must be dimensioned comparatively large.
- the object of the present invention is to provide an electrostatic powder coating gun in which the flow path of the powder-air mixture within the gun is comparatively short, so that flow resistance and abrasion are reduced, and the handle and gun barrel can be made slim.
- the solution to this problem results from the characterizing features of patent claim 1.
- the powder channel is very short and only occupies the foremost area of the gun barrel.
- the formation of the powder channel as a torus with a tangential junction of the powder-air mixture supply and with a diffuser tube piece adjoining the torus results in particularly favorable flow conditions.
- the consequence of these measures is that the pressure of the conveying air is comparatively low and the abrasion on the channel wall is extremely low.
- the space in the gun tube behind the powder channel is fully available to the high-voltage generator, so that the gun barrel can be made very slim; the same applies to the pistol grip if it is a manual pistol.
- the area of the walls on which powder particles can be deposited is reduced and the deposition of powder particles is additionally minimized by the tangential flow with an inclined position.
- a particularly useful development of the invention is characterized in claim 2.
- the high-voltage generator is flushed with compressed air so that static charges do not occur, and this flushing air then still serves to keep the electrode free of powder deposits.
- the foremost region of the gun barrel 10 of the electrostatic powder coating gun according to the invention shown in FIG. 1 consists of the barrel main part 10a and the barrel extension 10b screwed onto its mouth part.
- the barrel main part 10a is closed at its mouth end by a cover wall 12 which is integral with the barrel, the cover wall 12 having a central bore 12a into which an electrode support tube 13 projecting forward is tightly inserted.
- a central high-voltage generator 14 is located in the barrel main part, the outside diameter of which is slightly smaller than the inside diameter of the tubular barrel main part 10 a, such that an annular gap 15 remains free.
- the high-voltage generator 14 has spacer feet 14a, which ensure that a gap 16 remains free between the front end of the high-voltage generator 14 and the top wall 12, which is on the one hand with the annular gap 15 and on the other hand with the interior 13a of the electrode support tube 13 in open connection.
- the barrel extension 10b has essentially the shape of a cylinder, the rear part of which is designed as a tubular piece spanning the barrel main part 10a; this piece of pipe has an internal thread, with the aid of which the barrel extension 10b can be screwed onto the external thread of the barrel main part 10a. Furthermore, the barrel extension 10b has a central inner bore, through which the electrode support tube 13 is passed axially to the front. In the middle region of the barrel extension 10b, a torus powder channel 17 is cut into the concentrically surrounding the electrode support tube 13, which continues in the forward direction into a ring powder channel 18, which diffuses like a widening on the front forehead of the extension 10b opens outwards. An inlet nozzle 19, into which a feed tube (not shown) for the powder-air mixture can be connected, opens into the torus powder duct 17 tangentially and with a sloping position in the forward direction.
- the powder coating gun works as follows. About the supply hose, not shown, a powder-air mixture is introduced in the direction of arrow B through the connecting piece 19 spirally tangentially into the torus powder channel 17, from which the mixture reaches the annular channel 18 and flows through it to the outside . Due to the diffuser-like expansion of the ring channel 18 and the action of the impact body 20, a powder cloud that rises very early is generated, which favors both the charging and the transport of the powder. The powder is charged by the electrode 21, which, as mentioned, is connected to high voltage. Compressed air is supplied as purging air from the rear region of the coating gun, not shown, in the direction of arrows A.
- This purging air passes through the annular gap 15 and passes through the end gap 16 and the interior of the electrode carrier tube 13 into the channels 22, which are there as fine air jets surrounding the electrode 21. This purging air ensures that static charges are dissipated in the area of the gaps 15, 16 and that they are kept clean in the area of the electrode 21.
- Fig. 3 shows a modification for the achievement of a powder flat jet.
- the orifice ring 24 used there is replaced by a cap 30 with a slot nozzle 31 through which the electrode needle 21 projects.
- the impact body 20 is also omitted in this embodiment.
- the compressed air emerging from the interior of the electrode support tube 13 and washing around the electrode needle 21 is of great importance, because here it not only prevents contamination of the electrode needle, but above all prevents the nozzle slot 31 from becoming clogged.
- the gun barrel 10 consists of two detachable parts, namely the main part 10a and the extension 10b; Compared to a one-piece gun barrel, however, the subdivision shown gives the advantages of easier manufacture and, above all, easier disassembly and cleaning of the gun.
- the annular channel 18 can also have a constant diameter over its entire length, even narrow towards the mouth.
- the high-voltage generator 14 can also only be the final stage (cascade) of the generator circuit.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4141663A DE4141663C2 (de) | 1991-12-17 | 1991-12-17 | Elektrostatische Pulver-Beschichtungspistole |
DE4141663 | 1991-12-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0547397A1 EP0547397A1 (de) | 1993-06-23 |
EP0547397B1 true EP0547397B1 (de) | 1995-06-21 |
Family
ID=6447283
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92119738A Expired - Lifetime EP0547397B1 (de) | 1991-12-17 | 1992-11-19 | Elektrostatische Pulver-Beschichtungspistole |
Country Status (9)
Country | Link |
---|---|
US (1) | US5482214A (ja) |
EP (1) | EP0547397B1 (ja) |
JP (1) | JPH05245416A (ja) |
CZ (1) | CZ281696B6 (ja) |
DE (2) | DE4141663C2 (ja) |
DK (1) | DK0547397T3 (ja) |
ES (1) | ES2073845T3 (ja) |
HU (2) | HU215134B (ja) |
PL (1) | PL170193B1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR960007018A (ko) * | 1994-08-17 | 1996-03-22 | 이마무라 가즈스께 | 정전 파우더 도장 방법과 장치 |
DE19709786A1 (de) * | 1997-03-10 | 1998-02-12 | Gema Volstatic Ag | Elektrostatische Pulversprühvorrichtung |
US6377768B1 (en) | 1997-06-12 | 2002-04-23 | OCé PRINTING SYSTEMS GMBH | Device and method for inking a charge pattern using a toner spraying device |
WO1999018032A1 (en) * | 1997-10-06 | 1999-04-15 | Hosokawa Micron International, Inc. | Method and apparatus for vapor phase manufacture of nanoparticles |
US20050098659A1 (en) * | 2002-09-27 | 2005-05-12 | Milojevic Dragoslav K. | Swirl gun for powder particles |
US6874712B2 (en) * | 2002-09-27 | 2005-04-05 | Abb Inc. | Swirl gun for powder particles |
KR100959507B1 (ko) * | 2009-12-23 | 2010-05-27 | 한국희 | 분체도장장치 및 이를 이용한 도장방법 |
CN107262320B (zh) * | 2017-06-26 | 2023-08-29 | 中信戴卡股份有限公司 | 一种混线式轮毂螺栓孔自动清粉系统及组合式清粉枪 |
WO2023232199A2 (de) | 2022-06-03 | 2023-12-07 | P+S Pulverbeschichtungs- Und Staubfilteranlagen Gmbh | Verfahren zum ausbringen von pulver und pulversprühdüse zur durchführung des verfahrens |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5056720A (en) * | 1990-09-19 | 1991-10-15 | Nordson Corporation | Electrostatic spray gun |
Family Cites Families (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1005450A (fr) * | 1947-07-22 | 1952-04-10 | Procédé et dispositif pour la pulvérisation de tous liquides et le fibrage de matières thermoplastiques | |
CH496481A (de) * | 1969-06-25 | 1970-09-30 | Gema Ag App Bau | Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit zerstäubten Feststoffpartikeln |
US3901184A (en) * | 1974-07-23 | 1975-08-26 | Continental Can Co | Pneumatic powder flow diverting device |
JPS5243846A (en) * | 1975-10-03 | 1977-04-06 | Senichi Masuda | Device for electrostatic powder coating |
US4380320A (en) * | 1981-02-25 | 1983-04-19 | Nordson Corporation | Electrostatic powder spray gun nozzle |
ES517085A0 (es) * | 1982-11-03 | 1983-10-16 | Fusco Lupo Jose De | Perfeccionamientos introducidos en pistolas electrostaticas. |
US4462061A (en) * | 1983-06-29 | 1984-07-24 | Graco Inc. | Air turbine drive for electrostatic spray gun |
US4634058A (en) * | 1984-12-13 | 1987-01-06 | Nordson Corporation | Powder spray gun |
DE3514523A1 (de) * | 1985-04-22 | 1986-10-23 | Ransburg-Gema AG, St. Gallen | Verfahren und vorrichtung zum elektrostatischen beschichten von gegenstaenden mit pulverfoermigem beschichtungsmaterial |
DE3529703C1 (de) * | 1985-08-20 | 1986-08-28 | Ransburg-Gema AG, St. Gallen | Spruehvorrichtung zur elektrostatischen Pulverbeschichtung |
US4819879A (en) * | 1985-10-25 | 1989-04-11 | Nordson Corporation | Particle spray gun |
DE3545885C1 (de) * | 1985-12-23 | 1993-03-04 | Kopperschmidt Mueller & Co | Elektrostatische Spruehpistole |
DE3546231A1 (de) * | 1985-12-27 | 1987-07-02 | Gerhard Hestermann | Pulver-spruehpistole |
ES2019888B3 (es) * | 1986-03-13 | 1991-07-16 | Ransburg-Gema Ag | Pulverizadora electrostatica para polvos de revestimiento. |
DE3608415A1 (de) * | 1986-03-13 | 1987-09-24 | Gema Ransburg Ag | Elektrostatische sprueheinrichtung fuer beschichtungspulver |
DE3644840A1 (de) * | 1986-04-04 | 1987-10-15 | Wagner Int | Elektrostatische pulver-spruehpistole |
DE3611577A1 (de) * | 1986-04-07 | 1987-10-15 | Wagner Int | Elektrostatische pulver-spruehpistole |
US4772982A (en) * | 1986-11-13 | 1988-09-20 | Hideo Nagasaka | Powder charging apparatus and electrostatic powder coating apparatus |
US4784331A (en) * | 1987-05-27 | 1988-11-15 | Nordson Corporation | Electrostatic spray gun device and cable assembly |
US4830279A (en) * | 1987-09-21 | 1989-05-16 | Nordson Corporation | Flat spray nozzle for a spray gun |
DD271611A3 (de) * | 1987-10-27 | 1989-09-13 | Verkehrswesen Hochschule | Spruehpistole mit elektrokinetischer pulveraufladung |
DE4005350A1 (de) * | 1990-02-20 | 1991-08-22 | Wagner Int | Duesenvorsatz fuer pulverspruehpistolen |
-
1991
- 1991-12-17 DE DE4141663A patent/DE4141663C2/de not_active Expired - Fee Related
-
1992
- 1992-11-19 EP EP92119738A patent/EP0547397B1/de not_active Expired - Lifetime
- 1992-11-19 DK DK92119738.0T patent/DK0547397T3/da active
- 1992-11-19 ES ES92119738T patent/ES2073845T3/es not_active Expired - Lifetime
- 1992-11-19 DE DE59202614T patent/DE59202614D1/de not_active Expired - Fee Related
- 1992-12-11 HU HU9203924A patent/HU215134B/hu not_active IP Right Cessation
- 1992-12-11 HU HU9203924A patent/HU9203924D0/hu unknown
- 1992-12-14 PL PL92297008A patent/PL170193B1/pl unknown
- 1992-12-16 CZ CS923698A patent/CZ281696B6/cs not_active IP Right Cessation
- 1992-12-17 US US07/991,504 patent/US5482214A/en not_active Expired - Fee Related
- 1992-12-17 JP JP4337435A patent/JPH05245416A/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5056720A (en) * | 1990-09-19 | 1991-10-15 | Nordson Corporation | Electrostatic spray gun |
Also Published As
Publication number | Publication date |
---|---|
US5482214A (en) | 1996-01-09 |
DE4141663C2 (de) | 1996-09-19 |
DE59202614D1 (de) | 1995-07-27 |
DK0547397T3 (da) | 1995-08-21 |
ES2073845T3 (es) | 1995-08-16 |
HU215134B (hu) | 1998-09-28 |
HU9203924D0 (en) | 1993-03-29 |
CZ281696B6 (cs) | 1996-12-11 |
PL170193B1 (pl) | 1996-11-29 |
HUT64490A (en) | 1994-01-28 |
JPH05245416A (ja) | 1993-09-24 |
EP0547397A1 (de) | 1993-06-23 |
CZ369892A3 (en) | 1993-07-14 |
DE4141663A1 (de) | 1993-06-24 |
PL297008A1 (en) | 1993-09-20 |
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