EP1302245A1 - Pistolet de pulvérisation de poudre - Google Patents

Pistolet de pulvérisation de poudre Download PDF

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Publication number
EP1302245A1
EP1302245A1 EP02015213A EP02015213A EP1302245A1 EP 1302245 A1 EP1302245 A1 EP 1302245A1 EP 02015213 A EP02015213 A EP 02015213A EP 02015213 A EP02015213 A EP 02015213A EP 1302245 A1 EP1302245 A1 EP 1302245A1
Authority
EP
European Patent Office
Prior art keywords
high voltage
powder
shaft housing
spray gun
powder spray
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
Application number
EP02015213A
Other languages
German (de)
English (en)
Other versions
EP1302245B1 (fr
Inventor
Felix Mauchle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP1302245A1 publication Critical patent/EP1302245A1/fr
Application granted granted Critical
Publication of EP1302245B1 publication Critical patent/EP1302245B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 a powder spray gun for coating powder according to the Preamble of claim 1.
  • the well-known Powder spray gun can be attached to one robotic arm or lift stand or another be attached to a movable device or a stationary device.
  • a spray gun of a similar type for coating powder is known from US Pat. No. 4,993,645 known and contains a handle for manual handling.
  • Can be used as a manual pistol or as a machine-carried pistol Powder spray gun for coating powder is known from US 4,196,465. These Scripture also reveals details of one housed in the gun High-voltage generator. Such can also be arranged externally of the gun become. It usually contains an oscillator to convert a low one Input voltage into a low AC voltage, one to the AC side connected transformer for step-up the AC voltage, and a rectifier and capacitors or similar Cascade circuit containing acting elements to further Up-transformation of the electrical voltage and conversion to a high DC voltage, for example in the range between 2,000 V and 170,000 V for a or more high voltage electrodes of the electrostatic charging gun of the coating powder.
  • the coating powder contains not only larger powder particles, but also micro-sized powder particles. These tend to be in the chambers on the front Penetrate the end face of the shaft housing. This can lead to creepage currents, Short circuit and current flashovers from the high voltage path to other parts lead, which have a lower electrical potential, z. B. ground potential, especially when the coating powder of electrically conductive material exists or contains such.
  • the problem to be solved the penetration of Powder particles of the coating powder in the front end of chambers, which are formed by the shaft housing, and resulting disadvantages, too prevent or at least greatly reduce.
  • the invention relates to a powder spray gun for coating powder, containing a one-piece shaft housing made of plastic, which has a rear open Has front side and depending on there starting in the longitudinal direction of the shaft a powder feed tube channel, which in a front end of the Stem housing opens, and forms a high-voltage chamber, in which through the rear open front side in the shaft longitudinal direction
  • High voltage generator can be used to generate a high voltage for at least one high voltage electrode for electrostatic charging of the Coating powder, characterized in that the high-voltage chamber is closed at the front end of the shaft housing by the shaft housing and at least one electrical connection conductor is compressed gas-tight by this extends front end of the shaft housing therethrough, wherein the connecting conductor inside the high voltage chamber with the high voltage side of the High voltage generator is electrically connected or connectable and outside the shaft housing with an electrically conductive electrode connecting conductor connected or connectable to the high voltage supply to High voltage electrode.
  • the front end of the high voltage chamber is thus protected by the material of the Shaft housing itself completely closed.
  • the at least one electrode connecting conductor on the high voltage side of the high voltage generator Gas-tight through the shaft housing passed. He can either directly against the material of the shaft housing pressure air tight or by compressed air-tight sealant to be sealed on the shaft housing.
  • a High voltage generator and at least one high voltage current limiting resistor in a hull-shaped half shell made of electric insulating material, preferably plastic, are cast, wherein also the Potting material electrically insulating material, preferably plastic, is.
  • the entire unit of half-shell and cast-in parts is from the rear End face of the shaft housing can be used in its high-voltage chamber and interchangeable.
  • the shaft housing forms a sliding fit and one Longitudinal guide for this unit in the shaft longitudinal direction. Insulation material interfaces between the high voltage generator and the at least one Current limiting resistor are up to the front end of the shaft housing completely avoided.
  • powder spray gun according to the invention for Coating powder contains a one-piece shaft housing 2 made of electrical insulating plastic, which is preferably produced by injection molding.
  • the shaft housing 2 forms in an uninterrupted piece of material Powder supply tube channel 4, which extends in the longitudinal direction of the shaft and in a front end 6 of the shaft housing 2 opens, and a High-voltage chamber 8, extending in the shaft longitudinal direction through the shaft housing extends and for insertion of a high voltage generator 10 a Access opening 12 in the rear end face 14 has.
  • the high voltage chamber 8 is at its entire circumference and at the front End face 6 of the shaft housing 2 by the shaft housing 2 itself gas-tight locked.
  • An electrical connection conductor 16 extends through the Shaft housing 2 through and is within the high-voltage chamber 8 with the High voltage side 18 of the high voltage generator 10 electrically conductive connected or connectable and outside of the shaft housing 2 with a electrically conductive electrode connecting conductor 20 connected or connectable, around at least one high voltage electrode 22 high voltage for to supply electrostatic charge of the coating powder.
  • the electrical connection conductor 16 and the electrode connection conductor 20 can be soldered or plugged together or connected in any other way. Preferably, however, both are contacts that are contactable with each other. Of the Electrode connection conductor 20 may, for example, have a contact ring, so that he regardless of its rotational position with the connection conductor 16 is contactable.
  • the electrode connecting conductor 20 and the at least one High voltage electrode 22 can be used in various ways in parts of the Be housed powder spray gun.
  • Fig. 1 a spray nozzle 24, which the electrode connecting conductor 20 and the at least a high voltage electrode 22 carries.
  • the spray nozzle 24 is for example by a union nut 26, on the front shaft portion of the shaft housing second can be screwed, attached to the shaft housing 2.
  • the shaft housing 2 forms at its front end portion on the front end side with him integrally formed front end wall 28, which the high voltage chamber 8 on the front End face 6 limited pressure gas tight and through which the electrical connection conductor 16 extends gas-tight therethrough.
  • the high voltage side 18 of the high voltage generator 10 is by a High-voltage conduction path 30, which successively a Current limiting resistor 32, or more current limiting resistors, and a pressing on the inside of the electrical connection conductor 16, electrically conductive spring 34, preferably a compression spring, with this connection conductor 16 electrically connected.
  • the high voltage generator 10 consists for example of an oscillator 36 for Converting a low DC input voltage into an AC voltage, a transformer 38 for stepping up this AC voltage, and a cascade circuit 40 or other electrical circuit for Generation of the DC high voltage for the at least one High voltage electrode 22 from the AC voltage of the transformer 38th Die Cascade circuit 40 may be cascaded in a known manner Rectifiers and resistors included.
  • the current limiting resistor 32 and high voltage generator 10 are in one Block 42 made of electrically insulating material, preferably cast in plastic, which is close to the spring 34 and close to the front end wall 28th extends.
  • the at least one current limiting resistor 32 is located in one front end portion 2-2 of the shaft housing 2, which is a substantial has smaller cross-section than a central housing portion 2-4, in which the Cascade circuit 40 is housed.
  • the rear housing section 2-6 in which the transformer 38 and the oscillator 36 are housed, can if necessary, a larger cross-section than the central housing section 2-4 to have. In this way, the required mass of plastic for the Shaft housing 2 and for the potting compound, which forms the block 42, in each Section reduced to a minimum. This will also weight the entire Powder spray gun reduced to a minimum.
  • Fig. 1 is a scale enlarged view of a current powder spray gun according to the invention.
  • a ship-hull Half shell 50 made of electrically insulating material, preferably plastic provided in which the at least one current limiting resistor 32 and preferably the entire high voltage generator 10 in the plastic of the block 42 are poured.
  • This is in particular the cascade circuit 40, but preferably also the transformer 38 and preferably also the Oscillator 36.
  • the plastic ingot 42 is in the hull half shell 50 cast.
  • the half-shell 50 is at its front end portion, in front of the at least one Current limiting resistor 32, designed as a tube channel 52, in which the Compression spring 34 is partially inserted from the front and in which the contact head 48th on a forward facing channel shoulder surface 54 abuts the axial Clamping the compression spring 34 between the contact head 48 and the Connecting conductor 16.
  • the hull-like half shell forms at its rear end a transverse wall 55, which together with the shell bottom and the shell side walls over the entire cross-section of the high-voltage chamber 8 extends and at the Inner peripheral surface sealingly over the entire circumference, and preferably is additionally sealed by at least one sealing element 56.
  • transverse wall 55 of the hull half shell 50 By the transverse wall 55 of the hull half shell 50 are electrical Connection elements 58, 59, 60, z. B. pins for the Low voltage connection of an external cable to the oscillator 36th pressure gas tight passed.
  • the uninterrupted integrally formed shaft housing 2 forms in addition to High-voltage chamber 8 at least one, preferably at least two or according to the drawings three additional chambers 62, 64 and 66 and these separating partitions 68, 69, 70 and 71 surrounding the powder supply duct 4 are distributed around and depending on the open rear Front side 14 of the shaft housing 2 to a front transverse wall of the Shaft housing 2 extend, which is preferably the transverse wall 28, which is extends across all chambers and seals them tightly.
  • At least one of the additional chambers in the embodiment shown, the two arranged to the left and right of the powder feed tube channel 4 Additional chambers 62 and 64, are pressurized gas channels for supplying pressurized gas, z. B. Compressed air from the rear end of the shaft housing 2 through through holes 72nd or 74 in the front end wall 28 to a compressed air-tight thereto subsequent compressed air channel 76, through which compressed air on the at least a high voltage electrode 22 flows to keep them free of powder particles and to transfer their electrical charges to the powder particles.
  • another Additional channel 64 can be used as a compressed gas channel, the compressed gas, z. B. Compressed air via an opening 74 in the end wall 28 to one or more Compressed air channels 78 leads, from which then compressed air, the compressed gas on the sprayed coating powder jet flows.
  • the compressed gas channels 76 and / or 78, as shown in FIG. 1 in the nozzle 24th be formed. In other embodiments, they may be in another element be formed of the powder spray gun. Furthermore, the at least one High voltage electrode 22 radially instead of axially in the nozzle 24 or in a be arranged other part, for example, in the front end portion of the Shaft housing 2 in or at the edge of the powder supply pipe channel 4th
  • additional channel 66 can also for a Compressed gas supply or for the supply of another fluid or unused stay.
  • the additional chambers 62, 64, 66 and the partitions 68, 69, 70, 71 between all chambers 8, 62, 64, 66 radially to the shaft longitudinal direction an electrical isolation path to avoid electrical leakage currents or electric flashovers.
  • they have the advantage that the partitions and also the outer shell of the shaft housing 2 with very little material very thin can be formed and still high strength, rigidity and have electrical insulation effect.
  • the chambers 8, 62, 64 and 66 are preferably around the entire circumference of the powder feed tube 4 around arranged distributed.
  • the powder supply tube channel 4 can be used directly as a powder guide channel become. According to a preferred embodiment, however, a powder tube 84 is in it used interchangeably. This can occur when worn by the powder particles of the Coating powder or replaced for cleaning purposes. Further it can be made of a more abrasion-resistant plastic or abrasion-resistant other, electrically insulating material consist of the shaft housing 2. Furthermore, the Powder tube 84 for generating static electricity through the along it friction powder particles of the coating powder may be formed. To this Way and also by the interchangeability of the high voltage generator 10 and the poured half-shell 50 can use the powder spray gun using of the same shaft housing 2 to different needs in Powder coating operation can be adjusted.
  • the powder tube 84 can be attached in any manner, for example by a hollow screw 86, which in an internal thread 88 at the rear end of the Powder supply pipe channel 4 of the shaft housing 2 is screwed in and through which extends the powder tube 84 with axial sliding fit therethrough.
  • the Powder tube 84 may at its rear end with a connection element 90 for Attachment of a powder hose be provided.
  • a connecting piece 92 for Connection of a low-voltage cable not shown fastened by which a low voltage electrical via the pins 58, 59 and 60 the High voltage generator 10 can be fed.
  • the connector 92 may also by the hollow screw 86, or by other means, on the rear end side 14th be secured to the shaft housing 2, for example by the hollow screw 86th be stretched against the rear face 14.
  • a sealing plate 94 and a transition piece 96 are arranged, which the outer shape of the Shaft housing 2, the outer shape of the fitting 92 adapts.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP02015213A 2001-10-13 2002-07-09 Pistolet de pulvérisation de poudre Expired - Lifetime EP1302245B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10150759 2001-10-13
DE10150759.3A DE10150759B4 (de) 2001-10-13 2001-10-13 Pulverspritzpistole für Beschichtungspulver

Publications (2)

Publication Number Publication Date
EP1302245A1 true EP1302245A1 (fr) 2003-04-16
EP1302245B1 EP1302245B1 (fr) 2004-10-20

Family

ID=7702517

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02015213A Expired - Lifetime EP1302245B1 (fr) 2001-10-13 2002-07-09 Pistolet de pulvérisation de poudre

Country Status (8)

Country Link
US (1) US6935583B2 (fr)
EP (1) EP1302245B1 (fr)
JP (1) JP4327428B2 (fr)
AT (1) ATE279990T1 (fr)
CA (1) CA2407815C (fr)
DE (2) DE10150759B4 (fr)
ES (1) ES2230425T3 (fr)
MX (1) MXPA02010103A (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7793869B2 (en) * 2003-08-18 2010-09-14 Nordson Corporation Particulate material applicator and pump
JP4785744B2 (ja) * 2003-08-18 2011-10-05 ノードソン コーポレーション 自動粉体コーティングスプレーアプリケーター
US7216814B2 (en) * 2003-10-09 2007-05-15 Xiom Corp. Apparatus for thermal spray coating
DE102005017931A1 (de) * 2005-04-18 2006-10-19 Itw Gema Ag Pulversprühbeschichtungspistole und Pistolengehäuse hierzu
WO2014014502A1 (fr) * 2012-07-16 2014-01-23 Nordson Corporation Pistolet à poudre pouvant être configuré en vue d'une fourniture à partir d'un diffuseur ou d'une pompe à phase dense
US10239072B2 (en) * 2015-09-22 2019-03-26 Honda Motor Co. Ltd. Energy dissipation unit for high voltage charged paint system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599038A (en) * 1969-07-28 1971-08-10 Hipotronics Apparatus and systems for high-voltage electrostatic charging of particles
US3731145A (en) * 1970-11-23 1973-05-01 Nordson Corp Electrostatic spray gun with self-contained miniaturized power pack integral therewith
FR2219624A5 (fr) * 1973-02-27 1974-09-20 Air Ind
US4196465A (en) * 1977-12-08 1980-04-01 Gema Ag Apparatebau Electrostatic power coating gun
US4993645A (en) * 1989-02-14 1991-02-19 Ransburg-Gema Ag Spray coating device for electrostatic spray coating
FR2683162A1 (fr) * 1991-10-30 1993-05-07 Kremlin Appareil de pulverisation electrostatique.
US5759271A (en) * 1995-12-15 1998-06-02 Gema Volstatic Ag Spray coating device for electrostatic spray coating

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1006799B (it) * 1973-02-01 1976-10-20 Air Ind Cascata moltiplicatrice e fistola di spruzzatura elettrostatica a ca scata incorporata
DE8119946U1 (de) 1981-07-08 1982-09-09 Ernst Roederstein Spezialfabrik für Kondensatoren GmbH, 8300 Landshut Elektrostatische Beschichtungspistole
DE3243447C2 (de) * 1982-11-24 1984-09-20 Ransburg-Gema AG, St.Gallen Spritzvorrichtung zum elektrostatischen Beschichten von Gegenständen mit Beschichtungsmaterial
DE3545885C1 (de) * 1985-12-23 1993-03-04 Kopperschmidt Mueller & Co Elektrostatische Spruehpistole
FR2599281B1 (fr) * 1986-05-30 1988-08-12 Skm Sa Procede pour la realisation d'un pistolet electrostatique de pulverisation, et pistolet obtenu par ce procede.
DE4020289C1 (fr) * 1990-06-26 1991-12-12 Wagner International Ag, Altstaetten, Ch
GB2252262B (en) * 1991-01-22 1994-08-31 Honda Motor Co Ltd Structure for preventing current from leaking out of devices for electrostatic spray coating
DE19528398A1 (de) * 1995-08-02 1997-02-06 Gema Volstatic Ag Elektrostatische Sprühvorrichtung für Beschichtungsmaterial
US20030006321A1 (en) * 2001-07-06 2003-01-09 Mather Brian D. Tubular voltage multiplier powder gun

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599038A (en) * 1969-07-28 1971-08-10 Hipotronics Apparatus and systems for high-voltage electrostatic charging of particles
US3731145A (en) * 1970-11-23 1973-05-01 Nordson Corp Electrostatic spray gun with self-contained miniaturized power pack integral therewith
FR2219624A5 (fr) * 1973-02-27 1974-09-20 Air Ind
US4196465A (en) * 1977-12-08 1980-04-01 Gema Ag Apparatebau Electrostatic power coating gun
US4993645A (en) * 1989-02-14 1991-02-19 Ransburg-Gema Ag Spray coating device for electrostatic spray coating
FR2683162A1 (fr) * 1991-10-30 1993-05-07 Kremlin Appareil de pulverisation electrostatique.
US5759271A (en) * 1995-12-15 1998-06-02 Gema Volstatic Ag Spray coating device for electrostatic spray coating

Also Published As

Publication number Publication date
DE50201341D1 (de) 2004-11-25
MXPA02010103A (es) 2003-04-21
ATE279990T1 (de) 2004-11-15
DE10150759B4 (de) 2019-02-14
JP4327428B2 (ja) 2009-09-09
DE10150759A1 (de) 2003-04-17
CA2407815A1 (fr) 2003-04-13
CA2407815C (fr) 2008-12-30
US20030071143A1 (en) 2003-04-17
ES2230425T3 (es) 2005-05-01
EP1302245B1 (fr) 2004-10-20
JP2003117438A (ja) 2003-04-22
US6935583B2 (en) 2005-08-30

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