EP1283074A2 - Dispositif de pulvérisation de poudre - Google Patents

Dispositif de pulvérisation de poudre Download PDF

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Publication number
EP1283074A2
EP1283074A2 EP02012881A EP02012881A EP1283074A2 EP 1283074 A2 EP1283074 A2 EP 1283074A2 EP 02012881 A EP02012881 A EP 02012881A EP 02012881 A EP02012881 A EP 02012881A EP 1283074 A2 EP1283074 A2 EP 1283074A2
Authority
EP
European Patent Office
Prior art keywords
powder
compressed air
air outlet
channel
spray coating
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.)
Withdrawn
Application number
EP02012881A
Other languages
German (de)
English (en)
Other versions
EP1283074A3 (fr
Inventor
Karl Buschor
Felix Mauchle
Hanspeter Vieli
Silvano Gelain
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 EP1283074A2 publication Critical patent/EP1283074A2/fr
Publication of EP1283074A3 publication Critical patent/EP1283074A3/fr
Withdrawn legal-status Critical Current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
    • B05B5/03—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
    • 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
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes

Definitions

  • the invention relates to a powder spray coating device according to the Preamble of claim 1.
  • the invention further relates to a powder spray coating method according to the Preamble of claim 10.
  • US 4,289,278 shows various powder spray coating devices thereof Type in which an annular slot-shaped compressed air outlet upstream and / or downstream of an electrode holder web for a high voltage electrode in the Powder channel opens.
  • the coating powder is sprayed through Flow stall at the end of the powder channel and / or through a funnel-like opening channel mouth and / or through one in the center of the powder stream Deflection body or impact body arranged downstream of the powder channel.
  • This can be used with one or more high voltage electrodes for electrostatic Charging of the coating powder may be provided, whereas one in the air flow of the compressed air outlet arranged electrode is connected to earth potential, so that from the high voltage electrode to the ground electrode is a unipolar Corona discharge can take place.
  • DE 195 42 863 A1 shows a powder spray coating device with a Powder flow centrally located ground electrode and with downstream of it high-voltage electrodes projecting inwards from the powder channel wall.
  • the Electrodes can be placed in an air stream to avoid deposit powder particles on them.
  • EP 1 008 392 A2 shows one Powder spray coating device with a powder channel, in the an elongated center body is arranged downstream, the downstream end section is expanded like a funnel and together with the Powder duct wall forms a powder duct section which is annular in cross section.
  • compressed air is formed at several points to form one around the Center body rotating powder and compressed air vortex initiated.
  • the object of the invention is to achieve the coating quality and to improve coating efficiency.
  • the amount and / or the pressure of the compressed air, which according to the invention the swirling of the Powder flow to achieve the advantages mentioned is preferably through a computerized control unit and / or through a network to which the Control units connected by several powder spray coating devices are, adjustable, controllable and / or regulatable, depending on the embodiment in the Practice.
  • a kind of “compressed air aperture” is produced with the compressed air essentially crossing the entire powder flow path radial air curtain exists. Its air volume and air pressure are measured so that the compressed air flow completely penetrates the powder channel in the transverse direction and thereby forming a kind of closed aperture, which from the powder flow to a "open aperture” can be pressed open.
  • the "compressed air screen” causes a detachment the powder flow boundary layer from the powder channel wall, a displacement of the Powder particles swirl radially inwards and after the "compressed air orifice” radially outwards as on the back of a mechanical cover.
  • Fig. 1 shows a spray coating device according to the invention, with a Powder tube 2, which defines a powder channel 4, on its downstream one At the end 6, a compressed air outlet 8 is formed, which is the powder flow path surrounds like a ring.
  • the compressed air outlet 8 can pass through the powder flow path ring-shaped nozzle slot or through a variety of nozzle openings be formed, which surround the powder flow path like a ring.
  • Fig. 1 shows one annular nozzle slot. This is with an annular distribution channel 10 in Flow connection, which via a compressed air line 12 with a Compressed air source 14 is connected, which, for. B. a compressed air regulator, an adjustable Air valve or a compressed air network can be.
  • the compressed air source 14 is preferably controlled by a computer-assisted control device 16 Setting the pressure and the amount of compressed air 15, which the Compressed air outlet 8 is supplied.
  • the coating powder is pneumatically in the form of a powder stream 18 promoted the powder channel 4 and sprayed at its downstream end 6 or atomized.
  • the stall of the Sufficient powder flow at the opening edge of the powder channel 4 and / or additional atomizer element may be provided, for example a Rotary bell or other rotary atomizer element or a non-rotating, preferably conical or bell-like in the downstream direction becoming baffle plate 20.
  • the baffle plate 20 is at the front end of a Carrier rod 22 which is fastened in the powder channel 4 by a carrier web 24.
  • the Carrier rod 22 and the carrier web 24 have a substantially smaller width than that Diameter of the powder channel 4, so that the coating powder 18 on them can flow past.
  • the compressed air outlet 8 is located with respect to the powder flow direction downstream of the carrier web 24, so that this from the compressed air flow generated powder homogeneity can not destroy.
  • the Powder upstream and / or downstream of the Powder channel end 6 there is at least one high-voltage electrode 26 which for electrostatically charging the coating powder to a DC high voltage source 28 is connected.
  • This can be located internally or externally of the powder spray coater, which commonly referred to as a "pistol” regardless of whether it is a hand-held, pistol-like device or around a machine-borne one Device acts.
  • the DC voltage is preferably in the range between 10 kV and 140 kV.
  • the at least one high voltage electrode 26 is in the center on the front of the impact body 20. It is through a high voltage line 27, which extends through the support rod 22 and the support web 24, with the High voltage source 28 connected.
  • some or more electrodes 29 can flow in the compressed air be arranged. This can in turn be connected to high voltage High voltage electrode like electrode 16 or one at ground potential connected earth electrode for discharging electrical charges.
  • the compressed air outlet 8 is through a plurality of radial bores formed, the powder path in a downstream channel section 4-2 ring-like surrounded which one opposite an upstream channel section 4-3 has an enlarged passage cross section and is free of internals such as the Baffle support device 22, 24 of FIG. 1.
  • the downstream end 6 of the Powder channel 4 is formed by a slot nozzle.
  • a high voltage electrode 32 is arranged in the atomizer slot 30 . It is about one High-voltage line 27 connected to a high-voltage generator 28.
  • the at least one high voltage electrode 32 can be in an air duct 34 be arranged through which compressed air into the powder stream of Atomizer slot 30 flows. This compressed air can be the compressed air source 14 be removed, for example via a pressure reducer or Pressure regulator or a throttle.
  • the compressed air outlet 8 is located upstream of the carrier web 24.
  • the powder is atomized by stalling at the channel edge on downstream end 6 of the powder channel 4.
  • the compressed air outlet 8 is located only a short distance upstream of the downstream powder channel end 6 and is designed as a nozzle slot. According to another embodiment, a A large number of nozzle bores are arranged in a ring.
  • a plurality of high voltage electrodes 38 are arranged in a ring.
  • They are, although in Fig. 4 not shown, preferably arranged in air channels, corresponding to FIG. 2, the Compressed air the deposition of powder particles on the high voltage electrodes 38 prevented.
  • all parts are preferably made of electrical insulating material, with the exception of the high voltage electrodes, the High voltage generator 28, the compressed air source 14 and the control device 16th
  • the compressed air outlet 18 preferably extends radially into the powder channel 4. According to another embodiment, it can also be counter to or in the direction of flow the powder flow 18 may be inclined.
  • the compressed air outlet 8 is shaped in this way, and the compressed air is with it Amount and pressure supplied that the powder edge layer of the inner wall of the powder channel 4 lifts the powder flow to the radial Flow center crowded together and swirled.
  • the compressed air outlet 8 is so close to the downstream end 6 of the powder channel 4 that the Powder homogeneity, which is produced by the swirling, until the beginning of the Powder spraying stops at the powder channel end 8.
  • Compressed air outlet 8 or, according to embodiments not shown, several Compressed air outlets 8 are arranged axially one behind the other in the powder flow direction 18 his.
  • the Compressed air outlet in an area of the powder channel 4 where there are no internals has, so that the compressed air across the entire cross section of the powder channel 4 can flow through, as shown for example in Figures 2 to 4.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
EP02012881A 2001-08-08 2002-06-11 Dispositif de pulvérisation de poudre Withdrawn EP1283074A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10138917A DE10138917A1 (de) 2001-08-08 2001-08-08 Pulversprühbeschichtungsvorrichtung
DE10138917 2001-08-08

Publications (2)

Publication Number Publication Date
EP1283074A2 true EP1283074A2 (fr) 2003-02-12
EP1283074A3 EP1283074A3 (fr) 2005-06-15

Family

ID=7694781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02012881A Withdrawn EP1283074A3 (fr) 2001-08-08 2002-06-11 Dispositif de pulvérisation de poudre

Country Status (5)

Country Link
US (1) US6951309B2 (fr)
EP (1) EP1283074A3 (fr)
JP (1) JP2003053218A (fr)
CA (1) CA2397046A1 (fr)
DE (1) DE10138917A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007033985A1 (fr) * 2005-09-21 2007-03-29 Ramseier Technologies Ag Applicateur electrostatique
WO2010125282A1 (fr) * 2009-04-29 2010-11-04 Arkema France Dispositif et procede de pulverisation

Families Citing this family (17)

* 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
CA2534254A1 (fr) * 2003-08-18 2005-03-03 Nordson Corporation Pulverisateur pour materiau particulaire
US20050158187A1 (en) * 2003-11-24 2005-07-21 Nordson Corporation Dense phase pump for dry particulate material
ITBG20050034A1 (it) * 2005-06-03 2006-12-04 Trasmetal Spa Dispositivo elettrostatico di verniciatura.
DE102007041551A1 (de) 2007-08-31 2009-03-05 Itw Gema Gmbh Pulversprühbeschichtungsvorrichtung und Beschichtungspulver-Fördervorrichtung dafür
US8590817B2 (en) * 2008-03-10 2013-11-26 Illinois Tool Works Inc. Sealed electrical source for air-powered electrostatic atomizing and dispensing device
US8016213B2 (en) * 2008-03-10 2011-09-13 Illinois Tool Works Inc. Controlling temperature in air-powered electrostatically aided coating material atomizer
US8770496B2 (en) * 2008-03-10 2014-07-08 Finishing Brands Holdings Inc. Circuit for displaying the relative voltage at the output electrode of an electrostatically aided coating material atomizer
US8496194B2 (en) 2008-03-10 2013-07-30 Finishing Brands Holdings Inc. Method and apparatus for retaining highly torqued fittings in molded resin or polymer housing
US7926748B2 (en) * 2008-03-10 2011-04-19 Illinois Tool Works Inc. Generator for air-powered electrostatically aided coating dispensing device
US7988075B2 (en) 2008-03-10 2011-08-02 Illinois Tool Works Inc. Circuit board configuration for air-powered electrostatically aided coating material atomizer
USD608858S1 (en) 2008-03-10 2010-01-26 Illinois Tool Works Inc. Coating material dispensing device
US7918409B2 (en) * 2008-04-09 2011-04-05 Illinois Tool Works Inc. Multiple charging electrode
US8225968B2 (en) 2009-05-12 2012-07-24 Illinois Tool Works Inc. Seal system for gear pumps
EP2650051B1 (fr) * 2012-04-10 2019-04-03 Wagner International AG Insert à clavette pour rallonge de tuyau de poudre d'un pistolet de pulvérisation de poudre fonctionnant sous haute tension et rallonge de tuyau de poudre avec insert à clavette
US9950332B2 (en) 2015-04-15 2018-04-24 Joe C. McQueen Apparatus and method for rotating cylindrical members and coating internal surface of tubulars
CN114134497B (zh) * 2021-11-30 2024-01-26 中冶京诚工程技术有限公司 一种用于喷涂粉末的喷嘴及喷涂装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289278A (en) 1978-09-01 1981-09-15 Onoda Cement Co., Ltd. Powder electro-charging device and electrostatic powder painting device
DE19542863A1 (de) 1995-11-17 1997-05-22 Abb Research Ltd Pulversprüheinrichtung

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JPS5145143A (en) * 1974-10-16 1976-04-17 Ransburg Japan Ltd Funshapataanno choseiga kanona funtaitosoyofunshanozuru
DE2722100C2 (de) * 1977-05-16 1983-12-15 Hajtómüvek és Festöberendezések Gyára, Budapest Vorrichtung zum elektrostatischen Auftragen bzw. Aufsprühen von Materialteilchen
SE438966B (sv) * 1978-12-04 1985-05-28 Gema Ransburg Ag Sprutanordning for pulver, med i munstycksoppningen tangentiellt inledd spridningsgas
DE3014133C2 (de) * 1980-04-12 1984-04-19 Ransburg-Gema AG, 9015 St.Gallen Vorrichtung zum Zerstäuben von Pulver
DE3608426C3 (de) 1986-03-13 1994-11-24 Gema Volstatic Ag Elektrostatische Sprüheinrichtung für Beschichtungspulver
US4772982A (en) * 1986-11-13 1988-09-20 Hideo Nagasaka Powder charging apparatus and electrostatic powder coating apparatus
US5711489A (en) * 1994-08-18 1998-01-27 Nihon Parkerizing Co., Ltd. Electrostatic powder coating method and apparatus
DE19502522A1 (de) 1995-01-27 1996-08-01 Gema Volstatic Ag Sprühvorrichtung für Beschichtungsmaterial
DE19537089A1 (de) 1995-10-05 1997-04-10 Abb Research Ltd Verfahren und Einrichtung zum Pulversprühen
JPH09192586A (ja) * 1996-01-17 1997-07-29 Nippon Parkerizing Co Ltd 静電粉体塗装方法
DE19606214B4 (de) 1996-02-20 2006-06-01 Abb Research Ltd. Verfahren und Einrichtung zur Steuerung des Austritts eines fluidisierten Feststoffs aus einem Behälter
DE19614192A1 (de) 1996-04-10 1997-10-16 Abb Research Ltd Dispergiersystem für eine Pulversprüheinrichtung
US6053420A (en) 1996-04-10 2000-04-25 Abb Research Ltd. Dispersion apparatus and process for producing a large cloud of an electrostatically charged powder/air mixture

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289278A (en) 1978-09-01 1981-09-15 Onoda Cement Co., Ltd. Powder electro-charging device and electrostatic powder painting device
DE19542863A1 (de) 1995-11-17 1997-05-22 Abb Research Ltd Pulversprüheinrichtung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007033985A1 (fr) * 2005-09-21 2007-03-29 Ramseier Technologies Ag Applicateur electrostatique
WO2010125282A1 (fr) * 2009-04-29 2010-11-04 Arkema France Dispositif et procede de pulverisation
FR2944980A1 (fr) * 2009-04-29 2010-11-05 Arkema France Dispositif et procede de pulverisation

Also Published As

Publication number Publication date
CA2397046A1 (fr) 2003-02-08
DE10138917A1 (de) 2003-03-06
US6951309B2 (en) 2005-10-04
US20030042341A1 (en) 2003-03-06
JP2003053218A (ja) 2003-02-25
EP1283074A3 (fr) 2005-06-15

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