EP0212122A1 - Appareil de pulvérisation pour l'application électrostatique de poudre - Google Patents

Appareil de pulvérisation pour l'application électrostatique de poudre Download PDF

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Publication number
EP0212122A1
EP0212122A1 EP86108211A EP86108211A EP0212122A1 EP 0212122 A1 EP0212122 A1 EP 0212122A1 EP 86108211 A EP86108211 A EP 86108211A EP 86108211 A EP86108211 A EP 86108211A EP 0212122 A1 EP0212122 A1 EP 0212122A1
Authority
EP
European Patent Office
Prior art keywords
powder
channel
flow guide
electrode
guide body
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
EP86108211A
Other languages
German (de)
English (en)
Other versions
EP0212122B1 (fr
Inventor
Radovan Talacko
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 EP0212122A1 publication Critical patent/EP0212122A1/fr
Application granted granted Critical
Publication of EP0212122B1 publication Critical patent/EP0212122B1/fr
Expired 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
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging

Definitions

  • the invention relates to a spray device for electrostatic powder coating, with a main device, which has a discharge channel for powder, a mouth at the downstream end of the discharge channel for atomizing the powder, a powder feed line for supplying pneumatically conveyed powder into the upstream initial section of the discharge channel, and a gas feed line , through which gas is conducted into the discharge channel along a discharge electrode that can be connected to earth potential.
  • Such a spray device is known from DE-PS 23 47 491.
  • the wall of the delivery channel consists of electrically insulating material through which powder particles rubbing along it are electrically charged. This creates an accumulation of electrical charges on the channel wall, which hinder the electrical charging of the powder particles.
  • the Discharge electrode protrudes into the powder gas flow in the discharge channel and serves to discharge the accumulated charge from the channel wall via the discharge electrode to an earth connection. The gas in the gas supply line flows over the discharge electrode so that no powder particles can adhere to it.
  • a similar device is shown in DE-PS 22 03 351.
  • DD-PS 134 841 shows a similar spraying device in which a flow guide made of electrically insulating material is arranged in the discharge channel, so that the powder adheres to both the channel wall and the Can electrically charge the surface of the flow guide body by friction.
  • DE-OS 27 56 009 (US Pat. No. 4,090,666) shows a spray device without a discharge electrode, in which gas is introduced coaxially to the powder-gas flow of the pneumatically conveyed powder into the discharge channel via a gas feed line in order to mix the powder particles with the To drive the gas of the gas supply line radially outward against the channel wall so that more powder particles rub along the channel wall and the powder as a whole is more strongly charged due to greater friction pressure.
  • the aim of the invention is to achieve the object of designing the spray device in such a way that the powder can optionally be electrostatically charged using various processes, and the device can be changed from one process to another by simple manipulation.
  • the changeover should be able to be carried out quickly and the spraying device should be structurally simple and inexpensive.
  • the main device forms a variable set of devices together with at least two alternative devices which can be used alternatively, each of which is designed for a different method for electrically charging the powder
  • the main device has a Connector for connecting one of the additional devices
  • each additional device has a flow guide body, which has a connector for connection to the connector of the main unit and extends axially through the delivery channel in the fastened state, so that the latter has an annular cross section with an outer channel wall and with An inner channel wall formed by the flow guide body has that the flow guide body of one of the additional devices has an electrically insulating material at least on its outer surface forming the inner channel wall for electrokinetic charging of the powder by friction of the powder on this material, and that a high-voltage generator circuit is accommodated in the flow guide body of at least one other of the additional devices and that this flow guide body has at least one electrode connected to this high-voltage generator circuit for electrostatic charging of the powder.
  • one of the additional devices can alternatively be inserted into the main device in a simple manner, and the main device can thereby be optionally switched to different electrostatic spray coating processes.
  • the main device 2 of the spraying device has a gun housing 4 made of electrically insulating material and a discharge electrode 6 made of electrically conductive material.
  • the conductor electrode 6 is connected to this gun body in a channel part 8 of a delivery channel 10, which is formed in the gun body 4.
  • An end section 12 of the arrester electrode 6 protruding from the gun body at the rear is connected to a ground potential connection 16 via a screwed-on nut 14.
  • Another part 18 of the discharge channel 10 is designed as an annular groove and forms an annular space 20 surrounding the conductor electrode 6.
  • a gas feed line 22 leads through the gun body 4 into the annular space 20.
  • the annular space 20 is connected to a channel part 26 of the discharge channel 10 via a flow restrictor 24 connected, which extends from the mouth 28 of a powder feed line 30 formed in the gun body 4 to a mouth 32 at the downstream end of the discharge channel 10.
  • the flow restrictor 24 has the shape of an annular gap which is formed on the outside by a wall part 34 of the discharge channel 10 and on the inside over part of its length by a downstream end section 38 of the discharge electrode 6.
  • the end section 38 of the arrester electrode 6 is designed as a connector for an additional device and is provided with an internal thread 40 for this purpose.
  • the inner wall of the annular gap forming the flow restrictor 24 is formed at the downstream end section 42, following the arrester electrode 6, by a part of the additional device which is screwed into the internal thread 40.
  • the channel part 26 of the discharge channel 10 through which the powder flows has
  • a channel wall 44 made of electrically insulating material which electrically charges powder particles rubbing against it due to the friction.
  • an additional device 50 which has a flow guide body 52 with a connecting piece 54.
  • the connecting piece 54 is provided with an external thread 56, which is screwed into the internal thread 40 of the discharge electrode 6 and holds the flow guide body 52 axially in the channel part 26 of the discharge channel 10.
  • the flow guide body 52 consists of an electrically insulating material which electrically charges powder particles rubbing against it by friction.
  • the jacket wall 58 forms an inner channel wall, so that the channel part 26 of the discharge channel between the inner channel wall 58 and the outer channel wall 44 has an annular cross section.
  • the flow guide 52 has an upstream of the mouth 32 a tapered body section in the flow direction, through which the annular space of the channel part 26 increases in the flow direction, so that a diffuser-like atomization of the powder takes place along the body section 60 before it leaves the mouth 32 and by impact is atomized further onto a baffle plate 62.
  • the baffle plate 62 is part of the flow guide body 52.
  • the powder particles in the channel part 26 are electrostatically charged by friction both from the outer channel wall 44 and from the inner channel wall 58.
  • the powder is fed pneumatically via the feed line 30, so that the powder stream already enters the powder in the feed line 30 contains transporting gas.
  • a bore 64 leads axially through the conductor electrode 6 and is necessary for connecting the variants of additional devices described below with reference to FIGS. 2, 3 and 4.
  • the other variants each have the same main device 2, but different additional devices. In the following, only those parts are described which differ from variant 1 according to FIG. 1.
  • FIG. 2 shows an additional device 70 with a flow guide body 72, in which a high-voltage generator circuit 74 is accommodated.
  • the high-voltage generator circuit 74 is provided on its low-voltage side 76 with a power supply cable 78 which is passed through the bore 64 of the arrester electrode 6.
  • the high voltage side 80 of the high voltage generator circuit 74 is connected to electrodes 82 which protrude upstream of the tapered body section 60 into the channel part 26 and electrostatically charge flowing powder. This is referred to as “internal charging” because the powder is charged along the body section 60 before it expands.
  • the flow guide body 72 and the baffle plate 62 consist of a
  • the powder is also electrically charged by friction on the inner channel wall 58 and the outer channel wall 44 by friction.
  • Variant 3 shown in FIG. 3 shows an additional device 90 similar to variant 2 of FIG. 2, but with variant 3 electrodes 91 of a flow guide body 92 are arranged in a region 93 upstream of the mouth 32, where the powder passes through the tapered body section 60 of the flow guide 92 has already been partially atomized. As a result, we speak of "external charging".
  • the electrodes 91 are connected via an electrical protective resistor 94 to the high-voltage side 80 of a high-voltage generator circuit 74, which is enclosed in the plastic flow guide 92.
  • the fourth variant shown in FIG. 4 shows an additional device 100, in which an electrode 101 protrudes from the front end of the baffle plate 62.
  • the electrode 101 is connected via an electrical protective resistor 94 to the high-voltage side 80 of a high-voltage generator circuit 74, which are cast into the flow guide body 102.
  • the flow guide body 102 consists of an electrically insulating plastic material which electrically charges powder particles rubbing against it by friction.
  • the electrical protective resistor 94 is also included in the flow guide 32 of FIG. 3 and 102 of FIG. 4.
  • the powder is electrostatically charged only by friction.
  • an additional electrostatic charge takes place through the electrodes 82, 91, 101.
  • the additional device 50, 70, 90 and 100 each mainly consists of a flow guide body in which all parts or materials required for the electrostatic charging of the powder are integrated.
  • the additional devices can be replaced quickly, since only a different flow guide body has to be screwed into the main device.
  • only a single main device 2 with a single connecting piece 38 is required, which is part of the main device 2 and preferably simultaneously forms the conductor electrode 6.
  • the channel part 8 of the delivery channel 10 is designed as a connecting piece for the additional device and has, for example, an internal thread for this purpose.
  • the arrester electrode 6 would be part of the additional device 50 from FIG. 1, and the arrester electrode could be permanently connected to the flow conductor body 52.
  • the additional devices 70, 90 and 100 of FIGS. 2, 3 and 4 would have a connector corresponding to the shape of the discharge electrode 6, which is connected to the flow guide body 72, 92, 102 and can be releasably inserted into part 8 together with the latter can, preferably can be screwed.
  • the additional devices 70, 90 and 100 of FIGS. 2, 3 and 4 a good function is also provided if the powder is not charged electrically by friction, but only by the electrodes 82, 91, 101. No arrester electrode 6 is required for these applications. It is sufficient for the additional devices 70, 90 and 100 a connector 38. This can have the overall shape of the conductor electrode 6, and consist of electrically non-conductive or conductive material.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP86108211A 1985-08-20 1986-06-16 Appareil de pulvérisation pour l'application électrostatique de poudre Expired EP0212122B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3529703 1985-08-20
DE3529703A DE3529703C1 (de) 1985-08-20 1985-08-20 Spruehvorrichtung zur elektrostatischen Pulverbeschichtung

Publications (2)

Publication Number Publication Date
EP0212122A1 true EP0212122A1 (fr) 1987-03-04
EP0212122B1 EP0212122B1 (fr) 1988-10-26

Family

ID=6278887

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86108211A Expired EP0212122B1 (fr) 1985-08-20 1986-06-16 Appareil de pulvérisation pour l'application électrostatique de poudre

Country Status (5)

Country Link
US (1) US4747546A (fr)
EP (1) EP0212122B1 (fr)
JP (1) JPS6316066A (fr)
DE (1) DE3529703C1 (fr)
ES (1) ES8707677A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987004088A1 (fr) * 1986-01-14 1987-07-16 Esb Elektrostatische Sprüh- Und Beschichtungsanlag Dispositif electrostatique de pulverisation a chargement tribo-electrique de la poudre

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DE3601081A1 (de) * 1986-01-16 1987-07-23 Kopperschmidt Mueller & Co Elektrostatische spruehpistole, insbesondere fuer pulver
SE460643B (sv) * 1987-04-28 1989-11-06 Ac Greiff Ytbehandling Ab Anordning vid pulverspruta med en laangstraeckt ringformig uppladdningskanal
DE4141663C2 (de) * 1991-12-17 1996-09-19 Wagner Int Elektrostatische Pulver-Beschichtungspistole
DE4203989A1 (de) * 1992-02-12 1993-08-19 Intec Maschinenbau Gmbh Elektrostatische spruehpistole
US5344082A (en) * 1992-10-05 1994-09-06 Nordson Corporation Tribo-electric powder spray gun
US5341989A (en) * 1993-02-16 1994-08-30 Nordson Corporation Electrostatic powder spray gun with hose purge adaptor
DE29500914U1 (de) * 1995-01-21 1995-03-09 Ophardt Technik KG, 47661 Issum Vorrichtung zum triboelektrischen Aufladen von pulverförmigen Stoffen
US5622313A (en) * 1995-03-03 1997-04-22 Nordson Corporation Triboelectric powder spray gun with internal discharge electrode and method of powder coating
DE19537089A1 (de) * 1995-10-05 1997-04-10 Abb Research Ltd Verfahren und Einrichtung zum Pulversprühen
US5721052A (en) * 1996-05-06 1998-02-24 Morton International, Inc. Textured epoxy powder coating compositions for wood substrates and method of coating wood therewith
US5850976A (en) * 1997-10-23 1998-12-22 The Eastwood Company Powder coating application gun and method for using the same
US6417255B1 (en) 1999-12-15 2002-07-09 General Electric Company High performance thermoplastic compositions with improved melt flow behavior
US20040011901A1 (en) * 2000-07-10 2004-01-22 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
US20030038193A1 (en) * 2000-07-11 2003-02-27 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
US6467705B2 (en) 2001-01-29 2002-10-22 The Easthill Group, Inc. Tribo-corona powder application gun
FR2820344B1 (fr) * 2001-02-08 2003-03-14 Eisenmann France Sarl Pulverisateur triboelectrique
US20040159282A1 (en) * 2002-05-06 2004-08-19 Sanner Michael R Unipolarity powder coating systems including improved tribocharging and corona guns
US6874712B2 (en) * 2002-09-27 2005-04-05 Abb Inc. Swirl gun for powder particles
US7240861B2 (en) * 2003-08-12 2007-07-10 The University Of Western Ontario Method and apparatus for dispensing paint powders for powder coatings
US7296760B2 (en) 2004-11-17 2007-11-20 Illinois Tool Works Inc. Indexing valve
US7296759B2 (en) * 2004-11-19 2007-11-20 Illinois Tool Works Inc. Ratcheting retaining ring
US20060202060A1 (en) * 2004-12-06 2006-09-14 Alexander Kevin L Dispensing device handle assembly
US7757973B2 (en) 2005-04-04 2010-07-20 Illinois Tool Works Inc. Hand-held coating dispensing device
US7460924B2 (en) * 2005-06-16 2008-12-02 Illinois Tool Works Inc. In-gun power supply control
US7364098B2 (en) * 2005-10-12 2008-04-29 Illinois Tool Works Inc. Material dispensing apparatus
US7621471B2 (en) * 2005-12-16 2009-11-24 Illinois Tool Works Inc. High voltage module with gas dielectric medium or vacuum
US7455249B2 (en) 2006-03-28 2008-11-25 Illinois Tool Works Inc. Combined direct and indirect charging system for electrostatically-aided coating system
US7988075B2 (en) 2008-03-10 2011-08-02 Illinois Tool Works Inc. Circuit board configuration for air-powered electrostatically aided coating material atomizer
US8016213B2 (en) 2008-03-10 2011-09-13 Illinois Tool Works Inc. Controlling temperature in air-powered electrostatically aided coating material atomizer
US8590817B2 (en) 2008-03-10 2013-11-26 Illinois Tool Works Inc. Sealed electrical source for air-powered electrostatic atomizing and dispensing device
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
USD608858S1 (en) 2008-03-10 2010-01-26 Illinois Tool Works Inc. Coating material dispensing device
US7926748B2 (en) 2008-03-10 2011-04-19 Illinois Tool Works Inc. Generator for air-powered electrostatically aided coating 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

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US4266721A (en) * 1979-09-17 1981-05-12 Ppg Industries, Inc. Spray application of coating compositions utilizing induction and corona charging means
US4417696A (en) * 1980-08-29 1983-11-29 Toyota Jidosha Kogyo Kabushiki Kaisha Triboelectrification type electrostatic paint gun for paint in a powder form

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US4417696A (en) * 1980-08-29 1983-11-29 Toyota Jidosha Kogyo Kabushiki Kaisha Triboelectrification type electrostatic paint gun for paint in a powder form

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987004088A1 (fr) * 1986-01-14 1987-07-16 Esb Elektrostatische Sprüh- Und Beschichtungsanlag Dispositif electrostatique de pulverisation a chargement tribo-electrique de la poudre

Also Published As

Publication number Publication date
ES556433A0 (es) 1987-08-16
ES8707677A1 (es) 1987-08-16
DE3529703C1 (de) 1986-08-28
US4747546A (en) 1988-05-31
JPS6316066A (ja) 1988-01-23
EP0212122B1 (fr) 1988-10-26

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