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EP0238031A2 - Dispositif de revêtement électrostatique d'objets - Google Patents

Dispositif de revêtement électrostatique d'objets Download PDF

Info

Publication number
EP0238031A2
EP0238031A2 EP87103818A EP87103818A EP0238031A2 EP 0238031 A2 EP0238031 A2 EP 0238031A2 EP 87103818 A EP87103818 A EP 87103818A EP 87103818 A EP87103818 A EP 87103818A EP 0238031 A2 EP0238031 A2 EP 0238031A2
Authority
EP
European Patent Office
Prior art keywords
electrodes
charging electrodes
spray head
face
charging
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
EP87103818A
Other languages
German (de)
English (en)
Other versions
EP0238031B1 (fr
EP0238031A3 (en
Inventor
Hans Behr
Kurt Vetter
Rolf Schneider
Fred Luderer
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.)
Mahle Behr Industry GmbH and Co KG
Original Assignee
Behr Industrieanlagen GmbH and Co KG
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 Behr Industrieanlagen GmbH and Co KG filed Critical Behr Industrieanlagen GmbH and Co KG
Publication of EP0238031A2 publication Critical patent/EP0238031A2/fr
Publication of EP0238031A3 publication Critical patent/EP0238031A3/de
Application granted granted Critical
Publication of EP0238031B1 publication Critical patent/EP0238031B1/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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0426—Means for supplying shaping gas
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • 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 device according to the preamble of claim 1.
  • Such a device for example for coating vehicle body shells, in which, in contrast to conventional systems, instead of the spray head, only one arrangement of external electrodes is placed at high voltage potential, is known to have significant advantages when using highly conductive spray materials, such as so-called water-based paints (see DE-OS 34 29 075). In particular, significant insulation problems are avoided since the entire paint line system can be grounded up to the spray head.
  • the device known from DE-OS 34 29 075 should only have two, three or at most four charging electrodes, each in embedded a plastic holder protruding radially from the outer housing of the spray head and projecting axially in the direction of the object to be coated.
  • Each of these holders contains a high-voltage cable leading to its respective electrode and is firmly connected at the rear end to a ring body which is also made of plastic and is placed on the outer housing.
  • the invention has for its object to provide a coating device with external electrodes, which avoids contamination of the spraying device and the electrode holder arrangement as far as possible with good application efficiency.
  • a uniform spray pattern should preferably be ensured for the object to be coated.
  • the invention is based on the surprising finding that the problems resulting from the use of highly conductive coating materials (as described in the aforementioned DE-OS 34 29 075) also result from the distribution of a relatively large number of charging electrodes Have the spray head detached if there is sufficient mutual insulation between the electrode tips on the outside of the electrode holder. The insulation would be reduced by a substantial precipitation of the conductive coating material on the end face of the ring body forming the electrode holder, which would result in a sudden drop in the field strength at the electrode tips and thus a further increase in contamination.
  • the device shown contains a spray device in the form of a rotary atomizer 1 of the known bell type, the bell plate 2 forming the spray head of which can preferably be driven by an air turbine at high speed.
  • a line (not shown) that feeds the paint or other coating material from a supply system to the bell cup 2 runs along the axis of the spray device. With this line, which is formed, for example, by an earthed metal tube, the entire conductive coating material, such as water-based paint or the like, is at earth potential up to the spraying edge 6 of the bell cup 2.
  • the object to be coated (not shown), such as, for example, a part of a vehicle body, which is arranged at an axial distance in front of the bell plate 2, is also at earth potential.
  • the spray device can have an outer housing 7 made of an insulating plastic.
  • needle-shaped charging electrodes 10 are provided in the example shown on a circle concentric to the axis of the spraying device with a diameter of about 400 mm at uniform angular intervals.
  • the charging electrodes 10 are embedded axially parallel with their central main part in a circular ring body 20 made of insulating material, as can be seen in FIG. 1.
  • the front end (tip) of the electrodes is exposed in a depression 22 in the end face 21 of the ring body 20 facing the object to be coated.
  • the depression 22 opens outward at an angle which is more than 90 ° (for example about 120 °) should be, which among other things any necessary cleaning of the electrode tips is facilitated.
  • the rear ends of the charging electrodes 10 are connected in an electrically conductive manner to a conductor 12 made of wire or wire mesh, which interconnects all electrodes in a ring shape and which is to be completely enclosed in the interior of the ring body 20 for electrical insulation.
  • the ring body 20 is fastened by two spokes 24, which are also made of insulating material and which protrude radially from an insulating material ring 26 placed on the outer housing 7, but preferably obliquely inclined in the direction of the object to be coated. Different shaped and arranged spokes can also be provided.
  • the ring body 20, the spokes 24 and the ring 26 can be formed in one piece or connected to one another.
  • a clamping screw 29 can be used for fastening to the outer housing 7.
  • a high-voltage cable 14 leads through an outer connecting part 28, the ring 26 and one of the tubular spokes 24 and is connected to the conductor 12 connecting the charging electrodes 10 via a contact arrangement 16 provided at the (in FIG. 1 upper) end of the memory 24.
  • the high voltage potential thus applied to the electrodes can be, for example, 60 to 80 kV or more.
  • the contact arrangement 16 can e.g. contain a compression spring 17 and a screwed against the conductor 12 contact pin 18.
  • An advantage of the device described here is therefore that only a single high-voltage cable is required for the electrical connection of the outer electrodes, while in the known device with electrodes located in their own holders, each of them has a separate cable which leads outside the holder to the each other cables must be coupled together at a connection point.
  • the number of charging electrodes 10 is of course not limited to the example chosen here, but should be chosen so that there is a sufficiently small distance between the electrodes to avoid a risk of contamination from the coating material on the front end face of the ring body 20. With a pitch circle diameter of the electrodes of 400 mm, between about 18 and 30 electrodes should be used. With significantly fewer charging electrodes, one would find a substantial coating of the end face 21, that is to say conductively connecting the electrodes outside of the insulating ring body 20, with the sequence explained at the beginning of an increase in further contamination of the coating device, while more than 30 electrodes in this example without noteworthy further improvement of the electric field would only increase the structural effort.
  • the distance between the electrode tips should accordingly be between approximately 40 and 70 mm.
  • the radially measured distance of the electrode tips from the spray edge 6, as in the known device, should be greater than twice the diameter (here approximately 70 mm) of the spray edge.
  • a currently preferred range of possible pitch circle diameters of the electrodes 10 is approximately 350 to 450 mm.
  • the axial position of the electrode tips with respect to the plane of the spraying edge 6 is also important for the risk of contamination.
  • the electrode tips are to be set back a certain distance behind the spraying edge 6 in the axial direction. This distance is chosen so that there is a usable compromise between the charging of the sprayed coating material, which improves with decreasing distance, and, at the same time, increasing pollution, particularly of the bell cup 2 and the atomizer or its housing.
  • axially measured distances between 25 and 60 mm and preferably about 50 mm have proven to be useful.
  • the front ends of the charging electrodes should be set back axially by less than 1/3 of the distance of the electrode tips from the spraying edge 6 measured in the radial direction behind the plane of the spraying edge.
  • an electrically conductive connection between the charging electrodes outside the ring body 20 which forms their holder is to be avoided by coating with conductive material (water-based paint).
  • conductive material water-based paint
  • a first additional measure is to increase the "leakage current" or surface path between the electrode tips.
  • These pins 31 can be used with their rear ends in the ring body 20 Ring or molded.
  • the electrodes 10 ⁇ are exposed with their front end in a depression similar to the depression 22 in the front pin end, while at the rear end they are connected to a connecting conductor 12 ⁇ as in the exemplary embodiment according to FIG. 1.
  • FIGS. 4 and 5 Another additional measure consists, according to FIGS. 4 and 5, in the interior of the annular body 20 ⁇ in addition to the connecting conductor to form an annular fluid channel 35 under fluid pressure, from which axially opening fluid openings 36 to the outside towards the end face 21 ⁇ Guide ring body 20 ⁇ between the charging electrodes 10 ⁇ .
  • the fluid, preferably air, flowing out of the openings 36 keeps the coating material away from the end face.
  • the connection of the fluid channel 35 to an external compressed air or other fluid source indicated by arrow 37 in FIG. 1 can lead through one of the spokes 24, expediently through the one in which the high-voltage cable 14 is not located.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP87103818A 1986-03-19 1987-03-17 Dispositif de revêtement électrostatique d'objets Expired - Lifetime EP0238031B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3609240A DE3609240C2 (de) 1986-03-19 1986-03-19 Vorrichtung zum elektrostatischen Beschichten von Gegenständen
DE3609240 1986-03-19

Publications (3)

Publication Number Publication Date
EP0238031A2 true EP0238031A2 (fr) 1987-09-23
EP0238031A3 EP0238031A3 (en) 1988-09-14
EP0238031B1 EP0238031B1 (fr) 1990-10-03

Family

ID=6296766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87103818A Expired - Lifetime EP0238031B1 (fr) 1986-03-19 1987-03-17 Dispositif de revêtement électrostatique d'objets

Country Status (9)

Country Link
US (2) US4852810A (fr)
EP (1) EP0238031B1 (fr)
JP (1) JPH0755299B2 (fr)
CA (1) CA1282951C (fr)
DD (1) DD255482A5 (fr)
DE (2) DE3609240C2 (fr)
ES (1) ES2017947B3 (fr)
FI (1) FI84027C (fr)
HU (1) HU194507B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3720201C1 (de) * 1987-06-16 1988-09-08 Ransburg Gmbh Spruehbeschichtungseinrichtung mit einer ringfoermigen Elektrodenanordnung fuer elektrisch leitfaehige Beschichtungsfluessigkeiten
DE3919653A1 (de) * 1989-06-16 1990-12-20 Alfo Ag Elektrostatische spritzpistole
EP0509101A4 (en) * 1990-05-18 1992-12-02 Ransburg Automotive Kk Electrostatic coating device
WO2008079922A3 (fr) * 2006-12-21 2008-09-25 Itw Ltd Appareil de pulvérisation de peinture

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DE3863562D1 (de) * 1987-03-23 1991-08-14 Behr Industrieanlagen Vorrichtung zum elektrostatischen beschichten von werkstuecken.
DE3709510A1 (de) * 1987-03-23 1988-10-06 Behr Industrieanlagen Verfahren zur betriebssteuerung einer elektrostatischen beschichtungsanlage
JPH0751167Y2 (ja) * 1989-11-30 1995-11-22 トリニティ工業株式会社 静電塗装用放電極
US4989793A (en) * 1990-02-02 1991-02-05 Illinois Tool Works, Inc. Indirect charging electrode for electrostatic spray guns
US5039019A (en) * 1990-08-01 1991-08-13 Illinois Tool Works, Inc. Indirect charging electrostatic coating apparatus
US5154358A (en) * 1991-03-05 1992-10-13 Nordson Corporation Repulsion device for low capacitance electrostatic painting systems
FR2692501B1 (fr) * 1992-06-22 1995-08-04 Sames Sa Dispositif de projection electrostatique de produit de revetement liquide a tete de pulverisation rotative.
US5474236A (en) * 1992-12-03 1995-12-12 Nordson Corporation Transfer of electrostatic charge to a rotary atomizer head through the housing of a rotary atomizing spray device
US5843536A (en) * 1992-12-03 1998-12-01 Ransburg Corporation Coating material dispensing and charging system
DE4312262A1 (de) * 1993-04-15 1994-10-20 Gema Volstatic Ag Elektrostatische Sprühvorrichtung
DE19528398A1 (de) * 1995-08-02 1997-02-06 Gema Volstatic Ag Elektrostatische Sprühvorrichtung für Beschichtungsmaterial
US5850976A (en) * 1997-10-23 1998-12-22 The Eastwood Company Powder coating application gun and method for using the same
CA2322256C (fr) * 1998-03-04 2006-09-05 Abb Patent Gmbh Pulverisateur rotatif a sources haute tension
CA2346240A1 (fr) 1998-10-14 2000-04-20 Delsys Pharmaceutical Corporation Support electrostatique capteur utilisant des electrodes a zones appariees
JP2001046926A (ja) * 1999-08-06 2001-02-20 Kansai Paint Co Ltd 回転ベル型静電塗装装置
DE10115470A1 (de) * 2001-03-29 2002-10-10 Duerr Systems Gmbh Beschichtungsanlage mit einer Zerstäuberwechselstation
DE10115463A1 (de) * 2001-03-29 2002-10-02 Duerr Systems Gmbh Zerstäuber für eine Beschichtungsanlage und Verfahren zu seiner Materialversorgung
DE10115472A1 (de) * 2001-03-29 2002-10-10 Duerr Systems Gmbh Ventileinheit für eine elektrostatische Beschichtungsanlage
DE10115467A1 (de) * 2001-03-29 2002-10-02 Duerr Systems Gmbh Werkzeugwechselsystem für eine Maschine
US6708908B2 (en) 2001-06-29 2004-03-23 Behr Systems, Inc. Paint atomizer bell with ionization ring
DE10139088A1 (de) * 2001-08-16 2003-02-27 Duerr Systems Gmbh Manipulatormaschine mit einer zu dem Arbeitsgerät geführten Leitungsanordnung
DE10202711A1 (de) 2002-01-24 2003-07-31 Duerr Systems Gmbh Zerstäuber für die elektrostatische Serienbeschichtung von Werkstücken
DE10301942A1 (de) * 2003-01-20 2004-07-29 Dürr Systems GmbH Hydraulisch dynamischer Monomolch
DE10231421A1 (de) 2002-07-11 2004-01-22 Dürr Systems GmbH Verfahren und System zur Versorgung eines Pulverbeschichtungsgerätes
DE10233197A1 (de) * 2002-07-22 2004-02-05 Dürr Systems GmbH Potentialausgleichsanordnung für einen elektrostatischen Rotationszerstäuber
DE10233198A1 (de) * 2002-07-22 2004-02-05 Dürr Systems GmbH Rotationszerstäuber
DE10233199A1 (de) * 2002-07-22 2004-02-05 Dürr Systems GmbH Turbinenmotor eines Rotationszerstäubers
DE10239516A1 (de) * 2002-08-28 2004-03-18 Dürr Systems GmbH Schlauch für die elektrostatische Beschichtung von Werkstücken
DE10239517A1 (de) * 2002-08-28 2004-03-11 Dürr Systems GmbH Beschichtungseinrichtung mit einem Rotationszerstäuber und Verfahren zum Steuern ihres Betriebes
DE10240072B4 (de) * 2002-08-30 2005-11-24 Dürr Systems GmbH Molch zur Förderung eines Beschichtungsmaterials und Verfahren zu seiner Herstellung
DE10240451A1 (de) * 2002-09-02 2004-03-11 Dürr Systems GmbH Sensoranordnung für eine Beschichtungsanlage
DE10245594A1 (de) 2002-09-30 2004-04-08 Dürr Systems GmbH Verfahren zur Kollisionserkennung
US20050002742A1 (en) * 2002-12-11 2005-01-06 Martin Bachmann Method and device for transporting powdery substances
US6991178B2 (en) 2003-01-24 2006-01-31 Dürr Systems, Inc. Concentric paint atomizer shaping air rings
US7610765B2 (en) 2004-12-27 2009-11-03 Carrier Corporation Refrigerant charge status indication method and device
EP1911523B1 (fr) * 2005-08-01 2010-07-07 Abb K.K. Dispositif de revetement electrostatique
US7455249B2 (en) 2006-03-28 2008-11-25 Illinois Tool Works Inc. Combined direct and indirect charging system for electrostatically-aided coating system
US20080011333A1 (en) * 2006-07-13 2008-01-17 Rodgers Michael C Cleaning coating dispensers
US7520450B2 (en) * 2006-10-10 2009-04-21 Illinois Tool Works Inc. Electrical connections for coating material dispensing equipment
US8671495B2 (en) * 2006-11-06 2014-03-18 Durr Systems, Inc. Scraper pig
US20090020626A1 (en) * 2007-07-16 2009-01-22 Illinois Tool Works Inc. Shaping air and bell cup combination
US8096264B2 (en) * 2007-11-30 2012-01-17 Illinois Tool Works Inc. Repulsion ring
DE502007002126D1 (de) * 2007-12-10 2010-01-07 Mtronix Prec Measuring Instr G Vorrichtung und Verfahren zur Erzeugung eines definierten Ladungspulses zur Ausführung einer Teilentladungsmessung
DE102009013979A1 (de) * 2009-03-19 2010-09-23 Dürr Systems GmbH Elektrodenanordnung für einen elektrostatischen Zerstäuber
US20150060579A1 (en) * 2013-08-29 2015-03-05 Finishing Brands Holdings Inc. Electrostatic Spray System
JP6835356B2 (ja) * 2017-03-30 2021-02-24 有光工業株式会社 静電散布ノズル及び静電散布装置
US12350698B2 (en) * 2019-01-25 2025-07-08 Spraying Systems Co. Induction device for electrostatic spray nozzle assembly

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3720201C1 (de) * 1987-06-16 1988-09-08 Ransburg Gmbh Spruehbeschichtungseinrichtung mit einer ringfoermigen Elektrodenanordnung fuer elektrisch leitfaehige Beschichtungsfluessigkeiten
DE3919653A1 (de) * 1989-06-16 1990-12-20 Alfo Ag Elektrostatische spritzpistole
EP0509101A4 (en) * 1990-05-18 1992-12-02 Ransburg Automotive Kk Electrostatic coating device
WO2008079922A3 (fr) * 2006-12-21 2008-09-25 Itw Ltd Appareil de pulvérisation de peinture
US8104423B2 (en) 2006-12-21 2012-01-31 Illinois Tool Works Inc. Coating material dispensing apparatus and method

Also Published As

Publication number Publication date
ES2017947B3 (es) 1991-03-16
DE3609240A1 (de) 1987-09-24
JPS62277171A (ja) 1987-12-02
CA1282951C (fr) 1991-04-16
EP0238031B1 (fr) 1990-10-03
HUT43277A (en) 1987-10-28
DD255482A5 (de) 1988-04-06
JPH0755299B2 (ja) 1995-06-14
DE3609240C2 (de) 1996-08-01
FI84027C (fi) 1991-10-10
HU194507B (en) 1988-02-29
FI871205L (fi) 1987-09-20
US4872616A (en) 1989-10-10
FI871205A0 (fi) 1987-03-19
DE3765274D1 (de) 1990-11-08
FI84027B (fi) 1991-06-28
US4852810A (en) 1989-08-01
EP0238031A3 (en) 1988-09-14

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