EP0034277B1 - Procédé et dispositif pour le revêtement électrostatique en poudre d'objets - Google Patents

Procédé et dispositif pour le revêtement électrostatique en poudre d'objets Download PDF

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Publication number
EP0034277B1
EP0034277B1 EP81100608A EP81100608A EP0034277B1 EP 0034277 B1 EP0034277 B1 EP 0034277B1 EP 81100608 A EP81100608 A EP 81100608A EP 81100608 A EP81100608 A EP 81100608A EP 0034277 B1 EP0034277 B1 EP 0034277B1
Authority
EP
European Patent Office
Prior art keywords
spray head
powder
air mixture
air
external rotor
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
Application number
EP81100608A
Other languages
German (de)
English (en)
Other versions
EP0034277A2 (fr
EP0034277A3 (en
Inventor
Roland Andreas Dipl.-Ing. Meisner
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.)
BASF Farben und Fasern AG
Original Assignee
BASF Farben und Fasern AG
BASF Lacke und Farben AG
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 BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Priority to AT81100608T priority Critical patent/ATE9547T1/de
Publication of EP0034277A2 publication Critical patent/EP0034277A2/fr
Publication of EP0034277A3 publication Critical patent/EP0034277A3/de
Application granted granted Critical
Publication of EP0034277B1 publication Critical patent/EP0034277B1/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
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member
    • B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0415—Driving means; Parts thereof, e.g. turbine, shaft, bearings
    • 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
    • B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material

Definitions

  • the invention relates to a method for electrostatically powder coating objects by supplying a powder-air mixture to a spray head, fanning out the powder-air mixture stream and throwing off the powder particles from the spray head, conveying the powder particles onto the object to be coated by applying an electric field between the spray head and subject.
  • Spray systems are known (BE-A-766966), in which powder is fed to a baffle with the aid of compressed air as a powder-air mixture, which fans out the powder-air mixture, in which case partly due to the residual pulse of the powder grain present partly due to the electrical forces, which act on a charged powder grain in the electric field, the powder-air mixture is transported to the object to be coated.
  • the powder grain is charged either inside the spray system or outside it. As the powder particles hit the baffle plate with high energy, signs of wear and sintering occur here.
  • DE-A-2416 081 describes a spraying device for electrostatic powder coating systems in which a fluidized powder stream strikes a rotating, almost horizontal disc with blade-shaped webs at a certain angle and is then centrifugally centrifugally thrown off.
  • the disadvantage of this method is that the powder particles are sintered onto the disk or the webs due to the concentric supply of the powder particles at a distance from the axis of rotation and that considerable wear and tear occurs due to the high speed of the powder particles.
  • the invention has for its object to eliminate the wear and sintering problems that have occurred so far, to achieve easy process controllability and to solve the problems of undefined friction charging that occur at the same time in the known methods.
  • This object on which the invention is based is achieved in that the powder-air mixture, which is fluidized in a manner known per se, is freely supplied to the interior of the spray head in the axial center of the rotating spray head in the axial direction, the vacuum generated by the spray head being blown into the conveying path by air of the powder-air mixture is controlled in such a way that the conveying speed is decelerated and then the powder-air mixture is positively accelerated to the bell rim and transported to the rim of the bell with the spray head and spun off.
  • This measure completely avoids the wear and sintering problems that have previously occurred and at the same time eliminates the undefined friction charges.
  • a device for carrying out the method is based on a coating device with a spray head rotating around a central axis and a central feed of the powder-air mixture, as described in BE-A-766 966.
  • the device according to the invention is characterized in that a number of radial compressed air nozzles are provided in the central feed line.
  • the device has a nozzle ring arranged in the rear area of the spray head, which creates an annular air jacket, so that the air balance around the rotating spray head is ensured and the sprayed powder cone is given a defined axial thrust by the circular, rotating air curtain.
  • the fluidized powder stream is fed to the spray head through the fixed hollow axis in the region of the lowest relative speed and the lowest centrifugal acceleration.
  • the pitch circle diameter and the bore geometry of the nozzle ring are chosen accordingly in relation to the air flow.
  • 1 denotes a feed line designed as a hollow shaft, which supports bearings 10, 10 ', a spray head 2 with a rotor 5, a stator 11 of the drive motor and a dynamic seal 15.
  • An electrical feed line 8 for the stator 11 is guided in a groove 14 on the feed line 1 through the bearing 10 '.
  • the feed line 1 ends in a diffuser 12 which carries the fluidized powder directly to the suction edge feeds a rotor blade 3 of the compressor.
  • a disc 4 prevents the compressor from flowing into the half space located in front of the spray head 2.
  • the ratio of air to fluidized powder can be influenced by a radial ring of compressed air nozzles 7 in such a way that the powder feed can be interrupted.
  • Nozzle bores 9 of a compressed air nozzle ring 6 produce an annular air curtain which imparts an axial thrust to the powder curtain which is thrown off at an edge 13.
  • the device is driven by a turbine drive with a rotor 16 and a nozzle ring 17 instead of by an electric drive.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Photoreceptors In Electrophotography (AREA)

Claims (8)

1. Procédé pour le revêtement électrostatique d'objets au moyen de poudre par amenée d'un mélange de poudre et d'air à une tête de projection, étalement du courant de mélange de poudre et d'air et projection des particules de poudre depuis la tête de projection, amenée des particules de poudre en direction de l'objet à revêtir par application d'un champ électrique entre la tête de projection et l'objet, caractérisé par le fait que de manière en elle-même connue, on amène librement le mélange fluidisé de poudre et d'air à la cavité intérieure de la tête de projection, au centre axial de la tête de projection en rotation, dans la direction axiale de celle-ci, la dépression engendrée par la tête de projection étant commandée par injection d'air dans le parcours du mélange de poudre et d'air de telle sorte que la vitesse de transport est ralentie et qu'alors, le mélange de poudre et d'air, accéléré entre 500 et 6000 tours/mn solidairement avec la tête de projection, est transporté jusqu'au bord de la cloche et projeté.
2. Appareil pour le revêtement électrostatique d'objets au moyen de poudre, présentant une tête de projection (2) tournant autour d'un axe central avec amenée centrale du mélange de poudre et d'air, caractérisé par le fait que dans le tuyau d'amenée centré (1) sont prévues un certain nombre de buses radiales à air comprimé (7).
3. Appareil selon la revendication 2, caractérisé par une couronne de buses (6) disposée dans la région postérieure de la tête de projection en forme de cloche (2) pour engendrer un rideau d'air annulaire.
4. Appareil selon la revendication 2, caractérisé par un moteur à rotor extérieur (5, 11) conçu sous forme de moteur électrique pour l'entraînement de la tête de projection (2).
5. Appareil selon la revendication 2, caractérisé par un moteur à rotor extérieur (5, 11) conçu sous forme de turbine à air comprimé (16, 17) pour l'entraînement de la tête de projection (2).
6. Appareil selon la revendication 2, caractérisé par le fait que le contour intérieur de la tête de projection (2) est muni de pales d'un seul tenant.
7. Appareil selon les revendications 2 et 4, caractérisé par le fait que le moteur électrique à rotor extérieur (5, 11) est relié à une haute tension et est actionné par l'intermédiaire d'un transformateur intermédiaire.
8. Appareil selon la revendication 7, caractérisé par le fait que la vitesse de rotation du moteur électrique à rotor extérieur (5, 11) est variable par variation de la fréquence synchrone.
EP81100608A 1980-02-15 1981-01-28 Procédé et dispositif pour le revêtement électrostatique en poudre d'objets Expired EP0034277B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100608T ATE9547T1 (de) 1980-02-15 1981-01-28 Verfahren und vorrichtung zum elektrostatischen pulverbeschichten von gegenstaenden.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3005678 1980-02-15
DE3005678A DE3005678C2 (de) 1980-02-15 1980-02-15 Verfahren und Vorrichtung zum elektrostatischen Pulverbeschichten von Gegenständen

Publications (3)

Publication Number Publication Date
EP0034277A2 EP0034277A2 (fr) 1981-08-26
EP0034277A3 EP0034277A3 (en) 1981-12-16
EP0034277B1 true EP0034277B1 (fr) 1984-09-26

Family

ID=6094701

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100608A Expired EP0034277B1 (fr) 1980-02-15 1981-01-28 Procédé et dispositif pour le revêtement électrostatique en poudre d'objets

Country Status (4)

Country Link
US (2) US4430359A (fr)
EP (1) EP0034277B1 (fr)
AT (1) ATE9547T1 (fr)
DE (2) DE3005678C2 (fr)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5518180A (en) * 1992-06-12 1996-05-21 Niro Holding A/S Rotary atomizer and a method of operating it
US6056215A (en) * 1995-03-15 2000-05-02 Nordson Corporation Electrostatic rotary atomizing spray device
US5697559A (en) * 1995-03-15 1997-12-16 Nordson Corporation Electrostatic rotary atomizing spray device
DE19537089A1 (de) * 1995-10-05 1997-04-10 Abb Research Ltd Verfahren und Einrichtung zum Pulversprühen
EP0780159B1 (fr) * 1995-12-19 1999-08-04 Toyota Jidosha Kabushiki Kaisha Appareil rotatif de pulvérisation électrostatique
US5637357A (en) * 1995-12-28 1997-06-10 Philips Electronics North America Corporation Rotary electrostatic dusting method
GR1003825B (el) * 2001-03-29 2002-02-26 Φυγοκεντρικη γεννητρια του αεροζολ
US6889921B2 (en) * 2002-09-30 2005-05-10 Illinois Tool Works Inc. Bell cup skirt
US7128277B2 (en) 2003-07-29 2006-10-31 Illinois Tool Works Inc. Powder bell with secondary charging electrode
US20050023385A1 (en) * 2003-07-29 2005-02-03 Kui-Chiu Kwok Powder robot gun
US20050056212A1 (en) * 2003-09-15 2005-03-17 Schaupp John F. Split shroud for coating dispensing equipment
US20050173556A1 (en) * 2004-02-09 2005-08-11 Kui-Chiu Kwok Coating dispensing nozzle
SE527802C2 (sv) * 2004-05-18 2006-06-07 Lind Finance & Dev Ab Kylning av motor
SE528338C2 (sv) * 2004-05-18 2006-10-24 Lind Finance & Dev Ab Motorstyrning för en målningsspindel
SE528095C2 (sv) * 2004-05-18 2006-09-05 Lind Finance & Dev Ab Axiallager
DE102006058562A1 (de) * 2006-12-12 2008-08-14 Dürr Systems GmbH Beschichtungseinrichtung mit einer Dosiervorrichtung
PL2101925T3 (pl) 2006-12-12 2015-06-30 Duerr Systems Gmbh Urządzenie powlekające z zespołem dozowania
GB0625583D0 (en) * 2006-12-21 2007-01-31 Itw Ltd Paint spray apparatus
US8371517B2 (en) 2007-06-29 2013-02-12 Illinois Tool Works Inc. Powder gun deflector
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
US10155233B2 (en) * 2008-04-09 2018-12-18 Carlisle Fluid Technologies, Inc. Splash plate retention method and apparatus
US20090314855A1 (en) * 2008-06-18 2009-12-24 Illinois Tool Works Inc. Vector or swirl shaping air

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973478C (de) * 1952-04-01 1960-03-03 Metallgesellschaft Ag Vorrichtung zur Ausbildung fein verteilter Nebel in Form einer Wolke fuer die Abscheidung im elektrostatischen Feld unter Anwendung eines Hilfsgasstromes
US2980338A (en) * 1954-03-04 1961-04-18 Fischer & Co H G Electrostatic paint spraying system
US3085749A (en) 1957-07-23 1963-04-16 Schweitzer Electrostatic Compa Electrostatic spray heads
US3057558A (en) 1958-02-19 1962-10-09 Schweitzer Electrostatic Compa Electrostatic atomizing head
US2893894A (en) 1958-11-03 1959-07-07 Ransburg Electro Coating Corp Method and apparatus for electrostatically coating
DE1973478U (de) 1962-07-21 1967-11-30 Siemens Ag Notstromversorgungsaggregat.
GB1053514A (fr) * 1963-02-19 1900-01-01
US4114564A (en) 1963-06-13 1978-09-19 Ransburg Corporation Electrostatic coating apparatus
GB1298063A (en) * 1968-11-21 1972-11-29 Peabody Modernair Ltd Improvements in and relating to electrostatic coating
BE766966A (fr) * 1970-05-13 1971-10-01 Bosch Hausgeraete Gmbh Dispositif pour projeter des produits de revetement pulverulents
DE2133095B1 (de) * 1971-07-02 1972-09-21 Buettner Schilde Haas Ag Rotierende Spruehvorrichtung fuer elektrostatische Pulverbeschichtungsanlagen
DE2416081C3 (de) * 1974-04-03 1979-04-05 Robert Bosch Gmbh, 7000 Stuttgart Sprühvorrichtung für elektrostatische Pulverbeschichtungsanlagen
US4275838A (en) 1977-09-12 1981-06-30 Ransburg Corporation Rotating atomizing device
FR2412351A1 (fr) 1977-12-20 1979-07-20 Air Ind Projecteur electrostatique de peinture a bol ou a disque tournant avec un joint d'etancheite pneumatique

Also Published As

Publication number Publication date
ATE9547T1 (de) 1984-10-15
US4450785A (en) 1984-05-29
DE3005678A1 (de) 1981-08-20
EP0034277A2 (fr) 1981-08-26
DE3166227D1 (en) 1984-10-31
EP0034277A3 (en) 1981-12-16
US4430359A (en) 1984-02-07
DE3005678C2 (de) 1982-06-24

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