EP0034277A2 - 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
EP0034277A2
EP0034277A2 EP81100608A EP81100608A EP0034277A2 EP 0034277 A2 EP0034277 A2 EP 0034277A2 EP 81100608 A EP81100608 A EP 81100608A EP 81100608 A EP81100608 A EP 81100608A EP 0034277 A2 EP0034277 A2 EP 0034277A2
Authority
EP
European Patent Office
Prior art keywords
bell
powder
spray
air
motor
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
EP81100608A
Other languages
German (de)
English (en)
Other versions
EP0034277B1 (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, i.e. the spraying being effected by centrifugal forces
    • 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, i.e. the spraying being effected by centrifugal forces 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 process for the electrostatic coating of objects by means of electrostatically charged powder grains by supplying a powder air mixture to a spray bell, 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 processed by applying an electric field between the spray bell and the object .
  • the powder grain is charged either inside the spray system or outside it.
  • a powder spray disc in which a fluidized powder stream impinges on a rotating, nearly vertical disc with blade-shaped webs at a certain angle and is then centrifugally centrifugally thrown off. Charging and particle transport to the object then takes place in a known manner.
  • the main disadvantage of this method is the limited area of application.
  • the disadvantages of the known methods are the lack of process controllability, the undefined friction charging due to high speeds and the high susceptibility to wear and sintering.
  • the invention has for its object to provide a method for the electrostatic coating of objects with a powder, in which 'undefined friction charging is avoided, wear is kept low, susceptibility to sintering is eliminated and good process controllability is achieved at the same time.
  • This object on which the invention is based is achieved in that a fluidized powder stream, that is to say a flowable powder-air mixture, is fed at a low speed to the spray bell, is minimally accelerated at the transition to the rotating bell, then accelerated to 5,000 to 6,000 rpm, transported to the edge of the bell and is then thrown off.
  • a fluidized powder stream that is to say a flowable powder-air mixture
  • the device for carrying out this method is characterized by a bell rotating about a fixed axis and equipped with a central feed for the powder flow, the central feed having a number of compressed air nozzles.
  • the method according to the invention thus works with a bell serving as a high-voltage electrode with the additional use of compressed air, the mass flow of the fluidized powder being fed to the bell rotating at a speed of preferably 5,000 to 6,000 rpm.
  • This mass flow is sucked in by the bell, which is designed like a compressor, transported to the bell rim in a form-fitting manner and flung off there depending on the geometric and kinematic bell parameters.
  • the mass throughput and the powder cloud geometry can be changed by changing the suction state, for example by introducing compressed air and / or changing the speed.
  • the powder grain passes through an annular air curtain.
  • the position of the swirl axis is not subject to any restrictions.
  • the fluidized powder stream is fed to the bell through the fixed hollow axis in the region of the lowest relative speed and the lowest centrifugal acceleration.
  • nozzle bores are provided on one or more partial circles, one of which is preferably larger than the diameter of the flinging edge.
  • the pitch circle diameter and the bore geometry are in relation to the air flow rate selected so that the air balance around the rotating bell is ensured, and the sprayed powder cone contains a defined axial thrust due to the circular air curtain.
  • the bell provided according to the invention can be driven either pneumatically or electrically. In the case of an electric motor, this is expediently connected to high voltage and is operated via an isolating transformer. An asynchronous motor is advantageously used as the electric motor, the speed of which can be changed by influencing the synchronous frequency.
  • the embodiment shown in longitudinal section in FIG. 1 has the hollow shaft 1, which carries the bearings 1 0 , 1 0 'of the bell 2 with the rotor 5, the stator 11 of the drive motor and the dynamic seal 15.
  • the electrical lead 8 for the stator 11 is guided in a groove 14 on the hollow shaft through the bearing 10.
  • the hollow shaft ends in a diffuser 12, which feeds the fluidized powder directly to the suction edge of the rotor blades 3 of the bell compressor.
  • the disc 4 prevents the bell compressor from flowing in from the half space in front of the bell.
  • the ratio of air to fluidized powder can be influenced by the radial nozzle ring 7 in such a way that the powder feed can be interrupted.
  • the nozzle bores 9 of the nozzle ring 6 produce an annular air curtain which imparts an axial thrust to the powder curtain which is thrown off at the edge 13.
  • FIG. 2 differs from that of FIG. 1 only in that a turbine drive with rotor 16 and nozzle ring 17 is provided instead of an electric drive.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Photoreceptors In Electrophotography (AREA)
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
DE3005678A DE3005678C2 (de) 1980-02-15 1980-02-15 Verfahren und Vorrichtung zum elektrostatischen Pulverbeschichten von Gegenständen
DE3005678 1980-02-15

Publications (3)

Publication Number Publication Date
EP0034277A2 true EP0034277A2 (fr) 1981-08-26
EP0034277A3 EP0034277A3 (en) 1981-12-16
EP0034277B1 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
DE69603567T2 (de) * 1995-12-19 2000-05-04 Toyota Motor Co Ltd Rotierende elektrostatische Sprühvorrichtung
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
SE528095C2 (sv) * 2004-05-18 2006-09-05 Lind Finance & Dev Ab Axiallager
SE528338C2 (sv) * 2004-05-18 2006-10-24 Lind Finance & Dev Ab Motorstyrning för en målningsspindel
SE527802C2 (sv) * 2004-05-18 2006-06-07 Lind Finance & Dev Ab Kylning av motor
DE102006058562A1 (de) * 2006-12-12 2008-08-14 Dürr Systems GmbH Beschichtungseinrichtung mit einer Dosiervorrichtung
RU2427432C2 (ru) 2006-12-12 2011-08-27 Дюрр Системз Гмбх Устройство для нанесения покрытий с дозировочным устройством
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2980338A (en) * 1954-03-04 1961-04-18 Fischer & Co H G Electrostatic paint spraying system
FR88538E (fr) * 1963-02-19 1967-02-17 Sames Mach Electrostat Perfectionnements à l'émaillage électrostatique de baignoires ou autres corps creux
GB1298063A (en) * 1968-11-21 1972-11-29 Peabody Modernair Ltd Improvements in and relating to electrostatic coating

Family Cites Families (10)

* 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
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
US4114564A (en) * 1963-06-13 1978-09-19 Ransburg Corporation Electrostatic coating apparatus
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2980338A (en) * 1954-03-04 1961-04-18 Fischer & Co H G Electrostatic paint spraying system
FR88538E (fr) * 1963-02-19 1967-02-17 Sames Mach Electrostat Perfectionnements à l'émaillage électrostatique de baignoires ou autres corps creux
GB1298063A (en) * 1968-11-21 1972-11-29 Peabody Modernair Ltd Improvements in and relating to electrostatic coating

Also Published As

Publication number Publication date
DE3005678A1 (de) 1981-08-20
DE3166227D1 (en) 1984-10-31
DE3005678C2 (de) 1982-06-24
EP0034277B1 (fr) 1984-09-26
US4450785A (en) 1984-05-29
EP0034277A3 (en) 1981-12-16
US4430359A (en) 1984-02-07
ATE9547T1 (de) 1984-10-15

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