EP1238710B1 - Appareil de projection de poudre et procédé pour revêtement par poudre - Google Patents

Appareil de projection de poudre et procédé pour revêtement par poudre Download PDF

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Publication number
EP1238710B1
EP1238710B1 EP02004870A EP02004870A EP1238710B1 EP 1238710 B1 EP1238710 B1 EP 1238710B1 EP 02004870 A EP02004870 A EP 02004870A EP 02004870 A EP02004870 A EP 02004870A EP 1238710 B1 EP1238710 B1 EP 1238710B1
Authority
EP
European Patent Office
Prior art keywords
powder
channel
air
atomiser
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.)
Expired - Lifetime
Application number
EP02004870A
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German (de)
English (en)
Other versions
EP1238710A1 (fr
Inventor
Thomas Dürr
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.)
Duerr Systems AG
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Duerr Systems AG
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Filing date
Publication date
Application filed by Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1238710A1 publication Critical patent/EP1238710A1/fr
Application granted granted Critical
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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
    • B05B5/0407—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 with a spraying edge, e.g. like a cup or a bell
    • 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
    • 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
    • B05B3/1092—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
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • the invention relates to powder atomizers and to processes for the serial coating of workpieces with pulverulent coating material according to the preamble of the independent patent claims.
  • the invention relates to an electrostatic rotary atomizer having a powder atomizing bell which is in operation at a high voltage potential and which is used for the serial coating of vehicle bodies.
  • FR-A-2 706 328 discloses a rotary atomizer for powder coating with an air turbine, the exhaust air of which flows between the hollow shaft of the atomizer and the central powder tube in the direction of the bell cup. It is intended to prevent powder settling on the outside of the powder tube or penetrating into the turbine, and may also serve as dilution air for the powder-air mixture. All features of the respective preambles of claims 1 and 7 are disclosed by FR-A-2 706 328.
  • the disassembly and manual cleaning of the bell cup is laborious and time consuming and does not eliminate the risk of cross-sectional constriction or even blockage in the bell cup during operation.
  • cleaning the nebulizer with air supplied by the external powder hose may prove inadequate and unsatisfactory for various other reasons.
  • considerable energy expenditure is required to promote the purging air through the external powder hose because of its length, if a cleaning effect is to be achieved.
  • the air intended for cleaning is at least initially loaded by so much residual powder from the hose that a cleaning effect only occurs after a relatively long time, which is lost to the coating operation.
  • the object of the invention is to provide Pulverzerstäuber or powder coating process, which avoids disturbances of operation, in particular by powder deposits in a simple, reliable and time-saving manner.
  • the additional air duct can be used for the additional entry of dosing air before atomization and to change the proportion of air in the powder-air mixture, regardless of the usual dosing. This can u. a. be counteracted the instabilities mentioned and thereby the tendency to powder deposition.
  • the additional air also makes it possible to influence and stabilize spray jet size, particle velocity and other parameters in a simple manner.
  • the only partially illustrated rotary atomizer can, except for the features of the invention explained in the following, be known Atomizers of the type Dürr / Behr N34040001 correspond.
  • it contains a front atomizer housing 1, in which the drive turbine 2, which is operated with compressed air, is located with the rotatably mounted hollow shaft 3.
  • the drive turbine 2 which is operated with compressed air
  • the hollow shaft 3 of the hollow cylindrical hub part 5 of the atomizer 4 is fixed.
  • the powder tube 6 is connected in the atomizer to a coming from an external air and powder supply powder hose (not shown).
  • the (not shown) high voltage generator for the coating powder to the usual potential charging atomizer 4 can also be accommodated in the atomizer, for example in the housing first
  • bell cup atomizer 4 consists in a known manner substantially from a one-piece with the hub part 5 outer part 8, which has the atomizer housing 1 facing conical surface 9 and the inner conical surface 10 of the illustrated shape, and in front of the room the surface 10 seated inner part 12, which has one of the surface 10 to form a gap channel 14 opposite inner surface 16 and is rigidly connected to the outer part 8.
  • the gap channel 14 is thus limited by the two conical surfaces 10 and 16.
  • the surfaces 10 and 16 could be parallel to each other, but it may be more appropriate, if their distance decreases in the outward direction, the gap channel 14 thus tapers as shown.
  • the inner bell member 12 has a central cylindrical projection 21 which terminates in a coaxial with the Zerstäuberachse at or in front of the mouth 7 of the powder tube 6 conical tip 22 and thus exiting there powder-air mixture in the through the bell there exiting powder-air mixture in the through the bell 4 to the spray-off edge 24 extending gap channel 14 directs.
  • a separate, additional air channel 30 is formed between the outer periphery of the powder tube 6 and the inner wall of the hollow shaft 3, the z. B. is connected via a (not shown) coaxial annular channel in the rear part of the atomizer to a leading into the atomizer compressed air line.
  • the amount, velocity and / or pressure of the air in the channel 30 can be controlled and regulated in a manner known per se.
  • the air channel 30 extends along the powder tube 6 into the hub portion 5 of the atomizer 4, so that it opens directly at the mouth of the tube 6 in the path of there emerging and flowing into the gap channel 14 of the bell cup powder-air mixture.
  • the annular gap 31 forming the mouth end of the air duct 30, for example inside the hub part 5, may be somewhat shallower than in the area further down, so that the additional air flow can emerge correspondingly accelerated.
  • the path of the powder-air mixture emerging from the powder channel, into which the additional air channel 30 opens, is preferably closed to the outside.
  • the air duct 30 opens into the closed by the outer bell part 8 to the outside space through which the mouth of the powder tube 6 is in communication with the gap channel 14 of the bell 4.
  • the spray cone of the atomized powder steering air which emerges from (not shown) nozzles of a arranged in the front end of the atomizer housing 1 shaping air ring 28. Further can be directed in a known manner from an end face of the rear atomizer housing, not shown, so-called free-hold air on the outside of the atomizer housing 1 to keep dust and powder mist from the housing.
  • the free-standing air can be switched on constantly or only for short cleaning times and is usually dosed so weakly that it has no influence on the spray cone.
  • the additional air from the separate channel 30, depending on operating conditions and application either switched off or used to influence and change the guided from the powder channel in the atomizer 4 mixture.
  • the additional air serves as purge air for cleaning the entire powder path from the mouth 7 of the powder tube 6 to the spray edge 24 including the gap channel 14th
  • the path of the output air of the turbine is not shown. It can run outside of the air duct 30, which in any case is connected to a separate controlled from the turbine air source.
  • the amount of air required to rinse the bell cup during coating pauses is usually more than 200 standard liters (Nl) / min. During the coating operation, the additional air from the duct 30 may be shut off if no additional supply of dosing air is required.
  • the invention is suitable not only for the rotary atomizer chosen as an example, but in particular for similar or other atomizers with any other shaped bell plates.
  • the invention is not limited to rotary atomizers but, for example, also applicable to electrostatic or other powder guns.
  • the additional air in the supplied from the outside powder-air mixture instead of a concentric to the Zerstäuberachse annular opening are also introduced through nozzles, slots, holes or other openings, which are distributed symmetrically around the powder channel or in particular in the case of Rotationszerstäubern u. U. can also be arranged on one side.

Claims (11)

  1. Pulvérisateur de poudre pour une installation de revêtement en série de pièces avec un matériau de revêtement pulvérulent, comportant un canal à poudre (6) menant à travers le pulvérisateur jusqu'à une ouverture d'embouchure (7), lequel est raccordé ou peut être raccordé à une conduite externe pour l'alimentation du pulvérisateur avec un mélange de poudre de revêtement et d'air, le mélange de poudre et d'air s'écoulant à travers le canal à poudre (6) et sortant de l'ouverture d'embouchure (7) étant pulvérisé, comportant un canal à air (30) supplémentaire qui débouche au droit de l'ouverture d'embouchure (7) du canal à poudre (6), et comportant en particulier une turbine d'entraînement (2) pour une cloche de pulvérisateur (4), caractérisé en ce que l'air à introduire, depuis le canal à air (30) supplémentaire dans la voie (14) du mélange sortant de l'ouverture d'embouchure (7) du canal à poudre (6), peut être commandé pour laver cette voie (14) dans les pauses d'application du revêtement et/ou pour régler une proportion d'air voulue dans le mélange de poudre et d'air, le canal à air (30) supplémentaire étant raccordé à une source d'air séparée commandée par la turbine d'entraînement (2), lorsqu'est prévue une turbine d'entraînement (2), et/ou l'air provenant du canal à air (30) supplémentaire peut être exclu pendant l'application du revêtement.
  2. Pulvérisateur de poudre selon la revendication 1, caractérisé en ce que le canal à air (30) supplémentaire débouche d'une fente annulaire (31) entourant l'extrémité d'embouchure du canal à poudre (6).
  3. Pulvérisateur de poudre selon la revendication 1 ou 2 avec une cloche de pulvérisateur (4) tournant pendant l'application du revêtement, qui est fixé à un arbre creux (3) contenant le canal à poudre (6) et contient une voie menant à son bord de pulvérisation (24), par laquelle s'écoule le mélange de poudre et d'air sortant du canal à poudre (6), caractérisé en ce que l'air supplémentaire est guidé dans la voie (14) menant au bord de pulvérisation (24).
  4. Pulvérisateur de poudre selon la revendication 3, caractérisé en ce que l'air supplémentaire est guidé dans un canal en fente (14).
  5. Pulvérisateur de poudre selon la revendication 4, caractérisé en ce que le canal en fente (14) est délimité par des surfaces coniques (10, 16) à l'intérieur de la cloche de pulvérisateur (4).
  6. Pulvérisateur de poudre selon l'une des revendications 3 à 5, caractérisé en ce que le canal à air (30) supplémentaire enferme en anneau le canal à poudre (6) à l'intérieur de l'arbre creux (3).
  7. Procédé de revêtement en série de pièces avec un matériau de revêtement pulvérulent par utilisation d'un pulvérisateur de poudre comportant un canal à poudre (6) menant à travers le pulvérisateur, dans lequel s'écoule un mélange, amené depuis une conduite de poudre externe, constitué d'une poudre de revêtement et d'air, vers une ouverture d'embouchure (7), et comportant en particulier une turbine d'entraînement (2) pour une cloche de pulvérisateur (4) rotative, le mélange de poudre et d'air s'écoulant à travers le canal à poudre (6) et sortant de l'ouverture d'embouchure (7) étant pulvérisé, caractérisé en ce que pendant les pauses d'application du revêtement de l'air provenant d'un canal à air (30) supplémentaire et servant au lavage et au nettoyage, qui est amené au pulvérisateur à l'extérieur de la conduite de poudre externe, est introduit dans le canal à poudre (6) ou dans la voie (14) du mélange sortant de l'ouverture d'embouchure du canal à poudre (6), le canal à air (30) supplémentaire étant raccordé à une source d'air séparée commandée par la turbine d'entraînement (6), lorsqu'une turbine d'entraînement (2) est prévue, et/ou l'air provenant du canal à air (30) supplémentaire peut être exclu pendant l'application du revêtement.
  8. Procédé selon la revendication 7, caractérisé en ce que pendant l'application du revêtement l'air provenant du canal à air supplémentaire (30) et se mélangeant au mélange amené par la conduite de poudre externe, et qui est amené au pulvérisateur à l'extérieur de la conduite de poudre externe, est introduit dans le canal à poudre (6) ou dans la voie du mélange sortant de l'ouverture d'embouchure (7) du canal à poudre (6).
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que l'air provenant du canal à air (30) supplémentaire est introduit directement au droit de l'ouverture d'embouchure (7) du canal à poudre (6).
  10. Procédé selon la revendication 7 ou 8, caractérisé en ce que l'air provenant du canal à air (30) supplémentaire est introduit dans le canal à poudre (6) du pulvérisateur en amont de son ouverture d'embouchure (7).
  11. Procédé selon l'une des revendications 7 à 10, caractérisé en ce que la quantité d'air supplémentaire pour le lavage est d'au moins 200 Nl/mn.
EP02004870A 2001-03-08 2002-03-04 Appareil de projection de poudre et procédé pour revêtement par poudre Expired - Lifetime EP1238710B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10111209 2001-03-08
DE10111209 2001-03-08
US10/053,455 US20030080206A1 (en) 2001-03-08 2001-10-25 Powder bell purge tube

Publications (2)

Publication Number Publication Date
EP1238710A1 EP1238710A1 (fr) 2002-09-11
EP1238710B1 true EP1238710B1 (fr) 2006-09-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02004870A Expired - Lifetime EP1238710B1 (fr) 2001-03-08 2002-03-04 Appareil de projection de poudre et procédé pour revêtement par poudre

Country Status (5)

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US (2) US20030080206A1 (fr)
EP (1) EP1238710B1 (fr)
AT (1) ATE338585T1 (fr)
DE (1) DE50208039D1 (fr)
ES (1) ES2269534T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10202712A1 (de) 2002-01-24 2003-07-31 Duerr Systems Gmbh Verfahren zum Steuern der Sprühstrahlbreite eines Zerstäubers und Zerstäuber für die Serienbeschichtung von Werkstücken
US7721976B2 (en) * 2002-07-22 2010-05-25 Durr Systems, Inc. High speed rotating atomizer assembly
DE10321614A1 (de) * 2003-05-14 2004-12-30 P + S Pulverbeschichtungs- Und Staubfilteranlagen Gmbh Beschichtungsverfahren sowie Pulverdüse und Beschichtungskabine

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955565A (en) * 1956-03-19 1960-10-11 Electro Dispersion Corp Electrostatic coating apparatus
US4114564A (en) * 1963-06-13 1978-09-19 Ransburg Corporation Electrostatic coating apparatus
US3292860A (en) * 1963-10-28 1966-12-20 Ransburg Electro Coating Corp Electrostatic spray coating apparatus
US3233655A (en) * 1964-05-07 1966-02-08 Stratford Eng Corp Liquid atomization apparatus
FR1595173A (fr) * 1968-12-17 1970-06-08
US3630441A (en) * 1970-10-30 1971-12-28 Tunzini Sames Electrostatic spraying apparatus
US3940061A (en) * 1974-09-16 1976-02-24 Champion Spark Plug Company Electrostatic spray gun for powder coating material
US4360155A (en) * 1979-12-21 1982-11-23 G & R Electro-Powder Coating Corporation Powder coating distributor
DE3003684A1 (de) * 1980-02-01 1981-08-06 ESB Elektrostatische und G.F. Vöhringer GmbH, 7758 Meersburg Pulverzerstaeuber mit spuelvorrichtung
DE8631764U1 (fr) * 1986-11-27 1987-06-25 Ucosan B.V., Roden, Nl
FR2692173B1 (fr) * 1992-06-10 1994-09-02 Sames Sa Dispositif de projection électrostatique d'un produit de revêtement en poudre à tête d'ionisation tournante.
FR2706328B1 (fr) * 1993-06-17 1995-09-29 Sames Sa Projecteur électrostatique de produit de revêtement pulvérulent comportant une tête de projection rotative.
JPH1015440A (ja) * 1996-07-08 1998-01-20 Ransburg Ind Kk 静電塗装機

Also Published As

Publication number Publication date
ES2269534T3 (es) 2007-04-01
DE50208039D1 (de) 2006-10-19
US20030080206A1 (en) 2003-05-01
EP1238710A1 (fr) 2002-09-11
US20050001056A1 (en) 2005-01-06
ATE338585T1 (de) 2006-09-15
US6913214B2 (en) 2005-07-05

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