EP1238710A1 - 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
EP1238710A1
EP1238710A1 EP02004870A EP02004870A EP1238710A1 EP 1238710 A1 EP1238710 A1 EP 1238710A1 EP 02004870 A EP02004870 A EP 02004870A EP 02004870 A EP02004870 A EP 02004870A EP 1238710 A1 EP1238710 A1 EP 1238710A1
Authority
EP
European Patent Office
Prior art keywords
powder
air
channel
atomizer
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.)
Granted
Application number
EP02004870A
Other languages
German (de)
English (en)
Other versions
EP1238710B1 (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
Original Assignee
Duerr Systems 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 Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1238710A1 publication Critical patent/EP1238710A1/fr
Application granted granted Critical
Publication of EP1238710B1 publication Critical patent/EP1238710B1/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
    • 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 methods for Series coating of workpieces with powder coating material according to the preamble of the independent claims.
  • the invention relates to an electrostatic Rotary atomizer with one in operation at high voltage potential lying powder atomization bell as he is for the series coating of vehicle bodies is used.
  • the problem with powder atomizers is that there is coating material not just in the supply lines and in that Powder channel can settle inside the atomizer, but also in the way of the powder-air mixture after exiting the Mouth of the powder channel, in the example considered one Rotary atomizer in particular in the gap channel of the Bell cup.
  • this powder deposits must be removed was flushed through the external powder hose directed the atomizer.
  • the cleaning of the Atomizer with the one supplied through the external powder hose Air can be different for various reasons prove inadequate and unsatisfactory.
  • the air content in the powder-air mixture only from the dosing system (e.g. injector or powder pump) can be determined, especially in low-air conveyor systems to pump effects and undesirable changes in the powder spray come.
  • the dosing system e.g. injector or powder pump
  • the object of the invention is powder atomizers or powder coating processes specify that on simple, more reliable and time-saving way disruption of operations in particular avoided by powder deposits.
  • the supply of the purge air during the coating breaks requires less energy and is much more efficient than before, since they go without a detour via the usually up to 15 m long external powder hose directly into the atomizer is directed. It is also pure air that is not contaminated by residual powder and therefore immediately and without Delay full cleaning effect unfolds. Particularly advantageous is the previously non-existent possibility of a targeted effective cleaning of the bell plate during production corresponding to that known and customary in wet paint atomizers Short rinse function u. a. thanks to the practically delay-free Supply of the purge air.
  • an additional air duct for the additional entry of dosing air before atomization and to change the air content in the powder-air mixture independent of the usual dosing system be used. So u. a. the instabilities mentioned and also counteracted the tendency to deposit powder become.
  • the additional air can also be easily Way, spray jet size, particle speed and others Effectively influence and stabilize parameters.
  • Electrostatic powder rotary atomizer is the invention explained in more detail.
  • the rotary atomizer which is only partially shown, can be up to the features of the invention explained below the known Atomizers of the Dürr / Behr N34040001 type. It contains like this a front atomizer housing 1, in which the drive turbine 2 operated with compressed air with the rotatable mounted hollow shaft 3 is located. In the exposed open The end of the hollow shaft 3 is the hollow cylindrical hub part 5 Atomizer bell 4 attached. Extends through the hollow shaft 3 coaxial a cylindrical serving as a powder channel of the atomizer Tube 6 into the hub part 5 of the bell 4, where it is shown at 7 axially outside the atomizer housing 1 ends. The powder tube 6 is in the atomizer coming from an external air and powder supply Powder hose (not shown) connected.
  • the (not shown) high voltage generator for the coating powder atomizer bell charging to the usual potential 4 can also be accommodated in the atomizer, for example in the housing 1.
  • the atomizer bell also commonly known as a bell plate 4 consists essentially of a in a known manner with the hub part 5 integral outer part 8, which the Atomizer housing 1 facing conical surface 9 and the inner conical Surface 10 has the shape shown, and one in the Space in front of the surface 10 seated inner part 12, which is one of the Surface 10 opposite to form a gap channel 14 Has inner surface 16 and rigidly connected to the outer part 8 is.
  • the gap channel 14 is thus from the two conical surfaces 10 and 16 limited. Surfaces 10 and 16 could be parallel to each other, but it may be more convenient if their gap towards the outside decreases, the fissure channel 14 tapered as shown.
  • the inner bell part 12 has a central cylindrical projection 21 which in a coaxial to the atomizer axis on or in front of the mouth 7 of the Powder tube 6 lying conical tip 22 ends and thus the powder-air mixture escaping there through the bell there emerging powder-air mixture in the through the bell 4 up to the spray edge 24 extending gap channel 14.
  • the hollow shaft 3 has a separate, additional air duct 30, the z. B. via a (not shown) coaxial ring channel in the back of the atomizer to one in the atomizer leading compressed air line is connected.
  • Quantity, speed and / or pressure of the air in the duct 30 can be in are controlled and regulated in a manner known per se.
  • the Air duct 30 extends along the powder tube 6 into the Hub part 5 of the atomizer bell 4, so that it is immediately on the mouth of the tube 6 in the path of the exiting there powder-air mixture flowing into the gap channel 14 of the bell cup empties.
  • the mouth end of the air duct 30 forming annular gap 31, for example within the hub part 5 can be a bit flatter than the area further back, so that the additional air flow emerges accelerated accordingly can.
  • the path of the powder-air mixture emerging from the powder channel, into which the additional air duct 30 opens is preferred completed to the outside.
  • the air duct 30 opens into the through the outer bell part 8 closed space through which the mouth of the powder tube 6 with the gap channel 14 of the bell 4 in connection stands.
  • the spray cone of the atomized Powder-influencing steering air can be directed from (not shown) nozzles in the front of the atomizer housing 1 arranged steering air ring 28 emerges. Further can also from a face of the so-called rear atomizer housing, not shown Free air directed towards the outside of the atomizer housing 1 to keep dust and powder mist away from the housing.
  • the clearance air can be constant or only for a short time Cleaning times are turned on and is usually like this weakly dosed that it has no influence on the spray cone.
  • the additional air from the separate channel 30 depending on the operating conditions and application either switched off or for influencing and changing the atomizer bell 4 from the powder channel guided mixture can be used.
  • the path of the turbine output air is not shown. He can run outside the air duct 30, which in any case a controlled air source separated from the turbine becomes. Those for rinsing the bell plate during coating breaks The amount of air required is usually more than 200 standard liters (Nl) / min. During the coating operation the additional air from duct 30 can be switched off, if no additional entry of dosing air is required.
  • the invention is not only suitable for the example chosen Rotary atomizer, but especially for similar ones or other atomizers with any other designed bell plates.
  • the invention is not for rotary atomizers limited, but also for example for electrostatic or other powder guns applicable.
  • the additional air in the powder-air mixture supplied from the outside instead of from a Atomizer axis also concentric through annular opening Nozzles, slots, holes or other openings initiated be distributed symmetrically around the powder channel or in particular in the case of rotary atomizers u.
  • U. one-sided can be arranged.
  • the additional air serving as purge air not just at the mouth of the external pulse supply enter the powder channel of the atomizer, but instead an upstream point, for example at the powder inlet of the atomizer.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Nozzles (AREA)
  • Manufacturing Of Micro-Capsules (AREA)
  • Spray Control Apparatus (AREA)
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 true EP1238710A1 (fr) 2002-09-11
EP1238710B1 EP1238710B1 (fr) 2006-09-06

Family

ID=27766664

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)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2143500A2 (fr) 2002-01-24 2010-01-13 Dürr Systems GmbH Procédé et pulvérisateur pour le revêtement de pièces en séries

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940061A (en) * 1974-09-16 1976-02-24 Champion Spark Plug Company Electrostatic spray gun for powder coating material
DE3003684A1 (de) * 1980-02-01 1981-08-06 ESB Elektrostatische und G.F. Vöhringer GmbH, 7758 Meersburg Pulverzerstaeuber mit spuelvorrichtung
US5353995A (en) * 1992-06-10 1994-10-11 Sames S.A. Device with rotating ionizer head for electrostatically spraying a powder coating product
FR2706328A1 (fr) * 1993-06-17 1994-12-23 Sames Sa Projecteur électrostatique de produit de revêtement pulvérulent comportant une tête de projection rotative.

Family Cites Families (9)

* 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
US4360155A (en) * 1979-12-21 1982-11-23 G & R Electro-Powder Coating Corporation Powder coating distributor
DE8631764U1 (de) * 1986-11-27 1987-06-25 Ucosan B.V., Roden Austrittsdüse für das Austrittsventil einer Whirlpool-Wanne
JPH1015440A (ja) * 1996-07-08 1998-01-20 Ransburg Ind Kk 静電塗装機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940061A (en) * 1974-09-16 1976-02-24 Champion Spark Plug Company Electrostatic spray gun for powder coating material
DE3003684A1 (de) * 1980-02-01 1981-08-06 ESB Elektrostatische und G.F. Vöhringer GmbH, 7758 Meersburg Pulverzerstaeuber mit spuelvorrichtung
US5353995A (en) * 1992-06-10 1994-10-11 Sames S.A. Device with rotating ionizer head for electrostatically spraying a powder coating product
FR2706328A1 (fr) * 1993-06-17 1994-12-23 Sames Sa Projecteur électrostatique de produit de revêtement pulvérulent comportant une tête de projection rotative.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2143500A2 (fr) 2002-01-24 2010-01-13 Dürr Systems GmbH Procédé et pulvérisateur pour le revêtement de pièces en séries

Also Published As

Publication number Publication date
US20050001056A1 (en) 2005-01-06
ATE338585T1 (de) 2006-09-15
US20030080206A1 (en) 2003-05-01
EP1238710B1 (fr) 2006-09-06
DE50208039D1 (de) 2006-10-19
US6913214B2 (en) 2005-07-05
ES2269534T3 (es) 2007-04-01

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