EP0421866A1 - Vorrichtung zum Spritzen eines Beschichtungsproduktes mit einem drehenden Sprühelement - Google Patents

Vorrichtung zum Spritzen eines Beschichtungsproduktes mit einem drehenden Sprühelement Download PDF

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Publication number
EP0421866A1
EP0421866A1 EP90402719A EP90402719A EP0421866A1 EP 0421866 A1 EP0421866 A1 EP 0421866A1 EP 90402719 A EP90402719 A EP 90402719A EP 90402719 A EP90402719 A EP 90402719A EP 0421866 A1 EP0421866 A1 EP 0421866A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
rotary member
jet
axis
veil
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
EP90402719A
Other languages
English (en)
French (fr)
Other versions
EP0421866B1 (de
Inventor
Patrice Giroux
Gérard Degli
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.)
Sames SA
Original Assignee
Sames SA
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 Sames SA filed Critical Sames SA
Publication of EP0421866A1 publication Critical patent/EP0421866A1/de
Application granted granted Critical
Publication of EP0421866B1 publication Critical patent/EP0421866B1/de
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
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B05B15/555—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids discharged by cleaning nozzles
    • 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

Definitions

  • the invention relates to a device for spraying a coating product with a rotary spraying member, such as for example a spray bowl rotating at high speed, commonly used in the automotive industry, in particular; it relates more particularly to an improvement making it possible to ensure rapid and effective cleaning of all the parts of the rotary member with a relatively low consumption of cleaning product.
  • a rotary spraying member such as for example a spray bowl rotating at high speed, commonly used in the automotive industry, in particular; it relates more particularly to an improvement making it possible to ensure rapid and effective cleaning of all the parts of the rotary member with a relatively low consumption of cleaning product.
  • rotary members are often used for spraying the coating product, in particular in the form of a bowl.
  • a rotary member is driven at high speed by a turbine (commonly rotating between 20 and 30,000 revolutions per minute) and is brought to a high voltage.
  • the shape of such a bowl is relatively complex, which poses cleaning problems.
  • cleaning for a change of coating product must be rapid. It is generally carried out by spraying cleaning product (solvent) on the various parts of the spraying member rotating at high speed. We then come up against various problems.
  • Document DE-U-8607841 describes a rotary bowl projection device in which the frustoconical external surface of the bowl can be cleaned by diverging jets of solvent from nozzles located in the support housing the drive means of the rotary bowl. Given the characteristics of liquids, this divergence can only be obtained by a jet sprayed in droplets. These are driven by the air rotated by the bowl, which results in a loss of efficiency. According to the teaching of this document, the sprayed solvent which meets the surface to be cleaned over substantially the entire axial length thereof is then ejected radially by centrifugal force, which causes significant splashing.
  • the invention makes it possible to solve all these problems and proposes an arrangement comprising no cleaning nozzle and / or mobile interceptor.
  • the equipment is therefore less expensive and its operation is much more reliable.
  • the amount of cleaning product used is also lower.
  • the invention stems from the surprising observation that the splashes of cleaning product due essentially to the cleaning of the generally convex parts of the projection member could be eliminated (despite the centrifugal acceleration of several tens of thousands of m / s2 which tends to eject the coating product radially), by bringing into play, other phenomena tending to maintain the film of coating product on the surface such as, presumably, the surface tension and the Coanda effect.
  • the invention therefore relates to a device for spraying a coating product with a rotary spraying member, characterized in that it comprises at least one nozzle for ejecting a cleaning product, fixed relative to the support of said rotary member. and directed towards a generally convex surface thereof, so that its jet meets this surface with a significant incidence, said nozzle being arranged in close proximity to said generally convex surface at the rear thereof.
  • the concept of incidence is to be considered here in the same way as in optics. It is therefore the angle made by the jet of cleaning liquid coming from a nozzle with respect to the normal to said generally convex surface, at the point of impact.
  • generally convex surface is understood here to mean any surface of the rotary spraying member such that the radial component of the centrifugal force tends to spray a liquid which is on this surface outside, as opposed to a concave surface for which the radial component of the centrifugal force on the contrary tends to press the liquid on said surface.
  • the spraying member has the general shape of a bowl
  • a generally convex surface is in particular the external surface of said bowl and, optionally, an approximately conical central prominence, extending axially from a veil. perpendicular to the axis of rotation and set back from the spray edge of the bowl.
  • the corresponding cleaning product ejection nozzle is located at the rear of the veil and the latter has a ring of holes made along a circular contour in the vicinity of the base of the protrusion and this nozzle is oriented so that part of its jet of cleaning liquid, not intercepted by the veil, meets the prominence under a desired incidence, for the cleansing of this prominence.
  • the cleaning liquid intercepted by the veil is used for cleaning the external front face of the veil.
  • the axis of the holes can be tilted in a sort of helix to reduce the interception time of the jet. It is also possible to tilt the axis of the jet (according to the direction of rotation of the rotary member) to give it a speed component in the same direction as this rotation. It can also be advantageous to give the front face of the veil a very slightly concave shape because the normal component of the centrifugal force on the product improves cleaning.
  • a coating product projection device comprising a turbine 11 housed in a support housing 12 and the rotary shaft 11 of which projects from the housing, carries a spray 14 whose external shape is approximately that of a bowl.
  • the bowl is brought to a high voltage.
  • This type of spraying member has an approximately frustoconical external face 16, ending, opposite the object to be covered, by a discharge edge 17 and a veil 18, generally perpendicular to the axis of rotation x′x of the spraying member and set back relative to the discharge edge 17.
  • This veil is connected to the internal face of the bowl and its internal face 18 a is extended axially by a fixed hub 19 mounted at the end of the shaft 11 has turbine.
  • the outer face 18b of the veil carries or has an approximately conical prominence 20 (rounded at its end) whose role, known, is to limit the parasitic deposits of coating product on the veil and to make the center of the front face cleanable from the back of the bowl.
  • Holes 22 are made in the veil along a circular contour in the vicinity of the junction of this veil with the internal face of the bowl.
  • the face 18b of the web can be slightly concave radially beyond said prominence. The deflection of the concavity can be 3 to 5mm.
  • the coating product is deposited on the inner face of the veil by a fixed supply nozzle 24, carried by the support box 12 and engaged in the space 26 defined between the internal surface of the bowl and the inner face of the veil.
  • the housing-support 12 includes compressed air supply means 27, for example an annular chamber having a plurality of air ejection holes 27a arranged along a circular contour at the rear of the rotary member 14 so as to create an "air envelope" driving the particles of coating product forward.
  • compressed air supply means 27 for example an annular chamber having a plurality of air ejection holes 27a arranged along a circular contour at the rear of the rotary member 14 so as to create an "air envelope" driving the particles of coating product forward.
  • the spraying member as described so far is known.
  • At least one cleaning product ejection nozzle is provided, fixed relative to the support 12, that is to say carried by it and directed towards such a so-called “generally convex" surface with an orientation such that its jet of cleaning liquid meets this surface with a significant incidence.
  • a cleaning product ejection nozzle 28 is provided, situated at the rear of the spraying member and oriented towards the surface 16 so that the angle of incidence a 1 defined above is significant.
  • a suitable operation is observed for an angle of incidence at least approximately equal to 20 °.
  • this value does not constitute an absolute lower limit.
  • the nozzle 28 Independently of the angle of incidence a 1, it is also possible to orient the nozzle 28 so that its jet of cleaning liquid is contained in a plane containing no axis of rotation.
  • the angle a 2 between this plane and the axis x′x is such that the jet of liquid meets the external surface 16 in a slightly oblique fashion and according to the direction of rotation R of the bowl, as is clearly shown in FIGS. 2 and 3.
  • the jet from this nozzle therefore has a speed component in the same direction as that of the bowl.
  • the air blowing means 27 are arranged so that the orifices 27 a are located at a radial distance from the axis of rotation x′x greater than the radial distance at which the nozzle 28 is located.
  • the jet of cleaning liquid from the nozzle 28 is located inside the air envelope created by the air blowing means 27.
  • the cleaning liquid tends to leave the surface 16 but it is returned to the part S2 closest to the edge 17, by the air envelope created by the air blowing means 27.
  • a certain part of the liquid s' escapes into coarse drops of the surface 16.
  • These low spatter are sprayed into droplets much finer by meeting the envelope from air holes 27a and the cleaning air-product mixture is found precipitate on the part S2 of the bowl, thus contributing to its cleaning.
  • the nozzle 28 is located in a vacuum zone due to the proximity of the rotating bowl and the air envelope. If a drop of cleaning product escapes during the application of the coating product, it is picked up by the bowl and sprayed without causing any apparent defect on the object.
  • another cleaning product ejection nozzle 35 is oriented towards the surface of the protrusion 20. It is located inside the space 26, therefore behind the veil 18, but this the latter has a ring of holes 36 made along a circular contour in the vicinity of the base of said protrusion 20.
  • the terminal part of the nozzle 35 is near the web 18 and bent so as to be oriented internally to "aim" at the surface of the protrusion, through the holes 36. In this way, part of the cleaning liquid, not intercepted by the veil, spreads on the surface of the protrusion 20 with a behavior similar to that described above. The incidence is strong, close to 90 °.
  • the cleaning product which is intercepted by the veil makes it possible to clean the two faces 18 a , 18 b of the latter.
  • the liquid which is intercepted by the face 18 a itself (meeting the web between the holes 36) is evacuated by remaining on this rear face and therefore by cleaning it, before crossing the holes 22 and flowing until 'at the discharge edge 17.
  • the cleaning liquid which is intercepted by the side walls of the holes 36 is evacuated essentially by flowing over the front face 18b of the web.
  • the holes in the crown made in the veil are divergent, from back to front relative to the axis x′x of rotation of the bowl.
  • the orientation of the liquid jet remains converging due to the inclination of the nozzle 35.
  • the side of the front face 18 b of the web, the holes 36 open at the bottom of a groove 38 around said prominence 20.
  • This groove and more particularly its outer side wall 38 a which is here frustoconical, serves to homogenize the outlet of cleaning product captured by the holes.
  • each hole 36 can be inclined in a sort of helix and the axis of the jet coming from the nozzle 35 can be oriented so that the speed of the jet has a speed component in the direction of that of the rotary organ.

Landscapes

  • Nozzles (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
EP90402719A 1989-10-03 1990-10-02 Vorrichtung zum Spritzen eines Beschichtungsproduktes mit einem drehenden Sprühelement Expired - Lifetime EP0421866B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912904 1989-10-03
FR8912904A FR2652518B1 (fr) 1989-10-03 1989-10-03 Dispositif de projection de produit de revetement a organe rotatif de pulverisation.

Publications (2)

Publication Number Publication Date
EP0421866A1 true EP0421866A1 (de) 1991-04-10
EP0421866B1 EP0421866B1 (de) 1994-01-12

Family

ID=9386040

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90402719A Expired - Lifetime EP0421866B1 (de) 1989-10-03 1990-10-02 Vorrichtung zum Spritzen eines Beschichtungsproduktes mit einem drehenden Sprühelement

Country Status (5)

Country Link
US (1) US5106025A (de)
EP (1) EP0421866B1 (de)
JP (1) JP2928368B2 (de)
DE (1) DE69005966T2 (de)
FR (1) FR2652518B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715896A3 (de) * 1994-12-07 1997-04-23 Duerr Gmbh & Co Rotationszerstäuber mit einem Glockenkörper
US6327084B1 (en) * 1997-06-30 2001-12-04 Central Glass Company, Limited Display system where polarized light impinges on platelike laminate at brewster's angle or emerges therefrom at angle equal thereto

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2692501B1 (fr) * 1992-06-22 1995-08-04 Sames Sa Dispositif de projection electrostatique de produit de revetement liquide a tete de pulverisation rotative.
DE9321294U1 (de) * 1993-03-04 1997-02-13 Dürr Systems GmbH, 70435 Stuttgart Rotationszerstäuber für eine Beschichtungsvorrichtung
DE19636159A1 (de) * 1996-09-06 1998-03-12 Abb Patent Gmbh Rotationszerstäuber
DE69717416T2 (de) * 1996-10-01 2003-04-03 Alstom Power K.K., Kobe Rotationszerstäubungskopf
KR100265890B1 (ko) * 1996-12-03 2000-09-15 라붸 린도베르 회전무화 헤드형 도장장치
US6053428A (en) * 1997-11-21 2000-04-25 Van Der Steur; Gunnar Rotary atomizer with integrated shaping air
US8141797B2 (en) 2001-01-25 2012-03-27 Durr Systems Inc. Rotary atomizer for particulate paints
US6341734B1 (en) 2000-10-19 2002-01-29 Efc Systems, Inc. Rotary atomizer and bell cup and methods thereof
DE10053296C2 (de) * 2000-10-27 2003-12-18 Eisenmann Lacktechnik Kg Hochrotationszerstäuber zur Aufbringung von Pulverlack
DE10101369A1 (de) * 2001-01-13 2002-07-18 Itw Oberflaechentechnik Gmbh Sprühverfahren und Sprühvorrichtung für Beschichtungsflüssigkeit
DE10101372A1 (de) 2001-01-13 2002-08-01 Itw Oberflaechentechnik Gmbh Sprühverfahren und Sprühvorrichtung für Beschichtungsflüssigkeit
US7762476B2 (en) * 2002-08-19 2010-07-27 Illinois Tool Works Inc. Spray gun with improved atomization
US6808122B2 (en) * 2002-08-19 2004-10-26 Illinois Tool Works, Inc. Spray gun with improved pre-atomization fluid mixing and breakup
DE10342188A1 (de) * 2003-02-27 2004-09-16 Dürr Systems GmbH Glockenteller und Rotationszerstäuber
US20050040257A1 (en) * 2003-08-19 2005-02-24 Seitz David M. Atomizer with dedicated cleaning fluid system
US7762481B2 (en) * 2003-11-06 2010-07-27 Fanuc Robotics America, Inc. Electrostatic rotary atomizer with indirect internal charge
US7926733B2 (en) * 2004-06-30 2011-04-19 Illinois Tool Works Inc. Fluid atomizing system and method
US7883026B2 (en) 2004-06-30 2011-02-08 Illinois Tool Works Inc. Fluid atomizing system and method
DE102005004081A1 (de) * 2005-01-28 2006-08-03 Daimlerchrysler Ag Spülmittelsparender Rotationszerstäuber
US7611069B2 (en) * 2005-08-09 2009-11-03 Fanuc Robotics America, Inc. Apparatus and method for a rotary atomizer with improved pattern control
CA2623131A1 (en) 2006-01-19 2007-07-26 Abb K.K. Rotary spraying head type painting device
FR2915115B1 (fr) * 2007-04-23 2010-09-10 Sames Technologies Organe de pulverisation,dispositif de projection comportant un tel organe,installation de projection et methode de nettoyage d'un tel organe
US8851397B1 (en) 2013-11-14 2014-10-07 Efc Systems, Inc. Bell cup atomizer having improved cleaning capability
US9375734B1 (en) * 2015-06-16 2016-06-28 Efc Systems, Inc. Coating apparatus turbine having internally routed shaping air
FR3087680B1 (fr) * 2018-10-30 2023-02-10 Exel Ind Bol de pulverisation de produit de revetement, projecteur rotatif incluant un tel bol et procede de nettoyage d'un tel projecteur

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4505430A (en) * 1982-11-22 1985-03-19 Ransburg Corporation Self-cleaning atomizer
DE8607841U1 (de) * 1986-03-21 1986-05-15 Behr-Industrieanlagen GmbH & Co, 7121 Ingersheim Vorrichtung zum Vernebeln flüssiger Farbe, insbesondere Lackzerstäuber

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155539A (en) * 1958-11-20 1964-11-03 James W Juvinall Electrostatic spray coating methods and apparatus
US3224680A (en) * 1964-06-11 1965-12-21 Ford Motor Co Atomizing apparatus having a liquid accumulation cavity
DE3000002C2 (de) * 1980-01-02 1985-07-25 Ernst Mueller Gmbh & Co, 7057 Winnenden Elektrostatische Farbspritzpistole mit Rotationszertäuber
GB2142844A (en) * 1983-07-05 1985-01-30 Edward Julius Bals Sprayers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4505430A (en) * 1982-11-22 1985-03-19 Ransburg Corporation Self-cleaning atomizer
DE8607841U1 (de) * 1986-03-21 1986-05-15 Behr-Industrieanlagen GmbH & Co, 7121 Ingersheim Vorrichtung zum Vernebeln flüssiger Farbe, insbesondere Lackzerstäuber

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715896A3 (de) * 1994-12-07 1997-04-23 Duerr Gmbh & Co Rotationszerstäuber mit einem Glockenkörper
US6327084B1 (en) * 1997-06-30 2001-12-04 Central Glass Company, Limited Display system where polarized light impinges on platelike laminate at brewster's angle or emerges therefrom at angle equal thereto
US6507436B2 (en) * 1997-06-30 2003-01-14 Central Glass Company, Limited Display system where polarized light impinges on platelike laminate at brewster's angle or emerges therefrom at angle equal thereto

Also Published As

Publication number Publication date
JP2928368B2 (ja) 1999-08-03
DE69005966D1 (de) 1994-02-24
JPH03151071A (ja) 1991-06-27
EP0421866B1 (de) 1994-01-12
FR2652518A1 (fr) 1991-04-05
US5106025A (en) 1992-04-21
FR2652518B1 (fr) 1994-04-08
DE69005966T2 (de) 1994-05-05

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