EP0307642A2 - Support de pièces à revêtir électrostatiquement - Google Patents

Support de pièces à revêtir électrostatiquement Download PDF

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Publication number
EP0307642A2
EP0307642A2 EP88113414A EP88113414A EP0307642A2 EP 0307642 A2 EP0307642 A2 EP 0307642A2 EP 88113414 A EP88113414 A EP 88113414A EP 88113414 A EP88113414 A EP 88113414A EP 0307642 A2 EP0307642 A2 EP 0307642A2
Authority
EP
European Patent Office
Prior art keywords
workpiece
support body
potential
carrier according
electrically conductive
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.)
Withdrawn
Application number
EP88113414A
Other languages
German (de)
English (en)
Other versions
EP0307642A3 (fr
Inventor
Kurt Dipl.-Ing. Vetter
Rolf Schneider
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.)
Mahle Behr Industry GmbH and Co KG
Original Assignee
Behr Industrieanlagen GmbH and Co KG
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 Behr Industrieanlagen GmbH and Co KG filed Critical Behr Industrieanlagen GmbH and Co KG
Publication of EP0307642A2 publication Critical patent/EP0307642A2/fr
Publication of EP0307642A3 publication Critical patent/EP0307642A3/fr
Withdrawn legal-status Critical Current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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
    • B05B5/084—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects the objects lying on, or being supported above conveying means, e.g. conveyor belts

Definitions

  • the invention relates to a workpiece carrier for electrostatically coating electrically non-conductive, thin-walled workpieces such as plastic bumpers for automobiles, with a support body which is at least approximately matched to the longitudinal and transverse extent, in particular profiles, of the hollow workpiece.
  • workpiece carriers of the aforementioned type are also known, the supporting bodies of which are superficial castings of the inside of the workpieces to be coated, these castings either being made entirely of metal or but made of plastic or ceramic, each with a metal coating.
  • the invention is therefore based on the object of providing a workpiece carrier for inexpensive electrostatic coating of electrically nonconductive thin-walled workpieces which, while avoiding the disadvantages mentioned above, enables an effective counter-potential to be formed to the potential of the imaginary coating device.
  • a workpiece carrier of the type mentioned at the outset in that its support body takes up free edges of the workpiece to be electrostatically coated, so that its cavity is at least largely closed by the support body; and that an electrically conductive potential body is arranged in the cavity obtained on the support body, which at least comes close to the inner surface of the workpiece facing the support body and forms the opposite pole to a coating device located on the outside of the workpiece, which represents the other electrical pole.
  • the workpiece carrier according to the invention can also be used for the electrostatic dedusting of electrically non-conductive thin-walled workpieces.
  • the workpiece carrier can have earth potential or high-voltage potential, while the coating or dedusting device has a high-voltage potential or an opposite high-voltage potential or earth potential.
  • a preferred, first embodiment of the workpiece carrier according to the invention is characterized by an electrically conductive semicircular brush as a potential body, whose galvanically connected Core spans the surface of the support body facing the workpiece and its bristles projecting radially from the core at least come close to the inner surface of the workpiece.
  • Such a brush arrangement results in a potential body which enables optimal electrostatic coating or dust removal if the bristle length is greater than half the brush radius, the bristle thickness depending on the material (e.g.
  • phosphor bronze is of the order of 0.1 mm and the envelope of the free bristle tips in the shape of the Inner surface of the workpiece is as similar as possible, so that the bristle tips are no more than a few millimeters from the inner surface of the workpiece or better still lie there. Optimization also means that the material thickness of the workpiece in the coating or dedusting area is only a few millimeters, and stiffening ribs of the workpiece do not measure more than approximately 10 mm in any direction.
  • the support body of the first embodiment is expediently provided with an electrical sliding contact if the support body is electrically conductive and can be moved along a contact rail.
  • a cavity filling made of metal wool, for example steel wool, is provided as the potential body, which adapts perfectly to the shape of the cavity.
  • resilient metal strip pieces fastened next to one another on the support body are provided as potential bodies, the course of which is adapted to the adjacent inner contour of the workpiece. These pieces of tape can be put together more or less densely and individually give way to any ribs on the inside of the workpiece.
  • a fourth embodiment of the workpiece carrier according to the invention is characterized by an inner mask made of sheet metal sitting on the support body as a potential body, the outer shape of which is adapted to the inner shape of the workpiece, the adjustment not being made by casting the inner surface of the workpiece and by fitting the metal sheet to the cast is to be brought about. It is sufficient if the metal sheet is only a vertical distance of a few millimeters from the inside of the workpiece.
  • the inner mask made of sheet metal has cutouts for receiving the projections, since this potential body is almost rigid.
  • the support body of which may be electrically conductive the surface of the latter is provided with a network of pipelines, of which pocket lines end at nozzles directed against the inner surface of the workpiece and at least one of which is pressurized to a source electrically conductive vapor or mist can be connected, which forms the potential body in the cavity of the workpiece. Since vapor or mist physically represents a gas that effortlessly fills each partial cavity, this relatively complex design of the potential body is also ideally effective.
  • the workpiece carrier according to the invention and in particular its first and fifth embodiment with an electrically conductive support body should be designed so that the support body is provided with bent tabs for receiving free edges of the workpiece, which hold the workpiece securely on the support body without the cavity having to be filled to disrupt the potential body.
  • the workpiece carrier according to the invention which is located below an electrostatic coating device (7), which is indicated by dash-dotted lines in FIG. 1 and has a high-voltage potential with respect to earth, consists of one of the shape of the workpiece (9) - a plastic bumper for automobiles - adapted bow-shaped metallic support body (10), the center below the coating device (7) and the two free ends of which are each rigidly connected to a slide (14) by means of a vertical or inclined electrical insulator (12) which is guided by a horizontally grounded conveyor (16) under the coating device (7); and from a metallic brush (18) which is semicircular in cross section with a wire core (20) which is stretched over the longer center line of the surface (22) of the support body (10) facing the coating device (7) and from which straight bristles (24 ) of the brush (18) protrude radially, the length of which in the inner profile, ie overall, is approximately adapted to the inner surface (26) of the workpiece (9).
  • the fixing tabs are preferably made of metal like the support body (10), one of which the downward-facing insulator-supported ends are provided with a spring-loaded sliding contact (32) which is in constant contact with a contact rail (not shown) running parallel to the conveyor (16).
  • This sliding contact (32) is also and in particular required when the coating device (7) receives earth potential and only the support body (10) should have a high voltage potential.
  • the support body (10) is to be given earth potential when the coating device (7) has high voltage potential, the sliding contact (32) and the insulators (12), which are then to be replaced by metallic supports on the likewise metallic slide (14), are omitted.
  • the workpiece carrier according to the invention differs from the first exemplary embodiment in that, according to FIG. 3, instead of the brush (18) on the supporting body (10) that does not have fixing lugs (30), resilient metal band pieces (34) attached next to one another are provided as potential bodies, the rectangular course of which is adapted to the adjacent inner contour of the workpiece (9) and the free ends of which are optionally on the surface (22) of the supporting body (10) or attached to its underside, for example by riveting.
  • the elastic metal band pieces (34) dodge any ribs on the inside of the workpiece (9).
  • its support body (10) which again has fixing lugs (30), is provided without a sliding contact (32) along its longer center line instead of with the brush core (20) with a pipe (36) on the surface (22).
  • This pipe ( 36) is interrupted by means of cross-shaped quadruple nozzles (38) arranged at equal distances from one another, to which two right-angled pocket lines (40) are connected vertically, as well as at the two ends of the pipeline (36), perpendicular to the surface (22) of the support body (10) projecting sections at the free end are each equipped with a nozzle (42) through which electrically conductive steam or mist (44) can be blown into the cavity formed by the workpiece (9) and support body (10), which can only be applied to the downward-facing ends of the workpiece (9) is open and, if necessary, can be closed there by means of covers.
  • R Ear pipe (36) In its center is the R Ear pipe (36) in fluid-conducting connection with a vertical pipe (46), the lower end of which is provided with a coupling half (48) which can be connected to a second coupling half arranged on the ground or could be replaced by a hose connection.
  • a vertical post (50) On both sides of the tube (46) there is a vertical post (50) on which the support body (10) rests.
  • a stiffening plate (52) stand on a chassis (54) which enables the support body (10) to be offset in parallel as well as the conveyor (16) of the first exemplary embodiment.
  • the connection of the tube (46) to a source of pressurized electrically conductive steam or mist is possible in various ways and is therefore not shown.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP88113414A 1987-09-17 1988-08-18 Support de pièces à revêtir électrostatiquement Withdrawn EP0307642A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8712547U DE8712547U1 (de) 1987-09-17 1987-09-17 Werkstückträger zur elektrostatischen Werkstückbeschichtung
DE8712547U 1987-09-17

Publications (2)

Publication Number Publication Date
EP0307642A2 true EP0307642A2 (fr) 1989-03-22
EP0307642A3 EP0307642A3 (fr) 1990-01-24

Family

ID=6812146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113414A Withdrawn EP0307642A3 (fr) 1987-09-17 1988-08-18 Support de pièces à revêtir électrostatiquement

Country Status (2)

Country Link
EP (1) EP0307642A3 (fr)
DE (1) DE8712547U1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637466A1 (fr) * 1993-08-02 1995-02-08 ITW Gema AG Dispositif de projection électrostatique de produit en poudre
WO1996035516A1 (fr) * 1995-05-09 1996-11-14 Colorcon Limited Revetement electrostatique
GB2316342A (en) * 1995-05-09 1998-02-25 Colorcon Ltd Electrostatic coating
US6783768B1 (en) 1996-11-13 2004-08-31 Phoqus Pharmaceuticals Limited Method and apparatus for the coating of substrates for pharmaceutical use
US7008668B2 (en) 1995-05-09 2006-03-07 Phoqus Pharmaceuticals Limited Powder coating composition for electrostatic coating of pharmaceutical substrates
US7285303B2 (en) 2000-02-01 2007-10-23 Phoqus Pharmaceuticals Limited Powder material for electrostatic application to a substrate and electrostatic application of the powder material to a substrate

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH666630A5 (de) * 1984-07-13 1988-08-15 Praezisions Werkzeuge Ag Verfahren und anordnung zur beschichtung eines koerpers.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637466A1 (fr) * 1993-08-02 1995-02-08 ITW Gema AG Dispositif de projection électrostatique de produit en poudre
WO1996035516A1 (fr) * 1995-05-09 1996-11-14 Colorcon Limited Revetement electrostatique
GB2316342A (en) * 1995-05-09 1998-02-25 Colorcon Ltd Electrostatic coating
GB2316342B (en) * 1995-05-09 2000-01-12 Colorcon Ltd Electrostatic coating
US6117479A (en) * 1995-05-09 2000-09-12 Phoqus Limited Electrostatic coating
US6406738B1 (en) 1995-05-09 2002-06-18 Phoqus Limited Powder coating composition for electrostatic coating of pharmaceutical substrates
US7008668B2 (en) 1995-05-09 2006-03-07 Phoqus Pharmaceuticals Limited Powder coating composition for electrostatic coating of pharmaceutical substrates
US7070656B2 (en) 1995-05-09 2006-07-04 Phoqus Pharmaceuticals Limited Electrostatic coating
US6783768B1 (en) 1996-11-13 2004-08-31 Phoqus Pharmaceuticals Limited Method and apparatus for the coating of substrates for pharmaceutical use
US7153538B2 (en) 1996-11-13 2006-12-26 Phoqus Pharmaceuticals Limited Method and apparatus for the coating of substrates for pharmaceutical use
US7285303B2 (en) 2000-02-01 2007-10-23 Phoqus Pharmaceuticals Limited Powder material for electrostatic application to a substrate and electrostatic application of the powder material to a substrate

Also Published As

Publication number Publication date
EP0307642A3 (fr) 1990-01-24
DE8712547U1 (de) 1987-11-19

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