EP0307642A2 - Work piece support for electrostatic coating - Google Patents

Work piece support for electrostatic coating 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Withdrawn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)
French (fr)
Other versions
EP0307642A3 (en
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/en
Publication of EP0307642A3 publication Critical patent/EP0307642A3/en
Withdrawn legal-status Critical Current

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    • 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.

Abstract

In order to avoid, in a workpiece carrier for the electrostatic coating of electrically non-conductive thin-walled workpieces with a support body matched to the longitudinal and transverse extension of the hollow workpiece unnecessary coating costs as a result of high material expenditure and time expenditure for the production of different electrically conductive support bodies completely matched to the workpieces and for changing the said bodies during the workpiece change-over and to permit an opposite potential from the potential of the envisaged coating device to be formed, it is proposed for the sake of cost to design and develop the workpiece carrier in such a way that the support body (10) receives free edges of the workpiece (9) so that its hollow space is enclosed at least to the largest possible extent by the support body; and that an electrically conductive potential body (18; 34) is at least close to the support body (10) in the obtained hollow space and forms the corresponding pole to an electrostatic coating or dedusting device (7) located on the outside of the workpiece since the workpiece carrier according to the invention can also be used for the electrostatic dedusting of workpieces of the aforesaid type. One and the same support body can now be used for different variants of a basic form of a specific workpiece because the new potential body matches itself to the shape of the hollow space receiving it between the support body and workpiece. In the final analysis, this contributes to higher productivity in series coating. <IMAGE>

Description

Die Erfindung betrifft einen Werkstückträger zur elektrostatischen Beschichtung elektrisch nichtleitender, dünnwandiger Werkstücke wie Kunststoffstoßfänger für Automobile, mit einem der Längs- und Quererstreckung, insbesondere Profilen, des hohlen Werkstückes wenigstens ungefähr angepaßten Stützkörper.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.

Statt einer vorbereitenden Beschichtung des Werkstückes in der Weise, daß dessen elektrostatisch zu beschichtende Oberfläche elektrisch leitfähig wird, sind auch Werkstückträger der zuvor genannten Art bekannt, deren Stützkörper oberflächlich Abgüsse der Innenseiten der zu beschichtenden Werkstücke sind, wobei diese Abgüsse entweder ganz aus Metall bestehen oder aber aus Kunststoff oder Keramik je mit Metallüberzug.Instead of a preparatory coating of the workpiece in such a way that its surface to be electrostatically coated becomes electrically conductive, 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.

Aus verfahrenstechnischen Gründen wird die Verwendung eines Leitlackes zur Vorbeschichtung des Werkstückes wo möglich vermieden. Auch die Verwendung von den Werkstücken völlig angepaßten elektrisch leitenden Stützkörpern ist nachteilig, weil dadurch ein hoher Material- und Zeitaufwand zur Erzeugung der verschiedenen Stützkörper entsteht, die bei einem Werkstückwechsel ebenfalls ausgewechselt werden müssen, was einen Zeitverlust mit sich bringt und erhebliche körperliche Arbeit erfordert. - Durch diese Nachteile steigen die Beschichtungskosten wesentlich an.For procedural reasons, the use of a conductive lacquer for precoating the workpiece is avoided where possible. The use of fully adapted electrically conductive support bodies is also disadvantageous because this results in a high expenditure of material and time for the production of the various support bodies, which also have to be replaced when changing the workpiece, which results in a loss of time and requires considerable physical work. - Due to these disadvantages, the coating costs increase significantly.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Werkstückträger zur kostengünstigen elektrostatischen Beschichtung elektrisch nichtleitender dünnwandiger Werkstücke zu schaffen, welcher unter Vermeidung der zuvor erwähnten Nachteile ein wirksames Gegenpotential zum Potential der gedachten Beschichtungseinrichtung zu bilden ermöglicht.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.

Diese Aufgabe ist bei einem Werkstückträger der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß sein Stützkörper freie Ränder des elektrostatisch zu beschichtenden Werkstückes aufnimmt, sodaß dessen Hohlraum durch den Stützkörper mindestens größtenteils geschlossen ist; und daß in dem erhaltenen Hohlraum auf dem Stützkörper ein elektrisch leitender Potentialkörper angeordnet ist, welcher der dem Stützkörper zugewandten Innenfläche des Werkstückes zumindest nahekommt und den Gegenpol zu einer auf der Außenseite des Werkstückes befindlichen Beschichtungseinrichtung bildet, die den anderen elektrischen Pol darstellt.This object is achieved according to the invention in 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.

Dadurch wird vorteilhafterweise erreicht, daß ein und derselbe Stützkörper für verschiedene Varianten einer Grundform des Werkstückes verwendbar ist, weil der in dem Hohlraum, der zwischen Stützkörper und Werkstück gebildet ist, zwischen diesen angeordnete Potentialkörper sich der Gestalt des Hohlraumes von selbst anpaßt. Die Beschichtungskosten lassen sich deshalb beträchtlich niedriger als bisher halten. Bei einer Serienbeschichtung ergibt sich eine wesentlich erhöhte Produktivität.This advantageously ensures that one and the same support body can be used for different variants of a basic shape of the workpiece, because the potential body arranged between them in the cavity, which is formed between the support body and the workpiece, adapts itself to the shape of the cavity. The coating costs can therefore be kept considerably lower than before. A series coating results in a significantly increased productivity.

Offensichtlich läßt sich der erfindungsgemäße Werkstückträger auch zur elektrostatischen Entstaubung elektrisch nichtleitender dünnwandiger Werkstücke verwenden.Obviously, the workpiece carrier according to the invention can also be used for the electrostatic dedusting of electrically non-conductive thin-walled workpieces.

Wie bisher kann der Werkstückträger Erdpotential oder Hochspannungspotential aufweisen, während die Beschichtungs- oder Entstaubungseinrichtung ein Hochspannungspotential bzw. ein entgegengesetztes Hochspannungspotential oder Erdpotential aufweist.As before, 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.

Eine bevorzugte, erste Ausführungsform des erfindungsgemäßen Werkstückträgers zeichnet sich durch eine elektrisch leitende halbrunde Bürste als Potentialkörper aus, deren galvanisch angeschlossene Seele die dem Werkstück zugewandte Oberfläche des Stützkörpers überspannt und deren radial von der Seele abstehende Borsten der Innenfläche des Werkstückes wenigstens nahekommen. Eine solche Bürstenanordnung ergibt einen Potentialkörper, der eine optimale elektrostatische Beschichtung oder Entstaubung ermöglicht, falls die Borstenlänge größer ist als der halbe Bürstenradius, die vom Werkstoff (z.B. Phosphorbronze) abhängige Borstenstärke größenordnungsmäßig 0,1 mm beträgt und die Einhüllende der freien Borstenspitzen der Form der Innenfläche des Werkstückes so ähnlich wie möglich ist, sodaß die Borstenspitzen nicht mehr als wenige Millimeter von der Innenfläche des Werkstückes entfernt sind oder besser noch dort anliegen. Zur Optimierung gehört auch, daß die Materialstärke des Werkstückes im Beschichtungs- oder Entstaubungsbereich nur wenige Millimeter beträgt und Versteifungsrippen des Werkstückes in keiner Richtung mehr als ungefähr 10 mm messen.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.

Der Stützkörper der ersten Ausführungsform ist zweckmäßig mit einem elektrischen Schleifkontakt versehen, falls der Stützkörper elektrisch leitend und einer Kontaktschiene entlang bewegbar ist.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.

Bei einer zweiten Ausführungsform des erfindungsgemäßen Werkstückträgers ist als Potentialkörper eine Hohlraumfüllung aus Metallwolle, beispielsweise Stahlwolle, vorgesehen, die sich der Hohlraumform vorzüglich anpaßt.In a second embodiment of the workpiece carrier according to the invention, 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.

Bei einer dritten Ausführungsform des erfindungsgemäßen Werkstückträgers sind als Potentialkörper nebeneinander an dem Stützkörper befestigte federnde Metallbandstücke vorgesehen, deren Verlauf der benachbarten Innenkontur des Werkstückes angepaßt ist. Diese Bandstücke können mehr oder weniger dicht zusammengesetzt werden und weichen einzeln eventuellen Rippen auf der Innenseite des Werkstückes elastisch aus.In a third embodiment of the workpiece carrier according to the invention, 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.

Eine vierte Ausführungsform des erfindungsgemäßen Werkstückträgers zeichnet sich durch eine auf dem Stützkörper sitzende Innenmaske aus Metallblech als Potentialkörper aus, deren Außenform der Innenform des Werkstückes angepaßt ist, wobei die Anpassung nicht durch einen Abguß der Innenfläche des Werkstückes und durch eine Anschmiegung des Metallbleches an den Abguß herbeizuführen ist. Es genügt, wenn das Metallblech von der Innenfläche des Werkstückes überall nur einen senkrechten Abstand von einigen Millimetern hält.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.

Für ein Werkstück mit versteifenden Vorsprüngen auf seiner Innenseite, bei denen es sich im allgemeinen um Rippen handeln wird, weist die Innenmaske aus Metallblech Aussparungen zur Aufnahme der Vorsprünge auf, da dieser Potentialkörper nahezu steif ist.For a workpiece with stiffening projections on its inside, which will generally be ribs, the inner mask made of sheet metal has cutouts for receiving the projections, since this potential body is almost rigid.

Bei einer fünften Ausführungsform des erfindungsgemäßen Werkstückträgers, deren Stützkörper gegebenenfalls elektrisch leitend ist, ist dieser an seiner Oberfläche mit einem Netz von Rohrleitungen versehen, von denen Sackleitungen an gegen die Innenfläche des Werkstückes gerichteten Düsen enden und von denen mindestens eine an eine Quelle unter Druck stehenden elektrisch leitfähigen Dampfes oder Nebels anschließbar ist, der im Hohlraum des Werkstückes den Potentialkörper bildet. Da Dampf oder Nebel physikalisch gesehen ein Gas darstellen, das jeden Teilhohlraum mühelos füllt, ist diese relativ aufwendige Ausgestaltung des Potentialkörpers zugleich von idealer Wirksamkeit.In a fifth embodiment of the workpiece carrier according to the invention, 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.

Der erfindungsgemäße Werkstückträger und insbesondere seine erste und fünfte Ausführungsform mit elektrisch leitendem Stützkörper sollte so ausgeführt werden, daß der Stützkörper mit abgebogenen Laschen zur Aufnahme von freien Rändern des Werkstückes versehen ist, welche das Werkstück sicher auf dem Stützkörper halten, ohne die Erfüllung des Hohlraumes durch den Potentialkörper zu stören.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.

Im folgenden ist die Erfindung anhand der durch die Zeichnung beispielhaft dargestellten Ausführungsformen des erfindungsgemäßen Werkstückträgers im einzelnen erläutert. Es zeigt:

  • Fig 1 eine Seitenansicht der ersten Ausführungsform;
  • Fig. 2 einen Schnitt nach der Linie II-II in Fig. 1 durch die erste Ausführungsform;
  • Fig. 3 eine abgebrochen dargestellte perspektivische Ansicht der dritten Ausführungsform;
  • Fig 4 eine schematisch dargestellte perspektivische Ansicht der fünften Ausführungsform in Verbindung mit einer Fördereinrichtung; und
  • Fig 5 einen Ausschnitt aus Fig. 4 mit einer perspektivisch dargestellten Einzelheit der fünften Ausführungsform.
The invention is explained in detail below with reference to the embodiments of the workpiece carrier according to the invention, which are illustrated by way of example in the drawing. It shows:
  • 1 shows a side view of the first embodiment;
  • Figure 2 is a section along the line II-II in Figure 1 through the first embodiment.
  • 3 is a broken perspective view of the third embodiment;
  • 4 shows a schematically represented perspective view of the fifth embodiment in connection with a conveyor device; and
  • 5 shows a detail from FIG. 4 with a detail of the fifth embodiment shown in perspective.

Im ersten Ausführungsbeispiel besteht der erfindungsgemäße Werkstückträger, der sich unter einer in Fig. 1 mit strichpunktierten Linien angedeuteten, nach unten Lack zerstäubenden elektrostatischen Beschichtungseinrichtung (7) befindet, die gegenüber Erde ein Hochspannungspotential aufweist, gemäß Fig 1 und 2 aus einem der Gestalt des Werkstückes (9) - einem Kunststoffstoßfänger für Automobile - angepaßten bügelförmigen metallischen Stützkörper (10), dessen Zentrum unterhalb der Beschichtungseinrichtung (7) und dessen beide freie Enden je mittels eines vertikalen bzw. schräg liegenden Elektro­Isolators (12) mit einem Schlitten (14) starr verbunden sind, der von einem waagrechten geerdeten Förderer (16) unter der Beschichtungseinrichtung (7) hindurchgeführt wird; und aus einer im Querschnitt halbrunden metallischen Bürste (18) mit einer Drahtseele (20), die längs der längeren Mittellinie der der Beschichtungseinrichtung (7) zugewandten Oberfläche (22) des Stützkörpers (10) über diesen gespannt ist und von welcher gerade Borsten (24) der Bürste (18) radial abstehen, deren Länge im Innenprofil, d.h. insgesamt,der Innenfläche (26) des Werkstückes (9) ungefähr angepaßt ist. - Zur vorübergehenden Halterung des Werkstückes (9) am Stützkörper (10) weist dieser zur Aufnahme des vorderen und des hinteren Flansches (28) des Werkstückes Fixierlaschen (30) auf, die an der Innenfläche (26) des Werkstückes (9) im Bereich von dessen Flanschen (28) reibschlüssig angreifen. Damit die Entfernung der Borsten (24) von der Innenfläche (26) des Werkstückes (9) durch die Fixierlaschen (30) am Stützkörper (10) von diesen überbrückt wird, bestehen die Fixierlaschen vorzugsweise aus Metall wie der Stützkörper (10), dessen eines der nach unten gerichteten isolatorgestützten Enden mit einem gefederten Schleifkontakt (32) versehen ist, der mit einer parallel zum Förderer (16) verlaufenden, nicht dargestellten Kontaktschiene ständig in Berührung steht. Dieser Schleifkontakt (32) wird auch und insbesondere dann benötigt, wenn die Beschichtungseinrichtung (7) Erdpotential erhält und nur der Stützkörper (10) ein Hochspannungspotential aufweisen soll.In the first exemplary embodiment, 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). - For temporarily holding the workpiece (9) on the support body (10), this has fixing tabs (30) for receiving the front and rear flange (28) of the workpiece, which on the inner surface (26) of the workpiece (9) in the range from grip its flanges (28) by friction. So that the removal of the bristles (24) from the inner surface (26) of the workpiece (9) is bridged by the fixing tabs (30) on the support body (10), 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.

Falls der Stützkörper (10) bei Hochspannungspotential aufweisender Beschichtungseinrichtung (7) Erdpotential erhalten soll, entfallen der Schleifkontakt (32) und die Isolatoren (12), die dann durch metallische Stützen auf dem ebenfalls metallischen Schlitten (14) zu ersetzen sind.If 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.

Im dritten Ausführungsbeispiel unterscheidet sich der erfindungsgemäße Werkstückträger dadurch vom ersten Ausführungsbeispiel, daß gemäß Fig. 3 statt der Bürste (18) auf dem ohne Fixierlaschen (30) auskommenden Stützkörper (10) als Potentialkörper nebeneinander befestigte federnde Metallbandstücke (34) vorgesehen sind, deren rechteckiger Verlauf der benachbarten Innenkontur des Werkstückes (9) angepaßt ist und deren freie Enden wahlweise auf der Oberfläche (22) des Stützkörpers (10) oder auf dessen Unterseite befestigt sind, beispielsweise durch Annieten. Die elastischen Metallbandstücke (34) weichen eventuellen Rippen an der Innenseite des Werkstückes (9) aus.In the third exemplary embodiment, 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).

Im fünften Ausführungsbeispiel des erfindungsgemäßen Werkstückträgers ist dessen wieder Fixierlaschen (30) aufweisender Stützkörper (10) ohne Schleifkontakt (32) längs seiner längeren Mittellinie anstatt mit der Bürstenseele (20) mit einer Rohrleitung (36) auf der Oberfläche (22) versehen Diese Rohrleitung (36) ist mittels in gleichen Abständen voneinander angeordneten kreuzförmigen Vierfachstutzen (38) unterbrochen, an die ebenso wie an den beiden Enden der Rohrleitung (36) je zwei rechtwinklige Sackleitungen (40) senkrecht angeschlossen sind, deren senkrecht von der Oberfläche (22) des Stützkörpers (10) abstehende Abschnitte am freien Ende mit je einer Düse (42) besetzt sind, durch die elektrisch leitender Dampf oder Nebel (44) in den von Werkstück (9) und Stützkörper (10) gebildeten Hohlraum eingeblasen werden kann, welcher nur an den nach unten weisenden Enden des Werkstückes (9) offen ist und dort erforderlichenfalls mittels Deckeln geschlossen sein kann In ihrer Mitte steht die Rohrleitung (36) in fluidleitender Verbindung mit einem vertikälen Rohr (46), dessen unteres Ende mit einer Kupplungshälfte (48) versehen ist, die mit einer am Erdboden angeordneten zweiten Kupplungshälfte verbindbar ist oder durch einen Schlauchanschluß ersetzt sein könnte. Auf beiden Seiten des Rohres (46) befindet sich je ein vertikaler Pfosten (50), auf dem der Stützkörper (10) ruht.In the fifth exemplary embodiment of the workpiece carrier according to the invention, 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. 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. On both sides of the tube (46) there is a vertical post (50) on which the support body (10) rests.

Die miteinander und mit dem Rohr (46) mittels eines Versteifungsbleches (52) verbundenen beiden Pfosten (50) stehen auf einem Fahrgestell (54), das einen Parallelversatz des Stützkörpers (10) ebenso ermöglicht wie der Förderer (16) des ersten Ausführungsbeispieles. - Der Anschluß des Rohres (46) an eine Quelle unter Druck stehenden elektrisch leitfähigen Dampfes oder Nebels ist auf verschiedene Weise möglich und deshalb nicht dargestellt.The two posts (50) connected to each other and to the tube (46) by means of 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.

Claims (9)

1.) Werkstückträger zur elektrostatischen Beschichtung oder Enstaubung elektrisch nichtleitender, dünnwandiger Werkstücke wie Kunststoffstoßfänger (9) für Automobile, mit einem der Längs- und Quererstreckung, insbesondere Profilen, des hohlen Werkstückes (9) wenigstens ungefähr angepaßten Stützkörper (10), dadurch gekennzeichnet, daß der Stützkörper (10) freie Ränder des Werkstückes (9) aufnimmt, sodaß dessen Hohlraum durch den Stützkörper mindestens größtenteils geschlossen ist; und daß in dem erhaltenen Hohlraum auf dem Stützkörper (10) ein elektrisch leitender Potentialkörper (18; 34; 44) angeordnet ist, welcher der dem Stützkörper zugewandten Innenfläche (26) des Werkstückes (9) zumindest nahekommt und den Gegenpol zu einer auf der Außenseite des Werkstückes befindlichen elektrostatischen Beschichtungs- oder Entstaubungseinrichtung (7) bildet.1.) Workpiece carrier for electrostatic coating or dedusting of electrically non-conductive, thin-walled workpieces such as plastic bumpers (9) for automobiles, with a support body (10) at least approximately matched to the longitudinal and transverse extension, in particular profiles, of the hollow workpiece (9), characterized in that that the support body (10) receives free edges of the workpiece (9) so that its cavity is at least largely closed by the support body; and that an electrically conductive potential body (18; 34; 44) is arranged in the cavity obtained on the support body (10), which at least approximates the inner surface (26) of the workpiece (9) facing the support body and the opposite pole to one on the outside of the workpiece located electrostatic coating or dedusting device (7) forms. 2.) Werkstückträger nach Anspruch 1, gekennzeichnet durch eine elektrisch leitende halbrunde Bürste (18) als Potentialkörper, deren galvanisch angeschlossene Seele (20) die dem Werkstück (9) zugewandte Oberfläche (22) des Stützkörpers (10) überspannt und deren radial von der Seele abstehende Borsten (24) der Innenfläche (26) des Werkstückes wenigstens nahekommen (Fig. 2).2.) workpiece holder according to claim 1, characterized by an electrically conductive semicircular brush (18) as a potential body, the galvanically connected core (20) spans the workpiece (9) facing surface (22) of the support body (10) and the radial of which Bristles (24) protruding from the inner surface (26) of the workpiece at least come close (Fig. 2). 3.) Werkstückträger nach Anspruch 1 oder 2, dessen Stützkörper elektrisch leitend ist, dadurch gekennzeichnet, daß der Stützkörper (10) mit einem elektrischen Schleifkontakt (32) versehen ist (Fig. 1).3.) Workpiece carrier according to claim 1 or 2, the support body is electrically conductive, characterized in that the support body (10) is provided with an electrical sliding contact (32) (Fig. 1). 4.) Werkstückträger nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß als Potentialkörper eine Hohlraumfüllung aus Metallwolle vorgesehen ist.4.) Workpiece carrier according to claim 1 or 3, characterized in that a cavity filling made of metal wool is provided as the potential body. 5.) Werkstückträger nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß als Potentialkörper nebeneinander an dem Stützkörper (10) befestigte federnde Metallbandstücke (34) vorgesehen sind, deren Verlauf der benachbarten Innenkontur des Werkstückes (9) angepaßt ist (Fig. 3).5.) Workpiece carrier according to claim 1 or 3, characterized in that resilient metal band pieces (34) are provided as potential bodies next to each other on the support body (10), the course of which is adapted to the adjacent inner contour of the workpiece (9) (Fig. 3). 6.) Werkstückträger nach Anspruch 1 oder 3, gekennzeichnet durch eine auf dem Stützkörper sitzende Innenmaske aus Metallblech als Potentialkörper, deren Außenform der Innenform des Werkstückes angepaßt ist.6.) Workpiece carrier according to claim 1 or 3, characterized by an inner mask on the supporting body made of sheet metal as a potential body, the outer shape of which is adapted to the inner shape of the workpiece. 7.) Werkstückträger nach Anspruch 6, für ein Werkstück mit versteifenden Vorsprüngen auf seiner Innenseite, dadurch gekennzeichnet, daß die Innenmaske Aussparungen zur Aufnahme der Vorsprünge aufweist.7.) workpiece carrier according to claim 6, for a workpiece with stiffening projections on its inside, characterized in that the inner mask has recesses for receiving the projections. 8.) Werkstückträger nach Anspruch 1, dessen Stützkörper (10) gegebenenfalls elektrisch leitend ist, dadurch gekennzeichnet, daß der Stützkörper (10) an seiner Oberfläche (22) mit einem Netz von Rohrleitungen (36, 40) versehen ist, von denen Sackleitungen (40) an gegen die Innenfläche (26) des Werkstückes (9) gerichteten Düsen (42) enden und von denen mindestens eine (36) an eine Quelle unter Druck stehenden elektrisch leitfähigen Dampfes oder Nebels anschließbar ist, der im Hohlraum des Werkstückes den Potentialkörper bildet (Fig. 4, 5).8.) Workpiece carrier according to claim 1, whose support body (10) is optionally electrically conductive, characterized in that the support body (10) is provided on its surface (22) with a network of pipes (36, 40), of which pocket lines ( 40) end at nozzles (42) directed against the inner surface (26) of the workpiece (9) and at least one (36) of which can be connected to a source of pressurized electrically conductive vapor or mist which forms the potential body in the cavity of the workpiece (Fig. 4, 5). 9.) Werkstückträger nach Anspruch 3 oder 8, dadurch gekennzeichnet, daß der Stützkörper (10) mit abgebogenen Laschen (30), vorzugsweise aus Metall, zur Aufnahme von freien Rändern (28) des Werkstückes (9) versehen ist9.) workpiece carrier according to claim 3 or 8, characterized in that the support body (10) with bent tabs (30), preferably made of metal, is provided for receiving free edges (28) of the workpiece (9)
EP88113414A 1987-09-17 1988-08-18 Work piece support for electrostatic coating Withdrawn EP0307642A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8712547U 1987-09-17
DE8712547U DE8712547U1 (en) 1987-09-17 1987-09-17

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EP0307642A2 true EP0307642A2 (en) 1989-03-22
EP0307642A3 EP0307642A3 (en) 1990-01-24

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637466A1 (en) * 1993-08-02 1995-02-08 ITW Gema AG Device for the electrostatic spraying of powdery products
WO1996035516A1 (en) * 1995-05-09 1996-11-14 Colorcon Limited Electrostatic coating
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH666630A5 (en) * 1984-07-13 1988-08-15 Praezisions Werkzeuge Ag METHOD AND ARRANGEMENT FOR COATING A BODY.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH666630A5 (en) * 1984-07-13 1988-08-15 Praezisions Werkzeuge Ag METHOD AND ARRANGEMENT FOR COATING A BODY.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0637466A1 (en) * 1993-08-02 1995-02-08 ITW Gema AG Device for the electrostatic spraying of powdery products
WO1996035516A1 (en) * 1995-05-09 1996-11-14 Colorcon Limited Electrostatic coating
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 (en) 1990-01-24
DE8712547U1 (en) 1987-11-19

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