EP2051814B1 - Device for conveying an electrically conductive and fluid coating material - Google Patents

Device for conveying an electrically conductive and fluid coating material Download PDF

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Publication number
EP2051814B1
EP2051814B1 EP07785993A EP07785993A EP2051814B1 EP 2051814 B1 EP2051814 B1 EP 2051814B1 EP 07785993 A EP07785993 A EP 07785993A EP 07785993 A EP07785993 A EP 07785993A EP 2051814 B1 EP2051814 B1 EP 2051814B1
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EP
European Patent Office
Prior art keywords
electrical resistance
conveying
shaft
conveying means
pump
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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EP07785993A
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German (de)
French (fr)
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EP2051814A1 (en
Inventor
Markus Albrecht
Jan Reichler
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Eisenmann Anlagenbau GmbH and Co KG
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Eisenmann Anlagenbau GmbH and Co KG
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Publication of EP2051814A1 publication Critical patent/EP2051814A1/en
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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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive

Definitions

  • the invention relates to a device for conveying an electrically conductive fluid coating material, in particular a lacquer, to an application device lying at high electrical potential, according to the preamble of claim 1.
  • a device for conveying an electrically conductive fluid coating material, in particular a lacquer, to an application device lying at high electrical potential, according to the preamble of claim 1.
  • Such a device is made EP1319439 known.
  • Such devices find particular in the form of paint pumps in surface technology, such.
  • Example in the automotive industry, application to promote electrically conductive coating material to a working by the electrostatic spraying process application device, in particular an injection molding.
  • the coating material to be sprayed in particular an electrically conductive lacquer, is ionized by means of a high-voltage electrode, which is brought to a high electrical potential via a high-voltage generator. Of the ionized paint is then drawn due to electrostatic forces on the lying generally at approximately ground potential to be coated object, such as a car bodywork.
  • Known devices of the type mentioned above comprise a driven by a drive shaft pump unit, wherein the drive shaft is in turn driven by a motor / gear unit. Since the paint is electrically conductive, the high electrical potential at the high voltage electrode is located within all paint-carrying lines and channels. Some components lying in the interior of the pump unit are flowed around in the operation of the application device of the coating material lying at high electrical potential, whereby the pump unit is brought to the high electrical potential of the high voltage electrode.
  • the motor and / or the gearbox are usually grounded and are at approximately ground potential.
  • the drive shaft and, if necessary, other components associated therewith such as e.g. Couplings, made of electrically non-conductive material, with the aim of ensuring an electrical potential separation between the pump unit and the motor / gear unit.
  • the potential reduction, especially at the pumping unit requires a little more than 15 seconds.
  • This warranty is provided by means of a structurally quite complex monitoring device, which in turn requires a high installation and maintenance.
  • the object of the invention is to provide a device of the type mentioned, in which a rapid potential reduction is ensured on the device, so that additional monitoring is unnecessary, if the device is still at too high electrical potential.
  • an electrical resistance device By this arrangement of an electrical resistance device is a usual potential separation between the conveyors and the drive means to a certain extent. Although the funding is electrically connected to the drive means. However, current flowing from the operating means of the application device at a high electrical potential to the drive means held at approximately ground potential can flow only as a function of the magnitude of the electrical resistance of the electrical resistance device. Thus, with a very large electrical resistance, similar to a complete separation of potential between conveying means and drive means, during operation of the application means, the flow of high currents between conveying means and drive means can be prevented.
  • the electrical resistance device makes it possible for the high electrical potential, on which the conveying means lie, to dissipate relatively quickly.
  • the potential reduction can be done so quickly and access to the device after such a short time safely possible that it is acceptable from a safety point of view to dispense with a complex access control ,
  • an electrical resistance of approximately 10 G ⁇ preferably an electrical resistance between 9.4 G ⁇ and 9.8 G ⁇
  • the electrical resistance device It is particularly advantageous if an electrical resistance of approximately 10 G ⁇ , preferably an electrical resistance between 9.4 G ⁇ and 9.8 G ⁇ , is provided by the electrical resistance device.
  • the potential reduction between the drive means and funding takes place in a period of about 2 seconds, when the high voltage power supply of the application device, which is in the order of 70 kV to 80 kV at 50 uA to 80 uA, is interrupted.
  • the power transmission device comprises the electrical resistance device, wherein it is particularly preferred that the power transmission device comprises a drive shaft with an electrically non-conductive shaft tube, in the interior of which the electrical resistance device is arranged.
  • the power transmission device comprises a drive shaft with an electrically non-conductive shaft tube, in the interior of which the electrical resistance device is arranged.
  • the conveying means comprise a pump unit with a pump shaft, which is connected to the drive shaft of the power transmission device.
  • the electrical resistance device comprises an electrical resistance element, which via a first connection path with the drive means and via a second connection path with the conveying means is electrically connected.
  • Each connection path can be designed, for example, simply in the form of electrically conductive cables with corresponding connections.
  • FIG. 1 is denoted by 10 an application device which operates by the electrostatic spraying method.
  • the application device 10 is connected via a line 12 to the output of a high voltage generator 14; a in FIG. 1 schematically indicated to be coated workpiece 16 is grounded and maintained at ground potential substantially.
  • the application device 10 usually operates with a voltage between 70 kV and 80 kV at a current of 50 ⁇ A to 80 ⁇ A.
  • the application device 10 is fed by means of a generally designated 18 paint pump with an electrically conductive paint, to which it is connected via a hose 20 with an outlet 22 of a pump unit 24 of the paint pump 18.
  • the paint pump 18 sucks via an inlet 26 and an associated hose 28 paint from a paint reservoir 30 and promotes this through the pump unit 24 to the outlet 22.
  • Impeller 34 is provided, wherein the pump chamber 32 is on the one hand via a channel 36 to the inlet 26 of the pump unit 24 and on the other hand via a channel 38 with the outlet 22 in connection.
  • the impeller 34 is driven via a pump shaft 40 which extends through a housing 42 of the pump unit 24 to the outside.
  • the impeller 34 is selected only as a simple example of known per se for pumping means.
  • the paint pump 18 comprises a grounded and thus always substantially at ground potential held motor 44 to which a gear 46 is flanged.
  • the transmission 46 is connected to a drive shaft 48, which transmits the engine power to the pump shaft 40.
  • a first sleeve-shaped hub part 52 of a gear coupling 54 is pushed onto a mounting section 50 of the pump shaft 40 lying outside the housing 42 of the pump unit 24 (see FIG. 2 ).
  • the fixation of the hub portion 52 on the pump shaft 40 takes place in a manner known per se by means of a key 56, which is arranged between the mounting portion 50 of the pump shaft 40 and the inner circumferential surface of the hub portion 52.
  • Grub screw 58 is guided by a radial threaded bore 60 of the hub part 52 and presses against the key 56.
  • the hub part 52 engages engaging in one side of a pocket portion 62 of the gear coupling 54, in the other side of a second sleeve-shaped hub portion 64 engaging seated.
  • the second hub part 64 is mounted on a coupling member 66.
  • the attachment of the coupling member 66 in the hub portion 64 is done in the same manner as the attachment of the pump shaft 40 in the first hub portion 52 of the gear coupling 54.
  • the coupling member 66 carries a circumferential counter-collar 68, wherein between this and that of the second hub portion 64 of the Bogenyakkupplung 54 pioneering end of the coupling member 66, an external thread 70 is provided.
  • a shaft tube 72 is screwed, which for this purpose has an internal thread 74 in a corresponding end region.
  • the shaft tube 72 is screwed onto the coupling member 66 so far that it abuts with its end face against the counter-collar 68 of the coupling member 66.
  • the shaft tube 72 has an internal thread 76 and is thus screwed onto a first hub part 78 of a flange coupling 80.
  • the first hub part 78 has a connecting sleeve 82 which carries an external thread 84 complementary to the internal thread 76 of the shaft tube 72.
  • the connecting sleeve 82 merges integrally into a flange disk 86, against which the shaft tube 72 screwed onto the connecting sleeve 82 abuts.
  • the first hub portion 78 of the flange coupling 80 is bolted to a second hub portion 88 of the flange coupling 80.
  • the second hub part 88 has a flange disc 90, which is suitable for the flange disk 86 of the first hub part 78. This goes into a receiving sleeve 92, in which axially the output shaft of the transmission 46 can be inserted, which is not shown in the figures for clarity.
  • the fixation of the second hub portion 88 of the flange 80 on the shaft of the transmission 46 is again in and known per se Way by means of a feather key and a threaded pin, which is guided by a radial bore in the receiving sleeve 92 of the second hub portion 88 of the flange 80.
  • the feather key, the threaded pin and the radial bore for fixing the second hub part 88 of the flange coupling 80 are not specifically provided with a reference numeral.
  • the inner bore of the ferrule 82 of the first hub portion 78 continues in the flange 86, so that the first hub portion 78 of the flange 80 has a total of an axial through hole 94.
  • the second hub portion 88 of the flange 80 has an axial through hole; this is designated 96.
  • the through-holes 94, 96 of the flange coupling 80 is an electrically conductive contact pin 98 in such a way that it with a first end portion 100 in the through hole 94 of the first hub portion 78 and a second end portion 102 in the through hole 96 of the second hub portion 88 of Flange coupling 80 is located.
  • the second end portion 102 of the contact pin 98 carries a circumferential collar 104 against which abuts a pushed from the side of the first end portion 100 of the contact pin 98 coil spring 106 made of an electrically conductive material.
  • the coil spring 106 extends in the relaxed state beyond the free end of the first end portion 100 of the contact pin 98 addition.
  • the direction away from the contact pin 98 end of the coil spring 106th is applied to a contact element 108, which is screwed into the provided with an internal thread through hole 94 of the first hub portion 78 of the flange 80, from the flange 86 opposite side of the first hub portion 78 ago.
  • the contact element 108 in turn has an externally accessible receptacle 110, in which a plug 112 is seated, which is connected via a running inside the shaft tube 72 line 114 to one end of a resistive element 116, which is located in the interior of the shaft tube 72.
  • the opposite end of the resistance element 116 is connected via a further extending in the interior of the shaft tube 72 line 118 with the coupling member 66 at the flange 80 opposite end of the shaft tube 72.
  • the coupling member 66 Coaxially to its axis, the coupling member 66 on its inside of the gear coupling 54 facing end face on a stepped blind bore 120, in the inner, having the smaller diameter portion, an end portion of an electrically conductive contact pin 122 extends.
  • a section of the contact pin 122 separated from this end section by a radially projecting collar is surrounded by a helical spring 124 made of an electrically conductive material, which has one end on the collar of the contact pin 122 and with the opposite end inside the first hub part 52 of the gear coupling 54 on the end face of the mounting portion 50 of the pump shaft 40 abuts.
  • the shaft tube 72 is made of an electrically non-conductive material.
  • the corrugated tube 72 is filled with an electrically non-conductive filler material, such as a plastic or a resin, which includes the resistive element 116 and the outgoing lines 114 and 118 thereof.
  • Leading the coupling member 66 line 118 in the shaft tube 72 may be connected to the coupling member 66 via a plug in a similar manner as has been described for the line 114 and its connection to the contact element 108.
  • the electrical resistance element 116 is selected to provide an electrical resistance of about 10 G ⁇ , in particular an electrical resistance between 9.4 G ⁇ and 9, 8 G ⁇ .
  • the pump unit 24 is conductively connected to the transmission 46 and above with the motor 44. Due to the high-resistance electrical resistance of the electrical resistance element 116, only a small amount of harmless current can flow from the pump unit 24 which is at high electrical potential during operation of the application device 10 to the motor 44 which is held at approximately ground potential.

Description

Die Erfindung betrifft eine Vorrichtung zum Fördern eines elektrisch leitfähigen fluiden Beschichtungsmaterials, insbesondere eines Lacks, zu einer auf hohem elektrischen Potential liegenden Applikationseinrichtung, gemäß dem Oberbegriff des Anspruchs 1. Eine derartige Vorrichtung ist aus EP1319439 bekannt.The invention relates to a device for conveying an electrically conductive fluid coating material, in particular a lacquer, to an application device lying at high electrical potential, according to the preamble of claim 1. Such a device is made EP1319439 known.

Derartige Vorrichtungen finden insbesondere in Form von Lackpumpen in der Oberflächentechnik, wie z. B. in der Automobilindustrie, Anwendung, um elektrisch leitfähiges Beschichtungsmaterial zu einer nach dem elektrostatischen Spritzverfahren arbeitenden Applikationseinrichtung, insbesondere einer Spritzglocke, zu fördern.Such devices find particular in the form of paint pumps in surface technology, such. Example, in the automotive industry, application to promote electrically conductive coating material to a working by the electrostatic spraying process application device, in particular an injection molding.

Bei elektrostatischen Spritzverfahren wird das zu versprühende Beschichtungsmaterial, insbesondere ein elektrisch leitfähiger Lack, mittels einer Hochspannungselektrode ionisiert, die über einen Hochspannungsgenerator auf ein hohes elektrisches Potential gebracht wird. Der ionisierte Lack wird dann aufgrund elektrostatischer Kräfte auf den im allgemeinen auf annähernd Massepotential liegenden zu beschichtenden Gegenstand, z.B. eine Fahrzeugkakarosserie, gezogen.In electrostatic spraying, the coating material to be sprayed, in particular an electrically conductive lacquer, is ionized by means of a high-voltage electrode, which is brought to a high electrical potential via a high-voltage generator. Of the ionized paint is then drawn due to electrostatic forces on the lying generally at approximately ground potential to be coated object, such as a car bodywork.

Bekannte Vorrichtungen der eingangs genannten Art umfassen eine über eine Antriebswelle angetriebene Pumpeinheit, wobei die Antriebswelle ihrerseits mittels einer Motor/ Getriebe-Einheit angetrieben wird. Da der Lack elektrisch leitfähig ist, liegt das hohe elektrische Potential an der Hochspannungselektrode innerhalb aller lackführender Leitungen und Kanäle an. Einige im Innern der Pumpeinheit liegende Bauteile werden im Betrieb der Applikationseinrichtung von dem auf hohem elektrischen Potential liegenden Beschichtungsmaterial umströmt, wodurch auch die Pumpeinheit auf das hohe elektrischen Potential der Hochspannungselektrode gebracht wird.Known devices of the type mentioned above comprise a driven by a drive shaft pump unit, wherein the drive shaft is in turn driven by a motor / gear unit. Since the paint is electrically conductive, the high electrical potential at the high voltage electrode is located within all paint-carrying lines and channels. Some components lying in the interior of the pump unit are flowed around in the operation of the application device of the coating material lying at high electrical potential, whereby the pump unit is brought to the high electrical potential of the high voltage electrode.

Der Motor und/oder das Getriebe sind üblicherweise geerdet und liegen auf annähernd Massepotential. Um einen ein Gefahrenpotential aufweisenden Fluß hoher Ströme von der Pumpeinheit in Richtung auf die Motor/Getriebe-Einheit zu verhindern, sind die Antriebswelle und gegebenenfalls weitere zu dieser gehörende Bauteile, wie z.B. Kupplungen, aus elektrisch nicht leitendem Material hergestellt, mit dem Ziel, eine elektrische Potentialtrennung zwischen der Pumpeinheit und der Motor/Getriebe-Einheit zu gewährleisten.The motor and / or the gearbox are usually grounded and are at approximately ground potential. In order to prevent a potential flow of high currents from the pumping unit towards the motor / gear unit, the drive shaft and, if necessary, other components associated therewith, such as e.g. Couplings, made of electrically non-conductive material, with the aim of ensuring an electrical potential separation between the pump unit and the motor / gear unit.

Zwar ist so ein unerwünschter Stromfluß zwischen der Pumpeinheit und dem Motor unterbunden. Ein anderes Problem ergibt sich jedoch daraus, daß es verhältnismäßig lange dauert, bis das hohe elektrische Potential, welches an der Pumpeinheit anliegt, abgebaut ist, wenn der Applikationsvorgang beendet ist und die Applikationseinrichtung nicht mehr mit Hochspannung beaufschlagt wird. Dies birgt Gefahren für Personen, welche den Bereich im Umkreis der Pumpeinheit betreten müssen, beispielsweise um Wartungsarbeiten durchzuführen, falls diese Personen nicht ausreichend lange warten, bis das hohe Potential abgebaut ist.Although such an undesirable flow of current between the pump unit and the engine is prevented. Another problem arises, however, from the fact that it takes a relatively long time until the high electrical potential applied to the pump unit is degraded when the application process is completed and the application device is no longer subjected to high voltage. This poses a risk for persons who have to enter the area in the vicinity of the pumping unit, for example to carry out maintenance work, if these persons do not wait long enough for the high potential to be reduced.

In der Regel benötigt bisher der Potentialabbau insbesondere an der Pumpeinheit etwas mehr als 15 Sekunden. Aus sicherheitstechnischen Gründen muß daher gewährleistet sein, daß der Zutritt einer Person zu einem Bereich in der Nähe der Applikationseinrichtung bzw. der Pumpeinheit nur dann freigegeben wird, wenn keine Gefahr mehr vorliegt und die Pumpeinheit auf annähernd Massepotential liegt. Diese Gewährleistung erfolgt mittels einer baulich recht komplexen Überwachungseinrichtung, die ihrerseits einen hohen Installations- und Wartungsaufwand erfordert.As a rule, the potential reduction, especially at the pumping unit, requires a little more than 15 seconds. For safety reasons, it must therefore be ensured that the access of a person to an area in the vicinity of the application device or the pump unit is only released when there is no longer any danger and the pump unit is at approximately ground potential. This warranty is provided by means of a structurally quite complex monitoring device, which in turn requires a high installation and maintenance.

Aufgabe der Erfindung ist es, eine Vorrichtung der eingangs genannten Art zu schaffen, bei welcher ein rascher Potentialabbau an der Vorrichtung sichergestellt ist, so daß eine zusätzliche Überwachung entbehrlich ist, ob die Vorrichtung noch auf zu hohem elektrischen Potential liegt.The object of the invention is to provide a device of the type mentioned, in which a rapid potential reduction is ensured on the device, so that additional monitoring is unnecessary, if the device is still at too high electrical potential.

Diese Ausgabe wird bei einer Vorrichtung der eingangs genannten Art durch die Merkmale des Anspruchs 1 gelöst.This output is achieved in a device of the type mentioned by the features of claim 1.

Durch diese Anordnung einer elektrischen Widerstandseinrichtung ist eine sonst übliche Potentialtrennung zwischen den Fördermitteln und den Antriebsmitteln bis zu einem gewissen Grad aufgehoben. Die Fördermittel sind zwar elektrisch leitend mit den Antriebsmitteln verbunden. Von den im Betrieb der Applikationseinrichtung auf hohem elektrischen Potential liegenden Fördermitteln hin zu den auf annähernd Massepotential gehaltenen Antriebsmitteln kann Strom jedoch nur in Abhängigkeit von der Größe des elektrischen Widerstandes der elektrischen Widerstandseinrichtung fließen. Somit kann mit einem sehr großen elektrischen Widerstand, ähnlich wie bei einer vollständigen Potentialtrennung zwischen Fördermitteln und Antriebsmitteln, im Betrieb der Applikationseinrichtung der Fluß hoher Ströme zwischen Fördermitteln und Antriebsmitteln unterbunden werden.By this arrangement of an electrical resistance device is a usual potential separation between the conveyors and the drive means to a certain extent. Although the funding is electrically connected to the drive means. However, current flowing from the operating means of the application device at a high electrical potential to the drive means held at approximately ground potential can flow only as a function of the magnitude of the electrical resistance of the electrical resistance device. Thus, with a very large electrical resistance, similar to a complete separation of potential between conveying means and drive means, during operation of the application means, the flow of high currents between conveying means and drive means can be prevented.

Gleichzeitig ermöglicht es die elektrische Widerstandseinrichtung, wenn die Hochspannungsversorgung der Applikationseinrichtung unterbrochen wird, dass das hohe elektrische Potential, auf welchem die Fördermittel liegen, relativ schnell abgebaut wird. Abhängig von der Größe des elektrischen Widerstands, den die elektrische Widerstandseinrichtung bereitstellt, kann der Potentialabbau derart schnell erfolgen und ein Zutritt eines Menschen zur Vorrichtung nach einer derart kurzen Zeit gefahrlos möglich sein, daß es aus sicherheitstechnischer Sicht vertretbar ist, auf eine aufwendige Zutrittsüberwachung zu verzichten.At the same time, when the high-voltage supply of the application device is interrupted, the electrical resistance device makes it possible for the high electrical potential, on which the conveying means lie, to dissipate relatively quickly. Depending on the size of the electrical resistance, which provides the electrical resistance device, the potential reduction can be done so quickly and access to the device after such a short time safely possible that it is acceptable from a safety point of view to dispense with a complex access control ,

Vorteilhafte Ausbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.Advantageous embodiments of the invention are specified in the dependent claims.

Es ist insbesondere vorteilhaft, wenn durch die elektrische Widerstandseinrichtung ein elektrischer Widerstand von etwa 10 GΩ, bevorzugt ein elektrischer Widerstand zwischen 9,4 GΩ und 9,8 GΩ, bereitgestellt ist. Auf diese Weise fließt zwischen Fördermitteln und Antriebsmitteln im Betrieb der Applikationseinrichtung nur ein sehr geringer Strom. Darüber hinaus erfolgt der Potentialabbau zwischen Antriebsmittel und Fördermitteln in einem Zeitraum von etwa 2 Sekunden, wenn die Hochspannungsversorgung der Applikationseinrichtung, die in der Größenordnung von 70 kV bis 80 kV bei 50 µA bis 80 µA liegt, unterbrochen wird. Um jegliche Gefahr eines Stromschlages für einen Menschen zu beseitigen, ist es dann beispielsweise ausreichend, den Zugangsweg zu den Fördermitteln mit einfachen technischen Mitteln so auszugestalten, daß diese Zeit überbrückt wird.It is particularly advantageous if an electrical resistance of approximately 10 GΩ, preferably an electrical resistance between 9.4 GΩ and 9.8 GΩ, is provided by the electrical resistance device. In this way flows between conveyor and drive means in Operation of the application device only a very low power. In addition, the potential reduction between the drive means and funding takes place in a period of about 2 seconds, when the high voltage power supply of the application device, which is in the order of 70 kV to 80 kV at 50 uA to 80 uA, is interrupted. To eliminate any risk of electric shock to a person, it is then sufficient, for example, to design the access route to the conveying means with simple technical means in such a way that this time is bridged.

Es ist günstig, wenn die Kraftübertragungseinrichtung die elektrische Widerstandseinrichtung umfaßt, wobei es insbesondere bevorzugt ist, daß die Kraftübertragungseinrichtung eine Antriebswelle mit einem elektrisch nicht leitfähigen Wellenrohr umfaßt, in dessen Innerem die elektrische Widerstandseinrichtung angeordnet ist. Auf diese Weise kann eine bisher üblicherweise schon verwendete hohle Antriebswelle aus elektrisch nicht leitfähigem Material weiterverwendet und mit der elektrischen Widerstandseinrichtung nachgerüstet werden.It is favorable if the power transmission device comprises the electrical resistance device, wherein it is particularly preferred that the power transmission device comprises a drive shaft with an electrically non-conductive shaft tube, in the interior of which the electrical resistance device is arranged. In this way, a hitherto usually used hollow drive shaft made of electrically non-conductive material can be reused and retrofitted with the electrical resistance device.

Aus technischer Sicht ist es grundsätzlich hilfreich, wenn an und für sich bekannte Bauteile verwendet werden können. Daher ist es vorteilhaft, wenn die Fördermittel eine Pumpeinheit mit einer Pumpenwelle umfassen, welche mit der Antriebswelle der Kraftübertragungseinrichtung verbunden ist.From a technical point of view, it is generally helpful if components known per se can be used. Therefore, it is advantageous if the conveying means comprise a pump unit with a pump shaft, which is connected to the drive shaft of the power transmission device.

Eine technisch relativ einfache Ausbildung der elektrischen Widerstandseinrichtung ist möglich, wenn die elektrische Widerstandseinrichtung ein elektrisches Widerstandselement umfaßt, welches über einen ersten Verbindungsweg mit den Antriebsmitteln und über einen zweiten Verbindungsweg mit den Fördermitteln elektrisch verbunden ist. Jeder Verbindungsweg kann dabei beispielsweise einfach in Form von elektrisch leitenden Kabeln mit entsprechenden Anschlüssen ausgebildet sein.A technically relatively simple design of the electrical resistance device is possible if the electrical resistance device comprises an electrical resistance element, which via a first connection path with the drive means and via a second connection path with the conveying means is electrically connected. Each connection path can be designed, for example, simply in the form of electrically conductive cables with corresponding connections.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. In dieser zeigen:

Figur 1
schematisch eine Anlage zum elektrostatischen Lackieren mit einer Förderpumpe, deren Antriebswelle im axialen Schnitt gezeigt ist; und
Figur 2
die Antriebswelle von Figur 1 in vergrößertem Maßstab, wobei sie um ihre Drehachse um 180° verdreht ist.
An embodiment of the invention will be explained in more detail with reference to the drawing. In this show:
FIG. 1
schematically a plant for electrostatic painting with a feed pump whose drive shaft is shown in axial section; and
FIG. 2
the drive shaft of FIG. 1 on an enlarged scale, where it is rotated about its axis of rotation by 180 °.

In Figur 1 ist mit 10 ein Applikationseinrichtung bezeichnet, welche nach dem elektrostatischen Spritzverfahren arbeitet. Dazu ist die Applikationseinrichtung 10 über eine Leitung 12 mit dem Ausgang eines Hochspannungsgenerators 14 verbunden; ein in Figur 1 schematisch angedeutetes zu beschichtendes Werkstück 16 ist geerdet und im wesentlichen auf Massepotential gehalten. Die Applikationseinrichtung 10 arbeitet üblicherweise mit einer Spannung zwischen 70 kV und 80 kV bei einer Stromstärke von 50 µA bis 80 µA.In FIG. 1 is denoted by 10 an application device which operates by the electrostatic spraying method. For this purpose, the application device 10 is connected via a line 12 to the output of a high voltage generator 14; a in FIG. 1 schematically indicated to be coated workpiece 16 is grounded and maintained at ground potential substantially. The application device 10 usually operates with a voltage between 70 kV and 80 kV at a current of 50 μA to 80 μA.

Die Applikationseinrichtung 10 wird mittels einer insgesamt mit 18 bezeichneten Lackpumpe mit einem elektrisch leitfähigen Lack gespeist, wozu sie über einen Schlauch 20 mit einem Auslaß 22 einer Pumpeinheit 24 der Lackpumpe 18 verbunden ist. Die Lackpumpe 18 saugt über einen Einlaß 26 und einen damit verbundenen Schlauch 28 Lack aus einem Lackreservoir 30 an und fördert diesen durch die Pumpeinheit 24 zu deren Auslaß 22. Dazu ist im Inneren der Pumpeinheit 24 ein in einem Pumpenraum 32 drehbar gelagertes Flügelrad 34 vorgesehen, wobei der Pumpenraum 32 einerseits über einen Kanal 36 mit dem Einlaß 26 der Pumpeneinheit 24 und andererseits über einen Kanal 38 mit deren Auslaß 22 in Verbindung steht. Das Flügelrad 34 wird über eine Pumpenwelle 40 angetrieben, welche sich durch ein Gehäuse 42 der Pumpeinheit 24 nach außen erstreckt.The application device 10 is fed by means of a generally designated 18 paint pump with an electrically conductive paint, to which it is connected via a hose 20 with an outlet 22 of a pump unit 24 of the paint pump 18. The paint pump 18 sucks via an inlet 26 and an associated hose 28 paint from a paint reservoir 30 and promotes this through the pump unit 24 to the outlet 22. For this purpose, in the interior of the pump unit 24 is rotatably mounted in a pump chamber 32 Impeller 34 is provided, wherein the pump chamber 32 is on the one hand via a channel 36 to the inlet 26 of the pump unit 24 and on the other hand via a channel 38 with the outlet 22 in connection. The impeller 34 is driven via a pump shaft 40 which extends through a housing 42 of the pump unit 24 to the outside.

Die in Figur 1 dargestellten, im Inneren ihres Gehäuses 42 liegenden Komponenten der Pumpeinheit 24 sind mit gestrichelten Linien angedeutet, wobei das Flügelrad 34 nur als ein einfaches Beispiel für an und für sich bekannte Pumpmittel gewählt ist.In the FIG. 1 shown, lying in the interior of its housing 42 components of the pump unit 24 are indicated by dashed lines, the impeller 34 is selected only as a simple example of known per se for pumping means.

Die Lackpumpe 18 umfaßt einen geerdeten und so stets im wesentlichen auf Massepotential gehaltenen Motor 44, an den ein Getriebe 46 angeflanscht ist. Das Getriebe 46 ist mit einer Antriebswelle 48 verbunden, welche die Motorkraft auf die Pumpenwelle 40 überträgt.The paint pump 18 comprises a grounded and thus always substantially at ground potential held motor 44 to which a gear 46 is flanged. The transmission 46 is connected to a drive shaft 48, which transmits the engine power to the pump shaft 40.

Dazu ist auf einen außerhalb des Gehäuses 42 der Pumpeinheit 24 liegenden Befestigungsabschnitt 50 der Pumpenwelle 40 ein erstes hülsenförmiges Nabenteil 52 einer Bogenzahnkupplung 54 aufgeschoben (siehe Figur 2). Die Fixierung des Nabenteils 52 an der Pumpenwelle 40 erfolgt in an und für sich bekannter Weise mittels einer Paßfeder 56, welche zwischen dem Befestigungsabschnitt 50 der Pumpenwelle 40 und der Innenmantelfläche des Nabenteils 52 angeordnet ist. Gewindestift 58 ist durch eine radiale Gewindebohrung 60 des Nabenteils 52 geführt und drückt gegen die Paßfeder 56.For this purpose, a first sleeve-shaped hub part 52 of a gear coupling 54 is pushed onto a mounting section 50 of the pump shaft 40 lying outside the housing 42 of the pump unit 24 (see FIG FIG. 2 ). The fixation of the hub portion 52 on the pump shaft 40 takes place in a manner known per se by means of a key 56, which is arranged between the mounting portion 50 of the pump shaft 40 and the inner circumferential surface of the hub portion 52. Grub screw 58 is guided by a radial threaded bore 60 of the hub part 52 and presses against the key 56.

Das Nabenteil 52 sitzt eingreifend in einer Seite eines Taschenteils 62 der Bogenzahnkupplung 54, in dessen anderer Seite ein zweites hülsenförmiges Nabenteil 64 eingreifend einsitzt. Das zweite Nabenteil 64 ist auf ein Kupplungsglied 66 aufgesetzt. Die Befestigung des Kupplungsgliedes 66 in dem Nabenteil 64 geschieht auf die gleiche Weise, wie die Befestigung der Pumpenwelle 40 in dem ersten Nabenteil 52 der Bogenzahnkupplung 54. Das Kupplungsglied 66 trägt einen umlaufenden Konterkragen 68, wobei zwischen diesem und dem von dem zweiten Nabenteil 64 der Bogenzahnkupplung 54 wegweisenden Ende des Kupplungsgliedes 66 ein Außengewinde 70 vorgesehen ist. Auf dieses ist ein Wellenrohr 72 aufgeschraubt, welches dazu in einem entsprechenden Endbereich ein Innengewinde 74 aufweist. Das Wellenrohr 72 ist so weit auf das Kupplungsglied 66 aufgeschraubt, daß es mit seiner Stirnseite gegen den Konterkragen 68 des Kupplungsgliedes 66 anliegt.The hub part 52 engages engaging in one side of a pocket portion 62 of the gear coupling 54, in the other side of a second sleeve-shaped hub portion 64 engaging seated. The second hub part 64 is mounted on a coupling member 66. The attachment of the coupling member 66 in the hub portion 64 is done in the same manner as the attachment of the pump shaft 40 in the first hub portion 52 of the gear coupling 54. The coupling member 66 carries a circumferential counter-collar 68, wherein between this and that of the second hub portion 64 of the Bogenzahnkupplung 54 pioneering end of the coupling member 66, an external thread 70 is provided. On this, a shaft tube 72 is screwed, which for this purpose has an internal thread 74 in a corresponding end region. The shaft tube 72 is screwed onto the coupling member 66 so far that it abuts with its end face against the counter-collar 68 of the coupling member 66.

In dem dem Kupplungsglied 66 gegenüberliegenden Endbereich weist das Wellenrohr 72 ein Innengewinde 76 auf und ist damit auf ein erstes Nabenteil 78 einer Flanschkupplung 80 aufgeschraubt. Hierzu weist das erste Nabenteil 78 eine Anschlußhülse 82 auf, welche ein zum Innengewinde 76 des Wellenrohres 72 komplementäres Außengewinde 84 trägt. Die Anschlußhülse 82 geht einstückig in eine Flanschscheibe 86 über, gegen die das auf die Anschlußhülse 82 aufgeschraubte Wellenrohr 72 anliegt.In the end region opposite the coupling member 66, the shaft tube 72 has an internal thread 76 and is thus screwed onto a first hub part 78 of a flange coupling 80. For this purpose, the first hub part 78 has a connecting sleeve 82 which carries an external thread 84 complementary to the internal thread 76 of the shaft tube 72. The connecting sleeve 82 merges integrally into a flange disk 86, against which the shaft tube 72 screwed onto the connecting sleeve 82 abuts.

Das erste Nabenteil 78 der Flanschkupplung 80 ist mit einem zweiten Nabenteil 88 der Flanschkupplung 80 verschraubt. Hierzu weist das zweite Nabenteil 88 eine zur Flanschscheibe 86 des ersten Nabenteils 78 passende Flanschscheibe 90 auf. Diese geht in eine Aufnahmehülse 92 über, in welcher axial die Ausgangswelle des Getriebes 46 eingeschoben werden kann, welche der Übersichtlichkeit halber in den Figuren nicht gezeigt ist. Die Fixierung des zweiten Nabenteils 88 der Flanschkupplung 80 auf der Welle des Getriebes 46 erfolgt wieder in an und für sich bekannter Weise mittels einer Paßfeder und eines Gewindestifts, welcher durch eine radiale Bohrung in der Aufnahmehülse 92 des zweiten Nabenteils 88 der Flanschkupplung 80 geführt ist. Die Paßfeder, der Gewindestift und die radiale Bohrung zur Fixierung des zweiten Nabenteils 88 der Flanschkupplung 80 sind nicht eigens mit einem Bezugszeichen versehen.The first hub portion 78 of the flange coupling 80 is bolted to a second hub portion 88 of the flange coupling 80. For this purpose, the second hub part 88 has a flange disc 90, which is suitable for the flange disk 86 of the first hub part 78. This goes into a receiving sleeve 92, in which axially the output shaft of the transmission 46 can be inserted, which is not shown in the figures for clarity. The fixation of the second hub portion 88 of the flange 80 on the shaft of the transmission 46 is again in and known per se Way by means of a feather key and a threaded pin, which is guided by a radial bore in the receiving sleeve 92 of the second hub portion 88 of the flange 80. The feather key, the threaded pin and the radial bore for fixing the second hub part 88 of the flange coupling 80 are not specifically provided with a reference numeral.

Wie insbesondere in Figur 2 zu erkennen ist, setzt sich die Innenbohrung der Anschlußhülse 82 des ersten Nabenteils 78 in dessen Flanschscheibe 86 fort, so daß das erste Nabenteil 78 der Flanschkupplung 80 insgesamt eine axiale Durchgangsbohrung 94 aufweist. In entsprechender Weise hat auch das zweite Nabenteil 88 der Flanschkupplung 80 eine axiale Durchgangsbohrung; diese ist mit 96 bezeichnet. Bei aneinander befestigten Nabenteilen 78 und 88 der Flanschkupplung 80 verlaufen die Durchgangsbohrung 94 des ersten Nabenteils 78 und die Durchgangsbohrung 96 des zweiten Nabenteils 88 koaxial zueinander.As in particular in FIG. 2 can be seen, the inner bore of the ferrule 82 of the first hub portion 78 continues in the flange 86, so that the first hub portion 78 of the flange 80 has a total of an axial through hole 94. Similarly, the second hub portion 88 of the flange 80 has an axial through hole; this is designated 96. With hub portions 78 and 88 of the flange coupling 80 secured together, the throughbore 94 of the first hub portion 78 and the throughbore 96 of the second hub portion 88 are coaxial with one another.

In den Durchgangsbohrungen 94, 96 der Flanschkupplung 80 liegt ein elektrisch leitender Kontaktstift 98 in der Weise ein, daß er mit einem ersten Endbereich 100 in der Durchgangsbohrung 94 des ersten Nabenteils 78 und mit einem zweiten Endbereich 102 in der Durchgangsbohrung 96 des zweiten Nabenteils 88 der Flanschkupplung 80 liegt.In the through-holes 94, 96 of the flange coupling 80 is an electrically conductive contact pin 98 in such a way that it with a first end portion 100 in the through hole 94 of the first hub portion 78 and a second end portion 102 in the through hole 96 of the second hub portion 88 of Flange coupling 80 is located.

Der zweite Endbereich 102 des Kontaktstifts 98 trägt einen umlaufenden Kragen 104, gegen den eine von der Seite des ersten Endbereichs 100 des Kontaktstifts 98 aufgeschobene Schraubenfeder 106 aus einem elektrisch leitfähigen Material anliegt. Die Schraubenfeder 106 erstreckt sich im entspannten Zustand über das freie Ende des ersten Endbereichs 100 des Kontaktstifts 98 hinaus. Das von dem Kontaktstift 98 wegweisende Ende der Schraubenfeder 106 liegt an einem Kontaktelement 108 an, welches in die dazu mit einem Innengewinde versehene Durchgangsbohrung 94 des ersten Nabenteils 78 der Flanschkupplung 80 eingeschraubt ist, und zwar von der der Flanschscheibe 86 gegenüberliegenden Seite des ersten Nabenteils 78 her. Das Kontaktelement 108 seinerseits weist eine von außen zugängliche Aufnahme 110 auf, in welcher ein Stecker 112 sitzt, der über eine im Inneren des Wellenrohrs 72 verlaufende Leitung 114 mit einem Ende eines Widerstandselements 116 verbunden ist, welches sich im Inneren des Wellenrohrs 72 befindet. Das gegenüberliegende Ende des Widerstandselements 116 ist über eine weitere im Inneren des Wellenrohrs 72 verlaufende Leitung 118 mit dem Kupplungsglied 66 an dem der Flanschkupplung 80 gegenüberliegenden Ende des Wellenrohrs 72 verbunden.The second end portion 102 of the contact pin 98 carries a circumferential collar 104 against which abuts a pushed from the side of the first end portion 100 of the contact pin 98 coil spring 106 made of an electrically conductive material. The coil spring 106 extends in the relaxed state beyond the free end of the first end portion 100 of the contact pin 98 addition. The direction away from the contact pin 98 end of the coil spring 106th is applied to a contact element 108, which is screwed into the provided with an internal thread through hole 94 of the first hub portion 78 of the flange 80, from the flange 86 opposite side of the first hub portion 78 ago. The contact element 108 in turn has an externally accessible receptacle 110, in which a plug 112 is seated, which is connected via a running inside the shaft tube 72 line 114 to one end of a resistive element 116, which is located in the interior of the shaft tube 72. The opposite end of the resistance element 116 is connected via a further extending in the interior of the shaft tube 72 line 118 with the coupling member 66 at the flange 80 opposite end of the shaft tube 72.

Koaxial zu seiner Achse weist das Kupplungsglied 66 auf seiner ins Innere der Bogenzahnkupplung 54 weisenden Stirnfläche eine gestufte Sackbohrung 120 auf, in deren innenliegendem, den kleineren Durchmesser aufweisenden, Abschnitt ein Endabschnitt eines elektrisch leitenden Kontaktstifts 122 verläuft. Ein von diesem Endabschnitt durch einen radial überstehenden Bund getrennter Abschnitt des Kontaktstifts 122 ist von einer Schraubenfeder 124 aus einem elektrisch leitfähigen Material umgeben, die mit einem Ende an dem Bund des Kontaktstifts 122 und mit dem gegenüberliegenden Ende im Inneren des ersten Nabenteils 52 der Bogenzahnkupplung 54 an der Stirnfläche des Befestigungsabschnitts 50 der Pumpenwelle 40 anliegt.Coaxially to its axis, the coupling member 66 on its inside of the gear coupling 54 facing end face on a stepped blind bore 120, in the inner, having the smaller diameter portion, an end portion of an electrically conductive contact pin 122 extends. A section of the contact pin 122 separated from this end section by a radially projecting collar is surrounded by a helical spring 124 made of an electrically conductive material, which has one end on the collar of the contact pin 122 and with the opposite end inside the first hub part 52 of the gear coupling 54 on the end face of the mounting portion 50 of the pump shaft 40 abuts.

Durch die federbeaufschlagten Kontaktstifte 98 und 122 ist gewährleistet, daß bei einer Bewegung der Komponenten der Bogenzahnkupplung 54 in axialer Richtung die elektrisch leitende Verbindung zwischen der Pumpeinheit 24 bzw. deren Pumpenwelle 40 und dem Getriebe 46 bzw. dem Motor 44 über das Widerstandselement 116 stets aufrechterhalten wird.By the spring-loaded contact pins 98 and 122 it is ensured that in a movement of the components of the curved tooth coupling 54 in the axial direction, the electrically conductive connection between the pump unit 24 and the pump shaft 40 and the gear 46 and the motor 44th is always maintained via the resistance element 116.

Von den zwischen dem Getriebe 46 und der Pumpeinheit 24 vorliegenden Bauteilen der Antriebswelle 48 ist wenigstens das Wellenrohr 72 aus einem elektrisch nicht leitfähigen Material hergestellt. Darüber hinaus ist das Wellenrohr 72 mit einem elektrisch nicht leitenden Füllmaterial, wie beispielsweise einem Kunststoff oder einem Harz, gefüllt, welches das Widerstandselement 116 und die von diesem ausgehenden Leitungen 114 und 118 einschließt. Die zum Kupplungsglied 66 führende Leitung 118 im Wellenrohr 72 kann mit dem Kupplungsglied 66 über einen Stecker in ähnlicher Weise verbunden sein, wie dies für die Leitung 114 und deren Verbindung zum Kontaktelement 108 beschrieben wurde.Of the present between the gear 46 and the pump unit 24 components of the drive shaft 48 at least the shaft tube 72 is made of an electrically non-conductive material. In addition, the corrugated tube 72 is filled with an electrically non-conductive filler material, such as a plastic or a resin, which includes the resistive element 116 and the outgoing lines 114 and 118 thereof. Leading the coupling member 66 line 118 in the shaft tube 72 may be connected to the coupling member 66 via a plug in a similar manner as has been described for the line 114 and its connection to the contact element 108.

Das elektrische Widerstandselement 116 ist so ausgewählt, daß es einen elektrischen Widerstand von etwa 10 GΩ, insbesondere einen elektrischen Widerstand zwischen 9,4 GΩ und 9, 8 GΩ, bereitstellt.The electrical resistance element 116 is selected to provide an electrical resistance of about 10 GΩ, in particular an electrical resistance between 9.4 GΩ and 9, 8 GΩ.

Über das elektrische Widerstandselement 116 ist die Pumpeinheit 24 leitend mit dem Getriebe 46 und darüber mit dem Motor 44 verbunden. Aufgrund des hochohmigen elektrischen Widerstands des elektrischen Widerstandselements 116 kann von der im Betrieb der Applikationseinrichtung 10 auf hohem elektrischen Potential liegenden Pumpeinheit 24 hin zu den auf annähernd Massepotential gehaltenen Motor 44 nur ein ungefährlicher geringer Strom fließen.About the electrical resistance element 116, the pump unit 24 is conductively connected to the transmission 46 and above with the motor 44. Due to the high-resistance electrical resistance of the electrical resistance element 116, only a small amount of harmless current can flow from the pump unit 24 which is at high electrical potential during operation of the application device 10 to the motor 44 which is held at approximately ground potential.

Wenn die Hochspannungsversorgung der Applikationseinrichtung 10 durch den Hochspannungsgenerator 14 unterbrochen wird, wird das hohe elektrische Potential, welches an der Pumpeinheit 24 anliegt, relativ schnell über den auf annähernd Massepotential gehaltenen Motor 44 abgebaut.When the high-voltage supply of the application device 10 is interrupted by the high-voltage generator 14, the high electrical potential which is applied to the pump unit 24 is reduced relatively quickly via the motor 44 held at approximately ground potential.

Claims (6)

  1. Apparatus for conveying an electrically conductive, fluid coating material, in particular a lacquer, to an application device at high electrical potential, with
    a) drive means (44, 46) which are capable of being connected to earth potential;
    b) conveying means (24) which are capable of being driven by the drive means (44, 46) and by means of which the coating material is capable of being conveyed to the application device (10);
    c) a power-transmission device (54, 48, 80), via which the drive means (44, 46) for driving the conveying means (24) are coupled with the conveying means (24);
    d) an electrical resistance device (116) which is in contact with the drive means (44) and with the conveying means (24), characterised in that the resistance device (116) provides the single electrically conducting connection between the conveying means (24) and the drive means (44, 46).
  2. Apparatus according to Claim 1, characterised in that an electrical resistance of approximately 10 GΩ, preferably an electrical resistance between 9.4 GΩ and 9.8 GΩ, is provided by the electrical resistance device (116).
  3. Apparatus according to Claim 1 or 2, characterised in that the power-transmission device (54, 48, 80) includes the electrical resistance device (116).
  4. Apparatus according to Claim 3, characterised in that the power-transmission device (46, 48) includes a drive shaft (48) with an electrically non-conductive shaft tube (72), in the interior of which the electrical resistance device (116) is arranged.
  5. Apparatus according to Claim 4, characterised in that the conveying means (24) include a pump unit (24) with a pump shaft (40) which is connected to the drive shaft (48) of the power-transmission device (54, 48, 80).
  6. Apparatus according to one of Claims 1 to 5, characterised in that the electrical resistance device (116) includes an electrical resistance element (116) which is electronically connected to the drive means (44) via a first connection path (114, 108, 98, 46) and to the conveying means (24) via a second connection path (118, 66, 122).
EP07785993A 2006-08-17 2007-07-11 Device for conveying an electrically conductive and fluid coating material Expired - Fee Related EP2051814B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006038563A DE102006038563A1 (en) 2006-08-17 2006-08-17 Device for conveying an electrically conductive fluid coating material
PCT/EP2007/006134 WO2008019736A1 (en) 2006-08-17 2007-07-11 Device for conveying an electrically conductive and fluid coating material

Publications (2)

Publication Number Publication Date
EP2051814A1 EP2051814A1 (en) 2009-04-29
EP2051814B1 true EP2051814B1 (en) 2009-11-25

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EP07785993A Expired - Fee Related EP2051814B1 (en) 2006-08-17 2007-07-11 Device for conveying an electrically conductive and fluid coating material

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EP (1) EP2051814B1 (en)
DE (2) DE102006038563A1 (en)
NO (1) NO20091136L (en)
WO (1) WO2008019736A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012001563B4 (en) * 2012-01-27 2019-05-09 Dürr Systems Ag Paint booth with a coating agent line and corresponding production method for the coating agent line
CN103433162A (en) * 2013-08-22 2013-12-11 深圳市远东盛业科技有限公司 Water-based paint electrostatic system
DE102022115557A1 (en) 2022-06-22 2023-12-28 Prominent Gmbh Potential equalization for a dosing pump

Family Cites Families (8)

* 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
FR1275476A (en) * 1960-09-20 1961-11-10 Method and device for electrostatic paint application
US3145930A (en) * 1961-01-05 1964-08-25 Metallgesellschaft Ag Electrostatic paint spraying apparatus for changing liquids
DE3717929A1 (en) * 1987-05-27 1988-12-08 Behr Industrieanlagen Process and system for electrostatic coating with conductive material
DE4433113C2 (en) * 1994-09-16 1998-12-17 Wagner Int Device for charging and dispensing electrically conductive spray material
DE10161550A1 (en) * 2001-12-14 2003-06-18 Duerr Systems Gmbh Sensor arrangement for a part of a coating system which is at high voltage potential
EP1360996B1 (en) * 2002-05-07 2006-01-04 Dürr Systems GmbH Method and apparatus for delivering and applying an electrically conductive paint
DE10233633B4 (en) * 2002-07-24 2005-09-01 Dürr Systems GmbH Device for dosing or conveying a high-voltage potential charged coating agent in a coating system

Also Published As

Publication number Publication date
EP2051814A1 (en) 2009-04-29
DE502007002125D1 (en) 2010-01-07
NO20091136L (en) 2009-03-16
WO2008019736A1 (en) 2008-02-21
DE102006038563A1 (en) 2008-04-30

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