EP0525303B1 - Device for feeding a powder coating apparatus with a mixture of air and powder - Google Patents

Device for feeding a powder coating apparatus with a mixture of air and powder Download PDF

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Publication number
EP0525303B1
EP0525303B1 EP92106291A EP92106291A EP0525303B1 EP 0525303 B1 EP0525303 B1 EP 0525303B1 EP 92106291 A EP92106291 A EP 92106291A EP 92106291 A EP92106291 A EP 92106291A EP 0525303 B1 EP0525303 B1 EP 0525303B1
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Prior art keywords
powder
air
dosing
container
air mixture
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EP92106291A
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German (de)
French (fr)
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EP0525303A1 (en
EP0525303B2 (en
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Radovan Dipl.-Ing. Talacko
Maximilian Matt
Horst Dr. Adams
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Wagner International AG
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Wagner International AG
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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
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material

Definitions

  • the invention relates to a device for feeding a powder-air mixture to a powder coating device according to the preamble of claim 1.
  • the applicators i.e. the powder spray guns
  • the powder spray guns must be supplied with the powder in the form of a powder-air mixture, with the most uniform possible distribution and precise and constant metering of the powder particles in the powder-air flow being of particular importance for uniform coating.
  • the coating powder is usually prepared in special storage containers.
  • These storage containers have a fluidizing and conveying device.
  • a storage container is known from DE-PS 36 11 039.
  • With the type of fluidizing and conveying device described there it is difficult to carry out an exact conveying and metering. This disadvantage is exacerbated by generally long delivery lines from the generally very large powder storage container to the remote powder coating device.
  • the object of the present invention is therefore to provide a device for dining on a powder coating device, with the aid of which it is possible to significantly improve conveying uniformity and metering accuracy and, independently of one another, with respect to the throughput quantity and air fraction of the powder-air mixture, from a single storage container to supply.
  • An advantage of the solutions according to the invention can be seen in the fact that by separating the air from the incoming powder-air mixture, fluidizing and metering the remaining powder in a metering container assigned to a single powder coating device, the composition and volume of the powder-air stream of the desired coating quality can be adapted, despite the fact that only a single reservoir is provided for several powder coating devices. It is essential for the dosing accuracy that the fluidizing air is first excreted from the powder-air mixture arriving from the storage container, and that the remaining powder is then fluidized and dosed again in a defined manner.
  • Another advantage of the invention results from the relatively short conveying path from the metering container - which can be accommodated in a small design in close proximity to the coating device - to the associated powder coating device, as a result of which the conveying uniformity is significantly less impaired than with conventional long conveying lines.
  • the use of a dosing container enables the operation of a powder coating device assigned to it, even when the storage container is not conveying, at least for a certain period of time which is dependent on the volume of the dosing container.
  • FIG. 1 shows a schematic illustration of the device with a storage container 1, delivery lines 2 and 4, a metering container 3 and a powder coating device 5.
  • a storage container 1 shows a schematic illustration of the device with a storage container 1, delivery lines 2 and 4, a metering container 3 and a powder coating device 5.
  • FIG. 1 shows a schematic illustration of the device with a storage container 1, delivery lines 2 and 4, a metering container 3 and a powder coating device 5.
  • the conveying line 4 from the metering container to the powder coating device is generally short compared to the conveying line 2 from the storage container 1 to the metering container 3.
  • the centerpiece of the device for feeding a powder-air mixture to a powder coating device is the dosing container 3 shown in FIGS. 2 to 4.
  • FIGS. 2 to 4 show different views of the dosing container with devices for
  • a cyclone 15 is accommodated in the container lid 14, with a horizontal feed 16 for the powder-air mixture coming from the storage container and an upper opening 17, which forms a connection to the atmosphere, for discharging the air components of the powder-air mixture.
  • the dosing container 3 also has a powder chamber 20 with a lower powder outlet 28, which is covered by a cover bell 29.
  • the bottom of the powder chamber 20 is formed by the fluidizing device 11, which comprises a fluidizing bottom 31 with fluidizing air inlet 32 on its underside. Below this fluidizing device there is a metering chamber 34 with a metering air inlet 35 on the side, in the interior of which a fine-pored, gas-permeable metering cartridge 36 is accommodated.
  • the dosing chamber is followed by the conveying device 13, which has an injector 38 with injector air inlet 39 and outlet 40 for the dosed powder-air mixture to the associated powder coating device.
  • a powder level indicator 21 is provided, which in the exemplary embodiment is designed as a pneumatic height monitor with a pressure tube 22 and an orifice 23 in the cross section of this tube, at its lower free end.
  • the dosing container 3 is provided with brackets 25, 26 in order to be able to fasten it in the vicinity of the workplace, for example on a cabin wall.
  • the device described works as follows:
  • the powder-air mixture coming from the storage container 1 flows tangentially into the cyclone 15. This creates a primary vortex on the inner cyclone wall, through which the heavy powder particles are separated downwards under the influence of centrifugal acceleration, while the light air particles are carried upwards in a narrow, rising secondary vortex and excreted through the opening 17.
  • the powder is subsequently collected in the powder chamber 20 and fluidized by the fluidizing air flowing through the fluidizing tray 31.
  • the powder-air mixture generated is drawn off by the suction effect of the injector 38 through the powder outlet 28.
  • the powder-air mixture flows through the metering chamber 34 along the metering cartridge 36, through whose fine-pored, gas-permeable wall further air can be added to the powder-air mixture via the metering air inlet 35; that is, the powder-air mixture can be further "diluted".
  • the conveying air entering through the injector air inlet 39 determines the conveyed quantity of the powder-air mixture to the associated powder coating device, and the powder-air flow is conveyed in a known manner to the neighboring coating device.
  • the powder fill level in the powder chamber 20 is indicated by the powder fill level indicator 21.
  • the fill level is detected by the orifice 23 in the end of the pressure tube 22 in accordance with the weight force of the powder acting on it.
  • the delivery of the powder-air mixture from the storage container 1 to the dosing container 3 can be regulated according to the calculated differences from the measured height and height limit values with predetermined values for the minimum and maximum filling height and on the basis of the measured powder filling level.
  • the sequence of first fluidizing powder remaining after the air has been discharged and then metering the powder-air mixture produced can be reversed by arranging the metering device 12 appropriately after the separating device 10 and before the fluidizing device 11. This arrangement results in a particularly exact dosage for certain applications.
  • the powder level indicator 21 in the powder chamber 20 can also be capacitive, inductive, mechanical or optoelectrical by means of a transparent container cylinder.
  • the metered powder-air mixture can also be conveyed mechanically to the assigned powder coating device by means of a screw, cell wheel or the like.
  • the metering container 3 is connected directly to the powder coating device without an intermediate feed line 4. This is particularly useful for permanently installed coating devices. In this case it is also possible to accommodate the high voltage generator of the electrostatic powder coating device in or on the dosing container 3.
  • all components of the dosing container can be connected to one another by plugging or screwing.

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  • Coating Apparatus (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Cyclones (AREA)
  • Nozzles (AREA)

Description

Die Erfindung betrifft eine Einrichtung zum Speisen eines Pulver-Luft-Gemisches zu einem Pulverbeschichtungsgerät nach dem oberbegriff des Patentanspruchs 1.The invention relates to a device for feeding a powder-air mixture to a powder coating device according to the preamble of claim 1.

Bei elektrostatischen Pulverbeschichtungsgeräten muß den Applikatoren, also den Pulversprühpistolen, das Pulver in Form eines Pulver-Luft-Gemisches zugeführt werden, wobei eine möglichst gleichmäßige Verteilung und eine genaue und konstante Dosierung der Pulverpartikel im Pulver-LuftStrom für eine gleichmäßige Beschichtung von besonderer Bedeutung sind.In electrostatic powder coating devices, the applicators, i.e. the powder spray guns, must be supplied with the powder in the form of a powder-air mixture, with the most uniform possible distribution and precise and constant metering of the powder particles in the powder-air flow being of particular importance for uniform coating.

Üblicherweise wird hierfür das Beschichtungspulver in speziellen Vorratsbehältern aufbereitet. Diese Vorratsbehälter weisen eine Fluidisier- und Fördereinrichtung auf. Ein solcher Vorratsbehälter ist aus der DE-PS 36 11 039 bekannt. Bei der dort beschriebenen Art von Fluidisier- und Fördereinrichtung ist es schwierig, eine genaue Förderung und Dosierung vorzunehmen. Dieser Nachteil wird durch in der Regel lange Förderleitungen vom im allgemeinen sehr großen Pulvervorratsbehälter zum entfernten Pulverbeschichtungsgerät verstärkt. Weiterhin ist es bei dieser und ähnlichen bekannten Einrichtungen nicht möglich, beim Anschluß von mehreren Beschichtungsgeräten an einen einzigen Vorratsbehälter für jedes Pulverbeschichtungsgerät eine gesonderte Anpassung vorzunehmen, das heißt, Menge und Zusammensetzung des Pulver-Luft-Gemisches auf die jeweiligen Anforderungen abzustimmen.For this purpose, the coating powder is usually prepared in special storage containers. These storage containers have a fluidizing and conveying device. Such a storage container is known from DE-PS 36 11 039. With the type of fluidizing and conveying device described there, it is difficult to carry out an exact conveying and metering. This disadvantage is exacerbated by generally long delivery lines from the generally very large powder storage container to the remote powder coating device. Furthermore, it is not possible with this and similar known devices to make a separate adjustment for each powder coating device when connecting several coating devices to a single storage container, that is to say to adjust the quantity and composition of the powder-air mixture to the respective requirements.

Aufgabe der vorliegenden Erfindung ist es deshalb, eine Einrichtung zum Speisen zu einem Pulverbeschichtungsgerät zu schaffen, mit deren Hilfe es gelingt, Fördergleichmäßigkeit und Dosiergenauigkeit wesentlich zu verbessern und von einem einzigen Vorratsbehälter aus mehrere Pulverbeschichtungsgeräte bezüglich Durchsatzmenge und Luftanteil des Pulver-Luft-Gemisches voneinander unabhängig zu versorgen.The object of the present invention is therefore to provide a device for dining on a powder coating device, with the aid of which it is possible to significantly improve conveying uniformity and metering accuracy and, independently of one another, with respect to the throughput quantity and air fraction of the powder-air mixture, from a single storage container to supply.

Die Lösung dieser Aufgabe ergibt sich aus den Merkmalen des Patentanspruchs 1.The solution to this problem results from the features of patent claim 1.

Aus der DE-OS-37 29 705 war zwar bereits bekannt, zur Aufrechterhaltung eines Feuchtigkeits-Sollwertes von Emailpulver, das bezüglich seiner Temperatur und Feuchtigkeit konditioniert ist, dann, wenn dieser Feuchtigkeitsgehalt abfällt, dem vom Aufbereitungsbehälter kommenden konditionierten Pulver-Luft-Gemisch in einem Beschichtungsbehälter noch weitere anfeuchtende Fluidisierluft zuzusetzen. Die dort beschriebene Anlage dient jedoch ausschließlich der Einstellung des Feuchtigkeitsgehaltes und der Temperatur von Emailpulver. Im Beschichtungsbehälter erfolgt somit keine Ausscheidung der Luft aus dem zugeführten konditionierten Pulver-Luft-Gemisch.From DE-OS-37 29 705 was already known, to maintain a moisture setpoint of enamel powder, which is conditioned with respect to its temperature and humidity, when this moisture content drops, the conditioned powder-air mixture coming from the processing container in to add further moisturizing fluidizing air to a coating container. However, the system described there only serves to adjust the moisture content and the temperature of enamel powder. There is therefore no separation of the air from the supplied conditioned powder-air mixture in the coating container.

Ein Vorteil der erfindungsgemäßen Lösungen ist darin zu sehen, daß durch Ausscheiden der Luft aus dem ankommenden Pulver-Luft-Gemisch, Fluidisieren und Dosieren des verbleibenden Pulvers in einem einem einzelnen Pulverbeschichtungsgerät zugeordneten Dosierbehälter Zusammensetzung und Volumen des Pulver-Luft-Stromes der jeweils gewünschten Beschichtungsqualität angepaßt werden können, trotz dem für mehrere Pulverbeschichtungsgeräte nur ein einziger Vorratsbehälter vorgesehen ist. Dabei ist für die Dosiergenauigkeit wesentlich, daß aus dem vom Vorratsbehälter ankommenden Pulver-Luft-Gemisch zunächst die Fluidisierluft ausgeschieden wird, und daß das verbleibenden Pulver dann definiert erneut fluidisiert und dosiert wird. Ein weiterer Vorteil der Erfindung ergibt sich aus dem relativ kurzen Förderweg von Dosierbehälter - der bei kleiner Bauform in räumlicher Nähe zum Beschichtungsgerät untergebracht sein kann - zum zugeordneten Pulverbeschichtungsgerät, wodurch die Fördergleichmäßigkeit wesentlich weniger als bei herkömmlichen langen Förderleitungen beeinträchtigt wird. Nicht zuletzt ermöglicht die Verwendung eines Dosierbehälters den Betrieb eines diesem zugeordneten Pulverbeschichtungsgerätes selbst bei nicht förderndem Vorratsbehälter, zumindest für eine gewisse, vom Volumen des Dosierbehälters abhängige Zeitspanne.An advantage of the solutions according to the invention can be seen in the fact that by separating the air from the incoming powder-air mixture, fluidizing and metering the remaining powder in a metering container assigned to a single powder coating device, the composition and volume of the powder-air stream of the desired coating quality can be adapted, despite the fact that only a single reservoir is provided for several powder coating devices. It is essential for the dosing accuracy that the fluidizing air is first excreted from the powder-air mixture arriving from the storage container, and that the remaining powder is then fluidized and dosed again in a defined manner. Another advantage of the invention results from the relatively short conveying path from the metering container - which can be accommodated in a small design in close proximity to the coating device - to the associated powder coating device, as a result of which the conveying uniformity is significantly less impaired than with conventional long conveying lines. Last but not least, the use of a dosing container enables the operation of a powder coating device assigned to it, even when the storage container is not conveying, at least for a certain period of time which is dependent on the volume of the dosing container.

Die Erfindung ist im folgenden anhand eines bevorzugten, in den Zeichnungen dargestellten Ausführungsbeispieles mit weiteren Einzelheiten näher erläutert. Es zeigen:

  • Fig. 1 eine schematische Darstellung einer Einrichtung zum Speisen eines Pulver-Luft-Gemisches, zu einem Pulverbeschichtungsgerät,
  • Fig. 2 einen Vertikalschnitt durch den Dosierbehälter von Fig. 1,
  • Fig. 3 einen Vertikalschnitt durch den um 90 gedrehten Dosierbehälter von Fig. 2 und
  • Fig. 4 einen Horizontalschnitt durch den Dosierbehälter von Fig. 2.
The invention is explained in more detail below with reference to a preferred embodiment shown in the drawings. Show it:
  • 1 is a schematic representation of a device for feeding a powder-air mixture to a powder coating device,
  • 2 shows a vertical section through the dosing container of FIG. 1,
  • Fig. 3 is a vertical section through the 90 rotated dosing container of Fig. 2 and
  • 4 shows a horizontal section through the dosing container from FIG. 2.

Fig. 1 zeigt eine schematische Darstellung der Einrichtung mit einem Vorratsbehälter 1, Förderleitungen 2 und 4, einem Dosierbehälter 3 und einem Pulverbeschichtungsgerät 5. In der Darstellung nach Fig. 1 sind lediglich ein Dosierbehälter 3 und ein Pulverbeschichtungsgerät 4 gezeigt, es können jedoch selbstverständlich mehrere solche Dosierbehälter/Beschichtungsgerät-Paarean den Vorratsbehälter 1 angeschlossen sein. Dabei ist die Förderleitung 4 von Dosierbehälter zu Pulverbeschichtungsgerät in der Regel kurz gegenüber der Förderleitung 2 von Vorratsbehälter 1 zu Dosierbehälter 3.1 shows a schematic illustration of the device with a storage container 1, delivery lines 2 and 4, a metering container 3 and a powder coating device 5. In the illustration according to FIG. 1, only one metering container 3 and one powder coating device 4 are shown, but of course several can be used such dosing containers / coating device pairs can be connected to the storage container 1. The conveying line 4 from the metering container to the powder coating device is generally short compared to the conveying line 2 from the storage container 1 to the metering container 3.

Kernstück der Einrichtung zum Speisen eines Pulver-Luft-Gemisches zu einem Pulverbeschichtungsgerät ist der in Figuren 2 bis 4 dargestellte Dosierbehälter 3. Figuren 2 bis 4 zeigen verschiedene Ansichten des Dosierbehälters mit Vorrichtungen zumThe centerpiece of the device for feeding a powder-air mixture to a powder coating device is the dosing container 3 shown in FIGS. 2 to 4. FIGS. 2 to 4 show different views of the dosing container with devices for

Ausscheiden der Luft aus dem ankommenden Pulver-Luft-Gemisch 10,
Fluidisieren des verbleibenden Pulvers 11,
Dosieren des neu erzeugten Pulver-Luft-Gemisches 12 und Weiterfördern des dosierten Pulver-Luft-Gemisches 13.Elimination of the air from the incoming powder-air mixture 10,
Fluidizing the remaining powder 11,
Dosing of the newly created powder-air mixture 12 and conveying the metered powder-air mixture 13 further.

Im Ausführungsbeispiel ist im Behälterdeckel 14 ein Zyklon 15 untergebracht, mit einer horizontalen Zuführung 16 für das vom Vorratsbehälter kommende Pulver-Luft-Gemisch und einer oberen, eine Verbindung zur Atmosphäre bildenden Öffnung 17 zum Abführen der Luftbestandteile des Pulver-Luft-Gemisches. Der Dosierbehälter 3 weist weiterhin eine Pulverkammer 20 mit einem unteren Pulverauslaß 28 auf, welcher von einer Abdeckglokke 29 überdeckt ist. Der Boden der Pulverkammer 20 wird von der Fluidisiervorrichtung 11 gebildet, die einen Fluidisierboden 31 mit Fluidisierlufteingang 32 an dessen Unterseite umfaßt. Unterhalb dieser Fluidisiereinrichtung ist eine Dosierkammer 34 mit seitlichem Dosierlufteingang 35 vorgesehen, in deren Innerem eine feinporige, gasdurchlässige Dosierpatrone 36 untergebracht ist. Der Dosierkammer nachfolgend ist die Fördereinrichtung 13 angeordnet, die einen Injektor 38 mit Injektorlufteingang 39 und Austritt 40 für das dosierte Pulver-Luft-Gemisch zum zugeordneten Pulverbeschichtungsgerät aufweist. In der Pulverkammer 20 ist eine Pulverfüllstandsanzeige 21 vorgesehen, die im Ausführungsbeispiel als pneumatische Höhenüberwachung mit einem Druckrohr 22 und einer Blende 23 im Querschnitt dieses Rohres, an seinem unteren freien Ende ausgeführt ist. Zusätzlich ist der Dosierbehälter 3 mit Halterungen 25, 26 versehen, um ihn in der Nähe des Arbeitsplatzes, beispielsweise an einer Kabinenwand, befestigen zu können.In the exemplary embodiment, a cyclone 15 is accommodated in the container lid 14, with a horizontal feed 16 for the powder-air mixture coming from the storage container and an upper opening 17, which forms a connection to the atmosphere, for discharging the air components of the powder-air mixture. The dosing container 3 also has a powder chamber 20 with a lower powder outlet 28, which is covered by a cover bell 29. The bottom of the powder chamber 20 is formed by the fluidizing device 11, which comprises a fluidizing bottom 31 with fluidizing air inlet 32 on its underside. Below this fluidizing device there is a metering chamber 34 with a metering air inlet 35 on the side, in the interior of which a fine-pored, gas-permeable metering cartridge 36 is accommodated. The dosing chamber is followed by the conveying device 13, which has an injector 38 with injector air inlet 39 and outlet 40 for the dosed powder-air mixture to the associated powder coating device. In the powder chamber 20, a powder level indicator 21 is provided, which in the exemplary embodiment is designed as a pneumatic height monitor with a pressure tube 22 and an orifice 23 in the cross section of this tube, at its lower free end. In addition, the dosing container 3 is provided with brackets 25, 26 in order to be able to fasten it in the vicinity of the workplace, for example on a cabin wall.

Die beschriebene Einrichtung arbeitet folgendermaßen: Das vom Vorratsbehälter 1 kommende Pulver-Luft-Gemisch strömt tangential in den Zyklon 15 ein. Dabei entsteht an der inneren Zyklonwand ein Primärwirbel, durch den unter Einfluß der Zentrifugalbeschleunigung die schweren Pulverteilchen nach unten abgeschieden werden, während die leichten Luftteilchen in einem engen, aufsteigenden Sekundärwirbel nach oben getragen und durch die Öffnung 17 ausgeschieden werden. Das Pulver wird nachfolgend in der Pulverkammer 20 gesammelt und durch die den Fluidisierboden 31 durchströmende Fluidisierluft fluidisiert. Das erzeugte Pulver-Luft-Gemisch wird durch die Sogwirkung des Injektors 38 durch den Pulverauslaß 28 nach unten abgezogen. Das Pulver-Luft-Gemisch durchströmt dabei die Dosierkammer 34 entlang der Dosierpatrone 36, durch deren feinporige, gasdurchlässige Wand dem Pulver-Luft-Gemisch über den Dosierlufteingang 35 weitere Luft beigemengt werden kann; das heißt, das Pulver-Luft-Gemisch kann weiter "verdünnt" werden. Die durch den Injektorlufteingang 39 eintretende Förderluft bestimmt die Fördermenge des Pulver-Luft-Gemisches zum zugeordneten Pulverbeschichtungsgerät, und der Pulver-LuftStrom wird in bekannter Weise zum nahe benachbarten Beschichtungsgerät weitergefördert.The device described works as follows: The powder-air mixture coming from the storage container 1 flows tangentially into the cyclone 15. This creates a primary vortex on the inner cyclone wall, through which the heavy powder particles are separated downwards under the influence of centrifugal acceleration, while the light air particles are carried upwards in a narrow, rising secondary vortex and excreted through the opening 17. The powder is subsequently collected in the powder chamber 20 and fluidized by the fluidizing air flowing through the fluidizing tray 31. The powder-air mixture generated is drawn off by the suction effect of the injector 38 through the powder outlet 28. The powder-air mixture flows through the metering chamber 34 along the metering cartridge 36, through whose fine-pored, gas-permeable wall further air can be added to the powder-air mixture via the metering air inlet 35; that is, the powder-air mixture can be further "diluted". The conveying air entering through the injector air inlet 39 determines the conveyed quantity of the powder-air mixture to the associated powder coating device, and the powder-air flow is conveyed in a known manner to the neighboring coating device.

Während des Betriebes wird die Pulverfüllstandshöhe in der Pulverkammer 20 von der Pulverfüllstandsanzeige 21 angegeben. Dabei wird im Falle einer pneumatischen Füllstandsüberwachung von der Blende 23 im Ende des Druckrohres 22 die Füllstandshöhe entsprechend der auf sie einwirkenden Gewichtskraft des Pulvers erfaßt. Mit vorgegebenen Werten für minimale und maximale Füllhöhe und aufgrund der gemessenen Pulverfüllstandshöhe kann die Förderung des Pulver-Luft-Gemisches vom Vorratsbehälter 1 zum Dosierbehälter 3 entsprechend der berechneten Differenzen aus gemessener Höhe und Höhengrenzwerten geregelt werden.During operation, the powder fill level in the powder chamber 20 is indicated by the powder fill level indicator 21. In this case, in the case of a pneumatic fill level monitoring, the fill level is detected by the orifice 23 in the end of the pressure tube 22 in accordance with the weight force of the powder acting on it. The delivery of the powder-air mixture from the storage container 1 to the dosing container 3 can be regulated according to the calculated differences from the measured height and height limit values with predetermined values for the minimum and maximum filling height and on the basis of the measured powder filling level.

In der bisherigen Beschreibung wurde beispielhaft eine bevorzugte Ausführung der Erfindung näher erläutert. Es sind jedoch auch andere Ausgestaltungen der Erfindung denkbar.In the previous description, a preferred embodiment of the invention has been explained in more detail by way of example. However, other configurations of the invention are also conceivable.

Die Reihenfolge, nach dem Ausscheiden der Luft verbleibendes Pulver zuerst zu fluidisieren und daraufhin das erzeugte Pulver-Luft-Gemisch zu dosieren kann durch eine entsprechende Anordnung der Dosiervorrichtung 12 nach der Ausscheidevorrichtung 10 und vor der Fluidisiervorrichtung 11 umgekehrt werden. Diese Anordnung ergibt für bestimmte Anwendungszwecke eine besonders exakte Dosierung.The sequence of first fluidizing powder remaining after the air has been discharged and then metering the powder-air mixture produced can be reversed by arranging the metering device 12 appropriately after the separating device 10 and before the fluidizing device 11. This arrangement results in a particularly exact dosage for certain applications.

Ferner kann die Pulverfüllstandsanzeige 21 in der Pulverkammer 20 auch kapazitiv, induktiv, mechanisch oder optoelektrisch durch einen transparenten Behälterzylinder erfolgen. Desweiteren kann das dosierte Pulver-Luft-Gemisch anstatt mit einem Injektor auch mechanisch mittels Schnecke, Zellenrad oder dergleichen zum zugeordneten Pulverbeschichtungsgerät gefördert werden.Furthermore, the powder level indicator 21 in the powder chamber 20 can also be capacitive, inductive, mechanical or optoelectrical by means of a transparent container cylinder. Furthermore, instead of using an injector, the metered powder-air mixture can also be conveyed mechanically to the assigned powder coating device by means of a screw, cell wheel or the like.

In einer alternativen Ausgestaltung der Erfindung ist der Dosierbehälter 3 unmittelbar ohne eine zwischengeschaltete Förderleitung 4 mit dem Pulverbeschichtungsgerät verbunden. Dies bietet sich besonders bei fest installierten Beschichtungsgeräten an. In diesem Falle ist es auch möglich, den Hochspannungserzeuger des elektrostatischen Pulverbeschichtungsgerätes in oder an dem Dosierbehälter 3 unterzubringen.In an alternative embodiment of the invention, the metering container 3 is connected directly to the powder coating device without an intermediate feed line 4. This is particularly useful for permanently installed coating devices. In this case it is also possible to accommodate the high voltage generator of the electrostatic powder coating device in or on the dosing container 3.

Darüberhinaus können alle Bestandteile des Dosierbehälters steck- oder schraubbar miteinander verbunden sein.In addition, all components of the dosing container can be connected to one another by plugging or screwing.

Claims (8)

1. Device for supplying a powder-air mixture to a powder-coating device (5), wherein the powder is fluidized in a powder storage container (1) and the powder-air mixture thereby arising is conveyed by way of an intermediate container (3), likewise equipped with a fluidizing device (11), to the powder-coating device (5), characterized in that in use the intermediate container (3) is constructed as dosing container closely adjacent to the powder-coating device (5), the dosing container having a cyclone-like air extractor (10), the fluidizing device (11) and a dosing device (12) for producing a dosed powder-air mixture and a conveying device (13) to convey this powder-air mixture further to the powder-coating device.
2. Device according to claim 1, characterized in that the air extractor (10) is a cyclone (15) constructed in the container cover (14), with a powder supply line (16) for the powder-air mixture coming from the storage container (1) and an opening (17) to the atmosphere for extracted air.
3. Device according to claim 1 or 2, characterized in that the fluidizing device (11) is accommodated in the base region of the dosing container (3) and has a fluidizing bed (31) with fluidizing air input (32) from below.
4. Device according to one of claims 1 to 3, characterized in that a dosing device (12) downstream of the fluidizing bed (31) has a powder dosing chamber (34) in which there is arranged a dosing cartridge (36) with dosing air input (35) and finely distributed dosing air outlet to enrich the powder-air mixture with additional air.
5. Device according to one of claims 1 to 4, characterized in that the conveying device (13) downstream of the dosing chamber (34) and the fluidizing bed (31) consists of an injector (38) with injector air input (39) and powder outlet (40), and by way of this outlet (40) the dosed powder-air mixture is conveyed further to the associated powder-coating device (5).
6. Device according to one of claims 1 to 5, characterized by a device (22) displaying the powder level in a powder chamber (20) between the cover and the base of the dosing container (3).
7. Device according to claim 6, characterized in that the device for the powder level display (22) has a min/max control device for conveying the powder coming from the storage container (1).
EP92106291A 1991-06-28 1992-04-10 Device for feeding a powder coating apparatus with a mixture of air and powder Expired - Lifetime EP0525303B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4121455A DE4121455C2 (en) 1991-06-28 1991-06-28 Device for feeding powder coating devices with a powder-air mixture
DE4121455 1991-06-28

Publications (3)

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EP0525303A1 EP0525303A1 (en) 1993-02-03
EP0525303B1 true EP0525303B1 (en) 1995-06-28
EP0525303B2 EP0525303B2 (en) 2001-08-08

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US (1) US5294217A (en)
EP (1) EP0525303B2 (en)
JP (1) JPH0817997B2 (en)
DE (2) DE4121455C2 (en)

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Also Published As

Publication number Publication date
DE4121455A1 (en) 1993-01-14
JPH0817997B2 (en) 1996-02-28
JPH05192630A (en) 1993-08-03
DE59202680D1 (en) 1995-08-03
US5294217A (en) 1994-03-15
DE4121455C2 (en) 1994-10-27
EP0525303A1 (en) 1993-02-03
EP0525303B2 (en) 2001-08-08

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