EP1060795A2 - Spray coating apparatus - Google Patents

Spray coating apparatus Download PDF

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Publication number
EP1060795A2
EP1060795A2 EP00110032A EP00110032A EP1060795A2 EP 1060795 A2 EP1060795 A2 EP 1060795A2 EP 00110032 A EP00110032 A EP 00110032A EP 00110032 A EP00110032 A EP 00110032A EP 1060795 A2 EP1060795 A2 EP 1060795A2
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EP
European Patent Office
Prior art keywords
spray
current
voltage
high voltage
coated
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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.)
Granted
Application number
EP00110032A
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German (de)
French (fr)
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EP1060795B1 (en
EP1060795A3 (en
Inventor
Felix Mauchle
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Gema Switzerland GmbH
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Gema Switzerland GmbH
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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
    • B05B5/10—Arrangements for supplying power, e.g. charging power

Definitions

  • the invention relates to a spray coating device according to the Preamble of claim 1.
  • a spray coating of this type is known from EP 0 160 179 B1.
  • a An operator can use a keyboard to set a desired voltage value and enter a desired current value, which of a Control device should be kept constant. It is for the distance between the spray device and the object to be coated Threshold provided. If the distance is greater than the threshold is, then the high voltage at the high voltage electrode Spray device kept constant regardless of the object distance, the Spray current of the high voltage electrode with increasing object distance becomes smaller or larger as the object distance becomes smaller. If the Distance is less than the threshold, then the spray current kept constant regardless of distance changes by one Current rise through a corresponding voltage reduction is counteracted. Immediately before the object the spray device touched, the high voltage breaks down completely (contact protection).
  • the Spray current from the electrode to the object to be coated becomes indirect measured by measuring the electrical current which is generated by a Primary winding of a transformer flows, on the secondary winding one High-voltage cascade connection with rectifiers and capacitors is connected, which is the high-voltage DC voltage for the electrode generated.
  • a spray coating device is known from US Pat. No. 4,000,443 which is an increase in spray current when an object to be coated approaches the spraying device by reducing the High voltage is counteracted to keep the spray current constant.
  • the spray current is measured indirectly by measuring the in the secondary winding between the transformer and a high-voltage cascade flowing current measured.
  • One is known from EP 0 626 208 B1 Spray coating device known, in which also the Input voltage of a high voltage generator reversed to Spray current is changed, the spray flow at one of the High voltage electrode upstream electrical resistance indirectly is measured by measuring a voltage drop.
  • From GB 2 077 006 A it is known to increase the current of the electrode spray current a corresponding voltage reduction of the high voltage within a to counteract predetermined operational window.
  • US 4 187 527 it is known to do so in short time intervals to compare measured spray current measurements and in the case a rapid increase in current, which indicates a short circuit, the switch off electrical power supply.
  • the object of the invention is to solve the dangers of one high electrical voltage at the high voltage electrode at a large distance between an electrically conductive object or an excessive current or short-circuit current when an object comes too close to the Avoid high-voltage electrode, taking the object too coating object or an operator or another Can be the subject, and at the same time the spray coating device to be designed in such a way that optimal electrical energy consumption is kept to a minimum Coating results can be achieved.
  • the invention is particularly advantageous in connection with a counter electrode, which is connected to a potential that to the high voltage potential the high voltage electrode has a large electrical voltage difference, e.g. B. is connected to earth potential to free electrical particles, especially ions and electrons, which derive from the Flowing out the high-voltage electrode, but freely vagabonding instead of with the spray coating material from the spray device to the flying coating object.
  • Counter electrodes are e.g. B. from the EP 0 756 899 A2 is known.
  • the spray coating device shown schematically in FIG. 1 contains one Spray device 2 for spraying coating material 4 in the form of Liquid or preferably powder on an object to be coated 6 it is assumed that the objects to be coated are made of electrical exist conductive material and are connected to earth potential 8.
  • the Objects 6 are in automatic systems by a, not shown, Conveyor transported past the spray device 2 and arrive thereby in the spray jet schematically represented by an arrow Coating material 4.
  • the spray device 2 has at least one high-voltage electrode 10 provided for electrostatic charging of the coating material 4, which from a high voltage generator 12 with DC high voltage in the range between 1 kV and 150 kV, preferably one in between lying value, is supplied.
  • the high voltage generator can be known in Way a transformer to step up a low AC voltage into a higher AC voltage and a Cascade circuit, which contain a variety of in a known manner Contains rectifiers and capacitors and the AC voltage in the DC to high voltage converts.
  • the low AC voltage is dependent on an oscillator 14 generated by a control voltage U-ST, which is a manipulated variable for the High voltage of the high voltage electrode 10 is.
  • the oscillator 14 can be part of the high voltage generator 12 and as such be integrated into the spray device 2, or according to FIG. 1 in a Control unit can be integrated, which forms a control device 16 overall.
  • the control device 16 contains an operating parameter memory 18, which via a data transfer path 19 from a data entry station, for example a higher-level computer or manually, e.g. B. via a Keyboard, variably adjustable at least one high voltage limit value HV-BG and at least one spray current limit value I-BG for each maximum achievable value can be entered at the high voltage electrode and can be stored in it.
  • a data entry station for example a higher-level computer or manually, e.g. B. via a Keyboard
  • variably adjustable at least one high voltage limit value HV-BG and at least one spray current limit value I-BG for each maximum achievable value can be entered at the high voltage electrode and can be stored in it.
  • a data entry station for example a higher-level computer or manually, e.g. B. via a Keyboard
  • HV-BG high voltage limit value
  • I-BG spray current limit value
  • the high voltage limit value HV-BG is from the operating parameter memory 18 input to a high voltage limiting circuit 20.
  • the Spray current limit value I-BG is from the operating parameter memory 18 entered into a spray flow controller 22.
  • the spray current flowing from an object 6 to be coated onto earth High-voltage electrode 10 is applied by a spray current measuring circuit 24 the side of objects 6 connected to earth 8 and measured as Actual spray current value I-S is also entered in the spray current controller.
  • the spray current controller 22 compares the actual spray current value I-S with that Spray current limit value I-BG and generates one depending on this High-voltage regulator sizes U-RG, which is generated by the spray current regulator 22 is given to the high voltage limiting circuit 20.
  • the Spray flow controller 22 is preferably a P-I controller (proportional-integral controller).
  • the high voltage limiting circuit 20 generates depending on the high-voltage limit value HV-BG and the high-voltage controller size U-RG the control voltage U-ST, which in the form of a DC input voltage is supplied to the oscillator 14 and the Actuating variable for the high voltage of the high voltage electrode 10 is.
  • Fig. 2 shows on the horizontal axis the spray current in ⁇ A and on the vertical axis is the corresponding high voltage in kV.
  • the top one Characteristic curve 26 with filled squares is a standard characteristic curve. She shows, as in known devices with a decreasing distance between the High-voltage electrode 10 and an object 6 to be coated Spray current of the high voltage electrode 10 increases and at the same time the High voltage drops. The high voltage has its maximum value at greatest possible distance or infinitely large distance from the coating object 6 or another electrically conductive Object from the high voltage electrode 10.
  • the middle curve 27 with the unfilled squares relates to one Embodiment in which the maximum DC high voltage of High voltage electrode 10 to a maximum value HV-BG of 80 kV is limited, but no current limitation I-BG was made.
  • FIG. 3 shows the spray device 2 in somewhat more detail. It shows that one or more high voltage electrodes 10 outside or inside of a coating material channel 30 can be arranged. He will Coating material, e.g. B. coating powder, via a line 31, for. B. a hose fed.
  • Coating material e.g. B. coating powder
  • the spray device 2 with a reference potential, for. B. Earth potential, connected counter electrodes 32 (arrester electrodes) be provided, which free electrical charges (ions, electrons), which are emitted by the electrodes 10, collect and at ground potential deduce. It has been shown that the invention is much less free electrical particles are formed, especially free ions, and thus also a less power loss.
  • a reference potential for. B. Earth potential
  • counter electrodes 32 aromatic electrodes

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Formation And Processing Of Food Products (AREA)

Abstract

The spray coating device has a HV generator (12) for supplying at least one HV electrode (10) of a coating spray (2), with regulation of the electric current carried by the coating material between the coating spray and the coated object, using a regulator (16) with current and voltage limitation functions, supplied with the measured current value by a measuring circuit (24) connected in a feedback path between the coated object and the regulator.

Description

Die Erfindung betrifft eine Sprühbeschichtungseinrichtung gemäß dem Oberbegriff von Anspruch 1.The invention relates to a spray coating device according to the Preamble of claim 1.

Eine Sprühbeschichtung dieser Art ist aus der EP 0 160 179 B1 bekannt. Eine Bedienungsperson kann über eine Tastatur einen gewünschten Spannungwert und einen gewünschten Stromwert eingeben, welche von einer Regeleinrichtung konstant gehalten werden sollen. Dabei ist für den Abstand zwischen der Sprühvorrichtung und dem zu beschichtenden Objekt ein Schwellenwert vorgesehen. Wenn der Abstand größer als der Schwellenwert ist, dann wird die Hochspannung an der Hochspannungselektrode der Sprühvorrichtung unabhängig vom Objektabstand konstant gehalten, wobei der Sprühstrom der Hochspannungselektrode mit zunehmendem Objektabstand kleiner bzw. mit kleiner werdendem Objektabstand größer wird. Wenn der Abstand kleiner als der Schwellenwert ist, dann wird der Sprühstrom unabhängig von Abstandsänderungen konstant gehalten, indem einem Stromanstieg durch eine entsprechende Spannungsreduzierung entgegengewirkt wird. Unmittelbar bevor das Objekt die Sprühvorrichtung berührt, bricht die Hochspannung völlig zusammen (Kontaktschutz). Der Sprühstrom von der Elektrode zu dem zu beschichtenden Objekt wird indirekt gemessen durch Messung des elektrischen Stromes, welcher durch eine Primärwicklung eines Transformators fließt, an dessen Sekundärwicklung eine Hochspannungs-Kaskadenschaltung mit Gleichrichtern und Kondensatoren angschlossen ist, welche die Hochspannungs-Gleichspannung für die Elektrode erzeugt.A spray coating of this type is known from EP 0 160 179 B1. A An operator can use a keyboard to set a desired voltage value and enter a desired current value, which of a Control device should be kept constant. It is for the distance between the spray device and the object to be coated Threshold provided. If the distance is greater than the threshold is, then the high voltage at the high voltage electrode Spray device kept constant regardless of the object distance, the Spray current of the high voltage electrode with increasing object distance becomes smaller or larger as the object distance becomes smaller. If the Distance is less than the threshold, then the spray current kept constant regardless of distance changes by one Current rise through a corresponding voltage reduction is counteracted. Immediately before the object the spray device touched, the high voltage breaks down completely (contact protection). The Spray current from the electrode to the object to be coated becomes indirect measured by measuring the electrical current which is generated by a Primary winding of a transformer flows, on the secondary winding one High-voltage cascade connection with rectifiers and capacitors is connected, which is the high-voltage DC voltage for the electrode generated.

Aus der US 4 000 443 ist eine Sprühbeschichtungseinrichtung bekannt, bei welcher einem Anstieg des Sprühstroms, wenn ein zu beschichtendes Objekt sich der Sprühvorrichtung nähert, durch eine entsprechende Reduzierung der Hochspannung entgegengewirkt wird, um den Sprühstrom konstant zu halten. Der Sprühstrom wird indirekt durch Messen des in der Sekundärwicklung zwischen dem Transformator und einer Hochspannungs-Kaskadenschaltung fließenden Stromes gemessen. Aus der EP 0 626 208 B1 ist eine Sprühbeschichtungeinrichtung bekannt, bei welcher ebenfalls die Eingangsspannung eines Hochspannungserzeugers umgekehrt zum Sprühstrom verändert wird, wobei der Sprühstrom an einem der Hochspannungselektrode vorgeschalteten elektrischen Widerstand indirekt gemessen wird, indem ein Spannungsabfall gemessen wird. Aus der GB 2 077 006 A ist es bekannt, einem Stromanstieg des Elektroden-Sprühstromes durch eine entsprechende Spannungsreduzierung der Hochspannung innerhalb eines vorbestimmten Betriebsfensters (operational window) entgegenzuwirken. Aus der US 4 187 527 ist es bekannt, in kurzen Zeitabständen nacheinander gemessene Sprühstrom-Messwerte miteinander zu vergleichen und im Falle eines schnellen Stromanstieges, welcher auf einen Kurzschluß hindeutet, die elektrische Stromversorgung abzuschalten.A spray coating device is known from US Pat. No. 4,000,443 which is an increase in spray current when an object to be coated approaches the spraying device by reducing the High voltage is counteracted to keep the spray current constant. The spray current is measured indirectly by measuring the in the secondary winding between the transformer and a high-voltage cascade flowing current measured. One is known from EP 0 626 208 B1 Spray coating device known, in which also the Input voltage of a high voltage generator reversed to Spray current is changed, the spray flow at one of the High voltage electrode upstream electrical resistance indirectly is measured by measuring a voltage drop. From GB 2 077 006 A it is known to increase the current of the electrode spray current a corresponding voltage reduction of the high voltage within a to counteract predetermined operational window. Out US 4 187 527 it is known to do so in short time intervals to compare measured spray current measurements and in the case a rapid increase in current, which indicates a short circuit, the switch off electrical power supply.

Aus der EP 0 559 608 B1 ist es bekannt, den elektrischen Sprühstrom, welcher von der Hochspannungselektrode auf das zu beschichtende Objekt fließt, durch ein Strommessgerät zu messen, welches auf einem elektrischen Stromweg zwischen dem zu beschichtenden Objekt und Erdpotential angeordnet ist.It is known from EP 0 559 608 B1 the electrical spray current, which flows from the high-voltage electrode onto the object to be coated to measure an ammeter which is on an electrical current path is arranged between the object to be coated and earth potential.

Durch die Erfindung soll die Aufgabe gelöst werden, die Gefahren einer zu hohen elektrischen Spannung an der Hochspannungselektrode bei einem großen Abstand eines elektrisch leitenden Objektes oder einen zu hohen Strom oder Kurzschlußstrom bei zu naher Annäherung eines Objektes an die Hochspannungselektrode zu vermeiden, wobei das Objekt ein zu beschichtender Gegenstand oder eine Bedienungsperson oder ein anderer Gegenstand sein kann, und gleichzeitig die Sprühbeschichtungseinrichtung derart auszubilden, daß mit geringstem elektrischem Energieaufwand optimale Beschichtungsergebnisse erzielt werden.The object of the invention is to solve the dangers of one high electrical voltage at the high voltage electrode at a large distance between an electrically conductive object or an excessive current or short-circuit current when an object comes too close to the Avoid high-voltage electrode, taking the object too coating object or an operator or another Can be the subject, and at the same time the spray coating device to be designed in such a way that optimal electrical energy consumption is kept to a minimum Coating results can be achieved.

Diese Aufgabe wird gemäß der Erfindung durch die Kombination der Merkmale von Anspruch 1 gelöst.This object is achieved according to the invention by the combination of the features solved by claim 1.

Durch das kennzeichnenden Merkmal von Anspruch 1 einer direkten Messung des Sprühstromes erhält man unverfälschte Messergebnisse und eine schnelle Reaktion der Regeleinrichtung auf Abweichungen von Istwerten von Sollwerten.Due to the characteristic feature of claim 1 a direct measurement of the spray stream you get unadulterated measurement results and a quick one Response of the control device to deviations from actual values from target values.

Weitere Merkmale der Erfindung sind in den Unteransprüchen enthalten.Further features of the invention are contained in the subclaims.

Die Erfindung ist besonders vorteilhaft in Verbindung mit einer Gegenelektrode, welche an ein Potential angeschlossen ist, das zum Hochspannungspotential der Hochspannungselektrode eine große elektrische Spannungsdifferenz hat, z. B. an Erdpotential angeschlossen ist, um freie elektrische Teilchen, insbesondere Ionen und Elektronen, abzuleiten, welche von der Hochspannunselektrode ausströmen, jedoch frei herumvagabundieren, anstatt mit dem Sprühbeschichtungsmaterial von der Sprühvorrichtung auf das zu beschichtende Objekt zu fliegen. Gegenelektroden sind z. B. aus der EP 0 756 899 A2 bekannt.The invention is particularly advantageous in connection with a counter electrode, which is connected to a potential that to the high voltage potential the high voltage electrode has a large electrical voltage difference, e.g. B. is connected to earth potential to free electrical particles, especially ions and electrons, which derive from the Flowing out the high-voltage electrode, but freely vagabonding instead of with the spray coating material from the spray device to the flying coating object. Counter electrodes are e.g. B. from the EP 0 756 899 A2 is known.

Die Erfindung wird im folgenden mit Bezug auf die Zeichnungen anhand von einer bevorzugten Ausführungsform als Beispiel beschrieben. In den Zeichnungen zeigen:

Fig. 1
schematisch eine Sprühbeschichtungseinrichtung nach der Erfindung,
Fig. 2
ein Hochspannungs-Sprühstrom-Diagramm der Sprühbeschichtungseinrichtung von Fig. 1,
Fig. 3
schematisch eine Sprühvorrichtung der Sprühbeschichtungseinrichtung von Fig. 1.
The invention is described below with reference to the drawings using a preferred embodiment as an example. The drawings show:
Fig. 1
schematically a spray coating device according to the invention,
Fig. 2
2 shows a high-voltage spray current diagram of the spray coating device from FIG. 1,
Fig. 3
schematically shows a spray device of the spray coating device of FIG. 1.

Die in Fig. 1 schematisch gezeigte Sprühbeschichtungseinrichtung enthält eine Sprühvorrichtung 2 zum Besprühen von Beschichtungsmaterial 4 in Form von Flüssigkeit oder vorzugweise Pulver auf ein zu beschichtendes Objekt 6. Dabei wird angenommen, daß die zu beschichtenden Objekte aus elektrisch leitendem Material bestehen und an Erdpotential 8 angeschlossen sind. Die Objekte 6 werden bei automatischen Anlagen durch eine, nicht gezeigte, Fördervorrichtung an der Sprühvorrichtung 2 vorbei transportiert und gelangen dadurch in deren durch einen Pfeil schematisch dargestellten Sprühstrahl des Beschichtungsmaterials 4.The spray coating device shown schematically in FIG. 1 contains one Spray device 2 for spraying coating material 4 in the form of Liquid or preferably powder on an object to be coated 6 it is assumed that the objects to be coated are made of electrical exist conductive material and are connected to earth potential 8. The Objects 6 are in automatic systems by a, not shown, Conveyor transported past the spray device 2 and arrive thereby in the spray jet schematically represented by an arrow Coating material 4.

Die Sprühvorrichtung 2 ist mit mindestens einer Hochspannungselektrode 10 zur elektrostatischen Aufladung des Beschichtungsmaterials 4 versehen, welche von einem Hochspannungserzeuger 12 mit Gleichstrom-Hochspannung im Bereich zwischen 1 kV und 150 kV, vorzugsweise einem dazwischen liegenden Wert, versorgt wird. Der Hochspannungserzeuger kann in bekannter Weise einen Transformator zur Hochtransformierung einer niedrigen Wechselspannung in eine höhere Wechselspannung und eine Kaskadenschaltung enthalten, welche in bekannter Weise eine Vielzahl von Gleichrichtern und Kondensatoren enthält und die Wechselspannung in die Gleichstrom-Hochspannung umwandelt.The spray device 2 has at least one high-voltage electrode 10 provided for electrostatic charging of the coating material 4, which from a high voltage generator 12 with DC high voltage in the range between 1 kV and 150 kV, preferably one in between lying value, is supplied. The high voltage generator can be known in Way a transformer to step up a low AC voltage into a higher AC voltage and a Cascade circuit, which contain a variety of in a known manner Contains rectifiers and capacitors and the AC voltage in the DC to high voltage converts.

Die niedrige Wechselspannung wird von einem Oszillator 14 in Abhängigkeit von einer Steuerspannung U-ST erzeugt, welche eine Stellgröße für die Hochspannung der Hochspannungselektrode 10 ist. Der Oszillator 14 kann ein Teil des Hochspannungserzeugers 12 sein und als solcher in die Sprühvorrichtung 2 integriert sein, oder entsprechend Fig. 1 in ein Steuergerät integriert sein, welches insgesamt eine Regeleinrichtung 16 bildet.The low AC voltage is dependent on an oscillator 14 generated by a control voltage U-ST, which is a manipulated variable for the High voltage of the high voltage electrode 10 is. The oscillator 14 can be part of the high voltage generator 12 and as such be integrated into the spray device 2, or according to FIG. 1 in a Control unit can be integrated, which forms a control device 16 overall.

Die Regeleinrichtung 16 enthält einen Betriebsparameter-Speicher 18, welchem über einen Datentransferweg 19 von einer Dateneingabestation, beispielsweise einem übergeordneten Rechner oder manuell, z. B. über eine Tastatur, variabel einstellbar mindestens ein Hochspannungsbegrenzungswert HV-BG und mindestens ein Sprühstrombegrenzungswert I-BG je für den maximal erreichbaren Wert an der Hochspannungselektrode eingebbar und darin speicherbar sind. Vorzugsweise sind mehrere solcher Werte für verschiedene Betriebssituationen, insbesondere für verschiedene zu beschichtende Objekte und verschiedene Sprühbeschichtungsmaterialien speicherbar. Die gespeicherten Werte können bei einer anderen Ausführungsform nicht versellbare Festwerte sein.The control device 16 contains an operating parameter memory 18, which via a data transfer path 19 from a data entry station, for example a higher-level computer or manually, e.g. B. via a Keyboard, variably adjustable at least one high voltage limit value HV-BG and at least one spray current limit value I-BG for each maximum achievable value can be entered at the high voltage electrode and can be stored in it. Preferably, there are several such values for different operating situations, especially for different ones coating objects and various spray coating materials storable. The saved values can be with another Embodiment not be adjustable fixed values.

Der Hochspannungsbegrenzungswert HV-BG wird von dem Betriebsparameter-Speicher 18 in eine Hochspannungsbegrenzungsschaltung 20 eingegeben. Der Sprühstrombegrenzungswert I-BG wird von dem Betriebsparameter-Speicher 18 in einen Sprühstromregler 22 eingegeben. The high voltage limit value HV-BG is from the operating parameter memory 18 input to a high voltage limiting circuit 20. The Spray current limit value I-BG is from the operating parameter memory 18 entered into a spray flow controller 22.

Der von einem zu beschichtenden Objekt 6 auf Erde fließende Sprühstrom der Hochspannungselektrode 10 wird von einer Sprühstrommesschaltung 24 auf der mit Erde 8 verbundenen Seite der Objekte 6 gemessen und als Sprühstrom-Istwert I-S ebenfalls in den Sprühstromregler eingegeben.The spray current flowing from an object 6 to be coated onto earth High-voltage electrode 10 is applied by a spray current measuring circuit 24 the side of objects 6 connected to earth 8 and measured as Actual spray current value I-S is also entered in the spray current controller.

Der Sprühstromregler 22 vergleicht den Sprühstrom-Istwert I-S mit dem Sprühstrombegrenzungswert I-BG und erzeugt in Abhängigkeit hiervon eine Hochspannungs-Reglergrößen U-RG, welcher von dem Sprühstromregler 22 an die Hochspannungsbegrenzungsschaltung 20 gegeben wird. Der Sprühstromregler 22 ist vorzugsweise ein P-I-Regler (proportional-integral-Regler).The spray current controller 22 compares the actual spray current value I-S with that Spray current limit value I-BG and generates one depending on this High-voltage regulator sizes U-RG, which is generated by the spray current regulator 22 is given to the high voltage limiting circuit 20. The Spray flow controller 22 is preferably a P-I controller (proportional-integral controller).

Die Hochspannungsbegrenzungsschaltung 20 erzeugt in Abhängigkeit von dem Hochgspannungsbegrenzungswert HV-BG und der Hochspannungs-Reglergröße U-RG die Steuerspannung U-ST, welche in Form einer Gleichstrom-Eingangsspannung dem Oszillator 14 zugeführt wird und die Stellgröße für die Hochspannung der Hochspannungselektrode 10 ist.The high voltage limiting circuit 20 generates depending on the high-voltage limit value HV-BG and the high-voltage controller size U-RG the control voltage U-ST, which in the form of a DC input voltage is supplied to the oscillator 14 and the Actuating variable for the high voltage of the high voltage electrode 10 is.

Die Hochspannungsbegrenzungsschaltung 20 bewirkt, daß für den Fall, daß die Hochspannungs-Reglergröße U-RG größer oder gleich dem Hochspannungsbegrenzungswert HV-BG ist, der Gleichspannungswert der Steuerspannung U-ST gleich dem Hochspannungsbegrenzungswert HV-BG ist. Ferner bewirkt die Hochspannungsbegrenzungsschaltung 20, daß in allen den Fällen, wo die Hochspannungs-Reglergröße U-RG kleiner als der Hochspannungsbegrenzungswert HV-BG ist, daß die Steuerspannung U-ST gleich der Hochspannungs-Reglergröße U-RG ist. Dies läßt sich wie folgt darstellen:

Wenn
U-RG ≥ HV-BG,
dann ist
U-ST = HV-BG,
sonst
U-ST = U-RG.
The high-voltage limiting circuit 20 has the effect that, in the event that the high-voltage regulator variable U-RG is greater than or equal to the high-voltage limiting value HV-BG, the DC voltage value of the control voltage U-ST is equal to the high-voltage limiting value HV-BG. Further, the high voltage limit circuit 20 causes the control voltage U-ST to be equal to the high voltage regulator size U-RG in all cases where the high voltage regulator size U-RG is less than the high voltage limit value HV-BG. This can be represented as follows:
If
U-RG ≥ HV-BG ,
then
U-ST = HV-BG ,
otherwise
U-ST = U-RG .

Fig. 2 zeigt auf der horizontalen Achse den Sprühstrom in µA und auf der vertikalen Achse die korrespondierende Hochspannung in kV. Die oberste Kennlinie 26 mit ausgefüllten Quadraten ist eine Standard-Kennlinie. Sie zeigt, wie bei bekannten Einrichtungen mit kleiner werdendem Abstand zwischen der Hochspannungselektrode 10 und einem zu beschichtenden Objekt 6 der Sprühstrom der Hochspannungselektrode 10 ansteigt und gleichzeitig die Hochspannung abfällt. Die Hochspannung hat ihren Maximalwert bei größtmöglichem Abstand bzw. unendlich großem Abstand des zu beschichtenden Objektes 6 oder einens anderen elektrisch leitenden Gegenstandes von der Hochspannungselektrode 10.Fig. 2 shows on the horizontal axis the spray current in µA and on the vertical axis is the corresponding high voltage in kV. The top one Characteristic curve 26 with filled squares is a standard characteristic curve. She shows, as in known devices with a decreasing distance between the High-voltage electrode 10 and an object 6 to be coated Spray current of the high voltage electrode 10 increases and at the same time the High voltage drops. The high voltage has its maximum value at greatest possible distance or infinitely large distance from the coating object 6 or another electrically conductive Object from the high voltage electrode 10.

Die mittlere Kurve 27 mit den nicht-ausgefüllten Quadraten betrifft eine Ausführungsform, bei welcher die maxiamale Gleichstrom-Hochspannung der Hochspannungselektrode 10 auf einen Maximalwert HV-BG von 80 kV begrenzt ist, jedoch keine Strombegrenzung I-BG vorgenommen wurde.The middle curve 27 with the unfilled squares relates to one Embodiment in which the maximum DC high voltage of High voltage electrode 10 to a maximum value HV-BG of 80 kV is limited, but no current limitation I-BG was made.

Die unterste Kurve 28 mit den schwarz ausgefüllten Dreiecken ergibt sich mit der vorstehend beschriebenen Schaltung nach der Erfindung, bei welcher sowohl der Sprühstrom als auch die Hochspannung je auf einen Maxiamalwert begrenzt sind. In Fig. 2 wurde angenommen, daß der Hochspannungsbegrenzungswert HV-BG 50 kV und der Sprühstrombegrenzungswert I-BG 20 µA (20 x 10-6 A) ist.The bottom curve 28 with the black triangles results with the circuit according to the invention described above, in which both the spray current and the high voltage are each limited to a maximum value. In Fig. 2 it was assumed that the high voltage limit value HV-BG is 50 kV and the spray current limit value I-BG is 20 µA (20 x 10 -6 A).

In Fig. 3 ist die Sprühvorrichtung 2 etwas detailierter dargestellt. Sie zeigt, daß eine oder mehrere Hochspannungselektroden 10 außerhalb oder innerhalb eines Beschichtungsmaterialkanals 30 angeordnet sein können. Ihm wird Beschichtungsmaterial, z. B. Beschichtungspulver, über eine Leitung 31, z. B. ein Schlauch, zugeführt. 3 shows the spray device 2 in somewhat more detail. It shows that one or more high voltage electrodes 10 outside or inside of a coating material channel 30 can be arranged. He will Coating material, e.g. B. coating powder, via a line 31, for. B. a hose fed.

Gemäß Fig. 3 kann die Sprühvorrichtung 2 mit an ein Bezugspotential, z. B. Erdpotential, angschlossenen Gegenelektroden 32 (Ableiterelektroden) versehen sein, welche freie elektrische Ladungen (Ionen, Elektronen), welche von den Elektroden 10 abgegeben werden, auffangen und auf Erdpotential ableiten. Es hat sich gezeigt, daß durch die Erfindung wesentlich weniger freie elektrische Teilchen entstehen, insbesondere freie Ionen, und damit auch ein geringerer Stromverlust.3, the spray device 2 with a reference potential, for. B. Earth potential, connected counter electrodes 32 (arrester electrodes) be provided, which free electrical charges (ions, electrons), which are emitted by the electrodes 10, collect and at ground potential deduce. It has been shown that the invention is much less free electrical particles are formed, especially free ions, and thus also a less power loss.

In Fig. 3 ist der Oszillator 14 über ein elektrisches Kabel 36 an den Hochspannungserzeuger 12 angeschlossen, welcher in die Sprühvorrichtung 2 integriert ist, jedoch auch getrennt von ihr, z. B. in der Regeleinrichtung 16 angeordnet werden könnte.In Fig. 3, the oscillator 14 via an electrical cable 36 to the High-voltage generator 12 connected, which in the spray device 2nd is integrated, but also separately from it, e.g. B. in the control device 16th could be arranged.

Claims (5)

Sprühbeschichtungseinrichtung, enthaltend eine Sprühvorrichtung (2) zum Sprühen von Beschichtungsmaterial auf zu beschichtende Gegenstände, einen Hochspannungserzeuger (12) zur Erzeugung von Hochspannung an mindestens einer Hochspannungselektrode (10) der Sprühvorrichtung (2), eine Regeleinrichtung (16) zur Regelung eines elektrischen Sprühstromes, welcher mit dem Beschichtungsmaterial von der Hochspannungselektrode zu einem zu beschichtenden Objekt fließt, wobei automatisch der Sprühstrom durch eine Sprühstrommesschaltung (24) gemessen und einem Stromanstieg durch eine Spannungsreduzierung entgegengewirkt wird, Mittel (18,20,22) zur Strombegrenzung und zur Hochspannungsbegrenzung je auf einen vorbestimmten Wert,
dadurch gekennzeichnet,
daß die Sprühstrommesschaltung (24) im elektrischen Rückstromweg von dem zu beschichtenden Objekt (6) zurück in die Regeleinrichtung (16) angeordnet ist, um dort den Sprühstrom zu messen.Spray coating device, comprising a spray device (2) for spraying coating material onto objects to be coated, a high voltage generator (12) for generating high voltage at at least one high voltage electrode (10) of the spray device (2), a regulating device (16) for regulating an electrical spray current, which flows with the coating material from the high-voltage electrode to an object to be coated, the spray current being automatically measured by a spray current measuring circuit (24) and counteracting an increase in current by reducing the voltage, means (18, 20, 22) for limiting the current and for limiting the high voltage each predetermined value,
characterized,
that the spray current measuring circuit (24) is arranged in the electrical return flow path from the object to be coated (6) back into the control device (16) in order to measure the spray current there. Sprühbeschichtungseinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Rückstromweg an Erdpotential (8) angeschlossen ist.Spray coating device according to claim 1,
characterized,
that the reverse current path is connected to earth potential (8). Sprühbeschichtungseinrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß der Strombegrenzungswert und/oder der Hochspannungsbegrenzungswert variabel einstellbar ist.Spray coating device according to claim 1 or 2,
characterized,
that the current limit value and / or the high voltage limit value is variably adjustable. Sprühbeschichtungseinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gennzeichnet,
daß ein Speicher (18) zur Speicherung von je mindestens einem Strombegrenzungswert (I-BG) und einem Hochspannungsbegrenzungswert (HV-BG) vorgesehen ist, wobei der Wert variabel einstellbar ist.Spray coating device according to one of the preceding claims,
characterized by
that a memory (18) is provided for storing at least one current limit value (I-BG) and one high-voltage limit value (HV-BG), the value being variably adjustable. Sprühbeschichtungsvorrichtung nach einem der vorhergehenen Ansprüch,
dadurch gekennzeichnet,
daß mindestens eine Gegenelektrode (32), die an ein von dem elektrischen Potential der Hochspannungselektrode (10) stark abweichendes Potential angeschlossen ist, an der Sprühvorrichtung (2) mit Abstand von der Hochspannungselektrode (10) außerhalb des Beschichtungsmaterialstromes zum Ableiten von freien Ionen und freien Elektronen vorgesehen ist, welche von der Hochspannungselektrode (10) erzeugt werden, jedoch mit dem Beschichtungsmaterial nicht auf das zu beschichtende Objekt fliegen.Spray coating device according to one of the preceding claims,
characterized,
that at least one counterelectrode (32), which is connected to a potential which differs greatly from the electrical potential of the high-voltage electrode (10), on the spray device (2) at a distance from the high-voltage electrode (10) outside the coating material flow for discharging free ions and free ions Electrons are provided which are generated by the high-voltage electrode (10) but do not fly with the coating material onto the object to be coated.
EP00110032A 1999-06-14 2000-05-12 Control for an electrostatic spray coating apparatus Expired - Lifetime EP1060795B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19926926 1999-06-14
DE19926926A DE19926926A1 (en) 1999-06-14 1999-06-14 Spray coating device

Publications (3)

Publication Number Publication Date
EP1060795A2 true EP1060795A2 (en) 2000-12-20
EP1060795A3 EP1060795A3 (en) 2003-05-21
EP1060795B1 EP1060795B1 (en) 2007-11-07

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Application Number Title Priority Date Filing Date
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US (2) US6537378B1 (en)
EP (1) EP1060795B1 (en)
JP (1) JP4638976B2 (en)
AT (1) ATE377453T1 (en)
CA (1) CA2311210C (en)
DE (2) DE19926926A1 (en)
DK (1) DK1060795T3 (en)
ES (1) ES2294985T3 (en)

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DE102009013561A1 (en) * 2009-03-17 2010-10-07 Dürr Systems GmbH Monitoring method and monitoring device for an electrostatic coating system
CN108816542B (en) * 2018-06-11 2021-01-15 佛山市优正涂装科技有限公司 Automatic regional power control method for electrostatic powder spray gun system

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US6656536B2 (en) 2003-12-02
US6537378B1 (en) 2003-03-25
JP4638976B2 (en) 2011-02-23
EP1060795B1 (en) 2007-11-07
DK1060795T3 (en) 2008-02-11
DE19926926A1 (en) 2000-12-21
US20030064167A1 (en) 2003-04-03
ATE377453T1 (en) 2007-11-15
JP2001025688A (en) 2001-01-30
ES2294985T3 (en) 2008-04-16
DE50014755D1 (en) 2007-12-20
EP1060795A3 (en) 2003-05-21
CA2311210C (en) 2005-08-09
CA2311210A1 (en) 2000-12-14

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