EP1208915B1 - Method and device for transfering electroconductive paints between locations with different potentials - Google Patents

Method and device for transfering electroconductive paints between locations with different potentials Download PDF

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Publication number
EP1208915B1
EP1208915B1 EP01127818A EP01127818A EP1208915B1 EP 1208915 B1 EP1208915 B1 EP 1208915B1 EP 01127818 A EP01127818 A EP 01127818A EP 01127818 A EP01127818 A EP 01127818A EP 1208915 B1 EP1208915 B1 EP 1208915B1
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EP
European Patent Office
Prior art keywords
varnish
conveying
conveying line
line
consumer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01127818A
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German (de)
French (fr)
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EP1208915A2 (en
EP1208915A3 (en
Inventor
Winfried Ott
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Lactec GmbH GesellschaftfFuer Moderne Lackiertechnik
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Lactec GmbH GesellschaftfFuer Moderne Lackiertechnik
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Publication of EP1208915A3 publication Critical patent/EP1208915A3/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—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
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1481—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet comprising pigs, i.e. movable elements sealingly received in supply pipes, for separating different fluids, e.g. liquid coating materials from solvent or air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/149—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet characterised by colour change manifolds or valves therefor

Definitions

  • the invention relates to a method for conveying electrically conductive paints from a supply system lying at ground potential, in particular a color changer, to a high-voltage consumer, in particular an electrostatic paint sprayer.
  • the invention has for its object to provide a simple structured method that requires a relatively low control effort and is also suitable for automatic quick color change systems.
  • the invention also relates to an apparatus for carrying out this method according to claim 5.
  • the aforementioned invention task namely to provide a device which is relatively simple, manages with a low control effort and is also useful for automatic quick color change systems.
  • the paint is discontinuously conveyed in individual quantities, wherein measured in the conveying direction longitudinal extent of the individual paint packages is considerably less than the length of the conveying path or the insulating conveying line, so that within this always a sufficient insulating gap remains. Because of this measure, the individual quantities of paint or paint packages can be easily transported in the high voltage range, for example by means of compressed air or an insulating liquid as a sliding medium, as described below with reference to the embodiment. Since the separation of the amounts of paint does not cause any difficulties, the inventive method and the associated device prove to be appropriate, simple and reliable.
  • the discontinuous transfer of the individual paint amounts requires at least partial buffering of the paint in the high-voltage range if the consumer is to be supplied continuously. Such caching can be avoided, however, if according to a particularly useful version, the divided quantities of paint are supplied via two conveyor lines or by two parallel conveyor lines, the paint delivery without interruption takes place alternately from the paint amounts of one and the other conveyor line or conveyor line.
  • the conveying device 1 comprises a conveying line 2 with a feeding station 3 near the rear line end 4 and a dispensing station 5 near the front line end 6.
  • the conveying line 2 is made of an electrically insulating material, eg plastic, and has between the loading station 3 and the dispensing station 5 a comparatively long length L on.
  • a discharge line 11 is connected to the delivery line 2 with a dispensing valve 12.
  • the discharge line 11 leads via a metering device 13 to a consumer 14, which is formed here by an electrostatic paint sprayer 15. At this high voltage is applied, so that a high voltage range indicated by dashed lines 16 is present, in which also the discharge station 5 falls.
  • the feeding system 7 and the feeding station 3 are located to earth potential, as indicated by a corresponding symbol.
  • a pair of pigs 17 is arranged with a rear pig 18 and a front pig 19, which can move like a piston in the longitudinal direction through the line 2, but completely fill their cross-section and so a dimensionally stable separator for on opposite sides in form the delivery line 2 located media.
  • the pigs 18 and 19 are held by a spacer 20 at a minimum distance from each other, as it FIG. 1 shows.
  • the two pigs 17, 18 occupy a greater distance from each other to accommodate a certain amount of paint 21 between them.
  • Such a quantity of paint 21 takes within the delivery line 2 a length l. It is important that this length l and thus the amount of paint 21 is not too large, so that the delivery line 2 still has a sufficient insulating length Ll, which prevents penetration of the high voltage from the high voltage region 16 to the charging station 3.
  • a compressed air line 24 is connected to the rear end 4 of the delivery line 2, which is connected via a compressed air valve 25 to a compressed air source 26 and provided with a vent valve 27 which is opened for the return transport of the pig pair 17 from the discharge station 5 to the loading station 3.
  • a return transport device 28 is otherwise provided, which is connected to the front end 6 of the delivery line 2 and formed otherwise as the transport device 23.
  • the return conveyor 28 comprises a compressed air line 29 with a compressed air valve 30 which is connected to a compressed air source 31 and provided with a vent valve 33.
  • the feed line 2 in the region of the feed station 3 is assigned a feed sensor 33 and in the region of the discharge station 5 a feed sensor 34. These sensors respond to the presence of pig pair 17 or package 22 in the sensor area.
  • a further parallel delivery line 2 ' is provided, which is equipped and connected in completely the same way as the delivery line 2, so apart from a detailed description and the same reference numerals an attached distinguishing mark.
  • the delivery line 2 ' is connected to the same color changer 8 and to the same common delivery line 11.
  • FIG. 1 are at the start of the pushed pig pairs 17 and 17 'in the feed station 3 and 3' of the delivery line 2 and 2 '.
  • the feed valve 10 is opened until the intended amount of paint 21 is introduced between the pigs 18, 19 and this has spread to the length 1, as it is made FIG. 2 is apparent.
  • FIG. 2 advances by 25 compressed air is brought behind the rear pig 18 by opening the compressed air valve, wherein at the same time the discharge-side vent valve 32 is opened.
  • FIG. 3 shows the package 22 with the amount of liquid 21 midway, now dividing the existing insulating distance Ll on two Isolierumblen before and behind the amount of liquid 21.
  • the package 22 'in the feed station 3' has been completed in the delivery line 2 '.
  • FIG. 4 is the paint package 22 arrived at the dispensing station 5, where it rests itself due to contact with high voltage. This arrival at the dispensing station 5 is detected by the dispensing sensor 34, whereupon the dispensing valve 12 is opened, so that the paint via the discharge line 11 according to the default by the metering device 13 slowly flows to the atomizer 15. According to FIG. 4 is a part of the amount of liquid 21 is already discharged, while the package 22 'with the amount of liquid 21' on the way to the dispensing station 5 ', for which the transport device 23' has been operated accordingly.
  • the dispensing sensor 34 in accordance with the forward movement of the rear pig 18 continuing to dispense the paint, determines the end of the depletion from the package 22, whereupon the controller closes the dispensing valve 12 and opens the dispensing valve 12 'so that now the atomizer 15 is clear of the paint amount 21 'continues to be supplied.
  • the pair of pigs 17 is moved back from the discharge station 5 in the loading station 3, as indicated by the arrow 35 in FIG. 5 is indicated.
  • the compressed air valve 25 are closed at the transport device 23 and the vent valve 27 is opened, while conversely at the return conveyor 28, the compressed air valve 30 is opened and the vent valve 32 are closed.
  • the state is again reached with regard to the delivery line 2, as it is in FIG. 1 is shown. It repeats the process already described, in which by a limited opening of the supply valve 10, a further amount of paint 21 is introduced between the pigs 18 and 19, which in turn takes place in the manner described, the transport to the dispensing station 5. In this case, the further amount of paint 21 also arrives at the dispensing station 5, before the amount of paint 21 'is completely discharged in the delivery station 5'.
  • FIG. 6 shows that the two pigs 18 and 19 are each formed in the same way and consist of a core 36 with a sheath 37 made of a plastic.
  • the spacer 20 is formed from a projecting from the pig 19 concentric to the delivery line 2 rod 38 with a rounded head 39.
  • the spacer 20 forms a spacer which prevents the collars 18 and 19 from colliding and sticking together when the pigs are pressed back.
  • the spacer 20 in the charging station 3 for the filling of the space sufficient distance between the two pigs 18, 19 always guaranteed.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Threshing Machine Elements (AREA)
  • Non-Mechanical Conveyors (AREA)

Abstract

The method involves separating individual quantities of paint and moving them in spatial and time intervals along a transport path between the delivery system and the consuming device (15), whereby the length (L) of the transport path exceeds the extent (l) of the individual quantities of paint (2l) in the transport direction by an amount sufficient as an isolating distance. Independent claims are also included for the following: an arrangement for implementing the method.

Description

Die Erfindung betrifft ein Verfahren zum Fördern von elektrisch leitfähigen Lacken von einem an Erdpotential liegenden Zuführsystem, insbesondere einem Farbwechsler, zu einem an Hochspannung liegenden Verbraucher, insbesondere einem elektrostatischen Lackzerstäuber.The invention relates to a method for conveying electrically conductive paints from a supply system lying at ground potential, in particular a color changer, to a high-voltage consumer, in particular an electrostatic paint sprayer.

Die elektrostatische Verarbeitung von elektrisch hoch leitfähigen Lacken, z.B. Wasserlacken, macht es erforderlich, den Lack von Erdpotenzial auf Hochspannungspotenzial zu transferieren, wobei eine elektrische Isolierung zwischen den Potenzialen gewährleistet sein muß.The electrostatic processing of highly electrically conductive paints, e.g. Water-based paints, it is necessary to transfer the paint from ground potential to high-voltage potential, with an electrical insulation must be ensured between the potentials.

Zu diesem Zweck sind verschiedene Verfahrensweisen bekannt und beispielsweise in US 5 632 816 oder DE 197 56 488 beschrieben, wo mit einer Lackzuführungslanze gearbeitet wird, die durch eine isolierende Flüssigkeit hindurch in die Lackabgabestellung hinein bewegt wird.For this purpose, various procedures are known and, for example, in US 5,632,816 or DE 197 56 488 described where working with a paint feed lance, which is moved through an insulating liquid into the paint delivery position inside.

Aus der nicht vorveröffentlichten EP1172152 ist ein Verfahren zum Fördern von elektrisch leitfähigen Lacken von einem an Erdpotential liegenden Zuführungsystem zu einem an Hochspannung liegenden Verbraucher (14) bekannt, bei dem einzelne abgeteilte Lackmengen und ein isolierendes Schiebemedium in räumlichem wie zeitlichem Abstand durch eine Förderleitung zwischen dem Zuführungsystem und dem Verbraucher bewegt werden.From the not pre-published EP1172152 For example, there is known a method of conveying electrically conductive paints from a grounding supply system to a high voltage consumer (14) in which individual discrete amounts of varnish and an insulating thrust medium are moved in spatial and temporal intervals through a delivery line between the delivery system and the consumer become.

Den bekannten Verfahren ist gemeinsam, daß sie entweder sehr komplexe Steuerungs- bzw. Überwachungsfunktionen erfordern oder im Zusammenhang mit automatischen Schnellfarbwechselsystemen nicht eingesetzt werden können.The known methods have in common that they either require very complex control or monitoring functions or can not be used in connection with automatic rapid color change systems.

Dementsprechend liegt der Erfindung die Aufgabe zugrunde, ein einfach strukturiertes Verfahren vorzusehen, das einen vergleichsweise geringen Steuerungsaufwand erfordert und auch für automatische Schnellfarbwechselsysteme geeignet ist.Accordingly, the invention has for its object to provide a simple structured method that requires a relatively low control effort and is also suitable for automatic quick color change systems.

Diese Aufgabe wird erfindungsgemäß durch das in Anspruch 1 definierte Verfahren gelöst.This object is achieved by the method defined in claim 1.

Die Erfindung bezieht sich auch auf eine Vorrichtung zur Durchführung dieses Verfahrens gemäß Anspruch 5..The invention also relates to an apparatus for carrying out this method according to claim 5.

Auch insoweit gilt die vorgenannte Erfindungsaufgabe, nämlich eine Vorrichtung zu schaffen, die vergleichsweise einfach ausgebildet ist, mit einem geringen Steuerungsaufwand auskommt und auch für automatische Schnellfarbwechselsysteme brauchbar ist.Also in this respect, the aforementioned invention task, namely to provide a device which is relatively simple, manages with a low control effort and is also useful for automatic quick color change systems.

Zweckmäßige Ausgestaltungen und Weiterbildungen des Verfahrens und der Vorrichtung ergeben sich aus den Unteransprüchen.Advantageous embodiments and further developments of the method and the device will become apparent from the dependent claims.

Erfindungsgemäß wird somit der Lack diskontinuierlich in Einzelmengen gefördert, wobei die in Förderrichtung gemessene Längserstreckung der einzelnen Lackpakete erheblich unter der Länge der Förderstrecke bzw. der isolierenden Förderleitung liegt, so daß innerhalb dieser stets eine ausreichende Isolierstrecke verbleibt. Wegen dieser Maßnahme lassen sich die einzelnen Lackmengen oder Lackpakete problemlos in den Hochspannungsbereich transportieren, beispielsweise mittels Druckluft oder einer Isolierflüssigkeit als Schiebemedium, wie es nachfolgend anhand des Ausführungsbeispiels geschildert ist. Da auch das Abteilen der Lackmengen keine Schwierigkeiten macht, erweisen sich das erfindungsgemäße Verfahren und die zugehörige Vorrichtung als zweckentsprechend, einfach und betriebssicher.According to the invention thus the paint is discontinuously conveyed in individual quantities, wherein measured in the conveying direction longitudinal extent of the individual paint packages is considerably less than the length of the conveying path or the insulating conveying line, so that within this always a sufficient insulating gap remains. Because of this measure, the individual quantities of paint or paint packages can be easily transported in the high voltage range, for example by means of compressed air or an insulating liquid as a sliding medium, as described below with reference to the embodiment. Since the separation of the amounts of paint does not cause any difficulties, the inventive method and the associated device prove to be appropriate, simple and reliable.

Die diskontinuierliche Überführung der einzelnen Lackmengen setzt eine zumindest teilweise Zwischenspeicherung des Lacks im Hochspannungsbereich voraus, falls der Verbraucher kontinuierlich beliefert werden soll. Eine solche Zwischenspeicherung läßt sich jedoch vermeiden, wenn entsprechend einer besonders zweckmäßigen Version die abgeteilten Lackmengen über zwei Förderstrecken bzw. durch zwei parallele Förderleitungen zugeführt werden, wobei die Lackabgabe unterbrechungsfrei im Wechsel aus den Lackmengen der einen und der anderen Förderstrecke bzw. Förderleitung erfolgt.The discontinuous transfer of the individual paint amounts requires at least partial buffering of the paint in the high-voltage range if the consumer is to be supplied continuously. Such caching can be avoided, however, if according to a particularly useful version, the divided quantities of paint are supplied via two conveyor lines or by two parallel conveyor lines, the paint delivery without interruption takes place alternately from the paint amounts of one and the other conveyor line or conveyor line.

Zwei Ausführungsbeispiele der Erfindung werden nachfolgend anhand einer schematischen Zeichnung näher erläutert. Es zeigen:

Figuren 1 - 5
dieselbe Lackfördervorrichtung mit zwei parallelen Förderleitungen zwischen einem Farbwechsler und einem unter Hochspannung stehenden elektrostatischen Lackzerstäuber, wobei die einzelnen Figuren unterschiedliche Betriebsstadien wiedergeben;
Figur 6
in einer vergrößerten Darstellung ein bei der Vorrichtung verwendetes Molchpaar mit einem zwischenliegenden Distanzstück;
Two embodiments of the invention will be explained in more detail with reference to a schematic drawing. Show it:
Figures 1 - 5
the same paint conveying device with two parallel conveying lines between a color changer and a standing under high voltage electrostatic paint sprayer, the individual figures represent different stages of operation;
FIG. 6
in an enlarged view, a pig pair used in the device with an intermediate spacer;

Gemäß Figur 1 umfaßt die Fördervorrichtung 1 eine Förderleitung 2 mit einer Beschickungsstation 3 nahe dem hinteren Leitungsende 4 und einer Abgabestation 5 nahe dem vorderen Leitungsende 6. Die Förderleitung 2 ist aus einem elektrisch isolierenden Werkstoff, z.B. Kunststoff, hergestellt und weist zwischen der Beschickungsstation 3 und der Abgabestation 5 eine vergleichsweise große Länge L auf.According to FIG. 1 The conveying device 1 comprises a conveying line 2 with a feeding station 3 near the rear line end 4 and a dispensing station 5 near the front line end 6. The conveying line 2 is made of an electrically insulating material, eg plastic, and has between the loading station 3 and the dispensing station 5 a comparatively long length L on.

Ein Zuführsystem 7 für Lack, das als automatischer Farbwechsler 8 ausgebildet ist, ist über eine Zuführleitung 9 mit einem Zuführventil 10 in der Beschickungsstation 3 an die Förderleitung 2 angeschlossen.A paint delivery system 7, which is designed as an automatic color changer 8, is connected to the delivery line 2 via a supply line 9 with a supply valve 10 in the charging station 3.

In der Abgabestation 5 ist an die Förderleitung 2 eine Abgabeleitung 11 mit einem Abgabeventil 12 angeschlossen. Die Abgabeleitung 11 führt über eine Dosiereinrichtung 13 zu einem Verbraucher 14, der hier von einem elektrostatischen Lackzerstäuber 15 gebildet ist. An diesem liegt Hochspannung an, so daß ein gestrichelt angedeuteter Hochspannungsbereich 16 vorhanden ist, in den auch noch die Abgabestation 5 fällt. Demgegenüber befinden sich das Zuführsystem 7 und die Beschickungsstation 3 auf Erdpotenzial, wie es durch ein entsprechendes Symbol angedeutet ist.In the delivery station 5, a discharge line 11 is connected to the delivery line 2 with a dispensing valve 12. The discharge line 11 leads via a metering device 13 to a consumer 14, which is formed here by an electrostatic paint sprayer 15. At this high voltage is applied, so that a high voltage range indicated by dashed lines 16 is present, in which also the discharge station 5 falls. On the other hand, the feeding system 7 and the feeding station 3 are located to earth potential, as indicated by a corresponding symbol.

In der Förderleitung 2 ist ein Molchpaar 17 mit einem hinteren Molch 18 und einem vorderen Molch 19 angeordnet, die sich wie ein Kolben in Längsrichtung durch die Leitung 2 bewegen können, ihren Querschnitt jedoch vollständig ausfüllen und so ein formstabiles Trennelement für die auf gegenüberliegenden Seiten in der Förderleitung 2 befindlichen Medien bilden. Die Molche 18 und 19 sind durch ein Distanzstück 20 in einem Mindestabstand zueinander gehalten, wie es Figur 1 zeigt. Entsprechend Figur 2 können die beiden Molche 17, 18 jedoch einen größeren Abstand zueinander einnehmen, um zwischen sich eine bestimmte Lackmenge 21 aufzunehmen. Eine solche Lackmenge 21 nimmt innerhalb der Förderleitung 2 eine Länge l ein. Wichtig ist, daß diese Länge l und damit die Lackmenge 21 nicht zu groß gewählt wird, so daß die Förderleitung 2 noch eine ausreichende Isolierlänge L-l aufweist, die ein Durchschlagen der Hochspannung vom Hochspannungsbereich 16 zur Beschickungsstation 3 verhindert.In the feed line 2, a pair of pigs 17 is arranged with a rear pig 18 and a front pig 19, which can move like a piston in the longitudinal direction through the line 2, but completely fill their cross-section and so a dimensionally stable separator for on opposite sides in form the delivery line 2 located media. The pigs 18 and 19 are held by a spacer 20 at a minimum distance from each other, as it FIG. 1 shows. Corresponding FIG. 2 However, the two pigs 17, 18 occupy a greater distance from each other to accommodate a certain amount of paint 21 between them. Such a quantity of paint 21 takes within the delivery line 2 a length l. It is important that this length l and thus the amount of paint 21 is not too large, so that the delivery line 2 still has a sufficient insulating length Ll, which prevents penetration of the high voltage from the high voltage region 16 to the charging station 3.

Die Lackmenge 21 bildet zusammen mit den sie einschließenden Molchen 18, 19 ein Paket 22, das mittels einer in Förderrichtung durch die Leitung 2 wirkenden Transporteinrichtung 23 von der Beschickungsstation 3 zur Abgabestation 5 verlagerbar ist. Dazu ist an das hintere Ende 4 der Förderleitung 2 eine Druckluftleitung 24 angeschlossen, die über ein Druckluftventil 25 mit einer Druckluftquelle 26 verbunden und mit einem Entlüftungsventil 27 versehen ist, das für den Rücktransport des Molchpaars 17 von der Abgabestation 5 zur Beschickungsstation 3 geöffnet wird.The quantity of paint 21, together with the pigs 18, 19 enclosing it, forms a package 22 which can be displaced from the charging station 3 to the delivery station 5 by means of a transport device 23 acting in the conveying direction through the line 2. For this purpose, a compressed air line 24 is connected to the rear end 4 of the delivery line 2, which is connected via a compressed air valve 25 to a compressed air source 26 and provided with a vent valve 27 which is opened for the return transport of the pig pair 17 from the discharge station 5 to the loading station 3.

Für diese Rückführung des Molchpaars 17 von der Abgabestation 5 zur Beschickungsstation 3 ist im übrigen eine Rücktransporteinrichtung 28 vorgesehen, die an das vordere Ende 6 der Förderleitung 2 angeschlossen und im übrigen wie die Transporteinrichtung 23 ausgebildet ist. Dementsprechend umfaßt die Rücktransporteinrichtung 28 eine Druckluftleitung 29 mit einem Druckluftventil 30, die an eine Druckluftquelle 31 angeschlossen und mit einem Entlüftungsventil 33 versehen ist.For this return of the pair of pigs 17 from the delivery station 5 to the loading station 3, a return transport device 28 is otherwise provided, which is connected to the front end 6 of the delivery line 2 and formed otherwise as the transport device 23. Accordingly, the return conveyor 28 comprises a compressed air line 29 with a compressed air valve 30 which is connected to a compressed air source 31 and provided with a vent valve 33.

Des weiteren sind der Förderleitung 2 im Bereich der Beschickungsstation 3 ein Beschickungssensor 33 und im Bereich der Abgabestation 5 ein Abgabesensor 34 zugeordnet. Diese Sensoren sprechen auf das Vorhandensein des Molchpaars 17 bzw. des Pakets 22 im Sensorbereich an.Furthermore, the feed line 2 in the region of the feed station 3 is assigned a feed sensor 33 and in the region of the discharge station 5 a feed sensor 34. These sensors respond to the presence of pig pair 17 or package 22 in the sensor area.

Wie die Figuren zeigen, ist nicht nur eine einzige Förderleitung 2 sondern eine weitere parallele Förderleitung 2' vorgesehen, die in völlig gleicher Weise wie die Förderleitung 2 ausgestattet und angeschlossen ist, so daß von einer ins einzelne gehenden Beschreibung abgesehen wird und die gleichen Bezugszeichen mit einem angefügten Unterscheidungsstrich verwendet werden. Die Förderleitung 2' ist an denselben Farbwechsler 8 sowie an dieselbe gemeinsame Abgabeleitung 11 angeschlossen.As the figures show, not only a single delivery line 2 but a further parallel delivery line 2 'is provided, which is equipped and connected in completely the same way as the delivery line 2, so apart from a detailed description and the same reference numerals an attached distinguishing mark. The delivery line 2 'is connected to the same color changer 8 and to the same common delivery line 11.

Nachfolgend wird anhand der Figuren 1 bis 5 die Arbeitsweise der Vorrichtung 1 beschrieben:The following is based on the FIGS. 1 to 5 the operation of the device 1 described:

Gemäß Figur 1 befinden sich beim Start die zusammengeschobenen Molchpaare 17 bzw. 17' in der Beschickungsstation 3 bzw. 3' der Förderleitung 2 bzw. 2'. Zunächst wird das Zuführventil 10 geöffnet, bis die vorgesehene Lackmenge 21 zwischen die Molche 18, 19 eingeleitet ist und diese auf die Länge 1 gespreizt hat, wie es aus Figur 2 ersichtlich ist. Dort ist auch bereits mit dem Einleiten von Lack in den Zwischenraum des Molchpaars 17' begonnen worden.According to FIG. 1 are at the start of the pushed pig pairs 17 and 17 'in the feed station 3 and 3' of the delivery line 2 and 2 '. First, the feed valve 10 is opened until the intended amount of paint 21 is introduced between the pigs 18, 19 and this has spread to the length 1, as it is made FIG. 2 is apparent. There is also already started with the introduction of paint in the space of the pig pair 17 '.

Nunmehr wird das Paket 22 gemäß Figur 2 vorbewegt, indem durch Öffnen des Druckluftventils 25 Druckluft hinter den hinteren Molch 18 gebracht wird, wobei gleichzeitig das abgabeseitige Entlüftungsventil 32 geöffnet wird. Figur 3 zeigt das Paket 22 mit der Flüssigkeitsmenge 21 auf halbem Wege, wobei sich nunmehr die vorhandene Isolierstrecke L-l auf zwei Isolierstrecken vor und hinter der Flüssigkeitsmenge 21 aufteilt. Gleichzeitig ist in der Förderleitung 2' das Paket 22' in der Beschickungsstation 3' fertig gestellt worden.Now, the packet 22 is according to FIG. 2 advances by 25 compressed air is brought behind the rear pig 18 by opening the compressed air valve, wherein at the same time the discharge-side vent valve 32 is opened. FIG. 3 shows the package 22 with the amount of liquid 21 midway, now dividing the existing insulating distance Ll on two Isolierstrecken before and behind the amount of liquid 21. At the same time, the package 22 'in the feed station 3' has been completed in the delivery line 2 '.

Gemäß Figur 4 ist das Lackpaket 22 an der Abgabestation 5 eingetroffen, wo es kontaktbedingt selbst an Hochspannung anliegt. Dieses Eintreffen an der Abgabestation 5 wird durch den Abgabesensor 34 festgestellt, worauf das Abgabeventil 12 geöffnet wird, so daß der Lack über die Abgabeleitung 11 entsprechend der Vorgabe durch die Dosiereinrichtung 13 langsam zum Zerstäuber 15 fließt. Gemäß Figur 4 ist ein Teil der Flüssigkeitsmenge 21 bereits abgegeben, während sich das Paket 22' mit der Flüssigkeitsmenge 21' unterwegs zur Abgabestation 5' befindet, wozu die Transporteinrichtung 23' entsprechend betätigt wurde.According to FIG. 4 is the paint package 22 arrived at the dispensing station 5, where it rests itself due to contact with high voltage. This arrival at the dispensing station 5 is detected by the dispensing sensor 34, whereupon the dispensing valve 12 is opened, so that the paint via the discharge line 11 according to the default by the metering device 13 slowly flows to the atomizer 15. According to FIG. 4 is a part of the amount of liquid 21 is already discharged, while the package 22 'with the amount of liquid 21' on the way to the dispensing station 5 ', for which the transport device 23' has been operated accordingly.

Bevor die Lackmenge 21 bis auf einen zwischen den Molchen 18, 19 verbleibenden Rest vollständig abgegeben ist, ist das Paket 22' mit der Lackmenge 21' in der Abgabestation 5' eingetroffen, so daß die Lackabgabe kontinuierlich fortgesetzt werden kann. Der Abgabesensor 34 stellt entsprechend der beim Abgeben des Lacks fortgesetzten Vorwärtsbewegung des hinteren Molchs 18 das Ende der Entleerung aus dem Paket 22 fest, worauf die Steuereinrichtung das Abgabeventil 12 schließt und das Abgabeventil 12' öffnet, so daß nunmehr der Zerstäuber 15 aus der Lackmenge 21' weiterversorgt wird.Before the amount of paint 21 is completely dispensed to a remaining between the pigs 18, 19 rest, the package 22 'with the amount of paint 21' in the delivery station 5 'has arrived, so that the paint delivery can be continued continuously. The dispensing sensor 34, in accordance with the forward movement of the rear pig 18 continuing to dispense the paint, determines the end of the depletion from the package 22, whereupon the controller closes the dispensing valve 12 and opens the dispensing valve 12 'so that now the atomizer 15 is clear of the paint amount 21 'continues to be supplied.

Nunmehr wird das Molchpaar 17 von der Abgabestation 5 in die Beschickungsstation 3 zurückbewegt, wie es durch den Pfeil 35 in Figur 5 angedeutet ist. Dazu werden an der Transporteinrichtung 23 das Druckluftventil 25 geschlossen und das Entlüftungsventil 27 geöffnet, während umgekehrt an der Rücktransporteinrichtung 28 das Druckluftventil 30 geöffnet und das Entlüftungsventil 32 geschlossen werden.Now the pair of pigs 17 is moved back from the discharge station 5 in the loading station 3, as indicated by the arrow 35 in FIG FIG. 5 is indicated. For this purpose, the compressed air valve 25 are closed at the transport device 23 and the vent valve 27 is opened, while conversely at the return conveyor 28, the compressed air valve 30 is opened and the vent valve 32 are closed.

Nach dem vom Beschickungssensor 33 festgestellten Eintreffen des Molchpaars 17 in der Beschickungsstation 3 ist hinsichtlich der Förderleitung 2 der Zustand wieder erreicht, wie er in Figur 1 dargestellt ist. Es wiederholt sich der bereits beschriebene Vorgang, bei dem durch ein begrenztes Öffnen des Zuführventils 10 eine weitere Lackmenge 21 zwischen die Molche 18 und 19 eingebracht wird, worauf wiederum in der beschriebenen Weise der Transport zur Abgabestation 5 erfolgt. Dabei trifft die weitere Lackmenge 21 gleichfalls an der Abgabestation 5 ein, bevor die Lackmenge 21' in der Abgabestation 5' vollständig abgegeben ist.After the arrival of the pair of pigs 17 in the charging station 3, as determined by the charging sensor 33, the state is again reached with regard to the delivery line 2, as it is in FIG. 1 is shown. It repeats the process already described, in which by a limited opening of the supply valve 10, a further amount of paint 21 is introduced between the pigs 18 and 19, which in turn takes place in the manner described, the transport to the dispensing station 5. In this case, the further amount of paint 21 also arrives at the dispensing station 5, before the amount of paint 21 'is completely discharged in the delivery station 5'.

Figur 6 zeigt, daß die beiden Molche 18 und 19 jeweils in gleicher Weise ausgebildet sind und aus einem Kern 36 mit einer Ummantelung 37 aus einem Kunststoff bestehen. Das Distanzstück 20 ist aus einer vom Molch 19 konzentrisch zur Förderleitung 2 vorragenden Stange 38 mit einem gerundeten Kopfstück 39 gebildet. Das Distanzstück 20 bildet einen Abstandhalter, der verhindert, daß beim Zurückdrücken der Molche 18 und 19 diese aufeinanderstoßen und zusammenkleben. Außerdem ist durch das Distanzstück 20 in der Beschickungsstation 3 ein für das Befüllen des Zwischenraums ausreichender Abstand der beiden Molche 18, 19 immer gewährleistet. FIG. 6 shows that the two pigs 18 and 19 are each formed in the same way and consist of a core 36 with a sheath 37 made of a plastic. The spacer 20 is formed from a projecting from the pig 19 concentric to the delivery line 2 rod 38 with a rounded head 39. The spacer 20 forms a spacer which prevents the collars 18 and 19 from colliding and sticking together when the pigs are pressed back. In addition, by the spacer 20 in the charging station 3 for the filling of the space sufficient distance between the two pigs 18, 19 always guaranteed.

Claims (11)

  1. A method for conveying electrically conductive varnishes from a feeding system (7) lying on ground potential, in particular a color changer (8), to a consumer (14) lying on high voltage, in particular an electrostatic varnish sprayer (15), wherein individual separated varnish quantities (21) and compressed air as an insulating pushing agent are moved at space and time intervals through a conveying line (2, 2') between the feeding system (7) and the consumer (14), the length (L) of the conveying distance of the conveying line (2, 2') exceeding the extension (1) of the individual varnish quantities (21) in conveying direction by an amount (L-I) which is a sufficient insulating distance, and the compressed air being conveyed back, after arrival of the varnish quantity (21) in a discharging station (5), in the respective conveying line (2, 2').
  2. The method according to claim 1, characterized in that it is carried out in such a way that at no moment in time, more than a single separated varnish quantity (21) is present inside the respective conveying line (2, 2').
  3. The method according to claim 1 or 2, characterized in that separated varnish quantities (21, 21') are fed to the consumer (14) via at least two parallel conveying lines (2, 2').
  4. The method according to claim 3, characterized in that, for a continuous supply of the consumer (14), varnish quantities (21 and 21') are conveyed to the consumer (14) in a dosed manner alternately from one and from the other conveying line (2, 2').
  5. A device for carrying out the method according to claim 1, having a conveying line (2) for varnish, inserted into the connection between a grounded feeding system (7), in particular a color changer (8), and a consumer (14) lying on high voltage, in particular an electrostatic sprayer (15), the conveying line (2) consisting of an insulating material, at least one scraper pair (17) consisting of a rear scraper (18) and a front scraper (19) being arranged in the conveying line (2), a charging station (3) for feeding separated varnish quantities (21) between the two scrapers (18, 19) being associated to the rear end (4) of the conveying line (2), a discharging station (5) for sluicing the separated varnish quantities (21) out of the conveying line (2) being associated to the front end (4) of the conveying line (2), a transport device (23, 40) for shifting the scraper pair (17) with a picked-up varnish quantity (21) by means of compressed air as an insulating pushing agent from the charging station (3) to the discharging station (5) as well as a conveying-back device (28) for shifting the scraper pair (17) from the discharging station (5) to the charging station (3) being provided, the length (L) of the conveying line (2) between the charging station (3) and the discharging station (5) and the length (I) of the varnish-quantity package (22) picked up between the scrapers (18, 19) being dimensioned such that the added conveying-line sections in front of and behind the varnish-quantity package (22) always form an insulating distance of sufficient length (L-I) between the charging station (3) and the discharging station (5), and the conveying line being designed for conveying the compressed air back after having discharged the varnish quantity (21).
  6. The device according to claim 5, characterized in that a rear stop (at 4) and a front stop (at 6) are provided for the scraper pair (17) shifted in a reciprocating manner through the conveying line (2) by means of the transport devices (23, 28; 40).
  7. The device according to claim 5 or 6, characterized in that between the two scrapers (18, 19), a spacer (20) is provided, preventing a direct contact between the scrapers (18, 19).
  8. The device according to any of claims 5 to 7, characterized in that a control device is provided, including one or more rear sensors (33) associated to the charging station (3) and one or more front sensors (34) associated to the discharging station (5), each of said sensors responding to the scraper pair (17) passing by.
  9. The device according to any of claims 5 to 8, characterized in that the transport devices (23) are formed by a valve-controlled compressed-air line (24) connected to the rear end (4) of the conveying line (2) and a ventilating valve (27) and the conveying-back device (28) is formed by a valve-controlled compressed-air line (29) connected to the front end (6) of the conveying line (2) and a ventilating valve (32).
  10. The device according to any of claims 5 to 9, characterized in that two parallel conveying lines (2 and 2') are associated to the consumer (14) and that a control device is provided, by means of which varnish-quantity packages (22 and 22') are transported offset against each other through the two conveying lines (2, 2').
  11. The device according to any of claims 8 to 10, characterized in that a dosing device (13) for a controlled discharge of varnish is installed in the discharging line (11) connecting the conveying line (2) with the consumer (14).
EP01127818A 2000-11-28 2001-11-22 Method and device for transfering electroconductive paints between locations with different potentials Expired - Lifetime EP1208915B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10059041A DE10059041C2 (en) 2000-11-28 2000-11-28 Method and device for conveying electrically conductive paints between different voltage potentials
DE10059041 2000-11-28

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EP1208915A2 EP1208915A2 (en) 2002-05-29
EP1208915A3 EP1208915A3 (en) 2004-01-02
EP1208915B1 true EP1208915B1 (en) 2010-03-24

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EP01127818A Expired - Lifetime EP1208915B1 (en) 2000-11-28 2001-11-22 Method and device for transfering electroconductive paints between locations with different potentials

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US (1) US6589348B2 (en)
EP (1) EP1208915B1 (en)
AT (1) ATE461750T1 (en)
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Publication number Publication date
DE50115402D1 (en) 2010-05-06
EP1208915A2 (en) 2002-05-29
ATE461750T1 (en) 2010-04-15
US20020064601A1 (en) 2002-05-30
DE10059041A1 (en) 2002-06-06
EP1208915A3 (en) 2004-01-02
DE10059041C2 (en) 2002-11-14
US6589348B2 (en) 2003-07-08

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