EP1172152B1 - Paint supply system with piggable supply lines for an electrostatic coating device - Google Patents

Paint supply system with piggable supply lines for an electrostatic coating device Download PDF

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Publication number
EP1172152B1
EP1172152B1 EP01114338A EP01114338A EP1172152B1 EP 1172152 B1 EP1172152 B1 EP 1172152B1 EP 01114338 A EP01114338 A EP 01114338A EP 01114338 A EP01114338 A EP 01114338A EP 1172152 B1 EP1172152 B1 EP 1172152B1
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EP
European Patent Office
Prior art keywords
pig
coating
supply
medium
ms2b
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Expired - Lifetime
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EP01114338A
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German (de)
French (fr)
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EP1172152A1 (en
Inventor
Michael Baumann
Thomas Hezel
Kurt Vetter
Frank Herre
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Duerr Systems AG
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Duerr Systems 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
    • 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
    • B05B5/1625—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 the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • B05B5/1633—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 the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom the arrangement comprising several supply lines arranged in parallel, each comprising such an intermediate container
    • 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

Definitions

  • the invention relates to a method for supplying a coating member and a supply system for the particular electrostatic serial coating of workpieces such as For example, vehicle bodies according to the preamble of the independent Claims. Such a method and a corresponding device is closer from the below DE 197 42 588 known.
  • the prior art is also a feed line for electrical conductive coating material for potential separation with a to clean reciprocating pig body (DE 199 61 271).
  • the object of the invention is a method and a supply system indicate, on the one hand, an exact and as needed during the coating process variable dosage of from the coating member, for example, sprayed material allows and on the other hand in a color change lower Rinsing effort in terms of flushing media and time required as before.
  • the invention has the advantage that for dosing the metering pump required for the coating material does not have to be rinsed with a color change, since it does not is traversed by the coating material. Also for them Ink supply line between the pig stations is not a separate Flushing required as it comes from the insulating medium and / or the pig bodies is cleaned.
  • the paint channel 10 of the atomizer Z is over two parallel to each other the same color supply circuits A or B to each serving as a color supply device color changer FWA or FWB in the usual way connected. Between the paint channel 10 and the supply circuits A, B is each one controlled valve 12A and 12B connected.
  • Another controlled valve 12C is connected to the paint channel 10 of the atomizer Z further for purging the atomizer serving detergent system C connected.
  • Each of the two ink supply circuits A and B exists mainly from one in the immediate vicinity of the atomizer Z arranged first pig station MS1A or MS1B, one in near the relevant color changer FWA or FWB second pig station MS2A or MS2B, one of the leading second pig station to the first pig station Ink supply line ZLA or ZLB and one of the first Scraper station returning to the second pig station Return line RLA or RLB.
  • the supply and return lines each of the two color supply circuits A and B thus form a closed circuit, through its entire course an insulating medium can be conveyed through.
  • Each of the mentioned four pig stations is a double pig station designed to accommodate two pigs.
  • everyone Paint supply circuit A, B contains two pigs, which are labeled M1A and M2A and M1B and M2B, respectively, and between the Both pig stations can be moved back and forth.
  • each of the return lines RLA and RLB is each a metering pump PA or PB connected, the direction of rotation reversible is, so that they either in the opposite direction to the first pig station or in the opposite direction to the second pig station can.
  • the dosing pump PA and the two pig stations MS1A or MS2A of the ink supply circuit A contains the return line RLA depending on a controlled valve V4A or V1A.
  • controlled valves are V4B and V1B, respectively switched into the return line RLB.
  • the two color supply circuits A and B are one of them common Expansion tank 16 for as a sliding medium associated insulating medium associated with the return lines RLA and RLB connected via a respective line 14A and 14B is that, via a respective controlled valve V2A, V3A or V2B, V3B in the illustrated parallel arrangement on the two Pages of the metering pump PA or PB to the relevant Return line RLA or RLB is connected.
  • the expansion tank 16 has a movable volume change Piston which can be acted upon with compressed air on its rear side is.
  • the already mentioned detergent system C contains one of a Supply tank 18, which also has a volume change displaceable, acted upon by compressed air piston has, to the valve 12C leading line 20.
  • Parallel to the Line 20 is to the container 18 as a potential separation path serving piggable insulating line 22 connected, the at its the container 16 end facing a first Pig station 24 and at its one source 26 for detergent (e.g., thinner) a second pig station 25 contains.
  • the workpiece is e.g. a motor vehicle body, with out supplied to the paint supply circuit A through the valve 12A Paint material is coated.
  • Paint material is coated.
  • the first pig M1A in rest position in the first Pig station MS1A. That for painting and for a functional Reserve quantity (still) required paint volume is located in the line section 28 between the first pig station MS1A and the second pig M2A, which corresponds to that at the coating decreasing paint volume on the first pig station too moved.
  • the remainder of the supply line ZLA between the back of the M2A pig and the second pig station MS2A and the entire connected to the feed line Return line RLA are here filled with the insulating medium, that of the metering pump PA with the respective current Paint requirements corresponding, usually variable Production rate towards the second pig station MS2A and is pumped from there into the supply line ZLA and as a sliding medium via the pig M2A located in the line section 28 Paint material in the atomizer Z presses. in this connection the valves V1A and V3A are open while the valves V2A and V4A are closed.
  • the metering pump PA is so fed during the coating from the expansion tank 16, i.e. the applied amount of paint is by sliding medium replaced from the expansion tank 16.
  • the atomizer Z and the paint material in the line section 28 stand during the coating operation under high voltage, while the color changers FWA and FWB are constantly grounded.
  • the required especially for low-resistance paint material Potential separation takes place via the supply circuits A and B.
  • the required hose length of the lines between the two pig stations corresponds to the maximum required Paint volume (including reserve quantity) plus the double insulation required by the respective with insulating medium filled line sections first between the paint column introduced at the second pig station and the first pig station, then between the paint column and both pig stations and finally between the second pig station and the paint column are formed, wherein the latter insulating section during the coating getting bigger and bigger.
  • the metering the charge flow at the atomizer insulating and Sliding medium can be any flowable, preferably liquid medium can be used that electrically non-conductive, compatible with paint, as incompressible as possible and is suitable for the promotion by a metering pump.
  • the two newts of this circle are in the second Pig station MS2B.
  • the entire color supply circuit B is with the serving as a sliding medium insulating medium filled.
  • the extracted Isoliermediummenge is thus by the replenished paint replaces, while the pig M1B moved towards the first pig station MS1B.
  • the inflowing Paint amount is corresponding by the metering pump PB measured their flow rate, and if the desired Volume is filled, the color control valve of Color changer FWB, the valve 30 and the valve V2B closed, while the valve V1B is opened and the valve V4B remains open.
  • the pig M2B sits in Direction to the first pig station MS1B in motion.
  • the between the quantity of paint required for the two pigs becomes atomizer due to the flow rate of the insulating medium Z transported.
  • the pressing process is finished when the first pig M1B has reached the pig station MS1B.
  • the behind The paint column standing by this pig is above the atomizer Z placed on high voltage potential.
  • the for potential separation necessary insulating distance exists at this time between the pig M2B and the second pig station MS2B.
  • the preloaded supply circle B provided coating material has a different color as the previously removed from circle A coating material,
  • the high voltage turned off and rinsed the paint channel 10 of the atomizer, in typical Rotationszerstäubern on the main needle.
  • the rinse is via the line 20 of the detergent system C by displacing the piston of the supply container 16 fed to the atomizer Z.
  • the pig of the detergent system C is in the first during the coating operation Pig station 24 and is during the flushing process by the piston of the supply container 16 in the second pig station 25th pressed. Subsequently, the container 16 can be refilled and then the pig with compressed air in his first pig station 24 be pushed back, so that again the required Insulating distance between the pig stations 24 and 25 consists.
  • An essential advantage of the invention is that when changing colors only the areas of the color changer FWA or FWB, the pig stations MS1A, MS2A or MS1B, MS2B and the Atomizers Z need to be rinsed.
  • the paint material is pressed over the main needle of the atomizer and in the manner already described for circle A. be sprayed. So while the pig M1B in the Pig station MS1B is located, the pig M2B through the insulating medium promoted towards the atomizer Z. The dosage carried out by the pig acted paint material again about the dosage of the insulating medium through the metering pump PB, wherein the valves V1B and V3B open and the Valves V2B and V4B are closed and the applied Paint again through the sliding medium from the expansion tank 16 is replaced.
  • the mentioned return of the two pigs of the circle A in its second pig station MS2A is during the coating operation of the circle B completed.
  • the back promoted Lackreservemenge can in the second pig station MS2A over a valve 32 (shown in MS2B) and a return line disposed of or in a conventional manner in the usual loop of the system.
  • a valve 32 shown in MS2B
  • a return line disposed of or in a conventional manner in the usual loop of the system.
  • each of the two ink supply circuits A and B are each two initiators IN1A and IN2A or IN1B and IN2B provided as shown in one of the respective Minimum isolation distance corresponding to the distance two pig stations are arranged and, for example on appealing the appearance of the newts at the sites concerned Generate monitoring signals. If you like more Initiators variably positionable in front of the entrance of the first Pigging station MS1A or MS1B orders is thus one Self-optimization of the paint reserve quantity possible, i. these Quantity may be due to the coating practice absolutely necessary minimum be reduced.
  • the insulating medium is an electric non-conductive, imcompressible and paint-compatible Be pushing media.
  • the insulating medium used over time can, in particular by mixing with the paint material, can be a continuous or periodic monitoring of the Insulating medium in terms of its conductivity appropriate be. This can be done by direct conductivity measurement or indirectly, for example, by measuring the turbidity of the insulating medium.
  • the insulating medium can be removed from the system and against fresh material to be replaced. This change can be sensibly connected to a flushing process.
  • Pig carcasses are used when these are the inner walls of the strip off any hose or pipeline without residue.
  • the pig would be useful in circles A and B and / or in Flushing system C to use pigs in a tandem arrangement in which the pig between the front and rear sealing edges an open space to the line inner walls to accommodate a simultaneous with the loading promotion the Contains line cleaning detergent.
  • the moles M2A and M2B transported detergent can, for example filled in the second pig station MS2A or MS2B and later in one of the two pig stations of the be rinsed out again circle concerned.
  • FIG. 2 A convenient embodiment of such a pig (e.g. of the pig M2B in FIG. 1) in tandem design is shown in FIG. 2 shown.
  • the tandem pole essentially exists of two preferably the same, generally cylindrical Pig parts 2 and 2 ', by a relatively thin flexible Link 4 in a defined by the gleichsglid Distance A are connected to each other.
  • two pigs of a kind known per se which belong to the Forming a gap with a defined filling volume mechanically connected to each other.
  • Stainless steel wire or a rod made of elastomeric material existing Link 4 is at the facing each other End faces of the mole parts 2, 2 'attached or with them made in one piece.
  • Each pig part 2 or 2 ' has a cylindrical Middle part 6 and at the ends of each a peripheral edge part 7 and 8, the one over the entire circumference of the Inner wall of the line L adjacent sealing edge or Dichtoder Wiper lip has, as it is known with newts is.
  • Inside the middle part 6 of each of the two mole parts 2, 2 ' may be a permanent magnet M or M' are located on the the above-mentioned initiators for pig detection and production of signals, e.g. during the passage of the pig, can appeal.
  • the of the two pig parts 2, 2 ' formed gap 9 has that between the facing each other End faces of the axially inner peripheral edge parts 8 and 8 ', the circumference of the connecting member 4 and the inner wall of Line L defined filling volume for that of the pig the line L to be pushed rinsing or cleaning medium.
  • D is the sealing edge on the pipe or lip of the parts 7, 8 and an outside diameter d of the Link 4 should d be much smaller than D, especially less than half as large, while the distance A preferably not greater than 10 times the diameter D.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Elimination Of Static Electricity (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

Feed method has a given quantity of coating material moved along a feed line (ZLA,ZLB), providing potential separation, for supplying it to the spray coating head (Z) together with a displacement fluid between two spaced salamanders (M1A,M2A; M1B,M2B). Dosing of the coating fluid at the spray coating head is provided via a dosing pump (PA,PB) in the feedback line (RLA,RLB) for displacement fluid. An Independent claim for a feed system for a spray coating device is also included.

Description

Die Erfindung betrifft ein Verfahren zur Versorgung eines Beschichtungsorgans und ein Versorgungssystem für die insbesondere elektrostatische Serienbeschichtung von Werkstücken wie beispielsweise Fahrzeugkarossen gemäß dem Oberbegriff der unabhängigen Patentansprüche. Ein derartiges Verfahren und eine entsprechende Vorrichtung ist aus der im folgenden näher gewürdigten DE 197 42 588 bekannt.The invention relates to a method for supplying a coating member and a supply system for the particular electrostatic serial coating of workpieces such as For example, vehicle bodies according to the preamble of the independent Claims. Such a method and a corresponding device is closer from the below DE 197 42 588 known.

Bei einer aus der DE 198 30 029 A1 bekannten Beschichtungsanlage mit einem Versorgungssystem dieser Art zum Beschichten von Fahrzeugkarossen mit häufig wechselndem Farbmaterial werden die Farbmaterialien in der Reihenfolge der gewünschten Farben in eine Zuführleitung eingeführt und darin durch jeweils zwei Molchkörper voneinander getrennt, zwischen denen sich ein Isoliermedium zur Potentialtrennung befinden kann. Das Isoliermedium kann beispielsweise aus Reinigungsflüssigkeit bestehen.In a known from DE 198 30 029 A1 coating system with a supply system of this type for coating of car bodies with frequently changing color material the color materials in the order of the desired Colors introduced into a supply line and therein by each two pig bodies separated from each other, between those there may be an insulating medium for electrical isolation. The insulating medium, for example, from cleaning fluid consist.

Ferner ist es aus der oben genannten DE 197 42 588 A1 bekannt, das Beschichtungsmaterial für die serienweise Beschichtung von Werkstücken von einem Molch zu dem Applikationsorgan zu drücken, wobei der Molch seinerseits von einem unter Druck stehenden Spül- oder sonstigen Druckmedium beaufschlagt wird. Das Farbmaterial fließt hierbei durch die zum Dosieren erforderliche Pumpe. Furthermore, it is known from the above-mentioned DE 197 42 588 A1, the coating material for serial coating of workpieces to press from a pig to the application organ, wherein the newt in turn is under pressure Rinsing or other pressure medium is applied. The color material flows through the required for dosing Pump.

Stand der Technik ist auch, eine Zuführleitung für elektrisch leitendes Beschichtungsmaterial zur Potentialtrennung mit einem hin- und herbewegbaren Molchkörper zu reinigen (DE 199 61 271).The prior art is also a feed line for electrical conductive coating material for potential separation with a to clean reciprocating pig body (DE 199 61 271).

Aufgabe der Erfindung ist, ein Verfahren und ein Versorgungssystem anzugeben, die einerseits eine genaue und je nach Bedarf während des Beschichtungsvorgangs variable Dosierung des von dem Beschichtungsorgan beispielsweise versprühten Materials ermöglicht und andererseits bei einem Farbwechsel geringeren Spülaufwand hinsichtlich Spülmedien und Zeit erfordert als bisher.The object of the invention is a method and a supply system indicate, on the one hand, an exact and as needed during the coating process variable dosage of from the coating member, for example, sprayed material allows and on the other hand in a color change lower Rinsing effort in terms of flushing media and time required as before.

Diese Aufgabe wird durch die Merkmale der unabhängigen Patentansprüche 1 oder 10 gelöst.This object is solved by the features of independent claims 1 or 10.

Insbesondere hat die Erfindung den Vorteil, dass die zum Dosieren des Beschichtungsmaterials erforderliche Dosierpumpe bei einem Farbwechsel nicht gespült werden muss, da sie nicht von dem Beschichtungsmaterial durchflossen wird. Auch für die Farbzuführleitung zwischen den Molchstationen ist kein eigener Spülvorgang erforderlich, da sie von dem Isoliermedium und/oder den Molchkörpern gereinigt wird.In particular, the invention has the advantage that for dosing the metering pump required for the coating material does not have to be rinsed with a color change, since it does not is traversed by the coating material. Also for them Ink supply line between the pig stations is not a separate Flushing required as it comes from the insulating medium and / or the pig bodies is cleaned.

An dem in der Zeichnung dargestelltem Ausführungsbeispiel wird die Erfindung näher erläutert.At the exemplary embodiment shown in the drawing the invention will be explained in more detail.

Es zeigen:

Fig. 1
ein Farbversorgungssystem für einen elektrostatischen Rotationszerstäuber mit Potentialtrennung; und
Fig. 2
eine zweckmäßige Ausführungsform eines für das System nach Fig. 1 verwendeten Molches.
Show it:
Fig. 1
a paint supply system for an electrostatic rotary atomizer with potential separation; and
Fig. 2
a suitable embodiment of a pig used for the system of FIG. 1.

Gemäß Fig. 1 ist der Farbkanal 10 des Zerstäubers Z über zwei parallele untereinander gleiche Farbversorgungskreise A bzw. B an je einen als Farbversorgungseinrichtung dienenden Farbwechsler FWA bzw. FWB an sich üblicher Art angeschlossen. Zwischen dem Farbkanal 10 und den Versorgungskreisen A, B ist je ein gesteuertes Ventil 12A bzw. 12B geschaltet.According to FIG. 1, the paint channel 10 of the atomizer Z is over two parallel to each other the same color supply circuits A or B to each serving as a color supply device color changer FWA or FWB in the usual way connected. Between the paint channel 10 and the supply circuits A, B is each one controlled valve 12A and 12B connected.

Über ein weiteres gesteuertes Ventil 12C ist an den Farbkanal 10 des Zerstäubers Z ferner ein zum Spülen des Zerstäubers dienendes Spülmittelsystem C angeschlossen.Another controlled valve 12C is connected to the paint channel 10 of the atomizer Z further for purging the atomizer serving detergent system C connected.

Jeder der beiden Farbversorgungskreise A bzw. B besteht hauptsächlich aus einer in unmittelbarer Nähe des Zerstäubers Z angeordneten ersten Molchstation MS1A bzw. MS1B, einer in der Nähe des betreffenden Farbwechslers FWA bzw. FWB befindlichen zweiten Molchstation MS2A bzw. MS2B, einer von der zweiten Molchstation zu der ersten Molchstation führenden Farbzuführleitung ZLA bzw. ZLB und einer von der ersten Molchstation zu der zweiten Molchstation zurückführenden Rückführleitung RLA bzw. RLB. Die Zu- und Rückführleitungen jedes der beiden Farbversorgungskreise A bzw. B bilden also einen geschlossenen Leitungskreis, durch dessen gesamten Verlauf ein Isoliermedium hindurchgefördert werden kann.Each of the two ink supply circuits A and B exists mainly from one in the immediate vicinity of the atomizer Z arranged first pig station MS1A or MS1B, one in near the relevant color changer FWA or FWB second pig station MS2A or MS2B, one of the leading second pig station to the first pig station Ink supply line ZLA or ZLB and one of the first Scraper station returning to the second pig station Return line RLA or RLB. The supply and return lines each of the two color supply circuits A and B thus form a closed circuit, through its entire course an insulating medium can be conveyed through.

Jede der erwähnten vier Molchstationen ist als Doppelmolchstation zur Aufnahme von je zwei Molchen ausgebildet. Jeder Farbversorgungskreis A, B enthält zwei Molche, die mit M1A und M2A bzw. M1B und M2B bezeichnet sind und zwischen den beiden Molchstationen hin- und herbewegt werden können. Each of the mentioned four pig stations is a double pig station designed to accommodate two pigs. Everyone Paint supply circuit A, B contains two pigs, which are labeled M1A and M2A and M1B and M2B, respectively, and between the Both pig stations can be moved back and forth.

In jede der Rückführleitungen RLA und RLB ist je eine Dosierpumpe PA bzw. PB geschaltet, deren Drehrichtung umsteuerbar ist, so dass sie wahlweise in Gegenrichtung zur ersten Molchstation oder in Gegenrichtung zur zweiten Molchstation fördern kann. Zwischen der Dosierpumpe PA und den beiden Molchstationen MS1A bzw. MS2A des Farbversorgungskreises A enthält die Rückführleitung RLA je ein gesteuertes Ventil V4A bzw. V1A. In derselben Weise sind gesteuerte Ventile V4B bzw. V1B in die Rückführleitung RLB geschaltet.In each of the return lines RLA and RLB is each a metering pump PA or PB connected, the direction of rotation reversible is, so that they either in the opposite direction to the first pig station or in the opposite direction to the second pig station can. Between the dosing pump PA and the two pig stations MS1A or MS2A of the ink supply circuit A contains the return line RLA depending on a controlled valve V4A or V1A. In the same way, controlled valves are V4B and V1B, respectively switched into the return line RLB.

Den beiden Farbversorgungskreisen A und B ist ein ihnen gemeinsamer Ausgleichsbehälter 16 für das als Schiebemedium dienende Isoliermedium zugeordnet, der mit den Rückführleitungen RLA und RLB über je eine Leitung 14A bzw. 14B verbunden ist, die über je ein gesteuertes Ventil V2A, V3A bzw. V2B, V3B in der dargestellten Parallelanordnung auf den beiden Seiten der Dosierpumpe PA bzw. PB an die betreffende Rückführleitung RLA bzw. RLB angeschlossen ist. Der Ausgleichsbehälter 16 hat einen zur Volumenänderung verschiebbaren Kolben, der auf seiner Rückseite mit Druckluft beaufschlagbar ist.The two color supply circuits A and B are one of them common Expansion tank 16 for as a sliding medium associated insulating medium associated with the return lines RLA and RLB connected via a respective line 14A and 14B is that, via a respective controlled valve V2A, V3A or V2B, V3B in the illustrated parallel arrangement on the two Pages of the metering pump PA or PB to the relevant Return line RLA or RLB is connected. The expansion tank 16 has a movable volume change Piston which can be acted upon with compressed air on its rear side is.

Das schon erwähnte Spülmittelsystem C enthält eine von einem Versorgungsbehälter 18, der ebenfalls einen zur Volumenänderung verschiebbaren, mit Druckluft beaufschlagbaren Kolben hat, zu dem Ventil 12C führende Leitung 20. Parallel zu der Leitung 20 ist an den Behälter 18 eine als Potentialtrennstrecke dienende molchbare Isolierleitung 22 angeschlossen, die an ihrem dem Behälter 16 zugewandten Ende eine erste Molchstation 24 und an ihrem einer Quelle 26 für Spülmittel (z.B. Verdünner) zugewandten Ende eine zweite Molchstation 25 enthält. The already mentioned detergent system C contains one of a Supply tank 18, which also has a volume change displaceable, acted upon by compressed air piston has, to the valve 12C leading line 20. Parallel to the Line 20 is to the container 18 as a potential separation path serving piggable insulating line 22 connected, the at its the container 16 end facing a first Pig station 24 and at its one source 26 for detergent (e.g., thinner) a second pig station 25 contains.

Zur Erläuterung der Betriebsweise sei zunächst angenommen, dass das Werkstück z.B. eine Kraftfahrzeugkarosse, mit aus dem Farbversorgungskreis A durch das Ventil 12A zugeführtem Lackmaterial beschichtet wird. Bei diesem Zustand des Systems befindet sich der erste Molch M1A in Ruheposition in der ersten Molchstation MS1A. Das zum Lackieren und für eine zweckmäßige Reservemenge (noch) benötigte Lackvolumen befindet sich im Leitungsabschnitt 28 zwischen der ersten Molchstation MS1A und dem zweiten Molch M2A, der sich entsprechend dem bei der Beschichtung abnehmenden Lackvolumen auf die erste Molchstation zu bewegt. Der restliche Teil der Zuführleitung ZLA zwischen der Rückseite des Molches M2A und der zweiten Molchstation MS2A und die gesamte mit der Zuführleitung verbundene Rückführleitung RLA sind hierbei mit dem Isoliermedium gefüllt, das von der Dosierpumpe PA mit der dem jeweiligen momentanen Lackbedarf entsprechenden, gewöhnlich veränderlichen Förderrate in Richtung zu der zweiten Molchstation MS2A und von dort in die Zuführleitung ZLA gepumpt wird und als Schiebemedium über den Molch M2A das im Leitungsabschnitt 28 befindliche Lackmaterial in den Zerstäuber Z drückt. Hierbei sind die Ventile V1A und V3A geöffnet, während die Ventile V2A und V4A geschlossen sind. Die Dosierpumpe PA wird also während der Beschichtung aus dem Ausgleichsbehälter 16 gespeist, d.h. die applizierte Lackmenge wird durch Schiebemedium aus dem Ausgleichsbehälter 16 ersetzt.In order to explain the mode of operation, let us first assume that the workpiece is e.g. a motor vehicle body, with out supplied to the paint supply circuit A through the valve 12A Paint material is coated. In this state of the system is the first pig M1A in rest position in the first Pig station MS1A. That for painting and for a functional Reserve quantity (still) required paint volume is located in the line section 28 between the first pig station MS1A and the second pig M2A, which corresponds to that at the coating decreasing paint volume on the first pig station too moved. The remainder of the supply line ZLA between the back of the M2A pig and the second pig station MS2A and the entire connected to the feed line Return line RLA are here filled with the insulating medium, that of the metering pump PA with the respective current Paint requirements corresponding, usually variable Production rate towards the second pig station MS2A and is pumped from there into the supply line ZLA and as a sliding medium via the pig M2A located in the line section 28 Paint material in the atomizer Z presses. in this connection the valves V1A and V3A are open while the valves V2A and V4A are closed. The metering pump PA is so fed during the coating from the expansion tank 16, i.e. the applied amount of paint is by sliding medium replaced from the expansion tank 16.

Der Zerstäuber Z und das Lackmaterial im Leitungsabschnitt 28 stehen während des Beschichtungsbetriebes unter Hochspannung, während die Farbwechsler FWA und FWB ständig geerdet sind. Die vor allem bei niederohmigem Lackmaterial erforderliche Potentialtrennung erfolgt über die Versorgungskreise A und B. Die hierfür erforderliche Schlauchlänge der Leitungen zwischen den beiden Molchstationen entspricht dem maximal benötigten Lackvolumen (einschließlich Reservemenge) plus der doppelten erforderlichen Isolierstrecke, die durch die jeweils mit Isoliermedium gefüllten Leitungsabschnitte zunächst zwischen der an der zweiten Molchstation eingeführten Lacksäule und der ersten Molchstation, dann zwischen der Lacksäule und beiden Molchstationen und schließlich zwischen der zweiten Molchstation und der Lacksäule gebildet sind, wobei der letztgenannte Isolierabschnitt während der Beschichtung immer größer wird.The atomizer Z and the paint material in the line section 28 stand during the coating operation under high voltage, while the color changers FWA and FWB are constantly grounded. The required especially for low-resistance paint material Potential separation takes place via the supply circuits A and B. The required hose length of the lines between the two pig stations corresponds to the maximum required Paint volume (including reserve quantity) plus the double insulation required by the respective with insulating medium filled line sections first between the paint column introduced at the second pig station and the first pig station, then between the paint column and both pig stations and finally between the second pig station and the paint column are formed, wherein the latter insulating section during the coating getting bigger and bigger.

Als das den Ladefluß am Zerstäuber dosierende Isolier- und Schiebemedium kann ein an sich beliebiges fließfähiges, vorzugsweise flüssiges Medium verwendet werden, das elektrisch nichtleitend, lackverträglich, möglichst inkompressibel und für die Förderung durch eine Dosierpumpe geeignet ist.As the metering the charge flow at the atomizer insulating and Sliding medium can be any flowable, preferably liquid medium can be used that electrically non-conductive, compatible with paint, as incompressible as possible and is suitable for the promotion by a metering pump.

Während der Zerstäuber Z aus dem Kreis A versorgt wird, ist der parallele Versorgungskreis B bereit zum Andrücken des Lackmaterials für einen nachfolgenden Beschichtungsvorgang, der sich sofort und ohne Zeitverlust anschließen kann, wenn nicht wegen eines Farbwechsels ein zwischenzeitliches Spülen des Zerstäubers erforderlich ist.While the atomizer Z is supplied from the circle A, is the parallel supply circuit B ready for pressing the Paint material for a subsequent coating process, which can connect immediately and without loss of time, if not because of a color change a meantime rinse the atomizer is required.

Beim Ausgangszustand des Systems zum Vorladen des Kreises B befinden sich die beiden Molche dieses Kreises in der zweiten Molchstation MS2B. Der gesamte Farbversorgungskreis B ist mit dem als Schiebemedium dienenden Isoliermedium befüllt. Durch Öffnen eines der Farbsteuerventile F1, F2, Fx des Farbwechslers FWB strömt der gewünschte Farblack durch ein ebenfalls geöffnetes Ventil 30 der Molchstation MS2B zwischen die beiden Molche M2B und M1B, während durch Start der Dosierpumpe PB und Öffnen der Ventile V2B und V4B bei geschlossenem Ventil V1B Isoliermedium in entsprechender Volumenmenge vor dem Molch M1B entnommen und in den Ausgleichsbehälter 16 gepumpt wird. Die entnommene Isoliermediummenge wird also durch den nachströmenden Farblack ersetzt, während sich der Molch M1B in Richtung zur ersten Molchstation MS1B bewegt. Die einströmende Farblackmenge wird durch die Dosierpumpe PB entsprechend ihrer Fördermenge gemessen, und wenn die gewünschte Volumenmenge eingefüllt ist, werden das Farbsteuerventil des Farbwechslers FWB, das Ventil 30 und das Ventil V2B geschlossen, während das Ventil V1B geöffnet wird und das Ventil V4B geöffnet bleibt. Dadurch setzt sich auch der Molch M2B in Richtung zur ersten Molchstation MS1B in Bewegung. Die zwischen den beiden Molchen eingespannte benötigte Lackmenge wird aufgrund der Fördermenge des Isoliermediums zum Zerstäuber Z transportiert. Der Andrückvorgang ist beendet, wenn der erste Molche M1B die Molchstation MS1B erreicht hat. Die hinter diesem Molch bereitstehende Lacksäule ist über den Zerstäuber Z auf Hochspannungspotential gelegt. Die zur Potentialtrennung notwendige Isolierstrecke besteht zu diesem Zeitpunkt zwischen dem Molch M2B und der zweiten Molchstation MS2B.At the initial state of the system for precharging the circuit B the two newts of this circle are in the second Pig station MS2B. The entire color supply circuit B is with the serving as a sliding medium insulating medium filled. By Opening one of the color control valves F1, F2, Fx of the color changer FWB flows through the desired color coat by a likewise MS2B piggyback opened valve 30 between the two Moles M2B and M1B while starting the dosing pump PB and opening valves V2B and V4B with the valve closed V1B insulating medium in appropriate volume before Pig M1B removed and pumped into the expansion tank 16 becomes. The extracted Isoliermediummenge is thus by the replenished paint replaces, while the pig M1B moved towards the first pig station MS1B. The inflowing Paint amount is corresponding by the metering pump PB measured their flow rate, and if the desired Volume is filled, the color control valve of Color changer FWB, the valve 30 and the valve V2B closed, while the valve V1B is opened and the valve V4B remains open. As a result, the pig M2B sits in Direction to the first pig station MS1B in motion. The between the quantity of paint required for the two pigs becomes atomizer due to the flow rate of the insulating medium Z transported. The pressing process is finished when the first pig M1B has reached the pig station MS1B. The behind The paint column standing by this pig is above the atomizer Z placed on high voltage potential. The for potential separation necessary insulating distance exists at this time between the pig M2B and the second pig station MS2B.

Wenn zwischen zwei Beschichtungsvorgängen ein Farbwechsel erfolgt, hier also das in dem vorgeladenen Versorgungskreis B bereitgestellte Beschichtungsmaterial eine andere Farbe hat als das zuvor dem Kreis A entnommene Beschichtungsmaterial, wird beispielsweise in der Beschichtungspause zwischen dem Entfernen eines bereits lackierten Werkstücks und dem Zuführen des nächsten Werkstücks (Karossenlücke) die Hochspannung abgeschaltet und der Farbkanal 10 des Zerstäubers gespült, bei typischen Rotationszerstäubern über dessen Hauptnadel. Das Spülmittel wird über die Leitung 20 des Spülmittelsystems C durch Verschieben des Kolbens des Versorgungsbehälters 16 dem Zerstäuber Z zugeführt. Der Molch des Spülmittelsystems C befindet sich während des Beschichtungsbetriebes in der ersten Molchstation 24 und wird beim Spülvorgang durch den Kolben des Versorgungsbehälters 16 in die zweite Molchstation 25 gedrückt. Anschließend kann der Behälter 16 nachgefüllt und dann der Molch mit Druckluft in seine erste Molchstation 24 zurückgeschoben werden, so dass dann wieder die erforderliche Isolierstrecke zwischen den Molchstationen 24 und 25 besteht.If a color change occurs between two coating operations, here in the preloaded supply circle B provided coating material has a different color as the previously removed from circle A coating material, For example, in the coating break between the Removing a previously painted workpiece and feeding of the next workpiece (body gap) the high voltage turned off and rinsed the paint channel 10 of the atomizer, in typical Rotationszerstäubern on the main needle. The rinse is via the line 20 of the detergent system C by displacing the piston of the supply container 16 fed to the atomizer Z. The pig of the detergent system C is in the first during the coating operation Pig station 24 and is during the flushing process by the piston of the supply container 16 in the second pig station 25th pressed. Subsequently, the container 16 can be refilled and then the pig with compressed air in his first pig station 24 be pushed back, so that again the required Insulating distance between the pig stations 24 and 25 consists.

Ein wesentlicher Vorteil der Erfindung besteht darin, dass beim Farbwechsel nur die Bereiche des Farbwechslers FWA oder FWB, die Molchstationen MS1A, MS2A oder MS1B, MS2B und der Zerstäuber Z gespült werden müssen.An essential advantage of the invention is that when changing colors only the areas of the color changer FWA or FWB, the pig stations MS1A, MS2A or MS1B, MS2B and the Atomizers Z need to be rinsed.

Schon während des Spülens des Zerstäubers Z oder, wenn kein Spülvorgang erforderlich ist, während des Beschichtungsbetriebes mit Lackmaterialentnahme aus dem Kreis B beginnt im Kreis A die Rückführung der beiden Molche M1A und M2A mit der ggf. zwischen ihnen verbliebenen Lackreservemenge zu der zweiten Molchstation MS2A. Zu diesem Zweck wird die Drehrichtung der Dosierpumpe PA umgekehrt. Die Pumpe fördert nun bei geöffneten Ventilen V1A und 4A und geschlossenen Ventilen V2A und V3A in Richtung zur Molchstation MS1A und von dort in Richtung zur zweiten Molchstation MS2A, bis sich schließlich im Kreis A wieder der Ausgangszustand zum Vorladen des Kreises A in der oben für den Kreis B beschriebenen Weise ergibt.Even while flushing the atomizer Z or, if not Rinsing process is required during the coating operation with paint material removal from the circle B begins in Circle A the return of the two pigs M1A and M2A with the if necessary, remaining paint reserve quantity between them second pig station MS2A. For this purpose, the direction of rotation the metering pump PA reversed. The pump now helps with open valves V1A and 4A and closed valves V2A and V3A towards the pig station MS1A and from there in Direction to the second pig station MS2A, until finally in circle A again the initial state for pre-charging the circle A in the manner described above for the circle B results.

Nach dem Spülvorgang kann aus dem zuvor vorgeladenen Kreis B das Lackmaterial über die Hauptnadel des Zerstäubers angedrückt und in der schon für den Kreis A beschriebenen Weise versprüht werden. Während sich also der Molch M1B in der Molchstation MS1B befindet, wird der Molch M2B durch das Isoliermedium in Richtung zum Zerstäuber Z gefördert. Die Dosierung des von dem Molch beaufschlagten Lackmaterials erfolgt wieder über die Dosierung des Isoliermediums durch die Dosierpumpe PB, wobei die Ventile V1B und V3B geöffnet und die Ventile V2B und V4B geschlossen sind und die applizierte Lackmenge wieder durch das Schiebemedium aus dem Ausgleichsbehälter 16 ersetzt wird.After the rinsing process can from the previously preloaded circle B the paint material is pressed over the main needle of the atomizer and in the manner already described for circle A. be sprayed. So while the pig M1B in the Pig station MS1B is located, the pig M2B through the insulating medium promoted towards the atomizer Z. The dosage carried out by the pig acted paint material again about the dosage of the insulating medium through the metering pump PB, wherein the valves V1B and V3B open and the Valves V2B and V4B are closed and the applied Paint again through the sliding medium from the expansion tank 16 is replaced.

Die erwähnte Rückförderung der beiden Molche des Kreises A in dessen zweite Molchstation MS2A wird während des Beschichtungsbetriebes des Kreises B vollendet. Die zurückgeförderte Lackreservemenge kann in der zweiten Molchstation MS2A über ein Ventil 32 (in MS2B dargestellt) und eine Rückführleitung entsorgt oder in an sich bekannte Weise in die übliche Ringleitung des Systems zurückgemolcht werden. Anschließend wird der Farbwechsler FWA gespült, wenn eine neue Farbe angewählt wurde. Wird die gleiche Farbe wieder benötigt, kann der Prozessablauf sofort erneut mit dem Vorladen des Kreises A beginnen.The mentioned return of the two pigs of the circle A in its second pig station MS2A is during the coating operation of the circle B completed. The back promoted Lackreservemenge can in the second pig station MS2A over a valve 32 (shown in MS2B) and a return line disposed of or in a conventional manner in the usual loop of the system. Subsequently, will the color changer FWA flushed when a new color is selected has been. If the same color is needed again, the process flow Immediately start recharging the circle A again.

Ist das Spülen des Farbwechslers notwendig, kann dies auch bereits erfolgen, sobald sich die benötigte Farbmenge in der zugehörigen Zuführleitung befindet.If the rinse of the color changer is necessary, this can also be done already done as soon as the required amount of color in the associated feed line is located.

Zur Absicherung der für die Potentialtrennung erforderlichen Isolierstrecken sind für jeden der beiden Farbversorgungskreise A und B je zwei Initiatoren IN1A und IN2A bzw. IN1B und IN2B vorgesehen, die wie dargestellt in einer der jeweiligen Mindestisolierstrecke entsprechenden Entfernung von den beiden Molchstationen angeordnet sind und beispielsweise auf das Erscheinen der Molche an den betreffenden Stellen ansprechend Überwachungssignale erzeugen. Wenn man weitere ähnliche Initiatoren variabel positionierbar vor dem Eingang der ersten Molchstation MS1A bzw. MS1B anordnet, ist damit eine Selbstoptimierung der Lackreservemenge möglich, d.h. diese Menge kann auf das sich in der Beschichtungspraxis ergebende unbedingt erforderliche Minimum reduziert werden.To secure the necessary for the isolation Insulating distances are for each of the two ink supply circuits A and B are each two initiators IN1A and IN2A or IN1B and IN2B provided as shown in one of the respective Minimum isolation distance corresponding to the distance two pig stations are arranged and, for example on appealing the appearance of the newts at the sites concerned Generate monitoring signals. If you like more Initiators variably positionable in front of the entrance of the first Pigging station MS1A or MS1B orders is thus one Self-optimization of the paint reserve quantity possible, i. these Quantity may be due to the coating practice absolutely necessary minimum be reduced.

Wie schon erwähnt wurde, soll das Isoliermedium ein elektrisch nichtleitendes, imkompressibles und lackverträgliches Schiebemedium sein. In Fällen, in denen sich die Leitfähigkeit des verwendeten Isoliermediums im Laufe der Zeit ändern kann, insbesondere durch Vermischung mit dem Lackmaterial, kann eine kontinuierliche oder periodische Überwachung des Isoliermediums hinsichtlich seiner Leitfähigkeit zweckmäßig sein. Dies kann durch unmittelbare Leitfähigkeitsmessung geschehen oder auch mittelbar bspw. durch Messung der Trübung des Isoliermediums. Wenn ein kritischer Wert erreicht wird, kann das Isoliermedium dem System entnommen werden und gegen frisches Material ausgetauscht werden. Dieser Wechsel kann sinnvoll mit einem Spülvorgang verbunden werden.As already mentioned, the insulating medium is an electric non-conductive, imcompressible and paint-compatible Be pushing media. In cases where the conductivity is change the insulating medium used over time can, in particular by mixing with the paint material, can be a continuous or periodic monitoring of the Insulating medium in terms of its conductivity appropriate be. This can be done by direct conductivity measurement or indirectly, for example, by measuring the turbidity of the insulating medium. When a critical value is reached, the insulating medium can be removed from the system and against fresh material to be replaced. This change can be sensibly connected to a flushing process.

In dem hier beschriebenen System können an sich bekannte Molchkörper verwendet werden, wenn diese die Innenwände der jeweiligen Schlauch- oder Rohrleitung rückstandsfrei abstreifen. Zur Erzielung eines zusätzlichen Reinigungseffektes kann es aber zweckmäßig sein, in den Kreisen A und B und/oder im Spülsystem C Molche in einer Tandemanordnung zu verwenden, bei welcher der Molch zwischen vorderen und hinteren Dichtkanten einen zu den Leitungsinnenwänden offenen Zwischenraum zur Aufnahme eines gleichzeitig mit der Ladeförderung die Leitung reinigenden Spülmittels enthält. Das zur Schlauchreinigung in den Kreisen A und B zwischen den Dichtkanten z. B. der Molche M2A und M2B transportierte Spülmittel kann beispielsweise in der zweiten Molchstation MS2A bzw. MS2B eingefüllt und später in einer der beiden Molchstationen des betreffenden Kreises wieder ausgespült werden. In the system described here can be known per se Pig carcasses are used when these are the inner walls of the strip off any hose or pipeline without residue. To achieve an additional cleaning effect can but it would be useful in circles A and B and / or in Flushing system C to use pigs in a tandem arrangement in which the pig between the front and rear sealing edges an open space to the line inner walls to accommodate a simultaneous with the loading promotion the Contains line cleaning detergent. The hose cleaning in the circles A and B between the sealing edges z. B. The moles M2A and M2B transported detergent can, for example filled in the second pig station MS2A or MS2B and later in one of the two pig stations of the be rinsed out again circle concerned.

Eine zweckmäßige Ausführungsform eines solchen Molches (z.B. des Molches M2B in Fig. 1) in Tandemausführung ist in Fig. 2 dargestellt. Demnach besteht der Tandemmolch im wesentlichen aus zwei vorzugsweise gleichen, allgemein zylindrischen Molchteilen 2 bzw. 2', die durch ein relativ dünnes biegsames Verbindungsglied 4 in einem durch das Verbindungsglid definierten Abstand A miteinander verbunden sind. Im Prinzip kann es sich um zwei Molch an sich bekannter Art handeln, die zur Bildung eines Zwischenraums mit definiertem Füllvolumen mechanisch miteinander verbunden sind. Das beispielsweise aus Edelstahldraht oder einem Stab aus elastomerem Werkstoff bestehende Verbindungsglied 4 ist an den einander zugewandten Stirnseiten der Molchteile 2, 2' befestigt oder mit ihnen einstückig gefertigt. Jedes Molchteil 2 bzw. 2' hat ein zylindrisches Mittelteil 6 und an dessen Enden je ein Umfangsrandteil 7 bzw. 8, das eine über den gesamten Umfang an der Innenwand der Leitung L anliegende Dichtkante oder Dichtoder Abstreiflippe hat, wie es bei Molchen an sich bekannt ist. Im Inneren des Mittelteils 6 jedes der beiden Molchteile 2, 2' kann sich ein Dauermagnet M bzw. M' befinden, auf den die oben erwähnten Initiatoren zur Molcherkennung und zur Erzeugung von Signalen, z.B. bei der Vorbeibewegung des Molches, ansprechen können. Der von den beiden Molchteilen 2, 2' gebildete Zwischenraum 9 hat das zwischen den einander zugewandten Stirnseiten der axial inneren Umfangsrandteile 8 bzw. 8', dem Umfang des Verbindungsgliedes 4 und der Innenwand der Leitung L definierte Füllvolumen für das von dem Molch durch die Leitung L zu schiebende Spül- oder Reinigungsmedium. Bei einem dem Innendurchmesser der Leitung L entsprechenden Außendurchmesser D der an der Leitung anliegenden Dichtkante oder Lippe der Teile 7, 8 und einem Außendurchmesser d des Verbindungsgliedes 4 soll d wesentlich kleiner sein als D, insbesondere weniger als halb so groß, während der Abstand A vorzugsweise nicht größer ist als das 10-fache des Durchmessers D.A convenient embodiment of such a pig (e.g. of the pig M2B in FIG. 1) in tandem design is shown in FIG. 2 shown. Thus, the tandem pole essentially exists of two preferably the same, generally cylindrical Pig parts 2 and 2 ', by a relatively thin flexible Link 4 in a defined by the Verbindungsglid Distance A are connected to each other. In principle, can it is a question of two pigs of a kind known per se which belong to the Forming a gap with a defined filling volume mechanically connected to each other. For example Stainless steel wire or a rod made of elastomeric material existing Link 4 is at the facing each other End faces of the mole parts 2, 2 'attached or with them made in one piece. Each pig part 2 or 2 'has a cylindrical Middle part 6 and at the ends of each a peripheral edge part 7 and 8, the one over the entire circumference of the Inner wall of the line L adjacent sealing edge or Dichtoder Wiper lip has, as it is known with newts is. Inside the middle part 6 of each of the two mole parts 2, 2 'may be a permanent magnet M or M' are located on the the above-mentioned initiators for pig detection and production of signals, e.g. during the passage of the pig, can appeal. The of the two pig parts 2, 2 ' formed gap 9 has that between the facing each other End faces of the axially inner peripheral edge parts 8 and 8 ', the circumference of the connecting member 4 and the inner wall of Line L defined filling volume for that of the pig the line L to be pushed rinsing or cleaning medium. at an outer diameter corresponding to the inner diameter of the conduit L. D is the sealing edge on the pipe or lip of the parts 7, 8 and an outside diameter d of the Link 4 should d be much smaller than D, especially less than half as large, while the distance A preferably not greater than 10 times the diameter D.

Vorteile ergeben sich auch dann, wenn man statt der an sich zweckmäßigen Molche des beschriebenen Systems sonstige Medientrenner verwendet und das Beschichtungsmaterial den Zuführleitungen über andersartige Ventilstationen zuführt bzw. entnimmt. Ferner kann die durch die Erfindung erreichbare Reduzierung des bei einem Farbwechsel erforderlichen Spülaufwandes auch bei Beschichtungsanlagen vorteilhaft sein, bei denen keine Potentialtrennung zwischen dem Zerstäuber und einem Farbwechsler oder dgl. notwendig ist.Benefits also arise when you instead of the in itself expedient pigs of the described system other media separator used and the coating material to the feed lines via different valve stations feeds or extracts. Furthermore, the achievable by the invention reduction of the required rinse effort in a color change also be advantageous in coating systems at which no potential separation between the atomizer and a color changer or the like. Is necessary.

Soweit es zur Potentialtrennung erforderlich ist, bestehen die beschriebenen Leitungskreise (zumindest deren durch molchbare Schläuche gebildete Leitungen) aus elektrisch nichtleitendem Werkstoff.As far as it is necessary for potential separation exist the circuits described (at least their by piggable tubes formed lines) from electrical non-conductive material.

Claims (15)

  1. Method of supplying a coating element (Z) for the serial coating of workpieces, such as vehicle bodies, with coating material, which is supplied from a supply device (FWA, FWB) to the coating element (Z) through a supply line (ZLA, ZLB), which extends between a first pig station (MS1A, MS1B), situated in the vicinity of the coating element (Z), and a second pig station (MS2A, MS2B), situated in the vicinity of the supply device (FWA, FWB), wherein the coating material is conveyed in the amount predetermined for a coating process between pigs (M1A, M2A; M1B, M2B) together with a separate medium through the supply line (ZLA, ZLB), particularly for electrostatic coating with low-resistance coating material, which is supplied from an earthed supply device (FWA, FWB) to the coating element (Z), to which high voltage is applied during the coating, and is conveyed with an insulating medium through the supply line (ZLA, ZLB), characterised in that the coating material is conveyed to the coating element (Z) by a metering pump (PA, PB), through which only the separate medium, which acts as a thrust medium, flows.
  2. Method as claimed in Claim 1, characterised in that the thrust medium is conveyed by the metering pump (PA, PB) through the supply line (ZLA, ZLB) in the direction towards the first pig station (MS1A, MS1B) and from there is conveyed back through a return line (RLA, RLB) leading to the second pig station (MS2A, MS2B).
  3. Method as claimed in Claim 1 or 2, characterised in that when introducing the coating material between the two pigs (M1A, M2A; M1B, M2B) a corresponding volume of the thrust medium is conveyed into a fluid reservoir.
  4. Method as claimed in one of the preceding claims, characterised in that the supply and return lines of the supply circuit (A, B) are filled with an insulating medium, that the coating material is introduced at the second pig station (MS2A, MS2B) between the two pigs (M1A, M1B; M2A, M2B), that the coating material is conveyed through the supply line (ZLA, ZLB), trapped between the pigs until the front pig (M1A, Ml B) in the conveying direction reaches the first pig station (MS1A, MS1B), whereby at this time the length of the conductive path filled with insulating material between the rear pig (M2A, M2B) and the second pig station (MS2A, MS2B) is sufficient for electrical isolation between the coating element (Z) and the supply device (FWA, FWB), and that the coating material is then conveyed by the metering pump (PA, PB) by means of the insulating medium and the rear pig (M2A, M2B) to the coating element (Z) while the front pig (M1A, M1B) remains in the first pig station (MS1A, MS1B).
  5. Method as claimed in one of the preceding claims, characterised in that the two pigs (M1A, M2A; M1B, M2B) are returned through the supply line (ZLA, ZLB) into the second pig station (MS2A, MS2B) by the metering pump (PA, PB), which conveys the thrust medium with the direction of rotation reversed with respect to coating operation.
  6. Method as claimed in one of the preceding claims, characterised in that, during the coating of a workpiece with coating material from the supply line (ZLA) of a first supply circuit (A), a second supply circuit (B) with similar supply and return lines (ZLB, RLB) and pig stations (MS1B, MS2B) and a metering pump (BB) is prepared for a subsequent coating process, whereby the coating medium of the second supply circuit (B) is conveyed through its supply line (ZLB) until the front pig (M1B) has reached its first pig station (MS1B).
  7. Method as claimed in one of the preceding claims, characterised in that the metering pump (PA, PB) conveys the thrust medium with a flow rate which alters during the coating to correspond to the instantaneously required amount of coating material..
  8. Method as claimed in one of the preceding claims, characterised in that a pig (M1A, M2A, M1B, M2B) is used, which includes, between front and rear sealing edges (8, 8'), a space, open to the inner walls of the conduit, for receiving a cleansing agent cleaning the conduit, and that the cleansing agent is introduced into the space (9) in one of the pig stations (MS2A, MS2B, 24, 25) and, after use, is flushed out again in one of the pig stations.
  9. Method as claimed in one of the preceding claims, characterised in that the electrical conductivity of the insulating thrust medium is continuously or periodically measured or determined and the thrust medium is replaced with fresh material when a predetermined conductivity value is exceeded.
  10. Supply system for the, in particular, electrostatic serial coating of work pieces, such as vehicle bodies, with, in particular, low resistance coating material, which is supplied from a supply device (FWA, FWB) to a coating element (Z) through a supply line (ZLA, ZLB), which extends between a first pig station (MS1A, MS1B), situated in the vicinity of the coating element (Z), and a second pig station (MS2A, MS2B), situated in the vicinity of the supply device (FWA, FWB), characterised in that the end of the supply line (ZLA, ZLB) situated at the first pig station (MS1A, MS1B) is connected to the end of the supply line situated at the second pig station (MS2A, MS2B) by a return line (RLA, RLB), which includes a metering pump (PA, PB), through which only one separate medium, acting as a thrust medium for the coating material, flows.
  11. Supply system as claimed in Claim 10, characterised in that a conduit (14A, 14B), which leads to a fluid reservoir (16) for the thrust medium, branches off from the supply line (RLA, RLB).
  12. Supply system as claimed in Claim 11, characterised in that the conduit (14A, 14B), which leads to the fluid reservoir (16), is connected via a respective controllable valve (V2A, V3A, V2B, V3B) on both sides of the metering pump (PA, PB) to the return line (RLA, RLB) and that the return line includes controllable valves (V1A, V4A, V1B, V4B) between the metering pump and the two pig stations (MS1A, MS2A, MS1B, MS2B).
  13. Supply system as claimed in one of Claims 10 to 12, characterised in that two similar supply circuits (A, B), each with the two pig stations (MS 1A, MS2A; MS1B, MS2B), the supply and return line (ZLA, RLA; ZLB, RLB) and the metering pump (PA, PB) are connected in parallel to the coating element (Z).
  14. Supply system as claimed in Claim 13, characterised in that a common fluid reservoir (16) for the insulating medium is connected to both supply circuits (A, B).
  15. Supply system as claimed in one of Claims 10 to 14, characterised in that connected to the coating element (Z) for cleaning in the event of a paint change there is a separate cleansing agent system (C), which includes a piggable cleansing agent supply line between two pig stations (24, 25) constituting an insulating gap for voltage isolation during the coating process.
EP01114338A 2000-07-13 2001-06-13 Paint supply system with piggable supply lines for an electrostatic coating device Expired - Lifetime EP1172152B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10033987 2000-07-13
DE10033987A DE10033987A1 (en) 2000-07-13 2000-07-13 Process for supplying a coating member for the electrostatic series coating of workpieces and supply system therefor

Publications (2)

Publication Number Publication Date
EP1172152A1 EP1172152A1 (en) 2002-01-16
EP1172152B1 true EP1172152B1 (en) 2003-08-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP01114338A Expired - Lifetime EP1172152B1 (en) 2000-07-13 2001-06-13 Paint supply system with piggable supply lines for an electrostatic coating device

Country Status (4)

Country Link
EP (1) EP1172152B1 (en)
AT (1) ATE247527T1 (en)
DE (2) DE10033987A1 (en)
ES (1) ES2204785T3 (en)

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CN102307673A (en) * 2008-12-23 2012-01-04 Abb公司 Paint shuttle system
US10272458B2 (en) 2016-01-08 2019-04-30 J&R Design Systems, Inc. Liquid distribution system and method

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CN102307673A (en) * 2008-12-23 2012-01-04 Abb公司 Paint shuttle system
CN102307673B (en) * 2008-12-23 2016-01-20 Abb公司 Paint shuttle system
US10272458B2 (en) 2016-01-08 2019-04-30 J&R Design Systems, Inc. Liquid distribution system and method

Also Published As

Publication number Publication date
EP1172152A1 (en) 2002-01-16
DE50100509D1 (en) 2003-09-25
ES2204785T3 (en) 2004-05-01
DE10033987A1 (en) 2002-01-24
ATE247527T1 (en) 2003-09-15

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