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EP1172152A1 - 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
EP1172152A1
EP1172152A1 EP01114338A EP01114338A EP1172152A1 EP 1172152 A1 EP1172152 A1 EP 1172152A1 EP 01114338 A EP01114338 A EP 01114338A EP 01114338 A EP01114338 A EP 01114338A EP 1172152 A1 EP1172152 A1 EP 1172152A1
Authority
EP
European Patent Office
Prior art keywords
pig
coating
supply
medium
line
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.)
Granted
Application number
EP01114338A
Other languages
German (de)
French (fr)
Other versions
EP1172152B1 (en
Inventor
Michael Baumann
Thomas Hezel
Kurt Vetter
Frank Herre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
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Filing date
Publication date
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Publication of EP1172152A1 publication Critical patent/EP1172152A1/en
Application granted granted Critical
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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
    • 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 Series electrostatic coating of workpieces such as for example vehicle bodies according to the preamble of the independent Claims.
  • a coating system known from DE 198 30 029 A1 with a supply system of this type for coating of vehicle bodies with frequently changing color material the color materials in the order of the desired Colors introduced into a feed line and through each two pig bodies separated from each other, between them there may be an insulating medium for electrical isolation.
  • the insulating medium can for example consist of cleaning liquid consist.
  • the object of the invention is a method and a supply system specify the one that is accurate and as needed during the coating process variable dosage of the material sprayed from the coating member, for example enables and on the other hand less with a color change Rinsing effort in terms of rinsing media and time required as before.
  • the invention has the advantage that for dosing of the coating material required dosing pump does not need to be rinsed when changing colors as it does not is flowed through by the coating material. Also for them The paint supply line between the pig stations is not a separate one Flushing process required because of the insulating medium and / or the pig bodies are cleaned.
  • the color channel 10 of the atomizer Z is over two parallel ink supply circuits A or B to a color changer serving as a color supply device FWA or FWB connected in the usual way. Is between the color channel 10 and the supply circuits A, B. a controlled valve 12A or 12B each switched.
  • Another color controlled valve 12C is connected to the paint channel 10 of the atomizer Z also for rinsing the atomizer serving detergent system C.
  • 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 to the first pig station Ink supply line ZLA or ZLB and one of the first Pig station leading back to the second pig station Return line RLA or RLB.
  • the feed and return lines each of the two ink supply circuits A and B form a closed circuit, through its entire course an insulating medium can be conveyed through.
  • Each of the four pig stations mentioned is a double pig station designed to accommodate two pigs each.
  • Everyone Ink supply circuit A, B contains two pigs, with M1A and M2A or M1B and M2B are designated and between the two pig stations can be moved back and forth.
  • each of the return lines RLA and RLB PA or PB There is a metering pump in each of the return lines RLA and RLB PA or PB switched, the direction of rotation reversible is, so that it is optionally in the opposite direction to the first pig station or convey 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 each a controlled valve V4A or V1A. Valves V4B and V1B are controlled in the same way switched into the return line RLB.
  • the two ink supply circuits A and B have one thing in common Expansion tank 16 for the as a sliding medium serving insulating medium associated with the return lines RLA and RLB connected via a line 14A and 14B, respectively which is controlled by a controlled valve V2A, V3A or V2B, V3B in the parallel arrangement shown on the two Sides of the dosing pump PA or PB to the relevant one Return line RLA or RLB is connected.
  • the expansion tank 16 has a slidable for volume change Piston that can be pressurized with compressed air on its back is.
  • the detergent system C already mentioned contains one of one Supply container 18, which also has a volume change displaceable pistons to which compressed air can be applied has line 20 leading to the valve 12C. Parallel to the Line 20 is on the container 18 as a potential isolation serving pigable insulating line 22 connected, the first at its end facing the container 16 Pig station 24 and at a source 26 of detergent (e.g. thinner) end facing a second pig station 25 contains.
  • the atomizer Z and the paint material in the line section 28 are under high voltage during the coating operation, while the color changers FWA and FWB are constantly grounded.
  • the one that is particularly necessary with low-resistance paint material Potential isolation takes place via supply circuits A and B.
  • the required hose length of the lines between the two pig stations correspond to the maximum required Paint volume (including reserve quantity) plus the double the required insulation distance, each by line sections filled with insulating medium initially between the paint column introduced at the second pig station and the first pig station, then between the paint column and two newt stations and finally between the second pig station and the paint column are formed, wherein the latter insulating section during the coating is getting bigger.
  • the insulating and metering the charge flow at the atomizer Sliding medium can be any flowable, preferably liquid medium can be used that is electrical non-conductive, compatible with paint, as incompressible as possible and is suitable for delivery by a dosing pump.
  • the two newts of this circle are in the second Newt station MS2B.
  • the entire paint supply circuit B is included the insulating medium serving as a sliding medium.
  • Open one of the color control valves F1, F2, Fx of the color changer FWB also flows through the desired color varnish open valve 30 of the pig station MS2B between the two Newts M2B and M1B while starting the dosing pump PB and opening the valves V2B and V4B with the valve closed V1B insulating medium in a corresponding volume before the Pig M1B removed and pumped into the expansion tank 16 becomes.
  • the quantity of insulation medium removed is therefore determined by the flowing paint replaced while the newt M1B moved towards the first pig station MS1B.
  • the inflowing The amount of colored lacquer is adjusted accordingly by the dosing pump PB measured their delivery rate, and if the desired Volume is filled, the color control valve of the Color changer FWB, valve 30 and valve V2B closed, while valve V1B is opened and valve V4B remains open.
  • the newt M2B also sets in Direction to the first pig station MS1B in motion.
  • the between required amount of paint clamped in the two pigs becomes an atomizer due to the flow rate of the insulating medium Z transported.
  • the pressing process is finished when the the first pigs M1B have reached the pig station MS1B.
  • the behind this pig of paint ready is over the atomizer Z placed on high voltage potential.
  • the one for electrical isolation the necessary insulation gap exists at this time between the newt M2B and the second newt station MS2B.
  • the preloaded supply circuit B If there is a color change between two coating processes, so here in the preloaded supply circuit B provided coating material has a different color than the coating material previously taken from circle A, is for example in the coating break between the Removing an already painted workpiece and feeding it of the next workpiece (body gap) the high voltage switched off and the paint channel 10 of the atomizer rinsed, in typical rotary atomizers over its main needle.
  • the detergent is through line 20 of the detergent system C by moving the piston of the supply container 16 fed to the atomizer Z.
  • the pig of the detergent system C is in the first during coating operation Pig station 24 and is flushed by the piston of the supply container 16 into the second pig station 25 pressed.
  • the container 16 can then be refilled and then the pig with compressed air into its first pig station 24 be pushed back, so that again the required Isolation distance between the pig stations 24 and 25 exists.
  • a major advantage of the invention is that when changing colors only the areas of the color changer FWA or FWB, the newt stations MS1A, MS2A or MS1B, MS2B and the Atomizer Z need to be rinsed.
  • the lacquer material is pressed over the main needle of the atomizer and in the manner already described for circle A. be sprayed. So while the newt M1B is in the Pig station MS1B is located, the pig M2B through the insulating medium promoted towards atomizer Z. The dosage of the paint material acted upon by the pig again via the metering of the insulating medium by the metering pump PB, with the valves V1B and V3B opened and the Valves V2B and V4B are closed and the applied Paint quantity again through the sliding medium from the expansion tank 16 is replaced.
  • the aforementioned return transport of the two newts of the district A in its second pig station MS2A is during the coating operation of circle B completed.
  • the returned Paint reserve quantity can be in the second pig station MS2A a valve 32 (shown in MS2B) and a return line disposed of or in a conventional manner in the usual ring line the system will be pigged back. Then will the color changer FWA rinsed when a new color is selected has been. If the same color is needed again, the process flow can Immediately start preloading circuit A.
  • each of the two paint supply circuits A and B each have two initiators IN1A and IN2A and IN1B and IN2B provided as shown in one of the respective Minimum insulation distance corresponding distance from the two pig stations are arranged and for example on the appearance of the newts in the relevant areas appealing Generate monitoring signals. If you have more similar Initiators can be positioned variably in front of the entrance of the first Arranging the pig station MS1A or MS1B is one Self-optimization of the paint reserve quantity possible, i.e. this Quantity can depend on what results in the coating practice absolutely necessary minimum can be reduced.
  • the insulating medium is said to be electrical non-conductive, incompressible and compatible with paints Be a sliding medium.
  • the insulation medium used over time can, especially by mixing with the paint material, continuous or periodic monitoring of the Insulating medium useful with regard to its conductivity his. This can be done by direct conductivity measurement or indirectly, for example by measuring the turbidity of the insulating medium.
  • the insulation medium can be removed from the system and against fresh material can be exchanged. This change can be meaningfully connected to a rinsing process.
  • Pigging bodies are used when these cover the inner walls of the Strip off the respective hose or pipe without leaving any residue.
  • the pigs M2A and M2B transported detergent can for example filled in the second pig station MS2A or MS2B and later in one of the two newt stations of the relevant circle can be rinsed out again.
  • FIG. 2 A convenient embodiment of such a pig (e.g. of the newt M2B in FIG. 1) in tandem is in FIG. 2 shown.
  • the tandem pig essentially exists of two preferably the same, generally cylindrical Pig parts 2 and 2 ', respectively, which are made by a relatively thin flexible Link 4 in a defined by the connecting glid Distance A are connected.
  • two pigs of a known type which are used for Mechanical formation of a space with a defined filling volume are interconnected. That from, for example Stainless steel wire or rod made of elastomeric material Link 4 is on the mutually facing End faces of the pig 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 or 8, the one over the entire circumference at the Inner wall of the line L adjacent sealing edge or sealing or Wiping lip has, as is known in the case of newts is.
  • a permanent magnet M or M' on which the above-mentioned initiators for pig detection and generation of signals, e.g. moving the newt, can address.
  • the one of the two pig parts 2, 2 ' The space 9 formed has that between the facing one another End faces of the axially inner peripheral edge parts 8 or 8 ', the circumference of the connecting member 4 and the inner wall of the Line L defines the filling volume for that of the pig the line L flushing or cleaning medium to be pushed. at an outer diameter corresponding to the inner diameter of the line L.
  • D the sealing edge on the pipe or lip of the parts 7, 8 and an outer diameter d of Link 4 should be significantly smaller than D, in particular less than half as large, while the distance A is preferably not greater than 10 times the diameter D.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Road Signs Or Road Markings (AREA)
  • Elimination Of Static Electricity (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.The invention relates to a method for supplying a coating member and a supply system for the particular Series electrostatic coating of workpieces such as for example vehicle bodies according to the preamble of the independent Claims.

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 coating system known from DE 198 30 029 A1 with a supply system of this type for coating of vehicle bodies with frequently changing color material the color materials in the order of the desired Colors introduced into a feed line and through each two pig bodies separated from each other, between them there may be an insulating medium for electrical isolation. The insulating medium can for example consist of cleaning liquid consist.

Ferner ist es aus der 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 DE 197 42 588 A1, the coating material for the serial coating of workpieces to push from a newt to the application organ, whereby the newt in turn from a pressurized one Flushing or other pressure medium is applied. The color material flows through the one 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).State of the art is also a supply line for electrical conductive coating material for electrical isolation with a to clean reciprocating pig bodies (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 specify the one that is accurate and as needed during the coating process variable dosage of the material sprayed from the coating member, for example enables and on the other hand less with a color change Rinsing effort in terms of rinsing media and time required as before.

Diese Aufgabe wird durch die Merkmale der Patentansprüche gelöst.This object is solved by the features of the claims.

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 of the coating material required dosing pump does not need to be rinsed when changing colors as it does not is flowed through by the coating material. Also for them The paint supply line between the pig stations is not a separate one Flushing process required because of the insulating medium and / or the pig bodies are cleaned.

An dem in der Zeichnung dargestelltem Ausführungsbeispiel wird die Erfindung näher erläutert.On the embodiment shown in the drawing the invention is 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 isolation; and
Fig. 2
an expedient 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.1, the color channel 10 of the atomizer Z is over two parallel ink supply circuits A or B to a color changer serving as a color supply device FWA or FWB connected in the usual way. Is between the color channel 10 and the supply circuits A, B. a controlled valve 12A or 12B each switched.

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 color controlled valve 12C is connected to the paint channel 10 of the atomizer Z also for rinsing the atomizer serving detergent system C.

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 to the first pig station Ink supply line ZLA or ZLB and one of the first Pig station leading back to the second pig station Return line RLA or RLB. The feed and return lines each of the two ink supply circuits A and B 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 four pig stations mentioned is a double pig station designed to accommodate two pigs each. Everyone Ink supply circuit A, B contains two pigs, with M1A and M2A or M1B and M2B are designated and between the two 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.There is a metering pump in each of the return lines RLA and RLB PA or PB switched, the direction of rotation reversible is, so that it is optionally in the opposite direction to the first pig station or convey 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 each a controlled valve V4A or V1A. Valves V4B and V1B are controlled in the same way 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 ink supply circuits A and B have one thing in common Expansion tank 16 for the as a sliding medium serving insulating medium associated with the return lines RLA and RLB connected via a line 14A and 14B, respectively which is controlled by a controlled valve V2A, V3A or V2B, V3B in the parallel arrangement shown on the two Sides of the dosing pump PA or PB to the relevant one Return line RLA or RLB is connected. The expansion tank 16 has a slidable for volume change Piston that can be pressurized with compressed air on its back 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 detergent system C already mentioned contains one of one Supply container 18, which also has a volume change displaceable pistons to which compressed air can be applied has line 20 leading to the valve 12C. Parallel to the Line 20 is on the container 18 as a potential isolation serving pigable insulating line 22 connected, the first at its end facing the container 16 Pig station 24 and at a source 26 of detergent (e.g. thinner) end facing 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.To explain the mode of operation, let us first assume that the workpiece e.g. a car body, with from to the paint supply circuit A through the valve 12A Paint material is coated. With this state of the system the first newt M1A is at rest in the first Pigging station MS1A. That for painting and for a practical Reserve quantity (still) required paint volume is located in line section 28 between the first pig station MS1A and the second newt M2A, which is in accordance with the the coating volume decreasing on the first pig station too moved. The rest of the supply line ZLA between the rear of the newt M2A and the second newt station MS2A and the whole connected to the feed line RLA return lines are filled with the insulating medium, that of the dosing pump PA with the current one Paint requirements corresponding, usually variable Delivery rate towards the second pig station MS2A and from there is pumped into the supply line ZLA and as a push medium via the pig M2A that located in line section 28 Presses paint material into the atomizer Z. in this connection Valves V1A and V3A are open while the valves V2A and V4A are closed. The PA metering pump is therefore fed from the expansion tank 16 during the coating, i.e. the amount of paint applied is by means of a 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 are under high voltage during the coating operation, while the color changers FWA and FWB are constantly grounded. The one that is particularly necessary with low-resistance paint material Potential isolation takes place via supply circuits A and B. The required hose length of the lines between the two pig stations correspond to the maximum required Paint volume (including reserve quantity) plus the double the required insulation distance, each by line sections filled with insulating medium initially between the paint column introduced at the second pig station and the first pig station, then between the paint column and two newt stations and finally between the second pig station and the paint column are formed, wherein the latter insulating section during the coating is getting 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 insulating and metering the charge flow at the atomizer Sliding medium can be any flowable, preferably liquid medium can be used that is electrical non-conductive, compatible with paint, as incompressible as possible and is suitable for delivery by a dosing 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 atomizer Z is supplied from circuit A, is the parallel supply circuit B ready for pressing the Paint material for a subsequent coating process, who can join immediately and without wasting time if not an interim rinse because of a color change of 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 preloading circuit B the two newts of this circle are in the second Newt station MS2B. The entire paint supply circuit B is included the insulating medium serving as a sliding medium. By Open one of the color control valves F1, F2, Fx of the color changer FWB also flows through the desired color varnish open valve 30 of the pig station MS2B between the two Newts M2B and M1B while starting the dosing pump PB and opening the valves V2B and V4B with the valve closed V1B insulating medium in a corresponding volume before the Pig M1B removed and pumped into the expansion tank 16 becomes. The quantity of insulation medium removed is therefore determined by the flowing paint replaced while the newt M1B moved towards the first pig station MS1B. The inflowing The amount of colored lacquer is adjusted accordingly by the dosing pump PB measured their delivery rate, and if the desired Volume is filled, the color control valve of the Color changer FWB, valve 30 and valve V2B closed, while valve V1B is opened and valve V4B remains open. As a result, the newt M2B also sets in Direction to the first pig station MS1B in motion. The between required amount of paint clamped in the two pigs becomes an atomizer due to the flow rate of the insulating medium Z transported. The pressing process is finished when the the first pigs M1B have reached the pig station MS1B. The behind this pig of paint ready is over the atomizer Z placed on high voltage potential. The one for electrical isolation the necessary insulation gap exists at this time between the newt M2B and the second newt 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 there is a color change between two coating processes, so here in the preloaded supply circuit B provided coating material has a different color than the coating material previously taken from circle A, is for example in the coating break between the Removing an already painted workpiece and feeding it of the next workpiece (body gap) the high voltage switched off and the paint channel 10 of the atomizer rinsed, in typical rotary atomizers over its main needle. The detergent is through line 20 of the detergent system C by moving the piston of the supply container 16 fed to the atomizer Z. The pig of the detergent system C is in the first during coating operation Pig station 24 and is flushed by the piston of the supply container 16 into the second pig station 25 pressed. The container 16 can then be refilled and then the pig with compressed air into its first pig station 24 be pushed back, so that again the required Isolation distance between the pig stations 24 and 25 exists.

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.A major advantage of the invention is that when changing colors only the areas of the color changer FWA or FWB, the newt stations MS1A, MS2A or MS1B, MS2B and the Atomizer 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.Already while rinsing the atomizer Z or if none Flushing process is required during the coating operation with paint material removal from the circle B begins in Circle A returns the two pigs M1A and M2A with the any remaining paint reserve between them to the second pig station MS2A. For this purpose the direction of rotation the PA metering pump vice versa. The pump now delivers open valves V1A and 4A and closed valves V2A and V3A towards the newt station MS1A and from there in Direction to the second newt station MS2A until finally in circuit A the initial state for preloading the circuit again A results in the manner described above for circle B.

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, the previously preloaded circuit B the lacquer material is pressed over the main needle of the atomizer and in the manner already described for circle A. be sprayed. So while the newt M1B is in the Pig station MS1B is located, the pig M2B through the insulating medium promoted towards atomizer Z. The dosage of the paint material acted upon by the pig again via the metering of the insulating medium by the metering pump PB, with the valves V1B and V3B opened and the Valves V2B and V4B are closed and the applied Paint quantity 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 aforementioned return transport of the two newts of the district A in its second pig station MS2A is during the coating operation of circle B completed. The returned Paint reserve quantity can be in the second pig station MS2A a valve 32 (shown in MS2B) and a return line disposed of or in a conventional manner in the usual ring line the system will be pigged back. Then will the color changer FWA rinsed when a new color is selected has been. If the same color is needed again, the process flow can Immediately start preloading circuit A.

Ist das Spülen des Farbwechslers notwendig, kann dies auch bereits erfolgen, sobald sich die benötigte Farbmenge in der zugehörigen Zuführleitung befindet.If the color changer has to be rinsed, this can also be done already take place 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 electrical isolation Isolation gaps are for each of the two paint supply circuits A and B each have two initiators IN1A and IN2A and IN1B and IN2B provided as shown in one of the respective Minimum insulation distance corresponding distance from the two pig stations are arranged and for example on the appearance of the newts in the relevant areas appealing Generate monitoring signals. If you have more similar Initiators can be positioned variably in front of the entrance of the first Arranging the pig station MS1A or MS1B is one Self-optimization of the paint reserve quantity possible, i.e. this Quantity can depend on what results in the coating practice absolutely necessary minimum can 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 said to be electrical non-conductive, incompressible and compatible with paints Be a sliding medium. In cases where there is conductivity change the insulation medium used over time can, especially by mixing with the paint material, continuous or periodic monitoring of the Insulating medium useful with regard to its conductivity his. 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 insulation medium can be removed from the system and against fresh material can be exchanged. This change can be meaningfully connected to a rinsing 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. Known in the system described here can Pigging bodies are used when these cover the inner walls of the Strip off the respective hose or pipe without leaving any residue. To achieve an additional cleaning effect but it should be useful in circles A and B and / or in To use the C Newts flushing system in a tandem arrangement where the pig between the front and rear sealing edges a space open to the inner walls of the line to take up a Line detergent contains detergent. That for hose cleaning in circles A and B between the sealing edges z. B. the pigs M2A and M2B transported detergent can for example filled in the second pig station MS2A or MS2B and later in one of the two newt stations of the relevant circle can be rinsed out again.

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 Dicht-oder 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 newt M2B in FIG. 1) in tandem is in FIG. 2 shown. Accordingly, the tandem pig essentially exists of two preferably the same, generally cylindrical Pig parts 2 and 2 ', respectively, which are made by a relatively thin flexible Link 4 in a defined by the connecting glid Distance A are connected. In principle can there are two pigs of a known type which are used for Mechanical formation of a space with a defined filling volume are interconnected. That from, for example Stainless steel wire or rod made of elastomeric material Link 4 is on the mutually facing End faces of the pig 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 or 8, the one over the entire circumference at the Inner wall of the line L adjacent sealing edge or sealing or Wiping lip has, as is known in the case of newts is. Inside the middle part 6 of each of the two pig parts 2, 2 'there may be a permanent magnet M or M' on which the above-mentioned initiators for pig detection and generation of signals, e.g. moving the newt, can address. The one of the two pig parts 2, 2 ' The space 9 formed has that between the facing one another End faces of the axially inner peripheral edge parts 8 or 8 ', the circumference of the connecting member 4 and the inner wall of the Line L defines the filling volume for that of the pig the line L flushing or cleaning medium to be pushed. at an outer diameter corresponding to the inner diameter of the line L. D the sealing edge on the pipe or lip of the parts 7, 8 and an outer diameter d of Link 4 should be significantly smaller than D, in particular less than half as large, while the distance A is 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.There are also advantages if you instead of yourself expedient pigs of the system described other media separators used and the coating material the feed lines feeds via different valve stations or extracts. Furthermore, the reduction achievable by the invention can the rinsing effort required for a color change can also be advantageous in coating systems which have no electrical isolation 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.Insofar as it is necessary for electrical isolation the line groups described (at least by piggable hoses formed lines) made of electrical non-conductive material.

Claims (15)

Verfahren zur Versorgung eines Beschichtungsorgans (Z) für die Serienbeschichtung von Werkstücken wie beispielsweise Fahrzeugkarossen mit Beschichtungsmaterial, das von einer Versorgungseinrichtung (FWA, FWB) kommend dem Beschichtungsorgan (Z) durch eine Zuführleitung (ZLA, ZLB) zugeführt wird, die zwischen einer in der Nähe des Beschichtungsorgans (Z) befindlichen ersten Molchstation (MS1A, MS1B) und einer in der Nähe der Versorgungseinrichtung (FWA, FWB) befindlichen zweiten Molchstation (MS2A, MS2B) verläuft,
wobei das Beschichtungsmaterial in der für einen Beschichtungsvorgang vorbestimmten Volumenmenge zwischen Molchen (M1A, M2A; M1B, M2B) zusammen mit einem gesonderten Medium durch die Zuführleitung (ZLA, ZLB) gefördert wird,
insbesondere für die elektrostatische Beschichtung mit niederohmigem Beschichtungsmaterial, das von einer geerdeten Versorgungseinrichtung (FWA, FWB) dem bei der Beschichtung auf Hochspannung gelegten Beschichtungsorgan (Z) zugeführt und hierbei mit einem isolierenden Medium durch die Zuführleitung (ZLA, ZLB) gefördert wird,
dadurch gekennzeichnet, dass das Beschichtungsmaterial von einer Dosierpumpe (PA, PB), durch die nur das als Schiebemedium dienende gesonderte Medium fließt, zu dem Beschichtungsorgan (Z) gefördert wird.Method for supplying a coating member (Z) for the series coating of workpieces such as vehicle bodies with coating material, which comes from a supply device (FWA, FWB) to the coating member (Z) through a feed line (ZLA, ZLB), which is fed between one in the The first pig station (MS1A, MS1B) located near the coating member (Z) and a second pig station (MS2A, MS2B) near the supply device (FWA, FWB),
wherein the coating material is conveyed between the pigs (M1A, M2A; M1B, M2B) in the predetermined volume for a coating process together with a separate medium through the feed line (ZLA, ZLB),
in particular for electrostatic coating with low-resistance coating material, which is fed from an earthed supply device (FWA, FWB) to the coating element (Z) which is connected to high voltage during coating and is conveyed with an insulating medium through the supply line (ZLA, ZLB),
characterized in that the coating material is conveyed to the coating member (Z) by a metering pump (PA, PB) through which only the separate medium serving as a sliding medium flows. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Schiebemedium von der Dosierpumpe (PA, PB) durch die Zuführleitung (ZLA, ZLB) in Richtung zu der ersten Molchstation (MS1A, MS1B) gefördert wird und von dort durch eine zu der zweiten Molchstation (MS2A, MS2B) führende Rückführleitung (RLA, RLB) zurückgefördert wird.A method according to claim 1, characterized in that the pushing medium is conveyed from the metering pump (PA, PB) through the feed line (ZLA, ZLB) towards the first pig station (MS1A, MS1B) and from there through to the second pig station ( MS2A, MS2B) leading return line (RLA, RLB) is returned. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass beim Einführen des Beschichtungsmaterials zwischen die beiden Molche (M1A, M2A; M1B, M2B) eine entsprechende Volumenmenge des Schiebemediums in einen Ausgleichsbehälter (16) gefördert wird.A method according to claim 1 or 2, characterized in that when the coating material is introduced between the two pigs (M1A, M2A; M1B, M2B) a corresponding volume of the pushing medium is conveyed into an expansion tank (16). Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Zu- und Rückführleitungen des Versorgungskreises (A, B) mit Isoliermedium gefüllt werden,
dass das Beschichtungsmaterial an der zweiten Molchstation (MS2A, MS2B) zwischen die beiden Molche (M1A, M1B; M2A, M2B) eingeführt wird,
dass das Beschichtungsmaterial zwischen den Molchen eingeschlossen durch die Zuführleitung (ZLA, ZLB) gefördert wird, bis der in Förderrichtung vordere Molch (M1A, M1B) die erste Molchstation (MS1A, MS1B) erreicht, wobei zu diesem Zeitpunkt die Länge der mit Isoliermaterial gefüllten Leitungsstrecke zwischen dem hinteren Molch (M2A, M2B) und der zweiten Molchstation (MS2A, MS2B) zur Potentialtrennung zwischen dem Beschichtungsorgan (Z) und der Versorgungseinrichtung (FWA, FWB) ausreicht,
und dass das Beschichtungsmaterial dann von der Dosierpumpe (PA, PB) über das Isoliermedium und den hinteren Molch (M2A, M2B) zu dem Beschichtungsorgan (Z) gefördert wird, während der vordere Molch (M1A, M1B) in der ersten Molchstation (MS1A, MS1B) verbleibt. Method according to one of the preceding claims, characterized in that the supply and return lines of the supply circuit (A, B) are filled with 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 enclosed between the pigs is conveyed through the feed line (ZLA, ZLB) until the front pig (M1A, M1B) in the conveying direction reaches the first pig station (MS1A, MS1B), at which point the length of the line section filled with insulating material sufficient between the rear pig (M2A, M2B) and the second pig station (MS2A, MS2B) for potential separation between the coating member (Z) and the supply device (FWA, FWB),
and that the coating material is then conveyed from the metering pump (PA, PB) via the insulating medium and the rear pig (M2A, M2B) to the coating member (Z), while the front pig (M1A, M1B) in the first pig station (MS1A, MS1B) remains. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die beiden Molche (M1A, M2A; M1B, M2B) von der das Schiebemedium mit gegenüber dem Beschichtungsbetrieb umgekehrter Drehrichtung fördernden Dosierpumpe (PA, PB) durch die Zuführleitung (ZLA, ZLB) in die zweite Molchstation (MS2A, MS2B) zurückgebracht werden.Method according to one of the preceding claims, characterized in that the two pigs (M1A, M2A; M1B, M2B) from the metering pump (PA, PB) conveying the pushing medium with the direction of rotation reversed in relation to the coating operation through the feed line (ZLA, ZLB) into the second pig station (MS2A, MS2B). Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass während der Beschichtung eines Werkstücks mit Beschichtungsmaterial aus der Zuführleitung (ZLA) eines ersten Versorgungskreises (A) ein zweiter Versorgungskreis (B) mit ähnlichen Zu- und Rückführleitungen (ZLB, RLB) und Molchstationen (MS1B, MS2B) und einer Dosierpumpe (BB) für einen nachfolgenden Beschichtungsvorgang vorbereitet wird, wobei das Beschichtungsmedium des zweiten Versorgungskreises (B) durch dessen Zuführleitung (ZLB) gefördert wird, bis der vordere Molch (M1B) seine erste Molchstation (MS1B) erreicht hat.Method according to one of the preceding claims, characterized 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, the coating medium of the second supply circuit (B) being conveyed through its feed line (ZLB) until the front pig (M1B) has reached its first pig station (MS1B) , Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Dosierpumpe (PA, PB) das Schiebemedium mit sich während der Beschichtung entsprechend der momentan jeweils benötigten Beschichtungsmaterialmenge änderndem Durchsatz fördert.Method according to one of the preceding claims, characterized in that the metering pump (PA, PB) conveys the sliding medium with a throughput which changes during the coating in accordance with the amount of coating material currently required in each case. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass ein Molch (M1A, M2A, M1B, M2B) verwendet wird, der zwischen vorderen und hinteren Dichtkanten (8, 8') einen zu den Leitungsinnenwänden offenen Zwischenraum (9) zur Aufnahme eines die Leitung reinigenden Spülmittels enthält, und dass das Spülmittel in einer der Molchstationen (MS2A, MS2B, 24, 25) in den Zwischenraum (9) eingefüllt und nach Gebrauch in einer der Molchstationen wieder herausgespült wird.Method according to one of the preceding claims, characterized in that a pig (M1A, M2A, M1B, M2B) is used which between the front and rear sealing edges (8, 8 ') an intermediate space (9) open to the inner walls of the conduit for receiving a die Line cleaning detergent contains, and that the detergent is filled in one of the pig stations (MS2A, MS2B, 24, 25) in the space (9) and washed out after use in one of the pig stations. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die elektrische Leitfähigkeit des isolierenden Schiebemediums kontinuierlich oder periodisch gemessen oder ermittelt wird und das Schiebemedium bei Überschreiten eines vorbestimmten Leitfähigkeitswertes gegen frisches Material ausgetauscht wird.Method according to one of the preceding claims, characterized in that the electrical conductivity of the insulating sliding medium is measured or determined continuously or periodically and the sliding medium is exchanged for fresh material when a predetermined conductivity value is exceeded. Versorgungssystem für die insbesondere elektrostatische Serienbeschichtung von Werkstücken wie beispielsweise Fahrzeugkarossen mit insbesondere niederohmigen Beschichtungsmaterial, das von einer Versorgungseinrichtung (FWA, FWB) kommend dem Beschichtungsorgan (Z) durch eine Zuführleitung (ZLA, ZLB) zugeführt wird, die zwischen einer in der Nähe des Beschichtungsorgans (Z) befindlichen ersten Molchstation (MS1A, MS1B) und einer in der Nähe der Versorgungseinrichtung (FWA, FWB) befindlichen zweiten Molchstation (MS2A, MS2B) verläuft,
dadurch gekennzeichnet, dass das an der ersten Molchstation (MS1A, MS1B) befindliche Ende der Zuführleitung (ZLA, ZLB) mit dem an der zweiten Molchstation (MS2A, MS2B) befindlichen Ende der Zuführleitung durch eine Rückführleitung (RLA, RLB) verbunden ist, die eine Dosierpumpe (PA, PB) enthält, durch die nur ein als Schiebemedium für das Beschichtungsmaterial dienendes gesondertes Medium fließt.Supply system for the in particular electrostatic series coating of workpieces such as vehicle bodies with, in particular, low-resistance coating material, which comes from a supply device (FWA, FWB) to the coating member (Z) through a feed line (ZLA, ZLB) which is fed between one in the vicinity of the coating member (Z) the first pig station (MS1A, MS1B) and a second pig station (MS2A, MS2B) located near the supply device (FWA, FWB),
characterized in that the end of the feed line (ZLA, ZLB) located at the first pig station (MS1A, MS1B) is connected to the end of the feed line located at the second pig station (MS2A, MS2B) by a return line (RLA, RLB) which contains a metering pump (PA, PB) through which only a separate medium serving as a sliding medium for the coating material flows. Versorgungssystem nach Anspruch 10, dadurch gekennzeichnet, dass aus der Rückführleitung (RLA, RLB) eine zu einem Ausgleichsbehälter (16) für das Schiebemedium führende Leitung (14A, 14B) abzweigt. Supply system according to Claim 10, characterized in that a line (14A, 14B) leading to an expansion tank (16) for the sliding medium branches off from the return line (RLA, RLB). Versorgungssystem nach Anspruch 11, dadurch gekennzeichnet, dass die zu dem Ausgleichsbehälter (16) führende Leitung (14A, 14B) über je ein steuerbares Ventil (V2A, V3A, V2B, V3B) auf beiden Seiten der Dosierpumpe (PA, PB) an die Rückführleitung (RLA, RLB) angeschlossen ist, und dass die Rückführleitung steuerbare Ventile (V1A, V4A, V1B, V4B) zwischen der Dosierpumpe und den beiden Molchstationen (MS1A, MS2A, MS1B, MS2B) enthält.Supply system according to claim 11, characterized in that the line (14A, 14B) leading to the expansion tank (16) via a controllable valve (V2A, V3A, V2B, V3B) on both sides of the metering pump (PA, PB) to the return line (RLA, RLB) is connected, and that the return line contains controllable valves (V1A, V4A, V1B, V4B) between the metering pump and the two scraper stations (MS1A, MS2A, MS1B, MS2B). Versorgungssystem nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass zwei gleiche Versorgungskreise (A, B) mit jeweils den beiden Molchstationen (MS1A, MS2A; MS1B, MS2B) den Zu- und Rückführleitungen (ZLA, RLA; ZLB, RLB) und der Dosierpumpe (PA, PB) parallel an das Beschichtungsorgan (Z) angeschlossen sind.Supply system according to one of claims 10 to 12, characterized in that two identical supply circuits (A, B), each with the two pig stations (MS1A, MS2A; MS1B, MS2B), the supply and return lines (ZLA, RLA; ZLB, RLB) and the dosing pump (PA, PB) are connected in parallel to the coating element (Z). Versorgungssystem nach Anspruch 13, dadurch gekennzeichnet, dass ein gemeinsamer Ausgleichsbehälter (16) für das Isoliermedium mit beiden Versorgungskreisen (A, B) verbunden ist.Supply system according to claim 13, characterized in that a common expansion tank (16) for the insulating medium is connected to both supply circuits (A, B). Versorgungssystem nach einem der Ansprüche 10 bis 14, dadurch gekennzeichnet, dass an das Beschichtungsorgan (Z) zum Spülen bei einem Farbwechsel ein gesondertes Spülmittelsystem (C) angeschlossen ist, das eine zwischen zwei Molchstationen (24, 25) molchbare Spülmittelzuführleitung (22) als Isolierstrecke zur Potentialtrennung während des Beschichtungsvorgangs enthält.Supply system according to one of claims 10 to 14, characterized in that a separate detergent system (C) is connected to the coating member (Z) for rinsing during a color change, which has a detergent supply line (22) which can be pigged between two pig stations (24, 25) as an insulating section for potential 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)

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DE10033987 2000-07-13

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US7328123B2 (en) 2002-09-30 2008-02-05 Durr Systems, Inc. System for collision avoidance of rotary atomizer
US6991178B2 (en) 2003-01-24 2006-01-31 Dürr Systems, Inc. Concentric paint atomizer shaping air rings
EP1452791A1 (en) * 2003-02-28 2004-09-01 Eisenmann Lacktechnik KG, (Komplementär: Eisenmann-Stiftung) Sensor device on a supply conduit under high voltage
EP1500435A2 (en) 2003-07-23 2005-01-26 Dürr Systems GmbH Method and device for the potential control of a pigged pipes arrangement
EP1522348A3 (en) * 2003-10-07 2008-01-23 Dürr Systems GmbH Method and system for feeding material to a consumer device over a pigged path
WO2006113213A1 (en) * 2005-04-13 2006-10-26 Illinois Tool Works Inc. Shuttle push system for coating applicators
US8671495B2 (en) 2006-11-06 2014-03-18 Durr Systems, Inc. Scraper pig
WO2010075322A1 (en) * 2008-12-23 2010-07-01 Abb Inc. Paint shuttle system
EP2361691A1 (en) 2010-02-19 2011-08-31 Ramseier Koatings Technologies AG Switch for fluids
EP3639929A1 (en) * 2018-10-19 2020-04-22 Exel Industries Installation for spraying fluid and associated method
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EP4255641B1 (en) * 2022-03-18 2024-04-17 Dürr Systems AG Coating installation and associated operating method having a simulation of the amount of coating agent required

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DE50100509D1 (en) 2003-09-25
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ES2204785T3 (en) 2004-05-01
ATE247527T1 (en) 2003-09-15

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