EP0021182B2 - Method and apparatus for supplying paint to painting installations - Google Patents

Method and apparatus for supplying paint to painting installations Download PDF

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Publication number
EP0021182B2
EP0021182B2 EP80103148A EP80103148A EP0021182B2 EP 0021182 B2 EP0021182 B2 EP 0021182B2 EP 80103148 A EP80103148 A EP 80103148A EP 80103148 A EP80103148 A EP 80103148A EP 0021182 B2 EP0021182 B2 EP 0021182B2
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EP
European Patent Office
Prior art keywords
paint
pressure
spraying
paint material
pressure vessel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
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EP80103148A
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German (de)
French (fr)
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EP0021182A1 (en
EP0021182B1 (en
Inventor
Hagen Dr. Buchholz
Friedrich Dr. Vock
Hans-Dieter Johannsmeier
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BASF Farben und Fasern AG
Original Assignee
BASF Farben und Fasern AG
BASF Lacke und Farben AG
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Application filed by BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Priority to AT80103148T priority Critical patent/ATE2167T1/en
Publication of EP0021182A1 publication Critical patent/EP0021182A1/en
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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
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0423—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material for supplying liquid or other fluent material to several spraying apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1481—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet comprising pigs, i.e. movable elements sealingly received in supply pipes, for separating different fluids, e.g. liquid coating materials from solvent or air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B05B9/0406—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material with several pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2931—Diverse fluid containing pressure systems
    • Y10T137/3115—Gas pressure storage over or displacement of liquid
    • Y10T137/3127—With gas maintenance or application
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/4673—Plural tanks or compartments with parallel flow
    • Y10T137/4841—With cross connecting passage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/85954—Closed circulating system

Abstract

Spray paint lines, in particular the spray sites in spray booths of auto assembly lines, are provided with the paint material by means of a pump delivering the paint material into the main ring. The pressure level required for spraying the paint is adjusted by means of a pressurized vessel and a pressurized gas above the liquid level. A second pump conveys fresh paint material into the pressurized vessel.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Versorgung von Lackierstraßen mit Lackmaterial gemäß dem Oberbegriff des Hauptanspruches.The invention relates to a method for supplying paint lines with paint material according to the preamble of the main claim.

Aus der US-A-3893625 ist ein Verfahren zur Versorgung von Lackierstraßen mit Lackmaterial bekannt, bei welchem drei verschiedene Flüssigkeitsbehälter mit unterschiedlichem Druck die Zirkulation der Sprühflüssigkeit in Gang halten. Die Zwischenreinigung einer derartigen Anlage ist aufwendig, und der Volumenstrom des Lackmaterials in der Leitung ist nur schwierig aufrechtzuerhalten, insbesondere dann, wenn die Leitungen lang un eine Vielzahl von Spritzstellen vorgesehen ist. Die Druckstabilisierung über die gesamte Strecke bereitet ebenfalls Schwierigkeit, wobei als besonders nachteilig empfunden wurde, daß die gesamte Anlage nur mit Druckintervallen arbeiten kann, da der Rückfluß des Lackmaterials aus dem eigentlichen Druckbehälter nach Durchfließen der Spritzstellen in einen Sammelbehälter gelangt, der drucklos ist. Zwischen diesem Sammelbehälter und dem Druckbehälter ist ein Sperrtank eingeschaltet, der wahlweise unter einen Druck gesetzt wird, der dem Druck des Druckbehälters entspricht oder drucklos gemacht wird und damit dem Druck im Sammelbehälter entspricht. Eine solche Arbeitsweise erschwert eine kontinuierliche Bedienung der Spritzpistolen.From US-A-3893625 a method for supplying paint lines with paint material is known, in which three different liquid containers with different pressure keep the circulation of the spray liquid going. The intermediate cleaning of such a system is complex and the volume flow of the paint material in the line is difficult to maintain, especially when the lines are long un a variety of spraying points. The pressure stabilization over the entire route also presents difficulties, although it was found to be particularly disadvantageous that the entire system can only work with pressure intervals, since the reflux of the coating material from the actual pressure vessel, after flowing through the spraying points, reaches a collecting vessel that is depressurized. Between this collecting container and the pressure container, a blocking tank is switched on, which is optionally put under a pressure that corresponds to the pressure of the pressure container or is depressurized and thus corresponds to the pressure in the collecting container. Such a mode of operation makes continuous operation of the spray guns difficult.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Versorgung von Lackierstraßen mit Lackmaterial zu schaffen, bei welchem ein im wesentlichen konstanter Druck im System aufrechterhalten werden kann, die Zwischenreinigung der Leitung und Behälter leicht gestaltet ist und gleichzeitig sichergestellt ist, daß ein möglichst konstanter Volumenstrom zur Verfügung steht.The invention has for its object to provide a method for supplying paint lines with paint material, in which a substantially constant pressure can be maintained in the system, the intermediate cleaning of the line and container is easy and at the same time it is ensured that the volume flow is as constant as possible is available.

Diese der Erfindung zugrundeliegende Aufgabe wird durch die im kennzeichnenden Teil des Anspruches 1 genannten Merkmale gelöst. Die Erfindung bezieht sich weiterhin auf ein Verfahren zur Versorgung von Lackierstraßen, insbesondere der Spritzstellen in Spritzkabinen mit Lackmaterial, wobei eine Rohrstrecke für die Lackversorgung der Lackspritzstellen verwendet wird, die an beiden Enden einen Druckbehälter besitzen, wobei die Druckbehälter mit einem Druckgas über eine Steuerung so beaufschlagt werden, daß das Lackmaterial reversierend durch die Rohrleitung gefördert wird.This object on which the invention is based is achieved by the features mentioned in the characterizing part of claim 1. The invention further relates to a method for supplying painting lines, in particular the spraying points in spray booths with coating material, a pipe section being used for supplying the coating spraying points which have a pressure vessel at both ends, the pressure vessel with a pressure gas via a controller in this way be applied that the paint material is reversely conveyed through the pipeline.

Eine solche Anordnung ist aus der US-A-2 542-855 bekannt.Such an arrangement is known from US-A-2 542-855.

Bei einer derartigen Einrichtung mit reversierender Förderung des Lackmaterials in einer Rohrleitung besteht die Gefahr von Ablagerungen und Ansätzen, die nach relativ kurzer Zeit die einwandfreie Wirkungsweise der Gesamtanlage in Frage stellen können.With such a device with reversing conveyance of the paint material in a pipeline, there is a risk of deposits and deposits which, after a relatively short time, can jeopardize the perfect functioning of the overall system.

Der Erfindung liegt weiterhin die Aufgabe zugrunde, bei einer Verfahrensweise gemäß der US-A-2542855 derartige Blockierungen und Strömungswiderstände zu vermeiden.The invention is also based on the object of avoiding such blockages and flow resistances in a procedure according to US-A-2542855.

Diese der Erfindung zugrundeliegende Aufgabe wird dadurch gelöst, daß ein Rohrmolch in der Rohrleitung eingesetzt wird, der mit dem Lackmaterial reversierend durch das Rohr getrieben wird und an den Stellen zwischen den Schlauchanschlüssen einer Spritzstelle eine intermittierend betriebene Haltevorrichtung für den Rohrmolch vorgesehen ist, die den Rohrmolch zeitweise anhält, so daß hierdurch Lackmaterial durch die Schlauchanschlüsse zur Spritzpistole strömen kann.This object of the invention is achieved in that a pipe pig is used in the pipeline, which is driven reversibly with the paint material through the pipe and an intermittently operated holding device for the pipe pig is provided at the locations between the hose connections of a spraying point, which is the pipe pig temporarily stops, so that paint material can flow through the hose connections to the spray gun.

Durch diese Verfahrensweise wird nicht nur der freie Strömungsquerschnitt der Leitung erhalten, sondern gleichzeitig ein kostengünstiges Steuermittel für die Steuerung der Schlauchanschlüsse erreicht.This procedure not only maintains the free flow cross-section of the line, but at the same time an inexpensive control means for controlling the hose connections is achieved.

Die die erfindungsgemäße Vorrichtung kennzeichnenden Einrichtungen sind in den Vorrichtungsansprüchen definiert.The devices characterizing the device according to the invention are defined in the device claims.

Ausführungsbeispiele der Erfindung werden anhand der Zeichnungen erläutert. Die Zeichnungen zeigen dabei in

  • Figur 1 eine Zirkulationsringleitung mit Druckhaltung durch Stickstoffpolster, in
  • Figur 2 eine Lackpendelleitung, die an beiden Enden mit einem Druckgefäß ausgerüstet ist, in Figur 3 eine Lackpendelleitung mit Spülung der Spritzanschlüsse, in
  • Figur 4 die Anordnung eines Rohrmolches und in den
  • Figuren 5 und 6 Druckdiagramme der Anlagen entsprechend Fig. 1 bzw. 2.
Embodiments of the invention are explained with reference to the drawings. The drawings show in
  • 1 shows a circulation ring line with pressure maintenance by nitrogen cushion, in
  • FIG. 2 shows a paint suspension line which is equipped with a pressure vessel at both ends, in FIG
  • Figure 4 shows the arrangement of a pig and in the
  • FIGS. 5 and 6 are pressure diagrams of the systems corresponding to FIGS. 1 and 2.

Bei der Anordnung gemäß Fig. 1 ist eine Ringleitungsanlage 1 vorgesehen, die im wesentlichen aus einem Rohr bestehen kann, in dem mit einer Umwälzpumpe 2 das Lackmaterial zirkulierend gefördert wird. Ausgangspunkt und Endpunkt dieser Ringleitungsanlage 1 ist eine Druckbehälter 3, aus dem die Umwälzpumpe 2 Lackmaterial abzieht und wieder hineinfördert.In the arrangement according to FIG. 1, a ring line system 1 is provided, which may consist essentially of a tube in which the paint material is circulated with a circulation pump 2. The starting point and end point of this ring line system 1 is a pressure vessel 3, from which the circulation pump 2 draws paint material and feeds it back in.

Wesentlich ist, daß über dem Flüssigkeitsspiegel innerhalb des Druckbehälters 3 ein erhöhter Druck mit einem Druckgas eingestellt wird. Dieser erhöhte statische Druck herrscht im gesamten Ringleitungssystem und er sollte so hoch sein, daß an jeder Spritzstelle 4 ein ausreichendes Druckniveau vorhanden ist. Die Umwälzpumpe 2 muß bei diesem Anlagenkonzept nur den dynamischen Druckabfall als Folge der Rohrströmung aufbringen und nicht, wie in bisher üblichen Anlagen die Summe aus dynamischem Druckabfall und statischem Druck. Weiterhin entfällt das Rücklaufkontrollventil, das in bisherigen Anlagen den Lackrücklaufstrom um 3 bis 5 bar drosseln muß.It is essential that an elevated pressure is set with a compressed gas above the liquid level within the pressure vessel 3. This increased static pressure prevails in the entire ring line system and it should be so high that a sufficient pressure level is present at each spray point 4. In this system concept, the circulation pump 2 only has to apply the dynamic pressure drop as a result of the pipe flow and not, as in previous systems, the sum of the dynamic pressure drop and static pressure. Furthermore, there is no return control valve, which in previous systems has to reduce the paint return flow by 3 to 5 bar.

Ein Niveaustandregler für die Lackmenge im Druckbehälter 3 sorgt dafür, daß über einen drucklosen Lackansatzbehälter 5 und über eine zweite aber kleinere Pumpe 6 frisches Lackmaterial dem Drucksystem zugeführt wird. Diese Pumpe 6 hat den vollen statischen Drucksprung zu überwinden, jedoch wird das Lackmaterial nur einmal mit dieser Pumpe gefördert. Die Rohrleitungslänge dieses Anlagenkonzeptes würde der Länge der bisherigen Anlagen entsprechen. Wesentlicher Vorteil dieser Ausführungsform ist, daß das Lackmaterial mit einer wesentlich verringerten Scherbeanspruchungsintensität umgewälzt wird. Zudem kann der Vordruck an den Spritzstellen 4 besser konstant gehalten werden. Als Druckgas kann Stickstoff eingesetzt werden. Hierbei sind bisherige oxidative Einflüsse auf das Lackmaterial beseitigt.A level controller for the amount of paint in the pressure vessel 3 ensures that fresh paint material is fed to the printing system via an unpressurized paint batch container 5 and a second but smaller pump 6. These Pump 6 has to overcome the full static pressure jump, but the coating material is only conveyed once with this pump. The pipe length of this system concept would correspond to the length of the previous systems. A major advantage of this embodiment is that the paint material is circulated with a significantly reduced shear stress intensity. In addition, the pre-pressure at the injection points 4 can be kept constant better. Nitrogen can be used as the compressed gas. Previous oxidative influences on the paint material have been eliminated.

Das Druckdiagramm für diese Anlage geht aus Fig. 5 hervor. Der Lackansatzbehälter 5 ist drucklos, d. h. hier herrscht der Druck a. Der Druck wird dann über die Kolbenpumpe 6 angehoben auf den Wert c. Bei den mit d bezeichneten Bereichen sind die Druckstellen für die Spritzpistolen angeordnet und in diesem Bereich wird der Druck über Materialdruckregler 7 gemäß Fig. 1 auf den Spritzdruck h eingeregelt.The pressure diagram for this system is shown in FIG. 5. The paint batch container 5 is depressurized, i. H. here there is pressure a. The pressure is then raised to the value c via the piston pump 6. In the areas denoted by d, the pressure points for the spray guns are arranged and in this area the pressure is adjusted to the spray pressure h via material pressure regulator 7 according to FIG. 1.

Fig. 2 zeigt eine Anlage mit an beiden Enden des Druckbehälters angeordneten Druckgefäßen.Fig. 2 shows a system with pressure vessels arranged at both ends of the pressure vessel.

Bei dieser Anlage ist eine Rohrstrecke L2 vorgesehen, die keine gesonderte Rückführung aufweist, so daß nur die halbe Rohrlänge gegenüber der in Fig. 1 dargestellten Anlage erforderlich ist. Jedoch sind bei dieser Anlage zwei Druckbehälter B2 und B3 vorgesehen, die an den beiden Enden der Rohrstrecke L2 angeordnet sind. Das Lackmaterial wird unter erhöhtem statischen Druck, der durch ein Gasdruckpolster über dem jeweiligen Flüssigkeitsspiegel in den Druckbehältern B2 und B3 erzeugt wird, reversierend in der Rohrstrecke L2 hin- und hergefördert. Hierzu wird einmal der Gasdruck in dem Behälter B2 etwas höher eingestellt als der Gasdruck in dem Druckbehälter B3 und anschließend umgekehrt. Über Niveaustandregler in den beiden Druckbehältern werden die -Druckumschaltzyklen so gesteuert, daß mit Sicherheit ein Gasdurchschlag in der Rohrstrecke L2 vermieden wird. Die Volumen der Behälter B2 und B3 sollten ein- bis zweimal größer sein als das eigentliche Rohrvolumen der Strecke L2, um somit das im Rohr befindliche Material nach jedem Reversierzyklus voll auszutauschen und zurückzuvermischen.In this system, a pipe section L2 is provided which has no separate return, so that only half the pipe length compared to the system shown in Fig. 1 is required. However, two pressure vessels B2 and B3 are provided in this system, which are arranged at the two ends of the pipe section L2. The coating material is reversely conveyed back and forth in the pipe section L2 under increased static pressure, which is generated by a gas pressure cushion above the respective liquid level in the pressure vessels B2 and B3. For this purpose, the gas pressure in the container B2 is set somewhat higher than the gas pressure in the pressure container B3 and then vice versa. The pressure switching cycles are controlled by level regulators in the two pressure vessels in such a way that a gas breakdown in the pipe section L2 is avoided with certainty. The volumes of the containers B2 and B3 should be one or two times larger than the actual pipe volume of the section L2, so that the material in the pipe can be fully exchanged and mixed back after each reversing cycle.

Durch den Reversierzyklus wird die Rohrleitung nicht nur in einer Richtung, sondern in beiden Richtungen abwechselnd durchströmt. Dies verhindert in noch höherem Maße Ablagerungen von Partikeln an der Rohrwandung und insbesondere an Flanschstellen und ähnlichen unebenen Übergängen. Weiterhin entsteht durch die beim Reversieren ständig erzeugten Anlaufströmungen zeitweise turbulentes Strömungsverhalten, welches das Absetzen von Partikeln in starkem Maße verhindert. Hiermit besteht die Möglichkeit zu kleineren mittleren Strömungsgeschwindigkeiten von beispielsweise unter 0,3 m/s überzugehen. Weiterhin ist die Möglichkeit gegeben, nicht ständig zu reversieren, sondern im Takt mit Stillstandsintervallen.The reversing cycle does not only flow through the pipeline in one direction, but alternately in both directions. This prevents deposits of particles to an even greater extent on the pipe wall and in particular on flange points and similar uneven transitions. Furthermore, the start-up flows that are constantly generated during reversing sometimes create turbulent flow behavior, which prevents particles from settling to a large extent. This makes it possible to switch to lower average flow velocities of, for example, less than 0.3 m / s. Furthermore, there is the possibility of not reversing constantly, but at intervals with standstill intervals.

Die Druckgasversorgung der Druckbehälter B2 und B3 erfolgt über die Druckgasbehälter B4 und B5 sowie die Leitungen L3, L4, L5 und L6. Mit K ist ein Kompressor bezeichnet, der das Druckgas mit der Druckstufe h aus dem Druckbehälter B4 in den Druckbehälter B5 auf die Druckstufe i komprimiert.The pressure gas supply to the pressure vessels B2 and B3 takes place via the pressure gas vessels B4 and B5 and the lines L3, L4, L5 and L6. K designates a compressor which compresses the compressed gas with the pressure stage h from the pressure vessel B4 into the pressure vessel B5 to the pressure stage i.

In Fig. 2 sind 3-Wegeventile V2 und V3 eingezeichnet, die von den Niveaustandsreglern der Druckbehälter B2 und B3 gesteuert werden, wobei diese 3-Wegeventile die Druckbehälter B2 und B3 abwechselnd mit dem höheren Gasdruck i aus dem Druckbehälter B4 bzw. dem niedrigeren Gasdruck h aus dem Druckbehälter B5 beaufschlagen. Die wirksame Druckdifferenz (Druck i minus Druck h) ist für die mittlere Strömungsgeschwindigkeit in der Leitung L2 verantwortlich, während der Druck h gleich dem niedrigsten statischen Druck im Versorgungssystem entspricht, der als konstanter Vordruck an den Spritzstellen wirkt (siehe Fig. 6).In Fig. 2 3-way valves V2 and V3 are drawn, which are controlled by the level regulators of the pressure vessels B2 and B3, these 3-way valves the pressure vessels B2 and B3 alternating with the higher gas pressure i from the pressure vessel B4 or the lower gas pressure Actuate h from pressure vessel B5. The effective pressure difference (pressure i minus pressure h) is responsible for the mean flow velocity in line L2, while the pressure h corresponds to the lowest static pressure in the supply system, which acts as a constant pre-pressure at the spray points (see Fig. 6).

Der Kompressor K mit den zugeordneten Druckgasbehältern B4 und B5 kann mehrere Lackversorgungsanlagen gleichzeitig versorgen und braucht daher nur einmal installiert zu werden. Da das Druckgas im Kreis gefahren wird, sind die Gasverluste sowie auch die Lösungsmittelverluste gering und es ist zu empfehlen, Stickstoff als Gas einzusetzen.The compressor K with the associated pressurized gas containers B4 and B5 can supply several paint supply systems simultaneously and therefore only needs to be installed once. Since the compressed gas is circulated, the gas losses as well as the solvent losses are low and it is recommended to use nitrogen as the gas.

Stickstoff erhöht die Betriebssicherheit der Druckbehälter B2 und B3 und verhindert oxidative Veränderungen am Lackmaterial.Nitrogen increases the operational safety of pressure vessels B2 and B3 and prevents oxidative changes to the paint material.

Die Niveaustandsregler der Druckbehälter B2 und B3 sorgen weiterhin dafür, daß das beim Spritzen verbrauchte Lackmaterial aus dem Lackansatzbehälter B1 in dem Atmosphärendruck a herrscht über die Pumpe P in ausreichender Menge als frischer Lack dem Drucksystem über die Leitung L1 zugeführt wird.The level regulators of the pressure vessels B2 and B3 also ensure that the paint material used during spraying from the paint preparation tank B1 in the atmospheric pressure a prevails via the pump P in sufficient quantity as fresh paint is fed to the pressure system via the line L1.

Sind in der Lackierstraße Spritzstellen S enthalten, die nur selten in Funktion sind, da sie z. B. für Lackmaterialien mit selten benutzten Farbtönen eingesetzt werden, dann sind die Stichleitungen und Schlauchleitungen von der Ringleitung bzw. Pendelleitung bis zur Spritzpistole mit Lackmaterial zu spülen, um ein Absetzen von Partikeln zu verhindern.Are spraying points S included in the painting line, which are seldom in operation, since they e.g. B. are used for paint materials with rarely used colors, then the stub lines and hose lines from the ring line or pendulum line to the spray gun with paint material to be rinsed to prevent particles from settling.

Die ggf. erforderlichen Materialdruckregler sind in Fig. 2 mit V1 bezeichnet.The material pressure regulators that may be required are designated V1 in FIG. 2.

Fig. 3 zeigt schließlich eine Lösung mit Spülung der Spritzstellenanschlüsse.3 finally shows a solution with flushing of the spray point connections.

In der Pendelleitung L12 werden zwischen die Stichleitungen und Schlauchanschlüsse d111 bis d142 Magnetventile V111 bis V114 eingesetzt. Diese Magnetventile sind zeitweise entweder ganz offen oder ganz geschlossen. Es erfolgt dann keine Drosselung des Lackstromes. Es darf jedoch immer nur ein einziges Magnetventil zeitweise geschlossen sein. Die Steuerung, welches Magnetventil wann und wie lange geschlossen wird, kann von einer Zeitschaltuhr vorgenommen werden. Es ist hierbei belanglos, ob der Lackstrom in der Pendelleitung von rechts nach links oder umgekehrt erfolgt. Wesentlich ist, daß bei geschlossenem Magnetventil der Differenzdruck in den Druckbehältern B12 bzw. B13 eine Lackströmung in der Stichleitung bis zur Spritzpistole einleitet. Es ist ausreichend, wenn an jeder Spritzstelle diese Strömung in Zeitintervallen für kurze Zeit erzeugt wird. Die Druckminderventile V411 sind direkt an der Spritzpistole befestigt. Die Lackversorgung der Spritzpistole ist in jedem Fall sichergestellt, gleichgültig, ob das korrespondierende Magnetventil geschlossen oder geöffnet ist. Mit der Zeitschaltuhr können die Intervalle und die Schließzeiten der Magnetventile individuell auf das Lackmaterial eingestellt werden.In the pendulum line L12, solenoid valves V111 to V 114 are inserted between the branch lines and hose connections d 111 to d 142 . These solenoid valves are either completely open or completely closed at times. There is then no throttling of the paint flow. However, only one solenoid valve may be temporarily closed. A timer can control which solenoid valve is closed, when and for how long. It is irrelevant whether the paint flow in the pendulum line is from right to left or vice versa. It is essential that when the solenoid valve is closed, the differential pressure in the pressure vessels B12 and B13 initiates a paint flow in the branch line to the spray gun. It is sufficient if this flow is generated at time intervals for a short time at each spray point. The V 411 pressure reducing valves are attached directly to the spray gun. The paint supply to the spray gun is ensured in all cases, regardless of whether the corresponding solenoid valve is closed or open. With the timer, the intervals and the closing times of the solenoid valves can be individually adjusted to the paint material.

Die übrigen Bauteile der Anordnung gemäß Fig. 3 tragen die gleichen Bezugszeichen, wie die Anordnung gemäß Fig. 2.The other components of the arrangement according to FIG. 3 have the same reference numerals as the arrangement according to FIG. 2.

Bei der Anordnung gemäß Fig. 4 sind zwei mögliche Steuerungen für einen sogenannten Rohrmolch M dargestellt. Bei einer Anordnung wird der Rohrmolch über eine mechanische Stößelanordnung 10 gesteuert, während bei der anderen Anordnung eine magnetische Blockiereinrichtung für den einen Eisenkern aufweisenden Rohrmolch M vorgesehen ist.In the arrangement according to FIG. 4, two possible controls for a so-called pipe pig M are shown. In one arrangement, the pipe pig is controlled by a mechanical tappet arrangement 10, while in the other arrangement a magnetic blocking device is provided for the pipe pig M having an iron core.

Der Rohrmolch hat die Aufgabe, die Pendelleitung von Ansätzen und Ablagerungen freizuhalten. Er kann dies bei sehr kleinen Strömungsgeschwindigkeiten ausführen und muß diese Aufgabe bei reversierender Bewegung durchführen.The newt has the task of keeping the pendulum line free of deposits and deposits. He can do this at very low flow velocities and must do this with reversing motion.

Der Rohrmolch soll gleichzeitig die Magnetventile ersetzen. Dies kann er, wenn er zwischen den Stichleitungen zu den Spritzpistolen zeitweise angehalten wird und dabei die Hauptströmungsrichtung in der Pendelleitung blockiert, so daß der Lackstrom über die Stichleitung erfolgen muß. Das Anhalten und zeitweise Festhalten des Rohrmolches an bestimmten Positionen der Pendelleitung kann beispielsweise über eine Induktionsspule oder eine mechanische Vorrichtung durchgeführt werden.The pig will replace the solenoid valves at the same time. He can do this if he is temporarily stopped between the stub lines to the spray guns and thereby blocks the main flow direction in the pendulum line, so that the paint flow must take place via the stub line. The pipe pig can be stopped and temporarily held at certain positions on the pendulum line, for example by means of an induction coil or a mechanical device.

Claims (6)

1. Process for supplying painting lines with paint material, in which the paint material is circulated in a ring main (1) provided with connections for spraying points (4) and the pressure level required for paint-spraying is set using a pressure vessel (3) and a pressurising gas above the liquid level and fresh paint material is fed to the pressure vessel by means of a pressurized refilling system, characterized in that the static pressure is set by means of the pressure vessel (3), which is the starting point and the end point of the ring main (1), and the circulation in the ring main (1) of the spraying liquid is effected by a circulation pump (2).
2. Process according to Claim 1, characterised in that nitrogen is used as the pressurising gas.
3. Process for supplying painting lines, in particular the spraying points (S) in spray booths, with paint material, in which a length of pipe (L2) used for supplying the paint-spraying points with paint has a pressure vessel (B2, B3) at both ends, the pressure vessels being subjected to a pressurising gas via a control system in such a way that the paint material is conveyed in alternating directions through the pipe (L2), characterised in that a pig (M) is inserted in the pipe (L2), which pig is alternately driven through the pipe by the paint material and, at the points between the hose connections of a spraying point, an intermittently operated holding device (for example 10) for the pig is provided, temporarily stopping the pig so that paint material can flow through the hose connections to the spray gun.
4. Process according to Claim 3, characterised in that the spray guns are connected via two hoses (d111) to the same alternating-flow paint line (L12) and, between the two connections, a solenoid valve (V111) is provided which is fully closed and fully opened at intervals by means of a time switch, whereby the feed hoses and return hoses are cyclically and alternately flushed with paint material up to the spray gun.
5. Device for supplying painting lines with paint material, with a ring main (1) which is provided with connections for spraying points (4) and in which the pressure level required for paint-spraying is set by means of a pressure vessel (3) and with a pressurising gas above the liquid level, characterized in that a circulation pump (2) is arranged in the ring main (1), the pressure vessel (3) forms the starting point and the end point of the ring main (1) and a pump (6) is provided which delivers paint to the pressure vessel (3).
EP80103148A 1979-06-13 1980-06-06 Method and apparatus for supplying paint to painting installations Expired EP0021182B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80103148T ATE2167T1 (en) 1979-06-13 1980-06-06 METHOD AND DEVICE FOR PAINT SUPPLY OF PAINT LINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2923906 1979-06-13
DE2923906A DE2923906C2 (en) 1979-06-13 1979-06-13 Method and device for supplying paint to painting lines

Publications (3)

Publication Number Publication Date
EP0021182A1 EP0021182A1 (en) 1981-01-07
EP0021182B1 EP0021182B1 (en) 1983-01-05
EP0021182B2 true EP0021182B2 (en) 1987-04-15

Family

ID=6073135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80103148A Expired EP0021182B2 (en) 1979-06-13 1980-06-06 Method and apparatus for supplying paint to painting installations

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US (1) US4390126A (en)
EP (1) EP0021182B2 (en)
JP (1) JPS565157A (en)
AT (1) ATE2167T1 (en)
BR (1) BR8003665A (en)
DE (2) DE2923906C2 (en)
ES (1) ES8200573A1 (en)

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Also Published As

Publication number Publication date
DE2923906B1 (en) 1980-05-08
JPS565157A (en) 1981-01-20
ES492436A0 (en) 1981-11-01
BR8003665A (en) 1981-01-13
US4390126A (en) 1983-06-28
JPS6333915B2 (en) 1988-07-07
ATE2167T1 (en) 1983-01-15
EP0021182A1 (en) 1981-01-07
DE3061538D1 (en) 1983-02-10
ES8200573A1 (en) 1981-11-01
EP0021182B1 (en) 1983-01-05
DE2923906C2 (en) 1981-01-08

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