EP0865830B1 - Colour changer with reversible direction of paint flow - Google Patents

Colour changer with reversible direction of paint flow Download PDF

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Publication number
EP0865830B1
EP0865830B1 EP98104412A EP98104412A EP0865830B1 EP 0865830 B1 EP0865830 B1 EP 0865830B1 EP 98104412 A EP98104412 A EP 98104412A EP 98104412 A EP98104412 A EP 98104412A EP 0865830 B1 EP0865830 B1 EP 0865830B1
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EP
European Patent Office
Prior art keywords
paint
coloured
feed line
arrangement according
displacement body
Prior art date
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EP98104412A
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German (de)
French (fr)
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EP0865830B2 (en
EP0865830A2 (en
EP0865830A3 (en
Inventor
Stefan Esslinger
Herbert Martin
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Duerr Systems AG
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Duerr Systems AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/053—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction
    • B08B9/055—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes moved along the pipes by a fluid, e.g. by fluid pressure or by suction the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/149—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet characterised by colour change manifolds or valves therefor

Definitions

  • the invention relates to a device for painting Objects with different colors, in circular shape Guided color lines, each associated with a color are available, with a spray gun, one Paint supply line, which is a Lackierstoff für between the circular color guide and the Produces spray gun or its nozzle, and optionally one between the circular color guides and the FarbzuWORK founded color changer, through the one color line each with the ink supply line is connectable, wherein a displacement body for cleaning the Ink supply line in Lackierlactic puzzle the Ink supply line is movable.
  • a painting device with the features of the preamble of claim 1 is known from US Patent 5,221,047 known.
  • the displacer is used for expressing the color in the paint supply line in Lackierflußcardi moved to the spray gun side end, there by means a discharge device from the paint supply line taken and a separate line to a Entrance mechanism returned. At this time too Bridging is a plurality of displacers intended. A return from in the paint supply line color is not back to the paint line intended. But that is taken for granted, from JP 07 171 451 A known.
  • the present invention is based on the previously known painting the task, the Color return from the stubby-like Ink supply line with displacers back to a respective circular color guide still more effective.
  • the Color feedback by introducing a flowable medium, which is preferably a gas, such as compressed air, or it can also be a liquid solvent, to support.
  • the liquid medium acts like a Stamp printing on the paint in the feed line and ensures thirty to fifty percent more effective return of color. It became namely found that alone from the known Color return device in the form of a gear pump on the Paint supply line exerted suction pressure with the distance from the pump decreases sharply and that on the walls of the Lead to adhere to paint that is not recycled, but in a subsequent flushing together with the flushing medium is discarded. By doing so when returning of paint, the pressurized medium in Return direction is initiated in the ink supply, could have color recovery rates of eighty percent and be reached about it.
  • the feeder a valve includes, which on its color side dead space free to the Ink supply line connects.
  • the flexible, yielding deformable displacement provided by the over the feeding device inflowing medium in the Ink supply in the return direction and movable during then rinse the ink feed line back in Direction of the spray gun is moved back.
  • the Recovery rate can be increased to 95% and more since by moving the compliant displacer in Return direction, the line inside wall quasi wiped becomes.
  • the diameter of the displacer corresponds in the undeformed state essentially the Conductor inner diameter or is slightly larger than this.
  • the Displacer in a rest position, preferably in one Mold recess in the paint feed line in the area of Dead space-free valve connection of the supply line.
  • the valve of the feed device for the flowable medium is opened, the displacer from the Mold recess under the effect of under pressure standing streamable medium in the light Cross-sectional area of the ink supply line pressed and in Return direction moves.
  • a Stop device provided for the displacer, which a kind of stop or limitation for the displacement body forms.
  • the stop device is in a particularly simple and easy therefore advantageously preferably one Cross-sectional constriction formed in the paint supply.
  • a sensor for Recognition of the displacer provided in Area of the stop device, in particular in Return direction before the stop device. This sensor interacts with a control of the paint shop. If the sensor detects that the displacement body in his End position in the area of the stop device has arrived, so the return process is completed and a rinsing of the Ink supply line can be initiated.
  • the displacement body comprises an inductive detectable signal body, e.g. a metallic, in particular spherical core.
  • FIG. 1 shows a schematic representation of a device for painting objects with different colors.
  • the colors are over circular color lines 2, by a merely indicated ink supply room 4 go out and return to this, to the Lackier worn introduced.
  • the painting facility includes a color changer 6 associated with each of Color cables 2 is selectively connectable. From the color changer 6 starting a Farbzumoltechnisch 8 is provided, which a Lackierstoff für between the color changer. 6 and a spray gun 10 and a nozzle 12 of the Spray gun 10 produces. Furthermore are different Compressed air supply provided, with a Compressed air line 14 opens into the color changer 6 and a further compressed air line 16 leads to the spray gun 10 and the so-called spray air for atomizing or dusting the In the spraying mode, add ink to the spray gun 10.
  • a compressed air line 18 extends as Part of a feeder 20 for under pressure standing flowable medium (compressed air) to the Farbzuthetechnisch 8 and opens via a valve 21 in the Ink supply line 8.
  • one of the shut-off valves is between a respective color line 2 and the color changer. 6 open, so that in the circular guided Color line prevailing pressure over the color changer 6 spreads in the supply line 8. Because this pressure to Operating the spray gun is sufficient, does not need another pump to be used and one in the Farbzu900 effet für provided gear pump 22 is over bypassed a bypass line 24.
  • the gear pump 22 in Lackier Wegtechnisch below a pneumatically controllable color pressure regulator 26 provided by an electrically operated 3/2-way valve or proportional valve 28 is driven and to keep constant a predefinable, to each related color of coordinated pressure is used.
  • the Color pressure regulator 26 is further configured to be in two flow directions can be flowed through.
  • the gun holder 30 includes a Limit switch 32, which is connected to a not shown Control signal "gun in holder" reports. In This position is the spray gun 10 in the area of action a trigger device cooperating with the controller 34.
  • the controller receives the gun in holder signal receives, so the bypass line 24 at the gear pump 22 closed, and the gear pump 22 is called Color return device 36 is driven so that it Direction to the color changer 6 promotes. Now about one Directional control valve 38 in the compressed air line 18 compressed air on a Valve 21 given.
  • the valve 21 is a Diaphragm valve, which in case of pressure on the Compressed air line 18 opens against the force of a spring, so that a pressure medium connection to the ink supply 8 will be produced.
  • a from the figure 2 apparent, yielding deformable displacement body 40 acted upon by the compressed air and in the paint supply line 8 in the return direction, i. towards the Color changer 6 moves.
  • the displacement body 40 acts in a way as a stamp and presses in the Farbzu réelletechnisch 8 standing color column to the suction side of Gear pump 22.
  • the gear pump 22 then promotes the color opposite to in the circular color lines. 2 Pending pressure in the respective color line 2 back. In this case, the displacement body 40 slides against the inside the FarbzuDOM effet 8 and cleans it out, so to speak.
  • the displacer 40 finally strikes against a Stop device 42 in the form of a constriction 44 in the Ink supply 8 on.
  • a sensor 46 for detecting the displacer 40 intended.
  • the sensor 46 works inductively and reports when it is passed by the displacer body 40, a corresponding signal to the controller. Thereupon becomes the return process ended. Almost the entire color, the between the valve 21 and the color pressure regulator 26 and the stop device 42 for the displacement body 40th was returned to recycling. It will now by alternately opening a valve in one more not mentioned solvent line 48 and in the beginning mentioned compressed air line 14 initiated a flushing process.
  • FIG. 2 shows the spray gun 10, wherein the Feed device 20 cut for the compressed air is shown.
  • the compressed air line 18 opens into a Transverse hole 50, which in a metallic block 52 is formed and with a pressure chamber 54 of the valve 20th connected is.
  • the directional control valve shown in Figure 1 38 is opened, so compressed air is below about 6 to 8 bar in the pressure chamber 54.
  • This will be a circumferential clamped diaphragm 56 against a spring preload 58 deflected.
  • one with the membrane 56th connected valve needle 60 lifted off its sealing seat 62, such that a flow connection between the pressure chamber 54 and the ink supply pipe 8 is manufactured.
  • the seal seat 62 defines an opening that is free of dead space in one Mold recess 64 of the ink supply 8 opens. These Mold recess 64 also forms a rest position for the Displacer 40. So if - as just described - the valve needle 60 is lifted from the sealing seat 62, so will the displacer 40 from the mold recess 64 out in presses the ink supply 8 and wanders up to the stopper 42, wherein the displacer 40, the in the paint supply 8 located color column for Suction side of the Zahradpumpe 22 pushes in front of him.

Description

Die Erfindung betrifft eine Einrichtung zum Lackieren von Gegenständen mit verschiedenen Farben, die in kreisförmig geführten Farbleitungen, welche je einer Farbe zugeordnet sind, zur Verfügung stehen, mit einer Spritzpistole, einer Farbzuführleitung, die eine Lackiermittelverbindung zwischen der kreisförmig geführten Farbleitung und der Spritzpistole bzw. deren Düse herstellt, und gegebenenfalls einem zwischen den kreisförmig geführten Farbleitungen und der Farbzuführleitung vorgesehenen Farbwechsler, durch den jeweils eine Farbleitung mit der Farbzuführleitung verbindbar ist, wobei ein Verdrängerkörper zum Reinigen der Farbzuführleitung in Lackierflussrichtung der Farbzuführleitung bewegbar ist. The invention relates to a device for painting Objects with different colors, in circular shape Guided color lines, each associated with a color are available, with a spray gun, one Paint supply line, which is a Lackiermittelverbindung between the circular color guide and the Produces spray gun or its nozzle, and optionally one between the circular color guides and the Farbzuführleitung provided color changer, through the one color line each with the ink supply line is connectable, wherein a displacement body for cleaning the Ink supply line in Lackierflussrichtung the Ink supply line is movable.

Beim Betreiben von Lackiereinrichtungen besteht seit jeher das Problem, dass einerseits verschiedene Farben zum Einsatz kommen, so dass entweder voneinander getrennte Systeme benutzt werden müssen, was jedoch aufwendig ist und daher üblicherweise nicht praktiziert wird, oder es müssen die Komponenten bei einem Farbwechsel gereinigt werden. Wenn eine Spritzpistole im letzteren Fall zum Spritzen mehrerer Farben verwendet wird, so muss das gerade in der Farbzuführleitung befindliche Farbvolumen entweder verworfen werden oder wie bei der aus der DE 44 23 643 A1 bekannten Lackiereinrichtung wenigstens teilweise in die Farbleitung zurückgeführt werden. Hierfür wird die Farbrückführeinrichtung in Form einer Pumpe verwendet. Das gleiche Problem tritt auf, wenn zwar kein Farbwechsel durchgeführt werden soll, die Lackiereinrichtung oder eine zu einer bestimmten Farbart gehörende Spritzpistole und Farbzuführleitung längere Zeit (bereits 4 - 5 Stunden) nicht benutzt wurden, da hierdurch in der Farbzuführleitung bzw. in der Spritzpistole eine Entmischung bzw. Sedimentation der Farbe stattfindet, so dass dieses Farbvolumen für den Lackiervorgang unbrauchbar ist. In den kreisförmig geführten Farbleitungen finden zwar während eines Stillstands der Anlage ebenfalls Sedimentations- bzw. Entmischungsvorgänge der Farbe statt; die Farbe wird jedoch durch das Zirkulieren beim Betrieb der Lackiereinrichtung wieder homogenisiert. Eine derartige Homogenisierung ist jedoch in der stichleitungsartigen Farbzuführleitung zur Spritzpistole nicht möglich.In the operation of painting facilities has always been the problem that on the one hand different colors for Use, so either separate from each other Systems must be used, but this is expensive and therefore usually not practiced, or it must the components are cleaned during a color change. If a spray gun in the latter case for spraying is used in several colors, so that just in the Farbzuführleitung located color volume either be discarded or as in the DE 44 23 643 A1 known painting at least partially in the Color line are returned. For this purpose, the Color return device used in the form of a pump. The same problem occurs, though no color change to be performed, the painting or a to a particular type of color belonging spray gun and Ink supply line for a longer time (already 4 - 5 hours) were not used, as this in the paint supply or in the spray gun segregation or Sedimentation of the color takes place, so this Color volume for the painting process is unusable. In the Although circular guided color lines can find while a shutdown of the plant also sedimentation or Degrading processes of color take place; the color is, however by circulating during operation of the painting device homogenized again. Such homogenization is However, in the stub-like Farbzuführleitung to Spray gun not possible.

Eine Lackiereinrichtung mit den Merkmalen des Oberbegriffs des Anspruchs 1 ist aus der US-Patentschrift 5,221,047 bekannt geworden. Der Verdrängerkörper wird zum Ausdrücken der Farbe in der Farbzuführleitung in Lackierflußrichtung zu deren spritzpistolenseitigem Ende bewegt, dort mittels einer Ausschleußeinrichtung aus der Farbzuführleitung entnommen und über eine separate Leitung zu einer Einschleußeinrichtung zurückgeführt. Um diese Zeit zu überbrücken, ist eine Mehrzahl von Verdrängerkörpern vorgesehen. Eine Rückführung von in der Farbzuführleitung befindlicher Farbe zurück in die Farbleitung ist nicht vorgesehen. Dies ist aber für sich genommen, aus der JP 07 171 451 A bekannt.A painting device with the features of the preamble of claim 1 is known from US Patent 5,221,047 known. The displacer is used for expressing the color in the paint supply line in Lackierflußrichtung moved to the spray gun side end, there by means a discharge device from the paint supply line taken and a separate line to a Entrance mechanism returned. At this time too Bridging is a plurality of displacers intended. A return from in the paint supply line color is not back to the paint line intended. But that is taken for granted, from JP 07 171 451 A known.

Aus der DE 42 23 054 A1 ist es bereits bekannt, Pulverleitungen mittels Druckluft und mindestens eines elastisch komprimierbaren Reinigungskörpers, der durch die Pulverleitungen hindurchgetrieben wird, zu reinigen. From DE 42 23 054 A1 it is already known Powder lines by means of compressed air and at least one elastically compressible cleaning body, by the Powder lines is driven through, to clean.

Der vorliegenden Erfindung liegt ausgehend von der vorbekannten Lackiereinrichtungen die Aufgabe zugrunde, die Farbrückführung von der stichleitungsartigen Farbzuführleitung mit Verdrängerkörpern zurück zu einer jeweiligen kreisförmig geführten Farbleitung noch effektiver zu gestalten.The present invention is based on the previously known painting the task, the Color return from the stubby-like Ink supply line with displacers back to a respective circular color guide still more effective.

Diese Aufgabe wird durch eine Lackiereinrichtung mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by a painting device with the features of claim 1.

Es wird also erfindungsgemäß vorgeschlagen, die Farbrückführung durch Einleitung eines strömbaren Mediums, bei dem es sich vorzugsweise um ein Gas, wie Druckluft, oder aber auch um ein flüssiges Lösungsmittel handeln kann, zu unterstützen. Das flüssige Medium wirkt dabei wie ein Stempeldruck auf die in der Zuführleitung stehende Farbe und gewährleistet eine dreißig bis fünfzig Prozent effektivere Rückführung der Farbe. Es wurde nämlich festgestellt, dass der allein von der bekannten Farbrückführeinrichtung in Form einer Zahnradpumpe auf die Farbzuführleitung ausgeübte Ansaugdruck mit der Entfernung von der Pumpe stark abnimmt und dass an den Wandungen der Leitung Farbe haften bleibt, die nicht zurückgeführt wird, sondern bei einem anschließenden Spülvorgang zusammen mit dem Spülmedium verworfen wird. Dadurch dass beim Rückführen von Farbe das unter Überdruck stehende strömbare Medium in Rückführrichtung in die Farbzuführleitung eingeleitet wird, konnten Farbrückgewinnungsraten von achtzig Prozent und darüber erreicht werden.It is therefore proposed according to the invention, the Color feedback by introducing a flowable medium, which is preferably a gas, such as compressed air, or it can also be a liquid solvent, to support. The liquid medium acts like a Stamp printing on the paint in the feed line and ensures thirty to fifty percent more effective return of color. It became namely found that alone from the known Color return device in the form of a gear pump on the Paint supply line exerted suction pressure with the distance from the pump decreases sharply and that on the walls of the Lead to adhere to paint that is not recycled, but in a subsequent flushing together with the flushing medium is discarded. By doing so when returning of paint, the pressurized medium in Return direction is initiated in the ink supply, could have color recovery rates of eighty percent and be reached about it.

Da die Zuführeinrichtung für das strömbare Medium eine T-Verbindung mit der Farbzuführung bildet, ergibt sich wiederum eine an sich unerwünschte Stichleitung. Es wird daher vorgeschlagen, dass die Zuführeinrichtung ein Ventil umfasst, welches auf seiner Farbseite totraumfrei an die Farbzuführleitung anschließt.As the supply for the flowable medium a T-connection forms with the ink supply, results again an undesirable stub line. It will therefore suggested that the feeder a valve includes, which on its color side dead space free to the Ink supply line connects.

Zum weiteren Unterstützen der Farbrückführung in der jeweiligen Farbzuführleitung ist der flexible, nachgiebig verformbare Verdrängerkörper vorgesehen, der von dem über die Zuführeinrichtung einströmenden Medium in der Farbzuführleitung in Rückführrichtung bewegbar und beim anschließenden Spülen der Farbzuführleitung wieder in Richtung zur Spritzpistole zurückbewegbar ist. Durch diese weitere erfindungsgemäße Maßnahme kann die Rückgewinnungsrate auf 95 % und mehr gesteigert werden, da durch das Bewegen des nachgiebigen Verdrängerkörpers in Rückführrichtung die Leitungsinnenwandung quasi abgewischt wird. Der Durchmesser des Verdrängerkörpers entspricht im unverformten Zustand im Wesentlichen dem Leitungsinnendurchmesser oder ist etwas größer als dieser. Beim Zurückbewegen des Verdrängerkörpers in Richtung zur Spritzpistole wird dieser Wischvorgang nochmals wiederholt.To further assist the color feedback in the respective ink supply line is the flexible, yielding deformable displacement provided by the over the feeding device inflowing medium in the Ink supply in the return direction and movable during then rinse the ink feed line back in Direction of the spray gun is moved back. Through this Another measure according to the invention, the Recovery rate can be increased to 95% and more since by moving the compliant displacer in Return direction, the line inside wall quasi wiped becomes. The diameter of the displacer corresponds in the undeformed state essentially the Conductor inner diameter or is slightly larger than this. When moving back the displacer in the direction of Spray gun, this wiping process is repeated again.

Während eines Lackiervorgangs befindet sich der Verdrängerkörper in einer Ruhelage, vorzugsweise in einer Formausnehmung in der Farbzuführleitung im Bereich des totraumfreien Ventilanschlusses der Zuführleitung. Sobald das Ventil der Zuführeinrichtung für das strömbare Medium geöffnet wird, wird der Verdrängerkörper aus der Formausnehmung unter der Wirkung des unter Überdruck stehenden strömbaren Mediums in die lichte Querschnittsfläche der Farbzuführleitung gedrückt und in Rückführrichtung bewegt.During a painting process is the Displacer in a rest position, preferably in one Mold recess in the paint feed line in the area of Dead space-free valve connection of the supply line. As soon as the valve of the feed device for the flowable medium is opened, the displacer from the Mold recess under the effect of under pressure standing streamable medium in the light Cross-sectional area of the ink supply line pressed and in Return direction moves.

Nach einer bevorzugten Ausführungsform ist in Farbrückführrichtung vor der Farbrückführeinrichtung eine Stopeinrichtung für den Verdrängerkörper vorgesehen, welche eine Art Anschlag bzw. Begrenzung für den Verdrängerkörper bildet. Die Stopeinrichtung ist in besonders einfacher und daher vorteilhafter Weise vorzugsweise von einer Querschnittsverengung in der Farbzuführleitung gebildet.According to a preferred embodiment is in Color return direction before the color return device a Stop device provided for the displacer, which a kind of stop or limitation for the displacement body forms. The stop device is in a particularly simple and easy therefore advantageously preferably one Cross-sectional constriction formed in the paint supply.

Nach einem weiteren bevorzugten Erfindungsgedanken ist im Bereich der Stopeinrichtung, insbesondere in Rückführrichtung vor der Stopeinrichtung ein Sensor zum Erkennen des Verdrängerkörpers vorgesehen. Dieser Sensor wirkt mit einer Steuerung der Lackieranlage zusammen. Wenn der Sensor erkennt, dass der Verdrängerkörper in seiner Endlage im Bereich der Stopeinrichtung angelangt ist, so ist der Rückführvorgang beendet und ein Spülvorgang der Farbzuführleitung kann eingeleitet werden.According to another preferred inventive concept is in Area of the stop device, in particular in Return direction before the stop device, a sensor for Recognition of the displacer provided. This sensor interacts with a control of the paint shop. If the sensor detects that the displacement body in his End position in the area of the stop device has arrived, so the return process is completed and a rinsing of the Ink supply line can be initiated.

Das Erkennen des Verdrängerkörpers ist vorzugsweise berührungslos durchführbar, was durch einen induktiv oder kapazitiv arbeitenden Sensor erreicht werden kann. Im ersten Fall umfasst der Verdrängerkörper einen induktiv detektierbaren Signalkörper, wie z.B. einen metallischen, insbesondere kugelförmigen Kern.Recognition of the displacer is preferred Non-contact feasible, what by an inductive or Capacitive working sensor can be achieved. in the In the first case, the displacement body comprises an inductive detectable signal body, e.g. a metallic, in particular spherical core.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus den beigefügten Ansprüchen und der zeichnerischen Darstellung und nachfolgenden Beschreibung einer bevorzugten Ausführungsform der erfindungsgemäßen Lackiereinrichtung. In der Zeichnung zeigt:

Figur 1
eine schematische Darstellung einer erfindungsgemäßen Lackiereinrichtung mit einem Farbversorgungsraum kommunizierenden Farbleitungen;
Figur 2
eine teilweise im Schnitt dargestellte Spritzpistole der erfindungsgemäßen Lackiereinrichtung.
Further features, details and advantages of the invention will become apparent from the appended claims and the drawings and the following description of a preferred embodiment of the painting device according to the invention. In the drawing shows:
FIG. 1
a schematic representation of a coating device according to the invention with a Farbversorgungsraum communicating color lines;
FIG. 2
a partially shown in section spray gun of the painting device according to the invention.

Figur 1 zeigt in schematischer Darstellung eine Einrichtung zum Lackieren von Gegenständen mit verschiedenen Farben. Die Farben werden über kreisförmig geführte Farbleitungen 2, die von einem lediglich angedeuteten Farbversorgungsraum 4 ausgehen und wieder zu diesem zurückführen, zu der Lackiereinrichtung herangeführt. Die Lackiereinrichtung umfasst einen Farbwechsler 6, der mit jeder der Farbleitungen 2 wahlweise verbindbar ist. Vom Farbwechsler 6 ausgehend ist eine Farbzuführleitung 8 vorgesehen, welche eine Lackiermittelverbindung zwischen dem Farbwechsler 6 und einer Sprühpistole 10 bzw. einer Düse 12 der Sprühpistole 10 herstellt. Desweiteren sind verschiedene Druckluftzuführungen vorgesehen, wobei eine Druckluftleitung 14 in den Farbwechsler 6 mündet und eine weitere Druckluftleitung 16 zur Spritzpistole 10 führt und die sogenannte Spritzluft zum Verdüsen oder Verstäuben der Farbe im Sprühbetrieb der Spritzpistole 10 zuführt. FIG. 1 shows a schematic representation of a device for painting objects with different colors. The colors are over circular color lines 2, by a merely indicated ink supply room 4 go out and return to this, to the Lackiereinrichtung introduced. The painting facility includes a color changer 6 associated with each of Color cables 2 is selectively connectable. From the color changer 6 starting a Farbzuführleitung 8 is provided, which a Lackiermittelverbindung between the color changer. 6 and a spray gun 10 and a nozzle 12 of the Spray gun 10 produces. Furthermore are different Compressed air supply provided, with a Compressed air line 14 opens into the color changer 6 and a further compressed air line 16 leads to the spray gun 10 and the so-called spray air for atomizing or dusting the In the spraying mode, add ink to the spray gun 10.

Desweiteren erstreckt sich eine Druckluftleitung 18 als Teil einer Zuführeinrichtung 20 für ein unter Überdruck stehendes strömbares Medium (Druckluft) zu der Farbzuführleitung 8 und mündet über ein Ventil 21 in der Farbzuführleitung 8.Furthermore, a compressed air line 18 extends as Part of a feeder 20 for under pressure standing flowable medium (compressed air) to the Farbzuführleitung 8 and opens via a valve 21 in the Ink supply line 8.

Im Lackierbetrieb ist eines der Absperrventile zwischen einer jeweiligen Farbleitung 2 und dem Farbwechsler 6 geöffnet, so dass der in der kreisförmig geführten Farbleitung herrschende Druck sich über den Farbwechsler 6 in die Zuführleitung 8 ausbreitet. Da dieser Druck zum Betreiben der Spritzpistole hinreichend ist, braucht keine weitere Pumpe eingesetzt zu werden und eine in der Farbzuführleitung vorgesehene Zahnradpumpe 22 wird über eine Bypassleitung 24 umgangen. In der Farbzuführleitung 8 ist der Zahnradpumpe 22 in Lackierflussrichtung nachfolgend ein pneumatisch ansteuerbarer Farbdruckregler 26 vorgesehen, der über ein elektrisch betätigtes 3/2-Wegeventil oder Proportionalventil 28 angesteuert wird und zum Konstanthalten eines vorgebbaren, auf die jeweils verwandte Farbe abgestimmten Drucks dient. Der Farbdruckregler 26 ist ferner so ausgebildet, dass er in zwei Durchflussrichtungen durchströmbar ist.In the paint shop, one of the shut-off valves is between a respective color line 2 and the color changer. 6 open, so that in the circular guided Color line prevailing pressure over the color changer 6 spreads in the supply line 8. Because this pressure to Operating the spray gun is sufficient, does not need another pump to be used and one in the Farbzuführleitung provided gear pump 22 is over bypassed a bypass line 24. In the ink supply 8 is the gear pump 22 in Lackierflussrichtung below a pneumatically controllable color pressure regulator 26 provided by an electrically operated 3/2-way valve or proportional valve 28 is driven and to keep constant a predefinable, to each related color of coordinated pressure is used. Of the Color pressure regulator 26 is further configured to be in two flow directions can be flowed through.

Im Lackierbetrieb wird also Farbe unter einem vorgebbaren Zuführdruck über die Zuführleitung 8 zur Spritzpistole 10 gefördert und dort mittels über die Druckluftleitung 16 herangeführter Pressluft durch die Düse 12 zerstäubt.In Lackierbetrieb so color is below a predetermined Feed pressure via the supply line 8 to the spray gun 10th promoted and there by means of the compressed air line 16 supplied compressed air atomized through the nozzle 12.

Wenn ein Farbwechsel durchgeführt werden soll oder der Lackiervorgang längere Zeit unterbrochen werden soll, wird die Spritzpistole 10 in eine Pistolenhalterung 30 eingehängt. Die Pistolenhalterung 30 umfasst einen Endschalter 32, welcher an eine nicht dargestellte Steuerung das Signal "Pistole in Halterung" meldet. In dieser Position ist die Spritzpistole 10 im Wirkungsbereich einer mit der Steuerung zusammenwirkenden Abzugsvorrichtung 34. Wenn die Steuerung das Signal "Pistole in Halterung" erhält, so wird die Bypassleitung 24 bei der Zahnradpumpe 22 geschlossen, und die Zahnradpumpe 22 wird als Farbrückführeinrichtung 36 so angetrieben, dass sie in Richtung auf den Farbwechsler 6 fördert. Nun wird über ein Wegeventil 38 in der Druckluftleitung 18 Druckluft auf ein Ventil 21 gegeben. Bei dem Ventil 21 handelt es sich um ein Membranventil, das bei Anliegen eines Drucks über die Druckluftleitung 18 entgegen der Kraft einer Feder öffnet, so dass eine Druckmittelverbindung zur Farbzuführleitung 8 hergestellt wird. Hierbei wird ein aus der Figur 2 ersichtlicher, nachgiebig verformbarer Verdrängerkörper 40 von der Druckluft beaufschlagt und in der Farbzuführleitung 8 in Rückführrichtung, d.h. in Richtung auf den Farbwechsler 6 bewegt. Der Verdrängerkörper 40 wirkt dabei gewissermaßen als Stempel und drückt die in der Farbzuführleitung 8 stehende Farbsäule zur Ansaugseite der Zahnradpumpe 22. Die Zahnradpumpe 22 fördert die Farbe dann entgegen dem in den kreisförmigen Farbleitungen 2 anstehenden Druck in die jeweilige Farbleitung 2 zurück. Dabei gleitet der Verdrängerkörper 40 gegen die Innenseite der Farbzuführleitung 8 und putzt diese gewissermaßen aus. Der Verdrängerkörper 40 schlägt schließlich gegen eine Stopeinrichtung 42 in Form einer Verengung 44 in der Farbzuführleitung 8 an. Unmittelbar vor der Verengung 44 ist ein Sensor 46 zum Erkennen des Verdrängerkörpers 40 vorgesehen. Der Sensor 46 arbeitet induktiv und meldet, wenn er vom Verdrángerkörper 40 passiert wird, ein dementsprechendes Signal an die Steuerung. Daraufhin wird der Rückführvorgang beendet. Nahezu die gesamte Farbe, die sich zwischen dem Ventil 21 und dem Farbdruckregler 26 bzw. der Stopeinrichtung 42 für den Verdrängerkörper 40 befindet, wurde zur Wiederverwertung zurückgeführt. Es wird nun durch abwechselndes Öffnen eines Ventils in einer noch nicht erwähnten Lösungsmittelleitung 48 und in der eingangs erwähnten Druckluftleitung 14 ein Spülvorgang eingeleitet. Das Gemisch aus Druckluft und Lösungsmittel wird in den Farbwechsler 6 eingeleitet und passiert in Lackierflussrichtung die Zahnradpumpe 22 über die Bypassleitung 24 und gelangt über den Farbdruckregler 26 zu der Stopeinrichtung 42 und beaufschlagt und befördert den Verdrängerkörper 40 wieder zurück in Richtung auf die Spritzpistole 10. Beim Einleiten dieses Spülvorgangs wird über die zuvor erwähnte Abzugsvorrichtung 34 der Abzug der Spritzpistole 10 betätigt, so dass das Lösungsmittel/Luftgemisch über die Düse 12 in die Pistolenhalterung 30 gelangen und von dort einer gesonderten Entsorgung zugeführt werden kann. Nachdem der Verdrängerkörper 40 wieder die in Figur 2 dargestellte Lage eingenommen hat, ist der Spülvorgang beendet und es kann durch Öffnen eines anderen Absperrventils eine andere Farbleitung 2 mit dem Farbwechsler 6 bzw. der Farbzuführleitung 8 verbunden werden.If a color change is to be performed or the Painting process is to be interrupted for a long time is the spray gun 10 in a gun holder 30th hooked. The gun holder 30 includes a Limit switch 32, which is connected to a not shown Control signal "gun in holder" reports. In This position is the spray gun 10 in the area of action a trigger device cooperating with the controller 34. When the controller receives the gun in holder signal receives, so the bypass line 24 at the gear pump 22 closed, and the gear pump 22 is called Color return device 36 is driven so that it Direction to the color changer 6 promotes. Now about one Directional control valve 38 in the compressed air line 18 compressed air on a Valve 21 given. The valve 21 is a Diaphragm valve, which in case of pressure on the Compressed air line 18 opens against the force of a spring, so that a pressure medium connection to the ink supply 8 will be produced. Here, a from the figure 2 apparent, yielding deformable displacement body 40 acted upon by the compressed air and in the paint supply line 8 in the return direction, i. towards the Color changer 6 moves. The displacement body 40 acts in a way as a stamp and presses in the Farbzuführleitung 8 standing color column to the suction side of Gear pump 22. The gear pump 22 then promotes the color opposite to in the circular color lines. 2 Pending pressure in the respective color line 2 back. In this case, the displacement body 40 slides against the inside the Farbzuführleitung 8 and cleans it out, so to speak. The displacer 40 finally strikes against a Stop device 42 in the form of a constriction 44 in the Ink supply 8 on. Immediately before the constriction 44 is a sensor 46 for detecting the displacer 40 intended. The sensor 46 works inductively and reports when it is passed by the displacer body 40, a corresponding signal to the controller. Thereupon becomes the return process ended. Almost the entire color, the between the valve 21 and the color pressure regulator 26 and the stop device 42 for the displacement body 40th was returned to recycling. It will now by alternately opening a valve in one more not mentioned solvent line 48 and in the beginning mentioned compressed air line 14 initiated a flushing process. The mixture of compressed air and solvent is in the Color changer 6 initiated and happens in Lackierflussrichtung the gear pump 22 via the Bypass line 24 and passes through the color pressure regulator 26 the stopper 42 and acts on and conveys the Displacer 40 back towards the Spray gun 10. When initiating this flushing is via the aforementioned extraction device 34, the deduction of Spray gun 10 is actuated so that the Solvent / air mixture through the nozzle 12 in the Pistol holder 30 arrive and from there one can be supplied to separate disposal. After the Displacer 40 again the position shown in Figure 2 has taken, the flushing is completed and it can by opening another shut-off valve another Color line 2 with the color changer 6 or the Farbzuführleitung 8 are connected.

Figur 2 zeigt die Spritzpistole 10, wobei die Zuführeinrichtung 20 für die Druckluft geschnitten dargestellt ist. Die Druckluftleitung 18 mündet in eine Querbohrung 50, die in einem metallischen Block 52 ausgebildet ist und mit einem Druckraum 54 des Ventils 20 verbunden ist. Wenn das in Figur 1 dargestellte Wegeventil 38 geöffnet wird, so steht Druckluft unter ca. 6 bis 8 bar im Druckraum 54 an. Hierdurch wird eine umfangsseitig eingespannte Membran 56 entgegen einer Federvorspannung 58 ausgelenkt. Hierdurch wird eine mit der Membran 56 verbundene Ventilnadel 60 von ihrem Dichtsitz 62 abgehoben, so dass eine Strömungsverbindung zwischen dem Druckraum 54 und der Farbzuführleitung 8 hergestellt wird. Der Dichtsitz 62 begrenzt eine Öffnung, die totraumfrei in einer Formausnehmung 64 der Farbzuführleitung 8 mündet. Diese Formausnehmung 64 bildet zugleich eine Ruheposition für den Verdrängerkörper 40. Wenn also - wie soeben beschrieben - die Ventilnadel 60 vom Dichtsitz 62 abgehoben wird, so wird der Verdrängerkörper 40 aus der Formausnehmung 64 heraus in die Farbzuführleitung 8 gedrückt und wandert darin bis zu der Stopeinrichtung 42, wobei der Verdrängerkörper 40 die in der Farbzuführleitung 8 befindliche Farbsäule zur Ansaugseite der Zahradpumpe 22 vor sich herschiebt.Figure 2 shows the spray gun 10, wherein the Feed device 20 cut for the compressed air is shown. The compressed air line 18 opens into a Transverse hole 50, which in a metallic block 52 is formed and with a pressure chamber 54 of the valve 20th connected is. When the directional control valve shown in Figure 1 38 is opened, so compressed air is below about 6 to 8 bar in the pressure chamber 54. This will be a circumferential clamped diaphragm 56 against a spring preload 58 deflected. As a result, one with the membrane 56th connected valve needle 60 lifted off its sealing seat 62, such that a flow connection between the pressure chamber 54 and the ink supply pipe 8 is manufactured. The seal seat 62 defines an opening that is free of dead space in one Mold recess 64 of the ink supply 8 opens. These Mold recess 64 also forms a rest position for the Displacer 40. So if - as just described - the valve needle 60 is lifted from the sealing seat 62, so will the displacer 40 from the mold recess 64 out in presses the ink supply 8 and wanders up to the stopper 42, wherein the displacer 40, the in the paint supply 8 located color column for Suction side of the Zahradpumpe 22 pushes in front of him.

Beim Spülen der Zuführleitung 8 ist das Wegeventil 38 und damit das Ventil 21 geschlossen. Das Spülgemisch strömt dann an dem wieder in die Formausnehmung 64 gedrückten Verdrängerkörper 40 vorbei und entweicht durch die Düse 12 der Spritzpistole 10 in die Pistolenhalterung 30.When flushing the supply 8, the directional control valve 38 and so that the valve 21 is closed. The rinsing mixture flows then pressed on the again in the mold cavity 64 Displacer 40 over and escapes through the nozzle 12th the spray gun 10 in the gun holder 30th

Claims (9)

  1. Arrangement for painting objects with different coloured paints, which are available in circularly run coloured-paint lines (2), each of which is allocated one colour, comprising a spray gun (10), a coloured-paint feed line (8), which creates a paint-means connection between a circularly run coloured-paint line (2) and the spray gun (10), wherein a displacement body (40) for cleaning the coloured-paint feed line (8) is provided, the displacement body (40) being movable in the paint-flow direction in the coloured-paint feed line, characterized in that, in the region of the spray-gun end of the coloured-paint feed line (8), there is provided a feed means (20) for feeding a medium into the coloured-paint feed line (8), the medium being under pressure and able to flow, and in that the coloured paint present in the coloured-paint feed line (8) can be fed back against the paint flow direction and in that, to assist the feedback of coloured paint in the coloured-paint feed line (8), the said flexible, resiliently deformable displacement body (40) can be moved by the medium in the coloured-paint feed line (8) against the paint-flow direction in the feedback direction, the medium being able to flow in by way of the feed means (20), and can be moved back again, during the subsequent flushing of the coloured-paint feed line (8), toward the spray gun (10) and is received, during painting, in a moulded recess (64) in the coloured-paint feed line (8).
  2. Arrangement according to claim 1, characterized in that the feed means (20) includes a valve (21), which lies adjacent the coloured-paint feed line (8) on the coloured-paint side such to involve substantially no dead space.
  3. Arrangement according to claim 1 or claim 2, characterized in that the displacement body (40) is provided, during painting, in a moulded recess (64) in the coloured-paint feed line (8) in the region of the zero dead-space valve connection of the feed line.
  4. Arrangement according to any one of the preceding claims, characterized in that, in front of the coloured-paint feedback means (22, 36) in the feedback direction, there is provided a stop means (42) for the displacement body (40).
  5. Arrangement according to claim 4, characterized in that the stop means (42) is constituted by a transverse-section constriction (44) in the coloured-paint feed line (8).
  6. Arrangement according to claim 4 or claim 5, characterized in that, in the region of the stop means (42) or in front of the stop means (42) in the feedback direction, there is provided a sensor (46) for detecting the displacement body.
  7. Arrangement according to claim 6, characterized in that the displacement body (40) can be detected in a contactless manner.
  8. Arrangement according to claim 7, characterized in that the sensor (46) works inductively or capacitively.
  9. Arrangement according to any one of the preceding claims, characterized in that the displacement body (40) comprises an inductively detectable signal body.
EP98104412A 1997-03-11 1998-03-11 Colour changer with reversible direction of paint flow Expired - Lifetime EP0865830B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19709988 1997-03-11
DE19709988A DE19709988C2 (en) 1997-03-11 1997-03-11 Painting device with several circular color lines

Publications (4)

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EP0865830A2 EP0865830A2 (en) 1998-09-23
EP0865830A3 EP0865830A3 (en) 2002-01-30
EP0865830B1 true EP0865830B1 (en) 2005-06-08
EP0865830B2 EP0865830B2 (en) 2009-09-16

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DE (2) DE19709988C2 (en)
ES (1) ES2242988T5 (en)

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Also Published As

Publication number Publication date
EP0865830B2 (en) 2009-09-16
DE19709988C2 (en) 2002-01-24
EP0865830A2 (en) 1998-09-23
DE19709988A1 (en) 1998-10-01
DE59812844D1 (en) 2005-07-14
ES2242988T5 (en) 2009-12-14
EP0865830A3 (en) 2002-01-30
ES2242988T3 (en) 2005-11-16

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