EP1314480B1 - Method and device for paint supply in a coating device using a pig - Google Patents

Method and device for paint supply in a coating device using a pig Download PDF

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Publication number
EP1314480B1
EP1314480B1 EP02025207A EP02025207A EP1314480B1 EP 1314480 B1 EP1314480 B1 EP 1314480B1 EP 02025207 A EP02025207 A EP 02025207A EP 02025207 A EP02025207 A EP 02025207A EP 1314480 B1 EP1314480 B1 EP 1314480B1
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EP
European Patent Office
Prior art keywords
paint
pig
passage
inlet passage
valve
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EP02025207A
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German (de)
French (fr)
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EP1314480A1 (en
Inventor
Joachim Hering
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Duerr Systems AG
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Duerr Systems AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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 color Atomizer and a coating device with an atomizer for the serial coating of workpieces with coating material changing color according to the generic term of independent claims.
  • the object of the invention is a method for supplying a color Atomizer or a coating device that still enable lower color losses than before.
  • Fig. 1 shows the paint tube 12 connected to the paint nozzle 10 Speed rotary atomizer.
  • the paint inlet channel leads through the paint tube 12 14 to the as a control valve for switching on and off of the spray serving main needle valve 16 to which the Color output channel 18 of the paint nozzle 10 is connected.
  • a detergent valve KS separate channel 28 for detergent for short rinsing the bell plate in a known manner.
  • the paint inlet channel 14 is piggable and outside according to the invention of the color tube 12 connected to a first pig station 30.
  • the pig station 30 in turn has a valve arrangement 34 with a color valve F and a return valve RF1 connected, for example via a common line 35, however, separate lines could also lead to these valves.
  • the second pig station 32 is shown inside of the paint tube 12 at the end of the paint inlet channel on the control valve side 14, ie immediately at its connection to the Main needle valve 16 arranged. In the second pig station 32 the pig 33 is shown.
  • At both pig stations 30 and 32 can be sensors for monitoring the respective pig end position are with which high control accuracy of pig and pressure processes described below can be reached is.
  • this is at the free end of the needle 22 arranged cylindrical needle head 23 of the main needle valve 16 displaceable in a cylindrical valve bore 25 in the paint tube 12, at the end facing away from the needle with the paint nozzle the atomizer, i.e. connected to the color output channel 18 is, and in the middle of that coming from the paint input channel 14 Cross bore 15 opens.
  • the main needle valve is 16 between the corresponding in the drawing Arrows indicated three valve positions switchable (in Contrary to the previously known and usual atomizers, their Main needle valve as a 2/2-way valve only two switch positions Has).
  • valve position 1 the needle head 23 sits on the nozzle-side end of the valve bore 25, so that the way in the Channel 18 of the paint nozzle 10 is shut off during the Pig station 32 and the transverse bore 15 through the valve bore 25 leading into the needle bore 20 is open.
  • the needle head 23 is shown in the valve position 2, in which he connects the transverse bore 15 to the interior of the valve blocks and consequently the pig station 32 against the Paint nozzle 10 and seals against the needle bore 20.
  • valve position 3 is finally the way blocked between the valve bore 25 and the needle bore 20, while the pig station 32 is connected to the paint nozzle 10.
  • valve position 3 As soon as the pig here a predetermined point along the Pig line reached, for short rinsing the paint nozzle 10 that Valve RF closed and the main needle valve 16 out of the valve position 1 can be switched to valve position 3, see above that the newt moves out the detergent as it moves pushes the channel 14 out of the atomizer through the nozzle 10, for example in the paint booth.
  • the predetermined one Switchover point can be defined in different ways z. B. after a defined time or by Signal one on the appearance of the newt at the predetermined Place appealing pig sensor or by measuring the amount of paint flowing in through the paint valve F.
  • Advantageous is consequently the one used to rinse the nozzle 10
  • the amount of detergent is always constant and reproducible.
  • the newt press process is finished as soon as the newt 33 in its target station 32 arrives.
  • the main needle valve 16 When the pig 33 is pressed from the paint into the target station 32 can by switching the main needle valve 16 the ink nozzle 10 is "pressed" into the valve position 3, i.e. the colored paint past the pig to the nozzle outlet opening be pressed. After that, the main needle valve is in its Position 2 switched so that the system is ready for painting.
  • the pig 33 If the pig 33 is in its position when the color valve F is open Target station 32 is located, under the control of the main needle valve 16 can be painted. At valve position 3 occurs the colored paint through the channel 18 out of the paint nozzle 10. to Interruption of the paint flow becomes the main needle valve 16 in his position 2 switched back.
  • the main needle valve 16 first switched to its position 2 and the color valve F closed. This is then used to pig the channel 14 Main needle valve 16 switched to valve position 1 and a valve for pig push medium opened, for example that Valve MSM in the valve block 26. At the same time, the color valve F the valve assembly 34 opened. From the sliding medium Newt 32 from its position in the target station 32 in which it is in the immediate vicinity of the paint nozzle 10, in his Source station 30 pushed back, being the whole in the paint tube 12 (with the exception of valve bore 25 and the short cross bore 15) located paint to the source station and through pushes it back into the paint supply system. As Sliding medium could also use detergent from valve V. become.
  • the color-guiding Channels are flushed through the detergent that comes out of the valve V into that to the return valve RF1 of the valve arrangement 34 connected return line of the pig station 30 flows.
  • the Main needle valve 16 is in the valve position 1.
  • the paint inlet channel 14 is again flooded with the detergent as before the start of the coating.
  • the valve assembly 34 at the pig swell station can be on any dosing system can be connected upstream, for example by a dosing pump, by piston metering or ink quantity measurement and in particular also by one of the patent applications DE 10033987, DE 10131562 or DE ... (15545) dated 27/11/2001 described
  • a / B pig systems can be formed in each of which the desired predetermined amount of color between conveyed two newts through an insulating line becomes.
  • the one serving as the source station is located Pig station 30 in the immediate vicinity of the dosing system. If the upstream dosing system is a pigging system whose target station is close to the pig station 30.
  • the pig station 30 is located outside the paint tube 12 and usually outside of the atomizer and is with the part of the paint inlet channel 14 located in the paint tube 12 a piggable pipe section forming a continuation of the channel 14 14 'connected. If the containing the color tube 12 Atomizers, for example, manually or in a known manner Automatically interchangeable on the wrist of a painting robot is mounted, this line piece 14 'through a piggable coupling 44 at the interface between the Atomizer and the robot wrist and through the wrist extend into the subsequent robot arm, in which the pig station 30 can be accommodated.
  • the valve arrangements too 26 and 34 are conveniently located outside of Atomizer.
  • the needle bore is used 20 both as a return line for the detergent when pressed the pig as well as a feed line for the pig pushing medium.
  • the pig of the paint inlet channel described here is but not only with the main needle valve 16 of the illustrated Realizable embodiment. It can also be a known one Needle valve switchable between only two valve positions can be used, at the pig station 32 a separate line connected for the required pig push medium is.
  • FIG. 2 An example of this is shown in Fig. 2, in which the Paint nozzle 110 with the ink outlet channel 118, the ink inlet channel 114 with the pig stations 130 and 132 and the piggable Coupling 137 correspond to the exemplary embodiment according to FIG. 1.
  • the main needle valve 116 is, however, that in rotary atomizers usual (cheap) 2/2-way valve, which by its actuator 123 is only switched between two positions in which it is the Away from the pig station 132 via the cross bore 115 in the Paint outlet channel 118 of the paint nozzle opens or blocks.
  • the mode of operation otherwise corresponds to the exemplary embodiment 1.
  • the return valve can RF1 and the color valve F of the valve assembly 134 as shown via separate channels to the pig station 130 be connected.
  • the color input channel of the Paint tube 12 or 112 connected to an A / B paint supply system be as it is in the patent application DE 101 57 966.7 is described, in other words for the metered supply of material two piston dosing containers or others with automatically changeable Outflow rate of empty paint containers alternately each filled with color material that with predetermined Volume in an upstream supply line and is pushed into the container by a newt.
  • the pigging system explained on the basis of the drawing is suitable not only for high-speed rotary atomizers, but also for any other atomizer types.

Landscapes

  • Spray Control Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Road Signs Or Road Markings (AREA)

Abstract

Following a coating step, a pig (33) is used to force out any coating material remaining in the paint inlet channel (14) from the end of the channel next to the control valve (16), in the direction of the opposite end of the channel. <??>The method is used to supply paint to a production line on which nebuliser devices working with different coloured paints are used to spray workpieces. An Independent claim is also included for the coating machine used in this method, comprising an inlet channel (14) for different colour paints, a preferably nozzle-type outlet channel, a control valve between the inlet and outlet channels, a pig station (32) at the valve end of the inlet channel, a pig station (30) at the opposite end of the inlet channel to the valve and a pig which can be moved along the inlet channel.

Description

Die Erfindung betrifft ein Verfahren zur Farbversorgung eines Zerstäubers und eine Beschichtungsvorrichtung mit einem Zerstäuber für die Serienbeschichtung von Werkstücken mit Beschichtungsmaterial wechselnder Farbe gemäß dem Oberbegriff der unabhängigen Patentansprüche.The invention relates to a method for supplying a color Atomizer and a coating device with an atomizer for the serial coating of workpieces with coating material changing color according to the generic term of independent claims.

Eines der wesentlichen Probleme bei der Serienlackierung von Werkstücken wie z. B. Fahrzeugkarossen ist die Reduzierung von Farbverlusten beim Farbwechsel. Zu diesem Zweck ist es bekannt und schon seit einiger Zeit üblich, nach einem Beschichtungsvorgang in einer Farbleitung verbleibende Farbreste mit einem Molch in das vorgeschaltete Farbversorgungssystem zurückzudrücken (DE 19709988, EP 0888825). Wenn die zerstäuberseitige Molchstation hierbei möglichst nahe am Zerstäuber angeordnet wird, sind die nicht gemolchte Reststrecke und die dort entstehenden Farbverluste entsprechend klein. Der die Molchstation bildende Ventilblock wird derzeit in der Praxis mit dem Zerstäuber über einen Schlauch verbunden oder im günstigsten Fall direkt an den Zerstäuber angeflanscht.One of the main problems with the serial painting of Workpieces such as B. Vehicle bodies is the reduction of Color loss when changing colors. It is known for this purpose and has been common for some time after a coating process Color residues remaining in a paint line with a Push the pig back into the upstream paint supply system (DE 19709988, EP 0888825). If the atomizer side The pig station is arranged as close as possible to the atomizer will be the non-pigged remaining distance and the ones created there Color losses are correspondingly small. The pig station forming valve block is currently in practice with the atomizer connected by a hose or in the best case flanged directly to the atomizer.

Relativ geringe Farbverluste ergeben sich auch bei neueren Farbversorgungssystemen, bei denen nur die für einen Beschichtungsvorgang jeweils benötigte Farbmenge in eine Versorgungsleitung eingespeist und zwischen zwei Molchen in Richtung zum Zerstäuber gefördert wird (DE 10033987 und DE 10131562).Relatively small color losses also occur with newer ones Ink supply systems in which only those for a coating process the required amount of paint in each supply line fed and between two newts towards Atomizer is promoted (DE 10033987 and DE 10131562).

Unvermeidbar ergeben sich aber beim Farbwechsel in den mit Molchtechnik arbeitenden bekannten Farbversorgungssystemen Farbverluste innerhalb der Zerstäuber, bei denen es sich z. B. in der Fahrzeugindustrie üblicherweise um elektrostatische Hochrotationszerstäuber oder Luftzerstäuber handeln kann. In beiden Fällen wird der Farbfluss zwischen einem Farbeingangskanal im Farbrohr des Zerstäubers und der Farbdüse durch das Hauptnadelventil gesteuert, das als 2/2-Wegeventil beim Lackiervorgang den Farbfluss vom Farbeingangskanal zur Düse freigibt und in seiner anderen Schaltstellung stattdessen eine Verbindung zwischen dem Farbeingangskanal und einem ebenfalls durch das Farbrohr verlaufenden Farbrückführungskanal öffnet. Bei Hochrotationszerstäubern verläuft durch das Farbrohr ferner noch ein separater Kanal für Spülmittel zum Kurzspülen der Zerstäuberglocke, während sich die Nadel des Hauptnadelventils durch den Farbrückführungskanal erstrecken kann (DE 9321294 U1). Bei einem Farbwechsel wird die in den Zu- und Rückführungskanälen befindliche Farbe mit dem zum Reinigen verwendeten Spülmittel verworfen.But inevitably arise when changing colors in the Known paint supply systems using pigging technology Color loss within the atomizer, which is e.g. B. in the automotive industry usually around electrostatic High-speed atomizers or air atomizers can act. In In both cases, the color flow between a color input channel in the paint tube of the atomizer and the paint nozzle through the Main needle valve controlled, as a 2/2-way valve during the painting process the ink flow from the ink inlet channel to the nozzle is released and a connection in its other switch position instead between the paint input channel and one too the color return duct running through the paint tube opens. With high-speed rotary atomizers also runs through the paint tube another separate channel for detergent for short rinsing of the atomizer bell, while the needle of the main needle valve can extend through the color return channel (DE 9321294 U1). If there is a color change, it will be in the feed and return channels color with that used for cleaning Discarded detergent.

Aufgabe der Erfindung sind ein Verfahren zur Farbversorgung eines Zerstäubers bzw. eine Beschichtungsvorrichtung, die noch geringere Farbverluste ermöglichen als bisher.The object of the invention is a method for supplying a color Atomizer or a coating device that still enable lower color losses than before.

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

Bei den Farbeingangs- und Farbausgangskanälen kann es sich typisch um die Farbbohrung im Farbrohr der zur Serienbeschichtung von Fahrzeugkarossen üblichen Hochrotationszerstäuber oder Luftzerstäuber bzw. um deren Farbdüse handeln. Aufgrund der Erfindung geht bei einem Farbwechsel im Zerstäuber nur noch der minimale Farbrest verloren, der sich in der Zerstäuberdüse befindet (in typischen Fällen etwa 0,5ml), während das in dem Farbrohr verbliebene Beschichtungsmaterial in das Farbversorgungssystem zurückgemolcht wird.It can be typical for the color input and color output channels around the paint hole in the paint tube for series coating of vehicle bodies usual high-speed atomizers or Air atomizers or their paint nozzle. Because of the invention when changing colors in the atomizer, only the minimal paint residue lost, which is in the atomizer nozzle (typically about 0.5ml) while that in the Paint tube remaining coating material in the paint supply system is pigged back.

Darüber hinaus ergeben sich vorteilhafte Reinigungsmöglichkeiten, beispielsweise wenn der Molch während seiner Bewegung in Richtung zu seiner Zielstation an der Farbdüse eine vorbestimmte Menge des den Eingangskanal des Beschichtungsmaterials füllenden Spülmittels in den dem Steuerventil nachgeschalteten Ausgangskanal des Zerstäubers drückt. Da die als Eingangskanal dienende Farbbohrung am Ende des Spülens zweckmäßig mit Spülmittel geflutet ist, kann anschließend zum Kurzspülen der Düse der von dem neuen Farblack in Richtung zu der düsenseitigen Molchstation bewegte Molch eine vorbestimmte Menge des die Farbbohrung füllenden Spülmittels durch die Düse hindurch und aus dem Zerstäuber herausdrücken.In addition, there are advantageous cleaning options, for example when the newt is moving in A predetermined direction towards its target station at the paint nozzle Amount of filling the input channel of the coating material Detergent in the downstream of the control valve Output channel of the atomizer presses. As the input channel serving color hole at the end of rinsing expediently with detergent is flooded, can then be used to rinse the nozzle that of the new color varnish towards the nozzle side Pigging station moved a predetermined amount of the pig Color hole filling detergent through the nozzle and push out of the atomizer.

An den in der Zeichnung schematisch dargestellten Ausführungsbeispielen wird die Erfindung näher erläutert. Es zeigen

  • Fig. 1 ein die Farbrohr- und Farbdüsenanordnung eines elektrostatischen Hochrotationszerstäubers an sich üblicher Art enthaltendes System; und
  • Fig. 2 ein gegenüber Fig. 1 abgewandeltes Ausführungsbeispiel.
    • The invention is explained in more detail using the exemplary embodiments shown schematically in the drawing. Show it
  • 1 shows a system containing the paint tube and paint nozzle arrangement of an electrostatic high-speed rotary atomizer which is conventional per se; and
  • Fig. 2 shows a modified embodiment of FIG. 1.

    • Fig. 1 zeigt das mit der Farbdüse 10 verbundene Farbrohr 12 des Hochrotationszerstäubers. Durch das Farbrohr 12 führt der Farbeingangskanal 14 zu dem als Steuerventil zum Ein- und Ausschalten des Sprühstrahls dienenden Hauptnadelventil 16, an das der Farbausgangskanal 18 der Farbdüse 10 angeschlossen ist. Die parallel zu dem Kanal 14 verlaufende Nadelbohrung 20 des Farbrohrs 12, durch die sich die Nadel 22 des Hauptnadelventils 16 erstreckt, ist über einen Kanal 24 an einen Ventilblock 26 mit einem Spülmittelventil V, einem Ventil MSM für ein Molchschiebemedium wie beispielsweise Druckluft oder ein sonstiges Druckgas, ein Ventil V für Verdünner oder sonstiges Spülmittel und ein Ventil PL für Pulsluft angeschlossen. Ohne innere Verbindung mit den Kanälen 14 und 18 und dem Hauptnadelventil 16 führt durch das Farbrohr 12 ein an ein Spülmittelventil KS angeschlossener gesonderter Kanal 28 für Spülmittel zum Kurzspülen des Glockentellers in bekannter Weise. Fig. 1 shows the paint tube 12 connected to the paint nozzle 10 Speed rotary atomizer. The paint inlet channel leads through the paint tube 12 14 to the as a control valve for switching on and off of the spray serving main needle valve 16 to which the Color output channel 18 of the paint nozzle 10 is connected. The parallel to the channel 14 extending needle bore 20 of the paint tube 12 through which the needle 22 of the main needle valve 16 extends to a valve block 26 via a channel 24 a flushing valve V, a valve MSM for a pig push medium such as compressed air or another compressed gas, a valve V for thinner or other detergent and a valve PL for pulsed air is connected. Without an inner connection with the channels 14 and 18 and the main needle valve 16 leads through the color tube 12 to a detergent valve KS connected separate channel 28 for detergent for short rinsing the bell plate in a known manner.

    Der Farbeingangskanal 14 ist erfindungsgemäß molchbar und außerhalb des Farbrohrs 12 an eine erste Molchstation 30 angeschlossen. Die Molchstation 30 ist ihrerseits mit einer Ventilanordnung 34 mit einem Farbventil F und einem Rückführventil RF1 verbunden, beispielsweise über eine gemeinsame Leitung 35, doch könnten auch getrennte Leitungen zu diesen Ventilen führen. Die zweite Molchstation 32 ist darstellungsgemäß innerhalb des Farbrohrs 12 an dem steuerventilseitigen Ende des Farbeingangskanals 14, also unmittelbar an dessen Verbindung zu dem Hauptnadelventil 16 angeordnet. In der zweiten Molchstation 32 ist der Molch 33 dargestellt. An beiden Molchstationen 30 und 32 können sich Sensoren zur Überwachung der jeweiligen Molchendposition befinden, mit denen hohe Steuergenauigkeit der nachfolgend beschriebenen Molch- und Andrückvorgänge erreichbar ist.The paint inlet channel 14 is piggable and outside according to the invention of the color tube 12 connected to a first pig station 30. The pig station 30 in turn has a valve arrangement 34 with a color valve F and a return valve RF1 connected, for example via a common line 35, however, separate lines could also lead to these valves. The second pig station 32 is shown inside of the paint tube 12 at the end of the paint inlet channel on the control valve side 14, ie immediately at its connection to the Main needle valve 16 arranged. In the second pig station 32 the pig 33 is shown. At both pig stations 30 and 32 can be sensors for monitoring the respective pig end position are with which high control accuracy of pig and pressure processes described below can be reached is.

    Bei dem betrachteten Beispiel ist der am freien Ende der Nadel 22 angeordnete zylindrische Nadelkopf 23 des Hauptnadelventils 16 in einer zylindrischen Ventilbohrung 25 im Farbrohr 12 verschiebbar, die an dem der Nadel abgewandten Ende mit der Farbdüse des Zerstäubers, d.h. mit dem Farbausgangskanal 18 verbunden ist, und an deren Mitte die vom Farbeingangskanal 14 kommende Querbohrung 15 mündet. Bei diesem Beispiel ist das Hauptnadelventil 16 zwischen den in der Zeichnung durch entsprechende Pfeile angedeuteten drei Ventilstellungen umschaltbar (im Gegensatz zu den bisher bekannten und üblichen Zerstäubern, deren Hauptnadelventil als 2/2-Wegeventil nur zwei Schaltstellungen hat). In der Ventilstellung 1 sitzt der Nadelkopf 23 an dem düsenseitigen Ende der Ventilbohrung 25, so dass der Weg in den Kanal 18 der Farbdüse 10 abgesperrt ist, während der von der Molchstation 32 und der Querbohrung 15 durch die Ventilbohrung 25 in die Nadelbohrung 20 führende Weg offen ist. In der Zeichnung ist der Nadelkopf 23 in der Ventilstellung 2 dargestellt, in der er die Verbindung der Querbohrung 15 mit dem Innenraum des Ventils sperrt und folglich die Molchstation 32 gegen die Farbdüse 10 und gegen die Nadelbohrung 20 abdichtet. In der in der Zeichnung unteren Ventilstellung 3 schließlich ist der Weg zwischen der Ventilbohrung 25 und der Nadelbohrung 20 gesperrt, während die Molchstation 32 mit der Farbdüse 10 verbunden ist.In the example under consideration, this is at the free end of the needle 22 arranged cylindrical needle head 23 of the main needle valve 16 displaceable in a cylindrical valve bore 25 in the paint tube 12, at the end facing away from the needle with the paint nozzle the atomizer, i.e. connected to the color output channel 18 is, and in the middle of that coming from the paint input channel 14 Cross bore 15 opens. In this example, the main needle valve is 16 between the corresponding in the drawing Arrows indicated three valve positions switchable (in Contrary to the previously known and usual atomizers, their Main needle valve as a 2/2-way valve only two switch positions Has). In the valve position 1, the needle head 23 sits on the nozzle-side end of the valve bore 25, so that the way in the Channel 18 of the paint nozzle 10 is shut off during the Pig station 32 and the transverse bore 15 through the valve bore 25 leading into the needle bore 20 is open. In the drawing the needle head 23 is shown in the valve position 2, in which he connects the transverse bore 15 to the interior of the valve blocks and consequently the pig station 32 against the Paint nozzle 10 and seals against the needle bore 20. In the in the drawing lower valve position 3 is finally the way blocked between the valve bore 25 and the needle bore 20, while the pig station 32 is connected to the paint nozzle 10.

    Zur Erläuterung der Betriebsweise bei einem Farbwechsel sei angenommen, dass vor Beginn des Beschichtungsvorgangs der Molch 33 sich in der ersten Molchstation 30 befindet, der Weg vom Ventilblock 26 über den Kanal 24, das Hauptnadelventil 16, den Farbeingangskanal 14 und die Leitung 35 bis zu der Ventilanordnung 34 mit vom Ventilblock 26 zugeführtem Spülmittel gefüllt sind, während sich im Farbausgangskanal 18 noch ein Rest der vorherigen Farbe befindet, und die Ventilnadel 22 zunächst in die Ventilstellung 1 gestellt ist. Nach Öffnen des Farbventils F der Ventilanordnung 34 wird der Molch bei offenem Rückführventil RF von dem durch die Leitung 35 kommenden neuen Farblack aus seiner Quellstation 30 durch den Kanal 14 in Richtung zu seiner Zielstation 32 geschoben, wobei das entsprechende Spülmittelvolumen durch das Spülmittelventil RF entfernt wird. Sobald der Molch hierbei einen vorbestimmten Punkt längs der Molchstrecke erreicht, kann zum Kurzspülen der Farbdüse 10 das Ventil RF geschlossen und das Hauptnadelventil 16 aus der Ventilstellung 1 in die Ventilstellung 3 umgeschaltet werden, so dass der Molch bei seiner weiteren Bewegung das Spülmittel aus dem Kanal 14 durch die Düse 10 hindurch aus dem Zerstäuber herausdrückt, beispielsweise in die Lackierkabine. Der vorbestimmte Umschaltpunkt kann auf unterschiedliche Weise definiert werden, z. B. nach Ablauf einer definierten Zeit oder durch das Signal einer auf das Erscheinen des Molches an der vorbestimmten Stelle ansprechenden Molchsensors oder auch durch Messen der durch das Farbventil F einfließenden Farbmenge. Vorteilhaft ist infolgedessen die zum Kurzspülen der Düse 10 verwendete Spülmittelmenge immer konstant und reproduzierbar. Der Molchandrückvorgang ist beendet, sobald der Molch 33 in seiner Zielstation 32 ankommt.To explain the mode of operation when changing colors, let us assume that before the coating process starts the pig 33 is in the first pig station 30, the way from Valve block 26 via the channel 24, the main needle valve 16, the Paint input channel 14 and line 35 to the valve assembly 34 filled with detergent supplied by the valve block 26 are, while there is still a remainder in the color output channel 18 previous color, and the valve needle 22 first in the valve position 1 is set. After opening the color valve F of valve assembly 34 becomes the pig when the recirculation valve is open RF from the new paint coming through line 35 from its source station 30 through channel 14 towards pushed its target station 32, the corresponding detergent volume is removed by the detergent valve RF. As soon as the pig here a predetermined point along the Pig line reached, for short rinsing the paint nozzle 10 that Valve RF closed and the main needle valve 16 out of the valve position 1 can be switched to valve position 3, see above that the newt moves out the detergent as it moves pushes the channel 14 out of the atomizer through the nozzle 10, for example in the paint booth. The predetermined one Switchover point can be defined in different ways z. B. after a defined time or by Signal one on the appearance of the newt at the predetermined Place appealing pig sensor or by measuring the amount of paint flowing in through the paint valve F. Advantageous is consequently the one used to rinse the nozzle 10 The amount of detergent is always constant and reproducible. The newt press process is finished as soon as the newt 33 in its target station 32 arrives.

    Wenn der Molch 33 von dem Farblack in die Zielstation 32 gedrückt worden ist, kann durch Umschalten des Hauptnadelventils 16 in die Ventilstellung 3 die Farbdüse 10 "angedrückt", d.h. der Farblack an dem Molch vorbei bis zur Düsenauslassöffnung gedrückt werden. Danach wird das Hauptnadelventil in seine Stellung 2 geschaltet, so dass das System lackierbereit ist.When the pig 33 is pressed from the paint into the target station 32 can by switching the main needle valve 16 the ink nozzle 10 is "pressed" into the valve position 3, i.e. the colored paint past the pig to the nozzle outlet opening be pressed. After that, the main needle valve is in its Position 2 switched so that the system is ready for painting.

    Wenn sich bei geöffnetem Farbventil F der Molch 33 in seiner Zielstation 32 befindet, kann unter Steuerung durch das Hauptnadelventil 16 lackiert werden. Bei der Ventilstellung 3 tritt der Farblack durch den Kanal 18 aus der Farbdüse 10 aus. Zur Unterbrechung des Lackflusses wird das Hauptnadelventil 16 in seine Stellung 2 zurückgeschaltet.If the pig 33 is in its position when the color valve F is open Target station 32 is located, under the control of the main needle valve 16 can be painted. At valve position 3 occurs the colored paint through the channel 18 out of the paint nozzle 10. to Interruption of the paint flow becomes the main needle valve 16 in his position 2 switched back.

    Am Ende des Beschichtungsvorgangs wird das Hauptnadelventil 16 zunächst in seine Stellung 2 geschaltet und das Farbventil F geschlossen. Anschließend wird zum Molchen des Kanals 14 das Hauptnadelventil 16 in die Ventilstellung 1 umgeschaltet und ein Ventil für Molchschiebemedium geöffnet, beispielsweise das Ventil MSM im Ventilblock 26. Zugleich wird das Farbventil F der Ventilanordnung 34 geöffnet. Von dem Schiebemedium wird der Molch 32 aus seiner Position in der Zielstation 32, in der er sich in unmittelbarer Nähe der Farbdüse 10 befindet, in seine Quellstation 30 zurückgeschoben, wobei er den gesamten im Farbrohr 12 (mit Ausnahme der Ventilbohrung 25 und der kurzen Querbohrung 15) befindlichen Farblack zur Quellstation und durch diese hindurch in das Farbversorgungssystem zurückdrückt. Als Schiebemedium könnte auch Spülmittel aus dem Ventil V verwendet werden.At the end of the coating process, the main needle valve 16 first switched to its position 2 and the color valve F closed. This is then used to pig the channel 14 Main needle valve 16 switched to valve position 1 and a valve for pig push medium opened, for example that Valve MSM in the valve block 26. At the same time, the color valve F the valve assembly 34 opened. From the sliding medium Newt 32 from its position in the target station 32 in which it is in the immediate vicinity of the paint nozzle 10, in his Source station 30 pushed back, being the whole in the paint tube 12 (with the exception of valve bore 25 and the short cross bore 15) located paint to the source station and through pushes it back into the paint supply system. As Sliding medium could also use detergent from valve V. become.

    Nach dem Zurückdrücken des Molches 33 können die farbführenden Kanäle durch das Spülmittel gespült werden, das aus dem Ventil V bis in die an das Rückführventil RF1 der Ventilanordnung 34 angeschlossene Rückführleitung der Molchstation 30 fließt. Das Hauptnadelventil 16 befindet sich hierbei in der Ventilstellung 1. Am Ende des Spülvorgangs ist der Farbeingangskanal 14 wieder wie vor Beschichtungsbeginn mit dem Spülmittel geflutet.After pushing the pig 33 back, the color-guiding Channels are flushed through the detergent that comes out of the valve V into that to the return valve RF1 of the valve arrangement 34 connected return line of the pig station 30 flows. The Main needle valve 16 is in the valve position 1. At the end of the rinsing process, the paint inlet channel 14 is again flooded with the detergent as before the start of the coating.

    Der Ventilanordnung 34 an der Molchquellstation kann ein an sich beliebiges Dosiersystem vorgeschaltet sein, das beispielsweise durch eine Dosierpumpe, durch Kolbendosierung oder Farbmengenmessung und insbesondere auch durch eines der in den Patentanmeldungen DE 10033987, DE 10131562 oder DE ...(15545) vom 27.11.2001 beschriebenen A/B-Molchsysteme gebildet sein kann, bei denen jeweils die gewünschte vorbestimmte Farbmenge zwischen zwei Molchen durch eine isolierende Leitung gefördert wird. In jedem Fall befindet sich die als Quellstation dienende Molchstation 30 in unmittelbarer Nähe des Dosiersystems. Wenn das vorgeschaltete Dosiersystem ein Molchsystem ist, soll sich dessen Zielstation nahe an der Molchstation 30 befinden.The valve assembly 34 at the pig swell station can be on any dosing system can be connected upstream, for example by a dosing pump, by piston metering or ink quantity measurement and in particular also by one of the patent applications DE 10033987, DE 10131562 or DE ... (15545) dated 27/11/2001 described A / B pig systems can be formed in each of which the desired predetermined amount of color between conveyed two newts through an insulating line becomes. In any case, the one serving as the source station is located Pig station 30 in the immediate vicinity of the dosing system. If the upstream dosing system is a pigging system whose target station is close to the pig station 30.

    Die Molchstation 30 befindet sich außerhalb des Farbrohrs 12 und in der Regel auch außerhalb des Zerstäubers und ist mit dem im Farbrohr 12 befindlichen Teil des Farbeingangskanals 14 über ein molchbares, eine Fortsetzung des Kanals 14 bildendes Leitungsstück 14' verbunden. Wenn der das Farbrohr 12 enthaltende Zerstäuber beispielsweise manuell oder in an sich bekannter Weise automatisch auswechselbar am Handgelenk eines Lackierroboters montiert ist, kann sich dieses Leitungsstück 14' durch eine molchbare Kupplung 44 an der Schnittstelle zwischen dem Zerstäuber und dem Roboterhandgelenk und durch das Handgelenk hindurch bis in den anschließenden Roboterarm erstrecken, in dem die Molchstation 30 untergebracht sein kann. Auch die Ventilanordnungen 26 und 34 befinden sich zweckmäßig außerhalb des Zerstäubers. Ein Zerstäuberwechsel erfolgt zweckmäßig nach einem Spülvorgang mit anschließendem Trockenblasen der Molchstrecke mit Pulsluft und vor dem oben beschriebenen Molchandrückvorgang, wobei die das Leitungsstück 14' bildenden Leitungsoder Schlauchteile an der Kupplung 34 getrennt werden. Die zum Trockenblasen vor dem Abkoppeln dienende Pulsluft kann durch das Ventil PL des Ventilblocks 26 eingeblasen werden oder in umgekehrter Richtung aus einem Ventil der Anordnung 34 bis in das Rückführventil RF des Ventilblocks 26 fließen. Anschließend kann das System wieder in der beschriebenen Weise mit dem Spülmittel gefüllt werden.The pig station 30 is located outside the paint tube 12 and usually outside of the atomizer and is with the part of the paint inlet channel 14 located in the paint tube 12 a piggable pipe section forming a continuation of the channel 14 14 'connected. If the containing the color tube 12 Atomizers, for example, manually or in a known manner Automatically interchangeable on the wrist of a painting robot is mounted, this line piece 14 'through a piggable coupling 44 at the interface between the Atomizer and the robot wrist and through the wrist extend into the subsequent robot arm, in which the pig station 30 can be accommodated. The valve arrangements too 26 and 34 are conveniently located outside of Atomizer. An atomizer change is advisable after a Flushing process followed by blowing the pig section dry with pulsed air and before the pig pressing process described above, the line or lines forming the line section 14 ' Hose parts on the coupling 34 are separated. The for Pulse air that serves to blow dry before decoupling can pass through the valve PL of the valve block 26 are blown in or in reverse direction from a valve of the arrangement 34 to in the return valve RF of the valve block 26 flow. Subsequently the system can be used again with the detergent in the manner described be filled.

    Bei dem in Fig. 1 dargestellten Beispiel dient die Nadelbohrung 20 sowohl als Rückführleitung für das Spülmittel beim Andrücken des Molches als auch als Zuführleitung für das Molchschiebemedium. Das hier beschriebene Molchen des Farbeingangskanals ist aber nicht nur mit dem Hauptnadelventil 16 des dargestellten Ausführungsbeispiels realisierbar. Es kann auch ein in bekannter Weise zwischen nur zwei Ventilstellungen umschaltbares Nadelventil verwendet werden, wobei an die Molchstation 32 eine gesonderte Leitung für das erforderliche Molchschiebemedium angeschlossen ist.In the example shown in Fig. 1, the needle bore is used 20 both as a return line for the detergent when pressed the pig as well as a feed line for the pig pushing medium. The pig of the paint inlet channel described here is but not only with the main needle valve 16 of the illustrated Realizable embodiment. It can also be a known one Needle valve switchable between only two valve positions can be used, at the pig station 32 a separate line connected for the required pig push medium is.

    Ein Beispiel hierfür ist in Fig. 2 dargestellt, in der die Farbdüse 110 mit dem Farbausgangskanal 118, der Farbeingangskanal 114 mit den Molchstationen 130 und 132 und die molchbare Kupplung 137 dem Ausführungsbeispiel nach Fig. 1 entsprechen. Das Hauptnadelventil 116 ist jedoch das in Rotationszerstäubern übliche (billige) 2/2-Wegeventil, das von seinem Antrieb 123 nur zwischen zwei Stellungen umgeschaltet wird, in denen es den Weg von der Molchstation 132 über die Querbohrung 115 in den Farbausgangskanal 118 der Farbdüse öffnet bzw. sperrt. Als Leitung für Molchschiebemedium, Spülmittel und ggf. Druckluft dient hier nicht die Nadelbohrung 120, sondern ein parallel zu der Nadelbohrung und zu dem Farbeingangskanal 114 durch das Farbrohr 112 verlaufender gesonderter Kanal 117, der am einen Ende außerhalb des Farbrohrs 112 an einen dem Block 26 entsprechenden Ventilblock 126 und an seinem anderen Ende auf der dem Kanal 114 abgewandten Seite des Molches 133 an eine außerhalb des Farbwegs befindliche Kammer 135 der Molchstation 132 angeschlossen ist. Die als Parknische für den Molch 133 dienende Molchkammer 135 und damit der gesonderte Kanal 117 sind durch den Molch vorteilhaft gegen den Farbweg abgedichtet. Abgesehen von dem einfacheren Hauptnadelventil 116 hat dieses Ausführungsbeispiel den Vorteil, dass keine Vermischung von Molchschiebemedium, Luft oder Spülmittel (Verdünner) beim Start der Molchbewegung möglich ist.An example of this is shown in Fig. 2, in which the Paint nozzle 110 with the ink outlet channel 118, the ink inlet channel 114 with the pig stations 130 and 132 and the piggable Coupling 137 correspond to the exemplary embodiment according to FIG. 1. The main needle valve 116 is, however, that in rotary atomizers usual (cheap) 2/2-way valve, which by its actuator 123 is only switched between two positions in which it is the Away from the pig station 132 via the cross bore 115 in the Paint outlet channel 118 of the paint nozzle opens or blocks. As a line for pig pushing medium, washing-up liquid and possibly compressed air not the needle bore 120, but a parallel to it the needle bore and to the ink inlet channel 114 through the Color tube 112 running separate channel 117, the one End outside the color tube 112 to a corresponding to the block 26 Valve block 126 and at its other end on the Channel 114 facing away from the pig 133 to an outside chamber 135 of the pig station 132 connected to the paint path is. The one that serves as a parking niche for the newt 133 Pig chamber 135 and thus the separate channel 117 are through the pig advantageously sealed against the color path. apart of the simpler main needle valve 116 has this embodiment the advantage that there is no mixing of the pig pushing medium, Air or detergent (thinner) at the start of the Pig movement is possible.

    Die Betriebsweise entspricht im übrigen dem Ausführungsbeispiel nach Fig. 1. Anstelle der Leitung 35 können aber das Rückführventil RF1 und das Farbventil F der Ventilanordnung 134 darstellungsgemäß über getrennte Kanäle an die Molchstation 130 angeschlossen sein.The mode of operation otherwise corresponds to the exemplary embodiment 1. Instead of line 35, however, the return valve can RF1 and the color valve F of the valve assembly 134 as shown via separate channels to the pig station 130 be connected.

    Bei beiden Ausführungsbeispielen kann der Farbeingangskanal des Farbrohrs 12 bzw. 112 an ein A/B-Farbversorgungssystem angeschlossen sein, wie es in der Patentanmeldung DE 101 57 966.7 beschrieben ist, bei dem also zur dosierten Materialversorgung zwei Kolbendosierbehälter oder andere mit automatisch änderbarer Ausflussrate entleerbare Farbbehälter einander abwechselnd jeweils mit Farbmaterial gefüllt werden, das mit vorbestimmtem Volumen in eine vorgeschaltete Versorgungsleitung geleitet und von einem Molch in den Behälter gedrückt wird.In both embodiments, the color input channel of the Paint tube 12 or 112 connected to an A / B paint supply system be as it is in the patent application DE 101 57 966.7 is described, in other words for the metered supply of material two piston dosing containers or others with automatically changeable Outflow rate of empty paint containers alternately each filled with color material that with predetermined Volume in an upstream supply line and is pushed into the container by a newt.

    Das anhand der Zeichnung erläuterte Molchsystem eignet sich nicht nur für Hochrotationszerstäuber, sondern ebenso auch für beliebige sonstige Zerstäubertypen.The pigging system explained on the basis of the drawing is suitable not only for high-speed rotary atomizers, but also for any other atomizer types.

    Claims (13)

    1. A method of supplying paint to an atomiser for serially coating work pieces with coating material of variable colour, in which the different coloured material is conducted during coating operation out of a paint inlet passage (14) through an operational control valve (16) into a, in particular, nozzle-like paint outlet passage (18), characterised in that the coating material remaining in the paint inlet passage (14) after a coating process is forced back with a pig (33) from the end of the paint inlet passage (14) directed towards the operational control valve (16) in the direction towards its opposite end.
    2. A method as claimed in claim 1, characterised by the following steps:
      the pig (33) is pushed by or in front of the coating material from a first pig station (30), which is connected to the end, remote from the operational control valve (16), of the paint inlet passage (14), through the paint inlet passage into a second pig station (32) located at the operational control valve (16) or in its vicinity;
      the coating material is conducted through the operational control valve (16) into the paint outlet passage (18) whilst the pig (33) is situated in the second pig station (32);
      after termination of the coating process, the pig (33) is moved back into the first pig station (30) by a thrust medium, which is conducted through a separate passage (20, 24, 117) into the control valve end of the paint inlet passage (14) or into the second pig station (32, 132), whereby the coating material remaining in the paint inlet passage (14) is forced back into a paint supply device F.
    3. A method as claimed in claims 1 or 2, characterised in that for the purpose of or after pushing the pig (33) back, a flushing agent is conducted out of a separate passage (20, 24, 117) into the control valve end of the paint inlet passage (14) and flows into a return conduit (35) RF1 connected to its opposite end.
    4. A method as claimed in claim 3, characterised in that before commencement of the coating process, the pig (33) forces, during its movement in the direction towards the second pig station (32), a predetermined amount of the flushing agent filling the paint inlet passage (14) into the paint outlet passage (18), connected downstream of the operational control valve (16), of the atomiser.
    5. A method as claimed in claim 4, characterised in that the predetermined amount is determined by switching over the operational control valve (16) after a predetermined time of the pig movement or by the signal from a pig sensor arranged on the paint inlet passage (14) or after reaching a predetermined amount of the coating material flowing into the paint inlet passage (14), which is determined by means of a metering device for the coating material or a flow measuring cell.
    6. A coating device including an atomiser for the serial coating of work pieces with coating material of varying colour, which includes a paint inlet passage (14) for the different coloured coating material, a, particularly nozzle-like, paint outlet passage (18) and an operational control valve (16) connected between the paint inlet and outlet passages (14, 18), characterised in that arranged at the control valve end of the paint inlet passage (14) of the atomiser, there is a pig station (32) and moveable back and forth through the paint inlet passage (14) between it and a pig station (30), which is connected to the end, remote from the operational control valve (16), of the paint inlet passage (14), there is a pig (33).
    7. A coating device as claimed in claim 6, characterised in that the pig station (32, 132) arranged on the paint outlet passage (18) is connected to a separate passage (20, 24, 117) with which a pig thrust medium and/or flushing agent can be conducted to the paint inlet passage (14) or the pig station (132) and that connected to the end, remote from the paint outlet passage (18), of the paint inlet passage (14), there is a return conduit RF1.
    8. A coating device as claimed in claim 7, characterised in that the operational control valve (16) is switchable between three valve positions and, in the first valve position, blocks the inlet of the paint outlet passage (18), whilst the pathway between the paint inlet passage (15) and the separate passage (20) is open; in the second valve position blocks the pathway between the paint inlet passage (14) and the paint outlet passage (18) and the pathway between the paint inlet passage (14) and the separate passage (20); and in the third valve position opens the pathway from the paint inlet passage (14) into the paint outlet passage (18) whilst the pathway between the paint inlet and outlet passages (14, 18) and the separate passage (20) is blocked.
    9. A coating device as claimed in claims 7 or 8, characterised in that the operational control valve (16) is a needle valve, whose valve needle (22) extends through the separate passage (20).
    10. A coating device as claimed in claim 7, characterised in that the operational control valve (116) is a needle valve, which is switchable only between two positions, in which it opens and closes, respectively, the pathway into the paint outlet passage (118) and that the separate passage (117) extends parallel to the paint inlet passage (114) through the paint tube (112) of the atomiser containing the paint inlet passage and the needle valve.
    11. A coating device as claimed in one of claims 6-10, characterised in that the pig station (132) arranged at the control valve end of the paint inlet passage (114) includes a chamber (135), which is situated outside the paint material pathway and serves as a parking recess for the pig (133).
    12. A coating device as claimed in one of claims 6-11, characterised in that the atomiser is mounted on an automatically controlled, multi-axis movement machine, in which the pig station (30), which is connected via a piggable connecting device (34) to the machine end of the paint inlet passage (14), is located outside the atomiser.
    13. A coating device as claimed in claim 12, characterised in that the atomiser is mounted to be manually or automatically replaceable on a painting robot and is connected to it by means of a piggable coupling (37).
    EP02025207A 2001-11-27 2002-11-11 Method and device for paint supply in a coating device using a pig Expired - Lifetime EP1314480B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10157938A DE10157938A1 (en) 2001-11-27 2001-11-27 Process for supplying paint to an atomizer and coating device
    DE10157938 2001-11-27

    Publications (2)

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    EP1314480A1 EP1314480A1 (en) 2003-05-28
    EP1314480B1 true EP1314480B1 (en) 2004-05-06

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    Application Number Title Priority Date Filing Date
    EP02025207A Expired - Lifetime EP1314480B1 (en) 2001-11-27 2002-11-11 Method and device for paint supply in a coating device using a pig

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    EP (1) EP1314480B1 (en)
    AT (1) ATE265892T1 (en)
    DE (2) DE10157938A1 (en)
    ES (1) ES2217234T3 (en)

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    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE60304386T2 (en) 2002-05-07 2006-12-28 Dürr Systems GmbH Method and paint supply system
    EP1362641B1 (en) 2002-05-07 2005-12-14 Dürr Systems GmbH Method and apparatus for delivering paint to an applicator and flushing same
    ATE314891T1 (en) 2002-05-07 2006-02-15 Duerr Systems Gmbh METHOD AND DEVICE FOR SUPPLYING AND APPLYING ELECTRICALLY CONDUCTIVE PAINT
    DE10239516A1 (en) * 2002-08-28 2004-03-18 Dürr Systems GmbH Hose with pig for delivery of electrically conductive fluid paints or varnishes at high voltage comprises an inner layer enclosed in an insulating layer with high voltage resistance
    DE102004016951A1 (en) 2004-04-06 2005-11-10 Dürr Systems GmbH Method for conveying a coating material and coating machine
    DE102004042512A1 (en) * 2004-09-02 2006-03-30 Hydac Accessories Gmbh valve device
    DE102015008216A1 (en) 2015-06-29 2016-12-29 Eisenmann Se Pig for a coating device and coating systems

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    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB8821571D0 (en) * 1988-09-15 1988-10-12 Lupa H T Paint spraying systems
    EP0888825B1 (en) * 1997-07-03 2003-08-20 Lactec Gesellschaft für moderne Lackiertechnik mbH Device for painting
    DE19742588B4 (en) * 1997-09-26 2009-02-19 Dürr Systems GmbH Method for serial coating of workpieces

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    DE10157938A1 (en) 2003-06-05
    ES2217234T3 (en) 2004-11-01
    EP1314480A1 (en) 2003-05-28
    ATE265892T1 (en) 2004-05-15
    DE50200406D1 (en) 2004-06-09

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