EP1380350A1 - Process and system with pig for the supply of a powder coating apparatus - Google Patents

Process and system with pig for the supply of a powder coating apparatus Download PDF

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Publication number
EP1380350A1
EP1380350A1 EP03015195A EP03015195A EP1380350A1 EP 1380350 A1 EP1380350 A1 EP 1380350A1 EP 03015195 A EP03015195 A EP 03015195A EP 03015195 A EP03015195 A EP 03015195A EP 1380350 A1 EP1380350 A1 EP 1380350A1
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EP
European Patent Office
Prior art keywords
pig
line
powder
coating
coating powder
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03015195A
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German (de)
French (fr)
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EP1380350B1 (en
Inventor
Thomas Dürr
Joachim Hering
Hans-Georg Fritz
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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
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • B05B12/1481—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet comprising pigs, i.e. movable elements sealingly received in supply pipes, for separating different fluids, e.g. liquid coating materials from solvent or air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/144—Arrangements for supplying particulate material the means for supplying particulate material comprising moving mechanical means

Definitions

  • the invention relates to a method and a system for supply a powder coating device according to the preamble of independent claims. In particular, it is about the serial coating of workpieces such as vehicle bodies with powder coating.
  • Powder coatings have hitherto usually been produced using an after Venturi principle working suction injector from an air fluidized container sucked in and over plastic hoses conveyed a powder-air mixture to the atomizer, whereby one promotes small powder volume in a large volume of air to overcome the pressure drop in the delivery hoses, however too high flow velocities and the resulting Inclination leads to deposits in the delivery hose.
  • accretions after coating had to be done with considerable effort et al be removed by blowing the hose empty because powder residues that dissolve later disrupt the coating and lead to color errors when changing colors. "Color disappearances" so far due to incomplete hose cleaning not avoid entirely. They also go through the Hose cleaning removed powder residue for the coating lost and must be disposed of.
  • the invention has for its object a method and system to supply a powder coating device, which is a precisely metered conveyance of the coating powder without the inevitable powder losses in known powder coating systems enable.
  • the invention makes transport practically loss-free the amount of powder dosed exactly for a coating process allows.
  • the relatively sensitive powder coating thanks to the lower transport speed high packing density transported much more gently than with the usual Venturi funding. It is advantageous also the lower air requirement for powder coating delivery.
  • the pig used according to the invention not only enables lossless powder transport, but at the same time in the known from liquid paint systems a very simple cleaning of the lines by completely stripping off all adhering ones Powder residue. Through the complete hose cleaning Color spread avoided.
  • the invention is particularly advantageous in other respects the color change options, for example due to short color change times and less color loss.
  • An additional advantage of the invention is that in the previous usual powder coating systems not easily implemented Possibility of reflow and push-out in the known from liquid coating systems to reduce powder losses.
  • the pigging back will include thereby allows the pig to work with the system described here both towards the atomizer and in the opposite direction can be pushed and promoted through the line.
  • atomizer 1 for powder coating such as on electrostatic powder rotary atomizer to one by one piggable hose formed line 2 connected through the the pig 3 the coating powder 4 towards the atomizer promotes.
  • the newt 3 is indicated by one at 5 Sliding medium driven and from a loading or sending station 6 in a discharge or upstream of the atomizer 1 Target station 7 moves.
  • the coating powder initiated.
  • a sliding medium can serve compressed air in the example considered.
  • the coating powder is said to on the side of the pig facing the destination a fluidization medium can usually be added Air to prevent powder from settling and sintering. 1 is used as the fluidization medium for the coating powder the push medium 5 of the pig 3 used that through a line passing through the pig along its direction of movement Opening such as the central bore 9 shown in the Coating powder 4 reaches the front of the pig.
  • the air-permeable pig in this example is said to be attached to its Perimeter preferably completely and without gaps on the inner wall line 2 so that it moves through the line the powder is completely stripped off and no powder residue lag behind the newt. Its opening should therefore not be on its scope, but how e.g. the bore 9 radially from the peripheral parts abutting the line be distant. These peripheral parts can, as shown at the axial ends of the pig radially above the central part of the newt and protrude in a manner known per se as Sealing lips be formed.
  • the pushing medium 5 of the pig 3 can be metered.
  • one in the transmitter station 6 of the newt 3 included or connected to this valve assembly can be provided with which the amount, ie a certain Volume per unit of time, and / or the pressure of the sliding medium, here the compressed air, precisely controllable or regulatable are so that the pig is a correspondingly precise predetermined Powder quantity promotes.
  • the air volume i.a. Proportional valves known, even those with which the Air pressure can be kept constant (e.g. similar to the color control loops described in DE 101 42 355).
  • An air-permeable newt is not the only option the fluidization of the coating powder on the pig front.
  • better fluidization with more uniform Air distribution can e.g. through an air permeable Reach delivery hose, which is also the frictional resistance for the newt.
  • the one shown in Fig. 2 Exemplary embodiment consists of the line 12 of the coating powder from an air-permeable inner shell 20, in the pig 13 to promote the coating powder 14 of its sliding medium similar to that in Fig. 1 between its transmitting station 16 and its target station 17 is moved, and one outer shell 21 closed to the outside.
  • the outer shell 21 can completely enclose the inner shell 20 and one with it annular air duct 22 for compressed air introduced from the outside form, which penetrates into the inner shell 20 and on the end face of the pig 13 fluidizes the coating powder while the pig on its back facing away from target station 17 acted upon in the drive direction.
  • With the sliding air in the Line 12 can be the coating powder similar to the embodiment 1 are metered.
  • the pig 13 can be impermeable to air here.
  • the fluidization 2 also has the advantage of better adjustability of the Conveying and fluidizing air volumes and the conveying speed.
  • a possible variation is to use the pig to convey it the coating powder with one for cleaning the pipe To drive solvents as a sliding medium, for example with cleaning fluid if for a complete separation between the solvent and the coating powder becomes.
  • FIGS. 3 and 3A An embodiment is shown in FIGS. 3 and 3A, in which the conveying the coating powder 34 through the line 32 Pig 33 instead of air or other gaseous Sliding medium driven by a liquid dosing medium 31 can be that of a metering pump 35 through a line 32 concentrically surrounding ring-shaped external line. 36 pumped becomes. Suitable metering pumps are, for example, from liquid paint systems known per se.
  • the dosing liquid drives the Powder pig 33 indirectly via one of her, in the outer line 36 located pushing or driving pig 37 on, the contact with the powder pig 33 non-positive due to the rod or annular magnetic elements 38 or 39 is coupled, the Magnetic field is indicated at 30.
  • this sliding air for fluidizing the Serve coating powder 34.
  • the coating powder could from the atomizer-side end of the line 32 be fluidized, or more generally, opposite to the conveying direction when the powder pig in both directions supports (for example in reflow mode). It is also conceivable the coating powder through one of the metering channel for the entrained pig separate external line with air-permeable Fluidize compound in the line of coating powder.
  • driver pig 37 instead of the dosing liquid by dosing air or another gaseous medium as To drive the sliding medium.
  • the total amount of the atomizer 41 to be fed To split coating powder 45 into several portions because the sum of the dosing errors of the subsets in some cases can be kept smaller than the error of one Total line subsidized. That from a container 40 Coming coating powder is used for this purpose in the loading or Transmitting station 46, for example, in the four shown lines leading parallel to the unloading or target station 44 42 directed and by a pig 43 through each Line conveyed to the transmitting station, where the subsets then be brought together again.
  • the lines 42 and pigs 43 can be one of the exemplary embodiments 1, 2 or 3 correspond if the Do not powder on the front of the pig in any other way is fluidized.
  • piggable line 52 in a ring from the Transmitting station 56 to the destination station 57 and from there back to the Transmitting station.
  • line 52 Through line 52, several can follow one another Newts 53, 54 are pushed, one between each Space with a predetermined volume for the coating powder to be conveyed 55 form.
  • the space between neighboring ones Pigs can be connected, for example, by connecting elements 50, 51 fixed or adjustable length can be defined.
  • the between the pig filled powder 55 can e.g. through an air permeable Wall of line 52 can be fluidized.
  • each between the pigs Amounts of powder required for a coating process promoted the same or different color and in the Target station are taken from where the newts through the return section 52 'of line 52 is pushed back into the transmitting station in order to be able to take up redefined quantities of powder. It is also conceivable, through the annular pigged line 52, 52 'continuously between a certain coating powder to promote the sending and target stations and her the coating powder similar to the ring line of known liquid paint supply systems can only be removed if necessary.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

The supply process supplies powder (4) to a powder paint atomizer (1). The powder is forced through the supply line (2) by a pig (3) and is fluidized on the side facing the pig. The fluidizing air can be supplied to the powder through a central passage (9) in the pig or through an air-permeable wall in the supply line. The pig-displacing medium is used for dosing the powder.

Description

Die Erfindung betrifft ein Verfahren und ein System zur Versorgung eines Pulverbeschichtungsgerätes gemäß dem Oberbegriff der unabhängigen Patentansprüche. Insbesondere handelt es sich um die Serienbeschichtung von Werkstücken wie beispielsweise Fahrzeugkarossen mit Pulverlack.The invention relates to a method and a system for supply a powder coating device according to the preamble of independent claims. In particular, it is about the serial coating of workpieces such as vehicle bodies with powder coating.

Pulverlacke werden bisher üblicherweise mit Hilfe eines nach dem Venturi-Prinzip arbeitenden Sauginjektors aus einem mit Luft fluidisierten Behälter angesaugt und über Kunststoffschläuche in einem Pulver-Luft-Gemisch zum Zerstäuber gefördert, wobei man geringes Pulvervolumen in einem großen Luftvolumen fördert, um den Druckabfall in den Förderschläuchen zu überwinden, was allerdings zu hohen Fließgeschwindigkeiten und der daraus resultierenden Neigung zu Anlagerungen im Förderschlauch führt. Anlagerungen mussten nach der Beschichtung mit beträchtlichem Aufwand u.a. durch Leerblasen des Schlauches entfernt werden, weil sich später wieder lösende Pulverreste die Beschichtung stören und bei einem Farbwechsel zu Farbfehlern führen. "Farbverschleppungen" lassen sich bisher wegen unvollkommener Schlauchreinigung nicht ganz vermeiden. Außerdem gehen die durch die Schlauchreinigung entfernten Pulverreste für die Beschichtung verloren und müssen entsorgt werden.Powder coatings have hitherto usually been produced using an after Venturi principle working suction injector from an air fluidized container sucked in and over plastic hoses conveyed a powder-air mixture to the atomizer, whereby one promotes small powder volume in a large volume of air to overcome the pressure drop in the delivery hoses, however too high flow velocities and the resulting Inclination leads to deposits in the delivery hose. accretions after coating had to be done with considerable effort et al be removed by blowing the hose empty because powder residues that dissolve later disrupt the coating and lead to color errors when changing colors. "Color disappearances" so far due to incomplete hose cleaning not avoid entirely. They also go through the Hose cleaning removed powder residue for the coating lost and must be disposed of.

Weitere unerwünschte Pulververluste ergeben sich durch hinsichtlich Menge und/oder Schaltzeiten ungenaue Dosierung des dem Zerstäuber zugeführten Beschichtungspulvers. Bei der Beschichtung als "Overspray" versprühtes, sich nicht auf dem Werkstück niederschlagendes Pulver kann zwar teilweise aufgefangen und zur erneuten Verwendung aufgearbeitet werden, doch ist es technologisch und ökologisch sinnvoll, die Overspraymenge so gering wie möglich zu halten. Dieses Problem wird auch durch spezielle, relativ aufwendige Dosiereinrichtungen bekannter Pulverbeschichtungsanlagen (EP 0 525 303, DE 199 37425) nicht befriedigend gelöst.Further undesirable powder losses result from Quantity and / or switching times inaccurate dosing of the atomizer supplied coating powder. When coating sprayed as "overspray" that does not deposit on the workpiece Powder can be partially collected and used reused, but it is technological and ecologically sensible, the overspray amount as low as to keep possible. This problem is also caused by special, relative complex metering devices of known powder coating systems (EP 0 525 303, DE 199 37425) unsatisfactory solved.

Die Schwierigkeiten bei der Reinigung der Pulverschläuche waren auch einer der Gründe dafür, dass es derzeit in der Praxis noch keine Pulverbeschichtungsanlagen für Fahrzeugkarossen gibt, die einen schnellen und häufigen Farbwechsel ermöglichen. Soweit in anderen Industriezweigen ein Pulverfarbwechsel vorgesehen war, musste man entweder entsprechend viele farbspezifische Lackierkabinen verwenden oder die Lackierkabine beim Farbwechsel jeweils vollständig reinigen und umrüsten (EP 0 200 681).The difficulties with cleaning the powder hoses were also one of the reasons that it is currently still in practice there are no powder coating systems for vehicle bodies that enable a quick and frequent color change. So far in other industrial sectors were intended to change powder colors, you either had to have as many color-specific paint booths use or the paint booth when changing colors completely clean and convert (EP 0 200 681).

Bei der Serienbeschichtung von Werkstücken wie Fahrzeugkarossen mit Flüssiglack häufig wechselnder Farbe werden schon seit einiger Zeit Molchsysteme u.a. zur Reduzierung von Lack- und Lösemittelverlusten eingesetzt (DE 197 09 988, DE 197 42 588, DE 100 33 986). Zur Förderung von Pulverlack konnten Molche aber bisher nicht ohne Weiteres verwendet werden, weil die übliche Fluidisierung durch die Luftströmung in Förderrichtung wegen der Sperrung der Leitung durch den Molch nicht möglich war, und wegen des hohen Reibungskoeffizienten, wegen der Neigung des Lackpulvers zu Ansinterungen unter Druck und zum Absetzen während der Förderung sowie wegen fehlender Kompressibilität.For the serial coating of workpieces such as vehicle bodies with liquid paint frequently changing color have been around for some Time pig systems etc. to reduce paint and solvent losses used (DE 197 09 988, DE 197 42 588, DE 100 33 986). But pigs were able to promote powder coating So far not easily used because the usual Fluidization due to the air flow in the direction of conveyance The line was not blocked by the newt, and because of of the high coefficient of friction due to the tendency of the paint powder for sintering under pressure and settling during funding and due to lack of compressibility.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und System zur Versorgung eines Pulverbeschichtungsgeräts anzugeben, die eine genau dosierte Förderung des Beschichtungspulvers ohne die bei bekannten Pulverbeschichtungsanlagen unvermeidbaren Pulverluste ermöglichen.The invention has for its object a method and system to supply a powder coating device, which is a precisely metered conveyance of the coating powder without the inevitable powder losses in known powder coating systems enable.

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

Durch die Erfindung wird ein praktisch verlustfreier Transport der jeweils exakt für einen Beschichtungsvorgang dosierten Pulvermenge ermöglicht. Zugleich wird der relativ empfindliche Pulverlack dank geringerer Transportgeschwindigkeit bei entsprechend hoher Packungsdichte wesentlich schonender transportiert als bei der bisher üblichen Venturi-Förderung. Vorteilhaft ist auch der geringere Luftbedarf zur Pulverlackförderung.The invention makes transport practically loss-free the amount of powder dosed exactly for a coating process allows. At the same time, the relatively sensitive powder coating thanks to the lower transport speed high packing density transported much more gently than with the usual Venturi funding. It is advantageous also the lower air requirement for powder coating delivery.

Eine genaue Dosierung, die u.a. die Oversprayverluste herabsetzt, wird auch durch die erfindungsgemäß möglichen kurzen Schaltzeiten beim Ein- und Ausschalten der Pulverförderung (erfindungsgemäß des Schiebemediums) erreicht.An exact dosage, which among other things reduces overspray losses, is also due to the short possible according to the invention Switching times when switching the powder feed on and off (according to the invention of the sliding medium) is reached.

Der erfindungsgemäß verwendete Molch ermöglicht aber nicht nur verlustfreien Pulvertransport, sondern zugleich in der an sich von Flüssiglacksystemen bekannten Weise eine sehr einfache Reinigung der Leitungen durch vollständiges Abstreifen aller anhaftenden Pulverreste. Durch die vollkommene Schlauchreinigung werden Farbverschleppungen vermieden.The pig used according to the invention not only enables lossless powder transport, but at the same time in the known from liquid paint systems a very simple cleaning of the lines by completely stripping off all adhering ones Powder residue. Through the complete hose cleaning Color spread avoided.

Besonders vorteilhaft ist die Erfindung im übrigen hinsichtlich der Farbwechselmöglichkeiten, etwa wegen kurzer Farbwechselzeiten und geringer Farbverluste.The invention is particularly advantageous in other respects the color change options, for example due to short color change times and less color loss.

Ein zusätzlicher Vorteil der Erfindung ist die bei den bisher üblichen Pulverlack-Beschichtungsanlagen nicht ohne Weiteres realisierbare Möglichkeit, durch Reflow und Push-Out in der an sich von Flüssiglacksystemen bekannten Weise Pulverluste zu reduzieren. Als Reflow wird das Zurückmolchen von nicht versprühten Beschichtungsmaterial aus dem zu dem Zerstäuber führenden Leitungssystem zurück in den der gemolchten Leitung vorgeschalteten Pulvervorrat bezeichnet. Das Zurückmolchen wird u.a. dadurch ermöglicht, dass der Molch bei dem hier beschriebenen System sowohl in Richtung zu dem Zerstäuber als auch in der Gegenrichtung durch die Leitung geschoben werden und fördern kann. An additional advantage of the invention is that in the previous usual powder coating systems not easily implemented Possibility of reflow and push-out in the known from liquid coating systems to reduce powder losses. As a reflow, the pigging back from non-sprayed Coating material from that leading to the atomizer Line system back into the upstream of the pigged line Called powder supply. The pigging back will include thereby allows the pig to work with the system described here both towards the atomizer and in the opposite direction can be pushed and promoted through the line.

Zweckmäßig kann hierbei zwischen die gemolchte Leitung und den Pulvervorrat eine in Richtung zu dem Pulvervorrat fördernde Pumpe geschaltet sein. Beim Push-Out wird dagegen nur die jeweils für einen Beschichtungsvorgang benötigte Pulvermenge in die gemolchte Leitung eingebracht und von dem Molch und zweckmäßigerweise eine der Leitung nachgeschaltete Pumpe in Richtung zu dem Zerstäuber gefördert.It can be useful between the pigged line and the Powder supply a pump that feeds towards the powder supply be switched. With push-out, on the other hand, only the quantity of powder required for a coating process into the pigged Line introduced and from the newt and expediently a downstream pump towards the Atomizers promoted.

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

Fig. 1
eine Leitung für Beschichtungspulver mit einem zur Fluidisierung luftdurchlässigen Molch;
Fig. 2
eine gemolchte Leitung für Beschichtungspulver mit einem zur Fluidisierung luftdurchlässigen Schlauch;
Fig. 3
eine Leitung für Beschichtungspulver mit einem Molch, der von einem mit ihm magnetisch gekuppelten Mitnehmermolch bewegt wird;
Fig. 3A
einen Schnitt durch Fig. 3 längs der Ebene A-A;
Fig. 4
eine Leitungsanordnung für Beschichtungspulver mit vier parallelen gemolchten Leitungen; und
Fig. 5
eine Ringleitung für Beschichtungspulver mit mehreren hintereinander durch die Leitung bewegten Molchen.
The invention is explained in more detail using the exemplary embodiments illustrated in the drawing. Show it
Fig. 1
a line for coating powder with an air-permeable pig for fluidization;
Fig. 2
a pigged line for coating powder with an air-permeable hose for fluidization;
Fig. 3
a line for coating powder with a pig which is moved by a driving pig magnetically coupled to it;
Figure 3A
a section through Figure 3 along the plane AA.
Fig. 4
a line arrangement for coating powder with four parallel pigged lines; and
Fig. 5
a ring line for coating powder with several pigs moved in succession through the line.

Gemäß Fig. 1 ist ein Zerstäuber 1 für Pulverlack wie z.B. ein elektrostatischer Pulver-Rotationszerstäuber an eine durch einen molchbaren Schlauch gebildete Leitung 2 angeschlossen, durch die der Molch 3 das Beschichtungspulver 4 in Richtung zu dem Zerstäuber fördert. Der Molch 3 wird von einem bei 5 angedeuteten Schiebemedium angetrieben und aus einer Belade- oder Sendestation 6 in eine dem Zerstäuber 1 vorgeschaltete Entlade- oder Zielstation 7 bewegt.1 is an atomizer 1 for powder coating such as on electrostatic powder rotary atomizer to one by one piggable hose formed line 2 connected through the the pig 3 the coating powder 4 towards the atomizer promotes. The newt 3 is indicated by one at 5 Sliding medium driven and from a loading or sending station 6 in a discharge or upstream of the atomizer 1 Target station 7 moves.

In der Sendestation 6 wird auf der Rückseite des Molches 3 das Schiebemedium und auf seiner der Zielstation zugewandten Vorderseite das Beschichtungspulver eingeleitet. Als Schiebemedium kann bei dem betrachteten Beispiel Druckluft dienen.In the transmitting station 6 on the back of the pig 3 that Sliding medium and on its front side facing the target station the coating powder initiated. As a sliding medium can serve compressed air in the example considered.

Während seiner Förderung durch die Leitung 2 soll dem Beschichtungspulver auf der der Zielstation zugewandten Seite des Molches ein Fluidisierungsmedium beigemengt werden, in der Regel Luft, um Absetzen und Ansinterungen des Pulvers zu verhindern. Gemäß Fig. 1 wird als Fluidisierungsmedium für das Beschichtungspulver das Schiebemedium 5 des Molches 3 verwendet, das durch eine den Molch längs seiner Bewegungsrichtung durchsetzende Öffnung wie z.B. die dargestellte zentrale Bohrung 9 in das Beschichtungspulver 4 auf der Frontseite des Molches gelangt.During its promotion through line 2, the coating powder is said to on the side of the pig facing the destination a fluidization medium can usually be added Air to prevent powder from settling and sintering. 1 is used as the fluidization medium for the coating powder the push medium 5 of the pig 3 used that through a line passing through the pig along its direction of movement Opening such as the central bore 9 shown in the Coating powder 4 reaches the front of the pig.

Der bei diesem Beispiel luftdurchlässige Molch soll an seinem Umfang vorzugsweise vollständig und lückenlos an der Innenwand der Leitung 2 anliegen, damit bei seiner Bewegung durch die Leitung das Pulver vollständig abgestreift wird und keine Pulverreste hinter dem Molch zurückbleiben. Seine Durchlassöffnung soll sich deshalb nicht an seinem Umfang befinden, sondern wie z.B. die Bohrung 9 radial von den an der Leitung anliegenden Umfangteilen entfernt sein. Diese Umfangteile können darstellungsgemäß an den axialen Enden des Molches radial über dem Mitteilteil des Molches vorspringen und in an sich bekannter Weise als Dichtlippen ausgebildet sein.The air-permeable pig in this example is said to be attached to its Perimeter preferably completely and without gaps on the inner wall line 2 so that it moves through the line the powder is completely stripped off and no powder residue lag behind the newt. Its opening should therefore not be on its scope, but how e.g. the bore 9 radially from the peripheral parts abutting the line be distant. These peripheral parts can, as shown at the axial ends of the pig radially above the central part of the newt and protrude in a manner known per se as Sealing lips be formed.

Zum Dosieren des dem Zerstäuber 1 zugeführten Beschichtungspulvers 4 kann das Schiebemedium 5 des Molches 3 dosiert werden. Zu diesem Zweck kann z.B. eine in der Sendestation 6 des Molches 3 enthaltene oder an diese angeschlossene Ventilanordnung (nicht dargestellt) vorgesehen sein, mit der die Menge, also ein bestimmtes Volumen pro Zeiteinheit, und/oder der Druck des Schiebemediums, hier also der Druckluft, genau steuerbar oder regelbar sind, so dass der Molch eine entsprechend genaue vorbestimmte Pulvermenge fördert. Zur Einstellung der Luftmenge sind u.a. Proportionalventile bekannt, auch solche, mit denen auch der Luftdruck konstant gehalten werden kann (z.B. ähnlich wie bei den in der DE 101 42 355 beschriebenen Farbregelkreisen).For dosing the coating powder supplied to the atomizer 1 4, the pushing medium 5 of the pig 3 can be metered. To for this purpose e.g. one in the transmitter station 6 of the newt 3 included or connected to this valve assembly (not shown) can be provided with which the amount, ie a certain Volume per unit of time, and / or the pressure of the sliding medium, here the compressed air, precisely controllable or regulatable are so that the pig is a correspondingly precise predetermined Powder quantity promotes. To adjust the air volume, i.a. Proportional valves known, even those with which the Air pressure can be kept constant (e.g. similar to the color control loops described in DE 101 42 355).

Ein luftdurchlässiger Molch ist nicht die einzige Möglichkeit der Fluidisierung des Beschichtungspulvers auf der Molchfrontseite. Eine in manchen Fällen bessere Fluidisierung mit gleichmäßigerer Luftverteilung lässt sich z.B. durch einen luftdurchlässigen Förderschlauch erreichen, der zugleich den Reibungswiderstand für den Molch herabsetzen kann. Bei dem in Fig. 2 dargestellten Ausführungsbeispiel besteht die Leitung 12 des Beschichtungspulvers aus einer luftdurchlässigen Innenhülle 20, in der der Molch 13 zur Förderung des Beschichtungspulvers 14 von seinem Schiebemedium ähnlich wie in Fig. 1 zwischen seiner Sendestation 16 und seiner Zielstation 17 bewegt wird, und einer nach außen geschlossenen Außenhülle 21. Die Außenhülle 21 kann die Innenhülle 20 vollständig umschließen und mit ihr einen ringförmigen Luftkanal 22 für von außen eingeleitete Druckluft bilden, die in die Innenhülle 20 eindringt und auf der Stirnseite des Molches 13 das Beschichtungspulver fluidisiert, während sie den Molch auf seiner der Zielstation 17 abgewandten Rückseite in Antriebsrichtung beaufschlagt. Mit der Schiebeluft in der Leitung 12 kann das Beschichtungspulver ähnlich wie bei dem Ausführungsbeispiel nach Fig. 1 dosiert werden.An air-permeable newt is not the only option the fluidization of the coating powder on the pig front. In some cases, better fluidization with more uniform Air distribution can e.g. through an air permeable Reach delivery hose, which is also the frictional resistance for the newt. The one shown in Fig. 2 Exemplary embodiment consists of the line 12 of the coating powder from an air-permeable inner shell 20, in the pig 13 to promote the coating powder 14 of its sliding medium similar to that in Fig. 1 between its transmitting station 16 and its target station 17 is moved, and one outer shell 21 closed to the outside. The outer shell 21 can completely enclose the inner shell 20 and one with it annular air duct 22 for compressed air introduced from the outside form, which penetrates into the inner shell 20 and on the end face of the pig 13 fluidizes the coating powder while the pig on its back facing away from target station 17 acted upon in the drive direction. With the sliding air in the Line 12 can be the coating powder similar to the embodiment 1 are metered.

Der Molch 13 kann hier luftundurchlässig sein. Die Fluidisierung gemäß Fig. 2 hat auch den Vorteil besserer Einstellbarkeit der Förder- und Fluidisierungs luftmengen und der Fördergeschwindigkeit. The pig 13 can be impermeable to air here. The fluidization 2 also has the advantage of better adjustability of the Conveying and fluidizing air volumes and the conveying speed.

Eine Abwandlungsmöglichkeit besteht darin, den Molch zum Fördern des Beschichtungspulver mit einem zur Reinigung der Leitung dienenden Lösemittel als Schiebemedium anzutreiben, beispielsweise mit Reinigungsflüssigkeit, wenn für eine vollkommene Trennung zwischen dem Lösemittel und dem Beschichtungspulver gesorgt wird.A possible variation is to use the pig to convey it the coating powder with one for cleaning the pipe To drive solvents as a sliding medium, for example with cleaning fluid if for a complete separation between the solvent and the coating powder becomes.

In Fig. 3 und Fig. 3A ist ein Ausführungsbeispiel dargestellt, bei dem der das Beschichtungspulver 34 durch die Leitung 32 fördernde Molch 33 statt durch Luft oder ein sonstiges gasförmiges Schiebemedium von einem flüssigen Dosiermedium 31 angetrieben werden kann, das von einer Dosierpumpe 35 durch eine die Leitung 32 konzentrisch umgebende ringförmige Außenleitung. 36 gepumpt wird. Geeignete Dosierpumpen sind beispielsweise aus Flüssiglacksystemen an sich bekannt. Die Dosierflüssigkeit treibt den Pulvermolch 33 indirekt über einen von ihr beaufschlagten, in der Außenleitung 36 befindlichen ringförmigen Schiebe- oder Mitnehmermolch 37 an, der mit dem Pulvermolch 33 berührungslos kraftschlüssig durch in den Molchen 33 und 37 befindliche stab- bzw. ringförmige Magnetelemente 38 bzw. 39 gekuppelt ist, deren Magnetfeld bei 30 angedeutet ist.An embodiment is shown in FIGS. 3 and 3A, in which the conveying the coating powder 34 through the line 32 Pig 33 instead of air or other gaseous Sliding medium driven by a liquid dosing medium 31 can be that of a metering pump 35 through a line 32 concentrically surrounding ring-shaped external line. 36 pumped becomes. Suitable metering pumps are, for example, from liquid paint systems known per se. The dosing liquid drives the Powder pig 33 indirectly via one of her, in the outer line 36 located pushing or driving pig 37 on, the contact with the powder pig 33 non-positive due to the rod or annular magnetic elements 38 or 39 is coupled, the Magnetic field is indicated at 30.

Zur Unterstützung des Antriebs des Pulvermolchs 33 kann dieser zusätzlich durch Schiebeluft auf seiner Rückseite, beaufschlagt werden. Wenn der Molch beispielsweise ähnlich wie in Fig. 1 luftdurchlässig ist, kann diese Schiebeluft zum Fluidisieren des Beschichtungspulvers 34 dienen. Andernfalls könnte das Beschichtungspulver von dem zerstäuberseitigen Ende der Leitung 32 her fluidisiert werden, oder allgemeiner gesagt, entgegengesetzt zu der Förderrichtung, wenn der Pulvermolch in beiden Richtungen fördert (beispielsweise bei Reflow-Betrieb). Es ist auch denkbar, das Beschichtungspulver durch eine von dem Dosierkanal für den Mitnehmermolch getrennte Außenleitung mit luftdurchlässiger Verbindung in die Leitung des Beschichtungspulvers zu fluidisieren. To support the drive of the powder pig 33, this can additionally acted on by sliding air on its back become. For example, if the newt is similar to that in FIG. 1 is permeable to air, this sliding air for fluidizing the Serve coating powder 34. Otherwise, the coating powder could from the atomizer-side end of the line 32 be fluidized, or more generally, opposite to the conveying direction when the powder pig in both directions supports (for example in reflow mode). It is also conceivable the coating powder through one of the metering channel for the entrained pig separate external line with air-permeable Fluidize compound in the line of coating powder.

Bei dem Ausführungsbeispiel nach Fig. 3 besteht auch die Möglichkeit, den Mitnehmermolch 37 statt mit der Dosierflüssigkeit durch dosierende Luft oder ein sonstiges gasförmiges Medium als Schiebemedium anzutreiben.3 there is also the possibility of the driver pig 37 instead of the dosing liquid by dosing air or another gaseous medium as To drive the sliding medium.

Zur Verbesserung der Dosiergenauigkeit kann es zweckmäßig sein, gemäß Fig. 4 die Gesamtmenge des dem Zerstäuber 41 zuzuführenden Beschichtungspulvers 45 in mehrere Teilmengen aufzuteilen, da die Summe der Dosierfehler der Teilmengen in manchen Fällen kleiner gehalten werden kann als der Fehler der in einer einzigen Leitung geförderten Gesamtmenge. Das aus einem Behälter 40 kommende Beschichtungspulver wird zu diesem Zweck in der Beladeoder Sendestation 46 beispielsweise in die dargestellten vier parallel zu der Entlade- oder Zielstation 44 führenden Leitungen 42 geleitet und von je einem Molch 43 durch die jeweilige Leitung zu der Sendestation gefördert, wo die Teilmengen dann wieder zusammengeführt werden.To improve the dosing accuracy, it can be useful 4, the total amount of the atomizer 41 to be fed To split coating powder 45 into several portions, because the sum of the dosing errors of the subsets in some cases can be kept smaller than the error of one Total line subsidized. That from a container 40 Coming coating powder is used for this purpose in the loading or Transmitting station 46, for example, in the four shown lines leading parallel to the unloading or target station 44 42 directed and by a pig 43 through each Line conveyed to the transmitting station, where the subsets then be brought together again.

Mit einer Fig. 4 entsprechenden Anordnung ist es aber auch möglich, die Leitungen 42 (oder jeweils mehrere Leitungen) jeweils Beschichtungspulver bestimmter Farbe zuzuordnen und diese Leitungen für unterschiedliche Farben in von Flüssiglacksystemen an sich bekannter Weise an eine z.B. in der Zielstation 44 enthaltene Farbwechseleinrichtung anzuschließen.With an arrangement corresponding to FIG. 4, however, it is also possible the lines 42 (or several lines each) Assign coating powder of a certain color and these lines for different colors in liquid coating systems known way to e.g. contained in the destination station 44 Color change device to connect.

Die Leitungen 42 und Molche 43 können einem der Ausführungsbeispiele gemäß Fig. 1, Fig. 2 oder Fig. 3 entsprechen, wenn das Pulver nicht auf andere Weise auf der Stirnseite des Molches fluidisiert wird.The lines 42 and pigs 43 can be one of the exemplary embodiments 1, 2 or 3 correspond if the Do not powder on the front of the pig in any other way is fluidized.

Gemäß Fig. 5 führt eine molchbare Leitung 52 ringförmig von der Sendestation 56 zu der Zielstation 57 und von dort zurück zu der Sendestation. Durch die Leitung 52 können hintereinander mehrere Molche 53, 54 geschoben werden, die zwischen sich jeweils einen Raum mit vorbestimmten Volumen für das zu fördernde Beschichtungspulver 55 bilden. Der Zwischenraum zwischen benachbarten Molchen kann beispielsweise durch Verbindungselemente 50, 51 mit fester oder einstellbarer Länge definiert werden. Das zwischen die Molche eingefüllte Pulver 55 kann z.B. durch eine luftdurchlässige Wand der Leitung 52 fluidisiert werden.5 leads a piggable line 52 in a ring from the Transmitting station 56 to the destination station 57 and from there back to the Transmitting station. Through line 52, several can follow one another Newts 53, 54 are pushed, one between each Space with a predetermined volume for the coating powder to be conveyed 55 form. The space between neighboring ones Pigs can be connected, for example, by connecting elements 50, 51 fixed or adjustable length can be defined. The between the pig filled powder 55 can e.g. through an air permeable Wall of line 52 can be fluidized.

Mit einer derartigen Anordnung können zwischen den Molchen jeweils für einen Beschichtungsvorgang benötigte Pulvermengen gleicher oder ggf. unterschiedlicher Farbe gefördert und in der Zielstation entnommen werden, von wo die Molche durch den Rücklaufteil 52' der Leitung 52 in die Sendestation zurückgeschoben werden, um erneut definierte Pulvermengen aufnehmen zu können. Es ist auch denkbar, durch die ringförmige gemolchte Leitung 52, 52' kontinuierlich ein bestimmtes Beschichtungspulver zwischen den Sende- und Zielstationen zu fördern und ihr das Beschichtungspulver ähnlich wie der Ringleitung bekannter Flüssiglackversorgungssysteme nur bedarfsweise zu entnehmen.With such an arrangement can each between the pigs Amounts of powder required for a coating process promoted the same or different color and in the Target station are taken from where the newts through the return section 52 'of line 52 is pushed back into the transmitting station in order to be able to take up redefined quantities of powder. It is also conceivable, through the annular pigged line 52, 52 'continuously between a certain coating powder to promote the sending and target stations and her the coating powder similar to the ring line of known liquid paint supply systems can only be removed if necessary.

Claims (24)

Verfahren zur Versorgung eines Pulverbeschichtungsgerätes (1) mit dem Beschichtungspulver (4), das hierbei mit einem Fluidisierungsmedium gemischt durch eine Leitung, (2, 12, 20, 32, 42, 52) gefördert und dem Beschichtungsgerät dosiert zugeführt wird,
   dadurch gekennzeichnet, dass das Beschichtungspulver von einem Molch (3, 13, 33, 43, 53, 54) durch die Leitung gedrückt wird, wobei es auf der ihm zugewandten Seite des Molches fluidisiert wird.Method for supplying a powder coating device (1) with the coating powder (4), which is mixed with a fluidizing medium and conveyed through a line (2, 12, 20, 32, 42, 52) and metered to the coating device,
characterized in that the coating powder is pressed by a pig (3, 13, 33, 43, 53, 54) through the line, wherein it is fluidized on the side of the pig facing it. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass zum Dosieren des Beschichtungspulvers ein den Molch antreibendes Schiebemedium (5, 31) verwendet wird.A method according to claim 1, characterized in that a sliding medium (5, 31) driving the pig is used to meter the coating powder. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Fluidisierungsmedium dem Beschichtungspulver
   durch mindestens eine durch den Molch (31) in seiner Bewegungsrichtung durchgehende Öffnung (9)
   und/oder durch die für das Medium durchlässige Wand der Leitung (12) zugeführt wird.A method according to claim 1 or 2, characterized in that the fluidizing medium the coating powder
through at least one opening (9) passing through the pig (31) in its direction of movement
and / or is fed through the line (12) which is permeable to the medium. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Schiebemedium (5) des Molches (3) zum Fluidisieren mit dem Beschichtungspulver (4) vermischt wird.Method according to one of the preceding claims, characterized in that the pushing medium (5) of the pig (3) is mixed with the coating powder (4) for fluidization. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Molch (13) von einem Mitnehmermolch (37) bewegt wird, der in einer externen Leitung (36) von dem Schiebemedium (31) angetrieben wird. Method according to one of the preceding claims, characterized in that the pig (13) is moved by a driving pig (37) which is driven in an external line (36) by the pushing medium (31). Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Schiebemedium (5) des Molches (3) durch Mengen- und/oder Drucksteuerung dosiert wird.Method according to one of the preceding claims, characterized in that the pushing medium (5) of the pig (3) is metered by quantity and / or pressure control. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Schiebemedium (31) des Molches (33) von einer Dosierpumpe (35) dosiert wird.Method according to one of claims 1 to 5, characterized in that the pushing medium (31) of the pig (33) is metered by a metering pump (35). Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der das Beschichtungsgerät (41) versorgende Pulverstrom in mehrere Teilströme (45) aufgeteilt wird, die dem Beschichtungsgerät durch je eine Leitung (42) zugeführt und von je einem Molch (43) gefördert werden.Method according to one of the preceding claims, characterized in that the powder stream supplying the coating device (41) is divided into a plurality of partial streams (45) which are fed to the coating device through one line (42) each and are conveyed by one pig (43) each. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass Beschichtungspulver unterschiedlicher Farbe durch gemolchte Leitungen, die jeweils einer der Farben zugeordnet werden, einer dem Beschichtungsgerät vorgeschalteten Farbwechseleinrichtung zugeführt wird.Method according to one of the preceding claims, characterized in that coating powder of different colors is fed through pigged lines, each of which is assigned to one of the colors, to a color changing device upstream of the coating device. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Beschichtungspulver dem Beschichtungsgerät in der Leitung (52) zwischen zwei oder mehr Molchen (53, 54) zugeführt wird, die zwischen sich jeweils einen Raum mit vorbestimmten Volumen für das Beschichtungspulver (55) bilden.Method according to one of the preceding claims, characterized in that the coating powder is fed to the coating device in the line (52) between two or more pigs (53, 54) which each form a space with a predetermined volume for the coating powder (55) , Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Molch bzw. die Molche (53, 54) das Beschichtungspulver (55) von einer Sendestation (56) durch eine Zufuhrleitung (52) zu einer Zielstation (57) fördern und von dort durch eine andere Leitung (52') zu der Sendestation (56) zurückbewegt werden.Method according to one of the preceding claims, characterized in that the pig or the pigs (53, 54) convey the coating powder (55) from a transmitting station (56) through a feed line (52) to a target station (57) and from there another line (52 ') can be moved back to the transmitting station (56). Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass der Molch bzw. die Molche das Beschichtungspulver von einer Sendestation durch eine Zufuhrleitung durch eine Zielstation fördern und von dort durch die selbe Leitung zu der Sendestation zurückbewegt werden.Method according to one of claims 1 to 10, characterized in that the pig or pigs convey the coating powder from a transmitting station through a supply line through a target station and from there are moved back through the same line to the transmitting station. Versorgungssystem für ein Pulverbeschichtungsgerät (1) , das an eine Leitung (2, 12, 20, 32, 42, 52) für das mit einem Fluidisierungsmedium gemischte Beschichtungspulver (4) angeschlossen ist,
   mit einer Einrichtung zum Fluidisieren des durch die Leitung geförderten Beschichtungspulvers
   und mit einer Dosiereinrichtung (6, 35) zum Dosieren des dem Beschichtungsgerät zugeführten Beschichtungspulvers,
   dadurch gekennzeichnet, dass ein von einem Schiebemedium (5, 31) angetriebener Molch (3, 13, 33, 43, 53, 54) vorgesehen ist, der das Beschichtungspulver durch die Leitung fördert,
   und dass das Fluidisierungsmedium auf der dem Beschichtungspulver zugewandten Seite des Molches zuführbar ist.Supply system for a powder coating device (1) which is connected to a line (2, 12, 20, 32, 42, 52) for the coating powder (4) mixed with a fluidizing medium,
with a device for fluidizing the coating powder conveyed through the line
and with a dosing device (6, 35) for dosing the coating powder supplied to the coating device,
characterized in that a pig (3, 13, 33, 43, 53, 54) driven by a pushing medium (5, 31) is provided which conveys the coating powder through the line,
and that the fluidization medium can be supplied on the side of the pig facing the coating powder. Versorgungssystem nach Anspruch 13, dadurch gekennzeichnet, dass die Dosiereinrichtung (6, 35) ein Schiebemedium (5, 31) des Molches steuert.Supply system according to claim 13, characterized in that the metering device (6, 35) controls a pushing medium (5, 31) of the pig. Versorgungssystem nach Anspruch 14, dadurch gekennzeichnet, dass der Molch (3) und/oder die Leitung (12) des Beschichtungspulvers Öffnungen zum Einleiten des Fluidisierungsmediums in die Leitung (2, 12) enthalten.Supply system according to claim 14, characterized in that the pig (3) and / or the line (12) of the coating powder contain openings for introducing the fluidizing medium into the line (2, 12). Versorgungssystem nach Anspruch 15, dadurch gekennzeichnet, dass durch den Molch (3) in seiner Bewegungsrichtung mindestens eine Öffnung (9) hindurchführt, die von seinem vollständig und lückenlos an der Innenwand der Leitung (2) anliegenden Umfang radial entfernt ist. Supply system according to claim 15, characterized in that at least one opening (9) passes through the pig (3) in its direction of movement, which is radially distant from its circumference which lies completely and without gaps on the inner wall of the line (2). Versorgungssystem nach einem der Ansprüche 13 bis 16, dadurch gekennzeichnet, dass die Wand der Leitung (12) des Beschichtungspulvers (14) luftdurchlässig ist.Supply system according to one of claims 13 to 16, characterized in that the wall of the line (12) of the coating powder (14) is air-permeable. Versorgungssystem nach einem der Ansprüche 13 bis 17, dadurch gekennzeichnet, dass als Antrieb des das Beschichtungspulver fördernden Molches (33) ein mit ihm berührungslos kraftschlüssig gekuppelter Mitnehmermolch (37) vorgesehen ist, der durch eine parallel zu der Leitung (32) des Beschichtungspulvers verlegte Außenleitung (36) bewegt wird.Supply system according to one of claims 13 to 17, characterized in that the driving of the pig (33) conveying the coating powder is provided with a driver pig (37) non-positively coupled with it, which is routed through an outer line laid parallel to the line (32) of the coating powder (36) is moved. Versorgungssystem nach Anspruch 18, dadurch gekennzeichnet, dass die einen ringförmigen Mitnehmermolch (37) aufnehmende Außenleitung (36) die Leitung (32) des Beschichtungspulvers konzentrisch umschließt, und dass die Molche (33, 37) magnetisch gekuppelt sind.Supply system according to claim 18, characterized in that the outer line (36) receiving an annular driving pig (37) concentrically surrounds the line (32) of the coating powder, and in that the pigs (33, 37) are magnetically coupled. Versorgungssystem nach Anspruch 18 oder 19, dadurch gekennzeichnet, dass die den Mitnehmermolch (37) aufnehmende Außenleitung (36) eine Dosierflüssigkeit (31)enthält und an eine Dosierpumpe (35) angeschlossen ist.Supply system according to claim 18 or 19, characterized in that the outer line (36) receiving the entraining pig (37) contains a metering liquid (31) and is connected to a metering pump (35). Versorgungssystem nach einem der Ansprüche 123 bis 20, dadurch gekennzeichnet, dass die Dosiereinrichtung durch eine Ventilanordnung zum Steuern oder Regeln der Menge und/oder des Drucks des den Molch (3) antreibenden Schiebemediums (5) gebildet ist.Supply system according to one of claims 123 to 20, characterized in that the metering device is formed by a valve arrangement for controlling or regulating the quantity and / or the pressure of the pushing medium (5) driving the pig (3). Versorgungssystem nach einem der Ansprüche 13 bis 21, dadurch gekennzeichnet, dass mehrere parallel zu dem Beschichtungsgerät (41) führende Leitungen (42) für Beschichtungspulver (45) vorgesehen sind, die eingangsseitig an einen gemeinsamen Behälter (40) für das Beschichtungspulver oder an mehrere Behälter für Beschichtungspulver unterschiedlicher Farbe angeschlossen sind. Supply system according to one of claims 13 to 21, characterized in that a plurality of lines (42) for coating powder (45) leading parallel to the coating device (41) are provided, which on the input side to a common container (40) for the coating powder or to several containers are connected for coating powder of different colors. Versorgungssystem nach einem der Ansprüche 13 bis 22, dadurch gekennzeichnet, dass die Leitung (52, 52') des Beschichtungspulvers ringartig von einer Molch-Sendestation (56) zu einer auf der Seite des Beschichtungsgeräts (57) befindlichen Molch-Zielstation (57) und von dort zurück zu der Sendestation (56) verlegt ist.Supply system according to one of Claims 13 to 22, characterized in that the line (52, 52 ') of the coating powder is ring-like from a pig transmission station (56) to a pig target station (57) located on the side of the coating device (57) and from there back to the transmitting station (56). Versorgungssystem nach Anspruch 23, dadurch gekennzeichnet, dass eine Mehrzahl von Molchen (53, 54) hintereinander durch die Ringleitung (52, 52') gefördert werden, die zwischen sich jeweils einen Raum mit vorbestimmten Volumen für das Beschichtungspulver (55) bilden.Supply system according to claim 23, characterized in that a plurality of pigs (53, 54) are conveyed in succession through the ring line (52, 52 '), each forming a space with a predetermined volume for the coating powder (55).
EP03015195A 2002-07-11 2003-07-04 Process and system with pig for the supply of a powder coating apparatus Expired - Lifetime EP1380350B1 (en)

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DE10231421A1 (en) 2004-01-22
ES2229187T3 (en) 2005-04-16
US7347649B2 (en) 2008-03-25
ATE278474T1 (en) 2004-10-15
EP1380350B1 (en) 2004-10-06
US20060000933A1 (en) 2006-01-05

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