EP1245295B1 - Colour changing system for a coating device - Google Patents

Abstract

The system to change the paint, at a paint spraying station and especially for vehicle bodyworks, has an array of paint supply valves (13) for direct connection to the valve (14) of a paint sputter unit or similar paint spray. The supply valves and the paint spray valve can be moved by a drive in relation to each other in a linear path or circular movements, so that they can be coupled and uncoupled as required. The movements are set by a position control. The supply valves and/or the paint spray connection valve can be mounted to a turntable.

Description

The invention relates to a color change system for a system for Series coating of workpieces such as vehicle bodies according to the preamble of claim 1.

The color changers previously used in coating systems of this type are known to consist of a pneumatic of solenoid valves controlled valve block, each assigned to one of the selectable colors Color valve modules that are lined up at one and all Colors common color channel are connected, its output too leads to the atomizer to be supplied. Other valve modules are intended for rinsing purposes. These color changers allow one rapid changeover from one color to another during the painting process, but have several basic disadvantages. Above all, the number of colors in the Color changer and consequently on lined-up color control valves the common color line of the color change system. This fact negatively affects the consumption of color and detergent out. Another disadvantage is that for reasons of space, the atomizer-near Installation of the color changer in the painting arm of the painting machine is currently limited to 24 colors. Further increases with the number of colors also the number of solenoid valves that are complex and space-consuming, as well as the number of control lines from the solenoid valve to the color control valve, which means high expenses of installation materials, energy chains, etc. necessary are. The available space is also in the machine restricted by the control lines. Moreover, the well-known Color changers are not necessarily reliable to the extent that faulty parallel control of two color valves at the same time different colors can get into the common color channel.

The CH 531900 describes a manually operated powder spray gun for spraying different colored powders from one Gun powder channel. This powder spray gun has a Color switching device in which color changes after a color change should be reduced. The subject matter of this document is, however, only limited to powder spray guns and therefore not easily for an automated system for series coating suitable in large quantities.

US 3,240,225 deals with a device for color selection and for rinsing the painting unit. Different colors each in different hoses of a paint distribution device fed. The one in the different tubes individual colors supplied can then be rotated selected a transport channel for the disc having the color become. During the painting operation the rotatable Disc fixed in the position of the selected color become. This is done by coupling pins that are in the rotatable Axially displaceable disc for coupling and uncoupling are. These coupling pins engage accordingly during the fixing provided openings in the fixed color distributor on. The disadvantage here, however, is that the coupling pins easy to jam in the fixed color distributor and on the other hand, when engaging not always clean in the for Receiving the coupling pins provided opening in the fixed Intervene color distributor. This can lead to undesirable malfunctions come that interrupt the entire painting process and therefore more expensive.

From US-A-3674207 is a color change system for a system for the serial coating of vehicle bodies known with a Arrangement of several connected to a paint supply line Paint supply valves for coating material with selectable different colors to which a connecting link connects an atomizer can be connected. The link is by means of a drive device to the supply valve for the selected color in a given direction of movement can be coupled and separated from it. The paint supply valves are in a direction transverse to the clutch movement direction lying level opposite the connecting link arranged, and with a position control device that is Link transverse to the direction of clutch movement in a Movable position in which the link with each selected ink supply valve is aligned.

The invention has for its object a color change system indicate the disadvantages of known color changers avoids and with practically any number selectable colors one to the lowest possible, from the number of colors independent length enables shortened common color range.

This object is solved by the features of the claims.

The invention is based on the basic principle of coupling and uncoupling Media couplings to implement a desired color change, by an atomizer-side coupling part by a as a position control device serving handling aid with a respective Coupling part of the paint supply system of a very specific one Color is connected. By using the drive device is the connection valve and / or the paint supply valves Movable in the coupling direction so that there are no malfunctions causing coupling pins more necessary, which in addition to a trouble-free Operation all the mechanics of the Color change system is simplified.

The invention results in particular with an increasing number of colors a drastic shortening of the common paint line in the color changer, the length of which is independent of the number of colors is. One consequence is savings in color and detergent. Furthermore, the previously required solenoid valves for actuation by color valves, which means that the investment, Installation and assembly work is reduced and space is also saved is achieved. With the solenoid valves, too associated control air lines for each individual color valve well-known: color changers and their space requirements.

According to a special feature of the invention, the color change system especially piggable when using ball valves. To the Pressing the respective ball valves of the individual colors can only common drive can be provided, which according to the Media coupling of the color change system is handled.

Another advantage is the avoidance of parallel control of color valves, since only one connection to the common one Color line section can exist. Furthermore, in Comparison with the known color changers savings on installation material as well as assembly and commissioning effort. All in all fewer components are required, especially with a large number of colors. Depending on the application, the color change system can be very compact can be realized with optimal hose routing, which is above all is important when installing in spatially limited painting arms.

In preferred embodiments of the invention, the media couplings shut off on one or both sides, whereby at known shut-off devices can be used. For the media couplings of the paint supply system can act as shut-off devices for example check valves, needle valves or ball valves be used. The media coupling, especially that of the atomizer Color change system can function valves in addition to the color valve for example for dilution, pulsed air and recycling contain. Furthermore, the media coupling of the atomizer side Color change system, for example formed by a plunger Device for opening the media couplings of the paint supply system contain.

If the media couplings of the paint supply system and / or the have a ball valve on the atomizer-side color change system, whereby the color changer when the ball valves are in the open switch position is piggable, the actuator can open the ball valves useful for the media coupling of the atomizer-side color change system are located.

The handling aid for merging the media couplings can be an electric actuator for movements in a Cartesian Have coordinate system, the x, y and z axes of the possible Define directions of movement. The axis movements are in this case linear and can, for example, be along longitudinal rails respectively. The positioning of the respective media coupling the paint supply system and / or the media coupling of the atomizer-side color change system is here by the x and y-directions adopted. The axes must be connected before coupling of the media couplings to be connected to one another so that they are in line. The movement In contrast, the media couplings can be used in the z direction the paint supply system and the atomizer side To couple the color change system together. In certain applications it is also possible to guide on an x / y axis to do without and only a linear positioning (linear guide) make.

Instead of an x and y guide for positioning and alignment a turntable can also be used for the media coupling in question become. In this case too, the coupling movement can be in the z direction done, but is also a different direction relative to Rotation possible. By an additional linear movement of the media coupling on the atomizer side also creates the possibility of the circular arrangement of the media couplings of the Color supply system to run in two rows.

Instead of an electric drive for the x- / y-positioning can a pneumatic drive can also be selected. In this case there is the special way to reduce the number of Valve functions and a linear guide to reduce the installation space with binary-coded lifting movements.

The rotary table mentioned above can also be used instead of an electric drive are pneumatically driven. In this case too a binary coded turntable can be used.

For positioning there is the option of the media coupling of the atomizer-side color change system and / or the media couplings of the paint supply system. In many cases the handling of the paint supply despite a possibly larger one mechanical effort to be preferred, since this variant Avoid loss of color changes in the color change system almost completely to let.

Thanks to the pigging technique mentioned, it is possible to use the separating body serving the coating material through the paint hoses to promote. Because also by extending the piggable If the color losses do not increase, they can be of any length Hoses between the atomizer-side color change system where there is a pig station, until the end of the pig line be installed, at which there is a second pig station. at In such a system, the color changer can be appropriately far from Atomizer in an easily accessible place, for example in one Paint cabinet, can be assembled.

If the pig is used, the one in the hose line any remaining paint after a coating process back in to press the paint supply, it may be useful to directly on Color output of the atomizer-side color changer after a color pressure regulator to place a dosing pump. Should not be a dosing pump can be used to avoid loss of color in this System part make sense, when changing colors the atomizer side Color change system with color pressure controller to handle. But if a dosing pump directly to the atomizer-side system part is connected downstream, it is to avoid loss of color required, either the entire paint supply part or the media coupling of the atomizer-side color change system with color pressure regulator and dosing pump.

The newt can also be used to make the coating material from the common paint line towards the atomizer to press. In this case the dosing pump is close to the atomizer, that is, at an appropriate distance from the color change system.

The invention is explained in more detail with reference to the drawing.

Fign. 1A, 1B

eine Prinzipskizze des erfindungsgemäßen Farbwechselsystems;

Fig. 2

eine perspektivische Ansicht einer ersten Ausführungsform des Farbwechselsystems;

Fig.3

eine perspektivische Ansicht einer zweiten Ausführungsform des Farbwechselsystems;

Fign. 4A, 4B

eine schematische Darstellung einer x-, y- und z-Führung des zerstäuberseitigen Farbwechselsystems;

Fig. 5

eine schematische Darstellung einer Medienkupplung;

Fig. 6

eine schematische Darstellung eines molchbaren Farbwechsler;

Fig. 7

eine Prinzipskizze zur Handhabung der Medienkupplungen des Farbversorgungssystems;

Fig. 8

eine Prinzipskizze zur Handhabung der angebauten Ventilfunktionen für Anlagen und Verfahren mit einem lösbaren Zerstäuber;

Fig. 9

eine dritte Ausführungsform eines Farbwechslers;

Fig. 10

eine vierte Ausführungsform eines Farbwechslers;

Fign. 11 - 13

einen pneumatischen Linearantrieb mit binärer Codierung.

Show in detail:

FIGS. 1A, 1B

a schematic diagram of the color change system according to the invention;

Fig. 2

a perspective view of a first embodiment of the color changing system;

Figure 3

a perspective view of a second embodiment of the color change system;

FIGS. 4A, 4B

a schematic representation of an x, y and z guide of the atomizer-side color change system;

Fig. 5

a schematic representation of a media coupling;

Fig. 6

a schematic representation of a piggable color changer;

Fig. 7

a schematic diagram for handling the media couplings of the paint supply system;

Fig. 8

a schematic diagram for handling the attached valve functions for systems and processes with a detachable atomizer;

Fig. 9

a third embodiment of a color changer;

Fig. 10

a fourth embodiment of a color changer;

FIGS. 11-13

a pneumatic linear actuator with binary coding.

1A schematically shows a color change system 10 in which a Ink supply unit 11 uncoupled from a color changing unit 12 is shown. The ink supply unit 11 has ink supply valves 13 and the color changing unit 12 a connection valve 14 on. The valves 13 and 14 can be used as check valves, Needle valves, ball valves or the like may be formed. The Valves 13 and 14 can 15 media couplings at their junctions have, whereby the valves 13 and 14 are engaged State (see Fig. 1B) can be connected. The paint supply valves 13 lie in a direction transverse to the coupling direction level opposite the connection valve 14. Arrows 16 indicate the minimum degrees of freedom required shown for the movement of the media couplings 15. If the arrows 16 lying in the plane of the drawing are the x and z directions of a Cartesian coordinate system a further degree of freedom in the y direction perpendicular to it is possible his.

1B shows the ink supply unit in the coupled state with the color changing unit. It is now the middle of the three illustrated ink supply valves 13 by means of the media couplings 15 coupled together with the connecting valve 14. To the flow of the coating material to open in coupled state, the middle paint supply valve 13 and the connection valve 14. The other two paint supply valves 13 are closed to prevent undesirable leakage of coating material to avoid.

2 shows a perspective view of a first embodiment a color change system 20, wherein a color change unit 21 movable along the Cartesian x, y, z coordinate system is. A color supply unit 22 preferably shows as Check valves executed ink supply valves 23, the connected to a hose 24 supplying the coating material are. The paint supply valves 23 can be here movable table, not shown, which along the x-, y-, z coordinate system is movable, be arranged. You can the ink supply valves 23 either in the one shown here Arrangement or in other appropriate arrangements be grouped. The color changing unit 21 has different ones Valve functions and a plunger for uncoupling the paint supply unit 22 from the color changing unit 21.

3 shows a color change system 30 in which a color change unit 31 compared to an ink supply unit designed as a rotary table 32 lies opposite. The ink supply unit 32 has check valves 33, which with the coating material promotional hoses 34 are connected. The trained as a turntable Color changing unit 32 naturally has very compact dimensions and is therefore for installation in a painting arm of a painting machine or a painting robot particularly well suited. The rotary drive of the ink supply unit 32 can be both electrical be pneumatic as well. If the paint supply valves 33 as shown arranged on two circles concentric to each other can be used to couple the ink supply unit 32 with the color changing unit 31 an additional linear drive is required with which the color changing unit 31 in addition to the movement performs a movement in the x / y plane in the z direction. So is then a change between those in the two concentric circles arranged ink supply valves possible, as well as a movement the color changing unit 31 in the z direction; around the color changing unit 31 and to couple the ink supply unit 32 into one another and disengage from each other.

4A shows a color changing unit 40, which is equipped with a color supply unit 41 connected by means of coupling halves 42 and 43 can be. A drive 45 moves the color change unit 40 in y direction and a drive 44 or 49 (Fig. 4B) moves the color changing unit 40 in the x direction. A pneumatic cylinder 46 moves the color changing unit 40 in the z direction. For coupling the color changing unit 40 with the ink supply unit 41, the central axis of the Coupling half 43 with the central axis of each to be coupled Coupling half 42 aligned, that is, the coupling half 43 must be exactly in the x and y direction the coupling half 42 to be coupled. A color pressure regulator 401 takes care of the during the coating process correct color printing.

4B shows the color change unit 40 as a sectional illustration along the section line A-A of Fig. 4A. The color changing unit 40 is moved on guides 47 and 48 in the x and y directions. The drive 45 moves the color change unit 40 in the y direction and the drive 49 moves the color changing unit 40 in the x direction. The pneumatic cylinder 46 moves the color changing unit 40 in the z direction to the color changing unit 40 with the color supply unit 41 connect them from the ink supply unit 41 separate.

5 shows a media coupling 50 (see item 15 in FIG. 1). The Media coupling 50 has the coupling half 51, that of the ink supply side is assigned to and the coupling half 52, the is assigned to the color change page. The coating material is promoted in the direction of arrow 53. The coupling half 51 has a check valve 54 which in the uncoupled Condition is to prevent color from undesirably entering the environment can reach. With a lock 55, the check valve locked and unlocked. A cylinder 56 is generated the movement for coupling and uncoupling the coupling halves 51 and 52. A cylinder 57 acts when connecting the two coupling halves 51 and 52 on a plunger 58, the check valve 54th opens. When separating the two coupling halves 51 and 52 in one Partition plane 59 is the check valve 54 by moving back of the plunger 58 and closed again by means of a spring 501. On Needle valve 502 stands for functions such as feed, shut-off and Regulation of paint, thinner, pulse air or the like for Available. Other than shown here, the cylinder 56, the serves to dock the two coupling halves 51 and 52 instead arranged on the color change side also on the ink supply side his.

Fig. 6 shows a piggable color changer 60, the two along a separating plane 61 has separable halves 62 and 63. The coating material is promoted in the direction of arrow 64. The piggable color changer 60 has a unit 66 which a hose 67, a screw connection 68 and a ball valve 65 contains. By means of a self-locking transmission member 69 and a drive 601, the ball valve 65 can be opened and closed become. The actuator 601 can be pneumatic as well be operated electrically. If necessary, for each color on the respective Ball valve 65 has its own actuator. Depending on Use case and process technology, it may be appropriate to certain Functions such as flushing, returning, locking the pig etc. via reusable ball valves or not shown here Realize valves. It is also conceivable that the atomizer side Shut off coupling half 63 by means of a ball valve. A cylinder 602 is used to connect and disconnect the two coupling halves 62 and 63. The piggable color changer 60 is for example to be preferred for special color coatings where Pigging technology the entire paint content from a paint bucket or the like to be promoted to the atomizer.

FIG. 7 shows a schematic diagram of the media coupling from FIG. 5 detailed explanation of a color change cycle. media couplings 70 are shut off or opened via check valves 71. A Media coupling 72 on the atomizer side is with a valve 73 connected, the functions of dilution and pulse air for purging the common paint line can run. A valve 74 takes over the function for color that during the color change is not needed. The media coupling 72 of the atomizer side Color change system contains one not shown here Tappet for opening the check valve 71 of the respective media coupling 70 of the ink supply system. As a handling device becomes an electrically driven, not shown here Linear guide for the x-direction and also not closer here shown pneumatically driven linear guide for the z-direction used.

Painting with the first color: the axes of the media coupling 70 of the ink supply system F1 and the media coupling 72 of the atomizer side Color change systems are aligned in the x direction. A cylinder Z2 is extended, with which the two coupling halves 70 and 72 are engaged. A plunger Z1 is also extended, which opens the check valve. By the opened valve 71 for color F, the first color reaches the common Color line section to the adjacent application devices like color pressure regulators, dosing pumps and atomizers, which are not here are shown.

Start of the color change program: With an upcoming color change the system control turns an automatic rinsing and pressing program started.

Rinsing: The rinsing is carried out in that of conventional color changers performed in a manner known per se. The plunger Z1 retracted, whereby the check valve 71 is closed. Thereby the flow of the first color F1 is blocked. When rinsing the valve 71 is open for this color. The valves 73 for Dilution and pulse air are opened alternately. The common color path from the color changer to the atomizer. The interface is automatically rinsed.

Handling: After the rinsing process, all valves 71 go into their Initial state, and the cylinder Z2 retracts, whereby the two coupling halves are separated. Now through the Linear guide with electric drive the axis of the atomizer side Move media coupling 72 in the x direction until it is with the axis of the media coupling 70, for example of the ink supply system F3 is aligned. Then drive one after the other cylinders Z2 and Z1, whereby the two coupling halves 70 and 72 are engaged and the next color F3 in the common Color line segment arrives. After pressing in the atomizer run the same processes as when painting with the first Color off.

8 shows a schematic diagram of a paint supply unit 80 and an atomizer-side color changing unit 81. Between the Ink supply unit 80 and the color changing unit 81 is located a washing and loading unit 82. The washing and loading unit 82 is by means of couplings 83 to the ink supply unit 80 and the color changing unit 81 can be coupled. Hence it is in the atomizer-side color changing unit 81 by a detachable one Unit, so that the system in a so-called atomizer exchange operation can be driven. The rinsing and loading unit 82 assigns valves 84 for the dilution and pulsed air functions Rinse the common paint line. It also points a valve 85 for the color function, this function is not needed during a color change.

9A shows an atomizer changing device 90 with atomizers 92 and 93, which are rotatable about an axis 91. The atomizers 92 and 93 can be flushed by means of a flushing coupling 94 and by means of an ink sampling point 95, which have a check valve can be loaded with paint.

9B shows the atomizer changing device 90 from above. The Atomizer changing device 90 is, for example, for special colors particularly suitable. The atomizers 92 and 93 can besides the Atomization function also the function of color storage and the Color dosing included and after each painting process by the Exchange device 90 are handled. Not shown here Dosing device can be arranged directly in front of the atomizing device be, which means that when changing colors only very short color line sections must be emptied and rinsed. Besides, is by placing the atomizer changing device outside the painting arm can store an infinite number of colors. Since the atomizer changing device 90 is suitable anyway Handling devices available for handling the atomizer are the atomizer changing device shown here 90 with media couplings without problems.

10 shows an embodiment of a color change system 100, in the two separately with the paint supply system, not shown here detachable, each connected to an atomizer 100 or 102 Media couplings A and B are provided. Et al for faster Color change can be, for example, for the atomizer 101 Color changes are performed while the other atomizer 102 works in the coating shop. Simultaneous color change for both atomizers 101 and 102 are also possible.

Since only one color strand is painted with a specific color, a shut-off device, not shown here, is sufficient, for example one check valve per color. The respective color strand (A or B) a linear guide 103 or 104 is assigned to each. It is also possible to use a linear guide with a gripper to move the respective media coupling, creating a linear unit can be omitted.

Instead of the linear arrangement of the ink supply valves shown F1-F8 is also a circular arrangement with radial movements possible.

11-13 is used for the color change system described here suitable pneumatic linear actuator with binary coding explained.

Signals coming from the higher-level control of the coating system (A, B, ..N) are each assigned to a cylinder ZA, ZB, ... ZN. The series connection of the cylinders ensures that the input signals of the cylinders are binary coded in the dual code. By decoding it is possible to obtain 2 ⁿ switching positions, i.e. output signals, from n input signals, i.e. n cylinders (for n = 0, 1, 2 ...). The decoding system for, for example, n = 3 input signals in 2 ⁿ = 8 output signals can be found in the table in FIG. 11.

This logic can be continued as desired. So it is possible for example with six control signals (A, B, C, D, E, F) as Input signal 64 output signals for traversing the individual Get switching points. A pneumatic linear actuator with a such binary coding is shown in FIG.

The division of the individual stroke lengths 1 is intended, for example, a total distance S 8 have the same switching points, so the individual cylinders is carried out according to Fig. 12. The stroke can be determined by L _k = S ⁿ 2 with n = 0,, 2, ... and k = 1, 2, 3, ... calculate.

S₁, S₂, S: Abstand der einzelnen Schaltpunkte

S_ges: Gesamte Strecke

N: Anzahl an einzelnen Schaltpunkte

n: Variable für Zylinder

L₁, L₂. L_k: Einzelhub der jeweiligen Zylinder

L_ges: Gesamthub

k: Variable für Hub

S_ges = L_ges

The following applies:

S ₁ , S ₂ , S: distance between the individual switching points

S _tot : total distance

N: number of individual switching points

n: variable for cylinder

L ₁ , L ₂ . L _k : single stroke of the respective cylinders

L _tot : total stroke

k: Variable for stroke

S _tot = L _tot

One way to optimize this arrangement in terms of Overall length is that you can connect cylinders in series Arrange in parallel as needed. A corresponding pneumatic Linear drive with binary coding in short design is shown in Fig. 13 shown.

For cheaper designs, the use of one another is also inserted hollow shaft cylinders conceivable.

The arrangement shown here as a linear unit can be divided into one according to the same principle via linked rotary drives in one radial or circular unit can be modified, with certain Switching points are scanned on the circumference.

Claims (18)

1. A paint changing system for an installation for the serial coating of workpieces including an arrangement of a plurality of paint supply valves (13, 23, 33), connected to respective paint supply lines, for coating material with selectively different paints, to which at least one atomiser of the coating installation is connectable via at least one connecting valve (14), characterised in that a drive device (46) is provided, with which the connecting valve (14) and the supply valve (13, 23, 33) for the selected paint are movable in a predetermined direction of movement relative to one another and may thus be coupled together and separated from one another, that the paint supply valves (13, 23, 33) are arranged opposite to the connecting valve (14) in a plane situated transversely to the direction of coupling movement, and that a position controller is provided, with which the paint supply valves (13, 23, 33) and/or the connecting valve (14) are movable in two different directions transversely to the direction of coupling movement into a position in which the connecting valve (14) is aligned with the selected paint supply valve (13, 23, 33).
2. A paint changing system as claimed in Claim 1, characterised in that the position controller includes a linear drive, with which the paint supply valve arrangement (13, 23, 33) and/or the connecting valve (14) are movable in a direction x or in two directions x, y perpendicular to one another and situated in the same plane.
3. A paint changing system as claimed in Claim 1, characterised in that the paint supply valve arrangement (13, 23, 33) and/or the connecting valve (14) are arranged on a rotary table or a rotatably mounted carrier.
4. A paint changing system as claimed in Claim 3, characterised in that the connecting valve (14) is also linearly movable.
5. A paint changing system as claimed in Claim 3 or 4, characterised in that the rotary table may be driven electrically or pneumatically.
6. A paint changing system as claimed in one of Claims 1 to 5, characterised in that the paint supply valves (13, 23, 33) and the connecting valve (14) have medium couplings (15, 42, 43) at their connection points.
7. A paint changing system as claimed in Claim 6, characterised in that the medium couplings (15, 42, 43) may be shut off on one side or on both sides.
8. A paint changing system as claimed in Claim 6 or 7, characterised in that the medium couplings (15, 42, 43) also include functional valves (73, 74) in addition to the paint valves (84, 85).
9. A paint changing system as claimed in one of Claims 6 to 8, characterised in that the medium couplings (15, 42, 43) include an opening device, for instance in the form of a push-rod (58).
10. A paint changing system as claimed in one of Claims 6 to 9, characterised in that the medium couplings (15, 42, 43) are connected to a ball valve (65).
11. A paint changing system as claimed in one of Claims 6 to 10, characterised in that the handling aid for the moving together of the medium couplings (15, 42, 43) includes an electrical drive (45, 49) or a pneumatic drive (44) for movements in a spatial, Cartesian coordinate system.
12. A paint changing system as claimed in Claim 11, characterised in that the x-/y- positioning is effected by means of a pneumatic drive.
13. A paint changing system as claimed in one of Claims 6 to 12, characterised in that the paint supply valves (13, 23, 33) and/or the connecting valve (14) are positionable.
14. A paint changing system as claimed in Claim 13, characterised in that it includes ball valves (65).
15. A paint changing system as claimed in one of Claims 1 to 14, characterised in that it includes at least one pig station.
16. A paint changing system as claimed in Claim 15, characterised in that the paint changer (12, 21, 31) is arranged remote from the atomiser.
17. A paint changing system as claimed in one of Claims 1 to 16, characterised in that a metering pump is positioned after a paint pressure regulator (401) at the paint outlet of the paint changer (12, 21, 31) on the atomiser side.
18. A paint changing system as claimed in one of Claims 1 to 16, characterised in that the metering pump is arranged in the vicinity of the atomiser.

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