EP2089164A2

EP2089164A2 - Universal atomizer, and associated operating method

Info

Publication number: EP2089164A2
Application number: EP07819602A
Authority: EP
Inventors: Frank Herre
Original assignee: Duerr Systems AG
Current assignee: Duerr Systems AG
Priority date: 2006-11-15
Filing date: 2007-11-05
Publication date: 2009-08-19
Anticipated expiration: 2027-11-05
Also published as: EP2089164B1; RU2450868C2; CN101557881A; US20100133353A1; US9346070B2; EP2089164B2; JP5502489B2; ES2681718T5; DE102006053921B4; WO2008058650A3; DE102006053921A1; JP2010509059A; CN101557881B; WO2008058650A2; ES2681718T3; RU2009122497A

Abstract

The invention relates to an atomizer (1), particularly a rotary atomizer, comprising a first paint inlet (3) for a first paint system, e.g. a solvent-based paint. The atomizer (1) according to the invention further comprises an additional second paint inlet (4) for a second paint system, e.g. a water-based paint. The two paint inlets (3, 4) are separated from one another such that the atomizer (1; 28) can alternatively apply one of the two different paint systems. The invention also relates to a corresponding operating method.

Description

DESCRIPTION

Universal atomizer and associated operating method

The invention relates to an atomizer, in particular a rotary atomizer, and a corresponding operating method according to the independent claims.

In paint systems for painting automobile body parts, various paint systems are used as wet paints, namely solvent paints and water-based paints that are more environmentally friendly. The application of the various paint systems takes place here by atomizers, which may be designed for example as a rotary atomizer and in addition to a paint line for supplying the wet paint with the desired color also have a purge line to rinse the atomizer during breaks in operation or a color change with a detergent , wherein the rinsing agent is adapted to the paint system used in each case. Occasionally, such atomizers are also used for the application of different coating systems (water-based paint and solvent-based lacquer), which, however, is associated with an increased flushing effort when changing between the different lacquer systems (increased

Consumption of detergent and time, so that the pitch changes, which makes the logistics more complex), since in the case of direct contact between the different coating systems, chemical reactions can occur which lead to hardening and thereby irreversibly damage the atomizer. For example, there is a risk of coagulation in a Lacksystemwechsel because some paints are incompatible, ie they can contaminate the shared area and damage in the worst case. The curing is rather a special case and forms the so-called "worst case". Faults in the paint shop are due to the reaction of incompatible systems with each other safely. Mechanical cleaning may be required subsequently. This is not possible in all color-leading areas. As a result, this method is unsuitable for mass production due to the cost of production loss. When switching between different paint systems, therefore, a third rinse is often required to prevent the disruptive chemical reaction between the different paint systems.

DE 35 34 269 A1 discloses a painting device in which two spray guns are each supplied with the paint to be applied via a single paint feed (paint line). When switching between different paint systems (for example water-based paint / solvent-based paint), complicated rinsing processes are therefore required.

Also in the case of the coating devices according to WO 2005/044466 A2, DE 10 2004 038 017 A1 and DE 198 60 087 A1, the application device has only a single paint supply, which requires complicated rinsing processes when changing between different paint systems (eg water-based paint / solvent-based paint) power.

From DE 103 58 646 Al a valve assembly is also known, which is used for mixing the various components (eg stock paint / hardener) of a multi-component paint. However, due to its design, this known valve arrangement is not suitable for supplying different paint systems (eg water-based paint / solvent-based paint). Furthermore, the state of the art should be pointed to SVEJDA, Pavel: "Flexibility is Trump", Carl Hanser Verlag Munich, MO year 54 (2000) 10, pages 44 ff., DE 41 05 116 Al, DE 103 42 643 Al and DE 101 57 966 Al.

The invention is therefore based on the object to improve the known atomizer described above accordingly and to specify an associated operating method.

This object is achieved by an atomizer according to the invention or a corresponding operating method according to the independent claims.

The invention comprises the general technical teaching of providing separate paint feeds for the different paint systems in the atomizer, so that the atomizer can be operated alternately with the different paint systems.

The differentiation used between different paint systems used in the invention preferably distinguishes solvent-based coatings on the one hand and water-based paints on the other side, the two paint systems can be supplied in different colors. Different-colored water-based paints thus belong within the meaning of the invention to the same paint system, as well as solvent-based paints with different colors are assigned to the same paint system. The term used in the context of a coating system thus includes all components of the respective coatings, such as solvents, binders, additives, dyes, and fillers. In the context of the invention, the various coating systems can therefore, for example, as in the above-mentioned, differ in the solvent used, the one solvent system essentially being the solvent. may contain water, while the other paint system may contain an organic solvent.

In addition, the various paint systems in the context of the invention can also be used for the application of different paint layers. For example, a primer may be applied with a water-based paint, followed by a waterborne basecoat and then a solvent-borne clearcoat.

In one embodiment of the invention, the various paint feeders for the individual paint systems each have separate main needle valves which supply a common application element (for example a bell cup) with the various paint systems.

The term of an application element used in the context of the invention preferably refers to rotating bell disks which are known per se and therefore need not be described in any more detail. However, the invention is not limited to bell plates with regard to the application element to be used, but rather includes as application elements, for example, the discs commonly used in disc atomizers, baffle plates, air atomizers and the like.

In the abovementioned embodiment with separate main needle valves for the different paint feeds, separate main needle monitoring devices are preferably provided in order to independently monitor and / or adjust the valve position of the individual main needle valves. In another embodiment of the invention, however, a common main needle valve is provided for the different paint feeds. In this case, the individual paint feeds for the different paint systems are thus combined in the atomizer and then open into the common main needle valve, which is arranged upstream of the application element (eg a bell cup).

In this exemplary embodiment with a common main needle valve, a respective shut-off valve is preferably arranged upstream of the common main needle valve upstream of the common main needle valve, so that the individual paint feeders can be shut off independently of each other. This is important to prevent a chemical reaction between the different paint systems when switching between chemically incompatible paint systems (e.g., water-based paint and solvent-based paint).

In addition, the nebulizer according to the invention preferably has separate return lines for the individual paint feeds, which enables rapid rinsing with large rinsing agent flows or volumes in each paint feed. When rinsing on the bell plate, the possible detergent flows are limited because the bell cup could be flooded. Furthermore, everything must be in the cabin or leaching

"discarded" material can be filtered out of the leaching again. Returns, on the other hand, are usually connected directly to corresponding collection containers, which considerably simplifies disposal. In addition, the return lines allow a permanent circulation of the respective paint system. Another important point for the use of returns for the different areas is the time savings through at least partially parallel processes, such as eg rinsing between color changer and atomizer (depending on the type of charge and varnish).

Preferably, these return lines within the nebulizer are completely separated from each other outside the nebulizer to prevent a chemical reaction between incompatible coating systems. However, when chemically compatible coating systems are used, there is also the possibility that the individual return lines for the various paint systems flow downstream into a common return line.

The atomizer according to the invention may further comprise an electrostatic charge for the applied wet paint. In this case, either external charging and / or direct charging can be used, which is known per se from the prior art. The atomiser according to the invention can therefore have at least one outer electrode for electrostatic external charging of the applied lacquer systems and / or at least one contact electrode for electrostatic direct charging of the applied lacquer systems.

In addition, a combination charging is possible within the scope of the invention, wherein both a direct charging and an external charging takes place. Such a combination charge is described, for example, in patent application DE 41 05 116 A1, so that the content of this patent application is to be fully attributed to the present description. For example, the paint systems water-based paint and solvent-based paint can be charged by means of direct charging. Alternatively, it is within the scope of the invention, the possibility that water-based paint is charged only by means of external charging, whereas solvent-based paint is charged by means of combination charging. Furthermore, there is the possibility that the external charging is electrically grounded in an application of solvent-based lacquer, to prevent ignition of the solvent-based paint by flying sparks. Furthermore, the external charging with the associated electrodes can be temporarily removed and deposited by the atomizer during an application of solvent-based lacquer, which is described, for example, in patent application EP 1 634 651 A1, so that its content can be fully attributed to the present description.

In addition, the atomizer according to the invention preferably has separate flushing lines for the individual paint systems in order to be able to supply in each case chemically compatible flushing agents which are adapted to the respective paint system.

In this case, each of the paint feeds is preferably assigned a rinsing pipe in each case in order to be able to feed the respectively suitable rinsing agent for the respective paint system (water-based paint or solvent-based varnish).

In one embodiment of the invention, an additional additional purge line is additionally provided in order to avoid a chemical reaction between the different coating systems when changing between the different coating systems. The additional rinsing agent must therefore be chemically compatible with the various paint systems and the associated rinsing agents and act as a kind of buffer.

In this exemplary embodiment, therefore, the number of different rinsing agents and thus, as a rule, the number of rinsing lines is greater than the number of different varnish systems or varnish feeders. For example, the number of different rinsing agents or flushing lines can be greater by one than the number of different paint systems or paint feeders. In a variant of the invention, the purge lines in the atomizer open into a line section downstream of the common main needle valve or downstream of the individual main needle valves. This arrangement of the flushing lines is particularly suitable for brief flushing of the application element in order to clean the application element.

However, there is also the possibility that the purge lines in the atomizer open into a line section which lies upstream of the common main needle valve or in front of the separate main needle valves. This arrangement of the purge line advantageously also allows flushing of the main needle valve or the main needle valves.

In a combination of these two variants, at least one of the short flush purge lines in the atomizer may open into a conduit section downstream of the common main needle valve and behind the separated main needle valves, respectively, while at least one of the purge lines in the atomizer opens into a conduit section upstream lies in front of the common main needle valve or before the separate main needle valves. For brief rinsing, rinsing agent is then supplied via the rinsing line which opens downstream behind the main needle valve or valves, while the rinsing line, which opens in front of the main needle valve or in front of the main needle valves, is used for the normal rinsing operations.

In a further embodiment of the invention, the atomizer has two main needle valves, via which in each case a coating system (eg water-based paint or solvent-based lacquer) can be supplied. In this embodiment, however, only a single purge line is provided, which in a Leitungsab- downstream downstream of the two main needle valves opens.

The invention comprises not only the atomizer described above as a single component, but also a complete painting machine with such an atomizer, wherein the coating machine can be configured, for example, as a multi-axis painting robot, side machine or as a roofing machine. However, the invention is not limited in the machine type to painting robots, roofing machines or side machines, but also includes other types of machines that are well known in the art.

The rinsing of the atomizer with rinsing agents for the different paint systems can in this case be carried out by a plurality of internal rinse lines, which run in the atomizer, as already described above.

However, it is alternatively also possible that only a single internal flushing line is arranged in the atomiser, which is supplied with a different flushing means for the individual lacquer systems by a flushing valve arrangement arranged outside the atomizer and a plurality of external flushing lines.

In a preferred embodiment of the invention, the nebulizer has two internal purge lines, one of the two internal purge lines for short rinsing and therefore opens in the nebulizer in a line section downstream of the main needle valve, while the other internal purge line in a line section upstream of the Main needle valve opens. The two internal purge lines into the atomizer are replaced by the purge valve arrangement of several (eg three) external flushing lines supplied with different rinsing agents for the individual paint systems. In general, there is therefore the possibility that the number of external purge lines is greater than the number of internal purge lines, the purge valve arrangement optionally connecting the external purge lines to the internal purge lines.

In a painting robot with a plurality of robot arms, the external flushing valve arrangement can be arranged, for example, on the so-called "arm 1" or on the so-called "arm 2" of the painting robot. However, the invention is not limited to the above examples in terms of the spatial arrangement of the Spülventilanordnung, but also in other ways feasible.

Furthermore, the coating machine according to the invention preferably has separate supply lines for the different paint systems.

The individual supply lines for the different paint systems can each have a color changer to allow a color change in each supply strand.

In addition, the metering of the different coating systems can be carried out in each case by separate metering pumps, which are arranged in the individual supply lines.

Preferably, the painting machine according to the invention is designed as a multi-axis painting robot and has a first robot arm ("arm 1") and a second robot arm ("arm 2"), wherein the second robot arm is movably attached to the first robot arm and directly a robot hand axis with an application device (eg a rotation duster). For example, the two metering pumps for the different paint systems can both be mounted on or in the first robot arm ("arm 1.") Alternatively, within the scope of the invention, the possibility exists that the individual metering pumps for the different paint systems on or in the second robot arm ("Arm 2") are attached. It is also possible that one of the metering pumps is attached to or in the first robot arm, while the other of the two metering pumps is attached to the second robot arm.

For example, the painting machine according to the invention can have a travel axis with a carriage which can be moved on a rail, wherein the carriage carries, for example, a painting robot. The metering pumps can hereby be wholly or partly arranged on the carriage.

Furthermore, it is within the scope of the invention, the possibility that the individual metering pumps are fully or partially integrated into the atomizer.

However, the invention is not limited to the examples described above with regard to the spatial arrangement of the metering pumps, but can also be realized in another way.

Furthermore, the invention comprises a painting booth with a painting machine according to the invention and a cabin wall, which spatially limits the painting booth. The metering pumps for the individual paint systems can hereby be arranged completely or partially on the cabin wall, either inside the paint booth or outside the paint booth. Finally, the invention also includes an atomizer operating method to enable universal operation with various paint systems.

Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiments of the invention with reference to FIGS. Show it:

1 shows a schematic representation of a rotary atomizer according to the invention with several paint feeders for different paint systems and separate main needle valves for the individual paint systems,

FIG. 2 shows a modification of the exemplary embodiment according to FIG. 1 with a common main needle valve for the different paint feeds;

Figure 3 shows a modification of the embodiment of Figure 1 with three paint feeds, three flushing lines to

Quick rinse and three normal rinse lines,

FIG. 4 shows a further embodiment of an atomizer according to the invention with two internal purge lines in the atomizer and three external purge lines outside the atomizer, wherein the external purge lines feed the internal purge lines in the atomizer via a purge valve arrangement;

Figure 5 is a perspective view of painting robots according to the invention, as well

FIG. 6 shows a modification of the exemplary embodiment according to FIG. 1. Figure 1 shows a partially conventionally constructed rotary atomizer 1 with a rotatably mounted bell cup 2, wherein the rotary atomizer 1 serves both for the application of a solvent-based paint as well as for the application of a water-based paint.

The water-based paint is in this case fed via a paint feed 3, whereas the solvent-based paint is supplied via a separate paint feed 4 in the rotary atomizer 1.

Of the two paint feeds 3, 4 for the water-based or solvent-based paint branches off in each case a return line 5 or 6, so that the two paint systems in the paint feeds 3, 4 can permanently circulate.

It is important here that the paint feed 3 and the associated return line 5 on the one hand and the other paint feed 4 and the associated return line 6 on the other hand are separated from one another in order to establish contact between the various

Paint systems (solvent-based paint and water-based paint) to prevent. This is important because contact between the different paint systems would lead to a chemical reaction and thus irreversible damage to the rotary atomizer 1.

In addition, in each case a shut-off valve RFA or RFB is arranged in the two return lines 5, 6, which allows a shut-off of the return line 5 and 6 respectively.

For example, the shut-off valve RFA is closed when the main needle valve FA is opened, since then no circulation via the return line 5 is required. On the other hand, the shut-off valve RFA is opened when the main needle valve FA is closed, so that the paint system in the paint supply 3 then can circulate via the return line 5.

In the same way, the shut-off valve RFB in the return line 6 is opened when the other main needle valve FB is closed. The shut-off valve RFB, on the other hand, is closed when the main needle valve FB is opened, since then no circulation via the return line 6 is required.

The two paint feeds 3, 4 lead via one

Main needle valve FA and FB in a common line section 7, which leads to the bell cup 2.

In addition, the rotary atomizer 1 has two rinsing lines 8, 9, which run separately from one another in the rotary atomizer 1, wherein a flushing agent for solvent-based lacquer is supplied via the flushing line 8, while a flushing agent for water-based lacquer is supplied via the flushing line 9.

The two purge lines 8, 9 open via a respective purge valve Vl or V2 in the line section 7 between the two main needle valves FA, FB and the bell cup 2 and thereby allow flushing of the rotary atomizer 1 with the various rinsing agents, the two purge lines 8, 9 are supplied.

The exemplary embodiment according to FIG. 2 corresponds largely to the exemplary embodiment according to FIG. 1, so that reference is made to the above description to avoid repetition, the same reference numbers being used for corresponding components below.

A special feature of this embodiment is that in the line section 7 a common Hauptnadel- valve HN is arranged, while in the two paint supply lines 3, 4 each have a shut-off valve FGl or FG2 is arranged to prevent contact between the various paint systems in the two paint feeds 3, 4.

The exemplary embodiment according to FIG. 3 again corresponds in part to the exemplary embodiment according to FIG. 1, so that reference is made to FIG. 1 in order to avoid repetition, with the same reference numbers being used for corresponding components in the following.

A special feature of this embodiment is that in addition to the two paint feeds 3, 4, a third paint supply 10 is provided, which opens via a further main needle valve FC in the common line section 7.

In addition, a separate return line 11 also branches off from the third paint feed 10 via a shut-off valve RFC, so that even in the paint feed 10 the supplied paint can circulate permanently, as already described above.

Another special feature of this embodiment is that in addition to the two purge lines 8, 9, a third purge line 12 opens via a further purge valve V3 in the line section 7, wherein the mouth of the purge lines 8, 9 and 12 in this embodiment, immediately in front of the bell cup. 2 is, so that the purge lines 8, 9, 12 are particularly suitable for short rinsing of the bell cup 2.

In addition, the rotary atomizer 1 in this exemplary embodiment has three further flushing lines 13, 14 and 15 auf, which open via a respective flush valve vi, v2 and v3 in the common line section 7 of the rotary atomizer 1. The mouth of the purge line 13-15 is here in the common line section 7 immediately behind the main needle valve FA-FC, ie at the upstream end of the common line section 7. The purge lines 13-15 are therefore suitable for normal flushing of the common line section 7, the from the purge lines 8,

9 and 12 can be flushed less effectively.

In this embodiment, the rotary atomizer allows not only a change between different paint systems (solvent and water paint), but also a change between different colors. Thus, different colors of a paint system can be supplied via the two paint feeds 3, 4 in the so-called A / B operation, whereas another paint system is supplied via the paint feed 10.

FIG. 4 shows a modification of the one described above

Embodiments, so that reference is made to avoid repetition of the above description, wherein the same reference numerals are used for corresponding components in the following.

A special feature of this embodiment is that the rotary atomizer 1 three paint feeds 3, 4 and

10, but only two internal purge lines 8, 13 for supplying different rinsing agents.

The purge line 8 opens via a purge valve KS downstream behind the common main needle valve HN in the common power section 7, so that the flushing line 8 is particularly well suited for short rinsing the bell cup 2.

The other purge line 13, however, opens via a flush valve V in the common line section 7 upstream of the common Haupnnoviventil CN. The purge line 13 is therefore also suitable for flushing the main needle valve HN.

In this exemplary embodiment, various rinsing agents can be supplied which are adapted to the different paint systems and are supplied via three external rinse lines 16, 17, 18. The external purge lines 16, 17, 18 are in this case connected via an external Spülventilanordnung 19 with the two internal purge lines 8, 13, so that each of the external purge lines 16-18 of the purge valve assembly 19 with one or both of the purge lines 8, 13 can be connected ,

The flushing valve arrangement 19 is in this case arranged outside the rotary atomizer 1 and can be arranged, for example, on a robot arm of a painting robot. The distribution of the various flushing means from the external flushing lines 16-18 to the two internal flushing lines 8, 13 is effected by three flushing valves Vl, V2 and V3 connected in parallel and two flushing valves FG KS and GF V. connected in parallel on the output side.

Finally, FIG. 5 shows two painting robots 20, 21 according to the invention, which can be moved linearly along a travel rail 22.

The two painting robots 20, 21 each have a robot base 23 on which a roundel 24 is rotatably mounted about a vertical axis. On the rondel 24 is a robot arm 25 ("arm 1") pivotally mounted, wherein the robot arm 25 carries another robot arm 26 ("arm 2"). The robot arm 26 finally carries, via a robot hand axis 7, an electrostatic rotary atomizer 28, as described above and shown in various exemplary embodiments in FIGS. 1 bxs 4.

In the robot base 23, the roundel 24 and the two robot arms 25, 26 different components of the paint shop can be arranged distributed, such as

Doser, color changer and the Spulventilanordnung 19 of Figure 4.

The exemplary embodiment according to FIG. 6 corresponds largely to the exemplary embodiment according to FIG. 1, so that the

Reference is made to avoid repetition of the above description, wherein the same reference numerals are used for corresponding components in the following.

A special feature of this exemplary embodiment is that the Spulleitung 8 is the only Spulleitung.

The invention is not limited to the preferred exemplary embodiments described above. Rather, a variety of variants and modifications is possible, which also make use of the idea of the invention and therefore fall within the scope of protection. LIST OF REFERENCE NUMBERS

1 rotary atomizer FG KS flushing valve

2 bell plates FG V flushing valve

3 paint supply HN main needle valve

4 paint supply FGl shut-off valve

5 Return line FG2 shut-off valve

6 Return line KS flushing valve

7 Line section RFA shut-off valve

8 purge line RFB shut-off valve

9 Flush line RFC shut-off valve

10 Paint feed V Flush valve

11 return Vl flushing valve

12 purge line V2 purge valve

13 purge line V3 purge valve

14 purge line

15 flushing line

16 flushing line

17 purge line

18 purge line

19 flush valve arrangement

20 painting robots

21 painting robots

22 Travel rail

23 robot base

24 roundel

25 robot arm

26 robot arm

27 hand axis

28 rotary atomizers

FA main needle valve

FB main needle valve

FC main needle valve

Claims

1. Atomiser (1; 28), in particular rotary atomizer, with a first paint feed (3) for a first paint system, characterized by at least one additional second paint feed (4) for a second paint system, wherein the two paint feeds (3, 4) from each other are separated, so that the atomizer (1, 28) can apply either one of the two different paint systems.

2. Atomiser (1; 28) according to claim 1, characterized by: a) a first main needle valve (FA) in the first paint feed (3), b) a second main needle valve (FB) in the second paint feed (4), and c) an application element (2), in particular a bell cup, for application of the two paint systems, wherein the two main needle valves (FA, FB) are connected to the application element (2) and supply the application element (2) with the first paint system or with the second paint system ,

3. Atomiser (1; 28) according to claim 2, characterized by a) a first main needle monitoring for monitoring the first main needle valve (FA) and b) an additional second main needle monitoring for monitoring the second main needle valve (FB).

4. Atomiser (1, 28) according to claim 1, characterized by: a) a common main needle valve (HN) for the two paint feeds (3, 4), and b) an application element (2), in particular a bell cup, for application of the two Paint systems, wherein the common main needle valve (HN) are connected to the application element (2) and supplies the application element (2) with the first paint system or with the second paint system.

5. Atomiser (1, 28) according to one of the preceding claims, characterized by a) a first return line (5) branching off from the first paint feed (3), and b) a second return line (6) coming from the second paint feed (4) branches off, wherein the two return lines (5, 6) are separated from each other.

6. Atomizer (1; 28) according to claim 5, characterized in that the two separate return lines open downstream in a common return line.

7. Atomiser (1; 28) according to one of the preceding claims, characterized by a) at least one outer electrode for electrostatic

External charging of the applied paint systems, and / or b) at least one contact electrode for electrostatic direct charging of the applied paint systems.

8. Atomiser (1; 28) according to one of the preceding claims, characterized by a) a first flushing line (8) for flushing the atomizer (1; 28) with a first flushing agent, which is connected to the first

B) a second flushing line (9) for flushing the atomizer (1; 28) with a second flushing agent, which is adapted to the second lacquer system, c) wherein the two flushing lines (8, 9) in the atomizer (1 ; 28) run separately from each other and allow the supply of different rinsing agents for the two paint systems.

9. atomizer (1; 28) according to claim 8, characterized by a third rinsing line (12) for rinsing the atomizer (1; 28) with a third rinsing agent, the chemical reaction between the paint systems and / or between prevents the adapted detergent.

10. Atomiser (1; 28) according to claim 8 or 9, characterized in that a) at least one of the flushing lines (8, 9) in the atomizer (1; 28) opens into a line section (7) downstream b) at least one of the flushing lines (13) in the atomizer (1; 28) opens into a line section which upstream of the common main needle valve (HN) opens downstream of the common main needle valve (HN) or downstream of the two separate main needle valves; or upstream of the two separate main needle valves.

11. An atomiser (1; 28) according to any one of claims 8 to 10, characterized in that a) at least one of the flushing lines for short flushes in the atomizer (1; 28) opens into a line section which downstream of the common Hauptna- deiventii (HN) or downstream of the two separate main needle valves, and c) at least one of the purge lines in the atomizer (1;

28) opens into a line section which upstream of the common main needle valve (HN) or upstream of the two separate main needle valves.

12. Atomiser (1; 28) according to one of claims 2, 3 or 7, characterized in that only a single purge line

(8) is provided, which opens in the atomizer (1; 28) in a line section (7) downstream of the two main needle valves (FA, FB),

13. An atomiser (1; 28) according to any one of the preceding claims, characterized in that the various paint systems comprise a water-based paint and a solvent-based paint.

14. An atomiser (1; 28) according to any one of the preceding claims, characterized in that the different paint systems comprise a basecoat and a clearcoat.

15. Varnishing machine, in particular painting robot, with an atomizer (1, 28) according to one of the preceding claims.

16. A coating machine according to claim 15, characterized by a) at least one common internal flushing line (8, 13) which is arranged in the atomizer (1, 28) and via b) a plurality of external flushing lines (16, 17, 18) arranged outside the atomiser (1, 28) and supplying a flushing agent for each of the lacquer systems, respectively, and c ) a purge valve arrangement (19) arranged outside the atomizer (1; 28), which is connected on the input side to the external purge lines (16, 17, 18) and on the input side to the internal purge line (8, 13).

17. A coating machine according to claim 16, characterized in that a) at least one internal purge line (8) for short flushing in the atomizer (1; 28) opens into a line section (7) downstream of the common main needle valve (HN) or downstream of the two separate main needle valves; and b) at least one further internal purge line (13) in the atomizer (1; 28) opens into a conduit section (7) upstream of the common main needle valve (HN) or upstream of the two separate ones Main needle valves is located.

18. Varnishing machine according to one of claims 15 to 17, characterized by a) a first supply line which supplies the first paint feed of the atomizer (1; 28) with the first paint system, and b) a second feed train, the second paint feed of the atomizer ( 1, 28) supplied with the second paint system, wherein the two supply lines are separated from each other.

19. A coating machine according to claim 18, characterized by a) a first color changer, which feeds the first supply line with a changeable color of the first lacquer system, b) a second color changer, which feeds the second supply strand with a changeable color of the second lacquer system.

20. Varnishing machine according to one of claims 15 to 17, characterized by: a) a first metering pump for metering the first paint system, and b) a second metering pump for metering the second paint system.

21. A coating machine according to claim 20, characterized in that: a) the first metering pump is arranged in the first supply line, and b) the second metering pump is arranged in the second supply line.

22. A coating machine according to one of claims 15 to 21, characterized by: a) a first robot arm (25), and b) a second robot arm (26) which is movably mounted on the first robot arm (25) and a robot hand axis (27) with the atomizer (1, 28) carries.

23. A coating machine according to claim 22, characterized in that: a) that the two metering pumps are attached to the first robot arm (25), or b) that the two metering pumps are attached to the second robot arm (26), or c) one of the two metering pumps is attached to the first robot arm (25) while the other of the two metering pumps is attached to the second robot arm (26) is.

24. Varnishing machine according to one of claims 20 to 23, characterized by a traverse axis with a carriage which is movable on a rail (22), wherein the first

Metering pump and / or the second metering pump is arranged to ride on the carriage.

25. Varnishing machine according to one of claims 20 to 21, character- ized in that the first metering pump and / or the second metering pump in the atomizer (1, 28) is integrated.

26 spray booth with a painting machine according to one of claims 15 to 25 and a cabin wall, wherein the first metering pump and / or the second metering pump is arranged on the cabin wall either within the paint booth or outside the spray booth.

27. Operating method for an atomizer (1; 28), in particular for an atomizer (1; 28) according to one of the claims

1 to 14, wherein the atomizer (1, 28) is operated successively with different paint systems, characterized in that the different paint systems in the atomizer (1, 28) are fed via separate paint feeds.

28. Operating method according to claim 27, characterized in that the different paint systems in the atomizer (1, 28) are supplied via separate main needle valves (FA, FB) for each of the paint systems.

29. Operating method according to claim 27, characterized in that the different paint systems in the atomizer (1, 28) are supplied via a common main needle valve (HN) for both paint systems.

30. Operating method according to one of claims 27 to 29, characterized in that the atomizer (1; 28) is rinsed with different rinsing agents, wherein the different rinsing agents are each adapted to one of the paint systems.

31. Operating method according to one of claims 27 to 30, characterized in that a) the atomizer (1; 28) is rinsed successively with at least three different rinsing agents, b) the first rinsing agent is adapted to the first coating system, c) the second rinsing agent is adapted to the second paint system, and d) is rinsed with the third rinsing agent when changing between the different paint systems, wherein the third rinsing agent is a chemical reaction between the first paint system and the second paint system and / or between the first rinse and the second detergent prevented.

32. Operating method according to one of claims 27 to 31, characterized in that the metering of the different paint systems is effected by a respective metering device.

33. Operating method according to one of claims 27 to 32, characterized in that a) the metering of the first coating system is effected by two metering devices and b) the metering of the second coating system is effected by a single metering device.

34. Operating method according to one of claims 27 to 33, characterized in that the different paint systems comprise a water-based paint and a solvent-based paint.

35. Operating method according to one of claims 27 to 34, characterized in that the different paint systems comprise a basecoat and a clearcoat.

* * * * *