EP2368643A1 - Powder coating assembly for coating workpieces with powder - Google Patents

Abstract

The powder coating plant has a coating booth (1), a powder supply device (3) and a suction channel with a suction opening, which connects the coating booth with the suction channel. The suction channel has another suction opening, which connects the powder supply device with the suction channel. An independent claim is also included for a method for operating a powder coating plant.

Description

Technical area

The invention relates to a powder coating system for coating workpieces with powder.

To coat a workpiece, such as a plate or a cabinet with powder, the powder is sprayed in a powder coating booth using one or more powder spray guns on the workpiece. In order for the powder to adhere better to the workpiece, the powder can be electrostatically charged. However, care must be taken to ensure that the powder in the cabin does not exceed a certain concentration, otherwise there is a danger of explosion. For this reason, the air in the cabin is continuously sucked together with the non-adhering to the workpiece powder, the so-called overspray. In addition, this creates a negative pressure in the cabin, which ensures that no powder escapes from the cabin. Subsequently, the workpiece is heated in an oven, so that the powder liquefies and then hardens. In this way, a closed cover layer is formed on the workpiece. Finally, the workpiece is cooled down again.

Another reason why excess powder is removed from the interior of the cabin during operation is that the cleaning measures during a color change take less time if the booth is already largely freed of excess powder during the coating operation.

State of the art

From the European patent application EP 1 256 386 A2 is a booth for powder coating of workpieces known. In front of the front end wall of the cabin is a manual coater booth, under which a suction line is arranged. The suction line protrudes through the front end wall of the cabin and has a suction opening, so that excess powder can be sucked out of the cabin.

From the European patent application EP 1 007 222 B1 an arrangement for powder coating of workpieces is known. This includes a cabin, a cyclone, a secondary filter and a powder center. The excess powder is sucked out of the cabin via a suction channel and fed to the cyclone. The suction channel comprises a horizontal section in the cabin and a vertical section which runs parallel to the end wall and opens into the cyclone. The powder center, which includes a powder supply facility and its own ventilation, stands between the cyclone and the post-filter. This arrangement for powder coating requires a relatively large area. In addition, if the powder supply device to be cleaned, for a separate suction with filter and fan are provided.

Presentation of the invention

An object of the invention is to provide a powder coating system for coating workpieces with powder, in which no additional suction device with filter and fan is required for the powder supply device.

Advantageously, the powder coating system is particularly compact, so that it manages with very little space.

The object is achieved by a powder coating system for coating workpieces with powder having the features according to claim 1.

The powder coating system according to the invention for coating workpieces with powder comprises a coating booth, a powder supply device and a suction duct which has a first suction opening which connects the coating booth to the suction duct. In addition, the suction channel has a second suction opening, which connects the powder supply device with the suction channel.

Advantageous developments of the invention will become apparent from the features indicated in the dependent claims.

In one embodiment of the powder coating system according to the invention for coating workpieces with powder, the suction channel has a vertically extending section. This is arranged between the coating booth and the powder supply device.

In addition, the powder coating plant according to the invention can be equipped with a manual coating booth.

In a further embodiment of the powder coating system according to the invention, the suction channel has a third suction opening which connects the manual coating booth to the suction channel.

In a third embodiment of the powder coating system according to the invention, the second and the third suction openings are arranged in the vertical section.

Advantageously, the powder supply device of the powder coating system according to the invention has a rear wall which adjoins the manual coater booth.

In addition, it is advantageous if, in the powder coating system according to the invention, the third suction opening is arranged in the rear wall of the powder supply device.

In addition, in the powder coating system according to the invention, the opening width of the second suction opening can be made adjustable.

To solve the problem is also proposed that in the inventive powder coating system, the opening width of the third suction opening is adjustable.

According to a further feature of the invention may be provided in the powder coating system, that the vertical portion of the suction channel is arranged on the front side of the coating booth.

In a development of the powder coating system according to the invention, the vertical section of the suction channel and the powder supply device form a module.

In another development of the powder coating system according to the invention, the rear wall of the powder supply device adjoins the side wall of the coating booth.

In a third development of the powder coating system according to the invention, the suction channel has a horizontally extending section which is arranged below the coating booth. The first suction opening is arranged in the horizontally extending section.

According to a further feature of the powder coating system according to the invention, the suction channel has a horizontally extending section, which is arranged under the manual coating booth.

In an additional embodiment of the powder coating system according to the invention, the first suction opening is arranged in the vertical section of the suction channel. Finally, a method for operating the powder coating system is proposed in which the second suction opening is opened further during the cleaning operation than during the coating operation.

Brief description of the drawings

Figur 1

zeigt eine erste mögliche Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von vorne im Beschichtungsbetrieb.

Figur 2

zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in der Seitenansicht.

Figur 3

zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von vorne in einer zweiten dreidimensionalen Ansicht.

Figur 4

zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in der Draufsicht.

Figur 5

zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in der zweiten dreidimensionalen Ansicht während des Reinigungsbetriebs der Pulverversorgungseinrichtung.

Figur 6

zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von unten.

Figur 7

zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage mit der Pulverversorgungseinrichtung vor und nach der Montage.

Figur 8

zeigt eine zweite mögliche Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von vorne.

Figur 9

zeigt eine dritte mögliche Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von vorne.

Figur 10

zeigt die dritte Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in der Seitenansicht.

Figur 11

zeigt dritte Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in der Draufsicht.

Figur 12

zeigt die dritte mögliche Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage von vorn.

In the following the invention will be explained with several embodiments with reference to twelve figures.

FIG. 1

shows a first possible embodiment of the powder coating system according to the invention obliquely from the front in the coating operation.

FIG. 2

shows the first embodiment of the inventive powder coating system in the side view.

FIG. 3

shows the first embodiment of the powder coating system according to the invention obliquely from the front in a second three-dimensional view.

FIG. 4

shows the first embodiment of the inventive powder coating system in plan view.

FIG. 5

shows the first embodiment of the inventive powder coating plant in the second three-dimensional view during the cleaning operation of the powder supply device.

FIG. 6

shows the first embodiment of the powder coating system according to the invention obliquely from below.

FIG. 7

shows the first embodiment of the inventive powder coating system with the powder supply device before and after assembly.

FIG. 8

shows a second possible embodiment of the powder coating system according to the invention obliquely from the front.

FIG. 9

shows a third possible embodiment of the powder coating system according to the invention obliquely from the front.

FIG. 10

shows the third embodiment of the inventive powder coating system in the side view.

FIG. 11

shows third embodiment of the inventive powder coating system in plan view.

FIG. 12

shows the third possible embodiment of the powder coating system according to the invention from the front.

Ways to carry out the invention

• FIG. 1 shows a first possible embodiment of the inventive powder coating equipment obliquely from front. The powder coating installation comprises a booth 1, a hand coat stand 2, a powder supply device 3 and a suction channel 4. In addition, the powder coating installation may also have a cyclone and a postfilter, which are not shown in the figures. In order to coat a workpiece 6, the workpiece 6 is suspended on a transport rail 5 with a workpiece holder 5.1 and transported through the powder coating system.

At the in FIG. 1 In the embodiment shown, the workpiece 6 passes first the car 1 and then the hand coater stand 2. The hand coater stand 2 has a pedestal 20 which serves as a stand for one person and which can be reached via a staircase 21. There, the workpiece 6 can be nachbeschichtet manually if necessary by the person with a hand spray gun.

An application for manual coating may be that the workpiece 6 has one or more areas that can not be coated in the automatic coating or only with great effort. In this case, the person only manually coats these hardly automatically coatable areas. The remaining areas are coated automatically or mechanically.

If only one or only a few workpieces are to be coated with a color that does not correspond to the color used in automatic coating, then it is advisable to drive for loss when the excess powder is sucked off. The excess powder is not recovered and the coating circuit fed back, but filtered out of the air and disposed of. For this purpose, the suction opening 32.1 is activated while the doors (not shown in the figures) are closed to the car 1. The suction channel 4 is then connected directly to the post-filter, as powder recovery via the cyclone is not economical.

Above the manual coater stand 2 a roof 22 is arranged, which is fastened to the cabin 1.

In addition to the Handbeschichterstand 2 is a control cabinet 7, which contains the control electronics for the Handsprühpistole and the automatic guns 8.

The powder supply device 3 and the vertical section 42 of the suction channel 4 are located on the side opposite the staircase 21 of the manual coater stand 2. The suction channel 4 has an elongated suction opening 32.1 extending, for example, over the height of the work area of the manual coater stand 2, in order to remove excess powder, which does not adhere to the workpiece 6 during manual coating.

The cabin 1 is located, viewed in the transport direction of the workpiece 6, before the Handbeschichterstand 2. Instead, however, the Handbeschichterstand 2 can be arranged in front of the car 1. It is also possible to arrange both a hand coater stand in front of and another behind the car 1.

The cabin 1 has two side walls 9 and 10, each with a plurality of gun slots 9.1 and 10.1. Through the gun slots 9.1 and 10.1 protrude the automatic guns 8 from the outside into the interior of the cabin 1. The automatic guns 8 can be moved together via a not shown Linearhubgerät up and down, that is, along the y-axis. In addition, the automatic pistols 8 can be moved with the Linearhubgerät along the z-axis.

• Figur 2 zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in der Seitenansicht.
• Figur 3 zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von vorne in einer zweiten dreidimensionalen Ansicht. Aus dieser Ansicht ist zuerkennen, dass in der Wand zwischen der Pulverversorgungseinrichtung 3 und dem Absaugkanal 4 eine Schiebetür 41 angeordnet ist. Während des Beschichtungsbetriebs ist die Schiebetür 41 nur einen Spalt weit geöffnet. Dadurch wird nur ein kleiner Teil der gesamten Luftmenge, die durch den Absaugkanal 4 strömt, aus der Pulverversorgungseinrichtung 3 abgesaugt. Der grösste Teil der abgesaugten Luftmenge stammt aus der Kabine 1. Ein weiterer Teil stammt gegebenenfalls vom Handbeschichterstand 2. Während des Reinigungsbetriebs hingegen kann die Schiebetür vollständig geöffnet sein, so dass mehr Luft aus der Pulverversorgungseinrichtung 3 abgesaugt und mehr Luft zur Reinigung der Pulverversorgungseinrichtung zur Verfügung steht.

In addition, the car 1 has a cabin floor 12 arranged on a pedestal 13. On the cabin floor 12, a blow bar 14 is arranged in the middle in the longitudinal direction, which is parallel to the x-axis. Parallel to the first side wall 9 extend first suction openings 12.1, via the excess powder from the cabin interior into the suction channel 43 (FIG. Fig. 6 ) can be sucked. Parallel to the second side wall 10 extend second suction openings 12.2 ( Fig. 9 ), via the excess powder from the cabin interior in the suction passage 44 ( Fig. 6 ) can be sucked. The base 13 is dimensioned so high that under the cabin floor 12, the two suction channels 43 and 44 find space.

• FIG. 2 shows the first embodiment of the inventive powder coating system in the side view.
• FIG. 3 shows the first embodiment of the powder coating system according to the invention obliquely from the front in a second three-dimensional view. From this view, it can be seen that a sliding door 41 is arranged in the wall between the powder supply device 3 and the suction channel 4. During the coating operation is the sliding door 41 open only a crack. As a result, only a small part of the total amount of air flowing through the suction channel 4 is sucked out of the powder supply device 3. The most part of the amount of air sucked comes from the cabin 1. Another part originates from the manual coater booth 2. During the cleaning operation, however, the sliding door can be fully opened so that more air is sucked out of the powder supply device 3 and more air for cleaning the powder supply device available stands.

FIG. 4 shows the first embodiment of the inventive powder coating system in plan view. The two horizontal suction channels 43 and 44 are closed on the powder supply device 3 facing away from each end of the cabin each with a lid 40. If necessary, however, the covers 40 can be removed.

During the coating operation, powder is sucked out of a powder supply device 3 standing in the powder supply device 3 via powder injectors 36 and into the FIGS. 1 to 3 not shown powder lines transported to the powder spray guns 8 and possibly also to the hand coater gun. Once the powder reservoir 35 is empty, the coating operation is briefly interrupted, the empty powder reservoir 35 is removed, replaced with a new powder reservoir and the coating operation continues.

wobei
V̇_Kab der Luftstrom pro Zeiteinheit in der Kabine 1,
V̇_PZ der Luftstrom pro Zeiteinheit in der Pulverversorgungseinrichtung 3 und
V̇_HBS der Luftstrom pro Zeiteinheit im Handbeschichterstand 2 ist.In the following, it will be explained with reference to a numerical example how the suctioned by the exhaust 4 in total Air flow V̇ _ges on the car 1, the powder supply device 3 and the Handbeschichterstand 2 distributed, firstly during the coating operation, secondly during the cleaning of the cabin, thirdly during the cleaning of the powder supply device and fourthly during the coating of small lot sizes only on the hand coater booth. The total air flow V̇ _ges is composed as follows: $${\dot{\mathrm{V}}}_{\mathrm{ges}}\mathrm{=}{\dot{\mathrm{V}}}_{\mathrm{Kab}}\mathrm{+}{\dot{\mathrm{V}}}_{\mathrm{PZ}}\mathrm{+}{\dot{\mathrm{V}}}_{\mathrm{HBS}}$$

in which
V̇ _Kab the air flow per unit of time in the cabin 1,
V̇ _PZ the air flow per unit time in the powder supply device 3 and
V̇ _{HBS is} the air flow per unit time in the manual coater booth 2.

• V̇_ges = 16.000 m³ pro Stunde
• V̇_Kab = 12.000 m³ pro Stunde
• V̇_PZ = 1.000 m³ pro Stunde
• V̇_HBS = 3.000 m³ pro Stunde

During the coating operation, the total air flow V̇ _{ges is composed} numerically as follows:

• V̇ _ges = 16,000 m ³ per hour
• V̇ _Kab = 12,000 m ³ per hour
• V̇ _PZ = 1,000 m ³ per hour
• V̇ _HBS = 3,000 m ³ per hour

The cleaning of the powder coating system is preferably carried out in two phases. As a rule, the cabin 1 is cleaned in the first phase. Then takes place in the second phase, the cleaning of the powder supply device. 3

• V̇_ges = 16.000 m³ pro Stunde
• V̇_Kab = 13.000 m³ pro Stunde
• V̇_PZ = 0 m³ pro Stunde
• V̇_HBS = 3.000 m³ pro Stunde

During the cleaning of the cabin 1, the total air flow V̇ _{ges is composed} numerically as follows:

• V̇ _ges = 16,000 m ³ per hour
• V̇ _Kab = 13,000 m ³ per hour
• V̇ _PZ = 0 m ³ per hour
• V̇ _HBS = 3,000 m ³ per hour

• V̇_ges = 16.000 m³ pro Stunde
• V̇_Kab = 6.000 m³ pro Stunde
• V̇_PZ = 8.000 m³ pro Stunde
• V̇_HBS - 2.000 m³ pro Stunde

During the cleaning of the powder supply device 3, the total air flow V̇ _{ges is composed} numerically as follows:

• V̇ _ges = 16,000 m ³ per hour
• V̇ _Kab = 6,000 m ³ per hour
• V̇ _PZ = 8,000 m ³ per hour
• V̇ _HBS - 2,000 m ³ per hour

• V̇_ges = 16.000 m³ pro Stunde
• V̇_Kab = 6.000 m³ pro Stunde
• V̇_PZ = 1.000 m³ pro Stunde
• V̇_HBS = 9.000 m³ pro Stunde

During the coating of small batches by hand at Handbeschichterstand the total air flow V sets _ges numerically as follows:

• V̇ _ges = 16,000 m ³ per hour
• V̇ _Kab = 6,000 m ³ per hour
• V̇ _PZ = 1,000 m ³ per hour
• V̇ _HBS = 9,000 m ³ per hour

In this operating state, which is also referred to as manual coating operation, the doors of the car 1 are closed. The workpiece 6 is therefore only hand-coated on the hand coater stand 2 by the personnel.

As is apparent from the above numerical example, the existing high suction power is provided to either the car 1 or the powder feeder 3 or the hand coater stand 2 as needed. As a result, the cleaning, for example, of the powder supply device 3 is improved and the cleaning time during a color change is shortened.

• Figur 6 zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von unten. Der horizontal unter dem Kabinenboden 12 verlaufende Absaugkanal 44 mündet in den ebenfalls horizontal verlaufenden und unter dem Handbeschichterpodest 20 angeordneten Sammelkanal 45. Dieser wiederum mündet zusammen mit dem horizontalen Absaugkanal 43 in den vertikalen Absaugkanal 42.
• Figur 7 zeigt die erste Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage mit der Pulverversorgungseinrichtung vor und nach der Montage. Die Pulverversorgungseinrichtung 3 bildet zusammen mit dem vertikalen Absaugkanal 42 ein Modul oder eine Baueinheit, die separat an den Montageort geliefert werden kann und anschliessend an die Kabine 1 angedockt wird. Dazu müssen im Wesentlichen nur die horizontalen Absaugkanäle 43 und 45 mit den vertikalen Absaugkanal 42 verbunden werden.
• Figur 8 zeigt eine zweite mögliche Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von vorne. Bei dieser Ausführungsform ist die Pulverversorgungseinrichtung 3 gegenüber der ersten Ausführungsform um 90° gedreht angeordnet. Die Versorgung der Pulversprühpistolen 8 erfolgt über Pulverschläuche 37, wobei in Figur 8 einer dieser Pulverschläuche zur Veranschaulichung dargestellt ist. Oberhalb der Kabine 1 liegen die Pulverschläuche 37 in einer Verteilerschiene 38 und werden von dort zur jeweiligen Sprühpistole geführt.
• Figur 9 zeigt eine dritte mögliche Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage schräg von vorne. Bei dieser Ausführungsform ist die Pulverversorgungseinrichtung 3 an der Seitenwand 9 der Kabine 1 angeordnet. Die Rückwand 32 der Pulverversorgungseinrichtung 3 grenzt an die Seitenwand 9 der Kabine 1 an. Dadurch wird erreicht, dass der Handbeschichterstand 2 von zwei Seiten aus betretbar ist. Wird auf den Handbeschichterstand 2 verzichtet, reduziert sich die Gesamtlänge der Beschichtungsanlage, was im einen oder anderen Fall ein Vorteil sein kann. Der Steuerschrank 7 kann bei Bedarf an die Seitenwand der Pulverversorgungseinrichtung und des Absaugkanals 42 montiert werden. Die Schiebetür 41 ist bei der dritten Ausführungsform in der Rückwand der Pulverversorgungseinrichtung 2 angeordnet und kann bei Bedarf nach rechts oder links verschoben werden, um die Öffnungsweite der Absaugöffnung einzustellen.
• Figur 10 zeigt die dritte Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in der Seitenansicht.
• Figur 11 zeigt die dritte Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in der Draufsicht.
• Figur 12 zeigt die zweite mögliche Ausführungsform der erfindungsgemässen Pulverbeschichtungsanlage in einer dreidimensionalen Ansicht von vorn.

In order to clean the powder supply device 3, which is required, for example, during a color change, the coating operation is interrupted, the sliding door 41 is opened further, so that more air is sucked out of the powder supply device 3 and the powder reservoir 41 is removed. Then, the powder injectors 36, as in FIG FIG. 5 shown, pivoted through the suction opening 42.1 into the suction channel 4 and cleaned by the prevailing in the suction channel 4 air flow. With a compressed air gun, not shown, and the interior of the powder supply device 3 can be cleaned by the excess powder is blown in the direction of the suction opening 42.1. Once the cleaning of the Pulverinjektoren 36 and the interior of the powder supply device is completed, the Pulverinjektoren 36 are swung out of the suction channel 4 and the sliding door 41 again completely or partially closed.

• FIG. 6 shows the first embodiment of the powder coating system according to the invention obliquely from below. The suction channel 44, which runs horizontally under the cabin floor 12, opens into the likewise horizontally extending collecting channel 45 arranged beneath the hand-coating platform 20. This in turn opens into the vertical suction channel 42 together with the horizontal suction channel 43.
• FIG. 7 shows the first embodiment of the inventive powder coating system with the powder supply device before and after assembly. The powder supply device 3 together with the vertical suction channel 42, a module or a unit that can be supplied separately to the mounting location and is then docked to the car 1. For this purpose, essentially only the horizontal suction channels 43 and 45 must be connected to the vertical suction channel 42.
• FIG. 8 shows a second possible embodiment of the powder coating system according to the invention obliquely from the front. In this embodiment, the powder supply device 3 is arranged rotated by 90 ° with respect to the first embodiment. The supply of powder spray guns 8 via powder hoses 37, wherein in FIG. 8 one of these powder hoses is shown for illustration. Above the booth 1, the powder hoses 37 lie in a distributor rail 38 and are guided from there to the respective spray gun.
• FIG. 9 shows a third possible embodiment of the powder coating system according to the invention obliquely from the front. In this embodiment, the powder supply device 3 arranged on the side wall 9 of the cabin 1. The rear wall 32 of the powder supply device 3 adjoins the side wall 9 of the cabin 1. This ensures that the Handbeschichterstand 2 is accessible from two sides. If the manual coating booth 2 is dispensed with, the overall length of the coating installation is reduced, which can be an advantage in one case or another. The control cabinet 7 can be mounted on the side wall of the powder supply device and the suction channel 42 as needed. The sliding door 41 is disposed in the rear wall of the powder supply device 2 in the third embodiment, and may be shifted to the right or left as necessary to adjust the opening width of the suction opening.
• FIG. 10 shows the third embodiment of the inventive powder coating system in the side view.
• FIG. 11 shows the third embodiment of the inventive powder coating system in plan view.
• FIG. 12 shows the second possible embodiment of the inventive powder coating system in a three-dimensional view from the front.

The foregoing description of the embodiments according to the present invention is for illustrative purposes only, and not for the purpose of limiting the invention. Various changes and modifications are possible within the scope of the invention without departing from the scope of the invention and its equivalents. For example, the different in the FIGS. 1 to 12 also shown components of the powder coating system in a manner other than shown in the figures combined with each other.

LIST OF REFERENCE NUMBERS

1

cabin

2

Handbeschichterstand

3

Powder supply device

4

suction

5

transport rail

5.1

bracket

6

workpiece

7

control cabinet

8th

spray gun

9

first sidewall

9.1

gun slot

10

second side wall

10.1

gun slot

11

canopy

12

cabin floor

12.1

Suction opening for the cabin

12.2

Suction opening for the cabin

13

base

14

blowing strip

20

podium

21

stairway

22

top, roof

30

Side wall

31

top, roof

32

Rear wall of the powder supply device

32.1

Suction opening for the manual coating booth

33

ground

34

base

35

Powder reservoir

36

powder pump

37

powder hose

38

buss

40

cover

41

sliding door

42

Side wall of the suction channel

42.1

Suction opening for the powder supply device

43

horizontal suction channel

44

horizontal suction channel

45

horizontal collection channel

Claims (15)

Powder coating plant for coating workpieces with powder, with a coating booth (1), - With a powder supply device (3), and - With a suction channel (4) having a first suction opening (12.1, 12.2), which connects the coating booth (1) with the suction channel (4), and having a second suction opening (42.1), the powder supply means (3) with the suction channel (4) connects. Powder coating plant according to claim 1, wherein the suction channel (4) between the coating booth (1) and the powder supply device (3) is arranged. Powder coating system according to claim 1 or 2,
with a manual coater stand (2). Powder coating plant according to claim 2, wherein the suction channel (4) has a third suction opening (32.1) which connects the hand coating station (2) with the suction channel (4). Powder coating installation according to one of the claims 1 to 4, - In which the suction channel (4) has a vertical portion, and - In which the second and the third suction opening (32.1, 42.1) in the vertical portion of the suction channel (4) are arranged. Powder coating installation according to one of claims 1 to 5,
in which the powder supply device (3) has a rear wall (32) which adjoins the hand coater stand (2). Powder coating plant according to one of the claims 1 to 6,
in which the opening width of the second suction opening (42.1) is adjustable. Powder coating installation according to one of the claims 1 to 7,
at the opening width of the third suction opening (32.1) is adjustable. Powder coating installation according to one of the claims 1 to 8,
in which the vertical section of the suction channel (4) is arranged on the front side of the coating booth (1). Powder coating plant according to one of the claims 1 to 9,
in which the vertical section of the suction channel (4) and the powder supply device (3) form a module. Powder coating installation according to one of the claims 6 to 10,
in which the rear wall (32) of the powder supply device (3) adjoins a side wall (9; 10) of the coating booth (1). Powder coating plant according to one of the claims 1 to 11, - In which the suction channel (4) has a horizontally extending portion (43) which is arranged under the coating booth (2), and - In which the first suction opening (12.1) in the horizontally extending portion (43) is arranged. Powder coating plant according to one of the claims 3 to 12,
in which the suction channel (4) has a horizontally extending portion (45) which is arranged under the hand coater stand (2). Powder coating installation according to one of the claims 1 to 13,
in which the first suction opening (12.1) is arranged in the vertical section of the suction channel (4). Method for operating the powder coating installation according to one of the claims 1 to 14,
in which during the cleaning of the powder supply device (3) the second suction opening (42.1) is opened further than during the coating operation.

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