EP2581138A2 - Powder coating assembly with spray media and opposing extraction ports - Google Patents

Abstract

The system has spraying units (2) comprising nozzles for spraying coating powder and arranged in a cabin (1), and suction openings (3) suctioning waste powder. The openings are formed corresponding to the spraying units and assigned to the respective spraying units such that a part of the waste power delivered by the spraying units is sucked by the openings. The openings are arranged in a perpendicular plane that is predetermined by spraying direction of the spraying units. A controlling and/or regulating unit controls amount of the power applied by the spraying units.

Description

The present invention relates to a powder coating apparatus having a plurality of spraying means having nozzles with which coating powder is atomizable, having a booth in which the spraying means are arranged, and having at least one suction opening for sucking off excess coating powder during coating.

In powder coating, which is often referred to as powder coating, an electrically conductive material is coated with a coating powder. For this purpose, the coating powder is electrically charged and sprayed with the spray, usually referred to as a spray gun, on the opposite electrically charged workpiece. The coating powder discharged from the spraying means forms a powder cloud surrounding the workpiece. A large part of the coating powder applied by the spraying means then adheres to the workpiece and can be baked in further steps. However, part of the coating powder sinks towards the bottom of the cabin. This powder is hereinafter referred to as excess powder.

The excess powder is recovered in most powder coating plants and processed for re-application of coating powder on workpieces. It has proven to be advantageous that excess powder, before it has arrived on the ground, is sucked out of the cabin. The aspiration of the powder is often via an open channel which extends over the height of the cabin and the powder via a blower to a powder recovery device supplies, such as in the EP 1 007 222 B1 disclosed. Often the open channel is with one Covered perforated sheet. In known powder coating systems, a high proportion of the excess powder can be recovered. It would be better, however, to reduce the proportion of excess powder compared with the powder used, which is equivalent to an increase in the proportion of the coating powder adhering to the workpiece to the total coating powder used. The quotient of the adhering coating powder and the powder applied to the workpiece is also referred to as the application efficiency.

The resulting in the known powder coating system by the exiting from the spray powder coating powder cloud, from which the workpiece to be coated is wrapped, is relatively inhomogeneous. Thus, the density of the powder cloud in a lower region facing away from the spray agent is often significantly greater than in an upper region away from the spray means, which is essentially due to the powder in the cabin sinking to the bottom. However, since the workpiece must be covered with a layer of lacquer with a minimum thickness, it must be ensured that in the areas where the powder cloud has a low density, sufficient coating powder is present to bring enough coating powder to the workpiece. The amount of coating powder discharged by the spraying means must therefore be so great that, despite the inhomogeneous powder cloud, all areas of the workpiece are sufficiently covered by coating powder, even if this results in unnecessarily large coverage for other areas and a large amount of coating powder has to be used. which in turn has a high proportion of excess coating powder result.

The invention is based on the problem to improve the air flow in a powder coating system so that the amount reduced to the bottom of the cabin sinking excess coating powder and the order efficiency in coating can be improved.

This object is achieved according to the invention in that the powder coating installation has a number of suction openings which are associated with the spraying means in such a way that the excess coating powder dispensed by a spraying means can be sucked away, at least in part, via a suction opening assigned to this spraying means.

The assignment of spraying on the one hand and suction on the other hand allows a more uniform, for example, laminar flow through the cabin. As a result, a more homogeneous powder cloud in the cabin can be achieved, as was previously the case. Due to the homogeneous powder cloud, the workpiece can be coated more uniformly with powder than by a known powder coating system. U. a. Because of these advantages, it is possible to reduce the amount of coating powder used to achieve a sufficient coating over conventional systems. This not only reduces the unit cost of the coating powder. Also, wear on powder-carrying or transporting parts such as hoses, sprays or filters in a powder recovery device can be reduced.

An advantageous embodiment of the invention provides that the powder coating installation has a number of suction openings corresponding to the number of spraying means, wherein each suction opening is assigned to one of the spraying means such that the excess coating powder dispensed from this spraying means can be sucked at least in part through the suction opening associated with the spraying means is. By providing a variety of suction holes, each of which associated with a spray, the air flow in the cabin of the coating system can be significantly improved.

On the one hand by the improved order efficiency and on the other hand by the targeted extraction of the excess coating powder from the cabin before the latter sinks to the bottom, deposits on the cabin floor can be reduced so much that a floor cleaning system to remove the deposits can be largely eliminated.

As a result of the improved application efficiency, the proportion of the recovered coating powder in the amount of powder discharged by the spraying means can be reduced and the proportion of the new powder can be increased. The quality of the discharged powder is improved by, for example, stabilizing a grain size fraction.

Preferably, the spraying means and the suction openings are arranged such that the air flow containing the coating powder is not or almost not mixed with a coating powder-containing air flow from an adjacent spraying means to the associated suction opening or the associated suction openings from the spraying means to the associated suction opening or the associated suction openings ,

The association between the suction openings and the spraying means is preferably such that the suction openings are arranged in a spraying direction of the spraying means substantially opposite to the spraying means. The suction opening associated with a spraying means may expediently be arranged in a vertical plane predetermined by the spraying direction of the spraying means, that is to say in a vertical plane through which an extension of the central axis of the generally horizontal extending nozzle of the spray extends. Advantageously, at least a part of the spraying means and the suction openings are arranged one above the other. The suction opening associated with a spraying means may be arranged offset downwardly in relation to the spraying means to account for the falling of the particles of the coating powder due to gravity on the way from the spraying means to the suction opening. The spraying means and the suction openings are preferably arranged on opposite sides of the cabin, so that a workpiece can be moved between the suction openings and the spraying means.

Preferably, the spraying means are arranged in the cabin such that in an outer wall there are no open openings through which hoses, cables or spraying means pass. The openings are advantageously sealed, so that an air entry into the cabin can be reduced.

A further preferred embodiment of the invention provides that the powder coating system has suction channels, which begin at the suction openings. The excess coating powder can be removed from the suction openings via the suction channels. All or more of the suction channels may terminate at a Sammelabsaugkanal.

The suction channels and / or the collection suction channel may terminate at a powder recovery device where the excess and extracted powder may be recovered and recycled for reuse. Advantageously, the powder recovery device comprises at least one cyclone.

Preferably, the size of at least a part of the suction openings and / or the flow cross-section of at least a part of the intake ducts adjustable. This makes it possible to act on the flow velocity at the suction openings and on the way from the spraying means to the suction openings.

To ensure a uniform flow through the cabin, on the one hand, the air flow with the coating powder has little or no turbulence and on the other hand, a decrease in the coating powder between the spraying and the suction is largely avoided, the flow rate at the suction expediently between 0.5 and 5 m / s, preferably about 0.7 to 5 m / s. Preferably, the suction channels narrow immediately behind the suction openings, whereby there is provided for an increase in the flow rate by 2 to 10 times, in order to counteract deposition of coating powder in the suction channels.

It is advantageous if all or more suction channels have at least one fluid bottom. A fluid bottom prevents the deposition of particles of the extracted, excess coating powder and facilitates the further transport to the powder recovery device. Preferably, a fluid bottom is located immediately behind each suction opening and extends so far into the adjacent narrowing suction channel until the flow rate in the suction channel is sufficiently high at about 15 to 20 m / s to prevent further deposition of coating powder.

A fluid bottom may include a perforated plate or membrane through which air is blown into the suction channel. As a result, coating powder which deposits on the perforated plate or the membrane of the suction channel is fluidized. Preferably, the fluid bottom is in the flow direction of the air through the suction channel inclined downward, so that the fluidized coating powder is transported by the air flow.

All or more of the spraying means may be displaceable in the spraying direction and / or laterally or transversely thereto. This makes it possible to better adapt the powder coating system and the air flows through the cabin to the workpiece to be coated. Advantageously, the spraying means are also movable in height to and fro.

Furthermore, it is also advantageous if the suction openings in the spray direction and / or laterally or transversely to it are displaceable. In the former case, the distance between the suction openings and the workpieces to be coated can be varied as a function of the dimensions of the workpieces, in order to move the suction openings as close as possible to the side of the workpieces to be coated away from the spraying means and thus as much excess coating powder as possible be sucked into the suction, while in the latter case the suction can be tracked in a lateral displacement of the spraying these. For displacing the suction openings, these are preferably arranged in a housing movable relative to the cabin, which surrounds the suction channels and is connected to the Sammelabsaugkanal.

The cabin may have a cabin floor, wherein the cabin has a further suction opening in the region of the cabin floor or on the cabin floor. The further suction opening is not associated with any spraying means and can serve to suck off particles of the excess coating powder, which can not be sucked out of the cabin via a suction opening assigned to the spraying means. The further suction can be arranged downstream of another suction, which also having a fluid bottom. This fluid floor may be inclined downward in the transport direction of the coating powder. Also, the further suction channel may be connected to the Sammelabsaugkanal.

The Sammelabsaugkanal a powder coating system according to the invention may have a flow cross-section which increases in a flow or transport direction of the excess coating powder from the first opening suction channel to the last entering suction, thus increasing the flow or transport direction volume of the transported excess coating powder and the increasing volume the air carrying the powder passing through the sump suction passage is carried.

A powder coating installation according to the invention can have a fan with which excess coating powder can be sucked out via the suction openings.

A powder coating installation according to the invention can have a control and / or regulating means with which the amount of coating powder discharged with the spraying means, the flow rate in the suction openings, the suction channels or in the collecting suction channel, the size of the suction openings, the flow cross section in the suction channels or in the collecting suction channel and / or the distance of the spray from the associated suction openings adjustable, in particular controllable and / or regulated. The control and / or regulating means can be supplied to this size as input variables, which are detected by sensors of the powder coating system.

• Fig. 1 zeigt eine schematische Schnittansicht einer erfindungsgemäßen Pulverbeschichtungsanlage;
• Fig. 2 zeigt eine Oberseitenansicht einer weiteren erfindungsgemäßen Pulverbeschichtungsanlage mit einer Kabine, Sprühmitteln und Absaugeinrichtungen;
• Fig. 3 zeigt eine Schnittansicht der Pulverbeschichtungsanlage entlang der Linie A-A der Fig. 2 bei der Beschichtung eines dicken Werkstücks;
• Fig. 4 zeigt eine Schnittansicht der Pulverbeschichtungsanlage entlang der Linie A-A der Fig. 2 bei der Beschichtung eines dünnen Werkstücks;
• Fig. 5 zeigt eine Vorderseitenansicht einer Absaugeinrichtung mit Absaugöffnungen;
• Fig. 6 zeigt eine Schnittansicht entlang der Linie B-B der Fig. 5;
• Fig. 7 zeigt eine perspektivische Ansicht eines Saugkastens der Absaugeinrichtungen;
• Fig. 8 zeigt eine auseinander gezogene perspektivische Ansicht eines Fluidbodens des Saugkastens;
• Fig. 9 zeigt eine vergrößerte Schnittansicht von Teilen des Saugkastens;
• Fig. 10 zeigt eine Vorderseitenansicht eines Saugkastens mit anderen Absaugöffnungen;
• Fig. 11 zeigt eine Schnittansicht entlang der Linie C-C der Fig. 10.

Further features and advantages of the present invention will become apparent with reference to the drawing with reference to the following Description of two embodiments of a powder coating system explained.

• Fig. 1 shows a schematic sectional view of a powder coating system according to the invention;
• Fig. 2 shows a top view of another powder coating system according to the invention with a cabin, spraying means and suction devices;
• Fig. 3 shows a sectional view of the powder coating plant along the line AA of Fig. 2 when coating a thick workpiece;
• Fig. 4 shows a sectional view of the powder coating plant along the line AA of Fig. 2 when coating a thin workpiece;
• Fig. 5 shows a front view of a suction device with suction holes;
• Fig. 6 shows a sectional view taken along the line BB of Fig. 5 ;
• Fig. 7 shows a perspective view of a suction box of the suction devices;
• Fig. 8 shows an exploded perspective view of a fluid bottom of the suction box;
• Fig. 9 shows an enlarged sectional view of parts of the suction box;
• Fig. 10 shows a front view of a suction box with other suction openings;
• Fig. 11 shows a sectional view taken along the line CC of Fig. 10 ,

Fig. 1 shows a booth 1 of a powder coating system and spraying means 2 mounted therein in the form of powder spray guns with which a coating powder can be discharged. The spraying means 2 are arranged in a row one above the other on one side of the car 1. The spraying means 2 opposite suction openings 3 are arranged. These are horizontal slots. Each spraying means 2 is assigned a suction opening 3.

Exhaustive floating coating powder is sucked out of the booth 1 through the suction openings 3, before it sinks to the bottom of the booth 1. Excess coating powder is called, which is not on a workpiece to be coated (in Fig. 1 not shown) adheres, for example, because it misses the workpiece, rebounds from the workpiece or is deflected by electrostatic fields.

The suction openings 3 are followed by suction channels 4 which taper or constrict along a line 5 corresponding to the spray or flow direction of the coating powder. A bottom of each suction channel 4 is formed immediately behind the suction port by a fluid bottom 6 through which air flows into the suction channel 4 to prevent deposits of the coating powder on the bottom of the channel 4.

All suction channels 4 open into a common Sammelabsaugkanal 7, in which the air streams that transport the excess, sucked coating powder, be merged. The Sammelabsaugkanal 7 leads to a powder recovery device, which in Fig. 1 not shown.

The FIGS. 2 to 10 show a powder coating system 10 according to the present invention. The powder coating system 10 comprises a largely closed cabin 12 through which the workpieces 14 to be coated are conveyed by means of an overhead conveyor 16 (in FIG 3 and 4 only schematically and partially shown) along a rectilinear travel path 18 (FIG. Fig. 2 ) can be moved through hanging. The workpieces 14 are shown there simplified as vertical cylinders, but may have any shape and size.

As in Fig. 2 As shown, the powder coating system 10 comprises two stations 20, which are arranged with opposite orientation one behind the other along the movement path 18. In the two stations 20, the workpieces 14 are sprayed transversely to their direction of movement from opposite sides with a coating powder, for example a paint powder, which is fixed after leaving the cabin 12 in a downstream cabin (not shown) by baking on the workpieces 14 ,

Each of the two stations 20 comprises a plurality of spraying means 2 in the form of powder spray guns with spray nozzles mounted on one side of the path of travel 18 in a row one above the other on a support 22 and movable up and down together with the support 22 up to a limited extent greater than the vertical distance of adjacent spraying means 2. In the region of the holder 22, the cabin wall is provided with a vertical slot opening 23, through which the holder 22 can be moved with the horizontally oriented spraying means 2 into the cabin 20. In the FIGS. 2 to 4 are the sprays 2 itself not shown, but only arrows P, which indicate the spray direction of the spray 2 or powder spray guns. The solid arrows P in 3 and 4 represent the top position of the spraying means 2 in the common up and down movement in the course of the coating of workpieces 14, while the two-dot chain arrows P represent the lowest position.

The movable support 22 of the spraying means 2 of each station 20 is supported by a carriage 24 arranged outside the car 12 with a vertical boom 26. The carriage 24 can be controlled by means of a drive in a direction perpendicular to the movement path 18 horizontal direction to approach the workpieces 14 and move away from the workpieces 14, as in Fig. 2 represented by an arrow R to approach or move the spraying means 2, depending on the dimensions of the workpieces 14, until they have a desired distance from the opposite surfaces of the workpieces 14.

The powder coating system 10 comprises suction devices 28, with which excess coating powder, which does not adhere to the workpieces 14, aspirate from the booth 12 and can be fed to a powder recovery device 30 of each station 20, in which the extracted coating powder is separated from the suction air and for another Order is reprocessed.

The suction means 28 comprise in each of the two stations 20 a suction box 32 which is arranged in the spraying direction of the spraying means 2 or powder spray guns opposite to the same on the other side of the movement path 18 of the workpieces 14.

How best in the FIGS. 5 to 9 illustrated, the suction box 32 consists essentially of a vertical sheet metal housing 34 which is provided on its the workpieces 14 and the spraying means 2 side facing a series of stacked rectangular suction openings 36. As with reference to Fig. 1 has already been carried out, the suction openings 36 serve to suck out excess floating coating powder from the cabin 12 before it sinks to a floor 38 of the cabin 12.

The number of suction openings 36 corresponds to the number of spraying means 2, but the vertical center distance of the suction openings 36 is slightly smaller than the vertical center distance of the spraying means 2, so that after each upward movement of the spraying means 2 the topmost spraying means 2 exactly opposite the top suction opening 36, as through the uppermost solid arrow P in 3 and 4 while, after each downward movement of the spraying means 2, the lowermost spraying means 2 faces the lower end of the lowermost suction opening 36, as indicated by the lowest two-dot chain arrow P in FIG 3 and 4 shown.

The suctioned air volume or the power of a suction fan (not shown) of each station 20 on the one hand and the size of the suction openings 36 on the other hand are adapted to each other so that during the coating of the workpieces 14, the flow rate of the extracted from the cabin 12 , loaded with coating powder air at the suction openings 36 is about 0.7 to 5 m / s. At this flow rate, on the one hand, it is achieved that the coating powder ejected by the spraying means 2 in the form of a substantially homogeneous powder cloud flows uniformly through the cabin to the workpieces 14 and from there to the suction openings 36 moves, on the other hand, however, avoided that by the suction coating powder is sucked away from the surfaces of the workpieces 14.

The suction box 32 surrounds a suction channel 40 narrowing in the flow direction of the air behind each suction opening 36. The narrowing of the suction channels 40 reduces the flow cross-section of the air to the junction 42 into a vertical suction suction channel 44 and thereby increases the flow velocity of the air so that it is about 15 to 25 m / s at the junction 42 of each suction channel 40 into the Sammelabsaugkanal 44. This flow rate is sufficient to prevent deposition of coating powder behind the junction 42.

How best in Fig. 9 represented, at the junction 42 of each suction channel 40 in the Sammelabsaugkanal 44, a slide 46 is arranged so that there the flow cross section and thus the flow rate of the air can be adjusted. Preferably, the slides 46 are positioned so that during operation of the powder coating system 10 through all suction channels 40, the same amount of air is sucked off.

In order to prevent powder coating equipment from settling on a bottom 48 of the suction channels 40 due to the lower flow rate during operation of the powder coating system 10, a large part of the bottom 48 is formed immediately behind the suction opening 36 as the fluid bottom 50, as best shown in FIG Fig. 9 shown.

How best in Fig. 8 and 9 illustrated, each fluid tray 50 consists of a flat closed air box 52, which is bounded up to an air-permeable membrane 53 and with a fan or a compressed air source (not shown), can be supplied from the air in the air box 52. The membrane 53 preferably has pores with a pore size of 20 to 100 μm, preferably 40 to 80 μm, through which the air supplied into the air box 52 flows upward into the suction channel 40, as indicated by small arrows S in FIG Fig. 9 shown. As a result, coating powder, which deposits on the membrane 53, is fluidized and entrained by the air flowing through the suction channel 40.

Any remaining powder can be dissipated by the performance of the fan 28 of each station 20 increases in a cleaning operation of the powder coating system 10 by driving means of a frequency and thereby larger amounts of air are sucked through the suction openings 36 and the suction channels 40. The resulting increase in airflow velocity causes powder deposits to be eliminated.

The FIGS. 3, 4 and 9 further show an arranged in each suction duct baffle 54, which serves to homogenize the air flow in each suction channel 40. The air guide plate 54 is inclined towards the junction 42 in the Sammelabsaugkanal 44 down so that no coating powder can settle on the air guide plate 54. In the same way, the bottom 48 of the suction ducts 40 could also be inclined downwardly towards the mouth 42 thereof into the collecting suction duct 44, thereby avoiding the need for fluid floors 50.

How best in Fig. 2 and 3 shown, the flow cross-section of the Sammelabsaugkanals 44 extends from its lower end to the top, so that despite the air supplied through the junctions of the suction channels 40 in the Sammelabsaugkanal 44, the flow velocity of the air flow in Sammelabsaugkanal 44 remains substantially constant over the entire length thereof.

How best in Fig. 2 . 3 and 4 As shown, the powder recovery device 30 of each station 20 comprises two cyclones 56, the inlets 58 of which are connected to the upper end of the collection suction channel 44. Within the two cyclones 56, the coating powder is separated from the air flow. At the lower end of each cyclone 56 is in each case an ultrasonic or vibrating screen 59, are separated with the impurities from the deposited coating powder. The air separated from the coating powder is passed through an air filter 60 at each station 20.

How best in the Figures 2 and 3 shown, in each station 20 of the suction box 32 is movable together with the two cyclones 56 in a direction perpendicular to the movement path 16 direction. As a result, the suction openings 36 of the suction box 32, depending on the dimensions of the workpieces 14, can be approached or moved away from the movement path 16 until they have a desired distance from the adjacent surfaces of the workpieces 14. When the workpieces 14 have small dimensions transverse to the direction of movement, as in FIG Fig. 4 can be aspirated by a movable, approximated to the workpieces 14 suction box 32 more coating powder than by a stationary suction box, because of the smaller distance between the workpieces 14 and the suction openings 36 less powder between the workpieces 14 and the suction openings 36 to the bottom of the Cabin 12 drops. In addition, in this way, the air flow between the workpieces 14 and the suction openings 36 can be further homogenized, as in 3 and 4 represented by small parallel arrows.

It has been shown that with the powder coating system 10, compared to known systems, the application efficiency could be increased significantly, while simultaneously reducing the total amount of air sucked off. In addition, the excess coating powder is less heavily contaminated and stressed, because a majority of the excess coating powder is already sucked before it sinks to the bottom 38 of the cabin 12. As a result, the effort for the floor cleaning of the cabin 12 can be reduced.

For extracting small amounts of coating powder, which may be deposited on the floor 38 of the cabin 12, which includes in the FIGS. 2 to 10 illustrated powder coating system 10 on the one hand at the lower end of each suction box 32 to the interior of the cabin 12 directed towards suction opening 62, can be sucked by the near the suction boxes 32 coating powder from the bottom 38 of the cabin 12, as in Fig. 2 and 3 shown.

As in Fig. 2 . 3 and 4 In addition, the bottom 38 of the cab 12 between the spraying means 2 and the suction box 32 of each station also has a flat trough-shaped cross-section and is provided with two fluid trays 64 sloping downwardly towards the path of travel 18 which, from time to time, are pressurized are put into operation to possibly on the fluid trays 64 lying coating powder to a central outlet 66 and from there through a separate suction channel (not shown) to promote the inlet of the two cyclones 56.

The FIGS. 10 and 11 show a different suction box 66. The suction box 66 consists essentially only of two vertically spaced behind each other in a sheet metal housing 68 vertically perforated plates 70, 72 and a behind the perforated plate 72 upwardly leading Sammelabsaugkanal 74. Of the two perforated plates 70, 72, the perforated plate 70 adjacent to the movement path 18 has a plurality of small suction openings 76, while the perforated plate 72 adjacent to the collecting suction channel 74 has a smaller number of openings 78. The opening cross-section of the suction openings 76 and the openings 78 is adapted to the extracted air quantity or the performance of the exhaust fan, that during the coating of the workpieces 14, the flow rate of sucked out of the cabin 12, loaded with coating powder air at the suction openings 76th about 0.7 to 5 m / s and at the openings 78 is slightly 15 to 25 m / s, as indicated by arrows of different lengths in Fig. 11 shown schematically.

In other words, flow channels are formed between the suction openings 76 and the openings 78, in which the flow rate increases by a multiple.

Claims (15)

Powder coating installation with a plurality of spraying means having nozzles with which coating powder can be atomized, with a booth in which the spraying means are arranged, and with at least one suction opening for extracting excess coating powder during coating, characterized in that the powder coating installation has a number of suction openings (3; 36; 76) associated with the spraying means (2) such that the excess coating powder dispensed by a spraying means (2) can be evacuated at least in part via a suction opening (3; 36; 76) associated with said spraying means (2) is. Powder coating installation according to claim 1, characterized in that the powder coating installation (10) has a number of suction openings (3; 36) corresponding to the number of spraying means (2), each suction opening (3; 36) being associated with a spraying means (2) in that the excess coating powder discharged by the spraying means (2) can be sucked away, at least in part, via the suction opening (3; 36) associated with this spraying means (2). Powder coating installation according to claim 1 or 2, characterized in that the suction openings (3; 36, 76) are arranged in a spraying direction of the spraying means (2) opposite to the spraying means (2). Powder coating installation according to one of the preceding claims, characterized in that the powder coating installation (10) has suction channels (4; 40) or flow channels starting at the suction openings (3; 36; 76) and that the size of at least a part of the Suction openings (3; 36; 76) and / or the flow cross section of at least part of the suction channels (4, 40) or flow channels is adjustable. Powder coating installation according to one of claims 1 to 4, characterized in that the flow rate increases immediately behind the suction openings (3; 36; 76). Powder coating plant according to claim 5, characterized in that the flow rate behind the suction openings (3; 36; 76) increases by 3 to 10 times. Powder coating installation according to one of Claims 4 to 6, characterized in that all or several suction channels (4, 40) have at least one fluid base (50). Powder coating installation according to one of claims 4 to 7, characterized in that all or more of the suction channels (4; 40) or flow channels open into a collecting suction channel (7; 44; 74) leading upwards or downwards. Powder coating installation according to claim 8, characterized in that the flow cross section of the collecting suction channel (7; 44; 74) widens in the flow direction between the mouth (42) of the first suction channel (4; 40) and the mouth of the last suction channel (4; 40). Powder coating installation according to one of claims 1 to 9, characterized in that the cabin (1; 12) has a cabin floor (38) and at least one further suction opening (62; 66) in the area of the cabin floor (38). Powder coating installation according to one of Claims 4 to 9, characterized by at least one powder recovery device (30) which communicates with the suction openings (3; 36; 76). Powder coating installation according to one of claims 1 to 11, characterized in that at least a part of the suction openings (3; 36; 76) are movable in a spraying direction of the spraying means (2). Powder coating installation according to claim 12, characterized in that the suction openings (3; 36; 76) are arranged in at least one movable suction box (32; 66). Powder coating installation according to one of claims 1 to 13, characterized in that at least part of the spraying means (2) are in their spraying direction and / or vertically movable. Powder coating installation according to one of the preceding claims, characterized by a control and / or regulating means with which the amount of coating powder discharged with the spraying means (2), the flow rate in the suction openings (3; 36; 76), the suction channels (4; ) or in the Sammelabsaugkanal (7; 44; 74), the size of the suction openings (3; 36; 76), the flow cross section in the suction channels (4; 40) or in the Sammelabsaugkanal (7; 44, 74), the distance of the spray ( 2) and the suction openings (3; 36; 76) of a workpiece (14) is adjustable, in particular controllable and / or regulated.

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