DE8907540U1 - Booth for spray coating objects with powder coating material - Google Patents

Description

Joachim Pingel, Klabundeweg 16, 2000 Hamburg 67

Booth for spray coating objects with powdered coating material ("a")

The invention relates to a kit for spray coating objects with powder, with

a) a booth space delimited by a wall, into which the objects for coating are introduced from a booth entrance and removed again through this (booth for discontinuous operation, e.g. manual coating) or led through to a booth exit (flow-through booth, i.e. booth for continuous workpiece transport during automatic and/or manual coating);

b) units for extracting exhaust air;

c) filter units for cleaning the exhaust air and/or separation units for powder components contained in the exhaust air;

d) units for collecting, sieving and/or recycling powder components contained in the exhaust air; and

e) preferably control devices for controlling the cleaning units and the air flows.

Such booths are used for electrostatic powder coating, which is increasingly used, particularly for reasons of greater environmental compatibility, as generally described in the VDMA standard sheet, 24 371, Part 1 of March 1980 and Part 2 of August 1983. Coating material for the most diverse types of components or working parts or other everyday objects is not available as a dispersion dissolved in a solvent, i.e. is not processed using a paint spraying process, for example, but is applied in the form of granules. This granule is usually fed with the help of an injector from a fluidizing container through a hose to a powder gun. In this gun, high-pressure

Electrodes are mounted that are charged with voltage and charge the powder electrostatically. The charged powder is sprayed from the gun towards the grounded workpiece. The charged powder is deposited on the workpiece, usually at around 40% of the sprayed amount of material. The portion of powder that is sprayed past the workpiece is collected in the powder booth and fed back into the coating process.

There are essentially two main types of booths known for powder coating, namely booths or systems for discontinuous workpiece transport during manual coating on the one hand and continuous workpiece transport during manual and/or automatic coating in flow booths on the other. Which of these basic types is used depends essentially on the scope of the respective coating task, i.e. the job to be carried out by the coater, whereby five main categories can be distinguished here, namely

1) large production batches in only one or a few colours (coating area 1000 m and more),

2) medium production batches, in several colours

(coating area 200 to 1000 m ),

3) Application of many different colours for smaller batch sizes (coating area in the order of 100 m ),

4) Individual production, coating of small batches, e.g. for sample production in a wide range of colour tones, and

5) Carrying out cleaning work on individual parts/workpieces and equipment.

This categorization already shows how different the requirements are for the system/cabin used in each case and that it is important to find the best ratio between working/setup time, material costs and environmental impact. It is easy to see that in order to meet the five

Functional categories each have quite different main requirements. For example, %

large production batches (case 1) should be endeavoured to recover as much powder material as possible; for this purpose, booths with cartridge filters (star-pleated filter cartridges) are usually used, which have a large filter surface and filter very finely, but are also expensive, and a filter set comprising several cartridges is required for each colour to achieve a sufficient filter surface. For medium-sized batches (case 2), the main focus is on reducing set-up times and filter costs due to the need for rapid colour changes; therefore, cheaper fabric filters, i.e. flat filters, are regularly used here, which can be exchanged quickly but have a lower degree of filtration, so that in view of environmental impact and occupational safety, post-filtering, for which cartridge filters are often used, is necessary. For processing smaller batch sizes (case 3), an even faster colour change is crucial; for this purpose, flow separators/cyclones are used, which can be cleaned by blowing them out, for example, whereby the separated powder is collected in collecting trays and fed back into the coating process; this process is only possible with a post-filter, since cyclones only achieve a filtering level of approx. 90%. For the individual production of workpieces (case 4), normal cleaning systems with a high filtering level are used, i.e. cartridge filters (as in case 1), but work without recovery and the separated powder is collected in collecting trays as waste. Finally, for the cleaning of individual parts and the cleaning of equipment (case 5), metal lamellas are often inserted or interposed, which take on a guiding function with regard to the air and are intended to help prevent a backflow of powder dust. Here, too, collecting trays for powder waste are used, since with the small amounts of powder, it is not possible to return it to the coating system.

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- 4 economical 1st.

With all the systems known to date, only partial requirements can be met in an economical way, since the known systems do contain interchangeable functional elements, in particular filters and containers for different colors, but are rigid as a whole and usually only work according to a specific, predetermined filtering principle that is tied to the booth structure. It is also common to combine a large number of cartridge and bag filters in completely interchangeable units in order to be able to exchange a complete unit for a new one when changing the color. However, this option is limited to a relatively small number of colors due to the filter costs per color.

The invention is based on the object of providing a booth arrangement with powder recovery option, which can be quickly adapted to changing production requirements and makes the provision of a large number of booths and recovery units for different coating tasks and arrangements superfluous, while at the same time the number of filters or filter units for coating without recovery should be minimized, especially for smaller production batches or special colors.

To solve this problem, a modularly constructed booth is proposed, which includes as components a booth space, extraction units for the exhaust air, filter and separation (cyclone) units for cleaning and separating powder from the exhaust air, collection and return units (powder containers, collecting trays and return lines) and, if necessary, the necessary control elements - and of course the necessary for the function as a spray coating booth (in connection with the solution according to the invention, however, as they are regularly integrated into other parts or are also common) - stock containers.

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sions and feeders for the powder and spraying units for the powder, whereby these components are designed as complete, independently manageable and storable housing parts, standardized in terms of size and connection elements and easily interchangeable, and are to be mounted on the booth space constructed as a core or central body. Such a spray coating booth, which can be assembled according to the modular principle, sensibly overcomes the disadvantages shown by the state of the art by providing a flexible, uniform booth system, if necessary and when appropriate with powder recovery options, which can be adapted to the processing task and requirement to be fulfilled (batch size, frequency of color change, etc.) quickly and economically and without significant loss of time, but at the same time enables optimal recovery of the material not applied. In contrast to the known exchange measures for filter units and paint containers, the invention not only proposes an exchange option for individual parts, but rather an overall variation concept and booth system with the booth as the central component. The latter can be combined with already prepared and thus stored, fully equipped components to fulfill the processing/coating task to be solved. This results in a significant reduction in changeover times because in all normal cases, after the booth has been converted, the previously used functional and housing parts can be cleaned in peace while the booth is already working again. A further advantage is that, for example, if the need to rework individual parts arises in larger production batches coated in a continuous process, the filter unit used on the continuous booth with the associated recovery system can be removed and attached to a hand booth located next to it. This means that even during the set-up, the filter unit can be cleaned with the associated recovery system.

When the flow booth is being prepared for the next production order, the rework/respraying of the faulty workpieces can be carried out in the manual booth, which leads to considerable savings in time and coating material.

In order to avoid the formation of back turbulence of blown-off powder when cleaning equipment and blowing off individual parts/workpieces, which could settle on the cabin wall again, a further development of the invention provides a - known - sheet metal slat insert for the central body,

An additional extension of the application area of the cabin according to the invention is provided by the fact that the central body enclosing the cabin space is advantageously provided with a motor-driven cleaning device, the contour of which is adapted to the cross-section of the cabin interior and which is equipped with elastic scraping elements, preferably arranged at an angle to the direction of movement, which sweep the entire surface of the cabin wall including any surface filters. With such a cleaning unit, the necessary cleaning work can be carried out quickly and reliably without having to enter the cabin interior.

In particular, the following knowledge about the use of surface filters in relation to cartridge filters can be used:

Compared to cartridge filters, which allow a higher degree of separation due to their larger filter surface in relation to their size, surface filters have the advantage that they are relatively inexpensive to manufacture and allow very quick filter replacement when changing colors (e.g. Velcro fasteners for needle felt filters), which is particularly advantageous when medium or small batch sizes of parts are to be produced.

For reasons of effectiveness and, above all, costs, different flat filter structures have become known for different purposes, including paper, fabric, mineral, metal and plastic filters.

Components comprising flat or surface filters can also be equipped with at least one pressure nozzle that can be moved over the side of the filter facing the cabin interior, with this filter back being designed with a cell system that is sealed off from one another. This makes it possible to regularly and continuously clean surface filters that operate with a lower degree of filtration - e.g. compared to cartridge filters - during cabin operation, thus keeping the filters functional.

Preferably, the cleaning device and pressure nozzles can be connected to the control device in such a way that they can be moved synchronously along the surface filters. This further increases the effectiveness.

The booth can also include components that are provided as a filter unit with a cleaning device that can be moved through the central body and a surface filter attached to it in order to be able to clean the booth and filter quickly and effectively. In order to be able to use filter materials that are easy to clean, a sufficiently large filter surface must be available. For this purpose, a second suction channel that leads to an external filter unit can advantageously be integrated into the cleaning device. A cyclone unit can also be provided for multi-color operation.

Overall, the invention provides a kit or a cabin system that includes the following components, which can be arranged on rollers and movable and can be connected to one another using quick-release fasteners, and from these components

can be assembled into a wide variety of cabin combinations using a modular design:

a) Cabin housing as a central block, if necessary equipped with an automatic mechanical cleaning device for the cabin interior and equipped with the necessary spraying units;

b) one or more, possibly different, filter units;

c) Cabin housing lower section in three variants, namely

ca) collecting tray with powder discharge opening at the lowest point;

cb) powder collection and conveying device, preferably comprising a powder storage container with fluid base, integrated vibration sieve machine and injector unit for powder conveying;

cc) suction tray;

d) separator, in particular in the form of a cyclone, with a suction channel to the cabin interior and a blow-out opening under a post-filter housing and with a powder collection container below the cyclone;

e) Flat filter unit, if necessary combined with cleaning device;

f) separate cleaning unit, if necessary combined with surface filter and/or second suction channel;

g) Sheet metal slat insert.

In addition, additional units such as a hinged control unit that is switched on when the

A cleaning device with scraper lips of the type described above, which can be swivelled into the cabin for the purpose of mechanical cleaning and can be moved by motor, a multi-stage suction fan, a vibrating unit for a screening machine, elements for the compressed air supply, a control system for filter cleaning, or the like can be arranged in the cabin.

Further advantages and embodiments or possibilities of the invention will become apparent from the following description of the embodiments shown in the schematic drawing. It shows

Fig. 1 a cabin central body with extraction unit in front view,

Fig. 2 is a section I-I of Fig. 1,

Fig. 3 a movable powder collecting container in front view,

Fig. 4 is a section IV-IV of Fig. 3,

Fig. 5 is a front view of a powder storage container with side injector,

Fig. 6 a section VI-VI of Fig. 5 with sieve,

Fluid base and intake manifold for injector,

r'ig. 7 a cartridge filter unit in front view,

Fig. 8 a section through the unit of Fig. 7 in side view,

Fig. 9 a front view of a surface filter and cleaning unit with a movable cleaning device that movably carries the surface filter with it,

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Fig. 10 is a section X-X of Fig. 9,

Fig. 11 a filter unit with a U-shaped surface filter and a rear nozzle cleaning device for da-j filters,

Fig. 12 is a section XII-XII of Fig. 11,

Fig. 13 a cyclone insert unit,

Fig. 14 is a section XIV-XIV of Fig. 13,

Fig. 15 a front view of a sheet metal slat insert,

Fig. 16 is a section XVI-XVI of Fig. 15, Fig. 17 is a section XVII-XVII of Fig. 15,

Fig. 18 a sectional side view of a booth with filter system and powder recovery,

Fig. 19 a sectional side view of a booth with surface filter system with cleaning and recovery as well as with post-cleaning and powder collection container,

Fig. 20 a sectional side view of a booth with cyclone separation and with a unit for post-cleaning and residual powder separation,

Fig. 21 a sectional side view of a booth with movable surface filter, cleaning device including secondary extraction and cartridge filter post-cleaning

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-limit powder waste container,

Fig. 22 a detail of Fig. 21 according to arrow XXII in enlarged scale,

Fig. 23 a detail similar to Fig. 22, but in the front position of the movable cleaning device with an additional cleaning option for scraper blades carried by the cleaning wall,

Fig. 24 a sectional side view of a

Booth for multi-colour operation without powder recovery and

Fig. 25 is a sectional side view of a cabin similar to Fig. 24, but with slatted insert.

First of all, it should be pointed out that the central body of the cabin is shown in all illustrations as a hand cabin, i.e. as a cabin space with a front access opening. However, it goes without saying that instead of such a central body, which has only been shown in the same form in all figures for the sake of simplicity, one can also be used that has two side openings and a slot for a workpiece conveyor, so that the cabin can be used in continuous operation. In this case, parts present in the cabin or that can be moved by it, such as a cleaning device 4, are designed accordingly, i.e. provided with passages etc.

In Fig. 1 and 2, a central body for a cabin 1 that can be assembled in a modular system is shown, whereby this central body is essentially determined by a cabin space 10, which is separated by a wall 11 with a cabin ceiling 16 and a cabin floor 14 in

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its essential dimensions are limited and rest on a support frame 12. This cabin space 10 has a working opening 13, here schematically simplified in the form of the view surface of Fig. 1, while in a walk-through cabin the corresponding cabin entrances and exits would be in the main surface of Fig. 2. An extraction system, i.e. an extraction unit 5 in the form of an extraction fan 50 with the corresponding parts of an extraction duct system 501, is arranged on the cabin ceiling 16. Opposite the working opening 13, the central body is open for the connection of other units to be described in more detail and is equipped with the necessary connection means (flanges, clamps, fitting bolts, etc.) for such units, which in turn have corresponding counterparts, and which are not shown in more detail for reasons of simplicity and clarity.

The powder holder 6 shown in Fig. 3 and 4 is mounted as an independent structure on a roller frame 65 and is provided here as a simple powder collection tray 61, which can have any suitable cross-sectional shape in addition to the trapezoidal shape shown. This powder collection tray 61 is generally used as a container in such cases.

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collected powder is not intended, but is treated as waste.

The situation is different with the powder holder 6 shown in Fig. 5 and 6, which is designed as a powder collecting container 62 with the aim of recovering and reusing collected powder. Therefore, this powder collecting container, which also rests on a cage frame 65, comprises a sieve bottom 621, a fluid bottom 622 for fluidizing the collected powder and an injector 623 arranged in an injector slot 624, via which collected and cleaned powder can be returned to the coating circuit.

For high cleaning performance, a filter shown in Fig. 7 and 8

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shown filter unit 2a with cartridge filters 21, which are connected to a suction duct system and are equipped with connections 211 for filter cleaning by compressed air. Cartridge filters, as is known from the state of the art, have a large filter surface and thus a high cleaning performance.

In Fig. 9 and 10, a filter unit 2b is provided with a surface filter 22, which in this embodiment is provided as a movable surface element 220, mounted in a cleaning device 4 and is movable with the latter. The cleaning device 4 comprises a carrier 41, the contour or edge 411 of which essentially corresponds to the contour of the cabin interior 10, and leaves only a working gap 43 free in relation to the latter, as can be seen even better from the detailed representations in Fig. 22 and 23. Along its edge 411, the carrier 41 is equipped with elastic cleaning elements 42, which are fastened at an angle to its direction of movement B and parallel to one another and are designed like wings, which fill the working gap 43 and are arranged in the form of one or more rings. These cleaning elements 42 have scraping lips or scraping edges.

■3 £* J. UlLJ-, UXC ^j^^t^ll V^JU^= INUJJXlId IVYUIlUUIi ¹ J .LX CXQOI.XOU11 rest resiliently and scrape off powder deposited on the booth walls when the cleaning device 4 is moved. To move the cleaning device and to store it in a stable position in relation to the interior of the booth, a holder 412 is provided, only schematically indicated here, which can be equipped with or connected to the motor drive at the same time. The cleaning device 4 is designed as a suction wall 45 and this is designed along the circumference of the carrier 41 with a second suction channel 53 in the form of a circumferential carrier or ring channel 530, which is connected to the working gap 43 between the scraping lips 421 via a suction opening 532 on the one hand and a second suction hose 533 on the other. The carrier 41 is open at the back so that the surface

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The suction filter 22 must be subjected to negative suction pressure and can function properly.

Fig. 11 and 12 show a filter housing component 2c for another embodiment of a surface filter in the form of a U-shaped filter, which, in addition to a main filter surface 221, comprises filter wings 223 extending forwards at an angle from its side edges 222, and is thus significantly enlarged in its total filter surface. This U-shaped surface filter 22 is equipped on the back with a flat filter cleaning device 7, which has cell-like sections 72 distributed in a specific pattern over its back. These sections 72 are swept over by a pressure nozzle 71, which applies air pressure to one or possibly several cells at the same time, while the remaining filter surface is subjected to the suction vacuum. This cleaning device 7 therefore ensures that the filter is constantly cleaned while it is working. The cell-shaped sections 72 are provided here essentially in a horizontal extension, but with an inclined arrangement of the horizontal cell walls, as indicated, so that the nozzle 71 can easily reach the top and bottom row of cells when moving in a vertical direction and can also ensure that the filter 22, 221/223 is sufficiently pressurized in this area to blow off powder that has settled on it.

In Fig. 13 and 14, a separator housing component (unit) 3, which is equipped with a cyclone 31, is shown. As can be seen from Fig. 14, the necessary connections for an extraction channel 311, with which powder-laden exhaust air from the booth is sucked into the cyclone 31, and for an exhaust air channel 312 from the cyclone to a post-cleaning, i.e. post-filter, device are provided on the separator unit 3.

In Fig. 15 to 17 a lamella insert unit 23 is

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shown how it is used for cleaning individual parts and cleaning equipment by interposing it between the booth and the filter unit in order to direct the exhaust air and prevent powder dust from accumulating.

All of the units shown, like the central cabin body 1, rest on this adapted support member 12, so that the various parts can be easily assembled in the different combinations without the need to overcome or compensate for any height differences. In other words, all of the parts are designed to fit together and as such can be stored and handled individually in a space-saving manner.

From Figs. 18 to 21, 24 and 25, one can see various possible variations of the booth 1, i.e. the central body, with the various units in order to be able to carry out different coating tasks and functions in accordance with the five functional categories described at the beginning. Fig. 18 shows the combination of a booth core body 1 with a filter unit 2a and a powder collecting container 62. In this booth arrangement, all powder material sucked in via the cartridge filters 21 is collected in the powder collecting container 62 and returned directly to the spraying units not shown here. Such a coating system is used to produce large production batches in accordance with case 1 of the categories described at the beginning. When the color changes, the filter unit 2a and the powder collecting container 62 are exchanged and they can be cleaned while the next coating process with a different color is already underway after the interior of the booth has been cleaned in an appropriate manner.

The booth unit in Fig. 19 is constructed using a flat filter unit 2c with continuous cleaning during the coating operation and a cartridge filter

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The powder material cleaned on the surface filter 22 is returned to the coating circuit by a powder collecting container 62 being connected to it, while the powder accumulating during the subsequent cleaning on the cartridge filters 21 is considered waste and is collected in a powder collecting tray 61. Such a booth system is particularly suitable when medium-sized batches are to be produced and a quick color change is required, whereby the appropriate filter materials can be used as surface filters, with the main focus on quick replacement. When changing colors, only the powder collecting container 62 needs to be replaced and disposed of separately. The surface filter cleaning device 7 operates during the entire coating operation in that the pressure nozzle 71 is continuously moved over the sections 72 and the individual sections are subjected to pressure, ^whereby the section subjected to pressure is sealed against the suction negative pressure by a suitable design of the front surface of the nozzle. The pressure generated by the pressure nozzle 71 pushes the powder adhering to the filter in this area back into the chamber 10 so that the surface filter 22 can be constantly regenerated during operation. When the coating application in question has been completed, this pressure nozzle system can of course also be used, depending on the filter material used, to completely clean the surface filter so that no filter change is necessary for the next application. Since the cartridge filter 21 only functions as a post-filter, it can be cleaned in position via connection 211. This means that when the colour is changed, it is not necessary to change the housing units and filters.

Fig. 20 shows a system for coating smaller batch sizes, with a separating unit 3 with a not visible

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Cyclone and, behind it, a filter unit 2a with cartridge filter 21 is installed for the purpose of post-cleaning. This system is used to process smaller batch sizes; the powder separated by the cyclone is fed back into the coating process, while the powder collected on the cartridge filters 21 during post-cleaning is collected in the powder collection system 61 and treated as waste. It is crucial that the color change can be carried out quickly. For this purpose, only the booth area needs to be cleaned, while at the same time a second person can replace or change the unit 3.

The system shown in Fig. 21 comprises a filter unit 2b with a movable surface filter 220 which, during coating, is acted upon by the suction device 5, sucks in the air from the booth through the carrier 41 so that the majority of the powder in the air settles on the filter. This powder can be cleaned by a surface filter cleaning device not shown here but shown, for example, in Fig. 19 and passes between the scraping lips 421 into a secondary suction channel 33 or 530 which is connected to an external secondary filter unit (not shown) via a hose 533. The cartridge filters 21 of the unit 2a ensure the subsequent cleaning. The powder separated here is collected as waste in a powder collection tray 61. To clean the booth, the cleaning device is set in motion via the holder 412 with a drive in the direction B towards the booth opening 13, and the scraper lips 421 scrape off the powder adhering to the booth wall. This is immediately sucked into the secondary suction channel 53 and fed via the hose 533 to a secondary or secondary filter unit arranged outside the booth, which is not shown here.

In Fig. 22, the detail of the cleaning device 4 of Fig. 21 can be seen in the lower floor area.

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A sealing lip 422 is arranged behind a scraping lip 421 of the cleaning element 42, so that when negative pressure is generated in the secondary suction channel 53, which here, in order to leave the space behind the filter 220 as free as possible, is designed as a narrow, ring-shaped support or ring channel 530, air is sucked into this channel 53 from the front of the filter, which carries the powder material, which is scraped off the cabin walls by the scraping lips 421, directly into the secondary suction channel.

to charge.

Fig. 23 then shows another possibility for cleaning the cleaning elements 42 or the scraping lips 421 themselves, in that a compressed air channel 423 is provided in the front position of the cleaning device 4 with the surface filter 22C in the cabin along its edge, not visible in Fig. 21. This channel 423 runs around the front of the cabin opening, in accordance with the arrangement of the ring of cleaning elements 42. When the scraping lips have reached the front edge of the cabin, the front side of the support 41 carrying the scraping lips is flush with the inner edge of the compressed air channel 423 and only leaves its opening towards the suction channel 53 free. In the channel 423, compressed air pulses are generated which remove the powder from the scraper lips and, when a corresponding negative pressure is generated in the suction channel 53, suck it into it so that it can reach the external secondary or second filter device mentioned above (not shown) and be fed back into the coating process.

The booth arrangement shown in Fig. 24 shows a combination of the booth core body 1 or 10 with a cartridge filter unit 2a and a powder collection tray 61. Such a booth combination is used in multi-color operation, i.e. when color changes have to be made relatively frequently and only relatively

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moderately small batch sizes are to be coated. In such cases, powder recovery is not worthwhile, which is why the powder separated on the cartridge filters 21 is collected in powder collection trays 61 and treated as waste.

The purpose of the cabin arrangement shown in Fig. 25 is similar, in ^which a slatted insert 23 ^is arranged between the housing components 1 ^and 2a in order to ^improve the air flow and to prevent air backflow when, in such an arrangement, individual parts or equipment are blown off from the opening 13.

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Claims (1)

Expectations: 1. Booth (1) for spray coating objects with powder, with a) a booth space (10) delimited by a wall (11) into which the objects for coating are introduced from a booth entrance (13) and Aw-^s+V^ /^ &lgr; ation W^ ^ö/ ^ ^ö> * ^ö ^* *" ¹ ^ /~&ngr;&tgr;&eegr; m &agr;&eegr; r\r\dv ·?&igr;&igr; c* &iacgr;&tgr;&idigr;&ogr;&tgr;&pgr; Vzi)~\i - inner outlet (13); b) units (5) for extracting the exhaust air; c) filter units (2) for cleaning the exhaust air and/or separation units (3) for powder components contained in the exhaust air; d) units (6) for collecting and recycling powder components contained in the exhaust air; and e) preferably control devices for controlling the cleaning units and the air flows; wherein the components are designed as complete, independently handleable and storable housing parts, standardized in terms of size and connecting elements and easily interchangeable with one another and are to be mounted on the cabin space (10) as a central body. Cabin according to claim 1, characterized in that a sheet metal slat insert (23) is provided for the central body (10). 3. Cabin according to claim 1 or 2, characterized in that the cabin - 21 - ff Vt • · &igr;
111 · · » - 21 - The central body, which encompasses the cabin (10), is provided with a motor-driven cleaning device (4) whose contour is adapted to the cross-section of the cabin interior and which is equipped with elastic scraping elements (42) which sweep the entire surface of the cabin wall (11), including any surface filters (22) arranged therein. 4. Cabin according to one of claims 1 to 1, characterized in that a component (2c) comprising a flat or surface filter (22) is equipped with at least one pressure nozzle (71) which can be moved over the rear side of the filter facing the cabin space (10), this filter rear side being designed with a cell system (72) which is sealed off from one another. 5. Cabin according to claim 3 or 4, characterized in that the cleaning device (4) and pressure nozzle (71) are connected to the control device so that they can be moved synchronously along the surface filters (22). 6. Cabin according to one of claims 1 to 5, characterized in that a filter unit (2b) is provided with a cleaning device (4) that is preferably motor-movable through the cabin space/central body (10) and a surface filter (220) attached to it. 7. Cabin according to claim 6, characterized in that a second suction channel (53) is integrated into the cleaning device (4). 8. Cabin according to one of claims 1 to 7, characterized in that it comprises a cyclone unit (3). - 22 -