EP0360162B1 - Cleaning device, especially for metallic work pieces - Google Patents

Abstract

A cleaning device, especially for metallic work pieces, in particular for removing solid and/or liquid residues such as sand, chips, lubricant or the like, is provided with a dip tank for a washing liquid and nozzles arranged in the tank and connected to a pressure line for washing liquid or air, and also a receiving fixture for receiving the work piece to be cleaned. A plurality of these receiving fixtures are arranged on the periphery of a polygonal wheel. The receiving fixtures are rotatable about an axis which is essentially perpendicular to the axis of the polygonal wheel. In this arrangement, the work pieces are passed through the dip tank during the rotation of the bucket wheel.

Description

The invention relates to a device for cleaning preferably metallic workpieces, in particular for removing solid and / or liquid residues such as sand, chips, lubricants or the like, with an immersion container for a washing liquid and arranged in the container, with a pressure line for washing liquid or Air-connected nozzles, as well as with a receiving device for receiving the workpiece to be cleaned and with at least one polygonal wheel rotatable about a substantially horizontal axis, on the circumference of which several of the receiving devices are arranged spaced apart from one another, and at least one of the at the rotation of the polygonal wheel the workpieces picked up protrudes into the immersion container.

Machining residues or impurities are often found on workpieces of the most varied shapes made of the most varied materials or material compositions of metallic and non-metallic type. These adhere to both the outer surface and the inner wall surfaces of cavities or bores or other recesses. These can be both intermediate products and finished products.

From DE 74 14 125 U1 a device for cleaning smaller workpieces such as cast and pressed parts made of metal or plastic in a bath made of organic solvents is known. A motorized transport wheel rotates baskets that contain the workpieces and which are immersed in the lower part of the solvent bath. A spraying device generates turbulence in the solvent that flushes the workpieces.

To load and empty the transport wheel, the shopping baskets are slidably mounted parallel to the axis of rotation of the transport wheel. The shopping baskets contain the small workpieces loosely and are immovably attached to the circumference of the transport edge. As a result, the parts are whirled together when the transport wheel rotates relative to the basket and with respect to one another and are thus increasingly exposed to the solvent.

Another cleaning device for cleaning small objects, especially bolts, screws and other small parts from mass production, in solvent baths is known from GB 1 446 083 A. In a cleaning boiler, a wheel is attached to a horizontal shaft so that the wheel circumference does not reach below the surface of the solvent, but only passes through the vapor zone above the solvent. Cylindrical drums are provided on the wheel at regular intervals, the axis of which is arranged parallel to the axis of rotation of the wheel. These drums hold a large number of small parts to be cleaned and are equipped with a special internal structure which is intended to ensure that the small parts are shaken and moved as intensively as possible when the drum is rotated around the horizontal axis.

Such cleaning devices with transport wheels with a star-shaped arrangement of several positions and shopping baskets or drums have so far not been used in washing systems for objects with complicated outer contours. This applies in particular to devices and systems that are to be used, for example, in the automotive industry to treat engines or gear workpieces.

In cleaning systems for the automotive industry, for example, devices according to DE 84 37 870 U1 are known. This does not use polygonal wheels, rather the workpieces are individually immersed separately in an immersion container with a washing liquid, the workpieces being clamped onto holding devices and, with the aid of a rotary drive, being exposed to jet jets in the immersion bath which are to achieve the most comprehensive cleaning effect possible.

DE 35 39 620 C1 also discloses a cleaning system for cleaning, in particular, metallic workpieces. The workpieces are fastened to a workpiece carrier which can be rotated about an axis of rotation. In particular, the problems with the storage of the corresponding axes of rotation with regard to the washing liquid that is aggressive against lubrication are examined.

These cleaning devices have proven themselves in practice and are used successfully. However, due to the time required for clamping, they do not yet work at the desired speeds.

In general, the actual washing process is only one of several stations of a cleaning device. These systems are used, for example, in the automotive industry for the treatment of used to clean engines or gearbox workpieces and in turn form part of a production line. The workpiece (the motor to be cleaned or parts thereof) is delivered to the conveyor system and then gripped by a holding mechanism in the first station of the cleaning device, lifted by a lifting system and transferred to a second station by an upper transfer. This second station is the actual washing station with the treatment bath. The workpiece to be cleaned is immersed and cleaned in it, then raised and aftertreated or drained with spray nozzles above the bath.

The upper transfer transports the workpiece to further stations, in which, for example, predetermined cavities have to be cleaned again, the workpiece has to be room-air-dried, warm-air-dried or cooled, deposited and separated from the upper transfer. There is a workpiece in each station at a certain time. The upper transfer cycles a workpiece from one station to the next. The slowest station therefore determines the speed of the entire system. A new workpiece can only be picked up in the lifting station at the beginning of the system when the previous workpiece is removed from the first station and the grippers are thus released again.

The total cycle time therefore consists of the time in which the workpiece is conveyed into the slowest station, namely the washing station, plus the treatment time in this station and the conveying out of the station until the grippers are free again Of the next workpiece are ready.

The cycle times of such cleaning devices are in the range of around 40 seconds and can practically no longer be reduced.

However, there is a requirement to significantly reduce cycle times - especially in the motor vehicle industry - since the workpieces could be delivered at higher speeds.

The use of transport wheels with shopping baskets, as explained above, is self-evident. In the case of clamped workpieces in transport wheels similar to the prior art, the cleaning effect would be unsatisfactory since the nozzles for washing liquid or air could not act on the workpieces from all sides and in them Transport wheels do not occur due to the shaking of the small parts.

In contrast, the object of the invention is to propose a device which is also suitable for more demanding workpieces and nevertheless works relatively faster.

This object is achieved in that the receiving devices of at least one polygonal wheel can be rotated about an additional axis of rotation, and in that the additional axis of rotation is approximately perpendicular to the axis of the polygonal wheel.

As a result of this measure, the cycle time can be practically reduced to half compared to separately operating cleaning devices. By using the polygon wheel, the times for transportation and treatment no longer add up, but rather are carried out in parallel. In the cleaning device This means that there are several workpieces at the same time, but their treatment is just as thorough as before. The throughput of workpieces per time can be doubled, although under certain circumstances each individual workpiece spends more time in the entire cleaning system.

Polygon wheels with a star-shaped arrangement of several positions are known, but their use in car washes is limited. Until now, the only thought was to treat the workpieces on the circumference of the polygon wheel by spraying and to dry them in a second polygon wheel. However, this means that the dirty water always falls from the upper positions back onto the workpieces in the lower position and thus jeopardizes the result of the cleaning process.

These problems do not arise according to the invention. The post-cleaning takes place in another station of the cleaning device; Soiling of the washing liquid and back soiling of the workpiece through subsequent cleaning is therefore excluded. Dirt is removed in two stages at the same time (more are conceivable but not necessary), which increases the degree of purity on the workpiece.

The embodiment of a polygon wheel with six holding devices in which the workpiece can be held is particularly advantageous. Of these receptacles, each offset by 60 °, there are two (the two lower) positions below the level of the immersion bath. This makes a particularly advantageous cleaning process possible, since nozzles can be directed onto the workpiece from different directions.

The rotation of the workpiece about a longitudinal axis approximately perpendicular to the axis of rotation of the polygonal gear enables the workpieces to also lie essentially in the plane of the polygonal gear and do not move away from it during rotation. In addition to the desirable effect that the overall depth is reduced, an arrangement of the nozzles very close to the workpiece to be cleaned is also possible.

A very special advantage arises when the nozzles are arranged opposite one another on different sides of the polygonal wheel plane and at a distance from the workpiece to be immersed, and when the flow emitted by them hits the workpiece at an angle to one another, so that a liquid roller surrounds it Workpiece forms.

In addition to the intrinsic movement of the workpiece about its axis of rotation, which is along the polygonal wheel axis, a second movement is superimposed in this way. This particularly favors the removal of detached dirt particles etc. and the constant circulation of the solvent mixture within the immersion bath.

It is preferred if the direction of rotation of the receiving device of the workpiece about its additional axis of rotation is opposite to the direction of rotation of this liquid roller. This further enhances the effect.

In an embodiment in which two positions below the level of the immersion bath are simultaneously occupied by workpieces, it is preferred if the direction of rotation of the receiving devices of the workpieces in the two below the level of the washing liquid positions are opposite to each other.

This, in particular in combination with the liquid roller described above, makes it possible to still apply flowing liquid to workpieces which are particularly difficult to reach, for example of gears or crankshafts, in the case of workpieces which are in particular irregularly shaped or provided with undercuts.

Although the same speed is preferred for both positions, depending on the type of workpiece, it would also be possible to provide different rotational speeds of the rotating workpiece at the two positions.

From GB 2 122 566 A a cleaning device of a slightly different type is known. Among other things, Following a liquid bath, a sprinkling station in which the objects to be cleaned are sprayed with clean water.

In contrast, in the present application, a post-cleaning station is provided which is spaced from the polygon gear in the axial direction of the polygon gear axis and is out of engagement with the immersion container and has extendable lances for cleaning the interior of the workpiece and / or movable systems for targeted post-treatment.

With such a post-treatment station, internal bores of motor housings can also be cleaned in a targeted manner that cannot be reached with nozzles in the immersion baths.

Drying is also advantageously carried out in a polygon wheel of a similar design with six positions. This can be arranged on the same axis of rotation and driven synchronously. Multi-stage drying - dripping, pulsating and / or continuous blowing on the outside or blowing out the inside contours with fan air or compressed (compressed) air - in different positions is possible.

A particularly preferred exemplary embodiment of the invention is described in detail below with reference to the drawing.

• Fig. 1 einen vertikalen Längsschnitt durch die gesamte Reinigungsvorrichtung;
• Fig. 2 eine teilweise geschnittene Aufsicht auf die Reinigungsvorrichtung aus Fig. 1;
• Fig. 3 einen vertikalen Querschnitt durch die Reinigungsvorrichtung aus Fig. 1 in Höhe der dritten Station;
• Fig. 4 einen vertikalen Querschnitt durch die Reinigungsvorrichtung aus Fig. 1 in Höhe der sechsten Station.

Show it:

• 1 shows a vertical longitudinal section through the entire cleaning device.
• FIG. 2 is a partially sectioned top view of the cleaning device from FIG. 1;
• 3 shows a vertical cross section through the cleaning device from FIG. 1 at the level of the third station;
• Fig. 4 is a vertical cross section through the cleaning device of Fig. 1 at the sixth station.

The exemplary embodiment described below has a total of eight stations in which the workpiece to be cleaned is treated one after the other.

The cleaning device is e.g. integrated into a fully automated production process, for example a transfer line for cylinder crankcases, engines or cylinder heads. The workpiece itself is only indicated symbolically in the figures.

It is first fed to the cleaning device via a friction roller conveyor 11 (see FIGS. 1 and 2). The friction roller conveyor 11 (not shown) has a change lock for clock-controlled workpiece feed and delivers each workpiece in the same position.

The friction roller conveyor 11 ends under an extractor hood 12 in the first station, that is the rotary lifting station 1. In the rotary lifting station 1, the workpiece is picked up on transport pins and raised hydraulically / mechanically to a transport level of the cleaning device. At the same time, a rotational movement into a transverse position can be carried out if this is desirable or expedient for the type of workpiece.

After lifting to the transport level, the upper transfer 15 takes over the workpiece on a transport fork 16. Each transport fork 16 is e.g. Equipped with two conically hardened pins that engage in center holes on the workpiece or on a device for the definitive transport of the workpiece. The transport fork 16 can also be used for hydraulic lifting.

The electromechanical upper transfer 15 extends longitudinally through the entire cleaning device and ensures the further transport of the workpiece. The feed movement is carried out by a positioning motor with stepless start-up and braking characteristics for precise stop, the upper transfer drive 52.

The extractor hood 12 is connected to an exhaust system and serves to isolate external influences on the stations of the cleaning device.

The workpiece is then turned from the rotary lifting station 1 transferred to an empty station 2. This empty station 2 serves as a lock. After the cycle time, the lower limit of the order of magnitude about 20 seconds, the upper transfer 15 transports the workpiece to the third station, that is the washing polygon wheel station 3. This is shown in detail in FIG. 3. The centerpiece of this station is a rotatable polygonal wheel 30, on the circumference of which a total of six holding devices 32 are arranged at 60 ° intervals.

The axis of rotation 31 of the polygonal wheel 30 is parallel to the upper transfer 15 and thus to the direction of movement of the workpiece. 3, the workpiece is moved from the front into the image plane, at the level of the axis of rotation 31, but to the right of it. The loading and unloading position 3.1 is located there. A receiving device 32 is located in the loading and unloading position 3.1. The workpiece is locked in the receiving device 32 by means of spring-loaded, self-locking clamping brackets. This locking takes place during the cycle time, and the upper transfer 15 is released from the workpiece.

Following the cycle time of the loading, the polygonal wheel 30 of the washing polygonal wheel station 3 is rotated further by one position, which corresponds to 60 °, in the direction of the arrow 33, which is clockwise in FIG. 3. This brings the workpiece into washing position 3.2. The lower part of the washing polygon wheel station 3 is formed by an immersion tank 36 which is filled with washing liquid up to the level of the liquid level 34. The washing liquid level 34 runs above the workpiece in position 3.2, but below the workpiece in position 3.1. The washing liquid is an aqueous liquid that is continuously pumped through a pump system 35 with solids discharge systems and filter devices is reprocessed and continuously circulated.

In position 3.2, the workpiece is completely surrounded by the washing liquid. It is overhung and can be rotated about its axis 39. This axis of rotation 39 is essentially perpendicular to the polygonal wheel axis 31. In position 3.2, nozzles are provided around the workpiece in the holding device 32, which nozzles exert cavitation effects on the workpiece. The workpiece is exposed to steam bubbles across the entire area. For this purpose, the nozzles are arranged depending on the shape of the workpiece to be treated.

It is advantageous if the jet direction of the nozzles is not constant when it hits the workpiece, but varies slightly. This effect can be achieved by wobbling the workpiece. For this purpose, it is ensured that the axis of rotation 39 of the receiving device 32 executes a kind of wobbling movement with respect to the longitudinal axis of the workpiece held on the receiving device when the workpiece carrier is rotating. For this purpose, the axis of rotation 39 of the receiving device 32 can be tilted on the one hand within the polygon gear plane from the vertical direction on the polygon gear axis of rotation 31, and secondly the axis of rotation 39 can also be oriented by a few degrees (for example 5 or 10 °) from the polygon gear plane itself . In this way, intensive cavitation is achieved that covers all surfaces of the workpiece, which also removes machining residues from blind holes and undercut recesses. There are different angles of incidence of the nozzle jets arranged opposite each other on the workpiece surface.

The drive for the wobble rotation is hydraulic or electromechanical. The power supply is provided by a multi-pole pantograph outside the wet area.
The workpiece is also in station 3.2 for the duration of a cycle time. It is then conveyed through a further 60 ° together with its receiving device into a second washing position 3.3.

This position is accordingly 120 ° from the horizontal origin position 3.1 arranged in the axis of rotation of the polygonal wheel 30. It is therefore also below the washing liquid level 34. Here, too, the workpiece is accordingly surrounded by the washing liquid in the immersion container 36. The process from item 3.2 is repeated. The nozzles can be arranged differently to coat other positions on the workpiece. The rotation in positions 3.2 and 3.3 can be done either in the same or in opposite directions. It would also be conceivable to use different rotational speeds in the two positions. This can depend on the type of workpiece to be treated. Usually the rotation will run in the same direction at the same speed.

After this cycle time has elapsed, the workpiece is now rotated again by 60 ° in the polygon gear plane. It is again at the level of the axis of rotation 31 of the polygonal wheel or the loading and unloading position 3.1, that is to say above the washing liquid level 34. The total residence time within the washing liquid is therefore two cycle times.

The workpiece is now in the injection position 3.4; Here, the workpiece is spray-cleaned.

Here, possibly with further rotation of the workpiece about the axis of rotation of the receiving device 32, the workpiece can be sprayed off in order to remove contaminants still adhering to it. A ring-shaped spray system ensures that the workpiece is acted upon throughout the wobbling rotation of the spatial axis.

After a further cycle time, the workpiece is now rotated by 60 ° into the draining position 3.5. This position lies above the axis of rotation 31 of the polygon wheel. This position is used to drain liquid adhering to the workpiece. Here too, the wobbling rotation of the spatial axis continues.

After a further rotation about the axis of rotation 31 of the polygonal wheel 30, the workpiece reaches the second draining position 3.6, in which the process is continued from the position 3.5.

The next rotation by 60 ° leads the workpiece back to the original loading and unloading position 3.1. Here the unlocking from the receiving device 32 and the renewed connection to the upper transfer 15 take place. It should be noted that within the cycle time the workpiece must be picked up and transported by the upper transfer and that during the cycle time the next workpiece must also be delivered by the upper transfer, by this must be solved and attached to the receiving device 32.

So that this can take place, a transport fork 16 of the upper transfer 15 that is released, that is to say releases its workpiece, remains approximately in the vicinity of the loading and unloading position 3.1 of the washing polygon wheel station 3; she even drives a short distance out of engagement with the Polygon wheel. If the workpiece that it has delivered is now moved from position 3.1 to position 3.2, the workpiece that was previously in position 3.6 is simultaneously moved to position 3.1. This workpiece is gripped and conveyed by the free transport fork 16, while at the same time the next workpiece moves up from the empty station 2 into the washing polygon wheel station 3 and is locked in the receiving device 32 which is released at the same cycle time.

In the washing polygon wheel station 3 there are therefore six workpieces in positions 3.1 to 3.6 at the same time.

The transport fork 16 of the upper transfer 15 now travels with its workpiece from the washing polygon wheel station 3 into a post-cleaning station 4. In this, for example, a high-pressure jet deburring unit is provided for deburring the oil channel of a cylinder head or the cylinder crankcase. Workpieces with a complicated, difficult-to-access internal structure require, in addition to cleaning with a washing polygon wheel station, such an aftertreatment with lances which have to be introduced into the workpiece.

To make this possible, the post-cleaning station 4 can be equipped with a rotating unit or swivel unit which brings the workpiece into a suitable position in order to introduce an automatically movable lance into openings or bores, which then cleans the interior. Here again, a solution from the upper transfer 15 takes place. Since a cycle time is generally sufficient for such subsequent cleaning, it is not necessary, however, to provide a polygon gear structure here. The post-cleaning station 4 is generally not filled with a washing liquid. The post-cleaning should not be carried out, for example, in positions 3.5 or 3.6 of the washing polygon wheel station, since then the contaminants, metal splinters etc. removed from the interior of the workpiece, onto the outer contours of the subsequent workpieces to be cleaned in positions 3.2 to 3.4 and into the washing liquid and also would fall on the previously cleaned workpiece in the loading and unloading position 3.1.

In the post-cleaning station 4, these impurities fall to the floor and can be removed there using conventional impurity removal systems.

The upper transfer 15 now transfers the workpiece from the post-cleaning station 4 to the neutral station 5. In this station, the moisture can drip from the interior of the workpiece. At the same time, a lock is thus created between the cleaning stations 3 and 4 on the one hand and the station 6 still to follow.

The polygonal wheel drive 51 and the upper transfer drive 52 are arranged in the space of the neutral station 5, of course separated from it by partitions. The polygon wheels in stations 3 and 6 are driven by incremental rotation. When the machine is at a standstill, it is locked by a hydraulically controlled index bolt.

From the neutral station 5, the upper transfer 15 conveys the workpiece further into the blow polygon wheel station 6. This generally serves to dry the workpiece. It is also constructed as a polygon wheel (here with the reference number 60) with six positions 6.1 to 6.6 and is operated for the sake of simplicity via the same drive and synchronously as the washing polygon wheel 30 of station 3. The upper transfer 15 leads (cf. FIG. 4) the workpiece into a loading and unloading position 6.1, which is at the same height as the transport level of the stations 1 to 5 and the loading and unloading position 3.1 of the station 3. There is again a release from the transport fork 16 and a lock on the receiving device 62. In contrast to those of the washing polygon wheel, the receiving devices 62 cannot be rotated, since a standing load is preferred for drying.

Then, once per cycle time, there is a rotation in the arrow direction of arrow 63 about the axis of rotation 31 of the polygonal wheel 60, whereby in positions 6.2, 6.3 and 6.4 there is a general drying with fan air, while in position 6.5, that is above the transport level, one Start-up unit 64, a drivable blow box for compressed air, for targeted blowing out and blowing off the threaded and blind holes, for example an oil or water circuit, is brought up to the holding device 62 and the workpiece located therein and, if necessary, moved in. This way, the difficult-to-access interior of the workpiece is specifically dried.

Finally, in position 6.6, a general final drying with fan air takes place before the last rotation through 60 ° about the axis of rotation 31 of the polygonal wheel 60 leads the workpiece back into the loading and unloading position 6.1.

As already described in connection with the washing polygon wheel station 3, the workpiece is now released from the lock on the receiving device 62 within one cycle time, to a free transport fork 16 of the upper transfer connected and removed and with the next transport fork 16 a new workpiece is inserted in position 6.1.

This loading and unloading in positions 3.1 and 6.1 can therefore be carried out very quickly and within a cycle time because lifting or lowering movements do not have to take place at the same time. The workpieces are moved directly to positions 3.1 or 6.1 within the transport level without interfering with each other.

From position 6.1, the transport fork 16 of the upper transfer 15 now moves the workpiece into the sound insulation station 7. This station 7 serves as an idle cycle and at the same time shields the noise generated by the fans and blowing arrangements of the blowing polygon wheel station 6 from the surroundings.

During a last cycle time, the workpiece is transferred to the lowering station 8 by the upper transfer 15. In the lowering station 8, the workpiece is lowered again from the transport level onto a friction roller conveyor 81. At the same time, a rotation can take place in order to bring the workpiece into a position in which it can accommodate the next device or in which the friction roller belt 81 can ensure particularly safe removal.

An extractor hood 82 shields the cleaning device again from the outside. The total dwell time of a workpiece in the cleaning device in the described embodiment is eighteen cycle times, namely six cycle times in stations 3 and 6 and one cycle time in each of the other stations. With a cycle time of the order of 20 seconds, this would be a dwell time of 6 minutes. The dwell time is thus considerably longer than in known devices. However, there are always eighteen workpieces in the cleaning device at the same time, namely in each station or position one. The throughput of the cleaning device is increased considerably, namely approximately twice.

Four stairs 91 are provided for maintenance of the system. ensure access to drives 51 and 52 (see Fig. 2). Handling 92 with a railing 93 is also provided.

The storage of the receiving devices 32 of the polygon wheel in the washing polygon wheel station 3 is expediently carried out via a bearing housing according to DE-PS 35 39 620, since the washing liquid must react relatively aggressively to lubricants.

Claims (11)

1. A device for cleaning preferably metallic workpieces, more particularly for eliminating solid and/or liquid residues, such as sand, swarf, lubricants or the like, having a dip container (36) for a washing liquid and having nozzles arranged in the container (36) and connected to a pressure line (pump system 35) for washing liquid or air, as well as having a receiving device (32) for the workpieces to be cleaned and having at least one polygonal wheel (30) which can be rotated about a substantially horizontal axis, on the periphery of which are arranged a plurality of the mutually spaced receiving devices (32) and in which when rotating the polygonal wheel (30) at least one of the workpieces which has been received on the receiving devices (32) projects into the dip container (36), characterised in that the receiving devices (32) of at least one polygonal wheel (30) are rotatable about an additional rotary axis (39) and that the additional rotary axis (39) is approximately perpendicular to the axis (31) of the polygonal wheel (30).

2. A device according to claim 1, characterised in that the additional rotary axis (39) is tilted about an angle out of the plane of the polygonal wheel.

3. A device according to claim 1 or 2, characterised in that the additional rotary axis (39) is tilted about an angle out of the perpendicular to the axis (31) of the polygonal wheel (30), measured in the plane of the polygonal wheel.

4. A device according to any one of the preceding claims, characterised in that the nozzles are arranged opposite each other on different sides of the polygonal wheel plane and at a spacing from the workpieces to be dipped, and that the flow from them is inclined and offset from each other and impinges on the workpiece so that a liquid eddy is formed around the workpiece.

5. A device according to claim 4, characterised in that the direction of rotation of the receiving device of the workpiece is opposite to the direction of rotation of the liquid eddy about its additional rotary axis (39).

6. A device according to any one of the preceding claims, characterised in that six receiving devices (32) are arranged at an angular spacing of 60 degrees in each case over the periphery of the polygonal wheel (30).

7. A device acccording to claim 6, characterised in that the workpieces received in the two lowest receiving devices (32) respectively of the polygonal wheel (30) are located below the washing liquid level (34) in the dip container (36).

8. A device according to claim 7, characterised in that the direction of rotation of the receiving devices of the workpieces is opposite each other in the two positions (3.2 and 3.3) located below the washing liquid level (34).

9. A device according to any one of the preceding claims, characterised in that a transportation device (upper transfer device 15) transports the workpieces to be cleaned parallel to the polygonal wheel axis (31) to a receiving device (32) in a predetermined loading and unloading position (3.1) and transports away the workpiece after its rotation about the polygonal wheel axis (31) parallel to the polygonal wheel axis (31) out of the loading and unloading position (3.1).

10. A device according to any one of the preceding claims, characterised in that on the polygonal wheel axis (31) at a spacing from the polygonal wheel (30) there is arranged a further polygonal wheel (60), which rotates synchronously with the first polygonal wheel (30), has receiving devices (62) for receiving the workpieces and guides the workpieces in positions (6.2 to 6.6), in which they are acted upon for drying.

11. A device according to any one of the preceding claims, characterised in that a subsequent cleaning station (4) is provided which is at a spacing axially of the polygonal wheel axis (31) from the polygonal wheel (30) and is out of engagement with the dip container (36) and has extendable lances for cleaning the inner space of the workpiece and/or movable systems for specialised subsequent treatment.

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