WO2008025415A2

WO2008025415A2 - Apparatus for cleaning metal workpieces

Info

Publication number: WO2008025415A2
Application number: PCT/EP2007/006497
Authority: WO
Inventors: Dietmar Lange
Original assignee: Ipsen International Gmbh
Priority date: 2006-08-30
Filing date: 2007-07-21
Publication date: 2008-03-06
Also published as: DE202006013351U1; WO2008025415A3

Abstract

The invention relate to an apparatus for cleaning metal workpieces which comprises a cleaning chamber for receiving the workpieces to be cleaned, wherein a cleaning device that can be moved in relation to the workpieces to be cleaned is arranged within the cleaning chamber for the introduction of a cleaning medium into the cleaning chamber. In order to propose an apparatus for cleaning metal workpieces that has a compact form and additionally makes cleaning possible reliably in the way desired, the invention proposes an apparatus for cleaning metal workpieces (2) which comprises a cleaning chamber (4) for receiving the workpieces (2) to be cleaned, wherein a cleaning device that can be moved in relation to the workpieces (2) to be cleaned is arranged in the cleaning chamber (4) for the introduction of a cleaning medium (5) into the cleaning chamber (4), as well as a further cleaning device that is arranged movably in relation to the workpieces (2) to be cleaned within the cleaning chamber (4).

Description

Device for cleaning metallic workpieces

The invention relates to a device for cleaning metallic workpieces with a cleaning chamber for receiving the workpieces to be cleaned, wherein within the cleaning chamber a movable relative to the workpieces to be cleaned cleaning device for the introduction of a cleaning medium is arranged in the cleaning chamber.

Devices of the aforementioned type, which are also referred to as a washer, are well known from the prior art, which is why it does not require a separate documentary proof at this point.

Devices for cleaning metallic workpieces, that is to say so-called washers, are used to clean metallic workpieces in advance and / or after a treatment, for example a heat treatment, that is to say of dirt particles, oil and / or fat residues or the like to free.

Conventional and known from the prior art devices for cleaning metallic workpieces have a cleaning chamber, in which the workpieces to be cleaned are to be introduced for the purpose of cleaning. The cleaning of the workpieces takes place within the cleaning chamber, either under atmospheric conditions or under vacuum or overpressure. For the purpose of cleaning the workpieces, a cleaning medium is used, for example a water-based liquor. This is introduced into the cleaning chamber and sprayed onto the workpieces to be cleaned, whereby the adhering to the workpieces contaminants are replaced.

For spraying the workpieces to be cleaned with a cleaning medium typically serves a cleaning device which is formed in the form of a cleaning arm and is arranged rotatable relative to the workpieces to be cleaned within the cleaning chamber. The cleaning arm has outlet nozzles for the cleaning medium, by means of which the cleaning medium is sprayed onto the workpieces to be cleaned.

Although the known from the prior art devices for cleaning metallic workpieces have proven in everyday practical use, they are not free of disadvantages.

A first disadvantage of the known devices consists in the expansively large design. The sweeping design of prior art devices for cleaning metallic workpieces is due to the fact that within the cleaning chamber rotatable relative to the workpieces to be cleaned arranged cleaning arm requires a correspondingly large action space with the result that the wash chamber is to be dimensioned accordingly in their geometric dimensions. Typically, workpieces to be cleaned are combined into rectangular cross-section batches around which the cleaning arm arranged centrally within the cleaning chamber moves in a circular path following rotation.

Another disadvantage of the known from the prior art devices for cleaning metallic workpieces is that not always a satisfactory cleaning result can be achieved, especially in complicated geometries of the workpieces to be cleaned. Among other things, this is due to the fact that the cleaning arm revolving around a circular path around the workpieces that are to be cleaned and packed into a rectangular section in a rectangular cross section has a different cleaning arm depending on the rotational position Distance from the workpieces to be cleaned. As a consequence, the workpieces of one and the same batch are subjected to varying degrees of intensity with a cleaning medium. To overcome this disadvantage, it is known from the prior art to provide in particular adjustable spray nozzles within the treatment chamber. If necessary, these spray nozzles, which can be adjusted in particular, can be aligned as desired to ensure uniformly intensive loading of the workpieces of a batch with a cleaning medium. However, this auxiliary structure is disadvantageous in that before each cleaning cycle, the adjustable spray nozzles must be aligned and adjusted depending on the geometry of the workpiece batch. This is particularly time consuming and beyond error prone.

It is the A u f g a b e of the invention, while avoiding the aforementioned disadvantages to provide a device for cleaning of metallic workpieces, which has a compact design and beyond in a reliable manner allows a desired cleaning.

To solve this problem, the invention proposes a device for cleaning metallic workpieces, which is characterized by a further cleaning device arranged movably within the cleaning chamber relative to the workpieces to be cleaned.

In contrast to the devices known from the prior art for the cleaning of metallic workpieces, the device according to the invention not only has one but two cleaning devices, which are arranged relative to the workpieces to be cleaned movable within the cleaning chamber. Due to their respective size, the two cleaning devices provided according to the invention advantageously require an overall smaller action space than the cleaning device previously known from the prior art. Due to this circumstance, the size of the washing chamber according to the device according to the invention falls much smaller than the size of the washing chambers in the devices known from the prior art for the same capacity. This allows for a more compact and less bulky Overall design. Thus, the device of the invention can be much easier and space-saving integrated into existing heat treatment systems.

The two cleaning devices provided according to the invention additionally ensure an overall improved cleaning result. Unlike the previously known from the prior art devices, the distance between the cleaning devices on the one hand and to be cleaned and packed into a batch workpieces on the other hand always substantially the same size, so that a uniform in intensity loading of the workpieces to be cleaned with a cleaning medium can take place, which leads to an overall improved cleaning effect in consequence. Even workpieces with a relatively complicated geometry can be cleaned in a simple manner and standardized in the desired manner. In this respect, no auxiliary construction in the form of specially adjustable outlet nozzles is required.

With the invention, a total device for cleaning workpieces is proposed, which is characterized on the one hand by their compact design and on the other hand creates the ability to clean workpieces reliably and in a simple manner as desired.

According to a further feature of the invention, the cleaning devices are each designed as cleaning arms. The cleaning arms are preferably L-shaped, with one leg of a cleaning arm above and the other leg of a cleaning arm laterally of the workpieces to be cleaned.

The cleaning arms each have a plurality of nozzles arranged thereon, by means of which a cleaning medium can be applied to the workpieces to be cleaned by spraying.

The cleaning arms are arranged in each case rotatable relative to the workpieces to be cleaned within the cleaning chamber, wherein each cleaning arm in a rotational movement in a part-circular manner to be cleaned Workpieces is guided around. The cleaning arms are preferably designed to be reversibly rotatable, that is, they are moved in opposite directions back and forth around the workpieces to be cleaned around.

According to a further feature of the invention, a further, preferably likewise designed in the form of a cleaning arm cleaning device is provided which is disposed within the cleaning chamber below the workpieces to be cleaned. This cleaning arm also has nozzles for applying a cleaning medium to the workpieces to be cleaned by spraying. With the total of three provided cleaning arms, the workpieces to be cleaned and packed together to form a charge can be loaded on the full-circumference with a cleaning medium, so that a desired cleaning of all workpieces to be cleaned can be achieved safely.

In contrast to the two L-shaped and rotatably disposed within the cleaning chamber cleaning arms arranged below the workpieces to be cleaned within the cleaning chamber, third cleaning arm is fixed. Of course, but also arranged below the parts to be cleaned within the cleaning chamber, third cleaning arm relative to the workpieces to be cleaned be designed to be movable, for example, characterized in that this is also designed to be pivotable and / or displaceable.

According to a further feature of the invention, an air supply system is provided, which serves to be able to blow air into the cleaning chamber can. Blowing in air serves to dry workpieces which have previously been exposed to a cleaning medium and are thus cleaned. For this purpose, the air supply system has in the cleaning chamber extending into the air supply pipes, which have air outlet openings through which air is passed to the cleaned but still wet or wet workpieces. Preferably, the air is passed to dry the cleaned workpieces in a closed circuit, that is, there is no additional air from outside the cleaning chamber in this introduced. The guidance of the air for drying the cleaned workpieces in a closed circuit is advantageous for the following reasons:

The cleaning medium used for cleaning the workpieces has a temperature of up to about 6O ⁰ C to 90 ⁰ C. As a result of a cleaning process, therefore, it comes to heating of the workpieces to be cleaned. If, after completion of a washing process, air is blown into the cleaning chamber for drying the cleaned workpieces, the air introduced into the cleaning chamber heats up on the cleaned and still warm workpieces. The drying air heated on the warm workpieces is sucked out of the cleaning chamber and fed back into the still heated state of the cleaning chamber for charging the cleaned and still to be dried workpieces via the closed flow circuit. As a result of the use of heated air instead of cold, supplied from the outside into the cleaning chamber air results in an overall much shorter drying process.

In the closed flow circuit for guiding the drying air, a condenser is integrated in an advantageous manner, which serves to dehumidify the drying air taken from the cleaning chamber. As the drying time progresses, the drying air carried in the closed circuit becomes drier.

According to a further feature of the invention, a storage container for the cleaning medium is arranged below the cleaning chamber. The formation of the reservoir for the cleaning medium below the cleaning chamber has the particular advantage that an overall compact design of the entire device can be achieved. As a cleaning medium, for example, a water-based liquor is used, which is in the form of a one- or two-component cleaner (surfactant, Boilda) in liquid form. For introducing the cleaning medium into the cleaning chamber is a pump system that promotes the cleaning medium from the reservoir into the cleaning chamber disposed within the cleaning arms, where it is then sprayed by means of the cleaning arms respectively arranged nozzles on the workpieces to be cleaned. The reservoir for the cleaning medium is preferably formed divided into two areas. The sprayed onto the workpieces to be cleaned cleaning medium drips from these, is collected within the cleaning chamber and returned to the reservoir, wherein the return of the already used and so far polluted cleaning medium into the reservoir into the same area takes place. The return of the already used cleaning medium in the one area of the reservoir takes place with the interposition of a return filter, as a result, the recycled cleaning medium cleaned, that is freed from dirt particles. The area of the storage container in which the cleaning medium already used for cleaning can be returned can also be referred to as the "dirty" area, and within the "dirty" area of the storage container there is also provided a means for de-oiling the returned cleaning medium, which serves to wash off the detergent washed off and into the reservoir with introduced oil.

The cleaning medium freed of dirt particles and oil residues is then transferred to the other area of the storage container, which may also be referred to as a "clean" area Within the "clean" area of the storage container is a heater for heating the cleaning medium to the desired temperature of, for example 60 ⁰ C to 8O ⁰ C. The cleaned, de-oiled and brought back to temperature cleaning medium can then be used again to be used in the cleaning chamber for cleaning the workpieces arranged therein. For this purpose, the previously mentioned pump system is provided, which conveys the processed and located in the "clean" area of the storage chamber cleaning medium in the cleaning chamber disposed within the cleaning arms.

The device according to the invention can not be operated only with a cleaning medium. Preferably, rather two cleaning media are used, which can be used optionally. For this reason, the device according to the invention has two storage containers, namely a first storage container for the first Cleaning medium and a second reservoir for the second cleaning medium. Both reservoirs are formed in the manner described above divided into two areas and arranged below the cleaning chamber. The cleaning media used are, in particular, one-component or two-component cleaners in liquid form, which have, for example, a different pH. The available cleaning media can optionally be used, that is, a first cleaning cycle is driven with the first cleaning medium, whereas a second cleaning cycle is run with the second cleaning medium. Of course, the two cleaning media can also be used alternately within a cleaning cycle. Needless to say, it is also conceivable to use more than just two cleaning media.

According to a further particular feature of the invention it is provided that the workpieces to be cleaned relative to the cleaning means, that is, the cleaning arms movable, preferably are pivotable within the cleaning chamber can be arranged. For this purpose, it is provided that a movably arranged charge carrier is positioned within the cleaning chamber. The batch carrier can be pivoted, for example, by a Pleulanlenkung in a horizontal plane, preferably at an angle of 15 °. As a result of this possible pivoting movement of the batch carrier, the workpieces parked thereon and combined into a batch workpieces can be moved relative to the cleaning devices, wherein preferably a pivoting movement takes place. The movable to the cleaning device arrangement of the workpieces to be cleaned in particular has the advantage that even complicated workpiece geometries can be cleaned reliably and as desired.

A pivoting movement of the workpiece to be cleaned receiving batch carrier by 15 ° is preferred because it ensures that the parked on the batch carrier and to be cleaned workpieces do not slip unintentionally due to a pivoting movement of the batch carrier. It follows that, depending on the stacking of the workpieces to be cleaned on the batch carrier and other pivoting angle are possible. In any case, but to ensure that due to the pivoting movement of Batch carrier does not accidentally slip on it and to be cleaned workpieces.

The device according to the invention for cleaning metallic workpieces is a washing machine for aqueous cleaning of metallic workpieces, which is carried out in advance and / or following a workpiece heat treatment. The inventive device is designed as a single-chamber compact and modular and is preferably made of stainless steel. It can be easily integrated into existing heat treatment systems.

The device according to the invention can be operated in three ways: spraying, flooding and / or spraying with subsequent flooding.

In the spraying operation, the workpieces to be cleaned are cleaned by spraying the cleaning medium. The sprayed onto the workpieces cleaning medium drips from these and is returned via a return from the cleaning chamber in the reservoir. When flooding the return for the cleaning medium from the cleaning chamber is closed in the reservoir. The sprayed onto the workpieces to be cleaned cleaning medium thus accumulates within the cleaning chamber until they are completely flooded and the workpieces to be cleaned quasi immersed in the cleaning medium located in the cleaning chamber. After a flooding of the cleaning chamber, the supply of cleaning medium via the rotatably arranged cleaning arms is stopped. A supply of cleaning medium is then only by the preferably fixed and below the workpieces to be cleaned within the cleaning chamber arranged cleaning device instead. Dirt particles and oils are carried upwards by means of the cleaning device arranged below the workpieces and collect on the surface of the cleaning medium standing in the cleaning chamber. The so driven up pollutions and oil spills are removed and disposed of by means of a skimmer. After completion of the cleaning, the return line for the cleaning medium from the cleaning chamber is opened again in the reservoir and the cleaning medium flows back from the cleaning chamber the reservoir. The device according to the invention can also be used in a combined manner, for example by carrying out a kind of pre-cleaning by pure spraying and a main cleaning by flooding.

According to a preferred embodiment, the device according to the invention is operated with two cleaning media separated from one another. The workpieces to be cleaned and combined into a batch are introduced into the cleaning chamber of the cleaning device according to the invention by means of corresponding workpiece baskets. The cleaning medium is irradiated from the storage containers into the cleaning chamber via the rotating nozzle system designed for the standard batch dimensions until the cleaning chamber has been completely filled. The irradiation of the cleaning medium is carried out at a pressure of about 2 bar to 5 bar, preferably at a pressure of about 3 bar to 4 bar. This process has the distinct advantage that an optimized pre-cleaning is achieved by the enormous input of kinetic energy by the irradiation of the cleaning medium in the cleaning chamber firmly adhering to the workpieces to be cleaned adhering organic and inorganic contaminants.

After a complete filling of the cleaning chamber with the cleaning medium, the further energy input for cleaning the adhering to the workpieces to be cleaned impurities happens on the one hand by the below the workpieces to be cleaned within the cleaning chamber arranged third cleaning device and on the other hand by a pivoting movement of the workpieces to be cleaned, thereby realizing in that the charge carrier receiving the workpieces to be cleaned is designed to be movable relative to the cleaning medium in the cleaning chamber. In the flooded state of the cleaning chamber, a further energy input can be achieved by blowing compressed air into it from below the cleaning chamber. The injected into the cleaning chamber compressed air causes a kind of pearl effect, which arises due to the entry of compressed air bubbles that rise in the flooded with cleaning medium cleaning chamber inside the cleaning medium up and thereby entrain adhering to the workpieces to be cleaned impurities that thereby to the surface of in the Cleaning chamber standing cleaning medium out and be foamed there.

An even better cleaning is achieved by a flood and spray cleaning on the use of another cleaning medium. A uniform and fast drying is finally ensured via an air pressure channel.

Preferably, a freely programmable controller takes over all the processes of the system. The system is also preferably equipped with a leak detection probe in the floor pan and with overflow protection for each reservoir.

The device according to the invention is advantageous in particular for the following reasons:

Two or more separate cleaning media can be used;

With the cleaning media used can be sprayed on the one hand and on the other hand, the cleaning chamber to be flooded; for which purpose two cleaning arms, also called nozzle sticks, are used, which rotate preferably reversibly about the workpieces to be cleaned and packed into a batch;

There is also a further cleaning arm, that is, nozzle assembly for use, which is preferably arranged fixed below the workpieces to be cleaned within the cleaning chamber, so that the workpieces to be cleaned or the workpiece charge can be achieved on all sides;

There is a washing support with the help of below the charge in the cleaning medium flooded cleaning chamber introduced air instead, which is caused by the fact that the introduced air causes a pearl effect; The workpieces to be cleaned are arranged movably within the cleaning chamber by means of a rocking or tilting device, whereby with respect to the horizontal a gift in both directions of 15 ° is possible, whereby a still further improved cleaning effect can be achieved;

The emptying of the cleaning chamber flooded with a cleaning medium can be carried out with simultaneous spraying of the workpieces, the so-called wet in wet cleaning;

Drying of the cleaned batches takes place by means of high-pressure blowing, wherein the drying air is conducted in a closed circuit with condensation of the chamber air;

There is a de-oiling and treatment of the cleaning media within the device of the invention, for which purpose preferably integrated Koalisierplattenöler and baffles are used, which are located within the arranged below the cleaning chamber reservoir;

The entire device is programmatically controlled, so that selectable wash programs are available and beyond an automatic level control and overflow monitoring of the reservoir is possible;

All cleaning medium-carrying parts are made of stainless steel and are therefore not susceptible to corrosion.

Further features and advantages of the invention will become apparent from the following description with reference to FIGS. Showing:

1 shows the device according to the invention in a schematic side sectional view. Fig. 2, the cleaning chamber of the device according to the invention in a sectional view from above and

Fig. 3, the cleaning chamber of the device according to the invention in a schematic view from the front.

Fig. 1 shows a schematic sectional view of the device 1 according to the invention for cleaning of metallic workpieces 2, which may also be referred to as a so-called washing machine or washer. The device 1 according to the invention operates under atmospheric conditions. In this respect, the device 1 according to the invention is an atmospheric scrubber.

The inventive device 1 has a cleaning chamber 4. The cleaning chamber 4 is formed closed on all sides and has a closable with a door 14 opening 15 through which the cleaning chamber 4 can be equipped with to be cleaned workpieces 2. The workpieces 2 to be cleaned are preferably combined to form a charge 3. For example, the workpieces may be received by batch baskets stacked to form the batch 3. In the Fign. 1 to 3, the charge 3 is shown schematically in the form of a rectangle provided with a cross.

Below the cleaning chamber 4 are two storage containers, wherein in the side sectional view of FIG. 1, only the front in the drawing plane reservoir 11 can be seen. In the storage tanks are cleaning media, such as aqueous lye, wherein the one reservoir receives a first cleaning medium and the other reservoir a second cleaning medium. 1, the cleaning medium 5 is located in the reservoir 11 to be recognized in the representation according to FIG.

The reservoirs are formed divided into two areas. The storage container 11 to be recognized according to FIG. 1 has a first region 12 and a second region 13. The first region 12 of the storage container 11 can be referred to as a "Clean" area, whereas the second area 12 of the reservoir 11 represents the "dirty" area.

Within the first region 12 of the reservoir 11, a heater 16 is provided for heating the cleaning medium therein.

The second region 13 of the reservoir 11 has a device for oil separation 17 and a return filter 18th

Within the cleaning chamber 4, a total of three cleaning devices are arranged, which are each designed as cleaning arms 6, 7 and 8. The first and the second cleaning arm 6 and 7 are formed substantially L-shaped and rotatably disposed within the cleaning chamber 4. The third cleaning arm 8 is arranged below the workpieces 2 to be cleaned within the cleaning chamber 4 and has a substantially elongated shape.

All cleaning arms 6, 7 and 8 are provided with nozzles 9, through which a cleaning medium can be sprayed onto the workpieces 2 to be cleaned, as shown in the illustration of FIG. 1 by dotted lines. In the illustrated embodiment according to FIG. 1, the cleaning medium 5 stored in the storage container 11 is applied to the workpieces to be cleaned by means of spraying via the nozzles 9.

The first and the second cleaning arm 6 and 7 are each arranged to be rotatable relative to the workpieces 2 to be cleaned within the treatment chamber 4. The drive of the cleaning arms 6 and 7 by means of a motor 19, wherein the cleaning arms rotate about the axes of rotation 20 and 21 respectively. The power transmission from the motor 19 to the two cleaning arms 6 and 7, for example, by means of a respective toothed belt 22 and 23rd

The two cleaning arms 6 and 7 are preferably reversibly arranged rotatable, as can be seen from the illustration of FIG. Are the two cleaning arms 6 and 7 in a rotary motion, so describe their the respective rotational axis 20 and 21 opposite end points 24 and 25, a part-circular path 26 and 27th

The third Reiπigungsarm 8, which is arranged below the workpieces 2 to be cleaned within the cleaning chamber 4, is preferably formed stationary, as can be seen in particular from Fig. 1. Of course, it is also possible to form the third cleaning arm relatively movable to the workpieces 2 to be cleaned.

The batch support 28 is formed by means of a Pleulantriebes 29 in the horizontal, that is pivotable with respect to the plane of the drawing of FIG. 3, wherein a pivoting movement in both directions A and B by an angle α or ß is possible. The pivot angle α or ß is preferably 15 °, but may also be greater depending on the workpieces 2 to be cleaned.

For the purpose of drying cleaned workpieces 2, the device 1 according to the invention has an air supply system 10. The air supply system 10 represents a closed circuit, wherein the air used for drying can be sucked out of the interior of the cleaning chamber 4 and passed through a condenser 30 for dehumidification. About the connecting piece 31, the air is introduced into the cleaning chamber 4. For air guidance within the cleaning chamber 4 serve manifolds 32, which have nozzle-shaped outlet openings 33. Via the outlet openings 33, the drying air reaches the already cleaned and still to be dried workpieces 2, as can be seen in Fig. 2 on the basis of the schematically drawn air cone 34. The air supply system 10 has two circuits, a first circuit for discharging the workpieces by sucking the air from the cleaning chamber 4 and re-injecting through the nozzles and a second circuit for condensing in the condenser 30 by sucking the air from the cleaning chamber 4 through the condenser 30 with likewise taking in dry air. The introduced into the cleaning chamber 4 cleaning medium is returned via a return line in the reservoir 1 1. The return line 35 is connected to the reservoir side to the previously described return filter 18. The return line 35 can be locked by means of a slider 36.

The cleaning chamber 4 is further connected to an overflow line 37, which is likewise connected at one end to the previously described return filter 18, as shown in FIG. 1.

The operation of the device 1 according to the invention is the following:

The located in the "clean" area 12 of the reservoir 1 1 cleaning medium 5 is heated by the heater 16, for example, to a temperature of 60 ⁰ C to 80 ⁰ C. Once the cleaning medium 5 has reached the desired temperature, this is by means of a preferably formed as a submersible pump pump 38 in the cleaning chamber 6 disposed within the cleaning arms 6, 7 and 8 promoted.

The conveyed to the cleaning arms 6, 7 and 8 cleaning medium 5 exits from the nozzles 9 of the cleaning arms 6, 7 and 8 and is under a pressure of about 2 bar to 5 bar, preferably about 3 bar to 4 bar on the cleaning workpieces 2 sprayed on. During this Aufsprühvorganges the first cleaning arm 6 and the second cleaning arm 7 are reversibly moved around the workpieces 2 to be cleaned around, as can be seen from Fig. 2. The cleaning arms 6 and 7 rotate about the axes of rotation 20 and 21 and are driven by the motor 19.

The sprayed onto the workpieces 2 to be cleaned 2 cleaning medium rips the adhering dirt and oil residue with it and accumulates in the lower part of the cleaning chamber 4, from where it comes back via the return 35 in the "dirty" area 13 of the reservoir 1 1 , The cleaning medium provided with contaminants passes into the "dirty" area 13 of the storage container 11, passing dirt filter particles through the cleaning filter 18. The de-oiling device 17 arranged inside the "dirty" area 13 of the storage container 11 is replaced by the cleaning chamber 4 in the reservoir 11 flowing back cleaning medium 5 de-oiled.

The filtered and de-oiled cleaning medium 5 then passes from the "dirty" area 13 of the reservoir 11 in the "clean" area 12 of the reservoir 11, where it can be reheated by the heater 16 and performed in the manner described in the spray chamber 4.

The spraying of the workpieces 2 to be cleaned with the cleaning medium 5 may be referred to as so-called pre-cleaning. Once the pre-cleaning is completed, the return line 35 is closed by means of the slider 36 therein, so that the cleaning medium 5 can not flow back into the "dirty" area 13 of the reservoir 11.

Due to the blocking of the return line 35 through the slider 36, the cleaning chamber 4 is flooded with the cleaning medium 5. During the flooding process or after completion of the same, the first cleaning arm 6 and the second cleaning arm 7 are turned off. The cleaning medium 5 then only exits from the third cleaning arm 8 arranged below the workpieces 2 to be cleaned within the cleaning chamber.

The effluent from the third cleaning arm 8 cleaning medium 5 rinses due to the flooding of the cleaning chamber 4 from the workpieces to be cleaned 2 removing contaminants upwards, where they accumulate on the liquid surface 39 of standing in the cleaning chamber 4 cleaning medium 5. Above the liquid surface 39 are located near the door more outlet nozzles 40 for the cleaning medium 5, which impinges by means of the outlet nozzles 15 at a preferably adjustable angle to the liquid surface 39 of standing in the cleaning chamber 4 cleaning medium 5. The accumulating on the Fiüssigkeitsoberfläche 39 dirt is by the obliquely from the Outlet nozzles 40 liquid medium 5 striking the surface 39 with respect to the plane of the drawing of Fig. 1 to the right in the direction of the overflow line 37 washed up. The so abgeschwemmten or foamed soils then pass through the overflow line 37 and the cleaning filter 18 in the "dirty" area 13 of the reservoir 11th

In the flooded state of the cleaning chamber 4, a detachment of adhering to the workpieces 2 to be cleaned dirt can be further improved by the fact that below the workpieces 2 compressed air is introduced into the flooded with the cleaning medium 5 cleaning chamber 4. The air bubbles passing past the workpieces 2 to be cleaned as a result of the compressed air introduction cause a kind of pearl effect, whereby a complete detachment of all dirt adhering to the workpieces 2 can be achieved in a considerably shortened time. The introduction of compressed air also has the advantage that the dirt particles to be cleaned from the workpieces 2 to be cleaned can be flushed much faster to the liquid surface 39, where they can then be skimmed by means of the above-described skimmer and disposed of by means of the overflow line 37.

After completion of the cleaning cycle, the return line 35 is opened by opening the slide 36 again and the cleaning chamber 4 emptied by expiration of the cleaning medium 5 in the "dirty" area 13 of the storage chamber 11 again.

During the emptying process of the cleaning chamber 4 and / or after completion of the emptying process of the cleaning chamber 4, the workpieces 2 can be sprayed again by means of all cleaning arms 6, 7 and 8.

After a successful cleaning of the workpieces 2 they are dried by means of the already described air supply system 10. Once the drying process is completed, the cleaning chamber 4 closing door 15 can be opened and the cleaned and dried workpieces 2 of the cleaning chamber 4 are removed.

LIST OF REFERENCES

1 device 31 connecting piece

2 workpiece 32 distributor tube

3 charge 33 opening

Cleaning chamber 34 air cone

Cleaning medium 35 Return line, first cleaning arm 36 Slide, second cleaning arm 37 Overflow line, third cleaning arm 38 Pump

Nozzle 39 Liquid surface 0 Air supply system 40 Outlet nozzle 1 Reservoir 2 first area 3 Second area A Direction 4 Door B Direction 5 Penetration α Angle 6 Heating ß Angle 7 Oil separation 8 Return filter 9 Motor 0 Rotary axis 1 Rotary axis 2 Timing belt 3 Timing belt 4 End point 5 End point 6 Partial circular path 7 part-circular path 8 Batch support 9 Pleulantrieb 0 Condenser

Claims

1. A device for cleaning metallic workpieces (2) with a cleaning chamber (4) for receiving the workpieces to be cleaned (2), wherein in the cleaning chamber (4) relative to the workpieces to be cleaned (2) movable cleaning device for introducing a Cleaning medium (5) in the cleaning chamber (4) is arranged, characterized by a further within the cleaning chamber (4) relative to the workpieces to be cleaned (2) movably arranged cleaning device.

2. Apparatus according to claim 1, characterized in that the cleaning devices are each formed as a cleaning arms (6, 7).

3. Apparatus according to claim 2, characterized in that the cleaning arms (6, 7) nozzles (9) for the cleaning medium (5).

4. Apparatus according to claim 2 or 3, characterized in that the cleaning arms (6, 7) are arranged in each case relative to the workpieces to be cleaned (2) rotatable within the cleaning chamber (4).

5. Apparatus according to claim 2, 3 or 4, characterized in that the cleaning arms (6, 7) reversibly rotatable within the cleaning chamber (4) are arranged.

6. Device according to one of the preceding claims, characterized by a further, preferably in the form of a cleaning arm (8) formed cleaning device, which is disposed within the cleaning chamber (4) below the workpieces to be cleaned (2).

7. Device according to one of the preceding claims, characterized by an air supply system (10) for blowing air into the cleaning chamber (4).

8. Device according to one of the preceding claims, characterized by a below the cleaning chamber (4) arranged reservoir (11) for the cleaning medium.

9. Apparatus according to claim 8, characterized in that the storage container (11) in two areas (12, 13) is formed divided.

10. Device according to one of the preceding claims, characterized in that the workpieces to be cleaned (2) relative to the cleaning means movable, preferably pivotable within the cleaning chamber (4) can be arranged.