DE20120754U1 - Suction device, in particular for housing-like casing of machine tools - Google Patents

Description

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Raimund Rerucha G 6535.0-kr

Maierwaldstr. 6

70499 Stuttgart

Patent attorneys A. K Jackiscii-Kohi and KH Kohl

Stuttgart sir. 115 - 7046Θ Stuttgart

Extraction device, especially for housing-type enclosures for machine tools

The invention relates to a suction device, in particular for housing-like casings of machine tools, according to the preamble of claim 1.

Extraction devices are known that are provided on the housing-like casings of machine tools. While the machine tool is in operation, the extraction device constantly extracts air from the interior of the casing. As a rule, the cutting speeds of the machine tools are high, which means that when the workpieces are being machined, chips are distributed throughout the entire working area of the casing and are thrown to the extraction point and extracted. Chip residues in the extraction area, for example in the extraction pipe, lead to the formation of chip nests, which represent a high safety risk.

The invention is based on the object of designing the generic extraction device in such a way that undesirable components in the extracted air do not enter the extraction system.

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This object is achieved in the generic suction device according to the invention with the characterizing features of claim 1.

In the suction device according to the invention, the collecting unit prevents undesirable components in the extracted medium from entering the suction system. The undesirable components are intercepted at the collecting unit. Since the collecting unit is permeable to air, the suction itself is not impaired.

In a design according to claim 10, the collecting unit is located in the area of action of at least one cleaning unit. This can be used to free the collecting unit of stuck components that must not be vacuumed away. Since the cleaning unit is provided on the suction device, manual cleaning of the collecting unit is not necessary. As a result, the suction device according to the invention can also be installed where manual cleaning of the collecting unit is not necessary or only necessary with great effort. The suction device is often located at a great height, so that aids such as ladders are required to clean the collecting unit. If the suction device is provided on a casing for a machine tool, the machine tool must be shut down while the collecting unit is being cleaned. With the suction device according to the invention, the collecting unit can also be cleaned while the machine tool is in use.

In a further embodiment, the suction nozzle of the suction device according to the invention is provided with the counter-form-locking element, which interacts with the form-locking element of the clamping ring. It sits on the suction hose and is inserted into the suction nozzle, against whose inner wall it rests under tension. The form-locking connection enables a simple and reliable

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This ensures that the suction hose cannot be accidentally pulled out of the suction nozzle.

The suction device according to the invention is characterized in that it has three interfaces that can be arranged close to one another so that the suction device has a compact design. The first interface is formed by the collecting unit, which is located in front of the suction point in the suction direction. The second interface is formed by the cleaning unit, with which the collecting unit can be cleaned of the trapped particles in the extracted air if necessary. Finally, the third interface is formed by the suction nozzle, to which a flexible suction hose can be easily connected.

It is particularly advantageous if the extraction device is installed in a removable manner. It can then be easily dismantled if necessary, for example to carry out servicing.

Further features of the invention emerge from the further claims, the description and the drawings.

The invention is explained in more detail using an embodiment shown in the drawings.

Fig. 1 in perspective view an inventive

Extraction device,

Fig. 2 is a plan view of the suction device according to Fig. 1,

Fig. 3 is a view in the direction of arrow III in Fig. 2,

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Fig. 4 shows a schematic representation of the end of a hose,

which is to be connected to the suction nozzle of the suction device,

Fig. 5 shows an axial section of one end of the suction nozzle.

The suction device is used in casings for machine tools. Such machine tools are, for example, production centers that are arranged within a housing-like casing. The suction device is switched on at least while workpieces are being processed on the machine. The casing is indicated in Fig. 1 and 3 by profile parts 1. The casing naturally has closed side walls and a closed ceiling. To accommodate the suction device, the casing 1 is provided with a corresponding installation opening 2, which can be provided in the side wall and/or in the corner of the casing.

The extraction device has a mounting frame 3, which in the embodiment has a square outline, but can of course have any other suitable outline. The frame sides 4 to 7 have an edge 8 to 11 that is bent outwards at a right angle, with which the mounting frame 3 overlaps the edge of the installation opening 2. With these angled edges 8 to 11, the mounting frame 3 rests on the outside of the side wall or ceiling of the housing-like casing 1.

The frame sides 4 to 7 extend at right angles from a base plate 12 which is recessed relative to the angled edges 8 to 11 of the frame sides 4 to 7.

To ensure that the installation frame 3 can be easily installed and removed if necessary, it is attached to two opposite

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Frame sides 4, 6 are each provided with an upwardly projecting handle 13, 14 which is suitably attached to the corresponding frame sides.

The base plate 12 preferably has a central opening 15 to which a suction nozzle 16 is connected. It has a circular cross-section and rests on the base plate 12 with an annular flange 17. The annular flange 17 is fastened to the edge of the opening 15 on the base plate 12 with screws and the like.

In the area below the suction nozzle 16 there is a chip basket 18 made of a wire or plastic mesh. The chip basket 18 has side walls 19 to 21 that adjoin one another at right angles and a base 22 that connects the side walls 19 to 21 to one another. The side walls 19 to 21 extend to the base plate 12, to the inside of which they are attached in a suitable manner. The chip basket 18 serves to catch the chips that are generated and extracted in the working area of the casing when machining workpieces with the machine tool, so that they cannot get into the suction nozzle 16. The chips get caught on the outside of the chip basket 18, the mesh of which is so fine that the chips cannot get through. In order to at least largely compensate for the loss of cross-section caused by the fabric of the chip basket 18, it is designed as described as a hood with four side walls and a base, so that the air can enter on five sides of the chip basket 18. The air resistance is therefore only about 20 Pa at most. Since the workpiece chips are prevented from being sucked into the extraction system, no deposits occur in a hose connected to the extraction nozzle 16. This reliably prevents damage to the extraction system without this being associated with increased air resistance at the extraction point.

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In order to be able to easily remove the chips located on the outside of the chip basket 18 from the chip basket 18, the suction device is provided with at least one cleaning unit 23. It has a cleaning nozzle 24 that projects into the chip basket 18 and is provided with nozzle openings (not shown) through which a cleaning agent emerges in a manner to be described below. The cleaning nozzle 24 is mounted so as to be rotatable about its axis 25 (Fig. 3) in a holder 26 that projects through the base plate 12 and is attached to it. The cleaning unit 23 is provided in the area between the suction nozzle 16 and a corner area of the base plate 12. The axis of rotation 25 of the cleaning nozzle 24 is perpendicular to the base plate 12.

A supply line 27 is connected to the holder 26, through which the cleaning medium, preferably cooling lubricant, is supplied. A solenoid valve 28 is located in the supply line 27, with which the supply of the cleaning medium is controlled. The solenoid valve 28 is electrically controlled in order to open or close the supply line 27. Instead of the solenoid valve 28, a manually operated valve can also be provided, for example.

As soon as a cleaning process is to be carried out, the solenoid valve 28 is actuated and the feed line 27 is opened. This allows the cleaning medium to be fed to the cleaning unit 23. Under the pressure of the supplied cleaning medium, which enters the cleaning nozzle 24 via the holder 26, the latter is rotated about its axis 25. The cleaning medium exits through the nozzle openings provided at the lower end of the cleaning nozzle 24 and is thrown against the side walls 19 to 21 and the base 22 of the chip basket 18. The cleaning medium, which hits the side walls 19 to 21 and the base 22 of the chip basket 18 from the inside, causes the chips adhering to it to be thrown back inwards into the machine casing.

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Depending on the size of the chip basket 18, it is possible to provide more than one cleaning unit 23.

The cleaning unit 23 can be used to rinse the side walls 19 to 21 and the base 22 of the chip basket 18, so that the chip basket 18 is reliably prevented from becoming clogged by the chips produced during workpiece processing. No personnel are required to clean the chip basket 18, since the chip basket 18 can be cleaned automatically in the manner described. Even if the casing of the machine tool is high and the suction device is mounted on the ceiling of the casing, reliable cleaning of the chip basket 18 is guaranteed. Since the chip basket 18 is cleaned without personnel, the machine tool located in the casing does not have to be shut down for the cleaning process. The chip basket 18 can be cleaned optimally as soon as the suction power/effectiveness decreases. In this way, a consistent suction performance/effect is ensured with a constant negative pressure in the working area within the casing of the machine tool. The cleaning medium, in particular the coolant lubricant, does not leak into the machine environment, so that there is no atmosphere in the area surrounding the casing that is hazardous to health.

Since the installation frame 3 of the extraction device is formed by angle profile parts, it can be easily attached to and removed from the casing 1, in particular due to the two handles 13 and 14. This is a great advantage for service purposes and for any possible conversion. Due to the design described, the extraction device has three interfaces, namely for the chip basket 18, for the cleaning unit 23 and the extraction nozzle 16. These three interfaces are provided on the extraction device in a space-saving manner.

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In Figs. 1 and 3, a conventional suction nozzle 16 is provided, which is connected to a suction pipe in a known manner.

Fig. 4 and 5 show a suction nozzle 16 to which a flexible hose 29 can be easily connected. A clamping ring 31 is attached to the connection end 34 of the hose 29. The clamping ring is designed as a spring ring and is provided with a slot 32 to achieve the spring properties. The clamping ring 31 is surrounded by a clamping device 33, which can be designed as a hose clamp, for example.

In order to prevent the clamping ring 31 from slipping on the hose 29, it is advantageously designed so that it sits on the hose end 34 with a high clamping force. It is of course also possible to connect the clamping ring 31 firmly to the hose end 34.

Advantageously, the end 35 of the clamping ring 31 facing the intake port 16 is flanged inwards in a U-shape. This has the advantage that the hose end 34 can be very easily inserted into the clamping ring 31 until the free hose end rests on the base 41 of the flange 35. In this way, it is ensured that the hose end 34 is pushed sufficiently far into the clamping ring 31.

Near the free end, at least one form-locking element 36 is attached to the clamping ring 31, which in the embodiment is a ring that is approximately semicircular in cross-section and is interrupted in the area of the slot 32. This form-locking element 36 is advantageously a metal ring that is welded onto the outer surface of the clamping ring 31. The form-locking element 36 does not have to be designed as a ring. It can also be made of one-

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individual sections spaced apart from one another in the circumferential direction of the clamping ring 31. The form-locking element

36 serves to hold the hose 29 axially firmly in the suction nozzle 16 in the installed position to a reliable extent. Accordingly, the form-locking element 36 is designed such that it can reliably perform this axial securing function.

Since in the preferred embodiment the form-locking element has a curved outer side in cross-section, it can be easily brought into the installation position when connecting the hose 29 to the suction nozzle 16.

The suction nozzle 16 points at a distance from its free front side

37 has a counter form-locking element 39 in its inner wall 38, into which the form-locking element 36 engages in a form-locking manner in the installed position of the hose 29. If the form-locking element 36 is a ring, the counter form-locking element 39 is designed as an annular groove in the inner wall

38 of the nozzle 16. The cross-sectional shape of the counter-form-locking element 39 is adapted to the cross-sectional shape of the form-locking element 36, so that the form-locking element in the installed position lies flat against the wall of the counter-form-locking element

39 is applied.

The clamping ring 31 is designed with respect to its outer diameter in such a way that it can only be inserted into the nozzle 16 in a compressed state. To do this, the clamping ring 31 is elastically compressed by means of the clamping device 33 to such an extent that it can be inserted into the nozzle 16 with the form-locking element 36. If the clamping device 33 is designed as a hose clamp, the clamping ring 31 can be continuously reduced to any required diameter. The clamping ring 31 is advantageously elastically compressed to such an extent that the form-locking element 36 rests against the inner wall 38 of the nozzle 16 during the insertion process. Then

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the hose end 34 can be easily pushed in until the form-locking element 36 is at the same height as the counter form-locking element 39. The clamping device 33 is then released again so that the clamping ring 31 is elastically expanded. The form-locking element 36 then moves into the counter form-locking element 39.

The clamping ring 31 is designed such that in the installed position it rests against the inner wall 38 of the nozzle 16 with high pressure. The slot 32 is so wide that the clamping ring 31 can be elastically compressed to a sufficient extent in order to insert it into the nozzle 16 together with the form-locking element 36.

In order to simplify the connection of the hose 29 to the nozzle 16, the clamping device 32 is advantageously attached to the clamping ring 31 in such a way that it then comes into contact with the front side 37 of the nozzle 16 when the form-locking element 36 is at the level of the counter-form-locking element 39. Then, during the assembly process, it is only necessary to loosen the clamping device 33 so that the form-locking element 36 reaches the counter-form-locking element 39 of the nozzle 16 as a result of the radial elastic expansion of the clamping ring 31. The clamping device 33 is advantageously completely loosened so that the clamping ring 31 rests against the inner wall 38 of the nozzle 16 with a high clamping force.

Since the hose 29 rests with its lower end 34 on the bottom 41 of the flange 35 of the clamping ring 31, the suctioned medium is reliably prevented from escaping through the slot 32. This design prevents the suctioned medium from escaping and backflow when the suction system is switched off.

In the described embodiment, the clamping force under which the clamping ring 31 on the inner wall 38 of the nozzle

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16, from the spring force of the clamping ring 31 itself. However, it is also possible to design the clamping ring 31 and the clamping device 33 in such a way that the clamping force can be adjusted in the installation position of the clamping ring 31. This is achieved by fastening the fastening device 33 to the clamping ring 31. If the clamping device 33 is actuated, the clamping ring 31 is inevitably expanded or compressed by the clamping device 33 as a result of the firm connection.

In the initial position, the clamping ring 31 with the form-locking element 36 is designed so that it can be inserted into the socket 16. In contrast to the previous embodiment, the clamping ring 32 is now expanded with the clamping device 33. The form-locking element 36 thus reaches the counter form-locking element 39. The clamping device 33 can thus be used to adapt the contact pressure under which the clamping ring 31 rests against the inner wall 38 of the socket 16 to the respective installation conditions. In particular, the contact pressure can be adjusted at any time.

The clamping device 33 is preferably designed as a hose clamp, in which the hose clamp can be widened or compressed in a known manner using a clamping screw 40. In the second embodiment described, the hose clamp 33 has its smallest diameter in the initial state. As soon as the clamping ring 31 is inserted into the nozzle 16, the hose clamp 33 is widened in a known manner by operating the adjusting screw 40. Since the clamping ring 31 is attached to the hose clamp 33, the clamping ring 31 is also widened accordingly.

In the first embodiment, in which the hose clamp is not firmly connected to the clamping ring 31, the hose

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clamp 33 has a correspondingly small diameter before inserting the clamping ring 31 into the nozzle 16. To secure the clamping ring 31 in the nozzle 16, the hose clamp 33 is then widened by operating the adjusting screw 40. The clamping ring 31 is also elastically widened accordingly.

The extraction device has been described using the casing of a machine tool. The extraction device can of course be used wherever extraction of rooms, equipment, other machines and the like is to be carried out.

Claims (31)

1. Suction device, in particular for housing-like casings of machine tools, with at least one suction point, preferably a suction nozzle which is fastened to a mounting frame, characterized in that the suction device has at least one air-permeable collecting unit ( 18 ) in the suction area in front of the suction point ( 16 ). 2. Suction device according to claim 1, characterized in that the collecting unit ( 18 ) is a basket with side walls ( 19 to 21 ), of which at least one side wall, preferably all side walls, is designed like a fabric. 3. Suction device according to claim 2, characterized in that the side walls ( 19 to 21 ) of the collecting unit ( 18 ) are connected by a base ( 22 ). 4. Suction device according to claim 3, characterized in that the base ( 22 ) is at least partially fabric-like. 5. Suction device according to one of claims 1 to 4, characterized in that the collecting unit ( 18 ) is fastened to the installation frame ( 3 ). 6. Suction device according to one of claims 1 to 5, characterized in that the installation frame ( 3 ) is provided with at least one handle ( 13 , 14 ). 7. Suction device according to claim 6, characterized in that the handle ( 13 , 14 ) projects transversely from the installation frame ( 3 ). 8. Suction device according to claim 6 or 7, characterized in that the installation frame ( 3 ) is provided with a handle ( 13 , 14 ) on each of the opposite frame sides ( 4 , 6 ). 9. Extraction device according to one of claims 1 to 8, characterized in that the installation frame ( 3 ) with outwardly angled edges ( 8 to 11 ) of its frame sides ( 4 to 7 ) overlaps the edge of an installation opening. 10. Suction device, in particular according to one of claims 1 to 9, characterized in that the collecting unit ( 18 ) is located in the effective range of at least one cleaning unit ( 23 ) for the collecting unit ( 18 ). 11. Suction device according to claim 10, characterized in that the cleaning unit ( 23 ) projects into the collecting unit ( 18 ). 12. Suction device according to claim 10 or 11, characterized in that the cleaning unit ( 23 ) has at least one cleaning nozzle ( 24 ). 13. Suction device according to claim 12, characterized in that the cleaning nozzle ( 24 ) is rotatable about its axis ( 25 ). 14. Suction device according to one of claims 10 to 13, characterized in that the cleaning unit ( 23 ) is arranged in the region between the suction nozzle ( 16 ) and the edge of the installation space ( 3 ). 15. Suction device according to one of claims 12 to 14, characterized in that the cleaning nozzle ( 24 ) is connected to a supply line ( 27 ) for a cleaning medium. 16. Suction device according to claim 15, characterized in that a valve ( 28 ) is located in the supply line ( 27 ). 17. Suction device, in particular according to one of claims 1 to 16, characterized in that the suction nozzle ( 16 ) is provided with at least one counter-form-locking element ( 39 ) for at least one form-locking element ( 36 ) which projects beyond the outer casing of a clamping ring ( 31 ) which sits on a suction hose ( 29 ) and rests under tension against the inner wall ( 38 ) of the suction nozzle ( 16 ). 18. Suction device according to claim 17, characterized in that the form-fitting element ( 36 ) is annular and is fastened to the clamping ring ( 31 ). 19. Suction device according to claim 17 or 18, characterized in that the form-locking element ( 36 ) consists of metal. 20. Suction device according to one of claims 17 to 19, characterized in that the form-fitting element ( 36 ) has a part-circular cross-section. 21. Suction device according to one of claims 17 to 20, characterized in that the counter-form-locking element ( 39 ) is a recess in the inner wall ( 38 ) of the suction nozzle ( 16 ). 22. Suction device according to claim 21, characterized in that the recess ( 39 ) is an annular groove. 23. Suction device according to one of claims 17 to 20, characterized in that the counter-form-locking element ( 39 ) is a radially outwardly deformed part of the suction nozzle ( 16 ). 24. Suction device according to one of claims 17 to 23, characterized in that the clamping ring ( 31 ) is slotted. 25. Suction device according to one of claims 17 to 24, characterized in that the clamping ring ( 4 ) rests against the inner wall ( 38 ) of the suction nozzle ( 16 ) under its own spring force. 26. Suction device according to one of claims 17 to 24, characterized in that the clamping ring ( 31 ) rests against the inner wall ( 38 ) of the suction nozzle ( 16 ) under radial pressure applied from the outside. 27. Suction device according to claim 26, characterized in that a pressure device ( 40 ) is seated on the clamping ring ( 31 ), with which the clamping ring ( 31 ) can be elastically expanded to rest on the inner wall ( 38 ) of the suction nozzle ( 16 ). 28. Suction device according to claim 27, characterized in that the pressure device ( 40 ) is a hose clamp which is fastened to the outer casing of the clamping ring ( 31 ). 29. Suction device according to one of claims 17 to 28, characterized in that the end ( 35 ) of the clamping ring ( 31 ) facing the suction nozzle ( 16 ) is flanged inwards. 30. Suction device according to claim 29, characterized in that the flange ( 35 ) is U-shaped in cross section. 31. Suction device according to claim 29 or 30, characterized in that the suction hose ( 29 ) rests on the bottom ( 41 ) of the flange ( 35 ).