JP2016094940A - Vacuum device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a connection part of an accessory unit to a vacuum device, especially to a vacuum pump.SOLUTION: A vacuum device 10, especially a vacuum pump, has at least one connection part 16 for an accessory unit 14, and a control device 12 for the accessory unit 14. The connection part 16 is formed so as to mechanically connect the accessory unit 14 to the vacuum device 10, and electrically and/or information-technically connect the accessory unit 14 to the control device 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vacuum apparatus having at least one connection for an accessory unit and a control device for the accessory unit. The invention further relates to a system comprising at least one vacuum device and at least one accessory unit for the vacuum device.

  A vacuum device having a control device, such as a turbomolecular pump or a pre-vacuum pump, typically has multiple connections to one or more accessory units. Examples for such accessory units are flood valves or shut-off valves and pressure sensors or temperature sensors. The accessory unit is mechanically connected to the vacuum device. The required electrical and / or information technology connection of the accessory unit to the control device is provided by one or more connection cables.

  Such a plurality of wirings requires an additional structure space due to a plurality of connection points, and includes an error source at the time of connection.

German utility model 20309441U1 specification

  Therefore, the subject of this invention is simplifying the connection part of the attachment unit with respect to a vacuum device, especially a vacuum pump.

  This object is achieved by means of a vacuum device having the features of claim 1, in particular for connecting the electrical and / or information of the accessory unit to the control device, also for the mechanical connection of the accessory unit with the vacuum device. It is solved by being formed for technical connection.

  According to the invention, it is no longer necessary to provide a separate cable from the accessory unit to the control device in order to connect the accessory unit to the control device. Thereby, for example, connection with an error based on an erroneous cable or an erroneous connection location is prevented. The present invention also allows the user to omit additional assembly steps for the cable. A further advantage of the present invention is that no additional structural space is required for cables traveling outside. In particular, in the case of an arrangement that is difficult to access, the connection of the accessory unit is simplified. Furthermore, there is no need to prepare a number of different cables, for example having different lengths and variously bent connection elements. In addition, complex cable insulation and mechanical safety devices such as strain relief (German: Zugenlastungen) can be omitted. A further advantage is that fewer or less connection points are required for connecting the accessory unit to the control device via a cable.

  The mechanical connection can be or include a bayonet connection. In this case, the connection for mechanical connection includes a sleeve element or a plug element as a mechanical connection organ. Therefore, the attachment of the accessory unit is further simplified.

  Further, the mechanical connection can be or include a screw connection. In this case, the connection part for mechanical connection includes at least one screw part as a mechanical connection organ. This ensures a simple and reliable machine connection.

  The screw connection includes a separate fixation organ for the accessory unit. This is in particular a fixed screw, or fixed screw opening. The advantage here is that the screw connection is thereby made particularly simple.

  The mechanical connection and the electrical and / or information technology connection can have one common connection axis, in particular a plug-in axis, a slide axis and / or a rotation axis. The mechanical connection and the electrical and / or information technology connection are basically configured to require only one installation operation, for example a simple plug-in or screw-in, for the attachment of the accessory unit. Is possible. Therefore, the attachment of the accessory unit is further simplified.

  Electrical and / or information technology connections can be invariant to rotation about the connection axis. The connection then functions technically at any angular position or at a finite angular position. Particularly in a limited structural space, the advantage here is that the attachment unit can be mounted more flexibly or for the first time.

  The connection for mechanical connection has at least one mechanical connection organ. In this case, at least one contact organ for electrical and / or information technology connection is provided at or close to the connection organ. The functionality of mechanical connections and electrical and / or information technology connections is thereby further integrated and simplified.

  The contact organ is an imaginary cylinder whose central axis coincides with a connection axis of mechanical connection and / or electrical and / or information technology connection, in particular an insertion axis, a slide axis and / or a rotation axis Can be provided on the peripheral side or on the front side.

  Furthermore, the contact organ is contacted in the radial or axial direction with respect to the connection axis of mechanical connection and / or electrical and / or information technology connection, in particular with respect to the plug-in axis, slide axis and / or rotation axis. It is formed and provided so that it can be.

  The contact organ can be provided in the form of a protrusion or a ridge, or it can be formed closed. Contact is thus simplified and improved. Furthermore, the contact organ can be formed in a ring shape. In a further form, the contact organ can be flexibly formed or provided. In particular, it can be elastically supported. This ensures a reliable and easy contact.

  A plurality of contact organs can be provided. These contact organs are oriented with respect to the connection axis, in particular the plug-in axis, the slide axis and / or the rotary axis, in mechanical connection and / or electrical and / or information technology connection, in particular in contact The organs can be provided distributed along and / or around the connecting axis.

  The contact organ is preferably spaced around the connection axis in the form of a plurality of coaxial rings with axially oriented contact surfaces, or along the connection, preferably with radially oriented contact surfaces It can be provided around the connecting shaft in the form of a plurality of rings with openings.

  Electrical and / or information technology connections can be formed in multi-channel and / or multi-functional manner. In particular, one contact organ is provided for each channel or for each function.

  One function or only one function of the connection can be an electrical power supply for the accessory unit. The information technology connection of the accessory unit to the control device can be made wireless and / or contactless. This can be done, for example, by radio, acoustic or optical transmission. Therefore, in the vacuum apparatus, the structure is simplified for the connection wiring. Another advantage is that the mechanical connection is likewise structurally simplified.

  The connecting part can have an interface part for at least one functional unit of the accessory unit, in particular a valve unit or a sensor unit. In this case, the interface part is preferably formed as a housing part, a penetrating part or an access opening for the functional unit. Thus, for example, the connection in a vacuum device can include a screw thread for a flood valve (German: Flutventil). In doing so, means for the electrical connection of the valve to the same location, in particular for supplying electrical energy and / or the transmission of signals from the valve to the control device and / or from the control device to the valve. Means are provided for this purpose.

  The control device is integrated in the housing of the vacuum device or is provided outside the housing of the vacuum device. In particular, the control device has its own housing.

  It is possible for one or more wirings for the connection of the connection to the control device to run at least partially and in particular at least essentially inside the housing of the vacuum device.

  According to another embodiment of the invention, the presence of an accessory unit, in particular its mechanical connection with a vacuum device, is detected, and the action, in particular the switching process, is performed or released only when the accessory unit is present. It is intended that a connection is formed.

  The object of the invention is further solved by a system comprising at least one vacuum device having a connection, at least one accessory unit having a connection, and a control device for the accessory unit. In this case, the connecting part performs both mechanical connection of the accessory unit to the vacuum device and electrical and / or information technology connection of the accessory unit to the control device.

  Such a system can be further improved by the above-described embodiments relating to the vacuum apparatus. In other words, the developed form can be correspondingly intended in the system according to the invention.

  Further embodiments of the invention are described in the dependent claims, the description and the drawings.

  The invention will now be described, by way of example only, with reference to the simplified drawings. The following is shown in the drawing.

Vacuum device and attached unit according to the present invention Implementation of the connection according to the invention The perspective view of the connection part of FIG. Alternative embodiments of the connection according to the invention 4 is another view of the connecting portion of FIG. The perspective view of another embodiment of the connecting part according to the present invention

  FIG. 1 shows a vacuum device 10 having a control device 12. The vacuum apparatus 10 has one connection portion 16. This connection portion is electrically and / or information-technically connected to the control device 12 via the wiring 32. The wiring 32 includes a plurality of individual wirings. These are assigned, for example, to one function or a signal channel or a communication channel. An attachment unit 14 is shown for the connection 16. The accessory unit 14 similarly has one connection part 17 on the side of the connection part 16, and a plurality of means in its parallel lined region. These means can cooperate with a connection 16 for mechanically connecting the accessory unit 14 to the vacuum device 10 and for electrically and / or information-technically connecting the accessory unit 14 to the control device 12. is there.

  The wiring 32 starts from the connection portion 16 and moves in the housing 11 of the vacuum device 10. However, it can also be fixedly mounted outside the housing 11 of the vacuum device 10, for example. Here, the control device 12 housed in its own housing 13 is attached outside the housing 11 of the vacuum device 10. This can alternatively be integrated inside the housing 11 of the vacuum device 10.

  The control device 12 is configured to control the attachment unit 14, which should be understood in the broadest sense. Control can be, for example, only supplying electrical energy to the accessory unit 14. As an alternative or in addition, for example, the control can include an information technology exchange (German: Austausch) between the control device 12 and the accessory unit 14. For example, the controller 12 can receive and / or evaluate sensor data of the sensors of the accessory unit 14.

  Within the control device 10 of FIG. 1, the connection 16 and / or the control device 12 can be configured to detect whether the accessory unit 14 is connected to the connection 16. This can be done, for example, by a key switch provided at the connection 16. This key switch is operated by the attached accessory unit 14 connected thereto. For example, the controller 12 can also be configured to detect the electrical internal resistance of the accessory unit 14 and to derive information from this regarding whether the accessory unit 14 is present at the connection 16.

  FIG. 2 shows an example of the connection portion 16 of the vacuum apparatus 10. The connection 16 is formed to mechanically connect the accessory unit 14 to the vacuum device 10 and to connect the accessory unit 14 to the control device 12 not shown here in an information technical manner.

  For mechanical connection, the connection 16 is provided with a hole 40 having an inner thread portion 22. The accessory unit 14 has one connection 17 having a cylinder 38 with an outer thread portion 24 on the side of the connection 16. Inner thread mountain portion 22 and outer thread portion 24 cooperate to ensure a mechanical connection. The cylinder 38 and the hole 40 are coaxially arranged around the connection shaft 26 in a mechanically connected state.

  For electrical and / or information technology connections, the connection 16 of the vacuum device 10 of FIG. 2 is provided with a plurality of contact periods 28 spaced radially from the connection shaft 26. . The contact organ 28 of the connection part 16 is here formed as a point contact part. These are electrically and / or information-technically connected to the control device 12 (not shown) via wirings 32 respectively. Similarly to the contact organ 28 of the connection part 16, a plurality of contact organs 28 are provided in the connection part 17 of the attachment unit 14. These are shown in the right figure. In this figure, the attached unit 14 in the center figure is shown tilted to the right. The contact organ 28 of the attachment unit 14 is formed as a coaxial ring surface. In the connected state, the contact organ 28 of the attachment unit 14 and the contact organ 28 of the connection portion 16 are in contact with each other. In this embodiment, the connected state is achieved when the cylinder 38 is screwed into the bore 40 until it stops or to the target position.

  The contact organ 28 of the attachment unit 14 is further formed as a continuous circular ring surface in FIG. They can contact the contact organ 28 of the connection 16 at any arbitrary angular position. Here, the contact organ 28 is configured in accordance with the principle of slip ring (German: Schleifling). The ring surface of the contact organ 28 of the attachment unit 14 can be provided only as a segment or over a partial angular area. The contact organ 28 of the attachment unit 14 is electrically and / or information-technically connected to a functional unit (not shown) of the attachment unit 14.

  Also shown on the right side of FIG. 2 is an access opening 30 formed as a central hole in the cylinder 38 of the accessory unit 18. In addition, the hole 40 in the left figure extends beyond the inner thread portion 22. This extends to the inside of the housing of the vacuum device 10 not shown. Thus, access of the functional unit of the accessory unit 14 through the access opening 30 to the interior of the housing of the vacuum device is guaranteed. This access can be used, for example, to measure the pressure inside the housing of the vacuum device 10 by means of a functional unit formed as a pressure sensor.

  FIG. 3 also shows the embodiment of FIG. 2 for better understanding, but is shown as a perspective view. The accessory unit 14 has a connection on its side of the connection 16 (not shown) having a plurality of contact organs 28, a cylinder and an access opening 30 formed as a central hole. When the cylinder 38 is screwed into the hole 40 of the vacuum apparatus 10 shown in FIG. 2, the contact organ 28 of the attachment unit 14 rotates around the connecting shaft 26 shown in FIG. Instead of the connection 17 of the attachment unit 14, the connection 16 can have the contact organ 28 and / or the cylinder 38 of FIG. 3. In FIG. 2, the attachment unit 14 may be provided with a hole 40 instead of the connection portion 16. The connection principle may be reversed.

  FIG. 4 shows another embodiment, which consists for example of a jack plug known from consumer electronics (German: Klinkenchecker). The connection part 16 of the vacuum device 10 is shown on the left side. The connecting part 16 has a sleeve element 20. The contact organ 28 is attached to the sleeve element 20 so as to protrude into the region of the sleeve element 20. The contact organ 28 is pretensioned in the contact direction by a spring 34. In other words, it is supported elastically. The contact organ 28 is electrically and / or information-technically connected to the control device 12 not shown here via a wiring 32.

  In the figure on the right side of FIG. 4, the connection 17 of the attachment unit 14 is shown together with the plug element 18 and the contact organ 28. The contact organs 28 are each arranged flat around the plug element 18. The contact organ 28 is electrically and / or informationally connected to the functional unit of the attachment unit 14 (not shown). The contact organs 28 are insulated from one another by axially spaced, non-conductive intermediate regions.

  The plug element 18 and the sleeve element 20 are each formed in a cylinder shape. Both are arranged coaxially on the connecting shaft 26. In order to achieve the connected state, the attachment unit 14 is pushed to the left, ie the flag element 18 is pushed into the sleeve element 20. In so doing, the contact organ 28 of the connection 16 is elastically returned by the plug element 18. In the end position corresponding to the connected state, the contact organ 28 of the connection 16 faces the contact organ 28 of the attachment unit 14 and is held in contact therewith by a spring 34. Thus, the electrical and / or information technology connection of the attachment unit 14 to the control device 12 (not shown) is ensured via the plurality of wires 32.

  The mechanical connection of the accessory unit 14 with the vacuum device 10 is likewise carried out cooperatively by the plug element 18 and the sleeve element 20. In this case, for example, the plug element 18 can be held in the sleeve element 20 in a frictional manner. In addition or alternatively, the plug element 18 can, for example, have an element that can be returned and engages or locks with the undercut. This element engages or locks with the undercut of the sleeve element 20 in a connected state, and thus the plug element 18 is axially secured within the sleeve element 20. For example, the plug element 18 and the sleeve element 20 are configured so that the attachment unit 14 is rotated to the locked position and thereby secured after or when the plug element 18 is inserted into the sleeve element 20. Is also possible.

  FIG. 5 shows another embodiment according to the principle of jack plug. The attachment unit 14 has a connection 17 having a plug element 18 with four contact organs 28. These contact organs are each arranged in a plane around the plug element 18 with axial spacing. Opposing contact organ 28 arranged on plug element 18 is shown contact organ 28 of connection 16 not shown. Each contact organ 28 of the connection part 16 faces the contact organ 28 of the attached unit 14 assigned thereto, and is in contact therewith.

  The mechanical and / or electrical and / or information technology connections at the connections of FIGS. 4 and 5 can also be reversed. Therefore, for example, in FIG. 5, a connection portion 16 can be provided instead of the connection portion 17 of the attachment unit 14. It would also be possible for the connection 16 to have a plug element and the accessory unit 14 to have a sleeve element. The contact organ 28 of the sleeve element 20 and / or the contact organ 28 of the plug element 18 can also be elastically supported in FIG. 4 and / or formed in a ring shape.

  FIG. 6 schematically shows another embodiment of the connection 17 according to the invention. In this embodiment, basically any attachment unit, for example a ventilator or its members, for example a ventilator grid part 36, should be fixed to the vacuum device and a fixing part is used for connection of the attachment unit. Based on the principle.

  The ventilator instep 36 can be screw-connected to the vacuum apparatus 10 of FIG. 1 via a screw connection member 42 as a constituent member of the accessory unit. In other words, connection elements not shown, for example assembly screws, are provided. The contact organ 28 is connected to the accessory unit as a constituent member of the ventilator lattice portion 36 in terms of electrical and / or information technology. In other words, the contact organ is formed on the connecting member 42 as the contact surface 28, and this is performed by contacting an electric assembly screw on these in a fixed state. A counter holder (not shown) in the connection 16 of the vacuum device 10 (FIG. 1) likewise has at least one contact organ. This contact organ is electrically connected to the contact surface 28 of the associated flange 42 via each assembly screw.

  The electrical and / or information technology connection of the accessory unit 14 to the control device 12, ie here the connection between the contact organs 28, uses (generally speaking) conductive connection elements or assembly elements. Guaranteed. The advantage of this embodiment is that structurally present mechanical connections can also be used for electrical and / or information technology connections with little effort.

  Conversely, the contact surface 28 of FIG. 6 is in direct contact with the connecting element, for example with a similarly flat contact organ (contact organ of the connection 16 of the vacuum device 10), which is assigned to it directly, ie Here, it is also conceivable that the screw connection coupling member 42 of the ventilator lattice portion 36 is screw-connected to a corresponding contact surface in the vacuum apparatus.

  In general, not only with respect to the embodiment described above, but according to the invention, the attachment of the accessory unit to the vacuum device can be carried out with or without rotational movement. The contact between the contact organ 28 of the attachment unit 14 and the contact organ 28 of the connection 16 can be effected, for example, radially or axially with respect to the connection shaft 26. The electrical and / or information technology connection of the accessory unit 14 to the control device 12 may include signal wiring and / or communication wiring (such as a data bus) for one or more supply currents, digital and / or analog signals. Can be included). The connection part 16 can also be provided later. This is done, for example, by forming a connection point behind the cable on the slip ring on the assembly side. In the connection part 16, at least one contact organ 28 can also be formed as a plug element or a sleeve element. This is functionally separate from the mechanical connection between the accessory unit 14 and the vacuum device 10. In this embodiment, for example, a sleeve element is provided at the connection 16 for an electrical and / or information technology connection, and additionally a screw screw is provided for mechanically connecting the accessory unit with the vacuum device. ing.

  The illustrated embodiment of the connection 16 of the vacuum device 10 and the connection 17 of the accessory unit 14, in particular those of FIGS. 2-5, can also be provided in reverse. Thus, for example, it is also conceivable that the sleeve element or the elastic contact organ is on the connection 16 of the vacuum device 10 or on the side of the connection 17 of the accessory unit 14.

  In addition, the number of contact organs may vary. This quantity is in accordance with the quantity of cores required for electrical and / or information technology connections.

  The electrical and / or information technology connection of the accessory unit 14 to the control device 12 can also be formed by wireless, for example a wireless connection or optical data exchange.

  The contact organ 28 and the wiring 32 in FIGS. 1 to 6 can be made conductive. However, they can also be formed by optical transmission means for information technology connections. The wiring 32 can be formed as an optical fiber, and the contact organ 28 can be formed as a connecting element of the optical fiber.

  The accessory unit can have its own power supply, for example a storage battery or a battery. It can also receive its energy from a radio signal or carrier signal or inductive energy transfer. However, the accessory unit can also receive its energy, for example from the surroundings. This may be received, for example, from a temperature difference by a Peltier element, or from vibration, solar power, or other types of radiation.

  The accessory unit includes, for example, individual or one or more valves, sensors for pressure, temperature or vibration, ventilators, external operating time counters, or external devices for detecting operating data, or memory thereof.

  The accessory unit 14 can be necessarily or optionally connected to the vacuum device 10. As long as the accessory unit 14 is not connected to the connection part 16 of the vacuum apparatus 10, the connection part 16 can remain free or sealed by a dummy plug.

  The control device 12 can be provided for the control of the accessory unit 14 and for the control of the vacuum device 10, in particular for the control of its drive.

  Contact of the contact organ 28 of the connection part 16 with the contact organ 28 of the connection part 17 takes place in a radial direction, for example in FIGS. 4 and 5, for example in an axial direction, for example in FIGS. 2 and 3, and / or tangentially. It is possible that a connecting part 16 is formed.

DESCRIPTION OF SYMBOLS 10 Vacuum apparatus 11 Housing 12 Control apparatus 13 Housing 14 Accessory unit 16 Connection part 17 Connection part 18 Plug element 20 Sleeve element 22 Inner thread part 24 Outer thread part 26 Connection shaft 28 Contact organ 30 Access opening 32 Wiring 34 Spring 36 Member 38 Cylinder 40 Hole 42 Screw connection connecting member

Claims (21)

A vacuum device (10), in particular a vacuum pump,
Having at least one connection (16) for the accessory unit (14); and
A control device (12) for the accessory unit (14);
At that time, the connection (16) is electrically and / or information to the controller (12) of the accessory unit (14) for mechanical connection with the vacuum device (10) of the accessory unit (14). Vacuum device (10) characterized in that it is also formed for technical connection. The mechanical connection is or includes a plug connection, in which case the connection (16) for the mechanical connection mechanically connects at least one sleeve element (20) or plug element (18). The vacuum device (10) according to claim 1, characterized in that it is included as a flexible connecting organ. The mechanical connection is or includes a screw connection, in which case the connection (16) for the mechanical connection includes at least one screw part (22) as a mechanical connection organ. The vacuum device (10) according to claim 1 or 2, characterized in that 4. Vacuum device (10) according to claim 3, characterized in that the screw connection comprises a separate fixation organ for the attachment unit (14), in particular a fixation screw or a fixation screw opening. 2. The mechanical connection and the electrical and / or information technology connection have one common connection shaft 26, in particular comprising an insertion shaft, a slide shaft and / or a rotation shaft. To a vacuum device (10) according to any one of claims 4 to 4. The electrical and / or information technology connection is invariant to rotation about the connection axis (26), where the connection is technically at any angular position or at a finite number of angular positions. 6. Vacuum device (10) according to claim 5, characterized in that it functions. The connection (16) for mechanical connection includes at least one mechanical connection organ, wherein at least one contact organ (28) for electrical and / or information technology connection is present. The vacuum device (10) according to any one of claims 1 to 6, wherein the vacuum device (10) is provided in or close to the connecting organ. For a virtual cylinder whose central axis overlaps with a connection axis (26) of mechanical connection and / or electrical and / or information technology connection, in particular with a plug-in axis, slide axis and / or rotation axis. 8. Vacuum device according to claim 1, characterized in that contact organs (28) for electrical and / or information technology connections are provided at the periphery or in the front. (10). With respect to the connection axis (26) of the mechanical connection and / or electrical and / or information technology connection, it is possible to be contacted in a radial or axial direction, in particular with regard to the plug-in axis, slide axis and / or rotation axis 9. Vacuum device (109) according to claim 7 or 8, characterized in that a contact organ (28) is provided. 10. Vacuum device (10) according to any one of claims 7 to 9, characterized in that the contact organ (28) is provided in the form of a protrusion or a ridge or is formed flat. 11. The vacuum device (10) according to any one of claims 7 to 10, characterized in that the contact organ (28) is formed in a ring shape. 12. Vacuum device (10) according to any one of claims 7 to 11, characterized in that the contact organ (28) is formed or provided in a flexible, in particular elastically supported manner. . A plurality of contact organs (28) are provided, which are mechanical connections and / or electrical and / or with respect to the connection axis (26), in particular with respect to the plug-in axis, slide axis and / or rotation axis. Or directed to an information technology connection, in which the contact organ (28) is provided in particular distributed along and / or around the connection axis (26) A vacuum device (10) according to any one of the preceding claims, characterized in that. A contact organ (28) is provided around the connecting shaft (26), preferably in the form of a coaxial ring with an axially oriented contact surface, or preferably a radially oriented contact surface 14. Vacuum device (10) according to claim 13, characterized in that it is provided around the connecting shaft (26) in the form of a ring spaced along the connecting shaft (26). Electrical and / or information technology connections are formed in multi-channel and / or multi-functional fashion, in particular with one contact organ (28) for each channel or for each function. 15. A vacuum device (10) according to any one of the preceding claims, characterized in that it is provided. 16. Vacuum device (10) according to any one of the preceding claims, characterized in that one or only function of the connection is an electrical power supply for the accessory unit (14). The connecting part (16) has an interface part for at least one functional unit of the accessory unit (14), in particular a valve unit or a sensor unit, preferably the interface part is a housing for the functional unit. 17. A vacuum device (10) according to any one of the preceding claims, characterized in that it is formed as a part, a penetrating part or an access opening (30). The control device (12) is integrated in the housing of the vacuum device (10) or is provided outside the housing of the vacuum device, in which case the control device (12) has its own housing. 18. A vacuum device (10) according to any one of the preceding claims, characterized in that One or more wires (32) travel at least partly and in particular at least essentially inside the housing of the vacuum device (10) for connection of the connection (16) to the control device (12). 19. A vacuum device (10) according to any one of the preceding claims, characterized in that The connection (16) detects the presence of the accessory unit (14), in particular its mechanical connection with the vacuum device (10), and only when one of the accessory units is present, it takes one action, in particular a switching process. 20. A vacuum device (10) according to any one of the preceding claims, characterized in that it is configured to perform or release. A system comprising at least one vacuum device (10) having a connection (16), at least one attachment unit (14) having a connection (17), and a control device (12) for the attachment unit (14); The connection parts (16, 17) are both mechanically connected to the vacuum device (10) of the accessory unit (14), electrical and / or information to the control unit (12) of the accessory unit (14). A system characterized by a technical connection.

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