DE102020125480A1 - Clamping system for clamping a workpiece - Google Patents

Abstract

The invention relates to a clamping system (10) for clamping a workpiece (16) of any shape, in particular for milling or turning. The clamping system (10) comprises: - at least one recording device (36) for recording data of the workpiece (16), in particular data relating to the workpiece positions, workpiece positions and deformation states of the workpiece (16), - comprising at least one, in particular several, clamping surfaces (28). Clamping device (14), wherein the clamping device (14) comprises at least one actuator device (18) which can slide the clamping surface (28) along an actuator guide in a displacement direction (B) relative to a base device (12) of the clamping device (14) and attaches it to the contour (A) of the workpiece (16) to be clamped in such a way that it can be approached and placed, - at least one control device (24) which can control the actuator device (18) of the clamping device (14) so that it can be moved and locked into any desired position, and - at least a data processing device (30) for controlling a position of the actuator device (18) on the basis of the data from the detection device (36), wherein the Data processing device is wired or wirelessly connected to the control device (24).

Description

The present invention relates to a clamping system for clamping a workpiece of any shape, in particular for clamping a workpiece for milling or turning.

STATE OF THE ART

Various clamping devices are known from the prior art. In the production of high-quality facade elements, very large or long workpieces such as metal profiles weighing several tons have to be processed in small quantities. This necessitates a high set-up effort when positioning and clamping the workpieces with specially developed and manufactured clamping tools, which makes warehouse logistics more difficult and increases labor and material costs. Furthermore, it is practically impossible to clamp an irregular and sometimes mechanically sensitive workpiece with rigidly designed and solid clamping jaws with unchangeable clamping sides.

For example, the DE 42 39 180 A1 a clamping device with a mold clamping jaw. The clamping device has a multiplicity of elongate clamping rams which can be displaced longitudinally and can be applied against any desired contour of a workpiece as the clamping side.

This makes it possible, among other things, to connect the clamping tappets to chambers of a system that is filled with hydraulic fluid and communicates with one another. Built-in valves allow a fluid line in the system to be shut off for each clamping ram. This makes it possible to lock the clamping rams in any set position. Other similar clamping jaws with clamping sides that can be changed in any shape are, for example, in EP 899 061 A2 and the DE 196 31 847 A1 described.

Furthermore, in the DE 7114487 U a magnetic clamping device is known. The clamping device perceives clamping by means of ferromagnetic particles placed in a container. A largely freely formed workpiece can be placed in this container and the magnetic particles can be firmly embedded in this workpiece by applying a magnetic field.

Based on the prior art mentioned above, the problem arises that a large number of valves or actuators are installed, or that predefined actuator movements are provided for the clamping actuators with clamping plungers that are permanently installed in the clamping jaws. This leads to high production costs for the clamping jaws and complex maintenance, since a large number of valves and actuators are installed.

In addition, the use of a large number of clamping rams or actuators in a prefabricated holder is disadvantageous, since the holder has to be adapted to the respective machine or to the work process to be carried out. This causes high manufacturing costs and prevents the available individual clamping devices from being widely used.

It is therefore the object of the present invention to propose a modular clamping system, with which the disadvantages of the prior art are avoided, in order to simplify a manufacturing process and maintenance, to enable a high level of flexibility and to easily retrofit an existing machine.

This object is achieved by a clamping system for clamping a workpiece with the features of claim 1. Advantageous developments of the invention are the subject matter of the dependent claims.

DISCLOSURE OF THE INVENTION

• - zumindest eine Erfassungsvorrichtung zum Erfassen von Daten des Werkstücks, insbesondere Daten bezüglich der Werkstückpositionen, Werkstücklagen und Verformungszustände des Werkstücks,
• - zumindest eine, insbesondere mehrere Spannflächen umfassende Spannvorrichtung, wobei die Spannvorrichtung zumindest eine Aktoreinrichtung umfasst, die entlang einer Aktorführung in einer Verschieberichtung relativ zu einer Grundeinrichtung der Spannvorrichtung die Spannfläche bzw. die Spannflächen verschiebbar und an die Kontur des zu spannenden Werkstücks heranfahrbar und anlegbar bewegen kann,
• - zumindest eine Steuervorrichtung, die die Aktoreinrichtung der Spannvorrichtung in einer gewünschte beliebige Position fahrbar und arretierbar steuern kann, und
• - zumindest eine Datenverarbeitungsvorrichtung zur Steuerung einer Position der Aktoreinrichtung auf Basis der Daten der Erfassungsvorrichtung, wobei die Datenverarbeitungsvorrichtung drahtgebunden oder drahtlos mit der Steuervorrichtung verbunden ist.

According to the invention, a modular clamping system for clamping a workpiece of any shape, in particular for milling or turning, is proposed. The clamping system includes:

• - at least one acquisition device for acquiring data of the workpiece, in particular data relating to the workpiece positions, workpiece positions and deformation states of the workpiece,
• - At least one clamping device comprising, in particular, a plurality of clamping surfaces, the clamping device comprising at least one actuator device which moves the clamping surface or clamping surfaces along an actuator guide in a displacement direction relative to a basic device of the clamping device so that it can be moved and placed against the contour of the workpiece to be clamped can,
• - At least one control device that can control the actuator device of the clamping device in a desired position such that it can be moved and locked, and
• - At least one data processing device for controlling a position of the actuator device on the basis of the data of the detection process direction, wherein the data processing device is wired or wirelessly connected to the control device.

This enables an "intelligent" clamping system to reduce the set-up effort and to make warehouse logistics more flexible, which can be used in a modular manner. The clamping system can be used to clamp a workpiece of any shape. In other words, the clamping system is designed to be as independent as possible of the geometry of a workpiece that is usually to be machined by milling and turning. The clamping system can be used to advantage when processing metal or wood, e.g. when producing high-quality facade elements or turbine blades. The clamping system is so flexible that existing old systems can also be upgraded with it.

Furthermore, each user can attach the actuator devices of the clamping system either manually via bores in metal plates or housings or automatically via magnetic contact between the actuator devices and a clamping carriage. A user can attach the actuator devices to almost freely selectable positions and, controlled manually or automatically, assemble a modular clamping system that is adapted to the respective machining situation. The magnetic mounting of the clamping devices also makes it possible to first attach the clamping device to the workpiece to be clamped, to move it into a processing machine, and then to extend the actuator devices under central control in order to anchor them in the clamping carriage of the processing machine.

The clamping device comprises at least one basic device and at least one, in particular several, actuator devices designed as clamping surfaces, which can move so that they can be placed against the contour of the workpiece to be clamped. This allows the clamping surfaces to be shifted relative to the basic equipment and the workpiece to be held in a fixed position. The actuator devices can be moved along the actuator guide and can be fixed by a locking device.

The actuator devices are elongate, which preferably move along a vertical axis of a guide pin, a cylinder, a screw, an elongated thread or along a sleeve, which may have a thread.

The clamping system acts on the workpiece at several positions by means of the actuator devices. Each actuator device includes a movable unit that can be moved in and out either independently or under external control. The actuator devices can be formed from one or more electrically actuated stamps mounted close together or individually. The workpiece can then be machined or milled using a machining tool. The actuator device can be moved in and out at a variable speed depending on the clamping length and the clamping force.

Furthermore, the control device can control the actuator devices as a function of the data recorded by the detection device in conjunction with the CAD data stored in the clamping system. It is advantageous that the actuator devices remain active during processing, i.e. are not mechanically locked in a conventional manner. It is also possible for at least one pair of actuator devices to be released during processing in order to assume a new position. This enables machining at the points that were previously covered by the clamping device, and at the same time the workpiece is held securely at all times. Furthermore, the actuator devices can be fastened either in the prefabricated clamping carriage or individually in subsequent bores.

The data processing device controls the actuator devices centrally or decentrally. A combination of the control signals is advantageously possible, so that the actuator devices can exchange data with one another and/or with the central data processing device, with the data processing device being able to control positions of each individual actuator device by wire, for example via an electrical connection, or wirelessly.

In an advantageous development of the clamping system, the actuator device can comprise at least one base unit and at least one attachment unit that can be attached to the base unit in an exchangeable manner and can be screwed onto the base unit, with an end section of the attachment unit preferably having the shape of a cuboid, a cylinder, a shape of a trigonal prism or a hexagonal prism. and includes the clamping surface. The end section of the attachment unit can be provided with different geometries. The end section can have a round, crowned, pointed or planar geometry. On a surface of the actuator device. sensors of various types, such as force sensors or contact sensors, can be located, in particular at one end section. Furthermore, an attachable cap made of different materials to protect the sensors and the movement be put on piece by piece. Furthermore, the actuator device, preferably the end area, in particular an attachable cap, can be coated with a material that allows detection that can be carried out by the control device, in particular optical detection, wherein the material can reflect specific wavelengths of an electromagnetic spectrum.

In a further advantageous development, the detection device can include at least one sensor for detecting the data of the workpiece. The data may include workpiece position data, workpiece location data, and deformation state data, as desired. An electrical sensor can be provided as a sensor of the detection device for detecting voltages and currents. Furthermore, a chemical sensor can be arranged, which can react selectively to a compound or classes of compounds, which also includes "electronic noses".

In a further advantageous development, the sensor can be embodied as a pressure sensor, force measuring sensor, yaw rate sensor, acceleration sensor, gas and moisture measuring sensor, temperature sensor and/or contact sensor. The gas measurement sensor can be arranged to acquire data of, for example, oxygen and hydrogen.

In a further advantageous development, the detection device can be integrated in the actuator device, in particular in the attachment unit. The sensors that are contained in the detection device can advantageously be arranged in a space-saving manner in the attachment unit. The attachment unit is advantageously exchangeable. The screw-on attachment unit is used either as a pure extension or to include additional functions such as sensors, power supply devices, electronics, communication electronics or identification features such as RFID chips or color coding. Functionality or operational capability can be added or removed quickly and easily by simply changing the screw-on attachment unit.

In a further advantageous development, the detection device can include at least one camera. This means that an optical check and image evaluation can be carried out, and every work step can also be logged in accordance with Industry 4.0.

In a further advantageous development, the detection device can include at least one transmission device for actively and/or passively transmitting the data of the workpiece to the data processing device, with the transmission device being designed as a wired or wireless transmission device, in particular a radio, WLAN or RFID transmission device. The actuator device with a wireless connection option can include at least one unit for receiving, and optionally a further additional unit for sending control signals for controlling an electric motor and for transmitting the data from the sensors. The control signals can be transmitted via interfaces such as Bluetooth, WLAN, radio signals or NFC technology. The actuator device can optionally also be equipped with the sensors and the electronics, with the sensors preferably being able to record parameters for the workpiece processing and for the voltages.

In a further advantageous development, the actuator device can be designed as a clamping ram, with at least one detection device preferably being included in the clamping ram. The clamping ram can preferably consist of a metal, in particular steel, a steel alloy, aluminum or an aluminum alloy. Alternatively, the clamping ram can be made of different materials, preferably a combination of a plastic and a metal.

Furthermore, the clamping ram can be round or square. The clamping ram preferably has a cuboid shape, a cylindrical shape, a shape of a trigonal prism or a hexagonal prism. Mixed shapes and smooth transitions of different cross-sectional shapes are also possible. It is conceivable, for example, that the sensors, the energy suppliers, the color markings or the RFID units can be attached to or in the clamping ram.

In a further advantageous development, the clamping surface of the actuator device can have a diameter of a few millimeters up to one meter. Basically there is no size limit. However, with sizes of less than 8 mm in diameter, attachment of an energy, reception, transmission, drive and sensor unit is expensive. The actuator device can be constructed with a diameter of up to 3 mm. As a rule, the actuator device is designed with a diameter of 8 mm to 2 cm.

In a further advantageous development, the clamping surfaces of the at least one, in particular several actuator devices can be arranged close to one another, in particular the distances between the clamping surfaces can be smaller than the diameter of the clamping surfaces. With this, it is possible to precisely clamp the workpiece of any shape.

In a further advantageous development, the clamping device can be used outside of clamping tools, in particular as a holding device, for load securing. It is conceivable to use the modular clamping system in transport vehicles, freight trains, trucks or the like for transport security.

In a further advantageous development, the clamping device can be fastened to a prefabricated clamping carriage, to a clamping jaw and/or directly to a workpiece to be clamped and to a further support point by means of magnetic force or adhesive force. It can thus be advantageously achieved that no drilling is required in the clamping slide for the actuator guide. The magnetic force can be applied permanently magnetically or by means of electromagnets. A current of the electromagnets can be adjusted adaptively depending on an applied clamping force.

Tensioning can advantageously be effected by a lifting movement of a tensioning carriage and an additional movement of one or the plurality of actuator devices.

In a further advantageous development, at least one force control unit can be included in the actuator device, so that a predefined holding force of the actuator device can be defined and adapted to a force occurring as a result of the machining of the workpiece. The opposing clamping devices can be controlled during processing in such a way as to adapt the holding forces of the actuator devices to the forces occurring during processing, so that deformation, in particular bending of the workpiece can be prevented.

In a further advantageous development, at least one electric motor, in particular an electric motor and/or at least one energy source for driving the electric motor and/or at least one signal receiver can be included for each actuator device. The signal receiver can either be integrated in the actuator device or supply one or more actuator devices with current on site. If the latter is the case, there is again an energy transmission connection from the signal receiver to the respective actuator device. This can be done, for example, via a cable, an electrically conductive path, or via an induction interface.

In a further advantageous development, the energy source can be connected to the electric motor by wire or wirelessly, preferably via radio technology. For this purpose, a transmitter or transmitter can emit the energy in the form of radio waves with a frequency, for example, between 5.850 and 5.875 GHz in the giga-heart band (GHz). The signal receiver can convert the energy into electrical energy. For example, with a device from Energous Corporation, the energy can be transmitted up to 10 W in relation to the signal receiver. The transmission technology can achieve a range of up to 100 m, preferably 50 m, in particular 2 to 10 m from the transmitter to the signal receiver.

In a further advantageous development, at least one primary or secondary electrochemical battery and/or at least one fuel cell and/or at least one capacitor and/or at least one induction coil and/or at least one cable connection can be included in the energy source. The energy can be used to drive the electric motor and power the electronics and sensors. Examples of primary and secondary energy cells are batteries, lithium batteries, zinc-air batteries, fuel cells, in particular fuel cells that use methanol, ethanol, formaldehyde, formic acid, paraformaldehyde or oxymethylene derivatives, so-called OME such as dimethoxymethane or polyoxymethylene derivatives such as the plastic POM. In the case of using the fuel cells, combinations of the energy suppliers can be used. For example, a direct methanol fuel cell delivers a small current and uses it to charge a secondary energy storage device such as a lithium battery or a capacitor.

Furthermore, the energy suppliers for the actuating drive of the actuator device and for the sensors and the controller can be different from one another. For this purpose, the sensor system and the data transmission device can be supplied with energy via the radio technology described above, while the actuating drive and the locking can take place via the energy suppliers described above. Based on this, there is the advantage of a large reduction in redundancy, in particular there is the possibility of using sensors close to an end section of the actuator device.

In a further advantageous development, the signal receiver can either be integrated in each actuator device or arranged separately from the actuator device.

In a further advantageous development, a lifting movement of the actuator device can take place mechanically/hydraulically and/or pneumatically and/or electrically. For example, a pressure intensifier or an electric drive with a ball roller spindle can also be used. To overcome long strokes, it makes sense to mount the workpiece on a linear or flat bed slide. The linear slide can consist of a movable housing and two screwed-on traverses.

character list

• 1 in einer perspektivischen Darstellung eine Ausführungsform von Anordnungen von mehreren Spannvorrichtungen eines Spannsystems gemäß einer Ausführungsform, die ein Werkstück einspannen;
• 2 in einer perspektivischen Darstellung eine in 1 dargestellte Spannvorrichtung in Vergrößerung;
• 3 in einer perspektivischen Darstellung zwei sich entgegenwirkenden Spannvorrichtungen des Spannsystems der 1;
• 4 in einer perspektivischen Darstellung zwei in 1 dargestellte Spannvorrichtung mit einem eingespannten Werkstück;
• 5 Seitenansicht der in 4 dargestellten entgegenwirkenden Spannvorrichtungen mit dem Werkstück;
• 6 Schematische Draufsicht eines Spannsystems gemäß einer weiteren Ausführungsform;
• 7 in einer perspektivischen Darstellung Spannstößel eines Spannsystems gemäß einer weiteren Ausführungsform;
• 8 Seitenansicht einer Aktoreinrichtung eines Spannsystems gemäß einer weiteren Ausführungsform; und
• 9a - 9d Vorderansicht der in 8 dargestellte Aufsatzeinheiten mit verschiedenen Spitzenformen.

Further advantages result from the figures and the associated description of the drawings. Exemplary embodiments of the invention are shown in the figures. The figures, the description and the claims contain numerous features in combinations. The person skilled in the art will expediently also consider these features individually and combine them into further meaningful combinations. Show it:

• 1 in a perspective view an embodiment of arrangements of several clamping devices of a clamping system according to an embodiment, which clamp a workpiece;
• 2 in a perspective view an in 1 shown clamping device in enlargement;
• 3 in a perspective view of two opposing clamping devices of the clamping system 1 ;
• 4 in a perspective view two in 1 shown clamping device with a clamped workpiece;
• 5 Side view of the in 4 illustrated counteracting fixtures with the workpiece;
• 6 Schematic plan view of a clamping system according to a further embodiment;
• 7 in a perspective representation of a clamping ram of a clamping system according to a further embodiment;
• 8th Side view of an actuator device of a clamping system according to a further embodiment; and
• 9a - 9d Front view of the in 8th Attachment units shown with different tip shapes.

In the figures, the same or similar components are denoted by the same reference symbols.

1 represents a clamping system 10, which comprises four modular clamping devices 14. Each clamping device 14 consists of a basic device 12 and several, in this case eight, actuator devices 18 and is connected to an energy source, not shown, via an energy supply 76 by means of a cable connection 74. A workpiece 16 can be clamped by means of the clamping devices 14, with two clamping devices 14 being arranged on two opposite sides of the workpiece 16 in a counteracting manner.

According to 2 For example, the clamping device 14 can be attached to a clamping carriage 60 by means of magnetic force or adhesive force. As a result, the clamping device 14 can be arranged in a modular manner very easily on ferromagnetic clamping slides or other bearing surfaces.

The actuator devices 18 of each clamping device 14 can 3 optionally extend to a predetermined clamping force, with the counterforce being variable and dependent on a machining operation and the workpiece 16 . Once a position has been set with an inward and outward movement routine and a clamping force, it can be taken over by a central controller for a next workpiece 16 for series production. Each actuator device 18 includes an end section 44 which has a cylindrical shape.

In 4 and 5 two counteracting actuator devices 18 are displaceable along an actuator guide (not shown) in a displacement direction B relative to the basic devices 12 of the clamping devices 14 and can be moved and placed on the contour A of the workpiece 16 . The workpiece 16 fastened on the clamping carriage 60 is clamped in a clamping position between the plurality of actuator devices 18 of the clamping devices 14 acting in opposite directions in pairs.

a in 6 The clamping system 10 shown schematically comprises eight clamping devices 14 which are mounted on a support device 52 and are directed in pairs in opposite directions and which each have clamping surfaces 28 at the axial ends of the actuator devices 18 . The clamping devices 14 of the clamping system 10 are used within a clamping tool 40 to a workpiece 16 z. B. for an exciting editing. The actuator devices 18 of the clamping devices 14 can be displaced in a displacement direction B relative to the basic devices 12 so that the clamping surfaces 28 can be placed against the contour A of a workpiece 16 . In the clamping system 10, a control device 24 is also provided, which can move and lock the actuator device 18 in any desired position. In addition, a camera 50 is arranged as a recording device 36 in the clamping system 10 for recording data of the workpiece 16, in particular data relating to the workpiece position, workpiece position and deformation state of the workpiece 16.

An actuator device 18 can have a clamping ram 22 in accordance with 7 include where the insteps Plunger 22 may have a cuboid shape, a cylindrical shape, a trigonal prism shape or a hexagonal prism shape. Mixed forms are also possible.

In 8th a multi-part actuator device 18 is shown. The actuator device 18 consists of a base unit 46 and an attachment unit 48 that can be attached to the base unit 46 in an exchangeable manner and can be screwed onto the base unit 46. The base unit 46 and/or the attachment unit 48 can have a cross-sectional shape that corresponds to the shape of the clamping ram 22 of the 7 is equivalent to.

According to 9a until 9d is the attachment unit 18 of 8th shown with an end portion 44 which may have various longitudinal shapes. The end portion 44 may have a parallelepiped shape, a cylinder shape, a trigonal prism shape, or a hexagonal prism shape.

Reference List

10

clamping system

12

basic setup

14

clamping device

16

workpiece

18

actuator device

22

clamping plunger

24

control device

28

clamping surface

36

detection device

40

clamping tool

44

end section

46

base unit

48

attachment unit

50

camera

52

support device

60

clamping slide

74

cable connection

76

energy supply

A

contour

B

shift direction

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 4239180 A1 [0003]
• EP 899061 A2 [0004]
• DE 19631847 A1 [0004]
• DE 7114487 U [0005]

Claims (18)

Clamping system (10) for clamping a workpiece (16) of any shape, in particular for milling or turning, comprising: - at least one detection device (36) for detecting data of the workpiece (16), in particular data relating to the workpiece positions, workpiece positions and deformation states of the workpiece (16), - At least one clamping device (14), in particular a plurality of clamping surfaces (28), wherein the clamping device (14) comprises at least one actuator device (18) which is along an actuator guide in a displacement direction (B) relative to a base device (12) of the clamping device ( 14) the clamping surface (28) can be moved and moved to the contour (A) of the workpiece (16) to be clamped and placed thereon, - at least one control device (24) which can move and lock the actuator device (18) of the clamping device (14) into any desired position, and - At least one data processing device for controlling a position of the actuator device (18) on the basis of the data from the detection device (36), the data processing device being wired or wirelessly connected to the control device (24). Clamping system (10) according to one of the preceding claims, characterized in that the actuator device (18) comprises at least one base unit (46) and at least one attachment unit (48) which can be attached to the base unit in an exchangeable manner and screwed onto the base unit (46), with preferably a The end (44) of the attachment unit (48) has a parallelepipedal shape, a cylindrical shape, a shape of a trigonal prism or a hexagonal prism, and the clamping surface (28) comprises. Clamping system (10) according to claim 1 , characterized in that the detection device (36) comprises at least one sensor for detecting the data of the workpiece (16). Clamping system (10) according to claim 3 , characterized in that the sensor is designed as a pressure sensor, force sensor, yaw rate sensor, acceleration sensor, gas and moisture sensor, temperature sensor and/or contact sensor. Clamping system (10) according to one of Claims 1 until 3 , characterized in that the detection device (36) in the actuator device (18), in particular in the attachment unit (48) is integrated. Clamping system according to one of the preceding claims, characterized in that the detection device (36) comprises at least one camera. Clamping system (10) according to one of the preceding claims, characterized in that the detection device (36) comprises at least one transmission device for actively and/or passively transmitting the data of the workpiece (16) to the data processing device, the transmission device being a wired or wireless transmission device, in particular radio, WLAN or RFID transmission device is formed. Clamping system (10) according to one of the preceding claims, characterized in that the actuator device (18) is designed as a clamping ram (22), at least one detection device (36) preferably being included in the clamping ram (22). Clamping system (10) according to one of the preceding claims, characterized in that the clamping surface (28) of the actuator device (18) has a diameter of a few millimeters up to one meter. Clamping system (10) according to one of the preceding claims, characterized in that the clamping surfaces (28) of the at least one, in particular several actuator devices (18) are arranged close to one another, in particular the distances between the clamping surfaces (28) are smaller than the diameter of the clamping surfaces (28 ) are. Clamping system (10) according to one of the preceding claims, characterized in that the clamping device (14) can be used outside of clamping tools (40), in particular as a holding device, for securing loads. Clamping system (10) according to one of the preceding claims, characterized in that the clamping device (14) can be fastened to a prefabricated clamping carriage (60), to a clamping jaw and/or directly to a workpiece (16) to be clamped by means of magnetic force or adhesive force. Clamping system (10) according to one of the preceding claims, characterized in that at least one force control unit is included in the actuator device (18), so that a predefinable holding force of the actuator device (18) can be fixed and linked to a force occurring as a result of the machining of the workpiece (16). is customizable. Clamping system (10) according to one of the preceding claims, characterized in that for each actuator device (18) there is at least one electric motor, in particular an electric motor and/or at least one energy source for driving the electric motor (62) and/or at least one signal receiver . Clamping system (10) according to Claim 14 , characterized in that the energy source is preferably wired or wirelessly connected to the electric motor via radio technology. Clamping system (10) according to Claim 14 or 15 , characterized in that at least one primary or secondary electrochemical battery and/or at least one fuel cell and/or at least one capacitor and/or at least one induction coil and/or at least one cable connection (74) is included in the energy source. Clamping system (10) according to Claim 14 , characterized in that the signal receiver is either integrated in each actuator device (18) or arranged separately from the actuator device (18). Clamping system (10) according to one of the preceding claims, characterized in that a lifting movement of the actuator device (18) can take place hydraulically and/or pneumatically and/or electrically.

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