Tensioning device, winding device and installation

Abstract

A clamping device (42, 44) for clamping a winding sleeve (30) has a base (46), a clamping head (48), and a locking mechanism (50). The locking mechanism (50) is adjustable between a locking position and a release position, wherein the clamping head (48) is axially movable relative to the base (46) between an extended position and a retracted position. In the locking position, the locking mechanism (50) axially locks the clamping head (48) in the extended position and forms a fixed stop for the clamping head (48). Furthermore, a winding device (24) and a system (10) for producing a material web (B) are provided.

Description

[0001] The invention relates to a clamping device for clamping a winding sleeve, a winding device for winding or unwinding a flat web of material, and a system for producing a web of material.

[0002] In the production of material webs, such as plastic films, the manufactured material web, for example the film, is wound onto a winding core to form a coil. The length of the winding core must correspond to the width of the material web in order to wind the material web in one continuous piece.

[0003] Advances in equipment for manufacturing material webs mean that increasingly wider material webs can be produced, which also means that the winding sleeves required for this are becoming longer.

[0004] However, longer winding sleeves also significantly increase the overall weight of a winding sleeve with a fully wound bale, thus increasing the demands on winding devices.

[0005] Winding devices typically have at least one receptacle with two clamping heads that engage the end faces of the winding sleeves and clamp them. Usually, one of the clamping heads is fixed in the axial direction, while the other is movable. The fixed, and therefore compact, clamping head is located on the operator side of the winding device to minimize obstruction to the operator.

[0006] Because of the fixed clamping head, inserting or removing a winding sleeve from the winding device requires axial movement of the sleeve to engage it with the clamping head. However, this axial movement, especially with heavy winding sleeves, exerts axial forces on the winding device and / or frame, necessitating a stiffened and larger frame. This, in turn, hinders the operator's movement when using the winding device.

[0007] It is therefore an object of the invention to provide a clamping device, a winding device and a system for producing a material web, which are designed to be compact on the operator side in the case of particularly long winding sleeves.

[0008] The task is solved by a clamping device for clamping a winding sleeve. The clamping device has a base, a clamping head, and a locking mechanism. The locking mechanism is adjustable between a locking position and a release position, and the clamping head is axially movable relative to the base between an extended position and a retracted position. In the locking position, the mechanism axially secures the clamping head in the extended position, forming a fixed stop for the clamping head.

[0009] The axially movable clamping head allows a winding sleeve to be inserted into or removed from the winding device without having to move the winding sleeve axially, as the clamping heads can simply be removed from or inserted into the winding sleeve on both sides. This reduces axial forces on the frame of the winding device, since the winding sleeve no longer needs to be moved axially.

[0010] The locking mechanism, which forms a fixed stop for the clamping head, allows the clamping device to be designed to be particularly compact, as no aids such as large spring packs are necessary to hold the clamping head in its extended position.

[0011] For example, a fixed stop is understood to mean a locking mechanism without the permanent active application of a force, as would be the case, for example, with a spring or a permanently activated actuator.

[0012] The locking mechanism is arranged axially, for example, between the base and the clamping head, in particular the engagement section.

[0013] The base can be a bearing, for example a ball bearing.

[0014] In one embodiment, the locking mechanism is designed such that it locks the clamping head in the extended position up to a maximum clamping force of at least 25 kN up to 30 kN, and / or in the locking position it blocks axial movement of the clamping head from the extended position to the retracted position by means of a positive locking mechanism, thereby providing a reliable locking or a reliable fixed stop.

[0015] In one aspect, the locking mechanism is designed such that its axial length is longer in the locked position than in the released position, specifically where the difference in length between the locked and released positions corresponds to the axial movement of the clamping head between the extended and retracted positions. This change in length in the axial direction also allows the locking mechanism to be designed extremely compactly.

[0016] For a simple and compact locking mechanism, the locking mechanism can have a first locking element and a second locking element, wherein the first locking element and the second locking element are positively connected to each other in the axial direction in the locking position of the locking mechanism, in particular wherein the first locking element is supported on the second locking element in the axial direction in the locking position.

[0017] For example, in the release position, the first locking element rests against the base in the axial direction or is supported axially by the base.

[0018] In one embodiment, the first locking element is a splined shaft and the second locking element is a splined hub, or vice versa, which engage with each other in the locking position, particularly wherein the splined shaft and the splined hub are aligned coaxially to each other and / or coaxially to the clamping head. The use of a shaft-hub connection results in an extremely robust connection and thus secure locking.

[0019] The splined hub is designed to be complementary to the splined shaft.

[0020] For example, the drive lugs of the splined shaft or projections of the splined hub are flattened in the axial direction towards the other locking element (in the locking position).

[0021] In one embodiment, the first locking element is fixed to the chuck head in the axial direction and / or rotationally fixed to the chuck head, and / or the second locking element is supported in the axial direction at the base, which allows the chuck head to be locked particularly securely.

[0022] To simplify operation of the clamping head, the clamping device can have a cylinder to which the clamping head is fixed, the cylinder extending through the locking mechanism, in particular through the first locking element and the second locking element.

[0023] The cylinder is in particular coaxial to the first and second locking elements and / or extends through the base.

[0024] In one embodiment, the clamping device has a first actuator for actuating the locking mechanism, wherein the locking mechanism is adjustable between the locking position and the release position by the first actuator, in particular wherein the first actuator is connected to the first locking element or the second locking element in such a way that it can apply a torque to the corresponding locking element. The locking mechanism can be automatically locked by the actuator.

[0025] For automatic actuation of the clamping head, the clamping device can have a second actuator which is connected to the clamping head, in particular by means of the cylinder, in such a way that it can apply a force to the clamping head in an axial direction, in particular a force of more than 20 kN and / or up to 25 kN.

[0026] For example, the second actuator can move the clamping head between the extended position and the retracted position.

[0027] The second actuator can be a hydraulic or electric cylinder.

[0028] In one embodiment, the clamping head has a conical engagement section. The conical engagement section causes the winding sleeve to center itself on the clamping head.

[0029] The problem is further solved by a winding device for winding and unwinding a flat web of material, in particular a film. The winding device has a frame that includes at least one receptacle for a winding core. The at least one receptacle has a first clamping device and a second clamping device, wherein at least the first clamping device is a clamping device as described above.

[0030] The features and advantages described for the clamping device apply equally to the winding device and vice versa.

[0031] The first and second clamping devices, in particular the respective clamping heads, are in particular coaxial to each other.

[0032] For example, the winding device has at least one winding sleeve which is rotatably held in the receptacle by the clamping devices.

[0033] The winding sleeve, for example, has a length of at least 10 m, in particular at least 12 m, and further, in particular at least 14 m, and / or a weight of over 20,000 kg, in particular over 25,000 kg. Therefore, particularly large or heavy winding sleeves can also be used. For example, a winding bale, i.e., a winding sleeve with a web of material wound onto it, has a weight of over 30 t up to 34 t or more.

[0034] In one embodiment, the second clamping device is a clamping device with an axially adjustable clamping head, in particular a clamping device as described above.

[0035] For example, the frame has two opposing rotatable wheels, wherein at least the clamping head and locking mechanism of the first clamping device is attached to a first of the wheels and at least the clamping head of the second clamping device is attached to a second of the wheels.

[0036] If the second clamping device is designed as described above, the locking mechanism can also be located on the second wheel.

[0037] To provide a winding device that can continuously receive or discharge a web of material, the frame has at least two of the receptacles, in particular wherein at least the clamping heads and the locking mechanisms of the first clamping devices of the receptacles are attached to the first wheel and at least the clamping heads of the second clamping devices of the receptacles are attached to the second wheel.

[0038] In one embodiment, the first clamping device is arranged on an operator side of the winding device, thereby ensuring even simpler operation.

[0039] The base can be fixed immovably to the frame, especially to the respective wheel, and / or be part of the frame, especially of the respective wheel, which makes the winding device particularly stable.

[0040] Furthermore, the problem is solved by a plant for the production of a material web, in particular a film production plant, with a winding device as described above.

[0041] The features and advantages described for the clamping device and / or the winding device apply equally to the system and vice versa.

[0042] Further features and advantages of the invention will become apparent from the following description and from the accompanying drawings, to which reference is made. The drawings show: Fig. 1 a schematic view of a system according to an embodiment of the invention with a winding device according to an embodiment of the invention with a clamping device according to an embodiment of the invention, Fig. 2 a schematic view of the winding device of the system according to Figure 1with a clamping device according to an embodiment of the invention, Fig. 3, 4 a sectional view through the clamping device according to Figure 2 with the clamping head in extended or retracted position, Fig. 5, 6 a sectional view through the clamping device according to Figure 2 with the locking mechanism in the locking position or release position, Fig. 7 an isolated exploded view of the locking mechanism of the clamping device according to Figure 2 , and Fig. 8 a non-inventive clamping device of the winding device according to Figure 2 .

[0043] In Figure 1 The diagram shows, in a highly schematic manner, a system 10 for the production of a material web B, which includes several different systems and devices.

[0044] In the example shown, plant 10 is a film manufacturing plant, which is used to illustrate the invention by way of example - without limiting the scope of protection.

[0045] In this case, material web B is a plastic film. It is also conceivable that material web B is a paper web, a textile web, or a web made of another knitted fabric or material that can be stretched.

[0046] In the example shown, the system 10 includes an extrusion system 12, a casting roller system 14, at least one stretching system - such as a longitudinal stretching system 16 (MDO, "Machine Direction Orienter") or a transverse stretching system 18 (TDO, "Transverse Direction Orienter") - a drawing roller system and / or edge treatment device 22 and a winding device 24.

[0047] The manufactured film is, for example, a biaxially stretched film, such as polypropylene film (BO-PP), polyethylene terephthalate film (BO-PET), polyamide film (BOPA), polyethylene film (BO-PE), polylactic acid film (BO-PLA), capacitor film (BOPP-C) or battery separator film (BSF).

[0048] To produce the plastic film, a film is created on the cooling roll of a casting roll machine 14 using the extrusion system 12. For this purpose, the extrusion system 12 produces a melt from raw materials, such as granules, which is applied to the cooling roll, thereby creating the film.

[0049] This film is conveyed as material web B from the casting roller system 14 to the longitudinal stretching system 16. In the longitudinal stretching system 16, the film is stretched lengthwise to obtain a sheet.

[0050] In the longitudinal stretching system 16, the film runs over a large number of rollers that are heated to bring the film to the desired temperature in order to stretch it.

[0051] The stretching takes place in the longitudinal direction, i.e. in the pull-off direction, between at least two of the rollers present in the longitudinal stretching system 16, so that the film becomes a foil.

[0052] The received foil is conveyed from the longitudinal stretching machine 16 to the transverse stretching machine 18 and stretched in the transverse stretching machine 18 in the transverse direction.

[0053] The transverse stretching system 18 has an oven 20 with different (treatment) zones for treating the film along the discharge direction of the system 10.

[0054] In the first zone, also called the preheating zone, the film is heated. In the subsequent second zone ("stretching zone"), the film is stretched transversely, so that at the end of the second zone it has a greater width and less thickness than at the beginning.

[0055] After stretching, the film then passes through the third and further zones (called the "heat treatment zone", "further heating zone" and / or "annealing zone"), where, for example, relaxation of the film can take place at high temperatures.

[0056] The film then passes through another zone ("cooling zone"), where it is cooled in the last zone.

[0057] Another zone is called the neutral zone and serves to separate zones. The neutral zone is, for example, an empty space without ventilation and is optionally located between the different treatment zones.

[0058] The zones of the cross-stretching system 18 can also be divided differently and / or have different lengths. For example, fewer or shorter neutral zones can be provided, or the neutral zones can be located in different places, even additionally. Changes to the other zones are also conceivable.

[0059] After the transverse stretching system 18, the now biaxially stretched film passes through the tension roller system and / or edge treatment device 22 and is wound up by means of the winding device 24.

[0060] It is also conceivable that the system 10 is designed in a different way, for example that it has a simultaneous stretching system 26 as a stretching system alternatively or additionally to the longitudinal stretching system 16 and / or to the transverse stretching system 18 with a furnace 20.

[0061] Figure 2 The winding device 24 is shown in isolation and in a schematic view.

[0062] The winding device 24 shown is used for winding the material web B, but can also be used for unwinding such a material web B.

[0063] The winding device 24 has a frame 28 and two winding sleeves 30 which are inserted into the frame 28.

[0064] The winding sleeve 30, for example, has a length of at least 10 m, in particular at least 12 m, and further, in particular at least 14 m, and / or a weight of over 20,000 kg, in particular over 25,000 kg. For example, a winding bale, i.e., a winding sleeve with a material web B wound on it, has a weight of over 30 t up to 34 t, or even more.

[0065] The frame 28 has two sections, namely a first section 32 and a second section 34.

[0066] Sections 32 and 34 are arranged on different sides of the material web B, with the first section 32 being on the operator side (in Figure 2 , left) of the winding device 24 or of the system 10 and the second section 34 opposite the first section 32 on the drive side of the winding device 24 or of the system 10.

[0067] The frame 28 also has a first wheel 36, which is provided on the first section 32, and a second wheel 38, which is provided on the second section 34. The wheels 36 and 38 are aligned coaxially with each other and are rotatable relative to the rest of the frame 28.

[0068] The wheels 36, 38 form two receptacles 40 for the winding sleeves 30, each receptacle 40 having a first clamping device 42 and a second clamping device 44. The first clamping device 42 of each receptacle 40 is attached to the first wheel 36 of the first section 32, and the second clamping device 44 is attached to the second wheel 38 of the second section 34 of the frame 28.

[0069] The first clamping devices 42 are thus provided on the operator side and the second clamping devices 44 on the drive side of the winding device 24.

[0070] Only one of the first clamping devices 42 is described below as an example. The other first clamping devices 42 are identical in design.

[0071] The first clamping device 42 has a base 46, a clamping head 48, a locking mechanism 50, a first actuator 52, a second actuator 54, a cylinder 56 and a cover 58.

[0072] In the illustrated embodiment, the base 46, the clamping head 48, the locking mechanism 50, the cylinder 56, and the cover 58 are provided on the first wheel 36. The first actuator 52 and the second actuator 54 can also be attached to the first wheel 36 or be rigidly connected to the static parts of the frame 28.

[0073] The Figures 3 and 4 The first clamping device 42 is shown in a sectional view at the first wheel 36 in the extended position of the clamping head 48 or in the retracted position of the clamping head 48.

[0074] As in the Figures 3 and 4 As can be seen, the first wheel 36 has an opening in the area of ​​the first clamping device 42.

[0075] The opening of the first wheel 36 or the axis of rotation of the first wheel 36 defines the axial direction A of the winding device 24.

[0076] The base 46 extends through the opening and is designed as a bearing, e.g. ball bearing, and is connected to the first wheel 36, in particular in a rotationally fixed manner.

[0077] It is also conceivable that the base 46 is part of the first wheel 36, i.e., part of the frame 28.

[0078] Through the opening and the base 46, the cylinder 56 extends in axial direction A.

[0079] The clamping head 48 is attached to the cylinder 56 at the end facing the second wheel 38, in particular in a rotationally fixed manner.

[0080] The clamping head 48 has a conical engagement section 60 at its end facing the second wheel 38, the diameter of which increases towards the first wheel 36.

[0081] The engagement section 60 is designed in a manner known per se to engage with one of the winding sleeves 30 and to be clamped with it.

[0082] The clamping head 48 can be moved axially by means of the second actuator 54. For this purpose, the second actuator 54 is connected to the cylinder 56 and can move it back and forth axially, so that the clamping head 48 also moves back and forth. In this way, the clamping head 48 can assume an extended position as well as a retracted position, whereby the distance a between the end face of the clamping head 48 and the first wheel 36 is greater in the extended position than in the retracted position.

[0083] The stroke, i.e. the difference in distance a between the extended position and the retracted position, is between 5 and 20 cm, in particular 10 cm.

[0084] The second actuator 54 is, for example, a hydraulic cylinder or an electric cylinder.

[0085] The locking mechanism 50 is arranged axially between the clamping head 48 and the first wheel 36.

[0086] The locking mechanism 50 has a first locking element 62 and a second locking element 64.

[0087] The second locking element 64 is supported in axial direction A on the base 46 and is rotatably mounted relative to the base 46.

[0088] The cover 58 of the first clamping device 42 covers the second locking element 64 in a radial direction. This is also attached to the base 46 or to the first wheel 36.

[0089] The locking mechanism 50, i.e. the first locking element 62 and the second locking element 64, are also hollow, and the cylinder 56 extends through the first locking element 62 and the second locking element 64, in particular coaxially.

[0090] The locking mechanism 50 can assume a locking position and a release position, wherein the locking mechanism 50 has a greater axial length in the locking position than in the release position. This difference in length corresponds in particular to the stroke of the clamping head 48, i.e., the length of the axial movement of the clamping head between the extended position and the retracted position.

[0091] The Figures 5 and 6 show a section through the locking mechanism 50 along lines VV of the Figure 3 or the VI-VI line of the Figure 4 , wherein the locking mechanism 50 is located in the Figure 5 shown position in the locking position and in Figure 6is in the release position.

[0092] Figure 7 shows the locking mechanism 50, in this example the first locking element 62 and the second locking element 64 isolated in an exploded view.

[0093] It is easy to see in Figure 7 In this embodiment, the first locking element 62 is a splined shaft 66 and the second locking element 64 is a splined hub 68. It is also conceivable that the first locking element is the splined hub and the second locking element is the splined shaft.

[0094] The splined shaft 66 has several drive lugs 70 that extend radially outwards around its circumference. In the example shown, the splined shaft 66 has six drive lugs 70 that are evenly distributed around its circumference.

[0095] The drive lugs 70 of the splined shaft 66 are flattened towards the splined hub 68.

[0096] The splined hub 68 is designed to be complementary to the splined shaft 66.

[0097] The keyed hub 68 has grooves 72 on its inner wall, which are designed to be complementary to the drive lugs 70. The grooves 72 extend axially A through the keyed hub 68. In the example shown, the keyed hub 68 has six grooves 72.

[0098] Between the grooves 72, a projection is provided in the circumferential direction, which is flattened towards the splined shaft 66, i.e. in the direction of the second wheel 38.

[0099] The first locking element 62, in this case the splined shaft 66, is connected axially to the clamping head 48. This can be done directly, for example by means of a screw connection, or indirectly by fastening it to the cylinder 56.

[0100] The first locking element 62, in this example the splined shaft 66, and the clamping head 48 are in particular fixed to each other in a rotationally fixed manner.

[0101] For the sake of simplicity, reference will sometimes be made only to the splined shaft 66 or splined hub 68, whereby these more generally refer to the first locking element 62 or second locking element 64, even if these are not designed as a hub or shaft.

[0102] The first actuator 52 is connected to the splined hub 68 in such a way that it can rotate the splined hub 68 relative to the base 46 and thus also relative to the splined shaft 66. For this purpose, a radial pin 74 can be attached to or formed on the splined hub 68, as shown in the Figures 5 and 6 can be seen.

[0103] The rotation of the splined hub 68 relative to the splined shaft 66 takes place between the locking position and the release position.

[0104] In the locking position, which is in the Figures 3 and 5As can be seen, the drive lugs 70 of the splined shaft 66 are aligned with the projections of the splined hub 68. Furthermore, the splined shaft 66 has been axially extended out of the splined hub 68. In this position, the splined shaft 66 cannot be inserted into the splined hub 68, as there is now a positive-locking connection between the drive lugs 70 of the splined shaft 66 and the projections of the splined hub 68.

[0105] If the first locking element 62 and the second locking element 64 are now rotated relative to each other, for example by rotating the keyed hub 68, the drivers 70 of the keyed shaft 66 are now aligned with the grooves 72 of the keyed hub 68.

[0106] The positive locking connection is released, and the splined shaft 66 can now be moved axially into the splined hub 68. The drive lugs 70 engage in the grooves 72.

[0107] This corresponds to the release position, since an axial relative movement between the first locking element 62 and the second locking element 64, i.e. between the splined shaft 66 and the splined hub 68, is now possible.

[0108] Using the locking mechanism 50, the clamping head 48 can be locked in its extended position as follows in order to clamp a winding sleeve 30.

[0109] Starting from the in Figure 4 In the retracted position shown, a winding sleeve is first placed coaxially to the clamping head 48 in front of the clamping head 48, i.e. between the first and the second clamping device 42, 44.

[0110] The clamping head 48 is then subjected to a force in axial direction A by means of the second actuator 54, causing the clamping head 48 to move towards the winding sleeve 30 and engage with it. The second actuator 54 can apply a force of more than 20 kN and / or up to 25 kN to the clamping head 48.

[0111] Here, the conical engagement section 60 centers the winding sleeve 30 relative to the clamping head 48 and the cylinder 56. The extended position of the clamping head 48 is now reached.

[0112] During the axial movement of the clamping head 48, the first locking element 62, i.e. the splined shaft 66, is also moved in the axial direction and is moved out of the second locking element 64, i.e. the splined hub 68.

[0113] Due to the weight of the winding sleeve 30, the second actuator 54 must first provide the necessary force to hold the clamping head 48 in its extended position.

[0114] To lock the clamping head 48 in the extended position, the locking mechanism 50 is now actuated.

[0115] In this process, the first actuator 52 rotates the first locking element 62 and the second locking element 64, i.e., the splined shaft 66 and the splined hub 68, relative to each other.

[0116] In the illustrated embodiment, the first actuator 52 applies a torque to the splined hub 68, causing it to rotate relative to the splined shaft 66. In the illustrated embodiment, the rotation is approximately 30°.

[0117] The drive lugs 70 of the splined shaft 66 now aligned with the projections of the splined hub 68, and the second actuator 54 is switched off.

[0118] Subsequently, the other of the clamping devices 44, 42, for example the second clamping device 44 on the drive side, exerts an axial force on the winding sleeve 30 in the direction of the opposite clamping device 42, 44. This also exerts an axial force on the clamping head 48 and thus on the first locking element 62, i.e. the splined shaft 66, in the direction of the splined hub 68.

[0119] This causes the splined shaft 66 to move towards the splined hub 68, causing the grooves 72 to strike the projections and preventing the splined shaft 66 from being inserted into the splined hub 68.

[0120] The splined shaft 66 is thus supported axially on the splined hub 68, which also supports the clamping head 48 on the splined hub 68. The clamping head 48 is therefore locked in its extended position. In this way, clamping forces of at least 25 kN up to 30 kN can be absorbed by the locking mechanism 50.

[0121] The flattened areas or protrusions of the drive lugs 70 increase the tension and thus provide more stability.

[0122] There is thus a positive fit between the first locking element 62 and the second locking element 64, which prevents the clamping head 48 from being moved from its extended position back to its retracted position. The locking mechanism 50 forms a fixed stop for the clamping head 48, which reliably holds the clamping head 48 in the extended position without the active application of a permanent force, for example by the second actuator 54 or by springs.

[0123] In this way, a particularly reliable, passive and also space-saving first clamping device 42 is provided.

[0124] The first clamping device 42 described above can also be designed as a second clamping device 42 on the second wheel 38 in the winding device 24.

[0125] Each of the following forms a first clamping device 42 and a second clamping device 44: one of the receptacles 40, wherein the clamping heads 48 of the clamping devices 42, 44 of the same receptacle 40 are designed coaxially to each other.

[0126] The winding sleeve 30, held in a receptacle 40, is thus rotatably held in the receptacle by the clamping heads 48 of the respective first clamping device 42 and the second clamping device 44. At the same time, both clamping heads 48 are axially movable, so that to remove and insert a winding sleeve 30 into the receptacle 40, both clamping heads 48 can be moved out of or into the winding sleeve 30 without the winding sleeve 30 itself having to be moved axially.

[0127] This greatly simplifies the changing of the winding sleeve 30, especially when it is loaded with a winding bale of the material web B.

[0128] In another embodiment, the second clamping devices 44 can be used as in Figure 8 The second clamping device 44 is shown in the illustration. Figure 8 also features an axially adjustable clamping head 48 with cylinder 56, which is attached to the second wheel 38, with the cylinder 56 extending through the second wheel 38.

[0129] The second clamping device 44 additionally features a hydraulic cylinder 78 with a piston rod 80, to which a spring assembly 76 is attached. The hydraulic cylinder 78 also includes a clamping device 82, which can lock the piston rod 80 in a position.

[0130] The piston 80 is connected to the cylinder 56, so that the cylinder 56 and thus also the clamping head 48 can be adjusted in the axial direction by the hydraulic cylinder 78 of the clamping device 44.

[0131] For clamping, the hydraulic cylinder 78 is actuated to move the clamping head 48 into the winding sleeve 30.

[0132] Once the clamping head 48 is fully retracted into the winding sleeve 30, the hydraulic cylinder 78 remains actuated, pressing the spring assembly 76 against the cylinder 56 or a mounting of the cylinder, thereby tensioning it. The hydraulic cylinder 78 remains actuated until the spring assembly 76 is tensioned to a preset force.

[0133] Once the predetermined force is reached, the clamping device 82 is actuated and the piston rod 80 is locked. The hydraulic cylinder 78 can now be switched off, so that the clamping force is maintained solely by the spring assembly 76.

[0134] The clamping device according to the second embodiment therefore has no locking mechanism that forms a fixed stop for the clamping head, since the spring assembly 76 does not form a fixed stop. Rather, the spring assembly 76 actively exerts a force continuously to hold the clamping head 48 in its extended position and to maintain the axial force required to transmit a torque via the (conical) connection between the clamping head 48 and the winding sleeve 30.

[0135] When the chuck 48 is fully inserted into the winding sleeve 30, a torque can be transmitted to the winding sleeve 30 via the chuck 48. The winding sleeve 30 can then be rotated by means of a motor 84, for example an electric motor.

[0136] The motor 84 is connected to the chuck head 48 in a rotationally fixed manner and is designed to set the chuck head 48 into rotation, so that the winding sleeve 30 clamped on it is set into rotation.

[0137] For example, the clamping head 48 is rotatably mounted on the cylinder 56.

[0138] The winding sleeve 30 of the first embodiment can be rotated in the same way.

Claims

1. Clamping device for clamping a winding sleeve (30), comprising a base (46), a clamping head (48) and a locking mechanism (50), wherein the locking mechanism (50) is adjustable between a locking position and a release position, wherein the clamping head (48) is axially movable relative to the base (46) between an extended position and a retracted position, and wherein the locking mechanism (50) in the locking position axially locks the clamping head (48) in the extended position and forms a fixed stop for the clamping head (48).

2. Clamping device according to claim 1, characterized by the fact thatthe locking mechanism (50) is designed such that it locks the clamping head (48) in the extended position up to a maximum clamping force of at least 25 kN to 30 kN; it prevents axial movement of the clamping head (48) from the extended position to the retracted position by means of a positive locking mechanism in the locking position; and / or that its length in the axial direction (A) is longer in the locking position than in the release position, in particular wherein a difference in length between the locking position and the release position corresponds to the axial movement of the clamping head (48) between the extended position and the retracted position.

3. Clamping device according to claim 1 or 2, characterized by the fact thatthe locking mechanism (50) comprises a first locking element (62) and a second locking element (64), wherein the first locking element (62) and the second locking element (64) are positively connected to each other in the axial direction (A) in the locking position of the locking mechanism (50), in particular wherein the first locking element (62) is supported on the second locking element (64) in the axial direction in the locking position.

4. Clamping device according to claim 3, characterized by the fact that the first locking element (62) is a splined shaft (66) and the second locking element (64) is a splined hub (68), or vice versa, which engage in each other in the locking position, in particular wherein the splined shaft (66) and the splined hub (68) are aligned coaxially to each other and / or coaxially to the clamping head (48).

5. Clamping device according to claim 3 or 4, characterized by the fact thatthe first locking element (62) is fixed in the axial direction (A) on the clamping head (48) and / or is rotationally fixed to the clamping head (48), and / or that the second locking element (64) is supported in the axial direction (A) on the base (46).

6. Clamping device according to one of the preceding claims, characterized by the fact that the clamping device (42, 44) has a cylinder (56) to which the clamping head (48) is fixed, wherein the cylinder (56) extends through the locking mechanism (50), in particular through the first locking element (62) and the second locking element (64).

7. Clamping device according to one of the preceding claims, characterized by the fact thatthe clamping device (42, 44) has a first actuator (52) for actuating the locking mechanism (50), wherein the locking mechanism (50) is adjustable between the locking position and the release position by the first actuator (52), in particular wherein the first actuator (52) is connected to the first locking element (62) or the second locking element (64) in such a way that it can apply a torque to the corresponding locking element (62, 64).

8. Clamping device according to one of the preceding claims, characterized by the fact that the clamping device (42, 44) has a second actuator (54) which is connected to the clamping head (48), in particular by means of the cylinder (56), in such a way that it can apply a force in the axial direction (A) to the clamping head (48), in particular a force of more than 20 kN and / or up to 25 kN.

9. Clamping device according to one of the preceding claims, characterized by the fact thatthe chuck (48) has a conical engagement section (60).

10. Winding device for winding or unwinding a flat material web (B), in particular a film, with a frame (28) which has at least one receptacle (40) for a winding sleeve (30), wherein the at least one receptacle (40) has a first clamping device (42) and a second clamping device (44), wherein at least the first clamping device (42) is a clamping device (42) according to one of the preceding claims.

11. Winding device according to claim 10, characterized by the fact that the winding device (24) has at least one winding sleeve (30), in particular wherein the winding sleeve (30) has a length of at least 10 m, in particular at least 12 m, further in particular at least 14 m, and / or a weight of over 20,000 kg, in particular over 25,000 kg.

12. Winding device according to claim 10 or 11, characterized by the fact thatthe second clamping device (44) is a clamping device (44) with an axially adjustable clamping head, in particular a clamping device (42, 44) according to one of claims 1 to 9.

13. Winding device according to one of claims 10 to 12, characterized by the fact that the frame (28) has two opposing rotatable wheels (36, 38), wherein at least the clamping head (48) and the locking mechanism (50) of the first clamping device (42) are attached to a first of the wheels (36), and at least the clamping head (48) of the second clamping device (44) is attached to a second of the wheels (38), in particular wherein the frame (28) has at least two of the receptacles (40), in particular wherein at least the clamping heads (48) and the locking mechanisms (50) of the first clamping devices (42) of the receptacles (40) are attached to the first wheel (36) and at least the clamping heads (48) of the second clamping devices (44) of the receptacles (40) are attached to the second wheel (38).

14. Winding device according to one of claims 10 to 13, characterized by the fact that the first clamping device (42) is arranged on an operator side of the winding device (24), and / or wherein the base (46) is immovably fixed to the frame (28), in particular to the respective wheel (36, 38), and / or is a part of the frame (28), in particular of the respective wheel (36, 38).

15. Plant for the production of a material web (B), in particular a film production plant, with a winding device (24) according to one of claims 10 to 14.

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