Pressure roller and method for winding

Abstract

The invention relates to a pressure roller (21) for a winding apparatus and a method for winding flat material, tapes, films or the like, wherein the pressure roller can be used to apply pressure to the flat material on a winding spool, wherein the pressure roller is formed with an outer shell (27) made of metal, wherein the pressure roller is rotatably mounted on a positioning device and can be arranged on the winding spool by means of the positioning device, wherein the pressure roller has an axis (22) with a bearing apparatus (23) for rotatable bearing of the pressure roller, wherein the pressure roller is formed with a damping apparatus (29) having at least one vibration damper (30).

Description

[0001] Pressure roller and winding method

[0002] The invention relates to a pressure roller for a winding device and a method for winding flat material, tapes, films or the like, wherein a contact pressure can be exerted on the flat material on a winding spool by means of the pressure roller, wherein the pressure roller is designed with an outer shell made of metal, wherein the pressure roller is rotatably mounted on a positioning device and can be arranged on the winding spool by means of the positioning device, wherein the pressure roller has an axle with a bearing device for rotatably mounting the pressure roller.

[0003] Such pressure rollers are regularly also referred to as smoothing rollers and are used when winding flat material onto a winding spool using a reel. The flat material can be flat strips or foils made of metal or other materials, such as plastic. When the flat material is wound, the pressure roller lies against the flat material so that it is pressed against a coil on the winding spool. During winding, this allows air to be forced out of the coil and ensures that the coil is wound smoothly and with straight edges onto the winding spool. Furthermore, the pressure roller is held on a positioning device by means of which the pressure roller can be applied to the coil with a pressure force and can also be adjusted relative to the winding spool or the coil in order to ensure that the flat material is wound straight onto the coil.

[0004] When winding the flat material onto the winding spool, a shoulder can form on the surface of the coil due to the beginning or strip start of the flat material of a wound coil. Such non-roundness of the coil surface can also arise from turns of the flat material running diagonally onto the coil. A non-round surface of the coil then causes the pressure roller to vibrate, resulting in dynamic mass forces that overlap with a static contact force of the pressure roller. A pressure roller vibrating in this way can lead to shock loading of the coil by the pressure roller and damage to the flat material and the pressure roller. A pressure roller of this type is known, for example, from DE 3939561 CI.

[0005] For relatively thin flat materials, such as foils or the like, which are also wound up at high speeds using a reel, it is therefore common practice to use pressure rollers whose casings are coated with an elastomer to dampen vibrations. However, such pressure rollers wear out relatively quickly and are susceptible to surface damage. For relatively thick flat materials, which are wound up at a relatively low speed using a reel, elastomer-coated pressure rollers are hardly suitable, so pressure rollers with an outer casing made of a wear-resistant material, such as steel, are regularly used here. These pressure rollers are insensitive to wear but susceptible to vibrations.While it is known to dampen vibrations of the pressure roller via the positioning device, for example, by means of a shock absorber on a pivoting lever of the positioning device, a step at the beginning of a strip can cause the entire pressure roller to vibrate, which can only be inadequately suppressed by a damper on the pivoting lever. A winding device can therefore also comprise a number of different pressure rollers, which are used depending on the flat material to be wound and are mounted on the positioning device.

[0006] The present invention is therefore based on the object of proposing a pressure roller and a method for winding flat material which enables low-vibration and simple winding of flat material.

[0007] This object is achieved by a pressure roller having the features of claim 1, a winding device having the features of claim 12 and a method having the features of claim 13.

[0008] With the pressure roller according to the invention for a winding device for winding flat material, tapes, films or the like, a contact pressure can be exerted on the flat material on a winding spool, wherein the pressure roller is designed with an outer shell made of metal, wherein the pressure roller is rotatably mounted on a positioning device and can be arranged on the winding spool by means of the positioning device, wherein the pressure roller has an axle with a bearing device for the rotatable mounting of the pressure roller, wherein the pressure roller is designed with a damper device with at least one vibration damper.

[0009] The pressure roller therefore has a comparatively wear-resistant casing, which can be made of steel, for example. In principle, the casing can also be made of other materials with high hardness, such as ceramic or the like, or coated with such materials. This ensures that the casing wears only minimally, regardless of the type of flat material being wound. At the same time, the dampening device on the pressure roller can dampen any vibrations resulting from defects or out-of-roundness in a coil, which are transmitted to the pressure roller via the casing. For this purpose, the dampening device comprises at least one vibration damper on the pressure roller.Consequently, the damping device is not formed on the positioning device, but directly on the pressure roller, so that any vibrations of the pressure roller casing are not transmitted to the positioning device and can be directly absorbed by the pressure roller or the vibration damper. This means that a smaller mass is set into vibration, which also makes it easier to dampen the vibration of the pressure roller. Nevertheless, the positioning device can also be equipped with a vibration damper, which is arranged, for example, on a pivot arm of the positioning device. Since, according to the invention, vibration damping already takes place in the area of ​​the pressure roller, the pressure roller can also be advantageously used for comparatively thin flat materials and is therefore universally applicable.The reduced wear of the pressure roller and its versatility can save costs when winding flat materials.

[0010] The damper device can comprise at least two or more vibration dampers, which can be arranged symmetrically or asymmetrically relative to a median plane of the pressure roller along the axis and / or the casing. Two vibration dampers can then be positioned at an equal distance from a center or a center of mass of the pressure roller. Alternatively, two vibration dampers can be at an unequal distance from the center or can be designed differently. The vibration dampers can be different in size and shape. In principle, however, it is also possible to design the vibration damper so that it extends along the axis or the casing. Furthermore, a plurality of vibration dampers can be provided, which are arranged at a substantially equal relative distance along the axis or the casing.The vibration dampers can then dampen vibrations relatively evenly around the circumference of a bundle.

[0011] The axle can be connected to the positioning device via at least one bearing of the pressure roller, which can rotatably hold the axle on the positioning device, wherein the at least one vibration damper can connect the axle to the casing. Accordingly, the axle can then be connected directly to the positioning device via the bearing. In all cases, the bearing can be a plain bearing or a roller bearing, wherein the positioning device can be designed with a pivot arm on which the bearing can be arranged. It can also be provided that at least two bearings hold the axle rotatably, wherein the bearings are preferably arranged at the respective ends of the axle. The at least one vibration damper can then be arranged between the axle and the casing and directly connect the axle to the casing.In this embodiment, it is advantageous that a mass of the pressure roller, which could be excited to oscillate by a collar, is comparatively small, since any oscillation is dampened by at least one vibration damper before it could be transmitted to the axle.

[0012] In a further embodiment, the axle or at least one bearing of the pressure roller can be connected to the positioning device, which can hold the axle rotatably on the positioning device, wherein the at least one vibration damper can connect the axle to the bearing or the bearing to the positioning device. Accordingly, the vibration damper can in any case be arranged on the bearing, wherein the vibration damper can be arranged between the axle and the bearing or between the bearing and the positioning device. Here, too, it is then possible to dampen vibrations of the pressure roller by means of the vibration damper without these vibrations being transmitted to the positioning device or a pivot arm of the positioning device.

[0013] In a further embodiment, the casing can be connected to the axle via at least one bearing of the pressure roller, which bearing can rotatably support a casing on the axle, wherein the at least one vibration damper can connect the casing to the bearing or the bearing to the axle. Accordingly, the axle can be fixedly arranged on the positioning device, and the bearing can then be arranged between the casing and the axle. Here, too, the vibration damper can then be arranged on the bearing in any case, wherein the vibration damper can be arranged between the casing and the bearing or between the bearing and the axle. Here, too, a mass of the pressure roller that can be set into vibration can then be comparatively small.

[0014] The vibration damper can form a cavity, which can be filled with a fluid, preferably air, and pressurized. Alternatively, another compressible gas can be used for vibration damping. Depending on the pressure level in the cavity, the vibration damper can be designed to be more or less elastic. A low pressure results in a comparatively soft damping behavior of the damping device, and a comparatively high pressure results in a harder damping behavior. The vibration damper can therefore be designed as a pneumatic spring.

[0015] The damper device can comprise a pressure regulating device by means of which the pressure in the vibration damper can be generated. In a simple embodiment, the pressure regulating device can also be a static valve by means of which the pressure in the vibration damper is kept constant. Depending on the operating requirements, the pressure in the vibration damper can then first be generated via a pump, line or the like, and then the valve can be closed. The pressure roller can then be used independently of the pump or line. In one embodiment, the damper device can also be permanently connected to the pressure regulating device, i.e. via a line. This makes it possible to vary the pressure in the vibration damper before and during operation of the pressure roller and to adapt it to changing operating conditions. For this purpose, the pressure regulating device can have a pressure sensor and a control valve.

[0016] The vibration damper can be connected to the pressure control device via a fluid line, whereby the axle can form the fluid line, at least in part. If the axle is rotatable relative to the positioning device, the fluid can also be introduced into the vibration damper via a rotary feed and the axle. This is particularly advantageous when the vibration damper is arranged between the axle and the casing. The fluid line can be formed by a central bore in the axle. The fluid line then comprises the axle, the rotary feed, and a connecting line connected to the rotary feed with the pressure control device.

[0017] The pressure roller can comprise at least one vibration sensor and a control device, wherein vibrations of the casing can be detected by means of the vibration sensor, wherein the control device can be configured to regulate the pressure according to the vibrations, a speed of the pressure roller and / or a thickness of the flat material. The vibration sensor can be arranged on the casing or on other parts of the pressure roller that are directly exposed to vibrations caused by a coil. The vibration sensor can then directly detect or measure the vibrations of the casing. The control device, which can be a data processing device, for example a computer or a programmable logic controller, can process the measured values ​​or data from the vibration sensor.Furthermore, a rotational speed of the pressure roller or the winding spool or the reel can be recorded, for example by means of a rotary encoder or the like. Here, too, the control device can process data or values ​​from a rotational speed measurement. Furthermore, a thickness of the flat material can be stored or specified in the control device. However, the thickness of the flat material can also be measured with a sensor and transmitted to the control device for processing. In particular, the control device can determine a diameter of a coil and thus a peripheral speed of the flat material of the coil during winding. Since the rotational speed or peripheral speed as well as the thickness of the flat material can influence the generation of vibrations in the pressure roller, the control device can adjust the pressure so that these vibrations are avoided as far as possible.If vibrations are detected by the vibration sensor, the pressure can be changed to such an extent that these vibrations are eliminated or minimized.

[0018] The vibration damper can be designed with at least one damping element made of an elastic material. The elastic material can be an elastomer or rubber. In principle, it would also be possible to design the vibration damper in the manner of a gas spring, however, a damping element made of an elastic material is much more cost-effective to manufacture.

[0019] The damper element can be designed as two annular diaphragms, as an annular or helical hose, or as a tire. The annular diaphragms can, for example, be arranged between the casing and the axle in such a way that a cavity for receiving the fluid is formed between the casing and the axle. Alternatively, an annular hose can form the damper element, in which case the hose can also simply be arranged between the axle and the casing, or alternatively on a bearing. Such a hose is particularly simple to manufacture, can be easily replaced, and requires no special sealing. The vibration damper can also be helical or helical. The vibration damper can then be wound around the axle and is particularly easy to install. A plurality of helical or helical vibration dampers can also be provided.Furthermore, the damper element can be formed by a tire, which is arranged similarly to a hose between the casing and the axle or a bearing. The tire then has only a radial surface that rests against the axle or the casing. Preferably, the radial surface can rest against the casing, so that the tire is then open relative to the axle. Side surfaces or beads of the tire can then form a sealing connection with the axle. This makes it easy to supply fluid to a cavity within the tire via the axle.

[0020] The winding device according to the invention for winding flat material, strips, foils, or the like comprises a reel and a pressure roller according to the invention. The reel can have a winding spool. Further advantageous embodiments of the winding device emerge from the feature descriptions of the subclaims referring back to claim 1.

[0021] In the method according to the invention for winding flat material, strips, films or the like, flat material is wound onto a winding spool by means of a reel, wherein a pressure roller exerts contact pressure on the flat material on the winding spool, wherein the pressure roller is formed with an outer shell made of metal, wherein the pressure roller is rotatably mounted on a positioning device having an axle and a bearing device for the pressure roller and is arranged on the winding spool by means of the positioning device, wherein vibrations of the pressure roller are dampened by a damping device of the pressure roller with at least one vibration damper. The damping device is formed in particular on the pressure roller. For the advantages of the method according to the invention, reference is made to the description of the advantages of the device according to the invention.

[0022] Vibrations can be detected using a vibration sensor on the pressure roller. The vibration sensor can be positioned on the pressure roller in such a way that vibrations of the casing are detected or measured.

[0023] A control device can regulate the stiffness of at least one vibration damper of the damper device according to vibrations of the pressure roller, a speed of the pressure roller, and / or a thickness of the flat material. The stiffness can be regulated by adjusting the pressure within a cavity of the vibration damper via a fluid pressure of a fluid located in the cavity. The pressure can then be adjusted as a manipulated variable by the control device such that the vibrations are reduced or eliminated as a disturbance variable as much as possible. Furthermore, it can also be provided that the control device regulates the speed of the reel and / or the pressure roller, whose speed depends on the speed of the reel, in order to reduce or eliminate vibrations. This can be done taking into account the thickness of the flat material.

[0024] The control device can regulate the stiffness of the at least one vibration damper such that the vibrations of the pressure roller are reduced by the vibration damper. The stiffness can then be adjusted such that the vibration damper absorbs the vibrations essentially completely or partially.

[0025] The pressure roller can be used to press flat material with a thickness ranging from 0.001 mm to 25 mm, preferably 0.1 mm to 10 mm. The pressure roller can therefore be used to press both comparatively thin and thick flat material. Replacing the pressure roller for different material thicknesses is therefore no longer necessary.

[0026] Further advantageous embodiments of the method emerge from the descriptions of the features of the subclaims referring back to claim 1.

[0027] The invention is explained in more detail below with reference to the accompanying drawings.

[0028] They show:

[0029] Fig. 1 : a schematic side view of a winding device;

[0030] Fig. 2: a longitudinal sectional view of a pressure roller.

[0031] Fig. 1 shows a winding device 10 for winding and unwinding a strip 11 made of metal, wherein a reel (not shown in detail here) has a reel mandrel 12 for receiving a winding spool 13 with a coil 14. The winding device 10 comprises a pressure roller 15 which is attached to a pivoting lever 16 of a positioning device 17 and which can be lowered onto the coil 14 and lifted off the coil 14 by means of a pressure cylinder 18 acting on the pivoting lever 16. The pressure roller 15, which is rotatably attached to the pivoting lever 16, is pressed against the coil 14 by two actuating cylinders 20 acting on ends 19 of the pressure roller 15 during winding or unwinding of the strip 11 onto or from the winding spool 13, wherein the actuating forces of the actuating cylinders 20 are controllable. A diameter D of the collar 14 changes during the winding or unwinding of the band 11 according to the exemplary representation in Fig. 1.

[0032] Fig. 2 shows a pressure roller 21 such as can be used with the winding device described in Fig. 1. The pressure roller 21 is formed with an axle 22 and a bearing device 23, wherein the bearing device 23 is formed by two bearings 24 at each end 25 of the axle 22. The bearings 24 are each arranged on a pivot arm 26 on a positioning device not shown in detail here. Furthermore, the pressure roller 21 comprises a casing 27 which is made entirely of metal and whose surface 28 serves to exert a contact pressure on flat material on a winding spool.

[0033] The pressure roller 21 is formed with a damper device 29 with two vibration dampers 30. The vibration dampers 30 are in turn formed by damper elements 31, which consist of an elastic material and are designed here as tires 32. The damper elements 31 are each arranged on a ring 33 formed on the axle 22, with beads 34 of the tire 32 sealingly abutting against an annular shoulder 35 of the ring 33. A cavity 36 formed in this way is now filled with a fluid, in particular air, with the air being pressurized by means of a pressure regulating device (not shown here). For this purpose, the cavity 36 is connected to the pressure regulating device via a fluid line 37, which is formed within the axle 22 by a channel 38 and a rotary feed 39 connected to the channel 38.Depending on the requirements or occurring vibrations, the pressure control device can now change the pressure in the damping elements 3 1 in such a way that vibrations are minimized as far as possible.

Claims

Patent claims 1. Pressure roller (15, 21) for a winding device (10) for winding flat material, tapes (11), films or the like, wherein a contact pressure can be exerted on the flat material on a winding spool (13) by means of the pressure roller, wherein the pressure roller is designed with an outer casing (27) made of metal, wherein the pressure roller is rotatably mounted on a positioning device (17) and can be arranged on the winding spool by means of the positioning device, wherein the pressure roller has an axle (22) with a bearing device (23) for the rotatable mounting of the pressure roller, characterized in that the pressure roller is designed with a damper device (29) with at least one vibration damper (30).

2. Pressure roller according to claim 1, characterized in that the damper device (29) comprises at least two or more vibration dampers (30) which are arranged symmetrically or asymmetrically relative to a median plane of the pressure roller (15, 21) along the axis (22) and / or the casing (27).

3. Pressure roller according to claim 1 or 2, characterized in that the axle (22) is connected to the positioning device (17) via at least one bearing (24) of the pressure roller (15, 21), which rotatably supports the axle on the positioning device, wherein the at least one vibration damper (30) connects the axle to the casing (27).

4. Pressure roller according to claim 1 or 2, characterized in that the axle is connected to the positioning device (17) via at least one bearing of the pressure roller (15), which rotatably supports the axle on the positioning device, wherein the at least one vibration damper connects the axle to the bearing or the bearing to the positioning device.

5. Pressure roller according to claim 1 or 2, characterized in that the casing is connected to the axle via at least one bearing of the pressure roller (15), which rotatably supports the casing on the axle, wherein the at least one vibration damper connects the casing to the bearing or the bearing to the axle.

6. Pressure roller according to one of the preceding claims, characterized in that the vibration damper (30) forms a cavity (36), wherein the cavity is filled with a fluid, preferably air, and can be subjected to pressure.

7. Pressure roller according to claim 6, characterized in that the damper device (29) comprises a pressure control device. by means of which the pressure in the vibration damper (30) can be formed.

8. Pressure roller according to claim 6 or 7, characterized in that the vibration damper (30) is connected to the pressure control device via a fluid line (37), the axis (22) forming the fluid line at least in sections.

9. Pressure roller according to one of claims 6 to 8, characterized in that the pressure roller (15, 21) comprises at least one vibration sensor and a control device, wherein vibrations of the casing (27) can be detected by means of the vibration sensor, wherein the control device is designed to regulate the pressure according to the vibrations, a speed of the pressure roller and / or a thickness of the flat material.

10. Pressure roller according to one of the preceding claims, characterized in that the vibration damper (30) is formed with at least one damper element (31) made of an elastic material.

11. Pressure roller according to claim 10, characterized in that the damper element (31) is designed as two annular membranes, as an annular or helical hose or as a tire (32).

12. Winding device (10) for winding flat material, strips (11), films or the like, with a reel and a pressure roller (15, 21) according to one of the preceding claims.

13. Method for winding flat material, strips (11), films or the like, wherein flat material is wound onto a winding reel (13) by means of a reel, wherein a pressure roller (15, 21) exerts a contact pressure on the flat material on the winding reel, wherein the pressure roller is formed with an outer casing (27) made of metal, wherein the pressure roller is rotatably mounted on a positioning device (17) with an axis (22) and a bearing device (23) of the pressure roller, and is arranged on the winding reel by means of the positioning device, characterized in that vibrations of the pressure roller are damped by a damping device (29) the pressure roller with at least one vibration damper (30) are damped.

14. Method according to claim 13, characterized in that vibrations are detected by means of a vibration sensor on the pressure roller (15, 21).

15. The method according to claim 13 or 14, characterized in that a control device regulates a stiffness of the at least one vibration damper (30) of the damper device (29) according to vibrations of the pressure roller (15, 21), a speed of the pressure roller and / or a thickness of the flat material.

16. Method according to claim 15, characterized in that that the control device regulates the stiffness of the at least one vibration damper (30) such that the vibrations of the pressure roller (15, 21) are reduced by the vibration damper.

17. Method according to one of claims 13 to 16, characterized in that the pressure roller (15, 21) is used for pressing flat material with a thickness in a range of 0.001 mm to 25 mm, preferably 0.1 mm to 10 mm.

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