Patent Application
20100102158
The invention relates to a winder mandrel with radially moveable spreading segments which are arranged on the periphery, a mandrel body and a pulling rod, and a method for operating such a winder mandrel.
Winder systems are used for example in order to wind rolled sheet metal or other materials into a coil on a winder mandrel and/or to unwind a coil. For winding, the spreading segments are deflected radially outwards in such a manner that the outer periphery of the spreading segments forms a circle. In order to unwind a coil, the diameter of the winder mandrel must become smaller than the inner diameter of the coil in order to accommodate the coil. To this end, two diameters can usually be produced in a winder mandrel in a targeted manner, with only a spread, maximum diameter being configured to be completely round.
In known embodiments of winder mandrels of this type, winder segments are deflected radially by means of wedge faces which are moved by means of pulling or pushing rods.
DE 35 02 452 A1 describes a winding and/or unwinding winder for rolled strips, with a drum which consists of a plurality of segments which can be moved in a spreading manner and bear with wedge-shaped sliding surfaces against a winder shaft which is mounted such that it can rotate in a winder housing. A punch is guided in the winder shaft, which punch is connected by means of a connecting flange to the drum segments. An actuator effects a relative axial displacement between the winder shaft and the punch connected to the segments, by means of which displacement a spreading movement of the segments is brought about. Furthermore, the winder has a displacing drive which effects the displacement in and out of the winder drum relative to the coil and/or the strip centre regulator, with the winder shaft being mounted in the stationary winder housing in such a manner that it can be displaced axially, the actuator having in order to subject the winder shaft to a despreading load a piston-cylinder unit which is rotationally fixed but axially displaceable with respect to the stationary winder housing, a pressure spring constantly holding the segments in the spread state, and the displacing drive consisting of a piston-cylinder unit by means of which the winder shaft can be loaded in such a manner that it is displaced axially.
EP 0 504 296 B1 discloses a winder for winding and/or unwinding metal strips with strip traction forces between 10 kN and 1000 kN, consisting of a spreadable winding drum which is supported by a hollow shaft mounted in two places in a stand and can be actuated via a driving rod which runs through the hollow shaft by an actuating cylinder which is arranged on the hollow shaft. Coupled to the hollow shaft is a drive motor which is arranged between the two supports of the hollow shaft and consists of a stator and a rotor. The hollow shaft forms the rotor shaft and the driving rod forms the winding drum shaft which is mounted in the hollow shaft.
German Laid-Open Specification 1 777 229 describes a spreadable winder mandrel for winding strip-shaped rolled material, in particular hot-rolled strips, with an inner mandrel body and a plurality of spreading segments placed on the mandrel body. These spreading segments are supported via tappets on wedge faces of a wedge rod which is mounted concentrically in the mandrel body and has a number of wedge faces, with the spreading segments being connected by Jugs to a wedge rod which is mounted concentrically in the mandrel body.
DE 30 28 607 C2 discloses a rolled strip winder which already has a punch which is pretensioned by spring force, held in the spread position and can be loaded by means of an actuator which is arranged in a stationary and rotationally rigid manner in such a manner that the segments can be despread.
Other winder systems are disclosed in GB 948,419 and U.S. Pat. No. 4,433,814.
JP 051 54 552, JP 2001 252 716, JP 03 275 255 and JP 58 068 425 disclose equipping the spreading segments with magnets. In this case, however, pressure rollers and/or belt wrappers are additionally required during initial winding and slipping out in order to catch the strip during initial winding and guide the strip end. These devices cause costs in manufacture, installation and maintenance. Furthermore, these devices make it more difficult to check the strip as it exits the rolling train/rolling stand. The disadvantage of the known embodiments is that additional lines are let into the shells in order to generate the magnetic force. The windings are exposed and corroded over time as a result of the shells being abraded and the surfaces being reground. In the event of a shell breaking, the magnetic force ceases immediately.
The invention is therefore based on the object of simplifying the known, expensive designs and avoiding the above-mentioned disadvantages. In addition, the service life of the spreading segments is to be increased and the adjustability of the holding force is to be improved. Furthermore, a device is to be created which requires only a small outlay on its construction as a result of the use of as few parts as possible.
This object is achieved according to the invention in that in a winder mandrel with radially movable spreading segments which are arranged on the periphery, a mandrel body and a pulling rod, the spreading segments and/or the mandrel body and/or the pulling rod are configured as magnets. This means that belt wrappers and strip pressure rollers can be dispensed with when winding the strip.
Further refinements of the winder mandrel can be found in the subclaims relating to this.
The invention also relates to a method for operating a winder mandrel with radially movable spreading segments which are arranged on the periphery, a mandrel body and a pulling rod, with the spreading segments and/or the mandrel body and/or the pulling rod being configured as electromagnets and the supply voltage of the electromagnets being switched on during initial winding of the beginning of the strip, lowered during rolling and raised again when the strip is slipped out. This saves energy. The supply voltage is lowered to a fraction or to zero depending on the properties of the strip.
The use of magnets with regulated magnetic force as spreading segments or mandrel bodies or pulling rods means the use of pressure rollers and belt wrappers is avoided. During initial winding, a greater magnetic force is provided. The strip is caught and wound on. The magnetic force can be reduced or switched off during rolling, since the windings of the coil are wound fixedly and are not expected to slip. To slip the strip out, the magnetic force is increased again. The end of the strip thus lies against the coil and can be rotated into a coil lifter.
In order to prevent the rolled up strip from being magnetised, the magnetic field is reverse-polarised after the rolling process and shortly before pulling the coil off the winder mandrel.
Current is supplied to the magnetic components spreading segments or mandrel body or pulling rod by means of a converter. The converter provides an electric current which can be variably adjusted. This is used to influence the magnetic force. Three different methods can be used to supply the spreading segments with electric current:
Winder mandrels in which the spreading segments or the mandrel body or the pulling rod are configured as magnets can be installed directly or subsequently (in exchange) in pay-off reels, tension reels, reversing winders, inspection winders, double spreading head winders.
A further advantage of the winder mandrel according to the invention consists in the straightforward mechanical conversion of existing plant, for example TCM, SPM, CCM, RCM and CSP, for rolling magnetisable materials, since only the winder mandrel has to be exchanged. In new plant, investment costs for belt wrappers, strip pressure rollers and hall foundations are saved.
An exemplary embodiment of the invention is described in more detail using a very schematic drawing. In the figures,
The electrical voltage is transmitted by means of a slip ring 5 which is connected to the pulling rod 4. If the pulling rod 4 or the mandrel body 3 are configured as magnets, greater magnetisation forces must be taken into account since the spreading segments 2 must also be magnetised.
1. Winder mandrel
2. Spreading segment
3. Mandrel body
4. Pulling rod
5. Slip ring
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2007 303 459.7 | Jun 2007 | DE | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/EP2008/002927 | 4/14/2008 | WO | 00 | 12/18/2009 |
