This application is a U.S. National Stage Application of International Application No. PCT/EP2011/064806 filed Aug. 29, 2011, which designates the United States of America, and claims priority to EP Patent Application No. 10176982.6 filed Sep. 16, 2010. The contents of which are hereby incorporated by reference in their entirety.
The disclosure relates to a coil transfer device, e.g., for transferring a metal coil in a coil box.
In rolling mill technology, a type of installation is known in which a roughing pre-strip arriving from the roughing train is wound into a coil in what is known as a coil box and is then unwound for further processing and supplied to a finishing train. A coil box is a strip reeling device that first bends the metal strip arriving from the r train by means of rotationally-driven bending rollers, such that it is wound into a metal coil in a winding cradle formed by support rollers. When the metal coil has been fully wound, the end of the strip becomes the strip head in the subsequent finishing and rolling process. As long as the metal coil is in this winding position, the coil box cannot accept any further strips.
In order to guarantee as large as possible a throughput of material, the unwinding process is already started while the metal coil is still in its winding position. Attempts are made to clear this location as quickly as possible so that the next rough strip approaching can be wound. In order to create this space, a change in the position of the coil is required in the coil box, that is, from the winding position into an unwinding position located in the direction of the finishing train.
Since, by virtue of its temperature, the metal coil in the coil box is easily deformable, the transfer should be done as gently as possible since damage can otherwise occur to the outer layer of the metal coil if the coil is subjected to a hard impact against an abutment, for example.
Document DE 198 03 091 A1 discloses an operating method for a coil transfer device wherein support rollers of a winding and unwinding station are each disposed on moveable frame components that can be moved towards each other and tilted.
In the process, the metal coil, which usually weighs from around 10 to 40 t and is at a relatively high temperature of from around 900° C. to 1100° C., can sustain damage on its outer winding. Part of the outer perimeter then has to be scrapped.
One embodiment provides a method for transferring a metal coil, e.g., of a metal coil in a coil box, on a transfer path between a first coil position and a second coil position, wherein the metal coil is supported during the transfer on the transfer path in segments by means of support rollers, and wherein the metal coil is simultaneously unwound, wherein an unwinding cradle expanding in the direction of the transfer path is formed by changing the positions of support rollers disposed adjacent to each other, wherein the coil is supported by two support rollers disposed on a first frame part in the first coil position and is moved in the direction of the second coil position from said first coil position while said frame part is simultaneously tilted and lowered.
In a further embodiment, the first frame part is pivoted on a second frame part and the tilting and lowering movement is generated by a pivoting movement of the first frame part round an axis and a simultaneous pivoting movement of the second frame part around a different axis.
In a further embodiment, the metal coil is supported during the transfer in an alternating sequence by two or by three support rollers.
In a further embodiment, the two support rollers disposed on the first frame part are driven by means of a first actuator unit having the same rotational speed.
In a further embodiment, one support roller and a different support roller are each disposed on a swivel arm and are separately rotationally driven by an assigned actuator unit, wherein a velocity element that is derived from the pivoting movement round each assigned axis of the respective support roller is taken into account when setting the rotational speed.
In a further embodiment, the metal coil is supported in the unwinding position by means of an adjustable support roller.
Exemplary embodiments will be explained in more detail below based on the schematic drawings, wherein:
Embodiments of the present disclosure provide a method for transferring a metal coil which allows a careful transfer such that there is little scrap and which is, moreover, reliable.
According to some embodiments, the transfer of the metal coil is carried out on support rollers, the positioning whereof with respect to the transport plane is successively predetermined such that a roller bed recess continuing in the transfer direction is formed. The positioning of the respective support rollers is achieved by means of assigned part-turn actuators, such as, for example, a hydraulic cylinder. A sequence of movements that is similar to a “traveling wave” is generated and this moves the metal coil along with it in a “wave trough”. During the transfer procedure, the metal coil is alternately supported by two or by three support rollers. This involves the coil being supported in a first coil position by means of two support rollers disposed on a first frame part. The coil is moved out of this position as said frame part is simultaneously tipped and lowered. This allows a careful transfer to the subsequent roller bed in the transport direction. The active handover between support by two and support by three support rollers can be handled very carefully during this procedure by controlling the actuators accordingly. Thus only comparatively slight forces impact on the outer perimeter of the coil and there is less risk of damage.
A stable position of the metal coil is achieved if the coil is supported by two or by three support rollers during the transfer in an alternating sequence.
In order to avoid damaging the surface of the strip, the peripheral speed of each roller that is in contact with the strip may be equal to the speed of the strip.
Example embodiments are described in more detail hereafter by way of example with the aid of the sequence of a coil transfer procedure that is illustrated in
The view in
As long as the metal coil 4 is in the winding position 5 shown in
As is demonstrated hereafter, the disclosed method creates a strategy for a careful transfer of the metal coil in the coil box.
The coil transfer is achieved according to the disclosed method by a coordinated adjustment of the axes of adjacent support rollers 11, 12, 13, 14, whereby a “wave trough” is created, continuing in the transfer direction 8 and forming an unwinding cradle 32 for the coil 4 that is unwinding.
This process of successive adjustment of adjacent support rollers is explained hereafter in more detail with the aid of a chronological sequence:
The sequence starts with a position of the metal coil 4, in which said coil rests on two support rollers 11 and 12 (
In order to move the metal coil 4 out of said stable position into an unwinding position 6, the supporting frame 7 is tilted and simultaneously lowered. As can be seen from
For the further transfer, the first support roller 13 is now tilted downwards in the direction of the arrow 19 round the axis 27, as a result of which, due to gravity, the lateral movement of the metal coil 4 is again continued in
A further lowering of the first support roller 13 causes the metal coil 4 to continue its lateral movement in the direction of the unwinding position 6 once again. This is supported by a pivoting movement of the supporting frame 7 directed in a clockwise direction, the first frame part 29 being rotated round the axis 25 in the direction of the arrow 21. The unwinding cradle 32 has therefore moved further in the direction of the arrow 8, together with the metal coil 4 that is unrolling thereon. Now there are again three support rollers supporting the metal coil 4 (
In order to move the metal coil 4 out of this position and further in the direction of the unwinding position 6, the “wave trough” is moved further to the left. As shown in
Ultimately, in the final step, the first support roller 13 and the second support roller 14 are tilted upwards anti-clockwise, which results in the metal coil 4 being raised up. As soon as the second support roller 14 is at the height of the fixedly-mounted third support roller 15, the transfer of the metal coil 4 has been completed. The metal coil 4 is now located in the unwinding position 6. In this final movement segment, a roller 10 functions as a retaining roller or support roller and prevents the metal coil 4 from rolling too far in the direction of the driver due to the rigid arrangement of the support roller 15. In order for this final transfer step to be intercepted as gently as possible, the supporting or retaining roller 10 is positionally adjustable in a horizontal direction along the double arrow 9. By means of the adjusted roller 10, which unrolls along the perimeter of the coil 4, it is possible for the unwinding coil to be equipped with studs towards the end of the strip in order to prevent the final coil layers from being squeezed together. The fact that the roller 10 can be moved horizontally allows the eye of the strip 20 to be positioned before a stud moves into place.
The principle of the movement of an advancing floor recess may have the advantage that the metal coil is continually resting in a cradle, that is, in a stable position. The transfer of the metal coil 4 from support roller to support roller is able to ensue comparatively gently due to a corresponding adjustment of the support rollers.
As already mentioned, each of the rollers 11, 12, 13, 14 is rotatably driven, the peripheral speed being set such that there is no slippage between the speed of the strip 2 and the rotational movement of the roller. In order to come as close as possible to this objective, the linear velocity element resulting from the pivoting movement of the roller is taken into account when setting the rotational speed of the roller.
Number | Date | Country | Kind |
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10176982 | Sep 2010 | EP | regional |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP2011/064806 | 8/29/2011 | WO | 00 | 5/4/2013 |
Publishing Document | Publishing Date | Country | Kind |
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WO2012/034842 | 3/22/2012 | WO | A |
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20130214078 | Jesche et al. | Aug 2013 | A1 |
Number | Date | Country |
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1583308 | Feb 2005 | CN |
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19803091 | Jul 1999 | DE |
10034231 | Feb 1998 | JP |
2009103144 | Aug 2009 | WO |
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Entry |
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Korabi, Tarif et al., “New Developments Expand Coilbox Applications,” AISE Steel Technology, Iron and Steel Engineer, vol. 32, No. 12, 8 pages, Dec. 1, 1996. |
International Search Report and Written Opinion, Application No. PCT/EP2011/064806, 17 pages, Nov. 14, 2011. |
Number | Date | Country | |
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20130214078 A1 | Aug 2013 | US |