REEL FOR WINDING OR UNWINDING STRIP-SHAPED MATERIAL AND METHOD

Abstract

The invention relates to a reel (10) for winding or unwinding strip-shaped material, in particular a metal strip or the like, and to a method for tensioning a coil (12), the reel comprising a frame (13), at least one reel head (14) for disposing the coil for winding or unwinding material (11), a drive arrangement (15) having at least one electric motor (16) and a shaft (20) which connects the electric motor to the reel head, the electric motor being formed comprising a stator (17) and a rotor (18) and being disposed on the frame, the electric motor being a torque motor or a synchronous motor, the shaft directly connecting the rotor to the reel head, the rotor being mounted on the stator so as to be axially displaceable relative to the stator.

Claims

1. A reel for winding or unwinding a strip-shaped material, in particular a metal strip or the like, the reel comprising: a frame, at least one reel head for disposing a coil for winding or unwinding material, a drive arrangement having at least one electric motor, and a shaft that connects an electric motor to the reel head, the electric motor comprising a stator and a rotor and disposed on the frame, wherein: the electric motor is a torque motor or a synchronous motor, the shaft connects the rotor directly to the reel head, the rotor being mounted on the stator so as to be axially displaceable relative to the stator, and wherein the stator is formed from a coil package having a plurality of coils and surrounds the rotor, the rotor is formed from a ring package having a plurality of rings, each ring having magnets on a circumference thereof, the rings being connected to each other, a length (L.sub.R) of the ring package being smaller than a length (L.sub.W) of the coil package relative to a longitudinal axis of the shaft, and wherein a displacement range (V) of the rotor corresponds to a difference of the lengths (L.sub.W, L.sub.R).

2. (canceled)

3. The reel according to claim 1, wherein the drive arrangement comprises at least one electric motor, each of the at least one electric motor comprising the frame and a reel head of the at least one reel head, a coil disposed between reel heads of the at least one reel head, a respective coil packages of the at least one electric motor having a corresponding length (L.sub.W).

4. The reel according to claim 3, wherein when the at least one electric motor includes multiple electric motors, respective powers of the multiple electric motors differ from one another.

5. The reel according to claim 4, wherein lengths (L.sub.R) of ring packages respectively corresponding to the multiple electric motors are different.

6. The reel according to claim 1, wherein the rings differ from each other in width or are identical in width.

7. The reel according to claim 1, wherein the drive arrangement comprises a tensioning device having an actuator that is configured to axially displace the rotor relative to the stator.

8. The reel according to claim 7, wherein the rotor is disposed on the shaft and mounted on a housing of the stator by means of radial bearings and at least one axial bearing, wherein a longitudinal guide is formed between each of present bearings and the housing of the stator on either side of the rotor relative to a longitudinal axis of the shaft.

9. The reel according to claim 7, wherein the drive arrangement comprises an additional actuator configured to axially displace the electric motor on an additional longitudinal guide relative to the frame with respect to a longitudinal axis of the shaft, the additional longitudinal guide being formed on the frame.

10. The reel according to claim 1, wherein the at least one electric motor has a housing attached to the frame, and wherein at least one force transducer of a sensing device of a control device of the reel is disposed between the housing and the frame.

11. The reel according to claim 1, wherein the drive arrangement has two reel heads, each reel head of said two reel heads being formed so as to have an expansion head or a cone dimensioned to receive the coil.

12. The reel according to claim 11, wherein the expansion head has an expansion-segment arrangement that includes expansion segments and that is configured to radially tension the coil, and further comprising at least one hydraulic line or a drawbar configured to actuate the expansion segments and disposed within the shaft.

13. A modular system for forming a reel according to claim 1, the modular system comprising a stator formed by a coil package having a plurality of coils and a plurality of rings, each having magnets on a circumference thereof or in insertion pockets directly below the circumference of such ring, which serve to form a ring package of a rotor, the rings being selected from a first set of rings having a first width and from a second set of rings having a second width that is different from the first width.

14. A method for tensioning a coil for winding or unwinding a strip-shaped material with the use of a reel, the method comprising: with a tensioning device of a drive arrangement of the reel, axially displacing a rotor of at least one electric motor of the drive arrangement relative to a stator of said at least one electric motor, and by said axially displacing, tensioning or releasing a coil disposed between reel heads of the drive arrangement, wherein the at least one electric motor is a torque motor or a synchronous motor.

15. The method according to claim 14, further comprising by said axially displacing, effectuating a strip center control and/or a strip center alignment before or during a rolling operation.

16. A reel for winding or unwinding a strip-shaped material, the reel comprising: a frame, at least one reel head for disposing a coil for winding or unwinding material, a drive arrangement having at least one electric motor, and a shaft that connects an electric motor to the reel head, the electric motor comprising a stator and a rotor and disposed on the frame, wherein the electric motor is a torque motor or a synchronous motor, the shaft connects the rotor directly to the reel head, the rotor being mounted on the stator so as to be axially displaceable relative to the stator, wherein the at least one electric motor has a housing attached to the frame, and wherein at least one force transducer of a sensing device of a control device of the reel is disposed between the housing and the frame.

17. The reel according to claim 16, wherein the drive arrangement has two reel heads, each reel head of said two reel heads being formed so as to have an expansion head or a cone dimensioned to receive the coil.

18. The reel according to claim 17, wherein the expansion head has an expansion-segment arrangement that includes expansion segments and that is configured to radially tension the coil, and further comprising at least one hydraulic line or a drawbar configured to actuate the expansion segments and disposed within the shaft.

19. The reel according to claim 16, wherein the drive arrangement comprises a tensioning device having an actuator that is configured to axially displace the rotor relative to the stator.

20. The reel according to claim 19, wherein the rotor is disposed on the shaft and mounted on a housing of the stator by means of radial bearings and at least one axial bearing, wherein a longitudinal guide is formed between each of present bearings and the housing of the stator on either side of the rotor relative to a longitudinal axis of the shaft.

21. The reel according to claim 19, wherein the drive arrangement comprises an additional actuator configured to axially displace the electric motor on an additional longitudinal guide relative to the frame with respect to a longitudinal axis of the shaft, the additional longitudinal guide being formed on the frame.

Description

[0034] In the following, a preferred embodiment of the reel is explained in more detail with reference to the drawings.

[0035] FIG. 1 shows a first embodiment of a reel in a longitudinal sectional view;

[0036] FIG. 2 shows a second embodiment of a reel in a longitudinal sectional view;

[0037] FIG. 3 shows a third embodiment of a reel in a longitudinal sectional view;

[0038] FIG. 4 shows a fourth embodiment of a reel in a longitudinal sectional view.

[0039] FIG. 1 shows a reel 10 for winding strip-shaped material 11 or a metal strip on a coil 12. The reel 10 comprises two essentially correspondingly designed frames 13, two correspondingly designed reel heads 14 for disposing the coil 12 and a drive arrangement 15, which comprises two correspondingly designed electric motors 16 or torque motors. Each of the electric motors 16 is formed by a stator 17 and a rotor 18, the stator 17 surrounding the rotor 18 and the rotor 18 being rotatably mounted within the stator 17. A rotor carrier 19 of the rotor 18 is non-rotatably disposed directly on a shaft 20 of the electric motor 16, the shaft 20 being directly connected to the reel head 14. Furthermore, the rotor 18 is formed from a ring package 21 consisting of a plurality of rings (not shown), each having magnets at a circumference 22 of the respective ring. These rings are detachably connected to each other. The stator 17 is formed by a coil package 23 having a plurality of coils (not shown), which are surrounded by a frame (not shown). Cooling channels 24 are formed within this frame, through which a cooling medium (not shown) flows and which serve to cool the coil package 23. Passive cooling or surface cooling of the frame is also possible.

[0040] The electric motor 16 is further formed having a housing 25, which surrounds the rotor 18 and the stator 17. The housing 25 is firmly connected or screwed to the frame 13 at fastening points 26. The frame 13 is firmly connected to a foundation 28 at fastening points 27. Furthermore, the housing 25 is formed having a longitudinal guide 29 that allows axial displacement of the rotor 18 relative to the stator along a longitudinal axis 30 of the shaft 20. The longitudinal guide 29 is formed by sleeves 31 and 32, which are disposed on either side of the rotor 18, and bushings 33 and 34 surrounding the sleeves 31 and 32, respectively. The shaft 20 is mounted radially and axially within the sleeves 31 and 32 by means of rolling bearings 35. A displacement of the rotor 18 relative to the stator is possible within a displacement range V, the displacement range V resulting from a difference of a length L.sub.R of the ring package 21 and a length L.sub.W of the coil package 23. A possible displacement takes place by means of an actuator 36, which is formed by a hydraulic cylinder 37 in this case and which is coupled to the bushing 33 via a brace 38. The possibility of displacing the rotor 18 or the shaft 20 with the reel head 14 thus forms a tensioning device 39 for tensioning the coil 12 between the reel heads 14.

[0041] In particular, directly driving the coil 12 by the electric motors 16 makes it possible to significantly reduce the number of rotating parts of the reel 10 and to not require additional drive shafts, couplings or the like.

[0042] A mechanical brake as a service brake on the reel is also not required since the electric motors 16 can be braked by a short circuit of the coils via a resistor in the event of a power failure or a converter fault. Furthermore, a standstill brake is also not required since a short circuit of the coils can be used to hold the rotor in its position when it is at a standstill. By reducing the number of parts or modules of the reel 10, maintenance costs can be significantly reduced.

[0043] Furthermore, it is possible to adjust or increase the power of the electric motors 16 by adding rings even after the reel 10 has already been put into operation.

[0044] Drive arrangement 15 comprises an additional actuator 40, which is disposed on the frame 13 and formed by an additional hydraulic cylinder 41. The housing 25 is mounted on an additional longitudinal guide 42, which is formed on the frame 13, and is also axially displaceable in the longitudinal direction of the longitudinal axis by means of the additional actuator 40.

[0045] The reel heads 14 are each designed as an expansion head 43, which has expansion segments (not shown) which can be actuated via a hydraulic line (not shown). The expansion segments can exert a clamping force on an inner side 44 of the coil 12 so that the coil 12 is centered and non-rotatably clamped on the respective expansion heads 43. The coil 12 having the material 11 can be transported to the reel 10 by means of a carriage 45, which can be moved on rails 46 transversely to the longitudinal axis 30.

[0046] Furthermore, force transducers 47 are disposed on the housing 25 or the fastening points 26 between the housing 25 and the frame 13. The force transducers 47 are a component of a control device (not shown). The control device serves to regulate a strip tension or a strip tension force of the reel 10 or a power and thus a torque of the electric motors 16. The control device comprises a regulating device for regulating the strip tension or the electric motors 16 and a sensing device, which comprises the force transducers 47. By placing the force transducers 47 between the frame 13 and the housing 25, it is possible to determine the forces acting between the frame 13 and the housing 25. Since the electric motors 16 are each directly connected to the coil 12 via the shaft 20 and the reel head 14, a torque of the respective electric motors 16 can be determined directly and thus particularly precisely via the force transducers 47 or the sensing device, which allows for improved control of the strip tension.

[0047] FIG. 2 shows a reel 48 in which, in contrast to the reel in FIG. 1, a frame 49 is formed without an additional longitudinal guide. In this case, the tensioning device 39 suffices for tensioning a coil 50.

[0048] FIG. 3 shows a reel 51 on which, in contrast to the reel in FIG. 2, reel heads 52 are provided which form a cone 53 for receiving a coil 54. The coil 54 is formed having an inner cone 56 at its respective ends 55. In this way, the coil 54 can be accommodated on the reel 48 so as to be centered and non-rotatable in a force-fitting manner by clamping it between the reel heads 52.

[0049] FIG. 4 shows a reel 57 in which, in contrast to the reel in FIG. 1, only a frame 13 and an electric motor 16 are provided. Instead of an additional electric motor, a counter bearing 58 is provided here. Attached to the shaft 20 of the electric motor 16 is a separating drum 59 for receiving a coil 60 or a coil that has undergone a hot rolling process. In the case of a coil that has undergone a hot rolling process, the material 11 is disposed directly and without the coil 60 on the separating drum 59.