Patent Application
20220080485
The disclosure relates to a reversing reel with a rotor, on which at least one reel mandrel is provided with a rotary drive and arranged eccentrically with respect to an axis of rotation of the rotor, for winding a strip into a coil, having at least one driven mandrel support device comprising a mandrel support that has a bearing head for supporting the free end of the at least one reel mandrel.
The disclosure further relates to a method for winding strips, in particular metal strips, into a coil, in particular using the disclosed reversing reel.
In principle, reels are known in the prior art. These are used, for example, in both cold and hot strip rolling mills for winding the strip.
After rolling, for example, a rolled metal strip can be wound onto a reel mandrel or onto a winding sleeve fitted onto the reel mandrel and later unwound again. For the realization of shortest winding coil sequences, especially in so-called “continuous operation,” reversing reels that have at least two reel mandrels and in which the positions of the reel mandrels are changed during a reeling process are used. The reel mandrels are each driven and mounted on a rotor. At the start of a winding process, the rotor of the reel is turned such that a reel mandrel that is still empty is positioned in an initial-winding position. In such position, the strip is then wound on the reel mandrel. The term “initial winding” is usually understood to mean that one to three windings of the strip are initially wound onto the reel mandrel. After initial winding has taken place, a tensile stress (strip tension) is built up in the strip for further winding. During further winding, the reel mandrel is turned from the initial-winding position to a final-winding position. There, the final winding of the strip into a coil or a bundle, as the case may be, takes place. The coil can be removed from the final-winding position after completion and transported further.
In a reversing reel, the reel mandrels are mounted in a fixed manner on one side, that is, on one end on the drive side. However, when reeling a metal strip, it is important to support the reel mandrel on both sides and to have a symmetrical bending line of the reel mandrel as a result, in order to ensure stable strip running during reeling and to improve the winding accuracy of the strip on the reel mandrel.
From WO 2018/041673 A1, a support device for a reversing reel for reeling a metal strip is known, which comprises at least one support unit that can be brought into supporting contact with a free end section of a reel mandrel. The support unit is guided on a rail, which is arranged in front of the reel and which follows the circular path of the reel mandrel with its own drive. The guide rail in front of the reel obscures the area on the operating side in front of the reel. In addition, the complete execution is relatively heavy and costly.
From EP 1 886 951 A1, a winding machine is known for winding a web of material divided into strips by longitudinal cuts, in particular a paper web, plastic film or metal foil. The winding machine comprises two winding shafts extending across the width of the machine, which are mounted in a swiveling turning device on one side of the machine for movement from a winding position to an unloading position and back. On the side of the machine opposite to the turning device, there is a support device with a support element that can be moved vertically by means of a drive and whose end supports a winding shaft on its way from the initial-winding position to the unloading position. The support element is formed as a motor-driven extendable support, which is mounted as a swing arm in a swivel joint. The support element can thus be pivoted from a winding position to an unloading position, wherein the pivoting is effected by means of an actuator, such that the pivoting movement describes a circular path that corresponds to the circular path of the turning device. In the winding machine described in EP 1 886 951 A1, a winding process is not provided during the movement of the turning device under strip tension. Rather, it is intended to carry out the winding process into the initial-winding position and then to rotate the winding roll concerned to the unloading position.
Relatively high coil weights have to be handled, in particular when winding metal strips from rolling mills. The reel mandrel already has a very high dead weight. Therefore, its free end is already sagging opposite its rotor-side end when it is not wound with a metal strip. Under the load of the wound metal strip, the one-sided deformation increases. In addition, there is the effect of the strip tension of the metal strip wound up under tensile force. The sagging or drooping of the free end of the reel mandrel is particularly disadvantageous, because the winding accuracy of the strip is impaired. This winding inaccuracy also has a negative effect on the flatness of the strip.
The disclosure aims to improve a known reversing reel in such a manner that the deflection of the free end of the reel mandrel is reliably reduced during the entire winding process. The disclosure is further based on the object of providing a corresponding method.
The object is achieved by a device as claimed. The object is further achieved by a method as claimed.
A reel with a rotor is provided, on which at least one reel mandrel with a rotary drive for winding strip into a coil is arranged eccentrically with respect to an axis of rotation of the rotor. The reel has at least one driven mandrel support device, comprising a mandrel support, which has a bearing head for supporting a free end of the at least one reel mandrel. In accordance with a variable position of the reel mandrel the bearing head is movable with the reel mandrel when the reel mandrel is transferred from an initial-winding position into a final-winding position. The mandrel support is in the form of a first piston-cylinder arrangement and the mandrel support is supported in a pivotable manner via a mandrel-support bearing on a slide that is movable tangentially to a circular path of the reel mandrel. The inclination of the mandrel support and the position of the bearing head are adjustable such that the mandrel support is oriented in accordance with or parallel to a resultant force from weight force of the coil and tensile force on the strip.
The position of the bearing head is preferably radially adjustable with respect to the axis of rotation of the rotor.
The disclosure can be summarized as providing a mandrel support device having a mandrel-support bearing that is traveling along, which supports the free end of the reel mandrel in an initial-winding position and during transfer of the reel mandrel from the initial-winding position into the final-winding position. The bearing head of the mandrel support device can be in engagement with the free end of the reel mandrel both during initial winding and intermittently during final winding, in such a manner that in a relatively simple manner the mandrel support counteracts not only the increasing weight force but also the strip tension force. The mandrel-support bearing can be adjusted in such a manner that a setting can be selected for any combination of strip tension and coil weight, even during the winding process, which allows the reel mandrel to be supported accordingly. The mandrel support is adjusted during the operation of the reversing reel in such a manner that the deflection of the reel mandrel can be optimally influenced. Ideally, the reel mandrel is always supported, even during rotation, approximately in the direction of the resultant force from the strip tension and the weight force of the bundle or coil, as the case may be. This has the particular advantage that no tilting torques are transmitted into the system that would have to be additionally absorbed.
“Traveling along” means that the mandrel support follows the executed circular movement of the reel mandrel and the coil wound thereon during the rotation of the rotor.
Preferably, the reversing reel additionally comprises a stationary outer bearing, which is pivoted against the reel mandrel in the final-winding position. Both the bearing head of the mandrel support device and a correspondingly formed bearing head of a stationary outer bearing are formed such that they can each engage a different circumferential section of the reel mandrel along the same length of the reel mandrel. This makes it possible to engage the reel mandrel with the stationary outer bearing in the final-winding position and then move the mandrel support device back to the starting position.
The reversing reel preferably comprises two reel mandrels, each rotatably mounted on one side of the rotor, which are arranged diametrically opposite each other.
Preferably, the mandrel support can be adjusted in inclination by means of an adjusting device fastened on the slide. In combination with the mandrel support, which can be adjusted in inclination and length, an inclination adjustment can be achieved particularly easily via the slide by superimposing a rotational movement and a linear movement.
Preferably, a second piston-cylinder arrangement is provided as the adjusting device for adjusting the inclination of the mandrel support. Both the first and the second piston-cylinder arrangements are preferably formed as hydraulic cylinders, whose force can be controlled relatively easily and finely. Both piston-cylinder arrangements can be equipped with sensors for force measurement and with sensors for path recording.
Alternatively, the inclination adjustment for the mandrel support can be accomplished by means of a hydraulic or electric rotary drive.
Preferably, the slide can be displaced tangentially to the axis of rotation of the rotor via a third piston-cylinder arrangement.
In the case of a level set-up of the reversing reel, the slide can be moved or displaced, as the case may be, horizontally with respect to the set-up plane. Alternatively, the slide can be adjusted on a toothed rack by means of a toothed drive, for example.
A control system is expediently provided for controlling the mandrel support device in such a manner that the mandrel support follows a circular path of the mandrel over at least a partial circular section during the winding process.
The object underlying the disclosure is further achieved by a method for winding strips, in particular metal strips into a coil or bundle, by means of a reversing reel with a rotor, on which at least one reel mandrel, provided with a rotary drive, for winding strip is arranged eccentrically with respect to an axis of rotation of the rotor, having at least one driven mandrel support device, comprising a mandrel support that has a bearing head for supporting a free end of the at least one reel mandrel, wherein the method has the following steps: Rotating the rotor to transfer the initially empty reel mandrel to an initial-winding position, supporting a free end of the reel mandrel with the bearing head of the mandrel support, lifting the free end of the reel mandrel with the mandrel support, initial-winding the strip in the initial-winding position, rotating the rotor to transfer the reel mandrel with the wound-on coil into a final-winding position, wherein the mandrel support is tracked during rotation of the rotor from the initial-winding position into the final-winding position in such a manner that the bearing head remains in load-bearing engagement with the free end of the mandrel support, supporting the reel mandrel by means of a stationary outer bearing and final winding of the strip. An adjustment of the inclination of the mandrel support before and/or during the initial winding and/or during the transfer of the reel mandrel into the final-winding position is effected in such a manner that the angle between the mandrel support and a perpendicular corresponds to the angle between a resultant force from a strip tensile force and weight force of the coil.
It is expedient to adjust the inclination of the mandrel support during the rotation of the rotor from the initial-winding position into the final-winding position.
Preferably, the tracking movement of the mandrel support is performed at least partially by superimposing a linear movement of the mandrel support device with a pivoting movement of the mandrel support. If the first, second and third piston-cylinder arrangements of the reversing reel are each provided with displacement sensors, the cylinders can be controlled in such a manner that they follow the circular path of the reel mandrel.
In an advantageous variant of the method, it is provided that the free end of the reel mandrel is supported as a function of the weight force of the coil and/or the strip tension. In this case, the load support of the mandrel support can be measured in engagement with the free end of the reel mandrel, wherein the support force of the mandrel support is controlled to compensate for its lowering caused by weight force and strip tension. For this purpose, the first piston-cylinder arrangement is preferably force-controlled such that the free end of the reel mandrel is always lifted with the optimum supporting force.
The inclination of the first piston-cylinder arrangement can be recorded by means of displacement measurement in the cylinder or direct angle measurement.
The closed-loop control system of the inclination adjustment of the first piston-cylinder arrangement can take place as a function of a force acting at an angle with respect to the supporting force of the mandrel support. If the mandrel support is loaded only in its longitudinal direction, no transverse force and therefore no torque acts on the mandrel support. The closed-loop control system can provide that the inclination of the mandrel support is adjusted in such a manner that the force acting on it at an angle to the support direction is minimal.
According to a variant of the closed-loop control of position and inclination of the mandrel support, it can be provided to provide a pure position control.
Alternatively, the closed-loop control of the position and inclination of the mandrel support can take place predominantly as force control.
Regardless of whether the closed-loop control is force control or position control, the target inclination and the target position of the mandrel support can be specified by a rotary encoder on the rotor. The closed-loop controls can alternatively take place as a function of the location of the reel mandrel.
With a variant of the method, it is provided that the supporting force acting on the mandrel support is used as an input variable of an actuator in a control loop.
In addition, the support force acting on the mandrel support can be used as an input variable of an actuator in a control loop, which serves to control the flatness of the strip.
The invention is described below with reference to the accompanying drawings. The drawings show the following:
The reversing reel 1 comprises a mandrel support device 4 with a mandrel support 5, at the free end of which is a bearing head 6 formed in a fork shape. The mandrel support 5 is part of a first piston-cylinder arrangement 7, which can be adjusted longitudinally by hydraulics. In the position of the rotor 2 shown, the lower reel mandrel 3 is in the initial-winding position A and the upper reel mandrel 3 is shown in the final-winding position F. The reel mandrel 3 located in the initial-winding position A is empty. Furthermore, the drawing shows the supported position of the reel mandrel 3′ in operation as an intermediate position Z from an initial-winding position A into the final-winding position F. The coil 8′ shown in the intermediate position Z is already wound on. The reel mandrel 3, which is in the final-winding position F, is loaded with a final-wound coil 8, wherein the coil 8 in the final-winding position F is indicated as a dashed line. The intermediate position Z shows an arbitrary position of the reel mandrel 3 with an arbitrarily wound strip 9 during its transfer from the initial-winding position A into the final-winding position F. The intermediate position Z is not a discrete position of the rotor 2.
The mandrel support 5 is adjustable in its inclination by means of a second piston-cylinder arrangement 10. The mandrel support 5 is mounted via a mandrel-support bearing 11 on a slide 13 that can be moved horizontally and on a flat support 12. The slide 13 is in turn driven or movable, as the case may be, by means of a third piston-cylinder arrangement 14. By means of a superimposed movement of the slide 13, which is movable tangentially to the axis of rotation D of the rotor 2, and the angular adjustment of the mandrel support 5, which is effected via the second piston-cylinder arrangement 10, which mandrel support is in turn formed as a first piston-cylinder arrangement 7 adjustable in length, the bearing head 6 of the mandrel support 5 in engagement with the reel mandrel 3 in operation can follow the circular path of the reel mandrel mounted eccentrically on the rotor 2 from the initial-winding position A via the intermediate position Z into the final-winding position F, wherein, as already noted above, the intermediate position Z is only drawn for reasons of clarity. This intermediate position Z is not a discrete position of the rotor 2.
In the initial-winding position A, the reel mandrel 3 is initially raised, then the strip 9 is wound onto the reel mandrel 3. After about one to three windings, the rotary motion of the rotor 2 is started. The rotor 2 rotates the reel mandrel 3 when it is in operation, while it continues to wind the strip 9 into the final-winding position F. In the final-winding position F, a stationary outer bearing is pivoted against the reel mandrel 3, such that it engages under the reel mandrel 3. The stationary outer bearing is not shown in the drawings. The bearing head 6 of the mandrel support 5 is formed in a fork shape and engages under the reel mandrel only on a partial circle section of its circumference. A bearing head of the stationary outer bearing is formed accordingly and also engages under the reel mandrel 3 only on a partial circle circumference, in such a manner that, initially in the final-winding position F, the reel mandrel 3 is engaged under on the same length section both by the bearing head of the stationary outer bearing and by the bearing head 6 of the mandrel support 5. As soon as the reel mandrel is supported on the stationary outer bearing, the bearing head 6 of the mandrel support 5 is disengaged from the reel mandrel 3, such that the mandrel support device can be returned to its starting position.
The first, second and third piston-cylinder arrangements 7, 10 and 13 are each provided with force and/or displacement sensors. Alternatively or additionally, the first piston-cylinder arrangement 7 can be provided with an angle sensor/inclinometer/inclination sensor.
The mandrel support 5, which is already brought into engagement with the free end of the reel mandrel 3 in the initial-winding position A, is provided to travel along with or follow, as the case may be, the rotor 2 in support of the reel mandrel 3 in operation with a corresponding rotation of the rotor 2. Initially, the mandrel support 5 already raises the empty reel mandrel 3 into the initial-winding position A, in such a manner that compensation is provided for any undesirable deflection or bending, as the case may be.
Different variants are possible for controlling the position and inclination of the mandrel support 5.
For example, the inclination and position of the mandrel support 5 are specified as target values by a rotary encoder on the rotor 2, which is not shown. Alternatively, it is possible to specify the target inclination and the target position of the mandrel support 5 as a function of the position of the reel mandrel 3 in operation. Alternatively or additionally, the target inclination and the target position of the mandrel support 5 can be specified by a flatness measurement of the strip 9.
Via a control system the mandrel support 5 is driven into the corresponding target position and target inclination. The angle of inclination of the mandrel support 5 can be recorded, for example, via a displacement measurement in the cylinder of the first piston-cylinder arrangement 7 or via an angle measuring device.
Pure position control can be provided for the first, second and third piston-cylinder arrangements 7, 10, 14. The forces of all cylinders can be recorded by means of force sensors and compared with the forces that are calculated or predetermined, as the case may be. Alternatively, it is possible to adjust the first and second piston-cylinder arrangements 7, 10 by force control, whereas the third piston-cylinder arrangement 14 is moved by path-dependent closed-loop control.
The circular path of the reel mandrels 3, which they complete with the rotor 2, on which they are mounted eccentrically with respect to the axis of rotation D, is marked with the letter K. The inclination of the mandrel support 5 is adjusted during the operation of the supported holding mandrel 3, such that the angle between the relevant mandrel support 3 and a perpendicular corresponds as far as possible to the angle between a resultant force R from a strip tensile force BZ and the weight force G of the coil 8, 8′. A graphical force decomposition of the resultant force R from the strip tensile force BZ and the weight force G of the coil 8, 8′ is shown in
With the method in accordance with the disclosure, as already mentioned at the beginning, the reel mandrel 3 to be loaded is first brought into the initial-winding position A. In such initial-winding position A, the free end of the reel mandrel 3 is supported or gripped, as the case may be, by the correspondingly moved mandrel support 5 with the bearing head 6 formed in the shape of a fork. The mandrel support 6 then raises the reel mandrel 3 to a position in which bending or deflection, as the case may be, of the reel mandrel 3 is largely counteracted. In the initial-winding position A, two to three windings of the strip 9 are initially wound onto the reel mandrel 3. Then, the rotor 2 of the reversing reel 1 is turned counterclockwise in accordance with the representation in
The force control of the mandrel support 5 can, for example, be carried out in such a manner that the support force S is determined via the cylinder pressure of the first piston-cylinder arrangement. All cylinders or piston-cylinder arrangements 7, 10, and 13, as the case may be, are provided with path sensors with which the position and inclination of the mandrel support can be reliably recorded.
1 Reversing reel
2 Rotor
3, 3′ Reel mandrels
4 Mandrel support device
5 Mandrel support
6 Bearing head
7 First piston-cylinder arrangement
8, 8′ Coil
9 Strip
10 Second piston-cylinder arrangement
11 Mandrel-support bearing
12 Support
13 Slides
14 Third piston-cylinder arrangement
15 Actuator
16 Controller
17 Position sensor
18 Stand
19 Flatness measurement
20 Flatness controller
A Initial-winding position
F Final-winding position
Z Intermediate position
BZ Strip tensile force
G Weight force of the coil
D Rotational axis of the rotor
K Circular path of reel mandrels
S Support force
α Angle
β Angle
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2019 200 594.2 | Jan 2019 | DE | national |
| 10 2019 206 951.7 | May 2019 | DE | national |
This application is a national stage application, filed under 35 U.S.C. § 371, of International Patent Application No. PCT/EP2020/050672, filed on 13 Jan. 2020, which claims the benefit of German Patent Applications No. 10 2019 200 594.2, filed 17 Jan. 2019 and No. 10 2019 206 951.7 filed 14 May 2019.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/050672 | 1/13/2020 | WO | 00 |
