EP2109510B1 - Method and apparatus for winding up metal strips onto a winding mandrel - Google Patents

Description

The invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 6 for winding metal bands on a winding mandrel arranged in a winding mandrel to which the metal strip is fed from a driver having a lower and upper driver role, wherein for guidance a table is provided below the metal strip and above the metal strip, a pivotable band switch and this are arranged close to the winding mandrel then a pivotable shaft flap. Such a method and such a device are known from WO 03/004963 A1 known.

A through the DE 195 20 709 A1 Known driver has a stationary mounted lower roller and an engageable against this upper roller.
The engagable upper roller is mounted in an adjustable by means of pressure medium cylinder pivot frame, which is formed of two opposing wings, which are connected in the region of their common pivot axis by a mounted on both sides in the driver frame base. The wings of this driver can be adjusted by pressure medium cylinders which can be acted upon separately, with the base interconnecting the wings being designed as a torsion spring.

It can be achieved by introducing different Anstellkräfte at relatively low differential force of the pressure medium cylinder different swing angle of the wings and thus the adjuster upper roller. Because by pivoting the upper roller, the force exerted by the driver pulling force can be influenced on the band and set in this way a train distribution.

From the DE 197 04 447 A1 For example, a measuring roll for measuring the flatness of a tensioned rolled strip in a hot strip mill is known.

One or more of these metering rollers, which are pressed against the rolled strip from below, may be between the rolling mills of the finishing train and / or in the rolling direction behind the last stand of the finishing train and / or before a capstan and / or between the capstan and the capstan to be ordered. In a measuring roller arranged between the blowing apparatus and the reel, the obtained measured value can be used to pivot the blowing apparatus and in this way the band run can be regulated during winding onto the reel mandrel.

By the DE 199 53 524 A1 For example, a loop lifter has become known which can measure a wedging which is present over the bandwidth due to the longitudinal tension prevailing in a metal band. For this purpose, the loop lifter has a looper roll mounted on both sides in a respective pivoting arm. The pivot arms are each divided by a joint in a shaft arm and a roller arm and connected to a Schliegerheberwelle. The joint deflects a restoring force exerted by the metal band on the looper roll applied from below against the metal band on force gauges arranged on the pivot arms. The restoring force corresponds to the longitudinal tension, so that it can be determined from the measured restoring forces. In order to prevent lifting of the roller arm of the dynamometer, the shaft arm and the roller arm are connected to each other via a holding element. Either due to the total longitudinal tension or the determined wedge ratio, for example, the runout and inlet directions designed as rolling mills or drivers can be readjusted, such as the rotational speed or the setting of the rolls.

The invention has for its object to provide a method and an apparatus of the type mentioned in such a way that an improved tensile measurement of a metal strip in the reel shaft can be achieved, which is intended to regulate the blowing apparatus or driver with such an influence on the tape, that a straight edge metal collar can be achieved.

This object is achieved with a method according to the invention in that the force exerted by the driver on the metal strip Längszugkraft for controlling the tape run by the driver by means of a reel shaft from above immersed in the metal strip Bandzugmesseinrichtung and the measurement signal is fed to a driver control. By pivoting the strip tension measuring device according to the invention from the top onto the metal strip, an optimum wrap angle can be maintained even at the end of the strip, in particular. This would not be possible with a pivoting of the strip tension measuring device from below, since in this case the wrap angle is severely limited by the required above the metal strip band switch including shaft flap and so small that no reliable measurement is possible at the end of the tape. However, the measurement at the end of the tape is just important because here the tape guide is particularly difficult due to the no longer present strip tension of the finishing scale of the rolling mill.

According to the invention, it is proposed that the wedging of the tension distribution determined by the strip tension measuring device immersed in the metal strip with a wrap angle in the metal strip is determined from the measured bearing forces of a bearing of the strip tension measuring device.

For this purpose, according to a preferred embodiment of the invention for direct or indirect bearing force measurement, a looping angle generated by a roll of the strip tension measuring device dipping into the metal strip can be used. The wrapping angle ensures the transmission of force from the metal strip to the roll and from there to the dynamometer integrated in the strip tension measuring device.

To actuate the Bandzugmesseinrichtung at least one cylinder is required, according to a proposal of the invention an attacking on a rear-side swivel arm swivel cylinder with stroke control. Alternatively, it may be two swing cylinders. Another way to operate the Bandzugmesseinrichtung is to provide the Bandzugmesseinrichtung in a U-shaped frame, which is engaged by a cylinder in the axis of symmetry of the frame.

It is recommended that the wrap angle is kept approximately constant by controlling the immersion depth of the roll. The wrap angle depends on the stroke of the swivel cylinder or the swivel cylinder and on the diameter of the wound coils. In order to maintain an optimal looping throughout the winding process, the stroke of the at least one pivoting cylinder can be controlled. The setpoint can be calculated during the winding process depending on the current coil diameter, the optimal looping and the geometric data. To record the stroke can be in the swing cylinder a odometer on or grow on the cylinder; Optionally, the swing-in tension measuring device can be equipped with an angle measurement, so that the stroke of the swing cylinder can be calculated. The instantaneous diameter of the coil can be determined from the counted revolutions of the winding mandrel and the thickness of the metal strip. Alternatively, a direct measurement of the coil diameter, e.g. with a laser-optical measuring device.

According to a further advantageous embodiment of the invention, the role of the strip tension measuring device is vorbeschleunigt before swinging on the speed of the metal strip. Since the roller is pivoted onto the belt during the winding process, pre-accelerating prevents damage to the metal strip due to a later-required acceleration process. The drive of the roller can be done mechanically and / or electrically and / or hydraulically.

An apparatus for solving the problem underlying the invention, in particular for carrying out the method, according to the invention is characterized in that the band-wedge formed as pivotable from above into the metal band Bandzugmesseinrichtung and with a switch body is provided, which has a rotatably mounted, at its front end a roller-bearing roller arm, wherein between the switch body and the roller arm, a force-measuring means is arranged, which is technically connected to a control device of the driver. The strip tension measuring device according to the invention thus simultaneously fulfills the classic band softening function. From the non-operating position, ie the lifted standby position, the entire Bandzugmesseinrichtung pivots counterclockwise downwards into the operating position immersed in the incoming metal strip and leads at the same time activated measurement the metal strip to the subsequent winding mandrel.

The function of the strip tension measuring device as a simultaneous band-pass filter is preferably supported by the fact that at least one front section of the table following the lower roller of the driver below the metal band is designed as a pivoting table. This is pivotable counterclockwise about the axis of the lower drive roller.

According to an advantageous embodiment of the invention, the switch body connects a rear-side pivot arm with a front-side pivot arm of the strip tension measuring device. With only one swivel cylinder, which would be mounted on the rear side and thus on the drive side, the switch body takes on the torsion load as a connection between the swivel arm on the drive side with the swivel arm on the operating side, by a single-sided operation of the belt tension measuring device by only one rear or drive side swivel cylinder would arise.

If a driven turnout roller is advantageously arranged in the axis of rotation of the strip tension measuring device that receives the drivably mounted roller, the metal strap can be protected from damage when it is guided on the way from the lower roller of the driver to the next roller of the subsequent coiler shaft ,

A variant of the invention provides that the strip tension measuring device is arranged with the roller arm to the mandrel pointing integrated into the upper shaft flap. In this arrangement, there is a combination of Bandzugmesseinrichtung and manhole cover. The front roller of the strip tension measuring device would connect to a reaching to the first pressure roller of the winding mandrel shaft flap and the free space to the upper roller of the driver would be filled with a conventional switch.

Fig. 1

in einer schematischen Darstellung eine Seitenansicht eines konventionellen, zum Stand der Technik zählenden Haspelschachtes;

Fg. 2

in einer schematischen Darstellung eine Seitenansicht eines Haspelschachtes mit einer von oben in das Metallband einschwenkbaren, gleichzeitig eine Bandweichenfunktion erfüllenden Bandzugmesseinrichtung, die sich in der von dem Metallband abgehobenen Außerbetriebsposition befindet;

Fig. 3

den Gegenstand der Fig. 2 mit der in die Mess- bzw. Betriebsposition eingeschwenkten Bandzugmesseinrichtung, kurz vor dem Ende eines Aufwickelvorgangs; und

Fig. 4

als Einzelheit einen Querschnitt durch eine in der Bandzugmesseinrichtung gelagerte Weichenrolle.

Further features and details of the invention will become apparent from the claims and the following description of an embodiment of the invention shown in the drawings. Show it:

Fig. 1

in a schematic representation of a side view of a conventional, counting to the prior art reel shaft;

Fig. 2

in a schematic representation of a side view of a reel shaft with a swing-in from above into the metal band, while a band softening function fulfilling Bandzugmesseinrichtung located in the lifted off the metal band off-mode position;

Fig. 3

the object of Fig. 2 with the tension measuring device pivoted into the measuring or operating position, shortly before the end of a winding process; and

Fig. 4

as a detail, a cross section through a mounted in the Bandzugmesseinrichtung points role.

A reel shaft 1, as in Fig. 1 shown in conventional design, a rolling mill or finishing scale for winding up the rolled metal strip 2 on a winding mandrel 3 to a collar or coil 4 closes (see. Fig. 3 ) at. The metal strip 2 is fed to the winding mandrel 3 by a blowing apparatus or driver, of which only the upper and lower drive rollers 5, 6 are shown. From the lower drive roller 6 is followed by the winding mandrel 3 below the metal strip 2, a table 7 at. The beginning or the tip of the thus-fed metal strip 2 is received by a first, the winding mandrel 3 associated pressure roller 8, the distributed distributed over the circumference further such roles.

Above the metal strip 2 is a band switch 9, which rests in the waiting position for tape recording on the upper drive roller 5. The band switch 9 is pivoted by a cylinder 10 which engages with its piston rod to a pivot arm of the band switch 9. The reel shaft 1 is closed at the top by a guided from the band switch 9 to the winding mandrel 3 shaft flap 11. For pivoting the shaft flap 11, a cylinder 12 is articulated to this.

In the in the Fig. 2 and 3 illustrated embodiment of the reel shaft 1, the matching with the above reel shaft components are provided with the same reference numerals. The main difference here is a strip tension measuring device 13 which at the same time fulfills the band softening function. This consists of a rear or drive side pivot arm 14 and a front-side pivot arm 14, of which in Fig. 2 the rear / drive side pivot arm can be seen. The two pivot arms 14 are by a torsion load receiving turnout body 15 (see. Fig. 4 ) connected with each other. In addition, it has a roller arm 16, in whose front end a driven roller 17 is mounted. The roller arm 16 is rotatably supported by a hinge 18. In order to avoid tilting due to gravity, the roller arm 16 is held in position by a retaining element 19.

Once the Bandzugmesseinrichtung 13 pivots from above into the metal strip 2 and in this with its role 17 to form a wrap angle immersed, a force is applied via the roller 17, which acts on the roller arm 16 in a clockwise direction. The rotation of the roller arm clockwise, however, is prevented by a dynamometer 20, which rather provides for a support of the roller arm 16, determines a force generated in the force axis 21 of the support force and as a measurement signal to a control device 22 (see. Fig. 3 ) of the driver. This can be controlled as a result of the measurement, for example, by pivoting the upper and / or lower drive roller 5, 6 or parallel pivoting both roles or by specifying different closing forces on the drive and operating side that arise on the winding mandrel 3 a straight edge coil 4 can.

The strip tension measuring device 13 is formed at its rear end in the tape running direction, away from the roller 17 with a provided in its axis of rotation switch point 23, as in the Fig. 2 and 3 shown as a cross section in the region of the pivot arm 7 through the pin of the switch roller 23. Again, the reel shaft 1 is closed at the top by a pivotable by means of the cylinder 12 shaft flap 11. The below the metal strip 2 from the lower drive roller 6 to the mandrel 3 extending, the metal strip 2 conductive table 7 is formed at least at its front end with a pivotable about the axis of the lower drive roller 6 counterclockwise pivoting table 24.

Of the Fig. 3 , which shows the operating position shortly before the end of a reeling operation for winding the metal strip 2 to a finished coil 4, on the one hand can clearly see the wrap angle that forms the metal strip 2 due to the dipping roller 17 of the strip tension measuring device 13. On the other hand, different measured signals 25 or control signals 26 are indicated by dashed lines, which enter the control device 22 or depart from it to pivot means of the upper and lower drive rollers 5, 6 (see the dashed lines 26). The parameters which are essential for determining and, if necessary, maintaining an optimum wrap angle during the entire winding process are determined, for example, by detection the stroke of the swivel cylinder or the swivel cylinder 10 of the strip tension measuring device 13, wherein the / the cylinder are equipped with a displacement meter, determined by an angle measurement of the strip tension measuring device 13 and the current diameter of the coil 4. This diameter can be determined from the counted revolutions of the mandrel 3 (cf the dotted line 25 emanating therefrom) and the strip thickness. Optionally, a direct measurement of the diameter of the coil 4 is possible, as with an indicated laser-optical measuring means 27.

In any case, it is possible to provide a measurement signal from the strip tension measurement in the reel shaft of a driver control. As an alternative to the illustrated embodiment, this can also be done in the combination strip tension measuring device / band switch by the combination strip tension measuring device / shaft cap. The in the Fig. 2 and 3 shown strip tension measuring device 13 would then be arranged with its role 17 to the winding mandrel 3 integrated into the shaft flap 11, ie, over the line AA of Fig. 2 mirrored. The space then free from the upper drive roller 5 to the strip tension measuring device 13 could in this option be combined with a conventional band switch 9 (cf. Fig. 1 ) filled or bridged.

LIST OF REFERENCE NUMBERS

1

reel slot

2

metal band

3

mandrel

4

Federal / Coil

5

upper driver role

6

lower driver role

7

Table (control table)

8th

capstan

9

bandpass filter

10

cylinder

11

bay door

12

cylinder

13

strip tension measuring device

14

swivel arm

15

soft body

16

roller arm

17

role

18

joint

19

retaining element

20

dynamometer

21

force axis

22

Driver control device

23

soft roll

24

Rotary table

25

measuring signal

26

measuring signal

27

laser-optical measuring device

Claims (12)

1. Method of coiling metal strips (2) on a coiling mandrel (3), which is arranged in a coiler shaft (1) and to which the metal strip is fed by a driver having a lower and an upper driver roller (5, 6), wherein a table (7) is provided below the metal strip (2) for guidance and a strip diverter as well as a pivotable shaft flap (11), which adjoins as far as the vicinity of the coiling mandrel, are arranged above the metal strip, characterised in that the longitudinal tension force, which is exerted on the metal strip (2) by the driver, for controlling the strip running through the driver is detected by means of a strip tension measuring device (13) dipping from above into the metal strip (2) in the coiler shaft (1) and the measurement signal is fed to a driver regulating device (22).
2. Method according to claim 1, characterised in that the wedge angle of the tension distribution is determined from the measured bearing forces of bearing means of the strip tension measuring device (13).
3. Method according to claim 1 or 2, characterised in that a looping angle produced by a roller (17) dipping into the metal strip (2) in the case of inward pivotation of the strip tension measuring device (13) is utilised for direct or indirect bearing force measurement.
4. Method according to claim 3, characterised in that the looping angle is kept approximately constant for regulation of the dipping-in depth of the roller (17).
5. Method according to claim 3 or 4, characterised in that the roller (17) is subject to pre-acceleration to the speed of the metal strip (2) prior to inward pivotation.
6. Device for coiling metal strips (2) on a coiling mandrel (3), which is arranged in a coiler shaft (1) and to which the metal strip is fed by a driver having a lower and an upper driver roller (5, 6), wherein a table (7) is provided below the metal strip (2) for guidance and a strip diverter as well as a pivotable shaft flap (11), which adjoins this as far as the vicinity of the coiling mandrel, are arranged above the metal strip, particularly for carrying out the method according to claim 1, characterised in that the strip diverter is constructed as a strip tension measuring device (13) pivotable from above into the metal strip (2) and is provided with a diverter body (15), which comprises a rotatably mounted roller arm (16) carrying a roller (17) at its front end, wherein arranged between the diverter body (15) and the roller arm (16) is force measuring means (20) in signal connection with a regulating device (22) of the driver.
7. Device according to claim 6, characterised in that the diverter body (15) connects a rear-side pivot arm (14) with a front-side pivot arm (14) of the strip tension measuring device (13).
8. Device according to claim 7, characterised by at least one pivot cylinder (10), which acts on the rear-side pivot arm (14), with stroke regulation.
9. Device according to any one of claims 6 to 8, characterised in that the roller (17) mounted in the roller arm (16) is drivable.
10. Device according to any one of claims 6 to 9, characterised in that a driven diverter roller (23) is arranged at the rotational axis, which is remote from the roller arm (16), of the strip tension measuring device (13).
11. Device according to any one of claims 6 to 10, characterised in that at least one front section of the table (7), which adjoins the lower driver roller (6) below the metal strip (2), is constructed as a pivot table (24).
12. Device according to any one of claims 6 to 11, characterised in that the strip tension measuring device (13) together with the roller arm (16) is arranged to be integrated in the upper shaft flap (11) to face the coiling mandrel (3).

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