EP2616196B1 - Method for transferring a metal coil - Google Patents

Description

Technical area

The invention relates to a collar transfer device, in particular for transporting metal coils in a coil box.

State of the art

In rolling mill technology, an installation type is known in which a preliminary strip coming from a roughing street is wound up into a coil in a so-called coil box and then unwound for further processing and fed to a finishing train. A coil box is a band reeling device, which initially bends the metal strip coming from the roughing train by means of rotationally driven bending rolls, so that it winds up in a winding trough formed by supporting rolls to form a metal collar. When the metal band is finished wound, the band end becomes the band head of the subsequent finish rolling process. As long as the metal collar is in this winding position, the coil box can not accept another tape.

In order to ensure the largest possible material throughput, therefore, the unwinding process is already started when the metal collar is still in its winding position. One tries to clear this place as quickly as possible in order to be able to wind up the next approaching strip. In order to create this space, a change in the position of the Federal from the winding position into a unwinding position lying in the direction of the finishing whale is required in the coil box.

Since the metal collar in the coil box is easily deformable due to its temperature, the transfer should be as gentle as possible, otherwise damage to the outer layer of the metal collar may occur if, for example, it strikes hard against a stop.

From the WO 2009/103144 A1 a method for transferring a metal collar is known in which the metal collar is supported in sections between two fret positions by means of support rollers, while it is unwound simultaneously. By changing the position adjacent to each other arranged support rollers to achieve that forms in the direction of the transfer path, a so-called "unwinding trough".

In the DE 198 03 091 A1 An operating method for a collar transfer plant is proposed in which support rollers of an up and an unwinding station are respectively arranged on a movable frame part, which are moved towards one another and tilted.

In this case, the metal collar, which usually has a mass of about 10 to 40 t and a relatively high temperature, from about 900 ° C to 1100 ° C, take damage on its outer turn. A piece on the outer circumference is then scrap.

Presentation of the invention

It is an object of the invention to provide a method for transferring a metal collar, with which a transfer that is as gentle as possible is possible, so that little scrap material is produced and that moreover functions reliably.

This object is achieved by a method having the features of patent claim 1. Advantageous embodiments of the invention are defined in the dependent claims.

According to a basic idea of the present invention, the transfer of the metal collar takes place on carrier rollers, the employment of which is predetermined successively with respect to the transport plane in such a way that a roller table depression advancing in the transport direction is formed. The hiring of the respective support rollers by means of associated part-turn actuators, z. B. a hydraulic cylinder. The result is a Bewowungs-sequence that resembles a "wandering wave" and moved the metal collar in a "wave trough". During the transfer process, the metal collar is alternately supported by two or three support rollers. In this case, the federal government is supported in a first fret position by means of two arranged on a first frame part support rollers. The collar is moved out of this position by tilting and lowering this frame part at the same time. As a result, a smooth transition to the subsequent in the transport direction roller table is possible. The active transfer between the support by two or three support rollers can be made very gentle by appropriate control of the drives. As a result, only relatively small forces act on the outer circumference of the collar and the risk of damage is lower.

A stable position of the waistband can be achieved if the waistband is supported in alternating sequence by two or three idlers during the transfer.

In order not to damage the surface of the belt, it is favorable if the peripheral speed of each roller in contact with the belt corresponds to the belt speed.

Brief description of the drawing

To further explain the invention, reference is made in the following part of the description with reference to a non-limiting embodiment of the drawings, from which further advantageous embodiments, details and further developments of the invention can be found. Shown are each temporally successive constellations during the transfer of Metallbundes.

Figur 1

einen Metallbund, nach dem Aufwickeln in einer Aufwickelposition, wobei der Abwickelvorgang bereits begonnen wurde;

Figur 2

eine der Darstellung der Figur 1 zeitlich folgende Konstellation, in welcher der Metallbund aus der Aufwickelposition in eine aus drei Tragrollen gebildete Abwickelmulde bewegt wurde;

Figur 3

eine sich an die Darstellung der Figur 2 zeitlich anschließende Konstellation, in welcher der Metallbund horizontal weiter bewegt wurde und in der Abwickelmulde durch zwei benachbarte Tragrollen gestützt ist;

Figur 4

eine der Darstellung der Figur 3 zeitlich folgende Konstellation, in welcher der Metallbund nach einem fortgesetzten Wegstück in horizontaler Richtung nun in einer Abwickelmulde auf drei stützenden Tragrollen auffliegt;

Figur 5

eine sich an die Darstellung der Figur 4 anschließende Konstellation, welche den Metallbund in einer Position zeigt, in welche er durch gleichzeitiges Anheben und Absenken zweier benachbarter Tragrollen transferiert wurde und nun wieder von zwei Tragrollen gestützt wird;

Figur 6

eine sich dem Szenario der Figur 5 anschließende Konstellation, in welcher die einlaufseitige Tragrolle angehoben ist, so dass der Metallbund wieder durch drei Tragrollen gestützt ist;

Figur 7

eine Darstellung, am Ende des horizontalen Transfervorgangs, in welcher der Metallbund vollständig in die Abwickelposition überführt ist und in dieser Position wieder von zwei Tragrollen gestützt ist und durch eine Rückhalterolle an einem Weiterrollen in horizontaler Richtung begrenzt werden kann.

Show it:

FIG. 1

a metal collar, after winding in a winding position, wherein the unwinding has already begun;

FIG. 2

one of the representation of FIG. 1 chronologically following constellation, in which the metal collar was moved from the winding position into an unwinding trough formed from three support rollers;

FIG. 3

a to the representation of the FIG. 2 temporally adjoining constellation in which the metal collar has been moved horizontally and is supported in the unwinding trough by two adjacent carrying rollers;

FIG. 4

one of the representation of FIG. 3 temporally following constellation in which the metal collar after a continued path in the horizontal direction now flies in an unwinding on three supporting carrying roles;

FIG. 5

a to the representation of the FIG. 4 subsequent constellation, which shows the metal collar in a position in which it was transferred by simultaneously raising and lowering two adjacent carrying rollers and is now supported again by two carrying rollers;

FIG. 6

One is the scenario of FIG. 5 subsequent constellation in which the inlet-side support roller is raised, so that the metal collar is again supported by three support rollers;

FIG. 7

a representation, at the end of the horizontal transfer process, in which the metal collar is completely transferred to the unwinding position and is supported in this position again by two support rollers and by a retaining roller on a Rolling in the horizontal direction can be limited.

Embodiment of the invention

The method according to the invention will be described below by way of example with reference to FIGS FIGS. 1 to 7 illustrated sequence of a collar transfer process explained in more detail. In the drawings, like reference numerals designate the same or similar components.

In the FIG. 1 a metal collar 4 can be seen, which is located in a winding position 5 of a coil box, not shown. This coil box is arranged between a roughing mill and a finishing mill of a rolling mill. The coil box is used for winding and unwinding of the belt 2. The coming of the Vorstrasse metal strip 2 may have a temperature of the usual way about 900 - 1100 ° C; the fully wound metal collar 4 usually has a mass of about 10 to 40 t. During the transfer on the transfer path 31, the metal collar 4 is continuously unwound. In this case, the metal collar 4 rolls in each case with its outer turn at the bottom side arranged ground or support rollers 11, 12,13, 14, 15 from. Like the sketch in FIG. 2 it can be seen, the support rollers 11, 12 are arranged on a common frame part 29. The support rollers 13 and 14 each on an associated pivot arm. The two pivot arms point to the winding position 5. They are pivotable by means not shown pivot drives each about an associated axis 27 and 28 respectively.

The presentation of the FIG. 1 shows a constellation in which the winding is already completed. The band end 2 of the metal collar 4 is already unwound a bit. The tape head of the tape 2 is already supplied to a driver or a finishing mill, not shown.

As long as the metal collar 4 in the in FIG. 1 shown winding position 5, no new pre-strip can be wound up in the coil box. The winding station in the coil box is occupied. It must therefore be released as soon as possible this Aufwickelplatz.

As will be shown below, the method according to the invention provides an approach for a gentle transfer of the metal bundle in the coil box.

According to the invention, the collar transfer takes place by coordinated adjustment of the axes of adjacent support rollers 11, 12, 13, 14 whereby a progressing in the transfer direction 8 "wave trough" is formed, which forms a Abwickelmulde 32 for the unwinding collar 4.

• Ausgegangen wird dabei von einer Lage des Metallbundes 4, in welcher dieser auf zwei Tragrollen 11 und 12 aufliegt (Figur 1). Die beiden Tragrollen 11, 12 sind auf einem Querträger eines ersten Rahmenteils 29 gelagert und drehangetrieben. Der erste Rahmenteil 29 besteht aus einem Querstück und einem Längsstück. Das Querstück und das Längsstück sind starr miteinander verbunden. Wie aus der Figur 1 leicht zu entnehmen ist, bilden das Querstück und das Längsstück die Form eines "T". Das Längsstück des ersten Rahmenteils 29 ist endseitig an einem zweiten Rahmenteil 30 angelenkt. Das erste Rahmenteil 29 und das zweite Rahmenteil 30 bilden zusammen den Tragrahmen 7. Der Tragrahmen 7 fungiert als Winkelhebel: sowohl der erste Rahmenteil 29 als auch der zweite Rahmenteil 30 ist jeweils um eine zugeordnete Schwenkachse 25 beziehungsweise 26 schwenkbar (in den Zeichnungen der Figur 1 bis Figur 7 sind die Antriebe der Übersichtlichkeit wegen weggelassen). Mittels Antriebskraft können die beiden Rollen 11 und 12 in zwei Freiheitsgraden (vertikal, horizontal) verstellt werden. In der Figur 1 ist eine Konstellation gezeigt, in der die beiden Tragrollen 11, 12 durch ihren Abstand zueinander eine nach oben hin offene Mulde bilden, in welcher der Metallbund 4 in einer stabilen Lage aufgenommen ist.

This process of successively positioning adjacent carrying rollers is explained in more detail below on the basis of a time sequence:

• It is assumed that a position of the metal collar 4, in which this rests on two support rollers 11 and 12 ( FIG. 1 ). The two support rollers 11, 12 are mounted on a cross member of a first frame member 29 and rotationally driven. The first frame part 29 consists of a crosspiece and a longitudinal piece. The crosspiece and the longitudinal piece are rigidly interconnected. Like from the FIG. 1 can be easily seen, form the crosspiece and the longitudinal piece the shape of a "T". The longitudinal piece of the first frame part 29 is articulated on the end to a second frame part 30. The first frame part 29 and the second frame part 30 together form the support frame 7. The support frame 7 functions as an angle lever: both the first frame part 29 and the second frame part 30 are each pivotable about an associated pivot axis 25 or 26 (in the drawings of FIGS FIG. 1 to FIG. 7 the drives are omitted for clarity). By means of driving force, the two rollers 11 and 12 in two degrees of freedom (vertical, horizontal) be adjusted. In the FIG. 1 a constellation is shown in which the two support rollers 11, 12 form an upwardly open trough by their distance from each other, in which the metal collar 4 is received in a stable position.

In order to move the metal collar 4 out of this stable position in the direction of the unwinding position 6, the support frame 7 is tilted and simultaneously lowered. Like from the FIG. 2 can be seen, this tilting and lowering takes place by the first frame member 29 is pivoted in the direction of arrow 18 about the axis of rotation 25, and at the same time the second frame member in the direction of the arrow 17 is pivoted downwards. Due to the force of gravity and the onset of strip tension 3, the metal collar 4 begins to move in the direction of transfer 8. The support roller 13 limits this movement for now. The metal collar 4 is now again stable in a unwinding trough 32, which with respect to the in FIG. 1 a little further to the left. The three rollers 11, 12 and 13 carry the metal collar 4 in this position. The transition to this position was gentle and without unduly high force on the lateral surface of the Federation. 4

For further transfer, the first support roller 13 is now pivoted in the direction of the arrow 19 about the axis 27 down, which again due to gravity, the sideways movement of the metal collar 4 in FIG. 3 is continued until the metal collar 4 gently comes to rest in the unwinding trough 32 formed thereby ( FIG. 3 ). In this position, now support two support rollers the metal collar 4, namely the first support roller 13 and the outlet-side support roller 12 of the support frame. 7

Further lowering of the first support roller 13 causes the metal collar 4 to continue its sideways movement in the direction of the unwinding position 6 again. This is supported by a clockwise pivoting movement of the support frame 7, wherein the first frame part 29 about the axis 25th is rotated in the direction of arrow 21. The unwinding trough 32 has therefore moved along with the metal collar 4 rolling on it in the direction of the arrow 8. Now again support three support rollers the metal collar 4 ( FIG. 4 ), namely the outlet-side support roller 12 of the support frame 7 and the lowered first support roller 13 and the second support roller fourteenth

The FIG. 5 Now shows a scenario after a continuation of this principle. After lowering the second support roller 14 about the axis 28 according to the arrow 22 of the metal collar 4 follows in this recess. The lateral movement is supported by pivoting up the first carrying roller 13 in the direction of the arrow 23. As a result, the unwinding trough 32 in FIG FIG. 5 hiked another way to the left. The first support roller 13 and the second support roller 14 support the metal collar 4 in this constellation (FIG. FIG. 5 ). The Bund 4 is also stable again here.

In order to move the metal collar 4 out of this position and further in the direction of the unwinding position 6, the "trough" is shifted further to the left. As in FIG. 5 drawn is the second support roller 14 according to arrow 22 down and the first support roller 13 in the direction of arrow 23 is pivoted upwards. The metal collar 4 now temporarily resides stably on three support rollers, namely the first support roller 13, the second support roller 14 and the frame-fixed support roller 15 (FIG. FIG. 6 ).

Finally, in the last step, the first support roller 13 and the second support roller 14 are pivoted counterclockwise upwards, whereby the metal collar 4 is raised. Once the second support roller 14 is at the level of the frame-fixed third support roller 15, the transfer of the metal collar 4 is completed. The metal collar 4 is now in the unwinding position 6. A roller 10 acts in this last movement section as a retaining role or support role and prevents the metal collar 4 due to the rigid arrangement of the support roller 15 too far in the direction of Driver rolls. To cushion this last transfer step as gently as possible, the support or retaining roller 10 along the double arrow 9 in the horizontal direction is variable. By means of the staff role 10, which rolls on the circumference of the collar 4, it is achieved that the unwinding federal government can be provided towards the end of the band with spikes to prevent compression of the last turns. The horizontal displaceability of the roller 10 allows positioning of the collar eye 20 prior to retraction of a mandrel.

The principle of moving a progressive floor sink has the advantage that the metal collar is constantly in a trough, that is in a stable position. The transfer of the metal collar 4 of support roller to support roller can be done comparatively gently by appropriate employment of the support rollers.

As already mentioned, each of the rollers 11, 12, 13, 14 is rotationally driven. The peripheral speed is set so that no slip occurs between the speed of the belt 2 and the rotational movement of the roller. In order to come as close as possible to this goal, the speed of rotation of the roller also takes into account the linear speed component resulting from the pivoting movement of the roller.

Compilation of the reference numbers used

1

Federal transfer device

2

tape

3

Bandzug

4

Federation

5

first fret position (winding position)

6

second fret position (unwinding position)

7

supporting frame

8th

transfer direction

9

double arrow

10

Support roller (retention roller)

11

first carrying role

12

second carrying role

13

third carrying role

14

fourth carrying role

15

fifth carrying role

16

outlet side roll

17

Pivoting movement of the second frame part 30 downwards

18

Pivoting movement of the first frame part 29 in the direction 8

19

Pivoting movement of the support roller 13 down

20

coil eye

21

Pivoting movement of the first frame part 29 against the erection 8

22

Pivoting movement of the support roller 14 down

23

Pivoting movement of the support roller 13 upwards

24

Pivoting movement of the support roller 14 upwards

25

Pivot axis of the first frame part 29th

26

Pivot axis of the second frame part 30

27

Pivot axis of the third support roller 13th

28

Pivot axis of the fourth support roller 14th

29

first frame part

30

second frame part

31

Transfer distance, distance between the first and the second fret position

32

unrolling

Claims (6)

1. Method for transferring a metal coil (4), in particular a metal coil in a coil box, on a transfer path (31) between a first coil position (5) and a second coil position (6), wherein the metal coil (4) is supported during the transfer on the transfer path (31) in segments by means of support rollers (11, 12, 13, 14, 15), and wherein the metal coil (4) is simultaneously unwound, wherein by changing the positions of support rollers disposed adjacent to each other an unwinding cradle (32) expanding in the direction (8) of the transfer path (31) is formed, wherein the coil (4) is supported by two support rollers (11, 12) disposed on a first frame part (29) in the first coil position (5) and is moved in the direction of the second coil position (6) from said first coil position (5), characterised in that said frame part (29) is simultaneously tilted and lowered.
2. Method according to claim 1, characterised in that the first frame part (29) is pivoted on a second frame part (30) and the tilting and lowering movement is generated by a pivoting movement (18) of the first frame part (29) around an axis (25) and a simultaneous pivoting movement (17) of the second frame part (30) around a different axis (26).
3. Method according to one of claims 1 or 2, characterised in that the metal coil (4) is supported during the transfer in an alternating sequence by two or by three support rollers (11, 12, 13, 14, 15).
4. Method according to claim 3, characterised in that the two support rollers (11, 12) disposed on the first frame part (29) are driven by means of a first actuator unit having the same rotational speed.
5. Method according to one of claims 1 to 4, characterised in that one support roller (13) and a different support roller (14) 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 (22, 23) around each assigned axis (27, 28) of the respective support roller (13, 14) is taken into account when setting the rotational speed.
6. Method according to one of claims 1 to 5, characterised in that the metal coil (4) is supported in the unwinding position (6) by means of an adjustable support roller (10).

Images