EP1572386B1 - Rolling mill comprising means for the change of rolls - Google Patents

Abstract

The invention relates to a rolling mill ( 1 ) comprising several rolling frames (Fi) and support plates ( 7 ) that are provided on the operator side (BS) of the frames (Fi) and can be displaced transversally to the roll axes, said plates being equipped to receive sets of working rolls ( 14 ) and lying adjacent to the mill floor ( 9 ). The mill also comprises pits ( 8 ) that are situated on the operator side (BS) upstream of each frame (Fi), the bottom of said pits being configured to deploy sets of support rolls ( 12 ). The aim of the invention is to reduce the time required to exchange the rolls. To achieve this: the support plates ( 7 ) are arranged in a support plate line ( 6 ), directly adjacent to the rolling frames (Fi) and covering pits ( 8 ); the support plates ( 7 ) are detachably interconnected and in order to exchange the set of support rolls ( 12 ), the support plate line ( 6 ) can be displaced out of the frame area ( 5 ) transversally to the roll axes along the line of the pits, in subgroup ( 17 ) of interconnected support plates or in its entirety ( 6 ), in order to open at least one and if required all pits ( 8 ).

Description

The invention relates to a rolling mill with several rolling stands and provided on the operating side of the scaffolds and slidable transversely to the roll axes support plates, which are equipped to accommodate sets of work rolls and adjacent to the mill hall. The scaffolds are preceded by pits each on the operating side, the reason of which is to extend for supporting roller sets.

There are rolling mills known with pits that are transversely displaceable, i. slidable in the rolling direction or counter to the rolling direction, support plates are overlapped. For the change of the work rolls these are extended by change cylinders from the rolling stands and parked on rail pairs of the support plates. By transversely displacing the support plates, a new set of work rolls parked on a parallel pair of rails on each support plate is pushed in front of the rolling stands. The roll change cylinders can then retract the new work roll sets into the stands. Tractors can take over the used sets of work rolls, if necessary after another transverse displacement of the support plates, and move them to the roller workshop. For the support roller change, in which the support roller sets are moved into the pits, the support plates are lifted by means of cranes and stacked. This requires a considerable amount of time.

To solve this problem, DE 43 21 663 A1 proposes to provide the pits, which are arranged between the rolling stands and the transversely displaceable support plate line, with pivotable flaps. These flaps are for work roll change in a horizontal position, while they give the support roller change by a folding movement, the pit for retracting the support roller sets. In this known rolling mill with over If there are any closable pits between the scaffolding line and the support plate line, the work rolls must be moved over the flaps to the support plates. Only on the support plates takes place the transverse displacement and the exchange of work rolls. The travel is therefore relatively long and correspondingly time consuming.

Based on this prior art, the present invention seeks to provide a rolling mill, in which both the work roll change and the backup roll change can be achieved within a short time sequence, in which the change can be made more efficient and thus the production time of the system can be increased can.

This object is achieved by a device having the features of claim 1. Advantageous developments are described in the subclaims.

The core of the invention is that the support plates, which cover the pits immediately adjacent to the rolling stands and take over the transverse displacement for work roll change, also for the backup roll change individually for a particular scaffolding or completely for the entire rolling mill from the pit and thus scaffolding area partially or completely are movable. For this purpose, the individual support plates are releasably connected to each other, so that either the entire support plate line or the support platform or only individual packages of support plates are movable.
In particular, individual scaffolds of a multi-stand installation can thus be equipped more quickly with new support rollers. In addition, the used or new work rolls can remain standing on the support plates in the position for supporting roller change. Thus, this additional change time is eliminated with each backup roll change.

The traversing area necessary for the procedure of the support plate line is embedded in the hut corridor. He can also be covered with a cover, which forms the hut floor, so that the movement range for other functions, such as a storage space, is available.

As a coupling of the individual plates, a very advantageous bolt-wedge connection is proposed, which can be opened and locked in particular with a special tool which will be described below.

Fig. 1

eine Seitenansicht eines Walzwerkes mit Walzgerüsten und einer hierzu unmittelbar parallel angeordneten Supportplattenlinie mit einem Verfahrbereich für die Supportplatten im vollständig ausgefahrenen Zustand der Supportplattenlinie bzw. Supportplattform;

Fig. 2

die Draufsicht auf das Walzwerk nach Fig. 1;

Fig. 3

eine Schnittansicht durch das Walzwerk;

Fig. 4

die Draufsicht auf das Walzwerk nach Fig. 1 mit nur teilweise ausgefahrener Supportplattenlinie;

Fig. 5

die Schnittansicht F-F der Fig. 1 zur Darstellung der Anordnung der Laufrollen nach einer ersten Ausführungsform des Verfahrbereichs;

Fig. 6

eine Schnittansicht F-F zur Darstellung der Anordnung der Laufrollen nach einer zweiten Ausführungsform des Verfahrbereichs;

Fig. 7

eine Seitenansicht auf eine zweite Ausführungsform des Walzwerks mit einem Verfahrbereich für die Supportplattenlinie unterhalb des Hüttenflurs im ausgefahrenen Zustand;

Fig. 8

eine Seitenansicht auf das Walzwerk unter detaillierter Darstellung der Unterbaus der Supportplatten;

Fig. 9

die Draufsicht des Walzwerks nach Fig. 8;

Fig. 10

die Schnittansicht F-F der Fig. 8;

Fig. 11

die Schnittansicht G-G der Fig. 10

Fig. 12

einen Querschnitt einer Verbindung von zwei aneinander stoßenden Supportplatten mit einer Bolzen-Keil-Verbindung mit einem Keilziehwerkzeug;

Fig. 13

eine Schnittansicht der Fig. 12 mit noch nicht plaziertem Keilziehwerkzeug;

The invention will be explained in more detail with reference to a drawing, in which:

Fig. 1

a side view of a rolling mill with rolling stands and a support plate directly parallel thereto arranged support plate with a travel range for the support plates in the fully extended state of the support plate line or support platform;

Fig. 2

the top view of the rolling mill of Fig. 1;

Fig. 3

a sectional view through the rolling mill;

Fig. 4

the top view of the rolling mill of Figure 1 with only partially extended support plate line.

Fig. 5

the sectional view FF of Figure 1 showing the arrangement of the rollers according to a first embodiment of the Verfahrbereichs.

Fig. 6

a sectional view FF showing the arrangement of the rollers according to a second embodiment of the Verfahrbereichs;

Fig. 7

a side view of a second embodiment of the rolling mill with a travel range for the support plate line below the hut corridor in the extended state;

Fig. 8

a side view of the rolling mill detailing the substructure of the support plates;

Fig. 9

the top view of the rolling mill of FIG. 8;

Fig. 10

the sectional view FF of Fig. 8;

Fig. 11

the sectional view GG of FIG. 10th

Fig. 12

a cross section of a compound of two abutting support plates with a bolt-wedge connection with a wedge-pulling tool;

Fig. 13

a sectional view of Figure 12 with not yet placed Keilziehwerkzeug.

Fig. 1 shows a side view of a rolling mill 1 with here six rolling stands (F1-F6), which are arranged firmly anchored on a foundation 2. The rolling direction WR is marked with the arrow. Before the rolling mill 1, a pair of scissors 3 and a tinder scrubber 4 can be arranged. On the operating side (BS) of the rolling mill and immediately adjacent and parallel to the frame region 5, which is formed by the individual successively arranged rolling stands, a support plate line 6 is arranged from individual support plates 7, as shown in FIG. 2 is illustrated. The support platform, i. the totality of all support plates 7, consists of one support plate 7 per rolling stand F1-F6. These support plates 7 are arranged for working roll change above pits 8, which are located below the hut corridor 9 (see FIG. Subsequent to the framework region 5 extends, seen in the rolling direction WR, the outlet region 10 for the rolling stock. This movement region 11, which is designed as a roller conveyor, is designed so long of its extent that all support plates 7 of the support plate line 6 in their entirety out of the frame region 5 are moved parallel to the outlet region 10 and thus all pits 8 can be released to change the support rollers 12. This extended state of the support platform shown in Figs. 1 and 2. With 6 'the entire moved support platform is marked.

The work roll change or backup roll change with transversely displaceable support plates 7 and pits 8 will be explained with reference to FIG. 3.

In addition to a rolling stand Fi arranged on a foundation 2, there is a pit 8, on the basis of which exit rails 13 for the supporting roller sets 12 are arranged. The extension movement is achieved by means of an extension-cylinder unit 15. To change the work rolls, the respective pits 8 are covered in extension to the hut floor 9 with the support plates 7, which are provided with corresponding pairs of rails for extending and retracting the sets of work rolls 14. Tractors (not shown) drag the used work rolls 14 'onto the support plates 7 and, if necessary, back into the roll workshop. The transverse displacement of the support plates 7 for work roll change is accomplished by means of a hydraulic cylinder 16 (see Fig. 2). When a backup roll change is pending, the support plates 7 are moved over the pits 8 transversely to the roll axes in the travel area 11. The pits 8 are then available for retracting the support roller sets 12 and for changing the support rollers available.

According to the invention, all support plates 7 in their entirety or only subgroups 17 or subpackets of support plates can be displaced to open the pit 8 of a desired individual rolling stand, which is shown in FIG. In order to open the pit 8 of the fourth rolling stand F4 shown here by way of example, the support plates arranged downstream in the rolling direction are moved together with the support plate which is assigned to the fourth rolling stand as a package 17 by the distance from a support plate in the direction of the rolling direction WR. Subsequently, the support roller set 12 of the fourth rolling stand F4 can be retracted and changed into the now open pit 8.

In the embodiment discussed so far, the travel area 11 for the displaced support plates 7 is arranged above the shed corridor 18 behind the rolling mill line. The hut floor 18 in the outlet area is arranged in relation to the hut floor 9 in the frame area - lowered by about 350 mm. Fig. 5 illustrates this, the arrangement of the support rollers 19 of the roller conveyor to promote the support plates 7 in the travel range 11. The carrying rollers 19 are in lowered tracks 20 embedded in the foundation 2. Despite the carrying roller tracks 20 creates a relatively flat surface 21, which can be run over with vehicles such as a truck or a mobile crane. Overall, the support platform is moved over these carrying roller tracks 20 and the hut floor 18. The support rollers may preferably be provided with a two-sided guide collar 22. In this variant with lowered hut floor 18, although the traversing area 11 can be run over by vehicles, it must always be kept free in order to allow the mines to be opened. To avoid this, in another embodiment, the hut floor 23 is increased in the travel area 11 in relation to the hut floor 9 in the framework area, the support plates 7 extend over the support rollers 19 below the hut corridor 23 along the then between the rollers 19 open carrying roller tracks 24 (see Fig. 6). FIG. 7 shows that the carrying roller tracks 24 themselves are provided with a cover 25, so that the support plates 7 or the support platform can be moved under the cover 25. In this way it is achieved that the cover plane and thus the hut floor 23 can be used above the movement level for other purposes.

With the help of Figs. 8 and 9, the substructure in the pit area 8 is illustrated for the achievement of roller conveyors. Along the pit walls, which extend parallel to the roll axis, in the example shown three rollers 26 are mounted on bearing blocks 27 on the foundation 2, wherein the bearing blocks 27 are located between the individual rolling stands Fi. As an advantageous example of a possible drive, in the transition from the frame (5) to the travel area 11 there is a drive rod pinion 28, which is driven via a gear 29 by an electric motor 30 (compare FIGS. 2, 10 and 11). The drive is composed for example of a DC motor, a spur gear, an electromagnetic gear coupling and a shaft that drive the drive pinion 28. The drive pinion gear 28 engages in a drive train toothing 31 on the underside 32 of the individual support plates 7. So that the support plates 7 do not tilt during the movement, are Side guide rollers 33, which roll along the side surfaces of the plates 7, provided, which are also arranged on bearing blocks 34.

In order to enable a movement of the support plates 7 as a complete package or as a support platform or as a sub-package, they must be detachably connected to each other. The abutting plate ends 35, 36 are coupled by means of a particularly advantageous pin-and-spline connection, as illustrated in FIG. 12. For this purpose, flanges 37, 38 are welded to the undersides of the plates, each having a bore for receiving a common pin 39. The extending along the end portions 35, 36 of the plates pin 39 is guided by the flange 37 of a plate and secured by means of a holding plate 40 by means of screws 41, 42 and protrudes beyond the plate end 35 out. On the flange 37 itself guide elements 43 are arranged, which hold the bolt 39 radially and which are spanned with a locking plate 44. To connect two plates, the pin 39 engages the bore in the flange 38 of the other plate. The second plate is positioned by means of a stop edge 45. In a projecting end 46 of the bolt 39, which is provided with a corresponding receiving opening 47, a wedge 48 is then introduced for locking. To open the connection, the wedge 48 is removed and lowered into a wedge storage pocket 49 which is recessed into the plate surface adjacent to the pin 39. This bolt-wedge connection together with wedge pocket 49 provides a secure and less susceptible to interference connection, which withstands the harsh conditions in the rolling mill well.

To open the connection or to remove the locking wedges 48, a wedge-removing tool 50 is provided, as also illustrated with FIG. 13. This wedge-removing tool 50 is composed of a hook 52 rotatably mounted on a rod 51 or lever, and two take-off rollers 53, 54 arranged below the rotary bearing. The Abrückrollen 53, 54, which come to rest on the plate 7, ensure a large lever arm and a defined extraction point for the wedge 48th

With the aid of the proposed rolling mill, it is possible to quickly enable both a work roll change by transverse displacement of the support plates by a small distance and a support roller change by transverse process of the support plates from the respective pit area or the complete scaffolding area in a provided traversing area in the form of a roller conveyor. For this purpose, all support plates are connected to each other and thus provide a total support platform that can be separated as desired. The roll change takes place with the aid of crosswise movable support plates in the rolling direction.

LIST OF REFERENCE NUMBERS

1

rolling mill

2

foundation

3

scissors

4

descaling

5

framework region

6

Support plate line (6 'moved support platform)

7

Support plates

8th

pits

9

Hüttenflur before the rolling mill and in the framework area

10

discharge area

11

traversing

12

backup rolls

13

runout rails

14

Work rolls (14'used work rolls)

15

Deploying cylinder unit

16

Hydraulic Cylinder

17

Subgroups of support plates of the overall platform 6 '

18

lowered hut floor

19

idlers

20

Idlers train

21

flat surface

22

Leadership of the idlers

23

elevated hut floor

24

Support rollers webs

25

cover

26

castors

27

bearing blocks

28

Lantern pinion

29

transmission

30

electric motor

31

Bolt tooth

32

Bottom of a support plate 7

33

Side guide rollers

34

Bearing blocks of side guide rollers

35

End of a plate 7

36

End of a abutting plate. 7

37

Flange on a plate

38

Flange on a plate

39

bolt

40

Retaining plate

41

screw

42

screw

43

guide element

44

Locking plate

45

stop edge

46

projecting end of the bolt

47

Receiving opening in the bolt for wedge

48

wedge

49

Wedge Document Box

50

Keilabziehwerkzeug

51

Rod

52

hook

53

Abrückrolle

54

Abrückrolle

Fi (F1-F6)

rolling mills

WR

rolling direction

BS

operating side

Claims (7)

1. Rolling mill (1) with several roll stands (Fi) and with support plates (7), which are provided on the operating side (BS) of the stand (Fi) and are displaceable transversely to the roll axes and which are equipped for reception of working roll sets (14) and adjoin at the workshop floor (9), and with pits (8) which are respectively arranged upstream of the stands (Fi) on the operating side (BS) and the base of which is equipped for movement out for backing roll sets (12), characterised in that the support plates (7) are arranged as a support plate line (6) directly adjacent to the roll stands (Fi) and covering the pits (8), and the support plates (7) are detachably connected together and that for exchange of the backing roll sets (12) the support plate line (6) is movable transversely to the roll axes along the pit line out of the stand region (5) in subgroups (17) of interconnected support plates or in its entirety (6') for opening of at least one to all pits (8).
2. Rolling mill according to claim 1, characterised in that the movement region (11) of the support plate line is equipped, connected with the stand region (5), as a roller path with support rollers (19) for the support plates.
3. Rolling mill according to claim 1 or 2, characterised in that the workshop floor (18) is lowered in the movement region (11) of the support plate line, which adjoins the stand region (5), by comparison with the workshop floor (9) in the stand region (5) and the support plate line is movable above the workshop floor (18).
4. Rolling mill according to claim 1 or 2, characterised in that the workshop floor (23) is arranged to be elevated in the movement region (11) of the support plate line, which adjoins the stand region (5), by comparison with the workshop floor (9) in the stand region (5) and the support plate line is movable below the workshop floor (23).
5. Rolling mill according to claim 4, characterised in that movement region (11) is provided with a cover (25), which is arranged at a spacing from the support rollers (19), and this cover (25) forms the workshop floor (23) in the movement region (11).
6. Rolling mill according to one of the preceding claims, characterised in that the detachable connection between the support plates (7) is a pin and wedge connection (39, 48).
7. Rolling mill according to one of the preceding claims, characterised in that arranged in the support region (5) for the transport of the support plates (7) are guide rollers (26) arranged in bearing blocks (27), which extend approximately along the pit walls and parallel to the roll axes.

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