EP1558409B1 - Rolling mill comprising support plates - Google Patents

Abstract

In order to shorten the delivery path of working rolls for their replacement in a rolling mill with support plates which are provided on an operating side (BS) of roll stands (F 1 -Fi), are displaced transversely to roll axes, are outfitted for receiving working roll sets ( 4 ), and are located adjacent to a mill floor level ( 7 ) for transporting the working rolls ( 4 ) back and forth, and with trenches ( 10 ) which are arranged upstream of respective roll stands (F 1 -Fi) on the operating side (BS) and a base ( 11 ) of which is outfitted for delivery of back-up roll sets ( 9 ), it is suggested that a transport device ( 12 ) be associated a transport device ( 12 ) is associated with the support plates ( 2 ) for transporting respective support plates ( 2 ) back and forth between a position for replacing the working rolls and in which the support plates ( 2 a) are arranged immediately adjacent to the roll stands above the trenches ( 10 ), and a position of replacing back-up rolls and in which the support plates ( 2 c) are located beneath the mill floor level ( 7 ) adjacent to a trench region.

Description

The invention relates to a rolling mill with provided on the operating side of the scaffolds and slidable transversely to the roll axes support plates or platforms. These support plates are for changing the sets of work rolls by transverse displacement and thus equipped to accommodate sets of work rolls from the rolling stands in particular with pairs of rails and adjoin the hut floor, so that the work rolls can be transported on and off. The scaffolds are preceded by pits, the reason for the extension for supporting roller sets, in particular with extension rails, is equipped.

Such a rolling mill with transversely displaceable, i. in the rolling direction or against the rolling direction displaceable support plates, is known from DE 43 21 663 A1. The pits, which are located between the rolling stands and the transversely displaceable support plate line, are overlapped with hinged 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. The work rolls are towed by tractors from the scaffold to the flaps to the support plates, with both the flaps and the support plates being equipped with corresponding pairs of rails. By transversely moving the support plates, a new pair of work rolls parked on a parallel pair of rails on each support plate is then pushed in front of the rolling stands and inserted 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.

In this known rolling mill with closable pits between the scaffolds and the individual support plates, the work rolls must be moved over the flaps on the support plates in each case.

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 the work roll change can be achieved within a shorter time sequence.

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

The central idea is that the transversely displaceable support plates are transported by means of a conveyor from a position to the work roll change by lowering transversely to the rolling direction in the direction of the control platform through the pits in an adjacent area below the mill hallway in a position for supporting roller change and back. In the work roll position, the support plates are located directly on the rolling stands and themselves form the upper end of the pits. The transverse displacement is arranged directly in front of the rolling train. Therefore, the travel distance of the work rolls can be minimized and thus the time required to change the work rolls can be reduced to a minimum. The support plates are inclined downwardly through the pit area between a first position where they are located immediately adjacent to the rolling stands above the pits and a second position in which they are located in front of the pit (as viewed from the control stage) below the hut corridor sunk through, while maintaining their orientation during the transport movement.

The support means for the support plates may for example be an extendable lift, which accomplish the lowering movement of the plates below the hut floor and the movement from the necessary for the support roller sets pit area out.

According to a particularly preferred embodiment, the conveying device comprises an undercarriage with rollers. The support plate itself is slidably disposed to a table of the undercarriage to allow the transverse displacement along the support plate line. Ramps are arranged at the bottom of the respective pit, which rise in the direction of the roll stand. With the help of this undercarriage / ramp solution, an easily implementable and less susceptible to interference conveyor is shown.

A particularly advantageous solution is proposed in that this undercarriage is moved by means of the same piston-cylinder unit, which is also used to transport the support roller set on the pit bottom. In this way, no further drive for the conveyor is necessary.

Thus, the horizontal force movement of the piston-cylinder unit can be implemented in a ramp-up movement, the piston or a piston extending cross member is rotatably connected to a support rod whose other end is rotatably mounted on the underside of the undercarriage table.

In order to move the support plates transversely in the position of the work roll change, they are pressed in particular. For this purpose, the individual support plates need not be connected to each other, but move abutting edge on abutting edge.

Fig. 1

eine Seitenansicht eines Walzwerkes mit Walzgerüsten und einer daran unmittelbar angeordneten Supportplattenlinie mit einzeln versenk- und verfahrbaren Supportplatten;

Fig. 2

die Draufsicht auf das Walzwerk nach Fig. 1;

Fig. 3

die Schnittansicht B-B der Fig. 1 mit einer Supportplatte in der Stellung zum Arbeitswalzenwechsel;

Fig. 4

die Schnittansicht A-A der Fig. 1 mit einer Supportplatte in der Stellung zum Stützwalzenwechsel.

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 directly arranged support plate line with individually retractable and movable support plates;

Fig. 2

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

Fig. 3

the sectional view BB of Figure 1 with a support plate in the position for work roll change.

Fig. 4

the sectional view AA of Fig. 1 with a support plate in the position for the support roller change.

Fig. 1 and 2 show a rolling mill with - here - seven finish rolling stands F1-F7. On the operating side BS (with the opposite drive side is marked AS) of the skeleton line is directly adjacent a line 1 of transversely displaceable support plates 2. Each support plate 2 is provided with along the roll axes provided rail pairs 3. In the illustrated stage of Fig. A used work roll set 4 'has been pulled out on a support plate 2a, while already waiting new sets of work 5 directly on the respective adjacent support plate 2b on their use and are brought by transverse displacement in line with the corresponding rolling mill.

From Fig. 2 it is clear that the support plates 2 adjoin with their pointing away from the rolling stands ends 6 of the hut floor 7, which also with rail pairs (not shown) for arrival or removal of the work roll sets 4.5 with corresponding tractors 8 (see Fig. 3 and 4) is equipped. The transport by means of the tractors 8 can be done, for example, by the method known from DE 43 21 663 A1, after the gears of the tractor engage in racks along the rails. The function of the tractor can also be realized alternatively by a hydraulic cylinder.

The details of the invention are explained with Figs. 3 and 4.

Adjacent to a rolling mill frame Fi with a work roll set 4 and a support roll set 9, a pit 10 is arranged on the operating side BS or in the direction of control platform, the base 11 is equipped with Ausfahrschienen (not shown) for the support roller sets 9. In the position for work roll change, As shown in Fig. 3, this pit 10 is covered by a support plate 2. The support plate 2 covers the pit 10 flush between the mill stand Fi and the adjoining hut floor 7. The tractor sets 8, which transport and remove the work roll sets 4, can move up to the support plates 2 via this hut floor 7. Spent roller sets 4 '' can be directly pulled into the roller workshop WW or driven back therefrom by means of suitable rail tracks The support plates 2 themselves are transported and held by means of a conveying device 12 into the horizontal position shown in Fig. 3. This conveying device 12 here in the form of an undercarriage 13 consists essentially of a table 14 and two pairs of rollers 15a, b arranged thereon, the table 14 itself has on its upper side 16 rails 17 (see Fig. 2) which extend transversely to the roller axes and the The support plates 2 have corresponding rollers 18 which are movable along these railways for transverse displacement, to prevent side coving, a guide 19 is provided between the underside of the respective support plate 2 and the table top 16. In FIG the position shown in Fig. 3 is the undercarriage 13 in the end position on two ramp pairs 20a, b or wedge pairs, for example, with an inclination of about 20 °.

The position of the support plates 2 for supporting roller change is illustrated with Fig. 4. Since the pit is completely filled by the lower part of the support roller set 9, the support plate 2 has been sunk obliquely down into a region 21 adjacent to the pit area 10. For this purpose, the undercarriage 13 along the ramp pairs 20a, b moved away from the mill stand Fi below the mill hallway 7, with corresponding guide cam 22 support the movement. These guide cams 22 prevent lateral displacement of the tables 14 during the lowering and in the lowered position.

The movement of the carriage 13 and thus the support plates 2 is carried out by means of the piston-cylinder unit 23, which also causes the movement of the support roller set 9. A traverse or adapter 24 extending the piston is connected to the support roller set 9 and moves it back by horizontal movement along Ausfahrschienen in the pit 10 and after changing the support rollers. Simultaneously with the extension of the support roller set 9 of the undercarriage 13 is moved from the elevated position in the lowered below the hut corridor 7 position. For this purpose, a push rod 25, which is rotatably centered on the underside of the table 14, engages the undercarriage and pulls it from the ramps in the recessed support plates. The immediately adjacent to the pit 10 end of the hut corridor is provided with a flap 31.

For the up and down movement of the rollers 15a, b of the undercarriage 13 on the ramps 20a, b, the front ramp pair 20a is offset from the rear ramp pair 20b. The extension lines along wedge rails 30 can be seen in particular in the plan view of FIG. Here, by way of example, the support plate 2c associated with the second finishing stand F2 is extended sunk laterally, i. transverse to the rolling direction, while all other support plates 2 are shown in Arbeitswalzenwechselstellung. For clarity, the driven-out work roll set 4 with the new work roll set 5 arranged next to it is shown on the support plate 2c of the first stand F1.

The support plates are preferably not connected to each other, but juxtaposed abutting each other. They are reciprocated by means of two pressure units 26a, b, each of which acts on one end of the support plate line 1. For this purpose, the plates 2 roll along the pairs of rails 17 introduced into the table 14 of the undercarriage 13. Side guide rollers 27, which roll along the guide unit 19 arranged on the table 14, prevent tilting. Each support plate 2 is an adjusting unit 28, the position of which is variably adjustable, assigned, with the help of the respective support plate 2 in the position to the work roll change corresponding to a scaffold Fi can be adjusted. The pressure-cylinder-piston units 26a, b are concealed in the embodiment shown with cover plates 29 (see Fig. 1).

The proposed solution ensures that the support plate line is located directly next to the finishing stands and the transport paths for the work rolls are short. To open the pits, which are covered by the support plates, the support plates are moved by means of a transport device by a lowering and traversing movement. The work roll is changed by a transverse displacement of support plates, for supporting roller change the support plates are lowered and moved in the direction of control platform.

LIST OF REFERENCE NUMBERS

1

Support plate line

Second

Support plates

3

pair of rails

4

Work roll set (4'and 4 "used work roll sets)

5

new work roll set

6

End of the support plates

7

mill floor

8th

tractor

9

Supporting roller set

10

pit

11

pit reason

12

conveyor

13

undercarriage

14

table

15

Rolls (pairs of rolls 15a, 15b)

16

Table top

17

Rails in table top

18

roll

19

guide

20

Ramps (ramp pairs 20a, 20b)

21

area adjacent to the pit area

22

guide cam

23

Piston-cylinder unit

24

traverse

25

pushrod

26

Displacement unit, in particular pressure unit (unit pair 26a, 26b)

27

Side guide rollers

28

adjusting

29

flashings

30

wedge rails

31

flap

F1-F7 (Fi)

Finishing stands

BS

operating side

AS

driving side

WW

Roll workshop

Claims (7)

1. Rolling mill with support plates (2, 2a, 2c), which are provided on the operating side (BS) of the stands (F1-Fi) and are displaceable transversely to the roll axes and which are equipped for reception of working roll sets (4) and adjoin the workshop floor (7) for transport to and away of the working rolls (4), and with pits (10), which are respectively arranged in front of the stands (F1-Fi) on the operating side (BS) and the base (11) of which is equipped for movement out for backing roii sets (9), characterised in that the support plates (2, 2a, 2c) are associated with a transport device (12) which transports the respective support plates (2, 2a, 2c) between a setting for working roll change, in which the support plates (2a) are arranged directly adjacent to the roll stands above the pits (10), and a setting for backing roll change, in which the support plates (2c) are arranged to be lowered below the workshop floor (7) adjacent to the pit region.
2. Rolling mill according to claim 1, characterised in that the transport device (12) comprises an underneath carriage (13) with rollers (15), on which a support plate (2, 2a, 2c) is arranged to be transversely displaceable, and the rollers (15) co-operate with ramps (20) arranged at the base (11) of the respective pit (10), wherein the underneath carriage (13) is movable out of the position below the workshop floor (7) on the ramps (20) and thus into a raised position in the pit (10) and in the end setting the support plates (2a) are flush with the workshop floor (7) for working roll change.
3. Rolling mill according to claim 1 or 2, characterised in that a front and a rear roller pair (15a, 15b) of the underneath carriage (13) as well as corresponding ramp pairs (20a, 20b) are arranged to be offset relative to one another.
4. Rolling mill according to one of claims 1 to 3, characterised in that the underneath carriage (13) co-operates with a piston-cylinder unit in order to be moved between the two settings.
5. Rolling mill according to claim 4, characterised in that this piston-cylinder unit is the backing roll change piston-cylinder unit (23).
6. Rolling mill according to claim 5, characterised in that for assisting the moving-up movement of the underneath carriage (13) on the ramp pairs (20a, 20b) the piston or a cross member (24), which prolongs the piston, of the backing roll change piston-cylinder unit (23) is connected with one end of a pushrod (25), which is arranged by its other end at the underneath carriage (13), in particular centrally.
7. Rolling mill according to one of the preceding claims, characterised in that adjacent support plates (2) are arranged in working roll change setting to loosely abut one another and are displaceable in their entirety in either one or the other direction along the support plate line (1) by means of two displacing units (26a, 26b) respectively arranged at the ends of the support plate line (1).

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