EP1715967B1 - Method and device for exchanging sets of rolls in rolling frames of a rolling mill - Google Patents

Description

The invention relates to a method and a device for changing sets of rolls in rolling stands of a rolling mill with several rolling stands, each having support and work roll sets, by supporting and then extending in the axial direction of a work roll set or a support roll set on the operator side in a roll workshop and subsequent retraction and Installing new sets of rollers.

Such a roller set changeover method is known from DE 43 21 663 A1 known. In this case, on the operator side of the rolling stands supported on trolleys and displaceable transversely to the roll axes support plates are equipped with at least two juxtaposed pairs of rails. The work roll sets themselves are mounted on rollers. Pits are set up in front of the rolling stands, on the basis of which extension rails are provided for supporting roll sets. The pits are covered by flaps, which also carry rails on which the sets of work rolls are extended or retracted. Neither the construction with pits nor the laying of the rails over the pit is particularly favorable.

From the US-A-4,771,626 It is known to transport backup roll sets and sets of work rolls together on a cart. The transfer of the different sets of rollers is characterized by a high design of the very viable trained roller change car dependent and the process is cumbersome.

The invention has for its object to propose a flexible method for changing the sets of rolls from selected rolling stands at device engineering little effort and to tune the process to the workflow in a roller workshop.

The stated object is achieved in that the spent by a number on the operator side of the number of rolling mills number of separate Querverschiebewagen worn sets of work rolls on a single connecting track consecutively spent by a single locomotive in the roller workshop and moved back from there the new sets of work rolls and change intervals be placed on the respective transverse transfer carriage between the rolling stands and that after releasing the operator side by the transverse transfer carriage after a developed, worn set of work rolls extended the support roll sets and brought by crane in the roll workshop, maintained, transported back and re-installed in the associated rolling stands. The method initially separates the changing of the sets of work rolls from changing the sets of support rolls and is therefore more flexible. The method is also cheaper because of the lower cost. Then, the operation can be applied to individual rolling stands and the change of sets of rolls.

A simplification of the known methods in coordination with the roll workshop and a time savings are achieved in that set in a start position in front of each rolling mill, the transverse transfer carriage simultaneously to the change distance, extended work roll sets extended, retracted by transverse process on the other half wagon the new sets of work rolls and the worn sets of work rolls In each case, they are moved from their transverse transfer carriages via sliding strips on the chock into the roller workshop, unloaded and a new set of work rolls is returned to the starting position.

A further simplification is achieved in that in the starting position, respectively, the worn work roll set is pulled onto the associated one half of the wagon and that coming from the roll workshop, the new set of work rolls, which corresponds to the exchange distance in front of the rolling stands, axially spaced on the other half of the carriage is pushed.

A temporal and local selection of rolling sets to be changed and of the rolling stands concerned can also be achieved by successively moving the transverse shifting carriages out of their defined rolling mill installation or removal positions in the rolling direction. As a result, appropriate conditions for the replacement of backup roller sets can be created.

An embodiment of the invention is that in each case over the intermediate plates pivoted in the horizontal repeatable set exactly the distances and the change positions to an adjacent rolling stand between the transverse transfer cars and that the set exchange distances when pivoting or vertical positions of the intermediate plates and / or the connection plates are repealed. This allows an accurate approach of the retraction position of the work roll sets are facilitated in the mill stand.

A further development is given by the fact that for changing the support roller sets by driving away the transverse transfer carriage in front of a rolling mill created a gap and a worn support roller set removed by crane and a new, outdated support roller set is retracted by crane again. As a result, movements of the transport means for work roll sets and support roll sets can be matched to the work schedules of the roll workshop.

As soon as the support roller sets have been moved back into their operating position and locked accordingly in the rolling stand, the procedure continues such that the gap is closed again in front of a roll stand by swiveling in the intermediate plates and the transverse sliding carriages are driven again into the changing distances.

Another embodiment is that empty transverse transfer cars are driven and parked in pivoted-intermediate plates in a parking position at one and / or other end of the rolling train.

The apparatus for changing sets of rolls in rolling mills of a rolling mill with a plurality of rolling stands is based on a prior art, which provides each support and work roll sets, with a drive for Querausbauen or transverse installation of the sets of rollers, parallel to the rolling direction rails for Querverschiebewagen in the foundation and connecting tracks are moved to a roller workshop, and the trolley are connected to a drive.

This object is achieved by a device according to the invention in that the transverse transfer carriage on rails continuously laid in the foundation parallel to the rolling direction between the rolling stands fixed distances are movable, which are controllable by means of pivotable intermediate plates and that only one connecting track perpendicular to the rails in the roll workshop runs on which only a locomotive drives, to each of which a set of work rolls can be coupled and uncoupled. As a result, the cooperation with the roller workshop is more flexible than before, a part of the modules can be automated and the device complexity and investment are relatively low.

A desired space savings in front of the rolling stands is achieved in that the intermediate plates are each in the vertical up or swiveled or adjustable in the horizontal.

Despite the desired in front of the rolling mills open space, it is also advantageous that the Querverschiebewagen, the horizontally pivoted intermediate plates and at the ends of a foundation pit high and horizontally swiveled, fixed rotatably mounted connection plates a continuous form walk-in work surface. These modules can also be operated automatically, so that crane work is saved.

Another automation step is achieved by the fact that at the ends of the rails, which are parallel to the rolling direction, each stationary and hinged mounted connection plates are arranged, which allow moving all Querverschiebewagen together with the pivotable intermediate plates to at least half of a transverse sliding carriage.

In the drawing, an embodiment of the invention is shown, which will be explained in more detail below.

Fig. 1

eine Walzstraße mit drei Walzgerüsten in Seitenansicht,

Fig.1A

einen Walzenständer mit einem Arbeitswalzensatz und einem Stützwalzensatz in Betriebslage,

die Fig. 2 -9

verschiedene Phasen des Wechsels eines Arbeitswalzensatzes in Draufsicht,

Fig. 9A

Parkstellungen der Querverschiebewagen und

Fig. 10

eine Draufsicht auf die Phase "Zwischenplatten aufschwenken" mit Rückkehr zur Startposition gemäß Fig. 2.

Show it:

Fig. 1

a rolling mill with three roll stands in side view,

1A

a roll stand with a work roll set and a support roll set in operating position,

Figs. 2-9

different phases of the change of a work roll set in plan view,

Fig. 9A

Parking positions of the transverse transfer cars and

Fig. 10

a plan view of the phase "swinging intermediate plates" with return to the start position of FIG. 2.

In FIGS. 1 and 1A, the rolling train 1 is formed, for example, from three rolling stands 2, 3 and 4. Each roll stand 2, 3, 4 each has a support roll set 5 in the operating position and worn work roll sets 6 with chocks. In Fig. 1, the Arbeitswalzen- and Stützwalzensätze 5, 6 are already removed and are each on a first Querverschiebewagen 9, a second Querverschiebewagen 10 and a third Querverschiebewagen 11. The work roll sets 6 (or 6a) each consist of two by means of chocks Supports supported on top and bottom rollers, as well (not shown in the expansion phase) support roller sets 5. In Fig. 1 is the Given start position 1a, the roll change takes place on the operator side 1b. A worn set of work rolls 6 is marked from the side (Fig. 1) and from the top in Figs. 2-8, each with a cross in the drawing and as a new set of work rolls 6a without a cross.

On the operator side 1b is a number of the number of rolling stands 2, 3, 4 corresponding separate transverse transfer cars 9,10, 11, which receive from a roll workshop 20 new sets of work rolls 6a. The worn work roll sets 6 are pulled out by means of work roll extension cylinders 8 and a locomotive 21. The movements of the individual transverse displacement carriages 9, 10, 11, which are each equipped with their own travel drive, take place on a single connecting track 14a to the roller workshop 20, the transverse displacement carriages 9, 10, 11 being moved by the rails 14 in the rolling direction 13. The further transport of the rails 14 on the connecting track 14a via slip rails on each chock. The process on the connection track 14a is performed with only a single locomotive 21. The transverse transfer carriages 9, 10, 11 are controlled by spacer means 7. After releasing the operator side 1b by the transverse transfer carriages 9, 10, 11, in each case after a worn worn-out work roll set 6, the worn support roll sets 5 can be extended and brought by crane into the roll workshop 20, re-ground, returned and into the associated rolling stands 2, 3, 4 be reinstalled and locked. The movability of the transverse displacement carriages 9, 10, 11 on the rails 14 in the foundation pit 15a of the foundation 15 secures a respective gap 12 (see also Fig. 9A) for removal or replacement of the support roller sets 5.

The transverse transfer carriages 9, 10, 11 are arranged with a right half for worn sets of work rolls 6 at change distances 2a, 3a, 4a (in three rolling stands) and with the other, left half to new sets of work rolls 6a. The spacing means 7 consist in the exemplary embodiment of pivotable Intermediate plates 7a. The intermediate plates 7a are relatively light and thin, so that a crane is not required for the manipulation.

The work roll sets 6a are, as shown in FIGS. 2 and 3, just arrived from a remote Walzenwe rkstatt 20. The sets of work rolls 6a are coupled to the locomotive 21 and transferred to the transverse transfer carriages 9, 10, 11.

In Fig. 2, the starting position 1a is further shown in front of each rolling mill 2, 3, 4, wherein the transverse transfer carriages 9, 10, 11 are adjusted by means of tilted intermediate plates 7a in the horizontal. The worn work roll sets 6 are then extended (FIG. 3). After transverse processes on the other half of the wagon, the new sets of work rolls 6a are retracted into the respective roll stand 2, 3, 4. The worn work roll sets 6 are then moved to the roller workshop 20 for maintenance. A new work roll set 6a is returned to the start position 1a (FIG. 2), after which the cycle begins again.

A special feature here is that in the starting position 1a each of the worn set of work rolls 6 is pulled onto the associated half of the wagon and that the new set of work rolls 6a, which is set to the alternating distance 2a, 3a, 4a in front of the rolling stands 2, 3, 4, on the another half of the car launched and thereby already an accurate adjustment is made.

According to FIG. 3, all the transverse displacement carriages 9, 10, 11 are lined up with the spacings 2 a, 3 a, 4 a with the intermediate plates 7 a swiveled in. The transverse transfer cars 9, 10, 11 are moved out of these defined rolling mill installation or removal positions in the rolling direction 13 successively.

According to FIG. 4, all new work roll sets 6a are in their installed position relative to the roll stands 2, 3 and 4, and are produced by means of the work roll entry cylinders 8 and the locomotive 21 inserted and then locked in the scaffold.

In Fig. 5, the new sets of work rolls 6a are inserted in the rolling stands 2, 3, 4 and locked in the operating position. During the individual movements, the intermediate plates 7a, which are each pivoted over into the horizontal, are set exactly in the distances and the changing positions to an adjacent roll stand 2, 3, 4 between the transverse displacement carriages 9, 10, 11, wherein the stationarily mounted connection plates 18 at the ends the rails 14 close the remaining gaps. The distances between the transverse displacement carriages 9, 10, 11 can be canceled by pivoting or vertical positioning of the intermediate plates 7a and / or the connection plates 18, as shown in FIG. 6.

The vertical positioning of the intermediate plates 7a and the connection plates 18 creates free space, so that in each case a gap 12 is created for changing the support roller sets 5 by driving away the transverse displacement carriages 9, 10, 11 in front of a rolling stand 2, 3, 4 (see also FIG. A worn support roller set 5 can then be removed by crane and a new, outdated support roller set 5 can be retracted by crane.

According to FIG. 7, the transverse displacement carriages 9, 10, 11 arrive successively in a connection position to the locomotive 21 on the connecting track 14 a. The respective worn set of work rolls 6 is moved to the roll workshop 20 and replaced there by the new set of work rolls 6a.

As shown in FIG. 8, a worn pair of work rolls 6 are respectively driven by the locomotive 21 into the roll workshop 20, where they are again exchanged for a new set of work rolls 6 a and driven back again, which has already been completed in FIG. 8.

According to FIG. 9, the second set of work rolls 6 has already been moved back out of the roll shop 20 with a new set of work rolls 6a. It is only the third worn work roll set to drive 6 in the roller workshop 20.

As shown in Fig. 9A, empty Querverschiebewagen 9, 10, 11 in pivoted or vertically elevated intermediate plates 7a and connecting plates 18 in a left parking position (transverse transfer cars 9, 10) and in a right parking position (transverse transfer carriage 11) driven, wherein the intermediate plates 7a pivoted and the connection plates 18 are raised to save space. As a result, the gap 12 is released before the rolling stands 3 and 4 for other manipulations.

As can further be seen from FIG. 9A, the intermediate plates 7a are each individually articulated on a transverse displacement carriage 9, 10, 11 and are moved up or down with a pneumatic or hydraulic piston-cylinder drive 17 entrained on the carriage. Such piston-cylinder drives 17 are arranged on the connection plates 18 and twice on the first transverse displacement carriage 9 and on one side, on the right of the second and third transverse displacement vehicles 10 and 11.

The transverse transfer carriages 9, 10 and 11 are each moved after loading with a new set of work rolls 6a according to FIG. 10 back into the expansion position in front of the rolling stands 2, 3.4. Subsequently, the intermediate plates 7a are raised to the horizontal and lowered the connection plates 18 in the horizontal. The new sets of work rolls 6a are thus prepared for a quick change of worn sets of work rolls 6 in position. The invention also allows changing of individual worn sets of work rolls 6.

The transverse transfer carriages 9, 10, 11, the horizontally pivoted intermediate plates 7a and at the ends of a foundation pit 15a and high horizontally swivelable, fixed rotatably mounted connection plates 18 form in the horizontal a continuously accessible work surface 19th

1, 2-5 and 10 are at the ends of the rails 14 which extend parallel to the rolling direction 13, each fixed rotatably mounted and adjustable upwards in the vertical connection plates 18, which together with the intermediate plates 7a, the work surface 19th form.

LIST OF REFERENCE NUMBERS

1

rolling train

1a

starting position

1b

operator side

2

rolling mill

2a

hop distance

3

rolling mill

3a

hop distance

4

rolling mill

4a

hop distance

5

Supporting roller set

6

worn work roll set (drawing: with the sign of the cross)

6a

new set of work rolls (drawing: without sign of the cross)

7

spacer

7a

swiveling intermediate plate

8th

Work roll extension / retraction cylinder

9

first transverse transfer carriage

10

second transverse shuttle

11

third cross slide car

12

Gap in front of rolling stand

13

rolling direction

14

rails

14a

Verbindungsgleis

15

foundation

15a

foundation pit

16

distances

17

Piston-cylinder drive

18

fixedly mounted connection plate

19

walk-in work surface

20

Roll workshop

21

locomotive

Claims (13)

1. Method of changing roll sets (5, 6) in roll stands (2, 3, 4) of a rolling train (1) with several roll stands (2, 3, 4), which each have backing and working roll sets (5, 6), by supporting one on the other and subsequent movement out in axial direction of a working roll set (6) or a backing roll set (5) on the operating side (1b) into a roll shop (20) and subsequent movement back and installation of new roll sets (5, 6), characterised in that the worn working roll sets (6), which are transported by a number - which corresponds on the operating side (1b) with the number of roll stands (2, 3, 4) - of separate transversely displaceable carriages (9, 10, 11), are brought in succession on a single connecting track (14a) by a single locomotive (21) into the roll shop (20) and the new working roll sets (6a) are moved back from there and are deposited at change spacings (2a, 3a, 4a) on the respective transversely displaceable carriages (9, 10, 11) between the roll stands (2, 3, 4) and after freeing of the operating side (1b) by the transversely displaceable carriages (9, 10, 11) the worn backing roll sets (5) are moved out each time after a demounted worn working roll set (6) and brought by crane into the roll shop (20), serviced, transported back and reinstalled in the associated roll stands (2, 3, 4).
2. Method according to claim 1, characterised in that in a starting position (1a) in front of each roll stand (2, 3, 4) the transversely displaceable carriages (9, 10, 11) are simultaneously set to the change spacing (2a, 3a, 4a), worn working roll sets (6) are moved out, after transverse movement onto the other carriage halves the new working roll sets (6a) are moved in and the worn working roll sets (6a) are moved each time by their transversely displaceable carriages (9, 10, 11) via slide strips at the chock into the roll shop (20), unloaded and a new working roll set (6a) is brought back again to the starting position (1a).
3. Method according to one of claims 1 and 2, characterised in that in the starting position (1a) in each instance the worn working roll set (6) is drawn onto the associated carriage half and that the new working roll set (6a) coming from the roll shop (20), which set corresponds with the change spacing (2a, 3a, 4a) in front of the roll stands (2, 3, 4), is pushed with axial spacing onto the other carriage half.
4. Method according to one of claims 1 to 3, characterised in that the transversely displaceable carriages (9, 10, 11) are moved in succession out of their defined roll stand installation or demounting positions in rolling direction (13).
5. Method according to one of claims 1 to 3, characterised in that in each instance the spacings and the change positions relative to an adjacent roll stand (2, 3, 4) are repeatedly and precisely set between the transversely displaceable carriages (9, 10, 11) by way of intermediate plates (7a) pivoted into the horizontal and that the set change spacings (2a, 3a, 4a) are cancelled on pivotation or vertical setting of the intermediate plates (7a) and/or the connecting plates (18).
6. Method according to one of claims 1 to 5, characterised in that for change of the backing roll sets (5) by movement away of the transversely displaceable carriages (9, 10, 11) a respective gap (12) is created in front of each roll stand (2, 3, 4) and a worn backing roll set (5) is removed by crane and a new, overhauled backing roll set (5) is moved in again by crane.
7. Method according to claim 6, characterised in that the gap (12) in front of a roll stand (2, 3, 4) is closed again by pivotation in of the intermediate plates (7a) and the transversely displaceable carriages (9, 10, 11) are moved back to the change spacings (2a, 3a, 4a).
8. Method according to one of claims 1 to 7, characterised in that empty transversely displaceable carriages (9, 10, 11) with pivoted-away intermediate plates (7a) are moved into and parked in a parking position at one and/or the other end of the rolling train (1).
9. Equipment for changing roll sets (5, 6) in roll stands (2, 3, 4) of a rolling train (1) with several roll stands (2, 3, 4), which each have backing and working roll sets (5, 6), with a drive for transverse demounting or transverse installation of the roll sets (5, 6), wherein rails (14) for transversely displaceable carriages (9, 11) are laid parallel to the rolling direction (13) in the foundation (15) and connecting tracks (14a) into a roll shop (20) are laid and the transport carriages are connected with a drive, characterised in that the transversely displaceable carriages (9, 10, 11) are movable on rails (14), which are laid continuously in the foundation (15), parallel to the rolling direction (13) to spacings (16), which are fixed between the roll stands (2, 3, 4) and which are controllable by means of pivotable intermediate plates (7a), and that only one connecting track (14a) runs perpendicularly to the rails (14) into the roll shop (20), on which only one locomotive (21) moves, to or from which in each instance a working roll set (6, 6a) can be coupled or decoupled.
10. Equipment according to claim 9, characterised in that the intermediate plates (7a) are each pivotable upwardly or downwardly into the vertical or are settable into the horizontal.
11. Equipment according to one of claims 9 and 10, characterised in that the intermediate plates (7a) are individually articulated in each instance to a transversely displaceable carriage (9, 10, 11) and are pivotable by means of a piston-cylinder drive (17) pivotably mounted at the transversely displaceable carriage (9, 10, 11).
12. Equipment according to one of claims 9 to 11, characterised in that the transversely displaceable carriages (9, 10, 11), the intermediate plates (7a) pivoted into the horizontal and connecting plates (18), which are rotatably mounted in stationary position and which are pivotable-in upwardly and horizontally at the ends of a foundation pit (15a), form a work surface (19) able to be moved over continuously.
13. Equipment according to one of claims 9 to 12, characterised in that the connecting plates (18), which are respectively mounted in stationary position and to be pivotable, are arranged at the ends of the rails (14) extending parallel to the rolling direction (13), which plates allow a movement of all transversely displaceable carriages (9, 10, 11) together with the pivotable intermediate plates (7a) by at least half the transversely displaceable carriage (9, 10, 11).

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