EP1951452B1 - Method and device for changing rolls - Google Patents

Abstract

The invention relates to a method for changing rolls, in particular, working rolls and/or intermediate rolls in a roll stand, such as a roughing down stand or finishing stand for rolling thick sheet iron. Said rolls comprise back up roller sets and working roller sets. One individual locomotive mechanism is used for changing the working rolls and/or for changing the back up rolls and/or for inserting or withdrawing a roll changing seat by supporting the rolls on each other and subsequently withdrawing in the axial direction of the rolls on the operational side of the roll stand, from a roll hall in a roll workshop and back and for installing novel roll sets. The invention also relates to a device for carrying out said method.

Description

The invention relates to a roll change pit, which connects a rolling hall with a rolling mill, wherein in the rolling hall, a rolling mill with working and support rollers is arranged; and wherein in the roll change pit in the axial direction of the working and support rollers, a locomotive is movable for transporting used back-up rolls or work rolls from the rolling stand to the roll workshop or for transporting new back-up rolls or work rolls from the roll workshop to the rolling stand.
The invention further relates to a method for changing a set of work rolls in a rolling stand, such as roughing or finishing stand for rolling heavy plate, comprising the following steps: supporting the used work rolls of the set of work rolls; and then extending the used work roll set in the axial direction of the work rolls on the operating side of the rolling stands from a rolling hall into a rolling mill by means of a locomotive, which is moved in a roll change pit which connects the rolling hall with the rolling mill; and a method of changing a back-up roll set in a rolling stand, such as roughing or finishing stand for rolling plate, comprising the steps of: inserting a roll changing chair by means of a locomotive and a push rod between the used lower back-up roll and the used upper back-up roll; and transporting the used support roller set in the axial direction of the support rollers on the operating side of the rolling stands, from a rolling hall into a roller workshop by means of the locomotive, which is moved in a roll change pit, which connects the rolling hall with the roll workshop.

Such a roller change pit and such methods are known from JP 60 196 211 known.

From the WO 03/099 479 A1 is a device for the change of pairs of work rolls and / or pairs of support rollers on rolling stands known, the backup rolls and the work rolls are each guided in raised or lowered chocks in the stand frame, the pair of work rolls supported on the chocks by means of a Geradschubantriebs is extendable. The pair of support rollers can be extended or retracted by means of a lower support roller supported on a guide track and wheels and a roll change chair supported thereon with a raised upper support roller. In this case, the pair of work rolls on the drive side of the roll stand with a dimensioned for the expansion or the installation path in the stroke length hydraulic piston-cylinder drive can be coupled and disengaged in the Ausfahrabstand. Furthermore, a retracted in the altitude between the support rollers roll changing chair to the same piston-cylinder drive can be coupled and after supporting the upper support roller and the roll changing chair on the lower support roller extendable or retractable the backup roller pair. A corresponding method is known from this.

From the WO 2004/039 512 A1 is a tractor known to be pulled with the roller sets in a roller workshop WW or driven back from there. The tractor is moved by gears of the tractor engage in racks.

From the DE 43 21 663 A1 is a rolling mill with provided on the operating side of the frameworks each supported on trolleys and transverse to the roll axes displaceable support plates known, arranged with at least two juxtaposed, for receiving mounted on rollers work roll sets provided rail pairs are equipped, and with each of the scaffolds upstream pits, the bottom of which are equipped with Ausfahrschienen for support roller sets. In this case, the pits between the stands and the support plates in one of the length of each one fixable in its initial position and verschenkbaren to support roll change out of this flap are covered, and that the flaps each with a the extension of sets of work rolls and convict them on one of the track pairs its associated respective support plates is equipped.

From the WO 03/015 949 A1 a device for changing the working and support rollers of a strip rolling mill is known, wherein by means of a roll carriage movable to the rolling stand, which accommodates the extracted old sets of rolls and the exchange is made possible against new sets of rolls. The device consists of a stationary on Hüttenflurhöhe arranged change cylinder, the piston rod is transversely to the rolling stand and extendable, a Ausziehwagen, which is arranged at the front end of the piston rod of the change cylinder, displaceable on the roll change carriage and with this coupled so that the Ausziehwagen together with the roll changing carriage is displaceable by the change cylinder transversely to the rolling stand. Furthermore, a roller change carriage arranged in the transverse displacement table, which is displaceable transversely to the direction of movement of the roller change carriage by a roll changing car independent displacement cylinder and through which the exchanged roller sets in and out of the frame center aligned (n) change position can be brought. Furthermore, an associated method will be described.

WO 2005/089 972 A1 describes a method for changing sets of rolls in rolling mills of a rolling mill having a plurality of 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 shop and subsequent retraction and installation of new sets of rolls. It will be the transported by a number on the operator side of the number of rolling stands number of separate Querverschiebewagen, worn sets of work on a single connecting track consecutively spent by a single locomotive in the roller workshop and then driven back the sets of work rolls and discontinued at alternating distances on the respective transverse transfer carriage between the rolling stands and that after releasing the operator side by the transverse transfer carriage each extended after a worn set of work rolls, the worn support roll sets and brought by crane in the roll workshop, maintained, transported back and re-installed in the associated rolling stands. Further described is an associated device.

A device for changing rolls of a roll stand is in the DE 31 23 933 A1 disclosed.

The EP 0 911 089 A2 discloses an apparatus and method for rapid roll change on a six-high rolling stand.

The invention has for its object to provide a flexible method for changing the sets of rollers from the rolling stands and a roll change pit with a locomotive for performing the method according to the invention in device technology.

This object is achieved in that at a roll change pit according to the preamble of claim 1, the roll change pit at its two edges in the upper wide range of platforms, which are folded down during transport of the work rolls and folded up during transport of the support rollers; and that the platforms have guide rails and a space at their top.

• 4 Elektromotoren, a 50 kW
• 4 Getriebe-Übersetzungen
• 4 Ritzel
• 2 Kabeltrommeln mit Kabel
• die komplette Elektronik
• die Montage usw.

nicht mehr benötigt.By using only one locomotive will the previously used or required second locomotive with all its facilities such

• 4 electric motors, a 50 kW
• 4 gear ratios
• 4 pinions
• 2 cable drums with cable
• the complete electronics
• the assembly etc.

no longer needed.

Further embodiments of the device will become apparent from the relevant subclaims.

• Aufeinanderstützen der gebrauchten Arbeitswalzen des Arbeitswalzensatzes; und anschließendes Ausfahren des gebrauchten Arbeitswalzensatzes in Achsrichtung der Arbeitswalzen auf der Bedienseite der Walzgerüste aus einer Walzhalle in eine Walzenwerkstatt mit Hilfe einer Lokomotive, die in einer Walzenwechselgrube, welche die Walzhalle mit der Walzenwerkstatt verbindet, bewegt wird; wobei zum Ausfahren des gebrauchten Arbeitswalzensatzes Plattformen, die an ihrer Oberseite Führungsschienen aufweisen, am oberen Rand der Walzenwechselgrube heruntergeklappt werden; und das der gebrauchte Arbeitswalzensatz über eine Schubstange mit der Lokomotive verbunden wird und über die Führungsschienen aus dem Walzgerüst gezogen wird.

The invention also relates to a method for changing a set of work rolls in a roll stand, such as roughing stand or finishing stand for rolling heavy plate, comprising the following steps:

• Supporting the used work rolls of the work roll set; and then extending the used work roll set in the axial direction of the work rolls on the operating side of the rolling stands from a rolling hall into a rolling mill by means of a locomotive, which is moved in a roll change pit which connects the rolling hall with the rolling mill; wherein for the extension of the used set of work platforms having guide rails on their upper side, are folded down at the upper edge of the roll change pit; and that the used set of work rolls is connected via a push rod with the locomotive and is pulled over the guide rails from the rolling stand.

• Einschieben eines Walzenwechselstuhls mittels einer Lokomotive und einer Schubstange zwischen die gebrauchte untere Stützwalze und die gebrauchte obere Stützwalze; und Transportieren des gebrauchten Stützwalzensatzes in Achsrichtung der Stützwalzen auf der Bedienseite der Walzgerüste, aus einer Walzhalle in eine Walzenwerkstatt mittels der Lokomotive, die in einer Walzenwechselgrube, welche die Walzhalle mit der Walzenwerkstatt verbindet, bewegt wird; wobei der Walzenwechselstuhl auf am oberen Rand der Walzenwechselgrube heruntergeklappten Plattformen in das Walzgerüst geschoben wird; dass zum Transportieren des gebrauchten Stützwalzensatzes aus dem Walzgerüst bis in die Walzenwerkstatt die Plattformen hochgeklappt werden; und dass die Stützwalzen mit dem dazwischen angeordnetem Walzenwechselstuhl als komplette Einheit von der Lokomotive in die Walzenwerkstatt gezogen werden.

The invention further relates to a method for changing a back-up roll set in a roll stand, such as roughing stand or finishing stand for rolling heavy plate, comprising the following steps:

• Inserting a roller changing chair by means of a locomotive and a push rod between the used lower support roller and the used upper support roller; and transporting the used backup roll set in the axial direction of the backup rolls on the operating side of the rolling stands, from a rolling hall to a rolling mill by means of the locomotive, which is moved in a roll change pit which connects the rolling hall with the rolling mill; wherein the roll changing chair is pushed into the rolling stand on platforms folded down at the upper edge of the roll change pit; that for transporting the used support roller set from the rolling stand to the roller workshop, the platforms are folded up; and that the support rollers are pulled with the interposed roller change chair as a complete unit of the locomotive in the roller workshop.

For this purpose, the only locomotive with a first coupling device for coupling the support rollers and a second coupling device for coupling the work rolls and for coupling a roll change chair is formed. The fact that both the work rolls and the backup rolls and the roll change chair can be coupled to the same or single locomotive, a still required in the prior art second locomotive can be saved or eliminated. With the second locomotive all associated facilities such as rails, etc. are saved.

Further embodiments of the method will become apparent from the relevant subclaims.

The entire transport of the roller sets is done with only one hydraulic roller change - locomotive. All sets of rolls are transported from the roll stand to the roll shop or back into the roll stand.

Work roll change with side shifting

The work roll changing device is located on the operating side of the rolling mill.

The tasks of the work rolls - changing device is to pull used sets of work rolls from the rolling mill and then, for example, to transport to the roll workshop or to transport the newly ground sets of work rolls from the rolling mill to the rolling mill.

The platforms on both sides, on which the sets of work rolls are transported, are welded steel structures and serve as a roadway underlay during the roll change. On these platforms, the work roll sets are moved to get from the rolling stand to the rolling mill or back into the rolling stand. Sliding strips / slide rails are screwed on these platforms, which serve as slideways for the drawbar with an attached work roll set. The platforms simultaneously cover the area of the roll change pit. They are hinged and held by a pivot point. For load suspension, they are supported on the side of the foundation.
Such platforms allow a work roll change with a hydraulic roll change locomotive, which is arranged in the lower part of the roll change pit.
The used sets of work rolls are now being transported from the rolling stand to the rolling mill by the locomotive or the new sets of work rolls in the rolling stand.
Less maintenance,
Hall crane in the rolling hall no longer needs to be laid out for the wiping of the supporting roller sets.

A trolley for transporting the sets of rolls from the rolling hall to the roller workshop or back to the rolling hall is no longer needed.

The platforms have a weight reduction of about 50%. Furthermore, 30 t racks with mounting material and keyway are no longer needed. The elaborate processing on the platforms for attaching the racks is eliminated.

When preparing for the backup roll change, we only needed to unfold or close the platforms of the hall crane. Due to their low height (width), the open platforms do not disturb the overhead crane operation.
Removal of the platforms by the hall crane is not required. There is also no space needed for storing the platforms in the halls. Therefore time savings.

Side shifting / transverse shifting in the rolling hall.

The side shifting is arranged in the rolling hall in the area of the roll change pit. The task of the side shifting is to move the used work roll set pulled out of the rolling mill stand so far out of the roll center / center roll change pit until the new work roll set can be positioned in the center of the roll.

When changing car racks are no longer needed with mounting material and passport.

The elaborate processing for attaching the racks as well as the complete changing carriage centering is eliminated.

Backup roll change

The back-up roll changing device is disposed in the lower portion of the roll exchange pit.

The tasks of the back-up roll changing device are to transport used back-up roll sets from the rolling stand to the roll shop or the new back-up roll sets from the roll shop to the rolling mill stand.

The platforms on both sides, on which the work rolls are transported, also serve as a roadway underlay for the back-up roll changing chair. On these platforms, the back up roller - changing chair is moved to the roll stand by means of the locomotive to change the support rollers. The currently used work roll shuttle locomotive is no longer needed.

Savings on the backup roll change.

The complete work roll locomotive with all its facilities is no longer needed.

• Kleinerer Hallenkran in der Walzhalle.
• Das Abheben und Aufsetzten der Walzensätze auf den Transportwagen zur Walzenwerkstatt durch den Walzhallenkran entfällt.
• Der Transportwagen mit Antrieb zwischen Walzhalle und Walzenwerkstatt wird nicht mehr benötigt.

Further savings:

• Smaller hall crane in the rolling hall.
• The lifting and placing the sets of rollers on the trolley to the roller workshop by the rolling hall crane deleted.
• The trolley with drive between rolling hall and roller workshop is no longer needed.

Roller changing locomotive for the work roll and backup roll change.

• 4 Hydraulik - Motoren mit Getriebe und Ritzelwelle
• 2 Hydraulikzylinder
• 1 Bajonett - Verschluss für den Arbeitswalzenwechsel
• 1 Bajonett - Verschluss für den Stützwalzenwechsel

With the roll changing locomotive, the work roll and support roll sets are transported from the rolling stand to the rolling mill and / or the new sets of rolls in the rolling stand. The roller change locomotive is located in the lower part of the roller change pit and consists essentially of the housing (car body):

• 4 hydraulic motors with gearbox and pinion shaft
• 2 hydraulic cylinders
• 1 bayonet closure for the work roll change
• 1 bayonet closure for the backup roll change

Hydraulic roller change - locomotive

The support roll change, the work roll change and the retraction of the support roll changing chair into the rolling mill stand are carried out by the hydraulic roll change locomotive.
The currently used work roll shuttle locomotive is no longer needed. Even when using side shifting in the rolling hall or roller workshop, this locomotive transports the backup roller and work roll sets to the roll shop or back to the mill stand.

• Kleinerer Hallenkran
• Das Abheben und Aufsetzen der Walzensätze auf den Transportwagen zur Walzenwerkstatt durch den Walzhallenkran entfällt.
• Der Transportwagen mit Antrieb zwischen Walzhalle und Walzenwerkstatt wird nicht mehr benötigt.

Savings:

• Smaller hall crane
• The lifting and placing the sets of rollers on the trolley to the roller workshop by the rolling hall crane deleted.
• The trolley with drive between rolling hall and roller workshop is no longer needed.

The two-sided platforms on which the work rolls are transported, also serve as a roadway pedestal for the backup roller changing chair. On these platforms, the backup roller changing chair is moved to the roll stand in the rolling stand with the help of the locomotive. The previously used for separate work roll shuttle locomotive is no longer needed.

Fig. 1

im Querschnitt eine Walzhalle mit einem Walzgerüst und einer davon durch eine Wand getrennte Walzenwerkstatt sowie einer Walzenwechselgrube;

Fig. 2

im Querschnitt das Ankuppeln einer Lokomotive an die aus dem Walzgerüst herausgefahrenen Arbeitswalzen ;

Fig. 3

im Querschnitt die Walzhalle mit Walzenwechselstuhl;

Fig. 4

Stützwalzen und Walzenwechselstuhl in der Walzenwerkstatt;

Fig. 5

Walzenwerkstatt mit Stützkonstruktion zur Aufnahme der Arbeitswalzen und

Fig. 6

Walzenwerkstatt wie Figur 5, aber mit Stützwalzen.

An embodiment of the invention is based on very schematic Drawings described in more detail. Show it:

Fig. 1

in cross-section a rolling hall with a roll stand and one of them separated by a wall roller workshop and a roll change pit;

Fig. 2

in cross section, the coupling of a locomotive to the moved out of the rolling mill work rolls;

Fig. 3

in cross section, the rolling hall with roll changing chair;

Fig. 4

Back-up rolls and roll change chair in the roll workshop;

Fig. 5

Rolling workshop with support structure for holding the work rolls and

Fig. 6

Roller workshop like FIG. 5 but with back-up rolls.

In FIG. 1 On the left side a rolling hall 1 in the rolling direction and on the right side a roller workshop 2 is shown. Both areas are separated by a wall 3. In a rolling mill 4, an upper and a lower support roller 5, 6 and an upper and a lower work roll 7, 8 are arranged. For transport from the roll stand 4 in the rolling hall 2 in the roll workshop 2, for example, to re-sharpen the rolls, a locomotive 9 is used. This is located in a pit 10, which connects the rolling hall 1 and the roller workshop 2. All devices such as rails, etc. are built on a foundation or several foundations11. The locomotive 9 can thus be moved from a waiting position 12 at the right end of the pit 10 to the rolling stand 4 out. In the FIG. 1 a is shown in cross section, as the locomotive 9 is arranged in the pit 10. As can be seen, the pit 10 is in a lower narrow area 16 and an upper wide area 17 divided. The lower narrow region 16 is only slightly wider than the locomotive 9. The upper wide region 17 has platforms 20 at its two edges 18, 19. These are folded down during removal or transport of the work rolls 7, 8 and have at their top guide rails 21 on which the work rolls 7, 8 can be moved. The platforms 20 have a distance that allows a mounted on the locomotive 9 at the top 13 coupling device 14 a pass through. For transporting the larger diameter support roll set 5, 6, the platforms 20 are folded up, thus widening the passage. Furthermore, it is shown how the work rolls 7, 8 are located in the rolling hall 1 next to the roll stand 4 for further transport. The work rolls 7, 8 are connected via a push rod 15 with the locomotive 9 and are pulled with this from the rolling stand 4.

As in FIG. 2 illustrated, the push rod 15 is released from the locomotive 9 and the lower work roll 7 and removed. Now the locomotive 9 can be coupled directly to the lower work roll 7. By a method of the locomotive 9 in the pit 10 of the set of work rolls 7, 8 enters the roll workshop. 2

In FIG. 3 It is shown how a roll changing chair 25 is pushed by means of the locomotive 9 and the push rod 15 between the lower support roller 5 and the upper support roller 6 in the rolling stand 4. After the roll changing chair 25 is arranged between the support rollers 5, 6, this complete unit is pulled out of the roll stand 4 by means of the locomotive. At a stop, the push rod 15 is removed. This is followed by a direct coupling of the locomotive 9 to the lower support roller. 5

The locomotive 9 pulls the complete unit in the roller workshop 2, as in FIG. 4 to see. In this case, the platforms 20 are folded up along the right and left edges of the pit 10 to a clearance for the above-mentioned unit of support rollers 5, 6 and roll changing chair 25 and locomotive 9 to have. In FIG. 4a the folded-up platforms 20 can be seen in cross-section, looking at the rolling stand 4 (not shown). On the left side, that is in the rolling hall 1, it is shown how the locomotive 9 is coupled with the support rollers 5, 6 still in the rolling stand 4. On the right side, so in the roller workshop 2, it can be seen how the same locomotive 9 with the coupled support rollers 5, 6 and the roll changing chair 25 are already in a right parking position. It is in this figure only a locomotive 9, but is shown in two places. In the rolling hall 1 is between a left platform 20 and a right platform 20, a gap. This gap forms a free space for a displacement platform 23. With such a displacement platform 23, the space is spanned over the roll change pit 10 and it can both the used work rolls and a new set of work rolls in the rolling hall 1, in or against the rolling direction, be moved. This process is also known as side-shifting. An embodiment of this kind means that the handling of the work rolls takes place when exchanging in the rolling hall.

In FIG. 5 a training is shown in which the work rolls 7, 8 are pulled directly into the roll workshop 2. The platforms 20 are folded down to allow a run over. In the roller workshop 2 is a support structure 26, which simplifies the handling in the processing of the individual work and support rollers. As can be seen, the work rolls 7, 8 are moved into the support structure 26 for this purpose. By a movable on the support structure 26 in or against the rolling direction change carriage 31, the exchange of used and new work rolls. In this embodiment, no side-shifting is provided in the rolling hall 1. Shown is as in FIG. 4 , an embodiment in which the work rolls 7, 8, located in the rolling stand 4, are coupled to the locomotive 9 (left side). On the right side is shown how the same locomotive 9 has already arrived in the roll workshop 2 in its parking / waiting position. Again, only a single locomotive 9 is considered.

FIG. 6 shows an embodiment in which the support rollers 5, 6 are pulled with the locomotive 9 from the framework 4. On the right side are the support rollers 5, 6 already in the roller workshop 2. Since in the rolling hall 1 no displacement platform 23 is present 8 (to replace the work rolls) located in the roller workshop 2, the support structure 26 with the movable there change carriage 31st In a free area, which is located above the roll change pit 10, no support structure 26 is constructed and allows the locomotive 9, the support rollers 5, 6 with the roll changing chair 25 between a left part and a right part of the support structure 26 in the roll workshop. 2 transported and positioned for further handling. The support rollers 5, 6 are, for example, reground and have to be built apart in the roller workshop 2 and spent on certain processing machines. In the rolling hall 1, all platforms 20 are folded up when pulling out the support rollers 5, 6, as in FIG. 6a to see in cross section.

LIST OF REFERENCE NUMBERS

1.

mill hall

Second

Roll workshop

Third

wall

4th

rolling mill

5th

lower support roller

6th

upper support roller

7th

lower stripper

8th.

upper stripper

9th

locomotive

10th

Roll-changing pit

11th

foundation

12th

waiting position

13th

top

14th

coupling device

15th

pushrod

16th

narrow area

17th

wide range

18th

edge

19th

edge

20th

platform

21st

guide rail

22nd

Work rolls

23rd

displacement platform

24th

roll

25th

Roll changing frame

26th

support structure

27th

left part

28th

right part

29th

top

30th

rails

31st

change car

32nd

contraption

33rd

hydraulic cylinders

34th

pushrod

35th

Work rolls

36th

caster

Claims (10)

1. Roll change pit (10) connecting a rolling mill shed (1) with a roll workshop (2), wherein a roll stand (4) with working and backing rolls (5, 6, 7, 8) is arranged in the rolling mill shed (1) and wherein a locomotive (9) is movable in the roll change pit (10) in axial direction of the working and backing rolls for transporting used backing rolls (5, 6) or working rolls (7, 8) from the roll stand (4) to the roll workshop (2) or for transporting new backing rolls or working rolls from the roll workshop (2) to the roll stand (4), characterised in that the roll change pit (10) has at its two edges (18, 19) and in the upper wide region (17) platforms (20) which are folded down during transport of the working rolls (7, 8) and folded up during transport of the backing rolls (5, 6) and that the platforms (20) have guide rails (21) and a spacing at their upper side.
2. Device according to claim 1, characterised in that the locomotive (9) has a coupling device (14) at the upper side (13) thereof, wherein the spacing between the platforms (20) enables passage of the coupling device (14) between the platforms (20).
3. Roll change pit according to claim 1 or 2, characterised in that the roll change pit (10) is subdivided into a lower narrow region (16) and the upper wide region (17) and that the lower narrow region (16) is formed to be only insubstantially wider than the locomotive (9).
4. Roll change pit according to claim 1, 2 or 3, characterised in that the platforms (20) are constructed as welded steel constructions and for acceptance of load are supported laterally at a foundation (11).
5. Roll change pit according to any one of claims 1 to 4, characterised in that the coupling device (14) is constructed as a bayonet connector.
6. Method of changing a working roll set (7, 8) in a roll stand (4), such as a roughing stand or finishing stand for rolling of heavy plate, comprising the following steps:

   placing the used working rolls of the working roll set (7, 8) one on the other and subsequently moving the used working roll set (7, 8) in axial direction of the working rolls on the control side of the roll stand (4) out of a rolling mill shed (1) and into a roll workshop with the help of a locomotive, which is moved in a roll change pit connecting the rolling mill shed (1) with the roll workshop,

   characterised in that for the movement out of the used working roll set (7, 8) platforms (20) having guide rails (21) at the upper side thereof are folded down at the upper edge of the roll change pit (10) and that the used working roll set (7, 8) is connected with the locomotive (9) by way of a push rod (15) and is drawn out of the roll stand (4) by way of the guide rails (21).
7. Method according to claim 6, characterised in that the push rod (15) is coupled to a coupling device (14) at the upper side (13) of the locomotive (9).
8. Method according to claim 6, characterised by movement of a new working roll set out of the roll workshop (2) and into the roll stand (4) with the help of the locomotive (9) by way of the guide rails (21) and installing the new working roll set in the roll stand (4).
9. Method of changing a backing roll set in a roll stand (4), such as a roughing stand or finishing stand for rolling of heavy plate, comprising the following steps:

   pushing a roll change chair (25) by means of a locomotive (9) and a push rod (15) between the used lower backing rolls (5) and the used upper backing rolls (6) and transporting the used backing roll set in axial direction of the backing rolls on the control side of the roll stand (4) out of a rolling mill shed (1) and into a roll workshop (2) by means of the locomotive (9), which is moved in a roll change pit (10) connecting the rolling mill shed (1) with the roll workshop (2),

   characterised in that the roll change chair (25) is pushed into the roll stand (4) on platforms (20) folded down at the upper edge of the roll change pit (10), that the platforms (20) are folded up for transporting the used backing roll set out of the roll stand (4) and into the roll workshop (2) and that the backing rolls together with the roll change chair (25) arranged therebetween are drawn as a complete unit by the locomotive (9) into the roll workshop.
10. Method according to claim 9, characterised by movement of a new backing roll set with the help of the locomotive (9) out of the roll workshop (2) and into the roll stand (4) and installing the new backing roll set in the roll stand (4).

Images