DE102018210889A1 - Method and device for changing support rolls on a roll stand - Google Patents

Abstract

The invention relates to a device (10) and a method for changing support rolls (12) on a roll stand (11). After the work rolls have been extended, a roll change chair (14) is introduced into the roll stand (11) transversely to the rolling direction (W), the roll change chair (14) with a lower part (16) thereof on chocks (18.2) of the lower support roll (12.2 ) can be supported and the upper support roller (12.1) can be lowered onto the roller changing chair (14). The roll change chair (14) is moved into the roll stand (11) via the extension rails (24) provided for the work rolls of the roll stand (11), and after the upper support roll (12.1) has been lowered onto the roll change chair (14), either only the upper support roller (12.1) or a unit formed from the lower and upper support roller (12.1, 12.2) is / are extended from the roll stand (11).

Description

The invention relates to a method for changing support rolls on a roll stand according to the preamble of claim 1, and a corresponding device according to the preamble of claim 9.

According to the prior art, a so-called roll changing chair can be used to change support rolls in a roll stand, which is evident, for example WO 2003/015949 A1 is known. The process here is complex: after the work rolls have been moved out of the roll stand, they have to be removed from the stand area, and a displacement device onto which the work rolls have been extended must also be removed. The lower support roller is then moved out of the roll stand transversely to the rolling direction, the roller changing chair then being placed on the lower support roller from above. Thereafter, the lower support roller in connection with the roller changing chair placed thereon is moved back into the roll stand, the upper supporting roller then being lowered and correspondingly placed on the roller changing chair. Then the lower back-up roll and the upper back-up roll lowered or attached to it with the help of the roll changing chair are moved out of the roll stand together again. After this extension, the upper backup roller can be lifted with an indoor crane and a new backup roller can be placed on the roller change chair. The new backup roller can then be retracted into the stand area in conjunction with the roller mill and the lower backup roller.

The procedure explained above is subject to the disadvantage that, in order to prepare for an exchange of the upper support roller, it is first necessary to move the lower support roller out of the stand area in order to place the roller change chair thereon. Extending the lower support roller and then retracting the lower support roller together with the roller change chair placed on it takes up expensive set-up time. Another disadvantage of this procedure lies in the fact that, as explained, an indoor crane is used to lift the upper backup roller from the roll changing chair after the assembly of the lower backup roller, the roller changing chair and the upper backup roller placed thereon has been moved out Changing the top backup roller is not available for other operations.

Accordingly, the object of the invention is to simplify the replacement of support rolls in a roll stand, in that it can be carried out in a shorter time and thus at a lower cost.

This object is achieved by a method specified with the features of claim 1 and by a device defined by the features of claim 9. Advantageous developments of the invention are defined in the dependent claims.

The method according to the present invention is used to change support rolls on a roll stand. Here, after the work rolls have been extended, a roll change chair is introduced into the roll stand transversely to the rolling direction, the roll change chair with a lower part thereof being supported on chocks of the lower support roll and the upper support roll being lowered onto the roll change chair. The roll change chair is moved into the roll stand via the extension rails provided for the work rolls of the roll stand, and after the upper support roll has been lowered onto the roll change chair, either only the upper support roll or a unit made up of the lower and upper support rolls is moved out of the roll stand will become.

A device according to the present invention serves the same purpose, namely for changing back-up rolls on a roll stand. In such a roll stand, the upper support roll is guided in raisable or lowerable chocks on a stand frame of the roll stand. The device according to the invention comprises a roll changing chair that can be supported on chocks of the lower support roll of the roll stand. The roller changing chair preferably has entry aids with sliding rollers or sliding elements on both sides thereof, which can be brought into interaction with the extension rails provided for the working rolls of the rolling stand in order to move the roller changing chair into the roll stand transversely to the rolling direction. Furthermore, the roller changing chair has a lowering device, by means of which the lower part of the roller changing chair, after the roller changing chair has been introduced into the roll stand, can be supported on the chocks of the lower support roll of the roll stand.

The invention is based on the essential finding that, after the work rolls have previously been moved out of the roll stand, the roll changing chair is then or can be moved into the roll stand via the extension rails provided for the work rolls. These extension rails, which are primarily intended for extending the work rolls, are always referred to as such below. For the sake of one Driving into the roll stand, the roller changing chair is preferably equipped on both sides thereof with entry aids which comprise sliding rollers or sliding elements which can be brought into contact or interact with the exit rails. As a result, the roll changing chair can thus be moved into the roll stand without it being necessary, as in the conventional procedure described at the outset, to first open the lower support roll from the roll stand. As a result, the time for replacing the backup rolls can be considerably reduced.

After the roll change chair has been moved into the roll stand via the extension rails at right angles to the rolling direction, it can be lowered by means of an integrated lowering device within the roll stand in such a way that a lower part of the roll change chair rests on the chocks of the lower support roll. The upper support roller can then be lowered - in a manner known per se - and supported on an upper part of the roller changing chair.

According to a possible embodiment of the invention, it is provided that the roller changing chair forms a unit with its upper and lower part. With such a roller change chair, which, as explained, is supported with its lower part on the chocks of the lower support roller, it is possible to extend the upper support roller, when this is supported on the upper part of the roller change chair, together with the lower support roller from the roll stand ,

According to an alternative and advantageous development of the invention, the roller changing chair is constructed in two parts, namely in the form of an upper part and a lower part. These two parts of the roller changing chair can be coupled and - if necessary - decoupled from each other. Sliding elements, sliding surfaces or rails are provided between the upper part and the lower part of the roller changing chair, which - when the two parts are decoupled from one another - enable a relative displacement between the upper part and the lower part of the roller changing chair. As already explained elsewhere above, the lower part of the roller changing chair can be supported on the chocks of the lower supporting roller by actuating the lowering device mentioned. This two-part embodiment of the roll change chair serves to ensure that the upper support roller, when it is lowered onto the upper part of the roll change chair and supported thereon, then extends out of the roll stand together with the upper part of the roll change chair and independently of a lower support roller, or vice versa the roll stand can be retracted. In any case, it is of essential importance that when the upper support roller is extended or retracted from or into the roll stand, the lower support roll remains stationary within the roll stand and is not moved. This also leads to a reduced set-up time with regard to changing the upper support roller.

The last-mentioned embodiment of the invention, according to which the roll changing chair is formed in two parts in the form of an upper and lower part, is used essentially for removing or changing the upper supporting roll of a roll stand. As explained, the lower part of the roller changing chair is supported on the chocks of the lower support roller. By simultaneously relaxing the lowering device, the weight of the roller changing chair and the upper supporting roller lowered on its upper part are then diverted into these chocks and in any case does not bear on the extension rails of the working rollers.

For both of the above-mentioned embodiments of the roller change chair, it is pointed out separately that if either the unit formed from the upper and lower support roller or only the upper support roller is extended from the roll stand or retracted into the roll stand, then the retracting aids of the roll change chair and their guide rollers or sliding elements with respect to the extension rails are at least reduced in load or substantially free of load.

For the purposes of the present invention, the feature “reduced in load” means that when the roller changing chair is moved, in particular when the upper supporting roller has been lowered thereon, along the extension rails, the lowering device is relaxed to such an extent that a weight of the roller changing chair that is loaded on the extension rails is does not exceed the weight of the work rolls of the roll stand. Conversely, this means that the lowering device is actuated or relaxed to the extent that the main load of the upper part of the roller changing chair, on which the upper supporting roller is also supported, is absorbed by the sliding elements or sliding surfaces, which are between the upper part and the lower one Part of the roller changing chair are provided, and then is derived via the lower part of the roller changing chair into the chocks of the lower support roller. This prevents overloading and thus possible damage to the extension rails.

The invention advantageously enables automated changing of either the upper support roller or a unit formed from the lower and upper support rollers. This change is preferably largely automated, and can also take place fully automated. The targeted retraction of the roller change chair into the roll stand on the extension rails and the subsequent support of the roller change chair on the chocks of the lower support roller means that an otherwise complex manual adjustment of the roller change chair on the extended lower support roller is eliminated. Such an automatic change of at least one support roller, based on the aforementioned lateral retraction of the roller change chair via the extension rails, leads to a considerable saving in set-up time and, at the same time, to increased safety for the operating personnel.

• 1 eine schematisch vereinfachte Seitenansicht eines Teils eines Walzgerüstes, mit einem darin eingefahrenen Walzenwechselstuhl in einer ersten Betriebsposition,
• 2 eine schematisch vereinfachte Seitenansicht des Walzgerüstes von 1, mit einem darin eingefahrenen Walzenwechselstuhl in einer zweiten Betriebsposition,
• 3 eine schematisch vereinfachte Seitenansicht des Walzgerüstes von 2, mit einer auf den Walzenwechselstuhl abgesenkten oberen Stützwalze,
• 4 eine schematisch vereinfachte Seitenansicht des Walzgerüstes von 2 nach einer alternativen Ausführungsform, mit einer auf den Walzenwechselstuhl abgesenkten oberen Stützwalze,
• 5.1, 5.2 eine jeweils vereinfachte Seitenansicht und Draufsicht eines Walzgerüstes in einer Ausgangsposition,
• 6.1, 6.2 eine jeweils vereinfachte Seitenansicht und Draufsicht eines Walzgerüstes mit herausgefahrenen Arbeitswalzen,
• 7.1, 7.2 eine jeweils vereinfachte Seitenansicht und Draufsicht eines Walzgerüstes mit einem auf einer Verschiebeeinrichtung bereitgestellten Walzenwechselstuhl,
• 8.1, 8.2 eine jeweils vereinfachte Seitenansicht und Draufsicht eines Walzgerüstes, mit eingefahrenem Walzenwechselstuhl in einer ersten Betriebsposition gemäß 1,
• 9 eine vereinfachte Seitenansicht eines Walzgerüstes, mit eingefahrenem Walzenwechselstuhl in einer zweiten Betriebsposition gemäß 2,
• 10 eine vereinfachte Seitenansicht eines Walzgerüstes von 9, wobei eine obere Stützwalze auf den Walzenwechselstuhl - gemäß der Darstellung von 3 - abgesenkt ist, und
• 11.1,11.2 eine jeweils vereinfachte Seitenansicht und Draufsicht eines Walzgerüstes, wenn der Walzenwechselstuhl zusammen mit der oberen Stützwalze aus dem Walzgerüst ausgefahren ist.

Further advantages and features of the present invention result from the following description of advantageous embodiments, which are explained in detail on the basis of a schematically simplified drawing. Show it:

• 1 2 shows a schematically simplified side view of a part of a roll stand, with a roll changing chair retracted therein in a first operating position,
• 2 a schematically simplified side view of the rolling stand of 1 , with a roller changing chair retracted therein in a second operating position,
• 3 a schematically simplified side view of the rolling stand of 2 , with an upper back-up roll lowered onto the roll changing chair,
• 4 a schematically simplified side view of the rolling stand of 2 according to an alternative embodiment, with an upper support roller lowered onto the roller changing chair,
• 5 .1, 5.2 a respective simplified side view and top view of a rolling stand in an initial position,
• 6 .1, 6.2 each a simplified side view and top view of a roll stand with the work rolls extended,
• 7 .1, 7.2 a respectively simplified side view and top view of a roll stand with a roll changing chair provided on a displacement device,
• 8th .1, 8.2 each a simplified side view and top view of a rolling stand, with the roller changing chair retracted in a first operating position according to 1 .
• 9 a simplified side view of a roll stand, with the roller changing chair retracted in a second operating position according to 2 .
• 10 a simplified side view of a roll stand of 9 , with an upper backup roller on the roller changing chair - according to the representation of 3 - is lowered, and
• 11 .1,11.2 each a simplified side view and top view of a roll stand when the roll changing chair is extended together with the upper backup roll from the roll stand.

Below are with reference to the 1 to 11 preferred embodiments of a device according to the invention 10 and a corresponding method for changing backup rolls 12 on a roll stand 11 explained. The same features in the drawing are provided with the same reference numerals. At this point, it is pointed out separately that the drawing is only simplified and in particular is shown without a scale.

In the 1-4 are parts of a roll stand 11 each shown in a simplified side view. This shows that the rolling stand 11 an upper backup roller 12.1 and a lower backup roller 12.2 having. The top backup roller 12.1 is in (not fully shown) lifting or lowering chocks 18.1 on a stand frame of the roll stand 11 guided. The lower backup roller 12.2 is on chocks 18.2 arranged or guided.

The device 10 is used to change support rollers 12 on the roll stand 11 , and is intended from the side, that is, transverse to the rolling direction W (see. 1 ) in the roll stand 11 to be run in.

The mill stand 11 includes extension rails 24 , over the work rolls from the roll stand 11 can be pulled out. In the representations of the 1-4 the work rolls are already out of the roll stand 13 been driven out, and thus not shown in these figures.

The device 10 includes a roller changing chair 14 , the entry aids on both sides of it 20 having. These entry aids 20 are equipped with casters or sliding elements, which are collectively referred to below as lubricants 21 and a relative movement of the entry aid on or with respect to the exit rail 24 guarantee. The roll change chair also includes 14 one on the entry guides 20 attached lowering device 22 , whose function is explained separately below.

According to a first embodiment of the device 10 that in the 1-3 is shown is the roll change chair 14 formed in two parts, namely in the form of an upper part 15 and a lower one Part 16 , These two parts 15 . 16 of the roller change chair 14 can be coupled with one another and - if necessary - decoupled from one another. Between the top part 15 and the lower part 16 are sliding surfaces 17 provided that - if the two parts 15 . 16 are decoupled from each other - a displacement of the upper part 15 relative to the lower part 16 enable. As an alternative to sliding surfaces, it is also possible between the two parts 15 . 16 of the roller change chair 14 To provide sliding elements or rails, in the same way, a relative movement of the upper part 15 to the lower part 16 guarantee even under heavy loads (e.g. 60-70 tons).

In an initial state in which the upper part 15 with the lower part 16 coupled, the roller changing chair 14 from the side, ie across the rolling direction W (see. 1 ), in the roll stand 11 be retracted. This is where the lubricants get 21 of the entry aids 20 in contact with the extension rails 24 , and thus enable the roller changing chair to be retracted 14 into the mill stand 11 , The 1 shows the roller changing chair 14 in a first operating position after being completely over the exit rails 24 into the mill stand 11 has been run in.

Regarding this position of the roller change chair 14 it is pointed out separately that the lower part 16 of the roller change chair 14 no contact with the chocks yet 18.2 the lower backup roller 12.2 Has.

In the 2 is the roller change chair 14 shown in a second operating position. Here is the roller change chair 14 by actuating the lowering device 22 lowered down so that the lower part 16 of the roller change chair 14 on the chocks 18.2 the lower backup roller 12.2 supports itself. Thus, a vertical position of the roller changing chair 14 with respect to the lower backup roller 12.2 using the lowering device 22 can be set.

On a top of the top 15 of the roller change chair 14 is a support pan 23 intended. By lowering the chocks 18.1 that of the top backup roller 12.1 are assigned, it is achieved that the chocks 18.1 the upper backup roller 12.1 in the support pan 23 lay down. This is simplified in the representation of 3 shown.

By supporting the lower part as mentioned above 16 of the roller change chair 14 on the assigned chocks 18.2 is achieved that the entry aids 20 in relation to the exit rails 24 are at least reduced or even load-free. In the sense of the present invention, this means that a weight load of the roller changing chair 14 and especially the lower backup roll lowered thereon 12.1 not on the exit rails 24 loads, but first through the sliding elements 17 between the two parts 15 . 16 of the roller change chair 14 added and then over the lower part 16 of the roller change chair 14 in the chocks 18.2 the lower backup roller 12.2 is derived.

The device 10 furthermore comprises a displacement device 26 which is simplified in the side view of 5 .1 or in the top view of 5 .2 is shown. This slider 26 can - according to their name - across the rolling stand 11 be moved, for example in 5 .2 is identified by the arrow Q.

The displacement device 26 is suitable for the roller changing chair 14 is positioned or "parked". The surface of the shifter 26 is dimensioned sufficiently large that the work rolls are also on it 13 of the rolling stand 11 can be included. In the representation of 5 .2 is the space occupied by the work rolls 13 (when this comes from the mill stand 11 have been taken out) is symbolized by dashed lines.

The side views after the 5 .1 - 8.1, after the 9 and 10 , and after the 11 .1 illustrate the use of the device according to the invention 10 and a corresponding method according to the invention. In this regard, it is pointed out that the 5 .2 - 8.2, and the 11 .2, top views of the rolling stand 11 show the side views after the 5 .1 - 8.1, and 11 .1, each correspond.

The 5 .1 and 5 .2 show the roll stand 11 in a state where the work rolls 13 still inside the roll stand 11 are located. On the sliding device 26 is the roller change chair 14 arranged or "parked". Here is the shifting device 26 adjacent to one side of the roll stand 11 arranged, namely such that the available space symbolized by the dashed lines, that for the work rolls 13 is provided with a longitudinal axis L of the rolling stand 11 (see. 5 .2) is in alignment.

The 6 .1 and 6.2 show the roll stand 11 in a state after the work rolls 13 on the adjacent shifting device 26 have been extended. This extension can be done by the work rolls 13 be coupled with a straight thrust drive, for example in the form of a locomotive or a hydraulic piston-cylinder drive in particular, with which the strippers 13 over the exit rails 24 from the mill stand 11 be pulled out.

At this point it is pointed out separately that on an upper side of the displacement device 26 Rails are attached on which the roller changing chair 14 can be moved. These rails are for example in the 6 .2, 7.2, 8.2 and 11.2 with the reference symbol " 28 “Provide them - as far as they go through the roller changing chair 14 or the work rolls 13 are hidden - are only shown in dashed lines. These rails 28 are in their "track width" on the exit rails 24 adapted to the work rolls. Accordingly, it is possible that the roller changing chair 14 over the rails 28 into the mill stand 11 and then the lubricants 21 working on the entry guides 20 are provided in contact with the extension rails 24 reach.

At the top of the slider 26 are also rails 29 provided, the "track width" is smaller than that of the rails 28 , The function of these rails 29 will be explained separately below.

The 7 .1 and 7.2 show the displacement device 26 in a position in which it is compared to the 5 .2 has been shifted in the direction Q so that now the position in which the roller change chair 14 on the shifter 26 is arranged with the longitudinal axis L of the rolling stand is aligned. Starting from this position of the displacement device 26 can now, as by the 8th .1 and 8.2 illustrates the roller change chair 14 over those in the mill stand 11 provided exit rails 24 and the one on the top of the shifter 26 arranged rails 28 into the mill stand 11 be driven in. For this, the roller changing chair 14 can be coupled with a straight thrust drive on the roller changing chair 14 sufficient thrust in the direction of the roll stand 11 exercises. The leadership of the roller changing chair 14 on the rails 28 facilitates its movement in the direction of the roll stand 11 , With the straight push drive (e.g. locomotive or in particular hydraulic piston-cylinder drive) with which the roller change chair 14 coupled, it can be the same linear thrust drive that was previously used for pulling out the work rolls 13 has been used. The position of the roller change chair 14 he was inside the mill stand 11 according to 8th .1 has reached the representation of 1 ,

Now the roller changing chair can 14 inside the mill stand 11 by actuating the lowering device 22 be lowered down. As a result, the lower part 16 of the roller change chair 14 on the chocks 18.2 the lower backup roller 12.2 supported. This position of the roller change chair 14 is in the side view of 9 shown what the representation of 2 equivalent.

This is followed by the upper backup roller 12.1 about the assigned chocks 18.1 on the support pan 23 lowered. Thus the weight of the upper support roller lies 12.1 now on the upper part 15 of the roller change chair 14 , This position of the top backup roller 12.1 is in the side view of 10 shown what the representation of 3 equivalent.

It has already been pointed out that the embodiment of the roller changing chair 14 after the 1-3 is formed in two parts, namely in the form of the upper part 15 and the lower part 16 , Starting from the position of the backup roller 12.1 that in the representations of 3 and 10 is shown, then the upper part 15 of the roller change chair 14 from its lower part 16 decoupled, and then the upper part 15 together with the lower backup roller lowered on it 12.1 laterally from the roll stand 11 extended, for example with the help of the linear thrust drive already mentioned above, that with the upper part 15 is coupled. The upper part moves during this lateral extension 15 of the roller change chair 14 on the sliding elements 17 relative to its lower part 16 , which is stationary within the rolling stand 11 remains. In the course of the lateral extension, the upper part arrives 15 of the roller change chair 14 then on the rails 29 , which - as already explained above - also on the top of the displacement device 26 are attached. The 11 .1 and 11.2 show the upper part 15 of the roller change chair 14 if this together with the upper backup roller 12.1 out of the mill stand 11 on the shifter 26 has been extended or moved.

After the top part 15 of the roller change chair 14 when he hit the shifter 26 and the rails arranged on it 29 has been extended with a new upper backup roller 12.1 has been loaded, the procedure explained above can be carried out in reverse order to this new backup roller 12.1 into the mill stand 11 contribute.

The displacement device 26 can be on top with a platform 30 be provided, which is adjustable in height in the vertical direction. This height adjustment is for example in the 5 .1 by the arrow H symbolizes, and enables adaptation to a possibly different height level between the sliding elements 17 and the rails 29 the shifting device 26 ,

Another embodiment of the device according to the invention 10 is in the 4 shown. In contrast to the embodiment according to the 1-3 is the upper part 15 of the roller change chair 14 either firmly with its lower part 16 connected, or the two parts 15 and 16 are made in one piece - and thus as a common component. This embodiment of the device 10 lends itself to that after the top backup roller 12.1 on the on the top part 15 of the roller change chair 14 provided support pan 23 has been lowered, then the roller changing chair 14 together with the top backup roller 12.1 and the lower backup roller 12.2 - as a unit - from the rolling stand 11 can be pulled out. The upstream retraction of the roller changing chair 14 into the mill stand 11 over the exit rails 24 takes place in the same way as in the two-part embodiment of the roll changing chair 14 so that to avoid repetition on the explanations to the 1-3 may be referred.

Finally, it should be pointed out that the two-part embodiment of the roller changing chair 14 - In the same way as the embodiment of 4 - The upper back-up roller is suitable for this 12.1 together with the lower backup roller 12.2 - as a unit - from the rolling stand 11 out down. It should then be noted that the coupling between the upper part 15 and the lower part 16 of the roller change chair 14 is preserved, so the upper and lower part 15 . 16 after the top backup roller 12.1 on the support pan 23 has been lowered, moved together. This means that then the sliding elements 17 remain out of function.

Notwithstanding the various uses of the roller changing chair explained above 14 is to be noted as a common advantage that this significantly reduces the set-up time for changing at least the upper backup roller 12.1 is possible because the roller change chair 14 - with work rolls already removed 13 - then over the exit rails 24 into the mill stand 11 can be moved in, while the lower backup roller 12.2 still in the mill stand 11 located.

A further reduction in the set-up time is ensured by the above-mentioned processes - in both directions (ie retraction of the roll changing chair) 14 into the mill stand 11 over the exit rails 24 , and then extending at least one backup roller 12 in connection with at least the upper part 15 of the roller change chair 14 ; or vice versa: running in new or "fresh" backup rolls 12 into the mill stand 11 in connection with the roller change chair 14 or its upper part 15 , and then extending the roller change chair 14 from the mill stand 11 over the exit rails 24 ) - in particular, be carried out fully automatically, and thus from a control station (not shown) of a plant to which the roll stand 11 heard, are controllable.

LIST OF REFERENCE NUMBERS

10

contraption

11

rolling mill

12

Support roller (s)

12.1

upper backup roller

12.2

lower backup roller

13

strippers

14

Roll changing frame

15

upper part (of the roller change chair 14 )

16

lower part (of the roller change chair 14 )

17

Sliding elements or sliding surfaces (between the upper part 15 and the lower part 16 of the roller change chair 14 )

18.1

Installation piece (s) of the upper support roller 12.1

18.2

Chock (s) of the lower backup roller 12.2

20

drive-in

21

lubricant

22

lowering

23

support pan

24

runout rails

26

shifter

28

Rails for changing the work rolls (on the top of the shifting device 26 )

29

Rails for changing the upper support roller (on the top of the shifting device 26 )

30

Platform (on the shifter 26 )

L

Longitudinal axis (of the roll stand 11 )

W

rolling direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 2003/015949 A1 [0002]

Claims (16)

Method for changing support rolls (12) on a roll stand (11), in which, after the work rolls (13) have been extended, a roll change chair (14) is introduced into the roll stand (11) transversely to the rolling direction (W), the roll change chair (14 ) with a lower part (16) of which can be supported on chocks (18.2) of the lower support roller (12.2) and the upper support roller (12.1) can be lowered onto the roller changing chair (14), characterized in that the roller changing chair (14) into the roll stand (11) is retracted via the extension rails (24) provided for the work rolls (13) of the roll stand (11), whereby, after the upper support roll (12.1) has been lowered onto the roll changing chair (14), either only the upper support roll ( 12.1) or a unit formed from the lower and upper support roller (12.1, 12.2) is / are extended from the roll stand (11). Procedure according to Claim 1 , characterized in that the roller changing chair (14) has entry aids (20) with sliding rollers or sliding elements which, in order to move the roller changing chair (14) into the roll stand (11) transversely to the rolling direction (W), interact with those for the work rolls of the roll stand ( 11) provided extension rails (24) are brought. Procedure according to Claim 2 , characterized in that if either only the upper support roller (12.1) or the unit formed from the lower and upper support roller (12.1, 12.2) are extended from the roll stand (11) or retracted into the roll stand (11), then the entry aids (20) of the roller change chair (14) with respect to the extension rails (24) are reduced or free of load. Procedure according to one of the Claims 1 to 3 , characterized in that the roller change chair (14) is formed in two parts in the form of an upper part (15) and the lower part (16), the upper support roller (12.1) when it is on the upper part (15) of the roller change chair (14 ) is lowered and supported on it, together with the upper part (15) of the roller changing chair (14) and independently of a lower support roller (12.2) from the rolling stand (11). Procedure according to Claim 4 , characterized in that the upper part (15) and lower part (16) of the roller changing chair (14) can be coupled to one another and sliding elements or sliding surfaces are provided between these two parts which provide a relative displacement between the upper part (15) and the lower part (16) of the roller changing chair (14), whereby, after the lower part (16) of the roller changing chair (14) has been supported on the chocks (32) of the lower support roller (12.2) of the roll stand (11), the upper part ( 15) of the roller changing chair (14) is decoupled from the lower part thereof and then, together with the upper supporting roller (12.1), is extended laterally out of the roll stand (11). Method according to one of the preceding claims, characterized in that the roller changing chair (14), after it has been moved into the rolling stand (11) transversely to the rolling direction (W), is lowered by means of an integrated lowering device (22) and thus its lower part (16 ) is supported on the chocks (32) of the lower support roller of the roll stand (11). Method according to one of the preceding claims, characterized in that a displacement device (26) is positioned adjacent to the roll stand (11), by means of which the roll changing chair (14) is moved into or out of the roll stand (11). Method according to one of the preceding claims, characterized in that moving the roller change chair (14) into the roll stand (11) via the extension rails (24), then lowering the upper support roller onto the roller change chair (14) and extending the roller change chair (14 ) from the roll stand (11) with either only the upper support roller (12.1) or the unit formed from the lower and upper support roller (12.1, 12.2) takes place automatically, in particular fully automatically. Device (10) for changing support rolls (12) on a roll stand (11), the upper support roll (12.1) being guided in liftable or lowerable chocks (18.1) on a stand frame of the roll stand (11), comprising a roll changing chair ( 14), which can be supported on chocks (18.2) of the lower support roller (12.2) of the roll stand (11), characterized in that the roller change chair (14) has insertion aids (20) with guide rollers or slide elements (21) which are used to retract the roller change chair (14) can be brought into the roll stand (11) transversely to the rolling direction (W) in interaction with the extension rails (24) provided for the work rolls of the roll stand (11), and that the roll changing chair (14) has a lowering device (22) by means of that the roller changing chair (14) with its lower part (16) after the roller changing chair (14) has been introduced into the roll stand (11) on the chocks (18.2) of the lower support roller of the W alzgerüstes (11) can be supported. Device (10) after Claim 9 , characterized in that the roller changing chair (14) is formed in two parts in the form of an upper part (15) and a lower part (16), the upper part (15) of the roller changing chair (14) being displaceable relative to the lower part (16) thereof so that this upper part (15), after the upper support roller (12.1) has been lowered and supported on it, can be laterally extended or retracted from the roll stand (11). Device (10) after Claim 10 , characterized in that between the upper part (15) and the lower part (16) of the roller changing chair (14) sliding elements, sliding surfaces or rails (17) are provided, which a relative displacement between the upper part (15) and the lower part ( 16) of the roller changing chair (14). Device (10) after Claim 11 , characterized in that the sliding elements or sliding surfaces (17) are equipped with drive means with which the upper part of the roller changing chair (14) is displaced relative to the lower part thereof. Device (10) according to one of the Claims 9 to 12 , characterized in that the upper part (15) of the roll changing chair (14) can be coupled with a straight-push drive in order to extend or retract this upper part (15) from the roll stand (11). Device (10) after Claim 13 , characterized in that the linear thrust drive is formed from a variable hydraulic piston-cylinder drive or is ensured by means of a locomotive. Device (10) according to one of the Claims 9 to 14 , characterized in that a shifting device (26) is arranged adjacent to the roll stand (11), to which the roll changing chair (14) can be attached, preferably that rails (28, 29) are attached to an upper side of the shifting device (26) which the roller changing chair (14) or its upper part (15) can be moved. Device (10) after Claim 15 , characterized in that a platform (30) is provided on an upper side of the displacement device (26), which is height-adjustable in the vertical direction (H), preferably that the rails (28, 29) for moving the roller change chair (14) on the Platform (30) are attached.

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