Changing device, and method for changing at least supporting rolls of a rolling stand

Abstract

The invention relates to a changing device (10) and to a method for changing at least supporting rolls (13, 14) of a rolling stand (15), comprising a changing means (26) which can be moved into the rolling stand in the case of moved-out working rolls of the rolling stand, wherein the changing means has moving-in means which, in order to move the changing means into the rolling stand, can be brought into engagement with moving-out rails of the rolling stand provided for the working rolls, wherein the changing means can be supported on a lower supporting roll (14), and an upper supporting roll (13) can be lowered onto the changing means in such a way that the lower supporting roll together with the upper supporting roll can be moved out of the rolling stand, wherein the changing means is configured in such a way that the moving-in means can be adjusted during the lowering in order to support the changing means on the lower supporting roll out of an engagement position of the moving-in means, in which the moving-in means are in engagement with the moving-out rails, into a non-engagement position of the moving-in means, in which the moving-in means are not in engagement with the moving-out rails.

Description

[0001] Changing device and method for changing at least support rolls of a rolling stand

[0002] The invention relates to a changing device and a method for changing at least backup rolls of a rolling stand, comprising a changing device which can be moved into the rolling stand when the work rolls of the rolling stand are extended, preferably transversely to a rolling direction, wherein the changing device has moving-in means, preferably designed as running wheels, which can be brought into engagement with extension rails of the rolling stand provided for the work rolls in order to move the changing device into the rolling stand, wherein when the changing device is moved into the rolling stand, the changing device can be supported on a lower backup roll of the backup rolls and an upper backup roll of the backup rolls can be lowered onto the changing device in such a way that the lower backup roll can be moved out of the rolling stand together with the upper backup roll supported on the lower backup roll via the changing device, preferably transversely to the rolling direction.

[0003] A changing device of the type described above is known from DE 10 2018 210 889 A1. The changing device comprises a changing device having a lowering system by means of which the changing device, which has been retracted into a rolling stand, can be lowered onto a lower support roll of the rolling stand to support the changing device. Following the lowering of the changing device onto the lower support roll, an upper support roll of the rolling stand is lowered onto the changing device, so that after the upper support roll has been lowered onto the changing device, the lower support roll can be extended out of the rolling stand together with the upper support roll, which is supported on the lower support roll via the changing device.The disadvantage here is that in addition to lowering the upper support roller onto the changing device, it is always necessary to lower the changing device onto the lower support roller independently of this, which significantly increases the changing time.

[0004] The present invention is therefore based on the object of proposing a changing device and a method for changing at least support rolls of a rolling stand, which enables a simplified changing of at least the support rolls, in particular while shortening a changing time.

[0005] This object is achieved by a changing device having the features of claim 1 and a method having the features of claim 13.

[0006] The changing device according to the invention for changing at least backup rolls of a rolling stand comprises a changing device which can be moved into the rolling stand when the work rolls of the rolling stand are extended, preferably transversely to a rolling direction, wherein the changing device has insertion means, preferably designed as running wheels, which can be brought into engagement with extension rails of the rolling stand provided for the work rolls in order to move the changing device into the rolling stand, wherein when the changing device is retracted into the rolling stand, the changing device can be supported on a lower backup roll of the backup rolls and an upper backup roll of the backup rolls can be lowered onto the changing device, such that the lower backup roll can be moved out of the rolling stand together with the upper backup roll supported on the lower backup roll via the changing device, preferably transversely to the rolling direction, wherein the changing device is designed such thatthat the insertion means are adjustable from an engagement position of the insertion means, in which the insertion means are engaged with the extension rails, to a non-engagement position of the insertion means, in which the insertion means are not engaged with the extension rails, when the upper support roller is lowered onto the exchange device for supporting the exchange device on the lower support roller.

[0007] According to the invention, the changing device is provided for changing at least backup rolls of a rolling stand, wherein an upper backup roll of the rolling stand and a lower backup roll of the rolling stand can be arranged on a stand of the rolling stand via chocks of the upper backup roll and the lower backup roll, respectively. In addition to the backup rolls, the rolling stand can comprise an upper work roll and a lower work roll, between which a roll gap can be formed, into which a rolling stock can be introduced in a rolling direction. The upper work roll and the lower work roll can also be arranged on the stand via chocks of the upper work roll and the lower work roll, respectively. Furthermore, the lower work roll can have wheels, which can be arranged on the chocks of the lower work roll.When the backup rolls are removed, a changing device of the changing apparatus is moved into the roll stand with the work rolls removed, which may have been moved out of the roll stand via the extension rails of the roll stand, the changing device having insertion means, in particular designed as running wheels and / or sliding elements, which are brought into engagement with the extension rails of the roll stand provided for the work rolls in order to move the changing device into the roll stand, wherein when the changing device is moved into the roll stand, the changing device or an underside of the changing device is supported on the lower backup roll or the chocks of the lower backup roll and the upper backup roll is placed on the changing device oran upper side of the changing device is lowered, so that the lower support roll can then be extended out of the rolling stand together with the upper support roll, which is supported on the lower support roll via the changing device. The lower support roll can have wheels, which can be arranged on the chocks of the lower support roll in order to extend the support rolls together out of the rolling stand via the extension rails of the lower support roll.

[0008] According to the invention, the changing device is designed in such a way that the insertion means can be adjusted from an engaged position of the insertion means, in which the insertion means are in engagement with the extension rails, into a non-engaged position of the insertion means, in which the insertion means are not in engagement with the extension rails, when the upper support roller is lowered or as a result of the upper support roller being lowered onto the changing device or the upper side of the changing device for supporting the changing device or an underside of the changing device on the lower support roller or the chocks of the lower support roller. Consequently, the support of the changing device or the underside of the changing device on the lower support roller or the chocks of the lower support roller is ultimately achieved as a result of the upper support roller being lowered onto the changing device orthe top side of the changing device is reached, so that no separate lowering of the changing device onto the lower support roller or the chocks of the lower support roller is required, as in the prior art, thereby significantly reducing the changing time. Specifically, the supporting of the changing device or the underside of the changing device onto the lower support roller or the chocks of the lower support roller is achieved by the adjustment of the retraction means, caused by the lowering of the upper support roller onto the changing device or the top side of the changing device, from the engaged position of the retraction means, in which the retraction means are in engagement with the extension rails or are in contact with the extension rails, to the non-engaged position of the retraction means, in which the retraction means are not in engagement with the extension rails or are in contact with the extension rails.The change device according to the invention thus enables simplified changing of at least the support rolls of a rolling stand, in particular by shortening the change time.

[0009] In a preferred embodiment of the changing device, the changing device can be designed such that the upper support roller can be positively centered on the lower support roller via the changing device in order to ensure optimal transmission of the weight load of the upper support roller to the lower support roller and to reliably avoid relative movement between the support rollers during the extension process of the support rollers from the rolling stand.

[0010] In a preferred embodiment of the changing device, the insertion means for supporting the underside of the changing device on the chocks of the lower support roller can be lifted off the extension rails, so that a gap can be formed between the insertion means and the extension rails. The width of the gap can be a few millimeters, for example 5 mm. In a preferred embodiment of the changing device, the changing device can have a, preferably mechanically actuated, adjustment system for adjusting the insertion means from the engaged position to the non-engaged position. The adjustment system can be actuated by means of the upper support roller or the chocks of the upper support roller when they are lowered onto the changing device or the top side of the changing device.The adjustment system can be designed particularly simply and cost-effectively if it is based exclusively on the interaction of mechanical components, i.e., if it is mechanically actuated. In principle, however, an electromechanical or electrical adjustment system would also be conceivable. For example, an electromechanically actuated adjustment system of the changeover device could comprise an electromechanical switch actuated by the upper support roller or the chocks of the upper support roller. Closing this switch can activate a servomotor of the adjustment system to move the retraction means from the engaged position to the disengaged position.

[0011] In a preferred embodiment of the changing device, the adjustment system can comprise a first piston for each insertion means, preferably a spring-mounted piston, which can be actuated when the upper support roller is lowered or as a result of the lowering of the upper support roller onto the changing device, and a lever element which interacts with the first piston for transmitting an adjusting movement of the first piston to the respective insertion means. When the first piston is actuated by means of the upper support roller or the chocks of the upper support roller when they are lowered onto the changing device or the upper side of the changing device, the first piston can perform an adjusting movement counter to a restoring force of a spring element of the adjustment system, for example a compression spring, which can be transmitted to the respective insertion means by means of the lever element for adjusting the respective insertion means from the engaged position to the disengaged position.When the upper backup roll is subsequently lifted by the changing device, in particular after the backup rolls have been moved out of the rolling stand, the respective insertion means can be adjusted from the non-engaged position back into the engaged position as a result of the restoring force of the spring element. Advantageously, the adjustment system can comprise a first piston for each insertion means. The first pistons can be connected via a pressure plate of the adjustment system which connects the first pistons to one another at the ends and can be actuated or contacted by means of the upper backup roll or the chocks of the upper backup roll when they are lowered onto the changing device or the top side of the changing device. In principle, however, it is also conceivable for two insertion means which are located on opposite sides of the changing device orcan be arranged opposite one another on the side thereof, share a first piston, whereby the first piston can then interact with two lever elements of the adjustment system, which can transmit the adjustment movement to both retraction means.

[0012] In a preferred embodiment of the changing device, the respective retraction means can be arranged on a second piston of the adjustment system that can be moved in the opposite direction to the first piston, wherein the first piston can be coupled to the second piston via the lever element, which can be mounted at a pivot point. When the first piston performs an adjusting movement, this adjusting movement can be transmitted to the second piston by means of the lever element, so that the second piston can perform an adjusting movement opposite to the first piston to adjust the retraction means from the engaged position to the disengaged position. The first piston or the second piston can be movable in a vertical direction.When the first piston moves toward the lower support roller as a result of the upper support roller being lowered onto the change device, the second piston can move toward the upper support roller to lift the retraction means from the extension rails. The second piston can also be spring-mounted, for which purpose the adjustment system can include an additional spring element, for example, a compression spring.

[0013] In a preferred embodiment of the changing device, the changing device can comprise two, preferably block-shaped, support parts and a connecting part connecting the support parts to one another, wherein the insertion means can be arranged on the support parts. The adjustment system can then be arranged in the support parts. The changing device can be arranged between the support rollers in such a way that the support blocks can each be arranged between a chock of the upper support roller and a chock of the lower support roller, wherein the connecting part can then extend along the upper support roller or the lower support roller. The support parts or a respective underside of the support parts can then be supported on the lower support roller or the chocks of the lower support roller, and the upper support roller or the chocks of the upper support roller can be placed on the support parts orIn each case, an upper side of the support parts can be lowered. In other words, the support parts act as spacers. The support parts can advantageously be designed in a welded construction. The connecting part, which can be in the form of a cross member, can advantageously be screwed to the support parts. However, other types of connection between the support parts and the connecting part are also conceivable. At least two insertion means can be arranged on each support part, which can be arranged on opposite sides of the respective support part or opposite one another on the sides thereof. If the insertion means are running wheels, each running wheel can advantageously have its own axle so that each running wheel can rotate independently of the other running wheels.In a preferred embodiment of the changing device, the changing unit can have a support, preferably a hydraulically pivotable support, and a boom, preferably arranged at the end of the support, which can be folded or pivoted relative to the support, wherein the boom can have a storage plate for storing an adjustment device of the rolling stand and / or the boom can be designed for the arrangement of a lifting system, in particular a chain hoist with a trolley, for lifting an adjustment cylinder of the rolling stand. When repairing and servicing the adjustment device and the adjustment cylinders, changing or removing the corresponding components often proves to be very difficult, which is due to the installation situation in the rolling stand. The adjustment device is typically arranged on an upper crosshead of the stand or roll stand. The adjustment cylinder is typically arranged on a lower crosshead of the stand or roll stand.roll stand. Depending on the size of the roll stand, both components can have a mass of several tons. An overhead crane cannot usually be used to change or remove these components, as these components are hidden by other components of the roll stand and are therefore inaccessible to the overhead crane. The embodiment of the changing device in question here advantageously allows not only the changing or removal of the backup rolls but also the changing or removal of at least one of the two components, preferably both components, thereby shortening the changing time. Advantageously, the support can be arranged on the connecting part or integrated into it. Advantageously, the support can be pivoted hydraulically relative to the connecting part by means of a hydraulic cylinder of the changing device, which can be actuated, for example, by means of a hand pump of the changing device.Instead of a hand pump, an automatic or electric pump can of course also be provided. If the adjustment device is to be removed, the support can be pivoted out by 90° or from a substantially horizontal position to a substantially vertical position and fixed in the vertical position, for example with bolts. The boom, which has been pivoted out together with the support, can then be folded up by 90° or from a substantially vertical position to a substantially horizontal position and also fixed in the horizontal position, for example with bolts. The pivoting and folding out can also be carried out in the reverse order or simultaneously. The adjustment device can then be lowered onto the support plate of the boom. The changing device can then be extended out of the rolling stand with the adjustment device placed on the support plate.The adjustment device can now be removed from the support plate using the overhead crane and taken to a repair workshop. The support and the boom can also be used to remove the adjustment cylinder. As described above, the support can be pivoted into a substantially vertical position and the boom folded out into a substantially horizontal position, whereby the support and the boom can each be fixed, for example with bolts. The boom or an underside of the boom can be designed so that a lifting system, in particular a chain hoist with a trolley, can be suspended from the boom. Using the lifting system, the adjustment cylinder can be lifted and placed on one of the support parts or the support part located beneath the boom, whereby the changing device can then be extended out of the rolling stand with the adjustment cylinder placed on the support part.The lifting system can then be unhooked again. After the corresponding component has been replaced or removed, the boom can be folded in again or the carrier can be pivoted in again. The carrier and the boom remain in the changing device and serve as tools. The changing device can comprise the lifting system. The changing device can be stored in a roll workshop. In a preferred embodiment of the changing device, the changing device can comprise a displacement device which can be configured to extend the work rolls, in particular by pulling them, out of the rolling stand and / or to retract the changing device, in particular by pushing them, into the rolling stand and / or to extend the backup rolls, in particular by pulling them, out of the rolling stand. Accordingly, the changing device can be provided for changing backup rolls and work rolls of a rolling stand.If the work rolls are moved out of the rolling stand, the changing device is moved into the rolling stand, and the backup rolls are moved out of the rolling stand using the same shifting device, the changeover time can be significantly reduced. The adjustment device and / or the adjusting cylinder can also be moved out using the shifting device.

[0014] In a preferred embodiment of the changing device, the shifting device can comprise a roll changing carriage and a locomotive arranged on the roll changing carriage, which locomotive can be mechanically coupled to the work rolls and / or the changing device. The roll changing carriage can comprise a drive motor, in particular a rack and pinion drive. The extension of the work rolls from the roll stand and the retraction of the changing device into the roll stand can be effected by a relative movement of the locomotive to the roll changing carriage, while the roll changing carriage can be at rest relative to a base on which the roll changing carriage can be arranged. The extension of the backup rolls from the roll stand can be effected by a relative movement of the roll changing carriage to the base, while the locomotive can be at rest relative to the roll changing carriage.The adjustment device and / or the adjusting cylinder can be extended by means of the roller changing carriage and, if necessary, the locomotive on which the changing device can be arranged during the removal of the component in question.

[0015] In a preferred embodiment of the changing device, the changing device can be arranged on the rails of the roll changing carriage. The rails can be adapted to the design, in particular the track width, of the exit rails, so that the changing device can be moved into the roll stand via the rails and the exit rails connected to the rails when the roll changing carriage is moved up to the roll stand. The locomotive can also be arranged so that it can move along the rails of the roll changing carriage.

[0016] In a preferred embodiment of the changing device, the locomotive can comprise a drive motor, preferably a geared motor, with a holding brake. When the backup rolls are extended from the rolling stand, the locomotive can be fixed relative to the roll changing carriage by means of the holding brake.

[0017] In the method according to the invention for changing at least backup rolls of a rolling stand by means of a changing device, with the work rolls of the rolling stand extended, a changing device of the changing device is moved into the rolling stand, preferably transversely to a rolling direction, wherein the changing device has insertion means, preferably designed as running wheels, which are brought into engagement with extension rails of the rolling stand provided for the work rolls in order to move the changing device into the rolling stand, wherein, with the changing device moved into the rolling stand, the changing device is supported on a lower backup roll of the backup rolls and an upper backup roll of the backup rolls is lowered onto the changing device, wherein the lower backup roll is moved out of the rolling stand together with the upper backup roll supported on the lower backup roll via the changing device, preferably transversely to the rolling direction,wherein the retraction means are adjusted from an engagement position of the retraction means, in which the retraction means are engaged with the extension rails, to a non-engagement position of the retraction means, in which the retraction means are not engaged with the extension rails, when the upper support roller is lowered onto the exchange device for supporting the exchange device on the lower support roller.

[0018] For the advantageous effects of the method according to the invention, reference is made to the description of the advantages of the changing device according to the invention.

[0019] In a preferred embodiment of the method, the work rolls can be moved out of the rolling stand before the backup rolls are changed. The work rolls can then be changed.

[0020] Further advantageous embodiments of the method emerge from the descriptions of the features of the subclaims which refer back to device claim 1.

[0021] To equip the rolling stand with new, fresh or repaired components, i.e. backup rolls, work rolls, adjusting devices or adjusting cylinders, the process explained above can be carried out in reverse order.

[0022] A preferred embodiment of the invention is explained in more detail below with reference to the accompanying drawings. They show:

[0023] Fig. 1 is a partial view of a changing device from one side during an extension of work rolls of a rolling stand from the rolling stand;

[0024] Fig. 2 is a side view of the changing device before a changing device of the changing device is moved into the rolling stand;

[0025] Fig. 3 is a side view of the changing device during insertion of the changing device into the rolling stand;

[0026] Fig. 4 is a side view of the changing device during the extension of support rolls of the rolling stand from the rolling stand;

[0027] Fig. 5 is a sectional view of the rolling stand with the changing device retracted into the rolling stand for changing the support rolls;

[0028] Fig. 6 is a sectional view of the changing device inserted into the rolling stand for changing the support rolls;

[0029] Fig. 7 is a detailed view of the changing device shown in Fig. 6 with an adjustment system of the changing device;

[0030] Fig. 8 is a side view of the changeover device when removing the adjustment device; Fig. 9 is a side view of the changeover device when removing the adjustment cylinder;

[0031] Fig. 10 is a side view of the changing device with the carrier of the changing device swung out and with the boom of the changing device folded in;

[0032] Fig. 11 is a side view of the changing device with the carrier swung out and the boom unfolded;

[0033] Fig. 12 a view of the changing device from the side when removing the adjusting device or the adjusting cylinder.

[0034] 1 to 12 shows a changing device 10 for changing work rolls 11, 12 and backup rolls 13, 14 of a rolling stand 15. The rolling stand 15 comprises a housing 16 and an upper backup roll 13 and a lower backup roll 14, which are arranged on the housing 16 via chocks 17 of the upper backup roll 13 and chocks 18 of the lower backup roll 14. The rolling stand 15 further comprises an upper work roll 11 and a lower work roll 12, which, as shown in Fig. 1, after their removal, are pulled out of the rolling stand 15 by means of a displacement device 19 of the changing device 10 along an arrow direction 20 via extension rails 21 of the rolling stand 15.The displacement device 19 comprises a roll changing carriage 22 and a locomotive 24 arranged on the rails 23 of the roll changing carriage 22, which locomotive is mechanically coupled to the work rolls 11, 12 for extending the work rolls 11, 12 from the rolling stand 15. The locomotive 24 comprises a drive motor 25 designed as a geared motor with a holding brake (not shown here). The work rolls 11, 12, which are extended from the rolling stand 15 onto the roll changing carriage 22 by means of the locomotive 24 via the extension rails 21 and the rails 23 connected to the extension rails 21, are lifted from the roll changing carriage 22 and removed from it by means of an overhead crane (not shown here). Subsequently, as shown in Fig. 2, a changing device 26 of the changing device 10 is arranged on the rails 23 of the roll changing carriage 22.The changing device 26 comprises two block-shaped support parts 27, 28 and a connecting part 29 connecting the support parts 27, 28 to one another, wherein insertion means 30 of the changing device 26, each designed as running wheels 52, are arranged on the support parts 27, 28. Thereafter, the changing device 26 is retracted, as shown in Fig. 3, by means of the locomotive 24, which is now mechanically coupled to the changing device 26, by pushing it along an arrow direction 31 into the rolling stand 15, so that the support parts 27, 28 are each arranged between a chock 17 of the upper support roll 13 and a chock 18 of the lower support roll 14 between the support rolls 13, 14. The changing device 26 is moved into the rolling stand 15 via the rails 23 and the extension rails 21 connected to the rails 23.When the changing device 26 is moved into the rolling stand 15, the entry means 30, which are in an engagement position of the entry means 30, are in engagement with the extension rails 21. After the changing device 26 has been moved into the rolling stand 15, the upper support roll 13 is lowered onto the changing device 26 or an upper side 32, 33 of the changing device 26, as can be seen in particular from Figs. 5 to 7, wherein the entry means 30 are adjusted from the engagement position into a non-engagement position of the entry means 30, in which the entry means 30 are no longer in engagement with the extension rails 21, as a result of the lowering by means of a mechanically actuated adjustment system 34 of the changing device 26, which will be described in more detail later in connection with Fig. 7. The entry means 30 lift off the exit rails 21, forming a gap 35. After lowering the upper support roller 13 orWhen the insertion means 30 are moved into the non-engaged position, the changing device 26 or a lower side 36, 37 of the changing device 26 rests on the lower support roller 14 or the chocks 18 of the lower support roller 14. Specifically, the changing device 26 rests with a respective lower side 36, 37 of the support parts 27, 28 on the chocks 18 of the lower support roller 14, wherein the chocks 17 of the upper support roller 13 rest on a respective upper side 32, 33 of the support parts 27, 28, wherein the chocks 17 of the upper support roller 13 each engage in a pressure plate 38 formed on the upper side 32, 33 of the support parts 27, 28. After lowering the upper support roller 13 or adjusting the insertion means 30 into the non-engagement position, the upper support roller 13 is positively centered on the lower support roller 14 via the changing device 26.Since the insertion means 30 then do not contact the exit rail 21, a weight load of the upper support roller 13 acts via the changing device 26 not on the exit rails 21, but directly on the lower support roller 14 or the chocks 18 of the lower support roller 14. Thereafter, as shown in Fig. 4, the lower support roller 14 is extended from the rolling stand 15 together with the upper support roller 13, which is supported on the lower support roller 14 via the changing device 26. The extension is achieved by pulling by means of the roll changing carriage 22 on the locomotive 24, which is fixed relative to the roll changing carriage 22 by means of the holding brake and is mechanically coupled to the changing device 26.

[0035] Fig. 7 shows, in particular, an adjustment system 34 arranged in the support parts 27, 28, of which only a part arranged in the support part 27 is visible here. Two retraction means 30 designed as running wheels 52 are arranged on each support part 27, 28, wherein the respective two retraction means 30 are arranged opposite one another, laterally on the respective support part 27, 28. The respective two retraction means 30 have their own axis and are therefore rotatable independently of one another. The adjustment system 34 comprises, for each insertion means 30, a first piston 40 which is spring-mounted by means of a compression spring 39 of the adjustment system 34 and which can be actuated as a result of the lowering of the upper support roller 13 onto the changing device 26, and a second piston 41 which can be moved in the opposite direction to the first piston 40 and on which the respective insertion means 30 is arranged. For transmitting an adjusting movement of the first piston 40 to the second piston 41 orThe retraction means 30 couples the first piston 40 to the second piston 41 via a lever element 42 of the adjustment system 34 mounted at a pivot point 55. By means of the upper support roller 13 or the chocks 17 of the upper support roller 13, the pressure plate 38 of the adjustment system 34, which is connected to the first piston 40, can be pressed onto the changing device 26 or onto the upper side 32, 33 of the support parts 27, 28 when the latter are lowered. A positive fit exists between the chocks 17 of the upper support roller 13 and the upper side 32, 33 of the support parts 27, 28. The pressure plate 38 has a clearance.

[0036] A summary of Figures 8 to 12 shows that the changing device 10 or changing mechanism 26 can also be used to change or remove an adjustment device 44 of the rolling stand 15 and an adjustment cylinder 45 of the rolling stand 15. For this purpose, the changing mechanism 26 has a support 48 which can be pivoted by means of a hydraulic cylinder 46 of the changing device 26, which can be actuated by means of a hand pump 47 of the changing device 26, and a foldable boom 49 arranged at the end of the support 48, wherein the boom 49 has a storage plate 50 for depositing the adjustment device 44 and the boom 49 is further designed to accommodate a lifting system 51, which in the present case is designed as a chain hoist 54 with a trolley 53, for lifting the adjustment cylinder 45. The raised adjusting cylinder 45 can be placed on the support part 27. When changing or removing the adjusting device 44 orof the adjusting cylinder 45, the changing device 26 is arranged on the roll changing carriage 22, so that the adjusting device 44 placed on the support plate 50 or the adjusting cylinder 45 placed on the support part 27 can be extended from the rolling stand 15 after removal.

[0037] To equip the rolling stand 15 with new, fresh, or repaired components not shown here, i.e. backup rolls, work rolls, adjusting device, or adjusting cylinder, the process explained above can be carried out in reverse order.

Claims

Patent claims 1. Changing device (10) for changing at least backup rolls (13, 14) of a rolling stand (15), comprising a changing device (26) which can be moved into the rolling stand when the work rolls (11, 12) of the rolling stand are extended, preferably transversely to a rolling direction, wherein the changing device has insertion means (30), preferably designed as running wheels (52), which can be brought into engagement with extension rails (21) of the rolling stand provided for the work rolls, for moving the changing device into the rolling stand, wherein, when the changing device is moved into the rolling stand, the changing device can be supported on a lower backup roll (14) of the backup rolls and an upper backup roll (13) of the backup rolls can be lowered onto the changing device, such that the lower backup roll, together with the upper backup roll supported on the lower backup roll via the changing device, preferably transversely to the rolling direction, can be moved out of the Rolling stand is extendable,characterized in that the changing device is designed in such a way that the insertion means when lowering the upper support roller onto the changing device for supporting the changing device on the lower, Support roller can be adjusted from an engagement position of the retraction means, in which the retraction means are engaged with the extension rails, to a non-engagement position of the retraction means, in which the retraction means are not engaged with the extension rails.

2. Changing device according to claim 1, characterized in that the changing device (26) is designed such that the upper support roller (13) can be positively centered on the lower support roller (14) via the changing device.

3. Changing device according to claim 1 or 2, characterized in that the insertion means (30) for supporting an underside (36, 37) of the changing device (26) on chocks (18) of the lower support roller (14) can be lifted off the extension rails (21).

4. Changing device according to one of the preceding claims, characterized in that the changing device (26) has a preferably mechanically actuated adjustment system (34) for adjusting the retraction means (30) from the engaged position to the non-engaged position.

5. Changing device according to claim 4, characterized in that the adjusting system (34) for each insertion means (30) comprises a first piston (40), preferably spring-mounted, which can be actuated when the upper support roller (13) is lowered onto the changing device (26) and a lever element (42) cooperating with the first piston for transmitting an adjusting movement of the first piston to the respective insertion means.

6. Changing device according to claim 5, characterized in that the respective retraction means (30) is arranged on a second piston (41) of the adjustment system (34) which is movable in the opposite direction to the first piston (40), wherein the first piston is coupled to the second piston via the lever element (42) which is mounted in a pivot point (55).

7. Changing device according to one of the preceding claims, characterized in that the changing device (26) comprises two, preferably block-shaped, support parts (27, 28) and a connecting part (29) connecting the support parts to one another, wherein the insertion means (30) are arranged on the support parts.

8. Changing device according to one of the preceding claims, characterized in that the changing device (26) has a, preferably hydraulically, pivotable support (48) and a foldable boom (49) arranged, preferably at the end, on the support, wherein the boom has a storage plate (50) for depositing an adjustment device (44) of the rolling stand (15) and / or the boom is designed for arranging a lifting system (51), in particular a chain hoist (54) with a trolley (53), for lifting an adjustment cylinder (45) of the rolling stand.

9. Changing device according to one of the preceding claims, characterized in that the changing device (26) comprises a displacement device (19) which is used to extend the work rolls (11, 12) from the rolling stand (15) and / or to retract the changing device (26) into the rolling stand and / or for extending the support rolls (13, 14) from the rolling stand.

10. Changing device according to claim 9, characterized in that the shifting device (19) comprises a roll changing carriage (22) and a locomotive (24) arranged on the roll changing carriage, which can be mechanically coupled to the working rolls (11, 12) and / or the changing device (26).

11. Changing device according to claim 10, characterized in that the changing device (26) can be arranged on rails (23) of the roller changing carriage (22).

12. Changing device according to claim 10 or 11, characterized in that the locomotive (24) comprises a drive motor (25), preferably a geared motor, with a holding brake.

13. Method for changing at least backup rolls (13, 14) of a rolling stand (15) by means of a changing device (10), wherein, when the work rolls (11, 12) of the rolling stand are extended, a changing device (26) of the changing device is moved into the rolling stand, preferably transversely to a rolling direction, wherein the changing device has insertion means (30), preferably designed as running wheels, which, for moving the changing device into the rolling stand, are brought into engagement with extension rails (21) of the rolling stand provided for the work rolls, wherein, when the changing device is moved into the rolling stand, the changing device is supported on a lower backup roll (14) of the backup rolls and an upper backup roll (13) of the backup rolls is moved onto the Changing device is lowered, wherein the lower support roll is extended out of the rolling stand together with the upper support roll supported on the lower support roll via the changing device, preferably transversely to the rolling direction, characterized in that the insertion means are adjusted when the upper support roll is lowered onto the changing device for supporting the changing device on the lower support roll from an engagement position of the insertion means, in which the insertion means are in engagement with the extension rails, into a non-engagement position of the insertion means, in which the insertion means are not in engagement with the extension rails.

14. Method according to claim 13, characterized in that before changing the support rolls (13, 14) the working rolls (11, 12) are moved out of the rolling stand (15).

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