DE2609796A1 - Four high mill for hot rolling wide strip - is fitted with equipment for rapid changing of heavy work rolls - Google Patents

Abstract

The lower back-up roll and its chocks are mounted on slides, and form part of the equipment used to change rolls. To change rolls, they are moved on a further roll and the slides in a direction, at 90 degrees to the rolling direction, to an intermediate changing station. A trolley hoist lifts the rolls off the other roll and lays them on a track which is parallel with the rolling direction and the rolls are moved along the track. Another pair of rolls can then be moved by the trolley hoist onto the further roll, which is returned in a direction at 90 degrees to rolling to the mill. The work rolls complete with their chocks can weight more than 50 tonnes, but can still be rapidly and easily changed.

Description

Roll stand and work roll changing system

The invention relates to a roll stand, namely a four-high roll stand, esp. a roughing stand for a hot strip mill, with a roll stand, with lower and upper back-up roll chocks and back-up rolls stored therein, with lower and upper work roll chocks and work rolls mounted therein, with roller adjustment devices and with roller relief or roller balancing devices, in which the lower backup roll chocks on a perpendicular to the rolling direction from the roll stand movable back-up roll slide together with the lower one Back-up roll can be moved out of the roll stand, and a work roll changing system assigned to the roll stand, with a removal and installation device working perpendicular to the rolling direction and with a roller support that can be displaced in the rolling direction.

In four-high roll stands, it is relatively common to change the work rolls necessary. In order to reduce the associated downtimes, is already a variety of very different measures have been taken.

In the four-high roll stands in question, the upper backup roll chocks are used through the roller relief or. Roll balancing devices up against the roller adjusting devices pressed, the roller adjusting devices mostly from a pressure spindle, a thrust bearing for the pressure spindle, a pressure nut and a spindle drive. To replace the work rolls, the upper backup roll chocks are brought into an upper dead position. To for that Bringing the upper back-up chocks into an upper dead position, not the pressure spindles to have to adjust accordingly - the height adjustment speed of the pressure spindle is usually very small, because fractions of a millimeter can be set precisely during operation are - are in the four-high roll stands in question between the roll adjustment devices corresponding track bearings and the upper back-up roll chocks are provided with filler pieces, before moving the upper backup roll chocks into an upper dead position are removable so that the upper backup roll chocks in very can be brought into an upper dead position for a short time (see DT-ASs 12 15 096 and 17 52 817 as well as the DT-OS 23 43 306).

The goal of reducing the downtime associated with changing the work rolls To reduce the number of Ouarto roll stands, the one described at the beginning also serves the purpose Work roll changing system assigned to the four-high roll stand (cf.

the DT-ASs 16 02 084, 19 13 771 and 23 19 729 as well as the DT-OSs 23 21 279 and 23 43 306). All known work roll changing systems, the four-high roll stands are assigned, has in common that it is in the removal and installation devices are special units with which the work rolls to be replaced, in the work roll chocks mounted on the free roll journals, d. H. to the Roll journals not used for the drive, taken, pulled out of the roll stand and then placed on the roller tray. The one-sided gripping of the two Work rolls mounted in the work roll chocks is then practically non-existent more possible when the work rolls are very large and consequently very heavy as it is used, for example, in the roughing stands of hot strip mills where the weight of the two is stored in the work roll chocks Work rolls, including work roll chocks, are 50 t and more can.

The invention is therefore based on the object of a four-high roll stand and to specify an assigned work roll changing system, which also then can be realized if the work roll chocks and those stored therein Work rolls are particularly large and heavy.

According to the invention is to solve the above problem a Roll stand, namely a four-high roll stand, and the work roll changing system assigned to the roll stand initially and essentially characterized in that the from the support roller carriage, the lower back-up roll chocks and the lower back-up roll existing, movable Back-up roll unit as a removal and installation device for the work roll changing system is executed, - with "as a removal and installation device of the work roll changing system executed "not only the use of this backup roller unit as training and Installation device of a work roll changing system but rather an adaptation of the backup roller unit to the additional function of a removal and installation device a work roll changing system is meant. In any case, as part of the Invention when changing work rolls, the work roll chocks and those therein stored work rolls to be exchanged with the help of the previously described backup roll unit moved out of the roll stand and then other work roll chocks with new (i.e. also reconditioned) work rolls stored therein back into the roll stand retracted.

In particular, there are various ways of teaching the invention to design and develop, which are explained in the following only by way of example target.

According to a further teaching of the invention, which is of particular importance, are in a roll stand in which in the roll stand (for the backup roll change) hydraulically actuated cylinder-piston assemblies and through this cylinder-piston assemblies raisable and lowerable rail pieces are provided in the lower backup roll chocks Lifting rods guided by the one hand through the cylinder-piston arrangements which the rail pieces can be raised and lowered, z. B. indirectly via the support roller carriage, can be raised and lowered and with which, on the other hand, the lower work roll chocks can be raised and lowered.

It is recommended, as per se z. B. from DT-AS 21 31 882 known between the lower work roll chocks and the upper work roll chocks Provide support devices through which - for the work roll change - a constant distance between the centers of the lower work roll and the upper one Work roll adjusts.

In the roll stand described so far, with the one described so far Work roll changing system those stored in the work roll chocks alternating work rolls are moved out of the roll stand and can Work roll chocks with new work rolls stored therein back into the Roll stand retracted will. About it, like the one on the back-up roller unit stored work roll chocks driven out of the roll stand the work rolls stored therein against work roll chocks with new work rolls can be exchanged, nothing has been said. To that extent, after another Teaching of the invention, which is of particular importance, a preferred embodiment the work roll changing system characterized by a work roll lifting and Transport trolley, which is designed so that with it that from the lower work roll chocks, the lower work roll, the upper work roll chocks, and the upper Work roll existing work roll unit from the removal and installation device the work roll changing system - as such, it is from the back-up roll carriage, the lower back-up roll chocks and the lower back-up roll existing, movable Back-up roll unit executed - lifted, move perpendicular to the rolling direction and can be placed on the roller tray. Preferably, the work roll stroke and Transport trolley made of two support frames provided at the front and open at the bottom and made of the cross struts connecting the two supporting frames. Around the work roll lifting and transport trolley To be able to move in a simple manner perpendicular to the rolling direction, it recommends to equip it with preferably four wheels.

In addition, the work roll lifting and transport trolley can be used as it were be self-sufficient, namely its own Hydraulic station as well have a hydraulically operated lifting device and a hydraulic drive. In particular, it is advisable to have a lifting device in the area of each support frame to provide each lifting device from a double-acting cylinder-piston arrangement, from two two-armed pivotable lifting levers linked to the cylinder-piston arrangement and to build from two lift arms articulated to the lift levers and the lift arms on to provide their free ends with a lifting hook, -which then the lifting hook can reach under the lower work roll chocks.

In principle, the previously described work roll lifting and Transport trolleys can be moved on the hut corridor.

According to a further teaching of the invention, however, is in front of the roll stand at the level of the hut corridor a pair of runways are provided which are perpendicular to the Rolling direction and extend at a distance from each other which is greater than that Width of the back-up roll carriage, the lower back-up roll chocks and the lower backup roll existing backup roll aggregate; on these rails the work roll lifting and transport trolley can then be moved. In detail can the running rails are at least partially arranged on removable rail supports be.

According to a further teaching of the invention is laterally next to the roll stand - Seen from the roll stand behind the excavation pit used to change the backup rolls - as a roller tray a sliding plate is provided. The one executed in this way The roller tray is preferably mounted on two roller conveyors, i.e. not itself provided with running wheels, and with the help of a hydraulically operated cylinder-piston arrangement movable.

In the following the invention is based on only one embodiment Illustrative drawing explained in more detail; It shows: FIG. 1 a view of a rolling stand according to the invention and a work roll changing system according to the invention, seen in the rolling direction, FIG. 2 in an enlarged illustration compared to FIG. 1, a section through the object according to FIG. 1 along the line II-II, FIG. 3 again in an enlarged view compared to FIG. 1, a section through the object according to Fig. 1 along the line III - III, Fig. 4 is a plan view of the object 1 and 5 in a representation greatly enlarged compared to FIG. 1, a Section through the object according to FIG. 1 along the line V - V.

FIGS. 1-4 show a roll stand 1, namely a four-high roll stand as a roughing stand for a hot strip mill, and one assigned to the rolling stand 1 Work roll interchangeable layer 2. The roll stand 1 includes an only partially illustrated one Roll stand 3, two lower backup roll chocks 4, one in the lower backup roll chocks 4 mounted lower backup roll 5, two upper backup roll chocks 6, one in the upper support roller chocks 6 mounted upper support roller 7, two lower ones Work roll chocks 8, one in the lower work roll chocks 8 mounted lower work roll 9, two upper work roll chocks 10, one upper work roll 11, two supported in the upper work roll chocks 10 in Fig. 1 only indicated roller adjusting devices 12 and (not shown) Roll relief or roll balancing devices. The lower backup roll chocks 4 are movable on a perpendicular to the rolling direction from the roll stand 3 Support roll carriage 13 together with the lower support roll 5 from the roll stand 3 can be moved out. To the work roll changing system assigned to the roll stand 1 2 include a removal and installation device that works perpendicular to the rolling direction 14 and a roll support 15 that can be displaced in the rolling direction.

As in particular. FIG. 1 shows, this is from the back-up roller carriage 13, the lower backup roll chocks 4 and the lower backup roll 5, movable back-up roll unit as removal and installation device 14 of the work roll changing system 2 executed.

In the illustrated embodiment, in which the roll stand 3 (for the backup roll change) hydraulically operated cylinder-piston assemblies 16 and Rail sections 17 which can be raised and lowered by the cylinder-piston assemblies 16 are provided are, as shown in detail in FIG. 5, in the lower backup roll chocks 4 lifting rods 18 guided, on the one hand by the cylinder-piston assemblies 16, through which the rail pieces 17 can be raised and lowered, indirectly via the support roller carriage 13 can be raised and lowered and with which, on the other hand, the lower work roll chocks 8 can be raised and lowered. The left part of Fig. 5 shows in relation to the previous one described lifting rods 18 the working position, the right part of Fig. 5 the Change position. In addition, FIG. 5 in particular shows that between the lower work roll chocks 8 and the upper work roll chocks 10 support devices 19 are provided are, through which -for the work roll change and the work roll change -a constant distance between the centers 20 and 21 of the lower work roll 9 and the upper work roll 11 is set.

In the illustrated embodiment, it belongs to the work roll changing system a work roll lifting and transport carriage 22, which is designed so that with him that from the lower work roll chocks 8, the lower work roll 9, the upper work roll chocks 10 and the upper work roll 11 existing Work roll Unit lifted from the removal and installation device 14, Traverse perpendicular to the rolling direction and be placed on the roller tray 15 can. The work roll lifting and transport carriage 22 consists, as in particular. Fig. 1 shows, from two support frames 23, which are provided at the end and open at the bottom, and from the two Cross struts 24 connecting the supporting frame 23 and is provided with four running wheels 25. In addition, the work roll lifting and transport carriage 22 is, as it were, self-sufficient, has namely the work roll lifting and transport carriage 22 has its own hydraulic station 26 and a hydraulically operated lifting device 27 and a hydraulic drive 28 on; the hydraulic station 26 is the required energy in the form of electrical Energy supplied via a trailing cable, not shown.

In detail, the work roll lifting and transport carriage 22 a lifting device 27 is provided in the area of each support frame 23 each lifting device 27 consists of a double-acting cylinder-piston arrangement 29, made of two pivotable two-armed units articulated to the cylinder-piston assembly 29 Lifting levers 30 and two lifting arms 31 articulated to the lifting levers 30, the Lifting arms 31 each have a lifting hook 33 at their free ends 32, which then can reach under the lower work roll chocks 8.

In principle, the previously described work roll lifting and Transport trolley 22 can be moved on the hut floor 34. In the illustrated embodiment but it is in front of the roll stand 1 at the level of the hut hallway 34 Pair of running rails 35 are provided, which are perpendicular to the rolling direction and in one Run distance from each other, which is greater than the width of the slide from the support rollers 13, the lower backup roll chocks 4 and the lower backup roll 5 Back-up roller unit. The running rails 35 are partially on removable rail supports 36 arranged.

Finally, in the illustrated embodiment, it is next to the side the roll stand 1 - seen from the roll stand 1 behind the backup roll change Serving excavation pit 37 - a sliding plate is provided as a roller tray 15. The roller tray 15 is mounted on two roller tracks 38 and hydraulically with the aid of one actuatable cylinder-piston arrangement 39 displaceable. As already stated, the running rails 35 are partially arranged on removable rail supports 36, namely in the area of the excavation pit 37. In addition, there are also running rails 35 is provided on the roller tray 15.

In the roll stand 1 shown in the figures, a work roll change takes place with the help of the illustrated work 1 roll changing system 2 as follows: First the upper back-up roll chocks 6 and the upper back-up roll mounted therein 7 moved up with the help of the roller adjusting devices 12 and locked there. the between the lower work roll chocks 8 and the upper work roll chocks Supports 19 provided in 10 raise the upper work roll chocks 10 and the upper work roll 11 mounted therein and set between the Centers 20 and 21 of the lower work roll 9 and the upper work roll 11 one constant distance.

The lifting devices provided in the roll stand 3 for changing the backup rolls and lowerable rail sections 17 are with the help of the associated cylinder-piston arrangements 16 raised. The lifting rods guided in the lower backup roll chocks 4 18 are lifted by lifting the rail sections 17 and raise the lower ones Work roll chocks 8, the lower work roll 9 stored therein, the upper Work roll chocks 10 and the upper work roll 11 mounted therein from the lower back-up roll chocks 4 or from the lower back-up roll 5.

The drive spindles (not shown) are in this position of the work rolls 9, 11 by a hydraulically actuated one, also not shown Spindle chair locked.

This measure can work rolls 9, 11 with different Diameters can be interchanged without changing the position of the drive spindles beforehand to change. Axial locks, not shown, of the support rollers 5, 7 and the work rolls 9, 11 are retracted.

Now with the help of the support roller carriage 13, the lower Back-up roll chocks 4 and the lower back-up roll 5 existing back-up roll unit, which is designed as a removal and installation device 14 of the work roll changing system 2 is, the lower work roll chocks 8 with the lower work roll mounted therein 9 and the upper work roll chocks 10 with the upper work roll mounted therein 11 moved out of the roll stand 3.

After, as previously described, the lower work roll chocks 8 with the lower work roll 9 stored therein and the upper work roll chocks 10 moved out of the roll stand 3 with the upper work roll 11 stored therein have been, this work roll unit with the help of the work roll lifting and transport carriage 22 raised, move perpendicular to the rolling direction, namely in the direction of the roller tray 15, and deposited on the roller tray 15. To when the work roll unit is set down on the roll tray 15, the work roll hub is and trolley 22 in its starting position - above the backup roller unit - pulled back.

On the roller tray 15 designed as a sliding plate is in front At the beginning of the work roll change, the new work roll unit has already been put down and been prepared.

After, as previously described, the old work roll unit on the roller tray 15 has been deposited, the roller tray 15 with the two deposited on it Work roll units with the aid of the cylinder-piston arrangement 39 shifted so far that the new work roll unit is in one position is located, from which it is lifted with the work roll lifting and transport carriage 22 can be.

Is the roller tray 15 in the correct position explained above position, the work roll lifting and transport carriage 22 is moved again, until it is above the new work roll unit.

The new work roll unit is then lifted with the help of the work roll lifting and transport carriage 22 is lifted from the roller tray 15 until it is in the excavation pit 37 standing backup roll unit, which is used as a removal and installation device 14 of the work roll changing system 2 is executed, proceed and placed on the removal and installation device 14.

The backup roller unit designed as a removal and installation device 14 is now used with the work roll assembly located on it moved into the roll stand 3.

The locking of the drive spindles of the work rolls 9 and 11 is solved. The rail pieces 17 are lowered.

The axial locks of the work rolls 9, 11 and the lower Back-up roll 5 are closed. The upper back-up roll 7 is with the help of the roll adjusting devices 12 employed. The roller balancing devices will switched on.

Compared to the previously described embodiment of the roll stand 1 and the work roll changing system 2, various changes are also possible, without departing from the teaching of the invention, e.g. B. the following: If there is space before allows the roll stand 1, the rails 35 can over the roll tray 15 also be extended, namely by a little more than for setting down a work roll unit is needed. Then the work roll lifting and transport carriage 22 with the removed Work roll unit via the roll support 15 designed as a sliding plate be moved out and the removed work roll unit can be set down there will. While the old work roll unit is being set down, it can be used as a sliding plate trained roll storage can be moved with a new work roll unit in such a way that that after the old work roll unit has been set down, the work roll lifting and transport carriage 22, as it were, the new work roll unit on the return journey can take away.

Finally, it is even possible without a sliding roller tray 15 get by, namely when the work roll lifting and transport carriage 22 is designed so that it has one work roll unit over another work roll unit can lift.

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Claims (16)

Claims: L) i. Roll stand, namely four-high roll stand, esp. Roughing stand for a hot strip mill, with a roll stand, with lower and upper back-up roll chocks and back-up rolls stored therein, with lower and Upper work roll chocks and work rolls stored therein, with roll adjustment devices and with roller relief resp. Roll balancing devices in which the lower backup roll chocks on a support roller carriage that can be moved out of the roller stand perpendicular to the direction of rolling can be moved out of the roll stand together with the lower back-up roll, and the roll stand associated with the work roll changing system, with a perpendicular to the Rolling direction working removal and installation device and preferably with an in Rolling direction displaceable roll storage, d u r g e k e n n z e i c h n e t that from the back-up roll carriage (13), the lower back-up roll chocks (4) and the lower support roller (5) existing, movable support roller unit designed as a removal and installation device (14) for the work roll changing system (2) is. 2. Roll stand and work roll changing system according to claim 1, wherein Hydraulically operated cylinder-piston arrangements in the roll stand (for changing the backup rolls) and rail sections that can be raised and lowered by these cylinder-piston assemblies are provided, characterized in that in the lower backup roll chocks (4) lifting rods (18) are guided, on the one hand by the cylinder-piston arrangements (16) through which the rail pieces (17) can be raised and lowered, e.g. B. indirectly via the back-up roller carriage (13) can be raised and lowered and with those on the other hand the lower work roll chocks (8) can be raised and lowered. 3. Roll stand and work roll changing system according to claim 1 or 2, characterized in that as known per se, between the lower work roll chocks (8) and the upper work roll chocks (10) support devices (19) are provided are, through which - for the work roll change - a constant distance between the centers (20 and 21) of the lower work roll (9) and the upper work roll (11) sets. 4. Roll stand and work roll changing system according to one of the claims 1 to 3, characterized by an Arbetswalzen lifting and transport carriage (22), the is designed so that with it that from the lower work roll chocks (8), the lower work roll (9), the upper work roll chocks (10) and the upper work roll (11) existing work roll unit from the removal and installation device (14) lifted off the work roll changing system (2), move perpendicular to the rolling direction and can be placed on the roller tray (15). 5. Roll stand and work roll changing system according to claim 4, characterized characterized in that the work roll lifting and transport carriage (22) consists of two end faces provided support frame (23) open at the bottom and connecting the two support frames (23) Cross struts (24) consists. 6. Roll stand and work roll changing system according to claim 4 or 5, characterized in that the work roll lifting and transport carriage (22) with preferably four wheels (25) is provided. 7. Roll stand and work roll changing system according to one of the claims 4 to 6, characterized in that the work roll lifting and transport carriage (22) its own hydraulic station (26) and a hydraulically operated lifting device (27) and a hydraulic drive (28). 8. Roll stand and work roll changing system according to one of the claims 5 to 7, characterized in that in the area of each support frame (23) in each case one Lifting device (27) is provided. 9. Roll stand and work roll changing system according to claim 7 or 8, characterized in that the or each lifting device (27) consists of a two-sided acting cylinder-piston arrangement (29), from two to the cylinder-piston arrangement (29) articulated two-armed pivoting lift levers (30) and off two lift arms (31) hinged to the lift lever (30). 10. Roll stand and work roll changing system according to claim 9, characterized characterized in that the lifting arms (31) each have a lifting hook at their free ends (32) (33) have. 11. Roll stand and work roll changing system according to one of the claims 4 to 10, characterized in that in front of the roll stand (1) at the level of the hut hallway (34) a pair of running rails (35) is provided which are perpendicular to the rolling direction and extend at a distance from one another which is greater than the width of the from the back-up roll carriage (13), the lower back-up roll chocks (4) and the lower backup roller (5) existing backup roller unit. 12. Roll stand and work roll changing system according to claim 11, characterized characterized in that the running rails (35) at least partially on removable Rail supports (36) are arranged. 13. Roll stand and work roll changing system according to one of the claims 1 to 12, characterized in that next to the roll stand (1) - from the roll stand (1) as seen from behind the excavation pit (37) serving to change the backup rolls - as Roller tray (15) a sliding plate is provided. 14. Roll stand and work roll changing system according to claim 13, characterized characterized in that the roller tray (15) is mounted on two roller tracks (38). 15. Roll stand and work roll changing system according to claim 13 or 14, characterized in that the roller tray (15) with the help of a hydraulic actuatable cylinder-piston arrangement (39) is displaceable. 16. Roll stand and work roll changing system according to one of the claims 11 to 15, characterized in that the running rails (35) are partially on the roller support (15) are provided.