EP1507606B1 - Method and device for changing pairs of working rolls and/or pairs of back-up rolls on roll stands - Google Patents

Abstract

A device for changing pairs of work rolls and/or pairs of backup rolls of roll stands, wherein the rolls are each supported in chocks and are movable out or in by a lower back up roll supported on a track and wheels. The work rolls on the drive side of the roll stand can be coupled to a hydraulic piston-cylinder actuator that is dimensioned in is stroke length for the removal or installation distance and can be uncoupled when it has been withdrawn by the required distance. A roll changing frame can be coupled to the actuator and, when the upper backup roll and the roll changing frame are supported on the lower backup roll, the pair of backup rolls can be moved out or back in. The actuator is coupled to a pusher with connecting arms aligned with ends of the rolls. The actuator is arranged on the drive side of the roll stand and is coupled to the pusher through a piston rod.

Description

The invention relates to a method and a device for changing pairs of work rolls and / or pairs of support rolls on rolling stands, in which perpendicular to the rolling direction for guided in support levels chocks a Geradschubantrieb that moves stored in the chocks pair of work rolls for removal or installation, and by a Geradschubantrieb the support roller pair supported on a roll-changing chair is extended or retracted (see JP-A-55036063, Figs. 3-5).

It is known (EP 1 136 143 A2; DE 31 23 933 C2) to perform the method with a roll changing chair for the support rollers by a separate, arranged on the operating side of the mill under Hüttenflur piston-cylinder drive, wherein the drive has a stroke length of 5,500 mm and more required. This results in a relatively complicated sequence of movements, in that after removal of the pair of work rolls with the mentioned drive only the lower support roller is extended. On this lower support roller of the roll changing chair is now placed and retracted together with the lower support roller in the rolling stand and the upper support roller must now be lowered to the roll changing chair. After this operation, the entire unit can be extended out of the upper back-up roll, the lower back-up roll, and the intermediate roll-up roll. Thereafter, in reverse order, a new set of backup rollers can be reinstalled. As a result, the lower support roller is retracted twice in the rolling mill and extended again. In addition, given the high weights, a lot of time is needed that could be used elsewhere.

The invention has for its object to save time by an altered method when changing the roll and at the same time to create the basis by a cheaper device for this.

The above object is achieved on the basis of the above-mentioned method steps according to the invention that the pair of work rolls are extended and uncoupled after coupling to the Geradschubantrieb that then coupled the same Geradschubantrieb to a retracted between the support rollers roll change chair and after supporting the roll change chair and the upper support roller on the Lower support roller extended as a unit or retracted. As a result, not only saves time because both sets of rollers once extended together and retracted once after replacement, but also to device overhead, since only a piston-cylinder drive is needed.

This single piston-cylinder drive can also be further advantageously used to the effect that the roll changing chair is pushed out of the rolling stand from the drive side of the roll stand by the Geradschubantrieb with dismantled work rolls or pulled into the rolling mill. The advantage is therefore both in a procedural as well as in a device-technical nature.

The device for the change of pairs of work rolls and / or pairs of support rollers on rolling stands, provides support rollers and work rolls in each case in raised and lowered chocks in the stator frame ahead, so that the pair of work rolls, stored in the chocks, by means of a Geradschubantriebs is extendable and the support roller pair means a supported on a guideway and wheels lower support roller and a supported on this roll changing chair with supported upper support roller or retractable.

In this case, the device according to the invention is designed to the effect that the pair of work rolls on the drive side of the rolling stand with a dimensioned for the expansion or installation path in the stroke length hydraulic piston-cylinder drive disengageable and disengaged in the Ausfahrabstand and that at an altitude between the Back-up rollers retracted roll changing chair can be coupled to the same piston-cylinder drive and after supporting the upper support roller and the roll changing chair on the lower support roller, the support roller pair is retractable or retractable. As a result, time is saved when changing the roll and the cost of device parts is significantly reduced. It is e.g. only a hydraulic piston-cylinder drive or working on another basis Geradschubantrieb required.

As a further development, it is provided that the piston-cylinder drive is articulated on a Ausschiebewagen having on the roll ends aligned connection arms. Since the rollers are provided in pairs as work rolls and as backup rolls and also the roll change chair is coupled, the connection arms form simple means to bridge a path section and to create a joint.

The Ausschiebewagen takes about the width of the mill, so the piston-cylinder drive is only to be interpreted for the pure displacement. This advantage means that the piston-cylinder drive is arranged on the drive side of the roll stand and is articulated with its piston rod on Ausschiebewagen.

The connection can be quickly created or solved by each pliers heads are arranged on the connection arms of the Ausschiebewagens, which correspond to the roll ends of the work rolls.

Such a compound is also still applicable by the connecting arms associated with the roll changing chair each shaped pieces are provided. The pliers heads can engage or disengage the fittings.

In this case, the power supply system of the mill stand can be exploited by the pliers heads are each hydraulically or electrically actuated.

Accordingly, the roll changing chair by means of existing hydraulic devices in the rolling stand on the lower support roller can be lowered or raised.

Similarly, the upper back-up roll may be hydraulically lowered or raised onto the roll-changing chair.

A further advantage is that the set of rollers from the two support rollers by means of the Ausschiebewagens from the rolling stand extendable and is interchangeable with a new set of rollers.

In the drawings, embodiments of the invention are shown and will be explained in more detail below.

Fig. 1

eine Vorderansicht in Walzrichtung auf ein komplettes Walzgerüst, für den Ausbau des Arbeitswalzenpaars,

Fig. 1A

dieselbe Ansicht wie Fig. 1 in etwas vergrößerter Darstellung,

Fig. 3

dieselbe Vorderansicht des Walzgerüstes während des Ausbaus des Stützwalzenpaares und

Fig. 4

eine etwas vergrößerte Darstellung der Fig. 3.

Show it:

Fig. 1

a front view in the rolling direction on a complete rolling stand, for the removal of the pair of work rolls,

Fig. 1A

the same view as FIG. 1 in a somewhat enlarged view,

Fig. 3

the same front view of the roll stand during the removal of the support roller pair and

Fig. 4

a somewhat enlarged view of Fig. 3rd

As the rolling stand 1, there is shown a quarto stand (Figs. 1, 1A, 2, 2A) having a pair of work rolls 2, an upper work roll 2a and a lower work roll 2b, and a backup roll pair 3 having an upper backup roll 3a and a lower backup roll 3b. The work rolls 2 a, 2 b and the backup rolls 3 a, 3 b are each rotatably mounted in chocks 4 and the chocks 4 are guided in the stator frame 5. The work rolls 2a, 2b, which are held at a distance by means of hydraulic devices 6, can be extended or retracted by means of a straight-slide drive 7, which acts on the roll ends 8.

Here, the invention (Fig. 1A) is carried out such that the Ar beitswalzenpaar 2 on the drive side 12 of the roll stand 1 is coupled with a dimensioned for the expansion or the installation path 13 in the stroke length hydraulic piston-cylinder drive 7a and in Ausfahrabstand 14 is disengaged. In the altitude 15 between the support rollers 3a, 3b (Fig. 2, 2A) of the roll changing chair 11 is indirectly coupled to the same piston-cylinder drive 7a after supporting the upper support roller 3a on the roll changing chair 11 and this, on the chocks 4 of lower support roller 3b propped up, extended by means of the piston-cylinder drive 7a as a whole unit 3a, 11, 3b and retracted after replacement with a new pair of backup rollers 3 again.

The piston-cylinder drive 7a is articulated to a Ausschiebewagen 16 with its piston rod 7b, wherein the Ausschiebewagen 16 carries the roll ends 8 associated terminal arms 17a, 17b, which form a hollow angle between them. At the connection arms 17a, 17b of the Ausschiebewagens 16 each pliers heads 18 are arranged. The pliers heads 18 are hydraulically or electrically actuated.

Analogous to these pliers heads 18 each form pieces 19 are provided on the roll changing chair 11, which also cooperate with the pliers heads 18. The pliers heads 18 are hydraulically actuated together with other adjusting means in the roll stand.

The roll changing chair 11 can be lowered by means of hydraulic devices 6 in the rolling stand 1 on the lower support roller 3b.

The upper back-up roll 3a is accordingly received by the roll-changing chair 11.

The set of rollers, consisting of the two support rollers 3a, 3b and the Walzenwechselätuht 11 (Fig. 2, 2A) can be extended via the Ausschiebewagen 16 and replaced with a new set of rollers.

The procedure for roll change depends in a first step on the fact that the pair of work rolls 2a, 2b extended after coupling to the Geradschubantrieb 7 and is decoupled again. In a second step, then the same Geradschubantrieb 7 is coupled to the retracted between the support rollers 3a, 3b roll changing chair 11 and after supporting the roll changing chair 11 and the upper support roller 3a on the lower support roller 3b, the unit is extended or retracted after replacing a new unit. In this case, the roll changing chair 11 is pushed out of the rolling stand 1 from the drive side 12 of the roll stand 1 by the Geradschubantrieb 7 with removed work rolls 2a, 2b or drawn into the roll stand 1 (Fig. 2, 2A).

LIST OF REFERENCE NUMBERS

1

rolling mill

2

Pair of work rolls

2a

upper stripper

2 B

lower stripper

3

Pair of backup rolls

3a

upper support roller

3b

lower support roller

4

chocks

5

Uprights

6

hydraulic device

7

linear actuator

7a

Piston-cylinder drive

7b

piston rod

8th

roll end

9

guideway

10

wheel pairs

11

Roll changing frame

12

driving side

13

Built-in way

14

Ausfahrabstand

15

altitude

16

Ausschiebewagen

17a

Connection arm

17b

Connection arm

18

pliers head

19

fitting

Claims (11)

1. Method for exchanging working roll pairs (2) and/or backing roll pairs (3) at roll stands, in which - for the chocks guided in support planes - a slider drive moves, perpendicularly to the rolling direction, the working roll pair (2), which is mounted in the chocks, for demounting or for installation and the backing roll pair (3), which is supported on a roll change chair, is moved out or in by a slider drive, characterised in that the working roll pair (2) after coupling to the slider drive is moved out and decoupled, that thereafter the same slider drive is coupled to a roll change chair (11) moved in between the backing rolls and after supporting of the roll change chair and the upper backing roll (3a) on the lower backing roll (3b) is moved out or moved in again as a unit.
2. Method according to claim 1, characterised in that the roll change chair is pushed out of the roll stand from the drive side of the roll stand by the slider drive when the working rolls are demounted or is pulled back into the roll stand.
3. Device for changing working roll pairs (2) and/or backing roll pairs (3) at roll stands, wherein the backing rolls and the working rolls are respectively guided in raisable or lowerable chocks in the housing frame, the working roll pair is movable out, supported on the chocks, by means of a slider drive and the backing roll pair is movable in and out by means of a lower backing roll, which is supported on a guide track and wheels, and a roll change chair (11) supported thereon with supported upper backing roll, characterised in that the working roll pair (2) on the drive side (12) of the roll stand (1) can be coupled with a hydraulic piston-cylinder drive (7a) dimensioned in stroke length for the demounting or installing travel (13) and can be decoupled in the moved-out spacing (14) and that a roll change chair (11), which is moved in in the height position (15) between the backing rolls (3a, 3b), can be coupled to the same piston-cylinder drive (7a) and after supporting of the upper backing roll (3a) and the roll change chair (11) on the lower backing roll (3b) the backing roll pair (3) can be moved out or moved in again.
4. Device according to claim 3, characterised in that the piston-cylinder drive (7a) is articulated to a displacing carriage (16) which has connecting arms (17a, 17b) oriented towards the roll ends (8).
5. Device according to claim 4, characterised in that the piston-cylinder drive (7a) is arranged on the drive side (12) of the roll stand (1) and is articulated by its piston rod (7b) to the displacing carriage (16).
6. Device according to claim 4, characterised in that respective tongs heads (18) are arranged at the connecting arms (17a, 17b) of the displacing carriage (16) and correspond with the roll ends (8) of the working rolls (2a, 2b).
7. Device according to claim 4 or 5, characterised in that respective shaped members (19) associated with the connecting arms (17a, 17b) are provided at the roll change chair (11).
8. Device according to claim 6 or 7, characterised in that the tongs heads (18) are each hydraulically or electrically actuable.
9. Device according to one of claims 3 to 8, characterised in that the roll change chair (11) is lowerable or raisable on the lower backing roll (3b) by means of hydraulic devices (6) present in the roll stand (1).
10. Device according to one of claims 3 to 9, characterised in that the upper backing roll (3a) is hydraulically lowerable or raisable on the roll change chair (11).
11. Device according to one of claims 4 to 10, characterised in that the roll set is movable out of the roll stand (1) from the two backing rolls (3a, 3b) by means of the displacing carriage (16) and is exchangeable for a new roll set.

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