EP2121210B1 - Roll stand - Google Patents

Abstract

The invention relates to a roll stand (1) with a number of rollers (2, 3) and with an incoming guide (4) and/or an outgoing guide (5) which is/are fixed on the roll stand (1) before or after the rolling gap (6) in the rolling direction (W), respectively, and which is/are adjustably arranged in the direction perpendicular to the axis (7) of the rollers (2, 3) and perpendicular to the rolling direction (W), particularly in the vertical direction (V). To minimize damage in case of an accident, the invention provides for a predetermined breaking point (9) in the fixing means which fixes the incoming guide (4) and/or the outgoing guide (5) on the roll stand (1).

Description

The invention relates to a roll stand with a number of rolls and with an inlet guide and / or a discharge guide, which is mounted in the rolling direction in front of or behind the nip on the roll stand and are in the direction perpendicular to the axis of the rolls and perpendicular to the rolling direction, in particular in the vertical direction, is arranged adjustable or are, wherein the inlet guide and / or the outlet guide on the rolling mill defining fasteners have a predetermined breaking point and wherein the fastening means comprise at least one expansion screw.

Such a rolling mill is from the DE 21 29 337 41 known. A similar solution shows the DE 16 02 172 A1 ,

The DE 101 16 988 A1 discloses a rolling stand with means for raising or lowering the intermediate roll or trolley rails during roll change. The roller rails are arranged on a guide, along which they can be moved in the vertical direction. A similar solution is from the DE 1 940 414 A1 known.

The on rolling stands arranged inlet and outlet guides, which are arranged adjustable on the frame in the vertical direction, must absorb operating forces in the horizontal direction. This is due to the purpose of the guides to guide the material to be rolled into the nip. For this purpose, the inlet and outlet guides on an aligned at an acute angle to the rolling direction guide surface.

It has turned out that there may be major damage if it comes during operation of the rolling mill to an accident, ie if a slab, a sheet or a belt is not taking the right path and abuts the inlet and outlet guide. Then it can cause significant damage come through that the impact forces are transmitted from the inlet and outlet guide on the rolling stand. In particular, the guide surfaces for the inlet and outlet guides on the rolling stand or on the corresponding surrounding components can be damaged.

The invention is therefore the object of developing a generic rolling stand so that the degree of damage is reduced in case of accident. This is to ensure that in an undesirable collision of the rolling stock with the inlet and outlet guides, no significant damage occurs.

The solution of this object by the invention is characterized in that the fastening means comprise at least two retaining strips extending in the direction perpendicular to the axis of the rolls and perpendicular to the rolling direction, in particular in the vertical direction, and which penetrates from the at least one expansion screw and from this are tense.

The predetermined breaking point can be formed as introduced into the expansion screw constriction. The axis of the at least one expansion screw preferably has in the rolling direction.

It can further be provided that at least two of the retaining strips seen in the rolling direction abut bearing surfaces of a support member which is fixedly disposed on the rolling stand. Furthermore, it is advantageous if between two retaining strips, a third retaining strip is arranged, which holds the two retaining strips at a distance.

Between the retaining strips and the support element bearing elements can be arranged; These are advantageously designed as sliding bearing elements.

For attachment of the inlet and outlet guide on the one or more retaining strips provides a development of the invention that the connection between the or outlet guide and at least one of the retaining strips via a feather, which extends partially in the retaining strip and partially in the inlet and outlet guide in the direction perpendicular to the axis of the rolls and perpendicular to the rolling direction, in particular in the vertical direction.

According to the invention, it is therefore provided that specific measures are taken to reduce the damage potential in the event of an accident. The inlet and outlet guides take in the embodiment of the invention in a collision no undue damage. As a result, in particular longer downtimes of the rolling mill can be avoided, as they are typical today in the accident. Furthermore, the collision-related repair costs are significantly reduced.

Therefore, in the event of an accident, there is an improved and faster way to restore the rolling mill; the economic resources needed to repair the damage are much lower than is the case with previously known solutions.

In the drawing, an embodiment of the invention is shown.

Fig. 1

den Schnitt durch ein Walzgerüst, wobei die Achsen der Walzen senkrecht auf der Zeichenebene stehen,

Fig. 2

unter Weglassung diverser Details die geschnittene Draufsicht auf das Walzgerüst und Auslaufführung gemäß dem Schnitt D-D nach Fig. 1, sowie eine Seitenansicht aus Richtung X,

Fig. 3

eine vergrößerte Darstellung der Auslaufführung im rechten Bereich der Fig. 1,

Fig. 4

den Schnitt A-A gemäß Fig. 3,

Fig. 5

den Schnitt B-B gemäß Fig. 3 und

Fig. 6

den Schnitt C-C gemäß Fig. 3.

Show it:

Fig. 1

the section through a roll stand, wherein the axes of the rolls are perpendicular to the drawing plane,

Fig. 2

omitting various details, the cut plan view of the rolling stand and outlet guide according to the section DD after Fig. 1 , as well as a side view from direction X,

Fig. 3

an enlarged view of the outlet guide in the right area of the Fig. 1 .

Fig. 4

the section AA according to Fig. 3 .

Fig. 5

the section BB according to Fig. 3 and

Fig. 6

the section CC according to Fig. 3 ,

In Fig. 1 is a rolling mill 1 to see a rolling mill, which is constructed in a widely known manner. On both sides of the center plane, the (working) rollers 2, 3 of the roll stand are shown in different vertical positions, ie with different rolling gap 6 between the rollers 2, 3. The axes 7 of the rollers 2, 3 are perpendicular to the plane. In the rolling direction W before and behind the rollers 2, 3 are in a conventional manner an inlet guide 4 and an outlet guide 5. The two guides 4, 5 can be adjusted in the direction of the vertical V.

The too Fig. 1 Corresponding top view according to the section DD after Fig. 1 is in Fig. 2 to see. Here, the outlet guide 4, 5 can be seen again and their guides on the sides to make them adjustable or movable in the direction of the vertical V.

On the rolling stand 1, a support member 16 is arranged in each case, which is formed as an elongated beam extending in the vertical direction V. On the part of the guides 4, 5, these support elements 16 are U-shaped comprising a plurality of retaining strips, which are connected to the guide 4, 5.

Construction details are in Fig. 3 to see. The outlet guide 5 is with the above in Fig. 3 Attached arrangement shown mounted on the rolling stand, wherein a displacement of the guide 5 in the vertical direction V is made possible. The determination of the outlet guide 5 on the roll stand 1 is carried out by a number of fasteners 8. These are - s. this in the synopsis, the detailed sectional views in the FIGS. 4 to 6 - In the present case as a screw connection formed, wherein the fastening means 8 comprise a screw whose axis 10 extends in the rolling direction W. As can be seen, the screw passes through three retaining strips 11, 12 and 13, which together form a U-shaped recess in which the carrier element 18 is arranged. The retaining strip 11 (s. FIGS. 4 to 6 ) rests against a bearing surface 14 of the carrier element 16. Accordingly, the holding element 12 is located on an opposite support surface 15 on the carrier element 16.

Thus, the three retaining strips 11, 12, 13 together with the support member 16 is a linear guide for the outlet guide 5 for their movement in the vertical direction V. For a smooth displacement of the outlet guide 5 in the vertical direction V are bearing elements 17 between the retaining strips 11, 12 and the support element 16 is positioned. Such bearing elements 17 are also provided between the retaining strips 11 and 12 and the roll stand 1, to ensure on all sides a low-wear storage. A fixed connection between the outlet guide 5 and the retaining strip 13 is presently produced by a feather key 18, which is arranged both in a groove in the outlet guide 5 and in a groove in the retaining strip 13 (s. FIGS. 4 and 5 ). The compound itself is made by screws, which connect the retaining strip 13 with the outlet guide 5 (s. Fig. 6 ).

By the screws provided with the reference numeral 8, the composite of retaining strips 11, 12, 13 and the support member 16 is made, and the tightening torque of the screws defines the bias of the storage.

It is essential that the inlet guide 4 and the outlet guide 5 on the rolling stand 1 fixing fastener 8 have a predetermined breaking point 9. In the present case this is carried out in that the screws are designed as expansion screws, ie have a constriction 9, which represent a weakening of the cross section of the screw shaft. If there is an accident, ie abuts a slab or the like to the inlet or outlet guide 4, 5, the shock of the accident on the expansion bolts of the guide 4, 5 transmitted to the rolling mill 1. The expansion bolts then represent predetermined breaking points, ie the bolt shank ruptures due to the impact. As a result, the form-fitting is canceled, with the guides 4, 5 are held on the rolling stand 1 in the mounted state.

By appropriate dimensioning of the constriction 9 can ensure that during normal operation, the forces on the guides 4, 5 are transmitted to the rolling mill 1, but that in the event of an accident tearing off of the screws takes place, so that it prevents the entire guide assembly and the rolling mill 1 itself is damaged by the accident.

The intended breaking points for the attachment of the inlet and outlet guide 4, 5 on the roll stand 1 are unknown in the prior art. As a result, the damage resulting from an accident is considerable. This is no longer the case with the proposed solution. In particular, a strong deformation of the guides is prevented because it comes in good time before a release of the guides from the rolling stand.

As in particular in the FIGS. 4 to 6 can be seen, the form-fitting - as viewed in the rolling direction W - between the inlet and outlet guide 4, 5 and the rolling stand 1 made on the retaining strips 11 and 12, which bear against the contact surfaces 14 and 15. Since the composite of the retaining strips 11, 12, 13 is made only on the expansion bolts, therefore, the positive connection is canceled when the screw breaks.

The other components are thus reliably protected against major consequential damage.

The retaining strips 11, 12, 13 are simple and can be manufactured inexpensively. An exchange is possible if necessary in a simple manner.

LIST OF REFERENCE NUMBERS

1

rolling mill

2

roller

3

roller

4

entry guide

5

Exit guide

6

nip

7

Axis of the rolls

8th

fastener

9

Predetermined breaking point (constriction)

10

Axle of the expansion screw

11

retaining strip

12

retaining strip

13

retaining strip

14

bearing surface

15

bearing surface

16

support element

17

bearing element

18

Adjusting spring

W

rolling direction

V

vertical

Claims (8)

1. Roll stand (1) with a plurality of rolls (2, 3) and with an entry guide (4) and/or an exit guide (5), which is or are fastened to the roll stand (1) respectively in front of and behind the rolling gap (6) in rolling direction (W) and which is or are arranged to settable in direction perpendicularly to the axis (7) of the rolls (2, 3) and perpendicularly to the rolling direction (W), particularly in vertical direction (V), wherein the fastening means (8) fixing the entry guide (4) and/or the exit guide (5) to the roll stand (1) have a frangible location (9) and wherein the fastening means (8) comprises at least one necked-down screw, characterised in that the fastening means (8) have at least two retaining strips (11, 12, 13) which extend in direction perpendicularly to the axis (7) of the rolls (2, 3) and perpendicularly to the roll direction (W), particularly in vertical direction (V), and which are penetrated by the at least one necked-down screw (8) and tightened by this.
2. Roll stand according to claim 1, characterised in that the frangible location (9) is formed as a constriction in the necked-down screw (8).
3. Roll stand according to claim 1 or 2, characterised in that the axis (10) of the at least one necked-down screw (8) points in rolling direction (W).
4. Roll stand according to any one of claims 1 to 3, characterised in that at least two of the retaining strips (11, 12) as seen in rolling direction (W) bear against support surfaces (14, 15) of a support element (16) fixedly arranged at the roll stand (1).
5. Roll stand according to any one of claims 1 to 4, characterised in that a third retaining strip (13) is arranged between the two retaining strips (11, 12) and keeps the two retaining strips (11, 12) at a spacing.
6. Roll stand according to claim 4 or 5, characterised in that bearing elements (17) are arranged between the retaining strips (11, 12, 13) and the support element (16).
7. Roll stand according to claim 6, characterised in that the bearing elements (17) are constructed as slide bearing elements.
8. Roll stand according to any one of claims 1 to 7, characterised in that the connection between the entry or exit guide (4, 5) and at least one of the retaining strips (11, 12, 13) is effected by way of a key (18) which extends partly in the retaining strip (13) and partly in the entry or exit guide (4, 5) in direction perpendicular to the axis (7) of the rolls (2, 3) and perpendicularly to the rolling direction (W), particularly in vertical direction (V).

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