DE10116988B4 - rolling mill - Google Patents

Abstract

The invention relates to a roll stand with means for raising and lowering the intermediate roll (4) and / or work roll rails (8) when changing rolls. For this purpose, the supporting roller balancing crossbeams (2) pulling the upper supporting roller set (1) against the auxiliary position (14) with the aid of the supporting roller balancing cylinders (3) are coupled to the upper roller rails (4, 8) by connecting rods (6, 11). The mechanical coupling is such that the roller rails (4, 8) have to be raised / lowered when lifting / lowering the support roller balancing crossbeams (2).

Description

The invention relates to a roll stand with means for raising and lowering the intermediate roll and / or work roll rails during roll change.

Previously known solutions in the technical field in question envisage that a lifting and lowering of the upper intermediate roll or work roll rails which takes place during the roll change is effected via hydraulic cylinders provided specifically for these movements.

For example, this describes DE 195 36 042 A1 a guide device for four- or multi-roll stands with work rolls and back-up rolls. The bearing chocks of the work rolls are each connected to bending blocks, which are guided by arranged in windows of the roll stand pairs of cylinder rods. The ends of the cylinder rods are connected to the rolling stand and between the superimposed bending blocks a bending piston-cylinder unit is arranged. The two ends of the cylinder rods are axially mounted in the windows. In this case, each one of the cylinder rods of a pair of cylinder rods is longitudinally displaceably guided in one of the bending blocks and fixedly connected to the other bending block, while the other cylinder rod is fixedly connected to the one bending block and longitudinally displaceably guided in the other bending block.

The bending blocks are acted upon by bending piston-cylinder units, which are supported against a holding piece. The pairs of bending blocks for the intermediate rolls can therefore be actuated and moved by the work rolls independently of the pairs of bending blocks.

As for example from the 6 can be seen, the elements for setting a support distance between the individual bearing chocks of the intermediate or work rolls for each bearing side three times two hydraulically actuated support elements.

The labor required for this purpose for the hydraulic units and in particular for their control and monitoring units is considerably and more expensive their production and distribution. Furthermore, the variety of hydraulic devices due to contamination possibility is prone to failure and requires ongoing maintenance.

The DE 42 29 551 A1 describes to simplify the work roll change in a rolling mill, in particular in a four-high rolling mill, a distancing device, the work rolls are stored in roll chocks and supported in the rolling stand horizontally displaceable bending and / or balancing devices. A Distanzungsstück the distancing device is a round bolt which can be coupled with an automatically controllable actuator. The actuating element is in the axial direction of a receiving chamber with the round bolt magnetically connectable piston stem of a hydraulically acting piston-cylinder unit. The piston of the piston-cylinder unit is reversing. These are the hydraulic chambers with supply bores for a pressure medium. in connection. Functionally related belong to the distancing device the circular bolt adapted circular segment-shaped recesses, which are arranged in the roll chocks with in the region of their opposite in the roll gap body surfaces.

As a measure against the ingress of dirt particles in the receiving chamber of the piston-cylinder units, at least one sealing element with resting on the outer surface of the round bolt sealing lip is arranged in the opening region of the receiving chamber at its inner walls. During the introduction of the round bolt into the receiving chamber, this sealing lip can strip off dirt particles from its outer surface, center the position of the bolt and close the chamber against the ingress of rolling media or dirt particles.

Also in this known solution results in the large number of hydraulic units and their control elements or devices a high degree of precision work of manufacturing and maintenance costs during operation.

The DE 24 33 569 A1 further discloses a rolling stand having means for raising and lowering the work roll rails when changing rolls, wherein by means of backup roll balancing cylinders, the upper backup roll set are so coupled against the auxiliary setting pulling backup roll balancing trusses with the respective upper rolling machines through the chocks of the back-up roll when raising / lowering the back-up roll balancers, the rolling machines are to be raised / lowered.

Based on the aforementioned prior art, the present invention seeks to provide a device for raising and lowering the upper Zwischenwalzen- or work rolls rails when changing rolls, which can be realized without use specifically designed for these movements hydraulic cylinder, in particular without the addition of this required control and monitoring elements and required additional aggregates.

To solve the problem is proposed in a roll stand with means for raising and lowering the Zwischenwalzen- and / or work roll rails when changing the roll, that with the help of the backup roll balancing the upper support roll set against the auxiliary position pulling support roll balancing trusses with the respective upper roll rails are coupled by connecting rods, such that when raising / lowering of the support roller balancing the roller rails are to raise / lower with.

• – Einsparung von Zylindern und dabei drastische Reduzierung der Fertigungs-, Wartungs- und Montagekosten;
• – Einsparung von Steuerventilen und Gleichlaufventilen;
• – Einsparung von Verrohrungen;
• – Einsparung von Endschaltern;
• – Einsparung von elektrischen Regelungen;
• – Einsparung von Fertigungs-/Montagekosten.

The simplification achieved with the invention over the prior art causes, without affecting the functional activity, for example, the upper intermediate roller rails on which the upper intermediate roller set is moved in or out of the roller change, are coupled to a connecting rod in such a way that the Intermediate roller rails when raising / lowering the support rollers Balancing beam can be raised / lowered with. The coupling of the upper intermediate roll rails and work roll rails to the backup roll balance has the following advantages:

• - Cylinder savings while dramatically reducing manufacturing, maintenance and assembly costs;
• - saving of control valves and synchronizing valves;
• - saving of piping;
• - saving of limit switches;
• - saving of electrical regulations;
• - Saving on manufacturing / assembly costs.

Further embodiment of the invention are provided according to the subclaims.

Details of the invention will become apparent from the following explanation of an embodiment schematically illustrated in the drawings. Show it:

1 A rolling stand in front view with a view along the roll axes;

2 The rolling stand in side view with view of the Walzgutdurchlaufs.

This in 1 and 2 shown rolling stand is provided with means for raising or lowering the upper intermediate roller rails 4 or work roll rails 8th when changing the roll for the intermediate roll set 5 or the work roll set 9 equipped. With the help of the backup roll balancing cylinder 3 These are the upper backup roll set 1 against the auxiliary employment 14 Pulling back up roller balancing traverses 2 with the upper intermediate roller rails 4 through connecting rods 6 coupled. The function of the coupling is such that when lifting / lowering the back-up roller balancers 2 the intermediate roller rails 4 with raised / lowered.

In the illustrated six-roll stand is further provided that additional guide rods 11 and lifting blocks 12 the upper strut rails 8th on which roll change the work roll set 9 is moved in and out, also raised and lowered when the backup roller balancing crossbeams 2 be attracted or relieved. The intermediate roller rails 4 are doing with guide rods 11 in guide bushings 10 guided. The stripper rails 8th are with guides 13 Mistake.

To compensate for a stroke difference when lifting or lowering the intermediate roller rails 4 to those with these through the tie rods 6 coupled back-up roller balancing traverses 2 are spring packages 7 inside the bars 6 intended. The spring packages 7 are designed so that in rolling operation, the intermediate roller rails 4 stay in the lowest position.

In a four-roll stand, the work roll rails 8th but directly over the connecting rods 6 with the backup roller balancing trusses 2 coupled.

And finally, according to the mill stand 1 provided that the connecting rods 6 in holes 15 the trusses 2 with a terminal screw connection 16 slidably guided. The connecting rods 6 are formed in several parts in the embodiment shown and are under support against a connecting element 17 variable in position or variable in length on the spring assembly 7 supported.

The invention is straightforward and allows the saving of cylinders, control valves, synchronizing valves, piping and limit switches and electrical controls and reduces costs for manufacturing and assembly work in an optimal manner.

LIST OF REFERENCE NUMBERS

1

Supporting roller set

2

Traverse of the backup roll balancing

3

Backup roll Ausbalancierungs cylinder

4

Intermediate roll rails

5

Between roll set

6

connecting rod

7

spring assemblies

8th

Work roll bars

9

Work rolls

10

guide bushings

11

guide rods

12

lifting block

13

Guides for strut rails

14

auxiliary employment

15

drilling

16

screw

17

connecting element

Claims (8)

Roll stand with means for raising and lowering intermediate rolls ( 4 ) and / or work roll rails ( 8th ) when changing rolls, characterized in that by means of the backup roll balancing cylinder ( 3 ) the upper support roll set ( 1 ) against the auxiliary employment ( 14 ) pulling support roll balancing trusses ( 2 ) with the respective upper roller rails ( 4 . 8th ) by connecting rods ( 6 . 11 ) in such a manner that, during the raising / lowering of the support roller balancing beams ( 2 ) the roller rails ( 4 . 8th ) are to be raised / lowered. Roll stand according to claim 1, characterized in that in a 4-roll stand the upper work roll rails ( 8th ) through the connecting rods ( 6 ) directly with the support roller balancing crossbeams ( 2 ) are coupled. Roll stand according to claim 1, characterized in that in a 6-roll stand the upper intermediate roll rails ( 4 ) by means of connecting rods ( 6 ) can be raised and lowered and additional guide rods ( 11 ) and lifting blocks ( 12 ) the upper work roll rails ( 8th ) on which the set of work rolls ( 9 ) are to be moved out and in, with the aid of the support roller balancing crossbeams ( 2 ) are raised and lowered. Roll stand according to claim 1, 2 or 3, characterized in that to compensate for a stroke difference during raising and lowering of the intermediate roller rails ( 4 ) to those with them through the connecting rods ( 6 ) coupled backup roll balancing trusses ( 2 ) a suspension ( 7 ) within the connecting rods ( 6 ) are provided. Roll stand according to claim 4, characterized in that the suspension ( 7 ) is designed such that in the rolling operation, the intermediate roller rails ( 4 ) are held in the lowest position. Roll stand according to one or more of claims 1 to 4, characterized in that the intermediate roller rails ( 4 ) with the guide rods ( 11 ) in guide bushes ( 10 ) are guided. Roll stand according to one or more of claims 1 to 6, characterized in that the connecting rods ( 6 ) in holes ( 15 ) of the traverses ( 2 ) with a terminal screw connection ( 16 ) are slidably guided. Roll stand according to one or more of claims 4 to 7, characterized in that the connecting rods ( 6 ) are formed at least in two parts and under support against a connecting element ( 17 ) variable in length on the suspension ( 7 ) are supported.

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