GB1564437A

GB1564437A - Driving roll stand

Info

Publication number: GB1564437A
Application number: GB50777/76A
Authority: GB
Original assignee: Voestalpine AG
Current assignee: Voestalpine AG
Priority date: 1975-12-17
Filing date: 1976-12-06
Publication date: 1980-04-10
Also published as: IT1065184B; SE7613063L; FR2335289B1; FR2335289A1; SE429512B; DE2656774A1; JPS5540346B2; AT342801B; CA1057023A; CH596910A5; ATA956975A; JPS5276225A; BR7608408A

Description

(54) IMPROVEMENTS IN OR RELATING TO A DRIVING ROLL STAND (71) We, VEREINIGTE ÖSTERREiCIIISCHE EIs- UND STAHLwERKE-ALPINE MONTAN AKTIENGESELLSCHAFT, a company organized under the laws of Austria, Werksgelände 4010 Linz, Austria, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a driving roll stand for use in a continuous casting plant, of the kind having a pair of rolls at least one of which is journaled in an adjustable supporting rocker which is pivotally mounted at opposite ends to a stationary stand part.

In such a driving roll stand, which can serve for extracting a continuously cast strand as well as for reducing the thickness of a strand, the rolls must be arranged to be precisely parallel to each other in order to guarantee trouble-free conveying of the strand. Deviations from the parallelism of the rolls, e.g. when the rolls are askew, need to be kept as small as possible.

As far as the production of the stands themselves is concerned, deviations from the parallelism of the rolls can only be avoided by extremely low manufacturing tolerances, which is complicated and expensive. In addition, the rolls may also become askew due to wear, and with known constructions this necessitates dismantling the driving roll stand.

The invention aims at minimising or preventing these difficulties, and its object is to provide a driving roll stand in which the rolls can be adjusted to be precisely parallel to each other, and the production of which is simple, inexpensive, and can be achieved with production tolerances which require only small expenditure. The invention furthermore provides a construction in which it is possible to re-adjust the rolls without having to exchange parts of the driving roll stand, if deviations from the parallelism of the rolls occur due to wear.

According to the present invention, there is provided a driving roll stand for use in a continuous casting plant, comprising a pair of rolls, a stationary stand part, and at least one adjustable supporting rocker in which one of the rolls is journaled and which is pivotally mounted in first and second bearings located at opposite ends thereof to the stationary stand part for movement about an axis substantially parallel to the axis of said roll, and displacement means for displacing the first and second bearings in the supporting rocker in the pivot plane thereof to enable correction of any non-parallelism of the two roll axes.

In a preferred embodiment of the invention, the displacement means comprise, for each bearing, eccentric bolts carried by the stationary stand part and which extend through the respective bearing, the eccentricities of the two bolts being arranged at a right angle to each other prior to displacement of the adjustable supporting rocker.

In order that the invention may be more fully understood, an embodiment in accordance therewith will now be described by way of example with reference to the accompanying drawings, in which: Fig. 1 is a section taken through a driving roll stand, in a direction perpendicular to the roll axes, Fig. 2 is a view in the direction of arrow II in Fig. 1, Fig. 3 is a sectional view of part of Fig. 2 taken along line III--III in Fig. 2, to an enlarged scale, and Figs. 4 and 5 are partial sectional views on an enlargtd scale along lines IV-IV and V-V of Fig. 2.

Referring to the drawings, a lower roll 1 is rotatably journaled at its ends in a stationary stand part 2 and 21 which is screwed onto a base. The upper roll 3 is mounted in an adjustable supporting rocker 6 comprising two side parts 4 and 41 connected by a tubular member 5. Lugs 7 on the side parts 4 and 41 are each pivotally mounted between fork ends 8 of the stationary stand part in bearing 9 and 91, which are designed as artic ulation bearings. The rolls can be driven by motors (not illustrated).

Two pressure medium cylinders 10 are hinged at their lower ends to the stationary stand part 2 and 2', and their piston rods are pivotally connected to the adjustable supporting rockers 6; the pressure medium cylinders 10 serve for adjusting the desired spacing between the rolls.

An eccentrically mounted bolt 12 extends through the centre of each articulation bearing 9 and 9', and is mounted in the fork ends 8 of the stand part 2 and 21 with concentrically arranged truncated conical portions 13 and 14 carried in bushings 15 and 16. The centre portion 17, which also has the shape of a truncated cone and which extends through each of the lugs 7 of the rocker 6, is eccentrically mounted with respect to the conical portions 13 and 14 by an amount e. Thus, rotation of the respective eccentric bolt causes a displacement of the associated bearing relative to the stationary stand part 2 and 2'. Bolts 18 fitted into the stationary stand and extending through recesses in the flange-like end of the conical portion 13 secure the eccentric bolt against undesired rotation. In addition, for further location of the bolt there is provided a threaded stud 19 extending through the bolt, which braces the bolt 12 relative to the bushing 16 surrounding the conical portion 14 and which is fixed in the stationary stand part 2 and 21 by means of screws.

Prior to a precise adjustment of the axis of roll 3 to that of roll 1, the eccentricities of the eccentric bolts 12 enclose a given angle with each other, which is preferably 90 , as shown in Figs. 4 and 5. This means that when the driving roll stand is made, care is taken to ensure that the axes of the rolls 1 and 3 are as parallel to each other as possible with the eccentric bolts in this position.

By rotating the eccentric bolt allocated to the bearing 9 of the rocker 6, this bearing as long as the eccentric bolt is rotated only by a small angle--can be displaced approximately in a direction which encloses an angle of 90" with the direction in which the bearing 91 of the rocker is moved by rotating the eccentric bolt allocated to this latter bearing.

As illustrated in Figs. 4 and 5, the bearing 91 of the rocker 6 can be displaced in approximately a horizontal direction, and the bearing 9 in approximately a vertical direction. This is shown by the arrows in Figs. 4 and 5.

If the rolls 1 and 3 are askew, this can be corrected in the following manner: initially one of the two bearings of the rocker 6 is displaced until the roll axis of roll 3 is in a plane formed by the centre of the bearing and the direction of displacement of the other bearing, and which is directed parallel to the roll axis of roll 1. The other bearing is then displaced until the rolls are parallel to each other.

If both rolls of the driving roll stand are arranged in rockers pivotally mounted on a stationary stand part, it is advantageous to connect both rockers to the stationary stand part by means of the eccentric bolts described.

Instead of the eccentric bolts, which allow for a displacement of each bearing in any one direction and only by small angles of rotation and thus only for correspondingly short adjustment paths, each bearing of the rocker can be displaceably arranged in a straight-line guide mechanism, the two mechanisms enclosing a given angle with each other, which is preferably 90".

WHAT WE CLAIM IS:- 1. A driving roll stand for use in a continuous casting plant, comprising a pair of rolls, a stationary stand part, and at least one adjustable supporting rocker in which one of the rolls is journaled and which is pivotally mounted in first and second bearings located at opposite ends thereof to the stationary stand part for movement about an axis substantially parallel to the axis of the roll, and displacement means for displacing the first and second bearings in the supporting rocker in the pivot plane thereof to enable correction of any non-parallelism of the two roll axes.

2. A driving roll stand as claimed in Claim 1, wherein the displacement means are adapted to displace the first bearing in a direction perpendicular to the displacement direction of the second bearing.

3. A driving roll stand as claimed in Claim 1 or Claim 2, wherein the displacement means comprise, for each bearing, eccentric bolts carried by the stationary stand part and which extend through the respective bearing, the eccentricities of the two bolts being arranged at a right angle to each other prior to displacement of the adjustable supporting rocker.

4. A driving roll stand substantially as hereinbefore described with reference to Figs.

1 to 5 of the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. ulation bearings. The rolls can be driven by motors (not illustrated). Two pressure medium cylinders 10 are hinged at their lower ends to the stationary stand part 2 and 2', and their piston rods are pivotally connected to the adjustable supporting rockers 6; the pressure medium cylinders 10 serve for adjusting the desired spacing between the rolls. An eccentrically mounted bolt 12 extends through the centre of each articulation bearing 9 and 9', and is mounted in the fork ends 8 of the stand part 2 and 21 with concentrically arranged truncated conical portions 13 and 14 carried in bushings 15 and 16. The centre portion 17, which also has the shape of a truncated cone and which extends through each of the lugs 7 of the rocker 6, is eccentrically mounted with respect to the conical portions 13 and 14 by an amount e. Thus, rotation of the respective eccentric bolt causes a displacement of the associated bearing relative to the stationary stand part 2 and 2'. Bolts 18 fitted into the stationary stand and extending through recesses in the flange-like end of the conical portion 13 secure the eccentric bolt against undesired rotation. In addition, for further location of the bolt there is provided a threaded stud 19 extending through the bolt, which braces the bolt 12 relative to the bushing 16 surrounding the conical portion 14 and which is fixed in the stationary stand part 2 and 21 by means of screws. Prior to a precise adjustment of the axis of roll 3 to that of roll 1, the eccentricities of the eccentric bolts 12 enclose a given angle with each other, which is preferably 90 , as shown in Figs. 4 and 5. This means that when the driving roll stand is made, care is taken to ensure that the axes of the rolls 1 and 3 are as parallel to each other as possible with the eccentric bolts in this position. By rotating the eccentric bolt allocated to the bearing 9 of the rocker 6, this bearing as long as the eccentric bolt is rotated only by a small angle--can be displaced approximately in a direction which encloses an angle of 90" with the direction in which the bearing 91 of the rocker is moved by rotating the eccentric bolt allocated to this latter bearing. As illustrated in Figs. 4 and 5, the bearing 91 of the rocker 6 can be displaced in approximately a horizontal direction, and the bearing 9 in approximately a vertical direction. This is shown by the arrows in Figs. 4 and 5. If the rolls 1 and 3 are askew, this can be corrected in the following manner: initially one of the two bearings of the rocker 6 is displaced until the roll axis of roll 3 is in a plane formed by the centre of the bearing and the direction of displacement of the other bearing, and which is directed parallel to the roll axis of roll 1. The other bearing is then displaced until the rolls are parallel to each other. If both rolls of the driving roll stand are arranged in rockers pivotally mounted on a stationary stand part, it is advantageous to connect both rockers to the stationary stand part by means of the eccentric bolts described. Instead of the eccentric bolts, which allow for a displacement of each bearing in any one direction and only by small angles of rotation and thus only for correspondingly short adjustment paths, each bearing of the rocker can be displaceably arranged in a straight-line guide mechanism, the two mechanisms enclosing a given angle with each other, which is preferably 90". WHAT WE CLAIM IS:-

1. A driving roll stand for use in a continuous casting plant, comprising a pair of rolls, a stationary stand part, and at least one adjustable supporting rocker in which one of the rolls is journaled and which is pivotally mounted in first and second bearings located at opposite ends thereof to the stationary stand part for movement about an axis substantially parallel to the axis of the roll, and displacement means for displacing the first and second bearings in the supporting rocker in the pivot plane thereof to enable correction of any non-parallelism of the two roll axes.

1 to 5 of the accompanying drawings.