KR20090130300A - Strand guide, in particular for a continuous steel slab casting installation - Google Patents

Abstract

The invention relates to a strand guide (1), in particular for a continuous steel slab casting installation, comprising a number of segments (2), which support a strand (3) with supporting elements (6, 7) on two sides (4, 5) lying opposite each other, wherein the supporting elements (6, 7) for guiding the strand (3) in a conveying direction (F) are arranged in at least one lower frame (8) and at least one upper frame (9) and wherein the frames (8, 9) are arranged on at least one central tie bar (10). To make it easier to change the segments or parts thereof, the invention provides that there are means (11) with which the at least one upper and/or at least one lower frame (8, 9) can be adjusted in relation to the at least one central tie bar (10), in or counter to the conveying direction (F).

Description

Strand guide for steel slab continuous casting machine {STRAND GUIDE, IN PARTICULAR FOR A CONTINUOUS STEEL SLAB CASTING INSTALLATION}

The present invention relates, in particular to strand guides provided for steel slab continuous casting devices, to said strand guides comprising a plurality of segments supporting the strands with support members on two sides arranged facing each other. In the present case the support members are arranged in at least one lower frame and at least one upper frame for guiding the strands in the conveying direction, and the frames are arranged in at least one central tie bar.

Strand guides of this type are known, for example, from DE 198 24 366 A1. The strand guide comprises a plurality of support segments, which form a casting bow having guides and drive rollers arranged in opposing rows. In this regard the rollers are mounted in the upper and lower frames. The frames are arranged in the center tie bar (or side frame).

Similar solutions have been disclosed from DE 1 965 115 A1, DE 40 34 141 C1, EP 0 879 106 B1, EP 1 286 796 B1 and DE 26 20 888 C2.

In the case of the above known solutions, the problem is the removal or mounting of an arcuate segment comprising a central tie bar guide from or within the strand guide. The removal and mounting of the segments and the movement of the segments in connection with them in the direction of the center of the casting beam (i.e., perpendicular to the segment axis or the conveying direction) can cause problems with collisions with adjacent segments.

This occurs especially in casting machines with small casting radii. In this regard, segments can often be removed only when moving the segment upper frame towards the stripping format. Most of these stripping formats are smaller than the largest format to cast. Thus, due to operational interference when casting the maximum format, significant problems may arise when removing segments.

It is therefore an object of the present invention to design such strand guides in the first-mentioned form of strand guides in such a way that the removal and mounting of the segments or parts of these segments is possible in an improved manner even when the casting radius is very small.

A solution of this object according to the invention is a means that can be used such that at least one upper frame and / or at least one lower frame can be positioned relative to the at least one central tie bar in the transport direction or vice versa. It is characterized by being provided.

In this regard each center tie bar is arranged on each side of the segment.

The means described herein preferably comprise at least one actuator capable of moving one of the frames in the conveying direction relative to the center tie bar. The actuator may be formed as a piston-cylinder unit acting on both sides. The actuator may also comprise two piston-cylinder units disposed in the center tie bar.

The actuator may be formed as a hydraulic piston-cylinder system, as a pneumatic piston-cylinder system, or as a mechanical length adjusting member. When formed as a mechanical length adjusting member, the actuator may comprise a threaded spindle driven by an electric motor.

The support members are preferably formed as rollers rotatably mounted in the frame, driven or not driven. The segments preferably form a casting beam. However, the segments can also be used for the vertical or horizontal extension area of the strand guide.

Below the center tie bar there is also provided a segment lower frame structure which is generally formed for the upper frame guide. In addition, a plurality of side frame tie bars may be formed for each segment on one side.

The proposal according to the invention achieves that removal and mounting of the segment can be inherently simplified, or even preferentially possible under certain operating conditions, especially in casting machines with small casting radii. The upper frame of the adjacent segment can be conveyed in such a way that complete withdrawal, ie collision free withdrawal, of the segment is possible by the so-called position adjusting means for removing the segment. In other words, after the upper frame of the adjacent segment has been transported, the continuous casting segment can be guided through the adjacent segment along its own segment axis, ie perpendicularly with respect to the fixed side.

This is found to be very desirable, especially in curved segments.

In the drawings, an embodiment of the present invention is shown.

1 is a side view schematically showing a casting beam of a strand guide of a continuous casting machine.

FIG. 2 is a schematic diagram showing three segments in a cast beam with three adjacent segments in a workable position. FIG.

FIG. 3 is a schematic view of the three segments with one of the three segments according to FIG. 2 in the disengaged position.

<Description of main parts of drawing>

1: strand guide

2: segment

2 ', 2 ", 2"', 2 "": segment

3: strand

4: side of the strand

5: side of the strand

6: supporting member (roller)

7: support member (roller)

8: lower frame

9: upper frame

10: central tie bar

11: position adjusting means

12: actuator

13: stripping space boundary

14: Collision point

15: central axis of the upper frame

16: mounting play

17: adjustment cylinder

18: Central axis of the center tie bar

19: stripping space boundary

F: feed direction

x: displacement travel

1 shows a casting beam of the strand guide 1 of a continuous casting machine. The casting beam consists of a plurality of segments 2 in a known manner, which segments allow the casting strands for the casting strands to be deflected from the vertical direction to the horizontal direction (not shown here) behind the casting die. The arc extensions are positioned relative to each other in a manner provided. Each segment 2 consists essentially of two frames 8, 9 as a component, namely a lower frame 8 and an upper frame 9, within which the support members 6, 7. ) Is mounted in the form of a roller. In this regard the rollers 6, 7 may or may not be driven, and the frames 8, 9 may comprise two types of rollers. The range of travel in the feed direction F is thus limited for the casting strand.

The configuration of the segment 2 according to the embodiment of the invention can be seen from FIG. 2. The segments forming the casting beams are marked 2 ', 2 ", 2"' and 2 "" (FIG. 3). The segments 2 used are those segments that include a central tie bar guide. Each segment 2 ', 2 ", 2"' includes a central tie bar 10, on which the T-shaped base of the center tie bar has a lower frame (not shown in detail in Figures 2 and 3). (8) is fixedly arranged and this lower frame bears the supporting member in the form of a roller (6). The support member also supports one side side 4 of the strand 3. In addition, the upper frame 9 is arranged on the center tie bar 10 to support the support member of the same shape in the form of a roller 7, which guides the side surface 5 of the strand 3.

The relative adjustment of the rollers 6, 7 to one another, in other words the adjustment of the play present for the strands 3 between the rollers 6, 7, is made by means of the adjustment cylinder 17 as is known.

The essential point here is that the upper frame 9 is not arranged fixed to the center tie bar 10 (except that the inter-roll spacing between the rolls 6, 7 is always adjusted by the adjusting cylinder 17). The upper frame 9, via the position adjusting means 11, in such a way that the upper frame 9 can be conveyed in the conveying direction F relative to the central tie bar 10. ) Is placed on the point. The means 11 comprise in this case an actuator 12 consisting of two piston-cylinder units. Thus by means of two piston-cylinder units the upper frame 9 can be displaced in the conveying direction F relative to the center tie bar 10 or in the opposite direction. To this end, a suitable sliding guide is provided by the actuator 12 to allow a stable displacement movement of the upper frame 9 relative to the center tie bar 10.

The effect thus achieved can be seen from the contrast of FIGS. 2 and 3. If it is necessary to remove the segment 2, more precisely the right segment 2 "'in the embodiment of FIG. 2 or FIG. 3, for this purpose a predetermined mounting space is provided so that the segment can be removed in the direction of the center of the casting beam. need.

2 shows the possible working positions of the segment 2. 2, stripping space boundary 13 is indicated by a broken line. If the right segment 2 "'is removed in the direction of the center of the casting beam, the segment may collide with the upper frame of the center segment 2" at the position indicated by 14.

In order to prevent this, the process proceeds as shown in FIG. 3.

The upper frame 9 of the segment 2 "shown in the middle (similar to the upper frame of the segment 2" "adjacent to the right side only shown in FIG. 3 only) is provided by the actuator 12 with a center tie bar ( Displaced in the direction opposite to the conveying direction F relative to 10. The central axis 15 of the upper frame 9 is thus spaced apart from the central axis 18 of the central tie bar 10. In FIG. It can be seen that the upper frame 9 is displaced from the center tie bar 10 by the displacement moving distance x by the actuator 12. Thereby, the mounting play 16 in the region of the stripping space boundary 13 is provided. This is also done in the upper frame of the segment 2 "" which is displaced in the feed direction F adjacent to the right side of the segment 2 "'to be removed, whereby another stripping space boundary ( There is a mounting play corresponding to the area of 19).

Thus, the segment 2 ″ ′ shown on the right side in FIG. 3 can be detached from the strand guide toward the center of the casting beam without collision.

Any system may be used to adjust the position of the actuator 12. According to the arrangement of the present invention, a hydraulic piston-cylinder system is provided. But very similarly, an electrical system can be used. In other words, for example, a screw spindle or other mechanical gear device and an electric motor for driving the spindle or gear device can be used. Pneumatic systems are likewise possible.

In other words, the present invention provides for the displacement of the upper frame of the segment perpendicularly (parallel to the fixed side) with respect to the segment axis using a suitable operating member, in particular so as to provide the mounting space required for removal or mounting of the segment. do.

The configuration of the actuator 12 consisting of two working cylinders as provided according to the embodiment selectively permits displacement of the upper frame 9 in the right or left direction in the figure depending on the segment to be removed or mounted.

2 shows a possible working position of the device of the present application. It is to be noted that the position adjustment of the upper frame 9 can also be used as a variable adjustment possible in the casting mode of operation, for example to enable displacement of the straightening point.

The proposal of the invention is particularly preferably used in curved segments of slab and thin slab continuous casting machines.

Claims (11)

A strand guide 1, in particular provided for a steel slab continuous casting system, comprising a plurality of segments 2 supporting the strand 3 with support members 6, 7 at two opposite sides 4, 5 facing each other. ), The support members 6, 7 are arranged on at least one lower frame 8 and at least one upper frame 9 to guide the strand 3 in the conveying direction F In the strand guide 1, the frames 8, 9 are arranged on at least one central tie bar 10. The at least one upper frame 9 and / or the at least one lower frame 8 can be positioned relative to the at least one central tie bar 10 in the conveying direction F or vice versa. A strand guide, characterized in that the means (11) used are provided. 2. Strand guide according to claim 1, characterized in that each center tie bar (10) is arranged on each side of the segment (2). 3. Strand guide according to claim 1 or 2, characterized in that the segments (2) form a casting beam. 4. The means (1) according to any one of the preceding claims, wherein the means (11) moves one of the frames (8, 9) in the feed direction (F) relative to the center tie bar (10). Strand guide, characterized in that it comprises at least one actuator (12). 5. The strand guide according to claim 4, wherein the actuator (12) is formed as a piston-cylinder unit acting on both sides. 5. The strand guide according to claim 4, wherein the actuator (12) comprises two piston-cylinder units disposed in the center tie bar (10). The strand guide according to claim 4, wherein the actuator is formed as a hydraulic piston-cylinder system. The strand guide according to claim 4, wherein the actuator is formed as a pneumatic piston-cylinder system. The strand guide according to any of claims 4 to 6, wherein the actuator (12) is formed as a mechanical length adjusting member. 10. The strand guide according to claim 9, wherein the actuator (12) comprises a threaded spindle system driven by an electric motor. 11. A support according to any one of the preceding claims, characterized in that the support members (6, 7) are formed as rollers rotatably mounted or driven in the frames (8, 9). Strand guide.

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