AT506846A1 - TRAIN TOUR SEGMENT - Google Patents

Description

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Strand guide segment

Technical area

The invention relates to a strand guide segment in the strand guide of a billet or Vorblockstranggießanlagen with a segment frame in the strand guide rollers are arranged in pairs opposite each other for four-sided supporting and guiding a cast metal strand with square or rectangular cross-section centric to a Gießmittenachse.

An essential requirement of continuous casting plants is to cast metal strands with different cross-sectional dimensions with the least possible changeover times. In billet or Vorblockgießanlagen tube molds or plate molds are used depending on the cross-sectional format, which are replaced at a Gießformatwechsel. For larger cross-sections and when casting metal strands of certain steel grades, a format change in the mold or an exchange is not sufficient because of still having a liquid Kem metal strand for stability reasons and to avoid especially a breakthrough after its exit from the mold on all sides very must be precisely supported, guided and cooled. This means that the downstream strand guide segments must also be adapted to the casting format and changed.

State of the art

From EP 512 306 a trained as a caster scaffold guide segment for guiding and supporting a cast metal strand is still known with a pronounced liquid core, as it is used immediately after a mold. Each four oriented in normal to the strand conveying direction, successive levels strand guide rollers support the strand and in particular its still thin strand shell on all sides. The strand guide rollers are supported in a common for all strand guide rollers support frame. such

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However, roller scaffoldings must always be exchanged when the format is changed in the mold.

In the continuous casting of metal strands with a rectangular cross-section, it is usual to provide strand guide segments, regardless of the cross-sectional dimensions, with which the metal strand is supported and guided on its broad sides by successive strand guide rolls. These segments consist of an outer arch segment frame and an inner arc segment frame. In an outer arch segment frame (fixed side), strand guide rollers assume a fixed position and determine the course of the strand guide. In an inner arc segment frame strand guide rollers are supported, which are displaceable together with the inner arc segment frame and are adjustable to changing strand thicknesses. An additional support of the metal strand on its narrow side is not provided here in most cases.

From EP 64 227 a strand guide frame in the straightening zone of a continuous casting is known in which in a scaffolding frame opposite each other a strand guide roller in an outer arch frame and relative to a strand guide roller are supported in an inner arc segment frame. To avoid bulging of the metal strand with still liquid core during the straightening process in the transverse direction (bulging of the narrow side walls) are provided between the strand guide rollers additional, engageable laterally on the strand support rollers whose support frame about a pivot axis in a very limited extent or with a parallel link system to the Strand are adjustable (Figure 1 of EP 64 227). A strand guide segment of this type is spatially very extensive, difficult to replace and with great expenditure of time and thus little suitable for a billet or bloom.

Presentation of the invention

The object of the present invention is therefore to avoid the disadvantages of the known prior art and to propose a strand guide segment for a billet and in particular for a Vorblockstranggießanlage, which in a wide range to different strand cross sections both in terms of thickness extension and in terms of the width extension of a planned Strangformates is automatically adjustable.

In one embodiment of the invention, the object is also to propose an improved adaptable to different strand cross-sections cooling device.

Preferably, with such a strand guide segment strand formats for strands with a strand thickness between 230 and 300 mm and a strand width between 280 and 480 mm should be supported and guided on four sides. In the case of a breakthrough, the segment should be able to open up to 350 mm in the thickness direction and 520 mm in the width direction. This information describes the preferred scope of the invention, but does not limit its scope.

This object is achieved with a strand guide segment of the type described above in that - four roller holders are supported relative to each other movable in the segment frame, on each of which several strand guide rollers are arranged, - that the segment frame guide columns and the guide columns mutually positioning connection frame comprises - Guide columns two support frame are arranged to be longitudinally displaceable, each associated with two mutually normally oriented roll holder, wherein the two support frame are guided symmetrically to a Gießmittenachse slidably, that the inner bow (lot side) of a strand guide segment assigned Rollenhaiter in its support frame in the normal direction on a the outer bow (Fixed side) of the strand guide segment associated with the roll holder is guided to or away from this, - that one of the normal to the inner bow associated roll holder is aligned roller holder is additionally guided in the direction of the opposite lateral roller holder or displaceable from this.

With this structural arrangement in a compact segmental frame and the adjustment options given therein, the setting of any desired strand format and also its alignment with the casting cross-section in the mold and the casting center axis are reliably ensured. 4 ·· ···· ···· ··

Suitably, the two support frames are L-shaped and form a Gießmittenachse enclosing the quarter.

Each support frame is associated with a controllable displacement device which is supported on a guide column of the segment frame.

The roller holder associated with the inner arc of the strand guide frame is assigned a controllable displacement device. With this displacement device, a format adaptation in the direction of the thickness extension of the cast strand is made possible and attached to this inner-arc displacement device strand guide rollers employed on the strand.

In addition, one of the side roller holders, which is aligned normal to the roller holder associated with the inner arc of the strand guide segment, is displaceably guided on this roller holder in the direction of the opposite roller holder or away from it. Thus, in addition to the thickness adjustment by the inner-sheet displacement device allows a width adjustment of the Gießformates and in conjunction with the symmetrical displacement of the two support frame allows the alignment on the position of the Gießquerschnittes in the mold.

This displaceable lateral roller holder is associated with a controllable displacement device which is supported on the inner sheet associated with roller holder.

Suitably, the controllable displacement devices are designed as hydraulic cylinders, and each hydraulic cylinder is associated with a displacement measuring device or a position detection system. In order for Positionseinsteilungen to each strand guide segment or coordinated with each other on several successive strand guide segments in the strand guide a continuous casting and their coordination with the selected Gießquerschnitt in the mold and its position by a displacement means regulating and controlling computing unit easily feasible.

For precise strand-centered cooling of the cast metal strand in the strand guide segment, the outer-arc-side and inner-arc-side sides are • # · · · · · · · · · · · · · · ·

Roller holder outer and inner arc injection register associated with injectable between the strand guide rollers spray nozzles. The outer and inner arc spray registers are slidably supported in a Spritzregisterrahmen and connected to the spray register frame supported injection register adjustment for adjusting the spray nozzle position of the spray nozzle register in dependence on the set casting width.

Each support frame for the width graduation is associated with a control edge, which cooperates with a guide surface on the spray nozzle register, which is preferably formed as an inclined wedge surface. Thus, the spray nozzles between the successive strand guide rollers can be aligned exactly centered on the broad side of the cast strand and at the same time the distance to the strand surface are adjusted so that an edge overspray of the strand is excluded.

The side Rollenhaltem are associated with lateral injection register, These lateral Spritzregistem are assigned in the Spritzregisterrahmen supported injection register adjustment for centric positioning of the spray nozzles on the set format thickness.

Preferably, the controllable injection register displacement devices are designed analogously to the displacement devices for the roller holder as a hydraulic cylinder. According to one possible embodiment, each hydraulic cylinder of the injection register displacement device is associated with a displacement measuring device or a position detection system.

In order to implement an online regulation of the format setting in the strand guide of a continuous casting plant, the displacement devices for the roll holders and the measuring and adjusting devices assigned to them are connected via data lines to a computing unit which, taking into account measured data of the mold or corresponding default values of a higher-order guidance device, adjusts the format in the strand guide segment or more consecutive strand guide segments controls or controls.

According to a further embodiment, it is also possible to equip the displacement device for spray nozzle register with measuring and adjusting devices which are connected via data lines with a computing unit and are controlled by this.

An additional improvement in the quality of the cast metal strand can be achieved if the arithmetic unit for the control of at least one strand guide segments mathematical sub-models are assigned, of which control signals for the controlled positioning of at least one of the shifting devices for performing a soft reduction, a liquid soft reduction, a controlled cone setting, a metallurgical surface treatment or other metallurgical or thermal treatment of the metal strand are generated and that the arithmetic unit controls or controls the format adaptation in the strand guide segment or a plurality of successive strand guide segments according to these control signals.

Brief description of the drawings

Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the following figures, which show:

1 shows a billet continuous casting with a first strand guide segment according to the invention,

FIG. 2 shows a billet continuous casting plant with a plurality of successive strand guiding segments according to the invention, FIG.

3 shows a strand guide segment according to the invention in an oblique angle,

4 shows a segmental frame of the strand guide segment according to the invention in a single view,

5 shows the strand guide rollers attached to the roller carrier in the strand guide segment according to the invention in an oblique angle, ·· ········

6 shows the strand guide rollers attached to the roller carrier in the strand guide segment according to the invention in a plan view,

7 shows the displacement device for the relatively movable roller carriers of the strand guide segment,

8,9 the format adaptation to the casting thickness for two different casting thicknesses,

10 shows the format adaptation to the casting width for two different casting widths, FIG. 11

12 shows a schematic illustration of the device for cooling a metal strand in the strand guide segment according to the invention,

13 shows the format adaptation of the cooling device to casting thickness and casting width for FIG. 14 two casting formats.

15 shows a schematic representation of the control of the strand guide segments in a strand guide.

Embodiment of the invention

In FIGS. 1 and 2, a partial region of a continuous slab casting plant is schematically illustrated, which shows a mold 1 and a first section of a strand guide 2 downstream of the mold.

The mold 1 is formed as a plate mold, with a mold cavity 3 for receiving molten metal and the formation of a metal strand with a liquid core and a predetermined cross-sectional format. The mold 1 is associated with a Gießmittenachse 4, resulting from the specified casting thickness D and casting width B, and the mold 1 has a fixed side F, with the generatrix of the strand guide 5 on the fixed side in the downstream strand guide segments 6, 7,8 , 9 is aligned. In the strand guide a plurality of strand guide segments are arranged, in which the cast strand is supported and guided as shown in FIG. 1 in a first strand guide segment 6 according to the invention on all four strand sides of strand guide rollers, which ···· ···· r »· · · · ·

Then, a strand guide segment 7 of a simpler design follows, which secures only a bow outer side and a bow inner side strand support when a sufficient strand shell thickness is reached. 2 shows an embodiment of a strand guide is shown in which an all-round strand support of the strand with still pronounced liquid core over several consecutive strand guide segments 6, 8, 9 of the type according to the invention. It can also be arranged over the entire strand guide segments of the type according to the invention. The strand guide segments are adjusted with fasteners not shown 9 on a segment support frame 10 in the strand guide and fixed.

FIG. 3 shows a strand guide segment 6 in an oblique view. All components of the strand guide segment, which are explained below, are arranged in a rigid segment frame 11. The cuboidal basic structure of the segmental frame 11 consists of four cylindrical guide columns 12, which are rigidly fastened with their ends in two connecting frames 13 (FIG. 4). Two of the guide columns 12a arranged one above the other in the casting direction G are assigned to the outer arc in the strand guide and accordingly form the fixed side F in the strand guide and the opposite guide columns 12b are assigned to the inner arc of the strand guide and form the loose side L in the strand guide 2 (FIG ).

Both on the fixed side F and on the Losseite L each one in its basic structure L-shaped support frame 15a, 15b is arranged. Each support frame 15a, 15b engages with annular support tabs 16 two associated guide columns 12a or 12b, on which it is slidably supported in the longitudinal direction of the guide columns 12a, 12b. The displacement movement of the support frame 15a, 15b takes place with a controllable displacement device 17 formed by a hydraulic cylinder, which is articulated on one of the annular support lugs 16 of the support frame 15a, 15b and on the guide column 12a, 12b. The controllable displacement devices 17 assigned to the two support frames 15a, 15b are oppositely positioned and effective, so that, in the case of a casting format width change, a symmetrical, oppositely directed displacement movement of the two support frames 15a, 15b takes place relative to the casting center axis 4. The two L-shaped support frame are arranged so that they form a Gießmitten axis encompassing the quadrant.

This allows an aligned positioning of the set strand format on the casting format in the mold.

The L-shaped structure of the two support frames 15a, 15b favor the stable arrangement of the cast strand supporting and leading strand guide rollers 5 on all four sides of the cast strand along its length over the respective segment length, as shown in Figs. In each case five strand guide rollers 5 arranged one behind the other in the strand conveying direction are rotatably supported on four roller holders 18a, 18b, 18c, 18d. A roller holder 18a for the support of the strand in the direction of its width extension B is assigned to the support frame 15a on the fixed side F and fixed thereon immovably and directly on it. The generatrix of these strand guide rollers 5 is aligned with the fixed side of the mold. A roller holder 18c for the support of the strand in the direction of its thickness extension D is also fixed directly on the loose side L associated support frame 15b and immovably on him. These two roller holders 18a, 18c are at right angles to each other. The strand guide rails 5 associated with these two roller stops 18a, 18c determine the position of the cast strand in the strand guide segment 6 as a function of the format width B of the strand. The two other roller holders 18b, 18d lying opposite these roller holders 18a, 18c must assume a position in the format adjustment process which corresponds to the selected strand width B and strand thickness D and can therefore assume a position independent of the position of the two support frames 18a, 18c.

As can be seen from FIGS. 3 and 7, a roll holder 18b assigned to strand side guide rollers 5 is guided along horizontal guides 19 of the support frame in the normal direction towards the opposite roll holder 18a of the fixed side F and away from it with two controllable displacement devices 20 adjustable, which are hinged to the reel holder 18b and supported in the L-shaped support frame 15b of the lot L side. The horizontal guides 19 are formed by guide blocks 19a, which are firmly anchored in the support frame 15b, and have through holes which are penetrated by guide rods 19b, which are articulated to the roller holder 18b. For a format adaptation to the strand thickness of the cast strand is ensured and also a continuous hiring or pressing the strand guide rollers to the strand possible. These ·· ·· ···· ····

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Format adaptation to the casting thickness is illustrated in FIGS. 8 and 9 with two different casting thicknesses.

It can further be seen from FIG. 7 that the roll holder 18b associated with the loose side L carries on its rear side also a L-shaped support frame 21 to which the roll holder 18d is fastened along its thickness for the support of the cast strand. This L-shaped support frame 21 is slidably guided with its one leg 21a on the back of the Losseiten roll holder 18b parallel to its width extension and connected to a controllable displacement device 22 which is supported on the back of the roll holder 18b. On the second leg 21b of this L-shaped support frame 21 equipped with strand guide rollers 5 roller holder 18d is fixed, which passes through the support frame 15a of the fixed side from behind with its strand guide rollers. By this arrangement, there is the possibility, on the one hand to move the roller holder 18b of the Losseite L together with the positioned over the L-shaped support frame 15b side roller holder 18d to determine the strand format in the direction of thickness or on the other hand, the lateral roller holder 18d by a relative movement relative to the Losseiten roll holder 18b to determine the strand format to move in the direction of the width extension.

The format adaptation to the casting width B is illustrated in FIGS. 10 and 11 in two different casting widths B.

In Figures 12 to 14, the means for cooling the cast metal strand and the format-dependent employment are shown on the metal strand. All four roller holders 18a, 18b, 18c, 18d are each assigned an injection register 24a, 24b, 24c, 24d for strand cooling. Each injection register has in each case at least one spray nozzle 25 between strand conveying rollers 5 which follow one another in the direction of strand delivery and which are in the center, i. are directed at the same distance from the strand edges on the strand surface. The spray nozzle 25 leaving fan-like emerging coolant jet 26 thus ensures a uniform strand cooling and avoids overspray the strand edges.

Outer and inner arc injection register 24a, 24b are on an integrated in the segment frame 10 spray register frame 27 on guide rods 28 in

Slidably guided in the direction of the strand surface of the metal strand and are connected to a spray register displacement device 29, which in turn is abstützgest the Spritzregisterrahmen 27. Each support frame 15a, 15b for the width adjustment is associated with a control edge 31 formed by an inclined Keiifiäche 30, which cooperates with a guide surface 32 on the Spritzregisterrahmen 27 and brings the spray nozzles in a central position to the broad side of the cast strand or between the side roller carriers. In order for a spraying width-dependent positioning of the spray nozzle is ensured in a certain normal distance from the strand surface to be cooled and by the additional central centering edge overjections are avoided.

The side roller holders 24 c, 24 d assigned to the lateral roller holders 18 c, 18 d are likewise guided in the spray register frame 27 on guide rods 28 and coupled to an injection register displacement device 29, which in turn is supported on the spray register frame 27. The guide rods 28 allow the injection register 24c, 24d to be displaced in a direction parallel to the longitudinal extent of the strand guide rollers 5 on the lateral tube holders 18c, 18d. In the illustrated embodiment is not intended to additional employment in the normal direction on the strand surface, but it is quite possible to provide this analogous to the Spritzregisteranstellungen on the loose and fixed side.

In Figures 13 and 14, the sliding movement of the injection register is illustrated in a format adjustment both in the direction of the casting thickness and in the direction of the casting width.

The controllable displacement devices 17, 20, 22 are formed by controllable hydraulic cylinders, to each of which a path measuring device or a position detection system 34 is assigned. Data lines 35, which may also be formed as a data bus system, which may also represent a radio link, connect the displacement devices 17, 20, 22 or their associated measuring and control devices 34 with a regulating arithmetic unit 33. The computer is in a higher-level system Integrated circuit and receives format specifying default data, which it includes in the segment control or the control of several co-operating strand guide segments.

Strand guide segments of this type are not exclusively for supporting and guiding square or rectangular strand formats usable. They can equally be used for supporting and guiding strands with different strand formats, such as round, rounded, polygonal or beam blank cross-sections.

LIST OF REFERENCES: 1 2 3 4 5 6, 7,8 9 10 11 12a, 12b 13 15a, 15b 16 17 18a, 18b, 18c, 18d 19 19a 19b 20 21 21a, 21b 22 24a, 24b, 24c, 24d 25 26 27 28 29 30 31 32 33

mold

strand guide

Mold cavity of the mold

Gießmittenachse

Strand guide roller

Strand guide segment

Fastening device of the segments

Segment support frame

Segment frame guide columns

Connecting frame L-shaped supporting frame

support straps

Displacement device of the L-shaped support frame

roll holder

Horizontal guide Guide block Guide rod

Sliding device of the roller holder L-shaped support frame

Legs of the L-shaped support frame

Shifting device of the roller holder 18b

spray register

Spray nozzle coolant jet

Spray register frame guide rod

Spray register shifter

wedge surface

Control edge guide surface

computer unit

Path measuring device or position recognition system data line

casting

casting thickness

casting width

fixed side

loose side

Claims (14)

·········· 1. Strand guide segment in the strand guide (2) of a billet or Vorblockstranggießanlagen with a segment frame (11), in the strand guide rollers (5) in pairs opposite to the four-sided supporting and guiding a Cast metal strand with square or rectangular cross-section are arranged centrally to a Gießmittenachse (4), characterized in that - in the segment frame (11) four roll holders (18a, 18b, 18c, 18d) are supported relative to each other movable, on each of which several strand guide rollers ( 5) are arranged, - that the segment frame (11) guide columns (12a, 12b) and the guide columns (12a, 12b) mutually positioning connecting frame (13), - that on the guide columns (12a, 12b) two Tragrahme n (15a, 15b) are arranged longitudinally displaceable, which in each case two mutually normally oriented roller holder (18a, 18c and 18b, 18d) are assigned, wherein the two support frames (15a, 15b) are guided symmetrically to a Gießmittenachse (4) displaceable, - in that a roll holder (18a) assigned to the inner bow (loose side L) of a strand guide segment is displaceably guided in its support frame (15a) in the normal direction on a roll holder (18b) assigned to the outer bow (fixed side F) of the strand guide segment, - that one the lateral roll holder (18d) aligned normal to the roll holder (18b) associated with the inner sheet (lot side L) is additionally guided displaceably in the direction of the opposite lateral roll holder (18c) or away from it. Second strand guide segment according to claim 1, characterized in that the two support frames (15a, 15b) are L-shaped and form a Gießmittenachse (4) enclosing the foursquare. 16 • · ··· ·· 3. strand guide segment according to one of the preceding claims, characterized in that each support frame (15a, 15b) is associated with a controllable displacement device (17) which is supported on a guide column (12a, 12b) of the segment frame (11). 4. strand guide segment according to one of the preceding claims, characterized in that the inner arc (lot side L) of the strand guide segment associated with roller holder (18 b) is associated with a controllable displacement device (20). 5. strand guide segment according to any one of the preceding claims, characterized in that one of the lateral roller holder (18d), which is aligned normal to the inner bow (lot side L) of the strand guide segment associated roller holder (18b), on this roller holder (18b) displaceable in the direction to the opposite roller holder (18 c) or is guided away from it. 6. strand guide segment according to claim 5, characterized in that this displaceable lateral roller holder (18d) is associated with a controllable displacement device (22) which is supported on the inner arc of the strand guide segment associated roller holder (18b). 7. strand guide segment according to one of the preceding claims, characterized in that the controllable displacement means (17, 20, 22) are designed as hydraulic cylinders, and each hydraulic cylinder is associated with a displacement measuring device (34) or a position detection system. 8. strand guide segment according to one of the preceding claims, characterized in that the outer arc-side and the inner-bow-side roll holder (18 a, 18 b) outer and inner arc injection register (24 a, 24 b) between the strand guide rollers (5) positionable spray nozzles (25) are assigned, that the Outer and inner arc injection register (24a, 24b) slidably supported in a Spritzregisterrahmen (27) and supported on the Spritzregisterrahmen, optionally controllable, injection register displacement devices (29) to ····· # ···· 17 • · • · Adjusting the spray nozzle position of the spray nozzle registers depending on the set casting width (B). 9. strand guide segment according to claim 8, characterized in that each support frame (15 a, 15 b) is associated with a control edge (31) which cooperates with a guide surface (32) on the spray nozzle register (24 a, 24 b), preferably as an inclined wedge surface (30). is trained. 10. strand guide segment according to one of the preceding claims, characterized in that the lateral injection registers (24c, 24d) in Spritzregisterrahmen (27) supported, optionally controllable, injection register displacement means (29) for the centric positioning of the spray nozzles (25) to the set format thickness ( D) are assigned. 11. strand guide segment according to one of the preceding claims 8 to 10, characterized in that the controllable injection register displacement means (29) are designed as hydraulic cylinders. 12. strand guide segment according to claim 11, characterized in that each hydraulic cylinder of the injection register displacement device (29) is associated with a displacement measuring device or a position detection system (34). 13. Strand guide segment according to one of the preceding claims, characterized in that the displacement devices (17, 20, 22) for the roll holders (18a, 18b, 18c, 18d) and their associated measuring and adjusting devices (34) via data lines (35) are connected to a computing unit (33), which controls the format adaptation (B, D) in the strand guide segment (6) or a plurality of successive strand guide segments (6, 7, 8, 9), taking into account obtained measurement data of the mold or corresponding default values of a higher-order guide or controls. 14. strand guide segment according to claim 13, characterized in that the arithmetic unit (33) for the control of at least one of the strand guide segments (6, 7, 8, 9) associated with mathematical submodels 18 ·········· ··· · Of which control signals for the controlled positioning of at least one of the displacement devices (17, 20, 22) for performing a soft reduction, a liquid soft reduction, a controlled cone adjustment, a metallurgical surface treatment or other metallurgical or thermal treatment of the metal strand are generated and that the arithmetic unit according to these control signals, the format adjustment in the strand guide segment (6) or more consecutive strand guide segments (6, 7, 8, 9) controls or controls.