EP3097995B2 - Strand guide segment of a ontinuous casting line and continuous casting line - Google Patents

Description

• wobei das Segment ein inneres und ein äußeres Segmentteil aufweist, zwischen denen im Betrieb ein Metallstrang geführt wird,
• wobei die Segmentteile jeweils mehrere in einer Strangförderrichtung sequenziell aufeinanderfolgende Rollen aufweisen, die sich an dem jeweiligen Segmentteil abstützen,
• wobei die Rollen quer zur Strangförderrichtung gesehen jeweils in mehrere Ballen unterteilt sind, zwischen denen sich jeweils eine Lücke befindet, die eine jeweilige Lückenbreite aufweist.

The present invention is based on a segment of a strand guide of a continuous casting plant,

• wherein the segment has an inner and an outer segment part, between which a metal strand is guided during operation,
• wherein the segment parts each have a plurality of rollers which follow one another sequentially in a strand conveying direction and are supported on the respective segment part,
• the rollers are each divided into a plurality of bales, viewed transversely to the strand conveying direction, between which there is a gap which has a respective gap width.

• wobei die Stranggießanlage eine Kokille und eine der Kokille nachgeordnete, vertikale oder bogenförmige, Strangführung aufweist,
• wobei mittels der Kokille ein brammenförmiger Metallstrang gegossen wird, der mittels der Strangführung in einer Strangförderrichtung aus der Kokille abgezogen wird,
• wobei der Metallstrang quer zur Strangförderrichtung gesehen eine Strangbreite aufweist, die zwischen einer Minimalbreite und einer Maximalbreite liegt,
• wobei die Minimalbreite und die Maximalbreite durch die Konstruktion der Kokille bestimmt sind,
• wobei die Strangführung mehrere in Strangförderrichtung sequenziell aufeinanderfolgende Segmente aufweist.

The present invention is also based on a continuous casting plant

• wherein the continuous casting plant has a mold and a vertical or curved strand guide arranged downstream of the mold,
• wherein a slab-shaped metal strand is cast by means of the mold, which is drawn off from the mold by means of the strand guide in a strand conveying direction,
• wherein the metal strand, viewed transversely to the strand conveying direction, has a strand width that lies between a minimum width and a maximum width,
• where the minimum width and the maximum width are determined by the design of the mold,
• wherein the strand guide has a plurality of segments that follow one another sequentially in the strand conveying direction.

From the WO 2006/050868 A1 such a segment and the associated continuous casting plant is known.

From the EP 1 767 289 A2 an arrangement of several rollers in a strand guide of a continuous casting plant is known, between which a metal strand can be guided during operation. It remains unclear whether and if so, which of the figures 1 , 3 and 4 rollers shown are assigned to a segment of the strand guide (also strand guide segment) and these rollers are supported on the respective inner or outer segment part of the strand guide segment.

The metal strand is supported and guided by means of the rollers arranged in the strand guide. The metal strand is often not completely solidified. It therefore exerts a metallostatic pressure on the rollers, for example a ferrostatic pressure when casting steel.

In older continuous casters, the rolls are often designed as continuous rolls, i.e. the rolls have a single barrel that extends beyond the maximum width and a little more. With this construction, the rollers can only be supported at the ends of the rollers, viewed transversely to the strand conveying direction. The metallostatic pressure therefore leads to a relatively large deflection of the rollers. In more recent continuous casting plants, the rolls are often subdivided, i.e. they have several balls viewed transversely to the direction of continuous casting. In the gap between any two adjacent bales there is support, typically in the form of a roller or ball bearing. This can significantly reduce the deflection of the rollers. It is possible that the gaps between the bales are in the same place when viewed transversely to the strand conveying direction.

The cast metal strand is intensively cooled in the continuous casting plant. On the one hand, the continuous casting mold is already cooled (primary cooling). On the other hand, intensive cooling (secondary cooling) also takes place in the strand guide. As part of the secondary cooling, water or a water-air mist is sprayed onto the metal strand. Furthermore, heat is also dissipated from the metal strand as a result of contact with the roll body.

The heat dissipation via the roll body takes place to a different extent than cooling through water or the water-air mist.

If according to the teaching of EP 1 767 289 A2 If possible transversely to the strand conveying direction, the gaps in the rollers are offset per segment part compared to the gaps in the immediately following roller by more than the respective gap width, in particular uniform cooling of the cast metal strand can be achieved. Continuous lanes along which water can run down the metal strand can also be avoided.

The object of the present invention is to further develop a segment of the type mentioned at the outset in such a way that stable and uniform guidance of the cast metal strand can be guaranteed with little constructional and logistical effort and regardless of the number of rollers of the segment parts, with uniform cooling at the same time of the cast metal strand is to be maintained across the strand width.

The object is solved by a segment with the features of claim 1. Advantageous configurations of the segment according to the invention are the subject matter of dependent claims 2 to 11.

The rollers of the respective segment part, in which the gaps in the respective roller are arranged symmetrically to the segment center line, viewed transversely to the strand conveying direction (hereinafter referred to as symmetrical rollers for short), ensure particularly reliable and safe guidance of the cast, usually slab-shaped, metal strand. Due to the correspondence of the bales of directly consecutive rolls, in which the gaps in the rolls are arranged asymmetrically to the segment center line, viewed transversely to the strand conveying direction (hereinafter referred to as asymmetric rolls for short), the asymmetrical rolls as such are uniform to one another and only rotated by 180°.

By assigning several rollers sequentially in the strand conveying direction to an inner or outer segment part, it is possible to expand the strand guide segment consisting of the inner and the outer segment part independently of the upstream or downstream areas of the strand guide. In addition, the metallurgical length of the continuous caster can be easily and quickly changed by adding or removing strand guide segments.

The strand guide segment according to the invention can be used in vertical, curved or horizontal strand guides. However, since the cooling medium (also called splash water) running down - due to gravity - creates unequal cooling conditions, especially with vertical or curved strand guides, use there is particularly advantageous.

According to the invention, seen in the strand conveying direction, the gaps are arranged asymmetrically to the segment center line, seen transversely to the strand conveying direction, both in the first and in the last roll of the respective segment part. As a result, in a sequence of identical segments that follow one another, the last roll of one segment forms a pair of rolls with the first roll of the following segment, in which the gaps between the two rolls are arranged asymmetrically to the segment center line, viewed transversely to the strand conveying direction, and furthermore the Balls of one roll correspond to the balls of the other roll in reverse order.

Preferably, with respect to each symmetrical roll, both the gaps of the immediately upstream roll and the gaps of the immediately downstream roll are arranged asymmetrically to the segment center line, viewed transversely to the strand conveying direction. This avoids symmetrical roles immediately following each other.

The barrels of the first roll of the respective segment part, seen in the strand conveying direction, preferably correspond to the barrels of the last roll of the respective segment part, seen in the strand conveying direction, in reverse order. This allows a sequence of identical segments to be formed, with the offset of the gaps from roll to roll being retained not only within the respective segment but also at the segment transition.

A drive is preferably assigned to each of the symmetrical rollers of the respective segment part, either fixedly or via a clutch. This configuration optimizes the reliable guidance of the cast metal strand.

Preferably, the offset of the gaps relative to the gaps of the roll immediately following in each case is at least 10 mm greater than the gap width. As a result, a sufficient interruption of the continuous lanes is effected with great certainty.

The barrels of the rolls each have a maximum barrel length. Furthermore, they have a roll diameter that is uniform for the barrel of the respective roll. The respective maximum bale length is preferably between 3 times and 4.5 times the respective roll diameter. This configuration minimizes the number of bales per roll on the one hand and keeps the deflection of the rolls at a low level on the other. In particular, the respective maximum barrel length is preferably between 3 and 3.8 times the respective roll diameter for symmetrical rolls and between 3.5 and 4.5 times the respective roll diameter for asymmetrical rolls.

In the case of symmetrical rolls, either all bales preferably have a uniform bale length or only a single bale has a bale length that differs from the other bales. In the case of asymmetrical rolls, preferably only one single bale has a different bale length from the other bales. This configuration simplifies the design of the segment.

For structural reasons, the barrel length is preferably at least 250 mm and, to limit deflection, preferably a maximum of 900 mm.

The asymmetrical rollers preferably have a uniform roller diameter. As a result, structurally identical rollers can be used for the asymmetrical rollers.

Furthermore, the symmetrical rollers of the respective segment part preferably also have a uniform roll diameter. As a result, structurally identical rollers can also be used for the symmetrical rollers. However, the roller diameter of the symmetrical rollers is preferably larger than the roller diameter of the asymmetrical rollers.

As a rule, the inner and the outer segment part have an equal number of rollers, with the rollers of the inner and outer segment part lying opposite one another in relation to the metal strand. Preferably, viewed transversely to the strand conveying direction, the barrels of the rollers of the inner segment part correspond to the barrels of the respective opposite roller of the outer segment part in the same order or in reverse order. As a result, a particularly stable support of the metal strand can be brought about.

The object is also achieved by a continuous casting plant with the features of claim 12. Advantageous configurations of the continuous casting plant according to the invention are the subject matter of dependent claims 13 and 14.

According to the invention, a continuous casting installation of the type mentioned at the outset is designed in that the segments are designed according to the invention.

Preferably, in the case of symmetrical rolls, the outer balls extend at least 30 mm - in particular at least 40 mm - beyond the minimum width inwards towards the segment center line. This configuration ensures that the metal strand is reliably guided and conveyed. At the same time, the risk of damaging the edges of the cast metal strand is avoided.

In the case of asymmetric rollers, too, the outer balls preferably extend by at least 30 mm—in particular by at least 40 mm—beyond the minimum width inward toward the segment center line. As with symmetrical rolls, this avoids the risk of damaging the edges of the cast metal strand.

FIG 1

eine Stranggießanlage,

FIG 2

einen Querschnitt durch einen gegossenen brammenförmigen Metallstrang längs einer Linie II-II in FIG 1,

FIG 3

einen Längsschnitt durch eine Kokille längs einer Linie III-III in FIG 1,

FIG 4

einen Teil einer Strangführung,

FIG 5 bis 8

mögliche Ausgestaltungen von Rollen, die sich an einem Segmentteil abstützen,

FIG 9

eine angetriebene Rolle,

FIG 10

eine nicht angetriebene Rolle und

FIG 11 und 12

je einen Querschnitt durch eine Strangführung einschließlich Metallstrang längs einer Linie XI-XI bzw. XII-XII in FIG 4.

The characteristics, features and advantages of this invention described above, and the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the exemplary embodiments, which are explained in more detail in connection with the drawings. This shows in a schematic representation:

FIG 1

a continuous caster,

FIG 2

a cross section through a cast slab-shaped metal strand along a line II-II in FIG 1 ,

3

a longitudinal section through a mold along a line III-III in FIG 1 ,

FIG 4

a part of a strand guide,

5 to 8

possible configurations of roles that are supported on a segment part,

9

a driven roller,

10

a non-powered roller and

11 and 12

a cross section through a strand guide including metal strand along a line XI-XI or XII-XII in FIG 4 .

According to FIG 1 a continuous casting plant has a mold 1 and a strand guide 2 . The strand guide 2 is the mold 1 downstream. Liquid metal 3 - for example steel or aluminum - is poured into the mold 1 . The liquid metal 3 solidifies on the contact surfaces of the mold 1 and is drawn off from the mold 1 in a strand conveying direction x by means of the strand guide 2 as a slab-shaped metal strand 4—usually with a core that is still liquid. The metal strand 4 has according to FIG 2 transverse to the strand conveying direction x has a strand width bS. The strand width bS lies between a minimum width bmin and a maximum width bmax. The minimum width bmin and the maximum width bmax are determined in particular by the construction of the mold 1. For example, as shown in 3 Narrow sides 5 of the mold 1 can be adjusted by means of adjusting devices 6 (usually hydraulic cylinder units). In this case, the range within which the narrow sides 5 can be adjusted by the adjusting devices 6 determines the minimum width bmin and the maximum width bmax.

The strand guide 2 has according to FIG 1 several segments 7 on. The segments 7 follow one another sequentially in the strand conveying direction x. The strand conveying direction x runs as shown in FIG FIG 1 usually initially vertical or nearly vertical. The strand conveying direction x changes in the casting curve as shown in FIG 1 usually their absolute direction in space gradually further and further in the horizontal direction.

The segments 7 have according to the FIG 1 and 4 each have an inner segment part 8 and an outer segment part 9 . The outer segment part 9 is usually stationary within the continuous casting plant. The inner segment part 8 is generally movable relative to the outer segment part 9 . The positioning of the segment parts 8, 9 against each other can be done, for example, by means of hydraulic cylinder units, not shown. In arch systems, the inner segment part 8 is located on the side of the metal strand 4, which forms the upper side after the metal strand 4 has been bent into the horizontal. The outer segment part 9 is therefore that segment part which is located on the side of the metal strand 4 in the case of sheet systems, which forms the underside of the metal strand 4 after the metal strand 4 has been bent into the horizontal. The metal strand 4 is guided between the two segment parts 8 , 9 of the respective segment 7 . The segment parts 8, 9 also each have a plurality of rollers 10. The rollers 10 follow one another sequentially in the strand conveying direction x. The rollers 10 guide and support the cast metal strand 4.

According to the representation in FIG 4 be able the segment parts 8, 9 each have seven rollers 10, for example. However, this number is purely exemplary. The number of rollers 10 per segment 8, 9 could also be greater than seven or less than seven. However, the number of rollers 10 per segment 8, 9 is usually a minimum of four and a maximum of 20. The rear construction of the segment parts for supporting the rollers shown is not shown in detail, but this can be found, for example, in the "SMART Segment & DynaGap SoftReduction" brochure. of Siemens VAI Metals Technologies from 2007.

5 shows a plan view of the rollers 10, which is located on one of the two segment parts 8, 9 of FIG 4 support. 5 additionally shows the last roll 10 of the corresponding segment part 8, 9 of the immediately preceding segment 7 and the first roll 10 of the corresponding segment part 8, 9 of the immediately following segment 7. The boundaries of the fully shown segment part 8, 9 are in 5 indicated by horizontal dashed lines.

According to the representation in 5 the rollers 10 have a total extension G. The overall extent G is—as is generally customary—chosen in such a way that it exceeds the maximum width bmax to a sufficient extent—for example by approximately 50 mm to approximately 80 mm. Furthermore, the rollers 10 are each divided into a plurality of bales 11 viewed transversely to the strand conveying direction x. There is a gap 12 in each case between the barrels 11 of the respective roll 10. The gaps 12 have a respective gap width bL. The gap widths bL are usually in the range from about 60 mm to about 150 mm. In the area of the gaps 12 takes place - in addition to the outer roller bearings - an additional storage and support of the rollers 10. In 5 the bales 11 and the gaps 12 and also the gap widths bL are provided with reference numbers only for the last roll 10 of the corresponding segment part 8, 9 of the immediately preceding segment 7 and the first roll 10 of the corresponding segment part 8, 9 of the immediately following segment 7. The corresponding assignment is off 5 but also for the rollers 10 of the segment part 8, 9 shown in full.

the inside 5 The set of rollers shown for a segment part 8, 9 has (at least) one symmetrical roller 10. This roller 10 is usually driven or can be driven. this is in 5 indicated by the fact that this roller 10 is assigned a drive 13 . The difference between a driven roller 10 and a drivable roller 10 is that a driven roller 10 is firmly connected to its associated drive 13, while a drivable roller 10 is detachably connected to its associated drive 13, in particular via a detachable coupling that is only indicated 13'.

In this case - i.e. if at least one symmetrical roller 10 is present - as shown in 5 Viewed transversely to the strand conveying direction x, not a single roll 10 has the gaps 12 in the same places as in the immediately following roll 10. This also applies to the last roll 10 of the in 5 fully illustrated segment part 8, 9. As will be seen from the following explanations, this configuration can be realized regardless of whether the number of rollers 10 of the corresponding segment part 8, 9 is even or odd. The offset V of the gaps 12 relative to one another is in particular greater than the respective gap width bL.

In particular, in the case of the symmetrical roller 10 - this generally applies to all symmetrical rollers 10 of all segment parts 8, 9 - the gaps 12 of the respective roller 10 are arranged symmetrically to the casting center line 14 or segment center line 14 viewed transversely to the strand conveying direction x. The two terms "casting center line" and "segment center line" are used synonymously below. The casting center line 14 is that line seen transversely to the strand conveying direction x, with respect to which the overall extension G of the rollers 10 is evenly distributed. The division of the symmetrical roll 10 into its individual balls 11 is preferably chosen such that the outer balls 11 of the symmetrical roll 10 extend at least 30 mm - preferably at least 40 mm - over the minimum width bmin inwards onto the pouring center line 14. This ensures that the outer bales 11 of the symmetrical roll 10 also convey the metal strand 4, regardless of the actual strand width bS. This also applies when the metal strand 4 is conveyed slightly eccentrically or slightly askew in the strand guide 2 .

In the other rollers 10, the gaps 12 of the respective roller 10 are arranged asymmetrically to the casting center line 14, viewed transversely to the strand conveying direction x. These rollers 10, ie the asymmetrical rollers 10, are not driven as a rule. Out of 5 it can also be seen that in each pair of immediately consecutive asymmetrical rolls 10, the barrels 11 of one roll 10 correspond to the barrels 11 of the other roll 10 in inverse order.

Out of 5 it can also be seen that the offset V of the gaps 12 relative to the gaps 12 of the immediately following roller 10 is at least 10 mm greater than the gap width bL. Starting from a specific gap 12 of a specific roll 10, not only is this gap 12 covered by a bale 11 of the immediately following roll 10, but there is also a distance between the gaps 12 immediately following one another in the strand conveying direction x of at least 10 mm .

As a rule, as seen in the strand conveying direction x, the first roller 10 of the respective segment part 8, 9 and the penultimate roller 10 of the respective segment part 8, 9 are identically designed asymmetrical rollers 10. The second roller is generally also seen in the strand conveying direction x 10 of the respective segment part 8, 9 and the last roller 10 of the respective segment part 8, 9 are asymmetric rollers of the same design 10. This results in the property that, seen transversely to the strand conveying direction x, the gaps 12 of the first roll 10 of a respective segment part 8, 9, seen in strand conveying direction x, are larger than the gaps 12 of the last roll 10 of the same segment part 8, 9, seen in strand conveying direction x are offset than the respective gap width bL. This results in the advantage that segment parts 8, 9 directly following one another in the strand conveying direction x can be of the same design. Nevertheless, it is still guaranteed that, viewed transversely to the strand conveying direction x, the gaps 12 of the last roller 10 of a respective segment part 8, 9, viewed in the strand conveying direction x, compared to the gaps 12 of the first roller 10 of the immediately following segment part 8, 9, viewed in the strand conveying direction x, by more than the respective gap width bL are offset.

In the case of the asymmetrical rollers 10, too, the division of the rollers 10 into their individual barrels 11 is preferably selected in such a way that the outer barrels 11 of the non-driven rollers 10 widen inwards by at least 30 mm - preferably by at least 40 mm - beyond the minimum width bmin to extend the pouring centerline 14. This ensures in particular that, regardless of the actual strand width bS, the inner edges of the outer barrels 11 of the asymmetrical rollers 10 run on the metal strand 4 itself, but do not hit its outer edge exactly. This also applies when the metal strand 4 is conveyed slightly off-center or slightly crooked.

At the in 5 shown rollers of the segment part 8, 9 correspond in each pair of immediately consecutive asymmetrical rollers 10, the barrels 11 of one roller 10 in pairs with the barrels 11 of the other roller 11 in inverse order, so seen once from the left and from the right. Furthermore, the in 5 shown segment part 8, 9 only a single symmetrical role 10 on. This configuration is the norm. If the segment part 8, 9 has several symmetrical rollers 10, these rollers 10 are preferably not located at the borders of the upstream and downstream segment part 8, 9. Furthermore, in this case there is preferably at least at least one between symmetrical rollers 10 an asymmetric roll 10, in particular an even number of asymmetric rolls 10.

The design of the roller set of the segment part 8, 9 according to 6 as such is not the subject of the present invention. the inside 6 shown segment part 8, 9 has in contrast to 5 no symmetrical role 10 on. The number of rolls 10 of the in 6 shown segment part 8, 9 is straight. In this case--that is, if there is no symmetrical roller 10 but the number of rollers 10 is even--as shown in FIG 6 Seen transversely to the strand conveying direction x, not a single roll 10 has the gaps 12 in the same places as in the immediately following roll 10. This also applies to the last roll 10 of the in 6 Completely illustrated segment part 8, 9. You can look at the in 6 imagine the segment part 8, 9 shown as if the 5 represented segment part 8, 9 would have been shortened by the symmetrical roller 10. The above statements on the asymmetrical roles 10 of 5 are therefore 1:1 6 transferable.

The design of the roller set of the segment part 8, 9 according to FIG 7 as such is also not the subject of the present invention. the inside FIG 7 The segment part 8, 9 shown, like that in 6 shown system part 8, 9 no symmetrical role 10 on. In contrast to 6 is the number of rolls 10 of the in FIG 7 shown segment part 8, 9 but odd. In this case - i.e. if there is no symmetrical roller 10 and the number of rollers 10 is also odd - it is often unavoidable for design reasons that, as shown in FIG 7 Seen transversely to the strand conveying direction x, the gaps 12 in a roll 10 are in the same places as in the immediately following roll 10 . Exactly this can be avoided by the configuration according to the invention, in which there is at least one symmetrical roller 10 per segment part 8 , 9 .

According to the representation in FIG 7 the gaps 12 are only in a single roll 10 in the same places as in the immediately following roll 10. In all other rolls 10 of the corresponding segment part 8, 9, the gaps 12 of the respective roll 10 are opposite the gaps 12 of the immediately following roll 10 offset by more than the respective gap width bL. When designing FIG 7 is that roll 10 in which the gaps 12 are located at the same points transversely to the strand conveying direction x as the gaps 12 of the roll 10 immediately downstream, seen in the strand conveying direction x, the middle roll 10 of the corresponding segment part 8, 9. Alternatively, it would be corresponding the representation in 8 possible that it is the middle roller 10 of the corresponding segment part 8, 9 immediately preceding roller 10. The configuration of the segment part 8, 9 according to 8 as such is also not the subject of the present invention.

Also with the in the FIG 7 and 8th For those rollers 10 that are themselves asymmetrical and whose immediately downstream roller 10 is also asymmetrical, the rollers of the segment parts 8, 9 shown correspond in pairs with the rollers 11 of the respective roller 10 with the rollers 11 of the immediately following roller 11. Regarding the two directly consecutive ones Rolls 10 in which the gaps 12 between the bales 11 are located at the same points transversely to the strand conveying direction x, the bales 11 correspond to one another in the same order. In the case of the remaining non-driven rollers 10, the bales 11 correspond to one another in reverse order.

In the 6 , 7 and 8th are only the rolls 10 provided with reference numbers themselves. However, the division of the rolls 10 into the bales 11 and the arrangement of the gaps 12 is readily apparent from the representation in FIGS 6 , 7 and 8th even.

The barrels 11 of the rolls 10 each have a barrel length 11, L1, 12, L2. With l1 is here - see 9 - Denotes the minimum barrel length of a symmetrical roll 10, with L1 the maximum barrel length of a symmetrical roll 10. In an analogous manner - see 10 - 12 designates the minimum barrel length of an asymmetric roll 10, L2 the maximum barrel length of an asymmetric roll 10. Furthermore, the barrels 11 of the rolls 10 have a respective roll diameter d1, d2. With d1 is here - see 9 - denotes the diameter of the balls 11 of a symmetrical roll 10, with d2 - see 10 - The diameter of the barrel 11 of an asymmetric roll 10. The respective roll diameter d1, d2 is uniform for the barrel 11 of the respective roll 10.

All symmetrical rollers 10 within the respective segment part 8, 9 preferably have the same roller diameter d1. In an analogous manner, all asymmetrical rollers 10 within the respective segment part 8, 9 preferably also have the same roller diameter d2. The roll diameter d1 of the symmetrical rolls 10 is preferably at least as - usually larger than - the roll diameter d2 of the asymmetrical rolls 10. Viewed in the strand conveying direction x, the roll diameters d1, d2 increase from segment 7 to segment 7 (or at least not smaller).

The maximum barrel length L1, L2 is preferably between 3 times and 4.5 times the respective roll diameter d1, d2. In particular, according to 9 in the case of symmetrical rolls 10, the maximum barrel length L1 is preferably between 3 and 3.8 times the respective roll diameter d1. In particular, in the case of symmetrical rollers 10, the maximum barrel length L1 can be between 3.2 times and 3.6 times the respective roller diameter d1, particularly preferably between 3.3 times and 3.5 times. In the case of asymmetrical rollers 10, on the other hand, the ratio of maximum barrel length L2 and diameter d2 can have a larger value. In particular, according to 10 in the case of asymmetrical rolls 10, the maximum barrel length L2 is preferably between 3.5 times and 4.5 times the respective roll diameter d2. In particular, in the case of asymmetrical rollers 10, the maximum barrel length L2 can be between 3.7 times and 4.3 times the respective roller diameter d1, particularly preferably between 3.9 times and 4.1 times. Furthermore, the maximum bale length L1, L2 should not exceed an absolute value. The absolute value is usually in the range between 750 mm and 900 mm, in particular between 800 mm and 850 mm.

Likewise, the minimum bale length 11, 12 should not fall below an absolute value. The absolute value is usually between 200 mm and 350 mm, mostly around 250 mm to 300 mm.

For constructional reasons - as well as in the 5 to 8 shown - preferably that, based on the respective roll 10, either all bales 11 of the respective roll 10 have a uniform bale length 11, L1, 12, L2 or only a single bale 11 has a different bale length 11, L1, from the other bales 11, 12, L2.

With a symmetrical roller 10, for example, as shown in 5 the two outer bales 11 have a uniform (large) bale length L1, with inner bales 11--if they are also present--either having the same bale length L1 or a smaller bale length 11. With an asymmetrical role 10, for example, as shown in the 5 to 8 one of the two outer balls 11 have a relatively small ball length 12, while all other balls 11 of the same roll 10 have a larger ball length L2. The reverse procedure (one long bale 11 per roll 10, otherwise short bales 11) is also possible.

How out FIG 4 As can be seen, the inner and outer segment parts 8, 9 of a respective segment 7 have an equal number of rollers 10. Furthermore, based on the cast metal strand 4, the rollers 10 of the inner and outer segment parts 8, 9 can be seen opposite one another. As a rule, as far as the present invention is concerned, the inner segment part 8 is a mirror image of the outer segment part 9. For example, as in 11 for one roller 10 each of the inner and outer segment part 8, 9 of a segment 7, seen transversely to the strand conveying direction x, the gaps 12 between the barrels 11 of the rollers 10 of the inner segment part 8 are in the same places as the gaps 12 between the barrels 11 the respectively opposite roller 10 of the outer segment part 9 are located. Furthermore, in those rollers 10 of the inner and outer segment part 8, 9 which are designed as symmetrical rollers 10, the opposite roller 10 of the outer or inner segment part 9, 8 is also designed as a symmetrical roller 10. In accordance with the design 11 ie the barrels 11 of the rollers 10 of the inner segment part 8 correspond to the barrels 11 of the respectively opposite roller 10 of the outer segment part 9 in the same order. Alternatively it is according to 12 possible that the balls 11 of the rollers 10 of the inner segment part 8 correspond to the balls 11 of the respectively opposite roller 10 of the outer segment part 9 in reverse order.

Above were in connection with the 5 to 12 Configurations of rollers of segment parts 8, 9 explained, in which the rollers 10 each have three barrels 11 according to the invention. However, the rollers 10 could also each have four and in some cases even five bales 11 .

Reference List

1

mold

2

strand guide

3

liquid metal

4

metal strand

5

narrow sides

6

adjusting devices

7

segments

8th

inner segment part

9

outer segment part

10

roll

11

bale

12

Gaps

13

drive

13'

coupling

14

Pour Centerline/Segment Centerline

bS, bmin, bmax

strand widths

bL

gap width

d1, d2

roll diameter

G

overall extent

l1, l1, l2, l2

bale lengths

V

offset

x

strand conveying direction

Claims (14)

1. Segment of a strand guide (2) of a continuous casting installation,

   - wherein the segment (7) has an inner and an outer segment part (8, 9), between which a metal strand (4) is guided during operation,

   - wherein the segment parts (8, 9) each have a plurality of rollers (10) that sequentially follow one another in a strand conveying direction (x) and are supported on the respective segment part (8, 9),

   - wherein the rollers (10) are each subdivided, as seen transversely to the strand conveying direction (x), into a plurality of barrels (11), between each of which there is a gap (12) that has a respective gap width (bL),

   wherein,

   - as seen transversely to the strand conveying direction (x), for each segment part (8, 9), the gaps (12) of the rollers (10) are offset by more than the respective gap width (bL) with respect to the gaps (12) of the respectively immediately successive roller (10),

   - in the case of at least one of the rollers (10) of the respective segment part (8, 9), the gaps (12) of the respective roller (10) are arranged symmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x),

   - in the case of the other rollers (10) of the respective segment part (8, 9), the gaps (12) of the respective roller (10) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), and

   - in each pair of immediately successive rollers (10) of the respective segment part (8, 9), in which the gaps (12) of both rollers (10) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), the barrels (11) of one roller (10) correspond in reverse order to the barrels (11) of the other roller (10),

   wherein, furthermore,

   - as seen in the strand conveying direction (x), both in the case of the first and in the case of the last roller (10) of the respective segment part (8, 9), the gaps (12) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x),

   - the rollers (10) each have three, four or five barrels (11),

   - the barrels (11) have a respective barrel length (l1, L1, l2, L2),

   - in the case of the rollers (10) in which the gaps (12) are arranged symmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), either all the barrels (11) have a unitary barrel length (L1) or only one barrel (11) has a different barrel length (l1, l2, L2) from the other barrels (11), and

   - in the case of the rollers (10) in which the gaps (12) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), only one barrel (11) has a different barrel length (l1, l2, L2) from the other barrels (11).
2. Segment according to Claim 1,
   characterized
   in that, with regard to each roller (10) in which the gaps (12) are arranged symmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), both the gaps (12) of the immediately upstream roller (10) and the gaps (12) of the immediately downstream roller (10) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x).
3. Segment according to Claim 1 or 2,
   characterized
   in that the barrels (11) of the first roller (10), as seen in the strand conveying direction (x), of the respective segment part (8, 9) correspond in reverse order to the barrels (11) of the last roller (10), as seen in the strand conveying direction (x), of the respective segment part (8, 9).
4. Segment according to one of the preceding claims,
   characterized
   in that the rollers (10) of the respective segment part (8, 9), in which the gaps (12) of the respective roller (10) are arranged symmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), are each assigned a drive (13) fixedly or via a coupling (13') .
5. Segment according to one of the preceding claims,
   characterized
   in that the offset (V) of the gaps (12) with respect to the gaps (12) of the respectively immediately successive roller (10) is at least 10 mm greater than the gap width (bL).
6. Segment according to one of the preceding claims,
   characterized
   in that the barrels (11) of the rollers (10) have a respective maximum barrel length (L1, L2) and a unitary roller diameter (d1, d2) for the barrels (11) of the respective roller (10), and in that the respective maximum barrel length (L1, L2) is between 3 and 4.5 times the respective roller diameter (d1, d2) .
7. Segment according to Claim 6,
   characterized
   in that the respective maximum barrel length (L1, L2) in rollers (10) in which the gaps (12) are arranged symmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x) is between 3 and 3.8 times the respective roller diameter (d1), and in rollers (10) in which the gaps (12) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x) is between 3.5 and 4.5 times the respective roller diameter (d2).
8. Segment according to one of the preceding claims,
   characterized
   in that the barrels (11) have a respective barrel length (11, L1,l2, L2), and in that the barrel length (l1, L1, l2, L2) is at least 250 mm and at most 900 mm.
9. Segment according to one of the preceding claims,
   characterized
   in that the rollers (10) in which the gaps (12) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x) have a unitary roller diameter (d2).
10. Segment according to Claim 9,
    characterized
    in that the rollers (10) of the respective segment part (8, 9), in which the gaps (12) are arranged symmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), have a unitary roller diameter (d1), and in that this roller diameter (d1) is greater than the roller diameter (d2) of the rollers (10) in which the gaps (12) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x).
11. Segment according to one of the preceding claims,
    characterized
    in that the inner and the outer segment part (8, 9) have an identical number of rollers (10), in that, with regard to the metal strand (4), the rollers (10) of the inner and of the outer segment part (8, 9) are located opposite one another, and in that, as seen transversely to the strand conveying direction (x), the barrels (11) of the rollers (10) of the inner segment part (8) correspond in the same order or in reverse order to the barrels (11) of the respectively opposite roller (10) of the outer segment part (9).
12. Continuous casting installation,

    - wherein the continuous casting installation has a mould (1) and a strand guide (2) arranged downstream of the mould (1),

    - wherein, by means of the mould (1), a metal strand (4) in the form of a slab is cast, said metal strand (4) being drawn out of the mould (1) in a strand conveying direction (x) by means of the strand guide (2),

    - wherein the metal strand (4) has a strand width (bS), as seen transversely to the strand conveying direction (x), that is between a minimum width (bmin) and a maximum width (bmax),

    - wherein the minimum width (bmin) and the maximum width (bmax) are determined by the construction of the mould (1),

    - wherein the strand guide (2) has a plurality of segments (7), according to one of the preceding claims, that sequentially follow one another in the strand conveying direction (x).
13. Continuous casting installation according to Claim 12,
    characterized
    in that, in the case of rollers (10) in which the gaps (12) are arranged symmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), the outer barrels (11) extend inwardly towards the segment centreline (14) by at least 30 mm over the minimum width (bmin).
14. Continuous casting installation according to Claim 12 or 13,
    characterized
    in that, also in the case of rollers (10) in which the gaps (12) are arranged asymmetrically with respect to the segment centreline (14) as seen transversely to the strand conveying direction (x), the outer barrels (11) extend inwardly towards the segment centreline (14) by at least 30 mm over the minimum width (bmin).

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