EP3097995A1 - Avoiding of water lanes in a strand guide - Google Patents

Abstract

A segment (7) of a strand guide (2) of a continuous casting plant has an inner and an outer segment part (8, 9), between which a metal strand (4) is guided during operation. The segment parts (8, 9) each have a plurality of rollers (10) which follow each other sequentially in the strand conveying direction (x) and which are supported on the respective segment part (8, 9). The rollers (10) are seen transversely to the strand conveying direction (x) each divided into a plurality of bales (11), between each of which there is a gap (12) having a respective gap width (bL). Seen transversely to the strand conveying direction (x), 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 following roller (10) per segment part (8, 9). In at least one of the rollers (10) of the respective segment part (8, 9), the gaps (12) of the respective roller (10), viewed transversely to the strand conveying direction (x), are arranged symmetrically to the segment center line (14). In the other of the rollers (10) of the respective segment part (8, 9), the gaps (12) of the respective roller (10), viewed transversely to the strand conveying direction (x), are arranged asymmetrically with respect to the segment center line (14). In each pair of immediately consecutive rollers (10) of the respective segment part (8, 9), in which the gaps (12) of both rollers (10) are arranged transversely to the strand conveying direction (x) asymmetrically to the segment center line (14), the bales correspond ( 11) of one roller (10) with the bale (11) of the other roller (10) in inverse order.

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,

• the segment having 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 sequentially sequential in a strand conveying direction, which are supported on the respective segment part,
• wherein the rollers are seen transversely to the strand conveying direction each divided into a plurality of bales, between each of which there is a gap having 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 further based on a continuous casting plant,

• wherein the continuous casting plant has a mold and a downstream of the mold, vertical or arcuate, strand guide,
• wherein by means of the mold, a slab-shaped metal strand is cast, which is withdrawn by means of the strand guide in a strand conveying direction from the mold,
• the metal strand having, viewed transversely to the strand conveying direction, a strand width which lies between a minimum width and a maximum width,
• wherein the minimum width and the maximum width are determined by the construction of the mold,
• wherein the strand guide has a plurality of sequentially sequential segments 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 roles in a strand guide a continuous casting is known, between which a metal strand can be performed during operation. It remains unclear whether and if yes, which one of the FIGS. 1 . 3 and 4 are shown roles associated with 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.

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

In older continuous casting plants, the rolls are often formed as continuous rolls, i. the rollers have a single bale that extends beyond the maximum width and still beyond. A support of the rollers is seen in this construction transversely to the strand conveying direction only at the ends of the rollers possible. The metallostatic pressure therefore leads to a relatively large deflection of the rollers. In younger continuous casting plants, the rolls are often subdivided, i. they have seen across the strand conveying direction several bales. In the gap between each two adjacent bales is a support, typically in the form of a roller or ball bearing. As a result, the deflection of the rollers can be significantly reduced. It is possible that, viewed transversely to the strand conveying direction, the gaps between the bales are in the same place.

The cast metal strand is cooled intensively in the continuous casting plant. On the one hand, cooling of the continuous casting mold (primary cooling) already takes place. 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, by the contact with the roller bales also carried a removal of heat from the metal strand.

Heat removal via the roller bales occurs to a different extent than cooling by water or the water-air mist.

If according to the doctrine of EP 1 767 289 A2 possible transverse to the strand conveying direction per segment part, the gaps of the rollers are offset from the gaps of each immediately subsequent role by more than the respective gap width, in particular a uniform cooling of the cast metal strand can be achieved. Also, continuous lanes along which water can drain down the metal string can be avoided.

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

The object is achieved by a segment having the features of claim 1. Advantageous embodiments of the segment according to the invention are the subject of the dependent claims 2 to 13.

• dass quer zur Strangförderrichtung gesehen pro Segmentteil die Lücken der Rollen gegenüber den Lücken der jeweils unmittelbar nachfolgenden Rolle um mehr als die jeweilige Lückenbreite versetzt sind,
• dass bei mindestens einer der Rollen des jeweiligen Segmentteils die Lücken der jeweiligen Rolle quer zur Strangförderrichtung gesehen symmetrisch zur Segmentmittellinie angeordnet sind,
• dass bei den anderen der Rollen des jeweiligen Segmentteils die Lücken der jeweiligen Rolle quer zur Strangförderrichtung gesehen asymmetrisch zur Segmentmittellinie angeordnet sind und
• dass bei jedem Paar unmittelbar aufeinanderfolgender Rollen des jeweiligen Segmentteils, bei denen die Lücken beider Rollen quer zur Strangförderrichtung gesehen asymmetrisch zur Segmentmittellinie angeordnet sind, die Ballen der einen Rolle mit den Ballen der anderen Rolle in inverser Reihenfolge korrespondieren.

According to the invention a strand guide segment of the type mentioned is configured by

• that, viewed transversely to the strand conveying direction, the gaps of the rollers are offset by more than the respective gap width in relation to the gaps of the respectively immediately following roller per segment part,
• in that, in at least one of the rollers of the respective segment part, the gaps of the respective roller, viewed transversely to the strand conveying direction, are arranged symmetrically with respect to the segment center line,
• that in the other of the rollers of the respective segment part, the gaps of the respective roller are arranged transversely to the strand conveying direction asymmetrical to the segment center line and
• that in each pair of immediately consecutive roles of the respective segment part, in which the gaps of both roles Seen transversely to the strand conveying direction are arranged asymmetrically to the segment center line, the bales of a role correspond to the bale of the other role in inverse order.

By the roles of the respective segment part, in which the gaps of the respective roll are arranged transversely to the strand conveying direction symmetrical to the segment centerline (hereinafter referred to as symmetrical roles) a particularly reliable and secure guidance of the cast, usually slab-shaped, metal strand is effected. Due to the correspondence of the bales of immediately successive rolls, in which the gaps in the rolls are arranged transversely to the strand conveying direction asymmetrical to the segment center line (hereinafter called short asymmetric rolls), the asymmetric rolls are as such uniform to each other and only rotated by 180 °.

By assigning a plurality of sequential in the strand conveying direction sequential roles to an inner or outer segment part, it is possible to expand the existing of the inner and outer segment part strand guide segment regardless of the upstream or downstream areas of the strand guide. In addition, the metallurgical length of the continuous casting machine can be easily and quickly changed by adding or removing strand guiding segments.

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

Preferably, viewed in the strand conveying direction, both in the first and in the last roll of the respective segment part, the gaps transversely to the strand conveying direction are asymmetrical arranged to the segment centerline. It can thereby be achieved that, in the case of a sequence of consecutive identical segments, the last roll of one segment forms a pair of rolls with the first roll of the following segment, in which the gaps of both rolls are arranged asymmetrically to the segment center line, viewed transversely to the strand conveying direction, and furthermore Bales of one roll correspond to the bales of the other roll in inverse order.

Preferably, with regard to each symmetrical roller, both the gaps of the directly upstream and the gaps of the immediately downstream roller, as seen transversely to the strand conveying direction, are arranged asymmetrically with respect to the segment center line. This avoids that symmetrical rollers follow each other directly.

Preferably, the bales of the first roll of the respective segment part seen in the strand conveying direction correspond with the bales of the last roll of the respective segment part seen in the strand conveying direction in inverse sequence. As a result, a sequence of identical segments can be formed, with the offset of the gaps remaining from roll to roll not only within the respective segment but also at the segment transition.

The symmetrical rollers of the respective segment part are preferably each assigned a drive fixedly or via a coupling. This embodiment optimizes the reliable guidance of the cast metal strand.

Preferably, the offset of the gaps with respect to the gaps of the respectively immediately following roll is at least 10 mm larger than the gap width. This causes a sufficient interruption of the continuous lanes with great certainty.

The bales of the rollers have a respective maximum bale length. Furthermore, they have a roll diameter uniform for the bales of the respective roll. Preferably lies the respective maximum bale length between 3 times and 4.5 times the respective roll diameter. By this configuration, on the one hand minimizes the number of bales per role and on the other hand held the deflection of the rollers at a low level. In particular, the respective maximum bale length for symmetrical rollers is preferably between 3 times and 3.8 times the respective roller diameter and, in the case of asymmetrical rollers, between 3.5 times and 4.5 times the respective roller diameter.

For symmetrical rollers, either all bales preferably have a uniform bale length, or only a single bale has a bale length different from the other bales. In asymmetric rolls, preferably only a single bale has a different bale length than the other bales. This embodiment simplifies the design of the segment.

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

Preferably, the asymmetric rollers have a uniform roll diameter. As a result, rollers of identical construction can be used for the asymmetrical rollers.

Preferably, furthermore, the symmetrical rollers of the respective segment part also have a uniform roller diameter. This also makes it possible to use identical rollers for the symmetrical rollers as well. However, the roll diameter of the symmetrical rolls is preferably larger than the roll diameter of the asymmetric rolls.

As a rule, the inner and the outer segment part have an equal number of rollers, wherein, based on the metal strand, the rollers of the inner and the outer segment part face each other. Preferably, the bales of the rollers of the inner correspond transversely to the strand conveying direction Segment part with the bale of the opposite role of the outer segment part in the same order or in inverse order. As a result, a particularly stable support of the metal strand can be effected.

The object is further achieved by a continuous casting with the features of claim 14. Advantageous embodiments of the continuous casting plant according to the invention are the subject of the dependent claims 15 and 16.

According to the invention, a continuous casting plant of the type mentioned above is configured in that the segments are configured according to the invention.

In the case of symmetrical rollers, the outer bales preferably extend at least 30 mm, in particular by at least 40 mm, over the minimum width inwards toward the segment center line. This design ensures a reliable guidance and promotion of the metal strand. At the same time the risk of damaging the edges of the cast metal strand is avoided.

Preferably, even with asymmetric rollers, the outer bales extend at least 30 mm, in particular by at least 40 mm, over the minimum width inwards toward the segment center line. As a result, the risk of damage to the edges of the cast metal strand is avoided - as well as symmetrical roles.

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 above-described characteristics, features and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the embodiments, which will be described in more detail in conjunction with the drawings. Here are shown in a schematic representation:

FIG. 1

a continuous casting plant,

FIG. 2

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

FIG. 3

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

FIG. 4

a part of a strand guide,

FIGS. 5 to 8

possible embodiments of rollers, which are supported on a segment part,

FIG. 9

a powered roller,

FIG. 10

a non-driven roller and

FIGS. 11 and 12

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

According to FIG. 1 For example, a continuous casting plant has a mold 1 and a strand guide 2. The strand guide 2 is arranged downstream of the mold 1. In the mold 1, liquid metal 3 - for example steel or aluminum - is poured. The liquid metal 3 solidifies at the contact surfaces of the mold 1 and is withdrawn by means of the strand guide 2 as a slab-shaped metal strand 4 - usually with still liquid core - in a strand conveying direction x from the mold 1. The metal strand 4 has according to FIG. 2 transverse to the strand conveying direction x on a strand width bS. The strand width bS is 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 FIG FIG. 3 Narrow sides 5 of the mold 1 by means of adjusting 6 (usually hydraulic cylinder units) be adjustable. In this case, determines the range within which the narrow sides 5 are adjustable by the adjustment 6, 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 near vertical. The strand conveying direction x changes in the pouring arc as shown in FIG FIG. 1 usually their absolute direction in space gradually progressively in the horizontal direction.

The segments 7 have according to the FIG. 1 and 4 in each case an inner segment part 8 and an outer segment part 9. The outer segment part 9 is usually stationary within the continuous casting. The inner segment part 8 is movable relative to the outer segment part 9 as a rule. The hiring the segment parts 8, 9 against each other can be done for example by means not shown hydraulic cylinder units. In sheet systems, the inner segment part 8 is located on the side of the metal strand 4, which forms after bending of the metal strand 4 in the horizontal its upper side. The outer segment part 9 is therefore the one segment part which is located at bow systems on the side of the metal strand 4, which forms after bending of the metal strand 4 in the horizontal of the underside. Between the two segment parts 8, 9 of the respective segment 7 of the metal strand 4 is guided. The segment parts 8, 9 furthermore 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.

As shown in FIG. 4 For example, the segment parts 8, 9 each have seven rollers 10. 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. The number of rollers 10 per segment 8, 9 is, however, usually at least four and a maximum of 20. The rear construction of the segment parts for supporting the roles shown is not shown in detail, but this is, for example, from the brochure "SMART Segment & DynaGap SoftReduction" of Siemens VAI Metals Technologies from 2007 known.

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

As shown in FIG. 5 the rollers 10 have an overall extension G. The overall extent G is - as is common practice - chosen such that it exceeds the maximum width bmax to a sufficient extent - for example, by about 50 mm to about 80 mm. Furthermore, the rollers 10 are viewed transversely to the strand conveying direction x divided into several bales 11. There is in each case a gap 12 between the bales 11 of the respective roller 10. The gaps 12 have a respective gap width bL. The gap widths bL are generally in the range of about 60 mm to about 150 mm. In the area of the gaps 12 takes place - in addition to outer roller bearings - an additional storage and support of the rollers 10. In FIG. 5 the bales 11 and the gaps 12 and the gap widths bL are provided with reference numerals 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 FIG. 5 However, also for the rollers 10 of the fully illustrated segment part 8, 9 readily apparent.

The in FIG. 5 shown roller set of a segment part 8, 9 has (at least) a symmetrical roller 10. This roller 10 is usually driven or driven. This is in FIG. 5 indicated that this roller 10, a drive 13 is associated. The difference between a driven roller 10 and a drivable roller 10 is that a driven roller 10 is fixedly connected to its associated drive 13, while a drivable roller 10 is releasably connected to its associated drive 13, in particular via an only indicated releasable coupling 13 '.

In this case - if at least one symmetrical roller 10 is present - are located as shown in FIG. 5 Seen transversely to the strand conveying direction x at a single roller 10, the gaps 12 at the same locations as in the immediately following roll 10. This also applies to the last roll 10 of in FIG. 5 This embodiment is, as will be apparent from the following statements, 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 against each other is in particular greater than the respective gap width bL.

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

In the case of the other rollers 10, the gaps 12 of the respective roller 10, viewed transversely to the strand conveying direction x, are arranged asymmetrically with respect to the casting center line 14. These rollers 10, so the asymmetric rollers 10 are not driven in the rule. Out FIG. 5 It can also be seen that in each pair of immediately successive asymmetric rollers 10 the Bales 11 of a roll 10 correspond to the bale 11 of the other roll 10 in inverse order.

Out FIG. 5 It can also be seen that the offset V of the gaps 12 with respect to the gaps 12 of the immediately following roller 10 is at least 10 mm greater than the gap width bL. It is thus, starting from a certain gap 12 of a particular roll 10, not only this gap 12 covered by a bale 11 of the immediately following roll 10, but there is also a distance in the strand conveying direction x directly consecutive gaps 12 of at least 10 mm from each other ,

As a rule, the first roller 10 of the respective segment part 8, 9 and the penultimate roller 10 of the respective segment part 8, 9 are asymmetrically shaped asymmetrical rollers 10 in the same way as seen in the strand conveying direction x 10 of the respective segment part 8, 9 and the last roll 10 of the respective segment part 8, 9 identically formed asymmetric rollers 10. Thus, the property results that seen transversely to the strand conveying direction x the gaps 12 seen in the strand conveying direction x first roller 10 of a respective segment part 8, 9 with respect to the gaps 12 seen in the strand conveying direction x last roller 10 of the same segment part 8, 9 are offset by more than the respective gap width bL. This results in the advantage that in the strand conveying direction x directly consecutive segment parts 8, 9 can be formed the same. Nevertheless, it remains ensured that seen transversely to the strand conveying direction x the gaps 12 seen in the strand conveying direction x last roller 10 of a respective segment part 8, 9 with respect to the gaps 12 in the strand conveying direction x seen first roller 10 of the immediately following segment part 8, 9 by more than the respective gap width bL are offset.

Even with the asymmetric rollers 10, the division of the rollers 10 in their individual bales 11 is preferably selected such that the outer bale 11 of the non-driven Rolls 10 to extend at least 30 mm - preferably by at least 40 mm - over the minimum width bmin inwardly on the casting center line 14. This ensures in particular that, irrespective of the actual strand width bS, the inner edges of the outer bales 11 of the asymmetrical rolls 10 run on the metal strand 4 itself, but do not meet exactly its outer edge. This also applies if the metal strand 4 is conveyed slightly eccentrically or slightly obliquely.

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

The embodiment of the roller set of the segment part 8, 9 according to FIG. 6 as such is not the subject of the present invention. The in FIG. 6 shown segment part 8, 9 has in contrast to FIG. 5 no symmetrical roller 10 on. The number of rolls 10 of in FIG. 6 shown segment part 8, 9 is straight. In this case - if, therefore, no symmetric roller 10 is present, but the number of rollers 10 is even - are located as shown in FIG. 6 transverse to the strand conveying direction x seen also in no single role 10, the gaps 12 at the same locations as in the immediately following roll 10. This also applies to the last roll 10 of in FIG. 6 completely shown segment part 8, 9. You can see the in FIG. 6 presented segment part 8, 9 so imagine as if the in FIG. 5 shown segment part 8, 9 would have been shortened to the symmetrical roller 10. The above statements on the asymmetric rollers 10 of FIG. 5 are therefore 1: 1 up FIG. 6 transferable.

The embodiment of the roller set of the segment part 8, 9 according to FIG. 7 as such is likewise not the subject of the present invention. The in FIG. 7 shown segment part 8, 9 has as well as in FIG. 6 shown system part 8, 9 no symmetrical roller 10 on. In contrast to FIG. 6 is the number of rolls 10 in FIG. 7 shown segment part 8, 9 but odd. In this case - if no symmetrical roller 10 is present and in addition the number of rollers 10 is odd - it is often unavoidable for constructional reasons that, as shown in FIG FIG. 7 Seen transversely to the strand conveying direction x in a roll 10, the gaps 12 at the same locations as in the immediately following roll 10. This is precisely what can be avoided by the design according to the invention, in which at least one symmetrical roller 10 is present per segment part 8, 9.

As shown in FIG. 7 Although only in a single role 10, the gaps 12 at the same locations as in the immediately following role 10. In all other roles 10 of the corresponding segment part 8, 9, the gaps 12 of the respective roller 10 against the gaps 12 of the immediately following role 10 offset by more than the respective gap width bL. In the embodiment of FIG. 7 is that role 10, in which the gaps 12 are seen transversely to the strand conveying direction x in the same places as the gaps 12 seen in the strand conveying direction x immediately downstream roll 10, the middle roll 10 of the corresponding segment part 8, 9. Alternatively, it would be accordingly the representation in FIG. 8 possible that it is the role of the middle roller 10 of the corresponding segment part 8, 9 immediately upstream role 10. The embodiment of the segment part 8, 9 according to FIG. 8 as such is likewise not the subject of the present invention.

Also in the in the FIG. 7 and 8th shown roles of the segment parts 8, 9 correspond to those rollers 10, which are themselves asymmetric and their immediate downstream role 10 is also asymmetric, the bale 11 of the respective roller 10 in pairs with the bale 11 of the immediately following roller 11. With respect to the two immediately successive Rollers 10, in which the gaps 12 between the bales 11 are transverse to the strand conveying direction x seen at the same locations, correspond to the bales 11 in the same order with each other. In the other non-driven rollers 10, the bales 11 correspond in inverse order with each other.

In the FIG. 6 . 7 and 8th only the rollers 10 themselves are provided with reference numerals. The division of the rollers 10 in the bale 11 and the arrangement of the gaps 12, however, results readily apparent from the representation in the FIG. 6 . 7 and 8th even.

The bales 11 of the rollers 10 have a respective bale length 11, L1, 12, L2. With 11 is here - see FIG. 9 - denotes the minimum bale length of a symmetrical roller 10, with L1 the maximum bale length of a symmetrical roller 10. In an analogous manner - see FIG. 10 - 12 denotes the minimum bale length of an asymmetrical roller 10, with L2 the maximum bale length of an asymmetric roller 10. Furthermore, the bales 11 of the rollers 10 have a respective roller diameter d1, d2. With d1 is here - see FIG. 9 - The diameter of the bale 11 of a symmetrical roller 10, with d2 - see FIG. 10 - The diameter of the bale 11 of an asymmetric roller 10. The respective roller diameter d1, d2 is uniform for the bales 11 of the respective roller 10.

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

Preferably, the maximum bale length L1, L2 is between 3 times and 4.5 times the respective roller diameter d1, d2. In particular, according to FIG. 9 for symmetrical rollers 10, the maximum bale length L1 is preferably between 3 times and 3.8 times the respective roller diameter d1. In particular, with symmetrical rollers 10, the maximum bale length L1 can be between 3.2 times and 3.6 times the respective roller diameter d1, more preferably between 3.3 times and 3.5 times. For asymmetric rollers 10, however, the ratio of maximum bale length L2 and diameter d2 may have a larger value. In particular, according to FIG. 10 for asymmetric rollers 10, the maximum bale length L2 is preferably between 3.5 times and 4.5 times the respective roller diameter d2. In particular, with asymmetrical rollers 10, the maximum bale length L2 may be between 3.7 times and 4.3 times the respective roller diameter d1, more 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, usually about 250 mm to 300 mm.

For constructional reasons is - as well as in the FIGS. 5 to 8 illustrated - that, based on the respective roller 10, either all the bales 11 of the respective roller 10 have a uniform bale length 11, L1, 12, L2 or only a single bale 11 one of the other bale 11 different bale length 11, L1, 12, L2.

In a symmetrical roller 10, for example, as shown in FIG FIG. 5 the two outer bales 11 have a uniform (large) bale length L1, wherein inner bales 11 - if they are additionally present - have either the same bale length L1 or a smaller bale length 11. In an asymmetric roller 10, for example, according to the representations in the FIGS. 5 to 8 one of the two outer bales 11 have a relatively small bale length 12, while all other bales 11 of the same roll 10 have a larger bale length L2. The reverse procedure (per roll 10 a long bale 11, otherwise short bales 11) is possible.

How out FIG. 4 it can be seen, the inner and the outer segment part 8, 9 of a respective segment 7 on 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 are opposite each other. In general, the inner segment part 8, as far as the present invention is concerned, a mirror image of the outer segment part 9. For example, as in FIG. 11 for a respective roller 10 of the inner and outer segment part 8, 9 of a segment 7 is shown, transverse to the strand conveying direction x seen the gaps 12 between the bale 11 of the rollers 10 of the inner segment part 8 at the same locations as the gaps 12 between the bale 11th the respective opposite roller 10 of the outer segment part 9 are located. Furthermore, in those rollers 10 of the inner and the outer segment part 8, 9, which are formed as symmetrical rollers 10, the opposite roller 10 of the outer or inner segment part 9, 8 also formed as a symmetrical roller 10. In the embodiment according to FIG. 11 So correspond to the bale 11 of the rollers 10 of the inner segment part 8 with the bale 11 of the respective opposite roller 10 of the outer segment part 9 in the same order. Alternatively, it is according to FIG. 12 possible that the bales 11 of the rollers 10 of the inner segment part 8 correspond to the bales 11 of the respective opposite roller 10 of the outer segment part 9 in inverse order.

The above were in connection with the FIGS. 5 to 12 Embodiments of roles of segment parts 8, 9 explained, in which the rollers 10 each have three bales 11. However, the rollers 10 could also each have two or four and in some cases even five bales 11.

In summary, the present invention thus relates to the following facts:

A segment 7 of a strand guide 2 of a continuous casting plant has an inner and an outer segment part 8, 9, between which a metal strand 4 is guided during operation. The segment parts 8, 9 each have a plurality of rollers 10, which follow one another sequentially in the strand conveying direction x, and which are supported on the respective segment part 8, 9. The rollers 10 are seen transversely to the strand conveying direction x each divided into a plurality of bales 11, between each of which there is a gap 12 having a respective gap width bL. Seen transversely to the strand conveying direction x, the gaps 12 of the rollers 10 are offset by more than the respective gap width bL per segment part 8, 9 with respect to the gaps 12 of the immediately following roller 10. In at least one of the rollers 10, the gaps 12 of the respective roller 10, viewed transversely to the strand conveying direction x, are arranged symmetrically with respect to the segment center line 14. In the other of the rollers 10, the gaps 12 of the respective roller 10, viewed transversely to the strand conveying direction x, are arranged asymmetrically with respect to the segment center line 14. In each pair of immediately adjacent rollers 10, in which the gaps 12 of both rollers 10 are arranged transversely to the strand conveying direction x asymmetric to the segment center line 14 correspond to the bale 11 of a roll 10 with the bale 11 of the other roll 10 in inverse order.

The present invention has many advantages. In particular, can be achieved in a simple and reliable way over the strand width bS almost uniform cooling. Furthermore, the cast metal strand 4 is reliably guided and encouraged. Unproven areas of the metal strand 4 are avoided as much as possible. A minimum contact surface of both the metal strand 4 and a cold strand are guaranteed. Due to the specified design and sizing an optimal number of bales 11 per roll 10 is still given. This results in advantageous effects on the surface and the microstructure of the metal strand 4. By the use of rollers 10, the bales 11 correspond in pairs with each other, and in which only one bale 11 has a different bale length than the other bale 11 of the same roll 10 results a simplified logistics.

Although the invention has been further illustrated and described in detail by the preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

mold

2

strand guide

3

liquid metal

4

metal strand

5

narrow sides

6

adjustment

7

segments

8th

inner segment part

9

outer segment part

10

roll

11

bale

12

Gaps

13

drive

13 '

clutch

14

Gießmittellinie / segment centerline

bS, bmin, bmax

lane widths

bL

gap width

d1, d2

Roll diameter

G

total extension

11, L1, 12, L2

ball lengths

V

offset

x

Strand conveying direction

Claims (16)

Segment of a strand guide (2) of a continuous casting plant, - 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) which follow each other sequentially in a strand conveying direction (x) and which are supported on the respective segment part (8, 9), - wherein the rollers (10) transverse to the strand conveying direction (x) seen in each case into a plurality of bales (11) are divided, between each of which there is a gap (12) having a respective gap width (bL) characterized, - That transversely to the strand conveying direction (x) seen per segment part (8, 9) the gaps (12) of the rollers (10) relative to the gaps (12) of the immediately following roller (10) offset by more than the respective gap width (bL) are, in that in at least one of the rollers (10) of the respective segment part (8, 9) the gaps (12) of the respective roller (10), viewed transversely to the strand conveying direction (x), are arranged symmetrically to the segment center line (14), - That in the other of the rollers (10) of the respective segment part (8, 9), the gaps (12) of the respective roller (10) are arranged transversely to the strand conveying direction (x) asymmetrically to the segment center line (14) and - That in each pair of immediately successive rollers (10) of the respective segment part (8, 9), in which the gaps (12) of both rollers (10) transversely to the strand conveying direction (x) seen asymmetric to the segment center line (14) are arranged, the bales (11) corresponding to one roll (10) with the bales (11) of the other roll (10) in inverse order. Segment according to claim 1,
characterized,
seen in the strand conveying direction (x) both at the first as well as in the last roller (10) of the respective segment part (8, 9), the gaps (12) are arranged transversely to the strand conveying direction (x) asymmetrically to the segment center line (14). Segment according to claim 1 or 2,
characterized,
that each roller (10), wherein the gaps (12) transversely to the strand conveying direction (x) seen are arranged symmetrically to the segment center line (14) with respect to both the gaps (12) of the immediately upstream and the gaps (12) of the immediately downstream Roll (10) transverse to the strand conveying direction (x) seen asymmetrically to the segment center line (14) are arranged. Segment according to claim 1, 2 or 3,
characterized,
in that the bales (11) of the first roller (10) of the respective segment part (8, 9) seen in the strand conveying direction (x) are aligned with the bales (11) of the last roller (10) of the respective segment part (8, 8) in the strand conveying direction (x). 9) correspond in inverse order. Segment according to one of the above claims,
characterized,
in that the drives (10) of the respective segment part (8, 9), in which the gaps (12) of the respective roller (10) are arranged transversely to the strand conveying direction (x) are symmetrical to the segment center line (14), in each case one drive (13) is assigned fixed or via a coupling (13 '). Segment according to one of the above claims,
characterized,
that the offset (V) of the gaps (12) opposite the gaps (12) of the respective immediately succeeding roller (10) at least 10 mm larger than the gap width (BL). Segment according to one of the above claims,
characterized,
in that the bales (11) of the rollers (10) have a respective maximum bale length (L1, L2) and a roller diameter (d1, d2) which is uniform for the bales (11) of the respective roller (10) and in that the respective maximum bale length (L1 , L2) is between 3 times and 4.5 times the respective roller diameter (d1, d2). Segment according to claim 7,
characterized,
that the respective maximum barrel length (L1, L2) symmetrically relative to the segment center line are arranged seen in rollers (10) in which the gaps (12) transversely to the strand conveying direction (x) (14), between the 3-fold and 3,8- times of the respective roll diameter (d1) and in rolls (10), in which the gaps (12) are arranged transversely to the strand conveying direction (x) asymmetrically to the segment center line (14), between 3.5 times and 4.5 times the respective roll diameter (d2). Segment according to one of the above claims,
characterized,
in that the bales (11) have a respective bale length (11, L1, 12, L2), that in the case of the rollers (10), in which the gaps (12) are arranged transversely to the strand conveying direction (x) symmetrical to the segment center line (14) , either all bales (11) have a uniform bale length (L1) or only a single bale (11) has a bale length (11, 12, L2) different from the other bales (11) and that in the case of the rollers (10) where the gaps (12), viewed transversely to the strand conveying direction (x), are arranged asymmetrically with respect to the segment center line (14), only a single bale (11) has a bale length (11, 12, L2) different from the other bales (11). Segment according to one of the above claims,
characterized,
in that the bales (11) have a respective bale length (11, L1, 12, L2) and that the bale length (11, L1, 12, L2) is at least 250 mm and at most 900 mm. Segment according to one of the above claims,
characterized,
that the rollers (10) in which the gaps (12) transversely to the strand conveying direction (x) seen are arranged asymmetrically to the segment center line (14), a unitary roller diameter (d2) have. Segment according to claim 11,
characterized,
in that the rollers (10) of the respective segment part (8, 9), in which the gaps (12) are arranged transversely to the strand conveying direction (x), are symmetrical to the segment center line (14), have a uniform roll diameter (d1) and that roll diameter (d1) d1) is greater than the roll diameter (d2) of the rolls (10), in which the gaps (12), viewed transversely to the strand conveying direction (x), are arranged asymmetrically with respect to the segment center line (14). Segment according to one of the above claims,
characterized,
in that the inner and outer segment parts (8, 9) have an equal number of rollers (10) such that, relative to the metal strand (4), the rollers (10) of the inner and outer segment parts (8, 9) face each other and that seen transversely to the strand conveying direction (x), the bales (11) of the rollers (10) of the inner segment part (8) with the bales (11) of the respective opposite roller (10) of the outer segment part (9) in the same order or in inverse Sequence correspond. continuous casting, - wherein the continuous casting a mold (1) and a mold (1) downstream strand guide (2), - wherein by means of the mold (1) a slab-shaped metal strand (4) is poured, which is withdrawn by means of the strand guide (2) in a strand conveying direction (x) from the mold (1), - Wherein the metal strand (4) seen transversely to the strand conveying direction (x) has a strand width (bS) which 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 mold (1), - Wherein the strand guide (2) has a plurality in the strand conveying direction (x) sequentially successive segments (7) according to one of the above claims. Continuous casting plant according to claim 14,
characterized,
that symmetrically relative to the segment center line are seen in rollers (10) in which the gaps (12) transversely to the strand conveying direction (x) (14) arranged to the outer bale (11) by at least 30 mm above the minimum width (bmin) inwardly to extending the segment centerline (14). Continuous casting plant according to claim 14 or 15,
characterized,
that even with rollers (10), in which the gaps (12) are arranged transversely to the strand conveying direction (x) asymmetric to the segment center line (14), the outer bale (11) by at least 30 mm over the minimum width (bmin) to the inside extend to the segment centreline (14).

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