EP0960671B1 - Strand guide segment for slab casters - Google Patents

Description

The invention relates to a strand guide segment for Slab caster with one between guide rollers fixed-sided and a loose-sided frame distance-adjustable guide width for the casting strand, where the frames to overcome the ferrostatic pressure and to Setting the desired format width of the strand with Interacting means interact.

An essential factor for competitiveness on the Continuous caster is the training of the Strand guide segments and the base frame. These are supposed to on the one hand, optimally meet the operational requirements, on the other hand, they have to be competitively priced, especially because the cost share of the strand guide Depending on requirements, approx. 30 to 70% of the total system costs accounts.

Continuous casting plants, in particular for casting steel slabs, use rollers to guide the strand, one more not limit solidified strand in its thickness and one Bulging of the strand shell due to the ferrostatic Prevent internal pressure.

Usually groups of at least four are used Role pairs combined into segments. The above the Strands arranged strand guide rollers are on Top segment or attached to the loose frame part, while the strand guide rollers below the strand on Lower segment or arranged on the fixed part of the segment are. Fixed part and loose part of the individual segment are usually connected to each other via four pull cylinders. These so-called clamping cylinders pull up the upper part of the segment Spacers, so that between the opposite Rolls the desired mouth width results. This corresponds to the Strand thickness.

Modern process technologies to improve the Product quality requires a change in the mouth width during the casting process. In particular, the so-called "Soft reduction" in the area of the bottom of the strand requires a wedge-shaped setting and a variable one Changing the mouth width of the corresponding segment. A Known possibility of changing the mouth width for segments with four clamping cylinders is that the cylinders with servohydraulic position control are formed.

DE 196 27 336 C1 describes one method and one Device for guiding a strand in a Continuous caster with a "soft reduction line" known in the case of the hydraulic servo units, the mouth width of the continuously adjust opposite strand guide rollers. The well-known strand guide, which four per segment Servo piston cylinder units for stepless adjustment of the Mouth width of the opposite strand guide rollers has, is characterized in that hydraulic lines Ring surfaces and piston surfaces of two neighboring ones Servo piston cylinder units with a common servo valve connect, and that position transmitter's with a common Servo valve controlled servo piston cylinder units are technically interlinkable.

The clamping cylinders are usually next to the segment arranged the roles and are therefore inclusive of hydraulic lines and servo valves Servo piston cylinder units in the area of Radiation exposure of the casting strand. You need to consequently at such a distance - middle segment - Hydraulic cylinder - be arranged that the Radiation exposure remains limited. The one for this required frame width of the segment leads because of The load on the frame is comparatively heavy construction, which the cost of manufacturing and Assembly and the scaffolding costs significantly burdened.

Based on this prior art, the invention lies Task, a strand guide for Slab casting plants mentioned in the preamble of claim 1 Art significantly compared to conventional designs Simplify to do this with pressure cylinders through their Storage in the area of the upper frame outside the cooling chamber are and with a lighter frame construction and simplified water cooling system and piping for the roller cooling contributes a substantial saving in costs Manufacture and assembly of the strand guide elements achieve.

To make matters worse, the scope for constructive improvements to one for decades technically developed component in constant progress is comparatively small, so that significant improvements and initially cost savings hardly promise seem to be.

• der Oberrahmen bei biegungs- und verwindungssteifer Ausführung in allen Achsen schwenkbar ist, wobei
• eine Anstellung des Oberrahmens mit exakter Maßhaltigkeit der gewünschten Maulweitengeometrie von Dicke und Neigung in Längs- und Breitachse möglich ist,
• die Hydraulikzylinder als Druckzylinder mit vergleichsweise kleinem Durchmesser ausbildbar sind, um bei dadurch verkürztem Hebelarm das Lastmoment zu reduzieren, wobei
• die Zylinder einschließlich ihrer Mess- und Regelorgane außerhalb der Kühlkammer liegen, und wobei
• die äußeren Segmentrollen infolge der geänderten Bauweise antreibbar sind,
• wodurch zugleich mit optimaler Funktionserfüllung ein kostengünstiger Segmenttyp entsteht, der dem konventionellen Typ mit Zugzylindern überlegen ist und ihn ersetzt.

The present invention, based on an innovative segment adjustment with top-mounted pressure cylinders, is based on the further idea of finding solutions for dynamically adjustable, regulated upper segment frames, so that

• the upper frame can be pivoted in all axes in the case of a rigid and torsionally rigid design, whereby
• the upper frame can be adjusted with exact dimensional accuracy of the desired jaw width geometry of the thickness and inclination in the longitudinal and wide axes,
• the hydraulic cylinders can be designed as pressure cylinders with a comparatively small diameter, in order to reduce the load torque while the lever arm is shortened, whereby
• the cylinders including their measuring and control elements are outside the cooling chamber, and where
• the outer segment rollers can be driven due to the changed design,
• which at the same time creates an inexpensive segment type with optimal function fulfillment, which is superior to the conventional type with pull cylinders and replaces it.

• dass als Stellmittel vier unabhängig einstellbare Druckzylinder vorgesehen und außerhalb des Strahlungsbereiches an der Oberseite des Segmentes angeordnet sind, wobei der die Segmentbreite bestimmende Abstand Segmentmitte-Zylinder um das Maß des an die Oberseite des Segmentes verlagerten Zylinders beidseitig verschmälert ist, und
• dass die Segmenttraversen anstelle von Wasserkühlung mit Strahlenschutzblechen versehen sind, sowie
• dass seitlich an den Unterrahmen gekühlte Seitenrahmen angeflanscht sind.

The invention surprisingly achieves the object by

• that four independently adjustable pressure cylinders are provided as adjusting means and are arranged outside the radiation area on the top of the segment, the segment-cylinder distance determining the segment width being narrowed on both sides by the dimension of the cylinder shifted to the top of the segment, and
• that the segment traverses are provided with radiation shields instead of water cooling, and
• that cooled side frames are flanged to the side of the subframe.

Due to the new connection of the cylinders, these are located outside the radiation range of the strand on the Top of the segment and are therefore including theirs Pipe connections and valve arrangements thermally less endangered. It can also result from less The frame construction with the same rigidity be made much lighter because the lever arm between Printing cylinder and ferrostatic force is reduced. Furthermore, studies have shown that a usual, complex truss and frame cooling by means of Cooling water with the formation of the segment cross members Radiation shields are no longer required to be a to prevent inadmissible heating of the trusses, what for contributes that cooled laterally to the subframe Side frames are flanged.

• dass ein kastenförmiges Rahmen-Seitenteil als wasserführender Kanal ausgebildet ist, und
• dass Wasseranschlüsse für die Rollenkühlung an einer Seite des Strangführungselementes angeordnet sind. Hiermit werden signifikante Vereinfachungen der Leitungsführung und ihrer Anschlüsse für die Rollenkühlung erzielt. Weitere Vorteile ergeben sich dadurch,
• dass der Oberrahmen biegungs- und verwindungssteif ausgebildet und durch seine kardanische Anlenkung an die Hydraulikzylinder in allen drei Achsen schwenkbar ist,
• dass die Hydraulikzylinder als Druckzylinder im Durchmesser vergleichsweise klein sind, wodurch das Lastmoment infolge Verkürzung des Hebelarms reduziert wird,
• dass mit Ausbildung und starrer Anordnung des Seitenrahmens die Möglichkeit gegeben ist, die Rahmen auf Distanzstücke zu fahren und somit die Rollendistanz beispielsweise entsprechend der Segmentdicke einzustellen,
• dass die Hydraulikzylinder sich außerhalb der Kühlkammer befinden, so dass für diese einschließlich der Mess- und Regelorgane zulässige Temperaturen gegeben sind,
• dass dies auch für die komplett außerhalb der Kühlkammer liegenden Hydraulikverrohrungen und deren Kupplungselemente gilt,
• dass bei Lagerung der Zylinder in den Seitenrahmen bei dynamischer Anstellung des Oberrahmens gegen den Warmstrangdruck (p_ferro) der Oberrahmen in seinen drei Achsen frei verstellbar und neigbar ist, und zwar mit exakt maßgerechter Positionierung durch dessen kardanische Lagerung, ohne dass hierbei horizontale Zwangskräfte in den Lagerungen bei Anstellvorgängen entstehen.

Further advantageous effects due to the configurations of the strand guide segment essential to the invention for the optimal solution of the task are

• that a box-shaped frame side part is designed as a water-carrying channel, and
• that water connections for the roller cooling are arranged on one side of the strand guide element. This leads to significant simplifications of the cable routing and its connections for the roller cooling. Further advantages result from
• that the upper frame is designed to be resistant to bending and torsion and can be pivoted in all three axes thanks to its cardanic linkage to the hydraulic cylinders,
• that the hydraulic cylinders as pressure cylinders are comparatively small in diameter, which reduces the load torque due to the shortening of the lever arm,
• that with the formation and rigid arrangement of the side frame, there is the possibility of driving the frames on spacers and thus adjusting the roller distance, for example, according to the segment thickness,
• that the hydraulic cylinders are located outside the cooling chamber, so that permissible temperatures are given for them, including the measuring and control elements,
• that this also applies to the hydraulic piping and its coupling elements that are completely outside the cooling chamber,
• that when the cylinders are mounted in the side frame when the upper frame is dynamically adjusted against the hot extrusion pressure (p _ferro ), the upper frame can be freely adjusted and tilted in its three axes, with precise dimensional positioning thanks to its cardanic mounting, without any horizontal constraining forces in the Bearings arise during employment.

And finally there are advantageous cylinder connections the loose frame in that either the impression cylinder with their flanges in a spherical cap Storage arranged, or then rigid with the side frame connected and with the loose frame by a Cardan double joint are articulated with all-round clearance.

The aforementioned constructive according to the invention Simplifications and improvements to the strand guide segment can, in the alternative, increase their effectiveness that with the new segment type due to its uncomplicated construction a standardization of Segment components is easier to implement. cost statements have shown that with the invention, the manufacturing costs of Strand guide segments can be significantly reduced. Add to that continue using that using the new cylinder of pressure cylinders instead of clamping cylinders for the installation of standard cylinder types, which are available at comparatively low prices. Furthermore, by standardizing the roles, e.g. B. means Reduction of the different roll diameters and Storage types, further cost savings can be achieved.

• Verwendung von vier Druckzylindern oberhalb des Segmentes, d. h. außerhalb des Strahlungsbereiches,
• geringere Segmentbreite durch Verringerung des Abstandes Segmentmitte-Zylinder,
• Verwendung von Strahlenschutzblechen für die Traversen,
• gekühlte Seitenrahmen, seitlich an den Unterrahmen angeflanscht,
• Minimierung der Rohrleitungen durch Nutzung des kastenförmigen Seitenteils zur Wasserführung, Wasseranschlüsse nur auf einer Seite des Segmentes sowie Ersatz der Traversenkühlung durch Strahlenschutzbleche.

In particular, the features according to the invention result in the following advantages:

• Use of four pressure cylinders above the segment, ie outside of the radiation area,
• narrower segment width by reducing the segment center-cylinder distance,
• Use of radiation protection plates for the cross beams,
• cooled side frames, flanged to the side of the subframe,
• Minimization of the pipelines by using the box-shaped side part for water supply, water connections only on one side of the segment and replacement of the cross-beam cooling with radiation protection plates.

Further details, features and advantages of the invention result from the explanation below one in the Drawings schematically illustrated embodiment.

Fig. 1

in Frontansicht ein Strangführungssegment, teilweise im Schnitt,

Fig. 2

das Strangführungssegment gemäß Fig. 1 in Seitenansicht, ebenfalls teilweise im Schnitt,

Fig. 3

in Seitenansicht und teilweise im Schnitt einen hydraulischen Druckzylinder mit Lagerung seines Flansches nach Art einer Kugelkalotte,

Fig. 3a

in Seitenansicht und teilweise im Schnitt einen hydraulischen Druckzylinder mit unbeweglicher Lagerung und Anbindung an den losseitigen Rahmen über eine Kardan-Doppelgelenkanordnung mit allseitig schwenkbarem Freigang,

Fig. 4

in Seitenansicht einen Teil des Strangführungssegmentes mit Segmenttraversen und an diesen angeordneten Strahlenschutzblechen.

Show it:

Fig. 1

in front view a strand guide segment, partly in section,

Fig. 2

1 in side view, also partially in section,

Fig. 3

in side view and partially in section a hydraulic pressure cylinder with its flange mounted in the manner of a spherical cap,

Fig. 3a

in side view and partially in section, a hydraulic pressure cylinder with immovable mounting and connection to the frame on the loose side via a cardan double-joint arrangement with swiveling clearance on all sides,

Fig. 4

a side view of part of the strand guide segment with segment cross members and radiation protection plates arranged on them.

The strand guide segment shown in Figure 1 for Slab caster has one between guide rollers (1) loose side frame (3) and guide rollers (1 ') one fixed frame (2) an adjustable distance Guide width (F) for the casting strand (10), the Frame (2, 3) to overcome the ferrostatic pressure and for setting the desired format width of the strand (10) interact with actuators.

According to the invention, four are independent as adjusting means adjustable pressure cylinders (4, 4 '; 5, 5') are provided and outside the radiation range at the top of the Segment arranged, the one determining the segment width Distance (A) segment center cylinder by the amount of the to the Top of the segment shifted cylinder (4, 5) on both sides is narrowed.

As can be seen from FIG. 2, this results from Relocation of the pressure cylinders (4, 4 '; 5, 5') on the top of the segment outside the radiation range Possibility of the lateral distance (B) of one each Cylinder pair (4, 5) much narrower than conventional ones To design and thus a lighter design of the segment due to reduced bending moment of the frame contribute. In addition, the synopsis of FIG. 1 shows and 2 the connection of one printing cylinder (4) or (5) on the side frame (11) with the help of a universal joint (15). To 1 shows the connection of the guide frame (2) over the subframe (8) with the Side frame (11) into a compact structural unit. Further the section shown there shows the water connection (12) on the water-carrying side frame (11). With that the Pipe guide for cooling the rollers (1, 1 ') essential simplified. Between the guide rollers (1) in Fig. 2 is the of this led casting strand (10) with dash-dotted Lines indicated.

Figure 3 shows a standard printing cylinder (4, 5), the Flange (14) in a spherical cap Guide (13) is added. But also a rigid one Attachment according to Figure 3a is when articulated Cardan double joint on the loose frame (3) appropriate. With it and with the gimbal connection of the Cardan joint (15) according to FIGS. 1 and 2 and in particular Fig. 3a results in an optimal adhesion between one Cylinder (4, 4 '; 5, 5') and one of the side frames (11) without lateral constraint.

Figure 4 shows the advantageous use of Radiation protection plates (7) on trusses (6) of the Strand guide segment. The illustration demonstrates in convincingly after that with the radiation protection plates (7) simplification achievable compared to the invention water-cooled segment cross members.

As a result, the invention is comparatively uncomplicated Construction very well suited to the task at the beginning realize and solve them in an optimal way.

Claims (4)

1. A billet guide segment for slab casters, wherein a guide width (F) for the billet (10) being cast can be adjusted between guide rolls (1) of a frame on the stationary side and a frame on the movable side (2, 3), and wherein the frames (2, 3) cooperate with adjusting elements in order to overcome the ferrostatic pressure and to adjust the desired format width of the billet (10), characterized by the fact

   that four independently adjustable pressure cylinders (4, 4'; 5, 5') are provided as the adjusting elements and arranged outside the radiation zone on the upper side of the segment, wherein the distance (A) between the segment center and the cylinder which defines the segment width is realized narrower on both sides by the dimension of the cylinder (4, 5) that is displaced to the upper side of the segment, by the fact

   that the segment crossheads (6) are provided with radiation protection plates (7), and by the fact

   that water-cooled lateral frames (11) are laterally flanged onto the subframe (8).
2. The billet guide segment according to Claim 1, characterized by the fact

   that a box-shaped lateral frame part (11) is realized in the form of a channel that conveys water, and by the fact

   that water connections (12) for cooling the rolls are arranged on one side of the billet guide element.
3. The billet guide element according to Claim 1 or 2, characterized by the fact that pressure cylinders (4, 5) are arranged in a calotte-shaped bearing (13) with their flanges (14) and coupled to lateral frame elements (11) of the segment by means of universal joints (15).
4. The billet guide element according to Claim 1 or 2, characterized by the fact that pressure cylinders (4, 5) are immovably supported on this billet guide element and coupled with lateral play to the frame (11) on the movable side by means of a double universal joint arrangement (15).

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