DE102007006458A1 - Continuous casting device for producing steel slabs - Google Patents

Abstract

The invention relates to a continuous casting for producing slabs of steel, with a mold and downstream strand guide, which has scaffolding with lower and upper frames, where guide rollers are provided, the mouth width of the frame connecting adjusting elements is infinitely adjustable, being provided as adjusting cylinder are, which are controlled by switching valves. The benefits of position-controlled cylinder as adjusting elements exploitable, but on the other hand, the cost should be less. For this purpose, it is proposed that the valves are designed as quick-acting valves or that the valves are provided with a controller which allows a fast Umschaltvorgag.

Description

The The invention relates to a continuous casting device for producing steel slabs, with a mold and downstream strand guide, the scaffolding with lower and upper frame has, where Guide rollers are provided whose jaw width through the Frame connecting adjusting elements is infinitely adjustable, wherein As adjustment hydraulic cylinders are provided by switching valves to be controlled.

Furthermore The invention relates to a method for operating the continuous casting device.

From the EP 980 295 B1 is a continuous casting for producing slabs of steel known with a mold and downstream strand guide, the scaffolding with lower and upper frame has, where guide rollers are provided, the mouth width of the frame connecting adjusting elements is infinitely adjustable. In this case, odometer and pressure sensor are provided, which detect the force of the adjusting elements and with which the jaw width of the guide rollers can be detected. In addition, an oscillator is provided, with which the adjusting elements can be excited to a vibration.

In In practice, the segments used here are called CyberLink segments designated. In general, the oscillation is by specifying many discrete interpolation points per oscillation period, the vertices have sinusoidal distribution and the movement is forced position-controlled.

With this facility may rely on certain process-relevant information, such as the position of the swamp tip, closed back become.

The hereby used position-controlled adjusting units are relatively expensive, so that one has already suggested to their Place cylinder through switching valves

These Solution is cheaper, but has the disadvantage that the advantageous oscillation no longer in the known manner could be done.

Of the Invention is based on the object, the continuous casting of the type mentioned above in such a way that therewith the advantages position-controlled cylinders can be used as adjusting elements, On the other hand, the costs are lower.

This object is achieved according to the invention in that
either the valves are designed as quick-acting valves or that the valves are provided with a controller which allows a fast switching operation.

To In another embodiment, the valves should connections for the optional attachment of pressure cells.

• 1. die Oberrahmen durch schnelles Hin- und Herschalten der Schaltventile über einen relativ kurzen Messzeitraum – von wenigen Sekunden – in eine-oszillierende-Bewegung zu versetzen, so dass dann anschließend die Weg- und Kraftsignale in bekannter Weise auswertbar sind. Dass dabei nicht mehr, wie bisher bekannt, eine Sinusbewegung sondern eine durch die Trägheit des Systems verschliffene Dreiecksbewegung entsteht, wird bewusst in Kauf genommen. Auf die Präzision und Zuverlässigkeit der Auswertung hat das keinen Einfluss.
• 2. die Ventile mit Anschlüssen zur Anbringung von Druckmesseinrichtungen zu versehen, damit Letztere entweder von vorneherein mit ausgeliefert werden oder die Ventile im Falle eines "Upgrades" leicht nachgerüstet werden können.

It is also suggested

• 1. To shift the upper frame into an oscillating motion by rapidly switching the switching valves over a relatively short measuring period - from a few seconds, so that the displacement and force signals can subsequently be evaluated in a known manner. It is deliberately accepted that it is no longer a sinusoidal movement, as is known so far, but a triangular motion that is ground by the inertia of the system. This has no influence on the precision and reliability of the evaluation.
• 2. To provide the valves with connections for the installation of pressure gauges, so that the latter can either be delivered from the outset or the valves can easily be retrofitted in the event of an "upgrade".

investigations from measurement recordings on existing Cyberlink segments with switching valve technology have shown that the achievable deformation rates when using slightly larger nozzles than common practice (1.8-2.0 mm instead of 1.3-1.5 mm) as far as above the natural strand shell deformation rates the creep behavior of the potted materials and in the same Magnitude as in the original CyberLink segments lie that evaluation possible is.

Of the The fact that the movement resulting from this control is not is forcibly sinusoidal, is to be considered in the pulling evaluation methods (hysteresis, phase response, bath mirror movement) not decisive.

the Circumstance that during the measurement the mean cylinder position if necessary, is not kept constant, by a possible short measurement period.

By The optional use of pressure cells becomes overload monitoring made possible.

Also without the use of pressure cells shows the proposed procedure a way to implement the "CyberLink additional features" on, if instead of the hysteresis or phase shift evaluation the Gießspiegelsignal is correlated with the upper frame oscillation.

additional may be the use of (electronic) facilities for speeding up the switching operations be advantageous.

Furthermore can also be the installation of fans to improve the convective Heat dissipation in the valves be advantageous.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - EP 980295 B1 [0003]

Claims (6)

Continuous casting for producing slabs of steel, with a mold and downstream strand guide, which has scaffolding with lower and upper frame, where guide rollers are provided, the mouth width of the frame connecting adjusting elements is infinitely adjustable, being provided as adjusting cylinders, through Control valves are controlled. characterized in that the valves are designed as quick-acting valves. Continuous casting device for producing slabs made of steel, with a mold and downstream strand guide, the scaffolding with lower and upper frame has, where Guide rollers are provided whose jaw width through the Frame connecting adjusting elements is infinitely adjustable, wherein As adjustment cylinders are provided by the switching valves to be controlled. characterized in that the valves with a Control are provided, which allows a fast switching operation. Continuous casting device according to one of the preceding Claims, characterized in that the valves connections for the optional attachment of pressure cells. Continuous casting device according to one of the preceding Claims, characterized in that the valves means assigned to improve the convective heat dissipation are. Method for operating a continuous casting device according to one of the preceding claims, characterized that the Oberrahmenoszillation one, possibly ground, Triangle signal follows. Method for operating a continuous casting device according to one of the preceding claims, characterized that you work with the shortest possible measuring duration.