EP0023897B1 - Installation in a continuous casting plant - Google Patents

Description

The invention relates to a device on a continuous casting plant for steel, with a mold and a subsequent strand guide, wherein a stirring coil is provided for generating an electromagnetic traveling field in the molten steel.

A continuous casting installation, as described in the introduction, is known, for example, from DE-AS 1 962 341. In this device for generating an electromagnetic traveling field are arranged in the region of the casting curve and are firmly connected to the casting curve. This embodiment has the disadvantage that the facilities for producing traveling fields are unprotected and can be damaged in the event of strand breaks. In addition, the removal and installation of the electrical devices after damage is difficult and time-consuming, which results in considerable downtimes and high costs.

The invention aims to avoid these disadvantages and difficulties and has as its object to provide a continuous casting installation of the type described above, in which damage to the devices for generating the electromagnetic traveling field can be avoided in the event of a strand breakdown or other operational disruptions, and a quicker in the event of a fault Expansion of these facilities is possible regardless of further assembly work on the strand guide itself.

This object is achieved in that the stirring coil between the operating position on the strand guide and an outside of the strand guide below a strand support supporting the strand guide is in a retracted position either by means of a sliding carriage guided on rails by means of a steep drive or pivotable about a pivot axis.

Practice in the foundry has shown that strand breaks occur in most cases during start-up. The construction according to the invention thus offers the advantage of eliminating the risk of damage when starting the train by virtue of the fact that the stirring coil is in the retracted position during startup. Only when the warm strand has passed the lower end of the stirring coil is the stirring coil moved up to the strand guide and switched on.

In addition, however, the stirring coil can also be quickly withdrawn from the endangered position if a strand break occurs during the casting operation. Furthermore, it is also possible to pull the stirring coil back when removing the strand guide so that removal can take place without hindrance.

From DE-B-1 920 757 it is known, for the purpose of installing and removing parts of the strand guide, to move these parts out of the installed position into a position outside the strand guide frame. In this position outside the strand guide frame, the part to be removed or installed can be manipulated by means of a crane. DE-B-1 920 757 does not show how to proceed in the event of operational disruptions, particularly in the event of a strand breakdown; In particular, damage to the parts of the strand guide that are to be installed and removed cannot be prevented in a system according to DE-B-1 920 757.

An advantageous embodiment is characterized in that the pivot axis is attached to the strand guide frame in a horizontal arrangement.

The swivel range is expediently limited by stops of the stirring coil in the operating position.

A cable drum, which is fastened to the stirring coil and is connected to a suspension device on the stirring coil itself via a cable and a deflection roller attached to the strand guide frame, advantageously serves for pivoting the stirring coil.

• Fig. 1 eine Seitenansicht der erfindungsgemäßen Stranggießanlage,
• Fig. 2 eine Ansicht gemäß Pfeil 11 in Fig. 1 und
• Fig.3 einen Schnitt nach der Linie 111-111 der Fig. 2 in vergrößerter Darstellung; in
• Fig. 4 ist eine weitere Ausführungsform der Erfindung in Seitenansicht dargestellt.

Further details of the invention are explained in more detail with reference to two preferred embodiments in the drawings. Here shows

• 1 is a side view of the continuous caster according to the invention,
• Fig. 2 is a view according to arrow 11 in Fig. 1 and
• 3 shows a section along the line 111-111 of Figure 2 in an enlarged view. in
• 4 shows a further embodiment of the invention in side view.

1 bezeichnete Kokille eine den Strang an

Breitseiten mittels Rollen 2 stützende Strangführung 3 angeordnet, welche d" ch einen Schnellverschluß 4 an einem semich der Stranggießanlage befindlichen Träger 5 befestigt ist. Unterhalb dieser Befestigungsvorrichtung befindet sich im Bereich einer Strangführungszone, vorzugsweise der Biegezone 6, eine lösbar an einem Verschiebewagen 7 montierte Einrichtung zur Erzeugung eines elektromagnetischen Wanderfeldes, eine sogenannte »Rührspule« 8. Mit Hilfe des Verschiebewagens 7 ist die Rührspule 8 aus der in Fig. 1 voll ausgezogenen Betriebsstellung, welche sich in unmittelbarer Nähe der Strangführungsrollen 2 befindet, in eine durch die strichpunktierte Linie 9 in Fig. 1 angedeutete, durch den Träger 5 geschützte Rückzugsstellung verfahrbar. Dazu wird der Verschiebewagen auf Rädern 10 entlang der Führungsschienen 11, welche durch Stützen 12 vom Träger 5 und durch weitere Stützen 13 vom Gerüst 14 getragen werden, mittels eines Stelltriebes 15 wie eines Druckmittelzylinders bewegt. Dieser Stelltrieb 15 ist, wie aus Fig. ersichtlich, zwischen den Schienen 11 angeordnet und sowohl am quer zur Schienenrichtung montierten Träger 16 als auch am Verschiebewagen 7 schwenkbar gelagert.1 is subsequent to the

1 designated a mold on the strand

The broadside is arranged by means of rollers 2 supporting strand guide 3, which is fastened by a quick-release fastener 4 to a support 5 located in the continuous caster. Below this fastening device is located in the area of a strand guiding zone, preferably the bending zone 6, a device which is detachably mounted on a transfer carriage 7 to generate an electromagnetic traveling field, a so-called "stirring coil" 8. With the help of the sliding carriage 7, the stirring coil 8 is in the fully extended operating position in FIG. 1, which is located in the immediate vicinity of the strand guide rollers 2, into a line 9 in dash-dotted lines in 1, retracted position protected by the carrier 5. For this purpose, the sliding carriage on wheels 10 along the guide rails 11, which are supported by supports 12 from the carrier 5 and by further supports 13 from the frame 14, by means of an actuator 15 such as a pressure medium cylinder moved this Actuator 15 is, as can be seen from Fig., Between the Arranged rails 11 and pivotally mounted both on the carrier 16 mounted transversely to the rail direction and on the transfer carriage 7.

In Fig. 1, the feed position 17 of the stirring coil 8 is further shown in dash-dotted lines. For this purpose, both the carrier 16 and the actuator 15 are removed and the sliding carriage 7 is moved on the rail 11 up to the rear stop 18. The stirring coil is lowered into a position between the rails by a crane (not shown) and fastened to the transfer carriage by means of screws. With a pulling device inserted from the strand guide side, the stirring coil in connection with the sliding carriage 7 is pulled into the operating position and the actuator 15 with the carrier 16 is mounted on the rail 11.

The section shown in FIG. 3 shows an enlarged representation of a guide rail 11 which is advantageously designed as a hollow box profile and on which a wear strip 19 is screwed, whereupon the wheels 10 of the transfer carriage 7 roll.

A further preferred embodiment of the invention is shown in FIG. 4, the same parts being provided with the same reference numbers. In this construction, the stirring coil 8 can be pivoted from a fully excellent operating position set on the strand guide 3 into a retracted position shown in dash-dot lines around a horizontal axis 20 fastened to the frame. The stirring coil 8 is detachably attached to a crossbar 21. A cable drum 22 is arranged on the side of the stirring coil and is connected to a suspension device 26 on the stirring coil 8 via a cable 23 and a deflection roller 25 fastened to a lateral support 24 of the strand guide frame. By turning the cable drum 22, whereby the cable length is changed, the stirring coil 8 can now be lowered from the operating position by its own weight into the retracted position.

The pivoting range is advantageously limited by stops, the stop 27 of the stirring coil 8 interacting with the stop 28 of the casting bow in the operating position and the entire cross member 21 resting on the supports 29 of the casting frame in the retracted position.

Claims (4)

1. Arrangement at a continuous casting plant for steel comprising a mould (1) and a strand guide (3) following thereupon, an agitator coil (8) being provided to produce an electromagnetic travelling field in the molten steel, characterised in that the agitator coil (8) either is displaceable by an adjustment drive (15) by means of a displacement car (7) guided on rails (11) or is pivotable about a pivot axle (20), between the operating position adjusted to the strand guide (3) and a retracted position outside of the strand guide (3) being below a lateral carrier (5) supporting the strand guide (3).

2. Arrangement according to claim 1, characterised in that the pivot axle (20) is fastened in a horizontal disposition on the strand guiding stand (Fig. 4).

3. Arrangement according to claim 2, characterised in that the pivot region is delimited by stops (27, 28) of the agitator coil (8) in the operating position (Fig. 4).

4. Arrangement according to claim 3, characterised in that a rope drum (22) is fastened to the agitator coil (8), which rope drum, for pivoting the agitator coil (8), is connected with a suspension means (26) on the agitator coil (8) itself via a rope (23) and a deflection pulley (25) fastened to the strand guiding stand (Fig. 4). -

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