Note: Descriptions are shown in the official language in which they were submitted.
336
This invention relates to an arrangement at a continu-
ous casting plant for steel comprising a mould and a strand
guide following thereupon, wherein an agitator coil for pro-
ducing an electromagnetic travelling wave is provided in the
molten steel.
A continuous casting plant of this type is known for
instance from German Auslegeschrift No. 1,362,341. There,
arrangements for producing an electromagnetic travelling wave
are arranged in the region of the casting arc and rigidly
connected with the casting arc. This mode of realization has
the disadvantage that the arrangements for producing the
travelling wave are unprotected and may be damaged in case
of a strand breakthrough. In addition, the removal and in-
stallation of the electric arrangements, after a damage has
occurred, are difficult and time-consuming, which results
~in considerable downtimes and high costs.
The invention aims at avoidinq these disadvantages and
difficulties and has as its object to provide a continuous
casting plant of the initially described kind, in which, in
case of a strand breakthrough or any other operational dis-
turbance, damage to the arrangements for producing the elec-
tromagnetic travelling wave can be avoided, and in which, in
case of a failure, a rapid removal of these arrangements,
independently of further assembly operations on the strand
guide itself, is possible.
This object is achieved according to the invention in
that the agitator coil is mounted so as to be movable be
tween an operation position adjusted to the strand guide and
a retracted position located outside of the strand guide.
Advantageously, the retracted position is below a la-
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36
teral support supporting the strand guide.
Experience in the casting operation has shown that a
strand breakthrough, in by far the most cases, occurs during
starting. The construction according to the inven-tion, thus,
has the advantage that the risk of a damage during starting
of the strand is eliminated in that the agitator coil is in
the retracted position during starting. It is only when the
hot strand has passed the lower end of the agitator coil that
the latter is moved towards the strand guide and switched on.
Moreover, the agitator coil can also be ~uickly retract-
ed from its endangered position, if a strand breakthrough
occurs during the casting operation. Furthermore, it is also
possible to retract the agitator coil during the removal of
the strand guiding arc, so that the removal may take place
without hindrance.
According to an advantageous conEiguration of the in-
vention, the agitator coil is mounted on a displacement car
guided on rails, the rails advantageously being provided
with wear ledges. Preferably, the displacement car is
actuatable by an adjustment drive.
A further embodiment is characteriæed in that the agi-
tator coil is pivotable between the operation position and
the retracted position, the pivot axis preferably being
fastened to the strand guiding stand in a horizontal arrange-
ment.
Suitably, the pivot range is delimited by stops of the
agitator coil in the operation position.
Advantageously, a rope drum serves for pivoting the
agitator coil, which rope drum is fastened to the agitator
coil and connected with a suspension means at the agitator
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136
coil itself via a rope and a pulley fastened to the strand
guiding stand.
Further features of the invention will be explained in
more detail by way of two preferred embodiments with re-
ference to the accompanying drawings, wherein:
Fig. 1 is a side view of the continuous casting plant
according to the invention;
Fig. 2 is a view according to the arrow II in Fig. l;
Fig. 3 is a section along line III-III of Fig. 2 in an
enlarged illustration; and
Fig. 4 is a further embodiment of the invention in side
view.
According to Fig. 1, a strand c~uide 3 is arranged to
follow a mould 1, which strand guide supports the strand on
its broad sides by means of rollers 2 and is fastened to a
carrier 5 located lateral of the continuous casting plant by
means of a quickloclc 4. Below this iastening means, in the
region of a strand guiding zone, preferably bending zone 6,
an arrangement for producing an electromagnetic travelling
wave, a socalled "agitator coil" 8, is detachably mounted on
a displacement car 7. With the help of the displacement car
7 the agitator coil is displaceable from an operation posi-
tion shown in full lines in Fig. 1, which is in the immediate
vicinity of the strand guiding rollers 2, into a retracted
position protected by the carrier 5, which position is indi-
cated by a dot-and-dash line 9 in Fig. 1. To this end, the
displacement car is moved by means of an adjustment drive 15,
such as a pressure medium cylinder, on wheels 10 along guide
rails 11 which are supported by the carrier 5 via supports
12 and by the stand 14 via further supports 13. As can be
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336
seen from Fig. 2, this adjustment drive 15 is arranged be-
tween the rails 11 and is pivotably mounted both on a car-
rier 16 mounted transversely to the rail direction and on
the displacement car 7.
In Fig. 1, the setting-on position 17 of the agitator
coil 8 is furthermore shown in a dot-and-dash line illus-
tration. For this purpose, both the carrier 16 and the ad-
justment drive 15 are removed and the displacement car 7 is
displaced on the rail 11 as far as to a rear stop 18. By a
crane (not shown) the agitator coil is lowered into a posi-
tion between the rails and fastened to the displacement car
by means of screws. By a pulling device introduced from the
side of the strand guide, the agitator coil is pulled into
the operation position in connection with the displacement
car 7 and the adjustment drive 15 is mounted with the
carrier 16 on the rail 11.
The section represented in Fig. 3, in an enlarged illus-
tration, shows a guide rail 11, which preferably is designed
as a hollow-box section, on which a wear ledge 19 is screwed,
whereupon the wheels 10 of the displacement car 7 are rolling.
A further preferred embodiment of the invention is
illustrated in Fig. 4, the same parts being denoted by
the same reference numerals. In this construction, the
agitator coil 8 is pivotable from an operation position,
drawn in full lines, adjusted to the strand guide 3, into
a retracted position, drawn in dot-and-dash lines, about
a horizontal axle 20 fastened to the stand. The agitator
coil 8 is detachablyfastened to a crosshead 21. Laterally
on the agitator coil, a rope drum 22 is arranged, which is
connected with a suspension means 26 on the agitator coil 8
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3i6
via a rope 23 and a pulle~ 25 fastened to a lateral carrier
24 of the strand guiding stand. By turning the rope drum 22,
thus changing the length of the rope, the agitator coil 8
now can be lowered from the operation position into the re-
tracted position by its own weight.
Advantageously, the pivot region is delimited by stops,
wherein, in the operation position, a stop 27 of the agita-
tor coil 8 coacts with a stop 28 o~ the casting arc and, in
the retracted position, the entire crosshead 21 rests on
10 carriers 29 of the casting stand.
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