JPH0777661B2 - Method for starting thin strip continuous casting equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to casting by a thin strip continuous casting apparatus having a moving cooling wall of a drum type, a belt type, etc., and a start method of the thin strip continuous casting. Regarding

[Conventional technology]

FIG. 4 is a schematic side view showing the start of continuous casting in a twin-drum type continuous casting apparatus which is an example of a conventional thin strip continuous casting apparatus having a moving cooling wall, and FIG. 5 is an enlarged perspective view of the main part thereof. Is.

As shown in FIGS. 4 and 5, when casting a strip steel having a thickness of 5 mm, for example, a strip-shaped dummy plate having a width equal to the length of the cooling drum A and having a thickness of 0.6 mm, for example. 1. Cut three trapezoidal shapes at the upper end and attach a heat-resistant heat insulating plate 2 having a thickness of 2.2 mm, for example, on both lower surfaces of the notch, insert it between both cooling drums A, and sandwich it. The other end (right side in the figure) of the dummy plate 1 is fixed to the winding device E with the cooling drum A spaced at 5 mm.

Next, the molten steel 3 is poured from the tan ditch C into the molten metal pool portion each consisting of the pair of cooling drums A and side dams B, and when the molten steel 3 reaches the notch at the tip of the dummy plate 1, it is dammed by the heat resistant heat insulating plate 2 and cooled. Simultaneously with the start of solidification, the cooling drum A is rotated as shown by the arrow, and while being moved to the right in FIG. 4 by the dummy plate 1 and the pinch roll D, it is wound by the winding device E, and then the dummy plate 1 is used. Then, the strip steel guided is wound into a coil.

[Problems to be solved by the invention]

When such continuous casting is started, it is desirable to start the rotation of the cooling drum A immediately after the lower part of the molten steel 3 is solidified and fixed to the dummy plate 1. However,
In the past, since it relied on the intuition of the operator, there was a problem that the start was too early or too late, the dummy plate 1 came off when the strip was drawn, and the molten steel 3 excessively solidified upward. Atsuta

〔Purpose〕

It is an object of the present invention to provide a starting method for continuous casting of thin strips which eliminates the above-mentioned conventional drawbacks.

[Means for solving problems]

Then, as a means for achieving the above object, the present invention installs a plurality of sensors having two electrodes on the upper end portion of the dummy plate so that the moving cooling wall is automatically started. It was done. That is, according to the present invention, a heat-resistant heat insulating plate adhered to both sides near the tip of a dummy plate for guiding a thin strip plate at the lower part of the hot water pool portion consisting of a pair of moving liquid walls and side dams is used as the moving cooling wall. In the starting method of the thin strip plate continuous casting device, which sandwiches and closes, activates the moving cooling wall by supplying molten metal to the molten metal pool, and draws the thin strip plate together with the dummy plate,
The heat resistant heat insulating plate is divided so that the electrode part at the tip of the sensor projects into the pool, and the sensor is directly fixed on the surface of the dummy plate between them with heat resistant adhesive. Provide three or more, two of those sensors
A method for activating a thin strip continuous casting apparatus, characterized in that the moving cooling wall is activated by detecting that the electrodes of one or more sensors are energized.

〔Example〕

FIG. 1 is a partial side sectional view showing a lower portion of the molten metal pool at the start of the continuous casting, and FIG. 2 is a perspective view showing mounting of each member in FIG. The same members as those of the conventional device are designated by the same reference numerals, and duplicated description will be omitted.

In FIGS. 1 and 2, reference numeral 4 denotes a sensor, which is composed of two electrodes 4a and a large number of heat-resistant insulating pieces 4b that cover the electrodes in a beaded shape.
The side surfaces of the dummy plate 1 are adhered to the divided heat-resistant and heat-insulating plate 2a below the cutouts of the tip end of the dummy plate 1 and the heat-resistant adhesives are applied to the cutouts so that the tips of the electrodes 4a are connected to the cutouts. It is protruding. The other end of each electrode 4a is connected via a multi-phase electric wire 5 to a starting device, such as an electrode switch, of a cooling drum driving device (not shown).

When starting the continuous casting of thin strip steel, as shown in FIG. 1, a dummy plate 1 having an integrated heat-resistant heat insulating plate 2 on the left side and a split-type heat resistant heat insulating plate 2a and a sensor 4 on the right side is attached.
The tip of the cooling drum A is inserted into the lower part of the hot water pool formed by the pair of cooling drums A and the side dams B.
Thus, the heat resistant heat insulating plates 2 and 2a and the sensor 4 are sandwiched and closed. Then, piezoelectric is applied to the electrode through the multi-phase electric wire 5, and the molten steel 3
When the water is poured, it reaches the dummy pyrate 1 projecting to the lower part of the pool, short-circuits the two electrodes of each sensor 4 and energizes the starter (not shown), and the cooling drum A
Rotate as indicated by the arrow. At the same time, the molten steel 3 poured into the molten metal pool is cooled by the cooling drum A to form a solidified shell 3a, which is fixed to the tip of the dummy plate 1 to become a thin strip plate. With the rotation,
It is guided by the dummy plate 1 and fed downward. In this case, when two of the three sensors 4 are energized,
A starter (not shown) is activated to prevent a start-up delay due to partial non-arrival of the molten steel 3. The sensor 4 descends downward together with the dummy plate 1, and the temperature of the tip of the dummy plate 1 is raised by the molten steel 3 to reduce the strength of the heat resistant adhesive. Peeling is caused by the working tension, and the fixing portion of the electrode 4a with the solidification shell 3a is cut and automatically separated from the dummy plate 1.

Next, a second embodiment is shown in FIG.

To the tip of the dummy plate 1 Dummy plate head 1a
Is attached by a heat-resistant adhesive via the insulating plate 9, and one electrode 6a is attached to the tip notch of the dummy plate head 1a.
3 sets of sensors 6 consisting of a heat-resistant insulating piece 6b and a heat-resistant insulating piece 6b are attached. This electrode 6a is connected to a starter (not shown) by a single-phase electric wire 8 and serves as the other electrode of the dummy plate head. 1a is also a single-phase electric wire 8 fixed by a clip 7.
Is connected to the activation device (not shown).

Then, the cooling drum drive device is started by the same operation as that of the first embodiment described above.

〔The invention's effect〕

As described in detail above, the present invention provides a sensor having two electrodes on the upper end of the dummy plate,
Since the structure of this sensor is simple, it can be easily installed at the start of this continuous casting, and the molten metal poured into the pool part short-circuits the two electrodes of the sensor to energize it for transfer cooling. Starting the wall has the effect that it is possible to automatically start the continuous casting.
The invention can also be provided with a plurality of sensors, which will trigger if a few of them are short-circuited, thereby reducing the probability of their activation.

[Brief description of drawings]

FIG. 1 is a partial side sectional view showing the lower part of the molten metal pool at the start of a twin-drum type thin strip steel continuous casting apparatus as one embodiment of the present invention, and FIG. 2 is a perspective view showing the mounting of the sensor in FIG. Fig. 3 is a perspective view of the second embodiment, Fig. 4 is a schematic side view showing the start of a drum type steel strip continuous casting device which is an example of a conventional device, and Fig. 5 is a main part of Fig. 4. It is the perspective view which expanded the part.

Claims (1)

[Claims] 1. A heat-insulating heat insulating plate, which is attached to both sides of a lower part of a basin of water containing a pair of moving cooling walls and side dams near a tip of a dummy plate for guiding a thin strip plate, is sandwiched between the moving cooling walls. Then, the molten metal is supplied to the pool to start the moving cooling wall, and the thin plate is continuously drawn out together with the dummy plate. The heat-resistant and heat-insulating plate is divided so that it projects into the pool, and the sensors are directly fixed to the surface of the dummy plate between them with a heat-resistant adhesive, and three or more such sensors are provided at intervals. The method for activating a thin strip continuous casting apparatus is characterized in that the moving cooling wall is activated by detecting that the electrodes of two or more of the sensors are energized.