JPH0320037B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] This invention relates to a heating device for a tundish in a continuous casting machine.

[Prior art and its problems] Continuous casting machines mainly used in the steel industry are equipped with a tundish as a device for quantitatively pouring molten metal and removing impurities from the molten metal before molding. The tandice itself was not equipped with a heating device. Therefore, once the temperature of the molten metal in the tundish drops, the molten steel sometimes solidifies near the tap nozzle of the tundish. Once the molten steel solidifies, a large amount of energy is required to remelt it, which is extremely uneconomical, and the loss due to the suspension of operation is also large.

In order to solve this problem, a shield block was installed between the hot water receiving chamber and the pouring chamber of the tundish.
An induction heating coil is installed in the hole made in this shield block, and two molten metal flow paths are provided in the shield block to link the magnetic field generated by the induction heating coil and the current path of the molten metal. A tundish that heats the molten metal by induction has been proposed.

FIG. 3 shows a tundish according to this proposal, in which the tundish body 1 has a protective chamber 3 made of a fireproof material provided on the inner periphery of a protective casing 2 made of a generally rectangular steel plate. Tanditetsu main body 1
A core 4 for induction heating is mounted in the center of the chamber, and a shield block 5 for partitioning the chamber 1a and pouring chamber 1b is removably installed.

The shield block 5 is made of a generally rectangular fireproof material, and has a vertically extending through hole 6 for inserting the core 4 in the center thereof.
Communication grooves 7 and 8 for communicating the and pouring chamber 1b
They are formed at the bottom of the shield block 5 and on both sides of the through hole 6.

The core 4 is formed into a rectangular ring shape, and an induction heating coil 4a is wound around one leg of the core 4, and the coil 4a is fitted into the through hole 6 of the shield block 5. The magnetic field generated by the coil 4a acts vertically across the molten metal within the tundish body 1.

Incidentally, insulating gaps 12 are provided in the protective case 2 in the vertical direction at appropriate positions in order to avoid the formation of a circular current path due to the above-mentioned magnetic field.

13 is a spout provided on the bottom of the tundish.

In the tundish constructed as described above, when molten metal is supplied to the receiving chamber 1a, the molten metal is also stored in the pouring chamber 1b through the communication grooves 7 and 8. Therefore, the hot water receiving chamber 1a, the hot water pouring chamber 1b, and the communication grooves 7, 8
A one-round path for the current is formed by the molten metal present in the molten metal.

Here, alternating current is supplied to the heating coil 4a to
is excited to link the magnetic field passing through the core 4 with the current path formed by the molten metal passing through the communication grooves 7 and 8, thereby inducing a large current in this current path. Then, joule heat is generated in the molten metal in the communication grooves 7 and 8, and the molten metal can be heated.

The heated molten metal is optionally poured out toward the strand (not shown) from the spout 13 by opening and closing a nozzle (not shown).

The cores used in this type of heating device are shown in Figures 4 and 5.
As shown in the figure, if a single-letter-shaped core element 15a and a U-shaped core element 15b are combined, in the case of the one in FIG. It is not easy to attach and detach. Further, in the case of FIG. 5, although the U-shaped core element 15b can be easily attached and detached, it is not easy to attach it to the single-letter-shaped core element 15a.

[Object of the Invention] The present invention was made in order to solve the above-mentioned problems, and an object thereof is to provide a heating device in which a core element can be easily assembled to a tundish body.

[Structure of the Invention] An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, core elements 16a, 1
6b are each formed in an L-shape, and the core element 1
Heating coil 4a is attached to 1 of the downward leg 16a of 6a.
is wound and vertically fitted into the through hole 6 of the shield block 5, with the lower end of its downward leg 16a1 projecting slightly below the tundish main body 1.

The upper leg 16b1 of the core element 16b is located outside the tundish main body 1, and the butt surface 16b2 at the upper end thereof is located on the butt surface 1 of the core element 16a.
6a2, and the butt surface 16b3 of the horizontal leg of the core element 16b abuts the butt surface 16a3 of the downward leg of the core element 16a, forming a rectangular frame-shaped core 4.

With this configuration, the core 4 and the tundish main body 1 can be attached and detached by simply moving the upper core element 16a in the vertical direction, making it easy to assemble and disassemble the core.

[Effects of the Invention] As described above, in this invention, the core of the heating device of the tundish dish is constructed by combining L-shaped pieces, so that the core can be easily attached to and removed from the tundish body. Become.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention; Fig. 2 is a cross-sectional view showing the core element in an exploded state; Fig. 2 is a cross-sectional view showing the core element in Fig. 1 combined; Fig. 3 is a tundish heating device 4 and 5 are cross-sectional views showing the shape of a conventional core. 1... Tanditetsu main body, 4... Core, 4a
...Coil, 5...Shiyahei Block, 7, 8...
...Communication hole, 16a, 16b...L-shaped core element.

Claims (1)

[Claims] 1 In the tundish that supplies molten metal to molds, etc., a shield block made of fireproof material is formed between the molten metal receiving chamber and the pouring chamber, and this shield block has a Two communicating holes are made at a predetermined interval, a pair of L-shaped core elements are removably combined into a rectangular shape, and an induction heating coil is provided on one leg of the L-shaped core elements. A tundish heating device characterized by being detachably connected in the vertical direction.