JPS61253152A - Separation type electromagnetic stirrer in continuous casting installation - Google Patents

Abstract

PURPOSE:To improve stirring efficiency and to permit the easier passage of a dummy bar by forming plural ingot passage ports with two pieces of inductor iron cores facing each other and providing a switch device between both iron cores. CONSTITUTION:The inductor iron core 18 and the inductor iron core 1 on one side are disposed to face each other and the switch device 13 is provided to the top end on the open side of the core 1. Coils 2-8 are further wound on the respective sides of the cores 1, 18 to constitute an inductor 19. The cores 1, 18 are separated by opening the device 13, by which the interference of a connecting arm 17 of the dummy bar 15 and the coil 5 is prevented and the passage of the dummy bar 15 is made easier. The ingot passes respectively through the port enclosed of the windings 5, 6, 7, 8 and the port enclosed of the windings 2, 3, 4, 5 when the device 13 is closed by the above-mentioned method. The molten steel stirring effect in the ingot is thus improved.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a rotating magnetic field type device used for efficiently stirring unsolidified molten steel in the shell of a slab by electromagnetic induction in continuous casting equipment for multi-strip slabs. This invention relates to an electromagnetic stirring device.

(Prior art) Conventional electromagnetic stirring devices for multi-strip continuous casting equipment include Japanese Patent Publication No. 59-52018 r “Electromagnetic Stirring Device for Duplex Continuous Casting Machine” and Japanese Patent Application No. 59-189391 r Continuous Casting Equipment There are conventional technologies such as electromagnetic stirring devices.

First, ``Electromagnetic Stirring Device for Duplex Continuous Casting Machine'' published in Japanese Patent Publication No. 59-52018R will be explained based on FIGS. 8(a) and 8(b). In FIG. 8(a), the slab 14 is supported and guided by a large number of slab support rolls 21, and the slab 14 is placed at the location necessary for stirring the molten steel on the slab support rolls 21.
A pair of inductors 19 are arranged so as to sandwich the inductors 19 between them, and as shown in FIG. 8(b), the unsolidified molten steel in the shells of the two strips of slab 14 is stirred by electromagnetic induction.

This pair of inductors 13 can change the width of the slab 14,
The surface facing the slab 14 is parallel to the upper and lower surfaces of the slab 14 and has a flat shape so that there is no need to replace the inductor 18 even if the slab 14 becomes one thread. Magnetic fields traveling in opposite directions were generated on two lower surfaces in one direction perpendicular to the traveling direction of the slab 14, and a rotational force was applied to the unsolidified molten steel in the shell to electromagnetically stir it.

FIG. 7 shows the "Electromagnetic Stirring Device for Continuous Casting Equipment" of Japanese Patent Application No. 59-189391, in which the shape of the inductor core 1 is glasses-shaped in order to apply stirring thrust to the sides of the slab 14.
Or, by arranging two or more slab passage ports in a line,
Coils 2 to 8 were wound around each side, and a rotating magnetic field was generated from the four sides of the slab cross section to the solidified molten steel on the inner surface of each of the multiple strips, thereby electromagnetically stirring.

(Problem to be solved by the invention) These conventional techniques have the following problems.

First, in FIGS. 8(a) and 8(b), which show ``Electromagnetic Stirring Device for Duplex Continuous Casting Machine'' published in Japanese Patent Publication No. 51-52018R, only the upper and lower two surfaces of the slab 14 are visible. Since no stirring thrust is applied, the stirring efficiency of the multi-strip slab 14 is significantly reduced. In particular, as the width of the slab 14 becomes smaller and the shape of the slab 14 approaches a square, the reduction in stirring efficiency becomes more significant.

In addition, in Fig. 7, which shows the patent application 18931/1983, ``Electromagnetic Stirring Device for Continuous Casting Equipment,'' the inductor core l has a spectacle-shaped shape or a shape with two or more slab passage ports arranged in a row. Therefore, when inserting the dummy par 15, the dummy par connecting arm 17 (see FIG. 4) interferes with the coil 5, causing a problem that the dummy par 15 cannot be inserted.

(Means for Solving the Problems) As shown in FIG. 2, the separate type electromagnetic stirring device according to the present invention has an inductor core 18 formed into a mouth shape on three sides, and two sides of the −-shaped inductor core. At least one side of the inductor core is disposed in parallel and inward thereof to form a plurality of passage holes through which the slab 14 passes, and the open end of the inductor core 18 is connected to the opening/closing device 13. The inductor core 1 is separably arranged, and the coils 2 to 11 are wound around each side of each inductor core 1.18 to form an inductor 19.

(Function) As shown in Figure 4, the inductor core l can be separated into two parts.
, 18 is opened by the opening/closing device 13, and there is no interference between the dummy bar connection arm 17 and the coil 5, and the dummy <-
15 can be passed.

Note that during casting stirring, as shown in Figure 2, the inductor core 1
The separated surfaces of and 18 are brought into close contact with each other by the opening/closing device 13, and stirring can be performed with almost no reduction in stirring efficiency.

(Example) The present invention will be explained based on illustrated embodiments.

FIG. 1 is a perspective view of an embodiment of the present invention, showing the appearance of a two-strip inductor. Figure 2 is a cross-sectional view of the inductor and q element shown in Figure 1, and Figure 3 is the inductor showing the direction of the current in the coil, the direction of the main magnetic flux, and the direction of the rotating magnetic field in Figure 2. Figure 4 is a cross-sectional view of the core, Figure 4 is an open view of the inductor core in Figure 2, Figure 5 is a perspective view showing the external appearance of a three-strand inductor, Figure 6 is a diagram of the current in the coil in Figure 5. FIG. 3 is a cross-sectional view of the inductor core showing the direction, the direction of the main magnetic flux, and the direction of the rotating magnetic field.

First, referring to FIGS. 1, 2, and 3, an electromagnetic stirring device "ξ" for continuous casting equipment for two strips, which is an embodiment of the present invention, will be described below.

It is wound around each side of the inductor cores 1 and 18 made of v1 layer of magnetic material of the glasses bottle with two openings so that the two strips of slab 14 can pass through, and at the part where the slab 14 passes through. Seven coils 2 to 8 are wound around inductor cores 1 and 18 so as to surround certain ports from four sides. The coil 5 wound around the side sandwiched between the two slabs 14 is commonly used to excite the slab 14 passing through each of the two openings.

Therefore, the coils 3, 5, and 7 are connected to AC power sources having the same phase and the same polarity, and the other paired windings 2.4 and 6.8 are connected to each other from the phase of the AC power source. Connect an AC power supply with a 90° phase delay. By doing this, the inductor core 1. The main flux in the inductor core 1. The cross-sectional area of I8 is minimized, and a two-phase, two-pole rotating magnetic field is simultaneously generated in the two slabs 14, and the molten steel in the slabs 14 is stirred.

The coils 2 to 8 are shaped in accordance with the cooling method 6, that is,
In the case of indirect cooling by immersion cooling, a solid conductor with water-resistant insulation on the outside is used, and in the case of direct cooling by internal water passage, a hollow conductor is used.In combination with direct cooling, a large current conductor is used to increase the cooling capacity. For thrust type combined cooling, use a hollow one with water-resistant insulation on the outside.

FIG. 2 shows coils 2 to 8 having cooling water passages 12. In FIG. 2, the slab 14 passes through the opening surrounded by the windings 5, 6.7 and 8 and the opening surrounded by the windings 2, 3.4 and 5.

When the phase of the AC power supply is π/2, windings 6.8 and 4
．． The magnetic field generated by windings 2, 3.4 and 5 is the largest, and the magnetic field generated by windings 7.5 and 3 is the smallest. Rotating magnetic fields are generated at the openings in the directions indicated by arrows A and B in FIG. 3, respectively.

Figure 4 shows the opening/closing device 1 in order to pass the dummy par 15.
3, the inductor cores 1 and 18 are opened to a position where the dummy pass connecting arm 17 does not interfere with the coil 5. Inductor core l and 18
The separation point from the dummy pad should be made so that it can pass through the dummy pa connecting arm 17, and can be divided into two parts.It can be any part on the side where the coils 3, 5.7 are in FIG. 4. In this embodiment, the bottom side of the figure is separated. ing.

Another embodiment of the present invention will be described based on FIGS. 5 and 6.

This embodiment is configured for three wires, and the inductor core 1.18 is formed with three ports, and two coils are placed on each side.
~11 are wound. There are 10 fills 2 to 11.

Similar to the two-strip embodiment shown in FIGS. 1, 2, and 3, AC voltages of the same phase are applied to coils 3, 5, 7, and 9, and coils 2, 4, 6, An AC voltage whose phase is delayed by π/2 from the AC voltage is applied to 8°10 and 11. At the opening surrounded by the windings 7, 9, 10 and 11, there is a zero wire which generates a rotating magnetic field in the direction shown by the arrow A-c in FIG.
The opening surrounded by windings 5, 6, 7 and 8 produces a rotating magnetic field in the direction indicated by arrow B in FIG. Also, winding 2
, 3.4 and 5 generate a rotating magnetic field in the direction shown by arrow C in FIG.

In this embodiment, the inductor cores 1 and 18 are separated at the bottom, as shown in FIG.

(Effects of the Invention) The electromagnetic stirring device in the continuous casting equipment for multi-strip slabs according to the present invention configures the inductor cores 1 and 18 to have a plurality of openings 11 through which the multi-strip slabs 14 pass. Since the slab 14 can be separated into two parts and a rotating magnetic field is generated inside the slab 14 from all four sides of the slab 14 cross section, the unsolidified molten steel in the slab 14 can be efficiently stirred, and the stream interval of the slab 14 can be shortened. Thus, the inductor 18 can be made small and compact, and can be easily passed through the dummy par 15.

As described above, the effects of the separate type AI stirring device of the present invention are great.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, showing the appearance of a two-strip inductor. FIG. 2 is a cross-sectional view of the inductor shown in FIG. 1, and FIG. 3 is a cross-sectional view of the inductor shown in FIG. Figure 4 is a cross-sectional view of the inductor core showing the direction of the current in the coil, the direction of the main magnetic flux, and the direction of the rotating magnetic field.
The figure is a perspective view of another embodiment of the present invention, showing the external appearance of a three-line inductor. FIG. 7 is a cross-sectional view of an inductor core, and FIG. 7 is a perspective view of an embodiment of the prior art, showing the appearance of a two-strip inductor. FIG. 8(a) is a longitudinal sectional view of another embodiment of the prior art, and FIG. 8(b) is a plan view of FIG. 8(a). 1.18...Inductor core, 2-11...Coil, 1
2...Cooling water passage, 13...Switching device, 14...
Slab, 15... Dummy pa-116... Dummy pa body, 17... Dummy pa connection arm, 19... Inductor.

Claims (1)

[Claims] In order to stir the unsolidified molten steel of the slab in continuous casting of multi-strip slabs, the inductor core has 18 three sides in an inductor having multiple passage holes through which the slab passes through, and a ■-shaped induction At least one side of the inductor core is disposed parallel to and inward of the two sides of the child core, forming a plurality of passage holes through which the slab 14 passes, and at the open end of the inductor core 18. The inductor core 1 is separably arranged in series with the switchgear 13, and the coils 2 to 11 are wound around each side of each inductor core 1, 18 to form the inductor 19. Separate electromagnetic stirring device.