JPH08206800A - Flow control device of molten metal - Google Patents

Abstract

PURPOSE: To reduce the number of linear motors for adjusting the distribution of the thrust to be given to the molten metal. CONSTITUTION: A flow control device is provided with a first linear motor 1E having electromagnet cores Ea, Eb and a plurality of electric coils E1-E12, a second linear motor 1L having electromagnet cores La, Lb and a plurality of electric coils L1-L12 which is opposite to the first linear motor across the molten metal, an energizing means 20F1 to apply the AC voltage to the linear motors, and a switching means P1 to switch the connection pattern of the AC voltage of each phase to be outputted by each of the electric coils L1-L12 of at least one of the first and second linear motors 1E, 1L and the energizing means 20F1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control device for adjusting the flow rate of molten metal, and particularly, but not intended to be limited to this, flow control of molten metal in a plurality of molds arranged in parallel. Regarding the device.

[0002]

2. Description of the Related Art In continuous casting of billets, for example, molten steel is poured into a mold from a tundish, and in the mold, the molten steel is gradually cooled and drawn from the wall surface of the mold. If the temperatures on the wall surfaces of the mold having the same height are not uniform, surface cracks and shell breakages are likely to occur. In order to improve this, conventionally, a linear motor arranged outside the long side of the mold or a linear motor facing the upper surface of the molten steel is used to apply an electromagnetic driving force (thrust) in a certain direction to the molten steel in the mold to drive the molten steel. It is actively fluidized. The thrust applied to the molten steel in the mold can be adjusted by the linear motor current.

[0003]

By the way, since the molten metal is divided by the mold and the molten steel is injected into the mold through a nozzle inserted substantially at the center of the mold, the flow velocity distribution of the molten steel in the horizontal cross section of the molten steel. Is not uniform, which is one of the causes of uneven temperature distribution. It is possible to regulate the non-uniform flow of molten steel by the injection of molten steel by the thrust of a linear motor, or to suppress the non-uniform flow and generate a stronger flow in the molten steel to make the temperature distribution uniform to some extent. -There is also a case where the temperature distribution cannot be made sufficiently uniform over the entire horizontal cross section of the molten steel, because the thrust force distribution itself is not uniform. On the other hand, in continuous casting using a mold having a relatively small cross section, for example, billet casting, a plurality of molds are arranged in parallel and simultaneously cast in respective molds, but since the mold shape is small, Even if you try to equip the molds with independent linear motors, it is difficult to install the linear motors because the linear motors of adjacent molds mechanically interfere with each other.If you reduce the size of the linear motors, sufficient thrust can be obtained. There is a possibility that you will not be able to. Further, the linear motors of the adjacent molds may cause electromagnetic interference and the thrust (direction, strength, distribution) as designed may not be applied to the molten steel in the mold.

The first object of the present invention is to adjust the distribution of the thrust applied to the molten metal, and the second object is to adjust the distribution of the thrust applied to the molten metal with as few linear motors as possible. To aim. The third purpose is to adjust the flow of the molten metal in each of the plurality of molds arranged in parallel, and the fourth purpose is to perform this with a linear motor that is as small as possible.

[0005]

SUMMARY OF THE INVENTION The flow control device of the present invention comprises an electromagnet core (Ea, Eb) having a plurality of slots extending in the x direction and distributed in the y direction, and a plurality of electric coils mounted in the slots. First linear mode having (E1 to E12)
(1E); an electromagnet core (La, Lb) having a plurality of slots extending in the x direction and distributed in the y direction and a plurality of electric coils (L1 to L12) mounted in the slots, A second linear motor (1L) facing the first linear motor with an intervening voltage between the first and second AC voltages having a phase difference that gives thrust to the molten metal (MM) along the slot arrangement direction y. Electric coil of linear motor (1E, 1L) (E1 to E12, L1 to L12)
Energizing means (20F1) for applying to each of the first and second linear motors (1E, 1L) and at least one (1L) electric coil (L1 to L12), and energizing means (20F1) Switching means for switching the connection pattern with each phase AC voltage output by
(P1); In addition, in order to facilitate understanding, symbols in parentheses are attached to corresponding elements of the embodiments shown in the drawings and described later for reference.

When the first and second linear motors (1E, 1L) are opposed to each other with a molten metal in between, the stronger the magnetic field generated by each linear motor, the stronger the mutual interference. Since the linear motor extending in the y-direction has different magnetic field distributions at the end and the middle, the mutual interference also differs at the end and the middle. When the connection (correspondence) between each of the electric coils of the linear motor and the AC voltage of each phase output by the energizing means is fixed, a thrust having a certain distribution in the y direction is applied to the molten metal. For example, a thrust distribution that is strong in the middle part and weak in the end part, and conversely, a weak thrust distribution in the middle part and strong end part appears. Switching means (P1)
The flow velocity distribution of the molten metal (MM) can be adjusted by switching the connection pattern with. In the case of continuous casting, it is preferable that the temperature distribution of the molten metal in the horizontal cross section of the mold is uniform, especially the temperature distribution along the inner wall surface of the mold, so that it is preferable to increase the flow velocity of the molten metal in a high temperature region. . Therefore, in a preferred embodiment of the present invention, the molten steel temperature is detected by the temperature detection means (t1 to t3), the control means (P2) determines the temperature distribution, and the thrust suitable for equalizing it in accordance with the temperature distribution. A connection pattern that brings about the distribution is selected and the switching means (P1) is instructed to set the connection pattern. As a result, the molten steel temperature in the mold becomes uniform.

As described above, when a plurality of molds each having a relatively small cross section are arranged side by side and simultaneously cast in the respective molds, since the mold shapes are small, the linear molds are independently provided to each mold. Hard to equip Therefore, in such an application, the present invention has an electromagnet core (Ea, Eb) having a plurality of slots extending in the x direction and distributed in the y direction, and a plurality of electric coils (E1 to E12) mounted in the slots. First
A linear motor (1E); an electromagnet core (La, Lb) having a plurality of slots extending in the x direction and distributed in the y direction, and a plurality of electric coils (L1 to L12) mounted in the slots,
A second linear motor (1) facing the first linear motor (1E) with a plurality of molten metal molds (M1 to M3) juxtaposed in parallel is placed therebetween.
L); AC voltage having a phase difference that gives thrust to the molten metal in the slot arrangement direction y is measured by the first and second linear motors.
Energizing means (20F1) for applying to the electric coil of the motor; and at least one of the electric coils of the first and second linear motors, and the alternating voltage of each phase output by the energizing means (20F1). A switching means (P1) for switching the connection pattern is provided.

According to this, since a common linear motor is arranged for a plurality of molds (M1 to M3), it is easy to dispose the linear motor. Switching means (P1)
By switching the connection pattern with, multiple molds (M
The flow rate of the molten metal (MM) can be adjusted in units of molds (M1 to M3) by increasing the flow rate of one molten metal (MM) (1 to M3) and decreasing the flow rate of the other. In its preferred embodiment,
The temperature detection means (t1 ~ t3) detects the molten steel temperature in each mold,
The control means (P2) determines the level of the molten steel temperature in units of molds (M1 to M3) and selects a connection pattern that provides a thrust distribution suitable for equalizing it in response to the high and low patterns, Switching means
Instruct (P1) to set the connection pattern. This allows
The molten steel flow velocity of the mold with high molten steel temperature increases.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the arrangement of linear motors according to an embodiment of the present invention. In the figure, M1, M2 and M3 are small continuous casting molds for billet production, and are a first mold, a second mold and a third mold. Molten steel MM is injected through the injection nozzle (not shown) from the front side to the back side of the paper surface of FIG. 1 (from the upper side to the lower side in the vertical direction z). Each mold M
Each side forming the square mold of 1, M2, M3 is a copper plate M
12, M22, M32, non-magnetic stainless steel plate M11,
It is a backing of M21 and M31.

In this embodiment, each mold M1, M2, M3
In order to drive the molten steel inside in a clockwise direction on the paper surface of FIG. 1 along each side of the mold with a three-phase linear motor,
The first and second electromagnet cores 1E and 1L face y on the outer side surfaces of the continuous casting molds M1, M2, M3 in the x direction, and
Molds M1, M2, M3 arranged in a row at equal intervals in the direction
Are arranged in parallel and symmetrically with respect to the mold rows M1 to M3. FIG. 2 shows an enlarged cross section of the second mold M2, the linear motor 1E, and the linear motor 1L (enlarged cross section taken along line 2A-2A in FIG. 1). In these drawings, the small numbers between the dimension leader lines (dashed-dotted lines) are the dimension values (m
m) is shown. The first linear motor 1E and the second linear motor 1L have the same size and the same electrical rating.

With reference to FIGS. 1 and 2, in this embodiment, the electromagnet core 1E is long in the y-direction and is long in the y-direction.
Is a stack of thin steel plates with flat plate surfaces in which twelve notches for slots are formed at an equal pitch. There are twelve slots, and each of the slots has an electric coil E1 to E1.
E12 is inserted. The electromagnet core 1E and the electric coils E1 to E12 are cooled and covered with a heat-resistant cover, but the cooling structure and the cover are not shown. The electromagnet core 1E has a comb shape having slots extending in the x direction on the lateral side, an electric coil is inserted into each slot, the teeth between the slots are magnetic poles, and the lower end surface of the electroforming cores M1, M2, and M3 are the same. It faces the side surface in the x direction. The electric coils E1 to E12 are “body wound” around the electromagnet core 1E.

In this embodiment, the electric coils E1 to E12 are
After the electromagnet core Ea having a width (x) of 345 mm is passed through the inner space of the electric coil E1, one side of the electric coils E1 to E12 is pushed into each slot. Therefore, the dimension of the inner space of the electric coils E1 to E12 in the width direction x is In the embodiment, it is 360 mm, and the depth (x) of the slot is 95 mm. Therefore, after pushing the electric coil into the slot, the upper side of the electric coil and the core 1 are
A gap of 110 mm is formed between the rear surface (lateral side surface) of E. Auxiliary core E in which rectangular thin steel plates are laminated in this void
b is inserted. Electromagnet core Ea and auxiliary core E
Both of the b's also have a cooling fluid passage, and a refrigerant pipe is connected to this, but these are not shown.

FIG. 3 shows the entire system configuration and connection of all electric coils of one embodiment of the present invention shown in FIG. 1, and FIG. 4 shows the configuration of the switch circuit P1 shown in FIG.

Each electric coil E1 of the first linear motor 1E
˜E12 are directly connected to the three-phase power supply connection terminals U11, V11, W11 of the power supply circuit 20F1 that generates a three-phase AC voltage, and this connection is fixed. On the other hand, each of the electric coils L1 to L12 of the second linear motor 1L is connected to the three-phase power supply connection terminal U of the power supply circuit 20F1 via the switch circuit P1.
11, V11, W11. The connection shown in FIG. 3 has two poles, and three-phase alternating current is applied to the electric coil. For example, the electric coils E1 to E1 of the first linear motor 1E
E12 is W, W, u, u, V, in this order in FIG.
It is represented as V, w, w, U, U, v, v. And "U" is the positive phase energization of the U phase of the three-phase AC (as it is energization)
"U" represents the reverse phase energization of the U phase (180 degrees out of phase from the U phase), and the U phase is applied to the winding start end of the electric coil "U", while the electric coil "U" means that the U phase is applied to the end of the winding. Similarly, “V” is the positive-phase energization of V-phase of three-phase AC, and “v” is V
"W" represents the W-phase positive phase energization of three-phase AC, and "w" represents the W-phase anti-phase energization.

The power supply connection terminals U11, V11 and W11 shown in FIG. 3 are electric coils E1 of the first linear motor 1E.
.. to E12, and are connected in parallel to the input terminals b2, b1 and b9 of the switch circuit P1, respectively. Other input terminals of switch circuit P1 (b3
~ B8, b10-b12), as shown in FIG.
Each electric coil L1 to L12 of the linear motor 1L
By switching the wiring between the output terminals a1 to a12 connected to the three-phase AC voltage phase (U, V,
W) is wired so that it can be switched.

Please refer to FIG. The switch circuit P1 is composed of six switches Sw1 to Sw6 which are 12-pole relays. Each of the switches Sw1 to Sw6 has a relay coil for driving the 12 sets of switch contacts, the 12 normally open contact pieces, and the 12 open / close contact pieces at once to energize the relay coils. It will be closed,
When power is turned off, it returns to open. Control circuit P shown in FIG.
2 is one of the switches Sw1 to Sw6 (Swx).
When x is any one of 1 to 6), the switch Swx is closed (12 sets of switch contacts are in contact with the normally open contact piece).
Becomes That is, it conducts.

The input contacts of the switch Sw1 are respectively connected to the input terminals b1 to b12 of the switch circuit P1, and the output contacts are respectively connected to the output terminals a1 to a12 of the switch circuit P1. When the switch Sw1 is closed (turned on), the input terminals b1 to b1 of the switch circuit P1 are
b12 and the output terminals a1 to a12 are connected.

The switches Sw2 to Sw6 have the same structure as the switch Sw1 and operate similarly to the switch Sw1. The input side connections of the switches Sw2 to Sw6 are exactly the same as the switch Sw1, and the input terminals b1 to b12 of the switch circuit P1 are connected to the input contacts of the switches Sw2 to Sw6 in the same manner as the input contacts of the switch Sw1. Has been done. However, the connection between the output side contact and the output terminals a1 to a12 of the switch circuit P1 is made by the switches Sw1 to Sw6.
Is different for each. Table 1 shows each switch S
Input terminals b1 to b12 and output terminals a1 to a12 of the switch circuit P1 when w1 to Sw6 are selectively turned on.
Represents a connection mode with.

[0020]

[Table 1]

Input terminals b1 to b12 of the switch circuit P1
Is connected to the power supply connection terminals U11, V11, W11 of the three-phase alternating current of the power supply circuit 20F1 as described above, and the second linear motor 1L depends on which of the switches Sw1 to Sw6 in the switch circuit P1 is turned on. To each electric coil L1 to L12 of each phase (U, V,
Which of W) is connected is determined.

FIG. 5 shows the electric coils E1 to E12 and L1.
The structure of the power supply circuit 20F1 which makes three-phase alternating current flow in L12 is shown. A thyristor bridge 22A1 for DC rectification is connected to the three-phase AC power supply (three-phase power line) 21, and its output (pulsating current) is an inductor 25A1 and a capacitor 26.
It is smoothed by A1. The smoothed DC voltage is applied to the power transistor bridge 27A1 for forming a three-phase AC, and the U-phase of the three-phase AC output from the power-transistor bridge 27A1 is supplied to the power supply connection terminal U11 shown in FIG. , W again
The phase is applied to the power supply connection terminal W11.

Electric coils E1 to E12, L1 to L12
However, molten steel MM inside the continuous casting mold (M1, M2, M3)
Voltage command value VdcA for generating thrust to drive
1 is given to the phase angle α calculator 24A1, and the phase angle α calculator 24A1 outputs the conduction phase angle α corresponding to the command value VdcA1.
(Thyristor trigger-phase angle) is calculated and a signal representing this is given to the gate driver 23A1. The gate driver 23A1 starts the phase counting of the thyristor of each phase from the zero-cross point of each phase, and the conduction trigger at the phase angle α.
To do. As a result, the direct current voltage indicated by the command value VdcA1 is applied to the transistor bridge 27A1.

On the other hand, the three-phase signal generator 31A1 has a frequency designated by the frequency command value Fdc (5 in the present embodiment).
0 Hz), a constant voltage three-phase AC signal is generated, and the comparator 2
Give to 9A1. The triangular wave generator 30A1 also supplies a constant voltage triangular wave of 3 KHz to the comparator 29A1. When the U-phase signal has a positive level, the comparator 29A1 is at a high level H (transistor on) when it is at or above the level of the triangular wave provided by the triangular wave generator 30A1, and at a low level L (transistor off) when it is below the level of the triangular wave. Signal of
The signal is output to the gate driver 28A1 to the positive section of the U phase (to the U phase positive voltage output transistor), and when the U phase signal is at the negative level, it is high when it is at or below the level of the triangular wave provided by the triangular wave generator 30A1. At the level H, when the level of the triangular wave is exceeded, a low level L signal is output to the gate driver 28A1 to the U-phase negative section (to the U-phase negative voltage output transistor). The same applies to the V-phase signal and the W-phase signal. The gate driver 28A1 energizes each transistor of the transistor bridge 27A1 to turn on and off in response to the signals addressed to the respective phases, positive and negative sections.

As a result, the power supply connection terminal U11 has three terminals.
A U-phase voltage of phase alternating current is output, a similar V-phase voltage is output to the power supply connection terminal V11, and a similar W-phase voltage is output to the power supply connection terminal W11. The inter-curve level is determined by the coil voltage command value VdcA1.
The frequency of the three-phase voltage is the frequency command value F in this embodiment.
It is 50 Hz by dc. That is, the peak voltage value (thrust) specified by the coil voltage command value VdcA1 is 50 Hz.
The three-phase AC voltage of the electric coil E1 shown in FIG. 1 and FIG.
To E12, L1 to L12.

Please refer to FIG. 3 again. Control circuit P2
Outputs the coil voltage command value VdcA1 and the frequency command value Fdc to the power supply circuit 20F1. In addition, continuous casting mold M
1, M2, M3 in the upper space near each side, the molten steel surface of the space in the mold (there may be powder)
Infrared temperature sensors t1, t2, and t3 aiming at are arranged, and temperature detection signals of those are given to the control circuit P2.

Generally speaking, the control circuit P2 digitally converts the temperature detection signals of the infrared temperature sensors t1, t2, t3, reads them, and averages the respective detected temperatures in time series t.
m is calculated, if the temperature tm is above a certain threshold value th, it is determined to be high temperature, and if it is less than th, it is determined to be low temperature, and the driving force for the molten steel MM in the mold determined to be high temperature is increased (the stirring speed is increased) , The relay energization signal for realizing the connection pattern by selecting the connection pattern (FIGS. 6 and 7) that lowers the driving force for the molten steel MM in the mold determined to be low temperature (reduces the stirring speed). To the switch circuit P1. That is, the control circuit P2 recognizes whether the temperature in the three continuous casting molds M1, M2, M3 is high or low and recognizes the three continuous casting molds M1, M1.
Phase arrangement that produces the electromagnetic force (thrust) distribution necessary to level the temperature of the molten steel MM in M2 and M3 (second linear motor 1
Phase assignment to the L electric coil), to determine the connection that produces the electromagnetic force of the phase arrangement, and to the switch circuit P1,
A switch (one of Sw1 to Sw6) that provides the connection is turned on, and the other switches output an energization instruction signal to turn off.

6 and 7, the phase arrangement of the electric coils L1 to L12 of the second linear motor 1L and the continuous casting molds M1 when the switches Sw1 to SW6 in the switch circuit P1 are turned on. The electromagnetic force (arrow; vector) acting on the molten steel MM in M2 and M3 is shown. 6 and 7, the first linear mode is shown in (a) and (d).
1E also shows the phase arrangement (fixed) of the data 1E, but other drawings (b),
The first linear motor 1 is shown in (c), (e) and (f).
Illustration of the phase arrangement of E is omitted.

8 and 9 show the control operation of the control circuit P2. When the power is turned on, the control circuit P2 first clears the register, the data memory, etc., and starts the timer Js (steps 1 to 3). In the following, in parentheses, the word "step" is omitted and only the step number is described. The control circuit P2 then digitally converts the temperature detection signals of the infrared temperature sensors t1, t2, t3 and reads them. That is, each continuous casting mold M1, M2, M3
The temperatures T1, T2, T3 of the upper surface of the molten steel MM (there may be powder) are read (4). Here, the oldest data in the first table (memory area) for reading / writing 16 pieces of data, which is assigned to write the temperature T1, is discarded and the temperature read this time is read. The data T1 is additionally written, and similarly, the oldest data of the second table (memory area) for reading / writing 16 data, which is allocated to the writing of the temperature T2. Is discarded, the temperature data T2 read this time is additionally written, and the temperature T3 is similarly written.
The oldest data in the third table (memory area) for reading / writing 16 data allocated to the writing of the data is discarded, and the temperature data T3 read this time is used. Additional writing.

Upon completion of this processing, the control circuit P2 confirms whether the content of the flag register IF is 1 (5), and if IF = 1 (reading 16 times has already been executed), then In step 6, 1 is added to the content n of the count register. If n is less than 16, wait for the timer Js to expire and return to step 3 (6 to 7 → 3). That is, the detected temperatures T1, T2, T3 are read at the sampling cycle Js. When the reading of 16 times is completed, the reading data of the past 16 times are filled in the first to third tables. Therefore, the control circuit P2 sets the flag register IF to 1. In step 5, it is judged whether or not the temperature data read to calculate the average value has finished reading as much as necessary to calculate the average value. Here, IF = 1
If so, that is, after repeating reading 16 times or more, the process proceeds to step 9.

In step 9, the molten steel MM in each continuous casting mold (M1, M2, M3) is read from the temperature data (3 sets, 16 sets in each set) read and stored in the first to third tables.
Average Tm of the past 16 times of temperatures T1, T2, T3
1, Tm2, Tm3 are calculated, and this is taken as the current temperature. The control circuit P2 is the molten steel MM in the first mold M1.
Temperature average value Tm1, average temperature Tm2 of molten steel MM in the second mold M2, and molten steel MM in the third mold M3
The average value Tm3 of the temperatures of 3 is compared with the threshold value Th (set value), and when the temperature is equal to or higher than Th, it is regarded as high, and when the temperature is lower than Th, it is regarded as low. Corresponding to the combination of "," the phase arrangement that gives high thrust to the molten steel in the "high" mold is determined, and the switch (one of Sw1 to Sw6) that brings the determined phase arrangement is turned on and the other is turned off. An energization command signal is output to the switch circuit P1.

That is, when the average value Tm1, Tm2, Tm3 of the temperature of the molten steel MM in each mold is equal to or higher than the threshold Th, it is [high], and when it is lower than the threshold Th, it is [low]. For example, when Tm1 [high], Tm2 [high], and Tm3 [high], the switches Sw2 to Sw6 are turned off and the switch S is turned off.
Turn on w1 (10, 11, 12, 17: mode φ
= 0: corresponding to (a) of FIG. 6).

Tm1 [high], Tm2 [high], Tm3
When it is [low], the switches Sw1 and Sw3 to Sw6 are turned off and the switch Sw2 is turned on (10, 11, 1).
2, 13: mode φ = 20: corresponding to (b) of FIG. 6).

Tm1 [high], Tm2 [low], Tm3
When it is [high], the switches Sw1 to Sw5 are turned off and the switch Sw6 is turned on (10, 11, 14, 15:
Mode φ = 300: (f) in FIG. 7).

Tm1 [high], Tm2 [low], Tm3
When it is [low], the switches Sw2 to Sw6 are turned off and the switch Sw1 is turned on (10, 11, 14, 16:
Mode φ = 0: corresponding to (a) of FIG. 6).

Tm1 [low], Tm2 [high], Tm3
When it is [low], the switches Sw1 and Sw2 to Sw4 to Sw6 are turned off and the switch Sw3 is turned on (10, 20,
21, 26: mode φ = 120: corresponding to (c) of FIG. 6).

Tm1 [low], Tm2 [high], Tm3
When [High], the switches Sw1 to 3, Sw5 and 6 are turned off and the switch Sw4 is turned on (10, 20, 2).
1, 22: mode φ = 180: corresponding to (d) of FIG. 7).

Tm1 [low], Tm2 [low], Tm3
At [High], the switches Sw1 to 4, Sw6 are turned off and the switch Sw5 is turned on (10, 20, 23, 2).
4: Mode φ = 240: Corresponding to (e) of FIG. 7).

Further, Tm1 [low], Tm2 [low], Tm
When it is 3 [low], the switches Sw2 to Sw6 are turned off and the switch Sw1 is turned on (10, 20, 23, 2).
5: mode φ = 0: corresponding to (a) of FIG. 6).

As a result, (a) to (a) of FIG. 6 and FIG.
Thrust as indicated by an arrow (vector) in (f) is applied to the molten steel MM of the three continuous casting devices M1, M2, M3,
High-temperature molten steel is driven to swirl strongly, the flow velocity along the inner wall surface of the mold in the horizontal section is high, and the temperature is uniformized rapidly.
Cooling by the mold works uniformly.

As described above, in the switch circuit P1, by switching the connection pattern between each phase voltage of the three-phase alternating current and each electric coil of the second linear motor 1L, the flow applied to the molten steel in each mold The drive thrust can be adjusted. An infrared temperature sensor-t1 to t3 detects the molten steel temperature of each mold, the control circuit P2 determines the temperature distribution (mold unit), and a connection pattern that provides a thrust distribution suitable for equalizing the temperature distribution. Since the switch circuit P1 is instructed to set the connection pattern by selecting the (phase arrangement), the flow rate of the high temperature molten steel becomes faster, and the cooling by the mold acts uniformly. Since the linear motors 1E and 1L are commonly arranged in a plurality of molds, it is easy to dispose the linear motors.

Although the above embodiment uses one set of linear motors 1E and 1L, similar linear motors are further arranged in the z direction, and a horizontal cross section is formed at each position in the z direction. The flow velocity distribution may be adjusted. Moreover, although the above-mentioned embodiment is intended for three templates, the number thereof is not particularly limited, and one template or four or more templates can be similarly applied. In the case of one, continuous molten steel in one mold is divided into virtual regions in the y direction, and each region is defined as a unit (1 in FIG. 1).
A connection pattern may be selected as the one corresponding to one mold) as in the above-mentioned embodiment. Furthermore, in the above embodiment, the first
Although the connection pattern (phase arrangement) of the linear motor 1E is fixed and only the connection pattern of the second linear motor 1L is selected, it is between the first linear motor 1E and the power supply circuit 20F1. It is also possible to insert a switch circuit similar to the switch circuit P1 so that the control circuit P2 also adjusts the connection pattern of the first linear motor 1E.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view showing an arrangement of a linear motor with respect to a mold according to an embodiment of the present invention.

FIG. 2 is a second mold M2 and a linear motor 1E shown in FIG.
FIG. 2 is a vertical sectional view of a linear motor 1L (a sectional view taken along line 2A-2A in FIG. 1).

FIG. 3 is a block diagram showing the overall configuration of the embodiment shown in FIG.

FIG. 4 is a block diagram showing an outline of a switch circuit P1 shown in FIG.

5 is an electric circuit diagram showing a configuration of a power supply circuit 20F1 shown in FIG.

FIG. 6A shows a switch S in the switch circuit P1.
A block diagram showing the phase arrangement of the linear motor 1L and the electromagnetic force (thrust) applied to the molten steel MM in the continuous casting molds M1, M2, M3 when w1 is turned on, (b) shows that the switch Sw2 is turned on. Is a block diagram showing the phase arrangement and electromagnetic force of the linear motor 1L when
It is a block diagram showing a phase arrangement and electromagnetic force of linear motor 1L when is turned on.

FIG. 7D shows a switch S in the switch circuit P1.
A block diagram showing the phase arrangement of the linear motor 1L when w4 is turned on and the electromagnetic force applied to the molten steel MM in the continuous casting molds M1, M2, M3, (e) is when the switch Sw5 is turned on. A block diagram showing the phase arrangement and electromagnetic force of the linear motor 1L, (f) is a block diagram showing the phase arrangement and electromagnetic force of the linear motor 1L when the switch Sw6 is turned on.

FIG. 8 is a flowchart showing a part of the control operation of the control circuit P2.

FIG. 9 is a flowchart showing the rest of the control operation of the control circuit P2.
It is a chart.

[Explanation of symbols]

1E, 1L: Linear motor 20F1: Power supply circuit a1 to a12: Output terminals b1 to b
12: Input terminals 1E, 1L, La, Lb: Electromagnet core Ea, Eb: Auxiliary core E1 to E12, L1 to L12: Electric coil MM: Molten metal M11, M21, M31: Non-magnetic stainless steel plate M12, M22, M
32: Copper plate M1, M2, M3: Continuous casting mold P1: Switch circuit P2: Control circuit Sw1 to Sw
6: Switch t1, t2, t3: Infrared temperature sensor U, V, W: AC voltage U11, V11, W11: Power supply connection terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B22D 27/02 U

Claims (4)

[Claims] 1. A first linear motor having an electromagnet core extending in the x direction and having a plurality of slots distributed in the y direction and a plurality of electric coils mounted in the slots; extending in the x direction and being distributed in the y direction. A second linear motor having an electromagnet core having a plurality of slots and a plurality of electric coils mounted in the slots and facing the first linear motor with a molten metal interposed therebetween; Energizing means for applying to the electric coils of the first and second linear motors an alternating voltage having a phase difference that gives a thrust along the molten metal; and electricity of at least one of the first and second linear motors. A molten metal flow control device comprising switching means for switching a connection pattern between each of the coils and each phase AC voltage output by the energizing means. 2. A detecting means for detecting the temperature of the molten metal; and, based on the detection value detected by the detecting means, a connection pattern which increases the thrust applied to the high temperature portion of the molten metal is selected, and the connection is selected. 2. The molten metal flow control device according to claim 1, further comprising control means for instructing the switching means to connect a pattern. 3. A first linear motor having an electromagnet core extending in the x direction and having a plurality of slots distributed in the y direction and a plurality of electric coils mounted in the slots; extending in the x direction and being distributed in the y direction. A second linear motor having an electromagnet core having a plurality of slots and a plurality of electric coils mounted in the slots, and a plurality of molten metal molds arranged in parallel with each other and facing the first linear motor. An energizing means for applying an AC voltage having a phase difference that gives thrust to the molten metal along the slot arrangement direction y to the electric coils of the first and second linear motors; and the first and second linear motors. A flow control device for molten metal, comprising: switching means for switching a connection pattern between each of the electric coils of at least one of the electric coils and the alternating voltage of each phase output by the energizing means. 4. A detection means for detecting the temperature of the molten metal in each mold; and a thrust force applied to the high temperature molten metal, corresponding to the high / low pattern of the temperature of the molten metal in each mold detected by the detection means. 4. The molten metal flow control device according to claim 3, further comprising a control means for selecting a connection pattern having a high value and instructing the switching means to connect the connection pattern.