A horizontal magnetic circuit type continuous casting electromagnetic stirrer

Abstract

The present application provides a horizontal magnetic circuit type continuous casting electromagnetic stirrer, which includes multiple groups of horizontal magnetic circuit components arranged along the axial direction of the yoke. The horizontal magnetic circuit components include coils wound around iron cores, a first horizontal magnetic circuit, and a second horizontal magnetic circuit; a first relay is connected to three of the wires of the coil through a first three-phase power supply; a second relay is connected to the other three wires of the coil through a second three-phase power supply; the first horizontal magnetic circuit or the second horizontal magnetic circuit is connected to a host computer. Based on the design of the horizontal magnetic circuit, a greater effective electromagnetic force can be generated. Therefore, the utilization efficiency of the electromagnetic field can be improved, and the heat generation of the electromagnetic stirrer can be reduced; at the same time, the coverage area of the generated stirring force is wider, further increasing the electromagnetic density of the working surface and improving the stirring force intensity on the molten metal, thereby expanding the equiaxed crystal zone of the billet, reducing the segregation degree, and improving the internal quality of the billet.

Description

Technical Field

[0001] This application belongs to the technical field of metallurgical continuous casting electromagnetic stirrers, and particularly relates to a horizontal magnetic circuit type continuous casting electromagnetic stirrer. Background Art

[0002] Electromagnetic metallurgy technology utilizes the thermal effect and force effect of electromagnetic fields, etc., to achieve the control of energy transmission and fluid flow in the metallurgical process, thereby achieving the purpose of optimizing the metallurgical process, improving product quality, and enhancing production efficiency and performance. It is found that electromagnetic hydrodynamics phenomena are generated when a magnetic field and an electric field act on liquid metal together, and applying them to metallurgical production forms a series of electromagnetic metallurgy technologies such as electromagnetic braking, electromagnetic stirring, and electromagnetic soft contact, which are called material electromagnetic processes. Among them, electromagnetic stirring technology has become the most critical technology in the continuous casting process because of its irreplaceable role in aspects such as the stability of continuous casting operation, improvement of metal yield, improvement of the quality of continuous casting billets, increase in equiaxed crystal ratio, and reduction of central segregation.

[0003] During continuous casting, the basic principle of electromagnetic stirring to improve the internal quality of continuous casting billets is that an electromagnetic stirrer powered by alternating current generates an alternating electromagnetic field that gradually penetrates into the molten steel in the billet. Due to electromagnetic induction and the interaction between the current-carrying conductor and the magnetic field, an induced current is generated in the molten steel. This induced current interacts with the local magnetic field to generate an electromagnetic force, thereby driving the molten steel to move and uniforming the temperature field and solute field. Thus, the cleanliness of steel is improved, the equiaxed crystal zone of the billet is expanded, channel segregation is reduced, central porosity and central shrinkage are alleviated or eliminated, and the internal quality of the billet is greatly improved.

[0004] Currently, electromagnetic stirrers are divided into two types: continuous casting electromagnetic stirrers based on the design of rotating magnetic circuits and continuous casting electromagnetic stirrers based on the design of traveling wave magnetic circuits. The rotating magnetic circuit is a closed magnetic circuit into which three-phase electricity is introduced, and the phase angle is 120°. The electromagnetic force generated by the continuous casting electromagnetic stirrer based on the rotating magnetic circuit design is in the tangential direction of the billet, and it cannot promote the longitudinal flow of the molten steel along the billet pulling direction. Therefore, the action range of this tangential electromagnetic force is limited and cannot act on the molten steel in the entire billet, which is likely to cause the formation of internal defects such as "bright bands" in the billet. The traveling wave magnetic circuit is an open magnetic circuit into which two-phase electricity is introduced, and the phase angle is 90°. The continuous casting electromagnetic stirrer based on the traveling wave magnetic circuit design can generate an electromagnetic force along the billet pulling direction. However, due to the small phase angle of the traveling wave magnetic circuit, insufficient phase angle leads to discontinuous pole switching and abnormal superposition of magnetic field strength in some areas. It is necessary to increase the winding density or the iron core volume to compensate for the magnetic field strength. Moreover, the coil generates a large amount of heat during the use of the traveling wave electromagnetic stirrer, and a large amount of cooling water is required to cool the coil. Therefore, the continuous casting electromagnetic stirrer designed with a traveling wave magnetic circuit has a large volume, low useful power, high energy consumption, and serious waste of water resources.

[0005] Therefore, a horizontal magnetic circuit type continuous casting electromagnetic stirrer is proposed. Summary of the Invention

[0006] Therefore, the present application provides a horizontal magnetic circuit type continuous casting electromagnetic stirrer, which solves at least one technical problem existing in the prior art.

[0007] To solve the above problems, the present application provides a horizontal magnetic circuit type continuous casting electromagnetic stirrer, which includes a plurality of groups of horizontal magnetic circuit components arranged along the axial direction of the yoke. The horizontal magnetic circuit components include coils wound around iron cores, and the coils include six strands of wires.

[0008] A first horizontal magnetic circuit, the first horizontal magnetic circuit includes a first relay and a first three-phase power supply. One end of the first relay is connected to the first three-phase power supply, and three of the strands of wires of the coil are correspondingly connected to the other end of the first relay.

[0009] A second horizontal magnetic circuit, the second horizontal magnetic circuit includes a second relay and a second three-phase power supply. One end of the second relay is connected to the second three-phase power supply, and the other three strands of wires of the coil are correspondingly connected to the other end of the second relay.

[0010] A host computer, the first horizontal magnetic circuit or the second horizontal magnetic circuit is connected to the host computer. The host computer is used to control the current flow path in the first horizontal magnetic circuit and the second horizontal magnetic circuit, so that the current flow paths in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite.

[0011] Optionally, the first horizontal magnetic circuit further includes a first diode, and the second horizontal magnetic circuit further includes a second diode. The first diode and the second diode are used to absorb the back electromotive force generated when the coil is powered off.

[0012] Optionally, the coil is a solenoid winding wound around the iron core.

[0013] Optionally, the cross-sectional shape of the yoke is circular, semi-circular or horseshoe-shaped.

[0014] Optionally, at least two groups of the horizontal magnetic circuit components are arranged on the circular yoke.

[0015] Optionally, at least one group of the horizontal magnetic circuit components is arranged on the semi-circular yoke.

[0016] Optionally, the horseshoe-shaped yoke includes a semi-circular yoke and a strengthening magnetic circuit plate. The two ends of the semi-circular yoke are respectively connected with the strengthening magnetic circuit plates.

[0017] Optionally, at least three groups of the horizontal magnetic circuit components are arranged on the horseshoe-shaped yoke.

[0018] Optionally, the inner diameter of the circular yoke is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm;

[0019] The inner diameter of the semi-circular yoke is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm;

[0020] The inner diameter of the horseshoe-shaped yoke is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm.

[0021] Optionally, the installation position of the horizontal magnetic circuit type continuous casting electromagnetic stirrer on the continuous caster is determined by the equiaxed crystal volume fraction, and the equiaxed crystal volume fraction range is 0.35 to 0.65.

[0022] By means of the above technical solutions, the invention of the present application has at least the following beneficial effects:

[0023] The embodiment of the present application provides a horizontal magnetic circuit type continuous casting electromagnetic stirrer. By connecting three of the wires of the coil to the first three-phase power supply of the first horizontal magnetic circuit and the other three wires to the second three-phase power supply of the second horizontal magnetic circuit, a three-phase power supply with a phase angle of 120° is passed through the coil, so that the current directions in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite and in the same horizontal plane. In this way, an electromagnetic force parallel to the drawing direction of the slab can be generated, thereby increasing the action range of the electromagnetic force, so that it can act on the molten steel in the entire slab, avoiding the formation of internal defects such as "bright band" in the slab, and at the same time improving the segregation degree of the slab; at the same time, it has the advantages of low loss and low energy consumption of the continuous casting electromagnetic stirrer with a rotating magnetic circuit design; at the same time, it has the longitudinal electromagnetic force function of the continuous casting electromagnetic stirrer based on the traveling wave magnetic circuit design.

[0024] The embodiment of the present application provides a horizontal magnetic circuit type continuous casting electromagnetic stirrer. Based on the design of the horizontal magnetic circuit, a larger effective electromagnetic force can be generated. Therefore, the use efficiency of the electromagnetic field can be improved, the heat generation of the coil of the electromagnetic stirrer can be reduced, and the waste of cooling water resources can be avoided; at the same time, the stirring force generated by the electromagnetic stirrer with a horizontal magnetic circuit design is an electromagnetic force along the drawing direction. This electromagnetic force can promote the longitudinal flow of the molten steel inside the slab, and the coverage area of the stirring force is wider, further increasing the electromagnetic density of the working surface and improving the stirring force intensity on the molten metal, thereby expanding the equiaxed crystal zone of the slab, reducing segregation, and improving the internal quality of the slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the magnetic circuit wiring diagram of the horizontal magnetic circuit type continuous casting electromagnetic stirrer according to the embodiment of the present application;

[0026] Figure 2 An electromagnetic stirrer with a circular yoke based on a horizontal magnetic circuit design according to an embodiment of the present application;

[0027] Figure 3 An electromagnetic stirrer with a semi-circular yoke based on a horizontal magnetic circuit design according to an embodiment of the present application;

[0028] Figure 4 An electromagnetic stirrer with a horseshoe-shaped yoke based on a horizontal magnetic circuit design according to an embodiment of the present application;

[0029] Figure 5 The electromagnetic field distribution generated by the electromagnetic stirrer with a circular yoke based on a horizontal magnetic circuit design according to an embodiment of the present application on a round billet;

[0030] Figure 6 The stirring force distribution generated by the electromagnetic stirrer with a circular yoke based on a horizontal magnetic circuit design according to an embodiment of the present application on a round billet;

[0031] Figure 7 The electromagnetic force distribution in the diameter direction of a round billet by the horizontal magnetic circuit type continuous casting electromagnetic stirrer, the rotating magnetic circuit type electromagnetic stirrer, and the traveling wave magnetic circuit type electromagnetic stirrer according to an embodiment of the present application;

[0032] Figure 8 The streamline diagram inside the solidifying liquid core of a round billet under the action of the electromagnetic stirrer with a circular yoke based on a horizontal magnetic circuit design according to an embodiment of the present application.

[0033] The reference signs are shown as:

[0034] 1. Yoke; 2. Iron core; 3. Coil; 4. Reinforcing magnetic circuit plate; A1. First relay; B1. Second relay; P1. First diode; P2. Second diode. Detailed implementation manners

[0035] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0037] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention and are not intended to limit the present invention.

[0039] See in conjunction with Figures 1 to 8 As shown, according to an embodiment of the present application, a horizontal magnetic circuit type continuous casting electromagnetic stirrer is provided, which includes a plurality of groups of horizontal magnetic circuit components arranged along the axial direction of the yoke 1. The horizontal magnetic circuit components include coils 3 wound around iron cores 2, and the coils 3 include six strands of wires;

[0040] A first horizontal magnetic circuit, the first horizontal magnetic circuit includes a first relay A1 and a first three-phase power supply. One end of the first relay is connected to the first three-phase power supply, and three of the wires of the coil 3 are correspondingly connected to the other end of the first relay;

[0041] A second horizontal magnetic circuit, the second horizontal magnetic circuit includes a second relay B1 and a second three-phase power supply. One end of the second relay is connected to the second three-phase power supply, and the other three of the wires of the coil 3 are correspondingly connected to the other end of the second relay;

[0042] A host computer, the first horizontal magnetic circuit or the second horizontal magnetic circuit is connected to the host computer, and the host computer is used to control the current flow path in the first horizontal magnetic circuit and the second horizontal magnetic circuit so that the current flow paths in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite.

[0043] By connecting three of the wires of the coil to the first three-phase power supply of the first horizontal magnetic circuit and the other three wires to the second three-phase power supply of the second horizontal magnetic circuit, a three-phase power supply with a phase angle of 120° is passed through the coil, so that the current directions in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite and in the same horizontal plane. In this way, an electromagnetic force parallel to the casting direction of the billet can be generated, thereby increasing the action range of the electromagnetic force, so that it can act on the molten steel in the whole billet, avoiding the formation of internal defects of the "bright band" billet, and at the same time improving the segregation degree of the billet; at the same time, it has the advantages of low loss and low energy consumption of the continuous casting electromagnetic stirrer with a rotating magnetic circuit design; at the same time, it has the longitudinal electromagnetic force function of the continuous casting electromagnetic stirrer based on the traveling wave magnetic circuit design. Based on the design of the horizontal magnetic circuit, a larger effective electromagnetic force can be generated. Therefore, the use efficiency of the electromagnetic field can be improved, the heat generation of the coil of the electromagnetic stirrer can be reduced, and the waste of cooling water resources can be avoided; at the same time, the stirring force generated by the electromagnetic stirrer with the horizontal magnetic circuit design is the electromagnetic force along the casting direction. This electromagnetic force can promote the longitudinal flow of the molten steel inside the billet, and the coverage area of the stirring force is wider, further increasing the electromagnetic density of the working surface and improving the stirring force intensity on the molten metal, thereby expanding the equiaxed crystal zone of the billet, reducing segregation, and improving the internal quality of the billet.

[0044] Among them, as Figure 1 described, the input ends of the three-phase power supply are represented by A, B, and C. The phase angles of the first three-phase power supply and the second three-phase power supply are both 120°, and the three phase angles of the three-phase power supply differ by 120°, so that at any moment, the vector sum of the voltages and currents of the three phases is zero. This means that the powers of the three phases can complement each other, thus realizing a more stable power output.

[0045] Figure 1 In the electromagnetic stirrer coil designed based on the horizontal magnetic circuit, a set of coils is composed of six wires, and three of the wires are connected to the AAB three phases in the first horizontal magnetic circuit (that is, Figure 1 the left part). The remaining three wires are connected to the ABC three phases in the second horizontal magnetic circuit (that is, Figure 1 the right part); the purpose of this wiring is that the shunt resistors between the three phases can transfer the reactive power between the two phases. Therefore, it will cause the three-phase power supply to be unbalanced. This kind of reactive power generally stems from factors such as unstable power grid or power grid cable loss. In this way, the current passed through the magnetic circuit is stable.

[0046] Among them, three of the wires of coil 3 are connected to the first horizontal magnetic circuit, and the other three wires are connected to the second horizontal magnetic circuit. The purpose is to make the current flow paths in the same coil 3 opposite, but in the same horizontal plane. Therefore, the generated magnetic fields are also opposite in direction and in the same horizontal plane.

[0047] Among them, the first horizontal magnetic circuit includes a first relay A1, and the second horizontal magnetic circuit includes a second relay B1. The current directions in the first relay A1 and the second relay B1 are opposite. Therefore, the current directions in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite.

[0048] Among them, the first horizontal magnetic circuit or the second horizontal magnetic circuit is connected to the host computer, and the host computer is used to control the current flow paths in the first horizontal magnetic circuit and the second horizontal magnetic circuit to be opposite.

[0049] That is to say, through the FI magnetic circuit control node in the host computer, the current flow path in the first horizontal magnetic circuit or the second horizontal magnetic circuit is controlled so that the current flow paths in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite and in the same horizontal plane. Therefore, the generated magnetic fields are also opposite in direction and in the same horizontal plane.

[0050] Specifically, the host computer consists of a multi-pole multi-stage PID algorithm controller, and uses the modbus or tcp / dtu transmission protocol and the DAQ data storage unit for data storage. Through the coordinated work of these modules, complex automated electromagnetic circuit tasks are executed.

[0051] The first horizontal magnetic circuit further includes a first diode P1, and the second horizontal magnetic circuit further includes a second diode P2. The first diode P1 and the second diode P2 are used to absorb the back electromotive force generated when the coil 3 is powered off.

[0052] Among them, the number of the first diode P1 in the first horizontal magnetic circuit and the second diode P2 in the second horizontal magnetic circuit is two each, which are used to absorb the back electromotive force generated when the coil 3 is powered off and protect the components in the circuit.

[0053] The coil 3 is a solenoid winding wound around the iron core 2.

[0054] Among them, the wire in the solenoid winding is a flat wire.

[0055] The cross-sectional shape of the yoke 1 is circular, semi-circular and horseshoe-shaped.

[0056] The circular cross-section yoke has a relatively uniform magnetic field distribution, which can effectively reduce the local concentration of magnetic flux density, thereby reducing the magnetic saturation phenomenon. The circular cross-section has good structural symmetry and can withstand higher mechanical stress, which is suitable for electromagnetic devices with high power density.

[0057] The semi-circular cross-section yoke is suitable for use in an environment with limited space and can better adapt to a specific installation position. The magnetic field distribution of the semi-circular yoke has a certain directionality, and the magnetic force lines usually diverge or concentrate along the tangent direction of the semi-circle, which is suitable for occasions where a specific magnetic field distribution is required.

[0058] The U-shaped structure of the horseshoe yoke makes the magnetic poles point in the same direction, which can significantly enhance the magnetic field strength and increase the magnetic flux density. Due to the concentrated magnetic field, the horseshoe yoke shows a stronger attraction when adsorbing metal objects and is suitable for picking up metal objects.

[0059] Furthermore, the iron core 2 is prepared from 12CrNi3A steel, and the iron core 2 is welded to the yoke 1.

[0060] At least two sets of the horizontal magnetic circuit components are arranged on the circular yoke 1.

[0061] Among them, at least two sets of the horizontal magnetic circuit components are arranged on the circular yoke 1. As Figure 1 shown, there are two sets of horizontal magnetic circuit components, and the two sets of horizontal magnetic circuit components are arranged oppositely. They can generate a mutually superimposed magnetic field, thus significantly enhancing the magnetic field strength; the two sets of horizontally arranged magnetic circuit components can achieve more efficient energy transmission. By optimizing the coupling degree of the coils 3 in the horizontal magnetic circuit components, energy loss can be reduced and transmission efficiency can be improved.

[0062] Specifically, three iron cores 2 with coils 3 are arranged at equal intervals in the vertical direction for each set of horizontal magnetic circuit components.

[0063] Figure 5 This is the electromagnetic field distribution generated by the electromagnetic stirrer with a circular yoke designed based on the horizontal magnetic circuit in the present application embodiment on the round billet; through the Ansys Maxwell numerical simulation method, an electromagnetic stirrer with a circular yoke designed based on the horizontal magnetic circuit is established, and the magnetic induction intensity distribution of this electromagnetic stirrer on the round billet is obtained. It can be seen that the magnetic field strength generated by this electromagnetic stirrer that can effectively act on the round billet has a wider coverage and higher intensity.

[0064] Figure 6 This is the stirring force distribution generated by the electromagnetic stirrer with a circular yoke designed based on the horizontal magnetic circuit in the present application embodiment on the round billet; through the Ansys Maxwell numerical simulation method, for the electromagnetic stirrer with a circular yoke designed based on the horizontal magnetic circuit, the stirring force of this electromagnetic stirrer on the round billet is obtained. It can be seen that the stirring force generated by this electromagnetic stirrer that can effectively act on the round billet has a wider coverage and higher intensity. And the direction of the stirring force is the electromagnetic force along the billet drawing direction.

[0065] At least one set of the horizontal magnetic circuit components is arranged on the semi-circular yoke 1.

[0066] Among them, as Figure 3 shown, in this embodiment, one set of horizontal magnetic circuit components is arranged on the semi-circular yoke 1.

[0067] Specifically, three iron cores 2 with coils 3 are arranged at equal intervals vertically in the horizontal magnetic circuit assembly.

[0068] As Figure 4 shown, the U-shaped yoke 1 includes a semi-circular yoke and a reinforcing magnetic circuit plate 4. The two end parts of the semi-circular yoke are respectively connected with a reinforcing magnetic circuit plate 4.

[0069] By connecting the reinforcing magnetic circuit plates 4 at the two end parts of the semi-circular yoke, the optimization of the magnetic field distribution and the reduction of magnetic leakage are realized. At the same time, the magnetic circuit efficiency is improved and the energy loss is reduced.

[0070] At least three groups of horizontal magnetic circuit assemblies are arranged on the U-shaped yoke 1.

[0071] Among them, in this embodiment, one group of horizontal magnetic circuit assemblies is arranged inside the semi-circular yoke; the other two groups of horizontal magnetic circuit assemblies are arranged on the reinforcing magnetic circuit plates 4. That is to say, one group of horizontal magnetic circuit assemblies is correspondingly arranged on one reinforcing magnetic circuit plate 4.

[0072] Specifically, three iron cores 2 with coils 3 are arranged at equal intervals vertically in the horizontal magnetic circuit assembly.

[0073] The inner diameter of the circular yoke 1 is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm;

[0074] The inner diameter of the semi-circular yoke 1 is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm;

[0075] The inner diameter of the U-shaped yoke 1 is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm; the thickness of the reinforcing magnetic circuit plate 4 is 300 mm to 500 mm, and the height is 1000 mm to 1500 mm.

[0076] Table 1 Comparison of the magnetic induction intensities generated at the center of the electromagnetic stirrers with different magnetic circuit designs under different currents

[0077]

[0078] By comparing the magnetic induction intensities at the center of the rotating magnetic circuit, traveling wave magnetic circuit and horizontal magnetic circuit under different currents, the magnetic induction intensity of the horizontal magnetic circuit electromagnetic stirrer is increased by an average of 150 Gs compared with the rotating magnetic circuit, and the magnetic induction intensity of the horizontal magnetic circuit electromagnetic stirrer is increased by an average of 300 Gs compared with the traveling wave magnetic circuit.

[0079] Figure 7Electromagnetic force distribution in the diameter direction of the horizontal magnetic circuit continuous casting electromagnetic stirrer, rotary magnetic circuit electromagnetic stirrer, and traveling wave magnetic circuit electromagnetic stirrer according to the embodiments of the present application; The electromagnetic stirrer (circular, semi-circular, and horseshoe-shaped) constructed based on the horizontal magnetic circuit can generate a greater effective electromagnetic force. This horizontal magnetic circuit electromagnetic stirrer has higher efficiency and saves energy consumption.

[0080] The installation position of the horizontal magnetic circuit continuous casting electromagnetic stirrer on the continuous casting machine is determined by the equiaxed crystal volume fraction, where the equiaxed crystal volume fraction ranges from 0.35 to 0.65.

[0081] Figure 8 Flow streamline diagram inside the solidified liquid core of the round billet under the action of the electromagnetic stirrer with a circular magnetic yoke designed based on the horizontal magnetic circuit according to the embodiments of the present application; The installation position of the horizontal magnetic circuit continuous casting electromagnetic stirrer on the continuous casting machine is determined by the equiaxed crystal volume fraction, where the equiaxed crystal volume fraction ranges from 0.35 to 0.65. Under the action of the electromagnetic stirrer with a circular magnetic yoke designed based on the horizontal magnetic circuit, there are two longitudinal circulation flow patterns in the liquid core of the round billet (counterclockwise circulation flow on the left and clockwise circulation flow pattern on the right). This circulation pattern promotes the mutual mixing between the high-temperature and low-solute melt in the upper part of the liquid core and the low-temperature and high-solute melt in the lower part of the liquid core and the solidification front, thereby improving the uniformity of the temperature and solute distribution in the liquid core and enhancing the internal quality of the cast billet.

[0082] Based on the application of the horizontal magnetic circuit continuous casting electromagnetic stirrer on the continuous casting machine, such as the end face dimensions of square billets: 160mm×160mm, 200mm×240mm, 240mm×240mm, 280mm×360mm, 280mm×380mm, and 325mm×380mm. The cross-sectional dimensions of round billets: Φ350mm, Φ450mm, Φ500mm, Φ550mm, Φ650mm, and Φ800mm.

[0083] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0084] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in the technical field of the present application, several improvements and variations can be made without departing from the technical principle of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A horizontal magnetic circuit type continuous casting electromagnetic stirrer, characterized in that, It includes multiple groups of horizontal magnetic circuit components arranged axially along the yoke (1). The horizontal magnetic circuit components include a coil (3) wound around an iron core (2), a first horizontal magnetic circuit, and a second horizontal magnetic circuit. The coil (3) includes six strands of wire; The first horizontal magnetic circuit includes a first relay (A1) and a first three-phase power supply. One end of the first relay is connected to the first three-phase power supply, and three of the strands of wire of the coil (3) are correspondingly connected to the other end of the first relay; The second horizontal magnetic circuit includes a second relay (B1) and a second three-phase power supply. One end of the second relay is connected to the second three-phase power supply, and the other three strands of wire of the coil (3) are correspondingly connected to the other end of the second relay; A host computer. The first horizontal magnetic circuit or the second horizontal magnetic circuit is connected to the host computer. The host computer is used to control the current flow path in the first horizontal magnetic circuit and the second horizontal magnetic circuit so that the current flow paths in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite.

2. The horizontal magnetic circuit type continuous casting electromagnetic stirrer according to claim 1, characterized in that, The first horizontal magnetic circuit further includes a first diode (P1), and the second horizontal magnetic circuit further includes a second diode (P2). The first diode (P1) and the second diode (P2) are used to absorb the back electromotive force generated when the coil (3) is powered off.

3. The horizontal magnetic circuit type continuous casting electromagnetic stirrer according to claim 1, characterized in that, The coil (3) is a solenoid winding wound around the iron core (2).

4. A horizontal magnetic circuit type continuous casting electromagnetic stirrer according to claim 1, characterized in that, The cross-sectional shape of the yoke (1) is circular, semi-circular, or horseshoe-shaped.

5. A horizontal magnetic circuit type continuous casting electromagnetic stirrer according to claim 4, characterized in that At least two groups of the horizontal magnetic circuit components are arranged on the circular yoke (1).

6. The horizontal magnetic circuit type continuous casting electromagnetic stirrer according to claim 4, characterized in that, At least one group of the horizontal magnetic circuit components is arranged on the semi-circular yoke (1).

7. A horizontal magnetic circuit type continuous casting electromagnetic stirrer according to claim 4, characterized in that, The horseshoe-shaped yoke (1) includes a semi-circular yoke and a strengthening magnetic circuit plate (4). The two end parts of the semi-circular yoke are respectively and correspondingly connected with the strengthening magnetic circuit plate (4).

8. The horizontal magnetic circuit type continuous casting electromagnetic stirrer according to claim 7, wherein At least three groups of the horizontal magnetic circuit components are arranged on the horseshoe-shaped yoke (1).

9. The horizontal magnetic circuit type continuous casting electromagnetic stirrer according to claim 4, characterized in that, The inner diameter of the circular yoke (1) is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm; The inner diameter of the semi-circular yoke (1) is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm; The inner diameter of the horseshoe-shaped yoke (1) is 850 mm to 1200 mm, the outer diameter is 1500 mm to 1850 mm, and the height is 1000 mm to 1500 mm.

10. A horizontal magnetic circuit type continuous casting electromagnetic stirrer according to any one of claims 1 to 9, characterized in that, The installation position of the horizontal magnetic circuit type continuous casting electromagnetic stirrer on the continuous casting machine is determined by the equiaxed crystal volume fraction, and the equiaxed crystal volume fraction range is 0.35 to 0.65.

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