Horizontal magnetic circuit type continuous casting electromagnetic stirrer

Abstract

The invention provides a horizontal magnetic circuit type continuous casting electromagnetic stirrer which comprises a plurality of horizontal magnetic circuit assemblies arranged in the axial direction of a magnet yoke, and each horizontal magnetic circuit assembly comprises a coil wound on an iron core, a first horizontal magnetic circuit and a second horizontal magnetic circuit; the first relay is connected with three wires of the coil through first three-phase power; the second relay is connected with the other three wires of the coil through a second three-phase power supply; and the first horizontal magnetic circuit or the second horizontal magnetic circuit is connected with an upper computer. Based on the design of a horizontal magnetic circuit, larger effective electromagnetic force can be generated, so that the use efficiency of an electromagnetic field can be improved, and the heating value of the electromagnetic stirrer is reduced; and meanwhile, the coverage of the generated stirring force is wider, the electromagnetic density of the working face is further increased, the stirring force strength to molten metal is improved, and therefore the isometric crystal area of the casting blank is enlarged, the segregation degree is reduced, and the internal quality of the casting blank is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of metallurgical continuous casting electromagnetic agitators, and specifically relates to a horizontal magnetic circuit continuous casting electromagnetic agitator. Background Art

[0002] Electromagnetic metallurgy technology uses the thermal effect and force effect of electromagnetic field to control the energy transmission and fluid flow in the metallurgical process, so as to optimize the metallurgical process, improve product quality, and improve production efficiency and performance. Research has found that the electromagnetic fluid mechanics phenomenon generated by the joint action of magnetic field and electric field on liquid metal has been applied to metallurgical production, forming a series of electromagnetic metallurgical technologies such as electromagnetic braking, electromagnetic stirring and electromagnetic soft contact, which are called material electromagnetic process. Among them, electromagnetic stirring technology has become the most critical technology in the continuous casting process because of its irreplaceable role in stabilizing continuous casting operation, improving metal recovery rate, improving the quality of continuous casting billets, increasing equiaxed crystal rate and reducing center segregation.

[0003] During the continuous casting process, the basic principle of electromagnetic stirring to improve the internal quality of continuous casting billets is that the electromagnetic stirrer with alternating current stimulates the generation of alternating electromagnetic fields that gradually penetrate into the molten steel in the billet, and the electromagnetic induction and the current-carrying conductor interact with the magnetic field, thereby generating an induced current in the molten steel. The induced current interacts with the local magnetic field to generate electromagnetic force, thereby promoting the movement of the molten steel and uniformizing the temperature field and solute field. This improves the cleanliness of the steel, expands the equiaxed crystal area of ​​the billet, reduces channel segregation, reduces or eliminates central porosity and central shrinkage, and greatly improves the internal quality of the billet.

[0004] At present, electromagnetic stirrers are divided into two types: continuous casting electromagnetic stirrers based on rotating magnetic circuit design and continuous casting electromagnetic stirrers based on traveling wave magnetic circuit design. The rotating magnetic circuit is a closed magnetic circuit that passes three-phase electricity with a phase angle of 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, which cannot promote the longitudinal flow of the molten steel along the billet drawing direction. Therefore, the tangential electromagnetic force has a limited range of action and cannot act on the molten steel in the entire billet, which easily causes the formation of "white bright band" internal defects in the billet. The traveling wave magnetic circuit is an open circuit that passes two-phase electricity with a phase angle of 90°. The continuous casting electromagnetic stirrer designed based on the traveling wave magnetic circuit can generate electromagnetic force along the direction of billet drawing. However, due to the small phase angle of the traveling wave magnetic circuit, the insufficient phase angle leads to discontinuous magnetic pole switching and abnormal superposition of magnetic field intensity in some areas. It is necessary to increase the winding density or the core volume to compensate for the magnetic field intensity. In addition, the coil of the traveling wave electromagnetic stirrer generates a lot of heat during use, and a large amount of cooling water is required to cool the coil. Therefore, the continuous casting electromagnetic stirrer designed with the traveling wave magnetic circuit is large in size, low in useful power, high in energy consumption, and serious waste of water resources.

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

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

[0007] In order to solve the above problems, the present application provides a horizontal magnetic circuit type continuous casting electromagnetic stirrer, comprising a plurality of groups of horizontal magnetic circuit components arranged along the axial direction of a magnetic yoke, wherein the horizontal magnetic circuit components comprise a coil wound on an iron core, wherein the coil comprises six strands of electric wire; A first horizontal magnetic circuit, the first horizontal magnetic circuit comprises a first relay and a first three-phase electricity, one end of the first relay is connected to the first three-phase electricity, and three wires of the coil are correspondingly connected to the other end of the first relay; A second horizontal magnetic circuit, the second horizontal magnetic circuit comprises a second relay and a second three-phase electricity, one end of the second relay is connected to the second three-phase electricity, and the other three wires of the coil 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, 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 path in the first horizontal magnetic circuit and the second horizontal magnetic circuit is opposite.

[0008] Optionally, the first horizontal magnetic circuit further includes a first diode, and the second horizontal magnetic circuit further includes a second diode, and the first diode and the second diode are used to absorb the reverse electromotive force generated when the coil is powered off.

[0009] Optionally, the coil is a solenoid winding wound around the iron core.

[0010] Optionally, the cross-sectional shape of the yoke is circular, semicircular or horseshoe-shaped.

[0011] Optionally, at least two groups of horizontal magnetic circuit components are arranged on the circular magnetic yoke.

[0012] Optionally, at least one set of horizontal magnetic circuit components is disposed on the semicircular magnetic yoke.

[0013] Optionally, the horseshoe-shaped magnetic yoke includes a semicircular magnetic yoke and a reinforced magnetic circuit plate, and two ends of the semicircular magnetic yoke are respectively connected to the reinforced magnetic circuit plates.

[0014] Optionally, at least three groups of horizontal magnetic circuit components are arranged on the horseshoe-shaped magnetic yoke.

[0015] 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; The inner diameter of the semicircular magnetic yoke is 850mm~1200mm, the outer diameter is 1500mm~1850mm, and the height is 1000mm~1500mm; The inner diameter of the horseshoe-shaped magnetic 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.

[0016] Optionally, the installation position of the horizontal magnetic circuit continuous casting electromagnetic stirrer on the continuous casting machine is determined by an equiaxed crystal volume fraction, wherein the equiaxed crystal volume fraction ranges from 0.35 to 0.65.

[0017] By means of the above technical solution, the present invention has at least the following beneficial effects: An embodiment of the present application provides a horizontal magnetic circuit continuous casting electromagnetic stirrer, which connects three wires of the coil to the first three-phase electricity of the first horizontal magnetic circuit, and the other three wires to the second three-phase electricity of the second horizontal magnetic circuit, so that the coil is passed through three-phase electricity with a phase angle of 120°, so that the current directions in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite and are located in the same horizontal plane, thereby generating an electromagnetic force parallel to the billet drawing direction, thereby increasing the range of action of the electromagnetic force, so that it can act on the molten steel in the entire billet, avoiding the formation of "white bright band" internal defects of the billet, and improving the degree of segregation 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.

[0018] The embodiment of the present application provides a horizontal magnetic circuit continuous casting electromagnetic stirrer. Based on the design of the horizontal magnetic circuit, it can generate a larger effective electromagnetic force, thereby improving the efficiency of the use of the electromagnetic field, reducing the heat generated by the coil of the electromagnetic stirrer, and avoiding the waste of cooling water resources; at the same time, the stirring force generated by the electromagnetic stirrer with a horizontal magnetic circuit design is an electromagnetic force along the billet drawing direction, which can promote the longitudinal flow of molten steel inside the billet, and the stirring force has a wider coverage area, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a magnetic circuit wiring diagram of a horizontal magnetic circuit continuous casting electromagnetic stirrer according to an embodiment of the present application; Figure 2 The electromagnetic stirrer with a circular yoke based on a horizontal magnetic circuit design according to an embodiment of the present application; Figure 3 The electromagnetic stirrer with a semicircular yoke based on a horizontal magnetic circuit design according to an embodiment of the present application; Figure 4The electromagnetic stirrer with a horseshoe-shaped yoke based on a horizontal magnetic circuit design according to an embodiment of the present application; Figure 5 The electromagnetic field distribution generated by the electromagnetic stirrer with a circular yoke based on the horizontal magnetic circuit design according to the embodiment of the present application on the round blank; 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; Figure 7 The electromagnetic force distribution of 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 in the diameter direction of the round billet of the embodiment of the present application; Figure 8 This is a streamline diagram of the interior of the solidified liquid core of a round billet under the action of an electromagnetic stirrer having a circular yoke designed based on a horizontal magnetic circuit in an embodiment of the present application.

[0020] The reference numerals are as follows: 1. Magnetic yoke; 2. Iron core; 3. Coil; 4. Strengthening magnetic circuit plate; A1, first relay; B1, second relay; P1, first diode; P2, second diode. DETAILED DESCRIPTION

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0023] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0025] See also 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, comprising a plurality of groups of horizontal magnetic circuit components arranged along the axial direction of a magnetic yoke 1, wherein the horizontal magnetic circuit components comprise a coil 3 wound on an iron core 2, wherein the coil 3 comprises six strands of electric wire; A first horizontal magnetic circuit, the first horizontal magnetic circuit comprises a first relay A1 and a first three-phase electricity, one end of the first relay is connected to the first three-phase electricity, and three wires of the coil 3 are correspondingly connected to the other end of the first relay; A second horizontal magnetic circuit, the second horizontal magnetic circuit comprises a second relay B1 and a second three-phase electricity, one end of the second relay is connected to the second three-phase electricity, and the other three wires 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, 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 path in the first horizontal magnetic circuit and the second horizontal magnetic circuit is opposite.

[0026] By connecting three wires of the coil to the first three-phase electricity of the first horizontal magnetic circuit, and connecting the other three wires to the second three-phase electricity of the second horizontal magnetic circuit, so that the coil is energized with three-phase electricity with a phase angle of 120°, the current directions in the first horizontal magnetic circuit and the second horizontal magnetic circuit are opposite and are located in the same horizontal plane, which can generate an electromagnetic force parallel to the billet drawing direction, thereby increasing the action range of the electromagnetic force, so that it can act on the molten steel in the entire billet, avoiding the formation of "white bright band" internal defects of the billet, and 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 horizontal magnetic circuit, a greater effective electromagnetic force can be generated. Therefore, the utilization 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 horizontal magnetic circuit design is an electromagnetic force along the billet drawing direction. This electromagnetic force can promote the longitudinal flow of molten steel inside the ingot, and the stirring force has a wider coverage area, 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 ingot, reducing segregation, and improving the internal quality of the ingot.

[0027] Among them, Figure 1 A, B, and C represent the input terminals of the three-phase electricity. The phase angles of the first three-phase electricity and the second three-phase electricity are both 120°, and the three phase angles of the three-phase electricity differ by 120°, so that at any time, the vector sum of the voltage and current of the three phases is zero. This means that the power of the three phases can complement each other, thereby achieving a more stable power output.

[0028] Figure 1 In the electromagnetic stirrer coil based on the horizontal magnetic circuit design, a set of coils consists of six wires, three of which are connected to the first horizontal magnetic circuit (i.e. Figure 1 The remaining three wires are connected to the second horizontal magnetic circuit (i.e. Figure 1 The purpose of this wiring is that the jumper resistors between the three phases can transfer useless work between the two phases, thus causing three-phase electrical imbalance. This useless work is generally caused by factors such as grid instability or grid cable loss. In this way, the current flowing into the magnetic circuit is stable.

[0029] Among them, three wires of the 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, so the magnetic fields generated are also in opposite directions and in the same horizontal plane.

[0030] 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.

[0031] Wherein, 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.

[0032] That is to say, through the FI magnetic circuit control node in the upper computer, the flow path of the current 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 on the same horizontal plane, so the magnetic fields generated are also in opposite directions and on the same horizontal plane.

[0033] Specifically, the host computer is composed of a multi-pole multi-stage PID algorithm controller, which uses modbus or tcp / dtu transmission protocol and DAQ data storage unit for data storage. These modules work in coordination with each other to perform complex automated electromagnetic circuit tasks.

[0034] 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 reverse electromotive force generated when the coil 3 is powered off.

[0035] There are two first diodes P1 in the first horizontal magnetic circuit and two second diodes P2 in the second horizontal magnetic circuit, which are used to absorb the reverse electromotive force generated when the coil 3 is powered off to protect the components in the circuit.

[0036] The coil 3 is a solenoid winding wound around the iron core 2 .

[0037] Among them, the wires in the solenoid winding are flat wires.

[0038] The cross-sectional shape of the yoke 1 is circular, semicircular, or horseshoe-shaped.

[0039] The magnetic field distribution of the circular cross-section yoke is more uniform, 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, can withstand high mechanical stress, and is suitable for high power density electromagnetic equipment.

[0040] The semicircular cross-section yoke is suitable for use in space-constrained environments and can better adapt to specific installation locations. The magnetic field distribution of the semicircular yoke has a certain directionality, and the magnetic lines of force usually diverge or concentrate along the tangent direction of the semicircle, which is suitable for occasions that require a specific magnetic field distribution.

[0041] 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 exhibits a stronger attraction when adsorbing metal objects, making it suitable for picking up metal objects.

[0042] Furthermore, the iron core 2 is made of 12CrNi3A steel, and the iron core 2 and the yoke 1 are welded together.

[0043] At least two groups of horizontal magnetic circuit components are arranged on the circular magnetic yoke 1 .

[0044] Wherein, at least two groups of horizontal magnetic circuit components are arranged on the circular magnetic yoke 1, such as Figure 1 As shown, there are two groups of horizontal magnetic circuit components, and the two groups of horizontal magnetic circuit components are arranged opposite to each other. They can generate mutually superimposed magnetic fields, thereby significantly enhancing the magnetic field strength; the two groups of horizontal magnetic circuit components arranged opposite to each other can achieve more efficient energy transmission. By optimizing the coupling degree of the coil 3 in the horizontal magnetic circuit component, energy loss can be reduced and transmission efficiency can be improved.

[0045] Specifically, each group of horizontal magnetic circuit components has three iron cores 2 with coils 3 arranged at equal intervals vertically.

[0046] Figure 5 The electromagnetic field distribution generated by the electromagnetic stirrer with a circular yoke based on the horizontal magnetic circuit design of the embodiment of the present application on the round billet; the electromagnetic stirrer with a circular yoke based on the horizontal magnetic circuit design is established by the Ansys Maxwell numerical simulation method, and the magnetic induction intensity distribution of the electromagnetic stirrer on the round billet is obtained. It can be seen that the magnetic field intensity generated by the electromagnetic stirrer that can effectively act on the round billet has a wider coverage and higher intensity.

[0047] Figure 6 The stirring force distribution of the electromagnetic stirrer with a circular yoke based on the horizontal magnetic circuit design of the embodiment of the present application on the round billet is shown; the stirring force of the electromagnetic stirrer on the round billet is obtained by the Ansys Maxwell numerical simulation method based on the electromagnetic stirrer with a circular yoke based on the horizontal magnetic circuit design. It can be seen that the stirring force generated by the electromagnetic stirrer that can effectively act on the round billet has a wider coverage and higher strength. And the direction of the stirring force is the electromagnetic force along the direction of the billet drawing.

[0048] At least one set of horizontal magnetic circuit components is arranged on the semicircular magnetic yoke 1 .

[0049] Among them, Figure 3 As shown, in this embodiment, a group of horizontal magnetic circuit components are arranged on the semicircular magnetic yoke 1.

[0050] Specifically, the horizontal magnetic circuit assembly has three iron cores 2 with coils 3 arranged at equal intervals vertically.

[0051] like Figure 4 As shown, the horseshoe-shaped magnetic yoke 1 comprises a semicircular magnetic yoke and a reinforcing magnetic circuit plate 4, and the two ends of the semicircular magnetic yoke are respectively connected with the reinforcing magnetic circuit plates 4.

[0052] By connecting the reinforcing magnetic circuit plates 4 at the two ends of the semicircular magnetic yoke, the magnetic field distribution is optimized and the leakage magnetic flux is reduced, while the magnetic circuit efficiency is improved and the energy loss is reduced.

[0053] At least three groups of horizontal magnetic circuit components are arranged on the horseshoe-shaped magnetic yoke 1.

[0054] Among them, in this embodiment, one group of horizontal magnetic circuit components is arranged on the inner side of the semicircular magnetic yoke; the two outer groups of horizontal magnetic circuit components are arranged on the reinforced magnetic circuit plate 4, that is, one group of horizontal magnetic circuit components is correspondingly arranged on a reinforced magnetic circuit plate 4.

[0055] Specifically, the horizontal magnetic circuit assembly has three iron cores 2 with coils 3 arranged at equal intervals vertically.

[0056] The inner diameter of the circular magnetic 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 semicircular 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; the thickness of the reinforced magnetic circuit plate 4 is 300 mm to 500 mm, and the height is 1000 mm to 1500 mm.

[0057] Table 1 Comparison of magnetic induction intensity at the center of electromagnetic stirrers with different magnetic circuit designs at different currents

[0058] By comparing the central magnetic induction intensities of the rotating magnetic circuit, traveling wave magnetic circuit and horizontal magnetic circuit under different currents, it is found that the magnetic induction intensity of the horizontal magnetic circuit electromagnetic stirrer is 150Gs higher than that of the rotating magnetic circuit on average, and the magnetic induction intensity of the horizontal magnetic circuit electromagnetic stirrer is 300Gs higher than that of the traveling wave magnetic circuit on average.

[0059] Figure 7The electromagnetic force distribution of the horizontal magnetic circuit continuous casting electromagnetic stirrer, the rotating magnetic circuit electromagnetic stirrer and the traveling wave magnetic circuit electromagnetic stirrer in the embodiment of the present application is in the diameter direction of the round billet; the electromagnetic stirrer (circular, semicircular and horseshoe-shaped) constructed based on the horizontal magnetic circuit type can generate a greater effective electromagnetic force, and this horizontal magnetic circuit electromagnetic stirrer is more efficient and saves energy.

[0060] 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, wherein the equiaxed crystal volume fraction ranges from 0.35 to 0.65.

[0061] Figure 8 This is a streamline diagram of the solidified liquid core of a round billet under the action of an electromagnetic stirrer with a circular yoke based on a horizontal magnetic circuit design according to an embodiment of the present application; 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, wherein the equiaxed crystal volume fraction ranges from 0.35 to 0.65. Under the action of an electromagnetic stirrer with a circular yoke based on a horizontal magnetic circuit design, the liquid core inside the round billet presents two longitudinal circulation flow patterns (the left side is a counterclockwise circulation flow, and the right side is a clockwise circulation flow pattern). This circulation pattern promotes the mutual mixing between the high-temperature, low-solute melt in the upper part of the liquid core and the low-temperature, high-solute melt in the lower liquid core and the solidification front, thereby improving the uniformity of the temperature and solute distribution in the liquid core and improving the internal quality of the billet.

[0062] Based on the application of horizontal magnetic circuit continuous casting electromagnetic stirrer on continuous casting machine, such as the end size of square billet: 160mm×160mm, 200mm×240mm, 240mm×240mm, 280mm×360mm, 280mm×380mm and 325mm×380mm. The cross-sectional size of round billet: Φ350mm, Φ450mm, Φ500mm, Φ550mm, Φ650mm and Φ800mm.

[0063] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0064] The above are only 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 principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles 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 continuous casting electromagnetic stirrer, characterized in that: It comprises a plurality of groups of horizontal magnetic circuit components arranged along the axial direction of a magnetic yoke (1), the horizontal magnetic circuit components comprising a coil (3) wound on an iron core (2), a first horizontal magnetic circuit and a second horizontal magnetic circuit, the coil (3) comprising six strands of electric wire; The first horizontal magnetic circuit comprises a first relay (A1) and a first three-phase electricity, one end of the first relay is connected to the first three-phase electricity, and three wires of the coil (3) are correspondingly connected to the other end of the first relay; The second horizontal magnetic circuit comprises a second relay (B1) and a second three-phase electricity, one end of the second relay is connected to the second three-phase electricity, and the other three wires 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, 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 path in the first horizontal magnetic circuit and the second horizontal magnetic circuit is opposite.

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

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

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

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

6. A horizontal magnetic circuit continuous casting electromagnetic stirrer according to claim 4, characterized in that: At least one set of horizontal magnetic circuit components is arranged on the semicircular magnetic yoke (1).

7. A horizontal magnetic circuit continuous casting electromagnetic stirrer according to claim 4, characterized in that: The horseshoe-shaped magnetic yoke (1) comprises a semicircular magnetic yoke and a reinforced magnetic circuit plate (4), and the two ends of the semicircular magnetic yoke are respectively connected to the reinforced magnetic circuit plates (4).

8. A horizontal magnetic circuit continuous casting electromagnetic stirrer according to claim 7, characterized in that: At least three groups of horizontal magnetic circuit components are arranged on the horseshoe-shaped magnetic yoke (1).

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

10. A horizontal magnetic circuit 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, wherein the equiaxed crystal volume fraction ranges from 0.35 to 0.65.

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