A special-shaped iron-core type high-energy continuous casting traveling wave linear electromagnetic stirrer

Abstract

The present invention relates to the technical field of continuous casting electromagnetic stirrers, and specifically discloses a special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer, which includes a yoke, a special-shaped iron core, and an induction coil. The yoke is of a cylindrical structure; a plurality of special-shaped iron cores are welded to the inner side of the yoke. The special-shaped iron cores are arranged in layers along the axis direction of the yoke, and each layer of special-shaped iron cores is evenly distributed along the circumference of the yoke. A core ring is sleeved on the special-shaped iron core; the induction coil is horizontally wound between adjacent layers of special-shaped iron cores. Thus, it can improve the utilization efficiency of the electromagnetic field, reduce the heat generation of the electromagnetic stirrer, increase the electromagnetic density of the working surface, improve 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.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous casting electromagnetic stirrers, and particularly to a special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer. Background Art

[0002] During the solidification process of molten metal, electromagnetic stirring technology mainly uses the electromagnetic force generated by an electromagnetic stirrer to strengthen the convection, heat transfer, and mass transfer of high-temperature molten steel in a billet, thereby achieving a technical means to improve the internal quality of the continuous casting billet. Electromagnetic stirring technology has been widely used in continuous casting industrial production because of its stable performance, high metal yield, significant improvement in the quality of continuous casting billets, and irreplaceable role in increasing the equiaxed crystal ratio and reducing center segregation.

[0003] Since the winding form of the continuous casting traveling wave linear electromagnetic stirrer is different from that of the rotary electromagnetic stirrer, the corresponding magnetic field distribution is also different. Usually, the quality of the stirring effect and the metallurgical effect of the billet depends to a large extent on the magnetic field distribution generated by the stirrer and the strength of the electromagnetic force. The traveling wave linear electromagnetic stirrer drives the melt in the liquid cavity of the billet to perform forced convection through the longitudinal electromagnetic force, improves the melt flow, heat transfer, and mass transfer conditions during the solidification process of the billet, refines the grains, increases the equiaxed crystal ratio, reduces the center shrinkage and segregation, reduces inclusions and pores, thereby achieving the purpose of improving the quality of the billet. However, the current continuous casting traveling wave linear electromagnetic stirrer still has the following deficiencies:

[0004] (1) Since the magnetic circuit of the current traveling wave linear electromagnetic stirrer is an open circuit, the volume of the air domain between the stirrer and the billet is large, and the magnetic leakage rate is large. Coupled with the fact that the resistance of molten steel is also relatively large at high temperatures, the electromagnetic induction and the corresponding electromagnetic force generated in the billet decay rapidly. Generally, when in use, it is necessary to reduce the frequency and increase the current intensity, resulting in waste of electric power resources.

[0005] (2) Since the electromagnetic field utilization efficiency of the current traveling wave linear electromagnetic stirrer is relatively low, the strength of the electromagnetic force is greatly reduced. Therefore, the number of turns of the coil and the volume of the coil are usually increased, which results in a relatively large volume of the continuous casting traveling wave linear electromagnetic stirrer, making it inconvenient to install and use on a continuous casting machine.

[0006] (3) Since the current traveling wave linear electromagnetic stirrer has a large volume, a large magnetic leakage rate, and a large amount of heat generated by the coil, usually to make the traveling wave linear electromagnetic stirrer operate normally, it is necessary to increase the cooling water volume of the coil, resulting in waste of water resources. At the same time, it will also reduce the service life of the electromagnetic stirrer coil and the electrical equipment of the load.

[0007] Therefore, the current traveling-wave linear electromagnetic stirrers for continuous casting are generally installed in areas with high liquid fraction and low solid fraction, such as the mold and the secondary cooling zone of the continuous caster. However, in the terminal solidification zone, due to high molten steel viscosity, high static pressure, and high solid fraction, the traveling-wave linear electromagnetic stirrer cannot achieve good stirring effect, so the improvement of the internal quality of the billet is not satisfactory.

[0008] Chinese Patent CN117282316A discloses an inclined yoke type traveling-wave electromagnetic stirrer and its usage method. The yoke and winding structure of this type of stirrer are complex and large in volume. Therefore, the practical application of this type of electromagnetic stirrer in continuous casting production is inconvenient, and the auxiliary system equipment such as electrical and water cooling matching this type of electromagnetic stirrer has special structures, making installation and maintenance inconvenient. Chinese Patent CN105935752A discloses a vertical electromagnetic stirring method for controlling the center quality of billets. The overall direction of the electromagnetic force generated in the billet is parallel to the billet center line direction, strengthening the mixing of the upper high-temperature melt zone and the lower low-temperature melt zone in the center area of the billet, improving the feeding ability of the upper melt to the lower melt during solidification in the center area of the billet, and promoting the uniformity of temperature and solute distribution inside the billet. However, this patent does not give the design parameters of specific electromagnetic device structures such as the iron core, coil, and winding of the electromagnetic stirrer. Chinese Patent CN101700477A discloses a multi-mode magnetic field electromagnetic stirrer. The structure of this stirrer is composed of a composite of a rotating magnetic field and a traveling-wave linear magnetic field. However, the magnetic field structure of this type of electromagnetic stirrer is complex, and the interference between the rotating magnetic field and the traveling-wave magnetic field is large, resulting in low effective utilization rates of both the rotating magnetic field and the traveling-wave magnetic field. Summary of the Invention

[0009] In view of this, the present invention provides a special-shaped iron core type high-energy continuous casting traveling-wave linear electromagnetic stirrer, which can improve the electromagnetic field utilization efficiency, reduce the heat generation of the electromagnetic stirrer, increase the electromagnetic density of the working surface, and improve 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.

[0010] An embodiment of the present invention provides a special-shaped iron core type high-energy continuous casting traveling-wave linear electromagnetic stirrer, including a yoke, special-shaped iron cores, and induction coils. The yoke is of a cylindrical structure; a plurality of special-shaped iron cores are welded to the inner side of the yoke. The special-shaped iron cores are arranged in layers along the axis direction of the yoke, and each layer of special-shaped iron cores is evenly distributed along the circumference of the yoke. A core ring is sleeved on the special-shaped iron cores; the induction coils are horizontally wound between adjacent layers of special-shaped iron cores.

[0011] Furthermore, the cross-section of the special-shaped iron core is a truncated rectangular shape, and the core ring is a right-angled square core ring; wherein, the direction of the truncated surface of the truncated rectangular shape and the opening direction of the right-angled core ring are consistent with the traveling direction of the electromagnetic field of the electromagnetic stirrer.

[0012] Furthermore, the cross-section of the special-shaped iron core is convex-shaped, and the iron core ring is a right-angled iron core ring; wherein, the protruding surface direction of the convex shape and the opening direction of the right-angled iron core ring are consistent with the advancing direction of the electromagnetic field of the electromagnetic stirrer.

[0013] Furthermore, the cross-section of the special-shaped iron core is trapezoidal, and the iron core ring is a right-angled iron core ring; wherein, the upper base direction of the trapezoid and the opening direction of the right-angled iron core ring are consistent with the advancing direction of the electromagnetic field of the electromagnetic stirrer.

[0014] Furthermore, the cross-section of the special-shaped iron core is a semi-circle with a protrusion, and the iron core ring is a C-shaped iron core ring; wherein, the protruding surface direction of the semi-circle and the opening direction of the C-shaped iron core ring are consistent with the advancing direction of the electromagnetic field of the electromagnetic stirrer.

[0015] Furthermore, the bottom thickness of the right-angled iron core ring is 1.2 to 2 times the side thickness.

[0016] Furthermore, the thickness of the C-shaped iron core ring gradually decreases from the middle to both ends where the notch is formed.

[0017] Furthermore, there is a gapless fit between the special-shaped iron core and the iron core ring; or there is a clearance fit of 1 to 10 mm between the special-shaped iron core and the iron core ring.

[0018] Furthermore, the height of the yoke is 800 mm to 1500 mm; the inner diameter of the yoke is 1.5 times the equivalent diameter of the cross-section of the casting blank.

[0019] Furthermore, the number of induction coils is 1 to 12, and the number of turns of each induction coil is 88 to 120; the inner diameter of the induction coil is 1.2 times the equivalent diameter of the cross-section of the casting blank.

[0020] The beneficial effects of the technical solution provided by the embodiment of the present invention at least include: a special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer, including a yoke and windings, the yoke is a cylindrical structure; multiple groups of windings are located inside the yoke, and the windings are evenly arranged along the axis direction of the yoke; wherein, the windings include special-shaped iron cores, iron core rings and induction coils, multiple special-shaped iron cores are evenly arranged along the circumferential direction of the yoke, the special-shaped iron cores are welded to the yoke, the iron core rings are sleeved on the special-shaped iron cores, and the induction coils are horizontally wound above the special-shaped iron cores. Thus, it can improve the use efficiency of the electromagnetic field, reduce the heat generation of the electromagnetic stirrer, increase the electromagnetic density of the working surface, improve the stirring force intensity on the molten metal, thereby expanding the equiaxed crystal zone of the casting blank, reducing segregation, and improving the internal quality of the casting blank.

[0021] Among them, the special-shaped iron core provided by the present invention can be in the shape of a rectangular with a missing corner, a convex shape, a trapezoid, or a semi-circular shape with a protrusion in its cross-section. The special-shaped iron core can play a strengthening role in the electromagnetic induction phenomenon, enabling the electromagnetic field generated by electromagnetic induction inside the electromagnetic stirrer to better cover and penetrate the solid phase of the continuous casting billet, effectively acting on the molten steel inside, thereby minimizing the risk of breakout.

[0022] On the other hand, due to the enhancement of the electromagnetic induction phenomenon, the electromagnetic stirrer can appropriately reduce its volume, reducing resource waste. Moreover, the electromagnetic stirrer provided by the present invention can prevent the traveling wave magnetic field from leaking in the non-working direction to the greatest extent, improving the energy use efficiency and the energy efficiency ratio.

[0023] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specifically illustrates the specific implementation manners of this application. Brief Description of the Drawings

[0024] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. Among them:

[0025] Figure 1 shows a schematic structural diagram of an electromagnetic stirrer with a special-shaped iron core having a rectangular cross-section with a missing corner according to the first embodiment of the present invention;

[0026] Figure 2 shows Figure 1 a schematic cross-sectional view of the electromagnetic stirrer with a special-shaped iron core having a rectangular cross-section with a missing corner of the illustrated embodiment;

[0027] Figure 3 shows a schematic structural diagram of an electromagnetic stirrer with a special-shaped iron core having a convex-shaped cross-section according to the second embodiment of the present invention;

[0028] Figure 4 shows Figure 3 a schematic cross-sectional view of the electromagnetic stirrer with a special-shaped iron core having a convex-shaped cross-section of the illustrated embodiment;

[0029] Figure 5 shows a schematic structural diagram of an electromagnetic stirrer with a special-shaped iron core having a trapezoidal cross-section according to the third embodiment of the present invention;

[0030] Figure 6 shows Figure 5 a schematic cross-sectional view of the electromagnetic stirrer with a special-shaped iron core having a trapezoidal cross-section of the illustrated embodiment;

[0031] Figure 7 Shows the structural schematic diagram of an electromagnetic stirrer with a special-shaped iron core having a semi-circular cross-section provided by the fourth embodiment of the present invention;

[0032] Figure 8 Shows Figure 7 The cross-sectional schematic diagram of the electromagnetic stirrer with a special-shaped iron core having a semi-circular cross-section of the shown embodiment;

[0033] Figure 9 Shows the cross-sectional schematic diagram of a special-shaped iron core with a missing-corner rectangular cross-section provided by the first embodiment of the present invention;

[0034] Figure 10 Shows the cross-sectional schematic diagram of a special-shaped iron core with a convex-shaped cross-section provided by the second embodiment of the present invention;

[0035] Figure 11 Shows the cross-sectional schematic diagram of a special-shaped iron core with a trapezoidal cross-section provided by the third embodiment of the present invention;

[0036] Figure 12 Shows the cross-sectional schematic diagram of a special-shaped iron core with a semi-circular cross-section provided by the fourth embodiment of the present invention;

[0037] Figure 13 Shows the cross-sectional schematic diagram of a right-angled iron core ring provided by the embodiment of the present invention;

[0038] Figure 14 Shows the cross-sectional schematic diagram of a C-shaped iron core ring provided by the embodiment of the present invention;

[0039] Figure 15 Shows the assembly schematic diagram of a special-shaped iron core with a missing-corner rectangular cross-section and a right-angled iron core ring provided by the first embodiment of the present invention;

[0040] Figure 16 Shows the assembly schematic diagram of a special-shaped iron core with a convex-shaped cross-section and a right-angled iron core ring provided by the second embodiment of the present invention;

[0041] Figure 17 Shows the assembly schematic diagram of a special-shaped iron core with a trapezoidal cross-section and a right-angled iron core ring provided by the third embodiment of the present invention;

[0042] Figure 18 Shows the assembly schematic diagram of a special-shaped iron core with a semi-circular cross-section and a C-shaped iron core ring provided by the fourth embodiment of the present invention;

[0043] Figure 19 Shows the magnetic pole distribution schematic diagram of a special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer provided by the embodiment of the present invention;

[0044] Figure 20 Shows the numerical simulation vector diagram of the magnetic induction intensity of the special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer provided by the embodiment of the present invention;

[0045] Figure 21 Shows the numerical simulation vector diagram of the electromagnetic force of the special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer provided by the embodiment of the present invention;

[0046] Figure 22 Shows the numerical comparison diagram of the magnetic induction intensity of the special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer provided by the embodiment of the present invention and the conventional electromagnetic stirrer along the diameter direction of the induction coil.

[0047] Among them, Figures 1 to 22 The corresponding relationship between the reference numerals and the component names in the figure is:

[0048] 1 yoke, 2 special-shaped iron core, 3 induction coil, 4 right-angled iron core ring, 5 C-shaped iron core ring. Specific embodiments

[0049] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0050] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0051] The following refers to Figures 1 to 22 Describe a special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer according to some embodiments of the present invention.

[0052] As Figures 1 to 8 shown, a special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer according to an embodiment of the present invention includes a yoke 1, a special-shaped iron core 2 and an induction coil 3. The yoke 1 is of a cylindrical structure; a plurality of special-shaped iron cores 2 are welded to the inner side of the yoke 1. The special-shaped iron cores 2 are arranged in layers along the axis direction of the yoke 1, and each layer of special-shaped iron cores 2 is evenly distributed along the circumference of the yoke 1. A core ring is sleeved on the special-shaped iron core 2; the induction coil 3 is horizontally wound between adjacent layers of special-shaped iron cores 2. Thus, the use efficiency of the electromagnetic field can be improved, the heat generation of the electromagnetic stirrer can be reduced, the electromagnetic density of the working surface can be increased, the stirring force intensity on the molten metal can be improved, thereby expanding the equiaxed crystal zone of the slab, reducing segregation, and improving the internal quality of the slab.

[0053] Specifically, the high-energy continuous casting traveling wave linear electromagnetic stirrer is placed along the billet drawing direction, the induction coil 3 is arranged perpendicular to the billet, and the electromagnetic stirrer is installed at a position where the solid fraction of the billet center is greater than 0.3. The induction coil 3 is connected to three-phase alternating current of U, V, and W, so that a traveling wave magnetic field that moves up and down along the billet drawing direction is generated in the induction coil 3, covering the entire solidification end region, and an electromagnetic force opposite to the billet drawing direction is generated. The electromagnetic force excites an alternating electromagnetic field, which gradually penetrates into the molten steel in the billet, causing an induced current to be generated in the molten steel due to the electromagnetic induction phenomenon. The induced current interacts with the local magnetic field to generate an electromagnetic force, thereby driving the molten steel to move to achieve the effect of stirring the molten steel.

[0054] It can be understood that changing the current phase sequence can generate an electromagnetic force in the same direction as the billet drawing direction. That is to say, the high-energy continuous casting traveling wave linear electromagnetic stirrer has two working modes: a. Stirring against the direction of molten steel flow; b. Stirring along the direction of molten steel flow. The working mode can be changed by changing the current phase sequence through the PLC controller.

[0055] Among them, the special-shaped iron core 2 can play a strengthening role in the electromagnetic induction phenomenon, enabling the electromagnetic field generated by electromagnetic induction inside the electromagnetic stirrer to better cover and penetrate the solid phase of the billet, effectively acting on the internal molten steel, thereby minimizing the risk of breakout. On the other hand, due to the strengthening of the electromagnetic induction phenomenon, the volume of the electromagnetic stirrer can be appropriately reduced (the intensity of the electromagnetic field generated by the electromagnetic stirrer is positively correlated with the volume of the electromagnetic stirrer). Compared with the conventional electromagnetic stirrer, the special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer provided by the present invention can reduce the volume by 10% without reducing the working efficiency, reducing resource waste.

[0056] Among them, the rated current of the three-phase alternating current is 1200 A (that is, during the use of the electromagnetic stirrer, the current of the three-phase alternating current does not exceed 1200 A), the voltage is 380 to 480 V, the frequency is 0.5 to 10 Hz, and the phase angles are -120°, 0°, and 120°.

[0057] Among them, the materials of the yoke 1, the special-shaped iron core 2, the iron core ring, and the induction coil 3 are metal materials for generating and transmitting the electromagnetic field; the specific materials of the yoke 1, the special-shaped iron core 2, the iron core ring, and the induction coil 3 are not limited here. For example, the yoke 1, the special-shaped iron core 2, and the iron core ring can be stainless steel or copper, and the induction coil 3 can be made of round or flat copper wires.

[0058] As Figure 9 、 Figure 13 and Figure 15 shown, in some possible embodiments, the cross-section of the special-shaped iron core 2 is a rectangular shape with a missing corner, and the iron core ring is a right-angled square iron core ring; among them, the direction of the missing corner surface of the rectangular shape with a missing corner and the opening direction of the right-angled iron core ring 4 are consistent with the traveling direction of the electromagnetic field of the electromagnetic stirrer.

[0059] As Figure 10 , Figure 13 and Figure 16 shown, in some possible embodiments, the cross-section of the special-shaped iron core 2 is convex-shaped, and the iron core ring is a right-angle iron core ring 4; wherein, the protruding surface direction of the convex shape and the opening direction of the right-angle iron core ring 4 are consistent with the advancing direction of the electromagnetic field of the electromagnetic stirrer.

[0060] As Figure 11 , Figure 13 and Figure 17 shown, in some possible embodiments, the cross-section of the special-shaped iron core 2 is trapezoidal, and the iron core ring is a right-angle iron core ring 4; wherein, the upper base direction of the trapezoid and the opening direction of the right-angle iron core ring 4 are consistent with the advancing direction of the electromagnetic field of the electromagnetic stirrer.

[0061] It can be understood that the type of the trapezoid of the cross-section of the special-shaped iron core 2 is not limited here, and it can be an isosceles trapezoid, a right trapezoid or a common trapezoid, as long as the upper base direction of the trapezoid is consistent with the advancing direction of the electromagnetic field of the electromagnetic stirrer.

[0062] As Figure 12 , Figure 14 and Figure 18 shown, in some possible embodiments, the cross-section of the special-shaped iron core 2 is a semi-circle with a protrusion, and the iron core ring is a C-shaped iron core ring 5; wherein, the protruding surface direction of the semi-circle and the opening direction of the C-shaped iron core ring 5 are consistent with the advancing direction of the electromagnetic field of the electromagnetic stirrer.

[0063] As Figure 13 shown, the bottom thickness of the right-angle iron core ring 4 is 1.2 to 2 times the side thickness.

[0064] As Figure 14 shown, the cross-section of the C-shaped iron core ring 5 is a symmetrically tapered shape, and the thickness of the C-shaped iron core ring 5 gradually decreases from the middle to both ends forming the notch.

[0065] As Figures 15 to 18 shown, when the special-shaped iron core 2 is assembled to the iron core ring, the special-shaped iron core 2 and the iron core ring can be in a clearance-free fit or a clearance fit; when the special-shaped iron core 2 is assembled to the iron core ring with a clearance fit, the clearance between the special-shaped iron core 2 and the iron core ring is 1 to 10 mm.

[0066] As Figures 1 to 8 shown, the height of the yoke 1 is 800 mm to 1500 mm, and the inner diameter of the yoke 1 is 1.5 times the equivalent diameter of the cross-section of the continuous casting billet.

[0067] As Figures 1 to 8As shown, the number of induction coils 3 is 1 to 12, the number of turns of each induction coil 3 is 88 to 120, and the inner diameter of the induction coil 3 is 1.2 times the equivalent diameter of the cross-section of the continuous casting billet.

[0068] Example 1 - A high-energy continuous casting traveling wave linear electromagnetic stirrer provided with a special-shaped iron core 2 with a convex-shaped cross-section:

[0069] As Figure 19 shown, the high-energy continuous casting traveling wave linear electromagnetic stirrer is arranged horizontally. The high-energy continuous casting traveling wave linear electromagnetic stirrer consists of a cylindrical yoke 1, 52 special-shaped iron cores 2 with a convex-shaped cross-section, and 12 induction coils 3. The convex-shaped special-shaped iron core 2 is divided into 13 layers, with 4 in each layer. A right-angled iron core ring 4 is sleeved outside the convex-shaped special-shaped iron core 2. Among them, the height of the yoke 1 is 1200 mm, the inner diameter is 1150 mm, and the outer diameter is 1340 mm; the inner diameter of the induction coil 3 is 1100 mm, and the outer diameter is 1130 mm. When the induction coil 3 is connected to three-phase alternating current, multiple induction coils 3 respectively form N poles and S poles, and multiple induction coils 3 forming N poles and multiple induction coils 3 forming S poles are integrally distributed along the axis direction of the yoke 1.

[0070] As Figures 20 to 21 shown, use the three-phase power supply of the PLC controller to connect the induction coil 3 to three-phase alternating current of U, V, and W. The current of the three-phase alternating current is 1200 A, the frequency is 0.5 Hz, the phase angles are -120°, 0°, and 120°, so that the induction coil 3 generates a traveling wave magnetic field that moves up and down along the billet drawing direction, covering the entire solidification end region, generating an electromagnetic force opposite to the billet drawing direction, and the maximum magnetic induction intensity value at the center is 1335 Gs.

[0071] Example 2 - A high-energy continuous casting traveling wave linear electromagnetic stirrer provided with a special-shaped iron core 2 with a truncated rectangular cross-section:

[0072] The high-energy continuous casting traveling wave linear electromagnetic stirrer is arranged horizontally. The high-energy continuous casting traveling wave linear electromagnetic stirrer consists of a cylindrical yoke 1, 52 special-shaped iron cores 2 with a truncated rectangular cross-section, and 12 induction coils 3. The truncated rectangular special-shaped iron core 2 is divided into 13 layers, with 4 in each layer. A right-angled iron core ring 4 is sleeved outside the truncated rectangular special-shaped iron core 2. Among them, the height of the yoke 1 is 1200 mm, the inner diameter is 1150 mm, and the outer diameter is 1340 mm; the inner diameter of the induction coil 3 is 1100 mm, and the outer diameter is 1130 mm.

[0073] The induction coil 3 is connected to three-phase alternating current of U, V, and W by using a three-phase power supply of a PLC controller. The current of the three-phase alternating current is 1200 A, the frequency is 0.5 Hz, and the phase angles are -120°, 0°, and 120°, so that a traveling magnetic field that moves up and down in the casting direction is generated in the induction coil 3, covering the entire solidification end region, generating an electromagnetic force opposite to the casting direction, and the maximum magnetic induction intensity value at the center is 1469 Gs.

[0074] Example 3 - A high-energy continuous casting traveling wave linear electromagnetic stirrer provided with a special-shaped iron core 2 with a trapezoidal cross-section:

[0075] The high-energy continuous casting traveling wave linear electromagnetic stirrer is arranged horizontally. The high-energy continuous casting traveling wave linear electromagnetic stirrer consists of a yoke 1 with a cylindrical structure, 52 special-shaped iron cores 2 with a trapezoidal cross-section, and 12 induction coils 3. The trapezoidal special-shaped iron cores 2 are divided into 13 layers, with 4 in each layer, and a right-angled iron core ring 4 is sleeved outside the trapezoidal special-shaped iron cores 2. Among them, the height of the yoke 1 is 1200 mm, the inner diameter is 1150 mm, and the outer diameter is 1340 mm; the inner diameter of the induction coil 3 is 1100 mm and the outer diameter is 1130 mm.

[0076] The induction coil 3 is connected to three-phase alternating current of U, V, and W by using a three-phase power supply of a PLC controller. The current of the three-phase alternating current is 1200 A, the frequency is 0.5 Hz, and the phase angles are -120°, 0°, and 120°, so that a traveling magnetic field that moves up and down in the casting direction is generated in the induction coil 3, covering the entire solidification end region, generating an electromagnetic force opposite to the casting direction, and the maximum magnetic induction intensity value at the center is 1535 Gs.

[0077] Example 4 - A high-energy continuous casting traveling wave linear electromagnetic stirrer provided with a special-shaped iron core 2 with a semi-circular cross-section with a protrusion:

[0078] The high-energy continuous casting traveling wave linear electromagnetic stirrer is arranged horizontally. The high-energy continuous casting traveling wave linear electromagnetic stirrer consists of a yoke 1 with a cylindrical structure, 52 special-shaped iron cores 2 with a semi-circular cross-section, and 12 induction coils 3. The semi-circular special-shaped iron cores 2 are divided into 13 layers, with 4 in each layer, and a C-shaped iron core ring 5 is sleeved outside the semi-circular special-shaped iron cores 2. Among them, the height of the yoke 1 is 1200 mm, the inner diameter is 1150 mm, and the outer diameter is 1340 mm; the inner diameter of the induction coil 3 is 1100 mm and the outer diameter is 1130 mm.

[0079] Connect the induction coil 3 to the three-phase alternating current of U, V, and W phases using a three-phase power supply with a PLC controller. The current of the three-phase alternating current is 1200 A, the frequency is 0.5 Hz, and the phase angles are -120°, 0°, and 120°, so that a traveling magnetic field that moves up and down along the casting direction is generated in the induction coil 3, covering the entire solidification end region, generating an electromagnetic force opposite to the casting direction, and the maximum magnetic induction intensity value at the center is 1289 Gs.

[0080] As Figure 22 shown, by comparing the magnetic induction intensities at the center along the diameter direction of the induction coil 3 between the conventional electromagnetic stirrer and the special-shaped iron-core high-energy continuous casting traveling-wave linear electromagnetic stirrer provided by the present invention, it is obtained that the magnetic induction intensity of the high-energy continuous casting traveling-wave linear electromagnetic stirrer is increased by an average of 300 Gs compared with that of the conventional electromagnetic stirrer. That is to say, the high-energy continuous casting traveling-wave linear electromagnetic stirrer provided by the present invention can prevent the leakage of the traveling magnetic field in the non-working direction to the greatest extent, increase the magnetic field density of the working surface by 30%, and improve the energy use efficiency and energy efficiency ratio.

[0081] As shown in Table 1, by comparing the magnetic induction intensities at the center along the diameter direction of the induction coil 3 between the conventional electromagnetic stirrer under different currents and the special-shaped iron-core high-energy continuous casting traveling-wave linear electromagnetic stirrer of different embodiments provided by the present invention, it is obtained that the magnetic induction intensity of the high-energy continuous casting traveling-wave linear electromagnetic stirrer is increased by an average of 300 Gs compared with that of the conventional electromagnetic stirrer.

[0082] Table 1 Comparison of the magnetic induction intensities generated at the center of the high-energy continuous casting traveling-wave linear electromagnetic stirrer and the conventional electromagnetic stirrer under different currents

[0083]

[0084]

[0085] Therefore, the high-energy continuous casting traveling-wave linear electromagnetic stirrer provided with the special-shaped iron core 2 of the present invention can improve the use efficiency of the electromagnetic field, reduce the heat generation of the electromagnetic stirrer, increase the electromagnetic density of the working surface, increase the stirring force intensity on the molten metal, thereby expanding the equiaxed crystal zone of the billet, reducing segregation, improving the internal quality of the billet, providing more sufficient freedom for the operation during continuous casting, being beneficial to optimizing the continuous casting production process, and improving the internal quality of the continuous casting billet.

[0086] In the description of the present invention, the term "a plurality of" means two or more. Unless otherwise clearly defined, the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship in the drawings. This 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 on the present invention; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. 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.

[0087] In the description of the present invention, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0088] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer, characterized in that: include: A magnetic yoke (1), wherein the magnetic yoke (1) is a cylindrical structure; A special-shaped iron core (2), wherein a plurality of the special-shaped iron cores (2) are welded to the inner side of the magnetic yoke (1), the special-shaped iron cores (2) are arranged in layers along the axial direction of the magnetic yoke (1), each layer of the special-shaped iron cores (2) is evenly distributed along the circumference of the magnetic yoke (1), and the special-shaped iron cores (2) are sleeved with iron core rings; An induction coil (3), wherein the induction coil (3) is horizontally wound between two adjacent layers of the special-shaped iron cores (2); The cross section of the special-shaped iron core is a rectangular shape with missing corners, a convex shape, a trapezoidal shape or a shape with a convex semicircle; Wherein, when the cross section of the special-shaped iron core is a rectangular shape with missing corners, a convex shape or a trapezoid, the iron core ring is set as a right-angle iron core ring (4); Wherein, when the cross section of the special-shaped iron core is a semicircular shape with a protrusion, the iron core ring is set as a C-shaped iron core ring (5); Wherein, when the cross section of the special-shaped iron core is a corner-less rectangle, the direction of the corner-less surface of the corner-less rectangle and the opening direction of the right-angle iron core ring (4) are consistent with the direction of travel of the electromagnetic field of the electromagnetic stirrer; Wherein, when the cross section of the special-shaped iron core is a convex shape, the direction of the convex surface of the convex shape and the opening direction of the right-angle iron core ring (4) are consistent with the direction of travel of the electromagnetic field of the electromagnetic stirrer; Wherein, when the cross section of the special-shaped iron core is a trapezoid, the upper bottom direction of the trapezoid and the opening direction of the right-angle iron core ring (4) are consistent with the direction of travel of the electromagnetic field of the electromagnetic stirrer; When the cross section of the special-shaped iron core is a semicircle with a protrusion, the direction of the protruding surface of the semicircle and the opening direction of the C-shaped iron core ring (5) are consistent with the direction of travel of the electromagnetic field of the electromagnetic stirrer.

2. The special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer according to claim 1, characterized in that: The bottom thickness of the right-angle iron core ring (4) is 1.2 to 2 times the thickness of the side edge.

3. The special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer according to claim 2 is characterized in that: The thickness of the C-shaped iron core ring (5) gradually decreases from the middle to the two ends where the notch is formed.

4. The special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer according to claim 1, characterized in that: The special-shaped iron core (2) and the iron core ring are matched without clearance; or The special-shaped iron core (2) and the iron core ring are matched with a clearance of 1 to 10 mm.

5. The special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer according to claim 1, characterized in that: The height of the yoke (1) is 800 mm to 1500 mm; The inner diameter of the yoke (1) is 1.5 times the equivalent diameter of the cross section of the casting billet.

6. The special-shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer according to claim 1, characterized in that: The number of the induction coils (3) is 1 to 12, and the number of turns of each of the induction coils (3) is 88 to 120 turns; The inner diameter of the induction coil (3) is 1.2 times the equivalent diameter of the cross section of the casting billet.

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