Electromagnetic stirring device

Abstract

The present application relates to the technical field of casting billet continuous casting, and provides an electromagnetic stirring device, which comprises an inductor with a magnetic field guiding tooth array and a magnetic conducting roller group; the traveling wave magnetic field generated by the inductor with the magnetic field guiding tooth array is transmitted to the magnetic conducting body in the magnetic conducting roller through the magnetic field guiding tooth array, and then the magnetic field is applied to the casting billet; the magnetic circuit channel has small magnetic resistance, and the magnetic field has high efficiency; the inductor with the magnetic field guiding tooth array is installed outside the roller body, so that the space is large, and a high-power inductor can be installed; the magnetic field output by the inductor with the magnetic field guiding tooth array has a large action area, so that the stirring force can be obtained by the steel melt in a larger area of the liquid core of the casting billet, so as to meet the needs of the continuous casting process, and the technical problem of insufficient stirring force of the electromagnetic stirring equipment in the related art when the large-size casting billet is produced through the continuous casting process is solved.

Description

Technical Field

[0001] This invention relates to the technical field of the metallurgical industry, specifically to an electromagnetic stirring device. Background Technology

[0002] Continuous casting technology has been widely applied in the metallurgical industry. Implementing electromagnetic stirring during continuous casting production can effectively improve the internal structure of the billet, reduce central porosity, eliminate central shrinkage cavities and cracks, increase the equiaxed grain ratio, and also improve the surface quality of the billet. The basic components of an electromagnetic stirring device are a frequency converter and an inductor. Based on the installation position and form of the inductor, electromagnetic stirring devices in the secondary cooling zone of continuous casting can be divided into three basic types: box-type, embedded, and roller-type.

[0003] The sensor of a box-type electromagnetic stirrer is installed behind the support rollers in the secondary cooling zone. The space occupied by the sensor is relatively large, allowing for the installation of high-power sensors, and the equipment has high reliability. However, its disadvantage is that the support rollers separate the sensor from the billet, resulting in a relatively large distance between the sensor and the billet, high magnetic resistance, and reduced sensor efficiency. To achieve the electromagnetic stirring force required for continuous casting, the output power of the electromagnetic stirrer must be increased. Typical box-type electromagnetic stirrers often have power exceeding 1000 kVA. The large power consumption coupled with insufficient electromagnetic stirring force is the biggest drawback of the box-type electromagnetic stirrer.

[0004] The embedded electromagnetic stirring device embeds its inductor poles between two support rollers, bringing the inductor poles closer to the billet and overcoming the disadvantage of being too far from the billet. This significantly improves the inductor's efficiency and greatly reduces the required electromagnetic power for the same process effect. However, it requires replacing the billet support rollers with small-diameter, non-magnetic rollers. The space between the two small-diameter rollers is used to accommodate the inductor poles. The small-diameter rollers lack sufficient support force and may not adequately support the billet, potentially causing bulging or bending deformation of the support rollers, thus affecting the normal operation of continuous casting production.

[0005] The roller body of the roller-type electromagnetic stirring device is a non-magnetic alloy steel tube. The inductor is installed inside the steel tube, which has the same outer diameter as a regular support roller, making installation convenient. The distance between the magnetic pole of the inductor and the slab is only the thickness of the steel tube, resulting in a short distance and high magnetic field efficiency. Its disadvantages include: the relatively small space within the steel tube limits the stirring force it can provide; the inductor operates under high voltage and high current conditions, and the coil is constantly immersed in water and subjected to the impact of cooling water inside the steel tube, which can easily cause insulation damage; furthermore, the steel tube roller body has a thinner wall, resulting in less support force and weaker resistance to deformation compared to a regular solid support roller. Although auxiliary supports can be added outside the roller body, its inherent drawbacks remain: short service life and limited output power due to long-term operation in harsh environments with high temperature, high humidity, and high loads. Summary of the Invention

[0006] To overcome the above-mentioned defects, embodiments of the present invention provide an electromagnetic stirring device, which solves the technical problem of insufficient stirring force of electromagnetic stirring equipment when producing large-size billets through continuous casting process in related technologies.

[0007] According to one aspect, at least one embodiment of the present invention provides an electromagnetic stirring apparatus, comprising:

[0008] The sensor includes a plurality of magnetic field guiding teeth, which are arranged in an array and divided into at least two columns, with a receiving space formed between two adjacent columns of magnetic field guiding teeth.

[0009] A magnetic roller assembly is disposed within the receiving space. The magnetic roller assembly is used to be positioned on one side of the movement path of the casting billet to guide the magnetic field generated by the sensor to the casting billet. The magnetic roller assembly includes at least one roller body and a magnetic conductor disposed within the roller body. The magnetic conductor is located at the center of two adjacent rows of magnetic field guiding teeth and abuts against the inner wall of the roller body. The magnetic conductor is made of a magnetically conductive material.

[0010] For example, in an electromagnetic stirring device provided in at least one embodiment of the present invention, the sensor further includes:

[0011] An induction core is provided on the side of the magnetic roller assembly away from the casting billet. The induction core includes a number of protrusions, which are spaced apart along the extension direction of the induction core. The magnetic field guiding teeth are provided on the protrusions.

[0012] A coil, the coil being wound on the induction core and located between two adjacent salient poles;

[0013] A heat insulation element is disposed at the end of the magnetic field guiding tooth near the roller body.

[0014] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, the accommodating space is a U-shaped trough, the width of the accommodating space is greater than the diameter of the roller, the arc surface at the bottom of the accommodating space is concentric with the roller, the distance from the center of the bottom arc of the U-shaped trough to the top of the magnetic field guiding tooth is less than the radius of the roller, and the shape of the U-shaped trough can also be other shapes with openings.

[0015] For example, in an electromagnetic stirring device provided in at least one embodiment of the present invention, an isolation component is further included. The isolation component is disposed in the roller body. The isolation component includes a non-magnetic body. The non-magnetic body is located between two adjacent magnetic bodies and its end abuts against the two adjacent magnetic bodies. The sidewall of the non-magnetic body abuts against the inner wall of the roller body. The non-magnetic body is made of non-magnetic alloy steel material.

[0016] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, both the magnetic conductor and the non-magnetic conductor are provided with cooling water holes, which are used to allow cooling water to pass through.

[0017] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, the roller body includes a roller sleeve and shaft heads disposed at both ends of the roller sleeve. The magnetic roller assembly and the isolation assembly are both located inside the roller sleeve. The end face of the shaft head near the roller sleeve abuts against the magnetic material and / or the non-magnetic material. The shaft head is used to support the roller sleeve. The shaft head and the roller sleeve are made of non-magnetic alloy steel.

[0018] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, the length of the magnetic conductor is greater than or equal to the width of the magnetic field guiding teeth.

[0019] For example, in at least one embodiment of the electromagnetic stirring device provided by the present invention, the device further includes:

[0020] An isolation sleeve is disposed inside the cooling water hole;

[0021] A rotary joint is provided at the end of the isolation sleeve, and the end of the rotary joint away from the isolation sleeve is used to connect to an external water source.

[0022] For example, in an electromagnetic stirring device provided in at least one embodiment of the present invention, the inner walls of the magnetic conductor and the cooling water hole are provided with guide grooves, and the outer wall of the isolation sleeve is provided with guide strips that cooperate with the guide grooves.

[0023] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, a relief groove is provided on the outer wall of the magnetic conductor and the non-magnetic conductor. The relief groove extends in a straight line and passes through the axial direction of the roller body. The roller body also includes a filler strip, which is inserted into the relief groove. A positioning hole is provided at the end of the shaft head near the end of the roller body, and the end of the filler strip is inserted into the positioning hole.

[0024] The beneficial effects of this invention are as follows:

[0025] The sensor of this invention is installed behind the magnetic roller assembly, on the side of the magnetic roller assembly furthest from the billet. This provides ample space for installing a high-power sensor, enabling the provision of a powerful traveling-wave magnetic field that fully meets the requirements of the continuous casting process. The traveling-wave magnetic field generated by the sensor acts on the billet through the magnetic field guiding tooth array and the magnetic roller assembly within it. This results in a short magnetic path, low magnetic resistance, high magnetic field efficiency, and a large effective area, allowing the billet to obtain a greater electromagnetic stirring force. Therefore, the billet can obtain a powerful stirring force that fully meets the requirements of the continuous casting process, which is of great significance for producing extra-thick billets such as ship plates and offshore platform plates.

[0026] Depending on the requirements, the magnetic roller assembly can consist of one or more rollers. Multiple rollers can be combined with a high-power inductor, resulting in a large magnetic field area and strong stirring ability. This can drive the liquid core inside the billet to flow over a large area, achieving better process results.

[0027] The working environment of the support rollers and magnetic rollers in continuous casting is harsh. The sensor described in this invention is installed behind the magnetic roller group, which reduces the impact of extreme high temperature and high humidity environment on the sensor and extends the sensor life. The magnetic roller group can not only realize the magnetic function, but also has similar mechanical strength to conventional support rollers through the support of the roller body by the magnetic conductor. Its life is basically the same as that of conventional support rollers, which can save maintenance funds for the steel industry.

[0028] Furthermore, this invention can flexibly design the effective area and stirring force of the inductor magnetic field according to the needs of the continuous casting process, so as to achieve a more perfect combination of electromagnetic stirring technology and continuous casting technology, thereby helping to further improve the quality and production efficiency of continuous casting products. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an electromagnetic stirring device supporting a casting in one embodiment of the present invention;

[0031] Figure 2 for Figure 1 A schematic diagram of the electromagnetic stirring device in the embodiment;

[0032] Figure 3 This is a schematic diagram of a single roller body in another embodiment of the present invention;

[0033] Figure 4 for Figure 1A schematic diagram of the internal structure of the roller in the embodiment;

[0034] Figure 5 for Figure 1 A schematic diagram of the distribution structure of the magnetic conductor and the sub-magnetic conductor in the embodiment;

[0035] Figure 6 for Figure 1 A schematic diagram of the structure of the magnetic conductor in the embodiment;

[0036] Figure 7 for Figure 1 A partial structural diagram of the roller body in the embodiment;

[0037] Figure 8 for Figure 7 Enlarged structural diagram at point A in the diagram;

[0038] Figure 9 This is a schematic diagram of the internal structure of the roller from another angle.

[0039] Figure 10 for Figure 9 Enlarged structural diagram at point B in the diagram;

[0040] Figure 11 for Figure 4 Enlarged structural diagram at point C;

[0041] Figure 12 This is a schematic diagram of the sensor structure.

[0042] In the diagram: 110, Roller body; 200, Cast billet; 300, Sensor; 310, Magnetic field guide teeth; 311, Accommodation space; 400, Magnetic roller assembly; 410, Magnetic conductor; 500, Isolation assembly; 510, Non-magnetic conductor; 420, Cooling water hole; 111, Roller sleeve; 112, Shaft head; 320, Iron core; 330, Coil; 340, Heat insulation component; 600, Isolation sleeve; 700, Rotary joint; 430, Guide groove; 610, Guide bar; 440, Relief groove; 113, Filler bar; 1121, Positioning hole. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0044] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0045] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0048] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0049] like Figure 1The diagram illustrates an electromagnetic stirring device according to an embodiment of the present invention. This device is installed in the secondary cooling zone of a continuous casting production line. In the secondary cooling zone, the surface of the billet 200 crystallizes and solidifies to form a shell, while the interior of the shell remains hot molten steel. Within the secondary cooling zone, the billet 200 gradually undergoes internal crystallization and solidification during transport until the center is completely solidified. The billet 200 is typically transported via support rollers. During transport, the electromagnetic force generated by the electromagnetic stirring device acts on the interior of the billet 200, reducing shrinkage cavities and cracks. To improve the efficiency of electromagnetic stirring, obtain a stronger magnetic field, and simultaneously meet the support requirements during the billet 200 transport process, the electromagnetic stirring device proposed in this embodiment includes an inductor 300 and a magnetic roller assembly 400. The casting billet 200 and the sensor 300 are located on both sides of the magnetic roller assembly 400. The sensor 300 includes a number of magnetic field guiding teeth 310, which are arranged in an array and divided into at least two rows. An accommodating space 311 is formed between two adjacent rows of magnetic field guiding teeth 310. The magnetic roller assembly 400 is disposed in the accommodating space 311. The magnetic roller assembly 400 includes at least one roller body 110 and a magnetic conductor 410 disposed in the roller body 110. The magnetic conductor 410 abuts against the inner wall of the roller body 110. The magnetic field guiding teeth 310 of the sensor 300 cover the outer peripheral wall of the roller body 110, and the magnetic conductor 410 is located inside the roller body 110 corresponding to the position of the magnetic field guiding teeth 310. The roller body 110 is made of heat-resistant non-magnetic alloy steel, and the magnetic conductor 410 is made of high-temperature resistant magnetic material. The magnetic field generated by the inductor 300 is guided to the billet 200 through the magnetic roller group 400. After the inductor 300 is energized with alternating current, a traveling wave magnetic field is formed. The magnetic field acts on the unsolidified liquid core in the billet 200 through the array of magnetic field guide teeth 310 and the magnetic roller group 400, pushing the liquid core to flow and realizing the stirring of the molten steel in the billet 200. The magnetic circuit is short, the magnetic resistance is small, and the magnetic field efficiency is high. The inductor 300 is installed behind the magnetic roller assembly 400, on the side furthest from the billet 200. This larger installation space allows for the installation of a high-power inductor 300. The magnetic conductor 410 and the magnetic field guide teeth 310 provide a low-resistance path for the magnetic field generated by the inductor 300, significantly improving the efficiency of the magnetic field. The magnetic roller assembly 400 can have multiple rollers 110, which, in conjunction with the high-power inductor 300, increase the area of ​​the magnetic field, allowing a larger area of ​​molten steel to receive electromagnetic stirring force, providing a stronger technical means for optimizing the continuous casting process. Therefore, the number of rollers 110 is not limited here; one roller 110 can correspond to one inductor 300, i.e., as shown below. Figure 3 The structure shown is as follows. The magnetic roller assembly 400 may also include two or more roller bodies 110, with the multiple roller bodies 110 arranged in parallel and spaced apart, i.e., as shown... Figure 1 and Figure 2The structure shown. The number of rollers 110 and the center distance between two adjacent rollers 110 need to be determined according to the needs of the continuous casting process. The more rollers 110 there are and the larger the center distance, the larger the area of ​​the magnetic field generated by the inductor 300, thus giving more molten steel in the billet liquid core a stirring force. On the other hand, an increase in the number of rollers 110 also means an increase in the area occupied by the inductor 300, which may exceed the range allowed by the continuous casting machine. Therefore, the area of ​​the magnetic field and the installation position of the inductor 300 that the continuous casting machine can provide need to be comprehensively balanced.

[0050] Along the axial extension direction of the roller body 110, the sensor 300 has a plurality of spaced magnetic field guide teeth 310, and the space between two adjacent rows of magnetic field guide teeth 310 can be as follows: Figure 12 The U-shaped groove shown has a bottom arc diameter that is 10 to 50 mm larger than the diameter of the roller 110. The distance from the center of the bottom arc of the U-shaped groove to the top of the magnetic field guide tooth 310 is 10 to 50 mm smaller than the radius of the roller 110. A typical roller 110 has a diameter between 100 and 300 mm, meaning the bottom arc diameter of the U-shaped groove is increased by 10 to 50 mm, while the distance from the center of the bottom arc of the U-shaped groove to the top of the magnetic field guide tooth 310 is decreased by 10 to 50 mm. The bottom of the U-shaped groove can be concentric with the roller 110, thus reducing the risk of impact between the roller 110 and the U-shaped groove even if axial runout occurs during roller 110 rotation. The bottom of the U-shaped groove can also be any shape other than an arc. The accommodating space 311 can also be any other opening shape, as long as it can be set around the outer peripheral wall of the roller 110 without affecting the rotation of the roller 110. The roller 110 can rotate around its own axis to support the casting billet 200. The electromagnetic stirring device is placed on one side of the moving path of the billet 200. When the thickness of the billet 200 is relatively thick, electromagnetic stirring devices can also be set on both sides of the billet 200. It should be noted that the billet 200 and the sensor 300 should be located on both sides of the roller body 110, so as to isolate the heat of the billet 200 through the roller body 110 and extend the service life of the sensor 300.

[0051] like Figure 2 As shown, the sensor 300 is positioned on the side of the roller 110 away from the billet 200. The magnetic field guiding teeth 310 of the sensor 300 are spaced apart along the axial direction of the roller 110 on the side of the induction core 320 facing the roller 110. The roller 110 is located between two adjacent rows of magnetic field guiding teeth 310. The sensor 300 is mounted on the side of the roller 110 away from the billet 200, providing a relatively large mounting space for a high-power sensor 300. The roller 110, the magnetic conductor 410, and the array of magnetic field guiding teeth 310 provide a low magnetic resistance path for the magnetic field generated by the sensor 300, significantly improving the efficiency of the magnetic field.

[0052] See further Figure 3and Figure 4 The number of magnetic conductors 410 is consistent with the number of magnetic field guide teeth 310 in each row, and they are arranged in a one-to-one correspondence. Each magnetic conductor 410 is located at the center of two adjacent magnetic field guide teeth 310 in corresponding rows. The outer peripheral wall of the magnetic conductor 410 is in close contact with the inner wall of the roller 110. When the roller 110 is subjected to radial pressure from the billet 200, the pressure is transmitted to the magnetic conductor 410 through the inner wall of the roller 110, and the magnetic conductor 410 provides radial support to the roller 110. Preferably, the magnetic conductor 410 and the roller 110 are arranged concentrically to facilitate the installation of the magnetic conductor 410. The magnetic conductor 410 is made of a high-temperature resistant magnetic material, such as an iron-cobalt alloy or an iron-based alloy with added elements such as chromium and silicon.

[0053] During operation, the roller 110 rotates around its own axis under the action of an external drive device. When the billet 200 is conveyed, an alternating current is passed through the coil 330 of the inductor 300 to generate an alternating magnetic field. This alternating magnetic field is conducted through the induction core 320 to each magnetic field guide tooth 310. The magnetic field guide teeth 310 guide the magnetic field to the magnetic conductor 410 inside the roller 110. Since the magnetic conductor 410 is located at the center of the magnetic field guide teeth 310, the magnetic field is mainly transmitted through the magnetic conductor 410 when passing through the wall of the roller 110, and then acts on the interior of the billet 200. The alternating magnetic field acts on the unsolidified molten steel inside the billet 200, causing it to generate an induced current. This induced current is subjected to electromagnetic force in the magnetic field, driving the molten steel to flow and thus agitating the molten steel inside the billet 200.

[0054] In this embodiment, the roller 110, in conjunction with the magnetic conductor 410, guides the magnetic field while providing stable support for the billet 200. The magnetic field guiding teeth 310 of the inductor 300 are spaced apart along the axial direction of the roller 110 and arranged around the outer peripheral wall of the roller 110 away from the billet 200, shortening the distance between the magnetic field source and the billet 200 and reducing magnetic field divergence loss. The magnetic conductor 410 is located at the center of the magnetic field guiding teeth 310, enabling directional guidance of the magnetic field generated by the guiding teeth 310. This allows the magnetic field to penetrate the roller 110 wall more concentratedly and enter the billet 200, reducing magnetic field loss in the non-magnetic parts of the roller 110, improving magnetic field utilization efficiency, and thus enhancing the stirring force on the molten steel inside the billet 200. Meanwhile, the magnetic conductor 410 abuts against the inner wall of the roller 110, and can bear the radial force when the roller 110 is subjected to the pressure of the billet 200, ensuring the structural strength of the roller 110 and avoiding the weakening of the support capacity of the roller 110 due to the setting of the magnetic field guiding structure. It solves the problems of large magnetic resistance of existing box-type stirring devices, insufficient support force of embedded stirring devices, and limited power of roller-type stirring devices. This electromagnetic stirring device can provide sufficient stirring force for large-size billets 200 to eliminate central shrinkage cavities and cracks and increase equiaxed crystal ratio, and can also ensure stable support for billets 200, meeting the process requirements of continuous casting production.

[0055] Furthermore, refer to Figure 4 The electromagnetic stirring device also includes an isolation component 500. The isolation component 500 is located inside the roller sleeve 111 of the roller body 110. The isolation component 500 is composed of non-magnetic materials 510, made of non-magnetic alloy steel such as stainless steel. The non-magnetic materials 510 of the isolation component 500 are located between two adjacent magnetic materials 410, with their end faces tightly abutting against the end faces of the adjacent magnetic materials 410, and their side walls tightly abutting against the inner wall of the roller sleeve 111, forming a structure in which the magnetic materials 410 and non-magnetic materials 510 are alternately arranged along the axial direction of the roller body 110. The alternating arrangement of the non-magnetic materials 510 and the magnetic materials 410 not only ensures uniform distribution of molten steel inside the billet 200 under the action of electromagnetic force, but also fills the space inside the roller body 110 to ensure the supporting performance of the roller body 110, providing stable support even for large-sized billets 200.

[0056] Reference Figure 5 and Figure 6 In order to ensure that the temperature of the magnetic conductor 410 does not exceed the allowable operating temperature, cooling water holes 420 are provided axially at the center of both the magnetic conductor 410 and the non-magnetic conductor 510. The cooling water holes 420 pass through both ends of the magnetic conductor 410 and the non-magnetic conductor 510 and are connected in sequence to form a passage for cooling water to pass through.

[0057] like Figure 3 As shown, the roller body 110 includes a roller sleeve 111 and a shaft head 112. The shaft head 112 is located at both ends of the roller sleeve 111 and is used to install bearings and bearing seats. The end face of the shaft head 112 near the roller sleeve 111 abuts against the end faces of the magnetic material 410 and the non-magnetic material 510. The shaft head 112 axially positions the magnetic material 410 and the non-magnetic material 510 inside the roller sleeve 111, thereby fitting the roller body 110. The roller sleeve 111 and the shaft head 112 of the roller body 110 are designed separately. The shaft head 112 supports the roller sleeve 111 by abutting against the magnetic material 410 and the non-magnetic material 510. This simplifies the processing difficulty of the roller sleeve 111. At the same time, the axial positioning of the magnetic material 410 and the non-magnetic material 510 by the shaft head 112 ensures the positional stability of the internal components during the rotation of the roller body 110 and avoids the magnetic field guiding effect being affected by relative displacement. The roller sleeve 111 and the shaft head 112 can be connected by welding, forming a rigid structure with better support strength. The roller sleeve 111 is made of heat-resistant, non-magnetic alloy steel, with a thickness of 20 to 30 mm to ensure support strength. The length of the roller sleeve 111 is greater than the width of the cast billet 200, typically greater than 100 to 300 mm.

[0058] During operation, the non-magnetic body 510 separates adjacent magnetic bodies 410, preventing the magnetic field from being directly transmitted between adjacent magnetic bodies 410; cooling water is introduced into the cooling water hole 420, and the water flows axially through the magnetic body 410 and the non-magnetic body 510, carrying away the heat generated by the magnetic field and the heat transfer of the billet 200 during the operation of the roller body 110; the shaft head 112 abuts against the magnetic body 410 and the non-magnetic body 510, restricting its axial displacement, ensuring the relative position stability of the roller sleeve 111 and the internal components, and at the same time bearing part of the radial force, enhancing the overall support strength of the roller body 110.

[0059] In this embodiment, the non-magnetic material 510 of the isolation component 500 is located between adjacent magnetic materials 410. Its non-magnetic properties block the magnetic field path between adjacent magnetic materials 410, preventing short circuits between them and allowing the magnetic field to be more concentrated and guided to the casting billet 200 through the magnetic materials 410. This further improves the efficiency of magnetic field utilization. In conjunction with the magnetic field guide teeth 310 and the magnetic materials 410, it enhances the stirring force. Simultaneously, the non-magnetic material 510 abuts against the inner wall of the roller body 110, forming radial support for the roller sleeve 111 together with the magnetic materials 410. Combined with the axial positioning of the shaft head 112, this improves the overall structural strength of the roller body 110, making it suitable for supporting large-size casting billets 200. The cooling water holes 420 on the magnetic conductor 410 and the non-magnetic conductor 510 provide a flow channel for the cooling medium. By continuously introducing cooling water, the heat inside the roller 110 can be removed in time, avoiding the roller 110 from becoming too hot due to long-term operation, which would affect its mechanical properties or magnetic field stability and extend the service life of the equipment. It also works in conjunction with the roller sleeve 111 and shaft head 112 of the roller 110 to ensure the compatibility of the cooling system with the support structure.

[0060] Reference Figure 1 , Figure 3 The sensor 300 also includes an induction core 320, a coil 330, and a heat insulation component 340. The induction core 320 is located on the side of the roller 110 away from the billet 200, and has several convex protrusions arranged at intervals on it. Magnetic field guide teeth 310 are disposed on the convex protrusions. The coil 330 is wound around the induction core 320 and located between two adjacent convex protrusions. The heat insulation component 340 is disposed at the end of the magnetic field guide teeth 310 near the roller 110 and is fixedly connected to the end of the magnetic field guide teeth 310. The magnetic field guide teeth 310 and the convex protrusions can be an integral structure or a separate structure design. When the magnetic field guide teeth 310 and the convex protrusions are a separate structure, they are connected by a connecting piece, allowing for individual replacement of the magnetic field guide teeth 310 if damaged, reducing the maintenance cost of the electromagnetic stirring device. The coil 330 is wound on the yoke of the induction core 320. The winding form is a Cramer winding, and the number of windings is 3 to 12. It can be connected in a two-phase working mode or a three-phase working mode. The phase angle in the two-phase working mode is 90 degrees, and the phase angle in the three-phase working mode is 120 degrees.

[0061] In this embodiment, when the inductor 300 is working, an alternating current is passed through the coil 330, causing the inductor core 320 to generate an alternating magnetic field. The magnetic field is guided by the magnetic field guide teeth 310 to the magnetic conductor 410 inside the roller body 110. The heat insulation component 340 reduces heat transfer between the roller body 110 and the magnetic field guide teeth 310, thereby reducing the heat transferred from the billet 200 to the inductor core 320 and the coil 330 through the magnetic field guide teeth 310. The inductor core 320 provides a mounting base for the magnetic field guide teeth 310 and the coil 330. The coil 330 is wound on the inductor core 320 to enhance the magnetic field strength. The magnetic field guide teeth 310 and the inductor core 320 are integrally set to ensure the continuity of magnetic field conduction, reduce magnetic field loss at the connection point, and cooperate with the magnetic conductor 410 to further improve the efficiency of magnetic field transmission to the billet 200. The heat insulation component 340 is disposed between the magnetic field guide tooth 310 and the roller body 110. It can block the heat of the roller body 110 from being transferred to the inductor 300, and prevent the coil 330 from aging due to high temperature or the induction iron core 320 from being affected by temperature changes. This ensures the long-term stable operation of the inductor 300. In conjunction with the cooling function of the cooling water hole 420, it blocks heat transfer from different positions and improves the thermal stability of the equipment.

[0062] Furthermore, referring to Figure 4 , Figures 7-11 The electromagnetic stirring device also includes an isolation sleeve 600 and a rotary joint 700. The isolation sleeve 600 is located inside the cooling water hole 420, with its outer wall fitting against the inner wall of the cooling water hole 420. A guide groove 430 is formed on the inner wall of the cooling water hole 420 for the magnetic material 410 and the non-magnetic material 510, extending axially along the cooling water hole 420. A guide strip 610 is provided on the outer wall of the isolation sleeve 600, engaging with the guide groove 430 to restrict relative rotation between the isolation sleeve 600 and the magnetic material 410 and the non-magnetic material 510. The rotary joint 700 is located at both ends of the isolation sleeve 600, with one end fixedly connected to the end of the isolation sleeve 600 and the other end connected to an external water source via a pipeline. When the roller 110 rotates, the fixed end of the rotary joint 700 remains relatively stationary with the external water source, while the rotating end rotates synchronously with the isolation sleeve 600 and the roller 110.

[0063] In this embodiment, the isolation sleeve 600 is disposed within the cooling water hole 420, which prevents the cooling water from directly contacting the magnetic material 410 and the non-magnetic material 510, reducing the scouring and corrosion of the magnetic material 410 and the non-magnetic material 510 by the water flow and extending their service life. At the same time, the isolation sleeve 600 fits snugly against the inner wall of the cooling water hole 420, ensuring the sealing of the water flow channel and preventing water leakage from affecting the operation of the roller 110. The guide groove 430 cooperates with the guide strip 610 to restrict the relative rotation of the isolation sleeve 600 with the magnetic material 410 and the non-magnetic material 510, ensuring that the isolation sleeve 600 rotates synchronously with the roller 110 and avoiding wear of components due to relative friction. The rotary joint 700 realizes a dynamic sealed connection between the isolation sleeve 600 and the external water source, ensuring a continuous supply of cooling water during the rotation of the roller 110, and forming a complete cooling circulation system with the cooling water hole 420, improving the stability and reliability of cooling. Furthermore, the guide groove 430 and guide bar 610 also provide guidance during the assembly of the roller body 110, the magnetic roller group 400, and the isolation assembly 500. During assembly, a shaft head 112 can be first installed at the end of the roller sleeve 111, and the isolation sleeve 600 can be fixed to the shaft head 112. Then, the magnetic material 410 and the non-magnetic material 510 are sequentially inserted into the roller sleeve 111. During the entry of the magnetic material 410 and the non-magnetic material 510 into the roller sleeve 111, the guide bar 610 and guide groove 430 slide together to guide the movement, ensuring concentricity between the magnetic material 410, the non-magnetic material 510, and the roller sleeve 111, and preventing the magnetic material 410 and the non-magnetic material 510 from tilting or colliding during entry into the roller sleeve 111.

[0064] The length of the magnetic conductor 410 extends along the axial direction of the roller body 110, and its length is greater than or equal to the width of the magnetic field guiding tooth 310 along the axial direction of the roller body 110. That is, the projection of the magnetic field guiding tooth 310 on the axial direction of the roller body 110 falls completely within the axial range of the magnetic conductor 410.

[0065] Further reference Figure 3 The length of the magnetic conductor 410 is greater than or equal to the width of the magnetic field guiding tooth 310, which ensures that the magnetic field generated by the magnetic field guiding tooth 310 is completely received by the magnetic conductor 410 in the axial direction. This prevents the magnetic field from diverging to both sides due to insufficient length of the magnetic conductor 410, further reducing magnetic field loss and allowing more magnetic field to enter the billet 200 through the magnetic conductor 410. This works in conjunction with the guiding effect of the magnetic field guiding tooth 310 to enhance the concentration of the magnetic field and improve the stirring effect on the molten steel.

[0066] To reduce the resistance when the magnetic material 410 and the non-magnetic material 510 enter the roller sleeve 111, a relief groove 440 is provided on the outer wall of the magnetic material 410 and the non-magnetic material 510. The relief groove 440 extends in a straight line and passes through the roller body 110 axially, i.e. Figure 5As shown. The roller body 110 also includes a filler strip 113, which is inserted into the relief groove 440, and its outer wall abuts against the inner wall of the roller sleeve 111, i.e. Figure 11 As shown.

[0067] Reference Figure 10 The end of the shaft head 112 near the roller sleeve 111 is provided with a positioning hole 1121, which extends axially along the roller body 110; the two ends of the filler strip 113 are respectively inserted into the positioning holes 1121 of the shaft head 112 on both sides to realize the axial positioning of the filler strip 113.

[0068] In this embodiment, the clearance groove 440 is inserted into the filler strip 113, and the outer wall of the filler strip 113 abuts against the inner wall of the roller sleeve 111. This fills the gap between the magnetic material 410 and the non-magnetic material 510 and the inner wall of the roller sleeve 111, enhances the radial support of the roller sleeve 111, and prevents the roller sleeve 111 from deforming due to excessive local stress. At the same time, the filler strip 113 extends axially and together with the magnetic material 410 and the non-magnetic material 510, forms a full circumferential support for the roller sleeve 111, improving the structural stability of the roller body 110. The end of the filler strip 113 is inserted into the positioning hole 1121 of the shaft head 112. The shaft head 112 forms an axial positioning of the filler strip 113, which prevents the filler strip 113 from axially displacing during the rotation of the roller body 110 and ensures the stability of the fit between the filler strip 113 and the relief groove 440. At the same time, the positioning hole 1121 and the shaft head 112 work together to position the magnetic conductor 410 and the non-magnetic conductor 510, so as to realize the overall positioning of the internal components of the roller body 110, ensure the stability of the internal structure during long-term rotation, and maintain the reliability of the magnetic field guidance and support functions.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An electromagnetic stirring device, characterized in that, include: The sensor (300) includes a plurality of magnetic field guide teeth (310), which are arranged in an array and divided into at least two columns, with a receiving space (311) formed between two adjacent columns of magnetic field guide teeth (310). A magnetic roller assembly (400) is disposed within the receiving space (311). The magnetic roller assembly (400) is used to be disposed on one side of the moving path of the casting (200) to guide the magnetic field generated by the sensor (300) to the casting (200). The magnetic roller assembly (400) includes at least one roller body (110) and a magnetic conductor (410) disposed within the roller body (110). The magnetic conductor (410) is located at the center of two adjacent rows of magnetic field guiding teeth (310) and abuts against the inner wall of the roller body (110). The sensor (300) also includes: An induction core (320) is provided on the side of the magnetic roller group (400) away from the casting billet (200). The induction core includes a number of protrusions, which are distributed at intervals along the extension direction of the induction core (320). The magnetic field guiding teeth (310) are provided on the protrusions. A coil (330) is wound on the induction core (320) and located between two adjacent convex poles; A heat insulation element (340) is disposed at the end of the magnetic field guide tooth (310) near the roller body (110).

2. The electromagnetic stirring device according to claim 1, characterized in that, The accommodating space (311) is a U-shaped groove, the width of the accommodating space is greater than the diameter of the roller (110), and the arc surface at the bottom of the accommodating space (311) is concentric with the roller (110).

3. The electromagnetic stirring device according to claim 1, characterized in that, It also includes an isolation component (500) disposed within the roller body (110). The isolation component (500) includes a non-magnetic body (510), which is located between two adjacent magnetic bodies (410) and its end abuts against the two adjacent magnetic bodies (410). The sidewall of the non-magnetic body (510) abuts against the inner wall of the roller body (110). The non-magnetic body (510) is made of non-magnetic alloy steel.

4. The electromagnetic stirring device according to claim 3, characterized in that, Both the magnetic conductor (410) and the non-magnetic conductor (510) are provided with cooling water holes (420), which are used to allow cooling water to pass through.

5. The electromagnetic stirring device according to claim 3, characterized in that, The roller body (110) includes a roller sleeve (111) and shaft heads (112) located at both ends of the roller sleeve (111). The magnetic conductor (410) and the isolation assembly (500) are both located inside the roller sleeve (111). The end face of the shaft head (112) near the roller sleeve (111) abuts against the magnetic conductor (410) and / or the non-magnetic conductor (510). The shaft head (112) is used to support the roller sleeve (111). Both the roller sleeve (111) and the shaft head (112) are made of non-magnetic alloy steel.

6. The electromagnetic stirring device according to claim 1, characterized in that, The length of the magnetic conductor (410) is greater than or equal to the width of the magnetic field guiding tooth (310), and the magnetic conductor (410) is made of magnetic material.

7. The electromagnetic stirring device according to claim 4, characterized in that, Also includes: An isolation sleeve (600) is disposed inside the cooling water hole (420); Rotary joint (700), the rotary joint (700) is located at the end of the isolation sleeve (600), and the end of the rotary joint (700) away from the isolation sleeve (600) is used to connect to an external water source.

8. The electromagnetic stirring device according to claim 7, characterized in that, The inner walls of the magnetic conductor (410) and the cooling water hole (420) are provided with guide grooves (430), and the outer wall of the isolation sleeve (600) is provided with guide strips (610) that cooperate with the guide grooves (430).

9. An electromagnetic stirring device according to claim 5, characterized in that, The outer walls of the magnetic conductor (410) and the non-magnetic conductor (510) are provided with relief grooves (440), which extend in a straight line and pass through the axial direction of the roller body (110). The roller body (110) also includes a filler strip (113), which is inserted into the relief groove (440). The shaft head (112) near the end of the roller body (110) is provided with a positioning hole (1121), and the end of the filler strip (113) is inserted into the positioning hole (1121).

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