Electromagnetic stirring device

Abstract

The invention relates to the technical field of casting blank continuous casting, and provides an electromagnetic stirring device which comprises a sensor with a magnetic field guide tooth array and a magnetic conductive roller set. A traveling wave magnetic field generated by the inductor with the magnetic field guide tooth array acts on a casting blank through the magnetic field guide tooth array on one hand, and is transmitted to the magnetizer in the magnetic conductive roller through the magnetic field guide tooth array on the other hand, so that the magnetic field acts on the casting blank, the magnetic resistance of a magnetic path channel is small, and the magnetic field efficiency is high; the inductor with the magnetic field guiding tooth array is installed outside the roller body, the space is large, and a high-power inductor can be installed. The action area of a magnetic field output by the inductor with the magnetic field guide tooth array is large, molten steel with a larger area in a casting blank liquid core can obtain stirring force so as to meet the requirement of a continuous casting process, and the technical problem that in the related technology, when a large-size casting blank is produced through the continuous casting process, the stirring force of electromagnetic stirring equipment is insufficient is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical industry, and in particular to an electromagnetic stirring device. Background Art

[0002] Continuous casting technology has been widely adopted in the metallurgical industry. Implementing electromagnetic stirring during the continuous casting process can effectively improve the internal structure of the ingot, reduce central porosity, eliminate central shrinkage and cracks, increase the equiaxed grain ratio, and enhance the surface quality of the ingot. The basic components of an electromagnetic stirring device are a variable frequency power supply and an inductor. Based on the inductor's installation location and form, 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 inductor of a box-type electromagnetic stirring device is installed behind the support rollers in the secondary cooling zone. The space occupied by the inductor is relatively large, allowing for the installation of high-power inductors, and the reliability of the equipment is also high. However, the disadvantage is that the inductor is separated from the ingot by the support rollers, which makes the inductor far away from the ingot and the magnetic resistance large, reducing the efficiency of the inductor. In order to achieve the electromagnetic stirring force required for continuous casting, the output power of the electromagnetic stirrer must be increased. The power of a typical box-type electromagnetic stirrer often exceeds 1000 kVA. The high power consumption and insufficient electromagnetic stirring force provided are the biggest disadvantages of the box-type electromagnetic stirring device.

[0004] The embedded electromagnetic stirring device embeds its inductor magnetic poles between two support rollers, bringing them close to the billet. This overcomes the disadvantage of being far away from the billet, greatly improving the efficiency of the inductor and significantly reducing the required electromagnetic power to achieve the same process results. However, its disadvantage is that the billet support rollers must be replaced with small-diameter non-magnetic support rollers. The space between the two small-diameter support rollers is used to accommodate the inductor magnetic poles. The small-diameter support rollers have insufficient support force and cannot fully support the billet, which may cause the billet to bulge and the support rollers to bend and deform, affecting the normal operation of continuous casting production.

[0005] The roller body of a roller-type electromagnetic stirring device is a non-magnetic alloy steel tube. The inductor is installed inside the tube, which has the same outer diameter as ordinary support rollers, making installation easy. The distance between the magnetic pole of the inductor installed inside the tube and the slab is only the thickness of the tube, which is short and the magnetic field efficiency is high. However, its disadvantages are that the inductor is installed inside the tube, which has a small space, limiting the stirring force it can provide. Moreover, because the inductor operates at high voltage and high current, the inductor coil is immersed in water for a long time and is subjected to the impact of the cooling water inside the tube, which can easily cause insulation damage. Furthermore, the roller body made of steel tube has a thinner tube wall, which has less support force and weaker deformation resistance than ordinary solid support rollers. Although auxiliary supports can be added to the roller body, the long-term operation in the harsh environment of high temperature, high humidity, and high load still has inherent drawbacks such as short service life and limited output power. Summary of the Invention

[0006] To overcome the above-mentioned defects, an embodiment of the present invention provides an electromagnetic stirring device, which solves the technical problem in the related art of insufficient stirring force of the electromagnetic stirring equipment when producing large-sized ingots through a continuous casting process.

[0007] According to one aspect, at least one embodiment of the present invention provides an electromagnetic stirring device, comprising: An inductor, the inductor comprising a plurality of magnetic field guide teeth, the plurality of magnetic field guide teeth being arranged in an array and divided into at least two rows, with an accommodation space formed between the magnetic field guide teeth in two adjacent rows; A magnetic roller group is arranged in the accommodating space, and is used to be arranged on one side of the moving path of the ingot to guide the magnetic field generated by the sensor to the ingot. The magnetic roller group includes at least one roller body and a magnet arranged in the roller body, and the magnet is located at the center of two magnetic field guide teeth in two adjacent rows and abuts against the inner wall of the roller body. The magnet is made of magnetic material.

[0008] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, the sensor further includes: an induction core, the induction core being disposed on a side of the magnetic conductive roller group away from the ingot, the induction core comprising a plurality of convex steps, the plurality of convex steps being spaced apart along an extension direction of the induction core, the magnetic field guide teeth being disposed on the convex steps; a coil, the coil being wound on the inductive core and located between two adjacent convex stages; A heat insulating member is provided at an end of the magnetic field guiding tooth close to the roller body.

[0009] 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 body, the arc surface at the bottom of the accommodating space is concentric with the roller body, and the distance from the center of the arc at the bottom of the U-shaped trough body to the top of the magnetic field guide tooth is less than the radius of the roller body. The shape of the U-shaped trough body can also be other open shapes.

[0010] For example, an electromagnetic stirring device provided in at least one embodiment of the present invention further includes an isolation component, which is arranged in the roller body. The isolation component includes a non-magnetic body, which is located between two adjacent magnetic bodies and whose ends abut against the two adjacent magnetic bodies. The side wall of the non-magnetic body abuts against the inner wall of the roller body, and the non-magnetic body is made of non-magnetic alloy steel material.

[0011] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, both the magnetic conductive body and the non-magnetic conductive body are provided with cooling water holes, and the cooling water holes are used to allow cooling water to flow in.

[0012] 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 provided at both ends of the roller sleeve, the magnetic roller group and the isolation assembly are both located in the roller sleeve, the end face of the shaft head close to one side of the roller sleeve abuts against the magnetic body and / or the non-magnetic body, the shaft head is used to support the roller sleeve, and the shaft head and roller sleeve are made of non-magnetic alloy steel.

[0013] 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 guide teeth.

[0014] For example, at least one embodiment of the present invention provides an electromagnetic stirring device, further comprising: an isolation sleeve, the isolation sleeve being arranged in the cooling water hole; 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 for connecting to an external water source.

[0015] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, guide grooves are provided on the inner walls of the magnetic conductor and the cooling water hole, and guide strips cooperating with the guide grooves are provided on the outer wall of the isolation sleeve.

[0016] For example, in an electromagnetic stirring device provided by at least one embodiment of the present invention, a clearance groove is provided on the outer walls of the magnetic conductor and the non-magnetic conductor, and the clearance groove extends in a straight line and passes through the axial direction of the roller body. The roller body also includes a filling strip, which is plugged into the clearance groove. A positioning hole is provided at the end of the shaft head close to the roller body, and the end of the filling strip is plugged into the positioning hole.

[0017] The beneficial effects of the present invention are: The inductor of the present invention is installed behind the magnetic roller group, that is, on the side of the magnetic roller group away from the casting, where the space is large and can be installed with a high-power inductor to provide a strong traveling wave magnetic field that fully meets the requirements of the continuous casting process. The traveling wave magnetic field generated by the inductor acts on the casting through the magnetic field guide tooth array and the magnetic roller group within the magnetic field guide tooth array. The magnetic circuit is short, the magnetic resistance is low, the magnetic field efficiency is high, the action area is large, and the casting can obtain a greater electromagnetic stirring force. As a result, the casting can obtain a strong stirring force that fully meets the requirements of the continuous casting process, which is of great significance for the production of extra-thick castings such as ship plates and offshore platform plates. According to the needs, the magnetic roller group can be composed of one roller or multiple rollers. Multiple rollers can be matched with high-power sensors. The magnetic field has a large effective area and strong stirring ability, which can drive the liquid core in the casting to flow over a large area, achieving better process effects. The continuous casting support rollers and magnetic roller groups operate in a harsh environment. The inductor described in the present invention is installed behind the magnetic roller group, reducing the impact of extreme high temperature and high humidity on the inductor and extending its life. The magnetic roller group not only performs the magnetic function, but also supports the roller body through the magnets, and has similar mechanical strength to conventional support rollers. Its lifespan is basically the same as that of conventional support rollers, saving maintenance costs for the steel industry. In addition, the present 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 of continuous casting products and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for describing the embodiments of the present invention. Obviously, the drawings described below are merely exemplary embodiments of the present invention. Those skilled in the art can, without inventive effort, derive other drawings based on the contents of the exemplary embodiments of the present invention and these drawings.

[0019] Figure 1 This is a schematic structural diagram of an electromagnetic stirring device supporting a casting blank in one embodiment of the present invention; Figure 2 for Figure 1 A schematic structural diagram of an electromagnetic stirring device in an embodiment of the present invention; Figure 3 This is a structural schematic diagram of another embodiment of the present invention in which the roller body is one; Figure 4 for Figure 1 Schematic diagram of the internal structure of the roller body in the embodiment; Figure 5 for Figure 1 Schematic diagram of the distribution structure of the magnetic conductor and the sub-magnetic conductor in the embodiment; Figure 6 for Figure 1 A schematic structural diagram of a magnetic conductor in an embodiment of the present invention; Figure 7 for Figure 1 A schematic diagram of the partial structure of the roller body in the embodiment; Figure 8 for Figure 7 A in the figure shows the enlarged structural diagram; Figure 9 It is a schematic diagram of the structure inside the roller from another angle; Figure 10 for Figure 9 A schematic diagram of the structure at point B in FIG. Figure 11 for Figure 4 The enlarged structural diagram at C in FIG. Figure 12 Schematic diagram of the sensor structure.

[0020] In the figure: 110, roller body; 200, casting billet; 300, sensor; 310, magnetic field guide tooth; 311, accommodating space; 400, magnetic roller group; 410, magnetic conductor; 500, isolation component; 510, non-magnetic conductor; 420, cooling water hole; 111, roller sleeve; 112, shaft head; 320, iron core; 330, coil; 340, thermal insulation; 600, isolation sleeve; 700, rotary joint; 430, guide groove; 610, guide strip; 440, give way groove; 113, filling strip; 1121, positioning hole. DETAILED DESCRIPTION The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0021] To simplify the drawings, only portions relevant to the invention are schematically depicted in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one component with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0022] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0023] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0025] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] like Figure 1As shown, an electromagnetic stirring device in one embodiment of the present invention is provided in the secondary cooling zone of the continuous casting production line. In the secondary cooling zone, the surface of the ingot 200 crystallizes and solidifies to form a shell, and the interior of the shell is still high-temperature molten steel. In the secondary cooling zone, the ingot 200 gradually completes internal crystallization and solidification during transportation until the center is completely solidified. The transportation of the ingot 200 is generally completed by supporting rollers. During the transportation process, the electromagnetic force generated by the electromagnetic stirring device can act on the interior of the ingot 200 to reduce shrinkage holes and cracks in the ingot 200. In order to improve the efficiency of electromagnetic stirring, obtain a stronger magnetic field force, and at the same time meet the support performance of the ingot 200 during transportation, the electromagnetic stirring device proposed in this embodiment includes an inductor 300 and a magnetic roller group 400. The ingot 200 and the sensor 300 are respectively located on both sides of the magnetic roller group 400. The sensor 300 includes a number of magnetic field guide teeth 310. The magnetic field guide teeth 310 are distributed in an array and divided into at least two rows. An accommodating space 311 is formed between two adjacent rows of magnetic field guide teeth 310. The magnetic roller group 400 is arranged in the accommodating space 311. The magnetic roller group 400 includes at least one roller body 110 and a magnet 410 arranged in the roller body 110. The magnet 410 is in contact with the inner wall of the roller body 110. The magnetic field guide teeth 310 of the sensor 300 cover the outer peripheral wall of the roller body 110, and the magnet 410 is located inside the roller body 110 corresponding to the position of the magnetic field guide teeth 310. The roller body 110 is made of heat-resistant non-magnetic alloy steel, and the magnet 410 is made of high-temperature resistant magnetic material. The magnetic field generated by the sensor 300 is guided to the ingot 200 through the magnetic roller group 400. After the inductor 300 is passed with alternating current, a traveling wave magnetic field is formed. The magnetic field acts on the unsolidified liquid core in the ingot 200 through the array-distributed magnetic field guide teeth 310 and the magnetic roller group 400, promoting the flow of the liquid core and achieving stirring of the molten steel in the ingot 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 group 400, that is, on the side away from the ingot 200. The installation position is large, and a high-power inductor 300 can be installed. The magnet 410 and the magnetic field guide teeth 310 provide a low magnetic resistance channel for the magnetic field generated by the inductor 300, which greatly improves the efficiency of the magnetic field. There can be multiple rollers 110 in the magnetic roller group 400, and combined with a high-power inductor 300, the magnetic field action area is increased, so that a larger area of ​​molten steel can obtain electromagnetic stirring force, providing a stronger technical means for optimizing the continuous casting process. Therefore, the number of rollers 110 is not limited here, and one roller 110 can correspond to one inductor 300, that is, Figure 3 The magnetic roller group 400 may also include more than two roller bodies 110, and the multiple roller bodies 110 are arranged in parallel and spaced apart, that is, Figure 1 and Figure 2The structure shown. The number of rollers 110 and the center distance between two adjacent rollers 110 must be determined according to the needs of the continuous casting process. The greater the number of rollers 110 and the greater the center distance, the larger the effective area of ​​the magnetic field generated by the inductor 300, thereby providing more molten steel in the liquid core of the steel billet with stirring force. On the other hand, the increase in the number of rollers 110 also means that the area occupied by the inductor 300 increases, which may exceed the range allowed by the continuous casting machine. Therefore, a comprehensive balance must be maintained between the effective area of ​​the magnetic field and the installation locations of the inductor 300 provided by the continuous casting machine.

[0027] Along the axial extension direction of the roller body 110, the inductor 300 has a plurality of spaced magnetic field guide teeth 310. The space between two adjacent rows of magnetic field guide teeth 310 may be as follows: Figure 12 In the illustrated U-shaped trough, the arc diameter at the bottom of the U-shaped trough is 10 to 50 mm larger than the diameter of the roller 110, and the distance from the center of the arc at the bottom of the U-shaped trough to the top of the magnetic field guide teeth 310 is 10 to 50 mm less than the radius of the roller 110. A typical roller 110 diameter is between 100 and 300 mm. This means that the arc diameter at the bottom of the U-shaped trough increases by 10 to 50 mm, while the distance from the center of the arc at the bottom of the U-shaped trough to the top of the magnetic field guide teeth 310 decreases by 10 to 50 mm. The bottom of the U-shaped trough can be concentric with the roller 110, thereby reducing the risk of collision between the roller 110 and the U-shaped trough even if axial runout occurs during roller 110 rotation. The bottom of the U-shaped trough can also have other shapes besides an arc. The accommodation space 311 can also have other opening shapes, as long as it can be arranged around the outer circumferential wall of the roller 110 without affecting the rotation of the roller 110. The roller 110 can rotate about its own axis to support the cast strand 200. The electromagnetic stirring equipment is placed on one side of the moving path of the ingot 200. When the thickness of the ingot 200 is relatively thick, electromagnetic stirring devices can also be set on both sides of the ingot 200. It should be noted that the ingot 200 and the sensor 300 should be located on both sides of the roller body 110 respectively, so as to isolate the heat of the ingot 200 through the roller body 110 and extend the service life of the sensor 300.

[0028] like Figure 2 As shown, the inductor 300 is positioned on the side of the roller 110 away from the ingot 200. The magnetic field guide teeth 310 of the inductor 300 are spaced apart along the axial direction of the roller 110, on the side of the inductor core 320 facing the roller 110. The roller 110 is positioned between two adjacent rows of magnetic field guide teeth 310. The inductor 300 is mounted on the side of the roller 110 away from the ingot 200, providing a larger installation space and suitable for high-power inductors 300. The roller 110, the magnetic conductor 410, and the array of magnetic field guide teeth 310 provide a low-reluctance channel for the magnetic field generated by the inductor 300, significantly improving the efficiency of the magnetic field.

[0029] See further Figure 3and Figure 4 The number of magnetizers 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 magnetizer 410 is located at the center of two adjacent magnetic field guide teeth 310 in two corresponding rows. The outer peripheral wall of the magnetizer 410 is in close contact with the inner wall of the roller body 110. When the roller body 110 is subjected to radial pressure from the casting slab 200, the pressure is transmitted to the magnetizer 410 through the inner wall of the roller body 110, and the magnetizer 410 provides radial support for the roller body 110. Preferably, the magnetizer 410 is arranged concentrically with the roller body 110 to facilitate its installation. The magnetizer 410 is made of a high-temperature resistant magnetic material, such as an iron-cobalt alloy, an iron-based alloy with added elements such as chromium and silicon, etc.

[0030] During operation, the roller body 110 rotates around its axis under the influence of an external drive device. As the strand 200 is conveyed, an alternating current flows through the coil 330 of the inductor 300, generating an alternating magnetic field. This alternating magnetic field is transmitted through the induction core 320 to the magnetic field guide teeth 310. The magnetic field guide teeth 310 direct the magnetic field toward the magnetizer 410 within the roller body 110. Because the magnetizer 410 is located at the center of the magnetic field guide teeth 310, the magnetic field is primarily transmitted through the magnetizer 410 as it passes through the wall of the roller body 110, subsequently acting on the interior of the strand 200. The alternating magnetic field acts on the unsolidified molten steel within the strand 200, generating an induced current. This induced current, under the influence of electromagnetic force in the magnetic field, drives the molten steel to flow, thereby stirring the molten steel within the strand 200.

[0031] In this embodiment, the roller body 110, in conjunction with the magnetizer 410, guides the magnetic field while providing stable support for the ingot 200. The magnetic field guide teeth 310 of the inductor 300 are spaced axially along the roller body 110 and arranged around the outer wall of the roller body 110 on the side away from the ingot 200. This shortens the distance between the magnetic field source and the ingot 200 and reduces the divergence loss of the magnetic field. The magnetizer 410, located at the center of the magnetic field guide teeth 310, can provide directional guidance for the magnetic field generated by the magnetic field guide teeth 310, allowing the magnetic field to more concentratedly penetrate the wall of the roller body 110 and enter the ingot 200. This reduces magnetic field loss in the non-magnetic conductive portion of the roller body 110, improves the utilization efficiency of the magnetic field, and thereby enhances the stirring force on the molten steel within the ingot 200. At the same time, the magnet 410 abuts against the inner wall of the roller body 110, and can bear radial force when the roller body 110 is subjected to pressure from the ingot 200, thereby ensuring the structural strength of the roller body 110 and avoiding weakening the supporting capacity of the roller body 110 due to the setting of the magnetic field guiding structure. It solves the problems of large magnetic resistance of the existing box-type stirring device, insufficient supporting force of the embedded stirring device, and limited power of the roller-type stirring device, so that the electromagnetic stirring device can provide sufficient stirring force for large-sized ingots 200 to eliminate central shrinkage holes and cracks and increase the equiaxed crystal ratio, and can also ensure stable support for the ingot 200 to meet the process requirements of continuous casting production.

[0032] Further, refer to Figure 4 The electromagnetic stirring device also includes an isolation assembly 500. The isolation assembly 500 is arranged in the roller sleeve 111 of the roller body 110. The isolation assembly 500 is composed of a non-magnetic conductive body 510, which is made of a non-magnetic alloy steel such as stainless steel. The non-magnetic conductive body 510 of the isolation assembly 500 is located between two adjacent magnetic conductive bodies 410. Its two end faces are tightly abutted against the end faces of the adjacent magnetic conductive bodies 410, and its side walls are tightly abutted against the inner wall of the roller sleeve 111, forming a structure in which the magnetic conductive bodies 410 and the non-magnetic conductive bodies 510 are alternately arranged along the axial direction of the roller body 110. The alternating arrangement of the non-magnetic conductive bodies 510 and the magnetic conductive bodies 410 can not only achieve uniform distribution of the molten steel inside the ingot 200 under the action of the electromagnetic force, but also fill the space inside the roller body 110 to ensure the support performance of the roller body 110, and can achieve stable support even for large-sized ingots 200.

[0033] Reference Figure 5 and Figure 6 In order to ensure that the temperature of the magnetizer 410 does not exceed the allowable operating temperature, cooling water holes 420 are axially opened in the centers of the magnetizer 410 and the non-magnetizer 510. The cooling water holes 420 pass through both ends of the magnetizer 410 and the non-magnetizer 510 and are connected in sequence to form a passage for cooling water to pass through.

[0034] like Figure 3 As shown, the roller body 110 includes a roller sleeve 111 and a shaft head 112. The shaft head 112 is provided at both ends of the roller sleeve 111 and is used to install bearings and bearing seats. The end surface of the shaft head 112 close to the roller sleeve 111 abuts against the end surfaces of the conductive magnet 410 and the non-conductive magnet 510. The shaft head 112 forms an axial positioning for the conductive magnet 410 and the non-conductive magnet 510 in the roller sleeve 111, thereby securing the roller body 110. The roller sleeve 111 and the shaft head 112 of the roller body 110 are designed as separate parts. The shaft head 112 supports the roller sleeve 111 by abutting against the conductive magnet 410 and the non-conductive magnet 510. This simplifies the processing difficulty of the roller sleeve 111. At the same time, the shaft head 112 axially positions the conductive magnet 410 and the non-conductive magnet 510, ensuring the positional stability of the internal components during the rotation of the roller body 110 and preventing the magnetic field guidance effect from being affected by relative displacement. The roller sleeve 111 and the shaft head 112 can be connected by welding, forming a rigid structure with improved support strength. The roller sleeve 111 is made of heat-resistant, non-magnetic alloy steel and is generally 20 to 30 mm thick to ensure support strength. The length of the roller sleeve 111 is greater than the width of the ingot 200, typically ranging from 100 to 300 mm.

[0035] During operation, the non-magnetic body 510 separates adjacent magnetic bodies 410 to avoid direct transmission of the magnetic field between adjacent magnetic bodies 410; cooling water is introduced into the cooling water hole 420, and the water flows axially through the magnetic bodies 410 and the non-magnetic body 510, taking away the heat generated by the magnetic field and the heat transfer of the ingot 200 during operation of the roller body 110; the shaft head 112 abuts against the magnetic bodies 410 and the non-magnetic body 510 to limit their axial displacement, thereby ensuring the stability of the relative position of the roller sleeve 111 and the internal components, while bearing part of the radial force to enhance the overall support strength of the roller body 110.

[0036] In this embodiment, the non-magnetic conductor 510 of the isolation assembly 500 is located between adjacent magnets 410. Its non-magnetic properties block the magnetic field path between adjacent magnets 410, preventing magnetic field short-circuits between the magnets 410. This allows the magnetic field to be more concentratedly directed through the magnets 410 toward the ingot 200, further improving magnetic field utilization efficiency. Together with the magnetic field guide teeth 310 and the magnets 410, the stirring force is enhanced. Furthermore, the non-magnetic conductor 510 abuts the inner wall of the roller body 110, and together with the magnets 410, provides radial support for the roller sleeve 111. This, combined with the axial positioning of the shaft head 112, enhances the overall structural strength of the roller body 110, making it suitable for supporting large-sized ingots 200. The cooling water holes 420 on the magnetic conductor 410 and the non-magnetic conductor 510 provide circulation channels for the cooling medium. By continuously passing cooling water, the heat inside the roller body 110 can be taken away in time, avoiding the roller body 110 from being overheated due to long-term work and affecting its mechanical properties or magnetic field stability, thereby extending the service life of the equipment. It cooperates with the roller sleeve 111 and the shaft head 112 structure of the roller body 110 to ensure the compatibility of the cooling system and the support structure.

[0037] Reference Figure 1 、 Figure 3 The inductor 300 also includes an induction core 320, a coil 330 and a thermal insulation member 340. The induction core 320 is located on the side of the roller body 110 away from the ingot 200, and is provided with a number of convex steps arranged at intervals, and the magnetic field guide teeth 310 are provided on the convex steps. The coil 330 is wound on the induction core 320 and is located between two adjacent convex steps. The thermal insulation member 340 is provided at the end of the magnetic field guide tooth 310 close to the roller body 110 and is fixedly connected to the end of the magnetic field guide tooth 310. The magnetic field guide tooth 310 and the convex step can be an integrated structure or a split structure design. When the magnetic field guide tooth 310 and the convex step are in a split structure, the two are connected by a connecting plate. When the magnetic field guide tooth 310 is damaged, it can be replaced separately, thereby reducing the maintenance cost of the electromagnetic stirring device. The coil 330 is wound on the yoke of the inductive core 320. The winding form is a Cramer winding, and the number of windings is 3 to 12 groups. It can be connected in a two-phase working mode or a three-phase working mode. The phase angle of the two-phase working mode is 90 degrees, and the phase angle of the three-phase working mode is 120 degrees.

[0038] In this embodiment, when the inductor 300 is operating, an alternating current flows through the coil 330, causing the induction core 320 to generate an alternating magnetic field. This magnetic field is then directed through the magnetic field guide teeth 310 to the magnetizer 410 within the roller body 110. The thermal insulator 340 reduces heat transfer between the roller body 110 and the magnetic field guide teeth 310, thereby reducing the amount of heat transferred from the casting 200 through the magnetic field guide teeth 310 to the induction core 320 and the coil 330. The induction core 320 provides a mounting base for the magnetic field guide teeth 310 and the coil 330. The coil 330 wound around the induction core 320 enhances the magnetic field strength. The integrated design of the magnetic field guide teeth 310 and the induction core 320 ensures the continuity of the magnetic field transmission, reduces magnetic field losses at the connection, and, in conjunction with the magnetizer 410, further improves the efficiency of magnetic field transmission to the casting 200. The thermal insulation member 340 is arranged between the magnetic field guide teeth 310 and the roller body 110, which can prevent the heat of the roller body 110 from being transferred to the sensor 300, prevent the coil 330 from aging due to high temperature or the magnetic conductivity of the induction core 320 from being affected by temperature changes, ensure the long-term stable operation of the sensor 300, and cooperate with the cooling function of the cooling water hole 420 to block heat transfer from different positions and improve the thermal stability of the equipment.

[0039] Further, refer to Figure 4 、 Figures 7 to 11 The electromagnetic stirring device also includes an isolation sleeve 600 and a rotary joint 700. The isolation sleeve 600 is arranged in the cooling water hole 420, and its outer wall is in contact with the inner wall of the cooling water hole 420. The inner walls of the cooling water holes 420 of the magnet 410 and the non-magnet 510 are provided with guide grooves 430, which extend axially along the cooling water hole 420; the outer wall of the isolation sleeve 600 is provided with guide bars 610, which are plugged into the guide grooves 430 to limit the relative rotation between the isolation sleeve 600 and the magnet 410 and the non-magnet 510. The rotary joint 700 is arranged at both ends of the isolation sleeve 600, one end of which is fixedly connected to the end of the isolation sleeve 600, and the other end is connected to an external water source through a pipeline. When the roller body 110 rotates, the fixed end of the rotary joint 700 remains relatively stationary with the external water source, and the rotating end rotates synchronously with the isolation sleeve 600 and the roller body 110.

[0040] In this embodiment, the isolation sleeve 600 is disposed within the cooling water hole 420 to prevent direct contact of the cooling water with the magnetizer 410 and the non-magnetizer 510, thereby reducing erosion and corrosion of the magnetizer 410 and the non-magnetizer 510 by the water flow and extending their service life. Simultaneously, the isolation sleeve 600 is in close contact with 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 body 110. The guide groove 430 cooperates with the guide bar 610 to limit the relative rotation of the isolation sleeve 600 and the magnetizer 410 and the non-magnetizer 510, ensuring that the isolation sleeve 600 rotates synchronously with the roller body 110 and preventing component wear due to relative friction. The rotary joint 700 achieves 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 body 110. Together with the cooling water hole 420, it forms a complete cooling circulation system, improving the stability and reliability of cooling. Furthermore, the provision of the guide grooves 430 and guide strips 610 also provides guidance during the assembly of the roller body 110, the magnetic roller assembly 400, and the isolation assembly 500. During assembly, a shaft head 112 is first installed at the end of the roller sleeve 111 and the isolation sleeve 600 is secured to the shaft head 112. The magnetic conductor 410 and the non-magnetic conductor 510 are then sequentially installed into the roller sleeve 111. As the magnetic conductor 410 and the non-magnetic conductor 510 enter the roller sleeve 111, the guide strips 610 and the guide grooves 430 slide together to provide guidance, ensuring concentricity between the magnetic conductor 410, the non-magnetic conductor 510, and the roller sleeve 111, thus preventing the magnetic conductor 410 and the non-magnetic conductor 510 from skewing or colliding during entry into the roller sleeve 111.

[0041] The length of the magnetizer 410 extends axially along the roller body 110 and is greater than or equal to the axial width of the magnetic field guide teeth 310 along the roller body 110. That is, the projection of the magnetic field guide teeth 310 in the axial direction of the roller body 110 completely falls within the axial range of the magnetizer 410.

[0042] Further references Figure 3 The length of the magnetizer 410 is greater than or equal to the width of the magnetic field guide teeth 310, which can ensure that the magnetic field generated by the magnetic field guide teeth 310 is completely received by the magnetizer 410 in the axial direction, avoiding the magnetic field diverging to both sides due to insufficient length of the magnetizer 410, further reducing the magnetic field loss, and allowing more magnetic field to enter the ingot 200 through the magnetizer 410, cooperating with the guiding effect of the magnetic field guide teeth 310, enhancing the concentration of the magnetic field and improving the stirring effect on the molten steel.

[0043] In order to reduce the resistance when the magnetic conductor 410 and the non-magnetic conductor 510 enter the roller sleeve 111, a clearance groove 440 is opened on the outer wall of the magnetic conductor 410 and the non-magnetic conductor 510. The clearance groove 440 extends in a straight line and passes through the roller body 110 axially, that is, Figure 5The roller body 110 further includes a filling strip 113, which is plugged into the clearance groove 440, and the outer wall of the filling strip 113 abuts against the inner wall of the roller sleeve 111, as shown in FIG. Figure 11 shown.

[0044] Reference Figure 10 A positioning hole 1121 is provided at the end of the shaft head 112 close to the roller sleeve 111, and the positioning hole 1121 extends axially along the roller body 110; the two ends of the filling strip 113 are respectively plugged into the positioning holes 1121 of the shaft heads 112 on both sides to realize the axial positioning of the filling strip 113.

[0045] In this embodiment, the clearance groove 440 is plugged into the filling strip 113, and the outer wall of the filling strip 113 abuts against the inner wall of the roller sleeve 111, which can fill the gap between the magnetic conductor 410 and the non-magnetic conductor 510 and the inner wall of the roller sleeve 111, enhance the radial support of the roller sleeve 111, and prevent the roller sleeve 111 from being deformed due to excessive local force; at the same time, the filling strip 113 penetrates axially, and together with the magnetic conductor 410 and the non-magnetic conductor 510, forms a full circumferential support for the roller sleeve 111, thereby improving the structural stability of the roller body 110. The end of the filling strip 113 is plugged into the positioning hole 1121 of the shaft head 112, and the filling strip 113 is axially positioned by the shaft head 112 to avoid axial displacement of the filling strip 113 during the rotation of the roller body 110, thereby ensuring the stability of the fit between the filling strip 113 and the give way groove 440; at the same time, the positioning hole 1121 and the shaft head 112 cooperate in the positioning of the magnetic conductor 410 and the non-magnetic conductor 510 to achieve the overall positioning of the components inside 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.

[0046] 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 the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An electromagnetic stirring device, characterized in that: include: An inductor (300), the inductor (300) comprising a plurality of magnetic field guide teeth (310), the plurality of magnetic field guide teeth (310) being distributed in an array and divided into at least two rows, and an accommodation space (311) being formed between two adjacent rows of magnetic field guide teeth (310); A magnetic roller group (400) is provided in the accommodating space (311), and the magnetic roller group (400) is used to be provided on one side of the moving path of the ingot (200) to guide the magnetic field generated by the sensor (300) to the ingot (200), and the magnetic roller group (400) includes at least one roller body (110) and a magnet (410) provided in the roller body (110), and the magnet (410) is located at the center of two magnetic field guide teeth (310) in two adjacent rows and abuts against the inner wall of the roller body (110).

2. The electromagnetic stirring device according to claim 1, characterized in that: The sensor (300) further includes: an induction iron core (320), the induction iron core (320) being arranged on a side of the magnetic conductive roller group (400) away from the casting blank (200), the induction iron core comprising a plurality of convex steps, the plurality of convex steps being spaced apart along an extension direction of the induction iron core (320), and the magnetic field guide teeth (310) being arranged on the convex steps; a coil (330), the coil (330) being wound on the inductive iron core (320) and located between two adjacent convex stages; A heat insulating member (340) is provided at an end of the magnetic field guide tooth (310) close to the roller body (110).

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

4. The electromagnetic stirring device according to claim 1, characterized in that: The invention also includes an isolation component (500), wherein the isolation component (500) is arranged in the roller body (110), and the isolation component (500) includes a non-magnetic body (510), wherein the non-magnetic body (510) is located between two adjacent magnets (410) and an end thereof abuts against the two adjacent magnets (410), and a side wall of the non-magnetic body (510) abuts against an inner wall of the roller body (110), and the non-magnetic body (510) is made of a non-magnetic alloy steel material.

5. The electromagnetic stirring device according to claim 4, characterized in that: The magnetic conductive body (410) and the non-magnetic conductive body (510) are both provided with cooling water holes (420), and the cooling water holes (420) are used for introducing cooling water.

6. The electromagnetic stirring device according to claim 4, characterized in that: The roller body (110) comprises a roller sleeve (111) and shaft heads (112) provided at both ends of the roller sleeve (111); the magnetic roller group (400) and the isolation assembly (500) are both located in the roller sleeve (111); an end face of the shaft head (112) close to one side of the roller sleeve (111) abuts against the magnetic body (410) and / or the non-magnetic body (510); the shaft head (112) is used to support the roller sleeve (111); and the roller sleeve (111) and the shaft head (112) are both made of a non-magnetic alloy steel material.

7. 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 guide tooth (310), and the magnetic conductor (410) is made of magnetic conductive material.

8. The electromagnetic stirring device according to claim 5, characterized in that: Also includes: an isolation sleeve (600), the isolation sleeve (600) being disposed in the cooling water hole (420); A rotary joint (700) is provided at an 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.

9. The electromagnetic stirring device according to claim 8, 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).

10. The electromagnetic stirring device according to claim 6, characterized in that: A clearance groove (440) is provided on the outer walls of the magnetic conductor (410) and the non-magnetic conductor (510), and the clearance groove (440) extends in a straight line and passes through the axial direction of the roller body (110). The roller body (110) further includes a filling strip (113), and the filling strip (113) is plugged into the clearance groove (440). A positioning hole (1121) is provided at the end of the shaft head (112) close to the roller body (110), and the end of the filling strip (113) is plugged into the positioning hole (1121).

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