An electromagnetic stirrer for irregularly shaped billets

Abstract

This utility model discloses an electromagnetic stirrer for irregularly shaped billets, comprising a housing, an inductor installed inside the housing, the inductor including an iron core and a coil, the iron core including a strip-shaped magnetic yoke located inside the housing, a plurality of magnetic poles provided on one side of the magnetic yoke, a plurality of the coils wound on the magnetic yoke, one end of the magnetic poles extending out of the housing, and a mounting seat provided at each end of the upper and lower bottom surfaces of the magnetic yoke, one end of the mounting seat extending out of the housing. The electromagnetic stirrer for irregularly shaped billets of this application can be installed opposite each other on both sides of the fan-shaped section of an irregularly shaped billet continuous casting machine. The magnetic poles of the electromagnetic stirrer can pass through the gap between the support rollers of the fan-shaped section, allowing the magnetic poles to be closer to the flange of the irregularly shaped billet, thereby bringing the effective magnetic field closer to the billet, increasing the magnetic induction intensity of the billet, and achieving efficient traveling wave stirring. Traveling wave stirring can increase the feeding force of the billet, expand the electromagnetic stirring action area, and thus improve the quality of the billet.

Description

Technical Field

[0001] This utility model relates to the technical field of electromagnetic metallurgy, and more specifically, to an electromagnetic stirrer for irregularly shaped billets. Background Technology

[0002] As steel products trend towards larger sizes and higher added value, market demand for large H-beams and heavy H-beams continues to grow. In traditional production methods, these products require multiple rolling passes from conventional cast billets (such as slabs and square billets). This process is not only cumbersome and energy-intensive, but also suffers from significant metal loss and long production cycles, resulting in high overall production costs. Therefore, the industry is gradually exploring a process of "direct rolling of continuously cast shaped billets"—producing shaped billets with cross-sections similar to H-beams directly using continuous casting equipment, followed by subsequent rolling. This significantly shortens the process, reduces energy consumption and costs, and has become an important direction for cost reduction and efficiency improvement in the industry.

[0003] However, the special cross-sectional structure of irregular billets (such as H-shaped cross-sections including flanges, webs, and other different parts) presents unique quality challenges to its continuous casting process: the heat dissipation conditions and solidification rates of different parts of the irregular billet vary significantly, especially at the end of solidification on the flange side, where a triangular area is easily formed. Due to the final solidification in this area, the molten steel is not fed back in time, resulting in a high incidence of defects such as internal porosity and cracks, which seriously affect the mechanical properties and processing qualification rate of the irregular billet. This has become the core bottleneck restricting the promotion of the "direct rolling of continuously cast irregular billets" process.

[0004] To address this issue, existing electromagnetic stirring technology is difficult to directly adapt to the continuous casting scenario of irregularly shaped billets. Taking the existing patent "CN202410147995.8 A kind of irregularly shaped iron core type high-energy continuous casting traveling wave linear electromagnetic stirrer" as an example, although the cylindrical traveling wave linear electromagnetic stirrer disclosed therein can be used for stirring some billets, it has two major drawbacks: the irregularly shaped billet continuous casting machine has corresponding support rollers on the flange side of the irregularly shaped billet, and there is no space to install a cylindrical electromagnetic stirrer; the disc-shaped coil of the linear stirrer results in the stirrer's electromagnetic wire being too long, with relatively large resistance and inductance, the stirrer voltage being too high, or the frequency being too low, making it difficult to guarantee the stirring force, and the temperature rise being too large, requiring an excessively large cooling water system. Utility Model Content

[0005] In view of the above-mentioned technical problems in related technologies, this utility model provides an electromagnetic stirrer for irregularly shaped billets, which can solve the above problems.

[0006] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: An electromagnetic stirrer for irregularly shaped billets includes a housing, inductors installed inside the housing, and the inductors comprising an iron core and coils. The iron core includes a strip-shaped magnetic yoke located within the housing. One side of the magnetic yoke has a plurality of magnetic poles, and a plurality of coils are wound around the magnetic yoke. One end of each magnetic pole extends out of the housing and is inserted between adjacent side support rollers of a sector section of an irregularly shaped billet continuous casting machine. The side support rollers are made of a non-magnetic material. Mounting plates are respectively provided at both ends of the upper and lower bottom surfaces of the magnetic yoke, and one end of each mounting plate extends out of the housing.

[0007] Furthermore, a terminal box is connected to one bottom surface of the housing, and the terminal box is provided with a plurality of cables for connecting the coil.

[0008] Furthermore, the outlet box is also connected to an inlet / outlet water pipe, which communicates with the inner cavity of the housing.

[0009] Furthermore, when the sensor is connected to a two-phase frequency converter, the number of coils is 2N, the number of magnetic poles of the iron core is 2N+1, where N is a positive integer greater than 0, and the phase angle of the two-phase current corresponding to the sensor is 90°.

[0010] Furthermore, when the sensor is connected to a three-phase frequency converter, the number of coils is 3N, the number of magnetic poles of the iron core is 3N+1, where N is a positive integer greater than 0, and the phase angle of the three-phase current corresponding to the sensor is 120°.

[0011] Furthermore, the extended end of the mounting plate is provided with a bolt hole.

[0012] Furthermore, the mounting plate is connected to the mounting base on the side of the fan-shaped section of the shaped billet continuous casting machine via a bolt assembly, and the mounting base is provided with a second bolt hole that matches the first bolt hole.

[0013] The beneficial effects of this utility model are as follows: The electromagnetic stirrer for irregular billets of this application can be installed opposite each other on both sides of the fan-shaped section of the irregular billet continuous casting machine. The magnetic poles of the electromagnetic stirrer can be inserted through the gap between the outer support rollers of the fan-shaped section, so that the magnetic poles are closer to the flange of the irregular billet, thereby bringing the effective magnetic field closer to the billet, increasing the magnetic induction intensity of the billet, and realizing efficient traveling wave stirring. Traveling wave stirring can increase the feeding force of the billet, expand the electromagnetic stirring action area, and thus improve the quality of the billet. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] The present invention will now be described in further detail with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of an electromagnetic stirrer for irregular billets installed in the sector section of an irregular billet continuous casting machine, as described in an embodiment of this utility model. Figure 2 This is a schematic diagram of the structure of the sector section of the irregular billet continuous casting machine according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the side support roller described in an embodiment of the present invention; Figure 4 This is an exploded view of an electromagnetic stirrer for irregularly shaped blanks according to an embodiment of this utility model; Figure 5 This is a top view of an electromagnetic stirrer for irregularly shaped blanks according to an embodiment of this utility model; Figure 6 This is a side view of an electromagnetic stirrer for irregularly shaped blanks according to an embodiment of this utility model; Figure 7 This is a front view of an electromagnetic stirrer for irregularly shaped blanks according to an embodiment of this utility model; Figure 8 yes Figure 5 Cross-sectional view of AA in the middle; Figure 9 yes Figure 7 Cross-sectional view of BB in the middle; Figure 10 This is a cross-sectional view of an electromagnetic stirrer for irregular billets installed on both sides of a sector section of an irregular billet continuous casting machine, as described in an embodiment of this utility model. Figure 11 This is a 3D cross-sectional view of an electromagnetic stirrer for irregular billets installed on both sides of a sector section of an irregular billet continuous casting machine, as described in this embodiment of the utility model. Figure 12 This is a schematic diagram of the downward stirring of an electromagnetic stirrer for irregularly shaped billets according to an embodiment of this utility model; Figure 13 This is a schematic diagram of the upward stirring of an electromagnetic stirrer for irregularly shaped billets according to an embodiment of the present invention; Figure 14 This is a simulation diagram of the magnetic induction intensity of an electromagnetic stirrer for irregularly shaped blanks according to an embodiment of this utility model; Figure 15 This is a simulation diagram of the electromagnetic force of an electromagnetic stirrer for irregularly shaped billets according to an embodiment of this utility model.

[0017] In the picture: 1. Electromagnetic stirrer for irregular billets; 1-1. Inductor; 1-11. Iron core; 1-111. Magnetic yoke; 1-112. Magnetic pole; 1-12. Coil; 1-13. Mounting plate; 1-2. Housing; 1-21. Terminal box; 1-22. Cable; 1-23. Inlet and outlet water pipes; 2. Sector section of irregular billet continuous casting machine; 21. Side support roller; 211. Support roller mounting base; 212. Roller body; 23. Mounting base; 3. Irregular billet. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0019] like Figure 1-11 As shown, this utility model discloses an electromagnetic stirrer for irregularly shaped billets, including a housing 1-2. An inductor 1-1 is installed inside the housing 1-2. The inductor 1-1 includes an iron core 1-11 and a coil 1-12. The iron core 1-11 includes a strip-shaped magnetic yoke 1-111 located inside the housing 1-2. A plurality of magnetic poles 1-112 are provided on one side of the magnetic yoke 1-111. A plurality of the coils 1-12 are wound on the magnetic yoke 1-111. One end of the magnetic pole 1-112 extends out of the housing 1-2. The extended end of the magnetic pole 1-112 is inserted between the side support rollers 21 of the fan-shaped segment of the irregularly shaped billet. The side support rollers 21 are made of non-magnetic material. A mounting plate 1-13 is provided at both ends of the upper and lower bottom surfaces of the magnetic yoke 1-111. One end of the mounting plate 1-13 extends out of the housing 1-2.

[0020] In one specific embodiment of this application, a wiring box 1-21 is connected to a bottom surface of the housing 1-2. The wiring box 1-21 is provided with a plurality of cables 1-22 for connecting the coil 1-12. One end of the cable 1-22 is connected to a corresponding power supply for controlling the sensor 1-1.

[0021] In a specific embodiment of this application, the outlet box 1-21 is also connected to an inlet and outlet water pipe 1-23, including an inlet water pipe and an outlet water pipe. The inlet and outlet water pipe 1-23 communicates with the inner cavity of the housing 1-2. At the same time, the inlet and outlet water pipe 1-23 is also connected to a cooling system to cool the working shaped billet electromagnetic stirrer.

[0022] In a specific embodiment of this application, the extended end of the mounting plate 1-13 is provided with bolt hole 1, which can be used to connect the shaped billet electromagnetic stirrer of this application to both sides of the sector section of the continuous casting machine through the bolt assembly and bolt hole 1 (that is, bolt hole 1 and bolt hole 2 are opposite to each other and locked by bolt assembly).

[0023] In a specific embodiment of this application, such as Figure 1-3 and Figure 10-11 As shown, the shaped billet electromagnetic stirrer 1 of this application can be installed opposite to each other on both sides of the fan-shaped section 2 of the shaped billet continuous casting machine. The magnetic poles 1-112 of the shaped billet electromagnetic stirrer 1 can be inserted through the gap between the fan-shaped section side support rollers 21 (including support roller mounting base 211 and roller body 212) to make the magnetic poles closer to the flange of the shaped billet 3.

[0024] In a specific embodiment of this application, inductor 1-1 can be a two-phase inductor, in which case the number of coils is 2N, the number of magnetic poles in the iron core is 2N+1, and the phase angle of the corresponding two-phase current (phase A, phase B) is 90°; inductor 1-1 can also be a three-phase inductor, in which case the number of coils is 3N, the number of magnetic poles in the iron core is 3N+1, and the phase angle of the corresponding three-phase current (phase A, phase B, phase C) is 120°, where N is a positive integer greater than 0. Figure 14-15 As shown, when alternating current is applied to the shaped billet electromagnetic stirrer, the magnetic field of the opposing shaped billet electromagnetic stirrer can pass through the billet, forming a thrust along the casting flow direction of the billet.

[0025] In one specific embodiment of this application, the electromagnetic stirrers for the irregularly shaped billet are installed opposite each other on both sides of the fan-shaped section, and are controlled by corresponding power supplies, enabling simultaneous upward stirring (e.g. Figure 13 As shown), stir downwards simultaneously (as shown). Figure 12 As shown), there are four mixing modes: left side up, right side down, left side down, and right side up.

[0026] This utility model also discloses an electromagnetic stirring method for irregularly shaped billets, which specifically includes the following steps: S1: The PLC control unit controls the frequency converter connected to the shaped billet electromagnetic stirrer to power on, and the shaped billet electromagnetic stirrer starts to work, generating a traveling wave magnetic field to drive the molten steel. The frequency converters on both sides are powered on, so that the electromagnetic force generated by the shaped billet electromagnetic stirrer is downward. Power is applied for A minutes, and then stopped for B minutes. The current is C amperes, and the frequency is D hertz, where A is 1~20, B is 1~5, C is 500~1200, and D is 5~8. S2: The PLC control unit controls the inverter power supply to be energized and changes the phase sequence of the inverter power supply on the left and right sides, so that the electromagnetic force generated by the electromagnetic stirrer of the shaped billet is upward. The power is energized for E minutes and then stopped for F minutes. The current is G amperes and the frequency is H Hz, where E is 1~10, F is 1~2, G is 100~500, and H is 2~5. S3: Repeat S1 and S2.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electromagnetic stirrer for irregularly shaped billets, characterized in that, The device includes a housing (1-2), in which a sensor (1-1) is installed. The sensor (1-1) includes an iron core (1-11) and a coil (1-12). The iron core (1-11) includes a strip magnetic yoke (1-111) located inside the housing (1-2). One side of the magnetic yoke (1-111) is provided with several magnetic poles (1-112). Several coils (1-12) are wound on the magnetic yoke (1-111). One end of the magnetic pole (1-112) extends out of the housing (1-2). The extended end of the magnetic pole (1-112) is inserted between adjacent side support rollers (21) of the fan-shaped section of the shaped billet continuous casting machine. The side support rollers (21) are made of non-magnetic material. At both ends of the upper and lower bottom surfaces of the magnetic yoke (1-111), there is a mounting plate (1-13). One end of the mounting plate (1-13) extends out of the housing (1-2).

2. The electromagnetic stirrer for irregularly shaped billets according to claim 1, characterized in that, A cable outlet box (1-21) is connected to one bottom surface of the housing (1-2), and the cable outlet box (1-21) is provided with a plurality of cables (1-22) for connecting the coil (1-12).

3. The electromagnetic stirrer for irregularly shaped billets according to claim 2, characterized in that, The outlet box (1-21) is also connected to an inlet / outlet water pipe (1-23), which is connected to the inner cavity of the housing (1-2).

4. The electromagnetic stirrer for irregularly shaped billets according to claim 1, characterized in that, When the sensor (1-1) is connected to a two-phase frequency converter, the number of coils (1-12) is 2N, the number of magnetic poles of the iron core (1-11) is 2N+1, where N is a positive integer greater than 0, and the phase angle of the two-phase current corresponding to the sensor (1-1) is 90°.

5. The electromagnetic stirrer for irregularly shaped billets according to claim 1, characterized in that, When the inductor (1-1) is connected to a three-phase frequency converter, the number of coils (1-12) is 3N, the number of magnetic poles of the iron core (1-11) is 3N+1, where N is a positive integer greater than 0, and the phase angle of the three-phase current corresponding to the inductor (1-1) is 120°.

6. The electromagnetic stirrer for irregularly shaped billets according to claim 1, characterized in that, The protruding end of the mounting plate (1-13) has a bolt hole.

7. The electromagnetic stirrer for irregularly shaped billets according to claim 6, characterized in that, The mounting plate (1-13) is connected to the mounting seat (23) on the side of the fan-shaped section of the shaped billet continuous casting machine by means of bolt assembly. The mounting seat (23) is provided with a bolt hole two that matches the bolt hole one.

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