Electromagnetic stirring system and electromagnetic stirrer for casting blank

Abstract

The utility model provides an electromagnetic stirring system and an electromagnetic stirrer for casting blanks. The electromagnetic stirrer comprises a first iron core with an opening and a coil structure wound on the first iron core; seen from the height direction of the electromagnetic stirrer, a groove defined by the first iron core with the opening is a T-shaped groove; when the coil structure is powered on, an N pole and an S pole which are arranged towards each other are formed on the first iron core.

Description

TECHNICAL FIELD

[0001] The utility model relates to continuous casting magnetoelectric equipment technical field especially relates to a kind of combined electromagnetic stirrer suitable for beam blank. BACKGROUND

[0002] With the rapid development of China's steel industry, continuous casting machine applied to steel industry also develops, along with electromagnetic stirrer technology also develops continuously.Effect of electromagnetic stirrer inductor is to excite alternating magnetic field when three-phase or two-phase alternating current is passed, alternating magnetic field induces current in metal liquid, and metal liquid with induced current is forced to move and is stirred in magnetic field, so as to improve the internal structure of casting blank.

[0003] In the high-efficiency and energy-saving building steel variety, H-shaped casting blank is widely favored due to many advantages such as saving structural weight, strong bearing capacity and good cross-section stability, and becomes one of the most rapidly developed and most used economic cross-section steel sections. Figure 1-1 As shown in the figure, the H-shaped casting blank 20 has two wing parts 201, a connecting part 202 connecting the two wing parts 201, and from the height direction of the H-shaped casting blank (the top view direction), the two wing parts 201 and the connecting part 202 form an H-shaped structure as a whole.

[0004] As a near-net shape continuous casting product, beam blank is undoubtedly the best blank for producing H-shaped casting blank, and rolling H-shaped casting blank from continuous casting beam blank has the advantages of low energy consumption, fewer processes, high material yield and low cost. However, due to the complex cross-sectional shape of H-shaped casting blank and the irregular center liquid core, compared with simple geometric casting blank, various quality defects are more likely to occur, and conventional electromagnetic stirrers suitable for square casting blank or round casting blank cannot be applied to H-shaped casting blank, so H-shaped casting blank continuous casting machine is basically not equipped with electromagnetic stirrer, resulting in obvious internal loose structure, cracks and segregation in H-shaped casting blank.

[0005] The patent application with publication number CN113732258A provides a method for reducing the occurrence rate of transverse cracks of micro-alloyed beam blank, which is aimed at the problem of transverse cracks of beam blank caused by thermal stress formed by secondary cooling at the straightening section of traditional beam blank continuous casting machine. The method uses an electromagnetic induction heating device to compensate the temperature of the casting blank before the straightening section, thereby reducing the thermal stress caused by temperature gradient, but this design cannot be used to solve the internal quality problem of H-shaped casting blank. UTILITY MODEL CONTENTS

[0006] The problem to be solved by the utility model is to improve the internal loose structure, cracks and segregation of H-shaped casting blank with complex cross-sectional shape, and to provide an electromagnetic stirrer.

[0007] The utility model provides a technical scheme that is adopted to solve the above technical problems: an electromagnetic stirrer, including first core (1), corresponding coil structure that is wound on first core (1),

[0008] From the height direction of electromagnetic stirrer, first core (1) forms annular structure with opening (1A), and the groove surrounded by first core (1) is T-shaped groove (1S).

[0009] When the coil structure is electrified, N-pole and S-pole that are arranged towards each other are formed on first core (1).

[0010] According to the above technical scheme of the utility model, the T-shaped groove formed can accommodate the wing part of the H-shaped casting blank, and the connecting part of the H-shaped casting blank can pass through the opening. By forming N-pole and S-pole that are arranged towards each other on the first core, the un-solidified metal melt of the wing part of the H-shaped casting blank is stirred, so that the temperature of the un-solidified metal melt inside the wing part is relatively uniform, and the flow of the un-solidified part of the liquid in the casting blank is promoted by stirring. When the part of the wing part close to the outside solidifies, the inside un-solidified part is supplemented with liquid, so that there is enough liquid to participate in the solidification process, and the problems of loose internal organization and cracks caused by uneven solidification area in the prior art are minimized.

[0011] Further, the first core (1) includes first connecting section (11), second connecting section (12), third connecting section (13), fourth connecting section (14) and fifth connecting section (15) connected in sequence.

[0012] The first connecting section (11) and the fifth connecting section (15) form the opening (1A) of the first core (1).

[0013] The third connecting section (13) extends from the second connecting section (12) to the fourth connecting section (14), and the gap between the first connecting section (11) and the fifth connecting section (15) is smaller than the gap between the second connecting section (12) and the fourth connecting section (14), so that the first core (1) surrounds the T-shaped groove (1S).

[0014] Through the above-mentioned connecting sections connected in sequence, a structure for accommodating the wing part of the casting blank is surrounded.

[0015] Preferably, the connection between the second connecting section (12) and the third connecting section (13) and the connection between the third connecting section (13) and the fourth connecting section (14) are detachable connections.

[0016] According to the above preferred technical scheme of the utility model, for the casting blank with different width (i.e. the size along the direction perpendicular to the connecting part of the casting blank), the third connecting section with different size can be replaced through the above detachable connection mode, so that the electromagnetic stirring of the casting blank with corresponding wing width is adapted.

[0017] Preferably, the extension direction of the second connecting section (12) and the extension direction of the fourth connecting section (14) are both the first direction (L1), and the extension direction of the third connecting section (13) is the second direction (L2), and the first direction (L1) and the second direction (L2) are perpendicular to each other.

[0018] Through the above-mentioned sequentially connected connecting sections, a structure for accommodating the wing part of the casting blank is formed, and the shape of the wing part of the casting blank is adapted.

[0019] Preferably, the third connecting section (13) is a U-shaped structure, the extension direction of the bottom edge of the U-shaped structure is the first direction (L1), the two end faces of the U-shaped structure are respectively connected with the second connecting section (12) and the fourth connecting section (14), and the inner surface of the U-shaped structure is flush with the corresponding surface of the second connecting section (12) and the corresponding surface of the fourth connecting section (14).

[0020] According to the above preferred technical scheme of the utility model, the two end faces of the U-shaped structure are respectively connected with the second connecting section and the fourth connecting section, so that the third connecting section does not occupy the space of the T-shaped groove as much as possible, and the third connecting section connects the second connecting section and the fourth connecting section, and sequentially connects between the connecting sections.

[0021] Preferably, the materials of the first connecting section (11), the second connecting section (12), the fourth connecting section (14) and the fifth connecting section (15) are all the first material, the material of the third connecting section (13) is a combination of the first material and the second material, the first material is silicon steel or electrical steel, and the second material is carbon structural steel or stainless steel.

[0022] According to the above preferred technical scheme of the utility model, the combination of silicon steel / electrical steel and stainless steel / carbon structural steel is used, the stainless steel / carbon structural steel can reduce the magnetic hysteresis loss of the electromagnetic stirrer and reduce the heating of the electromagnetic stirrer.

[0023] Further, the coil structure comprises a first coil (21), a second coil (22), a third coil (23), a fourth coil (24), a fifth coil (25) and a sixth coil (26); the power supply end of the first coil (21) and the power supply end of the fourth coil (24) are both first power supply ends (401), the power supply end of the second coil (22) and the power supply end of the fifth coil (25) are both second power supply ends (402), and the power supply end of the third coil (23) and the power supply end of the sixth coil (26) are both third power supply ends (403); the first power supply end (401), the second power supply end (402) and the third power supply end (403) correspond to the A-phase output end, the B-phase output end and the C-phase output end of a three-phase alternating current power supply (40) respectively.

[0024] The coil structure can have the following arrangement forms:

[0025] In one form, the first coil (21) is arranged on the first connecting section (11), the second coil (22) and the third coil (23) are arranged on the second connecting section (12), the fourth coil (24) and the fifth coil (25) are arranged on the fourth connecting section (14), and the sixth coil (26) is arranged on the fifth connecting section (15); or

[0026] In another form, the first coil (21) is arranged on the first connecting section (11), the second coil (22) is arranged at a first connecting position, the third coil (23) is arranged on the second connecting section (12), the fourth coil (24) is arranged on the fourth connecting section (14), the fifth coil (25) is arranged at a second connecting position, and the sixth coil (26) is arranged on the fifth connecting section (15); the first connecting position is the connecting position of the first connecting section (11) and the second connecting section (12), and the second connecting position is the connecting position of the fourth connecting section (14) and the fifth connecting section (15).

[0027] According to the above technical scheme, the arrangement of each coil in the coil structure on the connecting section is realized, and the required magnetic field structure form is realized.

[0028] In the preferred technical scheme, the first coil (21) and the fourth coil (24) are connected in series or in parallel with each other in the first sub-circuit structure; the second coil (22) and the fifth coil (25) are connected in series or in parallel with each other in the second sub-circuit structure; the third coil (23) and the sixth coil (26) are connected in series or in parallel with each other in the third sub-circuit structure; one end of the first sub-circuit structure, one end of the second sub-circuit structure and one end of the third sub-circuit structure are connected with the first power supply end (401), the second power supply end (402) and the third power supply end (403) respectively; the other end of the first sub-circuit structure, the other end of the second sub-circuit structure and the other end of the third sub-circuit structure are connected with each other.

[0029] In one connection mode, the other end of the first sub-circuit structure, the other end of the second sub-circuit structure and the other end of the third sub-circuit structure are connected with each other; in another connection mode, the other end of the first sub-circuit structure, the other end of the second sub-circuit structure and the other end of the third sub-circuit structure are connected with each other and then grounded.

[0030] According to the above technical scheme of the utility model, the power supply of each coil in the coil structure can be realized.

[0031] Further, the inner wall of the first iron core (1) is provided with a through slot (28) for allowing the corresponding coil of the coil structure to pass through.

[0032] According to the above technical scheme of the utility model, the coil structure can pass through the through slot, so that sufficient accommodation space can be formed on the inner side of the first iron core for accommodating the wing part of the cast blank.

[0033] Further, the electromagnetic stirrer further comprises a base (4) for mounting the first iron core (1), and the base (4) is provided with an H-shaped through hole (41) which is adapted to the shape of the cast blank (20).

[0034] According to the above technical scheme of the utility model, the first iron core is mounted on the base, and the H-shaped through hole allows the cast blank to pass through, without interfering with the production of the cast blank.

[0035] Further, the cast blank for cooperating with the electromagnetic stirrer is an H-shaped cast blank formed by two wing parts (201) and a connecting part (202) connected between the two wing parts (201), the electromagnetic stirrer comprises two first iron cores (1) respectively corresponding to the two wing parts (201), and the base (4) is provided with a spacing adjustment structure for adjusting the spacing between the two first iron cores (1).

[0036] According to the technical scheme of the utility model, for the casting blank with different lengths of connecting portions, the interval between the two first iron cores can be adjusted by the interval adjusting structure, so that the two first iron cores can be used to realize the surrounding of the two wing portions of the casting blank, and the electromagnetic stirring of the wing portions is facilitated.

[0037] Further, the casting blank used in cooperation with the electromagnetic stirrer is an H-shaped casting blank formed by two wing portions (201) and a connecting portion (202) connected between the two wing portions (201), or a T-shaped casting blank formed by a wing portion (201) and a connecting portion (202) connected together; the first iron core (1) is arranged correspondingly to the wing portion (201) of the casting blank (20).

[0038] When the electromagnetic stirrer cooperates with the casting blank (20), the first iron core (1) is arranged outside the corresponding wing portion (201) of the casting blank (20).

[0039] According to the technical scheme of the utility model, the two first iron cores can be arranged outside the two wing portions of the casting blank correspondingly, so that the electromagnetic stirring of the two wing portions is facilitated.

[0040] According to the same utility model concept, the utility model also provides an electromagnetic stirring system for a casting blank, which comprises a crystallizer, and the crystallizer has a crystallizer outer sleeve (301) arranged outside the casting blank (20), characterized in that the electromagnetic stirrer as described above is further comprised.

[0041] One form is that in the extension direction of the channel of the casting blank (20), the distance between the position of the first iron core (1) of the electromagnetic stirrer and the position of the crystallizer outer sleeve (301) is in the range of (0, d1], and d1 is a preset distance.

[0042] The other form is that the first iron core (1) of the electromagnetic stirrer is arranged outside the crystallizer outer sleeve (301).

[0043] According to the technical scheme of the utility model, since the liquid core ratio of the crystallizer is high, in the above two forms, the distance between the position of the first iron core and the position of the crystallizer outer sleeve in the extension direction of the channel of the casting blank is 0 or not more than d1, so that the stirring of the non-solidified liquid steel of the wing portion of the casting blank is realized as much as possible.

[0044] Compared with the prior art, the utility model has the following obvious and substantial features and advantages:

[0045] 1. The electromagnetic stirrer suitable for H-billet (i.e. special-shaped billet) can improve the metallurgical quality of H-billet and fills the blank of electromagnetic stirring metallurgical equipment for H-billet.

[0046] 2. The electromagnetic stirrer comprises a first iron core, and the second connecting section and the third connecting section of the first iron core and the third connecting section and the fourth connecting section are detachably connected, and different sizes of the third connecting section can be replaced to adapt to the cross-sectional shape of H-shaped steel of different sizes.

[0047] 3. The first iron core of the electromagnetic stirrer is arranged around the wing part of the H-billet, adapts to the cross-sectional shape of the wing part of the H-billet, and significantly improves the electromagnetic stirring efficiency of the electromagnetic stirrer.

[0048] 4. The electromagnetic stirrer suitable for H-billet has reasonable structure design and wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0050] Figure 1-1 is a schematic view of the three-dimensional structure of the prior art H-billet;

[0051] Figure 1-2 is a top view of the prior art T-billet;

[0052] Figure 2 is a schematic view of the three-dimensional structure of an inductor in the electromagnetic stirrer of the embodiment 1 of the present application;

[0053] Figure 3 is a schematic view of the three-dimensional structure of two inductors in the electromagnetic stirrer of the embodiment 1 of the present application, wherein the coil structure and the through slot opened in the inner wall of the iron core are not shown;

[0054] Figure 4 is a top view of two inductors in the electromagnetic stirrer of the embodiment 1 of the present application;

[0055] Figure 5 is a schematic view of the liquid stirring direction formed by an inductor in the electromagnetic stirrer of the embodiment 1 of the present application and the wing part of the H-billet, wherein the coil structure and the through slot opened in the inner wall of the iron core are not shown;

[0056] Figure 6 is a top view of the base of the embodiment 1 of the present application;

[0057] Figure 7 Is the position relation schematic view of the electromagnetic stirrer and the crystallizer jacket of the H-shaped casting blank and the electromagnetic stirring system in the embodiment 1 of the utility model;

[0058] Figure 8-1 It is a kind of circuit connection structure schematic view of each coil and three-phase ac power supply in the embodiment 1 of the utility model;

[0059] Figure 8-2 It is another kind of circuit connection structure schematic view of each coil and three-phase ac power supply in the embodiment 1 of the utility model;

[0060] Figures 9-1 to 9-8 It is the schematic view of N-pole and S-pole formed when one inductor in the electromagnetic stirrer of the embodiment 1 of the utility model is in eight different states respectively;

[0061] Figures 10-1 to 10-3 It is the magnetic field schematic view formed when one inductor in the electromagnetic stirrer of the embodiment 1 of the utility model is in three different states respectively;

[0062] Figure 11 It is the arrangement schematic view of each coil on the first iron core in the coil structure of the embodiment 2 of the utility model;

[0063] In the above drawing:

[0064] First iron core 1;First connecting section 11;Second connecting section 12;Third connecting section 13;Fourth connecting section 14;Fifth connecting section 15;Opening 1A;T-shaped recess 1S;

[0065] First coil 21;Second coil 22;Third coil 23;Fourth coil 24;Fifth coil 25;Sixth coil 26;Terminal box 27;Through slot 28;

[0066] Base 4;H-shaped through hole 41;

[0067] First direction L1;Second direction L2;

[0068] Casting blank 20;Wing part 201;Connecting part 202;Accommodating groove 20S;

[0069] Crystallizer jacket 301;

[0070] Three-phase ac power supply 40;First power supply end 401;Second power supply end 402;Third power supply end 403. DETAILED DESCRIPTION

[0071] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0072] Example 1

[0073] This embodiment 1 provides an electromagnetic stirrer, including a first iron core 1 and a coil structure correspondingly wound on the first iron core 1;

[0074] Viewed from the height of the electromagnetic stirrer, the first iron core 1 forms an annular structure with an opening 1A, and the groove formed by the first iron core 1 is a T-shaped groove 1S.

[0075] When the coil structure is energized, N poles and S poles facing each other are formed on the first iron core 1. The number of N poles and the number of S poles formed can be one.

[0076] like Figures 2 to 5 As shown, the first iron core 1 includes a first connecting segment 11, a second connecting segment 12, a third connecting segment 13, a fourth connecting segment 14, and a fifth connecting segment 15 connected in sequence.

[0077] An opening 1A is formed between the first connecting segment 11 and the fifth connecting segment 15 in the first iron core 1;

[0078] The third connecting segment 13 extends from the second connecting segment 12 to the fourth connecting segment 14. The gap between the first connecting segment 11 and the fifth connecting segment 15 is smaller than the gap between the second connecting segment 12 and the fourth connecting segment 14, thereby forming a T-shaped groove 1S around the first iron core 1. As the phase of the electrical signals (e.g., current signals) of the first power supply terminal 401, the second power supply terminal 402, and the third power supply terminal 403 changes (e.g., the phase change of the electrical signals of the A-phase output terminal, B-phase output terminal, and C-phase output terminal of the three-phase AC power supply 40), after the first coil 21, the second coil 22, ..., the sixth coil 26 are energized, within the area enclosed by the first connecting segment 11, the second connecting segment 12, the third connecting segment 13, the fourth connecting segment 14, and the fifth connecting segment 15, the position of the N pole rotates clockwise (or counterclockwise), and the position of the S pole rotates in the same direction as the rotation of the N pole, and the positions of the N pole and the S pole always remain relative to each other.

[0079] The connection between the second connecting section 12 and the third connecting section 13, and the connection between the third connecting section 13 and the fourth connecting section 14 can be detachable connection, and the specific structure can be that the two end faces of the third connecting section 13 are provided with through holes extending in the first direction, and the positions corresponding to the through holes of the third connecting section 13 of the second connecting section 12 and the fourth connecting section 14 are provided with mounting grooves, for example, the bolt passes through the through hole of the third connecting section 13 and then extends into the corresponding mounting groove of the second connecting section 12 or the fourth connecting section 14, so as to realize detachable connection. Alternatively, the first connecting section 11, the second connecting section 12, the third connecting section 13, the fourth connecting section 14 and the fifth connecting section 15 form an integral structure.

[0080] Preferably, the extension direction of the second connecting section 12 and the extension direction of the fourth connecting section 14 are both the first direction L1, and the extension direction of the third connecting section 13 is the second direction L2, and the first direction L1 and the second direction L2 are perpendicular to each other.

[0081] Preferably, the third connecting section 13 is a U-shaped structure, and the extension direction of the bottom edge of the U-shaped structure is the second direction L2. The two end faces of the U-shaped structure are respectively connected with the second connecting section 12 and the fourth connecting section 14, and the inner surface of the U-shaped structure is flush with the corresponding surface of the second connecting section 12 and the corresponding surface of the fourth connecting section 14.

[0082] Preferably, the materials of the first connecting section 11, the second connecting section 12, the fourth connecting section 14 and the fifth connecting section 15 are all the first material, and the material of the third connecting section 13 is a combination of the first material and the second material, the first material is silicon steel or electrical steel, and the second material is carbon structural steel or stainless steel.

[0083] As shown in Figure 2 , Figure 4 , Figure 7 The coil structure includes a first coil 21, a second coil 22, a third coil 23, a fourth coil 24, a fifth coil 25 and a sixth coil 26.

[0084] The power supply end of the first coil 21 and the power supply end of the fourth coil 24 are both first power supply ends 401, the power supply end of the second coil 22 and the power supply end of the fifth coil 25 are both second power supply ends 402, and the power supply end of the third coil 23 and the power supply end of the sixth coil 26 are both third power supply ends 403.

[0085] The first power supply end 401, the second power supply end 402 and the third power supply end 403 correspond to the A-phase output end, the B-phase output end and the C-phase output end of a three-phase alternating current power supply 40 respectively. The adjustment of the frequency and phase of each phase output of the three-phase alternating current power supply 40 is a prior art.

[0086] The first coil 21 is wound on the first connecting section 11, the second coil 22 is wound on the second connecting section 12, the third coil 23 is wound on the second connecting section 12, the fourth coil 24 is wound on the fourth connecting section 14, the fifth coil 25 is wound on the fourth connecting section 14, and the sixth coil 26 is wound on the fifth connecting section 15.

[0087] The first connection point is the connection point of the first connecting segment 11 and the second connecting segment 12, and the second connection point is the connection point of the fourth connecting segment 14 and the fifth connecting segment 15.

[0088] like Figure 8-1 As shown, in one connection method, the first coil 21 and the fourth coil 24 are connected in series in the first sub-circuit structure; the second coil 22 and the fifth coil 25 are connected in series in the second sub-circuit structure; the third coil 23 and the sixth coil 26 are connected in series in the third sub-circuit structure; one end of the first sub-circuit structure, one end of the second sub-circuit structure, and one end of the third sub-circuit structure are respectively connected to the first power supply terminal 401, the second power supply terminal 402, and the third power supply terminal 403; the other ends of the first sub-circuit structure, the other ends of the second sub-circuit structure, and the other ends of the third sub-circuit structure are connected to point P (i.e., forming a star connection), and point P does not need to be grounded.

[0089] like Figure 8-2 Another connection method shown is Figure 8-1 The difference is that the other ends of the first sub-circuit structure, the other ends of the second sub-circuit structure, and the other ends of the third sub-circuit structure are connected to each other and then grounded.

[0090] In other embodiments, the connections between the first coil 21 and the fourth coil 24, the second coil 22 and the fifth coil 25, and the third coil 23 and the sixth coil 26 can also be in parallel. The series and parallel connections of the coils in different sub-circuits are independent of each other. That is, the coils in one sub-circuit can be set to be in series (or parallel), while the coils in other sub-circuits are in parallel (or series).

[0091] In this embodiment, the power supply signals of the first coil 21 and the fourth coil 24 are in phase, the power supply signals of the second coil 22 and the fifth coil 25 are in phase, and the power supply signals of the third coil 23 and the sixth coil 26 are in phase. The power supply signals of the first coil 21, the second coil 22, and the third coil 23 are each 120° out of phase. That is, the initial phases of the power supply signals of the first coil 21, the second coil 22, and the third coil 23 are θ1, θ2, and θ3, respectively, where θ2-θ1=θ3-θ2=120°.

[0092] Figures 9-1 to 9-8Respectively, the N pole and S pole schematic diagram of one inductor in the electromagnetic stirrer of the embodiment 1 of the utility model in eight different states are formed; Figures 10-1 to 10-3 Respectively, the magnetic field schematic diagram of one inductor in the electromagnetic stirrer of the embodiment 1 of the utility model in three different states are formed, namely Figures 10-1 to 10-3 The phase angle of the power supply signal of the first coil 21 is 0 degree, 60 degree and 120 degree respectively.

[0093] As shown in the figure, Figure 2 The first iron core 1 inner wall is provided with through slot 28 for allowing the corresponding coil of the coil structure to pass through. Each coil in the first coil 21 to the sixth coil 26 is provided with a through slot 28, and the part of each coil located on the inner side of the first iron core 1 passes through the through slot 28 along the height direction of the first iron core 1.

[0094] As shown in the figure, Figure 6 The electromagnetic stirrer further comprises a base 4 for mounting the first iron core 1, and the base 4 is provided with an H-shaped through hole 41, and the shape of the H-shaped through hole 41 is adapted to the shape of the cast blank 20.

[0095] Preferably, the cast blank for cooperating with the electromagnetic stirrer is an H-shaped cast blank formed by two wing parts 201 and a connecting part 202 connected between the two wing parts 201, the electromagnetic stirrer comprises two first iron cores 1 corresponding to the two wing parts 201 respectively, and the base 4 is provided with a spacing adjustment structure for adjusting the spacing between the two first iron cores 1.

[0096] The specific form of the spacing adjustment structure is:

[0097] According to the cross-sectional size of the actual cast blank, a plurality of positioning parts (such as positioning grooves or positioning blocks) for cooperating with the outer periphery of the first iron core are arranged on the base 4, and when the electromagnetic stirrer cooperates with the corresponding cast blank, the two first iron cores are limited by the corresponding positioning parts, so as to realize the spacing adjustment between the two first iron cores 1.

[0098] The structure form of the cast blank for cooperating with the electromagnetic stirrer can be:

[0099] (1) As shown in the figure, Figure 1-1 The cast blank is an H-shaped cast blank formed by two wing parts 201 and a connecting part 202 connected between the two wing parts 201;

[0100] (2) As shown in the figure, Figure 1-2 The cast blank is a T-shaped cast blank formed by a wing part 201 and a connecting part 202.

[0101] The first iron core 1 is correspondingly arranged with the wing part 201 of the cast blank 20; when the electromagnetic stirrer cooperates with the cast blank 20, the first iron core 1 is arranged outside the corresponding wing part 201.

[0102] According to the same utility model concept, the utility model also provides a kind of electromagnetic stirring system for casting blank, including crystallizer, the crystallizer has the crystallizer outer sleeve 301 for being arranged at the outside of casting blank 20, further include above-mentioned electromagnetic stirrer, as Figure 7 Shown.

[0103] In the extension direction of the passage of casting blank 20 (the height direction in this embodiment), the distance between the position of the first core 1 of the electromagnetic stirrer and the position of the crystallizer outer sleeve 301 is in the range of [0, d1], and d1 is a preset distance;Or

[0104] The crystallizer outer sleeve 301 can be a copper jacket of the crystallizer.The value range of d1 can be (0, 20 meters], for example, d1 can be 3 meters, 5 meters, 10 meters or 20 meters.I.e.the electromagnetic stirrer can be arranged at the position where the liquid core of the casting blank is not solidified.

[0105] As Figure 7 Shown, in this embodiment, when the first core 1 of the electromagnetic stirrer and the crystallizer outer sleeve 301 are located at the same height position, the crystallizer outer sleeve 301 is sleeved outside the casting blank 20 and has the same shape as the casting blank 20.The casting blank 20 passes through the inside space of the crystallizer outer sleeve 301.The first core 1 is arranged outside the corresponding wing portion of the crystallizer outer sleeve 301.I.e.the crystallizer outer sleeve 301 also has a wing portion, and the first core 1 is arranged outside the corresponding wing portion of the crystallizer outer sleeve 301.

[0106] The included angle between the extension direction of the first connecting section 11 and the extension direction of the second connecting section 12 and the included angle between the extension direction of the fourth connecting section 14 and the extension direction of the fifth connecting section 15 are both in the range of [90°, 120°].

[0107] The surfaces of the first core 1 located on both sides of the groove can be flush with the outer surfaces of the coils accommodated in the groove.

[0108] When the electromagnetic stirrer cooperates with the casting blank 20, and the casting blank is an H-shaped casting blank, each first core 1 is arranged outside the corresponding wing portion 201 of the casting blank 20, and the connecting portion 202 of the casting blank 20 extends from the opening 1A of one first core 1 to the opening 1A of another first core 1.

[0109] The accommodation grooves 20S are surrounded by the two wing portions 201 and the connecting portion 202 of the H-shaped casting blank 20, and the two accommodation grooves 20S are located on both sides of the connecting portion 202.The first connecting section and the fifth connecting section extend into the two accommodation grooves 20S formed by the H-shaped casting blank 20.

[0110] When the electromagnetic stirrer is matched with the casting blank 20, and the casting blank is a T-shaped casting blank, the first iron core 1 is arranged outside the corresponding wing part 201 of the casting blank 20, and the connecting part 202 of the casting blank 20 extends outward at least by the opening 1A of the first iron core 1.

[0111] The second iron core 3 comprises two first plate bodies 31 arranged parallel to each other and towards each other in a first direction, a first extension section 32 connected between the two first plate bodies 31, and the seventh coil 33 is arranged on the first extension section 32 and accommodated in a groove formed by the two first plate bodies 31 and the first extension section 32; the extension direction of the first extension section 32 is the first direction; and the first direction is perpendicular to the surface of the first plate body 31.

[0112] The following further details the embodiment 1 of the utility model.

[0113] The electromagnetic stirrer of the utility model overcomes the deficiency of the conventional electromagnetic stirrer, and is specially used for special-shaped blanks, can improve the electromagnetic stirring efficiency of the electromagnetic stirrer, and can ensure the stirring efficiency while improving the stirring efficiency by combining different third connecting sections, thereby being applicable to special-shaped blanks with different cross-sectional sizes, i.e. improving the magnetic field stirring efficiency and improving the versatility of the electromagnetic stirrer. The utility model can make the electromagnetic field penetrate the liquid core with high efficiency, and improve the work efficiency of the electromagnetic field driving the liquid core to move. In the embodiment, the special-shaped blank refers to an H-shaped blank, a T-shaped blank and an I-shaped steel.

[0114] An electromagnetic stirrer suitable for special-shaped blanks comprises two electromagnetic inductors. Each inductor comprises a first iron core and a coil structure arranged on the first iron core. The two electromagnetic inductors can be made into rotational symmetry or different structures according to actual needs.

[0115] Each electromagnetic inductor is provided with a terminal box 27 and water inlet and outlet (cooling channel can be arranged in the coil inner cavity along the axis direction of each coil) to facilitate the connection of the power line and the cooling water line. The third connecting section 13 can be of multiple models (with different lengths in the second direction), but the interface with the second connecting section 12 / fourth connecting section 14 can be uniform, and different third connecting sections can be selected to adapt to different cross sections of the cast slab on site. The electromagnetic stirrers are arranged around the periphery of the continuous casting slab and adapt to the cross-sectional shape of the shaped blank, and can be arranged between two pairs of support rollers. The electromagnetic stirrers can be fixed using a platform (such as the base 4) or the existing structure of the continuous casting machine. The support rollers are the contents of the prior art. The third connecting section 2 and the second connecting section 12 / fourth connecting section 14 are connected in a detachable manner using fasteners or quick connectors. The connection mode can use screws, bolts or stud fastening. The winding of each coil can be wound using short-pitch winding or clem winding. The winding of the coil is the content of the prior art. In order to facilitate the arrangement of the winding, the coil can use flat wire winding. In order to further stabilize the excellent heat dissipation performance, the coil can use copper pipe winding.

[0116] The material of the third connecting section is silicon steel sheet or other magnetic conductive material, which functions to conduct the magnetic circuit between the second connecting section and the third connecting section. The third connecting section 2 can use a combination of silicon steel and carbon structural steel, or a combination of electrical steel and stainless steel. Stainless steel can reduce the magnetic hysteresis loss of the electromagnetic stirrer, stabilize the heating of the electromagnetic stirrer, and ensure the heat dissipation performance.

[0117] The electromagnetic stirrer can be installed on the periphery of the copper sleeve of the crystallizer of the shaped blank continuous casting machine. The liquid core ratio is high at the crystallizer, and the electromagnetic stirrer can stir the molten steel as much as possible. The electromagnetic stirrer can be controlled electrically alone, and the direction of the rotating magnetic field can be changed by adjusting the electrical parameters. For example, the electromagnetic stirrer is installed in the secondary cooling section of the shaped blank continuous casting machine, and the specific installation position is in the middle space between the two pairs of support rollers of the shaped blank continuous casting machine. The electromagnetic stirrer is fixed on the dedicated base of the continuous casting machine. The material of the core can be selected from electrical steel or silicon steel, and the material of the coil can be selected from pure copper.

[0118] As Figure 4 , Figure 5 , Figures 9-1 to 9-8 , Figures 10-1 to 10-3 , each electromagnetic stirrer generates a frequency-adjustable rotating magnetic field in the same direction or in the opposite direction. The rotating magnetic field passes through the main liquid core position of the shaped blank, induces current in the metal liquid, and drives the metal liquid to move under the force in the magnetic field, thereby improving the quality of the cast slab of the shaped blank.

[0119] Example 2

[0120] As Figure 11As shown, the difference between the embodiment 2 and the embodiment 1 is that the second coil 22 is arranged outside the first connection, the fifth coil 25 is arranged outside the second connection, the first connection is the connection between the first connection segment 11 and the second connection segment 12, and the second connection is the connection between the fourth connection segment 14 and the fifth connection segment 15.

[0121] The power supply and the formed magnetic pole of the coil structure of the embodiment 2 are similar to those of the embodiment 1, and details are not repeated here.

[0122] It should be noted that each of the embodiments in the specification adopts a progressive manner for description, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments can be referred to.

[0123] The above describes the embodiments of the utility model in detail, but the content described is only the preferred embodiment of the utility model, and cannot be considered as limiting the scope of the utility model. Any equivalent change and improvement within the scope of the utility model should still belong to the scope of the utility model. After reading the utility model, the modification of various equivalent forms of the utility model by the person skilled in the art falls within the scope defined by the claims attached to the application. In the case of no conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

Claims

1. An electromagnetic stirrer, characterized in that: It includes a first iron core (1) and a coil structure correspondingly wound on the first iron core (1); Viewed from the height of the electromagnetic stirrer, the first iron core (1) forms an annular structure with an opening (1A), and the groove formed by the first iron core (1) is a T-shaped groove (1S). When the coil structure is energized, N poles and S poles facing each other are formed on the first iron core (1).

2. The electromagnetic stirrer according to claim 1, characterized in that: The first iron core (1) includes a first connecting segment (11), a second connecting segment (12), a third connecting segment (13), a fourth connecting segment (14), and a fifth connecting segment (15) connected in sequence. An opening (1A) of the first iron core (1) is formed between the first connecting segment (11) and the fifth connecting segment (15). The third connecting segment (13) extends from the second connecting segment (12) to the fourth connecting segment (14). The gap between the first connecting segment (11) and the fifth connecting segment (15) is smaller than the gap between the second connecting segment (12) and the fourth connecting segment (14), so that the first iron core (1) forms a T-shaped groove (1S).

3. The electromagnetic stirrer according to claim 2, characterized in that: The connection between the second connecting segment (12) and the third connecting segment (13), and the connection between the third connecting segment (13) and the fourth connecting segment (14) are both detachable connections.

4. The electromagnetic stirrer according to claim 2, characterized in that: The extension direction of the second connecting segment (12) and the extension direction of the fourth connecting segment (14) are both the first direction (L1), and the extension direction of the third connecting segment (13) is the second direction (L2). The first direction (L1) and the second direction (L2) are perpendicular to each other. The third connecting segment (13) is a U-shaped structure. The extension direction of the bottom edge of the U-shaped structure is the second direction (L2). The two end faces of the U-shaped structure are respectively connected to the second connecting segment (12) and the fourth connecting segment (14). The inner surface of the U-shaped structure is flush with the corresponding surface of the second connecting segment (12) and the corresponding surface of the fourth connecting segment (14).

5. The electromagnetic stirrer according to claim 2, characterized in that: The coil structure includes a first coil (21), a second coil (22), a third coil (23), a fourth coil (24), a fifth coil (25), and a sixth coil (26); The power supply terminals of the first coil (21) and the fourth coil (24) are both first power supply terminals (401), the power supply terminals of the second coil (22) and the fifth coil (25) are both second power supply terminals (402), and the power supply terminals of the third coil (23) and the sixth coil (26) are both third power supply terminals (403). The first power supply terminal (401), the second power supply terminal (402), and the third power supply terminal (403) correspond to the A-phase output terminal, B-phase output terminal, and C-phase output terminal of the three-phase AC power supply (40), respectively. The first coil (21) is wound on the first connecting section (11), the second coil (22) is wound on the second connecting section (12) or at the first connection, the third coil (23) is wound on the second connecting section (12), the fourth coil (24) is wound on the fourth connecting section (14), the fifth coil (25) is wound on the fourth connecting section (14) or at the second connection, and the sixth coil (26) is wound on the fifth connecting section (15). The first connection point is the connection point of the first connection segment (11) and the second connection segment (12), and the second connection point is the connection point of the fourth connection segment (14) and the fifth connection segment (15).

6. The electromagnetic stirrer according to claim 5, characterized in that: The first coil (21) and the fourth coil (24) are connected in series or in parallel in the first sub-circuit structure; The second coil (22) and the fifth coil (25) are connected in series or in parallel in the second sub-circuit structure; The third coil (23) and the sixth coil (26) are connected in series or in parallel in the third sub-circuit structure; One end of the first sub-circuit structure, one end of the second sub-circuit structure, and one end of the third sub-circuit structure are respectively connected to the first power supply terminal (401), the second power supply terminal (402), and the third power supply terminal (403); The other ends of the first sub-circuit structure, the second sub-circuit structure, and the third sub-circuit structure are interconnected.

7. The electromagnetic stirrer according to any one of claims 1-6, characterized in that: The inner wall of the first iron core (1) is provided with a through slot (28) for the corresponding coil of the coil structure to pass through.

8. The electromagnetic stirrer according to any one of claims 1-6, characterized in that: The electromagnetic stirrer also includes a base (4) for mounting the first iron core (1), and the base (4) has an H-shaped through hole (41) which is adapted to the shape of the billet (20). The billet used to cooperate with the electromagnetic stirrer is an H-shaped billet formed by two wings (201) and a connecting part (202) connecting the two wings (201), or a T-shaped billet formed by connecting the wings (201) and the connecting part (202). The first iron core (1) is provided correspondingly to the wing (201) of the casting billet (20); When the electromagnetic stirrer is used in conjunction with the billet (20), the first iron core (1) is wound around the outside of the corresponding wing (201).

9. The electromagnetic stirrer according to claim 8, characterized in that: The billet used to cooperate with the electromagnetic stirrer is an H-shaped billet. The electromagnetic stirrer includes two first iron cores (1) respectively corresponding to the two wings (201). The base (4) is provided with a spacing adjustment structure for adjusting the spacing between the two first iron cores (1).

10. An electromagnetic stirring system for casting billets, comprising a crystallizer having a crystallizer jacket (301) disposed outside the casting billet (20), characterized in that: It also includes an electromagnetic stirrer as described in any one of claims 1-9; In the extending direction of the billet (20) channel, the distance between the location of the first iron core (1) of the electromagnetic stirrer and the location of the crystallizer jacket (301) ranges from (0, d1], where d1 is a preset distance; or The first iron core (1) of the electromagnetic stirrer is fitted on the outside of the crystallizer outer jacket (301).

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