Inductor and roller type electromagnetic stirring system

Abstract

The utility model provides an inductor and a roller type electromagnetic stirring system. The inductor comprises an iron core and a winding wound on the outer side of the iron core, the iron core comprises a first iron core material layer and a second iron core material layer wound on the outer side of the first iron core material layer, and the first iron core material layer and the second iron core material layer are fixed through a fastener to form the iron core; the magnetic conductivity of the first iron core material layer is larger than that of the sheet-shaped structure.

Description

Technical Field

[0001] This utility model relates to an inductor and a roller-type electromagnetic stirring system, belonging to the technical field of continuous metal casting equipment. Background Technology

[0002] The roller-type electromagnetic stirring system is located in the secondary cooling zone (referred to as the secondary cooling zone). In this system, roller sleeves are installed on both sides of the billet. The rotation of these sleeves propels the billet forward in the direction of travel. Stirring in the secondary cooling zone expands the equiaxed grain region, improves center segregation, and reduces center porosity and cracks. The main component of the roller-type electromagnetic stirring system is the inductor (electromagnetic inductor) located inside the roller sleeve. The components that generate the magnetic field are the coil and the iron core. The iron core acts as a guide for the magnetic flux (magnetic lines of force), and the path through which the magnetic lines of force converge is called the magnetic circuit. Constructing a magnetic circuit using ferromagnetic materials is similar to using highly conductive materials (such as aluminum or copper) to guide the current in an electrical circuit. When current flows through the coil, a magnetic field is generated around it, thereby stirring the molten steel within the billet.

[0003] In the patent application CN200710085940.5, entitled "Electromagnetic Stirring Roller in the Second Cooling Zone of a High Magnetic Field Slab," a magnetic shielding structure is set on the outside of the coil. This magnetic shielding structure is an arc-shaped structure with an opening, meaning the area facing the opening of the arc-shaped structure serves as the magnetic field's active area. This prevents the magnetic field from leaking out from the direction where no work is being done, thus greatly increasing the magnetic field strength on the working surface and enhancing the electromagnetic stirring effect. However, since the magnetic shielding structure is generally made of metal, eddy currents are generated under the action of an alternating magnetic field, leading to additional energy loss, reducing the winding efficiency, and consequently affecting the electromagnetic stirring effect. Utility Model Content

[0004] This invention addresses the problem that in existing technologies, magnetic shielding structures made of metallic materials generate eddy currents under alternating magnetic fields, leading to additional energy loss, reduced winding efficiency, and consequently affecting electromagnetic stirring performance. The invention provides a sensor for this purpose.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a sensor, including an iron core (11) and a winding (12) wound around the outside of the iron core (11). The iron core (11) includes a first iron core material layer (115) and a second iron core material layer (111) wound around the outside of the first iron core material layer (115). The first iron core material layer (115) and the second iron core material layer (111) are fixed by fasteners (112) to form the iron core (11).

[0006] The hardness of the first core material layer (115) is less than that of the second core material layer (111), and the permeability of the first core material layer (115) is greater than that of the second core material layer (111).

[0007] With the above arrangement, a second core material layer with higher hardness and lower magnetic permeability is wound around the outside of a first core material layer with lower hardness and higher magnetic permeability. This not only ensures the overall stability of the core structure but also improves the overall magnetic permeability of the core. Furthermore, fasteners are used to achieve a fixed connection between the first and second core material layers.

[0008] In the above technical solution, the second core material layer (111) forms a ring structure surrounding the first core material layer (115).

[0009] In the above technical solution, the sensor also includes a magnetic shielding structure (13) disposed outside the coil.

[0010] On a cross section perpendicular to the axial direction of the iron core (11), the magnetic shielding structure (13) is an arc-shaped structure forming an opening.

[0011] In the above technical solution, the second core material layer (111) is a U-shaped structure that is partially wrapped around the outside of the first core material layer (115). The opening of the U-shaped structure faces the opening of the magnetic shielding structure (13), so that the second core material layer (111) is set close to the opening of the magnetic shielding structure (13); the portion of the first core material layer (115) that is not wrapped by the second core material layer (111) forms the outer wall of the core (11).

[0012] With the above settings, the second core material layer accounts for a larger proportion of the entire core, and the second core material layer with greater magnetic permeability is placed closer to the opening of the magnetic shielding structure. This means that when the electromagnetic stirring system is working, it can be placed closer to the billet, resulting in a better stirring effect on the billet.

[0013] In the above technical solution, the second core material layer (111) is formed by stacked sheet structures (111A) in the radial direction, and each sheet structure (111A) is fixed to the first core material layer (115) by fasteners (112).

[0014] In the above technical solution, the material of the first core material layer (115) is an amorphous alloy; the material of the second core material layer (111) is silicon steel.

[0015] In the above technical solution, the fastener (112) is a pin.

[0016] In the above technical solution, the iron core (11) is provided with a first mounting plate (113) at both ends in the radial direction, and a second mounting plate (114) is provided at both ends in the axial direction; the iron core (11) is sandwiched between the two first mounting plates (113) and between the two second mounting plates (114);

[0017] The iron core (11) is fixedly connected to the first mounting plate (113) and to the second mounting plate (114).

[0018] By setting a first mounting plate at both ends in the radial direction of the iron core and a second mounting plate at both ends in the axial direction of the iron core, the overall structure of the iron core is made more stable.

[0019] In the above technical solution, the iron core (11) is fixed to the first mounting plate (113) by the fastener (112); the iron core (11) is welded to the second mounting plate (114).

[0020] In the above technical solution, the material of the first mounting plate (113) is carbon steel, and the material of the second mounting plate (114) is stainless steel.

[0021] With the above configuration, the first mounting plate is made of carbon steel, which, due to its magnetic permeability, will not affect the overall magnetic field strength. The second mounting plate is made of stainless steel, thereby reducing the risk of rust and overheating at the ends of the iron core.

[0022] Based on the same utility model concept, this utility model also provides a roller electromagnetic stirring system, including a base (10) and a roller sleeve (3) that rotates relative to the base (10), wherein the above-mentioned sensor (1) is provided on the inner side of the roller sleeve (3); the sensor (1) is fixedly connected to the base (10). Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the roller electromagnetic stirring system of Embodiment 1 of this utility model;

[0025] Figure 2 for Figure 1 A three-dimensional structural diagram of the sensor structure, showing only one end plate and not the magnetic shielding structure;

[0026] Figure 3 for Figure 2 A frontal view diagram;

[0027] Figure 4 for Figure 3 A cross-sectional view (AA) showing that the fasteners have been removed;

[0028] Figure 5 for Figure 4 A schematic diagram of the second core material layer formed by stacked silicon steel sheets;

[0029] Figure 6 for Figure 1 A side view of the central magnetic shielding structure;

[0030] Figure 7 for Figure 1 A side view of the sensor, showing the magnetic shielding structure, but not the second mounting plate;

[0031] Figure 8 for Figure 1 Enlarged schematic diagram of the groove structure in section B;

[0032] Figure 9 This is a side view of the sensor in Embodiment 2 of the present invention, where the end plate is not shown.

[0033] In the above figures: sensor 1; iron core 11; pin 112; second iron core material layer 111; silicon steel sheet 111A; fastener 112; first mounting plate 113; second mounting plate 114; first iron core material layer 115; winding 12; magnetic shielding structure 13; fastener mounting hole 14; bearing 2; roller sleeve 3; end connector 4; fastener 41; groove 5; groove opening 51; turning structure 52; first section of groove 5A; second section of groove 5B; cooling water pipe 61; junction box 62; base 10. Detailed Implementation

[0034] 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.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0036] Example 1

[0037] Figure 1 This is a schematic diagram of the roller-type electromagnetic stirring system according to Embodiment 1 of this utility model. It includes a base 10, an inductor 1 fixedly connected to the base 10, a bearing 2 for adjustment, and a roller sleeve 3. The roller sleeve 3 rotates relative to the base 10. The inductor 1 is located inside the roller sleeve 3. The inductor 1 includes a cylindrical iron core 11 and a winding 12 wound around the outside of the iron core 11. The base 10 is equipped with a junction box 62 and is also connected to a cooling water pipe 61. The cooling water in the cooling water pipe 61 is used to cool the winding 12. During operation, the roller sleeve 3 and the end connector 4 rotate together, while the base 10 and the inductor 1 remain fixed. The wiring of the inductor 1 and the cooling water pipe 61 extend into the inside of the roller sleeve 3 through the through-hole of the end connector 4. The roller-type electromagnetic stirring system is located in the secondary cooling zone, and the cast billet is placed between the roller sleeves on both sides.

[0038] The iron core 11 includes a first iron core material layer 115 and a second iron core material layer 111 surrounding the outside of the first iron core material layer 115. The second iron core material layer 111 is formed by stacked sheet-like structures in the radial direction. Each sheet-like structure is fixed to the first iron core material layer 115 by fasteners 112, thereby forming the iron core 11.

[0039] The hardness of the first core material layer 115 is less than that of the second core material layer 111, and the magnetic permeability of the first core material layer 115 is greater than that of the sheet-like structure. The second core material layer 111 forms a ring-shaped structure surrounding the first core material layer 115. The sensor also includes a magnetic shielding structure 13 disposed outside the coil; in a cross-section perpendicular to the axial direction of the core 11, the magnetic shielding structure 13 is an arc-shaped structure forming an opening, such as... Figure 6 , Figure 7 As shown. The first core material layer 115 is made of an amorphous alloy; the second core material layer 111 is made of silicon steel. The fastener 112 is a pin. A billet channel (not shown in the figure) is formed near the roller sleeve 3 in the roller electromagnetic stirring system. The opening of the magnetic shielding structure 13 is set towards the billet channel, so that the magnetic lines of force generated by the inductor 1 act on the billet in the billet channel.

[0040] The iron core 11 has a first mounting plate 113 at both ends in the radial direction and a second mounting plate 114 at both ends in the axial direction; the iron core 11 is clamped between the two first mounting plates 113 and between the two second mounting plates 114; the iron core 11 is fixedly connected to the first mounting plate 113 and to the second mounting plate 114.

[0041] The iron core 11 is fixed to the first mounting plate 113 by the fastener 112; the iron core 11 is welded to the second mounting plate 114. The first mounting plate 113 is made of carbon steel, and the second mounting plate 114 is made of stainless steel. The fastener 112 is installed in the fastener mounting hole 14. The fastener mounting hole 14 passes through the first mounting plate 113, the second iron core material layer 111, the first iron core material layer 115, the second iron core material layer 111 on one side, and the first mounting plate 113 on the other side in a radial direction.

[0042] Based on the same concept, this utility model also provides a roller electromagnetic stirring system, including a base 10 and a roller sleeve 3 that rotates relative to the base 10, wherein a sensor 1 is provided on the inner side of the roller sleeve 3; the sensor 1 is fixedly connected to the base 10.

[0043] In this utility model, one structure is wrapped around the outside of another structure, which can be understood as one structure being wrapped around a part of the outside of another structure, or it can be understood as one structure being wrapped around the entire outside of another structure.

[0044] Traditional cylindrical iron cores without toothed grooves are made of several non-oriented or oriented silicon steel sheets stacked together, which are difficult to manufacture and process, and prone to falling apart. Cylindrical iron cores 11 are generally made of several non-oriented or oriented silicon steel sheets 111 stacked together, such as... Figure 5 As shown. Figure 4 , Figure 5 As shown, in the iron core 11 of this utility model, after the silicon steel sheets 111 are stacked, they are fixed with several pins 112, and first mounting plates 113 (iron core clamping plates) are provided at both ends in the radial direction of the iron core 11, and second mounting plates 114 (iron core end plates) are welded to both ends in the axial direction to increase the stability of the iron core 11. Figures 2-4 As shown. Figure 4 The overlapping direction shown is L2. The first mounting plate 113 is positioned using pins. The silicon steel sheets are threaded together using pins. The first mounting plate 113 is made of carbon steel, and the second mounting plate 114 is made of stainless steel. The permeability of the amorphous alloy 115 is greater than that of the silicon steel sheets. Considering hardness, since the amorphous alloy 115 is softer than the silicon steel sheets, a structure in which the amorphous alloy is wound around the second core material layer 111 is adopted. By using a high-permeability amorphous alloy in the inner layer of the core 11, the magnetic field strength is enhanced; and by using low-hysteresis silicon steel sheets 111 in the outer layer, energy loss is reduced.

[0045] The roller sleeve structure includes a roller sleeve 3 and end connectors 4 (also called roller sleeve end shafts). Each end of the roller sleeve 3 is fixedly connected to an end connector 4, which is connected to the base 10 via a corresponding bearing 2. The roller sleeve 3 can be a hollow cylinder, and the roller surface of the roller sleeve 3 is provided with grooves 5 (also called guide thread grooves). The beneficial effects of the grooves are: 1) Preventing billet adhesion: During continuous casting, high-temperature billets are prone to adhesion to the roller sleeve. The grooves can disrupt the continuity of contact between the billet and the roller sleeve, reduce the adhesion area, reduce the risk of adhesion, and ensure smooth production. 2) Improving cooling effect: When the continuous casting machine cooling system cools the roller sleeve, the grooves increase the contact area between the cooling medium and the roller sleeve, enhance the cooling effect, prevent local overheating, and extend its service life. 3) Increasing friction: When conveying the billet, the grooves can increase the friction between the roller sleeve and the billet, prevent slippage, and ensure the rhythm of continuous casting production and the dimensional accuracy of the billet. Those skilled in the art can design the specific dimensions and depth of the grooves according to factors such as the length and thickness of the roller sleeve and the prevention of crack propagation.

[0046] The outer wall of the roller sleeve 3 has multiple grooves 5, which are arranged sequentially in the axial direction of the roller sleeve 3; the grooves 5 form channels on the outer wall of the roller sleeve 3, such as... Figure 1 As shown. The axial direction of the roller sleeve 3 is parallel to the axial direction of the iron core 11.

[0047] like Figure 8 As shown, in the cross section passing through the axis of the roller sleeve 3, the groove 5 includes a first groove segment 5A, and the width of the first groove segment 5A gradually increases from the end of the first groove segment 5A away from the groove opening 51 to the end near the groove opening 51.

[0048] The groove 5 also includes a second groove section 5B that communicates with the first groove section 5A to form the groove 5; the second groove section 5B is located on the side of the first groove section 5A away from the groove opening 51; the wall of the second groove section 5B is arc-shaped, and the protrusions formed on the wall of the second groove section 5B face away from the groove opening 51. At the position where the first groove section 5A and the second groove section 5B connect, the wall of the groove 5 forms a turning structure 52.

[0049] The relationship between the width WA1 of the first segment 5A of the groove furthest from the groove opening 51 and the width WA2 of the first segment 5A of the groove closest to the groove opening 51 can be set as: WA1 ≤ WA2 × 1 / 2. The relationship between the heights of the first segment 5A of the groove and the second segment 5B of the groove can be set as HA / 2 ≤ HB ≤ HA. HA and HB correspond to the heights of the first segment 5A of the groove and the second segment 5B of the groove, respectively. The first segment 5A of the groove forms a trapezoidal shape.

[0050] The second segment 5B of the groove forms an arc or a semicircle. An arc is a shape composed of a chord and its corresponding arc. Both parts of the circle divided by the chord are arcs. When the arc of the arc is smaller than the semicircle, it is a minor arc arc. When the arc of the arc is larger than the semicircle, it is a major arc arc.

[0051] To prevent the roller sleeve 3 from contacting the sensor 1 during rotation and causing deformation of the roller sleeve 3, a certain gap d1 can be maintained between the roller sleeve 3 and the sensor 1, such as... Figure 9 As shown. Even if the roller sleeve 3 deforms, it can protect the sensor 1 from being damaged by the inner wall of the roller sleeve 3 to the greatest extent, thereby extending the service life of the system. The value of d1 can be in the range of 3mm-5mm.

[0052] When the electromagnetic stirring system is running, the end connector 4 and the roller sleeve 3 move together with the cast billet. Therefore, the fit between the end connector 4 and the inner cavity of the roller sleeve 3 can be a transition fit, and two O-rings (not shown in the figure) can be used for sealing. Figure 6 , Figure 1 As shown. The end connector 4 and the roller sleeve 3 can be secured by 18 fasteners 41 (bolts may be used), as... Figure 5 As shown in the figure, several guiding protrusions (not shown) can be provided on the end face of the end connector 4 that mates with the roller sleeve 3. A guiding limiting groove (not shown) is also designed on the end face of the roller sleeve 3. This effectively prevents the fasteners 41 (e.g., bolts) on the end face from coming out due to deformation of the roller sleeve 3 under stress, thereby reducing the risk of cracking of the end connector 4 due to stress from external forces. If the end connector does not have protrusions, the bolts connecting the roller sleeve and the end connector will come out under stress after the roller sleeve deforms, and will no longer bear the protective force. By providing protrusions, the protrusions can bear the deformation force of the roller sleeve first, and then the bolts bear the force.

[0053] Example 2

[0054] like Figure 9As shown, the difference between Embodiment 2 and Embodiment 1 is that the second core material layer 111 is a U-shaped structure wrapped around a portion of the outer side of the first core material layer 115. The opening of the U-shaped structure faces the opening of the magnetic shielding structure 13, so that the second core material layer 111 is positioned close to (or located at) the opening of the magnetic shielding structure 13. The portion of the first core material layer 115 not wrapped by the second core material layer 111 forms the outer wall of the core 11. In this embodiment, the pin may have a cross-shaped structure. The pin has a first pin section and a second pin section that are fixed to each other. That is, the first pin section extends in the L2 direction, and the second pin section extends in a direction perpendicular to both the L2 and L1 directions, so that the first pin section and the second pin section together form a cross-shaped structure. The first pin section in the L2 direction fixes the U-shaped structure of the second core material layer 111 and the first core material layer 115 contained by the U-shaped structure. The second section of the pin securely connects the first core material layer 115 and the portion of the first core material layer 115 located on one side of the first core material layer 115 (i.e., the portion of the U-shaped structure located at the bottom of the slot). Since the winding 12 is wound around the outside of the first core material layer 115 and the second core material layer 111, the overall stability of the core structure can be improved.

[0055] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0056] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model. After reading this utility model, any modifications of various equivalent forms to this utility model by those skilled in the art fall within the scope defined by the appended claims. Where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

Claims

1. A sensor, comprising an iron core (11) and a winding (12) wound around the outside of the iron core (11), characterized in that: The core (11) includes a first core material layer (115) and a second core material layer (111) wrapped around the outside of the first core material layer (115). The first core material layer (115) and the second core material layer (111) are fixed by fasteners (112) to form the core (11). The hardness of the first core material layer (115) is less than that of the second core material layer (111), and the permeability of the first core material layer (115) is greater than that of the second core material layer (111).

2. The sensor according to claim 1, characterized in that: The second core material layer (111) forms a ring structure around the first core material layer (115).

3. The sensor according to claim 1, characterized in that: The sensor also includes a magnetic shielding structure (13) disposed outside the coil. On a cross section perpendicular to the axial direction of the iron core (11), the magnetic shielding structure (13) is an arc-shaped structure forming an opening.

4. The sensor according to claim 3, characterized in that: The second core material layer (111) is a U-shaped structure that is partially wrapped around the outside of the first core material layer (115). The opening of the U-shaped structure faces the opening of the magnetic shielding structure (13), so that the second core material layer (111) is positioned close to the opening of the magnetic shielding structure (13). The portion of the first core material layer (115) that is not wrapped by the second core material layer (111) forms the outer wall of the core (11).

5. The sensor according to claim 1, characterized in that: The second core material layer (111) is formed by stacked sheet structures (111A) in the radial direction, and each sheet structure (111A) is fixed to the first core material layer (115) by fasteners (112).

6. The sensor according to claim 1, characterized in that: The first core material layer (115) is made of an amorphous alloy; the second core material layer (111) is made of silicon steel.

7. The sensor according to any one of claims 1-6, characterized in that: The iron core (11) has a first mounting plate (113) at both ends in the radial direction and a second mounting plate (114) at both ends in the axial direction; the iron core (11) is clamped between the two first mounting plates (113) and between the two second mounting plates (114); the iron core (11) is fixedly connected to the first mounting plate (113) and the second mounting plate (114).

8. The sensor according to claim 7, characterized in that: The iron core (11) is fixed to the first mounting plate (113) by the fastener (112); the iron core (11) is welded to the second mounting plate (114).

9. The sensor according to claim 7, characterized in that: The first mounting plate (113) is made of carbon steel, and the second mounting plate (114) is made of stainless steel.

10. A roller-type electromagnetic stirring system, comprising a base (10) and a roller sleeve (3) rotating relative to the base (10), characterized in that: The inner side of the roller sleeve (3) is provided with a sensor (1) as described in any one of claims 1-9; the sensor (1) is fixedly connected to the base (10).

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