Roller type electromagnetic stirring system

Abstract

The utility model provides a roller type electromagnetic stirring system which comprises a base, a roller sleeve rotating relative to the base and an inductor arranged on the inner side of the roller sleeve, and the inductor is fixedly connected with the base. A plurality of grooves are formed in the outer wall of the roller sleeve and are sequentially formed in the axis direction of the roller sleeve; the groove forms a channel on the outer wall of the roller sleeve; the groove comprises a first groove section and a second groove section; the groove second section is located on the side, away from the groove opening, of the groove first section; the wall surface of the second section of the groove is arc-shaped, and a bulge formed on the wall surface of the second section of the groove faces the direction far away from the opening of the groove; and a turning structure is formed on the wall surface of the groove at the connecting position of the first section of the groove and the second section of the groove.

Description

A roller electromagnetic stirring system Technical Field

[0001] This utility model relates to 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] When the rotating roller sleeve comes into contact with the high-temperature cast billet, the billet material easily adheres to the roller sleeve. To reduce the adhesion area and ensure smooth production, existing technology involves creating grooves on the outer side of the roller sleeve. On a cross-section perpendicular to the roller sleeve's axial direction, the grooves are typically trapezoidal or rectangular in shape. When the rotating roller sleeve contacts the cast billet, the roller sleeve is subjected to pressure from the billet. The corners of the trapezoidal or rectangular grooves are prone to concentrated loads, leading to cracks in the groove walls and ultimately, damage to the roller sleeve. Summary of the Invention

[0004] The problem this invention aims to solve is that in existing roller electromagnetic stirring systems, the roller sleeve is subjected to pressure from the cast billet, and the corners of the trapezoidal or rectangular grooves are prone to concentrated loads, leading to cracks in the groove walls and subsequent damage to the roller sleeve. The invention provides a roller electromagnetic stirring system.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a roller electromagnetic stirring system, including a base (10), a roller sleeve (3) that rotates relative to the base (10), and a sensor (1) disposed inside the roller sleeve (3), wherein the sensor (1) is fixedly connected to the base (10); the outer wall of the roller sleeve (3) is provided with a plurality of grooves (5), and each groove (5) is 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); in the cross section passing through the axis of the roller sleeve (3), the grooves (5) include grooves The first segment (5A); the groove (5) further includes a second segment (5B) of the groove that is interconnected with the first segment (5A) to form the groove (5); the second segment (5B) of the groove is located on the side of the first segment (5A) away from the groove opening (51); the wall of the second segment (5B) of the groove is arc-shaped, and the protrusion formed on the wall of the second segment (5B) of the groove faces away from the groove opening (51); at the position where the first segment (5A) of the groove and the second segment (5B) of the groove are connected, the wall of the groove (5) forms a turning structure (52).

[0006] In existing roller-type electromagnetic stirring systems, the roller sleeves are subjected to pressure from the cast billet, and the corners of the trapezoidal or rectangular grooves are prone to concentrated loads, leading to cracks in the groove walls. According to the above-mentioned design of this invention, the contour of the second arc-shaped wall of the groove is continuous and smooth, without sharp corners, and the geometric shape changes gradually. The smooth arc-shaped wall allows the compressive stress to be distributed more evenly on the groove wall, reducing local stress concentration and lowering the risk of cracking. For grooves with a first groove section in the prior art (e.g., grooves formed only by the first groove section), when the structure of this invention is required, only the second groove section needs to be opened on the bottom surface of the first groove section, thereby effectively utilizing the existing structure and reducing workpiece waste.

[0007] In the above technical solution, the first segment (5A) of the groove is rectangular or trapezoidal in shape.

[0008] In the above technical solution, the wall surface of the first section (5A) of the groove is arc-shaped.

[0009] In the above technical solution, the second segment (5B) of the groove is formed in an arc shape or a semi-circle.

[0010] In the above technical solution, there is a gap between the sensor (1) and the inner wall of the roller sleeve (3).

[0011] With the above settings, a gap is provided between the roller sleeve and the sensor, which maximizes the protection of the sensor from wear and improves the service life and performance of the entire system.

[0012] In the above technical solution, the angle θ between the channel extension direction and the axis of the roller sleeve (3) is 15°≤θ≤75°.

[0013] The above setup facilitates the formation of a downward-sloping channel, allowing the cast billet material that has entered the groove to fall out of the groove.

[0014] In the above technical solution, the width of the first segment (5A) of the groove gradually increases from the end away from the groove opening (51) to the end near the groove opening (51); WA1≤WA2×1 / 2; WA1 and WA2 correspond to the width of the first segment (5A) of the groove away from the groove opening (51) and the width of the first segment (5A) of the groove near the groove opening (51), respectively.

[0015] With the above configuration, the width of the groove gradually increases from the bottom to the opening, making it easier for the casting material that has entered the groove to fall out when the groove is rotated to face downwards.

[0016] In the above technical solution, the roller electromagnetic stirring system includes a base (10), and each end of the roller sleeve (3) is fixedly connected to an end connector (4), and the end connector (4) is connected to the base (10) through a corresponding bearing (2).

[0017] In the above technical solution, the end face of the end connector (4) is fixedly connected to the corresponding end of the roller sleeve (3) by a plurality of fasteners (41) spaced apart in the circumferential direction.

[0018] In the above technical solution, the end face of the end connector (4) is also provided with a protruding structure (42), the protruding structure (42) extends toward the roller sleeve (3) in the axial direction, and the corresponding end of the roller sleeve (3) is provided with a limiting groove that cooperates with the protruding structure (42).

[0019] Without a structure where the protruding structure and the limiting groove cooperate to limit movement, the bolts on the end face may come out due to the deformation of the roller sleeve under stress, causing the end connector to crack under stress. With the above-described design of this invention, the end connector and the roller sleeve are not only connected by fasteners but also limited by the cooperation of the protruding structure and the limiting groove. When the roller sleeve deforms under stress, the protruding structure and the limiting groove can first withstand the deformation force of the roller sleeve, and then the bolts bear the force, effectively reducing the risk of the end connector cracking due to stress.

[0020] In the above technical solution, the protruding structure (42) is disposed between two adjacent fasteners (41) in the circumferential direction.

[0021] In the above technical solution, the end connector (4) extends into the opening at the corresponding end of the roller sleeve (3), and a sealing ring (43) is provided between the outer wall of the end connector (4) and the inner wall of the roller sleeve (3). Attached Figure Description

[0022] 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.

[0023] Figure 1 is a partial cross-sectional view of the roller electromagnetic stirring system of Embodiment 1 of this utility model, obtained by cutting along the axial direction of the roller sleeve.

[0024] Figure 2 is a schematic diagram of the connection between the roller sleeve and the end connector in Figure 1;

[0025] Figure 3 is an enlarged structural diagram of part A in Figure 1 when the groove structure of the prior art is used;

[0026] Figure 4 is an enlarged structural schematic diagram of part A in Figure 1 when the improved groove structure of Embodiment 1 of this utility model is adopted;

[0027] Figure 5 is a side view of the end connector in Figure 1;

[0028] Figure 6 is a schematic diagram of the CC section of Figure 5;

[0029] Figure 7 is a schematic cross-sectional view of DD in Figure 5;

[0030] Figure 8 is an enlarged structural diagram of part B in Figure 2, showing the disassembly of the fasteners;

[0031] Figure 9 is a magnified structural diagram of the LA part in Figure 1;

[0032] Figure 10 is a three-dimensional structural diagram of the sensor in Figure 1, showing only one end plate and not the magnetic shielding structure;

[0033] Figure 11 is a side view of the sensor in Figure 1, showing the magnetic shielding structure;

[0034] Figure 12 is an enlarged structural diagram of part A in Figure 2 when the improved groove structure of Embodiment 2 of this utility model is adopted.

[0035] In the above figures: sensor 1; iron core 11; second iron core material layer 111; fastener 112; first mounting plate 113; second mounting plate 114; first iron core material layer 115; winding 12; bearing 2; roller sleeve 3; first threaded hole 31; end connector 4; fastener 41; protrusion structure 42; sealing ring 43; second threaded hole 44; 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

[0036] 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.

[0037] 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.

[0038] Example 1

[0039] Figure 1 is a schematic diagram of the roller electromagnetic stirring system of Embodiment 1 of this utility model, including 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 disposed inside the roller sleeve 3. The cooling 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 provided 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 electromagnetic stirring system is disposed in the secondary cooling zone, and the billet is disposed between the roller sleeves on both sides.

[0040] As shown in Figure 2, the roller sleeve structure includes a roller sleeve 3 and an end connector 4 (also called a roller sleeve end shaft). 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 its surface has a groove 5 (also called a guide thread groove). The beneficial effects of the groove are: 1) Preventing billet adhesion: During continuous casting, high-temperature billets are prone to adhesion to the roller sleeve. The groove can disrupt the continuity of contact between the billet and the roller sleeve, reducing the adhesion area, lowering the risk of adhesion, and ensuring smooth production. 2) Improving cooling effect: When the continuous casting machine's cooling system cools the roller sleeve, the groove increases the contact area between the cooling medium and the roller sleeve, enhancing the cooling effect, preventing local overheating, and extending its service life. 3) Increasing friction: When conveying the billet, the groove increases the friction between the roller sleeve and the billet, preventing slippage and ensuring 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 groove based on factors such as the length and thickness of the roller sleeve and the need to prevent crack propagation.

[0041] Figure 3 shows a traditional groove structure. This structure has a flat bottom and lacks chamfered corners, making it prone to cracking during processing and severely reducing the service life of the roller sleeve. Figure 4 shows the groove shape of this invention, which features a semi-circular structure at the bottom. This structure transmits force to the arc-shaped structure, effectively preventing cracking during processing. The groove design of this invention fully considers preventing crack propagation, thus improving the service life of the roller sleeve.

[0042] The outer wall of the roller sleeve 3 is provided with a plurality of grooves 5, and each groove 5 is arranged sequentially in the axial direction of the roller sleeve 3; the grooves 5 form a channel on the outer wall of the roller sleeve 3.

[0043] On 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.

[0044] 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.

[0045] 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 (or the end forming the groove opening 51) can be set as: WA1 ≤ WA2 × 1 / 2. The height relationship between 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 height of the first segment 5A of the groove and the height of the second segment 5B of the groove, respectively. The shape formed by the first segment 5A of the groove is trapezoidal.

[0046] 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.

[0047] The angle θ between the channel extension direction and the axis of the roller sleeve 3 is 15°≤θ≤75°.

[0048] As shown in Figures 5-8, the end face of the end connector 4 is fixedly connected to the corresponding end of the roller sleeve 3 by a plurality of fasteners 41 spaced apart in the circumferential direction. The fasteners 41 pass through the second threaded hole 44 opened on the end connector 4 and then extend into the first threaded hole 31 opened on the end face of the roller sleeve 3, thereby fixing the end connector 4 to the roller sleeve 3. The second threaded hole 44 and the first threaded hole 31 are arranged in a one-to-one correspondence, as shown in Figures 6 and 8.

[0049] As shown in Figure 5, the end face of the end connector 4 is also provided with a protruding structure 42, which extends toward the roller sleeve 3 in the axial direction. A limiting groove that mates with the protruding structure 42 is provided at the corresponding end of the roller sleeve 3. The protruding structure 42 is positioned between two adjacent fasteners 41 in the circumferential direction. The fasteners 41 can be bolts.

[0050] The end connector 4 extends into the opening at the corresponding end of the roller sleeve 3, and a sealing ring 43 is provided between the outer wall of the end connector 4 and the inner wall of the roller sleeve 3.

[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, as shown in Figure 9. Even if the roller sleeve 3 deforms, it can protect the sensor 1 from being worn 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 end connector 4 and the inner cavity of the roller sleeve 3 can be fitted with a transition fit and sealed with two O-rings 43, as shown in Figures 6 and 7. The end connector 4 and the roller sleeve 3 can be fixed by 18 fasteners 41, as shown in Figure 5. As shown in Figure 7, several guide protrusions 42 can be provided on the end face of the end connector 4 that mates with the roller sleeve 3, and a guide limiting groove (not shown in the figure) is designed on the end face of the roller sleeve 3. This can effectively prevent the fasteners 41 (e.g., bolts) on the end face from coming out due to the deformation of the roller sleeve 3 under stress, thereby reducing the risk of the end connector 4 cracking due to stress from external forces. If the end connector does not have protrusions 42, the bolts used to connect the roller sleeve and the end connector will come out due to the stress after the roller sleeve deforms under stress, and will no longer bear the protective force. By providing protrusions 42, the protrusions 42 can bear the deformation force of the roller sleeve first, and then the bolts bear the force.

[0053] As shown in Figures 10 and 11, the iron core 11 includes a first iron core material layer 115 and a second iron core material layer 111 surrounding the first iron core material layer 115. The second iron core material layer 111 is formed by radially stacked sheet-like structures. Each sheet-like structure is fixed to the first iron core material layer 115 by fasteners (not shown in the figures), thereby forming the iron core 11. The hardness of the first iron core material layer 115 is less than that of the second iron core material layer 111, and the permeability of the first iron core material layer 115 is greater than that of the sheet-like structures. The second iron core material layer 111 forms a ring-like structure surrounding the first iron core material layer 115. The sensor also includes a magnetic shielding structure 13 disposed outside the coil; in a cross-section perpendicular to the axis of the iron core 11, the magnetic shielding structure 13 is an arc-shaped structure forming an opening. The material of the first iron core material layer 115 is an amorphous alloy; the sheet-like structures are silicon steel sheets. The fastener 112 is a pin. 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 sandwiched between the two first mounting plates 113 and 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. The iron core 11 is fixed to the first mounting plate 113 by the fasteners. 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. Figure 10 only shows the second mounting plate 114 at one end of the second iron core material layer 111. 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 faces the billet channel, so that the magnetic lines of force generated by the inductor 1 act on the billet in the billet channel.

[0054] By using a second core material layer with higher hardness and lower permeability wound around the outside of a first core material layer with lower hardness and higher permeability, not only is the hardness of the core guaranteed, but the overall permeability of the core is also improved. Furthermore, fasteners securely connect the first and second core material layers. By placing first mounting plates at both ends in the radial direction and second mounting plates at both ends in the axial direction of the core, the overall structure of the core becomes more stable. The first mounting plate is made of carbon steel, which, due to its magnetic permeability, does not affect the overall magnetic field strength. The second mounting plate is made of stainless steel, reducing the risk of rust and overheating at the core ends. Using a first core material layer with low hysteresis loss (e.g., stacked silicon steel sheets) on the outer layer further reduces energy loss.

[0055] Example 2

[0056] The difference between Embodiment 2 and Embodiment 1 is that the wall surface of the first segment 5A of the groove is arc-shaped. That is, the wall surfaces of both the first segment 5A and the second segment 5B of the groove are arc-shaped, as shown in Figure 12.

[0057] 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.

[0058] 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 roller-type electromagnetic stirring system, comprising a base (10), a roller sleeve (3) rotating relative to the base (10), and a sensor (1) disposed inside the roller sleeve (3), the sensor (1) being fixedly connected to the base (10); the outer wall of the roller sleeve (3) is provided with a plurality of grooves (5), each groove (5) being arranged sequentially along the axial direction of the roller sleeve (3); the grooves (5) form channels on the outer wall of the roller sleeve (3); in a cross section passing through the axial direction of the roller sleeve (3), the groove (5) includes a first groove segment (5A); characterized in that: The groove (5) further 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 protrusion formed on the wall of the second groove section (5B) faces away from the groove opening (51); at the position where the first groove section (5A) and the second groove section (5B) are connected, the wall of the groove (5) forms a turning structure (52).

2. The roller-type electromagnetic stirring system according to claim 1, characterized in that: The first segment (5A) of the groove is rectangular or trapezoidal in shape, or the wall of the first segment (5A) of the groove is arc-shaped.

3. The roller-type electromagnetic stirring system according to claim 1, characterized in that: The second section (5B) of the groove is formed in an arc shape or a semi-circle.

4. The roller-type electromagnetic stirring system according to claim 1, characterized in that: There is a gap between the sensor (1) and the inner wall of the roller sleeve (3).

5. The roller-type electromagnetic stirring system according to claim 1, characterized in that: From the end of the first segment (5A) of the groove furthest from the groove opening (51) to the end closest to the groove opening (51), the width of the first segment (5A) of the groove gradually increases; WA1≤WA2×1 / 2; WA1 and WA2 correspond to the width of the first segment (5A) furthest from the groove opening (51) and the width of the first segment (5A) closest to the groove opening (51), respectively.

6. The roller-type electromagnetic stirring system according to any one of claims 1-5, characterized in that: Each end of the roller sleeve (3) is fixedly connected to an end connector (4), and the end connector (4) is connected to the base (10) through a corresponding bearing (2).

7. The roller-type electromagnetic stirring system according to claim 6, characterized in that: The end face of the end connector (4) is fixedly connected to the corresponding end of the roller sleeve (3) by a plurality of fasteners (41) spaced apart in the circumferential direction.

8. The roller-type electromagnetic stirring system according to claim 7, characterized in that: The end face of the end connector (4) is also provided with a protruding structure (42), which extends toward the roller sleeve (3) in the axial direction. The roller sleeve (3) is provided with a limiting groove at the corresponding end that cooperates with the protruding structure (42).

9. The roller-type electromagnetic stirring system according to claim 8, characterized in that: The protruding structure (42) is disposed between two adjacent fasteners (41) in the circumferential direction.

10. The roller-type electromagnetic stirring system according to claim 6, characterized in that: The end connector (4) extends into the opening at the corresponding end of the roller sleeve (3), and a sealing ring (43) is provided between the outer wall of the end connector (4) and the inner wall of the roller sleeve (3).

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