Brake roller for roller type electromagnetic stirring

Abstract

The brake roller comprises an outer cylinder, an arc-shaped coaming and an iron core, the iron core is fixedly installed in the outer cylinder and is perpendicular to the axial direction of the outer cylinder, the cross section of the iron core is in a kidney shape, a brake coil is wound on the iron core and generates a brake magnetic field after being powered on, the arc-shaped coaming is in a semi-arc shape, and the arc-shaped coaming is in a semi-arc shape. The two arc-shaped coamings are connected in a sealed mode to form a hollow cylinder, the two ends of each arc-shaped coaming are connected with the inner sides of the end covers in a sealed mode respectively, the hollow cylinder is installed in the outer cylinder, and a gap is reserved between the outer surface of the hollow cylinder and the inner surface of the outer cylinder. The brake roller can generate longitudinal electromagnetic force parallel to the wide surface of the casting blank, can generate a deceleration brake effect on the over-high circulation speed of a liquid core in the middle of the wide surface of the casting blank, controls the circulation speed in a proper range, and is basically consistent with an existing electromagnetic stirring roller in appearance and only different in length. And the stirring roller and the brake roller can be combined into a whole, so that the existing stirring roller structure can be upgraded, reformed and mounted conveniently.

Description

Technical Field

[0001] The utility model relates to the technical fields of metallurgical equipment and electromagnetic stirring technology, and particularly relates to a braking roll for roll-type electromagnetic stirring. Background Art

[0002] In recent years, during the thin slab continuous casting and rolling process, roll-type electromagnetic stirring is installed in the secondary cooling roll train in the casting flow zone. In particular, roll-type electromagnetic stirring using a traveling wave magnetic field that can generate a transverse electromagnetic thrust is used to suppress the growth of columnar crystals in slab continuous casting and solve the corrugation defect, which has become the focus of attention at home and abroad and has been applied to varying degrees in the continuous casting production of steel grades with a greater tendency to form solidified columnar crystals, such as stainless steel and silicon steel.

[0003] Electromagnetic braking technology (Electromagnetic Brake, EMBr) is a technology that controls the flow of molten steel through an electromagnetic field, aiming to optimize the hydrodynamic behavior during continuous casting to improve the quality and efficiency of the cast slab. Through the flow suppression effect of the electromagnetic field, the liquid flow in the mold is redistributed, thereby improving the flow state of the molten steel, reducing turbulence, and making the flow field more uniform. This technology is of great significance for improving the quality of molten steel and production efficiency during continuous casting.

[0004] Patent CN108500228B discloses a method for controlling the flow field of a slab continuous casting mold, which uses an electromagnetic stirring device and an electromagnetic braking device to control the flow field of the slab continuous casting mold. The electromagnetic stirring device is arranged in the upper regions on both sides of the wide face of the mold, and the electromagnetic braking device is arranged in the lower regions on both sides of the wide face of the mold. The upper electromagnetic stirring device and the lower electromagnetic braking device are independent and separately arranged. The molten steel is stirred by the upper electromagnetic stirring device, and then the circulating flow velocity of the stirring is adjusted and controlled by the lower electromagnetic braking device, thereby adjusting and controlling the flow velocity of the molten steel. However, in this structure, the electromagnetic stirring structure and the braking structure are separately arranged, the braking effect is limited, and more installation space is required, making it difficult to retrofit in existing equipment. Therefore, developing an electromagnetic braking device that can be combined and assembled with an electromagnetic stirring device into one body is of great significance for simplifying the electromagnetic roll structure and improving the electromagnetic braking effect.

[0005] It should be noted that the above introduction of the technical background is only for the convenience of clearly and completely explaining the technical solutions of the present application and facilitating the understanding of those skilled in the art. It cannot be considered that the above technical solutions are well-known to those skilled in the art merely because these solutions are described in the background art part of the present application. Summary of the Utility Model

[0006] The purpose of the present utility model is to overcome the deficiencies of the prior art and provide a braking roll for roll-type electromagnetic stirring. By arranging a core perpendicular to the axial direction and a braking coil inside the cylinder, a longitudinal braking force parallel to the surface of the casting blank is generated, thereby adjusting the circulation speed of the molten steel in the casting blank.

[0007] To achieve the above purpose, the present utility model provides a braking roll for roll-type electromagnetic stirring, including an outer cylinder, arc-shaped enclosing plates, and a core. Both ends of the outer cylinder are fixedly connected with end covers. The core is fixedly installed inside the outer cylinder and is perpendicular to the axial direction of the outer cylinder. The cross-section of the core is kidney-shaped, and a braking coil is wound around the core. After the braking coil is energized, a braking magnetic field is generated. The arc-shaped enclosing plates are semi-circular arcs, and two arc-shaped enclosing plates are hermetically connected to form a hollow cylinder. Both ends of the arc-shaped enclosing plates are hermetically connected to the inner sides of the end covers respectively. The hollow cylinder is installed inside the outer cylinder, and there is a gap between the outer surface of the hollow cylinder and the inner surface of the outer cylinder.

[0008] Furthermore, the braking roll further includes an insulating baffle. The inner surface of the arc-shaped enclosing plate is in internal tangency connection with the insulating baffle, and the insulating baffle is sleeved on the outer surface of the braking coil to provide insulation protection for the braking coil.

[0009] Furthermore, the braking roll further includes a threaded connecting rod. A threaded hole corresponding to the threaded connecting rod is provided at the first end of the core. Through holes are provided on the arc-shaped enclosing plate and the insulating baffle located at the threaded hole end of the core. The first end of the threaded connecting rod passes through the through holes on the arc-shaped enclosing plate and the insulating baffle and is threadedly connected to the threaded hole of the core. A nut is threadedly connected to the second end of the threaded connecting rod.

[0010] Furthermore, a counterbore is provided on the outer periphery of the through hole of the arc-shaped enclosing plate, and the nut is installed in the counterbore, and the counterbore is filled with a waterproof coating.

[0011] Furthermore, a clamping groove is provided on the inner surface of the outer cylinder, a special-shaped key is clamped in the clamping groove, a V-shaped groove is provided at one end of the special-shaped key, and the second end of the threaded connecting rod is clamped in the V-shaped groove.

[0012] Furthermore, a wire passing hole is provided on the threaded connecting rod. Both ends of the braking coil are led out into the gap between the outer cylinder and the arc-shaped enclosing plate through the wire passing hole, and the wire passing hole is filled with a waterproof material for sealing.

[0013] Furthermore, a circular groove corresponding to the arc-shaped enclosing plate is provided on the inner side of the end cover, an O-shaped sealing ring is installed in the circular groove, and both ends of the arc-shaped enclosing plate are respectively clamped in the circular groove.

[0014] Further, both ends of the outer cylinder are fixedly connected to the first ends of the connecting seats, and the second ends of the connecting seats are connected to the electromagnetic stirring rollers.

[0015] The above solution of the present utility model has the following beneficial effects:

[0016] The braking roller for roll-type electromagnetic stirring provided by the present utility model is provided with a vertical axial core and a braking coil in the cylinder, generating a longitudinal braking force parallel to the surface of the billet, which can produce a decelerating braking effect on the too-fast circulation speed of the liquid core in the middle of the wide surface of the billet, thereby adjusting the circulation speed of the molten steel in the billet; at the same time, the outer shape of the braking roller is basically the same as that of the existing electromagnetic stirring roller, only the length is different. The stirring roller and the braking roller can be combined into an integral body, and the two functions of electromagnetic stirring and electromagnetic braking can be organically combined, improving the control effect of the molten steel circulation braking and facilitating the upgrading, transformation and installation of the existing stirring roller structure.

[0017] The core of the braking roller is kidney-shaped, and the rectangular side in the middle is parallel to the billet. At this time, the core is closer to the billet, and the core area in contact with the billet is larger. The magnetic lines of force generated by the braking coil mainly emit from one end of the core, pass through the billet and reach the core of the braking roller on the other side. The kidney-shaped cores on the symmetric two sides are closer and have a larger contact area, and the loss of the magnetic lines of force in the air is smaller, and the magnetic braking effect is better.

[0018] Other beneficial effects of the present utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the internal structure of the braking roller of the present utility model;

[0020] Figure 2 is an exploded view of the internal structure of the braking roller of the present utility model;

[0021] Figure 3 is a schematic diagram of the outer cylinder structure of the braking roller of the present utility model;

[0022] Figure 4 is a schematic diagram of the special-shaped key structure of the braking roller of the present utility model;

[0023] Figure 5 is a schematic diagram of the arc-shaped enclosing plate structure of the braking roller of the present utility model;

[0024] Figure 6 is a schematic diagram of the threaded connecting rod structure of the braking roller of the present utility model;

[0025] Figure 7 is a schematic diagram of the installation of the braking roller of the present utility model;

[0026] Figure 8Front view of the electromagnetic force after the combined installation of the electromagnetic stirring rod and the braking roller of the present utility model;

[0027] Figure 9 Side view of the electromagnetic force after the combined installation of the electromagnetic stirring rod and the braking roller of the present utility model.

[0028]

Explanation of the reference numerals

[0029] 1 - Electromagnetic stirring roller; 2 - Braking roller; 20 - Outer cylinder; 201 - Card slot; 21 - Special-shaped key; 211 - V-shaped groove; 22 - Nut; 23 - Threaded connecting rod; 24 - Waterproof coating; 25 - Arc-shaped enclosing plate; 26 - Insulating enclosing plate; 27 - Iron core; 28 - End cover; 29 - O-ring seal; 3 - Connecting seat; 4 - Cast billet; 5 - Nozzle. Specific implementation manners

[0030] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. Among the various specific technical features and embodiments described in the specific implementation manners, without contradiction, they can be combined in any suitable manner. For example, different specific technical features / embodiments can be combined to form different implementation manners. To avoid unnecessary repetition, various possible combination manners of the various specific technical features / embodiments in the present utility model will not be described separately.

[0031] It should be noted that the terms "set" and "connected" should be understood in a broad sense. For example, it can be directly set, installed, connected, or indirectly set and connected through intermediate components and intermediate structural members. In addition, the "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicated in the present utility model are the orientation or position relationship based on the orientation or position relationship shown in the drawings or the conventional placement state or use state, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the structural members, features, devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0032] As Figures 1 to 7As shown in the figure, the present utility model provides a braking roll for roll-type electromagnetic stirring, which includes an outer cylinder 20, an iron core 27 and end covers 28. The two ends of the outer cylinder 20 are respectively connected to the electromagnetic stirring roll 1 through connecting seats 3. The iron core 27 is fixedly installed inside the outer cylinder 20 and is perpendicular to the axial direction of the outer cylinder 20. The cross-section of the iron core 27 is kidney-shaped, and a braking coil is wound around the iron core 27. The iron core 27 is kidney-shaped, that is, in the form of semicircles at both ends and a rectangle in the middle. One side of the middle rectangle is parallel to the casting blank 4. At this time, the iron core 27 is closer to the casting blank 4, and the area of the iron core 27 in contact with the casting blank 4 is larger. The magnetic lines of force generated by the braking coil mainly emit from one end of the iron core 27, pass through the casting blank 4 and reach the iron core 27 of the braking roll 2 on the other side. The iron cores 27 on the symmetric two sides are closer and have a larger contact area, so the loss of magnetic lines of force in the air is smaller, and the magnetic braking effect is better. In this embodiment, the upper and lower edges on both sides of the iron core 27 are chamfered to accommodate more coil windings and are also more convenient for installation. The direction of the iron core 27 is perpendicular to the main shaft 11. At this time, after the braking coil is energized, a longitudinal braking magnetic field parallel to the surface of the casting blank 4 (parallel to the flow direction of the molten steel) is generated. The braking magnetic field will generate a longitudinal thrust parallel to the wide surface of the casting blank 4 to brake the position with a faster circulation speed in the middle of the wide surface of the casting blank 4 and avoid too fast local circulation speed.

[0033] Furthermore, the braking roll 2 further includes arc-shaped enclosing plates 25, insulating baffles 26 and threaded connecting rods 23. The arc-shaped enclosing plates 25 are semi-circular arcs. Two arc-shaped enclosing plates 25 are hermetically connected to form a hollow cylinder. The hollow cylinder is installed inside the outer cylinder 20 and is parallel to the axial direction of the outer cylinder 20. There is a gap between the outer surface of the hollow cylinder and the inner surface of the outer cylinder 20 to facilitate the cooling medium and wires to pass through this gap. The two ends of the arc-shaped enclosing plates 25 are respectively hermetically connected to the inner sides of the end covers 28. Specifically, in this embodiment, circular grooves corresponding to the hollow cylinders formed by the arc-shaped enclosing plates 25 are provided on the inner sides of the end covers 28. O-ring seals are installed in the circular grooves. The two ends of the arc-shaped enclosing plates 25 are respectively clamped in the circular grooves and fixed to form a seal. The place where the two arc-shaped enclosing plates 25 abut is sealed by setting a seal ring or applying a sealing coating, etc., and no specific limitation is made here. The arc-shaped enclosing plates 25 and the end covers 28 are hermetically connected to form a sealed hollow cylinder. The iron core 27 and the braking coil are fixed in this hollow cylinder to form a good isolation and protection for the braking coil and the iron core 27. Among them, the inner surface of the arc-shaped enclosing plate 25 is internally tangent to the insulating baffle 26. The insulating baffle 26 can be approximately semi-circular arc. Two insulating baffles 26 form an approximately cylindrical shape and are internally tangent to the inner surface of the arc-shaped enclosing plate 25. At the same time, the insulating baffle 26 is sleeved on the outer surface of the braking coil to provide insulation protection for the braking coil and prevent electric leakage accidents. In other embodiments, the insulating baffle 26 can also be set as an integral structure or other structures.

[0034] Further, one end of the iron core 27 is provided with a threaded hole corresponding to the threaded connecting rod 23. Through holes are provided in the arc-shaped baffle 25 and the insulating baffle 26 at one end of the threaded hole of the iron core 27. The first end of the threaded connecting rod 23 passes through the through holes in the arc-shaped baffle 25 and the insulating baffle 26 and is threadedly connected to the threaded hole of the iron core for fixation. Further, a counterbore is provided on the outer periphery of the through hole of the arc-shaped baffle 25. The threaded connecting rod 27 is threadedly connected to the nut 22 from the second end. After the nut 22 is fixed, it is located in the counterbore of the arc-shaped baffle 25. After the nut 22 is fixed, a waterproof coating is filled in the counterbore for sealing. At the same time, a clamping groove 201 is provided on the inner surface of the outer cylinder 20. The special-shaped key 21 is clamped in the clamping groove 201. A V-shaped groove 211 is provided at one end of the special-shaped key 21. The grooving direction of the V-shaped groove 211 is perpendicular to the threaded connecting rod 23. After the threaded connecting rod 23 and the nut 22 are fixed, the upper end will protrude from the surface of the nut 22. The protruding upper end portion of the threaded connecting rod 23 is just clamped in the V-shaped groove 211, which is used to restrict the axial movement of the threaded connecting rod 23 inside the outer cylinder 20, that is, the overall fixation of the battery core 27, the insulating baffle 26 and the outer cylinder 20 is realized. The structure is simple, and the internal space of the outer cylinder 20 is utilized to the maximum extent.

[0035] In the braking roller 2, a wire threading hole is provided on the threaded connecting rod 23. The two terminal ends of the braking coil of the braking roller 2 are led out through the wire threading hole into the gap between the outer cylinder 20 and the arc-shaped baffle 25, and then pass out of the gap and outside the outer cylinder 20 to be electrically connected to an external power supply. The wire threading hole on the threaded connecting rod 23 is filled with a waterproof material for sealing to prevent water leakage.

[0036] Both ends of the braking roller 2 are respectively connected to the first end of the traveling wave roller 1 through the connecting seat 3. The second ends of the traveling wave rollers 1 are both connected with the connecting seat 3, that is, both ends of the two traveling wave rollers 1 are rotatably connected to the connecting seat 3. The connecting seats 3 at one end of the two traveling wave rollers 1 close to the braking roller 2 are both fixedly connected to the braking roller 2, forming a roller-type electromagnetic stirring structure with a braking function of traveling wave roller - braking roller - traveling wave roller.

[0037] When using the braking roller provided by the present utility model, please refer to Figures 7 to 9, both ends of the braking roll 2 are respectively connected to the electromagnetic stirring roll 1 through the connecting seats 3. The electromagnetic stirring rolls 1 provided at both ends respectively generate the transverse electromagnetic forces F1 and F2 parallel to the wide surface of the billet 4. The transverse electromagnetic forces F1 and F2 push the unfrozen liquid core in the secondary cooling zone of the billet 4 to stir and form two small circulation flows. The two small circulation flows will be superimposed in the middle of the wide surface of the billet 4, resulting in too fast a circulation speed in the middle. At the same time, there is also a nozzle 5 above the mold. The molten steel flowing out of the nozzle 5 flows downward, which will further accelerate the circulation speed in the middle near the mold. At this time, the braking roll 2 located in the middle will generate a longitudinal electromagnetic force F3 parallel to the wide surface of the billet 4. The acting direction of F3 is opposite to the flowing direction of the molten steel, and it can produce a decelerating and braking effect on the too fast circulation speed of the liquid core in the middle of the wide surface of the billet, control the circulation speed in the middle within a suitable range, avoid too deep impact of the flow bulge, cause disturbance to the liquid level at the mold, and prevent serious quality problems such as slag entrainment.

[0038] The above is the preferred implementation mode of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle described in the present invention, several improvements and retouches can still be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A braking roll for roll-type electromagnetic stirring, characterized in that, It includes an outer cylinder (20), an arc-shaped enclosing plate (25) and an iron core (27). The iron core (27) is fixedly installed inside the outer cylinder (20) and is perpendicular to the axis of the outer cylinder (20). The cross-section of the iron core (27) is kidney-shaped. A braking coil is wound around the iron core (27). After the braking coil is energized, a braking magnetic field is generated. The arc-shaped enclosing plate (25) is semi-circular. Two arc-shaped enclosing plates (25) are hermetically connected to form a hollow cylinder. The two ends of the arc-shaped enclosing plate (25) are respectively hermetically connected to the inner side of the end cover (28). The hollow cylinder is installed inside the outer cylinder (20), and there is a gap between the outer surface of the hollow cylinder and the inner surface of the outer cylinder (20).

2. The braking roll for roll-type electromagnetic stirring according to claim 1, wherein The braking roller (2) further includes an insulating baffle (26). The inner surface of the arc-shaped enclosing plate (25) is in internal tangent connection with the insulating baffle (26). The insulating baffle (26) is sleeved on the outer surface of the braking coil to provide insulation protection for the braking coil.

3. The braking roll for roll-type electromagnetic stirring according to claim 2, characterized in that, The braking roller (2) further includes a threaded connecting rod (23). A threaded hole corresponding to the threaded connecting rod (23) is opened at the first end of the iron core (27). Through holes are opened in the arc-shaped enclosing plate (25) and the insulating baffle (26) at the threaded hole end of the iron core (27). The first end of the threaded connecting rod (23) passes through the through holes in the arc-shaped enclosing plate (25) and the insulating baffle (26) and is threadedly connected to the threaded hole of the iron core (27). A nut (22) is threadedly connected to the second end of the threaded connecting rod (23).

4. The braking roll for roll-type electromagnetic stirring according to claim 3, characterized in that, A counterbore is opened on the outer periphery of the through hole of the arc-shaped enclosing plate (25). The nut (22) is installed in the counterbore, and a waterproof coating (24) is filled in the counterbore.

5. The braking roll for roll-type electromagnetic stirring according to claim 3, characterized in that, A clamping groove (201) is provided on the inner surface of the outer cylinder (20). A special-shaped key (21) is clamped in the clamping groove (201). A V-shaped groove (211) is opened at one end of the special-shaped key (21). The second end of the threaded connecting rod (23) is clamped in the V-shaped groove (211).

6. The braking roll for roll-type electromagnetic stirring according to claim 3, characterized in that, A wire passing hole is provided on the threaded connecting rod (23). The two ends of the braking coil are led out through the wire passing hole into the gap between the outer cylinder (20) and the arc-shaped enclosing plate (25), and the wire passing hole is filled and sealed with a waterproof material.

7. The braking roll for roll-type electromagnetic stirring according to claim 2, characterized in that, A circular groove corresponding to the arc-shaped enclosing plate (25) is opened on the inner side of the end cover (28). An O-ring (29) is installed in the circular groove. The two ends of the arc-shaped enclosing plate (25) are respectively clamped in the circular groove.

8. The braking roll for roll-type electromagnetic stirring according to claim 1, characterized in that, Both ends of the outer cylinder (20) are fixedly connected to the first ends of connecting seats (3). The second ends of the connecting seats (3) are connected to an electromagnetic stirring roller (1).

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