KR stirring head steel structure for ladle pretreatment

Abstract

The utility model discloses a KR stirring head steel structure for ladle pretreatment, which belongs to the field of molten iron desulfurization equipment and comprises a steel core column positioned in the middle, the top end of the steel core column is connected with a connector, and a plurality of inner plates are uniformly and fixedly arranged at the bottom of the outer surface of the steel core column along the radial direction. The stirring column and the stirring blade are formed by forming the inner tooth groove in the outer edge of the inner plate, pouring the refractory material into the pouring space, waiting for cooling forming and removing the mold, and the inner tooth groove of the inner plate is filled with the refractory material when the refractory material is poured, so that the refractory material is meshed with the inner plate more firmly, and the service life of the stirring column and the stirring blade is prolonged. In addition, the inner tooth grooves are formed in the inner plate, so that the overall thermal expansion of the steel can be reduced, the thermal expansion of the steel structure is more uniform, and the stress and load generated on the refractory material are reduced, thereby prolonging the service life (using times) of the refractory material, reducing the weight of the steel structure and reducing the energy consumption generated by rotation of the KR stirrer in a working state.

Description

Technical Field

[0001] The utility model belongs to the field of hot metal desulfurization equipment, and particularly relates to a steel structure of a KR stirrer head for ladle pretreatment. Background Technique

[0002] The KR method for desulfurization is a hot metal pretreatment technology widely used in modern steelmaking industry. Its purpose is to promote the effective mixing of hot metal and desulfurizer through mechanical stirring, so as to achieve the purpose of deep desulfurization. This method drives the mixing of hot metal and desulfurizer by the stirring blades immersed in the hot metal, has good kinetic characteristics, and can stably achieve deep desulfurization in hot metal. The principle of the KR method for desulfurization is to immerse the stirring column cast with refractory materials and baked, and the stirring blades fixed on it, into the molten pool of the ladle to a certain depth. The output shaft of the mixer drives the stirring column and the stirring blades to rotate. By the vortex generated by its rotation, the weighed desulfurizer is added to the surface of the hot metal by the feeder and is involved in the hot metal by the vortex, so that the calcium oxide-based desulfurization powder fully contacts and reacts with the hot metal, thus achieving the purpose of desulfurization.

[0003] In the production of the existing KR stirrer head, a layer of refractory casting material needs to be prefabricated outside the steel structure of the stirrer head. The existing production process is as follows: first, a mold is surrounded outside the stirrer head to form a casting space between the mold and the stirrer head, and then refractory materials are poured into the casting space, waiting for cooling and forming, and then the mold is removed, that is, the stirring column and the stirring blades are formed. When the existing KR stirrer head is cast with refractory materials, since the steel structure inside the stirring blade has a smooth edge, the combination between the steel structure inside the stirring blade and the refractory material is not firm. After multiple uses, the refractory material on the steel structure inside the stirring blade is easy to fall off, reducing the service life of the stirrer head.

[0004] After retrieval, the patent with the patent number CN 207619444 U provides a KR stirrer head, including a flange, a partition board, a middle column and an inner pipe of the middle column, a stirring blade and an inner plate of the stirring blade. The middle column includes an inner pipe of the middle column and the castable laid on the outer surface of the inner pipe of the middle column. The inner pipe of the middle column is a steel pipe. A flange is fixedly and vertically connected to the upper end surface of the inner pipe of the middle column. A partition board parallel to the flange is fixedly arranged on the inner pipe of the middle column at a certain distance below the flange. A plurality of stirring blades evenly distributed along the circumference of the outer circle of the middle column are arranged at the lower end of the middle column. The stirring blade includes an inner plate of the stirring blade and the castable laid on the surface of the inner plate of the stirring blade. The surface of the inner pipe of the middle column and the inner plate of the stirring blade are densely covered with V-shaped steel bars, and the lower ends of the V-shaped steel bars are welded to the surface of the inner pipe of the middle column or the inner plate of the stirring blade. The utility model uses the refractory material as the castable. The periphery of the KR stirrer head matrix is densely covered with reinforcing ribs to increase the stability of the castable. At the same time, the edges between the stirring blades are rounded and a certain slope is formed to increase the anti-twisting ability of the stirring blades.

[0005] The outer edge of the inner plate of the stirring blade in the above solution is a smooth edge, resulting in an insecure bond between the steel structure inside the stirring blade and the refractory material. After repeated use, the refractory material on the steel structure inside the stirring blade is likely to fall off, reducing the service life of the stirring head. Summary of the Invention

[0006] The purpose of the present utility model is to provide a steel structure of a KR stirring head for hot metal ladle pretreatment, which has the advantage of a firm bond between the steel structure inside the stirring blade and the refractory material, solves the problem that the refractory material on the steel structure inside the stirring blade is likely to fall off, and effectively improves the service life of the stirring head.

[0007] The present utility model adopts the following technical solution: A steel structure of a KR stirring head for hot metal ladle pretreatment, including a steel core column located in the middle. The top of the steel core column is connected with a connection head. A plurality of inner plates are uniformly and fixedly arranged along the radial direction at the bottom of the outer surface of the steel core column. A plurality of anchor bolts are fixedly arranged on the outer surfaces of the steel core column and each inner plate. A plurality of inner tooth grooves are opened on the outer side surface of the inner plate in the vertical direction.

[0008] Further, the cross-section of the inner tooth groove is a trapezoidal structure, with the long side inside the inner plate and the short side on the outer side surface of the inner plate.

[0009] Further, a plurality of through holes are opened on the inner plate.

[0010] Further, the connection head includes a connection flange fixedly arranged at the top of the steel core column. The bottom end of the output shaft of the mixer is fixedly provided with a drive flange. Bolt holes are opened on both the drive flange and the connection flange. A through bolt is used to pass through the corresponding bolt holes of the drive flange and the corresponding bolt holes of the connection flange, and a fastening nut is screwed on to fixedly connect the drive flange and the connection flange together.

[0011] Further, an annular groove is opened on the upper end surface of the connection flange. A plurality of sliders are slidably arranged along the arc direction of the annular groove in the annular groove. The bolt holes of the connection flange are opened on the sliders. A positioning device is arranged on the upper end surface of the connection flange, and the positioning device is used to limit the position of each slider so that each slider can move within a set distance range.

[0012] Further, a plurality of through grooves are opened at the positions corresponding to the sliders on the inner bottom wall of the annular groove of the connection flange; the positioning device limits the sliders to be located at the positions of the corresponding through grooves in the annular groove.

[0013] Further, chamfers are opened at the tops of the bolt holes of the sliders.

[0014] Further, the positioning device includes an outer fixing ring. A first arc-shaped sliding groove communicating with the inner hole of the outer fixing ring is formed on the lower end surface of the outer fixing ring. An outer lip plate protrudes from the upper part of the outer side surface of the sliding block. The outer fixing ring is fixed to the upper end surface of the connecting flange by screws. The outer fixing ring is located outside the annular groove. The outer lip plate of each sliding block is located in the corresponding first arc-shaped sliding groove of the outer fixing ring. The first arc-shaped sliding groove of the outer fixing ring is arranged corresponding to the bolt hole of the driving flange.

[0015] Further, the positioning device further includes an inner fixing plate fixedly arranged on the upper end surface of the connecting flange inside the annular groove. A plurality of second arc-shaped sliding grooves corresponding to the first arc-shaped sliding grooves are formed on the lower end surface of the inner fixing plate. An inner lip plate protrudes from the upper part of the inner side surface of the sliding block. The inner lip plate is located in the corresponding second arc-shaped sliding groove. The second arc-shaped sliding groove is concentric with the first arc-shaped sliding groove. The angular radian of the first arc-shaped sliding groove and the second arc-shaped sliding groove is equal. The two radius sides of the first arc-shaped sliding groove and the two radius sides of the second arc-shaped sliding groove coincide.

[0016] Further, a circular plate and a plurality of rib plates are uniformly fixed on the upper part of the outer surface of the steel core column along the circumference. The bottom end of each rib plate is fixedly arranged on the upper end surface of the circular plate. The upper end surface of each rib plate is fixedly arranged on the lower end surface of the connecting flange.

[0017] 1. In the production of the KR stirring head, by opening inner tooth grooves on the outer edge of the inner plate, a mold is surrounded around the steel core column and the outer side of the inner plate, so that a pouring space is formed between the mold and the steel core column and the inner plate. Then, refractory materials are poured into the pouring space, and after waiting for cooling and forming, the mold is removed, thus forming the stirring column and the stirring blades. Since inner tooth grooves are provided on the inner plate, the refractory materials fill the inner tooth grooves of the inner plate during pouring, making the refractory materials bite more firmly with the inner plate. In addition, the inner tooth grooves opened on the inner plate can reduce the overall thermal expansion of the steel, make the thermal expansion of the steel structure more uniform, reduce the stress and load on the refractory materials, thereby improving the service life (number of uses) of the refractory materials, reducing the weight of the steel structure, and reducing the energy consumption generated by the rotation of the KR stirrer during the working state.

[0018] 2. By setting the sliding blocks and opening the bolt holes of the connecting flange on the sliding blocks, when the through bolts penetrate the corresponding bolt holes of the driving flange and the corresponding bolt holes of the connecting flange from top to bottom, the bolt holes of the driving flange and the connecting flange are prone to misalignment, resulting in the bottom end of the through bolt pressing against the upper end surface of the sliding block. A tool is inserted upward from the corresponding through groove below the connecting flange to contact the corresponding sliding block, and the sliding block is moved by the tool, making it easier for the through bolt to pass through the bolt hole of the sliding block, achieving the purpose of facilitating the installation of the KR stirring head. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall three-dimensional structure schematic diagram of the present invention;

[0020] Figure 2 This is the front view structural schematic diagram of the present utility model;

[0021] Figure 3 This is the three-dimensional structural schematic diagram of the steel core column of the present utility model;

[0022] Figure 4 This is the front view structural schematic diagram of the inner plate of the present utility model;

[0023] Figure 5 This is the three-dimensional structural schematic diagram of the inner fixing plate of the present utility model;

[0024] Figure 6 This is the three-dimensional structural schematic diagram of the circular plate of the present utility model;

[0025] Figure 7 This is the three-dimensional structural schematic diagram of the outer fixing ring and the inner fixing plate of the present utility model;

[0026] Figure 8 This is the three-dimensional structural schematic diagram of the bottom of the outer fixing ring and the inner fixing plate of the present utility model;

[0027] Figure 9 This is the three-dimensional structural schematic diagram of the rib plate of the present utility model;

[0028] Figure 10 This is the three-dimensional structural schematic diagram of the slider of the present utility model.

[0029] In the figure, 1. steel core column; 2. connecting head; 3. inner plate; 4. anchor nail; 5. inner tooth groove; 6. stirring column; 7. stirring blade; 8. through hole; 9. connecting flange; 10. output shaft; 11. driving flange; 12. bolt hole; 13. through bolt; 14. fastening nut; 15. annular groove; 16. slider; 17. positioning device; 18. through groove; 19. chamfer; 20. outer fixing ring; 21. first arc-shaped chute; 22. outer lip plate; 23. screw; 24. inner fixing plate; 25. second arc-shaped chute; 26. inner lip plate; 27. inner hexagon bolt; 28. nose block; 29. lifting hole; 30. circular plate; 31. rib plate. Specific embodiments

[0030] The following describes the present utility model in detail with reference to the accompanying drawings and embodiments:

[0031] Please refer to Figures 1-10, for the steel structure of the KR stirring head used for hot metal ladle pretreatment, it includes a steel core column 1 in the middle. The top of the steel core column 1 is connected with a connecting head 2. At the bottom of the outer surface of the steel core column 1, a number of inner plates 3 are uniformly fixed along the radial direction. A plurality of anchor nails 4 are fixedly arranged on the outer surfaces of the steel core column 1 and each inner plate 3. A number of inner tooth grooves 5 are opened on the outer side surface of the inner plate 3 along the up and down direction.

[0032] During the production of the KR stirring head, it is necessary to precast a layer of refractory casting material outside the steel core column 1 and the inner plate 3. The production process is as follows: First, a mold is surrounded outside the steel core column 1 and the inner plate 3, so that a casting space is formed between the mold and the steel core column 1 and the inner plate 3. Then, refractory material is poured into the casting space and waits for cooling and shaping. After removing the mold, the stirring column 6 and the stirring blade 7 are formed. The anchor nails 4 increase the bonding force between the refractory material and the steel core column 1 and the inner plate 3. Since the inner tooth grooves 5 are provided on the inner plate 3, the refractory material fills the inner tooth grooves 5 of the inner plate 3 during pouring, making the refractory material bite more firmly with the inner plate 3. In addition, the inner tooth grooves 5 are opened on the inner plate 3, which can reduce the overall thermal expansion of the steel, make the thermal expansion of the steel structure more uniform, reduce the stress and load on the refractory material, thereby improving the service life (number of uses) of the refractory material, reducing the weight of the steel structure, and reducing the energy consumption generated by the rotation of the KR stirrer during the working state; when the KR stirring head is in use, the connecting head 2 at the top of the KR stirring head is connected with the output shaft 10 of the mixer. Below the mixer is a hot metal ladle filled with hot metal. A desulfurizing agent is put into the hot metal ladle. The mixer can be lifted and lowered. The mixer moves downward so that the stirring column 6 and the stirring blade 7 are inserted into the hot metal for operation, quickly stirring the hot metal and accelerating the desulfurization reaction between the desulfurizing agent and the hot metal to achieve the purpose of desulfurization pretreatment of the hot metal; the desulfurization process for hot metal pretreatment requires the production of high-quality, erosion-resistant and long-life KR stirring heads, and the service life is required to reach more than 350 times.

[0033] In this embodiment, the cross-section of the inner tooth groove 5 is a trapezoidal structure, with the long side inside the inner plate 3 and the short side on the outer side surface of the inner plate 3; the short side is 90 mm and the long side is 100 mm.

[0034] In this embodiment, a number of through holes 8 are opened on the inner plate 3; when a layer of refractory casting material is precast outside the steel core column 1 and the inner plate 3, the refractory material will fill the through holes 8 to form refractory material columns, further strengthening the bonding force between the refractory material and the inner plate 3.

[0035] Since refractory materials are consumables, when the KR stirrer head is in use, as the number of uses increases, the refractory materials will fatigue and fall off until they can no longer meet the production requirements. Therefore, in the production process of hot metal desulfurization, it is often necessary to replace the new KR stirrer head. To achieve the purpose of facilitating the replacement of the KR stirrer head, in this embodiment, the connector 2 includes a connection flange 9 fixedly arranged at the top end of the steel core column 1, and a drive flange 11 is fixedly arranged at the bottom end of the output shaft 10 of the mixer. Bolt holes 12 are formed in both the drive flange 11 and the connection flange 9. A through bolt 13 is used to pass through the bolt hole 12 corresponding to the drive flange 11 and the bolt hole 12 corresponding to the connection flange 9, and a fastening nut 14 is screwed on to fixedly connect the drive flange 11 and the connection flange 9 together. During use, the mixer drives the drive flange 11 to rotate through the output shaft 10, thereby driving the connection flange 9 to rotate, and further driving the stirring column 6 to rotate. The stirring column 6 inserted into the hot metal drives the stirring blades 7 to operate, quickly stirring the hot metal and accelerating the desulfurization reaction between the desulfurizer and the hot metal, achieving the purpose of pre-desulfurizing the hot metal.

[0036] The connection method between the KR stirrer head and the output shaft 10 of the mixer in the above solution is fixed through the drive flange 11, the connection flange 9 and the through bolt 13. Since the mass of the KR stirrer head is relatively heavy, when replacing the KR stirrer head, it is not easy to dock the flange of the KR stirrer head with the flange of the output shaft 10 of the mixer. When inserting the through bolt 13, it is relatively difficult because the bolt holes 12 of the connection flange 9 of the KR stirrer head and the drive flange 11 of the output shaft 10 of the mixer are misaligned.

[0037] To solve the above problems, in this embodiment, an annular groove 15 is formed on the upper end surface of the connecting flange 9. A plurality of sliders 16 are slidably arranged in the annular groove 15 along the arc direction of the annular groove 15. The bolt holes 12 of the connecting flange 9 are formed on the sliders 16. A positioning device 17 is arranged on the upper end surface of the connecting flange 9. The positioning device 17 is used to limit the position of each slider 16 so that each slider 16 can move within a set distance range. During use, the number of sliders 16 corresponds to the number of bolt holes 12 of the driving flange 11, and the position of each slider 16 of the connecting flange 9 limited by the positioning device 17 is roughly consistent with the distribution of the bolt holes 12 of the driving flange 11. The new KR agitator head is moved to the output shaft 10 of the mixer through a lifting tool, so that the connecting flange 9 and the driving flange 11 are butted. Then, a through bolt 13 is first passed through the corresponding bolt hole 12 of the driving flange 11 and the corresponding bolt hole 12 of the connecting flange 9 from top to bottom. Then, the remaining through bolts 13 are successively passed through the corresponding bolt holes 12 of the driving flange 11 and the corresponding bolt holes 12 of the connecting flange 9. Then, the fastening nuts 14 are screwed on to fixedly connect the driving flange 11 and the connecting flange 9 together. When the through bolt 13 passes through the corresponding bolt hole 12 of the driving flange 11 and the corresponding bolt hole 12 of the connecting flange 9 from top to bottom, since the bolt holes 12 of the driving flange 11 and the connecting flange 9 are prone to misalignment when the driving flange 11 and the connecting flange 9 are butted, it is difficult for the through bolt 13 to pass through the corresponding bolt hole 12 of the driving flange 11 and the corresponding bolt hole 12 of the connecting flange 9. By providing the sliders 16 and forming the bolt holes 12 of the connecting flange 9 on the sliders 16, when the through bolt 13 passes through the corresponding bolt hole 12 of the driving flange 11 and the corresponding bolt hole 12 of the connecting flange 9 from top to bottom, the bottom end of the through bolt 13 abuts against the upper end surface of the slider 16. At this time, by swaying the bolt by hand, the bottom end of the bolt can drive the slider 16 to move a set distance, making it easier for the through bolt 13 to pass through the bolt hole 12 of the slider 16. That is, when the driving flange 11 and the connecting flange 9 are fixed by the through bolt 13, the bolt holes 12 of the connecting flange 9 can move slightly at the original position through the sliders 16, increasing the probability of the through bolt 13 passing through the bolt holes 12 of the connecting flange 9 and making the installation easier.

[0038] In order to more conveniently drive the movement of the slider 16, in this embodiment, a plurality of through slots 18 are provided at positions corresponding to the inner bottom wall of the annular slot 15 of the connecting flange 9 and the slider 16; the positioning device 17 defines the position of the slider 16 in the annular slot 15 corresponding to the through slots 18; during use, when the through bolt 13 penetrates the corresponding bolt hole 12 of the driving flange 11 and the corresponding bolt hole 12 of the connecting flange 9 from top to bottom, if the bolt holes 12 of the driving flange 11 and the bolt holes 12 of the connecting flange 9 are misaligned, a tool is used to extend upward from the corresponding through slot 18 below the connecting flange 9 to contact the corresponding slider 16, and the slider 16 is moved by the tool, so that the through bolt 13 can more easily pass through the bolt hole 12 of the slider 16.

[0039] In order to enable the through bolt 13 to more easily pass through the bolt hole 12 of the connecting flange 9, in this embodiment, chamfers 19 are provided at the tops of the bolt holes 12 of the slider 16. The chamfers 19 expand the area of the opening at the top of the bolt hole 12. When the through bolt 13 penetrates the corresponding bolt hole 12 of the driving flange 11 and the corresponding bolt hole 12 of the connecting flange 9 from top to bottom, the through bolt 13 can more easily enter the chamfer 19 at the top of the bolt hole 12 and then more easily enter the bolt hole 12 of the connecting flange 9, further increasing the probability of the through bolt 13 passing through the bolt hole 12 of the connecting flange 9 and making the installation easier.

[0040] In this embodiment, the positioning device 17 includes an outer fixing ring 20. A first arc-shaped chute 21 communicating with the inner hole of the outer fixing ring 20 is provided on the lower end surface of the outer fixing ring 20. An outer lip plate 22 protrudes from the upper part of the outer side surface of the slider 16. During installation, the outer fixing ring 20 is fixed to the upper end surface of the connecting flange 9 by screws 23. The outer fixing ring 20 is located outside the annular slot 15, and the outer lip plate 22 of each slider 16 is located in the corresponding first arc-shaped chute 21 of the outer fixing ring 20. When the slider 16 moves in the annular slot 15, the outer lip plate 22 is driven to move in the first arc-shaped chute 21 of the outer fixing ring 20. The arc length of the first arc-shaped chute 21 defines the movement range of the outer lip plate 22. The first arc-shaped chute 21 of the outer fixing ring 20 is arranged corresponding to the bolt hole 12 of the driving flange 11; by providing the outer fixing ring 20 and opening the first arc-shaped chute 21 on the outer fixing ring 20, the movement range of the outer lip plate 22 is limited by the first arc-shaped chute 21, and thus the movement range of the slider 16 is limited.

[0041] In this embodiment, the positioning device 17 further includes an inner fixing plate 24 fixedly arranged on the upper end surface inside the annular groove 15. A plurality of second arc-shaped chutes 25 corresponding to the first arc-shaped chutes 21 are formed on the lower end surface of the inner fixing plate 24. An inner lip plate 26 protrudes from the upper part of the inner side surface of the slider 16. The inner lip plate 26 is located in the corresponding second arc-shaped chute 25. The second arc-shaped chute 25 is concentric with the first arc-shaped chute 21. The angular radian of the first arc-shaped chute 21 is equal to that of the second arc-shaped chute 25. The two radius sides of the first arc-shaped chute 21 coincide with the two radius sides of the second arc-shaped chute 25. When the slider 16 slides in the annular groove 15, it drives the outer lip plate 22 and the inner lip plate 26 to move in the first arc-shaped chute 21 and the second arc-shaped chute 25 respectively. The first arc-shaped chute 21 and the second arc-shaped chute 25 respectively limit the moving ranges of the outer lip plate 22 and the inner lip plate 26, thereby limiting the moving range of the slider 16. The inner fixing plate 24 is fixed to the connecting flange 9 by inner hexagon bolts 27.

[0042] In this embodiment, a plurality of nose blocks 28 are evenly and fixedly arranged on the circumferential surface of the connecting flange 9. A hanging hole 29 is formed in each nose block 28. When installing the KR agitator head, the hoist lifts the KR agitator head through the hanging hole 29 of the nose block 28 for movement.

[0043] In order to increase the stability of the connection between the connecting flange 9 and the steel core column 1, in this embodiment, a circular plate 30 and a plurality of rib plates 31 are evenly and fixedly arranged on the upper part of the outer surface of the steel core column 1 along the circumference. The bottom end of each rib plate 31 is fixedly arranged on the upper end surface of the circular plate 30. The upper end surface of each rib plate 31 is fixedly arranged on the lower end surface of the connecting flange 9.

[0044] Working principle of the utility model: when assembling the connecting head 2, firstly, put each slider 16 into the annular groove 15 of the connecting flange 9, and make the lower end faces of the outer lip plate 22 and the inner lip plate 26 of the slider 16 contact with the upper end face of the connecting flange 9, then fix the outer fixing ring 20 to the upper end face of the connecting flange 9 by means of screws 23, and make the outer lip plate 22 of each slider 16 be located in the corresponding first arc groove 21 of the outer fixing ring 20, then fix the inner fixing plate 24 to the upper end face of the connecting flange 9 by means of hexagon socket bolts 27, and make the inner lip plate 26 of each slider 16 be located in the corresponding second arc groove 25 of the inner fixing plate 24; complete the assembly of the connecting head 2; when installing the KR mixing head, move the new KR mixing head to the output shaft 10 of the mixer through the hanger, make the connecting flange 9 and the driving flange 11 butt joint, then first insert a through bolt 13 from top to bottom through the bolt hole 12 corresponding to the driving flange 11 and the bolt hole 12 corresponding to the connecting flange 9, and then successively insert the remaining The through bolt 13 passes through the bolt hole 12 corresponding to the driving flange 11 and the bolt hole 12 corresponding to the connecting flange 9, and then the fastening nut 14 is screwed on to fix the driving flange 11 and the connecting flange 9 together. When the through bolt 13 passes through the bolt hole 12 corresponding to the driving flange 11 and the bolt hole 12 corresponding to the connecting flange 9 from top to bottom, the bolt holes 12 of the driving flange 11 and the connecting flange 9 are prone to misalignment, causing the bottom end of the through bolt 13 to press against the upper end surface of the slider 16. A tool is used to extend upward from the corresponding through groove 18 below the connecting flange 9 to contact the corresponding slider 16, and the slider 16 is moved by the tool to make it easier for the through bolt 13 to pass through the bolt hole 12 of the slider 16. After the KR stirring head is installed, the mixer moves downward so that the stirring column 6 and the stirring blade 7 are inserted into the molten iron for operation, quickly stirring the molten iron, accelerating the desulfurization reaction between the desulfurizer and the molten iron, and achieving the purpose of desulfurization pretreatment of the molten iron.

Claims

1. A KR stirring head steel structure for ladle pretreatment, characterized in that: The invention comprises a steel core column (1) located in the middle, the top end of the steel core column (1) is connected to a connecting head (2), a plurality of inner plates (3) are evenly and fixedly arranged at the bottom of the outer surface of the steel core column (1) along the radial direction, a plurality of anchoring nails (4) are fixedly arranged on the outer surface of the steel core column (1) and each inner plate (3), and a plurality of inner tooth grooves (5) are opened on the outer side surface of the inner plate (3) along the up and down direction.

2. The KR stirring head steel structure for ladle pretreatment according to claim 1 is characterized in that: The cross section of the inner tooth groove (5) is a trapezoidal structure, with the long side being inside the inner plate (3) and the short side being located on the outer side of the inner plate (3).

3. The KR stirring head steel structure for ladle pretreatment according to claim 2 is characterized in that: The inner plate (3) is provided with a plurality of through holes (8).

4. The KR stirring head steel structure for ladle pretreatment according to claim 3 is characterized in that: The connecting head (2) comprises a connecting flange (9) fixedly arranged at the top end of the steel core column (1), and a driving flange (11) fixedly arranged at the bottom end of the output shaft (10) of the mixer, and bolt holes (12) are provided on the driving flange (11) and the connecting flange (9), and through bolts (13) are passed through the bolt holes (12) corresponding to the driving flange (11) and the bolt holes (12) corresponding to the connecting flange (9), and the fastening nuts (14) are screwed on, so that the driving flange (11) and the connecting flange (9) are fixedly connected together.

5. The KR stirring head steel structure for ladle pretreatment according to claim 4 is characterized in that: The upper end surface of the connecting flange (9) is provided with an annular groove (15), a plurality of sliders (16) are slidably arranged in the annular groove (15) along the arc direction of the annular groove (15), the bolt holes (12) of the connecting flange (9) are arranged on the sliders (16), and the upper end surface of the connecting flange (9) is provided with a positioning device (17), the positioning device (17) is used to limit the position of each slider (16), so that each slider (16) can move within a set distance range.

6. The KR stirring head steel structure for ladle pretreatment according to claim 5 is characterized in that: A plurality of through grooves (18) are provided on the inner bottom wall of the annular groove (15) of the connecting flange (9) at positions corresponding to the sliding block (16); a positioning device (17) limits the sliding block (16) to be located at positions corresponding to the through grooves (18) in the annular groove (15).

7. The KR stirring head steel structure for ladle pretreatment according to claim 6 is characterized in that: The top ends of the bolt holes (12) of the sliding blocks (16) are all provided with chamfers (19).

8. The KR stirring head steel structure for ladle pretreatment according to claim 5 is characterized in that: The positioning device (17) comprises an outer fixing ring (20), the lower end surface of the outer fixing ring (20) is provided with a first arc-shaped sliding groove (21) communicating with the inner hole of the outer fixing ring (20), the upper part of the outer side surface of the sliding block (16) is protrudingly provided with an outer lip plate (22), the outer fixing ring (20) is fixed to the upper end surface of the connecting flange (9) by screws (23), the outer fixing ring (20) is located on the outer side of the annular groove (15), the outer lip plate (22) of each sliding block (16) is located in the first arc-shaped sliding groove (21) of the corresponding outer fixing ring (20), and the first arc-shaped sliding groove (21) of the outer fixing ring (20) is arranged corresponding to the bolt hole (12) of the driving flange (11).

9. The KR stirring head steel structure for ladle pretreatment according to claim 8, characterized in that: The positioning device (17) further comprises an inner fixing plate (24) fixedly arranged on the upper end surface of the connecting flange (9) located inside the annular groove (15); a plurality of second arcuate sliding grooves (25) corresponding to the first arcuate sliding grooves (21) are provided on the lower end surface of the inner fixing plate (24); an inner lip plate (26) is protrudingly arranged on the upper part of the inner side surface of the sliding block (16); the inner lip plate (26) is located in the corresponding second arcuate sliding groove (25); the second arcuate sliding groove (25) is concentric with the first arcuate sliding groove (21); the angular arcs of the first arcuate sliding groove (21) and the second arcuate sliding groove (25) are equal; and the two radial edges of the first arcuate sliding groove (21) and the two radial edges of the second arcuate sliding groove (25) coincide with each other.

10. The KR stirring head steel structure for ladle pretreatment according to claim 1, characterized in that: A circular plate (30) and a plurality of ribs (31) are evenly and fixedly arranged on the upper part of the outer surface of the steel core column (1) along the circumference, the bottom end of each rib (31) is fixedly arranged on the upper end face of the circular plate (30), and the upper end face of each rib (31) is fixedly arranged on the lower end face of the connecting flange (9).

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