Electromagnetic stirring tundish impact area protection plate

Abstract

The utility model discloses an electromagnetic stirring tundish impact area guard plate which is composed of a left guard plate and a right guard plate, the sides, close to molten steel, of the left guard plate and the right guard plate are the outer sides, the sides, away from the molten steel, of the left guard plate and the right guard plate are the inner sides, and the included angle A between the outer side plate faces of the left guard plate and the right guard plate and the horizontal plane is smaller than 90 degrees; each of the left protective plate and the right protective plate comprises a head-section protective plate, a first arc-shaped transition connecting section, a middle-section protective plate, a second arc-shaped transition connecting section and a tail-section protective plate; one end of the first arc-shaped transition connection section is connected with the head section protection plate, the other end of the first arc-shaped transition connection section is connected with the middle section protection plate, one end of the second arc-shaped transition connection section is connected with the middle section protection plate, and the other end of the second arc-shaped transition connection section is connected with the tail section protection plate; mounting grooves are formed in the outer side faces of the head section protection plates in the longitudinal direction, and the left protection plate and the right protection plate are connected with connecting pieces located between the head section protection plate of the left protection plate and the head section protection plate of the right protection plate in a clamped mode through the mounting grooves respectively. The induction coil can be protected in the impact area, the molten steel flow field in the tundish impact area is improved, and molten steel scouring is relieved.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic stirring tray technology. Specifically, it is a protective plate for the impact zone of an electromagnetic stirring tray. Background Technology

[0002] Electromagnetic stirring ladle utilizes the principle of a transformer. When the induction coil is energized with alternating current, it acts as a primary circuit, while the molten steel inside the ladle acts as a secondary circuit. This induces a current within the molten steel, forming a loop that compensates for heat loss in the molten steel. This facilitates mixing of the molten steel, resulting in a more uniform temperature distribution. Simultaneously, it promotes the flotation of inclusions in the molten steel in the impact and casting zones, optimizing the temperature and flow field distribution of the molten steel and allowing for precise control of the casting temperature. Since the induction coil is located in the impact zone of the ladle, a well-designed impact zone guard plate is necessary to surround the coil, reducing the erosion of the surrounding refractory material by the molten steel and extending the service life of the ladle. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to provide an electromagnetic stirring ladle impact zone protection plate that can protect the induction coil in the impact zone, improve the molten steel flow field in the impact zone of the ladle, and reduce the scouring of molten steel.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] An impact zone guard plate for an electromagnetic stirring ladle is composed of a left guard plate and a right guard plate. The side of the left guard plate and the right guard plate adjacent to the molten steel is the outer side, and the side away from the molten steel is the inner side. The angle A between the outer surface of the left guard plate and the right guard plate and the horizontal plane is less than 90°.

[0006] Both the left and right guard plates include a head section guard plate, a first arc-shaped transition connecting section, a middle section guard plate, a second arc-shaped transition connecting section, and a tail section guard plate. One end of the first arc-shaped transition connecting section is connected to the head section guard plate, and the other end is connected to the middle section guard plate. One end of the second arc-shaped transition connecting section is connected to the middle section guard plate, and the other end is connected to the tail section guard plate. A mounting groove is longitudinally formed on the outer side of the head section guard plate. The left and right guard plates are respectively engaged with the connectors located between the head section guard plates of the left and right guard plates through the mounting grooves.

[0007] The arc length of the first arc-shaped transition connecting section is 120-140 mm, the arc length of the second arc-shaped transition connecting section is 205-210 mm, and the centers of the first arc-shaped transition connecting section and the second arc-shaped transition connecting section are both located on the inner side.

[0008] The outer length L1 of the head section guard plate is less than the inner length L2 of the head section guard plate, the outer length L3 of the middle section guard plate is greater than the inner length L4 of the middle section guard plate, and the outer length L5 of the tail section guard plate is greater than the inner length L6 of the tail section guard plate.

[0009] On the outer side of the head section guard plate: the distance between the side elevation of the head section guard plate and the arc apex of the first arc-shaped transition connecting section is L7; on the inner side of the head section guard plate: the distance between the side elevation of the head section guard plate and the arc apex of the first arc-shaped transition connecting section is L8, where L7 is less than L8.

[0010] On the outer side of the middle section guard plate: the distance between the arc apex of the first arc-shaped transition connecting section and the arc apex of the second arc-shaped transition connecting section is L9; on the inner side of the middle section guard plate: the distance between the arc apex of the first arc-shaped transition connecting section and the arc apex of the second arc-shaped transition connecting section is L10, and L9 is greater than L10.

[0011] On the outer side of the tail section guard plate: the distance between the side elevation of the tail section guard plate and the arc apex of the second arc-shaped transition connecting section is L11. On the inner side of the tail section guard plate: the distance between the side elevation of the tail section guard plate and the arc apex of the second arc-shaped transition connecting section is L12, where L11 is greater than L12.

[0012] The impact zone guard plate of the electromagnetic stirring package mentioned above has the following dimensions: the outer length L1 of the head section guard plate is 228 mm and the inner length L2 is 295 mm; the outer length L3 of the middle section guard plate is 486 mm and the inner length L4 is 295 mm; and the outer length L5 of the tail section guard plate is 987 mm and the inner length L6 is 971 mm.

[0013] In the above-mentioned electromagnetic stirring, the impact zone guard plate has the following characteristics: on the outer side of the head section guard plate, the distance L7 between the side facade of the head section guard plate and the arc apex of the first arc-shaped transition connection section is 334mm; on the inner side of the head section guard plate, the distance L8 between the side facade of the head section guard plate and the arc apex of the first arc-shaped transition connection section is 345mm.

[0014] On the outer side of the middle section guard plate: the distance L9 between the arc apex of the first arc-shaped transition connecting section and the arc apex of the second arc-shaped transition connecting section is 643-645mm; on the inner side of the middle section guard plate: the distance L10 between the arc apex of the first arc-shaped transition connecting section and the arc apex of the second arc-shaped transition connecting section is 487mm.

[0015] On the outer side of the tail section guard plate: the distance L11 between the side elevation of the tail section guard plate and the arc apex of the second arc-shaped transition connecting section is 1096mm; on the inner side of the tail section guard plate: the distance L12 between the side elevation of the tail section guard plate and the arc apex of the second arc-shaped transition connecting section is 1080mm.

[0016] In the aforementioned electromagnetic stirring shock zone guard plate, the included angle B between the surface of the head guard plate and the surface of the middle guard plate is 155°, the included angle C between the surface of the middle guard plate and the surface of the tail guard plate is 140°, and the included angle A between the outer surfaces of the left and right guard plates and the horizontal plane is 85°.

[0017] In the aforementioned electromagnetic stirring, the impact zone guard plate has an arc radius R1 of 299mm for the first arc-shaped transition connection section and an arc radius R2 of 300mm for the second arc-shaped transition connection section.

[0018] The electromagnetic stirring in the above-mentioned impact zone guard plate has a bottom width M1 of 120mm, a groove opening width M2 of 131mm, and a guard plate thickness M3 of 60mm at the bottom of the groove.

[0019] In the aforementioned electromagnetic stirring process, the lower end face of the impact zone guard plate of the head section guard plate, the lower end face of the first arc-shaped transition connecting section, the lower end face of the middle section guard plate, the lower end face of the second arc-shaped transition connecting section, and the lower end face of a portion of the tail section guard plate adjacent to the second arc-shaped transition connecting section are flush with each other. The lower end face of the tail section guard plate, which is away from the second arc-shaped transition connecting section, is higher than the lower end face of the tail section guard plate adjacent to the second arc-shaped transition connecting section. The upper end face of the tail section guard plate, the upper end face of the second arc-shaped transition connecting section, the upper end face of the middle section guard plate, and the upper end face of a portion of the first arc-shaped transition connecting section adjacent to the middle section guard plate are flush with each other. The upper end face of the head section guard plate and the upper end face of a portion of the first arc-shaped transition connecting section adjacent to the head section guard plate are flush with each other and lower than the upper end face of the middle section guard plate.

[0020] In the aforementioned electromagnetic stirring process, the upper end face of the head section guard plate is 80mm lower than the upper end face of the middle section guard plate, and the lower end face of the tail section guard plate, which is far from the second arc-shaped transition connecting section, is 400mm higher than the lower end face of the tail section guard plate adjacent to the second arc-shaped transition connecting section.

[0021] The electromagnetic stirring liner impact zone guard plate mentioned above has a height of 1010mm, and lifting hooks are respectively provided on the upper end surfaces of the head section guard plate and the middle section guard plate.

[0022] In the aforementioned electromagnetic stirring, the impact zone guard plate has a slag line section at the top and a molten pool section at the bottom of the left and right guard plates. The slag line section on the middle section guard plate has a height H1 of 380 mm and a thickness H2 of 115 mm, or gradually decreases from 135 mm from top to bottom to the same thickness as the molten pool section. The slag line sections of the head section guard plate, the first arc-shaped transition connecting section, the second arc-shaped transition connecting section, and the tail section guard plate at the same height have the same thickness. The thickness H3 of the molten pool section is 85 mm.

[0023] The material used for the impact zone guard plate in the above-mentioned electromagnetic stirring is aluminum-magnesium alloy; or the material is magnesium alloy, which is formed by vibration casting of magnesium alloy castable by Puna Company, and the guard plate grade is TM-C (MgO+Al 2O3≥70% or MgO+Si O2≥70%).

[0024] The technical solution of this utility model has achieved the following beneficial technical effects:

[0025] 1. By implementing this utility model, the safe smelting of the electromagnetic stirring ladle can be effectively guaranteed. The two ends of the intermediate section guard plate are connected to the tail section guard plate and the head section guard plate respectively through arc transitions, which can reduce the force of molten steel directly impacting the guard plate due to the change of direction, making the stirring of the fluid in the ladle more fluid, reducing the scouring of the guard plate of the impact zone of the ladle by molten steel, optimizing the molten steel flow field, promoting the floating of inclusions, and improving the service life of the ladle.

[0026] 2. The top of the head section, middle section, and tail section guard plates are all equipped with slag lines. The thickened slag lines can resist the scouring and erosion of inclusions floating on the surface of molten steel, thus improving service life.

[0027] 3. The thickened slag line section is designed in two forms: a uniformly thickened slag line section and a gradually thickened slag line section. Although the uniformly thickened slag line section can improve the corrosion resistance, the right angle at the bottom will increase the impact force of molten steel. The gradually thickened slag line section can reduce the impact force of molten steel and improve the service life. Attached Figure Description

[0028] Figure 1 A schematic diagram of the main structure of the left protective plate in this utility model;

[0029] Figure 2 for Figure 1 The diagram shown is a rear view of the left guard plate of this utility model.

[0030] Figure 3 for Figure 1 The diagram shown is a top view of the left guard plate of this utility model.

[0031] Figure 4 for Figure 3The diagram shown is a cross-sectional view of the left guard plate of this utility model.

[0032] Figure 5 for Figure 3 The diagram shown is a cross-sectional view of the left guard plate of this utility model.

[0033] Figure 6 for Figure 1 The diagram shows a three-dimensional structural view of the left guard plate of this utility model at the first angle (hook omitted);

[0034] Figure 7 for Figure 1 The diagram shows a three-dimensional structural schematic of the left guard plate of this utility model at the second angle (hook omitted);

[0035] Figure 8 for Figure 1 The diagram shows a three-dimensional structural view of the left guard plate of this utility model at the third angle (hook omitted);

[0036] Figure 9 A schematic diagram of the main structure of the right guard plate in this utility model;

[0037] Figure 10 for Figure 9 The diagram shown is a rear view of the right guard plate of this utility model.

[0038] Figure 11 for Figure 9 The diagram shown is a top view of the right guard plate of this utility model.

[0039] Figure 12 for Figure 11 The diagram shown is a cross-sectional view of the right guard plate of this utility model.

[0040] Figure 13 for Figure 11 The diagram shown is a cross-sectional view of the right guard plate of this utility model.

[0041] Figure 14 for Figure 9 The diagram shows a three-dimensional structural schematic of the right guard plate of this utility model at the first angle (hook omitted);

[0042] Figure 15 for Figure 9 The diagram shows a three-dimensional structural schematic of the right guard plate of this utility model at the second angle (hook omitted);

[0043] Figure 16 for Figure 9 The diagram shows a three-dimensional structural view of the right guard plate of this utility model at the third angle (hook omitted);

[0044] Figure 17 When the thickness of the upper and lower parts of the slag line is equal Figure 3A schematic diagram of the AA cross-sectional structure of the left guard plate shown;

[0045] Figure 18 When the thickness of the upper and lower parts of the slag line is equal Figure 3 A schematic diagram of the BB cross-sectional structure of the left guard plate shown;

[0046] Figure 19 Original three-dimensional spatial model of the watershed;

[0047] Figure 20 Overall streamline diagram;

[0048] Figure 21 Velocity vector diagram of the symmetry plane;

[0049] Figure 22 Velocity vector diagram of the section where the stopper rod is located;

[0050] Figure 23 Liquid surface velocity contour map;

[0051] Figure 24 RTD curves for each stream.

[0052] The reference numerals in the figure are as follows: 1-left guard plate; 2-right guard plate; 3-head section guard plate; 4-middle section guard plate; 5-tail section guard plate; 6-installation groove; 7-slag line section; 8-hook; 9-first arc-shaped transition connection section; 10-second arc-shaped transition connection section; 11-molten pool section; 12-inner side; 13-outer side. Detailed Implementation

[0053] like Figure 7 and Figure 14 As shown, the impact zone guard plate of the electromagnetic stirring ladle in this embodiment consists of a left guard plate 1 and a right guard plate 2. The side of the left guard plate 1 and the right guard plate 2 adjacent to the molten steel is the outer side 13, and the side away from the molten steel is the inner side 12. The angle A between the outer surface of the left guard plate 1 and the right guard plate 2 and the horizontal plane is 85° [e.g., Figure 4 , Figure 5 , Figure 12 , Figure 13 , Figure 17 and Figure 18 As shown in the image.

[0054] like Figure 3 and Figure 11As shown, the left guard plate 1 and the right guard plate 2 are mirror-symmetrical. Both the left guard plate 1 and the right guard plate 2 include a head section guard plate 3, a first arc-shaped transition connecting section 9, a middle section guard plate 4, a second arc-shaped transition connecting section 10, and a tail section guard plate 5. One end of the first arc-shaped transition connecting section 9 is connected to the head section guard plate 3, and the other end is connected to the middle section guard plate 4. One end of the second arc-shaped transition connecting section 10 is connected to the middle section guard plate 4, and the other end is connected to the tail section guard plate 5. In the head section guard plate... A mounting groove 6 is longitudinally formed on the outer side of plate 3. The left guard plate 1 and the right guard plate 2 are respectively connected to the connectors located between the head section guard plate 3 of the left guard plate 1 and the head section guard plate 3 of the right guard plate 2 through the mounting groove 6. The arc length of the first arc-shaped transition connecting section 9 is 120-140mm, the arc length of the second arc-shaped transition connecting section 10 is 205-210mm, and the centers of the first arc-shaped transition connecting section 9 and the second arc-shaped transition connecting section 10 are both located on the inner side.

[0055] like Figure 3 As shown, the outer length L1 of the head section guard plate 3 is less than the inner length L2 of the head section guard plate 3, the outer length L3 of the middle section guard plate 4 is greater than the inner length L4 of the middle section guard plate 4, and the outer length L5 of the tail section guard plate 5 is greater than the inner length L6 of the tail section guard plate 5.

[0056] On the outer side of the head section guard plate 3: the distance between the side elevation of the head section guard plate 3 and the arc apex of the first arc-shaped transition connecting section 9 is L7; on the inner side of the head section guard plate 3: the distance between the side elevation of the head section guard plate 3 and the arc apex of the first arc-shaped transition connecting section 9 is L8, where L7 is less than L8.

[0057] On the outer side of the middle section guard plate 4: the distance between the arc apex of the first arc-shaped transition connecting section 9 and the arc apex of the second arc-shaped transition connecting section 10 is L9; on the inner side of the middle section guard plate 4: the distance between the arc apex of the first arc-shaped transition connecting section 9 and the arc apex of the second arc-shaped transition connecting section 10 is L10, and L9 is greater than L10.

[0058] On the outer side of the tail section guard plate 5: the distance between the side elevation of the tail section guard plate 5 and the arc apex of the second arc-shaped transition connecting section 10 is L11. On the inner side of the tail section guard plate 5: the distance between the side elevation of the tail section guard plate 5 and the arc apex of the second arc-shaped transition connecting section 10 is L12. L11 is greater than L12.

[0059] In this embodiment, as Figure 3 and Figure 11As shown, the outer length L1 of the head section guard plate 3 is 228mm and the inner length L2 is 295mm; the outer length L3 of the middle section guard plate 4 is 486mm and the inner length L4 is 295mm; the outer length L5 of the tail section guard plate 5 is 987mm and the inner length L6 is 971mm. The distance L7 between the side facade of the head section guard plate 3 and the arc apex of the first arc-shaped transition connecting section 9 is 334mm; the distance L8 between the side facade of the head section guard plate 3 and the arc apex of the first arc-shaped transition connecting section 9 is 345mm; the distance L9 between the arc apex of the first arc-shaped transition connecting section 9 and the arc apex of the second arc-shaped transition connecting section 10 is 643-645mm. On the inner side of section 4: the distance L10 between the apex of the first arc-shaped transition connecting section 9 and the apex of the second arc-shaped transition connecting section 10 is 487mm; on the outer side of the tail section guard plate 5: the distance L11 between the side profile of the tail section guard plate 5 and the apex of the second arc-shaped transition connecting section 10 is 1096mm; on the inner side of the tail section guard plate 5: the distance L12 between the side profile of the tail section guard plate 5 and the apex of the second arc-shaped transition connecting section 10 is 1080mm. The included angle B between the surface of the head section guard plate 3 and the surface of the middle section guard plate 4 is 155°; the included angle C between the surface of the middle section guard plate 4 and the surface of the tail section guard plate 5 is 140°; and the included angle A between the outer surfaces of the left guard plate 1 and the right guard plate 2 and the horizontal plane is 85°. The radius of the arc of the first arc-shaped transition connecting section 9 is 299mm, and the radius of the arc of the second arc-shaped transition connecting section 10 is 300mm. The bottom width M1 of the mounting groove 6 is 120mm, the opening width M2 is 131mm, and the thickness of the protective plate at the bottom of the groove is 60mm.

[0060] like Figure 1 , Figure 2 , Figure 9 and Figure 10As shown, the lower end face of the head section guard plate 3, the lower end face of the first arc-shaped transition connecting section 9, the lower end face of the middle section guard plate 4, the lower end face of the second arc-shaped transition connecting section 10, and the lower end face of a portion of the tail section guard plate 5 adjacent to the second arc-shaped transition connecting section 10 are flush with each other. The lower end face of the tail section guard plate 5 away from the second arc-shaped transition connecting section 10 is higher than the lower end face of the tail section guard plate 5 adjacent to the second arc-shaped transition connecting section 10. The upper end face of the tail section guard plate 5, the upper end face of the second arc-shaped transition connecting section 10, the upper end face of the middle section guard plate 4, and the upper end face of a portion of the first arc-shaped transition connecting section 9 adjacent to the middle section guard plate 4 are flush with each other. The upper end face of the head section guard plate 3 and the upper end face of a portion of the first arc-shaped transition connecting section 9 adjacent to the head section guard plate 3 are flush with each other and lower than the upper end face of the middle section guard plate 4. The upper surface of the head section guard plate 3 is 80mm lower than the upper surface of the middle section guard plate 4, and the lower surface of the tail section guard plate 5, which is away from the second arc-shaped transition connecting section 10, is 400mm higher than the lower surface of the tail section guard plate 5 adjacent to the second arc-shaped transition connecting section 10. The height of the impact zone guard plate of the electromagnetic stirring ladle is 1010mm, and lifting hooks 8 are respectively provided on the upper surfaces of the head section guard plate 3 and the middle section guard plate 4.

[0061] like Figure 4 , Figure 5 , Figure 12 , Figure 13 , Figure 17 and Figure 18 As shown, the upper part of the left guard plate 1 and the right guard plate 2 is the slag line section 7, and the lower part is the molten pool section 11. The height H1 of the slag line section 7 on the middle section guard plate 4 is 380mm, and the thickness H2 is 115mm, or gradually decreases from 135mm from top to bottom to the same thickness as the molten pool section 11. The slag line sections 7 of the head section guard plate 3, the first arc-shaped transition connecting section 9, the second arc-shaped transition connecting section 10, and the tail section guard plate 5 at the same height have the same thickness. The thickness H3 of the molten pool section 11 is 85mm.

[0062] 1. This embodiment can effectively ensure the safe smelting of the electromagnetic stirring ladle. The two ends of the intermediate section guard plate are connected to the tail section guard plate and the head section guard plate through arc transitions, which can reduce the force of the molten steel directly impacting the guard plate due to the change of direction, making the stirring of the fluid in the ladle more fluid field, reducing the scouring of the guard plate of the impact zone of the ladle by the molten steel, optimizing the molten steel flow field, promoting the floating of inclusions, and improving the service life of the ladle.

[0063] 2. The top of the head section, middle section, and tail section guard plates are all equipped with slag lines. The thickened slag lines can resist the scouring and erosion of inclusions floating on the surface of molten steel, thus improving service life.

[0064] 3. The thickened slag line section is designed in two forms: a uniformly thickened slag line section and a gradually thickened slag line section. Although the uniformly thickened slag line section can improve the corrosion resistance, the right angle at the bottom will increase the impact force of molten steel. The gradually thickened slag line section can reduce the impact force of molten steel and improve the service life.

[0065] use In this embodiment, the impact zone guard plate Simulation test of flow field in the middle package

[0066] I. The specific parameters of the experiment are shown in Table 1 below:

[0067] Table 1 Parameters required for the experiment

[0068] name parameter billet dimensions 280mm×380mm Pulling speed 0.62 m / min~0.85 m / min Long water inlet inner and outer diameter 75mm / 135mm Working fluid level 700mm~850mm Long water inlet insertion depth 200mm~300mm

[0069] II. Simulation Analysis

[0070] 2.1 CAD Digital Object Modeling

[0071] The flow field is calculated as a spatial domain filled with fluid, so the CAD model is a complex geometry of a region filled with molten steel. Considering the symmetry of the flow domain, half of the flow domain is taken as the calculation object, and the symmetry plane is treated using numerically symmetric boundaries. The original three-dimensional spatial model of the flow domain is as follows: Figure 19 As shown:

[0072] 2.2 CAE Digital Object Modeling

[0073] The test object was divided into tetrahedral meshes, with a mesh size of approximately 750,000.

[0074] 2.3 CAE Model

[0075] This experiment uses Stokes' equations to describe the flow phenomenon of molten steel. The calculation method adopts the finite volume method, and the k-ε two-equation mathematical model is used to describe the turbulent flow characteristics of molten steel. The turbulent flow in the near-wall region is handled by an optimized wall function.

[0076] 2.4 Boundary Conditions

[0077] Based on the on-site operating conditions of the test subject, boundary conditions were set. Please see the table below for details:

[0078] Table 2 Boundary Conditions

[0079] area Boundary conditions parameter Entrance Speed ​​Entry Speed ​​is calculated from the throwing parameters Free surface Free sliding wall Intermediate wall Non-slip wall Symmetry plane Symmetrical boundary exit Open Borders The relative pressure is 0

[0080] III. Results of molten steel flow field in the tundish

[0081] To visually represent the flow field results, both streamline diagrams and vector diagrams are used to describe the calculation results, as detailed below:

[0082] 3.1 The overall streamline diagram is as follows: Figure 20 As shown.

[0083] 3.2, Velocity vector diagram of the symmetry plane, as shown below. Figure 21 As shown.

[0084] 3.3, The velocity vector diagram of the section where the stopper rod is located is as follows: Figure 22 As shown.

[0085] 3.4. Liquid surface velocity contour plot as shown Figure 23 As shown.

[0086] IV. Analysis of Experimental Results

[0087] 4.1 RTD curve analysis as follows Figure 24 As shown in Table 3, the results of the RTD curve analysis are as follows.

[0088] Table 3. Results of RTD curve analysis

[0089]

[0090] 4.2 Analysis of impurity removal rate is shown in Table 4.

[0091] Table 4 Calculation results of impurity removal rate

[0092]

[0093] In this embodiment, the impact zone guard plate, when used in conjunction with the guide pipe in the tundish, further optimizes the tundish flow field, improves the inclusion removal rate, and thus improves the steel quality. This structure improves the removal of inclusions of different particle sizes to a certain extent, especially for large-particle inclusions, where the improvement is more significant. Overall, the residence time of molten steel in each stream using this structure represents another beneficial attempt to eliminate dead zones, with the overall average residence time and dead zone volume being almost identical.

[0094] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A shield for the impact zone of an electromagnetic stirring ladle, characterized in that: It is composed of a left guard plate (1) and a right guard plate (2), wherein the side of the left guard plate (1) and the right guard plate (2) adjacent to the molten steel is an outer side (13), and the side facing away from the molten steel is an inner side (12), and the angle A between the outer plate surfaces of the left guard plate (1) and the right guard plate (2) and the horizontal plane is less than 90°; The left guard plate (1) and the right guard plate (2) both comprise a head guard plate (3), a first arc-shaped transition connection section (9), a middle guard plate (4), a second arc-shaped transition connection section (10) and a tail guard plate (5); one end of the first arc-shaped transition connection section (9) is connected to the head guard plate (3) and the other end is connected to the middle guard plate (4); one end of the second arc-shaped transition connection section (10) is connected to the middle guard plate (4) and the other end is connected to the tail guard plate (5); a mounting groove (6) is provided on the outer side surface of the head guard plate (3) in the longitudinal direction, and the left guard plate (1) and the right guard plate (2) are respectively connected to the connecting piece located between the head guard plate (3) of the left guard plate (1) and the head guard plate (3) of the right guard plate (2) through the mounting groove (6); The arc length of the first arc-shaped transition connecting section (9) is 120 to 140 mm, the arc length of the second arc-shaped transition connecting section (10) is 205 to 210 mm, and the centers of the first arc-shaped transition connecting section (9) and the second arc-shaped transition connecting section (10) are both located inside; The outer length L1 of the head section guard plate (3) is smaller than the inner length L2 of the head section guard plate (3), the outer length L3 of the middle section guard plate (4) is larger than the inner length L4 of the middle section guard plate (4), and the outer length L5 of the tail section guard plate (5) is larger than the inner length L6 of the tail section guard plate (5); On the outside of the head section guard plate (3), the distance between the side elevation of the head section guard plate (3) and the top of the arc of the first arc-shaped transition connecting section (9) is L7; on the inside of the head section guard plate (3), the distance between the side elevation of the head section guard plate (3) and the top of the arc of the first arc-shaped transition connecting section (9) is L8, and L7 is smaller than L8; On the outer side of the middle section guard plate (4), the distance between the arc top of the first arc-shaped transition connecting section (9) and the arc top of the second arc-shaped transition connecting section (10) is L9; on the inner side of the middle section guard plate (4), the distance between the arc top of the first arc-shaped transition connecting section (9) and the arc top of the second arc-shaped transition connecting section (10) is L10, and L9 is greater than L10; On the outer side of the tail section guard plate (5), the distance between the side elevation of the tail section guard plate (5) and the arc top of the second arc-shaped transition connecting section (10) is L11; on the inner side of the tail section guard plate (5), the distance between the side elevation of the tail section guard plate (5) and the arc top of the second arc-shaped transition connecting section (10) is L12, and L11 is greater than L12.

2. The electromagnetic stirring ladle impact zone guard plate according to claim 1, characterized in that: The outer length L1 of the head section guard plate (3) is 228 mm, and the inner length L2 is 295 mm. The outer length L3 of the middle section guard plate (4) is 486 mm, and the inner length L4 is 295 mm. The outer length L5 of the tail section guard plate (5) is 987 mm, and the inner length L6 is 971 mm.

3. The electromagnetic stirring ladle impact zone guard plate according to claim 1, characterized in that: On the outside of the head section guard plate (3), the distance L7 between the side elevation of the head section guard plate (3) and the arc top of the first arc-shaped transition connecting section (9) is 334 mm; on the inside of the head section guard plate (3), the distance L8 between the side elevation of the head section guard plate (3) and the arc top of the first arc-shaped transition connecting section (9) is 345 mm; On the outer side of the middle section guard plate (4), the distance L9 between the arc top of the first arc-shaped transition connecting section (9) and the arc top of the second arc-shaped transition connecting section (10) is 643-645 mm, and on the inner side of the middle section guard plate (4), the distance L10 between the arc top of the first arc-shaped transition connecting section (9) and the arc top of the second arc-shaped transition connecting section (10) is 487 mm. On the outer side of the tail section guard plate (5), the distance L11 between the side elevation of the tail section guard plate (5) and the arc top of the second arc-shaped transition connecting section (10) is 1096 mm, and on the inner side of the tail section guard plate (5), the distance L12 between the side elevation of the tail section guard plate (5) and the arc top of the second arc-shaped transition connecting section (10) is 1080 mm.

4. The electromagnetic stirring ladle impact zone guard plate according to claim 1, characterized in that: The included angle B between the plate surface of the head section guard plate (3) and the plate surface of the middle section guard plate (4) is 155°, the included angle C between the plate surface of the middle section guard plate (4) and the plate surface of the tail section guard plate (5) is 140°, and the included angle A between the outer plate surfaces of the left guard plate (1) and the right guard plate (2) and the horizontal plane is 85°.

5. The electromagnetic stirring ladle impact zone guard plate according to claim 1, characterized in that: The arc radius R1 of the first arc-shaped transition connecting section (9) is 299 mm, and the arc radius R2 of the second arc-shaped transition connecting section (10) is 300 mm.

6. The electromagnetic stirring ladle impact zone guard plate according to claim 1, characterized in that: The groove bottom width M1 of the installation groove (6) is 120 mm, the groove opening width M2 is 131 mm, and the thickness M3 of the guard plate at the groove bottom is 60 mm.

7. The electromagnetic stirring ladle impact zone guard plate according to claim 1, characterized in that: The lower end surface of the head section guard plate (3), the lower end surface of the first arc-shaped transition connecting section (9), the lower end surface of the middle section guard plate (4), the lower end surface of the second arc-shaped transition connecting section (10) and the lower end surface of a portion of the tail section guard plate (5) adjacent to the second arc-shaped transition connecting section (10) are flush with each other, and the lower end surface of the tail section guard plate (5) away from the second arc-shaped transition connecting section (10) is higher than the lower end surface of the tail section guard plate (5) adjacent to the second arc-shaped transition connecting section (10). The lower end surface of the plate (5); the upper end surface of the tail section guard plate (5), the upper end surface of the second arc-shaped transition connecting section (10), the upper end surface of the middle section guard plate (4) and the upper end surface of a portion of the first arc-shaped transition connecting section (9) adjacent to the middle section guard plate (4) are flush; the upper end surface of the head section guard plate (3) and the upper end surface of a portion of the first arc-shaped transition connecting section (9) adjacent to the head section guard plate (3) are flush and lower than the upper end surface of the middle section guard plate (4).

8. The electromagnetic stirring ladle impact zone guard plate according to claim 7, characterized in that: The upper end surface of the head section guard plate (3) is 80 mm lower than the upper end surface of the middle section guard plate (4), and the lower end surface of the tail section guard plate (5) away from the second arc-shaped transition connection section (10) is 400 mm higher than the lower end surface of the tail section guard plate (5) adjacent to the second arc-shaped transition connection section (10).

9. The electromagnetic stirring ladle impact zone guard plate according to claim 1, characterized in that: The height of the electromagnetic stirring ladle impact zone guard plate is 1010 mm, and lifting hooks (8) are respectively arranged on the upper end surfaces of the head section guard plate (3) and the middle section guard plate (4).

10. The electromagnetic stirring ladle impact zone guard plate according to claim 1, characterized in that: The upper part of the left guard plate (1) and the right guard plate (2) is a slag line part (7), and the lower part is a molten pool part (11); the slag line part (7) on the middle guard plate (4) has a height H1 of 380 mm and a thickness H2 of 115 mm or gradually decreases from 135 mm from top to bottom to the same thickness as the molten pool part (11); the slag line part (7) at the same height of the head guard plate (3), the first arc-shaped transition connecting section (9), the second arc-shaped transition connecting section (10) and the tail guard plate (5) has the same thickness, and the thickness H3 of the molten pool part (11) is 85 mm.

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