Working layer guard plate of electromagnetic stirring tundish

Abstract

The utility model discloses an electromagnetic stirring tundish working layer protective plate which is composed of a left protective plate and a right protective plate, and each of the left protective plate and the right protective plate comprises a head-section protective plate, a first arc-shaped transition connecting protective plate, a middle-section protective plate, a second arc-shaped transition connecting protective plate and a tail-section protective plate. One end of the middle-section protective plate is connected with the head-section protective plate through a first arc-shaped transition connecting protective plate, and the other end of the middle-section protective plate is connected with the tail-section protective plate through a second arc-shaped transition connecting protective plate; from the upper end face to the lower end face, the head-section protection plate and the middle-section protection plate are each composed of a slag line part and a molten pool part, the tail-section protection plate is composed of a slag line part, a molten pool part and an abutting part, the thickness of the slag line part is larger than that of the molten pool part, and the thickness of the abutting part is larger than that of the molten pool part and smaller than or equal to the maximum thickness of the slag line part; and the side vertical surface of the tail-section protecting plate of the left protecting plate is butted with the side vertical surface of the tail-section protecting plate of the right protecting plate to form the working layer protecting plate of the electromagnetic stirring tundish. The utility model can improve the molten steel flow field in the tundish, prolong the service life and ensure the safe smelting of the electromagnetic stirring tundish.

Description

Technical Field

[0001] The utility model relates to the technical field of steel smelting, and is specifically a working layer guard plate for an electromagnetic stirring ladle. Background Art

[0002] The electromagnetic stirring tundish working layer guard plate is located between the molten steel impact zone and the molten steel pouring zone, with one side facing the pouring zone and contacting the molten steel in the pouring zone, optimizing the molten steel flow field in the pouring zone, and bearing the erosion of the molten steel in the pouring zone, and the other side facing the molten steel impact zone and protecting the electromagnetic inductor. Therefore, it is necessary to develop a reasonably structured electromagnetic stirring tundish working layer guard plate to improve the molten steel flow field in the tundish and effectively ensure the safe smelting of the electromagnetic stirring tundish. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to provide an electromagnetic stirring tundish working layer guard plate which can improve the molten steel flow field in the tundish, increase the service life and ensure the safe smelting of the electromagnetic stirring tundish.

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

[0005] A working layer guard plate of an electromagnetic stirring ladle, composed of a left guard plate and a right guard plate, wherein the left guard plate and the right guard plate each include a head section guard plate, a first arc-shaped transition connecting guard plate, a middle section guard plate, a second arc-shaped transition connecting guard plate and a tail section guard plate, wherein the center of the first arc-shaped transition connecting guard plate is located on a side of the electromagnetic stirring ladle working layer guard plate adjacent to molten steel, and the center of the second arc-shaped transition connecting guard plate is located on a side of the electromagnetic stirring ladle working layer guard plate away from molten steel; the head section guard plate and the tail section guard plate have the same height, and the height of the middle section guard plate from the top end to the bottom end, the height of a part of the middle section guard plate adjacent to the middle section guard plate The height of the first arc-shaped transition connecting guard plate from the top to the bottom, and the height of a portion of the second arc-shaped transition connecting guard plate adjacent to the middle section guard plate from the top to the bottom are respectively smaller than the height of the head section guard plate and the tail section guard plate from the top to the bottom, so that a mounting notch is formed between the head section guard plate and the tail section guard plate, the upper end surfaces of the head section guard plate, the first arc-shaped transition connecting guard plate, the middle section guard plate, the second arc-shaped transition connecting guard plate and the tail section guard plate are flush and parallel to the horizontal ground, and the lower end surfaces of the head section guard plate and the tail section guard plate are flush and parallel to the horizontal ground; One end of the middle section guard plate is connected to the head section guard plate through the first arc transition connecting guard plate, and the other end is connected to the tail section guard plate through the second arc transition connecting guard plate; the sides of the head section guard plate, the middle section guard plate and the tail section guard plate away from the molten steel are outer sides and are all planes, and the angle A between the outer side surface of the head section guard plate and the lower end surface, the angle B between the outer side surface of the tail section guard plate and the lower end surface, and the angle C between the outer side surface of the middle section guard plate and the upper end surface increase in sequence; from the upper end surface to the lower end surface: the head section guard plate, the first arc transition connecting guard plate The guard plate, the middle guard plate and a part of the second arc-shaped transition connecting guard plate away from the tail guard plate are all composed of a slag line portion and a molten pool portion, the tail guard plate and a part of the second arc-shaped transition connecting guard plate adjacent to the tail guard plate are all composed of a slag line portion, a molten pool portion and a supporting portion, the thickness of the slag line portion is greater than the thickness of the molten pool portion, the thickness of the supporting portion is greater than the thickness of the molten pool portion and is less than or equal to the maximum thickness of the slag line portion; the side elevation of the tail guard plate of the left guard plate is connected with the side elevation of the tail guard plate of the right guard plate to form the electromagnetic stirring mid-package working layer guard plate.

[0006] In the electromagnetic stirring working layer guard plate, the angle A between the outer side surface of the head section guard plate and the lower end surface is 80°, the angle B between the outer side surface of the tail section guard plate and the lower end surface is 85°, and the angle C between the outer side surface of the middle section guard plate and the upper end surface is 95°.

[0007] In the electromagnetic stirring middle package working layer guard plate, the thickness of the molten pool part is equal at all places, and the thickness of the molten pool part of the head section guard plate, the middle section guard plate and the tail section guard plate are all equal.

[0008] In the electromagnetic stirring working layer guard plate, the thickness of the slag line portion gradually decreases to be equal to the thickness of the molten pool portion from the upper end surface to the molten pool portion; or the thickness of the slag line portion is equal at all locations from the upper end surface to the molten pool portion.

[0009] The electromagnetic stirring middle package working layer guard plate has a thickness of 85 mm at all locations in the molten pool.

[0010] In the above-mentioned electromagnetic stirring middle bag working layer guard plate, from the upper end surface to the molten pool portion: the thickness of the slag line portion gradually decreases from 130mm to the same as the thickness of the molten pool portion; or from the upper end surface to the molten pool portion: the thickness of the slag line portion is 110mm at all locations; the depth of the slag line portion is 300mm; the depth of the abutment portion is 85mm, and the thickness of the abutment portion is 130mm at all locations.

[0011] In the working layer guard plate of the electromagnetic stirring ladle, the angle D between the middle section guard plate and the tail section guard plate is 155°, and the arc radius R2 of the second arc-shaped transition connecting guard plate is 299mm; the angle E between the head section guard plate and the middle section guard plate is 152°, and the arc radius R1 of the first arc-shaped transition connecting guard plate is 524mm; a slot is provided on the upper end surface of the tail section guard plate, and lifting hooks are respectively provided on both sides of the slot, the bottom length of the slot is 200mm, the slot length is 220mm, and the distance between the slot of the slot and the side elevation of the tail section guard plate is 970mm.

[0012] The working layer guard plate of the electromagnetic stirring ladle has a left guard plate height of 990 mm and a top length of 2405 mm. On the outside of the top of the left guard plate: the distance between the vertical surface of the head section guard plate and the arc top of the first arc-shaped transition connecting guard plate is 335 mm, the distance between the arc top of the first arc-shaped transition connecting guard plate and the arc top of the second arc-shaped transition connecting guard plate is 450 mm, and the distance between the vertical surface of the tail section guard plate and the arc top of the second arc-shaped transition connecting guard plate is 1630 mm.

[0013] On the inner side of the top of the left guard plate: the distance between the vertical surface of the head section guard plate and the arc top of the first arc-shaped transition connecting guard plate is 343 mm, the distance between the arc top of the first arc-shaped transition connecting guard plate and the arc top of the second arc-shaped transition connecting guard plate is 445 mm, and the distance between the vertical surface of the tail section guard plate and the arc top of the second arc-shaped transition connecting guard plate is 1645 mm;

[0014] On the outside of the bottom end of the left guard plate: the length of the head section guard plate is 260 mm, the distance between the head section guard plate and the tail section guard plate is 407 mm, and the length of the tail section guard plate is 1629 mm;

[0015] On the inner side of the bottom end of the left guard plate: the length of the head section guard plate is 260 mm, the distance between the head section guard plate and the tail section guard plate is 407 mm, and the length of the tail section guard plate is 1658 mm.

[0016] The working layer guard plate of the electromagnetic stirring ladle has a right guard plate height of 990 mm and a top length of 2405 mm. On the outside of the top of the right guard plate: the distance between the vertical surface of the head section guard plate and the arc top of the first arc-shaped transition connecting guard plate is 335 mm, the distance between the arc top of the first arc-shaped transition connecting guard plate and the arc top of the second arc-shaped transition connecting guard plate is 450 mm, and the distance between the vertical surface of the tail section guard plate and the arc top of the second arc-shaped transition connecting guard plate is 1730 mm.

[0017] On the inner side of the top of the right guard plate: the distance between the vertical surface of the head section guard plate and the arc top of the first arc-shaped transition connecting guard plate is 343 mm, the distance between the arc top of the first arc-shaped transition connecting guard plate and the arc top of the second arc-shaped transition connecting guard plate is 445 mm, and the distance between the vertical surface of the tail section guard plate and the arc top of the second arc-shaped transition connecting guard plate is 1745 mm;

[0018] On the outside of the bottom end of the right guard plate: the length of the head section guard plate is 260 mm, the distance between the head section guard plate and the tail section guard plate is 407 mm, and the length of the tail section guard plate is 1729 mm;

[0019] On the inner side of the bottom end of the right guard plate: the length of the head section guard plate is 260 mm, the distance between the head section guard plate and the tail section guard plate is 407 mm, and the length of the tail section guard plate is 1758 mm.

[0020] In the electromagnetic stirring middle pack working layer guard plate, the height between the lower bottom surface of the middle section guard plate and the lower end surface is 480 mm.

[0021] The refractory material of the electromagnetic stirring working layer guard plate is aluminum-magnesium or MgO+Al2O3≥70% or MgO+SiO2≥70%

[0022] The technical solution of the utility model has achieved the following beneficial technical effects:

[0023] 1. The utility model can effectively ensure the safe smelting of the electromagnetic stirring ladle. The two ends of the middle section guard plate are respectively the head section guard plate and the tail section guard plate are connected by arc transition. The setting of the arc transition connection can reduce the stress in the plate, reduce the impact force exerted on the guard plate by the molten steel due to the change of direction, optimize the flow field of the molten steel in the ladle, even the temperature and composition of the molten steel, and improve the inclusion removal rate and product quality.

[0024] 2. A support portion is provided on the inner side of the tail section guard plate. The provision of the support portion enables the guard plate to be more reliably installed inside the middle package.

[0025] 3. Slag lines are set on the inner sides of the top ends of the head guard plate, arc-shaped transition connecting plate, middle guard plate and tail guard plate. The thickened slag lines can resist the erosion of floating slag on the surface of molten steel and improve service life.

[0026] 4. The thickened slag line has two structural forms, a uniformly thickened slag line and a gradually thickened slag line. Although the uniformly thickened slag line can improve the corrosion resistance, the right angle at the bottom will increase the internal stress of the guard plate and cannot effectively buffer the impact of the molten steel. The gradually thickened slag line can reduce the internal stress of the guard plate and reduce the impact of the molten steel, further improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the main structure of the left guard plate in the utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure of the left guard plate from a top view;

[0029] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure of the left guard plate shown;

[0030] Figure 4 for Figure 1 Another perspective structural diagram of the left guard plate shown;

[0031] Figure 5a for Figure 2 A structural schematic diagram of the AA section of a left guard plate is shown;

[0032] Figure 5b for Figure 2 A structural schematic diagram of a left guard plate BB section is shown;

[0033] Figure 5c for Figure 2 A structural schematic diagram of a left guard plate CC section is shown;

[0034] Figure 6a for Figure 2 Another structural schematic diagram of the left guard plate AA section of the slag line structure is shown;

[0035] Figure 6b for Figure 2 Another structural schematic diagram of the left guard plate BB section of the slag line structure is shown;

[0036] Figure 6c for Figure 2Another structural schematic diagram of the CC section of the left guard plate of the slag line structure is shown;

[0037] Figure 7 A schematic diagram of the main structure of the right guard plate in the utility model;

[0038] Figure 8 for Figure 7 A schematic diagram of the top view of the right guard plate shown;

[0039] Fig. 9 for Figure 7 A schematic diagram of the three-dimensional structure of the right guard plate shown;

[0040] Fig.10 for Figure 7 Another perspective structural diagram of the right guard plate shown;

[0041] Fig.11a for Figure 8 A structural schematic diagram of a right guard plate AA section is shown;

[0042] Fig.11b for Figure 8 A structural schematic diagram of a right guard plate BB section is shown;

[0043] Fig.11c for Figure 8 A structural schematic diagram of a right guard plate CC section is shown;

[0044] Fig.12a for Figure 8 Another structural schematic diagram of the right guard plate AA section of the slag line structure is shown;

[0045] Figure 12b for Figure 8 Another structural schematic diagram of the right guard plate BB section of the slag line structure is shown;

[0046] Fig.12c for Figure 8 Another structural schematic diagram of the right guard plate CC section of the slag line structure is shown;

[0047] Fig.13 Original three-dimensional spatial model of the watershed;

[0048] Fig.14 Overall flow diagram;

[0049] Fig.15 Velocity vector diagram of symmetry surface;

[0050] Fig.16 Velocity vector diagram of the cross section where the stopper rod is located;

[0051] Fig.17 Liquid surface velocity cloud diagram;

[0052] Fig.18 RTD curves for each stream.

[0053] The reference numerals in the figure are as follows: 1-left guard plate; 2-right guard plate; 3-head guard plate; 4-middle guard plate; 5-tail guard plate; 6-slot; 7-outer side; 8-installation notch; 9-hook; 10-first arc-shaped transition connecting guard plate; 11-second arc-shaped transition connecting guard plate; 12-upper end surface; 13-lower end surface; 14-slag line portion; 15-molten pool portion; 16-rest portion. DETAILED DESCRIPTION

[0054] like Figures 1 to 4 and Figures 7 to 10As shown, the electromagnetic stirring ladle working layer guard plate of the utility model is composed of a left guard plate 1 and a right guard plate 2. The left guard plate 1 and the right guard plate 2 both include a head section guard plate 3, a first arc-shaped transition connecting guard plate 10, a middle section guard plate 4, a second arc-shaped transition connecting guard plate 11 and a tail section guard plate 5. The center of the first arc-shaped transition connecting guard plate 10 is located on the side of the electromagnetic stirring ladle working layer guard plate adjacent to the molten steel, and the center of the second arc-shaped transition connecting guard plate 11 is located on the side of the electromagnetic stirring ladle working layer guard plate away from the molten steel; the head section guard plate 3 and the tail section guard plate 5 have the same height, the middle section guard plate 4 has a height from the top to the bottom, and a part of the first arc-shaped transition connecting guard plate 4 adjacent to the middle section guard plate 4 The height of the arc-shaped transition connecting guard plate 10 from the top to the bottom, and the height of a portion of the second arc-shaped transition connecting guard plate 11 adjacent to the middle section guard plate 4 from the top to the bottom are respectively smaller than the height of the head section guard plate 3 and the tail section guard plate 5 from the top to the bottom so that an installation notch 8 is formed between the head section guard plate 3 and the tail section guard plate 5, the upper end surfaces 12 of the head section guard plate 3, the first arc-shaped transition connecting guard plate 10, the middle section guard plate 4, the second arc-shaped transition connecting guard plate 11 and the tail section guard plate 5 are flush and parallel to the horizontal ground, and the lower end surfaces 13 of the head section guard plate 3 and the tail section guard plate 5 are flush and parallel to the horizontal ground; One end is connected to the head section guard plate 3 through the first arc transition connecting guard plate 10, and the other end is connected to the tail section guard plate 5 through the second arc transition connecting guard plate 11; the sides of the head section guard plate 3, the middle section guard plate 4 and the tail section guard plate 5 away from the molten steel are outer side surfaces 7 and are all planes, and the angle A between the outer side surface 7 of the head section guard plate 3 and the lower end surface 13, the angle B between the outer side surface 7 of the tail section guard plate 5 and the lower end surface 13, and the angle C between the outer side surface 7 of the middle section guard plate 4 and the upper end surface 12 increase successively; from the upper end surface 12 to the lower end surface 13: the head section guard plate 3, the first arc transition connecting guard plate 10, the The middle section guard plate 4 and a part of the second arc-shaped transition connecting guard plate 11 away from the tail section guard plate 5 are both composed of a slag line portion 14 and a molten pool portion 15, the tail section guard plate 5 and a part of the second arc-shaped transition connecting guard plate 11 adjacent to the tail section guard plate 5 are both composed of a slag line portion 14, a molten pool portion 15 and a supporting portion 16, the thickness of the slag line portion 14 is greater than the thickness of the molten pool portion 15, the thickness of the supporting portion 16 is greater than the thickness of the molten pool portion 15 and is less than or equal to the maximum thickness of the slag line portion 14; the side elevation of the tail section guard plate 5 of the left guard plate 1 is connected to the side elevation of the tail section guard plate 5 of the right guard plate 2 to form the electromagnetic stirring middle package working layer guard plate.

[0055] like Figures 5a to 6c as well as Figures 11a to 12cAs shown, the included angle A between the outer side surface 7 of the head section guard plate 3 and the lower end surface 13 is 80°, the included angle B between the outer side surface 7 of the tail section guard plate 5 and the lower end surface 13 is 85°, and the included angle C between the outer side surface 7 of the middle section guard plate 4 and the upper end surface 12 is 95°. The thickness of the molten pool portion 15 is equal at all places, and the thickness of the molten pool portion 15 of the head section guard plate 3, the middle section guard plate 4 and the tail section guard plate 5 are all equal.

[0056] From the upper end surface 12 to the molten pool portion 15: the thickness of the slag line portion 14 gradually decreases to be equal to the thickness of the molten pool portion 15 [as shown in FIG. Figure 5a to Figure 5c As well as Figures 11a to 11c or from the upper end surface 12 to the molten pool portion 15: the thickness of the slag line portion 14 is equal at all places [as shown Figures 6a to 6c As well as Figures 12a to 12c The thickness of the molten pool portion 15 is 85 mm at all locations.

[0057] In this embodiment: from the upper end surface 12 to the molten pool portion 15: the thickness of the slag line portion 14 gradually decreases from 130 mm to the same as the thickness of the molten pool portion 15; or from the upper end surface 12 to the molten pool portion 15: the thickness of the slag line portion 14 is 110 mm at all locations; the depth of the slag line portion 14 is 300 mm; the depth of the abutment portion 16 is 85 mm, and the thickness of the abutment portion 16 is 130 mm at all locations.

[0058] like Figure 2 and Figure 8 As shown, the included angle D between the middle section guard plate 4 and the tail section guard plate 5 is 155°, and the arc radius R2 of the second arc-shaped transition connecting guard plate 11 is 299mm; the included angle E between the head section guard plate 3 and the middle section guard plate 4 is 152°, and the arc radius R1 of the first arc-shaped transition connecting guard plate 10 is 524mm. Figure 1 and Figure 7 As shown, a slot 6 is provided on the upper end surface 12 of the tail section guard plate 5, and lifting hooks 9 are provided on both sides of the slot 6. The slot bottom length of the slot 6 is 200 mm, the slot opening length is 220 mm, and the distance between the slot opening of the slot 6 and the side elevation of the tail section guard plate 5 is 970 mm. The height between the lower bottom surface of the middle section guard plate 4 and the lower end surface 13 is 480 mm.

[0059] like Figures 1 to 6cAs shown, in this embodiment, the height of the left guard plate 1 is 990mm and the length of the top is 2405mm. On the outside of the top of the left guard plate 1: the distance between the facade of the head section guard plate 3 and the arc top of the first arc-shaped transition connecting guard plate 10 is 335mm, the distance between the arc top of the first arc-shaped transition connecting guard plate 10 and the arc top of the second arc-shaped transition connecting guard plate 11 is 450mm, and the distance between the facade of the tail section guard plate 5 and the arc top of the second arc-shaped transition connecting guard plate 11 is 1630mm; on the inside of the top of the left guard plate 1: the distance between the facade of the head section guard plate 3 and the arc top of the first arc-shaped transition connecting guard plate 10 is 343mm, and the distance between the facade of the tail section guard plate 5 and the arc top of the second arc-shaped transition connecting guard plate 11 is 450mm. The distance between the arc top of the first arc-shaped transition connecting guard plate 10 and the arc top of the second arc-shaped transition connecting guard plate 11 is 445mm, and the distance between the vertical surface of the tail section guard plate 5 and the arc top of the second arc-shaped transition connecting guard plate 11 is 1645mm; on the outside of the bottom end of the left guard plate 1: the length of the head section guard plate 3 is 260mm, the distance between the head section guard plate 3 and the tail section guard plate 5 is 407mm, and the length of the tail section guard plate 5 is 1629mm; on the inside of the bottom end of the left guard plate 1: the length of the head section guard plate 3 is 260mm, the distance between the head section guard plate 3 and the tail section guard plate 5 is 407mm, and the length of the tail section guard plate 5 is 1658mm.

[0060] like Figures 7 to 12c As shown, the right guard plate 2 has a height of 990 mm and a top length of 2505 mm. On the outside of the top of the right guard plate 2: the distance between the vertical surface of the head section guard plate 3 and the arc top of the first arc-shaped transition connecting guard plate 10 is 335 mm, the distance between the arc top of the first arc-shaped transition connecting guard plate 10 and the arc top of the second arc-shaped transition connecting guard plate 11 is 450 mm, and the distance between the vertical surface of the tail section guard plate 5 and the arc top of the second arc-shaped transition connecting guard plate 11 is 1730 mm.

[0061] On the inner side of the top of the right guard plate 2: the distance between the vertical surface of the head section guard plate 3 and the arc top of the first arc-shaped transition connecting guard plate 10 is 343mm, the distance between the arc top of the first arc-shaped transition connecting guard plate 10 and the arc top of the second arc-shaped transition connecting guard plate 11 is 445mm, and the distance between the vertical surface of the tail section guard plate 5 and the arc top of the second arc-shaped transition connecting guard plate 11 is 1745mm; on the outer side of the bottom end of the right guard plate 2: the length of the head section guard plate 3 is 260mm, the distance between the head section guard plate 3 and the tail section guard plate 5 is 407mm, and the length of the tail section guard plate 5 is 1729mm; on the inner side of the bottom end of the right guard plate 2: the length of the head section guard plate 3 is 260mm, the distance between the head section guard plate 3 and the tail section guard plate 5 is 407mm, and the length of the tail section guard plate 5 is 1758mm.

[0062] The electromagnetic stirring ladle working layer guard plate of this embodiment has the following technical advantages:

[0063] 1. It can effectively ensure the safe smelting of electromagnetic stirring ladle. The two ends of the middle section guard plate are connected by arc transition, which can reduce the stress in the plate, reduce the impact force exerted on the guard plate by the molten steel due to the change of direction, optimize the flow field of the molten steel in the ladle, even the temperature and composition of the molten steel, and improve the product quality.

[0064] 2. A support portion is provided on the inner side of the tail section guard plate. The provision of the support portion enables the guard plate to be more reliably installed inside the middle package.

[0065] 3. Slag lines are set on the inner sides of the top ends of the head guard plate, arc-shaped transition connecting plate, middle guard plate and tail guard plate. The thickened slag lines can resist the erosion of floating slag on the surface of molten steel and improve service life.

[0066] 4. The thickened slag line has two structural forms, a uniformly thickened slag line and a gradually thickened slag line. Although the uniformly thickened slag line can improve the corrosion resistance, the right angle at the bottom will increase the internal stress of the guard plate and cannot effectively buffer the impact of the molten steel. The gradually thickened slag line can reduce the internal stress of the guard plate and reduce the impact of the molten steel, further improving the service life.

[0067] Simulation test of flow field of tundish with electromagnetic stirring of tundish working layer guard plate according to the embodiment

[0068] 1. The specific test parameters are shown in Table 1 below:

[0069] Table 1 Parameters required for the test

[0070] name parameter Billet size 280mm×380mm Pulling speed 0.62m / min~0.85m / min Inner and outer diameter of shroud 75mm / 135mm Working fluid level 700mm~850mm Long shroud insertion depth 200mm~300mm

[0071] 2. Simulation Analysis

[0072] 2.1 CAD digital object modeling

[0073] The flow field is a space domain filled with fluid, so the CAD model is a complex geometric body filled with molten steel. Considering the symmetric characteristics of the flow field space, 1 / 2 of the flow field space is taken as the calculation object, and the symmetry surface is processed using a numerical symmetry boundary. The original three-dimensional space model of the flow field is as follows Fig.13 As shown:

[0074] 2.2 CAE Digital Object Modeling

[0075] The test object is divided into tetrahedral grids, and the number of grids is about 750,000.

[0076] 2.3 CAE Model

[0077] In this experiment, the Stokes equations were used to describe the flow phenomenon of molten steel. The finite volume method was used for calculation. The k-ε double equation mathematical model was used to describe the turbulent flow characteristics of molten steel. The turbulent flow in the near-wall area was treated with an optimized wall function.

[0078] 2.4 Boundary Conditions

[0079] According to the working conditions of the test object in service, the boundary conditions are set. For details, please see the following table:

[0080] Table 2 Boundary conditions

[0081] area Boundary conditions parameter Entrance Speed ​​​​entry Speed ​​is calculated from casting parameters Free surface Free slip wall Tundish wall No-slip wall Symmetrical plane Symmetrical Boundary exit Open Borders Relative pressure is 0

[0082] 3. Results of Flow Field of Liquid Steel in Tundish

[0083] In order to intuitively display the flow field results, streamline diagram and vector diagram are used to describe the calculation results. The details are as follows:

[0084] 3.1. The overall streamline diagram is as follows Fig.14 shown.

[0085] 3.2. The velocity vector diagram of the symmetry surface is shown in Fig.15 shown.

[0086] 3.3、The velocity vector diagram of the cross section where the stopper rod is located is as follows Fig.16 shown.

[0087] 3.4、Liquid surface velocity cloud diagram Fig.17 shown.

[0088] 4. Experimental Results Analysis

[0089] 4.1、RTD curve analysis Fig.18 The RTD curve analysis results are shown in Table 3.

[0090] Table 3 RTD curve analysis results

[0091]

[0092] 4.2. Analysis of inclusion removal rate is shown in Table 4

[0093] Table 4 Calculation results of inclusion removal rate

[0094]

[0095] In this embodiment, the ladle working layer guard plate further optimizes the ladle flow field when used together with the guide pipe in the ladle, improves the inclusion removal rate, and thus improves the quality of steel. The structure can improve the removal of inclusions of different particle sizes to a certain extent, especially for the removal of large particle size inclusions, the improvement effect is more obvious. Overall, the residence time of each flow of molten steel in the ladle using this structure is another beneficial attempt to eliminate the dead zone, and the overall average residence time and dead zone volume are almost the same.

[0096] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A working layer guard plate for electromagnetic stirring ladle, characterized in that: The invention is composed of a left guard plate (1) and a right guard plate (2), wherein the left guard plate (1) and the right guard plate (2) each include a head guard plate (3), a first arc-shaped transition connecting guard plate (10), a middle guard plate (4), a second arc-shaped transition connecting guard plate (11) and a tail guard plate (5), wherein the center of the first arc-shaped transition connecting guard plate (10) is located on the side of the electromagnetic stirring ladle working layer guard plate adjacent to the molten steel, and the center of the second arc-shaped transition connecting guard plate (11) is located on the side of the electromagnetic stirring ladle working layer guard plate away from the molten steel; the head guard plate (3) and the tail guard plate (5) have the same height, the height of the middle guard plate (4) from the top to the bottom, a portion of the first arc-shaped transition connecting guard plate adjacent to the middle guard plate (4) (10) the height from the top to the bottom, and the height from the top to the bottom of a portion of the second arc-shaped transition connecting guard plate (11) adjacent to the middle section guard plate (4) are respectively smaller than the height from the top to the bottom of the head section guard plate (3) and the tail section guard plate (5) so that a mounting notch (8) is formed between the head section guard plate (3) and the tail section guard plate (5), the upper end surfaces (12) of the head section guard plate (3), the first arc-shaped transition connecting guard plate (10), the middle section guard plate (4), the second arc-shaped transition connecting guard plate (11) and the tail section guard plate (5) are flush and parallel to the horizontal ground, and the lower end surfaces (13) of the head section guard plate (3) and the tail section guard plate (5) are flush and parallel to the horizontal ground; One end of the middle section guard plate (4) is connected to the head section guard plate (3) through the first arc-shaped transition connecting guard plate (10), and the other end is connected to the tail section guard plate (5) through the second arc-shaped transition connecting guard plate (11); the sides of the head section guard plate (3), the middle section guard plate (4) and the tail section guard plate (5) away from the molten steel are outer side surfaces (7) and are all planes, and the angle A between the outer side surface (7) of the head section guard plate (3) and the lower end surface (13), the angle B between the outer side surface (7) of the tail section guard plate (5) and the lower end surface (13), and the angle C between the outer side surface (7) of the middle section guard plate (4) and the upper end surface (12) increase in sequence; from the upper end surface (12) to the lower end Surface (13): the head section guard plate (3), the first arc-shaped transition connecting guard plate (10), the middle section guard plate (4) and a portion of the second arc-shaped transition connecting guard plate (11) away from the tail section guard plate (5) are all composed of a slag line portion (14) and a molten pool portion (15); the tail section guard plate (5) and a portion of the second arc-shaped transition connecting guard plate (11) adjacent to the tail section guard plate (5) are all composed of a slag line portion (14), a molten pool portion (15) and an abutting portion (16); the thickness of the slag line portion (14) is greater than the thickness of the molten pool portion (15); the thickness of the abutting portion (16) is greater than the thickness of the molten pool portion (15) and is less than or equal to the maximum thickness of the slag line portion (14);The side elevation of the tail section guard plate (5) of the left guard plate (1) is butted against the side elevation of the tail section guard plate (5) of the right guard plate (2) to form the electromagnetic stirring mid-package working layer guard plate. ; 2. The electromagnetic stirring ladle working layer guard plate according to claim 1, characterized in that: The included angle A between the outer side surface (7) of the head section guard plate (3) and the lower end surface (13) is 80°, the included angle B between the outer side surface (7) of the tail section guard plate (5) and the lower end surface (13) is 85°, and the included angle C between the outer side surface (7) of the middle section guard plate (4) and the upper end surface (12) is 95°.

3. The electromagnetic stirring ladle working layer guard plate according to claim 1, characterized in that: The thickness of the molten pool portion (15) is equal at all locations, and the thickness of the molten pool portion (15) of the head section guard plate (3), the middle section guard plate (4) and the tail section guard plate (5) are all equal.

4. The electromagnetic stirring ladle working layer guard plate according to claim 1, characterized in that: From the upper end surface (12) to the molten pool portion (15), the thickness of the slag line portion (14) gradually decreases to be equal to the thickness of the molten pool portion (15); or from the upper end surface (12) to the molten pool portion (15), the thickness of the slag line portion (14) is equal at all locations.

5. The electromagnetic stirring ladle working layer guard plate according to any one of claims 1 to 4, characterized in that: The thickness of the molten pool portion (15) is 85 mm at all locations.

6. The electromagnetic stirring ladle working layer guard plate according to any one of claims 1 to 4, characterized in that: From the upper end surface (12) to the molten pool portion (15): the thickness of the slag line portion (14) gradually decreases from 130 mm to the same thickness as the molten pool portion (15); or from the upper end surface (12) to the molten pool portion (15): the thickness of the slag line portion (14) is 110 mm at all locations; the depth of the slag line portion (14) is 300 mm; the depth of the abutment portion (16) is 85 mm, and the thickness of the abutment portion (16) is 130 mm at all locations.

7. The electromagnetic stirring ladle working layer guard plate according to any one of claims 1 to 4, characterized in that: The angle D between the middle section guard plate (4) and the tail section guard plate (5) is 155°, and the arc radius R2 of the second arc-shaped transition connecting guard plate (11) is 299 mm; the angle E between the head section guard plate (3) and the middle section guard plate (4) is 152°, and the arc radius R1 of the first arc-shaped transition connecting guard plate (10) is 524 mm; a slot (6) is provided on the upper end surface (12) of the tail section guard plate (5), and lifting hooks (9) are respectively provided on both sides of the slot (6); the bottom length of the slot (6) is 200 mm, and the slot length is 220 mm; the distance between the slot of the slot (6) and the side surface of the tail section guard plate (5) is 970 mm.

8. The electromagnetic stirring ladle working layer guard plate according to any one of claims 1 to 4, characterized in that: The height of the left guard plate (1) is 990 mm, and the length of the top is 2405 mm. On the outside of the top of the left guard plate (1), the distance between the vertical surface of the head section guard plate (3) and the arc top of the first arc-shaped transition connecting guard plate (10) is 335 mm, the distance between the arc top of the first arc-shaped transition connecting guard plate (10) and the arc top of the second arc-shaped transition connecting guard plate (11) is 450 mm, and the distance between the vertical surface of the tail section guard plate (5) and the arc top of the second arc-shaped transition connecting guard plate (11) is 1630 mm. On the inner side of the top end of the left guard plate (1): the distance between the vertical surface of the head section guard plate (3) and the arc top of the first arc-shaped transition connecting guard plate (10) is 343 mm, the distance between the arc top of the first arc-shaped transition connecting guard plate (10) and the arc top of the second arc-shaped transition connecting guard plate (11) is 445 mm, and the distance between the vertical surface of the tail section guard plate (5) and the arc top of the second arc-shaped transition connecting guard plate (11) is 1645 mm; On the outside of the bottom end of the left guard plate (1): the length of the head section guard plate (3) is 260 mm, the distance between the head section guard plate (3) and the tail section guard plate (5) is 407 mm, and the length of the tail section guard plate (5) is 1629 mm; On the inner side of the bottom end of the left guard plate (1): the length of the head section guard plate (3) is 260 mm, the distance between the head section guard plate (3) and the tail section guard plate (5) is 407 mm, and the length of the tail section guard plate (5) is 1658 mm.

9. The electromagnetic stirring ladle working layer guard plate according to any one of claims 1 to 4, characterized in that: The right guard plate (2) has a height of 990 mm and a top length of 2505 mm. On the outside of the top of the right guard plate (2), the distance between the vertical surface of the head section guard plate (3) and the top of the first arc-shaped transition connecting guard plate (10) is 335 mm, the distance between the top of the first arc-shaped transition connecting guard plate (10) and the top of the second arc-shaped transition connecting guard plate (11) is 450 mm, and the distance between the vertical surface of the tail section guard plate (5) and the top of the second arc-shaped transition connecting guard plate (11) is 1730 mm. On the inner side of the top end of the right guard plate (2): the distance between the vertical surface of the head section guard plate (3) and the arc top of the first arc-shaped transition connecting guard plate (10) is 343 mm, the distance between the arc top of the first arc-shaped transition connecting guard plate (10) and the arc top of the second arc-shaped transition connecting guard plate (11) is 445 mm, and the distance between the vertical surface of the tail section guard plate (5) and the arc top of the second arc-shaped transition connecting guard plate (11) is 1745 mm; On the outside of the bottom end of the right guard plate (2): the length of the head section guard plate (3) is 260 mm, the distance between the head section guard plate (3) and the tail section guard plate (5) is 407 mm, and the length of the tail section guard plate (5) is 1729 mm; On the inner side of the bottom end of the right guard plate (2): the length of the head section guard plate (3) is 260 mm, the distance between the head section guard plate (3) and the tail section guard plate (5) is 407 mm, and the length of the tail section guard plate (5) is 1758 mm.

10. The electromagnetic stirring ladle working layer guard plate according to any one of claims 1 to 4, characterized in that: The height between the lower bottom surface of the middle section guard plate (4) and the lower end surface (13) is 480 mm.

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