Tundish device

Abstract

The utility model discloses a tundish device, the width of a flow stabilizing cavity of a flow stabilizer is gradually increased and then gradually decreased in the direction from the top of a tundish body to the bottom of the tundish body, the flow stabilizing cavity comprises a circular truncated cone-shaped section, a cylindrical section and a hemispherical section which are connected in sequence, and the small-diameter end of the circular truncated cone-shaped section can be pushed out to be located above the large-diameter end; the end, with the larger diameter, of the hemispherical section is connected with the cylindrical section. The molten steel is sequentially decompressed by the hemispherical section, the cylindrical section and the truncated cone-shaped section, so that the impact strength of the molten steel flowing out of the tundish is reduced. Molten steel enters the filtering hole communicated with the opening part, the filtering hole is provided with a first opening communicated with the opening part and a second opening communicated with the outer surface of the flow stabilizer, the maximum height of the second opening is larger than that of the first opening, most impurities are left in the first opening close to the flow stabilizing cavity, and the purity of the molten steel flowing out of the second opening is improved. The impact strength of the molten steel flowing out of the tundish is weakened, and the purity of the molten steel is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of continuous casting equipment for steelmaking, and particularly relates to a tundish device. BACKGROUND

[0002] A tundish is a container for holding molten steel after a steel ladle and continuously casting molten steel. The molten steel enters the tundish, and then enters a crystallizer after being divided and stabilized in the tundish. The tundish includes a body and a submerged nozzle. The body is provided with an inner cavity with an opening, and the molten steel can enter the inner cavity. The submerged nozzle is inserted into the bottom of the body to communicate with the inner cavity, so as to guide the molten steel from the inner cavity to the crystallizer. The inner cavity of the body of some tundishes is provided with a stabilizer. The molten steel first enters the stabilizing cavity of the stabilizer, and then overflows from the stabilizing cavity of the stabilizer into the inner cavity of the body, and finally flows out to the crystallizer through the submerged nozzle. The molten steel passing through the stabilizer can have a certain filtering and pressure relief effect, so that the impact of the molten steel entering the crystallizer is smaller, and the quality of the molten steel is better.

[0003] In the prior art, the longitudinal section of the inner cavity of the stabilizer is often trapezoidal or irregularly shaped, and the stabilizing effect on the molten steel is not good, and the filtering effect of the molten steel flowing from the stabilizer into the tundish is poor. The impact strength and purity of the molten steel flowing into the crystallizer are not ideal. SUMMARY

[0004] The application aims to at least solve the problem of the impact strength and purity of the molten steel flowing from the tundish into the crystallizer. To this end, the application provides a tundish device.

[0005] The tundish device provided by the application comprises:

[0006] The tundish comprises a body and a submerged nozzle, and the submerged nozzle is inserted into the body and communicates with the inner cavity;

[0007] The stabilizer is connected with the body and located at the bottom of the inner cavity, and the stabilizer is spaced from the submerged nozzle. The stabilizer is provided with a stabilizing cavity, a mouth portion and a filter hole. In the direction from the top of the body to the bottom of the body, the width of the stabilizing cavity gradually increases and then gradually decreases, and the stabilizing cavity comprises a frustum segment, a cylindrical segment and a hemispherical segment connected in sequence. The mouth portion communicates with the frustum segment to receive the molten steel into the stabilizing cavity. The filter hole is provided with a first opening communicating with the mouth portion and a second opening communicating with the outer surface of the stabilizer. The maximum height of the second opening is greater than that of the first opening.

[0008] Optionally, the semi-spherical segment is a semi-elliptical spherical segment, a long axis of the semi-spherical segment is a maximum width of the semi-spherical segment, a short axis of the semi-spherical segment is a maximum height of the semi-spherical segment, and a long radius of the semi-spherical segment is greater than or equal to an axial length of the cylindrical segment.

[0009] Optionally, a ratio of the long axis to the short axis is k, and 1≦k≦2.

[0010] Optionally, a ratio of a length of the package body to the long radius is i, and 4≦i≦10.

[0011] Optionally, an included angle between a generatrix of the circular truncated cone segment and an axis of the circular truncated cone segment is 30-60°.

[0012] Optionally, the flow stabilizer and the submerged nozzle are respectively located at two ends of the package body in the length direction, and the second opening faces the submerged nozzle.

[0013] Optionally, the flow stabilizer is provided with at least two filter holes, and the at least two filter holes are arranged around the mouth portion.

[0014] Optionally, the tundish further comprises:

[0015] a cover connected to a top of the package body and used for covering the inner cavity;

[0016] a long nozzle plugged with the cover and having one end extended into the inner cavity and opposite to the mouth portion of the flow stabilizer, so as to introduce molten steel into the inner cavity and flow into the mouth portion, a distance between the mouth portion and the long nozzle is L, and a sum of a height of the cylindrical segment and a height of the semi-spherical segment is S, and S≦L≦2S.

[0017] Optionally, the package body comprises:

[0018] at least two bodies arranged and connected in sequence in the length direction of the package body, each of the bodies is provided with a corresponding accommodation cavity, and adjacent two accommodation cavities are communicated, the at least two accommodation cavities are configured as the inner cavity, and the flow stabilizer and the submerged nozzle are respectively arranged in the adjacent two accommodation cavities.

[0019] Optionally, bottoms of the adjacent two accommodation cavities are communicated, the flow stabilizer and the submerged nozzle are respectively arranged in the adjacent two accommodation cavities, and a maximum height of the submerged nozzle is greater than a maximum bottom height of the package body.

[0020] The embodiments of the application have at least the following beneficial effects:

[0021] The inner cavity of the ladle body can be used to accommodate the steady flow of molten steel, and the submerged nozzle inserted into the ladle body and communicating with the inner cavity can guide the molten steel accommodated in the inner cavity to the crystallizer, realizing the normal operation of the ladle. The flow stabilizer is connected with the ladle body and located at the bottom of the inner cavity, and the flow stabilizer is spaced from the submerged nozzle. The molten steel can first enter the flow stabilizing cavity of the flow stabilizer from the mouth of the flow stabilizer before flowing into the ladle. The molten steel overflowing from the flow stabilizing cavity enters the ladle again to play a basic stabilizing and buffering role. The flow stabilizing cavity of the flow stabilizer is arranged in a direction from the top of the ladle body to the bottom of the ladle body, the width of the flow stabilizing cavity gradually increases and then gradually decreases, and the flow stabilizing cavity comprises a circular truncated cone segment, a cylindrical segment and a hemispherical segment connected in sequence. The smaller-diameter end of the circular truncated cone segment can be located above the larger-diameter end, and the larger-diameter end of the hemispherical segment is connected with the cylindrical segment. When the molten steel continuously flows into the flow stabilizing cavity through the mouth, the molten steel first falls into contact with the hemispherical segment, and the smooth curved surface of the hemispherical segment performs preliminary buffering and pressure relief on the molten steel. The molten steel in the flow stabilizing cavity continuously increases to the water level rising to the cylindrical segment, and the molten steel is buffered and relieved in the cylindrical segment. The molten steel rises to contact the circular truncated cone segment, the diameter of the circular truncated cone segment is tapered upward, so that the molten steel is further buffered and relieved, and the diameter of the circular truncated cone segment gradually decreases upward, so that the molten steel is relieved more stably and is not easy to recoil downward, effectively reducing the pressure of the molten steel, so as to reduce the impact caused by the molten steel flowing out of the flow stabilizer and the ladle. The water level of the molten steel rises to the mouth, and the molten steel can enter the filter hole communicating with the mouth. The filter hole is located at a high position. The impurities in the molten steel are partially settled in the flow stabilizing cavity, and the molten steel flowing out of the filter hole can be further filtered by the filter hole. The filter hole is provided with a first opening communicating with the mouth and a second opening communicating with the outer surface of the flow stabilizer. The maximum height of the second opening is greater than that of the first opening. In the case of height difference, most of the impurities will be left in the first opening close to the flow stabilizing cavity, and the purity of the molten steel flowing out of the second opening can be greatly improved, greatly reducing the number of large-size inclusions and the probability of slag entrapment. The impact strength of the molten steel flowing out of the ladle is reduced, and the purity of the molten steel is improved, to a certain extent, solving the problem that the impact strength and the purity of the molten steel flowing from the ladle into the crystallizer are not ideal. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A structural schematic diagram of a ladle device provided by the present application.

[0023] Figure 2 A structural schematic diagram of a flow stabilizer provided by the present application.

[0024] Figure 3 A side view of the flow stabilizer and the body provided by the present application.

[0025] Figure 4 A top view of the flow stabilizer and the body provided by the present application.

[0026] Explanation of reference signs: 1, tundish; 11, tundish body; 111, inner cavity; 112, body; 1121, accommodating cavity; 12, submerged nozzle; 13, long nozzle; 2, flow stabilizer; 21, flow stabilizing cavity; 211, circular truncated cone segment; 212, cylindrical segment; 213, semispherical segment; 22, mouth portion; 23, filter hole; 231, first opening; 232, second opening. DETAILED DESCRIPTION

[0027] In order to make the skilled in the art to which the present application belongs more clearly understand the present application, the technical solutions of the present application are described in detail below with specific embodiments combined with the accompanying drawings.

[0028] Figure 1 A structural schematic diagram of a tundish device provided by the present application is shown in the figure, Figure 2 A structural schematic diagram of a flow stabilizer provided by the present application is shown in the figure, Figure 1 and Figure 2 The tundish device provided by the embodiment of the present application comprises a tundish 1 and a flow stabilizer 2.

[0029] The tundish 1 comprises a tundish body 11 and a submerged nozzle 12, and the submerged nozzle 12 is inserted into the tundish body 11 and communicates with the inner cavity 111.

[0030] The flow stabilizer 2 is connected with the tundish body 11 and located at the bottom of the inner cavity 111, the flow stabilizer 2 is spaced apart from the submerged nozzle 12, the flow stabilizer 2 is provided with a flow stabilizing cavity 21, a mouth portion 22 and a filter hole 23, the flow stabilizing cavity 21 gradually increases in width and then gradually decreases in the direction from the top of the tundish body 11 to the bottom of the tundish body 11 (indicated as A direction), and the flow stabilizing cavity 21 comprises a circular truncated cone segment 211, a cylindrical segment 212 and a semispherical segment 213 connected in sequence, the mouth portion 22 communicates with the circular truncated cone segment 211 for receiving molten steel into the flow stabilizing cavity 21, the filter hole 23 is provided with a first opening 231 and a second opening 232, the first opening 231 communicates with the mouth portion 22 and the second opening 232 communicates with the outer surface of the flow stabilizer 2, and the maximum height of the second opening 232 is greater than that of the first opening 231. Figure 1 and Figure 2 The tundish device provided by the embodiment of the present application comprises a tundish 1 and a flow stabilizer 2.

[0031] The inner cavity 111 of the ladle body 11 of the tundish 1 can be used to accommodate the steady flow of molten steel, and the submerged nozzle 12 inserted into the ladle body 11 and communicating with the inner cavity 111 can guide the molten steel accommodated in the inner cavity 111 to the crystallizer, realizing the normal work of the tundish 1. The flow regulator 2 is connected with the ladle body 11 and located at the bottom of the inner cavity 111, and the flow regulator 2 is spaced from the submerged nozzle 12. The molten steel can first enter the steady flow cavity 21 of the flow regulator 2 from the mouth 22 of the flow regulator 2 before flowing into the tundish 1. The molten steel overflowing from the steady flow cavity 21 enters the tundish 1 again to play a basic steady flow buffering role. The steady flow cavity 21 of the flow regulator 2 is arranged in a direction from the top of the ladle body 11 to the bottom of the ladle body 11, the width of the steady flow cavity 21 gradually increases and then gradually decreases, and the steady flow cavity 21 includes a circular truncated cone segment 211, a cylindrical segment 212 and a hemispherical segment 213 connected in sequence. The smaller diameter end of the circular truncated cone segment 211 is located above the larger diameter end, and the larger diameter end of the hemispherical segment 213 is connected with the cylindrical segment 212. When the molten steel continuously flows into the steady flow cavity through the mouth 22, the molten steel first falls into contact with the hemispherical segment 213, and the smooth curved surface of the hemispherical segment 213 preliminarily buffers and depressurizes the molten steel. The molten steel in the steady flow cavity 21 continuously increases to the water level rising to the cylindrical segment 212, which buffers and depressurizes the molten steel. The molten steel rises to contact the circular truncated cone segment 211, the diameter of the circular truncated cone segment 211 is tapered upward, which further buffers and depressurizes the molten steel, and the diameter of the circular truncated cone segment 211 gradually decreases upward, which can also make the molten steel depressurize more stably and not easily recoil downward, effectively reducing the pressure of the molten steel, thereby reducing the impact of the molten steel flowing out of the flow regulator 2 and the tundish 1. When the water level of the molten steel rises to the mouth 22, the molten steel can enter the filter hole 23 communicating with the mouth 22, and the filter hole 23 is located at a high position. The impurities in the molten steel are partially settled in the steady flow cavity 21, and the molten steel flowing out of the filter hole 23 can be further filtered by the filter hole 23. The filter hole 23 is provided with a first opening 231 communicating with the mouth 22 and a second opening 232 communicating with the outer surface of the flow regulator 2, and the maximum height of the second opening 232 is greater than that of the first opening 231. In the case of height difference, most of the impurities will be left near the first opening 231 close to the steady flow cavity 21, and the purity of the molten steel flowing out of the second opening 232 can be greatly improved, greatly reducing the number of large-sized inclusions and the probability of slag entrapment. The impact strength of the molten steel flowing out of the tundish 1 is reduced, and the purity of the molten steel is improved, to a certain extent, solving the problem that the impact strength and the purity of the molten steel flowing from the tundish 1 into the crystallizer are not ideal.

[0032] It should be noted that the hemispherical segment 213 in the present application is a part of the curved surface obtained by cutting a spherical surface. The cylindrical segment 212 and the frustoconical segment 211 are respectively the side surface of a cylinder and the side surface of a frustocone. The submerged nozzle 12 is a refractory sleeve installed at the bottom of the tundish and inserted below the liquid surface of the mold in the continuous casting equipment for casting. The main function of the submerged nozzle 12 is to prevent the secondary oxidation of the tundish flow and the splashing of molten steel. The long nozzle 13 (or protective tube) is used between the ladle and the tundish 1 to protect the molten steel from secondary oxidation and prevent the splashing of the steel flow. It is preheated before use, otherwise cracking and fracture accidents may occur during the start of casting. It has strong adaptability to steel grades and good corrosion resistance. There is a long nozzle 13 that can be used without heating, which is called an emergency standby nozzle.

[0033] In some embodiments provided in the present application, the hemispherical segment 213 is a semi-elliptical spherical segment, the major axis of the hemispherical segment 213 is the maximum width of the hemispherical segment 213, the minor axis of the hemispherical segment 213 is the maximum height of the hemispherical segment 213, and the major radius of the hemispherical segment 213 is greater than or equal to the axial length of the cylindrical segment 212.

[0034] When the bottom surface of the steady flow cavity 21 is a semi-elliptical spherical segment, the major axis and the minor axis are respectively the maximum width and the maximum height corresponding to the hemispherical segment 213, and the molten steel in the hemispherical segment 213 preferentially flows in the circumferential direction to effectively relieve the pressure. The major radius of the hemispherical segment 213 is greater than or equal to the axial length of the cylindrical segment 212, and the molten steel enters the steady flow cavity 21 from the port 22, so that the molten steel has a sufficient pressure relief space in the circumferential direction.

[0035] For ease of understanding, the major radius of the hemispherical segment 213 is denoted as a, and the minor axis is denoted as b in Figure 2 , the axial length of the cylindrical segment 212 is denoted as S1. Figure 2

[0036] In some embodiments provided in the present application, the port 22 of the flow stabilizer 2 can be in the shape of a pipe mouth, the port 22, the frustoconical segment 211, and the cylindrical segment 212 of the flow stabilizer 2 are coaxially arranged, and the port 22, the frustoconical segment 211, the cylindrical segment 212, and the hemispherical segment 213 are smoothly transitioned. The molten steel can enter the steady flow cavity 21 along the axial direction of the port 22 to be stably relieved and flowed.

[0037] In some embodiments provided in the present application, when the flow stabilizer 2 adopts the structure described in the previous paragraph, the height of the flow stabilizer 2 can be 1 / 4-1 / 3 of the height of the inner cavity 111, the flow stabilizer 2 can be in the shape of a column, and the cylindrical segment 212 of the steady flow cavity 21 is coaxially arranged with the flow stabilizer 2. It is convenient for the molten steel to relieve and flow.

[0038] ​In some embodiments provided by the present application, the flow stabilizer 2 can be a MgO-C flow stabilizer 2. The erosion resistance of the flow stabilizer 2 can be improved.

[0039] In some embodiments provided by the present application, the ratio of the long axis to the short axis is k, and 1≦k≦2. The pressure relief effect on the molten steel can be effectively improved.

[0040] In some embodiments provided by the present application, the ratio of the length of the envelope 11 to the long radius is i, and 4≦i≦10. The ratio of the length of the envelope 11 to the semi-spherical section 213 is better, and the dead zone in the inner cavity 111 of the envelope 11 after the molten steel overflowing from the flow stabilizing cavity 21 or the filtering hole 23 is less.

[0041] In some embodiments provided by the present application, the parallel plane where the long radius is located can be parallel to the length direction of the envelope 11, and the ratio of the length of the envelope 11 to the long radius is i, and 4≦i≦10. The pressure relief and the dead zone reduction effect are better.

[0042] In some embodiments provided by the present application, the included angle between the generatrix of the circular truncated cone section 211 and the axis of the circular truncated cone section 211 is 30-60°. The included angle between the generatrix of the circular truncated cone section 211 and the axis of the circular truncated cone section 211 in this range can effectively improve the pressure relief effect of the circular truncated cone section 211 on the molten steel. The included angle between the generatrix of the circular truncated cone section 211 and the axis of the circular truncated cone section 211 and the central angle α are complementary angles. Figure 2 The central angle α is a complementary angle.

[0043] In some embodiments provided by the present application, the flow stabilizer 2 can be provided with at least two filtering holes 23, and the at least two filtering holes 23 are arranged around the mouth portion 22. The filtering effect on the molten steel can be improved.

[0044] In some embodiments provided by the present application, the filtering hole 23 can be a straight hole and is arranged obliquely, and the filtering hole 23 can be arranged around the mouth portion 22 or the tubular mouth portion 22. The number of the filtering holes 23 can be 2-10, the diameter of each filtering hole 23 can be 50-100 mm, and the included angle between the axis of the filtering hole 23 and the axial direction of the tubular mouth portion 22 can be 60-90°. The filtering hole 23 is arranged in this way, which is convenient for processing and preparation, and can effectively improve the filtering effect of the filtering hole 23.

[0045] In some embodiments provided by the present application, the filtering hole 23 can also be a curved hole with a certain curvature, and the number and the inclination angle can also be arranged outside the range limited in the above paragraph. The present application does not limit this.

[0046] In some embodiments provided in this application, the flow stabilizer 2 and the submerged nozzle 12 are located at opposite ends of the ladle body 11 along its length, with the second opening 232 facing the submerged nozzle 12. Because the flow stabilizer 2 and the submerged nozzle 12 are located at opposite ends of the ladle body 11 along its length, and the second opening 232 faces the submerged nozzle 12, the molten steel flowing out of the second opening 232 can naturally flow towards the submerged nozzle 12. The molten steel flowing out of the second opening 232 can also cover a larger area within the ladle body 11, reducing dead zones that may occur within the tundish 1. This fully utilizes the inner cavity 111 of the ladle body 11 to effectively stabilize the flow and relieve pressure.

[0047] In some embodiments provided in this application, the intermediate package 1 further includes a package cover (not shown in the figure) and a long nozzle 13.

[0048] The ladle cover is connected to the top of the ladle body 11 and covers the inner cavity 111. The long nozzle 13 is inserted into the ladle cover, with one end extending into the inner cavity 111 and opposite the inlet 22 of the flow stabilizer 2, to introduce molten steel into the inner cavity 111 and allow it to flow into the inlet 22. The distance between the inlet 22 and the long nozzle 13 is L, and the sum of the height of the cylindrical section 212 and the height of the hemispherical section 213 is S, where S≦L≦2S. The distance between the long nozzle 13 and the inlet 22 is within the range limited in this section, resulting in better pressure relief for the molten steel. Here, 2S is twice S.

[0049] In some embodiments provided in this application, the package 11 includes at least two bodies 112. Figure 3 A side view of the current stabilizer and the main body provided in this application. Figure 4 A top view of the current stabilizer and its body provided in this application. (Reference) Figure 1 , Figure 3 and Figure 4 At least two bodies 112 are arranged sequentially and connected along the length of the ladle 11. Each body 112 has a corresponding receiving cavity 1121, and two adjacent receiving cavities 1121 are connected. At least two receiving cavities 1121 are configured as inner cavities 111. The flow stabilizer 2 and the submerged entry nozzle 12 are respectively located in two adjacent receiving cavities 1121. Molten steel flows from one receiving cavity 1121 to another receiving cavity 1121 of the ladle 11, which can also play a certain role in controlling the flow of molten steel, making the impact of molten steel smaller and allowing it to enter the crystallizer more stably.

[0050] In some embodiments provided in this application, the bottoms of two adjacent receiving cavities 1121 are connected. The flow stabilizer 2 and the submerged entry nozzle 12 are respectively disposed in the two adjacent receiving cavities 1121, and the maximum height of the submerged entry nozzle 12 is greater than the maximum bottom height of the ladle 11. This can reduce the dead zone within the receiving cavity 1121. After molten steel flows from one receiving cavity 1121 of a body 112 to another receiving cavity 1121 of a body 112, the water level of the molten steel gradually rises until it enters the submerged entry nozzle 12 and flows towards the crystallizer.

[0051] In some embodiments provided by the present application, the two bodies 112 can be connected by a pipe or a protruding pipe and a round hole matched with the protruding pipe, so as to realize the communication flow of the molten steel between the two bodies 112. The present application does not make any limitation in this regard.

[0052] It should be noted that the parallel or vertical in the present application allows a deviation of 0-10° from the concept of absolute parallel or absolute vertical in the relative geometry. The present application does not make any limitation in this regard.

[0053] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all the preferred embodiments and all the changes and modifications falling within the scope of the present application.

[0054] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A tundish device, characterized by, The utility model relates to an intermediate ladle, comprising a ladle body and a submerged nozzle inserted into the ladle body and communicating with an inner cavity of the ladle body; a flow stabilizer connected to the ladle body and located at the bottom of the inner cavity, the flow stabilizer being spaced apart from the submerged nozzle, the flow stabilizer being provided with a flow stabilizing cavity, a mouth portion and a filtering hole, the width of the flow stabilizing cavity gradually increasing and then gradually decreasing in the direction from the top of the ladle body to the bottom of the ladle body, the flow stabilizing cavity comprising a frustoconical segment, a cylindrical segment and a semispherical segment connected in sequence, the mouth portion communicating with the frustoconical segment for receiving molten steel into the flow stabilizing cavity, the filtering hole being provided with a first opening communicating with the mouth portion and a second opening communicating with the outer surface of the flow stabilizer, the maximum height of the second opening being greater than the maximum height of the first opening. The semispherical segment is a semi-elliptical spherical segment, the major axis of the semispherical segment being the maximum width of the semispherical segment, the minor axis of the semispherical segment being the maximum height of the semispherical segment, the major radius of the semispherical segment being greater than or equal to the axial length of the cylindrical segment. The ratio of the major axis to the minor axis is k, 1≤k≤2.

2. The tundish device according to claim 1, characterized in that The ratio of the length of the ladle body to the major radius is i, 4≤i≤10.

3. The tundish device according to claim 2, characterized in that The angle between the generatrix of the frustoconical segment and the axis of the frustoconical segment is 30-60°.

4. The tundish device according to claim 2, characterized in that The flow stabilizer and the submerged nozzle are located at two ends of the ladle body in the length direction, and the second opening faces the submerged nozzle.

5. The tundish device according to any one of claims 1 to 3, characterized in that The flow stabilizer is provided with at least two filtering holes arranged around the mouth portion.

6. The tundish device according to any one of claims 1 to 3, characterized in that The utility model further comprises a ladle cover connected to the top of the ladle body and covering the inner cavity; and a long nozzle inserted into the ladle cover and having one end extending into the inner cavity opposite the mouth portion of the flow stabilizer to introduce molten steel into the inner cavity and flow into the mouth portion, the distance between the mouth portion and the long nozzle being L, the sum of the height of the cylindrical segment and the height of the semispherical segment being S, S≤L≤2S.

7. The tundish device according to any one of claims 1 to 3, characterized in that The utility model further comprises at least two bodies arranged in sequence and connected in the length direction of the ladle body, each of the bodies being provided with a corresponding accommodating cavity, and adjacent two accommodating cavities being communicated, the at least two accommodating cavities being configured as the inner cavity, the flow stabilizer and the submerged nozzle being respectively arranged in adjacent two accommodating cavities.

8. The tundish device according to any one of claims 1 to 3, characterized in that The bottoms of adjacent two accommodating cavities are communicated, the flow stabilizer and the submerged nozzle are respectively arranged in adjacent two accommodating cavities, and the maximum height of the submerged nozzle is greater than the maximum bottom height of the ladle body. ​ ​ 9. The tundish device according to any one of claims 1 to 3, characterized in that ​ ​ 10. The tundish device according to claim 9, characterized in that ​

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