Capacity-increasing type long-service-life turbulence suppressor for continuous casting

Abstract

The capacity-increasing type long-service-life turbulence suppressor for continuous casting comprises a body (1) and an inner cavity (2), the body (1) is in a regular oval shape or an irregular oval shape with the radiuses of arcs on the two sides unequal, an impact point bottom face (121) is arranged on one side of an impact bottom plate (12), a far-end bottom face (122) is arranged on the other side of the impact bottom plate (12), and the position of the impact point bottom face (121) is higher than that of the far-end bottom face (122). A settlement type inner cavity structure which is staggered up and down in the height direction is formed; a composite impact plate (3) is embedded into the impact point bottom surface (121), and the composite impact plate (3) is of an integrally-formed structure which is formed by being embedded into the body (1) through pouring after being formed through mechanical pressing. The flow stabilizer has the advantages that the service life of the flow stabilizer is prolonged, the pouring time is prolonged, the volume of the inner cavity is increased, the impact kinetic energy and turbulence intensity of an impact area of the tundish are reduced, the plunger flow proportion is increased, inclusions float upwards and are removed, impact on a steel slag interface and the slag entrapment probability are reduced, and the cleanliness of molten steel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refractory materials, in particular to an enlarged-capacity long-life turbulence inhibitor for continuous casting. Background Art

[0002] In recent years, the steel industry has increasingly strict requirements for the cleanliness of molten steel. As an intermediate buffer container for high-temperature molten steel to finally enter the mold from the ladle and solidify into a solid steel billet, the continuous casting tundish plays a key role in connecting the preceding with the following. The process of molten steel pouring from the ladle into the impact zone of the tundish is accompanied by intense stirring and reaction among multiple phases of "molten steel - tundish slag - air - refractory material", which is an important reason for the secondary pollution of molten steel. The use of a turbulence inhibitor can effectively reduce the impact kinetic energy and the reaction tendency among multiple phases. By restricting the flow direction of the injected molten steel, the side wall of the main body blocks the molten steel, and the return flow collides and mixes with the subsequent injected molten steel. This process continues continuously, thereby reducing the turbulence intensity and stirring energy, calming the molten pool and increasing the proportion of plug flow at the same time.

[0003] On the one hand, the performance of the turbulence inhibitor depends on the product design, which is related to the external shape structure and volume of the inner cavity, and determines the turbulence kinetic energy inhibition effect; on the other hand, it depends on the product life, which is related to the erosion resistance of materials at positions such as the impact point, and determines the service life and safety. However, due to the limitation of the tundish structure, it is common that the turbulence inhibitor cannot be arranged or the volume of the inner cavity is too small, and the impact bottom plate cannot meet the service life requirements. As a result, the flow control effect and metallurgical effect of the molten pool in the impact zone of the tundish cannot be fully exerted, and the requirements for the pouring time of molten steel cannot be fully guaranteed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problems of insufficient volume, poor use effect and low service life of the existing turbulence inhibitor, and provide an enlarged-capacity long-life turbulence inhibitor for continuous casting, which can not only improve the erosion resistance of materials, extend the service life, increase the effective volume of the inner cavity, but also be conducive to the floating and removal of inclusions, and improve the cleanliness and treatment effect of molten steel.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] An enlarged-capacity long-life turbulence inhibitor for continuous casting, comprising a main body and an inner cavity. The main body includes a flow-blocking wall and an impact bottom plate. The inner cavity is formed by being surrounded by the main body. The outer shape of the main body is a regular ellipse or an irregular ellipse with unequal arc radii on both sides. One side of the impact bottom plate is set as the bottom surface of the impact point, and the other side is set as the bottom surface of the far end. The position of the bottom surface of the impact point is higher than that of the bottom surface of the far end, forming a sunken inner cavity structure with a height difference in the height direction;

[0007] The bottom surface of the impact point is provided with a downwardly recessed groove, and a composite impact plate is embedded in the groove. The composite impact plate is a structure that is integrally formed by casting after being press-molded and embedded in the body.

[0008] Further, the arc radius of the bottom surface of the impact point of the impact bottom plate is R 1 and the arc radius of the bottom surface of the distal end is R 2 , and the two are connected by an arc segment at both ends through a straight line segment, R 2 is 1 to 5 times larger than R 1 .

[0009] Further, the height difference between the bottom surface of the impact point and the bottom surface of the distal end is 100 to 300 mm.

[0010] Further, the composite impact plate is a square structure with a thickness of 50 to 100 mm, and the side length of the composite impact plate is smaller than the arc diameter of the bottom surface of the impact point.

[0011] Further, the upper surface of the composite impact plate is flush with the upper surface of the bottom surface of the impact point.

[0012] Further, the flow blocking wall and the impact bottom plate of the body are made of high-alumina or high-magnesia casting materials, and the composite impact plate is made of aluminum-carbon or magnesia-carbon press-molded materials.

[0013] Compared with the prior art, the advantages of the technical solution of the present utility model are specifically as follows:

[0014] (1) The bottom of the turbulence suppressor body of the present utility model is compounded with a high-density impact plate structure and the bottom is convex and thickened at the impact point position, which improves the erosion resistance of the material and extends the service life;

[0015] (2) The turbulence suppressor of the present utility model adopts an asymmetric inner cavity design. The bottom surface radius and outer diameter of the impact point are small, which is suitable for the environment where the impact point of the tundish is close to the ladle wall and there is not enough space in the impact area to accommodate a large suppressor. The bottom surface radius of the distal end is large, and the two arc segments at both ends are connected by a straight line segment, which expands the bottom surface area of the suppressor and increases the effective volume of the inner cavity;

[0016] (3) The bottom of the turbulence suppressor of the present utility model adopts a local settlement design, and the bottom planes differ by a certain height. By increasing the height of the distal bottom surface part of the impact point, the volume of the inner cavity is further increased;

[0017] (4) The composite impact plate and the asymmetric special-shaped inner wall body of the turbulence suppressor of the present utility model are integrally formed by casting. The bottom is compounded with an impact plate and the inner cavity structure is relatively complex, and the installation is simple and easy, and the use is safe and reliable. Description of the Drawings

[0018] Figure 1Internal structure diagram of the capacity-increasing long-life turbulence suppressor for continuous casting of the present utility model;

[0019] Figure 2 Top view of the capacity-increasing long-life turbulence suppressor for continuous casting of the present utility model. Specific embodiments Embodiment

[0020] To make the present utility model more clearly understood, the following further describes a capacity-increasing long-life turbulence suppressor for continuous casting of the present utility model in conjunction with the accompanying drawings. The specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] See Figure 1 and Figure 2 , a capacity-increasing long-life turbulence suppressor for continuous casting, including a body 1 and an inner cavity 2. The body 1 includes a flow-blocking wall 11 and an impact bottom plate 12. The inner cavity 2 is formed by being surrounded by the body 1. It is characterized in that:

[0022] The outer shape of the body 1 is an irregular ellipse with unequal arc radii on both sides. One side of the impact bottom plate 12 is set as the impact point bottom surface 121, and the other side is set as the distal bottom surface 122. The arc radius of the impact point bottom surface 121 is R 1 , and the arc radius of the distal bottom surface 122 is R 2 . The two are connected by a straight line segment to the arc segments at both ends. R 2 is 1 to 5 times larger than R 1 ;

[0023] The position of the impact point bottom surface 121 is higher than that of the distal bottom surface 122, and the height difference between the two is 100 to 300 mm, forming a sunken inner cavity structure with a height difference in the height direction;

[0024] A downwardly concave groove 12a is provided on the impact point bottom surface 121. A composite impact plate 3 is embedded in the groove 12a. The composite impact plate 3 is a structure integrally formed by being embedded in the body 1 after being machine-pressed. The composite impact plate 3 is a square structure, and its thickness is 50 to 100 mm. The side length of the composite impact plate 3 is smaller than the arc diameter of the impact point bottom surface 121;

[0025] After being embedded, the upper surface of the composite impact plate 3 is flush with the upper surface of the impact point bottom surface 121.

[0026] In this embodiment, the flow-blocking wall 11 and the impact bottom plate 12 of the body 1 are made of high-alumina or high-magnesia casting materials, and the composite impact plate 3 is made of aluminum-carbon or magnesia-carbon machine-pressed materials.

[0027] In this embodiment, the body 1 includes a flow-blocking wall 11 and an impact bottom plate 12, which are the physical structures of the turbulence suppressor and are used to limit the flow direction of the molten steel and counteract the impact of the incident jet; the inner cavity 2 is composed of the internal space surrounded by the body 1 and is used to hold the molten steel and ensure that there is sufficient space and volume inside, so as to make the effect of reducing and counteracting the turbulence intensity more sufficient.

[0028] The appearance shape of the product of the present utility model is a cylindrical structure with arc-shaped sides on both sides. At the distal position of the impact point, by optimizing the design of the inner cavity and adopting an asymmetric dislocation design, the impact point position protrudes and is compounded with a high-density impact plate, which is used to improve the erosion resistance of the impact bottom plate and extend its service life. The volume of the inner cavity is expanded by increasing the bottom radius and height at the distal end away from the impact point. The molten steel is injected and diffuses around along the bottom reflection. The distance and time to reach the distal end increase with the expansion in the height direction and diameter direction, which is beneficial to more sufficient mixing and flushing between the jets, can modify a larger volume of the incident jet, improve the flow control effect, is beneficial to reducing the impact kinetic energy and turbulence intensity in the impact zone of the tundish, is beneficial to increasing the proportion of plug flow and floating and removing inclusions, improving the cleanliness of the molten steel, while reducing the impact on the steel slag interface and the probability of slag entrainment, and reducing the probability of secondary pollution of the molten steel.

[0029] In addition to the above embodiments, the present utility model can also have other implementation manners. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present utility model.

Claims

1. A volume-increasing long-life turbulence suppressor for continuous casting, comprising a body (1) and an inner cavity (2), wherein the body (1) comprises a flow-blocking wall (11) and an impact bottom plate (12), and the inner cavity (2) is surrounded by the body (1), characterized in that: The outer shape of the body (1) is a regular ellipse or an irregular ellipse with unequal arc radii on both sides; one side of the impact bottom plate (12) is set as an impact point bottom surface (121) and the other side is set as a distal end bottom surface (122); the impact point bottom surface (121) is located higher than the distal end bottom surface (122), forming a subsidence-type inner cavity structure with a high-low misalignment in the height direction; A downwardly recessed groove (12a) is provided on the bottom surface (121) of the impact point, and a composite impact plate (3) is embedded in the groove (12a). The composite impact plate (3) is a one-piece cast structure that is formed by machine compression molding and then embedded in the body (1).

2. The volume-increasing long-life turbulence suppressor for continuous casting according to claim 1, characterized in that: The impact point bottom surface (121) of the impact bottom plate (12) has an arc radius of R1, and the bottom surface (122) at the far end has an arc radius of R2. The arc segments at both ends are connected by a straight line segment, and R2 is 1 to 5 times larger than R1.

3. The volume-increasing long-life turbulence suppressor for continuous casting according to claim 1 or 2, characterized in that: The height difference between the impact point bottom surface (121) and the distal end bottom surface (122) is 100-300 mm.

4. The volume-increasing long-life turbulence suppressor for continuous casting according to claim 1 or 2, characterized in that: The composite impact plate (3) is a square structure with a thickness of 50-100 mm. The side length of the composite impact plate (3) is smaller than the arc diameter of the bottom surface (121) of the impact point.

5. The volume-increasing long-life turbulence suppressor for continuous casting according to claim 1 or 2, characterized in that: The upper surface of the composite impact plate (3) is flush with the upper surface of the impact point bottom surface (121).

6. The volume-increasing long-life turbulence suppressor for continuous casting according to claim 1 or 2, characterized in that: The flow-blocking wall (11) and the impact bottom plate (12) of the body (1) are made of high-alumina or high-magnesia casting materials, and the composite impact plate (3) is made of aluminum-carbon or magnesium-carbon machine-pressed material.

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