A stopper rod and a continuous casting device

Abstract

This utility model belongs to the field of continuous casting technology, and specifically relates to a stopper rod and continuous casting equipment. The stopper rod includes a rod body and a flow-blocking part. The flow-blocking part protrudes from the outer peripheral wall of the rod body and extends along the length of the stopper rod, located in the slag line region on the rod body, thereby altering and extending the flow path of the tundish slag. The flow-blocking part protruding from the outer peripheral wall of the rod body relatively increases the overall thickness of the stopper rod, thereby improving its erosion resistance and extending its lifespan. During the flow process, the tundish slag needs to bypass the flow-blocking part to contact the rod body, further extending its flow path. This extended flow path leads to an increase in the total kinetic energy consumption of the tundish slag, thereby reducing its flow velocity and reducing the scouring and erosion of the slag line region by the tundish slag, thus maintaining the performance of the stopper rod and extending its lifespan.

Description

Technical Field

[0001] This utility model relates to the field of continuous casting technology, and in particular to a stopper rod and continuous casting equipment. Background Technology

[0002] In continuous casting, the stopper rod, by adjusting its position, precisely controls the amount of molten steel flowing from the tundish into the mold, ensuring the quality of the cast billet and the stability of production. During continuous casting, a layer of tundish slag covers the surface of the molten steel in the tundish. This slag comes into contact with the stopper rod surface, and due to high temperature and chemical reactions, a slag line composed of reaction products forms on the stopper rod surface. As the stopper rod's position is adjusted, a slag line region can be formed on it. However, since the stopper rod cannot be replaced during continuous casting, the slag line region needs to have excellent erosion resistance. Furthermore, as the continuous casting time increases, higher requirements are placed on the lifespan of the slag line region to avoid affecting the casting progress.

[0003] Conventional stopper rods are cylindrical in design, making them susceptible to corrosion from molten steel and tundish slag during continuous casting. Furthermore, with prolonged use, tundish slag and cold steel adhere to the slag line area, accelerating erosion and ultimately leading to reduced stopper rod strength, breakage, and forced interruption of the continuous casting process.

[0004] Therefore, the above problems urgently need to be solved. Utility Model Content

[0005] The purpose of this invention is to provide a stopper rod and a continuous casting equipment to reduce the erosion of the stopper rod by tundish slag and improve the service life of the stopper rod.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A stopper rod includes a rod body and a flow-blocking portion. The flow-blocking portion protrudes from the outer peripheral wall of the rod body and extends along the length of the stopper rod. The flow-blocking portion is located in the slag line region on the rod body to change and prolong the flow path of the tundish slag.

[0008] Preferably, the flow-blocking part includes a plurality of elongated protrusions, which are evenly distributed on the outer peripheral wall of the stopper rod.

[0009] Preferably, both ends of any of the protrusions extend outside the slag line region.

[0010] Preferably, the cross-section of the protrusion along the radial direction of the stopper is an arc-shaped surface.

[0011] Preferably, the number of bumps is 10-20.

[0012] Preferably, the rod body and two adjacent protrusions can be joined to form a guide groove.

[0013] Preferably, any of the bumps includes multiple bump units, which are spaced apart.

[0014] Preferably, the rod body and the flow-blocking part are integrally formed.

[0015] Preferably, the flow-blocking part is made of aluminum-carbon material.

[0016] A continuous casting apparatus includes a tundish and a stopper as described above, the stopper being disposed inside the tundish and used to regulate the amount of molten steel output from the tundish.

[0017] The beneficial effects of this utility model are:

[0018] The stopper rod and continuous casting equipment of this invention have a flow-blocking part protruding from the outer peripheral wall of the rod body, which can relatively increase the thickness of the entire stopper rod, thereby improving the erosion resistance of the stopper rod and extending its service life. Furthermore, the flow-blocking part extending along the length of the stopper rod can force the flow direction of the tundish slag to deflect repeatedly when the position of the stopper rod is adjusted, thereby extending the flow path of the tundish slag. During the flow process, the tundish slag needs to bypass the flow-blocking part to contact the rod body, which can further extend the flow path of the tundish slag. The extended flow path of the tundish slag can lead to an increase in the total kinetic energy consumption of the tundish slag, thereby reducing the flow velocity of the tundish slag, and thus reducing the scouring and erosion of the slag line area by the tundish slag, so as to maintain the performance of the stopper rod and extend its service life. Attached Figure Description

[0019] Figure 1 This is a front view of the stopper rod in an embodiment of this utility model;

[0020] Figure 2 yes Figure 1 A cross-sectional view along the radial direction of the stopper rod.

[0021] In the picture:

[0022] 1. Rod body; 11. Slag line area; 2. Flow obstruction section; 21. Protrusion. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0024] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0027] This embodiment proposes a continuous casting device, including a tundish and a stopper rod. The stopper rod is disposed inside the tundish and is used to regulate the amount of molten steel output from the tundish. It can be understood that by adjusting its position, the stopper rod can precisely control the amount of molten steel flowing from the tundish into the crystallizer, ensuring the quality of the cast billet and the stability of production. During continuous casting, a layer of tundish slag covers the surface of the molten steel in the tundish. The tundish slag comes into contact with the surface of the stopper rod, and due to high temperature and chemical reaction, a slag line composed of reaction products forms on the surface of the stopper rod. As the position of the stopper rod is adjusted, a slag line region can be formed on the stopper rod. Compared with traditional stopper rods, the stopper rod proposed in this embodiment can reduce the flow rate of the tundish slag, thereby reducing the scouring and erosion of the slag line region by the tundish slag, ensuring the continuity of the continuous casting process.

[0028] Specifically, please refer to Figure 1 and Figure 2The stopper rod includes a rod body 1 and a flow-blocking part 2 protruding from the outer peripheral wall of the rod body 1. The flow-blocking part 2 extends along the length direction of the stopper rod and is located in the slag line region 11 on the rod body 1, so as to change and extend the flow path of the tundish slag.

[0029] Understandably, the flow-blocking portion 2 protruding from the outer peripheral wall of the rod body 1 can relatively increase the thickness of the entire stopper rod, thereby improving the erosion resistance of the stopper rod and extending its service life. Furthermore, the flow-blocking portion 2, extending along the length of the stopper rod, can force the flow direction of the tundish slag to deflect repeatedly when the position of the stopper rod is adjusted, thereby extending the flow path of the tundish slag. During the flow process, the tundish slag needs to bypass the flow-blocking portion 2 to contact the rod body 1, thereby further extending the flow path of the tundish slag. The extension of the flow path of the tundish slag can lead to an increase in the total kinetic energy consumption of the tundish slag, thereby reducing the flow velocity of the tundish slag, and thus reducing the scouring and erosion of the slag line area 11 by the tundish slag, so as to maintain the performance of the stopper rod and extend its service life.

[0030] In this embodiment, the flow-blocking part 2 includes a plurality of elongated protrusions 21, which are evenly distributed on the outer peripheral wall of the stopper rod. It is understood that during the flow of the tundish slag, the elongated protrusions 21 can generate turbulence that exerts resistance on the tundish slag, thereby reducing its flow velocity. During the flow of the tundish slag, a high-pressure zone is formed on the upstream face of the protrusion 21 and a low-pressure zone is formed on the downstream face of the protrusion 21, thus creating a pressure differential resistance on both sides of the protrusion 21 to further consume the kinetic energy of the tundish slag, thereby further reducing its flow velocity.

[0031] Furthermore, as the number of protrusions 21 increases, the pressure resistance of the tundish slag will increase. However, when the number of protrusions 21 exceeds a critical value, the outer contour formed by all the protrusions 21 tends to be a regular circle, thereby reducing the effect of the flow-blocking part 2 on reducing the flow rate of the tundish slag. The number of protrusions 21 is 10-20, preferably 19.

[0032] Preferably, both ends of any protrusion 21 extend to the outside of the slag line region 11. It is understood that the area where the protrusion 21 extends to the outside of the slag line region 11 can form a transition area, which can prevent the flow velocity of the tundish slag from suddenly increasing when it flows through the end of the slag line region 11, thereby further ensuring that the scouring and erosion caused by the tundish slag to the slag line region 11 is reduced, and thus further improving the service life of the stopper rod.

[0033] In this embodiment, the rod body 1 and two adjacent protrusions 21 can be joined to form a guide groove. During the movement of the stopper rod, the slag in the intermediate package can move along the guide groove, thereby reducing the amount of slag and cold steel adhering to the stopper rod and further extending the service life of the stopper rod. The depth of the guide groove is 7mm-15mm, preferably 13mm.

[0034] In this embodiment, the cross-section of the protrusion 21 along the radial direction of the stopper rod is an arc-shaped surface. It can be understood that the arc-shaped surface is semi-circular or semi-elliptical. The arc-shaped protrusion 21 can guide the tundish slag to flow along the wall, reducing the tundish slag's residence on the surface of the protrusion 21, thereby reducing the rate of chemical erosion and mechanical wear. Furthermore, the outer surface of the arc-shaped protrusion 21 has no sharp edges, allowing for better load distribution, thus improving the service life of the flow-blocking section 2.

[0035] In this embodiment, any bump 21 includes multiple bump units, which are spaced apart. It is understood that during use, the temperature contacted by the bump 21 can reach 1500-1600℃. The segmented bump 21 allows for free expansion after heating, thus preventing cracking due to thermal stress concentration after overall heating. Furthermore, if a single bump unit fails due to thermal stress, it will not affect other bump units, further ensuring the continuity of the stopper rod in the continuous casting process.

[0036] In some other feasible embodiments, the flow-blocking part 2 can also be a spiral rib, which can force the tundish slag fluid to flow along a spiral path, generating centrifugal force, so that the high-speed core flow of the tundish slag is away from the rod 1.

[0037] In this embodiment, the rod body 1 and the flow-blocking part 2 are integrally formed. It is understood that no additional connecting structure is needed between the rod body 1 and the flow-blocking part 2, thereby preventing the flow-blocking part 2 from detaching due to thermal expansion of the connecting structure, ensuring the connection strength between the rod body 1 and the flow-blocking part 2, and further improving the service life of the stopper rod. The integral forming process is preferably isostatic pressing or similar techniques used in the prior art, to facilitate the formation of the elongated protrusion 21.

[0038] In this embodiment, the flow-blocking part 2 is made of aluminum-carbon material. It is understood that aluminum-carbon material is a special refractory material in the prior art, with alumina and carbon as its main components. It has good wear resistance, stability, and thermal stability, thereby further improving the service life of the stopper rod.

[0039] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A stopper rod, comprising a rod body (1), characterized in that, The stopper rod also includes a flow-blocking part (2), which protrudes from the outer peripheral wall of the rod body (1) and extends along the length of the stopper rod. The flow-blocking part (2) is located in the slag line region (11) on the rod body (1) to change and extend the flow path of the tundish slag.

2. The stopper rod according to claim 1, characterized in that, The flow-blocking part (2) includes a plurality of elongated protrusions (21), which are evenly distributed on the outer peripheral wall of the stopper rod.

3. The stopper rod according to claim 2, characterized in that, Along the radial direction of the stopper rod, the cross-section of the protrusion (21) is an arc-shaped surface.

4. The stopper rod according to claim 2, characterized in that, Both ends of any of the protrusions (21) extend to the outside of the slag line region (11).

5. The stopper rod according to claim 2, characterized in that, The number of bumps (21) is 10-20.

6. The stopper rod according to claim 2, characterized in that, The rod (1) and the two adjacent protrusions (21) can be joined to form a guide groove.

7. The stopper rod according to claim 2, characterized in that, Each of the bumps (21) includes multiple bump units, which are spaced apart.

8. The stopper rod according to claim 1, characterized in that, The rod (1) and the flow-blocking part (2) are integrally formed.

9. The stopper rod according to claim 1, characterized in that, The flow-blocking part (2) is made of aluminum carbon material.

10. A continuous casting equipment, characterized in that, It includes an tundish and a stopper as described in any one of claims 1-9, the stopper being disposed inside the tundish and used to regulate the amount of molten steel output from the tundish.

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