A continuous casting tundish stopper capable of suppressing vortex

Abstract

The application discloses a continuous casting tundish stopper capable of inhibiting vortex, which comprises a stopper body, a baffle and a rib plate, the lower part of the stopper body is provided with the baffle and the rib plate, the upper end surface of the baffle is perpendicular to the center line of the stopper body, the side surface of the baffle forms a certain angle with the vertical direction, the rib plate is uniformly arranged along the vertical direction, and the rib plate is perpendicular to the horizontal plane; the outer wall of the stopper body, the adjacent baffle and the adjacent rib plate jointly enclose a cavity with a certain volume, and the number of the cavities is multiple. The application can separate and block the confluence vortex layer by layer by only changing the lower structure of the stopper, can effectively inhibit the confluence vortex, prevent the slag from entering the water gap, effectively reduce the tundish molten steel casting allowance, improve the metal yield, reduce the casting allowance treatment workload, and has the advantages of easy production, low cost, convenient operation and the like.

Description

Technical Field

[0001] This invention relates to the field of continuous casting tundish flow control technology, specifically to a continuous casting tundish stopper rod that can suppress vortices. Background Technology

[0002] In continuous casting, the tundish is a crucial metallurgical reactor, performing functions such as pressure reduction, flow stabilization, purification, and diversion. Its functions are continuously being expanded to include heating and refining. The stopper rod is a vital flow control device in the continuous casting tundish process, used to control the flow rate of molten steel from the tundish to the crystallizer and the liquid level in the crystallizer. A flow phenomenon exists in the molten steel in the tundish: when the liquid level falls below a certain critical height, converging vortices are generated above the tundish nozzle. These vortices are prone to form during the initial pouring, continuous pouring, sudden changes in casting speed, and the final stages of casting. When these vortices form, slag from the surface is drawn into the molten steel, causing mixing of the metallic and liquid phases, and even air entrainment. All of these factors increase secondary oxidation of the molten steel, reduce its cleanliness, and deteriorate the quality of the cast billet. Especially towards the end of the casting process, in order to prevent slag from being trapped by the formation of converging vortices, casting must be stopped before the liquid level reaches the critical height. This results in a large amount of molten steel remaining in the tundish, which reduces the metal yield and increases the workload of handling the remaining molten steel.

[0003] Patent CN102825229A discloses a flow control structure to prevent vortices from forming inside the tundish. The technical solution involves a stopper rod with a hollow, inverted conical tubular funnel at its lower end covering the submersible nozzle outlet below. This prevents vertically flowing molten steel from being drawn into the nozzle, forcing it to enter horizontally, thus suppressing converging vortices above the nozzle outlet. However, in practice, strict alignment of the stopper rod center and the nozzle center is crucial to ensure a good seal between the lower end of the stopper rod and the seat brick groove, which presents a challenge. Furthermore, while vertically flowing molten steel is prevented from being drawn into the nozzle, slag entrained after a converging vortex forms can also be carried into the nozzle.

[0004] Patent CN108907170A discloses a method for suppressing vortex generation at the nozzle during metallurgical processes. The method involves driving a stopper rod inside the ladle to rotate in the opposite direction to the vortex's rotation direction during the final stages of ladle casting, thereby reducing the tangential velocity of the fluid. However, this method requires a rotating device mounted on the upper part of the stopper rod, presenting certain challenges. Furthermore, it necessitates careful consideration of the appropriate start-up timing and rotational speed, resulting in high control requirements.

[0005] Patent No. CN108380862A discloses a continuous casting anti-slag plug rod. Its technical solution is to reduce or even eliminate the generation of vortex in the tundish steel flow and reduce the risk of slag entrapment by utilizing the unique shape of the anti-slag functional section of the continuous casting anti-slag plug rod. However, its effect is not ideal.

[0006] Therefore, it is necessary to develop a flow control technology that can suppress confluence vortices and prevent slag from entering the water inlet. Summary of the Invention

[0007] The purpose of this invention is to provide a continuous casting tundish plug rod that is easy to manufacture, low in cost, and convenient to operate, used to suppress converging vortices and prevent slag from entering the nozzle, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a stopper rod for continuous casting tundish that can suppress vortices, comprising a stopper rod body, a baffle, and ribs. The lower part of the stopper rod body is provided with a baffle and ribs. The upper end face of the baffle is perpendicular to the center line of the stopper rod body. The baffle and the side of the stopper rod body form a certain angle with the vertical direction, and ribs are uniformly provided along the vertical direction. The ribs are perpendicular to the horizontal plane. The outer wall of the stopper rod body, adjacent baffles, and adjacent ribs together form a cavity with a certain volume, and there are multiple cavities.

[0009] Preferably, the diameter of the stopper rod body is the same as the diameter of the stopper rod body of the continuous casting tundish actually used.

[0010] Preferably, the number of baffles is 3-8, and they are evenly arranged at the lower part of the stopper rod body. There is a certain distance between adjacent baffles, and the distance between the upper end face of the uppermost baffle and the bottom of the stopper rod body head is 0.35-0.45 times the working liquid level height of the tundish. The diameter of the outer edge of the uppermost baffle is 1.4-1.6 times the diameter of the stopper rod body. From top to bottom, the diameter of the outer edge of the baffle increases sequentially. The difference between the outer edge diameter of the lowermost baffle and the outer edge diameter of the uppermost baffle is 80-160mm.

[0011] Preferably, the number of ribs is 3-8, and one outer side of the rib is tangent to the outer edge of the baffle.

[0012] Preferably, the stopper rod body is disposed inside the intermediate bag, the upper end of the stopper rod body is fixed to the transverse support arm, the other end of the support arm is fixed to the lifting device, and the lifting device is fixed to the outside of the intermediate bag body.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] 1. The continuous casting tundish stopper rod that can suppress vortices only requires modification to the lower part of the main structure of the stopper rod, by setting up a baffle and ribs, without any other modifications. Therefore, it is easy to manufacture, low in cost, and convenient to operate.

[0015] 2. The continuous casting tundish stopper rod, which can suppress vortices, has the function of separating and blocking the converging vortices due to the setting of the baffle and rib, and can effectively suppress the formation of converging vortices.

[0016] 3. The continuous casting tundish stopper rod, which can suppress vortices, has an increasing diameter from top to bottom along the outer edge of the baffle, and the cavity structure formed by the outer wall of the stopper rod body, adjacent baffles, and adjacent ribs plays a layer-by-layer blocking role. Even if the converging vortex causes slag to be rolled up, the slag will be allowed to enter the cavity, effectively preventing slag from entering the nozzle and improving the cleanliness of the molten steel in the crystallizer.

[0017] 4. The continuous casting tundish stopper rod, which can suppress vortex formation, can effectively suppress the formation of converging vortices and prevent slag from entering the nozzle. Therefore, it can reduce the casting allowance in the tundish, improve the metal yield, and reduce the workload of handling casting allowance in the tundish. The entire continuous casting tundish stopper rod has the advantages of being easy to manufacture, low in cost, convenient to operate, and effectively suppressing converging vortices and preventing slag from entering the nozzle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a top view of the present invention;

[0020] Figure 3 This is a schematic diagram of the installation structure of the present invention.

[0021] In the diagram: 1. Stopper rod body; 2. Baffle; 3. Rib plate; 4. Support arm; 5. Intermediate liner; 6. Lifting device. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1:

[0024] from Figure 1-2As can be seen, a continuous casting tundish stopper rod that can suppress vortices includes a stopper rod body 1, a baffle 2, and a rib 3. The lower part of the stopper rod body 1 is provided with the baffle 2 and the rib 3. The upper end face of the baffle 2 is perpendicular to the center line of the stopper rod body 1. The baffle 2 and the side of the stopper rod body 1 form a certain angle with the vertical direction, and the rib 3 is uniformly provided along the vertical direction. The rib 3 is perpendicular to the horizontal plane. The outer wall of the stopper rod body 1, the adjacent baffle 2, and the adjacent rib 3 together form a cavity with a certain volume, and there are multiple cavities.

[0025] In the above embodiment, the diameter of the stopper rod body 1 is the same as the diameter of the stopper rod body 1 of the continuous casting tundish actually used.

[0026] In the above embodiment, there are 5 baffles 2, which are evenly arranged at the lower part of the stopper rod body 1. There is a certain distance between adjacent baffles 2, and the distance between the upper end face of the uppermost baffle 2 and the bottom of the stopper rod body 1 is 0.4 times the working liquid level height of the tundish. The diameter of the outer edge of the uppermost baffle 2 is 1.5 times the diameter of the stopper rod body 1. From top to bottom, the diameter of the outer edge of the baffle 2 increases sequentially. The difference between the outer edge diameter of the lowermost baffle 2 and the outer edge diameter of the uppermost baffle 2 is 120mm.

[0027] In the above embodiment, there are 4 ribs 3, and one outer side of the rib 3 is tangent to the outer edge of the baffle 2.

[0028] from Figure 3 As can be seen, during installation, the stopper rod body 1 is placed inside the tundish 5. The upper end of the stopper rod body 1 is fixed on the horizontal support arm 4, and the other end of the support arm 4 is fixed on the lifting device 6. The lifting device 6 is fixed on the outside of the tundish body 5 to control the height of the stopper rod body 1, thereby controlling the steel flow rate and the liquid level height of the crystallizer.

[0029] Working principle: The continuous casting tundish stopper rod, which can suppress vortices, has a baffle 2 and a rib 3 at the bottom, which can separate and block the converging vortices. When the liquid level in the tundish 5 is lower than the critical height of the converging vortex, it can effectively suppress the formation of the converging vortex. Under the combined action of the baffle 2 and the rib 3, even if the converging vortex causes slag to be rolled up, the slag will enter the cavity formed by the outer wall of the stopper rod body 1, the adjacent baffle 2 and the adjacent rib 3. The diameter of the outer edge of the baffle 2 increases from top to bottom. As the liquid level in the tundish 5 continues to decrease, the cavities at different heights will accommodate the slag rolled up by the molten steel at different liquid levels, playing a layer-by-layer blocking role, and finally achieving the purpose of preventing slag from entering the nozzle.

[0030] Example 2:

[0031] A continuous casting tundish stopper rod capable of suppressing vortices is identical to that in Example 1, except for the following technical parameters.

[0032] The number of baffles 2 is 3-4 or 6-8; the distance between the upper end face of the uppermost baffle 2 and the bottom of the stopper rod body 1 is 0.35-0.40 or 0.40-0.45 times the working liquid level height of the intermediate drum 5; the diameter of the outer edge of the uppermost baffle 2 is 1.4-1.5 or 1.5-1.6 times the diameter of the stopper rod body 1; the difference between the outer edge diameter of the lowermost baffle 2 and the outer edge diameter of the uppermost baffle 2 is 80-120mm or 120-160mm.

[0033] In this embodiment, the number of ribs 3 is 3 or 5-8.

[0034] In summary, this continuous casting tundish stopper rod, which can suppress vortices, only requires modification to the lower part of the stopper rod body 1 by adding baffles 2 and ribs 3, without any other modifications. Therefore, it is easy to manufacture, low in cost, and convenient to operate. Secondly, due to the setting of baffles 2 and ribs 3, it has the function of separating and blocking converging vortices, effectively suppressing the formation of converging vortices. Furthermore, the arrangement of baffles 2 with progressively increasing outer diameters from top to bottom, along with the cavity formed by the outer wall of the stopper rod body 1, adjacent baffles 2, and adjacent ribs 3, further enhances its advantages. The structure acts as a layered barrier, preventing slag from entering the cavity even if the converging vortex causes slag entrainment, thus improving the cleanliness of the molten steel in the crystallizer. Furthermore, because this invention effectively suppresses the formation of converging vortices and prevents slag from entering the nozzle, it reduces the amount of molten steel left in the tundish, increases metal yield, and reduces the workload of handling tundish casting residue. The entire continuous casting tundish stopper rod has the advantages of being easy to manufacture, low in cost, convenient to operate, and effectively suppressing converging vortices and preventing slag from entering the nozzle.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous casting tundish stopper capable of suppressing vortex, comprising a stopper body (1), a baffle (2) and a rib plate (3), characterized in that: The lower part of the stopper body (1) is provided with a baffle (2) and a rib plate (3), the upper end surface of the baffle (2) is perpendicular to the center line of the stopper body (1), the baffle (2) and the side surface of the stopper body (1) form a certain angle in the vertical direction, and the rib plate (3) is uniformly arranged in the vertical direction, and the rib plate (3) is perpendicular to the horizontal plane; the outer wall of the stopper body (1), the adjacent baffle (2) and the adjacent rib plate (3) jointly form a cavity with a certain volume, and the number of cavities is multiple; The number of baffles (2) is 3-8, and they are uniformly arranged in the lower part of the stopper body (1), there is a certain distance between the adjacent baffles (2), and the distance between the upper end surface of the uppermost baffle (2) and the bottom of the stopper body (1) is 0.35-0.45 times the working liquid level height of the tundish; the diameter of the outer edge of the uppermost baffle (2) is 1.4-1.6 times the diameter of the stopper body (1), and the diameter of the outer edge of the baffle (2) increases from top to bottom, the difference between the outer edge diameter of the lowermost baffle (2) and the outer edge diameter of the uppermost baffle (2) is 80-160mm; the number of rib plates (3) is 3-8, and one outer side surface of the rib plate (3) is tangent to the outer edge of the baffle (2).

2. The vortex-suppressible continuous-casting tundish stopper rod according to claim 1, characterized by: The diameter of the stopper body (1) is the same as that of the actual continuous casting tundish stopper body (1).

3. The vortex-suppressible continuous-casting tundish stopper rod according to claim 1, characterized by: The stopper body (1) is arranged in the tundish (5), the upper end of the stopper body (1) is fixed on the horizontal support arm (4), the other end of the support arm (4) is fixed on the lifting device (6), and the lifting device (6) is fixed on the outer side of the tundish (5).

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