Composite stopper rod head, stopper rod and casting device
By setting a cavity inside the stopper head structure to accommodate the material on the back of the stopper head, and using oxide ceramic material to isolate the molten steel, the problem of stopper head corrosion was solved, and a long service life of the stopper and casting device was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-04-14
AI Technical Summary
Traditional stopper heads are prone to corrosion under high temperature and molten steel erosion, leading to delamination, cracking or breakage, which makes it impossible to effectively control the flow of molten steel and affects the service life of the casting device.
A composite stopper head structure is adopted, with the material on the back of the stopper head placed in the cavity of the stopper head structure and fixedly connected by grooves and protrusions. The stopper head structure made of oxide ceramic material isolates the molten steel to avoid reaction and corrosion.
It improves the corrosion resistance of the stopper head, extends the service life of the stopper and casting device, and enhances the adaptability and stability of the stopper head.
Smart Images
Figure CN224115177U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of flow control technology for casting devices, and in particular to a composite stopper head, stopper, and casting device. Background Technology
[0002] The stopper rod is installed inside the tundish to control the flow rate of molten steel from the tundish to the crystallizer. However, the actual flow control function is achieved by the stopper rod head, which works in conjunction with the bowl of the tundish nozzle to control the flow rate of molten steel. The operating conditions of the stopper rod head are quite harsh, as it needs to withstand high-temperature baking and long-term erosion by molten steel. Traditional stopper rod heads are generally made of alumina-carbon refractories, spinel refractories, or magnesia-carbon refractories. These types of stopper rod heads cannot withstand long-term corrosion, which can lead to severe corrosion, delamination, cracking, or even breakage.
[0003] The prior art discloses a high-throughput, high-performance, long-life stopper rod, including a stopper rod body and a stopper rod head. The stopper rod head is disposed on the lower end face of the stopper rod body. The stopper rod head includes a transition layer, a back material layer of the stopper rod head, and a rod head layer arranged sequentially. The junction between the transition layer and the back material layer of the stopper rod head is serrated, and the junction between the contact surfaces of the back material layer of the stopper rod head and the rod head layer is a combination of a groove and a convex ring. This increases the contact area between the transition layer, the back material layer of the stopper rod head, and the rod head layer, and reduces the phenomenon of delamination, cracking, and fracture among the transition layer, the back material layer of the stopper rod head, and the rod head layer. However, for steel with high calcium content or high oxygen content, the transition layer and part of the back material layer of the stopper rod will react with the molten steel and continue to erode the stopper rod head, thereby causing the stopper rod head to fail and resulting in flow control failure. Utility Model Content
[0004] One of the objectives of this invention is to provide a composite stopper head that can prevent composite stopper head failure, improve the corrosion resistance of the composite stopper head, enhance the adaptability of the composite stopper head, and thus extend the service life of the composite stopper head.
[0005] The second objective of this invention is to provide a stopper rod, which, by using the aforementioned composite stopper rod head, can extend the service life of the stopper rod.
[0006] The third objective of this utility model is to provide a casting device that, by using the aforementioned stopper rod, can extend the service life of the casting device.
[0007] To achieve this objective, the present invention adopts the following technical solution:
[0008] A composite stopper head, disposed on the lower end face of the stopper body, includes:
[0009] The stopper head back material is disposed on the lower end face of the stopper body;
[0010] A stopper head structure has a cavity inside, and the material on the back of the stopper head is placed in the cavity. The first end of the stopper head structure has an opening that communicates with the cavity. One of the outer wall surface of the stopper body and the inner wall surface of the cavity is recessed to form a groove, and the other is protruded to form a protrusion. The protrusion can be fixedly connected to the groove.
[0011] Preferably, the groove is a threaded groove and the protrusion is a thread.
[0012] Preferably, the stopper head structure is made of oxide ceramic material.
[0013] Preferably, the back material of the stopper head is pressed together with the lower end face of the stopper body.
[0014] Preferably, the outer wall surface of the stopper head structure is smoothly transitioned to the outer wall surface of the stopper body.
[0015] Preferably, the contact surfaces of the groove and the protrusion are filled with refractory clay.
[0016] Preferably, the outer surface of the back material of the stopper head is in contact with a portion of the inner wall of the cavity.
[0017] Preferably, multiple grooves and multiple protrusions are provided. The multiple grooves extend along the extension direction of the stopper body and are connected in sequence. The multiple protrusions extend along the extension direction of the stopper body and are connected in sequence. The multiple grooves and multiple protrusions correspond one-to-one.
[0018] A stopper rod includes a stopper rod body and the aforementioned composite stopper rod head, wherein the composite stopper rod head is disposed on the lower end face of the stopper rod body.
[0019] The casting apparatus includes an tundish, a tundish inlet, and the aforementioned stopper rod, wherein a portion of the stopper rod is housed in the tundish, and the composite stopper rod head is capable of blocking the tundish inlet.
[0020] The beneficial effects of this utility model are:
[0021] This utility model provides a composite stopper head, which is disposed on the lower end face of the stopper body and includes a stopper head back material and a stopper head structural component. The stopper head back material is disposed on the lower end face of the stopper body, and the stopper head structural component has a cavity in which the stopper head back material is accommodated. The first end of the stopper head structural component has an opening that communicates with the cavity. One of the outer wall surface of the stopper body and the inner wall surface of the cavity is recessed with a groove, and the other is protruded with a protrusion that can be fixedly connected to the groove.
[0022] By placing the back material of the stopper head into the cavity of the stopper head structure and fixing the stopper head structure to the stopper body, the stopper head structure isolates the back material of the stopper head from the molten steel during casting. The back material of the stopper head is not impacted by the molten steel, avoiding the magnesium-carbon reaction between the molten steel and the back material of the stopper head, preventing the failure of the composite stopper head, improving the corrosion resistance and adaptability of the composite stopper head, and thus extending the service life of the composite stopper head.
[0023] This utility model also provides a stopper rod, which extends the service life of the stopper rod by providing the above-mentioned composite stopper rod head on the lower end face of the stopper rod body.
[0024] This invention also provides a casting device that utilizes the aforementioned stopper rod, thereby extending the service life of the casting device. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the stopper rod provided in an embodiment of the present utility model;
[0026] Figure 2 This is a schematic diagram of the composite stopper head provided in an embodiment of the present invention.
[0027] In the picture:
[0028] 1. Stopper rod body; 11. Groove;
[0029] 2. Composite stopper head; 21. Back material of stopper head; 22. Structural component of stopper head; 221. Cavity; 222. Protrusion. Detailed Implementation
[0030] 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.
[0031] 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.
[0032] 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.
[0033] In the description of this embodiment, the terms "upper," "lower," "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.
[0034] This embodiment provides a composite stopper head 2, such as Figure 1 and Figure 2 As shown, the stopper head back material 21 and the stopper head structural component 22 are disposed on the lower end face of the stopper body 1. The stopper head back material 21 is disposed on the lower end face of the stopper body 1. The stopper head structural component 22 has a cavity 221, and the stopper head back material 21 is housed in the cavity 221. The first end of the stopper head structural component 22 has an opening that communicates with the cavity 221. One of the outer wall surface of the stopper body 1 and the inner wall surface of the cavity 221 is recessed to form a groove 11, and the other is protruded to form a protrusion 222. The protrusion 222 can be fixedly connected to the groove 11.
[0035] By housing the back material 21 of the stopper head within the cavity 221 of the stopper head structure 22 and fixing the stopper head structure 22 to the stopper body 1, the stopper head structure 22 isolates the back material 21 of the stopper head from the molten steel during casting. This prevents the back material 21 from being impacted by the molten steel, avoids the magnesium-carbon reaction between the molten steel and the back material 21, prevents failure of the composite stopper head 2, improves the corrosion resistance and adaptability of the composite stopper head 2, and thus extends its service life. It should be noted that in this embodiment, the back material 21 of the stopper head is conical. In other embodiments, the back material 21 of the stopper head can also be cylindrical or hemispherical, etc. No limitation is made here.
[0036] Optionally, such as Figure 2As shown, in this embodiment, the outer wall surface of the stopper rod body 1 is recessed to form a groove 11, and the inner wall surface of the cavity 221 is protruded to form a protrusion 222. This improves the connection stability between the stopper rod body 1 and the stopper rod head structure 22. In other embodiments, the outer wall surface of the stopper rod body 1 may also be protruded to form a protrusion 222, and the inner wall surface of the cavity 221 may be recessed to form a groove 11, etc. No limitation is made here.
[0037] Specifically, such as Figure 2 As shown, in this embodiment, a protrusion 222 is formed on the inner wall surface of the first end of the stopper head structure 22 of the cavity 221.
[0038] Optionally, such as Figure 2 As shown, in this embodiment, the groove 11 is a threaded groove, and the protrusion 222 is a threaded thread. That is, the protrusion 222 is threadedly connected to the groove 11. The threaded thread and groove can achieve automatic centering during mating, making it easier and more accurate to align the stopper head structure 22 and the stopper body 1, reducing the difficulty of installation and adjustment, improving assembly efficiency and accuracy. Furthermore, the mating between the threaded thread and groove provides a large contact area, enabling a tight fit and effectively preventing relative movement between the stopper head structure 22 and the stopper body 1, thus avoiding contact between the material 21 on the back of the stopper head and the molten steel. In other embodiments, the groove 11 is an arc-shaped groove, the protrusion 222 is an arc-shaped protrusion, the groove 11 and the protrusion 222 are snap-fit connected, or the groove 11 can be a rectangular groove, the protrusion 222 can be a rectangular protrusion, the groove 11 and the protrusion 222 are plug-in connected, etc. No limitations are imposed here.
[0039] Specifically, in this embodiment, the thread profile is triangular, and the corresponding thread groove is also triangular. In other embodiments, the thread profile can be triangular, or it can be an isosceles trapezoid, etc. No limitations are imposed here.
[0040] Optionally, in this embodiment, the contact surface between the groove 11 and the protrusion 222 is filled with refractory clay. The refractory clay effectively fills the gaps and forms a tight seal at the contact surface between the groove 11 and the protrusion 222, preventing molten steel from seeping into the back material 21 of the stopper head through the contact surface, thus preventing erosion of the back material 21 by the molten steel and ensuring the reliability of the composite stopper head 2. Simultaneously, after curing and firing, the refractory clay filled in the contact surface forms a robust whole between the stopper body 1 and the stopper head structure 22, contributing to enhanced stability and integrity of the composite stopper head 2. In other embodiments, the contact surface between the groove 11 and the protrusion 222 can also be filled with alumina-carbon refractory, etc. No limitations are imposed here.
[0041] Furthermore, such as Figure 2As shown, multiple grooves 11 and protrusions 222 are provided. Multiple grooves 11 extend along the extension direction of the stopper rod body 1 and are connected in sequence. Multiple protrusions 222 extend along the extension direction of the stopper rod body 1 and are connected in sequence. The multiple grooves 11 and multiple protrusions 222 correspond one-to-one. The arrangement of multiple grooves 11 and protrusions 222 makes the connection between the stopper rod body 1 and the stopper rod head structure 22 more stable.
[0042] Optionally, such as Figure 2 As shown, there are four grooves 11 and four protrusions 222. In other embodiments, there are two or three grooves 11 and three protrusions 222, or three grooves 11 and two protrusions 222, etc. No limitation is made here.
[0043] Optionally, in this embodiment, the back material 21 of the stopper head is composed of any two of the following: aluminum-carbon refractories, spinel refractories, and magnesium-carbon refractories. It can be aluminum-carbon refractories and spinel refractories, aluminum-carbon refractories and magnesium-carbon refractories, or spinel refractories and magnesium-carbon refractories, etc. No limitation is imposed here.
[0044] Optionally, in this embodiment, the back material 21 of the stopper head is pressed together with the lower end face of the stopper body 1. Press forming increases the density of the back material 21, which enhances its strength, enabling it to withstand the high temperatures of molten steel. Simultaneously, it ensures that different parts of the back material 21 receive the same compaction effect, guaranteeing uniform material properties. This means that the thermal stability and thermal shock resistance of the back material 21 are more consistent across different parts, improving the reliability of the composite stopper head 2. In other embodiments, a transition layer can be provided between the back material 21 and the stopper body 1, an external thread can be provided at the lower end of the stopper body 1, and an internal thread can be provided at the corresponding position on the back material 21. The two can be connected by the engagement of the threads, or the back material 21 and the stopper body 1 can be integrally formed, etc. No limitations are imposed here.
[0045] During the pressing process, four grooves 11 are prefabricated on the outer wall of the stopper rod body 1. Then, the stopper rod body 1 and the back material 21 of the stopper rod head are cured and fired. After firing, refractory clay is used to thread the protrusions 222 on the prefabricated stopper rod head structure 22 to the grooves 11 of the stopper rod body 1.
[0046] Furthermore, the stopper head structure 22 is made of oxide ceramic material. Oxide ceramic material can effectively resist the erosion and corrosion of molten steel. Optionally, in this embodiment, the stopper head structure 22 can be made of alumina, magnesium oxide, or zirconium oxide, etc. In this embodiment, the stopper head structure 22 is preferably made of zirconium oxide. In other embodiments, the stopper head structure 22 can also be made of alumina or magnesium oxide, etc., without limitation, as long as the oxide ceramic material does not contain carbonaceous materials.
[0047] Optionally, in this embodiment, the stopper head structure 22 is a prefabricated structure, which can better ensure the dimensional accuracy and quality stability of the stopper head structure 22. In other embodiments, the stopper head structure 22 can also be a structure fabricated on-site, etc. No limitations are imposed here.
[0048] Optionally, such as Figure 2 As shown, in this embodiment, the outer wall surface of the stopper head structure 22 smoothly transitions with the outer wall surface of the stopper body 1. This smooth transition allows the molten steel to flow more smoothly through the stopper head structure 22, reducing steel separation and preventing impact between the molten steel and the stopper head structure 22, thus avoiding the stopper head structure 22 detaching from the stopper body 1 and ensuring the corrosion resistance of the composite stopper head 2.
[0049] Optionally, such as Figure 2 As shown, the outer surface of the back material 21 of the stopper head is in contact with a portion of the inner wall of the cavity 221. This arrangement ensures that the internal cavity 221 of the stopper head structure 22 is supported by the back material 21, preventing the stopper head structure 22 from shaking due to the impact of molten steel, thus preventing it from detaching from the stopper body 1 and ensuring the stability of the stopper head structure 22. In other embodiments, a portion of the outer surface of the back material 21 may be in contact with the inner wall of the cavity 221, or the outer surface of the back material 21 may be separated from a portion of the inner wall of the cavity 221, etc. No limitation is made here. It should be noted that in this embodiment, the cavity 221 is conical. In other embodiments, the cavity 221 may also be cylindrical or hemispherical, etc. No limitation is made here. Specifically, as... Figure 2 As shown, part of the inner wall surface of cavity 221 is the part of cavity 221 excluding protrusion 222.
[0050] This embodiment also provides a stopper rod, including a stopper rod body 1 and a composite stopper rod head 2, the composite stopper rod head 2 being disposed on the lower end face of the stopper rod body 1. By applying this composite stopper rod head 2, the erosion resistance of the stopper rod is improved, the adaptability of the stopper rod is enhanced, and thus the service life of the stopper rod is extended.
[0051] This embodiment also provides a casting apparatus, including a tundish, a tundish inlet, and a stopper rod. Part of the stopper rod is housed in the tundish, and the composite stopper rod head 2 can block the tundish inlet. This can extend the service life of the casting apparatus. It should be noted that the stopper rod head structure 22 can block the tundish inlet.
[0052] Optionally, such as Figure 2 As shown, in this embodiment, the stopper head structure 22 is a conical cap-shaped structure. The conical structure allows for effective sealing of the tundish nozzle through the tapered compression action. In other embodiments, the stopper head structure 22 can also be a semi-circular cap-shaped structure, etc. No limitation is made here.
[0053] 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 composite stopper head, disposed on the lower end face of the stopper body (1), characterized in that, include: Stopper head back material (21), the stopper head back material (21) is disposed on the lower end face of the stopper body (1); A stopper head structure (22) is provided with a cavity (221) inside. The back material (21) of the stopper head is housed in the cavity (221). The first end of the stopper head structure (22) is provided with an opening that communicates with the cavity (221). One of the outer wall surface of the stopper body (1) and the inner wall surface of the cavity (221) is recessed to form a groove (11), and the other is protruded to form a protrusion (222). The protrusion (222) can be fixedly connected to the groove (11).
2. The composite stopper head according to claim 1, characterized in that, The groove (11) is a threaded groove, and the protrusion (222) is a thread.
3. The composite stopper head according to claim 1, characterized in that, The stopper head structure (22) is made of oxide ceramic material.
4. The composite stopper head according to claim 1, characterized in that, The stopper head back material (21) is pressed into shape with the lower end face of the stopper body (1).
5. The composite stopper head according to claim 1, characterized in that, The outer wall surface of the stopper head structure (22) smoothly transitions to the outer wall surface of the stopper body (1).
6. The composite stopper head according to any one of claims 1-5, characterized in that, The contact surfaces of the groove (11) and the protrusion (222) are filled with refractory clay.
7. The composite stopper head according to any one of claims 1-5, characterized in that, The outer surface of the back material (21) of the stopper head is in contact with a portion of the inner wall of the cavity (221).
8. The composite stopper head according to any one of claims 1-5, characterized in that, Multiple grooves (11) and multiple protrusions (222) are provided. Multiple grooves (11) extend along the extension direction of the stopper body (1) and are connected in sequence. Multiple protrusions (222) extend along the extension direction of the stopper body (1) and are connected in sequence. Multiple grooves (11) and multiple protrusions (222) correspond one-to-one.
9. A stopper rod, characterized in that, It includes a stopper rod body (1) and a composite stopper rod head as described in any one of claims 1-8, wherein the composite stopper rod head is disposed on the lower end face of the stopper rod body (1).
10. A casting apparatus, characterized in that, It includes an intermediate tank, an intermediate tank inlet, and a stopper as described in claim 9, wherein a portion of the stopper is housed in the intermediate tank, and the composite stopper head is capable of blocking the intermediate tank inlet.