Protective device

Abstract

The utility model discloses a protection device, and belongs to the technical field of continuous casting pouring, one end of the protection device is concavely provided with a hole cavity used for containing a long nozzle of a tundish, the end of the protection device extends along the outer side in the circumferential direction to form a port section with an inclined plane, and the other end of the protection device is in a pointed cone shape. The port section is used for blocking liquid when the other end of the protection device is inserted into the liquid. The hole cavity can be in butt joint with the long nozzle of the tundish, in this way, after replacement, the long nozzle of the tundish does not make direct contact with molten steel any more, when the long nozzle is inserted into the molten steel, the covering agent is expanded to the periphery through the pointed cone-shaped structure, then the molten steel and the covering agent are expanded to the outer side in the circumferential direction through the end opening section, blocking is formed, and therefore the long nozzle of the tundish can be conveniently replaced. In this way, in the process of replacing the long nozzle of the tundish, the covering agent can be effectively blocked on the outer side of the molten steel, it is avoided that the cleanliness of the molten steel is reduced, and therefore the casting blank quality is guaranteed.

Description

Technical Field

[0001] This application belongs to the field of continuous casting technology, and in particular relates to a protective device. Background Technology

[0002] The tundish is a refractory container used in short-process steelmaking. It first receives molten steel poured from the ladle, and then distributes it to the various crystallizers through the tundish nozzle. The long nozzle, or protective pipe, is used between the ladle and the tundish to protect the molten steel from secondary oxidation and prevent splashing. It must be preheated before use, otherwise cracking and breakage are likely to occur when pouring begins.

[0003] In the existing technology, during the process of changing the long nozzle in the tundish, the covering agent will be drawn into the molten steel, causing the cleanliness of the molten steel to fail to meet the requirements and affecting the quality of the cast billet. Utility Model Content

[0004] This application aims to at least partially solve the technical problem of covering agent being drawn into molten steel. To this end, this application provides a protective device that can effectively block the covering agent from entering the molten steel during the replacement of the long nozzle in the tundish, thereby avoiding a reduction in the cleanliness of the molten steel and ensuring the quality of the cast billet.

[0005] This application provides a protective device. One end of the protective device is recessed with a cavity for accommodating the long nozzle of the intermediate package. This end of the protective device extends outward along the circumference to form a port segment with an inclined surface. The other end of the protective device is cone-shaped. The port segment is used to block liquid when liquid is inserted into the other end of the protective device.

[0006] In some embodiments, a snap-fit ​​segment and a sealing segment are also included. The two ends of the snap-fit ​​segment are connected to the port segment and the sealing segment, respectively. The sealing segment seals one end of the snap-fit ​​segment. The interior of the snap-fit ​​segment and the sealing segment is a cavity.

[0007] In some implementations, the snap-fit ​​section is cylindrical and the closing section is conical.

[0008] In some implementations, the inclined surface of the port segment is an arc-shaped surface, and the size of the port segment is larger than the size of the snap-fit ​​segment.

[0009] In some embodiments, a plurality of baffles are also included, which are spaced apart on the inner wall of the snap-fit ​​section and are used to fix the long nozzle of the tundish.

[0010] In some embodiments, the baffle is perpendicular to the inner wall of the snap-fit ​​section and extends along both ends of the snap-fit ​​section.

[0011] In some implementations, the baffle near the port section is smaller than the baffle near the closure section in the radial direction of the snap-fit ​​section.

[0012] In some implementations, the baffle is wedge-shaped.

[0013] In some implementations, the thickness of the port segment, snap-fit ​​segment, and enclosure segment is less than or equal to 2 mm.

[0014] In some implementations, the baffle has a radial dimension in the snap-fit ​​section ranging from 5 mm to 10 mm.

[0015] As can be seen from the above technical solution, the beneficial effects of this application are as follows:

[0016] This application allows for connection with the long nozzle of the tundish via a cavity. After replacement, the long nozzle of the tundish is no longer in direct contact with the molten steel. When it is inserted into the molten steel, the cone-shaped structure expands the covering agent outward, and the port section further expands the molten steel and covering agent outward, forming a barrier and reducing the entrainment of covering agent into the molten steel. In this way, this application can effectively block the covering agent outside the molten steel during the replacement of the long nozzle in the tundish, avoiding a decrease in the cleanliness of the molten steel and thus ensuring the quality of the cast billet. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced one by one below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other embodiments and drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A perspective schematic diagram of an embodiment of the protective device of this utility model is shown;

[0019] Figure 2 A top view schematic diagram of an embodiment of the snap-fit ​​segment of this utility model is shown;

[0020] Figure 3 A schematic diagram illustrating the use of an embodiment of the protective device of this utility model is shown;

[0021] Reference numerals: 10, device; 101, cavity; 11, port section; 12, snap-fit ​​section; 13, closed section; 14, baffle; 20, long nozzle. Detailed Implementation

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

[0023] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

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

[0025] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0026] This application is described below with reference to the accompanying drawings and specific embodiments:

[0027] Please refer to Figure 1 According to a first aspect of this application, a protective device 10 is provided. The protective device 10 is made of stainless steel, but other ferrous materials that can dissolve in molten steel at high temperatures can also be used. One end of the protective device 10 is recessed with a cavity 101 for accommodating the elongated nozzle 20 of the tundish. The cavity 101 is recessed, and the end of the tundish or the end of the elongated nozzle 20 is inserted into the molten steel along with the tundish or the elongated nozzle. This end of the protective device 10 extends outward circumferentially, forming a... The port section 11 has an inclined surface, which is the circumferentially outward extension of one end of the opening of the protective device 10. The port section 11 is inclined so that the lower surface of the port section 11 blocks the covering agent and molten steel, while the upper surface of the port section 11 is used to face the long nozzle 20 of the tundish. The other end of the protective device 10 is conical. The conical structure can expand the molten steel and covering agent when the molten steel is inserted. The port section 11 is used to block the liquid when the other end of the protective device 10 is inserted. That is, the lower surface of the port section 11 blocks the molten steel and covering agent to the circumferentially outside.

[0028] In the existing technology, there are no auxiliary tools. During the replacement of the long nozzle 20 in the tundish, the covering agent will be entrained into the molten steel. This is because the long nozzle 20 in the tundish carries the covering agent, which is a powdery material used in metallurgy to cover the surface of the molten steel inside the long nozzle 20 in the tundish. After replacement, the long nozzle 20 in the tundish re-enters the molten steel, which will cover the nozzle with the covering agent. After casting begins, the covering agent is broken into tiny droplets by the steel flow passing through the long nozzle 20 and dispersed in the molten steel. The tiny inclusions originating from the covering agent are liquid phases and are difficult to float and remove, so they remain in the molten steel. Subsequently, they combine with Al2O3 inclusions and evolve into solid calcium aluminate inclusions, which will affect the cleanliness of the molten steel and thus affect the quality of the cast billet. This application allows the long nozzle 20 of the tundish to be connected through the cavity 101. After replacement, the long nozzle 20 of the tundish is no longer in direct contact with the molten steel. When it is inserted into the molten steel, the cone-shaped structure expands the covering agent outward, and the port section 11 further expands the molten steel and covering agent outward, thus forming a barrier and reducing the entrainment of the covering agent into the molten steel. In this way, this application can effectively block the covering agent outside the molten steel during the replacement of the long nozzle 20 in the tundish, avoiding a reduction in the cleanliness of the molten steel and thus ensuring the quality of the cast billet.

[0029] Please refer to Figure 1 In some embodiments, the device 10 further includes a snap-fit ​​section 12 and a sealing section 13. The two ends of the snap-fit ​​section 12 are connected to the port section 11 and the sealing section 13, respectively, as shown in the figure (top, middle, and bottom). The top end of the snap-fit ​​section 12 aligns with the bottom end of the port section 11, and the bottom end of the snap-fit ​​section 12 aligns with the top end of the sealing section 13. The port section 11, snap-fit ​​section 12, and sealing section 13 can all be made of stainless steel. In some embodiments, the thickness of the port section 11, snap-fit ​​section 12, and sealing section 13 is less than or equal to 2 mm, such as 1 mm, 1.5 mm, or 2 mm, making them lightweight and easy to use. To achieve a better transition effect, the port section 11, the snap-fit ​​section 12, and the sealing section 13 can be designed as an integrated structure, which also provides better sealing. The sealing section 13 seals one end of the snap-fit ​​section 12, that is, the sealing section 13 seals the snap-fit ​​section 12 at the bottom. In this way, the end of the long nozzle 20 of the tundish is located inside the cavity 101 and no longer comes into direct contact with the molten steel and the covering agent. The interior of the snap-fit ​​section 12 and the sealing section 13 is the aforementioned cavity 101. The port section 11, the snap-fit ​​section 12, and the sealing section 13 can be designed as a shell, and the cavity 101 has a large space.

[0030] Please refer to Figure 2In some embodiments, the snap-fit ​​section 12 is cylindrical, having an inner diameter and an outer diameter. The outer and inner diameters of the snap-fit ​​section 12 are equal to the outer and inner diameters of the bottom end of the port section 11, respectively. The closing section 13 is conical, as shown in the inverted cone structure in the figure. The outer and inner diameters of the top end of the closing section 13 are equal to the outer and inner diameters of the snap-fit ​​section 12, respectively. In this way, the snap-fit ​​section 12 connects the closing section 13 and the port section 11, providing a certain transition function. In some embodiments, the inclined surface of the port section 11 is arc-shaped, that is, the port section 11 has a curved inclined surface. The outer and inner diameters of the curved portion of the port section 11 are larger than the outer and inner diameters of the snap-fit ​​section 12, respectively. The size of the port section 11 is larger than the size of the snap-fit ​​section 12, that is, the opening of the port section 11 is larger than that of the snap-fit ​​section 12.

[0031] Please refer to Figure 2 In some embodiments, multiple baffles 14 are also included. These baffles 14 are spaced apart on the inner wall of the snap-fit ​​section 12. For example, the baffles 14 may be equidistant and plate-shaped. The baffles 14 serve a limiting function on the inner side of the snap-fit ​​section 12, fixing the long nozzle 20 of the tundish. The number of baffles 14 is determined as needed; for example, four baffles 14 can be used. The edges of the baffles 14 facing the inner side of the snap-fit ​​section 12 can clamp the outer end of the long nozzle 20 of the tundish. In some embodiments, the baffles 14 are perpendicular to the inner wall of the snap-fit ​​section 12 and extend along both ends of the snap-fit ​​section 12, i.e., the baffles 14 are vertically arranged as shown in the figure. The vertical arrangement of the baffles 14 can effectively fix the long nozzle 20 of the tundish. In some embodiments, the baffle 14 near the port section 11 is smaller than the baffle 14 near the closing section 13 in the radial direction of the snap-fit ​​section 12. For example, the size of the baffle 14 gradually increases from the top to the bottom, i.e., as shown in the figure, the baffle 14 becomes wider from top to bottom. In some embodiments, the size of the baffle 14 in the radial direction of the snap-fit ​​section 12 is in the range of [5mm, 10mm], such as 5mm, 8mm, or 10mm, i.e., the widest part of the bottom of the baffle 14 does not exceed 10mm. In some embodiments, the baffle 14 is wedge-shaped and triangular in the side view, so that the baffle 14 can better hold the outer side of the long sprue 20 and prevent it from loosening.

[0032] Please refer to Figure 3In this application, when using the device 10, the end of the long nozzle 20 of the tundish is first inserted into the locking part, and then the device 10 is inserted into the molten steel in the order of the closed section 13 and the locking section 12. The height of the locking part is greater than or equal to the depth to which the long nozzle 20 of the tundish needs to be inserted into the molten steel, which is within the range of [100mm, 200mm], such as 100mm, 150mm or 200mm. In this way, the influence of the covering agent can be avoided when inserting the long nozzle 20 of the tundish. For example, when replacing the long nozzle 20 of a 300t tundish, the device 10 is inserted into the long nozzle 20 from bottom to top, locked, and then inserted into the molten steel. The covering agent does not enter the long nozzle 20 and is not forced into the molten steel. At the same time, the device 10 melts quickly into the molten steel and has no effect on the steel output of the long nozzle 20. By sampling and analyzing the molten steel before and after using the device 10, the number density of inclusions in the molten steel was reduced by 40% after using the device 10, which effectively reduced the inclusions in the molten steel and ensured the cleanliness of the molten steel and the quality of the billet.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," "optional example," or "optional implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0034] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0035] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A protective device, characterized in that, One end of the protective device is recessed with a cavity (101) for accommodating the long nozzle (20) of the intermediate package. This end of the protective device extends outward in a circumferential direction to form a port segment (11) with an inclined surface. The other end of the protective device is cone-shaped. The port segment (11) is used to block liquid when liquid is inserted into the other end of the protective device.

2. The protective device according to claim 1, characterized in that, It also includes a snap-fit ​​section (12) and a closing section (13). The two ends of the snap-fit ​​section (12) are connected to the port section (11) and the closing section (13) respectively. The closing section (13) closes one end of the snap-fit ​​section (12). The interior of the snap-fit ​​section (12) and the closing section (13) is the cavity (101).

3. The protective device according to claim 2, characterized in that, The snap-fit ​​section (12) is cylindrical, and the closed section (13) is conical.

4. The protective device according to claim 2, characterized in that, The inclined surface of the port segment (11) is an arc-shaped surface, and the size of the port segment (11) is larger than the size of the snap-fit ​​segment (12).

5. The protective device according to any one of claims 2-4, characterized in that, It also includes multiple baffles (14), which are spaced apart on the inner wall of the snap-fit ​​section (12) and are used to fix the long nozzle (20) of the tundish.

6. The protective device according to claim 5, characterized in that, The baffle (14) is perpendicular to the inner wall of the snap-fit ​​section (12), and the baffle (14) extends along both ends of the snap-fit ​​section (12).

7. The protective device according to claim 6, characterized in that, In the radial direction of the snap-fit ​​section (12), the baffle (14) near the port section (11) is smaller than the baffle (14) near the closing section (13).

8. The protective device according to claim 7, characterized in that, The baffle (14) is wedge-shaped.

9. The protective device according to claim 5, characterized in that, The thickness of the port segment (11), the snap-fit ​​segment (12), and the closed segment (13) is less than or equal to 2 mm.

10. The protective device according to claim 5, characterized in that, The baffle (14) has a radial dimension range of [5mm, 10mm] on the snap-fit ​​section (12).

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