Continuous casting shroud

Abstract

The utility model relates to metallurgical equipment technical field especially relates to continuous casting long shuikou, this continuous casting long shuikou includes long shuikou main part and protection inner lining, long shuikou main part has the accommodation through -hole along the axial extension, and the protection inner lining is accommodated in the accommodation through -hole, and the protection inner lining has the flow -through hole along the axial extension, and the flow -through hole inside fluid molten steel, and at least one of the outer peripheral wall of protection inner lining and the inner chamber wall of accommodation through -hole is provided with the convex structure, and at least another one of two is provided with recessed structure, and the convex structure and recessed structure on the outer peripheral wall of protection inner lining and the inner chamber wall of accommodation through -hole respectively are mutually adapted and abut together, increase the contact area between the outer peripheral wall of protection inner lining and the inner chamber wall of accommodation through -hole, and the combination strength between long shuikou main part and protection inner lining is improved greatly, prevents the falling of protection inner lining and long shuikou main part, improves the service life of this continuous casting long shuikou.

Description

Technical Field

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

[0002] Continuous casting, also known as continuous steel casting, is an indispensable part of the metallurgical process, connecting steelmaking and rolling, and is also a crucial component of a steel plant. The long nozzle, a key functional refractory material component in continuous casting, is installed between the ladle and the tundish. During continuous casting, molten steel flows from the ladle, passes through the cavity of the long nozzle, and is poured into the tundish. The long nozzle protects the molten steel from secondary oxidation, prevents splashing, and improves the safety of the casting process.

[0003] In related technologies, to improve the service life of existing long nozzles, a cylindrical protective liner is fixed inside the cylindrical nozzle's inner wall, isolating the nozzle's inner wall from the molten steel. Due to ladle replacement, the long nozzle repeatedly undergoes temperature fluctuations during use, generating significant thermal stress inside. Furthermore, the physical properties of the long nozzle and the protective liner differ, and the interface between the long nozzle's cylindrical inner wall and the protective liner's cylindrical outer wall is a smooth surface, resulting in low bonding strength. This internal thermal stress can cause the protective liner to detach from the long nozzle, thus shortening its service life.

[0004] Therefore, there is an urgent need to invent a long nozzle for continuous casting to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a long gate for continuous casting, so as to improve the bonding strength between the long gate body and the protective lining, and to improve the service life of the long gate for continuous casting.

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

[0007] Continuous casting long nozzle, including:

[0008] A long water inlet body, the long water inlet body having an axially extending accommodating through hole; and

[0009] A protective liner, wherein the protective liner is received in the receiving through hole, the protective liner having a guide hole extending axially, the guide hole containing molten steel fluid;

[0010] At least one of the outer peripheral wall of the protective liner and the inner cavity wall of the accommodating through hole is provided with a protruding structure, and at least the other of the two is provided with a recessed structure. The protruding structure and the recessed structure located on the outer peripheral wall of the protective liner and the inner cavity wall of the accommodating through hole respectively are adapted to each other and abut together.

[0011] Alternatively, the protruding structure may have a rectangular, triangular, or semi-circular cross-section.

[0012] The cross-section of the recessed structure is rectangular, triangular, or semi-circular.

[0013] As an optional feature, the thickness of the protective liner is 2 to 8 mm.

[0014] As an optional solution, the thickness of the protective liner remains constant, and the inner diameter of the accommodating through hole gradually increases from one end to the other along the axial direction.

[0015] Alternatively, the thickness of the protective liner remains constant, and the accommodating through hole is axially divided into a first segment, a second segment, and a third segment connected in sequence. The inner diameters of the first segment and the third segment remain constant. The inner diameter of the first segment is smaller than that of the third segment. The inner diameter of the second segment gradually increases from the end closest to the first segment towards the third segment along the axial direction. The maximum inner diameter of the second segment is equal to the inner diameter of the third segment, and the minimum inner diameter of the second segment is equal to the inner diameter of the first segment.

[0016] Alternatively, the thickness of the protective liner remains constant, and the inner diameter of the accommodating through hole remains constant.

[0017] As an optional solution, a docking protrusion is provided at one end of the long nozzle body along the axial direction. The docking protrusion forms a closed annular structure around the axial direction of the long nozzle body. The annular structure is configured to dock with the outer wall of the outlet of the molten steel ladle.

[0018] As an optional solution, the recessed structure has a recessed depth of 1 to 2 mm;

[0019] The protrusion height of the protrusion structure is 1 to 2 mm.

[0020] As an alternative, at least one of the inner wall of the accommodating through hole and the outer peripheral wall of the protective liner is covered with the recessed structure, and at least the other is covered with the protruding structure.

[0021] As an optional solution, the thickness of the main body of the long nozzle is not less than 20mm.

[0022] As an optional solution, the long nozzle for continuous casting also includes:

[0023] Fireproof cotton, which is wrapped around the outer periphery of the main body of the long nozzle.

[0024] As an optional option, the thickness of the fireproof cotton is 2-4 mm.

[0025] The beneficial effects of this utility model are:

[0026] The continuous casting long nozzle provided by this utility model achieves the effect of the long nozzle body being axially fitted onto the outer periphery of the protective liner by setting an axially extending accommodating through hole in the long nozzle body and accommodating the protective liner in the accommodating through hole. By opening a guide hole in the protective liner along the axial direction, molten steel is allowed to flow in the guide hole, achieving the effect of guiding the steel wire from the ladle to the tundish, meeting the transfer requirements of molten steel. By setting a protruding structure on at least one of the outer peripheral wall of the protective liner and the inner cavity wall of the accommodating through hole, the long nozzle can effectively guide the steel wire from the ladle to the tundish, thus meeting the transfer requirements of molten steel. At least one of them is provided with a recessed structure, so that the protruding structure and the recessed structure are adapted to each other and abut together. This not only increases the contact area between the outer peripheral wall of the protective liner and the inner cavity wall of the accommodating through hole, but also utilizes the characteristics of the protruding structure and the recessed structure to replace the originally smooth abutting interface between the outer peripheral wall of the protective liner and the inner cavity wall of the accommodating through hole with an uneven abutting interface. This greatly improves the bonding strength between the long nozzle body and the protective liner, prevents the protective liner from falling off the long nozzle body, and improves the service life of the continuous casting long nozzle. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the continuous casting long nozzle provided in Embodiment 1 of this utility model;

[0028] Figure 2 This is a radial cross-sectional schematic diagram of the continuous casting long nozzle provided in Embodiment 1 of this utility model;

[0029] Figure 3 This is a radial cross-sectional schematic diagram of the long nozzle body provided in Embodiment 1 of this utility model;

[0030] Figure 4 This is a radial cross-sectional schematic diagram of the protective liner provided in Embodiment 1 of this utility model;

[0031] Figure 5 This is a schematic axial cross-sectional view of the continuous casting long nozzle provided in Embodiment 1 of this utility model;

[0032] Figure 6 This is a radial cross-sectional schematic diagram of the continuous casting long nozzle provided in Embodiment 2 of this utility model;

[0033] Figure 7 This is a radial cross-sectional schematic diagram of the continuous casting long nozzle provided in Embodiment 3 of this utility model;

[0034] Figure 8 This is a schematic axial cross-sectional view of the continuous casting long nozzle provided in Embodiment 4 of this utility model;

[0035] Figure 9 This is a schematic axial cross-sectional view of the continuous casting long nozzle provided in Embodiment 5 of this utility model.

[0036] In the picture:

[0037] 100. Main body of the long water inlet; 110. Recessed structure; 120. Accommodating through hole; 121. First section; 122. Second section; 123. Third section; 130. Connecting protrusion;

[0038] 200. Protective lining; 210. Raised structure; 220. Flow guide hole. Detailed Implementation

[0039] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Example 1

[0044] During continuous casting, molten steel flows from the ladle, passes through the cavity of the long nozzle, and is injected into the tundish. The long nozzle protects the molten steel from secondary oxidation, prevents splashing, and improves the safety of the casting process. To extend the service life of existing long nozzles, a cylindrical protective liner is fixed inside the cylindrical nozzle cavity, isolating the inner wall of the long nozzle from the molten steel. Due to ladle replacement, the long nozzle repeatedly undergoes temperature fluctuations during use, generating significant thermal stress inside. Furthermore, the physical properties of the long nozzle and the protective liner differ, and the interface between the cylindrical inner wall of the long nozzle and the cylindrical outer wall of the protective liner is a smooth surface, resulting in low bonding strength. The thermal stress inside the long nozzle can cause the protective liner to detach, thus shortening the long nozzle's service life.

[0045] To solve the above problems, such as Figures 1-5 As shown, this embodiment provides a continuous casting long nozzle. The continuous casting long nozzle includes a long nozzle body 100 and a protective liner 200. The long nozzle body 100 has an axially extending receiving through hole 120. The protective liner 200 is housed in the receiving through hole 120 and has an axially extending guiding hole 220. Molten steel flows in the guiding hole 220. The outer peripheral wall of the protective liner 200 and the inner cavity wall of the receiving through hole 120 are respectively provided with a protruding structure 210 and a recessed structure 110. The protruding structure 210 on the outer peripheral wall of the protective liner 200 and the recessed structure 110 on the inner cavity wall of the receiving through hole 120 are adapted to each other and abut together. The recessed structure 110 on the outer peripheral wall of the protective liner 200 and the protruding structure 210 on the inner cavity wall of the receiving through hole 120 are adapted to each other and abut together.

[0046] The continuous casting long nozzle achieves the effect of axially fitting the long nozzle body 100 onto the outer periphery of the protective liner 200 by providing an axially extending receiving through hole 120 within the long nozzle body 100. A guide hole 220 is provided axially within the protective liner 200, allowing molten steel to flow within it, thus guiding the steel wire from the ladle to the tundish and meeting the requirements for molten steel transfer. A protruding structure 210 is provided on at least one of the outer peripheral wall of the protective liner 200 and the inner wall of the receiving through hole 120, and a recessed structure 110 is provided on at least the other, so that… The protruding structure 210 and the recessed structure 110 located on the outer peripheral wall of the protective liner 200 and the inner cavity wall of the accommodating through hole 120, respectively, are adapted to each other and abut together. This not only increases the contact area between the outer peripheral wall of the protective liner 200 and the inner cavity wall of the accommodating through hole 120, but also, by utilizing the characteristics of the protruding structure 210 and the recessed structure 110, replaces the originally smooth abutting interface between the outer peripheral wall of the protective liner 200 and the inner cavity wall of the accommodating through hole 120 with an uneven abutting interface. This significantly improves the bonding strength between the long nozzle body 100 and the protective liner 200, prevents the protective liner 200 from falling off from the long nozzle body 100, and improves the service life of the continuous casting long nozzle.

[0047] like Figure 1 As shown, on the inner wall of the accommodating through hole 120, along the circumference of the accommodating through hole 120, the recessed structure 110 and the protruding structure 210 are connected in sequence, and a protruding structure 210 is provided between every two adjacent recessed structures 110. On the outer peripheral wall of the protective liner 200, along the circumference of the protective liner 200, the recessed structure 110 and the protruding structure 210 are connected in sequence, and a recessed structure 110 is provided between every two adjacent protruding structures 210, and the cross-sections of the protruding structure 210 and the recessed structure 110 are both semi-circular.

[0048] To further improve the bonding strength between the main body 100 of the long water inlet and the protective liner 200, the inner wall of the accommodating through hole 120 and the outer peripheral wall of the protective liner 200 are both covered with recessed structures 110 and raised structures 210.

[0049] In an optional embodiment, the protrusion height of the raised structure 210 is 1-2 mm, and the recess depth of the recessed structure 110 is 1-2 mm. By limiting the protrusion height of the raised structure 210 to 1-2 mm and the recess depth of the recessed structure 110 to 1-2 mm, the bonding strength between the long nozzle body 100 and the protective liner 200 can be improved, while preventing the raised structure 210 and the recessed structure 110 from reducing the structural strength of the long nozzle body 100 and the protective liner 200, thus ensuring the service life of the continuous casting long nozzle. It should be noted that in this embodiment, the protrusion height of the raised structure 210 is 1.5 mm, and the recess depth of the recessed structure 110 is 1.5 mm. In other embodiments, the protrusion height of the protrusion structure 210 can be any value within the range of 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm or 1 to 2mm, and the recess depth of the recess structure 110 can be any value within the range of 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm or 1 to 2mm. This embodiment does not impose specific limitations.

[0050] Specifically, the thickness of the protective liner 200 is 2–8 mm. It should be noted that in this embodiment, the thickness of the protective liner 200 is 5 mm. In other embodiments, the thickness of the protective liner 200 can be any value within the range of 2 mm, 3 mm, 4 mm, 6 mm, 7 mm, 8 mm, or 2–8 mm; this embodiment does not impose a specific limitation.

[0051] Furthermore, the thickness of the long nozzle body 100 is not less than 20 mm. By limiting the thickness of the long nozzle body 100 to not less than 20 mm, the normal transfer of molten steel by the long nozzle body 100 can be guaranteed. In this embodiment, the thickness of the long nozzle body 100 is 25 mm. In other embodiments, the thickness of the long nozzle body 100 can be arbitrarily adjusted within a range of not less than 20 mm; this embodiment does not impose a specific limitation.

[0052] In this embodiment, as Figure 5 As shown, the thickness of the protective liner 200 remains constant, and the inner diameter of the accommodating through hole 120 remains constant, so that the inner diameter of the guiding through hole 220 inside the protective liner 200 remains constant, ensuring the normal transfer of molten steel.

[0053] In an optional embodiment, a mating protrusion 130 is provided at one axial end of the long nozzle body 100. The mating protrusion 130 forms a closed annular structure around the axial direction of the long nozzle body 100, and the annular structure is configured to mate with the outer wall of the ladle outlet. By providing a mating protrusion 130 at one axial end of the long nozzle body 100, and forming a closed annular structure around the axial direction of the long nozzle body 100, and using the annular structure to mate with the outer wall of the ladle outlet, direct contact between the long nozzle body 100 and the ladle can be avoided, thereby improving the protection of both the long nozzle body 100 and the ladle.

[0054] To further improve the safety of the continuous casting long nozzle, the continuous casting long nozzle also includes fireproof cotton, which is wrapped around the outer periphery of the long nozzle body 100.

[0055] Furthermore, the thickness of the fireproof cotton is 2–4 mm. A thickness of 2–4 mm ensures effective fireproofing of the continuous casting nozzle while minimizing the thickness of the fireproof cotton. It should be noted that in this embodiment, the thickness of the fireproof cotton is 2 mm. In other embodiments, the thickness of the fireproof cotton can be any value within the range of 2.5 mm, 3 mm, 3.5 mm, 4 mm, or 2–4 mm; this embodiment does not impose a specific limitation.

[0056] Example 2

[0057] This embodiment provides a continuous casting long nozzle. The specific structure of the continuous casting long nozzle provided in this embodiment is basically the same as that in Embodiment 1. The difference between the continuous casting long nozzle provided in this embodiment and Embodiment 1 is that the positions of the recessed structure 110 and the raised structure 210 are different.

[0058] like Figure 6 As shown, in this embodiment, the recessed structure 110 is only provided on the inner wall of the accommodating through hole 120, and the protruding structure 210 is only provided on the outer peripheral wall of the protective liner 200. By providing the recessed structure 110 only on the inner wall of the accommodating through hole 120 and the protruding structure 210 only on the outer peripheral wall of the protective liner 200, the processing of the recessed structure 110 and the protruding structure 210 can be facilitated.

[0059] Example 3

[0060] This embodiment provides a continuous casting long nozzle. The specific structure of the continuous casting long nozzle provided in this embodiment is basically the same as that in Embodiment 2. The difference between the continuous casting long nozzle provided in this embodiment and Embodiment 2 is that the cross-sectional shapes of the concave structure 110 and the convex structure 210 are different.

[0061] like Figure 7As shown, the cross-sections of both the protruding structure 210 and the recessed structure 110 are rectangular. In other embodiments, the cross-sections of the protruding structure 210 and the recessed structure 110 may also be triangular or other shapes; this embodiment does not impose specific limitations.

[0062] Example 4

[0063] This embodiment provides a continuous casting long nozzle. The specific structure of the continuous casting long nozzle provided in this embodiment is basically the same as that in Embodiment 1. The difference between the continuous casting long nozzle provided in this embodiment and Embodiment 1 is that the inner diameter of the accommodating through hole 120 is different.

[0064] like Figure 8 As shown, the thickness of the protective liner 200 remains constant, while the inner diameter of the accommodating through-hole 120 gradually increases from one axial end to the other. By setting the inner diameter of the accommodating through-hole 120 to gradually increase from one axial end to the other, while ensuring that the thickness of the protective liner 200 remains constant, the inner diameter of the guiding hole 220 within the protective liner 200 can gradually increase from one axial end to the other. In actual operation, the end with the larger inner diameter of the continuous casting nozzle connects to the inlet of the tundish. The end with the larger inner diameter can accommodate more hot air and molten steel, which helps prevent backflow and molten steel splashing during casting and improves the guiding effect of the guiding hole 220 on molten steel.

[0065] Example 5

[0066] This embodiment provides a continuous casting long nozzle. The specific structure of the continuous casting long nozzle provided in this embodiment is basically the same as that in Embodiment 1. The difference between the continuous casting long nozzle provided in this embodiment and Embodiment 1 is that the inner diameter of the accommodating through hole 120 is different.

[0067] like Figure 9As shown, the thickness of the protective liner 200 remains constant. The accommodating through hole 120 is axially divided into a first segment 121, a second segment 122, and a third segment 123 connected in sequence. The inner diameters of the first segment 121 and the third segment 123 remain constant. The inner diameter of the first segment 121 is smaller than that of the third segment 123. The inner diameter of the second segment 122 gradually increases from the end near the first segment 121 towards the third segment 123 along the axial direction. The maximum inner diameter of the second segment 122 is equal to the inner diameter of the third segment 123, and the minimum inner diameter of the second segment 122 is equal to the inner diameter of the first segment 121. By dividing the accommodating through-hole 120 axially into a first segment 121, a second segment 122, and a third segment 123 connected in sequence, the inner diameters of the first segment 121 and the third segment 123 remain constant. The inner diameter of the second segment 122 gradually increases from the end near the first segment 121 towards the third segment 123 along the axial direction. This ensures that the inner diameter of the first segment 121 is smaller than the inner diameter of the third segment 123, the maximum inner diameter of the second segment 122 is equal to the inner diameter of the third segment 123, and the minimum inner diameter of the second segment 122 is equal to the inner diameter of the first segment 121. By setting the accommodating through-hole 120 into a first segment 121, a second segment 122, and a third segment 123 with unequal inner diameters connected in sequence, the inner diameter of the second segment 122 can be quickly transitioned from the smaller size of the first segment 121 to the larger size of the third segment 123, which can further meet the actual transfer requirements of molten iron.

[0068] 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 other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations 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 continuous casting long nozzle, characterized in that, include: The long water inlet body (100) has an axially extending accommodating through hole (120); as well as A protective liner (200) is disposed in the receiving through hole (120), the protective liner (200) having an axially extending guide hole (220) through which molten steel flows; At least one of the outer peripheral wall of the protective liner (200) and the inner cavity wall of the accommodating through hole (120) is provided with a protruding structure (210), and at least the other of them is provided with a recessed structure (110). The protruding structure (210) and the recessed structure (110) located on the outer peripheral wall of the protective liner (200) and the inner cavity wall of the accommodating through hole (120) respectively are adapted to each other and abut against each other.

2. The continuous casting long nozzle according to claim 1, characterized in that, The protruding structure (210) has a rectangular, triangular, or semi-circular cross-section; The cross-section of the recessed structure (110) is rectangular, triangular, or semi-circular.

3. The continuous casting long nozzle according to claim 1, characterized in that, The thickness of the protective liner (200) is 2-8 mm.

4. The continuous casting long nozzle according to claim 1, characterized in that, The thickness of the protective liner (200) remains constant, and the inner diameter of the accommodating through hole (120) gradually increases as it extends from one end of the axial direction to the other. Alternatively, the thickness of the protective liner (200) remains constant, and the accommodating through hole (120) is axially divided into a first segment (121), a second segment (122), and a third segment (123) connected in sequence. The inner diameters of the first segment (121) and the third segment (123) remain constant. The inner diameter of the first segment (121) is smaller than the inner diameter of the third segment (123). The inner diameter of the second segment (122) gradually increases from one end near the first segment (121) axially toward the third segment (123). The maximum inner diameter of the second segment (122) is equal to the inner diameter of the third segment (123), and the minimum inner diameter of the second segment (122) is equal to the inner diameter of the first segment (121). Alternatively, the thickness of the protective liner (200) remains constant, and the inner diameter of the accommodating through hole (120) remains constant.

5. The continuous casting long nozzle according to claim 1, characterized in that, The long nozzle body (100) is provided with a docking protrusion (130) at one end along the axial direction. The docking protrusion (130) surrounds the long nozzle body (100) to form a closed annular structure. The annular structure is configured to dock with the outer wall of the outlet of the molten steel ladle.

6. The continuous casting long nozzle according to claim 1, characterized in that, The recessed structure (110) has a recessed depth of 1 to 2 mm; The protrusion height of the protrusion structure (210) is 1-2 mm.

7. The continuous casting long nozzle according to claim 1, characterized in that, At least one of the inner wall of the accommodating through hole (120) and the outer peripheral wall of the protective liner (200) is covered with the recessed structure (110), and at least the other of the two is covered with the protruding structure (210).

8. The continuous casting long nozzle according to claim 1, characterized in that, The thickness of the main body (100) of the long water inlet is not less than 20mm.

9. The continuous casting long nozzle according to claim 1, characterized in that, The continuous casting nozzle also includes: Fireproof cotton, which is wrapped around the outer periphery of the long nozzle body (100).

10. The continuous casting long nozzle according to claim 9, characterized in that, The thickness of the fireproof cotton is 2-4 mm.

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