Ladle long nozzle
By setting a trumpet-shaped anti-fracture part on the outer wall of the long nozzle body and an anti-adhesion layer on the inner wall, the problems of easy breakage and adhesion of the long nozzle are solved, resulting in a longer service life and higher production efficiency.
Patent Information
- Application Number
- CN202520450167.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-14
AI Technical Summary
Long nozzles are prone to breakage under high-temperature conditions and steel slag easily adheres to their inner walls, leading to frequent replacement and cleaning, which affects casting efficiency.
A long nozzle for a steel ladle was designed, which features a trumpet-shaped anti-fracture section on the outer wall of the body and an anti-adhesion layer on the inner wall. The anti-adhesion layer is made of zirconium oxide material, and is combined with a heat insulation layer and a slag line section to improve strength and anti-adhesion performance.
It improves the fracture resistance of long nozzles, reduces slag adhesion, lowers the frequency of cleaning and replacement, and enhances production efficiency and the smoothness of molten steel flow.
Smart Images
Figure CN223862856U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of long water inlet technology, and in particular to a long water inlet for steel ladles. Background Technology
[0002] The long nozzle is used between the ladle and the tundish to protect the molten steel entering the tundish from secondary oxidation and to prevent splashing. It is an indispensable refractory material for achieving protective casting of molten steel and improving product quality. Molten steel in the ladle enters the tundish through the long nozzle. After the molten steel in the ladle has completely flowed into the tundish, a new ladle filled with molten steel is placed in the ladle, and the above process is repeated.
[0003] In practical applications, a single long nozzle typically needs to be used to cast 9-10 heats of molten steel, lasting 500-600 minutes. During this prolonged casting process, the neck of the long nozzle may break due to oxidation, necessitating replacement. Furthermore, a mixture of steel slag and other materials may adhere to the inner wall of the long nozzle, requiring purging and cleaning after each ladle's casting. When slag adhesion is severe, replacement is also necessary. These issues significantly impact casting efficiency.
[0004] Therefore, there is a need to provide a long nozzle for the ladle to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to provide a long nozzle for steel ladles that is strong and not easily broken, prevents steel slag from adhering to the inner wall, and reduces the frequency of cleaning and replacement of the long nozzle for steel ladles.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] The long nozzle of the steel ladle includes:
[0008] The body comprises a main body and a bowl-shaped opening at the top of the main body. The main body has a molten steel flow channel inside, and the bowl-shaped opening has a liquid outlet inside, which is connected to the molten steel flow channel. The main body includes a main body portion, the inner wall of which is provided with an anti-adhesion layer, and the outer wall of which is provided with a trumpet-shaped anti-fracture portion, one end of which is connected to the bowl-shaped opening.
[0009] Preferably, the thickness of the anti-adhesion layer is 2mm to 4mm.
[0010] Preferably, the anti-adhesion layer is made of zirconium oxide.
[0011] Preferably, the body portion includes a body layer and a heat insulation layer, wherein the heat insulation layer is located between the body layer and the anti-adhesion layer.
[0012] Preferably, the thickness of the insulation layer is 5mm to 8mm.
[0013] Preferably, the long nozzle of the ladle also includes a slag line section, which is disposed on the outer wall of the main body and spaced apart from the anti-fracture section. When the long nozzle of the ladle is in use, the slag line section is immersed in the molten steel in the tundish.
[0014] Preferably, the vertical cross-section of the liquid outlet is arranged in an inverted trapezoidal shape.
[0015] Preferably, the bowl has an air inlet, which is connected to the liquid outlet.
[0016] Preferably, the inner wall of the bowl is provided with a groove, the air inlet is connected to the groove, and the groove is filled with breathable material.
[0017] Preferably, the groove is arranged in a ring around the circumference of the inner wall of the bowl.
[0018] The beneficial effects of this utility model are:
[0019] This long nozzle for a steel ladle includes a main body and a bowl-shaped opening at the top of the main body. The main body has a molten steel flow channel inside, and the bowl-shaped opening has a lower liquid outlet connected to the molten steel flow channel. The main body includes a body section with an anti-adhesion layer on its inner wall and a trumpet-shaped fracture-resistant section on its outer wall, one end of which connects to the bowl-shaped opening. By creating a trumpet-shaped fracture-resistant section on the outer wall of the body section, and ensuring one end connects to the bowl-shaped opening, the fracture-resistant section of this long nozzle for a steel ladle is thicker, resulting in higher strength and less susceptibility to breakage compared to other parts. The anti-adhesion layer on the inner wall of the body section prevents slag from adhering to the inner wall of the long nozzle for a steel ladle during molten steel flow, reducing the risk of blockage. This ensures smooth operation of the long nozzle, reduces the frequency of replacement and cleaning, improves production efficiency, and minimizes problems such as poor molten steel flow caused by blockages in the molten steel pipeline. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of the long nozzle of the steel ladle provided by this utility model.
[0021] In the picture:
[0022] 1. Body; 11. Molten steel flow channel; 12. Body section; 121. Body layer; 122. Insulation layer; 13. Anti-adhesion layer; 14. Fracture-resistant section; 15. Slag line section;
[0023] 2. Bowl opening; 21. Liquid outlet; 22. Air inlet. Detailed Implementation
[0024] 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.
[0025] 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.
[0026] 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.
[0027] 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.
[0028] Long nozzles are used between the ladle and the tundish to protect molten steel entering the tundish from secondary oxidation and to prevent splashing. They are an indispensable refractory material for achieving protective casting of molten steel and improving product quality. Molten steel from the ladle enters the tundish through the long nozzle. After the molten steel has completely flowed into the tundish, a new ladle filled with molten steel is placed in front, and the process is repeated. In practical applications, a single long nozzle typically needs to cast 9-10 heats of molten steel, lasting 500-600 minutes. During this prolonged casting process, the neck of the long nozzle may break due to oxidation, necessitating replacement. Furthermore, a mixture of slag and steel residue can adhere to the molten steel flow channel within the long nozzle, requiring purging and cleaning after each ladle's casting. When slag adhesion is severe, replacement is also necessary. These issues significantly impact casting efficiency.
[0029] To solve the above problems, such as Figure 1 As shown, this embodiment provides a long ladle nozzle. This long ladle nozzle includes a body 1 and a bowl 2 disposed on the top of the body 1. A molten steel flow channel 11 is provided inside the body 1, and a liquid outlet 21 is provided inside the bowl 2, which is connected to the molten steel flow channel 11. The body 1 includes a body portion 12, the inner wall of which is provided with an anti-adhesion layer 13, and the outer wall of which is provided with a trumpet-shaped anti-fracture portion 14, one end of which is connected to the bowl 2. By providing a funnel-shaped anti-fracture section 14 on the outer wall of the main body 12, and having one end of the anti-fracture section 14 connected to the bowl 2, the thickness of the anti-fracture section 14 of this ladle nozzle is made thicker, thus its strength is higher than that of other parts and it is not easy to break. By providing an anti-adhesion layer on the inner wall of the main body 12, it is possible to prevent steel slag from adhering to the inner wall of the ladle nozzle when it flows in the molten steel channel 11, reducing the risk of blockage of the ladle nozzle, thereby ensuring the smooth use of the ladle nozzle, reducing the frequency of replacement and cleaning, improving production efficiency, and reducing the occurrence of problems such as poor molten steel flow caused by blockage of the molten steel pipeline.
[0030] Preferably, the thickness of the anti-adhesion layer 13 is 2mm to 4mm, such as 2mm, 2.5mm, 3mm, 2.5mm, 4mm, etc., but is not limited to the listed values; other unlisted values within this range are also applicable. Within this thickness range, the anti-adhesion layer 13 can effectively form a barrier to prevent molten steel from directly contacting the inner wall of the body portion 12 when flowing in the molten steel channel 11, thus preventing slag from adhering to the inner wall of the body portion 12 and significantly reducing the occurrence of adhesion. This thickness gives the anti-adhesion layer 13 a certain structural strength and stability, enabling it to resist the impact force during molten steel flow, making it less prone to damage or detachment, and ensuring long-term effective anti-adhesion function. Compared to a thicker anti-adhesion layer 13, a thickness of 2mm to 4mm reduces material consumption while ensuring the anti-adhesion effect, helping to reduce production costs.
[0031] In this embodiment, the anti-adhesion layer 13 is made of zirconium oxide. A zirconium oxide coating is applied to the inner wall of the body portion 12 to form a dense film, which is the anti-adhesion layer 13. Preferably, the zirconium oxide content in the zirconium oxide coating is above 90%. Zirconia has high hardness, which enhances its wear resistance after coating, enabling the coating to resist scratches and abrasion from steel slag, thereby reducing the likelihood of adhesion. The zirconium oxide coating has a relatively low surface energy, meaning that its interaction force with the steel slag is weak, thus reducing the tendency to adhere.
[0032] Specifically, the fracture-resistant section 14 is composed of high-strength clay, the main components of which are 60%–70% alumina, 20%–30% carbon, and 5%–10% metal additives. The fracture-resistant section 14 made of this clay has high structural strength, can withstand significant impact forces, and prevents the long nozzle of the ladle from cracking during long-term casting. The fracture-resistant section 14 made of this clay can also effectively resist oxidation, preventing strength reduction due to oxidation, which could lead to the cracking of the long nozzle.
[0033] In this embodiment, please continue to refer to Figure 1 The body portion 12 includes a body layer 121 and a heat insulation layer 122, with the heat insulation layer 122 located between the body layer 121 and the anti-adhesion layer 13. The heat insulation layer 122 serves to insulate against heat, reducing thermal shock to the anti-adhesion layer 13 and enhancing its stability. The body layer 121 and the heat insulation layer 122 use the same clay composition, primarily consisting of 60% alumina, 30% carbon, and 10% metal additives. During firing, an oxidation process is employed to oxidize the inner wall of the body portion 12. Once the oxidation reaches a certain depth, the heat insulation layer 122 is formed, while the remaining portion constitutes the body layer 121.
[0034] In this embodiment, the thickness of the heat insulation layer 122 is 5mm to 8mm, that is, the oxidation depth is 5mm to 8mm. Within this thickness range, the requirements for thermal shock resistance can be met, without increasing the difficulty and time of oxidation due to excessive thickness, thus maximizing economic benefits.
[0035] Specifically, such as Figure 1 As shown, this long ladle nozzle also includes a slag line section 15, which is disposed on the outer wall of the main body section 12 and spaced apart from the fracture-resistant section 14. During use, the slag line section 15 is immersed in the molten steel in the tundish. The slag material used in the slag line section 15 is mainly composed of 80% zirconium oxide and 20% carbon. The slag line section 15 can resist the erosion and scouring of molten steel and slag, thus extending the service life of the long ladle nozzle.
[0036] Preferably, such as Figure 1As shown, the vertical cross-section of the molten steel outlet 21 is an inverted trapezoid. This design makes the molten steel outlet 21 appear to shrink in the vertical direction, which helps to optimize the flow of molten steel and makes the molten steel flow more smoothly and steadily into the ladle nozzle. The inverted trapezoidal design of the molten steel outlet 21 helps to reduce the adhesion of slag to the inner wall of the molten steel outlet 21. Due to the shrinkage of the diameter of the molten steel outlet 21 casting, it is difficult for slag to accumulate on the inner wall during the flow process.
[0037] For details, please refer to [link / reference]. Figure 1 An air inlet 22 is provided on the bowl rim 2, and the air inlet 22 is connected to the liquid outlet 21. Argon gas is blown into the bowl rim 2 through the air inlet 22, so that the part of the bowl rim 2 is an argon gas environment during the steel casting process, preventing oxygen from causing the steel to oxidize.
[0038] Preferably, the inner wall of the bowl 2 is provided with a groove, and the air inlet 22 communicates with the groove. The groove is filled with a breathable material. The breathable material has a certain degree of permeability. Argon gas is directly blown into the breathable material from the air inlet 22 and then blown out from the breathable material. The breathable material has a porous structure, which allows the argon gas blown in from the air inlet 22 to be evenly distributed to all parts of the groove. In this way, when the argon gas enters the liquid outlet 21 from the groove, a uniform airflow can be formed, and the breathable material can buffer the direct impact of the argon gas, avoiding excessive disturbance to the molten steel.
[0039] In this embodiment, the grooves are arranged in a ring along the axial direction of the inner wall of the bowl 2. This ring arrangement allows the grooves to be evenly distributed circumferentially along the inner wall of the bowl 2. When argon gas is blown in through the inlet 22, the gas flow can evenly enter the liquid outlet 21 along the circumference of the bowl 2.
[0040] 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 long nozzle for a steel ladle, characterized in that, include: The body (1) and the bowl (2) set on the top of the body (1) are provided. The body (1) has a molten steel flow channel (11) inside. The bowl (2) has a liquid outlet (21) inside. The liquid outlet (21) is connected to the molten steel flow channel (11). The body (1) includes a body part (12). The inner wall of the body part (12) is provided with an anti-adhesion layer (13). The outer wall of the body part (12) is provided with a trumpet-shaped anti-fracture part (14). One end of the anti-fracture part (14) is connected to the bowl (2).
2. The long nozzle for a steel ladle according to claim 1, characterized in that, The thickness of the anti-adhesion layer (13) is 2mm to 4mm.
3. The long nozzle for a steel ladle according to claim 2, characterized in that, The anti-adhesion layer (13) is made of zirconium oxide.
4. The long nozzle for a steel ladle according to claim 1, characterized in that, The body part (12) includes a body layer (121) and a heat insulation layer (122), wherein the heat insulation layer (122) is located between the body layer and the anti-adhesion layer (13).
5. The long nozzle for a steel ladle according to claim 4, characterized in that, The thickness of the insulation layer (122) is 5mm to 8mm.
6. The long nozzle for a steel ladle according to claim 1, characterized in that, The long nozzle of the ladle also includes a slag line section (15), which is disposed on the outer wall of the main body section (12) and spaced apart from the anti-fracture section (14). When the long nozzle of the ladle is in use, the slag line section (15) is immersed in the molten steel in the tundish.
7. The long nozzle for a steel ladle according to claim 1, characterized in that, The vertical cross-section of the liquid outlet (21) is set in an inverted trapezoidal shape.
8. The long nozzle for a steel ladle according to claim 1, characterized in that, An air inlet (22) is provided on the bowl mouth (2), and the air inlet (22) is connected to the liquid outlet (21).
9. The long nozzle for a steel ladle according to claim 8, characterized in that, The inner wall of the bowl (2) is provided with a groove, the air inlet (22) is connected to the groove, and the groove is filled with breathable material.
10. The long nozzle for a steel ladle according to claim 9, characterized in that, The groove is arranged in a ring around the inner wall of the bowl (2).