Long service life of a protective type of a submerged nozzle

Abstract

The utility model discloses a glaze protection type submerged nozzle with long service life relates to submerged nozzle technical field, including nozzle body, the inside of nozzle body is provided with nozzle straight-through chamber, the inside of nozzle straight-through chamber is provided with detachable inner bush, the outer wall of inner bush is provided with heat buffer layer, the inner wall of inner bush is coated with glaze layer, and the inner bush is connected with nozzle body through sliding fit structure and locking mechanism connection. The utility model discloses a glaze layer realizes the protection, and reliable protection is provided for inner bush, and the service life of inner bush and whole submerged nozzle is prolonged significantly, simultaneously, through the preposition of insert block and slot, the sliding fit of sliding block and sliding slot and the design of locking mechanism, realize the quick, accurate dismounting of inner bush, and bring many conveniences for the maintenance and production of nozzle.

Description

Technical Field

[0001] This utility model relates to the field of immersion gate technology, specifically to a glaze-protected immersion gate with a long service life. Background Technology

[0002] Submerged entry nozzles are key functional refractory material components in continuous steel casting processes. They are installed at the bottom of the tundish and inserted below the molten steel surface in the crystallizer, forming a closed molten steel channel. By sealing the molten steel flow path, they prevent the molten steel from contacting air and reduce the formation of oxide inclusions.

[0003] During continuous casting, the inner wall of the existing submerged nozzle is in direct contact with high-temperature molten steel and slag. Elements such as iron and manganese in the molten steel will react chemically with the nozzle material, causing the inner wall of the nozzle to gradually dissolve, resulting in erosion pits and shortening its service life.

[0004] For example, the argon-free anti-clogging immersion nozzle disclosed in CN216912083U has a high-temperature anti-adhesion coating layer on the inner wall of the upper bowl section, the first connecting section, the slag line section and the nozzle section, which has excellent thermal shock resistance and corrosion resistance. However, after long-term use, the coating layer peels off due to thermal shock, scouring or chemical erosion. Therefore, it is necessary to disassemble the entire nozzle for overall replacement or repair the coating layer, which is complicated and inconvenient.

[0005] Therefore, it is necessary to invent a glaze-protected immersion gate with a long service life to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a long-lasting glaze-protected immersion gate to solve the problem of complex and inconvenient operation that requires disassembling the entire gate for replacement or repairing the coating layer.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a long-service-life glaze-protected immersion sprue, comprising a sprue body, wherein a sprue straight passage cavity is provided inside the sprue body, a removable inner liner is provided inside the sprue straight passage cavity, a heat buffer layer is provided on the outer wall of the inner liner, and a glaze layer is coated on the inner wall of the inner liner. The inner liner and the sprue body are connected by a sliding fit structure and a locking mechanism.

[0008] Preferably, the sliding fit structure includes six sliders evenly distributed circumferentially on the outer wall of the inner liner and six corresponding sliding grooves on the inner wall of the sprue body. The sliders and sliding grooves cooperate with each other to achieve axial limiting and radial positioning of the inner liner. By cooperating with the six sliders evenly distributed circumferentially on the outer wall of the inner liner and the six corresponding sliding grooves on the inner wall of the sprue body, the inner liner can be accurately guided into the interior of the sprue body, ensuring the accuracy of the inner liner's position during installation.

[0009] Preferably, the heat buffer layer adopts a hexagonal honeycomb design, and the heat buffer layer material is selected as silicon carbide fiber reinforced carbon composite material. The honeycomb structure of the heat buffer layer can alleviate this thermal stress concentration phenomenon, reduce the destructive effect of thermal stress on the sprue material, and reduce the risk of cracks and damage caused by thermal stress.

[0010] Preferably, the glaze layer is a glassy phase glaze containing Cr2O3 and Fe2O3, and a dense isolation layer is formed by baking at 800-900℃. This isolation layer is tightly attached to the inner wall of the inner liner, which can effectively prevent direct contact between the molten steel and the substrate material of the inner liner, avoid the erosion and scouring of the inner liner by the molten steel, and protect the integrity of the inner liner material.

[0011] Preferably, the top circumference of the inner liner is evenly distributed with six inserts, and the top surface of the sprue body is provided with slots that match the six inserts for pre-positioning of the inner liner. The pre-positioning structure can ensure that the inner liner is in the correct position and angle during installation, so that the subsequent sliding fit structure and locking mechanism can function smoothly.

[0012] Preferably, the locking mechanism includes a bearing fixed to the top of the nozzle body, a positioning plate hinged to the bearing, and a fixing bolt penetrating the positioning plate. The design of the locking mechanism realizes the disassembly and replacement of the inner liner.

[0013] Preferably, the inner bushing has a threaded hole on its side wall that mates with the threaded fixing bolt. The inner bushing is quickly locked by tightening the fixing bolt. When the fixing bolt is screwed into the threaded hole, a strong locking force is generated through the friction and mechanical meshing between the threads, which firmly fixes the inner bushing in the sprue body, ensuring that the inner bushing will not shift or loosen during use and guaranteeing the normal operation of the sprue.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows: 1. This utility model achieves protection through a glaze layer. The Cr2O3 and Fe2O3 components in the glaze layer impart unique chemical properties, giving it strong corrosion resistance in high-temperature environments. Faced with the corrosion of active components in molten steel, the glaze layer can resist chemical reactions, reducing its own dissolution and damage. Even when subjected to prolonged exposure to high-temperature molten steel, it can maintain a stable structure and performance, continuously providing reliable protection for the inner liner and significantly extending the service life of the inner liner and the entire submersible nozzle. 2. This utility model achieves rapid and precise disassembly and assembly of the inner liner through the pre-positioning of the insert and slot, the sliding cooperation of the slider and groove, and the locking mechanism design, bringing many conveniences to the maintenance and production of the sprue. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 A three-dimensional structural diagram of the locking mechanism of this utility model; Figure 3 This is a three-dimensional cross-sectional structural diagram of the water inlet body and the protective liner of this utility model; Figure 4 This is a front view structural diagram of the inner liner of this utility model in cross section; Figure 5 This is a schematic diagram of the three-dimensional structure of the heat buffer layer and glaze layer of this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Sprue body; 2. Sprue through cavity; 3. Inner bushing; 4. Slider; 5. Slide groove; 6. Heat buffer layer; 7. Glaze layer; 8. Insert block; 9. Slot; 10. Locking mechanism; 1001. Shaft seat; 1002. Positioning plate; 1003. Fixing bolt; 1004. Screw hole. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] This utility model provides, for example Figure 1-5 The above describes a long-life glaze-protected immersion sprue, comprising a sprue body 1, an internal sprue straight passage cavity 2, a removable inner liner 3 inside the sprue straight passage cavity 2, a heat buffer layer 6 on the outer wall of the inner liner 3, and a glaze layer 7 coated on the inner wall of the inner liner 3. The heat buffer layer 6 adopts a hexagonal honeycomb design and is made of silicon carbide fiber reinforced carbon composite material. The glaze layer 7 is a glass phase glaze containing Cr2O3 and Fe2O3, and is formed into a dense isolation layer by baking at 800-900℃.

[0019] In this embodiment, the hexagonal honeycomb structure of the heat buffer layer 6 has a large surface area and a special geometry, which can effectively disperse and absorb heat, uniformly distribute thermal stress, and avoid excessive concentration of thermal stress in local areas. This reduces the destructive effect of thermal stress on the sprue material and reduces the risk of cracks and damage caused by thermal stress. Furthermore, the silicon carbide fiber-reinforced carbon composite material (C / SiC) has excellent high-temperature performance, including high strength, high modulus, good oxidation resistance, and thermal stability. Under high-temperature environments, the heat buffer layer 6 can maintain the integrity and stability of the structure and is not easily damaged. Deformation, softening, or decomposition occur, providing reliable thermal protection for the submerged nozzle. Furthermore, the glassy phase glaze containing Cr2O3 and Fe2O3 has special chemical and physical properties that enhance the corrosion resistance of the glaze layer 7. Under the action of high-temperature molten steel, the glaze layer 7 can resist the corrosion of various chemical components in the molten steel, reduce the dissolution and damage of the glaze layer 7 by the molten steel, maintain the structural and performance stability of the glaze layer 7, further extend the service life of the inner liner 3, and ensure that the nozzle body 1 can work stably for a long time under the scouring of high-temperature molten steel, thus extending the service life of the nozzle body 1.

[0020] The inner liner 3 is connected to the sprue body 1 by a sliding fit structure and a locking mechanism 10. The sliding fit structure includes six sliders 4 evenly distributed around the outer wall of the inner liner 3 and six corresponding grooves 5 on the inner wall of the sprue body 1. The sliders 4 and grooves 5 cooperate with each other to achieve axial limiting and radial positioning of the inner liner 3. Six inserts 8 are evenly distributed around the top of the inner liner 3. The top surface of the sprue body 1 is provided with slots 9 that match the six inserts 8 for pre-positioning of the inner liner 3. The locking mechanism 10 includes a bearing 1001 fixed to the top of the sprue body 1, a positioning plate 1002 hinged to the bearing 1001, and a fixing bolt 1003 penetrating the positioning plate 1002. The side wall of the inner liner 3 is provided with a screw hole 1004 that is threadedly engaged with the fixing bolt 1003. The inner liner 3 is quickly locked by tightening the fixing bolt 1003.

[0021] In this embodiment, the slider 4 and the groove 5 cooperate to not only accurately guide the inner bushing 3 into the nozzle body 1, ensuring the accuracy of the inner bushing 3's position during installation and making the relative positional relationship between the inner bushing 3 and the nozzle body 1 meet the design requirements, but also the cooperation structure of the slider 4 and the groove 5 effectively prevents the inner bushing 3 from moving in the axial direction and wobbling in the radial direction. Furthermore, the insertion block 8 and the slot 9 cooperate to provide a pre-position for the installation of the inner bushing 3. When installing the inner bushing 3, the operator only needs to align the insertion block 8 with the slot 9 and insert it to quickly and accurately determine the approximate position of the inner bushing 3, avoiding errors caused by improper insertion. To prevent installation difficulties or positional deviations caused by blind installation, the inner bushing 3 is further ensured to be in the correct position and angle during installation. At the same time, the locking mechanism 10 can firmly lock the inner bushing 3 inside the nozzle body 1. After the inner bushing 3 is installed in place, the positioning plate 1002 is rotated to contact the inner bushing 3, and then the fixing bolt 1003 is tightened. The fixing bolt 1003 and the threaded engagement of the screw hole 1004 on the side wall of the inner bushing 3 generate sufficient locking force to prevent the inner bushing 3 from loosening or falling off due to vibration, impact or molten steel pressure during use, and to ensure a stable and reliable connection between the inner bushing 3 and the nozzle body 1.

[0022] Working principle of this utility model: Refer to the instruction manual appendix Figure 1-5 When using this utility model, firstly, when it is necessary to install the inner bushing 3, loosen the fixing bolt 1003 that passes through the positioning plate 1002. After the fixing bolt 1003 is completely loosened, remove it from the screw hole 1004 on the side wall of the positioning plate 1002 and the inner bushing 3. The operator gently rotates the positioning plate 1002 by hand so that it rotates around the hinge axis and disengages from the inner bushing 3. Then, the operator holds the inner bushing 3 with both hands and slowly and steadily pulls it upward so that the inner bushing 3 slides out from the inside of the sprue body 1 along the axial direction and can be removed. When it is necessary to disassemble the inner liner 3, the operator holds the inner liner 3 and slides the slider 4 downwards along the six grooves 5 corresponding to the inner wall of the sprue body 1. At the same time, the six evenly distributed inserts 8 on the top circumference of the inner liner 3 are aligned and inserted into the slots 9 on the top surface of the sprue body 1. When the inner liner 3 can no longer be pushed, it means that the inner liner 3 has reached the installation position. At this time, the slider 4 and the grooves 5 cooperate to achieve axial limiting and radial positioning of the inner liner 3, ensuring that the inner liner 3 is in contact with the water. The relative positional relationship between the inlet body 1 meets the design requirements. Then, the operator rotates the positioning plate 1002 fixed on the bearing 1001 at the top of the inlet body 1 around the hinge axis, so that the positioning plate 1002 contacts the top of the inner bushing 3. After the positioning plate 1002 is in close contact with the top of the inner bushing 3, the fixing bolt 1003 is inserted through the positioning plate 1002 and aligned with the screw hole 1004 on the side wall of the inner bushing 3. Finally, the fixing bolt 1003 is tightened to achieve stable installation of the inner bushing 3.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A long-service-life glaze-protected immersion sprue, comprising a sprue body (1), characterized in that: The sprue body (1) has a sprue through cavity (2) inside, and a detachable inner liner (3) is provided inside the sprue through cavity (2). The outer wall of the inner liner (3) is provided with a heat buffer layer (6), and the inner wall of the inner liner (3) is coated with a glaze layer (7). The inner liner (3) and the sprue body (1) are connected by a sliding fit structure and a locking mechanism (10).

2. The long-service-life glaze-protected immersion gate according to claim 1, characterized in that: The sliding fit structure includes six sliders (4) evenly distributed circumferentially on the outer wall of the inner bushing (3) and six corresponding sliding grooves (5) on the inner wall of the sprue body (1). The sliders (4) and the sliding grooves (5) cooperate with each other to realize the axial limiting and radial positioning of the inner bushing (3).

3. The long-service-life glaze-protected immersion gate according to claim 1, characterized in that: The heat buffer layer (6) adopts a hexagonal honeycomb design, and the material of the heat buffer layer (6) is silicon carbide fiber reinforced carbon composite material.

4. The long-service-life glaze-protected immersion gate according to claim 1, characterized in that: The glaze layer (7) is a glass phase glaze containing Cr2O3 and Fe2O3, and a dense isolation layer is formed by baking at 800-900℃.

5. The long-service-life glaze-protected immersion nozzle according to claim 2, characterized in that: The top circumference of the inner liner (3) is evenly distributed with six inserts (8), and the top surface of the sprue body (1) is provided with slots (9) that match the six inserts (8) for pre-positioning of the inner liner (3).

6. The long-service-life glaze-protected immersion gate according to claim 1, characterized in that: The locking mechanism (10) includes a bearing (1001) fixed to the top of the nozzle body (1), a positioning plate (1002) hinged to the bearing (1001), and a fixing bolt (1003) passing through the positioning plate (1002).

7. The long-service-life glaze-protected immersion gate according to claim 4, characterized in that: The inner bushing (3) has a screw hole (1004) on its side wall that is threaded to the fixing bolt (1003). The inner bushing (3) can be quickly locked by tightening the fixing bolt (1003).

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