Tool for simplifying and improving centering of multi-section mixed pouring submersed nozzle

Abstract

The utility model relates to the technical field of continuous casting, in particular to a tool for simplifying and improving centering of a multi-section mixed casting submersed nozzle, which comprises a centering platform and a plurality of bottom plates detachably placed on the centering platform. Two sides of the centering platform are provided with graduated scales, the bottom plate is provided with a bottom plate through hole, the position of the bottom plate through hole is adjusted according to a casting center line of a corresponding casting section specification, and the bottom plate through hole is positioned through the graduated scales. The submerged nozzle has the advantages that the centers of the multiple bottom plate through holes coincide with the casting center line of multi-section mixed casting, the centering work of multiple sections is simplified into the centering work of one nozzle, the centering difficulty is greatly reduced, the situation that due to the fact that the sections are different, a submerged nozzle is not centered, a molten steel flow field is asymmetrical, and the service life of the submerged nozzle is prolonged is avoided. Temperature field distribution and solidified blank shell thickness are not uniform, steel leakage and slag entrapment risks are increased, and the surface quality defect is overcome, and the production safety coefficient is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of continuous casting technology, and in particular to a tool for simplifying and improving the alignment of multi-section mixed-casting submersible nozzles. Background Technology

[0002] In recent years, the steel market has faced increasingly severe challenges. Optimizing product structure is crucial for the survival and development of steel enterprises, with increasing the development of high-quality special steel being a key focus. However, the characteristics of the high-quality special steel market—small batches, numerous specifications, and diverse varieties—severely restrict the realization of economies of scale in the steel industry. A single continuous casting machine can achieve mixed casting of multiple cross-sections, reducing frequent start-ups and shutdowns, minimizing scrap at the billet head and tail, lowering consumption of refractory materials and continuous casting auxiliary materials in the tundish, reducing labor intensity, effectively improving steelmaking-continuous casting production efficiency, reducing process costs, and greatly enhancing the market adaptability of steel enterprises.

[0003] In steelmaking plants, the transfer process of molten steel from the tundish into the crystallizer employs a "submerged entry nozzle + protective slag" model to prevent air contamination of the molten steel. The submerged entry nozzle is crucial for protecting the molten steel during the casting process. However, when multiple sections of a continuous casting machine are used for mixed casting, the varying radii of the cast billets create difficulties in simultaneously aligning the submerged entry nozzles during casting. Without proper nozzle alignment, the molten steel flow field becomes asymmetrical, leading to uneven temperature distribution and solidified billet shell thickness. This results in uneven lateral thermal stress, increasing the risk of leaks, slag entrapment, and surface quality defects.

[0004] Chinese invention patent application CN117463960 A discloses a device and method for mixed casting of multiple cross-section specifications in continuous casting. Based on the required cross-sections for simultaneous casting, a reference cross-section is determined. The relative position of the convex portion of each nozzle adjustment and conversion device is determined by the distance d between the pouring center line of the corresponding specification of the crystallizer assembly and the pouring center line of the corresponding specification of the crystallizer assembly for other specifications. Finally, the nozzle adjustment and conversion devices for each cross-section are installed on the bottom shell of the tundish and fixed with bolts. The tundish nozzle on the convex portion of the nozzle adjustment and conversion device is aligned with the seat brick hole on the nozzle seat brick, and the gaps around them are smoothed with refractory mortar. This solution simplifies the mixed casting of multiple cross-sections. However, the nozzle adjustment and conversion device has a relatively complex structure, resulting in high on-site manufacturing costs. Furthermore, the application only provides a general description without detailing its specific design. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a tool that simplifies and improves the alignment of submerged sprues in multi-section mixed casting, so that the alignment of submerged sprues can be completed more quickly and safely in multi-section mixed casting production, thereby protecting the casting process and improving production efficiency and product quality.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a tool for simplifying and improving the centering of multi-section mixed casting immersion nozzles is provided, including a bottom shell of the intermediate liner and a crystallizer below the bottom shell of the intermediate liner. The bottom shell of the intermediate liner is provided with multiple through holes of different specifications corresponding to multi-section casting. The through holes are provided with nozzle seat bricks. The tool also includes a centering platform and multiple detachable base plates placed on the centering platform.

[0007] The centering platform is equipped with scales on both sides, and the base plate has through holes. The position of the through holes is adjusted according to the casting center line of the corresponding casting section specification and is positioned by the scales.

[0008] The bottom shell of the intermediate package is provided with a bottom plate slot for accommodating the bottom plate. Below the bottom plate slot is a sprue seat brick, and the brick seat opening of the sprue seat brick is coaxially aligned with the through hole of the bottom plate.

[0009] Furthermore, in the aforementioned simplified and improved multi-section mixed-cast immersion nozzle centering tool, a refractory mortar filling gap is provided between the nozzle seat brick and the base plate.

[0010] Furthermore, in the aforementioned simplified and improved multi-section mixed-cast immersion nozzle centering tool, a refractory mortar filling gap is provided between the base plate and the base plate slot.

[0011] Furthermore, in the aforementioned tool for simplifying and improving the alignment of multi-section mixed-cast immersion nozzles, the base plate is made of high-temperature resistant alloy steel.

[0012] Furthermore, in the aforementioned simplified and improved multi-section mixed-cast immersion nozzle alignment tool, the base plate surface is coated with an anti-oxidation coating.

[0013] Furthermore, in the aforementioned simplified and improved tool for aligning multi-section mixed-cast immersion nozzles, the base plate is elliptical.

[0014] Furthermore, in the aforementioned simplified and improved tool for aligning multi-section mixed-cast immersion nozzles, the scale on the ruler is formed by laser engraving with an accuracy of ±0.1mm.

[0015] Furthermore, in the aforementioned simplified and improved tool for aligning multi-section mixed-cast immersion nozzles, the edge of the through hole in the base plate is provided with a wear-resistant layer.

[0016] Furthermore, in the aforementioned simplified and improved tool for aligning multi-section mixed-cast immersion nozzles, the wear-resistant layer is a wear-resistant ceramic ring.

[0017] Furthermore, in the aforementioned simplified and improved tool for centering multi-section mixed-cast immersion nozzles, the centering platform is provided with three base plates with different bottom plate through-hole positions.

[0018] The beneficial effects of this utility model are as follows: This utility model simplifies and improves the alignment of multi-section mixed-casting submerged entry nozzles, and is suitable for continuous casting operations in steel plants. This tool is simple to manufacture and easy to use. By pre-designing and manufacturing a base plate assembly, the centers of multiple base plate through holes coincide with the casting centerline of the multi-section mixed-casting process, simplifying the alignment work of multiple sections into the alignment work of a single nozzle. This greatly reduces the difficulty of alignment and avoids the asymmetry of the molten steel flow field, uneven temperature field distribution, and uneven solidified billet shell thickness caused by misalignment of the submerged entry nozzle due to different sections. This increases the risk of steel leakage and slag entrapment, and affects surface quality, significantly improving the production safety factor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the relevant structure of the centering platform of a simplified tool for centering multi-section mixed-cast immersion nozzles, as described in Embodiment 1 of this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of a simplified tool for improving the centering of multi-section mixed-casting immersion nozzles, as described in Embodiment 1 of this utility model.

[0021] Figure 3 This is a schematic diagram of the base plate of a centering platform for a simplified tool for centering multi-section mixed-cast immersion nozzles, as described in Embodiment 1 of this utility model.

[0022] Label Explanation:

[0023] 1. Centering platform; 2. First base plate; 3. First through hole; 4. Second base plate; 5. Second through hole; 6. Third base plate; 7. Third through hole; 8. First scale; 9. Second scale;

[0024] 10. Bottom shell of the tundish; 11. Bottom plate slot; 12. Bottom plate; 13. Sprue seat brick; 14. Crystallizer; 15. Casting center line. Detailed Implementation

[0025] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0026] This utility model provides a tool for simplifying and improving the centering of multi-section mixed casting immersion nozzles, including a bottom shell of the tundish and a crystallizer below the bottom shell of the tundish. The bottom shell of the tundish is provided with multiple through holes of different specifications corresponding to multi-section casting. The through holes are provided with nozzle seat bricks. It also includes a centering platform and multiple detachable base plates placed on the centering platform.

[0027] The centering platform is equipped with scales on both sides, and the base plate has through holes. The position of the through holes is adjusted according to the casting center line of the corresponding casting section specification and is positioned by the scales.

[0028] The bottom shell of the intermediate package is provided with a bottom plate slot for accommodating the bottom plate. Below the bottom plate slot is a sprue seat brick, and the brick seat opening of the sprue seat brick is coaxially aligned with the through hole of the bottom plate.

[0029] The position of the bottom plate through hole on the bottom plate coincides with the casting center of the cross section, and is determined as follows: Taking one cross section as the reference cross section, calculate the casting center line of the crystallizer of that cross section, design a reference bottom plate through hole position that coincides with the casting center line of the reference cross section, and the distance between the other bottom plate through holes and the reference bottom plate through hole can be obtained by calculating the difference between the radius of other cross sections and the radius of the reference cross section. Finally, taking the bottom edge of the bottom plate as the inner arc direction, according to the calculation result, a positive number moves in the inner arc direction, and a negative number moves in the outer arc direction. The specific position of the other bottom plate through holes can be measured by the scale at both ends of the centering platform to obtain the bottom plate combination required for each cross section specification.

[0030] Furthermore, in the aforementioned simplified and improved multi-section mixed-cast immersion nozzle centering tool, a refractory mortar filling gap is provided between the nozzle seat brick and the base plate.

[0031] As described above, the above-mentioned design prevents molten steel leakage and enhances high-temperature resistance.

[0032] Furthermore, in the aforementioned simplified and improved multi-section mixed-cast immersion nozzle centering tool, a refractory mortar filling gap is provided between the base plate and the base plate slot.

[0033] As described above, the above-mentioned design prevents molten steel leakage and enhances high-temperature resistance.

[0034] Furthermore, in the aforementioned tool for simplifying and improving the alignment of multi-section mixed-cast immersion nozzles, the base plate is made of high-temperature resistant alloy steel.

[0035] Furthermore, in the aforementioned simplified and improved multi-section mixed-cast immersion nozzle alignment tool, the base plate surface is coated with an anti-oxidation coating.

[0036] Furthermore, in the aforementioned simplified and improved tool for aligning multi-section mixed-cast immersion nozzles, the base plate is elliptical.

[0037] Furthermore, in the aforementioned simplified and improved tool for aligning multi-section mixed-cast immersion nozzles, the scale on the ruler is formed by laser engraving with an accuracy of ±0.1mm.

[0038] As described above, the above settings improve positioning accuracy and reduce human reading errors.

[0039] Furthermore, in the aforementioned simplified and improved tool for aligning multi-section mixed-cast immersion nozzles, the edge of the through hole in the base plate is provided with a wear-resistant layer.

[0040] Furthermore, in the aforementioned simplified and improved tool for aligning multi-section mixed-cast immersion nozzles, the wear-resistant layer is a wear-resistant ceramic ring.

[0041] As described above, the wear-resistant layer reduces erosion and wear from molten steel and maintains the dimensional accuracy of the through holes.

[0042] Furthermore, in the aforementioned simplified and improved tool for centering multi-section mixed-cast immersion nozzles, the centering platform is provided with three base plates with different bottom plate through-hole positions.

[0043] The beneficial effects of this utility model are as follows: This utility model simplifies and improves the alignment of multi-section mixed-casting submersible nozzles, and is suitable for continuous casting operations in steel plants. It has the following beneficial effects:

[0044] 1. This application has enabled the production of φ160-φ600mm round billets with arbitrary multi-section combination and casting, and is also compatible with 190mmX190mm square billets. When facing small-batch, multi-specification orders, it can maximize the capacity advantage of steelmaking-continuous casting, and greatly improve the market adaptability of steel enterprises.

[0045] 2. The continuous casting mechanism proposed in this application reduces frequent casting starts and head and tail scraps, lowers the consumption of refractory materials in the tundish and continuous casting auxiliary materials, and provides a strong boost to steel companies to reduce costs and increase efficiency;

[0046] 3. The tool in this application is simple to manufacture and easy to use. By designing and manufacturing the base plate assembly in advance, the center of the through hole of the base plate assembly coincides with the casting center line of the multi-section mixed casting, which simplifies the centering work of multiple sections into the centering work of one nozzle, greatly reducing the difficulty of centering. It avoids the asymmetry of the molten steel flow field, uneven temperature field distribution and solidified billet shell thickness caused by misalignment of the submerged nozzle due to different sections, which increases the risk of steel leakage and slag entrapment and surface quality defects, and greatly improves the production safety factor.

[0047] Example 1

[0048] Please refer to Figure 1 , Figure 2 and Figure 3 As shown, a tool for simplifying and improving the alignment of multi-section mixed casting immersion nozzles includes a bottom shell 10 of the intermediate liner and a crystallizer 14 below the bottom shell 10. The bottom shell 10 of the intermediate liner is provided with multiple through holes of different specifications corresponding to multi-section casting, and nozzle seat bricks 13 are provided on the through holes.

[0049] The centering tool also includes a centering platform and multiple detachable base plates placed on the centering platform;

[0050] The centering platform is equipped with scales on both sides, and the base plate has through holes. The position of the through holes is adjusted according to the casting center line 15 of the corresponding casting section specification and is positioned by the scales.

[0051] The bottom shell of the intermediate package is provided with a bottom plate slot 11 for accommodating the bottom plate 12. Below the bottom plate slot is a water outlet seat brick, and the brick seat opening of the water outlet seat brick is coaxially aligned with the through hole of the bottom plate.

[0052] The centering tool may specifically include a centering platform 1, a first base plate 2, a first through hole 3, a second base plate 4, a second through hole 5, a third base plate 6, a third through hole 7, a first scale 8, and a second scale 9.

[0053] The above simplifies and improves the use of tools for centering multi-section mixed-cast immersion nozzles: Assuming the casting section combination is φ160, φ180, and φ200, with three-flow production, and the crystallizers aligned in the inner arc direction, using the φ200 specification as the reference section and the first base plate as the reference base plate, the next step is to determine the casting center line of the φ200 crystallizer. Based on this casting center line, the position of the first through hole is designed, the second base plate corresponds to the φ160 specification, and the third base plate corresponds to the φ180 specification. Then, the center distance between the second through hole and the first through hole can be calculated as: (200... -160) / 2=20mm, the center distance between the third through hole and the first through hole is: (200-180) / 2=10mm. Then, place the first base plate, the second base plate, and the third base plate on the centering platform. Using the first and second scales on both sides of the centering platform, with the bottom edge of the centering platform as the inner arc direction, the second through hole is moved down 20mm and the third through hole is moved down 10mm compared to the first through hole. The positions of the second and third through holes can be quickly determined, and the base plate combinations corresponding to φ160, φ180, and φ200 specifications can be obtained. When making the tundish, the designed base plate combination is placed in the base plate slots corresponding to each section. Below the base plate slots is the sprue seat brick. The seat brick opening of the sprue seat brick is aligned with the through hole of the base plate. The gaps around the two are smoothed with refractory mortar. Finally, during production, the prepared tundish is hoisted onto the tundish car, and the tundish car is moved into the casting position. The positions of the through holes of each bottom plate are on the casting center line of the corresponding cross section, realizing the continuous casting of multi-section mixed casting production.

[0054] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A tool for simplifying and improving the alignment of immersion nozzles in multi-section casting, comprising a bottom shell of a tundish and a crystallizer below the bottom shell, wherein the bottom shell of the tundish has multiple through holes of different specifications corresponding to multi-section casting, and nozzle seat bricks are provided on the through holes, characterized in that, It also includes a centering platform and multiple detachable base plates that can be placed on the centering platform; The centering platform is equipped with scales on both sides, and the base plate has through holes. The position of the through holes is adjusted according to the casting center line of the corresponding casting section specification and is positioned by the scales. The bottom shell of the intermediate package is provided with a bottom plate slot for accommodating the bottom plate. Below the bottom plate slot is a sprue seat brick, and the brick seat opening of the sprue seat brick is coaxially aligned with the through hole of the bottom plate.

2. The tool for facilitating improved multi-strand combined continuous casting nozzle alignment of claim 1, wherein, The gap between the water inlet seat brick and the base plate is filled with refractory mortar.

3. The tool for facilitating improved multi-contour submergence nozzle alignment of claim 1, wherein, A refractory mortar filling gap is provided between the base plate and the base plate slot.

4. The tool for facilitating improved multi-strand combined continuous casting nozzle alignment of claim 1, wherein, The base plate is made of high-temperature resistant alloy steel.

5. The tool for facilitating improved multi-strand combined continuous casting nozzle alignment of claim 1, wherein, The base plate surface is coated with an anti-oxidation coating.

6. The tool for facilitating improved multi-contour multiple-strand impeller nozzle alignment of claim 1, wherein, The base plate is elliptical.

7. The tool for facilitating improved multi-contour multiple-strand L-shaped submerged entry nozzle alignment of claim 1, wherein, The graduations on the ruler are formed by laser engraving, with an accuracy of ±0.1mm.

8. The tool for facilitating improved multi-contour multiple-strand L-shaped submerged entry nozzle alignment of claim 1, wherein, The bottom plate has a wear-resistant layer along the edge of the through hole.

9. The tool for facilitating improved multi-contour multiple-strand L-shaped submerged entry nozzle alignment of claim 8, wherein, The wear-resistant layer is a wear-resistant ceramic ring.

10. The tool for facilitating improved multi-contour multiple-strand L-shaped submerged entry nozzle alignment of claim 1, wherein, The centering platform is equipped with three base plates with different through-hole positions.

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