Construction method for prolonging service life of external corner of T-shaped tundish

Abstract

The invention provides a construction method for prolonging the service life of an external corner of a T-shaped tundish, which comprises the following steps of: S100, marking lines in the T-shaped tundish according to drawing requirements so as to determine fixing points of a plurality of anchoring parts, and fixing the anchoring parts on the fixing points; s200, a pouring mold is placed in the T-shaped tundish, and the distance between the pouring mold and the peripheral side walls and the distance between the pouring mold and the bottom wall of the T-shaped tundish are adjusted and fixed; s300, refractory castable is poured along a gap between the pouring mold and the peripheral side wall in the T-shaped tundish, so that the anchoring part is fully wrapped by the refractory castable to form a lining; and S400, after pouring of the lining is completed, the pouring mold is detached, and the lining obtained after pouring of the T-shaped tundish is completed is naturally dried. The lining is integrally formed in a pouring mode, the repair amount and refractory material consumption of the external corner of the tundish are reduced, the service life of the external corner can be effectively prolonged, the cost is reduced, and the operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of continuous casting production in steelmaking, and in particular to a construction method for extending the service life of the external corner of a T-shaped tundish. Background Technology

[0002] The T-type tundish is a crucial component in the continuous casting process of steelmaking. Located between the ladle and the crystallizer, it receives molten steel flowing from the ladle and distributes it to the lower crystallizer for casting into continuously cast steel billets. The T-type tundish serves several functions: reducing the static pressure of the molten steel, maintaining a stable molten steel level, and ensuring a smooth injection of molten steel into the crystallizer; promoting the upward flotation of inclusions in the molten steel to purify it; in multi-strand continuous casting machines, distributing molten steel to each crystallizer via the tundish; and storing molten steel.

[0003] In existing technologies, the refractory material at the external corner of the T-shaped tundish protrudes, and this corner is close to the molten steel pouring area, making it one of the most turbulent parts of the molten steel flow. During use, the refractory material at the external corner is subject to erosion and scouring, making it extremely easy to be damaged. When dismantling the cold steel inside the tundish, the cold steel can easily jam the protruding refractory material, requiring multiple dismantling processes, which can also cause the refractory material at the external corner to peel off.

[0004] Furthermore, a Chinese utility model patent with authorization announcement number "CN212443231U" and titled "Corner Refractory Material and T-shaped Intermediate Crate" specifically discloses a corner refractory material and a T-shaped intermediate cladding. The corner refractory material is used to wrap corners, and is formed by at least one of prefabrication, casting, or brickwork. The corner refractory material has an L-shaped cross-section, including a first wrapping part and a second wrapping part. The first wrapping part is attached to and fixed to the inner wall of the impact zone, and the second wrapping part is attached to and fixed to the inner wall of the molten pool. The bottom of the corner refractory material is attached to the bottom wall of the T-shaped intermediate cladding and extends outward toward the corner of the L-shape to form a boss. The outer top edge of the boss adopts a sloping transition. The corners constructed by brickwork or prefabrication blocks in this patent have poor integrity and are easily damaged under external force and stress, increasing production costs. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a construction method for extending the life of the external corner of a T-shaped intermediate package.

[0006] This invention proposes a construction method for extending the lifespan of the external corner of a T-shaped intermediate package, comprising the following steps:

[0007] S100. Draw lines inside the T-shaped intermediate baffle according to the drawing requirements to determine the fixing points of multiple anchors, and fix each anchor to the fixing point.

[0008] S200. Place the casting mold inside the T-shaped tundish, adjust and fix the distance between the casting mold and the four side walls and bottom wall of the T-shaped tundish;

[0009] S300. Refractory castable is poured into the gap between the casting mold and the four sides of the T-shaped tundish, so that the refractory castable fully wraps the anchor to form an inner lining;

[0010] S400. After the inner lining is poured, the pouring mold is removed, and the inner lining of the T-shaped intermediate ladle is allowed to dry naturally.

[0011] Preferably, each of the anchors is evenly distributed in a linear array on the four side walls and bottom wall of the T-shaped intermediate tundish.

[0012] Preferably, the anchor is Y-shaped.

[0013] Preferably, the anchors on the four sides and bottom wall of the T-shaped intermediate liner are arranged vertically and staggered in the same row; the anchors on the same column are arranged vertically and staggered or parallel.

[0014] Preferably, the spacing between adjacent anchors is 300mm to 400mm.

[0015] Preferably, the natural drying time of the lining after the T-shaped tundish casting is completed is 36h to 48h.

[0016] As described above, the construction method for extending the lifespan of the external corner of a T-shaped intermediate package, as disclosed in this invention, has the following beneficial effects:

[0017] This invention involves arranging multiple anchors on the four side walls and bottom wall of a T-shaped tundish. A casting mold is placed inside the T-shaped tundish using a hoisting device, and the distance between the casting mold and the four side walls and bottom wall is adjusted. After adjustment, the casting mold is fixed inside the T-shaped tundish. Then, refractory castable is poured into the gap formed between the casting mold and the four side walls of the T-shaped tundish, ensuring the refractory castable fully encapsulates the anchors to form a lining. Finally, the casting mold is disassembled, and the lining formed inside the T-shaped tundish is allowed to dry naturally. This invention uses a casting method to integrally form the lining, reducing the amount of repair work on the tundish corners and refractory consumption, effectively increasing the service life of the corners, reducing costs, and improving operational efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic flowchart of a construction method for extending the lifespan of the external corner of a T-shaped intermediate package, provided in an embodiment of the present invention.

[0019] Figure 2This is a schematic diagram of the structure of an anchor provided in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram illustrating the overall installation effect of an anchor provided in an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the assembly of a casting mold provided in an embodiment of the present invention.

[0022] Figure 5 This is a three-dimensional assembly diagram of a casting mold provided in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100, T-shaped tundish; 200, anchor; 300, casting mold; 400, first injection section; 500, second injection section; 600, third injection section. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0026] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0027] like Figure 1 As shown, an embodiment of a construction method for extending the lifespan of a T-shaped intermediate corner includes the following steps:

[0028] S100. Draw lines inside the T-shaped intermediate package 100 according to the drawing requirements to determine the fixing points of multiple anchors 200, and fix each anchor 200 to the fixing point.

[0029] Specifically, according to the drawing requirements, lines are drawn on the four side walls and bottom wall of the T-shaped tundish 100. This includes reserving a 2000mm long space based on the longitudinal center line of the third injection section 600, and drawing lines on the bottom and side walls of this space to determine the fixing points of the anchors 200. Each anchor 200 is then welded to the fixing point.

[0030] S200. Place the casting mold 300 inside the T-shaped tundish 100, adjust and fix the distance between the casting mold 300 and the four side walls and bottom wall inside the T-shaped tundish 100.

[0031] Specifically, before hoisting the casting mold 300, the sprue molds are welded onto the casting mold 300, and the casting mold 300 is hoisted into the T-shaped tundish 100 using hoisting equipment. Then, the position of the casting mold 300 is adjusted using the hoisting equipment so that the distance between the four sides of the casting mold 300 and the four sides of the T-shaped tundish 100, and between the bottom of the casting mold 300 and the bottom wall of the T-shaped tundish 100, meets predetermined requirements. It should be noted that those skilled in the art can determine the appropriate spacing based on actual working conditions. After the spacing is adjusted, the two sprue molds at the bottom of the casting mold 300 correspond to the first injection section 400 and the third injection section 500, respectively. The two sprue molds are then connected and fixed to the first injection section 400 and the third injection section 500 using bolts, thus securing the casting mold 300 inside the T-shaped tundish 100. Finally, the casting mold 300 and the T-shaped tundish 100 are fixed together with connecting bolts to prevent the mold from moving during the feeding process.

[0032] S300: Pour refractory castable into the gap between the casting mold 300 and the four sides of the T-shaped tundish 100, so that the refractory castable fully wraps the anchor 200 to form an inner lining.

[0033] Specifically, refractory castable is poured into the gap between the casting mold 300 and the four sides of the T-shaped tundish 100. Then, the poured refractory castable is cured to ensure it fully encapsulates the anchor 200, forming a seamless inner lining, which effectively improves the overall strength of the lining. Magnesium-based refractory castable is preferred, as it effectively extends the service life of the external corner. It should be noted that if the refractory castable melts during use, the slag at the melted area can be cleaned with cold steel before re-pouring or the lining can be removed and re-pouring can be performed.

[0034] After the S400 and inner lining are poured, the pouring mold 300 is removed, and the inner lining poured by the T-shaped intermediate ladle 100 is allowed to dry naturally.

[0035] Specifically, the connecting bolts between the casting mold 300 and the T-shaped tundish 100 are removed. The casting mold 300 is then lifted using a jack. Two steel wire ropes of equal length are threaded under the crossbeam of the casting mold 300 inside the T-shaped tundish 100. A crane is used to lift the casting mold 300 from inside the T-shaped tundish 100. The connecting bolts between the sprue mold and the T-shaped tundish are removed, and the refractory material at the argon blowing nozzle is cleaned. After the T-shaped tundish has been filled, it is placed on the tundish tilting platform using hoisting equipment. The sprue mold is then ejected and allowed to dry naturally, resulting in the final lining of the T-shaped tundish. This lining is arranged along the T-shaped tundish, providing high integrity and effectively reducing the amount of repair required at the corners of the T-shaped tundish, thereby increasing the service life of the corners.

[0036] In one embodiment, each anchor 200 is evenly distributed in a linear array on the four side walls and bottom wall of the T-shaped intermediate liner 100.

[0037] Specifically, the anchors 200 are welded in a linear array to the four side walls and bottom wall of the T-shaped tundish 100, with the same spacing between adjacent anchors 200. It should be noted that the number of rows and columns of the linear array formed by the anchors 200 on each inner wall of the T-shaped tundish can be determined by those skilled in the art based on specific working conditions.

[0038] In one embodiment, the anchor 200 is Y-shaped, which allows the anchor to withstand vertical tensile force while resisting horizontal shear force, ensuring the stability of the lining after casting.

[0039] In one embodiment, the anchors 200 located in the same row and adjacent on the four sides and bottom wall of the T-shaped intermediate ballast 100 are arranged in a vertically staggered manner; the anchors 200 located in the same column and adjacent are arranged in a vertically staggered or parallel manner.

[0040] Specifically, after the refractory castable is poured into and fully encapsulates the staggered anchors 200, the strength of the lining can be effectively improved after the refractory castable has solidified.

[0041] In one embodiment, the spacing between adjacent anchors 200 is preferably 300mm to 400mm, so that the strength of the lining is effectively guaranteed after the refractory castable solidifies.

[0042] In one embodiment, the natural drying time of the lining after the T-shaped tundish 100 is completed is 36h to 48h.

[0043] Specifically, if the casting season for the refractory castable is summer, the natural drying time for the T-shaped tundish after demolding is preferably 36 hours; if the casting season for the refractory castable is winter, the natural drying time for the T-shaped tundish after demolding is preferably 48 hours, so as to ensure that the lining is fully dried after casting and thus ensure the strength of the lining.

[0044] In summary, this invention involves arranging multiple anchors on the four side walls and bottom wall of a T-shaped tundish, placing the casting mold inside the T-shaped tundish using a hoisting device, and adjusting the distance between the casting mold and the four side walls and bottom wall of the T-shaped tundish. After adjustment, the casting mold is fixed inside the T-shaped tundish. Then, refractory castable is poured into the gap formed between the casting mold and the four side walls of the T-shaped tundish, allowing the refractory castable to fully encapsulate the anchors and form an inner lining. Finally, the casting mold is disassembled, and the inner lining formed inside the T-shaped tundish is allowed to dry naturally. This invention uses a casting method to integrally form the inner lining, reducing the amount of repair required for the tundish's external corners and refractory consumption, effectively improving the service life of the external corners, reducing costs, and increasing operational efficiency.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A construction method for extending the lifespan of the external corner of a T-shaped intermediate package, characterized in that, Includes the following steps: S100. Draw lines inside the T-shaped intermediate liner (100) according to the drawing requirements to determine the fixing points of multiple anchors (200), and fix each of the anchors (200) to the fixing points. S200. Place the casting mold (300) inside the T-shaped tundish (100), adjust and fix the distance between the casting mold (300) and the four side walls and bottom wall inside the T-shaped tundish (100); S300, pour refractory castable into the gap between the casting mold (300) and the four sides of the T-shaped tundish (100) so that the refractory castable fully wraps the anchor (200) to form an inner lining; S400. After the inner lining is poured, the pouring mold (300) is removed, and the inner lining of the T-shaped intermediate ladle (100) is allowed to dry naturally.

2. The construction method for extending the lifespan of the external corner of a T-shaped intermediate package according to claim 1, characterized in that, Each of the anchors (200) is evenly distributed in a linear array on the four sides and bottom wall of the T-shaped intermediate tundish (100).

3. The construction method for extending the lifespan of the external corner of a T-shaped intermediate package according to claim 2, characterized in that, The anchor (200) is Y-shaped.

4. The construction method for extending the lifespan of the external corner of a T-shaped intermediate package according to claim 3, characterized in that, The anchors (200) on the four sides and bottom walls of the T-shaped intermediate liner (100) are arranged vertically and staggered on the same row; the anchors (200) on the same column are arranged vertically and staggered or parallel.

5. The construction method for extending the lifespan of the external corner of a T-shaped intermediate package according to claim 2, characterized in that, The spacing between adjacent anchors (200) is 300mm to 400mm.

6. The construction method for extending the lifespan of the external corner of a T-shaped intermediate package according to claim 1, characterized in that, The natural drying time of the inner lining after the T-shaped intermediate ladle (100) is completed is 36h to 48h.

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