Quick-change sizing submerged combined nozzle

Abstract

A sliding plate outer sleeve is of a rectangular step-shaped sliding plate structure, and a cone frustum through hole is formed in the middle of the sliding plate outer sleeve. The sizing nozzle is embedded in a cone frustum through hole of the sliding plate outer sleeve, the lower end face of the sliding plate outer sleeve is connected with the upper end face of the submersed nozzle, the submersed nozzle is of a long cylindrical structure with a hollow channel, the steel shell wraps the sliding plate outer sleeve and the outer surface of the upper portion of the submersed nozzle, and the sizing nozzle and the submersed nozzle are combined and connected into a whole. The integral quick-change sizing submerged combined nozzle is formed; according to the structure, the sizing nozzle and the submersed nozzle are combined into a whole, so that secondary operation of mounting the externally mounted submersed nozzle during quick replacement of the nozzle is avoided, the sealing problem of the joint of the sizing nozzle and the submersed nozzle is solved, the nozzle replacement operation efficiency is effectively improved, the labor amount of workers is reduced, and the operation safety risk and hidden danger are reduced; the constant-diameter nozzle and the submersed nozzle can be quickly replaced without interruption under the condition of protecting the pouring operation, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical continuous casting, and particularly relates to a quick-change sizing submerged combined nozzle. Background Art

[0002] Continuous casting of steel is the main process in current steel production. Generally, molten steel is converted into steel billets through continuous casting. Protective casting refers to an important technical measure to protect the molten steel exposed to the air during the continuous casting process of steel, avoiding secondary oxidation of the molten steel by air. The application of protective casting technology is one of the signs of the increasingly perfect development of continuous casting technology. During the protective casting process of small billet continuous casting, the sizing nozzle controls the flow rate of molten steel, and the externally installed submerged nozzle protects the molten steel. The uniform and stable flow of molten steel through the sizing nozzle and the externally installed submerged nozzle into the mold is a necessary condition to ensure the normal progress of continuous casting.

[0003] Currently, the protective casting of small billet continuous casting mainly adopts the cooperation mode of externally installing a submerged nozzle on the lower part of a quick-change sizing nozzle. The quick-change sizing nozzle has a slide plate cooperation structure, which can realize the replacement of the sizing nozzle without interrupting the continuous casting operation, so that the tundish life is not limited by the condition of the sizing nozzle. The sizing nozzle and the externally installed submerged nozzle can be replaced separately according to the needs of continuous casting. However, the above replacement operation process is cumbersome, with a large amount of manual labor, and the connection between the two needs to be sealed during replacement, which is prone to production accidents such as steel leakage, and there are certain operation safety risks and potential hazards. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model provides a quick-change sizing submerged combined nozzle, which combines the quick-change sizing nozzle and the externally installed submerged nozzle into an integral whole, can integrally realize sizing flow control and protective casting during the small billet continuous casting process, solves the sealing problem at the connection between the two, effectively improves the efficiency of nozzle replacement operation, reduces the labor intensity of workers, and reduces operation safety risks and potential hazards.

[0005] The technical solution adopted by the utility model is as follows: a quick-change sizing submerged combined nozzle, including a slide plate outer sleeve connected to the lower end of the tundish. The slide plate outer sleeve is a rectangular stepped slide plate structure, and a conical frustum through hole is provided in the middle of the slide plate outer sleeve; the sizing nozzle is nested in the conical frustum through hole of the slide plate outer sleeve, the lower end surface of the slide plate outer sleeve is connected to the upper end surface of the submerged nozzle, the submerged nozzle is a long cylindrical structure with a hollow channel, and a steel shell covers the outer surfaces of the slide plate outer sleeve and the upper part of the submerged nozzle, combining and connecting the sizing nozzle and the submerged nozzle into an integral whole to form an overall quick-change sizing submerged combined nozzle.

[0006] The upper part of the slide plate outer sleeve is a cuboid, and the lower part is integrally connected with a conical frustum boss, and the centers of the two coincide.

[0007] The external dimensions of the sizing nozzle are adapted to the dimensions of the conical through-hole of the slide gate outer sleeve, and the sizing nozzle is nested and installed in the conical through-hole of the slide gate outer sleeve by refractory mortar.

[0008] The upper end face of the sizing nozzle is flush with the upper end face of the slide gate outer sleeve, and the lower end face of the sizing nozzle is flush with the lower end face of the slide gate outer sleeve; the height of the sizing nozzle is consistent with the height of the slide gate outer sleeve. The sizing nozzle is a hollow structure, and the upper edge of the inner wall of the sizing nozzle is a bowl-shaped arc-shaped curved surface, and the lower part is a sizing contraction section.

[0009] The upper end face of the submerged nozzle is consistent with the external dimensions of the lower end face of the slide gate outer sleeve. The diameter of the hollow channel on the upper end face of the submerged nozzle is consistent with the diameter of the conical through-hole in the middle of the lower end face of the slide gate outer sleeve. The upper end face of the submerged nozzle and the lower end face of the slide gate outer sleeve are bonded by fire clay.

[0010] The upper part of the submerged nozzle gradually reduces in diameter from top to bottom along its length direction, and the upper part of the hollow channel of the submerged nozzle gradually reduces in diameter from top to bottom.

[0011] The slide gate outer sleeve is made of corundum or aluminum-carbon material, the sizing nozzle is made of zirconia material, and the submerged nozzle is made of aluminum-zirconium-carbon material; the gap between the steel shell and the outer surfaces of the slide gate outer sleeve and the submerged nozzle is filled with refractory mortar.

[0012] The steel shell covers the outer surfaces of the slide gate outer sleeve and the upper part of the submerged nozzle, connecting the sizing nozzle and the submerged nozzle together as a whole to form an integral quick-change sizing submerged combined nozzle; the purpose of this setting is: connecting the sizing nozzle and the submerged nozzle together as an integral quick-change sizing submerged combined nozzle through the steel shell, with significant use effects. During the continuous casting of small billets, sizing flow control and protective casting can be achieved simultaneously in an integrated manner, and the sealing problem at the connection between the two is solved, effectively improving the efficiency of nozzle replacement operation, reducing the labor intensity of workers, and reducing operation safety risks and hazards.

[0013] The slide gate outer sleeve is a rectangular stepped slide gate structure, and a conical through-hole is provided in the middle of the slide gate outer sleeve; the sizing nozzle is nested in the conical through-hole of the slide gate outer sleeve; the purpose of this setting is: the sizing nozzle is nested in the slide gate outer sleeve, and the steel shell covers the outer surfaces of the slide gate outer sleeve and the upper part of the submerged nozzle, which can stabilize the overall structure and is not easy to fall off.

[0014] The upper edge of the inner wall of the sizing nozzle is a bowl-shaped arc-shaped curved surface. The purpose of this setting is: to correct the molten steel flow in the nozzle runner, eliminate the influence of slide gate throttling and flow deviation, eliminate the stagnant flow area, reduce blockage, stabilize the molten steel flow field, facilitate the floating of inclusion particles and bubbles, and improve the quality of continuously cast steel billets.

[0015] Advantages of the present utility model: The quick-change sizing submerged combined nozzle combines the sizing nozzle and the submerged nozzle into an integral whole, avoiding the secondary operation of installing the external submerged nozzle during the quick-change of the nozzle, solving the sealing problem at the connection between the two, effectively improving the efficiency of nozzle replacement operation, reducing the labor intensity of workers, reducing the operation safety risks and hidden dangers, realizing the continuous-flow and quick replacement of the sizing nozzle and the submerged nozzle under the protected casting operation conditions, and improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional sectional structural schematic diagram of the quick-change sizing submerged combined nozzle of the present utility model;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the slide plate outer sleeve of the quick-change sizing submerged combined nozzle of the present utility model.

[0018] Reference numerals in the drawings: 1, slide plate outer sleeve; 2, sizing nozzle; 3, submerged nozzle; 4, steel shell; 5, conical frustum through hole; 6, hollow channel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The following further details the specific embodiments of the present utility model with reference to the accompanying drawings.

[0020] As Figure 1-2 shown, a quick-change sizing submerged combined nozzle includes a slide plate outer sleeve 1 connected to the lower end of the tundish. The slide plate outer sleeve 1 is a rectangular stepped slide plate structure, and a conical frustum through hole 5 is provided in the middle of the slide plate outer sleeve 1; the sizing nozzle 2 is nested in the conical frustum through hole 5 of the slide plate outer sleeve 1. The lower end surface of the slide plate outer sleeve 1 is connected to the upper end surface of the submerged nozzle 3. The submerged nozzle 3 is a long cylindrical structure with a hollow channel 6. A steel shell 4 covers the outer surfaces of the upper parts of the slide plate outer sleeve 1 and the submerged nozzle 3, combining and connecting the sizing nozzle 2 and the submerged nozzle 3 into an integral whole to form an overall quick-change sizing submerged combined nozzle.

[0021] The upper part of the slide plate outer sleeve 1 is a cuboid, and the lower part is integrally connected with a conical boss, and their centers coincide.

[0022] The outer dimension of the sizing nozzle 2 is adapted to the size of the conical frustum through hole 5 of the slide plate outer sleeve 1, and the sizing nozzle 2 is nested and installed in the conical through hole 5 of the slide plate outer sleeve 1 through refractory mortar;

[0023] The upper end surface of the sizing nozzle 2 is flush with the upper end surface of the slide plate outer sleeve 1, and the lower end surface of the sizing nozzle 2 is flush with the lower end surface of the slide plate outer sleeve 1; the height of the sizing nozzle 2 is consistent with the height of the slide plate outer sleeve 1. The sizing nozzle 2 is a hollow structure, and the upper edge of the inner wall of the sizing nozzle 2 is a bowl-shaped circular arc surface, and the lower part is a sizing contraction section.

[0024] The upper end face of the submerged nozzle 3 is consistent with the outer contour dimensions of the lower end face of the slide gate outer sleeve 1. The diameter of the hollow channel 6 on the upper end face of the submerged nozzle 3 is consistent with the diameter of the conical through hole 5 in the middle of the lower end face of the slide gate outer sleeve 1. The upper end face of the submerged nozzle 3 and the lower end face of the slide gate outer sleeve 1 are bonded with fire clay.

[0025] The upper part of the submerged nozzle 3 gradually reduces in diameter from top to bottom along its length direction, and the upper part of the hollow channel 6 of the submerged nozzle 3 gradually reduces in diameter from top to bottom.

[0026] The slide gate outer sleeve 1 is made of corundum or aluminum carbon material, the sizing nozzle 2 is made of zirconia material, and the submerged nozzle 3 is made of aluminum zirconium carbon material;

[0027] The gap between the steel shell 4 and the outer surfaces of the slide gate outer sleeve 1 and the submerged nozzle 3 is filled with refractory mortar to combine the sizing nozzle 2 and the submerged nozzle 3 into a whole. The two are tightly sealed, solving the problem of secondary oxidation of molten steel caused by poor sealing between the two due to the separated structure, realizing the continuous-flow rapid replacement of the sizing nozzle 2 and the submerged nozzle 3 under the condition of protective casting operation, effectively improving the operation efficiency of nozzle replacement, reducing the labor intensity of workers, and reducing the operation safety risks and hidden dangers.

[0028] When the quick-change sizing submerged combined nozzle is in use, the top surface of the slide gate outer sleeve 1 on its upper part needs to be fixed at the nozzle of the tundish. The installation method between the quick-change sizing submerged combined nozzle and the nozzle of the tundish is the prior art and can be selected according to the use requirements, which will not be elaborated here.

[0029] Except for the above embodiments, the present utility model can also have other implementation manners. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present utility model.

Claims

1. A quick-change sizing submerged combined nozzle, characterized in that: It includes a slide plate jacket connected to the lower end of the tundish. The slide plate jacket is a rectangular stepped slide plate structure, and a truncated cone through-hole is provided in the middle of the slide plate jacket. The sizing nozzle is nested in the truncated cone through-hole of the slide plate jacket. The lower end surface of the slide plate jacket is connected to the upper end surface of the submerged nozzle. The submerged nozzle is a long cylindrical structure with a hollow channel. The steel shell covers the outer surfaces of the slide plate jacket and the upper part of the submerged nozzle, combining and connecting the sizing nozzle and the submerged nozzle into one body to form an integral quick-change sizing submerged combined nozzle.

2. The quick-change sizing submerged combined nozzle according to claim 1, characterized in that: The upper part of the slide plate jacket is a cuboid, and the lower part is integrally connected with a conical boss, and their centers coincide.

3. A quick-change sizing submerged combined nozzle according to claim 1, characterized in that: The external dimensions of the sizing nozzle are adapted to the dimensions of the truncated cone through-hole of the slide plate jacket, and the sizing nozzle is nested and installed in the conical through-hole of the slide plate jacket through refractory mortar.

4. A quick-change sizing submerged combined nozzle according to claim 1, characterized in that: The upper end surface of the sizing nozzle is flush with the upper end surface of the slide plate jacket, and the lower end surface of the sizing nozzle is flush with the lower end surface of the slide plate jacket; the height of the sizing nozzle is consistent with the height of the slide plate jacket. The sizing nozzle is a hollow structure. The inner wall upper edge of the sizing nozzle is a bowl-shaped circular arc surface, and the lower part is a sizing contraction section.

5. A quick-change sizing submerged combined nozzle according to claim 1, characterized in that: The upper end surface of the submerged nozzle is the same as the external dimensions of the lower end surface of the slide plate jacket. The diameter of the hollow channel on the upper end surface of the submerged nozzle is the same as the diameter of the truncated cone through-hole in the middle of the lower end surface of the slide plate jacket. The upper end surface of the submerged nozzle and the lower end surface of the slide plate jacket are bonded by fire clay.

6. The quick-change sizing submerged combined nozzle according to claim 1, characterized in that: The upper part of the submerged nozzle gradually reduces in diameter from top to bottom along its length direction, and the upper part of the hollow channel of the submerged nozzle gradually reduces in diameter from top to bottom.

7. A quick-change sizing submerged combined nozzle according to claim 1, characterized in that: The slide plate jacket is made of corundum or aluminum carbon material, the sizing nozzle is made of zirconia material, and the submerged nozzle is made of aluminum zirconium carbon material; the gap between the steel shell and the outer surfaces of the slide plate jacket and the submerged nozzle is filled with refractory mortar.

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