Argon blowing device for impact area of continuous casting tundish

Abstract

The utility model relates to the technical field of continuous casting production processes, in particular to an argon blowing device for an impact area of a continuous casting tundish. According to the argon blowing device, the arc-shaped argon blowing pipe is arranged, the branch blowing pipes are connected to the arc-shaped argon blowing pipe, the arc-shaped argon blowing pipe conveys argon to the branch blowing pipes, the branch blowing pipes spray argon to the impact area of the tundish, and the front ends of the branch blowing pipes are designed to be inclined downwards, so that waste caused by the fact that the argon rushes out of the impact area is avoided; when steel flowers splash, the argon film prevents the molten steel from entraining air and entering the tundish, so that secondary oxidation of the molten steel is avoided, and the quality of cast steel is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of continuous casting production process, in particular to a kind of argon blowing device of continuous casting tundish impact area. BACKGROUND

[0002] With the continuous development of high-quality steel, the purity of steel is also increasingly high, in the continuous casting process, secondary oxidation is one of the important factors affecting the purity of steel, at present, most of the steel production enterprises carry out argon blowing protection to T-shaped tundish, but the impact area of tundish is not protected, when injecting molten steel into the impact area, molten steel splashing will cause molten steel exposed to air, at this time, air will be entrained into molten steel, causing secondary oxidation of molten steel, affecting the quality of cast steel. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at solving the above-mentioned problem, and provides a molten steel protection structure for tundish impact area.

[0004] The utility model solves the problem, and the technical scheme adopted is:

[0005] An argon blowing device for tundish impact area of continuous casting, comprising an arc-shaped argon blowing pipe, an argon gas conveying pipeline is connected to the arc-shaped argon blowing pipe, the arc-shaped argon blowing pipe is arranged on the cover above the tundish impact area, and the inner arc side of the arc-shaped argon blowing pipe is connected to a plurality of branch blowing pipes in the radial direction, the front part of each branch blowing pipe extends to the inner side of the edge of the cover above the tundish impact area, and each branch blowing pipe forms a preset angle with the top surface of the cover.

[0006] Compared with the prior art, the utility model has the beneficial effects that:

[0007] The argon blowing device of the utility model is provided with an arc-shaped argon blowing pipe, and a branch blowing pipe is connected to the arc-shaped argon blowing pipe, the arc-shaped argon blowing pipe supplies argon gas to each branch blowing pipe, and the argon gas is sprayed into the tundish impact area through the branch blowing pipe, the front end of the branch blowing pipe is designed to be inclined downward, so as to avoid waste caused by the argon gas rushing out of the impact area, the argon gas covers the surface of the molten steel in the impact area of the tundish, and an argon gas film is formed, when molten steel splashes, the argon gas film avoids air entering the tundish with the molten steel, so as to avoid secondary oxidation of the molten steel and improve the quality of cast steel.

[0008] As a preferred embodiment, the further technical scheme of the utility model is:

[0009] The horizontal projection of each branch blowing pipe coincides with the radial direction of the arc-shaped argon blowing pipe, and the vertical projection of each branch blowing pipe forms an angle of 13-18° with the top surface of the cover.

[0010] The front part of each sub-lance abuts against the tundish cover edge above the tundish impact area. Through the above structure, the front end outlet of each sub-lance is located inside the tundish cover edge above the tundish impact area, so that the argon can be sprayed into the tundish impact area, and the device can be fixed more firmly.

[0011] The front end of the sub-lance is provided with a flat mouth nozzle, and each flat mouth nozzle is located inside the tundish cover edge above the tundish impact area. The argon flow sprayed by the flat mouth nozzle is in the shape of a fan, which can quickly cover the impact area and has a wider spraying area.

[0012] The fixed steel bar is fixed on the top of the tundish cover above the tundish impact area, and the three-legged stand is fixed on the lower part of the arc-shaped argon blowing pipe. The three-legged stand is erected on the fixed steel bar. The fixed steel bar and the three-legged stand fix the arc-shaped argon blowing pipe, so that the structure of the arc-shaped argon blowing pipe is more stable and convenient to disassemble.

[0013] The argon conveying pipeline comprises a corrugated hose and an L-shaped elbow. One end of the corrugated hose is connected with one end of the L-shaped elbow, and the other end of the L-shaped elbow is connected with the arc-shaped argon blowing pipe. The L-shaped elbow slows down the flow rate of the argon flowing into the arc-shaped argon blowing pipe, so that the argon is evenly sprayed from each sub-lance, avoiding that the argon impact force is too high to blow away the covering agent at the lower part of the tundish impact area, resulting in exposure of the molten steel.

[0014] The arc-shaped argon blowing pipe connected with the L-shaped elbow is fixedly sleeved with a reinforcing sleeve. The reinforcing sleeve increases the strength of the arc-shaped argon blowing pipe. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic view of the argon blowing device of the present application applied to an arc-shaped edge cover;

[0016] Figure 2 is a schematic view of the argon blowing device of the present application applied to a trapezoidal edge cover;

[0017] Figure 3 is a structural perspective view of the argon blowing device of the present application;

[0018] Figure 4 is a front view of the argon blowing device of the present application;

[0019] Figure 5 is a schematic view of the argon blowing device of the present application in use.

[0020] In the figure: 1, tundish; 11, impact area; 12, cover; 2, arc-shaped argon blowing pipe; 21, sub-lance; 22, flat mouth nozzle; 23, reinforcing sleeve; 24, three-legged stand; 3, fixed steel bar; 4, L-shaped elbow; 5, double-hole joint; 6, corrugated hose. DETAILED DESCRIPTION

[0021] The utility model makes further illustration in combination with the embodiment, the purpose is only in better understanding the utility model content, therefore, the example does not limit the protection scope of the utility model.

[0022] Referring to Figures 1-5 The application embodiment one discloses a kind of argon blowing devices of continuous casting tundish impact area, including arc argon blowing pipe 2, eight sub-blowing pipes 21, reinforcing sleeve 23, L-shaped bend pipe 4 and corrugated hose 6, corrugated hose 6 uses stainless steel material, rear end of corrugated hose 6 is communicated nitrogen pipeline, front end of corrugated hose 6 is connected double-hole joint 5 lower end interface, double-hole joint 5 upper end interface connects the rear end of L-shaped bend pipe 4, the front end of L-shaped bend pipe 4 is connected with the intermediate position of arc argon blowing pipe 2 and is welded to communicate fixedly, and the intermediate position of arc argon blowing pipe 2 is fixedly sleeved with reinforcing sleeve 23, and the strength of the intermediate position of arc argon blowing pipe 2 is increased by reinforcing sleeve 23;Specifically, the inner diameter of corrugated hose 6 is 25mm, the total arc length of arc argon blowing pipe 2 is 2900mm, the distance of arc argon blowing pipe 2 two ends horizontal line is 1900 millimeters, the center point distance of arc argon blowing pipe 2 center point from two end line is 800mm, the length of reinforcing sleeve 23 is set as 200mm, and it is located between the two sub-flow pipes in the middle;Arc argon blowing pipe 2 is arranged on the cover 12 above tundish 1 impact area 11, eight sub-blowing pipes 21 are divided into two groups, and are fixedly connected on the two sides of inner arc side of arc argon blowing pipe 2 respectively, and each group of sub-blowing pipes 21 is equidistantly arranged;The front part of each sub-blowing pipe 21 is abutted on the arc edge or trapezoidal edge of cover 12 above tundish 1 impact area 11, the front end outlet of each sub-blowing pipe 21 extends to the inside of cover 12 edge above tundish 1 impact area 11, and each sub-blowing pipe 21 and the top surface of cover 12 are at a preset angle;L-shaped bend pipe 4 slows down the flow rate of argon gas flowing into arc argon blowing pipe 2, so that argon gas is evenly sprayed from each sub-blowing pipe 21, to avoid that argon gas impact force is too high to blow off covering agent in the lower part of tundish 1 impact area 11, resulting in molten steel exposure.

[0023] In the embodiment, the front end of sub-blowing pipe 21 is fixed with flat mouth nozzle 22, and each flat mouth nozzle 22 is located inside the edge of cover 12 above tundish 1 impact area 11. Preferably, the outlet of flat mouth nozzle 22 is oval, the length of long axis is 20mm, the length of short axis is 10mm, the arc length distance between two adjacent flat mouth nozzles 22 is 360mm, through water simulation experiment, under 1.5Mpa pressure, valve is fully opened, when flat mouth nozzle 22 interval is 360mm, it is observed that the fan area formed by water mist has no obvious overlapping area, and the junction of two adjacent fans just contacts, so as to quickly cover impact area 11;The shape of argon gas flow sprayed by flat mouth nozzle 22 is fan-shaped, which can quickly cover impact area 11, and the spraying area is wider.

[0024] The argon blowing device of the embodiment further comprises a fixed steel bar 3 fixed on the top of the tundish cover 12 above the impact area 11 of the tundish 1, and a tripod 24 is fixed on the middle position and the lower part of both ends of the arc-shaped argon blowing pipe 2, the tripod 24 in the middle position is arranged on the fixed steel bar 3, and the tripods 24 at both ends are placed on the top of the tundish cover 12 above the impact area 11 of the tundish 1. Preferably, the fixed steel bar 3 is 1200 mm long, 40 mm high and 50 mm wide, the minimum distance between the fixed steel bar 3 and the edge of the tundish cover 12 of the impact area 11 is 350 mm, and the height of the tripod 24 is 40 mm. The arc-shaped argon blowing pipe 2 is arranged on the tundish cover 12, and the embedded mode in the tundish cover 12 of the impact area 11 is not adopted, because the built-in mode has great limitations, and when an emergency occurs, the device cannot be removed in time, causing damage to the argon blowing device and reducing the maintenance and manufacturing costs.

[0025] In use, the corrugated hose 6 is connected with the quick connector on the nitrogen pipeline extending from the ladle platform, the corrugated hose 6 and the L-shaped elbow 4 are connected, the L-shaped elbow 4 and the arc-shaped argon blowing pipe 2 are welded in communication, the connected arc-shaped argon blowing pipe 2 is placed on the fixed steel bar 3, the tripod 24 in the middle of the arc-shaped argon blowing pipe 2 is clamped on the fixed steel bar 3, and the lower part of the outlet of the flat nozzle 22 is just circumscribed with the arc-shaped edge or the trapezoidal edge of the tundish cover 12 of the impact area 11 of the tundish 1. After being placed, the valve of the argon pipeline on the ladle platform is opened, argon passes through the corrugated hose 6, the double-hole connector 5 and the L-shaped elbow 4 into the arc-shaped argon blowing pipe 2, and is branched to each branch blowing pipe 21 through the arc-shaped argon blowing pipe 2, and is blown into the impact area 11 of the tundish 1 by the eight flat nozzles 22, so as to form an argon protection layer on the surface of the molten steel, isolate air and prevent secondary oxidation of the molten steel.

[0026] The argon blowing device of the embodiment further comprises a fixed steel bar 3 fixed on the top of the tundish cover 12 above the impact area 11 of the tundish 1, and a tripod 24 is fixed on the middle position and the lower part of both ends of the arc-shaped argon blowing pipe 2, the tripod 24 in the middle position is arranged on the fixed steel bar 3, and the tripods 24 at both ends are placed on the top of the tundish cover 12 above the impact area 11 of the tundish 1. Preferably, the fixed steel bar 3 is 1200 mm long, 40 mm high and 50 mm wide, the minimum distance between the fixed steel bar 3 and the edge of the tundish cover 12 of the impact area 11 is 350 mm, and the height of the tripod 24 is 40 mm. The arc-shaped argon blowing pipe 2 is arranged on the tundish cover 12, and the embedded mode in the tundish cover 12 of the impact area 11 is not adopted, because the built-in mode has great limitations, and when an emergency occurs, the device cannot be removed in time, causing damage to the argon blowing device and reducing the maintenance and manufacturing costs.

[0027] Preferably, the embodiment one is applicable to the fixed cover 12 with the thickness of 150mm-240mm, the vertical projection of each sub-blowing pipe 21 is 13-18° with the top surface of the cover 12, the angle of the vertical projection of each sub-blowing pipe 21 with the top surface of the cover 12 is adjusted according to the thickness of the cover 12, the horizontal projection of each sub-blowing pipe 21 is coincided with the radial direction of the arc-shaped argon blowing pipe 2; when the device is fixed on the cover 12 with the thickness of 150mm, the angle of the vertical projection of the sub-blowing pipe 21 with the top surface of the cover 12 is adjusted to 13°, at this time, the argon gas flow sprayed by each sub-blowing pipe 21 will not rush out of the upper edge of the impact area 11, and the argon gas can naturally fall to the surface of the molten steel in the impact area 11 to form an argon gas film, at the same time, the covering agent on the surface of the molten steel will not be impacted by a large force to avoid the covering agent being blown away to cause the exposure of the molten steel; when the device is fixed on the cover 12 with the thickness of 240mm, the angle of the vertical projection of the sub-blowing pipe 21 with the top surface of the cover 12 is adjusted to 18°, at the same time, the argon gas flow sprayed by each sub-blowing pipe 21 will not rush out of the upper edge of the impact area 11, and the covering agent on the surface of the molten steel will not be impacted by a large force.

[0028] The embodiment two discloses a kind of argon blowing devices of continuous casting tundish 1 impact area 11, which is different from the embodiment one, the vertical projection of each sub-blowing pipe 21 is 15° with the top surface of the cover 12, when the device is fixed on the cover 12 with the thickness of 200mm-210mm, at this time, the top surface of the cover 12 is 15° with the angle of each sub-blowing pipe 21 as the best argon blowing angle, greater than 15°, argon gas covering area reduces, argon gas impact strength is large, will blow open the covering agent on the surface of the molten steel, cause the exposure of the molten steel;When less than 15°, the trajectory of argon gas spraying will rush out of the impact area 11 of the tundish 1, causing argon gas waste, and the utilization rate of argon gas is low;Argon gas flow jet trajectory falls directly into the impact area 11 downwards, even if part of argon gas collides with the ladle long water hole, but also falls into the impact area 11 due to the angle downwards, will not blow out of the impact area 11, so as to improve the utilization rate of argon gas and avoid waste.

[0029] The above only describes the preferred and feasible embodiment of the present application, and does not limit the scope of the present application, and any equivalent changes made by using the content of the present application and its drawings are included in the scope of the present application.

Claims

1. An argon blowing device for the impact zone of a continuous casting tundish, characterized in that: It includes an arc-shaped argon blowing tube, which is connected to an argon gas delivery pipe. The arc-shaped argon blowing tube is set on the cover above the impact zone of the intermediate package, and multiple branch blowing tubes are radially connected to the inner arc side of the arc-shaped argon blowing tube. The front part of each branch blowing tube extends to the inner side of the edge of the cover above the impact zone of the intermediate package, and each branch blowing tube is at a preset angle to the top surface of the cover.

2. The argon blowing device for the impact zone of the continuous casting tundish according to claim 1, characterized in that: The horizontal projection of each blowpipe coincides with the radial projection of the arc-shaped argon blowing pipe, and the vertical projection of each blowpipe forms an angle of 13-18° with the top surface of the cover.

3. The argon blowing device for the impact zone of the continuous casting tundish according to claim 1, characterized in that: The front part of each blowpipe abuts against the edge of the cover above the intermediate pack impact zone.

4. The argon blowing device for the impact zone of the continuous casting tundish according to claim 1, characterized in that: The front end of the blowpipe is equipped with a flat nozzle, and each flat nozzle is located inside the edge of the pack cover above the impact zone of the intermediate pack.

5. The argon blowing device for the impact zone of the continuous casting tundish according to claim 1, characterized in that: It also includes a fixing steel bar, which is fixed to the top of the bag cover above the impact zone of the intermediate bag, and a tripod is fixed to the lower part of the arc-shaped argon blowing pipe, which is supported on the fixing steel bar.

6. The argon blowing device for the impact zone of the continuous casting tundish according to claim 1, characterized in that: The argon delivery pipeline includes a corrugated hose and an L-shaped bend. One end of the corrugated hose is connected to one end of the L-shaped bend, and the other end of the L-shaped bend is connected to an arc-shaped argon blowing pipe.

7. The argon blowing device for the impact zone of the continuous casting tundish according to claim 6, characterized in that: A reinforcing sleeve is fixedly fitted onto the arc-shaped argon blowing tube connected to the L-shaped bend.

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