Water gap for tundish, tundish and continuous casting equipment

Abstract

The invention discloses a water gap for a tundish, the tundish and continuous casting equipment, and relates to the technical field of continuous steel casting, the water gap is provided with a steel passing channel, seams and a dispersion area, the steel passing channel penetrates through the water gap, the seams are arranged outside the steel passing channel in a sleeving mode at intervals, and the seams comprise the first seam and the second seam communicating with the axial end of the first seam; the first seam is used for being communicated with an air source, the ring width of the second seam is larger than that of the first seam, and the dispersion area is communicated with the outer circumferential side of the steel passing channel and the inner circumferential side of the second seam. When the flowing speed and the pressure of argon are unstable and the argon enters the second seam from the first seam, the flow fluctuation or the pressure fluctuation of the argon blown out of the dispersion area caused by the pressure fluctuation of the gas source pipeline can be reduced or even eliminated, so that the adverse situation that nodules at the water gap fall off is improved.

Description

Technical Field

[0001] The invention relates to the technical field of continuous steel casting, and in particular to a nozzle for a tundish, a tundish and continuous casting equipment. Background Art

[0002] In continuous steel casting, molten steel is poured into the tundish, which then distributes the molten steel to each crystallizer through the nozzle. The steel passage from the tundish to the crystallizer uses diffused argon technology to prevent air from entering the nozzle.

[0003] However, the argon gas blown into the argon gas gap in the nozzle may have unstable flow velocity or pressure, which will cause the nozzle to fall off and cause a jump point in the liquid level of the crystallizer. This jump point is caused by a sudden increase in the amount of steel passing through the channel, which directly affects the stability, continuity and quality of the casting machine. Summary of the invention

[0004] In order to solve the above problems, the present application provides a nozzle for a tundish, a tundish and a continuous casting device.

[0005] The present application provides a tundish water nozzle, the water nozzle is provided with a steel passing channel, a crack and a dispersion zone, the steel passing channel runs through the water nozzle, the cracks are sleeved outside the steel passing channel at intervals, the cracks include a first crack and a second crack connected to one axial end of the first crack, the first crack is used to connect with a gas source, the annular width of the second crack is greater than the annular width of the first crack, and the dispersion zone is connected to the outer peripheral side of the steel passing channel and the inner peripheral side of the second crack.

[0006] In some embodiments, the water nozzle includes a main body and a bowl connected to one axial end of the main body, the steel passage passes through the main body and the bowl along the axial direction of the main body, the first slit and the second slit both extend along the axial direction of the main body, the second slit is at least distributed in the bowl, and the diffusion zone is opened in the bowl and is separated from the diameter-changing section of the bowl.

[0007] In some embodiments, the second slit is spaced from the diffusion zone at a connection point with the first slit.

[0008] In some embodiments, the annular width of the first slit and the annular width of the second slit are both constant values.

[0009] In some embodiments, the annular width of the second slit is 2-3 times the annular width of the first slit.

[0010] In some embodiments, the ring width of the first slit is 0.7 mm-1.0 mm, and the ring width of the second slit is 1.5 mm-3.0 mm.

[0011] In some embodiments, the second gap includes a first annular gap, a second annular gap and a third annular gap connected in sequence in the axial direction of the water outlet, the second annular gap is opposite to the diffusion zone, and the first annular gap and the third annular gap are staggered from the diffusion zone in the axial direction of the water outlet.

[0012] In some embodiments, the water outlet is provided with an air nozzle, one end of which is a nozzle for connecting to an air source, and the other end of the air nozzle is connected to the first slit, and the connection point between the air nozzle and the first slit is spaced from the end of the first slit away from the second slit.

[0013] A tundish comprises a tundish body and the above-mentioned nozzle installed on the tundish body.

[0014] A continuous casting device comprises the above-mentioned tundish.

[0015] The beneficial effects of the present application are as follows: a nozzle for a tundish is provided, the nozzle is provided with a steel-passing channel, a crack and a dispersion zone, the steel-passing channel runs through the nozzle, molten steel flows in the steel-passing channel, the crack is sleeved outside the steel-passing channel, and the crack is spaced from the steel-passing channel, the crack is annular in shape, the crack includes a first crack and a second crack, the shapes of the first crack and the second crack are both annular, the second crack is connected to an axial end of the first crack, is connected to an air source through the first crack, and the annular width of the second crack is limited to be greater than the annular width of the first crack, the dispersion zone is connected to the outer peripheral side of the steel-passing channel and the inner peripheral side of the second crack, side; when molten steel flows along the nozzle, the gas source sends argon into the first crack, and the argon flows from the first crack to the second crack and then enters the steel passage through the dispersion zone, which plays a role in preventing air from entering the nozzle; when the flow velocity and pressure of the argon are unstable, when the argon enters the second crack from the first crack, since the annular width of the second crack is greater than the annular width of the first crack, the flow fluctuation or pressure fluctuation of the argon blown out of the dispersion zone caused by the pressure fluctuation of the gas source pipeline can be reduced or even eliminated, thereby improving the adverse situation of the nozzle nodule falling off, and improving the casting stability, continuity and ingot quality of the casting machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention.

[0017] Figure 1 A schematic diagram of the structure of a nozzle for a tundish provided in this application;

[0018] Figure 2 for Figure 1 A partial enlarged view of .

[0019] The accompanying drawings are marked with: 11-main body, 12-bowl part, 121-reducing section, 13-steel shell, 2-steel passage, 3-crevice, 31-first crevice, 311-second cecal area, 32-second crevice, 321-first annular seam, 322-second annular seam, 323-third annular seam, 4-diffusion area, 5-air nozzle. DETAILED DESCRIPTION

[0020] In the prior art of the tundish sprue, the sprue is provided with a steel-passing channel, which runs through the sprue and extends axially of the sprue, and is used for the circulation of molten steel; the sprue is provided with a slit and a diffusion zone, and the slit is connected to a gas source. In actual production, argon is often used as the gas source, and the argon enters the slit and then diffuses into the steel-passing channel through the diffusion zone, thereby preventing air from entering the sprue.

[0021] In the prior art of the tundish nozzle, the ring width of the slit is a certain value, and the ring width refers to the difference between the outer diameter and the inner diameter of the ring. When the argon gas blown into the argon gas slit in the nozzle has an unstable flow velocity or pressure, the slit cannot effectively buffer the flow velocity fluctuation or pressure fluctuation of the argon gas, which will cause the nozzle nodule to fall off.

[0022] This application provides a nozzle for a tundish, please refer to Figure 1 , the water nozzle is provided with a steel-passing channel 2, a crack 3 and a dispersion zone 4, the water nozzle is provided with a steel-passing channel 2, the steel-passing channel 2 runs through the water nozzle, and the steel-passing channel 2 extends along the axial direction of the water nozzle. The crack 3 is sleeved outside the steel-passing channel 2 at intervals, which means that the crack 3 is sleeved outside the steel-passing channel 2 and the crack 3 is spaced from the steel-passing channel 2, the crack 3 is annular in shape, the crack 3 includes a first crack 31 and a second crack 32, the first crack 31 and the second crack 32 are both annular in shape, one axial end of the second crack 32 is connected to one axial end of the first crack 31, and is connected to the gas source through the first crack 31. In particular, in the present application, the annular width of the second crack 32 is greater than the annular width of the first crack 31, and the dispersion zone 4 is connected to the outer peripheral side of the steel-passing channel 2 and the inner peripheral side of the second crack 32.

[0023] When molten steel flows along the nozzle, the gas source delivers argon into the first slit 31, and the argon flows from the first slit 31 to the second slit 32 and then enters the steel passage 2 through the dispersion zone 4, thereby preventing air from entering the nozzle.

[0024] When the flow velocity and pressure of argon are unstable, when argon enters the second slit 32 from the first slit 31, since the ring width of the second slit 32 is greater than the ring width of the first slit 31, the flow fluctuation or pressure fluctuation of argon blown out of the diffusion zone 4 caused by the pressure fluctuation of the gas source pipeline can be reduced or even eliminated, and the flow and pressure of argon in the diffusion zone 4 are stable, thereby improving the unfavorable situation of the nodule falling off. By improving the unfavorable situation of the nodule falling off, the jump points of the crystallizer liquid level are reduced, and the stability, continuity and quality of the casting of the casting machine are improved.

[0025] In the prior art of the water inlet of the tundish, the water inlet includes a main body 11, a bowl 12 and a steel shell 13. The main body 11 is connected to the bowl 12. The bowl 12 is located at one axial end of the main body 11. The steel passage 2 penetrates the main body 11 and the bowl 12 along the axial direction of the main body 11. The dispersion zone 4 is located at the lower part of the main body 11.

[0026] In the nozzle for the tundish provided in this application, please refer to Figure 1 , the first slit 31 and the second slit 32 both extend along the axial direction of the body 11. In some embodiments, the diffusion zone 4 is opened in the bowl portion 12, and the diffusion zone 4 is spaced apart from the variable diameter section 121 of the bowl portion 12. The variable diameter section 121 of the bowl portion 12 refers to the portion of the bowl portion 12 where the inner hole diameter changes. The bowl portion 12 also includes a ring section where the inner hole diameter remains unchanged. The variable diameter section 121 is connected to the ring section, and the ring section is connected to the body 11; please refer to Figure 1 The second slits 32 are distributed at least in the bowl portion 12. Two distribution schemes of the second slits 32 are expressed here. One distribution scheme is as follows: Figure 2 The second slits 32 shown are distributed not only in the bowl portion 12 but also in the body 11 . Another distribution scheme is that the second slits 32 are distributed only in the bowl portion 12 .

[0027] In actual production, the nozzle is used in conjunction with a stopper rod, and the stopper rod is inserted into the nozzle, and the stopper rod is in close contact with the bowl 12 of the nozzle. When molten steel flows through, the area near the close contact position between the stopper rod and the bowl 12 is a negative pressure area, and it is easy for blockages to form near the close contact position, thereby causing a nodule problem at the close contact position. In this application, the dispersion zone 4 is set at the bowl 12, and argon gas is blown into the steel passage 2 at the bowl 12 of the nozzle through the dispersion zone 4, thereby solving the nodule problem at the close contact position between the stopper rod and the bowl 12.

[0028] In some embodiments, Figure 2As shown, the connecting part of the second slit 32 and the first slit 31 is spaced from the diffusion zone 4, so that the second slit 32 is distributed not only in the bowl portion 12 but also in the body 11. Compared with the solution that the second slit 32 is only distributed in the bowl portion 12, the solution that the second slit 32 is distributed not only in the bowl portion 12 but also in the body 11 is adopted, and the part where the second slit 32 is distributed in the body 11 improves the stable regulation of argon gas, and improves the flow stability and pressure stability of argon gas.

[0029] In some embodiments, the ring width of the second slit 32 is greater than the ring width of the first slit 31. Figure 2 The annular width of the first slit 31 and the annular width of the second slit 32 are both constant values, so that the cross-section of the connecting point between the first slit 31 and the second slit 32 presents a sudden change. When the inventor applied this solution in actual production, he achieved good results in maintaining the flow stability and pressure stability of argon gas.

[0030] In some embodiments, the ring width of the second slit 32 is 2 to 3 times the ring width of the first slit 31 .

[0031] In some embodiments, the ring width of the first slit 31 is 0.7mm-1.0mm, and the ring width of the second slit 32 is 1.5mm-3.0mm. When the inventor applied this solution in actual production, he achieved excellent results in maintaining the flow stability and pressure stability of argon gas.

[0032] When this solution is applied, the first crack 31 is filled with wax paper, and when the wax paper evaporates at high temperature, some ash remains, and the second crack 32 is filled with wax strips, and when the wax strips evaporate at high temperature, they can evaporate very cleanly.

[0033] In some embodiments, please refer to Figure 1 and Figure 2 The second gap 32 includes a first annular gap 321, a second annular gap 322 and a third annular gap 323 which are connected in sequence in the axial direction of the nozzle. The second annular gap 322 is directly opposite to the dispersion zone 4. The first annular gap 321 and the third annular gap 323 are staggered from the dispersion zone 4 in the axial direction of the nozzle. The first annular gap 321 is located on the side of the dispersion zone 4 away from the first gap 31 in the axial direction of the nozzle. The third annular gap 323 is located on the side of the dispersion zone 4 facing the first gap 31 in the axial direction of the nozzle. Figure 2As shown, the first annular gap 321 can also be called the first cecum area, which means that there is an opening only on one side and the opening is connected to the second annular gap 322. Therefore, in a specific application, the remaining part of the ash volatilized by the wax paper at high temperature enters the first annular gap 321 under the action of air pressure, and the remaining part of the ash is retained in the first annular gap 321. This solution significantly reduces the amount of ash entering the dispersion zone 4 per unit time, and even if a small amount of ash is blown into the dispersion zone 4, the problem of the dispersion zone 4 being blocked by ash can be improved.

[0034] In the prior art of the tundish nozzle, the nozzle is provided with a gas nozzle 5, one end of the gas nozzle 5 is a mouth, the mouth is located on the surface of the nozzle, and the gas source is connected through the mouth, and the other end of the gas nozzle 5 is connected with the slit 3. In some embodiments of the present application, the end of the gas nozzle 5 away from the mouth is connected with the first slit 31, and the connection between the gas nozzle 5 and the first slit 31 is spaced from the end of the first slit 31 away from the second slit 32, thereby forming Figure 1 The wax paper located in the first slit 31 evaporates the remaining ash at high temperature, and the argon gas entering the first slit 31 can limit part of the ash in the second slit 311 through air pressure. The second slit 311 plays the role of temporarily storing the ash, further improving the problem of the diffusion zone 4 being blocked by the ash.

[0035] The present application also provides a tundish, which includes a tundish body and the above-mentioned nozzle, the nozzle is installed on the tundish body, and the molten steel is distributed to each crystallizer through the tundish. The tundish of the present application improves the problem of the dispersion zone 4 being blocked, improves the unfavorable situation of the nozzle nodules falling off, and improves the casting stability, continuity and billet quality of the casting machine.

[0036] The present application also provides a continuous casting device, which includes the above-mentioned tundish. The continuous casting device of the present application is used to continuously cast molten steel, thereby improving the casting stability, continuity and quality of the casting ingot.

[0037] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0038] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A nozzle for a tundish, the nozzle being provided with: Steel passage; Slits are sleeved outside the steel passage at intervals, the slits include a first slit and a second slit connected to one axial end of the first slit, the first slit is used to connect to the gas source, and the annular width of the second slit is greater than the annular width of the first slit; The dispersion zone is connected to the outer peripheral side of the steel passage and the inner peripheral side of the second slit.

2. The nozzle according to claim 1, characterized in that: The water outlet comprises a body and a bowl portion connected to one axial end of the body; The steel passage penetrates the body and the bowl portion along the axial direction of the body; The first slit and the second slit both extend along the axial direction of the body, and the second slit is at least distributed in the bowl portion; The diffusion zone is opened in the bowl portion and is spaced apart from the diameter-changing section of the bowl portion.

3. The nozzle according to claim 2, characterized in that: The connection point between the second slit and the first slit is spaced from the diffusion zone.

4. The nozzle according to claim 3, characterized in that: The annular width of the first slit and the annular width of the second slit are both constant values.

5. The nozzle according to any one of claims 1 to 4, characterized in that: The ring width of the second slit is 2-3 times the ring width of the first slit.

6. The nozzle according to any one of claims 1 to 4, characterized in that: The ring width of the first slit is 0.7mm-1.0mm, and the ring width of the second slit is 1.5mm-3.0mm.

7. The nozzle according to any one of claims 1 to 4, characterized in that: The second slit includes a first annular slit, a second annular slit and a third annular slit which are sequentially connected in the axial direction of the water outlet, the second annular slit is directly opposite to the diffusion zone, and the first annular slit and the third annular slit are staggered from the diffusion zone in the axial direction of the water outlet.

8. The nozzle according to claim 7, characterized in that: The water inlet is provided with an air nozzle, one end of which is a nozzle for connecting to an air source, and the other end of the air nozzle is connected to the first slit, and the connection point between the air nozzle and the first slit is spaced from the end of the first slit away from the second slit.

9. A tundish, characterized in that: The invention comprises a package body and a nozzle as claimed in any one of claims 1 to 8 installed on the package body.

10. A continuous casting device, characterized in that: Comprising the tundish as claimed in claim 9.

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