Protective pouring device for submersed nozzle of tundish

Abstract

The utility model relates to the technical field of metallurgical production continuous casting, and discloses a tundish submersed nozzle protection pouring device which comprises a tundish, a lower nozzle installed on the tundish, a brick cup arranged on the tundish, the lower nozzle fixed on the brick cup and a tundish submersed nozzle in butt joint with the lower nozzle. The device further comprises an argon blowing ring and an argon hood, the argon blowing ring is arranged on the outer side of the inlet end of the tundish submersed nozzle, and the argon hood is fixed to the bottom of the tundish. Argon output by the argon blowing ring passes through the argon hood to form a cylindrical air curtain which is connected with the outlet end of the collector nozzle and the inlet end of the tundish submersed nozzle in a sleeving mode. In practice, argon can be blown in a large amount, the conditions that the argon amount is small and the air curtain sealing effect is poor can be effectively avoided, the control difficulty of the argon blowing amount is reduced, molten steel in the tundish submersed nozzle can be effectively protected, and the good sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous casting in metallurgical production, and more specifically to a tundish immersion type nozzle protection pouring device. Background Art

[0002] A downspout is fixed on the tundish by a seat brick, and the outlet end of the downspout is butted against the inlet end of the immersion nozzle of the tundish. The butt joint needs to be sealed and protected to prevent air from entering the butt joint, which is also called protective pouring. Protective pouring can effectively prevent the molten steel from contacting with the air, reduce the secondary oxidation of the molten steel by oxygen in the air, and reduce the inclusion content in the molten steel.

[0003] The utility model patent with the authorization announcement number CN201423444Y discloses a ladle long nozzle, which belongs to the field of continuous casting production, including a nozzle body, a steel sleeve, an air outlet slit and an air inlet hole. The nozzle body is in contact with the steel sleeve, and an air equalization pipe is provided on the upper part of the steel sleeve. The air inlet hole is opened on the air equalization pipe, and micro air outlet holes are evenly distributed on the air equalization pipe. The micro air outlet holes are connected to the air outlet slit, and the micro air outlet holes pass through the steel sleeve. The cross-sectional area of ​​the air equalization pipe is larger than the cross-sectional area of ​​the micro air outlet holes. The use of this device can reduce or remove the structural gap between the steel sleeve and the nozzle body, and can make the argon gas curtain evenly distributed.

[0004] The air outlet seam in the above scheme is toward the inner side of the nozzle body. When the amount of argon is large, it is easy for argon to enter the submerged nozzle of the tundish, causing the liquid level of the molten steel in the tundish to turn over, secondary oxidation of the steel, and bubbles under the skin of the ingot. When the amount of argon is small, it cannot play the role of air curtain sealing, the amount of argon blowing is difficult to control, and the protection of internal water cannot be guaranteed. Utility Model Content

[0005] The utility model aims to overcome the defects of the prior art and provides a tundish immersion nozzle protection pouring device for solving the technical problems of difficulty in controlling the argon blowing amount and insufficient protection of the internal molten steel.

[0006] The technical solution adopted by the utility model is a tundish immersed nozzle protective pouring device, comprising a tundish, a down nozzle installed on the tundish, a seat brick provided on the tundish, a down nozzle fixed on the seat brick, and a tundish immersed nozzle docking with the down nozzle; further comprising an argon blowing ring and an argon hood, the argon blowing ring being arranged on the outer side of the inlet end of the tundish immersed nozzle, and the argon hood being fixed on the bottom of the tundish; the argon gas output by the argon blowing ring passes through the argon hood to form a cylindrical gas curtain which sleeves the down nozzle outlet end and the inlet end of the tundish immersed nozzle.

[0007] In this scheme, argon passes through the argon hood to form a cylindrical air curtain. The air curtain is roughly parallel to the outer wall of the tundish submerged nozzle and the outer wall of the lower nozzle, and is not directed toward the inner side of the nozzle port, which can prevent argon from entering the interior. At the same time, the argon blowing ring conveys argon upward from the outer side of the inlet end of the tundish submerged nozzle. The argon air curtain is far away from the outlet end of the lower nozzle and the inlet end of the tundish submerged nozzle. After being reflected by the argon hood, the gas volume and impact force of the argon are reduced. Therefore, when the gas volume is large, the argon gas will not enter from the joint between the outlet end of the lower nozzle and the inlet end of the tundish submerged nozzle, which can effectively prevent the molten steel in the tundish from turning over and secondary oxidation of the steel, and the appearance of bubbles under the skin of the ingot. At the same time, since argon is blown upward from the outer side of the inlet end of the tundish submerged nozzle and is not blown toward the inner side of the nozzle port, a large amount of argon can be blown in practice, which can effectively avoid the situation where the argon volume is small and the air curtain sealing effect is poor. This scheme reduces the difficulty of controlling the argon blowing volume, can effectively protect the molten steel in the tundish submerged nozzle, and has a good sealing effect.

[0008] Furthermore, the argon hood includes a bell hood and an annular member, the annular member is fixed to the bottom of the tundish, the smaller port of the bell hood is fixedly connected to the annular member, and the larger port of the bell hood faces the argon blowing ring. The annular member mainly plays a fixing role, and the bell hood mainly plays a role in gathering and accumulating argon gas, so that a thicker gas curtain is formed between the outlet end of the lower water port and the inlet end of the immersion water port of the tundish, so as to improve the sealing effect of the gas curtain.

[0009] Furthermore, the diameter of the smaller port of the bell cover is equal to the inner diameter of the annular member, and the bell cover and the annular member are arranged concentrically. The annular member can better seal the outer side of the smaller port of the bell cover with the bottom of the tundish, preventing argon gas from leaking from the smaller port of the bell cover and the bottom of the tundish.

[0010] Furthermore, the horn cover and the annular member are integrally formed, which has higher strength, better sealing, is more convenient for forming an air curtain, and is also easy to manufacture.

[0011] Furthermore, the argon blowing ring is concentrically arranged with the argon gas cover to cooperate in forming a uniform gas curtain, so as to improve the sealing effect of the argon gas curtain.

[0012] Furthermore, the argon blowing ring has a plurality of gas outlet holes in a circular array around its center, and the argon blowing ring is provided with a gas inlet hole. The plurality of gas outlet holes are used to output gas to form a gas curtain, and the gas inlet hole is used to connect an external argon gas output pipeline to input argon gas into the argon blowing ring.

[0013] Furthermore, the diameter of the circular array of the gas outlet holes is smaller than the diameter of the smaller port of the bell cover. The argon gas outputted from the gas outlet holes directly reaches the bottom of the tundish upwards, forming a gas curtain that goes vertically upwards. If the diameter of the circular array of the gas outlet holes is larger than the diameter of the smaller port of the bell cover, the argon gas outputted from the gas outlet holes will directly touch the inner wall of the bell cover upwards, causing turbulence, which is not conducive to forming a gas curtain and restraining the accumulation of argon gas.

[0014] Furthermore, a fixed support ring is sleeved on the immersion nozzle of the tundish, and the argon blowing ring is fixed on the fixed support ring. The argon blowing ring is more easily disassembled and installed through the fixed support ring, and the installation and maintenance are convenient, and the installation is stable and firm.

[0015] Furthermore, an asbestos fiber sealing pad and a high temperature resistant clay pad are provided between the outlet end of the water outlet and the inlet end of the tundish immersion water outlet, wherein the asbestos fiber sealing pad contacts the water outlet, and the high temperature resistant clay pad contacts the tundish immersion water outlet. The high temperature resistant clay pad can improve the sealing performance between the water outlet and the tundish immersion water outlet, prevent argon gas from entering, and effectively avoid secondary oxidation of molten steel in the tundish.

[0016] Furthermore, the outlet end of the water down hole is spherical, and the inner side of the inlet end of the tundish immersion water down hole is spherical. The spherical outlet end of the water down hole and the spherical inlet end of the tundish immersion water down hole have a higher sealing performance, which can further prevent argon gas from entering from the butt joint gap, and also prevent air from entering from the butt joint gap, so as to ensure the quality of the molten steel in the tundish.

[0017] Compared with the prior art, the utility model has the following beneficial effects: in the present invention, the argon gas passes through the argon hood to form a cylindrical gas curtain, which is roughly parallel to the outer wall of the immersion nozzle and the outer wall of the lower nozzle of the tundish, and is not directed toward the inner side of the nozzle port, thereby preventing the argon gas from entering the interior; at the same time, the argon blowing ring transports the argon gas upward from the outer side of the inlet end of the immersion nozzle of the tundish, and the argon gas curtain is far away from the outlet end of the lower nozzle and the inlet end of the immersion nozzle of the tundish. After being reflected by the argon hood, the gas volume and impact force of the argon gas are reduced, so the argon gas with a large gas volume will not enter from the lower nozzle. The outlet end enters at the joint of the inlet end of the submerged nozzle of the tundish, which can effectively prevent the molten steel in the tundish from turning over and secondary oxidation of the steel, and the appearance of bubbles under the skin of the ingot. At the same time, since argon is blown upward from the outside of the inlet end of the submerged nozzle of the tundish, and not toward the inside of the nozzle port, a large amount of argon can be blown in practice, which can effectively avoid the situation where the argon amount is small and the air curtain sealing effect is poor. This scheme reduces the difficulty of controlling the argon blowing amount, can effectively protect the molten steel in the submerged nozzle of the tundish, and has a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Figure 2 The utility model is a schematic diagram of the structure of the asbestos fiber sealing pad and the high-temperature clay pad.

[0020] Figure 3 It is a schematic diagram of the structure of the argon blowing ring of the utility model.

[0021] In the figure: 1, water outlet, 2, seat brick, 3, tundish, 4, argon hood, 5, argon blowing ring, 6, fixed support ring, 7, tundish immersed water outlet, 8, asbestos fiber sealing gasket, 9, high-temperature clay gasket, 10, trumpet cover, 11, ring part, 12, air outlet, 13, air inlet. DETAILED DESCRIPTION

[0022] The drawings of the present invention are only used for illustrative purposes and cannot be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0023] like Figure 1 As shown, the present scheme discloses a tundish submerged nozzle protective pouring device, comprising a tundish 3, a water outlet 1 installed on the tundish 3, a seat brick 2 provided on the tundish 3, the water outlet 1 fixed on the seat brick 2, and a tundish submerged nozzle 7 connected to the water outlet 1; further comprising an argon blowing ring 5 and an argon hood 4, the argon blowing ring 5 being arranged on the outer side of the inlet end of the tundish submerged nozzle 7, and the argon hood 4 being fixed on the bottom of the tundish 3; the argon gas output by the argon blowing ring 5 passes through the argon hood 4 to form a cylindrical gas curtain which is sleeved over the outlet end of the water outlet 1 and the inlet end of the tundish submerged nozzle 7.

[0024] In this scheme, argon passes through the argon hood 4 to form a cylindrical air curtain. The air curtain is roughly parallel to the outer wall of the tundish submerged nozzle 7 and the outer wall of the lower nozzle 1, and is not toward the inner side of the nozzle. At the same time, the argon blowing ring 5 transports argon upward from the outer side of the inlet end of the tundish submerged nozzle 7. The argon air curtain is far away from the outlet end of the lower nozzle 1 and the inlet end of the tundish submerged nozzle 7. After being reflected by the argon hood 4, the gas volume and impact force of the argon are reduced. Therefore, when the gas volume is large, the argon gas will not enter from the joint between the outlet end of the lower nozzle 1 and the inlet end of the tundish submerged nozzle 7, which can effectively prevent the molten steel in the tundish 3 from turning over and secondary oxidation of the steel and the appearance of bubbles under the skin of the ingot. At the same time, since argon is blown upward from the outer side of the inlet end of the submerged nozzle, a large amount of argon can be blown in practice, which can effectively avoid the situation where the argon volume is small and the air curtain sealing effect is poor. This scheme reduces the difficulty of controlling the argon blowing volume, so that the molten steel in the tundish submerged nozzle 7 is effectively protected.

[0025] The argon hood 4 includes a trumpet cover 10 and an annular member 11. The annular member 11 is fixed to the bottom of the tundish 3. The smaller port of the trumpet cover 10 is fixedly connected to the annular member 11, and the larger port of the trumpet cover 10 faces the argon blowing ring 5. The annular member 1 and the trumpet cover 10 are both sleeved on the water outlet 1. The annular member 11 mainly plays a fixing role, and the trumpet cover 10 mainly plays a role in gathering and accumulating argon gas, so that a thicker gas curtain is formed between the outlet end of the water outlet 1 and the inlet end of the immersion water outlet 7 of the tundish, so as to improve the sealing effect of the gas curtain. The argon blowing ring 5 is concentrically arranged with the argon hood 4. The concentric arrangement cooperates to form a uniform gas curtain to improve the sealing effect of the argon gas curtain.

[0026] The diameter of the smaller port of the bell cover 10 is equal to the inner diameter of the ring 11, and the bell cover 10 and the ring 11 are concentrically arranged. The ring 11 can better seal the outer side of the smaller port of the bell cover 10 and the bottom of the tundish 3, preventing argon gas from leaking from the smaller port of the bell cover 10 and the bottom of the tundish 3. The bell cover 10 and the ring 11 are integrally formed. The integral molding has higher strength, better sealing, is more convenient for forming an air curtain, and is also convenient for production and manufacturing.

[0027] like Figure 2 As shown, an asbestos fiber sealing pad 8 and a high temperature resistant clay pad 9 are arranged between the outlet end of the water outlet 1 and the inlet end of the tundish immersion water outlet 7, the asbestos fiber sealing pad 8 contacts the water outlet 1, and the high temperature resistant clay pad 9 contacts the tundish immersion water outlet 7. The high temperature resistant clay pad 9 can improve the sealing between the water outlet 1 and the tundish immersion water outlet 7, can prevent argon gas from entering, and can effectively avoid the secondary oxidation of the molten steel in the tundish 3.

[0028] The outlet end of the water down hole 1 is spherical, and the inner side of the inlet end of the tundish immersion water inlet 7 is spherical. The spherical outlet end of the water down hole 1 and the spherical inlet end of the tundish immersion water inlet 7 have a higher sealing performance, which can further prevent argon gas from entering from the butt joint gap, and also prevent air from entering from the butt joint gap, which can ensure the quality of the molten steel in the tundish 3.

[0029] like Figure 1 and 3 As shown, a fixed support ring 6 is sleeved on the tundish submerged nozzle 7, and the argon blowing ring 5 is fixed on the fixed support ring 6. The argon blowing ring 5 is more easily disassembled and installed through the fixed support ring 6, and the installation and maintenance are convenient, and the installation stability and firmness are high.

[0030] There are a number of gas outlet holes 12 in a circular array around the center of the end side of the argon blowing ring 5, and an air inlet hole 13 is provided on the argon blowing ring 5. The gas outlet holes 12 are used to output gas to form a gas curtain, and the air inlet hole 13 is used to connect an external argon gas output pipeline to input argon gas into the argon blowing ring 5. The diameter of the circular array of the gas outlet holes 12 is smaller than the diameter of the smaller port of the horn cover 10. The argon gas output by the gas outlet holes 12 goes straight up to the bottom of the tundish 3 to form a vertically upward gas curtain. If the diameter of the circular array of the gas outlet holes 12 is larger than the diameter of the smaller port of the horn cover 10, the argon gas output by the gas outlet holes 12 will directly touch the inner wall of the horn cover 10 upward to cause turbulence, which is not conducive to forming a gas curtain and restraining the accumulation of argon gas.

[0031] Instructions for use: First, fix the argon blowing ring 5 on the fixed support ring 6, and fix the argon hood 4 on the bottom of the tundish 3. When installing, place the high-temperature clay pad 9 and the asbestos fiber sealing pad 8 in sequence on the inner side of the inlet end of the immersion nozzle 7 of the tundish, and then connect the outlet end of the lower nozzle 1 to the inlet end of the immersion nozzle 7 of the tundish, squeeze the asbestos fiber sealing pad 8 and the high-temperature clay pad 9 to form a seal. When in use, blow air into the argon blowing ring 5 through the air inlet 13, and the argon gas is output upward from the plurality of air outlets 12 until it reaches the bottom of the tundish 3 to form a cylindrical air curtain. The argon hood 4 plays the role of gathering and accumulating argon gas, so that the outlet end of the lower nozzle 1 and the inlet end of the immersion nozzle 7 of the tundish are closely connected. A thicker air curtain is formed at the end to improve the sealing effect of the air curtain. The air curtain is roughly parallel to the outer wall of the tundish submerged nozzle 7 and the outer wall of the lower nozzle 1. When the gas volume is large, it is difficult for argon to enter from the joint between the outlet end of the lower nozzle 1 and the inlet end of the tundish submerged nozzle 7. It can effectively avoid the secondary oxidation of the molten steel in the tundish 3 and the appearance of bubbles under the skin of the ingot. At the same time, since argon is blown upward from the outside of the inlet end of the tundish submerged nozzle 7, a large amount of argon can be blown in practice, which can effectively avoid the situation where the argon volume is small and the air curtain sealing effect is poor. This scheme reduces the difficulty of controlling the amount of argon blowing, so that the molten steel in the tundish submerged nozzle 7 is effectively protected.

[0032] Obviously, the above embodiments of the utility model are only examples for clearly explaining the technical solution of the utility model, and are not intended to limit the specific implementation methods of the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the claims of the utility model shall be included in the protection scope of the claims of the utility model.

Claims

1. A tundish immersion nozzle protection pouring device, characterized in that: The invention comprises a tundish (3), a water outlet (1) installed on the tundish (3), and a tundish immersion water outlet (7) connected to the water outlet (1); and also comprises an argon blowing ring (5) and an argon hood (4), wherein the argon blowing ring (5) is arranged outside the inlet end of the tundish immersion water outlet (7), and the argon hood (4) is fixed to the bottom of the tundish (3); the argon gas output by the argon blowing ring (5) passes through the argon hood (4) to form a cylindrical gas curtain which is sleeved with the outlet end of the water outlet (1) and the inlet end of the tundish immersion water outlet (7).

2. The tundish immersion nozzle protection pouring device according to claim 1, characterized in that: The argon hood (4) comprises a bell hood (10) and an annular member (11), wherein the annular member (11) is fixed to the bottom of the tundish (3), the smaller port of the bell hood (10) is fixedly connected to the annular member (11), and the larger port of the bell hood (10) faces the argon blowing ring (5).

3. The tundish immersion nozzle protection pouring device according to claim 2, characterized in that: The diameter of the smaller port of the horn cover (10) is equal to the inner diameter of the annular member (11), and the horn cover (10) and the annular member (11) are arranged concentrically.

4. The tundish immersion nozzle protection pouring device according to claim 2, characterized in that: The horn cover (10) and the annular member (11) are integrally formed.

5. The tundish immersion nozzle protection pouring device according to claim 2, characterized in that: The argon blowing ring (5) is arranged concentrically with the argon gas cover (4).

6. The tundish submerged nozzle protection pouring device according to claim 2, characterized in that: A plurality of gas outlet holes (12) are arranged in a circular array around the center of the argon blowing ring (5) at the end side, and a gas inlet hole (13) is arranged on the argon blowing ring (5).

7. The tundish immersion nozzle protection pouring device according to claim 6, characterized in that: The diameter of the circular array of the air outlet holes (12) is smaller than the diameter of the smaller port of the horn cover (10).

8. The tundish submerged nozzle protection pouring device according to claim 2, characterized in that: A fixed support ring (6) is sleeved on the tundish submerged water inlet (7), and the argon blowing ring (5) is fixed on the fixed support ring (6).

9. A tundish submerged nozzle protection pouring device according to any one of claims 1 to 8, characterized in that: An asbestos fiber sealing pad (8) and a high temperature resistant clay pad (9) are provided between the outlet end of the water outlet (1) and the inlet end of the tundish immersed water outlet (7); the asbestos fiber sealing pad (8) contacts the water outlet (1), and the high temperature resistant clay pad (9) contacts the tundish immersed water outlet (7).

10. A tundish submerged nozzle protection pouring device according to any one of claims 1 to 8, characterized in that: The outlet end of the water outlet (1) is spherical, and the inner side of the inlet end of the tundish immersion water outlet (7) is spherical.

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