Tundish capable of preventing molten steel from generating slag holes and slag entrapment and operation method of tundish

Abstract

The invention relates to the technical field of continuous casting production, in particular to a tundish capable of preventing molten steel from generating slag holes and slag entrapment and an operation method of the tundish. The long nozzle is arranged above the tundish main body; the first suppressor is arranged outside the long nozzle; the argon supply assembly is arranged on the outer side of the tundish body and communicates with the first suppressor. The lifter is arranged above the first suppressor and is connected with the upper wall of the first suppressor; the liquid level sensor is arranged in the tundish main body; the controller is arranged on the outer side of the tundish body and connected with the argon supply assembly, the liquid level sensor and the lifter. The first suppressor is controlled to ascend or descend in the using process, so that the lower edge of the first suppressor is slightly lower than a slag-metal interface in the tundish all the time, the continuity of the argon atmosphere is guaranteed, slag holes and entrapment slag generated in the tundish are greatly suppressed, the influence on a molten steel flow field is reduced, the cleanliness of molten steel is improved, and the service life of the tundish is prolonged. And the quality of the continuous casting billet is improved.

Description

Technical Field

[0001] The invention relates to the technical field of continuous casting production, in particular to a tundish for preventing molten steel from generating slag eyes and slag rolls and an operating method thereof. Background Art

[0002] Continuous casting is widely used in today's steel industry. It has the characteristics of improving production efficiency, increasing metal yield, easy mechanization and automation, and reducing energy consumption. The tundish is an indispensable part of the continuous casting process. The tundish is the intermediate link between the ladle and the continuous casting crystallizer. In the continuous casting process, it has the functions of stabilizing the casting of molten steel, reducing the erosion of the solidified shell in the crystallizer by the steel flow, and reducing the contamination of the molten steel in the tundish by the outside world. The cleanliness of the molten steel in the tundish will directly affect the quality of the ingot, so effectively improving the cleanliness of the molten steel in the tundish is crucial to the quality of the ingot.

[0003] However, during the continuous casting process, especially the non-steady-state casting, the long water inlet of the tundish is affected by the upward reflux of the molten steel, which is very likely to cause slag eyes, resulting in exposed molten steel, or slag rolling, that is, the molten steel sucks the covering agent, etc., which seriously deteriorates the cleanliness of the molten steel.

[0004] Installing an inhibitor on the tundish to prevent slag eyes and slag curling in the molten steel is an effective means to solve the problem of molten steel in the tundish being exposed and causing oxidation, and slag curling causing inclusions in the molten steel, thereby eliminating the phenomenon of slag eyes and slag curling in the tundish. However, in existing domestic patents, such as the Chinese patent with publication number CN221289502U, a long water nozzle and continuous casting equipment are proposed. Although the patent uses a long water nozzle and continuous casting equipment to effectively isolate the direct contact between the molten steel and the air in the slag eye area and reduce the secondary oxidation of the molten steel, the equipment cannot eliminate the influence of the molten steel entrainment covering agent in the tundish. The Chinese patent with publication number CN116475399A proposes an active continuous casting tundish slag eye control mechanism and method. The patent makes the molten steel flow entering the tundish in a state of low kinetic energy when impacting the bottom of the tundish, weakens the recoil steel flow, and thus avoids the slag eyes in the tundish that affect the purity of the steel.

[0005] To this end, the present application provides a tundish and an operating method thereof for preventing slag eyes and slag rolls from forming in molten steel. Summary of the invention

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a tundish and an operating method thereof for preventing slag eyes and slag curls from forming in molten steel, thereby solving the technical problem that slag eyes and slag curls are easily formed in the continuous casting tundish of the prior art, resulting in an increase in the inclusion content in the molten steel and causing deterioration of the surface and internal quality of the ingot.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a tundish for preventing slag eyes and slag curls in molten steel, comprising: a tundish body; a long water nozzle arranged above the tundish body; a first suppressor arranged outside the long water nozzle and connected to the long water nozzle; an argon supply assembly arranged outside the tundish body and connected to the first suppressor; a lifter arranged above the first suppressor and connected to the upper wall of the first suppressor; a liquid level sensor arranged in the tundish body to monitor the liquid level of the molten steel in the tundish body; and a controller arranged outside the tundish body and connected to the argon supply assembly, the liquid level sensor and the lifter.

[0008] Optionally, a second suppressor is disposed at the bottom of the tundish body.

[0009] Optionally, the first suppressor includes: a first suppressor body, which is sleeved on the outside of the long water outlet; a through hole, which is opened on the upper wall of the first suppressor body, and the long water outlet is penetrated through the through hole; a sealing ring, which is arranged in the through hole; a slag suction plate, which is arranged on the inner wall of the first suppressor body and is detachably connected to the first suppressor body; and a slag separating conical plate, which is arranged below the first suppressor body and is connected to the first suppressor body.

[0010] Optionally, the slag suction plate is a honeycomb plate, a lattice concave plate or a corrugated plate.

[0011] Optionally, the slag-separating cone plate includes: holes, which are arranged through the slag-separating cone plate.

[0012] Optionally, the slag-separating cone plate is made of a fusible material that forms molten steel after melting.

[0013] Optionally, the argon supply assembly includes: an argon storage container, which is arranged on the outside of the intermediate package body; an argon blowing port, which is opened above the first suppressor body; a hard gas pipe, which is arranged on the side of the argon storage container and connected to the argon storage container; a soft gas pipe, which is arranged between the hard gas pipe and the argon blowing port; an argon pressure gauge, which is arranged on the hard gas pipe and connected to the hard gas pipe; an electromagnetic valve, which is arranged adjacent to the argon pressure gauge and connected to the hard gas pipe; and an electronic flow meter, which is arranged adjacent to the electromagnetic valve and connected to the hard gas pipe.

[0014] A second aspect of the present invention provides a method for operating a tundish for preventing molten steel from generating slag eyes and slag rolls, which is applied to the tundish for preventing molten steel from generating slag eyes and slag rolls in the first aspect, and the operating method comprises: S1: Put the first suppressor on the long water nozzle, and connect the argon supply assembly to the first suppressor; S2: Open the argon supply assembly, fill the first suppressor with argon, fill the first suppressor with argon, and blow the argon toward the covering agent in the tundish body; S3: When the first suppressor is used for the first time, the first suppressor is gradually lowered from the long shroud, and argon gas is sprayed step by step through the slag-separating cone plate to spray the covering agent until the lower edge of the first suppressor is slightly lower than the slag-metal interface in the tundish body; S4: During the continuous pouring stage, the controller monitors the liquid level of the slag-metal interface in the tundish body through the liquid level sensor, and controls the lifter to lift or lower the first suppressor, so that the first suppressor rises or falls synchronously with the slag-metal interface, and always keeps the lower edge of the first suppressor slightly lower than the slag-metal interface in the tundish body; S5: After pouring is completed, the long nozzle is replaced and the first suppressor is removed and cleaned.

[0015] The beneficial effects of the present invention are: The present invention provides a tundish for preventing molten steel from generating slag eyes and slag curling and an operation method thereof. A first suppressor is controlled to rise or fall during normal use by a controller, so that the lower edge of the first suppressor is always slightly lower than the slag-metal interface in the tundish body, thereby ensuring the continuity of the argon atmosphere. The first suppressor always maintains a slightly positive pressure environment during the long nozzle casting process, thereby preventing external air from entering the first suppressor to cause oxidation of the molten steel, thereby greatly suppressing the slag eyes and slag curling generated in the tundish, reducing the impact on the flow field of the molten steel, improving the cleanliness of the molten steel, and improving the quality of the continuous casting billet.

[0016] Furthermore, the slag suction plate is arranged on the inner side wall of the first suppressor, reducing the impact and erosion of the molten steel on the first suppressor; the slag suction plate is made of a material that promotes the adsorption of inclusions, and is arranged into a honeycomb plate, a lattice recessed plate or a wavy plate, which is conducive to the adsorption and capture of inclusions or residual covering agents.

[0017] Furthermore, the slag suction plate is detachably connected, and after use, the slag suction plate can be replaced, thereby reducing the use cost.

[0018] Furthermore, the slag separation cone plate is fixed under the first suppressor, which can reduce the leakage of argon before the argon fills the first suppressor; when the first suppressor is immersed in the molten steel in the tundish body, the argon passes through the holes on the surface of the slag separation cone plate, and as the height of the first suppressor decreases, the slag separation cone plate sprays the covering agent step by step, reducing the covering agent from entering the molten steel. In addition, the blown argon will cover the surface of the covering agent or the molten steel, reducing the oxidation of the exposed molten steel.

[0019] Furthermore, the material of the slag-separating cone plate has the same composition as the molten steel in the tundish, and after the lower edge of the first suppressor is completely immersed below the slag-metal interface, the slag-separating cone plate melts to form molten steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a tundish for preventing molten steel from generating slag holes and slag curls according to the present invention; Figure 2 It is a schematic structural diagram of the first suppressor of the present invention (the slag separation cone plate is not shown); Figure 3 It is a structural schematic diagram of the slag-separating cone plate of the present invention; Figure 4 It is a structural schematic diagram of the slag-separating cone plate of the present invention from another angle; Figure 5 This is a schematic structural diagram of the slag suction plate of the present invention being a corrugated plate; Figure 6 This is a schematic diagram of the structure of the slag suction plate of the present invention being a dot matrix concave plate; Figure 7 The present invention is a flow chart of the operation method of the tundish for preventing slag eyes and slag curls from forming in molten steel.

[0021] Description of reference numerals: 1. Tundish body; 2. First suppressor; 3. Slag suction plate; 5. Sealing ring; 6. Lifter; 7. Suppressor pressure gauge; 71. Argon pressure gauge; 8. Argon storage container; 9. Solenoid valve; 10. Electronic flow meter; 11. Controller; 12. Long water inlet; 13. Argon blowing port; 14. Liquid level sensor; 15. Slag separation cone plate; 16. Second suppressor; 17. Hard air pipe; 18. Soft air pipe; 19. First suppressor body; 20. Through hole; 21. Hole. DETAILED DESCRIPTION

[0022] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0023] The embodiment of the present invention provides a tundish for preventing molten steel from generating slag holes and slag rolls, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, it includes: a tundish body 1; a long water nozzle 12, which is arranged above the tundish body 1; a first suppressor 2, which is arranged outside the long water nozzle 12 and is connected to the long water nozzle 12; an argon supply assembly, which is arranged outside the tundish body 1 and is connected to the first suppressor 2; a lifter 6, which is arranged above the first suppressor 2 and is connected to the upper wall of the first suppressor 2; a liquid level sensor 14, which is arranged in the tundish body 1 to monitor the liquid level of the molten steel in the tundish body 1; a controller 11, which is arranged outside the tundish body 1 and is connected to the argon supply assembly, the liquid level sensor 14 and the lifter 6.

[0024] Exemplarily, the controller 11 is electrically connected to the argon supply assembly, the liquid level sensor 14 and the lifter 6, thereby realizing the opening or closing of the argon supply assembly, monitoring of the liquid level data collected by the liquid level sensor 14, and control of the rise or fall of the lifter 6.

[0025] Exemplarily, the shroud 12 is disposed below the external ladle and connected to the external ladle via a clamp, that is, the clamp below the ladle connects the external ladle to the shroud 12. This connection method belongs to the prior art and will not be described in detail herein.

[0026] In a possible embodiment, Figure 1 As shown, the second suppressor 16 is arranged at the bottom of the tundish body 1 .

[0027] Exemplarily, the second suppressor 16 in the present embodiment is a turbulence suppressor. By providing the second suppressor 16, the process of injecting molten steel into the tundish body 1 is buffered, thereby reducing the scouring of the inner wall of the tundish body 1 by the molten steel, and the huge impact of the huge kinetic energy it carries on the bottom of the tundish body 1, that is, directly below the long water nozzle 12, thereby improving the service life of the tundish.

[0028] In a possible embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the first suppressor 2 includes: a first suppressor body 19, which is sleeved on the outside of the long water outlet 12; a through hole 20, which is opened on the upper wall of the first suppressor body 19, and the long water outlet 12 is penetrated through the through hole 20; a sealing ring 5, which is arranged in the through hole 20; a slag suction plate 3, which is arranged on the inner wall of the first suppressor body 19 and is detachably connected to the first suppressor body 19; a slag separating conical plate 15, which is arranged below the first suppressor body 19 and is connected to the first suppressor body 19.

[0029] Exemplarily, the sealing ring 5 is a sealing ring made of refractory wool or refractory fiber such as asbestos, glass fiber, ceramic fiber, etc., and a sealing ring groove is also provided in the through hole 20. By setting the sealing ring 5 in the sealing ring groove, the sealing ring 5 is stuck in the through hole 20, thereby improving the sealing between the long water inlet 12 and the first suppressor 2 to reduce gas leakage in the first suppressor 2.

[0030] For example, the slag suction plate 3 is detachably connected to the first suppressor body 19. After the slag suction plate 3 is used, a new slag suction plate 3 can be replaced to reduce the use cost. The slag suction plate 3 and the first suppressor body 19 can be connected by clamping or bolting. The specific connection method is the existing technology and is not limited here.

[0031] In a possible embodiment, the slag suction plate is a honeycomb plate, a lattice concave plate or a corrugated plate.

[0032] Exemplarily, the slag suction plate 3 is arranged inside the side wall of the first inhibitor 2 to reduce the impact and erosion of the molten steel on the first inhibitor 2; the slag suction plate 3 is made of a material that promotes the absorption of inclusions, such as Figure 5 As shown, the slag suction plate 3 is configured as a corrugated plate, or as Figure 6 As shown, the slag suction plate 3 is arranged as a lattice concave plate, or the slag suction plate 3 is arranged as a honeycomb plate (not shown in the drawings), and the surface of the plate has a large number of concave and convex changes. Such an arrangement is more conducive to the adsorption and capture of inclusions or residual covering agents, and further reduces the contamination of the inclusions or residual covering agents to the molten steel inside the ladle.

[0033] In a possible embodiment, Figure 3 and Figure 4 As shown, the slag-separating cone plate 15 includes: a hole 21, which is arranged through the slag-separating cone plate 15.

[0034] For example, Figure 2 As shown, the slag-separating cone plate 15 is in an inverted cone structure and is fixed under the first suppressor 2 to reduce argon leakage before the argon fills the first suppressor 2; in the process of the first suppressor 2 being immersed in the molten steel in the tundish body 1, the argon passes through the holes 21 on the surface of the slag-separating cone plate 15. As the height of the first suppressor 2 decreases, the slag-separating cone plate 15 sprays the covering agent step by step to reduce the covering agent from entering the molten steel. At the same time, the blown argon will cover the covering agent or the surface of the molten steel to reduce the oxidation of the exposed molten steel, and the slag-separating cone plate 15 with an inverted cone structure can separate the covering agent covering the surface of the molten steel. And the effect of blowing argon through the holes 21 on the slag-separating cone plate 15 is superimposed on the effect of the conical structure of the slag-separating cone plate 15, which greatly reduces the probability and content of inclusions entering the first suppressor 2, while protecting the exposed molten steel from air oxidation and reducing the content of oxides in the molten steel.

[0035] In a possible embodiment, the slag-separating cone plate 15 is made of a fusible material that forms molten steel after melting.

[0036] Exemplarily, the material of the slag-separating cone plate 15 is the same as the composition of the molten steel in the ladle. After the lower edge of the first suppressor 2 is completely immersed below the slag-metal interface, the slag-separating cone plate 15 gradually melts to form molten steel, thus preventing impurities from entering the molten steel and further ensuring the cleanliness of the molten steel.

[0037] In a possible embodiment, Figure 1 and Figure 2 As shown, the argon supply assembly includes: an argon storage container 8, which is arranged on the outside of the intermediate package body 1; an argon blowing port 13, which is opened above the first suppressor body 19; a hard gas pipe 17, which is arranged on the side of the argon storage container 8 and connected to the argon storage container 8; a soft gas pipe 18, which is arranged between the hard gas pipe 17 and the argon blowing port 13; an argon pressure gauge 71, which is arranged on the hard gas pipe 17 and connected to the hard gas pipe 17; an electromagnetic valve 9, which is arranged adjacent to the argon pressure gauge 71 and connected to the hard gas pipe 17; and an electronic flow meter 10, which is arranged adjacent to the electromagnetic valve 9 and connected to the hard gas pipe 17.

[0038] Exemplarily, an argon pressure gauge 71, a solenoid valve 9 and an electronic flowmeter 10 are inserted into the hard gas pipe 17, and a liquid level sensor 14 is arranged inside the intermediate ladle body 1. The above-mentioned equipment is connected to the controller 11 through a data line, and the collected data is input into the controller 11. The solenoid valve 9 is adjusted by the data received by the controller 11, and then the flow rate of argon gas blown in is controlled, thereby controlling the height of the first suppressor 2 relative to the liquid level of the molten steel and the internal pressure.

[0039] Exemplarily, the soft air tube 18 connects the hard air tube 17 and the argon blowing port 13 , and can be deformed, rolled up and stored during the movement of the first suppressor 2 , thereby causing the soft air tube 18 to contract and expand along with the longitudinal movement of the first suppressor 2 .

[0040] In a possible embodiment, Figure 7 As shown, this embodiment further provides a method for operating a tundish for preventing molten steel from generating slag eyes and slag rolls, which is applied to the tundish for preventing molten steel from generating slag eyes and slag rolls in the aforementioned embodiment, and the operating method comprises: S1: Put the first suppressor 2 on the long water nozzle 12, and connect the argon supply assembly to the first suppressor 2; S2: Open the argon supply assembly, fill the first suppressor 2 with argon, fill the first suppressor 2 with argon, and blow the argon toward the covering agent in the tundish body 1; S3: When the first suppressor 2 is used for the first time, the first suppressor 2 is gradually lowered from the long shroud 12, and argon gas blows away the covering agent step by step through the slag-separating conical plate 15 until the lower edge of the first suppressor 2 is slightly lower than the slag-metal interface in the tundish body 1; S4: During the continuous pouring stage, the controller 11 monitors the liquid level of the slag-metal interface in the tundish body 1 through the liquid level sensor 14, and the controller 11 controls the lifter 3 to lift or lower the first suppressor 2, so that the first suppressor 2 rises or falls synchronously with the slag-metal interface, and always keeps the lower edge of the first suppressor 2 slightly lower than the slag-metal interface in the tundish body 1; S5: After the pouring is finished, the long shroud 12 is replaced, and the first suppressor 2 is removed and cleaned.

[0041] Exemplarily, by setting the first suppressor 2 in the tundish body 1, the controller 6 turns on the argon supply assembly to provide argon gas to the first suppressor 2, and the first suppressor 2 rises or falls during replacement and normal use. The controller 11 controls the lower edge of the first suppressor 2 to always be slightly lower than the slag-metal interface in the tundish body 1, and a suppressor pressure gauge 7 is also provided above the first suppressor 2, which is connected to the inside of the tundish body 1, and then by monitoring the pressure of the suppressor pressure gauge 7, the continuity of the argon atmosphere in the tundish is ensured, whether it is a process in which the tundish is continuously poured and the molten steel level in the tundish is continuously dropped, or in the initial stage of adding molten steel to the tundish, the molten steel transported by the long water nozzle 12 forms a backflow around the long water nozzle 12, causing the molten steel level to rise. The first suppressor 2 always maintains a slightly positive pressure environment during the pouring process of the long water nozzle 12, preventing external air from entering the first suppressor 2 and causing oxidation of the molten steel, greatly suppressing the slag eyes and slag curls generated in the tundish, and reducing the impact on the flow field of the molten steel, improving the cleanliness of the molten steel, and improving the quality of the continuous casting billet.

[0042] Exemplarily, the tip of the slag-separating cone plate 15 is arranged downward, and a plurality of holes 21 are arranged on the slag-separating cone plate 15, and the material of the slag-separating cone plate 15 is the same as that of the molten steel. In the case of placing the first suppressor 2 for the first time, as the controller 11 controls the first suppressor 2 to be gradually lowered, the tip of the slag-separating cone plate 15 first contacts the molten steel, and then the slag-separating cone plate 15 is gradually immersed in the molten steel, that is, the slag-separating cone plate 15 gradually melts.

[0043] Exemplarily, when the first suppressor 2 is placed for the first time, the first suppressor 2 drives the slag-separating cone plate 15 to descend, and the process is subdivided into a starting stage, an intermediate stage and a stable stage.

[0044] In the initial stage, argon is blown through all the holes 21. Since the slag-separating cone plate 15 is not immersed in the molten steel at this stage, argon is blown through all the holes 21. Under the condition of the same gas supply volume, since the number of holes 21 is the largest, the argon blowing force of a single hole 21 is relatively small and the blown argon is relatively gentle. This arrangement not only realizes the blowing of argon on the covering agent, which reduces the covering agent entering the molten steel when the covering agent is blown away by the argon, but also avoids excessive splashing of the covering agent caused by excessive argon blowing force and oxidation of the molten steel caused by excessive exposed area of ​​the molten steel, thereby increasing the inclusion content.

[0045] In the middle stage, a part of the slag-separating cone plate 15 has been immersed in the molten steel, and the part immersed in the molten steel has melted, then the corresponding melted holes 21 on the slag-separating cone plate 15 can no longer continue to blow argon, and at this time, the remaining holes 21 on the slag-separating cone plate 15 continue to spray argon. Since the number of holes 21 is reduced, but the gas supply has not changed. Therefore, in the middle stage, the force of the holes 21 spraying argon is relatively large, and the force of the argon spraying can still ensure that the covering agent is sprayed and dispersed, and continue to effectively prevent the covering agent from entering the molten steel. And in the middle stage, the argon spraying force is relatively large, which can also prevent external air from entering the space between the first suppressor 2 and the liquid surface of the molten steel, and continue to maintain a slight positive pressure between the first suppressor 2 and the liquid surface of the molten steel, thereby preventing the oxidation of the molten steel.

[0046] In the stable stage, the slag-separating cone plate 15 has been completely melted in the molten steel. At this time, there is argon gas between the first suppressor 2 and the molten steel level, and no matter the tundish is continuously poured or the ladle is initially adding molten steel to the tundish, the first suppressor 2 always rises or falls with the molten steel level, ensuring that the lower edge of the first suppressor 2 is always slightly lower than the slag-metal interface in the tundish, thereby greatly suppressing the slag eyes and slag curls generated in the tundish, reducing the impact on the molten steel flow field, improving the cleanliness of the molten steel, and improving the quality of the continuous casting billet.

[0047] Exemplarily, according to actual needs, the ladle in this embodiment can increase or decrease the flow rate of argon provided by the argon storage container 8, change the argon pressure in the first suppressor 2, and finally realize that the argon blowing pressure of the slag separating cone plate 15 is adjustable, ensuring that the covering agent is blown away to prevent the covering agent from entering the molten steel, and can also always maintain a slight positive pressure between the first suppressor 2 and the liquid surface of the molten steel, thereby preventing the molten steel from oxidation.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0050] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A tundish for preventing slag holes and slag rolls from forming in molten steel, characterized in that: include: Tundish body; A long shroud is arranged above the tundish body; a first suppressor, arranged outside the shroud and connected to the shroud; An argon gas supply assembly is disposed outside the tundish body and is connected to the first suppressor; a lifter, disposed above the first suppressor and connected to an upper wall of the first suppressor; A liquid level sensor is disposed in the tundish body to monitor the liquid level of the molten steel in the tundish body; The controller is arranged on the outside of the intermediate package body and is connected with the argon supply assembly, the liquid level sensor and the lifter.

2. The tundish for preventing slag holes and slag rolls in molten steel according to claim 1, characterized in that: Also includes: The second suppressor is arranged at the bottom of the tundish body.

3. The tundish for preventing slag holes and slag rolls in molten steel according to claim 1, characterized in that: The first suppressor comprises: A first suppressor body is sleeved outside the long shroud; A through hole is provided on the upper wall of the first suppressor body, and the long water port is penetrated through the through hole; A sealing ring, disposed in the through hole; a slag suction plate, arranged on the inner wall of the first suppressor body and detachably connected to the first suppressor body; The slag-separating cone plate is arranged below the first suppressor body and connected to the first suppressor body.

4. The tundish for preventing slag holes and slag rolls in molten steel according to claim 3, characterized in that: The slag suction plate is a honeycomb plate, a lattice concave plate or a corrugated plate.

5. The tundish for preventing slag holes and slag rolls in molten steel according to claim 3, characterized in that: The slag-separating cone plate comprises: Holes are arranged through the slag-separating cone plate.

6. The tundish for preventing slag holes and slag curls in molten steel according to claim 5, characterized in that: The slag-separating cone plate is made of a fusible material, which forms molten steel after melting.

7. The tundish for preventing slag holes and slag rolls in molten steel according to claim 3, characterized in that: The argon gas supply assembly comprises: An argon storage container is arranged outside the tundish body; An argon blowing port is provided above the first suppressor body; A hard gas pipe, arranged on the side of the argon storage container and connected to the argon storage container; A soft air tube, arranged between the hard air tube and the argon blowing port; An argon pressure gauge, disposed on and connected to the hard gas tube; A solenoid valve is disposed adjacent to the argon pressure gauge and connected to the hard gas pipe; An electronic flow meter is arranged adjacent to the solenoid valve and connected to the hard air pipe.

8. A method for operating a tundish to prevent slag holes and slag entanglement in molten steel, applied to the tundish to prevent slag holes and slag entanglement in molten steel as claimed in claim 3, characterized in that: The operation method comprises: S1: putting the first suppressor on the long shroud, and connecting the argon supply assembly to the first suppressor; S2: opening the argon supply assembly, filling the first suppressor with argon, so that the first suppressor is fully filled with argon, and blowing the argon toward the covering agent in the tundish body; S3: When the first suppressor is used for the first time, while the first suppressor is gradually lowered from the long shroud, argon gas is sprayed step by step through the slag-separating conical plates to spray covering agents until the lower edge of the first suppressor is slightly lower than the slag-metal interface in the tundish body; S4: During the continuous pouring stage, the controller monitors the liquid level of the slag-metal interface in the tundish body through the liquid level sensor, and the controller controls the lifter to lift or lower the first suppressor, so that the first suppressor rises or falls synchronously with the slag-metal interface, and the lower edge of the first suppressor is always kept slightly lower than the slag-metal interface in the tundish body; S5: After the pouring is completed, the long nozzle is replaced, and the first suppressor is removed and cleaned.

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