Tundish and control method for continuous casting of different steel grades in tundish

Abstract

The application discloses an intermediate ladle and a method for controlling continuous casting of different steel grades in the intermediate ladle, and relates to the technical field of metallurgical continuous casting. The method improves the problems existing in three methods, i.e., rapid replacement of a ladle, rapid replacement of an intermediate ladle and parking of a continuous casting machine, for casting of different steel grades. The intermediate ladle comprises a ladle body, a long nozzle, a slag dam, a guide dam, an upper nozzle and a movable isolation plate installed on the ladle body. The movable isolation plate is configured to be movable in a first direction and a third direction, so that the movable isolation plate has a first state of shielding a first gap, a second state of partially shielding a second gap, and a third state of being spaced apart from the slag dam and the guide dam and forming a third gap with the bottom of the ladle body in the third direction. Through back-and-forth adjustment of the movable isolation plate between the slag dam and the guide dam, including mutual adjustment of the above states, the mixing time of the first molten steel and the second molten steel can be reduced, the length of a joint billet can be effectively reduced, the metal yield can be improved, the continuous production can be ensured, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical continuous casting, in particular to a tundish and a tundish inner different steel grade continuous casting control method. BACKGROUND

[0002] When facing small batch and different component steel grades, steel enterprises will adopt different steel grade continuous casting. The molten steel with different components will mix with each other in the tundish. The subsequent formed interface billet has large component fluctuation in the length direction, which must be specially managed, and sometimes can only be treated as scrap steel, thereby reducing the metal yield.

[0003] Different steel grade casting mainly adopts three methods of rapid replacement of ladle, rapid replacement of tundish and continuous casting machine parking. However, the replacement of ladle method will reduce the quality of steel grade and produce a large amount of mixed steel; the replacement of tundish method requires higher operation level of plant technicians and will also reduce the service life of tundish; the continuous casting machine parking method will lose a large amount of production time, and sometimes the steel grade needs to be cut, causing yield loss. SUMMARY

[0004] Based on the above problems, the present application provides a tundish and a tundish inner different steel grade continuous casting control method.

[0005] The present application provides a tundish, which comprises a tundish body, a long nozzle and an upper nozzle mounted on the tundish body, and a slag dam and a guide dam arranged in the tundish body, the tundish body has a first direction along the horizontal, a second direction perpendicular to the first direction and along the horizontal, and a third direction perpendicular to the first direction and the second direction, the long nozzle, the slag dam, the guide dam and the upper nozzle are sequentially and spacedly arranged in the first direction, the long nozzle is located at the top of the tundish body, the upper nozzle is located at the bottom of the tundish body, the slag dam arranged along the second direction and the third direction is spaced from the bottom of the tundish body to form a first gap, and the guide dam arranged along the second direction and the third direction is connected with the bottom of the tundish body and spaced from the top of the tundish body to form a second gap; the tundish further comprises a movable isolation plate arranged in the tundish body, the movable isolation plate is arranged between the slag dam and the guide dam in the first direction, the movable isolation plate is arranged along the second direction and the third direction, the size of the movable isolation plate in the third direction is smaller than the size of the tundish body in the third direction, and the movable isolation plate is configured to be movable along the first direction and the third direction, so that the movable isolation plate has a first state of shielding the first gap, a second state of partially shielding the second gap, and a third state of being spaced from the slag dam and the guide dam and forming a third gap with the bottom of the tundish body in the third direction.

[0006] In some embodiments, the movable isolation plate is configured with a driving mechanism, the driving mechanism is arranged outside the tundish body, and the driving mechanism is connected with the movable isolation plate through a connecting piece to drive the movable isolation plate to move along the first direction and the third direction.

[0007] In some embodiments, the shape of the movable partition plate is the same as the sectional shape of the inner cavity of the ladle along the second direction and the third direction.

[0008] In some embodiments, the size of the first gap in the third direction is smaller than the size of the flow guide dam.

[0009] In some embodiments, the slag dam is spaced apart from the flow guide dam by a first length in the first direction; when the movable partition plate is in the third state, the spacing between the movable partition plate and the slag dam in the first direction is 50% to 70% of the first length.

[0010] In some embodiments, when the movable partition plate is in the third state, the spacing between the movable partition plate and the bottom of the ladle is smaller than the size of the first gap in the third direction, the size of the flow guide dam in the third direction.

[0011] A method for controlling continuous casting of different steel grades in a tundish, using the tundish described above, the method comprising:

[0012] The long nozzle inputs the first molten steel, and the movable partition plate is in the third state, and the upper nozzle outputs the first molten steel;

[0013] Before the long nozzle switches to input the second molten steel, the movable partition plate is adjusted from the third state to the first state;

[0014] After the movable partition plate is adjusted to the first state, the long nozzle switches to input the second molten steel, and the long nozzle continues to input the second molten steel, and the liquid level below the long nozzle rises, and the upper nozzle continues to output the first molten steel;

[0015] Under the condition that the liquid level below the long nozzle rises to a first preset value, the movable partition plate moves along the first direction towards the flow guide dam without leaving the bottom of the ladle, until the movable partition plate is adjusted to the second state;

[0016] After the movable partition plate is adjusted to the second state, the movable partition plate is adjusted to the third state again until the upper nozzle outputs the second molten steel.

[0017] In some embodiments, during the adjustment of the movable partition plate from the second state to the third state, the movable partition plate first moves along the third direction and then moves along the first direction.

[0018] In some embodiments, during the adjustment of the movable partition plate from the first state to the second state, the movable partition plate moves at a constant speed along the first direction.

[0019] In some embodiments, when the long nozzle inputs the first molten steel, and the movable partition plate is in the third state, and the upper nozzle outputs the first molten steel, it comprises:

[0020] Adjust the movable isolation plate to the first state, the long nozzle starts to input the first kind of liquid steel to the ladle, the liquid level below the long nozzle rises;

[0021] After the liquid level below the long nozzle rises to the first preset value, the movable isolation plate is moved along the first direction towards the diversion dam on the basis of not leaving the bottom of the ladle until the movable isolation plate is adjusted to the second state;

[0022] After the movable isolation plate is adjusted to the second state, the liquid level between the slag dam and the movable isolation plate rises;

[0023] After the liquid level between the slag dam and the movable isolation plate rises to the second preset value, the movable isolation plate is adjusted from the second state to the third state, and the upper nozzle can output the first kind of liquid steel.

[0024] The application has the following beneficial effects: a tundish is provided, which comprises a ladle, a long nozzle, a slag dam, a diversion dam, an upper nozzle and a movable isolation plate installed on the ladle, the movable isolation plate is configured to be movable along a first direction and a third direction, so that the movable isolation plate has a first state of shielding a first gap, a second state of partially shielding a second gap, and a third state of being spaced apart from the slag dam and the diversion dam and forming a third gap with the bottom of the ladle in the third direction; by adjusting the movable isolation plate back and forth between the slag dam and the diversion dam, including mutual adjustment of the above-mentioned states, the mixing time of the first kind of liquid steel and the second kind of liquid steel can be reduced, the length of the joint billet can be effectively reduced, the metal yield can be improved, the continuous production can be ensured, and the production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description only some embodiments of the present application.

[0026] Figure 1 A front view of the tundish of the present application is shown;

[0027] Figure 2 A top view of the tundish of the present application is shown;

[0028] Figure 3 A side view of part of the structure of the tundish of the present application is shown;

[0029] Figure 4 A schematic diagram of the tundish of the present application with a driving mechanism is shown;

[0030] Figure 5 A schematic diagram of the movable isolation plate of the present application in the first state is shown;

[0031] Figure 6A schematic diagram showing the movable isolation plate of the present application in a second state is shown;

[0032] Figure 7 A schematic diagram showing the movable isolation plate of the present application in a third state is shown;

[0033] Figure 8 A schematic diagram showing the general flow of the intermediate ladle in the present embodiment is shown.

[0034] The accompanying drawings are as follows: 100 - ladle body, 110 - first direction, 120 - second direction, 130 - third direction, 200 - long nozzle, 300 - upper nozzle, 400 - slag dam, 410 - first gap, 420 - first length, 500 - guide dam, 510 - second gap, 600 - movable isolation plate, 610 - third gap, 700 - driving mechanism. DETAILED DESCRIPTION

[0035] The present embodiment provides an intermediate ladle and an intermediate ladle in-steel continuous casting control method, which improves the technical problems of producing a large amount of mixed steel or requiring high operation or losing a large amount of production time in the three methods of fast changing the ladle, fast changing the intermediate ladle and stopping the continuous casting machine in the related art.

[0036] The technical solution in the present embodiment is to solve the above technical problems, and the general idea is as follows:

[0037] An intermediate ladle includes a ladle body, a long nozzle and an upper nozzle mounted on the ladle body, and a slag dam and a guide dam arranged in the ladle body, the ladle body has a first direction along the horizontal, a second direction perpendicular to the first direction and along the horizontal, and a third direction perpendicular to the first direction and the second direction, the long nozzle, the slag dam, the guide dam and the upper nozzle are sequentially and spaced apart in the first direction, the long nozzle is located at the top of the ladle body, the upper nozzle is located at the bottom of the ladle body, the slag dam arranged along the second direction and the third direction is spaced apart from the bottom of the ladle body to form a first gap, and the guide dam arranged along the second direction and the third direction is connected to the bottom of the ladle body and spaced apart from the top of the ladle body to form a second gap; the intermediate ladle further includes a movable isolation plate arranged in the ladle body, the movable isolation plate is arranged between the slag dam and the guide dam in the first direction, the movable isolation plate is arranged along the second direction and the third direction, the size of the movable isolation plate in the third direction is smaller than the size of the ladle body in the third direction, and the movable isolation plate is configured to move along the first direction and the third direction, so that the movable isolation plate has a first state of shielding the first gap, a second state of partially shielding the second gap, and a third state of being spaced apart from the slag dam and the guide dam and forming a third gap with the bottom of the ladle body in the third direction.

[0038] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings and specific embodiments of the present application.

[0039] Embodiment 1

[0040] Referring to Figures 1 to 4 , the embodiment discloses a tundish, comprising a tundish body 100, a long nozzle 200, a slag dam 400, a guide dam 500, an upper nozzle 300 and a movable partition plate 600 installed on the tundish body 100.

[0041] As shown in Figure 1 , the tundish body 100 has a first direction 110 along the horizontal, a second direction 120 perpendicular to the first direction 110 and along the horizontal, and a third direction 130 perpendicular to both the first direction 110 and the second direction 120. In the working state, the third direction 130 is the height direction.

[0042] Referring to Figure 1 , the long nozzle 200 and the upper nozzle 300 are installed on the tundish body 100, and the slag dam 400 and the guide dam 500 are arranged in the tundish body 100. The long nozzle 200, the slag dam 400, the guide dam 500 and the upper nozzle 300 are sequentially and spacedly arranged in the first direction 110. The long nozzle 200 is located at the top of the tundish body 100, the upper nozzle 300 is located at the bottom of the tundish body 100, the slag dam 400 arranged along the second direction 120 and the third direction 130 is spaced from the bottom of the tundish body 100 to form a first gap 410, and the guide dam 500 arranged along the second direction 120 and the third direction 130 is connected with the bottom of the tundish body 100 and spaced from the top of the tundish body 100 to form a second gap 510.

[0043] Referring to Figures 1 to 4 , the movable partition plate 600 is movably arranged in the tundish body 100. In the first direction 110, the movable partition plate 600 is arranged between the slag dam 400 and the guide dam 500. The movable partition plate 600 is arranged along the second direction 120 and the third direction 130. The size of the movable partition plate 600 in the third direction 130 is smaller than the size of the tundish body 100 in the third direction 130. The movable partition plate 600 is configured to move along the first direction 110 and the third direction 130, so that the movable partition plate 600 has a first state of shielding the first gap 410 as shown in Figure 5 , the movable partition plate 600 has a second state of partially shielding the second gap 510 as shown in Figure 6 , and the movable partition plate 600 has a third state of being spaced from the slag dam 400 and the guide dam 500 and forming a third gap 610 with the bottom of the tundish body 100 in the third direction 130 as shown in Figure 7 .

[0044] In the different steel grade casting, the two steel liquids are called first steel liquid and second steel liquid, and the working process of the tundish in the embodiment includes: the long nozzle 200 inputs the first steel liquid, the movable isolation plate 600 is in the third state, and the upper nozzle 300 outputs the first steel liquid; before the long nozzle 200 switches to input the second steel liquid, the movable isolation plate 600 is adjusted from the third state to the first state; after the movable isolation plate 600 is adjusted to the first state, the long nozzle 200 switches to input the second steel liquid, the long nozzle 200 continuously inputs the second steel liquid, the liquid level below the long nozzle 200 rises, and the upper nozzle 300 continuously outputs the first steel liquid; under the condition that the liquid level below the long nozzle 200 rises to the first preset value, the movable isolation plate 600 moves along the first direction 110 towards the flow guide dam 500 on the basis of not leaving the bottom of the tundish 100 until the movable isolation plate 600 is adjusted to the second state; after the movable isolation plate 600 is adjusted to the second state, the movable isolation plate 600 is adjusted to the third state again until the upper nozzle 300 outputs the second steel liquid.

[0045] In the first aspect, in the process of the movable isolation plate 600 moving along the first direction 110 towards the flow guide dam 500 from the first state to the second state, the plate bottom of the movable isolation plate 600 is limited to not leaving the bottom of the tundish 100, which can continue to push part of the pure first steel liquid forward, so that the part of the first steel liquid can smoothly flow into the next process from the upper nozzle 300, and the length of the interface billet can be reduced, thereby improving the metal yield.

[0046] In the second aspect, when the long nozzle 200 switches from inputting the first steel liquid to inputting the second steel liquid, the movable isolation plate 600 is in the first state, compared with all the inner cavities of the tundish 100, the movable isolation plate 600 will shield the first gap 410, so that the space range of the second steel liquid in the tundish is reduced at this stage, which reduces the total volume of the mixture of the second steel liquid and the first steel liquid, and can improve the metal yield.

[0047] In the third aspect, after the above inputting the second steel liquid and the movable isolation plate 600 being in the first state, as the movable isolation plate 600 is adjusted to the second state and the third state in turn, the mixed liquid of the first steel liquid and the second steel liquid can be transported away from the upper nozzle 300 as soon as possible, which guarantees the purity of the subsequent second steel liquid and is also beneficial to reducing the interface billet.

[0048] In the fourth aspect, when the movable isolation plate 600 is in the third state, please refer to Figure 7 When the steel liquid flows through the movable isolation plate 600, a backflow area is formed on both sides of the movable isolation plate 600, so that part of the steel liquid has an upward movement tendency and flows towards the upper surface of the tundish, thereby increasing the movement path of the steel liquid and improving the floating removal probability of the inclusions.

[0049] In the fifth aspect, when the long nozzle 200 starts to input the first molten steel, the movable isolation plate 600 is initially in the first state, and the space range is limited so that the molten steel accumulates in the buffer zone below the long nozzle 200, the long-time and large-area contact between the molten steel and the air is reduced, and the secondary oxidation of the molten steel is prevented.

[0050] In summary, when the tundish in the embodiment is applied, the back-and-forth adjustment of the movable isolation plate 600 between the slag dam 400 and the diversion dam 500, including the mutual adjustment of the above-mentioned states, can not only shorten the mixing time of continuous casting of different steel grades, but also prevent the secondary oxidation of the molten steel, promote the floating and removal of inclusions in the molten steel, reduce the length of the joint billet, improve the metal yield, and reduce the production cost.

[0051] In some embodiments, referring to Figure 3 , the shape of the movable isolation plate 600 is the same as the cross-sectional shape of the inner cavity of the ladle body 100 along the second direction 120 and the third direction 130, so that the movable isolation plate 600 can block the inner cavity section of the ladle body 100 as much as possible.

[0052] In some embodiments, the size of the first gap 410 in the third direction 130 is smaller than the size of the diversion dam 500, and in actual application, the molten steel can flow along the arrow path shown in Figure 7 .

[0053] In some embodiments, the slag dam 400 and the diversion dam 500 are apart from each other by a first length 420 in the first direction 110; when the movable isolation plate 600 is in the third state, the distance between the movable isolation plate 600 and the slag dam 400 in the first direction 110 is 50% to 70% of the first length 420, including 50%, 54%, 58%, 62%, 64%, 68%, 70%, and preferably 61%. When the movable isolation plate 600 is in the third state, the effect of floating and removing inclusions is better.

[0054] In some embodiments, when the movable isolation plate 600 is in the third state, the distance between the movable isolation plate 600 and the bottom of the ladle body 100 is smaller than the size of the first gap 410 in the third direction 130 and the size of the diversion dam 500 in the third direction 130, which further enhances the effect of floating and removing inclusions.

[0055] Embodiment 2

[0056] Based on the tundish of embodiment 1, the movable isolation plate 600 is further limited in this embodiment, and referring to Figure 4 , the movable isolation plate 600 is provided with a driving mechanism 700, the driving mechanism 700 is arranged outside the ladle body 100, and the driving mechanism 700 is connected with the movable isolation plate 600 through a connecting piece to drive the movable isolation plate 600 to move along the first direction 110 and the third direction 130.

[0057] Please refer to Figure 4 In some embodiments, the drive mechanism 700 includes a combination of vertical guide rails, horizontal guide rails, etc. One end of the connector is connected to the movable isolation plate 600, and the other end of the connector is connected to the guide rail. The movable isolation plate 600 can be controlled to move in the first direction 110 and the third direction 130 by moving the guide rail.

[0058] For example, a vertical guide rail is installed on the control vehicle, a horizontal guide rail is installed on the vertical guide rail, and the horizontal guide rail is connected to the movable isolation plate 600 through a connector. The above functions are achieved by the control vehicle moving along the first direction 110 and the horizontal guide rail moving in the third direction 130.

[0059] Example 3

[0060] Based on the tundish of Embodiment 1 or Embodiment 2, this embodiment discloses a method for controlling the continuous casting of different steel grades in the tundish, which can be referred to... Figure 8 The methods include:

[0061] The first type of molten steel is input into the long nozzle 200, such as... Figure 4 As shown, the movable isolation plate 600 is in the third state, and the water inlet 300 outputs the first type of molten steel;

[0062] Before switching the inlet 200 to input the second type of molten steel, the movable isolation plate 600 is adjusted from the third state to the first state, corresponding to... Figure 4 Adjust to Figure 5 The state shown;

[0063] like Figure 5 As shown, after the movable isolation plate 600 is adjusted to the first state, the long nozzle 200 switches to inputting the second type of molten steel. The long nozzle 200 continuously inputs the second type of molten steel, the liquid level below the long nozzle 200 rises, and the upper nozzle 300 continuously outputs the first type of molten steel.

[0064] When the liquid level below the long inlet 200 rises to the first preset value, the movable isolation plate 600 moves along the first direction 110 toward the guide dam 500 without detaching from the bottom of the package 100, until the movable isolation plate 600 is adjusted to the second state, corresponding to the... Figure 5 Adjust to Figure 6 The state shown;

[0065] After the movable isolation plate 600 is adjusted to the second state, it is then adjusted to the third state, corresponding to the... Figure 6 Adjust to Figure 7 The state shown continues until the second type of molten steel is output from the water inlet 300.

[0066] In the first aspect, in the process of moving the movable isolation plate 600 from the first state to the second state, the movable isolation plate 600 moves along the first direction 110 towards the flow guide dam 500, which limits the plate bottom of the movable isolation plate 600 from being separated from the bottom of the tundish 100, and can continue to push part of the pure first molten steel forward, so that the part of the first molten steel can smoothly flow into the next process from the upper nozzle 300, and the metal yield can be improved.

[0067] In the second aspect, when the long nozzle 200 switches from inputting the first molten steel to inputting the second molten steel, the movable isolation plate 600 is in the first state, and compared with all the inner cavities of the tundish 100, the movable isolation plate 600 will shield the first gap 410, so that the space range of the second molten steel in the tundish during this stage is reduced, the total volume of the mixture of the first molten steel and the second molten steel is reduced, and the metal yield can be improved.

[0068] In the third aspect, after the above-mentioned input of the second molten steel and the movable isolation plate 600 is in the first state, as the movable isolation plate 600 is adjusted to the second state and the third state in turn, the mixed liquid of the first molten steel and the second molten steel can be transported away from the upper nozzle 300 as soon as possible, the purity of the subsequent second molten steel is ensured, and it is also beneficial to reduce the transfer billet.

[0069] In some embodiments, in the process of adjusting the movable isolation plate 600 from the second state to the third state, the movable isolation plate 600 moves along the third direction 130 first and then moves along the first direction 110, that is, it first rises and then moves along the first direction 110, which can further improve the metal yield.

[0070] In some embodiments, in the process of adjusting the movable isolation plate 600 from the first state to the second state, the movable isolation plate 600 moves uniformly along the first direction 110.

[0071] Embodiment 4

[0072] Based on the intermediate ladle inside different steel grade continuous casting control method provided in Embodiment 3, the present embodiment further limits the "long nozzle 200 inputs the first molten steel, the movable isolation plate 600 is in the third state, and the upper nozzle 300 outputs the first molten steel". Specifically, it includes:

[0073] Adjust the movable isolation plate 600 to the first state, the long nozzle 200 starts to input the first molten steel into the tundish 100, and the liquid level below the long nozzle 200 rises;

[0074] After the liquid level below the long nozzle 200 rises to the first preset value, the movable isolation plate 600 moves along the first direction 110 towards the flow guide dam 500 without being separated from the bottom of the tundish 100, until the movable isolation plate 600 is adjusted to the second state;

[0075] After the movable partition plate 600 is adjusted to the second state, the liquid level between the weir 400 and the movable partition plate 600 rises;

[0076] After the liquid level between the weir 400 and the movable partition plate 600 rises to the second preset value, the movable partition plate 600 is adjusted from the second state to the third state, and the upper water gap 300 can output the first molten steel.

[0077] In the above steps, when the long nozzle 200 starts to input the first molten steel, the movable partition plate 600 is initially in the first state, and by limiting the space range, the molten steel is accumulated in the buffer zone below the long nozzle 200, reducing the long-time and large-area contact between the molten steel and the air, and preventing the molten steel from being re-oxidized.

[0078] Embodiment 5

[0079] Based on the intermediate ladle in Embodiment 1, the intermediate ladle in Embodiment 2, the intermediate ladle in Embodiment 3, or the intermediate ladle in Embodiment 4, this embodiment provides some intermediate ladle schemes with specific parameters.

[0080] Specifically, the first gap 410 is 250 mm, the thickness of the weir 400 is 120 mm, the height of the movable partition plate 600 is 900 mm, the thickness of the movable partition plate 600 is 100 mm, the height of the guide dam 500 is 310 mm, the thickness of the guide dam 500 is 100 mm, the first length 420 is 1541 mm, the distance between the movable partition plate 600 in the third state and the weir 400 is 940 mm, and the distance between the movable partition plate 600 in the third state and the bottom of the ladle body 100 is 190 mm.

[0081] In some embodiments, the first preset value is 800 mm when the movable partition plate 600 is in the first state; after the movable partition plate 600 is adjusted to the second state, the movable partition plate 600 is lifted when the liquid level between the weir 400 and the movable partition plate 600 rises to 800 mm, and the movable partition plate 600 is moved towards the weir 400 when the liquid level between the weir 400 and the movable partition plate 600 rises to 850 mm.

[0082] In some embodiments, the movable partition plate 600 moves at a constant speed of 0.08 m / s along the first direction 110.

[0083] In some embodiments, before the second molten steel is input, the liquid level of the molten steel in the ladle body 100 is lowered, for example, to 350 mm, the movable partition plate 600 is moved towards the weir 400, and adjusted to the first state to prepare for inputting the second molten steel through the long nozzle 200.

[0084] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure without departing from the spirit and scope of the application. Accordingly, it is intended that the appended claims include all such modifications and variations as fall within the scope of the present application.

[0085] It is apparent that those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. It is therefore intended that the present application cover all such changes and modifications that are within its scope.

Claims

1. A tundish, characterized by, The tundish comprises a body, a long nozzle and an upper nozzle mounted on the body, and a slag dam and a guide dam arranged in the body, the body has a first direction along the horizontal, a second direction perpendicular to the first direction and along the horizontal, and a third direction perpendicular to the first direction and the second direction, the long nozzle, the slag dam, the guide dam and the upper nozzle are sequentially and spaced apart in the first direction, the long nozzle is located at the top of the body, the upper nozzle is located at the bottom of the body, the slag dam and the guide dam arranged along the second direction and the third direction are spaced apart from the bottom of the body to form a first gap, the guide dam arranged along the second direction and the third direction is connected with the bottom of the body and spaced apart from the top of the body to form a second gap; The tundish further comprises a movable isolation plate arranged in the body, the movable isolation plate is arranged between the slag dam and the guide dam in the first direction, the movable isolation plate is arranged along the second direction and the third direction, the size of the movable isolation plate in the third direction is smaller than the size of the body in the third direction, and the movable isolation plate is configured to be movable along the first direction and the third direction, so that the movable isolation plate has a first state of shielding the first gap, a second state of partially shielding the second gap, and a third state of being spaced apart from the slag dam and the guide dam and forming a third gap with the bottom of the body in the third direction.

2. The tundish according to claim 1, characterized in that The movable isolation plate is provided with a driving mechanism, the driving mechanism is arranged outside the body, and the driving mechanism is connected with the movable isolation plate through a connecting piece to drive the movable isolation plate to move along the first direction and the third direction.

3. The tundish according to claim 1, characterized in that The shape of the movable isolation plate is the same as the sectional shape of the inner cavity of the body along the second direction and the third direction.

4. The tundish according to claim 1, characterized in that The size of the first gap in the third direction is smaller than the size of the guide dam.

5. The tundish according to claim 1, characterized in that The slag dam and the guide dam are spaced apart by a first length in the first direction; when the movable isolation plate is in the third state, the distance between the movable isolation plate and the slag dam in the first direction is 50% to 70% of the first length.

6. The tundish according to claim 1, characterized in that When the movable isolation plate is in the third state, the distance between the movable isolation plate and the bottom of the body is smaller than the size of the first gap in the third direction and the size of the guide dam in the third direction.

7. A method for controlling intermediate ladle continuous casting of different steel grades, characterized by, The method comprises: The long nozzle inputs the first molten steel, the movable isolation plate is in the third state, and the upper nozzle outputs the first molten steel; Before the long nozzle switches to input the second molten steel, the movable isolation plate is adjusted from the third state to the first state; After the movable isolation plate is adjusted to the first state, the long nozzle switches to input the second molten steel, the long nozzle continuously inputs the second molten steel, the liquid level below the long nozzle rises, and the upper nozzle continuously outputs the first molten steel; Under the condition that the liquid level below the long nozzle rises to a first preset value, the movable isolation plate moves along the first direction towards the flow guide dam without leaving the bottom of the ladle body until the movable isolation plate is adjusted to the second state; After the movable isolation plate is adjusted to the second state, the movable isolation plate is adjusted to the third state until the upper nozzle outputs the second molten steel.

8. The method of controlling the continuous casting of different steel grades in a tundish according to claim 7, wherein In the process of adjusting the movable isolation plate from the second state to the third state, the movable isolation plate moves along the third direction first and then moves along the first direction.

9. The method of controlling the continuous casting of different steel grades in a tundish according to claim 7, wherein In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction.

10. The method of controlling the continuous casting of different steel grades in a tundish according to claim 7, wherein In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the process of adjusting the movable isolation plate from the first state to the second state, the movable isolation plate moves at a constant speed along the first direction. In the

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