Tundish dam structure

Abstract

The utility model discloses a tundish dam structure, belongs to the technical field of casting, and solves the problem that the short-circuit flow of a near-end collector nozzle is difficult to improve in the conventional continuous casting tundish. The device comprises a U-shaped turbulence suppressor and two retaining dams, the U-shaped turbulence suppressor is located in a tundish on one side of a liquid inlet, the U-shaped turbulence suppressor comprises a transverse retaining wall and two side retaining walls, one ends of the two side retaining walls are connected with the inner wall of the tundish respectively, the other ends of the two side retaining walls are connected with the two ends of the transverse retaining wall respectively, and the two retaining dams are connected with the two ends of the transverse retaining wall respectively. Flow guide holes are formed in the transverse retaining wall and the side retaining wall, and a separation channel is arranged between the transverse retaining wall and the side wall of the tundish; the height of the retaining dams is smaller than that of the tundish, the two retaining dams are installed between the two drainage ports at the near end and the U-shaped turbulence suppressor respectively, and each retaining dam is provided with a through hole. According to the tundish dam structure, the uniformity of four flows can be improved, the flowing dead zone of molten steel is reduced, and the situation of short-circuit flow of the molten steel close to a collector nozzle is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, and more particularly to a tundish retaining dam structure. Background Art

[0002] Tundish casting is the middle link in the steelmaking process and the transition point from intermittent operation to continuous operation. It is an important link to improve steel production and quality. Whether it is for the smooth operation of continuous casting or for ensuring the quality of steel billets, the role of the tundish cannot be ignored. Traditional tundish, such as Figure 1 As shown in the figure, after the molten steel enters from the liquid inlet a, it will flow directly to the drain port b. Due to the short-circuit flow between the two drain ports b at the proximal end, the residence time of the molten steel is short, which will lead to inclusions and incomplete floating of the slag under the ladle. In addition, there is a difference in the residence time of the two streams of molten steel corresponding to the proximal drain port and the two streams of molten steel corresponding to the distal drain port, which will lead to inconsistent quality of the ingot.

[0003] like Figure 2 As shown in Figure 1, some existing tundishes use a Y-shaped turbulence suppressor (c) to block the molten steel. The molten steel is then diverted from the impact zone to the nozzle area through diversion holes (d) provided on the Y-shaped turbulence suppressor. However, in actual application, the Y-shaped turbulence suppressor has not been able to solve the problem of short-circuiting flow near the nozzle.

[0004] Therefore, it is urgent to develop and design a new type of tundish dam structure. Utility Model Content

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. The purpose of the present invention is to provide a tundish dam structure that can improve the uniformity of the four flows, reduce the dead zone of molten steel flow, and improve the short-circuit flow of molten steel near the downspout.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a tundish dam structure, including a U-shaped turbulence suppressor and two dams, the U-shaped turbulence suppressor is located in the tundish on the side of the liquid inlet, the U-shaped turbulence suppressor includes a transverse baffle and two side baffles, one end of the two side baffles is respectively connected to the inner wall of the tundish, and the other end is respectively connected to the two ends of the transverse baffle, the transverse baffle and the side baffle are both provided with diversion holes, and there is a partition between the transverse baffle and the side wall of the tundish; the height of the dam is less than the height of the tundish, and the two dams are respectively installed between the two water outlets at the proximal end and the U-shaped turbulence suppressor, and each of the dams is provided with a through hole.

[0007] As a further improvement, the angle between the side retaining wall and the transverse retaining wall is an obtuse angle.

[0008] Furthermore, there are four diversion holes in total, one diversion hole is correspondingly provided on each of the side retaining walls, and two diversion holes are correspondingly provided on the transverse retaining wall.

[0009] Furthermore, each of the dams has two through holes, and the two through holes are respectively opened at one end of the dam close to the side wall of the tundish.

[0010] Furthermore, the through hole is an inclined hole, and the axis of the through hole gradually rises along the flow direction of the molten steel.

[0011] Furthermore, the distance between the dam and the proximal drain outlet is 200-250 mm.

[0012] Furthermore, the height of the dam is 200-250 mm, and the height of the diversion hole is greater than the height of the dam.

[0013] Furthermore, the retaining dam is connected to the tundish through a knotted material.

[0014] Furthermore, V-shaped clamping plates are embedded in both side walls of the tundish, both ends of the dam are respectively clamped in the two V-shaped clamping plates, and the knotted material is filled in the V-shaped clamping plates.

[0015] Furthermore, the shapes of the end faces at both ends of the dam are adapted to the shapes of the two side walls of the tundish.

[0016] Beneficial effects

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The tundish dam structure of the utility model prolongs the residence time of the molten steel in the tundish and increases the probability of the slag floating up under the ladle by arranging a U-shaped turbulence suppressor and a dam in the tundish, and can improve the uniformity of the four flows (four water outlets), so that the quality of the ingots is uniform, and there will not be large differences in the temperature and cleanliness of the molten steel. At the same time, the flow of the molten steel in the far corner is accelerated, the dead zone of the molten steel flow is reduced, and the short-circuit flow of the molten steel at the near-end water outlet is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of a tundish structure using traditional technology;

[0020] Figure 2 A schematic diagram of another tundish structure in the prior art;

[0021] Figure 3 This is a schematic diagram of the structure of the tundish of the present utility model;

[0022] Figure 4 for Figure 3 A schematic diagram of the structure at center A;

[0023] Figure 5 This is an enlarged schematic diagram of the three-dimensional structure of the U-shaped turbulence suppressor in the present invention;

[0024] Figure 6 It is an enlarged schematic diagram of the three-dimensional structure of the retaining dam in the present utility model;

[0025] Figure 7 It is an enlarged schematic diagram of the cross-sectional structure of the retaining dam in the present utility model;

[0026] Figure 8 It is a stagnation time simulation working condition diagram of the solutions corresponding to the traditional technology, the existing technology and the present utility model;

[0027] Figure 9 Peak time simulation working condition diagram of the conventional technology, existing technology and the corresponding solutions of the utility model;

[0028] Figure 10 The actual average residence time simulation working condition diagram of the conventional technology, the existing technology and the corresponding scheme of the utility model;

[0029] Figure 11 This is a diagram of the tundish flow simulation working conditions for the corresponding solutions of the traditional technology, the existing technology and the present utility model.

[0030] Among them: 1-U-shaped turbulence suppressor, 2-dam, 3-tundish, 4-cross retaining wall, 5-side retaining wall, 6-diversion hole, 7-partition, 8-through hole, 9-knotting material, 10-V-shaped splint, a-liquid inlet, b-water outlet, c-Y-shaped turbulence suppressor. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0032] See Figure 3-7The utility model provides a tundish dam structure, including a U-shaped turbulence suppressor 1 and two dams 2, wherein the U-shaped turbulence suppressor 1 is located in the tundish 3 on the side of the liquid inlet a, and the U-shaped turbulence suppressor 1 includes a transverse baffle 4 and two side baffles 5, wherein one end of the two side baffles 5 is respectively connected to the inner wall of the tundish 3, and the other end is respectively connected to the two ends of the transverse baffle 4. Specifically, the side baffles 5 and the tundish 3 can be installed and connected in a buried manner, so that a relatively closed buffer zone is formed between the U-shaped turbulence suppressor 1 and the tundish 3 for buffering the molten steel. Diversion holes 6 are provided on the transverse baffle 4 and the side baffle 5, so that the molten steel can flow into the tundish 3 from different directions. There is a partition 7 between the transverse baffle 4 and the side wall of the tundish 3. The setting of the partition 7 can increase the connection between the dam 3 and the U-shaped turbulence suppressor 1. The volume between the suppressors 1 can further slow down the flow, and at the same time, it also keeps a distance between the U-shaped turbulence suppressor 1 and the side wall of the ladle 3, so that the molten steel can flow out from multiple directions. Compared with the structure of the Y-shaped turbulence suppressor c, the flow direction of the molten steel is more diversified; the height of the dam 2 is less than the height of the ladle 3, and the molten steel can overflow from the top of the dam 2, and then flow to the four water outlets b for steel production, and the two dams 2 are respectively installed between the two water outlets b at the proximal end and the U-shaped turbulence suppressor 1. The dam 2 can further block the molten steel and flow to the water outlet b by overflow, thereby achieving the effect of further slowing down the flow. Each dam 2 is provided with a through hole 8, and the molten steel can pass through the through hole 8 at a small flow rate to prevent the molten steel from staying between the U-shaped turbulence suppressor 1 and the dam 2 for too long.

[0033] Preferably, the angle between the side retaining wall 5 and the transverse retaining wall 4 is an obtuse angle, so that the flow directions of the guide holes 6 corresponding to the side retaining wall 5 and the transverse retaining wall 4 are at an angle and face the same side wall of the ladle 3, so that the molten steel can better converge into the space between the retaining dam 2 and the U-shaped turbulence suppressor 1.

[0034] Preferably, there are four guide holes 6, one guide hole 6 is correspondingly provided on each side retaining wall 5, and two guide holes 6 are correspondingly provided on the transverse retaining wall 4. The positions of the guide holes 6 are reasonably distributed so that the molten steel flows smoothly.

[0035] Preferably, there are two through holes 8 on each dam 2, and the two through holes 8 are respectively opened at one end of the dam 2 near the side wall of the ladle 3, which can further reduce the dead zone of molten steel flow between the dam 2 and the ladle 3. Furthermore, the through hole 8 is an inclined hole, and the axis of the through hole 8 gradually rises along the flow direction of the molten steel, that is, the distal end is high and the proximal end is low, so that the molten steel flows out of the dam 2 upward, further playing a role in slowing down the flow. Furthermore, the distance between the dam 2 and the proximal water outlet b is 200-250mm. Reasonable optimization of the position of the dam 2 can play a better role in slowing down the flow. In this embodiment, the distance between the dam 2 and the proximal water outlet b can be 220mm. Furthermore, the height of the dam 2 is 200-250mm, and the height of the guide hole 6 is greater than the height of the dam 2. Reasonable optimization of the height of the dam 2 ensures that the molten steel can overflow to the positions corresponding to the four water outlets b.

[0036] Preferably, the dam 2 is connected to the tundish 3 through a knotting material 9. The knotting material 9 is a product in the prior art and will not be described in detail here, so as to achieve the sealing and fixation of the dam 2. Furthermore, V-shaped splints 10 are embedded in the two side walls of the tundish 3, and the two ends of the dam 2 are respectively clamped in the two V-shaped splints 10, and the knotting material 9 is filled in the V-shaped splints 10. In this embodiment, the V-shaped splints 10 are used to limit the dam 2 to prevent it from tilting, thereby further improving the stability of the installation of the dam 2. Furthermore, the shape of the end faces of the dam 2 at both ends is adapted to the shape of the two side walls of the tundish 3, which facilitates the installation of the dam 2 and facilitates the sealing and fixation of the dam 2 by the knotting material 9.

[0037] The tundish retaining dam structure in this embodiment includes a U-shaped turbulence suppressor 1 and a retaining dam 2 in front of the proximal outlet. The operating conditions of a four-stream tundish are simulated as follows:

[0038] like Figure 3 As shown, the four drain ports of the tundish are marked separately: the two drain ports b at the proximal end are marked as 2# and 3#, and the two drain ports b at the distal end are marked as 1# and 4#.

[0039] Part of the molten steel is marked near the tundish's molten steel inlet (liquid inlet a) and detected at the outlet (outlet b). This allows the outflow time to be determined and the flow conditions to be evaluated:

[0040] like Figure 8 As shown, from the perspective of stagnation time (the time when the outlet first detects the marked molten steel), the stagnation time of Scheme 2, 2# and 3# in this implementation is significantly higher than that of the traditional technology, indicating that the short-circuit flow of 2# and 3# has been improved. However, in Scheme 1 corresponding to the existing Y-shaped turbulence suppressor, the stagnation time is not ideal.

[0041] like Figure 9As shown, from the peak time (the time when the marked molten steel flows out most concentratedly), the peak time of scheme 2, 2# and 3# in this embodiment is improved compared with the traditional technology, but the peak time of scheme 1# and 4# is reduced.

[0042] like Figure 10 As shown in the figure, from the actual average residence time (the average time for the marked molten steel to flow out of the drain), although the residence time of Scheme 2, 1# and 4# in this implementation is reduced, the short-circuit flow of molten steel in 2# and 3# is greatly improved, while Scheme 1 corresponding to the existing Y-shaped turbulence suppressor fails to solve the problem of short-circuit flow at the proximal drain.

[0043] In the scheme 2 of this implementation, the actual average residence time of the four outlets 1#, 2#, 3# and 4# is similar, indicating that the four streams flow evenly, the quality of the ingot is uniform, and there will not be significant differences in the temperature and cleanliness of the molten steel.

[0044] like Figure 11 As shown, from the perspective of the flow state in the tundish, both the Y-shaped turbulence suppressor (Scheme 1) and the present embodiment (Scheme 2) can reduce the dead zone, and the present embodiment (Scheme 2) is particularly obvious, mainly because it speeds up the flow of molten steel in the far corner.

[0045] After simulating and analyzing three working conditions of traditional technology, existing technology and this technical solution, it can be seen that the tundish dam structure of the utility model prolongs the residence time of the molten steel in the tundish by arranging a U-shaped turbulence suppressor and a dam in the tundish, increases the probability of the slag floating up under the ladle, can improve the uniformity of the four flows (four water outlets), make the quality of the ingot uniform, and there will not be large differences in the temperature and cleanliness of the molten steel. At the same time, it accelerates the flow of molten steel in the far corner, reduces the dead zone of molten steel flow, and improves the short-circuit flow of molten steel at the near-end water outlet.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These modifications and improvements will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A tundish dam structure, characterized in that: The invention comprises a U-shaped turbulence suppressor (1) and two dams (2), wherein the U-shaped turbulence suppressor (1) is located in a tundish (3) on one side of a liquid inlet (a), and the U-shaped turbulence suppressor (1) comprises a transverse baffle (4) and two side baffles (5), one end of each of the two side baffles (5) is connected to the inner wall of the tundish (3), and the other end is connected to the two ends of the transverse baffle (4), both the transverse baffle (4) and the side baffle (5) are provided with flow guide holes (6), and a partition (7) is provided between the transverse baffle (4) and the side wall of the tundish (3); the height of the dam (2) is less than the height of the tundish (3), and the two dams (2) are respectively installed between the two downstream outlets (b) at the proximal end and the U-shaped turbulence suppressor (1), and each of the dams (2) is provided with a through hole (8).

2. A tundish dam structure according to claim 1, characterized in that: The included angle between the side retaining wall (5) and the transverse retaining wall (4) is an obtuse angle.

3. The tundish dam structure according to claim 1, characterized in that: There are four diversion holes (6) in total. One diversion hole (6) is correspondingly provided on each of the side retaining walls (5), and two diversion holes (6) are correspondingly provided on the transverse retaining wall (4).

4. The tundish dam structure according to claim 1, characterized in that: Each of the dams (2) has two through holes (8), and the two through holes (8) are respectively opened at one end of the dam (2) close to the side wall of the tundish (3).

5. The tundish dam structure according to claim 4, characterized in that: The through hole (8) is an inclined hole, and the axis of the through hole (8) gradually rises along the flow direction of the molten steel.

6. The tundish dam structure according to claim 1, characterized in that: The distance between the retaining dam (2) and the proximal water outlet (b) is 200-250 mm.

7. The tundish dam structure according to claim 6, characterized in that: The height of the dam (2) is 200-250 mm, and the height of the diversion hole (6) is greater than the height of the dam (2).

8. A tundish retaining dam structure according to any one of claims 1 to 7, characterized in that: The retaining dam (2) is connected to the tundish (3) via a knotting material (9).

9. The tundish dam structure according to claim 8, characterized in that: V-shaped clamping plates (10) are embedded in the two side walls of the tundish (3), the two ends of the dam (2) are respectively clamped in the two V-shaped clamping plates (10), and the knotting material (9) is filled in the V-shaped clamping plates (10).

10. The tundish dam structure according to claim 8, characterized in that: The shapes of the end faces at both ends of the dam (2) are adapted to the shapes of the two side walls of the tundish (3).

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