Integral tundish cover plate of eight-flow tundish

Abstract

The utility model discloses an integral type tundish cover plate of an eight-flow tundish. The integral type tundish cover plate is formed by integrally casting a steel structure and a refractory material, the steel structure comprises an outer frame steel frame and a plurality of longitudinal beams and transverse beams connected in the outer frame steel frame, the longitudinal beams are arranged in the width direction of the outer frame steel frame, the two ends of each longitudinal beam are connected with the outer frame steel frame, the longitudinal beams divide the outer frame steel frame into a plurality of quadrangles, at least two transverse beams are horizontally arranged in each quadrangle, and the two ends of each transverse beam are connected with the longitudinal beams. The transverse beams positioned on the same side in the adjacent quadrangles are distributed in a step shape; baking holes or stopper holes are alternately formed between the two transverse beams in each quadrangle, and exhaust holes are further formed near the two stopper holes on the outermost side. The transverse beams are arranged in a stepped mode, so that holes formed in the surface of the cover plate are not through, and the cover plate is good in flatness and not prone to deformation. And meanwhile, the steel structure and the refractory material are integrally cast and molded, so that buckling deformation in the using process is remarkably reduced, and the sealing performance is better.

Description

Technical Field

[0001] This utility model relates to the field of iron and steel metallurgy technology, specifically to an integral tundish cover plate for an eight-flow tundish. Background Technology

[0002] The tundish in continuous casting is a crucial metal container located between the ladle and the crystallizer. Its main functions include reducing molten steel pressure, diverting molten steel, ensuring continuous production, and promoting the flotation of inclusions. During casting, the tundish cover not only maintains the molten steel temperature, reduces heat loss, and acts as insulation, but also facilitates the tundish's heating process and provides thermal protection for the ladle. Furthermore, a well-sealed cover is beneficial for the argon sealing operation of the tundish cavity.

[0003] The tundish cover is typically placed directly on the tundish and operates cyclically with it. The specific process includes: baking – installing stopper rods – baking on the continuous casting platform – receiving molten steel – pouring steel (with argon protection) – cooling on the lower continuous casting platform. Currently, steel mills mostly use split-type tundish covers, which are composed of three smaller covers, primarily made by die casting of plain carbon steel or by knotting together castable refractory.

[0004] However, this type of split-type tundish cover has the following problems in practical applications: First, cumbersome installation: Due to the split design, multiple hoisting operations are required, making the installation process complex and time-consuming. Second, poor sealing: Large gaps exist between the smaller tundish covers, making them prone to flame propagation, leading to burnt steel plates at the cover ends, making effective sealing difficult, resulting in significant heat loss and poor insulation. Third, prone to deformation and burnt damage: The steel plates at the joint of the smaller tundish covers are directly exposed to flame and high-temperature molten steel heat radiation, making them extremely prone to deformation and burnt damage, which in turn leads to the refractory material cracking and spalling, significantly reducing the service life of the tundish cover. Fourth, impact on continuous casting process: The increased gap between the deformed cover plate and the tundish not only hinders tundish sealing but also obstructs the operation of the actuator when using the stopper rod mechanism, adversely affecting the continuous casting process. Utility Model Content

[0005] The purpose of this invention is to provide an integral intermediate bag cover for an eight-flow intermediate bag, which has good flatness and is not easily deformed.

[0006] The technical solution adopted in this utility model is an eight-flow tundish integral tundish cover plate, which is integrally cast from steel structure and refractory material;

[0007] The steel structure includes an outer steel frame and several longitudinal beams and transverse beams connected therein. Each longitudinal beam is set along the width of the outer steel frame and its two ends are connected to the outer steel frame. The longitudinal beams divide the interior of the outer steel frame into several quadrilaterals. Each quadrilateral has at least two transverse beams set horizontally. The two ends of each transverse beam are connected to the longitudinal beams, and the transverse beams on the same side in adjacent quadrilaterals are distributed in a stepped manner.

[0008] Baking holes or stopper holes are alternately arranged between the two transverse beams in each quadrilateral, and venting holes are also provided near the two outermost stopper holes.

[0009] The features of this utility model also include:

[0010] The baking hole is round, and the stopper rod hole is oval.

[0011] The angle between the major axis of the stopper rod hole and the length direction of the outer frame steel frame is 40-50°.

[0012] The angle between the major axis of the stopper rod hole and the length direction of the outer frame steel frame is 45°.

[0013] The opening of the bag is arched.

[0014] The casting plane of the liner is symmetrical about its centerline along its length.

[0015] There are 7 baking holes and 8 stopper rod holes, with one baking hole located on the center line along the length direction.

[0016] The outer steel frame is symmetrically equipped with multiple lifting lugs.

[0017] The transverse beams are made of φ60×8mm steel pipes.

[0018] The longitudinal beams are made of 40mm thick steel beams.

[0019] The beneficial effects of this utility model are:

[0020] 1. This utility model integrates multiple small ladle covers into a single unit by integrally casting the steel structure and refractory material. During use, the gantry crane can easily install it with a single hook, improving work efficiency and reducing the frequency of crane operation. Simultaneously, the integral casting process avoids direct contact between the molten steel's heat radiation and the steel structure frame, significantly improving the high-temperature resistance of the steel structure in the impact zone, greatly reducing warping deformation during use, preventing refractory material from peeling off, and significantly extending service life. Furthermore, the integral design effectively reduces the heat dissipation problem at the joints of traditional separate ladle covers, resulting in better sealing and significantly superior overall insulation performance compared to separate tundish covers, which is beneficial for stabilizing the molten steel temperature. The integrated structure also reduces the storage and management complexity of separate ladle covers, while reducing on-site space requirements, making it more suitable for the efficient management needs of modern continuous casting production.

[0021] 2. This utility model uses a stepped arrangement of transverse beams, meaning that the transverse beams on the same side of adjacent quadrilaterals are not collinear. This results in non-through holes, good flatness of the cover plate, and resistance to deformation.

[0022] Furthermore, by tilting the stopper rod hole, i.e., the long axis of the stopper rod hole forms an angle of 40-50° with the horizontal plane, the inner and outer positions of the stopper rod can be easily adjusted. The inner and outer cutting methods of the stopper rod can be determined according to the flow field of the molten steel in the ladle, thus solving the "difficulty of shutting off the flow of the small stopper rod in the billet".

[0023] Furthermore, by setting the spout of the ladle to an arch shape, the volume of the pouring area is increased, which not only meets the stroke requirements of the long spout of the large ladle, but also effectively prevents blockage and ensures the stability of the full-ladle pouring.

[0024] Furthermore, the transverse beam of this utility model uses a φ60×8mm steel pipe, which can improve the structural strength and effectively solve the problem of cover deformation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 yes Figure 1 Schematic diagram of the cross section at point AA;

[0027] In the diagram: 1. Outer steel frame, 2. Baking hole, 3. Stopper hole, 4. Horizontal beam, 5. Longitudinal beam, 6. Anchor, 7. Vent hole, 8. Hanging lug. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] An eight-flow tundish integral tundish cover plate includes a steel structure and refractory materials, wherein the steel structure and refractory materials are integrally cast.

[0031] like Figure 1 As shown, the steel structure includes an outer steel frame 1 and longitudinal beams 5 and transverse beams 4 connected inside it. The outer steel frame 1 is symmetrical along its length, with trapezoidal shapes on both sides. The casting area adopts an "elliptical" open type, specifically, with the minor axis of the ellipse as the opening, concave inward to form a semi-elliptical shape. This shape allows for a larger casting area and a wider range of long nozzle strokes, accommodating large-capacity casting. At the same time, this structure makes the refractory material more robust and less prone to falling off.

[0032] The outer frame steel frame 1 has several longitudinal beams 5 connected along its width. Both ends of each longitudinal beam 5 are fixed to both sides of the outer frame steel frame 1. The longitudinal beams 5 divide the interior of the outer frame steel frame 1 into several quadrilateral areas. Each quadrilateral area has at least two transverse beams 4. Both ends of the two transverse beams 4 are fixed to the longitudinal beams 5 on both sides. The transverse beams 4 are set along the length of the outer frame steel frame 1. The two transverse beams 4 are close to both sides of the outer frame steel frame 1. The transverse beams 4 on the same side in adjacent quadrilateral areas are set in a stepped manner, that is, the transverse beams 4 on the same side in adjacent quadrilateral areas are staggered in the width direction so that they are not on the same horizontal line. This design can reduce the deformation of the cover plate and make it more flat.

[0033] Each quadrilateral region is also provided with a baking hole 2 or a stopper hole 3, which are arranged alternately and are all located between two transverse beams 4 within the quadrilateral region. The two outermost stopper holes 3 are also provided with vent holes 7, which are located between two transverse beams 4 within the quadrilateral region.

[0034] Example 2

[0035] An eight-flow tundish integral tundish cover plate includes a steel structure and refractory materials, wherein the steel structure and refractory materials are integrally cast.

[0036] like Figure 1 As shown, the steel structure includes an outer steel frame 1 and longitudinal beams 5 and transverse beams 4 connected inside it. The outer steel frame 1 is symmetrical along its length, with trapezoidal shapes on both sides. The casting area adopts an "elliptical" open type, specifically, with the minor axis of the ellipse as the opening, concave inward to form a semi-elliptical shape. This shape allows for a larger casting area and a wider range of long nozzle strokes, accommodating large-capacity casting. At the same time, this structure makes the refractory material more robust and less prone to falling off.

[0037] The outer frame steel frame 1 has several longitudinal beams 5 connected along its width. Both ends of each longitudinal beam 5 are fixed to both sides of the outer frame steel frame 1. The longitudinal beams 5 divide the interior of the outer frame steel frame 1 into several quadrilateral areas. Each quadrilateral area has at least two transverse beams 4. Both ends of the two transverse beams 4 are fixed to the longitudinal beams 5 on both sides. The transverse beams 4 are set along the length of the outer frame steel frame 1. The two transverse beams 4 are close to both sides of the outer frame steel frame 1. The transverse beams 4 on the same side in adjacent quadrilateral areas are set in a stepped manner, that is, the transverse beams 4 on the same side in adjacent quadrilateral areas are staggered in the width direction so that they are not on the same horizontal line. This design can reduce the deformation of the cover plate and make it more flat.

[0038] Each quadrilateral region is also provided with a baking hole 2 or a stopper hole 3, which are arranged alternately and are all located between two transverse beams 4 within the quadrilateral region. In this embodiment, the baking hole 2 is circular and the stopper hole 3 is elliptical. Near the two outermost stopper holes 3, there are also exhaust holes 7, which are located between two transverse beams 4 within the quadrilateral region.

[0039] Example 3

[0040] An eight-flow tundish integral tundish cover plate includes a steel structure and refractory materials, wherein the steel structure and refractory materials are integrally cast.

[0041] like Figure 1 As shown, the steel structure includes an outer steel frame 1 and longitudinal beams 5 and transverse beams 4 connected inside it. The outer steel frame 1 is symmetrical along its length, with trapezoidal shapes on both sides. The casting area adopts an "elliptical" open type, specifically, with the minor axis of the ellipse as the opening, concave inward to form a semi-elliptical shape. This shape allows for a larger casting area and a wider range of long nozzle strokes, accommodating large-capacity casting. At the same time, this structure makes the refractory material more robust and less prone to falling off.

[0042] The outer frame steel frame 1 has several longitudinal beams 5 connected along its width. Both ends of each longitudinal beam 5 are fixed to both sides of the outer frame steel frame 1. The longitudinal beams 5 divide the interior of the outer frame steel frame 1 into several quadrilateral areas. Each quadrilateral area has at least two transverse beams 4. Both ends of the two transverse beams 4 are fixed to the longitudinal beams 5 on both sides. The transverse beams 4 are set along the length of the outer frame steel frame 1. The two transverse beams 4 are close to both sides of the outer frame steel frame 1. The transverse beams 4 on the same side in adjacent quadrilateral areas are set in a stepped manner, that is, the transverse beams 4 on the same side in adjacent quadrilateral areas are staggered in the width direction so that they are not on the same horizontal line. This design can reduce the deformation of the cover plate and make it more flat.

[0043] Each quadrilateral region is also provided with a baking hole 2 or a stopper rod hole 3, which are arranged alternately and are all located between two transverse beams 4 within the quadrilateral region. In this embodiment, the baking hole 2 is circular and the stopper rod hole 3 is elliptical, and the angle between the major axis of the stopper rod hole 3 and the length direction of the outer frame steel frame 1 is 40-50°, preferably 45°. The stopper rod hole 3 is set at an angle, which allows for adjustment of the stopper rod movement trajectory during use, thus better controlling the flow. Vent holes 7 are also provided near the two outermost stopper rod holes 3, and the vent holes 7 are located between two transverse beams 4 within the quadrilateral region.

[0044] Example 4

[0045] An eight-flow tundish integral tundish cover plate includes a steel structure and refractory materials, wherein the steel structure and refractory materials are integrally cast.

[0046] like Figure 1 As shown, the steel structure includes an outer steel frame 1 and longitudinal beams 5 and transverse beams 4 connected inside it. The outer steel frame 1 is symmetrical along its length, with trapezoidal shapes on both sides. The casting area adopts an "elliptical" open type, specifically, with the minor axis of the ellipse as the opening, concave inward to form a semi-elliptical shape. This shape allows for a larger casting area and a wider range of long nozzle strokes, accommodating large-capacity casting. At the same time, this structure makes the refractory material more robust and less prone to falling off.

[0047] The outer frame steel frame 1 has several longitudinal beams 5 connected along its width. Both ends of each longitudinal beam 5 are fixed to both sides of the outer frame steel frame 1. The longitudinal beams 5 divide the interior of the outer frame steel frame 1 into several quadrilateral areas. Each quadrilateral area has at least two transverse beams 4. Both ends of the two transverse beams 4 are fixed to the longitudinal beams 5 on both sides. The transverse beams 4 are set along the length of the outer frame steel frame 1. The two transverse beams 4 are close to both sides of the outer frame steel frame 1. The transverse beams 4 on the same side in adjacent quadrilateral areas are set in a stepped manner, that is, the transverse beams 4 on the same side in adjacent quadrilateral areas are staggered in the width direction so that they are not on the same horizontal line. This design can reduce the deformation of the cover plate and make it more flat.

[0048] Each quadrilateral region is also provided with a baking hole 2 or a stopper rod hole 3. The baking holes 2 and the stopper rod holes 3 are arranged alternately and are all located between two transverse beams 4 within the quadrilateral region. In this embodiment, the baking holes 2 are circular and the stopper rod holes 3 are elliptical. The angle between the major axis of the stopper rod hole 3 and the length direction of the outer frame steel frame 1 is 40-50°, preferably 45°. The stopper rod holes 3 are set at an angle so that the movement trajectory of the stopper rod can be adjusted during use, thus better controlling the flow.

[0049] In this embodiment, there are 7 baking holes 2, one of which is located on the center line in the length direction, and the other 6 are symmetrically arranged on both sides. There are 8 stopper holes 3, which are distributed alternately with the stopper holes 3. Near the stopper holes 3 at both ends in the length direction, there is also a vent hole 7. The vent hole 7 is located between the two transverse beams 4 in the quadrilateral area and is used for the heat circulation generated during the baking of the intermediate bread.

[0050] Example 5

[0051] An eight-flow tundish integral tundish cover plate includes a steel structure and refractory materials, wherein the steel structure and refractory materials are integrally cast.

[0052] like Figure 1As shown, the steel structure includes an outer steel frame 1 and longitudinal beams 5 and transverse beams 4 connected inside it. The outer steel frame 1 is symmetrical along its length, with trapezoidal shapes on both sides. The casting area adopts an "elliptical" open type, specifically, with the minor axis of the ellipse as the opening, concave inward to form a semi-elliptical shape. This shape allows for a larger casting area and a wider range of long nozzle strokes, accommodating large-capacity casting. At the same time, this structure makes the refractory material more robust and less prone to falling off.

[0053] The outer frame steel frame 1 has several longitudinal beams 5 connected along its width. Both ends of each longitudinal beam 5 are fixed to both sides of the outer frame steel frame 1. The longitudinal beams 5 divide the interior of the outer frame steel frame 1 into several quadrilateral areas. Each quadrilateral area has at least two transverse beams 4. Both ends of the two transverse beams 4 are fixed to the longitudinal beams 5 on both sides. The transverse beams 4 are set along the length of the outer frame steel frame 1. The two transverse beams 4 are close to both sides of the outer frame steel frame 1. The transverse beams 4 on the same side in adjacent quadrilateral areas are set in a stepped manner, that is, the transverse beams 4 on the same side in adjacent quadrilateral areas are staggered in the width direction so that they are not on the same horizontal line. This design can reduce the deformation of the cover plate and make it more flat.

[0054] Each quadrilateral region is also provided with a baking hole 2 or a stopper rod hole 3. The baking holes 2 and the stopper rod holes 3 are arranged alternately and are all located between two transverse beams 4 within the quadrilateral region. In this embodiment, the baking holes 2 are circular and the stopper rod holes 3 are elliptical. The angle between the major axis of the stopper rod hole 3 and the length direction of the outer frame steel frame 1 is 40-50°, preferably 45°. The stopper rod holes 3 are set at an angle so that the movement trajectory of the stopper rod can be adjusted during use, thus better controlling the flow.

[0055] In this embodiment, there are 7 baking holes 2, one of which is located on the center line in the length direction, and the other 6 are symmetrically arranged on both sides. There are 8 stopper holes 3, which are distributed alternately with the stopper holes 3. Near the stopper holes 3 at both ends in the length direction, there is also a vent hole 7. The vent hole 7 is located between the two transverse beams 4 in the quadrilateral area and is used for the heat circulation generated during the baking of the intermediate bread.

[0056] Y-shaped anchors 6 are installed on the outer steel frame 1, each transverse beam 4, and the longitudinal beam 5 to enhance the stability of the overall structure, effectively anchor it to the filling material, and ensure the connection strength and stability of the entire cover plate.

[0057] Multiple hanging ears 8 are welded on the outer steel frame 1. Preferably, the hanging ears 8 are set at 1 / 4 of the distance from the two sides on the horizontal direction and the inclined side of the trapezoid.

[0058] like Figure 2 As shown, lightweight slab casting is used to tie the baking hole area, and the thickness of the rest of the slab cover is the same as the thickness of the outer frame steel frame 1.

[0059] Example 6

[0060] like Figure 1 As shown, in this embodiment, the outer frame steel frame 1 is made of 40mm steel plate, with dimensions of 10260×1234mm, a trapezoidal hypotenuse of 4167.5mm, a casting zone length of 1220.1mm, an elliptical semi-major axis of 975mm, and an arc radius of 390mm. One baking hole 2 is located at the center, with three symmetrically arranged on the left and right sides, totaling seven φ320mm circular baking holes 2. Elliptical stopper holes 3 are interspersed among the baking holes 2, totaling eight. The dimensions of all eight stopper holes 3 are 300mm major axis and 220mm minor axis. The transverse beam 4 is made of φ60×8mm steel pipe, and the longitudinal beam 5 is made of 40mm thick steel beam. Figure 2 As shown, lightweight capping casting material is used to tie the baking hole area, with a tying thickness of 200mm. The rest of the area is consistent with the outer frame steel frame 1, which has a thickness of 180mm.

[0061] Y-shaped anchors 6 are installed on the outer steel frame 1, each transverse beam 4, and the longitudinal beam 5.

[0062] The outer steel frame 1 is provided with hanging lugs 8 at 1 / 4 of the distance from the two side edges.

Claims

1. An integrated tundish cover plate for eight-flow intermediate tundishes, characterized in that: It is integrally cast from steel structure and refractory materials; The steel structure includes an outer steel frame (1) and several longitudinal beams (5) and transverse beams (4) connected therein. Each longitudinal beam (5) is set along the width direction of the outer steel frame (1) and its two ends are connected to the outer steel frame (1). The longitudinal beams (5) divide the interior of the outer steel frame (1) into several quadrilaterals. At least two transverse beams (4) are set horizontally in each quadrilateral. The two ends of each transverse beam (4) are connected to the longitudinal beams (5), and the transverse beams (4) located on the same side in adjacent quadrilaterals are distributed in a stepped manner. Baking holes (2) or stopper holes (3) are alternately arranged between the two transverse beams (4) in each quadrilateral, and exhaust holes (7) are also arranged near the two outermost stopper holes (3).

2. The eight strand tundish monoblock tundish cover of claim 1, wherein, The baking hole (2) is circular, and the stopper hole (3) is elliptical.

3. The eight strand tundish monoblock tundish cover of claim 2, wherein, The angle between the major axis of the stopper hole (3) and the length direction of the outer frame steel frame (1) is 40-50°.

4. The eight strand tundish monoblock tundish cover of claim 2 or 3, wherein The angle between the major axis of the stopper hole (3) and the length direction of the outer frame steel frame (1) is 45°.

5. The eight strand tundish monoblock tundish cover of claim 1 wherein, The opening of the bag is arched.

6. The eight-flow tundish integral tundish cover plate according to claim 1, characterized in that, The casting plane of the intermediate cover plate is symmetrical about its center line along its length.

7. The eight strand tundish monoblock tundish cover of claim 6, wherein, There are 7 baking holes (2) and 8 stopper holes (3), one of which is located on the center line in the length direction.

8. The eight strand tundish monoblock tundish cover of claim 1 wherein, The outer steel frame (1) is symmetrically provided with multiple lifting lugs (8).

9. The eight strand tundish monoblock tundish cover of claim 1 wherein, The transverse beam (4) is made of φ60×8mm steel pipe.

10. The eight strand tundish monoblock tundish cover of claim 1 wherein, The longitudinal beam (5) is a 40mm thick steel beam.

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