Water nozzle seating brick device for continuous casting tundish of double-flow-control system

Abstract

The utility model discloses a nozzle seating brick device for a continuous casting tundish of a double flow control system, which comprises a seating brick body, a zirconium bowl, a zirconium core body and a quick-change upper nozzle are sequentially arranged in a through hole in the middle of the seating brick body from top to bottom, and the seating brick body, the zirconium bowl, the zirconium core and the quick-change upper nozzle are integrally formed in a pouring mode. A quick-change water outlet matched with the quick-change water inlet is formed in the bottom of the quick-change water inlet; the water gap seat brick is simple in structure, and the safety problem of steel seepage in the using process of the water gap and the seat brick is avoided.

Description

Technical Field

[0001] The utility model relates to a nozzle seat brick device for a continuous casting tundish with a dual-flow control system. Background Art

[0002] During the pouring of molten steel, the continuous casting tundish can achieve continuity, significantly improving the production efficiency of steel. When the tundish realizes the continuous pouring function, it is necessary to control the molten steel in the tundish to enter the mold at a constant speed through the tundish flow control device. At present, there are mainly two flow control methods for continuous casting tundishes. One is the stopper rod flow control, and the other is the quick-change fixed-diameter nozzle flow control. In actual applications, different flow control methods can be selected according to the characteristics of different steel grades. In recent years, materials and metallurgy researchers have proposed a dual-flow control technical solution for tundishes by taking advantage of the stopper rod and quick-change fixed-diameter nozzle flow control methods. This solution can not only significantly improve the service life of the tundish, but also effectively reduce production accidents such as the decrease in the nozzle life caused by nozzle oxygen burning and the easy loss of control.

[0003] Currently, the refractories required for the dual-flow control technology include stopper rods, upper nozzles, quick-change upper nozzles, quick-change lower nozzles, and seat bricks, etc. The upper nozzle and the quick-change upper nozzle are spliced together through a male-female buckle, and the nozzle and the seat brick are inlaid together through fire clay. During the production process of high casting speed and long casting heat, the fire clay joint between the nozzle and the seat brick may cause molten steel leakage, resulting in the nozzle turning red, and even causing molten steel penetration between the nozzle and the seat brick, seriously affecting the safe production of the steel plant and the long life of the tundish.

[0004] In view of the above problems, the utility model provides a nozzle seat brick device for a continuous casting tundish with a dual-flow control system. Summary of the Invention

[0005] The purpose of the utility model is to solve the shortcomings existing in the prior art. The utility model provides a nozzle seat brick device for a continuous casting tundish with a dual-flow control system, avoiding the safety problem of molten steel leakage that occurs between the nozzle and the seat brick during use.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A nozzle seat brick device for a continuous casting tundish with a dual-flow control system includes a seat brick body. A zircon bowl, a zircon core, and a quick-change upper nozzle are sequentially arranged from top to bottom in the through hole in the middle of the seat brick body. At the same time, the seat brick body, the zircon bowl, the zircon core, and the quick-change upper nozzle are integrally formed by pouring. A quick-change lower nozzle adapted to the quick-change upper nozzle is arranged at the bottom of the quick-change upper nozzle.

[0008] The utility model further defines the technical scheme:

[0009] Preferably, the seat brick body, the quick-change upper water inlet, and the outer sleeves of the quick-change lower water inlets are made of the same material, which is corundum-mullite material with a low coefficient of thermal expansion.

[0010] Preferably, the zircon bowl and the zircon core are made of zirconia material formed by high-pressure molding and fired at high temperature, which has excellent thermal shock stability, erosion resistance, and corrosion resistance.

[0011] Preferably, the aperture D1 of the zircon core is 1.3 - 1.6 times that of the aperture D2 of the quick-change upper water inlet, which can prevent the water inlet from expanding in diameter, and the upper part is larger than the lower part to avoid generating negative pressure.

[0012] Preferably, the inner surface of the zircon bowl is inclined, which matches the shape of the similar stopper rod.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] The seat brick body, zircon bowl, zircon core, and quick-change upper water inlet of the present utility model are integrally formed by pouring, which avoids the safety problem of steel leakage between the water inlet and the seat brick during use. Pouring the zircon bowl and zircon core on the upper part of the seat brick eliminates the upper water inlet, and has the advantages of simple, safe, and efficient production processes.

[0015] The inner surface of the zircon bowl is inclined, not circular. The corresponding stopper rod head also has an inclined surface at a corresponding angle. Compared with the circular arc surface, this inclined surface structure increases the contact area between the bowl part and the stopper rod head, changing from line contact in the case of circular arc - circular arc contact to surface contact, enabling the stopper rod to accurately control the flow and avoiding the occurrence of out-of-control phenomena due to erosion of the stopper rod head. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Embodiment

[0018] Refer to Figure 1, A tundish nozzle seat brick device for a double-control flow system continuous casting, comprising a seat brick body 1. A zircon bowl 2, a zircon core 3 and a quick-change upper nozzle 4 are sequentially arranged from top to bottom in the through hole in the middle of the seat brick body. At the same time, the seat brick body 1, the zircon bowl 2, the zircon core 3 and the quick-change upper nozzle 4 are integrally formed by casting. The materials of the seat brick body, the outer sleeve of the quick-change upper nozzle and the quick-change lower nozzle are the same, all being corundum-mullite materials with a low expansion coefficient. The zircon bowl and the zircon core are made of zirconia materials formed by high-pressure molding and fired at high temperature, which have excellent thermal shock stability, erosion resistance and anti-corrosion properties. A quick-change lower nozzle 6 adapted to it is arranged at the bottom of the quick-change upper nozzle. The inner surface of the zircon bowl is inclined, and the angle between it and the horizontal line is 60°. At the same time, it matches the stopper 5 with a similar shape, and the aperture D1 of the zircon core is 1.3 times the aperture D2 of the quick-change upper nozzle.

[0019] In this embodiment, the seat brick body, the zircon bowl, the zircon core and the quick-change upper nozzle are integrally formed by casting, which avoids the safety problem of steel leakage that occurs during the use of the nozzle and the seat brick. The zircon bowl and the zircon core are cast on the upper part of the seat brick, replacing the upper upper nozzle, and have the advantages of simple, safe and efficient production processes.

[0020] The inner surface of the zircon bowl is inclined, not arc-shaped. The corresponding stopper head is also an inclined surface at a corresponding angle. Compared with the arc surface, this inclined surface structure increases the contact area between the bowl part and the stopper head, changing from line contact in the case of arc-arc contact to surface contact, enabling the stopper to accurately control the flow and avoiding the occurrence of out-of-control phenomena due to erosion of the stopper head.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention.

[0022] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A tundish nozzle seat brick device for a double-control flow system continuous casting, comprising a seat brick body, characterized in that: A zircon bowl, a zircon core body and a quick-change upper water inlet are sequentially arranged from top to bottom in a through hole in the middle of the seat brick body. At the same time, the seat brick body, the zircon bowl, the zircon core and the quick-change upper water inlet are integrally formed by pouring. A quick-change lower water inlet adapted to the bottom of the quick-change upper water inlet is arranged.

2. The nozzle seat brick device for a continuous casting tundish of a dual-control flow system according to claim 1, characterized in that: The seat brick body, the outer jackets of the quick-change upper water inlet and the quick-change lower water inlet are made of the same material, which is corundum-mullite material with a low coefficient of thermal expansion.

3. The nozzle seat brick device for the continuous casting tundish of the dual-control flow system according to claim 1, characterized in that: The zircon bowl and the zircon core are made of zirconia material formed by high-pressure molding and fired at high temperature.

4. A nozzle seat brick device for a continuous casting tundish of a double-control flow system according to claim 1, characterized in that: The aperture D1 of the zircon core is 1.3 - 1.6 times the aperture D2 of the quick-change upper water inlet.

5. The nozzle seat brick device for a continuous casting tundish of a double-control flow system according to claim 1, characterized in that: The inner surface of the zircon bowl is inclined and matches a stopper with a similar shape.

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