Tundish sewer pipe structure

Abstract

The utility model relates to the technical field of steel casting, in particular to a tundish sewer pipe structure which comprises a sewer pipe, the sewer pipe is connected with the bottom of a tundish, a retaining wall is arranged in the tundish, and a slag retaining cover is arranged at the joint of the sewer pipe and the tundish. A liquid inlet cavity is formed in the slag stopping cover, the sewer pipe is communicated with the liquid inlet cavity, a first molten steel interaction area and a second molten steel interaction area are formed in the slag stopping cover, and the liquid inlet cavity is communicated with the inner cavity of the tundish through the first molten steel interaction area and the second molten steel interaction area; the first molten steel interaction area faces a retaining wall arranged in the tundish; the replaceable slag blocking cover is additionally arranged on the sewer pipe, the first molten steel interaction area and the second molten steel interaction area are arranged on the slag blocking cover, molten steel can enter the slag blocking cover to block steel slag, and the influence of the steel slag on the sewer pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of steel casting, in particular to a tundish downpipe structure. Background Art

[0002] Continuous casting, that is, continuous steel casting, is a molten steel forming technology that continuously adds refined molten steel into a crystallizer and pulls the molten steel out from the bottom of the crystallizer after solidification. Usually, the tundish continuous casting metallurgical method is used. The overall process flow is that the ladle is first transported to the rotary tower through a transport device, and then the molten steel in the ladle is transported to the crystallizer through a unloading mechanism to solidify and form a shell. The ingot with liquid core is then cooled in the secondary cooling zone to make the shell grow evenly and stably. Finally, the shell is completely produced and transported to the steel rolling process for processing via a conveying mechanism.

[0003] The tundish is mainly used for diverting, continuously pouring and protecting molten steel in the entire continuous casting process. However, in actual use, when the molten steel enters the tundish through the down pipe or the long nozzle, the initial tundish temperature is low and slag will form. Long-term use will cause blockage or corrosion of the down pipe structure, reducing the service life of the tundish.

[0004] To solve this problem, a stopper rod is usually used to quickly change the water outlet, but not all tundishes are suitable for installing a stopper rod. It is also difficult for such tundishes to solve the problem of slag affecting the downcomer. Utility Model Content

[0005] In view of the above problems, the utility model provides a downpipe structure for a tundish.

[0006] The technical solution adopted is a tundish downpipe structure, comprising a downpipe, the downpipe is connected to the bottom of the tundish, a retaining wall is arranged in the tundish, and a slag retaining cover is arranged at the connection between the downpipe and the tundish;

[0007] The slag retaining cover is provided with a liquid inlet cavity, and the downpipe is connected to the liquid inlet cavity, the slag retaining cover is provided with a first molten steel interaction area and a second molten steel interaction area, and the liquid inlet cavity is connected to the internal cavity of the tundish through the first molten steel interaction area and the second molten steel interaction area;

[0008] The first molten steel interaction area faces a retaining wall arranged in the tundish;

[0009] The second molten steel interaction area faces away from the retaining wall arranged in the tundish.

[0010] Furthermore, the projection of the slag blocking cover is a rectangular structure, and the projection of the slag blocking cover covers the sewer pipe.

[0011] Optionally, the slag stop cover is made of refractory material.

[0012] Optionally, first indirect uniform through holes begin to appear in the first molten steel interaction region, and second indirect uniform through holes begin to appear in the second molten steel interaction region, and the aperture of the first through hole is smaller than the aperture of the second through hole.

[0013] Furthermore, the first molten steel interaction area is arranged at the upper part of one end of the slag stop cover, the second molten steel interaction area is arranged at the lower part of the other end of the slag stop cover, and an inclined surface is also arranged above the second molten steel interaction area.

[0014] Optionally, the bottom of the tundish includes a seat brick and a working lining, and the working lining is arranged above the seat brick, the slag blocking cover is arranged above the working lining, and a connecting surface is provided between the contact surface between the slag blocking cover and the working lining, and the connecting surface is covered with a fixed lining.

[0015] The beneficial effects of the present utility model include at least one of the following:

[0016] 1. By adding a replaceable slag blocking cover to the downcomer, and setting a first molten steel interaction area and a second molten steel interaction area on the slag blocking cover, molten steel can enter to block the slag, thereby reducing the impact of the slag on the downcomer.

[0017] 2. By setting up a special first molten steel interaction area and a second molten steel interaction area position structure, and matching it with an inclined surface set on the slag stop cover, even if a part of the slag enters the liquid inlet cavity in the slag stop cover, it can stay in the liquid inlet cavity during continuous use and be removed during maintenance and replacement, thereby reducing the impact of the slag on the drain. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the tundish;

[0019] Figure 2 This is a schematic diagram of a downcomer structure of a tundish;

[0020] Figure 3 This is a schematic diagram of another type of downcomer structure;

[0021] Wherein the figure marks are: 15 is the tundish, 16 is the cover plate, 29 is the down pipe, 40 is the slag retaining cover, 41 is the seat brick, 42 ​​is the working lining, 43 is the liquid inlet cavity, 44 is the slag, 45 is the inclined surface, 46 is the connecting surface, 47 is the second molten steel interaction area, 48 is the fixed lining, and 49 is the first molten steel interaction area. DETAILED DESCRIPTION

[0022] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0023] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0024] like Figures 1 to 3 As shown, a downpipe structure of a tundish includes a downpipe 29, the downpipe 29 is connected to the bottom of a tundish 15, a retaining wall is provided in the tundish 15, and a slag retaining cover 40 is provided at the connection between the downpipe 29 and the tundish 15;

[0025] The slag blocking cover 40 is provided with a liquid inlet cavity 43, and the downpipe 29 is connected to the liquid inlet cavity 43. The slag blocking cover 40 is provided with a first molten steel interaction area 49 and a second molten steel interaction area 47, and the liquid inlet cavity 43 is connected to the internal cavity of the tundish 15 through the first molten steel interaction area 49 and the second molten steel interaction area 47;

[0026] The first molten steel interaction area 49 faces the retaining wall provided in the tundish 15;

[0027] The second molten steel interaction area 47 faces away from the retaining wall provided in the tundish 15 .

[0028] The purpose of this design is to add a replaceable slag cover to the downcomer and set a first molten steel interaction area and a second molten steel interaction area on the slag cover, so that molten steel can enter to block the slag and reduce the impact of the slag on the downcomer, thereby solving the problem that some ladles that are not suitable for installing stopper rods cannot effectively deal with the impact of slag on the downcomer.

[0029] It should be pointed out that the tundish that is not suitable for installing a stopper rod in this embodiment mainly refers to a tundish with a transversely arranged argon blowing tube, in which the argon blowing tube and the stopper rod interfere with each other.

[0030] At the same time, due to the constraints of objective conditions, a small amount of slag will inevitably be produced when the molten steel enters the tundish due to the rapid temperature change. However, as the whole process continues, the temperature of the tundish rises and slag no longer continues to be produced.

[0031] In this embodiment, the projection of the slag stop cover 40 is a rectangular structure, and the projection of the slag stop cover 40 covers the down pipe 29. The slag stop cover 40 is made of refractory material. An indirect uniform first through hole begins to be formed in the first molten steel interaction area 49, and an indirect uniform second through hole begins to be formed in the second molten steel interaction area 47. The aperture of the first through hole is smaller than the aperture of the second through hole. The first molten steel interaction area 49 is arranged at the upper part of one end of the slag stop cover 40, and the second molten steel interaction area 47 is arranged at the lower part of the other end of the slag stop cover 40, and an inclined surface 45 is also arranged above the second molten steel interaction area 47.

[0032] The purpose of this design is to set up a special first molten steel interaction area and a second molten steel interaction area position structure, and match it with an inclined surface set on the slag stop cover, so that even if a part of the slag enters the liquid inlet cavity in the slag stop cover, it can stay in the liquid inlet cavity during continuous use and be removed during maintenance and replacement, thereby reducing the impact of the slag on the drain.

[0033] In actual use, since one side of the slag retaining cover faces the retaining wall arranged in the ladle 15 and the other side faces the frame of the ladle 15, the molten steel first flows into the liquid inlet chamber from the first molten steel interaction area, part of the molten steel is discharged from the downpipe, and the other part of the molten steel flows out from the second molten steel interaction area, and the large slag is blocked outside the slag retaining cover. At the same time, due to the influence of tension, most of the fine slag entering the liquid inlet chamber also stays on the surface. In addition, the aperture of the first through hole is smaller than that of the second through hole, so that the molten steel flow rate close to the retaining wall is larger, so that the slag 44 basically stays in the inclined surface area.

[0034] As the continuous casting process progresses, when the second molten steel interaction area serves as the main molten steel inlet area, a portion of the molten steel is discharged from the first molten steel interaction area, and the slag 44 moves from the inclined surface area toward the first molten steel interaction area.

[0035] In this embodiment, the bottom of the tundish 15 includes a seat brick 41 and a working lining 42, and the working lining 42 is arranged above the seat brick 41, the slag blocking cover 40 is arranged above the working lining 42, and the contact surface between the slag blocking cover 40 and the working lining 42 is provided with a connecting surface 46, and the connecting surface 46 is covered with a fixed lining 48.

[0036] The purpose of such design is to improve the connection tightness between the slag retaining cover and the working lining by setting a fixed lining and a connecting surface. When performing maintenance, the slag retaining cover can be removed by opening the cover plate 16 on the top of the intermediate ladle 15, removing the fixed lining, and clearing the slag inside.

[0037] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tundish downcomer structure, comprising a downcomer (29), wherein the downcomer (29) is connected to the bottom of a tundish (15), wherein a retaining wall is provided inside the tundish (15), characterized in that: A slag blocking cover (40) is provided at the connection between the down pipe (29) and the tundish (15); The slag blocking cover (40) is provided with a liquid inlet cavity (43), and the downpipe (29) is in communication with the liquid inlet cavity (43); the slag blocking cover (40) is provided with a first molten steel interaction area (49) and a second molten steel interaction area (47), and the liquid inlet cavity (43) is in communication with an internal cavity of the tundish (15) through the first molten steel interaction area (49) and the second molten steel interaction area (47); The first molten steel interaction area (49) faces a retaining wall arranged in the tundish (15); The second molten steel interaction area (47) faces away from a retaining wall provided in the tundish (15).

2. The tundish downcomer structure according to claim 1, characterized in that: The projection of the slag blocking cover (40) is a rectangular structure, and the projection of the slag blocking cover (40) covers the downpipe (29).

3. The tundish downcomer structure according to claim 1, characterized in that: The slag blocking cover (40) is made of refractory material.

4. The tundish downcomer structure according to claim 1, characterized in that: Indirect uniform first through holes begin to appear in the first molten steel interaction area (49), and indirect uniform second through holes begin to appear in the second molten steel interaction area (47), and the aperture of the first through hole is smaller than the aperture of the second through hole.

5. A tundish downcomer structure according to any one of claims 1 to 4, characterized in that: The first molten steel interaction area (49) is arranged at the upper part of one end of the slag blocking cover (40), the second molten steel interaction area (47) is arranged at the lower part of the other end of the slag blocking cover (40), and an inclined surface (45) is also arranged above the second molten steel interaction area (47).

6. The tundish downcomer structure according to claim 5, characterized in that: The bottom of the tundish (15) comprises a seat brick (41) and a working lining (42), wherein the working lining (42) is arranged above the seat brick (41), the slag blocking cover (40) is arranged above the working lining (42), and a connecting surface (46) is provided on the contact surface between the slag blocking cover (40) and the working lining (42), and the connecting surface (46) is covered with a fixing lining (48).

Images