CN216966273U

CN216966273U - Inflatable dam and tundish

Info

Publication number: CN216966273U
Application number: CN202220170999.4U
Authority: CN
Inventors: 赵金秋; 邓乐锐; 秦颖; 王丽丽; 董战春
Original assignee: Beijing Allied Rongda Engineering Material Co ltd
Current assignee: Beijing Allied Rongda Engineering Material Co ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-07-15
Anticipated expiration: 2032-01-21

Abstract

The utility model relates to the technical field of continuous casting tundishes, in particular to an inflatable dam and a tundish. The inflatable dam is installed in a tundish, an air inlet is inflated from the outside of the tundish, gas is exhausted from an air blowing port through an air chamber, the air blowing port blows to effectively drive molten steel on the upstream surface and the near back flow surface of a dam body to flow, the molten steel flow field near the dam body is effectively improved, the defect that the molten steel in the dead zone near the traditional dam is difficult to flow is avoided, the dead zone volume is reduced, the molten steel purification capacity of the tundish is effectively improved, non-metallic inclusions in steel can be removed more thoroughly, and the steel quality is improved.

Description

Inflatable dam and tundish

Technical Field

The utility model relates to the technical field of continuous casting tundishes, in particular to a blowing dam and a tundish.

Background

The continuous casting tundish is an intermediate link of a steelmaking production flow and is an important ring for improving the yield and the quality of steel. The retaining wall and the retaining dam are generally arranged in the tundish, the combination of the retaining wall and the retaining dam is a commonly adopted flow control device, the flow control device can improve the molten steel flow field in the tundish, prolong the average residence time of the molten steel in the tundish, effectively remove non-metallic inclusion of steel, purify the molten steel, improve the steel quality,

in the prior art, the dam is of a plate-shaped structure, the dam is separated in the tundish, the length of the dam is equal to the width of the tundish, the height of the dam is generally lower than half of the height of the tundish, and the dam is matched with a retaining wall with a suspended lower part and vertically placed at a proper position between a molten steel inlet and a molten steel outlet in the tundish. The molten steel entering the tundish flows continuously after flowing through the lower part of the retaining wall, is stopped by the dam arranged at the ladle bottom in front and is forced to flow upwards to turn over the dam, so that the molten steel flowing through the dam flows obliquely upwards to a steel slag interface, and impurities in the steel are removed by reaction with upper slag.

Therefore, the dam forms a stagnant zone in the vicinity thereof on the basis of its characteristics, so that molten steel in the peripheral part region thereof hardly flows, particularly in the vicinity of the dam root, where the stagnant zone is a dead zone, and the larger the dead zone volume of the tundish, the smaller the effective volume of the tundish, which is disadvantageous for improving the cleanliness of molten steel. Therefore, it is one of the problems that the workers of the continuous casting and steel making work extensively to reduce the dead zone ratio to the maximum extent, improve the molten steel flow efficiency, and exert the metallurgical function of the tundish to the maximum extent.

SUMMERY OF THE UTILITY MODEL

The utility model provides a blowing dam and a tundish, which are used for solving the defect that dead zones formed near the dam are not beneficial to molten steel flowing and influence molten steel purification in the prior art, effectively improving a molten steel flow field of the tundish and improving the molten steel purification capacity of the tundish.

The utility model provides an inflatable dam which comprises a dam body, wherein the dam body is provided with a flow facing surface and a flow backing surface, the flow facing surface and the flow backing surface are obliquely arranged, air blowing ports are respectively arranged on the surfaces of the flow facing surface and the flow backing surface, an air chamber is arranged inside the dam body and communicated with the air blowing ports, an air inlet is arranged on the side surface of the dam body and communicated with the air chamber.

According to one embodiment of the utility model, the air blowing openings are strip-shaped through holes which are horizontally arranged on the flow facing surface and the back flow surface, and two ends of each air blowing opening extend to the edges of the flow facing surface and the back flow surface.

According to one embodiment of the utility model, a plurality of the air blowing openings are arranged along the surfaces of the incident flow surface and the back flow surface at intervals, and the air blowing openings are arranged in a gradient manner.

According to one embodiment of the utility model, an air permeable block is embedded in the air blowing port, and the air permeable block is provided with an air hole penetrating through the air blowing port.

According to one embodiment of the utility model, the gas-permeable block is a dispersed pore structure cast with refractory material having a porosity greater than or equal to 30%.

According to one embodiment of the utility model, the air chamber and the air inlet are provided in plurality, and each air chamber, the air inlet and the air blowing port are communicated in a one-to-one correspondence manner.

According to one embodiment of the utility model, one air chamber and one air inlet are respectively arranged, and the air chamber is communicated with the air blowing openings on the incident flow surface and the back flow surface.

According to one embodiment of the utility model, the dam body has a trapezoidal or triangular cross-section in the flow direction.

According to one embodiment of the utility model, the outlet is arranged vertically upwards.

The utility model also provides a tundish, which comprises a tundish body, wherein a retaining wall is arranged in the tundish body, a flow channel is formed between the retaining wall and the bottom of the tundish body, the downstream side of the retaining wall is provided with the inflatable dam, and the surface of the tundish body is provided with a pipeline interface communicated with an air inlet of the inflatable dam.

According to the inflatable dam and the tundish, the incident flow surface and the back flow surface of the dam body are arranged to be inclined, the surfaces of the incident flow surface and the back flow surface are respectively provided with an air blowing hole, an air chamber is arranged in the dam body and communicated with the air blowing holes, and an air inlet is arranged on the side surface of the dam body and communicated with the air chamber. The blowing dam is installed in a tundish, an air inlet is inflated from the outside of the tundish, air is exhausted from an air blowing port through an air chamber, the air blowing port blows air to effectively drive molten steel near a flow-facing surface and a back flow surface of a dam body to flow, the molten steel flow field near the dam body is effectively improved, the defect that the molten steel is not easy to flow near a dead zone of a traditional dam is overcome, the dead zone volume is reduced, the molten steel purification capacity of the tundish is effectively improved, non-metallic inclusions in steel can be removed more thoroughly, and the steel quality is improved.

Drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of the construction of an inflatable dam provided by the present invention;

FIG. 2 is a cross-sectional view of the inflatable dam provided by the present invention;

FIG. 3 is a side view of the inflatable dam provided by the present invention;

FIG. 4 is a cross-sectional view of one embodiment of the inflatable dam provided by the present invention;

FIG. 5 is a side view of one embodiment of an inflatable dam provided by the present invention;

FIG. 6 is a cross-sectional view of a tundish provided by the present invention;

FIG. 7 is a schematic diagram of the operating principle of the tundish provided by the present invention;

fig. 8 is an external view of a tundish provided by the present invention.

Reference numerals:

100: a dam body; 110: the head-on surface; 120: a back flow surface; 200: blowing the air; 300: an air inlet; 400: a gas chamber; 401: an air flow channel; 500: a gas permeable block; 600: a tundish body; 700: retaining walls; 800: a flow channel; 900: a pipeline interface.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the utility model, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Referring to fig. 1 to 8, an embodiment of the present invention provides an inflatable dam, which includes a dam body 100, wherein the dam body 100 is in a pyramid shape, one side of the dam body 100 is a flow-facing surface 110, the other side of the dam body is a flow-backing surface 120, the flow-facing surface 110 and the flow-backing surface 120 are disposed in an inclined manner, air outlets 200 are respectively disposed on the surfaces of the flow-facing surface 110 and the flow-backing surface 120, an air chamber 400 is disposed inside the dam body 100, the air chamber 400 is communicated with all the air outlets 200, meanwhile, an air inlet 300 is disposed on a side surface of the dam body 100 contacting with an inner wall of a tundish, one end of the air inlet 300 extends into the interior of the dam body 100 to be communicated with the air chamber 400, and the other end is communicated with the surface of the dam body 100.

In this embodiment, the air inlet 300 may be connected to an air source, air enters the air chamber 400 from the air inlet 300, and then is blown out from the incident flow surface 110 and the back flow surface 120 through the air blowing port 200, as shown in fig. 6, the air blowing port 200 blows air to drive the molten steel near the dam body 100 to flow, so as to improve the flow field of the molten steel, reduce the volume of the dead zone near the dam body 100, and make the molten steel not easily stagnate near the incident flow surface 110 and the back flow surface 120, thereby effectively improving the molten steel purification capability of the tundish, enabling the non-metallic inclusion of the steel grade to be removed more thoroughly, and improving the steel quality.

As shown in fig. 1, in one embodiment, the outlet 200 is a strip-shaped through hole horizontally disposed on the incident flow surface 110 and the back flow surface 120, and both ends of the outlet 200 extend to the edges of the incident flow surface 110 and the back flow surface 120. That is, the length of the air blowing opening 200 is slightly less than the blocking length of the dam body 100, so that the air blowing range of the air blowing opening 200 is enlarged, dead zones in the tundish can be effectively reduced, dead-angle-free air blowing at the bottom of the tundish is realized, molten steel flowing in the area near the bottom of the dam body 100 is comprehensively improved, and the molten steel purification effect is improved.

As shown in fig. 1 and fig. 2, in an embodiment, a plurality of air outlets 200 are arranged at intervals along the surfaces of the incident flow surface 110 and the back flow surface 120, and the plurality of air outlets 200 are arranged in a gradient manner. Thus, the blowing range is expanded, the dead zone near the upstream surface 110 and the downstream surface 120 is eliminated in a larger range, the flow of molten steel is further promoted, and the molten steel purification effect is improved.

As shown in FIG. 2, in one embodiment, an air permeable block 500 is embedded in the outlet 200, and the air permeable block 500 has an air hole therethrough. Preferably, the gas permeable block 500 is a dispersed pore structure with porosity greater than or equal to 30% formed by pouring refractory materials, so that gas can be uniformly blown out, the fluidity of molten steel can be comprehensively improved, and the phenomenon that the slag surface is damaged due to excessive blowing and the purification of the molten steel is influenced can be prevented.

As shown in fig. 2 and 3, in some embodiments, a plurality of air chambers 400 and air inlets 300 are provided, and each of the air chambers 400, the air inlets 300, and the blowing openings 200 are in one-to-one correspondence. Thus, each air inlet 300 is connected with an independent air source, each air blowing port 200 can independently adjust air blowing, the air blowing ports 200 are not interfered with each other, air blowing at different positions can be adjusted according to actual air blowing requirements, and especially the air blowing requirements of different force of the upstream surface 110 and the downstream surface 120 are met.

Of course, the outlets 200 of the dam body 100 may be identical to achieve the same control. As shown in fig. 4 and 5, in some embodiments, there is one air chamber 400 and one air inlet 300, and the air chamber 400 is communicated with the blowing openings 200 on the incident flow surface 110 and the back flow surface 120.

Specifically, an air chamber 400 is provided in the middle of the dam body 100, and the air chamber 400 is communicated with each of the air outlets 200 through an air flow channel 401. Meanwhile, a larger air inlet 300 is arranged on the side surface of the dam body 100, the air inlet 300 is connected with an air source, and the plurality of air outlets 200 blow air simultaneously, so that the incident flow surface 110 and the back flow surface 120 have the same blowing amount.

In some embodiments, the incident flow surface 110 and the back flow surface 120 of the dam body 100 may be symmetrically disposed, and the cross section of the dam body 100 along the flow direction is trapezoidal or triangular. Of course, the incident flow surface 110 and the back flow surface 120 of the dam body 100 may also be asymmetric.

In some embodiments, as shown in fig. 2 and 4, the gas blowing port 200 is disposed vertically upward to facilitate the flow of molten steel toward the other side of the dam body 100, further facilitating the flow of molten steel in the tundish.

As shown in fig. 6 to 8, the present invention further provides a tundish, which comprises a tundish body 600, a retaining wall 700 is disposed inside the tundish body 600, a flow channel 800 is formed between the retaining wall 700 and the bottom of the tundish body 600, an inflatable dam according to the above embodiments is disposed on the downstream side of the retaining wall 700, the inflatable dam is disposed at the bottom of the tundish body 600, and a pipeline connector 900 communicated with an air inlet 300 of the inflatable dam is disposed on the surface of the tundish body 600. The line connection 900 is connected to a gas source to provide blowing conditions for the inflatable dam. In FIG. 7, long arrows indicate the molten steel flow direction, and short arrows indicate the blowing direction.

According to the inflatable dam and the tundish provided by the embodiment of the utility model, the air inlet 300 is inflated from the outside of the tundish, the air is exhausted from the air blowing port 200 through the air chamber 400, the air blowing port 200 blows air to effectively drive the molten steel near the upstream surface 110 and the downstream surface 120 of the dam body 100 to flow, the molten steel flow field near the dam body 100 is effectively improved, the defect that the molten steel is difficult to flow in a dead zone near the traditional dam is avoided, the dead zone volume is reduced, the molten steel purification capability of the tundish is effectively improved, the non-metallic inclusion in steel can be removed more thoroughly, and the steel quality is improved.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a dam can blow, its characterized in that, includes dam body (100), dam body (100) have incident surface (110) and back of the body flow surface (120), incident surface (110) with back of the body flow surface (120) slope sets up, incident surface (110) with the surface of back of the body flow surface (120) is equipped with gas blowing mouth (200) respectively, dam body (100) inside is equipped with air chamber (400), air chamber (400) intercommunication gas blowing mouth (200), dam body (100) side is equipped with air inlet (300), air inlet (300) intercommunication air chamber (400).

2. The inflatable dam of claim 1, wherein the air blowing openings (200) are strip-shaped through holes horizontally arranged on the incident flow surface (110) and the back flow surface (120), and both ends of the air blowing openings (200) extend to the edges of the incident flow surface (110) and the back flow surface (120).

3. The inflatable dam of claim 2, wherein the plurality of outlets (200) are spaced along the surface of the incident flow surface (110) and the back flow surface (120), and the plurality of outlets (200) are arranged in a gradient manner.

4. The inflatable dam of claim 1, wherein an air permeable block (500) is embedded within the inflation port (200), the air permeable block (500) having an air hole therethrough.

5. An inflatable dam according to claim 4 wherein said gas permeable block (500) is a dispersed pore structure cast of refractory material having a porosity greater than or equal to 30%.

6. The inflatable dam of claim 1, wherein the air chamber (400) and the air inlet (300) are provided in plurality, and each of the air chamber (400), the air inlet (300) and the air blowing port (200) are in one-to-one correspondence.

7. An inflatable dam according to claim 1, wherein there is one air chamber (400) and one air inlet (300), respectively, the air chamber (400) communicating the blowing openings (200) on the incident flow surface (110) and the back flow surface (120).

8. An inflatable dam according to claim 1, characterized in that the cross-section of the dam body (100) in the flow direction is trapezoidal or triangular.

9. An inflatable dam according to claim 1, characterized in that the blowing opening (200) is arranged vertically upwards.

10. A tundish, comprising a tundish body, wherein a retaining wall (700) is arranged inside the tundish body (600), a flow channel (800) is formed between the retaining wall (700) and the bottom of the tundish body (600), an inflatable dam according to any one of claims 1 to 9 is arranged on the downstream side of the retaining wall (700), and a pipeline interface (900) communicated with an air inlet (300) of the inflatable dam is arranged on the surface of the tundish body (600).