Long nozzle for continuous casting of steel ladle

Abstract

The steel ladle continuous casting long nozzle comprises a long nozzle body and a sealing structure, the long nozzle body is a rotating body and comprises a first end and a second end which are oppositely arranged, the diameter size of the long nozzle body is increased in the direction from the second end to the first end, and the long nozzle body further comprises a molten steel channel penetrating through the long nozzle body; the molten steel channel comprises a first straight-through section and a first inlet section which are sequentially arranged in the direction from the second end to the first end, and the first inlet section is used for being sealed with a steel ladle collector nozzle. The sealing structure is made of air bricks, and the sealing structure surrounds the first inlet section on one side of the first end. According to the ladle continuous casting long nozzle provided by the embodiment of the invention, through the sealing structure made of the air bricks, sealing is formed between the ladle collector nozzle and the first inlet section, the inert gas used for assisting sealing can fill small gaps in the air bricks, and the better sealing effect is achieved while the amount of the needed inert gas is small.

Description

Technical Field

[0001] The present application relates to the technical field of steel metallurgy, and in particular to a long nozzle for ladle continuous casting. Background Art

[0002] Currently, immersion pouring through a shroud is a common technique used in continuous steel casting. Molten steel flows from the ladle through the shroud cavity into the tundish. The shroud protects the molten steel from secondary oxidation, prevents splashing, and improves casting safety. The shroud and the ladle outlet are connected by refractory material, making sealing difficult. Existing technologies typically use inert gas for auxiliary sealing. However, current inert gas sealing solutions are either difficult to guarantee sealing or complex in design and difficult to manufacture. Utility Model Content

[0003] An embodiment of the present application provides a ladle continuous casting nozzle, which can improve the sealing effect between the long nozzle and the ladle lower nozzle.

[0004] In the first aspect, according to an embodiment of the present application, a long shroud for continuous casting of a ladle is provided, comprising: a long shroud body, the long shroud body being a rotating body, comprising a first end and a second end arranged opposite to each other, the diameter of the long shroud body increasing in the direction from the second end to the first end, the long shroud body also comprising a molten steel channel arranged through itself, the molten steel channel comprising a first straight-through section and a first inlet section arranged in sequence from the second end to the first end, the first inlet section being used to seal with the lower shroud of the ladle; a sealing structure made of air-permeable bricks is arranged around the first inlet section on one side of the first end.

[0005] According to one aspect of an embodiment of the present application, the sealing structure further includes a second inlet section running through the sealing structure, and the diameter of the first inlet section is consistent with the diameter of the second inlet section on a side close to the first inlet section.

[0006] According to one aspect of an embodiment of the present application, a protective layer is further included, which wraps a portion of the long nozzle body and a portion of the sealing structure.

[0007] According to one aspect of the embodiment of the present application, the breathable structure further includes an air inlet, which is connected to the second inlet section.

[0008] According to one aspect of the embodiment of the present application, the air inlet penetrates the protective layer.

[0009] According to one aspect of the embodiment of the present application, the air inlet penetrates the protective layer and the air-permeable brick.

[0010] According to one aspect of an embodiment of the present application, the second inlet section includes a first sub-section and a second sub-section arranged in sequence away from the first inlet section, the diameter sizes of the first sub-section and the second sub-section increase in the direction away from the first inlet section, and the diameter sizes of the second sub-section and the first sub-section on the connected side remain consistent.

[0011] According to one aspect of the embodiment of the present application, the second sub-segment further includes a ventilation groove arranged around its circumference, and the ventilation groove is connected to the inner wall and the outer wall of the second sub-segment.

[0012] According to one aspect of an embodiment of the present application, the side wall of the first inlet section includes a first opening, a first side wall, a second side wall and a second opening connected in sequence along the direction from the second end to the first end, the diameter size of the first opening is consistent with the diameter size of the first straight section, the first side wall and the first opening are located in the same plane, and the first side wall is used to abut against the ladle drain.

[0013] According to one aspect of an embodiment of the present application, the molten steel channel also includes a third inlet section and a second straight-through section, and the third inlet section and the second straight-through section are arranged in sequence along the direction from the first end to the second end on the side of the first straight-through section away from the first inlet section. The diameter of the second straight-through section is larger than the diameter of the first straight-through section. The diameter of the third inlet section is consistent with that of the first straight-through section and the second straight-through section on the connected side, and the third inlet section gradually increases along the direction from the first straight-through section to the second straight-through section.

[0014] The ladle continuous casting nozzle provided in the embodiment of the present application forms a seal between the ladle outlet and the first inlet section through a sealing structure made of air-permeable bricks. The inert gas used for auxiliary sealing can fill the tiny gaps inside the air-permeable bricks. The required amount of inert gas is small, while achieving a better sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic cross-sectional view of a long shroud for ladle continuous casting according to an embodiment of the first aspect of the present application;

[0017] Figure 2 It is a schematic cross-sectional structural diagram of the ladle continuous casting shroud and the ladle outlet provided in the embodiment of the first aspect of the present application;

[0018] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of region A;

[0019] Figure 4 This is a top view of the long nozzle for ladle continuous casting provided in the embodiment of the first aspect of the present application.

[0020] in:

[0021] 100-Long nozzle for ladle continuous casting;

[0022] 10- shroud body; 10a- first end; 10b- second end;

[0023] 11-molten steel channel; 111-first inlet section; 111a-first opening; 111b-first side wall; 111c-second side wall; 111d-second opening; 112-first straight section; 113-third inlet section; 114-second straight section;

[0024] 20 - sealing structure; 21 - second inlet section; 21a - first subsection; 21b - second subsection; 22 - air inlet; S1 - air permeability groove;

[0025] 30-Protective layer.

[0026] In the drawings, like parts are given like reference numerals, but the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are set forth in order to provide a comprehensive understanding of the present application. However, it will be apparent to those skilled in the art that the present application can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the well-known structures and technologies are not shown in order to avoid unnecessary ambiguity in the present application; and, for clarity, the sizes of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements limited by the sentence "comprise..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0029] The directional words appearing in the following description are all directions shown in the figures and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0030] Figure 1 The cross-sectional structure of the ladle continuous casting shroud 100 provided by the first embodiment of the present application is shown. Figure 2 The cross-sectional structure of the ladle continuous casting long nozzle 100 and the ladle lower nozzle provided in the embodiment of the first aspect of the present application is shown.

[0031] See also Figure 1 and Figure 2 In a first aspect, an embodiment of the present application provides a ladle continuous casting shroud 100 , comprising a shroud body 10 and a sealing structure 20 .

[0032] The shroud body 10 is a rotating body, including a first end 10a and a second end 10b arranged opposite to each other. The diameter of the shroud body 10 increases in the direction from the second end 10b to the first end 10a. The shroud body 10 also includes a molten steel channel 11 arranged through itself. The molten steel channel 11 includes a first straight-through section 112 and a first inlet section 111 arranged in sequence from the second end 10b to the first end 10a. The first inlet section 111 is used to seal with the lower shroud of the ladle.

[0033] The sealing structure 20 is made of air-permeable bricks and is disposed around the first inlet section 111 on one side of the first end 10 a .

[0034] The long water nozzle 100 for continuous casting of a ladle provided in the embodiment of the first aspect of the present application forms a seal between the ladle water outlet and the first inlet section 111 through a sealing structure 20 made of breathable bricks. The inert gas used for auxiliary sealing can fill the tiny gaps inside the breathable bricks. While the required amount of inert gas is small, a better sealing effect is achieved.

[0035] The ladle outlet is sealed with the first inlet section 111 on one side of the first end 10a, so that the molten steel can flow out of the ladle outlet, continue along the molten steel channel 11, and continue to flow from the first straight section 112 into the molten steel in the tundish in the subsequent continuous casting process.

[0036] The sealing effect can be further enhanced by providing a sealing structure 20 around one side of the first end portion 10a.

[0037] The sealing structure 20 is made of breathable bricks, and a plurality of gaps of different sizes and dimensions that penetrate each other are provided inside the breathable bricks. The extension direction of the gaps can be reasonably designed according to actual needs. In the sealing structure 20, the gaps extend in the sealing structure 20 to connect the inner and outer sides of the sealing structure 20.

[0038] The air bricks can use the internal gaps to form a channel structure, blowing inert gas from the outside of the sealing structure 20 into the inside. The inert gas does not need to completely surround the position where the first inlet section 111 cooperates with the ladle outlet. It only needs to fill the gaps in the air bricks of the sealing structure 20, and the required amount of inert gas is small.

[0039] At the same time, in addition to being directly sealed on the inner side of the sealing structure 20, even if part of the molten steel flows from the inner side of the sealing structure 20 into the gap between the air-permeable bricks of the sealing structure 20, the channel structure formed in the gap is also filled with inert gas near the outer side of the sealing structure 20, and the sealing effect is better.

[0040] The sealing structure 20 is made of breathable bricks, which also have good high-temperature corrosion resistance, high-temperature wear resistance and thermal shock resistance.

[0041] Optionally, the inert gas is argon.

[0042] Optionally, the diameter of the first end portion 10a is 261 mm to 265 mm, the diameter of the second end portion 10b is 200 mm, and the length of the shroud body 10 is 300 mm.

[0043] Optionally, the diameter of the first straight section 112 is 110 mm, and the diameter of the first inlet section 111 is 157 mm.

[0044] Optionally, the length of the first inlet section 111 is 20 mm, and the length of the first straight section 112 is 280 mm.

[0045] Optionally, the thickness of the sealing structure 20 is 50 mm, and the diameter of the sealing structure 20 is consistent with the diameter of the first end portion 10 a.

[0046] Figure 3 Shown Figure 1 A region in the image is enlarged.

[0047] In some embodiments, the sealing structure 20 further includes a second inlet section 21 penetrating the sealing structure 20 , and the diameter of the first inlet section 111 is consistent with the diameter of the second inlet section 21 on a side close to the first inlet section 111 .

[0048] In these embodiments, the second inlet section 21 of the sealing structure 20 is connected and matched with the first inlet section 111 of the shroud body 10 to further improve the sealing effect.

[0049] Please continue reading Figure 1 In some embodiments, a protective layer 30 is further included, and the protective layer 30 wraps a portion of the long nozzle body 10 and the sealing structure 20.

[0050] In these embodiments, the protective layer 30 wraps the shroud body 10 and the sealing structure 20 to make the shroud body 10 and the sealing structure 20 fit more closely. While supporting the shroud body 10 and the sealing structure 20, the provision of the protective layer 30 can further enhance the sealing effect.

[0051] In the related art, a certain amount of gap needs to be reserved between the protective layer 30 and the long nozzle body 10 so that the inert gas rushing into between the protective layer 30 and the long nozzle body 10 can surround and fill the entire gap, forming a sealing ring, and allowing the inert gas to be retained for a longer time. However, the required amount of inert gas is large, and the gap between the protective layer 30 and the long nozzle body 10 makes the supporting effect of the protective layer 30 weaker.

[0052] However, in the embodiment of the present application, there is no need to reserve a gap between the protective layer and the long nozzle body. The inert gas is filled into the tiny gap in the breathable brick material of the sealing structure to form a complete auxiliary seal. The inert gas can be retained for a long time, the supporting effect of the protective layer is better, and it can further help improve the sealing effect.

[0053] Optionally, the protective layer 30 is made of an iron shell.

[0054] Please continue reading Figure 1 In some embodiments, the sealing structure 20 further includes an air inlet 22 , which is communicated with the second inlet section 21 .

[0055] In these embodiments, the air inlet 22 is used to transport inert gas. The air inlet 22 is connected to the second inlet section 21 . The inert gas transported through the air inlet can form an annular seal of inert gas on one side of the first inlet section 111 .

[0056] Optionally, the air inlet 22 is an external threaded pipe joint with an inner thread diameter of about 15 mm and an outer thread diameter of about 16 mm.

[0057] Optionally, the distance between the air inlet 22 and the side of the sealing structure 20 away from the first end 10a is 27 mm.

[0058] Please continue reading Figure 1 In some embodiments, the air inlet 22 penetrates the protective layer 30 .

[0059] In these embodiments, after the air inlet 22 passes through the protective layer 30, it is connected to the second inlet section 21 through the internal gap of the sealing structure 20. The inert gas first fills the internal gap of the sealing structure 20 and then forms an annular seal of the inert gas on one side of the first inlet section 111.

[0060] In some embodiments, the air inlet 22 penetrates the protective layer 30 and the air brick.

[0061] In these embodiments, after the air inlet 22 passes through the protective layer 30 and the air-permeable brick, the air inlet 22 is directly connected to the second inlet section 21, first forming an annular seal of inert gas on one side of the first inlet section 111, and then filling the internal gap of the sealing structure 20 to further improve the sealing effect.

[0062] Please continue reading Figure 3 In some embodiments, the second inlet section 21 includes a first sub-segment 21a and a second sub-segment 21b arranged in sequence in a direction away from the first inlet section 111. The diameters of the first sub-segment 21a and the second sub-segment 21b increase in a direction away from the first inlet section 111, and the diameters of the second sub-segment 21b and the first sub-segment 21a on the connected side remain consistent.

[0063] In these embodiments, while the first sub-segment 21a and the second sub-segment 21b are connected, the second sub-segment 21b is used to achieve pre-alignment with the ladle outlet, making docking easier.

[0064] Optionally, the size of the first subsegment 21a close to the first inlet section 111 is 157 mm, the diameter of the second subsegment 21b on the side connected to the first subsegment 21a is 173 mm, and the diameter of the second subsegment 21b away from the first subsegment 21a is 188 mm.

[0065] Optionally, the depth of the first sub-segment 21a is 42 mm, and the depth of the second sub-segment 21b is 8 mm.

[0066] Figure 4 The top view structure of the long shroud 100 for continuous casting of a ladle provided in an embodiment of the first aspect of the present application is shown.

[0067] Please continue reading Figure 4 In some embodiments, the second sub-segment 21b further includes a breathable groove S1 arranged around its circumference, and the breathable groove S1 is connected to the inner wall and the outer wall of the second sub-segment 21b.

[0068] In these embodiments, the second subsection 21b is further provided with a breathable groove S1, and the inert gas also forms an annular seal on the side of the second subsection 21b away from the first subsection 21a, further improving the sealing effect.

[0069] In addition to forming an annular seal on one side of the inner side of the sealing structure 20, the inert gas can pass through the gap inside the sealing structure 20 and the breathable groove S1 to form a new annular seal on the inner and outer sides of the sealing structure 20, further improving the sealing effect.

[0070] Optionally, the second subsection 21 b is provided with 12 evenly arranged ventilation slots S1 , and the width of the ventilation slots S1 is 18 mm.

[0071] Please continue reading Figures 1 to 3 In some embodiments, the side wall of the first inlet section 111 includes a first opening 111a, a first side wall 111b, a second side wall 111c, and a second opening 111d, which are sequentially connected along the direction from the second end 10b to the first end 10a. The diameter of the first opening 111a is consistent with the diameter of the first straight section 112. The first side wall 111b and the first opening 111a are located in the same plane. The first side wall 111b is used to abut against the ladle outlet.

[0072] In these embodiments, the first inlet section 111 is connected to the first straight section 112 through the first opening 111a, and the ladle outlet is directly connected to the first side wall 111b in a planar manner. The arrangement of the first side wall 111b and the second side wall 111c extends the sealing path between the ladle outlet and the side wall of the molten steel channel 11, further improving the sealing effect.

[0073] The ladle water outlet is directly connected to the first side wall 111b in a planar manner, which can also help the operator confirm that the ladle water outlet is fully embedded in the molten steel channel 11. The first side wall 111b is in contact with the ladle water outlet, which can confirm that the ladle continuous casting long water outlet 100 is installed, thereby improving the installation efficiency.

[0074] Optionally, the diameter of the first opening 111a is 110 mm. Figure 1 In some embodiments, the molten steel channel 11 further includes a third inlet section 113 and a second straight section 114. The third inlet section 113 and the second straight section 114 are sequentially arranged along the direction from the first end 10a to the second end 10b on the side of the first straight section 112 away from the first inlet section 111. The diameter of the second straight section 114 is larger than the diameter of the first straight section 112. The diameter of the third inlet section 113 is consistent with that of the first straight section 112 and the second straight section 114 on the connected side, and the third inlet section 113 gradually increases along the direction from the first straight section 112 to the second straight section 114.

[0075] In these embodiments, the molten steel channel 11 adopts a gradually expanding design on the side of the first straight section 112 near the second end 10b, so that the flow rate of the molten steel can be controlled to decrease when the molten steel passes through the molten steel channel 11 into the molten steel in the continuous casting ladle, thereby reducing the impact force on the side wall of the molten steel channel 11, reducing vibration and noise, and preventing the molten steel from splashing due to impact when the molten steel enters the molten steel surface in the continuous casting ladle, thereby ensuring production safety.

[0076] Optionally, the outer side wall of the shroud body 10 at part of the second straight-through section 114 is also provided with special protective material, which is used to protect the refractory material of the shroud body 10 and prevent the waste slag on the molten steel surface from reacting with the refractory material of the shroud body 10 to form low-melting-point compounds in the immersion section of the molten steel in the continuous casting tundish, and the low-melting-point compounds from peeling off under the subsequent molten steel flushing, resulting in the risk of serious erosion or even damage to the shroud body 10.

[0077] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A ladle continuous casting shroud, characterized in that: include: A shroud body, which is a rotating body and includes a first end and a second end disposed opposite to each other. The diameter of the shroud body increases from the second end to the first end. The shroud body also includes a molten steel channel extending therethrough. The molten steel channel includes a first straight-through section and a first inlet section sequentially disposed from the second end to the first end. The first inlet section is used to seal with the ladle outlet. A sealing structure made of air-permeable bricks is arranged around the first inlet section on one side of the first end.

2. The ladle continuous casting shroud according to claim 1, characterized in that: The sealing structure further includes a second inlet section penetrating the sealing structure, and the diameter of the first inlet section is consistent with the diameter of the second inlet section on a side close to the first inlet section.

3. The ladle continuous casting shroud according to claim 2, characterized in that: It also includes a protective layer, which wraps part of the long nozzle body and part of the sealing structure.

4. The ladle continuous casting shroud according to claim 3, characterized in that: The sealing structure further includes an air inlet, which is communicated with the second inlet section.

5. The ladle continuous casting shroud according to claim 4, characterized in that: The air inlet penetrates the protective layer.

6. The ladle continuous casting shroud according to claim 5, characterized in that: The air inlet passes through the protective layer and the air-permeable brick.

7. The ladle continuous casting shroud according to claim 2, characterized in that: The second inlet section includes a first sub-section and a second sub-section arranged in sequence away from the first inlet section. The diameters of the first sub-section and the second sub-section increase in the direction away from the first inlet section, and the diameters of the second sub-section and the first sub-section on the connected side remain consistent.

8. The ladle continuous casting shroud according to claim 7, characterized in that: The second sub-segment further includes a ventilation groove arranged around its circumference, and the ventilation groove is connected to the inner wall and the outer wall of the second sub-segment.

9. The ladle continuous casting shroud according to claim 1, characterized in that: The side wall of the first inlet section includes a first opening, a first side wall, a second side wall and a second opening connected in sequence along the direction from the second end to the first end. The diameter of the first opening is consistent with the diameter of the first straight-through section. The first side wall and the first opening are located in the same plane. The first side wall is used to abut against the ladle drain.

10. The ladle continuous casting shroud according to claim 9, characterized in that: The molten steel channel also includes a third inlet section and a second straight-through section. The third inlet section and the second straight-through section are arranged in sequence along the direction from the first end to the second end on the side of the first straight-through section away from the first inlet section. The diameter of the second straight-through section is larger than the diameter of the first straight-through section. The diameter of the third inlet section is consistent with the diameter of the first straight-through section and the second straight-through section on the connected side, and the third inlet section gradually increases along the direction from the first straight-through section to the second straight-through section.

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