Device and method for folding molten steel into torpedo ladle from steel ladle

Abstract

The invention provides a device and method for folding molten steel into a torpedo ladle from a steel ladle, the device comprises a bottom plate, the front part of the bottom plate is connected with the lower part of a front side plate, the rear part of the bottom plate is connected with the lower part of a rear side plate, the left side of the bottom plate is connected with the lower part of a left side plate, and the right side of the bottom plate is connected with the lower part of a right side plate; the side edges of the front side plate, the left side plate, the rear side plate and the right side plate are sequentially connected to form a quadrilateral structure, an upper opening of the quadrilateral structure is used for receiving molten steel poured out of a steel ladle, the bottom plate is provided with a vertically-through lower opening, and the lower opening is in butt joint with an iron receiving opening of the torpedo ladle. By developing the molten steel middle flow guide device, the invention provides a mode of folding molten steel in the steel ladle into the torpedo ladle through a steel ladle opening in a short time so as to meet the operation requirements of the process.

Description

Technical Field

[0001] The present invention relates to the technical field of molten steel smelting, and in particular to a device and method for folding molten steel from a ladle into a torpedo tank. Background Art

[0002] Torpedo ladles are used as transport containers for blast furnace molten iron to the steelmaking process. Their smaller top opening minimizes temperature loss during transportation. Normally, blast furnace molten iron flows from the tapping trough into the torpedo ladles. Because the flow rate is stable and matches the blast furnace tapping, the process avoids spillage and other issues, making this a mature and widely used process.

[0003] In special production scenarios, molten steel needs to be poured into a torpedo tank through a folded ladle opening. For example, when Bengang was developing a process for producing low-carbon emission automotive steel, they needed to pour molten steel after special steel treatment into a torpedo tank through a folded ladle opening. This ensured that 110 tons of molten steel could be formed within 10 minutes to minimize temperature drop during the process. The folding process required stable flow and no iron spillage, ensuring feasibility and safety. Furthermore, they sought to reuse existing ladles and related equipment whenever possible to minimize investment.

[0004] However, there is currently no mature process for pouring molten steel into a torpedo tank through the ladle opening, which makes it difficult to achieve the goal of pouring molten steel into a torpedo tank through the ladle opening. In summary, a method for pouring molten steel into a torpedo tank through the ladle opening is needed. Summary of the Invention

[0005] In view of the technical problem that the existing method cannot pour molten steel into the torpedo tank through the folding method of the ladle mouth, a device and method for folding molten steel from the ladle into the torpedo tank are provided. The present invention mainly utilizes a molten steel diversion device to achieve the operating requirements of the process.

[0006] The technical means adopted in the present invention are as follows: A device for folding molten steel from a ladle into a torpedo tank comprises a bottom plate, wherein the front portion of the bottom plate is connected to the lower portion of a front side plate, the rear portion of the bottom plate is connected to the lower portion of a rear side plate, the left side of the bottom plate is connected to the lower portion of a left side plate, and the right side of the bottom plate is connected to the lower portion of a right side plate. The side edges of the front side plate, the left side plate, the rear side plate, and the right side plate are sequentially connected to form a quadrilateral structure. The upper opening of the quadrilateral structure is used to receive molten steel poured from the ladle. A lower opening is provided on the bottom plate, which is connected from top to bottom and is connected to the iron receiving port of the torpedo tank.

[0007] Furthermore, the front side panels and the rear side panels are inclined outward from bottom to top.

[0008] Furthermore, trunnions are provided on the outer sides of the front side plate and the rear side plate.

[0009] Furthermore, the exterior of the device for folding molten steel from a ladle into a torpedo tank is a steel shell, and the interior of the device for folding molten steel from a ladle into a torpedo tank is cast and formed by high-temperature resistant material.

[0010] Furthermore, wide support edges are provided on the outer upper portions of the left and right panels.

[0011] The present invention also provides a method for folding molten steel from a ladle into a torpedo tank, which is implemented based on any of the above-mentioned devices for folding molten steel from a ladle into a torpedo tank, comprising the following steps: S1, baking the guide device; S2. Use an overhead crane to lift the diversion device onto the fixed frame and place it firmly; S3. Drive the torpedo tank car under the guide device so that the lower opening of the guide device is facing the iron receiving port of the torpedo tank. Check the iron receiving port of the torpedo tank to confirm that there is no slag that affects the pouring of molten steel; S4. Hoist the processed ladle above the guide device, align the ladle opening with the upper opening of the guide device, and ensure that the ladle does not shake left and right to affect the steel breakage; S5. The auxiliary hook of the lifting ladle pours the molten steel into the guide device, and the outflow of the ladle is controlled by the lifting amount of the auxiliary hook; S6. Confirm that the molten steel flows smoothly into the torpedo tank until all the steel folding is completed.

[0012] Furthermore, in S1, after baking, the temperature of the guide device is greater than 800°C.

[0013] Compared with the prior art, the present invention has the following advantages: The present invention develops a molten steel intermediate guide device and provides a method for folding the molten steel in the ladle into the torpedo tank in a short time through the ladle mouth, so as to achieve the operation requirements of the process.

[0014] The present invention makes full use of existing ladle and baking process facilities to complete the function of folding molten steel from the ladle into the torpedo tank, with low overall investment; the device of the present invention occupies a small area; the device of the present invention does not cause iron spillage during the folding process, and has high safety; the device of the present invention shortens the folding process, allows for stable operation, and ensures that 110 tons of molten steel can be folded within 10 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 It is the front view of the present invention.

[0017] Figure 2 It is a side view of the present invention.

[0018] Figure 3 It is a top view of the present invention.

[0019] In the figure: 1, bottom plate; 2, front side plate; 3, rear side plate; 4, left side plate; 5, right side plate; 6, lower opening; 7, ear axis; 8, wide support edge. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0025] For ease of description, spatially relative terms such as "above," "above," "on the upper surface of," and "above" may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "on top of" another device or structure would then be positioned as "below" or "below" the other device or structure. Thus, the exemplary term "above" may include both the orientations of "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used herein should be interpreted accordingly.

[0026] like Figure 1-3As shown, the present invention provides a device for folding molten steel from a ladle into a torpedo tank, comprising a bottom plate 1, wherein the front portion of the bottom plate 1 is connected to the lower portion of the front side plate 2, and the rear portion of the bottom plate 1 is connected to the lower portion of the rear side plate 3. The front side plate 2 and the rear side plate 3 are inclined outward from bottom to top. The left side of the bottom plate 1 is connected to the lower portion of the left side plate 4, and the right side of the bottom plate 1 is connected to the lower portion of the right side plate 5. Ear shafts 7 are provided on the outer sides of the front side plate 2 and the rear side plate 3. A wide support edge 8 is provided on the outer upper portion of the left side plate 4 and the right side plate 5. The side edges of the front side plate 2, the left side plate 4, the rear side plate 3, and the right side plate 5 are connected in sequence to form a quadrilateral structure. The upper opening of the quadrilateral structure is used to receive the molten steel poured from the ladle. The bottom plate 1 is provided with a lower opening 6 that passes through from top to bottom, and the lower opening 6 is connected to the iron receiving port of the torpedo tank. The device has a ladle-like structure that can accommodate a certain amount of molten steel. It serves as a flexible link to match the short-term inconsistency between the molten steel flow rate of the ladle and the molten steel flow rate of the torpedo tank. The guide device is designed with a trunnion 7 to ensure that it can be lifted and placed on a fixed frame. The device is made of a steel shell structure on the outside and cast with high-temperature resistant materials on the inside to ensure the device's resistance to high-temperature molten steel. The guide device uses a special elevated stand and can be baked at the existing ladle baking position. Through baking, it is ensured that the refractory temperature is at 800℃ before the guide device is connected to the steel.

[0027] A method for folding molten steel from a ladle into a torpedo tank comprises the following steps: S1. Bake the guide device; after baking, the temperature of the guide device is greater than 800°C. S2. Use an overhead crane to lift the diversion device onto the fixed frame and place it firmly; S3. Drive the torpedo tank car under the guide device so that the lower opening 6 of the guide device is facing the iron receiving port of the torpedo tank. Check the iron receiving port of the torpedo tank to confirm that there is no slag that affects the pouring of molten steel; S4. Hoist the processed ladle above the guide device, align the ladle opening with the upper opening of the guide device, and ensure that the ladle does not shake left and right to affect the steel breakage; S5. The auxiliary hook of the lifting ladle pours the molten steel into the guide device, and the outflow of the ladle is controlled by the lifting amount of the auxiliary hook; S6. Confirm that the molten steel flows smoothly into the torpedo tank until all the steel folding is completed.

[0028] Example 1 The CR340LA-GI steel grade is produced using a low-carbon emission process, and the molten steel after the first heat of special steel LF is folded into a torpedo tank.

[0029] The specific steps are as follows: 1. Since this is the first time to fold the ladle, the molten steel guide device is preheated to 810℃ before receiving the molten steel.

[0030] 2. Use an overhead crane to lift the diversion device onto the fixed frame at the receiving position.

[0031] 3. Drive the torpedo tank truck under the diversion device so that the lower end of the diversion device faces the opening of the torpedo tank.

[0032] 4. Hang the LF treated ladle on the guide device to stabilize the ladle.

[0033] 5. Discount time: The folding started at 11:21:19 and was completed at 11:29:25. The total folding time was 8 minutes and 6 seconds.

[0034] 6. During the folding process, the molten steel flows down from the guide device in full flow, and there is no splashing during the folding process.

[0035] 7. Before folding, the amount of molten iron in the torpedo tank is 170 tons, the molten iron temperature is 1461℃, the molten steel LF temperature in the special steel ladle is 1621℃, the molten steel amount is 115 tons, and the half steel amount after folding is 285 tons, the half steel temperature is 1510℃. By conversion, it can be concluded that the temperature drop of the molten steel during the folding process is 37℃.

[0036] Example 2 The CR340LA-GI steel grade is produced using a low-carbon emission process, and the molten steel after the second heat of special steel LF is folded into a torpedo tank.

[0037] The specific steps are as follows: 1. Continuous steel folding, the temperature of the guide device before receiving the molten steel is 988℃.

[0038] 2. Drive the torpedo tank truck under the diversion device so that the lower end of the diversion device faces the opening of the torpedo tank.

[0039] 3. Lift the LF ladle out of the station onto the diversion device to stabilize the ladle.

[0040] 4. Discount time: The folding started at 11:35:21 and was completed at 11:39:56. The total folding time was 4 minutes and 35 seconds.

[0041] 5. During the folding process, the molten steel flows down from the guide device in full flow, and there is no splashing during the folding process.

[0042] 6. Before folding, the amount of molten iron in the torpedo tank is 285 tons, the molten iron temperature is 1509℃, the molten steel LF temperature in the special steel ladle is 1561℃, the molten steel amount is 61 tons, and the half steel amount after folding is 246 tons, the half steel temperature is 1514℃. By conversion, it can be concluded that the temperature drop of the molten steel during the folding process is 25℃.

[0043] Example 3 The St04Z steel grade is produced using a low-carbon emission process, and the molten steel is folded into a torpedo tank after special steel LF.

[0044] The specific steps are as follows: 1. Since this is the first time to fold the ladle after a long time, the molten steel guide device is preheated to 821℃ before receiving the molten steel.

[0045] 2. Use an overhead crane to lift the diversion device onto the fixed frame at the receiving position.

[0046] 3. Drive the torpedo tank truck under the diversion device so that the lower end of the diversion device faces the opening of the torpedo tank.

[0047] 4. Hang the LF treated ladle on the guide device to stabilize the ladle.

[0048] 5. Discount time: The folding started at 12:26:07 and was completed at 12:32:15. The total folding time was 6 minutes and 8 seconds.

[0049] 6. During the folding process, the molten steel flows down from the guide device in full flow, and there is no splashing during the folding process.

[0050] 7. Before folding, the amount of molten iron in the torpedo tank is 218 tons, the molten iron temperature is 1459℃, the molten steel LF temperature in the special steel ladle is 1588℃, the molten steel amount is 120 tons, and the half steel amount after folding is 338 tons, the half steel temperature is 1493℃. Through conversion, it can be concluded that the temperature drop of the molten steel during the folding process is 34℃.

[0051] It can be seen from actual production that the guide device can quickly fold the molten steel in the ladle into the torpedo tank. The folding process is short and splash-free. The steel flow into the torpedo tank is full flow. The temperature drop during the entire folding process is between 30-40°C, which meets the process requirements.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for folding molten steel from a ladle into a torpedo tank, characterized in that: The invention comprises a bottom plate (1), wherein the front portion of the bottom plate (1) is connected to the lower portion of the front side plate (2), the rear portion of the bottom plate (1) is connected to the lower portion of the rear side plate (3), the left side of the bottom plate (1) is connected to the lower portion of the left side plate (4), and the right side of the bottom plate (1) is connected to the lower portion of the right side plate (5). The side edges of the front side plate (2), the left side plate (4), the rear side plate (3), and the right side plate (5) are sequentially connected to form a quadrilateral structure. The upper opening of the quadrilateral structure is used to receive molten steel poured out of a ladle. The bottom plate (1) is provided with a lower opening (6) which is through-through from top to bottom, and the lower opening (6) is connected to the iron port of the torpedo tank.

2. The device for folding molten steel from a ladle into a torpedo tank according to claim 1, characterized in that: The front side plate (2) and the rear side plate (3) are inclined outward from bottom to top.

3. The device for folding molten steel from a ladle into a torpedo tank according to claim 1, characterized in that: Ear shafts (7) are provided on the outer sides of the front side plate (2) and the rear side plate (3).

4. The device for folding molten steel from a ladle into a torpedo tank according to claim 1, characterized in that: The outer portion of the device for folding molten steel from a ladle into a torpedo tank is a steel shell, and the inner portion of the device for folding molten steel from a ladle into a torpedo tank is cast and formed by high-temperature resistant materials.

5. The device for folding molten steel from a ladle into a torpedo tank according to claim 1, characterized in that: A wide support edge (8) is provided on the outer upper portions of the left side plate (4) and the right side plate (5).

6. A method for folding molten steel from a ladle into a torpedo tank, which is realized based on the device for folding molten steel from a ladle into a torpedo tank according to any one of claims 1 to 5, characterized in that: The steps include: S1, baking the guide device; S2. Use an overhead crane to lift the diversion device onto the fixed frame and place it firmly; S3. Drive the torpedo tank car under the guide device so that the lower opening (6) of the guide device is facing the iron receiving port of the torpedo tank. Check the iron receiving port of the torpedo tank to confirm that there is no slag that affects the pouring of molten steel; S4. Hoist the processed ladle above the guide device, align the ladle opening with the upper opening of the guide device, and ensure that the ladle does not shake left and right to affect the steel breakage; S5. The auxiliary hook of the lifting ladle pours the molten steel into the guide device, and the outflow of the ladle is controlled by the lifting amount of the auxiliary hook; S6. Confirm that the molten steel flows smoothly into the torpedo tank until all the steel folding is completed.

7. The method for transferring molten steel from a ladle into a torpedo tank according to claim 6, characterized in that: In S1, after baking, the temperature of the guide device is greater than 800°C.

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