A ladle refining furnace for processing an alloy steel

Abstract

The utility model relates to the field of steel ladle refining furnace, put forward a kind of alloy steel processing's steel ladle refining furnace, it includes: bottom plate, the top of bottom plate is fixedly connected with support arm, the side of support arm is rotatably connected with pivot, the side of pivot is fixedly connected with refining furnace body, the top of refining furnace body is fixedly connected with dismounting top cover, the inside of refining furnace body is provided with steel ladle refining bottom blowing argon stirring device, the utility model discloses through high-temperature-resistant stirring piece in steel ladle refining bottom blowing argon stirring device adopts high-temperature-resistant alloy material, can long-term resist high-temperature molten steel erosion, the leakage hole of its high-temperature-resistant stirring piece top allows molten steel to pass through stirring piece, makes that stirring resistance greatly reduces, reduces motor energy consumption, breaks local high-intensity vortex simultaneously, avoids molten steel and spatters due to stirring too strong, and gas stirring works in coordination, shorten the time of molten steel composition uniformity.

Description

Technical Field

[0001] This utility model relates to the field of ladle refining furnaces, specifically to a ladle refining furnace for alloy steel processing. Background Technology

[0002] The ladle refining furnace is the core equipment in the ladle refining process of the steel industry. It connects the primary refining furnace with the continuous casting and ingot casting processes. It is mainly used for the purification and quality control of high-quality steel grades such as alloy steel and special steel. It is a key piece of equipment for achieving precise steel composition, improved purity, and uniform temperature in molten steel.

[0003] In existing technologies, insufficient stirring leads to the deposition of high-density alloying elements and local enrichment of components, causing the overall composition of molten steel to deviate beyond tolerance. At the same time, it hinders the floating of inclusions and the escape of harmful gases, resulting in substandard cleanliness of molten steel. It also prolongs the refining cycle, increases energy consumption and rework rate, and significantly drags down production efficiency. Therefore, we propose a ladle refining furnace for alloy steel processing. Utility Model Content

[0004] This utility model proposes a ladle refining furnace for alloy steel processing.

[0005] The technical solution of this utility model is as follows: A ladle refining furnace for alloy steel processing includes: a bottom plate, a support arm fixedly connected to the top of the bottom plate, a rotating shaft rotatably connected to the side of the support arm, a refining furnace body fixedly connected to the side of the rotating shaft, a detachable top cover fixedly connected to the top of the refining furnace body, and a ladle refining bottom blowing argon stirring device provided inside the refining furnace body.

[0006] The ladle refining bottom-blown argon stirring device includes a support plate. The bottom of the support plate is fixedly connected to the top of the disassembly top cover. A motor is fixedly connected to the side of the support plate. A transmission shaft is fixedly connected to the output shaft of the motor. A first gear is fixedly connected to the circumferential surface of the transmission shaft. A stirring shaft is rotatably connected through the top of the disassembly top cover. A second gear is fixedly connected to one end of the stirring shaft. A connecting sleeve is fixedly connected to the other end of the stirring shaft. A fixing block is fixedly connected to the circumferential surface of the connecting sleeve. A high-temperature resistant stirring plate is fixedly connected to the side of the fixing block.

[0007] The high-temperature resistant stirring plate has several perforations on its top, arranged in a linear array. These perforations reduce the resistance of the molten steel during stirring, preventing excessive local eddies that could cause splashing. They also promote vertical convection of the molten steel, making inclusions easier to float and improving the purity of the refined product.

[0008] The second gear meshes with the first gear for transmission, and a permeable brick is fixedly connected to the inner wall of the refining furnace body. The meshing transmission between the second gear and the first gear ensures stable power transmission and avoids jamming of the stirring shaft. The permeable brick on the inner wall of the refining furnace body provides a channel for bottom-blown argon, which, together with the bottom-blown argon stirring device for ladle refining, forms a dual effect of stirring and blowing, accelerating the uniformity of steel composition and the escape of gas.

[0009] The number of high-temperature resistant stirring blades and fixing blocks is set to six, and they are distributed in a circumferential array on the circumferential surface of the connecting sleeve. A graphite electrode column is fixedly connected to the top of the detachable top cover. The six high-temperature resistant stirring blades and fixing blocks are distributed in a circumferential array along the connecting sleeve, which can cover a larger area inside the refining furnace body, reduce the stirring dead zone, and enable the molten steel to heat up. Together with the stirring, they can improve the temperature uniformity and shorten the refining cycle.

[0010] The refining furnace body is equipped with a bottom anti-settling device. The bottom anti-settling device includes a fixing rod, which is fixedly connected to the bottom end of the stirring shaft. One end of the fixing rod is fixedly connected to a fixing connecting block. An arc-shaped scraper is fixedly connected to the side of the fixing connecting block. A rotating shaft is rotatably connected to the top of the arc-shaped scraper. A baffle is fixedly connected to the circumferential surface of the rotating shaft.

[0011] The arc-shaped scraper has arc-shaped grooves on its side. Two arc-shaped scrapers and two baffles are arranged in a circumferential array on the circumferential surface of the fixed connecting block. The arc-shaped grooves on the side of the scraper reduce frictional resistance with the bottom of the refining furnace body during scraping, thus reducing energy consumption. The two arc-shaped scrapers and baffles, distributed along the circumference of the fixed connecting block, ensure full coverage of the bottom and prevent localized deposits.

[0012] A second sub-furnace is fixedly connected to the circumferential surface of the refining furnace body, and a drain hole penetrates the circumferential surface of the second sub-furnace. The second sub-furnace on the refining furnace body can realize the separation of molten steel and water to meet the needs of multi-stage refining. The drain hole of the second sub-furnace can control the transfer speed of molten steel and avoid secondary oxidation caused by excessive flow rate.

[0013] The inner bottom wall of the refining furnace body is arc-shaped, and the number of graphite electrode columns is set to four, which are distributed in a circumferential array on the top of the disassembled top cover. The arc-shaped inner bottom wall of the refining furnace body facilitates the flow and pouring of molten steel, reduces residue, and the four graphite electrode columns distributed in a circumferential array along the disassembled top cover can achieve uniform heating of molten steel, avoid local overheating or insufficient temperature, and ensure the stability of molten steel temperature.

[0014] The working principle and beneficial effects of this utility model are as follows:

[0015] 1. The high-temperature resistant stirring plate in the bottom-blown argon stirring device for ladle refining of this utility model is made of high-temperature resistant alloy material, which can withstand the erosion of high-temperature molten steel for a long time. The leakage hole at the top of the high-temperature resistant stirring plate allows molten steel to pass through the stirring plate, which greatly reduces the stirring resistance and reduces the energy consumption of the motor. At the same time, it breaks the local high-intensity eddy current and avoids the molten steel from splashing due to excessive stirring. Working in conjunction with gas stirring, it shortens the time for the molten steel composition to become uniform.

[0016] 2. This utility model uses an arc-shaped scraper in the bottom anti-settling device to rotate close to the arc-shaped inner bottom wall of the refining furnace body, which can scrape off undissolved alloy particles, inclusions and agglomerates at the bottom. This solves the problem of local composition deviation caused by the dead zone at the bottom of the traditional stirring device, and can effectively prevent viscous molten steel with high alloy content from settling at the bottom, ensuring uniform alloy composition.

[0017] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a structural schematic diagram of the overall appearance of this utility model;

[0020] Figure 2 This is a schematic diagram showing the internal cross-section of the refining furnace body of this utility model;

[0021] Figure 3 This is a schematic diagram of the bottom-blown argon stirring device for ladle refining according to this utility model;

[0022] Figure 4 This is a schematic diagram of the bottom anti-sedimentation device of this utility model;

[0023] Figure 5 This utility model Figure 3 A three-dimensional magnified structural diagram of A.

[0024] In the diagram: 1. Base plate; 2. Support arm; 3. Rotating shaft; 4. Refining furnace body; 5. Ladle refining bottom-blowing argon stirring device; 6. Bottom anti-sedimentation device; 7. Second sub-furnace; 8. Graphite electrode column; 9. Removable top cover; 10. Permeable brick; 11. Drain hole; 51. Support plate; 52. Motor; 53. Drive shaft; 54. First gear; 55. Stirring shaft; 56. Second gear; 57. Connecting sleeve; 58. Fixing block; 59. High-temperature resistant stirring plate; 61. Fixing rod; 62. Fixing connecting block; 63. Arc-shaped scraper; 64. Rotating shaft; 65. Baffle plate; 66. Arc-shaped groove; 510. Drain hole. Detailed Implementation

[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0026] Example 1

[0027] like Figures 1-5 As shown, this embodiment proposes a ladle refining furnace for alloy steel processing, including: a bottom plate 1, a support arm 2 fixedly connected to the top of the bottom plate 1, a rotating shaft 3 rotatably connected to the side of the support arm 2, a refining furnace body 4 fixedly connected to the side of the rotating shaft 3, a detachable top cover 9 fixedly connected to the top of the refining furnace body 4, and a ladle refining bottom blowing argon stirring device 5 provided inside the refining furnace body 4.

[0028] The bottom-blown argon stirring device 5 for ladle refining includes a support plate 51. The bottom of the support plate 51 is fixedly connected to the top of the disassembly top cover 9. A motor 52 is fixedly connected to the side of the support plate 51. A transmission shaft 53 is fixedly connected to the output shaft of the motor 52. A first gear 54 is fixedly connected to the circumferential surface of the transmission shaft 53. A stirring shaft 55 is rotatably connected through the top of the disassembly top cover 9. A second gear 56 is fixedly connected to one end of the stirring shaft 55. A connecting sleeve 57 is fixedly connected to the other end of the stirring shaft 55. A fixing block 58 is fixedly connected to the circumferential surface of the connecting sleeve 57. A high-temperature resistant stirring plate 59 is fixedly connected to the side of the fixing block 58.

[0029] The top of the high-temperature resistant stirring plate 59 is provided with several perforations 510, which are distributed in a linear array on the top of the high-temperature resistant stirring plate 59. The perforations 510 on the top of the high-temperature resistant stirring plate 59 can reduce the resistance of molten steel during stirring, avoid splashing caused by excessive local eddies, and promote the vertical convection of molten steel, making it easier for inclusions to float to the surface and improving the refining purity.

[0030] The second gear 56 meshes with the first gear 54 for transmission, and a permeable brick 10 is fixedly connected to the inner wall of the refining furnace body 4. The meshing transmission between the second gear 56 and the first gear 54 ensures stable power transmission and avoids jamming of the stirring shaft 55. The permeable brick 10 on the inner wall of the refining furnace body 4 provides a channel for bottom-blown argon, and together with the bottom-blown argon stirring device 5 for ladle refining, it forms a dual function of stirring and blowing, accelerating the uniformity of the molten steel composition and the escape of gas.

[0031] The number of high-temperature resistant stirring blades 59 and fixing blocks 58 is set to six, and they are distributed in a circumferential array on the circumferential surface of the connecting sleeve 57. A graphite electrode post 8 is fixedly connected to the top of the disassembled top cover 9. The six high-temperature resistant stirring blades 59 and fixing blocks 58 are distributed in a circumferential array along the connecting sleeve 57, which can cover a larger area inside the refining furnace body 4, reduce the stirring dead zone, and remove the graphite electrode post 8 on the top of the top cover 9 to achieve steel heating. Together with stirring, they can improve temperature uniformity and shorten the refining cycle.

[0032] In this embodiment, when the device is started, the motor 52 is powered on and begins to run. Its output shaft drives the transmission shaft 53 to rotate, and the first gear 54 on the circumferential surface of the transmission shaft 53 rotates accordingly. Since the first gear 54 meshes with the second gear 56 at the top of the stirring shaft 55, the power is transmitted to the stirring shaft 55 through the gear transmission, causing the stirring shaft 55 to rotate synchronously along the through hole of the disassembly top cover 9. The connecting sleeve 57 at the bottom of the stirring shaft 55 rotates with the shaft, driving the circumferential fixing block 58 and the high-temperature resistant stirring plate 59 inside the refining furnace body 4. The molten steel rotates, forming a mechanically stirred flow field. At the same time, the permeable bricks 10 on the inner wall of the refining furnace body 4 blow argon into the molten steel. As the argon bubbles rise in the molten steel, they form a gas stirred flow field. The high-temperature resistant stirring plate 59 rotates and pushes the molten steel to form a composite flow. The top hole 510 allows some molten steel to pass through, reducing stirring resistance and breaking local eddies. As the argon bubbles rise, they carry the gas and small inclusions in the molten steel and diffuse evenly under the action of the stirred flow field. Finally, the bubbles and inclusions float to the slag layer on the surface of the molten steel and are adsorbed and removed.

[0033] Example 2

[0034] like Figures 1-5 As shown, based on the same concept as in Embodiment 1 above, this embodiment also proposes that the refining furnace body 4 is provided with a bottom anti-settling device 6. The bottom anti-settling device 6 includes a fixing rod 61, which is fixedly connected to the bottom end of the stirring shaft 55. One end of the fixing rod 61 is fixedly connected to a fixing connecting block 62. An arc-shaped scraper 63 is fixedly connected to the side of the fixing connecting block 62. A rotating shaft 64 is rotatably connected to the top of the arc-shaped scraper 63. A baffle 65 is fixedly connected to the circumferential surface of the rotating shaft 64.

[0035] The side of the arc-shaped scraper 63 is provided with an arc-shaped groove 66. There are two arc-shaped scrapers 63 and two baffles 65, which are distributed in a circumferential array on the circumferential surface of the fixed connecting block 62. The arc-shaped groove 66 on the side of the arc-shaped scraper 63 can reduce the frictional resistance between the scraper and the bottom of the refining furnace body 4 during scraping, thereby reducing energy consumption. The two arc-shaped scrapers 63 and the baffles 65 are distributed along the circumference of the fixed connecting block 62 to ensure full coverage of the bottom and avoid local deposit residue.

[0036] A second sub-furnace 7 is fixedly connected to the circumferential surface of the refining furnace body 4, and a drain hole 11 penetrates the circumferential surface of the second sub-furnace 7. The second sub-furnace 7 on the refining furnace body 4 can realize the separation of molten steel and water to meet the needs of multi-stage refining. The drain hole 11 of the second sub-furnace 7 can control the transfer speed of molten steel and avoid secondary oxidation caused by excessive flow rate.

[0037] The inner bottom wall of the refining furnace body 4 is arc-shaped, and four graphite electrode columns 8 are arranged in a circumferential array on the top of the disassembled top cover 9. The arc-shaped inner bottom wall of the refining furnace body 4 facilitates the flow and pouring of molten steel, reduces residue, and the four graphite electrode columns 8 arranged in a circumferential array along the disassembled top cover 9 can achieve uniform heating of molten steel, avoid local overheating or insufficient temperature, and ensure the stability of molten steel temperature.

[0038] In this embodiment, when the ladle refining furnace is started and enters the refining stage, the stirring shaft 55 rotates under the drive of the bottom-blown argon stirring device 5 for ladle refining. The bottom anti-settling device 6 starts synchronously with the stirring shaft 55. The fixing rod 61, because it is fixedly connected to the bottom end of the stirring shaft 55, rotates together with the stirring shaft 55, thereby driving the fixed connecting block 62 at one end to make a circular motion. The arc-shaped scraper 63 on the side of the fixed connecting block 62 rotates with it. Because the arc of the arc-shaped scraper 63 is adapted to the arc-shaped inner bottom wall of the refining furnace body 4, it can scrape close to the bottom during the rotation, removing the molten steel deposited at the bottom of the furnace. Deposits such as lumps and high-density alloy particles are scraped up to prevent long-term accumulation and hardening. At the same time, the rotating shaft 64 at the top of the arc-shaped scraper 63 and the circumferential baffle 65 are passively rotated under the action of the molten steel flow. When the baffle 65 rotates, it breaks the local static molten steel flow field at the bottom of the furnace and forms an upward vortex, which entrains the scraped deposits into the main flow field of molten steel. Meanwhile, the arc-shaped groove 66 on the side of the arc-shaped scraper 63 allows some molten steel to pass through, reducing the direct frictional resistance between the scraper and the bottom of the furnace. At the same time, it guides the molten steel to form secondary convection on both sides of the arc-shaped scraper 63, further enhancing the mixing of the molten steel at the bottom.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A ladle refining furnace for alloy steel processing, characterized in that, include: A base plate (1) is fixedly connected to the top of the base plate (1), a support arm (2) is rotatably connected to the side of the support arm (2), a refining furnace body (4) is fixedly connected to the side of the refining furnace body (4), a disassembly top cover (9) is fixedly connected to the top of the refining furnace body (4), and a ladle refining bottom blowing argon stirring device (5) is provided inside the refining furnace body (4). The ladle refining bottom-blown argon stirring device (5) includes a support plate (51), the bottom of which is fixedly connected to the top of the disassembly top cover (9), a motor (52) is fixedly connected to the side of the support plate (51), a transmission shaft (53) is fixedly connected to the output shaft of the motor (52), a first gear (54) is fixedly connected to the circumferential surface of the transmission shaft (53), a stirring shaft (55) is rotatably connected through the top of the disassembly top cover (9), a second gear (56) is fixedly connected to one end of the stirring shaft (55), a connecting sleeve (57) is fixedly connected to the other end of the stirring shaft (55), a fixing block (58) is fixedly connected to the circumferential surface of the connecting sleeve (57), and a high-temperature resistant stirring plate (59) is fixedly connected to the side of the fixing block (58).

2. The ladle refining furnace for alloy steel processing according to claim 1, characterized in that, The top of the high-temperature resistant stirring plate (59) is provided with a leakage hole (510), and the number of the leakage holes (510) is set to several, and they are distributed in a linear array on the top of the high-temperature resistant stirring plate (59).

3. The ladle refining furnace for alloy steel processing according to claim 2, characterized in that, The second gear (56) meshes with the first gear (54) for transmission, and the inner wall of the refining furnace body (4) is fixedly connected with a breathable brick (10).

4. The ladle refining furnace for alloy steel processing according to claim 3, characterized in that, The number of the high-temperature resistant stirring plate (59) and the fixing block (58) are both set to six, and they are distributed in a circumferential array on the circumferential surface of the connecting sleeve (57). The top of the disassembly top cover (9) is fixedly connected with a graphite electrode column (8).

5. A ladle refining furnace for alloy steel processing according to claim 4, characterized in that, The refining furnace body (4) is equipped with a bottom anti-settling device (6). The bottom anti-settling device (6) includes a fixing rod (61). The fixing rod (61) is fixedly connected to the bottom end of the stirring shaft (55). One end of the fixing rod (61) is fixedly connected to a fixing connecting block (62). An arc-shaped scraper (63) is fixedly connected to the side of the fixing connecting block (62). A rotating shaft (64) is rotatably connected to the top of the arc-shaped scraper (63). A baffle plate (65) is fixedly connected to the circumferential surface of the rotating shaft (64).

6. The ladle refining furnace for alloy steel processing according to claim 5, characterized in that, The side of the arc-shaped scraper (63) is provided with an arc-shaped groove (66). The number of the arc-shaped scraper (63) and the baffle (65) are both set to two, and they are distributed in a circumferential array on the circumferential surface of the fixed connecting block (62).

7. A ladle refining furnace for alloy steel processing according to claim 6, characterized in that, The refining furnace body (4) is fixedly connected to a second sub-furnace (7), and the second sub-furnace (7) has a liquid leakage hole (11) through its circumference.

8. A ladle refining furnace for alloy steel processing according to claim 7, characterized in that, The inner bottom wall of the refining furnace body (4) is arc-shaped, and the number of graphite electrode columns (8) is set to four, which are distributed in a circumferential array on the top of the disassembled top cover (9).

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