Single-hole dip pipe structure of RH refining furnace

Abstract

The utility model relates to the field of RH refining furnace dip pipes, and discloses an RH refining furnace single-hole dip pipe structure which comprises a cleaning component and an RH refining furnace, and the cleaning component is movably installed on the outer surface of the bottom of the RH refining furnace; a dip pipe is fixedly installed in the center of the bottom of the RH refining furnace, wedge-shaped clamping plates are symmetrically arranged on the outer surface of the dip pipe, and a conical supporting ring is arranged on the outer surface of the edge of the bottom of the dip pipe. The service life of the dip pipe is prolonged, and normal use of the dip pipe is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of RH refining furnace impregnation tubes, specifically to a single-hole impregnation tube structure for an RH refining furnace. Background Technology

[0002] RH refining, also known as RH vacuum circulation degassing refining, involves the entire metallurgical reaction of molten steel taking place in a vacuum tank lined with refractory. The lower part of the vacuum tank consists of two refractory-lined impregnation pipes, one of which is an ascending pipe and the other is a descending pipe.

[0003] The single-hole vacuum refining furnace is a modified RH furnace, most notably characterized by a large cylindrical immersion tube. The upper part of this tube is connected to the vacuum chamber, while the lower part is inserted into the molten steel in the ladle. The pressure difference draws the molten steel into the immersion tube, while simultaneously expelling ladle slag outside. Driving gas is blown in through eccentric permeable bricks at the bottom of the ladle, causing the molten steel to rise on one side of the immersion tube and descend on the other, thus circulating the molten steel.

[0004] However, in the existing RH refining furnace single-hole immersion tube structure, during use, after the single-hole immersion tube comes into contact with the molten steel in the ladle, some molten steel and impurities adhere to its outer surface upon detachment. If this adhesion is not addressed, it will form a hard deposit upon cooling. This deposit will be continuously eroded by the molten steel and subjected to thermal stress during subsequent refining processes. Over time, this will exacerbate damage to the refractory material of the immersion tube, leading to cracks and spalling, significantly shortening its service life. Furthermore, the large amount of molten steel and impurities adhering to the outer surface increases the weight of the immersion tube, placing a greater load on cranes and other lifting equipment, and increasing safety risks during operation. Utility Model Content

[0005] The purpose of this utility model is to provide a single-hole immersion tube structure for an RH refining furnace, and to solve the following technical problem: how to clean the molten steel and impurities adhering to the outer surface of the single-hole immersion tube.

[0006] The purpose of this utility model can be achieved through the following technical solution: a single-hole impregnation tube structure for an RH refining furnace, comprising: a cleaning component and an RH refining furnace, wherein the cleaning component is movably installed on the bottom outer surface of the RH refining furnace;

[0007] An impregnation tube is fixedly installed at the center of the bottom of the RH refining furnace. Wedge-shaped clamping plates are symmetrically arranged on the outer surface of the impregnation tube, and a conical support ring is provided on the outer surface of the bottom edge of the impregnation tube.

[0008] The cleaning component includes a second extension plate, a slag removal ring, a first extension plate, and a connecting plate. The first extension plate and the second extension plate are slidably inserted into one end of the connecting plate on the outer surface of the slag removal ring. The connecting plate is symmetrically welded to the outer surface of the slag removal ring. One end face of the connecting plate is symmetrically provided with insertion holes. The upper surface of the first extension plate is symmetrically provided with limit grooves. One end face of both the first extension plate and the second extension plate is symmetrically provided with connecting rods.

[0009] The other ends of the first and second extension plates are threaded with threaded rods. The bottom of the threaded rods is fixedly connected with a support plate. The inner surface of the slag removal ring is symmetrically provided with wedge-shaped grooves. The upper surface of one end of the connecting plate is movably engaged with a positioning tooth frame. The upper surfaces of both ends of the positioning tooth frame are fixedly connected with tension springs. The outer surface of the connecting rod is provided with tooth grooves.

[0010] As a preferred embodiment of this utility model: the first extended plate is slidably sleeved on the outer surface of the impregnation tube by a slag removal ring, and the slag removal ring is slidably engaged with a wedge-shaped clamping plate through a wedge-shaped groove on its inner surface.

[0011] As a preferred embodiment of this utility model: the bottom end of the slag removal ring is adapted to and in contact with the conical support ring, and the connecting rod at one end of the first extension plate and the second extension plate is slidably inserted into the insertion hole.

[0012] As a preferred embodiment of this utility model, a limit block is provided at one end of the connecting rod.

[0013] As a preferred embodiment of this utility model, the connecting rod is slidably engaged with the limiting groove by a limiting block.

[0014] As a preferred embodiment of this utility model, the two ends of the positioning gear are internally engaged with one end of the insertion hole.

[0015] As a preferred embodiment of this utility model, the two ends of the positioning tooth frame are engaged with the tooth grooves on the outer surface of the connecting rod inside the insertion hole.

[0016] The beneficial effects of this utility model are:

[0017] (1) By sliding the first extension plate and the second extension plate on the outer surface of the slag removal ring, the size of the cleaning component can be adjusted, so that the cleaning component can be adapted to use with steel ladles of different sizes. Moreover, the distance between the bottom of the slag removal ring and the top of the steel ladle can be adjusted, thereby ensuring the normal use of the cleaning component and avoiding damage to the cleaning component from high temperature for a long time.

[0018] (2) By setting a cleaning component on the outer surface of the immersion tube, this utility model can clean the molten steel and impurities adhering to the outer surface of the single-hole immersion tube, extend the service life of the immersion tube, and ensure the normal use of the immersion tube. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 A schematic diagram of the single-hole impregnation tube structure of the RH refining furnace;

[0021] Figure 2 A schematic diagram of the disassembled structure for cleaning components;

[0022] Figure 3 for Figure 2 A magnified view of the structure at point A in the middle;

[0023] Figure 4 This is a schematic diagram of the RH refining furnace.

[0024] Figure descriptions: 1. Cleaning component; 2. RH refining furnace; 11. Threaded rod; 12. First extension plate; 13. Connecting rod; 14. Slag removal ring; 15. Wedge groove; 16. Support plate; 17. Second extension plate; 18. Positioning gear frame; 19. Insertion hole; 110. Tension spring; 111. Limiting slide groove; 112. Connecting plate; 21. Immersion tube; 22. Conical support ring; 23. Wedge clamping plate. Detailed Implementation

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

[0026] Please see Figures 1-4 As shown, this utility model is a single-hole impregnation tube structure for an RH refining furnace, comprising: a cleaning component 1 and an RH refining furnace 2, wherein the cleaning component 1 is movably installed on the bottom outer surface of the RH refining furnace 2;

[0027] An impregnation tube 21 is fixedly installed at the bottom center of the RH refining furnace 2. Wedge-shaped clamping plates 23 are symmetrically arranged on the outer surface of the impregnation tube 21, and a conical support ring 22 is arranged on the outer surface of the bottom edge of the impregnation tube 21.

[0028] The cleaning component 1 includes a second extension plate 17, a slag removal ring 14, a first extension plate 12, and a connecting plate 112. The first extension plate 12 and the second extension plate 17 are respectively slidably inserted into one end of the connecting plate 112 on the outer surface of the slag removal ring 14. The connecting plate 112 is symmetrically welded to the outer surface of the slag removal ring 14. One end face of the connecting plate 112 is symmetrically provided with insertion holes 19. The upper surface of the first extension plate 12 is symmetrically provided with limit grooves 111. One end face of the first extension plate 12 and the second extension plate 17 are symmetrically provided with connecting rods 13.

[0029] The other ends of the first extension plate 12 and the second extension plate 17 are threadedly connected to a threaded rod 11. The bottom of the threaded rod 11 is fixedly connected to a support plate 16. The inner surface of the slag removal ring 14 is symmetrically provided with wedge-shaped grooves 15. The upper surface of one end of the connecting plate 112 is movably engaged with a positioning tooth frame 18. The upper surfaces of both ends of the positioning tooth frame 18 are fixedly connected with tension springs 110. The outer surface of the connecting rod 13 is provided with tooth grooves.

[0030] The first extension plate 12 of this utility model is slidably sleeved on the outer surface of the impregnation tube 21 by the slag removal ring 14, which allows the slag removal ring 14 to rise and fall on the outer surface of the impregnation tube 21 to perform a cleaning function. The slag removal ring 14 is slidably engaged with the wedge-shaped clamping plate 23 through the wedge-shaped groove 15 on the inner surface, which can prevent the slag removal ring 14 from rotating on the outer surface of the impregnation tube 21 and affecting normal use. The bottom end of the slag removal ring 14 is adapted to and moves against the conical support ring 22, thereby restricting the slag removal ring 14 from detaching from the bottom outer surface of the impregnation tube 21. The connecting rod 13 at one end of the first extension plate 12 and the second extension plate 17 is slidably inserted into the insertion hole 19, which can limit the sliding of the first extension plate 12 and the second extension plate 17.

[0031] One end of the connecting rod 13 of this utility model is provided with a limiting block. The connecting rod 13 is slidably engaged with the limiting groove 111 through the limiting block. Both ends of the positioning tooth frame 18 are engaged with the inside of one end of the insertion hole 19. Both ends of the positioning tooth frame 18 are engaged with the tooth groove on the outer surface of the connecting rod 13 inside the insertion hole 19.

[0032] The working principle of this invention is as follows: During the operation of the RH refining furnace, a single-hole immersion tube 21 is inserted into the ladle. The upper part of the immersion tube 21 is connected to the vacuum chamber, and the lower part is inserted into the molten steel in the ladle. The pressure difference draws the molten steel into the immersion tube 21, while simultaneously removing ladle slag from the outside of the tube. Driving gas is blown in through the eccentric permeable brick at the bottom of the ladle, causing the molten steel to rise from one side of the immersion tube 21 and descend from the other side, thus driving the molten steel to circulate. After the RH refining furnace completes degassing, decarburization, and inclusion removal, it is necessary to control the RH refining furnace 2 to detach from the molten steel in the ladle. The single-hole immersion... During the insertion of tube 21 into the ladle, the edge of the ladle will contact the bottom of the first extension plate 12 and the second extension plate 17, thus preventing the cleaning component 1 from descending along with the immersion tube 21. Therefore, when the immersion tube 21 separates from the ladle, the cleaning component 1 will descend along the outer surface of the immersion tube 21 under the action of gravity. At the same time, the bottom of the slag removal ring 14 will scrape the molten steel and impurities adhering to the outer surface of the immersion tube 21, causing the molten steel and impurities to flow down to the bottom of the immersion tube 21 and finally detach from the outer surface of the immersion tube 21 under the action of gravity, thereby achieving the automatic cleaning effect on the outer surface of the immersion tube 21. The cleaning component 1 can also be adjusted to fit the size of the ladle. When adjusting the overall size of the cleaning component 1, the positioning tooth frame 18 can be pulled to separate from the tooth groove on the outer surface of the connecting rod 13. Then, the first extension plate 12 and the second extension plate 17 can be pulled to slide at one end of the connecting plate 112 until the overall length of the cleaning component 1 is adapted to the ladle. The external force on the positioning tooth frame 18 is then removed, causing the positioning tooth frame 18 to engage with the outer surface of the connecting rod 13. This positions the connecting rod 13 inside the insertion hole 19 after it has slid, and it can also rotate. The threaded rod 11 drives the bottom support plate 16 to rise and fall, thereby adjusting the distance between the slag removal ring 14 and the top of the ladle. When the threaded rod 11 is rotated, since the threaded rod 11 is connected to the first extension plate 12 and the second extension plate 17 by threads, the support plate 16 will move vertically with the rotation of the threaded rod 11, avoiding damage to the cleaning component 1 from prolonged exposure to high temperatures on the top of the ladle. Therefore, by setting the cleaning component 1 on the outer surface of the immersion tube 21, the molten steel and impurities adhering to the outer surface of the single-hole immersion tube 21 can be cleaned, extending the service life of the immersion tube 21 and ensuring its normal use.

[0033] The above description details one embodiment of the present utility model, but it is merely a preferred embodiment and should not be construed as limiting the scope of the present utility model. All equivalent variations and improvements made within the scope of the present utility model application should still fall within the patent coverage of the present utility model.

Claims

1. A single-hole impregnation tube structure for an RH refining furnace, comprising: Cleaning component (1) and RH refining furnace (2), wherein the cleaning component (1) is movably mounted on the bottom outer surface of the RH refining furnace (2); The RH refining furnace (2) is characterized in that an impregnation tube (21) is fixedly installed at the bottom center, wedge-shaped clamping plates (23) are symmetrically arranged on the outer surface of the impregnation tube (21), and a conical support ring (22) is arranged on the outer surface of the bottom edge of the impregnation tube (21). The cleaning component (1) includes a second extension plate (17), a slag removal ring (14), a first extension plate (12), and a connecting plate (112). The first extension plate (12) and the second extension plate (17) are slidably inserted into one end of the connecting plate (112) on the outer surface of the slag removal ring (14). The connecting plate (112) is symmetrically welded to the outer surface of the slag removal ring (14). One end face of the connecting plate (112) is symmetrically provided with insertion holes (19). The upper surface of the first extension plate (12) is symmetrically provided with limit grooves (111). One end face of the first extension plate (12) and the second extension plate (17) are symmetrically provided with connecting rods (13). The other end of the first extension plate (12) and the second extension plate (17) is threadedly connected to a threaded rod (11). The bottom of the threaded rod (11) is fixedly connected to a support plate (16). The inner surface of the slag removal ring (14) is symmetrically provided with wedge-shaped grooves (15). The upper surface of one end of the connecting plate (112) is movably engaged with a positioning tooth frame (18). The upper surfaces of both ends of the positioning tooth frame (18) are fixedly connected with tension springs (110). The outer surface of the connecting rod (13) is provided with tooth grooves.

2. The single-hole impregnation tube structure for an RH refining furnace according to claim 1, characterized in that, The first extension plate (12) is slidably sleeved on the outer surface of the impregnation tube (21) by a slag removal ring (14), and the slag removal ring (14) is slidably engaged with the wedge-shaped plate (23) through the wedge-shaped groove (15) on the inner surface.

3. The single-hole impregnation tube structure for an RH refining furnace according to claim 2, characterized in that, The bottom end of the slag removal ring (14) is adapted to and in contact with the conical support ring (22), and the connecting rod (13) at one end of the first extension plate (12) and the second extension plate (17) is slidably inserted into the insertion hole (19).

4. The single-hole impregnation tube structure for an RH refining furnace according to claim 3, characterized in that, A limit block is provided at one end of the connecting rod (13).

5. The single-hole impregnation tube structure for an RH refining furnace according to claim 4, characterized in that, The connecting rod (13) is slidably engaged with the limiting groove (111) by a limiting block.

6. The single-hole impregnation tube structure for an RH refining furnace according to claim 5, characterized in that, The two ends of the positioning gear (18) are internally engaged with one end of the insertion hole (19).

7. The single-hole impregnation tube structure for an RH refining furnace according to claim 6, characterized in that, The two ends of the positioning gear (18) engage with the tooth grooves on the outer surface of the connecting rod (13) inside the insertion hole (19).

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