A ladle external bottom-blown brick leak-proof structure

Abstract

The present invention discloses a ladle external bottom blowing brick leakage prevention structure, which relates to the ladle bottom blowing technology field, including core bricks, the bottom end of the core bricks is connected with a vent pipe, one end of the vent pipe located inside the core bricks is fixedly connected with a conical cover, the interior of the conical cover is filled with diffused air-permeable bricks, the outer side of the vent pipe is sleeved with a leakage prevention brick, and a buffer groove is provided at the edge of one side of the leakage prevention brick close to the core brick. The ladle external bottom blowing brick leakage prevention structure can cool the molten steel and receive it when steel seeps from the gap; when steel leaks from the air guide hole, the molten steel can be cooled and the air guide hole can be blocked to avoid the molten steel from continuously corroding the flow hole, prevent the accident from expanding, and allow the staff to have enough time to react and handle, while making it more convenient to pull out and replace the core bricks.

Description

Technical Field

[0001] The invention relates to the technical field of ladle bottom blowing, in particular to a ladle external bottom blowing brick leakage prevention structure. Background Art

[0002] Among the many off-furnace refining technologies, argon blowing at the bottom of the ladle is the off-furnace refining technology with the least investment and the easiest operation. Since the bottom argon blowing technology of the internal air-permeable brick has many cold repairs of the ladle bottom, low turnover rate of the ladle, serious lining peeling caused by rapid cooling and heating of the cold repair, and low life of the ladle lining, the hot replacement of the external air-permeable brick process technology to improve the turnover rate of the ladle is the mainstream of the advanced technology for efficient production in the current steel industry. The existing external air-permeable bricks mainly include diffused air-permeable bricks, straight-through directional air-permeable bricks and slit directional air-permeable bricks, among which slit air-permeable bricks are the most widely used.

[0003] The main locations and reasons for the leakage of bottom argon blowing bricks are as follows:

[0004] 1. Steel seepage in gaps: Steel seepage in gaps includes the gaps between the seat bricks and the refractory material at the bottom of the ladle, and the gaps between the core bricks and their seat bricks. The gaps between the core bricks and their seat bricks are usually caused by the rapid erosion of the refractory material filled around the seat bricks in a high temperature environment, the core bricks shrinking due to cooling, or the refractory material filled around the seat bricks is not full. The existing solution is to seal the lower part of the core brick by adding pad bricks, but if the pad brick fire mud is not full, it cannot play a secondary protection role.

[0005] 2. Steel leakage from air guide holes: When the air bricks are corroded and steel leakage occurs, the molten steel generally flows out from the argon blowing air guide holes of the air bricks in small streams, and then the holes are continuously eroded, the flow becomes larger and larger, and finally a major safety accident occurs.

[0006] 3. Seat brick damage and steel leakage: The traditional way to replace breathable bricks is to extend a steel rod from the opening to the surface of the core brick and manually pound the core brick down. This operation will inevitably hit the surface of the seat brick during implementation. The strength of the seat brick is very low in the hot state. When hit, the surface seat brick may be damaged or cracked. As the cracks expand in the later stage of use, steel leakage may occur. Therefore, replacing with pull-out removal can avoid the above situation. However, the structure of the brick body affects the efficiency of pull-out replacement, and it is easy to break and inconvenience in connection.

[0007] Therefore, it is necessary to propose a ladle external bottom blowing brick leak-proof structure to solve the above problems. Summary of the invention

[0008] The object of the present invention is to provide a ladle external bottom blowing brick leakage prevention structure with good leakage prevention effect and convenient disassembly and assembly, so as to solve the problems raised in the above background technology.

[0009] To achieve the above objectives, the present invention is implemented through the following technical scheme: a ladle external bottom blowing brick leakage prevention structure, including a core brick, the bottom end of the core brick is connected to a vent pipe, one end of the vent pipe located inside the core brick is fixedly connected to a conical cover, the interior of the conical cover is filled with diffused breathable bricks, the outer side of the vent pipe is sleeved with a leakage-proof brick, and a buffer groove is provided on one side edge of the leakage-proof brick close to the core brick.

[0010] Preferably, the core brick is a slit directional air-permeable brick or a straight directional air-permeable brick:

[0011] Furthermore, when the core brick is a slit-oriented air-permeable brick, the air-permeable slit of the slit-oriented air-permeable brick is connected to the conical cover.

[0012] Furthermore, when the core brick is a straight-through directional air-permeable brick, the straight-through hole of the straight-through directional air-permeable brick is connected to the conical cover.

[0013] Furthermore, it includes an upper seat brick and a lower seat brick, wherein the middle of the upper seat brick is provided with a conical hole matched with the core brick, the length of the core brick is greater than the thickness of the upper seat brick, and the middle of the lower seat brick is provided with a through hole for the leakage-proof brick to pass through.

[0014] Furthermore, the lower seat brick is located below the upper seat brick and a limiting groove matched with the upper seat brick is opened in the middle of the lower seat brick.

[0015] Preferably, the core brick is in the shape of a truncated cone, and the diameter of the buffer groove is matched with the diameter of the bottom end of the core brick.

[0016] Preferably, a limiting ring is fixed to the outer side of the ventilation pipe.

[0017] Beneficial Effects

[0018] Compared with the prior art, the present invention provides a ladle external bottom blowing brick leakage prevention structure, which has the following beneficial effects:

[0019] 1. The ladle has an external bottom-blowing brick leak-proof structure. An L-shaped gap is formed between the upper and lower bricks and the refractory material at the bottom of the ladle to increase the flow path required for the molten steel to seep out. If there is steel seepage, the molten steel will flow to the lower brick position, the temperature will drop, and the molten steel will solidify here, preventing the accident from expanding.

[0020] 2. The ladle has an external bottom-blowing brick leak-proof structure. When steel seeps from the gap between the upper brick and the core brick, the seeped steel flows into the buffer tank to prevent it from dripping directly, giving the staff enough time to react and handle the situation.

[0021] 3. The ladle external bottom blowing brick anti-leakage structure, when the air holes of the air bricks are eroded and steel leakage occurs, after the molten steel penetrates deeply into the air holes, the dispersed air bricks will block the molten steel, forming cold steel in the air holes, blocking the air holes, avoiding continuous erosion of the flow holes, and preventing the accident from expanding.

[0022] 4. The ladle external bottom-blown brick leak-proof structure, under the action of the limit ring, makes the clamping connection between the pulling device and the vent pipe more stable, so as to facilitate the pulling and removal of the core bricks. At the same time, under the action of the conical cover, the connection between the vent pipe and the core brick is more stable, so that it can adapt to the pulling and removal operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of the structure of the present invention.

[0024] In the figure: 1. upper seat brick; 2. core brick; 3. buffer groove; 4. lower seat brick; 5. leak-proof brick; 6. tightening device; 7. air guide hole; 8. conical cover; 9. diffused breathable brick; 10. vent pipe; 11. limit ring. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely 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, rather than all the embodiments.

[0026] See also Figure 1 As shown, a ladle external bottom blowing brick leakage prevention structure includes a core brick 2, the bottom end of the core brick 2 is connected to a vent pipe 10, one end of the vent pipe 10 located inside the core brick 2 is fixedly connected to a conical cover 8, the interior of the conical cover 8 is filled with diffused air-permeable bricks 9, and the outer side of the vent pipe 10 is sleeved with a leakage-proof brick 5, and the leakage-proof brick 5 is provided with a buffer groove 3 at one side edge close to the core brick 2. The core brick 2 is a truncated cone, and the diameter of the buffer groove 3 is adapted to the diameter of the bottom end of the core brick 2.

[0027] Specifically, the core brick 2 adopts a narrow slit directional air-permeable brick or a straight directional air-permeable brick:

[0028] When the core brick 2 adopts a slit directional air-permeable brick, the air permeable slit of the slit directional air-permeable brick is connected to the conical cover 8; when the core brick 2 adopts a straight-through directional air-permeable brick, the straight-through hole of the straight-through directional air-permeable brick is connected to the conical cover 8.

[0029] In some embodiments, in order to prevent steel from seeping into the gaps, the seat bricks are divided into an upper seat brick 1 and a lower seat brick 4. A conical hole matching the core brick 2 is opened in the middle of the upper seat brick 1, and the length of the core brick 2 is greater than the thickness of the upper seat brick 1. A through hole for the leak-proof brick 5 to pass through is opened in the middle of the lower seat brick 4. The lower seat brick 4 is located below the upper seat brick 1 and a limiting groove matching the upper seat brick 1 is opened in the middle of the lower seat brick 4.

[0030] In some embodiments, in order to facilitate the removal of the core brick 2 by pulling, a limiting ring 11 is fixed to the outer side of the ventilation pipe 10 .

[0031] During installation, the core brick 2 is inserted into the conical hole of the upper seat brick 1, and bulk material is poured or rammed in the gap between the core brick 2 and the upper seat brick 1. The leak-proof brick 5 is sleeved on the outside of the vent pipe 10 and tightened by the tightening device 6 to prevent the core brick 2 from retreating. The tightening device 6 adopts existing equipment and will not be described in detail here.

[0032] When in use, argon is introduced into the core brick 2 through the vent pipe 10, the argon is dispersed through the dispersed air brick 9 and enters the core brick 2, and then enters the ladle through the air guide hole 7.

[0033] Steel seepage in gaps: By using upper seat bricks 1 and lower seat bricks 4, an L-shaped gap is formed between the upper seat bricks 1, the lower seat bricks 4 and the refractory material at the bottom of the ladle, thereby increasing the flow path required for the molten steel to seep out. If steel seepage occurs, the molten steel will flow to the position of the lower seat brick 4, where the temperature will drop and the molten steel will solidify, preventing the accident from expanding. When steel seepage occurs in the gap between the upper seat brick 1 and the core brick 2, the seeping molten steel will flow into the buffer tank 3 to prevent it from dripping directly, allowing the staff to have enough time to react and handle the situation.

[0034] Steel leakage from air guide hole: When air bricks are corroded and steel leakage occurs, the molten steel generally flows out of the argon blowing air guide hole of the core brick 2 in small streams, and then continuously corrodes the flow hole, and the flow becomes larger and larger. Taking the slit directional air brick as an example, by adding the diffuse air brick 9, when the molten steel deeply penetrates into the air permeable slit, the molten steel is blocked by the diffuse air brick 9, so that it forms cold steel in the slit, blocks the slit, avoids continuous erosion of the flow hole, and prevents the accident from expanding.

[0035] When replacing the core brick 2, under the action of the limiting ring 11, the clamping connection between the pulling device and the ventilation pipe 10 is made more stable, so that the core brick 2 can be pulled out and removed. At the same time, under the action of the conical cover 8, the connection between the ventilation pipe 10 and the core brick 2 is made more stable, so that it can adapt to the pulling and removal operation. The pulling device adopts existing equipment and will not be elaborated here.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ladle external bottom-blown brick leak-proof structure, comprising a core brick (2), characterized in that: The bottom end of the core brick (2) is connected to a vent pipe (10), one end of the vent pipe (10) located inside the core brick (2) is fixedly connected to a conical cover (8), the interior of the conical cover (8) is filled with diffused air-permeable bricks (9), the outer side of the vent pipe (10) is sleeved with a leak-proof brick (5), and a buffer groove (3) is provided at an edge of one side of the leak-proof brick (5) close to the core brick (2).

2. The ladle external bottom blowing brick leak-proof structure according to claim 1, characterized in that: The core brick (2) is a slit-oriented air-permeable brick, and the air-permeable slit of the slit-oriented air-permeable brick is connected to the conical cover (8).

3. The ladle external bottom blowing brick leak-proof structure according to claim 1, characterized in that: The core brick (2) is a straight-through directional air-permeable brick, and the straight-through hole of the straight-through directional air-permeable brick is connected to the conical cover (8).

4. The ladle external bottom blowing brick leak-proof structure according to claim 1, characterized in that: It also comprises an upper seat brick (1) and a lower seat brick (4), wherein the middle of the upper seat brick (1) is provided with a conical hole adapted to the core brick (2), the length of the core brick (2) is greater than the thickness of the upper seat brick (1), and the middle of the lower seat brick (4) is provided with a through hole for the leakage-proof brick (5) to pass through.

5. The ladle external bottom blowing brick leak-proof structure according to claim 4, characterized in that: The lower seat brick (4) is located below the upper seat brick (1), and a limiting groove matching the upper seat brick (1) is provided in the middle of the lower seat brick (4).

6. The ladle external bottom blowing brick leak-proof structure according to claim 1, characterized in that: The core brick (2) is in the shape of a truncated cone, and the diameter of the buffer groove (3) is matched with the diameter of the bottom end of the core brick (2).

7. The ladle external bottom blowing brick leak-proof structure according to claim 1, characterized in that: A limiting ring (11) is fixed on the outer side of the ventilation pipe (10).

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