Stopper rod for low-carbon steel tundish

Abstract

The stopper rod for the low-carbon steel tundish comprises a stopper rod body and a stopper head brick connected to one end of the stopper rod body, a connecting base is arranged at the end, away from the stopper head brick, of the stopper rod body, the connecting base and the stopper rod body abut against each other and are coaxially arranged, the outer diameter of the connecting base is larger than that of the stopper rod body, and a plurality of clamping beams are connected to the stopper rod body; a clamping groove allowing the clamping beam to penetrate is formed in the connecting base, a clamping block integrally formed with the clamping beam is arranged at the end, away from the stopper rod body, of the clamping beam, a stepped hole is formed in the connecting base, the large diameter of the stepped hole is close to the stopper rod body, and a core rod is arranged in the stepped hole in a sleeved mode and clamped in the stepped hole of the connecting base. The connecting base is sleeved with a clamping assembly matched with the clamping block in a clamping mode, and the clamping assembly abuts against the connecting base. The stopper rod has the advantages that the stopper rod body is prevented from falling off, and the service life of the stopper rod body is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of metallurgical continuous casting, and in particular to a stopper rod for a low-carbon steel tundish. Background Art

[0002] The stopper rod is a refractory rod installed in the tundish that controls the opening and closing of the nozzle and the flow of molten steel by lifting and displacing. The stopper rod is lifted and lowered by the opening and closing mechanism to control the distance from the nozzle at the bottom of the tundish, thereby controlling the flow rate of the molten steel and allowing the molten steel to flow smoothly into the crystallizer.

[0003] A Chinese patent with publication number CN207447340U discloses a mesh argon channel stopper rod, comprising a stopper rod body, a tundish is provided at the bottom of the stopper rod body, and the lower part of the stopper rod body extends into the tundish, an immersion nozzle is provided at the bottom of the tundish, the upper part of the immersion nozzle is arranged in the bottom shell of the tundish, a crystallizer is provided below the tundish, the lower part of the immersion nozzle extends into the crystallizer, a stopper rod mechanism is fixedly connected to the top of the stopper rod body by threads, and the stopper rod mechanism is arranged at the top of the tundish, molten steel is arranged in the tundish, a connector is provided at the bottom of the stopper rod body, a central cavity is axially opened at the middle position of the stopper rod body, a fixed connecting internal thread is provided at the upper position of the central cavity, and the bottom of the central cavity is connected to the main argon outlet.

[0004] However, when the stopper rod body comes into contact with molten steel, the temperature of the molten steel is above 1500°C, so the temperature of the tundish stopper rod core rod and the embedded nut rises to as high as 1100°C. At this time, the thread strength of the embedded nut decreases, which makes it easy for the stopper rod body to fall off, thus affecting the service life of the stopper rod body. Utility Model Content

[0005] In order to prevent the stopper rod body from falling off and to increase the service life of the stopper rod, the present application provides a stopper rod for a low-carbon steel tundish.

[0006] The present application provides a low carbon steel tundish stopper rod adopting the following technical solution:

[0007] A stopper rod for a low-carbon steel tundish comprises a stopper rod body and a plug head brick connected to one end of the stopper rod body, a connecting seat is provided at the end of the stopper rod body away from the plug head brick, the connecting seat and the stopper rod body abut against each other and are coaxially arranged, the outer diameter of the connecting seat is larger than the outer diameter of the stopper rod body, a plurality of clamping beams are connected to the stopper rod body, a clamping groove for the clamping beams to pass through is provided on the connecting seat, a clamping block integrally formed with the clamping beam at one end away from the stopper rod body is provided, a stepped hole is provided inside the connecting seat, an end of the stepped hole with the largest inner diameter is close to the stopper rod body, a core rod is sleeved in the stepped hole, the core rod is clamped in the stepped hole of the connecting seat, a clamping assembly that is clamped with the clamping block is sleeved on the connecting seat, and the clamping assembly abuts against the connecting seat.

[0008] By adopting the above technical solution, the core rod is clamped in the connecting seat through the stepped hole, and then the clamping seat is sleeved on the stopper rod body. The cooperation between the clamping groove and the clamping beam limits the rotation of the connecting seat. The clamping assembly is sleeved on the connecting seat, so that the clamping assembly and the clamping block are clamped and matched, so that the stopper rod body is not easy to fall off, thereby improving the service life of the stopper rod body. The outer diameter of the connecting seat is larger than the outer diameter of the stopper rod body, which can limit the clamping assembly and prevent the clamping assembly from falling off.

[0009] Optionally, the clamping assembly includes a ring plate and multiple fixed plates, which are centrally symmetrically arranged along the axis of the ring plate and are integrally formed on the inner ring of the ring plate. A gap is formed between two adjacent fixed plates for the clamping block to pass through, and the fixed plate and the clamping block are rotatably clamped together.

[0010] By adopting the above technical solution, the lower surface of the clamping block can be in contact with the upper surface of the fixing plate, so that the structure of the stopper rod body is more stable, and the possibility of the stopper rod body falling off is further reduced.

[0011] Optionally, a cover plate is provided in the clamping assembly, the cover plate is coaxially arranged with the core rod, the cover plate is provided with an avoidance groove for the clamping block on the clamping beam to pass through, the cover plate is provided with a stopper integrally formed therewith, and the stopper is clamped between two adjacent fixed plates.

[0012] By adopting the above technical solution, the cover plate is sleeved on the core rod, and the avoidance groove opened on the cover plate can avoid the clamping block, so that the cover plate can be smoothly placed in the clamping assembly, and the stopper on the cover plate is just clamped between two adjacent fixed plates, so that the clamping block on the clamping beam is not easy to rotate, reducing the possibility of the stopper rod body falling off, thereby ensuring the safety of the stopper rod body when in use.

[0013] Optionally, a plurality of lifting rings are provided on the cover plate and are symmetrically arranged along the axis of the cover plate.

[0014] By adopting the above technical solution, after the stopper rod body is used, the high temperature of the molten steel will affect the cover plate, making it difficult to remove the cover plate. The setting of the lifting ring can facilitate the removal of the cover plate after use, thereby improving work efficiency.

[0015] Optionally, a plurality of guide plates are provided on the stopper rod body and are symmetrically arranged along the axis of the stopper rod body.

[0016] By adopting the above technical solution, the guide plate can divert the molten steel in the tundish, improve the fluidity of the molten steel, and thus improve the quality of the product after casting.

[0017] Optionally, argon holes are provided on the stopper rod body, the core rod and the stopper head brick, and are interconnected.

[0018] By adopting the above technical solution, when the stopper rod body is in use, the temperature of the stopper rod body will increase with the temperature of the molten steel, which will affect the service life of the stopper rod body. Argon gas can be connected to the outside through the argon hole, and argon gas, as an inert gas, can effectively protect the surface of the stopper rod body, thereby increasing the service life of the stopper rod body.

[0019] Optionally, a plurality of argon branch holes are opened at one end of the stopper rod body close to the plug head brick, the argon branch holes are connected to the argon holes, and the axes of the argon branch holes intersect with the axes of the argon holes, and the argon branch holes are arranged between two adjacent guide plates.

[0020] By adopting the above technical solution, when argon enters the argon hole through the argon hole, most of the argon will directly pass through the argon hole of the plug brick to protect the stopper rod body, and the argon branch hole can allow the argon to reach between the guide plates through the branch hole before reaching the argon hole of the plug brick, so that the argon can fit the stopper rod body more closely and protect the stopper rod body more fully, thereby further improving the service life of the stopper rod body.

[0021] Optionally, a sealing block is provided at one end of the stopper rod body away from the plug head brick. The sealing block is integrally formed with the stopper rod body. The sealing block is sleeved in the stepped hole and abuts against the core rod.

[0022] By adopting the above technical solution, since the stopper rod body needs to be protected by argon gas, and the sealing block is used to make it cooperate with the stepped hole on the connecting seat, the sealing performance of the stopper rod body is ensured.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The core rod is clamped in the connection seat through the stepped hole, and then the clamping seat is sleeved on the stopper rod body. The cooperation between the clamping groove and the clamping beam limits the rotation of the connection seat. The clamping assembly is sleeved on the connection seat, so that the clamping assembly and the clamping block are clamped and matched, so that the stopper rod body is not easy to fall off, thereby improving the service life of the stopper rod body. The outer diameter of the connection seat is larger than the outer diameter of the stopper rod body, which can limit the clamping assembly and prevent it from falling off;

[0025] 2. The contact area between the clamping block and the fixing plate can be increased to make the structure of the stopper rod body more stable, further reducing the possibility of the stopper rod body falling off;

[0026] 3. The cover plate is placed on the core rod, and the stopper on the cover plate is just clamped between two adjacent fixed plates, so that the clamping block on the clamping beam will not rotate and cause the clamping assembly to fall off, thereby ensuring the safety of the plug rod body when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the stopper rod body.

[0028] Figure 2 It is a schematic diagram of the breakage and explosion of the stopper rod body.

[0029] Figure 3 It is a schematic diagram of a broken cross-section of the stopper rod body.

[0030] Explanation of the reference numerals: 1. plug rod body; 11. clamping beam; 111. clamping block; 12. guide plate; 13. argon branch hole; 14. sealing block; 2. core rod; 3. plug brick; 4. connecting seat; 41. clamping groove; 42. stepped hole; 5. clamping assembly; 51. ring plate; 52. fixing plate; 6. cover plate; 61. stopper; 62. lifting ring; 63. avoidance groove; 7. argon hole. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The embodiment of the present application discloses a stopper rod for a low-carbon steel tundish.

[0033] Reference Figures 1 to 3 A stopper rod for a low-carbon steel tundish comprises a stopper rod body 1 and a plugging brick 3. One end of the stopper rod body 1 is fixedly connected to the plugging brick 3, and the other end is provided with a clamping beam 11 integrally formed therewith. A clamping block 111 integrally formed therewith is provided on the end of the clamping beam 11 away from the stopper rod body 1. A connecting seat 4 is coaxially sleeved on the end of the stopper rod body 1 away from the plugging brick 3. A clamping groove 41 is provided on the outer surface of the connecting seat 4. The clamping groove 41 is arranged along the length direction of the connecting seat 4. The connecting groove corresponds to the clamping beam 11 one by one, and the connecting groove is used to limit the clamping beam 11. The step beam is slidably connected in the clamping groove 41. A stepped hole 42 is provided on the connecting seat 4. The end with the maximum inner diameter of the stepped hole 42 is arranged close to the stopper rod body 1. A core rod 2 is arranged in the stepped hole 42. The core rod 2 is clamped and matched with the stepped hole 42 on the connecting seat 4. The outer diameter of the connecting seat 4 is larger than the outer diameter of the stopper rod body 1. A clamping assembly 5 is coaxially arranged at one end of the connecting seat 4 away from the stopper rod body 1. The clamping assembly 5 is rotatably clamped with the clamping block 111, so that the connecting seat 4, the core rod 2 and the stopper rod body 1 are locked, and the clamping assembly 5 abuts against the connecting seat 4.

[0034] Reference Figures 1 to 3, the operator first sets the core rod 2 in the stepped hole 42 of the connecting seat 4, and then sets the core rod 2 and the connecting seat 4 on the stopper body 1 through the clamping beam 11. At this time, due to the cooperation between the clamping beam 11 and the clamping groove 41, the connecting seat 4 cannot rotate on the stopper body 1. At this time, the clamping assembly 5 is set on the connecting seat 4, and then the stopper body 1 is connected to the connecting seat 4 through the cooperation between the clamping block 111 and the clamping assembly 5, so that the stopper body 1 will not fall off, thereby improving the service life of the stopper body 1. Then the operator holds the core rod 2 through the opening and closing mechanism of the stopper body 1, thereby controlling the stopper body 1 to control the flow of molten steel in the tundish.

[0035] Reference Figure 2 and Figure 3 The clamping assembly 5 includes a ring plate 51 and a fixing plate 52. The fixing plates 52 are provided in plurality and are integrally formed with the clamping assembly 5. The fixing plates 52 are centrally symmetrically arranged along the axis of the ring plate 51. A gap is formed between two adjacent fixing plates 52 for the clamping block 111 to pass through. When the operator sleeves the ring plate 51 on the connecting seat 4, since the clamping groove 41 and the clamping beam 11 have been matched at this time, it is necessary to match the gap between the two adjacent fixing plates 52 with the connecting block. Since the outer diameter of the connecting seat 4 is larger than the outer diameter of the stopper rod body 1, the ring plate 51 will not fall off when it is sleeved on the connecting seat 4. When the clamping assembly 5 is placed on the connecting rod, the lower surface of the clamping block 111 is brought into contact with the upper surface of the fixing plate 52 by rotating the clamping assembly 5. At this time, the stopper rod body 1, the connecting seat 4, the clamping assembly 5 and the core rod 2 are locked, thereby reducing the possibility of the stopper rod body 1 falling off.

[0036] Reference Figure 2 and Figure 3The clamping assembly 5 is provided with a cover plate 6, which is coaxially arranged with the mandrel 2. An avoidance groove 63 is provided on the outer surface of the cover plate 6, and the avoidance groove 63 is centrally symmetrically arranged along the axis of the cover plate 6, and the avoidance groove 63 corresponds to the clamping block 111 one by one. The cover plate 6 is provided with a stopper 61 integrally formed therewith, and the stopper 61 is centrally symmetrically arranged along the axis of the cover plate 6, and the stopper 61 is arranged between two adjacent avoidance grooves 63. When the operator holds the mandrel 2 through the closing mechanism and operates the mandrel 2 to control the flow rate of the molten steel in the tundish, the clamping assembly 5 may cause the clamping block 111 to slide into the gap between the two adjacent fixing plates 52 due to shaking, so that the clamping assembly 5 and the stopper body 1 fall off, so the cover plate 6 is sleeved on the clamping assembly 5, and the avoidance groove 63 opened on the cover plate 6 can avoid the clamping block 111, so that the cover plate 6 is smoothly placed in the clamping assembly 5, so that the stopper block 61 on the cover plate 6 is limited to the gap between the two adjacent fixing plates 52, thereby ensuring that the stopper body 1 will not fall off due to shaking. The end surface of the cover plate 6 is symmetrically and fixedly connected with a lifting ring 62. When the stopper body 1 needs to be disassembled, due to long-term operation, the space between the cover plate 6 and the clamping assembly 5 will be very hot, and there is no way to directly remove it to complete the disassembly, so through the lifting ring 62, and then the hook is connected to the outside, the cover plate 6 can be taken out, thereby improving work efficiency.

[0037] Reference Figure 2 and Figure 3 The end of the stopper rod body 1 away from the plug brick 3 is provided with a sealing block 14 integrally formed therewith. The outer diameter of the sealing block 14 is consistent with the maximum inner diameter of the stepped hole 42 near one end of the stopper rod body 1. The sealing block 14 is plugged into and matched with the stepped hole 42 on the connecting seat 4, and abuts against the end of the core rod 2 near the stopper rod body 1. The stopper rod body 1 is provided with a plurality of guide plates 12 along its axial direction, and the plurality of guide plates 12 are centrally symmetrically arranged along the axis of the stopper rod body 1. The stopper rod body 1, the core rod 2 and the plug brick 3 are all provided with argon through holes, which are interconnected. The end of the stopper rod body 1 near the plug brick 3 is provided with a plurality of argon branch holes 13, and the argon branch holes 13 are centrally symmetrically arranged along the axis of the stopper rod body 1, and the argon branch holes 13 are located between two adjacent guide plates 12.

[0038] Reference Figure 2 and Figure 3, since the stopper rod body 1 needs to be protected by argon, the sealing block 14 makes it cooperate with the stepped hole 42 on the connecting seat 4, thereby ensuring the sealing of the stopper rod body 1. When the operator controls the stopper rod body 1 by operating the opening and closing structure, since the temperature of the molten steel in the tundish is 1500°C, although the material of the stopper rod body 1 is a refractory material, the argon hole 7 opened can connect the argon gas to the core rod 2 from the outside, so that the argon gas comes out along the argon hole 7, and because the argon gas makes other inert, it protects the surface of the stopper rod body 1, further increasing the service life of the stopper rod body 1. A plurality of guide plates 12 are equidistantly arranged along the axial direction of the stopper rod body 1, which can ensure that the molten steel in the tundish is diverted during pouring, improve the fluidity of the molten steel, and thus improve the quality of the product after pouring. The argon branch hole 13 provided on the stopper rod body 1 and close to one end of the plug head brick 3 can allow a small portion of the argon gas to pass through the argon branch hole 13 to better protect the stopper rod body 1, and the argon branch hole 13 is provided between the guide plates 12, so that the argon gas can fit the stopper rod body 1 more closely, thereby more fully protecting the stopper rod body 1 and improving the service life of the stopper rod body 1.

[0039] The implementation principle of a stopper rod for a low-carbon steel tundish in the embodiment of the present application is as follows:

[0040] The operator first sets the core rod 2 in the stepped hole 42 of the connecting seat 4, and then sets the core rod 2 and the connecting seat 4 on the stopper rod body 1 through the clamping beam 11. At this time, due to the cooperation between the clamping beam 11 and the clamping groove 41, the connecting seat 4 cannot rotate on the stopper rod body 1.

[0041] The clamping assembly 5 is sleeved on the connecting seat 4, and then the stopper rod body 1 is connected to the connecting seat 4 through the cooperation of the clamping block 111 and the clamping assembly 5, so that the stopper rod body 1 will not fall off, thereby improving the service life of the stopper rod body 1. The operator sleeves the ring plate 51 on the connecting seat 4. At this time, the connecting groove and the connecting beam have been matched, so it is necessary to match the gap between the two adjacent fixing plates 52 with the connecting block.

[0042] When the clamping assembly 5 is placed on the connecting rod, the clamping assembly 5 is rotated to make the clamping block 111 and the fixing plate 52 engage in rotational clamping, and the lower surface of the clamping block 111 contacts the upper surface of the fixing plate 52. At this time, the stopper rod body 1, the connecting seat 4, the clamping assembly 5 and the core rod 2 are locked, thereby further reducing the possibility of the stopper rod body 1 falling off.

[0043] Then, the cover plate 6 is placed and sleeved on the core rod 2. The avoidance groove 63 provided on the cover plate 6 can avoid the clamping block 111, so that the cover plate 6 is smoothly placed in the clamping assembly 5. The stopper 61 on the cover plate 6 is just clamped between two adjacent fixing plates 52, so that the clamping block 111 on the clamping beam 11 will not rotate.

[0044] The stopper rod body 1 can be effectively protected by the argon hole 7 and the connection between the argon hole 7 and the outside, and the guide plates 12 equidistantly arranged along the axial direction of the stopper rod body 1 can improve the fluidity of the molten steel during pouring, and the argon branch hole can further protect the stopper rod body 1, and the sealing block 14 integrally formed with the stopper rod body 1 can effectively ensure the sealing of the stopper rod body 1 when argon is introduced.

[0045] The operator holds the core rod 2 through the opening and closing mechanism, thereby controlling the stopper rod body 1 to control the flow rate of molten steel in the tundish.

[0046] Finally, after the pouring is completed, the operator controls the opening and closing structure to move the stopper rod body 1 upward and away from the tundish, and then completes the disassembly of the stopper rod body 1 through the lifting ring 62 on the cover plate 6.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A stopper rod for a low-carbon steel tundish, comprising a stopper rod body (1) and a stopper head brick (3) connected to one end of the stopper rod body (1), characterized in that: The end of the stopper rod body (1) away from the plugging brick (3) is provided with a connecting seat (4), the connecting seat (4) and the stopper rod body (1) are mutually abutted and coaxially arranged, the outer diameter of the connecting seat (4) is larger than the outer diameter of the stopper rod body (1), a plurality of clamping beams (11) are connected to the stopper rod body (1), the connecting seat (4) is provided with a clamping groove (41) for the clamping beams (11) to pass through, and the end of the clamping beam (11) away from the stopper rod body (1) is provided with a clamping groove (41) for the clamping beams (11) to pass through. The connecting seat (4) is provided with a stepped hole (42) inside, the end of the stepped hole (42) with the largest inner diameter is close to the stopper rod body (1), a core rod (2) is sleeved in the stepped hole (42), the core rod (2) is clamped in the stepped hole (42) of the connecting seat (4), a clamping assembly (5) which is clamped with the clamping block (111) is sleeved on the connecting seat (4), and the clamping assembly (5) is abutted against the connecting seat (4).

2. A low carbon steel tundish stopper rod according to claim 1, characterized in that: The clamping assembly (5) comprises a ring plate (51) and a plurality of fixing plates (52); the fixing plates (52) are centrally symmetrically arranged along the axis of the ring plate (51) and are integrally formed on the inner ring of the ring plate (51); a gap is formed between two adjacent fixing plates (52) for the clamping block (111) to pass through; the fixing plates (52) are rotatably clamped with the clamping block (111).

3. A low carbon steel tundish stopper rod according to claim 2, characterized in that: A cover plate (6) is provided inside the clamping assembly (5), the cover plate (6) is coaxially arranged with the core rod (2), the cover plate (6) is provided with an avoidance groove (63) for a clamping block (111) on the clamping beam (11) to pass through, the cover plate (6) is provided with a stopper (61) integrally formed therewith, and the stopper (61) is clamped between two adjacent fixing plates (52).

4. A stopper rod for a low carbon steel tundish according to claim 3, characterized in that: The cover plate (6) is provided with a plurality of lifting rings (62), which are arranged symmetrically along the axis of the cover plate (6).

5. A low carbon steel tundish stopper rod according to claim 1, characterized in that: The stopper rod body (1) is provided with a plurality of guide plates (12), which are arranged symmetrically along the axis of the stopper rod body.

6. A stopper rod for a low carbon steel tundish according to claim 5, characterized in that: The stopper rod body (1), the core rod (2) and the stopper head brick (3) are all provided with argon holes (7) which are interconnected.

7. A stopper rod for a low carbon steel tundish according to claim 6, characterized in that: A plurality of argon branch holes (13) are provided at one end of the stopper rod body (1) close to the plug head brick (3); the argon branch holes (13) are connected to the argon holes (7); and the argon branch holes (13) are provided between two adjacent guide plates (12).

8. A low carbon steel tundish stopper rod according to claim 1, characterized in that: A sealing block (14) is provided at one end of the stopper rod body (1) away from the plug head brick (3); the sealing block (14) is integrally formed with the stopper rod body (1); the sealing block (14) is sleeved in the stepped hole (42) and abuts against the core rod (2).

Images