Argon protection device for steel casting

Abstract

The utility model discloses an argon protection device for steel casting, which belongs to the technical field of steel casting and comprises a butt-joint frame, a protection cover is fixedly connected to the middle of the top end of the butt-joint frame, an argon inlet is formed in the middle of one side of the circumference of the butt-joint frame, and a shunting ring pipe is fixedly mounted in the butt-joint frame. And the inlet end of the shunting ring pipe is fixedly connected with the argon inlet through a pipeline, and a plurality of fourth gas holes with equal angles are formed in the outer side of the outer wall of the bottom end of the butt-joint frame. According to the utility model, before molten steel is poured, enough argon is introduced into the shunting ring pipe from the argon inlet, so that the pouring channel is filled with flowing argon, and the discharged argon fills and isolates the air around the lower nozzle of the steel ladle and the pouring cup, thereby greatly reducing the possibility of secondary oxidation of the molten steel and improving the pouring quality of the molten steel. Argon exhausted out of the second air hole is beneficial to forming a low-concentration argon encirclement ring on the outer side of the protective cover, outward dissipation of high-concentration argon on the inner side of the protective cover is reduced, and then it is ensured that molten steel is completely wrapped by argon during pouring.

Description

Technical Field

[0001] This utility model relates to the field of cast steel technology, and in particular to an argon gas protection device for cast steel. Background Technology

[0002] Due to flow requirements, the casting process for steel casting necessitates a certain distance between the ladle's outlet and the pouring cup. During pouring, the molten steel comes into direct contact with the atmosphere as it passes through this distance, generating a large amount of oxide inclusions that affect the quality of the cast product. Therefore, appropriate devices are needed to protect the molten steel from oxidation. Currently, steel casting often employs open-bottom ladle pouring or extends the outlet beyond the tundish surface for pouring.

[0003] A search revealed a patent with publication number CN205096529U entitled "An Argon Gas Protection Device for Cast Steel." The technical problem it addresses is the inability to isolate the molten steel at the tundish surface, leading to secondary oxidation during tundish surface renewal. Furthermore, the device requires external clamps for fixation, making it inconvenient to use. By creating an argon gas environment during casting to separate the molten steel from the air, secondary oxidation is prevented, improving casting quality. However, the following drawbacks remain: the lack of an argon gas protection mechanism means that insufficient pressure or obstructed argon gas flow at one outlet could lead to steel oxidation. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an argon gas protection device for cast steel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An argon gas protection device for cast steel includes a docking frame, a protective cover fixedly connected to the top center of the docking frame, an argon gas inlet located in the center of one side of the docking frame, a diversion ring pipe fixedly installed inside the docking frame, and the inlet end of the diversion ring pipe fixedly connected to the argon gas inlet via a pipe, multiple fourth gas holes at equal angles being opened on the outer side of the bottom outer wall of the docking frame, multiple perimeter columns at equal angles being fixedly connected to the outer side of the top outer wall of the docking frame, multiple second gas holes at equal distances being opened at both ends of the perimeter of each perimeter column, a third gas hole being opened at the top of the perimeter column, and the bottom end of the perimeter column communicating with the top of the docking frame, and multiple first gas holes being opened on the inner wall of the circumference of the protective cover.

[0007] Preferably, a plurality of equal-angled docking blocks are fixedly provided on the inner side of the bottom outer wall of the docking frame, a casting guide pipe is inserted into the bottom of the docking frame, and a plurality of slots matching the docking blocks are fixedly provided at the top of the casting guide pipe.

[0008] Preferably, the outer cross-section of the diversion ring pipe is arc-shaped, and the inner cross-section of the diversion ring pipe is rectangular.

[0009] Preferably, the top of the diversion ring pipe has multiple equally spaced exhaust ports, and the center of each exhaust port is on the same vertical line as the center of the surrounding column at its top.

[0010] Preferably, multiple equally spaced exhaust pipes are fixedly connected to the middle of the inner side of the diversion ring pipe, and the exhaust pipes are provided with openings on their circumference. The top of the exhaust pipe is fixedly connected to the inner wall of the top of the protective cover, and each exhaust pipe is located in the middle of the inner side of two adjacent rows of first air holes.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model proposes an argon gas protection device for cast steel. A casting guide pipe is installed at the bottom of the docking frame, which helps reduce the contact between the atmosphere and molten steel. Before casting, sufficient argon gas is introduced into the distribution ring pipe through the argon gas inlet. Multiple first vents are opened on the inner wall of the protective cover, and each exhaust pipe is located in the middle of the inner side of two adjacent rows of first vents, ensuring that the casting channel is filled with flowing argon gas. Multiple fourth vents at equal angles are opened on the outer side of the bottom wall of the docking frame, and a third vent is opened at the top of the column. The discharged argon gas fills the air around the ladle's outlet and pouring cup, greatly reducing the possibility of secondary oxidation of the molten steel. Multiple equidistant second vents are opened at both ends of the circumference of each column. The argon gas discharged from the second vents helps form a low-concentration argon gas ring around the outside of the protective cover, reducing the escape of high-concentration argon gas from the inside of the protective cover. This ensures that the molten steel is completely enveloped by argon gas during casting, reducing the generation of oxide inclusions and improving the quality of the cast steel product. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an argon gas protection device for cast steel proposed in this utility model;

[0014] Figure 2 This is a bottom view of the docking frame of an argon gas protection device for cast steel proposed in this utility model.

[0015] Figure 3 This is a schematic diagram of the internal structure of the docking frame of an argon gas protection device for cast steel proposed in this utility model;

[0016] Figure 4 This is a schematic diagram of the shunt ring pipe of an argon gas protection device for cast steel proposed in this utility model.

[0017] In the diagram: 1 docking frame, 2 protective cover, 3 first vent, 4 argon gas inlet, 5 casting guide pipe, 6 surrounding column, 7 second vent, 8 third vent, 9 fourth vent, 10 docking block, 11 diversion ring pipe, 12 exhaust port, 13 exhaust pipe. Detailed Implementation

[0018] Reference Figure 1-4 An argon gas protection device for cast steel includes a docking frame 1, a protective cover 2 fixedly connected to the top center of the docking frame 1, an argon gas inlet 4 opened in the middle of one side of the docking frame 1, a diversion ring pipe 11 fixedly installed inside the docking frame 1, and the inlet end of the diversion ring pipe 11 fixedly connected to the argon gas inlet 4 through a pipe, a plurality of fourth vent holes 9 with equal angles opened on the outer side of the bottom outer wall of the docking frame 1, a plurality of perimeter columns 6 with equal angles fixedly connected to the outer side of the top outer wall of the docking frame 1, a plurality of second vent holes 7 with equal distances opened at both ends of the circumference of each perimeter column 6, a third vent hole 8 opened at the top of the perimeter column 6, and the bottom end of the perimeter column 6 connected to the top of the docking frame 1, and a plurality of first vent holes 3 opened on the inner circumference of the protective cover 2.

[0019] In this utility model, a plurality of equal-angled docking blocks 10 are fixedly provided on the inner side of the outer wall of the bottom end of the docking frame 1, and a casting guide pipe 5 is inserted into the bottom end of the docking frame 1, and a plurality of slots matching the docking blocks 10 are fixedly provided at the top end of the casting guide pipe 5.

[0020] The outer cross-section of the diversion ring pipe 11 is arc-shaped, and the inner cross-section of the diversion ring pipe 11 is rectangular.

[0021] Multiple equally spaced exhaust ports 12 are opened at the middle of the top of the diversion ring pipe 11, and the center of each exhaust port 12 is on the same vertical line as the center of the surrounding column 6 at its top.

[0022] Multiple equally spaced exhaust pipes 13 are fixedly connected to the inner side of the diversion ring pipe 11, and the exhaust pipe 13 has an opening on its circumference. The top of the exhaust pipe 13 is fixedly connected to the inner wall of the top of the protective cover 2. Each exhaust pipe 13 is located in the middle of the inner side of two adjacent rows of first air holes 3.

[0023] Working principle: A casting guide pipe 5 is installed at the bottom of the docking frame 1, which helps to reduce the contact between the atmosphere and the molten steel. Before the molten steel is poured, a sufficient amount of argon gas is introduced into the diversion ring pipe 11 through the argon gas inlet 4. The inner circumference of the protective cover 2 has multiple first vent holes 3 and each exhaust pipe 13 is located in the middle of the inner side of two adjacent rows of first vent holes 3, so that the inside of the casting channel is filled with flowing argon gas. The outer side of the bottom outer wall of the docking frame 1 has multiple fourth vent holes 9 at equal angles. The top of the surrounding column 6 A third vent 8 is provided at the end, and the discharged argon gas fills the air around the bottom of the ladle and the pouring cup, thereby greatly reducing the possibility of secondary oxidation of the molten steel. In addition, multiple equally spaced second vents 7 are provided at both ends of the circumference of each column 6. The argon gas discharged from the second vents 7 helps to form a low-concentration argon gas ring around the outside of the protective cover 2, reducing the high-concentration argon gas inside the protective cover 2 from escaping outward. This ensures that the molten steel is completely enveloped by argon gas during casting, reducing the generation of oxide inclusions and improving the product quality of cast steel.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An argon protection device for casting steel, comprising a butt joint frame (1), a protection cover (2) is fixedly connected to the middle of the top end of the butt joint frame (1), an argon gas inlet (4) is formed in the middle of one side of the circumference of the butt joint frame (1), characterized in that, The docking frame (1) is internally fixedly installed with a shunt ring pipe (11), and the shunt ring pipe (11) is fixedly connected with the argon gas inlet (4) through a pipeline at the inlet end, a plurality of fourth air holes (9) with equal angles are arranged on the outer side of the bottom end outer wall of the docking frame (1), a plurality of surrounding columns (6) with equal angles are fixedly connected to the outer side of the top end outer wall of the docking frame (1), a plurality of second air holes (7) with equal distances are arranged on the circumferential two ends of each surrounding column (6), a third air hole (8) is arranged on the top end of the surrounding column (6), and the bottom end of the surrounding column (6) is communicated with the top end of the docking frame (1), and a plurality of first air holes (3) are arranged on the circumferential inner wall of the protection cover (2).

2. The argon shield for casting steel according to claim 1, wherein A plurality of docking blocks (10) with equal angles are fixedly arranged on the inner side of the bottom end outer wall of the docking frame (1), and a pouring guide pipe (5) is inserted into the bottom end of the docking frame (1), and a plurality of clamping grooves matched with the docking blocks (10) are fixedly arranged on the top end of the pouring guide pipe (5).

3. The argon shield for casting steel according to claim 1, wherein The outer side cross section of the shunt ring pipe (11) is arc-shaped, and the inner side cross section of the shunt ring pipe (11) is rectangular.

4. The argon shield for casting steel according to claim 3, wherein A plurality of exhaust ports (12) with equal distances are arranged on the top end of the shunt ring pipe (11), and the center of each exhaust port (12) is on the same vertical line with the center of the surrounding column (6) at the top end.

5. The argon shield for casting steel according to claim 3, wherein A plurality of exhaust pipes (13) with equal distances are fixedly connected to the inner side of the circumference of the shunt ring pipe (11), and the exhaust pipes (13) are provided with an opening on the circumference, the top end of the exhaust pipe (13) is fixedly connected with the inner wall of the top end of the protection cover (2), and each exhaust pipe (13) is located in the middle of the inner side of the two adjacent rows of first air holes (3).

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