Special-shaped blank continuous casting machine water blowing device and special-shaped blank continuous casting machine

Abstract

The invention discloses a special-shaped blank continuous casting machine water blowing device and a special-shaped blank continuous casting machine, belongs to the technical field of metallurgical equipment, and aims to solve the problem that cooling water on the inner arc side of an existing special-shaped blank affects the quality of a casting blank. The water blowing device of the special-shaped blank continuous casting machine comprises a left side water blowing structure (1), a middle water blowing structure (2) and a right side water blowing structure (3) which are sequentially arranged from left to right, the lower portion of the left side water blowing structure (1) is provided with a left side air nozzle (11), the lower portion of the middle water blowing structure (2) is provided with a middle air nozzle (21), and the lower portion of the right side water blowing structure (3) is provided with a right side air nozzle (31). And the spraying directions of the left side air nozzle (11), the middle air nozzle (21) and the right side air nozzle (31) are all downward. The water blowing device of the special-shaped blank continuous casting machine can blow away accumulated water in the groove in the inner arc side of the special-shaped blank, and the quality defect of the casting blank caused by the accumulated water in the inner arc side of the casting blank is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of metallurgical equipment, specifically to a water blowing device for a special-shaped billet continuous casting machine and a special-shaped billet continuous casting machine. Background Art

[0002] The shape of the billet (i.e., the special-shaped billet 4) produced by the special-shaped billet continuous casting machine is special. As Figure 1 shown, the inner arc side 41 of the special-shaped billet 4 is a large groove, and it is very easy for the cooling water of the secondary cooling spray to accumulate in the groove. The cooling water will cause uneven cooling of the inner and outer arcs of the billet, resulting in the upward warping of the billet and affecting the straightening and cutting of the billet. In addition, the cooling water flows downward and will flow through the R-angle area 42 of the billet, causing local overcooling of the R-angle to produce surface cracks and affecting the quality of the billet. Summary of the Invention

[0003] In order to solve the problem that the cooling water on the inner arc side of the special-shaped billet affects the quality of the billet, the present invention provides a water blowing device for a special-shaped billet continuous casting machine and a special-shaped billet continuous casting machine. The water blowing device for the special-shaped billet continuous casting machine can blow away the accumulated water in the groove on the inner arc side of the special-shaped billet, avoiding the quality defects of the billet caused by the accumulated water on the inner arc side of the billet.

[0004] The technical solution adopted by the embodiments of the present invention to solve its technical problems is:

[0005] A water blowing device for a special-shaped billet continuous casting machine includes a left-side water blowing structure, a middle water blowing structure, and a right-side water blowing structure arranged in sequence from left to right. A left-side air jet nozzle is arranged at the lower part of the left-side water blowing structure, a middle air jet nozzle is arranged at the lower part of the middle water blowing structure, and right-side air jet nozzles are arranged at the lower parts of the right-side water blowing structures. The jet directions of the left-side air jet nozzle, the middle air jet nozzle, and the right-side air jet nozzles are all downward.

[0006] Both the left-side water blowing structure and the right-side water blowing structure can move up and down relative to the middle water blowing structure, and the middle water blowing structure includes a main air supply pipe.

[0007] The main air supply pipe is connected with a left-side air supply branch pipe, a middle air supply branch pipe, and a right-side air supply branch pipe. The main air supply pipe can supply air to the middle air jet nozzle through the middle air supply branch pipe.

[0008] When the left-side water blowing structure is at the lower limit position, the main air supply pipe can supply air to the left-side air jet nozzle through the left-side air supply branch pipe. When the left-side water blowing structure is at the upper limit position, the main air supply pipe cannot supply air to the left-side air jet nozzle through the left-side air supply branch pipe. When the right-side water blowing structure is at the lower limit position, the main air supply pipe can supply air to the right-side air jet nozzle through the right-side air supply branch pipe. When the right-side water blowing structure is at the upper limit position, the main air supply pipe cannot supply air to the right-side air jet nozzle through the right-side air supply branch pipe.

[0009] The left water-blowing structure includes a left connecting pipe and a left connecting column. The left connecting pipe is communicated with the left jet nozzle. A first left connecting through-hole is provided on the left connecting column. The inlet end of the left connecting pipe is hermetically connected to the first left connecting through-hole correspondingly. When the left water-blowing structure is at the lower limit position, the left connecting pipe is communicated with the left air supply branch pipe; during the process of the left water-blowing structure moving upward relative to the middle water-blowing structure, the left connecting column can block the outlet end of the left air supply branch pipe.

[0010] The middle water-blowing structure further includes a middle left guiding column and a middle right guiding column. The middle left guiding column is located at the left end of the middle water-blowing structure, and the middle right guiding column is located at the right end of the middle water-blowing structure. The left connecting column is inserted into the middle left guiding column in a matching manner, and the middle left guiding column can guide the up and down movement of the left connecting column.

[0011] A second left connecting through-hole is provided on the middle left guiding column. The outlet end of the left air supply branch pipe is hermetically connected to the second left connecting through-hole correspondingly. When the left water-blowing structure is at the lower limit position, the first left connecting through-hole is hermetically connected to the second left connecting through-hole correspondingly.

[0012] The left water-blowing structure further includes a left guiding column and a left bracket. The left end of the left bracket is inserted into the left guiding column in a matching manner, and the left guiding column can guide the up and down movement of the left bracket. The right end of the left bracket is fixedly connected to the left connecting column, and the left connecting pipe is connected to the left bracket.

[0013] The left water-blowing structure and the right water-blowing structure are symmetric about the left and right and are mirror images of each other. The connection mode between the left water-blowing structure and the middle water-blowing structure is the same as the connection mode between the right water-blowing structure and the middle water-blowing structure. The left jet nozzle, the middle jet nozzle, and the right jet nozzle are all flat nozzles.

[0014] A special-shaped billet continuous casting machine, the special-shaped billet continuous casting machine includes the above-mentioned special-shaped billet continuous casting machine water-blowing device.

[0015] The beneficial effects of the embodiments of the present invention are:

[0016] 1. The water-blowing device of the special-shaped billet continuous casting machine can blow away the accumulated water in the inner arc side groove of the billet produced by the special-shaped billet continuous casting machine, avoiding the quality defects of the billet caused by the accumulated water on the inner arc side of the billet.

[0017] 2. The left water-blowing structure and the right water-blowing structure can be lifted and lowered to adapt to billets of different cross-sections, avoiding hitting the billet flange when producing small cross-section billets and affecting the normal passing of the billets.

[0018] 3. When producing small cross-section billets, the connecting pipes of the left water-blowing structure and the right water-blowing structure are staggered from the air supply branch pipes, and the air supply branch pipes will be automatically blocked, making the air supply branch pipes in a closed state, which can reduce the unnecessary consumption of the medium gas. Description of the Drawings

[0019] The accompanying drawings of the specification, which form a part of this application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0020] Figure 1 It is a schematic cross-sectional view of a shaped blank.

[0021] Figure 2 It is a schematic view of the water blowing device of the shaped blank continuous casting machine of the present invention when processing a shaped blank with a large cross-section and both the left water blowing structure and the right water blowing structure are in the lower limit position.

[0022] Figure 3 It is a schematic view of the water blowing device of the shaped blank continuous casting machine of the present invention when processing a shaped blank with a small cross-section and both the left water blowing structure and the right water blowing structure are in the upper limit position.

[0023] Figure 4 It is a schematic view of the left water blowing structure.

[0024] Figure 5 It is a schematic view of the middle water blowing structure.

[0025] Figure 6 It is a schematic view of the right water blowing structure.

[0026] Figure 7 It is a schematic view of the first left connection through hole and the second left connection through hole being connected when the left water blowing structure is in the lower limit position.

[0027] Figure 8 It is a schematic view of the first right connection through hole and the second right connection through hole being connected when the right water blowing structure is in the lower limit position.

[0028] The description of the reference numerals is as follows:

[0029] 1. Left water blowing structure; 2. Middle water blowing structure; 3. Right water blowing structure; 4. Shaped blank;

[0030] 11. Left air jet nozzle; 12. Left connecting pipe; 13. Left connecting column; 14. Left guiding column; 15. Left support;

[0031] 21. Middle air jet nozzle; 22. Main air supply pipe; 23. Left air supply branch pipe; 24. Middle air supply branch pipe; 25. Right air supply branch pipe; 26. Middle left guiding column; 27. Middle right guiding column; 28. Middle support;

[0032] 31. Right air jet nozzle; 32. Right connecting pipe; 33. Right connecting column; 34. Right guiding column; 35. Right support;

[0033] 41. Inner arc side; 42. R - corner area;

[0034] 131. First left connecting through - hole;

[0035] 261. Second left connecting through - hole;

[0036] 271. Second right connecting through - hole;

[0037] 331. First right connecting through - hole. Detailed implementation mode

[0038] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0039] For the convenience of understanding and description, the following description of the present invention adopts the absolute position relationship. Without special instructions, the orientation word "upper" represents Figure 2 the upper - side direction in Figure 2 the lower - side direction in Figure 2 the left - side direction in Figure 2 the right - side direction in Figure 2 the direction perpendicular to the paper surface in Figure 2 and pointing to the inner side of the paper surface, and the orientation word "rear" represents the direction perpendicular to the paper surface in

[0040] As Figures 2 to 3 shown, a water - blowing device for a special - shaped billet continuous caster according to an embodiment of the present invention includes a left - side water - blowing structure 1, a middle water - blowing structure 2, and a right - side water - blowing structure 3 arranged in sequence from left to right. A left - side air nozzle 11 is arranged at the lower part of the left - side water - blowing structure 1, a middle air nozzle 21 is arranged at the lower part of the middle water - blowing structure 2, and right - side air nozzles 31 are arranged at the lower parts of the right - side water - blowing structure 3. The spraying directions of the left - side air nozzle 11, the middle air nozzle 21, and the right - side air nozzle 31 are all downward (including vertically downward and obliquely downward).

[0041] The left - side air nozzle 11, the middle air nozzle 21, and the right - side air nozzle 31 can spray high - pressure gas onto the surface of the inner arc side 41 of the special - shaped billet 4, so as to blow away the accumulated water in the inner - arc - side groove of the billet produced by the special - shaped billet continuous caster, and avoid the quality defects of the billet caused by the accumulated water on the inner arc side of the billet.

[0042] As Figures 2 to 3As shown in the figure, when the special-shaped billet 4 produced by the special-shaped billet continuous caster is a large-section billet, the left jet nozzle 11, the middle jet nozzle 21 and the right jet nozzle 31 all blow high-pressure gas onto the surface of the inner arc side 41 of the special-shaped billet 4. When the special-shaped billet 4 produced by the special-shaped billet continuous caster is a small-section billet, only the middle jet nozzle 21 blows high-pressure gas onto the surface of the inner arc side 41 of the special-shaped billet 4, while the left jet nozzle 11 and the right jet nozzle 31 do not blow high-pressure gas onto the surface of the inner arc side 41 of the special-shaped billet 4.

[0043] The sum of the widths of the left water-blowing structure 1, the middle water-blowing structure 2 and the right water-blowing structure 3 is equivalent to the width of the inner arc side 41 of the special-shaped billet 4 with the largest section produced by the special-shaped billet continuous caster. The width of the middle water-blowing structure 2 is equivalent to the width of the inner arc side 41 of the special-shaped billet 4 with the smallest section produced by the special-shaped billet continuous caster.

[0044] As Figure 4 shown in the figure, a plurality of left jet nozzles 11 are arranged at the lower part of the left water-blowing structure 1, a plurality of middle jet nozzles 21 are arranged at the lower part of the middle water-blowing structure 2, and a plurality of right jet nozzles 31 are arranged at the lower part of the right water-blowing structure 3. The plurality of left jet nozzles 11, the plurality of middle jet nozzles 21 and the plurality of right jet nozzles 31 are all arranged at intervals in the left-right direction. Both the left water-blowing structure 1 and the right water-blowing structure 3 can move up and down relative to the middle water-blowing structure 2.

[0045] When the special-shaped billet 4 produced by the special-shaped billet continuous caster is a large-section billet, the left water-blowing structure 1 and the right water-blowing structure 3 are located at the lower limit position, and the plurality of left jet nozzles 11, the plurality of middle jet nozzles 21 and the plurality of right jet nozzles 31 are all at the same height; when the special-shaped billet 4 produced by the special-shaped billet continuous caster is a small-section billet, the left water-blowing structure 1 and the right water-blowing structure 3 are located at the upper limit position, and the plurality of left jet nozzles 11 and the plurality of right jet nozzles 31 are both above the plurality of middle jet nozzles 21. To adapt to billets of different sections and avoid hitting the billet flange when producing small-section billets, which affects the normal passing of the billets.

[0046] As Figure 5 shown in the figure, the middle water-blowing structure 2 includes a main air supply pipe 22. The main air supply pipe 22 is connected with a left air supply branch pipe 23, a middle air supply branch pipe 24 and a right air supply branch pipe 25. The inlet ends of the left air supply branch pipe 23, the middle air supply branch pipe 24 and the right air supply branch pipe 25 are all connected to the outlet end of the main air supply pipe 22. The main air supply pipe 22 can supply air to the middle jet nozzles 21 through the middle air supply branch pipe 24, and the middle jet nozzles 21 spray high-pressure gas.

[0047] When the left water-blowing structure 1 is in the lower limit position, the main air supply pipe 22 can supply air to the left air jet nozzle 11 through the left air supply branch pipe 23, and the left air jet nozzle 11 ejects high-pressure gas; when the left water-blowing structure 1 is in the upper limit position, the main air supply pipe 22 cannot supply air to the left air jet nozzle 11 through the left air supply branch pipe 23; when the right water-blowing structure 3 is in the lower limit position, the main air supply pipe 22 can supply air to the right air jet nozzle 31 through the right air supply branch pipe 25, and the right air jet nozzle 31 ejects high-pressure gas; when the right water-blowing structure 3 is in the upper limit position, the main air supply pipe 22 cannot supply air to the right air jet nozzle 31 through the right air supply branch pipe 25.

[0048] Specifically, as Figure 4 shown, the left water-blowing structure 1 includes a left connecting pipe 12 and a left connecting column 13. The outlet end of the left connecting pipe 12 is communicated with each left air jet nozzle 11. The left connecting column 13 is in an upright state. A first left connecting through hole 131 is provided in the upper part of the left connecting column 13. The axis of the first left connecting through hole 131 extends in the left-right direction. The inlet end of the left connecting pipe 12 is hermetically connected to the first left connecting through hole 131 correspondingly. When the left water-blowing structure 1 is in the lower limit position, the left connecting pipe 12 is communicated with the left air supply branch pipe 23; when the left water-blowing structure 1 moves upward relative to the middle water-blowing structure 2, the left connecting column 13 can close the outlet end of the left air supply branch pipe 23, making the left air supply branch pipe 23 in a closed state, and the left air jet nozzle 11 cannot eject high-pressure gas, so as to reduce unnecessary consumption of the medium gas.

[0049] As Figure 5 shown, the middle water-blowing structure 2 further includes a middle left guide post 26 and a middle right guide post 27. Both the middle left guide post 26 and the middle right guide post 27 are in an upright state. The middle left guide post 26 and the middle right guide post 27 are arranged at intervals left and right. The middle left guide post 26 is located at the left end of the middle water-blowing structure 2, and the middle right guide post 27 is located at the right end of the middle water-blowing structure 2. The left connecting column 13 is convexly and concavely inserted with the middle left guide post 26 in a matching manner, and the middle left guide post 26 can guide the up and down movement of the left connecting column 13.

[0050] A second left connecting through hole 261 is provided in the upper part of the middle left guide post 26. The axis of the second left connecting through hole 261 extends in the left-right direction. The outlet end of the left air supply branch pipe 23 is hermetically connected to the second left connecting through hole 261 correspondingly. When the left water-blowing structure 1 is in the lower limit position, the first left connecting through hole 131 is hermetically connected to the second left connecting through hole 261 correspondingly, as Figure 7 shown. When the left water-blowing structure 1 moves upward relative to the middle water-blowing structure 2, the right side surface of the left connecting column 13 can close the second left connecting through hole 261.

[0051] The middle water blowing structure 2 further includes a middle support 28. The middle support 28 is in a strip-shaped structure and extends in the left-right direction. The left end of the middle support 28 is fixedly connected to the lower end of the middle left guide post 26, and the right end of the middle support 28 is fixedly connected to the lower end of the middle right guide post 27. The middle air supply branch pipe 24 is fixedly connected to the middle support 28. The middle air supply branch pipe 24 is in an upright state. The left air supply branch pipe 23 and the right air supply branch pipe 25 are respectively located on the left and right sides of the middle air supply branch pipe 24. The left air supply branch pipe 23 and the right air supply branch pipe 25 are symmetric about the left and right and are mirror images of each other. The left air supply branch pipe 23 and the right air supply branch pipe 25 are both in a horizontal state.

[0052] The left water blowing structure 1 further includes a left guide post 14 and a left support 15. The left guide post 14 is in an upright state. The left support 15 is in a strip-shaped structure and extends in the left-right direction. The left end of the left support 15 is convexly and concavely inserted and matched with the left guide post 14. The left guide post 14 can guide the up and down movement of the left support 15. The right end of the left support 15 is fixedly connected to the lower end of the left connecting column 13. The left connecting pipe 12 is connected to the left support 15. When the left water blowing structure 1 is at the lower limit position, the left support 15 and the middle support 28 are at the same height. When the left water blowing structure 1 is at the upper limit position, the left support 15 is above the middle support 28.

[0053] The left water blowing structure 1 and the right water blowing structure 3 are symmetric about the left and right and are mirror images of each other. The connection mode between the left water blowing structure 1 and the middle water blowing structure 2 is the same as the connection mode between the right water blowing structure 3 and the middle water blowing structure 2. The left jet nozzle 11, the middle jet nozzle 21, and the right jet nozzle 31 are all flat nozzles. The jet orifice of the flat nozzle is strip-shaped, and the length direction of the jet orifice of the flat nozzle is parallel to the left-right direction.

[0054] Specifically, as Figure 6 shown, the right water blowing structure 3 includes a right connecting pipe 32 and a right connecting column 33. The outlet end of the right connecting pipe 32 is communicated with each right jet nozzle 31. The right connecting column 33 is in an upright state. A first right connecting through hole 331 is provided in the upper part of the right connecting column 33. The axis of the first right connecting through hole 331 extends in the left-right direction. The inlet end of the right connecting pipe 32 is hermetically connected to the first right connecting through hole 331 in a corresponding manner. When the right water blowing structure 3 is at the lower limit position, the right connecting pipe 32 is communicated with the right air supply branch pipe 25. When the right water blowing structure 3 moves upward relative to the middle water blowing structure 2, the right connecting column 33 can close the outlet end of the right air supply branch pipe 25, so that the right air supply branch pipe 25 is in a closed state, and the right jet nozzle 31 cannot eject high-pressure gas, which can reduce unnecessary consumption of the medium gas. The right connecting column 33 is convexly and concavely inserted and matched with the middle right guide post 27. The middle right guide post 27 can guide the up and down movement of the right connecting column 33.

[0055] At the upper part of the middle right guide post 27, a second right connection through hole 271 is provided. The axis of the second right connection through hole 271 extends in the left - right direction. The outlet end of the right - hand side air supply branch pipe 25 is hermetically connected to the second right connection through hole 271 correspondingly. When the right - hand side water - blowing structure 3 is in the lower limit position, the first right connection through hole 331 is hermetically connected to the second right connection through hole 271 correspondingly, as Figure 8 shown. When the right - hand side water - blowing structure 3 moves upward relative to the middle water - blowing structure 2, the left side surface of the right - hand side connection column 33 can seal the second right connection through hole 271.

[0056] As Figure 6 shown, the right - hand side water - blowing structure 3 further includes a right - hand side guide post 34 and a right - hand side support 35. The right - hand side guide post 34 is in an upright state. The right - hand side support 35 is in a strip - shaped structure. The right - hand side support 35 extends in the left - right direction. The right end of the right - hand side support 35 is convex - concave inserted with the right - hand side guide post 34 in a matching manner. The right - hand side guide post 34 can guide the up - and - down movement of the right - hand side support 35. The left end of the right - hand side support 35 is fixedly connected to the lower end of the right - hand side connection column 33. The right - hand side connecting pipe 32 is connected to the right - hand side support 35. When the right - hand side water - blowing structure 3 is in the lower limit position, the right - hand side support 35 and the middle support 28 are at the same height. When the right - hand side water - blowing structure 3 is in the upper limit position, the right - hand side support 35 is above the middle support 28.

[0057] The left - hand side water - blowing structure 1 and the right - hand side water - blowing structure 3 can move up and down synchronously. The left - hand side water - blowing structure 1 and the right - hand side water - blowing structure 3 are both in the upper limit position at the same time, or the left - hand side water - blowing structure 1 and the right - hand side water - blowing structure 3 are both in the lower limit position at the same time. All components of the middle water - blowing structure 2 are stationary relative to the ground. The left - hand side guide post 14 and the right - hand side guide post 34 are both stationary relative to the ground. For example, the middle water - blowing structure 2 is fixed on the surrounding foundation or structure, and the left - hand side guide post 14 and the right - hand side guide post 34 are also fixed on the surrounding foundation or structure.

[0058] Next, an asymmetric - section continuous caster is introduced. The asymmetric - section continuous caster includes the above - mentioned asymmetric - section continuous caster water - blowing device.

[0059] Next, the working process of the asymmetric - section continuous caster water - blowing device and the asymmetric - section continuous caster is introduced.

[0060] The inlet end of the air supply main pipe 22 is connected to a high - pressure air source. The high - pressure air source supplies high - pressure gas to the left - hand side air supply branch pipe 23, the middle air supply branch pipe 24, and the right - hand side air supply branch pipe 25 through the air supply main pipe 22. For example, the width of the asymmetric - section billet 4 with a large cross - section can be greater than 1000 mm, and the width of the asymmetric - section billet 4 with a small cross - section is less than 500 mm.

[0061] As Figure 2As shown, when the special-shaped bloom caster produces the special-shaped bloom 4 with a large cross-section, both the left water-blowing structure 1 and the right water-blowing structure 3 are in the lower limit position, that is, the left jet nozzles 11, the left connecting pipes 12, the left connecting columns 13, the left brackets 15, the right jet nozzles 31, the right connecting pipes 32, the right connecting columns 33 and the right brackets 35 are all in the lower limit position. All the left jet nozzles 11, the middle jet nozzles 21 and the right jet nozzles 31 blow high-pressure gas onto the surface of the inner arc side 41 of the special-shaped bloom 4 to blow away the cooling water on the surface of the inner arc side 41.

[0062] As Figure 3 As shown, when the special-shaped bloom caster produces the special-shaped bloom 4 with a small cross-section, the left water-blowing structure 1 and the right water-blowing structure 3 are in the upper limit position, that is, the left jet nozzles 11, the left connecting pipes 12, the left connecting columns 13, the left brackets 15, the right jet nozzles 31, the right connecting pipes 32, the right connecting columns 33 and the right brackets 35 are all in the upper limit position. All the middle jet nozzles 21 blow high-pressure gas onto the surface of the inner arc side 41 of the special-shaped bloom 4, and the left jet nozzles 11 and the right jet nozzles 31 do not blow high-pressure gas onto the surface of the inner arc side 41 of the special-shaped bloom 4.

[0063] As described above, only the specific embodiments of the present invention are provided, and the scope of the invention cannot be limited by them. Therefore, the replacement of equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still fall within the scope covered by the present invention. In addition, the technical features in the present invention, between technical features, between technical features and technical solutions, between technical solutions and technical solutions, and between embodiments and embodiments can be freely combined and used.

Claims

1. A water blowing device for a special-shaped billet continuous caster, characterized in that, The water-blowing device of the profiled billet continuous casting machine includes a left water-blowing structure (1), a middle water-blowing structure (2), and a right water-blowing structure (3) arranged in sequence from left to right. A left air nozzle (11) is provided at the lower part of the left water-blowing structure (1), a middle air nozzle (21) is provided at the lower part of the middle water-blowing structure (2), and right air nozzles (31) are provided at the lower parts of the right water-blowing structure (3). The jetting directions of the left air nozzle (11), the middle air nozzle (21), and the right air nozzle (31) are all downward.

2. The water blowing device for the special-shaped billet continuous casting machine according to claim 1, characterized in that, Both the left water-blowing structure (1) and the right water-blowing structure (3) can move up and down relative to the middle water-blowing structure (2), and the middle water-blowing structure (2) contains a main air supply pipe (22).

3. The water blowing device for the special-shaped billet continuous casting machine according to claim 2, characterized in that, The main air supply pipe (22) is connected with a left air supply branch pipe (23), a middle air supply branch pipe (24), and a right air supply branch pipe (25). The main air supply pipe (22) can supply air to the middle air nozzle (21) through the middle air supply branch pipe (24).

4. The water blowing device for the special-shaped billet continuous casting machine according to claim 3, characterized in that, When the left water-blowing structure (1) is at the lower limit position, the main air supply pipe (22) can supply air to the left air nozzle (11) through the left air supply branch pipe (23). When the left water-blowing structure (1) is at the upper limit position, the main air supply pipe (22) cannot supply air to the left air nozzle (11) through the left air supply branch pipe (23). When the right water-blowing structure (3) is at the lower limit position, the main air supply pipe (22) can supply air to the right air nozzle (31) through the right air supply branch pipe (25). When the right water-blowing structure (3) is at the upper limit position, the main air supply pipe (22) cannot supply air to the right air nozzle (31) through the right air supply branch pipe (25).

5. The water blowing device for the special-shaped billet continuous casting machine according to claim 4, characterized in that, The left water-blowing structure (1) contains a left connecting pipe (12) and a left connecting column (13). The left connecting pipe (12) is communicated with the left air nozzle (11). A first left connecting through hole (131) is provided on the left connecting column (13). The inlet end of the left connecting pipe (12) is hermetically connected to the first left connecting through hole (131). When the left water-blowing structure (1) is at the lower limit position, the left connecting pipe (12) is communicated with the left air supply branch pipe (23). When the left water-blowing structure (1) moves upward relative to the middle water-blowing structure (2), the left connecting column (13) can close the outlet end of the left air supply branch pipe (23).

6. The water blowing device for the special-shaped billet continuous casting machine according to claim 5, characterized in that, The middle water-blowing structure (2) further contains a middle left guiding column (26) and a middle right guiding column (27). The middle left guiding column (26) is located at the left end of the middle water-blowing structure (2), and the middle right guiding column (27) is located at the right end of the middle water-blowing structure (2). The left connecting column (13) is inserted into the middle left guiding column (26) in a matching manner, and the middle left guiding column (26) can guide the up and down movement of the left connecting column (13).

7. The water blowing device for the special-shaped billet continuous casting machine according to claim 6, wherein, A second left connecting through hole (261) is provided on the middle left guiding column (26). The outlet end of the left air supply branch pipe (23) is hermetically connected to the second left connecting through hole (261). When the left water-blowing structure (1) is at the lower limit position, the first left connecting through hole (131) is hermetically connected to the second left connecting through hole (261).

8. The water-blowing device for the special-shaped billet continuous casting machine according to claim 6, characterized in that, The left water-blowing structure (1) further includes a left guiding column (14) and a left support (15). The left end of the left support (15) is inserted into the left guiding column (14) in a matching manner. The left guiding column (14) can guide the up-and-down movement of the left support (15). The right end of the left support (15) is fixedly connected to the left connecting column (13). The left connecting pipe (12) is connected to the left support (15).

9. The water-blowing device for the special-shaped billet continuous casting machine according to claim 1, characterized in that, The left water-blowing structure (1) and the right water-blowing structure (3) are symmetric about the left and right and are mirror images of each other. The connection manner between the left water-blowing structure (1) and the middle water-blowing structure (2) is the same as that between the right water-blowing structure (3) and the middle water-blowing structure (2). The left air nozzle (11), the middle air nozzle (21), and the right air nozzle (31) are all flat nozzles.

10. A special-shaped billet continuous casting machine, characterized in that, The special-shaped billet continuous casting machine includes the water-blowing device of the special-shaped billet continuous casting machine described in Claim 1.

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