Blast furnace charging throat pipe corrugated pipe

Abstract

The invention relates to the technical field of corrugated pipes, and particularly discloses a blast furnace charging throat pipe corrugated pipe which comprises a weighing material tank lower throat pipe, an upper corrugated pipe, a lower corrugated pipe and a water-cooling rotary material distribution gearbox top, and the inner walls of a first fixing cylinder, a second fixing cylinder and a connecting cylinder are jointly and fixedly connected with a buffer layer; the outer walls of the multiple mounting rings abut against outer fabric skins, internal damping fillers are arranged between the upper corrugated pipe and the outer fabric skins and between the lower corrugated pipe and the outer fabric skins, and the upper corrugated pipe and the lower corrugated pipe are arranged in a sectional mode, so that the deformation capacity of the corrugated pipe is improved, the corrugated pipe can bear larger thermal stress, and the service life of the corrugated pipe is prolonged. And the buffer layer is made of the aluminum silicate ceramic fiber cloth, so that a part of stress can be effectively absorbed for the corrugated pipe, the buffer capacity of the corrugated pipe is enhanced, mechanical vibration generated during charging at the top of the blast furnace is effectively relieved, the corrugated pipe is not easy to crack and damage, the maintenance frequency is reduced, and the shutdown and production waiting time is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of bellows, and particularly to a bellows for a charging throat pipe of a blast furnace. Background Art

[0002] When charging materials into the blast furnace from the top of the blast furnace, a large amount of furnace materials need to pass through the water-cooled rotary distributing gearbox. In order to restrain the material flow and prevent the wear of the water-cooled rotary distributing gearbox by the furnace materials, a central throat pipe with wear-resistant inner wall is installed on the axis of the water-cooled rotary distributing gearbox. The central throat pipe is particularly important because the scouring intensity it receives is large, the angle between the material flow and the throat pipe wall is also large, and the service life of the central throat pipe is relatively short.

[0003] To ensure the stability of the blast furnace top, the steel components are all fixedly and rigidly connected. Due to the influence of thermal expansion and contraction, large thermal stresses are generated, which may cause deformation at the weak parts of the equipment in severe cases; there is also vibration generated by the charging mechanical equipment here, and the combined thermal stress generates cyclic stress, which is likely to cause the steel support to be bent and the weld to crack at this place. Therefore, steel mills mostly set bellows above the water-cooled rotary distributing gearbox to reduce the stress and vibration effects.

[0004] In the actual use process, the existing bellows can indeed play a good role in the early stage, but most of them will show different degrees of weld cracking after less than one year and experiencing tens of thousands of high-frequency vibrations, increasing the number of replacements and repairs. The downtime for each replacement of the bellows brings great losses to the steel mill. Therefore, it is necessary to propose a bellows for a charging throat pipe of a blast furnace to solve the above-mentioned problems. Summary of the Invention

[0005] To solve the problems in the above background, the present invention provides a bellows for a charging throat pipe of a blast furnace, which has better buffering ability, effectively reduces the mechanical vibration generated during charging at the top of the blast furnace, is not prone to cracking and damage, has a longer service life, and thus reduces the number of repairs to achieve the purpose of reducing the downtime for production suspension.

[0006] To achieve the above object, the present invention provides the following technical solution: A bellows for a charging throat pipe of a blast furnace, including the lower throat pipe of the weighing bin, the upper bellows, the lower bellows, and the top of the water-cooled rotary distributing gearbox. A first fixing cylinder is arranged below the lower throat pipe of the weighing bin. A first connection groove is opened on the outer surface below the first fixing cylinder. The upper bellows is sleeved on the outer wall of the first connection groove. A second fixing cylinder is arranged below the upper bellows. A second connection groove is opened on the upper outer wall of the second fixing cylinder. The lower bellows is sleeved on the outer wall of the second connection groove. A connection cylinder is arranged between the upper bellows and the lower bellows. A buffer layer is fixedly connected to the inner walls of the first fixing cylinder, the second fixing cylinder, and the connection cylinder together.

[0007] A buffer mechanism is provided on the outer sides of the upper bellows and the lower bellows. The buffer mechanism includes a plurality of connecting plates respectively fixedly connected to the outer walls of the first fixed cylinder, the second fixed cylinder, and the connecting cylinder. Mounting rings are fixedly connected to the outer walls of the plurality of connecting plates, and an outer fabric skin is abutted against the outer walls of the plurality of mounting rings. Internal shock-absorbing fillers are provided between the upper bellows, the lower bellows, and the outer fabric skin;

[0008] A connecting mechanism is provided between the lower throat of the weighing bin and the first fixed cylinder;

[0009] The top of the water-cooled rotary distributing gearbox is arranged below the second fixed cylinder, and a clamping mechanism is provided between the top of the water-cooled rotary distributing gearbox and the second fixed cylinder;

[0010] A plurality of fastening mechanisms corresponding to the mounting rings are provided on the outside of the outer fabric skin.

[0011] Preferably, the connecting structure includes a first flange fixedly connected to the outer wall of the lower throat of the weighing bin, a second flange fixedly connected to the upper end face of the first fixed cylinder and matching with the first flange, and a plurality of connecting bolts are arranged in the mounting holes of the first flange and the second flange.

[0012] Preferably, the clamping mechanism includes a third flange fixedly connected to the lower end face of the second fixed cylinder, a clamping groove is formed in the upper end face of the top of the water-cooled rotary distributing gearbox, a plurality of screw holes matching with the third flange are formed in the inner bottom surface of the clamping groove, and clamping bolts passing through the mounting holes of the third flange are threadedly connected to the interiors of the plurality of screw holes.

[0013] Preferably, the fastening mechanism includes a fastening ring arranged on the outside of the outer fabric skin, a plurality of corresponding fastening holes and through holes are respectively formed in the outer walls of the mounting ring and the fastening ring, and fastening bolts passing through the outer fabric skin and extending to the outside of the fastening holes are arranged in the interiors of the plurality of through holes.

[0014] Preferably, the two internal shock-absorbing fillers are made of aluminosilicate fiber cotton, and the internal shock-absorbing fillers are respectively abutted against the upper bellows, the lower bellows, and the outer fabric skin.

[0015] Preferably, the buffer layer is made of aluminosilicate ceramic fiber cloth.

[0016] Preferably, third connection grooves are formed in the upper and lower end faces of the connecting cylinder, and the lower end of the upper bellows and the upper end of the lower bellows are respectively sleeved on the outer walls of the two third connection grooves.

[0017] Preferably, a first sealing ring is provided between the first flange and the second flange.

[0018] Preferably, a second sealing ring is provided between the lower end surface of the third flange and the inner bottom surface of the clamping groove.

[0019] Preferably, the inner diameter of the clamping groove is larger than the diameter of the third flange, and a buffer ring abutted against the third flange is fixedly connected to the inner side wall of the clamping groove.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] In the present invention, through the segmented arrangement of the upper corrugated pipe and the lower corrugated pipe, the deformation ability of the corrugated pipe is increased, so that the corrugated pipe can withstand greater thermal stress. And since the material of the buffer layer is aluminosilicate ceramic fiber cloth, which has the characteristics of strong heat resistance and strong tear resistance, it can effectively absorb part of the stress for the corrugated pipe, enhance the buffering ability of the corrugated pipe, effectively reduce the mechanical vibration generated during the charging at the top of the blast furnace, and make the corrugated pipe not easily crack and damage;

[0022] Through the connecting plate and the mounting ring, it is convenient to arrange the outer fabric skin and the internal shock-absorbing filler on the outer sides of the upper corrugated pipe and the lower corrugated pipe. The material of the internal shock-absorbing filler is aluminosilicate fiber cotton. Through the aluminosilicate fiber cotton, the upper corrugated pipe and the lower corrugated pipe are seamlessly connected with the outer fabric skin, which can effectively absorb the stress received by the upper corrugated pipe and the lower corrugated pipe, and reduce the influence of vibration on the upper corrugated pipe and the lower corrugated pipe, making the service life of the corrugated pipe longer, thereby reducing the number of repairs to reduce the time of shutdown and waiting for production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0024] Figure 1 It is the overall structure diagram of a blast furnace charging throat pipe corrugated pipe of the present invention;

[0025] Figure 2 It is the overall sectional view of the present invention;

[0026] Figure 3 For the present invention Figure 2 The enlarged view of part A in;

[0027] Figure 4 For the present invention Figure 2 The enlarged view of part B in;

[0028] Figure 5 For the present invention Figure 2 The enlarged view of part C in;

[0029] Figure 6 This is a partial structure diagram of the present invention.

[0030] In the figure, 1 is the lower throat pipe of the weighing bin; 2 is the first flange; 3 is the first fixed cylinder; 4 is the second flange; 5 is the first sealing ring; 6 is the connecting bolt; 7 is the first connecting groove; 8 is the upper corrugated pipe; 9 is the lower corrugated pipe; 10 is the connecting cylinder; 11 is the buffer layer; 12 is the connecting plate; 13 is the mounting ring; 14 is the outer fabric skin; 15 is the fastening ring; 16 is the fastening bolt; 17 is the internal shock-absorbing filler; 18 is the top of the water-cooled rotary distributing gearbox; 19 is the clamping groove; 20 is the second fixed cylinder; 21 is the second connecting groove; 22 is the third flange; 23 is the clamping bolt; 24 is the buffer ring; 25 is the second sealing ring; 26 is the third connecting groove; 27 is the fastening hole; 28 is the through hole; 29 is the screw hole. Specific embodiments

[0031] Hereinafter, embodiments of the technical solution of the present invention will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and thus are only examples and should not be used to limit the protection scope of the present invention.

[0032] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present invention belongs.

[0033] Please refer to Figures 1 to 6 , a blast furnace charging throat corrugated pipe, including the lower throat pipe 1 of the weighing bin, the upper corrugated pipe 8, the lower corrugated pipe 9 and the top 18 of the water-cooled rotary distributing gearbox. A first fixed cylinder 3 is arranged below the lower throat pipe 1 of the weighing bin. A first connecting groove 7 is opened on the outer surface below the first fixed cylinder 3. The upper corrugated pipe 8 is sleeved on the outer wall of the first connecting groove 7. A second fixed cylinder 20 is arranged below the upper corrugated pipe 8. A second connecting groove 21 is opened on the outer wall above the second fixed cylinder 20. The lower corrugated pipe 9 is sleeved on the outer wall of the second connecting groove 21. A connecting cylinder 10 is arranged between the upper corrugated pipe 8 and the lower corrugated pipe 9. A buffer layer 11 is fixedly connected to the inner walls of the first fixed cylinder 3, the second fixed cylinder 20 and the connecting cylinder 10 together;

[0034] A buffer mechanism is arranged on the outer sides of the upper corrugated pipe 8 and the lower corrugated pipe 9. The buffer mechanism includes a plurality of connecting plates 12 respectively fixedly connected to the outer walls of the first fixed cylinder 3, the second fixed cylinder 20 and the connecting cylinder 10. Mounting rings 13 are fixedly connected to the outer walls of the plurality of connecting plates 12. The outer fabric skin 14 abuts against the outer walls of the plurality of mounting rings 13. Internal shock-absorbing fillers 17 are arranged between the upper corrugated pipe 8 and the lower corrugated pipe 9 and the outer fabric skin 14;

[0035] A connecting mechanism is provided between the lower throat pipe 1 of the weighing bin and the first fixed cylinder 3;

[0036] The top 18 of the water-cooled rotary distributing gearbox is arranged below the second fixed cylinder 20, and a clamping mechanism is provided between the top 18 of the water-cooled rotary distributing gearbox and the second fixed cylinder 20;

[0037] A plurality of fastening mechanisms corresponding to the mounting ring 13 are provided outside the outer fabric skin 14.

[0038] In this embodiment: during use, the upper bellows 8 and the lower bellows 9 are connected together through the connecting cylinder 10, and then the first fixed cylinder 3 and the second fixed cylinder 20 are fixedly connected to the other ends of the upper bellows 8 and the lower bellows 9 respectively. Since the upper bellows 8 and the lower bellows 9 are arranged in sections, the deformation ability of the bellows is increased, so that the bellows can withstand greater thermal stress. And because a buffer layer 11 is fixedly connected to the inner walls of the first fixed cylinder 3, the second fixed cylinder 20 and the connecting cylinder 10 together, and the material of the buffer layer 11 is aluminosilicate ceramic fiber cloth, which has the characteristics of strong heat resistance and strong tear resistance, it can effectively absorb part of the stress for the bellows, enhance the buffering ability of the bellows, effectively slow down the mechanical vibration generated during the charging at the top of the blast furnace, and make the bellows not easily crack and damage;

[0039] Through the connecting plate 12 and the mounting ring 13, it is convenient to arrange the outer fabric skin 14 and the internal shock-absorbing filler 17 outside the upper bellows 8 and the lower bellows 9. The material of the internal shock-absorbing filler 17 is aluminosilicate fiber cotton, and through the aluminosilicate fiber cotton, the upper bellows 8 and the lower bellows 9 are seamlessly connected with the outer fabric skin 14, which can effectively absorb the stress received by the upper bellows 8 and the lower bellows 9, and reduce the influence of vibration on the upper bellows 8 and the lower bellows 9, so that the service life of the bellows is longer, thereby reducing the number of repairs to reduce the time of suspension of production;

[0040] By providing the connecting mechanism, it is convenient to connect the lower throat pipe 1 of the weighing bin with the first fixed cylinder 3. By providing the clamping mechanism, it is convenient to connect the top 18 of the water-cooled rotary distributing gearbox with the second fixed cylinder 20. Through the fastening mechanism, the outer fabric skin 14 is made more firm.

[0041] As a technical optimization scheme of the present invention, the connection structure includes a first flange 2 fixedly connected to the outer wall of the lower throat pipe 1 of the weighing bin, a second flange 4 fixedly connected to the upper end face of the first fixed cylinder 3 and matching with the first flange 2, and a plurality of connecting bolts 6 are arranged in the mounting holes of the first flange 2 and the second flange 4.

[0042] In this embodiment: The first flange 2 and the second flange 4 are fixedly connected together through the connecting bolts 6 and the mounting holes, thereby facilitating the connection of the lower throat pipe 1 of the weighing tank and the first fixing cylinder 3.

[0043] As a technical optimization solution of the present invention, the clamping mechanism includes a third flange 22 fixedly connected to the lower end face of the second fixing cylinder 20. A clamping groove 19 is formed on the upper end face of the top 18 of the water-cooled rotary cloth feeding gearbox. A plurality of screw holes 29 matching the third flange 22 are formed on the inner bottom surface of the clamping groove 19. A clamping bolt 23 passing through the mounting hole of the third flange 22 is threadedly connected to the inside of each of the plurality of screw holes 29.

[0044] In this embodiment: By clamping the third flange 22 inside the clamping groove 19, the clamping bolt 23 passes through the mounting hole of the third flange 22 and is threadedly connected to the screw hole 29, facilitating the connection of the top 18 of the water-cooled rotary cloth feeding gearbox and the second fixing cylinder 20.

[0045] As a technical optimization solution of the present invention, the fastening mechanism includes a fastening ring 15 arranged outside the outer fabric skin 14. A plurality of corresponding fastening holes 27 and through holes 28 are respectively formed through the outer walls of the mounting ring 13 and the fastening ring 15. A fastening bolt 16 passing through the outer fabric skin 14 and extending outside the fastening hole 27 is arranged inside each of the plurality of through holes 28.

[0046] In this embodiment: By sleeving the fastening ring 15 outside the outer fabric skin 14 to align the fastening ring 15 with the mounting ring 13, and through the cooperation of the fastening hole 27, the through hole 28 and the fastening bolt 16, the outer fabric skin 14 is tightly fixed to the outer wall of the mounting ring 13.

[0047] As a technical optimization solution of the present invention, the two internal shock-absorbing fillers 17 are made of aluminosilicate fiber cotton, and the internal shock-absorbing fillers 17 are respectively in contact with the upper bellows 8, the lower bellows 9 and the outer fabric skin 14.

[0048] In this embodiment: By the aluminosilicate fiber cotton being respectively in contact with the upper bellows 8, the lower bellows 9 and the outer fabric skin 14, seamless connection between the upper bellows 8 and the lower bellows 9 and the outer fabric skin 14 can be achieved, effectively absorbing the stress received by the upper bellows 8 and the lower bellows 9, and reducing the influence of vibration on the upper bellows 8 and the lower bellows 9, making the bellows not easily crack and be damaged.

[0049] As a technical optimization solution of the present invention, the buffer layer 11 is made of aluminosilicate ceramic fiber cloth.

[0050] In this embodiment: The aluminosilicate ceramic fiber cloth has the characteristics of strong heat resistance and strong tear resistance, and can effectively absorb a part of the stress for the bellows, enhance the buffering capacity of the bellows, and make the bellows not easily crack and damage.

[0051] As a technical optimization scheme of the present invention, third connection grooves 26 are respectively opened on the upper and lower end faces of the connection cylinder 10, and the lower end of the upper bellows 8 and the upper end of the lower bellows 9 are respectively sleeved on the outer walls of the two third connection grooves 26.

[0052] In this embodiment: By respectively sleeving the lower end of the upper bellows 8 and the upper end of the lower bellows 9 on the outer walls of the two third connection grooves 26, the connection between the lower end of the upper bellows 8 and the lower bellows 9 and the connection cylinder 10 is made more firm.

[0053] As a technical optimization scheme of the present invention, a first sealing ring 5 is arranged between the first flange 2 and the second flange 4.

[0054] In this embodiment: The sealing performance between the first flange 2 and the second flange 4 is increased through the first sealing ring 5.

[0055] As a technical optimization scheme of the present invention, a second sealing ring 25 is arranged between the lower end face of the third flange 22 and the inner bottom surface of the clamping groove 19.

[0056] In this embodiment: The sealing performance between the third flange 22 and the clamping groove 19 is increased through the second sealing ring 25.

[0057] As a technical optimization scheme of the present invention, the inner diameter of the clamping groove 19 is larger than the diameter of the third flange 22, and a buffer ring 24 in contact with the third flange 22 is fixedly connected to the inner side wall of the clamping groove 19.

[0058] In this embodiment: A part of the stress is absorbed through the buffer ring 24, the vibration received by the bellows is reduced, and the service life of the bellows is prolonged.

[0059] Working principle: During use, the upper bellows 8 and the lower bellows 9 are connected together through the connection cylinder 10, and then a first fixing cylinder 3 and a second fixing cylinder 20 are fixedly connected to the other ends of the upper bellows 8 and the lower bellows 9 respectively. Since the upper bellows 8 and the lower bellows 9 are arranged in a segmented manner, the deformation ability of the bellows is increased, so that the bellows can withstand greater thermal stress. And because a buffer layer 11 is fixedly connected to the inner walls of the first fixing cylinder 3, the second fixing cylinder 20 and the connection cylinder 10, and the material of the buffer layer 11 is aluminosilicate ceramic fiber cloth, which has the characteristics of strong heat resistance and strong tear resistance, it can effectively absorb a part of the stress for the bellows, enhance the buffering capacity of the bellows, effectively reduce the mechanical vibration generated during the charging at the top of the blast furnace, and make the bellows not easily crack and damage;

[0060] Through the connecting plate 12 and the mounting ring 13, it is convenient to arrange the outer fabric skin 14 and the internal shock-absorbing filler 17 on the outer sides of the upper bellows 8 and the lower bellows 9. The material of the internal shock-absorbing filler 17 is aluminosilicate fiber cotton. By abutting the aluminosilicate fiber cotton against the upper bellows 8, the lower bellows 9 and the outer fabric skin 14 respectively, seamless connection is achieved between the upper bellows 8 and the lower bellows 9 and the outer fabric skin 14, which can effectively absorb the stress received by the upper bellows 8 and the lower bellows 9 and reduce the influence of vibration on the upper bellows 8 and the lower bellows 9, making the service life of the bellows longer, thereby reducing the number of repairs and the time of suspension of production due to equipment maintenance.

[0061] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A blast furnace charging throat bellows, comprising a weighing tank lower throat (1), an upper bellows (8), a lower bellows (9) and a water-cooled rotary distribution gear box top (18), characterized in that: A first fixed cylinder (3) is arranged below the lower throat pipe (1) of the weighing material tank, a first connecting groove (7) is provided below the outer surface of the first fixed cylinder (3), the upper bellows (8) is sleeved on the outer wall of the first connecting groove (7), a second fixed cylinder (20) is arranged below the upper bellows (8), a second connecting groove (21) is provided above the outer wall of the second fixed cylinder (20), the lower bellows (9) is sleeved on the outer wall of the second connecting groove (21), a connecting cylinder (10) is arranged between the upper bellows (8) and the lower bellows (9), and a buffer layer (11) is fixedly connected to the inner walls of the first fixed cylinder (3), the second fixed cylinder (20) and the connecting cylinder (10); A buffer mechanism is provided on the outer side of the upper bellows (8) and the lower bellows (9), and the buffer mechanism comprises a plurality of connecting plates (12) respectively fixedly connected to the outer walls of the first fixed tube (3), the second fixed tube (20) and the connecting tube (10); the outer walls of the plurality of connecting plates (12) are fixedly connected to mounting rings (13); the outer walls of the plurality of mounting rings (13) are in contact with an outer fabric skin (14); and internal shock-absorbing fillers (17) are provided between the upper bellows (8) and the lower bellows (9) and the outer fabric skin (14); A connecting mechanism is provided between the lower throat pipe (1) of the weighing tank and the first fixed cylinder (3); The top (18) of the water-cooled rotary material distribution gear box is arranged below the second fixed cylinder (20), and a clamping mechanism is arranged between the top (18) of the water-cooled rotary material distribution gear box and the second fixed cylinder (20); A plurality of fastening mechanisms corresponding to the mounting ring (13) are arranged outside the outer fabric skin (14).

2. A blast furnace charging throat bellows according to claim 1, characterized in that: The connection structure comprises a first flange (2) fixedly connected to the outer wall of the throat pipe (1) at the bottom of the weighing tank, the upper end surface of the first fixed cylinder (3) is fixedly connected to a second flange (4) matching the first flange (2), and a plurality of connection bolts (6) are arranged in the mounting holes of the first flange (2) and the second flange (4).

3. The blast furnace charging throat bellows according to claim 1, characterized in that: The clamping mechanism comprises a third flange (22) fixedly connected to the lower end surface of the second fixed cylinder (20); the upper end surface of the top (18) of the water-cooled rotary cloth gear box is provided with a clamping groove (19); the inner bottom surface of the clamping groove (19) is provided with a plurality of screw holes (29) matching the third flange (22); the inner parts of the plurality of screw holes (29) are all threadedly connected with clamping bolts (23) passing through the mounting holes of the third flange (22).

4. The blast furnace charging throat bellows according to claim 1, characterized in that: The fastening mechanism comprises a fastening ring (15) arranged outside the outer fabric skin (14); the outer walls of the mounting ring (13) and the fastening ring (15) are respectively penetrated with a plurality of corresponding fastening holes (27) and through holes (28); the interiors of the plurality of through holes (28) are each provided with fastening bolts (16) penetrating the outer fabric skin (14) and extending to the outside of the fastening holes (27).

5. The blast furnace charging throat bellows according to claim 1, characterized in that: The two internal shock-absorbing fillers (17) are made of aluminum silicate fiber cotton, and the internal shock-absorbing fillers (17) are respectively in contact with the upper corrugated tube (8), the lower corrugated tube (9) and the outer fabric skin (14).

6. The blast furnace charging throat bellows according to claim 1, characterized in that: The material of the buffer layer (11) is aluminum silicate ceramic fiber cloth.

7. The blast furnace charging throat bellows according to claim 1, characterized in that: The upper and lower end surfaces of the connecting tube (10) are both provided with third connecting grooves (26), and the lower end of the upper bellows (8) and the upper end of the lower bellows (9) are respectively sleeved on the outer walls of the two third connecting grooves (26).

8. The blast furnace charging throat bellows according to claim 2, characterized in that: A first sealing ring (5) is provided between the first flange (2) and the second flange (4).

9. The blast furnace charging throat bellows according to claim 3, characterized in that: A second sealing ring (25) is provided between the lower end surface of the third flange (22) and the inner bottom surface of the clamping groove (19).

10. The blast furnace charging throat bellows according to claim 3, characterized in that: The inner diameter of the clamping groove (19) is greater than the diameter of the third flange (22), and the inner side wall of the clamping groove (19) is fixedly connected with a buffer ring (24) that abuts against the third flange (22).

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