Auxiliary fixing device for blast furnace tuyere bushing

Abstract

The utility model discloses a blast furnace tuyere middle sleeve auxiliary fixing device belongs to blast furnace technical field, including the fixed bolster of welding in the tuyere big set outside furnace shell, the fixed bolster is inserted with the top rod, the top rod is inserted to the tuyere big set, the inserted end of top rod is articulated with the hinge seat, and the working end surface of hinge seat is in abutment with the outer edge of tuyere middle sleeve, the connecting end of fixed bolster is provided with first insertion part, the connecting end of top rod is provided with second insertion part, and the second insertion part is provided with the insertion slot, and the cooperation of insertion slot and first insertion part is realized to the insertion of top rod and fixed bolster. The utility model can guarantee that the support structure is stable and not easy to deform, improves the stability of tuyere middle sleeve installation fixed, and enhances the ability of tuyere middle sleeve resistance deformation, displacement.

Description

Technical Field

[0001] This utility model belongs to the field of blast furnace technology, and in particular relates to an auxiliary fixing device for the blast furnace tuyeres sleeve. Background Technology

[0002] A blast furnace is a sealed container subjected to high temperature and pressure. The theoretical combustion temperature in front of the tuyere can reach 2150-2350℃. Due to the airflow scouring the furnace wall, slag from the furnace wall falls off and impacts the outer edge of the tuyere. The physical impact of the slag falling off, combined with the long-term corrosion of the tuyere assembly bricks by various alkali metals during the smelting process, causes the bricks to weaken and expand in volume, leading to the bricks rising and compressing the lower part of the tuyere sleeve, causing it to warp upwards. This warping of the tuyere sleeve, along with the smaller sleeves, changes the angle within the furnace, thus altering the initial airflow distribution of hot blast entering the blast furnace, resulting in turbulent flow. This leads to a sluggish hearth, causing buildup, especially at the hearth edges where dead zones easily form. Tuyere burn-out is a common occurrence in blast furnace production.

[0003] The inner sleeve of the blast furnace tuyeres is subjected to the pressure of the rising tuyer bricks inside the furnace, as well as the deterioration of the strength, volume expansion, and plastic expansion of the carbon bricks caused by alkali metals and zinc. This causes the inner sleeve of the tuyeres to warp upwards, resulting in turbulent initial airflow into the blast furnace, which leads to inactivity of the hearth and accumulation of ash. In particular, dead corners are easily formed at the edge of the hearth, which can cause tuyeres to burn out, high-temperature gas to escape and burn equipment, and accidents such as gas poisoning. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides an auxiliary fixing device for the tuyere sleeve, which can ensure the stability of the support structure and prevent deformation, improve the stability of the tuyere sleeve installation and fixation, and enhance the tuyere sleeve's ability to resist deformation and displacement.

[0005] This utility model is implemented as follows: an auxiliary fixing device for the middle sleeve of a blast furnace tuyere includes a fixing bracket welded to the outer furnace shell of the tuyere sleeve, a top rod inserted into the fixing bracket, the top rod extending into the tuyere sleeve, and a hinge seat hinged to the extended end of the top rod, the working end face of the hinge seat abutting against the outer edge of the middle sleeve of the tuyere. The connecting end of the fixed bracket is provided with a first insertion part, and the connecting end of the top rod is provided with a second insertion part. The second insertion part is provided with an insertion groove. The top rod and the fixed bracket are connected by the insertion groove and the first insertion part.

[0006] Furthermore, the first insertion part is provided with a pin plate hole, and the second insertion part is provided with a slot. When the push rod and the fixed bracket are in the insertion state, the slot and the pin plate hole overlap to form an insertion channel, and the pin plate is inserted into the insertion channel. The slot and the pin plate hole automatically overlap to form a through insertion channel. Only the pin plate needs to be inserted to instantly complete the secondary mechanical locking. This not only prevents the push rod from axial slippage caused by high-frequency vibration in the furnace, slag impact, or thermal expansion and contraction, but also allows for quick disassembly by pulling out the pin during tuyeres maintenance, achieving rapid assembly and disassembly with "one insertion and one pull".

[0007] Furthermore, the opening direction of the pin plate hole is parallel to the insertion direction of the push rod, and the pin plate has a wedge-shaped structure, with its insertion direction perpendicular to the insertion direction of the push rod. The pin plate hole is opened along the insertion direction of the push rod and locked with a wedge-shaped pin plate perpendicular to this direction. The wedge-shaped pin plate can be self-locking by being hammered in once, and can be easily removed by gently tapping it in the opposite direction. This achieves a pre-tightening force for fixing the push rod to the middle sleeve, enhancing the middle sleeve's resistance to deformation and displacement, and reducing the occurrence of upward warping.

[0008] Furthermore, the first plug-in part is a plate-shaped structure, and the second plug-in part is two plug-in plates arranged in parallel and spaced apart, with a plug-in groove formed between the two plug-in plates to cooperate with the first plug-in part.

[0009] Furthermore, the extension end of the push rod is provided with a pin hole, and the hinge seat is hinged to the extension end of the push rod through the cooperation of the pin shaft and the pin hole.

[0010] Furthermore, the fixing bracket is an L-shaped steel component, and the fixing bracket is made of steel plates spliced ​​into a cross-shaped cross section. This can effectively improve the overall deformation resistance of the fixing bracket.

[0011] The advantages and technical effects of this utility model are as follows: By adopting the above technical solution, the support structure can be guaranteed to be stable and not easily deformed, the stability of the air outlet middle sleeve installation and fixation can be improved, and the ability of the air outlet middle sleeve to resist deformation and displacement can be enhanced; the hinge structure at the front end of the top rod realizes the tight contact between the top rod and the middle sleeve, preventing the fixation failure or damage to the end face of the middle sleeve due to the two contact surfaces not being solid, ensuring the reliability of the contact surface and protecting the end face of the middle sleeve from damage.

[0012] The plug-in connection between the top rod and the fixed bracket ensures quick assembly and disassembly during installation and maintenance, and allows for adaptive micro-movement of the hinge seat during thermal expansion and contraction of the tuyeres, avoiding stress concentration. This directly suppresses upward warping of the tuyeres without altering the original tuyeres brick lining, maintaining stable airflow and effectively reducing the upward or downward movement of the tuyeres sleeve under stress. This minimizes airflow variations within the blast furnace, reduces gas leakage at the tuyeres, and prevents gas poisoning accidents. This auxiliary fixing device for the tuyeres sleeve is rationally designed, simple in structure, convenient to operate on-site, and reliable in its performance, meeting on-site requirements. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure installation provided in an embodiment of this utility model; Figure 2 This is an exploded view of the overall structure provided in an embodiment of this utility model.

[0014] In the diagram: 1. Tubular sleeve; 2. Tubular middle sleeve; 3. Furnace shell; 4. Fixed bracket; 4-1. First insertion part; 4-2. Pin plate hole; 5. Top rod; 5-1. Second insertion part; 5-2. Insertion groove; 5-3. Slot; 6. Hinge seat; 7. Pin plate. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0016] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] like Figure 1 and Figure 2 As shown, this application provides an auxiliary fixing device for a blast furnace tuyere sleeve, including a fixing bracket 4 welded to the outer furnace shell 3 of the tuyere sleeve 1. A push rod 5 is inserted into the fixing bracket 4, extending into the tuyere sleeve 1. A hinge seat 6 is hinged to the extended end of the push rod 5, and the working end face of the hinge seat 6 abuts against the outer edge of the tuyere sleeve 2. Specifically, a pin hole is provided at the extended end of the push rod 5, and the hinge seat 6 is hinged to the extended end of the push rod 5 through the cooperation of a pin shaft and the pin hole, allowing the hinge seat 6 to rotate freely within a certain angle range. The design of the hinge seat 6 enables it to automatically adapt to contact with the end face of the tuyere sleeve 2, avoiding local stress concentration or damage to the surface of the sleeve due to poor contact.

[0018] The connecting end of the fixed bracket 4 is provided with a first insertion part 4-1, and the connecting end of the top rod 5 is provided with a second insertion part 5-1. The second insertion part 5-1 is provided with an insertion groove 5-2. The top rod 5 and the fixed bracket 4 are connected by the insertion groove 5-2 and the first insertion part 4-1.

[0019] Furthermore, the first insertion part 4-1 is provided with a pin plate hole 4-2, and the second insertion part 5-1 is provided with a slot 5-3. When the top rod 5 and the fixed bracket 4 are in the insertion state, the slot 5-3 and the pin plate hole 4-2 overlap to form an insertion channel, and the pin plate 7 is inserted into the insertion channel. The slot 5-3 and the pin plate hole 4-2 automatically overlap to form a through insertion channel. Only the pin plate 7 needs to be inserted to instantly complete the secondary mechanical locking, which not only prevents the top rod 5 from axial slippage caused by high-frequency vibration in the furnace, slag impact, or thermal expansion and contraction, but also allows for quick disassembly by pulling out the pin during tuyeres maintenance, realizing quick assembly and disassembly with "one insertion and one pull".

[0020] Furthermore, the pin hole 4-2 is an elongated hole, and the opening direction of the pin hole 4-2 is parallel to the insertion direction of the top rod 5. The pin plate 7 has a wedge-shaped structure, and the insertion direction of the pin plate 7 is perpendicular to the insertion direction of the top rod 5. The pin hole 4-2 is opened along the insertion direction of the top rod 5, and locked with a wedge-shaped pin plate 7 perpendicular to this direction. The wedge-shaped pin plate 7 can be self-locked by being hammered in once, and can be removed by simply tapping it in the opposite direction. This achieves the pre-tightening force for fixing the top rod 5 to the middle sleeve, enhancing the middle sleeve's ability to resist deformation and displacement, and reducing the occurrence of upward warping. The pin plate 7 pushes the top rod 5 towards the middle sleeve 2 of the air vent through the slot 5-3 of the top rod 5. The displacement of the top rod 5 causes the hinge seat 6 to press against the end face of the middle sleeve, forming a stable pre-tightening force, thereby effectively resisting the upward warping or displacement of the middle sleeve 2 of the air vent caused by external forces. The wedge-shaped pin plate 7 facilitates quick on-site installation and disassembly. No complex tools are required; simply hammering is sufficient for fastening or loosening, ensuring efficient maintenance and adjustment. During installation and use, hammering the pin plate 7 moves the push rod 5 forward, causing the hinge seat 6 to press against the end face of the middle sleeve. This achieves a pre-tightening force on the middle sleeve by the push rod 5, enhancing the middle sleeve's resistance to deformation and displacement, and reducing the occurrence of upward warping.

[0021] Specifically, the first plug-in part 4-1 is a plate-shaped structure, and the second plug-in part 5-1 is two plug-in plates arranged in parallel and spaced apart. A plug-in groove 5-2 is formed between the two plug-in plates to cooperate with the first plug-in part 4-1.

[0022] Preferably, the fixing bracket 4 is an L-shaped steel component, and the fixing bracket 4 is made of steel plates spliced ​​into a cross-shaped cross section. This can effectively improve the overall deformation resistance of the fixing bracket 4.

[0023] By adopting the above technical solution, the support structure can be guaranteed to be stable and not easily deformed, the stability of the air outlet middle sleeve 2 installation and fixation can be improved, and the ability of the air outlet middle sleeve 2 to resist deformation and displacement can be enhanced; the hinge structure at the front end of the top rod 5 realizes the tight contact between the top rod 5 and the middle sleeve, preventing fixation failure or damage to the end face of the middle sleeve due to the two contact surfaces not being solid, ensuring the reliability of the contact surface and protecting the end face of the middle sleeve from damage.

[0024] The plug-in connection between the top rod 5 and the fixed bracket 4 ensures quick assembly and disassembly during installation and maintenance, and allows for adaptive micro-movement via the hinge seat 6 during thermal expansion and contraction of the tuyeres, preventing stress concentration. This directly suppresses upward warping of the tuyeres without altering the original tuyeres brick lining, maintaining stable airflow and effectively reducing the upward or downward movement of the tuyeres sleeve 2 under stress. This reduces the resulting changes in airflow within the blast furnace, minimizes gas leakage at the tuyeres, and prevents gas poisoning accidents. This auxiliary fixing device for the tuyeres sleeve is rationally designed, simple in structure, convenient to operate on-site, and reliable in its performance, meeting the requirements of on-site use.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An auxiliary fixing device for the inner sleeve of a blast furnace tuyere, characterized in that, The system includes a fixed bracket welded to the outer furnace shell of the tuyere sleeve, a top rod inserted into the fixed bracket, the top rod extending into the tuyere sleeve, and a hinge seat hinged to the extended end of the top rod, the working end face of the hinge seat abutting against the outer edge of the tuyere sleeve. The connecting end of the fixed bracket is provided with a first insertion part, and the connecting end of the top rod is provided with a second insertion part. The second insertion part is provided with an insertion groove. The top rod and the fixed bracket are connected by the insertion groove and the first insertion part.

2. The auxiliary fixing device for the blast furnace tuyeres sleeve according to claim 1, characterized in that, The first insertion part is provided with a pin plate hole, and the second insertion part is provided with a slot. When the top rod and the fixed bracket are in the insertion state, the slot and the pin plate hole overlap to form an insertion channel, and a pin plate is inserted into the insertion channel.

3. The auxiliary fixing device for the blast furnace tuyeres sleeve according to claim 2, characterized in that, The opening direction of the pin plate hole is parallel to the insertion direction of the push rod. The pin plate has a wedge-shaped structure, and the insertion direction of the pin plate is perpendicular to the insertion direction of the push rod.

4. The auxiliary fixing device for the blast furnace tuyeres sleeve according to claim 1, characterized in that, The first plug-in part is a plate-shaped structure, and the second plug-in part is two plug-in plates arranged in parallel and spaced apart, with a plug-in groove formed between the two plug-in plates to cooperate with the first plug-in part.

5. The auxiliary fixing device for the blast furnace tuyeres sleeve according to claim 1, characterized in that, The extension end of the push rod is provided with a pin hole, and the hinge seat is hinged to the extension end of the push rod by the cooperation of the pin shaft and the pin hole.

6. The auxiliary fixing device for the blast furnace tuyeres sleeve according to claim 1, characterized in that, The fixed bracket is an L-shaped steel component, and the fixed bracket is made of steel plates spliced ​​into a cross-shaped cross section.

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