Hydraulic dismounting device for small sleeve in blast-furnace tuyere
The hydraulic dismantling device solved the problems of deformation and damage during the dismantling of small and medium-sized tuyeres in blast furnaces, achieving efficient and safe dismantling and assembly of small and medium-sized tuyeres, reducing production costs and labor intensity, and improving the reuse rate of small and medium-sized tuyeres.
Patent Information
- Application Number
- CN202511278693.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2025-10-21
AI Technical Summary
The disassembly of the small sleeves in the blast furnace tuyeres is subject to deformation, high damage rate, complex operation, high labor intensity, and many safety hazards, which affects the blast furnace production efficiency and cost.
A hydraulic disassembly device for small and medium sleeves in blast furnace tuyeres was designed. It utilizes hydraulic cylinders and anti-slip toothed pull plates, and disassembles the small and medium sleeves through support plates and pushcart frames, reducing manual operation and improving disassembly and assembly efficiency and safety.
It reduced the damage rate of small and medium-sized equipment, improved disassembly efficiency, reduced labor intensity and safety risks, significantly reduced production costs and coke consumption, and increased the reuse rate of small and medium-sized equipment.
Smart Images
Figure CN120816294A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of blast furnace production, and in particular to a hydraulic disassembly device for small sleeves in blast furnace tuyere. Background Art
[0002] In blast furnace ironmaking, see Figure 1 The small and medium sleeves of the blast furnace tuyere are coaxially nested and connected. The extended end of the medium sleeve covers the small sleeve, which then delivers hot air into the blast furnace. The hot air temperature is generally as high as 1200°C. The medium and small sleeves are made of copper and require water cooling to protect the components. After long-term use, the medium and small sleeves are prone to deformation, burning, and leaking.
[0003] After the middle sleeve is deformed, the direction of the small sleeve cannot be accurately adjusted, normal blowing operation cannot be performed, and normal open and uniform spraying cannot be achieved, which affects the blowing direction of the coal gas flow in the furnace; secondly, after the middle sleeve is deformed, the water inlet pipe of the small sleeve is compressed and deformed, affecting the circulating water supply of the cooling water of the small sleeve. When the furnace condition fluctuates, the cooling water inlet pipe of the small sleeve is unevenly stressed, resulting in cracks in the weld of the small sleeve water inlet pipe or burning and leakage. The blast furnace is forced to stop blowing and the tuyere small sleeve needs to be replaced.
[0004] At present, the installation position of the blast furnace tuyere small sleeve is between the tuyere platform and the iron-making yard platform. Moreover, the small sleeve is not only close to the furnace shell, but the space in this area is long and narrow, and the existing mechanical equipment cannot operate close to it, which brings more inconvenience to the disassembly and installation work and makes the operation complicated.
[0005] The existing operation for dismantling the small sleeve is to drill into the furnace shell with tools such as a sledgehammer and a steel chisel to dismantle and install it manually. However, iron-making blast furnaces now tend to be large-scale, and the sizes of the small and medium tuyere sleeves have also increased accordingly, with the maximum weight reaching about 600 kilograms. The existing method relies solely on manual labor to complete the dismantling and installation of the small sleeve, which is time-consuming and labor-intensive. Each replacement requires 6 to 8 people and takes 6 hours to complete. The labor intensity is high, the time is long, and there are many safety hazards, which affects the progress of blast furnace maintenance.
[0006] When the tuyere sleeve is severely deformed and difficult to remove, oxygen must be introduced to raise its temperature and adjust the position of the deformation to facilitate removal. However, this process easily generates smoke and dust, polluting the environment. If oxygen burns the tuyere sleeve carelessly, it can also burn the sleeve. There is also a 60% chance of the sleeve being damaged, making it unusable. This increases maintenance time and delays air supply.
[0007] Each replacement of a small or medium-sized blast furnace requires a lengthy blast furnace shutdown for repairs. Upon restart, a large amount of coke must be added to restore the blast furnace. With a normal production plant containing over 20 small or medium-sized blast furnaces, the resulting losses from these repairs can reach over 5 million yuan. This increases production costs, and the current market price of small or medium-sized blast furnaces is high. The damage rate of blast furnaces removed using existing methods can reach 60%, making them irreusable, further increasing production costs.
[0008] The above problems cannot be solved, which affects blast furnace production and blast furnace operation.
[0009] The information disclosed in the background section is only intended to enhance understanding of the overall background of the invention and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to a person of ordinary skill in the art. Summary of the Invention
[0010] In response to the above technical problems, the present application provides a hydraulic disassembly device for small and medium-sized sleeves of blast furnace tuyere, which is suitable for disassembling and assembling small and medium-sized sleeves of blast furnace smelting tuyere in a narrow installation environment. It can improve the disassembly and assembly efficiency, reduce manpower consumption, protect the medium and small sleeves, and has a simple structure, ingenious design, low manufacturing cost, safety and reliability, and easy maintenance.
[0011] The present application provides a hydraulic disassembly device for a blast furnace tuyere small and medium sleeve, comprising: a small sleeve and a medium sleeve; the first end diameter of the small sleeve is smaller than the second end; the first end diameter of the medium sleeve is smaller than the second end; the second end of the small sleeve is inserted into the first end of the medium sleeve; and the device comprises: a support plate, a pair of hydraulic cylinders, a main pull rod, a trolley frame, and an anti-slip tooth pull plate; A through hole is provided in the center area of the support plate, and the second end of the middle sleeve is inserted into the through hole; the hydraulic cylinder is symmetrically provided on the end surface of the pusher frame facing the support plate; The main pull rod is connected to the trolley frame and is coaxial with the middle sleeve and the small sleeve; the movable end and the operating end of the main pull rod are respectively extended to the two ends of the trolley frame; the anti-slip tooth pull plate is hinged on the movable end of the main pull rod; During installation, the anti-slip tooth pull plate extends out of the first end of the small sleeve and then retracts until the anti-slip tooth pull plate abuts the first end of the small sleeve; during disassembly, the hydraulic cylinder pushes the support plate, the pusher frame moves backward relative to the support plate, and drives the small sleeve to come out of the middle sleeve.
[0012] Preferably, it comprises: a welding plate and a movable sliding hammer; the welding plate is sleeved on the operating end of the main pull rod; the movable sliding hammer is sleeved on the main pull rod and is slidably arranged between the welding plate and the trolley frame.
[0013] Preferably, it comprises: a handle rod; the handle rod is symmetrically arranged on both sides of the movable slide hammer.
[0014] Preferably, it comprises: a plug-in plate connector; the plug-in plate connector is arranged on the movable end of the main pull rod; a through slot is provided on the plug-in plate connector; and the anti-slip tooth pull plate is hinged to the through slot.
[0015] Preferably, the cart frame comprises: a frame body, a connecting frame, and wheels arranged in pairs; the frame body and the connecting frame are connected; both sides of the connecting frame are hinged to the wheels respectively; and the main pull rod is installed on the frame body.
[0016] Preferably, the anti-slip tooth pull plate includes: an arc plate and a stop bar; the stop bar is provided on one side of the arc plate; the length of the stop bar is greater than the diameter of the first end of the small sleeve; when installed, the stop bar abuts against the first end of the small sleeve.
[0017] Preferably, the anti-slip tooth pull plate includes: a limiting rod; a limiting rod is provided on one side of the arc plate; and the limiting rod is in limiting contact with the plug-in plate connector.
[0018] Preferably, it comprises: a hinge rod; a hinge hole is provided at the center of the arc plate; the hinge rod is passed through the hinge hole and is installed on the extended end of the plug-in plate connector.
[0019] Preferably, it comprises: a plurality of reinforcing plates; the main pull rod is connected to the frame body via the reinforcing plates.
[0020] Another aspect of the present application further provides a method for disassembling a small sleeve in a blast furnace tuyere, comprising the following steps: 1) After assembling the device as described above, insert the second end of the middle sleeve into the through hole of the support plate, and push the main pull rod to insert the anti-slip tooth pull plate into the outside of the first end of the small sleeve; 2) Press down the operating end of the main pull rod, lift the movable end of the main pull rod, and retract the main pull rod until the anti-slip tooth pull plate abuts against the first end of the small sleeve. After retracting it several times to confirm reliable abutment, start the hydraulic cylinder to push the support plate and the trolley frame away from each other until the small sleeve is out of the middle sleeve.
[0021] The beneficial effects of this application include: 1) The hydraulic disassembly device for small and medium-sized sleeves of blast furnace tuyere provided in this application is suitable for replacing small and medium-sized sleeves in blast furnace tuyere areas with narrow platforms, which can reduce labor, improve production efficiency and reduce production costs.
[0022] 2) The hydraulic disassembly device for small and medium-sized sleeves of blast furnace tuyere provided in this application can remove the small and medium-sized sleeves intact after using the device. The removed small and medium-sized sleeves will not be damaged by edge pulling. The reuse rate of small and medium-sized sleeves is increased to 95%, and the damage rate of medium sleeves is reduced from 60% to 5%, effectively reducing production costs: assuming that the service life of small and medium-sized sleeves is 1 year, each blast furnace now has 24 medium and small sleeves for tuyere, and 7 to 8 small and medium-sized sleeves need to be calibrated every year, excluding burnout and water leakage. The price of a single medium sleeve is calculated at 100,000 yuan, and the price of a single small sleeve is calculated at 50,000 yuan. The replacement and calibration of the medium sleeve of a single furnace tuyere by using this device can save more than 800,000 yuan in coke used in blast furnace recovery compared with the existing method, and the replacement and calibration of the small sleeve of a single furnace tuyere can save more than 400,000 yuan in coke used in blast furnace recovery compared with the existing method.
[0023] 3) The hydraulic disassembly device for small and medium sleeves of blast furnace tuyere provided in this application takes about 2 hours to replace the medium sleeve and about 40 minutes to replace the small sleeve, saving 400,000 to 800,000 yuan of coke per piece.
[0024] 4) The hydraulic disassembly device for small and medium-sized sleeves in blast furnace tuyeres provided in this application replaces existing heavy manual labor such as prying and pushing, freeing workers from high-risk, high-intensity tasks. It enables rapid replacement of modular pullers and adapts to small and medium-sized sleeves in different blast furnace models, eliminating the need for customization for a single device and demonstrating high versatility. Operators can remotely control the device, reducing exposure to high temperatures and gas, thereby mitigating safety risks at the source. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic diagram of the main cross-section of an existing blast furnace tuyere; Figure 2 A three-dimensional schematic diagram of a hydraulic disassembly device for a small sleeve in a blast furnace tuyere in at least one embodiment provided in the present application; Figure 3 A three-dimensional schematic diagram of an anti-slip tooth pull plate in at least one embodiment provided in this application; Figure 4 A schematic diagram of the installation state of the anti-slip tooth pull plate on one end of the main pull rod in at least one embodiment provided in the present application; Figure 5 A schematic diagram of the installation state of the anti-slip tooth pull plate in the small sleeve in at least one embodiment provided in the present application; Figure 6 Schematic diagram of the hydraulic disassembly device for the small sleeve of the blast furnace tuyere in use in at least one embodiment provided in the present application; a is the assembled state; b is the disassembled state; Legend: Main pull rod 23, movable slide hammer 22, hydraulic cylinder 21, plug plate connector 2, small sleeve 12, support plate 11, middle sleeve 1, support frame 113, welding pad 221, handle rod 222, anti-slip tooth pull plate 231, wheel 31, trolley frame 3, reinforcement plate 311, connecting frame 312, support clamp 115, arc plate 232, hinge hole 233, limit rod 234, blocking strip 235, through groove 212, hinge rod 211. DETAILED DESCRIPTION
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.
[0028] The technical means that are not described in detail in this application and are not used to solve the technical problems of this application are all set according to the common knowledge in this field, and can be implemented in a variety of common knowledge settings.
[0029] See also Figures 1 to 6 The hydraulic disassembly device for the small and medium sleeves of the blast furnace tuyere provided in this application includes: a main pull rod 23, a movable slide hammer 22, which plays a role in applying force, a hydraulic cylinder 21, a plug-in connector 2, a small sleeve 12, a support plate 11, a medium sleeve 1, a support frame 113, a welding plate 221, a handle bar 222, an anti-slip tooth pull plate 231, a wheel 31, a trolley frame 3, a reinforcement plate 311, a connecting frame 312, and a support clamp 115; A through hole is provided at the center of the support plate 11, the middle sleeve 1 is inserted into the through hole, and a trolley frame 3 is provided outside the end with a larger diameter of the middle sleeve 1; wheels 31 are symmetrically provided at the lower part of the trolley frame 3 for easy movement; a main pull rod 23 is installed in the center area of the trolley frame 3 opposite to the through hole; the main pull rod 23 coincides with the central axis of the through hole; both ends of the main pull rod 23 extend out of the trolley frame 3 respectively; a plug-in connector 2 is provided on the movable end of the main pull rod 23, and an anti-slip tooth pull plate 231 is hingedly provided on the plug-in connector 2; The main pull rod 23 has a plug-in connector 2 disposed on its movable end. A through slot 212 is provided on the plug-in connector 2. A hinge rod 211 is mounted on one end of the through slot 212. An anti-slip tooth pull plate 231 is hingedly mounted on the hinge rod 211. The anti-slip tooth pull plate 231 can rotate around the hinge rod 211 within the through slot 212. A limit rod 234 is provided on the anti-slip tooth pull plate 231. The limit rod 234 is in contact with the plug-in connector 2. When the anti-slip tooth pull plate 231 rotates around the hinge rod 211, the limit rod 234 limits the rotation angle of the anti-slip tooth pull plate 231.
[0030] The anti-slip tooth pull plate 231 includes: a circular plate 232, a hinge hole 233, a limit rod 234, and a stop bar 235. The stop bar 235 is provided on one side of the circular plate 232. The length of the stop bar 235 is greater than the distal diameter of the small sleeve 12, and it abuts against the small sleeve 12 when the small sleeve 12 is removed. The hinge hole 233 is provided in the center of the circular plate 232 for articulation with the hinge rod 211. A limit rod 234 is provided on one side of the circular plate 232 near the stop bar 235 to limit the rotation angle of the circular plate 232.
[0031] Hydraulic cylinders 21 are symmetrically arranged on the end surface of the cart frame 3 facing the support plate 11 ; the movable end of the hydraulic cylinder 21 abuts against the support plate 11 , thereby applying a thrust to remove the small sleeve 12 from the middle sleeve 1 .
[0032] During installation, the diameter of the first end of the small sleeve 12 is smaller than the second end; the second end of the small sleeve 12 is inserted into the first end of the middle sleeve 1; the diameter of the first end of the middle sleeve 1 is smaller than the second end, and the second end of the middle sleeve 1 is inserted into the central through hole of the support plate 11. At this time, the small sleeve 12 is sleeved into the first end of the middle sleeve 1, and the anti-slip tooth pull plate 231 is hinged in the through groove 212. The anti-slip tooth pull plate 231 and the main pull rod 23 are at a 45° angle, and the connecting strip 235 is set toward the first end of the small sleeve 12. This insertion angle can be achieved by adjusting the tightness of the hinge, which will not be repeated here. The tightness is based on whether the anti-slip tooth pull plate 231 and the main pull rod 23 can rotate after abutting against an obstacle. At this time, the operating end of the main pull rod 23 is operated to extend the anti-skid tooth pull plate 231 into the small sleeve 12. Then, the operator presses down the operating end of the main pull rod 23, thereby lifting the movable end of the main pull rod 23 extending into the small sleeve 12, so that one end of the connecting bar 235 abuts against the diameter of the small sleeve 12. Then, the operating end of the main pull rod 23 is operated to make the main pull rod 23 parallel to the ground, and then the main pull rod 23 is pulled back to drive the anti-skid tooth pull plate 231 to retract and move until both ends of the connecting bar 235 abut against the small sleeve 12. This process can be repeated many times to complete the installation when reliable abutment is achieved. Drag the main pull rod 23 several times to confirm that the anti-skid tooth pull plate 231 and the small sleeve 12 are reliably abutted, and then perform the disassembly operation. If the anti-skid tooth pull plate 231 is detached at this time, perform the installation operation again. The movable end of the main pull rod 23 extends out of the first end of the small sleeve 12 and is then retracted to the anti-skid tooth pull plate 231 to engage with the first end of the small sleeve 12.
[0033] During disassembly, after installation is completed, the operator activates the hydraulic cylinders 21 symmetrically arranged on both sides of the trolley frame 3 to apply force evenly. The hydraulic cylinders 21 push the support plate 11, and the trolley frame 3 moves backward relative to the support plate 11, pulling the small cover 12 out of the middle cover 1. This process does not require the operator to pull, and the hydraulic cylinders 21 complete the pulling of the small cover 12, which saves time, effort and efficiency.
[0034] In a specific embodiment, it includes: a movable slide hammer 22; the movable slide hammer 22 is slidably mounted on the main pull rod 23 and abuts against the welding pad 221 on the main pull rod 23; the movable slide hammer 22 is slidably mounted on the main pull rod 23 on the outside of the cart frame 3; the handle rod 222 is symmetrically arranged on the opposite side walls of the movable slide hammer 22. When it is necessary to determine whether it is installed in place, the operator can hold the handle rod 222 to pull the movable slide hammer 22 for easy force application. At the same time, when the anti-slip tooth pull plate 231 enters the outer area of the small sleeve 12 and encounters impurities blocking the pull-back movement, the operator pulls the main pull rod 23 to allow the anti-slip tooth pull plate 231 to clean the impurities on the inner wall, thereby ensuring that the anti-slip tooth pull plate 231 is reliably abutted against the small sleeve 12.
[0035] In one embodiment, the cart frame 3 includes a frame body, a connecting frame 312, and wheels 31. The wheels 31 are symmetrically arranged on both sides of the connecting frame 312. The frame body is arranged on the top surface of the connecting frame 312. The connecting frame 312 is hingedly connected to the wheels 31. The center area of the frame body is arranged directly opposite the through hole in the support plate 11. The main pull rod 23 is installed on the frame body, thereby enabling the frame body to rotate relative to the wheels 31.
[0036] In a specific embodiment, it includes: multiple reinforcement plates 311; the main pull rod 23 and the frame are connected through the multiple reinforcement plates 311; it is beneficial to improve the force reliability of the main pull rod 23 and increase the contact area between the main pull rod 23 and the frame.
[0037] In one embodiment, the hydraulic cylinders 21 are symmetrically arranged on the frame.
[0038] In one embodiment, a support snap ring 115 is provided on the side of the support plate 11 facing the middle sleeve 1 and on the outer periphery of the through hole of the support plate 11. It is used to increase the force bearing area between the support plate 11 and the middle sleeve 1 and improve the operation stability when pulling the small sleeve 12.
[0039] In a specific embodiment, it includes: support frames 113 arranged in pairs; the support frames 113 are symmetrically arranged on the side of the support plate 11 facing the middle sleeve 1, and the height of the support frames 113 can be adjusted according to the trolley frame 3 to ensure that the main pull rod 23 installed on the trolley frame 3 and the central through hole of the support plate 11 are coaxial. By setting the support frames 113, the force reliability of the support plate 11 during operation can be improved.
[0040] In a specific embodiment, a support snap ring 115 is provided on the first side wall of the support plate 11 to increase the support force of the support plate 11 on the centering sleeve 1 and improve operational stability.
[0041] In a specific embodiment, the stroke of the hydraulic cylinder 21 can be designed based on the spacing between the support plate 11, the trolley frame 3, and the first end of the small sleeve 12, which is not described here.
[0042] This device is already in operation at Xianfu Steel. During its operation, the damage rate of the middle sleeve has dropped from 60% to 5%, and the reuse rate has increased to 95%. For a single blast furnace (24 tuyeres), this device saves approximately 500,000 yuan annually on the middle sleeve and approximately 350,000 yuan on the small sleeve. It also significantly reduces downtime and coke consumption (estimated annual savings of 30.36 million yuan), significantly reducing the risk of production downtime losses. The time required to replace the middle sleeve has been reduced from 6 hours to 2 hours, and the small sleeve to approximately 40 minutes.
[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A hydraulic disassembly device for a small sleeve of a blast furnace tuyere, comprising: A small sleeve (12) and a middle sleeve (1); the diameter of the first end of the small sleeve (12) is smaller than the diameter of the second end; the diameter of the first end of the middle sleeve (1) is smaller than the diameter of the second end; the second end of the small sleeve (12) is inserted into the first end of the middle sleeve (1); It is characterized by: It comprises: a support plate (11), a hydraulic cylinder (21) arranged in pairs, a main pull rod (23), a pusher frame (3), and an anti-slip tooth pull plate (231); A through hole is provided in the central area of the support plate (11), and the second end of the middle sleeve (1) is inserted into the through hole; the hydraulic cylinder (21) is symmetrically provided on the end surface of the trolley frame (3) facing the support plate (11); The main pull rod (23) is connected to the trolley frame (3) and is coaxial with the middle sleeve (1) and the small sleeve (12); the movable end and the operating end of the main pull rod (23) are respectively extended from the two ends of the trolley frame (3); the anti-slip tooth pull plate (231) is hinged on the movable end of the main pull rod (23); During installation, the anti-skid tooth pull plate (231) extends out of the first end of the small sleeve (12) and then retracts until the anti-skid tooth pull plate (231) abuts against the first end of the small sleeve (12); during disassembly, the hydraulic cylinder (21) pushes the support plate (11), the pusher frame (3) moves backward relative to the support plate (11), and drives the small sleeve (12) to come out of the middle sleeve (1).
2. The hydraulic disassembly device for small sleeves in blast furnace tuyere according to claim 1 is characterized in that: include: A welding plate (221) and a movable sliding hammer (22); the welding plate (221) is sleeved on the operating end of the main pull rod (23); the movable sliding hammer (22) is sleeved on the main pull rod (23) and is slidably arranged between the welding plate (221) and the trolley frame (3).
3. The hydraulic disassembly device for small sleeves in blast furnace tuyere according to claim 2 is characterized in that: include: Handle rod (222); the handle rod (222) is symmetrically arranged on both sides of the movable slide hammer (22).
4. The hydraulic disassembly device for small sleeves in blast furnace tuyere according to claim 1 is characterized in that: include: The plug-in plate connector (2) is provided on the movable end of the main pull rod (23); a through slot (212) is provided on the plug-in plate connector (2); and the anti-slip tooth pull plate (231) is hinged to the through slot (212).
5. The hydraulic disassembly device for small sleeves in blast furnace tuyere according to claim 1 is characterized in that: The cart frame (3) comprises: a frame body, a connecting frame (312), and wheels (31) arranged in pairs; the frame body and the connecting frame (312) are connected; both sides of the connecting frame (312) are hinged to the wheels (31) respectively; and a main pull rod (23) is installed on the frame body.
6. The hydraulic disassembly device for small sleeves in blast furnace tuyere according to claim 4 is characterized in that: The anti-slip tooth pull plate (231) comprises: an arc plate (232) and a blocking strip (235); the blocking strip (235) is provided on one side of the arc plate (232); the length of the blocking strip (235) is greater than the diameter of the first end of the small sleeve (12); when installed, the blocking strip (235) abuts against the first end of the small sleeve (12).
7. The hydraulic disassembly device for small sleeves in blast furnace tuyere according to claim 6 is characterized in that: The anti-slip tooth pull plate (231) comprises: a limiting rod (234); a limiting rod (234) is provided on one side of the arc plate (232); and the limiting rod (234) is in limiting contact with the plug-in plate connector (2).
8. The hydraulic disassembly device for small sleeves in blast furnace tuyere according to claim 6 is characterized in that: include: A hinge rod (211); a hinge hole (233) is provided at the center of the arc plate (232); the hinge rod (211) is passed through the hinge hole (233) and is mounted on the extended end of the plugboard connector (2).
9. The hydraulic disassembly device for small sleeves in blast furnace tuyere according to claim 5, characterized in that: include: A plurality of reinforcing plates (311); the main pull rod (23) and the frame are connected via the reinforcing plates (311).
10. A method for disassembling small sleeves in blast furnace tuyere, characterized in that: The following steps are involved: 1) After assembling the device according to any one of claims 1 to 9, the second end of the middle sleeve (1) is inserted into the through hole of the support plate (11), and the main pull rod (23) is pushed to insert the anti-slip tooth pull plate (231) outside the first end of the small sleeve (12); 2) Press down the operating end of the main pull rod (23), lift the movable end of the main pull rod (23), and retract the main pull rod (23) until the anti-slip tooth pull plate (231) abuts against the first end of the small sleeve (12). After multiple retractions to confirm reliable abutment, start the hydraulic cylinder (21) to push the support plate (11) and the trolley frame (3) away from each other until the small sleeve (12) is released from the middle sleeve (1).