Hydraulic disassembly device for small and medium sleeves in blast furnace tuyeres

Abstract

This application discloses a hydraulic disassembly device for small and medium sleeves in a blast furnace tuyeres, comprising: a support plate, a pair of hydraulic cylinders, a main tie rod, a pusher frame, and an anti-slip toothed pull plate; a through hole is provided in the central area of ​​the support plate, and the second end of the medium sleeve is inserted into the through hole; the hydraulic cylinders are symmetrically arranged on the end face of the pusher frame facing the support plate; the main tie rod is connected to the pusher frame and is coaxial with the medium and small sleeves; the movable end and the operating end of the main tie rod extend out from both ends of the pusher frame; the anti-slip toothed pull plate is hinged to the movable end of the main tie rod. This device is suitable for replacing small and medium sleeves in the narrow blast furnace tuyeres area, reducing labor, improving production efficiency, and lowering production costs.

Description

Technical Field

[0001] This application relates to the field of blast furnace production technology, and in particular to a hydraulic disassembly device for small sleeves in blast furnace tuyeres. Background Technology

[0002] In blast furnace ironmaking production, see Figure 1 The small and medium sleeves of the blast furnace tuyeres are coaxially nested and connected. The extension end of the medium sleeve covers the small sleeve, and the extension end of the small sleeve sends hot air into the blast furnace. The hot air temperature is generally as high as 1200℃. The medium and small sleeves are made of copper, and a water-cooling device is required to cool them during use to protect the components. After long-term use, the medium and small sleeves are prone to deformation, burning, or water leakage.

[0003] After the middle sleeve deforms, the orientation of the small sleeve cannot be accurately adjusted, making normal injection operation impossible and preventing normal open and uniform injection, which affects the injection direction of the gas flow in the furnace. Secondly, after the middle sleeve deforms, the water inlet pipe of the small sleeve is deformed by pressure, affecting the cooling water circulation supply of the small sleeve. When the furnace condition fluctuates, the cooling water inlet pipe of the small sleeve is subjected to uneven force, which leads to cracking or burning of the weld joint of the water inlet pipe and leakage. The blast furnace is forced to shut down and the small sleeve of the tuyeres needs to be replaced.

[0004] Currently, the blast furnace tuyere sleeve is installed between the tuyere platform and the tapping area platform. Moreover, the sleeve is not only close to the furnace shell, but the space in this area is also long and narrow, making it impossible for existing mechanical equipment to approach and operate. This brings a lot of inconvenience to the disassembly and installation work, and the operation is complicated.

[0005] The current procedure for disassembling the small sleeve is to manually use tools such as sledgehammers and steel chisels to drill into the furnace shell for disassembly and installation. However, blast furnaces are now trending towards larger sizes, and the dimensions of the tuyere small and medium sleeves are also increasing, with the largest weighing around 600 kilograms. The current method of disassembling and installing the small sleeve by hand is time-consuming and labor-intensive, requiring 6 to 8 people and 6 hours to complete each replacement. This method is labor-intensive, time-consuming, poses many safety hazards, and affects the progress of blast furnace maintenance.

[0006] When the air vent sleeve is severely deformed and difficult to disassemble, oxygen must be introduced to raise the temperature of the air vent sleeve and then adjust its deformed position so that it can be pulled out. However, this process easily generates smoke and dust, polluting the environment. If the oxygen burns the air vent sleeve, it can also burn the air vent sleeve if the operation is not careful. At the same time, there is a 60% chance that the air vent sleeve will break. Damaged air vent sleeves cannot be reused, prolonging maintenance time and delaying air supply.

[0007] Each replacement of small and medium-sized blast furnace sleeves requires a lengthy shutdown for maintenance. Restarting the furnace after a shutdown necessitates the addition of large quantities of coke for blast furnace recovery. In a normal production plant, with up to 20 small and medium-sized blast furnace sleeves, losses due to shutdowns for maintenance can reach over 5 million yuan. This increases production costs, and the current market price for small and medium-sized blast furnace sleeves is high. Existing methods for removing medium-sized sleeves result in a 60% damage rate, and damaged sleeves cannot be reused, further increasing production costs.

[0008] The inability to resolve these issues is impacting blast furnace production and operations.

[0009] The information disclosed in the background section is intended only to enhance the understanding of the general background of the utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0010] This application addresses the aforementioned technical problems by providing a hydraulic disassembly device for the small and medium sleeves of blast furnace tuyeres. This device is suitable for disassembling and assembling the small and medium sleeves of blast furnace smelting tuyeres in confined environments. It can improve 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 convenient maintenance.

[0011] This application provides a hydraulic disassembly device for the small sleeve of a blast furnace tuyer, which includes a small sleeve and a medium sleeve; the first end diameter of the small sleeve is smaller than the second end diameter; the first end diameter of the medium sleeve is smaller than the second end diameter; the second end of the small sleeve is inserted into the first end of the medium sleeve; and includes a support plate, a pair of hydraulic cylinders, a main tie rod, a pusher frame, and an anti-slip toothed pull plate. A through hole is provided in the central area of ​​the support plate, and the second end of the middle sleeve is inserted into the through hole; hydraulic cylinders are symmetrically arranged on the end face of the trolley frame facing the support plate; The main pull rod is connected to the trolley frame and is coaxial with the middle and small sleeves; the movable end and operating end of the main pull rod extend out of both ends of the trolley frame respectively; the anti-slip toothed pull plate is hinged to the movable end of the main pull rod.

[0012] Preferably, it includes: a solder pad and a movable slide weight; the solder pad is sleeved on the operating end of the main pull rod; the movable slide weight is sleeved on the main pull rod and slidably disposed between the solder pad and the trolley frame.

[0013] Preferably, it includes: a handle; the handle is symmetrically arranged on both sides of the movable slide.

[0014] Preferably, it includes: a plug plate connector; the plug plate connector is disposed on the movable end of the main pull rod; a through groove is formed on the plug plate connector; and an anti-slip toothed pull plate is hinged to the through groove.

[0015] Preferably, the trolley frame includes: a frame body, a connecting frame, and a pair of wheels; the frame body and the connecting frame are connected; the two sides of the connecting frame are respectively hinged to the wheels; and the main pull rod is installed on the frame body.

[0016] Preferably, the anti-slip toothed pull plate includes: an arc plate and a stop strip; the stop strip is provided on one side of the arc plate; the length of the stop strip is greater than the diameter of the first end of the small sleeve; during installation, the stop strip abuts against the first end of the small sleeve.

[0017] Preferably, the anti-slip toothed pull plate includes: a limiting rod; a limiting rod is provided on one side of the arc plate; the limiting rod makes limiting contact with the insert plate connector.

[0018] Preferably, it includes: a hinge rod; a hinge hole is opened at the center of the arc plate; the hinge rod passes through the hinge hole and is installed on the extension end of the insert plate connector.

[0019] Preferably, it includes: multiple reinforcing plates; the main tie rod is connected to the frame through the reinforcing plates.

[0020] The beneficial effects that this application can produce include: 1) The hydraulic dismantling device for small and medium sleeves in the blast furnace tuyeres provided in this application is suitable for replacing small and medium sleeves in the narrow blast furnace tuyeres area, which can reduce labor, improve production efficiency and reduce production costs.

[0021] 2) The hydraulic disassembly device for small and medium-sized tuyere sleeves provided in this application allows for the complete and undamaged removal of these sleeves. The removed sleeves are free from edge damage, increasing the reuse rate of small and medium-sized sleeves to 95% and reducing the breakage rate of medium-sized sleeves from 60% to 5%, effectively lowering production costs. Assuming a one-year service life for small and medium-sized sleeves, and each blast furnace currently has 24 tuyere sleeves (medium and small), 7-8 sleeves need to be calibrated annually, excluding cases of burnout or leakage. Based on a single medium-sized sleeve price of 100,000 yuan and a single small sleeve price of 50,000 yuan, replacing and calibrating a single tuyere medium sleeve using this device can save over 800,000 yuan compared to existing methods for restoring coke to the blast furnace. Replacing and calibrating a single tuyere small sleeve using this device can save over 400,000 yuan compared to existing methods for restoring coke to the blast furnace.

[0022] 3) The hydraulic dismantling device for the small and medium sleeves of the blast furnace tuyeres provided in this application can save 400,000 to 800,000 yuan of coke per unit by replacing the medium sleeve, which takes about 2 hours and 40 minutes respectively.

[0023] 4) The hydraulic dismantling device for small and medium-sized tuyeres provided in this application can replace the existing manual prying and pushing operations, freeing workers from high-risk and high-intensity work. It enables rapid replacement of modular pullers, adapting to small and medium-sized tuyeres of different blast furnace models without requiring customization for a single piece of equipment, thus exhibiting strong versatility. Operators can remotely control the device, reducing the time personnel are exposed to high temperatures and gas environments, thereby mitigating safety risks from the outset. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the main sectional view of an existing blast furnace tuyeres; Figure 2 A perspective view of the hydraulic disassembly device for the small sleeve in the blast furnace tuyeres in at least one embodiment provided in this application; Figure 3A perspective view of the anti-slip toothed pull plate in at least one embodiment provided in this application; Figure 4 A schematic diagram of the installation state of the anti-slip toothed pull plate on one end of the main pull rod in at least one embodiment provided in this application; Figure 5 A schematic diagram of the installation state of the anti-slip toothed pull plate in the small sleeve in at least one embodiment provided in this application; Figure 6 A schematic diagram of the hydraulic disassembly device for the small sleeve in the blast furnace tuyeres in at least one embodiment provided in this application; a is the assembled state; b is the disassembled state; Legend: Main tie rod 23, movable slide weight 22, hydraulic cylinder 21, insert plate connector 2, small sleeve 12, support plate 11, middle sleeve 1, support frame 113, welding pad 221, handle bar 222, anti-slip toothed pull plate 231, wheel 31, trolley frame 3, reinforcing plate 311, connecting frame 312, support retaining ring 115, arc plate 232, hinge hole 233, limit rod 234, stop strip 235, through groove 212, hinge rod 211. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the utility model clearer, the technical solutions of the embodiments of the utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. The components of the embodiments of the utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the utility model without inventive effort are within the scope of protection of the utility model.

[0027] Technical means not detailed in this application and not used to solve the technical problems of this application are all set according to common general knowledge in the field, and multiple common general knowledge setting methods can be implemented.

[0028] See Figures 1-6The hydraulic disassembly device for the small sleeve of the blast furnace tuyeres provided in this application includes: a main pull rod 23, a movable sliding hammer 22 for applying force, a hydraulic cylinder 21, a plate connector 2, a small sleeve 12, a support plate 11, a middle sleeve 1, a support frame 113, a welding pad 221, a handle 222, an anti-slip toothed pull plate 231, a wheel 31, a pushcart frame 3, a reinforcing plate 311, a connecting frame 312, and a support retaining ring 115; A through hole is provided at the center of the support plate 11, and the middle sleeve 1 is fitted into the through hole. A trolley frame 3 is provided on the outside of the larger diameter end of the middle sleeve 1. Wheels 31 are symmetrically provided at the bottom of the trolley frame 3 for easy movement. The main tie rod 23 is installed in the center area of ​​the trolley frame 3, directly opposite the through hole. The main tie rod 23 coincides with the central axis of the through hole. Both ends of the main tie rod 23 extend out of the trolley frame 3. A plate connector 2 is provided on the movable end of the main tie rod 23, and an anti-slip toothed pull plate 231 is hinged on the plate connector 2. A plate connector 2 is provided on the movable end of the main tie rod 23. A through groove 212 is provided on the plate connector 2. A hinge rod 211 is installed on one end of the through groove 212. An anti-slip toothed pull plate 231 is hinged to the hinge rod 211. The anti-slip toothed pull plate 231 can rotate around the hinge rod 211 within the through groove 212. A limiting rod 234 is provided on the anti-slip toothed pull plate 231. The limiting rod 234 makes limiting contact with the plate connector 2. When the anti-slip toothed pull plate 231 rotates around the hinge rod 211, the rotation angle of the anti-slip toothed pull plate 231 can be limited by the limiting rod 234.

[0029] The anti-slip toothed pull plate 231 includes: an arc plate 232, a hinge hole 233, a limiting rod 234, and a stop strip 235; a stop strip 235 is provided on one side of the arc plate 232; the length of the stop strip 235 is greater than the distal diameter of the small sleeve 12, and it abuts against the small sleeve 12 when it is disassembled. A hinge hole 233 is provided in the central area of ​​the arc plate 232 for hinged connection with the hinge rod 211; a limiting rod 234 is provided on one side of the arc plate 232 near the stop strip 235 to limit the rotation angle of the arc plate 232.

[0030] Hydraulic cylinders 21 are symmetrically arranged on the end face of the trolley 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.

[0031] During installation, the diameter of the first end of the small sleeve 12 is smaller than that of 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 that of 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 fitted into the first end of the middle sleeve 1, and the anti-slip toothed pull plate 231 is hinged in the through groove 212. The anti-slip toothed pull plate 231 is at a 45° angle with the main pull rod 23, and the stop strip 235 is set towards 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 elaborated here. The tightness is based on the fact that the anti-slip toothed pull plate 231 and the main pull rod 23 can rotate after contacting the obstacle. At this point, operate the operating end of the main pull rod 23 to insert the anti-slip toothed pull plate 231 into the small sleeve 12. Then, the operator presses down on the operating end of the main pull rod 23, thereby raising the movable end of the main pull rod 23 inserted into the small sleeve 12, so that one end of the stop strip 235 abuts against the opening of the small sleeve 12. Then, operate the operating end of the main pull rod 23 again, so that the main pull rod 23 is parallel to the ground, and then pull back the main pull rod 23 to drive the anti-slip toothed pull plate 231 to retract, moving it until both ends of the stop strip 235 abut against the small sleeve 12. This process can be repeated multiple times to achieve reliable abutment for installation to be complete. After dragging the main pull rod 23 several times to confirm that the anti-slip toothed pull plate 231 and the small sleeve 12 have reliably abutted, proceed with the disassembly operation. If the anti-slip toothed pull plate 231 comes off at this time, the installation operation is repeated. The movable end of the main pull rod 23 extends out of the first end of the small sleeve 12 and then retracts to engage with the first end of the anti-slip toothed pull plate 231.

[0032] During disassembly, after installation, the operator activates the hydraulic cylinders 21 symmetrically positioned on both sides of the trolley frame 3 to apply force evenly. The hydraulic cylinders 21 push the support plate 11, causing the trolley frame 3 to move backward relative to the support plate 11, pulling the small sleeve 12 out from the middle sleeve 1. This process requires no manual pulling; the small sleeve 12 is pulled out by the hydraulic cylinders 21, saving time and effort with high efficiency.

[0033] In one specific embodiment, it includes: a movable slide weight 22; the movable slide weight 22 is slidably sleeved on the main pull rod 23 and abuts against the solder pad 221 on the main pull rod 23; the movable slide weight 22 is slidably set on the main pull rod 23 on the outside of the trolley frame 3; handles 222 are symmetrically arranged on the opposite side wall of the movable slide weight 22. When it is necessary to determine whether it is installed in place, the operator can hold the handles 222 and pull the movable slide weight 22 to facilitate the application of force. At the same time, when the anti-slip toothed pull plate 231 enters the outer area of ​​the small sleeve 12 and encounters impurities that block the pull back movement, the operator can pull the main pull rod 23 so that the anti-slip toothed pull plate 231 cleans the impurities on the inner wall and ensures the reliable abutment between the anti-slip toothed pull plate 231 and the small sleeve 12.

[0034] In one specific embodiment, the trolley 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 disposed on the top surface of the connecting frame 312; the connecting frame 312 is hinged to the wheels 31; the central area of ​​the frame body is provided with a through hole on the support plate 11; the main tie rod 23 passes through the frame body. This enables the frame body to rotate relative to the wheels 31.

[0035] In one specific embodiment, it includes: multiple reinforcing plates 311; the main tie rod 23 is connected to the frame through multiple reinforcing plates 311; this helps to improve the stress reliability of the main tie rod 23 and increase the contact area between the main tie rod 23 and the frame.

[0036] In one specific embodiment, hydraulic cylinders 21 are symmetrically arranged on the frame.

[0037] In one specific embodiment, a support retaining ring 115 is disposed 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. This is used to increase the force-bearing area between the support plate 11 and the middle sleeve 1, and improve the operational stability when pulling out the small sleeve 12.

[0038] In one specific embodiment, it includes: a pair of support frames 113; 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 so as to ensure that the main pull rod 23 installed on the trolley frame 3 and the central through hole of the support plate 11 share the same central axis. By setting the support frames 113, the force reliability of the support plate 11 during operation can be improved.

[0039] In one specific embodiment, a support retaining ring 115 is provided on the first side wall of the support plate 11 to improve the support force of the support plate 11 on the centering sleeve 1 and improve the operational stability.

[0040] In one 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 will not be elaborated here. The design should be such that it can drive the small sleeve 12 to disengage from the middle sleeve 1.

[0041] The device is already in operation at Xianfu Steel. During its use, the casing breakage rate has decreased from 60% to 5%, and the reuse rate has increased to 95%. A single blast furnace (24 tuyeres) saves approximately 500,000 yuan annually in intermediate casing costs and approximately 350,000 yuan annually in minor casing costs; it significantly reduces downtime and coke consumption (estimated annual savings of 30.36 million yuan); and significantly reduces the risk of production stoppage losses. The replacement time for intermediate casings has been reduced from 6 hours to approximately 2 hours, and for minor casings to approximately 40 minutes.

[0042] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the utility model should be included within the protection scope of the utility model.

Claims

1. A hydraulic disassembly device for the small sleeve of a blast furnace tuyeres, the small sleeve comprising: Small sleeve (12), medium sleeve (1); the diameter of the first end of the small sleeve (12) is smaller than that of the second end; the diameter of the first end of the medium sleeve (1) is smaller than that of the second end; the second end of the small sleeve (12) is inserted into the first end of the medium sleeve (1); Its features are, Includes: support plate (11), paired hydraulic cylinders (21), main tie rod (23), trolley frame (3), and anti-slip toothed 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; hydraulic cylinders (21) are symmetrically arranged on the end face 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 set at both ends of the trolley frame (3); the anti-slip toothed pull plate (231) is hinged to the movable end of the main pull rod (23).

2. The hydraulic disassembly device for the small sleeve in the blast furnace tuyeres according to claim 1, characterized in that, include: The solder pad (221) and the movable slide (22) are fitted on the operating end of the main pull rod (23). The movable slide (22) is fitted on the main pull rod (23) and is slidably positioned between the solder pad (221) and the trolley frame (3).

3. The hydraulic disassembly device for the small sleeve in the blast furnace tuyeres according to claim 2, characterized in that, include: Handle lever (222); the handle lever (222) is symmetrically arranged on both sides of the movable slide (22).

4. The hydraulic disassembly device for the small sleeve in the blast furnace tuyeres according to claim 1, characterized in that, include: Insert plate connector (2); Insert plate connector (2) is set on the movable end of the main pull rod (23); Through groove (212) is opened on the insert plate connector (2); Anti-slip toothed pull plate (231) is hinged to through groove (212).

5. The hydraulic disassembly device for the small sleeve in the blast furnace tuyeres according to claim 1, characterized in that, The trolley frame (3) includes: a frame, a connecting frame (312), and a pair of wheels (31); the frame and the connecting frame (312) are connected; the two sides of the connecting frame (312) are hinged to the wheels (31); the main pull rod (23) is installed on the frame.

6. The hydraulic disassembly device for the small sleeve in the blast furnace tuyeres according to claim 4, characterized in that, The anti-slip toothed pull plate (231) includes: an arc plate (232) and a stop strip (235); the stop strip (235) is provided on one side of the arc plate (232); the length of the stop strip (235) is greater than the diameter of the first end of the small sleeve (12); during installation, the stop strip (235) abuts against the first end of the small sleeve (12).

7. The hydraulic disassembly device for the small sleeve in the blast furnace tuyeres according to claim 6, characterized in that, The anti-slip toothed pull plate (231) includes: a limiting rod (234); a limiting rod (234) is provided on one side of the arc plate (232); the limiting rod (234) is in limiting contact with the insert plate connector (2).

8. The hydraulic disassembly device for the small sleeve in the blast furnace tuyeres according to claim 6, characterized in that, include: Hinged rod (211); a hinge hole (233) is opened at the center of the arc plate (232); the hinged rod (211) passes through the hinge hole (233) and is installed on the extension end of the insert connector (2).

9. The hydraulic disassembly device for the small sleeve in the blast furnace tuyeres according to claim 5, characterized in that, include: Multiple reinforcing plates (311); the main tie rod (23) is connected to the frame through the reinforcing plates (311).

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