A converter sublance on-site vertical quick maintenance device and method

Abstract

The application discloses a converter sublance on-site vertical quick maintenance device, which comprises an upper platform and a lower platform, the upper platform is provided with an inspection unit, the lower platform comprises a slag removal platform, a middle layer platform and a bottom layer platform, and the slag removal platform, the middle layer platform and the bottom layer platform are sequentially arranged from top to bottom, the converter sublance on-site vertical quick maintenance device is adopted, on-site quick maintenance of the sublance is realized, the hoisting link is reduced, and the maintenance safety and efficiency are improved. The application further discloses a converter sublance on-site vertical quick maintenance method.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment maintenance technology. Specifically, this invention relates to a rapid on-site vertical maintenance device for converter auxiliary lances. Background Technology

[0002] The secondary lance is an important piece of equipment for the automated control of converter smelting. It has functions such as temperature measurement, carbon determination, oxygen determination, and liquid level measurement, and can realize real-time monitoring without tilting the furnace.

[0003] Because the secondary gun operates in high-temperature areas for extended periods, it suffers from problems such as steel sticking to the gun body, nozzle burnout, heat-induced aging of the sealing ring, and bending of the gun body, thus requiring repair.

[0004] Because the space in the upper frame of the converter is small, the traditional maintenance method is to hoist the sub-lance from 51 meters to the ground and then use a rail-guided flatbed trolley to shuttle it 120 meters through two LF furnaces and one RH furnace to the maintenance room for flat-lying repair. This method is time-consuming, unsafe, and labor-intensive for workers, and affects the continuity of production of the LF and RH furnaces.

[0005] In summary, the existing technology has the following problems: First, slag adhering to the secondary gun body during hoisting is prone to falling off and injuring people or damaging equipment; Second, because the secondary gun is 24,000 mm long and only 114 mm in diameter, it is very easy for the secondary gun to bend during hoisting, posing a safety risk during high-altitude hoisting; Third, the total maintenance time is more than 24 hours, requiring workers to work continuously and resulting in high labor intensity; Fourth, the gun transport trolley passes through the LF and RH furnaces, directly affecting the production of the LF and RH furnaces.

[0006] For example, invention patent CN114509020A, published on May 17, 2022, discloses a system for detecting the bending degree of a steelmaking converter lance. This system includes: a lance probe and a measuring position limiter; a signal acquisition device for acquiring image information from the lance probe; a signal processing device for receiving the image information, analyzing it to obtain an image display interface, and then outputting the analysis results; and a signal control device for automatically controlling whether the lance at the measuring position should continue lowering based on the analysis results. This detection system also fails to solve the aforementioned technical problem. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a converter sublance vertical rapid on-site repair device that enables rapid on-site repair of sublances, reduces hoisting procedures, and improves repair safety and efficiency.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The converter auxiliary lance on-site vertical rapid maintenance device includes an upper platform and a lower platform. The upper platform is equipped with an inspection unit, and the lower platform includes a slag cleaning platform, a middle platform, and a bottom platform, which are arranged sequentially from top to bottom.

[0009] The upper platform is provided with a first opening slot and a second opening slot arranged side by side. The end and opening of the first opening slot are respectively provided with a storage position and a slag cleaning position. The end and opening of the second opening slot are respectively provided with a calibration center position and a calibration straightness position. The middle platform is provided with a calibration straightness manhole and a slag cleaning manhole. The slag cleaning manhole is located below the first opening slot, and the calibration straightness manhole is located below the second opening slot. The bottom platform is provided with a scrap steel hopper located below the slag cleaning manhole.

[0010] The detection unit includes a cooling water station located at one end of the upper platform. The cooling water station is integrated with a compressed air pipe. The upper platform is also provided with a component mounting surface.

[0011] The bottom platform is equipped with a scrap steel channel at one end, and a water pipe is connected to the bottom of the bottom platform. A drain valve is installed on the water pipe.

[0012] The slag removal platform, the middle platform, and the bottom platform are connected by stairs, and the slag removal platform is equipped with guardrails.

[0013] The method for on-site vertical rapid repair of converter sub-lances, implemented using the aforementioned on-site vertical rapid repair device for converter sub-lances, is characterized by comprising the following steps: Step 1: Hoist the secondary gun to the storage position, drain the remaining water, and discharge it through the water pipe after opening the drain valve; Step 2: Open the manhole cover for cleaning slag and check if the scrap steel hopper is located below the secondary gun body; Step 3: Hoist the secondary gun to the slag removal position, clean the residual steel and slag of the secondary gun on the slag removal platform and the middle platform, receive the scrap steel hopper and transport the residual steel and slag to the scrap steel channel; Step 4: Hoist the secondary gun from the slag removal position to the calibration center position; Step 5: Inspect the sub-gun connector connection on the middle platform, address any stripped external threads, and check the probe signal cable plug and fastening the connector. Step 6: Cut and grind the weld between the burnt nozzle and the outer tube, replace and weld a new nozzle; Step 7: Hoist the auxiliary gun from the calibration center position to the straightness calibration position and check the straightness; Step 8: Connect the inlet and outlet water pipe flanges of the auxiliary gun to the cooling water station and check for leaks; Step 9: Connect the secondary gun cooling air supply pipe and check for leaks; Step 10: Record the processing procedure and inspection data, and hoist the repaired auxiliary gun back to the standby position.

[0014] In step 3, an electric hoist is used to raise and lower the auxiliary gun at a speed of 2 m / min.

[0015] In step 8, the cooling water is pressurized to 0.5 MPa and held for 5 minutes; after confirming there is no leakage, it is pressurized to 1.5 times the working pressure and held for 30 minutes; if leakage occurs, it is marked and repaired to normal.

[0016] In step 9, the compressed air test pressure is 1.5 times the working pressure, and the pressure is maintained for 5 minutes. If leakage occurs, check and reprocess until normal.

[0017] The straightness verification includes preliminary verification and precise verification. The preliminary verification includes fixing a plumb bob to the top of the sub-gun, lowering it, and measuring the horizontal deviation of the upper and lower sections of the gun body from the plumb line. The horizontal deviation is required to be ≤ ± 3mm; The precise verification includes: using a laser emitter to emit a vertical line, and using a laser receiver to detect the offset of each section of the gun body, requiring the offset to be ≤1mm.

[0018] The technical effects of this invention are as follows: 1. Pioneering online vertical maintenance mode for converter sub-lances: Integrating maintenance space into vertical maintenance between the high-span platforms of the converter, breaking through the limitations of traditional offline horizontal maintenance; forming a complete online vertical rapid maintenance system for converter sub-lances, realizing rapid, efficient and safe on-site maintenance of sub-lances.

[0019] 2. Multifunctional integrated design: Enables multiple maintenance operations for the secondary gun, improving maintenance efficiency; 3. Coordinated optimization of safety and efficiency, and safety and environment: The auxiliary gun is lifted by an electric hoist and moved up and down in the maintenance platform with the movable cover opened. The maintenance platform is designed with a slag and scrap steel hopper. The slag is sent from the lifting hole to the scrap steel room on the ground for reuse, which reduces costs, increases steelmaking efficiency, reduces safety risks in maintenance operations, and improves the environment. Attached Figure Description

[0020] This manual includes the following figures, which illustrate the following: Figure 1 This is a schematic diagram of the on-site vertical rapid repair device for converter auxiliary lances of the present invention; Figure 2 This is a top view of the central area of ​​the platform of the present invention.

[0021] The diagram is marked as follows: 1. Upper platform; 11. First opening slot; 111. Storage position; 112. Slag removal position; 12. Second opening slot; 121. Verification center position; 122. Verification straightness position; 13. Component mounting plane; 14. Cooling water station; 2. Lower platform; 3. Slag removal platform; 31. Guardrail; 32. Stairs; 4. Middle platform; 41. Manhole for verifying straightness; 42. Manhole for slag removal; 5. Bottom platform; 51. Scrap steel hopper; 52. Scrap steel channel; 53. Water inlet pipe; 54. Drain valve. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0023] like Figure 1 As shown, the converter auxiliary lance on-site vertical rapid maintenance device includes an upper platform 1 and a lower platform 2. The upper platform 1 is equipped with an inspection unit, and the lower platform 2 includes a slag cleaning platform 3, a middle platform 4, and a bottom platform 5, which are arranged sequentially from top to bottom.

[0024] The vertically layered design of the upper platform 1 and lower platform 2 fully utilizes the longitudinal space of the converter's upper frame, integrating multiple functions such as storage, drainage, slag removal, calibration, and maintenance of the auxiliary lance into different height levels. This achieves a vertical maintenance mode where the auxiliary lance is not touched to the ground or transported horizontally on-site. Compared to the traditional method of hoisting the auxiliary lance to the ground and then laying it flat for maintenance, the vertical layout of this device keeps the auxiliary lance in an upright position at all times, avoiding the risk of bending during hoisting and eliminating the safety hazard of slag adhering to the lance falling from a height and injuring people.

[0025] like Figure 1 and Figure 2 As shown, the upper platform 1 has a first opening slot 11 and a second opening slot 12 arranged side by side. The end and opening of the first opening slot 11 are respectively provided with a storage position 111 and a slag cleaning position 112. The end and opening of the second opening slot 12 are respectively provided with a verification center position 121 and a verification straightness position 122. The middle platform 4 is provided with a verification straightness manhole 41 and a slag cleaning manhole 42. The slag cleaning manhole 42 is located below the first opening slot 11, and the verification straightness manhole 41 is located below the second opening slot 12. The bottom platform 5 is provided with a scrap steel hopper 51 located below the slag cleaning manhole 42.

[0026] The first opening slot 11 is used for storage and slag removal processes: the storage position 111 at the end is the initial hoisting position of the auxiliary gun, which is used for drainage and temporary storage of the auxiliary gun; moving along the opening slot towards the opening, the auxiliary gun reaches the slag removal position 112. At this time, the lower end of the auxiliary gun passes through the slag removal manhole 42 and is located below the slag removal platform 3, where maintenance personnel can clean the lower end of the auxiliary gun on the slag removal platform 3. The second opening slot 12 is used for calibration processes: the calibration center position 121 at the end is used for calibrating the center distance between the auxiliary gun's inlet and outlet water pipes and for thread processing; the calibration straightness position 122 at the opening is used for calibrating the straightness of the auxiliary gun. This design of moving the auxiliary gun position through the opening slots allows the auxiliary gun to be easily moved from one workstation to another in a vertical state without repeated hoisting and repositioning. The slag removal manhole 42 is located below the first opening slot 11, allowing the residue at the lower end of the auxiliary gun to fall directly into the scrap steel hopper 51 below the slag removal manhole 42 during slag removal, preventing residue from splashing everywhere and contaminating the platform. The manhole 41 for straightness verification is located below the second opening slot 12, providing personnel operating space and measurement channel for straightness verification. The scrap steel hopper 51 is set on the bottom platform 5, directly below the slag cleaning manhole 42, ensuring that the waste generated during slag cleaning can be effectively collected and easily transported back to the furnace.

[0027] When the auxiliary gun is located at the slag removal position 112 of the first opening slot 11, it is directly below the slag removal manhole 42 and the scrap steel hopper 51. This vertical correspondence simultaneously achieves the positioning and alignment process without additional adjustment. The same applies when the auxiliary gun is located in the second opening slot 12. The above arrangement maximizes the space utilization of maintenance operations and avoids the risk of interference and collision when the auxiliary gun moves between different work positions.

[0028] like Figure 1 As shown, the testing unit includes a cooling water station 14, which is located at one end of the upper platform 1. The cooling water station 14 integrates a compressed air pipe, and the upper platform 1 also has a component mounting surface 13. When the auxiliary gun is in the calibration center position 121, its inlet and outlet water pipe flanges are aligned with the water supply pipes of the cooling water station 14, facilitating quick connection. The component mounting surface 13 serves as the mounting location for the compressed air / cooling water pipes and valve pressure pump, and its position is close to the calibration center position 121, facilitating the work process of maintenance personnel.

[0029] A scrap steel channel 52 is located at one end of the bottom platform 5, and a water inlet pipe 53 is connected to the bottom of the bottom platform 5. A drain valve 54 is installed on the water inlet pipe 53. Waste generated during slag removal falls into the scrap steel hopper 51, which is then transported out through the scrap steel channel 52. Residual water discharged from the secondary lance is drained away through the water inlet pipe 53. The two separate processes handle solid waste and liquid waste, avoiding secondary pollution caused by mixed processing. Both the scrap steel hopper 51 and the water inlet pipe 53 are located on the lower bottom platform 5, away from the working areas of the upper platform 1 and the middle platform 4, keeping the main working surface for maintenance personnel clean.

[0030] The cleaning platform 3, the middle platform 4, and the bottom platform 5 are connected by a staircase 32. The cleaning platform 3 is equipped with a guardrail 31. The staircase 32 connects the three platforms into a complete working passage. Maintenance personnel can access the cleaning platform 3 from the upper platform 1 via the staircase 32, then descend to the middle platform 4, and finally to the bottom platform 5, without the need for vertical personnel transport using lifting equipment. The guardrail 31 is installed at the edge of each platform, forming continuous safety protection, allowing maintenance personnel to safely approach and operate the auxiliary gun even when working at height.

[0031] The method for on-site vertical rapid maintenance of converter sub-lances, implemented using the aforementioned on-site vertical rapid maintenance device for converter sub-lances, is characterized by the following steps: Step 1: Hoist the sub-lance to storage position 111, drain excess water, and discharge it through the water inlet pipe 53 after opening the drain valve 54; Step 2: Open the cover of the slag cleaning manhole 42 and check whether the scrap steel hopper 51 is located below the sub-lance body; Step 3: Hoist the sub-lance to slag cleaning position 112, clean the residual steel and slag on the slag cleaning platform 3 and the middle platform 4, and receive the material in the scrap steel hopper 51 and transport the residual steel and slag to the scrap steel channel 52; Step 4: Hoist the sub-lance from slag cleaning position 112 to the calibration center. Step 5: Inspect the sub-gun connector connection on the middle platform 4, address any stripped external threads, and check the probe signal line plug and fastening pin connector; Step 6: Cut and grind the weld between the burnt nozzle and the outer tube, replace and weld a new nozzle; Step 7: Hoist the sub-gun from calibration center position 121 to calibration straightness position 122, and verify straightness; Step 8: Connect the sub-gun inlet and outlet water pipe flanges to the cooling water station 14 and check for leaks; Step 9: Connect the sub-gun cooling air source pipe and check for leaks; Step 10: Record the processing and inspection data, and hoist the repaired sub-gun back to the standby position.

[0032] In the above steps, steps 1 and 2 utilize the storage position 111 and the cover plate of the slag removal manhole 42 on the upper platform 1; step 3 utilizes the slag removal position 112, the slag removal manhole 42, and the scrap steel hopper 51; step 4 utilizes the movement function of the first opening slot 11 on the limiting base plate; steps 5 and 6 utilize the working space of the middle platform 4; step 7 utilizes the second opening slot 12 and the straightness verification position 122; steps 8 and 9 utilize the cooling water station 14 and the compressed air pipe on the upper platform 1. Each method step has corresponding structural features as support, and the structure and process are highly matched, enabling maintenance operations to be performed efficiently and safely.

[0033] Vertical maintenance of the auxiliary lance consists of the aforementioned operational steps, which are performed sequentially according to the workstation layout of the auxiliary lance, with each step providing the necessary conditions for the next step. Compared with the traditional horizontal transfer maintenance method, this method keeps the auxiliary lance in a vertical position at all times, and all operations are completed on-site within the upper frame of the converter, eliminating the need for a 120-meter transfer and having no impact on the LF and RH furnace areas, thus ensuring continuous steelmaking production.

[0034] In step 3, an electric hoist is used to raise and lower the auxiliary gun at a speed of 2 m / min. Because the auxiliary gun is long and short in diameter, it is prone to swaying during vertical raising and lowering. Controlling the raising and lowering speed at 2 m / min ensures the continuity of the cleaning operation and effectively suppresses the swaying of the auxiliary gun, preventing it from colliding with the platform or manhole edge. While the auxiliary gun descends at 2 m / min, maintenance personnel can simultaneously clean the area. The cleaned residue falls directly into the scrap steel hopper 51 below, achieving simultaneous cleaning and collection.

[0035] In step 8, the cooling water is pressurized to 0.5 MPa and held for 5 minutes. After confirming no leakage, the pressure is increased to 1.5 times the working pressure and held for 30 minutes. If leakage occurs, it is marked and repaired to normal. The hydrostatic test has two stages: low-pressure pre-inspection and high-pressure final inspection. The 0.5 MPa low-pressure leak test is used to initially check for obvious leaks at the flange connections and welds of the auxiliary nozzle's inlet and outlet water pipes. At this pressure, the pressure is low, and even if a leak occurs, there is no risk of injury from high-pressure water jets. Holding the pressure for 5 minutes is sufficient to detect leaks at most sealing surfaces. After confirming no low-pressure leaks, the pressure is increased to 1.5 times the working pressure and held for 30 minutes. 1.5 times the working pressure is a commonly used safety factor for pressure testing of pressure vessels and pipelines. It can expose potential strength and sealing defects, will not cause plastic deformation of the auxiliary nozzle, and allows observation of the stability of the pressure gauge and inspection of all welds and joints for leakage.

[0036] In step 9, the compressed air test pressure is 1.5 times the working pressure, and the pressure is maintained for 5 minutes. If a leak occurs, check and restore normal operation. The cooling air supply pipe of the secondary gun is used for gas protection or purging during secondary gun operation, and its sealing is equally important. The compressed air test uses 1.5 times the working pressure, and the pressure is maintained for 5 minutes, which is sufficient to detect leaks.

[0037] Straightness verification includes preliminary verification and precise verification. Preliminary verification includes fixing a plumb bob to the top of the secondary rifle, lowering it, and measuring the horizontal deviation of the upper and lower sections of the rifle body from the plumb line. The horizontal deviation should be ≤ ± 3mm; Precise calibration includes: using a laser emitter to emit a vertical line, and using a laser receiver to detect the offset of each section of the gun body, requiring the offset to be ≤1mm.

[0038] Preliminary verification employs the traditional plumb bob method, which is simple, quick, and inexpensive. It can be performed every time a secondary gun is taken off the production line for maintenance, quickly determining if there is significant bending deformation. The plumb bob hangs naturally from the top of the secondary gun, and its vertical line is the absolute plumb line. Measuring the horizontal deviation of the upper and lower sections of the gun body from this plumb line visually reflects the overall degree of bending. A tolerance of ±3mm is used to screen secondary guns requiring correction. Precise verification uses a laser emitter and receiver. The vertical line accuracy emitted by the laser emitter is far superior to that of the plumb bob, and the laser receiver can measure point by point along the length of the secondary gun, obtaining continuous offset data for each cross-section of the gun body, enabling the detection of localized bending and minor deformation. A more stringent requirement of ≤1mm offset is used for final confirmation of the secondary gun after preliminary verification and correction, ensuring that it meets usage requirements.

[0039] Example 1: Determining the location of the secondary gun for vertical maintenance and preparing the upper and lower maintenance platforms 2.

[0040] 1. Determine that the two platforms in the LK column of the converter high span, lines 10-11, will be the on-site vertical maintenance area for the auxiliary lances; Second: On the upper platform 1, there are four workstations on the left and right. The storage position 111 is used for storing the sub-gun and draining the cooling water inside the sub-gun. The slag removal position 112 is used for slag removal and other functions. The calibration center position 121 is used to calibrate the relative position of the center distance of the sub-gun cooling water pipe and to handle the threads of the inlet and outlet water pipes and nitrogen pipes. The straightness calibration position 122 is used to calibrate the straightness of the sub-gun body and other functions. Three: On the upper platform, verify the relative position of the center dimensions of the sub-gun's inlet and outlet water pipes, the alignment of the connecting flanges, etc. 4. Reserve compressed air and cooling water pipe joints, valves, and pressure pumps near the upper platform 1; 5. Ladders and safety railings are installed on the lower platform 2, with three levels: upper, middle, and lower. The upper level is a slag removal platform, the middle level is a platform for changing nozzles, and the lower level stores water collection tanks and scrap steel hoppers 51 on the east and west sides; clear warning and isolation zones are set up.

[0041] Step Six: A movable cover is installed on the lower platform 2, which is closed when not in use to facilitate the hoisting of faulty auxiliary nozzles, drainage, slag removal, and maintenance; the middle layer of the lower platform 2 is a maintenance work station. It can be used to replace auxiliary nozzle heads and plug connectors, as well as to check the straightness of the nozzle body; a water tank and water pipe 53 are laid near the lower layer of the platform, and connected to the drainage channel of the demineralized water tank at an elevation of 19.57 meters.

[0042] Example 2: Vertical maintenance procedure for secondary guns: Step 1: Hoist the leak gun to storage position 111, drain the remaining water into the water tank, open the water tank drain valve 54, and discharge it through the water pipe 53 to the demineralized water tank drain trough.

[0043] Step 2: Open the manhole cover 42 for cleaning slag and check whether the scrap steel hopper 51 is located below the secondary gun body; Step 3: Maintenance personnel stand on the east side of the middle platform 4 to clean the residual steel and slag at the lower end of the auxiliary lance. If the slag is too long, use a 32t electric hoist to lift the auxiliary lance and gradually lower it for cleaning. The lifting speed of the electric hoist should be controlled at 2m / min to avoid shaking, until it is clean. Scrap steel bucket 51 is transported from the 26m lifting hole to the scrap steel pile and then added to the converter; each cleaning should avoid the accumulation of scrap steel bucket 51.

[0044] Step 4: Use a 32t electric hoist to lift the cleaned auxiliary gun from the slag removal position 112 to the calibration center position 121.

[0045] Step 5: The maintenance personnel inspected the sub-gun connector connection on the west side of the middle platform 4, addressed the stripping of the external threads M40*2 and M42*1.5, checked the probe signal cable plug, and tightened the plug connector.

[0046] Step Six: If the secondary nozzle is damaged, the maintenance personnel should use a cutting machine to cut the weld between the nozzle and the outer tube on the west side of the middle platform 4, grind it, and inspect the new nozzle: it must not have defects such as sand holes, looseness, air holes, cracks, etc. Replace the 4 neoprene rubber ¢28.2*3.55mm "O-rings", ensure that the inner cavity of the DN114mm nozzle is smooth and flat, fix the nozzle and the outer tube with a 1t jack after alignment, and use argon arc welding to weld the weld. The weld should be continuous and smooth, and must not have defects such as cracks, air holes, slag inclusions, etc., and the undercut should not exceed 1mm.

[0047] Step 7: Verify the verticality and straightness of the secondary gun.

[0048] Step 8: Connect the inlet and outlet flanges of the auxiliary gun water pipes on the 51-meter platform. Use a pressure pump to pressurize and check for leaks. Test at a low pressure of 0.5MPa. If there is no leak after holding the pressure for 5 minutes, proceed to the next step. Increase the pressure to 1.5 times the working pressure of 1.2MPa, i.e., 1.8MPa, and hold the pressure for 30 minutes. If there is a leak, mark it and repair it until it is normal.

[0049] Step 9: Connect the auxiliary gun cooling air supply pipe. The test pressure is 1.5 times the working pressure of 0.6MPa, i.e., 0.9MPa. Hold the pressure for 5 minutes. If there is a leak, check and fix it again until it is normal.

[0050] Step 10: Record the entire process, including the burning gun phenomenon, repair measures, and water pressure test data, in detail in the equipment maintenance file. Hoist the repaired auxiliary gun back to the standby position.

[0051] Example 3: Operating procedure for periodically checking the straightness, sealing, and relative position of the cooling water pipes of the secondary gun vertically.

[0052] Step 1: Preliminary Verification: Use a 32t electric hoist to lift the auxiliary gun to the east side of the left workstation. Fix a plumb bob on the top of the auxiliary gun, and after it is lowered, measure the horizontal deviation of the upper and lower sections of the gun body from the plumb line. The deviation should be ≤ ± 3mm, preliminary verification indicates that this operation should be performed every time the product goes offline; If the horizontal deviation > ± 3mm and ≤ ± 5mm, hoist the secondary gun to the west side of the left workstation, and adjust the horizontal / vertical position of the secondary gun's upper support until it is normal; if the horizontal deviation is > ± If the horizontal deviation is 5mm and ≤±10mm, use hydraulic jacks at 4 points on the middle platform to correct it until it is normal; if the horizontal deviation is > ± If the error is 10mm, the secondary gun will be hoisted to the ground maintenance room for major overhaul and calibration until it is normal.

[0053] Step 3: Precision calibration: Use a laser emitter to project a vertical line, and use a laser receiver to detect the offset of each section of the gun body ≤1mm. Perform precision calibration every 3 months. Step 4: Check the M20mm*1.5 thread condition of the gas source pipe interface to ensure that the molding is complete, there is no corrosion, stripped threads, missing threads, deformation or burrs; if there are any abnormalities, use a wire brush with kerosene to clean the corrosion, and then use a thread file to trim the burrs, or use a die to thread the thread. Step 5: Check that the center-to-center distance between the inlet and outlet cooling water pipes is 425. ± 1mm.

[0054] Step Six: Record the entire process, including repair measures, data before and after calibration, etc., in detail in the equipment maintenance file, and hoist the repaired auxiliary gun back to the standby position.

[0055] At the 26-51 meter platform on the LK line (lines 10-11), an online repair area for the converter's auxiliary lance is established, comprising an upper platform 1 and a lower platform 2. The lower platform 5 has a maintenance power supply box and oxygen / natural gas valve stations located at its edge for easy maintenance. The upper platform 1 houses a cooling water station 14 and compressed air connectors for leak detection and pressurization of the auxiliary lance. When cleaning the auxiliary lance body of adhering steel and residue, the platform's movable cover is opened, and the auxiliary lance is raised and lowered by a 32-ton electric hoist. The lower platform 2 has a scrap steel hopper 51, which is pulled out using pulleys and hoisted from the south side through the lifting hole to the 9.6-meter platform for return to the scrap steel pile, and then back to the converter for smelting. Maintenance personnel can safely and reliably access this platform to perform operations such as slag removal, nozzle replacement, and connector replacement.

[0056] The on-site vertical rapid repair device and method for converter sub-lance has the following functions: 1. After the secondary gun is heated, the remaining water inside has a designated storage and rapid discharge location, providing a basic guarantee for subsequent maintenance operations. If the remaining water in the secondary gun cannot be discharged in time, it will affect other maintenance operations, such as cleaning and straightening. The discharged water is discharged to the demineralized water tank drain trough through the water tank and water inlet pipe 53, ensuring the dryness and safety of the maintenance area.

[0057] Second, cleaning the outer tube of the auxiliary nozzle to remove adhering steel and residue is a prerequisite for subsequent maintenance operations. Only after removing the adhering steel and residue from the outer tube can operations such as nozzle replacement and straightness verification be performed more accurately. The removed waste falls into the waste steel hopper 51, achieving waste recycling.

[0058] 3. After the cleaning work is completed, replace the DN114mm nozzle and plug connector of the auxiliary gun. Only after the outer tube is cleaned can the nozzle and plug connector be replaced accurately to ensure the normal use of the auxiliary gun.

[0059] IV. The straightness of the auxiliary nozzle is calibrated after cleaning and nozzle replacement to ensure it meets requirements, providing a good foundation for subsequent water pressure and sealing tests. Preliminary calibration is performed each time the nozzle is taken off the production line; if it does not meet requirements, correction is necessary.

[0060] V. The water pressure test is conducted after completing the nozzle replacement and straightness verification operations. It is used to test the sealing and pressure resistance of the auxiliary nozzle. Through low-pressure leak testing and leak testing under working pressure, it is ensured that the auxiliary nozzle will not leak during normal use, and it serves as an inspection of the quality of the preceding maintenance operations.

[0061] 6. Inspect the sub-gun connectors online, addressing any external thread defects or other flaws; ensure proper electrical connections and signal transmission with other functional modules. After cleaning and replacing components, inspect and process the connectors to ensure the integrity of the entire sub-gun system.

[0062] VII. Conduct sealing tests and repairs on the secondary gun to further ensure its sealing performance. Through sealing tests, the sealing condition of the secondary gun is checked, and any sealing problems discovered are repaired to ensure that there will be no gas or liquid leakage during use.

[0063] 8. Regularly check the relative positions of the air tube, water inlet pipe, and water return pipe; ensure the normal operation of the sub-gun's air and water systems, and ensure that they work in conjunction with other functional modules to guarantee that the sub-gun's performance meets requirements in all aspects. Regular checks can promptly detect deviations in the relative positions of the air tube, water inlet pipe, and water return pipe, allowing for adjustments and repairs to ensure the normal use of the sub-gun.

[0064] The traditional flat-lying repair process involves hoisting the secondary gun from a high-rise platform to the ground, and then transporting it to the repair shop via a rail-guided flatbed trolley for flat-lying repair.

[0065] High risks during hoisting: The secondary gun operates in high-temperature areas for extended periods, making it prone to accumulating steel and slag. During hoisting, this slag can easily fall and injure people or damage equipment, posing a significant safety risk. Furthermore, the secondary gun is 24,000 mm long but only 114 mm in diameter, making it highly susceptible to bending during hoisting, thus creating a safety hazard during high-altitude operations.

[0066] Maintenance Location: The secondary weapon is hoisted from the high-rise platform to the ground, then transported a considerable distance to the maintenance workshop, where it is maintained in a horizontal position. The maintenance process requires placing the secondary weapon on a level maintenance workbench, around which maintenance personnel perform various maintenance operations.

[0067] Lifting process: The lifting process is complex and risky. The auxiliary gun needs to be lifted over long distances between different equipment and areas, which increases the risk of the auxiliary gun falling or bending, and also affects the production continuity of other equipment (such as LF furnace and RH furnace).

[0068] Maintenance efficiency: Due to the long hoisting time and complicated maintenance process, the total maintenance time is more than 24 hours, resulting in high labor intensity for workers.

[0069] Impact on production continuity: The gun transport trolley needs to pass through the refining area, which directly affects the production continuity of the LF furnace and RH furnace.

[0070] This application uses a vertical repair method: Maintenance location: The maintenance space is integrated between the converter platform spanning 26 meters to 51 meters. The auxiliary lance is raised and lowered vertically by a 32-ton electric hoist to perform maintenance operations.

[0071] The hoisting process avoids complex ground hoisting and long-distance transportation, reduces hoisting steps, lowers the impact of slag falling or water leakage from the secondary lance on the equipment, and avoids the risk of the secondary lance bending during hoisting, while not affecting the production continuity of the LF furnace and RH furnace.

[0072] Maintenance efficiency: Maintenance time has been reduced from the traditional 24 hours to 4 hours, greatly improving maintenance efficiency and reducing the labor intensity of workers.

[0073] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A rapid vertical repair device for converter sub-lances, characterized in that: It includes an upper platform (1) and a lower platform (2). The upper platform (1) is equipped with an inspection unit. The lower platform (2) includes a slag cleaning platform (3), a middle platform (4) and a bottom platform (5). The slag cleaning platform (3), the middle platform (4) and the bottom platform (5) are arranged sequentially from top to bottom.

2. The on-site vertical rapid repair device for converter auxiliary lances according to claim 1, characterized in that: The upper platform (1) is provided with a first opening slot (11) and a second opening slot (12) arranged side by side. The end and opening of the first opening slot (11) are respectively provided with a storage position (111) and a slag cleaning position (112). The end and opening of the second opening slot (12) are respectively provided with a verification center position (121) and a verification straightness position (122). The middle platform (4) is provided with a verification straightness manhole (41) and a slag cleaning manhole (42). The slag cleaning manhole (42) is located below the first opening slot (11). The verification straightness manhole (41) is located below the second opening slot (12). The bottom platform (5) is provided with a scrap steel hopper (51) located below the slag cleaning manhole (42).

3. The on-site vertical rapid repair device for converter auxiliary lances according to claim 2, characterized in that: The detection unit includes a cooling water station (14), which is located at one end of the upper platform (1). The cooling water station (14) is integrated with a compressed air pipe. The upper platform (1) is also provided with a component mounting surface (13).

4. The on-site vertical rapid repair device for converter auxiliary lances according to claim 3, characterized in that: The bottom platform (5) is provided with a scrap steel channel (52) at one end, and a water pipe (53) is connected to the bottom of the bottom platform (5). A drain valve (54) is provided on the water pipe (53).

5. The on-site vertical rapid repair device for converter auxiliary lances according to claim 4, characterized in that: The slag removal platform (3), the middle platform (4) and the bottom platform (5) are connected by a staircase (32), and the slag removal platform (3) is equipped with a guardrail (31).

6. A method for on-site vertical rapid repair of converter sub-lances, implemented using the on-site vertical rapid repair device for converter sub-lances as described in claim 4 or 5, characterized in that... Includes the following steps: Step 1: Hoist the sub-gun to the storage position (111), drain the remaining water, and discharge it through the water pipe (53) after the drain valve (54) is opened; Step 2: Open the manhole cover (42) for cleaning slag and check whether the scrap steel bucket (51) is located below the secondary gun body; Step 3: Hoist the auxiliary gun to the slag removal position (112), clean the auxiliary gun's residual steel and slag on the slag removal platform (3) and the middle platform (4), and the scrap steel bucket (51) receives the material and transports the residual steel and slag to the scrap steel channel (52); Step 4: Hoist the secondary gun from the slag removal position (112) to the calibration center position (121). Step 5: On the middle platform (4), inspect the connection part of the sub-gun connector, deal with the stripped external thread, check the connector of the probe signal line plug and the fastening plug connector; Step 6: Cut and grind the weld between the burnt nozzle and the outer tube, replace and weld a new nozzle; Step 7: Hoist the auxiliary gun from the calibration center position (121) to the calibration straightness position (122) and check the straightness; Step 8: Connect the auxiliary gun inlet and outlet water pipe flanges to the cooling water station (14) and check for leaks; Step 9: Connect the secondary gun cooling air supply pipe and check for leaks; Step 10: Record the processing procedure and inspection data, and hoist the repaired auxiliary gun back to the standby position.

7. The on-site vertical rapid maintenance method for converter auxiliary lances according to claim 6, characterized in that: In step 3, an electric hoist is used to raise and lower the auxiliary gun at a speed of 2 m / min.

8. The on-site vertical rapid maintenance method for converter auxiliary lances according to claim 6, characterized in that: In step 8, the cooling water is pressurized to 0.5 MPa and held for 5 minutes; after confirming there is no leakage, it is pressurized to 1.5 times the working pressure and held for 30 minutes; if leakage occurs, it is marked and repaired to normal.

9. The on-site vertical rapid maintenance method for converter auxiliary lances according to claim 6, characterized in that: In step 9, the compressed air test pressure is 1.5 times the working pressure, and the pressure is maintained for 5 minutes. If leakage occurs, check and reprocess until normal.

10. The on-site vertical rapid maintenance method for converter auxiliary lances according to claim 6, characterized in that: The straightness verification includes preliminary verification and precise verification. The preliminary verification includes: fixing a plumb bob to the top of the sub-gun, and measuring the horizontal deviation of the upper and lower sections of the gun body from the plumb line after it is lowered. The horizontal deviation is required to be ≤ ± 3mm; The precise calibration includes: using a laser emitter to emit a vertical line, and using a laser receiver to detect the offset of each section of the gun body, requiring the offset to be ≤1mm.

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