Method and device for disassembling a blast furnace water-cooled gas-tight box

Abstract

The application discloses a high furnace water-cooled airtight box dismounting method and device, and solves the technical problem of complex construction in the water-cooled airtight box dismounting process, wherein the dismounting method comprises the following steps: removing a short section: separating both ends of the short section from a furnace throat corrugator and the water-cooled airtight box of the high furnace, compressing the furnace throat corrugator, and removing the short section; removing a distribution chute; removing the furnace throat corrugator, cutting the lower end of an intermediate hopper of the high furnace to separate the furnace throat corrugator from the intermediate hopper, and removing the furnace throat corrugator; removing the water-cooled airtight box, cutting the water-cooled airtight box at the connection with the furnace body of the high furnace, transferring the water-cooled airtight box to a transport device, and removing the water-cooled airtight box through the transport device. By cutting the lower part of the intermediate hopper, the time for dismounting the equipment can be effectively shortened, the water-cooled airtight box is removed through the transport device, time and labor are saved, and the efficiency of dismounting the water-cooled airtight box is improved.

Description

Technical Field

[0001] This application belongs to the technical field of blast furnace equipment, specifically relating to a method and device for disassembling a blast furnace water-cooled airtight box. Background Technology

[0002] The water-cooled airtight box of the blast furnace is severely damaged due to the pins on the crank arm and the mounting chute, posing a serious equipment hazard to normal production. Therefore, it is necessary to disassemble the airtight box of the No. 3 blast furnace during a lengthy maintenance period. The water-cooled airtight box is quite heavy, weighing approximately 38 tons. The disassembly process involves various related equipment from mechanical, hydraulic, electrical, and automation disciplines. Furthermore, the upper flange of the water-cooled airtight box is connected to the short section, corrugated compensator, and intermediate funnel, while the lower water jacket is connected to the large flange on the furnace top. The entire water-cooled airtight box is situated between various platforms in a confined space, making the construction process complex. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides a method and device for dismantling a blast furnace water-cooled gas-tight box, which solves the technical problem of complex construction during the dismantling process of the water-cooled gas-tight box in the prior art.

[0004] The technical solution adopted to achieve the purpose of this application is a method for disassembling a blast furnace water-cooled gas-tight box, comprising the following steps:

[0005] Remove the short section: separate both ends of the short section from the blast furnace throat bellows and water-cooled gas-tight box, compress the throat bellows in a direction away from the short section, and remove the short section;

[0006] Dismantling the feeding chute: Rotate the feeding chute to the manhole of the blast furnace and dismantle the feeding chute through the manhole;

[0007] Remove the throat bellows: Cut open the lower end of the intermediate funnel of the blast furnace to separate the throat bellows from the intermediate funnel and remove the throat bellows.

[0008] Dismantle the water-cooled airtight box: Cut the connection between the water-cooled airtight box and the furnace body of the blast furnace, transfer the water-cooled airtight box to the transport equipment, and remove the water-cooled airtight box through the transport equipment.

[0009] Preferably, the compression of the furnace throat bellows in the direction away from the short section specifically includes: compressing the furnace throat bellows in the direction away from the short section with a compression amount of 80-100mm.

[0010] Preferably, in the step of dismantling the water-cooled airtight box, the transport equipment moves out of the water-cooled airtight box in a horizontal direction.

[0011] Preferably, the removal of the short section further includes:

[0012] A first chain hoist is installed on the intermediate funnel, and the short section is locked by a first rope;

[0013] The first rope is attached to the first chain hoist, and the short section is lifted by the first chain hoist so that the lower end of the short section is separated from the upper end of the water-cooled airtight box.

[0014] A second chain hoist is installed on the horizontal plane where the water-cooled airtight box is located. After the first rope is detached from the first chain hoist, it is hung on the second chain hoist so that the second chain hoist moves out of the short section in the horizontal direction.

[0015] Preferably, in the step of removing the furnace throat bellows: before cutting the lower end of the intermediate funnel, a second rope is installed on the furnace throat bellows, the second rope is hung on the first chain hoist, and the furnace throat bellows is lifted by the first chain hoist;

[0016] After the lower end of the intermediate funnel is cut open, the process further includes using the first chain hoist to lower the furnace throat corrugated valve back, so that the intermediate funnel is separated from the furnace throat corrugated valve, and the second rope is disconnected from the first chain hoist and then hung on the second chain hoist, so that the second chain hoist moves out of the furnace throat corrugated valve in a horizontal direction.

[0017] Preferably, the dismantling of the water-cooled airtight box further includes: suspending at least one weighing hopper column of the blast furnace to a third chain hoist via a third rope; setting a lifting part at the corresponding position of the water-cooled airtight box and the third chain hoist; connecting the lifting part to the third chain hoist so that the third chain hoist lifts the water-cooled airtight box away from the furnace body with a lifting amount of 1000-1200mm.

[0018] Preferably, a lifting member is provided at the bottom of the water-cooled airtight box, and before the third chain hoist lifts the water-cooled airtight box, the lifting member is used to lift the water-cooled airtight box.

[0019] This application also provides a dismantling device for implementing the above-described method for dismantling a blast furnace water-cooled gas-tight box, comprising:

[0020] The working platform is located at the connection between the water-cooled airtight box and the furnace body;

[0021] Two rails are installed on the working platform;

[0022] The transport equipment is slidably connected to the guide rail.

[0023] Preferably, the distance between the two tracks is greater than the diameter of the bottom flange of the water-cooled airtight box.

[0024] Preferably, the transport equipment includes wheels and a vehicle body, wherein the vehicle body is a frame structure;

[0025] The working platform includes a support beam corresponding to the position of the track, and the track is disposed on the support beam.

[0026] As can be seen from the above technical solution, this application provides a method and device for disassembling a blast furnace water-cooled airtight box. The disassembly method includes the following steps: removing the short section: separating the two ends of the short section from the blast furnace throat bellows and the water-cooled airtight box, compressing the throat bellows in a direction away from the short section, and removing the short section; removing the feeding chute: rotating the feeding chute to the manhole of the blast furnace, and removing the feeding chute through the manhole; removing the throat bellows: cutting the lower end of the intermediate funnel of the blast furnace to separate the throat bellows from the intermediate funnel, and removing the throat bellows; removing the water-cooled airtight box: cutting the connection between the water-cooled airtight box and the furnace body of the blast furnace, transferring the water-cooled airtight box to a transport device, and removing the water-cooled airtight box through the transport device. By cutting open the lower part of the middle funnel, the time for disassembling and assembling the equipment can be effectively reduced. At the same time, the water-cooled airtight box can be moved out by transportation equipment, saving time and effort and improving the efficiency of disassembling and assembling the water-cooled airtight box. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the installation of the blast furnace water-cooled airtight box in an embodiment of this application.

[0028] Figure 2 This is a side view of the disassembly device structure in an embodiment of this application.

[0029] Figure 3 This is a top view of the disassembly device structure in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the transportation equipment structure in an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 100-Blast furnace; 101-Water-cooled gas-tight box; 102-Short section; 103-Furnace throat bellows; 104-Cutting line; 105-Intermediate funnel; 106-Planetary reducer; 107-Burning chute; 108-Manhole; 109-Support beam; 200-Disassembly device; 201-Working platform; 202-Railway; 203-Transportation equipment; 2031-Car body; 2032-Wheel. Detailed Implementation

[0032] To enable those skilled in the art to better understand this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The water-cooled airtight box 101 of the blast furnace 100 is the main transmission device of the charging device. It transmits the rotation and tilting motion of the chute output from the planetary reducer 106 to the rotating cylinder and tilting gearbox of the chute, respectively, so that the charging chute 107 can both rotate and swing. When the charging device charges the ironmaking raw materials into the blast furnace 100 through the intermediate funnel 105, the raw materials enter the charging chute 107 through the furnace throat bellows, the short section 102 and the central throat pipe installed in the water-cooled transmission gearbox. After the charging chute 107 rotates and swings, the requirements for single-ring, multi-ring, fixed-point and fan-shaped charging of the ironmaking raw materials entering the furnace are achieved.

[0034] Example 1:

[0035] In this embodiment of the application, a method for disassembling a water-cooled airtight box 101 of a blast furnace 100 includes the following steps:

[0036] Remove the short section 102: Separate both ends of the short section 102 from the throat bellows 103 and the water-cooled airtight box 101 of the blast furnace 100, compress the throat bellows 103 in a direction away from the short section 102, and remove the short section 102. Specifically, compressing the throat bellows 103 in a direction away from the short section 102 includes compressing the throat bellows 103 with a compression amount of 80-100mm in a direction away from the short section 102.

[0037] The upper end of the short section 102 is equipped with a flange at the connection point with the furnace throat bellows 103, and the lower end of the short section 102 is equipped with a flange at the connection point with the water-cooled airtight box 101. The flanges at the connection points are connected by connecting bolts. Therefore, to separate the two ends of the short section 102 from the furnace throat bellows 103 and the water-cooled airtight box 101 of the blast furnace 100, the connecting bolts between the short section 102 and the furnace throat bellows 103 and the connecting bolts between the short section 102 and the water-cooled airtight box 101 can be cut off using a gas welding tool, thereby separating the two ends of the short section 102 from the furnace throat bellows 103 and the water-cooled airtight box 101 of the blast furnace 100.

[0038] To facilitate the compression of the flue 103, specifically, the four sets of fixing bolts of the flue 103 can be disconnected. Then, four jacks are placed under the four corners of the flue 103, and the flue 103 is compressed at a rate of 80-100mm away from the short section 102. The compression amount can be 80mm, 82mm, 85mm, 87mm, 89mm, 90mm, 93mm, 96mm, 98mm, or 100mm. By compressing the flue 103, it is possible to either separate the flue 103 from the short section 102 using the jacks, or completely separate the short section 102 from the flue 103, facilitating subsequent removal of the short section 102.

[0039] To maintain the compression of the furnace throat bellows 103, channel steel can be fixedly welded to the furnace throat bellows 103, with one end connected to the upper end of the furnace throat bellows 103 and the other end connected to the lower end of the furnace throat bellows 103. To further maintain the compression stability of the furnace throat bellows 103, four channel steels can be used, evenly distributed on the furnace throat bellows 103, and the channel steels can be No. 10 channel steel.

[0040] To facilitate the removal of the short section 102, the specific removal of the short section 102 also includes: installing a first chain hoist on the intermediate funnel 105 and locking the short section 102 with a first rope; hanging the first rope on the first chain hoist and lifting the short section 102 with the first chain hoist so that the lower end of the short section 102 is separated from the upper end of the water-cooled airtight box 101; setting a second chain hoist on the horizontal plane where the water-cooled airtight box 101 is located, and hanging the first rope on the second chain hoist after separating it from the first chain hoist so that the second chain hoist moves the short section 102 out in the horizontal direction.

[0041] There are two first chain hoists, each installed on the flanges of the two outer arc surfaces of the central funnel 105. The diagonal of the short section 102 is locked by two first ropes, and the locking points of the first ropes are then attached to the first chain hoists. The first ropes can be steel wire ropes. The first chain hoist is a 2T chain hoist, and the second chain hoist is a 1T chain hoist.

[0042] Remove the feeding chute 107: Rotate the feeding chute 107 to the manhole 108 of the blast furnace 100, and remove the feeding chute 107 through the manhole 108.

[0043] The manhole 108 is a large square hole, which facilitates the disassembly of the fabric chute 107.

[0044] The dismantling of the charging chute 107 also includes rotating the charging chute 107 to the manhole 108 of the blast furnace 100. To facilitate subsequent dismantling, the charging chute 107 can be rotated to the center of the manhole 108, and its swing angle can be opened to the maximum angle for easy dismantling. Since the charging chute 107 needs to be dismantled from the manhole 108 of the blast furnace 100, its swing angle can be opened to the maximum angle extending beyond the manhole 108. Then, using a 75T overhead crane, a central pulley block, and wire rope hooks, the installation platform is moved from inside the blast furnace 100 to an installation platform outside the blast furnace 100. The central pulley block is then removed, completing the dismantling of the charging chute 107. After the charging chute 107 is dismantled, the crank arm of the water-cooled airtight box 101 is stopped at its highest point, i.e., the maximum angle when the water-cooled airtight box is in operation.

[0045] Remove the throat bellows 103: Cut open the lower end of the intermediate funnel 105 of the blast furnace 100 to separate the throat bellows 103 from the intermediate funnel 105 and remove the throat bellows 103.

[0046] In the step of dismantling the furnace throat bellows 103: before cutting the lower end of the intermediate funnel 105, a second rope is installed on the furnace throat bellows 103, and the second rope is hung on the first chain hoist. The furnace throat bellows 103 is lifted by the first chain hoist. The second rope can be a steel wire rope. The furnace throat bellows 103 can be tied with two 4-point steel wire ropes. Then, the locking part of the second rope is tied to two 2T first chain hoists installed on the flanges of the two outer arc surfaces of the intermediate funnel 105. The furnace throat bellows 103 is then suspended by the first chain hoist, which makes it easier to cut the intermediate funnel 105 later.

[0047] The lower end of the intermediate funnel 105 of the blast furnace 100 can be cut open by using a gas welding tool to cut open the circular weld joint of the lower straight section of the intermediate funnel 105.

[0048] After the lower end of the intermediate funnel 105 is cut, the process also includes lowering the furnace throat bellows 103 by the first chain hoist to separate the intermediate funnel 105 from the furnace throat bellows 103, and then detaching the second rope from the first chain hoist and hanging it on the second chain hoist so that the second chain hoist moves out of the furnace throat bellows 103 in a horizontal direction.

[0049] Before dismantling the water-cooled airtight box 101, the accessories inside the water-cooled airtight box 101 are also removed, specifically the planetary reducer 106. The planetary reducer 106 is installed on the upper part of the water-cooled airtight box 101, and the fabric chute 107 is installed on the hook of the water-cooled airtight box 101. The rotation and tilting motion output by the planetary reducer 106 are respectively transmitted to the rotating cylinder of the fabric chute 107 and the tilting motion of the fabric chute 107, so that the fabric chute 107 can both rotate and swing. The specific steps for removing the planetary reducer 106 are as follows:

[0050] First, disconnect the thin oil pipes connected to the planetary reducer 106. These pipes include two inlet pipes and one return pipe; remove all three. Next, remove the eight fixing bolts connecting the planetary reducer 106 to the water-cooled airtight box 101. Remove the β-angle indicator above the planetary reducer 106, as the connector and mounting key between the β-angle indicator and the drive shaft of the planetary reducer 106 are small and need to be protected from loss. Remove the connecting connector of the α-angle indicator connected to the planetary reducer 106, pull out the nylon rod inside the connector, and reassemble it. Then, remove the four anchor bolts of the α-angle indicator and move the indicator off the mounting platform outside the water-cooled airtight box 101. Install a 5T chain hoist on the crank arm of the throttle valve directly above the planetary reducer 106, and attach it to the two lifting points on the planetary reducer 106 body. Once all parts connected to the planetary reducer 106 have been removed, the 5T chain hoist can be used to lift the planetary reducer 106.

[0051] In addition, the nitrogen pipes, water inlet pipes, and glycerin pipes around the water-cooled airtight box 101 were removed.

[0052] Dismantle the water-cooled airtight box 101: Cut the connection between the water-cooled airtight box 101 and the furnace body of the blast furnace 100, transfer the water-cooled airtight box 101 to the transport equipment 203, and remove the water-cooled airtight box 101 through the transport equipment 203.

[0053] The bottom of the water-cooled airtight box 101 is connected to the furnace body of the blast furnace 100 via a steel ring. The bolts connecting to the steel ring can be removed first, and then the weld joint can be cut open using a gas welding tool. Then, positioning blocks can be welded to the bottom of the water-cooled airtight box 101. One, two, three, or four blocks can be welded, preferably four.

[0054] The dismantling of the water-cooled airtight box 101 also includes: hanging at least one weighing hopper column of the blast furnace 100 onto a third chain hoist via a third rope; setting a lifting part at the corresponding position of the water-cooled airtight box 101 and the third chain hoist; connecting the lifting part to the third chain hoist so that the third chain hoist lifts the water-cooled airtight box 101 away from the furnace body with a lifting capacity of 1000-1200mm; wherein the lifting capacity can be 1000mm, 1030mm, 1055mm, 1085mm, 1100mm, 1115mm, 1127mm, 1153mm, 1172mm or 1200mm.

[0055] The weighing hopper is generally equipped with four uprights at the bottom. Each of the four uprights can be attached to a corresponding third chain hoist using a third rope. The bottom is then connected to the lifting part of the water-cooled airtight box 101. To improve the stability of the connection, the bottom of the third chain hoist can be engaged with the lifting part of the water-cooled airtight box 101 using a snap ring. The snap ring can be a No. 20 snap ring, and the third chain hoist is a 20T chain hoist.

[0056] To ensure the stable lifting of the water-cooled airtight box 101 by the third chain hoist, a lifting component is provided at the bottom of the water-cooled airtight box 101. Before the third chain hoist lifts the water-cooled airtight box 101, the lifting component is used to lift the water-cooled airtight box 101. The lifting component consists of four jacks. These four jacks are placed at the opening of the steel ring, and then the four positioning blocks are lifted to completely separate the water-cooled airtight box 101 from the ring opening. This facilitates the lifting of the water-cooled airtight box 101 by the third chain hoist, thereby improving disassembly efficiency.

[0057] To facilitate the removal of the water-cooled airtight box 101, during the dismantling of the water-cooled airtight box 101, the transport equipment 203 moves the water-cooled airtight box 101 out in a horizontal direction. After the water-cooled airtight box 101 is lifted, the transport equipment 203 can be moved to the bottom of the water-cooled airtight box 101. To facilitate the movement of the transport equipment 203, a support beam 109 can be set on the working platform 201 between the water-cooled airtight box 101 and the blast furnace 100. The support beam 109 is equipped with a track 202. The transport equipment 203 travels on the track 202. After the transport equipment 203 is placed at the bottom of the water-cooled airtight box 101, the water-cooled airtight box 101 is lowered back onto the transport equipment 203 by four 20T third chain hoists. Then, the water-cooled airtight box 101 is detached from the third chain hoists. To facilitate the stable removal of the water-cooled airtight box 101 from the transport equipment 203, a fourth chain hoist can be set on the transport equipment 203. The water-cooled airtight box 101 is fixed to the transport equipment 203 by the fourth chain hoist and steel wire rope, ensuring that the transport equipment 203 is stably removed from the water-cooled airtight box 101.

[0058] Example 2:

[0059] Based on the same inventive concept, this application also provides a dismantling device 200 for implementing the above-described dismantling method of the water-cooled gas-tight box 101 of the blast furnace 100, comprising: a working platform 201, two rails 202 and a transport device 203, wherein the working platform 201 is located at the connection between the water-cooled gas-tight box 101 and the furnace body; the two rails 202 are located on the working platform 201; and the transport device 203 is slidably connected to the guide rails.

[0060] To facilitate the transport of the water-cooled airtight box 101, in some embodiments, the distance between the two rails 202 is greater than the diameter of the bottom flange of the water-cooled airtight box 101. That is, the opening of the bottom flange of the water-cooled airtight box 101 can fall onto the transport equipment 203, facilitating the stable transport of the water-cooled airtight box 101 by the transport equipment 203.

[0061] In some embodiments, the transport equipment 203 includes wheels and a vehicle body 2031, the vehicle body 2031 being a frame structure; the work platform 201 includes a support beam 109 corresponding to the position of the track 202, the track 202 being disposed on the support beam 109. The support beam 109 can be made of 40# I-beams welded together, and can be welded to the work platform 201. The guide rails are welded to the plane of the centerline of the support beam 109, wherein the guide rail welding uses 100 / 200 intermittent welding; the remaining parts are fully welded, the weld height is 4-5mm, and the parallelism and flatness of the two guide rails are required to be less than 0.5 / 1000.

[0062] The frame structure of the vehicle body 2031 is specifically formed by welding 20# channel steel into a square shape, and the side length is determined by the diameter of the lower flange of the water-cooled airtight box 101.

[0063] The vehicle can have 2 or 4 wheels, preferably 4. Two wheels are installed in each direction along the guide rail, for a total of 4 wheels. The wheels are mounted on the guide rail and slidably connected to the corresponding track 202. The vehicle body 2031 also has a drive mechanism. The drive mechanism can have a traction pile installed at the front end of the plane where the water-cooled airtight box 101 and blast furnace 100 are located. A winch is installed on the traction pile, and the winch can have 2... The pulley block 2 is attached to the front of the car body 2031. Starting the winch will move the car body 2031 horizontally along the track 202. The trolley can then be moved to the 75T overhead crane located in front of track 202, where the water-cooled airtight box 101 can be lifted to the loading system for subsequent replacement or repair.

[0064] Furthermore, after disassembling the water-cooled airtight box, it can be reassembled in reverse order of disassembly, i.e., in the following sequence: water-cooled airtight box; furnace throat bellows; planetary reducer; feeding chute; nitrogen pipeline, inlet and outlet water pipes, and dry / thin oil pipes. This application allows for the reassembly of the water-cooled airtight box using a disassembly device. The water-cooled airtight box is then transported back to the top of the furnace body using transport equipment, and the relevant connecting parts are then connected. The use of transport equipment to place the water-cooled airtight box onto the top of the furnace body saves time and labor, thus improving the efficiency of water-cooled airtight box replacement.

[0065] In addition, the installation of the refilled furnace throat bellows; planetary reducers; charging chutes; nitrogen pipelines, inlet and outlet water pipes and dry and thin oil pipes can be carried out by referring to the installation steps in the existing technology, and will not be described in detail here.

[0066] Through the above embodiments, this application has the following beneficial effects or advantages:

[0067] 1) By cutting open the lower part of the intermediate funnel, this application can effectively reduce the time for disassembling and assembling equipment. At the same time, by moving the water-cooled airtight box out through the transportation equipment, it saves time and effort and improves the efficiency of disassembling and assembling the water-cooled airtight box.

[0068] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0069] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for disassembling a water-cooled gas-tight box for a blast furnace, characterized in that, Includes the following steps: Removing the short section: Using a gas welding tool, cut off the connecting bolts between the short section and the furnace throat bellows to separate both ends of the short section from the furnace throat bellows and water-cooled gas-tight box of the blast furnace. Compress the furnace throat bellows in a direction away from the short section and remove the short section. Dismantling the feeding chute: Rotate the feeding chute to the manhole of the blast furnace and dismantle the feeding chute through the manhole; Removing the throat bellows: Cut open the lower end of the intermediate funnel of the blast furnace to separate the throat bellows from the intermediate funnel, and remove the throat bellows; before cutting open the lower end of the intermediate funnel, install a second rope on the throat bellows, hang the second rope on a first chain hoist, and lift the throat bellows using the first chain hoist; after cutting open the lower end of the intermediate funnel, lower the throat bellows using the first chain hoist to separate the intermediate funnel from the throat bellows, detach the second rope from the first chain hoist, and hang it on a second chain hoist so that the second chain hoist moves out of the throat bellows horizontally; Dismantling the water-cooled airtight box: At least one weighing hopper column of the blast furnace is suspended from a third chain hoist by a third rope. A lifting device is provided at the bottom of the water-cooled airtight box. Before the third chain hoist lifts the water-cooled airtight box, the lifting device lifts the water-cooled airtight box. The connection between the water-cooled airtight box and the furnace body of the blast furnace is cut. The water-cooled airtight box is transferred to a transport device. The water-cooled airtight box is moved out horizontally by the transport device to dismantle the water-cooled airtight box.

2. The method for dismantling the blast furnace water-cooled airtight box as described in claim 1, characterized in that, The compression of the furnace throat bellows in the direction away from the short section specifically includes: compressing the furnace throat bellows in the direction away from the short section with a compression amount of 80-100mm.

3. The method for disassembling the blast furnace water-cooled airtight box as described in claim 1, characterized in that, The removal of the short section also includes: A first chain hoist is installed on the intermediate funnel, and the short section is locked by a first rope; The first rope is attached to the first chain hoist, and the short section is lifted by the first chain hoist so that the lower end of the short section is separated from the upper end of the water-cooled airtight box. A second chain hoist is installed on the horizontal plane where the water-cooled airtight box is located. After the first rope is detached from the first chain hoist, it is hung on the second chain hoist so that the second chain hoist moves out of the short section in the horizontal direction.

4. The method for disassembling the blast furnace water-cooled airtight box as described in claim 1, characterized in that, The dismantling of the water-cooled airtight box also includes: setting a lifting part at the corresponding position of the water-cooled airtight box and the third chain hoist, connecting the lifting part to the third chain hoist so that the third chain hoist lifts the water-cooled airtight box in a direction away from the furnace body with a lifting amount of 1000-1200mm.

5. A dismantling device for implementing the dismantling method of the blast furnace water-cooled gas-tight box according to any one of claims 1-4, characterized in that, include: The working platform is located at the connection between the water-cooled airtight box and the furnace body; Two rails are installed on the working platform; The transport equipment is slidably connected to the guide rail.

6. The disassembly device as described in claim 5, characterized in that, The distance between the two rails is greater than the diameter of the bottom flange of the water-cooled airtight box.

7. The disassembly device as described in claim 6, characterized in that, The transport equipment includes wheels and a vehicle body, the vehicle body being a frame structure; the work platform includes a support beam corresponding to the position of the track, and the track is located on the support beam.

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