Steel casing pulling-out equipment

Abstract

The invention belongs to the technical field of building construction, and particularly relates to steel casing pulling-out equipment which comprises a mounting frame, a plurality of first air cylinders are mounted in the mounting frame at equal intervals, a second air cylinder is mounted between every two adjacent first air cylinders, a connecting frame is fixed to the top end of the mounting frame, and a butt-joint plate is fixed to the bottom end of the connecting frame. A first air bag is fixed outside the butt joint plate, an air supply assembly is arranged on one side of the top end of the connecting frame, a vacuum pump is installed at the top end of the connecting frame, a sealing shell is arranged below the mounting frame, and a second air bag is arranged in the sealing shell. The butt-joint plate and the steel casing are sealed through the first air bag, the steel casing and the internal supporting column are sealed through the second air bag, the interior of the steel casing is in a sealed state, the steel casing is subjected to air exhaust through the vacuum pump, the interior of the steel casing can be in a negative pressure state, and the situation that air in the steel casing leaks outwards to turn up a water bottom sludge layer during pulling out can be prevented.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically a steel casing removal device. Background Technology

[0002] Steel casing is an important temporary support structure used in construction, bridge, port and other engineering projects. Its main functions are to stabilize the borehole wall, prevent borehole collapse, isolate surface water and guide the drill bit. After the steel casing is used, it needs to be removed, which requires the use of special removal equipment.

[0003] A Chinese patent with publication number CN106906827B discloses a rapid removal device for protective casings used in the construction of highway bridge pile foundations. The device includes a base plate with a lifting device mounted on it. A hoisting device is mounted on the upper end of the lifting device, and four first locking devices are symmetrically mounted on the lower end of the hoisting device. The lower end of the hoisting device is mounted on a clamping device, and four second locking devices are symmetrically mounted on the lower end of the clamping device. The lifting device, hoisting device, first locking device, clamping device, and second locking devices work together to solve the problem that existing highway bridge pile foundation protective casing removal equipment is difficult to use in narrow spaces.

[0004] The above-mentioned steel casing removal technology relies on hydraulic drive to remove the steel casing in practical applications. However, the core requirement is that there must be an effective support point at the bottom. For the steel casing removal scenario in water, the bottom directly contacts the silt layer at the bottom of the river. The silt is soft and has insufficient bearing capacity. It not only cannot provide a stable bottom support point for the equipment, but also makes it difficult for the special fixing mechanism to be effectively anchored at the bottom of the river. This makes the entire removal operation process cumbersome and difficult to position, greatly increasing the difficulty of operation and construction costs.

[0005] Therefore, the present invention provides a steel casing removal device. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: The steel casing removal device of the present invention includes a mounting frame, a plurality of first cylinders are installed at equal intervals inside the mounting frame, a vibrator is installed at the output shaft end of the first cylinder, a second cylinder is installed between two adjacent first cylinders, a positioning block is fixed at the output shaft end of the second cylinder, a connecting frame is fixed at the top of the mounting frame, a sling is provided at the top of the connecting frame and connected to the hook of an external crane, a docking plate is fixed at the bottom of the connecting frame, a first airbag is fixed outside the docking plate, an air supply component is provided on one side of the top of the connecting frame, a vacuum pump is installed at the top of the connecting frame and connected to the middle of the connecting frame through a pipe, a sealing shell is provided below the mounting frame, a second airbag is provided inside the sealing shell, a first air guide pipe is fixed on one side of the top of the second airbag and the top of the first air guide pipe is connected to the air supply component, and a plurality of limit cylinders are installed at equal intervals at the top of the sealing shell.

[0008] Preferably, the air delivery assembly includes a first suction cylinder fixed to the top of the connecting frame, a second suction cylinder fixed to one side of the first suction cylinder, a first piston disposed inside the first suction cylinder, a second piston disposed inside the second suction cylinder, the first piston and the second piston being fixedly connected by a connecting rod, an air supply pipe fixed to the air outlet end of the first suction cylinder, the bottom end of the air supply pipe being connected to the inside of the first airbag, and an air outlet disposed on one side of the second suction cylinder, the air outlet being connected to the top end of the first air guide pipe.

[0009] Preferably, a spare airbag is provided on the inner side of the sealed housing, and the spare airbag is located on the outer side of the second airbag. A gas storage tank is fixed to the end of the output pipe of the vacuum pump, and a pressure relief valve is installed at the other end of the gas storage tank. A second air guide pipe is fixed on the side of the pressure relief valve away from the gas storage tank. A valve body is fixed to the bottom end of the second air guide pipe. The bottom end of the valve body is connected to the spare airbag, and a valve core is rotatably connected inside the valve body.

[0010] Preferably, a placement shell is fixed to one side of the sealed housing, a support plate is fixed inside the placement shell, a pressure plate is provided on the side of the support plate near the inner side of the sealed housing, a spring is fixed on the side of the pressure plate near the support plate, and the other side of the spring is fixedly connected to the support plate.

[0011] Preferably, a telescopic rod passes through the middle of the spring, one side of the telescopic rod is fixedly connected to the pressure plate, and the other end of the telescopic rod passes through the interior of the support plate.

[0012] Preferably, a steel rope is fixed to the end of the telescopic rod away from the pressure plate. The steel rope passes through the top of the housing. A pull rod is fixed to one side of the valve core via a pivot. The top of the steel rope is fixedly connected to one side of the top of the pull rod.

[0013] Preferably, a coil spring is fixed to the outside of the valve core's rotating shaft, and the other side of the coil spring is fixedly connected to the valve body.

[0014] Preferably, a hook is fixed at the bottom end of the telescopic rod away from the pressure plate, and a rotating column is rotatably connected to the bottom end inside the shell via a connecting block. A hanging ring is fixed at the top of the rotating column, and the hook and the hanging ring can be hooked together.

[0015] Preferably, a toothed plate is engaged with the side of the rotating column away from the support plate, and the toothed plate is slidably connected to the bottom end of the housing.

[0016] Preferably, a pull rope is fixed to the bottom end of the toothed plate, and the pull rope is placed below the housing.

[0017] The beneficial effects of this invention are as follows: 1. The steel casing removal device of the present invention achieves a sealed state inside the steel casing by sealing the connection between the connecting plate and the steel casing with the first airbag and sealing the steel casing and the internal support column with the second airbag. The vacuum pump draws air from the steel casing, which can make the inside of the steel casing negative pressure. During removal, it can prevent the air inside the steel casing from leaking out and stirring up the bottom silt layer.

[0018] 2. The steel casing removal device of the present invention can store part of the air drawn by the vacuum pump through the air storage tank. When the second air bag leaks, the second air guide pipe outputs the air inside the air storage tank to the backup air bag, which can make the backup air bag automatically press against the second air bag to prevent the second air bag from leaking during the removal process, which would cause silt and water to be sucked into the steel casing. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the present invention after installation; Figure 2 This is a schematic diagram of the present invention before installation; Figure 3 This is a schematic diagram of the internal structure of the mounting bracket in this invention; Figure 4 This is a schematic diagram of the connecting frame structure in this invention; Figure 5 This is a schematic diagram of the first airbag structure in this invention; Figure 6 This is a schematic diagram of the second airbag structure in this invention; Figure 7 This is a schematic diagram of the pressure plate structure in this invention; Figure 8 This is a schematic diagram of the hanging ring structure in this invention; Figure 9 This is a schematic diagram of the internal structure of the valve body in this invention.

[0021] In the diagram: 1. Mounting bracket; 11. First cylinder; 111. Vibrator; 12. Second cylinder; 121. Positioning block; 2. Connecting frame; 21. Lifting sling; 22. Vacuum pump; 221. Air tank; 222. Pressure relief valve; 23. First suction cylinder; 231. Second suction cylinder; 232. First piston; 233. Second piston; 234. Air supply pipe; 235. Air outlet; 24. Connecting plate; 241. First airbag; 3. Sealing housing 31. Second airbag; 311. First air guide tube; 32. Limiting cylinder; 33. Second air guide tube; 331. Spare airbag; 332. Valve body; 333. Valve core; 334. Coil spring; 335. Pull rod; 34. Placement shell; 341. Pressure plate; 342. Spring; 343. Support plate; 344. Telescopic rod; 345. Hook; 346. Steel rope; 35. Hanging ring; 351. Rotating column; 352. Toothed plate; 353. Pull rope. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0023] like Figures 1 to 6 As shown in the embodiment of the present invention, a steel casing removal device includes a mounting frame 1. Multiple first cylinders 11 are installed at equal intervals inside the mounting frame 1. A vibrator 111 is installed at the end of the output shaft of each first cylinder 11. A second cylinder 12 is installed between two adjacent first cylinders 11. A positioning block 121 is fixed to the end of the output shaft of the second cylinder 12. A connecting frame 2 is fixed to the top of the mounting frame 1. A lifting cable 21 is provided at the top of the connecting frame 2 and is connected to the hook of an external crane. A pair of... The connecting plate 24 has a first airbag 241 fixed to its exterior. An air supply component is provided on one side of the top of the connecting frame 2. A vacuum pump 22 is installed on the top of the connecting frame 2. The vacuum pump 22 is connected to the middle of the connecting frame 2 through a pipe. A sealing shell 3 is provided below the mounting frame 1. A second airbag 31 is provided inside the sealing shell 3. A first air guide pipe 311 is fixed on one side of the top of the second airbag 31. The top of the first air guide pipe 311 is connected to the air supply component. Multiple limit cylinders 32 are installed at equal intervals on the top of the sealing shell 3. During construction of buildings, bridges, and other structures, it may be necessary to build support columns in water. However, concrete cannot be poured directly into the water, so steel casings are required. These casings are inserted directly into the water, creating a relatively dry space. Concrete is then poured into the casing, and after it solidifies, it forms the support column. The steel casing then needs to be removed from the support column. During removal, the sealing shell 3 is first placed over the steel casing, followed by the mounting bracket 1. The connecting plate 24 at the bottom of the connecting bracket 2 is then aligned with the top of the steel casing. Finally, the connecting bracket 2 is placed over the top of the steel casing. At this point, it is necessary to... The mounting frame 1 and the steel casing are fixed together. The second cylinder 12 is activated to push the positioning block 121. Multiple positioning blocks 121 press on the surface of the steel casing at the same time, which can fix the mounting frame 1 and the steel casing together and at the same time make the center part of the mounting frame 1 fit over the outside of the steel casing. Then the first cylinder 11 is activated to push the vibrator 111 to stick to the outer surface of the steel casing. Next, the sealing shell 3 needs to be fixed. The operator moves the sealing shell 3 to the bottom of the steel casing so that the upper part of the sealing shell 3 fits over the bottom of the steel casing. Then multiple limit cylinders 32 are activated to extend their rods and press against the surface of the steel casing to fix the sealing shell 3. Then the crane hook is connected to the sling 21. When the steel casing is pulled out, the large amount of air inside the casing will cause the lake bottom silt to be stirred up, with a disturbance radius of more than 200 meters. This can easily lead to the diffusion of heavy metals from the lake bottom sediment, polluting the water and seriously disturbing the habitat of aquatic organisms in the ecologically sensitive area. Therefore, before the casing is pulled out, the vacuum pump 22 is started to pump air out of the steel casing. At this time, the inside of the steel casing is under negative pressure. Initially, there is no air contraction inside the first airbag 241. The pressure difference of the negative pressure inside the steel casing causes the first airbag 241 to expand. During the expansion of the first airbag 241, the air supply component will drive the air supply component to supply air to the second airbag 31 through the first air pipe 311. At this time, the gas enters the second airbag 31 and expands. After the second airbag 31 expands, it will stick to the outside of the steel casing. At the same time, the shape of the second airbag 31 allows its lower half to stick to the outside of the support column. At this time, the sealing effect of the second airbag 31 and the first airbag 241 keeps the inside of the steel casing under a closed negative pressure. Next, vibrator 111 is started to vibrate. At this time, the vibration of vibrator 111 is transmitted to the steel casing to assist in its separation from the support column. At the same time, the crane pulls the sling 21 upward, which can remove the steel casing from the outside of the support column. During this process, the inside of the steel casing is always under negative pressure, which can ensure that no air is discharged into the water from its bottom during the removal of the steel casing, thereby preventing the air from stirring up the silt layer at the bottom of the river. This can reduce the disturbance radius to within 50 meters and have a smaller impact on the ecology.

[0024] like Figures 1 to 6As shown, the air delivery assembly includes a first suction cylinder 23 fixed to the top of the connecting frame 2, a second suction cylinder 231 fixed to one side of the first suction cylinder 23, a first piston 232 disposed inside the first suction cylinder 23, a second piston 233 disposed inside the second suction cylinder 231, the first piston 232 and the second piston 233 being fixedly connected by a connecting rod, an air supply pipe 234 fixed to the air outlet end of the first suction cylinder 23, the bottom end of the air supply pipe 234 being connected to the inside of the first airbag 241, and an air outlet 235 disposed on one side of the second suction cylinder 231, the air outlet 235 being connected to the top end of the first air guide pipe 311; When the first airbag 241 is subjected to negative pressure inside the steel casing, the first airbag 241 expands and draws in air through the air supply pipe 234. The gas inside the first suction cylinder 23 is drawn out through the air supply pipe 234. The negative pressure generated inside the first suction cylinder 23 can drive the first piston 232 to move towards the air outlet of the first suction cylinder 23. At this time, the first piston 232 pulls the second piston 233 towards the air outlet 235 through the connecting rod. During this process, the second piston 233 will squeeze the air inside the second suction cylinder 231 and discharge it through the air outlet 235. The air outlet 235 will discharge air into the second airbag 31 through the first air guide pipe 311. At this time, the second airbag 31 can be inflated, so that the first airbag 241 and the second airbag 31 are inflated at the same time to seal the top and bottom of the steel casing, thereby achieving a seal on the steel casing and preventing air leakage during the removal process.

[0025] like Figures 1 to 9 As shown, a spare airbag 331 is provided inside the sealed housing 3. The spare airbag 331 is located outside the second airbag 31. A gas storage tank 221 is fixed to the end of the output pipe of the vacuum pump 22. A pressure relief valve 222 is installed at the other end of the gas storage tank 221. A second air guide pipe 33 is fixed to the side of the pressure relief valve 222 away from the gas storage tank 221. A valve body 332 is fixed to the bottom end of the second air guide pipe 33. The bottom end of the valve body 332 is connected to the spare airbag 331. A valve core 333 is rotatably connected inside the valve body 332. During the process of vacuum pump 22 drawing negative pressure into the steel casing through connecting frame 2, vacuum pump 22 introduces the extracted air into the air storage tank 221. The air storage tank 221 stores some air. When the air pressure exceeds the preset value, the excess air is discharged to the outside through pressure relief valve 222. During the lifting of the steel casing, the second airbag 31 will rub against the support column to ensure sealing. At this time, the second airbag 31 may rupture. After rupture, air will leak from the bottom of the steel casing. This will cause negative pressure to draw sludge and water into the interior of the steel casing, affecting the stability of the extraction. Therefore, in the sealing shell... 3. An internally embedded spare airbag 331 is provided. When the second airbag 31 is damaged and leaks air, the air guide hole of the valve core 333 is connected to the inside of the valve body 332. At this time, the compressed air inside the air tank 221 will be introduced into the valve body 332 through the second air guide pipe 33, and then into the interior of the spare airbag 331 through the valve body 332. This will cause the spare airbag 331 to expand and squeeze the second airbag 31, thereby filling the gap caused by the leakage of the second airbag 31 and preventing air leakage at the sealing position during the removal process. Both the second air guide pipe 33 and the first air guide pipe 311 are long steel wire mesh tubes that can withstand the pressure changes during the inflation process.

[0026] like Figures 1 to 7 As shown, a placement shell 34 is fixed to one side of the sealing shell 3, and a support plate 343 is fixed inside the placement shell 34. A pressure plate 341 is provided on the side of the support plate 343 near the inner side of the sealing shell 3, and a spring 342 is fixed on the side of the pressure plate 341 near the support plate 343. The other side of the spring 342 is fixedly connected to the support plate 343. When the second airbag 31 ruptures and leaks air, the inflation of the backup airbag 331 will be delayed. Therefore, a pressure plate 341 is set inside the housing 34 to press on one side of the backup airbag 331. When the second airbag 31 is fully inflated, the pressure plate 341 will be pushed into the housing 34 by the push of the second airbag 31. At this time, the pressure plate 341 compresses the spring 342. When the second airbag 31 leaks air, the elastic force of the spring 342 is greater than the gas pressure of the second airbag 31. The spring 342 pushes the pressure plate 341 to compress the backup airbag 331 and the second airbag 31, thereby temporarily ensuring that the second airbag 31 fits against the support column before the backup airbag 331 is inflated.

[0027] like Figures 1 to 7 As shown, a telescopic rod 344 passes through the middle of the spring 342. One side of the telescopic rod 344 is fixedly connected to the pressure plate 341, and the other end of the telescopic rod 344 passes through the interior of the support plate 343. During the movement of the pressure plate 341, it will drive the telescopic rod 344. The telescopic rod 344 can be guided by the extension and retraction inside the support plate 343, thereby ensuring that the pressure plate 341 moves in a horizontal state.

[0028] like Figures 1 to 9 As shown, a steel rope 346 is fixed to one end of the telescopic rod 344 away from the pressure plate 341. The steel rope 346 passes through the top of the housing 34. A pull rod 335 is fixed to one side of the valve core 333 via a rotating shaft. The top of the steel rope 346 is fixedly connected to one side of the top of the pull rod 335. Under normal use, the backup airbag 331 does not need to be inflated. Therefore, the valve core 333 will disconnect the gas supply inside the valve body 332. When the air pressure inside the second airbag 31 decreases, the pressure plate 341 will pull the telescopic rod 344. The telescopic rod 344 will pull the steel cable 346, which will pull the lever 335 to rotate. The lever 335 will cause the valve core 333 to rotate inside the valve body 332. When the valve core 333 rotates to a certain angle, the valve body 332 will connect to inflate the backup airbag 331, thus achieving automatic inflation of the backup airbag 331.

[0029] like Figures 1 to 9 As shown, a coil spring 334 is fixed to the outside of the rotating shaft of the valve core 333, and the other side of the coil spring 334 is fixedly connected to the valve body 332. When the air pressure of the second airbag 31 and the spare airbag 331 is greater than the elastic force of the spring 342, the pressure plate 341 will be driven to reset. At this time, the telescopic rod 344 resets, causing the steel cable 346 to relax. At this time, the elastic force of the coil spring 334 will drive the valve core 333 to rotate in the opposite direction. At this time, the valve core 333 will disconnect the internal connection of the valve body 332. At this time, the spare airbag 331 stops inflating, thus realizing automatic disconnection of inflation.

[0030] like Figures 1 to 8 As shown, a hook 345 is fixed at the bottom end of the telescopic rod 344 away from the pressure plate 341. The bottom end inside the housing 34 is rotatably connected to a rotating column 351 via a connecting block. A hanging ring 35 is fixed at the top of the rotating column 351. The hook 345 and the hanging ring 35 can be hooked together. When the second airbag 31 is not inflated, there is no limiting effect on the pressure plate 341, which will cause the spring 342 to push the pressure plate 341 out into the sealed housing 3, affecting the inflation of the second airbag 31. Therefore, a hook 345 is fixed at the bottom of the telescopic rod 344. Before the second airbag 31 is inflated, the hook 345 is engaged with the hanging ring 35. At this time, part of the pressure plate 341 will extend into the sealed housing 3. When the second airbag 31 is inflated, the expansion pushes the pressure plate 341 to drive the telescopic rod 344. At this time, the telescopic rod 344 drives the hook 345 to move away from the support plate 343, thereby separating the hook 345 from the hanging ring 35. During this process, the hanging ring 35 will drive the rotating column 351 to rotate downward due to gravity. During the subsequent extension and retraction of the telescopic rod 344, the hanging ring 35 will not affect the movement of the hook 345, thereby achieving the pre-locking of the position of the telescopic rod 344 and automatically releasing the telescopic rod 344 when in use.

[0031] like Figures 1 to 8 As shown, a toothed plate 352 is engaged with the side of the rotating column 351 away from the support plate 343, and the toothed plate 352 is slidably connected to the bottom end of the housing 34. When the rotating column 351 rotates, it will simultaneously drive the toothed plate 352 to rotate, and the toothed plate 352 can act as a counterweight for the rotating column 351.

[0032] like Figures 1 to 8 As shown, a pull rope 353 is fixed to the bottom end of the toothed plate 352, and the pull rope 353 is placed below the housing 34. After each use, the hook 345 and the hanging ring 35 need to be reconnected. At this time, manually push the pressure plate 341 into the housing 34. The pressure plate 341 drives the telescopic rod 344 to move the hook 345 to the back of the hanging ring 35. Then pull the pull rope 353 to drive the toothed plate 352, which can drive the rotating column 351 to rotate. The rotating column 351 drives the hanging ring 35 to rotate upward. Then release the pressure plate 341 to reconnect the hook 345 and the hanging ring 35, so as to facilitate the reset of the hanging ring 35.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel casing removal device, characterized in that: The system includes a mounting frame, inside which multiple first cylinders are installed at equal intervals. A vibrator is installed at the end of the output shaft of each first cylinder. A second cylinder is installed between two adjacent first cylinders. A positioning block is fixed at the end of the output shaft of the second cylinder. A connecting frame is fixed at the top of the mounting frame, and a sling is installed at the top of the connecting frame. The sling is connected to the hook of an external crane. A docking plate is fixed at the bottom of the connecting frame, and a first airbag is fixed to the outside of the docking plate. An air supply component is installed on one side of the top of the connecting frame, and a vacuum pump is installed at the top of the connecting frame. The vacuum pump is connected to the middle of the connecting frame through a pipe. A sealing shell is installed below the mounting frame, and a second airbag is installed inside the sealing shell. A first air guide pipe is fixed on one side of the top of the second airbag, and the top of the first air guide pipe is connected to the air supply component. Multiple limit cylinders are installed at equal intervals at the top of the sealing shell.

2. The steel casing removal device according to claim 1, characterized in that: The air delivery assembly includes a first suction cylinder fixed to the top of the connecting frame, a second suction cylinder fixed to one side of the first suction cylinder, a first piston inside the first suction cylinder, a second piston inside the second suction cylinder, the first piston and the second piston being fixedly connected by a connecting rod, an air supply pipe fixed to the air outlet end of the first suction cylinder, the bottom end of the air supply pipe being connected to the inside of the first airbag, and an air outlet on one side of the second suction cylinder being connected to the top end of the first air guide pipe.

3. The steel casing removal device according to claim 1, characterized in that: A spare airbag is provided inside the sealed housing. The spare airbag is located outside the second airbag. A gas storage tank is fixed to the end of the output pipe of the vacuum pump. A pressure relief valve is installed at the other end of the gas storage tank. A second air guide pipe is fixed to the side of the pressure relief valve away from the gas storage tank. A valve body is fixed to the bottom end of the second air guide pipe. The bottom end of the valve body is connected to the spare airbag. A valve core is rotatably connected inside the valve body.

4. The steel casing removal device according to claim 3, characterized in that: A placement shell is fixed to one side of the sealed housing. A support plate is fixed inside the placement shell. A pressure plate is provided on the side of the support plate near the inside of the sealed housing. A spring is fixed on the side of the pressure plate near the support plate. The other side of the spring is fixedly connected to the support plate.

5. The steel casing removal device according to claim 4, characterized in that: A telescopic rod runs through the middle of the spring. One side of the telescopic rod is fixedly connected to the pressure plate, and the other end of the telescopic rod runs through the inside of the support plate.

6. The steel casing removal device according to claim 5, characterized in that: A steel rope is fixed to the end of the telescopic rod away from the pressure plate. The steel rope passes through the top of the housing. A pull rod is fixed to one side of the valve core via a pivot. The top of the steel rope is fixedly connected to one side of the top of the pull rod.

7. The steel casing removal device according to claim 6, characterized in that: A coil spring is fixed to the outside of the valve core's rotating shaft, and the other side of the coil spring is fixedly connected to the valve body.

8. The steel casing removal device according to claim 6, characterized in that: The bottom end of the telescopic rod away from the pressure plate is fixed with a hook, and the bottom end inside the shell is rotatably connected to a rotating column via a connecting block. The top of the rotating column is fixed with a hanging ring, and the hook and the hanging ring can be hooked together.

9. The steel casing removal device according to claim 8, characterized in that: A toothed plate is engaged on the side of the rotating column away from the support plate, and the toothed plate is slidably connected to the bottom of the housing.

10. A steel casing removal device according to claim 9, characterized in that: A pull rope is fixed to the bottom of the toothed plate, and the pull rope is placed below the housing.

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