Heavy water reactor nuclear power plant auxiliary facility sleeve dismounting device

Abstract

The invention belongs to the technical field of heavy water reactor nuclear power plant auxiliary facilities, and particularly relates to a heavy water reactor nuclear power plant auxiliary facility sleeve dismounting device. Two turning cover lugs are arranged on one side of the upper part of the main frame, and a turning cover is mounted on the turning cover lugs; the linear sliding tables are installed on short square steel transversely arranged in the middle of the main frame in parallel, each linear sliding table is provided with two sliding table sliding blocks, and the sliding table sliding blocks are connected with the bottom of the lifting bottom plate so that the lifting bottom plate can slide on the linear sliding tables. A transverse moving bearing seat cushion block is welded to rectangular steel in the middle of a main frame, a transverse moving bearing seat is fixed to the transverse moving bearing seat cushion block, a transverse moving ruler is welded to the upper surface of the transverse moving bearing seat, one end of a transverse moving lead screw penetrates through a bearing in the transverse moving bearing seat to be connected with a transverse moving hand wheel, and the other end of the transverse moving lead screw penetrates through a transverse moving mounting hole of a lifting bottom plate to be connected with a transverse moving nut in a matched mode. The transverse moving nut is fixedly installed on the lifting bottom plate, and when the transverse moving hand wheel is rotated, the transverse moving nut drives the lifting bottom plate to move front and back. The sleeve dismounting efficiency is improved, and the safety of personnel and equipment is ensured.

Description

Technical Field

[0001] This invention belongs to the technical field of auxiliary facilities for heavy water reactor nuclear power plants, and specifically relates to a bushing disassembly and assembly device for auxiliary facilities of heavy water reactor nuclear power plants. Background Technology

[0002] The auxiliary facilities of heavy water reactor nuclear power plants provide services such as inspecting the pusher head of the refueling machine, replacing faulty sealing plugs and shielding plugs, and manually loading new fuel. Under normal operating conditions, the auxiliary facilities contain a large sleeve. When performing tasks such as replacing faulty shielding plugs, inspecting pusher heads, or manually loading new fuel, this large sleeve needs to be replaced with a smaller sleeve. The smaller sleeve, weighing approximately 60 kg, is placed on a fixed shelf in the auxiliary facility room. During replacement, two operators wearing air-filled suits must lift it to the auxiliary facility, align it with the opening, and push it into the facility. Wearing air-filled suits while carrying this heavy load is extremely inconvenient and poses a tripping risk. Furthermore, when aligning the sleeve, operators rely entirely on their back strength for support, and the alignment gap is approximately 1 mm, requiring repeated adjustments, which can be physically harmful. In view of these issues, a sleeve disassembly and assembly device for the auxiliary facilities is designed to provide effective support and alignment adjustment, reduce operator risks, improve sleeve disassembly and assembly efficiency, and ensure the safety of personnel and equipment. Summary of the Invention

[0003] The purpose of this invention is to provide a bushing disassembly and assembly device for auxiliary facilities of heavy water reactor nuclear power plants, which is adapted to the operation requirements of the confined space of nuclear power plants, reduces the risk and physical burden of personnel disassembly and assembly work, improves the efficiency of bushing disassembly and assembly, and ensures the safety of personnel and equipment during the disassembly and assembly process.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A device for disassembling and assembling bushings for auxiliary facilities in a heavy water reactor nuclear power plant: Two flip-top lugs are provided on one side of the upper part of the main frame, and flip-top lugs are installed on the flip-tops; linear slides are installed side by side on short square steel arranged transversely in the middle of the main frame, and each linear slide is equipped with two slide sliders. The slide sliders are connected to the bottom of the lifting base plate, allowing the lifting base plate to slide on the linear slides; a transverse bearing seat pad is welded to the middle rectangular steel of the main frame, the transverse bearing seat is fixed to the transverse bearing seat pad, a transverse scale is welded to the upper surface of the transverse bearing seat, and a transverse lead screw is... One end passes through the bearing in the transverse bearing housing and connects to the transverse handwheel; the other end passes through the transverse mounting hole in the lifting base plate and connects to the transverse nut. The transverse nut is fixed to the lifting base plate. When the transverse handwheel is rotated, the transverse nut moves the lifting base plate back and forth. Worm gear mechanisms are installed at both ends of the middle of the lifting base plate, connected by a coupling via a drive shaft. The input end of the right-side worm gear mechanism is fitted with the lifting handwheel. A lifting scale is welded to the lifting base plate near the lifting handwheel. The output screws of the two worm gear mechanisms pass through the mounting holes of the upper guide rail transverse base plate and are connected to the lifting nuts. The lifting nuts are fixedly mounted on the guide rail transverse base plate. When the lifting handwheel is rotated, the lifting nuts move the guide rail transverse base plate up and down. Guide holes are provided at the four corners of the guide rail transverse base plate, and lifting sleeves are installed in these holes. The lifting sleeves are fixedly connected to the guide rail transverse base plate. Four linear guide rails are installed parallel to each other on the guide rail transverse base plate, with each pair of linear guide rails forming a group. Each linear guide rail has two guides mounted on it. The guide rail slider consists of two adjacent guide rail sliders that are fixed to the liner pad by bolts, so that the two guide rail sliders move synchronously. The liner pad is fixed to the lower liner of the sleeve. On the right side of the two lower liners of the sleeve, there are two clamping flip plates connected to the sides with gaps. The upper part of the clamping flip plate is designed with an arc-shaped opening, which cooperates with the butterfly bolt. When the upper liner of the sleeve is stacked on the lower liner of the sleeve, the clamping flip plate is rotated to the upper butterfly bolt, and the butterfly bolt is tightened to connect the upper and lower liners into a whole to lock the sleeve.

[0005] The main frame is welded together from 6 horizontally arranged rectangular steel bars, 4 longitudinally arranged rectangular steel bars, 8 horizontally arranged short rectangular steel bars, and 4 longitudinally arranged short rectangular steel bars.

[0006] The bottom, middle and back of the main frame are welded steel plates to form independent spaces. Three storage drawers of the same height are arranged in the upper part, and five storage cabinets are set in the lower part. The interior spaces of the cabinets are interconnected, with three cabinet doors in the front and two cabinet doors on the left and right. All three storage drawers and five cabinet doors are equipped with handles.

[0007] The main frame is equipped with casters at the four corners of its bottom, each with a brake; there are two moving handles on the right side of the main frame and two equal-length forward stop rings on the left side of the main frame.

[0008] The flip cover consists of four small square steel bars, a hollowed-out stainless steel plate, and two hinges. The two hinges are fitted with the two flip cover lugs on the main frame, allowing the flip cover to rotate 270 degrees.

[0009] The lifting platform has four guide pillars at its four corners. The guide pillars are designed in the form of steps, with a larger lower cylinder and a smaller upper cylinder.

[0010] The liner pad is connected and fixed to the lower liner of the sleeve by two spring bolts, so that the gap between the lower liner of the sleeve and the liner pad is elastically adjustable.

[0011] On the right side, the two sleeve under bushing blocks are connected by clamping flip plate pin bolts on both sides, and there are two clamping flip plates, which can rotate 360 ​​degrees.

[0012] Removing the auxiliary facility sleeve: Rotate the flip cover 270 degrees to make it hang vertically downwards, loosen the butterfly bolts, and remove the upper bushing of the sleeve; push the device next to the auxiliary facility, aligning the empty compartment with the auxiliary facility opening, with the forward stop ring on the left side of the main frame pressed against the auxiliary facility wall, and brake the universal wheels installed at the four corners of the bottom of the main frame; rotate the lifting handwheel to lower the lower bushing of the sleeve to a height lower than the auxiliary facility opening, without affecting the pulling out of the sleeve; pull the sleeve out half its length from the auxiliary facility, rotate the lifting handwheel and the horizontal movement handwheel to raise the lower bushing of the sleeve to a position that fits against the sleeve and supports it, and adjust the lifting handwheel and the horizontal movement handwheel to make the vertical and horizontal clearances between the sleeve and the auxiliary facility opening the same; pull the sleeve out completely from the auxiliary facility, install the upper bushing of the sleeve, lock the sleeve, flip the flip cover to protect the sleeve; release the brakes on the universal wheels, push the device to the normal storage position, and brake the universal wheels again. The removal of the auxiliary facility sleeve is now complete.

[0013] Install the auxiliary facility sleeve: Rotate the flip cover 270 degrees to make it hang vertically downwards, move the device to the auxiliary passage opening and position it directly below it; the forward stop ring on the left side of the main frame should be pressed against the auxiliary facility wall, and the brakes on the four corner casters at the bottom should be engaged; rotate the lifting handwheel and the lateral handwheel to align the sleeve with the auxiliary facility opening, and adjust the two handwheels to make the vertical and horizontal gaps between the sleeve and the auxiliary facility opening the same; push the sleeve into the auxiliary facility, loosen the butterfly bolt, and remove the upper bushing of the sleeve; rotate the lifting handwheel to lower the lower bushing of the sleeve to a height that does not affect the movement of the sleeve, push the sleeve completely into the auxiliary facility, install the upper bushing of the sleeve, lock the sleeve, flip the flip cover to protect the sleeve; release the caster brakes, push the device to the normal storage position, and engage the caster brakes again. The installation of the auxiliary facility sleeve is now complete.

[0014] The beneficial effects achieved by this invention are as follows: This invention achieves convenient transport and storage of casing by incorporating a caster wheel mechanism, storage drawers, and storage cabinets. It also features horizontal and vertical adjustment mechanisms for effective support and centering adjustment of the casing, solving the problem of manual centering difficulties. Furthermore, the linear guide slider design facilitates smooth pushing and pulling of the casing, making the entire casing assembly and disassembly operation labor-saving, convenient, efficient, and eliminating safety hazards, thus improving operator safety and work efficiency. This invention achieves efficient casing transport, effective support, and adjustable centering, eliminating the physical harm caused by traditional manual labor and avoiding operational safety risks. It simplifies and streamlines the casing assembly and disassembly process, while the added storage function facilitates item storage and reduces the need for frequent tool transfers. This invention is suitable for the operational needs of confined spaces in nuclear power plants. Attached Figure Description

[0015] Figure 1 This is a front view of a bushing disassembly and assembly device for auxiliary facilities of a heavy water reactor nuclear power plant according to the present invention; Figure 2 This is a right view of a bushing disassembly and assembly device for auxiliary facilities of a heavy water reactor nuclear power plant according to the present invention; Figure 3 This is a cross-sectional view of a bushing disassembly and assembly device for auxiliary facilities of a heavy water reactor nuclear power plant according to the present invention; Figure 4 This is a partial rear view of a bushing disassembly and assembly device for auxiliary facilities of a heavy water reactor nuclear power plant according to the present invention; In the diagram: 1. Flip-top ear seat; 2. Flip-top; 3. Upper bushing block of the sleeve; 4. Butterfly bolt; 5. Pressing flip-top buckle plate; 6. Pressing flip-top buckle plate pin bolt; 7. Horizontal movement scale; 8. Guide rail horizontal movement base plate; 9. Lower bushing block of the sleeve; 10. Spring bolt; 11. Bushing pad; 12. Guide rail slider; 13. Linear guide rail; 14. Worm gear mechanism; 15. Slide table slider; 16. Linear slide table; 17. Main frame; 18. Storage. 19. Drawer; 20. Forward retaining ring; 21. Casters; 22. Locker; 23. Lateral sliding bearing seat; 24. Lateral sliding handwheel; 25. Lateral sliding bearing seat pad; 26. Drive shaft; 27. Coupling; 28. Lifting base plate; 29. ​​Handle; 30. Guide column; 31. Lifting handwheel; 32. Lifting sliding sleeve; 33. Moving handle; 34. Lifting scale; 35. Lateral sliding lead screw; 36. Lifting nut; 37. Lateral sliding nut. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a casing disassembly and assembly device for auxiliary facilities of a heavy water reactor nuclear power plant includes a main frame 17, a storage cabinet 21, a storage drawer 18, a linear slide 16, a slide slider 15, a transverse handwheel 23, a transverse bearing seat 22, a transverse lead screw 34, a lifting base plate 27, a worm gear mechanism 14, a guide rail transverse base plate 8, a linear guide rail 13, a guide rail slider 12, a lower casing liner 9, an upper casing liner 3, and a pressing and flipping buckle plate 5. The main frame 17 is welded from 6 horizontally arranged rectangular steel bars, 4 vertically arranged rectangular steel bars, 8 horizontally arranged short rectangular steel bars, and 4 vertically arranged short rectangular steel bars. The bottom, middle, and back of the main frame 17 are welded with directional steel plates to create independent spaces. The upper part has 3 drawers of equal height for storing small items, and the lower part has 5 cabinet doors for storing larger items, including 3 front cabinet doors and 2 doors on each side for easy access. All 3 drawers and 5 cabinet doors are equipped with handles 28. Casters 20 are installed at the four corners of the bottom of the main frame 17 for easy movement. Each caster 20 is equipped with a brake to ensure the main frame 17 is securely fixed to the ground. Two equal-length forward-moving rings 19 are located on the left side of the main frame 17 for propelling it against the wall of the auxiliary facility to determine the center plane. Two moving handles 32 are located on the right side of the main frame 17 for easy transport. Two flip cover lugs 1 are provided on one side of the upper part of the main frame 17 for mounting the trunnion of the flip cover 2.

[0018] Storage drawers 18 are located in the lower part of the main frame 17. The upper part has three storage drawers 18 of equal height. The three storage drawers 18 are independent of each other and are used to place small items. The lower part has five storage cabinets 21. The interior space of the cabinets is interconnected and can store larger items. At the same time, it is convenient to access items from all directions. All cabinet doors are equipped with locks to prevent the cabinet doors from opening automatically.

[0019] Linear slides 16 are installed side by side on short square steel bars arranged transversely in the middle of the main frame 17. Each linear slide 16 is equipped with two slide sliders 15. The slide sliders 15 are connected to the bottom of the lifting base plate 27, so that the lifting base plate 27 can slide on the linear slides 16.

[0020] The transverse bearing seat pad 24 is installed and fixed to the middle rectangular steel of the main frame 17 by welding. The transverse bearing seat 22 is fixed to the transverse bearing seat pad 24 by two bolts. The transverse scale 7 is fixed to the upper surface of the transverse bearing seat by welding to indicate the transverse position of the lifting base plate 27. One end of the transverse lead screw 34 passes through the bearing in the transverse bearing seat 22 and is connected to the transverse handwheel 23. The other end passes through the transverse mounting hole of the lifting base plate 27 and is connected to the transverse nut 36. The transverse nut 36 is installed and fixed to the lifting base plate 27 by four bolts. When the transverse handwheel 23 is rotated, the transverse nut 36 moves the lifting base plate 27 back and forth.

[0021] Four guide posts 29 are provided at the four corners of the lifting base plate 27. The guide posts 29 are designed in a stepped shape, with a larger lower cylinder for limiting the movement and a smaller upper cylinder for guiding. A lifting scale 33 is welded to the lifting base plate 27 near the lifting handwheel 30 to indicate the height of the guide rail transverse base plate 8. One worm gear mechanism 14 is installed at each end of the middle of the lifting base plate 27. The two worm gear mechanisms 14 are connected by a coupling 26 via a drive shaft 25. The lifting handwheel 30 is installed at the input end of the worm gear mechanism 14 on the right side. The output screws of the two worm gear mechanisms 14 pass through the mounting holes of the upper guide rail transverse base plate 8 and are connected to the lifting nut 35. The lifting nut 35 is fixed to the guide rail transverse base plate 8 with four bolts. When the lifting handwheel 30 is rotated, the lifting nut 35 moves the guide rail transverse base plate 8 up and down.

[0022] The guide rail transverse base plate 8 has four guide holes at its four corners. Lifting sleeves 31 are installed in these guide holes, and each lifting sleeve 31 is fixed to the guide rail transverse base plate 8 with four bolts, serving a guiding and wear-resistant function. Four linear guide rails 13 are installed parallel to each other on the guide rail transverse base plate 8. Each pair of linear guide rails 13 forms a group, and each linear guide rail 13 has two guide rail sliders 12 installed on it. Two adjacent guide rail sliders 12 in a group are fixedly connected to the liner plate 11 with bolts, allowing the two guide rail sliders 12 to move synchronously.

[0023] The bushing pad 11 is connected and fixed to the lower bushing 9 of the sleeve by two spring bolts 10, making the gap between the lower bushing 9 and the bushing pad 11 elastically adjustable. On the right side, the two lower bushings 9 are connected by two clamping flip-plate buckles 5 with gap bolts 6, allowing the clamping flip-plate buckles 5 to rotate 360 ​​degrees. The upper part of the clamping flip-plate 5 is designed with an arc-shaped opening, which can cooperate with the butterfly bolt 4. When the upper bushing 3 of the sleeve is stacked on the lower bushing 9, rotating the clamping flip-plate 5 against the upper butterfly bolt 4 and tightening the butterfly bolt 4 connects the upper and lower bushings into a whole to lock the sleeve. This prevents the sleeve from tilting due to its own weight when it is pushed out of the device.

[0024] The flip cover 2 consists of four small square steel bars, a perforated stainless steel plate, and two hinges. The perforated stainless steel plate helps reduce weight and protects the sleeve. The two hinges fit with the two flip cover lugs on the main frame, allowing the flip cover to rotate 270 degrees.

[0025] Removal of the auxiliary facility sleeve: Rotate the flip cover 2 270 degrees to make it hang vertically downwards, loosen the butterfly bolt 4, and remove the upper sleeve liner 3; push the device next to the auxiliary facility, roughly aligning the empty compartment with the auxiliary facility opening, with the forward stop ring 19 pressed against the auxiliary facility wall, and brake the four casters 20; rotate the lifting handwheel 30 to lower the lower sleeve liner 9 to a height below the auxiliary facility opening, without affecting the pulling out of the sleeve; pull the sleeve out of the auxiliary facility for about half its length, rotate the lifting handwheel 30 and the horizontal movement handwheel 23 to raise the lower sleeve liner 9 to a position close to and supporting the sleeve, and adjust the lifting handwheel 30 and the horizontal movement handwheel 23 to make the vertical and horizontal gaps between the sleeve and the auxiliary facility opening approximately the same; pull the sleeve out of the auxiliary facility completely, install the upper sleeve liner 3, lock the sleeve, flip the flip cover 2 to protect the sleeve; release the brakes on the four casters, push the device to the normal storage position, and brake the four brakes again. The removal of the auxiliary facility casing has been completed.

[0026] Installation of the auxiliary facility sleeve: Rotate the flip cover 2 270 degrees to make it hang vertically downwards, move the device to the auxiliary passage opening, and position it approximately directly below it; press the forward stop ring 19 against the auxiliary facility wall and brake the four casters; rotate the lifting handwheel 30 and the lateral handwheel 23 to align the sleeve with the auxiliary facility opening, and adjust the two handwheels to make the vertical and horizontal gaps between the sleeve and the auxiliary facility opening approximately the same; push the sleeve as far into the auxiliary facility as possible, loosen the butterfly bolt 4, and remove the upper sleeve liner 3; rotate the lifting handwheel 30 to lower the lower sleeve liner 3 to a height that does not affect the movement of the sleeve, push the sleeve completely into the auxiliary facility, install the upper sleeve liner 3, lock the sleeve, flip the flip cover 2 to protect the sleeve; release the four caster brakes, push the device to the normal storage position, and brake the four brakes again. The installation of the auxiliary facility sleeve is now complete.

Claims

1. A device for disassembling and assembling bushings for auxiliary facilities in a heavy water reactor nuclear power plant, characterized in that: Two flip-top lugs are installed on one side of the upper part of the main frame, and flip-tops are installed on the lugs. Linear slides are installed side-by-side on short square steel sections arranged transversely in the middle of the main frame. Each linear slide has two slide blocks, which are connected to the bottom of the lifting base plate, allowing the lifting base plate to slide on the linear slides. A transverse bearing seat pad is welded to the long square steel section in the middle of the main frame, and the transverse bearing seat is fixed to the transverse bearing seat pad. A transverse scale is welded to the upper surface of the transverse bearing seat. One end of the transverse lead screw passes through the bearing in the transverse bearing seat and connects to the transverse handwheel; the other end passes through the transverse mounting hole in the lifting base plate and engages with the transverse nut. The connection is made by mounting a horizontal sliding nut to the lifting base plate. When the horizontal sliding handwheel is rotated, the horizontal sliding nut moves the lifting base plate back and forth. Worm gear mechanisms are mounted at both ends of the middle of the lifting base plate, connected by a coupling via a drive shaft. The input end of the right-hand worm gear mechanism is fitted with a lifting handwheel. A lifting scale is welded to the lifting base plate near the lifting handwheel. The output screws of both worm gear mechanisms pass through the mounting holes in the upper guide rail of the horizontal sliding base plate and connect with the lifting nut. The lifting nut is mounted and fixed to the guide rail of the horizontal sliding base plate. When the lifting handwheel is rotated, the lifting base plate moves back and forth. The nut moves the guide rail base plate up and down. Guide holes are provided at the four corners of the guide rail base plate, and lifting sleeves are installed in these holes. The lifting sleeves are fixedly connected to the guide rail base plate. Four linear guide rails are installed parallel to each other on the guide rail base plate, with each pair of linear guide rails forming a group. Each linear guide rail has two guide rail sliders installed on it. Two adjacent guide rail sliders in a group are fixedly connected to the liner pad by bolts, allowing the two guide rail sliders to move synchronously. The liner pad is fixedly connected to the lower liner of the sleeve. Two clamping flip-up buckles are spaced apart on both sides of the two lower liners on the right side. The upper part of the clamping flip-over buckle is designed with an arc-shaped opening, which cooperates with the butterfly bolt. When the upper bushing of the sleeve is stacked on the lower bushing of the sleeve, the clamping flip-over buckle is rotated against the upper butterfly bolt, and the butterfly bolt is tightened to connect the upper and lower bushings into a whole to lock the sleeve. The flip cover is composed of four small square steel bars, a hollow stainless steel plate and two axle lugs. The two axle lugs are fitted with the two flip cover lug seats of the main frame with a clearance, so that the flip cover can rotate 270 degrees. On the right side of the two lower bushings of the sleeve, there are two clamping flip-over buckles connected by clamping flip-over buckle pin bolts with a clearance, so that the clamping flip-over buckles can rotate 360 ​​degrees.

2. The bushing disassembly and assembly device for auxiliary facilities of heavy water reactor nuclear power plants according to claim 1, characterized in that: The main frame is welded together from 6 horizontally arranged rectangular steel bars, 4 longitudinally arranged rectangular steel bars, 8 horizontally arranged short rectangular steel bars, and 4 longitudinally arranged short rectangular steel bars.

3. The bushing disassembly and assembly device for auxiliary facilities of heavy water reactor nuclear power plants according to claim 1, characterized in that: The bottom, middle and back of the main frame are welded steel plates to form independent spaces. Three storage drawers of the same height are arranged in the upper part, and five storage cabinets are set in the lower part. The interior spaces of the cabinets are interconnected, with three cabinet doors in the front and two cabinet doors on the left and right. All three storage drawers and five cabinet doors are equipped with handles.

4. The bushing disassembly and assembly device for auxiliary facilities of heavy water reactor nuclear power plants according to claim 1, characterized in that: The main frame is equipped with casters at the four corners of its bottom, each caster having a brake; there are two moving handles on the right side of the main frame and two equal-length forward stop rings on the left side of the main frame.

5. The bushing disassembly and assembly device for auxiliary facilities of heavy water reactor nuclear power plants according to claim 1, characterized in that: The lifting platform has four guide pillars at its four corners. The guide pillars are designed in the form of steps, with a larger lower cylinder and a smaller upper cylinder.

6. The bushing disassembly and assembly device for auxiliary facilities of heavy water reactor nuclear power plants according to claim 1, characterized in that: The liner pad is connected and fixed to the lower liner of the sleeve by two spring bolts, so that the gap between the lower liner of the sleeve and the liner pad is elastically adjustable.

7. A method for disassembling and assembling bushings of auxiliary facilities in a heavy water reactor nuclear power plant, characterized in that: Removing the auxiliary facility sleeve: Rotate the flip cover 270 degrees to make it hang vertically downwards, loosen the butterfly bolts, and remove the upper bushing of the sleeve; push the device next to the auxiliary facility, aligning the empty compartment with the auxiliary facility opening, with the forward stop ring on the left side of the main frame pressed against the auxiliary facility wall, and brake the universal wheels installed at the four corners of the bottom of the main frame; rotate the lifting handwheel to lower the lower bushing of the sleeve to a height lower than the auxiliary facility opening, without affecting the pulling out of the sleeve; pull the sleeve out half its length from the auxiliary facility, rotate the lifting handwheel and the horizontal movement handwheel to raise the lower bushing of the sleeve to a position that fits against the sleeve and supports it, and adjust the lifting handwheel and the horizontal movement handwheel to make the vertical and horizontal clearances between the sleeve and the auxiliary facility opening the same; pull the sleeve out completely from the auxiliary facility, install the upper bushing of the sleeve, lock the sleeve, flip the flip cover to protect the sleeve; release the brakes on the universal wheels, push the device to the normal storage position, and brake the universal wheels again. The removal of the auxiliary facility sleeve is now complete.

8. A method for disassembling and assembling bushings of auxiliary facilities in a heavy water reactor nuclear power plant, characterized in that: Install the auxiliary facility sleeve: Rotate the flip cover 270 degrees to make it hang vertically downwards, move the device to the auxiliary passage opening and position it directly below it; the forward stop ring on the left side of the main frame should be pressed against the auxiliary facility wall, and the brakes on the four corner casters at the bottom should be engaged; rotate the lifting handwheel and the lateral handwheel to align the sleeve with the auxiliary facility opening, and adjust the two handwheels to make the vertical and horizontal gaps between the sleeve and the auxiliary facility opening the same; push the sleeve into the auxiliary facility, loosen the butterfly bolt, and remove the upper bushing of the sleeve; rotate the lifting handwheel to lower the lower bushing of the sleeve to a height that does not affect the movement of the sleeve, push the sleeve completely into the auxiliary facility, install the upper bushing of the sleeve, lock the sleeve, flip the flip cover to protect the sleeve; release the caster brakes, push the device to the normal storage position, and engage the caster brakes again. The installation of the auxiliary facility sleeve is now complete.

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