Control rod guide barrel upper assembly removal and threaded hole repair device and method of use

Abstract

The application provides a control rod guide tube upper assembly dismounting and threaded hole repairing device and a use method in the field of nuclear reactor equipment production and processing, which comprises a to-be-processed guide tube assembly, a bolt dismounting and processing assembly, a threaded hole repairing and processing assembly and a positioning and fixing and work station switching assembly, the positioning and fixing and work station switching assembly is arranged on the to-be-processed guide tube assembly, the bolt dismounting and processing assembly and the threaded hole repairing and processing assembly are arranged on the positioning and fixing and work station switching assembly through a Z-axis module installation support; the bolt dismounting and processing assembly removes the fastening bolt and the bolt locking cap through electric spark rotary grinding, and the threaded hole repairing and processing assembly performs electric spark threaded hole repairing and processing and removes the residual bolt in the threaded hole. The application solves the problems of the prior art, such as difficult guide tube dismounting, inability to perform threaded hole repairing, great harm of manual dismounting and low work efficiency due to the complexity of the scene, the density of the guide tube and the narrow work space.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear reactor equipment production and processing technology, in particular, to a control rod guide tube upper assembly dismounting and threaded hole repairing device and use method, mainly applied to the overall dismounting of the control rod guide tube upper assembly during the overhaul of the pressurized water reactor and the synchronous online repairing work of the threaded hole installed on the upper support assembly. BACKGROUND

[0002] Nuclear power as a clean and efficient energy, while meeting the demand for electricity, but also to protect the country's energy security. In recent years, the country has continued to vigorously develop nuclear power industry, accelerate the construction of nuclear power. At present, the pressurized water reactor is widely used in nuclear power plants in various countries, and the in-vessel component is a key component of the pressurized water reactor, and ensuring its safety and reliability is the primary task. Among them, the control rod guide tube provides protection, positioning and guiding effect for the movement of the control rod assembly, so it becomes one of the important core components.

[0003] The upper in-vessel component of the pressurized water reactor nuclear power plant is installed with dozens of upper and lower control rod guide tube assemblies, each upper and lower guide tube is fixed with the upper support assembly through the upper flange, the middle flange and four fastening bolts, and the lower guide tube is positioned through the interference fit of the two open support pins on the bottom flange with the pin hole on the upper core plate. During the maintenance of the pressurized water reactor internal assembly, after the fastening bolts on the guide tube upper flange and middle flange are removed, the threaded hole of the upper support assembly needs to be repaired and processed. However, due to the strong radiation environment of the nuclear reactor, manual operation is not possible, and the fixed fastening bolts of the guide tube upper assembly and the upper support assembly are rusty, dead, welded, etc., the working environment is complex, the working space is narrow, the bolt dismounting is difficult, and after the dismounting, the threaded hole repairing work is complex, etc.

[0004] Through prior art retrieval, it is found that the Chinese utility model patent with the publication number CN206416122U discloses an auxiliary guide tool for disassembling an upper in-core component control rod guide cylinder, specifically comprising an adapter cap installed at the top of the upper guide cylinder, a guide limiting sleeve uniformly distributed on the outer edge of the upper end of the adapter cap and connected with a fixed support, and the fixed support is located at the corresponding position of the upper end surface of the adapter cap and the guide limiting sleeve and is fixedly connected with the adapter cap through a support screw. However, the above patent has the following deficiencies: the device mainly provides an auxiliary guide tool for remotely disassembling the fastening bolt in the middle flange of the upper and lower guide cylinders, and finally the bolt is mechanically removed by applying torque through a torque wrench, but the thread hole thread of the fastening bolt installed in the middle flange of the upper and lower guide cylinders after disassembly is not repaired. Moreover, since the working environment of the control rod guide cylinder is in an acidic environment, the fastening bolt may be damaged, stuck and the like, and the traditional mechanical method cannot be used for disassembly. At the same time, even if special means is used for disassembly, the thread of the damaged thread hole must be repaired, otherwise the upper assembly of the guide cylinder cannot be reassembled and used, and even if it is forced to be reassembled, it will bring hidden dangers to the use after maintenance and bring greater difficulty to the later maintenance.

[0005] Therefore, the present application provides a control rod guide cylinder upper assembly disassembly and thread hole repair device and a use method, so as to solve the problems of difficult disassembly and repair of the control rod guide cylinder upper assembly in a radiation environment and low maintenance efficiency. SUMMARY

[0006] In view of the defects in the prior art, the present application aims to provide a control rod guide cylinder upper assembly disassembly and thread hole repair device and a use method.

[0007] According to the control rod guide cylinder upper assembly disassembly and thread hole repair device provided by the present application, the disassembly and repair of the control rod guide cylinder upper assembly in a radiation environment are facilitated, and the maintenance efficiency is improved.

[0008] The guide cylinder assembly to be processed comprises an upper support assembly and an upper cylinder body, the positioning and fixing and station switching assembly comprises a work rotary table and a support assembly providing support and guide functions, the upper cylinder body is fixedly arranged on the upper support assembly, the support assembly is arranged on the upper cylinder body, and the work rotary table is fixedly arranged on the support assembly.

[0009] In some embodiments, the guide cylinder assembly to be processed further comprises a middle flange and a cover plate, the middle flange is arranged on the upper support assembly, an upper flange is arranged on the middle flange, the fastening bolts are connected to the threaded holes on the upper support assembly through the through holes of the upper flange and the middle flange in sequence, the fastening bolts and the bolt locking caps are arranged by welding, the upper cylinder body is fixedly arranged on the upper flange, and the cover plate is arranged on the upper cylinder body.

[0010] In some embodiments, the positioning and fixing and station switching assembly further comprises a turnover motor, a bearing part and a fixed gear plate, the work rotary table is provided with a bearing mounting hole, the outer ring of the bearing part is arranged and fixed corresponding to the bearing mounting hole, the middle shaft of the fixed gear plate is arranged in the cover plate, the upper end of the middle shaft is arranged on the inner ring of the bearing part, the turnover motor is arranged on the work rotary table, and a turnover gear is arranged and fixed on the rotating shaft of the turnover motor.

[0011] In some embodiments, the positioning and fixing and station switching assembly further comprises a camera and a guide, and the camera and the guide are arranged on the support assembly respectively.

[0012] In some embodiments, the bolt removal processing assembly comprises a Z-axis linear module, the Z-axis linear module is arranged on the Z-axis module mounting bracket, the driving motor comprises a Z-axis motor and a C-axis motor, the Z-axis motor is arranged on the Z-axis linear module, the Z-axis linear module is provided with a sliding block, a work module mounting platform is fixedly arranged on the sliding block, the Z-axis motor drives the work module mounting platform fixedly connected with the sliding block to move along the Z-axis direction through the Z-axis linear module, the work module platform is arranged on the work module mounting platform, and the C-axis motor is arranged on the work module platform.

[0013] In some embodiments, the bolt removal machining assembly further comprises a removal motor and a Z control guide rod, one end of the Z control guide rod is correspondingly arranged below the tool holder, and the Z control guide rod is guided to the upper support assembly through the inside of the support module, the guide is mounted on the Z control guide rod, and a removal motor is arranged at the lower end of the Z control guide rod, the Z-axis motor and the C-axis motor drive the removal electrode to move along the Z-axis and rotate around the C-axis respectively through the Z control guide rod.

[0014] In some embodiments, the bolt removal machining assembly and the thread repair machining assembly are arranged at intervals of 180°, the thread repair machining assembly comprises a Z-axis linear module, a thread repair electrode and a Z control guide rod, the Z-axis linear module is arranged on the Z-axis module mounting bracket, the driving motor comprises a Z-axis motor and a C-axis motor, the Z-axis motor is arranged on the Z-axis linear module, and a sliding block is arranged on the Z-axis linear module, a working module mounting platform is fixedly arranged on the sliding block, the Z-axis motor drives the working module mounting platform fixedly connected with the sliding block to move along the Z-axis direction through the Z-axis linear module, a working module platform is arranged on the working module mounting platform, the C-axis motor is arranged on the working module platform, one end of the Z control guide rod is correspondingly arranged below the tool holder, and the Z control guide rod is guided to the upper support assembly through the inside of the support module.

[0015] The thread repair electrode is arranged at the lower end of the Z control guide rod, the C-axis motor drives the thread repair electrode to servo rotate, and the Z-axis motor drives the thread repair electrode to servo feed along the fastening bolt axis direction.

[0016] In some embodiments, the machining guide cylinder assembly further comprises a thermocouple guide tube assembly, and the thermocouple guide tube assembly is mounted on the upper support assembly.

[0017] The application also provides a use method of the control rod guide cylinder upper assembly removal and thread hole repair device, comprising the following steps:

[0018] S1: the whole device is driven by an external mechanical device to reach the vicinity of the control rod guide cylinder mounting position, and the week motor, the Z-axis linear module and the C-axis motor are first operated to move to the reference point;

[0019] S2: through the pose adjustment of the external device, first insert the shaft of the fixed gear plate into the center circular hole of the upper cylinder body to realize hole positioning;

[0020] S3: through the pose adjustment of the external device, rotate the phase finder in the circumferential direction until the anti-rotation rod mounted on the cover plate is inserted into the positioning hole in the fixed gear plate.

[0021] S4: By adjusting the position of the external device, the bottom surface of the fixed gear disk of the device is made to be flush with the upper surface of the cover plate. When the movement is in place, the annular groove on the fixed gear disk should lock the outer cylindrical surface of the upper cylinder.

[0022] S5: The rotary motor operates, and the Z-axis motor and C-axis motor first complete the motion operation to return to the reference point, which serves as the reference for subsequent motion.

[0023] S6: Use the bolt removal processing module to remove the bolts, and use the thread repair processing module to repair the threads;

[0024] S7: The two sets of Z-axis motors and the C-axis motor complete the motion operation to return to the reference point, preventing motion interference and collisions.

[0025] S8: The turnover motor drives the turnover gear to rotate, thereby moving the work turntable and the work module installed on the work turntable to the next working position;

[0026] S9: Repeat steps S6-S8 until all fasteners that need to be processed have been processed;

[0027] S10: Using external equipment, transport the device to the next control rod guide tube to be processed and repeat the steps of this work process, or complete all processing tasks and evacuate the pressurized water reactor to await subsequent operations.

[0028] In some implementations, step 6 includes a step of simultaneously removing the fastening bolts from two different holes and then repairing the threads, specifically including the following operations:

[0029] S6.1: When removing the fastening bolt using the bolt removal processing module, the Z-axis motor and the C-axis motor drive the removal electrode to rotate at high speed along the C-axis direction and to be linearly servo-fed along the Z-axis direction via the Z-control guide rod. The fastening bolt is removed by electrical discharge rotary grinding until only residual bolts remain.

[0030] S6.2: When repairing threads using the thread repair processing module, the Z-axis motor and the C-axis motor drive the thread repair electrode to rotate and servo feed along the C-axis direction and linearly feed along the Z-axis direction through the Z-control guide rod. The Z-axis motor and the C-axis motor cooperate with the spiral servo feed to process and remove the residual bolts, while repairing the threads of the threaded hole.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The application realizes positioning and fixing through the cooperation of the air expansion shaft, the circular ring sliding groove, the phase searching positioning hole and the center hole on the cover plate, and the anti-rotation rod on the fixed gear plate, realizes work station switching through the fixed gear plate, the fixed gear disc and the rotating gear on the positioning and fixing and work station switching module, one positioning, multiple processing, reduces the error of repeated positioning, improves the work efficiency, realizes the multi-station processing of bolt removal and thread repair through two groups of processing modules, thereby solving the problems of difficult removal of the guide cylinder, low processing efficiency, low processing automation and low processing precision of other methods.

[0033] 2. The application realizes in-situ positioning and fixing of the guide cylinder through the cooperation of the hole shaft between the fixed gear plate and the cover plate, solves the problem of in-situ positioning, and through the two groups of processing modules arranged at intervals of 180°, can realize simultaneous processing of double stations when necessary, thereby increasing the processing efficiency.

[0034] 3. The application realizes one positioning, multiple hole position processing through the rotating gear and the fixed gear plate, solves the problems of difficult bolt removal and thread repair caused by the narrow working space and the excessive length of the upper part of the guide cylinder through the electric spark processing method of Z control guide rod, support assembly, guide and the like, realizes automatic processing through real-time observation of the processing condition by the camera, guarantees the safety of the maintenance personnel, and improves the work efficiency and reliability.

[0035] 4. The application realizes the feeding of the electrode along the bolt axis direction during processing through the movement of the Z-axis linear module, the components mounted thereon and the Z control guide rod, the electrode is installed on the Z control guide rod, the feeding direction is adjusted through the guide, the bending and shaking caused by the excessive length of the Z control guide rod is controlled, and under the driving of the Z-axis motor and the C-axis motor, the electric spark removes the fastening bolt and forms the thread repair through the electric spark feeding. BRIEF DESCRIPTION OF DRAWINGS

[0036] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0037] Figure 1 It is a structural schematic view of the control rod guide cylinder upper assembly removal and thread hole repair device of the application.

[0038] Figure 2 It is an exploded structural schematic view of the positioning and fixing and work station switching module involved in the control rod guide cylinder upper assembly removal and thread hole repair device of the application.

[0039] Figure 3 It is a schematic view of the electric spark removal fastening bolt and electric spark inner hole thread repair processing mode involved in the control rod guide cylinder upper assembly removal and thread hole repair device of the application.

[0040] Reference signs:

[0041] DETAILED DESCRIPTION

[0042] The application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the application. These are within the scope of protection of the application.

[0043] As Figure 1 The structure of the device for dismounting and repairing threaded holes of the upper assembly of the control rod guide tube is shown in the figure, which includes a guide tube assembly to be processed, a bolt dismounting and processing assembly, a threaded hole repairing and processing assembly, and a positioning and fixing and work station switching assembly. The positioning and fixing and work station switching assembly is arranged on the guide tube assembly to be processed, and the bolt dismounting and processing assembly and the threaded hole repairing and processing assembly are arranged on the positioning and fixing and work station switching assembly through the Z-axis module installation support 13.

[0044] The guide tube assembly to be processed includes an upper support assembly 1 and an upper tube body 9, and the positioning and fixing and work station switching assembly includes a work turntable 10 and a support assembly 8 providing support and guide functions. The upper tube body 9 is fixedly arranged on the upper support assembly 8, the support assembly 8 is arranged on the upper tube body 9, and the work turntable 10 is fixedly arranged on the support assembly 8. The support assembly 8 provides support and guide functions for the bolt dismounting and processing module and the threaded hole repairing and processing module, relieves the vibration and bending caused by the excessively long Z control guide rod 12, and reduces the error in the processing process. The guide tube assembly to be processed also includes a thermocouple guide tube assembly 2, which is installed on the upper support assembly 1. A large number of upper support assemblies 1 are installed in the actual nuclear reactor, and the guide tube assemblies are precisely arranged. The thermocouple guide tube assemblies 2 are precisely arranged between the guide tubes, and the space is narrow.

[0045] The bolt dismounting and processing assembly and the threaded hole repairing and processing assembly each include a work module platform 14, which is arranged on the Z-axis module installation support 13. The work module platform 14 is provided with a driving motor and a tool shank 20. The bolt dismounting and processing assembly removes the fastening bolt 28 and the bolt locking cap 5 through electric spark rotary grinding by the driving motor. The threaded hole repairing and processing assembly performs electric spark threaded hole repairing and processing and removes the residual bolt 29 remaining in the threaded hole by the driving motor.

[0046] The guide cylinder assembly to be processed further comprises a middle flange 3 and a cover plate 26, the middle flange 3 is installed on the upper support assembly 1, the upper flange 4 is installed on the middle flange 3, the fastening bolt 28 is connected with the threaded hole on the upper support assembly 1 through the through hole of the upper flange 4 and the middle flange 3 in sequence, the fastening bolt 28 is welded with the bolt locking cap 5 to prevent the fastening bolt 28 from loosening with the bolt locking cap 5, the upper cylinder body 9 is fixedly arranged on the upper flange 4, and the cover plate 26 is installed on the upper cylinder body 9. The cover plate 26 is provided with an anti-rotation rod 27, and the anti-rotation rod 27 penetrates the upper cylinder body 9.

[0047] The positioning and fixing and work station switching assembly further comprises a turnover motor 11, a bearing member 23 and a fixed gear plate 24. The work turntable 10 is provided with a bearing mounting hole, the outer ring of the bearing member 23 is arranged correspondingly, the middle shaft of the fixed gear plate 24 is arranged in the cover plate 26, the upper end of the middle shaft is arranged on the inner ring of the bearing member 23, the turnover motor 11 is arranged on the work turntable 10, and the turnover gear 25 is arranged on the rotating shaft of the turnover motor 11. The positioning and fixing and work station switching assembly further comprises a camera 7 and a guide 21, and the camera 7 and the guide 21 are arranged on the support assembly 8 respectively.

[0048] The bolt removal processing assembly comprises a Z-axis linear module 17, the Z-axis linear module 17 is arranged on the Z-axis module mounting bracket 13, the driving motor comprises a Z-axis motor 16 and a C-axis motor 15, the Z-axis motor 16 is arranged on the Z-axis linear module 17, the Z-axis linear module 17 is provided with a sliding block 18, the working module mounting platform 19 is fixedly arranged on the sliding block 18, the Z-axis motor 16 drives the working module mounting platform 19 fixedly connected with the sliding block 18 to move along the Z-axis direction through the Z-axis linear module 17, the working module platform 14 is arranged on the working module mounting platform 19, and the C-axis motor 15 is arranged on the working module platform 14.

[0049] The bolt removal processing assembly further comprises a removal motor and a Z control guide rod 12, one end of the Z control guide rod 12 is arranged below the tool shank 20, the Z control guide rod 12 reaches the upper support assembly 1 through the internal guide of the support module, the guide 21 is arranged on the Z control guide rod 12, the Z control guide rod 12 is provided with the removal motor at the lower end, and the Z-axis motor 16 and the C-axis motor 15 drive the removal electrode 6 to move along the Z-axis and rotate around the C-axis respectively through the Z control guide rod 12.

[0050] The threaded repair processing assembly comprises a Z-axis linear module 17, a threaded repair electrode, and a Z-control guide rod 12. The Z-axis linear module 17 is arranged on a Z-axis module mounting support 13. The driving motor comprises a Z-axis motor 16 and a C-axis motor 15. The Z-axis motor 16 is arranged on the Z-axis linear module 17. The Z-axis linear module 17 is provided with a sliding block 18. The sliding block 18 is fixedly provided with a working module mounting platform 19. The Z-axis motor 16 drives the working module mounting platform 19 fixedly connected with the sliding block 18 to move along the Z-axis direction.

[0051] The working module platform 14 is arranged on the working module mounting platform 19. The C-axis motor 15 is arranged on the working module platform 14. One end of the Z-control guide rod 12 is arranged below the tool shank 20 in correspondence. The Z-control guide rod 12 reaches the upper support assembly 1 through the internal guidance of the support module. The threaded repair electrode is arranged at the lower end of the Z-control guide rod 12. The C-axis motor 15 drives the threaded repair electrode 22 to servo-rotate. The Z-axis motor 16 drives the threaded repair electrode 22 to servo-feed along the axis direction of the fastening bolt 28. The two servo motors are cooperated to realize the screw servo feeding. The electric spark threaded repair processing is performed. The residual bolt 29 remaining in the threaded hole is removed. The threads of the threaded hole are repaired.

[0052] As shown in Figure 2 The exploded structural schematic diagram of the positioning and fixing and station switching module involved in the control rod guide cylinder upper assembly dismounting and threaded hole repairing device is shown in Figure 3 The electric spark dismounting fastening bolt 28 and electric spark inner hole threaded repair processing mode schematic diagram involved in the control rod guide cylinder upper assembly dismounting and threaded hole repairing device is shown in Figure 3 The movement directions of the dismounting electrode 6 and the threaded repair electrode 22 are marked. The solid arrows are the movement directions. The letter labels are used to distinguish the movement axes. The use method of the control rod guide cylinder upper assembly dismounting and threaded hole repairing device comprises the following steps:

[0053] S1: The whole device is driven by an external mechanical device (such as a manipulator) to reach the vicinity of the control rod guide cylinder installation position. The week motor 11, the Z-axis linear module 17, and the C-axis motor 15 are first operated to move back to the reference point.

[0054] S2: Through the pose adjustment of the external device, the shaft of the fixed gear plate 24 is first inserted into the center hole of the upper cylinder 9 to realize the hole positioning. The shaft of the fixed gear plate 24 is inflated through the air inflation function to realize the positioning and fixing of the whole device.

[0055] S3: The phase is rotated in the circumferential direction through the pose adjustment of the external device until the anti-rotation rod 27 mounted on the cover plate 26 is inserted into the positioning hole in the fixed gear plate 24.

[0056] S4: Through the pose adjustment of the external device, the bottom surface of the fixed gear plate 24 of the device is attached to the upper surface of the cover plate 26. When moved to the position, the circular slot on the fixed gear plate 24 should be clamped on the outer cylindrical surface of the upper cylinder 9, so as to realize the positioning and fixing of the whole device;

[0057] S5: The Z-axis motor 16 and the C-axis motor 15 complete the movement operation back to the reference point as the subsequent movement reference.

[0058] S6: The bolt removal processing module removes the bolt, and the thread repair processing module repairs the thread.

[0059] S7: When switching the workstations, the two groups of Z-axis motors 16 and C-axis motors 15 complete the movement operation back to the reference point, and the two groups of Z-axis linear modules 17 drive the two Z control guide rods 12 to move to the specified position to prevent movement interference and collision.

[0060] S8: The rotation motor 11 drives the rotation gear 25 to rotate, realizes the rotation of the worktable 10 relative to the fixed gear plate 24, and drives the worktable 10 and the work module installed on the worktable 10 to move to the next working position, so as to realize the switching of the processing workstations.

[0061] S9: Repeat steps S6-S8 until all the fastening bolts 28 to be processed are processed.

[0062] S10: Through the external device, the device is transported to the next control rod guide cylinder to be processed to repeat the working process steps, or after completing the entire processing task, it is withdrawn from the pressurized water reactor to wait for subsequent operation.

[0063] In step 6, two different hole positions are synchronized, the fastening bolt 28 is removed first, and then the thread is repaired. The specific operations include the following:

[0064] S6.1: When the bolt removal processing module removes the fastening bolt 28, the Z-axis motor 16 and the C-axis motor 15 drive the removal electrode 6 to rotate at high speed along the C-axis direction and to linear servo feed along the Z-axis direction through the Z control guide rod 12, and remove the fastening bolt 28 through electric spark rotary grinding until only the residual bolt 29 is left.

[0065] S6.2: When the thread repair processing module repairs the thread, the Z-axis motor 16 and the C-axis motor 15 drive the thread repair electrode 22 to rotate servo feed along the C-axis direction and linear servo feed along the Z-axis direction through the Z control guide rod 12. The Z-axis motor 16 and the C-axis motor 15 cooperate with the spiral servo feed processing to remove the residual bolt 29 and repair the thread of the threaded hole at the same time.

[0066] The processing environment of the device is a weak boric acid environment immersed by the control rod guide tube, so the thread repairing electric spark discharge machining part can be immersed in the working liquid, and the weak boric acid water is directly used as the dielectric of the electric discharge machining, so that the pollution of the additional dielectric to the working environment is avoided.

[0067] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0068] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various changes or modifications can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other without conflict.

Claims

1. A device for control rod guide thimble upper assembly removal and thread hole repair, characterized by, Including the guide cylinder assembly to be processed, bolt removal processing assembly, thread repair processing assembly and positioning and work station switching assembly, the positioning and work station switching assembly is arranged on the guide cylinder assembly to be processed, the bolt removal processing assembly and the thread repair processing assembly are arranged on the positioning and work station switching assembly through Z axis module installation support (13); The guide cylinder assembly to be processed includes upper support assembly (1) and upper cylinder (9), the positioning and work station switching assembly includes work turntable (10) and support assembly (8) providing support and guiding function, the upper cylinder (9) is fixedly arranged on the support assembly (8), the support assembly (8) is arranged on the upper cylinder (9), the work turntable (10) is fixedly arranged on the support assembly (8), the bolt removal processing assembly and the thread repair processing assembly respectively include work module platform (14), the work module platform (14) is arranged on the Z axis module installation support (13), the work module platform (14) is provided with driving motor and tool holder (20), the bolt removal processing assembly removes fastening bolt (28) and bolt locking cap (5) through driving motor electric spark rotary grinding, the thread repair processing assembly removes residual bolt (29) in residual thread hole through driving motor electric spark thread repair processing.

2. The device of claim 1, wherein, The guide cylinder assembly to be processed further includes middle flange (3) and cover plate (26), the middle flange (3) is installed on the upper support assembly (1), the upper flange (4) is installed on the middle flange (3), the fastening bolt (28) is connected with the threaded hole on the upper support assembly (1) through the through hole of the upper flange (4) and the middle flange (3) in sequence, the fastening bolt (28) is welded with the bolt locking cap (5), the upper cylinder (9) is fixedly arranged on the upper flange (4), the cover plate (26) is installed on the upper cylinder (9), the cover plate (26) is provided with anti-rotation rod (27), and the anti-rotation rod (27) penetrates the upper cylinder (9) and is arranged.

3. The RCAP disassembly and thread hole repair device of claim 2, wherein, The positioning and work station switching assembly further includes a turnover motor (11), a bearing member (23), and a fixed gear plate (24), the work turntable (10) is provided with a bearing mounting hole, the outer ring of the bearing member (23) is arranged correspondingly, the lower end of the middle shaft of the fixed gear plate (24) is arranged in the cover plate (26), the upper end of the middle shaft is arranged on the inner ring of the bearing member (23), the turnover motor (11) is arranged on the work turntable (10), and the turnover gear (25) is arranged on the rotating shaft of the turnover motor (11).

4. The RCAP disassembly and thread hole repair device of claim 3, wherein, The positioning and work station switching assembly further includes a camera (7) and a guide (21), the camera (7) and the guide (21) are respectively arranged on the support assembly (8).

5. The RCAP disassembly and thread hole repair device of claim 4, wherein, The bolt removal processing assembly comprises a Z-axis linear module (17) arranged on the Z-axis module mounting bracket (13), the driving motor comprises a Z-axis motor (16) and a C-axis motor (15), the Z-axis motor (16) is arranged on the Z-axis linear module (17), and a sliding block (18) is arranged on the Z-axis linear module (17); a work module mounting platform (19) is fixedly arranged on the sliding block (18); the Z-axis motor (16) drives the work module mounting platform (19) fixedly connected with the sliding block (18) to move along the Z-axis direction through the Z-axis linear module (17); the work module platform (14) is arranged on the work module mounting platform (19); and the C-axis motor (15) is arranged on the work module platform (14).

6. The RCAP disassembly and thread hole repair device of claim 5, wherein, The bolt removal processing assembly further comprises a removal motor and a Z control guide rod (12), one end of the Z control guide rod (12) is arranged below the tool shank (20) in a corresponding manner, the Z control guide rod (12) reaches the upper supporting assembly (1) through internal guidance of a supporting module, a guide (21) is arranged on the Z control guide rod (12), and a removal motor is arranged at the lower end of the Z control guide rod (12); the Z-axis motor (16) and the C-axis motor (15) drive the removal electrode (6) to move along the Z-axis and rotate around the C-axis respectively through the Z control guide rod (12).

7. The RCAP disassembly and thread hole repair device of claim 5, wherein, The bolt removal processing assembly and the thread repair processing assembly are arranged at intervals of 180°, the thread repair processing assembly comprises a Z-axis linear module (17), a thread repair electrode and a Z control guide rod (12), the Z-axis linear module (17) is arranged on the Z-axis module mounting bracket (13), the driving motor comprises a Z-axis motor (16) and a C-axis motor (15), the Z-axis motor (16) is arranged on the Z-axis linear module (17), and a sliding block (18) is arranged on the Z-axis linear module (17); a work module mounting platform (19) is fixedly arranged on the sliding block (18); the Z-axis motor (16) drives the work module mounting platform (19) fixedly connected with the sliding block (18) to move along the Z-axis direction through the Z-axis linear module (17); the work module platform (14) is arranged on the work module mounting platform (19); and the C-axis motor (15) is arranged on the work module platform (14). The thread repair electrode is arranged at the lower end of the Z control guide rod (12), the C-axis motor (15) drives the thread repair electrode (22) to rotate in a servo mode, and the Z-axis motor (16) drives the thread repair electrode (22) to feed along the axis direction of the fastening bolt (28) in a servo mode.

8. The RCAP disassembly and thread hole repair device of claim 2, wherein, The guide cylinder assembly to be processed further comprises a thermocouple guide tube assembly (2) mounted on the upper support assembly (1).

9. A method of using a control rod guide barrel upper assembly disassembly and thread hole repair device according to claim 6 or claim 7, characterized in that, The method comprises the following steps: S1: The whole device is driven by an external mechanical device to reach the vicinity of the control rod guide cylinder installation position, and the peripheral motor (11), Z-axis linear module (17) and C-axis motor (15) are first operated to return to the reference point; S2: Through the pose adjustment of the external device, the shaft of the fixed gear plate (24) is first inserted into the center hole of the upper cylinder (9) to realize hole positioning; S3: Through the pose adjustment of the external device, the phase is rotated in the circumferential direction until the anti-rotation rod (27) installed on the cover plate (26) is inserted into the positioning hole on the fixed gear plate (24); S4: Through the pose adjustment of the external device, the bottom surface of the fixed gear plate (24) of the device is attached to the upper surface of the cover plate (26), and when it moves to the position, the circular clamping groove on the fixed gear plate (24) should clamp the outer cylindrical surface of the upper cylinder (9); S5: The peripheral motor (11) works, and the Z-axis motor (16) and the C-axis motor (15) first complete the movement operation to return to the reference point as the subsequent movement reference; S6: The bolt removal processing assembly is used to remove the bolt, and the thread repair processing assembly is used to repair the thread; S7: The two groups of Z-axis motor (16) and C-axis motor (15) complete the movement operation to return to the reference point to prevent movement interference and collision S8: The peripheral motor (11) drives the peripheral gear (25) to rotate, thereby driving the work turntable (10) and the work module installed on the work turntable (10) to move to the next work position; S9: Repeat steps S6-S8 until all the fastening bolts (28) that need to be processed are processed; S10: Through the external device, the device is transported to the next control rod guide cylinder to be processed to repeat the working process steps, or after completing the entire processing task, it is withdrawn from the pressurized water reactor and waits for subsequent operation.

10. The method of claim 9, wherein: In step 6, two different hole positions are synchronized, the fastening bolt (28) is removed first, and then the thread is repaired, which specifically includes the following operations: S6.1: When the bolt removal processing assembly removes the fastening bolt (28), the Z-axis motor (16) and the C-axis motor (15) drive the removal electrode (6) to rotate at high speed along the C-axis direction and to servo feed linearly along the Z-axis direction through the Z control guide rod (12), and the fastening bolt (28) is removed by electric spark rotary grinding until only the residual bolt (29) is left; S6.2: When the thread repair processing assembly repairs the thread, the Z-axis motor (16) and the C-axis motor (15) drive the thread repair electrode (22) to rotate servo feed along the C-axis direction and servo feed linearly along the Z-axis direction through the Z control guide rod (12), and the Z-axis motor (16) and the C-axis motor (15) cooperate with the spiral servo feed processing to remove the residual bolt (29) and repair the thread of the thread hole at the same time.

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