Special wrench system for fastening flange bolt in limited space of nuclear power plant

Abstract

The invention discloses a special wrench system for fastening flange bolts in a limited space of a nuclear power plant. The special wrench system comprises a hydraulic oil tank, a mechanical hydraulic pump, a variable torque device, an electric torque wrench and a hydraulic wrench, the hydraulic oil tank comprises a support, a hydraulic cylinder, a sleeve, a plug connector, a counter-force arm and an interface assembly. The sleeve is used for being connected to a nut of a flange bolt in a sleeving mode, a connecting part is arranged on the outer side face of the sleeve and located in the support, a first through hole is formed in the connecting part, a driving part is arranged at the end of a driving rod of the hydraulic cylinder, a second through hole is formed in the driving part, and the connector clip is connected with the support, the first through hole and the second through hole. At least partial structure of the lower surface of the sleeve is provided with a notch; the counter-force arm is rotatably installed on the support and located on one side of the sleeve. And the interface assembly is connected with the hydraulic cylinder and the hydraulic oil tank. The problems of flange bolt fastening and torque value verification in a limited space of a nuclear power plant can be solved, hidden dangers of bolt looseness and valve cover leakage can be effectively eliminated, and stable operation of nuclear power equipment is ensured.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and in particular to a special wrench system for tightening flange bolts in confined spaces of nuclear power plants. Background Technology

[0002] After long-term operation, the valve cover bolts and nuts of critical gate valve systems in nuclear islands may loosen, leading to asymmetrical bolt torque values ​​on the flanges and potentially causing leaks in the valve cover. To reduce the likelihood of such incidents, the torque values ​​of the valve cover bolts and nuts need to be checked regularly to ensure no leaks occur during operation. In related technologies, during field verification of flange bolt torque in electric gate valves, it was found that due to obstructions from packing glands, limit switches, and surrounding supports, 4-6 bolts on each valve could not be torque-checked or tightened. These confined space conditions could not be altered or optimized. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a special wrench system for tightening flange bolts in confined spaces of nuclear power plants, addressing the shortcomings of related technologies.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to construct a special wrench system for tightening flange bolts in confined spaces of nuclear power plants, including a hydraulic oil tank, a mechanical hydraulic pump, a torque converter, an electric torque wrench, and a hydraulic wrench; The mechanical hydraulic pump is installed on the hydraulic oil tank and has a drive device. The torque converter is installed on the hydraulic oil tank and connected to the drive device. The electric torque wrench is connected to the torque converter to output torque to the mechanical hydraulic pump through the torque converter, thereby supplying hydraulic oil to the hydraulic wrench. The hydraulic oil tank includes a bracket, a hydraulic cylinder, a sleeve, a connector, a reaction arm, and an interface assembly; The sleeve is used to fit onto the nut of the flange bolt. The outer side of the sleeve is provided with a connecting part, which is located in the bracket. The connecting part is provided with a first through hole. The end of the drive rod of the hydraulic cylinder is provided with a drive part, which is provided with a second through hole. The plug-in connects the bracket, the first through hole, and the second through hole. At least a portion of the structure on the lower surface of the sleeve is provided with a notch. The reaction arm is rotatably mounted on the bracket and is located on one side of the sleeve; the interface assembly is connected to the hydraulic cylinder and the interface assembly is connected to the hydraulic oil tank.

[0005] In some embodiments, the hydraulic oil tank is provided with a mounting shell, the mechanical hydraulic pump is connected to the mounting shell, the pump body of the mechanical hydraulic pump is located inside the hydraulic oil tank, and the drive device of the mechanical hydraulic pump is located inside the mounting shell; The pump body has a first pump port and a second pump port; the hydraulic oil tank is also provided with a mounting column, the mounting column is provided with a first pipeline and a second pipeline, the mounting column is also provided with a first connector and a second connector, the second pump port is connected to the first pipeline, the first pipeline is connected to the first connector, and the second pipeline is connected to the second connector; the drive device of the mechanical hydraulic pump is located inside the mounting housing; the interface assembly is connected to the first connector and the second connector; The torque converter includes a housing, within which a gear assembly and an output disc are disposed. The gear assembly includes a first gear, a second gear, and a third gear. There are two second gears, which mesh with the first gear and the third gear. The first gear and the second gear have the same number of teeth, while the third gear has a greater number of teeth than the first gear. The first gear has a square head hole, which is connected to the output end of the electric torque wrench. The output disc is mounted on the third gear and has an output section connected to the drive device.

[0006] In some embodiments, the third gear has a hollow inner cavity, and the circumferential inner wall surface of the inner cavity of the third gear is provided with a plurality of protrusions. The protrusions are spaced apart circumferentially along the inner cavity of the third gear, and adjacent protrusions define a receiving groove. The inner wall surface of each protrusion is also provided with a plurality of first protrusions, and adjacent first protrusions form a first groove. The output disk has a columnar structure, and the outer circumferential wall of the output disk is provided with a plurality of second protrusions, and adjacent second protrusions form second grooves; the first protrusion and the second groove engage with each other, and the second protrusion and the first groove engage with each other, so that the output disk and the third gear are relatively fixed.

[0007] In some embodiments, the lower side of the output disk is provided with a plurality of opening slots, and the plurality of opening slots are spaced apart along the axis of the output disk; the circumferential sidewall of the output disk is also provided with a positioning hole, the positioning hole being used to connect the opening slots and the receiving slot. The variable torque device further includes a plurality of rolling components, each of the rolling components including a rolling element and a fastener. The rolling element is installed in the opening groove, and a portion of the structure of the rolling element protrudes from the opening groove. The fastener passes through the positioning hole to connect the rolling element, and the end of the fastener is located in the receiving groove.

[0008] In some embodiments, the module of the first gear, the second gear, and the third gear is 4 mm; the tooth width of the first gear, the second gear, and the third gear is 32 mm; and the pressure angle of the first gear, the second gear, and the third gear is 20°.

[0009] In some embodiments, the first gear and the second gear each have 22 teeth, and the third gear has 45 teeth. Alternatively, the first gear and the second gear each have 20 teeth; the third gear has 60 teeth.

[0010] In some embodiments, the housing is further provided with a limiting seat, the limiting seat is provided with a limiting groove, the limiting groove is provided with a concave-convex structure, and the limiting groove is connected to the square head hole; The limiting seat includes a cylindrical seat body with a limiting groove. The outer side of the seat body is symmetrically provided with a first mounting part and a second mounting part along the axis of the seat body. The first mounting part and the second mounting part are threadedly connected and fixed to the upper surface of the outer shell.

[0011] In some embodiments, the bracket has an open movable slot on one side. The bracket includes a first side plate and a second side plate arranged in parallel and spaced apart. The open movable slot is defined between the first side plate and the second side plate. The first side plate has a first arc-shaped slot, and the second side plate has a second arc-shaped slot. The first arc-shaped slot and the second arc-shaped slot are arranged opposite to each other. The first arc-shaped slot and the second arc-shaped slot are connected. The sleeve near the connecting part is provided with a first arc-shaped protrusion and a second arc-shaped protrusion. Both the first arc-shaped protrusion and the second arc-shaped protrusion protrude from the end faces of both ends of the sleeve in the axial direction. The first arc-shaped protrusion is located in the first arc-shaped groove, and the second arc-shaped protrusion is located in the second arc-shaped groove. The first side plate is provided with a first limiting hole, and the second side plate is provided with a second limiting hole; the first limiting hole and the second limiting hole are arranged opposite to each other; The number of the connecting parts is two, the two connecting parts are arranged in parallel with a gap, a limiting groove is formed between the two connecting parts, and the driving part is located in the limiting groove; The connector has a T-shaped structure and includes a rod and an operating part connected to the rod. The rod connects the first limiting hole, the first through hole, the second through hole and the second limiting hole.

[0012] In some embodiments, the interface component includes a first connector, a second connector, a third connector, a fourth connector, a fifth connector, and a sixth connector; The first connector includes a first body, on which a first cylindrical portion and a second cylindrical portion are respectively provided on opposite sides; a first annular groove and a second annular groove are provided at intervals in the inner cavity of the first body; a first communicating hole is provided on the circumferential sidewall of the first cylindrical portion, the first communicating hole communicating with the inner cavity of the first cylindrical portion; the first body also provides a first channel communicating with the first annular groove and the inner cavity of the first cylindrical portion; a second communicating hole is provided on the circumferential sidewall of the second cylindrical portion, the second communicating hole communicating with the inner cavity of the second cylindrical portion; the first body also provides a second channel communicating with the second annular groove and the inner cavity of the second cylindrical portion. The second connector is connected to the hydraulic cylinder. The second connector includes a columnar second body. The second body is installed in the inner cavity of the first body. The second body is provided with an axially extending third channel and a fourth channel. The circumferential sidewall of the second body is provided with a third connecting hole and a fourth connecting hole. The third connecting hole connects the first annular groove and the third channel. The fourth connecting hole connects the second annular groove and the fourth channel. The third connector is sleeved on the first cylindrical part, one end of the third connector is provided with a first interface, and the third connector is also provided with a fifth channel. The first interface and the fifth channel are connected to the first connecting hole. The fourth connector is sleeved on the second cylindrical part, one end of the fourth connector is provided with a second interface, and the fourth connector is also provided with a sixth channel. The second interface, the sixth channel and the second connecting hole are connected. One end of the fifth connector is connected to and communicates with the first interface, and one end of the sixth connector is connected to and communicates with the second interface.

[0013] In some embodiments, the inner cavity of the first body is provided with a plurality of first sealing grooves at intervals, at least one of the first sealing grooves is provided between the first annular groove and the second annular groove, and a first sealing ring is provided in the first sealing groove; The inner cavity of the third connector is provided with a plurality of second sealing grooves, at least two of the second sealing grooves are located on both sides of the first connecting hole, and a second sealing ring is provided in the second sealing groove; The inner cavity of the fourth connector is provided with a plurality of third sealing grooves, at least two of the third sealing grooves are located on both sides of the second connecting hole, and a third sealing ring is provided in the third sealing groove.

[0014] Implementing this invention has the following beneficial effects: The dedicated wrench system for tightening flange bolts in confined spaces of nuclear power plants can solve the problems of tightening and torque value verification of flange bolts in confined spaces of nuclear power plants, effectively eliminate the hidden dangers of bolt loosening and valve cover leakage, and ensure the stable operation of nuclear power equipment. This dedicated wrench system for tightening flange bolts in confined spaces of nuclear power plants is simple to operate, improves on-site work efficiency, and requires no external power cord, making it highly convenient. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the structure of a special wrench system for tightening flange bolts in confined spaces of nuclear power plants, as described in some embodiments of the present invention. Figure 2 This is one of the structural schematic diagrams of the hydraulic oil tank in some embodiments of the present invention; Figure 3 This is a second schematic diagram of the structure of the hydraulic oil tank in some embodiments of the present invention; Figure 4 This is the third schematic diagram of the hydraulic oil tank in some embodiments of the present invention; Figure 5 This is one of the partial structural schematic diagrams of the hydraulic oil tank in some embodiments of the present invention; Figure 6 This is a second schematic diagram of a partial structure of the hydraulic oil tank in some embodiments of the present invention; Figure 7 This is the third of three partial structural schematic diagrams of the hydraulic oil tank in some embodiments of the present invention; Figure 8 This is the fourth partial structural schematic diagram of the hydraulic oil tank in some embodiments of the present invention; Figure 9 This is one of the structural schematic diagrams of the variable torque device in some embodiments of the present invention; Figure 10 This is a second schematic diagram of the structure of the variable torque device in some embodiments of the present invention; Figure 11 This is a partial structural schematic diagram of the torque-changing device in some embodiments of the present invention; Figure 12 These are partial exploded views of the gear assembly in some embodiments of the present invention; Figure 13 This is one of the structural schematic diagrams of a hydraulic wrench in some embodiments of the present invention; Figure 14 This is a second schematic diagram of the structure of the hydraulic wrench in some embodiments of the present invention; Figure 15 This is a partial structural schematic diagram of a hydraulic wrench in some embodiments of the present invention; Figure 16 This is one of the exploded views of a hydraulic wrench in some embodiments of the present invention; Figure 17 This is the second exploded view of a portion of the structure of the hydraulic wrench in some embodiments of the present invention; Figure 18 This is one of the exploded structural diagrams of the interface component in some embodiments of the present invention; Figure 19 This is the second exploded view of the interface component in some embodiments of the present invention; Figure 20 This is one of the cross-sectional views of the interface component in some embodiments of the present invention; Figure 21 This is a second cross-sectional view of the interface component in some embodiments of the present invention; Figure 22 This is a third cross-sectional view of the interface component in some embodiments of the present invention; Figure 23 This is a fourth cross-sectional view of the interface component in some embodiments of the present invention; Figure 24 This is a schematic diagram illustrating the application of a hydraulic wrench in some embodiments of the present invention. Detailed Implementation

[0016] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0017] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0018] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0019] See Figures 1 to 24 This invention discloses a dedicated wrench system for tightening flange bolts in confined spaces of nuclear power plants. It solves the problems of tightening flange bolts and verifying torque values ​​in confined spaces of nuclear power plants, effectively eliminating the hidden dangers of bolt loosening and valve cover leakage, and ensuring the stable operation of nuclear power equipment. The flange bolts can be, but are not limited to, flange bolts of electrically operated gate valves in nuclear power plants.

[0020] See Figures 1 to 24 The confined space flange bolt tightening wrench system of this nuclear power plant includes a hydraulic oil tank 10, a mechanical hydraulic pump 20, a torque converter 30, an electric torque wrench 40, and a hydraulic wrench 50.

[0021] The mechanical hydraulic pump 20 is installed on the hydraulic oil tank 10. The mechanical hydraulic pump 20 has a drive device 22. The torque converter 30 is installed on the hydraulic oil tank 10 and is connected to the drive device 22. The electric torque wrench 40 is connected to the torque converter 30 to output torque to the mechanical hydraulic pump 20 through the torque converter 30, and then supply hydraulic oil to the hydraulic wrench 50. The hydraulic oil tank 10 includes a bracket 51, a hydraulic cylinder 52, a sleeve 53, a connector 54, a reaction arm 55, and an interface assembly 56. The sleeve 53 is fitted onto the nut of a flange bolt. The outer surface of the sleeve 53 has a connecting portion 531 located within the bracket 51. The connecting portion 531 has a first through hole 5311. The end of the drive rod 521 of the hydraulic cylinder 52 has a drive portion 522, which has a second through hole 5221. The connector 54 connects the bracket 51, the first through hole 5311, and the second through hole 5221. At least a portion of the lower surface of the sleeve 53 has a notch 532.

[0022] The reaction arm 55 is rotatably mounted on the bracket 51 and is located on one side of the sleeve 53; the interface assembly 56 is connected to the hydraulic cylinder 52 and the interface assembly 56 is connected to the hydraulic oil tank 10 or the pump body 21 of the mechanical hydraulic pump 20.

[0023] like Figures 1 to 12 In some embodiments, the hydraulic oil tank 10 is generally square in shape and can be used to store hydraulic oil. The hydraulic oil tank 10 may be provided with a mounting shell 11. The mechanical hydraulic pump 20 is connected to the mounting shell 11. The pump body 21 of the mechanical hydraulic pump 20 is located inside the hydraulic oil tank 10, and the drive device 22 of the mechanical hydraulic pump 20 is located inside the mounting shell 11.

[0024] The pump body 21 has a first pump port 211 and a second pump port 212. The first pump port 211 can be an oil inlet, and the second pump port 212 can be an oil outlet. The hydraulic oil tank 10 is also provided with a mounting post 12, which has a first pipeline 121 and a second pipeline 122 inside. The mounting post 12 is also provided with a first connector 13 and a second connector 14. The first pump port 211 can be extended into the inner cavity of the hydraulic oil tank 10 through a short pipe. The second pump port 212 is connected to the first pipeline 121. For example, the second pump port 212 can be connected to the first pipeline 121 through a connecting pipe. The first pipeline 121 is connected to the first connector 13, and the second pipeline 122 is connected to the second connector 14. The drive device 22 of the mechanical hydraulic pump 20 is located inside the mounting housing 11. The interface assembly 56 is connected to the first connector 13 and the second connector 14. The first connector 13 can be an outlet connector, and the second connector 14 can be an inlet connector. The first connector 13 can be connected to the fifth connector 565 of the interface assembly 56 via a first pipeline, and the second connector 14 can be connected to the sixth connector 566 of the interface assembly 56 via a second pipeline, thereby forming a hydraulic circuit. The electric torque wrench 40 has forward and reverse rotation functions, and the direction of hydraulic oil flow can be changed by adjusting the drive of the drive device 22.

[0025] The torque converter 30 is mounted on the hydraulic oil tank 10. The torque converter 30 includes a housing 31, within which a gear assembly 32 and an output disc 33 are disposed. The gear assembly 32 includes a first gear 321, a second gear 322, and a third gear 323. There are two second gears 322. The line connecting the axis of the first gear 321 and the axis of the third gear 323 is a reference line. The two second gears 322 are symmetrically arranged relative to the reference line and mesh with the first gear 321 and the third gear 323. The first gear 321 and the second gear 322 have the same number of teeth, while the third gear 323 has a greater number of teeth than the first gear 321. The first gear 321 has a square head hole 3211, which is connected to the output end of the electric torque wrench 40. The output disc 33 is mounted on the third gear 323 and has an output section 331 connected to the drive device 22.

[0026] The electric torque wrench 40 increases the torque output through the torque converter 30, thereby increasing the torque output of the mechanical hydraulic pump 20. Hydraulic oil can be delivered to the hydraulic wrench 50 through the first pipeline 121 and the first connector 13.

[0027] This dedicated wrench system for tightening flange bolts in confined spaces of nuclear power plants amplifies the output torque of the torque converter 30, enhancing torque output capacity and hydraulic power. The electric torque wrench 40 drives the mechanical hydraulic pump 20 via the torque converter 30, eliminating the need for an external power supply and making on-site operation convenient. The output pressure of the mechanical hydraulic pump 20 can be adjusted by regulating the output torque of the electric torque wrench 40, resulting in high precision hydraulic power control and good practicality.

[0028] like Figures 1 to 4 In some embodiments, the mounting post 12 is provided with a pressure gauge 15, which is mounted on the portion of the mounting post 12 located in the first pipeline 121. The pressure gauge 15 can be used to detect the hydraulic pressure of the first pipeline 121, and the output torque value of the electric torque wrench 40 can be adjusted by the value of the pressure gauge 15.

[0029] like Figures 1 to 4 In some embodiments, the bottom of the hydraulic oil tank 10 is provided with a plurality of casters 16. The casters 16 may be located at the four opposite corners of the bottom of the hydraulic oil tank 10, and the number of casters 16 may be four. The casters 16 may be casters with a self-locking function.

[0030] See Figures 9 to 11In some embodiments, the housing 31 is generally rectangular, and the first gear 321, the second gear 322, and the third gear 323 can be arranged along the length of the housing 31. The two second gears 322 are symmetrically arranged relative to the reference line, and the two second gears 322 mesh with the first gear 321 and the third gear 323. Through the mutual cooperation of the two second gears 322 and the third gear 323, the gear assembly 32 has better load-bearing capacity and transmission stability. The two second gears 322 can evenly distribute the load, which can greatly improve the overall load-bearing capacity of the gear assembly 32.

[0031] See Figure 12 In some embodiments, the third gear 323 has a hollow inner cavity. The circumferential inner wall surface of the inner cavity of the third gear 323 is provided with a plurality of protrusions 3231. The protrusions 3231 are spaced apart along the circumferential direction of the inner cavity of the third gear 323. Adjacent protrusions 3231 define a receiving groove 3232. The inner wall surface of each protrusion 3231 is also provided with a plurality of first protrusions 32311. Adjacent first protrusions 32311 form a first groove 32312.

[0032] The output disk 33 has a columnar structure. The output portion 331 can be fixedly connected to or welded to the inner cavity of the output disk 33. In other embodiments, the output disk 33 and the output portion 331 are integrally formed. The circumferential outer wall surface of the output disk 33 is provided with a plurality of second protrusions 332, and adjacent second protrusions 332 form second grooves 333. The first protrusion 32311 engages with the second groove 333, and the second protrusion 332 engages with the first groove 32312, so that the output disk 33 and the third gear 323 are relatively fixed. In some embodiments, the output disk 33 can also be integrally formed with the third gear 323.

[0033] like Figure 12 As shown, in some embodiments, the lower side of the output disk 33 is provided with a plurality of opening slots 334, and the plurality of opening slots 334 are spaced apart along the axis of the output disk 33; the circumferential sidewall of the output disk 33 is also provided with a positioning hole 335, which is used to connect the opening slots 334 and the receiving slots 3232.

[0034] The variable torque device 30 also includes a plurality of rolling assemblies 34, each of which includes a rolling element 341 and a fastener 342. The rolling element 341 is mounted in the opening groove 334, and a portion of the structure of the rolling element 341 protrudes from the opening groove 334 to contact the bottom plate of the housing 31. The fastener 342 passes through the positioning hole 335 to connect the rolling element 341, and the end of the fastener 342 is located in the receiving groove 3232.

[0035] Preferably, the rolling element 341 includes, but is not limited to, rolling bearings or rollers, and the fastener 342 can be, but is not limited to, screws, bolts, or shafts. When the fastener 342 is a screw or bolt, the positioning hole 335 can be a threaded hole. The fastener 342 can be a dumbbell-shaped structure, larger at both ends and smaller in the middle. The middle part of the fastener 342 is used for mounting the rolling element 341, and the middle part of the fastener 342 may not have an external threaded surface to facilitate stable rolling of the rolling element 341.

[0036] like Figure 12 As shown, in some embodiments, the number of scrolling components 34 can be five, and the scrolling direction of the scrolls 341 of the five scrolling components 34 is on the same circle.

[0037] like Figures 9 to 12 As shown, in some embodiments, the output section 331 is in the shape of a square column, and the drive device 22 is provided with a square column groove 221 that cooperates with the output section 331.

[0038] In some embodiments, the module of the first gear 321, the second gear 322 and the third gear 323 is 4mm; the tooth width of the first gear 321, the second gear 322 and the third gear 323 is 32mm; and the pressure angle of the first gear 321, the second gear 322 and the third gear 323 is 20°.

[0039] In some embodiments, the first gear 321 and the second gear 322 each have 22 teeth, and the third gear 323 has 45 teeth; or, the first gear 321 and the second gear 322 each have 20 teeth, and the third gear 323 has 60 teeth. Of course, the number of teeth on the first gear 321, the second gear 322, and the third gear 323 can be selected and set according to actual needs, and no specific limitation is made here.

[0040] In some embodiments, the first gear 321, the second gear 322, and the third gear 323 are all made of 37Cr4 material. Of course, the manufacturing materials of the first gear 321, the second gear 322, and the third gear 323 can also be selected and set according to actual needs, and no specific limitation is made here.

[0041] like Figure 9 As shown, in some embodiments, the housing 31 is further provided with a limiting seat 35, which has a limiting groove 3511 and a concave-convex structure 3512. The limiting groove 3511 communicates with the square head hole 3211. The concave-convex structure 3512 can limit the housing of the output end of the electric torque wrench 40, and act as a reaction arm. The electric torque wrench 40 can be a rechargeable electric torque wrench.

[0042] like Figure 9 As shown, in some embodiments, the limiting seat 35 includes a cylindrical seat body 351 with a limiting groove 3511. A first mounting portion 352 and a second mounting portion 353 are symmetrically arranged on the outer surface of the seat body 351 along its axis. The first mounting portion 352 and the second mounting portion 353 are threadedly connected and fixed to the upper surface of the outer casing 31, for example, by screws or bolts. The use of the first mounting portion 352 and the second mounting portion 353 for limiting and fixing improves the installation stability of the limiting seat 35.

[0043] like Figure 9 As shown, in some embodiments, the concave-convex structure 3512 includes a wavy structure 35121 and a serrated structure 35122. The wavy structure 35121 is disposed near the upper surface of the housing 31, and the serrated structure 35122 is disposed away from the upper surface of the housing 31. The wavy structure 35121 and the serrated structure 35122 can limit the housing of the output end of the electric torque wrench 40, and act as a reaction arm. For the specific structure of the wavy structure 35121 and the serrated structure 35122, please refer to [reference needed]. Figure 9 As shown. The distance between the two opposing inner convex structures of the wavy structure 35121 is smaller than the distance between the two opposing inner convex structures of the sawtooth structure 35122.

[0044] like Figure 1 As shown, in some embodiments, the bottom of the outer casing 31 is further provided with a connecting plate for connecting to the upper surface of the hydraulic oil tank 10, so as to fix the outer casing 31 to the upper surface containing the hydraulic oil tank 10. There can be two connecting plates, which are generally rectangular in shape. The connecting plates have oblong holes to allow for adjustment of the position of the connecting plates with fastening bolts or screws, thereby adjusting the position of the outer casing 31. Alternatively, in some embodiments, the connecting plate may not be provided. Instead, the outer casing 31 has multiple first fixing holes, and the upper surface of the hydraulic oil tank 10 has multiple second fixing holes. Fastening bolts or screws are passed through the first and second fixing holes, thereby fixing the outer casing 31 relative to the upper surface of the hydraulic oil tank 10. The first fixing holes can be smooth through holes, and the second fixing holes can be threaded holes.

[0045] Figures 13 to 24 In some embodiments, a hydraulic wrench 50 serves as the actuating component to tighten the flange bolts. A sleeve 53 is used to fit onto the nut of the flange bolt. The sleeve 53 is generally annular in shape, and its inner cavity has a continuously arranged concave-convex structure to facilitate a secure engagement with the nut of the flange bolt. Of course, the shape of the inner cavity of the sleeve 53 can also be adapted to the shape of the nut of the flange bolt.

[0046] The outer side of the sleeve 53 is provided with a connecting part 531, which is located in the bracket 51. The connecting part 531 has a first through hole 5311. The end of the drive rod 521 of the hydraulic cylinder 52 has a drive part 522, which has a second through hole 5221. The axis of the second through hole 5221 is offset from the axis of the drive rod 521. The connector 54 connects the bracket 51, the first through hole 5311, and the second through hole 5221. At least a portion of the lower surface of the sleeve 53 has a notch 532, which can penetrate the inner and outer walls of the sleeve 53. The notch 532 can be a contour notch. The notch 532 can avoid restricted positions (such as...). Figure 24 As shown in the figure, the bolts are then tightened.

[0047] The reaction arm 55 is rotatably mounted on the bracket 51 and is located on one side of the sleeve 53. The interface assembly 56 is connected to the hydraulic cylinder 52 and can be connected to the hydraulic oil tank 10 via a connecting pipeline to input hydraulic oil into the hydraulic cylinder 52, thereby driving the drive rod 521 to move outward, pushing the sleeve 53 to rotate, and then tightening the flange bolts. A torque of 2000 Nm-2500 Nm is typically required for tightening. The connecting pipeline can be equipped with quick couplings for easy connection.

[0048] The hydraulic wrench 50 is used as follows: the interface assembly 56 is connected to the hydraulic source through the connecting pipeline to supply hydraulic oil to the hydraulic cylinder 52. The sleeve 53 is fitted onto the nut of the flange bolt, avoiding the restricted position through the notch 532. The reaction arm 55 abuts against the adjacent bolt of the flange bolt that needs to be tightened. According to the required tightening torque of the flange bolt, the output torque of the electric torque wrench 40 is first set, and then the electric torque wrench 40 is started. The electric torque wrench 40 drives the three-stage gear assembly 32 of the torque converter 30 to rotate, which in turn drives the mechanical hydraulic pump 20 to output pressure, causing the sleeve 53 of the hydraulic wrench 50 to move, thereby achieving the tightening of the flange bolt.

[0049] In some embodiments, the bracket 51 has an open movable slot 51a on one side. The bracket 51 includes a first side plate 511 and a second side plate 512 arranged in parallel and spaced apart. The open movable slot 51a is defined between the first side plate 511 and the second side plate 512. In some embodiments, the bracket 51 further includes a reinforcing plate 513 connecting the first side plate 511 and the second side plate 512. The reinforcing plate 513 is disposed opposite to the reaction arm 55, and the reinforcing plate 513 can improve the structural strength of the bracket 51. In addition, the bracket 51 may also include a reinforcing block 514 connecting the first side plate 511 and the second side plate 512. The reinforcing block 514 is disposed near the interface assembly 56. In some embodiments, the bracket 51 has a clearance groove, and the hydraulic cylinder 52 is located in the clearance groove, making the overall structure of the hydraulic wrench 50 more compact and more suitable for confined space operations. The overall structural shape of the bracket 51 can be as follows: Figures 13 to 15 As shown.

[0050] The first side plate 511 is provided with a first arc-shaped groove 5111, and the second side plate 512 is provided with a second arc-shaped groove 5121. The first arc-shaped groove 5111 and the second arc-shaped groove 5121 are arranged opposite to each other. The first arc-shaped groove 5111 and the second arc-shaped groove 5121 are connected.

[0051] The sleeve 53 near the connecting part 531 is provided with a first arc-shaped protrusion 533 and a second arc-shaped protrusion 534. The first arc-shaped protrusion 533 and the second arc-shaped protrusion 534 both protrude from the end faces of the two ends of the sleeve 53 along the axial direction. The first arc-shaped protrusion 533 is located in the first arc-shaped groove 5111, and the second arc-shaped protrusion 534 is located in the second arc-shaped groove 5121.

[0052] The sleeve 53 can be slidably assembled into the bracket 51 via the first arc-shaped groove 5111 and the second arc-shaped groove 5121. The first arc-shaped groove 5111 and the second arc-shaped groove 5121 can guide and limit the sleeve 53 when the flange bolts are tightened. Different sleeves 53 can be matched with different flange bolts, and the sleeve 53 can be fixed relative to the bracket 51 by the plug-in part 54.

[0053] like Figure 16 and Figure 17 The first side plate 511 is provided with a first limiting hole 5112, and the second side plate 512 is provided with a second limiting hole 5122; the first limiting hole 5112 and the second limiting hole 5122 are arranged opposite to each other.

[0054] There are two connecting parts 531, which are arranged in parallel with a gap between them, and a limiting groove is formed between the two connecting parts 531. The driving part 522 is located in the limiting groove.

[0055] The connector 54 has a T-shaped structure and includes a rod portion 541 and an operating portion 542 connected to the rod portion 541. The rod portion 541 connects the first limiting hole 5112, the first through hole 5311, the second through hole 5221, and the second limiting hole 5122. The rod portion 541 can be a screw, so that the connecting portion 531 and the driving portion 522 are relatively fixed. When the driving rod 521 drives the driving portion 522 to rotate, the driving portion 522 drives the screw to rotate, which in turn drives the connecting portion 531 to move.

[0056] like Figures 18 to 23 As shown, in some embodiments, the interface component 56 includes a first connector 561, a second connector 562, a third connector 563, a fourth connector 564, a fifth connector 565, and a sixth connector 566.

[0057] The first connector 561 includes a first body 5611, which is generally square columnar in shape. The first body 5611 has a first cylindrical portion 5612 and a second cylindrical portion 5613 on opposite sides. The inner cavity of the first body 5611 is provided with a first annular groove 56111 and a second annular groove 56112 spaced apart. The circumferential sidewall of the first cylindrical portion 5612 has a first connecting hole 56121. The first connecting hole 56121 and the first cylindrical portion 56113 are connected. The inner cavity of the first cylindrical portion 5612 is connected. The first main body 5611 is also provided with a first channel 56113 connecting the first annular groove 56111 and the inner cavity of the first cylindrical portion 5612. The circumferential sidewall of the second cylindrical portion 5613 is provided with a second connecting hole 56131, which is connected to the inner cavity of the second cylindrical portion 5613. The first main body 5611 is also provided with a second channel 56114 connecting the second annular groove 56112 and the inner cavity of the second cylindrical portion 5613.

[0058] The second connector 562 is connected to the hydraulic cylinder 52. The second connector 562 includes a columnar second body 5621, which may be generally cylindrical. The second body 5621 is installed in the inner cavity of the first body 5611, allowing the first connector 561 to rotate about the axis of the second body 5621. The second body 5621 has an axially extending third channel 56211 and a fourth channel 56212. The circumferential sidewall of the second body 5621 has a third connecting hole 56213 and a fourth connecting hole 56214. The third connecting hole 56213 connects the first annular groove 56111 and the third channel 56211, and the fourth connecting hole 56214 connects the second annular groove 56112 and the fourth channel 56212.

[0059] The third connector 563 is sleeved on the first cylindrical part 5612, so that the third connector 563 can rotate around the axis of the first cylindrical part 5612. One end of the third connector 563 is provided with a first interface 5631, and the third connector 563 is also provided with a fifth channel 5632. The first interface 5631 and the fifth channel 5632 are connected to the first connecting hole 56121.

[0060] The fourth connector 564 is sleeved on the second cylindrical portion 5613, so that the fourth connector 564 can rotate around the axis of the second cylindrical portion 5613. One end of the fourth connector 564 is provided with a second interface 5641, and the fourth connector 564 is also provided with a sixth channel 5642. The second interface 5641 and the sixth channel 5642 are connected to the second connecting hole 56131.

[0061] One end of the fifth connector 565 is connected to and communicates with the first interface 5631, and one end of the sixth connector 566 is connected to and communicates with the second interface 5641. The hydraulic cylinder 52 may include a first chamber and a second chamber. The first chamber may communicate with the third channel 56211, and the second chamber may communicate with the fourth channel 56212. When hydraulic oil enters the first chamber, it can drive the drive rod 521 to move outward. Of course, the fifth connector 565 and the sixth connector 566 may be connected to the first connector 13 and the second connector 14 of the hydraulic oil tank 10 as needed to control the extension and retraction of the drive rod 521. These are implementations that can be made by those skilled in the art according to requirements, and are not specifically limited here.

[0062] like Figures 18 to 23 As shown, in some embodiments, the inner cavity of the first body 5611 is provided with a plurality of first sealing grooves 56115 at intervals, at least one of the first sealing grooves 56115 is provided between the first annular groove 56111 and the second annular groove 56112, and a first sealing ring 56116 is provided in the first sealing groove 56115; the provision of the first sealing ring 56116 can improve the sealing performance.

[0063] The inner cavity of the third connector 563 is provided with a plurality of second sealing grooves 5633, at least two of the second sealing grooves 5633 are located on both sides of the first connecting hole 56121, and a second sealing ring 5634 is provided in the second sealing groove 5633. The second sealing ring 5634 can improve the sealing performance.

[0064] The inner cavity of the fourth connector 564 is provided with a plurality of third sealing grooves 5643, at least two of which are located on both sides of the second connecting hole 56131. ​​A third sealing ring 5644 is provided in the third sealing groove 5643. The third sealing ring 5644 can improve the sealing performance.

[0065] It should be noted that during the manufacturing process, the ends of the first connector 561, the second connector 562, the third connector 563 and the fourth connector 564 may have process holes. These process holes can be sealed by welding with sealing blocks to ensure airtightness.

[0066] like Figure 18 and Figure 19 As shown, in some embodiments, the third connector 563 has a first protrusion, and the fourth connector 564 has a first recess. The first protrusion and the first recess are connected by a first connecting rod after they cooperate with each other. Alternatively, the third connector 563 has a second recess, and the fourth connector 564 has a second protrusion. The second protrusion and the second recess are connected by a second connecting rod after they cooperate with each other.

[0067] This dedicated wrench system for tightening flange bolts in confined spaces of nuclear power plants has the following advantages: (1) The electric torque wrench 40 drives the mechanical hydraulic pump 20 through the torque converter 30, which does not require an external power supply and is user-friendly on-site. The output pressure of the mechanical hydraulic pump 20 can be changed by adjusting the output torque of the electric torque wrench 40. The hydraulic power control accuracy is high, which is conducive to improving the tightening effect of flange bolts and the accuracy of torque value verification. The hydraulic wrench 50 is designed with a notch 532 on the sleeve 53, which can avoid the restricted position on site and then be fitted onto the nut of the flange bolt to be tightened. The plug-in connector 54 connects the drive rod 521 and the sleeve 53 (working head), which can realize the quick replacement of the sleeve 53, realize the adaptation of different specifications of flange bolt nuts, improve the equipment reuse rate and on-site operation efficiency, and reduce equipment costs.

[0068] This dedicated wrench system for tightening flange bolts in confined spaces in nuclear power plants is easy to operate, requires no external power cord, and is highly convenient. It can accommodate various sizes of flange bolts and nuts and is suitable for confined spaces. Compared with traditional methods (such as using straight-handle wrenches), it enables the tightening of valve bolts in confined space environments, improving on-site work efficiency and reducing equipment costs.

[0069] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A nuclear power plant restricted space flange bolt fastening special wrench system, characterized in that, The hydraulic oil tank (10), the mechanical hydraulic pump (20), the variable torque device (30), the electric torque wrench (40) and the hydraulic wrench (50) are included. The mechanical hydraulic pump (20) is installed on the hydraulic oil tank (10), the mechanical hydraulic pump (20) has a driving device (22), the variable torque device (30) is installed on the hydraulic oil tank (10), and the variable torque device (30) is connected with the driving device (22), the electric torque wrench (40) is connected with the variable torque device (30) to output torque to the mechanical hydraulic pump (20) through the variable torque device (30), and then provide hydraulic oil to the hydraulic wrench (50). The hydraulic oil tank (10) includes a bracket (51), a hydraulic cylinder (52), a sleeve (53), a plug-in part (54), a counterforce arm (55) and an interface assembly (56). The sleeve (53) is used for sleeving on the nut of a flange bolt, the outer side of the sleeve (53) is provided with a connecting part (531) located in the bracket (51), the connecting part (531) is provided with a first through hole (5311), the end of the driving rod (521) of the hydraulic cylinder (52) is provided with a driving part (522) provided with a second through hole (5221), the plug-in part (54) connects the bracket (51), the first through hole (5311) and the second through hole (5221), and at least part of the lower surface of the sleeve (53) is provided with a notch (532). The counterforce arm (55) is rotatably installed on the bracket (51) and located on one side of the sleeve (53), the interface assembly (56) is connected with the hydraulic cylinder (52) and the hydraulic oil tank (10).

2. The nuclear power plant limited space flange bolting special purpose wrench system according to claim 1, characterized in that, The hydraulic oil tank (10) is provided with a mounting shell (11), the mechanical hydraulic pump (20) is connected with the mounting shell (11), the pump body (21) of the mechanical hydraulic pump (20) is located in the hydraulic oil tank (10), and the driving device (22) of the mechanical hydraulic pump (20) is located in the mounting shell (11). The pump body (21) is provided with a first pump port (211) and a second pump port (212), the hydraulic oil tank (10) is further provided with a mounting column (12), the mounting column (12) is provided with a first pipeline (121) and a second pipeline (122), the mounting column (12) is further provided with a first connecting head (13) and a second connecting head (14), the second pump port (212) is connected with the first pipeline (121), the first pipeline (121) is connected with the first connecting head (13), the second pipeline (122) is connected with the second connecting head (14), the driving device (22) of the mechanical hydraulic pump (20) is located in the mounting shell (11), and the interface assembly (56) is connected with the first connecting head (13) and the second connecting head (14). The variable torque device (30) comprises a housing (31), a gear assembly (32) and an output disc (33) arranged in the housing (31), the gear assembly (32) comprises a first gear (321), a second gear (322) and a third gear (323), the number of the second gears (322) is two, the two second gears (322) are engaged with the first gear (321) and the third gear (323), the number of teeth of the first gear (321) is the same as that of the second gear (322), and the number of teeth of the third gear (323) is greater than that of the first gear (321), the first gear (321) is provided with a square head hole (3211) connected with an output end of the electric torque wrench (40), and the output disc (33) is installed on the third gear (323) and is provided with an output part (331) connected with the driving device (22).

3. The nuclear power plant limited space flange bolting special purpose wrench system according to claim 2, characterized in that, The third gear (323) has a hollow inner cavity, the circumferential inner wall surface of the inner cavity of the third gear (323) is provided with a plurality of protrusions (3231), the protrusions (3231) are arranged at intervals in the circumferential direction of the inner cavity of the third gear (323), adjacent protrusions (3231) define a receiving groove (3232), and the inner wall surface of each protrusion (3231) is further provided with a plurality of first protrusions (32311), adjacent first protrusions (32311) form a first groove (32312). The output disc (33) has a columnar structure, the circumferential outer wall surface of the output disc (33) is provided with a plurality of second protrusions (332), adjacent second protrusions (332) form a second groove (333), the first protrusions (32311) and the second grooves (333) are clamped with each other, and the second protrusions (332) and the first grooves (32312) are clamped with each other, so that the output disc (33) is relatively fixed with the third gear (323).

4. The nuclear power plant limited space flange bolting special purpose wrench system according to claim 3, characterized in that, The lower side of the output disc (33) is provided with a plurality of open grooves (334), and the plurality of open grooves (334) are arranged at intervals along the axis of the output disc (33); the circumferential side wall of the output disc (33) is further provided with a positioning hole (335) for connecting the open groove (334) and the receiving groove (3232); The variable torque device (30) further comprises a plurality of rolling assemblies (34), each rolling assembly (34) comprises a rolling member (341) and a fastener (342), the rolling member (341) is installed in the open groove (334), and part of the structure of the rolling member (341) protrudes out of the open groove (334), the fastener (342) is arranged in the positioning hole (335) to connect the rolling member (341), and the end of the fastener (342) is located in the receiving groove (3232).

5. The nuclear power plant limited space flange bolting special purpose wrench system, as claimed in claim 2, wherein, The module of the first gear (321), the second gear (322) and the third gear (323) is 4mm; the tooth width of the first gear (321), the second gear (322) and the third gear (323) is 32mm; the pressure angle of the first gear (321), the second gear (322) and the third gear (323) is 20°.

6. The nuclear power plant limited space flange bolting special purpose wrench system, as claimed in claim 2, wherein, The tooth number of the first gear (321) and the second gear (322) is 22 teeth, and the tooth number of the third gear (323) is 45 teeth. Alternatively, the tooth number of the first gear (321) and the second gear (322) is 20 teeth; the tooth number of the third gear (323) is 60 teeth.

7. The nuclear power plant limited space flange bolting special purpose wrench system, as claimed in claim 2, wherein, The outer shell (31) is further provided with a limiting seat (35), the limiting seat (35) is provided with a limiting groove (3511), the limiting groove (3511) is provided with a concave-convex structure (3512), and the limiting groove (3511) is in communication with the square head hole (3211); The limiting seat (35) includes a circular cylindrical seat body (351), the seat body (351) is provided with the limiting groove (3511), the outer side surface of the seat body (351) is symmetrically provided with a first mounting portion (352) and a second mounting portion (353) along the axis of the seat body (351), and the first mounting portion (352) and the second mounting portion (353) are threadedly connected and fixed to the upper surface of the outer shell (31).

8. The nuclear power plant confined space flange bolting specialized wrench system, as recited in claim 1, characterized in that, One side of the bracket (51) is provided with an open movable groove (51a), the bracket (51) includes a first side plate (511) and a second side plate (512) arranged in parallel and spaced apart, the open movable groove (51a) is defined between the first side plate (511) and the second side plate (512), the first side plate (511) is provided with a first arc-shaped groove (5111), the second side plate (512) is provided with a second arc-shaped groove (5121), and the first arc-shaped groove (5111) and the second arc-shaped groove (5121) are oppositely arranged; the first arc-shaped groove (5111) and the second arc-shaped groove (5121) are in communication; The part close to the connecting portion (531) of the sleeve (53) is provided with a first arc-shaped convex portion (533) and a second arc-shaped convex portion (534), the first arc-shaped convex portion (533) and the second arc-shaped convex portion (534) protrude from the end faces of the two ends of the axial direction of the sleeve (53), the first arc-shaped convex portion (533) is located in the first arc-shaped groove (5111), and the second arc-shaped convex portion (534) is located in the second arc-shaped groove (5121); The first side plate (511) is provided with a first limiting hole (5112), and the second side plate (512) is provided with a second limiting hole (5122); the first limiting hole (5112) and the second limiting hole (5122) are oppositely arranged; The connecting parts (531) are two in number and are arranged in parallel at intervals, forming a limiting groove between the two connecting parts (531), and the driving part (522) is located in the limiting groove; The plug-in part (54) is in T-shaped structure, comprising a rod part (541) and an operating part (542) connected with the rod part (541), and the rod part (541) is connected with the first limiting hole (5112), the first through hole (5311), the second through hole (5221) and the second limiting hole (5122).

9. The nuclear power plant confined space flange bolting specialized hand tool system, as claimed in claim 1, wherein, The interface assembly (56) comprises a first joint (561), a second joint (562), a third joint (563), a fourth joint (564), a fifth joint (565) and a sixth joint (566); The first joint (561) comprises a first body (5611), and opposite sides of the first body (5611) are respectively provided with a first cylindrical part (5612) and a second cylindrical part (5613); a first annular groove (56111) and a second annular groove (56112) are arranged at intervals in the inner cavity of the first body (5611); a first communication hole (56121) is arranged on the circumferential side wall of the first cylindrical part (5612), and the first communication hole (56121) is in communication with the inner cavity of the first cylindrical part (5612); the first body (5611) is further provided with a first channel (56113) in communication with the first annular groove (56111) and the inner cavity of the first cylindrical part (5612); a second communication hole (56131) is arranged on the circumferential side wall of the second cylindrical part (5613), and the second communication hole (56131) is in communication with the inner cavity of the second cylindrical part (5613); the first body (5611) is further provided with a second channel (56114) in communication with the second annular groove (56112) and the inner cavity of the second cylindrical part (5613); The second joint (562) is connected with the hydraulic cylinder (52), and the second joint (562) comprises a cylindrical second body (5621) mounted in the inner cavity of the first body (5611), the second body (5621) is provided with an axially extending third channel (56211) and a fourth channel (56212), the circumferential side wall of the second body (5621) is provided with a third communication hole (56213) and a fourth communication hole (56214), the third communication hole (56213) is in communication with the first annular groove (56111) and the third channel (56211), and the fourth communication hole (56214) is in communication with the second annular groove (56112) and the fourth channel (56212). The third joint (563) is sleeved on the first cylindrical part (5612), one end of the third joint (563) is provided with a first interface (5631), the third joint (563) is further provided with a fifth channel (5632) in it, and the first interface (5631) and the fifth channel (5632) are in communication with the first communication hole (56121); The fourth joint (564) is sleeved on the second cylindrical part (5613), one end of the fourth joint (564) is provided with a second interface (5641), the fourth joint (564) is further provided with a sixth channel (5642) in it, and the second interface (5641) and the sixth channel (5642) are in communication with the second communication hole (56131); One end of the fifth joint (565) is connected and in communication with the first interface (5631), and one end of the sixth joint (566) is connected and in communication with the second interface (5641).

10. The nuclear power plant limited space flange bolting special purpose wrench system according to claim 9, characterized in that, The first main body (5611) is provided with a plurality of first sealing grooves (56115) in the inner cavity, at least one first sealing groove (56115) is arranged between the first annular groove (56111) and the second annular groove (56112), and the first sealing groove (56115) is provided with a first sealing ring (56116) in it; The inner cavity of the third joint (563) is provided with a plurality of second sealing grooves (5633), at least two second sealing grooves (5633) are located on both sides of the first communication hole (56121), and the second sealing groove (5633) is provided with a second sealing ring (5634) in it; The inner cavity of the fourth joint (564) is provided with a plurality of third sealing grooves (5643), at least two third sealing grooves (5643) are located on both sides of the second communication hole (56131), and the third sealing groove (5643) is provided with a third sealing ring (5644) in it.

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