A nuclear power plant reactor building equipment gate opening and closing operation anti-falling tool

Abstract

The utility model relates to a kind of nuclear power plant reactor plant equipment gate switch operation anti-falling tools, and the anti-falling tool is used to prevent spanner and sleeve fall, annular groove is provided on the sleeve;The anti-falling tool includes: with the annular groove of the sleeve is matched and can be embedded in the annular groove free sliding open type retainer ring, it includes retainer ring body and opening;And one end with the opening of the open type retainer ring both ends connection, the other end of steel wire rope of the spanner is covered.The utility model has the advantages of improving operation process and efficiency, improving safety and environmental adaptability, applicable to nuclear power plant high-risk environment requirements compared with prior art.

Description

Technical Field

[0001] This utility model relates to a fall protection tool, and more particularly to a fall protection tool for operating the gate switch of equipment in a nuclear power plant reactor building. Background Technology

[0002] During nuclear power unit shutdown and maintenance, a large amount of equipment and materials need to enter and exit the reactor building, requiring the reactor building equipment gates to provide access. The opening and closing of the reactor building equipment gates is achieved through the disassembly and assembly of the gate hinge bolts and the use of a winch. The hinge bolt nuts are 46mm hexagonal nuts, requiring a 46mm heavy-duty socket and ratchet wrench for disassembly and assembly. Since the 46mm heavy-duty socket weighs 1.63kg, which is quite heavy, and the gate operation involves a height difference of approximately 4m, the original anti-fall-off measure for the ratchet wrench and socket was to attach one end of a fall arrest rope to the ratchet wrench, while the other end, due to the smooth surface of the heavy-duty socket and the lack of a reliable anchor point, had to be secured to the heavy-duty socket using anti-foreign-object tape.

[0003] However, when using anti-foreign-object tape to secure the fall-prevention tool rope to a heavy-duty socket for gate opening and closing operations, the wrench rotates the socket, causing the tool rope to rotate with the socket, easily leading to entanglement and affecting operation. Furthermore, the tape is affected by temperature and humidity (softening at high temperatures, embrittlement at low temperatures) and is easily corroded and dissolved by oil / solvents (such as lubricating oil); the tape has weak tensile strength and tear resistance, easily peeling and failing under dynamic loads; the tape's strength decreases after aging, and it is difficult to inspect tool rope wear in the covered area. This method is a temporary fall prevention measure that affects operation and has serious safety defects, posing a significant risk of objects falling from heights, and cannot meet the fall prevention requirements for tools during disassembly and assembly work.

[0004] US Patent 20180070713A1 discloses a fall protection device and system for hand tools, including a fall protection anchor having an anchor body with a proximal body end portion, an intermediate body portion, and a distal body end portion, a guide hole through the proximal body end portion, a first tool hole through the intermediate body portion, and a second tool hole through the distal body end portion. The fall protection anchor is securely attached to the hand tool, and one of the first or second tool holes is configured for attaching a tool tether connector, and the other is configured for attaching a tool holder connector for a tool pouch, such that one of the tool tether connector or the tool holder connector is always directly and securely connected to the fall protection anchor. However, this fall protection device is a general-purpose fall protection system and is not suitable for heavy / high-risk environments. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology, such as failure to meet the requirements of the high-risk environment of nuclear power plants, impact on operation, low reliability of fall prevention measures, and risk of objects falling, and to provide a fall prevention tool for operating the gate switch of equipment in nuclear power plant reactor building, which improves the operation process and efficiency, enhances safety and environmental adaptability, and makes it suitable for the high-risk environment requirements of nuclear power plants.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A fall protection tool for operating gate switches in nuclear power plant reactor building equipment, used to prevent wrenches and sockets from falling, wherein the socket is provided with an annular groove; the fall protection tool includes:

[0008] An open-type retaining ring that matches the annular groove of the sleeve and can slide freely within the annular groove includes a retaining ring body and an opening;

[0009] And a wire rope with one end connected to both ends of the opening of the open-type retaining ring and the other end looped around the wrench.

[0010] Furthermore, the angle of the opening is 15° to 60°, and the sum of the angles of the retaining ring body and the opening is 360°.

[0011] Furthermore, the open-type retaining ring is fitted with the annular groove with a clearance, allowing the open-type retaining ring to slide freely along the annular groove.

[0012] Furthermore, the sliding degree of freedom of the open-type retaining ring is configured to uniformly distribute the impact force along the sleeve axis.

[0013] Furthermore, the clearance fit tolerance between the open retaining ring and the annular groove is 0.05 to 0.2 mm.

[0014] Furthermore, the width of the open retaining ring is 0.05 to 5 mm smaller than the width of the annular groove.

[0015] Furthermore, two parallel connecting pieces are fixed at both ends of the opening of the open-type retaining ring.

[0016] Furthermore, the connecting piece is provided with a through hole for the steel wire rope to pass through.

[0017] Furthermore, the wire rope is provided with a first wire rope buckle that connects its two ends to the body to form an adjustable first wire rope loop and a second wire rope buckle that allows for adjustment of the size of the second wire rope loop.

[0018] Furthermore, the size of the first wire rope loop can be adjusted by the first wire rope buckle, which can be used to adjust the tightness of the connection between the wire rope and the open retaining ring, and can also adjust the opening size of the open retaining ring, thereby adjusting the speed at which the open retaining ring slides on the annular groove.

[0019] Furthermore, the size of the first wire rope loop can be adjusted by the second wire rope buckle, which can be used to accommodate different wrench handle sizes and prevent them from falling.

[0020] Furthermore, the first wire rope loop passes through both ends of the opening of the open-type retaining ring, and the second wire rope loop is fitted around the handle of the wrench.

[0021] Furthermore, the surface of the wire rope is coated with an anti-wear coating.

[0022] Furthermore, the coating component is polytetrafluoroethylene or a ceramic composite material.

[0023] Furthermore, the open-type retaining ring is made of 65Mn spring steel.

[0024] Furthermore, the wire rope is made of 06Cr19Ni10 stainless steel.

[0025] Furthermore, the first and second wire rope clips are made of aluminum.

[0026] Furthermore, the first and second wire rope clips are aluminum press-fit clips with a pressing strength ≥ 90% of the wire rope breaking strength.

[0027] Furthermore, the sleeve is a 46mm heavy-duty sleeve, and its annular groove has a depth of ≥2mm and a width of ≥3mm.

[0028] Furthermore, the wrench is a ratchet wrench or a torque wrench.

[0029] Furthermore, the operation method of the fall protection tool includes the following steps:

[0030] The open-type retaining ring is embedded into the annular groove of the sleeve;

[0031] Connect one end of the wire rope to both ends of the opening of the open-type retaining ring, and loop the other end around the wrench.

[0032] Furthermore, before using the sleeve, the sliding resistance of the open-type retaining ring in the annular groove is tested to ensure that its sliding resistance is ≤5N.

[0033] Furthermore, after using the fall arrestor, check the wear level on the surface of the wire rope. Replace the wire rope when the wear area exceeds 10% of the rope diameter to avoid hidden damage.

[0034] Furthermore, the working environment of the fall protection tool is -20℃ to 50℃, and it is resistant to contamination by lubricating oil and rust remover.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] (1) In this utility model, the open-type retaining ring is embedded in the annular groove of the sleeve, and allows the open-type retaining ring to slide freely in the annular groove, rather than being rigidly connected to the sleeve. When the gate is opened or closed, the wrench drives the sleeve to rotate, and the wire rope and the open-type retaining ring will not be wrapped and tightened, which hardly hinders the operation and ensures the smoothness and efficiency of the operation.

[0037] (2) In this utility model, the open-type retaining ring is embedded in the annular groove of the sleeve and allows the open-type retaining ring to slide freely in the annular groove. The wrench is always connected to the sleeve through the anti-fall tool. No matter what angle or position the sleeve is in, the anti-fall function is always effective, realizing protection during use, rather than protection when stationary.

[0038] (3) In this utility model, the open-type retaining ring is embedded in the annular groove of the sleeve and allows the open-type retaining ring to slide freely in the annular groove. This sliding freedom can evenly disperse the possible instantaneous impact force along the sleeve axis, avoid stress concentration, and improve the overall reliability of the system.

[0039] (4) Ordinary fall arresting gear may be made of ordinary steel or inappropriate materials, which are prone to corrosion, aging, and embrittlement in the environment of a nuclear power plant, where there is radiation, humidity, heat, and chemical reagents (lubricating oil, rust remover), leading to functional failure. This utility model uses 06Cr19Ni10 stainless steel wire rope and an open-type retaining ring made of 65Mn spring steel. 6Cr19Ni10 stainless steel provides excellent corrosion resistance and stability under radiation conditions, while 65Mn spring steel has high elasticity, high strength, and good fatigue resistance, ensuring that the retaining ring is not prone to plastic deformation or breakage after repeated installation, disassembly, and stress.

[0040] (5) The present invention coats the surface of the wire rope with polytetrafluoroethylene or ceramic anti-wear coating, which greatly reduces the frictional loss between the wire rope and the connecting piece, the first wire rope buckle and the second wire rope buckle, extends the service life and avoids the hidden risks caused by wear and breakage.

[0041] (6) This utility model forms an adjustable first wire rope loop and a second wire rope loop through a first wire rope clip and a second wire rope clip. Adjusting the tightness of the connection between the first wire rope loop and the open-type retaining ring indirectly fine-tunes the size of the opening of the open-type retaining ring, thereby precisely controlling the sliding damping of the retaining ring within the groove, achieving secondary adjustment. Furthermore, it can connect the open-type retaining ring and the sleeve to prevent them from separating and falling. Adjusting the second wire rope loop allows for adaptation to handles of different thicknesses and shapes, providing strong versatility. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the fall protection tool shown in Example 2;

[0043] Figure 2 This is a schematic diagram of the sleeve structure shown in Example 2;

[0044] Figure 3 This is a schematic diagram of the ratchet wrench shown in Example 2.

[0045] Explanation of markings in the diagram:

[0046] 1-Wrench;

[0047] 2-Sleeve, 21-Annular groove;

[0048] 3- Fall protection tool, 31- Open-type retaining ring, 311- Retaining ring body, 312- Opening, 32- Steel wire rope, 33- Connecting piece, 331- Through hole, 34- First steel wire rope buckle, 341- First steel wire rope loop, 35- Second steel wire rope buckle, 351- Second steel wire rope loop. Detailed Implementation

[0049] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. In the following embodiments or examples, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0050] It should be noted that in the description of this utility model, the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] A fall protection tool for operating gate switches in a nuclear power plant reactor building, used to prevent a wrench 1 and a socket 2 from falling, wherein the socket 2 is provided with an annular groove 21; the fall protection tool 3 includes:

[0053] An open-type retaining ring 31 that matches the annular groove 21 of the sleeve 2 and can be freely slidable within the annular groove 21 includes a retaining ring body 311 and an opening 312.

[0054] And a wire rope 32, one end of which is connected to both ends of the opening 312 of the open-type retaining ring 31, and the other end of which is looped around the wrench 1.

[0055] In some specific embodiments, the angle of the opening 312 is 15° to 60°, and the sum of the angles of the retaining ring body 311 and the opening 312 is 360°.

[0056] In some specific embodiments, the open-type retaining ring 31 is clearance-fitted with the annular groove 21, allowing the open-type retaining ring 31 to slide freely along the annular groove 21.

[0057] In some specific embodiments, the sliding degree of freedom of the open retaining ring 31 is configured to uniformly distribute the impact force along the axial direction of the sleeve 2.

[0058] In some specific embodiments, the clearance fit tolerance between the open retaining ring 31 and the annular groove 21 is 0.05 to 0.2 mm.

[0059] In some specific embodiments, the width of the open retaining ring 31 is 0.05 to 5 mm smaller than the width of the annular groove 21.

[0060] In some specific embodiments, two parallel connecting pieces 33 are fixed at both ends of the opening 312 of the open-type retaining ring 31.

[0061] In some specific embodiments, the connecting piece 33 is provided with a through hole 331 for the steel wire rope 32 to pass through.

[0062] In some specific embodiments, the wire rope 32 is provided with a first wire rope buckle 34 that connects its two ends to the body to form an adjustable first wire rope loop 341 and a second wire rope buckle 35 that can adjust the size of a second wire rope loop 351.

[0063] In some specific embodiments, the size of the first wire rope loop 341 can be adjusted by the first wire rope buckle 34, which can be used to adjust the tightness of the connection between the wire rope 32 and the open retaining ring 31, and can also adjust the size of the opening 312 of the open retaining ring 31, thereby adjusting the speed at which the open retaining ring 31 slides on the annular groove 21.

[0064] In some specific embodiments, the size of the first wire rope loop 351 can be adjusted by the second wire rope buckle 35, which can be used to accommodate different handle sizes of the wrench 1 and prevent it from falling.

[0065] In some specific embodiments, the first wire rope loop 341 passes through both ends of the opening 312 of the open retaining ring 31, and the second wire rope loop 351 is fitted around the handle of the wrench 1.

[0066] In some specific embodiments, the surface of the wire rope 32 is coated with an anti-wear coating.

[0067] In some specific embodiments, the coating component is polytetrafluoroethylene or a ceramic composite material.

[0068] In some specific embodiments, the open-type retaining ring 31 is made of 65Mn spring steel.

[0069] In some specific embodiments, the steel wire rope 32 is made of 06Cr19Ni10 stainless steel.

[0070] In some specific embodiments, the first wire rope clip 34 and the second wire rope clip 35 are made of aluminum.

[0071] In some specific embodiments, the first wire rope clip 34 and the second wire rope clip 35 are aluminum press-fit clips, and their pressing strength is ≥ 90% of the breaking strength of the wire rope 32.

[0072] In some specific embodiments, the sleeve 2 is a 46mm heavy-duty sleeve, and its annular groove 21 has a depth ≥2mm and a width ≥3mm.

[0073] In some specific embodiments, the wrench 1 is a ratchet wrench or a torque wrench.

[0074] In some specific embodiments, the operation method of the fall protection tool includes the following steps:

[0075] The open-type retaining ring 31 is embedded into the annular groove 21 of the sleeve 2;

[0076] One end of the wire rope 32 is connected to both ends of the opening 312 of the open-type retaining ring 31, and the other end is looped around the wrench 1.

[0077] In some specific embodiments, before the sleeve 2 is used, the sliding resistance of the open retaining ring 31 in the annular groove 21 is tested to ensure that its sliding resistance is ≤5N.

[0078] In some specific embodiments, after the fall arrestor 3 is used, the wear level of the steel wire rope 31 is checked. When the wear area exceeds 10% of the rope diameter, the steel wire rope 31 is replaced to avoid hidden damage problems.

[0079] In some specific embodiments, the working environment of the fall arrestor 3 is -20℃ to 50℃, and it is resistant to contamination by lubricating oil and rust remover.

[0080] Each of the above embodiments can be implemented individually or in any combination of two or more.

[0081] The following description uses specific examples to illustrate the point.

[0082] Example 1

[0083] A fall protection tool for operating gate switches in a nuclear power plant reactor building, used to prevent a wrench 1 and a socket 2 from falling, wherein the socket 2 is provided with an annular groove 21; the fall protection tool 3 includes:

[0084] An open-type retaining ring 31 that matches the annular groove 21 of the sleeve 2 and can be freely slidable within the annular groove 21 includes a retaining ring body 311 and an opening 312.

[0085] And a wire rope 32, one end of which is connected to both ends of the opening 312 of the open-type retaining ring 31, and the other end of which is looped around the wrench 1.

[0086] In this embodiment, the angle of the opening 312 is 30°, and the sum of the angles of the retaining ring body 311 and the opening 312 is 360°.

[0087] In this embodiment, the open-type retaining ring 31 is fitted with the annular groove 21 with a clearance, so that the open-type retaining ring 31 can slide freely along the annular groove 21.

[0088] In this embodiment, the sliding degree of freedom of the open-type retaining ring 31 is configured to uniformly distribute the impact force along the axial direction of the sleeve 2.

[0089] In this embodiment, the clearance fit tolerance between the open retaining ring 31 and the annular groove 21 is 0.1 mm.

[0090] In this embodiment, the width of the open retaining ring 31 is 1 mm smaller than the width of the annular groove 21.

[0091] In this embodiment, the wire rope 32 is provided with a first wire rope buckle 34 that connects its two ends to the body to form an adjustable first wire rope loop 341 and a second wire rope buckle 35 that can adjust the size of the second wire rope loop 351.

[0092] In this embodiment, the size of the first wire rope loop 341 can be adjusted by the first wire rope buckle 34, which can be used to adjust the tightness of the connection between the wire rope 32 and the open retaining ring 31, and can also adjust the size of the opening 312 of the open retaining ring 31, thereby adjusting the speed at which the open retaining ring 31 slides on the annular groove 21.

[0093] In this embodiment, the size of the first wire rope loop 351 can be adjusted by the second wire rope buckle 35, which can be used to accommodate different handle sizes of the wrench 1 and prevent it from falling.

[0094] In this embodiment, the first wire rope loop 341 passes through both ends of the opening 312 of the open retaining ring 31, and the second wire rope loop 351 is fitted around the handle of the wrench 1.

[0095] In this embodiment, the open-type retaining ring 31 is made of 65Mn spring steel.

[0096] In this embodiment, the steel wire rope 32 is made of 06Cr19Ni10 stainless steel.

[0097] In this embodiment, the first wire rope clip 34 and the second wire rope clip 35 are made of aluminum.

[0098] In this embodiment, the first wire rope clip 34 and the second wire rope clip 35 are aluminum press-fit clips, and their pressing strength is ≥ 90% of the breaking strength of the wire rope 32.

[0099] In this embodiment, the sleeve 2 is a 46mm heavy-duty sleeve, and its annular groove 21 has a depth of 2mm and a width of 3mm.

[0100] In this embodiment, the operation method of the fall protection tool includes the following steps:

[0101] S1. Before using the sleeve 2, test the sliding resistance of the open-type retaining ring 31 in the annular groove 21 to ensure that its sliding resistance is ≤5N.

[0102] S2. Embed the open-type retaining ring 31 into the annular groove 21 of the sleeve 2;

[0103] S3. Pass one end of the wire rope 32 through both ends of the opening 312 of the open retaining ring 31 in sequence, connect one end of the wire rope 32 to the body through the first wire rope buckle 34, and form a first wire rope loop 341 with adjustable size. Adjust the size of the first wire rope loop 341 through the first wire rope buckle 34 so that the open retaining ring 31 can slide freely in the annular groove 21.

[0104] S4. The other end of the wire rope 32 is connected to the body through the second wire rope buckle 35, forming a second wire rope loop 351 with an adjustable size. First, the second wire rope loop 351 is made to have a larger inner diameter, and it passes through the head of the wrench 1 so that it is located at the handle. Then, the second wire rope loop 351 is tightened to adapt to the handle size of the wrench 1. At this time, the fall protection tool 3 connects the wrench 1 and the socket 2.

[0105] S4. Use the wrench 1, socket 2, and fall arrestor 3 to operate the gate switches of the nuclear power plant reactor building equipment.

[0106] In this embodiment, after the fall protection tool 3 is used, the wear level of the steel wire rope 31 is checked. When the wear area exceeds 10% of the rope diameter, the steel wire rope 31 is replaced to avoid hidden damage problems.

[0107] In this embodiment, the working environment of the fall protection tool 3 is -20℃ to 50℃, and it is resistant to contamination by lubricating oil and rust remover.

[0108] Example 2

[0109] like Figures 1-3 As shown, a fall protection tool for operating the gate switch of equipment in a nuclear power plant reactor building is provided to prevent the wrench 1 and socket 2 from falling. The socket 2 is provided with an annular groove 21. The fall protection tool 3 includes:

[0110] An open-type retaining ring 31 that matches the annular groove 21 of the sleeve 2 and can be freely slidable within the annular groove 21 includes a retaining ring body 311 and an opening 312.

[0111] And a wire rope 32, one end of which is connected to both ends of the opening 312 of the open-type retaining ring 31, and the other end of which is looped around the wrench 1.

[0112] In this embodiment, the angle of the opening 312 is 30°, and the sum of the angles of the retaining ring body 311 and the opening 312 is 360°.

[0113] In this embodiment, the open-type retaining ring 31 is fitted with the annular groove 21 with a clearance, so that the open-type retaining ring 31 can slide freely along the annular groove 21.

[0114] In this embodiment, the sliding degree of freedom of the open-type retaining ring 31 is configured to uniformly distribute the impact force along the axial direction of the sleeve 2.

[0115] In this embodiment, the clearance fit tolerance between the open retaining ring 31 and the annular groove 21 is 0.1 mm.

[0116] In this embodiment, the width of the open retaining ring 31 is 1 mm smaller than the width of the annular groove 21.

[0117] In this embodiment, two parallel connecting pieces 33 are fixed at both ends of the opening 312 of the open-type retaining ring 31.

[0118] In this embodiment, the connecting piece 33 is provided with a through hole 331 for the steel wire rope 32 to pass through.

[0119] In this embodiment, the wire rope 32 is provided with a first wire rope buckle 34 that connects its two ends to the body to form an adjustable first wire rope loop 341 and a second wire rope buckle 35 that can adjust the size of the second wire rope loop 351.

[0120] In this embodiment, the size of the first wire rope loop 341 can be adjusted by the first wire rope buckle 34, which can be used to adjust the tightness of the connection between the wire rope 32 and the open retaining ring 31, and can also adjust the size of the opening 312 of the open retaining ring 31, thereby adjusting the speed at which the open retaining ring 31 slides on the annular groove 21.

[0121] In this embodiment, the size of the first wire rope loop 351 can be adjusted by the second wire rope buckle 35, which can be used to accommodate different handle sizes of the wrench 1 and prevent it from falling.

[0122] In this embodiment, the first wire rope loop 341 passes through both ends of the opening 312 of the open retaining ring 31, and the second wire rope loop 351 is fitted around the handle of the wrench 1.

[0123] In this embodiment, the open-type retaining ring 31 is made of 65Mn spring steel.

[0124] In this embodiment, the steel wire rope 32 is made of 06Cr19Ni10 stainless steel.

[0125] In this embodiment, the first wire rope clip 34 and the second wire rope clip 35 are made of aluminum.

[0126] In this embodiment, the first wire rope clip 34 and the second wire rope clip 35 are aluminum press-fit clips, and their pressing strength is ≥ 90% of the breaking strength of the wire rope 32.

[0127] In this embodiment, the sleeve 2 is a 46mm heavy-duty sleeve, and its annular groove 21 has a depth of 2mm and a width of 3mm.

[0128] In this embodiment, the operation method of the fall protection tool includes the following steps:

[0129] S1. Before using the sleeve 2, test the sliding resistance of the open-type retaining ring 31 in the annular groove 21 to ensure that its sliding resistance is ≤5N.

[0130] S2. Embed the open-type retaining ring 31 into the annular groove 21 of the sleeve 2;

[0131] S3. Pass one end of the wire rope 32 through the through holes 331 of the two connecting pieces 33 in sequence, connect one end of the wire rope 32 to the body through the first wire rope buckle 34, and form a first wire rope loop 341 with adjustable size. Adjust the size of the first wire rope loop 341 through the first wire rope buckle 34 so that the open retaining ring 31 can slide freely in the annular groove 21.

[0132] S4. The other end of the wire rope 32 is connected to the body through the second wire rope buckle 35, forming a second wire rope loop 351 with an adjustable size. First, the second wire rope loop 351 is made to have a larger inner diameter, and it passes through the head of the wrench 1 so that it is located at the handle. Then, the second wire rope loop 351 is tightened to adapt to the handle size of the wrench 1. At this time, the fall protection tool 3 connects the wrench 1 and the socket 2.

[0133] S4. Use the wrench 1, socket 2, and fall arrestor 3 to operate the gate switches of the nuclear power plant reactor building equipment.

[0134] In this embodiment, after the fall protection tool 3 is used, the wear level of the steel wire rope 31 is checked. When the wear area exceeds 10% of the rope diameter, the steel wire rope 31 is replaced to avoid hidden damage problems.

[0135] In this embodiment, the working environment of the fall protection tool 3 is -20℃ to 50℃, and it is resistant to contamination by lubricating oil and rust remover.

[0136] During a major overhaul of the nuclear island at a nuclear power plant, this fall protection tool was applied to the opening and closing operations of the nuclear island equipment gates. The use of this fall protection tool effectively reduced operational risks and achieved the expected results. The evaluation is as follows:

[0137] 1. The anti-fall tool 3 in this embodiment has sufficient structural stability to withstand the impact of a heavy sleeve falling.

[0138] 2. In this embodiment, the fall protection tool 3 can be easily and reliably connected to the heavy-duty sleeve 2 without affecting the normal function of the sleeve 2.

[0139] 3. The fall protection tool 3 in this embodiment can be connected to various torque wrenches and ratchet wrenches, and has strong compatibility.

[0140] Example 3

[0141] This embodiment is based on embodiment 2, wherein the surface of the steel wire rope 32 is coated with an anti-wear coating, and the coating component is polytetrafluoroethylene.

[0142] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A fall protection tool for operating gate switches in nuclear power plant reactor building equipment, characterized in that, For preventing the wrench (1) and socket (2) from falling, the socket (2) is provided with an annular groove (21); the anti-fall tool (3) includes: An open-type retaining ring (31) that matches the annular groove (21) of the sleeve (2) and can be freely slidable within the annular groove (21) includes a retaining ring body (311) and an opening (312). And a wire rope (32) with one end connected to both ends of the opening (312) of the open-type retaining ring (31) and the other end looped around the wrench (1).

2. The fall protection tool for operating the gate switch of nuclear power plant reactor building equipment according to claim 1, characterized in that, The angle of the opening (312) is 15° to 60°, and the sum of the angles of the retaining ring body (311) and the opening (312) is 360°.

3. The fall protection tool for operating the gate switch of nuclear power plant reactor building equipment according to claim 1, characterized in that, The open-type retaining ring (31) is clearance-fitted with the annular groove (21).

4. The fall protection tool for operating the gate switch of nuclear power plant reactor building equipment according to claim 3, characterized in that, The clearance fit tolerance of the open retaining ring (31) and the annular groove (21) is 0.05 to 0.2 mm.

5. The fall protection tool for operating the gate switch of nuclear power plant reactor building equipment according to claim 1, characterized in that, The width of the open retaining ring (31) is 0.05 to 5 mm smaller than the width of the annular groove (21).

6. The fall protection tool for operating the gate switch of nuclear power plant reactor building equipment according to claim 1, characterized in that, The open-type retaining ring (31) has two parallel connecting pieces (33) fixed at both ends of the opening (312).

7. A fall protection tool for operating gate switches in nuclear power plant reactor building equipment according to claim 6, characterized in that, The connecting piece (33) is provided with a through hole (331) for the steel wire rope (32) to pass through.

8. The fall protection tool for operating the gate switch of nuclear power plant reactor building equipment according to claim 1, characterized in that, The wire rope (32) is provided with a first wire rope buckle (34) that connects its two ends to the body to form an adjustable first wire rope loop (341) and a second wire rope buckle (35) that adjusts the size of the second wire rope loop (351).

9. A fall protection tool for operating gate switches in nuclear power plant reactor building equipment according to claim 8, characterized in that, The first wire rope loop (341) passes through both ends of the opening (312) of the open retaining ring (31), and the second wire rope loop (351) is fitted onto the handle of the wrench (1).

10. A fall protection tool for operating gate switches in nuclear power plant reactor building equipment according to claim 1, characterized in that, The surface of the wire rope (32) is coated with an anti-wear coating.

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