Execution terminal for replacing bolts of reactor coaming

Abstract

The invention belongs to the field of reactor coaming bolt replacement, and particularly relates to an execution tail end for reactor coaming bolt replacement, the execution tail end comprises an EDM machining tail end and a rotary operation tail end, the EDM machining tail end is used for replacing an EDM electrode, and bolt locking pins at different angles are cut off through the EDM electrode; the rotating operation tail end is used for replacing the rotating operation tail end tool head, and the bolt is replaced through the rotating operation tail end tool head. According to the invention, automatic underwater replacement of the EDM machining tail end electrode and the rotary operation tail end tool head is realized, and the replacement efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of reactor coaming bolt replacement, and in particular relates to an execution end for replacing reactor coaming bolts. Background Art

[0002] The coaming bolts of the lower internal components of M310 and CPR1000 nuclear power units may deteriorate due to radiation-assisted stress corrosion cracking, preload loss, thermonuclear radiation embrittlement, high-cycle fatigue / unlocking / overload, steady-state pressure gradient on the baffle, etc. The deterioration of the bolts directly affects the safety of the nuclear power unit, so the deteriorated coaming bolts need to be replaced. There are countersunk holes and threaded holes on the coaming and the forming plate. Figure 7 As shown, the threaded hole is Figure 8 As shown, the enclosure and the formed plate are connected by enclosure bolts. Fig. 9 As shown. After the bolt is screwed into the threaded hole, a locking key will be welded in the upper groove to prevent loosening. The current process for replacing the baffle bolts is to first use special tools to remove the weld and locking key of the bolt to be replaced, then remove it, install new baffle bolts, and finally prevent loosening. This repair process has complex procedures, involving multiple action requirements and multiple tool heads; long underwater distances, and high radioactive doses. Different bolt replacements require different tool heads. Manually replacing the tool head underwater is difficult to achieve due to factors such as long distances and high radioactivity.

[0003] The current method of replacing the tool head is to transport it out of the water and then replace it. This replacement method has many steps, slow speed and high labor costs. When the failure rate of bolts in reactor equipment is very high, this rate of removing the baffle bolts will increase a lot of time and labor costs. Summary of the invention

[0004] The purpose of the present invention is to provide an execution end for replacing reactor coaming bolts, which realizes the automatic replacement of EDM processing end electrode and rotating operation end tool head underwater, thereby improving the replacement efficiency.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] An execution end for replacing reactor coaming bolts comprises an EDM processing end and a rotating operation end. The EDM processing end is used to replace the EDM electrode, and the bolt locking pins at different angles are cut off by the EDM electrode; the rotating operation end is used to replace the rotating operation end tool head, and the bolts are replaced by the rotating operation end tool head.

[0007] The EDM processing end includes: a linear drive module A, a rotary drive motor, a transmission gear A, an EDM electrode clamping mechanism, and an EDM electrode; the linear drive module A is connected to the EDM electrode clamping mechanism and is used to drive the EDM electrode clamping mechanism to move axially; the rotary drive motor is drivingly connected to the transmission gear A, the transmission gear A is connected to the EDM electrode clamping mechanism, the EDM electrode clamping mechanism is detachably connected to the EDM electrode, the rotary drive motor drives the transmission gear A to drive the EDM electrode clamping mechanism to rotate, so that the EDM processing end has different working angles after replacing the EDM electrode, and can cut off bolt locking pins at different angles.

[0008] The linear drive module A includes a drive motor and a linear track. The drive motor is connected to the EDM electrode clamping mechanism to provide driving force for the EDM electrode clamping mechanism. The linear track is slidably connected to the EDM electrode clamping mechanism to enable the EDM electrode clamping mechanism to achieve axial movement during operation.

[0009] The EDM electrode clamping mechanism includes: a cylinder A, a base A, a plastic connector, a compression spring, and an electrode chuck. The cylinder A is arranged at one end of the base A. The cylinder A and the electrode chuck are connected through the plastic connector. The electrode chuck is pulled by the cylinder A to achieve the open state of the electrode chuck. When the cylinder is cut off, the electrode chuck is pressed by the compression spring to achieve the clamping state of the electrode chuck.

[0010] The EDM electrodes include: locking pin cutting electrodes, broken wire center hole processing electrodes, threaded hole enlargement electrodes, and enclosure plate new countersunk hole processing electrodes.

[0011] The rotary working end includes: a linear drive module B, a high-speed hydraulic torque wrench, a transmission gear B, a tool head clamping mechanism, and a tool head; the linear drive module B is connected to the tool head clamping mechanism and is used to drive the tool head clamping mechanism to move axially; the high-speed hydraulic torque wrench is drivingly connected to the transmission gear B, the transmission gear B is connected to the tool head clamping mechanism, the tool head clamping mechanism is detachably connected to the tool head, and the high-speed hydraulic torque wrench drives the transmission gear B to drive the tool head clamping mechanism to rotate together with the tool head.

[0012] The tool head clamping mechanism comprises: a cylinder B and a base B. The cylinder B is arranged at one end of the base B and is connected to the tool head chuck. The tool head chuck is pulled by the cylinder B to realize the clamping state or the opening state of the tool head chuck.

[0013] The tool heads include: screw hole processing taps, prototype bolt disassembly tool heads, broken wire removal tool heads, new bolt assembly and disassembly tool heads, thread cleaning tool heads, and new bolt expansion and anti-loosening tool heads.

[0014] The prototype bolt disassembly and assembly tool head includes: a core rod, a spring, a sliding rod, an outer sleeve, and an inner sleeve; the core rod is fixedly connected to the outer sleeve, the inner sleeve and the core rod are connected in a spline style, the inner sleeve can slide in the outer sleeve, the sliding rod passes through the long hole of the outer sleeve and is connected to the inner sleeve to limit its travel range, and a spring is provided between the raised end face of the core rod and the sliding rod.

[0015] The beneficial technical effects of the present invention are:

[0016] 1. The execution end for replacing reactor panel bolts provided by the present invention includes an EDM processing end and a rotating operation end. Different electrodes and tool heads can be replaced to complete all actions in the maintenance process and emergency disposal such as cutting, rotating and feeding actions in bolt replacement and related repair operations; underwater automatic replacement is realized, with a high degree of automation and high repair efficiency.

[0017] 2. The execution end for replacing reactor shroud bolts provided by the present invention realizes mechanical expansion and anti-loosening after the new bolts are installed through axial operation, and the operation is simple and reliable.

[0018] 3. In the execution terminal for replacing reactor panel bolts provided by the present invention, the EDM processing terminal adopts EDM processing, which not only has a small processing reaction force and low requirements on the bearing capacity of the positioning platform; but also has a strong processing capacity and can flexibly handle emergency situations during the repair process.

[0019] 4. In the execution terminal for replacing the bolts of the reactor shroud provided by the present invention, the EDM processing terminal has axial feeding and rotation functions, and can control the cutting electrode angle of the locking pin in conjunction with the encoder and the 0-point position switch. The driving motors all adopt an inflatable underwater sealing structure design with good sealing performance. The tool materials are mainly aluminum alloy, stainless steel, etc., which meet the use requirements of nuclear power plants.

[0020] 5. In an execution terminal for replacing reactor panel bolts provided by the present invention, the rotating operation terminal controls the pressure through a pressure controller or a hydraulic pump station to achieve precise control of the wrench torque; driven by a high-performance water hydraulic motor, the wrench can operate continuously without impact, thereby improving work efficiency, and there are no electronic components at the front end, so it has better radiation resistance; water hydraulics are used to drive the wrench to avoid hydraulic oil contaminating the water quality of the pool; a precision planetary gear structure is used, which is small in size and light in weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of an EDM processing end in an execution end for replacing reactor coaming bolts provided by the present invention;

[0022] Figure 2A schematic diagram of the structure of a rotating operation end in an execution end for replacing reactor coaming bolts provided by the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the EDM electrode clamping mechanism in the EDM processing end of the present invention;

[0024] Figure 4 This is a schematic diagram of the EDM electrode structure in the EDM processing end of the present invention;

[0025] Figure 5 This is a schematic diagram of the tool head structure in the rotary operation end of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the prototype bolt disassembling tool head in the rotary operation end of the present invention;

[0027] Figure 7 This is a schematic diagram of the countersunk hole structure of the enclosure;

[0028] Figure 8 It is a schematic diagram of the threaded hole structure of the forming plate;

[0029] Fig. 9 Schematic diagram of the bolt structure of the enclosure.

[0030] In the figure: 1-1, linear drive module A; 1-2, rotary drive motor; 1-3, cylinder A; 1-4, base A; 1-5, plastic connector; 1-6, insulating sleeve; 1-7, EDM electrode clamping mechanism; 1-8, EDM electrode; 1-8-1, new countersunk hole processing electrode; 1-8-2, threaded hole expansion electrode; 1-8-3, locking pin cutting electrode; 1-8-4, broken wire center hole processing electrode; 1-9, transmission gear A; 1-10, spring pressure cover; 1-11, sleeve; 1-12, compression spring; 1-13, electrode chuck; 1-14, limit sleeve; 1-15, bearing; 1-16, bearing end cover; 2-1, linear drive module Block B; 2-2, high-speed hydraulic torque wrench; 2-3, cylinder B; 2-4, base B; 2-5, tool head clamping mechanism; 2-6, tool head; 2-6-1, screw hole processing tap; 2-6-2, prototype bolt disassembly tool head; 2-6-3, broken wire removal tool head; 2-6-4, new bolt assembly and disassembly tool head; 2-6-5, thread cleaning tool head; 2-6-6, new bolt expansion and anti-loosening tool head; 2-7, transmission gear B; 3-1, core rod; 3-2, spring; 3-3, sliding rod; 3-4, outer sleeve; 3-5, inner sleeve 4-1M-type hole; 4-2, N-type hole; 4-3, L-type hole; 5-1, prototype bolt; 5-2, new bolt. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0032] The present invention provides an execution end for replacing reactor panel bolts, comprising an EDM processing end and a rotating operation end. The EDM processing end is used to replace the EDM electrode, and the bolt locking pins at different angles are cut off by the EDM electrode; the rotating operation end is used to replace the rotating operation end tool head, and the bolts are replaced by the rotating operation end tool head.

[0033] The panel bolts include the new bolts 5-2 and the prototype bolts 5-1, such as Fig. 9 As shown. There are three types of threaded holes: M type, N type and L type. Figure 8 As shown. Different bolt holes and different damage conditions require different tool heads. The EDM processing end and the rotary operation end are transported to the tool head storage through the end loading platform, and the tool head is selected according to the type of bolt to be replaced. First, replace the tool head, then move to the tool head to be installed, install the new tool head through the cooperation of the positioning system, and finally use the tool head to replace the bolt. Realize the automatic replacement of the tool head in the underwater working environment and complete the bolt replacement.

[0034] like Figure 1 As shown, the EDM processing end includes: a linear drive module A1-1, a rotary drive motor 1-2, a transmission gear A1-9, an EDM electrode clamping mechanism 1-7, and an EDM electrode 1-8.

[0035] The linear drive module A1-1 is connected to the EDM electrode clamping mechanism 1-7 and is used to drive the EDM electrode clamping mechanism 1-7 to move axially.

[0036] The rotary drive motor 1-2 is connected to the transmission gear A1-9, the transmission gear A1-9 is connected to the EDM electrode clamping mechanism 1-7, the EDM electrode clamping mechanism 1-7 is detachably connected to the EDM electrode 1-8, the rotary drive motor 1-2 drives the transmission gear A1-9 to drive the EDM electrode clamping mechanism 1-7 to rotate, so that the EDM processing end has different working angles after replacing the EDM electrode 1-8, and can cut off bolt locking pins at different angles.

[0037] The linear drive module A1-1 includes a drive motor and a linear track. The drive motor is connected to the EDM electrode clamping mechanism 1-7 to provide driving force for the EDM electrode clamping mechanism 1-7. The linear track is slidably connected to the EDM electrode clamping mechanism 1-7 to enable the EDM electrode clamping mechanism 1-7 to achieve axial movement during operation.

[0038] like Figure 3As shown, the EDM electrode clamping mechanism 1-7 includes: a cylinder A1-3, a base A1-4, a plastic connector 1-5, an insulating sleeve 1-6, a spring pressure cover 1-10, a sleeve 1-11, a compression spring 1-12, an electrode chuck 1-13, a limiting sleeve 1-14, a bearing 1-15, and a bearing end cover 1-16.

[0039] The cylinder A1-3 is arranged at one end of the base A1-4, and the cylinder A1-3 is connected to the electrode chuck 1-13 through the plastic connector 1-5; the sleeve 1-11 and the bearing 1-15 are arranged on the outer surface of the limiting sleeve 1-14 to fix the position of the limiting sleeve 1-14, and the bearing end cover 1-16 and the insulating sleeve 1-6 are arranged on the outer side of the bearing 1-15. The bearing end cover 1-16 is used to fix the bearing 1-15, adjust the clearance of the bearing 1-15 and withstand the axial force. The insulating sleeve 1-6 can prevent the corrosion of the bearing 1-15 by the current and protect the safety of the equipment. The compression spring 1-12 is arranged in the limiting sleeve 1-14, and the two ends respectively support the limiting sleeve 1-14 and the electrode chuck 1-13, and the spring pressure cover 1-10 cooperates with the limiting sleeve 1-14 to withstand the force of the compression spring 1-12.

[0040] The EDM electrode clamping mechanism 1-7 clamps the EDM electrode 1-8 through a telescopic expansion structure, and a compression spring 1-12 is inside the mechanism to keep the electrode chuck 1-13 in a long-term clamping state, ensuring that the EDM electrode 1-8 will not fall off in the event of a gas or power outage. When replacing the EDM electrode 1-8, the cylinder A1-3 pulls the electrode chuck 1-13 of the EDM electrode clamping mechanism 1-7 to open it.

[0041] According to the functional requirements of the EDM processing end, EDM electrodes 1-8 mainly have 4 styles, such as Figure 4 As shown, they are locking pin cutting electrode 1-8-3, broken wire center hole processing electrode 1-8-4, threaded hole enlargement electrode 1-8-2, and enclosure plate new countersunk hole processing electrode 1-8-1. Among them, the locking pin cutting electrode 1-8-3 has a cutting edge on its head, which is responsible for completing the cutting of the locking pin and the weld; the broken wire center hole processing electrode 1-8-4 has a slender cylindrical head, and its length exceeds the processing depth so that it can be stably fixed during processing. It is responsible for completing the processing of the broken wire center hole, which is convenient for the subsequent removal of the broken wire; the threaded hole expansion electrode 1-8-2 has a stepped cylindrical head, and the diameter of the bottom will be larger than the diameter of the threaded hole to be expanded to ensure that the expanded aperture reaches the target size. It is responsible for completing the expansion and lengthening of the countersunk holes, light holes of the enclosure and the light holes and bottom holes of the forming plate, and can simultaneously complete the removal of stuck bolts, broken wires and defective threads; the new countersunk hole processing electrode 1-8-1 for the enclosure has a special countersunk part on its head to meet the processing requirements of the countersunk holes. It is responsible for completing the processing of the new countersunk holes of the enclosure, which is convenient for subsequent expansion and loosening prevention.

[0042] like Figure 2As shown, the rotary operation end includes: a linear drive module B2-1, a high-speed hydraulic torque wrench 2-2, a transmission gear B1-9, a tool head clamping mechanism 2-5, and a tool head 2-6.

[0043] The linear drive module B2-1 is connected to the tool head clamping mechanism 2-5 and is used to drive the tool head clamping mechanism 2-5 to move axially.

[0044] The high-speed hydraulic torque wrench 2-2 is connected to the transmission gear B1-9, which is connected to the tool head clamping mechanism 2-5, and the tool head clamping mechanism 2-5 is detachably connected to the tool head 2-6. The high-speed hydraulic torque wrench 2-2 drives the transmission gear B1-9 to drive the tool head clamping mechanism 2-5 to rotate together with the tool head 2-6. The pressure is controlled by the pressure controller or the hydraulic pump station to achieve precise control of the torque of the high-speed hydraulic torque wrench 2-2, so that the rotating operation end has the ability to automatically adjust the torque after the tool head is replaced. The working principle of the linear drive module B2-1 and the tool head clamping mechanism 2-5 is the same as that of the EDM processing end.

[0045] The tool head clamping mechanism 2-5 includes: a base B2-4 and a cylinder B2-3. The cylinder B2-3 is arranged at one end of the base B2-4. The cylinder B2-3 is connected to the tool head chuck. The tool head chuck is pulled by the cylinder B2-3 to realize the clamping state or the opening state of the tool head chuck.

[0046] According to the functional requirements of the rotary operation end, there are mainly 6 types of rotary operation end tool heads 2-6, such as Figure 5As shown, they are prototype bolt disassembly tool head 2-6-2, broken wire removal tool head 2-6-3, screw hole processing tap 2-6-1, thread cleaning tool head 2-6-5, new bolt assembly and disassembly tool head 2-6-4, and new bolt expansion and anti-loosening tool head 2-6-6. The head of the prototype bolt disassembly tool head 2-6-2 can match the size of the prototype bolt, and the spring in the middle can realize the feeding movement of the head, which is responsible for grabbing one prototype bolt and completing the assembly and disassembly. When the prototype bolt disassembly tool head 2-6-2 grabs the bolt, first align the inner sleeve with the hexagonal head of the bolt, and then press the bolt head into the front end hook of the outer sleeve through axial feeding. Under the action of the spring, the bolt head and the front end hook of the outer sleeve are pressed tightly to prevent it from falling, thereby completing the bolt grabbing; the head of the broken wire removal tool head 2-6-3 is composed of a circle of closely arranged spiral metal sheets, which can pass through the remaining parts of the broken screws or bolts, and is responsible for completing the removal of broken wires and bolts; the head of the screw hole processing tap 2-6-1 is composed of a series of alternating sharp teeth, presenting a spiral shape, which can guide the chips away from the processing area and help the tap remain stable. The thread of the spiral body It matches the standard of the thread to ensure that the manufactured thread meets the specifications and is responsible for completing the thread expansion processing of the bottom hole of the forming plate; the head of the thread cleaning tool head 2-6-5 is composed of a circle of closely arranged brushes, which is responsible for completing the cleaning of the threaded hole; the structural principle of the new bolt installation and removal tool head 2-6-4 is consistent with the prototype bolt installation and removal tool head 2-6-2, but the size has a certain change, which is responsible for grabbing 1 new bolt and completing the installation and removal; the head of the new bolt expansion and anti-loosening tool head 2-6-6 has a special expansion structure. When tightening the bolt, the expansion structure will expand and embed into the inner wall of the bolt hole, thereby increasing the anti-loosening effect, and is responsible for completing the expansion of the new bolt and realizing mechanical anti-loosening.

[0047] like Figure 6As shown, the prototype bolt disassembly tool head 2-6-2 includes: a core rod 3-1, a spring 3-2, a slide rod 3-3, an outer sleeve 3-4, and an inner sleeve 3-5. The core rod 3-1 is fixedly connected to the outer sleeve 3-4, the inner sleeve 3-5 is connected to the core rod 3-1 in a spline style, the inner sleeve 3-5 can slide in the outer sleeve 3-4, the slide rod 3-3 passes through the long hole of the outer sleeve 3-4 and is connected to the inner sleeve 3-5 to limit its travel range, and a spring 3-2 is provided between the raised end face of the core rod 3-1 and the slide rod 3-3. The structural principle of the new bolt disassembly tool head 2-6-4 is consistent with that of the prototype bolt disassembly tool head 2-6-2, and only the sizes of the inner and outer sleeves 3-4 are adjusted to adapt to the size. When the prototype bolt disassembly tool head 2-6-2 grabs a bolt, first align the inner sleeve 3-5 with the hexagonal head of the bolt, and then press the bolt head into the front end hook of the outer sleeve 3-4 through axial feeding. Under the action of the spring 3-2, the bolt head and the front end hook of the outer sleeve 3-4 are pressed tightly to prevent it from falling, thereby completing the bolt grabbing. When the prototype bolt disassembly tool head 2-6-2 discards a bolt, first move the tool head to the entrance of the discarded temporary storage container bolt, the tool head enters the long hole at the entrance, the tool head is axially retracted, the slide rod 3-3 contacts the inner wall of the entrance, restricts the movement of the inner sleeve 3-5, and the bolt is separated from the front end hook of the outer sleeve 3-4 by squeezing, thereby completing the bolt discarding work.

[0048] Using an execution end for replacing reactor coaming bolts provided by the present invention to replace EDM electrodes and tool heads specifically includes the following steps:

[0049] S1: Control the end-carrying platform to move the EDM processing end to above the existing EDM processing electrodes 1-8 target storage position on the EDM processing end;

[0050] S2: Align the outer flange of the EDM processing electrode 1-8 with the storage position groove through the visual assisted positioning system, and then the end carrying platform descends to control the EDM processing electrode 1-8 to enter the storage position;

[0051] S3: The cylinder 2-3 of the EDM electrode clamping mechanism is retracted, the chuck 1-13 is released, and the linear drive module 1-1 at the end of the EDM processing moves backward to separate from the EDM processing electrode 1-8;

[0052] S4: Control the end-carrying platform to move the EDM processing end to the target EDM processing electrode position;

[0053] S5: Through the visual assisted positioning system, the EDM machining end positioning pin is aligned with the target EDM machining electrode positioning hole, the cylinder A1-3 remains retracted, the chuck 1-13 is opened, and then the linear drive module 1-1 is fed, and the positioning pin enters the positioning hole until the EDM machining electrode connector is completely entered into the chuck 1-13;

[0054] S6: Cylinder A1-3 extends, and chuck 1-13 clamps EDM processing electrode 1-8;

[0055] S7: Control the end loading platform to rise, and then leave the EDM processing electrode storage position to complete the replacement;

[0056] S8: Align the replaced EDM processing electrode 1-8 with the bolt to be replaced and perform corresponding processing;

[0057] S9: Repeat the above steps and replace different tool heads for processing until the bolt replacement is completed;

[0058] S10: Because the tool head at the end of the rotating operation is consistent with the interface size of the EDM processing electrode, the tool head at the end of the rotating operation is automatically replaced to be consistent with the EDM processing end.

[0059] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. An execution end for replacing reactor coaming bolts, characterized in that: It includes an EDM processing end and a rotating operation end. The EDM processing end is used to replace the EDM electrode, and the bolt locking pins at different angles are cut off by the EDM electrode; the rotating operation end is used to replace the rotating operation end tool head, and the bolts are replaced by the rotating operation end tool head.

2. The execution end for replacing reactor shroud bolts according to claim 1, characterized in that: The EDM processing end comprises: a linear drive module A (1-1), a rotary drive motor (1-2), a transmission gear A (1-9), an EDM electrode clamping mechanism (1-7), and an EDM electrode (1-8); the linear drive module A (1-1) is connected to the EDM electrode clamping mechanism (1-7) and is used to drive the EDM electrode clamping mechanism (1-7) to move along the axial direction; the rotary drive motor (1-2) is drivingly connected to the transmission gear A (1-9), the transmission gear A (1-9) is connected to the EDM electrode clamping mechanism (1-7), the EDM electrode clamping mechanism (1-7) and the EDM electrode (1-8) are detachably connected, the rotary drive motor (1-2) drives the transmission gear A (1-9) to drive the EDM electrode clamping mechanism (1-7) to rotate, so that the EDM processing end has different working angles after the EDM electrode (1-8) is replaced, and bolt locking pins at different angles can be cut off.

3. The execution end for replacing reactor shroud bolts according to claim 2, characterized in that: The linear drive module A (1-1) comprises a drive motor and a linear track. The drive motor is connected to the EDM electrode clamping mechanism (1-7) to provide a driving force for the EDM electrode clamping mechanism (1-7). The linear track is slidably connected to the EDM electrode clamping mechanism (1-7) to enable the EDM electrode clamping mechanism (1-7) to achieve axial movement during operation.

4. The execution end for replacing reactor shroud bolts according to claim 2, characterized in that: The EDM electrode clamping mechanism (1-7) comprises: a cylinder A (1-3), a base A (1-4), a plastic connecting piece (1-5), a compression spring (1-12), and an electrode chuck (1-13); the cylinder A (1-3) is arranged at one end of the base A (1-4); the cylinder A (1-3) and the electrode chuck (1-13) are connected via the plastic connecting piece (1-5); the electrode chuck (1-13) is pulled by the cylinder A (1-3) to realize an open state of the electrode chuck (1-13); and when the cylinder (1-3) is de-energized, the electrode chuck (1-13) is pressed by the compression spring (1-12) to realize a clamped state of the electrode chuck (1-13).

5. The execution end for replacing reactor shroud bolts according to claim 2, characterized in that: The EDM electrodes (1-8) include: a locking pin cutting electrode (1-8-3), a broken wire center hole processing electrode (1-8-4), a threaded hole enlarging electrode (1-8-2), and a new type of countersunk hole processing electrode for the enclosure (1-8-1).

6. The execution end for replacing reactor shroud bolts according to claim 1, characterized in that: The rotary operation end comprises: a linear drive module B (2-1), a high-speed hydraulic torque wrench (2-2), a transmission gear B (1-9), a tool head clamping mechanism (2-5), and a tool head (2-6); the linear drive module B (2-1) is connected to the tool head clamping mechanism (2-5) and is used to drive the tool head clamping mechanism (2-5) to move axially; the high-speed hydraulic torque wrench (2-2) is drivingly connected to the transmission gear B (1-9), the transmission gear B (1-9) is connected to the tool head clamping mechanism (2-5), the tool head clamping mechanism (2-5) and the tool head (2-6) are detachably connected, and the high-speed hydraulic torque wrench (2-2) drives the transmission gear B (1-9) to drive the tool head clamping mechanism (2-5) to rotate together with the tool head (2-6).

7. The execution end for replacing reactor shroud bolts according to claim 6, characterized in that: The tool head clamping mechanism (2-5) comprises: a cylinder B (2-3) and a base B (2-4). The cylinder B (2-3) is arranged at one end of the base B (2-4). The cylinder B (2-3) is connected to the tool head chuck. The tool head chuck is pulled by the cylinder B (2-3) to realize the clamping state or the opening state of the tool head chuck.

8. The execution end for replacing reactor shroud bolts according to claim 6, characterized in that: The tool head (2-6) comprises: a screw hole processing tap (2-6-1), a prototype bolt disassembly tool head (2-6-2), a broken wire removal tool head (2-6-3), a new bolt assembly and disassembly tool head (2-6-4), a thread cleaning tool head (2-6-5), and a new bolt expansion joint anti-loosening tool head (2-6-6).

9. The execution end for replacing reactor shroud bolts according to claim 8, characterized in that: The prototype bolt disassembling tool head (2-6-2) comprises: a core rod (3-1), a spring (3-2), a slide rod (3-3), an outer sleeve (3-4), and an inner sleeve (3-5); the core rod (3-1) is fixedly connected to the outer sleeve (3-4), the inner sleeve (3-5) and the core rod (3-1) are connected in a spline style, the inner sleeve (3-5) can slide in the outer sleeve (3-4), the slide rod (3-3) passes through a long hole of the outer sleeve (3-4) and is connected to the inner sleeve (3-5) to limit its travel range, and a spring (3-2) is provided between the raised end surface of the core rod (3-1) and the slide rod (3-3).

Images