A reactor vessel bolt thread repair tool

Abstract

The utility model discloses a kind of repair cutters of reactor pressure vessel screw hole thread, comprising: with the base plate component of positioning installation of to-be-repaired screw hole, is equipped with middle positioning hole;It is equipped with the measuring ring of circumferential scale, with base plate component fixed connection, and with middle positioning hole centring arrangement;Tool-path component, insert middle positioning hole, and with measuring ring screw joint to adjust the height position and circumferential position of tool-path component relative to to-be-repaired screw hole;Cutting component, with tool-path component connection and follow tool-path component movement to mill the defect position of to-be-repaired screw hole.By rotating tool-path component relative to measuring ring rotation and lifting to adjust the advance of cutting component, while cutting component is cleaned to damaged screw hole thread, base plate component realizes overall positioning, measuring ring facilitates operator to control the feed speed of tool-path component, ensure the controllability of repair process.The repair efficiency of the utility model is high and effect is good, can reduce personnel exposure time, reduce personnel irradiation injury.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant reactor pressure vessel thread hole repair technology, and in particular to a tool for repairing reactor pressure vessel thread holes. Background Technology

[0002] During nuclear power plant maintenance, collisions occasionally occur during the disassembly of reactor pressure vessel studs, causing varying degrees of damage to the threads. Currently, manual repair is the primary method for addressing thread damage. However, manual repair is ineffective, time-consuming, and carries the risk of radiation exposure to personnel, potentially causing harm. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a tool for repairing the threads of a reactor pressure vessel screw hole.

[0004] The technical solution adopted by this utility model to solve its technical problem is: to construct a thread repair tool for a reactor pressure vessel screw hole, comprising:

[0005] The base plate assembly, which is positioned and mounted with the screw hole to be repaired, has a central positioning hole;

[0006] A measuring ring with circumferential graduations is fixedly connected to the substrate assembly and is aligned with the central positioning hole;

[0007] The tool feed assembly is inserted into the central positioning hole and screwed to the measuring ring to adjust the height and circumferential position of the tool feed assembly relative to the screw hole to be repaired.

[0008] A cutting assembly is connected to and follows the movement of the feed assembly to mill the defect location of the screw hole to be repaired.

[0009] In some embodiments, the feed assembly includes a hollow stud tube, an upper end cap, a lower end cap, and at least one operating handle. The stud tube is screwed to the measuring ring. The upper end cap is fixedly connected to the top of the stud tube and connected to the upper part of the cutting assembly. The lower end cap is fixedly connected to the lower part of the stud tube and connected to the lower part of the cutting assembly, and the lower end cap has an extension window for part of the cutting assembly to extend out. The operating handle is fixedly connected to the upper end cap to rotate the stud tube to drive the cutting assembly to rotate and move up and down.

[0010] In some embodiments, the cutting assembly is a milling cutter assembly, including a mounting base, a drive unit, a mounting shaft, and a cutter head. The mounting base is connected to the feed assembly to follow the movement of the feed assembly to adjust the height and circumferential position of the cutter head relative to the screw hole to be repaired. The drive unit is fixedly connected to the mounting base, and the drive shaft of the drive unit, the mounting shaft, and the cutter head are sequentially connected to drive the cutter head to rotate and cut.

[0011] In some embodiments, the mounting base includes a mounting cylinder, an upper connector, an adjusting member, and an eccentric seat. The mounting cylinder is rotatably connected to the feed assembly. The upper connector is fixedly connected to the mounting cylinder and the adjusting member respectively. The eccentric seat is fixedly connected to the lower part of the mounting cylinder and the driving member, and the eccentric seat is provided with a first clearance hole for the drive shaft of the driving member to pass through.

[0012] The mounting base also includes several bearings and bearing covers. The bearings are disposed in the clearance holes of the eccentric seat and connected to the mounting shaft to form a rotating pair. The bearing covers are connected to the bottom of the eccentric seat to limit the bearings, and the bearing covers are provided with a second clearance hole for the mounting shaft to extend out.

[0013] In some embodiments, the cutting assembly further includes a graduated ring disposed on the outer periphery of the upper connector to measure the distance between the cutter head and the hole wall of the screw hole to be repaired.

[0014] In some embodiments, the cutting assembly is a comb-cutting assembly, including a lead screw adjusting assembly, a positioning assembly, a centering guide sleeve, and a plurality of cutting blades. The lead screw adjusting assembly axially passes through the feed assembly and is connected to the upper part of the feed assembly to follow the movement of the feed assembly to adjust the height and circumferential position of the cutting blades relative to the screw hole to be repaired and to perform milling. The centering guide sleeve is connected to the lower part of the feed assembly and is sleeved on the outer periphery of the positioning assembly. The plurality of cutting blades are slidably inserted into the centering guide sleeve. The positioning assembly is fixedly connected to the lower part of the lead screw adjusting assembly to follow the rise and fall of the lead screw adjusting assembly. The positioning assembly is configured with a gradually changing outer diameter and always abuts against the plurality of cutting blades to adjust the radial position of the cutting blades along the centering guide sleeve.

[0015] In some embodiments, the adjustment assembly includes a cone and a cone sleeve. The cone is fixedly connected to the lower end of the lead screw adjustment assembly and abuts against the inner wall of the blade. The cone sleeve is fitted onto the cone and inserted into and limited by the blade.

[0016] In some embodiments, the substrate assembly includes a substrate adapted to the screw hole to be repaired, at least one positioning component connected to an adjacent hole of the screw hole to be repaired, a positioning ring cylinder for screwing the feed assembly, and at least one handle. The positioning component is fixedly connected to the substrate and disposed on the side of the substrate, the positioning ring cylinder is fixedly connected to the substrate and disposed on the upper part of the substrate, and the handle is fixedly connected to the substrate or the positioning component.

[0017] The base plate and the positioning ring cylinder are both provided with the central positioning hole.

[0018] In some embodiments, a tool calibration component for calibrating the cutting component is further included, which is isolated from the substrate assembly;

[0019] The tool calibration assembly includes a support, a tool calibration ruler, and a reference component that are stably placed externally. The tool calibration ruler is fixedly connected to the upper part of the support, and a gap is left between the tool calibration ruler and the bottom of the support. The reference component is connected to the tool calibration ruler for reference positioning.

[0020] The measuring ring is detachably connected to the tool calibration ruler; the tool feed assembly is adjusted to adjust the relative position between the tool feed assembly and the tool calibration ruler, and / or the cutting assembly is adjusted to adjust the relative position between the cutting assembly and the tool feed assembly.

[0021] In some embodiments, a detection element is also included, which is connected to the feed assembly or the cutting assembly and is positioned toward the threaded hole wall to check the working effect of the cutting assembly.

[0022] By implementing this utility model, the following beneficial effects can be achieved:

[0023] This invention relates to a reactor pressure vessel thread repair tool. The cutting assembly's forward movement is adjusted by the rotation and elevation of the feed assembly relative to the measuring ring. Simultaneously, the cutting assembly cleans the damaged threads, while the base plate assembly achieves overall positioning. The measuring ring allows the operator to control the feed speed of the feed assembly, ensuring the controllability of the repair process. This invention offers high repair efficiency and excellent results, reducing personnel exposure time and minimizing radiation damage. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of a reactor pressure vessel thread repair tool according to an embodiment of the present invention;

[0026] Figure 2 yes Figure 1 A cross-sectional view of a tool for repairing the threaded holes of a reactor pressure vessel.

[0027] Figure 3 yes Figure 1 A schematic diagram of the installation of the thread repair tool for the bolt holes of the reactor pressure vessel;

[0028] Figure 4 yes Figure 1 A schematic diagram of the substrate assembly in the diagram;

[0029] Figure 5 yes Figure 1 A schematic diagram of the tool feed assembly in the diagram;

[0030] Figure 6 yes Figure 1 The diagram shows the structure of the cutting assembly, which is a milling cutter assembly.

[0031] Figure 7 This is a schematic diagram of the structure of a cutting assembly according to another embodiment of the present invention, wherein the cutting assembly is a comb assembly;

[0032] Figure 8 This is a schematic diagram of the structure of a blade calibration assembly according to an embodiment of the present invention;

[0033] Figure 9 yes Figure 8 One of the schematic diagrams for the use of the tool calibration assembly, in which the cutting assembly is a milling cutter assembly;

[0034] Figure 10 yes Figure 8 The second schematic diagram of the use of the blade calibration component shows that the cutting component is the comb blade component;

[0035] The components include: 1. Base plate assembly; 11. Base plate; 12. Positioning assembly; 121. Clamping component; 122. Initial positioning component; 123. Connecting plate; 124. Expansion nut; 125. Clamping nut; 126. Positioning handle; 13. Positioning ring cylinder; 14. Handle; 15. Central positioning hole; 2. Measuring ring; 3. Feeding assembly; 31. Stud tube; 32. Upper end cap; 33. Lower end cap; 34. Operating handle; 35. Waste collection component; 36. Clearance window; 4. Cutting assembly; 4-1. Milling cutter assembly; 41-1. Mounting base; 411-1. Mounting cylinder; 412-1. Upper connecting component; 413-1. Adjusting component; 414-1. 415-1 Eccentric seat; 416-1 Bearing; 42-1 Drive component; 43-1 Mounting shaft; 44-1 Cutter disc; 42-2 Comb assembly; 41-2 Lead screw adjustment assembly; 411-2 Connecting rod; 412-2 First adjusting nut; 413-2 Second adjusting nut; 42-2 Positioning assembly; 421-2 Cone; 422-2 Cone sleeve; 43-2 Centering guide sleeve; 44-2 Blade; 5. Calibrating assembly; 51. Bracket; 52. Calibrating ruler; 521. Calibrating seat; 522. Calibrating block; 523. Annular groove; 53. Reference component; 100. Screw hole to be repaired; 200. Adjacent hole. Detailed Implementation

[0036] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a chemical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between 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.

[0040] See Figures 1 to 10 , emphasizing Figures 1 to 3 As shown, one embodiment of this utility model discloses a reactor pressure vessel thread repair tool, used to repair the threads of damaged threaded holes in the pressure vessel within a nuclear power plant reactor. With reasonable modification, it can also be used to repair damaged threaded holes in other devices. The reactor pressure vessel thread repair tool includes a base plate assembly 1, a measuring ring 2, a feed assembly 3, and a cutting assembly 4. The base plate assembly 1 is positioned and installed with the threaded hole 100 to be repaired and has a central positioning hole 15. The measuring ring 2 has circumferential graduations, is fixedly connected to the base plate assembly 1, and is centered with the central positioning hole 15. The feed assembly 3 is inserted into the central positioning hole 15 and screwed to the measuring ring 2 to adjust the height and circumferential position of the feed assembly 3 relative to the threaded hole 100 to be repaired. The cutting assembly 4 is connected to the feed assembly 3 and moves with the feed assembly 3 to mill the defective position of the threaded hole 100 to be repaired. The measuring ring 2 and the base plate assembly 1 are detachably connected, for example, by fasteners or by snap-fit. The substrate assembly 1 and the screw hole 100 to be repaired, as well as the cutting assembly 4 and the tool feed assembly 3, are also detachably connected, as detailed below.

[0041] This utility model relates to a reactor pressure vessel thread repair tool. The feed assembly 3 adjusts the advance of the cutting assembly 4, which simultaneously cleans the damaged threads. For example, the cutting assembly 4 can be adjusted to advance from top to bottom or from bottom to top. The repair process can be standardized by adjusting the feed assembly and the measuring ring 2. The base plate assembly 1 provides overall positioning, with the central positioning hole 15 corresponding to the threaded hole 100 to be repaired, facilitating the insertion of the feed assembly 3 into the hole. The measuring ring 2 allows the operator to control the feed speed of the feed assembly 3, ensuring the controllability of the repair process, and also allows staff to observe the position of the cutting assembly 4.

[0042] Compared with existing manual repair methods, this invention offers better repair results, shorter repair time, and higher repair efficiency, while also reducing personnel exposure time and minimizing radiation damage.

[0043] like Figures 2 to 4As shown, in some embodiments, the substrate assembly 1 includes a substrate 11 adapted to the screw hole 100 to be repaired, at least one positioning component 12 connected to an adjacent hole 200 of the screw hole 100 to be repaired, a positioning ring cylinder 13 for screwing onto the feed assembly 3, and at least one handle 14. The positioning component 12 is fixedly connected to the substrate 11 and disposed on the side of the substrate 11, the positioning ring cylinder 13 is fixedly connected to the substrate 11 and disposed on the upper part of the substrate 11, and the handle 14 is fixedly connected to the substrate 11 or the positioning component 12. The substrate 11 and the positioning ring cylinder 13 are provided with a central positioning hole 15. The central positioning hole 15 corresponds to the position of the screw hole 100 to be repaired, and the substrate 11 abuts against the edge of the screw hole 100 to be repaired. The positioning component 12 is used to achieve overall positioning together with the substrate 11 and to assist in fixing the substrate 11. The positioning ring cylinder 13 is used to fix the measuring ring 2 and to limit the movement of the feed assembly 3. The handle 14 is used for convenient micro-movement or short-distance transfer of the entire substrate assembly 1. Figure 3 The screw hole 100 to be repaired and the adjacent hole 200 are only schematic diagrams to simulate the screw hole structure.

[0044] Specifically, the positioning component 12 can be one or two. If there is one positioning component 12, it can be connected to any adjacent hole 200 of the screw hole 100 to be repaired. When there are two positioning components 12, they can be connected to the adjacent holes 200 on both sides of the screw hole 100 to be repaired simultaneously to enhance the positioning force and prevent the substrate 11 from shifting. Understandably, in some embodiments, in order to achieve the overall positioning and fixing of the substrate assembly 1, a single positioning component 12 may include a clamping member 121 that abuts against the side wall of the adjacent hole 200 of the screw hole 100 to be repaired, a primary positioning member 122, a connecting plate 123 fixedly connected to the substrate 11, a tightening nut 124, a clamping nut 125, and a positioning handle 126. The primary positioning member 122 is sleeved on the upper part of the clamping member 121, the connecting plate 123 is sleeved on the upper part of the primary positioning member 122, and the tightening nut 124 is screwed to the primary positioning member 122 and together with the primary positioning member 122 clamps and fixes the connecting plate 123. The clamping nut 125 is screwed to the upper part of the clamping member 121 and abuts against the top of the initial positioning member 122. The positioning handle 126 is screwed to the upper part of the clamping member 121 to provide a point of force. A gap is left between the top of the initial positioning member 122 and the top of the tightening nut 124 to avoid the clamping nut 125. The connecting plate 123 and the base plate 11 can be an integrally formed structure or the two can be welded together.

[0045] Furthermore, the clamping member 121 may include an integrally formed clamping plate and a clamping stud, the clamping stud having external threads for the clamping nut 125 to be screwed in and internal threads for the positioning handle 126 to be screwed in. The initial positioning member 122 includes an integrally formed initial positioning plate and an initial positioning stud, the initial positioning stud having external threads for the tightening nut 124 to be screwed in and a through hole for the clamping stud to pass through. The design of the initial positioning member 122 and the clamping member 121 ensures the stability of the substrate assembly 1 during installation, preventing loosening and displacement.

[0046] like Figure 5 As shown, in some embodiments, the feed assembly 3 includes a hollow stud tube 31, an upper end cap 32, a lower end cap 33, and at least one operating handle 34. The stud tube 31 is screwed to the measuring ring 2. The upper end cap 32 is fixedly connected to the top of the stud tube 31 and connected to the upper part of the cutting assembly 4. The lower end cap 33 is fixedly connected to the lower part of the stud tube 31 and connected to the lower part of the cutting assembly 4, and the lower end cap 33 is provided with an extension window for part of the cutting assembly 4 to extend out. The operating handle 34 is fixedly connected to the upper end cap 32 to rotate the stud tube 31, thereby driving the cutting assembly 4 to rotate and rise / fall. The stud tube 31, screwed to the measuring ring 2, is used to position the entire feed assembly 3. The upper end cap 32 and the lower end cap 33 are used to simultaneously fix the cutting assembly 4. The operating handle 34 is used to manually push the entire feed assembly 3 to rotate, causing the stud tube 31 to rotate and rise or fall simultaneously, thereby driving the cutting assembly 4 to rise or fall.

[0047] In some embodiments, the feed assembly 3 further includes a waste collection member 35 for collecting milling waste. The waste collection member 35 is fixedly connected to the lower end cap 33, and the side of the waste collection member 35 is provided with an avoidance window 36 for the cutting assembly 4 to extend out.

[0048] Understandably, such as Figure 6 and Figure 7 As shown, the cutting assembly 4 includes two structural types: a milling cutter assembly 4-1 and a comb cutter assembly 4-2. The appropriate cutting assembly 4 can be selected according to the degree of damage to the threaded hole. It is highly adaptable and suitable for various complex repair scenarios.

[0049] like Figure 2 and Figure 6As shown, in some embodiments, the cutting assembly 4 is a milling cutter assembly 4-1, including a mounting base 41-1, a drive component 42-1, a mounting shaft 43-1, and a cutter head 44-1. The mounting base 41-1 is connected to the feed assembly 3 to follow the movement of the feed assembly 3 to adjust the height and circumferential position of the cutter head 44-1 relative to the screw hole 100 to be repaired. The drive component 42-1 is fixedly connected to the mounting base 41-1, and the drive shaft of the drive component 42-1, the mounting shaft 43-1, and the cutter head 44-1 are sequentially connected to drive the cutter head 44-1 to rotate and cut. The mounting base 41-1 provides a mounting foundation, and the mounting base 41-1, the drive component 42-1, the mounting shaft 43-1, and the cutter head 44-1 are sequentially connected and fixed to achieve transmission. By rotating the stud tube 31 using the handle 34, the stud tube 31 rotates and rises relative to the base plate 11, thereby driving the mounting base 41-1 to rotate and rise simultaneously. The mounting base 41-1, in turn, drives the drive component 42-1, the mounting shaft 43-1, and the cutter head 44-1 to rotate and rise simultaneously. Simultaneously, the operation of the drive component 42-1 drives the mounting shaft 43-1 to rotate, which in turn drives the cutter head 44-1 to rotate for cutting, thus cleaning damaged and irreparable threads. The cleaned waste is collected by the waste collection component 35. The drive component 42-1 is a pneumatic motor. It is understood that in some other embodiments, the clearance window 36 may also be provided directly below the cutter head 44-1 to facilitate the assembly and disassembly of the cutter head 44-1.

[0050] like Figure 6 As shown, in some embodiments, the mounting base 41-1 includes a mounting cylinder 411-1, an upper connecting member 412-1, an adjusting member 413-1, and an eccentric seat 414-1. The mounting cylinder 411-1 is rotatably connected to the feed assembly 3. The upper connecting member 412-1 is fixedly connected to the mounting cylinder 411-1 and the adjusting member 413-1 respectively. The eccentric seat 414-1 is fixedly connected to the lower part of the mounting cylinder 411-1 and the driving member 42-1, and the eccentric seat 414-1 is provided with a first clearance hole for the drive shaft of the driving member 42-1 to pass through. Figure 2As shown, the mounting base 41-1 also includes several bearings 415-1 and bearing 415-1 covers. The bearings 415-1 are disposed in the clearance holes of the eccentric seat 414-1 and connected to the mounting shaft 43-1 to form a rotating pair. The bearing 415-1 cover is connected to the bottom of the eccentric seat 414-1 to limit the bearings 415-1, and the bearing 415-1 cover has a second clearance hole for the mounting shaft 43-1 to extend out. The upper connecting member 412-1 covers the upper part of the mounting cylinder 411-1 to prevent foreign objects from entering, and may also have an air pipe hole for the air pipe of the drive member 42-1 to pass through. The adjusting member 413-1 is used to rotate the mounting cylinder 411-1, causing the mounting cylinder 411-1 to rotate and simultaneously rotating the eccentric seat 414-1. The eccentric seat 414-1 can be used to adjust the radial position of the cutter head 44-1, allowing it to retract into the stud tube 31 or extend out of the stud tube 31. For example, when inserting the entire feed assembly 3 and milling assembly into the threaded hole 100 to be repaired before thread repair, and when withdrawing the entire feed assembly 3 and milling assembly from the threaded hole 100 after thread repair, the cutter head 44-1 needs to retract into the stud tube 31. For example, during thread repair, the cutter head 44-1 needs to contact and clean the threads, requiring it to extend outside the stud tube 31. The adjusting member 413-1 is a handheld adjusting member, operated by a worker holding and rotating it. Understandably, in some other embodiments, the adjusting member 413-1 can be configured as an electrically operated adjusting member, rotating automatically.

[0051] In some embodiments, the cutting assembly 4 further includes a graduated ring disposed on the outer periphery of the upper connector 412-1 to measure the distance between the cutter head 44-1 and the hole wall of the screw hole 100 to be repaired. The graduated ring includes at least two graduations: one for when the cutter head 44-1 is retracted into the stud tube 31, and the other for when the cutter head 44-1 extends out of the stud tube 31. The graduated ring is stationary relative to the upper end cap 32 and rotatably mounted relative to the upper connector 412-1. The position of the graduated ring can be indicated by the adjusting member 413-1. Preferably, the graduated ring in this embodiment includes a complete circumferential graduation, which can accurately record the distance between the cutter head 44-1 and the hole wall of the screw hole 100 to be repaired. The graduated ring is not shown in the diagram.

[0052] like Figure 7 and Figure 10As shown, in some embodiments, the cutting assembly 4 is a comb-cutting assembly 4-2, including a lead screw adjusting assembly 41-2, a positioning assembly 42-2, a centering guide sleeve 43-2, and several cutting blades 44-2. The lead screw adjusting assembly 41-2 axially passes through the feed assembly 3 and is connected to the upper part of the feed assembly 3 to follow the movement of the feed assembly 3 to adjust the height and circumferential position of the cutting blades 44-2 relative to the screw hole 100 to be repaired and to perform milling. The centering guide sleeve 43-2 is connected to the lower part of the feed assembly 3 and is sleeved on the outer periphery of the positioning assembly 42-2. Several cutting blades 44-2 are slidably inserted into the centering guide sleeve 43-2. ​​The positioning assembly 42-2 is fixedly connected to the lower part of the lead screw adjusting assembly 41-2 to follow the rise and fall of the lead screw adjusting assembly 41-2. The positioning assembly 42-2 is set with a gradually changing outer diameter and always abuts against several cutting blades 44-2 to adjust the radial position of the cutting blades 44-2 along the centering guide sleeve 43-2. The lead screw adjusting assembly 41-2 axially penetrates the upper end cap 32 of the feed assembly 3 and is fixedly connected to the upper end cap 32 to follow the movement of the stud tube 31. For example, the lead screw adjusting assembly 41-2 includes a connecting rod 411-2, a first adjusting nut 412-2, and a second adjusting nut 413-2. The first adjusting nut 412-2 is rotatably connected to the upper end cap 32 and screwed onto the connecting rod 411-2. The second adjusting nut 413-2 is rotatably connected to the first adjusting nut 412-2 and screwed onto the connecting rod 411-2. The internal thread pitches of the first adjusting nut 412-2 and the second adjusting nut 413-2 are different, and the external thread on the connecting rod 411-2 is correspondingly set, allowing for both fine and coarse adjustments. Rotating the first adjusting nut 412-2 or the second adjusting nut 413-2 allows for axial movement of the connecting rod 411-2, i.e., raising or lowering it. The connecting rod 411-2 is used to provide displacement, realize the movement of the adjustment component 42-2, and thus drive the adjustment component 42-2 to move.

[0053] like Figure 10As shown, in some embodiments, the adjusting assembly 42-2 includes a cone 421-2 and a cone sleeve 422-2. The cone 421-2 is fixedly connected to the lower end of the lead screw adjusting assembly 41-2 and abuts against the inner wall of the blade 44-2. The cone sleeve 422-2 is fitted onto the cone 421-2 and inserted into the blade 44-2 for positioning. The cone 421-2 is connected to the bottom end of the connecting rod 411-2, which can be fixed by screwing, insertion, or welding. The cone 421-2 is used to adjust the radial position of the blade 44-2 and to limit the inward movement of the blade 44-2. The cone sleeve 422-2 is used to limit the outward movement of the blade 44-2. The cone 421-2 and the cone sleeve 422-2 together achieve the positioning of the blade 44-2. The cone sleeve 422-2 can be partially a cylindrical body, and the cone 421-2 can be partially a cylindrical body. The cylindrical body is fitted onto the cylindrical body to reinforce and fix the cone sleeve 422-2. The connection between the connecting rod 411-2 and the cone 421-2 cutting head ensures the precise alignment of the blade 44-2 in the screw hole 100 to be repaired, thus avoiding human error.

[0054] like Figures 8-10 In some embodiments, the reactor pressure vessel thread repair tool further includes a calibration assembly 5 for calibrating the cutting assembly 4, which is isolated from the base plate assembly 1. Precise calibration of the milling assembly can be performed before repair, ensuring the consistency and reliability of the repair process. The calibration assembly 5 includes a support 51 stably placed externally, a calibration ruler 52, and a reference piece 53. The calibration ruler 52 is fixedly connected to the upper part of the support 51, and a gap is left between the calibration ruler 52 and the bottom of the support 51. The reference piece 53 is connected to the calibration ruler 52 for reference positioning. The measuring ring 2 is detachably connected to the calibration ruler 52. The feed assembly 3 is adjusted to adjust the relative position between the feed assembly 3 and the calibration ruler 52, and / or the cutting assembly 4 is adjusted to adjust the relative position between the cutting assembly 4 and the feed assembly 3.

[0055] Specifically, the bracket 51 can be stably placed on the ground and has an internal space for inserting the calibration ruler 52. The calibration ruler 52 may include a calibration seat 521 and a calibration block 522. The calibration seat 521 is a cylindrical structure that is inserted and installed on the bracket 51. Its inner diameter is consistent with the inner diameter of the screw hole 100 to be repaired, and it is used to calibrate the radial position of the cutter head 44-1 of the milling cutter assembly 4-1 or the cutting blade 44-2 of the comb cutter assembly 4-2. The top of the calibration seat 521 is used to install the measuring ring 2. Figure 9 As shown, cutting assembly 4 is milling cutter assembly 4-1, and a calibration method including milling cutter assembly 4-1 is illustrated. The calibration block 522 is used for positioning the cutter head 44-1 of milling cutter assembly 4-1. (As shown...) Figure 10As shown, the cutting assembly 4 is a comb assembly 4-2, and a calibration method including the comb assembly 4-2 is illustrated. The inner wall of the calibration holder 521 may also be provided with at least one annular groove 523, which is aligned with the bottom height of the threaded hole to be repaired, for positioning the height of the blade 44-2 of the comb assembly 4-2. A reference member 53 is fixed to the side wall of the calibration holder 521, and a calibration block 522 is located at the bottom of the calibration holder 521. The reference member 53 and the calibration block 522 are spaced apart, for example, opposite each other, to determine their positions.

[0056] In some embodiments, a detection element is also included. This detection element is connected to the feed assembly 3 or the cutting assembly 4 and positioned towards the threaded hole wall to check the working effect of the cutting assembly 4. The detection element can be an endoscope, which assists in observation to ensure that the insert 44-2 or the cutter head 44-1 is aligned with the thread to be milled, improving the accuracy and safety of the repair. The detection element is not shown in the figure.

[0057] By implementing this utility model, the following beneficial effects can be achieved:

[0058] The forward movement of the cutting assembly 4 is adjusted by rotating and raising / lowering the rotary feed assembly 3 relative to the measuring ring 2. Simultaneously, the cutting assembly 4 cleans the damaged threads of the screw holes. The base plate assembly 1 achieves overall positioning, and the measuring ring 2 allows the operator to control the feed speed of the feed assembly 3, ensuring the controllability of the repair process. This invention offers high repair efficiency and good results, reducing personnel exposure time and minimizing radiation damage.

[0059] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, without departing from the concept of the present utility model, the above embodiments or technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of the present utility model, that is, the embodiments described "in some embodiments" can be freely combined with any of the embodiments above and below. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A reactor vessel bolt thread repair tool characterized by, include: The base plate assembly (1) is positioned and installed with the screw hole (100) to be repaired, and has a central positioning hole (15); A measuring ring (2) with circumferential scale is fixedly connected to the substrate assembly (1) and is centered with the central positioning hole (15); The tool feed assembly (3) is inserted into the central positioning hole (15) and screwed to the measuring ring (2) to adjust the height and circumferential position of the tool feed assembly (3) relative to the screw hole (100) to be repaired; The cutting assembly (4) is connected to the feed assembly (3) and moves with the feed assembly (3) to mill the defect location of the screw hole (100) to be repaired.

2. The reactor pressure vessel thread repair tool according to claim 1, characterized in that, The feed assembly (3) includes a hollow stud tube (31), an upper end cap (32), a lower end cap (33), and at least one operating handle (34). The stud tube (31) is screwed to the measuring ring (2). The upper end cap (32) is fixedly connected to the top end of the stud tube (31) and connected to the upper part of the cutting assembly (4). The lower end cap (33) is fixedly connected to the lower part of the stud tube (31) and connected to the lower part of the cutting assembly (4). The lower end cap (33) is provided with an extension window for part of the cutting assembly (4) to extend out. The operating handle (34) is fixedly connected to the upper end cap (32) to rotate the stud tube (31) to drive the cutting assembly (4) to rotate and rise.

3. The reactor vessel bolt thread repair tool of Claim 1, wherein, The cutting assembly (4) is a milling cutter assembly (4-1), including a mounting base (41-1), a drive component (42-1), a mounting shaft (43-1), and a cutter head (44-1). The mounting base (41-1) is connected to the feed assembly (3) to follow the movement of the feed assembly (3) to adjust the height and circumferential position of the cutter head (44-1) relative to the screw hole (100) to be repaired. The drive component (42-1) is fixedly connected to the mounting base (41-1), and the drive shaft of the drive component (42-1), the mounting shaft (43-1), and the cutter head (44-1) are connected in sequence to drive the cutter head (44-1) to rotate and cut.

4. The reactor vessel bolt thread repair tool of Claim 3, wherein, The mounting base (41-1) includes a mounting cylinder (411-1), an upper connector (412-1), an adjusting member (413-1), and an eccentric seat (414-1). The mounting cylinder (411-1) is rotatably connected to the feed assembly (3). The upper connector (412-1) is fixedly connected to the mounting cylinder (411-1) and the adjusting member (413-1) respectively. The eccentric seat (414-1) is fixedly connected to the lower part of the mounting cylinder (411-1) and the driving member (42-1). The eccentric seat (414-1) is provided with a first clearance hole for the drive shaft of the driving member (42-1) to pass through. The mounting base (41-1) further includes a plurality of bearings (415-1) and bearing (415-1) covers. The bearings (415-1) are disposed in the clearance holes of the eccentric seat (414-1) and connected to the mounting shaft (43-1) to form a rotating pair. The bearing (415-1) cover is connected to the bottom of the eccentric seat (414-1) to limit the bearings (415-1), and the bearing (415-1) cover is provided with a second clearance hole for the mounting shaft (43-1) to extend out.

5. The reactor vessel bolt thread repair tool of Claim 4, wherein, The cutting assembly (4) also includes a scale ring disposed on the outer periphery of the upper connector (412-1) to measure the distance between the cutter head (44-1) and the hole wall of the screw hole (100) to be repaired.

6. The reactor vessel bolt thread repair tool of Claim 1, wherein, The cutting assembly (4) is a comb-cutting assembly (4-2), including a lead screw adjustment assembly (41-2), a positioning assembly (42-2), a centering guide sleeve (43-2), and several cutting blades (44-2). The lead screw adjustment assembly (41-2) axially passes through the feed assembly (3) and is connected to the upper part of the feed assembly (3) to follow the movement of the feed assembly (3) to adjust the height and circumferential position of the cutting blades (44-2) relative to the screw hole (100) to be repaired and to perform milling; the centering guide sleeve (43-2) and the feed assembly (44-2) are connected to the feed assembly (3) to adjust the height and circumferential position of the cutting blades (44-2) relative to the screw hole (100) to be repaired. The lower part of the blade assembly (3) is simultaneously sleeved on the outer periphery of the adjusting assembly (42-2), and a plurality of blades (44-2) are slidably inserted into the centering guide sleeve (43-2); the adjusting assembly (42-2) is fixedly connected to the lower part of the lead screw adjusting assembly (41-2) to follow the rise and fall of the lead screw adjusting assembly (41-2), and the adjusting assembly (42-2) is set with a gradually changing outer diameter, always abutting against a plurality of blades (44-2) to adjust the radial position of the blades (44-2) along the centering guide sleeve (43-2).

7. The reactor vessel bolt thread repair tool of Claim 6, wherein, The adjustment assembly (42-2) includes a cone (421-2) and a cone sleeve (422-2). The cone (421-2) is fixedly connected to the lower end of the lead screw adjustment assembly (41-2) and abuts against the inner wall of the blade (44-2). The cone sleeve (422-2) is sleeved on the cone (421-2) and inserted into and limited the blade (44-2).

8. The reactor vessel bolted thread repair tool of any of claims 1-7, wherein, The substrate assembly (1) includes a substrate (11) adapted to the screw hole (100) to be repaired, at least one positioning component (12) connected to an adjacent hole (200) of the screw hole (100) to be repaired, a positioning ring cylinder (13) for screwing the feed assembly (3) and at least one handle (14). The positioning component (12) is fixedly connected to the substrate (11) and disposed on the side of the substrate (11). The positioning ring cylinder (13) is fixedly connected to the substrate (11) and disposed on the upper part of the substrate (11). The handle (14) is fixedly connected to the substrate (11) or the positioning component (12). The base plate (11) and the positioning ring cylinder (13) are both provided with the central positioning hole (15).

9. The reactor vessel bolted thread repair tool of any of claims 1-7, wherein, It also includes a tool calibration assembly (5) for calibrating the cutting assembly (4), which is isolated from the substrate assembly (1); The blade calibration assembly (5) includes a support (51) stably placed on the outside, a blade calibration ruler (52) and a reference component (53). The blade calibration ruler (52) is fixedly connected to the upper part of the support (51), and a gap is left between the blade calibration ruler (52) and the bottom of the support (51). The reference component (53) is connected to the blade calibration ruler (52) for reference positioning. The measuring ring (2) is detachably connected to the tool calibrator (52); the tool feed assembly (3) is adjusted to adjust the relative position between the tool feed assembly (3) and the tool calibrator (52), and / or the cutting assembly (4) is adjusted to adjust the relative position between the cutting assembly (4) and the tool feed assembly (3).

10. The reactor vessel bolted thread repair tool of any of claims 1-7, wherein, It also includes a detection element, which is connected to the feed assembly (3) or the cutting assembly (4) and is positioned toward the screw hole wall to check the working effect of the cutting assembly (4).

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