Nuclear reactor control rod guide tube thread forming apparatus and method

Abstract

The present application relates to nuclear power equipment technical field, especially a kind of forming equipment and forming method.It includes positioning device, processing device and hoisting device, positioning device includes first positioning column and second positioning column, first positioning column and second positioning column are suitable for being connected to the center hole of adjacent two control rod guide cylinder, processing device includes first drive assembly, second drive assembly and tool bit assembly, first drive assembly and second drive assembly are connected with tool bit assembly, first drive assembly is used to drive tool bit assembly rotation, second drive assembly is used to drive tool bit assembly lifting, to make tool bit assembly on the upper surface of control rod guide cylinder processing thread hole, positioning device and processing device are set to hoisting device, and be hoisted into underwater by hoisting device.Forming method includes the underwater remote processing thread hole of applying above forming equipment.Using this forming equipment, it is convenient to process thread hole on the upper surface of control rod guide cylinder underwater.

Description

Technical Field

[0001] This invention relates to the field of nuclear power equipment technology, and in particular to a device and method for forming screw holes in a nuclear reactor control rod guide tube. Background Technology

[0002] The thermal jacket of a nuclear reactor pressure vessel serves to guide the control rod drive rods and restrict the flow of hot core water into the control rod drive mechanism (CRDM). During operation, flow-induced vibration causes wear on the thermal jacket. This wear extends along the conical concave surface of the CRDM housing and onto the thermal jacket flange until the flange is completely worn. Complete wear of the thermal jacket flange will cause the thermal jacket to detach and protrude onto the upper part of the control rod guide tube (CRGT), forming a foreign object.

[0003] To mitigate wear on the heat jacket flange, a common practice is to install a pad above the control rod guide tube, allowing the bottom guide cover of the heat jacket to rest on the pad. Before installing the pad, threaded holes need to be machined remotely underwater on the upper surface of the control rod guide tube to provide mounting positions for the pad. However, due to the confined underwater working space and the presence of nuclear radiation, it is impossible to manually machine threaded holes on the upper surface of the control rod guide tube underwater. Therefore, a device is needed for remotely machining threaded holes on the surface of the control rod guide tube underwater. Summary of the Invention

[0004] The main objective of this invention is to provide a device and method for forming threaded holes in the guide tube of a nuclear reactor control rod, which aims to solve the technical problem that it is currently inconvenient to process threaded holes on the upper surface of the guide tube of the control rod underwater.

[0005] To achieve the above objectives, this invention proposes a threaded hole forming device for a nuclear reactor control rod guide tube, used for remotely machining threaded holes on the upper surface of the control rod guide tube underwater, comprising:

[0006] The positioning device includes a first positioning post and a second positioning post spaced apart, the first positioning post and the second positioning post being adapted to connect to the center holes of two adjacent control rod guide cylinders;

[0007] A processing device, comprising a first drive assembly, a second drive assembly, and a cutting head assembly, wherein the first drive assembly and the second drive assembly are both connected to the cutting head assembly, the first drive assembly is used to drive the cutting head assembly to rotate, and the second drive assembly is used to drive the cutting head assembly to rise and fall, so that the cutting head assembly processes the threaded hole on the upper surface of the control rod guide cylinder;

[0008] The hoisting device, the positioning device and the processing device are both installed on the hoisting device and are hoisted into the water by the hoisting device.

[0009] In some embodiments, the tool head assembly includes a drilling mechanism, a tapping mechanism, and a transmission mechanism. The transmission mechanism includes a first transmission member and a second transmission member that are connected in a transmission manner. The first transmission member is connected to the drilling mechanism, and the second transmission member is connected to the tapping mechanism.

[0010] The first drive assembly is connected to the first transmission component, and the first drive assembly is used to drive the first transmission component to rotate so that the drilling mechanism and the tapping mechanism rotate synchronously.

[0011] The tapping mechanism is adapted to be connected to a drive rod, which is configured to drive the tapping mechanism to rise and fall so that the bottom end of the tapping mechanism is higher or lower than the bottom end of the drilling mechanism.

[0012] In some embodiments, the tapping mechanism includes:

[0013] A tap assembly, comprising a tap head, a first connecting rod, and a first elastic element, wherein the tap head is connected to one end of the first connecting rod, the end of the first connecting rod away from the tap head is adapted to connect to the drive rod, and the first elastic element is disposed between the tap head and the first connecting rod;

[0014] A guide assembly includes a guide rod and a second connecting rod. The tap assembly is connected to the guide rod, and the second connecting rod is connected to the tap assembly. One end of the second connecting rod away from the tap assembly is adapted to connect to the drive rod, which is used to drive the tap assembly to slide along the guide rod.

[0015] In some embodiments, the processing apparatus further includes a rotary positioning device, which includes a third drive assembly and a turntable. The third drive assembly is connected to the turntable and drives the turntable to rotate. The turntable has a mounting portion and a through-hole processing space. The mounting portion and the processing space are arranged radially along the turntable. The processing apparatus is mounted on the top of the mounting portion. The processing space is used for the drilling mechanism and the tapping mechanism to be inserted or withdrawn.

[0016] In some embodiments, the rotary positioning device further includes a blocking member, which is coaxially arranged with the turntable and connected to the bottom of the turntable. The blocking member is used to block the threaded hole machined on the surface of the control rod guide cylinder, and the blocking member has a clearance hole that extends through the top and bottom.

[0017] The device includes a clearance hole for the drilling mechanism and the tapping mechanism to insert into. The processing device includes a position switching component. The cutter head assembly is connected to the position switching component. The position switching component is used to drive the drilling mechanism and the tapping mechanism to switch positions.

[0018] Alternatively, two clearance holes may be provided, which are respectively used for the drilling mechanism and the tapping mechanism to be inserted. One clearance hole is coaxially arranged with the drilling mechanism, and the other clearance hole is coaxially arranged with the tapping mechanism.

[0019] In some embodiments, the molding equipment further includes a foreign matter collection device, the foreign matter collection device comprising:

[0020] A suction device is mounted on the turntable and positioned on one side of the cutter head assembly along the circumferential rotation of the cutter head assembly. The suction device can rotate with the turntable so that it is aligned with the blind hole formed by the drilling mechanism or the threaded hole formed by the tapping mechanism, and suctions foreign objects generated by the cutter head assembly during the processing of the blind hole or the threaded hole.

[0021] A water blowing device is mounted on the turntable and positioned on one side of the cutter head assembly along its circumferential rotation. The water blowing device includes a connected fourth drive assembly and a water blowing pipe. The water blowing device can rotate with the turntable to align the water blowing pipe with the blind hole formed by the drilling mechanism or the threaded hole formed by the tapping mechanism. The fourth drive assembly is used to drive the water blowing pipe to extend into or retract from the blind hole or the threaded hole.

[0022] In some embodiments, the suction device includes a suction hood and a suction tube, the suction tube and the suction hood being connected, and the end of the water blowing tube being disposed inside the suction hood.

[0023] In some embodiments, the positioning device includes a positioning plate, and the first positioning post and the second positioning post are connected to the positioning plate;

[0024] Wherein, along the radial direction of the first positioning post, a clearance fit is formed between the first positioning post and the positioning plate;

[0025] And / or, along the radial direction of the second positioning post, a clearance fit is formed between the second positioning post and the positioning plate.

[0026] In some embodiments, the positioning device includes a plurality of guide blocks, which are spaced apart around the first positioning post and the second positioning post, and the plurality of guide blocks are configured to be connected to the outer periphery of the control rod guide cylinder;

[0027] The guide block has an inclined sidewall on the side near the first positioning post and the second positioning post. The inclined sidewall extends from the end of the guide block near the positioning plate to the end of the guide block away from the positioning plate. At least a portion of the guide block has a housing on the side away from the inclined sidewall. A second elastic member is provided between the guide block and the housing.

[0028] In some embodiments, the hoisting device includes a plurality of hoisting rods spaced apart, and the hoisting device further includes:

[0029] A horizontal monitoring component is disposed on the hoisting device and is used to detect the levelness of the molding equipment.

[0030] A horizontal adjustment component is provided on the hoisting device, and each of the lifting rods is connected to the horizontal adjustment component. The horizontal adjustment component is used to adjust the length of at least one of the lifting rods to adjust the horizontality of the hoisting of the molding equipment.

[0031] Correspondingly, the present invention also proposes a method for forming threaded holes in a nuclear reactor control rod guide tube. The forming method utilizes the aforementioned nuclear reactor control rod guide tube threaded hole forming equipment to remotely machine threaded holes on the upper surface of the control rod guide tube underwater. The forming method includes:

[0032] The molding equipment is hoisted to the underwater target location using a hoisting device;

[0033] The molding equipment is positioned on the upper surface of the control rod guide cylinder using a positioning device;

[0034] A threaded hole is machined on the upper surface of the control rod guide cylinder using a machining device.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] In the technical solution of this invention, when using this molding equipment to remotely machine threaded holes on the upper surface of the control rod guide cylinder underwater, firstly, the molding equipment is gradually lowered to the target underwater position using a hoisting device. During the underwater hoisting process, underwater television can be used to confirm whether the molding equipment has been hoisted into place. During the underwater hoisting process, the first positioning post is inserted into the center hole of the control rod guide cylinder to be machined, and the second positioning post is inserted into the center hole of the adjacent control rod guide cylinder. The first and second positioning posts are used to achieve underwater positioning and locking of the molding equipment. Preferably, the control rod guide cylinders into which the first and second positioning posts are inserted can be positioned diagonally opposite each other, which increases the arrangement space of the molding equipment and facilitates its underwater positioning. Finally, after confirming that the molding equipment is positioned underwater, the second drive assembly is activated first. This second drive assembly moves the cutter head assembly towards the control rod guide cylinder, causing it to descend to the processing position. Then, the first drive assembly is activated, rotating the cutter head assembly to machine a threaded hole on the upper surface of the control rod guide cylinder. Through this threaded hole, a pad can be installed and secured to the upper surface of the control rod guide cylinder, allowing the guide cover at the bottom of the heat jacket to rest on the pad, thereby reducing wear on the heat jacket flange and extending the service life of the heat jacket.

[0037] This molding equipment allows for remote underwater machining of threaded holes on the upper surface of the control rod guide cylinder, significantly reducing the difficulty of creating such holes and improving accuracy. Furthermore, operators can control the equipment from land for underwater operations, ensuring a safe working environment for the personnel. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the overall structure of a nuclear reactor control rod guide tube screw hole forming device according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the positioning device in a nuclear reactor control rod guide tube screw hole forming equipment according to an embodiment of the present invention;

[0041] Figure 3 for Figure 2A magnified view of a section at point A in the middle;

[0042] Figure 4 This is a schematic diagram of the processing device in the nuclear reactor control rod guide tube screw hole forming equipment provided in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the cutter head assembly in a nuclear reactor control rod guide tube screw hole forming device according to an embodiment of the present invention;

[0044] Figure 6 This is a structural cross-sectional view of the tapping mechanism in a nuclear reactor control rod guide tube screw hole forming device according to an embodiment of the present invention;

[0045] Figure 7 This is a schematic diagram of the rotating positioning device in the screw hole forming equipment for nuclear reactor control rod guide tubes provided in an embodiment of the present invention, viewed from a first perspective.

[0046] Figure 8 This is a schematic diagram of the rotating positioning device in the screw hole forming equipment for nuclear reactor control rod guide tubes provided in an embodiment of the present invention, viewed from a second perspective.

[0047] Figure 9 This is a schematic diagram of the hoisting device in the nuclear reactor control rod guide tube screw hole forming equipment according to an embodiment of the present invention;

[0048] Figure 10 This is a schematic diagram of the sealing component in a nuclear reactor control rod guide tube screw hole forming device according to an embodiment of the present invention;

[0049] Figure 11 This is an assembly diagram of a nuclear reactor control rod guide tube screw hole forming device and a control rod guide tube according to an embodiment of the present invention;

[0050] Figure 12 for Figure 11 A magnified view of a section at point B in the middle.

[0051] Explanation of icon numbers:

[0052] 100. Positioning device;

[0053] 110. First positioning post; 120. Second positioning post; 130. Positioning plate; 140. Guide block;

[0054] 131. Clearance hole; 132. Fixing hole;

[0055] 141. Inclined sidewall; 142. Outer shell; 143. Second elastic element;

[0056] 200. Processing equipment;

[0057] 210. First drive assembly; 220. Second drive assembly; 230. Cutter head assembly; 240. Rotary positioning device;

[0058] 231. Drilling mechanism; 232. Tapping mechanism; 233. Transmission mechanism;

[0059] 2321. Tap assembly; 2322. Guide assembly;

[0060] 23211, Tap head; 23212, First connecting rod; 23213, First elastic element;

[0061] 23221, Guide rod; 23222, Second connecting rod;

[0062] 2331. First transmission component; 2332. Second transmission component;

[0063] 241. Third drive assembly; 242. Turntable; 243. Sealing component;

[0064] 2421. Installation section; 2422. Processing space;

[0065] 2431. Clearance hole;

[0066] 300. Lifting equipment;

[0067] 310. Borehole; 320. Horizontal monitoring assembly; 330. Horizontal adjustment assembly;

[0068] 400. Foreign object collection device;

[0069] 410. Suction device; 420. Water blowing device; 430. Foreign object shield;

[0070] 411. Suction hood; 412. Suction tube;

[0071] 421. Fourth drive assembly; 422. Water blower pipe;

[0072] 500. Lifting position sensor;

[0073] 600. Rotary position sensor;

[0074] 700. Water pipe position sensor;

[0075] 800. Fixed column.

[0076] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0077] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0078] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0079] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0080] The reactor pressure vessel heat jacket serves to guide the control rod drive rods and restrict the flow of hot core water into the control rod drive mechanism (CRDM). During operation, flow-induced vibration causes wear on the heat jacket, which extends along the conical concave surface of the CRDM housing and onto the heat jacket flange until the flange is completely worn. Complete wear of the heat jacket flange will cause the heat jacket to detach and protrude onto the upper part of the control rod guide tube (CRGT), forming a foreign object.

[0081] To mitigate wear on the heat jacket flange, a common practice is to install a pad above the control rod guide tube, allowing the bottom guide cover of the heat jacket to rest on the pad. Before installing the pad, threaded holes need to be machined remotely underwater on the upper surface of the control rod guide tube to provide mounting positions for the pad. However, due to the confined underwater working space and the presence of nuclear radiation, it is impossible to manually drill threaded holes on the upper surface of the control rod guide tube underwater. Therefore, a device is needed for remotely machining threaded holes on the surface of the control rod guide tube underwater.

[0082] Based on this, in order to solve the technical problem that it is currently inconvenient to machine threaded holes on the upper surface of the control rod guide cylinder underwater, referring to Figures 1 to 12 An embodiment of the present invention provides a threaded hole forming device for nuclear reactor control rod guide tubes. This forming device is used for underwater remote machining of threaded holes on the upper surface of the control rod guide tubes. The forming device includes a positioning device 100, a machining device 200, and a hoisting device 300. The positioning device 100 includes a first positioning post 110 and a second positioning post 120 spaced apart, which are adapted to connect to the center holes of two adjacent control rod guide tubes. The processing device 200 includes a first drive assembly 210, a second drive assembly 220, and a cutter head assembly 230. Both the first drive assembly 210 and the second drive assembly 220 are connected to the cutter head assembly 230. The first drive assembly 210 can be a rotary motor for driving the cutter head assembly 230 to rotate. The second drive assembly 220 can be a lifting motor (exemplarily, for example, the lifting motor can work in conjunction with a lead screw structure) for driving the cutter head assembly 230 to lift and lower. The first drive assembly 210 and the second drive assembly 220 synchronously drive the cutter head assembly 230 to feed and rotate vertically, causing the cutter head assembly 230 to process threaded holes on the upper surface of the control rod guide cylinder. Both the positioning device 100 and the processing device 200 are mounted on the lifting device 300 and are lifted underwater by the lifting device 300. For example, the lifting device 300 may include a lifting ring and a lifting rod 310, with the lifting ring located at the top of the lifting rod 310. The number of lifting rings and lifting rods 310, as well as the length of the lifting rods 310, can be adaptively adjusted according to the actual processing conditions. The lifting device 300 is suitable for connecting to lifting equipment. After the lifting equipment is connected to the lifting device 300, the molding equipment can be lifted underwater.

[0083] Specifically, in this embodiment, when using this molding equipment to remotely machine threaded holes on the upper surface of the control rod guide cylinder underwater, firstly, the molding equipment is gradually lowered to the underwater target position using the hoisting device 300. During the underwater hoisting process, underwater television can be used to confirm whether the molding equipment has been hoisted into place. Then, after confirming that the molding equipment has been hoisted into place underwater, the first positioning post 110 is inserted into the center hole of the control rod guide cylinder to be machined, and the second positioning post 120 is inserted into the center hole of the adjacent control rod guide cylinder. The first positioning post 110 and the second positioning post 120 are used to achieve underwater positioning and locking of the molding equipment. Preferably, the control rod guide cylinders to which the first positioning post 110 is inserted and the control rod guide cylinders to which the second positioning post 120 is inserted can be positioned diagonally opposite each other, which increases the arrangement space of the molding equipment and facilitates its underwater positioning. Finally, after confirming that the molding equipment is positioned and fixed underwater, the second drive assembly 220 is activated first. The second drive assembly 220 drives the cutter head assembly 230 to move towards the control rod guide cylinder, causing the cutter head assembly 230 to descend to the processing position. Then, the first drive assembly 210 is activated, driving the cutter head assembly 230 to rotate, while the second drive assembly 220 drives the cutter head assembly 230 to feed vertically. This allows the cutter head assembly 230 to machine blind holes or threaded holes on the upper surface of the control rod guide cylinder. Through the machined threaded holes, a pad can be installed and secured to the upper surface of the control rod guide cylinder, allowing the guide cover at the bottom of the heat jacket to rest on the pad, thereby reducing wear on the heat jacket flange and extending the service life of the heat jacket.

[0084] This molding equipment allows for remote underwater machining of threaded holes on the upper surface of the control rod guide cylinder, significantly reducing the difficulty of creating such holes and improving accuracy. Furthermore, operators can control the equipment from land for underwater operations, ensuring a safe working environment for the personnel.

[0085] It should be noted that before machining the threaded hole, the first drive assembly 210 and the second drive assembly 220 are not working, and the cutter head assembly 230 is in a stopped state and a avoidance state.

[0086] In some embodiments, refer to Figure 1 , Figures 4 to 6The cutting head assembly 230 includes a drilling mechanism 231, a tapping mechanism 232, and a transmission mechanism 233. The transmission mechanism 233 includes a first transmission member 2331 and a second transmission member 2332 connected in a transmission relationship. The first transmission member 2331 is connected to the drilling mechanism 231, and the second transmission member 2332 is connected to the tapping mechanism 232. For example, the first transmission member 2331 and the second transmission member 2332 can be a meshing gear structure, or they can be a cooperating chain structure, or they can be a cooperating conveyor belt structure. A first drive assembly 210 is connected to the first transmission member 2331, and the first drive assembly 210 drives the first transmission member 2331 to rotate, so that the drilling mechanism 231 and the tapping mechanism 232 rotate synchronously. The tapping mechanism 232 is adapted to be connected to a drive rod, which is configured to drive the tapping mechanism 232 to rise and fall, so that the bottom end of the tapping mechanism 232 is higher or lower than the bottom end of the drilling mechanism 231.

[0087] Specifically, in this embodiment, when machining a threaded hole on the upper surface of the control rod guide cylinder, it is necessary to first use the drilling mechanism 231 to complete the drilling, and then use the tapping mechanism 232 to complete the tapping in the hole. Therefore, in the initial machining state, the bottom end of the tapping mechanism 232 is higher than the bottom end of the drilling mechanism 231, so that the tapping mechanism 232 is in an avoidance state.

[0088] When drilling is required, the second drive assembly 220 is activated first. The second drive assembly 220 drives the drilling mechanism 231 and the tapping mechanism 232 to descend together towards the control rod guide tube. When the bottom end of the drilling mechanism 231 reaches the drilling position, the first drive assembly 210 is activated. At the same time, the second drive assembly 220 slows down the descent speed of the drilling mechanism 231 and the tapping mechanism 232, so that the drilling mechanism 231 can descend and drill (at this time, the tapping mechanism 232 is in the avoidance position and the tapping mechanism 232 is in the idling state), ensuring that the drilling depth reaches the target depth.

[0089] Once drilling is complete, i.e., the hole depth reaches the target hole depth, the second drive assembly 220 reverses the direction and drives the drilling mechanism 231 and the tapping mechanism 232 to rise together away from the control rod guide cylinder, causing the drilling mechanism 231 and the tapping mechanism 232 to exit the blind hole. Then, the first drive assembly 210 is turned off, causing the drilling mechanism 231 to stop rotating.

[0090] When tapping is required after drilling, the tapping mechanism 232 is first lowered using the drive rod, ensuring that its bottom is lower than the bottom of the drilling mechanism 231, thus keeping the drilling mechanism 231 in a clearance position. Then, the second drive assembly 220 is activated, driving both the tapping mechanism 232 and the drilling mechanism 231 downwards towards the control rod guide cylinder. Once the bottom of the tapping mechanism 232 reaches the tapping position, the first drive assembly 210 is activated, while the second drive assembly 220 slows down the descent of both the tapping mechanism 232 and the drilling mechanism 231, allowing the tapping mechanism 232 to perform the tapping (at this time, the drilling mechanism 231 is in a clearance position and is idling), ensuring the tapping depth reaches the target depth. It should be noted that during the tapping process, in order to better control the chip effect and prevent the chip from being too long and causing foreign objects to get stuck, the tapping mechanism 232 needs to reciprocate the advance and retraction until it reaches the target tapping position. For example, during the tapping process, the tapping mechanism 232 can retract for 5 seconds (retraction amount of about 0.5 mm) every 30 seconds (advance amount of about 2.5 mm) to ensure the tapping effect.

[0091] Once tapping is complete, i.e., the tapping depth reaches the target tapping depth, the first drive assembly 210 rotates in the reverse direction, causing the tapping mechanism 232 to rotate in the reverse direction. At the same time, the second drive assembly 220 drives the tapping mechanism 232 and the drilling mechanism 231 to rise together in a direction away from the control rod guide cylinder, causing the tapping mechanism 232 and the drilling mechanism 231 to exit the threaded hole. Then, the first drive assembly 210 is turned off, causing the tapping mechanism 232 to stop rotating.

[0092] In some embodiments, the drilling process can be completed in one go, followed by the tapping process, to improve the processing efficiency of the threaded holes. For example, taking the processing of four threaded holes on the upper surface of the control rod guide cylinder as an example, the drilling mechanism 231 can be used to drill four holes on the upper surface of the control rod guide cylinder first, and then the tapping mechanism 232 can be used to tap the four holes in sequence.

[0093] In this embodiment, all the operations required to process the threaded hole can be completed in one go with just one hoisting, avoiding the positioning deviation problem caused by secondary hoisting. This helps to improve the processing accuracy of the threaded hole and reduce the processing difficulty. Moreover, both the drilling mechanism 231 and the tapping mechanism 232 are driven to rotate by the first drive assembly 210 and to lift by the second drive assembly 220, which helps to simplify the overall structure of the forming equipment and reduce the overall weight of the forming equipment.

[0094] It should be noted that the drilling mechanism 231 provided in this embodiment is a specially designed drill bit that integrates drilling and chamfering, used for drilling and chamfering the top edge of the hole.

[0095] In some embodiments, refer to Figure 6 The tapping mechanism 232 includes a tap assembly 2321 and a guide assembly 2322. The tap assembly 2321 includes a tap head 23211, a first connecting rod 23212, and a first elastic member 23213. The tap head 23211 is connected to one end of the first connecting rod 23212. The end of the first connecting rod 23212 away from the tap head 23211 is adapted to connect to a drive rod (for example, the end of the first connecting rod 23212 away from the tap head 23211 may be provided with a screw-on hexagonal head, and the drive rod may be connected to the screw-on hexagonal head). The first elastic member 23213 is disposed between the tap head 23211 and the first connecting rod 23212. The guide assembly 2322 includes a guide rod 23221 and a second connecting rod 23222. The tap assembly 2321 is connected to the guide rod 23221, and the second connecting rod 23222 is connected to the tap assembly 2321. One end of the second connecting rod 23222 away from the tap assembly 2321 is adapted to connect to a drive rod (for example, the end of the second connecting rod 23222 away from the tap head 23211 may be provided with a screw-on hexagonal head, and the drive rod may be connected to the screw-on hexagonal head). The drive rod is used to drive the tap assembly 2321 to slide along the guide rod 23221.

[0096] Specifically, in this embodiment, when tapping is required in the borehole using the tapping mechanism 232, a drive rod can be connected to one end of the second connecting rod 23222. The drive rod drives the tap 23211 to descend along the guide rod 23221 towards the direction of the control rod guide cylinder (for example, a downward thrust can be applied to the drive rod so that the drive rod can drive the tap 23211 to descend along the guide rod 23221 towards the direction of the control rod guide cylinder, or a screwing force can be applied to the drive rod so that the drive rod drives the second connecting rod 23222 to rotate, thereby causing the nut on the second connecting rod 23222 to descend, and then the nut drives the tap 23211 to descend along the guide rod 23221 towards the direction of the control rod guide cylinder), so that the bottom end of the tap 23211 is lower than the bottom end of the drilling mechanism 231. After the tapping mechanism 232 completes tapping all the holes, the driving rod drives the tap 23211 to rise along the guide rod 23221 in a direction away from the control rod guide cylinder, so that the bottom end of the tap 23211 is higher than the bottom end of the drilling mechanism 231, ensuring that the tap 23211 is in a avoidance state.

[0097] During the process of the drive rod driving the tap 23211 to move up and down, the lifting position sensor 500 can be used to sense the height of the tap 23211 moving up and down, which ensures that the tap 23211 can be in a complete avoidance state and that the tap 23211 has sufficient feed stroke.

[0098] Furthermore, if the first drive assembly 210 malfunctions during the tapping operation, a drive rod can be connected to one end of the first connecting rod 23212. The drive rod can then be used to disengage the tap 23211 from the threaded hole, ensuring that the forming equipment can be lifted for maintenance. When the drive rod is connected to the first connecting rod 23212, the first elastic element 23213 acts as a buffer to prevent excessive force from damaging the tap 23211.

[0099] In some embodiments, refer to Figure 1 , Figure 4 , Figure 7 and Figure 8 The processing device 200 also includes a rotary positioning device 240, which includes a third drive assembly 241 and a turntable 242. The third drive assembly 241 is connected to the turntable 242 and drives the turntable 242 to rotate. The turntable 242 has a mounting part 2421 and a vertically penetrating processing space 2422. The mounting part 2421 and the processing space 2422 are arranged radially along the turntable 242. The processing device 200 (e.g., a first drive assembly 210, a second drive assembly 220, and a tool assembly 230) is mounted on the top of the mounting part 2421. The processing space 2422 is used for the drilling mechanism 231 and the tapping mechanism 232 to be inserted or withdrawn.

[0100] Specifically, in this embodiment, the third drive component 241 can drive the turntable 242 to rotate, and the turntable 242 can drive the processing device 200 to rotate, so that the processing device 200 is in different processing positions, and multiple threaded holes are quickly processed along the circumference of the control rod guide cylinder. For example, taking the upper surface of the control rod guide cylinder as an example where threaded holes need to be processed in four positions, drilling is first required in each of the four positions. When drilling in the first position, the third drive component 241 drives the turntable 242 to rotate, and the turntable 242 drives the processing device 200 to rotate to the first position (specifically, aligning the drilling mechanism 231 with the first position). Under the drive of the first drive component 210 and the second drive component 220, the drilling mechanism 231 is inserted into the processing space 2422 and drills at the first position. After drilling is completed at the first position, the drilling mechanism 231 first exits the machining space 2422. Then, the third drive assembly 241 drives the turntable 242 to rotate again, causing the turntable 242 to rotate the machining device 200 from the first position to the second position (specifically, rotating the drilling mechanism 231 from the first position to the second position). Driven by the first drive assembly 210 and the second drive assembly 220, the drilling mechanism 231 inserts into the machining space 2422 and drills a hole at the second position. Following the above steps and in this manner, the turntable 242 drives the drilling mechanism 231 to complete drilling at all four positions.

[0101] After drilling holes at all four positions on the upper surface of the control rod guide cylinder, tapping is required in each of the four holes. When tapping in the first position, the third drive assembly 241 drives the turntable 242 to rotate, causing the turntable 242 to rotate the processing device 200 to the first position (specifically, aligning the tapping mechanism 232 with the first position). Driven by the first drive assembly 210 and the second drive assembly 220, the tapping mechanism 232 inserts into the processing space 2422 and performs tapping in the hole at the first position. After tapping is completed in the first position, the tapping mechanism 232 first exits the processing space 2422. Then, the third drive assembly 241 drives the turntable 242 to rotate again, causing the turntable 242 to rotate the processing device 200 from the first position to the second position (specifically, rotating the tapping mechanism 232 from the first position to the second position). Driven by the first drive assembly 210 and the second drive assembly 220, the tapping mechanism 232 inserts into the processing space 2422 and completes tapping in the hole at the second position. Following the steps described above and so on, the turntable 242 drives the tapping mechanism 232 to complete tapping in the holes at all four positions.

[0102] The turntable 242 may be equipped with a rotational position sensor 600, which is used to sense whether the drilling mechanism 231 or the tapping mechanism 232 has rotated into position.

[0103] In some embodiments, refer to Figure 7 and Figure 8 The third drive assembly 241 may include a turntable motor and a first transmission gear. The first transmission gear is connected to the output shaft of the turntable motor, and the turntable motor can drive the first transmission gear to rotate. The turntable 242 includes a mounting part 2421 and a second transmission gear. The mounting part 2421 is fixed to the top of the second transmission gear. The second transmission gear and the first transmission gear mesh with each other, and the first transmission gear can drive the second transmission gear to rotate. Using the above structure, the structural arrangement of the rotary positioning device 240 can be optimized, and the space of the molding equipment can be utilized more effectively.

[0104] In some embodiments, refer to Figure 7 , Figure 8 and Figure 10 The rotary positioning device 240 also includes a sealing member 243, which is coaxially arranged with the turntable 242 and connected to the bottom of the turntable 242. The sealing member 243 is used to block the threaded hole machined on the surface of the control rod guide cylinder. The sealing member 243 has a through-hole 2431. There is one through-hole 2431, which is used for the drilling mechanism 231 and the tapping mechanism 232 to be inserted. The processing device 200 includes a position switching assembly, and the tool head assembly 230 is connected to the position switching assembly. The position switching assembly is used to drive the drilling mechanism 231 and the tapping mechanism 232 to switch positions.

[0105] Specifically, in this embodiment, when machining multiple threaded holes on the upper surface of the control rod guide cylinder, the drilling mechanism 231 and the tapping mechanism 232 rotate with the turntable 242 to different machining positions, so that the drilling mechanism 231 and the tapping mechanism 232 can sequentially machine threaded holes at different positions. At the same time, the sealing member 243 also rotates with the turntable 242 to different machining positions, so that the clearance hole 2431 of the sealing member 243 is always aligned with the drilling mechanism 231 and the tapping mechanism 232, ensuring that the drilling mechanism 231 and the tapping mechanism 232 can pass through the clearance hole 2431 to machine threaded holes on the upper surface of the control rod guide cylinder, and that the non-clearance hole area of ​​the sealing member 243 blocks other positions on the upper surface of the control rod guide cylinder, preventing foreign objects (such as iron filings) generated during the machining of threaded holes from flowing into the machined threaded holes and causing contamination of the machined threaded holes.

[0106] For example, during drilling, the position switching component first drives the drilling mechanism 231 to switch positions, aligning the drilling mechanism 231 with the clearance hole 2431. Then, the turntable 242 rotates the drilling mechanism 231 and the sealing member 243 together to the first processing position, placing the first processing position, the clearance hole 2431, and the drilling mechanism 231 on the same vertical line. Simultaneously, the non-clearance hole area of ​​the sealing member 243 blocks other positions of the control rod guide cylinder. Driven by the first driving component 210 and the second driving component 220, the drilling mechanism 231 can pass through the clearance hole 2431 to achieve drilling at the first processing position. After drilling is completed at the first processing position, the turntable 242 rotates the drilling mechanism 231 and the sealing member 243 together from the first processing position to the second processing position, so that the second processing position, the clearance hole 2431, and the drilling mechanism 231 are on the same vertical line. At the same time, the non-clearance hole area of ​​the sealing member 243 blocks other positions of the control rod guide cylinder (especially blocking the drilling at the first processing position). Driven by the first drive assembly 210 and the second drive assembly 220, the drilling mechanism 231 can pass through the clearance hole 2431 to drill at the second processing position. Referring to the above steps and so on, the turntable 242 rotates the drilling mechanism 231 and the sealing member 243 to ensure that the drilling mechanism 231 completes drilling at other processing positions. Through the sealing member 243, drilling by the drilling mechanism 231 at different processing positions can be achieved, and foreign matter generated during drilling can be prevented from flowing into the already processed holes.

[0107] During tapping within the drilled hole, the position switching component first drives the tapping mechanism 232 to switch positions, aligning the tapping mechanism 232 with the clearance hole 2431. Then, the turntable 242 rotates the tapping mechanism 232 and the sealing member 243 together to the first machining position, ensuring that the drilled hole, clearance hole 2431, and tapping mechanism 232 at the first machining position are on the same vertical line. Simultaneously, the non-clearance hole area of ​​the sealing member 243 blocks the drilled holes at other machining positions of the control rod guide cylinder. Driven by the first drive component 210 and the second drive component 220, the tapping mechanism 232 can pass through the clearance hole 2431 and tap within the drilled hole at the first machining position. Following the above steps and in this manner, the turntable 242 rotates the tapping mechanism 232 and the sealing member 243, ensuring that the tapping mechanism 232 completes tapping within the drilled holes at other machining positions. By using the sealing component 243, the tapping mechanism 232 can tap holes in different machining positions, and foreign matter generated during tapping can be prevented from flowing into the machined threaded hole.

[0108] After all the threaded holes have been machined, the turntable 242 drives the sealing component 243 to rotate, so that the non-avoidance hole area of ​​the sealing component 243 seals all the threaded holes, ensuring that no foreign objects will enter the threaded holes when the equipment is lifted away.

[0109] Alternatively, in some other embodiments, two clearance holes 2431 are provided, which are respectively used for the drilling mechanism 231 and the tapping mechanism 232 to be inserted. One clearance hole 2431 is coaxially arranged with the drilling mechanism 231, and the other clearance hole 2431 is coaxially arranged with the tapping mechanism 232.

[0110] Specifically, in this embodiment, during drilling, the turntable 242 rotates the drilling mechanism 231 and the sealing member 243 together to the processing position, so that the processing position, one of the clearance holes 2431, and the drilling mechanism 231 are on the same vertical line, ensuring that the drilling mechanism 231 can pass through one of the clearance holes 2431 to drill a hole at the processing position. During tapping inside the hole, the turntable 242 rotates the tapping mechanism 232 and the sealing member 243 together to the processing position, so that the processing position, the other clearance hole 2431, and the tapping mechanism 232 are on the same vertical line, ensuring that the tapping mechanism 232 can pass through the other clearance hole 2431 to tap inside the hole at the processing position.

[0111] It should be noted that the two clearance holes 2431 are close to each other, while the multiple threaded holes are far apart, so the non-clearance hole area of ​​the sealing component 243 does not affect the sealing of other positions of the control rod guide tube.

[0112] In some embodiments, refer to Figure 7 and Figure 8The molding equipment also includes a foreign matter collection device 400, which includes a suction device 410 and a water blowing device 420. The suction device 410 is mounted on the turntable 242 and is located on one side of the cutter head assembly 230 along the circumferential rotation of the cutter head assembly 230. The suction device 410 can rotate with the turntable 242 so that the suction device 410 is aligned with the blind hole formed by the drilling mechanism 231 or the threaded hole formed by the tapping mechanism 232, and suctions the foreign matter generated by the cutter head assembly 230 when processing the blind hole or the threaded hole. The water blowing device 420 is mounted on the turntable 242 and is located on one side of the cutter head assembly 230 along the rotational circumference of the cutter head assembly 230. The water blowing device 420 includes a connected fourth drive assembly 421 and a water blowing pipe 422. The water blowing device 420 can rotate with the turntable 242 so that the water blowing pipe 422 is aligned with the blind hole formed by the drilling mechanism 231 or the threaded hole formed by the tapping mechanism 232. The fourth drive assembly 421 is used to drive the water blowing pipe 422 to extend into or out of the blind hole or the threaded hole.

[0113] Specifically, in this embodiment, the suction device 410 is always operational during drilling and tapping to ensure that foreign matter generated during drilling and tapping can be continuously suctioned by the suction device 410, preventing foreign matter from remaining underwater and causing reactor contamination. After each hole is drilled and after each tapping operation is completed within the drilled hole, the water blowing pipe 422 in the water blowing device 420 needs to be inserted into the drilled hole and threaded hole to blow and agitate the inside of the drilled hole and threaded hole, ensuring that no foreign matter remains inside the drilled hole and threaded hole and guaranteeing the cleanliness of the inside of the drilled hole and threaded hole.

[0114] During drilling or tapping, the suction device 410 continuously suctions foreign objects generated during the drilling mechanism 231 or tapping mechanism 232 from one side. After drilling or tapping is completed, the turntable 242 rotates the suction device 410 so that it faces the blind hole or threaded hole, ensuring that the suction device 410 can directly suck up foreign objects in the blind hole or threaded hole. After the suction device 410 has been in place for a preset time, the turntable 242 rotates the water blowing device 420 so that it faces the blind hole or threaded hole, and the fourth drive component 421 drives the water blowing pipe 422 to extend into the blind hole or threaded hole to blow and stir, causing the foreign objects in the blind hole or threaded hole to be blown out and sucked up by the suction device 410.

[0115] The water blowing device 420 may also include a water blowing pipe position sensor 700, which is used to sense whether the water blowing pipe 422 has been raised or lowered into position to prevent the water blowing pipe 422 from obstructing the rotation stroke.

[0116] In some embodiments, refer to Figure 1 and Figure 2The foreign object collection device 400 also includes a foreign object shield 430, which is disposed on the outer periphery of the forming equipment. The shield effectively prevents foreign objects generated during drilling or tapping from flowing to the outside of the forming equipment, thus blocking and collecting them. The foreign object shield 430 has a certain height difference from the adjacent control rod guide cylinder, allowing the forming equipment to avoid the pads on the upper surface of the control rod guide cylinders adjacent to those to be drilled, chamfered, or tapped, achieving full coverage of all control rod guide cylinders requiring drilling, chamfering, or tapping.

[0117] In some embodiments, refer to Figure 7 and Figure 8 The suction device 410 includes a suction hood 411 and a suction pipe 412, which are connected to the suction hood 411. The end of the water blowing pipe 422 is located inside the suction hood 411.

[0118] Specifically, in this embodiment, when the suction device 410 suctions foreign objects generated during the processing of blind holes or threaded holes, or when the water blowing pipe 422 in the water blowing device 420 blows and stirs foreign objects in blind holes or threaded holes, the generated foreign objects can be collected in the suction hood 411, thereby facilitating the suction pipe 412 to centrally suction the foreign objects and prevent the foreign objects from floating underwater and causing contamination of the reactor.

[0119] More preferably, the suction cover 411 can be provided with a through hole (the through hole here has a similar function to the clearance hole 2431). The through hole allows the drilling mechanism 231 and the tapping mechanism 232 to pass through, ensuring that foreign objects generated during drilling or tapping can be collected in the suction cover 411 and preventing foreign objects from floating arbitrarily underwater.

[0120] In some embodiments, refer to Figure 2 The positioning device 100 includes a positioning plate 130, with a first positioning post 110 and a second positioning post 120 connected to the positioning plate 130. A clearance fit is formed between the first positioning post 110 and the positioning plate 130 along the radial direction of the first positioning post 110. And / or, a clearance fit is formed between the second positioning post 120 and the positioning plate 130 along the radial direction of the second positioning post 120.

[0121] Specifically, in this embodiment, a floating structure is formed between the first positioning post 110 and the positioning plate 130, or between the second positioning post 120 and the positioning plate 130, meaning that the first positioning post 110 or the second positioning post 120 can undergo slight displacement relative to the positioning plate 130. With this structure, the first positioning post 110 or the second positioning post 120 can accommodate assembly errors between all adjacent control rod guide cylinders on site, ensuring that the first positioning post 110 and the second positioning post 120 can be smoothly inserted into the central hole of the control rod guide cylinder, thus achieving smooth installation and positioning of the molding equipment underwater.

[0122] Reference Figure 2 and Figure 12 Corresponding to the clearance hole 2431 of the sealing component 243, the positioning plate 130 is also provided with clearance hole 131 to ensure that the drilling mechanism 231 and the tapping mechanism 232 can pass smoothly through the positioning plate 130, and to process blind holes or threaded holes on the upper surface of the control rod guide cylinder. Corresponding to the fixing post 800 on the upper surface of the control rod guide cylinder, the positioning plate 130 is provided with fixing hole 132, and the fixing post 800 can pass through the fixing hole 132, thereby realizing the processing of threaded holes on the upper surface of the control rod guide cylinder by this forming equipment.

[0123] In some embodiments, refer to Figure 2 and Figure 3 The positioning device 100 includes a plurality of guide blocks 140, which are spaced apart around the first positioning post 110 and the second positioning post 120. The guide blocks 140 are configured to be connected to the outer periphery of the control rod guide cylinder. An inclined sidewall 141 is provided on the side of the guide block 140 closest to the first positioning post 110 and the second positioning post 120. The inclined sidewall 141 extends from the end of the guide block 140 closest to the positioning plate 130 to the end of the guide block 140 furthest from the positioning plate 130, and is located away from the first positioning post 110 and the second positioning post 120. At least a portion of the guide block 140 has a housing 142 on the side furthest from the inclined sidewall 141. A second elastic member 143 is provided between the guide block 140 and the housing 142.

[0124] Specifically, in this embodiment, the guide block 140 can perform coarse positioning on the outer periphery of the corresponding control rod guide cylinder and guide it in the vertical direction. By providing an inclined sidewall 141 to the guide block 140, it is easy for the guide block 140 to be inserted into the outer periphery of the control rod guide cylinder. At least part of the guide block 140 is of flexible design; that is, the elastic deformation of the second elastic member 143 changes the distance between the guide block 140 and the outer shell 142, allowing the guide block 140 to adapt to assembly errors between adjacent control rod guide cylinders, reducing the difficulty of underwater positioning of the molding equipment.

[0125] In some embodiments, the guide block 140 may be made of acetal steel to prevent the guide block 140 from scratching adjacent components during the coarse positioning and guiding process.

[0126] In some embodiments, refer to Figure 1 and Figure 9The hoisting device 300 includes multiple lifting rods 310 spaced apart. The hoisting device 300 also includes a level monitoring component 320 and a level adjustment component 330. The level monitoring component 320 is disposed in the hoisting device 300 and is used to detect the levelness of the molding equipment. The level adjustment component 330 is disposed in the hoisting device 300, and each lifting rod 310 is connected to the level adjustment component 330. The level adjustment component 330 is used to adjust the length of at least one lifting rod 310 to adjust the levelness of the hoisted molding equipment. For example, the level monitoring component 320 can be an electronic level with a detection accuracy of 0.01 degrees. The level adjustment component 330 can be an adjusting screw.

[0127] Specifically, in this embodiment, when assembling the molding equipment on the ground, if the molding equipment tilts, the leveling component 330 can be used to correct it. For example, when the leveling component 330 is an adjusting screw, the adjusting screw and the lifting rod 310 are threadedly connected. Since the lifting device 300 is provided with multiple lifting rods 310, the lifting device 300 can be provided with multiple adjusting screws corresponding to the multiple lifting rods 310, and a single adjusting screw can adjust a single lifting rod 310. By rotating the adjusting screw, the length of the lifting rod 310 can be changed, thereby achieving the leveling adjustment of the molding equipment. When remotely machining threaded holes underwater, the leveling component 320 can be used to monitor the leveling of the molding equipment in real time.

[0128] In some embodiments, the molding equipment includes a monitoring device and a control system. The monitoring device is used to monitor the machining status of the threaded hole being machined on the upper surface of the control rod guide cylinder by the machining device 200. The control system is connected to the monitoring device and is used to acquire monitoring information from the monitoring device.

[0129] Correspondingly, another embodiment of the present invention also provides a method for forming threaded holes in a nuclear reactor control rod guide tube. This method utilizes the nuclear reactor control rod guide tube threaded hole forming equipment described in any of the above embodiments to remotely machine threaded holes on the upper surface of the control rod guide tube underwater. The forming method includes the following steps:

[0130] Step S100: Use a hoisting device to hoist the molding equipment to the underwater target location;

[0131] Step S200: Position the molding equipment on the upper surface of the control rod guide cylinder using the positioning device;

[0132] Step S300: Use a machining device to machine a threaded hole on the upper surface of the control rod guide cylinder.

[0133] The above forming method is simple and efficient, which helps to reduce the difficulty of underwater remote machining of threaded holes and improve the machining accuracy of underwater remote machining of threaded holes.

[0134] It should be noted that other contents of the nuclear reactor control rod guide tube screw hole forming equipment and method disclosed in this invention can be found in the prior art, and will not be repeated here.

[0135] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural transformations made using the contents of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A threaded hole forming device for a nuclear reactor control rod guide tube, used for underwater remote machining of threaded holes on the upper surface of the control rod guide tube, characterized in that, include: The positioning device includes a first positioning post and a second positioning post spaced apart, the first positioning post and the second positioning post being adapted to connect to the center holes of two adjacent control rod guide cylinders; A processing device, comprising a first drive assembly, a second drive assembly, and a cutting head assembly, wherein the first drive assembly and the second drive assembly are both connected to the cutting head assembly, the first drive assembly is used to drive the cutting head assembly to rotate, and the second drive assembly is used to drive the cutting head assembly to rise and fall, so that the cutting head assembly processes the threaded hole on the upper surface of the control rod guide cylinder; The hoisting device, the positioning device and the processing device are both installed on the hoisting device and are hoisted into the water by the hoisting device; The cutting head assembly includes a drilling mechanism and a tapping mechanism. The processing device further includes a rotary positioning device, which includes a third drive assembly and a turntable. The third drive assembly is connected to the turntable and drives the turntable to rotate. The turntable has a mounting part and a through-hole processing space. The mounting part and the processing space are arranged radially along the turntable. The processing device is mounted on the top of the mounting part. The processing space is used for the drilling mechanism and the tapping mechanism to be inserted or withdrawn. The molding equipment further includes a foreign object collection device, which comprises: A suction device is mounted on the turntable and positioned on one side of the cutter head assembly along the circumferential rotation of the cutter head assembly. The suction device can rotate with the turntable so that it is aligned with the blind hole formed by the drilling mechanism or the threaded hole formed by the tapping mechanism, and suctions foreign objects generated by the cutter head assembly during the processing of the blind hole or the threaded hole. A water blowing device is mounted on the turntable and positioned on one side of the cutter head assembly along its circumferential rotation. The water blowing device includes a connected fourth drive assembly and a water blowing pipe. The water blowing device can rotate with the turntable to align the water blowing pipe with the blind hole formed by the drilling mechanism or the threaded hole formed by the tapping mechanism. The fourth drive assembly is used to drive the water blowing pipe to extend into or retract from the blind hole or the threaded hole.

2. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 1, characterized in that, The cutting head assembly includes a transmission mechanism, which includes a first transmission member and a second transmission member that are connected in a transmission manner. The first transmission member is connected to the drilling mechanism, and the second transmission member is connected to the tapping mechanism. The first drive assembly is connected to the first transmission component, and the first drive assembly is used to drive the first transmission component to rotate so that the drilling mechanism and the tapping mechanism rotate synchronously. The tapping mechanism is adapted to be connected to a drive rod, which is configured to drive the tapping mechanism to rise and fall so that the bottom end of the tapping mechanism is higher or lower than the bottom end of the drilling mechanism.

3. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 2, characterized in that, The tapping mechanism includes: A tap assembly, comprising a tap head, a first connecting rod, and a first elastic element, wherein the tap head is connected to one end of the first connecting rod, the end of the first connecting rod away from the tap head is adapted to connect to the drive rod, and the first elastic element is disposed between the tap head and the first connecting rod; A guide assembly includes a guide rod and a second connecting rod. The tap assembly is connected to the guide rod, and the second connecting rod is connected to the tap assembly. One end of the second connecting rod away from the tap assembly is adapted to connect to the drive rod, which is used to drive the tap assembly to slide along the guide rod.

4. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 1, characterized in that, The rotary positioning device also includes a sealing component, which is coaxially arranged with the turntable and connected to the bottom of the turntable. The sealing component is used to block the threaded hole machined on the surface of the control rod guide cylinder, and the sealing component has a clearance hole that runs through the top and bottom. The device includes a clearance hole for the drilling mechanism and the tapping mechanism to insert into. The processing device includes a position switching component. The cutter head assembly is connected to the position switching component. The position switching component is used to drive the drilling mechanism and the tapping mechanism to switch positions. Alternatively, two clearance holes may be provided, which are respectively used for the drilling mechanism and the tapping mechanism to be inserted. One clearance hole is coaxially arranged with the drilling mechanism, and the other clearance hole is coaxially arranged with the tapping mechanism.

5. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 1, characterized in that, The suction device includes a suction hood and a suction pipe, the suction pipe and the suction hood are connected, and the end of the water blowing pipe is located inside the suction hood.

6. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 1, characterized in that, The positioning device includes a positioning plate, and the first positioning post and the second positioning post are connected to the positioning plate; Wherein, along the radial direction of the first positioning post, a clearance fit is formed between the first positioning post and the positioning plate; And / or, along the radial direction of the second positioning post, a clearance fit is formed between the second positioning post and the positioning plate.

7. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 6, characterized in that, The positioning device includes a plurality of guide blocks, which are arranged at intervals around the first positioning post and the second positioning post, and are configured to be connected to the outer periphery of the control rod guide cylinder; The guide block has an inclined sidewall on the side near the first positioning post and the second positioning post. The inclined sidewall extends from the end of the guide block near the positioning plate to the end of the guide block away from the positioning plate. At least a portion of the guide block has a housing on the side away from the inclined sidewall. A second elastic member is provided between the guide block and the housing.

8. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 1, characterized in that, The hoisting device includes multiple hoisting rods spaced apart, and the hoisting device also includes: A horizontal monitoring component is disposed on the hoisting device and is used to detect the levelness of the molding equipment. A horizontal adjustment component is provided on the hoisting device, and each of the lifting rods is connected to the horizontal adjustment component. The horizontal adjustment component is used to adjust the length of at least one of the lifting rods to adjust the horizontality of the hoisting of the molding equipment.

9. A method for forming screw holes in the guide tube of a nuclear reactor control rod, characterized in that, The nuclear reactor control rod guide tube threaded hole forming equipment according to any one of claims 1 to 8 is used to remotely process threaded holes on the upper surface of the control rod guide tube underwater; the forming method includes: The molding equipment is hoisted to the underwater target location using a hoisting device; The molding equipment is positioned on the upper surface of the control rod guide cylinder using a positioning device; A threaded hole is machined on the upper surface of the control rod guide cylinder using a machining device.

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