Nuclear reactor control rod guide cylinder screw hole forming equipment and method

Abstract

The invention relates to the technical field of nuclear power equipment, in particular to forming equipment and a forming method. The forming equipment comprises a positioning device, a machining device and a hoisting device, the positioning device comprises a first positioning column and a second positioning column which are arranged in a spaced mode, the first positioning column and the second positioning column are suitable for being connected to center holes of two adjacent control rod guide cylinders, and the machining device comprises a first driving assembly, a second driving assembly and a tool bit assembly; the first driving assembly and the second driving assembly are both connected with the tool bit assembly, the first driving assembly is used for driving the tool bit assembly to rotate, and the second driving assembly is used for driving the tool bit assembly to ascend and descend so that the tool bit assembly can machine threaded holes in the upper surface of the control rod guide cylinder. And the water is hoisted into water by the hoisting device. The forming method comprises the step of remotely machining the threaded hole underwater by applying the forming equipment. By means of the forming equipment, threaded holes can be conveniently machined in the upper surface of the control rod guide cylinder underwater.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power equipment, and in particular to a device and a method for forming a screw hole of a guide tube of a control rod of a nuclear reactor. Background Art

[0002] The thermowell of the nuclear reactor pressure vessel provides guidance for the control rod drive rod and limits the flow of high-temperature water in the core into the control rod drive mechanism (CRDM). During operation, the thermowell will wear due to flow-induced vibration. The wear will extend on the concave surface of the inner hole of the CRDM tube seat and the flange surface of the thermowell until the flange is completely worn. If the flange of the thermowell is completely worn, the thermowell will prolapse to the upper part of the control rod guide tube (CRGT) to form a foreign body.

[0003] In order to reduce the wear of the thermal sleeve flange, a method of installing a pad above the control rod guide cylinder is usually adopted so that the guide cover at the bottom of the thermal sleeve can fall on the pad. Before installing the pad above the control rod guide cylinder, it is necessary to remotely process threaded holes on the upper surface of the control rod guide cylinder online underwater to provide installation and fixing holes for the pad. However, due to the small underwater working space and the presence of nuclear radiation, it is impossible to manually process threaded holes on the upper surface of the control rod guide cylinder underwater. Therefore, a device for remotely processing threaded holes on the surface of the control rod guide cylinder underwater is needed. Summary of the invention

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

[0005] To achieve the above-mentioned purpose, the present invention proposes a nuclear reactor control rod guide tube screw hole forming device, which is used for underwater remote processing of threaded holes on the upper surface of the control rod guide tube, comprising:

[0006] A positioning device, the positioning device comprising a first positioning column and a second positioning column arranged at intervals, the first positioning column and the second positioning column being suitable for connecting to the center holes of two adjacent control rod guide cylinders;

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

[0008] A hoisting device, wherein the positioning device and the processing device are both arranged on the hoisting device and are hoisted by the hoisting device into the water.

[0009] In some embodiments, the cutter 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 in transmission connection, the first transmission member is connected to the drilling mechanism, and the second transmission member is connected to the tapping mechanism;

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

[0011] The tapping mechanism is suitable for connecting to a driving rod, and the driving rod 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 comprises:

[0013] A tap assembly, the tap assembly comprising a tap head, a first connecting rod and a first elastic member, the tap head is connected to one end of the first connecting rod, one end of the first connecting rod away from the tap head is suitable for connecting to the driving rod, and the first elastic member is arranged between the tap head and the first connecting rod;

[0014] A guide assembly, the guide assembly includes a guide rod and a second connecting rod, the tap assembly is connected to the guide rod, the second connecting rod is connected to the tap assembly, one end of the second connecting rod away from the tap assembly is suitable for connecting to the drive rod, and the drive rod is used to drive the tap assembly to slide along the guide rod.

[0015] In some embodiments, the processing device also includes a rotational positioning device, which includes a third drive component and a turntable. The third drive component is connected to the turntable and drives the turntable to rotate. The turntable has a mounting portion and a processing space that passes through the upper and lower portions. The mounting portion and the processing space are arranged radially along the turntable. The processing device is installed on the top of the mounting portion, and the processing space is used for the drilling mechanism and the tapping mechanism to insert or withdraw.

[0016] In some embodiments, the rotation positioning device further comprises a blocking member, the blocking member 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 an avoidance hole penetrating from top to bottom;

[0017] Wherein, the avoidance hole is provided with one, the avoidance hole is used for inserting the drilling mechanism and the tapping mechanism, the processing device includes a position switching component, the cutter head component is connected to the position switching component, and the position switching component is used to drive the drilling mechanism and the tapping mechanism to switch positions;

[0018] Alternatively, two avoidance holes are provided, and the two avoidance holes are respectively used for the insertion of the drilling mechanism and the tapping mechanism, wherein one of the avoidance holes is coaxially arranged with the drilling mechanism, and the other avoidance hole is coaxially arranged with the tapping mechanism.

[0019] In some embodiments, the molding device further comprises a foreign matter collecting device, wherein the foreign matter collecting device comprises:

[0020] A suction device, the suction device is mounted on the turntable and disposed on one side of the cutter head assembly along the circumferential direction of rotation of the cutter head assembly, the suction device can rotate with the turntable so that the suction device is aligned with the blind hole formed by the drilling mechanism, or aligned with the threaded hole formed by the tapping mechanism, and sucks foreign matter generated by the cutter head assembly when processing the blind hole or the threaded hole;

[0021] A water blowing device, which is installed on the turntable and is arranged on one side of the cutter head assembly along the rotation circumference of the cutter head assembly. The water blowing device includes a fourth driving assembly and a water blowing pipe connected to each other. The water blowing device can rotate with the turntable so that the water blowing pipe is aligned with the blind hole formed by the drilling mechanism or the threaded hole formed by the tapping mechanism. The fourth driving assembly is used to drive the water blowing pipe to extend into or withdraw from the blind hole or the threaded hole.

[0022] In some embodiments, the suction device includes a suction hood and a suction pipe, the suction pipe is connected to the suction hood, and the end of the water blowing pipe is arranged in the suction hood.

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

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

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

[0026] In some embodiments, the positioning device includes a plurality of guide blocks, the plurality of guide blocks are arranged around the first positioning column and the second positioning column at intervals, and the plurality of guide blocks are configured to be connected to the outer circumference of the control rod guide cylinder;

[0027] Among them, an inclined side wall is provided on the side of the guide block close to the first positioning column and the second positioning column, and the inclined side wall extends from the end of the guide block close to the positioning plate to the end of the guide block away from the positioning plate in a direction away from the first positioning column and the second positioning column, and a shell is provided on at least part of the side of the guide block away from the inclined side wall, and a second elastic member is provided between the guide block and the shell.

[0028] In some embodiments, the lifting device includes a plurality of lifting rods arranged at intervals, and the lifting device further includes:

[0029] A level monitoring component, the level monitoring component is arranged on the hoisting device, and the level monitoring component is used to detect the levelness of the molding equipment;

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

[0031] Correspondingly, the present invention also proposes a method for forming a screw hole of a control rod guide tube of a nuclear reactor, wherein the forming method uses the above-mentioned nuclear reactor control rod guide tube screw hole forming equipment to remotely process a threaded hole on the upper surface of the control rod guide tube underwater; the forming method comprises:

[0032] Using a lifting device to lift the molding equipment to an underwater target location;

[0033] Positioning the molding device 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 by using a machining device.

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

[0036] In the technical solution of the present invention, when the threaded holes are processed on the upper surface of the control rod guide cylinder by remote underwater use of the molding equipment, first, the molding equipment is gradually lowered to the underwater target position by using a hoisting device. During the process of hoisting the molding equipment underwater, it can be confirmed by underwater television whether the molding equipment is hoisted in place. During the underwater hoisting of the molding equipment, the first positioning column is inserted into the center hole of the control rod guide cylinder to be processed, and the second positioning column is inserted into the center hole of the adjacent control rod guide cylinder. The first positioning column and the second positioning column are used to realize the positioning and fixed locking of the molding equipment underwater. Preferably, the control rod guide cylinder plugged by the first positioning column and the control rod guide cylinder plugged by the second positioning column can be in a diagonal position, which can increase the layout space of the molding equipment and facilitate the positioning of the molding equipment underwater. Finally, after confirming that the molding equipment is positioned underwater, the second drive assembly is started first, and the second drive assembly is used to drive the cutter head assembly to move in the direction close to the control rod guide cylinder, so that the cutter head assembly first descends to the processing position, and then the first drive assembly is started, and the first drive assembly is used to drive the cutter head assembly to rotate, so that the cutter head assembly processes the threaded hole on the upper surface of the control rod guide cylinder. Through the threaded hole processed above, the pad can be installed and fastened to the upper surface of the control rod guide cylinder, so that the guide cover at the bottom of the thermal sleeve can fall on the pad, thereby reducing the wear of the thermal sleeve flange and extending the service life of the thermal sleeve.

[0037] By using this forming equipment, threaded holes can be processed on the upper surface of the control rod guide tube remotely underwater, which greatly reduces the difficulty of opening threaded holes on the control rod guide tube and helps to improve the accuracy of processing threaded holes on the control rod guide tube. Moreover, the operator can control this forming equipment on the ground to perform underwater operations, which helps to ensure that the operator is in a safe working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of the overall structure of a screw hole forming device for a nuclear reactor control rod guide tube provided by an embodiment of the present invention;

[0040] Figure 2 A schematic structural diagram of a positioning device in a screw hole forming device for a nuclear reactor control rod guide tube provided by an embodiment of the present invention;

[0041] Figure 3 for Figure 2A partial enlarged view of the middle A;

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

[0043] Figure 5 A schematic structural diagram of a cutter head assembly in a screw hole forming device for a nuclear reactor control rod guide tube provided by an embodiment of the present invention;

[0044] Figure 6 A structural cross-sectional view of a tapping mechanism in a screw hole forming device for a nuclear reactor control rod guide tube provided by an embodiment of the present invention;

[0045] Figure 7 A schematic structural diagram of a rotary positioning device in a screw hole forming device for a nuclear reactor control rod guide cylinder provided by an embodiment of the present invention at a first viewing angle;

[0046] Figure 8 A schematic structural diagram of a rotary positioning device in a screw hole forming device for a nuclear reactor control rod guide cylinder provided by an embodiment of the present invention at a second viewing angle;

[0047] Fig. 9 A schematic diagram of the structure of a hoisting device in a screw hole forming device for a nuclear reactor control rod guide tube provided by an embodiment of the present invention;

[0048] Fig.10 A schematic structural diagram of a plugging member in a screw hole forming device for a nuclear reactor control rod guide tube provided by an embodiment of the present invention;

[0049] Fig.11 A schematic diagram of assembling a screw hole forming device for a control rod guide tube of a nuclear reactor and a control rod guide tube provided by an embodiment of the present invention;

[0050] Fig.12 for Fig.11 A partial enlarged view of point B in the middle.

[0051] Description of Figure Numbers:

[0052] 100. Positioning device;

[0053] 110, first positioning column; 120, second positioning column; 130, positioning plate; 140, guide block;

[0054] 131, avoidance hole; 132, fixing hole;

[0055] 141. inclined side wall; 142. housing; 143. second elastic member;

[0056] 200. Processing equipment;

[0057] 210, first drive assembly; 220, second drive assembly; 230, cutter head assembly; 240, rotation 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 member;

[0061] 23221, guide rod; 23222, second connecting rod;

[0062] 2331, first transmission member; 2332, second transmission member;

[0063] 241. third driving assembly; 242. turntable; 243. blocking member;

[0064] 2421, installation part; 2422, processing space;

[0065] 2431, avoidance hole;

[0066] 300. Lifting device;

[0067] 310, suspension rod; 320, level monitoring assembly; 330, level adjustment assembly;

[0068] 400. Foreign matter collection device;

[0069] 410, suction device; 420, water blowing device; 430, foreign body protection cover;

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

[0071] 421. fourth driving assembly; 422. water blowing pipe;

[0072] 500, lifting position sensor;

[0073] 600, Rotational position sensor;

[0074] 700, water blowing pipe position sensor;

[0075] 800. Fixed column.

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

[0077] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0079] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or", "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0080] The reactor pressure vessel thermowell provides guidance for the control rod drive rod and limits the flow of high-temperature water in the core into the control rod drive mechanism (CRDM). During operation, the thermowell will wear due to flow-induced vibration. The wear will extend on the concave surface of the inner hole of the CRDM tube seat and the flange surface of the thermowell until the flange is completely worn. If the flange of the thermowell is completely worn, the thermowell will prolapse to the upper part of the control rod guide tube (CRGT) to form a foreign body.

[0081] In order to reduce the wear of the thermal sleeve flange, a method of installing a pad above the control rod guide cylinder is usually adopted so that the guide cover at the bottom of the thermal sleeve can fall on the pad. Before installing the pad above the control rod guide cylinder, it is necessary to remotely process threaded holes on the upper surface of the control rod guide cylinder online underwater to provide installation and fixing holes for the pad. However, due to the small 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 cylinder underwater. Therefore, a device for remotely processing threaded holes on the surface of the control rod guide cylinder underwater is needed.

[0082] Based on this, in order to solve the technical problem that it is not convenient to process threaded holes on the upper surface of the control rod guide tube underwater, refer to Figures 1 to 12 An embodiment of the present invention provides a nuclear reactor control rod guide tube screw hole forming device, which is used for underwater remote processing of threaded holes on the upper surface of the control rod guide tube. The forming device includes a positioning device 100, a processing device 200 and a hoisting device 300. The positioning device 100 includes a first positioning column 110 and a second positioning column 120 arranged at intervals, and the first positioning column 110 and the second positioning column 120 are suitable for connecting 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. The first drive assembly 210 and the second drive assembly 220 are both 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 (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 cutter head assembly 230 is synchronously driven to feed and rotate vertically by the first drive assembly 210 and the second drive assembly 220, so that the cutter head assembly 230 processes a threaded hole on the upper surface of the control rod guide cylinder. The positioning device 100 and the processing device 200 are both arranged on the hoisting device 300, and are hoisted by the hoisting device 300 into the water. For example, the hoisting device 300 can include a lifting ring and a suspension rod 310, and the lifting ring is arranged at the top of the suspension rod 310. The number of the lifting rings and the lifting rod 310 and the length of the lifting rod 310 can be adjusted adaptively according to the actual processing conditions. The lifting device 300 is suitable for connecting the lifting equipment. After the lifting equipment is connected to the lifting device 300, the molding device can be lifted underwater.

[0083] Specifically, in this embodiment, when the threaded hole is processed on the upper surface of the control rod guide cylinder by remote underwater use of the molding device, first, the molding device is gradually lowered to the underwater target position by using the hoisting device 300. In the process of hoisting the molding device underwater, it can be confirmed by underwater television whether the molding device is hoisted in place. Then, after confirming that the molding device is hoisted in place underwater, the first positioning column 110 is inserted into the center hole of the control rod guide cylinder to be processed, and the second positioning column 120 is inserted into the center hole of the adjacent control rod guide cylinder, and the first positioning column 110 and the second positioning column 120 are used to realize the positioning and fixing and locking of the molding device underwater. Preferably, the control rod guide cylinder plugged by the first positioning column 110 and the control rod guide cylinder plugged by the second positioning column 120 can be in a diagonal position, which can increase the layout space of the molding device and facilitate the positioning of the molding device underwater. Finally, after confirming that the molding equipment is positioned and fixed underwater, the second drive assembly 220 is started first, and the second drive assembly 220 is used to drive the cutter head assembly 230 to move in the direction close to the control rod guide cylinder, so that the cutter head assembly 230 first descends to the processing position, and then the first drive assembly 210 is started, and the first drive assembly 210 is used to drive the cutter head assembly 230 to rotate, and the second drive assembly 220 drives the cutter head assembly 230 to feed vertically, so that the cutter head assembly 230 processes blind holes or threaded holes on the upper surface of the control rod guide cylinder. Through the threaded holes processed above, the pad can be installed and fastened to the upper surface of the control rod guide cylinder, so that the guide cover at the bottom of the thermal sleeve can fall on the pad, thereby reducing the wear of the thermal sleeve flange and extending the service life of the thermal sleeve.

[0084] By using this forming equipment, threaded holes can be processed on the upper surface of the control rod guide tube remotely underwater, which greatly reduces the difficulty of opening threaded holes on the control rod guide tube and helps to improve the accuracy of processing threaded holes on the control rod guide tube. Moreover, the operator can control this forming equipment on the ground to perform underwater operations, which helps to ensure that the operator is in a safe working environment.

[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 an evasive state.

[0086] In some embodiments, reference Figure 1 , Figures 4 to 6The cutter 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 that are transmission-connected. 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. Exemplarily, for example, the first transmission member 2331 and the second transmission member 2332 can be mutually meshing gear structures, or the first transmission member 2331 and the second transmission member 2332 can also be mutually matching chain structures, or the first transmission member 2331 and the second transmission member 2332 can also be mutually matching conveyor belt structures. The first drive assembly 210 is connected to the first transmission member 2331, and the first drive assembly 210 is used to drive 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 suitable for connecting to a driving rod, and the driving rod 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 processing the 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 processing 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, first start the second drive component 220, and the second drive component 220 drives the drilling mechanism 231 and the tapping mechanism 232 to descend together in the direction close to the control rod guide cylinder. When the bottom end of the drilling mechanism 231 reaches the drilling position, start the first drive component 210 again, and at the same time, the second drive component 220 slows down the descending speed of the drilling mechanism 231 and the tapping mechanism 232 to realize the descending drilling of the drilling mechanism 231 (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 hole depth.

[0089] When the drilling is completed, that is, the drilling depth reaches the target hole depth, the second drive assembly 220 reversely drives the drilling mechanism 231 and the tapping mechanism 232 to rise together in the direction away from the control rod guide cylinder, so that the drilling mechanism 231 and the tapping mechanism 232 exit the blind hole, and then closes the first drive assembly 210 to stop the drilling mechanism 231 from rotating.

[0090] When tapping is required in the hole after drilling is completed, the tapping mechanism 232 is first driven downward by the driving rod, so that the bottom end of the tapping mechanism 232 is lower than the bottom end of the drilling mechanism 231, and the drilling mechanism 231 is ensured to be in an avoidance state. Then the second driving assembly 220 is started, and the second driving assembly 220 drives the tapping mechanism 232 and the drilling mechanism 231 to descend toward the direction close to the control rod guide cylinder. When the bottom end of the tapping mechanism 232 reaches the tapping position, the first driving assembly 210 is started again, and at the same time, the second driving assembly 220 slows down the descending speed of the tapping mechanism 232 and the drilling mechanism 231, so as to realize the descending tapping of the tapping mechanism 232 (at this time, the drilling mechanism 231 is in an avoidance position, and the drilling mechanism 231 is in an idling state), and ensures that the tapping depth reaches the target tapping depth. It should be noted that during the tapping process, in order to better control the effect of iron chips and prevent the iron chips from being too long and causing foreign objects to get stuck, the tapping mechanism 232 needs to reciprocate until it reaches the target tapping position. For example, during the tapping process, the tapping mechanism 232 can advance the tool for 30 seconds (the feed amount is about 2.5 mm) and then retract the tool for 5 seconds (the retraction amount is about 0.5 mm) to ensure the tapping effect.

[0091] When the tapping is completed, that is, the tapping depth reaches the target tapping depth, the first drive assembly 210 rotates in the opposite direction, causing the tapping mechanism 232 to rotate in the opposite direction. At the same time, the second drive assembly 220 drives the tapping mechanism 232 and the drilling mechanism 231 in the opposite direction to rise together in a direction away from the control rod guide cylinder, causing the tapping mechanism 232 and the drilling mechanism 231 to withdraw from the threaded hole. Then, the first drive assembly 210 is closed, causing the tapping mechanism 232 to stop rotating.

[0092] In some embodiments, the drilling process can be completed in a centralized manner, and then the tapping process can be completed in a centralized manner 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 four holes can be first drilled on the upper surface of the control rod guide cylinder using the drilling mechanism 231, and then the four holes can be tapped in sequence using the tapping mechanism 232.

[0093] In this embodiment, all operations required for processing the threaded hole can be completed at one time by only one hoisting, avoiding the problem of positioning deviation caused by secondary hoisting, thereby improving the processing accuracy of the threaded hole and reducing the processing difficulty of the threaded hole. In addition, the drilling mechanism 231 and the tapping mechanism 232 are both driven to rotate by the first drive assembly 210, and are both driven to rise and fall by the second drive assembly 220, which is conducive to simplifying the overall structure of the molding equipment and reducing the overall weight of the molding 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, and is used for drilling holes and chamfering the top edge of the hole.

[0095] In some embodiments, reference 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 suitable for connecting a driving rod (exemplarily, for example, the end of the first connecting rod 23212 away from the tap head 23211 may be provided with a screwing hexagonal head, and the driving rod may be connected to the screwing hexagonal head). The first elastic member 23213 is provided 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, the second connecting rod 23222 is connected to the tap assembly 2321, and the end of the second connecting rod 23222 away from the tap assembly 2321 is suitable for connecting to a driving rod (exemplarily, for example, the end of the second connecting rod 23222 away from the tap head 23211 can be provided with a screwing hexagonal head, and the driving rod can be connected to the screwing hexagonal head), and the driving rod is used to drive the tap assembly 2321 to slide along the guide rod 23221.

[0096] Specifically, in the present embodiment, when it is necessary to use the tapping mechanism 232 to tap in the borehole, a driving rod can be externally connected to one end of the second connecting rod 23222, and the driving rod can be used to drive the tap head 23211 to descend along the guide rod 23221 in a direction close to the control rod guide cylinder (illustratively, for example, a downward thrust can be applied to the driving rod so that the driving rod can drive the tap head 23211 to descend along the guide rod 23221 in a direction close to the control rod guide cylinder, or a screwing force can be applied to the driving rod so that the driving rod drives the second connecting rod 23222 to rotate, thereby causing the nut on the second connecting rod 23222 to descend, and then the tap head 23211 is driven by the nut to descend along the guide rod 23221 in a direction close to the control rod guide cylinder), so that the bottom end of the tap head 23211 is lower than the bottom end of the drilling mechanism 231. When the tapping mechanism 232 completes tapping in all holes, the driving rod is used to drive the tap head 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 head 23211 is higher than the bottom end of the drilling mechanism 231, ensuring that the tap head 23211 is in an avoidance state.

[0097] When the driving rod drives the tap head 23211 to move up and down, the lifting position sensor 500 can be used to sense the height of the tap head 23211, so as to ensure that the tap head 23211 can be completely in an avoidance state and has sufficient feed stroke.

[0098] In addition, during the tapping operation, if the first drive assembly 210 fails, a drive rod can be connected to one end of the first connecting rod 23212, and the drive rod can be used to drive the tap head 23211 out of the threaded hole, so as to ensure that the molding equipment can be lifted for maintenance. When the drive rod is connected to the first connecting rod 23212, the first elastic member 23213 can play a buffering role to prevent the tap head 23211 from being damaged due to excessive force.

[0099] In some embodiments, reference Figure 1 , Figure 4 , Figure 7 and Figure 8 The processing device 200 also includes a rotation positioning device 240, which includes a third drive component 241 and a turntable 242. The third drive component 241 is connected to the turntable 242 and drives the turntable 242 to rotate. The turntable 242 has a mounting portion 2421 and a processing space 2422 that passes through the top and bottom. The mounting portion 2421 and the processing space 2422 are arranged radially along the turntable 242. The processing device 200 (for example, the first drive component 210, the second drive component 220 and the tool head component 230) is installed on the top of the mounting portion 2421, and the processing space 2422 is used for the drilling mechanism 231 and the tapping mechanism 232 to insert or withdraw.

[0100] Specifically, in this embodiment, the third driving assembly 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, for example, taking the case where four threaded holes need to be processed on the upper surface of the control rod guide cylinder, it is necessary to drill holes at the four positions respectively. When drilling holes at the first position, the third driving assembly 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 driving assembly 210 and the second driving assembly 220, the drilling mechanism 231 is inserted into the processing space 2422 and realizes drilling at the first position. After the first position is drilled, the drilling mechanism 231 first exits the processing space 2422, and then the third driving assembly 241 drives the turntable 242 to rotate again, and the turntable 242 drives the processing device 200 to rotate from the first position to the second position (specifically, the drilling mechanism 231 is rotated from the first position to the second position), and the drilling mechanism 231 is inserted into the processing space 2422 and drills a hole at the second position under the drive of the first driving assembly 210 and the second driving assembly 220. Referring to the above steps and by analogy, the turntable 242 drives the drilling mechanism 231 to complete drilling at the four positions.

[0101] After the four positions on the upper surface of the control rod guide cylinder are drilled, it is necessary to perform tapping in the holes at the four positions respectively. When tapping in the hole at the first position, the third driving assembly 241 drives the turntable 242 to rotate, and the turntable 242 drives the processing device 200 to rotate to the first position (specifically, the tapping mechanism 232 is aligned with the first position). Under the drive of the first driving assembly 210 and the second driving assembly 220, the tapping mechanism 232 is inserted into the processing space 2422 and tapping is performed in the hole at the first position. After the tapping is completed in the hole at the first position, the tapping mechanism 232 first withdraws from the processing space 2422, and then the third driving assembly 241 drives the turntable 242 to rotate again, and the turntable 242 drives the processing device 200 to rotate from the first position to the second position (specifically, the tapping mechanism 232 is rotated from the first position to the second position). Under the drive of the first driving assembly 210 and the second driving assembly 220, the tapping mechanism 232 is inserted into the processing space 2422 and tapping is completed in the hole at the second position. With reference to the above steps and by analogy, the turntable 242 drives the tapping mechanism 232 to complete tapping in the holes at the four positions.

[0102] The turntable 242 may be provided with a rotation position sensor 600, and the rotation position sensor 600 is used to sense whether the drilling mechanism 231 or the tapping mechanism 232 is rotated into place.

[0103] In some embodiments, reference Figure 7 and Figure 8 The third driving 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 portion 2421 and a second transmission gear, the mounting portion 2421 is fixed to the top of the second transmission gear, the second transmission gear and the first transmission gear are meshed with each other, and the first transmission gear can drive the second transmission gear to rotate. The above structure can optimize the structural layout of the rotation positioning device 240 and reasonably utilize the space of the molding equipment.

[0104] In some embodiments, reference Figure 7 , Figure 8 and Fig.10 The rotary positioning device 240 further includes a blocking member 243, which is coaxially arranged with the turntable 242 and connected to the bottom of the turntable 242. The blocking member 243 is used to block the threaded hole processed on the surface of the control rod guide cylinder. The blocking member 243 has an avoidance hole 2431 that passes through from top to bottom. Among them, the avoidance hole 2431 is provided with one, and the avoidance hole 2431 is used for inserting the drilling mechanism 231 and the tapping mechanism 232. The processing device 200 includes a position switching component, and the cutter head component 230 is connected to the position switching component, and the position switching component is used to drive the drilling mechanism 231 and the tapping mechanism 232 to switch positions.

[0105] Specifically, in this embodiment, when processing multiple threaded holes on the upper surface of the control rod guide cylinder, the drilling mechanism 231 and the tapping mechanism 232 will rotate to different processing positions with the turntable 242, so that the drilling mechanism 231 and the tapping mechanism 232 can process the threaded holes at different positions one by one. At the same time, the blocking member 243 will also rotate to different processing positions with the turntable 242, so that the avoidance hole 2431 of the blocking 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 avoidance hole 2431 to process the threaded holes on the upper surface of the control rod guide cylinder, and the non-avoidance hole area of ​​the blocking member 243 blocks other positions on the upper surface of the control rod guide cylinder, preventing foreign matter (such as iron filings) generated when processing the threaded holes from flowing into the processed threaded holes, causing contamination of the processed threaded holes.

[0106] For example, when drilling, the position switching assembly first drives the drilling mechanism 231 to switch positions, so that the drilling mechanism 231 is aligned with the avoidance hole 2431, and then the turntable 242 drives the drilling mechanism 231 and the blocking member 243 to rotate to the first processing position, so that the first processing position, the avoidance hole 2431 and the drilling mechanism 231 are on the same vertical line, and the non-avoidance hole area of ​​the blocking member 243 blocks other positions of the control rod guide cylinder. Driven by the first driving assembly 210 and the second driving assembly 220, the drilling mechanism 231 can pass through the avoidance hole 2431 and realize drilling at the first processing position. After the drilling of the first processing position is completed, the turntable 242 drives the drilling mechanism 231 and the blocking member 243 to rotate from the first processing position to the second processing position, so that the second processing position, the avoidance hole 2431 and the drilling mechanism 231 are on the same vertical line, and at the same time, the non-avoidance hole area of ​​the blocking member 243 blocks other positions of the control rod guide cylinder (especially blocks the drilling of 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 avoidance hole 2431 and realize drilling at the second processing position. Referring to the above steps and by analogy, the turntable 242 drives the drilling mechanism 231 and the blocking member 243 to rotate, ensuring that the drilling mechanism 231 completes drilling at other processing positions. Through the blocking member 243, it is possible to realize the drilling of the drilling mechanism 231 at different processing positions, and to prevent foreign matter generated during drilling from flowing into the processed borehole.

[0107] When tapping in a borehole, first the position switching assembly drives the tapping mechanism 232 to switch positions, so that the tapping mechanism 232 and the avoidance hole 2431 are aligned, and then the turntable 242 drives the tapping mechanism 232 and the blocking member 243 to rotate together to the first processing position, so that the borehole, the avoidance hole 2431 and the tapping mechanism 232 at the first processing position are on the same vertical line, and at the same time, the non-avoidance hole area of ​​the blocking member 243 blocks the boreholes at other processing positions of the control rod guide cylinder. Driven by the first drive assembly 210 and the second drive assembly 220, the tapping mechanism 232 can pass through the avoidance hole 2431 and tap in the borehole at the first processing position. Referring to the above steps and by analogy, the turntable 242 drives the tapping mechanism 232 and the blocking member 243 to rotate, ensuring that the tapping mechanism 232 completes tapping in the boreholes at other processing positions. The blocking member 243 can not only enable the tapping mechanism 232 to tap in the drilled holes at different processing positions, but also prevent foreign matter generated during tapping from flowing into the processed threaded holes.

[0108] After the processing of multiple threaded holes is completed, the turntable 242 drives the blocking member 243 to rotate, so that the non-avoidance hole area of ​​the blocking member 243 blocks all the threaded holes to ensure that no foreign matter enters the threaded holes when the device is lifted off.

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

[0110] Specifically, in this embodiment, when drilling, the turntable 242 drives the drilling mechanism 231 and the blocking member 243 to rotate together to the processing position, so that the processing position, one of the avoidance holes 2431 and the drilling mechanism 231 are on the same vertical line, ensuring that the drilling mechanism 231 can drill a hole at the processing position through one of the avoidance holes 2431. When tapping in a borehole, the turntable 242 drives the tapping mechanism 232 and the blocking member 243 to rotate together to the processing position, so that the processing position, another avoidance hole 2431 and the tapping mechanism 232 are on the same vertical line, ensuring that the tapping mechanism 232 can tap in the borehole at the processing position through another avoidance hole 2431.

[0111] It should be noted that the two avoidance holes 2431 are located close to each other, while the multiple threaded holes are spaced far apart, so the non-avoidance hole area of ​​the blocking member 243 is not affected to block other positions of the control rod guide tube.

[0112] In some embodiments, reference Figure 7 and Figure 8The molding device further includes a foreign matter collecting 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 disposed on one side of the cutter head assembly 230 along the rotation circumference 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 sucks foreign matter generated by the cutter head assembly 230 when processing the blind hole or the threaded hole. The water blowing device 420 is installed on the turntable 242 and is arranged on one side of the cutter head assembly 230 along the rotating circumference of the cutter head assembly 230. The water blowing device 420 includes a connected fourth driving assembly 421 and a water blowing pipe 422. The water blowing device 420 can rotate with the turntable 242 to align the water blowing pipe 422 with the blind hole formed by the drilling mechanism 231, or with the threaded hole formed by the tapping mechanism 232. The fourth driving 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, during the drilling and tapping process, the suction device 410 is always in working state, ensuring that foreign matter generated during drilling and tapping can be sucked by the suction device 410, so as to avoid foreign matter generated during drilling and tapping remaining underwater and causing pollution to the reactor. After each hole is drilled and each tapping is completed in the drilled hole, the water blowing pipe 422 in the water blowing device 420 needs to be extended into the drilled hole and the threaded hole to blow and stir the drilled hole and the threaded hole, so that no foreign matter remains in the drilled hole and the threaded hole, and the drilled hole and the threaded hole are kept clean.

[0114] When drilling or tapping, the suction device 410 always sucks foreign matter generated during the processing on one side of the drilling mechanism 231 or the tapping mechanism 232. When the drilling or tapping is completed, the turntable 242 drives the suction device 410 to rotate so that the suction device 410 faces the blind hole or the threaded hole, ensuring that the suction device 410 can directly suck foreign matter in the blind hole or the threaded hole. After the suction device 410 stays for a preset time, the turntable 242 drives the water blowing device 420 to rotate so that the water blowing device 420 faces the blind hole or the threaded hole, and the fourth driving component 421 can drive the water blowing pipe 422 to extend into the blind hole or the threaded hole for blowing and stirring, so that the foreign matter in the blind hole or the threaded hole is blown out and sucked by the suction device 410.

[0115] The water blowing device 420 may further include a water blowing pipe position sensor 700, which is used to sense whether the water blowing pipe 422 is lifted or lowered to a certain position, so as to prevent the water blowing pipe 422 from obstructing the rotation stroke.

[0116] In some embodiments, reference Figure 1 and Figure 2The foreign matter collecting device 400 also includes a foreign matter protection cover 430, which is arranged on the periphery of the molding device and can effectively prevent foreign matter generated during drilling or tapping from flowing to the outside of the molding device, thereby blocking and collecting foreign matter generated during drilling or tapping. The foreign matter protection cover 430 has a certain height difference with the adjacent control rod guide tube, so that the molding device can avoid the pad on the upper surface of the control rod guide tube adjacent to the control rod guide tube to be drilled, chamfered and tapped, thereby achieving full coverage of the molding device on all control rod guide tubes to be drilled, chamfered and tapped.

[0117] In some embodiments, reference Figure 7 and Figure 8 The suction device 410 includes a suction hood 411 and a suction pipe 412 . The suction pipe 412 is connected to the suction hood 411 . The end of the water blowing pipe 422 is disposed in the suction hood 411 .

[0118] Specifically, in this embodiment, when the suction device 410 sucks foreign matter 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 matter in the blind holes or threaded holes, the generated foreign matter can be collected in the suction hood 411, so that the suction pipe 412 can centrally suck the foreign matter and prevent the foreign matter from floating underwater and causing pollution to the reactor.

[0119] Preferably, the suction hood 411 may be provided with a through hole (the through hole here has a similar function to the avoidance hole 2431), through which the drilling mechanism 231 and the tapping mechanism 232 may pass, thereby ensuring that foreign matter generated during drilling or tapping may be collected in the suction hood 411, thereby preventing the foreign matter from floating arbitrarily underwater.

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

[0121] Specifically, in this embodiment, a floating structure is formed between the first positioning column 110 and the positioning plate 130, or between the second positioning column 120 and the positioning plate 130, that is, the first positioning column 110 or the second positioning column 120 can produce a slight displacement relative to the positioning plate 130. With the above structure, the first positioning column 110 or the second positioning column 120 can adapt to the assembly error between all two adjacent control rod guide cylinders on site, ensuring that the first positioning column 110 and the second positioning column 120 can be smoothly inserted into the center hole of the control rod guide cylinder, and realizing the smooth installation and positioning of the molding equipment underwater.

[0122] Reference Figure 2 and Fig.12 , corresponding to the avoidance hole 2431 of the blocking member 243, the positioning plate 130 is also provided with an avoidance hole 131 to ensure that the drilling mechanism 231 and the tapping mechanism 232 can smoothly pass through the positioning plate 130, and process the blind hole or threaded hole on the upper surface of the control rod guide cylinder. Corresponding to the fixing column 800 on the upper surface of the control rod guide cylinder, the positioning plate 130 is provided with a fixing hole 132, and the fixing column 800 can be penetrated in the fixing hole 132, thereby realizing the present molding device to process the threaded hole on the upper surface of the control rod guide cylinder.

[0123] In some embodiments, reference Figure 2 and Figure 3 The positioning device 100 includes a plurality of guide blocks 140, which are arranged at intervals around the first positioning column 110 and the second positioning column 120, and are configured to be connected to the outer periphery of the control rod guide cylinder. The guide block 140 is provided with an inclined side wall 141 on one side close to the first positioning column 110 and the second positioning column 120, and the inclined side wall 141 extends in a direction away from the first positioning column 110 and the second positioning column 120 from one end of the guide block 140 close to the positioning plate 130 to the end of the guide block 140 away from the positioning plate 130, and a shell 142 is provided on at least part of the side of the guide block 140 away from the inclined side wall 141, and a second elastic member 143 is provided between the guide block 140 and the shell 142.

[0124] Specifically, in this embodiment, the guide block 140 can be roughly positioned on the outer periphery of the corresponding control rod guide cylinder and guided in the vertical direction. The guide block 140 is provided with an inclined side wall 141, so that the guide block 140 is conveniently plugged 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 spacing between the guide block 140 and the housing 142 is changed through the elastic deformation of the second elastic member 143, so that the guide block 140 can adapt to the assembly error between two adjacent control rod guide cylinders, thereby reducing the difficulty of underwater positioning of the molding equipment.

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

[0126] In some embodiments, reference Figure 1 and Fig. 9The hoisting device 300 includes a plurality of suspension rods 310 arranged at intervals, and the hoisting device 300 also includes a horizontal monitoring component 320 and a horizontal adjustment component 330. The horizontal monitoring component 320 is arranged on the hoisting device 300, and the horizontal monitoring component 320 is used to detect the horizontality of the molding equipment. The horizontal adjustment component 330 is arranged on the hoisting device 300, and each suspension rod 310 is connected to the horizontal adjustment component 330, and the horizontal adjustment component 330 is used to adjust the length of at least one suspension rod 310 to adjust the horizontality of the molding equipment hoisting. Exemplarily, for example, the horizontal monitoring component 320 can be an electronic level, and the detection accuracy of the electronic level can be 0.01 degrees. The horizontal adjustment component 330 can be an adjustment screw.

[0127] Specifically, in this embodiment, when the molding equipment is assembled on the ground, when the horizontality of the molding equipment is tilted, the horizontal adjustment component 330 can be used to correct it. For example, when the horizontal adjustment component 330 is an adjustment screw, the adjustment screw and the suspension rod 310 are threadedly connected. Since the hoisting device 300 is provided with multiple suspension rods 310, corresponding to the multiple suspension rods 310, the hoisting device 300 can be provided with multiple adjustment screws, and a single adjustment screw can adjust a single suspension rod 310. By rotating the adjustment screw, the length of the suspension rod 310 can be changed, thereby achieving the horizontality adjustment of the molding equipment. When the threaded hole is remotely processed underwater, the horizontality of the molding equipment can be monitored in real time by the horizontal monitoring component 320.

[0128] In some embodiments, the molding device includes a monitoring device and a control system. The monitoring device is used to monitor the processing status of the processing device 200 processing the threaded hole on the upper surface of the control rod guide cylinder. The control system is connected to the monitoring device to obtain monitoring information of the monitoring device.

[0129] Correspondingly, another embodiment of the present invention further provides a method for forming a screw hole of a control rod guide tube of a nuclear reactor, wherein the forming method uses the nuclear reactor control rod guide tube screw hole forming device in any of the above embodiments to remotely process a threaded hole on the upper surface of the control rod guide tube underwater. The forming method comprises the following steps:

[0130] Step S100: hoisting the molding equipment to the underwater target position using a hoisting device;

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

[0132] Step S300: using a processing device to process threaded holes on the upper surface of the control rod guide cylinder.

[0133] The forming method is simple and efficient, which is conducive to reducing the difficulty of underwater remote processing of threaded holes and improving the processing accuracy of underwater remote processing of threaded holes.

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

[0135] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A screw hole forming device for a nuclear reactor control rod guide tube, used for underwater remote processing of threaded holes on the upper surface of a control rod guide tube, characterized in that: include: A positioning device, the positioning device comprising a first positioning column and a second positioning column arranged at intervals, the first positioning column and the second positioning column being suitable for connecting to the center holes of two adjacent control rod guide cylinders; a processing device, the processing device comprising a first drive assembly, a second drive assembly and a cutter head assembly, the first drive assembly and the second drive assembly are both connected to the cutter head assembly, the first drive assembly is used to drive the cutter head assembly to rotate, and the second drive assembly is used to drive the cutter head assembly to rise and fall, so that the cutter head assembly processes the threaded hole on the upper surface of the control rod guide cylinder; A hoisting device, wherein the positioning device and the processing device are both arranged on the hoisting device and are hoisted by the hoisting device into the water.

2. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 1, characterized in that: The cutter head assembly includes a drilling mechanism, a tapping mechanism and a transmission mechanism, wherein the transmission mechanism includes a first transmission member and a second transmission member in transmission connection, wherein the first transmission member is connected to the drilling mechanism, and the second transmission member is connected to the tapping mechanism; The first driving assembly is connected to the first transmission member, and the first driving assembly is used to drive the first transmission member to rotate so that the drilling mechanism and the tapping mechanism rotate synchronously; The tapping mechanism is suitable for connecting to a driving rod, and the driving rod 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 comprises: A tap assembly, the tap assembly comprising a tap head, a first connecting rod and a first elastic member, the tap head is connected to one end of the first connecting rod, one end of the first connecting rod away from the tap head is suitable for connecting to the driving rod, and the first elastic member is arranged between the tap head and the first connecting rod; A guide assembly, the guide assembly includes a guide rod and a second connecting rod, the tap assembly is connected to the guide rod, the second connecting rod is connected to the tap assembly, one end of the second connecting rod away from the tap assembly is suitable for connecting to the drive rod, and the drive rod 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 2, characterized in that: The processing device also includes a rotational positioning device, which includes a third drive component and a turntable. The third drive component is connected to the turntable and drives the turntable to rotate. The turntable has a mounting portion and a processing space that passes through the upper and lower parts. The mounting portion and the processing space are arranged radially along the turntable. The processing device is installed on the top of the mounting portion, and the processing space is used for the drilling mechanism and the tapping mechanism to insert or withdraw.

5. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 4, characterized in that: The rotation positioning device further includes a blocking member, which is coaxially arranged with the turntable and connected to the bottom of the turntable, and is used to block the threaded hole machined on the surface of the control rod guide cylinder, and the blocking member has an avoidance hole penetrating from top to bottom; Wherein, the avoidance hole is provided with one, the avoidance hole is used for inserting the drilling mechanism and the tapping mechanism, the processing device includes a position switching component, the cutter head component is connected to the position switching component, and the position switching component is used to drive the drilling mechanism and the tapping mechanism to switch positions; Alternatively, two avoidance holes are provided, and the two avoidance holes are respectively used for the insertion of the drilling mechanism and the tapping mechanism, wherein one of the avoidance holes is coaxially arranged with the drilling mechanism, and the other avoidance hole is coaxially arranged with the tapping mechanism.

6. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 4, characterized in that: The molding device further includes a foreign matter collecting device, and the foreign matter collecting device includes: A suction device, the suction device is mounted on the turntable and disposed on one side of the cutter head assembly along the circumferential direction of rotation of the cutter head assembly, the suction device can rotate with the turntable so that the suction device is aligned with the blind hole formed by the drilling mechanism, or aligned with the threaded hole formed by the tapping mechanism, and sucks foreign matter generated by the cutter head assembly when processing the blind hole or the threaded hole; A water blowing device, which is installed on the turntable and is arranged on one side of the cutter head assembly along the rotation circumference of the cutter head assembly. The water blowing device includes a fourth driving assembly and a water blowing pipe connected to each other. The water blowing device can rotate with the turntable so that the water blowing pipe is aligned with the blind hole formed by the drilling mechanism or the threaded hole formed by the tapping mechanism. The fourth driving assembly is used to drive the water blowing pipe to extend into or withdraw from the blind hole or the threaded hole.

7. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 6, characterized in that: The suction device comprises a suction hood and a suction pipe, the suction pipe is communicated with the suction hood, and the end of the water blowing pipe is arranged in the suction hood.

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

9. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 8, characterized in that: The positioning device comprises a plurality of guide blocks, the plurality of guide blocks are arranged at intervals around the first positioning column and the second positioning column, and the plurality of guide blocks are configured to be connected to the outer circumference of the control rod guide cylinder; Among them, an inclined side wall is provided on the side of the guide block close to the first positioning column and the second positioning column, and the inclined side wall extends from the end of the guide block close to the positioning plate to the end of the guide block away from the positioning plate in a direction away from the first positioning column and the second positioning column, and a shell is provided on at least part of the side of the guide block away from the inclined side wall, and a second elastic member is provided between the guide block and the shell.

10. The nuclear reactor control rod guide tube screw hole forming equipment according to claim 1, characterized in that: The hoisting device comprises a plurality of suspension rods arranged at intervals, and the hoisting device further comprises: A level monitoring component, the level monitoring component is arranged on the hoisting device, and the level monitoring component is used to detect the levelness of the molding equipment; A horizontal adjustment component is arranged on the hoisting device, each of the hoisting rods is connected to the horizontal adjustment component, and the horizontal adjustment component is used to adjust the length of at least one of the hoisting rods to achieve adjustment of the horizontality of the hoisting of the molding equipment.

11. A method for forming a screw hole in a control rod guide tube of a nuclear reactor, characterized in that: The threaded hole forming device for a nuclear reactor control rod guide tube according to any one of claims 1 to 10 is used to remotely process threaded holes on the upper surface of a control rod guide tube underwater; the forming method comprises: Using a lifting device to lift the molding equipment to an underwater target location; Positioning the molding device 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 by using a machining device.

Images