Device and method for underwater processing of upper pile internal component control rod guide tube mounting bolt seizure

Abstract

The present invention belongs to the technical field of maintenance of in-service nuclear power plant internal components, and specifically relates to an underwater processing device and method for the stuck bolts of the control rod guide tube installation of the upper internal components. It includes a bolt head positioning platform, a bolt head EDM processing device, a screw EDM processing positioning platform, a screw EDM processing device, a tapping device and an underwater vacuum cleaner. The beneficial effects of the present invention are: the present invention can realize the entire process of the stuck bolts of the control rod guide tube, and the whole set of equipment realizes the whole process of stuck bolt processing, hole expansion and tapping, and the size and accuracy meet the requirements of the installation technical specifications. By combining underwater EDM technology, long-distance cutting and high-precision hole expansion are realized, and the hole forming accuracy is controlled within 0.5mm. At the same time, through remote control, the collective dose and labor intensity of the operators are reduced. Through the application of underwater vacuum cleaners, the goal of foreign body control in the water pool is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of overhaul of in-service nuclear power plant internal components, and in particular relates to an underwater processing device and method for the stuck mounting bolts of a control rod guide tube of an upper internal component. Background Art

[0002] The control rod guide cylinder of the upper internals of a nuclear reactor is an important key component of the internals. Its function is to allow the reactor control rod assembly to move up and down inside it, and to provide guidance and positioning for the control rod assembly. The control rod guide cylinder is divided into two parts: the upper guide cylinder and the lower guide cylinder. The two parts are back to back through the upper and lower flanges and fixed to the upper internals support plate by bolts. When the guide cylinder fails or wears out of tolerance, it needs to be replaced as a whole. The connecting bolts may be stuck during the removal process due to being under high temperature and high pressure conditions for a long time. At this time, special methods are required to remove the faulty bolts and ensure that the new guide cylinder can be smoothly reinstalled.

[0003] Currently, there is no technology or equipment specifically designed to handle emergency situations where the control rod guide tube bolts are stuck. Due to the particularity of the nuclear field, the components inside the reactor are shielded from radiation by boric acid water, so conventional bolt-seizure methods cannot be used to handle it. Summary of the invention

[0004] The purpose of the present invention is to provide an underwater processing device and method for the stuck bolts of the control rod guide tube of the upper in-core component. The device and method can be used to remove the stuck bolts, expand the hole and tap, filter the water quality, etc. when the guide tube fastening bolts are stuck during the disassembly and assembly of the control rod guide tube, and the performance is stable and reliable.

[0005] The technical solution of the present invention is as follows: an underwater processing device for the upper internal component control rod guide tube mounting bolt biting, comprising a bolt head positioning platform, a bolt head EDM processing device, a screw EDM processing positioning platform, a screw EDM processing device, a tapping device and an underwater vacuum cleaner,

[0006] The bolt head positioning platform is arranged on the outer periphery of the control rod guide tube. The bolt head and locking cap of the fastening bolt exposed above the control rod guide tube and the upper flange are removed by the bolt head EDM processing device. The bolt head positioning platform and the bolt head EDM processing device are removed. The upper guide tube is hoisted out, and the screw EDM processing positioning platform is installed. It is fixed by a long rod tool and the screw EDM processing device is installed. The screw exposed above the support plate is cut and the bottom hole of the support plate is expanded. After the expansion and fine finishing is completed, the screw EDM processing device is hoisted out, and the tapping device is installed on the screw EDM processing positioning platform. The tapping device is driven by the long rod tool to perform the tapping operation. During the entire process of EDM processing and hole expansion and tapping, an underwater vacuum cleaner is operated to remove impurities generated during the operation and iron filings generated by tapping.

[0007] The bolt head positioning platform includes a lower directional plate, a short guide rail sleeve, a guide rail mounting plate, a long guide rail sleeve, an upper end positioning shaft, an upper cover plate, an EDM head mounting plate, a first positioning pin, a first lifting joint, a first spring locking pin, a platform frame, a pneumatic hook and a first cylinder. The bolt head positioning platform provides positioning and guidance for the bolt head EDM processing device. The bolt head positioning platform is connected to a universal long rod for underwater long-distance operation through the first lifting joint, and is positioned by the lower directional plate and sleeved on the outer side of the upper guide cylinder. , connected and fixed with the guide cylinder through the pneumatic hook claw and the first spring locking pin in the locking mechanism, the lower directional plate and the upper cover plate form an overall frame through the platform frame, the guide rail short sleeve and the guide rail long sleeve are installed on the guide rail mounting plate, the guide rail mounting plate is fixed on the platform frame, the upper end positioning shaft, the EDM head mounting plate, the first positioning pin, and the first lifting joint are installed and fixed on the upper cover plate, the pneumatic hook claw and the first cylinder are installed and fixed under the first lifting joint and the upper cover plate, and the first spring locking pin is installed and fixed on the platform frame.

[0008] The bolt head EDM processing device includes a guide rail fixing seat, a connecting long rod, a fixing seat, a first hydraulic cylinder, a guide rail, a hydraulic oil pipe, a first cooling and flushing pipe, a servo valve, a second lifting joint and a second spring locking pin; wherein, the connecting long rod is connected to the fixing seat and the first hydraulic oil cylinder, the guide rail is installed on the guide rail fixing seat, the servo valve and the second spring locking pin are installed on the fixing seat, one end of the fixing seat is connected to the long rod tool through the second lifting joint to realize the disassembly and assembly of the device, the first electrode chuck is connected to the end of the connecting long rod 1, the first electrode chuck is connected to the first processing electrode, the guide rail fixing seat is fixed on the connecting long rod, the first conductive rod is connected to the processing electrode, the first hydraulic cylinder is connected to the servo valve through a bent hydraulic oil pipe, the first cooling and flushing pipe is connected to the processing electrode, and the electrode protection guide plate is fixed on the connecting long rod.

[0009] The screw EDM processing positioning platform includes a third spring locking pin, a guide lifting joint, a second directional pin, a third locating pin, a positioning seat and a support plate assembly. The support plate assembly is a plate-like structure with multiple holes on it. A conical guide lifting joint is installed in the middle position of the support plate assembly. The support plate assemblies located on both sides of the guide lifting joint are provided with third locating pins. The support plate group located on the outside of the third locating pin is installed with a third spring locking pin. A positioning seat is fixed to the lower part of the support plate assembly, and the fitting fixation is achieved through the conical surface section to provide axial positioning for the positioning seat. There are two third spring locking pins and third locating pins. The second directional pin is inserted in the locking screw hole of the guide cylinder to provide circumferential positioning for the positioning seat.

[0010] The screw EDM processing device is installed and fixed on the upper surface of the screw EDM processing positioning platform, and is installed and positioned by the third spring locking pin and the positioning pin. The screw EDM processing device includes a main frame, a fourth spring locking pin, a third lifting joint, a second hydraulic cylinder, a servo valve group, a second conductive rod, a second cooling and flushing pipe, a cylindrical guide rail, an electrode sliding assembly, an electrode chuck and a second processing electrode. The upper part of the main frame is a support plate, on which the servo valve group, the third lifting joint, the second conductive rod, the second cooling and flushing pipe and the second hydraulic cylinder are respectively installed. Two cylindrical guide rails are installed on one side of the lower end of the support plate of the main frame. The cylindrical guide rail is provided with an electrode sliding assembly, and the electrode chuck is installed on the electrode sliding assembly. The second processing electrode is installed on the electrode chuck, wherein the second hydraulic cylinder drives the electrode sliding assembly to move the second processing electrode, the second conductive rod, the second cooling and flushing pipe, and the electrode sliding assembly up and down on the cylindrical guide rail. The servo valve group is connected to the second hydraulic cylinder through a pipeline and controls it. The fourth spring locking pin is connected to the screw EDM processing positioning platform.

[0011] The tapping device is installed and fixed on the screw EDM processing positioning platform, and is installed and positioned by a third spring locking pin and a positioning pin. The tapping device includes a tapping box fixing seat, a tapping box, a tapping guide rail, a fifth spring locking pin, a fourth lifting joint, a tapping joint, a second cylinder and a guide rail slider. The tapping box fixing seat is a plate-shaped component located at the top of the tapping device, a fourth lifting joint is installed at the top middle position of the tapping box fixing seat, a tapping joint is also installed on the top of the tapping box fixing seat, a tapping guide rail is installed at the lower part of the tapping box fixing seat, and a guide rail slider is provided on the tapping guide rail. The guide rail slider can slide up and down along the tapping guide rail, and the movement of the tap is controlled by the internal transmission of the tapping box. The second cylinder is installed on the tapping box fixing seat and is tightly connected to the tapping box to drive the tapping box to slide on the tapping guide rail, and the tap is installed at the bottom of the tapping box through a mechanical transmission component.

[0012] The underwater vacuum cleaner includes a submersible pump, a filter cartridge, a suction nozzle tool, a filter element and a foreign matter capture basket. Two filter cartridges are connected to the lower part of the submersible pump, the upper part of one filter cartridge is connected to the suction nozzle tool through a suction pipe, and the upper part of the other filter cartridge is connected to the suction nozzle tool through a suction pipe. A foreign matter capture basket is installed inside the filter cartridge, and a filter element is installed in the foreign matter capture basket.

[0013] The bolt head positioning platform is set on the outer periphery of the control rod guide cylinder, and the bolt head and locking cap of the fastening bolt exposed above the control rod guide cylinder and the upper flange are removed by the bolt head EDM processing device. The bolt head positioning platform and the bolt head EDM processing device are dismantled, the upper guide cylinder is hoisted out, and the screw EDM processing positioning platform is installed. It is fixed by a long rod tool and installed in the screw EDM processing device. The screw exposed above the support plate is cut and the bottom hole of the support plate is expanded. After the expansion and fine finishing is completed, the screw EDM processing device is hoisted out, and the tapping device is installed on the screw EDM processing positioning platform. The long rod tool is used to drive the tapping device to perform tapping operations. During the entire process of EDM processing and hole expansion and tapping, an underwater vacuum cleaner is operated to remove impurities generated during the operation and iron filings generated by tapping.

[0014] The beneficial effects of the present invention are as follows: the present invention can realize the whole process of the control rod guide tube fastening bolt biting treatment, and the whole set of equipment realizes the whole process of biting bolt treatment, hole enlargement and tapping, and the size and accuracy meet the requirements of the installation technical specifications. By combining the underwater EDM (Electrical Discharge Machining) technology, long-distance cutting and high-precision hole enlargement are realized, and the hole forming accuracy is controlled within 0.5mm. At the same time, through remote control, the collective dose and labor intensity of the operators are reduced. Through the application of underwater dust suction device, the goal of controlling foreign matter in the pool is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall schematic diagram of the bolt head positioning platform;

[0016] Figure 2 This is a schematic diagram of the bolt head positioning platform;

[0017] Figure 3 This is a schematic diagram of the upper part of the bolt head positioning platform;

[0018] Figure 4 Positioning platform for bolt head installation Figure 1 ;

[0019] Figure 5 Positioning platform for bolt head installation Figure 2 ;

[0020] Figure 6 Schematic diagram of the EDM processing device for the bolt head Figure 1 ;

[0021] Figure 7 Schematic diagram of the EDM processing device for the bolt head Figure 2 ;

[0022] Figure 8 Insert bolt head positioning platform for bolt head EDM processing device Figure 1 ;

[0023] Fig. 9 Insert bolt head positioning platform for bolt head EDM processing device Figure 2 ;

[0024] Fig.10 This is a schematic diagram of the positioning platform for screw EDM processing;

[0025] Fig.11 Schematic diagram of screw EDM processing device Figure 1 ;

[0026] Fig.12 Schematic diagram of screw EDM processing device Figure 2 ;

[0027] Fig.13 Installation of screw EDM processing equipment Figure 1 ;

[0028] Fig.14 Installation of screw EDM processing equipment Figure 2 ;

[0029] Fig.15 For tapping device installation Figure 1 ;

[0030] Fig.16 For tapping device installation Figure 2 ;

[0031] Fig.17 For tapping device installation Figure 3 ;

[0032] Fig.18 Schematic diagram of an underwater vacuum cleaner.

[0033] In the figure: 1 lower directional plate, 2 guide rail short sleeve, 3 guide rail mounting plate, 4 guide rail long sleeve, 5 upper end positioning shaft, 6 upper cover plate, 7 EDM head mounting plate, 8 first positioning pin, 9 first lifting joint, 10 first spring locking pin, 11 platform frame, 12 pneumatic hook, 13 first cylinder, 14 upper guide cylinder, 15 guide cylinder upper flange, 16 fastening bolts and locking caps, 17 guide rail fixing seat, 18 connecting long rod, 19 second lifting joint, 20 servo valve, 21 second spring locking pin, 22 hydraulic oil pipe, 23 first processing electrode, 24 first electrode chuck, 25 electrode protection guide plate, 26 first hydraulic cylinder, 27 first cooling flushing pipe, 28 guide rail, 29 first conductive rod, 30 watertight connector, 31 lifting plate , 32 third spring locking pin, 33 guide lifting joint, 34 second directional pin, 35 third locating pin, 36 locating seat, 37 support plate assembly, 38 second hydraulic cylinder, 39 second conductive rod, 40 third lifting joint, 41 servo valve group, 42 second cooling flushing pipe, 43 electrode sliding assembly, 44 main frame, 45 second electrode chuck, 46 second processing electrode, 47 cylindrical guide rail, 48 fourth spring locking pin, 49 tapping box, 50 second cylinder, 51 tapping box fixing seat, 52 fourth lifting joint, 53 tapping joint, 54 tapping guide rail, 55 slider, 56 fifth spring locking pin, 57 tap, 58 submersible pump, 59 filter cartridge, 60 suction nozzle tool, 61 suction pipe, 62 foreign matter capture basket, 63 filter element. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The upper internal component control rod guide tube installation bolt bite underwater processing device includes a bolt head positioning platform, a bolt head EDM processing device, a screw EDM processing positioning platform, a screw EDM processing device, a tapping device and an underwater vacuum cleaner, wherein the bolt head positioning platform is mounted on the outer periphery of the control rod guide tube 14 by covering, and the bolt head EDM processing device is used to remove the bolt head and the locking cap 16 of the fastening bolt exposed above the flange 15 of the control rod guide tube 14, and then the bolt head positioning platform and the bolt head EDM processing device are removed, and the upper guide tube is hoisted out, and the screw EDM processing positioning platform is installed, and fixed with a long rod tool, and then the screw EDM processing device is installed, and the screw exposed above the support plate 37 is cut and the bottom hole of the support plate 37 is expanded. After the expansion and finishing is completed, the screw EDM processing device is hoisted out, and the tapping device is installed on the screw EDM processing positioning platform and fixed. The tapping device tapping box 49 is driven by a long rod tool, and a balancer is equipped at the same time to realize remote tapping operation. During the entire process of EDM processing and hole expansion and tapping, an underwater vacuum cleaner is operated to remove impurities generated during the operation and iron chips generated by tapping.

[0036] The bolt head positioning platform, bolt head EDM processing device, screw EDM processing positioning platform, screw EDM processing device, tapping device and underwater vacuum cleaner are made of aluminum alloy, which can withstand the corrosion of boric acid water and will not rust during long-term underwater operation. Remote disassembly and assembly points are set up to facilitate on-site installation and subsequent disassembly.

[0037] like Figure 1-3 As shown, the bolt head positioning platform includes a lower directional plate 1, a short guide rail sleeve 2, a guide rail mounting plate 3, a long guide rail sleeve 4, an upper end positioning shaft 5, an upper cover plate 6, an EDM head mounting plate 7, a first positioning pin 8, a first lifting joint 9, a first spring locking pin 10, a platform frame 11, a pneumatic hook 12, and a cylinder 13. The bolt head positioning platform mainly provides positioning and guidance for the bolt head EDM processing device. The bolt head positioning platform is connected to a long rod (the long rod is a universal long rod for underwater long-distance operation) through the first lifting joint 9, and is positioned and sleeved on the outer side of the upper guide cylinder 14 by using the lower directional plate 1, and is connected and fixed to the guide cylinder through the pneumatic hook 12 and the first spring locking pin 10 in the locking mechanism.

[0038] The lower directional plate 1 and the upper cover plate 6 form an overall frame through the platform frame 11. The short guide sleeve 2 and the long guide sleeve 4 are installed on the guide rail mounting plate 3, and the guide rail mounting plate 3 is fixed on the platform frame 11. The upper end positioning shaft 5, the EDM head mounting plate 7, the first positioning pin 8, and the first lifting joint 9 are installed and fixed on the upper cover plate 6. The pneumatic hook 12 and the cylinder 13 are installed and fixed under the first lifting joint 9 and the upper cover plate 6. The first spring locking pin 10 is installed and fixed on the platform frame 11.

[0039] like Figure 6-7 As shown, the bolt head EDM processing device mainly includes a connecting rod 18, a fixing seat 31, a guide rail 28, a hydraulic oil pipe 22, a first cooling and flushing pipe 27, a second lifting joint 19 and a second spring locking pin 21; wherein, the connecting rod 18 is connected to the fixing seat 31 and the first hydraulic oil cylinder 26 through positioning pins and screws, the guide rail 28 is installed on the guide rail fixing seat 17, the servo valve 20 and the second spring locking pin 21 are installed on the fixing seat 31, and one end of the fixing seat 31 is connected to the long rod tool through the second lifting joint 19 to realize the disassembly and assembly of the device. The end of the connecting rod 18 is connected to the first electrode chuck 24, and the first processing electrode 23 is connected to the first electrode chuck 24.

[0040] The guide rail fixing seat 17 is fixed on the connecting long rod 18 through three connecting plates, the first conductive rod 29 is connected to the processing electrode 23, the first hydraulic cylinder 26 is connected to the servo valve 20 through the bent hydraulic oil pipe 22, the first cooling flushing pipe 27 is a hose, which is connected to the processing electrode 23 and provides desalted water therefor, and the electrode protection guide plate 25 is fixed on the connecting long rod.

[0041] During installation, insert the tool through the opening on the tool holder 31 and pull it toward the guide cylinder 14. Use the underwater camera to insert the upper guide rail 28 of the EDM nut processing head device into the long guide rail sleeve 4. After gradually lowering it into place, the pin hole on the bolt head EDM processing device holder 31 and the corresponding position positioning pin 8 on the bolt head positioning platform will fully fall into place. At this time, the bolt head and locking cap can be removed by EDM processing.

[0042] like Fig.10 As shown, the screw EDM processing positioning platform cooperates with the guide cylinder mounting hole on the support plate assembly 37 through the central short cylinder of the lower positioning seat 36, and at the same time, another bottom directional pin 34 is oriented at a 180° position with the screw hole to be processed to achieve precise positioning. The guide hoisting joint 33 can be used as the hoisting interface of the positioning platform and can also provide auxiliary guidance for the installation of processing equipment. The third spring locking pin 32 realizes the fixation of the equipment on the positioning platform, and the long and short positioning pins 35 realize the accurate positioning of the equipment.

[0043] The screw EDM processing positioning platform includes a third spring locking pin 32, a guide lifting joint 33, a second directional pin 34, a third locating pin 35, a locating seat 36 and a support plate assembly 37. The support plate assembly 37 is a plate-like structure with multiple holes. A conical guide lifting joint 33 is installed in the middle position of the support plate assembly 37. The support plate assemblies 37 located on both sides of the guide lifting joint 33 are provided with third locating pins 35. The support plate assembly 37 located on the outside of the third locating pin 35 is installed with a third spring locking pin 32. A locating seat 36 is fixed to the lower part of the support plate assembly 37, which is matched and fixed by a conical surface section to provide axial positioning for the locating seat 36. There are two third spring locking pins 32 and three locating pins 35. The second directional pin 34 is inserted in the locking screw hole of the guide cylinder to provide circumferential positioning for the locating seat 36.

[0044] like Figure 11-12As shown, the screw EDM processing device is installed and fixed on the upper surface of the screw EDM processing positioning platform, and is installed and positioned by the third spring locking pin 32 and the positioning pin 35. The screw EDM processing device includes a main frame 44, a fourth spring locking pin 48, a third lifting joint 40, a second hydraulic cylinder 38, a servo valve group 41, a second conductive rod 39, a second cooling and flushing pipe 42, a cylindrical guide rail 47, an electrode sliding assembly 43, an electrode chuck 45 and a second processing electrode 46. The upper part of the main frame 44 is a support plate, on which the servo valve group 41, the third lifting joint 40, the second conductive rod 39, the second cooling and flushing pipe 42 and the second hydraulic cylinder 38 are respectively installed. Two cylindrical guide rails 47 are installed on one side of the lower end of the support plate of the main frame 44. The cylindrical guide rail 47 is provided with an electrode sliding assembly 43, the electrode sliding assembly 43 is provided with an electrode chuck 45, and the second processing electrode 46 is installed on the electrode chuck 45. The second hydraulic cylinder 38 drives the electrode sliding assembly 43 to move the second processing electrode 46, the second conductive rod 39, the second cooling and flushing pipe 42, and the electrode sliding assembly 43 up and down on the cylindrical guide rail 47. The servo valve group 41 is connected to the second hydraulic cylinder 38 through a pipeline and controls it. The fourth spring locking pin 48 is connected to the screw EDM processing positioning platform through a thread to ensure that the screw EDM processing device is stable.

[0045] like Figure 15-17 As shown, the tapping device includes a tapping box fixing seat 51, a tapping box 49, a tapping guide rail 54, a fifth spring locking pin 56, a fourth lifting joint 52, a tapping joint 53, a second cylinder 50, and a guide rail slider 55. The tapping device is installed and fixed on the screw EDM processing positioning platform, and is installed and positioned by the third spring locking pin 32 and the positioning pin 35. The tapping device is controlled by a long rod tool to perform tapping.

[0046] like Fig.17 As shown, the tapping box fixing seat 51 is a plate-shaped component located at the top of the tapping device, a fourth lifting joint 52 is installed at the middle position of the top of the tapping box fixing seat 51, a tapping joint 53 is also installed on the top of the tapping box fixing seat 51, a tapping guide rail 54 is installed at the lower part of the tapping box fixing seat 51, and a guide rail slider 55 is matched on the tapping guide rail 54, and the guide rail slider 55 can slide up and down along the tapping guide rail 54, and the tapping box 49 is installed on the tapping guide rail 54, and the tapping joint 53 can be connected to rotate by operating the long rod remotely underwater, and the tapping box 49 is driven by the internal transmission to control the action of the tapping box 49. The second cylinder 50 is installed on the tapping box fixing seat 51 and is tightly connected to the tapping box 49, and can drive the tapping box 49 to slide on the tapping guide rail 54. The tap 57 is installed at the bottom of the tapping box 49 through a mechanical transmission component. The support plate assembly 37 is a field device, and related work is carried out on it.

[0047] like Fig.18As shown, the underwater vacuum cleaner includes a submersible pump 58, a filter cartridge 59, a suction nozzle tool 60, a filter element 63, and a foreign matter capture basket 62. The underwater vacuum cleaner components are directly stored at the bottom of the refueling pool and run during the entire operation process to filter and collect impurities generated by EDM processing and tapping. Among them, the lower part of the submersible pump 58 is connected to two filter cartridges 59, the upper part of one filter cartridge is connected to the suction nozzle tool 60 through a suction pipe, and the upper part of the other filter cartridge 59 is connected to the suction nozzle tool through a suction pipe 61. The filter cartridge 59 is internally mounted with a foreign matter capture basket 62, and a filter element 63 is installed in the foreign matter capture basket 62. The suction nozzle tool 60 can be used to suck foreign matter of different specifications and sizes.

[0048] The present invention also provides an underwater treatment method for the stuck bolts of the control rod guide tube of the upper internal component, wherein the bolt head positioning platform is installed on the outer periphery of the control rod guide tube 14 by covering, and the bolt head and the locking cap 16 of the fastening bolt exposed above the flange 15 of the control rod guide tube 14 are removed by the bolt head EDM processing device, and then the bolt head positioning platform and the bolt head EDM processing device are removed, the upper guide tube is hoisted out, and the screw rod EDM processing positioning platform is installed, fixed by a long rod tool, and then the screw rod EDM processing device is installed, the screw rod exposed above the support plate 37 is cut, and the bottom hole of the support plate 37 is expanded. After the expansion and fine finishing is completed, the screw rod EDM processing device is hoisted out, and the tapping device is installed on the screw EDM processing positioning platform and fixed. The tapping device tapping box 49 is driven by the long rod tool, and a balancer is equipped at the same time to realize remote tapping operation. During the entire process of EDM processing and hole expansion and tapping, an underwater vacuum cleaner is operated to remove impurities generated during the operation and iron filings generated by tapping.

[0049] The device of the present invention has the following functions and characteristics:

[0050] It is possible to remove the cylindrical head of the bolt and the locking cap that are stuck in the guide tube in the narrow space of the adjacent guide tube, without removing the adjacent control rod guide tube during operation. The screw removal and thread bottom hole expansion are achieved by the same set of equipment. The whole set of equipment is light and occupies a small space. The positioning is simple and the installation method is simple. The personnel can remotely operate the equipment on the auxiliary bridge above the pool and stay away from highly radioactive equipment. The repeated positioning accuracy is high and good. After one installation, it is only necessary to lift out the working head of the device and fix it with a spring pin after it is in place again. The tapping device and the screw cutting and expanding equipment use the same platform to avoid position deviation caused by multiple positioning. The chips and other debris generated by the operation can be handled immediately to avoid affecting the water quality of the pool.

[0051] The key points of the present invention are: a complete set of bolt seizure treatment equipment, bolt removal and bottom hole expansion are achieved by EDM (Electrical Discharge Machining); the structural form of bolt head treatment equipment; the structural form of screw rod treatment equipment; the structural form of tapping equipment; and foreign matter and water treatment equipment for the entire process of seizure bolt treatment.

[0052] The installation process of the present invention is as follows:

[0053] Installation of bolt head positioning platform: first remove all detachable fastening bolts and locking caps 16 of the control rod guide cylinder to be processed, connect the first lifting joint 9 through special tools, slowly drop the bolt head positioning platform directly above the control rod guide cylinder 14, the direction of the EDM head mounting plate 7 of the bolt head positioning platform is consistent with the direction of the screw to be processed, gradually drop the bolt head positioning platform until the upper cover plate 6 approaches the top of the control rod guide cylinder 14, align the upper end positioning shaft 5 with the upper center hole of the guide cylinder 14 and then insert it, and at the same time align the lower directional plate 1 with the upper flange 15 of the guide cylinder to achieve accurate positioning, the bolt head positioning platform is completely in place, use a long rod tool to lock the first spring locking pin 10, and the bolt head positioning platform is fixed on the support plate assembly 36. At the same time, the piston rod of the upper first cylinder 13 is extended, and the pneumatic claw 12 is engaged with the control rod guide cylinder to achieve the fixing of the bolt head positioning platform.

[0054] Installation of the bolt head EDM processing device: The long rod tool is connected to the second lifting joint 19 of the bolt head processing device, and lowered to the vicinity of the opening of the EDM head mounting plate 7 of the bolt head positioning platform. The connecting long rod 18 is slowly inserted from the opening of the head mounting plate 7, and the guide rail 28 is observed to gradually pass through the long guide sleeve 4 and the short guide sleeve 2 of the bolt head positioning platform. At the same time, the locating pin hole of the lifting plate 31 above the bolt head EDM processing device is inserted into the locating pin 8 of the bolt head positioning platform to put the device in place, and then lock the second spring locking pin 21.

[0055] EDM processing and removal of bolt heads and operation of underwater vacuum cleaner: The servo valve 20 drives the first hydraulic cylinder 26, and controls the first machining electrode 23 through the EDM power supply to remove the cylindrical head and locking cap of the stuck fastening bolt exposed above the flange 15 on the guide cylinder. While cutting, the underwater vacuum cleaner is operated to filter the water in the pool to ensure that the water quality of the pool is not affected.

[0056] Installation of screw EDM processing positioning platform: After the head of the biting fastening bolt is removed, the upper control rod guide cylinder 14 is removed, and the screw EDM processing positioning platform guide lifting joint 33 is connected with the long rod tool, and the working plane of the positioning seat 36 is facing the bolt to be processed. The lower cylinder of the positioning seat 36 is matched with the guide cylinder mounting hole of the support plate assembly 37, and the directional pin 34 is inserted into the upper light hole section of the threaded hole on the support plate assembly 37. The positioning platform is in place, and the third spring locking pin 32 is tightened by the long rod to fix the screw EDM processing positioning platform.

[0057] Installation and EDM processing of screw EDM processing device: Use a long rod tool to connect the third lifting joint 40 of the screw EDM processing device, turn the working plane of the main frame 44 toward the bolt to be processed, align the two positioning pin holes on the bottom surface of the main frame 44 with the two positioning pins 35 on the screw EDM processing positioning platform, tighten the two fourth spring locking pins 48, and fix the screw EDM processing device on the screw EDM processing positioning platform. Through the EDM power supply control servo valve group 41, drive the second hydraulic cylinder 38 to drive the electrode sliding assembly 43 to slide on the cylindrical guide rail 47 to realize screw EDM processing and removal. During processing, deionized water is passed into the second cooling flushing pipe 42, and the second conductive rod 39 connects the power supply to the second processing electrode 46. During EDM processing, the underwater vacuum cleaner is in operation to filter the cutting pool. When the second processing electrode 46 is worn out and needs to be replaced, the screw EDM processing device is lifted out by the long rod tool, and the electrode chuck 45 is loosened to replace the electrode. After the processing is completed, the fourth spring locking pin 48 is loosened, and the long rod tool is connected to the third lifting joint 40 of the screw EDM processing device to lift out the screw EDM processing device.

[0058] Installation of tapping device and tapping of threaded bottom hole: The second cylinder 50 of the tapping device is connected to the air source to keep the tapping box 49 at the top. The long rod tool is connected to the fourth lifting joint 52 to install the tapping device on the screw EDM processing positioning platform. When the device falls, the guide lifting joint 33 in the middle of the screw EDM processing positioning platform cooperates with the tapping box fixing seat 51 for guidance. The two positioning pin holes on the tapping box fixing seat 51 cooperate with the positioning pins 35 on the screw EDM processing positioning platform to be inserted into place, and then the four fifth spring locking pins 56 are tightened to fix the tapping device. A balancer is equipped between the long rod tool and the hook, and the tapping joint 53 is connected to balance the weight through the balancer. The air source of the second cylinder 50 is disconnected, and the tapping box is controlled by the long rod operation to slowly fall to the bottom hole after the EDM hole is expanded, and then the tapping joint 53 is rotated clockwise to gradually implement the tapping operation. While tapping, the underwater vacuum cleaner is in operation, filtering the water in the tapping area and collecting the thread scraps generated by tapping in a foreign matter collection basket.

Claims

1. The upper internal component control rod guide tube mounting bolts are bitten into the underwater processing device, which is characterized by: The EDM processing device is used to process the screw threading machine and the screw head, and the screw head is used to process the screw threading machine. The screw head is used to process the screw threading machine and the screw head is used to process the screw threading machine. The screw head is used to process the screw threading machine and the screw head is used to process the screw threading machine. The screw head is used to process the screw threading machine and the screw head is used to process the screw threading machine. The screw head is used to process the screw threading machine and the screw head is used to process the screw threading machine. The screw head is used to process the screw threading machine and the screw head is used to process the screw threading machine. The screw head is used to process the screw threading machine and the screw head is used to process the screw threading machine. Plate, guide rail short sleeve, guide rail mounting plate, guide rail long sleeve, upper end positioning shaft, upper cover plate, EDM head mounting plate, first positioning pin, first lifting joint, first spring locking pin, platform frame, pneumatic hook and first cylinder, bolt head positioning platform provides positioning and guiding for bolt head EDM processing device, the bolt head positioning platform is connected with a universal long rod for underwater long-distance operation through the first lifting joint, and is positioned and sleeved on the outer side of the upper guide cylinder by the lower directional plate, and is connected and fixed to the guide cylinder through the pneumatic hook and the first spring locking pin in the locking mechanism, the lower directional plate and the upper cover plate form an overall frame through the platform frame, the guide rail short sleeve and the guide rail long sleeve are mounted on the guide rail mounting plate, the guide rail mounting plate is fixed on the platform frame, the upper end positioning shaft, EDM head mounting plate, the first positioning pin, and the first lifting joint are mounted and fixed on the upper cover plate, the pneumatic hook and the first cylinder are mounted and fixed below the first lifting joint and the upper cover plate, and the first spring locking pin is mounted and fixed on the platform frame.

2. The upper internals control rod guide tube mounting bolt-engaged underwater processing device according to claim 1, characterized in that: The bolt head EDM processing device comprises a guide rail fixing seat, a connecting long rod, a fixing seat, a hydraulic cylinder, a guide rail, a hydraulic oil pipe, a cooling and flushing pipe, a servo valve, a second lifting joint and a second spring locking pin; wherein, the connecting long rod is connected to the fixing seat and the hydraulic oil cylinder, the guide rail is installed on the guide rail fixing seat, the servo valve and the second spring locking pin are installed on the fixing seat, one end of the fixing seat is connected to the long rod tool through the second lifting joint to realize the disassembly and assembly of the device, the first electrode chuck is connected to the end of the connecting long rod, the first electrode chuck is connected to the first processing electrode, the guide rail fixing seat is fixed on the connecting long rod, the conductive rod is connected to the processing electrode, the hydraulic cylinder is connected to the servo valve through a bent hydraulic oil pipe, the cooling and flushing pipe is connected to the processing electrode, and the electrode protection guide plate is fixed on the connecting long rod.

3. The upper internals control rod guide tube mounting bolt-engaged underwater processing device according to claim 1, characterized in that: The screw EDM processing positioning platform includes a third spring locking pin, a guide lifting joint, a second directional pin, a third locating pin, a positioning seat and a support plate assembly. The support plate assembly is a plate-like structure with multiple holes on it. A conical guide lifting joint is installed in the middle position of the support plate assembly. The support plate assemblies located on both sides of the guide lifting joint are provided with third locating pins. The support plate group located on the outside of the third locating pin is installed with a third spring locking pin. A positioning seat is fixed to the lower part of the support plate assembly, and the fitting fixation is achieved through the conical surface section to provide axial positioning for the positioning seat. There are two third spring locking pins and third locating pins. The second directional pin is inserted in the locking screw hole of the guide cylinder to provide circumferential positioning for the positioning seat.

4. The upper internals control rod guide tube mounting bolt-engaged underwater processing device according to claim 1, characterized in that: The screw EDM processing device is installed and fixed on the upper surface of the screw EDM processing positioning platform, and is installed and positioned by the third spring locking pin and the positioning pin. The screw EDM processing device includes a main frame, a fourth spring locking pin, a third lifting joint, a hydraulic cylinder, a servo valve group, a conductive rod, a cooling and flushing pipe, a cylindrical guide rail, an electrode sliding assembly, an electrode chuck and a second processing electrode. The upper part of the main frame is a support plate, on which a servo valve group, a third lifting joint, a conductive rod, a cooling and flushing pipe and a hydraulic cylinder are respectively installed. Two cylindrical guide rails are installed on one side of the lower end of the support plate of the main frame, and an electrode sliding assembly is mounted on the cylindrical guide rail. The electrode sliding assembly is installed on the electrode chuck, and the second processing electrode is installed on the electrode chuck. Among them, the hydraulic cylinder drives the electrode sliding assembly, and moves the second processing electrode, the conductive rod, the cooling and flushing pipe, and the electrode sliding assembly up and down on the cylindrical guide rail. The servo valve group is connected to the hydraulic cylinder through a pipeline and controls it. The fourth spring locking pin is connected to the screw EDM processing positioning platform.

5. The upper internals control rod guide tube mounting bolt-engaged underwater processing device according to claim 1, characterized in that: The tapping device is installed and fixed on the screw EDM processing positioning platform, and is installed and positioned by a third spring locking pin and a positioning pin. The tapping device includes a tapping box fixing seat, a tapping box, a tapping guide rail, a fifth spring locking pin, a fourth lifting joint, a tapping joint, a second cylinder and a guide rail slider. The tapping box fixing seat is a plate-shaped component located at the top of the tapping device, a fourth lifting joint is installed at the top middle position of the tapping box fixing seat, a tapping joint is also installed on the top of the tapping box fixing seat, a tapping guide rail is installed at the lower part of the tapping box fixing seat, and a guide rail slider is provided on the tapping guide rail. The guide rail slider can slide up and down along the tapping guide rail, and the movement of the tap is controlled by the internal transmission of the tapping box. The second cylinder is installed on the tapping box fixing seat and is tightly connected to the tapping box to drive the tapping box to slide on the tapping guide rail, and the tap is installed at the bottom of the tapping box through a mechanical transmission component.

6. The upper internals control rod guide tube mounting bolt-engaged underwater processing device according to claim 1, characterized in that: The underwater vacuum cleaner includes a submersible pump, a filter cartridge, a suction nozzle tool, a filter element and a foreign matter capture basket. Two filter cartridges are connected to the lower part of the submersible pump, the upper part of one filter cartridge is connected to the suction nozzle tool through a suction pipe, and the upper part of the other filter cartridge is connected to the suction nozzle tool through a suction pipe. A foreign matter capture basket is installed inside the filter cartridge, and a filter element is installed in the foreign matter capture basket.

7. A method for locking an underwater processing device by using the upper internals control rod guide tube mounting bolts as claimed in any one of claims 1 to 6, characterized in that: The bolt head positioning platform is set on the outer periphery of the control rod guide cylinder, and the bolt head and locking cap of the fastening bolt exposed above the control rod guide cylinder and the upper flange are removed by the bolt head EDM processing device. The bolt head positioning platform and the bolt head EDM processing device are dismantled, the upper guide cylinder is hoisted out, and the screw EDM processing positioning platform is installed. It is fixed by a long rod tool and installed in the screw EDM processing device. The screw exposed above the support plate is cut and the bottom hole of the support plate is expanded. After the expansion and fine finishing is completed, the screw EDM processing device is hoisted out, and the tapping device is installed on the screw EDM processing positioning platform. The long rod tool is used to drive the tapping device to perform tapping operations. During the entire process of EDM processing and hole expansion and tapping, an underwater vacuum cleaner is operated to remove impurities generated during the operation and iron filings generated by tapping.

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