Device and method for cutting and disassembling lower end of nuclear fuel assembly

Abstract

The invention provides a cutting and disassembling device and method for the lower end of a nuclear fuel assembly. The cutting and disassembling device comprises a driving device arranged outside a hot chamber; the equipment base body is arranged in the hot chamber; the first transmission box body and the second transmission box body are arranged on the equipment base body, the first transmission box body is in transmission connection with a driving device outside a hot chamber through a through-wall transmission assembly, and the second transmission box body is in transmission connection with the first transmission box body through a floating butt joint structure; the end leading-in device is arranged on the first transmission box body; the clamping device, the extruding and cutting device and the source removing device are arranged on the second transmission box body. The lower end with the length exceeding the barreling requirement is cut, barreling and transferring are conducted, remote control cutting and disassembling treatment of the lower end of the assembly can be achieved, and the beneficial effects of being reliable in structure and convenient to operate are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear fuel, in particular to a device and method for cutting and disassembling the lower end of a nuclear fuel assembly. Background Art

[0002] Mechanical shearing is a common method for pre-processing fuel assemblies. After shearing, the remaining assembly ends need to be barreled and then disposed of as waste. The lower end of the nuclear fuel assembly refers to the lower tube seat of the nuclear fuel assembly. Since the lower end of the assembly is too long, it cannot be barreled directly. It needs to be cut and disassembled before barreling. Since the lower end of the assembly is highly radioactive, the mechanical shearing of the lower end of the assembly generally needs to be carried out in a hot chamber.

[0003] The power source and its supporting equipment of the current cutting and disintegration device are generally installed in a hot chamber. When the power source or the supporting equipment is damaged or fails, it is necessary to enter the hot chamber for replacement or repair, which poses a huge safety problem and wastes a lot of time and manpower. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a cutting and disassembling device and method for the lower end head of a nuclear fuel assembly, which can cut the lower end head whose length exceeds the barreling requirement and carry out barreling and transportation, and can realize remote controlled cutting and disassembly processing of the lower end head of the assembly, and has the characteristics of reliable structure and easy operation.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows: a cutting and disassembling device for the lower end of a nuclear fuel assembly, comprising:

[0006] A driving device located outside the hot room;

[0007] The equipment base is located in the hot room;

[0008] A first transmission box and a second transmission box are arranged on the equipment base, the first transmission box is transmission-connected to the driving device outside the hot room through a through-wall transmission assembly, and the second transmission box is transmission-connected to the first transmission box through a floating docking structure;

[0009] An end introduction device provided on the first transmission housing;

[0010] A clamping device, an extrusion and cutting device and a source removal device are arranged on the second transmission housing;

[0011] Among them, after the lower end head of the nuclear fuel assembly is introduced into the extrusion cutting device through the end head introduction device and the clamping device, the driving device controls the first transmission box body to retract the end head introduction device to its original position through the wall-penetrating transmission assembly, controls the second transmission box body to start the extrusion cutting device to cut the lower end head of the nuclear fuel assembly, and the component lower end head short section after cutting is withdrawn by the source removal device.

[0012] Optionally, this cutting and disassembling device further includes:

[0013] A power hand that cooperates with the end head introduction device. The power hand clamps and places the component lower end head on the end head introduction device, and when the end head introduction device, clamping device, extrusion cutting device, and / or source removal device need to be disassembled and assembled, the power hand disassembles or assembles the end head introduction device, clamping device, extrusion cutting device, and / or source removal device.

[0014] Optionally, a docking handle for controlling the front and back floating of the control floating docking structure is provided on the second transmission box body. The docking handle controls the transmission of the first transmission box body and the second transmission box body in the normal state of the second transmission box body, and controls the second transmission box body to stop transmission under the operation of the power hand after the second transmission box body fails.

[0015] Optionally, the end head introduction device includes:

[0016] An end head introduction frame provided on the first transmission box body;

[0017] A conveyor belt provided within the end head introduction frame. The first transmission box body drives the conveyor belt to work;

[0018] A guiding member provided above the conveyor belt for guiding the transmission of the component lower end head. The guiding member is fixed on the end head introduction frame.

[0019] Optionally, the clamping device includes:

[0020] A clamping frame provided on the second transmission box body;

[0021] A first sliding track and a second sliding track arranged oppositely on the clamping frame. The second transmission box body drives the first sliding track and the second sliding track to approach or separate;

[0022] Clamping jaws provided within the first sliding track and the second sliding track. The second transmission box body drives the clamping jaws to slide within the first sliding track and the second sliding track;

[0023] An emergency handle provided on the first sliding track and the second sliding track. The emergency handle is used to drive the first sliding track and the second sliding track to move away from each other.

[0024] Optionally, the extrusion cutting device comprises:

[0025] An extrusion cutting frame provided on the second transmission housing;

[0026] A slewing bearing provided on the extrusion cutting frame, wherein a through hole is provided in the middle of the slewing bearing to allow the lower end of the component to pass through;

[0027] A plane thread pair provided around the through hole of the slewing bearing;

[0028] At least one set of cutting tools is provided on the planar thread pair;

[0029] A rotation driving unit is arranged on the extrusion cutting frame and drives the cutting tool to approach or move away from the through hole along the plane thread pair.

[0030] Optionally, the source withdrawal device includes:

[0031] A source withdrawal frame provided on the second transmission housing;

[0032] A support plate provided on the source removal frame to receive the short section of the lower end of the component cut off by extrusion;

[0033] A transmission unit is arranged on the withdrawal source frame to drive the support plate forward and backward.

[0034] Optionally, the driving device is a servo motor, and a transition rod coupling is provided between the through-wall transmission assembly and the first transmission housing.

[0035] Optionally, positioning columns for installing and positioning the first transmission box and the second transmission box are provided on the equipment base, and horizontal adjustment shims are provided at the bottom of the equipment base, and the adjustment shims are fixedly connected to the embedded plate in the hot chamber.

[0036] The present invention also provides a method for cutting and disassembling the lower end of a nuclear fuel assembly, which is applied to the cutting and disassembling device as described above, comprising:

[0037] Place the lower end of the nuclear fuel assembly on the end introduction device;

[0038] The lower end of the assembly is guided by the end introduction device, and the lower end of the nuclear fuel assembly is sent to the clamping device and the extrusion cutting device;

[0039] The driving device controls the first transmission box to return the end introduction device to its original position through the through-wall transmission assembly, controls the second transmission box to start the extrusion and cutting device to cut the lower end of the nuclear fuel assembly, and the source removal device removes the cut short section of the lower end of the assembly;

[0040] Clamp the short section at the lower end of the withdrawn component into the barrel.

[0041] The above - mentioned solution of the present invention has at least the following beneficial effects:

[0042] In the above - mentioned solution of the present invention, the cutting and disassembling device cuts the lower end head of the nuclear fuel assembly whose length exceeds the barrel - loading requirement, and then conducts barrel - loading and transportation. It can realize remote - controlled cutting and disassembling treatment of the lower end head of the assembly, and has the characteristics of reliable structure and convenient operation.

[0043] The cutting and disassembling device sets the driving device outside the hot cell, changing the previous situation where the power source (driving device) was set inside the hot cell, and realizing remote control of cutting and disassembling the lower end head of the assembly outside the hot cell. When the power source is damaged or fails, there is no need for staff to enter the highly radioactive hot cell for replacement or repair, greatly reducing the risk of radiation injury to the staff and ensuring personnel safety.

[0044] Since there is no need to enter the hot cell for operation when the power source fails, it avoids the cumbersome preparation process for entering the hot cell and the complex maintenance operations inside the hot cell, saving a large amount of time. At the same time, it reduces the manpower input for preparing professional protection equipment, personnel training, and auxiliary personnel cooperation required for entering the hot cell for maintenance, effectively reducing the labor cost.

[0045] By setting the first transmission box body and the second transmission box body, and using the through - wall transmission component to realize the transmission connection between the driving device outside the hot cell and the first transmission box body inside the hot cell, and using the floating docking structure to realize the transmission connection between the two transmission box bodies. This transmission structure design is more reasonable, improving the stability and reliability of power transmission. At the same time, it is also convenient to quickly separate the corresponding components for maintenance or replacement when the equipment fails.

[0046] The end - head introduction device, clamping device, extrusion - cutting device, and source - removing device have clear division of labor, can efficiently complete the cutting and disassembling work of the lower end head of the nuclear fuel assembly according to the established process, and the operation process is clear, which is convenient for practical application.

[0047] The cutting and disassembling device adopts a modular design, including an equipment base body, an end - head introduction device, a clamping device, an extrusion - cutting device, a source - removing device, a first transmission box body, and a second transmission box body. The modular design makes each device relatively independent. When a certain device has a problem, only this device needs to be maintained or replaced separately, without affecting the normal operation of other devices. At the same time, this structure is also convenient for upgrading and transforming the equipment, replacing or adding devices with better performance according to actual needs to improve the overall performance of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic structural diagram of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0049] Figure 2It is a schematic structural diagram of the equipment base of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0050] Figure 3 It is a transmission relationship diagram of the driving device and the first transmission box body of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0051] Figure 4 It is a schematic structural diagram of the end head guiding device of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0052] Figure 5 It is a schematic structural diagram of the clamping device of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0053] Figure 6 It is a schematic structural diagram of the extrusion cutting device of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0054] Figure 7 It is a schematic position diagram of the rotary drive unit of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0055] Figure 8 It is a schematic structural diagram of the source removal device of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0056] Figure 9 It is a schematic structural diagram of the second transmission box body of the cutting and disassembling device for the lower end head of the nuclear fuel assembly of the present invention.

[0057] Figure 10 It is a flow chart of the cutting and disassembling method for the lower end head of the nuclear fuel assembly of the present invention.

[0058] Explanation of reference numerals:

[0059] 1. Equipment base; 101. Positioning column; 102. Adjusting pad; 2. Through-wall transmission assembly; 3. End introduction device; 301. End introduction frame; 302. First locking mechanism; 303. Disassembly and assembly lug; 304. Guide; 305. Conveyor belt; 4. Clamping device; 401. Clamping frame; 402. First sliding track; 403. Second sliding track; 404. Clamping claw; 405. Emergency handle; 406. Second locking mechanism; 5. Extrusion cutting device; 501. Extrusion cutting frame ; 502, slewing bearing; 503, cutting tool; 504, plane thread pair; 505, through hole; 506, third locking mechanism; 507, rotation drive unit; 6, source withdrawal device; 601, source withdrawal frame; 602, support plate; 603, transmission unit; 604, fourth locking mechanism; 7, second transmission box; 701, floating docking structure; 702, guide mechanism; 703, transmission mechanism; 704, docking handle; 8, driving device; 9, first transmission box, 10, transition rod coupling. DETAILED DESCRIPTION

[0060] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0061] like Figure 1 As shown, an embodiment of the present invention provides a cutting and disassembling device for the lower end of a nuclear fuel assembly, comprising:

[0062] A driving device 8 disposed outside the hot chamber;

[0063] An equipment base 1 is arranged in the hot room;

[0064] A first transmission box 9 and a second transmission box 7 are arranged on the equipment base 1, wherein the first transmission box 9 is transmission-connected to a driving device 8 outside the hot room via a through-wall transmission assembly 2, and the second transmission box 7 is transmission-connected to the first transmission box 9 via a floating docking structure 701;

[0065] An end introduction device 3 provided on the first transmission housing 9;

[0066] A clamping device 4, an extrusion and cutting device 5 and a source removal device 6 are arranged on the second transmission housing 7;

[0067] Among them, after the lower end head of the nuclear fuel assembly is introduced into the extrusion cutting device 5 through the end head introduction device 3 and the clamping device 4, the driving device 8 controls the first transmission box body 9 to retract the end head introduction device 3 to the original position through the wall-penetrating transmission assembly 2, controls the second transmission box body 7 to start the extrusion cutting device 5 to cut the lower end head of the nuclear fuel assembly, and the component lower end head short section after cutting is withdrawn by the source removal device 6.

[0068] This cutting and disassembling device cuts the lower end head of the nuclear fuel assembly whose length exceeds the barrel loading requirement, and performs barrel loading and transportation. It can realize the remote control cutting and disassembling treatment of the component lower end head, and has the characteristics of reliable structure and convenient operation.

[0069] This cutting and disassembling device sets the driving device 8 outside the hot cell, changing the previous situation where the power source (driving device 8) is set inside the hot cell, and realizing the remote control of cutting and disassembling the lower end head of the component outside the hot cell. When the power source is damaged or fails, there is no need for staff to enter the high-radiation hot cell for replacement or repair, greatly reducing the risk of radiation damage to the staff and ensuring personnel safety.

[0070] Since there is no need to enter the hot cell for operation when the power source fails, it avoids the cumbersome hot cell entry preparation process and the complex maintenance operations inside the hot cell, saving a lot of time. At the same time, it reduces the manpower input such as the preparation of professional protection equipment, personnel training, and the cooperation of auxiliary personnel required for entering the hot cell for maintenance, effectively reducing the labor cost.

[0071] By setting the first transmission box body 9 and the second transmission box body 7, and using the wall-penetrating transmission assembly 2 to realize the transmission connection between the driving device 8 outside the hot cell and the first transmission box body 9 inside the hot cell, and through the floating docking structure 701 to realize the transmission connection between the two transmission box bodies. This transmission structure design is more reasonable, improving the stability and reliability of power transmission, and at the same time facilitating the quick separation of corresponding components for maintenance or replacement when the equipment fails.

[0072] The end head introduction device 3, the clamping device 4, the extrusion cutting device 5, and the source removal device 6 have clear divisions of labor, can efficiently complete the cutting and disassembling work of the lower end head of the nuclear fuel assembly according to the established process, and the operation process is clear, which is convenient for practical application.

[0073] The cutting and disassembling device adopts a modular design, including an equipment base body 1, a head-end guiding device 3, a clamping device 4, an extrusion cutting device 5, a source removal device 6, a first transmission box body 9, and a second transmission box body 7. The modular design makes each device relatively independent. When a certain device has problems, only this device needs to be maintained or replaced separately, without affecting the normal operation of other devices. At the same time, this structure also facilitates the upgrading and transformation of the equipment. According to actual needs, devices with better performance can be replaced or added to improve the overall performance of the equipment.

[0074] In an optional embodiment of the present invention, the cutting and disassembling device further includes:

[0075] A power hand that cooperates with the head-end guiding device 3. The power hand clamps and places the lower end of the component on the head-end guiding device 3. When the head-end guiding device 3, the clamping device 4, the extrusion cutting device 5, and / or the source removal device 6 need to be disassembled or assembled, the power hand disassembles or assembles the head-end guiding device 3, the clamping device 4, the extrusion cutting device 5, and / or the source removal device 6.

[0076] In this example, the power hand cooperates with the head-end guiding device 3, and can easily clamp and place the lower end of the component on the head-end guiding device 3, simplifying the feeding process of the lower end of the component, reducing the operation difficulty, and making the starting link of the entire cutting and disassembling work easier to execute.

[0077] When the head-end guiding device 3, the clamping device 4, the extrusion cutting device 5, and the source removal device 6 need to be disassembled or assembled, the power hand can quickly complete the disassembly and installation of these devices. This enables the equipment to replace components and perform maintenance in a timely manner when a failure occurs or regular maintenance is required, avoiding affecting the production progress due to too long equipment repair time. It realizes the remote disassembly and assembly of the head-end guiding device 3, the clamping device 4, the extrusion cutting device 5, and the source removal device 6 in the hot cell.

[0078] During the entire cutting and disassembling process, the power hand undertakes key operations during feeding and equipment maintenance, reducing the complexity and time cost of manual operations, improving the overall work efficiency, and ensuring the efficient operation of the cutting and disassembling work.

[0079] Specifically, the head-end guiding device 3, the clamping device 4, the extrusion cutting device 5, and the source removal device 6 are respectively detachably and fixedly connected to the first transmission box body 9 and the second transmission box body 7 through a first locking mechanism 302, a second locking mechanism 406, a third locking mechanism 506, and a fourth locking mechanism 604. An assembly and disassembly lifting lug 303 is also provided on the first locking mechanism 302. As Figure 9 shown, a transmission mechanism 703 for driving connection with the clamping device 4, the extrusion cutting device 5, and the source removal device 6 and a guiding mechanism 702 for its installation and positioning are provided on the second transmission box body 7.

[0080] In an alternative embodiment of the present invention, a docking handle 704 for controlling the front-back floating of the control floating docking structure 701 is provided on the second transmission housing 7. The docking handle 704 controls the transmission between the first transmission housing 9 and the second transmission housing 7 in the normal state of the second transmission housing 7, and controls the second transmission housing 7 to stop transmission under the manipulation of the power hand after a failure of the second transmission housing 7.

[0081] In this example, in the normal state of the second transmission housing 7, the docking handle 704 can control the transmission between the first transmission housing 9 and the second transmission housing 7, ensuring stable power transmission between devices, enabling the entire cutting and disassembling device to continuously and smoothly perform the cutting work on the lower end of the nuclear fuel assembly, and maintaining the efficient operation of the production operation.

[0082] When a failure occurs in the second transmission housing 7, the power hand can manipulate the docking handle 704 to control the second transmission housing 7 to stop transmission, timely cutting off the power source of the faulty part, avoiding further expansion of the failure, reducing the impact on the entire system, and providing safety guarantee for subsequent fault troubleshooting and maintenance.

[0083] The setting of the docking handle 704 enables the power hand to conveniently operate and quickly stop the relevant transmission when a failure occurs in the second transmission housing 7, without complex operation procedures or additional tools, greatly improving the handling efficiency of maintenance personnel for faulty equipment and shortening the equipment downtime.

[0084] As Figure 4 shown, in an alternative embodiment of the present invention, the end head introducing device 3 includes:

[0085] An end head introducing frame 301 provided on the first transmission housing 9;

[0086] A conveyor belt 305 provided in the end head introducing frame 301, and the first transmission housing 9 drives the conveyor belt 305 to work;

[0087] A guiding member 304 for guiding the transmission of the lower end of the component above the conveyor belt 305, and the guiding member 304 is fixed on the end head introducing frame 301.

[0088] In this example, the conveyor belt 305 is used in the end head introducing device 3 to convey the lower end of the component, which is driven by the first transmission housing 9. Compared with the traditional manual handling or simple mechanical pushing method, the conveyor belt 305 can achieve continuous and stable conveyance, greatly improving the conveyance efficiency of the lower end of the component, reducing the time loss during the conveyance process, and being able to adapt to the working requirements of long time and high frequency, ensuring the efficient operation of the entire cutting and disassembling process.

[0089] The guiding member 304 is fixed on the end-introducing frame 301 and is located above the conveyor belt 305, and can accurately guide the conveyance of the lower end of the component. During the conveyance process, it ensures that the lower end of the component always maintains the correct position and orientation, avoiding situations such as deviation and jamming, providing a strong guarantee for the accurate clamping of the subsequent clamping device 4 and the precise cutting of the extrusion cutting device 5, effectively improving the accuracy and quality of cutting and disintegration, and reducing cutting mistakes and defective product rates caused by positioning deviations.

[0090] The end-introducing frame 301 serves as the support structure of the entire end-introducing device 3 and is fixed on the first transmission box body 9, providing a stable installation foundation for the conveyor belt 305 and the guiding member 304. Its stable structural design can bear the weight and impact force of the lower end of the component during the conveyance process, ensuring that the entire end-introducing device 3 can still operate reliably in a complex working environment, and reducing equipment failures and safety hazards caused by unstable structures.

[0091] As Figure 5 shown, in an optional embodiment of the present invention, the clamping device 4 includes:

[0092] A clamping frame 401 provided on the second transmission box body 7;

[0093] Oppositely arranged first sliding tracks 402 and second sliding tracks 403 provided on the clamping frame 401, and the second transmission box body 7 drives the first sliding tracks 402 and the second sliding tracks 403 to approach or separate;

[0094] Clamping jaws 404 provided in the first sliding track 402 and the second sliding track 403, and the second transmission box body 7 drives the clamping jaws 404 to slide in the first sliding track 402 and the second sliding track 403;

[0095] An emergency handle 405 provided on the first sliding track 402 and the second sliding track 403, and the emergency handle 405 is used to drive the first sliding track 402 and the second sliding track 403 to move away from each other.

[0096] In this example, the clamping device 4 is driven to approach or move away by the second transmission box body 7 by providing opposite first sliding tracks 402 and second sliding tracks 403 on the clamping frame 401, thereby driving the clamping jaws 404 to clamp the lower end of the component. It can clamp the lower ends of components of different specifications. This design can provide a stable and uniform clamping force to ensure that the lower end of the component does not shake or displace during the cutting process. In addition, the clamping jaws 404 are installed on the sliding tracks and can move axially along the lower end of the component, effectively eliminating the axial force on the lower end of the component generated when the cutting edge angle of the tool cuts into the end during the disassembly process of the lower end of the component, further ensuring the stability of the lower end of the component during the cutting process, providing a stable cutting basis for the extrusion cutting device 5, and greatly reducing the cutting quality problems caused by unstable clamping.

[0097] The second transmission box body 7 drives the clamping jaws 404 to slide within the first sliding track 402 and the second sliding track 403. On the one hand, the clamping position can be flexibly adjusted according to the lower ends of components of different specifications, improving the adaptability of the equipment to the lower ends of components of different sizes, expanding the applicable range of the equipment, and reducing the cost and time required to replace the equipment or add additional tooling due to component specification differences; on the other hand, the sliding design along the axial direction of the end can enable it to better cope with the axial force during cutting, enhancing the working stability and reliability of the equipment under different working conditions.

[0098] The emergency handle 405 provided on the first sliding track 402 and the second sliding track 403 provides additional guarantee for the safe and stable operation of the equipment. When an electrical fault or other abnormal situation causes the clamping jaws 404 to fail to release normally, the staff can operate the emergency handle 405 to drive the first sliding track 402 and the second sliding track 403 to move away from each other, thereby releasing the lower end of the component, avoiding the stagnation of the entire work process due to the failure of the clamping device 4, reducing the potential safety risks, and ensuring the continuous operation ability of the equipment.

[0099] As Figure 6 、 7 shown, in an optional embodiment of the present invention, the extrusion cutting device 5 includes:

[0100] An extrusion cutting frame 501 provided on the second transmission box body 7;

[0101] A slewing bearing 502 provided on the extrusion cutting frame 501, and a through hole 505 allowing the lower end of the component to pass through is provided through the middle of the slewing bearing 502;

[0102] A planar thread pair 504 provided around the through hole 505 of the slewing bearing 502;

[0103] At least one set of cutting tools 503 is provided on the planar thread pair 504;

[0104] A rotation driving unit 507 is disposed on the extrusion cutting frame 501 and drives the cutting tool 503 to move closer to or away from the through hole 505 along the plane thread pair 504 .

[0105] In this example, during cutting, the cutting tool 503 cooperates with the slewing support 502, and utilizes the planar thread pair 504 inside the chuck of the slewing support 502 to realize the rotation and automatic feeding of the lower end of the winding component, accurately control the cutting position and depth, meet different cutting process requirements, and reduce cutting errors and material waste.

[0106] Specifically, two sets of cutting tools 503 are arranged on the plane thread pair 504, which can cut the lower end of the component at the same time. Compared with the traditional method, the cutting efficiency is greatly improved, the cutting time is shortened, and the efficiency of the entire cutting and disassembly work is improved.

[0107] The slewing bearing 502 and the cutting tool 503 are adjustable based on the plane thread pair 504, so that the extrusion cutting device 5 can adapt to the lower ends of components of different specifications. Regardless of the diameter of the lower end of the component, accurate cutting can be achieved by adjusting the position of the cutting tool 503, thereby expanding the scope of application of the equipment and improving its versatility and practicality.

[0108] like Figure 8 As shown, in an optional embodiment of the present invention, the source withdrawal device 6 includes:

[0109] A source withdrawal frame 601 provided on the second transmission housing 7;

[0110] A support plate 602 is provided on the source removal frame 601 to receive the short section of the lower end of the component cut off by extrusion;

[0111] A transmission unit 603 is provided on the withdrawal source frame 601 to drive the support plate 602 forward and backward.

[0112] In this example, the support plate 602 of the source removal device 6 can accurately receive the short segment of the lower end of the component cut by extrusion, and the transmission unit 603 drives the support plate 602 forward and backward to remove the cut short segment in time for subsequent barreling operations. This process is efficient and smooth, reducing the residence time of the short segment in the cutting area, improving the overall work efficiency, and ensuring the continuity of the cutting and disassembly process.

[0113] The automated source removal operation of the source removal device 6 reduces manual intervention, reduces the difficulty and risk of operators in high radiation environments, and can complete short-segment evacuation work simply by controlling the transmission unit 603, thereby improving the convenience and safety of operation.

[0114] Timely remove the short section at the lower end of the component after cutting is completed, avoiding the potential damage risk to the equipment caused by the accumulation of short sections, such as jamming the transmission components of the equipment and affecting the normal operation of the equipment, ensuring the safe and stable operation of the equipment, and extending the service life of the equipment.

[0115] As Figure 3 As shown, in an alternative embodiment of the present invention, the driving device 8 is a servo motor, and a transition rod coupling 10 is provided between the wall-piercing transmission component 2 and the first transmission box body 9.

[0116] In this example, the servo motor can accurately control the operating speeds of the end-introducing device 3, the clamping device 4, the extrusion cutting device 5, and the source-removing device 6. During the clamping and cutting operations, the servo motor can accurately control the positions of each device. The servo motor has strong anti-interference ability and can operate stably in complex electromagnetic environments and industrial environments. In special environments such as hot cells, there are various electromagnetic interferences and radiation interferences, and the servo motor can effectively resist these interferences to ensure the normal operation of the equipment.

[0117] During the equipment installation process, there may be a certain axial installation error between the wall-piercing transmission component 2 and the first transmission box body 9. The transition rod coupling 10 can compensate for the axial error through its own elastic deformation or special structural design, ensuring that the power can be smoothly transmitted from the wall-piercing transmission component 2 to the first transmission box body 9, and avoiding the reduction of transmission efficiency and equipment damage caused by axial misalignment.

[0118] During the equipment operation process, impact loads may be generated during the power transmission process. For example, when the cutting tool 503 cuts into the lower end of the component, an instantaneous impact force will be generated. The transition rod coupling 10 can play a buffering role, absorb and disperse these impact loads, reduce the damage to the transmission components and the equipment, and extend the service life of the equipment.

[0119] As Figure 2 As shown, in an alternative embodiment of the present invention, positioning columns 101 for installing and positioning the first transmission box body 9 and the second transmission box body 7 are provided on the equipment base 1, and a level adjusting pad 102 is provided at the bottom of the equipment base 1. The adjusting pad 102 is fixedly connected to the embedded plate in the hot cell.

[0120] In this example, the positioning columns 101 provided on the equipment base 1 provide an accurate positioning reference for the installation of the first transmission box body 9 and the second transmission box body 7. The level adjusting pad 102 at the bottom of the equipment base 1, which is fixedly connected to the embedded plate in the hot cell, has an important role. During the equipment installation process, since the hot cell floor may be uneven, the adjusting pad 102 can ensure that the equipment base 1 is in a horizontal state through fine adjustment.

[0121] As Figure 10 shown, the present invention also provides a method for cutting and disassembling the lower end head of a nuclear fuel assembly, which is applied to the cutting and disassembling device as described above, and includes:

[0122] Step 11: Place the lower end head of the nuclear fuel assembly on the end head guiding device 3;

[0123] Step 12: Guide the lower end head of the assembly through the end head guiding device 3, and send the lower end head of the nuclear fuel assembly to the clamping device 4 and the extrusion cutting device 5;

[0124] Step 13: The driving device 8 controls the first transmission box body 9 to retract the end head guiding device 3 to its original position through the wall-penetrating transmission assembly 2, controls the second transmission box body 7 to start the extrusion cutting device 5 to cut the lower end head of the nuclear fuel assembly, and the short section of the cut lower end head of the assembly is withdrawn by the source removal device 6;

[0125] Step 14: Clamp and barrel the short section of the withdrawn lower end head of the assembly.

[0126] In this example, from placing the lower end head of the nuclear fuel assembly on the end head guiding device 3, to completing the cutting and withdrawal through the cooperation of various devices, and finally to barreling, each link is closely connected, which can quickly and accurately complete the processing of the lower end head of a single assembly, reduce the overall operation time, and improve work efficiency. By using the remotely controlled driving device 8, which is connected to the transmission box body in the hot cell through the wall-penetrating transmission assembly 2, when carrying out cutting and disassembling work in a high-radiation area, the operator does not need to enter the dangerous area, ensuring personal safety. At the same time, the entire operation process is standardized, reducing the risk of accidents.

[0127] Specifically, the specific working process of this equipment is as follows:

[0128] Step 101: The operator uses a power hand to clamp and place the lower end head of the assembly on the end head guiding device 3 of the cutting and disassembling device, and uses the power hand to dial the lower end head of the assembly to make it contact with the end head guiding device 3 to achieve the preliminary positioning of the lower end head of the assembly;

[0129] Step 102: Start the servo motor (the first transmission box body 9) of the end head guiding device 3, send the lower end head of the assembly into the clamping device 4 and the extrusion cutting device 5, and adjust the guiding stroke so that the cutting tool 503 is aligned with the middle section position of the lower end head of the assembly that needs to be cut;

[0130] Step 103: After the lower end head of the assembly is in place, the servo motor (the first transmission box body 9) of the end head guiding device 3 rotates in reverse to retract the end head guiding device 3 to its original position;

[0131] Step 104: Start the servo motor of the clamping device 4 (the second transmission housing 7) to fix the lower end of the clamping assembly. When the torque of the servo motor of the clamping device 4 (the second transmission housing 7) reaches the set value, it is determined that the lower end of the assembly has reached the clamped state, and the servo motor of the clamping device 4 (the second transmission housing 7) stops rotating and maintains the clamped state.

[0132] Step 105: Start the servo motor of the extrusion cutting device 5 (the second transmission housing 7) to start the extrusion cutting operation. After the lower end of the assembly is cut off, the servo motor of the extrusion cutting device 5 (the second transmission housing 7) judges and feeds back the end cutting signal through the torque change, the cutting tool 503 retracts to the initial state, and the short section of the lower end of the cut assembly drops into the source removal device 6.

[0133] Step 106: Reverse the servo motor of the clamping device 4 (the second transmission housing 7) to loosen the lower end of the assembly, and the source removal device 6 retracts to take out the short section of the lower end of the cut assembly, so that the power hand can pick up the short section of the lower end of the assembly.

[0134] Step 107: Operate the power hand to pick up the short section of the lower end of the cut assembly from the source removal device 6 and complete the barrel loading operation.

[0135] This equipment can cooperate with a power arm, a manipulator, or a special electric tool to realize the cutting and disassembly of the lower end of the assembly in a high-radiation area at a long distance and the remote control of the long-distance disassembly and assembly of the end head introduction device 3, the clamping device 4, the extrusion cutting device 5, and the source removal device 6 in the hot cell. At the same time, through the modular design, the time and labor consumption in the equipment disassembly and assembly process are reduced, and the maintenance efficiency is improved.

[0136] It should be noted that this method corresponds to the above system. All implementation manners in the above system embodiments are applicable to the embodiments of this method and can achieve the same technical effects.

[0137] The above is the preferred implementation manner of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A cutting and disassembling device for the lower end of a nuclear fuel assembly, characterized in that: include: A driving device (8) disposed outside the hot chamber; An equipment base (1) is arranged in the hot chamber; A first transmission box (9) and a second transmission box (7) are arranged on the equipment base (1), wherein the first transmission box (9) is transmission-connected to a drive device (8) outside the hot chamber via a through-wall transmission assembly (2), and the second transmission box (7) is transmission-connected to the first transmission box (9) via a floating docking structure (701); an end introduction device (3) provided on the first transmission housing (9); A clamping device (4), an extrusion and cutting device (5) and a source removal device (6) arranged on the second transmission housing (7); After the lower end of the nuclear fuel assembly is introduced into the extrusion and cutting device (5) through the end introduction device (3) and the clamping device (4), the driving device (8) controls the first transmission box (9) through the through-wall transmission component (2) to return the end introduction device (3) to its original position, controls the second transmission box (7) to start the extrusion and cutting device (5) to cut the lower end of the nuclear fuel assembly, and the source removal device (6) removes the cut short section of the lower end of the assembly.

2. The cutting and disassembling device for the lower end of a nuclear fuel assembly according to claim 1, characterized in that: Also includes: A power hand cooperates with the end head introduction device (3), the power hand clamps the lower end head of the component and places it on the end head introduction module (3), and the power hand removes or installs the end head introduction module (3), the clamping device (4), the extrusion cutting device (5) and / or the source removal device (6) when the end head introduction module (3), the clamping device (4), the extrusion cutting device (5) and / or the source removal device (6) need to be disassembled or assembled.

3. The cutting and disassembling device for the lower end of a nuclear fuel assembly according to claim 2, characterized in that: The second transmission housing (7) is provided with a docking handle (704) for controlling the floating docking structure (701) to float forward and backward. The docking handle (704) controls the transmission of the first transmission housing (9) and the second transmission housing (7) when the second transmission housing (7) is in a normal state, and controls the second transmission housing (7) to stop transmission under the control of the power hand when the second transmission housing (7) fails.

4. The cutting and disassembling device for the lower end of a nuclear fuel assembly according to claim 1, characterized in that: The end introduction device (3) comprises: An end introduction frame (301) provided on the first transmission housing (9); A conveyor belt (305) is arranged in the end-end introduction frame (301), and the first transmission box (9) drives the conveyor belt (305) to work; A guide member (304) is arranged above the conveyor belt (305) to guide the lower end of the assembly during transportation, and the guide member (304) is fixed on the end introduction frame (301).

5. The cutting and disassembling device for the lower end of a nuclear fuel assembly according to claim 1, characterized in that: The clamping device (4) comprises: A clamping frame (401) provided on the second transmission housing (7); A first sliding track (402) and a second sliding track (403) are arranged opposite to each other on the clamping frame (401), and the second transmission box (7) drives the first sliding track (402) and the second sliding track (403) to move closer or farther away; A clamping claw (404) is arranged in the second sliding track (403) in the first sliding track (402), and the second transmission box (7) drives the clamping claw (404) to slide in the first sliding track (402) and the second sliding track (403); An emergency handle (405) is arranged on the first sliding track (402) and the second sliding track (403), and the emergency handle (405) is used to drive the first sliding track (402) and the second sliding track (403) to move away from each other.

6. The cutting and disassembling device for the lower end of a nuclear fuel assembly according to claim 1, characterized in that: The extrusion and cutting device (5) comprises: An extrusion and cutting frame (501) provided on the second transmission housing (7); A slewing bearing (502) is arranged on the extrusion cutting frame (501), wherein a through hole (505) is provided in the middle of the slewing bearing (502) to allow the lower end of the component to pass through; A plane thread pair (504) provided around the through hole (505) of the slewing bearing (502); At least one set of cutting tools (503) is provided on the planar thread pair (504); A rotation driving unit (507) is provided on the extrusion cutting frame (501) and drives the cutting tool (503) along the plane thread pair (504) to approach or move away from the through hole (505).

7. The cutting and disassembling device for the lower end of a nuclear fuel assembly according to claim 1, characterized in that: The source removal device (6) comprises: A source withdrawal frame (601) provided on the second transmission housing (7); A support plate (602) is arranged on the source removal frame (601) to receive the short section of the lower end of the component cut off by extrusion; A transmission unit (603) is provided on the withdrawal source frame (601) and drives the support plate (602) to move forward and backward.

8. The cutting and disassembling device for the lower end of a nuclear fuel assembly according to claim 1, characterized in that: The driving device (8) is a servo motor, and a transition rod coupling (10) is provided between the through-wall transmission assembly (2) and the first transmission housing (9).

9. The cutting and disassembling device for the lower end of a nuclear fuel assembly according to claim 1, characterized in that: The equipment base (1) is provided with a positioning column (101) for installing and positioning the first transmission housing (9) and the second transmission housing (7), and the bottom of the equipment base (1) is provided with a level adjustment washer (102), and the adjustment washer (102) is fixedly connected to the embedded plate in the hot chamber.

10. A method for cutting and disassembling the lower end of a nuclear fuel assembly, applied to the device for cutting and disassembling the lower end of a nuclear fuel assembly according to any one of claims 1 to 9, characterized in that: include: Placing the lower end of the nuclear fuel assembly on the end introduction device (3); The lower end of the assembly is guided by the end introduction device (3), and the lower end of the nuclear fuel assembly is sent to the clamping device (4) and the extrusion cutting device (5); The driving device (8) controls the first transmission box (9) through the wall-penetrating transmission assembly (2) to return the end-end introduction device (3) to its original position, controls the second transmission box (7) to start the extrusion and cutting device (5) to cut the lower end of the nuclear fuel assembly, and the source removal device (6) removes the cut short section of the lower end of the assembly; Clamp the short section at the lower end of the withdrawn component into the barrel.

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