Multifunctional detection device for fuel assembly

Abstract

The invention discloses a multifunctional detection device for a fuel assembly. The multifunctional detection device comprises a positioning module, an X-axis moving module, a Y-axis moving module, a grillwork width measuring module, a grillwork oxidation film measuring module and a fuel rod oxidation film measuring module. According to the multifunctional detection device for the fuel assembly, through the arrangement of the X-axis moving module and the Y-axis moving module, the measurement of different positions of the fuel assembly by the grillwork width measurement module, the grillwork oxidation film measurement module and the fuel rod oxidation film measurement module can be completed; the width of the grillwork of the fuel assembly is measured through the grillwork width measurement module, the thickness of the oxidation film of the grillwork of the fuel assembly is measured through the grillwork oxidation film measurement module, and the thickness of the oxidation film of the fuel rod of the fuel assembly is measured through the fuel rod oxidation film measurement module; multi-part multi-method detection can be carried out on the fuel assembly, and the method is of great significance in guaranteeing safe operation of the fuel assembly.

Description

Technical Field

[0001] The invention relates to the field of fuel assembly pool side inspection, in particular to a multifunctional detection device for fuel assemblies. Background Art

[0002] Fuel assemblies are subjected to high temperature, high pressure and complex chemical reactions of fission products. In a harsh working environment, they may fail due to swelling or damage. In severe cases, they may also cause leakage of radioactive materials, resulting in serious safety accidents and social impacts. Therefore, it is of great significance to regularly inspect fuel assemblies. During the overhaul and refueling of nuclear power plants, fuel assemblies are transported and stored in the spent fuel pool, where they are subjected to comprehensive ultrasonic and eddy current inspections. In order to ensure the accuracy of the inspection results and save overhaul hours and personnel doses, it is necessary to design a multifunctional fuel assembly inspection device that can perform multiple inspection processes such as ultrasonic and eddy current. At present, the existing multifunctional fuel assembly inspection devices at home and abroad have the following shortcomings and deficiencies: the current fuel assembly inspection device has poor installation and positioning accuracy; different inspection equipment is required for different inspection processes, and functional integration cannot be achieved; under the two working conditions of the fuel elevator and the bottom of the spent fuel pool, the fuel assembly cannot be fixed relative to the inspection equipment. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a multifunctional detection device for a fuel assembly.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a multifunctional detection device for fuel assembly, which includes a positioning module, an X-axis moving module, a Y-axis moving module, a grid width measuring module, a grid oxide film measuring module and a fuel rod oxide film measuring module;

[0005] The X-axis moving module is connected to the positioning module and can move along the X-axis direction of the fuel assembly;

[0006] The Y-axis moving module is connected to the X-axis moving module and can move along the Y-axis direction of the fuel assembly;

[0007] The grid width measuring module is connected to the Y-axis moving module and is used to measure the width of the grid of the fuel assembly;

[0008] The grid oxide film measuring module is connected to the Y-axis moving module and is used to measure the oxide film thickness of the grid of the fuel assembly;

[0009] The fuel rod oxide film measuring module is connected to the Y-axis moving module and is used to measure the oxide film thickness of the fuel rods of the fuel assembly.

[0010] In some embodiments, the positioning module includes a positioning frame, a lifting fixture, a first sleeve assembly, and a second sleeve assembly;

[0011] The hoisting tool is fixedly installed above the positioning frame, the first sleeve assembly and the second sleeve assembly are separately fixedly installed below the positioning frame, and the center distance between the first sleeve assembly and the second sleeve assembly is 800 mm to 900 mm;

[0012] A level is also provided on the positioning frame.

[0013] In some embodiments, the X-axis moving module includes an X-axis positioning plate fixedly connected to the positioning frame, an X-axis guide rail fixedly connected to the X-axis positioning plate, an X-axis slider movably connected to the X-axis guide rail, an X-axis moving plate fixedly connected to the X-axis slider, and an X-axis drive motor installed on the X-axis positioning plate and used to drive the X-axis moving plate to move.

[0014] In some embodiments, the Y-axis moving module includes a Y-axis guide rail fixedly connected to the X-axis moving plate, a Y-axis slider movably connected to the Y-axis guide rail, a Y-axis moving plate fixedly connected to the Y-axis slider, and a Y-axis drive motor installed on the X-axis moving plate and used to drive the Y-axis moving plate to move.

[0015] In some embodiments, the grid width measurement module includes a width measurement positioning plate fixedly connected to the Y-axis movable plate, a width measurement adjustment seat fixedly connected to the width measurement positioning plate, a width measurement guide shaft fixedly connected to the width measurement adjustment seat, a width measurement connecting piece movably connected to the width measurement guide shaft and movable on the width measurement adjustment seat, and a width measurement adjustment rod transmission-connected to the width measurement connecting piece, the width measurement adjustment rod being used to adjust the position of the width measurement connecting piece relative to the width measurement adjustment seat.

[0016] In some embodiments, the grid width measurement module further includes a width measurement mounting frame, a width measurement driver, a width measurement limit frame, a width measurement positioning shaft, and a width measurement support frame;

[0017] The width measurement mounting frame is fixedly connected to the width measurement connecting piece, the width measurement driver is mounted on the width measurement mounting frame and the output end of the width measurement driver is connected to the width measurement limit frame, the width measurement positioning shaft is fixedly connected to the width measurement limit frame, and the width measurement support frame is movably connected to the width measurement positioning shaft.

[0018] In some embodiments, the grid width measurement module further includes a width measurement center block, a first measurement jaw mounting block, a second measurement jaw mounting block, a first planar jaw portion, a second planar jaw portion, a first inclined jaw portion and a second inclined jaw portion, a first measurement limit axis and a second measurement limit axis;

[0019] The width measurement center block is movably connected to the width measurement positioning shaft, the two ends of the first measurement limit shaft are respectively connected to the width measurement center block and the width measurement support frame, and the two ends of the second measurement limit shaft are respectively connected to the width measurement center block and the width measurement support frame;

[0020] The first measuring jaw mounting block is movably connected to the first measuring limit shaft, and the second measuring jaw mounting block is movably connected to the second measuring limit shaft;

[0021] The first planar jaw portion is fixedly connected to the first measuring jaw mounting block, the first inclined jaw portion is fixedly connected to the first planar jaw portion and is inclined relative to the first planar jaw portion, and the second inclined jaw portion is fixedly connected to the second planar jaw portion and is inclined relative to the second planar jaw portion.

[0022] In some embodiments, the grid width measurement module further includes a width measurement sensor, a width measurement inductor, a sensor connection frame, a temperature sensor, and a width measurement limit switch;

[0023] The width measurement sensor is fixedly connected to the second measuring jaw mounting block, the width measurement sensor is fixedly connected to the first measuring jaw mounting block, the sensor connecting frame is fixedly connected to the width measurement limit frame, and the temperature sensor and the width measurement limit switch are both installed on the width measurement limit frame.

[0024] In some embodiments, a first measuring tension spring is connected between the first measuring jaw mounting block and the width measuring support frame, and a second measuring tension spring is connected between the second measuring jaw mounting block and the width measuring support frame;

[0025] Measuring rollers are installed on the first measuring jaw mounting block, the second measuring jaw mounting block, the first planar jaw portion, and the second planar jaw portion.

[0026] In some embodiments, the grid oxide film measurement module includes an oxide film measurement positioning plate fixedly connected to the Y-axis moving plate, an oxide film measurement mounting frame fixedly connected to the oxide film measurement positioning plate, an oxide film measurement guide rail fixedly connected to the oxide film measurement mounting frame, an oxide film measurement slider movably connected to the oxide film measurement guide rail, an oxide film measurement moving plate fixedly connected to the oxide film measurement slider, and an oxide film measurement drive motor mounted on the oxide film measurement mounting frame and used to drive the oxide film measurement moving plate to move.

[0027] In some embodiments, the grid oxide film measurement module further includes an oxide film measurement calibration connection block fixedly connected to the oxide film measurement mounting frame and an oxide film measurement calibration block fixedly connected to the oxide film measurement calibration connection block.

[0028] In some embodiments, the grid oxide film measurement module further includes an oxide film measurement limiting frame, a first oxide film measurement guide frame, a second oxide film measurement guide frame, a first grid oxide film measurement probe, and a second grid oxide film measurement probe;

[0029] The oxide film measurement limiting frame is fixedly connected to the oxide film measurement movable plate, and a limiting groove is provided on the oxide film measurement limiting frame. The first oxide film measurement guide frame and the second oxide film measurement guide frame are both installed on the limiting groove. The first grid oxide film measurement probe is installed on the first oxide film measurement guide frame, and the second grid oxide film measurement probe is installed on the second oxide film measurement guide frame. The oxide film measurement calibration block is located between the first oxide film measurement guide frame and the second oxide film measurement guide frame.

[0030] In some embodiments, the fuel rod oxide film measurement module includes a fuel rod measurement positioning plate fixedly connected to the Y-axis movable plate, a fuel rod measurement adjustment seat fixedly connected to the fuel rod measurement positioning plate, a fuel rod measurement guide shaft fixedly connected to the fuel rod measurement adjustment seat, a fuel rod measurement connecting piece movably connected to the fuel rod measurement guide shaft and movable on the fuel rod measurement adjustment seat, and a fuel rod measurement adjustment rod transmission-connected to the fuel rod measurement connecting piece, wherein the fuel rod measurement adjustment rod is used to adjust the position of the fuel rod measurement connecting piece relative to the fuel rod measurement adjustment seat.

[0031] In some embodiments, the fuel rod oxide film measurement module further includes a probe holder support, a locking wrench seat, a locking handle, a locking positioning shaft, and an adjustable stop member;

[0032] The probe holder support is fixedly connected to the fuel rod measurement connector, and a handle receiving groove for receiving the locking handle is provided on the probe holder support;

[0033] The locking wrench seat is installed on the probe holder support, and the locking positioning shaft is connected to the locking wrench seat and the probe holder support;

[0034] The locking handle is rotatably connected to the locking positioning shaft, a handle locking pin is provided on the locking handle, one end of the locking handle close to the locking positioning shaft has a handle arc portion, and the locking wrench seat is provided with a handle locking hole corresponding to the handle locking pin;

[0035] The adjustable stopper is mounted on the locking wrench seat and abuts against the arc-shaped portion of the handle.

[0036] In some embodiments, the fuel rod oxide film measurement module further includes a probe limit fixing block, a fuel rod oxide film measurement probe, a fuel rod calibration mounting frame, a plurality of fuel rod measurement calibration blocks, and a fuel rod calibration support frame;

[0037] The probe limit fixing block is fixedly connected to the locking wrench seat, and the probe limit fixing block and the locking wrench seat are used together to position and fix the fuel rod oxide film measuring probe;

[0038] The fuel rod calibration mounting frame is fixedly connected to the fuel rod calibration support frame, the end of the fuel rod oxide film measurement probe away from the locking wrench seat is positioned on the fuel rod calibration mounting frame, a plurality of fuel rod measurement calibration blocks are installed on the fuel rod calibration mounting frame, and the fuel rod oxide film measurement probe is arranged corresponding to the plurality of fuel rod measurement calibration blocks.

[0039] In some embodiments, the fuel rod oxide film measurement module further includes a camera mounting slide bar, a camera mounting frame, a lighting mounting frame, a camera, and a lighting lamp;

[0040] The camera mounting slide bar is fixedly connected to the fuel rod calibration mounting frame, the camera mounting frame and the lighting mounting frame are both sleeved on the camera mounting slide bar, the camera is fixedly connected to the camera mounting frame, and the lighting lamp is fixedly connected to the lighting mounting frame.

[0041] In some embodiments, the multifunctional detection device further includes a guide module, the guide module including a guide mounting plate, a guide cylinder, a first guide roller, a second guide roller, and a third guide roller;

[0042] The guide mounting plate is fixedly connected to the X-axis positioning plate, the guide cylinder is mounted above the guide mounting plate, and the central axes of the guide cylinder, the first sleeve assembly and the second sleeve assembly are on the same plane;

[0043] The first guide roller, the second guide roller and the third guide roller are all installed below the guide mounting plate.

[0044] In some embodiments, the first guide roller is arranged perpendicularly to the second guide roller, the second guide roller is arranged perpendicularly to the third guide roller, and the first guide roller is arranged parallel to the third guide roller;

[0045] A first roller guide block is disposed on the end of the first guide roller, and a second roller guide block is disposed on the end of the third guide roller.

[0046] The implementation of the present invention has the following beneficial effects: the multifunctional detection device for fuel assemblies can complete the measurement of different positions of the fuel assembly by the grid width measurement module, the grid oxide film measurement module and the fuel rod oxide film measurement module through the setting of the X-axis moving module and the Y-axis moving module, and the width of the grid of the fuel assembly is measured by the grid width measurement module, the oxide film thickness of the grid of the fuel assembly is measured by the grid oxide film measurement module, and the oxide film thickness of the fuel rod of the fuel assembly is measured by the fuel rod oxide film measurement module. The fuel assembly can be detected in multiple locations and by multiple methods, which is of great significance for ensuring the safe operation of the fuel assembly. As the source of reactor energy, the nuclear fuel assembly is in a high temperature, high pressure and irradiation environment for a long time, and may be bent, swollen, twisted, etc. due to environmental stress, causing the fuel assembly to fail or even break. By conducting comprehensive inspections on the fuel rods, grids, etc. of the fuel assembly, the potential failure hazards of the fuel assembly can be checked to avoid the malicious failure of the fuel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0048] Figure 1 is a schematic diagram of the overall structure of a multifunctional detection device for a fuel assembly in some embodiments of the present invention;

[0049] Figure 2 is a schematic diagram of the structure of a positioning module in some embodiments of the present invention;

[0050] Figure 3 is a schematic structural diagram of an X-axis moving module in some embodiments of the present invention;

[0051] Figure 4is a schematic structural diagram of a Y-axis moving module in some embodiments of the present invention;

[0052] Figure 5 is a schematic diagram of the first direction structure of a fuel rod oxide film measurement module in some embodiments of the present invention;

[0053] Figure 6 is a schematic diagram of the structure of a fuel rod oxide film measurement module in a second direction in some embodiments of the present invention;

[0054] Figure 7 is a partial structural schematic diagram of a fuel rod oxide film measurement module in some embodiments of the present invention;

[0055] Figure 8 yes Figure 6 A magnified schematic diagram of point A;

[0056] Fig. 9 is a schematic diagram of the first direction structure of a grid width measurement module in some embodiments of the present invention;

[0057] Fig.10 is a schematic diagram of the second direction structure of a grid width measurement module in some embodiments of the present invention;

[0058] Fig.11 is a schematic diagram of the third direction structure of the grid width measurement module in some embodiments of the present invention;

[0059] Fig.12 is a partial structural schematic diagram of a grid width measurement module in some embodiments of the present invention;

[0060] Fig.13 is a schematic diagram of the first direction structure of a grid oxide film measurement module in some embodiments of the present invention;

[0061] Fig.14 is a schematic diagram of the second direction structure of a grid oxide film measurement module in some embodiments of the present invention;

[0062] Fig.15 It is a schematic diagram of the structure of the guide module in some embodiments of the present invention. DETAILED DESCRIPTION

[0063] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0064] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0065] See also Figures 1 to 15 , is a multifunctional detection device for a fuel assembly in some embodiments of the present invention, such as Figure 1 As shown, the multifunctional detection device for fuel assembly includes a positioning module 1, an X-axis moving module 2, a Y-axis moving module 3, a grid width measuring module 4, a grid oxide film measuring module 5 and a fuel rod oxide film measuring module 6. The X-axis moving module 2 is connected to the positioning module 1 and can move along the X-axis direction of the fuel assembly; the Y-axis moving module 3 is connected to the X-axis moving module 2 and can move along the Y-axis direction of the fuel assembly; the grid width measuring module 4 is connected to the Y-axis moving module 3 and is used to measure the width of the grid of the fuel assembly; the grid oxide film measuring module 5 is connected to the Y-axis moving module 3 and is used to measure the oxide film thickness of the grid of the fuel assembly; the fuel rod oxide film measuring module 6 is connected to the Y-axis moving module 3 and is used to measure the oxide film thickness of the fuel rods of the fuel assembly.

[0066] It can be understood that the multifunctional detection device for fuel assembly can complete the measurement of different positions of the fuel assembly by the grid width measurement module 4, the grid oxide film measurement module 5 and the fuel rod oxide film measurement module 6 through the setting of the X-axis moving module 2 and the Y-axis moving module 3, and the width of the grid of the fuel assembly is measured by the grid width measurement module 4, the oxide film thickness of the grid of the fuel assembly is measured by the grid oxide film measurement module 5, and the oxide film thickness of the fuel rod of the fuel assembly is measured by the fuel rod oxide film measurement module 6. The fuel assembly can be detected in multiple locations and by multiple methods, which is of great significance to ensure the safe operation of the fuel assembly. As the source of reactor energy, the nuclear fuel assembly is in a high temperature, high pressure and irradiation environment for a long time, and may be bent, swollen, twisted, etc. due to environmental stress, causing the fuel assembly to fail or even break. By conducting comprehensive inspections on the fuel rods, grids, etc. of the fuel assembly, the potential failure hazards of the fuel assembly can be checked to avoid the malicious failure of the fuel assembly.

[0067] like Figure 2 As shown, the positioning module 1 includes a positioning frame 11, a lifting fixture 12, a first sleeve assembly 13 and a second sleeve assembly 14. The lifting fixture 12 is fixedly installed above the positioning frame 11, and the lifting fixture 12 can be connected to the lifting device of the on-site crane, and the positioning module 1 can be lifted by the lifting device. The first sleeve assembly 13 and the second sleeve assembly 14 are separately fixedly installed below the positioning frame 11, the first sleeve assembly 13 can be a short sleeve, and the second sleeve assembly 14 is a long sleeve. The first sleeve assembly 13 and the second sleeve assembly 14 can be used for the overall positioning of the positioning module 1. The first sleeve assembly 13 and the second sleeve assembly 14 can be connected to an external positioning mechanism. The center distance between the first sleeve assembly 13 and the second sleeve assembly 14 is 800mm to 900mm, and the center distance is preferably 840mm. A level 15 is also provided on the positioning frame 11 to facilitate the equipment operator to adjust the level of the equipment.

[0068] like Figure 3As shown, the X-axis moving module 2 includes an X-axis positioning plate 21 fixedly connected to the positioning frame 11, an X-axis guide rail 22 fixedly connected to the X-axis positioning plate 21, an X-axis slider 23 movably connected to the X-axis guide rail 22, an X-axis moving plate 24 fixedly connected to the X-axis slider 23, and an X-axis driving motor 25 installed on the X-axis positioning plate 21 and used to drive the X-axis moving plate 24 to move. It can be understood that the X-axis moving module 2 is an execution module that realizes the movement of the measurement module along the left and right directions of the fuel assembly inspection surface. The X-axis driving motor 25 is installed on the X-axis positioning plate 21, and the function of the X-axis driving motor 25 driving the X-axis moving plate 24 to move can be realized through the synchronous belt structure and the screw structure. The X-axis driving motor 25 can be used to drive the measurement module to move horizontally along the left and right directions of the fuel assembly.

[0069] like Figure 4 As shown, the Y-axis moving module 3 includes a Y-axis guide rail 31 fixedly connected to the X-axis moving plate 24, a Y-axis slider 32 movably connected to the Y-axis guide rail 31, a Y-axis moving plate 33 fixedly connected to the Y-axis slider 32, and a Y-axis driving motor 34 installed on the X-axis moving plate 24 and used to drive the Y-axis moving plate 33 to move. It can be understood that the Y-axis moving module 3 is an execution module that realizes the movement of the measurement module along the front and rear direction of the fuel assembly inspection surface. The function of the Y-axis driving motor 34 driving the Y-axis moving plate 33 to move can be realized through a synchronous belt structure and a screw rod structure, and the Y-axis driving motor 34 can be used to drive the measurement module to move horizontally along the front and rear direction of the fuel assembly.

[0070] like Figures 9 to 12 As shown, the grid width measurement module 4 includes a width measurement positioning plate 401 fixedly connected to the Y-axis moving plate 33, a width measurement adjustment seat 402 fixedly connected to the width measurement positioning plate 401, a width measurement guide shaft 403 fixedly connected to the width measurement adjustment seat 402, a width measurement connecting piece 404 movably connected to the width measurement guide shaft 403 and movable on the width measurement adjustment seat 402, and a width measurement adjustment rod 405 drivingly connected to the width measurement connecting piece 404, the width measurement adjustment rod 405 is used to adjust the position of the width measurement connecting piece 404 relative to the width measurement adjustment seat 402. It can be understood that the number of the width measurement guide shafts 403 is two, and the width measurement connecting piece 404 is movably connected to the two width measurement guide shafts 403, and the position of the width measurement connecting piece 404 relative to the width measurement adjustment seat 402 can be adjusted by adjusting the width measurement adjustment rod 405.

[0071] The grid width measurement module 4 further includes a width measurement mounting frame 406, a width measurement driver 407, a width measurement limit frame 408, a width measurement positioning shaft 409 and a width measurement support frame 410. The width measurement mounting frame 406 is fixedly connected to the width measurement connector 404, the width measurement driver 407 is mounted on the width measurement mounting frame 406 and the output end of the width measurement driver 407 is connected to the width measurement limit frame 408, the width measurement positioning shaft 409 is fixedly connected to the width measurement limit frame 408, and the width measurement support frame 410 is movably connected to the width measurement positioning shaft 409. It can be understood that the width measuring mounting frame 406 can be fixedly connected to the width measuring connecting piece 404 by bolts, and the width measuring driver 407 is used to drive the width measuring limit frame 408 to rotate, and also enables the width measuring support frame 410 to rotate along with the width measuring limit frame 408, so that the width measuring support frame 410 can rotate according to the inclination degree of different shapes of the grid. The width measuring support frame 410 is roughly rectangular and symmetrically arranged, and the width measuring support frame 410 is also rotatably connected to the width measurement positioning shaft 409. The width measuring support frame 410 can rotate around the width measurement positioning shaft 409 within a certain range according to the different shapes of the grid.

[0072] The grid width measurement module 4 also includes a width measurement center block 411, a first measurement clamping jaw mounting block 412, a second measurement clamping jaw mounting block 413, a first plane clamping jaw portion 414, a second plane clamping jaw portion 415, a first inclined clamping jaw portion 416 and a second inclined clamping jaw portion 417, a first measurement limit axis 418 and a second measurement limit axis 419. The width measurement center block 411 is movably connected to the width measurement positioning axis 409, and the two ends of the first measurement limit axis 418 are respectively connected to the width measurement center block 411 and the width measurement support frame 410, and the two ends of the second measurement limit axis 419 are respectively connected to the width measurement center block 411 and the width measurement support frame 410. Specifically, the number of the first measurement limit axis 418 and the second measurement limit axis 419 can be two, and the arrangement of the first measurement limit axis 418, the second measurement limit axis 419 and the width measurement positioning axis 409 can enable the width measurement center block 411 to move with the movement of the width measurement support frame 410. In addition, the first measuring jaw mounting block 412 is movably connected to the first measuring limit shaft 418, and the second measuring jaw mounting block 413 is movably connected to the second measuring limit shaft 419. The first measuring limit shaft 418 and the second measuring limit shaft 419 are also two, so that the first measuring jaw mounting block 412 and the second measuring jaw mounting block 413 can move back and forth along the length direction of the width measuring support frame 410, and can also make the first measuring jaw mounting block 412 and the second measuring jaw mounting block 413 rotate together with the width measuring support frame 410. In this embodiment, the first measuring jaw mounting block 412 and the second measuring jaw mounting block 413 are both L-shaped structures.

[0073] Further, the first plane clamping jaw portion 414 is fixedly connected to the first measuring clamping jaw mounting block 412, the first inclined clamping jaw portion 416 is fixedly connected to the first plane clamping jaw portion 414 and is arranged obliquely with the first plane clamping jaw portion 414, and the second inclined clamping jaw portion 417 is fixedly connected to the second plane clamping jaw portion 415 and is arranged obliquely with the second plane clamping jaw portion 415. It can be understood that the first plane clamping jaw portion 414 and the second plane clamping jaw portion 415 are arranged in parallel, and the first plane clamping jaw portion 414 and the second plane clamping jaw portion 415 are used to be clamped on the two sides of the grid to measure the width of the grid, and the arrangement of the first inclined clamping jaw portion 416 and the second inclined clamping jaw portion 417 can make the grid gradually change from the line contact with the inclined clamping jaw portion at the beginning of the contact to the surface contact with the plane clamping jaw portion, so that the first plane clamping jaw portion 414 and the second plane clamping jaw portion 415 can be completely attached to the two sides of the grid.

[0074] In addition, the grid width measurement module 4 also includes a width measurement sensor 420, a width measurement sensor 421, a sensor connection frame 422, a temperature sensor 423 and a width measurement limit switch 424. The width measurement sensor 420 is fixedly connected to the second measurement clamping jaw mounting block 413, and the width measurement sensor 421 is fixedly connected to the first measurement clamping jaw mounting block 412. The width measurement sensor 420 can be a displacement sensor. When the distance between the first plane clamping jaw portion 414 and the second plane clamping jaw portion 415 changes with the change of the grid width, the width measurement sensor 420 will sense the change of the grid width, thereby measuring the width of the grid. The sensor connecting frame 422 is fixedly connected to the width measuring limit frame 408, and the temperature sensor 423 and the width measuring limit switch 424 are both installed on the width measuring limit frame 408. The temperature sensor 423 can detect the temperature of the fuel assembly and the grid. The width measuring limit switch 424 is set corresponding to the measuring support frame 410, and the width measuring limit switch 424 can limit the rotation range of the width measuring support frame 410.

[0075] A first measuring tension spring 425 is connected between the first measuring clamp mounting block 412 and the width measuring support frame 410, and a second measuring tension spring 426 is connected between the second measuring clamp mounting block 413 and the width measuring support frame 410. The first measuring tension spring 425 is sleeved on the outside of the first measuring limit shaft 418, and the second measuring tension spring 426 is sleeved on the outside of the second measuring limit shaft 419. The first measuring tension spring 425 and the second measuring tension spring 426 are both arranged along the length direction of the width measuring support frame 410 to ensure that the first planar clamp portion 414 and the second planar clamp portion 415 always maintain a fit with the side of the frame when measuring the width of the frame. Measuring rollers 427 are installed on the first measuring jaw mounting block 412, the second measuring jaw mounting block 413, the first planar jaw portion 414 and the second planar jaw portion 415. The measuring rollers 427 facilitate the movement of the first measuring jaw mounting block 412, the second measuring jaw mounting block 413, the first planar jaw portion 414 and the second planar jaw portion 415 on the grid to reduce friction.

[0076] like Fig.13 and Fig.14As shown, the grid oxide film measurement module 5 includes an oxide film measurement positioning plate 501 fixedly connected to the Y-axis moving plate 33, an oxide film measurement mounting frame 502 fixedly connected to the oxide film measurement positioning plate 501, an oxide film measurement guide rail 503 fixedly connected to the oxide film measurement mounting frame 502, an oxide film measurement slider 504 movably connected to the oxide film measurement guide rail 503, an oxide film measurement moving plate 505 fixedly connected to the oxide film measurement slider 504, and an oxide film measurement driving motor 506 installed on the oxide film measurement mounting frame 502 and used to drive the oxide film measurement moving plate 505 to move. It can be understood that the oxide film measurement driving motor 506 can realize the function of the oxide film measurement driving motor 506 driving the oxide film measurement moving plate 505 to move along the Y-axis direction through a synchronous belt structure and a lead screw structure.

[0077] The grid oxide film measurement module 5 further includes an oxide film measurement calibration connection block 507 fixedly connected to the oxide film measurement mounting frame 502 and an oxide film measurement calibration block 508 fixedly connected to the oxide film measurement calibration connection block 507 . The grid oxide film measurement module 5 also includes an oxide film measurement limiting frame 509, a first oxide film measurement guide frame 510, a second oxide film measurement guide frame 511, a first grid oxide film measurement probe 512 and a second grid oxide film measurement probe 513. The oxide film measurement limiting frame 509 is fixedly connected to the oxide film measurement movable plate 505. A limiting groove 514 is provided on the oxide film measurement limiting frame 509. The first oxide film measurement guide frame 510 and the second oxide film measurement guide frame 511 are both installed on the limiting groove 514. The first grid oxide film measurement probe 512 is installed on the first oxide film measurement guide frame 510. The second grid oxide film measurement probe 513 is installed on the second oxide film measurement guide frame 511. The oxide film measurement calibration block 508 is located between the first oxide film measurement guide frame 510 and the second oxide film measurement guide frame 511.

[0078] It can be understood that the first grid oxide film measuring probe 512 and the second grid oxide film measuring probe 513 can be eddy current sensors, the principle of which is based on Faraday's law of electromagnetic induction, and various parameters are measured by detecting eddy currents in metal conductors. When the sensor probe approaches the metal conductor, the alternating current in the probe will generate an alternating magnetic field. This magnetic field will induce eddy currents in the metal conductor, and the eddy currents will generate a reverse magnetic field, affecting the strength of the original magnetic field. The oxide film thickness measurement utilizes the electromagnetic induction principle of eddy currents. When the changing electromagnetic field acts near the conductor, eddy currents will be generated in the conductor, and the size of the eddy currents changes with the distance between the changing electromagnetic field and the conductor. The oxide film thickness is detected by an eddy current sensor, and the vertical component is selected as the measurement component during measurement. The oxide film measurement calibration block 508 is used to calibrate the measurement curve of the oxide film measurement system, and the corresponding relationship between the vertical component of the eddy current signal and the oxide film thickness is established. After the benchmark is established, the oxide film thickness is measured, and the calibration is to make a corresponding relationship curve between the vertical component of the eddy current signal and the oxide film thickness. After the calibration is completed, the oxide film measurement drive motor 506 can be used to drive the first oxide film measurement guide frame 510, the second oxide film measurement guide frame 511, the first grid oxide film measurement probe 512 and the second grid oxide film measurement probe 513 to move toward the grid to measure the oxide film thickness of the grid. In addition, the setting of the limiting groove 514 can conveniently adjust the relative position between the first oxide film measurement guide frame 510 and the second oxide film measurement guide frame 511, and also adjust the distance between the first grid oxide film measurement probe 512 and the second grid oxide film measurement probe 513. The oxide film measurement mounting frame 502 is also provided with a lighting system to facilitate measurement.

[0079] like Figures 5 to 8 As shown, the fuel rod oxide film measurement module 6 includes a fuel rod measurement positioning plate 601 fixedly connected to the Y-axis moving plate 33, a fuel rod measurement adjustment seat 602 fixedly connected to the fuel rod measurement positioning plate 601, a fuel rod measurement guide shaft 603 fixedly connected to the fuel rod measurement adjustment seat 602, a fuel rod measurement connector 604 movably connected to the fuel rod measurement guide shaft 603 and movable on the fuel rod measurement adjustment seat 602, and a fuel rod measurement adjustment rod 605 drivingly connected to the fuel rod measurement connector 604, the fuel rod measurement adjustment rod 605 is used to adjust the position of the fuel rod measurement connector 604 relative to the fuel rod measurement adjustment seat 602. It can be understood that the number of the fuel rod measurement guide shafts 603 is two, and the fuel rod measurement connector 604 is movably connected to the two fuel rod measurement guide shafts 603, and the position of the fuel rod measurement connector 604 relative to the fuel rod measurement adjustment seat 602 can be adjusted by adjusting the fuel rod measurement adjustment rod 605.

[0080] The fuel rod oxide film measurement module 6 also includes a probe holder support 606, a locking wrench seat 607, a locking handle 608, a locking positioning shaft 609 and an adjustable stopper 625. The probe holder support 606 is fixedly connected to the fuel rod measurement connector 604, a handle receiving groove 610 for receiving the locking handle 608 is provided on the probe holder support 606, the locking wrench seat 607 is installed on the probe holder support 606, and the locking positioning shaft 609 is connected to the locking wrench seat 607 and the probe holder support 606. The locking handle 608 is rotationally connected to the locking positioning shaft 609, and a handle locking pin 611 is provided on the locking handle 608. The end of the locking handle 608 close to the locking positioning shaft 609 has a handle arc portion 6091, and the locking wrench seat 607 is provided with a handle locking hole 612 corresponding to the handle locking pin 611. The adjustable stop member 625 is installed on the locking wrench seat 607 and abuts against the handle arc portion 6091.

[0081] It can be understood that the probe holder support 606 can be fixedly connected to the fuel rod measurement connector 604 by bolts, and the locking positioning shaft 609 can be threadedly connected to the locking wrench seat 607, and one end of the locking positioning shaft 609 is positioned in the positioning hole of the probe holder support 606. Since the locking handle 608 is rotatably connected to the locking positioning shaft 609, the locking handle 608 can rotate around the locking positioning shaft 609 and rotate back and forth between the position where the handle locking hole 612 is provided and the handle receiving groove 610. In addition, the adjustable stopper 625 can be threadedly connected to the locking wrench seat 607, and it abuts against the handle arc portion 6091 to limit the movement of the locking handle 608. The handle locking pin 611 can be a spring positioning pin. When the locking handle 608 is located in the handle receiving groove 610, the handle arc portion 6091 abuts against the adjustable stopper 625, so that there is friction between the locking handle 608 and the adjustable stopper 625, and the locking wrench seat 607 and the probe holder support 606 are in a relatively fixed state. When the locking handle 608 is rotated and turned to the position of the handle locking hole 612, the handle arc portion 6091 no longer abuts against the adjustable stopper 625, and the handle locking pin 611 enters the handle locking hole 612, and then the locking handle 608 is pushed along the extension direction of the locking positioning shaft 609, and the locking wrench seat 607 can be taken out together with the components connected thereto, such as the locking wrench seat 607 and the fuel rod oxide film measurement probe 614 described below, so that the function of quick disassembly can be realized.

[0082] The fuel rod oxide film measurement module 6 also includes a probe limit fixing block 613, a fuel rod oxide film measurement probe 614, a fuel rod calibration mounting frame 615, a plurality of fuel rod measurement calibration blocks 616, and a fuel rod calibration support frame 617. The probe limit fixing block 613 is fixedly connected to the locking wrench seat 607, and the probe limit fixing block 613 and the locking wrench seat 607 are used together to position and fix the fuel rod oxide film measurement probe 614, the fuel rod calibration mounting frame 615 is fixedly connected to the fuel rod calibration support frame 617, and the end of the fuel rod oxide film measurement probe 614 away from the locking wrench seat 607 is positioned on the fuel rod calibration mounting frame 615, and a plurality of fuel rod measurement calibration blocks 616 are installed on the fuel rod calibration mounting frame 615, and the fuel rod oxide film measurement probe 614 is correspondingly arranged with the plurality of fuel rod measurement calibration blocks 616. The fuel rod calibration support frame 617 can be installed on the X-axis moving plate 24. It can be understood that the fuel rod oxide film measuring probe 614 can be an eddy current sensor, which is used to detect the oxide film thickness. When measuring, the vertical component is selected as the measurement component, and the fuel rod measurement calibration block 616 is used to calibrate the measurement curve of the oxide film measurement system, establish the corresponding relationship between the vertical component of the eddy current signal and the oxide film thickness, and measure the oxide film thickness after the benchmark is established. The calibration is to make a corresponding relationship curve between the vertical component of the eddy current signal and the oxide film thickness. The multiple fuel rod measurement calibration blocks 616 can be made according to the fuel rods to be measured. After the calibration is completed, the fuel rod oxide film measuring probe 614 can be used to measure the oxide film thickness of the fuel rod.

[0083] The fuel rod oxide film measurement module 6 also includes a camera mounting slide bar 618, a camera mounting frame 619, an illumination mounting frame 620, a camera 621 and an illumination lamp 622. The camera mounting slide bar 618 is fixedly connected to the fuel rod calibration mounting frame 615, the camera mounting frame 619 and the illumination mounting frame 620 are both sleeved on the camera mounting slide bar 618, the camera 621 is fixedly connected to the camera mounting frame 619, and the illumination lamp 622 is fixedly connected to the illumination mounting frame 620. It can be understood that the camera mounting frame 619 and the illumination mounting frame 620 can both adjust the height position along the axial direction of the camera mounting slide bar 618, the illumination mounting frame 620 is located above the camera mounting frame 619, and the illumination lamp 622 can be an LED lamp. The camera 621 and the illumination lamp 622 work together to facilitate the fuel rod oxide film measurement probe 614 to measure the oxide film thickness of the fuel rod.

[0084] like Fig.15As shown, the multifunctional detection device also includes a guide module 7, which includes a guide mounting plate 71, a guide cylinder 72, a first guide roller 73, a second guide roller 74 and a third guide roller 75. The guide mounting plate 71 is fixedly connected to the X-axis positioning plate 21, and the guide cylinder 72 is installed above the guide mounting plate 71. The central axes of the guide cylinder 72, the first sleeve assembly 13 and the second sleeve assembly 14 are on the same plane. The guide cylinder 72 can be fixedly installed on the guide mounting plate 71 by bolts, and the central axes of the guide cylinder 72, the first sleeve assembly 13 and the second sleeve assembly 14 are on the same plane, so that the guide module 7 and the positioning module 1 form a relative positioning, and the distance between the central axis of the guide cylinder 72 and the central axis of the first sleeve assembly 13 is preferably 420mm. The guide cylinder 72 can be connected to the fuel assembly accordingly to provide a guiding effect for the initial positioning of the fuel assembly by the positioning module 1. When the guide cylinder 72 is installed, the fuel assembly can pass through the guide cylinder 72 in the axial direction.

[0085] Further, the first guide roller 73, the second guide roller 74 and the third guide roller 75 are all installed below the guide mounting plate 71, the first guide roller 73 and the second guide roller 74 are vertically arranged, the second guide roller 74 and the third guide roller 75 are vertically arranged, the first guide roller 73 and the third guide roller 75 are parallelly arranged, a first roller guide block 76 is arranged on the end of the first guide roller 73, and a second roller guide block 77 is arranged on the end of the third guide roller 75. The first guide roller 73, the second guide roller 74 and the third guide roller 75 can be arranged in close contact with the relevant parts of the fuel assembly, and the three guide rollers form an opening, which is between the first roller guide block 76 and the second roller guide block 77. During the docking process, the fuel assembly can enter from the opening, so that the guide rollers fit with the relevant parts on the fuel assembly, so that the guide rollers can roll on the fuel assembly.

[0086] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the scope covered by the claims of the present invention.

Claims

1. A multifunctional detection device for a fuel assembly, characterized in that: It comprises a positioning module (1), an X-axis moving module (2), a Y-axis moving module (3), a grid width measuring module (4), a grid oxide film measuring module (5) and a fuel rod oxide film measuring module (6); The X-axis moving module (2) is connected to the positioning module (1) and can move along the X-axis direction of the fuel assembly; The Y-axis moving module (3) is connected to the X-axis moving module (2) and can move along the Y-axis direction of the fuel assembly; The grid width measuring module (4) is connected to the Y-axis moving module (3) and is used to measure the width of the grid of the fuel assembly; The grid oxide film measuring module (5) is connected to the Y-axis moving module (3) and is used to measure the oxide film thickness of the grid of the fuel assembly; The fuel rod oxide film measuring module (6) is connected to the Y-axis moving module (3) and is used to measure the oxide film thickness of the fuel rods of the fuel assembly.

2. The multifunctional detection device for fuel assembly according to claim 1, characterized in that: The positioning module (1) comprises a positioning frame (11), a lifting tool (12), a first sleeve assembly (13) and a second sleeve assembly (14); The lifting tool (12) is fixedly installed above the positioning frame (11), and the first sleeve assembly (13) and the second sleeve assembly (14) are separately fixedly installed below the positioning frame (11), and the center distance between the first sleeve assembly (13) and the second sleeve assembly (14) is 800 mm to 900 mm; The positioning frame (11) is also provided with a level (15).

3. The multifunctional detection device for fuel assembly according to claim 2, characterized in that: The X-axis moving module (2) comprises an X-axis positioning plate (21) fixedly connected to the positioning frame (11), an X-axis guide rail (22) fixedly connected to the X-axis positioning plate (21), an X-axis slider (23) movably connected to the X-axis guide rail (22), an X-axis moving plate (24) fixedly connected to the X-axis slider (23), and an X-axis driving motor (25) mounted on the X-axis positioning plate (21) and used for driving the X-axis moving plate (24) to move.

4. The multifunctional detection device for fuel assembly according to claim 3, characterized in that: The Y-axis moving module (3) comprises a Y-axis guide rail (31) fixedly connected to the X-axis moving plate (24), a Y-axis slider (32) movably connected to the Y-axis guide rail (31), a Y-axis moving plate (33) fixedly connected to the Y-axis slider (32), and a Y-axis driving motor (34) mounted on the X-axis moving plate (24) and used for driving the Y-axis moving plate (33) to move.

5. The multifunctional detection device for fuel assembly according to claim 4, characterized in that: The grid width measuring module (4) comprises a width measuring positioning plate (401) fixedly connected to the Y-axis moving plate (33), a width measuring adjustment seat (402) fixedly connected to the width measuring positioning plate (401), a width measuring guide shaft (403) fixedly connected to the width measuring adjustment seat (402), a width measuring connecting piece (404) movably connected to the width measuring guide shaft (403) and movable on the width measuring adjustment seat (402), and a width measuring adjustment rod (405) drivingly connected to the width measuring connecting piece (404), wherein the width measuring adjustment rod (405) is used to adjust the position of the width measuring connecting piece (404) relative to the width measuring adjustment seat (402).

6. The multifunctional detection device for fuel assembly according to claim 5, characterized in that: The grid width measurement module (4) further comprises a width measurement mounting frame (406), a width measurement driver (407), a width measurement limiting frame (408), a width measurement positioning shaft (409) and a width measurement supporting frame (410); The width measurement mounting frame (406) is fixedly connected to the width measurement connecting piece (404), the width measurement driver (407) is mounted on the width measurement mounting frame (406) and the output end of the width measurement driver (407) is connected to the width measurement limiting frame (408), the width measurement positioning shaft (409) is fixedly connected to the width measurement limiting frame (408), and the width measurement supporting frame (410) is movably connected to the width measurement positioning shaft (409).

7. The multifunctional detection device for fuel assembly according to claim 6, characterized in that: The grid width measurement module (4) further comprises a width measurement center block (411), a first measurement clamping jaw mounting block (412), a second measurement clamping jaw mounting block (413), a first plane clamping jaw portion (414), a second plane clamping jaw portion (415), a first inclined clamping jaw portion (416) and a second inclined clamping jaw portion (417), a first measurement limit axis (418) and a second measurement limit axis (419); The width measurement center block (411) is movably connected to the width measurement positioning shaft (409), the two ends of the first measurement limit shaft (418) are respectively connected to the width measurement center block (411) and the width measurement support frame (410), and the two ends of the second measurement limit shaft (419) are respectively connected to the width measurement center block (411) and the width measurement support frame (410); The first measuring clamping jaw mounting block (412) is movably connected to the first measuring limit axis (418), and the second measuring clamping jaw mounting block (413) is movably connected to the second measuring limit axis (419); The first planar clamping jaw portion (414) is fixedly connected to the first measuring clamping jaw mounting block (412), the first inclined clamping jaw portion (416) is fixedly connected to the first planar clamping jaw portion (414) and is inclinedly arranged with respect to the first planar clamping jaw portion (414), and the second inclined clamping jaw portion (417) is fixedly connected to the second planar clamping jaw portion (415) and is inclinedly arranged with respect to the second planar clamping jaw portion (415).

8. The multifunctional detection device for fuel assembly according to claim 7, characterized in that: The grid width measurement module (4) further comprises a width measurement sensor (420), a width measurement inductor (421), a sensor connection frame (422), a temperature sensor (423) and a width measurement limit switch (424); The width measurement sensor (420) is fixedly connected to the second measuring clamp mounting block (413), the width measurement sensor (421) is fixedly connected to the first measuring clamp mounting block (412), the sensor connecting frame (422) is fixedly connected to the width measurement limit frame (408), and the temperature sensor (423) and the width measurement limit switch (424) are both mounted on the width measurement limit frame (408).

9. The multifunctional detection device for fuel assembly according to claim 8, characterized in that: A first measuring tension spring (425) is connected between the first measuring clamping jaw mounting block (412) and the width measuring support frame (410), and a second measuring tension spring (426) is connected between the second measuring clamping jaw mounting block (413) and the width measuring support frame (410); Measuring rollers (427) are installed on the first measuring jaw mounting block (412), the second measuring jaw mounting block (413), the first plane jaw portion (414) and the second plane jaw portion (415).

10. The multifunctional detection device for fuel assembly according to claim 4, characterized in that: The grid oxide film measurement module (5) comprises an oxide film measurement positioning plate (501) fixedly connected to the Y-axis moving plate (33), an oxide film measurement mounting frame (502) fixedly connected to the oxide film measurement positioning plate (501), an oxide film measurement guide rail (503) fixedly connected to the oxide film measurement mounting frame (502), an oxide film measurement slider (504) movably connected to the oxide film measurement guide rail (503), an oxide film measurement moving plate (505) fixedly connected to the oxide film measurement slider (504), and an oxide film measurement driving motor (506) mounted on the oxide film measurement mounting frame (502) and used for driving the oxide film measurement moving plate (505) to move.

11. The multifunctional detection device for fuel assembly according to claim 10, characterized in that: The grid oxide film measurement module (5) further comprises an oxide film measurement calibration connection block (507) fixedly connected to the oxide film measurement mounting frame (502) and an oxide film measurement calibration block (508) fixedly connected to the oxide film measurement calibration connection block (507).

12. The multifunctional detection device for fuel assembly according to claim 11, characterized in that: The grid oxide film measurement module (5) further comprises an oxide film measurement limiting frame (509), a first oxide film measurement guide frame (510), a second oxide film measurement guide frame (511), a first grid oxide film measurement probe (512) and a second grid oxide film measurement probe (513); The oxide film measurement limiting frame (509) is fixedly connected to the oxide film measurement movable plate (505); a limiting groove (514) is provided on the oxide film measurement limiting frame (509); the first oxide film measurement guide frame (510) and the second oxide film measurement guide frame (511) are both installed on the limiting groove (514); the first grid oxide film measurement probe (512) is installed on the first oxide film measurement guide frame (510); the second grid oxide film measurement probe (513) is installed on the second oxide film measurement guide frame (511); and the oxide film measurement calibration block (508) is located between the first oxide film measurement guide frame (510) and the second oxide film measurement guide frame (511).

13. The multifunctional detection device for fuel assembly according to claim 4, characterized in that: The fuel rod oxide film measurement module (6) comprises a fuel rod measurement positioning plate (601) fixedly connected to the Y-axis moving plate (33), a fuel rod measurement adjustment seat (602) fixedly connected to the fuel rod measurement positioning plate (601), a fuel rod measurement guide shaft (603) fixedly connected to the fuel rod measurement adjustment seat (602), a fuel rod measurement connecting piece (604) movably connected to the fuel rod measurement guide shaft (603) and movable on the fuel rod measurement adjustment seat (602), and a fuel rod measurement adjustment rod (605) drivingly connected to the fuel rod measurement connecting piece (604), wherein the fuel rod measurement adjustment rod (605) is used to adjust the position of the fuel rod measurement connecting piece (604) relative to the fuel rod measurement adjustment seat (602).

14. The multifunctional detection device for fuel assembly according to claim 13, characterized in that: The fuel rod oxide film measurement module (6) also includes a probe frame support (606), a locking wrench seat (607), a locking handle (608), a locking positioning shaft (609) and an adjustable stop member (625); The probe frame support (606) is fixedly connected to the fuel rod measurement connector (604), and a handle receiving groove (610) for receiving the locking handle (608) is provided on the probe frame support (606); The locking wrench seat (607) is installed on the probe frame support (606), and the locking positioning shaft (609) is connected to the locking wrench seat (607) and the probe frame support (606); The locking handle (608) is rotatably connected to the locking positioning shaft (609), a handle locking pin (611) is provided on the locking handle (608), one end of the locking handle (608) close to the locking positioning shaft (609) has a handle arc portion (6091), and the locking wrench seat (607) is provided with a handle locking hole (612) corresponding to the handle locking pin (611); The adjustable stop member (625) is mounted on the locking wrench seat (607) and abuts against the handle arc portion (6091).

15. The multifunctional detection device for fuel assembly according to claim 14, characterized in that: The fuel rod oxide film measurement module (6) also includes a probe limit fixing block (613), a fuel rod oxide film measurement probe (614), a fuel rod calibration mounting frame (615), a plurality of fuel rod measurement calibration blocks (616) and a fuel rod calibration support frame (617); The probe position limiting and fixing block (613) is fixedly connected to the locking wrench seat (607), and the probe position limiting and fixing block (613) and the locking wrench seat (607) are used together to position and fix the fuel rod oxide film measuring probe (614); The fuel rod calibration mounting frame (615) is fixedly connected to the fuel rod calibration support frame (617); one end of the fuel rod oxide film measurement probe (614) away from the locking wrench seat (607) is positioned on the fuel rod calibration mounting frame (615); a plurality of fuel rod measurement calibration blocks (616) are mounted on the fuel rod calibration mounting frame (615); and the fuel rod oxide film measurement probe (614) and the plurality of fuel rod measurement calibration blocks (616) are arranged correspondingly.

16. The multifunctional detection device for fuel assembly according to claim 15, characterized in that: The fuel rod oxide film measurement module (6) also includes a camera mounting slide bar (618), a camera mounting frame (619), a lighting mounting frame (620), a camera (621) and a lighting lamp (622); The camera mounting slide bar (618) is fixedly connected to the fuel rod calibration mounting frame (615), the camera mounting frame (619) and the lighting mounting frame (620) are both mounted on the camera mounting slide bar (618), the camera (621) is fixedly connected to the camera mounting frame (619), and the lighting lamp (622) is fixedly connected to the lighting mounting frame (620).

17. The multifunctional detection device for fuel assembly according to claim 3, characterized in that: The multifunctional detection device further comprises a guide module (7), wherein the guide module (7) comprises a guide mounting plate (71), a guide cylinder (72), a first guide roller (73), a second guide roller (74) and a third guide roller (75); The guide mounting plate (71) is fixedly connected to the X-axis positioning plate (21), the guide cylinder (72) is installed above the guide mounting plate (71), and the central axes of the guide cylinder (72), the first sleeve assembly (13) and the second sleeve assembly (14) are on the same plane; The first guide roller (73), the second guide roller (74) and the third guide roller (75) are all installed below the guide mounting plate (71).

18. The multifunctional detection device for fuel assembly according to claim 17, characterized in that: The first guide roller (73) and the second guide roller (74) are arranged perpendicularly, the second guide roller (74) and the third guide roller (75) are arranged perpendicularly, and the first guide roller (73) and the third guide roller (75) are arranged in parallel; A first roller guide block (76) is provided on the end of the first guide roller (73), and a second roller guide block (77) is provided on the end of the third guide roller (75).

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