Multifunctional detection device for fuel assemblies

Abstract

The application discloses a multifunctional detection device for a fuel assembly, which comprises 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. The multifunctional detection device for the fuel assembly can complete the measurement of the grid width measuring module, the grid oxide film measuring module and the fuel rod oxide film measuring module on different positions of the fuel assembly through the setting of the X-axis moving module and the Y-axis moving module. The width of the grid of the fuel assembly is measured through the grid width measuring module, the oxide film thickness of the grid of the fuel assembly is measured through the grid oxide film measuring module, and the oxide film thickness of the fuel rod of the fuel assembly is measured through the fuel rod oxide film measuring module. Therefore, the multifunctional detection device can detect the fuel assembly from multiple positions and by multiple methods, and has important significance for guaranteeing the safe operation of the fuel assembly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel assembly poolside inspection, in particular to a multifunctional detection device for fuel assembly. BACKGROUND

[0002] The fuel assembly is subjected to high temperature, high pressure and complex chemical action of fission products, and is in a harsh working environment, which may swell, break and other failures, and even cause radioactive material leakage, resulting in serious safety accidents and social influence, so it is of great significance to detect the fuel assembly regularly. During the overhaul of nuclear power plants, the fuel assembly is transported and stored in the spent fuel pool, and is subjected to ultrasonic and eddy current comprehensive detection in the pool. In order to ensure the accuracy of the detection results and save overhaul time and personnel dose, it is necessary to design a multifunctional detection device for fuel assembly which can perform ultrasonic, eddy current and other detection processes. At present, the existing multifunctional detection device for fuel assembly has the following shortcomings and deficiencies: the current fuel assembly detection device has poor installation and positioning accuracy; different detection equipment needs to be used for different detection processes, and function integration cannot be realized; the fuel assembly cannot be fixed in relative position with the detection equipment under the conditions of fuel elevator and spent fuel pool bottom. SUMMARY

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

[0004] The technical scheme adopted by the present application to solve the technical problem is: a multifunctional detection device for fuel assembly is constructed, which comprises a positioning module, an X-axis moving module, a Y-axis moving module, a grid width measurement module, a grid oxide film measurement module and a fuel rod oxide film measurement module.

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

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

[0007] The grid width measurement module is connected with the Y-axis moving module and is used for measuring the width of the grid of the fuel assembly.

[0008] The grid oxide film measurement module is connected with the Y-axis moving module and is used for measuring the thickness of the oxide film of the grid of the fuel assembly.

[0009] The fuel rod oxide film measurement module is connected with the Y-axis moving module and is used for measuring the thickness of the oxide film of the fuel rod of the fuel assembly.

[0010] In some embodiments, the positioning module comprises a positioning rack, a hoisting tool, a first sleeve assembly, and a second sleeve assembly;

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

[0012] A level is further arranged on the positioning rack.

[0013] In some embodiments, the X-axis moving module comprises an X-axis positioning plate fixedly connected with the positioning rack, an X-axis guide rail fixedly connected with the X-axis positioning plate, an X-axis sliding block movably connected with the X-axis guide rail, an X-axis moving plate fixedly connected with the X-axis sliding block, and an X-axis driving 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 comprises a Y-axis guide rail fixedly connected with the X-axis moving plate, a Y-axis sliding block movably connected with the Y-axis guide rail, a Y-axis moving plate fixedly connected with the Y-axis sliding block, and a Y-axis driving 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 measuring module comprises a width measuring positioning plate fixedly connected with the Y-axis moving plate, a width measuring adjusting seat fixedly connected with the width measuring positioning plate, a width measuring guide shaft fixedly connected with the width measuring adjusting seat, a width measuring connecting piece movably connected with the width measuring guide shaft and movable on the width measuring adjusting seat, and a width measuring adjusting rod in transmission connection with the width measuring connecting piece, the width measuring adjusting rod being used to adjust the position of the width measuring connecting piece relative to the width measuring adjusting seat.

[0016] In some embodiments, the grid width measuring module further comprises a width measuring mounting rack, a width measuring driver, a width measuring limiting rack, a width measuring positioning shaft, and a width measuring support rack.

[0017] The width measuring mounting rack is fixedly connected with the width measuring connecting piece, the width measuring driver is installed on the width measuring mounting rack, and the output end of the width measuring driver is connected with the width measuring limiting rack, the width measuring positioning shaft is fixedly connected with the width measuring limiting rack, and the width measuring support rack is movably connected with the width measuring positioning shaft.

[0018] In some embodiments, the lattice width measurement module further comprises 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 limiting shaft and a second measurement limiting shaft;

[0019] The width measurement center block is movably connected with the width measurement positioning shaft, and two ends of the first measurement limiting shaft are respectively connected with the width measurement center block and the width measurement support frame. Two ends of the second measurement limiting shaft are respectively connected with the width measurement center block and the width measurement support frame.

[0020] The first measurement jaw mounting block is movably connected with the first measurement limiting shaft, and the second measurement jaw mounting block is movably connected with the second measurement limiting shaft.

[0021] The first planar jaw portion is fixedly connected with the first measurement jaw mounting block, the first inclined jaw portion is fixedly connected with the first planar jaw portion and is arranged obliquely with the first planar jaw portion, and the second inclined jaw portion is fixedly connected with the second planar jaw portion and is arranged obliquely with the second planar jaw portion.

[0022] In some embodiments, the lattice width measurement module further comprises a width measurement sensor, a width measurement inductor, a sensor connecting frame, a temperature sensor and a width measurement limiting switch.

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

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

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

[0026] In some embodiments, the grid oxidation film measurement module comprises an oxidation film measurement positioning plate fixedly connected with the Y-axis moving plate, an oxidation film measurement mounting frame fixedly connected with the oxidation film measurement positioning plate, an oxidation film measurement guide rail fixedly connected with the oxidation film measurement mounting frame, an oxidation film measurement sliding block movably connected with the oxidation film measurement guide rail, an oxidation film measurement moving plate fixedly connected with the oxidation film measurement sliding block, and an oxidation film measurement driving motor installed on the oxidation film measurement mounting frame and used to drive the oxidation film measurement moving plate to move.

[0027] In some embodiments, the grid oxidation film measurement module further comprises an oxidation film measurement calibration connecting block fixedly connected with the oxidation film measurement mounting frame, and an oxidation film measurement calibration block fixedly connected with the oxidation film measurement calibration connecting block.

[0028] In some embodiments, the grid oxidation film measurement module further comprises an oxidation film measurement limiting frame, a first oxidation film measurement guide frame, a second oxidation film measurement guide frame, a first grid oxidation film measurement probe, and a second grid oxidation film measurement probe.

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

[0030] In some embodiments, the fuel rod oxidation film measurement module comprises a fuel rod measurement positioning plate fixedly connected with the Y-axis moving plate, a fuel rod measurement adjusting seat fixedly connected with the fuel rod measurement positioning plate, a fuel rod measurement guide shaft fixedly connected with the fuel rod measurement adjusting seat, a fuel rod measurement connecting piece movably connected with the fuel rod measurement guide shaft and movable on the fuel rod measurement adjusting seat, and a fuel rod measurement adjusting rod in transmission connection with the fuel rod measurement connecting piece, the fuel rod measurement adjusting rod being used to adjust the position of the fuel rod measurement connecting piece relative to the fuel rod measurement adjusting seat.

[0031] In some embodiments, the fuel rod oxidation film measurement module further comprises a probe frame support, a locking wrench seat, a locking handle, a locking positioning shaft, and an adjustable stop piece.

[0032] The probe frame support is fixedly connected with the fuel rod measurement connecting piece, and the probe frame support is provided with a handle accommodating groove for accommodating the locking handle.

[0033] The locking handle is rotatably connected with the locking positioning shaft, and a handle locking pin is arranged on the locking handle.

[0034] The locking handle is rotatably connected with the locking positioning shaft, and a handle locking pin is arranged on the locking handle.

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

[0036] In some embodiments, the fuel rod oxide film measurement module further comprises a probe limiting fixing block, a fuel rod oxide film measurement probe, a fuel rod calibration mounting rack, a plurality of fuel rod measurement calibration blocks and a fuel rod calibration support rack.

[0037] The probe limiting fixing block is fixedly connected with the locking handle seat, and the probe limiting fixing block and the locking handle seat are used for positioning and fixing the fuel rod oxide film measurement probe.

[0038] The fuel rod calibration mounting rack is fixedly connected with the fuel rod calibration support rack, one end of the fuel rod oxide film measurement probe away from the locking handle seat is positioned on the fuel rod calibration mounting rack, a plurality of fuel rod measurement calibration blocks are mounted on the fuel rod calibration mounting rack, and the fuel rod oxide film measurement probe and the plurality of fuel rod measurement calibration blocks are correspondingly arranged.

[0039] In some embodiments, the fuel rod oxide film measurement module further comprises a camera installation slide rod, a camera installation rack, an illumination installation rack, a camera and an illumination lamp.

[0040] The camera installation slide rod is fixedly connected with the fuel rod calibration mounting rack, the camera installation rack and the illumination installation rack are sleeved on the camera installation slide rod, the camera is fixedly connected with the camera installation rack, and the illumination lamp is fixedly connected with the illumination installation rack.

[0041] In some embodiments, the multifunctional detection device further comprises a guide module, and the guide module comprises 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 with the X-axis positioning plate, the guide cylinder is installed 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 vertically arranged with the second guide roller, the second guide roller is vertically arranged with the third guide roller, and the first guide roller is parallelly arranged with the third guide roller.

[0045] The end of the first guide roller is provided with a first roller guide block, and the end of the third guide roller is provided with a second roller guide block.

[0046] The present application has the following beneficial effects: the multifunctional detection device for the fuel assembly 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 arrangement of the X-axis movement module and the Y-axis movement 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, so that the fuel assembly can be detected in multiple positions and multiple methods, which is of great significance to 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 and even damaged due to environmental stress. By comprehensively detecting the fuel rod and grid of the fuel assembly, the potential failure of the fuel assembly can be investigated to avoid malignant failure of the fuel assembly. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the present application, the present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

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

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

[0050] Figure 3 is the structure schematic diagram of the X-axis movement module in some embodiments of the present application;

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

[0052] Figure 5 is a first direction structural schematic diagram of a fuel rod oxide film measuring module in some embodiments of the present application;

[0053] Figure 6 is a second direction structural schematic diagram of a fuel rod oxide film measuring module in some embodiments of the present application;

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

[0055] Figure 8 is Figure 6 is an enlarged schematic diagram of A in

[0056] Figure 9 is a first direction structural schematic diagram of a grid width measuring module in some embodiments of the present application;

[0057] Figure 10 is a second direction structural schematic diagram of a grid width measuring module in some embodiments of the present application;

[0058] Figure 11 is a third direction structural schematic diagram of a grid width measuring module in some embodiments of the present application;

[0059] Figure 12 is a partial structural schematic diagram of a grid width measuring module in some embodiments of the present application;

[0060] Figure 13 is a first direction structural schematic diagram of a grid oxide film measuring module in some embodiments of the present application;

[0061] Figure 14 is a second direction structural schematic diagram of a grid oxide film measuring module in some embodiments of the present application;

[0062] Figure 15 is a structural schematic diagram of a guide module in some embodiments of the present application. DETAILED DESCRIPTION

[0063] In order to make the technical features, objectives and effects of the present application clearer, the specific embodiments of the present application will be described in detail below with reference to the drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the technical solutions, and cannot be understood as indicating that the devices or elements indicated must have a particular direction, therefore, it cannot be understood as a limitation on the present application.

[0064] It should also be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing", "setting" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "below" another element, the element can be "directly" or "indirectly" above the other element, or there can be one or more intervening elements. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features, therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly include one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

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

[0066] Understandably, the multifunctional detection device for the fuel assembly can complete the measurement of different positions of the fuel assembly by the X-axis movement module 2 and the Y-axis movement module 3, and can measure the width of the grid of the fuel assembly by the grid width measurement module 4, measure the oxide film thickness of the grid of the fuel assembly by the grid oxide film measurement module 5, and measure the oxide film thickness of the fuel rod of the fuel assembly by the fuel rod oxide film measurement module 6. The multifunctional detection device for the fuel assembly can perform multi-site and multi-method detection on the fuel assembly, 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, which may cause bending, swelling, twisting and other failures of the fuel assembly, and even damage. By comprehensively detecting the fuel rod and grid of the fuel assembly, the possible failure hidden danger of the fuel assembly can be investigated to avoid malignant failure events of the fuel assembly.

[0067] As shown in Figure 2 The positioning module 1 includes a positioning rack 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 rack 11, and can be connected with a lifting tool of a field crane. The lifting tool can be used for lifting the positioning module 1. The first sleeve assembly 13 and the second sleeve assembly 14 are separately fixedly installed below the positioning rack 11. The first sleeve assembly 13 is 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 overall positioning of the positioning module 1. The first sleeve assembly 13 and the second sleeve assembly 14 can be connected with an external positioning mechanism. The center distance between the first sleeve assembly 13 and the second sleeve assembly 14 is 800mm to 900mm, and is preferably 840mm. The positioning rack 11 is also provided with a level 15 to facilitate the operator to adjust the level of the equipment.

[0068] As shown in Figure 3As shown in the figure, the X-axis moving module 2 comprises an X-axis positioning plate 21 fixedly connected with the positioning frame 11, an X-axis guide rail 22 fixedly connected with the X-axis positioning plate 21, an X-axis sliding block 23 movably connected with the X-axis guide rail 22, an X-axis moving plate 24 fixedly connected with the X-axis sliding block 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 for moving the measuring module along the left-right direction of the fuel assembly inspection surface. The X-axis driving motor 25 is installed on the X-axis positioning plate 21 and can drive the X-axis moving plate 24 to move through a synchronous belt structure or a screw structure. The X-axis driving motor 25 can drive the measuring module to move horizontally along the left-right direction of the fuel assembly.

[0069] As shown in the figure, Figure 4 The Y-axis moving module 3 comprises a Y-axis guide rail 31 fixedly connected with the X-axis moving plate 24, a Y-axis sliding block 32 movably connected with the Y-axis guide rail 31, a Y-axis moving plate 33 fixedly connected with the Y-axis sliding block 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 for moving the measuring module along the front-back direction of the fuel assembly inspection surface. The Y-axis driving motor 34 can drive the Y-axis moving plate 33 to move through a synchronous belt structure or a screw structure. The Y-axis driving motor 34 can drive the measuring module to move horizontally along the front-back direction of the fuel assembly.

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

[0071] The lattice width measuring module 4 further comprises a width measuring mounting frame 406, a width measuring driver 407, a width measuring limiting frame 408, a width measuring positioning shaft 409 and a width measuring support frame 410. The width measuring mounting frame 406 is fixedly connected with the width measuring connecting piece 404, the width measuring driver 407 is mounted on the width measuring mounting frame 406 and the output end of the width measuring driver 407 is connected with the width measuring limiting frame 408, the width measuring positioning shaft 409 is fixedly connected with the width measuring limiting frame 408, and the width measuring support frame 410 is movably connected with the width measuring positioning shaft 409. It can be understood that the width measuring mounting frame 406 can be fixedly connected with the width measuring connecting piece 404 by bolts, the width measuring driver 407 is used to drive the width measuring limiting frame 408 to rotate, and at the same time, the width measuring support frame 410 can rotate with the width measuring limiting frame 408, so that the width measuring support frame 410 can rotate according to the different inclination degrees of the lattice, the width measuring support frame 410 is substantially rectangular and symmetrically arranged, and the width measuring support frame 410 is rotatably connected with the width measuring positioning shaft 409, and the width measuring support frame 410 can rotate within a certain range around the width measuring positioning shaft 409 according to the different shapes of the lattice.

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

[0073] Further, the first planar clamping jaw part 414 is fixedly connected with the first measuring clamping jaw mounting block 412, the first inclined clamping jaw part 416 is fixedly connected with the first planar clamping jaw part 414 and is arranged obliquely with the first planar clamping jaw part 414, and the second inclined clamping jaw part 417 is fixedly connected with the second planar clamping jaw part 415 and is arranged obliquely with the second planar clamping jaw part 415. It can be understood that the first planar clamping jaw part 414 and the second planar clamping jaw part 415 are arranged in parallel, and are used for clamping on the two side surfaces of the lattice to measure the width of the lattice, and the arrangement of the first inclined clamping jaw part 416 and the second inclined clamping jaw part 417 can make the line contact of the lattice with the inclined clamping jaw part gradually change into the surface contact with the planar clamping jaw part, so as to facilitate that the first planar clamping jaw part 414 and the second planar clamping jaw part 415 can completely fit on the two side surfaces of the lattice.

[0074] In addition, the grid width measuring module 4 further comprises a width measuring sensor 420, a width measuring inductor 421, a sensor connecting frame 422, a temperature sensor 423 and a width measuring limit switch 424. The width measuring sensor 420 is fixedly connected with the second measuring jaw mounting block 413, and the width measuring inductor 421 is fixedly connected with the first measuring jaw mounting block 412. The width measuring sensor 420 can be a displacement sensor, which can sense the change of the grid width when the distance between the first planar jaw part 414 and the second planar jaw part 415 changes with the change of the grid width, so as to measure the width of the grid. The sensor connecting frame 422 is fixedly connected with 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, and the width measuring limit switch 424 is correspondingly arranged with the measuring support frame 410. 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 jaw mounting block 412 and the width measuring support frame 410, and a second measuring tension spring 426 is connected between the second measuring jaw mounting block 413 and the width measuring support frame 410. The first measuring tension spring 425 is sleeved outside the first measuring limit shaft 418, and the second measuring tension spring 426 is sleeved outside 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, so as to ensure that the first planar jaw part 414 and the second planar jaw part 415 always keep in contact with the side surface of the grid during the width measurement of the grid. The first measuring jaw mounting block 412, the second measuring jaw mounting block 413, the first planar jaw part 414 and the second planar jaw part 415 are all installed with measuring rollers 427, which facilitate the movement of the first measuring jaw mounting block 412, the second measuring jaw mounting block 413, the first planar jaw part 414 and the second planar jaw part 415 on the grid, and reduce the friction.

[0076] As Figure 13 and Figure 14As shown, the grid oxide film measurement module 5 comprises an oxide film measurement positioning plate 501 fixedly connected with the Y-axis moving plate 33, an oxide film measurement mounting frame 502 fixedly connected with the oxide film measurement positioning plate 501, an oxide film measurement guide rail 503 fixedly connected with the oxide film measurement mounting frame 502, an oxide film measurement sliding block 504 movably connected with the oxide film measurement guide rail 503, an oxide film measurement moving plate 505 fixedly connected with the oxide film measurement sliding block 504, and an oxide film measurement driving motor 506 mounted 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 driving the oxide film measurement moving plate 505 to move along the Y-axis direction through a synchronous belt structure and a screw structure.

[0077] The grid oxide film measurement module 5 further comprises an oxide film measurement calibration connecting block 507 fixedly connected with the oxide film measurement mounting frame 502 and an oxide film measurement calibration block 508 fixedly connected with the oxide film measurement calibration connecting block 507. 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 with the oxide film measurement moving plate 505, the oxide film measurement limiting frame 509 is provided with a limiting groove 514, the first oxide film measurement guide frame 510 and the second oxide film measurement guide frame 511 are mounted on the limiting groove 514, the first grid oxide film measurement probe 512 is mounted on the first oxide film measurement guide frame 510, the second grid oxide film measurement probe 513 is mounted 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.

[0078] It can be understood that the first grid oxide film measurement probe 512 and the second grid oxide film measurement probe 513 can be an eddy current sensor, which is based on Faraday's law of electromagnetic induction and measures various parameters by detecting the eddy current in the metal conductor. When the sensor probe approaches the metal conductor, the alternating current in the probe generates an alternating magnetic field. This magnetic field induces an eddy current in the metal conductor, which in turn generates a reverse magnetic field that affects the strength of the original magnetic field. The oxide film thickness measurement utilizes the electromagnetic induction principle of eddy current, and the changing electromagnetic field acts on the conductor, generating an eddy current in the conductor. The size of the eddy current changes with the distance between the changing electromagnetic field and the conductor. The eddy current sensor is used to detect the oxide film thickness. The vertical component is selected as the measurement component during measurement. The oxide film measurement system is calibrated using the oxide film measurement calibration block 508 to establish the corresponding relationship between the vertical component of the eddy current signal and the oxide film thickness. After the reference is established, the oxide film thickness is measured. The calibration is a curve of the corresponding relationship between the vertical component of the eddy current signal and the oxide film thickness. After calibration, the oxide film measurement drive motor 506 drives 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 together to 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] As shown in Figures 5 to 8 The fuel rod oxide film measurement module 6 includes a fuel rod measurement positioning plate 601 fixedly connected with the Y-axis moving plate 33, a fuel rod measurement adjusting seat 602 fixedly connected with the fuel rod measurement positioning plate 601, a fuel rod measurement guide shaft 603 fixedly connected with the fuel rod measurement adjusting seat 602, a fuel rod measurement connecting piece 604 movably connected with the fuel rod measurement guide shaft 603 and movable on the fuel rod measurement adjusting seat 602, and a fuel rod measurement adjusting rod 605 in transmission connection with the fuel rod measurement connecting piece 604, which is used to adjust the position of the fuel rod measurement connecting piece 604 relative to the fuel rod measurement adjusting seat 602. It can be understood that the number of fuel rod measurement guide shafts 603 is two, and the fuel rod measurement connecting piece 604 is movably connected with the two fuel rod measurement guide shafts 603. The position of the fuel rod measurement connecting piece 604 relative to the fuel rod measurement adjusting seat 602 can be adjusted by adjusting the fuel rod measurement adjusting rod 605.

[0080] The fuel rod oxide film measuring module 6 further comprises 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 with the fuel rod measuring connector 604, and a handle accommodating groove 610 for accommodating the locking handle 608 is formed in 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 with the locking wrench seat 607 and the probe holder support 606. The locking handle 608 is rotationally connected with the locking positioning shaft 609, and the locking handle 608 is provided with a handle locking pin 611. An arc-shaped portion 6091 of the locking handle 608 is located close to the locking positioning shaft 609. The locking wrench seat 607 is provided with a handle locking hole 612 corresponding to the handle locking pin 611. The adjustable stopper 625 is installed on the locking wrench seat 607 and abuts against the arc-shaped portion 6091.

[0081] It can be understood that the probe holder support 606 can be fixedly connected with the fuel rod measuring connector 604 by means of bolts, and the locking positioning shaft 609 can be threadedly connected with the locking wrench seat 607, and one end of the locking positioning shaft 609 is positioned in a positioning hole of the probe holder support 606. The locking handle 608 is rotationally connected with the locking positioning shaft 609, and the locking handle 608 can rotate around the locking positioning shaft 609 between the position provided with the handle locking hole 612 and the handle accommodating groove 610. In addition, the adjustable stopper 625 can be threadedly connected with the locking wrench seat 607, and the adjustable stopper 625 abuts against the arc-shaped 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 accommodating groove 610, the arc-shaped portion 6091 abuts against the adjustable stopper 625, so that the locking handle 608 and the adjustable stopper 625 have a friction force therebetween, and at this time, 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 pulled to the position provided with the handle locking hole 612, at this time, the arc-shaped portion 6091 no longer abuts against the adjustable stopper 625, and at this time, 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 at this time, the locking wrench seat 607 and the components connected therewith can be taken out, for example, the locking wrench seat 607 and the fuel rod oxide film measuring probe 614 described below can be taken out, so that the function of quick disassembly can be realized.

[0082] The fuel rod oxide film measurement module 6 further comprises a probe limiting fixed 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 limiting fixed block 613 is fixedly connected with the locking wrench seat 607, and the probe limiting fixed 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 with the fuel rod calibration support frame 617. 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. The 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 provided 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. Understandably, the fuel rod oxide film measurement probe 614 can be an eddy current sensor. The eddy current sensor is used to detect the oxide film thickness. The vertical component is selected as the measurement component during measurement. The fuel rod measurement calibration block 616 is used to calibrate the measurement curve of the oxide film measurement system. The corresponding relationship between the eddy current signal vertical component and the oxide film thickness is established. After the reference is established, the oxide film thickness is measured. The calibration is a corresponding relationship curve between the eddy current signal vertical component and the oxide film thickness. The plurality of fuel rod measurement calibration blocks 616 can be made according to the fuel rod to be measured. After the calibration is completed, the fuel rod oxide film measurement probe 614 can be used to measure the oxide film thickness of the fuel rod.

[0083] The fuel rod oxide film measurement module 6 further comprises a camera installation slide rod 618, a camera installation frame 619, an illumination mounting frame 620, a camera 621, and an illuminating lamp 622. The camera installation slide rod 618 is fixedly connected with the fuel rod calibration mounting frame 615. The camera installation frame 619 and the illumination mounting frame 620 are both sleeved on the camera installation slide rod 618. The camera 621 is fixedly connected with the camera installation frame 619. The illuminating lamp 622 is fixedly connected with the illumination mounting frame 620. Understandably, the camera installation frame 619 and the illumination mounting frame 620 can be adjusted in height along the axial direction of the camera installation slide rod 618. The illumination mounting frame 620 is located above the camera installation frame 619. The illuminating lamp 622 can be an LED lamp. The camera 621 and the illuminating 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] As Figure 15As shown, the multifunctional detection device further comprises a guiding module 7, which comprises a guiding mounting plate 71, a guiding cylinder 72, a first guiding roller 73, a second guiding roller 74 and a third guiding roller 75. The guiding mounting plate 71 is fixedly connected with the X-axis positioning plate 21, the guiding cylinder 72 is installed above the guiding mounting plate 71, and the central axes of the guiding cylinder 72, the first sleeve assembly 13 and the second sleeve assembly 14 are in the same plane. The guiding cylinder 72 can be fixedly installed on the guiding mounting plate 71 by bolts, the central axes of the guiding cylinder 72, the first sleeve assembly 13 and the second sleeve assembly 14 are in the same plane, so that relative positioning is formed between the guiding module 7 and the positioning module 1, and the distance between the central axis of the guiding cylinder 72 and the central axis of the first sleeve assembly 13 is preferably 420 mm. The guiding cylinder 72 can be correspondingly connected to the fuel assembly, and provides a guiding effect for the initial positioning of the positioning module 1 on the fuel assembly. When the guiding cylinder 72 is installed, the fuel assembly can pass through the guiding cylinder 72 in the axial direction.

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

[0086] It can be understood that the above embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and several modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

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

2. The multifunctional inspection apparatus for fuel assemblies according to claim 1, characterized by, The positioning module (1) includes a positioning rack (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 rack (11), and the first sleeve assembly (13) and the second sleeve assembly (14) are separately fixedly installed below the positioning rack (11), and the center distance between the first sleeve assembly (13) and the second sleeve assembly (14) is 800-900 mm. The positioning rack (11) is further provided with a level (15).

3. The multifunctional inspection apparatus for fuel assemblies according to claim 2, characterized by The X-axis moving module (2) includes an X-axis positioning plate (21) fixedly connected with the positioning rack (11), an X-axis guide rail (22) fixedly connected with the X-axis positioning plate (21), an X-axis sliding block (23) movably connected with the X-axis guide rail (22), an X-axis moving plate (24) fixedly connected with the X-axis sliding block (23), and an X-axis driving motor (25) installed on the X-axis positioning plate (21) and used for driving the X-axis moving plate (24) to move.

4. The multifunctional inspection apparatus for fuel assemblies according to claim 3, characterized by The Y-axis moving module (3) includes a Y-axis guide rail (31) fixedly connected with the X-axis moving plate (24), a Y-axis sliding block (32) movably connected with the Y-axis guide rail (31), a Y-axis moving plate (33) fixedly connected with the Y-axis sliding block (32), and a Y-axis driving motor (34) installed 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 assemblies according to claim 4, characterized in that, The lattice width measuring module (4) comprises a width measuring positioning plate (401) fixedly connected with the Y-axis moving plate (33), a width measuring adjusting seat (402) fixedly connected with the width measuring positioning plate (401), a width measuring guide shaft (403) fixedly connected with the width measuring adjusting seat (402), a width measuring connecting piece (404) movably connected with the width measuring guide shaft (403) and movable on the width measuring adjusting seat (402), and a width measuring adjusting rod (405) in transmission connection with the width measuring connecting piece (404), which is used for adjusting the position of the width measuring connecting piece (404) relative to the width measuring adjusting seat (402).

6. The multifunctional detection device for fuel assemblies according to claim 5, characterized in that, The lattice width measuring module (4) further comprises a width measuring mounting rack (406), a width measuring driver (407), a width measuring limiting rack (408), a width measuring positioning shaft (409) and a width measuring support rack (410); The width measuring mounting rack (406) is fixedly connected with the width measuring connecting piece (404), the width measuring driver (407) is installed on the width measuring mounting rack (406) and the output end of the width measuring driver (407) is connected with the width measuring limiting rack (408), the width measuring positioning shaft (409) is fixedly connected with the width measuring limiting rack (408), and the width measuring support rack (410) is movably connected with the width measuring positioning shaft (409).

7. The multifunctional detection apparatus for fuel assemblies according to claim 6, characterized by The lattice width measuring module (4) further comprises a width measuring center block (411), a first measuring clamping jaw mounting block (412), a second measuring clamping jaw mounting block (413), a first planar clamping jaw part (414), a second planar clamping jaw part (415), a first inclined clamping jaw part (416) and a second inclined clamping jaw part (417), a first measuring limiting shaft (418) and a second measuring limiting shaft (419); The width measuring center block (411) is movably connected with the width measuring positioning shaft (409), both ends of the first measuring limiting shaft (418) are connected with the width measuring center block (411) and the width measuring support rack (410) respectively, and both ends of the second measuring limiting shaft (419) are connected with the width measuring center block (411) and the width measuring support rack (410) respectively; The first measuring clamping jaw mounting block (412) is movably connected with the first measuring limiting shaft (418), and the second measuring clamping jaw mounting block (413) is movably connected with the second measuring limiting shaft (419). The first plane clamping jaw part (414) is fixedly connected with the first measurement clamping jaw mounting block (412), the first inclined clamping jaw part (416) is fixedly connected with the first plane clamping jaw part (414) and is arranged obliquely with the first plane clamping jaw part (414), and the second inclined clamping jaw part (417) is fixedly connected with the second plane clamping jaw part (415) and is arranged obliquely with the second plane clamping jaw part (415).

8. The multifunctional detection device for fuel assemblies according to claim 7, characterized in that, The lattice width measurement module (4) further comprises a width measurement sensor (420), a width measurement inductor (421), a sensor connecting frame (422), a temperature sensor (423) and a width measurement limit switch (424). The width measurement sensor (420) is fixedly connected with the second measurement clamping jaw mounting block (413), the width measurement inductor (421) is fixedly connected with the first measurement clamping jaw mounting block (412), the sensor connecting frame (422) is fixedly connected with the width measurement limit frame (408), and the temperature sensor (423) and the width measurement limit switch (424) are both installed on the width measurement limit frame (408).

9. The multifunctional detection apparatus for fuel assemblies according to claim 8, characterized by, The first measurement clamping jaw mounting block (412) and the width measurement support frame (410) are connected with a first measurement tension spring (425), and the second measurement clamping jaw mounting block (413) and the width measurement support frame (410) are connected with a second measurement tension spring (426). The first measurement clamping jaw mounting block (412), the second measurement clamping jaw mounting block (413), the first plane clamping jaw part (414) and the second plane clamping jaw part (415) are all installed with measurement rollers (427).

10. The multifunctional inspection apparatus for fuel assemblies according to claim 4, characterized by The lattice oxide film measurement module (5) comprises an oxide film measurement positioning plate (501) fixedly connected with the Y-axis moving plate (33), an oxide film measurement mounting frame (502) fixedly connected with the oxide film measurement positioning plate (501), an oxide film measurement guide rail (503) fixedly connected with the oxide film measurement mounting frame (502), an oxide film measurement sliding block (504) movably connected with the oxide film measurement guide rail (503), an oxide film measurement moving plate (505) fixedly connected with the oxide film measurement sliding block (504), and an oxide film measurement driving motor (506) installed 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 apparatus for fuel assemblies according to claim 10, characterized by, The lattice oxide film measurement module (5) further comprises an oxide film measurement calibration connecting block (507) fixedly connected with the oxide film measurement mounting frame (502) and an oxide film measurement calibration block (508) fixedly connected with the oxide film measurement calibration connecting block (507).

12. The multifunctional detection device for fuel assemblies according to claim 11, characterized in that, The lattice 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 lattice oxide film measurement probe (512) and a second lattice oxide film measurement probe (513). The oxide film measurement limiting frame (509) is fixedly connected with the oxide film measurement moving plate (505), a limiting groove (514) is formed in 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 testing device for fuel assemblies 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 with the Y-axis moving plate (33), a fuel rod measurement adjusting seat (602) fixedly connected with the fuel rod measurement positioning plate (601), a fuel rod measurement guide shaft (603) fixedly connected with the fuel rod measurement adjusting seat (602), a fuel rod measurement connecting piece (604) movably connected with the fuel rod measurement guide shaft (603) and movable on the fuel rod measurement adjusting seat (602), and a fuel rod measurement adjusting rod (605) in transmission connection with the fuel rod measurement connecting piece (604), and the fuel rod measurement adjusting rod (605) is used for adjusting the position of the fuel rod measurement connecting piece (604) relative to the fuel rod measurement adjusting seat (602).

14. The multifunctional detection apparatus for fuel assemblies according to claim 13, characterized by, The fuel rod oxide film measurement module (6) further comprises a probe holder support (606), a locking wrench seat (607), a locking handle (608), a locking positioning shaft (609) and an adjustable stop piece (625). The probe holder support (606) is fixedly connected with the fuel rod measurement connecting piece (604), and a handle containing groove (610) for containing the locking handle (608) is formed in 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 with the locking wrench seat (607) and the probe holder support (606). The locking handle (608) is in rotational connection with the locking positioning shaft (609), the locking handle (608) is provided with a handle locking pin (611), one end of the locking handle (608) close to the locking positioning shaft (609) has a handle arc-shaped part (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 piece (625) is installed on the locking wrench seat (607) and abuts against the handle arc-shaped part (6091).

15. The multifunctional detection apparatus for fuel assemblies according to claim 14, characterized by, The fuel rod oxidation film measuring module (6) further comprises a probe limiting fixing block (613), a fuel rod oxidation film measuring probe (614), a fuel rod calibration mounting rack (615), a plurality of fuel rod measuring calibration blocks (616) and a fuel rod calibration support rack (617); The probe limiting fixing block (613) is fixedly connected with the locking wrench seat (607), and the probe limiting fixing block (613) and the locking wrench seat (607) are used together to position and fix the fuel rod oxidation film measuring probe (614); The fuel rod calibration mounting rack (615) is fixedly connected with the fuel rod calibration support rack (617), one end of the fuel rod oxidation film measuring probe (614) away from the locking wrench seat (607) is positioned on the fuel rod calibration mounting rack (615), a plurality of the fuel rod measuring calibration blocks (616) are mounted on the fuel rod calibration mounting rack (615), and the fuel rod oxidation film measuring probe (614) is correspondingly provided with the plurality of fuel rod measuring calibration blocks (616).

16. The multifunctional detection apparatus for fuel assemblies according to claim 15, characterized by The fuel rod oxidation film measuring module (6) further comprises a camera mounting slide rod (618), a camera mounting rack (619), an illumination mounting rack (620), a camera (621) and an illuminating lamp (622); The camera mounting slide rod (618) is fixedly connected with the fuel rod calibration mounting rack (615), the camera mounting rack (619) and the illumination mounting rack (620) are both sleeved on the camera mounting slide rod (618), the camera (621) is fixedly connected with the camera mounting rack (619), and the illuminating lamp (622) is fixedly connected with the illumination mounting rack (620).

17. The multifunctional testing device for fuel assemblies according to claim 3, characterized by The multifunctional detection device further comprises a guide module (7), and 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 with 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 apparatus for fuel assemblies according to claim 17, characterized by, 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, and the first guide roller (73) and the third guide roller (75) are arranged in parallel; A first roller guide block (76) is arranged on the end portion of the first guide roller (73), and a second roller guide block (77) is arranged on the end portion of the third guide roller (75).

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