Holding device for flaky fuel pellet samples and sampling system

Abstract

The embodiments of the present application relate to the technical field of sampling fuel pellets, specifically a holding device and a sampling system for sheet fuel pellet samples. The holding device may include a sampling holding body, a hollow pressing member, and a locking assembly. The sampling holding body forms a holding groove and a sampling groove connected to the holding groove below the holding groove. The hollow pressing member is used to press the sheet fuel pellet sample in the holding groove, so that the sampling assembly can sample the sheet fuel pellet sample through the hollow pressing member, and the sample obtained can fall into the sampling groove through the hollow pressing member. The locking assembly is used to lock the hollow pressing member in the holding groove and apply pressure to the hollow pressing member and the sheet fuel pellet sample to prevent the sheet fuel pellet sample from moving relative to the sampling holding body during the sampling process of the sampling assembly. The holding device of the embodiment of the present application can prevent the original fragments of the sheet fuel pellet sample from loosening, falling, and vibrating and displacing during the sampling process.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of fuel pellet sampling, and in particular to a holding device for sheet-shaped fuel pellet samples and a sampling system. Background Art

[0002] The content in this section only provides background information related to this application and does not necessarily constitute prior art.

[0003] During nuclear power plant operation, fuel pellets are significantly affected by radial variations in temperature, neutron flux, and fuel. Therefore, both sampling location and sample size significantly impact microstructural analysis. To study fuel pellet performance, it is necessary to remove small samples (e.g., with a diameter of less than 1 mm) from the fuel pellets. Currently, this process presents numerous challenges, impacting the accuracy of fuel pellet analysis and testing results. Summary of the Invention

[0004] A brief overview of the present application is provided below to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify key or important portions of the present application, nor is it intended to limit the scope of the present application. Its purpose is simply to present certain concepts in a simplified form as a prelude to the more detailed description that will be discussed later.

[0005] To solve the above technical problems, embodiments of the present application provide a device for holding a sheet-like fuel pellet sample and a sampling system.

[0006] In a first aspect, an embodiment of the present application provides a device for holding a flaky fuel pellet sample. The device is used to hold the flaky fuel pellet sample and allow a sampling assembly to obtain a sample from the flaky fuel pellet sample. The device may include a sampling holding body, a hollow pressing member, and a locking assembly. The sampling holding body forms a holding groove and a sampling groove below the holding groove and connected to the holding groove. The hollow pressing member is used to compress the flaky fuel pellet sample within the holding groove, so that the sampling assembly can obtain a sample from the flaky fuel pellet sample through the hollow pressing member, and the obtained sample can fall into the sampling groove through the hollow pressing member. The locking assembly is used to lock the hollow pressing member in the holding groove and apply pressure to the hollow pressing member and the flaky fuel pellet sample to prevent the flaky fuel pellet sample from moving relative to the sampling holding body during sampling by the sampling assembly.

[0007] The holding device of the embodiment of the present application compresses and fixes the flaky fuel pellet sample through a hollow pressing piece and a locking assembly, which can prevent the flaky fuel pellet sample from moving during the sampling process. At the same time, the hollow pressing piece can compact the surface of the flaky fuel pellet sample, preventing the original fragments of the flaky fuel pellet sample from loosening, falling and vibrating and displacing during the sampling process, thereby facilitating the sampling assembly to more accurately remove tiny samples from different positions of the flaky fuel pellet sample.

[0008] In a second aspect, embodiments of the present application further provide a sampling system for flaky fuel pellet samples, which is used to obtain samples from flaky fuel pellet samples prepared after irradiation. The sampling system may include a sampling platform, the retaining device provided in the first aspect of the present application, a sample collection member, a sampling assembly, and a movable member. The retaining device is disposed on the sampling platform and is used to retain the flaky fuel pellet sample. The sample collection member is disposed in a sampling trough and is used to collect samples that fall from the retaining device. The sampling assembly is used to obtain samples from the flaky fuel pellet sample. The movable member is configured to be movable relative to the sampling platform to drive the sampling assembly to the retaining device for sampling.

[0009] These and other advantages of the present application will become more apparent through the following detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] To further illustrate the above and other advantages and features of the present application, the following detailed description of specific embodiments of the present application is provided in conjunction with the accompanying drawings. The accompanying drawings, together with the detailed description below, are incorporated into and form a part of this specification. Elements with the same function and structure are denoted by the same reference numerals. It should be understood that these drawings depict only typical examples of the present application and should not be construed as limiting the scope of the present application.

[0011] Figure 1 A schematic diagram showing the structure of a holding device for a flaky fuel pellet sample according to one embodiment of the present application after holding the flaky fuel pellet;

[0012] Figure 2 Shown Figure 1 A partially exploded schematic diagram of the holding device of the flaky fuel pellet sample shown after holding the flaky fuel pellet;

[0013] Figure 3 1 is a schematic structural diagram of a sampling system for flaky fuel pellet samples according to one embodiment of the present application;

[0014] Figure 4 It is a structural schematic diagram of a crushing device according to an embodiment of the present application.

[0015] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

[0016] Description of reference numerals:

[0017] 10. Holding device;

[0018] 11. Sampling holding body; 101. Holding slot; 102. Sampling slot; 103. First clearance slot; 104. Second clearance slot; 111. Mounting seat; 112. Locking connector;

[0019] 12. Hollow pressing member; 121. First pressing plate; 1211. First through hole; 122. Second pressing plate; 1221. Second through hole; 123. First gripping portion; 124. Second gripping portion;

[0020] 13. Locking assembly; 131. Gland; 1311. Cover through hole; 1312. Notch; 132. Locking fitting; 133. Locking member;

[0021] 20. Sampling platform;

[0022] 30. Sample collecting part; 301. Collecting tank; 31. Collecting body; 32. Collecting grip; 33. Limiting part;

[0023] 40. Sampling assembly; 41. Drill bit; 42. Drill bit drive unit; 43. Dust collector; 44. Impact member; 441. Impact rod; 442. Impact connecting rod; 443. Impact grip; 45. Horizontal impact stopper;

[0024] 50. Moving part; 51. X-axis motion module; 52. Y-axis motion module; 53. Z-axis motion module;

[0025] 60. Crushing device; 61. Crushing body; 611. Crushing space; 62. Crushing parts; 63. Crushing connecting rod; 64. Crushing grip;

[0026] 71. First image acquisition component; 72. Second image acquisition component;

[0027] 80. Locking sleeve;

[0028] 90. Flaky fuel pellet sample; 91. Fuel pellet; 92. Epoxy resin. DETAILED DESCRIPTION

[0029] Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. For the sake of clarity and conciseness, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary depending on the implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is a routine task for those skilled in the art who benefit from the content of this application.

[0030] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, the accompanying drawings only show the device structure and / or processing steps that are closely related to the solution according to the present application, while other details that are not closely related to the present application are omitted.

[0031] It should be noted that, unless otherwise defined, the technical or scientific terms used in this application should have the common meanings understood by persons having ordinary skills in the field to which this application belongs.

[0032] In the description of the embodiments of the present application, “multiple” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In related technologies, to prevent fuel pellets from falling off during the cutting and polishing process of spent fuel rods, epoxy resin is filled around the spent fuel rods using resin casting technology to secure the spent fuel rods. Subsequently, the spent fuel rods filled with epoxy resin are cut into sheet-like fuel pellet samples at locations where sampling and testing are required, thereby obtaining test specimens from the sheet-like fuel pellet samples.

[0034] The inventors of the present application have discovered that due to the high hardness of ceramic fuel pellets and the large radial temperature gradient, the fuel pellets break up after irradiation. During the sampling process of flaky fuel pellets, the original fragments of these fuel pellets are prone to loosening, falling, and vibrating and displacing, thereby affecting the accuracy of the fuel pellet analysis and test results.

[0035] To solve the above technical problems, an embodiment of the present application provides a device for holding a flaky fuel pellet sample, which is used to hold the flaky fuel pellet sample and allow a sampling assembly to obtain a sample from the flaky fuel pellet sample.

[0036] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram showing the structure of a holding device for a flaky fuel pellet sample according to one embodiment of the present application after holding the flaky fuel pellet; Figure 2Shown Figure 1 A partially exploded schematic diagram of a holding device for a flaky fuel pellet sample is shown after holding the flaky fuel pellet. The holding device 10 of an embodiment of the present application may include a sampling holding body 11, a hollow pressing member 12, and a locking assembly 13. The sampling holding body 11 defines a holding slot 101 and a sampling slot 102 below and connected to the holding slot 101. The hollow pressing member 12 is used to compress the flaky fuel pellet sample 90 within the holding slot 101, enabling the sampling assembly 40 to obtain a sample from the flaky fuel pellet sample 90 through the hollow pressing member 12 and allowing the obtained sample to drop through the hollow pressing member 12 into the sampling slot 102. The locking assembly 13 is used to lock the hollow pressing member 12 in the holding slot 101 and apply pressure to the hollow pressing member 12 and the flaky fuel pellet sample 90 to prevent the flaky fuel pellet sample 90 from moving relative to the sampling holding body 11 during sampling by the sampling assembly 40.

[0037] The holding device 10 of the embodiment of the present application compresses and fixes the flaky fuel pellet sample 90 through the hollow pressing piece 12 and the locking assembly 13, which can prevent the flaky fuel pellet sample 90 from moving and causing the sample to break during the sampling process. At the same time, the hollow pressing piece 12 can compact the surface of the flaky fuel pellet sample 90 to prevent the original fragments of the flaky fuel pellet sample 90 from loosening, falling and vibrating and displacing during the sampling process, thereby facilitating the sampling assembly to more accurately remove tiny samples from different positions of the flaky fuel pellet sample 90.

[0038] In some embodiments, the sheet-shaped fuel pellet sample 90 may include a fuel pellet 91 and an epoxy resin 92 disposed radially outside the fuel pellet 91 .

[0039] In some embodiments, the hollow pressing member 12 may include a first pressing plate 121 and a second pressing plate 122. The first pressing plate 121 and the second pressing plate 122 are used to clamp the flaked fuel pellet sample 90 therein. The first pressing plate 121 is provided with a plurality of first through holes 1211, and the second pressing plate 122 is provided with a plurality of second through holes 1221. This allows the sampling assembly 40 to obtain a sample from the flaked fuel pellet sample 90 through the first through holes 1211 of the first pressing plate 121, and allows the obtained sample to fall into the sampling slot 102 through the second through holes 1221 of the second pressing plate 122. Furthermore, the first pressing plate 121 and the second pressing plate 122 can be used to compress the flaked fuel pellet sample 90. With this arrangement, the radial position of the surface of the sheet-like fuel core sample 90 can be observed through the first through hole 1211, so that the sample can be accurately positioned and drilled. At the same time, the obtained sample can drop directly into the sampling groove 102 through the second through hole 1221, which can prevent the sample from falling into an area outside the sampling groove 102, thereby improving the sample collection rate.

[0040] In some embodiments, the first through hole 1211 and the second through hole 1221 have the same size and are aligned one to one. In some embodiments, the diameter of the first through hole 1211 is 0.5-3 mm.

[0041] In some embodiments, the first pressing plate 121 and the second pressing plate 122 are mesh-like structures. The two hollow pressing plates simultaneously perform mesh compaction on the flaked fuel pellet sample 90 from both the top and bottom sides, which facilitates more uniform pressure on the flaked fuel pellet sample 90 and reduces the risk of damage to the flaked fuel pellet sample 90 due to excessive local pressure.

[0042] In some embodiments, the bottom wall of the retaining groove 101 forms a retaining through-hole, and the second pressing plate 122 is disposed within the retaining groove 101 and supported by the bottom wall surrounding the retaining through-hole. The collected sample can sequentially pass through the second through-hole 1221 of the second pressing plate 122 and the retaining through-hole and fall into the sampling groove 102, thereby preventing the collected sample from falling outside the sampling groove 102 and improving the sample collection rate. Furthermore, the second pressing plate 122 is disposed within the retaining groove 101 and supported by the bottom wall surrounding the retaining through-hole, ensuring its stability during the sampling process.

[0043] In some embodiments, the projection contours of each first through hole 1211 of the first pressing plate 121 and each second through hole 1221 of the second pressing plate 122 in the horizontal plane are located inside the projection contours of the retaining through holes formed by the bottom wall of the retaining groove 101 in the same horizontal plane.

[0044] In some embodiments, the hollow pressing member 12 may further include a first gripping portion 123 and a second gripping portion 124. The first gripping portion 123 and the second gripping portion 124 are respectively connected to the first pressure plate 121 and the second pressure plate 122 for being gripped by a manipulator. The sampling holding body 11 also forms a first clearance groove 103 and a second clearance groove 104 that are connected to the holding groove 101. The first clearance groove 103 and the second clearance groove 104 extend along different radial directions of the holding groove 101, and are respectively used to allow the first gripping portion 123 and the second gripping portion 124 to pass through. In this embodiment, by providing the first gripping portion 123 and the second gripping portion 124, and making the first clearance groove 103 and the second clearance groove 104 extend along different radial directions of the holding groove 101, it is convenient for a manipulator to grip for disassembly and assembly, thereby preventing the operator from being contaminated by radioactivity or being irradiated by excessive doses.

[0045] In some embodiments, the locking assembly 13 may include a pressure cap 131 pivotally connected to the sampling and holding body 11, a locking member 132 disposed on the sampling and holding body 11, and a locking member 133 for locking the pressure cap 131 with the locking member 132. The pressure cap 131 is used to press the first pressure plate 121 downward. A cover through-hole 1311 is formed in the center of the pressure cap 131. The sampling assembly 40 can sequentially sample the flaky fuel pellet sample 90 through the cover through-hole 1311 and the first through-hole 1211 of the first pressure plate 121. In this embodiment, the compression of the pressure cap 131 ensures the stability of the first pressure plate 121, the flaky fuel pellet sample 90, and the second pressure plate 122 during the sampling process, thereby facilitating accurate sampling. Furthermore, utilizing the cover through-hole 1311 and the first through-hole 1211, the sampling assembly can precisely sample different locations of the flaky fuel pellet sample 90.

[0046] In some embodiments, the gland 131 forms a notch 1312. The locking member 132 is a threaded rod that can be inserted upward through the notch 1312. The locking member 133 is a nut, which is tightened against the rod above the notch 1312 by a manipulator operating the locking sleeve 80. The locking sleeve 80 has a locking groove formed therein that matches the shape of the nut 133. The nut 133 fits into the locking groove and rotates synchronously with the locking sleeve 80, thereby ensuring that the gland 131 can press the first pressure plate 121 downward. In this embodiment, the manipulator can more easily perform locking and unlocking operations.

[0047] In some embodiments, the holding device 10 may further include a locking connector 112 for mounting a locking member 132 on the sample holding body 11. The locking member 132 may be pivotally connected to the locking connector 112 so that the locking member 132 can swing toward the notch 1312 of the gland 131, thereby allowing the locking member 132 to enter or exit the notch 1312. This arrangement facilitates the manipulation of a manipulator to complete locking and unlocking operations.

[0048] In some embodiments, the nut 133 is magnetically connected to the locking sleeve 80, thereby facilitating the manipulator to complete the locking or unlocking operation. At the same time, the magnetic connection also ensures the stability of the nut 133 during the locking process, reducing the risk of falling off.

[0049] The present invention also provides a sampling system for a flaked fuel pellet sample, which is used to obtain a sample from a flaked fuel pellet sample prepared after irradiation (hereinafter referred to as the sampling system).

[0050] See also Figure 3 , Figure 31 is a schematic diagram of the structure of a sampling system according to one embodiment of the present application. The sampling system of the embodiment of the present application may include a sampling platform 20, a holding device 10 according to any embodiment of the present application, a sample collection member 30, a sampling assembly 40, and a movable member 50. The holding device 10 is disposed on the sampling platform 20 and is used to hold a flaky fuel pellet sample 90. The sample collection member 30 is disposed in a sampling groove 102 and is used to collect samples that fall from the holding device 10. The sampling assembly 40 is used to obtain samples from the flaky fuel pellet sample 90. The movable member 50 is configured to be movable relative to the sampling platform 20 to drive the sampling assembly 40 to move to the holding device 10 for sampling.

[0051] The sampling system of the embodiment of the present application uses a holding device 10 to hold the flaky fuel pellet sample 90, preventing the flaky fuel pellet sample 90 from moving during the sampling process, preventing the original fragments of the flaky fuel pellet sample 90 from becoming loose, falling, or vibrating and displacing. Furthermore, the sampling assembly 40 is driven by the moving member 50 to move, enabling the sampling assembly 40 to obtain samples at different locations on the flaky fuel pellet sample 90, thereby accurately positioning the target sample. This reduces or avoids obtaining samples outside the preset sampling area, thereby preventing significant deviations in subsequent microstructural analysis.

[0052] In some embodiments, the sample collection piece 30 may include a collection body 31, and the collection body 31 forms a collection tank 301. The sample collection piece 30 may also include a collection holding portion 32. The collection holding portion 32 is connected to the collection body 31 and is used for operation by a manipulator, so as to facilitate the removal of the sample collection piece 30 by the manipulator, thereby preventing the operator from being contaminated by radioactivity or being irradiated by an overdose. The sample collection piece 30 may also include a limiter 33, which is provided on the collection body 31 and is used to abut against the sampling holding body 11, so as to prevent the sample collection piece 30 from being displaced or shaken during the sampling process, thereby ensuring that the sample can be effectively collected by the sample collection piece 30, thereby improving the sample collection rate.

[0053] In some embodiments, the holding device 10 may further include a magnetic component, which is arranged on the inner wall of the sampling slot 102 of the sampling holding body 11; the sample collecting piece 30 may include a magnetic fitting component arranged on the collecting body 31, so that the collection slot 301 of the sample collecting piece 30 is aligned with the holding through hole of the holding slot 101 through the magnetic fitting component and the magnetic fitting, without the need for complicated alignment operations, and quick alignment can be achieved. The magnetic connection method also enhances the stability of the connection between the sample collecting piece 30 and the holding device 10, avoiding possible dislocation or falling off during the sampling process, ensuring that the sample can be effectively collected by the sample collecting piece 30, thereby improving the sample collection rate.

[0054] In some embodiments, the sampling assembly 40 may include a drill bit 41, a drill bit drive unit 42, and a dust collector 43. The drill bit drive unit 42 is disposed on the movable member 50, and the drill bit 41 is detachably disposed on the drill bit drive unit 42 so that the drill bit 41 is driven by the drill bit drive unit 42 to drill toward the surface of the flaky fuel pellet sample 90. The dust collector 43 is disposed on the movable member 50 and is used to remove dust generated by the drill bit 41 during drilling from the surface of the flaky fuel pellet sample 90. In this embodiment, by detachably attaching the drill bit 41 to the drill bit drive unit 42, different types of drill bits 41 can be replaced according to different sampling requirements, thereby obtaining samples using the drill bit 41. By providing the dust collector 43, dust on the surface of the flaky fuel pellet sample 90 can be promptly removed, ensuring that the drilled sample is free of impurities, thereby ensuring the accuracy of subsequent microstructural analysis of the sample.

[0055] The diameter of the drill bit 41 is smaller than the diameter of the first through hole 1211 , so as to drill the surface of the sheet-like fuel pellet sample 90 through the first through hole 1211 .

[0056] In some embodiments, in order to observe the macroscopic structure of the fuel pellet using a scanning electron microscope, such as the distribution of grains, intracrystalline fission products, and fission bubbles, it is necessary to obtain a fracture specimen from the flaky fuel pellet sample 90. In related art, a drill 41 is used to grind the flaky fuel pellet sample 90 through the first through hole 1211 within a predetermined sampling area of ​​the first through hole 1211 to obtain a fracture specimen.

[0057] The inventors of the present application discovered that when a fracture specimen is obtained directly from a flaky fuel pellet sample 90 using a drill bit 41, the grinding effect of the drill bit 41 results in the presence of fine debris at the fracture surface of the fracture specimen. These fine debris cannot be sucked away by the dust collector 43 and adhere to the fracture surface, which seriously affects the observation of grains and fracture surfaces in the microstructure of the specimen.

[0058] To address the above technical issues, the drill bit in the embodiment of the present application is a solid drill bit 41, and the sampling assembly 40 may further include an impact member 44. The sampling system also includes a crushing device 60. The solid drill bit 41 is used to grind the flaky fuel pellet sample 90 to a predetermined remaining thickness within a predetermined sampling area (e.g., a specific area within a first through-hole 1211) on the surface of the flaky fuel pellet sample 90 through the hollowed-out compression member 12. The impact member 44 is operated by a robot to apply pressure to the predetermined sampling area, causing the portion remaining at the predetermined thickness to fracture, forming a micro-sample, which then falls into the sample collection member 30. The crushing device 60 is used to crush the micro-sample within the sample collection member 30 to obtain a fractured sample. In this embodiment, after grinding with the solid drill bit 41, pressure is applied by the impact member 44 to fracture the portion remaining at the predetermined thickness to form a micro-sample. The crushing device 60 then crushes the micro-sample within the sample collection member 30 to obtain a fractured sample. Since both micro-slice specimens and fracture specimens are formed in the form of fracture under the action of mechanical force, the formation of tiny debris at the fracture can be avoided, thereby effectively avoiding the influence of debris on the observation of the microstructure grains and fracture of the specimens, thereby ensuring the accuracy of subsequent microstructural analysis of the fracture specimens.

[0059] In the embodiment of the present application, milligram-level samples can be accurately taken out from different positions of the sheet-like fuel pellet sample 90 through the above-mentioned method.

[0060] See also Figure 4 , Figure 4 is a schematic diagram of the structure of a crushing device. In some embodiments, the crushing device 60 may include a crushing body 61 and a crushing assembly. The crushing body 61 forms a crushing space 611. The sample collection member 30 is disposed at the bottom of the crushing space 611. The crushing assembly is configured to move toward the sample collection member 30 and enter the collection tank 301 to crush the micro-sample in the collection tank 301, thereby forming a fracture sample to facilitate subsequent analysis of the sample's microstructure.

[0061] The crushing body 61 can be installed on the sampling platform 20 .

[0062] In some embodiments, the crushing assembly may include a crushing element 62, a crushing connecting rod 63, and a crushing grip 64. The crushing connecting rod 63 connects the crushing element 62 and the crushing grip 64. The crushing element 62 has an inner diameter smaller than the collection tank 301 and has a clearance fit with the collection tank 301. The crushing element 62 can enter the collection tank 301 and crush the fractured sample therein. The crushing connecting rod 63 is movably connected to the crushing body 61 to move the crushing element 62 toward or away from the collection tank 301. The crushing connecting rod 63 can be threadedly connected to the crushing body 61. The crushing grip 64 is configured to be rotated by a manipulator. Rotating the crushing grip 64 moves the crushing element 62 toward or away from the collection tank 301. In such an embodiment, the crushing grip 64 can be rotated by a manipulator, which facilitates controlling the force applied to the micro-slice sample and avoids over- or under-crushing the sample, which results in failure to achieve the desired crushing effect.

[0063] In some embodiments, the crushing gripping portion 64 may be a cross hand wheel to facilitate rotation by a robot.

[0064] In some embodiments, the sample collecting member 30 may be loosely fitted with the crushing space 611 to facilitate alignment of the crushing member 62 with the collecting tank 301 .

[0065] In some embodiments, the sampling assembly 40 may further include a horizontal impact stopper 45 for horizontally limiting the impact member 44. This horizontal impact stopper 45 may be provided on the drill driver 42. The drill driver 42 forms a vertically extending stopper slot. The manipulator places the impact member 44 into the stopper slot and presses it downward, forcing it to impact the surface of the fracture specimen. This arrangement effectively limits horizontal movement of the impact member 44, ensuring precise vertical impact and avoiding sampling errors caused by deviation of the impact member 44.

[0066] In some embodiments, the impact member 44 may include an impact rod 441, an impact connecting rod 442, and an impact holding portion 443. The impact connecting rod 442 is used to connect the impact rod 441 and the impact holding portion 443. The outer diameter of the impact rod 441 is smaller than the outer diameter of the impact connecting rod 442. The thinner impact rod 441 is conducive to entering the preset sampling range in the first through hole 1211, and the thicker impact connecting rod 442 is conducive to improving the strength of the reinforced impact member 44. The impact holding portion 443 is used for the robot to hold and press. When stamping is required, the limit groove of the horizontal impact limiter 45 is adjusted to a position aligned with the preset sampling area. The robot holds the impact holding portion 443 to insert the impact rod 441 into the limit groove of the horizontal impact limiter 45, and then presses down hard to break the remaining portion of the preset thickness to form a micro-sheet sample.

[0067] In some embodiments, when a cylindrical sample needs to be obtained, the drill bit 41 can be an eccentric drill bit 41. The eccentric drill bit 41 moves along a preset circumference within a preset sampling area on the surface of the flaky fuel pellet sample 90 to obtain a cylindrical sample, thereby meeting different sampling requirements and improving sampling flexibility.

[0068] In the embodiment of the present application, different forms of samples can be obtained by replacing different drill bits 41.

[0069] See also Figure 3 In some embodiments, the holding device 10 may further include a mounting base 111 for connecting to the sampling platform 20. For example, the mounting base 111 is mounted to the sampling platform 20 via fasteners, thereby ensuring a secure connection between the holding device 10 and the sampling platform 20 and preventing displacement of the holding device 10 due to vibration or external force, thereby ensuring accurate sampling.

[0070] In some embodiments, the moving member 50 may include an X-axis motion module 51, a Y-axis motion module 52, and a Z-axis motion module 53, respectively configured to move the sampling assembly 40 relative to the sampling platform 20 in a first horizontal direction, a second horizontal direction, and a vertical direction. The X-axis motion module 51 and the Y-axis motion module 52 are configured to align the drill bit 41 and the impact member 44 with a predetermined sampling area; the Z-axis motion module 53 is configured to lower the drill bit 41 to a surface proximate to the predetermined sampling area. This arrangement allows for precise positioning and complete sampling, improving sampling accuracy.

[0071] In some embodiments, the Z-axis motion module 53 is installed on the X-axis motion module 51 , the X-axis motion module 51 is installed on the Y-axis motion module 52 , and the Y-axis motion module 52 is installed on the sampling platform 20 .

[0072] In some embodiments, the drill driving unit 42 is mounted on a Z-axis motion module 53 .

[0073] In some embodiments, the sampling system may further include a first image capture component 71 and a second image capture component 72. The first image capture component 71 is disposed on the holding device 10 and is used to capture a first image of a predetermined sampling area on the surface of the flaky fuel pellet sample 90 from a first angle. The second image capture component 72 is disposed on the moving member 50 and is used to capture a second image of the predetermined sampling area on the surface of the flaky fuel pellet sample 90 from a second angle. The moving member 50 moves the sampling assembly 40 to the predetermined sampling area based on the first and second images. By arranging the first image capture component 71 on the holding device 10 and the second image capture component 72 on the moving member 50, this embodiment allows images of the predetermined sampling area on the surface of the flaky fuel pellet sample 90 to be captured from different angles. This facilitates accurate positioning of the drill bit 41 of the sampling assembly 40 and the retaining groove of the horizontal impact retaining member 45 to the predetermined sampling area based on the first and second images, thereby improving positioning accuracy.

[0074] See also Figure 3 In some embodiments, the first image acquisition component 71 can be installed on the Z-axis motion module 53, and the second image acquisition component 72 can be installed on the sampling holding body 11, which is more conducive to accurately positioning the drill bit 41 of the sampling assembly 40 and the limiting groove of the horizontal impact limiter 45 to the preset sampling area based on the first image and the second image.

[0075] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0076] The above description is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A device for holding a flaky fuel pellet sample, the device being used to hold the flaky fuel pellet sample and allowing a sampling assembly to obtain a sample from the flaky fuel pellet sample, characterized in that: The holding device comprises: a sampling holding body, the sampling holding body forming a holding groove and a sampling groove below the holding groove and communicating with the holding groove; a hollow pressing member, configured to compress the flaky fuel pellet sample in the holding groove, so that the sampling assembly can obtain a sample from the flaky fuel pellet sample through the hollow pressing member, and the obtained sample can fall into the sampling groove through the hollow pressing member; a locking assembly for locking the hollow pressing member in the holding groove and applying pressure to the hollow pressing member and the flaky fuel pellet sample to prevent the flaky fuel pellet sample from moving relative to the sampling holding body during sampling by the sampling assembly; The hollow pressing member includes: a first pressing plate and a second pressing plate, which are used to clamp the sheet-like fuel pellet sample therein; the first pressing plate is provided with a plurality of first through holes; the second pressing plate is provided with a plurality of second through holes, so that the sampling assembly can obtain a sample on the sheet-like fuel pellet sample through the first through holes of the first pressing plate, and the obtained sample can fall into the sampling groove through the second through holes of the second pressing plate.

2. The holding device according to claim 1, characterized in that The bottom wall of the retaining groove forms a retaining through hole, and the second pressing plate is arranged in the retaining groove and supported by the bottom wall of the periphery of the retaining through hole; The obtained sample can sequentially pass through the second through hole of the second pressing plate and the holding through hole and fall into the sampling groove.

3. The holding device according to claim 1, characterized in that The hollow pressing member further includes: a first holding portion and a second holding portion, respectively connected to the first pressing plate and the second pressing plate, for being held by a robot hand; The sampling holding body further forms a first make way groove and a second make way groove communicated with the holding groove. The first make way groove and the second make way groove extend along different radial directions of the holding groove and are used to allow the first holding portion and the second holding portion to pass through respectively.

4. The holding device according to claim 1, characterized in that The locking assembly includes: a pressure cover pivotally connected to the sampling holding body, a locking fitting provided on the sampling holding body, and a locking member for locking the pressure cover and the locking fitting; The pressure cover is used to press the first pressure plate downwards. A cover through-hole is formed in the middle of the pressure cover. The sampling assembly can sequentially sample the flaky fuel pellet sample through the cover through-hole and the first through-hole of the first pressure plate.

5. The holding device according to claim 4, characterized in that The gland forms a notch; The locking fitting is a rod with threads, and the rod can pass through the notch upwards; The locking member is a nut, and the manipulator operates the locking sleeve to tighten the nut onto the rod above the notch; A locking groove matching the shape of the nut is formed inside the locking sleeve, and the nut can be embedded in the locking groove and rotate synchronously with the locking sleeve.

6. The holding device according to claim 5, characterized in that The nut is magnetically connected to the locking sleeve.

7. A sampling system for a flaky fuel pellet sample, for obtaining a sample from a flaky fuel pellet sample prepared after irradiation, characterized in that: The sampling system include: Sampling platform; The holding device according to any one of claims 1 to 6, provided on the sampling platform, for holding the flaky fuel pellet sample; a sample collecting member, disposed in the sampling trough and used for collecting samples dropped from the holding device; a sampling assembly for obtaining a sample from the flaky fuel pellet sample; The moving member is configured to be movable relative to the sampling platform to drive the sampling assembly to move to the holding device for sampling.

8. The sampling system according to claim 7, characterized in that The sampling assembly comprises: a drill bit and a drill driving portion, wherein the drill driving portion is provided on the moving member, and the drill bit is detachably provided on the drill driving portion so as to be driven by the drill driving portion to drill toward the surface of the flaky fuel pellet sample; The dust collecting member is arranged on the movable member and is used for collecting dust generated when the drill bit drills away from the surface of the flaky fuel pellet sample.

9. The sampling system according to claim 8, characterized in that The drill bit is a solid drill bit, and the sampling assembly further includes an impact piece; The solid drill bit is used to grind the flaky fuel pellet sample to a remaining preset thickness in a preset sampling area on the surface of the flaky fuel pellet sample through the hollow pressing member; The impact piece is used for being operated by the manipulator to apply pressure to the preset sampling area so that the remaining portion of the preset thickness is broken to form a micro-sample that enters the sample collecting piece; The sampling system further comprises a crushing device for squeezing and crushing the micro-slice samples in the sample collecting member to obtain fracture samples.

10. The sampling system according to claim 8, characterized in that The drill bit is an eccentric drill bit, which moves along a preset circumference in a preset sampling area on the surface of the flaky fuel pellet sample to obtain a cylindrical sample.

11. The sampling system according to claim 7, characterized in that Also includes: a first image acquisition component, provided on the holding device, for acquiring a first image of a preset sampling area including the surface of the flaky fuel pellet sample from a first angle; a second image acquisition component, provided on the moving component, for acquiring a second image of a preset sampling area including the surface of the flaky fuel pellet sample from a second angle; The moving member drives the sampling component to move to the preset sampling area according to the first image and the second image.

Images