Grillwork width measuring device of nuclear reactor fuel assembly

Abstract

The invention relates to a grillwork width measuring device for a nuclear reactor fuel assembly. The grillwork width measuring device comprises a clamping assembly and a measuring assembly, wherein the clamping assembly comprises a first clamping structure and a second clamping structure which move relatively in the first direction; the first clamping structure comprises a first clamping jaw and a first roller; the first roller is arranged in the first clamping jaw, and part of the first roller is exposed from the side, opposite to the second clamping structure, of the first clamping jaw; the second clamping structure comprises a second clamping jaw and a second roller, the second roller is arranged in the second clamping jaw, and part of the second roller is exposed from the side, opposite to the first clamping structure, of the second clamping jaw; and the measuring probe is mounted on the clamping assembly so as to measure the width of the measured grillwork when the first clamping structure and the second clamping structure clamp the measured grillwork. The device for measuring the width of the framework of the nuclear reactor fuel assembly solves the problem of measuring the width of the framework of the fuel assembly in a high-radioactivity environment, and can ensure the safety of operators and the accuracy of measurement during measurement.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant testing technology, and more particularly to a device for measuring the grid width of nuclear reactor fuel assemblies. Background Technology

[0002] After several combustion cycles, the fuel rods in a nuclear reactor undergo changes such as bending, twisting, and elongation. Because the grid restricts and fixes the fuel rods, the stress generated by the fuel rod deformation is transferred to the grid, causing it to deform as well. Currently, the amount of grid deformation is measured to calculate the internal stress at different locations on the fuel rods, providing data support for the safe operation of the nuclear reactor. However, fuel rods and the grid are usually in a highly radioactive environment, making it difficult to measure the width of the fuel assembly grid in this environment, and ensuring the safety and accuracy of such measurements is challenging. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a grid width measuring device for nuclear reactor fuel assemblies that can solve the problem of measuring the grid width of fuel assemblies in a high-radioactivity environment.

[0004] The technical solution adopted by this invention to solve its technical problem is: constructing a grid width measuring device for nuclear reactor fuel assemblies, comprising: Clamping assembly: The clamping assembly includes a first clamping structure and a second clamping structure that are relatively movable along a first direction; the first clamping structure includes a first jaw and a first roller; the first roller is disposed in the first jaw and partially exposed from the side of the first jaw opposite to the second clamping structure; the second clamping structure includes a second jaw and a second roller, the second roller being disposed in the second jaw and partially exposed from the side of the second jaw opposite to the first clamping structure; and A measuring probe is mounted on the clamping assembly to measure the width of the grid under test when the first clamping structure and the second clamping structure clamp the grid under test.

[0005] Preferably, the axial direction of the first roller is parallel to the length direction of the first gripper; And / or, the axial direction of the second roller is parallel to the length direction of the second gripper.

[0006] Preferably, the first gripper is provided with a first window, and the first window is provided corresponding to the first roller; And / or, the second gripper is provided with a second window, which is provided in correspondence with the second roller.

[0007] Preferably, the clamping assembly includes an elastic structure, which is connected to the first clamping structure and the second clamping structure.

[0008] Preferably, the clamping assembly further includes a movable guide structure, the movable guide structure including a mounting frame and a guide rod disposed on the mounting frame; The first clamping structure and the second clamping structure are movably sleeved on the guide rod.

[0009] Preferably, the mounting bracket is provided with at least one roller assembly; Each of the roller assemblies includes a third roller, the axis of which is arranged parallel to the axis of the guide rod.

[0010] Preferably, the grid width measuring device for the nuclear reactor fuel assembly further includes an adjustment mechanism; the adjustment mechanism is connected to the clamping assembly and is used to adjust the relative position of the clamping assembly and the grid being measured.

[0011] Preferably, the movable guide structure further includes a connecting bracket; the connecting bracket is fixed to one side of the mounting frame and located between the first clamping structure and the second clamping structure; the guide rod passes through the connecting bracket; The adjustment mechanism further includes a first rotating component, which includes a fixed frame and a first rotating shaft; The fixing frame is sleeved on the mounting frame and includes a first fixing part and a second fixing part; the first fixing part and the second fixing plate are respectively disposed on two opposite sides of the movable guide structure along the second direction; the second direction is perpendicular to the first direction. The first rotating shaft passes through the moving guide structure along the second direction and its two ends are respectively connected to the first fixing part and the second fixing part.

[0012] Preferably, the adjustment mechanism further includes a second rotating component, which includes a support frame and a second rotating shaft. The second rotating shaft is mounted on the support frame and rotatably connected to the fixed frame. The axial direction of the second rotating shaft is parallel to a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0013] Preferably, the adjustment mechanism further includes a guide component connected to the clamping component to guide the movement of the clamping component in the feed direction.

[0014] The grid width measuring device for nuclear reactor fuel assemblies of the present invention has the following advantages: During the feeding process, the grid to be measured can be automatically opened by a first clamping structure with a first roller and a second clamping structure with a second roller, allowing the grid to be clamped by the first jaw of the first clamping structure and the second jaw of the second clamping structure. The width of the grid is measured by a measuring probe installed on the clamping assembly, which clamps the grid in the first and second clamping structures. This solves the problem of measuring the grid width of fuel assemblies in high-radioactive environments and ensures the safety of operators and the accuracy of the measurement. The grid width measuring device for nuclear reactor fuel assemblies has the advantages of simple operation and high positioning accuracy. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the grid width measuring device for nuclear reactor fuel assembly in some embodiments of the present invention for measuring the grid under test; Figure 2 yes Figure 1 A schematic diagram of the grid width measuring device for nuclear reactor fuel assemblies; Figure 3 yes Figure 2 A partially exploded schematic diagram of the grid width measuring device for the nuclear reactor fuel assembly shown. Figure 4 yes Figure 2 A partial structural schematic diagram of the grid width measuring device for the nuclear reactor fuel assembly shown; Figure 5 yes Figure 4 A partial structural cross-sectional view of the grid width measuring device for the nuclear reactor fuel assembly shown. Figure 6 yes Figure 5 A partially exploded schematic diagram of the grid width measuring device for the nuclear reactor fuel assembly shown. Figure 7 yes Figure 6 A partial structural schematic diagram of the first clamping structure of the grid width measuring device for the nuclear reactor fuel assembly shown. Figure 8 yes Figure 6 A partial structural schematic diagram of the second clamping structure of the grid width measuring device for the nuclear reactor fuel assembly shown. Figure 9 yes Figure 3 A schematic diagram of the second rotating component of the adjustment mechanism in the grid width measuring device for the nuclear reactor fuel assembly shown. Figure 10 yes Figure 3A schematic diagram of the guide component structure of the adjustment mechanism in the grid width measuring device for nuclear reactor fuel assemblies. Detailed Implementation

[0016] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the invention will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing the technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on the present invention.

[0017] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0018] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0019] Figure 1 and Figure 2Some preferred embodiments of the grid width measuring device for nuclear reactor fuel assemblies of the present invention are shown. This grid width measuring device enables the measurement of fuel assembly grid width in a high-radioactivity environment and solves the problem of positioning the measuring device relative to the grid being measured in environments inaccessible to human intervention. This grid width measuring device ensures the safety of operators and the accuracy of measurements during operation, and has the advantages of simple operation and high positioning accuracy.

[0020] It should be noted that the grid width measuring device for the nuclear reactor fuel assembly mainly measures the deformation of the grid on the fuel assembly after the combustion cycle, and then calculates the internal stress at different locations of the fuel assembly, providing data support for the safe operation of the nuclear reactor.

[0021] like Figure 1 and Figure 2 As shown, in some embodiments, the grid width measuring device for nuclear reactor fuel assemblies may include a measuring mechanism 10 and an adjusting mechanism 20. The measuring mechanism 10, which can be used to measure the width of the grid being measured, may be mounted on the adjusting mechanism 20. The adjusting mechanism 20 can be used to adjust the relative position of the measuring mechanism 10 and the grid being measured 100. In some embodiments, the adjusting mechanism 20 allows the measuring mechanism 10 to adaptively adjust the relative position of the measuring mechanism 10 and the grid being measured 100.

[0022] like Figures 3 to 6 As shown, in some embodiments, the grid width measuring device for nuclear reactor fuel assemblies may include a clamping assembly 10a and a measuring probe 10b. The measuring probe 10b is mounted on the clamping assembly 10a, together forming a measuring mechanism 10. The measuring probe 10b can be used to measure the width of the grid 100 being measured.

[0023] In some embodiments, the clamping assembly 10a may include a first clamping structure 11 and a second clamping structure 12 that are relatively movable along a first direction. The first clamping structure 11 and the second clamping structure 12 can be opened by the grid frame 100 being measured during the feeding process of the measuring mechanism 10, and cooperate to clamp the grid frame 100 being measured when the measuring mechanism 10 is fed into position. It should be noted that the first direction may be the width direction of the grid frame.

[0024] like Figure 6 and Figure 7 As shown, in some embodiments, the first clamping structure 11 may include a first gripper 111 and a first roller 112. The first roller 112 is disposed in the first gripper 111 and partially exposed from the side of the first gripper 111 opposite to the second clamping structure 12.

[0025] In some embodiments, the first gripper 111 may be longitudinally arranged. The first gripper 111 may include a first housing 111a and a first connecting plate 111b. The first housing 111a is hollow, and the first connecting plate 111b is disposed on one side of the first housing 111a. The first connecting plate 111b is longitudinally arranged, and its length may be greater than the length of the first housing 111a.

[0026] In some embodiments, a first window 1111 is provided on the first gripper 111. The first window 1111 is opened on the side of the first housing 111a facing the second clamping structure 12 and is correspondingly provided with the first roller 112, which can be used to expose part of the first roller 112.

[0027] In some embodiments, the first housing 111a is provided with a first mounting wall 1112 for mounting the first roller 112 in the length direction. There are two first mounting walls 1112, and the two first mounting walls 1112 can be arranged at intervals along the length of the first housing 111a.

[0028] In some embodiments, the axial direction of the first roller 112 can be parallel to the length direction of the first gripper 111, that is, the axial direction of the first roller 112 can be parallel to the feed direction. This facilitates rolling contact with the grid frame 100 being measured, reduces friction, avoids damage to the grid frame 100 being measured, and allows the grid frame 100 being measured to open the first clamping structure 11 and the second clamping structure 12 when the measuring mechanism 10 is feeding. Specifically, the first roller 112 is connected to the two first mounting walls 1112 by a first connecting shaft. Part of the sidewall of the first roller 112 can be exposed from the first window 1111.

[0029] In some embodiments, the first clamping structure 11 may further include a first slider 113, which is connected to the first gripper 111 to drive the first gripper 111 to move relative to the second clamping structure 12 through sliding. Specifically, the first connecting plate 111b may be connected to the first slider 113. A first notch 1131 is provided on the side wall of the first slider 113, and the portion of the first connecting plate 111b extending beyond the first housing 111a can be inserted into the first notch 1131 and connected and fixed to the first slider 113 by a connecting assembly. In some embodiments, the connecting assembly may be a screw-in assembly. A first through hole 1132 is provided on the first slider 113, which is provided through the thickness direction of the first slider 113 for the guide rod 142 to pass through.

[0030] like Figure 5 , Figure 6 and Figure 8As shown, in some embodiments, the second clamping structure 12 may include a second gripper 121 and a second roller 122. The second roller 122 is disposed in the second gripper 121 and partially exposed from the side of the second gripper 121 opposite to the first clamping structure 11. The second gripper 121 and the first gripper 111 can cooperate with each other, and the second roller 122 and the first roller 112 are opposite to each other.

[0031] In some embodiments, the second gripper 121 may be longitudinally arranged. The second gripper 121 may include a second housing 121a and a second connecting plate 121b. The second housing 121a is hollow, and the second connecting plate 121b is disposed on one side of the second housing 121a. The second connecting plate 121b is longitudinally arranged, and its length may be greater than the length of the second housing 121a.

[0032] In some embodiments, a second window 1211 is provided on the second gripper 121. The second window 1211 is opened on the side of the second housing 121a facing the second clamping structure 12 and is correspondingly provided with the second roller 122, which can be used to expose part of the second roller 122.

[0033] In some embodiments, the second housing 121a is provided with a second mounting wall 1212 for mounting the second roller 122 in the length direction. There are two second mounting walls 1212, and the two second mounting walls 1212 can be arranged at intervals along the length of the second housing 121a.

[0034] In some embodiments, the axial direction of the second roller 122 can be parallel to the length direction of the second gripper 121, that is, the axial direction of the second roller 122 can be parallel to the feed direction. This facilitates rolling contact with the grid frame 100 being measured, reduces friction, avoids damage to the grid frame 100 being measured, and allows the grid frame 100 being measured to open the second clamping structure 12 and the first clamping structure 11 when the measuring mechanism 10 is feeding. Specifically, the second roller 122 is connected to the two first mounting walls 1112 by a first connecting shaft. Part of the sidewall of the second roller 122 can be exposed from the second window 1211.

[0035] In some embodiments, the second clamping structure 12 may further include a second slider 123, which is connected to the second gripper 121 to drive the second gripper 121 to move relative to the first clamping structure 11 through sliding. Specifically, the second connecting plate 121b may be connected to the second slider 123. A second notch 1231 is provided on the side wall of the second slider 123, and the portion of the second connecting plate 121b extending beyond the second housing 121a can be inserted into the second notch 1231 and connected and fixed to the second slider 123 by a connecting assembly. In some embodiments, the connecting assembly may be a screw-in assembly. A second through hole 1232 is provided on the second slider 123, which is provided through the second slider 123 along the thickness direction of the second slider 123 for the guide rod 142 to pass through.

[0036] For example Figures 4 to 6 As shown, in some embodiments, the clamping assembly 10a further includes an elastic structure 13, which is connected to the first clamping structure 11 and the second clamping structure 12. The elastic structure 13 enables the first clamping structure 11 and the second clamping structure 12 to adaptively move relatively closer or relatively farther apart.

[0037] In some embodiments, the elastic structure 13 may include a first fixing seat 131, a second fixing seat 132, and an elastic element 133. The first fixing seat 131 and the second fixing seat 132 may be spaced apart along the relative movement direction of the first clamping structure 11 and the second clamping structure 12, wherein the first fixing seat 131 is correspondingly disposed with respect to the first clamping structure 11 and may be connected to the first clamping structure 11. The second fixing seat 132 is correspondingly disposed with respect to the second clamping structure 12 and may be connected to the second clamping structure 12.

[0038] Specifically, in some embodiments, the first fixing base 131 may include a first connecting fixing part 1311 and an extension part 1312. The first connecting fixing part 1311 is disposed at one end of the first gripper 111 and connected to the first slider 113. The extension part 1312 is disposed on the side of the first connecting fixing part 1311 facing the second fixing base 132 and extends towards the second fixing base 132. An abutment part 1313 is provided at the end of the extension part 1312 away from the first connecting fixing part 1311. The abutment part 1313 extends to the side of the second fixing base 132 opposite to the first fixing base 131 and forms an L-shaped structure with the extension part 1312.

[0039] The second fixing base 132 may include a second connecting fixing part 1321 and a mounting part 1322. The second connecting fixing part 1321 is disposed at one end of the second gripper 121 and connected to the second slider 123. The mounting part 1322 is disposed on the side of the second connecting fixing part 1321 facing away from the second gripper 121 and protrudes from the second connecting fixing part 1321. The mounting part 1322 can be used to mount the measuring probe 10b.

[0040] In some embodiments, the elastic element 133 can be a tension spring, one end of which can be connected to the first fixing seat 131 and the other end of which can be connected to the second fixing seat 132. Specifically, the first fixing seat 131 can be provided with a first fixing post having a hanging hole, and the second fixing seat 132 can be provided with a second fixing post having a hanging hole. The two ends of the tension spring can be hung on the hanging holes of the first fixing post and the second fixing post, respectively. In some embodiments, the elastic element 133 is not limited to a tension spring and can be a spring. In some embodiments, there can be two elastic elements 133, which can be located at the upper and lower ends of the first fixing seat 131 and the second fixing seat 132, respectively. In other embodiments, there can be one or more elastic elements 133.

[0041] In some embodiments, the clamping assembly 10a further includes a movable guide structure 14, which can be used to guide the movement of the first clamping structure 11 and the second clamping structure 12. In some embodiments, the movable guide structure 14 may include a mounting bracket 141 and a guide rod 142 disposed on the mounting bracket 141. The first clamping structure 11 and the second clamping structure 12 are movably sleeved on the guide rod 142.

[0042] In some embodiments, the mounting bracket 141 may include a first mounting plate 1411 and two sets of second mounting plates 1412 disposed on opposite sides of the first mounting plate 1411. The first mounting plate 1411 may extend along the width direction of the grid 100 being measured, and the two sets of second mounting plates 1412 may be disposed opposite to each other and spaced apart. Each set of second mounting plates 1412 may include two second mounting plates 1412 disposed spaced apart in a vertical direction, and each second mounting plate 1412 may form a predetermined angle with the first mounting plate 1411, which may be a right angle. In some embodiments, each set of second mounting plates 1412 may also include one second mounting plate 1412, not limited to two. In some embodiments, there may be more than two second mounting plates 1412 in each set of second mounting plates 1412. In some embodiments, the first mounting plate 1411 is provided with a mounting protrusion 1413, which may be located between two sets of second mounting plates 1412, and there may be two mounting protrusions 1413, which may be arranged vertically at intervals.

[0043] In some embodiments, the guide rods 142 can be in two sets, with each set of guide rods 142 corresponding to a set of second mounting plates 1412. Each set of guide rods 142 may include two guide rods 142 spaced apart in the vertical direction, each guide rod 142 corresponding to a second mounting plate 1412, one end of which may be connected to the second mounting plate 1412, and the other end of which may extend along the length direction of the first mounting plate 141. In other embodiments, the guide rods 142 may not be limited to two sets, and each set of guide rods 142 may not be limited to two.

[0044] In some embodiments, the movable guide structure 14 further includes a connecting bracket 143, which can be connected and fixed to one side of the mounting bracket 141 and is located between the first clamping structure 11 and the second clamping structure 12. Specifically, the connecting bracket 143 can be installed on the side of the first mounting plate 1411 facing the grid frame 100 being measured, and it can be located between the two sets of guide rods 142. One end of the guide rod 142 away from the second mounting plate 1412 can pass through the connecting bracket 143.

[0045] In some embodiments, the connecting bracket 143 may include an annular body 1431 and wings 1432 disposed circumferentially on the annular body 1431 and extending toward each second mounting plate 1412. The annular body 1431 may be generally square in structure and has a through hole 1433 in the vertical direction. The wings 1432 may be in two sets, and each set of wings 1432 may include two wings 1432 disposed at intervals. Each wing 1432 may be provided with a fixing hole 1434, and each fixing hole 1434 may be correspondingly provided with a guide rod 142 for fixing the guide rod 142.

[0046] In some embodiments, the mounting bracket 141 is provided with at least one set of roller assemblies 144. In some embodiments, there may be two sets of roller assemblies 144, which may be installed in the gap between the two wings 1432 of each set of wings 1432. By setting the roller assemblies 144, they can make rolling contact with the grid frame 100 under test, avoiding damage to the grid frame 100 under test due to hard contact. In some embodiments, each set of roller assemblies 144 may include a mounting base 1441 and a third roller 1442. The mounting base 1441 is mounted on the first mounting plate 1411 and may be integrally formed with the first mounting plate 1411. The third roller 1442 is mounted on the mounting base 1441. In some embodiments, the axial direction of the third roller 1442 is parallel to the axial direction of the guide rod 142, that is, it may be parallel to the movement direction of the first clamping structure 11 and the second clamping structure 12.

[0047] In some embodiments, the measuring probe 10b can be mounted on the elastic structure 13. Specifically, it can be mounted on the mounting portion 1322 of the second fixing seat 132 of the elastic structure 13, and can be arranged parallel to the guide rod 142 and facing the abutment portion 1313. In some embodiments, the measuring probe 10b can be an LVDT measuring probe, that is, an LVDT displacement sensor. The measuring probe 10b can measure the displacement of the abutment portion 1313, that is, measure the relative displacement of the first clamping structure 11 and the second clamping structure 12 (also the deformation of the elastic member 133), and thus measure the width of the grid 100 under test. In some embodiments, the measuring probe 10b is not limited to being an LVDT measuring probe.

[0048] In some embodiments, the adjustment mechanism 20 may be connected to the clamping assembly 10a, and may be used to adjust the relative position of the clamping assembly 10a and the grid frame 100 being measured. In some embodiments, the adjustment mechanism 20 may include a first rotating assembly 21, which may be rotatably connected to the clamping assembly 10a so that the clamping assembly 10a can be rotated.

[0049] In some embodiments, the first rotating assembly 21 may include a fixing frame 211 and a first rotating shaft 212. The fixing frame 211 may be sleeved on the mounting frame 141. In some embodiments, the fixing frame 211 may include a connecting portion 2111, a first fixing portion 2112, and a second fixing portion 2113. The connecting portion 2111 may be longitudinally arranged in the vertical direction. The first fixing portion 2112 and the second fixing portion 2113 are disposed at both ends of the connecting portion 2111, and are both bent from the connecting portion 2111, and both extend toward the mounting frame 141. A rotating connector 213 may be installed at the middle of the connecting portion 2111. In some embodiments, the first fixing portion 2112 and the second fixing portion 2113 are respectively disposed on two opposite sides of the movable guide structure 14 arranged in a second direction, specifically, the first fixing portion 2112 and the second fixing portion 2113. It should be noted that the second direction may be perpendicular to the first direction. The first rotating shaft 212 passes through the movable guide structure 14 along the second direction. Specifically, it can pass through the connecting bracket 143 along the second direction, and its two ends are respectively connected to the first fixing part 2112 and the second fixing part 2113. Further, the first rotating shaft 212 passes through the through hole of the mounting protrusion 1413 and the connecting bracket 143, and its two ends protrude from the first fixing part 2112 and the second fixing part 2113 and are connected to the fixing frame 211, the mounting frame 141 and the connecting bracket 143 through the screw assembly, so that the clamping assembly 10a can be rotated around the first rotating shaft 212.

[0050] like Figure 3 and Figure 9As shown, in some embodiments, the adjustment mechanism 20 further includes a second rotating component 22, which can be connected to the first rotating component 21. Specifically, the second rotating component 22 can be connected to the rotating connector 213 of the first rotating component 21, and can be used to drive the first rotating component 21 and the entire measuring mechanism 10 to rotate.

[0051] In some embodiments, the second rotating assembly 22 may include a support frame 221 and a second rotating shaft 222. The second rotating shaft 222 may be mounted on the support frame 221 and connected to the fixed frame 211. The axial direction of the second rotating shaft 222 is parallel to a third direction, and the third direction is perpendicular to both the first and second directions. Specifically, it may be connected to the rotating connector 213, and then to the fixed frame 211. In some embodiments, the support frame 221 may include a support base 2211 and a base 2212. The support base 2211 may be mounted on the base 2212. The second rotating shaft 222 may be mounted on the support base 2211. In some embodiments, the second rotating assembly 22 further includes a balancing frame 223 and a rotary plunger 224. The balancing frame 223 is disposed on one side of the support frame 221. The balancing frame 223 may include a main frame 2231 and two extending protrusions 2232 disposed on two opposite sides of the main frame 2231. The main frame 2231 can be mounted on the support base 2211. Each extending protrusion 2232 may form a set angle with the main frame 2231 and extend towards the measuring mechanism 10. The two extending protrusions 2232 may be spaced apart in a direction perpendicular to the movement of the first clamping structure 11 and the second clamping structure 12. There may be two rotary plungers 224, and the two rotary plungers 224 may be corresponding one-to-one with the two extending protrusions 2232. One of the knob plungers 224 can protrude from the extension protrusion 2232 and abut against the first fixing part 2112, and the other knob plunger 224 can protrude from the other extension protrusion 2232 and abut against the second fixing part 2113.

[0052] like Figure 3 and Figure 10As shown, in some embodiments, the adjustment mechanism 20 further includes a guide component 23, which can be connected to the clamping component 10a to guide the clamping component 10a to move in the feed direction. In some embodiments, the guide component 23 may include a mounting base 231, a guide rail 232, a sliding frame 233, and a spring element 235. The mounting base 231 may be longitudinally arranged, and has a first mounting fixing part 2311 and a second mounting fixing part 2312 in the feed direction. The first mounting fixing part 2311 and the second mounting fixing part 2312 may be spaced apart along the length direction of the mounting base 231. The guide rail 232 may be disposed on the mounting base 231. Specifically, there may be two guide rails 232, which may be spaced apart along the width direction of the mounting base 231. One end of each guide rail 232 may be fixed to the first mounting fixing part 2311, and the other end may be fixed to the second mounting fixing part 2312. In some other embodiments, the guide rail 232 may not be limited to two rails; it may be one or more rails. The sliding frame 233 may be sleeved on the guide rail 232, and it may slide along the length of the guide rail 232 and be connected to the adaptive rotation mechanism 21. A connecting rod 234 may be provided between the sliding frame 233 and the second mounting and fixing part 2312. The elastic member 235 is provided between the sliding frame 233 and the first mounting and fixing part 2311. Specifically, it may be sleeved on the connecting rod 234, with one end abutting against the sliding frame 233 and the other end abutting against the second mounting and fixing part 2312.

[0053] In this embodiment, the fuel rod diameter measuring device further includes a support base 30. The support base 30 can be disposed on one side of the guide component 23 and can be connected and fixed to the guide component 23. The support base 30 can support the video monitoring component 40. In some embodiments, the support base 30 may include a first support plate 31 and a second support plate 32. The first support plate 31 can be installed on one side of the mounting base 231 of the guide component 23 and extends in a vertical direction. The second support plate 32 can be disposed at one end of the first support plate 31 and can extend in a horizontal direction to support the video monitoring component 40.

[0054] In this embodiment, the fuel rod diameter measuring device further includes a video monitoring component 40, which can be fixedly installed on the support base 30. The video monitoring component 40 can perform preliminary correction on the measuring mechanism 10, so that the measuring mechanism 10 is roughly aligned with the grid 100 being measured.

[0055] In this embodiment, the video monitoring component 40 may include a support column 41, a first set of video monitoring structures 42, a second set of video monitoring structures 43, and a supplementary lighting structure 44. The support column 41 may be mounted on a support base 30. The first set of video monitoring structures 42, the second set of video monitoring structures 43, and the supplementary lighting structure 44 may be spaced apart on the support column 41 along its axial direction. The first set of video monitoring structures 42 and the second set of video monitoring structures 43 may be used to obtain the relative position of the clamping component 10a and the grid 100 under test. In some embodiments, the video monitoring structures are not limited to two sets, but may be one set or more than two sets.

[0056] Each first set of video surveillance structures 42 may include a first bracket 421 and a first camera 422. The first bracket 421 may be fitted onto the support column 41. The first camera 422 may be mounted on the first bracket 421. The first bracket 421 is movable, thereby facilitating the adjustment of the position of the first camera 422. The first camera 422 is rotatable, and its tilt angle can be adjusted by rotation.

[0057] The second video surveillance structure 43 may include a second bracket 431 and a second camera 432. The second bracket 431 may be fitted onto the support column 41. The second camera 432 may be mounted on the second bracket 431. The second bracket 431 may be movable, thereby facilitating the adjustment of the position of the second camera 432. The second camera 432 may be rotatable, and its tilt angle may be adjusted by rotation.

[0058] In this embodiment, the supplementary lighting structure 44 may include a third bracket 441, a fixing rod 442, a light source 443, and a fourth bracket 444. The third bracket 441 may be connected to the support column 41 and may be sleeved on the support column 41. The fixing rod 442 may be disposed on the third bracket 441 and extend upward, and the light source 443 may be connected to the fixing rod 442 through the fourth bracket 444.

[0059] For example Figure 1 As shown, before measuring the fuel assembly grid width, the nuclear reactor fuel assembly grid width measuring device first uses the video monitoring component 40 to perform preliminary correction on the measuring mechanism 10, so that the measuring mechanism 10 is roughly aligned with the center of the grid 100 being measured. The measuring mechanism 10 slowly advances, and when the first clamping structure 11 and the second clamping structure 12 enter the two sides of the grid, they are passively opened. The measuring probe 10b on the measuring mechanism 10 first contacts the abutment part 1313 and is compressed. The measuring mechanism 10 continues to advance, so that the sliding frame 233 slides to the set distance position. The measuring mechanism 10 stops moving, and at this time the measuring probe 10b measures the data. The measuring mechanism 10 is then returned to the initial state, completing the measurement of the fuel assembly grid width.

[0060] To accommodate the measurement of fuel assemblies, the grid width measuring device for nuclear reactor fuel assemblies is equipped with four degrees of freedom: forward / backward movement, left / right movement, lateral rotation, and longitudinal rotation. Each degree of freedom corresponds to a relative position state of the fuel assembly, and the combined action of the four degrees of freedom can handle various relative position states of the fuel assembly.

[0061] The measuring mechanism 10 can move back and forth through the guide component 23. Specifically, the measuring mechanism 10 quickly approaches the grid frame 100 to be measured under the control of the driving system. After contacting the grid frame 100 to be measured, it passively retreats to protect the fuel assembly. When it contacts the grid frame 100 to be measured through the first clamping structure 11 and the second clamping structure 12, it can be passively opened by moving left and right.

[0062] The measuring mechanism 10 can be rotated laterally by the first rotating component 21 and longitudinally by the second rotating component 22. When the grid frame 100 being measured is slightly tilted around the vertical center, the measuring mechanism 10 will actively adapt the first clamping structure 11 and the second clamping structure 12 to the grid frame 100 being measured by the lateral and longitudinal rotation.

Claims

1. A spacer grid width measuring device for a nuclear reactor fuel assembly, characterized by, The device comprises: a clamping assembly (10a) comprising a first clamping structure (11) and a second clamping structure (12) arranged to move relative to each other along a first direction; the first clamping structure (11) comprises a first clamping jaw (111) and a first roller (112); the first roller (112) is arranged in the first clamping jaw (111) and partially exposed from a side of the first clamping jaw (111) opposite to the second clamping structure (12); the second clamping structure (12) comprises a second clamping jaw (121) and a second roller (122); the second roller (122) is arranged in the second clamping jaw (121) and partially exposed from a side of the second clamping jaw (121) opposite to the first clamping structure (11); and a measuring probe (10b) mounted on the clamping assembly (10a) to measure the width of a measured grid when the first clamping structure (11) and the second clamping structure (12) clamp the measured grid.

2. The nuclear reactor fuel assembly grid width measuring apparatus of claim 1, wherein, The axial direction of the first roller (112) is parallel to the length direction of the first clamping jaw (111); and / or, the axial direction of the second roller (122) is parallel to the length direction of the second clamping jaw (121).

3. The nuclear reactor fuel assembly grid width measuring apparatus of claim 1, wherein, The first clamping jaw (111) is provided with a first window (1111) corresponding to the first roller (112); and / or, the second clamping jaw (121) is provided with a second window (1211) corresponding to the second roller (122).

4. The nuclear reactor fuel assembly grid width measuring apparatus of claim 1, wherein, The clamping assembly (10a) comprises a resilient structure (13) connected to the first clamping structure (11) and the second clamping structure (12).

5. The nuclear reactor fuel assembly grid width measuring apparatus of claim 1, wherein, The clamping assembly (10a) further comprises a movement guide structure (14) comprising a mounting bracket (141) and a guide rod (142) arranged on the mounting bracket (141); The first clamping structure (11) and the second clamping structure (12) are movably arranged on the guide rod (142).

6. The nuclear reactor fuel assembly grid width measuring apparatus of claim 5, wherein, The mounting bracket (141) is provided with at least one roller assembly (144); Each roller assembly (144) comprises a third roller (1442) arranged in parallel to the axial direction of the guide rod (142).

7. The nuclear reactor fuel assembly grid width measuring apparatus of claim 5, wherein, The grid width measuring device of the nuclear reactor fuel assembly further comprises an adjusting mechanism (20); the adjusting mechanism (20) is connected to the clamping assembly (10a) to adjust the relative position of the clamping assembly (10a) and the measured grid.

8. The nuclear reactor fuel assembly grid width measuring apparatus of claim 7, wherein, The adjusting mechanism (20) further comprises a first rotating assembly (21) comprising a fixing bracket (211), a first rotating shaft (212); The fixing frame (211) is sleeved on the mounting frame (141) and comprises a first fixing portion (2112) and a second fixing portion (2113); the first fixing portion (2112) and the second fixing portion (2113) are respectively arranged on two opposite sides of the movement guide structure (14) along a second direction; the second direction is perpendicular to the first direction; The first rotating shaft (212) is arranged in the movement guide structure (14) along the second direction and has two ends connected with the first fixing portion (2112) and the second fixing portion (2113) respectively.

9. The nuclear reactor fuel assembly grid width measuring apparatus of claim 8, wherein, The adjusting mechanism (20) further comprises a second rotating assembly (22), the second rotating assembly (22) comprises a support frame (221) and a second rotating shaft (222), the second rotating shaft (222) is installed on the support frame (221) and is rotationally connected with the fixing frame (211); the axial direction of the second rotating shaft (222) is parallel to a third direction, the third direction is perpendicular to the first direction and the second direction.

10. The nuclear reactor fuel assembly grid width measuring apparatus of claim 7, wherein, The adjusting mechanism (20) further comprises a guide assembly (23), the guide assembly (23) is connected with the clamping assembly (10a) to guide the movement of the clamping assembly (10a) in a feeding direction.

Images