Fuel rod gap measuring device

Abstract

This invention relates to a fuel rod gap measuring device, comprising: a detection mechanism movably inserted into the gap between two adjacent fuel rods, and including a first probe and a second probe, the first probe and the second probe being relatively movable along the width direction of the gap under the action of fuel rods on both sides of the gap; and a measuring mechanism disposed on the detection mechanism, which can be configured to measure the gap width between two adjacent fuel rods based on the displacement of the first probe and the second probe. This fuel rod gap measuring device solves the problem of measuring the gap between fuel rods in a high-radioactivity environment, improving the convenience and safety of measurement, while also having the advantages of high positioning accuracy and simple operation.

Description

Technical Field

[0001] This invention relates to the field of nuclear fuel detection technology, and more particularly to a fuel rod gap measuring device. Background Technology

[0002] In related technologies, fuel rods undergo a certain degree of deformation after several combustion cycles, and deformation is one of the main factors affecting fuel rod performance. By measuring the gap between fuel rods after combustion cycles, necessary data support can be provided for evaluating the degree of fuel rod deformation during reactor operation and for the development of new fuel rods. However, fuel rods are usually in a highly radioactive environment, making it difficult to measure the gap between fuel rods manually, and it is also difficult to ensure safety during the measurement process. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a fuel rod gap measuring device that can measure the fuel rod gap in a highly radioactive environment.

[0004] The technical solution adopted by this invention to solve its technical problem is: constructing a fuel rod gap measuring device, comprising: The detection mechanism is movably inserted into the gap between two adjacent fuel rods, and includes a first probe and a second probe, which are relatively movable along the width direction of the gap under the action of the fuel rods on both sides of the gap. A measuring mechanism, disposed on the detection mechanism, is configured to measure the gap width between two adjacent fuel rods based on the displacement of the first probe and the second probe.

[0005] Preferably, the detection mechanism further includes an elastic structure, which is connected to the first probe and the second probe.

[0006] Preferably, the detection mechanism further includes a first bracket and a second bracket; the first probe is mounted on the first bracket; and the second probe is mounted on the second bracket. The elastic structure includes a first mounting base, a second mounting base, and an elastic element; the first mounting base is mounted on the first bracket, and the second mounting base is mounted on the second bracket; the elastic element is disposed between the first mounting base and the second mounting base; The measuring mechanism is mounted on the first bracket and is positioned facing the second bracket; Alternatively, the measuring mechanism may be mounted on the second bracket and oriented toward the first bracket.

[0007] Preferably, the detection mechanism further includes a limiting component, which is sleeved on the first bracket and the second bracket to limit the movement distance of the first probe and the second probe in the width direction of the gap.

[0008] Preferably, the detection mechanism further includes a movable guide structure; the movable guide structure is used to guide the first probe and the second probe to move in the gap width direction; The movable guide structure includes a mounting base and a guide rod; The mounting base includes a first mounting plate and a second mounting plate disposed opposite to the first mounting plate; the first mounting plate and the second mounting plate are spaced apart in the direction in which the first probe and the second probe move relative to each other; the guide rod is mounted on the first mounting plate and the second mounting plate, and the first bracket and the second bracket are sleeved on the guide rod and are movable along the length direction of the guide rod.

[0009] Preferably, the fuel rod gap measuring device further includes a rotating mechanism, which is connected to the detection mechanism to drive the detection mechanism to rotate.

[0010] Preferably, the rotating mechanism includes a fixed base, a rotating shaft, a bearing, and a knob; The rotating shaft is mounted on the fixed base and connected to the detection mechanism, and the knob is connected to the rotating shaft; the bearing is mounted on the fixed base and sleeved on the rotating shaft.

[0011] Preferably, the detection mechanism further includes a first adjustment component, which is disposed opposite to the first probe to adjust the position of the first probe in the gap width direction; And / or, the detection mechanism further includes a second adjustment component, which is disposed opposite to the second probe to adjust the position of the second probe in the gap width direction.

[0012] Preferably, the detection mechanism further includes a guard rod assembly, which is spaced apart from the first probe and / or the second probe and configured to fix the fuel rod on one or both sides of the gap being measured.

[0013] Preferably, the fuel rod gap measuring device further includes a video monitoring component, which is installed on the side of the first probe away from the gap; And / or, the fuel rod gap measuring device further includes a guide mechanism connected to the detection mechanism for guiding the movement of the detection mechanism.

[0014] The fuel rod gap measuring device of the present invention has the following advantages: the fuel rod gap measuring device can be movably inserted into the gap between two adjacent fuel rods through a detection mechanism, and the first probe and the second probe of the detection mechanism move relative to each other along the width direction of the gap under the action of the fuel rods on both sides of the gap, and the measuring mechanism measures the gap width between two adjacent fuel rods according to the displacement of the first probe and the second probe, thereby realizing the measurement of the gap width between fuel rods. This solves the problem of measuring the gap between fuel rods in a high radioactive environment, improves the convenience and safety of measurement, and has the advantages of high positioning accuracy and simple operation. 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 fuel rod gap measuring device in the first embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the fuel rod gap measuring device from another angle is shown. Figure 3 yes Figure 1 A cross-sectional view of the fuel rod gap measuring device shown; Figure 4 yes Figure 3 Another sectional view of the fuel rod gap measuring device shown; Figure 5 yes Figure 1 A partial exploded view of the fuel rod gap measuring device shown. Figure 6 yes Figure 5 A schematic diagram of the detection mechanism of the fuel rod gap measuring device shown. Figure 7 yes Figure 6 A partially exploded schematic diagram of the detection mechanism of the fuel rod gap measuring device shown. Figure 8 yes Figure 7 Partial structure of the detection mechanism of the fuel rod gap measuring device shown; Figure 9 yes Figure 7 A schematic diagram of the first support structure of the fuel rod gap measuring device shown. Figure 10 yes Figure 7 A schematic diagram of the second support structure of the fuel rod gap measuring device shown; Figure 11 yes Figure 5 A schematic diagram of the rotating mechanism of the fuel rod gap measuring device shown. Figure 12 yes Figure 5A schematic diagram of the guide mechanism for the fuel rod gap measuring device shown; Figure 13 yes Figure 5 A schematic diagram of the video monitoring component structure of the fuel rod gap measuring device is shown. Figure 14 yes Figure 1 A schematic diagram of the fuel rod gap measuring device before measurement; Figure 15 yes Figure 1 The diagram shows a cross-sectional view of the fuel rod gap measuring device before measurement. Figure 16 yes Figure 1 The cross-sectional view of the fuel rod gap measuring device shown during measurement; Figure 17 This is a schematic diagram of the fuel rod gap measuring device in the second embodiment of the present invention; Figure 18 yes Figure 17 The diagram shows another angle of the fuel rod gap measuring device. 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," "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 2 A first embodiment of the fuel rod gap measuring device of the present invention is shown. This fuel rod gap measuring device is capable of measuring the gap between fuel rods in a highly radioactive environment, and can automatically locate the gap in an environment inaccessible and unmanageable by humans.

[0020] like Figure 1 and Figure 2 As shown, the fuel rod gap measuring device may include a detection mechanism 10 and a measuring mechanism 20. The detection mechanism 10 is movably inserted into the gap 200 between two adjacent fuel rods 100. The measuring mechanism 20 is disposed on the detection mechanism 10 and can be used to measure the width of the gap 200.

[0021] like Figures 3 to 8As shown, in this embodiment, the detection mechanism 10 may include a movable guide structure 11, a first probe 12, and a second probe 13. The movable guide structure 11 is used to guide the first probe 12 and the second probe 13 to move in the gap width direction. The first probe 12 and the second probe 13 can be moved relative to each other in the gap width direction under the action of the fuel rods on both sides of the gap. The first probe 12 and the second probe 13 can stop moving when they touch each other.

[0022] In this embodiment, the movable guide structure 11 may include a mounting base 111 and a guide rod 112. The mounting base 111 is for mounting the guide rod 112. The guide rod 112 may be arranged along the width direction of the gap 200 and may be used for movable guidance of the first probe 12 and the second probe 13.

[0023] Specifically, the mounting base 111 may include a first mounting plate 111a and a second mounting plate 111b disposed opposite to the first mounting plate 111a. The first mounting plate 111a and the second mounting plate 111b may be spaced apart in the direction in which the first probe 12 and the second probe 13 move relative to each other. The first mounting plate 111a and the second mounting plate 111b may be spaced apart in the width direction of the gap, and the first mounting plate 111a and the second mounting plate 111b may be disposed in parallel. In some embodiments, the mounting base 111 may further include a first connecting plate 111c, which can be used to connect the first mounting plate 111a and the second mounting plate 111b. In some embodiments, the first connecting plate 111c may be generally cross-shaped. A second connecting plate 111d is disposed on the side of the first connecting plate 111c away from the fuel rod 100, and a first boss 111e and a second boss 111f are disposed on the side of the first connecting plate 111c facing the fuel rod 100. The first mounting plate 111a, the second mounting plate 111b, the second connecting plate 111d, the first boss 111e, and the second boss 111f are all perpendicular to the first connecting plate 111c. The first mounting plate 111a has a first mounting hole 1111, and the second mounting plate 111b has a second mounting hole 1112. The first mounting hole 1111 and the second mounting hole 1112 are correspondingly and opposite to each other. The second connecting plate 111d has a first through hole 1113, which can be used for the rotating shaft 32 to pass through. The first boss 111e has a second through hole 1114, and the second boss 111f has a third through hole 1115. The second through hole 1114 can be used for the installation of the first adjusting component 18a, and the third through hole 1115 can be used for the installation of the second adjusting component 18b.

[0024] In this embodiment, the guide rod 112 is mounted on the first mounting plate 111a and the second mounting plate 111b. Specifically, one end of the guide rod 112 can be mounted in the first mounting hole 1111, and the other end can be mounted in the second mounting hole 1112. There can be two guide rods 112, which can be spaced apart between the first boss 111e and the second connecting plate 111d. In some other embodiments, the guide rod 112 is not limited to two; it can be one or more.

[0025] In this embodiment, both the first probe 12 and the second probe 13 can be cylindrical. A first cut surface 121 is provided on the side of the first probe 12 and the second probe 13 opposite to each other, and the first cut surface 121 can contact the fuel rod 100. A second cut surface 131 is provided on the side of the second probe 13 opposite to the first probe 12, and the second cut surface 131 can contact the fuel rod 100. When the first probe 12 and the second probe 13 can move relative to each other under the pressure of the fuel rods on both sides of the gap until the first probe 12 and the second probe 13 are at least partially in contact, the first probe 12 and the second probe 13 stop moving.

[0026] like Figure 6 , Figure 7 and Figure 9 As shown, in this embodiment, the detection mechanism further includes a first bracket 14 and a second bracket 15. The first probe 12 can be mounted on the first bracket 14. The second probe 13 can be mounted on the second bracket 15. The first bracket 14 and the second bracket 15 can be sleeved on the guide rod 112 and are movable along the length direction of the guide rod 112.

[0027] Specifically, in this embodiment, the first bracket 14 may include a first body 141 and a first extending protrusion 142. The first body 141 may include a first connecting portion 141c, a first sleeve portion 141a and a second sleeve portion 141b spaced apart on the side of the first connecting portion 141c opposite to the second bracket 15. The first connecting portion 141c can connect the first sleeve portion 141a and the second sleeve portion 141b. The first sleeve portion 141a and the second sleeve portion 141b can be correspondingly arranged with the two guide rods 112, and can be sleeved on the corresponding guide rods 112. The first body 141 is provided with a first through hole 1411 and a second through hole 1412, which can be correspondingly arranged with the two guide rods 112. A first through hole 1411 extends from the first connecting portion 141c to the first socket portion 141a, and a second through hole 1412 extends from the first connecting portion 141c to the second socket portion 141b. It should be noted that the number of these through holes corresponds to the number of guide rods 112. A first extension protrusion 142 protrudes from one end of the first body 141; specifically, the first extension protrusion 142 may be located at one end of the first connecting portion 141c. The first extension protrusion 142 can be used to mount the first probe 12. A first insertion hole 1421 is provided at the end of the first extension protrusion 142 away from the first body 141, into which the first probe 12 can be inserted.

[0028] like Figure 6 , Figure 7 and Figure 10As shown, specifically in this embodiment, the second bracket 15 may include a second body 151 and a second extending protrusion 152. The second body 151 may include a second connecting portion 151c, a third sleeve portion 151a and a fourth sleeve portion 151b spaced apart on the side of the second connecting portion 151c opposite to the second bracket 15. The second connecting portion 151c can connect the third sleeve portion 151a and the fourth sleeve portion 151b. The third sleeve portion 151a and the fourth sleeve portion 151b can be correspondingly arranged with the two guide rods 112, and can be sleeved on the corresponding guide rods 112. The second body 151 is provided with a third through hole 1511 and a fourth through hole 1512, which can be correspondingly arranged with the two guide rods 112. The third through hole 1511 extends from the second connecting portion 151c to the third socket portion 151a, and the fourth through hole 1512 extends from the second connecting portion 151c to the fourth socket portion 151b. It should be noted that the number of these through holes corresponds to the number of guide rods 112. A second extending protrusion 152 protrudes from one end of the second body 151; specifically, the second extending protrusion 152 may be located at one end of the second connecting portion 151c. The second extending protrusion 152 can be used to mount the second probe 13. A second insertion hole 1521 is provided at the end of the second extending protrusion 152 away from the second body 151, into which the second probe 13 can be inserted.

[0029] In this embodiment, the detection mechanism 10 further includes an elastic structure 16, which can be connected to the first probe 12 and the second probe 13. By setting the elastic structure 16, the first probe 12 and the second probe 13 can move relative to each other under the action of the elastic structure 16, and can be reset under the action of the elastic structure 16 when the detection mechanism 10 exits the gap 200.

[0030] In this embodiment, the elastic structure 16 may include a first mounting base 161, a second mounting base 162, and an elastic element 164. The first mounting base 161 is mounted on the first bracket 14, and the second mounting base 162 is mounted on the second bracket 15; the elastic element 164 is disposed between the first mounting base 161 and the second mounting base 162. Specifically, the first mounting base 161 may be fixedly mounted on the first sleeve portion 141a. The second mounting base 162 may be fixedly mounted on the third sleeve portion 151a, and the two may be disposed opposite to each other. A fixing shaft 163 is provided between the first mounting base 161 and the second mounting base 162. In some embodiments, the elastic element 164 may be sleeved on the fixing shaft 163, and its two ends abut against the first mounting base 161 and the second mounting base 162 respectively. In some embodiments, the elastic element 164 may be a spring. In some other embodiments, the fixed shaft 163 can be omitted, and the elastic element 164 can be a tension spring. The two ends of the elastic element 164 can be connected to the first mounting base 161 and the second mounting base 162 respectively.

[0031] In this embodiment, the detection mechanism 10 further includes a limiting component 17, which can be sleeved on the first bracket 14 and the second bracket 15 to limit the movement distance of the first probe 12 and the second probe 13 in the gap width direction.

[0032] Specifically, the limiting component 17 may include a first limiting structure 171, a second limiting structure 172, and a limiting pin 173. The first limiting structure 171 is installed at the gap between the first socket portion 141a and the second socket portion 141b. The second limiting structure 172 may be installed at the gap between the third socket portion 151a and the fourth socket portion 151b, and can be inserted into the first limiting structure 171. The limiting pin 173 may be installed on the second limiting structure 172 and can pass through the gap between the first bracket 14 and the second bracket 15. The first limiting structure 171 may include a first limiting part 1711 and a second limiting part 1712. The first limiting part 1711 is engaged and fixed to the first bracket 14. The second limiting part 1712 is disposed on the first limiting part 1711 and may be stacked on the second limiting structure 172. The second limiting part 1712 is provided with a limiting groove 1713 on the side facing the second limiting structure 172. The limiting pin 173 is partially placed in the limiting groove 1713, and the limiting pin 173 can move in the limiting groove 1713 when the first probe 12 and the second probe 13 move. The width of the limiting groove 1713 limits the maximum displacement of the first probe 12 and the second probe 13.

[0033] For example Figure 8 As shown, in this embodiment, the detection mechanism 10 further includes a first adjustment component 18a, which is disposed opposite to the first probe 12 to adjust the position of the first probe 12 in the width direction of the gap 200. In some embodiments, the first adjustment component 18a can be an adjustment rod, which can be installed in the second through hole 1114 of the first boss 111e, can extend towards the first probe 12, can contact the first probe 12, and can move the first probe 12 in the width direction of the gap 200 by rotation, thereby adjusting the position of the first probe 12. In some embodiments, the first adjustment component 18a can be omitted.

[0034] In this embodiment, the detection mechanism 10 further includes a second adjustment component 18b, which is disposed opposite to the second probe 13 to adjust the position of the second probe 13 in the width direction of the gap 200. In some embodiments, the second adjustment component 18b can be an adjustment rod, which can be installed in the third through hole 1115 of the second boss 111f, can extend toward the second probe 13, can contact the second probe 13, and can rotate to push the second probe 13 to move in the width direction of the gap 200, thereby adjusting the position of the second probe 13. In some embodiments, the second adjustment component 18b can be omitted.

[0035] In this embodiment, the detection mechanism 10 may include a guard rod assembly 19, which is spaced apart from the first probe 12 and / or the second probe 13 and is configured to fix the fuel rod 100 on one or both sides of the test gap.

[0036] In this embodiment, the rod guard assembly 19 is disposed between the first boss 111e and the second boss 111f. The rod guard assembly 19 may include a fixing frame 191 and rod guard wheels 192 disposed on the fixing frame 191. There may be two fixing frames 191, which are spaced apart. One fixing frame 191 may be connected to a first adjusting component 18a, specifically, the first adjusting component 18a may pass through the fixing frame 191. The other fixing frame 191 may be connected to a second adjusting component 18b, specifically, the second adjusting component 18b may pass through the fixing frame 191. There may be two rod guard wheels 192, which are spaced apart along the axial direction of the fuel rod 100. A first probe 12 and a second probe 13 may be disposed between the two rod guard wheels 192. Each rod guard wheel 192 may be rotatably connected to the two fixing frames 191 via a connecting shaft 193. In some embodiments, each guard rod wheel 192 may be provided with a guide groove 1921 in the circumferential direction, which can be used to guide and fix the fuel rods 100 on one or both sides of the gap.

[0037] In this embodiment, the measuring mechanism 20 can be mounted on the first support 14 and oriented towards the second support 15. In other embodiments, the measuring mechanism 20 can be mounted on the second support 15 and oriented towards the first support 14. The measuring mechanism 20 can be a displacement sensor, which can be used to measure the relative displacement between the second support 15 and the first support 14, thereby measuring the compression of the elastic structure 16, and further measuring the gap between the fuel rods 100.

[0038] like Figure 5 and Figure 11As shown, in this embodiment, the fuel rod gap measuring device further includes a rotating mechanism 30, which can be connected to the detection mechanism 20 and can drive the detection mechanism 20 to rotate. In some embodiments, the rotating mechanism 30 may include a fixed base 31, a rotating shaft 32, a bearing 34, and a knob 33. The fixed base 31 can be fixedly mounted on the guide mechanism 50, and the rotating shaft 32 can be mounted on the fixed base 31 and connected to the detection mechanism 30. Specifically, the rotating shaft 32 can extend from the fixed base 31 to the second connecting plate 111d, and can pass through the first through hole 1113 of the second connecting plate 111d, and can be connected and fixed to the second connecting plate 111d. The rotation of the rotating shaft 32 can drive the mounting base 111 to rotate, and in turn, drive the first probe 12 and the second probe 13 to rotate. The knob 33 can be connected to the rotating shaft 32 and can be operated by an operator. The bearing 34 can be mounted on the fixed base 31 and can be sleeved on the rotating shaft 32, thereby facilitating the rotation of the rotating shaft 32.

[0039] In this embodiment, the fuel rod gap measuring device further includes a temperature measuring structure 40, which can be mounted on the rotating mechanism 30 and fixedly connected to it. The temperature measuring structure 40 can be a temperature sensor. Specifically, the rotating mechanism 30 may also include a fixing plate 35, which is disposed on the fixing base 31 and extends toward the detection mechanism 10. The temperature measuring structure 40 can be connected and fixed to the fixing plate 35 and is positioned toward the first probe 12 and the second probe 13.

[0040] like Figure 5 and Figure 12 As shown, in this embodiment, the fuel rod gap measuring device further includes a guide mechanism 50, which can be connected to the detection mechanism 10 for guiding the movement of the detection mechanism 10. Specifically, the detection mechanism 10 can be mounted on the guide mechanism 50. The rotating mechanism 30 can be connected and fixed to the guide mechanism 50.

[0041] In this embodiment, the guiding mechanism 50 may include a base 51, a guide rail 52, a slider 53, and an elastic member 54. The base 51 may be longitudinally arranged, and a first mounting portion 511 and a second mounting portion 512 may be provided along the length of the base 51, spaced apart. The guide rail 52 may be disposed on the base 51. Specifically, there may be two guide rails 52, spaced apart along the width of the base 51. One end of each guide rail 52 may be fixed to the first mounting portion 511, and the other end may be fixed to the second mounting portion 512. In other embodiments, the guide rail 52 may not be limited to two; it may be one or more. The slider 53 may be sleeved on the guide rail 52 and may slide along the length of the guide rail 52. The rotating mechanism 30 may be mounted on the slider 53 and connected and fixed to it. A connecting rod 55 may be provided between the sliding member 53 and the second mounting part 512. The elastic member 54 may be sleeved on the connecting rod 55, with one end abutting against the sliding member 53 and the other end abutting against the second mounting part 512.

[0042] In this embodiment, the fuel rod gap measuring device further includes a support base 60, which can be disposed on one side of the guide mechanism 50 and can be connected and fixed to the guide mechanism 50. The support base 60 can support the video monitoring component 70.

[0043] In this embodiment, the fuel rod gap measuring device further includes a video monitoring component 70, which can be fixedly installed on the support base 60. The video monitoring component 70 can perform preliminary correction on the detection mechanism 10, so that the detection mechanism 10 is roughly aligned with the center of the fuel rod gap being measured.

[0044] like Figure 5 and Figure 13 As shown, in this embodiment, the video surveillance component 70 may include a support column 71, a first set of video surveillance structures 72, a second set of video surveillance structures 73, and a supplementary lighting structure 74. The support column 71 may be mounted on a support base 60. The first set of video surveillance structures 72, the second set of video surveillance structures 73, and the supplementary lighting structure 74 may be spaced apart along the axial direction of the support column 71. The first set of video surveillance structures 72 and the second set of video surveillance structures 73 may be used to obtain the position of the gap 200 between the first probe 12 and the second probe 13 and the fuel rod 100. In some embodiments, the video surveillance structures are not limited to two sets, but may be one set or more than two sets.

[0045] Each of the first video surveillance structures 72 may include a first connecting bracket 721 and a first camera 722. The first connecting bracket 721 may be sleeved on the support column 71. The first camera 722 may be mounted on the first connecting bracket 721. The first connecting bracket 721 is movable, thereby facilitating the adjustment of the position of the first camera 722. The first camera 722 is rotatable, and its tilt angle can be adjusted by rotation.

[0046] The second video surveillance structure 73 may include a second connecting bracket 731 and a second camera 732. The second connecting bracket 731 may be sleeved on the support column 71. The second camera 732 may be mounted on the second connecting bracket 731. The second connecting bracket 731 may be movable, thereby facilitating the adjustment of the position of the second camera 732. The second camera 732 may be rotatable, and its tilt angle may be adjusted by rotation.

[0047] In this embodiment, the supplementary lighting structure 74 may include a third connecting bracket 741, a fixing rod 742, a light source 743, and a fourth connecting bracket 744. The third connecting bracket 741 can be connected to the support column 71 and can be sleeved on the support column 71. The fixing rod 742 can be disposed on the third connecting bracket 741 and extends upward, and the light source 743 can be connected to the fixing rod 742 through the fourth connecting bracket 744.

[0048] like Figures 14 to 16 As shown, before measuring the gap 200 of the fuel rod 100, the fuel rod gap measuring device first adjusts the first limiting structure 171, the second limiting structure 172, and the limiting pin 173 to make the distance between the first probe 12 and the second probe 13 slightly larger than the gap 200 of the fuel rod 100. The video monitoring component 70 performs preliminary correction on the fuel rod gap measuring device, so that the detection mechanism 10 is roughly aligned with the center of the gap of the fuel rod being measured. The fuel rod gap measuring device is slowly advanced. When the guard wheel 192 contacts the fuel rod 100, the first probe 12 and the second probe 13 on the fuel rod gap measuring device first contact the left and right sides of the fuel rod and are passively retracted. The first probe 12 and the second probe 13 continue to advance, and under the action of the limiting component 17, the first probe 12 and the second probe 13 stop their relative movement. At this time, the measurement data of the measuring mechanism 20 is read, and the fuel rod gap measuring device is returned to the initial state, completing the measurement of the fuel rod gap.

[0049] To accommodate the measurement of the gap between fuel rods 100, the fuel rod gap measuring device is equipped with three degrees of freedom: forward and backward movement, left and right movement, and rotation. Each degree of freedom corresponds to a relative position state of the fuel assembly, and the three degrees of freedom working together can handle various relative position states of the fuel rods.

[0050] By setting the guide mechanism 50, the detection mechanism 10 can move back and forth. Generally, the detection mechanism 10 can be connected to the drive system, so that it can quickly approach the fuel rod under the control of the drive system. After the guard wheel 192 contacts the fuel rod 100, it passively retreats to protect the fuel assembly. The left and right movement is when the probe contacts the side of the left and right fuel rods and passively retracts, that is, it moves along the width direction of the gap 200 between the fuel rods 100.

[0051] By setting the rotating mechanism 30, the rotating detection mechanism 10 can adapt to the position of the fuel rod being tested. When the fuel rod 100 is slightly tilted around the vertical center, the rotation of the detection mechanism 10 will actively allow the probe to adapt to the fuel rod being tested.

[0052] Figure 17 and Figure 18 The second embodiment of the fuel rod gap measuring device of the present invention is shown. The difference between the second and third embodiments is that the fixed shaft 163 in the elastic structure 16 can be omitted, and the elastic member 164 can be a tension spring. The two ends of the elastic member 164 can be connected to the first mounting base 161 and the second mounting base 162 respectively.

[0053] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A fuel rod gap measurement device, characterized by, include: The detection mechanism (10) is movably inserted into the gap (200) between two adjacent fuel rods (100), and includes a first probe (12) and a second probe (13). The first probe (12) and the second probe (13) are relatively movable along the width direction of the gap (200) under the action of the fuel rods (100) on both sides of the gap (200). A measuring mechanism (20), disposed on the detection mechanism (10), is configured to measure the gap width between two adjacent fuel rods (100) based on the displacement of the first probe (12) and the second probe (13); The detection mechanism (10) further includes an elastic structure (16), which is connected to the first probe (12) and the second probe (13); The fuel rod gap measuring device further includes a rotating mechanism (30), which is connected to the detection mechanism (10) to drive the detection mechanism (10) to rotate.

2. The fuel rod gap measurement device of claim 1, wherein, The detection mechanism (10) further includes a first bracket (14) and a second bracket (15); the first probe (12) is mounted on the first bracket (14); the second probe (13) is mounted on the second bracket (15); The elastic structure (16) includes a first mounting base (161), a second mounting base (162), and an elastic element (164); the first mounting base (161) is mounted on the first bracket (14), and the second mounting base (162) is mounted on the second bracket (15); the elastic element (164) is disposed between the first mounting base (161) and the second mounting base (162); The measuring mechanism (20) is mounted on the first bracket (14) and is positioned facing the second bracket (15); Alternatively, the measuring mechanism (20) may be mounted on the second bracket (15) and positioned toward the first bracket (14).

3. The fuel rod gap measurement device of claim 2, wherein, The detection mechanism (10) further includes a limiting component (17), which is sleeved on the first bracket (14) and the second bracket (15) to limit the movement distance of the first probe (12) and the second probe (13) in the width direction of the gap (200).

4. The fuel rod gap measuring device according to claim 2, characterized in that, The detection mechanism (10) further includes a movable guide structure (11); the movable guide structure (11) is used to guide the first probe (12) and the second probe (13) to move in the width direction of the gap (200); The movable guide structure (11) includes a mounting base (111) and a guide rod (112). The mounting base (111) includes a first mounting plate (111a) and a second mounting plate (111b) disposed opposite to the first mounting plate (111a); the first mounting plate (111a) and the second mounting plate (111b) are spaced apart in the direction in which the first probe (12) and the second probe (13) move relative to each other; the guide rod (112) is mounted on the first mounting plate (111a) and the second mounting plate (111b), and the first bracket (14) and the second bracket (15) are sleeved on the guide rod (112) and are movable along the length direction of the guide rod (112).

5. The fuel rod gap measuring device according to claim 4, characterized in that, The rotating mechanism (30) includes a fixed base (31), a rotating shaft (32), a bearing (34), and a knob (33); The rotating shaft (32) is mounted on the fixed base (31) and connected to the detection mechanism (10); the knob (33) is connected to the rotating shaft (32); the bearing (34) is mounted on the fixed base (31) and sleeved on the rotating shaft (32).

6. The fuel rod gap measuring device according to claim 1, characterized in that, The detection mechanism (10) further includes a first adjustment component (18a), which is disposed opposite to the first probe (12) to adjust the position of the first probe (12) in the width direction of the gap (200); And / or, the detection mechanism (10) further includes a second adjustment component (18b), which is disposed opposite to the second probe (13) to adjust the position of the second probe (13) in the width direction of the gap (200).

7. The fuel rod gap measuring device according to claim 1, characterized in that, The detection mechanism (10) further includes a guard rod assembly (19), which is spaced apart from the first probe (12) and / or the second probe (13) and is configured to fix the fuel rod (100) on one or both sides of the gap to be measured.

8. The fuel rod gap measuring device according to claim 1, characterized in that, The fuel rod gap measuring device further includes a video monitoring component (70), which is installed on the side of the first probe (12) away from the gap (200); And / or, the fuel rod gap measuring device further includes a guide mechanism connected to the detection mechanism (10) for guiding the movement of the detection mechanism (10).

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