A nuclear fuel assembly shape detection device
Patent Information
- Application Number
- CN202521974671.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-15
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-09-15
AI Technical Summary
[0004]有鉴于此，本实用新型的目的是提供一种核燃料组件外形检测装置，解决核燃料组件在吊运至检测装置的支撑定位机构时因晃动导致不易快速定位的问题
[0010]本实用新型的有益效果：通过齿轮与双齿条的传动设计，使检测组件沿立柱滑动时，能够驱动锥形导向套反向移动，实现检测组件与定位结构的联动。当吊具吊运燃料组件下落时，锥形导向套上移到顶，组件底部沿锥面滑入导向套内，使定位销与核燃料组件能快速插合，实现快速对准，精准定位，提升了核燃料组件的定位效率与准确性，缩短了检测时间，优化了核燃料组件生产制造的整体流程，提高了生产效率。解决核燃料组件在吊运至检测装置的支撑定位机构时因晃动导致不易快速定位的问题。
Smart Images
Figure CN224907596U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of nuclear fuel assembly performance testing technology, specifically relating to a nuclear fuel assembly shape inspection device. Background Technology
[0002] Nuclear fuel assemblies are the core components of a nuclear reactor core, with precise structures and extremely stringent dimensional requirements. Each assembly consists of numerous fuel rods, positioning grids, upper and lower mounting bases, and other components. During manufacturing, transportation, storage, and assembly / disassembly, external forces can cause overall or partial deformation, leading to issues such as verticality deviations, twisting, or overall length deviations. These dimensional deviations severely affect the assembly's positioning accuracy within the core and its thermal-hydraulic performance, and may even cause abrasions, increased vibration, or difficulties in loading and unloading during reactor operation, threatening the safe and stable operation of the reactor. Therefore, accurate dimensional inspection of nuclear fuel assemblies before leaving the factory, before entering the reactor, or after maintenance is a crucial step in ensuring the safe and efficient operation of a nuclear power plant. However, current nuclear fuel assembly inspection methods typically involve manually hoisting the assemblies and placing them onto a support and positioning mechanism. During hoisting, the assemblies inevitably sway, making rapid positioning difficult.
[0003] In view of this, the inventor conducted in-depth research on the aforementioned deficiencies in the prior art, which led to the creation of this case. Utility Model Content
[0004] In view of this, the purpose of this utility model is to provide a nuclear fuel assembly shape inspection device to solve the problem that nuclear fuel assemblies are difficult to position quickly due to shaking when being hoisted to the support and positioning mechanism of the inspection device.
[0005] This utility model solves the above-mentioned technical problems through the following technical means: A nuclear fuel assembly shape inspection device includes a base, a column fixedly mounted on the base, a support and positioning component for positioning the nuclear fuel assembly, a detection component slidably mounted on the column, and a correction mechanism for pushing and correcting the nuclear fuel assembly. The support and positioning component is mounted on the base and includes a support column fixedly mounted on the base, a fixed platform fixedly mounted on the top of the support column, and a conical guide sleeve slidably mounted on the support column. Four support blocks are fixedly mounted at the four corners of the fixed platform, and positioning pins are fixedly mounted on two diagonally opposite support blocks. A first rack is fixedly mounted on one side of the conical guide sleeve. A gear is rotatably mounted on the base, and the gear meshes with the first rack. A second rack is fixedly mounted on the detection component, and the second rack corresponds to the position of the gear. When the detection component is at its lowest point, the top of the support and positioning component is higher than the top of the detection component.
[0006] Based on the above technical solution, the present invention has made the following improvements: Furthermore, linear guide rails are fixedly installed on both sides of the column, and a mounting bracket is fixedly installed on the top of the column. Fixed pulleys are rotatably installed at both ends of the mounting bracket. A counterweight is slidably installed on the linear guide rail, and a pull rope is fixedly installed on the counterweight. The pull rope rests on the fixed pulley and is fixedly connected to the detection component. This structural design utilizes the gravity of the counterweight to balance the weight of the detection mechanism, effectively reducing the load pressure on the servo motor and reducing energy consumption. At the same time, the pull rope is guided by the fixed pulley, assisting the detection mechanism to slide smoothly along the linear guide rail. Combined with the servo motor drive, this makes the movement of the detection component more precise and improves the stability of the detection process.
[0007] Furthermore, the detection assembly includes a movable seat, a mounting platform fixedly mounted on the movable seat, and multiple shape detection sensors and multiple length detection sensors slidably mounted on the mounting platform. A servo motor is mounted on the slide rail of the linear guide, the movable seat is fixedly mounted on the servo motor, the second rack is fixedly mounted on the bottom of the movable seat, and a through groove is provided in the center of the mounting platform. By setting multiple shape detection sensors and length detection sensors, the shape, position, size, and length of the nuclear fuel assembly can be detected. The through groove design facilitates the passage of the nuclear fuel assembly through the detection area, enabling the detection sensors to cover the detection area from all directions and improve the comprehensiveness of the detection.
[0008] Furthermore, the lower end of the base is equipped with several heavy-duty cast iron ground anchors. This structural design can firmly anchor the detection device to the ground, enhancing the overall stability of the device and preventing displacement or shaking caused by external interference or equipment vibration during the detection process. It also provides a reliable reference for supporting positioning components, detection components, etc., ensuring the accuracy and consistency of the detection results.
[0009] Furthermore, a grating ruler is fixedly installed on the column. This structural design provides height displacement feedback for the detection component. By measuring the height position of the detection mechanism in real time, it assists in measuring the length of the nuclear fuel assembly, improving displacement accuracy and repeatability, ensuring that the detection data of the detection component at different positions has a reliable positional reference, and further enhancing the accuracy of dimensional detection.
[0010] The beneficial effects of this invention are as follows: Through the transmission design of gears and double racks, the detection component slides along the column, driving the conical guide sleeve to move in the opposite direction, thus achieving linkage between the detection component and the positioning structure. When the lifting device lowers the fuel assembly, the conical guide sleeve moves to the top, and the bottom of the assembly slides into the guide sleeve along the conical surface, allowing the positioning pin to quickly engage with the nuclear fuel assembly, achieving rapid alignment and precise positioning. This improves the positioning efficiency and accuracy of the nuclear fuel assembly, shortens the detection time, optimizes the overall process of nuclear fuel assembly production, and increases production efficiency. It also solves the problem of difficulty in quickly positioning nuclear fuel assemblies due to shaking when lifted to the support and positioning mechanism of the detection device. Attached Figure Description
[0011] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a schematic diagram of the structure of a nuclear fuel assembly shape detection device according to an embodiment of the present invention. Figure 1 ; Figure 2 yes Figure 1 An enlarged view of point A; Figure 3 This is a schematic diagram of the structure of a nuclear fuel assembly shape detection device according to an embodiment of the present invention. Figure 2 ; Figure 4 yes Figure 3 An enlarged view of point B; Figure 5 yes Figure 3 An enlarged view of point C; Among them, 1-base, 2-column, 3-support and positioning component, 4-detection component, 5-correction mechanism, 6-support column, 7-fixed platform, 8-conical guide sleeve, 9-support block, 10-positioning pin, 11-first rack, 12-gear, 13-second rack, 14-linear guide rail, 15-mounting bracket, 16-fixed pulley, 17-counterweight block, 18-pull rope, 19-movable seat, 20-mounting platform, 21-shape detection sensor, 22-length detection sensor, 23-slide rail, 24-servo motor, 25-through groove, 26-heavy cast iron ground anchor, 27-grating ruler. Detailed Implementation
[0012] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: like Figures 1 to 5As shown, a nuclear fuel assembly shape inspection device includes a base 1, a column 2 fixedly mounted on the base 1, a support and positioning component 3 for positioning the nuclear fuel assembly, a detection component 4 slidably mounted on the column 2, and a correction mechanism 5 for pushing and correcting the nuclear fuel assembly. The column 2 supports and moves the detection component 4 and the correction mechanism 5. The detection component 4 is used to inspect the shape and dimensions of the nuclear fuel assembly, detecting problems such as verticality deviation, twisting, or overall length deviation. The correction mechanism 5 corrects the nuclear fuel assembly based on the shape and position problems detected by the detection component 4.
[0013] The support positioning component 3 is mounted on the base 1. The support positioning component 3 includes a support column 6 fixedly mounted on the base 1, a fixed platform 7 fixedly mounted on the top of the support column 6, and a conical guide sleeve 8 slidably mounted on the support column 6. Four support blocks 9 are fixedly mounted at the four corners of the fixed platform 7. Positioning pins 10 are fixedly mounted on the two diagonally opposite support blocks 9. The nuclear fuel assembly is inserted through the positioning pins 10. A first rack 11 is fixedly mounted on one side of the conical guide sleeve 8. A gear 12 is rotatably mounted on the base 1. The gear 12 meshes with the first rack 11. A second rack 13 is fixedly mounted on the detection component 4. The second rack 13 corresponds to the position of the gear 12. When the detection component is at its lowest point, the top of the support positioning component is higher than the top of the detection component. When the lifting device hoists the nuclear fuel assembly to the fixed platform 7, the bottom of the nuclear fuel assembly quickly engages with the positioning pin 10 along the conical guide sleeve 8. Then, the detection component 4 moves upward. At this time, the second rack 13 drives the gear 12 to rotate, causing the first rack 11 to move downward, which in turn moves the conical guide sleeve 8 down from the through groove 25 in the center of the mounting platform 20. Then, the shape detection sensor 21 and the length detection sensor 22 are controlled to perform shape and position detection on the nuclear fuel assembly. After the detection is completed, the detection component 4 moves downward so that the second rack 13 engages with the gear 12, and then drives the first rack 11 to move upward, thereby moving the conical guide sleeve 8 upward, which is convenient for the next placement and detection of the nuclear fuel assembly.
[0014] Specifically, linear guide rails 14 are fixedly installed on both sides of the column 2, and a mounting bracket 15 is fixedly installed on the top of the column 2. Fixed pulleys 16 are rotatably installed at both ends of the mounting bracket 15. A counterweight 17 is slidably installed on the linear guide rails 14, and a pull rope 18 is fixedly installed on the counterweight 17. The pull rope 18 rests on the fixed pulleys 16 and is fixedly connected to the detection component 4. This structural design utilizes the gravity of the counterweight 17 to balance the weight of the detection mechanism, effectively reducing the load pressure on the servo motor 24 and reducing energy consumption. At the same time, the pull rope 18 is guided by the fixed pulleys 16 to assist the detection mechanism in sliding smoothly along the linear guide rails 14. Combined with the drive of the servo motor 24, this makes the movement of the detection component 4 more precise and improves the stability of the detection process.
[0015] Specifically, the detection component 4 includes a movable seat 19, a mounting platform 20 fixedly mounted on the movable seat 19, and multiple shape detection sensors 21 and multiple length detection sensors 22 slidably mounted on the mounting platform 20. A servo motor 24 is mounted on the slide rail 23 of the linear guide rail 14, and the movable seat 19 is fixedly mounted on the servo motor 24. The second rack 13 is fixedly mounted on the bottom of the movable seat 19, and the mounting platform 20 has a through groove 25 in the center. By setting multiple shape detection sensors 21 and length detection sensors 22, the shape, position, size, and length of the nuclear fuel assembly can be detected. The through groove 25 is designed to facilitate the nuclear fuel assembly to pass through the detection area, so that the detection sensors can cover the detection area in all directions, improving the comprehensiveness of the detection.
[0016] Specifically, the lower end of the base 1 is provided with several heavy-duty cast iron ground anchors 26. This structural design can firmly anchor the detection device to the ground, enhance the overall stability of the device, avoid displacement or shaking caused by external interference or equipment vibration during the detection process, provide a reliable reference for supporting the positioning component 3, detection component 4, etc., and ensure the accuracy and consistency of the detection results.
[0017] Specifically, a grating ruler 27 is fixedly installed on the column 2. This structural design can provide height displacement feedback for the detection component 4. By measuring the height position of the detection mechanism in real time, it can assist in measuring the length of the nuclear fuel assembly, improve displacement accuracy and repeatability, ensure that the detection data of the detection component 4 at different positions has a reliable position reference, and further enhance the accuracy of the external dimension detection.
[0018] The method of using this utility model is as follows: The device is securely installed on the ground by the heavy cast iron ground anchor 26 at the lower end of the base 1. In use, the nuclear fuel assembly is first hoisted to the fixed platform 7 of the support and positioning assembly 3 by a hoisting tool, so that its bottom slides down along the conical guide sleeve 8 and engages with the positioning pin 10 on the diagonal support block 9 of the fixed platform 7 to complete the positioning; the servo motor 24 is started to drive the detection assembly 4 to move upward along the linear guide rail 14 of the column 2. At this time, the second rack 13 at the bottom of the movable seat 19 drives the gear 12 to rotate, and the gear 12 drives the first rack 11 to move downward, so that the conical guide sleeve 8 moves downward along the support column 6 and moves away from the center of the mounting platform 20. The through slot 25 is withdrawn; the shape detection sensor 21 and length detection sensor 22 on the sliding mounting platform 20 are controlled to the appropriate position to perform shape and position detection such as verticality and torsion, as well as length detection on the nuclear fuel assembly. The grating ruler 27 on the column 2 provides real-time feedback on the height displacement of the detection assembly 4 to help improve accuracy; if a problem is found during detection, the correction mechanism 5 corrects it according to the result; after the detection is completed, the servo motor 24 is controlled to drive the detection assembly 4 to move down, the second rack 13 drives the gear 12 to rotate in the opposite direction, causing the first rack 11 to move up, and the conical guide sleeve 8 moves up and reset along the support column 6; finally, the qualified assembly is lifted to the next process by the hoist.
[0019] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model. Technologies, shapes, and structural parts not described in detail in this utility model are all known technologies.
Claims
1. A nuclear fuel assembly shape inspection device, comprising a base (1), a column (2) fixedly mounted on the base (1), a support and positioning component (3) for positioning the nuclear fuel assembly, a detection component (4) slidably mounted on the column (2), and a correction mechanism (5) for pushing and correcting the nuclear fuel assembly, wherein the support and positioning component (3) is disposed on the base (1), characterized in that: The support positioning component (3) includes a support column (6) fixedly installed on the base (1), a fixed platform (7) fixedly installed on the top of the support column (6), and a conical guide sleeve (8) slidably installed on the support column (6). Four support blocks (9) are fixedly installed at the four corners of the fixed platform (7), and positioning pins (10) are fixedly installed on the two diagonally opposite support blocks (9). A first rack (11) is fixedly installed on one side of the conical guide sleeve (8). A gear (12) is rotatably installed on the base (1), and the gear (12) meshes with the first rack (11). A second rack (13) is fixedly installed on the detection component (4), and the second rack (13) corresponds to the position of the gear (12). When the detection component (4) is at its lowest point, the top of the support positioning component (3) is higher than the top of the detection component (4).
2. The nuclear fuel assembly shape inspection device according to claim 1, characterized in that: Linear guide rails (14) are fixedly installed on both sides of the column (2), and a mounting bracket (15) is fixedly installed on the top of the column (2). Fixed pulleys (16) are rotatably installed at both ends of the mounting bracket (15). A counterweight (17) is slidably installed on the linear guide rail (14), and a pull rope (18) is fixedly installed on the counterweight (17). The pull rope (18) is placed on the fixed pulley (16) and fixedly connected to the detection component (4).
3. The nuclear fuel assembly shape inspection device according to claim 2, characterized in that: The detection component (4) includes a movable seat (19), a mounting platform (20) fixedly mounted on the movable seat (19), and multiple shape detection sensors (21) and multiple length detection sensors (22) slidably mounted on the mounting platform (20). A servo motor (24) is slidably mounted on the slide rail (23) of the linear guide rail (14). The movable seat (19) is fixedly mounted on the servo motor (24). The second rack (13) is fixedly mounted on the bottom of the movable seat (19). A through groove (25) is provided in the center of the mounting platform (20).
4. The nuclear fuel assembly shape inspection device according to claim 3, characterized in that: The lower end of the base (1) is provided with several heavy cast iron ground anchors (26).
5. The nuclear fuel assembly shape inspection device according to claim 4, characterized in that: A grating ruler (27) is fixedly installed on the column (2).