A handheld foreign object retrieval device for use in nuclear power plants in the spent fuel pool

Abstract

This utility model discloses a handheld foreign object retrieval device for spent water pools in nuclear power plants, relating to the field of foreign object retrieval technology. It includes a main component, a power transmission component, and a retrieval component. The main component comprises a power transmission component for fixing at the axial middle position and a rod body for the retrieval component at the axial bottom position. The power transmission component includes a synchronous pulley I, a main shaft, and a wheel axle. Synchronous pulley I is mounted on one side of the rod body, and the wheel axle passes through the rod body via bearings. Synchronous pulleys II and IV are fixedly installed at both ends of the wheel axle, respectively. Synchronous pulleys I and II are connected by a synchronous belt I. The main shaft is located at the axial bottom position of the rod body and passes through the rod body via bearings, with both ends extending out from both sides of the rod body. Through the active winding design of the double-helix fine-mesh wire mesh, its symmetrical distribution expands the retrieval area, and its fine mesh structure can intercept tiny foreign objects, completely solving the problems of "difficult and unclean retrieval" of traditional devices.

Description

Technical Field

[0001] This utility model belongs to the field of water surface foreign object retrieval technology, specifically, it relates to a handheld foreign object retrieval device for the spent fuel pool of a nuclear power plant. Background Technology

[0002] The spent fuel pool (hereinafter referred to as "spent pool") of a nuclear power plant is a critical facility for storing spent fuel assemblies. Its surface is prone to foreign matter accumulation due to equipment maintenance, environmental sedimentation, and other factors, such as metal scraps, insulating fibers, and fragments of sealing gaskets. Prolonged retention of these foreign objects poses multiple risks: First, they may become entangled in lifting equipment and monitoring instruments within the spent pool, causing equipment jamming or malfunction, affecting the safety of spent fuel transfer and storage; second, some foreign objects may dissolve or decompose, contaminating the spent pool water quality, affecting the cooling effect of spent fuel, and even increasing the risk of radiation leakage; third, traditional salvage methods have significant shortcomings.

[0003] Existing devices are mostly simple structures of "pole body + flat net bag", which can only passively receive large-sized foreign objects. Small particles are easy to slip through the net, resulting in incomplete retrieval. In addition, the pole body has poor operational flexibility and it is difficult to accurately aim at foreign objects when operating from a distance, resulting in low retrieval efficiency. Although some electric retrieval devices can improve efficiency, the electrical components are prone to aging and failure in the radiation environment of the spent pond, resulting in high maintenance costs and the risk of failure due to power outages.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies.

[0005] Therefore, in order to solve the above problems, this utility model provides a handheld foreign object retrieval device for the spent fuel pool surface of nuclear power plants. Utility Model Content

[0006] In order to overcome the above-mentioned technical problems, the purpose of this utility model is to provide a handheld foreign object retrieval device for the spent fuel pool surface of nuclear power plants.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A handheld foreign object retrieval device for a nuclear power plant's spent pool includes a main component, a power transmission component, and a retrieval component.

[0009] The main component includes a power transmission component for fixing the axial middle position and a rod for the retrieval component at the axial bottom position;

[0010] The power transmission assembly includes a synchronous pulley I, a main shaft, and a wheel axle. The synchronous pulley I is mounted on one side of the rod body. The wheel axle passes through the rod body through a bearing. Synchronous pulleys II and IV are fixedly mounted at both ends of the wheel axle, and synchronous pulleys I and II are connected by a synchronous belt I. The main shaft is located at the bottom axial position of the rod body and passes through the rod body through a bearing. The two ends of the main shaft extend out to both sides of the rod body, and synchronous pulleys III are fixedly mounted on the main shaft. Synchronous pulleys III and IV are connected by a synchronous belt II.

[0011] The salvage assembly includes end cap I, end cap III, fine wire mesh I, and fine wire mesh II welded to the main shaft. End cap I and end cap III are symmetrically distributed along the axis of the rod. Fine wire mesh I is located on the side of end cap I away from the rod, and fine wire mesh II is located on the side of end cap III away from the rod.

[0012] As a preferred embodiment of this invention, the main component further includes a fall arrestor ring that is fixed to the top of the pole by welding.

[0013] As a preferred technical solution of this utility model, the power transmission assembly further includes a crank handle, which passes through a bearing through one side wall of the rod corresponding to the synchronous wheel I and is connected to the synchronous wheel I.

[0014] As a preferred technical solution of this utility model, the fixing of the synchronous wheel I to the crank handle, the fixing of the synchronous wheels II and IV to the wheel axle, and the fixing of the synchronous wheel III to the main shaft are achieved by interference fit or keyway and key fit.

[0015] As a preferred embodiment of this invention, the main shaft is hollow and filled with foam material.

[0016] In a preferred embodiment of this invention, the synchronous pulleys II, III, and IV have the same diameter, and the diameter of synchronous pulley I is twice that of synchronous pulley II.

[0017] As a preferred embodiment of this utility model, both the fine wire mesh I and the fine wire mesh II are spiral-shaped.

[0018] As a preferred embodiment of this utility model, an end cap II is provided on one side of the fine wire mesh I, and a threaded hole is provided in the middle of the end cap II. The end cap II is fixed to one end of the main shaft by screws engaging with the threaded hole. An end cap IV is provided on one side of the fine wire mesh II, and the end cap IV is fixed to the main shaft in the same way as the end cap II.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In this utility model, the active winding design of the double-helix fine wire mesh not only expands the retrieval area due to its symmetrical distribution, but also intercepts tiny foreign objects due to its fine mesh structure, thus completely solving the problem of "difficult and unclean retrieval" of traditional devices.

[0021] 2. This utility model can be operated by one person, saving manpower and improving work efficiency.

[0022] 3. This utility model adopts a purely mechanical structure, which is simple to manufacture, easy to maintain, convenient to use, and easy to promote. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure label:

[0026] 1. Rod body; 2. Synchronous pulley I; 3. Synchronous belt I; 4. Synchronous pulley II; 5. End cap I; 6. Fine wire mesh I; 7. Main shaft; 8. End cap II; 9. Threaded hole; 10. Screw; 11. Synchronous belt II; 12. Synchronous pulley III; 13. End cap III; 14. Fine wire mesh II; 15. End cap IV; 16. Synchronous pulley IV; 17. Axle; 18. Crank handle; 19. Anti-fall ring. Detailed Implementation

[0027] The utility model will now be further described with reference to the accompanying drawings and specific embodiments:

[0028] According to an embodiment of the present invention, a handheld foreign object retrieval device for a nuclear power plant in a spent water pool includes a main body component, a power transmission component, and a retrieval component.

[0029] Please see Figure 1 The main components include a power transmission assembly for fixing the middle position of the axis and a retrieval assembly at the bottom position of the axis. The rod 1 is the core support carrier of the entire device, and it is also convenient for operators to hold it for remote operation. In addition, the installation position of each component is clearly defined by axial partitioning to ensure the stability and compactness of the overall structure and to avoid component shaking from affecting the retrieval accuracy.

[0030] Please see Figure 1The power transmission assembly includes a synchronous pulley I2, a main shaft 7, and a wheel axle 17. Synchronous pulley I2 is mounted on one side of the rod body 1. The wheel axle 17 passes through the rod body 1 via bearings. Synchronous pulleys II4 and IV16 are fixedly mounted at both ends of the wheel axle 17, respectively. Synchronous pulleys I2 and II4 are connected by a synchronous belt I3. The main shaft 7 is located at the axial bottom end of the rod body 1 and passes through the rod body 1 via bearings. Both ends of the main shaft 7 extend out from both sides of the rod body 1, and synchronous pulley III12 is fixedly mounted on the main shaft 7. Synchronous pulley III12 and IV16 are connected by a synchronous belt II. 11. Transmission connection: Synchronous pulley I2 serves as the first component for power input, wheel axle 17 acts as an intermediate transmission bridge, and main shaft 7 serves as the direct mounting carrier for the salvage assembly. By driving synchronous pulley I2 to rotate, synchronous pulley I2 drives synchronous pulley II4 to rotate via synchronous belt I3, synchronous pulley II4 drives wheel axle 17 to rotate, wheel axle 17 drives synchronous pulley IV16 to rotate, synchronous pulley IV16 drives synchronous pulley III12 to rotate via synchronous belt II11, synchronous pulley III12 drives main shaft 7 to rotate, and the rotation of main shaft 7 will drive the salvage assembly to rotate, thereby performing salvage operations on debris;

[0031] Please see Figure 1 The salvage assembly includes end cap I5, end cap III13, fine wire mesh I6, and fine wire mesh II14 welded to the main shaft 7. End cap I5 and end cap III13 are symmetrically distributed along the axis of the rod 1. Fine wire mesh I6 is located on the side of end cap I5 away from the rod 1, and fine wire mesh II14 is located on the side of end cap III13 away from the rod 1. Both fine wire mesh I6 and fine wire mesh II14 are spiral-shaped. End cap I5 and end cap III13 are fixed to the main shaft 7 by welding, serving as fine wire mesh I6 and fine wire mesh II14 respectively. The fixed end of wire mesh II14 near the pole 1 has a high welded connection with good strength and stability, which can prevent the wire mesh from falling off when rotating at high speed. Fine wire mesh I6 and fine wire mesh II14 are the core salvage components. They are both designed as spirals and symmetrically distributed along the pole axis. When the spiral structure rotates under the drive of the main shaft, it will actively pull foreign objects on the water surface into the net. The fine mesh design can intercept small foreign objects and solve the problem of incomplete salvage. The symmetrical distribution can balance the weight at both ends of the main shaft and avoid the device from shaking due to the shift of the center of gravity during rotation.

[0032] Please see Figure 1 The main component also includes a fall arrestor ring 19 that is fixed to the top of the rod 1 by welding. The fall arrestor ring 19 is fixed to the top of the rod by welding, which can prevent the device from accidentally falling into the waste pool during operation, and also facilitates the hanging and storage of the device when it is not in use.

[0033] Please see Figure 1The power transmission assembly also includes a crank handle 18. The crank handle 18 passes through the rod body 1 through a bearing and is connected to the synchronous wheel I2. The crank handle 18 serves as a manual power input component. Its design does not rely on electric drive, which avoids the problem of easy failure of electric components in the radiation environment of nuclear power plants. It also allows operators to flexibly control the rotation speed according to the amount of foreign objects. When there are many foreign objects, the rotation is slow to ensure complete entrainment, and when there are few foreign objects, the rotation is fast to improve efficiency, resulting in greater operational flexibility.

[0034] Please see Figure 1 The synchronous pulley I2 is fixed to the crank handle 18, the synchronous pulleys II4 and IV16 are fixed to the wheel axle 17, and the synchronous pulley III12 is fixed to the main shaft 7 by interference fit or keyway-key fit. The interference fit or keyway fit can prevent slippage between the synchronous pulley and the wheel axle, ensure efficient power transmission, and prevent idling that could lead to failure of the salvage component.

[0035] Please see Figure 1 The main shaft 7 is hollow and filled with foam material. On the one hand, it greatly reduces the weight of the main shaft 7 and reduces the burden of holding the whole device. On the other hand, the buoyancy of the foam can keep the salvage component floating on the surface of the waste pool, avoiding the inability to accurately salvage foreign objects on the water surface due to gravity sinking. At the same time, the hollow structure does not affect the mechanical strength of the main shaft 7, taking into account both portability and reliability.

[0036] Please see Figure 1 Synchronous pulleys II4, III12, and IV16 have the same diameter, while synchronous pulley I2 has twice the diameter of synchronous pulley II4. This design allows the main shaft 7 to rotate at twice its speed when the crank handle 18 is turned. When the operator turns the crank handle 18, the subsequent components can rotate smoothly without applying excessive force, reducing operator fatigue. At the same time, the speed reduction transmission can prevent the foreign object from falling off due to excessive speed of the retrieval components.

[0037] Please see Figure 1 One side of the fine wire mesh I6 is provided with an end cap II8, and the end cap II8 has a threaded hole 9 in the middle. The end cap II8 is fixed to one end of the main shaft 7 by screws 10 that engage with the threaded hole 9. One side of the fine wire mesh II14 is provided with an end cap IV15. The end cap IV15 is fixed to the main shaft 7 in the same way as the end cap II8. The end caps II8 and IV15 are fixed by screws 10 that engage with the threaded hole 9 of the main shaft. As the fixed end of the wire mesh on the side away from the pole, the detachable nature of the threaded connection facilitates subsequent maintenance, and the screw 10 connection has strong reliability and is not easy to loosen in the radiation environment, ensuring structural stability during the salvage process.

[0038] The working principle of a handheld foreign object retrieval device for a nuclear power plant's spent waste pool is as follows: First, the device is attached to a safety belt using a fall arrestor ring 19 to prevent it from falling into the spent waste pool. Then, the retrieval part of the device is lowered into the spent waste pool by holding the rod 1. Because the main shaft 7 is filled with highly buoyant foam material, half of the fine wire mesh I6 and the fine wire mesh II14 are always above the surface and half are below the surface. Then, the operator turns the crank handle 18 clockwise with their other hand. The crank handle 18 directly drives the synchronous pulley I2 to rotate synchronously. The synchronous pulley I2 drives the synchronous pulley II4 at one end of the axle 17 to rotate via the synchronous belt I3. The axle 17 passes through the rod 1 via a bearing. Synchronous pulley IV16 at one end rotates synchronously with axle 17, and transmits power to synchronous pulley III12 on main shaft 7 via synchronous belt II11, driving main shaft 7 to rotate smoothly, which in turn drives fine wire mesh I6 and fine wire mesh II14 to rotate. At this time, foreign objects on the surface of the wastewater pool will be collected into the spiral wire mesh. As the salvage work continues, the wire mesh continues to rotate, and foreign objects will gradually concentrate in the depth of the wire mesh, preventing foreign objects from escaping from the wire mesh. After the salvage work is completed, fine wire mesh I6 and fine wire mesh II14 can be straightened and unfolded to remove foreign objects adhering to their surfaces. After cleaning, the wire mesh can be rolled into a spiral shape for multiple uses.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A handheld foreign object retrieval device for the spent fuel pool surface in a nuclear power plant, characterized in that: Includes main components, power transmission components, and salvage components; The main component includes a power transmission component for fixing the axial middle position and a retrieval component at the axial bottom position (1); The power transmission assembly includes a synchronous pulley I (2), a main shaft (7), and a wheel axle (17). The synchronous pulley I (2) is mounted on one side of the rod body (1). The wheel axle (17) passes through the rod body (1) through a bearing. Synchronous pulley II (4) and synchronous pulley IV (16) are fixedly installed at both ends of the wheel axle (17). The synchronous pulley I (2) and synchronous pulley II (4) are connected by a synchronous belt I (3). The main shaft (7) is located at the bottom axial position of the rod body (1) and passes through the rod body (1) through a bearing. The two ends of the main shaft (7) extend out of both sides of the rod body (1). Synchronous pulley III (12) is fixedly installed on the main shaft (7). The synchronous pulley III (12) and synchronous pulley IV (16) are connected by a synchronous belt II (11). The salvage assembly includes end cap I (5), end cap III (13), fine wire mesh I (6), and fine wire mesh II (14) welded to the main shaft (7). End cap I (5) and end cap III (13) are symmetrically distributed along the axis of the rod (1). Fine wire mesh I (6) is located on the side of end cap I (5) away from the rod (1), and fine wire mesh II (14) is located on the side of end cap III (13) away from the rod (1).

2. The handheld foreign object retrieval device for spent water surface in a nuclear power plant according to claim 1, characterized in that: The main component also includes a fall arrestor ring (19) that is fixed to the top of the rod (1) by welding.

3. The handheld foreign object retrieval device for spent water surface in a nuclear power plant according to claim 1, characterized in that: The power transmission assembly also includes a crank handle (18), which passes through the rod body (1) through a bearing and is connected to the synchronous wheel I (2) on one side wall.

4. A handheld foreign object retrieval device for spent water surface in a nuclear power plant according to claim 3, characterized in that: The synchronous pulley I (2) is fixed to the crank handle (18), the synchronous pulley II (4) and the synchronous pulley IV (16) are fixed to the wheel axle (17), and the synchronous pulley III (12) is fixed to the main shaft (7) by interference fit or keyway and key fit.

5. A handheld foreign object retrieval device for spent water surface in a nuclear power plant according to claim 1, characterized in that: The interior of the main shaft (7) is hollow and filled with foam material.

6. A handheld foreign object retrieval device for spent water surface in a nuclear power plant according to claim 1, characterized in that: Synchronous pulleys II (4), III (12), and IV (16) have the same diameter, and the diameter of synchronous pulley I (2) is twice that of synchronous pulley II (4).

7. A handheld foreign object retrieval device for spent water surface in a nuclear power plant according to claim 1, characterized in that: Both the fine wire mesh I (6) and the fine wire mesh II (14) are spiral-shaped.

8. A handheld foreign object retrieval device for spent water surface in a nuclear power plant according to claim 1, characterized in that: One side of the fine wire mesh I (6) is provided with an end cap II (8), and the end cap II (8) is provided with a threaded hole (9) in the middle. The end cap II (8) is fixed to one end of the main shaft (7) by screws (10) cooperating with the threaded hole (9). One side of the fine wire mesh II (14) is provided with an end cap IV (15), and the end cap IV (15) is fixed to the main shaft (7) in the same way as the end cap II (8).

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