Target handling system and target handling method

Abstract

This invention discloses a target loading and unloading system and method. The target loading and unloading system includes: a conveying pipe, a dummy target chain, a target loading assembly, a target traction assembly, and a target unloading assembly. The sidewall of the conveying pipe is provided with loading ports, a first interface, and a second interface spaced apart along the axial direction of the conveying pipe. The dummy target chain is located inside the conveying pipe. The target loading assembly is connected to the conveying pipe and configured to drive the dummy target chain during loading to pull the dummy target chain. The target traction assembly is connected to the first interface and also drively connected to the chain body of the dummy target chain to pull the dummy target chain. The target unloading assembly is connected to the second interface and configured to drive the dummy target chain during unloading to pull the dummy target chain. This target loading and unloading system and method can meet the requirements for loading and unloading targets during the production of isotopes in high-temperature gas-cooled reactors.

Description

Technical Field

[0001] This invention relates to the field of nuclear reactor engineering technology, and in particular to a target loading and unloading system and method. Background Technology

[0002] High-temperature gas-cooled reactors are advanced nuclear energy systems with good safety characteristics. In addition to power generation, one of their important applications is the production of radioactive isotopes using the powerful neutron field inside the reactor.

[0003] To overcome the drawbacks of offline irradiation, the industry has proposed "online irradiation," which involves inserting a target into the reactor core for irradiation and removing it after irradiation, without opening the main pressure vessel during normal reactor operation. However, for online irradiation, a crucial technical challenge remains: how to reliably and accurately deliver and remove the target from the neutron source channels located in the high-radiation, high-temperature environment of the reactor core without compromising the integrity of the reactor pressure boundary, the physical state of the core, or its safe operation. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, in a first aspect, embodiments of the present invention provide a target loading and unloading system, the target loading and unloading system comprising: a conveying pipe, one end of which is connected to a neutron source channel, the sidewall of which is provided with a loading port, a first interface, and a second interface spaced apart along the axial direction of the conveying pipe; a dummy target chain located inside the conveying pipe, one end of which is connected to a real target chain; a target loading assembly connected to the other end of the conveying pipe, the target loading assembly being configured to be drivenly connected to the other end of the dummy target chain during loading operations to pull the dummy target chain; a target traction assembly connected to the first interface, the target traction assembly being drivenly connected to the chain body of the dummy target chain to pull the dummy target chain; and a target unloading assembly connected to the second interface, the target unloading assembly being configured to be drivenly connected to the other end of the dummy target chain during unloading operations to pull the dummy target chain.

[0006] In the target loading and unloading system of this invention embodiment, the real target chain can enter the conveying pipe through the loading port, thereby connecting with the dummy target chain. The target loading component can collect the real target chain by pulling the dummy target chain. The target traction component operates, which can drive the real target chain to be conveyed towards the neutron source channel. Here, the presence of the dummy target chain compensates for the insufficient conveying distance of the target traction component, ensuring that the real target chain can fall completely into the neutron source channel. After the real target chain is in place, the connection between the target loading component and the dummy target chain is released. The target unloading component connects to the free end of the dummy target chain and is then started, which can pull the real target chain out from the neutron source channel to complete the unloading.

[0007] This target loading and unloading system enables the delivery of targets into and from the reactor core under online irradiation conditions, meeting the requirements for loading and unloading targets during the production of isotopes in high-temperature gas-cooled reactors.

[0008] In some embodiments, the target loading assembly includes: a vortex coil connected to the delivery pipe; a first traction rope passing through the vortex coil, one end of which is detachably connected to the dummy target chain; and a first traction component connected to the first traction rope, configured to retract or release the first traction rope during operation.

[0009] In some embodiments, the target traction assembly includes: a straight tube communicating with the first interface; a second traction rope passing through the straight tube, one end of the second traction rope being disposed on the dummy target chain; and a second traction component being drively connected to the second traction rope, the second traction component being configured to retract or release the second traction rope during operation.

[0010] In some embodiments, the target unloading assembly includes: a spiral coil communicating with the second interface; a third traction rope passing through the spiral coil, one end of which is detachably connected to the dummy target chain; and a third traction component drivingly connected to the third traction rope, the third traction component being configured to retract or release the third traction rope during operation.

[0011] In some embodiments, the first traction component, the second traction component, and the third traction component have the same structure, including: a mounting shell; a roller located inside the mounting shell, on which a corresponding first traction rope, second traction rope, or third traction rope is wound, and both ends of the roller are rotatably engaged with the mounting shell; and a driving member disposed in the mounting shell, which is drively connected to the roller to drive the roller to rotate about its own axis.

[0012] In some embodiments, the drive component includes: a servo motor; a reducer, the input shaft of which is connected to the output shaft of the servo motor; and a magnetic synchronizer, the outer magnetic rotor of which is connected to the output shaft of the reducer via a coupling, and the inner magnetic rotor of which is connected to the roller.

[0013] In some embodiments, the first traction rope, the second traction rope, and the third traction rope are all steel wire ropes.

[0014] In some embodiments, the loading port, the first interface, and the second interface are distributed sequentially along the direction from one end of the conveying pipe to the other end of the conveying pipe.

[0015] Secondly, embodiments of the present invention propose a target loading and unloading method, which is based on the target loading and unloading system described above. The target loading and unloading method includes the following steps: Retrieving the target: inserting a real target chain into the conveying pipe through the loading port, activating the target loading assembly, and retracting the real target chain into the vortex coil; Ventilation: closing the loading port, replacing the air atmosphere in the conveying pipe and the vortex coil with a helium atmosphere, and then opening the isolation valve on the pipe connecting the conveying pipe and the neutron source channel; Loading the target: activating the target traction assembly, pulling the real target chain out of the vortex coil until the real target chain can fall towards the neutron source channel under its own gravity; Disconnecting the target: after the real target chain is in place, disconnecting the target loading assembly from the dummy target chain, and then activating the target loading assembly to retract the first traction rope of the target loading assembly.

[0016] In some embodiments, the target loading and unloading method further includes the following steps: reconnection, connecting the third traction rope of the target unloading assembly to the dummy target chain; unloading, activating the target unloading assembly to pull the irradiated real target chain out from the neutron source channel and collect it into the spiral coil. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the target loading and unloading system according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the traction component according to an embodiment of the present invention; Figure 3 yes Figure 2 A sectional view; Figures 4 to 9 This is a schematic diagram of the loading and unloading process of the target loading and unloading system according to an embodiment of the present invention.

[0019] Figure label: 10. Mounting housing; 20. Roller; 30. Drive unit; 31. Servo motor; 32. Reducer; 33. Magnetic synchronizer; 34. Coupling; 100. Conveying pipe; 110. Loading port; 120. First interface; 130. Second interface; 200. Dummy target chain; 300. Real target chain; 400, Target loading assembly; 410, Vortex coil; 420, First traction rope; 430, First traction component; 500. Target traction assembly; 510. Straight pipe; 520. Second traction rope; 530. Second traction component; 600, Target unloading assembly; 610, Spiral coil; 620, Third traction rope; 630, Third traction component. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figures 1 to 4 As shown, the target loading and unloading system of this embodiment includes: a conveying pipe 100, a dummy target chain 200, a target loading assembly 400, a target traction assembly 500, and a target unloading assembly 600; one end of the conveying pipe 100 is used to communicate with a neutron source channel, and the side wall of the conveying pipe 100 is provided with loading ports 110, a first interface 120, and a second interface 130 distributed at intervals along the axial direction of the conveying pipe 100; the dummy target chain 200 is located inside the conveying pipe 100, and one end of the dummy target chain 200 is used to connect with a real target chain 300; the target loading assembly 400... The target loading assembly 400 is connected to the other end of the conveying pipe 100. Under the loading condition, the target loading assembly 400 is driven to the other end of the dummy target chain 200 to pull the dummy target chain 200. The target traction assembly 500 is connected to the first interface 120 and is driven to the chain body of the dummy target chain 200 to pull the dummy target chain 200. The target unloading assembly 600 is connected to the second interface 130 and is configured to be driven to the other end of the dummy target chain 200 under the unloading condition to pull the dummy target chain 200.

[0022] In the target loading and unloading system of this embodiment, the real target chain 300 can enter the conveying pipe 100 through the loading port 110, thereby connecting with the dummy target chain 200. The target loading assembly 400 can collect the real target chain 300 by pulling the dummy target chain 200. The target traction assembly 500 can drive the real target chain 300 to be conveyed into the neutron source channel. Here, the presence of the dummy target chain 200 compensates for the insufficient conveying distance of the target traction assembly 500, ensuring that the real target chain 300 can fall completely into the neutron source channel. After the real target chain 300 is in place, the connection between the target loading assembly 400 and the dummy target chain 200 is released. The target unloading assembly 600 is connected to the free end of the dummy target chain 200 and then started, which can pull the real target chain 300 out of the neutron source channel to complete the unloading.

[0023] This target loading and unloading system enables the delivery of targets into and from the reactor core under online irradiation conditions, meeting the requirements for loading and unloading targets during the production of isotopes in high-temperature gas-cooled reactors.

[0024] The following combination Figures 1 to 9 The structure and shape of the target loading and unloading system according to an embodiment of the present invention will be described in detail below: In some embodiments, reference is made to Figure 1 and Figure 4 The target loading assembly 400 includes: a vortex coil 410, a first traction rope 420, and a first traction component 430; the vortex coil 410 is connected to the conveying pipe 100; the first traction rope 420 passes through the vortex coil 410, and one end of the first traction rope 420 is detachably connected to the dummy target chain 200; the first traction component 430 is drive-connected to the first traction rope 420, and the first traction component 430 is configured to retract or release the first traction rope 420 during operation.

[0025] refer to Figure 1 The vortex coil 410 is connected to the conveying pipe 100, providing space for the temporary storage of the target chain. At the same time, the vortex coil 410 can be adapted to a longer target chain, thereby saving space. The first traction component 430 cooperates with the first traction rope 420 to pull the target chain in a narrow channel, thereby realizing the conveying of the target chain.

[0026] refer to Figure 4 and Figure 5 At the loading port 110, the real target chain 300 can be connected to the dummy target chain 200. The first traction component 430 retracts the first traction rope 420, which will drive the real target chain 300 to move through the dummy target chain 200, and pull the real target chain 300 into the vortex coil 410 to complete the retrieval. The first traction component 430 releases the first traction rope 420, and at the same time cooperates with the target traction assembly 500, the real target chain 300 can be pulled out of the vortex coil 410 to be transported to the neutron source channel.

[0027] In some embodiments, reference is made to Figure 1 and Figure 4 The target traction assembly 500 includes: a straight pipe 510, a second traction rope 520, and a second traction component 530; the straight pipe 510 is connected to the first interface 120; the second traction rope 520 passes through the straight pipe 510, and one end of the second traction rope 520 is located on the dummy target chain 200; the second traction component 530 is connected to the second traction rope 520 in a transmission manner, and the second traction component 530 is configured to retract or release the second traction rope 520 during operation.

[0028] refer to Figure 1 The design of the straight tube 510 facilitates the passage of the second traction rope 520. The second traction component 530 cooperates with the second traction rope 520 to pull the target chain and pull the target chain out from the vortex coil 410.

[0029] refer to Figure 5 and Figure 6 The second traction component 530 retracts the second traction rope 520, which pulls the real target chain 300 out of the vortex coil 410 through the dummy target chain 200 and transports the real target chain 300 into the neutron source channel. As the second traction rope 520 continues to pull, before the end of the second traction rope 520 connected to the dummy target chain 200 reaches the first interface 120, part of the real target chain 300 will leave the delivery pipe 100. At this time, the weight of part of the real target chain 300 and the tension of the second traction rope 520 will act simultaneously, driving the entire real target chain 300 and the dummy target chain 200 to continue to be transported. In this way, even if the second traction rope 520 cannot provide the transport tension, the real target chain 300 can still be positioned, that is, enter the neutron source channel and complete the loading.

[0030] It should be added here that a limiting structure is provided between the dummy target chain 200 and the conveying pipe 100. That is, after the real target chain 300 reaches the designated position, the limiting structure will restrict the real target chain 300 from sliding further downward. The limiting structure includes an annular platform formed on the inner wall of the conveying pipe 100 and a frustum on the dummy target chain 200. It can be understood that the diameter of the frustum is larger than the inner diameter of the annular platform. Thus, during the conveying of the real target chain 300, the frustum and the annular platform come into contact, indicating that the real target chain 300 has been conveyed to the designated position.

[0031] In some embodiments, reference is made to Figure 1 and Figure 7The target unloading assembly 600 includes: a spiral coil 610, a third traction rope 620, and a third traction component 630; the spiral coil 610 is connected to the second interface 130; the third traction rope 620 passes through the spiral coil 610, and one end of the third traction rope 620 is detachably connected to the dummy target chain 200; the third traction component 630 is drive-connected to the third traction rope 620, and the third traction component 630 is configured to retract or release the third traction rope 620 during operation.

[0032] refer to Figure 1 The spiral coil 610 is connected to the delivery pipe 100, providing space for the temporary storage of the target chain. At the same time, the spiral coil 610 can be adapted to a longer target chain, thereby saving space. The third traction component 630 cooperates with the third traction rope 620 to pull the target chain out from the neutron source channel.

[0033] refer to Figures 7 to 9 The third traction component 630 retracts the third traction rope 620, which pulls the real target chain 300 out of the neutron source channel through the dummy target chain 200. With the continuous pulling of the third traction rope 620, the real target chain 300 is drawn into the spiral coil 610. Through the reversing mechanism, the spiral coil 610 is connected to the shielding container. At this time, the third traction component 630 releases the third traction rope 620, and the real target chain 300 falls into the shielding container under gravity, completing the storage. It should be noted that the reversing mechanism is an existing structure; for details, please refer to patent application number 202022996177.5, entitled "A Sliding Diverter Applied to a Piece Bed Type High-Temperature Gas-Cooled Reactor."

[0034] In some embodiments, reference is made to Figures 1 to 3 The first traction component 430, the second traction component 530, and the third traction component 630 have the same structure, including: a mounting shell 10, a roller 20, and a drive component 30; the roller 20 is located inside the mounting shell 10, and a corresponding first traction rope 420, second traction rope 520, or third traction rope 620 is wound on the roller 20, and both ends of the roller 20 are rotatably engaged with the mounting shell 10; the drive component 30 is located in the mounting shell 10, and the drive component 30 is connected to the roller 20 in a transmission manner to drive the roller 20 to rotate around its own axis.

[0035] Specifically, in combination Figure 2 and Figure 3 As shown, the side wall of the mounting housing 10 is provided with a through hole, which is connected to a corresponding pipe, such as a vortex coil 410, a straight pipe 510, or a spiral coil 610; the corresponding first traction rope 420, second traction rope 520, or third traction rope 620 is wound around the drum 20, one end of the rope is fixed to the drum 20, and the other end passes through the through hole into the corresponding pipe; the two ends of the drum 20 are rotatably engaged with the mounting housing 10 through bearings.

[0036] When the drive unit 30 is activated, the roller 20 will rotate around its own axis to retract or release the traction rope, and the retraction or release of the traction rope will drive the target chain to move.

[0037] Optionally, the first traction rope 420, the second traction rope 520, and the third traction rope 620 are all steel wire ropes. Steel wire ropes can withstand repeated bending and straightening, thus adapting to curved conveyor channels and smoothly moving the target chain to the target position.

[0038] Optionally, refer to Figure 2 The drive unit 30 includes: a servo motor 31, a reducer 32, and a magnetic synchronizer 33; the input shaft of the reducer 32 is connected to the output shaft of the servo motor 31; the outer magnetic rotor of the magnetic synchronizer 33 is connected to the output shaft of the reducer 32 through a coupling 34, and the inner magnetic rotor of the magnetic synchronizer 33 is connected to the roller 20.

[0039] When the servo motor 31 starts, the torque is transmitted sequentially to the drum 20 via the reducer 32, coupling 34, and magnetic synchronizer 33. The drum 20 rotates around its own axis, releasing or retracting the wire rope, thus moving the target chain. Here, the servo motor 31, reducer 32, coupling 34, and magnetic synchronizer 33 are used as a power source to achieve contactless, sealed transmission, effectively avoiding the risk of radioactive leakage at the mounting housing 10. In addition, high-precision control of the drum 20 can be achieved, ensuring that the target chain is delivered to the correct position.

[0040] In some embodiments, reference is made to Figure 1 and Figure 5 Along the direction from one end of the conveying pipe 100 to the other end, the loading port 110, the first interface 120, and the second interface 130 are distributed in sequence.

[0041] It is understandable that from one end of the delivery pipe 100 used to connect to the neutron source channel to the other end of the delivery pipe 100, the loading port 110, the target traction assembly 500, the target unloading assembly 600 and the target loading assembly 400 will be distributed in sequence, with a reasonable layout, which ensures the smooth loading and unloading of the real target chain 300.

[0042] The target loading and unloading method of this invention, based on any of the target loading and unloading systems described above, includes the following steps: For the target assembly, load the actual target chain 300 into the delivery pipe 100 through the loading port 110, and start the target loading assembly 400 to retract the actual target chain 300 into the vortex coil 410. For the air exchange, close the loading port 110 and replace the air atmosphere in the delivery pipe 100 and the vortex coil 410 with a helium atmosphere. Then, open the isolation valve on the pipe connecting the delivery pipe 100 and the neutron source channel. For the target loading, start the target traction assembly 500 to pull the actual target chain 300 out of the vortex coil 410 until the actual target chain 300 can fall into the neutron source channel under its own gravity. For the disconnection, after the actual target chain 300 is in place, release the target loading. The component 400 is connected to the dummy target chain 200, and then the target loading component 400 is activated to retract the first traction rope 420 of the target loading component 400; then it is reconnected by connecting the third traction rope 620 of the target unloading component 600 to the dummy target chain 200; unloading is performed by activating the target unloading component 600 to pull the irradiated real target chain 300 out of the neutron source channel and into the spiral coil 610; storage is performed by connecting the spiral coil 610 to the shielding container through the reversing mechanism. At this time, the third traction component 630 releases the third traction rope 620, and the real target chains 300 fall into the shielding container under the action of gravity and are loaded into the shielding container one by one.

[0043] This target loading and unloading method enables online loading and unloading of targets during isotope production in high-temperature gas-cooled reactors, improving target production efficiency.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A target loading and unloading system, characterized in that, include: A delivery pipe (100) is provided, one end of which is used to communicate with a neutron source channel. The side wall of the delivery pipe (100) is provided with a loading port (110), a first interface (120) and a second interface (130) distributed at intervals along the axial direction of the delivery pipe (100). A dummy target chain (200) is located inside the delivery pipe (100), and one end of the dummy target chain (200) is used to connect with the real target chain (300). A target loading assembly (400) is connected to the other end of the conveying pipe (100). The target loading assembly (400) is configured to be connected to the other end of the dummy target chain (200) in the loading condition to pull the dummy target chain (200). A target traction assembly (500) is connected to the first interface (120) and is connected to the chain body of the dummy target chain (200) to pull the dummy target chain (200). A target unloading assembly (600) is connected to the second interface (130). The target unloading assembly (600) is configured to drively connect to the other end of the dummy target chain (200) during unloading to pull the dummy target chain (200).

2. The target loading and unloading system according to claim 1, characterized in that, The target loading assembly (400) includes: A vortex coil (410) is connected to the delivery pipe (100); A first traction rope (420) is threaded through the vortex coil (410), and one end of the first traction rope (420) is detachably connected to the dummy target chain (200). A first traction component (430) is connected to the first traction rope (420) in a transmission manner, and the first traction component (430) is configured to retract or release the first traction rope (420) during operation.

3. The target loading and unloading system according to claim 2, characterized in that, The target traction assembly (500) includes: A straight pipe (510) is connected to the first interface (120); The second traction rope (520) is threaded through the straight pipe (510), and one end of the second traction rope (520) is attached to the dummy target chain (200). A second traction component (530) is drivenly connected to the second traction rope (520) and is configured to retract or release the second traction rope (520) during operation.

4. The target loading and unloading system according to claim 3, characterized in that, The target unloading assembly (600) includes: A spiral coil (610) is connected to the second interface (130); A third traction rope (620) is threaded through the spiral coil (610), and one end of the third traction rope (620) is detachably connected to the dummy target chain (200). A third traction component (630) is connected to the third traction rope (620) in a transmission manner, and the third traction component (630) is configured to retract or release the third traction rope (620) during operation.

5. The target loading and unloading system according to claim 4, characterized in that, The first traction component (430), the second traction component (530), and the third traction component (630) have the same structure, including: Mounting housing (10); A roller (20) is located inside the mounting shell (10). The roller (20) is wound with a corresponding first traction rope (420), second traction rope (520) or third traction rope (620). Both ends of the roller (20) are rotatably engaged with the mounting shell (10). A drive member (30) is disposed on the mounting shell (10) and is connected to the roller (20) for driving the roller (20) to rotate around its own axis.

6. The target loading and unloading system according to claim 5, characterized in that, The driving element (30) includes: Servo motor (31); A speed reducer (32), the input shaft of which is connected to the output shaft of the servo motor (31); The magnetic synchronizer (33) has an outer magnetic rotor connected to the output shaft of the reducer (32) via a coupling (34), and an inner magnetic rotor connected to the drum (20).

7. The target loading and unloading system according to claim 4, characterized in that, The first traction rope (420), the second traction rope (520) and the third traction rope (620) are all steel wire ropes.

8. The target loading and unloading system according to claim 1, characterized in that, Along the direction from one end of the conveying pipe (100) to the other end of the conveying pipe (100), the loading port (110), the first interface (120) and the second interface (130) are distributed in sequence.

9. A method for loading and unloading a target, characterized in that, Based on the target loading and unloading system as described in any one of claims 1 to 8, the system includes the following steps: Take out the target chain (300) and load it into the conveying pipe (100) through the loading port (110). Start the target loading assembly (400) to collect the target chain (300) into the vortex coil (410). Ventilation is performed by closing the loading port (110) and replacing the air atmosphere in the conveying pipe (100) and the vortex coil (410) with a helium atmosphere. Then, the isolation valve on the pipe connecting the conveying pipe (100) and the neutron source channel is opened. The device is installed, and the target traction assembly (500) is activated to pull the real target chain (300) out of the vortex coil (410) until the real target chain (300) can fall into the neutron source channel under its own gravity. After the real target chain (300) is in place, disconnect the target loading assembly (400) from the dummy target chain (200), then start the target loading assembly (400) and retract the first traction rope (420) of the target loading assembly (400).

10. The target loading and unloading method according to claim 9, characterized in that, The target loading and unloading method also includes the following steps: Reconnect the third traction rope (620) of the target unloading assembly (600) to the dummy target chain (200); To unload the target, the target unloading assembly (600) is activated to pull the irradiated real target chain (300) out of the neutron source channel and into the spiral coil (610).

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