Target component

Abstract

The invention discloses a target piece assembly, and belongs to the technical field of nuclear reactor cores, the target piece assembly comprises a first end plug, a clamping pipe, a second end plug, a connecting pipe, a third end plug and a target rod, the first end plug is used for being connected with a pressing system, the first end plug is movably connected with the clamping pipe, a limiting piece is arranged in the connecting pipe, and the second end plug is movably connected with the third end plug. The limiting piece can move in the axial direction to be connected with the first end plug so that the first end plug can be connected with the clamping pipe, and the limiting piece can move in the axial direction to be separated from the first end plug so that the first end plug can be detachably connected with the clamping pipe. The first end plug and the clamping pipe are detachably connected, locking and unlocking are achieved through a mechanical clamping structure, mounting and dismounting are convenient, structural parts such as a pressing system can be reused, the cost of the radiation target piece is reduced, generation of radioactive waste is reduced, and the radiation target piece is suitable for popularization and application. And meanwhile, chippings and falling parts are not generated in the underwater dismounting process of the target component, and water in a spent fuel pool is not influenced.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear reactor cores, and in particular to a target component. Background Art

[0002] Irradiation targets are mainly used for the production of radioactive isotopes. They are similar in structure to fixed-type related components and are mainly composed of a clamping system, a target rod, nuts and pins. When entering the reactor for irradiation, the irradiation target replaces the position of the fixed-type related components, and the target material in the target rod produces radioactive isotopes after irradiation in the nuclear reactor.

[0003] At present, the target rod is usually installed on the clamping system through a nut, and the nut is fixed to the target rod by spot welding with a pin to prevent loosening. When the target rod is disassembled, the pin and nut need to be destroyed, or the target rod can be directly cut off with a cutting tool. After the target rod is disassembled, the clamping system and other structural parts cannot be reused, which increases the amount of radioactive waste. In addition, during the underwater disassembly of the target rod, debris and parts may enter the spent fuel pool uncontrollably, causing pollution to the water quality of the pool. The present invention proposes a new solution to the above problems. Summary of the invention

[0004] In order to overcome at least one of the above disadvantages, the present invention provides a target assembly. The purpose of the present invention can be achieved by adopting the following technical solution:

[0005] The present invention provides a target component, comprising a first end plug, a locking tube, a second end plug, a connecting tube, a third end plug and a target rod which are sequentially connected along the axial direction, wherein the first end plug is used to be connected to a clamping system, the first end plug and the locking tube are movably connected, a limiting member is provided inside the connecting tube, the limiting member can be moved along the axial direction to be connected to the first end plug so that the first end plug is connected to the locking tube position, and the limiting member can be moved along the axial direction to be separated from the first end plug so that the first end plug and the locking tube are detachably connected.

[0006] In one possible implementation manner, a portion of the first end plug is located inside the locking tube and is detachably connected to the locking tube, one end of the locking tube is fixedly connected to the first end of the second end plug, the second end of the second end plug is fixedly connected to the first end of the connecting tube, the second end of the connecting tube is fixedly connected to the first end of the third end plug, and the second end of the third end plug is fixedly connected to the target rod.

[0007] In one possible implementation manner, when the locking tube is rotated circumferentially to an unlocking position, the locking tube is located in an edge region of the slide slot, so that the locking connector can move along the slide slot;

[0008] When the locking tube is rotated to a locking position along the circumferential direction, a portion of the locking joint is located outside the edge area of ​​the sliding groove, so that the locking joint cannot move along the sliding groove.

[0009] In one embodiment, the first end plug comprises a first rod body, one end of the first rod body is provided with a connecting structure for connecting with the clamping system, the other end of the first rod body is provided with a rod member along the axial direction, and the end of the rod member away from the first rod body is provided with a snap joint, and a part of the snap joint protrudes from the outer edge contour of the rod member;

[0010] The second end plug includes a pipe fitting, in which a stepped hole is axially opened, and the stepped hole includes a coaxially arranged slide groove and a clamping groove, the inner diameter of the clamping groove is larger than the inner diameter of the slide groove, and a step surface for abutting against the snap joint is formed at the connection between the slide groove and the clamping groove.

[0011] In one possible implementation manner, when the snap joint rotates along its own circumference to a preset angle, the snap joint is located in the edge area of ​​the slide groove, so that the snap joint can move along the slide groove;

[0012] When the engaging joint rotates along its own circumference to a non-preset angle, a portion of the engaging joint is located outside the edge area of ​​the sliding groove, so that the engaging joint cannot move along the sliding groove.

[0013] In one embodiment, an elastic member is provided between the limit member and the third end plug, and the elastic member applies an elastic force to the limit member to move in the direction of the first end plug, so that a portion of the limit member can contact the first end plug and form a stop for the circumferential movement of the first end plug.

[0014] In one possible implementation manner, the limiting member includes a slider, which is located in the inner cavity of the connecting tube, a locking rod is provided at one end of the slider, a through groove is axially opened in the second end plug for the locking rod to pass through, and a limiting groove is provided on the locking joint of the first end plug, and a part of the locking rod can be embedded in the limiting groove to form a stop for the circumferential movement of the first end plug.

[0015] In one possible implementation manner, the elastic member includes a compression spring whose deformation direction is arranged axially along the connecting pipe, a first end of the compression spring abuts against the limiting member, and a second end of the compression spring abuts against the third end plug.

[0016] In one embodiment, the slider is provided with a first groove, the connecting pipe includes a sleeve and a second groove provided on the sleeve, the first groove and the second groove are relatively staggered in the axial direction, and the end of the first groove away from the first end plug is located within the edge area of ​​the second groove.

[0017] In one possible implementation manner, the third end plug comprises a third rod body, the third rod body is provided with a third slot, and the first slot, the second slot and the third slot are arranged along the same axis.

[0018] Beneficial technical effects of the present invention: According to the content of the present disclosure, the target assembly includes a first end plug, a locking tube, a second end plug, a connecting tube, a third end plug and a target rod, which is connected to the clamping system through the first end plug. The first end plug and the clamping tube are detachably connected, and locking and unlocking are achieved through a mechanical locking structure, which is convenient for installation and disassembly, so that structural parts such as the clamping system can be reused, reducing the cost of radiation targets and the generation of radioactive waste. At the same time, the underwater disassembly process of the target assembly will not generate debris and dropped parts, and will not affect the water quality of the spent fuel pool. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In the accompanying drawings, the following are given by way of example and not limitation:

[0020] Figure 1 A cross-sectional view of the overall structure is shown;

[0021] Figure 2 shows a schematic structural diagram of a first end plug;

[0022] Figure 3 A cross-sectional view of the structure of the clamping tube at one angle is shown;

[0023] Figure 4 A structural cross-sectional view of the clamping tube at another angle is shown;

[0024] Figure 5 A cross-sectional view of the structure of the second end plug at an angle is shown;

[0025] Figure 6 A structural cross-sectional view of the second end plug at another angle is shown;

[0026] Figure 7 A schematic diagram of the structure of the limiter is shown;

[0027] Figure 8 A schematic diagram of the structure of the connecting pipe is shown;

[0028] Fig. 9 A schematic structural diagram of the third end plug is shown.

[0029] In the figure:

[0030] 1. First end plug; 2. Clamping tube; 3. Second end plug; 4. Positioning member; 5. Elastic member; 6. Connecting tube; 7. Third end plug; 8. Target rod;

[0031] 11. first rod body; 12. connecting structure; 13. rod member; 14. snap-fit ​​joint; 15. limit groove; 21. pipe fitting; 22. slide groove; 23. snap groove; 24. step surface; 31. second rod body; 32. through groove; 33. first annular concave platform; 34. second annular concave platform; 41. snap-fit ​​rod; 42. slider; 43. first slot; 61. sleeve; 62. second slot; 71. third rod body; 72. third slot; 73. second annular concave platform; 74. fourth annular concave platform. DETAILED DESCRIPTION

[0032] In the following detailed disclosure, these embodiments are fully described with reference to the accompanying drawings. In order to make the technical scheme of the present invention more clear and specific to those skilled in the art, the implementation methods described below are not limited to this. The present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings.

[0033] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0035] like Figure 1-Figure 9As shown, the present invention provides a target assembly, comprising a first end plug 1, a locking tube 2, a second end plug 3, a connecting tube 6, a third end plug 7 and a target rod 8 which are sequentially connected along the axial direction, wherein the first end plug 1 is used to be connected to a clamping system, and the first end plug 1 and the locking tube 2 are movably connected, and a limiting member 4 is provided inside the connecting tube 6, and the limiting member 4 can be moved along the axial direction to be connected to the first end plug 1 so that the first end plug 1 and the locking tube 2 are connected in position, and the limiting member 4 can be moved along the axial direction to be separated from the first end plug 1 so that the first end plug 1 and the locking tube 2 are detachably connected.

[0036] The target assembly comprises a first end plug 1, a clamping tube 2, a second end plug 3, a connecting tube 6, a third end plug 7 and a target rod 8, which is connected to the clamping system through the first end plug 1. The first end plug 1 and the clamping tube 2 are detachably connected, and locking and unlocking are achieved through a mechanical clamping structure, which is convenient for installation and disassembly, so that structural parts such as the clamping system can be reused, which not only reduces the cost of the radiation target, but also reduces the generation of radioactive waste. At the same time, the underwater disassembly process of the target assembly will not generate debris and dropped parts, and will not affect the water quality of the spent fuel pool.

[0037] Among them, the node for installation and disassembly is located between the first end plug 1 and the locking tube 2, and the locking and unlocking functions are realized by adjusting the position of the limit member 4. When the limit member 4 moves along the locking direction, it abuts against the first end plug 1 and forms a limit on the first end plug 1, so as to achieve the effect of relatively fixing the position of the first end plug 1 relative to the locking tube 2, and realizing that the locking tube 2 and the first end plug 1 are in a locked state; when the limit member 4 moves along the unlocking direction, it separates from the first end plug 1, and the first end plug 1 can move, so as to achieve the effect of relatively moving the position of the first end plug 1 relative to the locking tube 2, and realizing that the locking tube 2 and the first end plug 1 are in an unlocked state.

[0038] In one possible implementation, Figure 1 As shown, a portion of the first end plug 1 is located inside the locking tube 2 and is detachably connected to the locking tube 2, one end of the locking tube 2 is fixedly connected to the first end of the second end plug 3, the second end of the second end plug 3 is fixedly connected to the first end of the connecting tube 6, the second end of the connecting tube 6 is fixedly connected to the first end of the third end plug 7, and the second end of the third end plug 7 is fixedly connected to the target rod 8.

[0039] Among them, Figure 5 As shown, the first end of the second end plug 3 has a first annular recess 33, the locking tube 2 is sleeved on the first annular recess 33, the second end of the second end plug 3 has a second annular recess 73, the connecting tube 6 is sleeved on the second annular recess 73, and the second end plug 3 and the locking tube 2 can be welded, and the second end plug 3 and the connecting tube 6 can be welded.

[0040] Among them, Fig. 9As shown, the first end of the third end plug 7 has a third annular recess, the connecting tube 6 is sleeved on the third annular recess, the second end of the third end plug 7 has a fourth annular recess 74, the target rod 8 is sleeved on the fourth annular recess 74, and the third end plug 7 and the connecting tube 6 can be welded, and the third end plug 7 and the target rod 8 can be welded.

[0041] The outer diameters of the engaging tube 2, the second end plug 3, the connecting tube 6, the third end plug 7 and the target rod 8 may be approximately consistent for installation and use.

[0042] The target rod 8 comprises a cladding, a target box, a spacer, a lower end plug and other structural components.

[0043] In one possible implementation, Figure 1-Figure 4 As shown, the working position of the locking tube 2 has a locking position and an unlocking position. When the locking tube 2 is in the locking position, the first end plug 1 forms a stopper for the locking tube 2 in the direction of axial movement. When the locking tube 2 is in the unlocking position, the locking tube 2 can move axially until it is separated from the first end plug 1.

[0044] It can be understood that, when the first end plug 1 and the locking tube 2 are connected, the locking tube 2 can rotate with its own axis as the rotation center, and there are a locking position and an unlocking position during the rotation of the locking tube 2. When the locking tube 2 is rotated to the locking position, the first end plug 1 forms a stopper for the locking tube 2 moving axially, and the locking tube 2 also forms a stopper for the first end plug 1 moving axially, keeping the positions of the locking tube 2 and the first end plug 1 relatively stable; when the locking tube 2 is rotated to the unlocking position aligned with the first end plug 1, the first end plug 1 does not form a stopper for the locking tube 2 moving axially, and the locking tube 2 can move axially away from the first end plug 1 and separate from the first end plug 1.

[0045] In one possible implementation, Figure 2-Figure 4 As shown, the first end plug 1 includes a first rod body 11, one end of the first rod body 11 is provided with a connecting structure 12 for connecting to a clamping system, the other end of the first rod body 11 is axially provided with a rod member 13, and the end of the rod member 13 away from the first rod body 11 is provided with a snap joint 14, and a part of the snap joint 14 protrudes from the outer edge contour of the rod member 13; the second end plug 3 includes a pipe fitting 21, and the pipe fitting 21 has an axially opened step hole, the step hole includes a coaxially arranged slide groove 22 and a snap groove 23, the inner diameter of the snap groove 23 is larger than the inner diameter of the slide groove 22, and a step surface 24 for abutting against the snap joint 14 is formed at the connection between the slide groove 22 and the snap groove 23.

[0046] The outer diameter of the first rod body 11 is greater than the outer diameter of the rod member 13 , and the outer diameter of the rod member 13 is smaller than the inner diameter of the sliding groove 22 .

[0047] Among them, the snap-fit ​​joint 14 includes a long side and a short plate, and the cross-sectional shape of the slide groove 22 is also adapted to the snap-fit ​​joint 14. When the snap-fit ​​joint 14 is located inside the slide groove 22, the two are matched with a small gap. The width of the long side of the snap-fit ​​joint 14 is greater than the width of the short side of the slide groove 22, and the width of the long side of the snap-fit ​​joint 14 is less than the inner diameter of the slot 23.

[0048] Among them, when the locking joint 14 is located in the locking groove 23, the locking tube 2 can rotate along the circumferential direction to realize the position switching between the locked position and the unlocked position, and the locking joint 14 is pushed to abut against the step surface 24 through the limit member 4, thereby limiting the rotation of the locking tube 2, keeping the positions of the locking tube 2 and the first end plug 1 relatively fixed, and improving stability.

[0049] The first rod body 11 is a cylindrical structure, the rod member 13 is a small-diameter cylindrical section, and the snap-fit ​​joint 14 is a groove-shaped section.

[0050] In one possible implementation, Figure 2-Figure 4 As shown, when the locking tube 2 rotates along its own circumference to the unlocking position, the locking joint 14 is located in the edge area of ​​the slide groove 22, so that the locking joint 14 can move along the slide groove 22; when the locking tube 2 rotates along its own circumference to the locking position, a part of the locking joint 14 is located outside the edge area of ​​the slide groove 22, so that the locking joint 14 cannot move along the slide groove 22.

[0051] When the locking tube 2 is rotated to the unlocking position aligned with the locking joint 14, the long side of the locking joint 14 is aligned with the long side of the slide groove 22, and the short side of the locking joint 14 is aligned with the short side of the slide groove 22. The locking joint 14 is completely located in the edge area of ​​the slide groove 22, so that the locking joint 14 can pass through the slide groove 22, thereby realizing the separation of the locking tube 2 from the first end plug 1 and disassembly.

[0052] When the locking tube 2 is rotated to a non-unlocking position offset from the locking joint 14, that is, when the locking tube 2 is rotated to a locking position, the long side of the locking joint 14 is offset from the long side of the slide groove 22, and the short side of the locking joint 14 is offset from the short side of the slide groove 22. A portion of the locking joint 14 is located outside the edge area of ​​the slide groove 22, so that the locking joint 14 cannot pass through the slide groove 22, thereby achieving locking of the position of the locking tube 2 and the first end plug 1.

[0053] In one possible implementation, Figure 1 As shown, an elastic member 5 is provided between the limit member 4 and the third end plug 7, and the elastic member 5 applies an elastic force to the limit member 4 to move in the direction of the first end plug 1, so that a part of the limit member 4 can contact the first end plug 1 and form a stop for the circumferential movement of the first end plug 1.

[0054] Among them, an elastic member 5 and a limiting member 4 are provided in the connecting tube 6, one end of the elastic member 5 is relatively fixed to the third end plug 7, and the other end of the elastic member 5 is in contact with the limiting member 4. The elastic member 5 applies elastic force to the limiting member 4 to move it toward the direction close to the first end plug 1. The elastic member 5 pushes the limiting member 4 to embed into the first end plug 1 to form a limit.

[0055] Among them, Figure 5-Figure 7 As shown, the limit member 4 includes a slider 42, which is located in the inner cavity of the connecting tube 6. A locking rod 41 is provided at one end of the slider 42. The second end plug 3 is axially provided with a through groove 32 for the locking rod 41 to pass through. A limit groove 15 is provided on the locking joint 14 of the first end plug 1. A part of the locking rod 41 can be embedded in the limit groove 15 to form a stop for the circumferential movement of the first end plug 1.

[0056] Among them, the cross-sectional shape of the through groove 32 is adapted to the cross-sectional shape of the locking rod 41, and the second end plug 3 forms a stopper for the locking rod 41 to move in the circumferential direction. The locking rod 41 can pass through the through groove 32 and move in the axial direction. Under the extrusion of the elastic member 5, the end of the locking rod 41 is embedded in the limiting groove 15 of the locking joint 14 to form a limit, so that the first end plug 1 and the locking rod 41 cannot be displaced in the circumferential direction, that is, the locking tube 2 cannot rotate in the circumferential direction and always remains in the locked position.

[0057] Among them, Figure 1 As shown, the elastic member 5 includes a compression spring whose deformation direction is axially arranged along the connecting pipe 6 , a first end of the compression spring abuts against the limiting member 4 , and a second end of the compression spring abuts against the third end plug 7 .

[0058] The elastic member 5 comprises a torsion spring, a first end of the torsion spring abuts against the limiting member 4 , and a second end of the torsion spring abuts against the third end plug 7 .

[0059] The elastic member 5 comprises an elastic sheet, a first end of the elastic sheet abuts against the limiting member 4 , and a second end of the elastic sheet abuts against the third end plug 7 .

[0060] In one possible implementation, Figure 1 , Figure 7 and Figure 8 As shown, a first slot 43 is provided on the slider 42, and the connecting pipe 6 includes a sleeve 61 and a second slot 62 provided on the sleeve 61. The first slot 43 and the second slot 62 are staggered relative to each other in the axial direction, and the end of the first slot 43 away from the first end plug 1 is located within the edge area of ​​the second slot 62.

[0061] Among them, when the limit member 4 is embedded in the first end plug 1, the first groove 43 and the second groove 62 are relatively staggered, and the end of the first groove 43 away from the first end plug 1 is located within the edge area of ​​the second groove 62, so that the position of the first groove 43 can be adjusted by the loading and unloading operation tool to drive the limit member 4 to move in the direction away from the first end plug 1 until it is separated from the first end plug 1.

[0062] The first slot 43 and the second slot 62 have a partial overlap portion, so as to accommodate the same loading and unloading operation tool.

[0063] Further, such as Figure 1 and Fig. 9 As shown, the third end plug 7 comprises a third rod body 71, on which a third slot 72 is provided, and the first slot 43, the second slot 62 and the third slot 72 are arranged along the same axis.

[0064] The third slot 72 is used to accommodate a loading and unloading operation tool.

[0065] Before the connection tube 6 and the third end plug 7 are assembled and welded, the stopper 4 and the elastic member 5 need to be assembled. The specific assembly process is as follows: first, the stopper 4 is installed, and the locking rod 41 is inserted into the through groove 32 of the second end plug 3; then the elastic member 5 is installed, and the upper end face of the elastic member 5 contacts the end face of the slider 42; finally, the third end plug 7 is pressed into the connection tube 6, and the lower end face of the elastic member 5 contacts the third end plug 7, and the elastic member 5 is in a compressed stress state. During assembly welding, the second slot 62 on the side of the connection tube 6 and the first slot 43 on the side of the slider 42 should be aligned. The lower end of the third end plug 7 is welded to the cladding tube of the target rod 8. During assembly welding, the third slot 72 on the side of the third end plug 7 and the second slot 62 on the side of the connection tube 6 should be aligned. The third slot 72 is used to accommodate loading and unloading operation tools. When the first end plug 1 is connected to the connecting pipe 6, the rod 13 and the snap-fit ​​joint 14 of the first end plug 1 are inserted into the step hole of the connecting pipe 6 until the snap-fit ​​joint 14 completely enters the slot 23; then the connecting pipe 6 is rotated horizontally to a locked position so that the snap-fit ​​joint 14 is limited and clamped by the step surface 24.

[0066] This embodiment provides a target assembly installation step, the installation step specifically includes:

[0067] S1. Use the first component and the second component of the loading and unloading operation tool to insert the first slot 43 of the stopper 4 and the third slot 72 of the third end plug 7 respectively, the second component of the loading and unloading operation tool remains stationary, and the first component of the loading and unloading operation tool compresses the elastic member 5 downward, so that the stopper 4 moves away from the first end plug 1;

[0068] S2. The first component, the second component and the target rod of the mobile loading and unloading operation tool are aligned with the through slot 32 of the connecting tube 6 and the engaging connector 14 of the first end plug 1, and then the top is moved to the horizontal direction and rotated to the locking position;

[0069] S3. The first component of the loading and unloading operation tool moves upward by unloading force, the limiting member 4 moves upward, and the engaging rod 41 is inserted into the limiting groove 15 of the first end plug 1 to limit the circumferential rotation of the engaging tube 2.

[0070] This embodiment provides a target assembly installation step, the installation step specifically includes:

[0071] S1. Use the first component and the second component of the loading and unloading operation tool to insert the first slot 43 of the stopper 4 and the third slot 72 of the third end plug 7 respectively, the second component of the loading and unloading operation tool remains stationary, and the first component of the loading and unloading operation tool compresses the elastic member 5 downward, so that the stopper 4 moves away from the first end plug 1;

[0072] S2. Move the first component, the second component and the locking tube 2 of the loading and unloading operation tool, rotate them horizontally to the unlocking position, and move them downward to remove the locking tube 2 from the first end plug 1.

[0073] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0075] In view of the above detailed description, these and other changes can be made to these embodiments, and this written description includes the best mode embodiments to disclose the present invention. The scope of the patent obtained by the present invention is defined by the claims, which are not limited by the present disclosure, and the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the scope disclosed by the present invention, according to the technical solution and its conception of the present invention, is equivalent to or changes, and all are within the protection scope of the present invention.

Claims

1. A target assembly, characterized in that: The invention comprises a first end plug (1), a locking tube (2), a second end plug (3), a connecting tube (6), a third end plug (7) and a target rod (8) which are connected in sequence along the axial direction. The first end plug (1) is used to be connected to a clamping system. The first end plug (1) and the locking tube (2) are movably connected. A limiting member (4) is provided inside the connecting tube (6). The limiting member (4) can be moved along the axial direction to be connected to the first end plug (1) so that the first end plug (1) and the locking tube (2) are connected in position. The limiting member (4) can be moved along the axial direction to be separated from the first end plug (1) so that the first end plug (1) and the locking tube (2) are detachably connected.

2. The target assembly according to claim 1, characterized in that: A portion of the first end plug (1) is located inside the locking tube (2) and is detachably connected to the locking tube (2); one end of the locking tube (2) is fixedly connected to the first end of the second end plug (3); the second end of the second end plug (3) is fixedly connected to the first end of the connecting tube (6); the second end of the connecting tube (6) is fixedly connected to the first end of the third end plug (7); and the second end of the third end plug (7) is fixedly connected to the target rod (8).

3. The target assembly according to claim 1, characterized in that: The working position of the locking tube (2) comprises a locking position and an unlocking position. When the locking tube (2) is in the locking position, the first end plug (1) forms a stopper for the locking tube (2) in the direction of axial movement. When the locking tube (2) is in the unlocking position, the locking tube (2) can move axially until it is separated from the first end plug (1).

4. The target assembly according to claim 3, characterized in that: The first end plug (1) comprises a first rod body (11), one end of the first rod body (11) is provided with a connecting structure (12) for connecting with the clamping system, the other end of the first rod body (11) is provided with a rod member (13) along the axial direction, and the end of the rod member (13) away from the first rod body (11) is provided with a snap-fit ​​joint (14), and a part of the snap-fit ​​joint (14) protrudes from the outer edge contour of the rod member (13); The second end plug (3) comprises a pipe fitting (21), a stepped hole is axially provided in the pipe fitting (21), the stepped hole comprises a coaxially arranged slide groove (22) and a clamping groove (23), the inner diameter of the clamping groove (23) is larger than the inner diameter of the slide groove (22), and a stepped surface (24) for abutting against the clamping joint (14) is formed at the connection between the slide groove (22) and the clamping groove (23).

5. The target assembly according to claim 4, characterized in that: When the locking tube (2) rotates in the circumferential direction to an unlocking position, the locking tube (2) is located in the edge area of ​​the sliding groove (22), so that the locking joint (14) can move along the sliding groove (22); When the locking tube (2) is rotated in the circumferential direction to a locking position, a portion of the locking joint (14) is located outside the edge area of ​​the slide groove (22), so that the locking joint (14) cannot move along the slide groove (22).

6. The target assembly according to any one of claims 1 to 5, characterized in that: An elastic member (5) is provided between the limiting member (4) and the third end plug (7), and the elastic member (5) applies an elastic force to the limiting member (4) to move in the direction of the first end plug (1), so that a part of the limiting member (4) can contact the first end plug (1) and form a stop for the circumferential movement of the first end plug (1).

7. The target assembly according to claim 6, characterized in that: The limiting member (4) comprises a slider (42), the slider (42) being located in the inner cavity of the connecting tube (6), a locking rod (41) being provided at one end of the slider (42), a through groove (32) being provided in the axial direction for the locking rod (41) to pass through, a limiting groove (15) being provided on the locking joint (14) of the first end plug (1), a part of the locking rod (41) being able to be embedded in the limiting groove (15) to form a stop for the first end plug (1) to move in the circumferential direction.

8. The target assembly according to claim 7, characterized in that: The elastic member (5) comprises a compression spring arranged axially along the connecting tube (6) in a deformation direction, the first end of the compression spring abuts against the limiting member (4), and the second end of the compression spring abuts against the third end plug (7).

9. The target assembly according to claim 7, characterized in that: The slider (42) is provided with a first slot (43), and the connecting pipe (6) comprises a sleeve (61) and a second slot (62) provided on the sleeve (61). The first slot (43) and the second slot (62) are staggered relative to each other in the axial direction, and the end of the first slot (43) away from the first end plug (1) is located within the edge area of ​​the second slot (62).

10. The target assembly according to claim 9, characterized in that: The third end plug (7) comprises a third rod body (71), a third slot (72) is provided on the third rod body (71), and the first slot (43), the second slot (62) and the third slot (72) are arranged along the same axis.

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