Welding device for nuclear fuel cladding tube and end plug

Abstract

The invention discloses a welding device for a nuclear fuel cladding tube and an end plug, the welding device comprises a reflecting part and an emitting part, the reflecting part is provided with an annular reflecting surface capable of reflecting light beams, and the annular reflecting surface is arranged around an annular welding seam in the circumferential direction; in the axial direction corresponding to the circumferential direction, the emitting part is located on one side of the reflecting part; the emitting part can emit conical light beams, and the conical light beams are reflected by the annular reflecting face and then irradiate all the positions, arranged in the circumferential direction, of the annular weld joint at the same time. According to the invention, the conical light beams are emitted along the same conical surface, and after being reflected by the annular reflecting surface, the conical light beams can cover the annular welding seam along 360 degrees, so that all the positions of the welding seam along the circumferential direction are irradiated and heated at the same time and welding is realized, and therefore, all the positions of the welding seam along the circumferential direction are heated more uniformly, and the sealing performance of the welding seam is stronger.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and more particularly to a welding apparatus for nuclear fuel cladding tubes and end plugs. Background Technology

[0002] The fuel cladding tube is a critical structural component in a nuclear reactor, used to safely encapsulate nuclear fuel, prevent the leakage of radioactive materials, and ensure the stable operation of fuel elements under extreme conditions. The fuel cladding tube must be welded to the end plug 360° circumferentially to ensure sealing and structural integrity.

[0003] In related technologies, there are problems such as uneven welding and low weld sealing between nuclear fuel cladding tubes and end plugs. Summary of the Invention

[0004] To overcome the problems existing in the prior art, this application provides a welding apparatus for a nuclear fuel cladding tube and an end plug, wherein an annular weld is formed between the nuclear fuel cladding tube and the end plug, and the welding apparatus includes: A reflector having an annular reflective surface capable of reflecting a light beam, the reflective surface being arranged around the annular weld along the circumference of the annular weld. The emitter is located on one side of the reflector along an axial direction corresponding to the circumferential direction; the emitter is capable of emitting a conical beam of light, which, after being reflected by the annular reflective surface, simultaneously illuminates all positions of the annular weld along the circumferential direction.

[0005] The present invention has at least the following beneficial effects: The conical beam is emitted along the same conical surface. After being reflected by the annular reflector, the beam can cover the annular weld 360°, so that all positions of the weld along the circumference are simultaneously irradiated, heated and welded. This makes the heating of the weld along the circumference more uniform and the sealing of the weld stronger.

[0006] According to some embodiments of this application, the annular weld has a first annular region and a second annular region arranged along the axial direction; The annular reflective surface has a first ring portion and a second ring portion arranged along the axial direction; The transmitter is capable of simultaneously emitting a first conical beam and a second conical beam, wherein the cone angle of the first conical beam is smaller than the cone angle of the second conical beam; The first conical beam is reflected by the first ring portion and then illuminates the first annular region; the second conical beam is reflected by the second ring portion and then illuminates the second annular region.

[0007] According to some embodiments of this application, the annular reflective surface has a straight line segment as the cross-section of the axial section.

[0008] According to some embodiments of this application, the annular reflective surface has a first ring portion and a second ring portion arranged along the axial direction; The transmitter is capable of simultaneously emitting a first conical beam and a second conical beam, wherein the cone angle of the first conical beam is smaller than the cone angle of the second conical beam; The first conical beam is reflected along the first optical path at the first ring portion, and the second conical beam is reflected along the second optical path at the second ring portion. The first conical beam and the second conical beam respectively irradiate the same annular area of ​​the annular weld along the first optical path and the second optical path.

[0009] According to some embodiments of this application, the annular reflective surface is curved at the axial section.

[0010] According to some embodiments of this application, the reflector is arranged in a ring shape, and the ring-shaped reflective surface is disposed on the inner circumferential surface of the reflector; the ring-shaped reflective surface has a first end away from the emitter and a second end facing the emitter, and the minimum distance from the ring-shaped reflective surface to the central axis of the nuclear fuel cladding tube gradually increases along the direction from the first end to the second end.

[0011] According to some embodiments of this application, it also includes: A clamping mechanism for clamping the nuclear fuel cladding tube; A force-applying rod is used to apply a force toward the nuclear fuel cladding tube to the end plug, and the clamping mechanism and the force-applying rod are located on opposite sides of the reflector along the axial direction.

[0012] According to some embodiments of this application, the force-applying rod includes a fixed section and a sliding section. The fixed section is fixedly disposed, and the sliding section is slidably connected to the fixed section. An elastic element is also provided between the sliding section and the fixed section, and the elastic element is used to provide a force to the sliding section in the direction toward the end plug.

[0013] According to some embodiments of this application, the emitting element includes a light source and a conical lens arranged along the axial direction, the conical lens having an incident surface and an exit surface opposite each other along the axial direction, the exit surface being arranged in a conical shape; The light beam emitted by the light source passes through the incident surface into the conical lens and exits through the exit surface to form the conical light beam.

[0014] According to some embodiments of this application, the emitting element further includes a light-shielding plate and a light source, the light-shielding plate being located between the light source and the reflector along the axial direction; the light-shielding plate is capable of blocking part of the light beam emitted by the light source and forming a dark area on the side of the light-shielding plate opposite to the light source; the force-adding rod is disposed in the dark area.

[0015] According to some embodiments of this application, the clamping mechanism includes a fixed base and a clamping member. The fixed base is provided with a slide rail along the axial direction. The clamping member is used to clamp the nuclear fuel cladding tube, and the clamping member can slide relative to the fixed base along the slide rail to adjust the magnitude of the force between the nuclear fuel cladding tube and the end plug.

[0016] According to some embodiments of this application, the clamping mechanism further includes a pressure sensor, a control chip, and a driver; The pressure sensor is used to obtain the magnitude of the force along the axial direction between the clamping member and the fixing seat; The driver is used to drive the clamp to slide along the slide rail; The control chip can preset a first limit value and a second limit value. When the value obtained by the pressure sensor is less than the first limit value, the control chip issues a first command, and the driver responds to the first command and drives the clamping member to move along the nuclear fuel cladding tube toward the end plug until the value obtained by the pressure sensor is greater than the first limit value. When the value obtained by the pressure sensor is greater than the second limit value, the control chip issues a second command, and the driver responds to the second command and drives the clamping member to move along the nuclear fuel cladding tube away from the end plug until the value obtained by the pressure sensor is less than the second limit value.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the welding device in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the force-applying rod in an embodiment of the present invention; Figure 3 This is a schematic diagram of the transmitter in an embodiment of the present invention; Figure label: 100. Reflector; 110. Annular reflector; 200. Emitter; 210. Light source; 220. Conical lens; 230. Conical beam; 240. Shielding plate; 250. Dark area; 300. Nuclear fuel cladding tube; 310. End plug; 400. Fixing base; 410. Clamping component; 500. Force rod; 510. Sleeve; 520. Sliding section; 530. Fixing section; 540. Elastic component. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are 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 limiting this invention.

[0021] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the 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.

[0024] First, it must be noted that the welding process for nuclear reactor components (such as the welding of nuclear fuel cladding tubes to end plugs) places extremely high demands on the uniformity and sealing of the welds. This is especially true when the weld is a closed, annular shape. Uneven heating during welding or poor sealing in an annular weld can easily lead to the leakage of nuclear fuel and other substances, triggering a highly dangerous accident.

[0025] Based on this, please refer to Figure 1 and Figure 3 A welding apparatus is provided for a nuclear fuel cladding tube and an end plug, wherein a circumferentially extending annular weld is formed between the nuclear fuel cladding tube and the end plug. The welding apparatus includes a reflector 100 and an emitter 200. The reflector 100 has an annular reflective surface 110 capable of reflecting a light beam, and the annular reflective surface 110 is arranged circumferentially around the annular weld. Along an axial direction corresponding to the circumferential direction, the emitter 200 is located on one side of the reflector 100. The emitter 200 is capable of emitting a conical light beam 230, which, after being reflected by the annular reflective surface 110, simultaneously irradiates all positions of the annular weld arranged circumferentially. Exemplarily, the conical light beam 230 may specifically be a laser used for welding, and the laser beam diverges along the same conical surface to the annular reflective surface 110.

[0026] Specifically, the conical beam 230 irradiates the annular weld after being reflected by the annular reflector 110. Since the conical beam 230 is emitted along the same conical surface, after being reflected by the annular reflector 110, it can cover the annular weld 360°, so that all positions of the weld along the circumference are simultaneously irradiated, heated, and welded. This makes the heating of all positions of the weld along the circumference more uniform and the sealing performance of the weld stronger.

[0027] According to some embodiments of this application, the annular weld has a first annular region and a second annular region arranged along the axial direction; the annular reflective surface 110 has a straight line segment in the axial section; and the annular reflective surface 110 has a first annular portion and a second annular portion arranged along the axial direction; the emitting element 200 is capable of simultaneously emitting a first conical beam and a second conical beam, and the cone angle of the first conical beam is smaller than the cone angle of the second conical beam; wherein, the first conical beam is reflected by the first annular portion and then irradiates the first annular region; and the second conical beam is reflected by the second annular portion and then irradiates the second annular region.

[0028] Understandably, a first conical beam with a smaller cone angle illuminates the first ring portion and, after reflection from the first ring portion, illuminates the first annular region. A second conical beam with a larger cone angle illuminates the second ring portion and, after reflection from the second ring portion, illuminates the second annular region. By emitting conical beams 230 with different cone angles, ultimately illuminating different positions along the axial direction of the annular weld, multiple conical beams 230 can cover the entire area of ​​the annular weld along the axial direction, ensuring that all positions of the annular weld along both the axial and circumferential directions are simultaneously heated and welded. This results in more uniform heating of the weld along both the circumferential and axial directions, stronger weld sealing, and suitability for applications with wider welds.

[0029] According to other embodiments of this application, the annular reflective surface 110 has a curved cross-section along its axial direction, and the annular reflective surface 110 has a first ring portion and a second ring portion arranged along the axial direction; the emitting element 200 can simultaneously emit a first conical beam and a second conical beam, and the cone angle of the first conical beam is smaller than that of the second conical beam; wherein, the first conical beam is reflected along a first optical path at the first ring portion, and the second conical beam is reflected along a second optical path at the second ring portion, and the first conical beam and the second conical beam are respectively irradiated onto the same annular area of ​​the annular weld along the first optical path and the second optical path. Specifically, the first conical beam with a smaller cone angle is reflected by the first ring portion, and the second conical beam with a larger cone angle is reflected by the second ring portion, and both are simultaneously irradiated onto the same annular area of ​​the annular weld, so that multiple conical beams 230 with different cone angles can be focused on the same area of ​​the annular weld, thereby improving welding efficiency and being suitable for applications with small weld widths.

[0030] For example, the conical beam 230 has a central axis, which in this embodiment is parallel to the axial direction of the nuclear fuel cladding tube. The cone angle of the conical beam 230 may specifically be the angle between the conical surface where the beam is located and the central axis.

[0031] Please refer to Figure 1According to some embodiments of this application, the reflector 100 is arranged in a ring shape, and the ring-shaped reflective surface 110 is disposed on the inner circumferential surface of the reflector 100. The ring-shaped reflective surface 110 has a first end facing away from the emitter 200 and a second end facing the emitter 200. The minimum distance from the ring-shaped reflective surface 110 to the central axis of the nuclear fuel cladding tube gradually increases from the first end to the second end. Specifically, the reflector 100 is generally ring-shaped, and the ring-shaped reflective surface 110 is disposed on its inner circumferential surface. This structure allows the ring-shaped reflective surface 110 to be arranged circumferentially around the annular weld. The first end of the ring-shaped reflective surface 110 faces away from the emitter 200, and the second end faces the emitter 200. From the first end to the second end, the minimum distance from the ring-shaped reflective surface 110 to the central axis of the nuclear fuel cladding tube gradually increases. This design ensures that the conical beam 230 emitted by the transmitter 200 can accurately and evenly irradiate all positions of the annular weld after reflection when it irradiates different positions of the annular reflector 110, thereby further improving the welding quality and weld sealing performance.

[0032] Please refer to Figures 1-3 According to some embodiments of this application, the welding apparatus further includes a clamping mechanism and a force-applying rod 500, which are respectively located on opposite sides of the reflector 100 along the axial direction. The clamping mechanism is used to clamp the nuclear fuel cladding tube 300, and the force-applying rod 500 is used to apply a force toward the nuclear fuel cladding tube 300 to the end plug 310. The clamping mechanism and the force-applying rod 500 are respectively located on opposite sides of the reflector 100 along the axial direction.

[0033] Specifically, the clamping mechanism clamps the nuclear fuel cladding tube 300, and the end plug 310 is inserted into one end of the nuclear fuel cladding tube 300, so that the annular weld formed between the nuclear fuel cladding tube 300 and the end plug 310 is located inside the reflector 100. The end plug 310 is held in place by the force-adding rod 500 to ensure that the end plug 310 does not fall off the nuclear fuel cladding tube 300. After preparation, the emitter 200 emits a conical beam 230, which, after being reflected by the annular reflector 110, irradiates the annular weld formed between the nuclear fuel cladding tube 300 and the end plug 310, so that all parts of the annular weld are simultaneously heated and melted, thereby enhancing the weld quality and improving the sealing of the weld between the nuclear fuel cladding tube 300 and the end plug 310.

[0034] Please refer to Figure 2 According to some embodiments of this application, the force bar 500 includes a fixed section 530 and a sliding section 520. The fixed section 530 is fixedly disposed, and the sliding section 520 is slidably connected to the fixed section 530. An elastic element 540 is also provided between the sliding section 520 and the fixed section 530. The elastic element 540 is used to provide a force to the sliding section 520 in the direction toward the end plug 310.

[0035] Specifically, the force-applying rod 500 also includes a sleeve 510, with a fixed section 530 fixedly disposed in the sleeve 510 and a sliding section 520 slidably disposed in the sleeve 510. The elastic element 540 can be specifically configured as a helical spring or other elastic component, with one end connected to the sliding section 520 and the other end connected to the fixed section 530. When the end of the sliding section 520 facing away from the fixed section 530 abuts against the end plug 310, the elastic element 540 is in a compressed state, providing a continuous pushing force that causes the sliding section 520 to push against the end plug 310. This not only prevents the end plug 310 from falling off the port of the nuclear fuel cladding tube 300 during welding, but also maintains a continuous thrust on the end plug 310 when the weld seam is heated, causing axial displacement of the end plug 310, thus preventing the weld width between the end plug 310 and the nuclear fuel cladding tube 300 from expanding. This improves welding quality and enhances the sealing performance of the weld seam.

[0036] According to some other embodiments of this application, the fixed section 530 can also move axially relative to the sleeve 510 and be driven by a driving member. By sliding the fixed section 530 relative to the sleeve 510, the compression amount of the elastic member 540 can be adjusted, thereby adjusting the axial force between the end plug 310 and the nuclear fuel cladding tube 300.

[0037] Please refer to Figure 3 According to some embodiments of this application, the emitting element 200 includes a light source 210, a conical lens 220, and a light-shielding plate 240 arranged axially. The conical lens 220 has an incident surface and an exit surface opposite each other axially, and the exit surface is conical. The light beam emitted by the light source 210 passes through the incident surface into the conical lens 220 and exits through the exit surface to form a conical light beam 230. The light-shielding plate 240 is located axially between the light source 210 and the reflector 100. The light-shielding plate 240 can block part of the light beam emitted by the light source 210 and forms a dark area 250 on the side of the light-shielding plate 240 away from the light source 210. The force-adding rod 500 is disposed in the dark area 250.

[0038] Specifically, the light source 210 emits multiple parallel beams of light. These beams pass through the incident surface into the conical lens 220, and then exit through the exit surface, undergoing refraction. This alters the propagation angle of the beams, causing them to diffuse outward along the same conical surface, thus forming a conical beam 230. Simultaneously, a portion of the beams exiting the exit surface is blocked by the light-shielding plate 240, creating a dark area 250 on the back of the light-shielding plate 240. Placing the force-adding rod 500 within this dark area 250 prevents interference between the force-adding rod 500 and the welding beam, avoids damage to the force-adding rod 500, and / or uneven heating at the weld.

[0039] Please refer to Figure 1According to some embodiments of this application, the clamping mechanism includes a fixed base 400 and a clamping member 410. The fixed base 400 is provided with a slide rail along the axial direction. The clamping member 410 is used to clamp the nuclear fuel cladding tube 300, and the clamping member 410 can slide relative to the fixed base 400 along the slide rail to adjust the magnitude of the force between the nuclear fuel cladding tube 300 and the end plug 310.

[0040] Specifically, the clamping mechanism also includes a pressure sensor, a control chip, and a driver. The pressure sensor is used to acquire the magnitude of the axial force between the clamping member 410 and the fixed base 400. The driver is used to drive the clamping member 410 to slide along the slide rail. The control chip can preset a first limit value and a second limit value. When the value acquired by the pressure sensor is less than the first limit value, the control chip issues a first command, and the driver responds to the first command and drives the clamping member 410 to move along the nuclear fuel cladding tube 300 toward the end plug 310 until the value acquired by the pressure sensor is greater than the first limit value. When the value acquired by the pressure sensor is greater than the second limit value, the control chip issues a second command, and the driver responds to the second command and drives the clamping member 410 to move along the nuclear fuel cladding tube 300 away from the end plug 310 until the value acquired by the pressure sensor is less than the second limit value. This design ensures that the axial force between the nuclear fuel cladding tube 300 and the end plug 310 is always within the range between the first and second limit values, ensuring that the axial stress of the weld fluctuates within an acceptable range and improving the welding quality.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A welding apparatus for a nuclear fuel cladding tube and an end plug, an annular weld being formed between the nuclear fuel cladding tube and the end plug, characterized by, The welding device comprises: a reflecting member provided with a ring-shaped reflecting surface capable of reflecting a light beam, the reflecting surface being arranged around the annular weld along a circumferential direction of the annular weld; a emitting member arranged on one side of the reflecting member along an axial direction corresponding to the circumferential direction, the emitting member being capable of emitting a conical light beam, the conical light beam being capable of simultaneously irradiating all positions of the annular weld along the circumferential direction after being reflected by the ring-shaped reflecting surface.

2. The apparatus for welding of nuclear fuel cladding tubes to end plugs according to claim 1, characterized in that, The annular weld has a first annular region and a second annular region arranged along the axial direction; The ring-shaped reflecting surface has a first ring portion and a second ring portion arranged along the axial direction; The emitting member is capable of simultaneously emitting a first conical light beam and a second conical light beam, and the cone angle of the first conical light beam is smaller than that of the second conical light beam; The first conical light beam is irradiated to the first annular region after being reflected by the first ring portion, and the second conical light beam is irradiated to the second annular region after being reflected by the second ring portion.

3. The apparatus for welding of nuclear fuel cladding tubes to end plugs according to claim 2, characterized in that, The cross-section of the ring-shaped reflecting surface along the axial direction is a straight line segment.

4. The apparatus for welding of nuclear fuel cladding tubes with end plugs according to claim 1, characterized in that, The ring-shaped reflecting surface has a first ring portion and a second ring portion arranged along the axial direction; The emitting member is capable of simultaneously emitting a first conical light beam and a second conical light beam, and the cone angle of the first conical light beam is smaller than that of the second conical light beam; The first conical light beam is reflected along a first light path at the first ring portion, and the second conical light beam is reflected along a second light path at the second ring portion, and the first conical light beam and the second conical light beam are irradiated to the same annular region of the annular weld along the first light path and the second light path, respectively.

5. The apparatus for welding of nuclear fuel cladding tubes to end plugs according to claim 4, characterized in that, The cross-section of the ring-shaped reflecting surface along the axial direction is a curve.

6. The apparatus for welding of nuclear fuel cladding tubes with end plugs of claim 1, wherein, The reflecting member is arranged in a ring shape, and the ring-shaped reflecting surface is arranged on an inner circumferential surface of the reflecting member; the ring-shaped reflecting surface has a first end facing away from the emitting member and a second end facing toward the emitting member, and the minimum distance of the ring-shaped reflecting surface to the central axis of the nuclear fuel cladding tube gradually increases along a direction from the first end toward the second end.

7. The apparatus for welding of nuclear fuel cladding tubes with end plugs of claim 1, wherein, Further comprising: a clamping mechanism for clamping the nuclear fuel cladding tube; a force applying rod for applying a force to the end plug toward the nuclear fuel cladding tube, the clamping mechanism and the force applying rod being respectively arranged on opposite sides of the reflecting member along the axial direction.

8. The apparatus for welding of nuclear fuel cladding tubes to end plugs according to claim 7, characterized in that, The force applying rod comprises a fixed segment and a sliding segment, the fixed segment being fixedly arranged, the sliding segment being slidably connected with the fixed segment, and an elastic member being further arranged between the sliding segment and the fixed segment, the elastic member being used to provide a force to the sliding segment along a direction toward the end plug.

9. The apparatus for welding of nuclear fuel cladding tubes with end plugs of claim 1, wherein, The emitting member comprises a light source and a conical lens arranged along the axial direction, the conical lens having an incident surface and an exit surface opposite to each other along the axial direction, and the exit surface being arranged in a conical shape; The light beam emitted by the light source is transmitted into the conical lens through the incident surface and is transmitted out of the conical lens through the exit surface to form the conical light beam.

10. The apparatus for welding of nuclear fuel cladding tubes with end plugs of claim 7, wherein, The light emitting member further comprises a light shield and a light source, the light shield is located between the light source and the reflecting member along the axial direction; the light shield can shield part of the light beam emitted by the light source and form a dark area on the side of the light shield away from the light source; the force applying rod is arranged in the dark area.

11. The apparatus for welding of nuclear fuel cladding tubes with end plugs of claim 7, wherein, The clamping mechanism comprises a fixed seat and a clamping piece, the fixed seat is provided with a sliding rail along the axial direction, the clamping piece is used to clamp the nuclear fuel cladding tube, and the clamping piece can slide along the sliding rail relative to the fixed seat to adjust the acting force between the nuclear fuel cladding tube and the end plug.

12. The apparatus for welding of nuclear fuel cladding tubes to end plugs of claim 11, wherein, The clamping mechanism further comprises a pressure sensor, a control chip and a driver; The pressure sensor is used to obtain the acting force between the clamping piece and the fixed seat along the axial direction; The driver is used to drive the clamping piece to slide along the sliding rail; The control chip can preset a first limit value and a second limit value, when the value obtained by the pressure sensor is less than the first limit value, the control chip sends a first instruction, the driver responds to the first instruction and drives the clamping piece to move along the nuclear fuel cladding tube towards the end plug until the value obtained by the pressure sensor is greater than the first limit value; when the value obtained by the pressure sensor is greater than the second limit value, the control chip sends a second instruction, the driver responds to the second instruction and drives the clamping piece to move along the nuclear fuel cladding tube away from the end plug until the value obtained by the pressure sensor is less than the second limit value.

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