A fuel pellet assembly system

Abstract

The application provides a fuel pellet assembly system, which comprises longitudinally arranged pipe fitting units, plug pressing units and welding units, and realizes continuous assembly of fuel pellets. The plug pressing units have first positions and second positions. When the plug pressing units are located at the first positions, the cladding tubes are transmitted to the pipe fitting units to be assembled with the fuel pellets in the pipe fitting units to form fuel rods. When the plug pressing units are located at the second positions, the fuel rods are transmitted to the plug pressing units to form assemblies with end plugs. The welding units have third positions and fourth positions. When the welding units are located at the third positions, the assemblies are transmitted to the welding units from the plug pressing units. When the welding units are located at the fourth positions, the welding units complete welding of the assemblies. The fuel pellet assembly system provided by the application realizes continuous operation of pipe fitting, plug pressing and welding processes and is suitable for different types of pellets.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fuel rod manufacturing, and in particular, to a fuel pellet assembly system. BACKGROUND

[0002] The nuclear fuel assembly used in fast neutron reactor is MOX fuel assembly, which is composed of operating head, upper transition joint, lower transition joint, outer sleeve, fuel rod and grid plate. The fuel rod is composed of cladding tube, pellet and end plug, etc. Since the pellet is highly radioactive and highly contaminated, the manufacturing of the fuel rod needs to be carried out in a glove box to protect the safety of the operator

[0003] Patent CN103909331A proposes a device for automatic welding of cladding tube and end plug of nuclear fuel rod. The device for automatic welding of end plug of nuclear fuel rod is used for resistance welding of cladding tube and end plug in a welding chamber. The device for automatic welding of end plug of nuclear fuel rod comprises: a welding chamber for resistance welding of end plug and cladding tube; a cladding tube conveying part comprising a cladding tube clamp for holding the fixed cladding tube and a first servo motor for driving the cladding tube clamp to the horizontal direction, so as to horizontally convey the cladding tube to the welding chamber; an end plug welding electrode for holding the end plug supplied by an end plug supply device; an end plug conveying driving part for horizontally conveying the end plug held on the end plug welding electrode to the welding chamber; and a position control module for controlling the driving of the first servo motor and the end plug conveying driving part. The welding is completed by rapid and precise control of the end plug and the cladding tube. The patent only proposes an assembly system of the welding unit, and does not disclose a multi-process assembly system and steps.

[0004] Patent CN1742345A proposes to divide the sealed box into a plurality of consecutive compartments; to connect each compartment to its adjacent compartment for a sealed passage of the cladding tube, at least some of the passages should be aligned to allow the cladding tube to move along its longitudinal axis; to introduce the cladding tube to be loaded, open at the front end, into the first compartment via the sealed passage or the input port thereof; to drive the cladding tube axially between the consecutive compartments until its open end reaches the last compartment; to load the pellet and, if applicable, various structural components other than the stop spring into the cladding tube through its open end in the last compartment; when the loading is completed, to partially axially extract the cladding tube to transfer its open end to the previous compartment; in the previous compartment, at least to clean and, if possible, to perform a contamination check on the part of the cladding tube exposed to contamination by the pellet or by the atmosphere of the last compartment during the loading process; after the cleaning, to move the cladding tube axially so that its open end is located in another compartment. The patent mainly aims at the assembly of the cladding unit, and does not disclose a multi-process assembly system.

[0005] The above analysis shows that the existing scheme is usually only for a certain process, such as welding and cladding, and cannot realize continuous assembly. How to integrate multiple processes in the same system and control the material transportation between different processes to realize automatic assembly, improve assembly efficiency, and be suitable for different types of fuel rods is a difficult problem in nuclear fuel rod assembly.

[0006] In view of the above technical problems, the present application is proposed. SUMMARY

[0007] The main purpose of the present application is to provide a fuel pellet assembly system that can realize continuous assembly, improve production efficiency, and ensure operation safety.

[0008] In order to achieve the above purpose, the present application provides a fuel pellet assembly system, which comprises a longitudinally arranged pipe loading unit, a plug pressing unit, and a welding unit for continuous assembly of fuel pellets. The plug pressing unit has a first position and a second position. When the plug pressing unit is at the first position, the cladding tube is transported to the pipe loading unit and assembled with the fuel pellets in the pipe loading unit to form a fuel rod. When the plug pressing unit is at the second position, the fuel rod is transported to the plug pressing unit to form an assembly with the end plug. The welding unit has a third position and a fourth position. When the welding unit is at the third position, the assembly is transported from the plug pressing unit to the welding unit. When the welding unit is at the fourth horizontal position, the welding unit completes the welding of the assembly.

[0009] Further, the box body comprises a plurality of compartments arranged in sequence along the longitudinal direction and sealed from each other between adjacent compartments. The pipe loading unit, the plug pressing unit and the welding unit are respectively arranged corresponding to the plurality of compartments.

[0010] Further, the first longitudinal transmission mechanism is arranged in the same compartment as the plug pressing unit, and the first longitudinal transmission mechanism drives the cladding tube to move between adjacent compartments to complete the pipe loading and plug pressing processes.

[0011] Further, the second longitudinal transmission mechanism is arranged in the same compartment as the welding unit, and the second longitudinal transmission mechanism is coaxially distributed with the first longitudinal transmission mechanism. The cladding tube is driven by the first longitudinal transmission mechanism to the second longitudinal transmission mechanism to complete the welding process.

[0012] Further, the plug pressing unit comprises a first support that moves horizontally under the action of a driving device to realize position switching.

[0013] Further, the plug pressing unit comprises a plug pressing cavity integrated on the first support. When the plug pressing unit is at the second position, the first longitudinal transmission mechanism drives the fuel rod into the plug pressing cavity to combine with the end plug.

[0014] Further, the plug pressing cavity is provided with an opening, and the plug pressing cavity and the fuel rod are subjected to vacuum treatment through the opening.

[0015] Further, the pressing plug unit comprises a support rod integrated on the first support, the support rod is parallel to the pressing plug cavity and is kept a distance in the horizontal direction, the pressing plug unit is located at the first position, the support rod is coaxial with the cladding tube, and the cladding tube enters the pipe assembling unit along the support rod.

[0016] Further, the pressing plug unit further comprises a driving sensor integrated on the first support, the driving sensor is coaxial with the pressing plug cavity, and the driving sensor pushes the end plug into the pressing plug cavity and combines with the fuel rod.

[0017] Further, the pressing plug unit further comprises a weighing assembly connected to the support rod, and the weighing assembly is lifted together with the support rod to complete the weighing of the fuel rod.

[0018] Further, the welding unit comprises a welding cavity, and the welding unit is located at the fourth position, and the second longitudinal transmission mechanism transmits the assembly to the welding cavity.

[0019] Further, the welding unit further comprises a chuck connected to the assembly to drive the assembly to rotate.

[0020] The fuel pellet assembly system provided by the application has the following technical effects:

[0021] 1. The fuel pellet assembly system is provided with a pipe assembling unit, a pressing plug unit and a welding unit, so that continuous operation of multiple processes is realized, and the work efficiency is improved.

[0022] 2. The multiple units are integrated in different compartments in the box body, and the multiple compartments are sealed from each other, so that the pollution problem between different processes is avoided.

[0023] 3. The first longitudinal transmission mechanism and the second longitudinal transmission mechanism are arranged, and the continuous displacement of the fuel rod is realized by horizontally moving the pressing plug unit and the welding unit, so that the assembly efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings accompanying the specification of the application form a part of the application and serve to provide further understanding of the application, and the illustrative embodiments of the application and their descriptions serve to explain the application without constituting an improper limitation of the application. In the drawings:

[0025] Figure 1 A structure schematic diagram of the fuel pellet assembly system in the embodiment of the application is shown;

[0026] Figure 2 A top view schematic diagram of the fuel pellet assembly system in the embodiment of the application is shown;

[0027] Figure 3 A structure schematic diagram of the pressing plug unit in the embodiment of the application is shown;

[0028] Figure 4 A top view of a plug unit structure in the embodiments of the present application is shown;

[0029] Figure 5 A schematic view of a welding unit structure in the embodiments of the present application is shown;

[0030] Figure 6 A schematic view of a row length unit structure in the embodiments of the present application is shown;

[0031] Figure 7 A schematic view of a pipe loading unit structure in the embodiments of the present application is shown.

[0032] Among the above drawings, the following reference signs are included:

[0033] 10, row length unit; 11, vibration disc; 12, straight vibration; 13, row length guide plate; 14, first sensor; 15, stop lever; 16, tray; 20, pipe loading unit; 21, second sensor; 22, clamping jaw cylinder; 23, push rod mechanism; 24, support block; 30, plug unit; 31, first support; 32, plug cavity; 34, driving sensor; 36, support rod; 38, weighing assembly; 322, opening; 40, welding unit; 50, box body; 52, compartment; 51, glove hole; 53, sealing door; 55, air inflation sealing component; 60, first longitudinal transmission mechanism; 70, second longitudinal transmission mechanism; 42, welding cavity; 46, chuck. DETAILED DESCRIPTION

[0034] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] The present application will be described in further detail below in combination with specific embodiments, which cannot be understood as limiting the scope of the claimed present application. The term “comprising” indicates the presence of a feature, but does not exclude the presence or addition of one or more other features; the terms “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; in addition, the terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0036] In the description, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0037] Embodiment 1:

[0038] The present application provides a fuel pellet assembly system, as shown in the accompanying drawings Figure 1 The fuel pellet assembly system includes longitudinally arranged pipe loading unit 20, plug unit 30, welding unit 40, which continuously assembles the fuel pellet, improves the assembly efficiency.

[0039] The plug unit 30 has a first position and a second position, the plug unit 30 is located at the first position, the cladding tube is transmitted to the pipe loading unit 20 and assembled with the fuel pellet in the pipe loading unit 20 to form a fuel rod; the plug unit 30 is located at the second position, the fuel rod is transmitted to the plug unit 30 and forms an assembly with the end plug.

[0040] The welding unit 40 has a third position and a fourth position, the welding unit 40 is located at the third position, the assembly is transmitted from the plug unit 30 to the welding unit 40, the welding unit 40 is located at the fourth horizontal position, and the assembly is welded in the welding unit 40.

[0041] By horizontally moving the plug unit and the welding unit, the fuel rod is continuously displaced between different processes, and the material completed in the previous process can be directly moved to the next station, improving the assembly efficiency.

[0042] In an embodiment of the present application, the fuel pellet assembly system further comprises a box body 50, the box body 50 comprises a plurality of compartments 52, the plurality of compartments 52 are arranged in sequence along the longitudinal direction, and the adjacent compartments 52 are sealed from each other, the pipe loading unit 20, the plug unit 30 and the welding unit 40 are respectively arranged corresponding to the plurality of compartments 52. By arranging the pipe loading unit 20, the plug unit 30 and the welding unit 40 in different compartments respectively, different processes are completed in different space operations during assembly, avoiding material pollution. Preferably, the box body 50 is provided with a sealing door 53 and an air inflation sealing part 55 between the adjacent compartments, to ensure the sealing and independence of the compartment environment. In addition, the outer wall of each compartment of the box body 50 is provided with a glove hole 51.

[0043] In another embodiment of the present application, as shown in the accompanying drawings Figure 2As shown, the fuel pellet assembly system further comprises a first longitudinal transmission mechanism 60 arranged in the same compartment as the plug unit 30, which drives the cladding tube to move between adjacent compartments, completing the tube loading and plug pressing processes.

[0044] In addition, the fuel pellet assembly system further comprises a second longitudinal transmission mechanism 70 arranged in the same compartment as the welding unit 40, which is coaxially distributed with the first longitudinal transmission mechanism 60. The cladding tube is driven by the first longitudinal transmission mechanism 60 and then by the second longitudinal transmission mechanism 70, completing the welding process.

[0045] The plug unit 30 is horizontally moved to the first position, and the cladding tube is transmitted to the tube loading unit 20 under the action of the first longitudinal transmission mechanism 60, assembled with the fuel pellet in the tube loading unit 20, and a fuel rod is formed. The plug unit 30 is horizontally moved to the second position, and the fuel rod is returned to the position close to the plug unit 30 by the first longitudinal transmission mechanism 60, and the fuel rod and the end plug form an assembly. Subsequently, the welding unit 40 is moved to the third position, and the assembly is transmitted from the plug unit 30 to the welding unit 40 under the action of the second longitudinal transmission mechanism 70, and then the welding unit 40 is moved to the fourth horizontal position, and the assembly is moved to the welding unit 40 under the action of the second longitudinal transmission mechanism 70, completing the welding. Through the displacement cooperation of the plug unit 30, the welding unit 40, and the first longitudinal transmission mechanism 60 and the second longitudinal transmission mechanism 70, the continuous automatic operation of plug pressing and welding is realized, and the assembly efficiency is improved.

[0046] In an embodiment of the application, the accompanying drawings Figure 3 and the accompanying drawings Figure 4 As shown, the plug unit 30 is provided with a first support 31, which is horizontally moved under the action of a driving device, realizing the position switching of the plug unit 30.

[0047] In addition, the plug unit 30 comprises a plug cavity 32 integrated on the first support 31, which completes the assembly between the end plug and the fuel rod. The plug unit 30 is moved to the second position, and the fuel rod is driven into the plug cavity 32 by the first longitudinal transmission mechanism 60, combined with the end plug. Further, the first support 31 is further provided with a driving sensor 34, which is coaxial with the plug cavity 32. The driving sensor 34 pushes the end plug into the plug cavity 32, combined with the fuel rod. In this application, the plug cavity 32 is provided with an opening 322, through which the external vacuum system and gas source perform vacuumizing treatment on the plug cavity 32 and the fuel rod, and then nitrogen is introduced.

[0048] In addition, the plugging unit 30 also includes a support rod 36 integrated on the first bracket 31. The support rod 36 is parallel to the plugging cavity 32 and maintains a certain distance in the horizontal direction. The plugging unit 30 is located at the first position, and the support rod 36 is coaxial with the cladding tube. The cladding tube enters the compartment where the tube loading unit 20 is located along the support rod 36. Preferably, the support rod 36 is also provided with a support block to guide the fuel rod or cladding tube longitudinally and prevent the fuel rod or cladding tube from falling off.

[0049] Preferably, the plug unit 30 further includes a weighing component 38, which is connected to the support rod 36. The weighing component 38 includes a cylinder and a load cell. The cylinder drives the load cell and the support rod 36 to rise, detaching the fuel rod or cladding tube from other support blocks and supporting it only on the support block of the plug unit 30, thereby allowing the weight of the fuel rod or cladding tube to be measured.

[0050] In yet another embodiment of this application, as shown in the appendix Figure 5 As shown, the welding unit 40 includes a welding chamber 42. The welding unit 40 is located at the fourth position, and the second longitudinal transmission mechanism 70 transmits the assembly to the welding chamber 42. The welding unit 40 also includes a chuck 46, which is connected to the assembly and drives the assembly to rotate.

[0051] In addition, combined with the appendix Figure 1 As shown, the fuel pellet assembly system in this application also includes a lining unit 10, which arranges and trays the fuel pellets. After traying, the fuel pellets enter the tube assembly unit to complete the assembly with the casing tube.

[0052] The fuel pellet assembly system will be further described below with a specific embodiment.

[0053] The housing 50 is divided into four compartments 52: I, II, III, and IV. The rowing unit 10, the pipe mounting unit 20, the plugging unit 30, and the welding unit 40 are arranged in the four compartments respectively. The first longitudinal transmission mechanism 60 and the plugging unit 30 are both located in compartment III, and the second longitudinal transmission mechanism 70 and the welding unit 40 are located in compartment IV.

[0054] Each compartment of the housing 50 is equipped with a glove hole 51, and a sealing door 53 and an air-expanding sealing component 55 are provided between adjacent compartments.

[0055] The fuel pellets are arranged on the stacking unit and loaded onto a tray. The tray is transported from compartment I to compartment II through the sealing door 53 and placed on the loading unit 20. The cladding tube is placed on the first longitudinal transmission mechanism 60, which feeds the cladding tube longitudinally to the plugging unit 30. Before this, the plugging unit 30 is moved aside horizontally. The first longitudinal transmission mechanism 60 continues forward in the direction close to the loading unit 20 so that the cladding tube passes through the sealing door 53 and the air-expanding sealing component 55 to reach the loading unit 20. The loading unit 20 pushes the fuel pellets from the tray into the cladding tube, completing the loading and forming a fuel rod.

[0056] Subsequently, the first longitudinal transmission mechanism 60 retracts the cladding tube longitudinally into compartment III, and the plugging unit 30 moves horizontally to be coaxial with the first longitudinal transmission mechanism 60. The first longitudinal transmission mechanism 60 then feeds the cladding tube longitudinally into the plugging unit 30 and completes the helium filling and plugging actions to form the assembly.

[0057] The first longitudinal transfer mechanism 60 guides the assembly longitudinally through the air-expanding sealing component 55 and the sealing door 53 into the IV compartment. The second longitudinal transfer mechanism 70 receives the assembly and continues to advance it. Prior to this, the welding unit 40 has been horizontally moved aside. The welding unit 40 is then moved horizontally to be coaxial with the second longitudinal transfer mechanism 70. The second longitudinal transfer mechanism 70 feeds the assembly into the welding unit 40 for circumferential welding. After welding is completed, the second longitudinal transfer mechanism 70 sends the cladding tube to the subsequent work station.

[0058] As attached Figure 6 As shown, the arranging unit 10 includes a vibratory feeder 11 containing core blocks. The vibratory feeder 11 can arrange and push the core blocks onto the arranging guide plate 13. The arranging guide plate 13 is provided with V-shaped grooves for placing the core blocks. The direct vibration drives the core blocks to continue moving forward on the arranging guide plate 13. When the core blocks reach the first sensor 14, a signal is triggered, and the vibratory feeder 11 and the direct vibration 12 stop moving, and the core blocks stop moving forward. Before the vibratory feeder 11 and the direct vibration 12 start moving, the stop lever 15 is raised under the drive of a cylinder to block the core blocks. The core blocks are manually pushed along the arranging guide plate 13 to make the core blocks arranged tightly. The arranging guide plate 13 is provided with a measuring scale. After the manual measurement of the length of the core blocks, the cylinder drives the stop lever 15 to descend, pushing the core blocks that meet the length requirements into the material tray 16 in segments. The material tray 16 is provided with multiple V-shaped grooves. The material tray 16 is driven by a drive mechanism to move so that the core blocks can be loaded into different V-shaped grooves of the material tray 16 respectively. Vibratory plate 11, linear vibrator, etc. are installed on the base, drive mechanism is installed on the base, and the base is fixed to the bottom plate of the compartment.

[0059] As attached Figure 7As shown, the tray 16 is placed on the driving structure of the loading unit 20, when the cladding tube reaches the position of the second sensor 21 of the loading unit 20, the second sensor 21 sends a signal, the cladding tube stops feeding, the first longitudinal transmission mechanism 60 releases the cladding tube, the jaw cylinder 22 acts to clamp the cladding tube, the jaw cylinder 22 drives the cladding tube to feed towards the tray 16, after the cladding tube is in place, the cylinder drives the push rod mechanism 23 to push the pellets in the tray 16 into the cladding tube, the support block 24 is used to support the cladding tube, the driving structure drives the tray 16 to move horizontally so that the pellets in each row of V-shaped grooves in the tray 16 can be pushed into the cladding tube.

[0060] The support block in the pressing unit 30 is installed on the support rod 36 and the first bracket 31, the first bracket 31 can move horizontally under the drive of the driving mechanism, the cladding tube can move on the support block, the cladding tube feeds to the pressing unit 30 under the drive of the first longitudinal transmission mechanism 60, when the cladding tube passes through the clamping block to reach the sensor position, a signal is triggered to pause the action, the first longitudinal transmission mechanism 60 drives again to feed the cladding tube into the pressing cavity 32, the cylinder drives the clamping block to clamp the cladding tube, the end plug is placed in the end plug seat in advance, the cylinder drives the sensor 34 to push the end plug seat to advance by a certain distance into the pressing cavity 32.

[0061] After the pressing cavity 32 and the inside of the cladding tube are vacuumed by the opening 322 of the external vacuum system and the gas source, helium is filled, the cylinder drives the sensor 34 to push the end plug seat to advance by a certain distance again to press the end plug into the cladding tube. The sensor is used to measure the pressing force to alarm when overloaded. The cylinder can drive the weighing sensor and the connecting rod support rod 36 to rise to lift the cladding tube, at this time the cladding tube is separated from other support blocks and is only supported on the support block of the pressing unit 30, so that the weight of the cladding tube can be measured.

[0062] The cylinder, the pressing cavity, the clamping block, etc. are installed on the first bracket, the first bracket is installed on the driving device, the driving device is installed on the base, and the base is installed on the compartment floor.

[0063] The first longitudinal transmission mechanism 60 and the second longitudinal transmission mechanism 70 have the same structure, the support block and the cylinder are installed on the base, the cladding tube is placed on the support block and the supporting wheel, the jaw cylinder and the supporting wheel are installed on the cylinder, the jaw cylinder can clamp the cladding tube, and the cylinder drives the jaw cylinder to drive the cladding tube to advance on the support block. The sensor is used to determine whether the cladding tube is in place.

[0064] In the welding unit, the welding chamber 42, the chuck 46, and the driving mechanism are installed on the second bracket, the second bracket is installed on the driving mechanism, the driving mechanism is installed on the base, and the base is installed on the compartment floor.

[0065] The second longitudinal transmission mechanism 70 sends the combination to the welding unit 40, the cladding tube passes through the driving device, the chuck 46 to the sensor position, the sensor sends a signal, the second longitudinal transmission mechanism 70 temporarily stores the action, the second longitudinal transmission mechanism 70 acts again to send the cladding tube to the welding chamber 42, the chuck 46 acts to clamp the cladding tube, the driving device drives the chuck 46 to drive the cladding tube to rotate, and the girth welding in the welding chamber 42 is completed. The driving mechanism drives the second support to drive the parts on it to move horizontally, and the supporting block is used to support the cladding tube.

[0066] To sum up, the fuel pellet assembly system has the following technical effects:

[0067] 1. The fuel pellet assembly system is provided with a pipe mounting unit, a plug pressing unit and a welding unit, realizes continuous operation of multiple processes, and improves work efficiency.

[0068] 2. By integrating multiple units in different compartments in a box body and sealing multiple compartments from each other, the pollution problem between different processes is avoided.

[0069] 3. By setting the first longitudinal transmission mechanism and the second longitudinal transmission mechanism, and by horizontally moving the plug pressing unit and the welding unit, the continuous displacement of the fuel rod is realized, and the assembly efficiency is improved.

[0070] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A fuel pellet assembly system, characterized in that, The fuel pellets are continuously assembled using a longitudinally arranged tube-loading unit (20), a plugging unit (30), and a welding unit (40). The plugging unit (30) has a first position and a second position. The plugging unit (30) is located at the first position, and the casing tube is transmitted to the loading unit (20) to assemble with the fuel pellets in the loading unit (20) to form a fuel rod. The plug unit (30) is located at the second position, and the fuel rod is transferred to the plug unit (30) to form an assembly with the end plug. The welding unit (40) has a third position and a fourth position, the welding unit (40) being located at the third position, and the assembly being transferred from the plug unit (30) to the welding unit (40). The welding unit (40) is located at the fourth horizontal position, and the assembly is welded in the welding unit (40); It also includes a housing (50), which includes multiple compartments (52) arranged longitudinally and sealed to each other between adjacent compartments (52). The tube mounting unit (20), the plugging unit (30) and the welding unit (40) are respectively provided corresponding to the multiple compartments (52). It also includes a first longitudinal transmission mechanism (60) arranged in a common compartment with the plugging unit (30), the first longitudinal transmission mechanism (60) driving the casing tube to move between adjacent compartments to complete the tube loading and plugging process; It also includes a second longitudinal transmission mechanism (70) arranged in the same compartment as the welding unit (40). The second longitudinal transmission mechanism (70) and the first longitudinal transmission mechanism (60) are coaxially distributed. The cladding tube is driven by the second longitudinal transmission mechanism (70) instead of the first longitudinal transmission mechanism (60) to complete the welding process. The compression unit (30) includes a first support (31), which moves horizontally under the action of the driving device to achieve position switching.

2. The fuel pellet assembly system according to claim 1, characterized in that, The plugging unit (30) includes a plugging cavity (32) integrated on the first support (31). The plugging unit (30) is located at a second position. The first longitudinal transmission mechanism (60) drives the fuel rod into the plugging cavity (32) and engages with the end plug.

3. The fuel pellet assembly system according to claim 1 or 2, characterized in that, The plug chamber (32) is provided with an opening (322) through which the plug chamber (32) and the fuel rod are evacuated.

4. The fuel pellet assembly system according to claim 2, characterized in that, The plugging unit (30) includes a support rod (36) integrated on the first bracket (31). The support rod (36) is parallel to the plugging cavity (32) and maintains a certain distance in the horizontal direction. The plugging unit (30) is located at a first position. The support rod (36) is coaxial with the casing tube. The casing tube enters the compartment where the tube loading unit (20) is located along the support rod (36).

5. The fuel pellet assembly system according to claim 2, characterized in that, The plug unit (30) also includes a drive sensor (34) integrated on the first support (31). The drive sensor (34) is coaxial with the plug cavity (32). The drive sensor (34) pushes the end plug into the plug cavity (32) and engages with the fuel rod.

6. The fuel pellet assembly system according to claim 4, characterized in that, The piston rod unit (30) also includes a weighing component (38), which is connected to the support rod (36). The weighing component (38) and the support rod (36) are lifted to complete the weighing of the fuel rod.

7. The fuel pellet assembly system according to claim 1, characterized in that, The welding unit (40) includes a welding chamber (42), the welding unit (40) is located at a fourth position, and the second longitudinal transmission mechanism (70) transmits the assembly to the welding chamber (42).

8. The fuel pellet assembly system according to claim 1, characterized in that, The welding unit (40) also includes a chuck (46), which is connected to the assembly and drives the assembly to rotate.

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