A novel device for tightly fitting rod-shaped fuel element pellets to their casing

Abstract

This application relates to the technical field of equipment for fuel element development, specifically to a novel device for tightly fitting rod-shaped fuel element pellets to their casings. The device includes a main support mechanism, a spinning mechanism, a tail-end axial positioning mechanism, and a clamping positioning mechanism. The spinning mechanism is slidably mounted on the main support mechanism and can rotate around a first direction. The spinning mechanism includes a spinning wheel assembly, an electric chuck, and a radial drive mechanism. The radial drive mechanism is connected to the jaws of the electric chuck, and the spinning wheel assembly is connected to the radial drive mechanism. A pressure sensor is disposed between the spinning wheel assembly and the radial drive mechanism to detect the force applied to the spinning wheel assembly in the direction of movement of the radial drive mechanism. The tail-end axial positioning mechanism is used to clamp the end of the workpiece to be spun. The clamping positioning mechanism is disposed on the main support mechanism and located between the spinning mechanism and the tail-end axial positioning mechanism. This application can achieve spinning of slender workpieces with good product yield.

Description

Technical Field

[0001] This application relates to the technical field of equipment for fuel element development, and more specifically, to a novel device for tightly fitting rod-shaped fuel element pellets and their casings. Background Technology

[0002] In the manufacturing process of a new type of nuclear fuel element, the first step is to load fuel pellets. During pellet loading, there must be a permissible assembly gap between the cladding tube and the pellet. To ensure good thermal conductivity between the fuel pellet and the cladding material, it is necessary to minimize the gap between the fuel pellet and the cladding tube, or even achieve a tight fit between the fuel pellet and the cladding. Therefore, controlling the gap between the pellet and the cladding tube is crucial during assembly.

[0003] In the prior art, the literature "Three-wheel spinning jig for small-diameter plunger assemblies and its operating process" designs a small-diameter plunger (mandrel) spinning jig by using a mechanical slipper to control the radial feed of the three wheels; "Spinning method and spinning equipment" designs a special-shaped pipe spinning forming equipment based on the three-wheel revolution acting on the outer surface of the cylinder and the mandrel support inside the pipe by supporting the spinning, and by the relative offset between the support part and the processing part; "Spinning device and spinning method" designs a spinning device for thinning cylindrical parts by using a single-wheel rotation to facilitate workpiece clamping; "A precision spinning and shrinking device for thin-walled tubes with a fixed mandrel pattern" designs a spinning and shrinking device for pipe shrinking by using a chuck to hold the mandrel and rotate; "A spinning method for pipes and an improved spinning machine" designs an improved spinning machine for cutting pipes after spinning based on the spinning device; "A fully automatic spinning device" uses a sensor and control box, and adopts a single-wheel self-rotation and an auxiliary driven device to realize the automatic spinning of the spun parts.

[0004] Some of the aforementioned spinning devices are designed for solid workpieces such as plungers, while others are based on the relative positional offset of the workpiece to form irregularly shaped tubular parts. Some use a single spinning wheel, while others rely on the workpiece (core mold) clamping the core mold and rotating while the spinning wheel remains stationary. These methods are not suitable for spinning slender tubular parts such as rod-shaped fuel elements. Furthermore, during the assembly process, it is necessary to further achieve high-precision clearance between the core block and the shell, as well as control the shape and position dimensions of the single rod. Summary of the Invention

[0005] This application provides a novel device for tightly fitting rod-shaped fuel element pellets to their casings. Through the radial drive mechanism on the spinning mechanism, the movement of the spinning wheel assembly on the spinning mechanism can be independently controlled, thereby enabling adjustment of the spinning pressure of a single spinning wheel assembly on the workpiece to be spun. Furthermore, with the addition of a pressure sensor, the spinning pressure of the entire spinning mechanism on the workpiece to be spun can be precisely adjusted, thus achieving accurate spinning of thin, long, straight workpieces (such as rod-shaped fuel elements) whose internal structure (pellet) is unsuitable for spinning pressure. Additionally, by clamping and positioning the tail end and middle of the workpiece to be spun, with the middle clamping structure moving along with the workpiece, the shape and dimensions of a single rod can be better controlled.

[0006] This application is achieved through the following technical solution:

[0007] A novel device for tightly fitting rod-shaped fuel element pellets to their casing includes:

[0008] Main support structure;

[0009] A spinning mechanism is disposed on the main support mechanism. The spinning mechanism is configured to slide along a first direction on the main support mechanism and rotate around the first direction. The spinning mechanism includes a spinning wheel assembly, an electric chuck, and a radial drive mechanism. The radial drive mechanism is connected to the jaws of the electric chuck. The spinning wheel assembly is connected to the radial drive mechanism. The spinning wheel assembly abuts against the workpiece to be spun under the drive of the electric chuck and the radial drive mechanism. A pressure sensor is disposed between the spinning wheel assembly and the radial drive mechanism to detect the force value of the spinning wheel assembly in the direction of movement of the radial drive mechanism.

[0010] A tail end axial positioning mechanism, which is used to clamp the end of the workpiece to be spun;

[0011] A clamping and positioning mechanism is provided on the main support mechanism and located between the spinning mechanism and the tail end axial positioning mechanism for clamping the workpiece to be spun.

[0012] In some optional embodiments, the clamping positioning mechanisms are multiple and arranged side by side, with a gap between adjacent clamping positioning mechanisms.

[0013] In some optional embodiments, the clamping positioning mechanism includes:

[0014] A clamping assembly for clamping the workpiece to be spun;

[0015] A first driving mechanism is connected to the clamping assembly to drive the clamping assembly to perform a clamping action.

[0016] A second drive mechanism is connected to the first drive mechanism to drive the first drive mechanism to move in a second direction.

[0017] In some alternative embodiments, the clamping assembly includes:

[0018] A first clamping head is connected to the first driving mechanism, and the first clamping head has a flexible first clamping working surface;

[0019] The second clamping head is connected to the first driving mechanism. The second clamping head has a flexible second clamping working surface. A clamping gap suitable for clamping the workpiece to be spun is formed between the first clamping working surface and the second clamping working surface.

[0020] The first clamping working surface and the second clamping working surface are each provided with an arc-shaped groove whose radius matches that of the workpiece to be spun.

[0021] In some alternative embodiments, both the first clamping working surface and the second clamping working surface are provided with arc-shaped grooves whose radius matches that of the workpiece to be spun.

[0022] In some alternative embodiments, the clamping assembly is configured with support wheels for supporting the workpiece to be spun.

[0023] In some optional embodiments, the main support mechanism is further configured with a diameter measuring mechanism for detecting the diameter of the workpiece after it has been spun.

[0024] In some optional embodiments, the tail-end axial positioning mechanism is configured to slide along the first direction on the main support mechanism, and the tail-end axial positioning mechanism includes:

[0025] thimble;

[0026] The tail end clamping head is coaxially connected to the ejector pin and used to clamp the end of the workpiece to be spun.

[0027] In some alternative embodiments, the tail end axial positioning mechanism is provided with a locking mechanism to restrict the tail end axial positioning mechanism from sliding on the main support mechanism.

[0028] In some optional embodiments, the tail end axial positioning mechanism and the spinning mechanism share the same guide rail and form a sliding connection with the main support mechanism.

[0029] Compared with the prior art, this application has the following advantages and beneficial effects:

[0030] This application provides a novel device for tightly fitting rod-shaped fuel element pellets and their casings. Through the arrangement of a spinning mechanism, a clamping and positioning mechanism, and a tail-end axial positioning mechanism, the device can stably clamp the workpiece to be spun. The clamping and positioning mechanism ensures good stability of the workpiece during the spinning process, resulting in a novel rod-shaped fuel element with high straightness after spinning. The coordinated operation of the electric chuck and radial drive mechanism in the spinning mechanism allows for precise adjustment of the spinning force on the workpiece. With the assistance of force feedback from a pressure sensor, the spinning mechanism can apply a highly accurate spinning force to the workpiece, resulting in better spinning performance. This is particularly effective for spinning thin, long, straight workpieces (such as rod-shaped fuel elements) whose internal structure (pellet) is unsuitable for spinning pressure. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the exemplary embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the novel rod-shaped fuel element pellet and its casing tightly bonded device provided in this application embodiment;

[0033] Figure 2 This is a schematic diagram of the clamping and positioning mechanism provided in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the spinning mechanism provided in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the spinning moving mechanism provided in the embodiments of this application;

[0036] Figure 5 This is a schematic diagram of the tail end axial positioning mechanism provided in an embodiment of this application.

[0037] The attached diagram shows the markings and corresponding component names:

[0038] 1-Main support mechanism, 2-Clamping and positioning mechanism, 21-First chuck, 22-First drive mechanism, 23-Second drive mechanism, 24-Support wheel, 25-Second chuck, 3-Spinning mechanism, 31-Spinning wheel assembly, 32-Electric chuck, 321-Radial drive mechanism, 33-Rotation mechanism, 34-Controller, 4-Spinning moving mechanism, 41-Spinning moving drive mechanism, 42-Guide rail, 43-Slider, 5-Tail-end axial positioning mechanism, 51-Ejector pin, 52-Tail-end clamping head, 53-Locking structure, 6-Diameter measuring mechanism, 7-Workpiece positioning and rotation mechanism, 8-Workpiece to be spun. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0040] In the following description, numerous specific details are set forth in order to provide a thorough understanding of this application. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement this application. In other embodiments, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring this application.

[0041] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of this application. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] In the description of this application, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 the scope of protection of this application.

[0043] See also Figure 1This application provides a novel device for tightly fitting rod-shaped fuel element pellets and their casings. The novel device for tightly fitting rod-shaped fuel element pellets and their casings includes a main support mechanism 1, a spinning mechanism 3, a tail end axial positioning mechanism 5, and a clamping positioning mechanism 2.

[0044] The main support mechanism 1, serving as the overall support structure of the device, can be configured as a frame structure to ensure its structural strength, thereby guaranteeing the overall stability of the device when the main support mechanism 1 is connected to the fixed facility. This fixed facility can be the ground or a processing platform.

[0045] The spinning mechanism 3 is mounted on the main support mechanism 1, such as... Figure 4 As shown, the spinning mechanism 3 can be connected to the main support mechanism 1 via the spinning moving mechanism 4, so that the spinning mechanism 3 can move relative to the main support mechanism 1 in a first direction under the drive of the spinning moving mechanism 4. The spinning moving mechanism 4 can specifically include a spinning moving drive mechanism 41, a guide rail 42, and a slider 43. The spinning moving drive mechanism 41 can be configured as a lead screw and nut mechanism, wherein the lead screw is movably connected to the main support mechanism 1 so that it can rotate around its own axis, and the nut is connected to the spinning mechanism 3, so that when the lead screw rotates, the nut can drive the main support mechanism 1. The spinning mechanism 3 moves axially along the lead screw. The guide rail 42 is connected to the main support mechanism 1 and is arranged parallel to the lead screw at intervals. The slider 43 slides with the guide rail 42 and is connected to the spinning mechanism 3. Thus, the coordinated cooperation of the guide rail 42 and the slider 43 can guide the spinning mechanism 3, ensuring that the spinning mechanism 3 can move strictly in the first direction. At the same time, the spinning mechanism 3 will also generate a certain amount of vibration during operation. The guide rail 42 can share a certain amount of vibration energy with the lead screw, thereby maintaining the assembly accuracy between the lead screw and the nut for a long time.

[0046] See also Figure 3The spinning mechanism 3 may specifically include a spinning wheel assembly 31, an electric chuck 32, and a radial drive mechanism 321. The spinning mechanism 3 can be slidably connected to the main support mechanism 1 through a connecting plate and a connecting block. The connecting plate is connected to the slider 43 and the lead screw and nut mechanism. The connecting block is fixedly set on the connecting plate. The electric chuck 32 is movably connected to the connecting block, so that the electric chuck 32 can rotate on the connecting block. The electric chuck 32 can be driven to rotate by the rotating mechanism 33 set on the connecting plate. The rotating mechanism 33 and the electric chuck 32 can be connected by a transmission structure such as a belt or gear. The connecting block is also constructed with clearance holes suitable for the workpiece 8 to be spun to pass through. The radial drive mechanism 321 is connected to the jaws of the electric chuck 32, and the rotating wheel assembly 31 is connected to the radial drive mechanism 321. The radial drive mechanism 321 can be detachably connected to the jaws; for example, a single radial drive mechanism 321 can be fixedly connected to the jaws using multiple bolts, thus allowing for the replacement of rotating wheel assemblies 31 of different specifications. Under the drive of the electric chuck 32 and the radial drive mechanism 321, the rotating wheel assembly 31 comes into contact with the workpiece 8 to be spun. That is, under the drive of the electric chuck 32, the radial drive mechanism 321 and the rotating wheel assembly 31 move closer together to the workpiece 8 to be spun. When the distance between the rotating wheel assembly 31 and the workpiece 8 to be spun is small... The radial drive mechanism 321 drives the rotating wheel assembly 31 closer to the workpiece 8 until it contacts the workpiece 8. A pressure sensor is installed between the rotating wheel assembly 31 and the radial drive mechanism 321 to detect the force applied to the rotating wheel assembly 31 in the direction of movement of the radial drive mechanism 321. The force feedback from the pressure sensor allows for more precise control of each individual radial drive mechanism 321, ensuring that all rotating wheel assemblies 31 apply the same spinning force to the workpiece 8. This, in turn, ensures greater stability in the magnitude and direction of the spinning force applied by the entire spinning mechanism 3 to the workpiece 8, improving the product yield of the workpiece 8. The data detected by the pressure sensor can be collected by a controller 34, which then controls the radial drive mechanism 321 to accurately adjust the position of the rotating wheel assembly 31. The controller 34 can be a microcontroller, programmable logic controller 34, or industrial microcomputer. The controller 34 can be installed on the connector block, thereby reducing the work of laying signal lines, avoiding excessive interference due to excessively long lines, and ensuring that the signal can be accurately transmitted between the pressure sensor and the controller 34.

[0047] The tail end axial positioning mechanism 5 is used to clamp the end of the workpiece 8 to be spun. The intended clamping position of the tail end axial positioning mechanism 5 corresponds in height to the position of the clearance hole in the spinning mechanism 3. Thus, when the workpiece 8 to be spun passes through the clearance hole and is clamped by the tail end axial positioning mechanism 5, the workpiece 8 to be spun can maintain a relatively stable posture.

[0048] The clamping and positioning mechanism 2 is set on the main support mechanism 1 and located between the spinning mechanism 3 and the tail end axial positioning mechanism 5 to clamp the workpiece 8 to be spun. The clamping and positioning mechanism 2 can be fixedly connected to the main support mechanism 1 to ensure its own good stability. The clamping and positioning mechanism 2 mainly clamps the workpiece 8 from the middle of the length direction of the workpiece 8. After clamping the workpiece 8, it can cooperate with the tail end axial positioning mechanism 5 to make the workpiece 8 to be spun maintain a more stable posture, which can improve the vibration resistance of the workpiece 8 during the spinning process, so that the workpiece 8 to be spun has good straightness after being spun.

[0049] The novel rod-shaped fuel element pellet and casing tightly fitting device provided in this application embodiment allows each spinning wheel assembly 31 to achieve precise position adjustment by being driven by a corresponding radial drive mechanism 321. This enables precise adjustment of the spinning force of a single spinning wheel assembly 31 on the workpiece 8 to be spun. With the addition of pressure sensors, the spinning force on the workpiece 8 to be spun can be monitored in real time in all directions. Then, the radial drive mechanism 321 drives the spinning wheel assembly 31 to ensure that the spinning force on the workpiece 8 to be spun remains consistent in all directions, thereby ensuring the product quality of the workpiece 8 after it has been spun.

[0050] The workpiece 8 to be spun typically has a relatively long length and a small diameter, meaning it has a slender overall structure. Before being spun, the workpiece 8 possesses a certain rigidity. After the clamping and positioning mechanism 2 holds the middle of the workpiece 8, it can maintain a stable and correct posture, meaning it has good straightness. When the workpiece 8 is spun, the rotating pair on the spinning mechanism 3 may generate some vibration during rotation, and friction may also occur between the spinning wheel assembly 31 and the workpiece 8. The combined effect of these two factors may cause the workpiece 8 to be subjected to a certain bending moment at one or more moments during the spinning feed (i.e., the spinning mechanism 3 moves along the axial direction of the workpiece 8), which may reduce the straightness of the workpiece 8. Therefore, in some optional embodiments, there are multiple clamping and positioning mechanisms 2 arranged side by side, with a gap between adjacent clamping and positioning mechanisms 2. When multiple clamping and positioning mechanisms 2 are set, multiple parts of the workpiece 8 to be spun will be clamped. The shaft length between adjacent clamped parts is small, making it less prone to deformation. The vibration on the workpiece 8 to be spun can be transmitted to the main support mechanism 1 through multiple clamping and positioning mechanisms 2, so that the workpiece 8 to be spun can maintain a relatively stable posture during the spun process.

[0051] During the movement of the spinning mechanism 3, the clamping and positioning mechanism 2 will obstruct the feed of the spinning mechanism 3. In order to achieve automated spinning, we prefer that the clamping and positioning mechanism 2 can be controlled by the controller 34 for automatic clamping. Therefore, in some optional embodiments, the clamping and positioning mechanism 2 may include a clamping component, a first driving mechanism 22 and a second driving mechanism 23. The clamping component is used to clamp the workpiece 8 to be spun. The first driving mechanism 22 is controlled by the controller 34 to operate. The first driving mechanism 22 is connected to the clamping component, so that under the drive of the first driving mechanism 22, the clamping component can clamp the workpiece 8 to be spun. The second driving mechanism 23 is controlled by the controller 34 to operate. The second driving mechanism 23 is connected to the first driving mechanism 22, so that under the drive of the second driving mechanism 23, the first driving mechanism 22 can move away from the workpiece 8 to be spun in a second direction. The second direction can be any direction other than the axis of the workpiece 8 to be spun, as long as the first drive mechanism 22 can move away from the workpiece 8 to be spun along the second direction. Of course, if the second direction is closer to the axis of the workpiece 8 to be spun, the first drive mechanism 22 needs a larger operating space to ensure that there is a sufficient distance between it and the workpiece 8 to avoid the spinning mechanism 3. In order to reduce the overall space occupation of the device, in actual implementation, the second direction can be a radial direction of the workpiece 8 to be spun.

[0052] In some alternative embodiments, see [reference]. Figure 2The clamping assembly may include a first clamping head and a second clamping head. The first clamping head is connected to a first driving mechanism 22. The first clamping head can be constructed as a T-shaped block, thereby providing a large clamping distance for the workpiece 8 to be spun with a small space occupation. The first clamping head has a flexible first clamping working surface, which can be an independent layered structure set on the first clamping head, or it can be formed by making the entire first clamping head a flexible material. The second clamping head is connected to the first driving mechanism 22. The transmission structure between the first clamping head and the first driving mechanism 22 and the transmission structure between the second clamping head and the first driving mechanism 22 have opposite transmission directions. For example, the first driving mechanism 22 may have two threaded segments with opposite rotation directions. The two threaded segments are threadedly engaged with the first clamping head and the second clamping head, respectively. When the first driving mechanism 22 drives it to rotate, the first clamping head and the second clamping head can move in opposite directions. That is, the first driving mechanism 22 can simultaneously drive the first clamping head and the second clamping head to move in opposite directions to achieve the clamping function. In this way, the first clamping head and the second clamping head clamp the workpiece 8 to be spun. During the process, the workpiece 8 to be spun can be subjected to uniform force, avoiding deformation caused by unilateral compression of the workpiece 8 during clamping. The second clamping head can also be constructed as a T-shaped block similar to the first clamping head. The second clamping head has a flexible second clamping working surface. The second clamping working surface can be an independent layered structure set on the second clamping head, or it can be formed by making the entire first clamping head a flexible material. It is worth noting that when the first clamping surface is an independent layered structure, the second clamping working surface is also preferably set as an independent layered structure. When the first clamping head When the material is flexible, the second clamping head is also made of flexible material. This ensures that the workpiece 8 to be spun is subjected to balanced forces during clamping, preventing deformation due to uneven forces. A clamping gap suitable for clamping the workpiece 8 is formed between the first and second clamping working surfaces. At least one of the first and second clamping working surfaces is constructed with an arc-shaped groove with a radius matching that of the workpiece 8. The arc-shaped groove enables rapid positioning of the workpiece 8 during clamping. In particular, in this embodiment, both the first and second clamping working surfaces are flexible. When positioning the workpiece 8, local shaft segments of the workpiece 8 will not be subjected to rigid compression, thus ensuring the structural consistency of the workpiece 8 before and after being clamped by the clamping and positioning mechanism 2. Furthermore, the flexible first and second clamping working surfaces can also provide a buffer for the workpiece 8 to be spun during the spinning process to absorb vibration energy, thereby making the workpiece 8 to be spun have higher state stability during the spinning process.

[0053] In order to ensure that the workpiece 8 to be spun is subjected to force synchronously during the clamping process, in some optional embodiments, both the first clamping working surface and the second clamping working surface are constructed with arc-shaped grooves whose radius matches that of the workpiece 8 to be spun.

[0054] In some alternative embodiments, further reference may be made. Figure 2 The clamping assembly is equipped with support wheels 24 for supporting the workpiece 8 to be spun. As the clamping assembly is driven by the second drive mechanism 23 to approach the workpiece 8 to be spun, the support wheels 24 can first contact the workpiece 8 to achieve the initial positioning of the workpiece 8 to be spun, so that the clamping assembly can quickly and accurately clamp the workpiece 8 to be spun, thereby improving the clamping efficiency.

[0055] In some optional embodiments, the main support mechanism 1 is also equipped with a diameter measuring mechanism 6 for detecting the diameter of the workpiece 8 after it has been spun. By setting up the diameter measuring mechanism 6, the diameter parameter of the workpiece 8 after it has been spun can be monitored in real time. Therefore, the controller 34 can issue alarms or prompts immediately based on the feedback from the diameter measuring mechanism 6, allowing operators to adjust the device promptly. Simultaneously, after the spinning wheel assembly 31 has been finely adjusted, the controller 34 can further adjust the position of the spinning wheel assembly 31 based on the feedback value from the diameter measuring mechanism 6, thereby ensuring a better product yield.

[0056] In some optional embodiments, see also Figure 1 and Figure 5 The tail end axial positioning mechanism 5 is configured to slide along a first direction on the main support mechanism 1, thereby enabling the clamping of workpieces 8 of different lengths to be spun. The tail end axial positioning mechanism 5 may include a ejector pin 51 and a tail end clamping head 52. The tail end axial positioning mechanism 5 may also include a connecting seat. The tail end axial positioning mechanism 5 cooperates with the guide rail 42 on the main support mechanism 1 through the connecting seat to realize the sliding of the tail end axial positioning mechanism 5 on the main support mechanism 1. The tail end clamping head 52 is coaxially connected to the ejector pin 51 and is used to clamp the end of the workpiece 8 to be spun.

[0057] In some optional embodiments, a locking mechanism is provided on the tail-end axial positioning mechanism 5 to restrict the sliding of the tail-end axial positioning mechanism 5 on the main support mechanism 1. The locking mechanism can be in two states under external force. In the first state, the tail-end axial positioning mechanism 5 can slide freely on the guide rail 42 to clamp workpieces 8 of different lengths to be spun. In the second state, the tail-end axial positioning mechanism 5 is fixed relative to the guide rail 42 to keep the workpiece 8 stable. The locking mechanism can be configured, for example, as a pin structure. When the locking mechanism is driven in the first manner, the pin can approach the guide rail 42 to put the locking mechanism in the second state. When the locking mechanism is driven in the second manner, the pin can move away from the guide rail 42 to put the locking mechanism in the first state. The first and second methods can involve applying force to the locking mechanism in different directions.

[0058] In some optional embodiments, the tail-end axial positioning mechanism 5 and the spinning mechanism 3 share the same guide rail 42 and form a sliding connection with the main support mechanism 1. This ensures that the workpiece 8 being spun can maintain a high degree of coaxiality after being clamped, allowing the spinning process to proceed smoothly and guaranteeing product yield.

[0059] In some optional embodiments, the main support mechanism 1 may also be equipped with a workpiece positioning and rotation mechanism 7. The workpiece positioning and rotation mechanism 7 can clamp and position the workpiece 8 to be spun and drive the workpiece 8 to be spun to rotate. Through the driving of the workpiece positioning and rotation mechanism 7 and the active feeding of the spinning mechanism 3, the spinning efficiency can be improved.

[0060] Understandably, when the workpiece 8 to be spun is rotated by the workpiece positioning and rotating mechanism 7, the clamping and positioning mechanism 2 can release the clamping action of the workpiece 8 to be spun or the clamping force can be configured to allow the workpiece 8 to be spun to rotate.

[0061] In summary, this application enables the radial drive mechanism 321 to independently drive a single spinning wheel assembly 31 to move, thereby achieving control over the spinning pressure of the single spinning wheel assembly 31 on the workpiece 8 to be spun. In conjunction with the setting of a pressure sensor, displacement-pressure coupling control can be achieved during the spinning process, thereby ensuring better spinning effect and guaranteeing product yield.

[0062] By setting the clamping and positioning mechanism 2, this application can ensure that the workpiece 8 to be spun has good stability during the spun process and can make the workpiece 8 to be spun have good straightness after spun.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A novel device for tightly fitting rod-shaped fuel element pellets to their casing, characterized in that, include: Main support structure (1); A spinning mechanism (3) is provided on the main support mechanism (1). The spinning mechanism (3) is configured to slide along a first direction on the main support mechanism (1) and rotate around the first direction. The spinning mechanism (3) includes a spinning wheel assembly (31), an electric chuck (32), and a radial drive mechanism (321). The radial drive mechanism (321) is connected to the jaws of the electric chuck (32). The spinning wheel assembly (31) is connected to the radial drive mechanism (321). The spinning wheel assembly (31) abuts against the workpiece (8) to be spun under the drive of the electric chuck (32) and the radial drive mechanism (321). A pressure sensor is provided between the spinning wheel assembly (31) and the radial drive mechanism (321) to detect the force value of the spinning wheel assembly (31) in the direction of movement of the radial drive mechanism (321). Tail end axial positioning mechanism (5), the tail end axial positioning mechanism (5) is used to clamp the end of the workpiece (8) to be spun; A clamping and positioning mechanism (2) is provided on the main support mechanism (1) and located between the spinning mechanism (3) and the tail end axial positioning mechanism (5) for clamping the workpiece (8) to be spun.

2. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 1, characterized in that, The clamping positioning mechanism (2) is multiple and arranged side by side, with a gap between adjacent clamping positioning mechanisms (2).

3. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 1 or claim 2, characterized in that, The clamping positioning mechanism (2) includes: A clamping assembly for clamping the workpiece to be spun (8); A first driving mechanism (22) is connected to the clamping assembly to drive the clamping assembly to perform a clamping action; The second drive mechanism (23) is connected to the first drive mechanism (22) to drive the first drive mechanism (22) to move in the second direction.

4. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 3, characterized in that, The clamping assembly includes: A first clamping head is connected to the first driving mechanism (22), and the first clamping head has a flexible first clamping working surface; The second clamping head is connected to the first driving mechanism (22). The second clamping head has a flexible second clamping working surface. A clamping gap suitable for clamping the workpiece (8) to be spun is formed between the first clamping working surface and the second clamping working surface. Among them, at least one of the first clamping working surface and the second clamping working surface is constructed with an arc-shaped groove whose radius matches that of the workpiece (8) to be spun.

5. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 4, characterized in that, Both the first clamping working surface and the second clamping working surface are constructed with arc-shaped grooves whose radius matches that of the workpiece (8) to be spun.

6. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 3, characterized in that, The clamping assembly is equipped with support wheels (24) for supporting the workpiece (8) to be spun.

7. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 1, characterized in that, The main support mechanism (1) is also equipped with a diameter measuring mechanism (6) for detecting the diameter of the workpiece (8) to be spun after being spun.

8. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 1, characterized in that, The tail end axial positioning mechanism (5) is configured to slide along the first direction on the main support mechanism (1), and the tail end axial positioning mechanism (5) includes: thimble (51); Tail end clamping head (52) is coaxially connected to the ejector pin (51) and used to clamp the end of the workpiece (8) to be spun.

9. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 8, characterized in that, The tail end axial positioning mechanism (5) is equipped with a locking mechanism, which is used to restrict the tail end axial positioning mechanism (5) from sliding on the main body support mechanism (1).

10. The novel rod-shaped fuel element pellet and casing tightly fitting device according to claim 8, characterized in that, The tail end axial positioning mechanism (5) and the spinning mechanism (3) share the same guide rail and form a sliding connection with the main support mechanism (1).

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