A rotary flexible support tool

Abstract

The application discloses a rotary flexible support tool, and relates to the technical field of nuclear fuel element manufacturing equipment, which comprises a mounting bracket, a supporting ring arranged on the mounting bracket, an elastic member and a bearing. The supporting ring is fixed on the mounting bracket, one end of the elastic member is connected with the supporting ring, and the other end of the elastic member is connected with the outer ring of the bearing, so that the bearing is suspended in the inner ring of the supporting ring and can elastically float in the radial plane. The inner hole of the inner ring of the bearing is used for allowing a to-be-welded object to pass through and forming contact support on the to-be-welded object. When welding and packaging, the application provides flexible follow-up support for the long suspended section while the to-be-welded object is clamped and rotated, compensates for the deflection of the to-be-welded object, restrains the radial jumping of the welding point, and guarantees the stable centering of a laser beam and a weld.

Description

Technical Field

[0001] This invention relates to the field of nuclear fuel element manufacturing equipment, and in particular to a rotating flexible support fixture. Background Technology

[0002] During the fabrication process, the end joints of the workpiece to be welded need to be welded and sealed to the cladding. The workpiece mainly consists of a cladding tube and fuel pellets placed inside the cladding tube. Both ends of the cladding tube are sealed through end joints, forming a circumferential weld between the end joints and the cladding tube. The welding and sealing process typically employs laser welding within a protective chamber to ensure weld quality and prevent oxidation of the molybdenum alloy at high temperatures. During welding, the workpiece needs to rotate uniformly around its own axis to ensure uniform fusion of the circumferential weld. Simultaneously, the laser beam must maintain precise and stable alignment with the weld to prevent welding defects such as incomplete penetration or poor fusion.

[0003] However, the large length, high aspect ratio, and poor rigidity of the workpieces to be welded result in significant deflection under their own weight. During welding, the long, suspended section of the workpiece far from the clamping point experiences low-frequency swaying, and the radial runout of the welding area in both the axial and vertical directions exceeds the allowable range of laser welding, causing the laser beam to deviate from the weld. Existing support methods such as V-shaped brackets, center frames, and roller frames are all rigid supports. The rigid constraint they apply to the long suspended section interferes with the rotational movement of the workpiece, making it difficult to synchronize with the rotational speed of the workpiece. Furthermore, forcibly constraining the workpiece to the theoretical axis position introduces additional stress, which cannot meet the requirements of clamping accuracy and rotational stability for welding and encapsulation. In addition, the friction between the rigid support and the surface of the workpiece can easily scratch the surface of the workpiece, affecting the surface quality of the nuclear fuel rods.

[0004] Therefore, how to ensure the smooth rotation of the long suspended section of the object to be welded while supporting it, and how to adaptively compensate for the deflection of the object to be welded, so as to control the radial runout of the welding area within the allowable range of the laser welding process and ensure that the laser beam and the weld are precisely and stably aligned, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a rotating flexible support fixture to solve the technical problems in the prior art where rigid support and rotation of the workpiece interfere with each other during welding and packaging of long workpieces, and where the radial runout of the welding area is excessive due to the deflection of the workpiece. This invention enables the laser beam to maintain precise and stable alignment with the weld, improves welding quality, and meets the requirements of clamping accuracy and rotational stability for welding and packaging of workpieces.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides a rotary flexible support fixture, comprising: an elastic element and a bearing, wherein the elastic element is arranged circumferentially around the bearing to provide radial elastic support for the bearing, and the inner ring of the bearing is used to support the workpiece to be welded and allow the workpiece to be welded to rotate about its own axis.

[0007] In one embodiment, the supporting ring and the bearing are coaxially arranged, and a plurality of elastic elements are disposed in the annular space between the supporting ring and the bearing. The two ends of the elastic elements are respectively connected to the supporting ring and the outer ring of the bearing.

[0008] As one embodiment, it also includes a mounting bracket; a support ring fixed on the mounting bracket; one end of an elastic element connected to the support ring; the outer ring of the bearing connected to the other end of the elastic element, so that the bearing is suspended in the inner ring of the support ring, and the bearing can elastically float in the radial plane; the inner hole of the bearing's inner ring is used for the object to be welded to pass through, and the inner ring of the bearing is used to form contact support for the object to be welded.

[0009] In one embodiment, the supporting ring is made of plastic and is fixedly connected to the top of the mounting bracket by fixing bolts. It serves to insulate and dampen the workpiece to be welded and also acts as the mounting base for the elastic element.

[0010] As one embodiment, the mounting bracket is a rigid metal bracket, which is fixedly installed on the welding platform through pre-set holes and fasteners.

[0011] In one embodiment, the outer ring of the bearing is fitted with a bearing outer frame, and the end of the elastic element away from the supporting ring is connected to the bearing outer frame.

[0012] As one embodiment, the rotary flexible support fixture is used in conjunction with the clamping rotary device. The clamping rotary device and the rotary flexible support fixture are arranged at intervals along the axial direction of the workpiece to be welded. The clamping rotary device has a through hole through which the workpiece to be welded passes, for clamping the rod of the workpiece to be welded near the joint end, and driving the workpiece to be welded to rotate around its own axis.

[0013] As one embodiment, the clamping and rotating device is a three-jaw chuck with a through hole.

[0014] As one embodiment, it also includes a welding protection chamber, in which the end of the workpiece to be welded extends into the welding protection chamber after passing through the through hole of the clamping and rotating device.

[0015] As one implementation, the number of the rotary flexible support fixtures is determined according to the length of the object to be welded.

[0016] The present invention achieves the following technical effects compared to the prior art: This invention fixes a support ring to a mounting bracket, connecting one end of an elastic element to the support ring and the other end to the outer ring of a bearing. The bearing is suspended within the inner ring of the support ring and can elastically float in the radial plane. Simultaneously, the inner hole of the bearing allows the workpiece to pass through and form contact support, creating a flexible, follow-up support for the long suspended section of the workpiece. The bearing allows the workpiece to rotate smoothly around its own axis at the support point, synchronized with the rotation of the clamping and rotating device. Under the action of the elastic element, the bearing as a whole floats within a small range in the radial plane according to the actual position of the workpiece, adaptively compensating for the deflection and welding thermal deformation of the workpiece, rather than forcibly constraining it to the theoretical axial position. Therefore, the radial runout of the workpiece to be welded within the welding area is controlled within the allowable range of the laser welding process. The laser beam and the weld are precisely and stably aligned, effectively avoiding welding defects such as incomplete penetration and poor fusion. Thus, while controlling the deflection runout of the workpiece to be welded, stable support for the workpiece is achieved, solving the above-mentioned technical problems of mutual interference between the support of the long suspended section and the rotation of the workpiece to be welded, and excessive radial runout in the welding area caused by the deflection of the workpiece to be welded. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the main view structure of the tooling in one or more embodiments of the present invention; Figure 2 This is an isometric structural diagram of the tooling in one or more embodiments of the present invention; Figure 3 This is a schematic diagram of the isometric structure of the clamping end of the workpiece to be welded and the welding protection chamber in one or more embodiments of the present invention; Figure 4 This is a schematic diagram of the main view structure of the clamping end of the workpiece to be welded and the welding protection chamber in one or more embodiments of the present invention; Figure 5 This is a schematic diagram of the right view of the clamping end of the workpiece to be welded and the welding protection chamber in one or more embodiments of the present invention.

[0019] The components include: 1. Support ring; 2. Elastic element; 3. Bearing; 4. Bearing frame; 5. Fixing bolt; 6. Mounting bracket; 7. Three-jaw chuck; and 8. Welding protection chamber. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1 to 5 As shown, the present invention provides a rotating flexible support fixture, including an elastic element 2 and a bearing 3. The elastic element 2 is arranged circumferentially around the bearing 3 to provide radial elastic support for the bearing 3. The inner ring of the bearing 3 supports the workpiece to be welded and allows it to rotate about its own axis. In this embodiment, the bearing 3 is used to allow the workpiece (bar) to be welded to rotate smoothly at the support point. The elastic element 2 allows the workpiece to float within a small range in the radial plane, rather than forcibly constraining it to the theoretical axis position. The elastic element 2 can be a compression spring, leaf spring, rubber elastomer, or gas spring.

[0023] In one specific embodiment, the rotary flexible support fixture also includes a support ring 1, which is coaxially arranged with the bearing 3. Multiple elastic elements 2 are disposed in the annular space between the support ring 1 and the bearing 3, with both ends of the elastic elements 2 connected to the outer rings of the support ring 1 and the bearing 3, respectively. This example uses the support ring 1 to support the elastic elements 2. In some embodiments, it also includes a bearing outer frame 4, fixing bolts 5, and a bracket; the bracket is fixed within the support fixture cavity, the support ring 1 is fixed to the bracket by the fixing bolts 5, the bearing 3 is snapped into the inside of the bearing outer frame 4, and the outer surface of the bearing outer frame 4 is provided with a connecting structure for cooperating with the spring, such as a connecting hook or a connecting ring.

[0024] The aforementioned sealed connection / connection structure can achieve a sealed connection / connection by setting flange plates and sealing rings.

[0025] In one specific embodiment, the rotary flexible support fixture also includes a mounting bracket 6, a support ring 1, an elastic element 2, and a bearing 3. The mounting bracket 6 has sufficient structural rigidity and stability to fix the entire fixture to the welding platform, providing a stable foundation for the upper support unit. The support ring 1 is fixed to the mounting bracket 6, serving as the fixed base for the elastic element 2. One end of the elastic element 2 is connected to the support ring 1, and the other end is connected to the outer ring of the bearing 3. The bearing 3 is elastically suspended within the inner ring of the support ring 1 via the elastic element 2, allowing the bearing 3 to float elastically within a small range in the radial plane. The inner hole of the bearing 3's inner ring allows the workpiece to pass through, and the inner ring of the bearing 3 contacts the workpiece, forming a contact support. During welding and encapsulation, the object to be welded passes through the inner ring of the bearing 3. The inner ring of the bearing 3 provides radial support for the object to be welded, with the support point located on the long suspended section of the object to be welded away from the clamping point. Since the bearing 3 is elastically suspended by the elastic element 2, the bearing 3 can float in the radial plane with the object to be welded while supporting it. This provides effective support for the long suspended section of the object to be welded, while allowing the object to be welded to rotate smoothly around its own axis. The support point simultaneously has three functions: support, follow-up, and rotation. This achieves that support and rotation do not interfere with each other, solving the technical problem of mutual interference between the rigid support of the long suspended section and the rotation of the object to be welded.

[0026] In one specific embodiment, the elastic elements 2 are arranged radially and uniformly along the circumference of the supporting ring 1, forming a multi-directional compliant mechanism, enabling the bearing 3 to generate a certain elastic displacement in all radial directions. In this embodiment, there are ten elastic elements 2, which are evenly distributed and installed along the 360° circumference of the supporting ring 1. One end of each elastic element 2 is fixedly connected to the inner ring of the supporting ring 1, and the other end of each elastic element 2 is fixedly connected to the outer ring of the bearing 3. The ten elastic elements 2 together support the bearing 3, keeping the bearing 3 located in the central area of ​​the supporting ring 1. After the object to be welded is inserted into the inner hole of the bearing 3, the bearing 3 deviates from the center as the position of the object to be welded changes. The elastic elements 2 in the deviated direction are compressed, while the elastic elements 2 in the opposite direction are stretched. Due to its own weight and inherent deflection, the axis of the object to be welded is not an ideal straight line. During the welding process, the actual position of the object to be welded may shift in all radial directions. Since the elastic element 2 is arranged uniformly radially along the circumference, no matter which radial direction the object to be welded shifts in, the corresponding elastic element 2 can be compressed or stretched, while the elastic element 2 in the direction that has not shifted remains in its original state. This provides uniform elastic support to the bearing 3 in all radial directions, causing the inner ring of the bearing 3 to shift slightly with the actual position of the object to be welded. This achieves adaptive compensation for the deflection of the object to be welded, rather than forcibly constraining the object to be welded to the theoretical axis position, thus solving the technical problem of uneven elastic displacement in all radial directions.

[0027] In one specific embodiment, the supporting ring 1 is made of plastic. The supporting ring 1 is fixedly connected to the top of the mounting bracket 6 by fixing bolts 5. The fixing bolts 5 press and fix the supporting ring 1 to the top of the mounting bracket 6, ensuring the stability of the supporting ring 1 under the tension of the elastic element 2. The supporting ring 1 serves two purposes: firstly, it acts as a mounting base for the elastic element 2, providing a stable foundation for its fixation and ensuring accurate installation of each elastic element 2; secondly, it provides insulation and vibration damping for the workpiece to be welded. The supporting ring 1 electrically isolates the workpiece from the mounting bracket 6, preventing welding current or static electricity from being conducted through the support path and interfering with the welding process. Simultaneously, the damping characteristics of the engineering plastic absorb vibrations during the welding process, preventing vibrations from being transmitted to the workpiece through the support path, further ensuring the stability of the workpiece in the welding area and solving the technical problems of insulation and vibration damping for the workpiece.

[0028] In one specific implementation, the mounting bracket 6 is a rigid metal bracket, which is fixedly installed on the welding platform through pre-set holes and fasteners. The holes on the welding platform are pre-set during platform manufacturing; during installation, simply aligning the mounting bracket 6 with the holes and tightening it with fasteners secures the fixture to the welding platform without requiring any modifications. After installation, the mounting bracket 6 is fixed in position, providing a stable foundation for the entire support unit and ensuring that the support point position does not change during welding. This maintains a stable coaxial relationship between the inner ring of the bearing 3 and the rotation center of the clamping and rotating device, preventing additional offset of the workpiece due to support point position drift and solving the technical problem of fixture installation and positioning stability.

[0029] In one specific implementation, a bearing outer frame 4 is fitted around the outer circumference of the outer ring of the bearing 3, and the end of the elastic element 2 away from the supporting ring 1 is connected to the bearing outer frame 4. The bearing outer frame 4 provides a connection interface for the connection between the elastic element 2 and the bearing 3. The ends of each elastic element 2 are connected to the bearing outer frame 4, and the elastic force of the elastic element 2 is evenly transmitted to the outer ring of the bearing 3 through the bearing outer frame 4. This avoids the elastic element 2 directly connecting to the outer ring of the bearing 3 and causing local compression damage to the bearing 3, while ensuring that the force exerted by each elastic element 2 on the bearing 3 is evenly distributed, so that the bearing 3 operates smoothly and floats without jamming, thus solving the technical problem of the reliability of the connection between the elastic element 2 and the bearing 3.

[0030] As a specific implementation, the bearing 3 allows the workpiece to be welded to rotate freely around its own axis at the support point. During the welding process, the workpiece rotates uniformly around its own axis with the clamping and rotating device. The inner ring of the bearing 3 cooperates synchronously with the workpiece, allowing the workpiece to rotate smoothly at the support point. At the same time, the bearing 3 as a whole can float within a small range in the radial plane under the elastic action of the elastic element 2. The floating range of the bearing 3 in the radial plane is determined by the elastic deformation of the elastic element 2. The floating process does not change the supporting effect of the bearing 3 on the workpiece. Due to its own weight and inherent deflection, the axis of the workpiece is not an ideal straight line. The bearing 3 shifts slightly with the actual position of the workpiece. Adaptive compensation is achieved by compressing or stretching the elastic element 2 in the corresponding direction, rather than forcibly constraining the workpiece to the theoretical axis position. When the workpiece rotates, the inner ring of the bearing 3 rotates synchronously with the workpiece. The outer ring of the bearing 3 is connected to the support ring 1 through the elastic element 2. Thus, the rotational motion of the workpiece and the radial elastic floating provided by the elastic element 2 do not interfere with each other, solving the technical problem of mutual interference between the rotation of the workpiece and the radial elastic floating.

[0031] In one specific implementation, this tooling and the clamping rotation device work together to form a composite clamping system of rigid fixation and flexible follow-up. The clamping rotation device and the tooling are arranged at intervals on the welding platform along the axial direction of the workpiece to be welded, wherein the clamping rotation device is located on the side closer to the joint end of the workpiece to be welded, and the tooling is located on the side of the long suspended section of the workpiece to be welded away from the joint end; the clamping rotation device has a through hole for the workpiece to be welded to pass through, for clamping the rod of the workpiece to be welded near the joint end, and driving the workpiece to be welded to rotate around its own axis. During clamping, the end of the workpiece to be welded (joint end) is passed sequentially through the inner hole of the bearing 3 of the tooling and the through hole of the clamping and rotating device until the part to be welded extends into the welding protection chamber 8. The clamping and rotating device is activated to clamp the rod near the joint end. After clamping, the clamping and rotating device forms a rigid fixation on the workpiece to be welded. On the one hand, it forms an axial positioning of the workpiece to be welded, preventing axial movement during welding and ensuring the stability of the weld position. On the other hand, it establishes a radial rotation reference with the clamping point as the reference, so that the rotation center is stable when the workpiece to be welded rotates around its own axis. At the same time, since the clamping point is close to the joint end, the cantilever length is greatly shortened, effectively reducing the low-frequency shaking of the welding area in the axial and vertical directions caused by the overall deflection of the workpiece to be welded, creating the preconditions for the precise alignment of the laser beam and the weld. For the long suspended section on the other side of the clamping point, the tooling provides flexible follow-up support to suppress the large-range radial runout of the workpiece to be welded, solving the technical problem of the coordination between the support of the long suspended section and the rotation drive of the workpiece to be welded.

[0032] As a specific implementation method, such as Figure 3As shown, the clamping and rotating device is a three-jaw chuck 7 with a through hole. The clamping point of the three-jaw chuck 7 is close to the joint end of the workpiece to be welded. The center of the three-jaw chuck 7 has a through hole for the workpiece to pass through. During clamping, the workpiece is placed through the through hole of the three-jaw chuck 7. The three jaws of the three-jaw chuck 7 synchronously close and clamp the workpiece in the circumferential direction. The synchronous movement of the three jaws ensures that the axis of the workpiece to be welded coincides with the rotation center of the three-jaw chuck 7, realizing automatic centering. After the three-jaw chuck 7 clamps the workpiece to be welded, the workpiece to be welded rotates at a constant speed around its own axis with the three-jaw chuck 7. During the welding process, the rotation of the workpiece to be welded is stable and without slippage. Because the clamping point is close to the joint end, the cantilever length of the workpiece to be welded is greatly shortened, and the low-frequency shaking of the welding area caused by the overall deflection of the workpiece to be welded is effectively suppressed, solving the technical problem of the specific implementation method of the clamping and rotating device.

[0033] In one specific implementation, the tooling is positioned on the side of the long, suspended section of the workpiece away from the joint end, forming a flexible, follow-up support for the long, suspended section. During welding, the workpiece in the long, suspended section deflects due to its own weight, and its axis is not an ideal straight line. At this time, the inner ring of the bearing 3 shifts slightly with the actual position of the workpiece. This is compensated adaptively by compressing or stretching the elastic element 2 in the corresponding direction. During the floating process, the inner ring of the bearing 3 remains in contact with the workpiece, ensuring uninterrupted support. During welding, the workpiece undergoes thermal deformation due to heat, causing additional shifts. These additional shifts are also absorbed by compressing or stretching the elastic element 2 in the corresponding direction. The elastic element 2 maintains support for the bearing 3 throughout the compensation process, ensuring that the long, suspended section remains in a controlled support state. This solves the technical problems of the long, suspended section's placement and support method.

[0034] In one specific implementation, this tooling is used in conjunction with the welding protection chamber 8. The end of the workpiece to be welded passes through the through hole of the clamping and rotating device and extends into the welding protection chamber 8. The welding protection chamber 8 is arranged adjacent to the clamping and rotating device. The end of the workpiece to be welded passes through the through hole of the three-jaw chuck 7 and directly enters the welding protection chamber 8. The welding protection chamber 8 accommodates the part of the workpiece to be welded, providing protection for the welding area and placing the part to be welded in a protected environment. Laser welding is completed within the welding protection chamber 8, avoiding external interference to the welding area and ensuring the quality of the weld formation. After the laser welding of the part to be welded is completed within the welding protection chamber 8, the welding and encapsulation of the end joint and the shell are completed, solving the technical problem of protecting the welding area.

[0035] As a specific implementation, the technical solution of the present invention is a rigid fixing and flexible follow-up composite clamping system, which consists of a clamping rotation device and a tooling working together. The clamping rotation device rigidly fixes the workpiece near the joint end, establishing axial positioning and radial rotation references, and drives the workpiece to rotate around its own axis; the tooling provides flexible follow-up support for the long suspended section on the other side of the clamping point, and adaptively compensates for the deflection of the workpiece and the thermal deformation of welding through internal elastic elements, allowing the workpiece to rotate while suppressing its large-scale radial runout. The rigid fixing end and the flexible follow-up end cooperate to ensure smooth rotation of the workpiece during welding and controlled radial runout in the welding area.

[0036] As a specific implementation method, multiple rotary flexible fixtures can be set up, and the selection can be made freely according to the length of the object to be welded. The length of the object to be welded may affect the levelness of the fixation. In order to better fix the object to be welded, the number of rotary flexible support fixtures can be increased, so that the object to be welded can be more stably fixed on the rotary flexible support fixtures.

[0037] The working process of this invention will be further explained below. First, system integration and workpiece clamping are performed: the fixture and the clamping rotary device are arranged at intervals along the axis of the workpiece to be welded on the welding platform, with the clamping rotary device close to the joint end of the workpiece to be welded, and the fixture located on one side of the long suspended section of the workpiece to be welded; during clamping, the end of the workpiece to be welded (joint end) is passed sequentially through the inner hole of the bearing 3 of the fixture and the through hole of the three-jaw chuck 7 until the part to be welded extends into the welding protection chamber 8. At this time, the long suspended section of the workpiece to be welded is supported by the bearing 3, and the entire workpiece to be welded is in a state of waiting to be welded. Second, rigid fixation is implemented: the three-jaw chuck 7 is activated to clamp the rod body close to the joint end, realizing axial positioning, establishing a radial rotation reference, and shortening the cantilever length to reduce low-frequency shaking. Finally, flexible support and follow-up are implemented: For the long suspended section on the other side of the clamping point, the inner ring of bearing 3 shifts slightly with the actual position of the workpiece to be welded. This is compensated adaptively by compressing or stretching the elastic element 2 in the corresponding direction. Additional shifts caused by thermal deformation of the workpiece during welding are also absorbed by the elastic element 2. Bearing 3 allows the workpiece to be welded to rotate smoothly around its own axis at the support point, rotating synchronously with the clamping rotation device. The rotational motion of the workpiece and the radial elastic floating provided by the elastic element 2 do not interfere with each other, thus allowing the workpiece to rotate while suppressing its large-scale radial runout. This synergistic mechanism of rigid fixation and flexible follow-up ensures that the radial runout of the workpiece within the welding area is strictly limited within the allowable range of the laser welding process, guaranteeing precise and stable alignment between the laser beam and the weld, effectively avoiding defects such as incomplete penetration and poor fusion caused by large deflection. It achieves stable support and smooth rotation of the workpiece while controlling its deflection and runout.

[0038] It is understood that in this embodiment, the number of elastic elements 2 is ten. In specific applications, the number of elastic elements 2 can be flexibly set according to the specifications of the object to be welded and the support stiffness requirements. The support ring 1 can be made of engineering plastics. The mounting bracket 6 can be made of rigid metal materials. In addition, this tooling has a simple structure, few parts, low manufacturing cost, and is easy to install and maintain.

[0039] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A rotary flexible support fixture, characterized in that, include: The elastic element (2) and the bearing (3) are arranged around the circumference of the bearing to provide radial elastic support for the bearing (3), and the inner ring of the bearing (3) is used to support the workpiece to be welded and allow the workpiece to be welded to rotate about its own axis.

2. The rotary flexible support fixture according to claim 1 further includes a support ring (1), the support ring (1) and the bearing (3) are coaxially arranged, and a plurality of elastic elements (2) are arranged in the annular space between the support ring (1) and the bearing (3), and the two ends of the elastic elements (2) are respectively connected to the outer ring of the support ring (1) and the bearing (3).

3. The rotary flexible support fixture according to claim 1 further includes a mounting bracket (6), a support ring (1) fixed on the mounting bracket (6); one end of the elastic element (2) is connected to the support ring (1); the outer ring of the bearing (3) is connected to the other end of the elastic element (2), so that the bearing (3) is suspended in the inner ring of the support ring (1), and the bearing (3) can float elastically in the radial plane; the inner hole of the bearing (3) is used for the object to be welded to pass through, and the inner ring of the bearing (3) is used to form contact support for the object to be welded.

4. The rotary flexible support fixture according to claim 3, characterized in that, The supporting ring (1) is made of plastic and is fixedly connected to the top of the mounting bracket (6) by fixing bolts (5). It is used to insulate and dampen the workpiece to be welded and serves as the mounting base for the elastic element (2).

5. The rotary flexible support fixture according to claim 3, characterized in that, The mounting bracket (6) is a rigid metal bracket, which is fixedly installed on the welding platform through pre-set holes and fasteners.

6. The rotary flexible support fixture according to any one of claims 2-5, characterized in that, The outer ring of the bearing (3) is fitted with a bearing outer frame (4), and the end of the elastic element (2) away from the supporting ring (1) is connected to the bearing outer frame (4).

7. The rotary flexible support fixture according to claim 1, characterized in that, The rotating flexible support fixture is used in conjunction with the clamping rotating device. The clamping rotating device and the rotating flexible support fixture are arranged at intervals along the axial direction of the workpiece to be welded. The clamping rotating device has a through hole for the workpiece to be welded to pass through, and is used to clamp the rod of the workpiece to be welded near the joint end, and drive the workpiece to be welded to rotate around its own axis.

8. The rotary flexible support fixture according to claim 7, characterized in that, The clamping and rotating device is a three-jaw chuck (7) with a through hole.

9. The rotary flexible support fixture according to claim 7, characterized in that, It also includes a welding protection chamber (8), in which the end of the object to be welded extends into the welding protection chamber (8) after passing through the through hole of the clamping and rotating device.

10. The rotary flexible support fixture according to any one of claims 7-9, characterized in that, The number of rotating flexible support fixtures is determined according to the length of the object to be welded.

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