Welding tool for nuclear waste storage well assembly

Abstract

The invention discloses a welding tool for assembly based on a nuclear waste storage well, and relates to the technical field of welding, the welding tool comprises a supporting mechanism, the supporting mechanism is used for positioning and fixing a shaft section to be welded, and an assembly mechanism is arranged on the outer surface of the supporting mechanism; the assembling mechanism participates in the welding thermal process and is used for regulating and controlling dynamic integration and thermal-mechanical coupling response of the restraining state in the welding process. In the assembling stage, the two parent parts apply axial pressure to the middle oblique cutting structure extrusion sheet, geometric units of the oblique cutting structure extrusion sheet are promoted to be mutually nested and distributed compactly, a high-rigidity flexible supporting layer with the energy absorption characteristic is formed to absorb and homogenize local stress, meanwhile, the concave ring and the convex ring which are meshed with each other provide circumferential initial positioning and mechanical locking, and the mechanical locking effect is improved. And the wire sealing rings in the wire grooves are used for circumferential fixation, so that the welding residual tensile stress is reduced, and the initial assembly precision and the structural stability of the joint are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding, in particular to a welding tool based on nuclear waste storage well assembly. BACKGROUND

[0002] For example, the patent with the publication number CN221891267U and the name of a storage well assembly tool adopts a vertical assembly tool, which only needs to sequentially place the product components that constitute the storage well, reduces the operation difficulty of workers, reduces the number of workers required, reduces the cost, improves the storage well assembly and welding efficiency, and thus improves the product production efficiency.

[0003] However, in the narrow and deeply buried nuclear waste storage well, the rigid clamp is difficult to realize the accurate centering of the two female parts, and residual tensile stress is easily introduced due to forced assembly, which further causes welding cracking or structural deformation. Once the butt weld has defects such as incomplete welding, pores or micro-cracks, the sealing integrity of the nuclear waste storage system will be directly damaged. Therefore, the present application provides a welding tool based on nuclear waste storage well assembly to meet the needs. SUMMARY

[0004] The present application aims to provide a welding tool based on nuclear waste storage well assembly, which can effectively solve the problems raised in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a welding tool based on nuclear waste storage well assembly, comprising a supporting mechanism for positioning and fixing the well shaft segment to be welded, the outer surface of the supporting mechanism is provided with an assembly mechanism, the assembly mechanism participates in the welding heat process for adjusting the dynamic integration and thermal coupling response of the restraint state in the welding process; The upper end of the supporting mechanism is provided with a driving mechanism for annular welding, which is used to complete the continuous welding of the circumferential butt weld; The driving mechanism is internally integrated with two alignment mechanisms for assisting the stable welding of the assembly mechanism, the alignment mechanisms are used to adjust the relative position accuracy between the assembly mechanism and the base material; The inside of the driving mechanism is also provided with an extrusion mechanism for applying radial and axial extrusion force to the assembly mechanism to adjust the assembly gap between the assembly mechanism and the base material; The assembly mechanism comprises two ring pieces, the opposite surfaces of the two ring pieces are provided with concave-convex rings, and the inside of the concave-convex rings is provided with a wire slot, the two concave-convex rings are clamped with each other, and the wire slot is jointly wound with a wire sealing ring.

[0006] Two concave-convex rings are provided with a plurality of extrusion pieces arranged in a ring array on one side, the inner walls of the two ring pieces are provided with inner sealing rings, and a joint sealing flux is arranged between the two inner sealing rings; the inner walls of the two ring pieces are provided with sealing grooves, and the inner walls of the two sealing grooves are provided with flux rings.

[0007] The support mechanism comprises a support shell, the inside of the support shell is provided with a bearing seat, the two ends of the bearing seat are provided with load-bearing frames, the upper ends of the two load-bearing frames are jointly and slidably installed with support plates, the opposite surfaces of the two support plates are provided with electric push rods, and the ends of the two support plates are provided with arc plates.

[0008] The upper end of the support shell is provided with a driving motor, and the upper end of the support shell is provided with a bearing seat.

[0009] The driving mechanism comprises a bottom ring frame, the lower end of the bottom ring frame is provided with a shaft ring, and the shaft ring is installed in the inside of the bearing seat.

[0010] The inner cavity of the bottom ring frame is rotatably installed with a center rod, the outer surface of the center rod is provided with a push rod at the lower part, one end of the push rod is fixedly connected with the inner wall of the bottom ring frame, the outer surface of the center rod is provided with a center disc at the upper part, the upper end of the bottom ring frame is provided with three guide blocks arranged in a ring array, the upper ends of the guide blocks are slidably installed with sliding blocks, the three sliding blocks and the center disc are provided with connecting rods, the upper end of the center rod is provided with an angle adjustment welding gun, and the lower end of the center rod is meshed with the transmission gear of the output end of the driving motor through a transmission gear.

[0011] The extrusion mechanism comprises a support rod, the inside of the support rod is slidably installed with a mounting frame, one end of the mounting frame is provided with a spring, the inside of the mounting frame is symmetrically provided with two pressing wheels, and one end of the support rod is fixedly connected with the sliding block.

[0012] The alignment mechanism comprises an arc piece, the outer surface of the arc piece is provided with a skin, the inner wall of the skin is provided with a plurality of pressure springs arranged at equal intervals, and the arc piece is fixedly installed at one end of the sliding block.

[0013] The outer surface of the skin is provided with an arc top plate, and the outer surface of the arc top plate is provided with a pressing groove.

[0014] The pressing groove is matched with the inner wall of the inner sealing ring, and the arc top plate is arc-shaped and matched with the inner wall of the ring piece.

[0015] In summary, the technical effects and advantages of the present application are: 1. In the assembly stage, the two mother parts apply axial pressure to the middle oblique extrusion sheet, causing its geometric units to nest and become densely distributed, forming a flexible support layer with high rigidity and energy absorption characteristics to absorb and homogenize local stress. At the same time, the interlocking concave and convex rings provide circumferential initial positioning and mechanical locking, and are circumferentially fixed by the sealing ring in the groove, reducing residual tensile stress from welding and improving the initial assembly accuracy and structural stability of the joint. Secondly, in the welding stage, the flux ring in the sealing groove melts upon heating, achieving metallurgical bonding between the ring and the edge of the mother part, forming a highly reliable main sealing weld. Simultaneously, the filler flux pre-placed in the gap between the two inner sealing rings melts and wets the interface, firmly connecting them into a whole, constructing a secondary sealing barrier, and achieving double sealing protection. Finally, the high temperature of welding further melts the concave and convex rings in the interlocking state, allowing molten metal to fill their interlocking gaps, which not only significantly improves the overall strength and sealing integrity of the joint, but also significantly enhances its resistance to corrosion, radiation, and long-term creep.

[0016] 2. In this invention, the drive motor drives the center rod to rotate via gear transmission. The center rod forms a linkage structure with the bottom ring frame through the push rod, causing the bottom ring frame to rotate around the axis and drive the shaft ring to rotate smoothly inside the bearing seat, ensuring the coaxiality and stability of the entire system. The radial movement of the slider also pushes the support rod, causing the mounting frame and pressure roller to press against the surface of the ring piece and the inner sealing ring, applying a uniform radial extrusion force, which makes the ring piece fit tightly against the surface of the mother part, further eliminating assembly gaps and ensuring accurate alignment and interface fit before welding. The spring set between the support rod and the mounting frame provides a continuous reverse thrust to the pressure roller, so that the pressure roller acts on the surface of the ring piece with a constant and controllable clamping force, which not only avoids structural deformation caused by rigid overpressure, but also maintains a stable contact state under welding thermal disturbance.

[0017] 3. In this invention, the slider moves radially, causing the arc plate to move synchronously. The flexible skin drives the arc top plate to move inward, simultaneously pressing against the outer surface of the ring plate and the inner surface of the inner sealing ring. The arc top plate adopts an arc-shaped structure that matches the contour of the inner wall of the ring plate, ensuring continuous surface contact throughout the contact area, rather than point or line contact. This applies a uniform and continuous radial compressive force, effectively eliminating assembly gaps and ensuring a tight fit between the ring plate and the mother part, providing a geometric basis for high-quality welding. Secondly, the pressure spring integrated inside the skin compresses synchronously when the arc top plate is pressed, giving the entire clamping system elastic buffering capability. On the one hand, this avoids local stress concentration or even structural damage caused by over-positioning or manufacturing tolerances in traditional rigid fixtures. On the other hand, during the instantaneous thermal deformation caused by welding thermal cycles, this elastic structure can dynamically adjust the clamping force, maintain interface contact stability, and prevent defects such as incomplete penetration and porosity caused by sudden gap changes. Attached Figure Description

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 First perspective view of the welding tool for assembling the nuclear waste storage well; Figure 2 Second perspective view of the welding tool for assembling the nuclear waste storage well; Figure 3 Third perspective view of the welding tool for assembling the nuclear waste storage well; Figure 4 Perspective view of the connecting structure of the supporting mechanism; Figure 5 Sectional view of the connecting structure of the supporting mechanism; Figure 6 Perspective view of the connecting structure of the assembling mechanism; Figure 7 Sectional view of the connecting structure of the assembling mechanism; Figure 8 Perspective view of the connecting structure of the ring piece and the inner sealing ring; Figure 9 Perspective view of the connecting structure of the driving mechanism, the aligning mechanism and the extruding mechanism; Figure 10 Perspective view of the connecting structure of the driving mechanism and the aligning mechanism; Figure 11 Perspective view of the connecting structure of the driving mechanism and the extruding mechanism; Figure 12 Perspective view of the connecting structure of the extruding mechanism; Figure 13 First perspective view of the connecting structure of the aligning mechanism; Figure 14 Second perspective view of the connecting structure of the aligning mechanism.

[0020] In the figure: 1, support mechanism; 11, support shell; 12, bearing frame; 13, electric push rod; 14, support plate; 15, arc plate; 16, drive motor; 17, bearing seat; 2, assembly mechanism; 21, ring piece; 22, extrusion piece; 23, flux ring; 24, caulking flux; 25, concave-convex ring; 26, sealing ring; 27, inner sealing ring; 28, sealing groove; 29, wire groove; 3, alignment mechanism; 31, arc piece; 32, skin; 33, pressure spring; 34, arc top plate; 35, pressure groove; 4, extrusion mechanism; 41, support rod; 42, spring; 43, mounting frame; 44, pressure wheel; 5, drive mechanism; 51, angle adjustment welding gun; 52, sliding block; 53, bottom ring frame; 54, shaft ring; 55, guide block; 56, connecting rod; 57, center disc; 58, push rod; 59, center rod. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0022] Embodiment one, reference Figures 1 to 14 The welding tool shown in the figure is used for assembling a nuclear waste storage well, comprising a support mechanism 1 for positioning and fixing the well section to be welded, and an assembly mechanism 2 provided on the outer surface of the support mechanism 1, which participates in the welding heat process to regulate the dynamic integration and thermal coupling response of the restraint state during welding. The upper end of the support mechanism 1 is provided with a drive mechanism 5 for annular welding, which is used to complete the continuous welding of the circumferential butt joint; The drive mechanism 5 is internally integrated with two alignment mechanisms 3 for assisting the stable welding of the assembly mechanism 2, which is used to adjust the relative position accuracy between the assembly mechanism 2 and the base material; The drive mechanism 5 is internally provided with an extrusion mechanism 4, which is used to apply radial and axial extrusion force to the assembly mechanism 2 to adjust the assembly gap between the assembly mechanism 2 and the base material; It is worth noting that when the annular butt joint of the deep-buried pipe wall inside the nuclear waste storage well is welded, the support mechanism 1 is connected with the external mechanical arm to realize the downhole operation, and the support mechanism 1 is installed on the end effector of the high-precision mechanical arm, and the whole tool is lowered to the predetermined welding position in the well by the mechanical arm; During the welding assembly process, the assembly mechanism 2, which is set on the outer surface of the support mechanism 1, is used as a welding auxiliary structure. First, the axial advancement of the support mechanism 1 enables the assembly mechanism 2 to be initially aligned and fitted with the first mother part to be welded. Then, the second mother part to be welded is lowered from above and aligned with the other side of the assembly mechanism 2, thereby clamping the assembly mechanism 2 in the bevel area between the two mother parts. Then, the support mechanism 1 releases the assembly mechanism 2.

[0023] To ensure assembly accuracy and gap control, the drive mechanism 5 located at the upper end of the support mechanism 1 is started and runs, driving the alignment mechanism 3 and the pressing mechanism 4 integrated inside to move synchronously. The alignment mechanism 3 is used to fine adjust the relative position between the assembly mechanism 2 and the two mother parts to eliminate misalignment and angular deviation. The pressing mechanism 4 applies controllable radial or axial pressure to push the assembly mechanism 2 to undergo elastic or plastic deformation, thereby further compacting the assembly gap between the two mother parts and achieving a tight fit.

[0024] After precise alignment and gap pre-tightening are completed, the welding device inside the drive mechanism 5 is activated. This welding device is located on one side of the extrusion mechanism 4 and can perform circumferential welding on the assembly mechanism 2 under pressure. During the welding process, the assembly mechanism 2, as a functional embedded structure, achieves metallurgical bonding with the mother parts on both sides to form an integrated weld structure.

[0025] Because the extrusion mechanism 4 and the alignment mechanism 3 continuously apply extrusion pressure, they can effectively compensate for the gap changes caused by welding thermal deformation and prevent defects such as incomplete penetration, collapse or porosity.

[0026] In this system, assembly mechanism 2, acting as an intermediate centering medium, combined with the fine-tuning function of alignment mechanism 3, effectively eliminates geometric deviations such as misalignment and angular deviation between the two parent parts. At the same time, extrusion mechanism 4 applies controllable pressure to ensure uniform and stable assembly gaps. Welding is carried out under pre-tightened pressure in assembly mechanism 2. The welding device is located on one side of extrusion mechanism 4, which can perform circumferential continuous welding on the compacted area. The molten pool solidifies under constrained conditions, suppressing defects such as collapse, porosity, and incomplete penetration. Meanwhile, assembly mechanism 2, as a functional embedded component, directly participates in metallurgical bonding. Alignment mechanism 3 and extrusion mechanism 4 maintain dynamic clamping force throughout the welding process, real-time compensation for gap fluctuations caused by thermal cycling, reducing residual tensile stress and promoting the formation of beneficial residual compressive stress. Combined with the material and structural design of assembly mechanism 2, multiple long-term protection mechanisms such as micro-defect filling, composite structure evolution, and passive ion barrier are synergistically achieved. Finally, the weld not only has high strength but also excellent corrosion resistance, radiation resistance, and creep resistance.

[0027] Example 2: This example provides further technical solutions for the support mechanism 1 and the assembly mechanism 2.

[0028] The support mechanism 1 includes a support shell 11, inside which a bearing seat 17 is provided. Both ends of the bearing seat 17 are provided with load-bearing frames 12. The upper ends of the two load-bearing frames 12 are slidably mounted with a support plate 14. Electric push rods 13 are provided on the opposite surfaces of the two support plates 14. An arc plate 15 is provided at one end of the two support plates 14. Two inner sealing rings 27 are installed inside the arc plate 15.

[0029] A drive motor 16 is provided at the middle of the upper end of the support shell 11, and a bearing seat 17 is provided at the upper end of the support shell 11.

[0030] It is worth noting that by applying an external robotic arm to the bearing housing 17, it is pushed to slide axially along the inner cavity of the support shell 11. The bearing housing 17 then drives the load-bearing frame 12 to move synchronously. The load-bearing frame 12 further drives the arc plate 15 to slide through the support plate 14 connected to it. The arc plate 15 has an arc-shaped structure, and its curvature matches the inner wall contour of the assembly mechanism 2. It can fit tightly against the inner surface of the assembly mechanism 2 during the assembly process. The arc plate 15 provides circumferential support and radial positioning for the assembly mechanism 2. With the slow advancement of the robotic arm, the assembly mechanism 2 is smoothly pushed to move axially, thereby ensuring that it is precisely aligned with the mother parts to be welded on both sides, avoiding misalignment or uneven gaps. After the assembly mechanism 2 completes the docking and positioning with the two mother parts, the electric push rod 13 is activated. The electric push rod 13 drives the support plate 14 to retract radially at the upper end of the load-bearing frame 12, thereby pulling the arc plate 15 away from the inner wall of the assembly mechanism 2. At this time, the assembly mechanism 2 is no longer subject to external constraints and is independently embedded in the bevel area between the two mother parts, providing an interference-free working space for subsequent welding and ensuring that it is completely melted into the weld as a functional component.

[0031] The assembly mechanism 2 includes two ring pieces 21. Each of the two ring pieces 21 has a concave-convex ring 25 on its opposite surface. The concave-convex ring 25 has a wire groove 29 inside. The two concave-convex rings 25 are engaged with each other, and a sealing ring 26 is wrapped around the inside of the wire groove 29.

[0032] Each of the two concave and convex rings 25 has several extrusion plates 22 arranged in a ring array on one side. The inner walls of the two ring plates 21 are provided with inner sealing rings 27, and the two inner sealing rings 27 are provided with filler flux 24. The inner walls of the two ring plates 21 are provided with sealing grooves 28, and the inside of the two sealing grooves 28 is provided with flux rings 23.

[0033] During assembly, after the ring plate 21 is connected to the two side female parts, the two female parts apply axial pressure to the middle extrusion plate 22, causing it to undergo controllable plastic deformation. This is because the extrusion plate 22 is constructed using... Figure 8The oblique structure shown has geometric units of the extruded sheet 22 nested together under pressure, making their distribution more compact, thus forming a high-rigidity support layer that effectively absorbs and homogenizes the local stress generated during assembly and welding.

[0034] Meanwhile, the two female parts are provided with interlocking concave and convex rings 25 at their ends. The two parts achieve initial positioning and circumferential locking through interlocking. The interlocking structure is further circumferentially fixed by the sealing ring 26 set in the wire groove 29 to prevent assembly from loosening. The extrusion plate 22 and the concave and convex rings 25 work together to form a composite stress regulation mechanism of flexible buffering and rigid locking, which reduces welding residual tensile stress and improves the service reliability of the joint. During the subsequent welding process, the flux ring 23 pre-placed in the sealing groove 28 is heated and melted, which causes the edge of the ring 21 to achieve metallurgical bonding with the interface of the mother part, forming the main sealing weld. In addition, a small gap is reserved between the two inner sealing rings 27, which is filled with filler flux 24. During welding, the filler flux 24 melts and wets the surface of the inner sealing rings 27 on both sides, firmly connecting them into one piece to form a secondary sealing barrier. The high temperature generated by welding also partially melts through the interlocking rings 25, allowing the molten metal to fully fill the interlocking gap, achieving a dual connection of mechanical interlocking and metallurgical bonding, and enhancing the overall strength, sealing performance and resistance to long-term creep of the joint.

[0035] During the assembly stage, the two mother parts apply axial pressure to the middle oblique extrusion sheet 22, causing its geometric units to nest and become denser, forming a flexible support layer with high rigidity and energy absorption characteristics to absorb and equalize local stress. At the same time, the interlocking concave and convex rings 25 provide circumferential initial positioning and mechanical locking, and are circumferentially fixed by the sealing ring 26 in the groove 29, reducing welding residual tensile stress and improving the initial assembly accuracy and structural stability of the joint. Secondly, during the welding stage, the flux ring 23 in the sealing groove 28 is heated and melted, realizing the metallurgical bonding between the ring 21 and the edge of the mother piece, forming a highly reliable main sealing weld. At the same time, the filler flux 24 pre-placed in the gap between the two inner sealing rings 27 melts and wets the interface, firmly connecting them into a whole, constructing a secondary sealing barrier, and achieving double sealing protection. Finally, the high temperature of welding further partially melts through the interlocking concave and convex rings 25, allowing the molten metal to fill its meshing gap, which not only greatly improves the overall strength and sealing integrity of the joint, but also significantly enhances its resistance to corrosion, radiation and long-term creep.

[0036] Example 3: This example provides a further technical solution for the drive mechanism 5 and the extrusion mechanism 4.

[0037] The drive mechanism 5 includes a bottom ring frame 53, and a collar 54 is provided at the lower end of the bottom ring frame 53. The collar 54 is installed inside the bearing housing 17.

[0038] A central rod 59 is rotatably mounted in the middle of the inner cavity of the bottom ring frame 53. A push rod 58 is provided on the lower part of the outer surface of the central rod 59, and one end of the push rod 58 is fixedly connected to the inner wall of the bottom ring frame 53. A central disk 57 is sleeved on the upper part of the outer surface of the central rod 59. Three guide blocks 55 arranged in a ring array are provided at the upper end of the bottom ring frame 53, and sliders 52 are slidably mounted on the upper end of each guide block 55. A connecting rod 56 is provided between each of the three sliders 52 and the central disk 57. An angle adjustment welding torch 51 is provided at the upper end of the central rod 59, and the lower end of the central rod 59 meshes with the transmission gear at the output end of the drive motor 16 through a transmission gear.

[0039] It is worth noting that after the assembly mechanism 2 completes the docking with the two female parts to be welded, the push rod 58 pushes the center rod 59 to rotate inside the bottom ring frame 53. The rotation of the center rod 59 drives the center disk 57, which is fixedly connected to it, to rotate synchronously. The center disk 57 converts the rotational motion into radial thrust through multiple sets of connecting rods 56, driving the slider 52 to slide outward along the outer surface of the guide block 55. The radial movement of slider 52 further pushes the extrusion mechanism 4 and the alignment mechanism 3 to unfold synchronously, so that they press against the outer surfaces of ring 21 and inner sealing ring 27 respectively, thereby achieving circumferential pressing and precise positioning of assembly mechanism 2, effectively eliminating assembly gaps and preventing displacement during welding. At the same time, angle adjustment welding gun 51 is installed on the upper end of center rod 59. When center rod 59 rotates, angle adjustment welding gun 51 moves around the circumference and dynamically approaches one side of extrusion mechanism 4 through its own angle adjustment mechanism. The aforementioned rotational action is powered by the drive motor 16. The output shaft of the drive motor 16 is equipped with a drive gear that meshes with the driven gear at the lower end of the center rod 59, thereby driving the center rod 59 to rotate. The center rod 59 forms a linkage structure with the bottom ring frame 53 through the push rod 58. When the center rod 59 rotates, the push rod 58 synchronously drives the bottom ring frame 53 to rotate around the axis, and the bottom ring frame 53 in turn drives the shaft ring 54 to rotate smoothly inside the bearing seat 17.

[0040] The extrusion mechanism 4 includes a support rod 41, an installation frame 43 is slidably mounted inside the support rod 41, and a spring 42 is provided at one end of the installation frame 43. Two pressure rollers 44 are symmetrically arranged inside the installation frame 43. One end of the support rod 41 is fixedly connected to the slider 52.

[0041] It is worth noting that when the slider 52 slides outward, it pushes the support rod 41 to move synchronously. The support rod 41 then drives the mounting frame 43 to move radially, so that the pressure roller 44 mounted on it presses against the outer surface of the ring piece 21 and the inner sealing ring 27. Through the radial extrusion force applied by the pressure roller 44, the ring piece 21 is made to fit tightly against the surface of the mother part, eliminating assembly gaps and ensuring accurate alignment and interface bonding before welding. In addition, a spring 42 is provided between the support rod 41 and the mounting frame 43. The spring 42 provides a continuous reverse thrust to the mounting frame 43, so that the pressure roller 44 always acts on the surface of the ring piece 21 with a constant and controllable clamping force, which not only avoids structural deformation due to rigid overpressure, but also ensures that a stable contact state can be maintained under welding thermal disturbance.

[0042] During the assembly stage, the push rod 58 pushes the center rod 59 to rotate inside the bottom ring frame 53, causing the center disk 57 to rotate synchronously. The rotational motion is converted into radial thrust through multiple sets of connecting rods 56, which drives the slider 52 to slide outward along the guide block 55. This pushes the extrusion mechanism 4 and the alignment mechanism 3 to unfold, so that they press against the outer surfaces of the ring piece 21 and the inner sealing ring 27 respectively, thereby achieving circumferential pressing and precise positioning of the assembly mechanism 2, eliminating assembly gaps and preventing displacement during welding. Secondly, in terms of power transmission, the drive motor 16 drives the center rod 59 to rotate through gear transmission. The center rod 59 forms a linkage structure with the bottom ring frame 53 through the push rod 58, so that the bottom ring frame 53 rotates around the axis and drives the shaft ring 54 to rotate smoothly inside the bearing seat 17, ensuring the coaxiality and stability of the entire system. The radial movement of the slider 52 also pushes the support rod 41, causing the mounting frame 43 and the pressure roller 44 to press against the surface of the ring piece 21 and the inner sealing ring 27, applying a uniform radial extrusion force, so that the ring piece 21 is tightly attached to the surface of the mother part, further eliminating the assembly gap, ensuring accurate alignment and interface contact before welding. The spring 42 set between the support rod 41 and the mounting frame 43 provides a continuous reverse thrust to the pressure roller 44, so that the pressure roller 44 acts on the surface of the ring piece 21 with a constant and controllable clamping force, which not only avoids structural deformation caused by rigid overpressure, but also maintains a stable contact state under welding thermal disturbance.

[0043] Example 4: This example provides a further technical solution for the alignment mechanism 3.

[0044] The alignment mechanism 3 includes an arc plate 31, the outer surface of which is provided with a skin 32, and the inner wall of the skin 32 is provided with a number of pressure springs 33 distributed at equal intervals. The arc plate 31 is fixedly installed at one end of the slider 52.

[0045] The outer surface of the skin 32 is provided with an arc-shaped top plate 34, and the outer surface of the arc-shaped top plate 34 is provided with a pressure groove 35.

[0046] The pressure groove 35 fits into the inner wall of the inner sealing ring 27, and the arc-shaped top plate 34 is arc-shaped to fit into the inner wall of the ring piece 21.

[0047] It is worth noting that during the radial movement of the slider 52, the arc plate 31 is moved synchronously. The arc plate 31 drives the arc top plate 34 to move inward through the flexible skin 32, so that it presses against the outer surface of the ring plate 21 and the inner surface of the inner sealing ring 27 respectively. The arc top plate 34 has an arc-shaped structure, and its curvature matches the inner wall contour of the ring plate 21. It can achieve surface contact and continuously apply uniform radial extrusion force during the assembly process, ensuring that the ring plate 21 and the mother part fit tightly and effectively control the welding gap. Furthermore, the skin 32 integrates a pressure spring 33. When the arc top plate 34 is subjected to external extrusion force, the skin 32 undergoes controllable elastic deformation, and the pressure spring 33 is compressed accordingly, providing buffering and reaction force adjustment functions. This not only avoids local stress concentration caused by rigid contact, but also dynamically maintains the clamping force during welding thermal deformation.

[0048] When the slider 52 moves radially, it drives the arc plate 31 to move synchronously. The flexible skin 32 drives the arc top plate 34 to move inward, so that it simultaneously presses against the outer surface of the ring plate 21 and the inner surface of the inner sealing ring 27. The arc top plate 34 adopts an arc-shaped structure that matches the inner wall contour of the ring plate 21, ensuring continuous surface contact in the entire contact area, rather than point or line contact, thereby applying uniform and continuous radial extrusion force, effectively eliminating assembly gaps, ensuring tight fit between the ring plate 21 and the mother part, and providing a geometric basis for high-quality welding. Secondly, the pressure spring 33 integrated inside the skin 32 is compressed synchronously when the top plate 34 is pressed, giving the entire clamping system elastic buffering capability. On the one hand, this avoids local stress concentration or even structural damage caused by over-positioning or manufacturing tolerances in traditional rigid fixtures. On the other hand, during the instantaneous thermal deformation caused by welding thermal cycles, this elastic structure can dynamically adjust the clamping force, maintain the stability of interface contact, and prevent defects such as incomplete penetration and porosity caused by sudden gap changes.

[0049] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding tooling based on a nuclear waste storage well assembly, characterized by: The application relates to a support mechanism (1) for positioning and fixing well shaft segments to be welded, wherein the outer surface of the support mechanism (1) is provided with an assembling mechanism (2) participating in a welding thermal process for regulating the dynamic integration and thermal coupling response of the restraint state in the welding process. The upper end of the support mechanism (1) is provided with a driving mechanism (5) for annular welding, which is used for completing continuous welding of circumferential butt welds. The driving mechanism (5) is internally integrated with two alignment mechanisms (3) for assisting the stable welding of the assembling mechanism (2), which are used for adjusting the relative position accuracy between the assembling mechanism (2) and base material. The internal part of the driving mechanism (5) is further provided with an extrusion mechanism (4) for applying radial and axial extrusion force to the assembling mechanism (2) to adjust the assembly gap between the assembling mechanism (2) and base material. The assembling mechanism (2) comprises two ring pieces (21), the opposite surfaces of the two ring pieces (21) are provided with concave-convex rings (25), the internal parts of the concave-convex rings (25) are provided with wire grooves (29), the two concave-convex rings (25) are clamped with each other, and the internal parts of the wire grooves (29) are jointly provided with wire sealing rings (26).

2. The welding tooling for a nuclear waste storage well assembly of claim 1, wherein: One side of the two concave-convex rings (25) is provided with a plurality of extrusion pieces (22) arranged in a ring array, the inner walls of the two ring pieces (21) are provided with inner sealing rings (27), the two inner sealing rings (27) are jointly provided with jointing flux (24), the inner walls of the two ring pieces (21) are provided with sealing grooves (28), and the internal parts of the two sealing grooves (28) are provided with flux rings (23).

3. The welding tooling for use in assembling a nuclear waste storage well according to claim 2, wherein: The support mechanism (1) comprises a support shell (11), the internal part of the support shell (11) is provided with a bearing seat (17), the two ends of the bearing seat (17) are provided with bearing frames (12), the upper ends of the two bearing frames (12) are jointly and slidably installed with support plates (14), the opposite surfaces of the two support plates (14) are provided with electric push rods (13), one end of the two support plates (14) is provided with arc plates (15), and the two inner sealing rings (27) are installed in the internal parts of the arc plates (15).

4. The welding tooling assembly of claim 3, wherein: The upper middle part of the support shell (11) is provided with a driving motor (16), and the upper end of the support shell (11) is provided with a bearing seat (17).

5. A welding tooling assembly for use in the fabrication of a nuclear waste storage well according to claim 4, wherein: The driving mechanism (5) comprises a bottom ring frame (53), the lower end of the bottom ring frame (53) is provided with a shaft ring (54), and the shaft ring (54) is installed in the internal part of the bearing seat (17).

6. A welding tooling assembly for use in connection with a nuclear waste storage well as defined in claim 5, wherein: The inner cavity of the bottom ring frame (53) is rotationally installed with a center rod (59), the outer surface of the lower part of the center rod (59) is provided with a push rod (58), one end of the push rod (58) is fixedly connected with the inner wall of the bottom ring frame (53), the outer surface of the upper part of the center rod (59) is sleeved with a center disc (57), the upper end of the bottom ring frame (53) is provided with three guide blocks (55) arranged in an annular array, the upper end of each guide block (55) is slidingly installed with a sliding block (52), a connecting rod (56) is arranged between each of the three sliding blocks (52) and the center disc (57), the upper end of the center rod (59) is provided with an angle adjustment welding gun (51), and the lower end of the center rod (59) is engaged with the transmission gear of the output end of the driving motor (16) through a transmission gear.

7. The welding tooling assembly of claim 1, wherein: The extrusion mechanism (4) comprises a supporting rod (41), a mounting frame (43) is slidingly installed inside the supporting rod (41), one end of the mounting frame (43) is provided with a spring (42), two pressing wheels (44) are symmetrically arranged inside the mounting frame (43), and one end of the supporting rod (41) is fixedly connected with the sliding block (52).

8. The welding tooling assembly of claim 1, wherein: The alignment mechanism (3) comprises an arc piece (31), the outer surface of the arc piece (31) is provided with a skin (32), the inner wall of the skin (32) is provided with a plurality of pressure springs (33) distributed at equal intervals, and the arc piece (31) is fixedly installed at one end of the sliding block (52).

9. A welding tooling assembly for use in connection with a nuclear waste storage well as defined in claim 8, wherein: The outer surface of the skin (32) is provided with an arc top plate (34), and the outer surface of the arc top plate (34) is provided with a pressing groove (35).

10. The welding tooling assembly of claim 9, wherein: The pressing groove (35) is in close contact with the inner wall of the inner sealing ring (27), and the arc top plate (34) is arc-shaped and used for being in close contact with the inner wall of the ring piece (21).

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