Nuclear fuel assembly framework assembling, welding and expanded connection integrated platform

Abstract

The invention discloses a nuclear fuel assembly framework assembling, welding and expanded connection integrated platform which comprises a base, a platform body, an expansion gun clamping frame, an expanded connection positioning plate clamping frame, a grillwork clamping frame and a lower pipe base clamping frame. The platform body is fixed to the base, and a first linear guide rail is arranged on the upper surface of the platform body; the clamping frames are all arranged on a first linear guide rail, the clamping frames except the expanded connection positioning plate clamping frame are all provided with positioning sliding blocks, the expanded connection positioning plate clamping frame comprises a first sliding table plate, and a limiting column is arranged on the side, close to the expansion gun clamping frame in the axial direction, of the first sliding table plate. The expanded connection positioning plate clamping frame can freely move in the axial direction in the expanded connection process. According to the integrated platform, integrated layout of various types of clamping frames is achieved, the various types of clamping frames are assembled on the linear guide rails of the same platform, and integrated operation of framework assembly welding and expanded connection is achieved.

Description

Technical Field

[0001] This application relates to the field of nuclear fuel assembly processing, and more particularly to an integrated platform for assembling, welding and expanding a nuclear fuel assembly skeleton. Background Technology

[0002] The framework is an important component of nuclear fuel assemblies, mainly composed of components such as grids, guide tubes, and lower tube seats, which are assembled and welded together. During manufacturing, the components are first assembled on a specially designed platform, then welding clamps are used manually to weld the grids and guide tubes together, and finally, the guide tubes are expanded and joined using a tube expansion forming process to form the framework.

[0003] Existing technology CN105773025B discloses a manufacturing, assembly, and welding platform for a hexagonal high-fuel-consumption fuel assembly frame, including a lower grid plate fixing device, several positioning grid fixing devices, a frame flatness adjustment device, and a working platform. The lower grid plate fixing device is fixed to the right end of the working platform, and the frame flatness adjustment device is fixed to the left end of the working platform. The positioning grid fixing devices are installed sequentially from right to left between the lower grid plate fixing device and the frame flatness adjustment device on the working platform. The positioning grid fixing devices are coaxial, and their positions on the working platform can be arbitrarily adjusted along the axial direction. This solution fails to solve the problems of cumbersome technical debugging and the lack of a common reference between the expansion joint device and the frame platform.

[0004] Existing technology CN107160021A discloses a dual-station automatic spot welding device for a skeleton, including an expansion mandrel device, a skeleton assembly platform, a floating welding torch, and a two-dimensional cable tray. The floating welding torch is mounted on the two-dimensional cable tray. The skeleton assembly platform is positioned below the two-dimensional cable tray along a left-right direction. An expansion device is located on the skeleton assembly platform near the edge of the two-dimensional cable tray, and an expansion mandrel device is located at the end of the expansion device. The expansion mandrel device and the skeleton assembly platform are aligned, and the expansion mandrel device extends beyond the two-dimensional cable tray. This solution fails to solve the problems of cumbersome technical debugging and the lack of a common reference point between the expansion device and the skeleton platform.

[0005] In summary, neither of the two existing technologies mentioned above has solved the problems of cumbersome technical debugging and the lack of a common reference between the expansion joint device and the skeleton platform. Summary of the Invention

[0006] The purpose of this application is to solve the aforementioned technical problems.

[0007] To achieve the above objectives, this application proposes an integrated platform for nuclear fuel assembly skeleton assembly, welding, and expansion, comprising a base, a platform, an expansion gun clamping frame, an expansion positioning plate clamping frame, a grid clamping frame, and a lower tube seat clamping frame. The platform is fixed on the base, and a first linear guide rail is provided on the upper surface of the platform. The expansion gun clamping frame, the expansion positioning plate clamping frame, the grid clamping frame, and the lower tube seat clamping frame are all disposed on the first linear guide rail. Each of the expansion gun clamping frame, the grid clamping frame, and the lower tube seat clamping frame is provided with a positioning slider, which is used to fix the expansion gun clamping frame, the grid clamping frame, and the lower tube seat clamping frame. The expansion positioning plate clamping frame includes a first sliding plate, and the first sliding plate is provided with a limit post on the side axially close to the expansion gun clamping frame. The expansion positioning plate clamping frame can move freely axially during the expansion process.

[0008] Furthermore, the surface of the limiting post has threads, and the first slide plate is provided with a threaded limiting hole on one side of the expansion gun clamping frame along the axial direction. The limiting post and the limiting hole are fixed by threads. The exposed length of the limiting post can be adjusted by rotation. The other end of the limiting post has a first magnetic element, and the corresponding position of the slide plate of the expansion gun clamping frame has a second magnetic element. The first magnetic element and the second magnetic element can be attracted together, and the maximum attraction between the first magnetic element and the second magnetic element is 5N.

[0009] Furthermore, the grid clamping frame includes a second sliding plate, a U-shaped frame, and a first movable beam. The second sliding plate has first sliders on both sides below it, and the first sliders are mounted on the first linear guide rail. The U-shaped frame is fixed above the first sliding plate, and the first movable beam is located at the opening of the U-shaped frame. A first grid pressure plate is located below the first movable beam.

[0010] Furthermore, a grid positioning plate is provided on the bottom surface and one side surface of the inner side of the U-shaped frame, and a second grid pressure plate is provided on the other side surface of the inner side of the U-shaped frame. An axial positioning block is provided on the side of the U-shaped frame close to the lower tube seat clamping frame along the axial direction, and the axial positioning block has a first positioning hole along the axial direction at one end along the radial inner side of the skeleton.

[0011] Furthermore, the platform is provided with a second linear guide rail and a grating ruler on its side. The second linear guide rail is provided with a grating ruler reading head. The grating ruler reading head is provided with a connecting plate. The grating ruler reading head is connected to one of the expansion gun clamping frame, the expansion joint positioning plate clamping frame, the grid clamping frame, and the lower tube seat clamping frame through the connecting plate. The connecting plate is provided with a second slider on the radial inner side of the skeleton. The second slider is provided on the second linear guide rail.

[0012] Furthermore, the lower tube seat clamping frame includes a third slide plate, a frame, a positioning plate, a pressure plate, a second movable beam, a third movable beam, and a stiffening plate. The frame is provided with a second positioning hole along the axial direction along the radial inner side of the skeleton. The stiffening plate is provided on the side of the frame away from the expansion gun clamping frame. The side of the frame near the expansion gun clamping frame includes an L-shaped component. The bottom and side surfaces of the L-shaped component along the radial inner side of the skeleton are provided with positioning plates. The second movable beam and the third movable beam are respectively connected to the frame.

[0013] Furthermore, an anti-rotation post is provided between the axial positioning block and the U-shaped frame. The anti-rotation post has a first disk and a second disk. The first disk and the second disk are connected by three first pins evenly distributed along the circumference of the first disk. Two second pins are provided on the side of the second disk away from the first disk along the axial direction. The axial positioning block is provided with pin holes corresponding to the second pins.

[0014] Furthermore, a locking pin is provided on the side of the second slide plate near the lower tube seat clamping frame. The lower end of the locking pin has a thread, and the positioning slider is provided with a pin hole corresponding to the locking pin. The locking pin is connected to the positioning slider through the thread.

[0015] Furthermore, the second grid plate is provided with a fixing pin, which has threads. The second grid plate is connected to the U-shaped frame through the fixing pin, and the extension length of the second grid plate towards the radial inward side of the frame is set by rotating the fixing pin.

[0016] By applying the above-described technical solution of the present invention, at least the following technical effects are achieved:

[0017] 1. This platform achieves an integrated layout of various types of clamping frames, assembling them onto the linear guide rails of the same platform. This facilitates the adjustment of the relative positions between the clamping frames, enabling integrated operations of skeleton assembly, welding, and expansion, resulting in higher dimensional accuracy of the manufactured skeleton.

[0018] 2. The platform's clamping frame movement adopts a precision linear guide rail and slider design, which provides high positioning accuracy, convenient movement, and easy adjustment of the clamping frame's position.

[0019] 3. The platform is equipped with a grating ruler, which accurately measures the coordinates of each clamping frame and precisely controls the spacing between them. At the same time, the grating ruler can display the current position coordinate value in real time, avoiding the tedious operation of adjusting and measuring while using vernier calipers.

[0020] 4. The lattice clamping frame of this platform has a compatible design, which is compatible with the manufacturing needs of various types of skeletons, realizing a universal platform and reducing investment costs.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 A structural diagram of an integrated platform for assembling, welding, and expanding a nuclear fuel assembly skeleton, according to one embodiment, is provided.

[0024] Figure 2 A structural diagram of the platform in one embodiment is presented;

[0025] Figure 3 A cross-sectional schematic diagram of the platform in one embodiment is shown;

[0026] Figure 4 A structural diagram of a grid clamping frame in one embodiment is shown;

[0027] Figure 5 A structural diagram of the anti-rotation structure of the axial positioning block in one embodiment is shown;

[0028] Figure 6 A structural diagram of the anti-rotation column in one embodiment is shown;

[0029] Figure 7 A structural diagram showing the connection between the grating ruler and the grid clamping frame in one embodiment is provided;

[0030] Figure 8 A structural diagram of the grid clamping frame fixing method in one embodiment is shown;

[0031] Figure 9 A structural diagram of the lower tube seat clamping frame in one embodiment is shown;

[0032] Figure 10 A structural diagram of the frame in the lower tube seat clamping frame of one embodiment is shown;

[0033] Figure 11 A structural diagram of the expansion joint positioning plate clamping frame in one embodiment is shown;

[0034] Figure 12 A structural diagram of the first slide plate in the expansion joint positioning plate clamping frame of one embodiment is shown;

[0035] Figure 13 A structural diagram of the limiting post in the clamping frame of the expansion joint positioning plate in one embodiment is shown.

[0036] Reference numerals: 1. Base; 2. Platform; 3. Expansion gun clamping frame; 4. Expansion positioning plate clamping frame; 401. First slide plate; 402. Limiting post; 403. Third slider; 5. Grid clamping frame; 501. Second slide plate; 502. U-shaped frame; 503. First movable beam; 504. First slider; 505. First grid pressure plate; 506. Grid positioning plate; 507. Axial positioning block; 508. Anti-rotation post; 509. First disc; 510. Second disc; 511. First pin; 512. Second pin 513. First positioning hole; 514. Locking pin; 515. Fixing pin; 516. Second grid pressure plate; 6. Lower tube seat clamping frame; 601. Third slide plate; 602. Frame; 603. Positioning plate; 604. Pressure plate; 605. Second movable beam; 606. Third movable beam; 607. Rib plate; 608. Second positioning hole; 609. L-shaped component; 7. First linear guide rail; 8. Positioning slider; 9. Second linear guide rail; 10. Grating ruler; 11. Grating ruler reading head; 12. Connecting plate; 13. Second slider. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] The present invention will be further described in detail below with reference to specific embodiments, which should not be construed as limiting the scope of protection claimed by the present invention.

[0039] Example

[0040] According to one aspect of the present invention, an integrated platform for assembling, welding and expanding nuclear fuel assembly skeletons is provided.

[0041] like Figure 1 The diagram shows a structural diagram of an integrated platform for assembling, welding, and expanding a nuclear fuel assembly skeleton according to an embodiment of the present invention. The integrated platform includes a base 1, a platform 2, an expansion gun clamping frame 3, an expansion positioning plate clamping frame 4, a grid clamping frame 5, and a lower tube seat clamping frame 6. The platform 2 is fixed on the base 1. A first linear guide rail 7 is provided on the upper surface of the platform 2. The expansion gun clamping frame 3, the expansion positioning plate clamping frame 4, the grid clamping frame 5, and the lower tube seat clamping frame 6 are all provided on the first linear guide rail 7. The expansion gun clamping frame 3, the grid clamping frame 5, and the lower tube seat clamping frame 6 are all provided with positioning sliders 8. The positioning sliders 8 are used to fix the expansion gun clamping frame 3, the grid clamping frame 5, and the lower tube seat clamping frame 6. The expansion positioning plate clamping frame 4 includes a first sliding plate 401. The first sliding plate 401 is provided with a limit post 402 on the side of the first sliding plate 401 that is close to the expansion gun clamping frame 3 along the axial direction. The expansion positioning plate clamping frame 4 can move freely along the axial direction during the expansion process.

[0042] Furthermore, base 1, the load-bearing carrier of this integrated platform, is a welded component made of carbon steel, assembled and welded from a base plate, support plate, and reinforcing ribs. After welding, it undergoes aging stress-relieving treatment to prevent deformation over long-term use, and is painted to prevent rust. The base plate is placed on the ground and secured to it with anchor bolts. Platform 2 rests on the support plate. To facilitate adjustment of the level of platform 2, adjusting bolts are provided on both sides of the support plate. The level of platform 2 is adjusted by adjusting the degree to which these bolts are raised. Once the level is satisfactory, the platform 2 is secured to the support plate with tightening bolts. This integrated platform includes five bases, evenly distributed under platform 2, serving to fix and support it, preventing platform 2 from deforming under heavy pressure.

[0043] Furthermore, such as Figure 2 , Figure 3 As shown, platform 2 is a hollow cuboid made of carbon steel. After casting, it undergoes aging treatment to relieve stress, and then the datum surface is precision machined to achieve a certain level of accuracy. The datum surface serves as the assembly reference for the entire device. Threaded holes are drilled along the entire length of the datum surface on both sides and in the middle for assembling linear guides and clamping frames, respectively. Threaded holes are also drilled along the entire length of the side surface of platform 2 for assembling linear guides. Threaded holes are drilled along the entire length of the bottom surface of platform 2 for connecting to base 1.

[0044] Furthermore, the grid clamping frame 5 includes a second sliding plate 501, a U-shaped frame 502, and a first movable beam 503. The second sliding plate 501 has first sliders 504 on both sides below it, and the first sliders 504 are mounted on the first linear guide rail 7. The U-shaped frame 502 is fixed above the second sliding plate 501. The first movable beam 503 is located at the opening of the U-shaped frame 502, and a grid pressure plate 505 is located below the first movable beam 503.

[0045] Specifically, in this embodiment, such as Figure 4 As shown, two first sliders 504 are respectively mounted on both sides of the second slide plate 501. The U-shaped frame 502 is mounted on the second slide plate 501. To ensure the assembly accuracy of the U-shaped frame 502, a square pin is embedded between the assembly surfaces of the second slide plate 501 and the U-shaped frame 502. The first movable beam 503 is mounted at the opening of the U-shaped frame 502 by two pins. By removing one of the pins, the first movable beam 503 can rotate around the other pin to open the U-shaped frame 502. Below the first movable beam 503, the first grid pressure plate 505 is connected to it by bolts. Guide pins are mounted on both sides of the first grid pressure plate 505. The guide pins are inserted into the holes at both ends of the first movable beam 503 to prevent the grid pressure plate from rotating.

[0046] Furthermore, a grid positioning plate 506 is provided on the bottom surface and one side surface of the inner side of the U-shaped frame 502, and a second grid pressure plate 516 is provided on the other side surface of the inner side of the U-shaped frame 502. An axial positioning block 507 is provided on the side of the U-shaped frame 502 that is close to the lower tube seat clamping frame 6 along the axial direction. The axial positioning block 507 has a first positioning hole 513 along the axial direction at one end along the radial inner side of the frame.

[0047] Furthermore, the second grid plate 516 is provided with a fixing pin 515, which has threads. The second grid plate 516 is connected to the U-shaped frame 502 through the fixing pin 515. The extension length of the second grid plate 516 towards the radial inward side of the frame is set by the rotation of the fixing pin 515.

[0048] Specifically, in this embodiment, such as Figure 4 As shown, the U-shaped frame 502 has three inner surfaces. The bottom surface and one side surface of the inner surface of the U-shaped frame 502 are designed with bosses. These two surfaces are reference surfaces. Two grid positioning plates 506 are respectively assembled on these two reference surfaces. The second grid pressure plate 516 on the other side is connected to it by a fixing pin. Guide pins are assembled on both sides of the second grid pressure plate 516. The back of the U-shaped frame is a reference surface. An axial positioning block 507 is assembled at each of the four corners as a reference for grid installation and positioning.

[0049] Furthermore, in order to reduce the weight of the clamping frame and meet the requirements for nuclear fuel element contact material management, components that do not directly contact the grid, such as the U-shaped frame 502, the second sliding plate 501, and the first movable beam 503, are made of high-strength aluminum alloy, while the remaining components that contact the grid are made of high-quality stainless steel.

[0050] Furthermore, an anti-rotation post 508 is provided between the axial positioning block 507 and the U-shaped frame 502. The anti-rotation post 508 has a first disk 509 and a second disk 510. The first disk 509 and the second disk 510 are connected by three first pins 511 evenly distributed along the circumference of the first disk 509. Two second pins 512 are provided on the side of the second disk 510 away from the first disk 509 along the axial direction. The axial positioning block 507 is provided with pin holes corresponding to the second pins 512.

[0051] Specifically, in this embodiment, such as Figure 5 , Figure 6 As shown, the axial positioning block 507 is positioned by the second pin 512 on the anti-rotation column 508. Through structural design, after assembly, the two second pins 512 on the anti-rotation column 508 are arranged vertically, while the pin holes on the axial positioning block 507 are arranged perpendicular to the horizontal direction. After the pin holes and the second pins 512 are engaged, the axial positioning block 507 can be kept in a horizontal state and then tightened with bolts and nuts.

[0052] Furthermore, a second linear guide rail 9 and a grating ruler 10 are provided on the side of the platform 2. A grating ruler reading head 11 is provided on the second linear guide rail 9. A connecting plate 12 is provided on the grating ruler reading head 11. The grating ruler reading head 11 is connected to one of the expansion gun clamping frame 3, the expansion positioning plate clamping frame 4, the grid clamping frame 5, and the lower tube seat clamping frame 6 through the connecting plate 12. A second slider 13 is provided on the connecting plate 12 along the radial inner side of the skeleton. The second slider 13 is provided on the second linear guide rail 9.

[0053] Specifically, in this embodiment, such as Figure 7 As shown, a straight hole is designed on the lower side of the U-shaped frame 502 for connecting to the grating ruler reading head 11 mounted on the second linear guide rail 9 on the side of the platform 2. The grating ruler reading head 11 is fixed on the connecting plate 12, which is fixed on the second slider 13. The upper part of the connecting plate 12 has holes, and pins are inserted into the two holes to connect the connecting plate 12 to the U-shaped frame 502.

[0054] When the clamping frame moves, the grating ruler reading head moves accordingly. In use, the grating ruler reading head is connected to an external digital display to display the coordinate values ​​of the clamping frame in real time.

[0055] Furthermore, a locking pin 514 is provided on the side of the second slide plate 501 near the lower tube seat clamping frame 6. The lower end of the locking pin 514 has threads, and the positioning slider 8 is provided with a pin hole corresponding to the locking pin 514. The locking pin 514 is connected to the positioning slider 8.

[0056] Specifically, in this embodiment, such as Figure 8 As shown, when it is necessary to fix the grid clamping frame 5, first use bolts to fix the positioning slider 8 on the platform 2, then insert the threaded locking pin 514 into the pin hole on the second slide plate 501, move the clamping frame left and right until the thread can be easily screwed into the pin hole on the positioning slider 8, and the grid clamping frame 5 can be fixed.

[0057] Furthermore, such as Figure 9 , Figure 10 As shown, the lower tube seat clamping frame 6 includes a third slide plate 601, a frame 602, a positioning plate 603, a pressure plate 604, a second movable beam 605, a third movable beam 606, and a stiffening plate 607. The frame 602 is provided with a second positioning hole 608 along the axial direction on the radial inner side of the skeleton. The stiffening plate 607 is provided on the side of the frame 602 away from the expansion gun clamping frame 3. The side of the frame 602 near the expansion gun clamping frame 3 includes an L-shaped component 609. The bottom and side surfaces of the L-shaped component 609 along the radial inner side of the skeleton are provided with positioning plates 603. The second movable beam 605 and the third movable beam 606 are respectively connected to the frame 602.

[0058] The lower tube seat clamping frame adopts a frame and double movable beam design, eliminating the axial positioning block and integrating the axial positioning function into the frame. At the same time, support ribs are designed to position the lower tube seat during assembly. This is because a large torque needs to be applied to position the lower tube seat during assembly, and the strength may be insufficient if a positioning block design is used.

[0059] Furthermore, the limiting post 402 has threads on its surface, and the first slide plate 401 is provided with a threaded limiting hole on the side of the expansion gun clamping frame 3 along the axial direction. The limiting post 402 is fixed to the limiting hole by threads. The exposed length of the limiting post 402 can be adjusted by rotation. The other end of the limiting post 402 has a first magnetic element, and the corresponding position of the slide plate of the expansion gun clamping frame 3 has a second magnetic element. The first magnetic element and the second magnetic element can be attracted together, and the maximum attraction between the first magnetic element and the second magnetic element is 5N.

[0060] The maximum suction force of 5N can overcome the friction between the expansion joint positioning plate clamping frame and the linear guide rail, while being as small as possible, so that the expansion joint positioning plate clamping frame can float freely when the expansion joint contracts.

[0061] Before expansion, the first and second magnetic components automatically attract each other. During expansion, the workpiece contracts, causing the expansion positioning plate clamping frame to float freely under the action of contraction force. The floating of the expansion positioning plate clamping frame completely releases the expansion tensile stress, ensuring that the expansion interface always maintains a uniform clamping force and improving the expansion quality.

[0062] Specifically, in this embodiment, such as Figure 11 , Figure 12 and Figure 13 As shown, the expansion joint positioning plate clamping frame 4 adopts a single slider design. The first slide plate 401 is narrow and has no pin hole. At the same time, an adjustable length limit post 402 is installed on the first slide plate to adjust the distance between the expansion joint positioning plate clamping frame and the expansion gun clamping frame. The expansion joint positioning plate clamping frame cannot be fixed to the platform. When the workpiece shrinks during expansion, the expansion joint positioning plate clamping frame floats freely under the action of the shrinkage force.

[0063] The expansion joint positioning plate is fixed in the clamping frame, which is limited by two high-precision linear guides on the left and right, and there is a slider on each side. When the expansion joint contracts, the expansion joint positioning plate can only move along the guide rail direction, which will not cause the expansion joint positioning plate to tilt, thus ensuring good parallelism between the expansion joint end face and the bottom surface of the lower tube seat.

[0064] For the aforementioned integrated platform for assembling, welding, and expanding nuclear fuel assembly skeletons, the spacing between the clamping frames must first be adjusted according to the skeleton drawings. The specific adjustment method is as follows:

[0065] (1) First, fix the lower tube holder clamping frame to the end of the platform, connect the grating ruler reading head to the straight hole on the lower tube holder clamping frame through the connecting plate and the pin, connect the grating ruler digital display instrument, and set the displayed coordinate value to zero.

[0066] (2) Remove the pin, move the grating ruler reading head to the first layer grid clamping frame, insert the pin into the straight hole of the first layer grid clamping frame, slowly move the first layer grid clamping frame until the coordinate value displayed by the grating ruler digital display is consistent with the drawing, and then fix the first layer grid clamping frame.

[0067] (3) Following step (2), adjust and fix the position of the remaining grid clamping frames layer by layer.

[0068] After adjusting the spacing of the lattice clamping frames, proceed with the assembly and welding of the skeleton. After welding, perform skeleton expansion joints. Before expansion joints, the positions of the expansion joint positioning plate clamping frame and the expansion gun clamping frame must be adjusted according to the skeleton drawings. The specific adjustment method is as follows:

[0069] (1) First, fix the expansion gun clamping frame, move the expansion positioning plate clamping frame to make the limiting post close to it, then expand the sample and measure the size of the expansion. If the size of the expansion does not match the skeleton drawing, adjust the length of the limiting post, expand the sample again and measure. Repeat this process until the size of the expansion matches the skeleton drawing. Use this method to determine the relative distance between the expansion positioning plate clamping frame and the expansion gun clamping frame.

[0070] (2) After step (1) is completed, insert the pin connecting the grating ruler reading head into the straight hole of the expansion joint positioning plate clamping frame, loosen the expansion gun clamping frame, and then slowly push the expansion joint positioning plate clamping frame. During the pushing process, ensure that the limit post is close to the expansion gun clamping frame until the coordinate value displayed by the grating ruler digital display is consistent with the skeleton drawing. Then fix the expansion gun clamping frame, and the positioning of these two clamping frames is completed.

[0071] By applying the above-described technical solution of the present invention, at least the following technical effects are achieved:

[0072] 1. This platform achieves an integrated layout of various types of clamping frames, assembling them onto the linear guide rails of the same platform. This facilitates the adjustment of the relative positions between the clamping frames, enabling integrated operations of skeleton assembly, welding, and expansion, resulting in higher dimensional accuracy of the manufactured skeleton.

[0073] 2. The platform's clamping frame movement adopts a precision linear guide rail and slider design, which provides high positioning accuracy, convenient movement, and easy adjustment of the clamping frame's position.

[0074] 3. The platform is equipped with a grating ruler, which accurately measures the coordinates of each clamping frame and precisely controls the spacing between them. At the same time, the grating ruler can display the current position coordinate value in real time, avoiding the tedious operation of adjusting and measuring while using vernier calipers.

[0075] 4. The lattice clamping frame of this platform has a compatible design, which is compatible with the manufacturing needs of various types of skeletons, realizing a universal platform and reducing investment costs.

[0076] The above are merely several specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0077] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0078] It should be noted that, in the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. An integrated platform for assembling, welding, and expanding nuclear fuel assembly skeletons. Its features are, The system includes a base (1), a platform (2), an expansion gun clamping frame (3), an expansion joint positioning plate clamping frame (4), a grid clamping frame (5), and a lower tube seat clamping frame (6). The platform (2) is fixed on the base (1). A first linear guide rail (7) is provided on the upper surface of the platform (2). The expansion gun clamping frame (3), the expansion joint positioning plate clamping frame (4), the grid clamping frame (5), and the lower tube seat clamping frame (6) are all provided on the first linear guide rail (7). Both the holding frame (5) and the lower tube seat clamping frame (6) are provided with positioning sliders (8). The positioning sliders (8) are used to fix the expansion gun clamping frame (3), the grid clamping frame (5) and the lower tube seat clamping frame (6). The expansion positioning plate clamping frame (4) includes a first slide plate (401). The first slide plate (401) is provided with a limit post (402) on the side of the expansion gun clamping frame (3) along the axial direction. The expansion positioning plate clamping frame (4) can move freely along the axial direction during the expansion process.

2. The integrated platform according to claim 1, characterized in that, The limiting post (402) has threads on its surface. The first slide plate (401) is provided with a threaded limiting hole on the side of the expansion gun clamping frame (3) along the axial direction. The limiting post (402) is fixed to the limiting hole by threads. The exposed length of the limiting post (402) can be adjusted by rotation. The other end of the limiting post (402) has a first magnetic element. The corresponding position of the slide plate of the expansion gun clamping frame (3) has a second magnetic element. The first magnetic element and the second magnetic element can be attracted together. The maximum attraction between the first magnetic element and the second magnetic element is 5N.

3. The integrated platform according to claim 1, characterized in that, The grid clamping frame (5) includes a second slide plate (501), a U-shaped frame (502) and a first movable beam (503). The second slide plate (501) has first sliders (504) on both sides below it. The first sliders (504) are mounted on the first linear guide rail (7). The U-shaped frame (502) is fixed above the first slide plate (501). The first movable beam (503) is located at the opening of the U-shaped frame (502). The first grid pressure plate (505) is located below the first movable beam (503).

4. The integrated platform according to claim 3, characterized in that, The bottom surface and one side surface of the inner side of the U-shaped frame (502) are respectively provided with a grid positioning plate (506), and the other side surface of the inner side of the U-shaped frame (502) is provided with a second grid pressure plate (516). An axial positioning block (507) is provided on the side of the U-shaped frame (502) that is close to the lower tube seat clamping frame (6) along the axial direction. The axial positioning block (507) is provided with a first positioning hole (513) along the axial direction at one end along the radial inner side of the skeleton.

5. The integrated platform according to claim 1, characterized in that, The platform (2) is provided with a second linear guide rail (9) and a grating ruler (10) on its side. The second linear guide rail (9) is provided with a grating ruler reading head (11). The grating ruler reading head (11) is provided with a connecting plate (12). The grating ruler reading head (11) is connected to one of the expansion gun clamping frame (3), the expansion joint positioning plate clamping frame (4), the grid clamping frame (5), and the lower tube seat clamping frame (6) through the connecting plate (12). The connecting plate (12) is provided with a second slider (13) on the radial inner side of the skeleton. The second slider (13) is provided on the second linear guide rail (9).

6. The integrated platform according to claim 1, characterized in that, The lower tube seat clamping frame (6) includes a third slide plate (601), a frame (602), a positioning plate (603), a pressure plate (604), a second movable beam (605), a third movable beam (606), and a stiffening plate (607). The frame (602) is provided with a second positioning hole (608) along the axial direction along the radial inner side of the skeleton. The stiffening plate (607) is provided on the side of the frame (602) away from the expansion gun clamping frame (3). The side of the frame (602) close to the expansion gun clamping frame (3) includes an L-shaped component (609). The bottom and side surfaces of the L-shaped component (609) along the radial inner side of the skeleton are provided with positioning plates (603). The second movable beam (605) and the third movable beam (606) are respectively connected to the frame (602).

7. The integrated platform according to claim 3, characterized in that, An anti-rotation post (508) is provided between the axial positioning block (507) and the U-shaped frame (502). The anti-rotation post (508) has a first disk (509) and a second disk (510). The first disk (509) and the second disk (510) are connected by three first pins (511) evenly distributed along the circumference of the first disk (509). Two second pins (512) are provided on the side of the second disk (510) away from the first disk (509) along the axial direction. The axial positioning block (507) is provided with pin holes corresponding to the second pins (512).

8. The integrated platform according to claim 3, characterized in that, The second slide plate (501) is provided with a locking pin (514) on the side near the lower tube seat clamping frame (6). The lower end of the locking pin (514) has a thread. The positioning slider (8) is provided with a pin hole corresponding to the locking pin (514). The locking pin (514) is connected to the positioning slider (8) through the thread.

9. The integrated platform according to claim 4, characterized in that, The second grid plate (516) is provided with a fixing pin (515), the fixing pin (515) has a thread, the second grid plate (516) is connected to the U-shaped frame (502) through the fixing pin (515), and the extension length of the second grid plate (516) to the radial inward side of the frame is set by the rotation of the fixing pin (515).

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