Flexible assembly jig for launch vehicle cabin and assembly method

Abstract

The application provides a flexible assembly jig and assembly method of a launch vehicle cabin body, belonging to the technical field of launch vehicle cabin body manufacturing, which comprises an upper disc, a supporting disc, a supporting arm, a transition cylinder, a joint, a stepping plate, a base cylinder and a lower disc, the transition cylinder is connected to the base cylinder, one end of the transition cylinder is connected to the lower disc, the other end of the transition cylinder is connected to the bottom of the supporting disc, the top of the supporting disc is connected to the upper disc, the side walls of the supporting disc and the transition cylinder are respectively connected to the base cylinder, the stepping plate is respectively connected to the transition cylinder and the base cylinder, the joint is arranged on the supporting arm, the supporting arm, the base cylinder and the joint are connected to the lower disc, the bottom of the lower disc is fixed to the ground, and the assembly of cabin body components is realized through the upper disc, the supporting arm, the joint and the lower disc. The application realizes one jig with multiple uses, completes the positioning and assembly of upper and lower end frames, middle frames and cabin bodies, has the flexible assembly capacity of cabin bodies with different heights, can greatly reduce tooling investment, reduce site occupation and reduce development cost, has good process performance and remarkable economy.

Description

Technical Field

[0001] This invention relates to the field of launch vehicle body manufacturing technology, specifically to a flexible assembly jig and assembly method for launch vehicle bodies. Background Technology

[0002] In the fields of machining and assembly manufacturing, general or specialized tooling fixtures are generally required to complete product manufacturing using manual labor or equipment. However, in the assembly of riveted cabins (interstage sections, interstage sections, aft transition sections, tail sections, etc.) for launch vehicles, due to the large diameter of the cabins, tooling fixtures—assembly jigs—are essential to complete the assembly and maintain the product's shape and integrity. Riveted cabins require different process equipment for different processes such as parts processing, component assembly, and cabin component assembly. Their large size and weight result in significant space occupation and a substantial increase in development costs. Taking the tail section of an existing rocket as an example, the assembly of its upper and lower end frames (mostly L-shaped) and the drilling of the mating surfaces are achieved using two drilling jigs, each with a diameter of nearly 4 meters, costing approximately 150,000 yuan; the four-layer intermediate frames (mostly Ω-shaped, T-shaped, or T-shaped) are achieved using one frame assembly fixture, costing approximately 100,000 yuan; and the assembly jig required for tail section assembly costs approximately 600,000 yuan. It can be seen that for a single tail section, the most basic tooling investment reaches 1 million yuan, and the space required is at least 120 square meters, which will lead to huge financial investment. Especially in the model pre-research stage, cost control and space management are of great significance, and it is imperative to carry out flexible assembly jigs and process design.

[0003] Traditional riveting assembly jigs can only achieve on-frame assembly of the cabin, but cannot assemble end frames or intermediate frames. They also have difficulty in compatibility in the height direction. The internal personnel operating surface is achieved through brackets and other means, which has poor safety and is difficult to adapt to the assembly of cabins of different heights.

[0004] Currently, no descriptions or reports of technologies similar to this invention have been found, and no similar information has been collected domestically or internationally. Summary of the Invention

[0005] To address the shortcomings of existing technologies in the pre-research stage of launch vehicle models, such as the large number of riveted cabin manufacturing tooling requirements, large site area occupation, poor flexibility of assembly jigs, and high development costs, the purpose of this invention is to provide a flexible assembly jig and assembly method for launch vehicle cabins. This method can complete the assembly of end frames, intermediate frames, and cabins using a single assembly jig, and can meet the flexible assembly requirements of cabins of different heights, as well as the requirements for convenient operation and safety.

[0006] According to the present invention, a flexible assembly frame for a launch vehicle cabin includes an upper plate, a support plate, a support arm, a transition tube, a joint, a footplate, a base tube, and a lower plate. The transition tube is connected to the base tube, one end of the transition tube is connected to the lower plate, and the other end of the transition tube is connected to the bottom of the support plate. The top of the support plate is connected to the upper plate, and the side walls of the support plate and the transition tube are respectively connected to the base tube. The footplate is respectively connected to the transition tube and the base tube. The support arm is provided with a joint, and the support arm, the base tube, and the joint are connected to the lower plate. The bottom of the lower plate is fixed to the ground. The assembly of cabin components is achieved through the upper plate, the support arm, the joint, and the lower plate.

[0007] In some embodiments, the upper plate includes a plate body, an upper stop block, and lifting rings. The upper stop block is circumferentially disposed on the plate body, the plate body is engraved with a connecting plate position line, and the lifting rings are evenly distributed on the plate body.

[0008] The plate and upper stop block are assembled with the upper frame assembly of the cabin, and the upper plate is hoisted to the upper frame of the cabin through lifting rings.

[0009] In some embodiments, the lower plate includes a platform, a lower stop block, a groove, and a first positioning block. The lower stop block is circumferentially distributed on the platform, the platform is provided with a groove, and the first positioning block is located at the center of the platform. The base cylinder is positioned on the platform through the first positioning block.

[0010] In some embodiments, the transition cylinder includes a first cylinder body, a first rib, a first leveling block, an upper positioning groove, and a lower positioning groove. The two ends of the first cylinder body are respectively provided with an upper working surface and a lower working surface. The first rib is evenly distributed on the first cylinder body, and the two ends of the first rib are respectively connected to the upper working surface and the lower working surface. The upper working surface is provided with multiple upper positioning grooves. The first leveling block is evenly distributed at the bottom of the upper working surface. The lower working surface is provided with multiple lower positioning grooves. The first rib is provided with a through hole, and the first rib is connected to the pedal through the through hole.

[0011] In some embodiments, the base cylinder includes a second cylinder body, a second rib, a second leveling block, a second positioning block, and a positioning groove. The two ends of the second cylinder body are respectively provided with an upper working surface and a lower working surface. The second rib is circumferentially fixed to the second cylinder body, and the two ends of the second rib are respectively connected to the upper working surface and the lower working surface. Multiple second positioning blocks are provided on the upper working surface, and a second leveling block is provided at the bottom of the upper working surface. Multiple positioning grooves are evenly distributed on the lower working surface. The second rib is provided with a through hole, and the second rib is connected to the pedal through the through hole.

[0012] In some embodiments, the outrigger includes struts, radial positioning pins, height positioning pins, a transition section, a retaining ring, and a base section. The lower end of the base section is connected to the lower plate, and the upper end of the base section is connected to the transition section via a retaining ring. Struts are evenly distributed on the transition section and the base section, and radial positioning pins and height positioning pins are respectively provided on the struts.

[0013] The struts are positioned relative to the transition section and the base section in the height and radial directions by radial positioning pins and height positioning pins. The outermost end of the strut fits into the middle frame of the cabin, thus ensuring the roundness of the middle frame assembly.

[0014] In some embodiments, the connector includes a column, a pin, a connecting rod, an annular disk, and a positioning pin. The connecting rod passes through the column, one end of the connecting rod is connected to the pin, and the other end of the connecting rod is connected to the annular disk, on which the positioning pin is connected.

[0015] Connect the column to the lower plate and connect it to the tail fin connector of the hull via a pin. Rotate the annular disc to feed the connecting rod horizontally along the internal guide groove. When the connecting rod reaches the installation position of the tail fin connector of the hull, install the positioning pin.

[0016] In some embodiments, the pedal includes a support plate and a tripod, with the vertical support sides of the tripod connected to the first and second ribs respectively, and the horizontal support sides of the tripod connected to the support plate.

[0017] The height of the pedal in the axial direction can be adjusted by changing the position of the tripod and the first and second ribs.

[0018] In some embodiments, the support plate adopts a reinforced diffusion structure, and the support plate realizes the transition between the base cylinder or transition cylinder and the upper plate in the diameter direction.

[0019] The present invention also provides an assembly method for a flexible assembly jig for a launch vehicle hull, comprising the following steps:

[0020] S1. The upper plate is hoisted to the upper frame assembly of the cabin through the lifting ring, and then the upper plate is installed to the upper frame assembly of the cabin through the plate body and the upper stop block. The upper plate is rotated by °, and the drilling operation of the mating surface is completed by three steps of pre-drilling the bottom hole, enlarging the hole and reaming the hole using the drill bushing.

[0021] S2. The lower plate is assembled with the lower end frame assembly of the cabin through the platform and the lower stop block. The drilling operation of the docking surface is completed from bottom to top through three steps: pre-drilled bottom hole, enlarged hole, and reamed hole.

[0022] S3. The upper and lower end frames of the cabin are superimposed, the reference is aligned, and the outer edges are concentric arc surfaces. Draw the circumferential distribution lines of the stringers and main beams in sequence. Then remove the upper and lower blocks and use the upper and lower plates to position and fix the upper and lower end frames.

[0023] S4. Install the height positioning pins on each layer of the support arm to achieve the positioning of the middle frame of the cabin in the height direction;

[0024] S5. Hoist the upper plate, support plate, and upper frame onto the foundation cylinder using lifting rings, and fix them using the second positioning block;

[0025] S6. In the circumferential direction, install the stringers, beams and other parts in sequence, and use bow-shaped clamps or process rivets to position and connect them with the upper and lower end frames.

[0026] S7. Install a footboard for ease of operation based on personnel height; or, when other height cabins need to be installed, add a transition tube and a connecting section, and adjust the installation height of the footboard to achieve a transition in height and facilitate personnel operation.

[0027] S8. Rotate the radial positioning pin and adjust the position of the middle frame ring parts according to the reference positions of the upper and lower end frames to ensure that it is stuck at the end of the strut. Use parts such as stringers and beams to complete the assembly of the middle frame assembly.

[0028] S9. Pre-install the skin, with the upper frame, middle frame, lower frame, stringers, beams and other parts passing through the skin through the holes, and then expanding the holes in the opposite direction to separate the skin for excess fit and cleaning of excess material.

[0029] S10. Reinstall the skin, and rivet and bolt it together to form the hull.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention enables a single unit to serve multiple purposes, completing the positioning and assembly of the upper and lower end frames, the middle frame, and the cabin. It has the flexible assembly capability for cabins of different heights, which can significantly reduce tooling investment, reduce site occupation, reduce development costs, and has good manufacturability and significant economic benefits. Attached Figure Description

[0032] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0033] Figure 1 This is a structural diagram of the flexible assembly frame for the launch vehicle cabin according to an embodiment of the present invention.

[0034] Figure 2 This is a flowchart of an assembly method based on a flexible assembly frame for a launch vehicle cabin, according to an embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the upper plate and support plate structure;

[0036] Figure 4 This is a schematic diagram of the outrigger structure;

[0037] Figure 5 This is a schematic diagram of the transition tube structure;

[0038] Figure 6 This is a schematic diagram of the connector structure;

[0039] Figure 7 This is a schematic diagram of the pedal structure;

[0040] Figure 8 A schematic diagram of the basic tube structure;

[0041] Figure 9 This is a schematic diagram of the lower structure;

[0042] Figure 10 This is a schematic diagram of the assembly of the tail section cabin.

[0043] In the diagram: 1-Upper plate, 101-Plate body, 102-Upper stop block, 103-Lifting ring; 2-Support plate; 3-Outrigger, 301-Strut, 302-Radial positioning pin, 303-Height positioning pin, 304-Transition section, 305-Snap ring, 306-Base section; 4-Transition cylinder, 401-First cylinder body, 402-First rib, 403-First leveling block, 404-Upper positioning groove, 405-Lower positioning groove; 5-Joint 501-Column, 502-Pin, 503-Connecting rod, 504-Annular disc, 505-Positioning pin; 6-Pedal, 601-Support plate, 602-Tripod; 7-Base cylinder, 701-Second cylinder, 702-Second rib, 703-Second leveling block, 704-Second positioning block, 705-Positioning groove; 8-Lower plate, 801-Platform, 802-Lower stop block, 803-Groove, 804-First positioning block. Detailed Implementation

[0044] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0045] Example 1

[0046] A flexible assembly frame for launch vehicle hulls, such as Figure 1 As shown, the assembly includes an upper plate 1, a support plate 2, a support arm 3, a transition cylinder 4, a connector 5, a footplate 6, a base cylinder 7, and a lower plate 8. The transition cylinder 4 is connected to the base cylinder 7, with one end connected to the lower plate 8 and the other end connected to the bottom of the support plate 2. The top of the support plate 2 is connected to the upper plate 1. The side walls of the support plate 2 and the transition cylinder 4 are respectively connected to the base cylinder 7. The footplate 6 connects the transition cylinder 4 and the base cylinder 7. The support arm 3 is equipped with a connector 5. The support arm 3, the base cylinder 7, and the connector 5 are connected to the lower plate 8. The bottom of the lower plate 8 is fixed to the ground. The assembly of the cabin components is achieved through the upper plate 1, the support arm 3, the connector 5, and the lower plate 8. The support plate 2 is a reinforced and diffused structure, which facilitates the transition between the base cylinder 7 or the transition cylinder 4 and the upper plate 1 in the diametrical direction, ensuring the strength of the frame and its internal openness.

[0047] like Figure 3 The upper plate 1 includes a plate body 101, an upper stop block 102, and lifting rings 103. The upper stop blocks 102 are circumferentially arranged on the working surface of the plate body 101, and each upper stop block 102 is connected by two pins and three screws for positioning. The working surface of the plate body 101 is engraved with the joint plate position line to facilitate quick determination of the splicing position. The lifting rings 103 are evenly distributed on the plate body 101. When drilling holes at the joint surface, the upper plate 1 is rotated 90°, and the drilling operation is completed in three steps: pre-drilling the pilot hole, enlarging the hole, and reaming the hole using a drill bushing.

[0048] like Figure 9 The lower plate 8 includes a platform 801, a lower stop block 802, a groove 803, and a first positioning block 804. The lower stop blocks 802 are circumferentially distributed on the platform 801, and each lower stop block 802 is positioned and connected by two pins and three screws. The platform 801 has a groove 803 to facilitate the installation of the tail section support block. Three first positioning blocks 804 and several connecting holes are arranged at the center of the platform 801. The base cylinder 7 is connected to the platform 801 through the first positioning blocks 804. The working surface of the platform 801 is engraved with the joint plate position line to facilitate quick determination of the splicing position. When drilling holes at the joint surface, a drill bushing is used to complete the hole drilling operation from bottom to top through three steps: pre-drilling the bottom hole, enlarging the hole, and reaming the hole.

[0049] like Figure 5 The transition cylinder 4 includes a first cylinder body 401, first ribs 402, first leveling blocks 403, upper positioning grooves 404, and lower positioning grooves 405. The first cylinder body 401 has an upper working surface and a lower working surface at its two ends. The first ribs 402 are evenly distributed on the first cylinder body 401, and their two ends are connected to the upper and lower working surfaces respectively. The upper working surface has three upper positioning grooves 404 and several bolt connection holes. The first leveling blocks 403 are circumferentially distributed at the bottom of the upper working surface and are used to level the transition cylinder 4 via bolts. The lower working surface has three lower positioning grooves 405 and several bolt connection holes.

[0050] like Figure 8 The foundation cylinder 7 includes a second cylinder 701, a first rib 402, a second leveling block 703, a second positioning block 704, and positioning grooves 705. The second cylinder 701 has an upper working surface and a lower working surface at its two ends. The second rib 702 is circumferentially fixed to the second cylinder 701, and its two ends are connected to the upper and lower working surfaces respectively. The upper working surface has three square, concentric second positioning blocks 704 and several bolt connection holes. The bottom of the upper working surface has a second leveling block 703, and the foundation cylinder 7 is leveled by bolts. Multiple positioning grooves 705 are evenly distributed on the lower working surface.

[0051] The base cylinder 7 is positioned and secured to the platform 801 via the positioning groove 705, the first positioning block 804, and bolts. The transition cylinder 4 is installed on the base cylinder 7 to achieve compatibility in the frame height direction, thus meeting the assembly requirements of cabins of different heights. The first cylinder 401 and the second cylinder 701 are annular hollow reinforced structures. The first rib 402 and the first rib 402 have through holes, which are connected to the footplate 6 respectively.

[0052] like Figure 7 The pedal 6 includes a support plate 601 and a tripod 602. The vertical support side of the tripod 602 is connected to the first rib 402 and the second rib 702 respectively, and the horizontal support side of the tripod 602 is connected to the support plate 601. By adjusting the connection position of the tripod 602 with the through holes on the first rib 402 and the second rib 702, the height of the pedal 6 in the axial direction can be raised or lowered, thus facilitating operation by personnel.

[0053] like Figure 4 The support arm 3 adopts a segmented structure in the height direction to meet the assembly requirements of the intermediate frame of the cabin at different heights. The support arm 3 includes a strut 301, a radial positioning pin 302, a height positioning pin 303, a transition section 304, a retaining ring 305, and a base section 306. The lower end of the base section 306 is fastened to the lower plate 8 with pins and bolts, and the upper end of the base section 306 is connected to the transition section 304 with a retaining ring 305, pins, and bolts. The struts 301 are evenly distributed on the transition section 304 and the base section 306, and each strut 301 is equipped with a radial positioning pin 302 and a height positioning pin 303. The struts 301 achieve positional control in the height and radial directions with the base section 306 and the transition section 304 through the radial positioning pins 302 and the height positioning pins 303; and the outermost end of the strut 301 fits against the intermediate frame of the cabin, thereby ensuring the roundness of the assembled intermediate frame.

[0054] like Figure 6 The connector 5 is mainly used for assembling the tail section of the cabin, enabling precise control of the installation accuracy of the tail fin connector on the cabin. Connector 5 includes a column 501, a pin 502, a connecting rod 503, an annular disc 504, and a positioning pin 505. The connecting rod 503 passes through the column 501, with one end connected to the pin 502 and the other end connected to the annular disc 504. The positioning pin 505 is connected to the annular disc 504. The column 501 is connected to the lower plate 8 by pins and bolts, and to the tail fin connector of the cabin via the pin 502. Rotating the annular disc 504 causes the connecting rod 503 to feed horizontally along the internal guide groove. When it reaches the tail fin connector installation position, the positioning pin 505 is installed.

[0055] Example 2

[0056] This invention also provides an assembly method for a flexible assembly jig for a launch vehicle cabin, such as... Figure 2 and Figure 10 As shown, it includes the following steps:

[0057] S1. The upper plate 1 is hoisted to the upper frame assembly of the cabin through the lifting ring 103. Then, the upper plate 1 is installed to the upper frame assembly of the cabin through the plate body 101 and the upper stop block 102. The upper plate 1 is rotated 90° and the drilling operation of the mating surface is completed by three steps: pre-drilling the bottom hole, enlarging the hole, and reaming the hole using the drill sleeve.

[0058] S2 and the lower plate 8 are assembled with the lower end frame assembly of the cabin through the platform 801 and the lower stop block 802. The drilling operation of the docking surface is completed from bottom to top through three steps: pre-drilled bottom hole, enlarged hole and reamed hole.

[0059] S3. The upper and lower end frames of the cabin are superimposed, the reference is aligned, and the outer edges are concentric arc surfaces. Draw the circumferential distribution lines of the stringers and main beams in sequence. Then remove the upper block 102 and the lower block 802. Use pins and bolts to position and fix the upper and lower end frames through the upper plate 1 and the lower plate 8.

[0060] S4. Install the height positioning pins 303 on each layer of support arm 3 to achieve the positioning of the middle frame of the cabin in the height direction;

[0061] S5. Hoist the upper plate 1, support plate 2 and upper frame onto the base cylinder 7 using the lifting ring 103, and fix them with the second positioning block 701 and bolts and nuts.

[0062] S6. In the circumferential direction, install the stringers, beams and other parts in sequence, and use bow-shaped clamps or process rivets to position and connect them with the upper and lower end frames.

[0063] S7. Install pedal 6 for ease of operation by personnel at different heights; or, when it is necessary to install a cabin at other heights, the installation height of pedal 6 can be adjusted by adding transition cylinder 4 and adapter section 304 to achieve a transition in height and ease of operation for personnel.

[0064] S8. Rotate the radial positioning pin 302, adjust the position of the middle frame ring parts according to the reference positions of the upper and lower end frames, and ensure that it is stuck at the end of the strut 301. Use the stringers, beams and other parts to complete the assembly of the middle frame assembly.

[0065] S9. Pre-install the skin, with the upper frame, middle frame, lower frame, stringers, beams and other parts passing through the skin through the holes, and then expanding the holes in the opposite direction to separate the skin for excess fit and cleaning of excess material.

[0066] S10. Reinstall the skin, and rivet and bolt it together to form the hull.

[0067] More specifically, using the assembly jig in Example 1 and the process method in Example 2, the upper plate 1 and lower plate 8 can be used to assemble and drill holes for the upper and lower frames, respectively; the support arm 3 can be used to assemble the middle frame. After the components are assembled, the lower frame, middle frame, and upper frame are installed sequentially on the lower plate 8, support arm 3, and upper plate 1, and positioning and clamping are achieved using pins and bolts. Then, stringers, skin, and other parts are installed, thereby realizing the assembly of the entire compartment components. The base tube 7 and transition tubes 4 of different heights achieve flexible compatibility of the compartment at different heights; the joint 5 enables precise positioning of the tail fin joint; and the installation height of the pedal 6 facilitates operation for internal personnel.

[0068] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0069] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A flexible assembly frame for a launch vehicle cabin, characterized in that, The system includes an upper plate (1), a support plate (2), a support arm (3), a transition cylinder (4), a connector (5), a pedal (6), a base cylinder (7), and a lower plate (8). The transition cylinder (4) is connected to the base cylinder (7). One end of the transition cylinder (4) is connected to the lower plate (8), and the other end of the transition cylinder (4) is connected to the bottom of the support plate (2). The top of the support plate (2) is connected to the upper plate (1). The side walls of the support plate (2) and the transition cylinder (4) are respectively connected to the base cylinder (7). The pedal (6) is respectively connected to the transition cylinder (4) and the base cylinder (7). The support arm (3) is provided with the connector (5). The support arm (3), the base cylinder (7), and the connector (5) are connected to the lower plate (8). The bottom of the lower plate (8) is fixed to the ground. The assembly of the cabin components is achieved through the upper plate (1), the support arm (3), the connector (5), and the lower plate (8). The upper plate (1) includes a plate body (101), an upper stop block (102), and a lifting ring (103). The upper stop block (102) is circumferentially arranged on the plate body (101). The plate body (101) is engraved with a plate position line. The lifting ring (103) is evenly distributed on the plate body (101). The plate (101) and the upper stop block (102) are assembled with the upper frame assembly of the cabin, and the upper plate (1) and the upper frame of the cabin are hoisted by the lifting ring (103); The lower plate (8) includes a platform (801), a lower stop block (802), a groove (803), and a first positioning block (804). The lower stop block (802) is circumferentially distributed on the platform (801). The platform (801) is provided with a groove (803). The first positioning block (804) is located at the center of the platform (801). The base cylinder (7) is positioned on the platform (801) by the first positioning block (804). The support arm (3) includes a strut (301), a radial positioning pin (302), a height positioning pin (303), a transition section (304), a retaining ring (305), and a base section (306). The lower end of the base section (306) is connected to the lower plate (8), and the upper end of the base section (306) is connected to the transition section (304) through the retaining ring (305). The struts (301) are evenly distributed on the transition section (304) and the base section (306). The radial positioning pin (302) and the height positioning pin (303) are respectively provided on the struts (301). The strut (301) achieves position control with the transition section (304) and the base section (306) in the height and radial directions through the radial positioning pin (302) and the height positioning pin (303). The outermost end of the strut (301) fits against the middle frame of the cabin, thereby ensuring the roundness of the middle frame assembly. The connector (5) includes a column (501), a pin (502), a connecting rod (503), an annular disc (504), and a positioning pin (505). The connecting rod (503) passes through the column (501), one end of the connecting rod (503) is connected to the pin (502), and the other end of the connecting rod (503) is connected to the annular disc (504). The positioning pin (505) is connected to the annular disc (504). The column (501) is connected to the lower plate (8), and connected to the tail fin connector of the cabin through the pin (502). The annular disk (504) is rotated to make the connecting rod (503) feed horizontally along the internal guide groove. When the connecting rod (503) reaches the installation position of the tail fin connector of the cabin, the positioning pin (505) is installed.

2. The flexible assembly frame for the launch vehicle cabin according to claim 1, characterized in that, The transition cylinder (4) includes a first cylinder body (401), a first rib (402), a first leveling block (403), an upper positioning groove (404), and a lower positioning groove (405). The first cylinder body (401) has an upper working surface and a lower working surface at its two ends. The first rib (402) is evenly distributed on the first cylinder body (401), and the two ends of the first rib (402) are connected to the upper working surface and the lower working surface, respectively. The upper working surface is provided with a plurality of upper positioning grooves (404). The first leveling block (403) is evenly distributed at the bottom of the upper working surface. The lower working surface is provided with a plurality of lower positioning grooves (405). The first rib (402) is provided with a through hole, and the first rib (402) is connected to the pedal (6) through the through hole.

3. The flexible assembly frame for the launch vehicle cabin according to claim 2, characterized in that, The base cylinder (7) includes a second cylinder body (701), a second rib (702), a second leveling block (703), a second positioning block (704), and a positioning groove (705). The two ends of the second cylinder body (701) are respectively provided with an upper working surface and a lower working surface. The second rib (702) is circumferentially fixed on the second cylinder body (701), and the two ends of the second rib (702) are respectively connected to the upper working surface and the lower working surface. The upper working surface is provided with a plurality of second positioning blocks (704), the bottom of the upper working surface is provided with a second leveling block (703), and the lower working surface is evenly distributed with a plurality of positioning grooves (705). The second rib (702) is provided with a through hole, and the second rib (702) is connected to the pedal (6) through the through hole.

4. The flexible assembly frame for the launch vehicle cabin according to claim 3, characterized in that, The pedal (6) includes a support plate (601) and a tripod (602). The vertical support of the tripod (602) is connected to the first rib (402) and the second rib (702) respectively, and the horizontal support of the tripod (602) is connected to the support plate (601). By adjusting the position of the tripod (602) and the first rib (402) and the second rib (702), the height of the pedal (6) in the axial direction can be raised or lowered.

5. The flexible assembly frame for a launch vehicle cabin according to claim 1, characterized in that, The support plate (2) adopts a reinforced diffusion structure, and the support plate (2) realizes the transition between the base cylinder (7) or the transition cylinder (4) and the upper plate (1) in the diameter direction.

6. The assembly method of the flexible assembly frame for the launch vehicle cabin according to claim 3 or 4, characterized in that, Includes the following steps: S1. The upper plate (1) is hoisted to the upper frame assembly of the cabin through the lifting ring (103), and then the upper plate (1) is installed to the upper frame assembly of the cabin through the plate body (101) and the upper stop block (102). The upper plate (1) is rotated 90° and the drilling operation of the mating surface is completed by three steps: pre-drilling the bottom hole, expanding the hole, and reaming the hole using a drill bushing. S2. The lower plate (8) is assembled with the lower end frame assembly of the cabin through the platform (801) and the lower stop block (802), and the drilling operation of the docking surface is completed from bottom to top through three steps of pre-drilled bottom hole, enlarged hole and reamed hole using a drill bushing. S3. The upper and lower end frames of the cabin are superimposed, the reference is aligned, the outer edges are concentric, and the circumferential distribution lines of the stringers and beams are drawn in sequence; then the upper block (102) and the lower block (802) are removed, and the upper and lower end frames are positioned and fixed through the upper plate (1) and the lower plate (8); S4. Install the height positioning pins (303) on the support arms (3) of each layer to achieve the positioning of the middle frame of the cabin in the height direction; S5. The upper plate (1), the support plate (2) and the upper frame are hoisted onto the base cylinder (7) by the lifting ring (103) and fixed by the second positioning block (704); S6. In the circumferential direction, install the stringers and beams in sequence, and use bow-shaped clamps or process rivets to position and connect them to the upper and lower end frames. S7. Install the pedal (6) according to the height of the personnel for convenient operation; or, when it is necessary to install a cabin of other heights, the transition tube (4) and the adapter section (304) are added, and the installation height of the pedal (6) is adjusted to achieve the transition in height direction and the convenience of personnel operation; S8. Rotate the radial positioning pin (302) and adjust the position of the middle frame ring part according to the reference position of the upper and lower end frames to ensure that it is stuck at the end of the support rod (301). The assembly of the middle frame assembly is completed with the help of the stringers and beam parts. S9. Pre-install the skin, and make holes in the skin from the upper frame, middle frame, lower frame, stringers, and main beam parts, and then expand the holes in the opposite direction to separate the skin for excess material repair and cleaning of excess material. S10. Reinstall the skin, and rivet and bolt it together to form the hull.

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