Large-area flexible thermal protection material assembly tool and method

Abstract

A large-area flexible thermal protection material assembly fixture and method are disclosed for assembling thermal protection systems for reusable aircraft. The fixture includes: a thermal protection pressurization device, a mounting mechanism, a support vertical beam, an assembly platform, anti-collision strips, and rolling pulleys. The thermal protection pressurization device comprises an upper crossbeam, a lower crossbeam, a locking screw, a pressurization adjustment assembly, a slider, a support screw, and a pressure plate. The pressurization adjustment assembly includes a ball-head pressure plate, a ball-head pressure rod, a rectangular spring, a spring guide seat, a main screw, a rotating nut assembly, a longitudinal swing arm, a height adjustment rod, a longitudinal connecting rod, a support, a sliding assembly, a lateral swing arm, a connecting flange, a pressure sensor, a lateral connecting rod, and a lateral adjustment rod. This invention solves the assembly feasibility problem of flexible thermal protection materials at different curvatures and positions, and addresses issues such as quantitative and visual control of adhesive pressure. It is of great significance for improving the assembly reliability of thermal protection systems for reusable aircraft and ensuring successful flight of the aircraft.

Description

Technical Field

[0001] This invention belongs to the field of functional composite material thermal protection assembly, and more specifically, relates to a tooling and method for assembling large-area flexible thermal protection materials for reusable aircraft. Background Technology

[0002] To withstand the thermal environment during flight and ensure the safe and reliable return and reusability of reusable aircraft, a certain type of reusable aircraft uses a large-area compressible flexible thermal insulation felt as the leeward thermal protection system. The flexible thermal protection structure in each part has a three-dimensional irregular shape. The flexible thermal protection material is bonded to the composite material skin surface of the aircraft using high-temperature resistant adhesives. The bonding and assembly of the flexible thermal protection material requires curing under certain pressure to ensure sufficient bond strength. Vacuum pressurization is typically used for bonding and assembling flexible thermal protection materials; however, the composite material skin and structural components of aircraft often have numerous gaps, holes, and openings, leading to air leakage and making vacuum pressurization unsuitable for bonding and curing. Therefore, controlling the magnitude and direction of pressure during the bonding and curing process of the flexible thermal protection material is crucial to ensuring the reliability of the thermal protection system's bonding and assembly. Summary of the Invention

[0003] The technical problem solved by this application is to overcome the shortcomings of the prior art and provide a tooling and method for assembling large-area flexible thermal protection materials, solve the problems of pressure curing and bonding of flexible thermal protection materials, realize quantitative and visual control of pressure for flexible thermal protection bonding and assembly, and ensure the bonding strength and reliability of thermal protection during flight.

[0004] The technical solution provided in this application is as follows:

[0005] A large-area flexible thermal protection material assembly fixture includes an assembly platform and a thermal protection pressurization device connected to the assembly platform. The thermal protection pressurization device includes a position adjustment component and a pressurization adjustment component.

[0006] The pressure adjustment assembly includes a sliding assembly, a swing assembly, a pressure fine-tuning assembly, a pressure sensor, a connecting rod, a ball-head pressure plate, and a pressure plate connected in sequence. The sliding assembly is connected to the assembly platform through a position adjustment assembly. The swing assembly is used to drive the pressure plate to adjust in the horizontal and vertical directions. The pressure fine-tuning assembly is used to adjust the pressure of the pressure plate pressing the flexible thermal protection. The pressure sensor is used to measure the pressure of the pressure plate. The connecting rod and the ball-head pressure plate are connected by a ball joint.

[0007] The position adjustment component is used to adjust the horizontal and vertical positions of the sliding component.

[0008] The swing assembly includes a lateral swing arm and a longitudinal swing arm. One end of the lateral swing arm is horizontally and vertically connected to the sliding assembly, and the other end of the lateral swing arm is horizontally and rotatably connected to one end of the longitudinal swing arm. The other end of the longitudinal swing arm is connected to the pressure fine-tuning assembly. A horizontal adjustment assembly for adjusting the rotation of the lateral swing arm is provided between the lateral swing arm and the sliding assembly, and a longitudinal adjustment assembly for adjusting the rotation of the longitudinal swing arm is provided between the longitudinal swing arm and the lateral swing arm.

[0009] The horizontal adjustment assembly includes a horizontal connecting rod and a horizontal adjusting rod. One end of the horizontal connecting rod is vertically rotatably connected to the horizontal swing arm, and the other end is vertically rotatably connected to the end connector. The end connector is rotatably connected to the end of the horizontal adjusting rod. The horizontal adjusting rod is connected to the sliding assembly via a thread.

[0010] The longitudinal adjustment assembly includes a height adjustment rod, a longitudinal connecting rod, and a support. The support is fixedly connected to the transverse swing arm, the height adjustment rod is threadedly connected to the transverse swing arm, one end of the longitudinal connecting rod is horizontally rotatably connected to the longitudinal swing arm, and the other end is horizontally rotatably connected to the upper connecting seat. The height adjustment rod is rotatably connected to the upper connecting seat, and the rotation of the height adjustment rod causes the end of the longitudinal connecting rod to move vertically.

[0011] The pressure fine-tuning component consists of a main screw and a rotating nut assembly. The main screw is slidably connected to the swing assembly along its own axis, and the rotating nut assembly is sleeved on the outside of the main screw and rotatably connected to the swing assembly. The end of the main screw away from the swing assembly is connected to the pressure sensor.

[0012] The connecting rod includes a connecting flange, a ball-head pressure rod, a rectangular spring, and a spring guide seat. The pressure sensor is connected to the spring guide seat through the connecting flange. The ball-head pressure rod is inserted into the spring guide seat. The rectangular spring is connected between the spring guide seat and the ball-head pressure rod to provide elastic force to the ball-head pressure rod in the direction of flexible thermal protection. The ball-head pressure plate is ball-hinged to the end of the ball-head pressure rod away from the spring guide seat.

[0013] The inner side of the end of the spring guide seat near the connecting flange is a limiting hole, the diameter of which is larger than the inner diameter of the spring guide seat. The end of the ball head pressure rod inserted into the spring guide seat is provided with a limiting part with a diameter larger than the inner diameter of the spring guide seat, and the limiting part is located inside the limiting hole.

[0014] The position adjustment assembly includes an upper crossbeam, a lower crossbeam, a locking screw, a slider, and a support screw. The assembly platform is provided with multiple support vertical beams. Both ends of the upper and lower crossbeams are connected to sliders. The upper and lower crossbeams are vertically slidably connected to the support vertical beams via sliders. The locking screw is used to lock the sliders to the support vertical beams. The sliding assembly is horizontally slidably connected to the upper crossbeam. The upper crossbeam is located above the lower crossbeam. An adjustment block is horizontally slidably connected to the lower crossbeam. The support screw vertically passes through the adjustment block and is threadedly connected to the adjustment block. The top of the support screw is located below the sliding assembly.

[0015] The bottom of the assembly platform is connected to a base mechanism and a rolling pulley. The base mechanism is an adjustable structure. When the base mechanism is extended, the rolling pulley moves away from the ground and supports the ground, fixing the assembly platform to the ground. When the base mechanism is shortened, the rolling pulley contacts the ground, allowing the assembly platform to move on the ground via the rolling pulley.

[0016] A method for assembling a large-area flexible thermal protection material, comprising assembling using any of the aforementioned assembly fixtures for large-area flexible thermal protection materials, including:

[0017] S: Flexible thermal protection assembly to the aircraft;

[0018] S: Move the assembly platform next to the flexible thermal protection and adjust the position adjustment components so that the flexible thermal protection pressurization device is facing the flexible thermal protection.

[0019] S: Adjust the angle of the pressure plate by using the swing assembly to align the pressure plate with the flexible thermal protection;

[0020] S: Adjust the applied contact pressure between the pressure plate and the flexible thermal protection through the pressure fine-tuning component to set the pressure for pressure curing;

[0021] S: Repeat SS, assemble the next thermal protection unit.

[0022] In summary, this application includes at least the following beneficial technical effects:

[0023] A three-dimensional flexible thermal protection material bonding and assembly flexible pressure tooling was designed, which can realize multi-angle, quantitative and visual control of pressure. A large-area flexible thermal protection assembly method was proposed to realize flexible pressure assembly of thermal protection in different parts and ensure the reliability of thermal protection bonding. Attached Figure Description

[0024] Figure 1 The image shows a flexible thermal protection assembly fixture.

[0025] Figure 2 The image shows a flexible thermal protection pressurization device.

[0026] Figure 3 The image shown is a cross-sectional view of the pressure regulating component.

[0027] Figure 4 The diagram shows a three-dimensional structural schematic of the pressure regulating component.

[0028] Figure 5 The diagram shows the assembly process flow for flexible thermal protection.

[0029] Explanation of reference numerals: 1. Thermal protection pressurization device; 2. Grounding mechanism; 3. Supporting vertical beam; 4. Assembly platform; 5. Anti-collision strip; 6. Rolling pulley; 7. Aircraft skin; 8. Flexible thermal protection;

[0030] 9. Upper crossbeam; 10. Lower crossbeam; 11. Locking screw; 12. Pressure adjustment assembly; 13. Slider; 14. Support screw; 15. Pressure plate; 16. Ball head pressure plate; 17. Ball head pressure rod; 18. Rectangular spring; 19. Spring guide seat; 20. Main screw; 21. Rotating nut assembly; 22. Longitudinal swing arm; 23. Height adjustment rod; 24. Longitudinal connecting rod; 25. Support; 26. Sliding assembly; 27. Lateral swing arm; 28. Connecting flange; 29. ​​Pressure sensor; 30. Lateral connecting rod; 31. Lateral adjustment rod. Detailed Implementation

[0031] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0032] The aircraft skin 7 constitutes the aerodynamic shape of the aircraft and is a skin structure formed from 3mm thick carbon fiber composite material. The flexible thermal protection 8 is a flexible thermal insulation felt material, bonded to the aircraft surface with adhesive and cured under pressure. A large number of flexible thermal insulation felts are spliced ​​and bonded together to form the thermal protection system. The flexible thermal protection 8 is bonded to the outer side of the aircraft skin 7.

[0033] This application discloses a large-area flexible thermal protection material assembly fixture for assembling reusable aircraft thermal protection systems, such as... Figure 1 As shown, the assembly includes: a thermal protection pressurization device 1, a mounting mechanism 2, supporting vertical beams 3, an assembly platform 4, anti-collision strips 5, and rolling pulleys 6. The assembly platform 4 connects to multiple supporting vertical beams 3, and the bottom of the assembly platform 4 connects to the mounting mechanism 2 and the rolling pulleys 6. The anti-collision strips 5 are connected to the side of the assembly platform 4 facing the aircraft skin. The thermal protection pressurization device 1 is connected between the supporting vertical beams 3. The thermal protection pressurization device 1 is used to pressurize the flexible thermal protection 8 during the bonding process to the outside of the aircraft skin 7, ensuring stable and quantitative pressurization during the bonding process.

[0034] The rolling pulleys 6 are four rolling devices installed below the assembly platform 4, which can roll in any direction on a horizontal surface. The anchoring mechanism 2 is a heat-protected assembly fixture welded to the bottom of the assembly platform 4. It is an adjustable mechanism that can be raised and lowered. When the anchoring mechanism 2 is adjusted to extend, the rolling pulleys 6 of the assembly platform move away from the ground, the anchoring mechanism supports the ground and locks, and the support beam 3 and the assembly platform 4 are fixed to the ground. When the anchoring mechanism is adjusted to shorten, the rolling pulleys 6 contact the ground, and the assembly platform 4 can move on the ground through the rolling pulleys 6.

[0035] The supporting vertical beam 3 is the main load-bearing beam of the assembly platform. It is a square steel structure and is welded to the upper and lower frames of the assembly platform. It supports the load of the assembly platform in the height direction and bears the reverse force when the heat protection pressurization device 1 applies pressure in the horizontal direction.

[0036] Assembly platform 4 is a work platform for personnel during assembly operations. It is a lightweight aluminum alloy structure with safety guardrails installed around it. Its inner side is a conformal structure that matches the shape of the aircraft.

[0037] The anti-collision strip 5 is made of flexible and compressible foam and is installed on the conformal side of the assembly platform 4 to prevent collision damage to the aircraft during use.

[0038] like Figure 2 As shown, the thermal protection pressurization device 1 is a pressure control and adjustment device for bonding large-area thermal protection material to the aircraft skin. The thermal protection pressurization device 1 includes an upper crossbeam 9, a lower crossbeam 10, a locking screw 11, a pressurization adjustment component 12, a slider 13, a support screw 14, and a pressure plate 15.

[0039] The upper crossbeam 9 is the load-bearing support structure for the flexible pressure adjustment component 12 and is made of square steel. The upper crossbeam 10 is also the load-bearing support structure for the flexible pressure adjustment component 12 and is made of square steel. The pressure adjustment component 12 is horizontally slidably connected to the upper crossbeam 9. The slider 13 is a sliding device installed at both ends of the upper crossbeam 9 and the lower crossbeam 10, and can move up and down along the supporting vertical beam 13 to adjust the position and height of the pressure adjustment component 12. The locking screw 11 is a locking structure used to lock the movement of the slider 13, fixing the slider 13 to the supporting vertical beam 3.

[0040] An adjusting block is horizontally slidably connected to the lower crossbeam 10. A support screw 14 passes vertically through the adjusting block and is threadedly connected to it. The top of the support screw 14 is located below the pressure adjustment assembly 12. The support screw 14 is used to support and adjust the position and height of the pressure adjustment assembly 12. When the locking screws 11 at both ends of the upper crossbeam 9 are loosened, the support screw 14 is rotated. The top of the support screw 14 pushes the flexible pressure adjustment assembly 12 and the upper crossbeam 9 upward together. After they are in place, the locking screws 11 at both ends of the upper crossbeam 9 are locked, and the upper crossbeam 9 is fixed to the support vertical beam 3, thus achieving precise adjustment of the height of the pressure adjustment assembly 12.

[0041] The pressure plate 15 is connected to the pressure adjustment component 12. The pressure plate 15 is a conformal structure that applies pressure in direct contact with the flexible thermal protection. It is made of closed-cell polyurethane foam material. The corresponding conformal pressure plate 15 can be replaced according to the size and shape of the flexible thermal protection.

[0042] like Figure 3 As shown, the pressure adjustment assembly 12 includes a ball-head pressure plate 16, a ball-head pressure rod 17, a rectangular spring 18, a spring guide seat 19, a main screw 20, a rotating nut assembly 21, a longitudinal swing arm 22, a height adjustment rod 23, a longitudinal connecting rod 24, a support 25, a sliding assembly 26, a transverse swing arm 27, a connecting flange 28, a pressure sensor 29, a transverse connecting rod 30, and a transverse adjustment rod 31.

[0043] The sliding assembly 26 is installed on the upper crossbeam 9 and can move left and right along the upper crossbeam 9. The transverse swing arm 27 is vertically rotatably connected to the sliding assembly 26. The support 25 is fixedly connected to the upper surface of the transverse swing arm 27. The longitudinal swing arm 22 is horizontally rotatably connected to the end of the transverse swing arm 27 away from the sliding assembly 26. The upper surface of the longitudinal swing arm 22 is horizontally rotatably connected to one end of the longitudinal connecting rod 24. The other end of the longitudinal connecting rod 24 is horizontally rotatably connected to the upper connecting seat. The support 25 is threadedly connected to a height adjusting rod 23, and the bottom of the height adjusting rod 23 is rotatably connected to the upper connecting seat. One end of the main screw 20 is inserted into the longitudinal swing arm 22 and is slidably connected to the longitudinal swing arm 22. The rotating nut assembly 21 is sleeved on the outside of the main screw 20 and threadedly connected to the main screw 20. The rotating nut assembly 21 is also rotatably connected to the longitudinal swing arm 22. This makes the screw 20 and the rotating nut assembly 21 form a screw-nut structure. By adjusting the rotating nut assembly 21, the movement of the screw can be adjusted to apply mechanical pressure.

[0044] Specifically, the longitudinal swing arm 22 has a threaded hole in the middle, and its upper and left ends are connected to the longitudinal connecting rod 24 and the transverse swing arm 27 via pins. The height adjustment rod 23 is connected to the longitudinal connecting rod 24 via a pin and to the support 25 via threads. By adjusting the height adjustment rod 23, the longitudinal swing arm 22 can be adjusted to swing longitudinally, thereby adjusting the contact direction between the pressure plate and the aircraft, and adjusting the direction of applied pressure. The transverse swing arm 27 is connected to the sliding assembly 26 and the longitudinal swing arm 22 via different pins, and can swing horizontally relative to the pressure adjustment assembly 12.

[0045] The end of the main screw 20 furthest from the longitudinal rocker arm 22 is connected to the connecting flange 28 via a pressure sensor 29. The pressure sensor 29 is installed between the connecting flange 28 and the screw 20 to monitor the pressure applied to the flexible thermal protection 8. The end of the connecting flange 28 furthest from the pressure sensor 29 is bolted to the spring guide seat 19. The spring guide seat 19 is a hollow sleeve shape. One end of the ball-head pressure rod 17 is inserted into the spring guide seat 19, and a rectangular spring 18 is sleeved on the outer wall of the ball-head pressure rod 17. One end of the rectangular spring 18 abuts against the end of the spring guide seat 19 furthest from the connecting flange 28, and the other end is connected to the outer wall of the ball-head pressure rod 17. The rectangular spring 18 is a pressure transmission spring that slowly applies the pressure of the screw 20 to the flexible thermal protection 8. The spring guide seat 19 is a guiding and supporting structure for the rectangular spring 18. The inner side of the end of the spring guide seat 19 near the connecting flange 28 is a limiting hole. The diameter of the limiting hole is larger than the inner diameter of the spring guide seat 19, thus forming a stepped hole. The end of the ball head pressure rod 17 inserted into the spring guide seat 19 is provided with a limiting part with a diameter larger than the inner diameter of the spring guide seat 19. The limiting part is located in the limiting hole to ensure that the limiting part will not come out of the limiting hole.

[0046] The ball-head pressure plate 16 is connected to the end of the ball-head pressure rod 17 via a ball joint, and the pressure plate 15 is installed on the ball-head pressure plate 16 by screws. The ball-head pressure plate 16 forms a ball joint with the ball structure at the end of the ball-head pressure rod 17, which allows the direction and posture of the pressure plate 15 to be adjusted arbitrarily.

[0047] like Figure 4 As shown, both ends of the transverse connecting rod 30 are vertically rotatably connected to the transverse swing arm 27 and the end connector respectively via pins. The end connector is rotatably connected to the end of the transverse adjusting rod 31. The horizontal transverse adjusting rod 31 is connected to the sliding assembly 26 via threads. Adjusting the rotation of the transverse adjusting rod 31 causes the transverse swing arm 27 to rotate together, thereby adjusting the relative position of the pressure plate 15 and the aircraft in the horizontal direction as a whole.

[0048] Achieving quantitative and visual control of pressure bonding for flexible thermal protection systems that adapt to multiple curvatures is of great significance for improving the assembly technology of thermal protection systems for reusable aircraft and ensuring the reusability of aircraft.

[0049] The assembly method includes: 1. Trial fitting of flexible thermal protection; 2. Applying adhesive to flexible thermal protection; 3. Assembling flexible thermal protection onto the aircraft; 4. Adjusting the assembly platform and the pressurizing device for flexible thermal protection; 5. Adjusting the angle to align with the flexible thermal protection; 6. Adjusting the applied contact pressure and pressurizing for curing; 7. Assembling the next thermal protection unit.

[0050] like Figure 5 The diagram shows the thermal protection assembly process flow.

[0051] Trial fitting of flexible thermal protection to the aircraft skin assembly position → Apply adhesive to the flexible thermal protection assembly surface → Adhesive bonding and temporary fixation of the flexible thermal protection to the aircraft skin → Move the assembly platform to the assembly area, adjust the height of the flexible thermal protection pressurizing device, move the horizontal position of the sliding component close to the flexible thermal protection to be bonded, and lock the anchoring mechanism to fix the thermal protection assembly platform → Rotate the lateral adjustment rod to adjust the horizontal swing angle of the pressurizing component, and rotate the height adjustment rod to adjust the longitudinal angle of the screw so that the position of the pressure plate is aligned with the direction of the flexible thermal protection to be bonded → Adjust the rotating nut assembly to make the pressure plate gradually contact the flexible thermal protection and apply pressure, monitor the sensor pressure to ensure that it meets the bonding process pressure requirements, and maintain it. The flexible thermal protection will complete curing under pressure → Release the pressure and assemble the next position of thermal protection according to the above method.

[0052] The present application has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present application. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and implementation methods of the present application without departing from the spirit and scope of the present application, and all such modifications and improvements fall within the scope of the present application. The scope of protection of the present application is determined by the appended claims.

[0053] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

Claims

1. A tooling for assembling large-area flexible thermal protection materials, characterized in that: It includes an assembly platform and a thermal protection pressurization device (1) connected to the assembly platform. The thermal protection pressurization device (1) includes a position adjustment component and a pressurization adjustment component (12). The pressure adjustment assembly (12) includes a sliding assembly (26), a swing assembly, a pressure fine-tuning assembly, a pressure sensor (29), a connecting rod, a ball-head pressure plate (16), and a pressure plate (15) connected in sequence. The sliding assembly (26) is connected to the assembly platform through the position adjustment assembly. The swing assembly is used to drive the pressure plate (15) to adjust in the horizontal and vertical directions. The pressure fine-tuning assembly is used to adjust the pressure of the pressure plate (15) pressing the flexible thermal protection. The pressure sensor (29) is used to measure the pressure of the pressure plate (15). The connecting rod and the ball-head pressure plate (16) are connected by a ball joint. The position adjustment component is used to adjust the horizontal and vertical positions of the sliding component (26).

2. The assembly fixture for a large-area flexible thermal protection material according to claim 1, characterized in that: The swing assembly includes a horizontal swing arm (27) and a vertical swing arm (22). One end of the horizontal swing arm (27) is horizontally and vertically connected to the sliding assembly (26), and the other end of the horizontal swing arm (27) is horizontally and rotatably connected to one end of the vertical swing arm (22). The other end of the vertical swing arm (22) is connected to a pressure fine-tuning assembly. A horizontal adjustment assembly for adjusting the rotation of the horizontal swing arm (27) is provided between the horizontal swing arm (27) and the sliding assembly (26), and a vertical adjustment assembly for adjusting the rotation of the vertical swing arm (22) is provided between the vertical swing arm (22) and the horizontal swing arm (27).

3. The assembly fixture for a large-area flexible thermal protection material according to claim 2, characterized in that: The horizontal adjustment assembly includes a horizontal connecting rod (30) and a horizontal adjusting rod (31). One end of the horizontal connecting rod (30) is vertically rotatably connected to the horizontal swing arm (27), and the other end is vertically rotatably connected to the end connector. The end connector is rotatably connected to the end of the horizontal adjusting rod (31). The horizontal adjusting rod (31) is connected to the sliding assembly (26) by a thread.

4. The assembly tooling for a large-area flexible thermal protection material according to claim 2, characterized in that: The longitudinal adjustment assembly includes a height adjustment rod (23), a longitudinal connecting rod (24), and a support (25). The support (25) is fixedly connected to the transverse swing arm (27). The height adjustment rod (23) is threadedly connected to the transverse swing arm (27). One end of the longitudinal connecting rod (24) is horizontally rotatably connected to the longitudinal swing arm (22), and the other end is horizontally rotatably connected to the upper connecting seat. The height adjustment rod (23) is rotatably connected to the upper connecting seat. The rotation of the height adjustment rod (23) drives the end of the longitudinal connecting rod (24) to move vertically.

5. The assembly fixture for a large-area flexible thermal protection material according to claim 1, characterized in that: The pressure fine-tuning component has a main screw (20) and a rotating nut assembly (21). The main screw (20) is slidably connected to the swing assembly along its own axis. The rotating nut assembly (21) is sleeved on the main screw (20) and rotatably connected to the swing assembly. The end of the main screw (20) away from the swing assembly is connected to the pressure sensor (29).

6. The assembly tooling for a large-area flexible thermal protection material according to claim 1, characterized in that: The connecting rod includes a connecting flange (28), a ball-head pressure rod (17), a rectangular spring (18), and a spring guide seat (19). The pressure sensor (29) is connected to the spring guide seat (19) through the connecting flange (28). The ball-head pressure rod (17) is inserted into the spring guide seat (19). The rectangular spring (18) is connected between the spring guide seat (19) and the ball-head pressure rod (17) to provide elastic force to the ball-head pressure rod (17) in the direction of flexible thermal protection. The ball-head pressure plate (16) is ball-hinged to the end of the ball-head pressure rod (17) away from the spring guide seat (19).

7. The assembly fixture for a large-area flexible thermal protection material according to claim 6, characterized in that: The inner side of the end of the spring guide seat (19) near the connecting flange (28) is a limiting hole. The diameter of the limiting hole is larger than the inner diameter of the spring guide seat (19). The end of the ball head pressure rod (17) inserted into the spring guide seat (19) is provided with a limiting part with a diameter larger than the inner diameter of the spring guide seat (19). The limiting part is located in the limiting hole.

8. The assembly fixture for a large-area flexible thermal protection material according to claim 1, characterized in that: The position adjustment assembly includes an upper crossbeam (9), a lower crossbeam (10), a locking screw (11), a slider (13), and a support screw (14). The assembly platform (4) is provided with multiple support vertical beams (3). The upper crossbeam (9) and the lower crossbeam (10) are connected to the slider (13) at both ends. The upper crossbeam (9) and the lower crossbeam (10) are vertically slidably connected to the support vertical beam (3) through the slider (13). The locking screw (11) is used to lock the slider (13) and the support vertical beam (3). The sliding assembly (26) is horizontally slidably connected to the upper crossbeam (9). The upper crossbeam (9) is located above the lower crossbeam (10). An adjustment block is horizontally slidably connected to the lower crossbeam (10). The support screw (14) vertically passes through the adjustment block and is threadedly connected to the adjustment block. The top of the support screw (14) is located below the sliding assembly (26).

9. The assembly tooling for a large-area flexible thermal protection material according to claim 1, characterized in that: The bottom of the assembly platform (4) is connected to the base mechanism (2) and the rolling pulley (6). The base mechanism (2) is a structure with adjustable length. When the base mechanism (2) is extended, the rolling pulley (6) moves away from the ground and supports the ground. The assembly platform (4) is fixed to the ground. When the base mechanism is shortened, the rolling pulley (6) contacts the ground and the assembly platform (4) can move on the ground through the rolling pulley (6).

10. A method for assembling a large-area flexible thermal protection material, characterized in that: Assembly is performed using a large-area flexible thermal protection material assembly fixture as described in any one of claims 1-9, including... S1: Flexible thermal protection assembly to the aircraft; S2: Move the assembly platform (4) to the side of the flexible thermal protection, and adjust the position adjustment component so that the flexible thermal protection pressurization device is facing the flexible thermal protection; S3: Adjust the angle of the pressure plate (15) by swinging the assembly so that the pressure plate (15) is aligned with the flexible thermal protection; S4: Adjust the applied contact pressure between the pressure plate (15) and the flexible thermal protection through the pressure fine-tuning component to set the pressure and perform pressure curing; S5: Repeat S1-S4 to assemble the next thermal protection device.

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