Liquid hot press cooperative loading device for patch repair of complex aluminum alloy structure

Abstract

The utility model relates to the field of aircraft body structure maintenance, specifically disclose a kind of liquid hot pressure collaborative loading device of complex aluminium alloy structure patching repair, including support plate, the top of support plate is equipped with first pressure piece or second pressure piece, first pressure piece is installed in the both sides of support plate, second pressure piece is installed in the top middle end of support plate, first pressure piece and second pressure piece are used to exert downward pressure to support plate, and the bottom of support plate is also provided with the pressure transmission heating assembly of cooperation, and the pressure transmission heating assembly is placed in the inside for supporting when being used to repair structure. By simple telescopic support rod and T-shaped pull rod, the composite material patching repair of three, four even five complex aluminium alloy structures can be provided with pressure support, suitable for the curing pressure exertion of a variety of different structural characteristics, with very strong structural adaptability.

Description

Technical Field

[0001] This utility model relates to a collaborative loading device, specifically a liquid thermo-pressed collaborative loading device for patching and repairing complex aluminum alloy structures, belonging to the field of aircraft airframe structure maintenance. Background Technology

[0002] The airframe structure of aircraft, both domestically and internationally, is primarily made of aluminum alloy. When damage occurs, composite material patching is a high-tech repair method. However, due to the characteristic features of structures such as webs, ribs, and fasteners, it is difficult to effectively apply temperature and pressure during composite material patching, resulting in low local pressure and large temperature differences, thus reducing repair quality. Currently, domestic methods for pressurizing or heating complex aluminum alloy structures in composite material patching repair are independent, making it difficult to coordinate heating and pressurizing. Furthermore, the heating and pressurizing tooling requires special design and lacks universality. For example, Chinese patent CN202221470960.0 discloses a mechanical pressurizing and removal tooling for composite material adhesive bonding repair, but this method requires specialized tooling design based on specific structural characteristics, and pressure is difficult to apply when patching complex aluminum alloy structures with three or more sides. Chinese patent CN202211679958.9 discloses a pressurizing device for repairing composite material products. This method applies pressure through a mechanical structure and is mainly used for repairing composite material products, making it unsuitable for in-situ adhesive bonding repair of metal structures. Therefore, there is an urgent need to propose a new heating and pressurization method applicable to the repair of complex aluminum alloy structures using composite corner boxes on three, four, or even five sides, in order to solve the problems of inconsistent pressure and temperature on each side and the lack of universal tools and fixtures, thereby improving the quality of repair. Utility Model Content

[0003] To address the problems in the existing technology, this utility model provides a liquid thermo-pressurized synergistic loading device for patching and repairing complex aluminum alloy structures.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A liquid thermo-pressing co-loading device for patching and repairing complex aluminum alloy structures includes a support plate. A first pressure member or a second pressure member is installed on the top of the support plate. The first pressure member is installed on both sides of the support plate, and the second pressure member is installed at the top center of the support plate. Both the first and second pressure members are used to apply downward pressure to the support plate. A pressure-transmitting heating assembly is also provided at the bottom of the support plate for cooperation. The pressure-transmitting heating assembly is placed inside the repair structure for support during use.

[0006] Optionally, the first pressure component includes four pressure mechanisms, with two pressure mechanisms installed on each side of the support plate. Each pressure mechanism includes a connecting rod horizontally installed on the top of the support plate and a T-shaped tie rod vertically installed at one end of the connecting rod.

[0007] Optionally, one end of the connecting rod is connected to a rod sleeve, and the inside of the rod sleeve is provided with a first through hole for installing the T-shaped tie rod. The top end of the T-shaped tie rod passes through the inside of the first through hole from bottom to top and is connected to a positioning nut. The bottom of the T-shaped tie rod is connected to a tie rod head.

[0008] Optionally, the support plate is connected to supports on both sides of the top. The supports have a second through hole for mounting the connecting rod. The top of the supports has a limit hole. The limit hole is threaded with a limit bolt. The bottom end of the limit bolt can extend into the second through hole.

[0009] Optionally, the second pressure component includes a telescopic support rod, with universal joints connected to both the upper and lower ends of the support rod. A connecting flange is connected to the end of the universal joint away from the support rod. The lower connecting flange is connected to the top of the support plate, and the upper connecting flange is connected to the external force-bearing surface.

[0010] Optionally, the pressure-transmitting heating assembly includes a flexible pressure bag, with a liquid injection tube connected to one end of the top of the flexible pressure bag for injecting liquid into the bag, and a pressure gauge installed at the other end of the top for measuring the internal pressure. A heating rod and a thermocouple are also installed inside the flexible pressure bag, with one end of the heating rod and the thermocouple connected to a wire, and one end of the wire connected to a temperature controller.

[0011] Optionally, the flexible pressure bag can withstand temperatures exceeding 150°C and pressure exceeding 0.1 MPa.

[0012] The beneficial effects of this utility model are:

[0013] 1. Through simple telescopic support rods and T-shaped tie rods, it can provide pressure support for composite material patching and repair of complex aluminum alloy structures with three, four or even five sides. It is suitable for applying curing pressure to a variety of different structural features and has very strong structural adaptability.

[0014] 2. By utilizing the isotropic properties of the liquid and its heat-insulating effect, the curing pressure and temperature are uniformly transferred to the bonded structure, thereby improving the uniformity of pressure and temperature.

[0015] 3. The structure is easy to process, simple and convenient to operate, easy to carry, and can handle field repair operations and battlefield repair operations. Attached Figure Description

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the support structure of this utility model.

[0018] Figure 2 This utility model Figure 1 Side view.

[0019] Figure 3 This is a schematic diagram of the pressure transmission heating component of this utility model.

[0020] Figure 4 This is a schematic diagram of the connecting rod structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the T-shaped tie rod structure of this utility model.

[0022] Figure 6 This is a schematic diagram of the support plate structure of this utility model.

[0023] Figure 7 This is a schematic diagram of the structure of the first pressure component of this utility model.

[0024] Figure 8 This is a schematic diagram of the structure of the second pressure component of this utility model.

[0025] Figure 9 This is a schematic diagram of the installation of the pressure-transmitting heating component and repair structure of this utility model.

[0026] Figure 10 This is a schematic diagram of the installation of the composite material corner box and repair structure of this utility model.

[0027] In the diagram: 1. Support plate; 2. Connecting rod; 3. T-shaped tie rod; 4. Support; 5. Support rod; 6. Connecting flange; 7. Universal joint; 8. Rod sleeve; 9. Tie rod head; 10. Positioning nut; 11. Flexible pressure bag; 12. Injection tube; 13. Heating rod; 14. Thermocouple; 15. Temperature controller; 16. Pressure gauge; 17. Wire; 18. Repair structure; 19. Fastener; 20. Composite material corner box; 21. Sheath; 22. First perforation; 23. Limiting hole; 24. Second perforation. Detailed Implementation

[0028] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] Please see Figure 1-10As shown, a liquid thermo-pressing co-loading device for patching and repairing complex aluminum alloy structures includes a support plate 1. A first pressure member or a second pressure member is installed on the top of the support plate 1. The first pressure member is installed on both sides of the support plate 1, and the second pressure member is installed at the top center of the support plate 1. Both the first and second pressure members are used to apply downward pressure to the support plate 1. A pressure-transmitting heating assembly is also provided at the bottom of the support plate 1 for cooperative use. When in use, the pressure-transmitting heating assembly is placed inside the repair structure 18 for support.

[0030] As a technical optimization of this utility model, the first pressure component includes four sets of pressure mechanisms. Two sets of pressure mechanisms are installed on each side of the support plate 1. Each set of pressure mechanisms includes a connecting rod 2 horizontally installed on the top of the support plate 1 and a T-shaped tie rod 3 vertically installed at one end of the connecting rod 2. One end of the connecting rod 2 is connected to a rod sleeve 8. A first through hole 22 for installing the T-shaped tie rod 3 is provided inside the rod sleeve 8. The top end of the T-shaped tie rod 3 passes through the first through hole 22 from bottom to top and is connected to a positioning nut 10. The bottom of the T-shaped tie rod 3 is connected to a tie rod head 9. After the bottom of the T-shaped tie rod 3 is engaged with the fastener through the tie rod head 9, the pressure applied by the connecting rod 2 to the support plate 1 can be adjusted by turning the positioning nut 10.

[0031] As a technical optimization of this utility model, the top two sides of the support plate 1 are connected to supports 4. A second through hole 24 for mounting the connecting rod 2 is provided inside the support 4. A limiting hole 23 is provided at the top of the support 4, and a limiting bolt is threaded into the limiting hole 23. The bottom end of the limiting bolt can extend into the second through hole 24. The support 4 facilitates the mounting of the connecting rod 2 on the top of the support plate 1, and the limiting hole 23 and the limiting bolt facilitate adjustment of the position of the connecting rod 2 and limit its movement.

[0032] As a technical optimization of this utility model, the second pressure component includes a retractable support rod 5. Both the upper and lower ends of the support rod 5 are connected to universal joints 7. The end of the universal joint 7 furthest from the support rod 5 is connected to a connecting flange 6. The lower connecting flange 6 is connected to the top of the support plate 1, and the upper connecting flange 6 is connected to the external force-bearing surface. The external force-bearing surface is usually an integral structure with the structure being repaired 18, connected by the frame and beams of the machine body. When pressurizing the flexible pressure bag 11, the lower half of the support rod 5 is screwed. Since the entire support rod 5 is threaded, screwing one end adjusts the length of the support rod 5, thereby pressurizing the flexible pressure bag 11 through the support plate 1 until the pressure gauge 16 measures the pressure of the liquid inside the flexible pressure bag 11, reaching a preset value, at which point pressurization stops. During pressurization, the universal joint 7 can adjust the tilt angle of the support rod 5 to adapt to different usage requirements. The telescopic function of the support rod 5 is to accommodate different widths between the repair structure 18 and the force-bearing surface, and to facilitate pressure adjustment during use; the universal head 7 is to adapt to working conditions where the force-bearing surface and the repair structure 18 are not parallel, and to facilitate the rotation of the support rod 5 when it is turned, making the installation of the support rod 5 and subsequent length adjustment more convenient and unrestricted.

[0033] As a technical optimization of this utility model, the pressure-transmitting heating assembly includes a flexible pressure bag 11. One end of the flexible pressure bag 11 is connected to an injection tube 12 for injecting liquid into the bag, and the other end is equipped with a pressure gauge 16 for measuring the internal pressure. A heating rod 13 and a thermocouple 14 are also installed inside the flexible pressure bag 11. One end of each of the heating rod 13 and thermocouple 14 is connected to a wire 17, and one end of the wire 17 is connected to a temperature controller 15. The temperature controller 15 can control the operation of the heating rod 13, enabling it to heat the internal liquid to a preset temperature. The thermocouple 14 can monitor the internal liquid temperature in real time to ensure heating accuracy.

[0034] As a technical optimization of this utility model, the flexible pressure bag 11 has a heat resistance and pressure resistance exceeding 150°C and 0.1MPa, respectively. The material of the flexible pressure bag 11 is a flexible material that can withstand a temperature of approximately 150°C and a pressure of 0.1MPa; the boiling point of the heat transfer and pressure transfer fluid inside the flexible pressure bag 11 should be higher than 150°C to meet the curing temperature requirements of commonly used adhesives.

[0035] In use, taking the composite material corner box 20 for bonding and repair, and the interior of the repair structure 18 as a rectangular body as an example, a composite material corner box 20 for repair is placed at one end of the interior of the repair structure 18 to be repaired. One side of the composite material corner box 20 is coated with an adhesive that needs to be cured, and after the adhesive cures, it connects to the inner wall of the repair structure 18. Then, a flexible pressure bag 11 is placed inside the repair structure 18, with the end containing the sheath 21 away from the composite material corner box 20. Then, a preset amount of heat transfer and pressure transfer fluid (which can be silicone oil) is added into the flexible pressure bag 11 through the injection tube 12. Finally, a support plate 1 is placed on top of the flexible pressure bag 11. After the support plate 1 is placed, the injection tube 12 and the pressure gauge 16 need to be exposed. Figure 7 and Figure 8 As shown, this does not affect its normal use. In actual use, the interior of the repair structure 18 may be an irregularly shaped polyhedron. The repair material is applied to the surface requiring repair, and the deformable nature of the flexible pressure bag 11 allows for sufficient pressure to be applied inside the repair structure 18, achieving a better repair effect and good adaptability. In this embodiment, the repair structure 18 is a four-sided composite material corner box, therefore the flexible pressure bag 11 has a cube-like configuration. The flexible pressure bag 11 is a flexible liquid bag with a certain deformation capacity. Its material can be silicone rubber. After being filled with liquid, it can deform to a certain extent during pressurization through liquid flow, adapting to relatively simple polyhedron shapes. When the repaired structure 18 is a complex, irregular polyhedron, a flexible pressure bag 11 with a corresponding configuration can be customized.

[0036] Next, select either a first pressure member or a second pressure member on the top of the support plate 1 according to the actual structure of the repair structure 18. If the outer wall of the repair structure 18 has fasteners 19 such as rivets or bolts, then select the first pressure member. If the outer wall does not have fasteners 19 such as rivets or bolts, then select the second pressure member.

[0037] When selecting the first pressure component, two supports 4 are installed on both sides of the top of the support plate 1 according to the position of the fasteners 19 such as rivets and bolts. Both sides of the supports 4 are connected to the support plate 1 by screws. Multiple sets of screw holes at different positions are provided on both sides of the top of the support plate 1 to facilitate the installation of supports 4 in different positions and adapt to the usage requirements of different repair structures 18. One end of the connecting rod 2 is passed through the second through hole 24. After adjusting the position of the rod sleeve 8, the limiting bolt is tightened. The bottom end of the limiting bolt abuts against the outer wall of the connecting rod 2, limiting the connecting rod 2 and keeping it stable inside the second through hole 24. Then, the top end of the T-shaped tie rod 3 is passed through the first through hole 22, and a positioning nut 10 is threaded onto the outer wall. The tie rod head 9 at the bottom of the T-shaped tie rod 3 is engaged between the fasteners 19 such as rivets and bolts on the outer wall of the repair structure 18. Figure 7As shown. Tightening the positioning nut 10 downwards applies pressure to the sleeve 8 and the connecting rod 2, which in turn applies pressure to the support plate 1 and the flexible pressure bag 11 below it through the connecting rod 2. Tightening the four positioning nuts 10 evenly continues until the pressure gauge 16 measures that the pressure of the liquid inside the flexible pressure bag 11 has reached the preset value, at which point the tightening of the positioning nuts 10 is stopped.

[0038] When using the second pressure component, the connecting flange 6 is connected and fixed to the top of the support plate 1 with screws, such as... Figure 8 As shown. Then, the top connecting flange 6 is connected to the adjacent load-bearing surface using screws (the load-bearing surface is mainly used to limit and support one end of the support rod 5, facilitating subsequent adjustment of the length of the support rod 5, allowing pressure to be applied to the flexible pressure bag 11 from below). By turning the support rod 5, the length of the support rod 5 is adjusted to apply pressure to the support plate 1 until the pressure gauge 16 measures that the pressure of the liquid inside the flexible pressure bag 11 reaches the preset value, at which point the pressure application stops.

[0039] After the pressure inside the flexible pressure bag 11 reaches a preset value by applying pressure to the support plate 1 using either the first or second pressure component, the heating rod 13 is controlled by the temperature controller 15 to heat the liquid inside the flexible pressure bag 11 until it reaches the preset temperature. The liquid is then kept warm and allowed to cool naturally for a preset time until curing is complete. After the preset time of pressurization and heating, the adhesive is cured, and the composite material corner box 20 is tightly fitted to the inner wall of the repair structure 18. The first or second pressure component is then removed from the support plate 1, and the support plate 1 is removed from the top of the flexible pressure bag 11. The flexible pressure bag 11 is then removed from the inside of the repair structure 18, and the liquid inside is drained through the injection tube 12 on the flexible pressure bag 11. A sealing cap is threaded onto the end of the injection tube 12 to seal the injection tube 12 and prevent the liquid inside the flexible pressure bag 11 from leaking out. When it is necessary to add or drain liquid into the flexible pressure bag 11, simply unscrew the cap to allow the injection tube 12 to be used normally.

[0040] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A liquid thermo-pressurized co-loading device for patching and repairing complex aluminum alloy structures, comprising a support plate (1), characterized in that, The top of the support plate (1) is equipped with a first pressure member or a second pressure member. The first pressure member is installed on both sides of the support plate (1), and the second pressure member is installed at the top middle of the support plate (1). Both the first pressure member and the second pressure member are used to apply downward pressure to the support plate (1). The bottom of the support plate (1) is also provided with a pressure transmitting heating assembly for use. When in use, the pressure transmitting heating assembly is placed inside the repair structure (18) for support.

2. The liquid thermo-pressurized synergistic loading device for patching and repairing complex aluminum alloy structures according to claim 1, characterized in that, The first pressure component includes four pressure mechanisms. Two pressure mechanisms are installed on each side of the support plate (1). Each pressure mechanism includes a connecting rod (2) installed horizontally on the top of the support plate (1) and a T-shaped tie rod (3) installed vertically at one end of the connecting rod (2).

3. The liquid thermo-pressurized synergistic loading device for patching and repairing complex aluminum alloy structures according to claim 2, characterized in that, One end of the connecting rod (2) is connected to a rod sleeve (8), and the inside of the rod sleeve (8) is provided with a first through hole (22) for installing the T-shaped tie rod (3). The top end of the T-shaped tie rod (3) passes through the inside of the first through hole (22) from bottom to top and is connected to a positioning nut (10). The bottom of the T-shaped tie rod (3) is connected to a tie rod head (9).

4. The liquid thermo-pressurized synergistic loading device for patching and repairing complex aluminum alloy structures according to claim 3, characterized in that, The support plate (1) is connected to a support (4) on both sides of the top. The support (4) has a second through hole (24) for installing the connecting rod (2) through it. The support (4) has a limit hole (23) at the top. The limit hole (23) is threaded with a limit bolt. The bottom end of the limit bolt can extend into the second through hole (24).

5. The liquid thermo-pressurized synergistic loading device for patching and repairing complex aluminum alloy structures according to claim 1, characterized in that, The second pressure component includes a telescopic support rod (5), with universal joints (7) connected to both the upper and lower ends of the support rod (5). A connecting flange (6) is connected to the end of the universal joint (7) away from the support rod (5). The lower connecting flange (6) is connected to the top of the support plate (1), and the upper connecting flange (6) is connected to the external force-bearing surface.

6. The liquid thermo-pressurized synergistic loading device for patching and repairing complex aluminum alloy structures according to claim 1, characterized in that, The pressure-transmitting heating assembly includes a flexible pressure bag (11), with a liquid injection tube (12) connected to one end of the top of the flexible pressure bag (11) for injecting liquid into the interior, and a pressure gauge (16) for monitoring the internal liquid pressure installed at the other end of the top. A heating rod (13) and a thermocouple (14) are also installed inside the flexible pressure bag (11). One end of the heating rod (13) and the thermocouple (14) are connected to a wire (17), and one end of the wire (17) is connected to a temperature controller (15).

7. The liquid thermo-pressurized synergistic loading device for patching and repairing complex aluminum alloy structures according to claim 6, characterized in that, The flexible pressure bag (11) has a heat resistance and a pressure resistance exceeding 150°C and 0.1 MPa, respectively.

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