Detection device for testing stress distribution of connecting point of skin piece of unmanned aerial vehicle

Abstract

The invention relates to the technical field of unmanned aerial vehicles, and provides a detection device for testing stress distribution of connecting points of skin parts of an unmanned aerial vehicle. The device comprises a support frame, a skeleton simulation piece, a pulley block, a counterweight module and a deformation detection structure. The bottom surface of the skeleton simulation member is fixed on the support frame, and the upper surface is provided with screw holes connected with the skin member. The pulley block is fixed on the supporting frame and is positioned above the framework simulation piece; the rope belt assembly comprises a plurality of rope belts, one end of each rope belt is fixedly connected with the tension transmission part of the skin piece, and the other end of each rope belt exerts stable tension through the balance weight module. The deformation detection structure comprises a three-layer composite structure used for primary detection and a detection adhesive tape structure used for secondary detection. The three-layer composite structure comprises an outer adhesive layer and a middle deformation detection adhesive layer. The device is simple in structure and convenient to operate, staged accurate detection of stress distribution of the connection points and visual detection of sealing performance can be achieved, the detection result is visual and reliable, and detection materials can be repeatedly used.

Description

Technical Field

[0001] The invention relates to the technical field of unmanned aerial vehicle manufacturing, and in particular to a detection device for testing stress distribution at connection points of unmanned aerial vehicle skin components. Background Art

[0002] Drones come in many types and specifications, including portable tactical reconnaissance drones and reconnaissance and strike drones with large payloads. Compared with civilian drones, drones face more complex and harsh working environments and need to maintain good performance under harsh conditions such as high altitude, high cold, and high humidity. The cabin of a drone usually contains multiple skin components, such as Figure 1~2 A typical skin part 01 shown (oblique top view and oblique side view) is made of glass fiber reinforced composite material, in an irregular shell shape, with an irregular hollow area in the middle. The hollow area is used to form an independent closed space, which can be used to install important mission payloads or functional components, such as optoelectronic pods, reconnaissance equipment, etc.

[0003] In order to ensure the structural strength and rigidity of the skin part, metal reinforcements are usually embedded inside the edge of the hollow area. The bottom surface of the edge of the hollow area of ​​the skin part 01 needs to fit tightly with the upper surface of the cabin frame, and its edge wall 04 and the inner side surface 05 of the cabin frame are in the same vertical plane. The design of this connection structure must not only ensure the structural integrity during flight, but also ensure the sealing performance in various harsh environments. Due to the large connection area and complex shape, the reasonable distribution of the connection points directly affects the reliability of the overall structure. In engineering practice, it is necessary to conduct mechanical property tests on the skin part to verify its overall strength characteristics, especially to evaluate the rationality of the edge connection structure of the hollow area, that is, whether the deformation and dislocation of each connection point are uniform and within the allowable range under the preset tension. In addition, with the improvement and upgrade of the UAV model or the structural adjustment, the design parameters of the skin part 01, such as the location, number, and skin thickness of the connection points, also need to be adjusted accordingly. This requires that the performance test of the skin part 01 has good repeatability so that the optimal design solution can be obtained through multiple tests and adjustments.

[0004] For newly developed UAV skin parts, the design of their connection structure needs to go through repeated testing and optimization processes. On the one hand, it is necessary to ensure that the deformation of each connection point meets the requirements under the preset tension; on the other hand, the number of connection points should be reduced as much as possible. This is because each connection point requires a mounting hole to be opened on the skin part and a connector to be set, which will not only affect the reliability of the connector due to harsh environments such as high altitude, low pressure, high humidity, and high cold, but also due to the discontinuity of the material, it will also destroy the overall structural strength of the skin part to a certain extent. Therefore, it is particularly important to optimize the number and position arrangement of the connection points while meeting the strength and stiffness requirements.

[0005] The commonly used test method is to use multiple micrometers to measure the deformation of key points while applying tension to the skin parts. Figure 3 This method has the following defects: First, due to the limited number of measuring points, it is difficult to fully reflect the stress distribution in the connection area; second, the installation and debugging process of the micrometer is cumbersome, and the test efficiency is low; third, the measurement results are easily affected by external vibration and temperature changes, and the reliability is not high; finally, for optimization tests that need to be repeated, this method is complicated to operate and it is difficult to ensure the consistency of test conditions. These problems are particularly prominent in the process of UAV model improvement and structural optimization, which seriously affects the efficiency and accuracy of design optimization. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art. The present invention provides a detection device for testing the stress distribution of the connection points of UAV skin parts. Through the support frame and the adjustable loading mechanism in conjunction with the three-layer composite structure and the temperature-sensitive detection tape structure, the staged and precise detection of the stress distribution of the connection points and the visual detection of the sealing performance are realized. The device has the characteristics of simple structure, convenient operation, sensitive detection, intuitive results and reusability, and provides reliable technical support for the optimized design of the connection structure of UAV skin parts.

[0007] In order to solve the above problems, the present invention adopts the following solution: a detection device for testing the stress distribution of the connection points of the UAV skin parts, comprising: A support frame; a skeleton simulation part, the bottom surface of which is fixedly connected to the support frame, and the upper surface of which is evenly and circumferentially provided with closely arranged screw holes; a pulley block, including a plurality of pulleys, fixed to the support frame and located above the skeleton simulation part; a rope assembly, including a plurality of ropes, each rope being wound around a corresponding pulley block in turn; a counterweight module, including a plurality of adjustable counterweight blocks; a deformation detection structure, arranged between the wall along the hollow area of ​​the skin part to be tested and the inner side surface of the skeleton simulation part; The deformation detection structure includes: a first three-layer composite structure used for initial detection, including: a first adhesive layer, fixedly bonded to the skin component; a second adhesive layer, fixedly bonded to the skeleton simulation component; a first deformation detection adhesive layer, arranged between the first adhesive layer and the second adhesive layer, remaining intact within a preset deformation range, and being cut into a strip-shaped independent detection segment of a preset width.

[0008] The beneficial effects of this technical solution are: a stable and reliable test platform is realized through the cooperation of the support frame and the skeleton simulation part, the setting of the pulley group and the rope belt assembly makes the application of tension more flexible and accurate, and the three-layer composite detection structure can intuitively display the deformation situation, which is convenient for judging the rationality of the distribution of connection points.

[0009] Preferably, the pulley block includes: a fixed frame fixed to the support frame by an adjustable bolt assembly, and the front, rear, left, and right positions of the fixed frame in the horizontal plane are adjustable. The beneficial effect of this technical solution is that the fixed frame of the pulley block can be adjusted in the horizontal plane, which improves the flexibility of the tension application direction, enables the test device to adapt to skin parts of different sizes and shapes, and realizes more accurate test control.

[0010] Preferably, each rope in the rope assembly includes: a flexible steel wire rope; a tension transmission component, including: a connection seat, fixed to the upper surface of the skin member by bolts; a ring, arranged on the upper surface of the connection seat; a rotating ring, one end of which is movably connected to the ring to form a universal joint, and the other end is provided with a clamping structure for clamping the steel wire rope. The beneficial effects of this technical solution are: the use of flexible steel wire rope improves the stability of tension transmission, and the universal joint structure realizes all-round adaptive adjustment of the tension direction, ensuring that the rope is always in an ideal stress state during the test, and improving the accuracy and reliability of the test.

[0011] Preferably, the deformation detection structure further includes: a second three-layer composite structure for re-detection, including: a third adhesive layer and a fourth adhesive layer, made of the same material as the first three-layer composite structure; a second deformation detection adhesive layer, which remains intact within a deformation range of 0.8-1%, and is cut into a strip-shaped independent detection segment 2 with a width of 2-4mm. The beneficial effects of this technical solution are: the second three-layer composite structure provides higher detection sensitivity, and a finer detection segment width improves detection accuracy, which is suitable for precise detection requirements after the connection structure is optimized, making the test results more accurate and reliable.

[0012] A detection device for testing stress distribution at connection points of skin parts of unmanned aerial vehicles, comprising: a support frame; a skeleton simulation part, the bottom surface of which is fixedly connected to the support frame, and the upper surface of which is evenly and circumferentially provided with closely arranged screw holes, the screw holes being used to cooperate and fix with the connection holes of the skin part; a pulley block, comprising a plurality of pulley groups, each pulley group being fixed on the support frame and located above the skeleton simulation part, and the height of the pulleys being adjustable; a rope belt assembly, comprising a plurality of rope belts, each rope belt being sequentially wound around a corresponding pulley group in the pulley block, one end of each rope belt being fixedly connected to a tension transmission component arranged on the upper surface of the skin part, and the other end being a hanging end; a counterweight module, comprising a plurality of adjustable counterweight blocks, each counterweight block being respectively hung at the hanging end of each of the rope belts; and a deformation detection structure, which is arranged between the wall along the hollow area of ​​the skin part and the inner side surface of the skeleton simulation part; The deformation detection structure includes a detection tape structure, which includes a flexible frame and a plurality of independent detection units arranged in the flexible frame. The detection units are arranged uniformly at a predetermined interval through the flexible frame, wherein each detection unit includes an upper section, a middle section and a lower section, the upper section and the lower section are made of high-strength adhesive materials, the middle section is made of a paper material with a preset breaking strength, the upper section is used to tightly bond with the hollow area of ​​the skin part along the wall, and the lower section is used to tightly bond with the inner side of the skeleton simulation part. The beneficial effects of this technical solution are: innovatively using a detection tape structure for stress distribution detection, ensuring uniform distribution of detection units through a flexible frame, and the three-section detection unit design ensures reliable bonding and detection effects, realizing a simpler and more practical detection method.

[0013] Preferably, the predetermined spacing of the detection units is 3-4 mm. The beneficial effects of this technical solution are: the predetermined spacing of 3-4 mm ensures the continuity of detection, provides a suitable spatial resolution, facilitates observation and recording of detection results, and provides standardized technical parameters for the test process.

[0014] Preferably, the fracture deformation of the middle section is 1.0-1.2% under dry conditions. The beneficial effects of this technical solution are: clearly defining the fracture deformation range under dry conditions, providing a standardized detection reference value, facilitating the judgment of the performance of the connection structure, and making the test results comparable and repeatable.

[0015] Preferably, the fracture deformation of the middle section after the wetting treatment is 0.5-0.8%. The beneficial effects of this technical solution are: improving the detection sensitivity through the wetting treatment, expanding the application range of the detection device, meeting the detection needs of different precision requirements, and enhancing the adaptability and flexibility of the detection method.

[0016] Preferably, it also includes an air supply device for blowing hot air from the outer joint of the skin part and the skeleton simulation part to the center; the middle section of the detection unit is made of temperature-sensitive material, which can present different colors according to temperature changes and is reversible. The beneficial effects of this technical solution are: innovatively introducing a hot air detection method, using temperature-sensitive materials to provide a new detection method, realizing visual detection of sealing performance, and improving the intuitiveness and convenience of detection.

[0017] Preferably, the temperature-sensitive material is light blue at room temperature, and the color gradually deepens to dark blue when the local temperature rises, and can restore the original color after the temperature drops. Its response time to temperature is 2-3 seconds. The beneficial effects of this technical solution are: it stipulates specific color change characteristics and fast response time, and the reversibility ensures the reuse of detection materials, significantly improves detection efficiency and economy, and realizes a more intelligent and environmentally friendly detection method.

[0018] Compared with the prior art, the technical solution of the present invention has the following advantages: Structural design: A combination of support frame, skeleton simulation parts, pulley blocks and rope assemblies, combined with an adjustable counterweight module, creates a stable and reliable test platform. This not only ensures the accuracy and uniformity of tension application, but also allows for flexible adjustment of test parameters according to skin parts of different sizes and shapes, thus improving the adaptability and versatility of the device.

[0019] In terms of detection methods: two detection schemes, a three-layer composite structure and a detection tape structure, were innovatively designed. The former realizes staged detection through deformation detection adhesive layers with different sensitivities, while the latter uses temperature-sensitive materials combined with hot air detection methods to realize visual detection. It not only meets the testing needs at different stages, but also provides intuitive and reliable test results, significantly improving the detection efficiency and accuracy.

[0020] In terms of practicality: the equipment is easy to operate, the test results are intuitive and reliable, and the test materials are reusable, which not only reduces the test cost but also improves the test efficiency; through standardized technical parameters and testing processes, the comparability and repeatability of the test results are ensured, providing reliable technical support for the optimized design of the connection structure of UAV skin parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the figures required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the figures described below are only some embodiments of the present application. For ordinary technicians in this field, other figures can be obtained based on these figures without paying creative work.

[0022] Figure 1 It is a structural diagram of the skin component from an oblique top-down angle; Figure 2 It is a structural diagram of the skin component from an oblique side view angle; Figure 3 It is a schematic diagram of using a micrometer to perform measurement in the prior art; Figure 4 yes Figure 3 The enlarged view of the part at A in the middle shows the specific measurement position of the micrometer; Figure 5 is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 6 It is a structural schematic diagram of a skeleton simulation component; Figure 7 is a cross-sectional schematic diagram of the first three-layer composite structure in Example 1; Figure 8 is a cross-sectional schematic diagram of the second three-layer composite structure in Example 1; Fig. 9 is a schematic structural diagram of the detection tape structure in Example 2; Fig.10 is a schematic diagram of the state after the detection tape structure is installed and the flexible frame is torn off in Example 2; Fig.11 yes Figure 5 The partial enlarged view of B in the middle shows the connection structure of the rope and belt assembly.

[0023] Reference numerals: Main structure: support frame 20 / skeleton simulation part 10 / skin part 01 / screw hole 03 / hollow area along the wall 04 / inner side 05; Loading part: pulley block 30 / fixed frame 31 / rope belt assembly 40 / flexible wire rope 41 / connecting seat 42 / circular ring 43 / rotating ring 44 / counterweight module 50; Detection structure: deformation detection structure 60 / first three-layer composite structure 61 / first adhesive layer 611 / second adhesive layer 612 / first deformation detection adhesive layer 613 / strip-shaped independent detection segment one 06 / second three-layer composite structure 62 / third adhesive layer 621 / fourth adhesive layer 622 / second deformation detection adhesive layer 623 / strip-shaped independent detection segment two 07; detection tape structure 63 / flexible frame 631 / detection unit 632 / upper segment 632a / middle segment 632b / lower segment 632c. DETAILED DESCRIPTION

[0024] The following will be combined Figure 1-Figure 11 The preferred embodiments of the present invention are described in detail. It should be noted that the following description is only a preferred embodiment of the present invention, rather than a limitation of the present invention. Those skilled in the art should understand that various modifications and variations can be made to the present invention without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0025] Embodiment 1: The present invention provides a detection device for testing the stress distribution of the connection points of the skin parts of an unmanned aerial vehicle. Figure 4-5 As shown, the detection device comprises: Support frame 20; The skeleton simulation part 10 has a structure simulating the cabin skeleton, and its bottom surface is fixedly connected to the support frame 20. Its upper surface is evenly and circumferentially provided with closely arranged screw holes 03, and the screw holes 03 are used to cooperate with the connection holes of the skin part 01 for fixed connection. By selecting screw holes 03 at different positions to connect with the skin part 01, it is convenient to adjust the number and distribution of connection points; The pulley block 30 includes a plurality of pulleys, each of which is fixed to the support frame 20 according to the requirements of the tension transmission path. Each pulley block is located above the skeleton simulation part 10 and has an adjustable height, and is used to apply a stable tension to the upper surface of the skin part 01; wherein, referring to Figure 5 As shown, the pulley block 30 includes: a fixing frame 31, which is fixed to the support frame 20 by an adjustable bolt assembly. Furthermore, the adjustable bolt assembly is provided with an adjustment slot, and the position of the fixing frame 31 in the horizontal plane in four directions of front, back, left, and right can be adjusted by adjusting the position of the bolt in the adjustment slot, and is locked and fixed by a nut. The adjustable structural design of the pulley block 30 enables the position, direction, and magnitude of the tension to be flexibly adjusted according to the test requirements, thereby more accurately simulating the tension distribution state of the skin component 01 under actual working conditions; The rope assembly 40 includes a plurality of ropes, each of which is sequentially wound around a corresponding pulley block in the pulley block 30, one end of each rope is fixedly connected to a tension transmission component arranged on the upper surface of the skin member 01, and the other end is a hanging end for hanging a counterweight; wherein, referring to Figure 5 and Fig.11 As shown, each rope belt adopts a flexible steel wire rope 41, which has sufficient strength and flexibility; the tension transmission component includes: a connecting seat 42, which is fixed to a preset position on the upper surface of the skin member 01 by bolts, and a circular ring 43 for adjusting the tension direction is provided on the upper surface of the connecting seat 42; a rotating ring 44, one end of which is movably connected with the circular ring 43 to form a universal joint, and the other end is provided with a clamping structure for clamping and fixing the steel wire rope 41; the tension transmission structure realizes all-round adaptive adjustment of the tension direction through the cooperation of the circular ring 43 and the rotating ring 44, ensuring that the steel wire rope 41 is always in a tensioned state during the test; The counterweight module 50 includes a plurality of adjustable counterweight blocks, each of which is suspended at a suspension end of each rope belt, and is used to apply a preset constant tension; And: a deformation detection structure 60 , which is arranged between the hollow area along the wall 04 of the skin component 01 and the inner side surface 05 of the skeleton simulation component 10 .

[0026] The deformation detection structure 60 adopts different structural forms according to different detection stages: A. In the initial detection stage of the skin component 01, since the number of connection points is relatively small, it is necessary to detect a larger range of deformation and / or misalignment. At this time, the deformation detection structure 60 adopts the first three-layer composite structure 61; B. In the second and multiple detection stages after adding connection points based on the initial detection results, the increase in connection points leads to a decrease in local stress and the detection sensitivity needs to be improved. At this time, the deformation detection structure 60 can select the second three-layer composite structure 62.

[0027] Specifically, the first three-layer composite structure 61, referring to Figure 7 , including: a first adhesive layer 611 fixedly bonded to the hollow area of ​​the skin part 01 along the wall 04, a second adhesive layer 612 fixedly bonded to the inner side 05 of the skeleton simulation part 10, and a first deformation detection adhesive layer 613 bonded between the first adhesive layer 611 and the second adhesive layer 612; wherein, the first adhesive layer 611 and the second adhesive layer 612 are both made of high-strength epoxy resin structural adhesive, whose tensile strength and tensile modulus are selected according to design requirements, and the elongation at break is less than 2% to ensure a firm connection with the substrate; the first deformation detection adhesive layer 613 adopts a modified epoxy system, and its material formula is specially formulated so that it can maintain structural integrity within a deformation range of 1.5-2%, for example, and break when it exceeds this range, and the first deformation detection adhesive layer 613 is in a partially cured state, and is vertically cut into strip-shaped independent detection segments 06 with a width of 3-5mm and a spacing of 2-3mm along the hollow edge by a blade or other cutting tool, and each detection segment is evenly arranged.

[0028] Specifically, the second three-layer composite structure 62, referring to Figure 8 , including: a third adhesive layer 621 fixedly bonded to the hollow area of ​​the skin part 01 along the wall 04, a fourth adhesive layer 622 fixedly bonded to the inner side 05 of the skeleton simulation part 10, and a second deformation detection adhesive layer 623 bonded between the third adhesive layer 621 and the fourth adhesive layer 622; wherein the third adhesive layer 621 and the fourth adhesive layer 622 adopt the same high-strength epoxy resin structural adhesive as the first three-layer composite structure 61 to maintain the comparability of the test data; the second deformation detection adhesive layer 623 adopts a modified epoxy system, but its material formula is adjusted compared with the first deformation detection adhesive layer 613, so that it has higher sensitivity, that is, for example, the structure is kept intact within the deformation range of 0.8-1%, and it breaks when it exceeds this range, and the second deformation detection adhesive layer 623 is vertically cut into strip-shaped independent detection segments 07 with a width of 2-4mm and a spacing of 2-3mm along the hollow edge by a blade or other cutting tool in a partially cured state, and each detection segment is evenly arranged.

[0029] In the specific testing process, the hollow area along the wall 04 of the skin part 01 and the inner side 05 of the skeleton simulation part 10 are first polished and cleaned to ensure that the surface is free of oil stains. During the initial test, fewer screw holes 03 are selected to connect and fix with the skin part 01, and the first three-layer composite structure 61 is set between the connecting surfaces. After the first three-layer composite structure 61 is completely cured, the preset stable tension is applied to the skin part 01 through the rope assembly 40 and the counterweight module 50, and the fracture condition of each test section 06 is observed.

[0030] When a detection section 06 breaks somewhere, it indicates that the deformation of the area has exceeded the allowable range of 1.5-2%, and it is necessary to add a connection point near the area. After determining the location where the connection point needs to be added based on the initial test results, replace the new connection bolts and arrange the second three-layer composite structure 62 for re-testing. Since the second deformation detection adhesive layer 623 has a higher sensitivity and can break when the deformation reaches 0.8-1%, the rationality of the connection structure can be evaluated more accurately.

[0031] During the test, the tension can be adjusted by adjusting the weight of each counterweight block in the counterweight module 50, thereby simulating the tension distribution under different working conditions. The fracture conditions of each test segment can be recorded by photographing or recording, etc., for subsequent analysis and comparison. Repeat the test and optimization until all test segments 207 remain intact under the preset tension, indicating that the connection structure meets the design requirements.

[0032] Embodiment 2: This embodiment provides a solution for stress distribution detection using a special detection tape structure 63. Fig. 9 As shown, the special detection tape structure 63 includes a flexible frame 631 and a plurality of independent detection monomers 632 arranged in the frame 631. Each detection monomer 632 is composed of an upper section 632a, a middle section 632b and a lower section 632c, wherein the upper section 632a and the lower section 632c are made of high-strength adhesive materials, and the middle section 632b is made of a special paper material with a preset breaking strength. The detection monomers 632 are evenly arranged at a predetermined spacing (such as 3-4mm) through the flexible frame 631.

[0033] When in use, firstly, the hollow area along the wall 04 of the skin part 01 and the inner side 05 of the skeleton simulation part 10 are surface treated. Then the detection tape structure 63 is pasted along the circumference of the connection surface, so that the upper section 632a of the detection monomer 632 is tightly bonded to the hollow area along the wall 04 of the skin part 01, and the lower section 632c is tightly bonded to the inner side 05 of the skeleton simulation part 10. After the bonding is stable, carefully tear off the flexible frame 631, and keep the evenly arranged detection monomers 632.

[0034] The characteristics of the detection tape structure 63 are that the middle section 632b of the detection unit 632 is made of a paper material with a specific formula, and its fracture characteristics and deformation amount have a good corresponding relationship. Under the standard state (dry condition), the fracture deformation amount of the middle section 632b is set within the range of 1.0-1.2%. When it is necessary to improve the detection sensitivity, the middle section 632b of the detection unit 632 can be appropriately moistened using a spray device, and the moistening degree can be adjusted according to the detection requirements. By controlling the moistening parameters, the fracture strain range of the middle section 632b can be reduced from 1.0-1.2% in the dry state to 0.5-0.8% in the moist state.

[0035] During the detection process, a preset tension is applied to the skin part 01 through the rope assembly 40 and the counterweight module 50. When the local deformation exceeds the preset range, the detection monomer 632 at the corresponding position will break at the middle section 632b. By observing the location and number of the breaks, the stress distribution of the connection structure can be intuitively judged. This detection method has the following characteristics: 1. Simple production process and low cost: The test tape can be mass-produced. The material is ordinary industrial paper with special treatment. It is easy to replace and suitable for repeated testing.

[0036] 2. Detection sensitivity is adjustable: Continuously adjustable sensitivity is achieved by adjusting the wetness of the middle section 632b; it is suitable for detection needs at different stages; and the detection parameters can be quickly adjusted according to actual needs.

[0037] 3. The results are intuitive and reliable: the fracture position is clearly visible, not affected by environmental vibration, and easy to record and analyze.

[0038] 4. Convenient operation: Integral design, easy installation and disassembly; no special tools and equipment are required; the detection process is simple and intuitive.

[0039] The detection method of this embodiment is particularly suitable for the later stage of connection structure optimization. By adjusting the wettability of the middle section 632b, accurate detection of subtle stress distribution can be achieved, providing a reliable basis for obtaining the optimal connection solution.

[0040] Embodiment 3: This embodiment provides a sealing performance testing solution. After completing the connection structure optimization of embodiment 2, a sealing gasket is set between the connection surface of the skin part 01 and the skeleton simulation part 10. At this time, it is necessary to evaluate the sealing performance of the connection structure under tension.

[0041] This embodiment uses an improved detection tape structure 63 for detection. In addition to maintaining the basic structure of embodiment 2, the detection tape structure 63 makes special improvements to the middle section 632b of the detection unit 632: it is made of a temperature-sensitive material, which is light blue at room temperature, and gradually deepens to dark blue when the local temperature rises. This temperature-sensitive material has good reversibility and can restore its original color when the temperature drops.

[0042] The detection steps are as follows: 1. Preprocessing: Clean the exposed edge area of ​​the gasket; The detection tape structure 63 is pasted along the circumference of the sealing line, and the detection monomers 632 are evenly distributed; Carefully tear off the flexible frame 631 and retain the evenly arranged detection units 632 .

[0043] 2. Loading: Applying a preset stable tension to the skin member 01 through the rope assembly 40 and the counterweight module 50; Use a camera or video device to record the initial state.

[0044] 3. Hot air detection: Slowly blow warm air from the joint between the skeleton simulation part 10 and the outer periphery of the skin part 01 toward the center; Keep the air flow temperature at around 40°C to ensure detection sensitivity; The entire detection process is recorded by video equipment.

[0045] When there is a small gap in the connection structure, hot air will leak through the gap, causing obvious color change in the middle section 632b of the local detection unit 632. This color change has the following characteristics: 1. Rapid response: the color change can be observed within 2-3 seconds when the temperature rises; 2. Accurate positioning: the color change only appears on the detection unit near the leakage location; 3. Reusable: after the detection is completed, the color automatically recovers as the temperature drops.

[0046] By analyzing the video records, the following information can be obtained: 1. The specific distribution of the leakage locations; 2. The time sequence of color changes, reflecting the severity of the leakage; 3. The expansion trend of the leakage range.

[0047] This detection method has the advantages of simple operation, low cost and intuitive results, and is particularly suitable for rapid detection and optimization of connection structures. According to the test results, the connection point distribution can be adjusted or the sealing gasket can be replaced in a targeted manner until the design requirements are met.

[0048] It should be pointed out that the material used for each adhesive layer in this article is only one of them. Technical personnel in this field can choose other material systems with similar mechanical properties according to actual application requirements, such as other types of modified epoxy resins, modified acrylic adhesives, etc., as long as they can meet the corresponding deformation detection requirements.

[0049] Although the present invention has been disclosed in conjunction with certain embodiments shown and described in detail, various modifications and improvements thereto will be readily apparent to those skilled in the art having benefit of the disclosure herein. Therefore, the spirit and scope of the present invention will not be limited by the foregoing examples, but will be understood in the broadest sense permitted by law.

Claims

1. A detection device for testing stress distribution at connection points of UAV skin components, characterized in that: include: A support frame (20); a skeleton simulation component (10), the bottom surface of which is fixedly connected to the support frame (20), and the upper surface of which is evenly and circumferentially provided with closely arranged screw holes (03); a pulley block (30), comprising a plurality of pulleys, fixed to the support frame (20) and located above the skeleton simulation component (10); a rope assembly (40), comprising a plurality of ropes, each rope being sequentially wound around a corresponding pulley block; a counterweight module (50), comprising a plurality of adjustable counterweight blocks; a deformation detection structure (60), arranged between a wall (04) along a hollow area of ​​a skin component (01) to be tested and an inner side surface (05) of the skeleton simulation component (10); The deformation detection structure (60) includes: a first three-layer composite structure (61) for initial detection, including: a first adhesive layer (611) fixedly bonded to the skin component (01); a second adhesive layer (612) fixedly bonded to the skeleton simulation component (10); a first deformation detection adhesive layer (613) arranged between the first adhesive layer and the second adhesive layer, remaining intact within a preset deformation range, and being cut into a strip-shaped independent detection segment (06) of a preset width.

2. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 1 is characterized in that: The pulley block (30) comprises: a fixing frame (31) fixed to the supporting frame (20) via an adjustable bolt assembly, and the front, rear, left and right positions of the fixing frame (31) in a horizontal plane are adjustable.

3. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 1 is characterized in that: Each rope in the rope assembly (40) comprises: Flexible steel wire rope (41); Tension transmission components, including: A connecting seat (42) fixed to the upper surface of the skin member (01) by means of bolts; A circular ring (43) is arranged on the upper surface of the connecting seat (42); A rotating ring (44) has one end movably connected to the circular ring (43) to form a universal joint, and the other end is provided with a clamping structure for clamping the steel wire rope (41).

4. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 1 is characterized in that: The deformation detection structure (60) further comprises: a second three-layer composite structure (62) for further detection, comprising: The third adhesive layer (621) and the fourth adhesive layer (622) are made of the same material as the first three-layer composite structure; The second deformation detection adhesive layer (623) remains intact within a deformation range of 0.8-1%, and is cut into strip-shaped independent detection segments 2 (07) with a width of 2-4 mm.

5. A detection device for testing stress distribution at connection points of UAV skin components, characterized in that: include: A support frame (20); a skeleton simulation part (10), the bottom surface of which is fixedly connected to the support frame (20), and the upper surface of which is evenly and circumferentially provided with closely arranged screw holes (03), the screw holes (03) being used to cooperate and be fixedly connected with the connecting holes of the skin part (01); a pulley block (30), comprising a plurality of pulley groups, each pulley group being fixed on the support frame (20) and located above the skeleton simulation part (10), and the height of the pulleys being adjustable; a rope belt assembly (40), comprising a plurality of rope belts, each rope belt being sequentially wound around a corresponding pulley group in the pulley block (30), one end of each rope belt being fixedly connected to a tension transmission component arranged on the upper surface of the skin part (01), and the other end being a hanging end; a counterweight module (50), comprising a plurality of adjustable counterweight blocks, each counterweight block being respectively hung at the hanging end of each of the rope belts; and a deformation detection structure (60) disposed between the hollow area along the wall (04) of the skin component (01) and the inner side surface (05) of the skeleton simulation component (10); The deformation detection structure (60) includes a detection tape structure (63), and the detection tape structure (63) includes a flexible frame (631) and a plurality of independent detection units (632) arranged in the flexible frame (631). The detection units (632) are arranged uniformly at a predetermined interval through the flexible frame (631), wherein each detection unit (632) includes an upper section (632a), a middle section (632b) and a lower section (632c). The upper section (632a) and the lower section (632c) are made of high-strength adhesive material, and the middle section (632b) is made of paper material with a preset breaking strength. The upper section (632a) is used to be tightly bonded to the hollow area of ​​the skin component (01) along the wall (04), and the lower section (632c) is used to be tightly bonded to the inner side (05) of the skeleton simulation component (10).

6. The detection device for testing stress distribution at connection points of UAV skin components according to claim 5, characterized in that: The predetermined spacing between the detection units is 3-4 mm.

7. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 5, characterized in that: The fracture deformation of the middle section is 1.0-1.2% under dry conditions.

8. The detection device for testing stress distribution of connection points of UAV skin components according to claim 7, characterized in that: The fracture deformation of the middle section after the wetting treatment is 0.5-0.8%.

9. The detection device for testing stress distribution of connection points of UAV skin parts according to claim 5, characterized in that: It also includes an air supply device for blowing hot air from the peripheral joint of the skin part (01) and the skeleton simulation part (10) to the center; The middle section (632b) of the detection unit (632) is made of a temperature-sensitive material, which can present different colors according to temperature changes and is reversible.

10. The detection device for testing stress distribution at connection points of skin components of an unmanned aerial vehicle according to claim 9, characterized in that: The temperature sensitive material is light blue at room temperature, and its color gradually deepens to dark blue when the local temperature rises. It can restore its original color after the temperature drops, and its response time to temperature is 2-3 seconds.

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