Aerospace fastener anti-stretch detection device

Abstract

The utility model belongs to aerospace technology field, concretely relates to a kind of tensile resistance detection device for aerospace fastener, including detection platform, the both ends of detection platform top are all fixed with mounting plate, the side of two mounting plates mutually close is all fixed with hydraulic cylinder, the output end of two hydraulic cylinders is all fixed with clamp towards mutually close one end, the bottom of detection platform is installed vibration structure, vibration structure is used to control detection platform to vibrate, the side of detection platform is installed impact structure, impact structure is used to be fastener test impact resistance effect, vibration mechanism structure includes the bottom plate fixed in the lower part of detection platform, the four end angle positions of bottom plate top are all fixed with a first spring.The utility model can exert vibration and impact effect, and then make detection result more close to the real force performance of fastener in actual flight, greatly improve the accuracy of detection result, effectively avoid the misjudgment caused by detection not comprehensive.

Description

Technical Field

[0001] This utility model belongs to the field of aerospace technology, specifically relating to a tensile strength testing device for aerospace fasteners. Background Technology

[0002] In the aerospace field, the safe operation of aircraft highly depends on the reliability of its structure. Fasteners, as key components connecting various parts of an aircraft, directly affect the safety of the entire aircraft. During actual flight, aerospace fasteners endure extremely complex load environments. When an aircraft flies at high altitudes, it vibrates due to airflow fluctuations, and the vibrations of the fuselage structure are transmitted to various fasteners. During takeoff, landing, and encountering sudden changes in airflow, fasteners are also subjected to strong impact loads. At the same time, due to the operation of the aircraft's engines and the vibration of the wings, fasteners are also subjected to alternating loads and multi-directional stresses over a long period of time.

[0003] However, most common aerospace fastener tensile testing devices can only simulate simple axial tensile loads. For example, traditional tensile testing machines simply fix the fastener with a clamp and apply axial tension using a motor-driven screw or hydraulic cylinder. During the entire testing process, they cannot simulate complex working conditions such as vibration and impact. This single-condition testing method results in a significant deviation between the test results and the actual stress conditions of the fastener in the actual flight environment. Taking vibration as an example, vibration may cause dynamic changes in the tensile load originally borne by the fastener, and may even cause fatigue damage. Traditional testing devices cannot take this factor into account. Another example is impact load, whose instantaneous high-intensity force may cause fasteners to fail in the form of brittle fracture. Conventional testing methods are unable to capture these unique performance changes under impact.

[0004] Because existing testing equipment cannot fully simulate actual working conditions, the fasteners selected may experience serious problems such as loosening or breakage in actual use due to their inability to withstand complex loads, posing a huge safety hazard to aerospace flights. Utility Model Content

[0005] The purpose of this invention is to provide a tensile testing device for aerospace fasteners, which can apply vibration and impact effects to make the test results closer to the actual stress performance of the fasteners in actual flight, greatly improving the accuracy of the test results and effectively avoiding misjudgments caused by incomplete testing.

[0006] The specific technical solution adopted by this utility model is as follows:

[0007] A tensile strength testing device for aerospace fasteners includes a testing platform. Mounting plates are fixed at both ends of the top of the testing platform. Hydraulic cylinders are fixed on the side of the two mounting plates that are close to each other. Clamps are fixed at the output ends of the two hydraulic cylinders that face the side that is close to each other.

[0008] The bottom of the testing platform is equipped with a vibration structure, which is used to control the vibration of the testing platform. An impact structure is installed on one side of the testing platform, which is used to test the impact resistance of fasteners.

[0009] As a preferred technical solution of this utility model, the vibration mechanism structure includes a base plate fixed to the lower part of the detection platform, a first spring fixed at each of the four corner positions of the top of the base plate, a fixing column fixed at the top of the base plate and inside the first spring, a ring electromagnet fixed at the top of the fixing column, and an adsorption iron block with the same number and position as the first spring fixed at the bottom of the detection platform, and the first spring is fixedly connected to the adsorption iron block.

[0010] As a preferred technical solution of this utility model, the impact structure includes a mounting platform disposed on one side of the detection platform, and a support and moving mechanism is also installed on the side of the detection platform near the mounting platform. The support and moving mechanism is used to support the mounting platform and control the movement of the mounting platform.

[0011] A fixed frame is fixed to the top of the mounting platform, a sliding frame is slidably connected to the top of the fixed frame, a rack is fixed to one side of the sliding frame, a first motor is also fixed to the top of the mounting platform, and a half gear is fixed vertically upward at the output end of the first motor, and the half gear meshes with the rack.

[0012] A lower fixing plate is fixed to the bottom of the sliding frame near the detection platform, and a second spring is installed between the lower fixing plate and the fixing frame;

[0013] An impact rod is fixed to one end of the sliding frame near the detection platform, and an impact head is installed at the end of the impact rod away from the sliding frame.

[0014] As a preferred embodiment of this utility model, the lower fixing piece is fixed with a limit strip on the side close to the fixing frame and located inside the second spring, and the limit strip is slidably connected to the fixing frame.

[0015] As a preferred embodiment of this utility model, the support and moving mechanism includes two fixed plates fixed on the side of the detection platform near the mounting table, and a threaded rod is rotatably connected between the two fixed plates. At least one guide rod is fixed between the two fixed plates. A moving block is fixed at the bottom of the mounting table, and the moving block is threadedly connected to the threaded rod. The moving block is slidably connected to the guide rod. A second motor is installed on the side of one of the fixed plates away from the other fixed plate, and the output end of the second motor is connected to the threaded rod.

[0016] As a preferred embodiment of this utility model, an installation chamber is fixed at the end of the impact rod away from the sliding frame, and an installation block is fixed at the end of the impact head near the impact rod. The installation block is inserted into the installation chamber. A first magnet is provided on the outer side of the installation block, and a second magnet that attracts the first magnet is provided on the inner side of the installation chamber.

[0017] As a preferred embodiment of this utility model, a limiting rod is fixed at the top of the fixed column and inside the annular electromagnet, and a limiting groove corresponding to the limiting rod is provided at the bottom of the adsorption iron block.

[0018] As a preferred embodiment of this utility model, the top of the limiting rod is provided with a round head.

[0019] The technical effects achieved by this utility model are as follows:

[0020] This invention can apply vibration and impact effects while performing tensile testing on fasteners. By simulating vibration conditions, the performance changes of fasteners under the combined action of vibration and tension can be observed, accurately assessing their fatigue life and reliability in a vibration environment. Simulating impact effects can detect the fastener's fracture resistance when subjected to instantaneous high-intensity impact. This makes the test results closer to the actual stress performance of fasteners in actual flight, greatly improving the accuracy of the test results and effectively avoiding misjudgments caused by incomplete testing, thus providing a more reliable guarantee for the safe operation of aerospace vehicles. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure between the detection platform, the hydraulic cylinder, and the first spring in this utility model;

[0023] Figure 3 This is a schematic diagram of the structure between the first spring, the limiting rod, and the adsorption iron block in this utility model;

[0024] Figure 4 This is a schematic diagram of the structure between the threaded rod, the first motor, and the impact rod in this utility model;

[0025] Figure 5 This is a schematic diagram of the structure between the second spring, the sliding frame, and the impact head in this utility model;

[0026] Figure 6 This is a schematic diagram of the structure between the sliding frame, the half gear, and the rack in this utility model.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Testing platform; 2. Mounting plate; 3. Hydraulic cylinder; 4. Clamp; 5. Base plate; 6. First spring; 7. Fixed column; 8. Ring electromagnet; 9. Adsorption iron block; 10. Limiting rod; 11. Limiting groove; 12. Round head; 13. Mounting platform; 14. Fixed frame; 15. Sliding frame; 16. First motor; 17. Half gear; 18. Rack; 19. Lower fixing plate; 20. Second spring; 21. Limiting strip; 22. Impact rod; 23. Mounting chamber; 24. Impact head; 25. Mounting round block; 26. Fixed plate; 27. Threaded rod; 28. Moving block; 29. ​​Second motor; 30. Guide rod. Detailed Implementation

[0029] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0030] Example 1:

[0031] like Figures 1-3 As shown, a tensile strength testing device for aerospace fasteners includes a testing platform 1. Mounting plates 2 are fixed at both ends of the top of the testing platform 1. Hydraulic cylinders 3 are fixed on the side of the two mounting plates 2 that are close to each other. Clamps 4 are fixed at the output ends of the two hydraulic cylinders 3 that face the side that is close to each other.

[0032] When conducting a tensile test on a fastener, the fastener can be clamped by two clamps 4, and then two hydraulic cylinders 3 can be activated to retract the stroke rods of the hydraulic cylinders 3, thereby stretching the fastener and testing its tensile strength.

[0033] A vibration structure is installed at the bottom of the testing platform 1, which is used to control the vibration of the testing platform 1.

[0034] See attached document Figures 2-3The vibration mechanism structure includes a base plate 5 fixed to the lower part of the detection platform 1. A first spring 6 is fixed at each of the four corners of the top of the base plate 5. A fixing column 7 is fixed at the top of the base plate 5 and inside the first spring 6. A ring electromagnet 8 is fixed at the top of the fixing column 7. Adsorption iron blocks 9, which are the same number and position as the first spring 6, are fixed at the bottom of the detection platform 1. The first spring 6 and the adsorption iron blocks 9 are fixedly connected.

[0035] When conducting a tensile test on fasteners, the annular electromagnet 8 can be activated to attract the adsorbed iron block 9, causing the adsorbed iron block 9 to move the detection platform 1 downward, resulting in the compression of the first spring 6. Then, the annular electromagnet 8 is deactivated, causing it to release the adsorption of the adsorbed iron block 9. At this point, the adsorbed iron block 9 and the detection platform 1 are ejected upward by the first spring 6. By repeating the above operation, vibration can be generated simultaneously during the tensile test on the fasteners, making the test results closer to real-world conditions and avoiding significant deviations between the test results and the actual situation.

[0036] Example 2:

[0037] This embodiment is a further improvement on embodiment 1, as follows:

[0038] An impact structure is installed on one side of the testing platform 1. The impact structure is used to test the impact resistance of fasteners.

[0039] See attached document Figure 4 and attached Figure 6 The impact structure includes a mounting platform 13 disposed on one side of the detection platform 1, a fixing frame 14 fixed on the top of the mounting platform 13, a sliding frame 15 slidably connected to the top of the fixing frame 14, a rack 18 fixed on one side of the sliding frame 15, a first motor 16 fixed on the top of the mounting platform 13, and a half gear 17 fixed vertically upward at the output end of the first motor 16, and the half gear 17 meshes with the rack 18.

[0040] A lower fixing plate 19 is fixed to the bottom of the sliding frame 15 near the detection platform 1. A second spring 20 is installed between the lower fixing plate 19 and the fixing frame 14. Furthermore, a limit strip 21 is fixed to the side of the lower fixing plate 19 near the fixing frame 14 and inside the second spring 20. The limit strip 21 is slidably connected to the fixing frame 14. By setting the limit strip 21, the second spring 20 can be prevented from bending outward by the restriction of the lower fixing plate 19 when compressed.

[0041] An impact rod 22 is fixed at one end of the sliding frame 15 near the detection platform 1, and an impact head 24 is installed at the end of the impact rod 22 away from the sliding frame 15.

[0042] When conducting a tensile test on a fastener, an impact can be applied to the fastener. This drives a first motor 16, causing its output to rotate a half-gear 17. Through the meshing connection between the half-gear 17 and the rack 18, the half-gear 17 moves the rack 18 and the sliding frame 15 away from the fastener, compressing the second spring 20. This continues until the half-gear 17 rotates to the toothless side, approaching the rack 18. At this point, the rack 18 loses its meshing force with the half-gear 17, causing the sliding frame 15 to spring towards the fastener via the second spring 20. This, in turn, moves the impact rod 22 and the impact head 24 towards the fastener, allowing the impact head 24 to impact it. This process more closely resembles real-world testing, preventing significant discrepancies between the test results and actual conditions.

[0043] A support and movement mechanism is also installed on the side of the testing platform 1 near the mounting platform 13. The support and movement mechanism is used to support the mounting platform 13 and control the movement of the mounting platform 13.

[0044] See attached document Figure 4 The support and movement mechanism includes two fixed plates 26 fixed on the side of the detection platform 1 near the mounting platform 13, and a threaded rod 27 is rotatably connected between the two fixed plates 26. At least one guide rod 30 is fixed between the two fixed plates 26. A moving block 28 is fixed at the bottom of the mounting platform 13, and the moving block 28 is threadedly connected to the threaded rod 27. The moving block 28 is slidably connected to the guide rod 30. A second motor 29 is installed on the side of one of the fixed plates 26 away from the other fixed plate 26. The output end of the second motor 29 is connected to the threaded rod 27.

[0045] When the impact head 24 impacts the fastener, it can drive the second motor 29, so that the output end of the second motor 29 drives the threaded rod 27 to rotate. Through the threaded connection between the threaded rod 27 and the moving block 28, and through the sliding connection between the moving block 28 and the guide rod 30, the moving block 28 can slide left and right on the guide rod 30, thereby driving the mounting table 13 and the impact head 24 to slide left and right, so as to adjust the position of the impact head 24 impacting the fastener.

[0046] An installation chamber 23 is fixed to the end of the impact rod 22 away from the sliding frame 15. An installation block 25 is fixed to the end of the impact head 24 near the impact rod 22. The installation block 25 is inserted into the installation chamber 23. A first magnet is provided on the outside of the installation block 25. A second magnet is provided on the inside of the installation chamber 23 to attract the first magnet. With this arrangement, impact heads 24 of different shapes can be replaced to impact the fasteners, and the actual situation can be reproduced as much as possible. After the installation block 25 is inserted into the inside of the installation chamber 23, the impact head 24 can be firmly installed in the installation chamber 23 by the setting of the first magnet and the second magnet.

[0047] A limiting rod 10 is fixed at the top of the fixed column 7 and inside the annular electromagnet 8. A limiting groove 11 corresponding to the limiting rod 10 is provided at the bottom of the adsorbed iron block 9. By setting the limiting groove 11, the annular electromagnet 8 can be activated when the device performs a tensile impact test on the fastener, so that the annular electromagnet 8 adsorbs the adsorbed iron block 9, thereby allowing the limiting rod 10 to slide into the limiting groove 11. This ensures that the testing platform 1 and the base plate 5 are in a relatively stable state during the impact test, and the testing platform 1 will not tilt due to the impact force, thus limiting the impact effect. The limiting rod 10 is provided with a round head 12 at the top, which makes it easier for the limiting rod 10 to slide into the limiting groove 11.

[0048] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A tensile strength testing device for aerospace fasteners, comprising a testing platform (1), characterized in that: The detection platform (1) has mounting plates (2) fixed at both ends of its top. Hydraulic cylinders (3) are fixed on the side of the two mounting plates (2) that are close to each other. Clamps (4) are fixed on the output ends of the two hydraulic cylinders (3) that are close to each other. The bottom of the testing platform (1) is equipped with a vibration structure, which is used to control the vibration of the testing platform (1). An impact structure is installed on one side of the testing platform (1), which is used to test the impact resistance of fasteners.

2. The tensile strength testing device for aerospace fasteners according to claim 1, characterized in that: The vibration mechanism structure includes a base plate (5) fixed to the lower part of the detection platform (1). A first spring (6) is fixed at each of the four corners of the top of the base plate (5). A fixing column (7) is fixed at the top of the base plate (5) and inside the first spring (6). A ring electromagnet (8) is fixed at the top of the fixing column (7). Adsorption iron blocks (9) with the same number and position as the first spring (6) are fixed at the bottom of the detection platform (1). The first spring (6) is fixedly connected to the adsorption iron blocks (9).

3. The tensile strength testing device for aerospace fasteners according to claim 2, characterized in that: The impact structure includes a mounting platform (13) disposed on one side of the detection platform (1). A support and moving mechanism is also installed on the side of the detection platform (1) near the mounting platform (13). The support and moving mechanism is used to support the mounting platform (13) and control the movement of the mounting platform (13). A fixing frame (14) is fixed on the top of the mounting platform (13), and a sliding frame (15) is slidably connected to the top of the fixing frame (14). A rack (18) is fixed on one side of the sliding frame (15). A first motor (16) is also fixed on the top of the mounting platform (13). A half gear (17) is fixed vertically upward at the output end of the first motor (16), and the half gear (17) meshes with the rack (18). The sliding frame (15) has a lower fixing plate (19) fixed at the bottom of one end near the detection platform (1), and a second spring (20) is installed between the lower fixing plate (19) and the fixing frame (14); An impact rod (22) is fixed at one end of the sliding frame (15) near the detection platform (1), and an impact head (24) is installed at the end of the impact rod (22) away from the sliding frame (15).

4. The tensile strength testing device for aerospace fasteners according to claim 3, characterized in that: The lower fixing piece (19) is fixed to a limiting strip (21) on the side close to the fixing frame (14) and inside the second spring (20), and the limiting strip (21) is slidably connected to the fixing frame (14).

5. The tensile strength testing device for aerospace fasteners according to claim 3, characterized in that: The support and moving mechanism includes two fixed plates (26) fixed on the side of the detection platform (1) near the mounting platform (13), and a threaded rod (27) is rotatably connected between the two fixed plates (26). At least one guide rod (30) is fixed between the two fixed plates (26). A moving block (28) is fixed at the bottom of the mounting platform (13), and the moving block (28) is threadedly connected to the threaded rod (27). The moving block (28) is slidably connected to the guide rod (30). A second motor (29) is installed on the side of one of the fixed plates (26) away from the other fixed plate (26), and the output end of the second motor (29) is connected to the threaded rod (27).

6. The tensile strength testing device for aerospace fasteners according to claim 3, characterized in that: The impact rod (22) is fixed with a mounting chamber (23) at one end away from the sliding frame (15). The impact head (24) is fixed with a mounting block (25) at one end near the impact rod (22). The mounting block (25) is inserted into the mounting chamber (23). A first magnet is provided on the outside of the mounting block (25). A second magnet that attracts the first magnet is provided on the inside of the mounting chamber (23).

7. The tensile strength testing device for aerospace fasteners according to claim 3, characterized in that: A limiting rod (10) is fixed at the top of the fixed column (7) and inside the annular electromagnet (8), and a limiting groove (11) corresponding to the limiting rod (10) is provided at the bottom of the adsorption iron block (9).

8. The tensile strength testing device for aerospace fasteners according to claim 7, characterized in that: The top of the limiting rod (10) is provided with a round head (12).

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