Fatigue test device and method for hardware fitting

Abstract

The invention provides a fitting fatigue experiment device and method, and belongs to the technical field of electric power fitting experiments, and the fitting fatigue experiment device comprises a frame body, a cable and an excitation assembly; two clamping assemblies are arranged on the frame body in parallel, and each clamping assembly is used for fixing a fitting; the mooring rope is of an end-to-end annular structure and is made of a deformable material. Two parts of the cable are respectively connected with the two fittings fixed on the two clamping assemblies to form a to-be-tested rope body between the two fittings; the excitation assembly is used for applying an acting force to the to-be-tested rope body, so that the to-be-tested rope body transmits the acting force to the hardware fitting. The invention further provides a hardware fitting fatigue test method based on the hardware fitting fatigue test device. According to the hardware fitting fatigue experiment device and method, the dynamic load borne by the hardware fitting in practical application can be stably simulated, and the fatigue life and the structural reliability of the hardware fitting can be accurately evaluated.

Description

Technical Field

[0001] This invention belongs to the field of electrical component testing technology, and more specifically, relates to a hardware fatigue testing device and method. Background Technology

[0002] Fittings are widely used connection and fastening components in the construction of infrastructure such as power, communications, and transportation. They are mainly used to fix, connect, and protect cables, insulators, and other electrical equipment, and are key components to ensure the stability of line structures and the safety of power transmission. Fittings need to withstand dynamic stresses such as the weight of cables, wind loads, and temperature changes over long periods of time, therefore, they have extremely high requirements for mechanical strength and fatigue resistance.

[0003] Currently, to ensure the safety of fittings during long-term service, fatigue strength tests are conducted through random sampling to simulate the stress state under actual working conditions. Existing fatigue testing methods typically connect the fittings to the cable and apply periodic vibration force to the cable using a vibration device, subjecting the fittings to repeated bending or tensile loads to assess their fatigue life.

[0004] The inventors discovered that during the experiment, the cable itself undergoes elastic deformation due to vibration in the existing testing equipment. This deformation of the cable itself can cause the clamping failure of the fittings. This interference makes the test results unable to accurately reflect the fatigue characteristics of the fittings themselves, which may mask the potential defects of the fittings or overestimate their ultimate fatigue strength, thus causing deviations in the judgment of the safety performance of the fittings and making it difficult to meet the accuracy requirements of fatigue testing. Summary of the Invention

[0005] The purpose of this application is to provide a hardware fatigue testing apparatus and method to solve the problem that in existing hardware fatigue testing methods, when the hardware is connected to the cable and a periodic vibration force is applied to the cable through a vibration device, the cable will undergo elastic deformation due to vibration, leading to hardware clamping failure. This interference makes the test results unable to accurately reflect the fatigue characteristics of the hardware itself, which may mask potential defects or overestimate the ultimate fatigue strength, affect the judgment of the hardware's safety performance, and make it difficult to meet the testing accuracy requirements.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: A hardware fatigue testing apparatus is provided, comprising: A frame; two clamping assemblies are arranged side by side on the frame, each of the clamping assemblies being used to fix the hardware; The cable, employing a loop structure with its ends joined together, is made of a deformable material; two portions of the cable are respectively connected to two fittings fixed to the two clamping assemblies to form a test rope body located between the two fittings; and An excitation component is used to apply a force to the rope under test so that the rope under test transmits the force to the fitting.

[0007] In one possible implementation, the excitation component includes: A mounting base is disposed between the two clamping components; A rotating disk is rotatably mounted on the mounting base and is driven by a rotation drive component; the rotating disk has a through cavity, the axis of which is parallel to the rotation axis of the rotating disk, and the cable passes through the through cavity; and A connecting sleeve is disposed within the cavity, and the inner circumferential surface of the connecting sleeve is in contact with the outer circumferential surface of the cable; the connecting sleeve is connected to a linear adjustment component, which is used to drive the connecting sleeve to reciprocate in a direction perpendicular to the axial direction of the cavity.

[0008] In one possible implementation, the rotation drive component includes: An external gear ring is fitted around the outer periphery of the rotating disk; and Multiple planetary gears are spaced around the rotating disk and all mesh with the external gear ring; each planetary gear is rotatably connected to the mounting base, and one of the planetary gears is driven by a drive motor.

[0009] In one possible implementation, the excitation component further includes: Two baffles are arranged side by side on the mounting base, and the two baffles are respectively located on both sides of the rotating disk; one end of each baffle is connected to the mounting base, and the other end abuts against the rotating disk to prevent the rotating disk from detaching from the mounting base.

[0010] In one possible implementation, the linear adjustment component includes: The fixed section, having a hollow internal structure, is disposed within the through cavity, with one end connected to the inner wall of the through cavity; and The expansion joint has one end slidably inserted into the fixed joint, and the other end connected to the connecting sleeve; The expansion joint has a strip-shaped hole, and the length direction of the strip-shaped hole is parallel to the sliding direction of the expansion joint; the fixed joint has a fixing bolt pair, and the fixing bolt pair is slidably connected to the strip-shaped hole.

[0011] In one possible implementation, the clamping component includes: Two side-by-side clamps are slidably connected to the frame. The two clamping plates are connected by a linear drive mechanism to move the two clamping plates toward each other or away from each other for clamping or releasing the fittings.

[0012] In one possible implementation, the linear drive mechanism includes: Two threaded sleeves are respectively disposed on the two clamping plates, and the axial direction of the threaded sleeves is parallel to the sliding direction of the clamping plates; and A double-ended screw is rotatably connected to the frame; the double-ended screw has two external threads with opposite thread directions, and the two external threads are respectively threaded to two threaded sleeves; the double-ended screw is driven by a rotary motor to rotate the double-ended screw. When the double-ended screw rotates, the two threaded sleeves are adapted to drive the two clamping plates to move towards or away from each other.

[0013] In one possible implementation, the fitting fatigue testing apparatus further includes: Multiple guide wheels are spaced apart around the frame, each guide wheel being rotatably connected to the frame and adapted to connect with the cable; and A tensioning mechanism is provided on the frame and located between two adjacent guide wheels therein, for connecting with the cable to apply a force to the cable to tighten it against the guide wheels.

[0014] In one possible implementation, the tensioning mechanism includes: The movable seat is slidably connected to the frame; and A linear cylinder is mounted on the frame, and the power output end of the linear cylinder is connected to the movable seat to drive the movable seat to move toward or away from the cable. The guide wheel is rotatably mounted on the movable seat; when the linear cylinder drives the movable seat to move toward the cable, the guide wheel is adapted to engage with the cable.

[0015] In this embodiment, two hardware components to be tested are respectively installed and fixed in two clamping assemblies on the frame to ensure stable clamping and prevent loosening during the experiment. Two parts of a deformable cable with a ring structure are connected to the two hardware components respectively, forming a "test rope" segment between the two hardware components, thus creating a closed-loop force distribution. Periodic forces are applied to the "test rope" segment by an excitation assembly to simulate the dynamic stress environment in actual working conditions. Under the excitation, the test rope deforms and transmits the force to the hardware components at both ends, subjecting them to repeated mechanical loads, thereby achieving fatigue testing of the hardware components.

[0016] The hardware fatigue testing apparatus provided in this application, compared with the prior art, uses a ring-shaped deformable cable instead of a traditional cable, avoiding the influence of elastic deformation of the cable caused by vibration during the test on the clamping stability of the hardware. The ring structure concentrates the deformation of the cable in the "test cable" segment, making the connection point between the hardware and the clamping component more stable and reducing the risk of clamping failure. The excitation component acts directly on the test segment of the cable, making the force transmission path clearer and accurately simulating the dynamic stress that the hardware bears under actual working conditions. This avoids force transmission loss or deviation caused by cable deformation, ensuring that the test results can truly reflect the fatigue strength and life of the hardware itself. Through fixed hardware clamping, closed-loop cable design, and controllable excitation, experimental variables (such as cable deformation and clamping stability) are effectively controlled, reducing the deviation in judging the safety performance of the hardware, meeting the requirements of high-precision fatigue testing, and helping to more accurately identify potential defects in the hardware or assess the ultimate fatigue strength.

[0017] The technical solution adopted in this application also provides a method for testing hardware fatigue, and a hardware fatigue testing apparatus based on any of the foregoing contents, comprising the following steps: A. Adjust the two clamping components to fit the size of the fittings; fix the two fittings to be tested onto the two clamping components respectively, ensuring that the fittings are securely installed; B. Connect the two parts of the cable to the two hardware fittings respectively to form the rope body to be tested; C. Activate the excitation component to apply a force to the rope under test and preset the application time or number of times; D. After a preset time or number of times, unlock the two fittings; control the cable to move horizontally, forming another section of the rope to be tested; E. Monitor and record stress changes and fatigue damage in fittings and cables; F. Repeat steps C through E until the desired total duration or number of repetitions is achieved.

[0018] The beneficial effects of the hardware fatigue testing method provided in this embodiment are the same as those of the aforementioned hardware fatigue testing apparatus, and will not be repeated here. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A three-dimensional structural diagram of the hardware fatigue testing apparatus provided in an embodiment of the present invention. Figure 1; Figure 2 A three-dimensional structural diagram of the hardware fatigue testing apparatus provided in an embodiment of the present invention. Figure 2 ; Figure 3 This is a front view schematic diagram of the hardware fatigue testing device provided in an embodiment of the present invention; Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure along line AA; The following are the labeling elements in the figure: 1. Frame; 2. Clamping plate; 3. Cable; 4. Excitation component; 41. Mounting base; 42. Rotating disk; 43. Connecting sleeve; 44. Baffle; 5. Rotation drive component; 51. External gear ring; 52. Planetary gear; 53. Drive motor; 6. Linear adjustment component; 61. Fixed section; 62. Expansion joint; 63. Strip hole; 64. Fixing bolt pair; 7. Linear drive mechanism; 71. Threaded sleeve; 72. Double-ended screw; 73. Rotation motor; 8. Guide wheel; 9. Tensioning mechanism; 91. Moving base; 92. Linear cylinder; a1. Fittings. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Please refer to the following: Figures 1 to 4 The hardware fatigue testing apparatus and method provided in this application are now described. The hardware fatigue testing apparatus includes a frame 1, a cable 3, and an excitation component 4.

[0026] Two clamping assemblies are arranged side by side on the frame 1, each used to fix the hardware a1. The clamping assemblies can be equipped with an angle adjustment function to simulate the tilted force state of hardware a1 during actual installation.

[0027] The cable 3 adopts a loop structure with its ends connected and is made of a deformable material. Two parts of the cable 3 are respectively connected to two fittings a1 fixed to two clamping assemblies to form the test cable between the two fittings a1. The loop cable 3 structure enables cyclic loading, simplifying the complexity of the experimental setup. The deformable cable 3 material can realistically simulate the dynamic stress under actual working conditions, improving the accuracy of fatigue testing.

[0028] Excitation component 4 is used to apply force to the rope under test so that the rope under test transmits the force to fitting a1.

[0029] In this embodiment, two fittings a1 to be tested are respectively installed and fixed in two clamping assemblies on the frame 1 to ensure stable clamping of fittings a1 and prevent loosening during the experiment. Two parts of a deformable cable 3 with a ring structure are connected to the two fittings a1 respectively, forming a "test rope" segment between the two fittings a1, thus creating a closed-loop force distribution. Periodic forces are applied to the "test rope" by the excitation assembly 4 to simulate the dynamic stress environment in actual working conditions. The test rope deforms under the excitation and transmits the force to the fittings a1 at both ends, subjecting fittings a1 to repeated mechanical loads, thereby achieving fatigue testing of fittings a1.

[0030] The hardware fatigue testing apparatus provided in this application, compared with the prior art, uses a ring-shaped deformable cable 3 instead of a traditional cable, avoiding the influence of elastic deformation of the cable caused by vibration on the clamping stability of hardware a1 during the test. The ring structure concentrates the deformation of the cable 3 in the "test rope" segment, making the connection point between hardware a1 and the clamping component more stable and reducing the risk of clamping failure. The excitation component 4 acts directly on the test segment of the cable 3, making the force transmission path clearer and accurately simulating the dynamic stress borne by hardware a1 under actual working conditions. This avoids force transmission loss or deviation caused by cable deformation, ensuring that the test results can truly reflect the fatigue strength and life of hardware a1 itself. Through the fixed clamping of hardware a1, the closed-loop cable 3 design, and the controllable excitation effect, experimental variables (such as cable 3 deformation and clamping stability) are effectively controlled, reducing the deviation in judging the safety performance of hardware a1, meeting the requirements of high-precision fatigue testing, and helping to more accurately identify potential defects of hardware a1 or assess its ultimate fatigue strength.

[0031] In some embodiments, the excitation component 4 described above may employ, for example... Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The excitation component 4 includes a mounting base 41, a rotating disk 42, and a connecting sleeve 43.

[0032] Mounting base 41 is disposed between the two clamping components.

[0033] The rotating disk 42 is rotatably mounted on the mounting base 41 and is connected to the rotating drive component 5; the rotating disk 42 has a through cavity, the axis of which is parallel to the rotation axis of the rotating disk 42, and the cable 3 passes through the through cavity.

[0034] The connecting sleeve 43 is disposed in the cavity, and the inner circumferential surface of the connecting sleeve 43 is in contact with the outer circumferential surface of the cable 3; the connecting sleeve 43 is connected to a linear adjustment component 6, which is used to drive the connecting sleeve 43 to reciprocate in a direction perpendicular to the axial direction of the cavity.

[0035] A mounting base 41 with a rotating disk 42 is installed between two clamping components, and the cable 3 passes through the cavity of the rotating disk 42. The rotating disk 42 is rotated by the rotation drive component 5, and the connecting sleeve 43 is driven to reciprocate within the cavity by the linear adjustment component 6. The connecting sleeve 43 contacts the cable 3, and a dynamic excitation force is applied to the rope to be tested through the combined action of rotation and linear motion.

[0036] By adopting the above technical solution, the rotating disk 42 and the linear adjustment component 6 are combined to achieve multi-dimensional excitation (rotation + reciprocating movement), which is closer to the actual force scenario of the fitting a1; the through cavity structure guides the cable 3, preventing the cable 3 from deviating or wearing during the excitation process; the excitation frequency and amplitude can be adjusted independently, improving the controllability of experimental parameters.

[0037] The linear adjustment component 6 can be replaced with a ball screw driven by a servo motor to achieve higher precision displacement control; a pressure sensor can be added inside the cavity to monitor the contact force between the cable 3 and the connecting sleeve 43 in real time.

[0038] In some embodiments, the rotation drive member 5 may be as follows: Figure 4 The structure shown is described in the following document. Figure 4 The rotation drive component 5 includes an external gear ring 51 and multiple planetary gears 52.

[0039] The external gear ring 51 is placed on the outer periphery of the rotating disk 42.

[0040] Multiple planetary gears 52 are spaced around the rotating disk 42 and all mesh with the external gear ring 51; each planetary gear 52 is rotatably connected to the mounting base 41, and one of the planetary gears 52 is driven by a drive motor 53.

[0041] An external gear ring 51 is fitted around the outer periphery of the rotating disk 42, and multiple planetary gears 52 are arranged around the external gear ring 51 and connected to the mounting base 41; when the drive motor 53 drives one of the planetary gears 52 to rotate, it can drive the external gear ring 51 and the rotating disk 42 to rotate through gear meshing.

[0042] By adopting the above technical solutions, the planetary gear 52 transmission has high torque and low noise characteristics, which is suitable for the stability requirements of long-term fatigue tests; the multi-gear meshing disperses the load, reduces the wear of individual gears, and extends the service life of the device; the speed can be adjusted by replacing gears with different numbers of teeth to adapt to different frequency excitation requirements.

[0043] In some embodiments, the excitation component 4 described above may employ, for example... Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The excitation component 4 also includes two baffles 44.

[0044] Two baffles 44 are arranged side by side on the mounting base 41, and the two baffles 44 are located on both sides of the rotating disk 42 respectively; one end of each baffle 44 is connected to the mounting base 41, and the other end abuts against the rotating disk 42 to prevent the rotating disk 42 from detaching from the mounting base 41.

[0045] By adopting the above technical solution, the two baffles 44 prevent the rotating disk 42 from detaching from the mounting base 41 due to centrifugal force or vibration when rotating at high speed, thus improving experimental safety; the sliding contact structure between the baffles 44 and the rotating disk 42 does not affect the degree of freedom of rotation, ensuring excitation accuracy; and the limit design is simplified, reducing the maintenance cost of the device.

[0046] A rolling bearing can be installed at the contact point between the baffle 44 and the rotating disk 42 to reduce friction loss; the baffle 44 can be made of an elastic material (such as spring steel) to provide a buffering effect during severe vibration.

[0047] In some embodiments, the linear adjustment member 6 described above may be as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The linear adjustment component 6 includes a fixed section 61 and an expansion joint 62.

[0048] The fixed section 61 has an internally hollow structure, is set inside the cavity, and one end of it is connected to the inner wall of the cavity.

[0049] One end of the expansion joint 62 is slidably inserted into the fixed joint 61, and the other end of the expansion joint 62 is connected to the connecting sleeve 43.

[0050] The expansion joint 62 has a strip-shaped hole 63, and the length direction of the strip-shaped hole 63 is parallel to the sliding direction of the expansion joint 62; the fixed joint 61 has a fixing bolt pair 64, and the fixing bolt pair 64 is slidably connected to the strip-shaped hole 63.

[0051] The fixed section 61 is fixed to the inner wall of the cavity, and the telescopic section 62 is slidably inserted into the fixed section 61 and connected to the connecting sleeve 43; by cooperating with the strip hole 63 and the fixing bolt pair 64, the extension length of the telescopic section 62 is adjusted, thereby changing the position of the connecting sleeve 43; after the bolt pair is locked, the position of the telescopic section 62 is fixed, so as to achieve precise control of the excitation force application point.

[0052] By adopting the above technical solutions, the cooperation between the strip hole 63 and the bolt pair can achieve stepless adjustment, improving the flexibility of the excitation position; the hollow fixed section 61 and the telescopic section 62 have a lightweight structure, reducing the inertial load on the rotating disk 42; the mechanical locking method is stable and reliable, avoiding the drift of the connecting sleeve 43 during the experiment.

[0053] The expansion joint 62 can be equipped with a built-in displacement sensor to provide real-time feedback on the adjustment distance; alternatively, an electromagnetic lock can be used to replace the bolt pair to achieve automated remote adjustment.

[0054] In some embodiments, the clamping assembly described above may employ, for example... Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The clamping assembly includes two clamping plates 2.

[0055] The two side-by-side clamps 2 are slidably connected to the frame 1.

[0056] The two clamping plates 2 are connected to a linear drive mechanism 7 so that the two clamping plates 2 can move towards or away from each other to clamp or release the fitting a1.

[0057] Two clamping plates 2 are slidably connected to the frame 1, and the clamping plates 2 are driven to move in opposite directions / backwards by the linear drive mechanism 7; after the fitting a1 is placed, the clamping plates 2 are controlled to clamp and fix it; after the experiment is completed, the clamping plates 2 are driven to loosen and the fitting a1 is removed.

[0058] By adopting the above technical solutions, the sliding clamp 2 can adapt to the clamping requirements of different sized fittings a1, enhancing the versatility of the device; the symmetrical clamping design ensures that the force center of fitting a1 is aligned with the axis of cable 3, reducing test errors; the linear drive mechanism 7 can provide stable clamping force, preventing fitting a1 from loosening during the experiment.

[0059] The contact surface of the clamping plate 2 can be equipped with replaceable rubber pads or toothed structures to improve the clamping stability of irregularly shaped fittings a1; a pressure sensor can be integrated into the clamping plate 2 to monitor the clamping force in real time and feed it back to the control system.

[0060] In some embodiments, the linear drive mechanism 7 described above may employ, for example... Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The linear drive mechanism 7 includes two threaded sleeves 71 and a double-ended screw 72.

[0061] Two threaded sleeves 71 are respectively installed on two clamping plates 2, and the axial direction of the threaded sleeves 71 is parallel to the sliding direction of the clamping plates 2.

[0062] The double-ended screw 72 is rotatably connected to the frame 1; the double-ended screw 72 has two external threaded portions with opposite thread directions, and the two external threaded portions are respectively threadedly connected to two threaded sleeves 71; the double-ended screw 72 is driven by a rotating motor 73 to make the double-ended screw 72 rotate.

[0063] When the double-ended screw 72 rotates, the two threaded sleeves 71 are adapted to drive the two clamping plates 2 to move towards or away from each other.

[0064] By adopting the above technical solution, the double-headed screw 72 transmission can realize the synchronous movement of the clamping plate 2, ensuring that the clamping center position remains unchanged; the thread transmission has a self-locking characteristic, avoiding the clamping force from being attenuated due to vibration; and the above structure is compact, occupies little space, and is easy to integrate into the frame 1.

[0065] In some embodiments, the above-mentioned hardware fatigue testing apparatus can be adopted as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The hardware fatigue testing device also includes multiple guide wheels 8 and a tensioning mechanism 9.

[0066] Multiple guide wheels 8 are spaced around the frame 1. Each guide wheel 8 is rotatably connected to the frame 1 and is adapted to connect with the cable 3, thereby guiding the direction of the loop cable 3.

[0067] The tensioning mechanism 9 is mounted on the frame 1 and is located between two adjacent guide wheels 8. It is used to connect with the cable 3 to apply a force to the cable 3 to tighten it against the guide wheels 8. By applying a tightening force to the cable 3 through the tensioning mechanism 9 (located between adjacent guide wheels 8), the tension of the cable 3 is ensured to be consistent.

[0068] By adopting the above technical solutions, the guide wheel 8 can reduce the friction between the cable 3 and the frame 1, thereby extending the service life of the cable 3; the tensioning mechanism 9 can ensure that the cable 3 is always in a preset tension state during the experiment, avoiding test errors caused by slack; the multi-guide wheel 8 layout can flexibly adjust the path of the cable 3 to adapt to different experimental scenarios.

[0069] The guide wheel 8 has a V-shaped groove on its surface to accommodate cables 3 of different diameters; the tensioning mechanism 9 can be equipped with a tension sensor to monitor the tension of the cable 3 in real time and adjust it automatically.

[0070] In some embodiments, the tensioning mechanism 9 described above can be as follows: Figures 1 to 4 The structure shown is described in the following document. Figures 1 to 4 The tensioning mechanism 9 includes a movable seat 91 and a linear cylinder 92.

[0071] The movable seat 91 is slidably connected to the frame 1.

[0072] Linear cylinder 92 is mounted on frame 1, and the power output end of linear cylinder 92 is connected to movable seat 91 to drive movable seat 91 to move toward or away from cable 3.

[0073] The guide wheel 8 is rotatably mounted on the movable seat 91; when the linear cylinder 92 drives the movable seat 91 to move toward the cable 3, the guide wheel 8 is adapted to connect with the cable 3.

[0074] The linear cylinder 92 drives the movable seat 91 to slide along the frame 1, causing the guide wheel 8 on the movable seat 91 to move closer to or away from the cable 3; after the guide wheel 8 contacts the cable 3, the pressure of the linear cylinder 92 maintains the tension of the cable 3.

[0075] By adopting the above technical solution, the linear cylinder 92 has a fast drive response speed, which can quickly achieve tensioning or slack of cable 3; the output force of the linear cylinder 92 is stable, which can avoid tension fluctuations caused by manual adjustment; the above structure is simple, has low maintenance cost, and is suitable for long-term high-frequency experiments.

[0076] The technical solution adopted in this application also provides a hardware fatigue testing method, which, based on any of the foregoing hardware fatigue testing apparatus, includes the following steps: A. Adjust the two clamping components to fit the size of fitting a1; fix the two fittings a1 to be tested onto the two clamping components respectively, ensuring that fitting a1 is securely installed.

[0077] B. Connect the two parts of the cable 3 to the two fittings a1 respectively to form the rope to be tested.

[0078] C. Activate excitation component 4 to apply force to the rope under test and preset the application time or number of times.

[0079] D. After the preset time or number of times is reached, unlock the two fittings a1; control the cable 3 to move in translation to form another section of the rope to be tested.

[0080] E. Monitor and record stress changes and fatigue damage of fitting a1 and cable 3.

[0081] F. Repeat steps C through E until the desired total duration or number of repetitions is achieved.

[0082] By adopting the above method and steps, in step B, a ring-shaped deformable cable 3 is used, which is connected to the hardware a1 only through the "rope body to be tested" segment, thus avoiding the overall deformation of the traditional whole cable when vibrating.

[0083] Step D involves replacing the section to be tested by translating the cable 3 to ensure that the cable 3 section is a "new area" for each test, thus avoiding the cumulative fatigue of the cable 3 itself from affecting the stress state of the fitting a1.

[0084] The operation of "adjusting the clamping components and ensuring secure installation" in step A, together with the rigid fixing structure of the clamping components in the device (such as the double-headed screw 72 driving the clamping plate 2), can effectively prevent the hardware a1 from loosening or shifting due to the deformation of the cable 3 during the test, thus solving the problem of "clamping failure".

[0085] In step C, the excitation component 4 applies a periodic force to the "rope under test". The force transmission path is clear (from cable 3 to fitting a1), avoiding force loss or directional deviation caused by cable deformation in traditional methods. This ensures that the load borne by fitting a1 is consistent with the actual working conditions, and the test results can accurately reflect its own fatigue strength.

[0086] Step E records stress changes and damage in real time. Combined with repeated testing in step F, the fatigue evolution process of fitting a1 under different load cycles can be captured, avoiding the obscuring of potential defects (such as microcrack propagation) or overestimation of ultimate strength due to deviations in a single test.

[0087] The modular operation of step AF (fixing, connecting, stimulating, replacing, monitoring, repeating) reduces human error and ensures experimental repeatability. The design of preset application time / number of times (step C) and cumulative test sum (step F) can simulate the dynamic stress environment of fitting a1 during long-term service, and the test data is more in line with the actual life assessment requirements. The closed-loop structure of the ring cable 3 allows for the reuse of different rope segments (step D), reducing consumable costs while further improving the accuracy of judging the safety performance of fitting a1 through cross-validation of results by multiple segments of testing.

[0088] This method, through a combination of "three-segment test of the ring cable + rigid clamping + precise excitation + dynamic monitoring", fundamentally eliminates the interference of traditional cable deformation on the test, ensuring that the fatigue characteristics of fitting a1 under controllable load are truly captured, and ultimately achieving a high-precision evaluation of the safety performance of fitting a1.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hardware fatigue testing apparatus, characterized in that, include: Frame; Two clamping assemblies are arranged side by side on the frame, and each clamping assembly is used to fix the hardware; The cable adopts a loop structure with the ends connected and is made of deformable material; two parts of the cable are respectively connected to two hardwares fixed on the two clamping assemblies to form a test rope body between the two hardwares. as well as An excitation component is used to apply a force to the rope under test so that the rope under test transmits the force to the fitting.

2. The hardware fatigue testing apparatus as described in claim 1, characterized in that, The excitation component includes: A mounting base is disposed between the two clamping components; A rotating disk is rotatably mounted on the mounting base and is driven by a rotation drive component; the rotating disk has a through cavity, the axis of which is parallel to the rotation axis of the rotating disk, and the cable passes through the through cavity; and A connecting sleeve is disposed within the cavity, and the inner circumferential surface of the connecting sleeve is in contact with the outer circumferential surface of the cable; the connecting sleeve is connected to a linear adjustment component, which is used to drive the connecting sleeve to reciprocate in a direction perpendicular to the axial direction of the cavity.

3. The hardware fatigue testing apparatus as described in claim 2, characterized in that, The rotation drive component includes: An external gear ring is fitted around the outer periphery of the rotating disk; and Multiple planetary gears are spaced around the rotating disk and all mesh with the external gear ring; each planetary gear is rotatably connected to the mounting base, and one of the planetary gears is driven by a drive motor.

4. The hardware fatigue testing apparatus as described in claim 2, characterized in that, The excitation component also includes: Two baffles are arranged side by side on the mounting base, and the two baffles are respectively located on both sides of the rotating disk; one end of each baffle is connected to the mounting base, and the other end abuts against the rotating disk to prevent the rotating disk from detaching from the mounting base.

5. The hardware fatigue testing apparatus as described in claim 2, characterized in that, The linear adjustment component includes: The fixed section, having a hollow internal structure, is disposed within the through cavity, with one end connected to the inner wall of the through cavity; and The expansion joint has one end slidably inserted into the fixed joint, and the other end connected to the connecting sleeve; The expansion joint has a strip-shaped hole, and the length direction of the strip-shaped hole is parallel to the sliding direction of the expansion joint; the fixed joint has a fixing bolt pair, and the fixing bolt pair is slidably connected to the strip-shaped hole.

6. The hardware fatigue testing apparatus as described in claim 1, characterized in that, The clamping assembly includes: Two side-by-side clamps are slidably connected to the frame. The two clamping plates are connected by a linear drive mechanism to move the two clamping plates toward each other or away from each other for clamping or releasing the fittings.

7. The hardware fatigue testing apparatus as described in claim 6, characterized in that, The linear drive mechanism includes: Two threaded sleeves are respectively disposed on the two clamping plates, and the axial direction of the threaded sleeves is parallel to the sliding direction of the clamping plates; and A double-ended screw is rotatably connected to the frame; the double-ended screw has two external threads with opposite thread directions, and the two external threads are respectively threaded to two threaded sleeves; the double-ended screw is driven by a rotating motor to rotate the double-ended screw. When the double-ended screw rotates, the two threaded sleeves are adapted to drive the two clamping plates to move towards or away from each other.

8. The hardware fatigue testing apparatus as described in claim 1, characterized in that, The hardware fatigue testing apparatus also includes: Multiple guide wheels are spaced apart around the frame, each guide wheel being rotatably connected to the frame and adapted to connect with the cable; and A tensioning mechanism is provided on the frame and located between two adjacent guide wheels therein, for connecting with the cable to apply a force to the cable to tighten it against the guide wheels.

9. The hardware fatigue testing apparatus as described in claim 8, characterized in that, The tensioning mechanism includes: The movable seat is slidably connected to the frame; and A linear cylinder is mounted on the frame, and the power output end of the linear cylinder is connected to the movable seat to drive the movable seat to move toward or away from the cable. The guide wheel is rotatably mounted on the movable seat; when the linear cylinder drives the movable seat to move toward the cable, the guide wheel is adapted to engage with the cable.

10. A method for testing hardware fatigue, based on the hardware fatigue testing apparatus according to any one of claims 1-9, characterized in that, Includes the following steps: A. Adjust the two clamping components to fit the size of the fittings; fix the two fittings to be tested onto the two clamping components respectively, ensuring that the fittings are securely installed; B. Connect the two parts of the cable to the two hardware fittings respectively to form the rope body to be tested; C. Activate the excitation component to apply a force to the rope under test and preset the application time or number of times; D. After a preset time or number of times, unlock the two fittings; control the cable to move horizontally, forming another section of the rope to be tested; E. Monitor and record stress changes and fatigue damage in fittings and cables; F. Repeat steps C through E until the desired total duration or number of repetitions is achieved.

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