A flexible fatigue and bending life detection device for a folding screen FPC connector

Abstract

The application belongs to the field of FPC connector detection, and particularly relates to a flexible fatigue and bending life detection device for an FPC connector for a foldable screen, which comprises a mounting plate and the like; a resistance tester is mounted on the top of the mounting plate, a power supply is mounted on the bottom of the mounting plate, a static terminal block is fixedly connected to the top of the side surface of the mounting plate, a dynamic terminal block is vertically and slidably connected to the bottom of the side surface of the mounting plate, and a terminal head is arranged on the opposite surface of the dynamic terminal block and the static terminal block. The upper and lower ends (or the front and rear ends) of the FPC connector body are simultaneously bent through the pair of docking shafts on the rotating plate, and the upper and lower ends (or the front and rear ends) of the FPC connector body are guided and limited by the upper and lower limiting shafts, so that the complex working conditions of the FPC connector in the actual use state of the foldable screen and the like, in which the two ends simultaneously bear the bending stress, can be truly simulated, and the detection result is closer to the actual service life.

Description

Technical Field

[0001] This invention relates to the field of FPC connector testing, and particularly to a device for testing the flexibility fatigue and bending life of FPC connectors for foldable screens. Background Technology

[0002] With the rapid development of consumer electronics, especially the widespread adoption of foldable phones, wearable devices, and precision medical electronic devices, flexible printed circuit boards (FPCs) and their connectors, as key internal interconnect components, have become core indicators for evaluating overall product quality in terms of reliability and durability. In real-world applications, FPCs and their connectors frequently withstand complex mechanical and thermal stresses caused by device opening and closing, bending, vibration, and temperature changes. For example, the FPC connectors in the hinge area of ​​foldable phones, the bending parts of smart bracelets, and movable wiring harnesses inside automobiles are constantly subjected to dynamic bending and fatigue stress. If an FPC connector experiences fatigue fracture, poor contact, or signal attenuation, it will directly lead to the failure of the entire end product. Therefore, accurate and efficient flexibility fatigue and bending life testing of FPC connectors is an indispensable and crucial step in product design verification, material selection, and quality control.

[0003] Currently, existing technologies for testing the bending or fatigue life of FPC connectors generally suffer from the following limitations: First, most testing equipment can only perform static or reciprocating single-point bending tests on a single end or middle area of ​​the FPC connector, failing to simulate the real-world conditions where both ends of the connector simultaneously bear complex stresses. This leads to significant deviations between the test results and the actual product lifespan. Second, the bending position is usually fixed during testing. This means that a single test can only evaluate the fatigue performance of a specific area of ​​the FPC connector. To evaluate the bending characteristics at other locations on the connector, the sample must be re-clamped and the equipment parameters adjusted. This testing mode is not only inefficient but also makes it difficult to continuously and systematically acquire fatigue life data at multiple key locations along the length of the connector under the same environmental conditions, potentially overlooking potential design or material defects.

[0004] Therefore, there is an urgent need to develop a device for testing the flexibility fatigue and bending life of FPC connectors for foldable screens in order to solve the above-mentioned technical problems. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a device for testing the flexible fatigue and bending life of FPC connectors for foldable screens.

[0006] The technical implementation of this invention is as follows: a device for testing the flexible fatigue and bending life of an FPC connector for foldable screens, comprising a mounting plate, a resistance tester, and a power supply. The resistance tester is mounted on the top of the mounting plate, and the power supply is mounted on the bottom of the mounting plate. A stationary terminal block is fixedly connected to the upper side of the mounting plate, and a movable terminal block is vertically slidably connected to the lower side of the mounting plate. Terminals are provided on the opposite surfaces of the movable and stationary terminal blocks. The resistance tester, power supply, and terminal blocks are connected by wiring. A fixed base is provided on the mounting plate below the movable terminal block. Guide optical axes are symmetrically arranged between the opposite surfaces of the fixed base and the stationary terminal block. The movable terminal block and the guide optical axes are vertically slidably connected. A movable plate is vertically slidably connected to the upper part of the guide optical axes. Multiple bending testing mechanisms are provided on the movable plate, and the bending radius of each bending testing mechanism can be changed.

[0007] Optionally, the bending test mechanism includes a row of rotating shafts rotatably mounted on a movable plate. Each rotating shaft has a rotating plate connected to its front end. Both ends of each rotating shaft are rotatably mounted with mating sleeves. Each mating sleeve can be detachably connected with a mating shaft. An upper limit shaft is rotatably mounted on the movable plate above the rotating plate, and a lower limit shaft is rotatably mounted on the movable plate above the rotating plate. The FPC connector body to be tested passes between the mating shafts and also between the upper and lower limit shafts.

[0008] Optionally, the docking sleeve includes rotating blocks rotatably mounted at both ends of the rotating plate. A hollow cylinder is fixed to the front end of the rotating block. The hollow cylinder has symmetrically opened arc-shaped locking holes. An insertion hole is opened on the hollow cylinder in front of the locking hole, and the insertion hole communicates with the adjacent locking hole.

[0009] Optionally, the docking shaft includes a mandrel with a connector at one end. The mandrel is inserted into a hollow cylinder through the connector. The connector has symmetrically arranged grooves along its radial direction. Each groove has a locking rod slidably connected to a locking rod. Each locking rod has a sliding rod concentrically connected to its outer end. The locking rod portion is outside the groove. A spring connects the locking rod and the groove. Each sliding rod has an outer limiting block concentrically connected to its outer end.

[0010] Optionally, the diameter of the slide bar is smaller than the diameter of the locking rod, the diameter of the slide bar is the same as the width of the insertion hole, the diameter of the locking rod is the same as the width of the locking hole, and the diameter of the outer limiting block is larger than the diameter of the locking rod.

[0011] Optionally, it also includes a test position changing mechanism installed on the side of the mounting plate. The test position changing mechanism includes a first motor fixed below the side of the mounting plate. A ball screw is connected to the output shaft of the first motor. A threaded seat is threadedly connected to the ball screw. The threaded seat is fixedly connected to the moving plate.

[0012] Optionally, it also includes a synchronous drive structure installed on the other side of the movable plate. The synchronous drive structure includes a second motor installed on the other side of the movable plate. A transmission shaft is connected to the output shaft of the second motor. Multiple worms are concentrically connected to the transmission shaft. The number of worms is the same as the number of rotating shafts. A worm wheel is concentrically provided at the rear end of each rotating shaft. The worm wheel meshes with its adjacent worm.

[0013] Optionally, it also includes information acquisition mechanisms installed on the left and right sides of the bending test mechanism. The information acquisition mechanism includes mounting optical shafts installed on the moving plates on the left and right sides of the bending test mechanism. Sliding sleeves are slidably arranged on the mounting optical shafts. The sliding sleeves can rotate on the mounting optical shafts. An information acquisition camera is fixedly connected to the side of the sliding sleeve closest to the bending test mechanism. A threaded sleeve is provided on the other side of the sliding sleeve. A clamping bolt is threadedly connected inside the threaded sleeve. The clamping bolt fixes the sliding sleeve and its components to the mounting optical shaft.

[0014] Optionally, it also includes a pull cord installed on the rear side of the FPC connector body to be tested, the pull cord passing between the mating shafts and also between the upper limit shaft and the lower limit shaft, the top end of the pull cord being connected to the stationary terminal block and the bottom end of the pull cord being connected to the moving terminal block.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention bends the upper and lower ends (or front and rear ends) of the FPC connector body simultaneously by a pair of mating shafts on the rotating plate. Combined with the guiding and limiting of the upper and lower limit shafts, it can realistically simulate the complex working condition of the FPC connector in products such as foldable screens being subjected to bending stress at both ends simultaneously under actual use. The test results are closer to the actual service life. The docking shaft is connected to the hollow cylinder through a quick-release snap-fit ​​structure (clamp, slide, spring, snap hole, etc.). The mandrel of different diameters can be replaced simply by pressing the outer limit block, thereby changing the bending radius. The small diameter mandrel simulates a harsh small radius bend, while the large diameter mandrel simulates a gentle large radius bend, which is convenient for targeted testing of FPC connectors with different design specifications. The synchronous drive structure consisting of a second motor, a transmission shaft, a worm gear, and a worm wheel can precisely control the rotation angle of the rotating shaft, thereby independently adjusting the bending angle. The independent control of the angle and radius allows the device to cover a variety of complex bending stress conditions, from small, gentle angles to large angles and small radii, making the testing more comprehensive. The test position changing mechanism, consisting of a ball screw, a first motor, and a threaded seat, can drive the moving plate to move vertically along the guide optical axis, thereby accurately positioning the bending test mechanism to different sections on the FPC connector body. Without disassembling the sample, bending fatigue tests can be performed on multiple key positions of the same FPC connector body in sequence, significantly improving testing efficiency and data comparability. Multiple independent bending test mechanisms are arranged side by side on the moving plate. Each mechanism corresponds to one FPC connector body. The synchronous drive structure (single motor driving the transmission shaft and multiple sets of worm gears) enables all rotating axes to rotate synchronously, ensuring that multiple samples are tested in parallel at the same bending radius, the same bending angle, and the same frequency. This greatly improves the efficiency of batch testing and facilitates statistical comparison and process stability evaluation. The overall design features a vertical layout with an L-shaped mounting plate. All functional modules are integrated into the moving plate and mounting plate, and components such as pull ropes, guide shafts, and ball screws are rationally arranged. The push-button quick-release structure of the docking shaft and the tightness adjustment method of the sliding sleeve are both simple to operate, and replacement and adjustment can be completed without professional tools, reducing the difficulty of equipment use and maintenance. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the present invention after removing the mounting plate, resistance tester, and power supply.

[0018] Figure 3 For the present invention Figure 2 A schematic diagram of the three-dimensional structure from another perspective.

[0019] Figure 4 This is a three-dimensional structural diagram of the test position changing mechanism of the present invention.

[0020] Figure 5 This is a three-dimensional structural diagram of the components on the movable plate of the present invention.

[0021] Figure 6 This is a three-dimensional structural diagram of the bending test mechanism of the present invention.

[0022] Figure 7 This is a three-dimensional structural diagram of the mating sleeve and mating shaft of the present invention.

[0023] Figure 8 This is a three-dimensional structural diagram of the synchronous drive structure of the present invention.

[0024] Figure 9 This is a three-dimensional structural diagram of the information acquisition camera of the present invention.

[0025] The components in the attached diagram are labeled as follows: 1. Mounting plate; 1a. Fixed base; 2. Resistance tester; 3. Power supply; 4. Static terminal block; 5. Moving terminal block; 6. Terminal head; 7. Guide shaft; 8. Test position changing mechanism; 81. Ball screw; 82. First motor; 83. Threaded seat; 9. Moving plate; 10. Bending test mechanism; 101. Rotating shaft; 102. Rotating plate; 103. Connecting sleeve; 1031. Rotating block; 1032. Hollow cylinder; 1033. Locking hole; 1034. Insertion hole; 104. Connecting shaft; 105. 1. Spindle; 1042. Connector; 1043. Slide groove; 1044. Locking rod; 1045. Slide rod; 1046. Spring; 1047. Outer limit block; 105. Upper limit shaft; 106. Lower limit shaft; 11. Synchronous drive structure; 111. Second motor; 112. Transmission shaft; 113. Worm gear; 114. Worm wheel; 12. Information acquisition mechanism; 121. Mounting optical axis; 122. Sliding sleeve; 123. Information acquisition camera; 124. Threaded sleeve; 125. Clamping bolt; 13. Pull rope; A. FPC connector body. Detailed Implementation

[0026] Although the invention may be described with respect to specific applications or industries, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0027] Example: A device for testing the flexible fatigue and bending life of FPC connectors for foldable screens, such as... Figures 1-7As shown, the system includes a mounting plate 1, a resistance tester 2, and a power supply 3. The mounting plate 1 is L-shaped and vertically mounted, with its horizontal portion at the top. The resistance tester 2 is mounted on the top of the mounting plate 1, and the power supply 3 is mounted on the bottom of the mounting plate 1. A stationary terminal block 4, extending horizontally to the left and right, is fixedly attached to the upper front side of the mounting plate 1. A movable terminal block 5, extending horizontally to the left and right, is vertically slidably connected to the lower side of the mounting plate 1. Terminals 6 are provided on the opposite sides of the movable terminal block 5 and the stationary terminal block 4. The FPC connector body A to be tested is inserted between the terminal blocks 6 on the upper and lower sides. The resistance tester 2, the power supply 3, and the terminal blocks 6 are connected by wiring. During the testing of the connector body A, the lifespan of the FPC is evaluated by observing the change in resistance. A fixed seat 1a is horizontally extended on the mounting plate 1 below the moving connector 5. A vertical guide optical axis 7 is symmetrically arranged between the fixed seat 1a and the opposite surface of the stationary connector 4. The moving connector 5 and the guide optical axis 7 are vertically slidably connected. A vertically extended movable plate 9 is vertically slidably connected on the upper part of the guide optical axis 7. Multiple bending test mechanisms 10 are arranged on the movable plate 9. The bending test mechanism 10 can bend the FPC connector body A under test at two points, and the bending radius of the bending test mechanism 10 can be changed.

[0028] First, the two ends of the FPC connector body A to be tested are inserted into the terminals 6 on the opposite surfaces of the stationary terminal block 4 and the movable terminal block 5, respectively. The stationary terminal block 4 is fixed above the front side of the mounting plate 1, while the movable terminal block 5 can slide vertically along the guide optical axis 7 to accommodate FPC connector bodies A of different lengths and achieve reliable clamping. Then, the power supply 3 and resistance tester 2 are connected via a circuit to supply power to the FPC connector body A and monitor its resistance value in real time. During testing, the movable plate 9 can slide vertically along the guide optical axis 7, moving the multiple bending test mechanisms 10 mounted on it to different test positions on the FPC connector body A. Each bending test mechanism 10 can simultaneously bend the FPC connector body A at both the top and bottom, and the bending radius of the bending test mechanism 10 can be changed as needed to simulate bending stress under different curvatures. During repeated bending, the resistance tester 2 continuously records the changes in resistance value. When fatigue damage, microcracks, or fractures occur inside the FPC connector body A, its resistance will change abruptly or exceed a set threshold. Based on this, the flexible fatigue life and bending durability performance of the FPC connector can be evaluated. By sliding the moving plate 9, bending tests can be performed on multiple different positions of the FPC connector body A in the same test process without re-clamping, significantly improving the testing efficiency and the comprehensiveness of the results.

[0029] like Figures 5-7As shown, the bending test mechanism 10 includes a rotating shaft 101, a rotating plate 102, a docking sleeve 103, a docking shaft 104, an upper limit shaft 105, and a lower limit shaft 106. A row of rotating shafts 101 are rotatably mounted on the moving plate 9, extending left and right. The rotating shafts 101 pass through the moving plate 9, and the front end of each rotating shaft 101 is connected to a rotating plate 102. The rear center of the rotating plate 102 is fixedly connected to the front end of the rotating shaft 101. A docking sleeve 103 is rotatably mounted on both the left and right ends of the rotating shaft 101, and a docking shaft 104 can be detachably connected to each docking sleeve 103. 4. By changing the mating shafts 104 of different diameters, the bending radius of the FPC connector body A can be changed. An upper limit shaft 105 is rotatably set on the moving plate 9 above the rotating plate 102, and a lower limit shaft 106 is rotatably set on the moving plate 9 above the rotating plate 102. The FPC connector body A to be tested passes through the mating shafts 104, and also passes through the upper limit shaft 105 and the lower limit shaft 106. The upper limit shaft 105 is on the right side of the FPC connector body A, and the lower limit shaft 106 is on the FPC connector body A.

[0030] Each bending test mechanism 10 independently corresponds to one FPC connector body A to be tested. During testing, multiple FPC connector bodies A are passed through the mating shafts 104 on each rotating plate 102 and between the corresponding upper limit shaft 105 and lower limit shaft 106, without interference. All rotating shafts 101 are mounted side-by-side on the moving plate 9. When the rotating shafts 101 rotate, the rotating plate 102 at the front end of each rotating shaft 101 swings synchronously, causing the mating shafts 104 on the rotating plate 102 (paired at the left and right ends of the rotating shaft 101) to apply a periodic bending action to the passing FPC connector bodies A, bending them at both the top and bottom. The upper limit shaft 105 and lower limit shaft 106 are located on both sides of the FPC connector body A, serving as guides and limiters to ensure a stable bending path.

[0031] By controlling the rotation angle of the rotating shaft 101, the swing amplitude of the mating shaft 104 can be changed, thereby precisely adjusting the bending angle: the larger the rotation angle, the larger the bending angle, and the more severely the FPC connector body A is bent, simulating a larger angle of folding or bending; the smaller the rotation angle, the smaller the bending angle, simulating a small bending scenario. Simultaneously, by replacing the mating shaft 104 with different diameters, the bending radius can be changed: the smaller the diameter of the mating shaft 104, the smaller the bending radius, and the greater the local bending stress, simulating a more stringent bending curvature; the larger the diameter of the mating shaft 104, the larger the bending radius, the gentler the bend, and the lower the stress. With independent control of the bending angle and bending radius, this device can flexibly simulate various composite bending stress conditions, from gentle small angles to large angles and small radii, more comprehensively evaluating the flexible fatigue life of the FPC connector. Multiple bending test mechanisms 10 can simultaneously and independently test multiple FPC connector bodies A, significantly improving testing efficiency and facilitating batch comparisons or parallel tests.

[0032] like Figure 7 As shown, the docking sleeve 103 includes a rotating block 1031 and a hollow cylinder 1032. The rotating block 1031 is rotatably mounted on both the left and right ends of the rotating plate 102. The hollow cylinder 1032 is fixedly connected to the front end of the rotating block 1031. The hollow cylinder 1032 has symmetrical arc-shaped locking holes 1033. The hollow cylinder 1032 in front of the locking hole 1033 has an insertion hole 1034. The insertion holes 1034 on both sides are on the same diameter of the hollow cylinder 1032. The insertion hole 1034 communicates with its adjacent locking hole 1033. The width of the insertion hole 1034 is smaller than the width of the locking hole 1033.

[0033] like Figure 7As shown, the docking shaft 104 includes a spindle 1041, a connector 1042, a locking rod 1044, a sliding rod 1045, a spring 1046, and an outer limiting block 1047. The rear end of the spindle 1041 is provided with a connector 1042. The spindle 1041 is inserted into the hollow cylinder 1032 through the connector 1042. The connector 1042 has symmetrically opened sliding grooves 1043 along its radial direction. Each of the sliding grooves 1043 is slidably connected with a locking rod. Rod 1044 and locking rod 1044 are both concentrically connected to sliding rods 1045 at their outer ends. Part of locking rod 1044 extends outside the sliding groove 1043. A spring 1046 connects locking rod 1044 and the sliding groove 1043. External limiting blocks 1047 are concentrically connected to the outer ends of sliding rods 1045. The diameter of sliding rod 1045 is smaller than the diameter of locking rod 1044, and the diameter of sliding rod 1045 is the same as the width of the insertion hole 1034. The diameter of 44 is the same as the width of the locking hole 1033. Because the width of the insertion hole 1034 is smaller than the width of the locking hole 1033, the connector 1042 cannot be inserted into the hollow cylinder 1032 when the locking rod 1044 has not entered the slide groove 1043. The diameter of the outer limit block 1047 is larger than the diameter of the locking rod 1044. By replacing the mandrel 1041 with a different diameter, the bending radius can be changed. When docking the mandrel 1041, press the outer limit blocks 1047 on both sides so that the locking rod 1044 enters the slide groove 1043. The slide rod 1045 enters the locking hole 1033 from the insertion hole 1034. Then release the outer limit block 1047. The spring 1046 drives the locking rod 1044 to move outward and reset. The locking rod 1044 partially moves out of the slide groove 1043 and is locked in the locking hole 1033. At this time, the mandrel 1041 cannot be pulled out to complete the docking.

[0034] When installing the docking shaft 104, first manually press the outer limit blocks 1047 on both sides to overcome the force of the spring 1046 and fully retract the locking rod 1044 into the slide groove 1043. At the same time, the slide rod 1045 moves inward. At this time, align the connector 1042 with the front end of the hollow cylinder 1032 and insert it. Since the diameter of the slide rod 1045 is the same as the width of the insertion hole 1034, the slide rod 1045 can smoothly pass through the insertion hole 1034 and enter the hollow cylinder 1032. Continue pushing until the slide rod 1045 reaches the locking hole 1033. Then release the outer limit blocks 1047. The restoring force of the spring 1046 pushes the locking rod 1044 outward. Part of the locking rod 1044 extends out of the slide groove 1043 and falls into the arc-shaped locking hole 1033. Because the diameter of the locking rod 1044 is the same as the width of the locking hole 1033, while the width of the insertion hole 1034 is smaller than the width of the locking hole 1033, the locking rod 1044 is reliably locked in the locking hole 1033 and cannot be pulled out axially, thereby achieving the locking and fixing of the mating shaft 104 and the hollow cylinder 1032.

[0035] When it is necessary to change the bending radius by replacing the mandrel 1041 with one of different diameters, press the outer limit blocks 1047 on both sides again to retract the locking rod 1044 into the slide groove 1043. At this time, the locking rod 1044 disengages from the locking hole 1033, and the slide rod 1045 re-enters the insertion hole 1034 area, allowing the connector 1042 to be pulled out of the hollow cylinder 1032. Replace it with a mandrel 1041 of another specification and repeat the above installation steps. This structure enables quick disassembly and reliable locking of the mating shaft 104, is easy to operate, and allows for flexible adjustment of the bending radius according to testing requirements.

[0036] like Figure 4 As shown, it also includes a test position changing mechanism 8 installed on the side of the mounting plate 1. The test position changing mechanism 8 includes a ball screw 81, a first motor 82, and a threaded seat 83. The first motor 82 is fixed to the lower front side of the mounting plate 1. The ball screw 81 is connected to the output shaft at the top of the first motor 82. The top of the ball screw 81 is connected to the stationary connection plate 4 through a bearing. The lower part of the ball screw 81 is connected to the fixed seat 1a through a bearing. The threaded seat 83 is threadedly connected to the ball screw 81. The threaded seat 83 is fixedly connected to the moving plate 9. The ball screw 81 is driven to rotate by the first motor 82, so that the moving plate 9 and its device move vertically, changing the bending position of the FPC connector body A under test.

[0037] When the bending test position of the FPC connector body A needs to be changed, the first motor 82 is started, driving the ball screw 81 to rotate around its own axis. The rotation of the ball screw 81 is converted into the linear motion of the threaded seat 83 through the threaded pair. Since the threaded seat 83 is fixed to the moving plate 9, and the moving plate 9 can slide vertically along the guide optical axis 7, the moving plate 9 and the multiple bending test mechanisms 10 mounted on it move smoothly in the vertical direction together. As the moving plate 9 rises or falls, the vertical positions of the mating shaft 104, upper limit shaft 105, lower limit shaft 106, and other components in the bending test mechanism 10 relative to the FPC connector body A change, thereby moving the bending point to different sections on the FPC connector body A. Through the forward and reverse rotation and speed control of the first motor 82, the height of the moving plate 9 can be accurately positioned, enabling bending fatigue testing of multiple different positions of the same or multiple FPC connector bodies A without disassembling or re-clamping the samples, significantly improving the comprehensiveness and automation of the testing.

[0038] like Figure 8As shown, it also includes a synchronous drive structure 11 installed on the other side of the movable plate 9. The synchronous drive structure 11 includes a second motor 111, a transmission shaft 112, a worm 113, and a worm wheel 114. The second motor 111 is fixedly installed on the rear left side of the movable plate 9. The right output shaft of the second motor 111 is connected to the left and right extending transmission shaft 112. The transmission shaft 112 is connected to the movable plate 9 through a bearing seat. Multiple worms 113 are concentrically connected on the transmission shaft 112. The number of worms 113 is the same as the number of rotating shafts 101. The rear end of each rotating shaft 101 is concentrically provided with a worm wheel 114. The worm wheel 114 meshes with its adjacent worm 113. The second motor 111 drives the transmission shaft 112 and the worm 113 to rotate, causing the worm wheel 114 to rotate, thereby driving the rotating shaft 101 to rotate.

[0039] When the rotating shaft 101 needs to be driven to rotate to perform a bending action, the second motor 111 is started. The output shaft of the motor drives the transmission shaft 112 to rotate, and all the worms 113 on the transmission shaft 112 rotate synchronously. Each worm 113 drives the worm wheel 114 meshing with it to rotate, and the worm wheel 114 in turn drives the corresponding rotating shaft 101 to rotate. Since all the worms 113 are driven by the same transmission shaft 112, and the transmission ratio between the worms 113 and the worm wheels 114 is the same, each rotating shaft 101 can achieve precise synchronous rotation, ensuring that multiple bending test mechanisms 10 simultaneously apply the same angle and the same period of bending action to their respective FPC connector bodies A. This synchronous drive structure 11 simplifies the power transmission route, avoids the phase difference that may occur when multiple motors are controlled separately, and ensures the consistency and repeatability of batch testing.

[0040] like Figure 9 As shown, it also includes information acquisition mechanisms 12 installed on the left and right sides of the bending test mechanism 10. The information acquisition mechanism 12 includes a mounting optical axis 121, a sliding sleeve 122, an information acquisition camera 123, a threaded sleeve 124, and a clamping bolt 125. The mounting optical axis 121 is installed on the front side of the moving plates 9 on the left and right sides of the bending test mechanism 10, extending back and forth. The sliding sleeve 122 is slidably arranged on the mounting optical axis 121, and can rotate on the mounting optical axis 121. The sliding sleeve 122 is close to the bending test machine. An information acquisition camera 123 is fixedly connected to one side of the structure 10. Because the sliding sleeve 122 can slide back and forth and rotate, the installation angle and front and rear installation position of the acquisition camera can be adjusted. A threaded sleeve 124 is provided on the other side of the sliding sleeve 122. A clamping bolt 125 is connected to the threaded sleeve 124 by threads. The clamping bolt 125 passes into the sliding sleeve 122 and its end contacts the outer surface of the mounting optical axis 121. The sliding sleeve 122 and its components are fixed to the mounting optical axis 121 by the clamping bolt 125.

[0041] Before testing, when the camera needs to be aimed at the center area of ​​the FPC connector body A for observation, first loosen the clamping bolt 125 to release the lock between the sliding sleeve 122 and the mounting optical axis 121. At this time, the operator can slide the sliding sleeve 122 back and forth along the mounting optical axis 121 to adjust the position of the camera in the front-back direction, so that the center of the camera lens is directly facing the center of the FPC connector body A; at the same time, the camera can be rotated around the mounting optical axis 121 by rotating the sliding sleeve 122 to adjust the camera's pitch or side angle, ensuring that the captured image is clear and unobstructed. After the camera is accurately aligned with the center position of the FPC connector body A, tighten the clamping bolt 125. The end of the clamping bolt 125 abuts against the outer surface of the mounting optical axis 121, and the sliding sleeve 122 and the information acquisition camera 123 on it are reliably fixed to the mounting optical axis 121 by friction.

[0042] Through the above structure, the information acquisition camera 123 can accurately target the middle bending area of ​​the FPC connector body A and collect visual information such as surface morphology, crack initiation and propagation, and delamination in real time during the bending fatigue process. This provides intuitive image data support for the assessment of flexible fatigue and bending life, and complements the electrical data of the resistance tester 2 to enhance the comprehensiveness and reliability of the test results.

[0043] like Figure 2 and Figure 6 As shown, it also includes a pull cord 13 installed on the rear side of the FPC connector body A to be tested. The pull cord 13 passes through the mating shafts 104 and also passes through the upper limit shaft 105 and the lower limit shaft 106. The top end of the pull cord 13 is connected to the stationary terminal block 4, and the bottom end of the pull cord 13 is connected to the moving terminal block 5. When the FPC connector to be tested is bent, the pull cord 13 bends synchronously, and the moving terminal block 5 is pulled upward by the pull cord 13, thereby relieving the burden on the lower terminal block 6.

[0044] During the bending test, when the rotating shaft 101 drives the rotating plate 102 to swing, and the mating shaft 104 applies a periodic bending action to the FPC connector body A, the pull rope 13 undergoes synchronous bending deformation along with the FPC connector body A. Since the two ends of the pull rope 13 are fixed to the stationary terminal plate 4 and the moving terminal plate 5 respectively, and the moving terminal plate 5 can slide vertically along the guide optical axis 7, when the bending action occurs, the pull rope 13 will generate an upward contraction or pulling tendency, thereby applying an upward pulling force to the moving terminal plate 5. This pulling force helps to overcome the downward pulling force generated by gravity or bending at the lower end of the moving terminal plate 5 and the connected FPC connector body A, thus sharing the mechanical pulling burden borne by the lower terminal 6 (i.e., the terminal 6 on the moving terminal plate 5), preventing the terminal 6 from experiencing poor contact or damage due to prolonged excessive pulling force. The auxiliary support of the pull rope 13 ensures the clamping stability of the FPC connector body A during the bending process, improving the reliability of the test and the service life of the terminal 6.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the flexibility fatigue and bending life of FPC connectors for foldable screens, characterized in that: The system includes a mounting plate (1), a resistance tester (2), and a power supply (3). The resistance tester (2) is mounted on the top of the mounting plate (1), and the power supply (3) is mounted on the bottom of the mounting plate (1). A stationary terminal block (4) is fixedly connected to the upper side of the mounting plate (1), and a movable terminal block (5) is vertically slidably connected to the lower side of the mounting plate (1). Both the movable terminal block (5) and the stationary terminal block (4) have terminals (6) on their opposite sides. The resistance tester (2), the power supply (3), and the terminals (6) are connected together. The two are connected by a line. A fixed seat (1a) is provided on the mounting plate (1) below the moving terminal block (5). A guide optical axis (7) is symmetrically arranged between the fixed seat (1a) and the opposite surface of the stationary terminal block (4). The moving terminal block (5) and the guide optical axis (7) are vertically slidably connected. A moving plate (9) is vertically slidably connected between the upper parts of the guide optical axis (7). A plurality of bending test mechanisms (10) are provided on the moving plate (9). The bending radius of the bending test mechanism (10) can be changed.

2. The device for testing the flexible fatigue and bending life of FPC connectors for foldable screens according to claim 1, characterized in that: The bending test mechanism (10) includes a row of rotating shafts (101) rotatably mounted on a movable plate (9). The front end of each rotating shaft (101) is connected to a rotating plate (102). Both ends of the rotating shaft (101) are rotatably mounted with mating sleeves (103). Each mating sleeve (103) is detachably connected with a mating shaft (104). An upper limit shaft (105) is rotatably mounted on the movable plate (9) above the rotating plate (102). A lower limit shaft (106) is rotatably mounted on the movable plate (9) above the rotating plate (102). The FPC connector body (A) to be tested passes between the mating shafts (104) and also between the upper limit shaft (105) and the lower limit shaft (106).

3. The device for testing the flexible fatigue and bending life of FPC connectors for foldable screens according to claim 2, characterized in that: The docking sleeve (103) includes rotating blocks (1031) rotatably mounted at both ends of the rotating plate (102). A hollow cylinder (1032) is fixed to the front end of the rotating block (1031). The hollow cylinder (1032) has symmetrical arc-shaped locking holes (1033). An insertion hole (1034) is provided on the hollow cylinder (1032) in front of the locking hole (1033). The insertion hole (1034) is connected to the adjacent locking hole (1033).

4. The device for testing the flexible fatigue and bending life of an FPC connector for foldable screens according to claim 3, characterized in that: The docking shaft (104) includes a mandrel (1041) with a connector (1042) at one end. The mandrel (1041) is inserted into the hollow cylinder (1032) through the connector (1042). The connector (1042) has symmetrically arranged grooves (1043) along its radial direction. Each groove (1043) is slidably connected with a locking rod (1044). Each locking rod (1044) is concentrically connected with a sliding rod (1045) at its outer end. The locking rod (1044) is partially outside the groove (1043). A spring (1046) is connected between the locking rod (1044) and the groove (1043). Each sliding rod (1045) is concentrically connected with an outer limiting block (1047) at its outer end.

5. The device for testing the flexible fatigue and bending life of an FPC connector for foldable screens according to claim 4, characterized in that: The diameter of the slide rod (1045) is smaller than the diameter of the locking rod (1044). The diameter of the slide rod (1045) is the same as the width of the insertion hole (1034). The diameter of the locking rod (1044) is the same as the width of the locking hole (1033). The diameter of the outer limiting block (1047) is larger than the diameter of the locking rod (1044).

6. The device for testing the flexible fatigue and bending life of an FPC connector for foldable screens according to claim 1, characterized in that: It also includes a test position changing mechanism (8) installed on the side of the mounting plate (1). The test position changing mechanism (8) includes a first motor (82) fixed below the side of the mounting plate (1). A ball screw (81) is connected to the output shaft of the first motor (82). A threaded seat (83) is threadedly connected to the ball screw (81). The threaded seat (83) is fixedly connected to the moving plate (9).

7. The device for testing the flexible fatigue and bending life of an FPC connector for foldable screens according to claim 2, characterized in that: It also includes a synchronous drive structure (11) installed on the other side of the movable plate (9). The synchronous drive structure (11) includes a second motor (111) installed on the other side of the movable plate (9). A transmission shaft (112) is connected to the output shaft of the second motor (111). Multiple worms (113) are concentrically connected on the transmission shaft (112). The number of worms (113) is the same as the number of rotating shafts (101). A worm wheel (114) is concentrically provided at the rear end of each rotating shaft (101). The worm wheel (114) meshes with its adjacent worm (113).

8. The device for testing the flexible fatigue and bending life of FPC connectors for foldable screens according to claim 2, characterized in that: It also includes information acquisition mechanisms (12) installed on the left and right sides of the bending test mechanism (10). The information acquisition mechanism (12) includes an installation optical axis (121) installed on the moving plates (9) on the left and right sides of the bending test mechanism (10). Sliding sleeves (122) are slidably arranged on the installation optical axis (121). The sliding sleeves (122) can rotate on the installation optical axis (121). An information acquisition camera (123) is fixedly connected to the side of the sliding sleeve (122) close to the bending test mechanism (10). A threaded sleeve (124) is provided on the other side of the sliding sleeve (122). A clamping bolt (125) is connected to the threaded sleeve (124) by thread. The clamping bolt (125) fixes the sliding sleeve (122) and its components on it to the installation optical axis (121).

9. A device for testing the flexible fatigue and bending life of an FPC connector for foldable screens according to claim 2, characterized in that: It also includes a pull cord (13) installed on the rear side of the body (A) of the FPC connector to be tested. The pull cord (13) passes between the mating shafts (104) and also between the upper limit shaft (105) and the lower limit shaft (106). The top end of the pull cord (13) is connected to the stationary terminal block (4), and the bottom end of the pull cord (13) is connected to the moving terminal block (5).

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