A test fixture for a fiber optic microbend test device

Abstract

The utility model relates to optical fiber test technical field, concretely relates to a kind of test tool for optical fiber microbend testing device, the technical problem to be aimed at solving in at overcoming the defect of test tool structure in prior art, mainly is realized by following technical scheme: a kind of test tool for optical fiber microbend testing device, including screening machine, screening machine includes test stand, rotating lever, support rod and rotary drive part, further include winding structure and wire structure, winding structure includes winding column, two limit disc and multiple abrasive disc, limit disc and abrasive disc are all installed on winding column, wire structure is installed at test stand top and is correspondingly arranged with winding structure, wire structure includes wire board, wire wheel part and wire drive part, setting multiple roughness abrasive disc obtains different microbend region and can be tested once to obtain different situation microbend attenuation curve, optical fiber is guided to reduce the possibility of fiber breakage in the middle before winding and setting.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber testing technology, and specifically to a testing fixture for an optical fiber micro-bending testing device. Background Technology

[0002] Fiber microbending loss occurs when an optical fiber is subjected to uneven stress, such as lateral pressure or temperature changes, causing the fiber axis to bend slightly and irregularly, resulting in the conversion of the propagating mode to the radiating mode and thus causing optical energy loss. Fiber microbending testing methods involve placing the fiber on a microbending fixture (such as an expansion drum, a fixed-size drum, or a metal mesh) to induce a microbending of a specific size.

[0003] Compared to other existing measuring devices, the fixed-size drum has a cylindrical structure with multiple turns of the fiber under test wound at an angle. This measuring device is easy to operate and can fully simulate the actual winding method of the fiber to evaluate the attenuation loss caused by micro-bending. However, the existing size drum has a single roughness mesh number. When it is necessary to evaluate the fiber micro-bending sensitivity under different roughness, different tooling needs to be changed and the test needs to be rewound. The whole process is time-consuming and laborious and is prone to test errors, affecting the test results. When using the fixed-size drum, it is directly installed on the screening machine for winding operation. The existing screening machine operates at high speed, so a corresponding wire structure is required to avoid fiber stacking or excessively sparse arrangement. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defects of the test fixture structure in the prior art, thereby providing a test fixture for a fiber micro-bending test device.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A testing fixture for an optical fiber micro-bending testing device includes a screening machine. The screening machine includes a test frame, a rotating rod, a support rod, and a rotation drive. The rotating rod and the support rod are mounted opposite each other on the test frame. The rotating rod is controlled to rotate by the rotation drive. The axes of the rotating rod and the support rod are both arranged along the length direction of the test frame. The fixture is characterized by further including a winding structure and a wire structure. The two ends of the winding structure are respectively mounted on the rotating rod and the support rod and are driven to rotate by the rotating rod. The winding structure includes a winding post, two limiting discs, and multiple polishing discs. A shaft hole coaxial with the winding post is provided on the winding post corresponding to the rotating rod and the support rod. The limiting discs are mounted at both ends of the winding post. The polishing discs are all mounted on the winding post. The wire structure is mounted on the top of the test frame and is arranged corresponding to the winding structure. The wire structure includes a wire plate, a wire wheel, and a wire drive. The wire drive controls the wire plate and the wire wheel to move synchronously along the length direction of the test frame.

[0007] By adopting the above technical solution, multiple polishing pads with different roughness can be selected according to the test requirements. By winding the optical fiber with different polishing pads, different microbending attenuation curves can be obtained in different microbending regions, which improves the adaptability of the test fixture and expands the application range of the test equipment. Multi-angle measurement can increase the accuracy of the measurement results. The fiber winding is guided by the conductor structure before winding, which can reduce the possibility of fiber breakage in the middle. The uniformity of the fiber winding arrangement can also be increased by the cooperation of the conductor structure.

[0008] Furthermore, a mounting pin extends from the center of the limiting plate near the winding post, and corresponding mounting holes are provided at both ends of the winding post corresponding to the mounting pin. The mounting pin is hexagonal with a side length greater than the radius of the shaft hole. A through hole with the same diameter as the shaft hole is also provided at the center of the mounting pin corresponding to the shaft hole. A locking ring also extends from the side of the limiting plate near the winding post. The locking ring is conical, and the end away from the limiting plate abuts against the outer wall of the grinding disc.

[0009] By adopting the above technical solution, the installation post can protect the wound optical fiber when the winding post is working at high speed, preventing the optical fiber from touching the side. It can also provide breakage protection when the optical fiber breaks, reducing damage to the test equipment. The limiting plate is installed by the installation post and the winding post. The structure is simple and easy to disassemble. The locking ring extending on the limiting plate can easily fix the edge grinding plate and the winding post.

[0010] Furthermore, the grinding disc is in the shape of a hollow ring, and the grinding disc is sleeved and mounted on the winding post and arranged in an array along the axial direction of the winding post, with a gap between two adjacent grinding discs.

[0011] By adopting the above technical solution, the roughness on multiple polishing plates increases or decreases sequentially. Setting different roughness facilitates precise testing of the micro-variation sensitivity of optical fibers. A gap is left between two polishing plates to facilitate the differentiation of different polishing plate positions.

[0012] Furthermore, each of the grinding discs is equipped with a winding coil, which is in the shape of a quarter circle and is set in close contact with the outer wall of the grinding disc. Both ends of the winding coil are provided with conical fixing holes, and the diameter of the two fixing holes at the end closer to each other is smaller than the diameter of the two fixing holes at the ends farther away from each other. Each of the grinding discs is also equipped with an isolation flange at the end away from the winding coil, which is in the shape of a quarter circle and is offset from the winding coil.

[0013] By adopting the above technical solution, the arc-shaped winding coil fixes the initial position of the optical fiber, which facilitates the subsequent automatic winding and arrangement of the optical fiber; the winding coil, together with the isolation flange, forms a partition for a single polishing disc, but it is not a complete partition. A single polishing disc can be used alone, or multiple polishing discs can be combined and used by directly winding continuously.

[0014] Furthermore, the length direction of the guide plate is perpendicular to the axis of the rotating rod, and the height of the end near the rotating rod is lower than the height of the end away from the rotating rod. A circular guide channel is also provided through the guide plate along its length direction. Both ends of the guide channel are provided with conical outward expansion holes with a diameter larger than the diameter of the guide channel. A guide wheel is provided at the end of the guide plate near the rotating rod.

[0015] By adopting the above technical solution, the optical fiber passes through the conductor channel and then enters the conductor wheel. The conductor plate guides and arranges the optical fiber. Since the optical fiber is wound on the winding post at a certain angle, the external expansion holes at both ends of the conductor channel can help the optical fiber to deflect at a certain angle and reduce the friction between the optical fiber and the conductor channel.

[0016] Furthermore, the guide wheel component includes a guide frame, a guide wheel, and a vibrating wheel assembly. The guide frame is U-shaped with its opening facing downwards and is arranged side by side with the guide plate. The guide wheel is rotatably mounted inside the guide frame and has a guide groove around its outer circumference. The vibrating wheel assembly is vertically slidably arranged inside the guide frame and mounted above the guide wheel.

[0017] By adopting the above technical solution, the tension during the fiber delivery process can be adjusted by setting the guide wheel in conjunction with the vibrating wheel group, which can prevent the fiber from collapsing in the middle due to excessive travel during the fiber delivery process. It can also control the connection between the vibrating wheel group and the drive signal at the delivery point to prevent the fiber from breaking.

[0018] Furthermore, the vibrating wheel assembly includes a telescopic rod, a compression spring, a sliding frame, and a pressure wheel. The sliding frame slides relative to the guide frame and is U-shaped with its opening facing downwards. The pressure wheel is rotatably mounted inside the sliding frame. The telescopic rod is fixed to the top of the sliding frame and also to the top inside the guide frame. The compression spring is sleeved on the telescopic rod and its two ends abut against the top outside the sliding frame and the top inside the guide frame, respectively.

[0019] By adopting the above technical solution, the vibrating wheel group, together with the wire guide wheel, restricts the optical fiber to be transported in a small space, ensuring uniform subsequent arrangement, and provides fine and flexible guidance during the optical fiber arrangement process to avoid the risk of fiber breakage caused by rigid guidance.

[0020] Furthermore, a drive plate extends from the top of the lead plate. The drive plate is controlled by a lead drive component to drive the lead plate and lead wheel components to move. The lead drive component includes a drive motor, a sliding rod, and a guide rod. The axes of the sliding rod and the guide rod are both set along the length of the test frame. The sliding rod is a threaded rod and is arranged parallel to the guide rod. The drive motor controls the rotation of the sliding rod. The drive plate is sleeved on the sliding rod and threadedly connected to the sliding rod. The guide rod also passes through the drive plate.

[0021] By adopting the above technical solution, the drive motor controls the sliding rod to rotate, thereby driving the drive plate, which is screwed to the sliding rod and limited by the guide rod, to slide. This causes the lead plate and lead wheel to slide above the test frame. The rotation speed of the rotating drive component is controlled synchronously, so that the optical fiber is arranged closely on the winding post with non-overlapping movement gaps to complete the winding operation, which facilitates the subsequent optical fiber micro-bending test.

[0022] In summary, the technical solution of this utility model has the following advantages:

[0023] 1. The test fixture for fiber microbending testing device provided by this utility model is equipped with multiple polishing plates with different roughnesses, which can be selected according to the test requirements. By winding the fiber with different polishing plates, different microbending attenuation curves can be obtained in different microbending regions, which improves the adaptability of the test fixture and expands the application range of the test equipment. Multi-angle measurement can increase the accuracy of the measurement results.

[0024] 2. The test fixture for the fiber micro-bending test device provided by this utility model can reduce the possibility of fiber breakage by guiding the fiber through the conductor structure before winding, and can also increase the uniformity of fiber winding arrangement through the cooperation of the conductor structure. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall structure of a test fixture for a fiber optic micro-bending test device provided in one embodiment of the present invention;

[0027] Figure 2 This is a partially exploded view of the winding structure provided in one embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of the winding coil provided in one embodiment of the present invention;

[0029] Figure 4 This is a cross-sectional view of a conductor plate provided in one embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Screening machine; 11. Test frame; 12. Rotating rod; 13. Support rod; 14. Rotation drive component; 2. Winding structure; 3. Winding column; 31. Shaft hole; 32. Mounting hole; 4. Limiting plate; 41. Mounting column; 411. Through hole; 42. Engaging ring; 5. Grinding disc; 51. Winding coil; 511. Fixing hole; 52. Isolation flange; 6. Wire structure; 7. Wire plate; 71. Wire channel; 711. Outward expansion hole; 72. Drive plate; 8. Wire wheel component; 81. Guide frame; 82. Wire guide wheel; 821. Wire guide groove; 83. Vibrating wheel group; 831. Telescopic rod; 832. Compression spring; 833. Sliding frame; 834. Pressure wheel; 9. Wire drive component; 91. Drive motor; 92. Sliding rod; 93. Guide rod. Detailed Implementation

[0032] 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 only for explaining the present invention and are not intended to limit the present invention.

[0033] A test fixture for a fiber optic microbending test device, such as Figure 1 and Figure 2 As shown, the device includes a screening machine 1, which includes a U-shaped test frame 11 with the opening facing upward, a rotating rod 12, a support rod 13, and a rotation drive 14. The rotating rod 12 and the support rod 13 are mounted opposite each other at both ends of the test frame 11. The rotating rod 12 is controlled to rotate by the rotation drive 14. The axes of the rotating rod 12 and the support rod 13 are both set along the length direction of the test frame 11.

[0034] A test fixture for an optical fiber micro-bending test device further includes a winding structure 2 and a wire structure 6. The two ends of the winding structure 2 are respectively mounted on a rotating rod 12 and a support rod 13 and are driven to rotate by the rotating rod 12. The winding structure 2 includes a winding post 3, two limiting discs 4, and multiple polishing discs 5; in this application, three polishing discs 5 are provided. The wire structure 6 is mounted on the top of the test frame 11 and is correspondingly arranged to the winding structure 2. The wire structure 6 includes a wire plate 7, wire wheels 8, and a wire drive 9. The wire drive 9 controls the wire plate 7 and the wire wheels 8 to move synchronously along the length direction of the test frame 11.

[0035] Setting up multiple polishing pads 5 with different roughnesses can be selected according to the test requirements. By winding the fiber with different polishing pads 5, different microbending attenuation curves can be obtained in different microbending areas, which improves the adaptability of the test fixture and expands the application range of the test equipment. Multi-angle measurement can increase the accuracy of the measurement results. The fiber can be guided by the conductor structure 6 before winding, which can reduce the possibility of fiber breakage in the middle. The conductor structure 6 can also increase the uniformity of fiber winding arrangement.

[0036] like Figure 1and Figure 2 As shown, the winding post 3 has a shaft hole 31 coaxial with the winding post 3, which passes through the rotating rod 12 and the support rod 13. In order to reduce the rotational driving force of the winding post 3, the winding post 3 can be designed as a hollow structure of 0.5mm thick ABS material.

[0037] The limiting plate 4 is installed at both ends of the winding post 3, and the grinding discs 5 are all installed on the winding post 3. A mounting pin 41 extends from the center of the limiting plate 4 near the winding post 3. Corresponding mounting pins 41 are provided at both ends of the winding post 3, with mounting holes 32 corresponding to the mounting pins 41. The mounting pins 41 are hexagonal with a side length greater than the radius of the shaft hole 31. A through hole 411 with the same diameter as the shaft hole 31 is also provided at the center of the mounting pin 41 corresponding to the shaft hole 31. The limiting plate 4 is installed by engaging the mounting pins 41 with the winding post 3, resulting in a simple structure that is easy to disassemble. The mounting pins 41 protect the wound optical fiber when the winding post 3 is operating at high speed, preventing the fiber from touching the side. They also provide breakage protection in case of fiber breakage, reducing damage to the testing equipment.

[0038] A retaining ring 42 extends from the side of the limiting disc 4 near the winding post 3. The retaining ring 42 is conical, and its end away from the limiting disc 4 abuts against the outer wall of the grinding plate 5. The retaining ring 42 extending from the limiting disc 4 facilitates the fixing of the edge grinding plate 5 and the winding post 3.

[0039] like Figure 2 and Figure 3 As shown, the polishing pad 5 is a hollow ring, and it is mounted on the winding post 3 in an array along the axial direction of the winding post 3, with a gap between two adjacent polishing pads 5. Setting different roughnesses facilitates precise testing of the fiber's micro-variation sensitivity, and the gap between the two polishing pads 5 facilitates distinguishing the positions of different polishing pads 5. In this application, the polishing pad 5 is 0.3mm thick sandpaper with adhesive backing for fixing to the winding post 3, and the roughnesses of the polishing pads 5 are 600, 800, and 1000 mesh, respectively.

[0040] Each polishing pad 5 is equipped with a winding coil 51, which is in the shape of a quarter-circle arc and is set against the outer wall of the polishing pad 5. Both ends of the winding coil 51 are provided with conical fixing holes 511, and the diameter of the two fixing holes 511 at the end closer to each other is smaller than the diameter of the two ends farther apart. The arc-shaped winding coil 51 fixes the initial position of the optical fiber, which facilitates the subsequent automatic winding and arrangement of the optical fiber.

[0041] Each grinding disc 5 has an isolation flange 52 installed at the end furthest from the winding coil 51. The isolation flange 52 is in the shape of a quarter circle and is offset from the winding coil 51. The winding coil 51 and the isolation flange 52 are arranged in pairs, one above the other and one to the left and one to the right. The winding coil 51 and the isolation flange 52 together form a partition for a single grinding disc 5, but not a complete partition. A single grinding disc 5 can be used alone, or multiple grinding discs 5 can be combined and used by continuous winding. For example, as shown in the figure, if each winding coil 51 is located at the upper left end, then each isolation flange 52 is located at the lower right end. The winding coil 51 and the isolation flange 52 are symmetrically arranged about the center of the winding post 3.

[0042] like Figure 1 and Figure 4 As shown, the length direction of the conductor plate 7 is perpendicular to the axis of the rotating rod 12, and the height of the end near the rotating rod 12 is lower than the height of the end away from the rotating rod 12. A circular conductor channel 71 is also formed through the conductor plate 7 along its length. Conical outward-expanding holes 711 with a diameter larger than the diameter of the conductor channel 71 extend from both ends of the conductor channel 71, and the outward-expanding holes 711 have a smooth transition design with the ends of the conductor channel 71. After passing through the conductor channel 71, the optical fiber enters the conductor wheel 8. The conductor plate 7 guides and arranges the optical fiber. Since the optical fiber is wound at a certain angle on the winding post 3, the outward-expanding holes 711 at both ends of the conductor channel 71 can help the optical fiber achieve a certain angle of deflection and reduce friction between the optical fiber and the conductor channel 71.

[0043] like Figure 1 , Figure 2 and Figure 3 As shown, a wire guide wheel 8 is provided at one end of the wire guide plate 7 near the rotating rod 12. The wire guide wheel 8 includes a guide frame 81, a wire guide wheel 82, and a vibrating wheel assembly 83. The guide frame 81 is U-shaped with its opening facing downwards and is arranged parallel to the wire guide plate 7. The guide frame 81 is fixed to the side wall of the drive plate 72. The wire guide wheel 82 is rotatably mounted inside the guide frame 81, and a wire guide groove 821 is provided around the outer circumference of the wire guide wheel 82. The vibrating wheel assembly 83 is vertically slidably arranged inside the guide frame 81 and mounted above the wire guide wheel 82. The wire guide wheel 82, in conjunction with the vibrating wheel assembly 83, adjusts the tension during the fiber optic cable delivery process to prevent the fiber optic cable from collapsing in the middle due to excessive travel during delivery.

[0044] A corresponding sensor can be added to connect the vibrating wheel assembly 83 to the drive signal control at the cable feeding point. The cable feeding speed can be controlled by the sliding height of the vibrating wheel assembly 83, thereby preventing fiber breakage. The vibrating wheel assembly 83 includes a telescopic rod 831, a compression spring 832, a sliding frame 833, and a pressure roller 834. The sliding frame 833 slides relative to the guide frame 81 and is U-shaped with its opening facing downwards. The pressure roller 834 is rotatably mounted inside the sliding frame 833. The telescopic rod 831 is fixed to the top of the sliding frame 833 and also to the top inside the guide frame 81. The compression spring 832 is sleeved on the telescopic rod 831, with its two ends abutting against the top outside the sliding frame 833 and the top inside the guide frame 81, respectively. The vibrating wheel assembly 83, in conjunction with the cable guide roller 82, confines the optical fiber to a smaller space for delivery, ensuring uniform subsequent arrangement and providing fine, flexible guidance during fiber arrangement to avoid the risk of fiber breakage caused by rigid guidance.

[0045] like Figure 1 and Figure 4 As shown, a drive plate 72 extends from the top of the lead plate 7. The drive plate 72 is controlled by the lead drive component 9 to move the lead plate 7 and the lead wheel component 8. The lead drive component 9 includes a drive motor 91, a sliding rod 92, and a guide rod 93. The axes of the sliding rod 92 and the guide rod 93 are both set along the length of the test frame 11. The sliding rod 92 is a threaded rod and is arranged parallel to the guide rod 93. The drive motor 91 controls the sliding rod 92 to rotate. The drive plate 72 is sleeved on the sliding rod 92 and threadedly connected to the sliding rod 92. The guide rod 93 also passes through the drive plate 72. The drive motor 91 controls the sliding rod 92 to rotate, thereby driving the drive plate 72, which is threaded to the sliding rod 92 and limited by the guide rod 93, to slide. This causes the lead plate 7 and the lead wheel component 8 to slide above the test frame 11. The rotation speed of the rotation drive component 14 is controlled synchronously, thereby realizing that the optical fibers are tightly arranged on the winding post 3 with non-overlapping movement gaps to complete the winding operation, which is convenient for subsequent optical fiber micro-bending tests.

[0046] The working principle and usage of the test fixture for the fiber microbending test device are as follows: Select the corresponding polishing disc 5 according to the test requirements. First, pass the fiber through the guide plate 7 and the guide wheel 8. Then, insert and fix the end of the fiber to be tested into the fixing hole 511. Select the corresponding fixing hole 511 according to the rotation direction of the winding post 3 and the fiber winding direction. Then, start the screening machine 1 to realize the automatic winding and arrangement of the fiber. Finally, use an optical time domain reflectometer to test the attenuation loss caused by fiber microbending.

[0047] The foregoing description illustrates and describes preferred embodiments of the present invention. As previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A testing fixture for an optical fiber micro-bending testing device, comprising a screening machine (1), the screening machine (1) comprising a test frame (11), a rotating rod (12), a support rod (13), and a rotation drive (14), wherein the rotating rod (12) and the support rod (13) are mounted opposite to each other on the test frame (11), the rotating rod (12) is controlled to rotate by the rotation drive (14), and the axes of the rotating rod (12) and the support rod (13) are both arranged along the length direction of the test frame (11), characterized in that, It also includes a winding structure (2) and a wire structure (6). The two ends of the winding structure (2) are respectively mounted on the rotating rod (12) and the support rod (13) and driven to rotate by the rotating rod (12). The winding structure (2) includes a winding post (3), two limiting disks (4) and multiple grinding discs (5). The winding post (3) has a shaft hole (31) that is coaxial with the winding post (3) through it, corresponding to the rotating rod (12) and the support rod (13). The limiting disks (4) are installed at both ends of the winding post (3). The grinding discs (5) are all installed on the winding post (3). The wire structure (6) is installed on the top of the test frame (11) and is set in correspondence with the winding structure (2). The wire structure (6) includes a wire plate (7), a wire wheel (8) and a wire drive (9). The wire drive (9) controls the wire plate (7) and the wire wheel (8) to move synchronously along the length direction of the test frame (11).

2. The test fixture for an optical fiber micro-bending test device according to claim 1, characterized in that, The center of the limiting disk (4) extends from the side of the winding post (3) with a mounting pin (41). The winding post (3) has corresponding mounting holes (32) at both ends corresponding to the mounting pins (41). The mounting pins (41) are hexagonal and the side length is greater than the radius of the shaft hole (31). The center of the mounting pins (41) also has a through hole (411) with the same diameter as the shaft hole (31). The limiting disk (4) also extends from the side of the winding post (3) with a locking ring (42). The locking ring (42) is conical and the end away from the limiting disk (4) abuts against the outer wall of the grinding disc (5).

3. The test fixture for an optical fiber micro-bending test device according to claim 2, characterized in that, The grinding disc (5) is a hollow ring. The grinding disc (5) is sleeved and installed on the winding post (3) and arranged in an array along the axial direction of the winding post (3). There is a gap between two adjacent grinding discs (5).

4. The test fixture for an optical fiber micro-bending test device according to claim 3, characterized in that, Each of the grinding discs (5) is equipped with a winding coil (51). The winding coil (51) is in the shape of a quarter circle and is set in close contact with the outer wall of the grinding disc (5). Both ends of the winding coil (51) are provided with conical fixing holes (511). The diameter of the two fixing holes (511) at the end closer to each other is smaller than the diameter of the two ends farther away from each other. Each of the grinding discs (5) is also equipped with an isolation flange (52) at the end away from the winding coil (51). The isolation flange (52) is in the shape of a quarter circle and is offset from the winding coil (51).

5. The test fixture for an optical fiber micro-bending test device according to claim 1, characterized in that, The length direction of the guide plate (7) is perpendicular to the axis of the rotating rod (12), and the height of the end near the rotating rod (12) is lower than the height of the end away from the rotating rod (12). A circular guide channel (71) is also provided on the guide plate (7) along its length direction. The two ends of the guide channel (71) are provided with conical outward expansion holes (711) with a diameter larger than the diameter of the guide channel (71). A guide wheel (8) is provided at the end of the guide plate (7) near the rotating rod (12).

6. The test fixture for an optical fiber micro-bending test device according to claim 5, characterized in that, The wire guide wheel component (8) includes a guide frame (81), a wire guide wheel (82), and a vibrating wheel assembly (83). The guide frame (81) is U-shaped with its opening facing downward and is arranged in parallel with the wire guide plate (7). The wire guide wheel (82) is rotatably mounted inside the guide frame (81) and has a wire guide groove (821) around its outer periphery. The vibrating wheel assembly (83) is vertically slidably arranged inside the guide frame (81) and mounted above the wire guide wheel (82).

7. The test fixture for an optical fiber micro-bending test device according to claim 6, characterized in that, The vibrating wheel assembly (83) includes a telescopic rod (831), a compression spring (832), a sliding frame (833), and a pressing wheel (834). The sliding frame (833) slides relative to the guide frame (81) and is U-shaped with the opening facing downwards. The pressing wheel (834) is rotatably mounted inside the sliding frame (833). The telescopic rod (831) is fixed to the top of the sliding frame (833) and also fixed to the top inside the guide frame (81). The compression spring (832) is sleeved on the telescopic rod (831) and its two ends abut against the top outside the sliding frame (833) and the top inside the guide frame (81), respectively.

8. The test fixture for an optical fiber micro-bending test device according to claim 7, characterized in that, The top of the guide plate (7) also extends a drive plate (72). The drive plate (72) is controlled by the guide drive component (9) to drive the guide plate (7) and the guide wheel component (8) to move. The guide drive component (9) includes a drive motor (91), a sliding rod (92) and a guide rod (93). The axes of the sliding rod (92) and the guide rod (93) are both set along the length direction of the test frame (11). The sliding rod (92) is a threaded rod and is arranged in parallel with the guide rod (93). The drive motor (91) controls the sliding rod (92) to rotate. The drive plate (72) is sleeved on the sliding rod (92) and threadedly connected to the sliding rod (92). The guide rod (93) also passes through the drive plate (72).

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