Device and method for testing torsion resistance of optical fiber

Abstract

The invention relates to the technical field of optical fiber measurement, in particular to an optical fiber torsion resistance testing device which comprises a testing table, and an automatic pay-off mechanism, a pay-off control mechanism, an optical fiber pressing and releasing mechanism, an optical fiber torsion recognition mechanism and an optical fiber rotary clamping mechanism which are sequentially arranged on the same side of the testing table in the length direction of the testing table. Wherein a to-be-tested optical fiber is led out from the optical fiber disc and sequentially passes through the pay-off control mechanism, the optical fiber pressing and releasing mechanism and the optical fiber rotating and clamping mechanism, the optical fiber rotating and clamping mechanism drives the to-be-tested optical fiber to move in the length direction of the test board, and the naturally drooping to-be-tested optical fiber passes through a detection area of the optical fiber distortion identification mechanism; and the optical fiber back-twisting action is performed according to the twisting direction of the to-be-detected optical fiber detected by the optical fiber twisting identification mechanism. Mechanical automatic control is achieved, and errors caused by manual operation are reduced. Meanwhile, the distortion direction and the distortion degree of the optical fiber are detected through the optical fiber distortion identification mechanism, so that the accuracy of the optical fiber distortion degree test is ensured. The invention further discloses a corresponding testing method.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber measurement technology, and in particular to an optical fiber twisting degree testing device and method. Background Art

[0002] Standard single-mode optical fibers will inevitably deviate from perfect circular symmetry in actual use, even if the deviation is very small. Due to the deviation from perfect circular symmetry, the two orthogonal polarization planes are no longer arbitrarily selected, and the two polarization modes will propagate along the fiber with a time difference, thus causing polarization mode dispersion (PMD).

[0003] Polarization mode dispersion of optical fiber is the main factor limiting the development of long-distance, high-speed optical transmission network systems. There are two main methods to improve PMD. The first is to improve the refractive index and stress symmetry of the optical fiber. The key to this method is to control the existing optical fiber production process to ensure that the produced optical fiber has good geometric symmetry and reduce the stress on the optical fiber. The second method is to use the twisting process in the optical fiber drawing process to effectively reduce the stress and elliptical birefringence of the optical fiber. The twisting of the optical fiber can be checked by recording the twisting of the optical fiber in the take-up reel.

[0004] The patent has been published, with application number CN201710613594.7, which discloses a device and method for measuring the twist of optical fiber, and specifically discloses a test bench, an optical fiber clamp and a fiber tray arranged on the test bench, on which the twisted optical fiber to be tested is wound, and the optical fiber to be tested is unwound from the fiber tray and inserted into the optical fiber clamp and clamped by it; the test bench is provided with a horizontal linear slide rail, and the optical fiber clamp has two slide rails that can slide in the slide rails, one of which is provided with a rotary driver, and the rotary driver drives the optical fiber clamp to rotate around its own axis; after the two optical fiber clamps synchronously clamp the optical fiber to be tested, one of the optical fiber clamps rotates to drive the optical fiber to untwist, and the rotating optical fiber clamp is provided with a rotation angle collector. Through the operation of the clamp and the rotary driver, the twist direction of the optical fiber is observed, and the twist of the optical fiber is read and recorded.

[0005] The technical solution of the above patent can test the twist of the optical fiber more accurately. However, when testing the above patent, it is necessary to manually judge the twist direction of the optical fiber and whether the optical fiber has been completely untwisted, which can easily cause measurement errors and lead to inaccurate measurement of the twist of the optical fiber. Summary of the invention

[0006] In order to solve at least one of the above technical problems, the present invention proposes an optical fiber twist test device and method, which solves the problem of inaccurate detection results caused by human factors in the detection of the twist direction and twist of the optical fiber to be tested in the prior art, and improves the accuracy of optical fiber twist measurement.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A first aspect of the present invention provides an optical fiber twist test device, comprising:

[0009] Test bench;

[0010] A wire release control mechanism, fixedly arranged on the test bench, for detecting the tension of the optical fiber to be tested;

[0011] Automatic pay-off mechanism, used to place the optical fiber reel and control the pay-off speed of the optical fiber reel according to the tension of the optical fiber to be tested;

[0012] An optical fiber pressing and releasing mechanism is fixedly arranged on the test bench, and is used to fix the optical fiber to be tested to form a fixed end of the optical fiber to be tested;

[0013] An optical fiber twist identification mechanism, fixedly arranged on the test bench, for detecting the twist direction of the optical fiber to be tested;

[0014] An optical fiber rotating clamping mechanism is arranged on the test bench and is movable along the length direction of the test bench. The optical fiber rotating clamping mechanism is used to clamp and rotate the free end of the optical fiber to be tested around its own axis, and is used to perform a back-twisting action on the optical fiber to be tested. The optical fiber rotating clamping mechanism rotates relative to the test bench so that the optical fiber to be tested is in a relatively free hanging state during the test process.

[0015] The automatic pay-off mechanism, the pay-off control mechanism, the optical fiber pressing and releasing mechanism, the optical fiber twisting identification mechanism and the optical fiber rotating clamping mechanism are sequentially arranged on the same side of the test bench along the length direction of the test bench;

[0016] The optical fiber to be tested is led out from the optical fiber reel and passes through the pay-off control mechanism, the optical fiber pressing and releasing mechanism and the optical fiber rotation clamping mechanism in sequence. The optical fiber rotation clamping mechanism drives the optical fiber to be tested to move along the length direction of the test bench. The naturally drooping optical fiber to be tested passes through the detection area of ​​the optical fiber twisting identification mechanism, and the optical fiber detwisting action is performed according to the twisting direction of the optical fiber to be tested detected by the optical fiber twisting identification mechanism.

[0017] Preferably, the automatic wire-releasing mechanism comprises:

[0018] Cable-laying bracket, used to place the optical fiber tray;

[0019] A first driving device, fixedly arranged on one side of the pay-off bracket, for driving the optical fiber reel to rotate;

[0020] The disk shaft has one end connected to the output end of the first driving device and the other end fixedly connected to the optical fiber disk. The disk shaft is rotatably arranged on the wire-releasing bracket through a bearing assembly.

[0021] Preferably, the line release control mechanism comprises:

[0022] A support portion is fixedly arranged at one end of the test bench, and a mounting hole is arranged at one end of the support portion away from the test bench, a connecting shaft is rotatably arranged in the mounting hole, and both ends of the connecting shaft extend out of the mounting hole;

[0023] A disc-shaped cam, one side of which is fixedly connected to one end of the connecting shaft;

[0024] A slide rod, wherein at least one adjustment hole is provided along the length direction of the slide rod, and an end of the connecting shaft away from the disc cam is movably fixed to the adjustment hole;

[0025] A spring, one end of which is connected to the slide bar, and the other end of which is connected to the test bench;

[0026] A first guide wheel is rotatably arranged at one end of the slide bar away from the spring and is located on the opposite side of the slide bar from the disc cam, and a first optical fiber groove is provided on the outer peripheral side of the first guide wheel for facilitating the placement of the optical fiber to be tested;

[0027] A distance sensor is arranged directly below the disc cam and has an installation distance with the disc cam;

[0028] When the tension of the optical fiber to be measured changes, the first guide wheel is pressed down or lifted up to drive the sliding rod to rotate around the connecting shaft, thereby driving the disc cam to rotate, so that the distance between the disc cam and the distance sensor changes, and the automatic pay-off mechanism controls the pay-off speed according to the detection result of the distance sensor.

[0029] Preferably, the optical fiber pressing and releasing mechanism comprises:

[0030] A second guide wheel is arranged on the test bench, the rotation center axis of the second guide wheel is parallel to the rotation center axis of the first guide wheel, the outer peripheral side of the second guide wheel is provided with a second optical fiber groove for facilitating the placement of the optical fiber to be tested, and the second optical fiber groove and the first optical fiber groove are located in the same plane;

[0031] A pressing wheel cooperates with the second guide wheel, and when the pressing wheel is pressed into or lifted out of the second optical fiber groove, the optical fiber to be tested is pressed or released;

[0032] A pressing and releasing assembly, used for driving the pressing wheel to press into or lift out of the second optical fiber groove, the pressing and releasing assembly comprising:

[0033] A mounting portion, fixed to the test bench;

[0034] A second driving device is fixed to the mounting portion;

[0035] A guide rod, one end of which is fixedly connected to the pressure wheel, and the other end of which is connected to the output end of the second driving device;

[0036] The second driving device drives the guide rod to extend and retract along its length direction, thereby driving the pressing wheel to press into or lift out of the second optical fiber groove.

[0037] Preferably, the optical fiber rotation clamping mechanism is a rotating air gripper, and the rotating air gripper comprises:

[0038] Servo motor;

[0039] A rotating shaft connected to an output end of the servo motor;

[0040] A plurality of air gripper fingers are rotatably fixed to an end of the rotating shaft away from the servo motor, and the plurality of air gripper fingers are evenly distributed around the central axis of the rotating shaft;

[0041] The piston cylinder is connected to the plurality of the air gripper fingers, and the piston cylinder is used to drive the plurality of the air gripper fingers to open or close so as to grasp or release the optical fiber to be tested.

[0042] Preferably, the optical fiber twist identification mechanism comprises:

[0043] A detection plate is movably arranged at the lower part of the test bench, wherein the detection plate has a plurality of detection holes in a rectangular array, and the plurality of detection holes form a detection area of ​​the detection plate, and the naturally drooping optical fiber to be tested is located in the detection area;

[0044] A plurality of groups of optical fiber position sensors are used to determine the twisting direction of the optical fiber by detecting the vertical distance between the optical fiber to be tested in a naturally drooping state between each group of optical fiber position sensors and the detection plate. The plurality of groups of optical fiber position sensors are movably fixed in the detection hole by limiting components.

[0045] Preferably, the optical fiber twist test device further comprises a moving mechanism, and the moving mechanism comprises:

[0046] A slide rail, fixed on the test bench along the length direction of the test bench;

[0047] A first slider is slidably disposed on the slide rail, and the optical fiber pressing and releasing mechanism is fixed to the first slider;

[0048] A second slider is slidably disposed on the slide rail, and the optical fiber rotation clamping mechanism is fixed to the second slider;

[0049] The third driving device is used to drive the second slider to slide along the slide rail. The third driving device includes a rack parallel to the slide rail and fixed to the test bench, a gear matched with the rack, and a mobile motor whose output end is fixed to the gear for driving the gear to rotate.

[0050] Preferably, the optical fiber twist testing device also includes an optical fiber cutting mechanism for cutting off the fixed end of the optical fiber to be tested, the optical fiber cutting mechanism is fixed to the side of the mounting portion close to the optical fiber rotation clamping mechanism, the optical fiber cutting mechanism is a parallel opening and closing air claw, the parallel opening and closing air claw includes a cylinder body fixed to the mounting portion, two clamping fingers running back to back or towards each other to form an opening and closing action, and a cutting piece arranged between the two clamping fingers; when the clamping fingers move towards each other, the cutting piece touches and cuts the optical fiber to be tested located between the cutting pieces.

[0051] A second aspect of the present invention provides a method for testing optical fiber twist, which is implemented based on the optical fiber twist testing device described in the first aspect and includes the following steps:

[0052] S1, installing the optical fiber reel on the pay-off bracket, taking the optical fiber to be tested and passing it through the first guide wheel and the second guide wheel in sequence, starting the first driving device, and winding off the untwisted optical fiber on the optical fiber reel;

[0053] S2, start the third driving device, move the rotating air claw toward the second guide wheel, and after the rotating air claw clamps the free end of the optical fiber to be tested, start the third driving device and the first driving device, move the rotating air claw away from the second guide wheel to the set position, and then close the third driving device and the first driving device, and keep the optical fiber to be tested in a horizontal straightened state during the movement;

[0054] S3, starting the second driving device to drive the pressing wheel to press downward into the second optical fiber groove and fix the optical fiber to be tested in the second optical fiber groove;

[0055] S4, start the third driving device, move the rotating air claw toward the second guide wheel, so that the optical fiber to be tested between the second guide wheel and the rotating air claw naturally droops, and at the same time, determine the twisting direction of the optical fiber to be tested according to the optical fiber position sensor, and start the servo motor to drive the air claw finger to perform a rotational untwisting action in the opposite direction of the twisting direction of the optical fiber to be tested, until the untwisting of the optical fiber to be tested is completed; the rotation angle of the servo motor is the twisting degree of the optical fiber to be tested;

[0056] S5, start the parallel opening and closing air claws to cut off the optical fiber to be tested;

[0057] S6, repeating the above steps S2-S5, performing multiple back-twist tests, and obtaining the average twist degree of the optical fiber to be tested.

[0058] Preferably, S4 comprises the following steps:

[0059] S41, according to the parabolic path of the naturally drooping optical fiber to be tested, with the symmetry axis of the parabola as the symmetry center, the optical fiber to be tested is divided into a symmetrical first optical fiber segment to be tested and a second optical fiber segment to be tested, wherein the first optical fiber segment to be tested is connected to a rotating air gripper, and the second optical fiber segment to be tested is connected to a pressure wheel and a second guide wheel; a plurality of groups of optical fiber position sensors are respectively arranged on the parabolic paths of the first optical fiber segment to be tested and the second optical fiber segment to be tested that dynamically change, so as to measure the twisting degree of the optical fiber to be tested at different time nodes;

[0060] S42, determining the twisting direction of the optical fiber to be tested by detecting the vertical distance change between the first optical fiber segment to be tested and the second optical fiber segment to be tested and the detection plate according to the optical fiber position sensor, that is, moving away from or approaching the detection plate, and driving the air gripper finger to perform a rotational untwisting action opposite to the twisting direction of the optical fiber to be tested by a servo motor;

[0061] S43, when the lowest point of the natural droop of the optical fiber to be tested is parallel to the center line of the detection holes on the detection plate at the same height; and / or, when the optical fiber position sensor detects that the distances between the first optical fiber segment to be tested and the second optical fiber segment to be tested and the detection plate remain unchanged, the servo motor is turned off, the rotating air gripper stops working, and the detwisting of the optical fiber to be tested is completed.

[0062] Compared with the prior art, the optical fiber twist test device and method provided by the present invention have the following beneficial effects:

[0063] 1. The present invention provides an automatic pay-off mechanism, a pay-off control mechanism, an optical fiber pressing and releasing mechanism, and an optical fiber rotating clamping mechanism on the test bench, so that the pay-off, clamping, fixing, and movement of the optical fiber are all mechanically controlled automatically, thereby reducing the error caused by human operation. At the same time, the optical fiber twisting identification mechanism detects the twisting direction and twisting degree of the optical fiber, further ensuring the accuracy of the optical fiber twisting degree test, so that the measured optical fiber twisting degree can accurately reflect the overall twisting degree of the optical fiber on the optical fiber disk.

[0064] 2. The pay-off control mechanism in the present invention controls the pay-off speed of the optical fiber to be tested by detecting the tension of the optical fiber to be tested. The slide bar rotates around the axis of the connecting shaft, and one end of the slide bar connected to the spring forms an elastic end. When the tension of the optical fiber to be tested inserted in the first optical fiber groove changes, the first guide wheel at the other end of the slide bar will rotate downward due to increased pressure or rotate upward due to reduced pressure. Then, by detecting the change in the distance between the distance sensor and the disc cam, the change in the tension of the optical fiber to be tested on the first guide wheel is reflected. Thereby, precise control of the tension of the optical fiber to be tested is achieved.

[0065] 3. The moving mechanism in the present invention is provided with a first slider and a second slider that cooperate with the slide rail, so that the optical fiber pressing and releasing mechanism can be moved to an appropriate position and fixed on the slide rail as needed, and the optical fiber rotation clamping mechanism can perform high-precision linear motion under the drive of the rack and pinion transmission mechanism, thereby improving the stability of the movement of the optical fiber to be tested and reducing the influence of inaccurate measurement caused by the unstable movement of the optical fiber to be tested by the optical fiber twist identification mechanism.

[0066] 4. The present invention cooperates with the pressure wheel through the second guide wheel, and controls the lifting and lowering of the pressure wheel through the pressure-release assembly, so that the optical fiber to be tested can be pressed or released according to the test needs, thereby improving the flexibility of controlling the optical fiber to be tested. At the same time, the second guide wheel and the pressure wheel form a relatively compact structure, which reduces the space of the optical fiber pressure-release mechanism in the test device.

[0067] 5. The present invention provides a fiber rotating clamping mechanism to clamp and rotate the free end of the fiber to be tested to untwist it. At the same time, according to the droop of the free end of the fiber to be tested, the control system controls the fiber rotating clamping mechanism to rotate downward, and then adjusts the axis of the rotating air claw to keep consistent with the droop angle of the free end of the fiber to be tested. When the fiber to be tested is tested, it is in a natural drooping state and is not affected by other external forces as much as possible, thereby improving the accuracy of the measurement of the twist of the fiber to be tested.

[0068] 6. The present invention uses the fiber twist identification mechanism to perform quantifiable detection of the twist direction and twist degree of the optical fiber, thereby reducing the error caused by human judgment. This improves the accuracy of the fiber twist test, so that the measured fiber twist can accurately reflect the overall twist degree of the optical fiber on the optical fiber disk. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 is a stereoscopic diagram of an optical fiber twist test device;

[0070] Figure 2 It is a front view of a device for testing the twist of an optical fiber;

[0071] Figure 3 It is a three-dimensional diagram of the automatic wire-releasing mechanism in the present invention;

[0072] Figure 4 It is a side view of the automatic wire-releasing mechanism of the present invention;

[0073] Figure 5 It is a front view of the line release control mechanism in the present invention;

[0074] Figure 6 It is a three-dimensional diagram of the wire release control mechanism in the present invention;

[0075] Figure 7 A three-dimensional diagram of the mobile mechanism of the present invention;

[0076] Figure 8 A three-dimensional diagram of the optical fiber pressing and releasing mechanism of the present invention;

[0077] Fig. 9 A side view of the optical fiber pressing and releasing mechanism of the present invention;

[0078] Fig.10 A front view of the optical fiber pressing and releasing mechanism of the present invention;

[0079] Fig.11 A schematic diagram of the structure of the optical fiber rotating clamping mechanism in the present invention;

[0080] Fig.12 A three-dimensional diagram of the optical fiber rotation clamping mechanism of the present invention;

[0081] Fig.13 A front view of the optical fiber rotation clamping mechanism of the present invention;

[0082] Fig.14 A schematic diagram of the structure of the optical fiber twist identification mechanism (with some detection holes omitted) in the present invention;

[0083] Fig.15 Flow chart of the optical fiber twisting degree testing method in the present invention;

[0084] The main reference numerals in the figure are as follows:

[0085] 10. test bench; 101. rectangular frame; 102. legs;

[0086] 20. Pay-off control mechanism; 201. Supporting part; 202. Connecting shaft; 203. Disc cam; 204. Sliding rod; 205. Adjusting hole; 206. Spring; 207. First guide wheel; 2071. First optical fiber slot; 208. Distance sensor;

[0087] 30. Automatic pay-off mechanism; 301. Pay-off bracket; 302. First drive device; 303. Reel shaft; 304. Optical fiber reel; 305. Bearing assembly;

[0088] 40. Optical fiber pressing and releasing mechanism; 401. Second guide wheel; 4011. Second optical fiber slot; 402. Pressing wheel; 403. Pressing and releasing assembly; 4031. Mounting part; 4032. Second driving device; 4033. Guide rod;

[0089] 50. Optical fiber twist identification mechanism; 501. Detection board; 5011. Detection hole; 502. Optical fiber position sensor;

[0090] 60. Optical fiber rotating clamping mechanism; 601. Servo motor; 602. Rotating shaft; 603. Air gripper finger; 604. First mounting plate; 605. Second mounting plate; 606. Rotating shaft;

[0091] 70, moving mechanism; 701, slide rail; 702, first slider; 703, second slider; 704, third driving device; 7041, rack; 7042, gear; 7043, moving motor;

[0092] 80. Fiber cutting mechanism; 801. Cylinder body; 802. Clamping finger;

[0093] 90. Optical fiber to be tested. DETAILED DESCRIPTION

[0094] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention.

[0095] Embodiment 1

[0096] Please refer to Figure 1 and Figure 2 As shown, an optical fiber twist test device includes: a test bench 10 and an automatic pay-off mechanism 30, a pay-off control mechanism 20, an optical fiber pressing and releasing mechanism 40, an optical fiber twist identification mechanism 50 and an optical fiber rotation clamping mechanism 60 which are sequentially arranged on the same side of the test bench 10 along the length direction of the test bench 10.

[0097] The optical fiber 90 to be tested is led out from the optical fiber reel 304 and sequentially passes through the pay-out control mechanism 20, the optical fiber pressing and releasing mechanism 40 and the optical fiber rotating clamping mechanism 60. The optical fiber rotating clamping mechanism 60 drives the optical fiber 90 to be tested to move along the length direction of the test bench 10. The naturally drooping optical fiber 90 to be tested passes through the detection area of ​​the optical fiber twisting identification mechanism 50, and the optical fiber detwisting action is performed according to the twisting direction of the optical fiber 90 to be tested detected by the optical fiber twisting identification mechanism 50.

[0098] It should be noted that the function of the test bench 10 in this embodiment is to provide an installation platform for the above-mentioned automatic pay-off mechanism, pay-off control mechanism 20, fiber pressing and releasing mechanism 40, fiber twisting identification structure and fiber rotation clamping mechanism 60. Therefore, the structural form of the test bench 10 is not limited in the embodiment of the present application. Figure 7 The test bench 10 in the illustrated embodiment includes a rectangular frame 101 and legs 102 supported on both sides of the rectangular frame 101 .

[0099] The specific installation positions and specific structures of the above-mentioned other mechanisms will be described in detail below with reference to the test bench 10 .

[0100] 1. Automatic pay-off mechanism 30

[0101] Please refer to Figure 1-Figure 4As shown, in this embodiment, the automatic pay-off mechanism 30 is placed next to the test bench 10, and its purpose is to maintain a certain height difference between the automatic pay-off mechanism 30 and the pay-off control mechanism 20 for the optical fiber 90 to be tested, so that the pay-off control mechanism 20 can accurately control the pay-off speed of the optical fiber 90 to be tested through the tension.

[0102] In this embodiment, the automatic pay-off mechanism 30 includes a pay-off bracket 301 for placing an optical fiber disc 304, a first driving device 302 for driving the optical fiber disc 304 to rotate, and a disc shaft 303 for connecting the pay-off bracket 301 and the optical fiber disc 304. The axis of the disc shaft 303 coincides with the axis of the optical fiber disc 304, so as to improve the stability of the rotation of the optical fiber disc 304. The disc shaft 303 is rotatably arranged on the upper part of the pay-off bracket 301 through a vertical bearing seat assembly, and the output end of the first driving device 302 is connected to one end of the disc shaft 303.

[0103] In order to facilitate the automatic control of the pay-off speed, the first drive device 302 in this embodiment uses a motor as a drive source. The specific first drive device 302 can be a servo motor 601, a DC motor or a stepper motor. Of course, in order to improve the accuracy and stability of the pay-off, and at the same time, when necessary, to provide sufficient torque output and adjustable speed, the above motors can be used in conjunction with a reducer to achieve the above purpose. The working principle of the motor and the principle of use with the reducer belong to the prior art, and this application will not be repeated here.

[0104] 2. Release control mechanism 20

[0105] Please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in this embodiment, the pay-off control mechanism 20 controls the pay-off speed of the optical fiber 90 to be tested by detecting the tension of the optical fiber 90 to be tested.

[0106] Considering that the optical fiber 90 to be tested requires a certain tension force, the pay-off control mechanism 20 in this embodiment has a certain height difference with the automatic pay-off mechanism 30 .

[0107] Specifically, the wire release control mechanism 20 includes: a support portion 201, which is fixedly arranged at one end of the test bench 10, specifically, the upper part of the leg 102 close to the automatic wire release mechanism 30. A mounting hole is provided at one end of the support portion 201 away from the test bench 10, and a connecting shaft 202 is rotatably arranged in the mounting hole, and both ends of the connecting shaft 202 extend out of the mounting holes;

[0108] A disc-shaped cam 203, one side of which is fixedly connected to one end of the connecting shaft 202;

[0109] The slide bar 204 is provided with at least one adjustment hole 205 along the length direction of the slide bar 204, and one end of the connecting shaft 202 away from the disc cam 203 is movably fixed to the adjustment hole 205;

[0110] A spring 206, one end of which is connected to the slide bar 204, and the other end of which is connected to the test bench 10;

[0111] The first guide wheel 207 is rotatably arranged at one end of the slide bar 204 away from the spring 206 and is located on the opposite side of the slide bar 204 from the disc cam 203. The outer peripheral side of the first guide wheel 207 is provided with a first optical fiber groove 2071 for accommodating the optical fiber 90 to be tested;

[0112] The distance sensor 208 is disposed directly below the disc cam 203 and has an installation distance with the disc cam 203 .

[0113] It can be understood that the slide bar 204 rotates around the axis of the connecting shaft 202, and at this time, the end of the slide bar 204 connected to the spring 206 forms an elastic end. When the tension of the optical fiber 90 to be tested inserted into the first optical fiber groove 2071 changes, the first guide wheel 207 at the other end of the slide bar 204 will rotate downward due to increased pressure or rotate upward due to reduced pressure.

[0114] Since the disk cam 203 is connected to the first guide wheel 207 via the connecting shaft 202, when the first guide wheel 207 undergoes the above-mentioned rotational downward pressure or rotational lifting, this rotational downward pressure and rotational lifting is reflected in the disk cam 203 as a counterclockwise rotation or a clockwise rotation (the positioning viewing angle is from the first guide wheel 207 to the disk cam 203).

[0115] In this embodiment, the change in the tension of the optical fiber 90 to be tested on the first guide wheel 207 is reflected by detecting the change in the distance between the distance sensor 208 and the disc cam 203 .

[0116] Specifically, in this embodiment, the distance sensor 208 can be a laser distance sensor 208, which uses the time from the laser being emitted to the laser being reflected to calculate the distance. Since the laser has high directivity and high brightness, a higher measurement accuracy can be achieved. Of course, the present application does not limit the type of the distance sensor 208.

[0117] Generally speaking, the disc cam 203 can be a flat circle or an ellipse, and has a convex profile. In this embodiment, a circular disc cam 203 is used, and the overall structure can be regarded as a circular disc outer circumference along a partial arc smoothly connected to an arc convex.

[0118] When the disc cam 203 rotates around the axis of the connecting shaft 202, the distance between the disc cam 203 and the distance sensor 208 changes.

[0119] Specifically, in this embodiment, when the disk cam 203 rotates clockwise, the distance between the disk cam 203 and the distance sensor 208 becomes larger, indicating that the first guide wheel 207 rotates and lifts, and the pressure applied by the optical fiber 90 to be tested on the first guide wheel 207 becomes smaller, and the tension of the optical fiber 90 to be tested decreases; when the disk cam 203 rotates counterclockwise, the distance between the disk cam 203 and the distance sensor 208 becomes smaller, indicating that the first guide wheel 207 rotates and presses down, and the pressure applied by the optical fiber 90 to be tested on the first guide wheel 207 becomes larger, and the tension of the optical fiber 90 to be tested increases.

[0120] In order to automatically control the pay-off speed of the optical fiber, the first drive device 302, the distance sensor 208, and the second drive device 4032, the third drive device 704 and the servo motor 601 described below are all connected to the control system in this embodiment.

[0121] It can be understood that in this embodiment, the distance between the distance sensor 208 and the disc cam 203 can be set to a certain value or a range. When the distance detected by the distance sensor 208 exceeds this certain value or range, the pay-off speed of the first drive device 302 can be adjusted by the control system to adjust the optical fiber 90 to have a suitable tension.

[0122] It should be noted that the pressure applied to the first guide wheel 207 by different optical fibers 90 to be tested is different. In order to improve the detection sensitivity of the pay-off control mechanism 20, that is, when the tension of the optical fiber 90 to be tested changes significantly, the first guide wheel 207 can be rotated downward or rotated upward significantly. In this embodiment, a spring 206 with a suitable stiffness coefficient can be selected according to the pressure applied by the optical fiber 90 to be tested on the first guide wheel 207, so as to improve the detection sensitivity while ensuring an appropriate amount of deformation. Specifically, when the applied pressure is large, a spring 206 with a large stiffness coefficient is selected, and when the applied pressure is small, a spring 206 with a small stiffness coefficient is selected.

[0123] Please refer to Figure 5 and Figure 6 As shown, the slide rod 204 in this embodiment is provided with a plurality of adjustment holes 205, and its function is to adjust the length of the force arm of the slide rod 204 on both sides of the adjustment hole 205 through different adjustment holes 205, thereby adjusting the rotation lifting or rotation pressing amount of the first guide wheel 207 under the same pressure, thereby adjusting the distance change of the disc cam 203.

[0124] It should be noted that, in this embodiment, the connection shaft 202 and the slide bar 204 can be fixed by providing corresponding through holes on the slide bar 204 and the connection shaft 202, and realizing movable and detachable fixing by means of pins or bolts and nuts that match the through holes.

[0125] 3. Mobile mechanism 70

[0126] Please refer to Figure 7 As shown, in order to facilitate the adjustment of the optical fiber pressing and releasing mechanism 40 and the optical fiber rotating clamping mechanism 60, the optical fiber twisting degree testing device in this embodiment further includes a moving mechanism 70, and the moving mechanism 70 includes:

[0127] The slide rail 701 is fixed on the test bench 10 along the length direction of the test bench 10;

[0128] A first slider 702 is slidably disposed on the slide rail 701, and the optical fiber pressing and releasing mechanism 40 is fixed to the first slider 702;

[0129] The second slider 703 is slidably disposed on the slide rail 701, and the optical fiber rotation clamping mechanism 60 is fixed to the second slider 703;

[0130] The third driving device 704 is used to drive the second slider 703 to slide along the slide rail 701. The third driving device 704 includes a rack 7041 parallel to the slide rail 701 and fixed to the test bench 10, a gear 7042 matched with the rack 7041, and a mobile motor 7043 whose output end is fixed to the gear 7042 for driving the gear 7042 to rotate.

[0131] Specifically, in this embodiment, the slide rail 701 is fixed to one side of the rectangular frame 101. In order to facilitate adjustment of the length of the slide rail 701, the slide rail 701 in this embodiment is a multi-section splicing type. The user can increase or decrease the number of sections of the slide rail 701 as needed to meet the test needs.

[0132] Considering that the optical fiber pressing and releasing mechanism 40 is used as a fixing point of the fixed end of the optical fiber 90 to be tested during the test, it needs to be relatively fixed with the slide rail 701 after the test starts. In this embodiment, a limiting member is provided between the first slider 702 and the slide rail 701. The limiting member can be a bolt or a pin. Similarly, if the second slider 703 needs to be fixed, the above-mentioned fixing method can also be adopted to achieve relative fixation with the slide rail 701.

[0133] Please refer to Figure 7 and Fig.12As shown, the third driving device 704 in this embodiment adopts a matching structure of a rack 7041 and a gear 7042. Specifically, a first mounting plate 604 is fixed on the second slider 703, wherein a moving motor 7043 is fixed to the upper part of the first mounting plate 604, and an output end of the moving motor 7043 passes through the lower part of the first mounting plate 604 and is connected to a gear 7042 at the lower part of the first mounting plate 604. The rack 7041 is fixed at a relative height of the gear 7042, and the tooth portion of the rack 7041 faces the gear 7042. It should be noted that the third driving device 704 can also adopt other types of linear driving mechanisms, such as a screw transmission mechanism, a pneumatic driving mechanism, a hydraulic driving mechanism, and a linear motor.

[0134] The moving mechanism 70 in this embodiment is provided with a first slider 702 and a second slider 703 that cooperate with the slide rail 701, so that the optical fiber pressing and releasing mechanism 40 can be moved to an appropriate position and fixed on the slide rail 701 as needed, and the optical fiber rotating clamping mechanism 60 can perform high-precision linear motion under the drive of the rack 7041 and gear 7042 transmission mechanism, thereby improving the stability of the movement of the optical fiber 90 to be tested and reducing the influence of the optical fiber twisting identification mechanism 50 on inaccurate measurement caused by the unstable movement of the optical fiber 90 to be tested.

[0135] 4. Fiber pressing mechanism 40

[0136] Please refer to Figure 8-Figure 10 As shown, in this embodiment, the optical fiber pressing and releasing mechanism 40 is fixedly disposed on the test bench 10 and is used to fix the optical fiber 90 to be tested to form a fixed end of the optical fiber 90 to be tested.

[0137] The second guide wheel 401 is arranged on the test bench 10. The rotation center axis of the second guide wheel 401 is parallel to the rotation center axis of the first guide wheel 207. The outer peripheral side of the second guide wheel 401 is provided with a second optical fiber groove 4011 for placing the optical fiber 90 to be tested. The second optical fiber groove 4011 and the first optical fiber groove 2071 are located in the same plane;

[0138] The pressing wheel 402 cooperates with the second guide wheel 401 , and when the pressing wheel 402 is pressed into or lifted out of the second optical fiber groove 4011 , the optical fiber 90 to be tested is pressed or released.

[0139] The pressing assembly 403 is used to drive the pressing wheel 402 to press into or lift out of the second optical fiber groove 4011. The pressing assembly 403 includes:

[0140] The mounting portion 4031 is fixed to the test bench 10;

[0141] A second driving device 4032 is fixed to the mounting portion 4031;

[0142] A guide rod 4033, one end of which is fixedly connected to the pressure wheel 402, and the other end of which is connected to the output end of the second driving device 4032;

[0143] The second driving device 4032 drives the guide rod 4033 to extend and retract along its length direction, thereby driving the pressing wheel 402 to press into or lift out of the second optical fiber groove 4011 .

[0144] In this embodiment, the second guide wheel 401 cooperates with the pressure wheel 402, and the lifting and lowering of the pressure wheel 402 is controlled by the pressure-release assembly 403, so that the optical fiber 90 to be tested can be pressed or released according to the test requirements, thereby improving the flexibility of controlling the optical fiber 90 to be tested. At the same time, the second guide wheel 401 and the pressure wheel 402 form a relatively compact structure, which reduces the space of the optical fiber pressure-release mechanism 40 in the test device.

[0145] The first optical fiber groove 2071 and the second optical fiber groove 4011 are located in the same plane, which can ensure that during the laying-out transmission process of the optical fiber 90 to be tested, the path of the optical fiber 90 to be tested is in the same plane, thereby reducing the distortion and offset of the optical fiber 90 to be tested, and to a certain extent, improving the accuracy of the distortion measurement of the optical fiber 90 to be tested.

[0146] It should be noted that, in order to facilitate the installation of the second guide wheel 401 and the pressure-release assembly 403, a mounting portion 4031 is provided in this embodiment. Specifically, the mounting portion 4031 is an L-shaped plate, and the second guide wheel 401 is rotatably fixed to the side of the L-shaped plate away from the slider through a fixed axis.

[0147] Please refer to Figure 8-Figure 10 As shown, the second driving device 4032 can adopt a pneumatic cylinder or a hydraulic cylinder (not shown in the figure). At the same time, the guide rod 4033 adopts a parallel double guide rod 4033, the lower part of the double guide rod 4033 is connected by a fixed plate, the pressure wheel 402 is fixed to the fixed plate by a fixed shaft, and the upper part of the double guide rod 4033 is connected by a connecting plate, and the connecting plate is connected to the output end of the pneumatic cylinder or the hydraulic cylinder.

[0148] It is understandable that the use of the double guide rods 4033 can guide the lifting and lowering of the pressing wheel 402 from two directions, ensuring that the pressing wheel 402 can be smoothly pressed into or lifted out of the second optical fiber groove 4011 in a straight line direction. At the same time, by adjusting the air intake volume, pressure and other parameters of the cylinder, the movement speed and pressure of the pressing wheel 402 can be accurately controlled.

[0149] 5. Fiber cutting mechanism 80

[0150] Please refer to Figure 8-Figure 10 As shown, in order to facilitate automatic cutting of the optical fiber, the optical fiber twist test device in this embodiment further includes an optical fiber cutting mechanism 80 for cutting off the fixed end of the optical fiber 90 to be tested.

[0151] Specifically, the optical fiber cutting mechanism 80 in this embodiment is a parallel opening and closing air gripper. In order to facilitate the installation of the parallel opening and closing air gripper, a suspension plate is vertically connected downwardly to one end of the L-shaped plate close to the optical fiber rotating clamping mechanism 60. Specifically, the parallel opening and closing air gripper includes a cylinder 801 fixed to the suspension plate, two clamping fingers 802 that move in opposite directions or in opposite directions to form an opening and closing action, and a cutting member disposed between the two clamping fingers 802. When the clamping fingers 802 move in opposite directions, the cutting members touch each other and cut the optical fiber 90 to be tested located between the cutting members.

[0152] It is understandable that the cylinder 801 can be a pneumatic cylinder or a hydraulic cylinder. The cutting piece can be made of diamond material, which has the advantages of having a sharp cutting edge, high-precision cutting, ensuring the flatness and smoothness of the cutting surface, and less heat generated during the cutting process, reducing damage to the internal structure of the optical fiber.

[0153] 6. Fiber optic rotating clamping mechanism 60

[0154] Please refer to Figure 11-13 As shown, in this embodiment, the optical fiber rotation clamping mechanism 60 is movably arranged on the test bench 10 along the length direction of the test bench 10. The optical fiber rotation clamping mechanism 60 is used to clamp and rotate the free end of the optical fiber 90 to be tested around its own axis, and is used to perform a back-twisting action on the optical fiber 90 to be tested. The optical fiber rotation clamping mechanism 60 rotates relative to the test bench 10 so that the optical fiber 90 to be tested is in a relatively free hanging state during the test process.

[0155] Specifically, the optical fiber rotation clamping mechanism 60 in this embodiment adopts a rotating air gripper. In order to facilitate the installation of the rotating air gripper, in this embodiment, the first mounting plate 604 is rotatably connected to the second mounting plate 605 at one end close to the optical fiber pressing and releasing mechanism 40 through a rotating shaft 606. Among them, the axis of the rotating shaft 606 of the second mounting plate 605 is parallel to the rotation center line of the first guide wheel 207 or the second guide wheel 401. In order to facilitate the automatic control of the rotation of the second mounting plate 605, the above-mentioned rotating shaft 606 can be connected to a motor, and the rotation of the motor is controlled by a control system, so that the free end of the optical fiber 90 to be measured is colinear with the rotating shaft 606 of the rotating air gripper, thereby ensuring that the optical fiber 90 to be measured is in a natural drooping state during the measurement process.

[0156] In this embodiment, the rotary air gripper comprises a servo motor 601 and a rotating shaft 602 respectively arranged on both sides of a second mounting plate 605, wherein the servo motor 601 is fixed to the second mounting plate 605, and the rotating shaft 602 is connected to the output end of the servo motor 601; a plurality of air gripper fingers 603 are rotatably arranged at one end of the rotating shaft 602 away from the servo motor 601, and the plurality of air gripper fingers 603 are evenly distributed around the central axis of the rotating shaft 602;

[0157] The piston cylinder is connected to the plurality of air gripper fingers 603 , and is used to drive the plurality of air gripper fingers 603 to open or close so as to grasp or release the optical fiber 90 to be tested.

[0158] It should be noted that, in this embodiment, the number of the above-mentioned air gripper fingers 603 is 3. Of course, in actual operation, the number of the air gripper fingers 603 can be selected according to the clamping requirements of the optical fiber 90 to be tested to ensure that the rotating air gripper has a stable clamping effect.

[0159] In addition, in order to improve the firmness of the gripping of the air gripper fingers 603, in this embodiment, the surface of the air gripper fingers 603 in contact with the optical fiber 90 to be tested is treated with special anti-slip treatment, such as adding a coating of a material with high friction such as rubber or silicone. In this way, when clamping the optical fiber, it is possible to better prevent the optical fiber from slipping and improve the clamping stability. For example, a silicone material with high friction performance is selected and attached to the surface of the air gripper fingers 603 by bonding or inlaying. When the air gripper fingers 603 are closed to clamp the optical fiber 90 to be tested, the silicone is in close contact with the surface of the optical fiber 90 to be tested, increasing the friction force, thereby improving the firmness of the gripping of the air gripper fingers 603.

[0160] At the same time, the shape of the air gripper finger 603 can be designed according to the shape of the optical fiber 90 to be tested, so that the air gripper finger 603 can better fit the optical fiber 90 to be tested. For example, the end of the air gripper finger 603 can be set to a concave shape, which can better wrap the optical fiber when closed to prevent it from moving in the radial direction.

[0161] In order to facilitate automatic control, the servo motor 601 and the piston cylinder are connected to a control system. The connection method and control principle belong to the prior art and will not be described in detail in this application.

[0162] 7. Fiber twist identification mechanism 50

[0163] Please refer to Figure 1 , Figure 2 and Fig.14 As shown, in this embodiment, when the optical fiber 90 to be tested is subjected to a twist test, the function of the optical fiber twist identification mechanism 50 is to detect the twist direction of the optical fiber 90 to be tested during the process of the optical fiber 90 to be tested changing from a straightened state to a naturally drooping state, so that the optical fiber rotation clamping mechanism 60 can determine the rotation direction for untwisting.

[0164] In this embodiment, the optical fiber twist identification mechanism 50 includes:

[0165] The detection plate 501 is movably disposed at the lower part of the test bench 10. The detection plate 501 has a plurality of detection holes 5011 in a rectangular array. The plurality of detection holes 5011 form a detection area of ​​the detection plate 501. The naturally drooping optical fiber 90 to be tested is located in the detection area.

[0166] Several groups of optical fiber position sensors 502 are used to determine the optical fiber twisting direction by detecting the vertical distance between the optical fiber 90 to be tested in a naturally drooping state between each group of optical fiber position sensors 502 and the detection plate 501. Several groups of optical fiber position sensors 502 are movably fixed in the detection hole 5011.

[0167] Specifically, in this embodiment, the detection plate 501 is a rectangular plate. The movable detection plate 501 is convenient for timely adjusting the relative position of the detection plate 501 according to the sagging position of the optical fiber 90 to be tested and the moving area, so as to ensure that the optical fiber position sensor 502 can perform full-process detection of the torsion condition of the optical fiber 90 to be tested, thereby ensuring the accuracy of the detection.

[0168] Meanwhile, the layout of the optical fiber position sensor 502 should try to cover the sagging movement path of the optical fiber 90 to be tested. The specific layout of the optical fiber position sensor 502 will be described in detail in the following test method part.

[0169] In order to ensure the stability of the installation of the optical fiber position sensor 502 and improve its measurement accuracy, a limit stop component (not shown in the figure) is provided between the detection hole 5011 and the optical fiber position sensor 502 in this embodiment.

[0170] Specifically, the limit assembly can adopt the following structural forms:

[0171] Positioning structure: A positioning protrusion or groove is provided in the detection hole 5011, which cooperates with the corresponding groove or protrusion on the optical fiber position sensor 502 to achieve more accurate positioning. For example, a circle of small positioning protrusions is provided along the circumferential direction on the inner wall of the detection hole 5011, and a circle of grooves is provided at the corresponding position on the outer shell of the optical fiber position sensor 502. When the optical fiber position sensor 502 is inserted into the detection hole 5011, the protrusions are embedded in the grooves, limiting the rotation and displacement of the optical fiber position sensor 502, thereby improving its fixing stability.

[0172] Elastic fixing structure: An elastic fixing member, such as a spring 206 clip or a rubber pad, is installed in the detection hole 5011. When the optical fiber position sensor 502 is inserted into the detection hole 5011, the elastic fixing member applies a certain pressure to the optical fiber position sensor 502, so that it is tightly fixed in the hole. For example, a rubber pad is used as a fixing member and is pasted on the inner wall of the detection hole 5011. The rubber pad has a certain elastic deformation ability. When the optical fiber position sensor 502 is inserted, the rubber pad is compressed, and the reaction force generated clamps the optical fiber position sensor 502, which can not only ensure the fixing effect, but also prevent damage to the sensor.

[0173] Threaded fixing structure: If the shell structure of the optical fiber position sensor 502 allows, internal threads and external threads can be respectively provided on the detection hole 5011 and the optical fiber position sensor 502, and the sensor can be fixed in the detection hole 5011 through threaded connection. This method is firmly fixed and not easy to loosen, which can significantly improve the stability of the optical fiber position sensor 502.

[0174] In order to ensure that the fiber position sensor 502 extends out of the detection board 501 to the same length after installation, a positioning plate is provided in this embodiment. The positioning plate is parallel to the detection board 501 and is located in front of the detection board 501. The positioning plate can be slidably arranged on the rectangular frame 101 of the test bench 10. When the fiber position sensor 502 is installed, when the fiber position sensor 502 contacts the positioning plate, it means that it is installed in place, and the lengths of several fiber position sensors 502 extending out of the detection board 501 after installation are consistent. In this way, the consistency of the measurement benchmark when several fiber position sensors 502 measure the vertical distance between the optical fiber 90 to be tested and the detection board 501 can be ensured. In particular, when measuring the same group of optical fibers, it can be intuitively judged whether the optical fiber 90 to be tested is close to or far away from the detection board 501, thereby judging the twisting of the optical fiber.

[0175] The optical fiber twist test device in this embodiment is provided with an automatic pay-off mechanism 30, a pay-off control mechanism 20, an optical fiber pressing and releasing mechanism 40, and an optical fiber rotating clamping mechanism 60 on the test bench 10, so that the pay-off, clamping, fixing, and moving of the optical fiber are all mechanically controlled automatically, thereby reducing the error caused by human operation. At the same time, the twist direction and twist degree of the optical fiber are detected by the optical fiber twist identification mechanism 50, further ensuring the accuracy of the optical fiber twist test, so that the measured optical fiber twist degree can accurately reflect the overall twist degree of the optical fiber on the optical fiber disc 304.

[0176] Embodiment 2

[0177] Please refer to Fig.15 As shown, a method for testing the twist of an optical fiber is implemented based on the optical fiber twist testing device of embodiment 1, and comprises the following steps:

[0178] S1, the optical fiber reel 304 is mounted on the pay-off bracket 301, the optical fiber 90 to be tested is passed through the first guide wheel 207 and the second guide wheel 401 in sequence, the first driving device 302 is started, and the untwisted optical fiber on the optical fiber reel 304 is wound off.

[0179] It should be noted that the purpose of winding off the untwisted optical fiber on the optical fiber reel 304 is to remove interference factors. Specifically, since the optical fiber 90 to be tested at the head end of the optical fiber reel 304 is a free end, it may be partially untwisted. This will have a certain impact on the accuracy of the subsequent twist measurement of the optical fiber 90 to be tested.

[0180] S2, start the third drive device 704, move the rotating air claw toward the second guide wheel 401, and after the rotating air claw clamps the free end of the optical fiber 90 to be tested, start the third drive device 704 and the first drive device 302, move the rotating air claw away from the second guide wheel 401 to the set position, and then close the third drive device 704 and the first drive device 302. During the movement, keep the optical fiber 90 to be tested in a horizontally straightened state.

[0181] It should be noted that, generally speaking, the test length of the optical fiber 90 to be tested is 1 meter. In this embodiment, a positioning block that slides relative to the slide rail 701 is provided on the slide rail 701. According to the length of the optical fiber 90 to be tested, the sliding position of the second slider 703 is limited by the positioning block to ensure the consistency of the optical fiber measurement length each time.

[0182] It is understandable that when the measured length of the optical fiber 90 to be measured is inconsistent with the conventional measured length, the relative position of the positioning block on the slide rail 701 can be adjusted accordingly. Obviously, the positioning block can be fixed to the slide rail 701 by means of positioning pins or positioning bolts.

[0183] S3, starting the second driving device 4032, driving the pressing wheel 402 to press downward into the second optical fiber groove 4011 and fix the optical fiber 90 to be tested in the second optical fiber groove 4011.

[0184] It should be noted that the purpose of the pressure wheel 402 and the second optical fiber groove 4011 is to press the second optical fiber tightly into the second optical fiber groove 4011, thereby forming a fixed end of the optical fiber 90 to be tested, ensuring that the fixed end of the optical fiber 90 to be tested will not be twisted during the torsion test, thereby ensuring the accuracy of the twist test of the optical fiber 90 to be tested.

[0185] S4, start the third driving device 704, move the rotating air gripper toward the second guide wheel 401, so that the optical fiber 90 to be tested between the second guide wheel 401 and the rotating air gripper naturally droops, and at the same time, determine the twisting direction of the optical fiber 90 to be tested according to the optical fiber position sensor 502, and start the servo motor 601 to drive the air gripper finger 603 to perform a rotational untwisting action in the opposite direction of the twisting direction of the optical fiber 90 to be tested, until the optical fiber 90 to be tested is completely untwisted; the rotation angle of the servo motor 601 is the twisting degree of the optical fiber 90 to be tested.

[0186] It should be noted that, as described in Example 1, in order to ensure that the optical fiber 90 to be tested is in a natural drooping state during testing and is not affected by other external forces as much as possible, in this embodiment, the rotating shaft 606 is driven by a motor to rotate to drive the second mounting plate 605 to rotate, and then the axis of the rotating air claw is adjusted to be colinear with the free end of the optical fiber 90 to be tested, so that the optical fiber 90 to be tested is in a free drooping state.

[0187] Specifically, the above S4 includes the following steps:

[0188] S41, according to the naturally drooping parabolic path of the optical fiber 90 to be tested, the optical fiber 90 to be tested is divided into a symmetrical first optical fiber segment 90 to be tested and a second optical fiber segment 90 to be tested, with the symmetry axis of the parabola as the symmetry center, the first optical fiber segment 90 to be tested is connected to the rotating air gripper, and the second optical fiber segment 90 to be tested is connected to the pressure wheel 402 and the second guide wheel 401; a plurality of groups of optical fiber position sensors 502 are respectively arranged on the dynamically changing parabolic paths of the first optical fiber segment 90 to be tested and the second optical fiber segment 90 to be tested, so as to measure the twisting degree of the optical fiber 90 to be tested at different time nodes.

[0189] It should be noted that, in this embodiment, each group of optical fiber position sensors 502 includes two optical fiber position sensors 502 disposed in the same height detection hole 5011. The positions of each group of optical fiber position sensors 502 measuring the first optical fiber segment 90 to be tested and the second optical fiber segment 90 to be tested at the same time node are symmetrical with respect to the parabola symmetry axis at this time node.

[0190] S42, based on the change in the vertical distance between the first optical fiber 90 segment to be tested and the second optical fiber 90 segment to be tested and the detection plate 501 detected by the optical fiber position sensor 502, that is, moving away from or approaching the detection plate 501 to determine the twisting direction of the optical fiber 90 to be tested, and driving the air gripper finger 603 through the servo motor 601 to perform a rotational untwisting action opposite to the twisting direction of the optical fiber 90 to be tested.

[0191] Specifically, in this embodiment, the clockwise rotation or twisting direction can be set as the positive direction, and the counterclockwise rotation or twisting direction can be set as the negative direction. The clockwise and counterclockwise observation directions are from the servo motor 601 to the air gripper finger 603, that is, from the top of the air gripper finger 603.

[0192] Generally speaking, when the untwisted optical fibers 90 to be tested are close to each other, the distances between the first section of the optical fiber 90 to be tested and the second section of the optical fiber 90 to be tested and the detection board 501 should remain unchanged. When the optical fiber 90 to be tested is twisted, due to the torsional stress inside the optical fiber, the first section of the optical fiber 90 to be tested and the second section of the optical fiber 90 to be tested are respectively away from (close to) or close to (away from) the detection board 501.

[0193] Specifically, when the optical fiber sensor detects that the first optical fiber 90 segment to be tested is far away from the detection plate 501 and the second optical fiber 90 segment to be tested is close to the detection plate 501, the servo motor 601 drives the air gripper finger 603 to rotate counterclockwise; when the optical fiber sensor detects that the first optical fiber 90 segment to be tested is close to the detection plate 501 and the second optical fiber 90 segment to be tested is far away from the detection plate 501, the servo motor 601 drives the air gripper finger 603 to rotate clockwise.

[0194] S43, when the lowest point of the natural droop of the optical fiber 90 to be tested is parallel to the center line of the detection hole 5011 located at the same height on the detection plate 501; and or, when the optical fiber position sensor 502 detects that the distance between the first section of the optical fiber 90 to be tested and the second section of the optical fiber 90 to be tested and the detection plate 501 remains unchanged, the servo motor 601 is turned off, the rotating air claw stops working, and the detwisting of the optical fiber 90 to be tested is completed.

[0195] S5, start the parallel opening and closing air claws to cut off the optical fiber 90 to be tested;

[0196] S6, repeating the above steps S2-S5, performing multiple back-twist tests, and obtaining the average twist degree of the optical fiber 90 to be tested.

[0197] Specifically, this embodiment assumes that the twisting cycle value of the optical fiber 90 to be tested is n, and is tested 2n times continuously. The twisting degrees from the first to the 2nth time are recorded as D1...D2n respectively, then the twisting degree of the optical fiber 90 to be tested per meter is (D1+D2+...D2n) / 2n.

[0198] The optical fiber twist test method in this embodiment is to measure the optical fiber 90 to be tested by fixing one end and clamping the other end of the optical fiber 90 close to each other under the rotating air gripper, and identify the twist direction of the optical fiber 90 to be tested through multiple groups of optical fiber position sensors 502 on the detection board 501. The rotating air gripper rotates in the direction opposite to the twist direction to detwist the optical fiber 90 to be tested, and then judges that the detwist of the optical fiber 90 to be tested is completed based on whether the lowest point of the natural droop of the optical fiber 90 to be tested is horizontal and / or the vertical distance between the optical fiber 90 to be tested and the detection board 501 remains unchanged. The entire test process of this test method basically realizes automatic control, reduces the detection error and uncertainty that may be caused by human operation, and improves the efficiency and accuracy of the test. At the same time, the twist judgment adopts dynamic multi-point testing, quantifiable detwist completion judgment criteria and multiple measurements to calculate the average value, so that the entire judgment process does not rely on human subjective judgment, improves the accuracy of judgment, and further improves the accuracy of detection.

[0199] It should be noted that the various motors, cylinders, hydraulic cylinders, etc. used for driving in this application are connected to the control system to maximize the automation control of the optical fiber twist test device. The connection method and control principle belong to the prior art and will not be repeated in this application.

[0200] The above is a specific implementation of the embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of this application.

Claims

1. An optical fiber twist test device, characterized in that: include: Test bench (10); A wire release control mechanism (20) is fixedly arranged on the test bench (10) and is used to detect the tension of the optical fiber (90) to be tested; An automatic pay-off mechanism (30) for placing an optical fiber disc (304) and controlling a pay-off speed of the optical fiber disc (304) according to the tension of the optical fiber (90) to be tested; An optical fiber pressing and releasing mechanism (40) is fixedly arranged on the test bench (10), and the optical fiber pressing and releasing mechanism (40) is used to fix the optical fiber (90) to be tested to form a fixed end of the optical fiber (90) to be tested; An optical fiber twist identification mechanism (50) is fixedly arranged on the test bench (10) and is used to detect the twist direction of the optical fiber (90) to be tested; An optical fiber rotating clamping mechanism (60) is arranged on the test bench (10) so as to be movable along the length direction of the test bench (10), the optical fiber rotating clamping mechanism (60) being used for clamping and rotating the free end of the optical fiber (90) to be tested around its own axis, and for performing a back-twisting action on the optical fiber (90) to be tested, the optical fiber rotating clamping mechanism (60) being rotated relative to the test bench (10) so that the optical fiber (90) to be tested is in a relatively free hanging state during the test process; The automatic pay-off mechanism (30), the pay-off control mechanism (20), the optical fiber pressing and releasing mechanism (40), the optical fiber twisting identification mechanism (50) and the optical fiber rotating clamping mechanism (60) are sequentially arranged on the same side of the test bench (10) along the length direction of the test bench (10); The optical fiber (90) to be tested is led out from the optical fiber reel (304) and sequentially passes through the pay-off control mechanism (20), the optical fiber pressing and releasing mechanism (40) and the optical fiber rotating clamping mechanism (60); the optical fiber rotating clamping mechanism (60) drives the optical fiber (90) to be tested to move along the length direction of the test bench (10); the naturally drooping optical fiber (90) to be tested passes through the detection area of ​​the optical fiber twisting identification mechanism (50), and the optical fiber detwisting action is performed according to the twisting direction of the optical fiber (90) to be tested detected by the optical fiber twisting identification mechanism (50).

2. The optical fiber twist test device according to claim 1, characterized in that: The automatic wire-releasing mechanism (30) comprises: A wire-laying support (301) for placing an optical fiber tray (304); A first driving device (302) is fixedly arranged on one side of the pay-off support (301) and is used to drive the optical fiber disk (304) to rotate; The disk shaft (303) has one end connected to the output end of the first driving device (302) and the other end fixedly connected to the optical fiber disk (304). The disk shaft (303) is rotatably arranged on the wire-releasing bracket (301) via a bearing assembly (305).

3. The optical fiber twist test device according to claim 2, characterized in that: The line release control mechanism (20) comprises: A support portion (201) is fixedly arranged at one end of the test bench (10); an end of the support portion (201) away from the test bench (10) is provided with a mounting hole; a connecting shaft (202) is rotatably arranged in the mounting hole; and both ends of the connecting shaft (202) extend out of the mounting hole; A disc-shaped cam (203), one side of which is fixedly connected to one end of the connecting shaft (202); A slide bar (204), at least one adjustment hole (205) being provided along the length direction of the slide bar (204), and one end of the connecting shaft (202) away from the disc cam (203) is movably fixed to the adjustment hole (205); A spring (206), one end of which is connected to the slide bar (204), and the other end of which is connected to the test bench (10); A first guide wheel (207) is rotatably arranged at one end of the slide bar (204) away from the spring (206) and is located on the opposite side of the slide bar (204) from the disc cam (203); a first optical fiber groove (2071) is provided on the outer peripheral side of the first guide wheel (207) for facilitating the placement of the optical fiber (90) to be tested; A distance sensor (208) is disposed directly below the disc-shaped cam (203) and has an installation distance with the disc-shaped cam (203); When the tension of the optical fiber (90) to be tested changes, the first guide wheel (207) is pressed down or lifted up to drive the sliding rod (204) to rotate around the connecting shaft (202), thereby driving the disc cam (203) to rotate, so that the distance between the disc cam (203) and the distance sensor (208) changes, and the automatic pay-off mechanism (30) controls the pay-off speed according to the detection result of the distance sensor (208).

4. The optical fiber twist test device according to claim 3, characterized in that: The optical fiber pressing and releasing mechanism (40) comprises: A second guide wheel (401) is arranged on the test bench (10), the rotation center axis of the second guide wheel (401) is parallel to the rotation center axis of the first guide wheel (207), the outer peripheral side of the second guide wheel (401) is provided with a second optical fiber groove (4011) for facilitating the placement of the optical fiber (90) to be tested, and the second optical fiber groove (4011) and the first optical fiber groove (2071) are located in the same plane; A pressure wheel (402) cooperates with the second guide wheel (401), and when the pressure wheel (402) is pressed into or lifted out of the second optical fiber groove (4011), the optical fiber to be tested (90) is pressed or released; A pressing and releasing assembly (403) is used to drive the pressing wheel (402) to press into or lift out of the second optical fiber groove (4011), and the pressing and releasing assembly (403) comprises: A mounting portion (4031) fixed to the test bench (10); A second driving device (4032) is fixed to the mounting portion (4031); A guide rod (4033), one end of which is fixedly connected to the pressing wheel (402), and the other end of which is connected to the output end of the second driving device (4032); The second driving device (4032) drives the guide rod (4033) to extend and retract along its length direction, thereby driving the pressing wheel (402) to press into or lift out of the second optical fiber groove (4011).

5. The optical fiber twist test device according to claim 4, characterized in that: The optical fiber rotating clamping mechanism (60) is a rotating air claw, and the rotating air claw comprises: Servo motor (601); A rotating shaft (602) connected to an output end of the servo motor (601); A plurality of air gripper fingers (603) are rotatably fixed to one end of the rotating shaft (602) away from the servo motor (601), and the plurality of air gripper fingers (603) are evenly distributed around the central axis of the rotating shaft (602); The piston cylinder is connected to the plurality of the air gripper fingers (603), and the piston cylinder is used to drive the plurality of the air gripper fingers (603) to open or close so as to grasp or release the optical fiber (90) to be tested.

6. The optical fiber twist test device according to claim 5, characterized in that: The optical fiber twist identification mechanism (50) comprises: A detection plate (501) is movably arranged at the lower part of the test bench (10); the detection plate (501) has a plurality of detection holes (5011) in a rectangular array; the plurality of detection holes (5011) form a detection area of ​​the detection plate (501); and the naturally drooping optical fiber (90) to be tested is located in the detection area; A plurality of groups of optical fiber position sensors (502) are used to determine the twisting direction of the optical fiber (90) to be tested by detecting the vertical distance between the optical fiber (90) to be tested in a naturally drooping state between each group of optical fiber position sensors (502) and the detection plate (501), and the plurality of groups of optical fiber position sensors (502) are movably fixed in the detection hole (5011) through a limiting assembly.

7. The optical fiber twist test device according to claim 6, characterized in that: The optical fiber twist test device further comprises a moving mechanism (70), wherein the moving mechanism (70) comprises: A slide rail (701) is fixed on the test bench (10) along the length direction of the test bench (10); A first sliding block (702) is slidably disposed on the sliding rail (701), and the optical fiber pressing and releasing mechanism (40) is fixed to the first sliding block (702); A second slider (703) is slidably disposed on the slide rail (701), and the optical fiber rotation clamping mechanism (60) is fixed to the second slider (703); A third driving device (704) is used to drive the second slider (703) to slide along the slide rail (701), and the third driving device (704) includes a rack (7041) parallel to the slide rail (701) and fixed to the test bench (10), a gear (7042) matched with the rack (7041), and a mobile motor (7043) whose output end is fixed to the gear (7042) and is used to drive the gear (7042) to rotate.

8. The optical fiber twist test device according to claim 7, characterized in that: The optical fiber twist test device also includes an optical fiber cutting mechanism (80) for cutting off the fixed end of the optical fiber (90) to be tested. The optical fiber cutting mechanism (80) is fixed to the side of the mounting portion (4031) close to the optical fiber rotation clamping mechanism (60). The optical fiber cutting mechanism (80) is a parallel opening and closing air claw. The parallel opening and closing air claw includes a cylinder (801) fixed to the mounting portion (4031), two clamping fingers (802) that move in opposite directions or in opposite directions to form an opening and closing action, and a cutting piece arranged between the two clamping fingers (802); when the clamping fingers (802) move in opposite directions, the cutting piece contacts and cuts off the optical fiber (90) to be tested located between the cutting pieces.

9. A method for testing optical fiber twist, implemented based on the optical fiber twist testing device of claim 8, characterized in that: The steps include: S1, installing the optical fiber reel (304) on the pay-off support (301), taking the optical fiber (90) to be tested and passing it through the first guide wheel (207) and the second guide wheel (401) in sequence, starting the first driving device (302), and winding off the untwisted optical fiber on the optical fiber reel (304); S2, starting the third driving device (704), moving the rotating air claw toward the second guide wheel (401), and after the rotating air claw clamps the free end of the optical fiber (90) to be tested, starting the third driving device (704) and the first driving device (302), moving the rotating air claw in a direction away from the second guide wheel (401) to a set position, and then closing the third driving device (704) and the first driving device (302), and keeping the optical fiber (90) to be tested in a horizontal straightened state during the movement; S3, starting the second driving device (4032), driving the pressing wheel (402) to press downward into the second optical fiber groove (4011) and fix the optical fiber (90) to be tested located in the second optical fiber groove (4011); S4, starting the third driving device (704), moving the rotating air claw toward the second guide wheel (401), so that the optical fiber (90) to be tested located between the second guide wheel (401) and the rotating air claw naturally droops, and at the same time, judging the twisting direction of the optical fiber (90) to be tested according to the optical fiber position sensor (502), and starting the servo motor (601), driving the air claw finger (603) to perform a rotational untwisting action in the opposite direction to the twisting direction of the optical fiber (90) to be tested, until the untwisting of the optical fiber (90) to be tested is completed; the rotation angle of the servo motor (601) is the twisting degree of the optical fiber (90) to be tested; S5, start the parallel opening and closing air claws to cut off the optical fiber to be tested (90); S6, repeating the above steps S2-S5, performing multiple back-twist tests, and obtaining the average twist degree of the optical fiber (90) to be tested.

10. The optical fiber twisting degree testing method according to claim 9, characterized in that: The S4 comprises the following steps: S41, according to the naturally sagging parabolic path of the optical fiber (90) to be tested, with the symmetry axis of the parabola as the symmetry center, the optical fiber (90) to be tested is divided into a symmetrical first optical fiber (90) segment to be tested and a second optical fiber (90) segment to be tested, wherein the first optical fiber (90) segment to be tested is connected to a rotating air gripper, and the second optical fiber (90) segment to be tested is connected to a pressure wheel (402) and a second guide wheel (401); a plurality of groups of optical fiber position sensors (502) are respectively arranged on the dynamically changing parabolic paths of the first optical fiber (90) segment to be tested and the second optical fiber (90) segment to be tested, so as to measure the twist of the optical fiber (90) to be tested at different time nodes; S42, according to the change in the vertical distance between the first optical fiber (90) segment to be tested and the second optical fiber (90) segment to be tested and the detection plate (501), i.e., the distance from or approach to the detection plate (501), the twisting direction of the optical fiber (90) to be tested is determined by the optical fiber position sensor (502), and the air gripper finger (603) is driven by the servo motor (601) to perform a rotational untwisting action in the opposite direction to the twisting direction of the optical fiber (90) to be tested; S43, when the lowest point of the natural droop of the optical fiber (90) to be tested is parallel to the center line of the detection hole (5011) located at the same height on the detection plate (501); and / or when the optical fiber position sensor (502) detects that the distance between the first section of the optical fiber (90) to be tested and the second section of the optical fiber (90) to be tested and the detection plate (501) remains unchanged, the servo motor (601) is turned off, the rotating air claw stops working, and the detwisting of the optical fiber (90) to be tested is completed.

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