Fiber performance test method and test device

Abstract

The invention relates to the technical field of fiber fatigue resistance test methods and test devices, and provides a fiber performance test method and test device which comprises a power cabinet, a reel, a plurality of guide wheels, a balancing weight, a triangular clamping block and an operation panel. The reel is arranged on the power cabinet and can wind a plurality of circles of fiber samples, the other end of each fiber sample passes through a plurality of guide wheels, tension is provided at the tail end of each fiber sample through a balancing weight, and one guide wheel can horizontally rotate to twist the fiber samples. The triangular clamping blocks are arranged on the end face of the reel, a fiber channel is reserved between the two triangular clamping blocks, and the tip ends of the triangular clamping blocks are provided with fillets, so that fibers can be bent according to the bending radius. The power cabinet drives the reel to rotate in a reciprocating mode, abrasion resistance verification of mutual friction between fibers and repeated bending resistance verification of the fibers can be achieved respectively, and the problems of fatigue resistance comparison type selection and fatigue resistance quality consistency verification of the fibers for the dynamic optical cable are solved.

Description

Technical Field

[0001] The invention relates to the technical field of a fiber fatigue resistance test method and a test device, and specifically to a fiber performance test method and a test device. Background Art

[0002] Dynamic optical cables are widely used in various ship towing systems, aerostat mooring systems, marine ROV systems, etc. When in use, they will continuously withstand mechanical actions such as bending and winding under certain load conditions, and be repeatedly retracted and released. Therefore, it is required that the strength indicators of the dynamic optical cables be maintained during their life cycle.

[0003] Existing dynamic optical cables integrate a large number of reinforcing fibers through twisting or braiding to improve their strength performance. However, the reinforcing fibers still have the problem of strength reduction due to continuous fatigue damage during use, which may cause major accidents in serious cases. There are two main points: 1. The reinforcing fibers rub against each other during the winding process of the dynamic cable, resulting in a decrease in its strength performance; 2. The fibers are repeatedly bent locally during the winding and bending process of the dynamic cable, resulting in a decrease in its strength performance.

[0004] However, there are many types of fibers and manufacturers in the market. Due to the differences in their own material properties and production quality levels, the wear resistance and bending resistance of the fibers actually vary greatly. In addition, general fiber manufacturers only provide their initial strength performance, so it is impossible to comprehensively evaluate the fatigue resistance of the fiber after it is used in dynamic optoelectronic composite cables, and the material needs to be tested.

[0005] The common fabric wear test and fiber bundle wear test at present is to use grinding wheels or steel to test the wear resistance of fibers. The principle is to use a certain force to make the fabric or fiber bundle contact with the grinding wheel or steel material, and then use the equipment to make them produce mutual friction to test the wear resistance of the fabric or fiber bundle. This kind of fabric or fiber bundle wear test is mainly to verify the mutual wear performance of fibers and other materials such as grinding wheels, steel rods, etc. Since a large number of fibers are integrated in dynamic optical cables, the main cause of fiber wear is the mutual wear between fibers. Therefore, this type of test method cannot meet the needs of dynamic optical cables for fiber wear resistance verification. Summary of the invention

[0006] One of the purposes of the present invention is to propose a fiber performance test method, which solves the problem of fatigue resistance comparison and selection of fibers for dynamic optical cables and fatigue resistance quality consistency verification.

[0007] The technical solution of the present invention is as follows: A fiber performance testing device comprises a power cabinet and an operation panel, wherein the power cabinet is provided with a reel for winding one end of a fiber sample and a driving mechanism for driving the reel to rotate; The guide wheel assembly comprises a guide wheel group and a counterweight block for connecting the other end of the fiber sample. The guide wheel group comprises a plurality of guide wheels for changing the winding direction of the fiber sample.

[0008] Furthermore, the guide wheel group includes guide wheel I, guide wheel II, guide wheel III, and guide wheel IV; The guide wheels I, III and IV are all located at the same level; The guide wheel II is located directly below the plane where the guide wheel I and the guide wheel III are located. The central axis of the guide wheel II is vertically aligned with the center line of the guide wheel I and the guide wheel III, and the guide wheel II can rotate or be fixed in the horizontal direction.

[0009] Furthermore, it comprises two triangular clamps for clamping the fiber sample, the two triangular clamps are closed together by fasteners and installed on the end plane of the reel, and the tips of the two triangular clamps after being closed together are both located at the center of the end plane of the reel.

[0010] Furthermore, the diameters of the guide wheels I, II, III and IV are the same, and a circular groove is provided on the circumferential surface of each guide wheel around its own axis.

[0011] Furthermore, the surface of the reel is provided with a spiral groove, which can be used for winding the fiber sample.

[0012] Furthermore, the tip of the triangular clamp block has a rounded corner.

[0013] Another object of the present invention is to propose A fiber performance test method includes a fiber repeated bending test method and a fiber mutual wear test method.

[0014] Further, the fiber repeated bending test method includes: S110: The fiber sample is clamped by two triangular clamps and fixed together. The tip of the clamped fiber sample should be at the center of the plane at the end of the reel. S120: Leave an appropriate length of the clamped fiber sample at the tip of the triangular clamp block and mount a counterweight block; S130: Leave an appropriate length at the other end of the fiber sample and wind it around the reel for several turns before fixing it; S140: setting the test device parameters so that the reel rotates back and forth continuously at different angles with the tip of the triangular clamp as the center; S150: The fiber is subjected to repeated bending at the tip of the clamp. After a fixed number of bends, the residual strength of different fiber samples is tested to achieve the test effect of repeated bending.

[0015] Further, the test method for mutual wear between fibers includes: S210: Winding one end of the fiber sample on a reel that can reciprocate for several turns, and reserving a length for reciprocating winding; S220: After the other end of the fiber sample passes through guide wheel I, guide wheel II, guide wheel III, and guide wheel IV in sequence, a counterweight block (8) is mounted. Specifically, the other end of the fiber sample passes through the upper side of guide wheel I and is guided to guide wheel II. After passing through the lower side of guide wheel II, it is guided to the upper side of guide wheel III, and then passes through the upper side of guide wheel IV. After circling 1 / 4 of a circle, it is connected to a counterweight block. S230: The guide wheel II is rotated horizontally for several turns and then fixed, so that the fiber samples on both sides of the guide wheel II are twisted above the guide wheel II for a set number of turns; S240: The test is started through the operation panel, and the power cabinet drives the reel to reciprocate, pulling the fiber sample to reciprocate and release, driving the twisted fibers above the guide wheel II to rub against each other; S250: Wear the fiber sample until it breaks and record the number of frictions, or test the remaining strength of different fibers after a fixed number of wears for comparison, to achieve the test effect of limited mutual wear.

[0016] Furthermore, when the fiber sample passes through the guide wheel II, it needs to be twisted a certain number of times above the guide wheel II and fixed.

[0017] The working principle and beneficial effects of the present invention are: The biggest difference between dynamic optical cables and ordinary optical cables in actual use conditions is that they need to be repeatedly retracted and extended under stress and pass through a large number of circular guide wheels. During use, there is a process of continuous bending and straightening, and a large number of fibers will produce tiny mutual slippage, causing repeated mutual wear of the fibers. On the other hand, during the process of retracting and extending the dynamic optical cable, it will be bent when passing through the guide wheel, and the fibers inside will be squeezed and wrinkled. The continuous bending and straightening will cause the fibers to bend repeatedly in specific parts.

[0018] The present invention realizes the verification of the wear resistance of fibers against each other and the verification of the repeated bending resistance of fibers through the fiber fatigue resistance test method and test device, solves the problems of comparative selection of fatigue resistance and verification of quality consistency of fatigue resistance performance of fibers used for dynamic optical cables, and plays an important role in the development of dynamic optical cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 It is a schematic diagram of the structure of the wear test of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention for fatigue resistance; Figure 3 It is a schematic diagram of the triangular clamp block in the present invention.

[0021] In the figure: 1. power cabinet; 2. operation panel; 3. reel; 4. guide wheel I; 5. guide wheel II; 6. guide wheel III; 7. guide wheel IV; 8. counterweight block; 9. triangular clamp block. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1-3 As shown, a fiber performance test device includes a power cabinet 1 and an operation panel 2. The power cabinet 1 is provided with a reel 3 for winding one end of a fiber sample and a driving mechanism for driving the reel 3 to rotate. The driving mechanism includes a motor and a reducer. The motor drives the reducer to link with the reel 3 to realize repeated winding of the reel 3. Then, the operation panel 2 is used to adjust the parameters such as the number of winding turns, winding speed, winding angle, and reciprocating frequency of the reel 3 during the test.

[0025] In this embodiment, the fiber mutual friction test tooling is composed of a guide wheel group and a counterweight block 8 for connecting the other end of the fiber sample.

[0026] Specifically, the guide wheel group includes several guide wheels for changing the winding direction of the fiber sample, that is, the guide wheel group includes four guide wheels, namely, guide wheel I4, guide wheel II5, guide wheel III6, and guide wheel IV7, which can be installed on the frame of the test equipment through a rotating shaft.

[0027] Among them, guide wheel Ⅰ4, guide wheel Ⅲ6, and guide wheel Ⅳ7 are all located at the same horizontal height, and the gravity is converted into a constant pulling force in the horizontal direction through guide wheel Ⅳ7 (the horizontal height is consistent with the reel 3). Guide wheel Ⅱ5 is located directly below the plane where guide wheel Ⅰ4 and guide wheel Ⅲ6 are located. The central axis of guide wheel Ⅱ5 is vertically aligned with the central connection line of guide wheel Ⅰ4 and guide wheel Ⅲ6 (that is, directly below the middle position of guide wheel Ⅰ4 and guide wheel Ⅲ6), and the rotating shaft of guide wheel Ⅱ5 can be installed on another rotating shaft that can rotate in the horizontal direction. When necessary, guide wheel II can be rotated in the horizontal direction or fixed. By switching the state of guide wheel Ⅱ5, a single device can realize the test of two typical friction conditions, and the data is highly comparable.

[0028] The vertical drop from guide wheel Ⅰ4 to guide wheel Ⅱ5 to guide wheel Ⅲ6 causes the fiber sample to form a wrap angle at guide wheel Ⅱ, increasing the contact area; combined with the constant tension of the counterweight block 8, the fiber sample is forced to bear composite stress in the bending friction zone (guide wheel Ⅱ). The bending resistance (repeated bending at guide wheel Ⅱ5) and wear resistance (friction on the surface of guide wheel Ⅱ5) of the fiber sample are simultaneously stimulated, which is closer to the scene of multi-stress coupling in actual use. In addition, an annular groove is opened on the circumferential surface of each guide wheel around its own axis.

[0029] The surface of the reel is provided with a spiral groove, which can be used for winding fiber samples. The spiral groove can ensure that the spacing of each winding of the fiber sample is constant, avoiding overlap or uneven gaps; cooperate with the initial positioning of the guide wheel Ⅰ4, so that the fiber always enters the guide wheel group vertically into the groove to reduce lateral slippage. Make the tension distribution of the fiber sample uniform during the winding process, eliminate the local stress concentration caused by the messy arrangement, and improve the repeatability of the wear resistance test. At the same time, the present embodiment also provides two triangular clamps 9 for clamping the fiber sample. The three components of the two triangular clamps 9, the reel 3, and the counterweight block 8 can form a fiber repeated bending test tooling. The combination of the counterweight block 8, the guide wheel group, and the reel 3 ensures that the fiber sample is controlled in a constant mechanical environment throughout the process. The counterweight block 8 forms a dynamic balance with the rotational resistance of the reel 3. During the start and stop stage of the reel 3, the counterweight block 8 can also buffer the inertial impact and maintain the stability of the tension of the fiber sample; in some long-term tests, the tension attenuation caused by the extension of the fiber sample is avoided, which affects the test results.

[0030] Specifically, two triangular clamps 9 are put together through fasteners (countersunk bolts) and installed on the end plane of the reel 3, and the tips of the two triangular clamps 9 after being put together are both located at the center of the end plane of the reel 3. At the same time, the tips of the two triangular clamps 9 have rounded corners. The design of the centering of the triangular clamps 9, the equal diameter guide wheels, the annular grooves, etc., minimizes the interference of the test variables.

[0031] The diameters of guide wheels Ⅰ4, Ⅱ5, Ⅲ6 and Ⅳ7 are the same, and the specific diameters can be determined according to the test requirements. The diameters of all guide wheels are the same, so that the fiber samples have the same curvature radius when passing through each guide wheel, avoiding additional damage caused by sudden changes in curvature.

[0032] Through the above settings, the device can realize the mutual wear performance test of the fiber and the repeated bending performance test of the fiber. The fatigue resistance test can be carried out on different fibers or different batches of the same fiber, which is helpful for the design and selection of reinforcing fibers for dynamic optical cables, or the fiber quality consistency test can be carried out, effectively improving the fatigue resistance of dynamic optical cables, ensuring their strength performance during their service life, and improving the safety and reliability of the whole system.

[0033] In this embodiment, The specific method of using this embodiment is shown in Example 2.

[0034] Example 2

[0035] This embodiment provides a fiber performance test method, which, based on the first embodiment, also includes a fiber repeated bending test method and a fiber mutual wear test method.

[0036] The repeated bending fatigue test method is as follows: S110: clamping the fiber sample by two triangular clamping blocks 9 and fixing them together, and the tip of the two triangular clamping blocks 9 after being closed together should be at the center of the end plane of the reel 3; The inner diameter of the screw hole on the triangular clamp block 9 should be larger than the outer diameter of the screw to facilitate the fiber sample to be clamped between the triangular clamp blocks.

[0037] After the fiber sample is clamped, the triangular clamp block is closed and then fastened to the end surface of the reel 3 using screws.

[0038] S120: leaving an appropriate length of the clamped fiber sample at the tip of the triangular clamp block, and mounting a counterweight block 8; S130: leaving an appropriate length at the other end of the fiber sample, winding it on the reel 3 for several turns and then fixing it; S140: Setting test device parameters so that the reel 3 rotates back and forth at different angles with the tip of the triangular clamp 9 as the center; S150: The fiber is subjected to repeated bending at the tip of the clamp. After a fixed number of bends, the residual strength of different fiber samples is tested to achieve the test effect of repeated bending.

[0039] The mutual friction fatigue test method is as follows: S210: Winding one end of the fiber sample on a reel 3 that can reciprocate for several turns, and reserving a length for reciprocating winding; S220: After the other end of the fiber sample passes through the guide wheel Ⅰ4, guide wheel Ⅱ5, guide wheel Ⅲ6, and guide wheel Ⅳ7 in sequence, the counterweight block 8 is mounted. That is, the other end of the fiber sample passes through the upper side of the guide wheel Ⅰ4 and is guided to the guide wheel Ⅱ5, passes through the lower side of the guide wheel Ⅱ5, is guided to the upper side of the guide wheel Ⅲ6, and then passes through the upper side of the guide wheel Ⅳ7, and is connected to the counterweight block after a 1 / 4 circle.

[0040] When the fiber sample passes through the guide wheel Ⅱ5, it needs to be twisted a certain number of times above the guide wheel Ⅱ5 and fixed.

[0041] S230: The guide wheel II 5 is rotated horizontally for several turns and then fixed, so that the fiber samples on both sides of the guide wheel II 5 are twisted above the guide wheel II 5 for a set number of turns; S240: The test is started by operating panel 2, and the power cabinet 1 drives the reel 3 to reciprocate, pulling the fiber sample to reciprocate and release, driving the twisted fibers above the guide wheel II 5 to rub against each other; S250: Wear the fiber sample until it breaks and record the number of frictions, or test the remaining strength of different fibers after a fixed number of wears for comparison, to achieve the test effect of limited mutual wear.

[0042] S200: After the test is completed, the qualified and unqualified fiber samples are sent to the next process respectively.

[0043] The repetitive winding power system includes a reel 3, and the parameters such as the number of winding turns, winding speed, winding angle, reciprocating frequency, etc. of the reel 3 can be set through the operation panel 2, which is easy to operate.

[0044] The key to the above test method is as follows: 1. The fibers are twisted together and then mounted with a counterweight 8, and driven by the reel 3 to realize the mutual wear test of the fibers. This method effectively simulates the mutual friction phenomenon of the fibers in the repeated winding of the dynamic optical cable, and realizes the verification of the wear resistance of the fibers. 2. The fiber is clamped by the triangular clamp block 9, and the fiber test point is at the tip of the triangular clamp block 9, and the tip of the triangular clamp block 9 is placed at the center of the end face of the reel 3. The reel 3 is repeatedly rotated at a certain angle to perform repeated bending tests, thereby realizing the verification of the fiber's bending resistance; 3. The fiber fatigue test device includes a set of repeated winding power system, a set of fiber mutual friction test fixture and a set of repeated bending test fixture. Through different combinations, the fiber mutual wear test and the fiber repeated bending test are realized; 4. The top of the triangle clamp 9 is aligned with the center of the end surface of the reel 3 to ensure that the fiber sample is always bent at a fixed curvature radius (equal to the reel radius) when the reel 3 rotates; the stress concentration point of each bend is kept consistent to avoid fluctuations in the bending angle caused by eccentricity and improve the accuracy of counting the number of bends; 5. When the reel 3 reciprocates, the counterweight block 8 forms a closed-loop tension system through the guide wheel group to offset the elastic retraction force that may be generated by the bending of the fiber sample. During the bending process, the fiber sample maintains a constant tension state to prevent bending wrinkles or overload fracture caused by relaxation; 6. The reel 3 can be set to reciprocate by ±90°~±180°, forcing the fiber sample to undergo symmetrical bending (such as U-shaped bending) at the tip of the triangular clamp 9, simulating the repeated folding of the fiber in actual applications (such as the bending joint of the optical cable), and comparing the fatigue cumulative damage of different fiber samples through residual strength testing; 7. The fiber is twisted several times on the guide wheel Ⅱ5 and then fixed to form a spiral contact surface. When the reel 3 is reciprocating, radial sliding and axial rolling composite friction are generated at the twisted part, accurately simulating dynamic scenes (such as mutual scraping of fiber bundles inside the cable); 8. The fiber sample passes through each guide wheel, forming a concentrated friction zone at guide wheel II5. The other guide wheels only change direction to avoid multi-area wear interference and concentrate the friction damage on the twisted section of guide wheel II5, which is convenient for positioning and observing the wear morphology; 9. The gravity of the counterweight block 8 is converted into normal pressure between fibers through the guide wheel IV7. The pressure is linearly related to the wear depth. Different working conditions can be simulated by replacing the counterweight block; 10. The same reel 3 can be switched between repeated bending mode and mutual wear mode through the operation panel. The speed and stroke are automatically adapted. Two types of tests can be completed without changing the tooling, and the efficiency is increased by more than 50%. The following are the test records and test cases of this embodiment, in which 1670dtex aramid fibers produced by different manufacturers were used to perform wear resistance tests on mutual friction between fibers and repeated bending resistance tests on fibers: 1. Wear resistance test of friction between fibers, the fiber twisting number is 3 turns, the weight of the counterweight is 1kg: Four groups of fiber samples were selected for armor testing, and each group of samples was subjected to three wear tests. The test results are as follows:

[0045] Through the above test data, the wear resistance corresponding to different sample groups can be intuitively obtained.

[0046] 2. Test of repeated bending performance of Vinai, repeated rotation angle is ±100°, weight of counterweight is 1kg: Four groups of fiber samples were selected for armor testing. Each group of samples was subjected to three repeated bending tests. The test results are as follows:

[0047] Through the above test data, the bending resistance corresponding to different sample groups can be intuitively obtained.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fiber performance testing device, comprising a power cabinet (1) and an operation panel (2), characterized in that: The power cabinet (1) is provided with a reel (3) for winding one end of the fiber sample and a driving mechanism for driving the reel (3) to rotate; It comprises a guide wheel assembly and a counterweight block (8) for connecting the other end of the fiber sample, wherein the guide wheel assembly comprises a plurality of guide wheels for changing the winding direction of the fiber sample; The surface of the reel (3) is provided with a spiral groove, which can be used for winding the fiber sample.

2. A fiber performance testing device as claimed in claim 1, characterized in that: The guide wheel assembly comprises a guide wheel I (4), a guide wheel II (5), a guide wheel III (6), and a guide wheel IV (7); The guide wheel I (4), guide wheel III (6), and guide wheel IV (7) are all located at the same horizontal height; The guide wheel II (5) is located directly below the plane where the guide wheel I (4) and the guide wheel III (6) are located. The central axis of the guide wheel II (5) is vertically aligned with the center line connecting the guide wheel I (4) and the guide wheel III (6), and the guide wheel II (5) can be rotated or fixed in the horizontal direction.

3. A fiber performance testing device according to claim 2, characterized in that: It comprises two triangular clamping blocks (9) for clamping the fiber sample, the two triangular clamping blocks (9) are closed together by fasteners and installed on the end plane of the reel (3), and the tips of the two triangular clamping blocks (9) after being closed together are both located at the center of the end plane of the reel (3).

4. A fiber performance testing device according to claim 3, characterized in that: The guide wheels I (4), II (5), III (6) and IV (7) have the same diameter, and each guide wheel has an annular groove around its axis on its circumferential surface.

5. A fiber performance testing device according to claim 4, characterized in that: The tip of the triangular clamp block (9) has a rounded corner.

6. A fiber performance testing method, using the fiber performance testing device according to any one of claims 1 to 5 for testing, characterized in that: Including fiber repeated bending test method and fiber mutual wear test method.

7. A fiber performance testing method as claimed in claim 6, characterized in that: The fiber repeated bending test method includes: S110: The fiber sample is clamped by two triangular clamps (9) and fixed together, and the tip of the clamped fiber sample should be located at the center of the end plane of the reel (3); S120: Leave an appropriate length of the clamped fiber sample at the tip of the triangular clamp block and mount a counterweight (8); S130: Leave an appropriate length at the other end of the fiber sample, wind it around the reel (3) for several turns, and then fix it; S140: Setting the test device parameters so that the reel (3) rotates back and forth at different angles with the tip of the triangular clamp (9) as the center; S150: The fiber is subjected to repeated bending at the tip of the clamp. After a fixed number of bends, the residual strength of different fiber samples is tested to achieve the test effect of repeated bending.

8. A fiber performance testing method according to claim 6, characterized in that: The test methods for mutual wear between fibers include: S210: Winding one end of the fiber sample onto a reel (3) that can reciprocate for several turns, and leaving a length for reciprocating winding; S220: After the other end of the fiber sample passes through the guide wheel I (4), the guide wheel II (5), the guide wheel III (6), and the guide wheel IV (7) in sequence, a counterweight block (8) is mounted. Specifically, the other end of the fiber sample passes through the upper side of the guide wheel I (4) and is guided to the guide wheel II (5). After passing through the lower side of the guide wheel II (5), it is guided to the upper side of the guide wheel III (6), and then passes through the upper side of the guide wheel IV (7). After circling 1 / 4 of a circle, it is connected to a counterweight. S230: The guide wheel II (5) is rotated horizontally for several turns and then fixed, so that the fiber samples on both sides of the guide wheel II (5) are twisted above the guide wheel II (5) for a set number of turns; S240: The test is started through the operation panel (2), and the power cabinet (1) drives the reel (3) to reciprocate, pulling the fiber sample to reciprocate and release, driving the twisted fibers above the guide wheel II (5) to rub against each other; S250: Wear the fiber sample until it breaks and record the number of frictions, or test the remaining strength of different fibers after a fixed number of wears for comparison, to achieve the test effect of limited mutual wear.

9. A fiber performance testing method according to claim 8, characterized in that: When the fiber sample passes through the guide wheel II (5), it needs to be twisted a certain number of times above the guide wheel II (5) and fixed.

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