Test device for optical fiber screening strength

Abstract

The present invention relates to the technical field of optical fiber strength testing, and provides an optical fiber screening strength testing device, comprising: an optical fiber screening machine; a first wheel assembly, arranged on a panel of the optical fiber screening machine, an optical fiber wound around the first wheel assembly, and both ends of the optical fiber connected to the optical fiber screening machine; wherein, after the optical fiber is wound around the first wheel assembly, a plurality of bends are formed, so that the bends generate bending stress. The optical fiber screening strength testing device provided by the present invention, by setting the first wheel assembly, forms a plurality of bends when the optical fiber is wound around the first wheel assembly, and each bend generates bending stress, and the bending stress is combined with the tensile stress of the optical fiber screening machine, which can reduce the traction force required by the optical fiber screening machine at the screening strength, so that the optical fiber screening machine with a smaller traction force can also test the screening strength of optical fibers with large core diameters, thereby enhancing the versatility of the optical fiber screening machine.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber strength testing, and in particular to a testing device for optical fiber screening strength. Background Art

[0002] The mainstream optical fiber screening machines on the market are mainly developed and designed for communication thin optical fibers with cladding diameters less than 125um. If they are directly used for the screening strength test of large core diameter special optical fibers, sometimes they cannot meet the screening tension requirements of larger core diameter special optical fibers due to the limitation of the screening machine's pulling force, or because the screening tension required for the screening of large core diameter special optical fibers is too large, if the optical fiber strength is poor during the screening process, the whipping caused by the screening breakage will cause great safety hazards to equipment and personnel. At the same time, in recent years, due to the increasing market share of high-power fiber lasers in the laser field, the demand for large core diameter special optical fibers that high-power fiber lasers rely on has increased day by day, and the screening strength test of large core diameter special optical fibers has become a problem. It is necessary to develop a universal device that is not only suitable for the screening strength test of small core diameter optical fibers, but also can meet the screening strength test of large core diameter special optical fibers. Summary of the invention

[0003] The invention provides a testing device for optical fiber screening strength, which is used to solve the defect that the optical fiber screening machine in the prior art cannot test the screening strength of optical fibers with large core diameters.

[0004] The present invention provides a testing device for optical fiber screening strength, comprising: an optical fiber screening machine; a first wheel body component, which is arranged on a panel of the optical fiber screening machine, and an optical fiber is wound around the first wheel body component, and both ends of the optical fiber are connected to the optical fiber screening machine; wherein, after the optical fiber is wound around the first wheel body component, a plurality of bending portions are formed so that the bending portions generate bending stress.

[0005] According to a testing device for optical fiber screening strength provided by the present invention, the first wheel assembly includes a plurality of curved wheel groups, and the plurality of curved wheel groups are respectively arranged at an angle to the panel.

[0006] According to the optical fiber screening strength testing device provided by the present invention, the plurality of bending wheel sets form a plurality of inclination angles with the panel.

[0007] According to a testing device for optical fiber screening strength provided by the present invention, the inclination angles between the plurality of bending wheel groups and the panel are 0°, 45°, 90°, 135° and 180°.

[0008] According to a testing device for optical fiber screening strength provided by the present invention, a bracket is provided on the panel, and a plurality of bending wheel groups are respectively arranged on both sides of the bracket and connected to the bracket.

[0009] According to a testing device for optical fiber screening strength provided by the present invention, each of the bending wheel sets includes three guide wheels, and the length of the optical fiber wound around one of the guide wheels is greater than half of the circumference of the guide wheel.

[0010] According to a testing device for optical fiber screening strength provided by the present invention, the connecting line of the center points of the three guide wheels is constructed into an isosceles triangle structure.

[0011] The optical fiber screening strength testing device provided by the present invention further includes a second wheel assembly, wherein the second wheel assembly includes a steering wheel set, and the steering wheel set is located below the first wheel assembly.

[0012] According to the optical fiber screening strength testing device provided by the present invention, the second wheel assembly further comprises a pair of dancer guide wheels, and the two dancer guide wheels are symmetrically arranged on both sides of the first wheel assembly.

[0013] According to a testing device for optical fiber screening strength provided by the present invention, the second wheel assembly further includes a pair of traction wheels, the two traction wheels are symmetrically arranged on both sides of the first wheel assembly and located above the dancer guide wheel.

[0014] The optical fiber screening strength testing device provided by the present invention forms a plurality of bends when the optical fiber is wound around the first wheel body assembly by setting a first wheel body assembly. Each bend generates bending stress. The bending stress is combined with the tensile stress of the optical fiber screening machine, which can reduce the traction force required by the optical fiber screening machine at the screening strength. The optical fiber screening machine with smaller traction force can also test the screening strength of optical fibers with large core diameters, thereby enhancing the versatility of the optical fiber screening machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a testing device for optical fiber screening strength provided by the present invention;

[0017] Reference numerals:

[0018] 10: bending wheel set; 11: guide wheel; 20: steering wheel set; 30: traction wheel; 40: dancer guide wheel; 100: panel; 101: bracket; 200: optical fiber. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0020] The features of the terms "first" and "second" in the specification and claims of the present invention may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0021] Combine the following Figure 1 The optical fiber screening strength testing device of the present invention is described.

[0022] like Figure 1 As shown, in one embodiment of the present invention, a testing device for optical fiber screening strength comprises: an optical fiber screening machine and a plurality of first wheel assemblies. The first wheel assembly is arranged on a panel 100 of the optical fiber screening machine, an optical fiber 200 is wound around the first wheel assembly, and both ends of the optical fiber 200 are connected to the optical fiber screening machine. After the optical fiber 200 is wound around the first wheel assembly, a plurality of bends are formed, so that each bend generates bending stress.

[0023] Specifically, in the present embodiment, the first wheel assembly is disposed on the panel 100 of the optical fiber screening machine, one end of the optical fiber 200 is connected to the optical fiber screening machine, and the other end is connected to the optical fiber screening machine after being wound along the first wheel assembly. In the present embodiment, the first wheel assembly includes a plurality of wheel groups, so that the optical fiber 200 forms a plurality of bends after being wound around the wheel groups, and each bend generates bending stress. The bending stress combined with the tensile stress of the optical fiber screening machine can reduce the traction force required by the optical fiber screening machine when the optical fiber 200 reaches the screening strength.

[0024] It should be noted that in this application, screening intensity refers to the preset intensity during the optical fiber strength test. Assuming that the screening intensity of the optical fiber 200 is 100kpsi, each optical fiber 200 is wound on the first wheel assembly, and then both ends of the optical fiber 200 are connected to the optical fiber screening machine. The optical fiber screening machine has a corresponding traction force for the screening intensity of the optical fiber 200. When the optical fiber screening machine applies the corresponding traction force to the optical fiber 200, if the optical fiber 200 is not broken, it means that the strength of the optical fiber 200 meets the screening intensity requirement; otherwise, it means that the strength of the optical fiber 200 does not meet the screening intensity requirement.

[0025] In this embodiment, after the optical fiber 200 is wound on the first wheel assembly, multiple bends are generated, and each bend generates bending stress. The bending stress can reduce the tensile stress of the optical fiber screening machine, so that the optical fiber screening machine can test the screening strength of the optical fiber 200 with a large core diameter under a smaller traction force.

[0026] For example, the bending stress of each bend can be calculated by the following formula:

[0027] δ f =E0*ε f *(1+0.5*α′*ε f ) (4-1)

[0028] ε f =d f / (D+d c ) (4-2)

[0029] α′=0.75α (4-3)

[0030] in:

[0031] δ f —Bending stress caused by winding, GPa;

[0032] E0—Young's modulus, 72Gpa;

[0033] ε f — bending strain caused by winding;

[0034] α′—nonlinear stress / strain characteristic correction factor (typical value is 6);

[0035] d f —Diameter of optical fiber, μm;

[0036] D—diameter of the guide wheel, μm;

[0037] d c —Total diameter of the optical fiber including the coating, μm;

[0038] The first wheel assembly includes a plurality of curved wheel groups 10. Figure 1 As shown, in Figure 1 There are five bending wheel groups 10 in total. The diameter of each guide wheel 11 in each bending wheel group 10 is 133 mm. According to the above formula, the bending stress δ of the bending part can be calculated when the fiber cladding diameter is 400 um, 600 um, 660 um, 800 um, and 880 um. fThey are: 0.2604Gpa, 0.3916a, 0.4311pa, 0.5235pa, 0.5760pa. When the screening intensity is 100kpsi, the corresponding traction force of the optical fiber screening machine is: 53.92N, 84.22N, 88.40N, 83.46N, 69.06N.

[0039] When the optical fiber 200 does not form a plurality of bends and generates bending stress, the pulling force of the optical fiber screening machine can be calculated according to the following formula:

[0040] F=689.5×π×(d f / 2000) 2 (4-4)

[0041] Where:

[0042] F—traction force, N;

[0043] d f —Diameter of optical fiber, μm;

[0044] After calculation, the required traction forces are respectively 86.65 N, 194.95 N, 235.89 N, 346.58 N, and 419.36 N. Comparing the calculation results with the results calculated after using the test device for optical fiber screening strength provided by the embodiment of the present invention, it can be found that when the wheel diameter of the guide wheel 11 is the same, for the same cladding diameter, after using the test device provided by the embodiment of the present invention, the traction force of the optical fiber screening machine is greatly reduced, and as the cladding diameter increases, the required traction force tends to decrease.

[0045] The optical fiber screening strength test device provided by the embodiment of the present invention forms a plurality of bends when the optical fiber is wound around the first wheel assembly by setting a first wheel assembly, and each bend generates bending stress. The bending stress is combined with the tensile stress of the optical fiber screening machine, which can reduce the traction force required by the optical fiber screening machine at the screening strength, so that the optical fiber screening machine with a smaller traction force can also test the screening strength of optical fibers with large core diameters, thereby enhancing the versatility of the optical fiber screening machine. At the same time, after the traction force on the optical fiber screening machine is reduced, when the optical fiber is broken, it will not cause damage to the equipment and personnel, thereby improving the safety of the test device, and also avoiding the misalignment of the optical fiber and the groove bottom of the wheel assembly, which may cause scratches on the coating layer of the optical fiber, thereby effectively protecting the coating layer.

[0046] In one embodiment of the present invention, the first wheel assembly includes a plurality of bending wheel assemblies 10, each bending wheel assembly 10 being arranged at an angle to the panel 100. In this embodiment, the bending wheel assembly 10 serves to bend the optical fiber 200.

[0047] Furthermore, a bracket 101 is provided on the panel 100, and a plurality of bending wheel groups 10 are respectively arranged on both sides of the bracket 101 and connected to the bracket 101. The plurality of bending wheel groups 10 are arranged at an angle with the panel 100, and the inclination angle formed by each bending wheel group 10 and the panel 100 can be the same or different.

[0048] Specifically, multiple bending wheel groups 10 are arranged in sequence downward along the length direction of the bracket 101. When approaching the bottom of the bracket 101, the bending wheel groups 10 are arranged upward along the length direction of the bracket 101, so that the optical fiber 200 is wound around the multiple bending wheel groups 10 to form a detour, thereby shortening the length of the bracket 101.

[0049] When the tilt angles formed by the multiple bending wheel sets 10 and the panel 100 are the same, it is possible to test whether the strength of a certain surface of the optical fiber 200 meets the screening strength. When the tilt angles formed by the bending wheel sets 10 and the panel 100 have multiple angles, it is possible to test whether the strength of multiple surfaces of the optical fiber 200 meets the screening strength.

[0050] In one embodiment of the present invention, the inclination angles of each bending wheel set 10 and the panel 100 are different. Figure 1 As shown, the first bending wheel set 10 has an inclination angle of 0° with respect to the panel 100, the second bending wheel set 10 has an inclination angle of 45° with respect to the panel 100, the third bending wheel set 10 has an inclination angle of 90° with respect to the panel 100, the fourth bending wheel set 10 has an inclination angle of 135° with respect to the panel 100, and the fifth bending wheel set 10 has an inclination angle of 180° with respect to the panel 100. Further, the arrangement order of the bending wheel sets 10 is: on the left side of the bracket 101, from top to bottom, they are: the first bending wheel set 10, the second bending wheel set 10, and the third bending wheel set 10; on the right side of the bracket 101, from bottom to top, they are: the fourth bending wheel set 10 and the fifth bending wheel set 10. In this embodiment, since the inclination angles of each bending wheel set 10 with respect to the panel 100 are different, the strength of multiple surfaces of the optical fiber 200 can be screened for strength testing, thereby improving the accuracy of the screening strength test.

[0051] It should be noted that the number of the bending wheel sets 10 can be freely set, and the inclination angle between each bending wheel set 10 and the panel 100 can also be freely set. For example, the number of the bending wheel sets 10 can be three, and the inclination angles between each bending wheel set 10 and the panel 100 are respectively 30°, 60°, and 120°; or, the number of the bending wheel sets 10 can be four, and the inclination angles between each bending wheel set 10 and the panel 100 are respectively 45°, 90°, 135°, and 180°.

[0052] The optical fiber screening strength testing device provided by the embodiment of the present invention can perform screening strength testing on the strength of multiple surfaces of the optical fiber by setting multiple bending wheel groups at an angle to the panel, thereby improving the accuracy of the test.

[0053] like Figure 1 As shown, in one embodiment of the present invention, each bending wheel set 10 includes three guide wheels 11 , and the length of the optical fiber 200 wound around one of the guide wheels 11 is greater than half of the circumference of the guide wheel 11 .

[0054] Specifically, in this embodiment, the connecting line of the center points of the three guide wheels 11 is configured to form an isosceles triangle structure, wherein the tangent lines of one guide wheel 11 and the other two guide wheels 11 are parallel to each other and perpendicular to the bracket 101. In this arrangement, when the guide wheel 11 rotates, the optical fiber 200 will not interfere with the rotation of the guide wheel 11.

[0055] The length of the optical fiber 200 wound around the guide wheel 11 is greater than half of the circumference of the guide wheel 11 to form a curved portion and generate bending stress. Further, by adjusting the diameter of the guide wheel 11, the bending stress of the curved portion can be adjusted, thereby adjusting the traction force of the optical fiber screening machine, so that the optical fiber screening machine can meet the screening strength test of optical fibers with larger core diameters.

[0056] like Figure 1 As shown, in one embodiment of the present invention, the optical fiber screening strength testing device further includes a second wheel assembly, the second wheel assembly includes a steering wheel assembly 20, and the steering wheel assembly 20 is located below the first wheel assembly.

[0057] Specifically, in this embodiment, the steering wheel group 20 is also connected to the bracket 101, and the steering wheel group 20 is located at the lower part of the bracket 101. The optical fiber 200 is wound around the third bending wheel group 10 and then around the steering wheel group 20, and then around the fourth bending wheel group 10, so that the optical fiber 200 is wound to form a circuitous shape.

[0058] like Figure 1 As shown, in one embodiment of the present invention, the second wheel body assembly further includes a pair of traction wheels 30, and the two traction wheels 30 are symmetrically arranged on both sides of the first wheel body assembly. The traction wheels 30 are used to change the winding direction of the optical fiber 200 so that the optical fiber 200 is wound around the first bending wheel group 10 and the guide wheel 11 of the fifth bending wheel group 10, and at the same time generate traction force on the optical fiber 200.

[0059] Furthermore, the second wheel body assembly also includes a pair of dancer guide wheels 40, which are symmetrically arranged on both sides of the first wheel body assembly and located below the traction wheel 30. The dancer guide wheels 40 are used to adjust the release and reeling tension of the optical fiber 200 during screening, and at the same time reduce the jitter of the optical fiber 200 during screening.

[0060] Specifically, the first end of the optical fiber 200 is connected to the optical fiber screening machine, and the second end of the optical fiber 200 is connected to the optical fiber screening machine after being wound around the first dancer guide wheel 40, the first traction wheel 30, the first bending wheel set 10, the second bending wheel set 10, the third bending wheel set 10, the steering wheel set 20, the fourth bending wheel set 10, the fifth bending wheel set 10, the second traction wheel 30 and the second dancer guide wheel 40 in sequence. When the optical fiber screening machine is started, each wheel structure starts to rotate, and the optical fiber screening machine applies a preset traction force to the optical fiber 200. If the optical fiber 200 is not broken under the action of the traction force, it means that the strength of the optical fiber 200 meets the screening strength requirement. If the optical fiber 200 is broken, it means that the strength of the optical fiber 200 does not meet the screening strength requirement.

[0061] It should be noted that: in the present application, the setting positions of the bending wheel set 10 and the steering wheel set 20 can be flexibly set, as long as the optical fiber 200 can be wound around each wheel body structure and each bending wheel set 10 can form a bending portion.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the optical fiber screening strength, characterized in that: include: Optical fiber screening machines; A first wheel assembly is arranged on a panel of the optical fiber screening machine, an optical fiber is wound around the first wheel assembly, and two ends of the optical fiber are connected to the optical fiber screening machine; Wherein, after the optical fiber is wound around the first wheel assembly, a plurality of curved portions are formed, so that the curved portions generate bending stress; The first wheel assembly includes a plurality of curved wheel groups, each of which is arranged at an angle to the panel, and each of the curved wheel groups forms a plurality of inclination angles with the panel; Each of the bending wheel sets includes three guide wheels, the length of the optical fiber wound around one of the guide wheels is greater than half of the circumference of the guide wheel, and the line connecting the center points of the three guide wheels forms an isosceles triangle structure.

2. The optical fiber screening strength testing device according to claim 1, characterized in that: The inclination angles of the plurality of curved wheel sets and the panel are 0°, 45°, 90°, 135° and 180°.

3. The optical fiber screening strength testing device according to claim 1, characterized in that: A bracket is provided on the panel, and the plurality of bending wheel groups are respectively arranged on both sides of the bracket and connected to the bracket.

4. The optical fiber screening strength testing device according to claim 1, characterized in that: It also includes a second wheel body assembly, which includes a steering wheel set, and the steering wheel set is located below the first wheel body assembly.

5. The optical fiber screening strength testing device according to claim 4, characterized in that: The second wheel assembly further comprises a pair of dancer guide wheels, and the two dancer guide wheels are symmetrically arranged on both sides of the first wheel assembly.

6. The optical fiber screening strength testing device according to claim 5, characterized in that: The second wheel assembly also includes a pair of traction wheels, and the two traction wheels are symmetrically arranged on both sides of the first wheel assembly and located above the dancer guide wheel.

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