Optical fiber bending strength detection device

Abstract

The invention discloses an optical fiber bending strength detection device, and relates to the technical field of optical fiber curvature detection, the optical fiber bending strength detection device comprises a main body, a fixing frame is fixed in the middle of the inner side of the main body, and two reducing bending wheel mechanisms are movably connected to the two ends of the top of the fixing frame; and the inner side of the main body is movably connected with a bending swing arm positioned above the two groups of variable-diameter bending wheel mechanisms. When different bending degrees of an optical fiber need to be detected, under the acting force of external hydraulic oil, multiple groups of adjusting rings of each group of variable-diameter bending wheel mechanism radially extend out relative to a fixed cylinder, and then the four groups of extending adjusting rings jointly form bending wheels with different diameters; the distance between the two sets of variable-diameter bending wheel mechanisms is synchronously adjusted, the problem that the variable-diameter adjusting rings interfere with each other is avoided, the overall using effect is good, and the requirement for detecting the performance of the optical fiber under different bending degrees is well met.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber bending detection, in particular to an optical fiber bending strength detection device. Background Art

[0002] Fiber optic bend detection technology is an important means to evaluate the performance changes of optical fibers when they are bent. It plays a key role in the fields of fiber optic communications and fiber optic sensing. The optical power monitoring method determines the impact of bending on the performance of optical fibers by measuring the changes in optical power transmitted by the optical fiber before and after bending. For example, in a fiber optic communication system, when the optical fiber is bent, the optical power may be attenuated, and this change can be detected by a precise optical power meter.

[0003] In fields such as fiber-optic communication and fiber-optic sensing, the bending performance of optical fiber has an important impact on its transmission characteristics and reliability. Therefore, it is crucial to accurately detect the performance changes of optical fiber under different bending degrees. The optical fiber bending detection equipment currently available on the market usually uses a bending wheel with a fixed diameter to achieve the bending of the optical fiber.

[0004] Since the diameter of the bending wheel cannot be adjusted, it can only provide a single fixed curvature, which cannot meet the needs of testing the performance of optical fibers under different curvatures. For example, in some application scenarios, it is necessary to study the loss characteristics of optical fibers under small curvatures, while in other scenarios, it is necessary to focus on the fatigue resistance of optical fibers under large curvatures. However, existing equipment cannot flexibly simulate these different bending conditions. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an optical fiber bending strength detection device to solve the technical problem in the prior art that the diameter of the bending wheel cannot be adjusted and can only provide a single fixed curvature, which cannot meet the detection requirements of optical fiber performance under different curvatures.

[0006] To achieve the above object, the present invention provides the following technical solution: an optical fiber bending strength testing device, comprising a main body, a fixing frame fixed at the middle position inside the main body, two sets of variable diameter bending wheel mechanisms movably connected at both ends of the top of the fixing frame, and a bending swing arm located above the two sets of variable diameter bending wheel mechanisms movably connected inside the main body; The variable diameter bending wheel mechanism includes a support frame, a spacing adjustment frame, a fixed cylinder, a cross cylinder, a telescopic rod and an adjusting ring. The support frame is fixed to the top of the fixed frame, and both ends of the inner side of the fixed frame are slidably connected with the spacing adjustment frame, and each set of spacing adjustment frames is provided with a fixed cylinder inside, and the two sets of fixed cylinders are provided with a cross cylinder inside, and the two sets of cross cylinders are slidably connected with a telescopic rod that penetrates the fixed cylinder, and the adjusting ring is fixed to the end of the telescopic rod; The variable diameter bending wheel mechanism also includes a liquid inlet pipe, a connecting ring and a liquid outlet pipe. The inner side of the fixed cylinder is fixed with a liquid inlet pipe extending to the inside of the cross cylinder. The one side of the fixed cylinder is fixed with a connecting ring located outside the liquid inlet pipe. The four corners of the cross cylinder are connected to the connecting ring. The variable diameter bending wheel mechanism also includes a fixed sealing block, a connecting ring, a connecting pipe and a connecting pipe. The spacing adjustment frame and the fixed cylinder are fixedly connected by the connecting ring. Both ends of the support frame are fixed with a fixed sealing block located inside the spacing adjustment frame, and a cavity matching with the fixed sealing block is opened inside the spacing adjustment frame. The connecting ring and the cavity in the spacing adjustment frame are connected to each other through the connecting pipe. A locking mechanism is slidably connected inside the bending swing arm, and the locking mechanism includes a lifting frame, a screw rod, a slide plate, a push plate, a clamping block and an inclined block. The slide plate is located inside the lifting frame and slides and is threadedly connected to the screw rod, and the push plate is located inside the lifting frame and slides and is fixedly connected to the slide plate. Two groups of clamping blocks are located at one end of the lifting frame and are radially slidably connected thereto. One end of the two groups of clamping blocks and one end of the push plate are fixed with inclined blocks with mutually matched inclined surfaces. The locking mechanism also includes a sliding rod, a gear, a rack and an extrusion ring. The lifting frame and the bending swing arm are slidably connected through the sliding rod. A gear is fixed to the outside of the screw rod. The top and bottom of the gear are meshed with racks, and the ends of the two sets of racks are fixed with extrusion rings slidably connected with the two sets of sliding rods. The locking mechanism also includes a positioning ring, a handle, a positioning rod and a spring. The positioning ring is fixed to one end of the lifting frame, the handle is fixed to the end of the screw rod, and positioning rods corresponding to the positioning ring are fixed on both sides of the inner end surface of the handle. A spring is fixed between the handle and the screw rod; A counterweight mechanism is movably connected to the bottom of the main body, and the counterweight mechanism includes a counterweight arm, an adjusting rod, a counterweight splint, a sliding ring and a sliding rod. Two groups of the sliding rods are fixed inside the main body and are slidably connected to the two groups of sliding rings. The counterweight arm is fixed to the sliding ring and extends to the outside of the main body. The two groups of adjusting rods are fixed to the ends of the counterweight arms, and the inner ends of the adjusting rods are fixed with counterweight splints. The counterweight mechanism also includes an electromagnet, a control power supply module and a spiral wire. The two groups of electromagnets are fixed to the tops of the two groups of sliding rings and are located outside the sliding rod. The control power supply module is installed inside the main body, and the control power supply module and the two groups of electromagnets are electrically connected through a spiral wire.

[0007] By adopting the above technical solution, the optical fiber that needs to be tested for curvature is placed between two groups of variable diameter bending wheel mechanisms, and the two ends of the optical fiber are fixedly connected to the locking mechanism and the counterweight mechanism respectively. At this time, the bending swing arm drives the optical fiber through the locking mechanism to make it swing back and forth along the two groups of variable diameter bending wheel mechanisms for bending test. When it is necessary to test the optical fiber with different curvatures, under the action of external hydraulic oil, the multiple adjustment rings of each group of variable diameter bending wheel mechanisms are radially extended relative to the fixed cylinder, and then the four groups of extended adjustment rings together form bending wheels with different diameters, so that the optical fiber can be tested for different curvatures along the adjustment rings. At the same time, when the adjustment rings are adjusted, the optical fiber can be tested for different curvatures. After the node ring is radially extended, the hydraulic oil inside the cross cylinder enters the connecting ring through multiple sets of liquid outlet pipes, and then enters the spacing adjustment frame through the connecting pipe. Since the spacing adjustment frame and the support frame are slidingly connected through a fixed sealing block, when the hydraulic oil enters the spacing adjustment frame, the spacing adjustment frame can drive the fixed cylinder as a whole to slide relative to the support frame under the action of the hydraulic oil. In other words, when the two sets of variable diameter bending wheel mechanisms change their diameters, the spacing between the two sets of variable diameter bending wheel mechanisms is adjusted synchronously, which will not cause the problem of mutual interference between the adjustment rings after the diameter change. The overall use effect is good, which well meets the detection requirements of optical fiber performance under different curvatures.

[0008] Furthermore, an optical power meter is fixed on the top of the locking mechanism, and a light source module matching with the optical power meter is slidably connected to the bottom of the inner side of the fixing frame.

[0009] By adopting the above technical solution, the optical power meter and the light source module are plugged and fixed to the two ends of the optical fiber. At this time, the light source module is energized to generate a light beam, and the light beam passes through the optical fiber and can be received by the optical power meter. The optical power meter and external computing equipment are used to calculate the curvature data of the optical fiber at a bending angle.

[0010] Furthermore, the bending swing arm and the main body are rotationally connected via a rotating shaft, a limiting ring is fixed on the inner side of the main body, and a limiting rod extending to the inside of the limiting ring is fixed on the inner side of the bending swing arm.

[0011] By adopting the above technical solution, the cooperation between the limit ring and the limit rod makes the bending swing arm more stable during the reciprocating swing process, thereby improving the overall stability.

[0012] In summary, the present invention mainly has the following beneficial effects: 1. The present invention places the optical fiber that needs to be tested for curvature between two groups of variable-diameter bending wheel mechanisms, and the two ends of the optical fiber are fixedly connected to the locking mechanism and the counterweight mechanism respectively. At this time, the bending swing arm drives the optical fiber through the locking mechanism to make it swing back and forth along the two groups of variable-diameter bending wheel mechanisms for bending test. When it is necessary to test the optical fiber with different curvatures, under the action of external hydraulic oil, multiple groups of adjustment rings of each group of variable-diameter bending wheel mechanisms are radially extended relative to the fixed cylinder, and then the four groups of extended adjustment rings together form bending wheels with different diameters, so that the optical fiber can be tested for different curvatures along the adjustment rings. At the same time, when the diameter of the adjustment ring is adjusted, the adjustment ring is adjusted to the desired curvature. After extending, the hydraulic oil inside the cross cylinder enters the connecting ring through multiple groups of liquid outlet pipes, and then enters the spacing adjustment frame through the connecting pipe. Since the spacing adjustment frame and the support frame are slidably connected through the fixed sealing block, when the hydraulic oil enters the spacing adjustment frame, the spacing adjustment frame can drive the fixed cylinder as a whole to slide relative to the support frame under the action of the hydraulic oil. That is to say, when the two groups of variable diameter bending wheel mechanisms change their diameters, the spacing between the two groups of variable diameter bending wheel mechanisms is synchronously adjusted, which will not cause the problem of mutual interference between the adjustment rings after the diameter change. The overall use effect is good, which well meets the detection requirements of optical fiber performance under different curvatures. 2. The locking mechanism of the present invention plays a role in fixing and clamping one end of the optical fiber. Before clamping, one end of the optical fiber is placed between the two groups of clamping blocks, and the handle is manually pulled. At this time, the spring is in an extended state, and then the handle is turned to drive the screw to rotate, and then the rotation of the screw drives the slide plate to move axially, thereby driving the push plate and the inclined block to make the two groups of clamping blocks move radially to clamp and fix one end of the optical fiber. When the handle is turned, the gears synchronously drive the two groups of racks to move, so that the two groups of racks drive the two groups of extrusion rings to squeeze and fix the outer side of the bending swing arm along the sliding rod. After fixing, the state after the handle is rotated at an angle is maintained, and then the two groups of positioning rods are inserted into the corresponding positioning holes inside the positioning ring, thereby playing a role in positioning and fixing the handle. That is to say, the locking mechanism can adjust the height relative to the bending swing arm. After adjustment, the locking mechanism and the bending swing arm can be fixedly connected, and the optical fiber can be clamped and fixed, thereby facilitating subsequent optical fiber curvature detection, greatly improving the overall convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the present invention; Figure 3 It is an enlarged structural schematic diagram of the variable diameter bending wheel mechanism of the present invention; Figure 4 It is an enlarged partial cutaway view of the variable diameter bending wheel mechanism of the present invention; Figure 5 For the present invention Figure 4 A magnified image of point A; Figure 6 It is a partial enlarged structural schematic diagram of the present invention; Figure 7 It is a partially enlarged cross-sectional view of the present invention; Figure 8 It is an enlarged structural schematic diagram of the spacing adjustment frame of the present invention; Fig. 9 It is an enlarged structural schematic diagram of the locking mechanism of the present invention; Fig.10 is an enlarged exploded view of the locking mechanism of the present invention; Fig.11 It is an enlarged structural schematic diagram of the counterweight mechanism of the present invention; Fig.12 It is a partial structural exploded view of the present invention.

[0014] In the figure: 1, main body; 2, fixed frame; 3, variable diameter bending wheel mechanism; 301, support frame; 302, spacing adjustment frame; 303, fixed sealing block; 304, connecting ring; 305, fixed cylinder; 306, cross cylinder; 307, telescopic rod; 308, adjustment ring; 309, liquid inlet pipe; 310, connecting ring; 311, liquid outlet pipe; 312, connecting pipe; 313, connecting pipe; 4, bending swing arm; 5, locking mechanism; 501, lifting frame; 502, screw rod; 503, slide plate; 504, push plate; 505, Clamping block; 506, inclined block; 507, sliding rod; 508, gear; 509, rack; 510, extrusion ring; 511, positioning ring; 512, handle; 513, positioning rod; 514, spring; 6, counterweight mechanism; 601, counterweight arm; 602, adjustment rod; 603, counterweight clamp; 604, sliding ring; 605, sliding rod; 606, electromagnet; 607, control power supply module; 608, spiral wire; 7, optical power meter; 8, rotating shaft; 9, limit rod; 10, limit ring; 11, light source module. DETAILED DESCRIPTION

[0015] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0016] The following describes an embodiment of the present invention based on its overall structure.

[0017] An optical fiber bending strength testing device, such as Figure 1-12As shown, it comprises a main body 1, a fixing frame 2 is fixed at the middle position inside the main body 1, two sets of variable diameter bending wheel mechanisms 3 are movably connected at both ends of the top of the fixing frame 2, and a bending swing arm 4 located above the two sets of variable diameter bending wheel mechanisms 3 is movably connected inside the main body 1; The variable diameter bending wheel mechanism 3 includes a support frame 301, a spacing adjustment frame 302, a fixed cylinder 305, a cross cylinder 306, a telescopic rod 307 and an adjusting ring 308. The support frame 301 is fixed to the top of the fixed frame 2. Both ends of the inner side of the fixed frame 2 are slidably connected with the spacing adjustment frame 302, and the inner side of each set of spacing adjustment frames 302 is provided with a fixed cylinder 305, and the two sets of fixed cylinders 305 are provided with a cross cylinder 306 inside. The two sets of cross cylinders 306 are slidably connected with the telescopic rod 307 that penetrates the fixed cylinder 305, and the adjusting ring 308 is fixed to the end of the telescopic rod 307; The variable diameter bending wheel mechanism 3 also includes a liquid inlet pipe 309, a connecting ring 310 and a liquid outlet pipe 311. The inner side of the fixed cylinder 305 is fixed with a liquid inlet pipe 309 extending to the inside of the cross cylinder 306. The one side of the fixed cylinder 305 is fixed with a connecting ring 310 located outside the liquid inlet pipe 309. The four corners of the cross cylinder 306 are connected to the connecting ring 310. The variable diameter bending wheel mechanism 3 also includes a fixed sealing block 303, a connecting ring 304, a connecting pipe 312 and a connecting pipe 313, wherein the end of the connecting pipe 313 extends into the interior of the main body 1 and is interconnected with the hydraulic pump inside the main body 1, and then under the action of the hydraulic pump, hydraulic oil can be pumped into the interior of the connecting pipe 313; The spacing adjustment frame 302 and the fixed cylinder 305 are fixedly connected by a connecting ring 304. The two ends of the support frame 301 are fixed with fixed sealing blocks 303 located inside the spacing adjustment frame 302. A cavity matching with the fixed sealing block 303 is opened inside the spacing adjustment frame 302. The connecting ring 310 and the cavity inside the spacing adjustment frame 302 are connected to each other through a connecting pipe 312. At this time, under the force of external hydraulic oil, the multiple groups of adjusting rings 308 of each group of variable diameter bending wheel mechanism 3 are radially extended relative to the fixed cylinder 305, and then the four groups of extended adjusting rings 308 together form bending wheels of different diameters, so that the optical fiber can be tested along the adjusting rings 308 with different bending degrees; The locking mechanism 5 is slidably connected inside the bending swing arm 4, and the locking mechanism 5 includes a lifting frame 501, a screw rod 502, a slide plate 503, a push plate 504, a clamping block 505 and an inclined block 506. The slide plate 503 is located inside the lifting frame 501 and slides and is threadedly connected to the screw rod 502, and the push plate 504 is located inside the lifting frame 501 and slides and is fixedly connected to the slide plate 503. Two groups of clamping blocks 505 are located at one end of the lifting frame 501 and are radially slidably connected thereto. One end of the two groups of clamping blocks 505 and one end of the push plate 504 are fixed with inclined blocks 506 with mutually matched inclined surfaces. The locking mechanism 5 further includes a sliding rod 507, a gear 508, a rack 509, a pressing ring 510, a positioning ring 511, a handle 512, a positioning rod 513 and a spring 514; The lifting frame 501 and the bending swing arm 4 are slidably connected via a sliding rod 507, a gear 508 is fixed on the outside of the screw rod 502, the top and bottom of the gear 508 are meshed with racks 509, and the ends of the two sets of racks 509 are fixed with extrusion rings 510 slidably connected with the two sets of sliding rods 507, a positioning ring 511 is fixed at one end of the lifting frame 501, and a handle 512 is fixed at the end of the screw rod 502; Positioning rods 513 corresponding to the positioning ring 511 are fixed on both sides of the inner end surface of the handle 512, wherein the positioning rods 513 and the positioning ring 511 cooperate with each other, and two sets of positioning rods 513 are inserted into the corresponding positioning holes inside the positioning ring 511, thereby playing a role in positioning and fixing the handle 512; A spring 514 is fixed between the handle 512 and the screw rod 502, wherein the spring 514 keeps the handle 512 in a stable state to prevent the handle 512 from axial displacement during operation; The bottom of the main body 1 is movably connected with a counterweight mechanism 6, which includes a counterweight arm 601, an adjustment rod 602, a counterweight clamping plate 603, a sliding ring 604, a sliding rod 605, an electromagnet 606, a control power supply module 607 and a spiral wire 608; Two sets of sliding rods 605 are fixed inside the main body 1 and are slidably connected with the two sets of sliding rings 604. The counterweight arm 601 is fixed on the sliding ring 604 and extends to the outside of the main body 1. Two sets of adjusting rods 602 are fixed on the ends of the counterweight arms 601, and the inner ends of the adjusting rods 602 are all fixed with counterweight clamping plates 603. Two sets of electromagnets 606 are fixed on the tops of the two sets of sliding rings 604 and are located on the outside of the sliding rods 605. The control power supply module 607 is installed inside the main body 1, and the control power supply module 607 and the two sets of electromagnets 606 are electrically connected through a spiral wire 608, wherein the spiral wire 608 will not affect the lifting process of the counterweight mechanism 6 during the bending process of the optical fiber, avoiding interference.

[0018] See also Figure 1 The locking mechanism 5 is fixed with an optical power meter 7 on the top, and the bottom inner side of the fixing frame 2 is slidably connected with a light source module 11 that matches the optical power meter 7. The present invention sets the above structure, wherein the optical power meter 7 and the light source module 11 are plugged and fixed to each other at both ends of the optical fiber. At this time, the light source module 11 is energized to generate a light beam, wherein the light beam passes through the optical fiber and can be received by the optical power meter 7. The data of the curvature of the optical fiber at a bending angle state is calculated by the optical power meter 7 and in cooperation with an external computing device.

[0019] See also Figure 2 and Fig.12 The bending swing arm 4 and the main body 1 are rotatably connected via a rotating shaft 8, a limiting ring 10 is fixed on the inner side of the main body 1, and a limiting rod 9 extending to the inside of the limiting ring 10 is fixed on the inner side of the bending swing arm 4. By setting the above structure, the cooperation of the limiting ring 10 and the limiting rod 9 makes the bending swing arm 4 more stable during the reciprocating swing process, thereby improving the overall stability.

[0020] The working principle of the present invention is as follows: when in use, the power is turned on, and the optical fiber to be tested for curvature is placed between two sets of variable diameter bending wheel mechanisms 3, and the two ends of the optical fiber are fixedly connected to the locking mechanism 5 and the counterweight mechanism 6 respectively; Furthermore, an optical power meter 7 and a light source module 11 are respectively arranged at the top of the locking mechanism 5 and below the counterweight mechanism 6, wherein the optical power meter 7 and the light source module 11 are plugged and fixed to the two ends of the optical fiber, and at this time, the light source module 11 is energized to generate a light beam, wherein the light beam passes through the optical fiber and can be received by the optical power meter 7; At this time, the bending swing arm 4 drives the optical fiber through the locking mechanism 5 to make it perform a reciprocating swing bending test along the two sets of variable diameter bending wheel mechanisms 3. According to different types of optical fibers, the number of reciprocating swings, the angle of the reciprocating swings and the time of the reciprocating swings are set. Finally, the curvature data of the optical fiber at a bending angle state is calculated by the optical power meter 7 and the external computing equipment. Specifically, a driving mechanism is disposed inside the main body 1, wherein the driving mechanism may be a motor or other reciprocating driving mechanism, and then the bending swing arm 4 may be driven to perform a reciprocating swing operation through the rotating shaft 8, wherein the reciprocating swing angle range of the bending swing arm 4 is between negative 120° and positive 120°; When it is necessary to test the optical fiber with different curvatures, it is necessary to adaptively adjust the distance between the locking mechanism 5 and the variable diameter bending wheel mechanism 3. At this time, the staff manually adjusts the locking mechanism 5. Specifically, the locking mechanism 5 plays a role in fixing and clamping one end of the optical fiber. Before clamping, one end of the optical fiber is placed between the two groups of clamping blocks 505, and the handle 512 is manually pulled. At this time, the spring 514 is in an extended state, and then the handle 512 is turned to drive the screw rod 502 to rotate, and then the screw rod 502 rotates to drive the slide plate 503 to move axially, thereby driving the push plate 504 and the inclined block 506 to make the two groups of clamping blocks 505 move radially to clamp and fix one end of the optical fiber; When the handle 512 is turned, the gear 508 synchronously drives the two sets of racks 509 to move, so that the two sets of racks 509 drive the two sets of extrusion rings 510 to squeeze and fix the outer side of the bending swing arm 4 along the sliding rod 507; After being fixed, the handle 512 is manually kept in the state after being rotated at an angle, and then the two sets of positioning rods 513 are inserted into the corresponding positioning holes inside the positioning ring 511, thereby playing a role in positioning and fixing the handle 512; That is to say, the locking mechanism 5 can be adjusted in height relative to the bending swing arm 4 to adapt to the bending detection of bending wheels with different radii. After adjustment, the locking mechanism 5 and the bending swing arm 4 can be fixedly connected, and the optical fiber can be clamped and fixed, so as to facilitate the subsequent optical fiber bending detection, which greatly improves the overall convenience. After the locking mechanism 5 is adjusted, under the force of external hydraulic oil, the multiple adjustment rings 308 of each group of variable diameter bending wheel mechanism 3 are radially extended relative to the fixed cylinder 305, and then the four extended adjustment rings 308 together form bending wheels of different diameters, so that the optical fiber can be tested along the adjustment rings 308 with different curvatures; At the same time, when the adjustment ring 308 is radially extended, the hydraulic oil in the cross cylinder 306 enters the inside of the connecting ring 310 through the multiple groups of liquid outlet pipes 311, and then enters the inside of the spacing adjustment frame 302 through the connecting pipe 312. Since the spacing adjustment frame 302 and the support frame 301 are slidably connected through the fixed sealing block 303, when the hydraulic oil enters the inside of the spacing adjustment frame 302, under the action of the hydraulic oil, the spacing adjustment frame 302 can drive the fixed cylinder 305 to slide relative to the support frame 301 as a whole; That is to say, when the two sets of variable diameter bending wheel mechanisms 3 change their diameters, the spacing between the two sets of variable diameter bending wheel mechanisms 3 is adjusted synchronously, which will not cause the problem of mutual interference between the adjustment rings 308 after the diameter change, and the overall use effect is good, which well meets the detection requirements of optical fiber performance under different curvatures; Furthermore, the two groups of counterweight clamps 603 of the counterweight mechanism 6 play a role in fixing one end of the optical fiber. When the optical fiber is subjected to a bending test, under the action of the two groups of electromagnets 606 and the slide bar 605, the electromagnet 606 generates a magnetic force that can generate a certain adsorption force on the slide bar 605, and the adsorption force can be adjusted, thereby achieving the purpose of automatically adjusting the counterweight during the optical fiber bending test. Specifically, when two sets of counterweight clamps 603 clamp one end of the optical fiber, the gravity of the counterweight arm 601, the adjustment rod 602, the sliding ring 604 and the magnetic adsorption force generated by the electromagnet 606 all act directly on the end of the optical fiber. By adjusting the weight of different counterweights, the actual situation of optical fiber curvature detection is better realized, and the accuracy of optical fiber curvature detection is improved.

[0021] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An optical fiber bending strength testing device, comprising a main body (1), characterized in that: A fixing frame (2) is fixed at the middle position of the inner side of the main body (1); two sets of variable diameter bending wheel mechanisms (3) are movably connected at both ends of the top of the fixing frame (2); and a bending swing arm (4) located above the two sets of variable diameter bending wheel mechanisms (3) is movably connected to the inner side of the main body (1); The variable diameter bending wheel mechanism (3) comprises a support frame (301), a spacing adjustment frame (302), a fixed cylinder (305), a cross cylinder (306), a telescopic rod (307) and an adjustment ring (308), wherein the support frame (301) is fixed to the top of the fixed frame (2), both ends of the inner side of the fixed frame (2) are slidably connected to the spacing adjustment frame (302), and each set of spacing adjustment frames (302) is provided with a fixed cylinder (305) on the inner side, and a cross cylinder (306) is provided inside the two sets of fixed cylinders (305), and the telescopic rod (307) penetrating the fixed cylinder (305) is slidably connected inside the two sets of cross cylinders (306), and the adjustment ring (308) is fixed to the end of the telescopic rod (307); The variable diameter bending wheel mechanism (3) further comprises a liquid inlet pipe (309), a connecting ring (310) and a liquid outlet pipe (311); the liquid inlet pipe (309) extending to the interior of the cross cylinder (306) is fixed inside the fixed cylinder (305); the connecting ring (310) located outside the liquid inlet pipe (309) is fixed on one side of the fixed cylinder (305); and the liquid outlet pipes (311) connected to the connecting ring (310) are located at the four corners of the cross cylinder (306).

2. The optical fiber bending strength testing device according to claim 1, characterized in that: The variable diameter bending wheel mechanism (3) further comprises a fixed sealing block (303), a connecting ring (304), a connecting pipe (312) and a connecting pipe (313); the spacing adjustment frame (302) and the fixed cylinder (305) are fixedly connected via the connecting ring (304); fixed sealing blocks (303) located inside the spacing adjustment frame (302) are fixed at both ends of the support frame (301); a cavity matching the fixed sealing block (303) is provided inside the spacing adjustment frame (302); and the connecting ring (310) and the cavity inside the spacing adjustment frame (302) are connected to each other via the connecting pipe (312).

3. The optical fiber bending strength testing device according to claim 1, characterized in that: The bending swing arm (4) is internally slidably connected to a locking mechanism (5), the locking mechanism (5) comprising a lifting frame (501), a screw rod (502), a slide plate (503), a push plate (504), a clamping block (505) and an inclined block (506), the slide plate (503) being located inside the lifting frame (501) for sliding and being threadedly connected to the screw rod (502), and the push plate (504) being located inside the lifting frame (501) for sliding and being fixedly connected to the slide plate (503).

4. The optical fiber bending strength testing device according to claim 3, characterized in that: The two groups of clamping blocks (505) are located at one end of the lifting frame (501) and are radially slidably connected thereto. An inclined block (506) with mutually matching inclined surfaces is fixed to one end of the two groups of clamping blocks (505) and one end of the push plate (504).

5. The optical fiber bending strength testing device according to claim 4, characterized in that: The locking mechanism (5) further comprises a sliding rod (507), a gear (508), a rack (509) and an extrusion ring (510); the lifting frame (501) and the bending swing arm (4) are slidably connected via the sliding rod (507); a gear (508) is fixed to the outside of the screw rod (502); the top and bottom of the gear (508) are meshed with racks (509); and extrusion rings (510) slidably connected to the two sets of sliding rods (507) are fixed to the ends of the two sets of racks (509).

6. The optical fiber bending strength testing device according to claim 5, characterized in that: The locking mechanism (5) further comprises a positioning ring (511), a handle (512), a positioning rod (513) and a spring (514); the positioning ring (511) is fixed to one end of the lifting frame (501); the handle (512) is fixed to the end of the screw rod (502); positioning rods (513) corresponding to the positioning ring (511) are fixed on both sides of the inner end surface of the handle (512); and a spring (514) is fixed between the handle (512) and the screw rod (502).

7. The optical fiber bending strength testing device according to claim 1, characterized in that: The bottom of the main body (1) is movably connected with a counterweight mechanism (6), and the counterweight mechanism (6) comprises a counterweight arm (601), an adjustment rod (602), a counterweight clamping plate (603), a sliding ring (604) and a sliding rod (605). Two groups of the sliding rods (605) are fixed inside the main body (1) and are slidably connected to the two groups of sliding rings (604). The counterweight arm (601) is fixed to the sliding ring (604) and extends to the outside of the main body (1). The two groups of the adjustment rods (602) are fixed to the ends of the counterweight arms (601), and the inner ends of the adjustment rods (602) are both fixed with counterweight clamping plates (603).

8. The optical fiber bending strength testing device according to claim 7, characterized in that: The counterweight mechanism (6) further comprises an electromagnet (606), a control power supply module (607) and a spiral wire (608); the two groups of electromagnets (606) are fixed on the top of the two groups of sliding rings (604) and are located outside the sliding rod (605); the control power supply module (607) is installed inside the main body (1); and the control power supply module (607) and the two groups of electromagnets (606) are electrically connected via the spiral wire (608).

9. The optical fiber bending strength testing device according to claim 3, characterized in that: An optical power meter (7) is fixed to the top of the locking mechanism (5), and a light source module (11) matching the optical power meter (7) is slidably connected to the bottom of the inner side of the fixing frame (2).

10. The optical fiber bending strength testing device according to claim 1, characterized in that: The bending swing arm (4) and the main body (1) are rotatably connected via a rotating shaft (8); a limiting ring (10) is fixed inside the main body (1); and a limiting rod (9) extending into the interior of the limiting ring (10) is fixed inside the bending swing arm (4).

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