A special optical fiber core rotation device and method

Abstract

The present invention relates to the technical field of optical fiber rotary connectors, and provides a special optical fiber core alignment rotation device and method. The rotation device includes an output optical fiber and a receiving optical fiber disposed at both ends of the rotation device. An outer shell is provided outside the rotation device, and further includes: a movable sleeve axially movably installed inside the outer shell. The outer shell is rotationally connected to the receiving optical fiber, and a buffer space for the receiving optical fiber inside the outer shell is formed through the axially movable range; the first set of convex lens and concave lens can ensure the complete transmission of light within a certain movable range, and then a buffer space for the receiving optical fiber after being connected to the rotation device is set within this movable range to protect the optical fiber; secondly, bearings are provided both outside the inner core and the outer surface layer of the receiving optical fiber, and an extended adapter sleeve is provided to ensure the smoothness and stability of the rotation of the receiving optical fiber; finally, the positioning sleeve and the core alignment sleeve can accurately position the optical fiber and the rotation device, ensuring the connection accuracy while facilitating the connection.

Description

Technical Field

[0001] The present invention relates to the field of fiber optic rotary connectors, and more specifically, to a special fiber optic core alignment rotary device and method. Background Art

[0002] A fiber optic rotary connector is a connector specifically designed to transmit optical signals in a rotating system. It allows the fiber optic to continuously rotate as the mechanical component rotates while maintaining signal transmission. Generally, fiber optic rotary connectors are mainly applied to scenarios that require 360° free rotation, such as aerospace, military, robotics, radar systems, and industrial automation, etc.

[0003] When connecting optical fibers, first remove the external protective layer, clean the surface of the fiber optic core, and insert the optical fiber core into the fiber optic rotary connector. Although this plugging method can improve convenience, the position after insertion cannot be accurately guaranteed. Secondly, light scattering is likely to occur at the connection of the optical fibers, and the output light cannot be fully conducted through the connector to the receiving optical fiber. Finally, since the relative axial direction of the two optical fibers needs to be fixed to ensure the docking accuracy of the two optical fibers, external tensile force will directly affect the docking part of the optical fiber and the connector, and even directly cause detachment, resulting in line damage.

[0004] To solve the above problems, a special fiber optic core alignment rotary device and method are proposed in this application. Summary of the Invention

[0005] The purpose of the present invention is to provide a special fiber optic core alignment rotary device and method, which are compact in structure and reliable in performance to solve the problems in the prior art.

[0006] The object of the present invention can be achieved by the following technical solutions: A special optical fiber core rotation device, including an output optical fiber and a receiving optical fiber disposed at both ends of the rotation device. An outer shell is provided outside the rotation device, and further includes: A movable sleeve axially movably installed inside the outer shell, the outer shell is rotatably connected to the receiving optical fiber, and a buffer space for the receiving optical fiber inside the outer shell is formed through the axially movable manner; A rear end cover located at the rear end of the outer shell and fixedly installing the output optical fiber, the rear end cover is detachably connected to the output optical fiber; A front end cover located at the front end of the outer shell and through which the received light passes; A positioning sleeve flush with the end of the optical fiber core. After the optical fiber is positioned and glued flush with the positioning sleeve, the optical fiber is positioned in the rotation device by using the positioning sleeve; Two core alignment sleeves rotatably connected inside the movable sleeve and fixed in the rear end cover, the core alignment sleeves are inserted and matched with the positioning sleeve to position the optical fiber in the rotation device; A convex lens and a concave lens located inside the two core alignment sleeves relatively close to each other at one end. The convex lens converges the light of the output optical fiber and uniformly transmits it to the receiving optical fiber through the diffusion of the concave lens. The concave lens can move synchronously along the axis inside the outer shell following the movable sleeve, and the moving range of the concave lens is between the intersection point formed by the refraction of the light from the convex lens and the refraction.

[0007] In the above technical solution, the convex lens and the concave lens enable the light to be stably transmitted within a certain movable range. By using this movable range, a buffer space for the receiving optical fiber to bear force is set, which ensures the stable transmission of the optical fiber and protects the receiving optical fiber at the same time; The two optical fibers can be accurately aligned through the precise cooperation of the positioning sleeve and the core alignment sleeve.

[0008] A first bearing enabling the two to rotate is provided between the outside of the core alignment sleeve connected to the receiving optical fiber and the outer shell, and the first bearing is located outside the inner core of the receiving optical fiber. The inner part of the outer shell is rotatably connected with a transfer sleeve through at least two second bearings, and the transfer sleeve is located outside the outer surface layer of the receiving optical fiber;

[0009] In the above technical solution, multiple second bearings effectively extend the length of the transfer sleeve. The extended transfer sleeve is connected to the optical fiber, making the optical fiber more accurately core-aligned and ensuring smooth rotation at the same time.

[0010] The outer shell includes anti-rotation rods circumferentially distributed on the inner surface, movable holes circumferentially distributed and opened at the front end of the outer shell, and a connecting platform provided at the front end of the outer shell;

[0011] In the above technical solution, the movable holes communicate the inside and outside of the outer shell and cooperate with the movable rods, providing convenience for the assembly of the movable sleeve. The connecting platform provides support for the connection between the outer shell and the front end cover, ensuring the stability after connection.

[0012] The movable sleeve includes a first cylinder with a first bearing installed inside, a second cylinder with a second bearing installed inside, and a movable rod fixed at the front end of the movable sleeve and sliding through the movable hole. A spring is sleeved outside the movable rod and abuts between the first cylinder and the inner side of the housing. The spring buffers the axial tensile force exerted on the receiving optical fiber outward. The movable rod passes through the housing through the movable hole, and a lock nut is connected to the passing-through part.

[0013] In the above technical solution, the spring buffers the effect after the receiving optical fiber is subjected to an external tensile force. After the lock nut is tightened, it is fixed on the movable rod to determine the axial movable range of the movable sleeve inside the housing.

[0014] The rear end cover includes a third cylinder for fixing the core sleeve in cooperation with the output optical fiber, a fourth cylinder fixed to the outer surface layer of the output optical fiber, a rear end plate located at the rear end of the housing, and an inner support plate forming a support inside the housing.

[0015] In the above technical solution, the third cylinder and the fourth cylinder support the inner core and the outer surface layer of the output optical fiber to ensure a tight fit. The support formed by the inner support plate improves the compressive resistance of the rotating device.

[0016] A positioning groove for sliding cooperation with the anti-rotation rod is formed outside the movable sleeve. A positioning port for sliding cooperation with the anti-rotation rod is formed on the inner support plate. A rear locking hole is provided through the rear end plate and is pressed against the anti-rotation rod by a first screw.

[0017] In the above technical solution, the cooperation of the positioning groove and the positioning port with the anti-rotation rod not only ensures the assembly accuracy of the movable sleeve and the rear end cover inside the housing, but also has an anti-rotation effect, making the structure of the rotating device more stable.

[0018] The front end cover includes a buffer hole formed on the inner side. The movable rod and the lock nut are movable in the buffer hole. A locking platform is formed inside the front end cover and abuts against the connecting platform and is pressed by a second screw.

[0019] In the above technical solution, setting the passing-through part of the movable rod and the lock nut outside the housing is convenient for assembly, and then setting the front end cover to protect it.

[0020] A positioning ring is formed outside the positioning sleeve. A positioning step for inserting and positioning the positioning ring is formed on the inner side of the core sleeve. An avoidance ring is also provided outside the positioning sleeve. A heat shrinkable tube is sleeved outside the inner core, outer surface layer of the cable, and the avoidance ring.

[0021] In the above technical solution, the use of the heat shrinkable tube provides additional protection for the inner core, outer surface layer of the cable, and the avoidance ring, effectively improving the stability of the optical fiber during rotation and when subjected to external tensile forces.

[0022] The present invention also provides an assembly method for a special optical fiber core alignment rotation device, including the following steps:

[0023] S1. Glue the outer ring of the first bearing inside the first cylinder, glue the concave lens inside the core alignment sleeve, and glue the outside of the core alignment sleeve to the inner ring of the first bearing. Glue the outer rings of multiple second bearings inside the second cylinder, and glue the outside of the adapter sleeve to the inner rings of multiple second bearings. The core alignment sleeve and the adapter sleeve are arranged concentrically.

[0024] S2. Sleeve the spring outside the movable rod. The movable rod faces inward and is inserted into the rear end of the housing. After the movable rod passes through the movable hole, a locking nut composed of two nuts forms a block at the passing position.

[0025] S3. Pass the second screw through the locking platform and screw it with the connecting platform to fixedly connect the front end cover to the front end of the housing. At this time, the part of the movable rod passing through the housing and the locking nut are both located in the buffer hole.

[0026] S4. Glue a convex lens inside another core alignment sleeve and glue the outside of the core alignment sleeve inside the third cylinder. The rear end cover is installed inside the housing along the positioning port and the anti-rotation rod, and the rear end cover is fixed in the housing by screwing the first screw through the locking hole and pressing it against the anti-rotation rod at the end of the rear end cover.

[0027] The assembly method in the above technical solution is simple and precise, and the overall exterior is smooth without being obtrusive. At the same time, the structural compactness of the rotation device as a whole is ensured.

[0028] The present invention also provides a connection method for a special optical fiber core alignment rotation device, including the following steps:

[0029] S1. Strip out the inner core of the optical fiber, clean the inner core and the outer surface layer, polish the end of the optical fiber smoothly, apply glue to the inner ring of the positioning sleeve and sleeve it outside the inner core to form a fixed connection. The end of the positioning sleeve away from the avoidance ring is flush with the end of the inner core.

[0030] S2. Sleeve the heat shrinkable tube outside the optical fiber and the positioning sleeve and heat it so that the heat shrinkable tube wraps around the outside of the avoidance ring, the inner core of the optical fiber, and the outer surface layer to form a whole.

[0031] S3. Apply glue to the outside of the positioning ring on the output optical fiber and the outside of the heat shrinkable tube. Insert the positioning sleeve into the inside of the core alignment sleeve located in the rear end cover. The positioning ring fits and positions with the positioning step, and the outside heat shrinkable tube is simultaneously glued and fixed to the local part of the core alignment sleeve and the inside of the fourth cylinder.

[0032] S4. Assemble the receiving optical fiber in the same way as in step 1 and step 2 to form a whole, and apply glue to the outside of the positioning ring and the heat shrinkable tube.

[0033] S5. The positioning sleeve is inserted into the core sleeve through the positioning of the avoidance ring and the positioning step and fixed by gluing. The outside of the heat shrinkable tube is simultaneously glued and fixed to the inside of the movable sleeve, the inside of the core sleeve, and the inside of the adapter sleeve. At this time, the output optical fiber, the receiving optical fiber, and the positioning sleeve and the core sleeve connected to the two optical fibers are all concentric;

[0034] S6. After the glue solidifies, test the flexibility of the rotating device and the optical fiber transmission effect;

[0035] In the above technical solution, first, the end of the optical fiber and the positioning sleeve are positioned externally, and then the optical fiber is positioned in the rotating device by using the positioning ring in the positioning sleeve and the positioning step in the core sleeve. Finally, the position accuracy of the optical fiber in the rotating device can be ensured, and the connection method is simple and reliable.

[0036] Advantages of the present invention:

[0037] In the present invention, the positioning sleeve is docked with the optical fiber core externally, and the operator can intuitively ensure the flatness of the docking surface. Then, the accurate connection position of the optical fiber is ensured by the docking of the positioning sleeve with the upper positioning ring and the positioning step in the core sleeve, guaranteeing the connection accuracy. At the same time, the connection is made through the heat shrinkable tube inside and outside the optical fiber and on the outside of the positioning sleeve, ensuring the structural stability of the optical fiber connection;

[0038] In the present invention, a convex lens and a concave lens are arranged at the connection of the two optical fibers. The convex lens can concentrate the light at the end of the output optical fiber to avoid the divergence and loss of light. Then, after being received by the concave lens, the light is refracted more evenly to the receiving optical fiber to ensure the stable transmission of light;

[0039] In the present invention, the outside of the inner core of the receiving optical fiber is rotatably connected to the outer shell through a first bearing, and the outside is connected through two second bearings and an adapter sleeve. By arranging rotating parts both inside and outside, and the adapter sleeve has a certain length, ensuring stable connection while guaranteeing the smoothness of rotation;

[0040] Since there is a certain distance between the convex lens after refraction and the intersection point, the light can be focused within this distance. Therefore, within this range, the outer shell is movably connected through a spring, forming an axial buffer while ensuring the stable transmission of light, improving the tensile strength and buffering effect of the optical fiber, and further protecting the connection between the optical fiber and the connector;

[0041] The rear end cover provided at one end of the output optical fiber facilitates the assembly of the outer shell and its connecting parts inside the output optical fiber, and at the same time can seal one end of the output optical fiber. The front end cover at the other end of the output optical fiber forms a space for the movable rod and the locking nut, and at the same time protects the second bearing and the adapter sleeve at the end, facilitating the disassembly and assembly of the overall connector. Description of the Drawings

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 Schematic diagram of the connection state of the present invention;

[0044] Figure 2 is Figure 1 Schematic diagram of the rear view structure;

[0045] Figure 3 is Figure 1 Schematic diagram of the right view structure;

[0046] Figure 4 is Figure 1 Schematic diagram of the left view structure;

[0047] Figure 5 Schematic diagram of the half-section structure of the present invention;

[0048] Figure 6 Schematic diagram of the structure where the connection between the outer shell and the front end cover of the present invention is disassembled and partially sectioned;

[0049] Figure 7 Schematic diagram of the structure where the movable sleeve and its connecting parts of the present invention are disassembled;

[0050] Figure 8 Schematic diagram of the structure where the connection part between the optical fiber and the positioning sleeve is disassembled;

[0051] Figure 9 Schematic diagram of the half-section structure of the outer shell;

[0052] Figure 10 Schematic diagram of the enlarged rear end cover;

[0053] Figure 11 Schematic diagram of the half-section of the core sleeve and its connection with the lens;

[0054] In the drawings, the list of components represented by each reference numeral is as follows:

[0055] In the figure: 1. Output optical fiber; 2. Receiving optical fiber;

[0056] 3. Outer shell; 301. Anti-rotation rod; 302. Movable hole; 303. Connection platform;

[0057] 4. Movable sleeve; 401. First cylinder; 402. Second cylinder; 403. Movable rod; 404. Positioning groove;

[0058] 5. Rear end cover; 501. No. 3 cylinder; 502. No. 4 cylinder; 503. Rear end plate; 5031. Rear locking hole; 504. Inner support plate; 5041. Positioning port;

[0059] 6. Front end cover; 601. Buffer hole; 602. Locking platform;

[0060] 7. Positioning sleeve; 701. Positioning ring; 702. Avoidance ring;

[0061] 8. Heat shrinkable tube;

[0062] 9. Core alignment sleeve; 901. Positioning step;

[0063] 10. Convex lens; 11. Concave lens; 12. No. 1 bearing; 13. No. 2 bearing; 14. Adapter sleeve; 15. Spring; 16. Locking nut; 17. First screw; 18. Second screw. Detailed implementation manners

[0064] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention. Embodiment

[0065] As Figure 1 - Figure 11 shown:

[0066] This embodiment provides a special optical fiber core alignment rotating device, and the purpose of its structural design is to effectively protect the optical fiber during the rotation process of the optical fiber and ensure the stable transmission of the optical signal. This device is particularly suitable for optical fiber communication systems that require high-precision docking and rotation operations.

[0067] The special optical fiber core alignment rotating device includes multiple main components: output optical fiber 1, receiving optical fiber 2, housing 3, movable sleeve 4, rear end cover 5, front end cover 6, positioning sleeve 7, core alignment sleeve 9, convex lens 10, concave lens 11, etc.

[0068] The housing 3 has a support function for the rotational operation of the optical fiber, and multiple mating components are provided inside to ensure the stability of each component during the rotation process. Anti-rotation rods 301 are circumferentially distributed on the inner wall of the housing 3 for anti-rotation cooperation with the movable sleeve 4 and the rear end cover 5 to prevent unnecessary offset of the device during rotation; multiple movable holes 302 are provided at the front end of the housing 3 to allow the movable rods 403 in the movable sleeve 4 to pass through. The spring 15 sleeved outside the movable rod 403 has a buffering effect, and the penetration setting of the movable rod 403 also facilitates the connection of the lock nut 16; in addition, a connecting platform 303 is provided at the front end of the housing 3 for connection with the front end cover 6.

[0069] The movable sleeve 4 is located inside the housing 3 and can move axially to provide a buffering space for receiving the optical fiber 2. The movable sleeve 4 is composed of a first cylinder 401 and a second cylinder 402. A first bearing 12 is installed inside the first cylinder 401 to support the rotation of the received optical fiber 2 inside the movable sleeve 4; multiple second bearings 13 for supporting the adapter sleeve 14 are installed inside the second cylinder 402, enabling the received optical fiber 2 to rotate smoothly inside the movable sleeve 4; a movable rod 403 is provided at the front end of the movable sleeve 4. The movable rod 403 passes through the movable hole 302 of the housing 3 and provides a buffering force through the spring 15 to prevent the received optical fiber 2 from being affected by axial tension during rotation and affecting the connection effect.

[0070] The rear end cover 5 is located at the rear end of the housing 3 and is responsible for fixing the output optical fiber 1; the rear end cover 5 is fixed to the core alignment sleeve 9 through a third cylinder 501 and is fixedly connected to the outer surface layer of the output optical fiber 1 through a fourth cylinder 502; an inner support plate 504 and a rear end plate 503 are also provided on the rear end cover 5 to ensure the strength of the housing 3 and are fixedly connected to the anti-rotation rod 301 through screws 17 to ensure the stable installation of the rear end cover 5 inside the housing 3.

[0071] The front end cover 6 is located at the front end of the housing 3. A buffer hole 601 is provided on its inner side, and the buffer hole 601 is used to accommodate the movable rod 403 and the lock nut 16; the front end cover 6 is also tightly connected to the connecting platform 303 through a locking platform 602 under the action of the second screw 18 to further ensure the stability of the front end.

[0072] Inside the two core alignment sleeves 9, a convex lens 10 and a concave lens 11 are respectively provided; the convex lens 10 is used to converge the optical signal transmitted by the output optical fiber 1 and guide it to the concave lens 11; the concave lens 11 can achieve uniform optical signal transmission through its axial synchronous movement with the movable sleeve 4, and ensure that when the received optical fiber 2 receives the optical signal, the error caused by the optical path offset can be minimized; this optical design ensures the stable transmission of the optical signal during rotation.

[0073] The positioning sleeve 7 is located at the center of the device, and a positioning ring 701 is formed on its outer part, which cooperates with the positioning step 901 on the inner side of the core-aligning sleeve 9, thus precisely fixing the position of the optical fiber. An avoidance ring 702 is also provided on the outer part of the positioning sleeve 7 for cooperating with the heat-shrinkable tube 8; by wrapping the heat-shrinkable tube 8 around the positioning sleeve 7, the inner core and the outer surface layer of the optical fiber, the protection of the optical fiber is further enhanced.

[0074] To ensure the smooth operation of each component during rotation, a first bearing 12 enabling rotation is provided between the outer part of the core-aligning sleeve 9 and the movable sleeve 4 to which the receiving optical fiber 2 is connected. In addition, the inside of the movable sleeve 4 is rotationally connected to the adapter sleeve 14 through at least two second bearings 13. The adapter sleeve 14 is located on the outer surface layer of the receiving optical fiber 2, ensuring the rotational stability and precise core alignment of the receiving optical fiber 2 in the movable sleeve 4.

[0075] This embodiment also provides an assembly method for a special optical fiber core-aligning rotating device, including the following steps:

[0076] S1. The outer ring of the first bearing 12 is adhesively bonded inside the first cylinder 401, the concave lens 11 is adhesively bonded inside the core-aligning sleeve 9, and the outer part of the core-aligning sleeve 9 is adhesively bonded to the inner ring of the first bearing 12. The outer rings of multiple second bearings 13 are adhesively bonded inside the second cylinder 402, and the outer part of the adapter sleeve 14 is adhesively bonded to the inner rings of the multiple second bearings 13. The core-aligning sleeve 9 and the adapter sleeve 14 are arranged concentrically.

[0077] S2. The spring 15 is sleeved outside the movable rod 403. The movable rod 403 faces inward and is inserted into the rear end of the housing 3. After passing through the movable hole 302, the movable rod 403 forms a block at the passing position through the lock nut 16 composed of two nuts.

[0078] S3. The front end cover 6 is fixedly connected to the front end of the housing 3 by screwing the second screw 18 through the locking platform 602 and the screw thread of the connecting platform 303. At this time, the part of the movable rod 403 passing through the housing 3 and the lock nut 16 are both located in the buffer hole 601.

[0079] S4. Another convex lens 10 is adhesively bonded inside the core-aligning sleeve 9, and the outer part of the core-aligning sleeve 9 is adhesively bonded inside the third cylinder 501. The rear end cover 5 is inserted into the housing 3 along the positioning port 5041 and the anti-rotation rod 301, and the rear end cover 5 is fixed in the housing 3 by screwing the first screw 17 through the locking hole 5031 at the end of the rear end cover 5 and pressing it against the screw thread of the anti-rotation rod 301.

[0080] This embodiment also provides a connection method for a special optical fiber core-aligning rotating device, including the following steps:

[0081] S1. Strip out the inner core of the optical fiber and clean the inner core and the outer surface layer. The end of the optical fiber is polished smoothly. Glue is applied to the inner ring of the positioning sleeve 7 and it is sleeved outside the inner core to form a fixed connection. One end of the positioning sleeve 7 away from the avoidance ring 702 is flush with the end of the inner core.

[0082] S2. The heat shrinkable tube 8 is sleeved outside the optical fiber and the positioning sleeve 7 and heated, so that the heat shrinkable tube 8 wraps outside the avoidance ring 702, the inner core and the outer surface layer of the optical fiber to form a whole;

[0083] S3. Glue is applied to the outside of the positioning ring 701 outside the output optical fiber 1 and the outside of the heat shrinkable tube 8. The positioning sleeve 7 is inserted into the inner part of the core alignment sleeve 9 in the rear end cover 5. The positioning ring 701 is fitted and positioned with the positioning step 901. The outside heat shrinkable tube 8 is simultaneously adhesively fixed to the partial part of the core alignment sleeve 9 and the inside of the fourth cylinder 502;

[0084] S4. According to Step 1 and Step 2, the receiving optical fiber 2 is also assembled in the same way to form a whole, and glue is applied to the outside of the positioning ring 701 and the heat shrinkable tube 8;

[0085] S5. The positioning sleeve 7 is inserted into the core alignment sleeve 9 through the positioning of the avoidance ring 702 and the positioning step 901 and adhesively fixed. The outside of the heat shrinkable tube 8 is simultaneously adhesively fixed to the inside of the core alignment sleeve 9 in the movable sleeve 4 and the inside of the adapter sleeve 14. At this time, the output optical fiber 1, the receiving optical fiber 2, and the positioning sleeve 7 and the core alignment sleeve 9 connecting the two optical fibers are all concentric;

[0086] S6. After the glue solidifies, test the flexibility of the rotating device and the optical fiber transmission effect.

[0087] It can be understood that, firstly, the convex lens and the concave lens set can ensure the complete transmission of light within a certain movable range, and then a buffer space for the receiving optical fiber after being connected to the rotating device is set within this movable range to protect the optical fiber; secondly, bearings are arranged outside both the inner core and the outer surface layer of the receiving optical fiber, and an extended adapter sleeve is set to ensure the smoothness and stability of the rotation of the receiving optical fiber; finally, the positioning sleeve and the core alignment sleeve set can accurately position the optical fiber and the rotating device, ensuring the connection accuracy while facilitating the connection.

[0088] In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more; it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0089] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A special optical fiber core rotation device, including an output optical fiber and a receiving optical fiber placed at both ends of the rotation device, and an outer shell is provided outside the rotation device, characterized in that, Further included are: A movable sleeve axially movably installed inside the housing, the housing receiving a fiber optic rotary connection, and forming a buffer space for receiving the fiber optic inside the housing through the movable axis; A rear end cover located at the rear end of the housing and fixedly installing the output fiber optic, the rear end cover being detachably connected to the output fiber optic; A front end cover located at the front end of the housing and through which the receiving fiber optic passes; A positioning sleeve flush with the end of the fiber optic core. After the fiber optic is positioned and glued flush with the positioning sleeve, the fiber optic is positioned in the rotating device by using the positioning sleeve; Two centering sleeves rotatably connected inside the movable sleeve and fixed in the rear end cover, the centering sleeves being inserted and mated with the positioning sleeve to position the fiber optic in the rotating device; A convex lens and a concave lens located inside the two centering sleeves relatively close to one end. The convex lens converges the light of the output fiber optic and uniformly transmits it to the receiving fiber optic through the diffusion of the concave lens. The concave lens can move axially synchronously with the movable sleeve inside the housing, and the movable range of the concave lens is between the intersection point formed by the refraction of the light from the convex lens; A first bearing enabling rotation between the outside of the centering sleeve connected to the receiving fiber optic and the housing is provided, and the first bearing is located outside the core of the receiving fiber optic. A transfer sleeve is rotatably connected inside the housing through at least two second bearings, and the transfer sleeve is located outside the outer surface layer of the receiving fiber optic; The housing includes anti-rotation rods circumferentially distributed on the inner surface, movable holes circumferentially distributed at the front end of the housing, and a connecting platform provided at the front end of the housing; The movable sleeve includes a first cylinder with a first bearing installed inside, a second cylinder with a second bearing installed inside, and a movable rod fixed at the front end of the movable sleeve and slidably passing through the movable hole. A spring is sleeved outside the movable rod and abuts between the first cylinder and the inner side of the housing. The spring buffers the axial pulling force of the receiving fiber optic outward. The movable rod passes through the housing through the movable hole, and the passing part is connected with an anti-lock nut; The rear end cover includes a third cylinder for fixing the centering sleeve for mating with the output fiber optic, a fourth cylinder fixed to the outer surface layer of the output fiber optic, a rear end plate located at the rear end of the housing, and an inner support plate forming a support inside the housing; A positioning groove slidably mated with the anti-rotation rod is formed outside the movable sleeve, a positioning port slidably mated with the anti-rotation rod is formed on the inner support plate, and a rear locking hole pressed against the anti-rotation rod by a first screw is provided through the rear end plate; The front end cover includes a buffer hole formed on the inner side, the movable rod and the anti-lock nut are movable in the buffer hole, and a locking platform is formed inside the front end cover and abuts against the connecting platform and is pressed by a second screw; 2. The special optical fiber pair core rotation device according to claim 1, characterized in that: A positioning ring is formed outside the positioning sleeve, a positioning step for inserting and positioning the positioning ring is formed inside the centering sleeve, and an avoidance ring is also provided outside the positioning sleeve. A heat shrinkable tube is sleeved outside the core and outer surface layer of the cable and the avoidance ring; 3. An assembly method of a special fiber optic centering rotary device. According to the special fiber optic centering rotary device described in claim 1, the assembly method includes the following steps: S1. The outer ring of the first bearing is adhesively bonded inside the first cylinder. The concave lens is adhesively bonded inside the core-aligning sleeve, and the outside of the core-aligning sleeve is adhesively bonded to the inner ring of the first bearing. The outer rings of multiple second bearings are adhesively bonded inside the second cylinder, and the outside of the adapter sleeve is adhesively bonded to the inner rings of the multiple second bearings. The core-aligning sleeve and the adapter sleeve are arranged concentrically. S2. The spring is sleeved outside the movable rod. The movable rod faces inward and is inserted into the rear end of the housing. After the movable rod passes through the movable hole, a locking nut composed of two nuts forms a block at the passing position. S3. The front end cover is fixedly connected to the front end of the housing by the second screw passing through the locking platform and screwing with the connecting platform. At this time, the part of the movable rod passing through the housing and the locking nut are both located in the buffer hole. S4. Another convex lens is adhesively bonded inside the core-aligning sleeve, and the outside of the core-aligning sleeve is adhesively bonded inside the third cylinder. The rear end cover is inserted into the housing along the positioning port and the anti-rotation rod, and at the end of the rear end cover, the rear end cover is fixed in the housing by the first screw passing through the locking hole and screwing tightly with the anti-rotation rod.

4. A connection method for a special optical fiber core-aligning rotating device. According to the special optical fiber core-aligning rotating device described in any one of claims 1-2, the connection method includes the following steps: S1. Strip out the inner core of the optical fiber and clean the inner core and the outer surface layer. The end of the optical fiber is polished smoothly. Glue is applied to the inner ring of the positioning sleeve and the positioning sleeve is sleeved outside the inner core to form a fixed connection. The end of the positioning sleeve away from the avoidance ring is flush with the end of the inner core. S2. The heat shrinkable tube is sleeved outside the optical fiber and the positioning sleeve and heated so that the heat shrinkable tube wraps around the outside of the avoidance ring, the inner core of the optical fiber, and the outer surface layer to form a whole. S3. Glue is applied to the outside of the positioning ring of the output optical fiber and the outside of the heat shrinkable tube. The positioning sleeve is inserted into the inside of the core-aligning sleeve located in the rear end cover. The positioning ring fits and positions with the positioning step, and the outside heat shrinkable tube is simultaneously adhesively bonded and fixed to the local part of the core-aligning sleeve and the inside of the fourth cylinder. S4. Assemble the receiving optical fiber in the same way as in steps 1 and 2 to form a whole, and apply glue to the outside of the positioning ring and the heat shrinkable tube. S5. The positioning sleeve is inserted into the core-aligning sleeve through the positioning of the avoidance ring and the positioning step and adhesively bonded and fixed. The outside of the heat shrinkable tube is simultaneously adhesively bonded and fixed to the inside of the core-aligning sleeve of the movable sleeve and the inside of the adapter sleeve. At this time, the output optical fiber, the receiving optical fiber, and the positioning sleeve and the core-aligning sleeve connected to the two optical fibers are all concentric. S6. After the glue solidifies, test the flexibility of the rotating device and the optical fiber transmission effect.

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