Glue-free internal outgoing optical fiber cylinder

Abstract

The invention discloses a glue-free internal outgoing optical fiber cylinder which comprises a shell, and a winding reel is arranged in the shell. The winding reel structurally comprises a sleeve, an inner baffle, an outer baffle, a damping seat, an inner shaft and an elastic damping brush, the two ends of the sleeve are fixedly connected with the inner baffle and the outer baffle respectively, the inner end of the damping seat is fixed in a center hole of the outer baffle, the inner shaft is located in the sleeve, the inner end of the inner shaft is fixedly connected with the inner baffle, and the elastic damping brush is arranged in the sleeve. The outer end of the inner shaft penetrates out of a cavity of the damping seat, a conical transition section on the inner shaft and the cavity wall of the inner end of the damping seat form a wire outlet channel, an inner port of the damping seat and the edge, making contact with an optical fiber, of the outer end of the inner shaft are arc transition faces, the arc transition faces generate friction resistance on the optical fiber, and the elastic damping brushes are distributed on the inner wall of the outer end of the damping seat in a circumferential mode. The elastic damping brush applies a radial clamping force to the optical fiber; and through a built-in mechanical damping structure, stable and sufficient outgoing line damping is provided, and the phenomenon of uncontrolled outgoing line caused by the dead weight of the optical fiber is effectively counteracted.

Description

Technical Field

[0001] This invention belongs to the field of drone winding tubes, and in particular, a glue-free internal fiber optic tube. Technical Background

[0002] Currently, in the processes of drone flight control, high-altitude photography, and fiber optic communication transmission, it is often necessary to release optical fibers from the winding drum. Existing fiber optic cable exit methods are mainly divided into outgoing cable and internal cable exit methods.

[0003] Outgoing cable method: The optical fiber is drawn from the outside of the fiber optic tube. When the fiber optic tube is hovering or flying at high altitude and low speed, the lack of sufficient outgoing cable damping due to the fiber's own gravity results in an outgoing cable length exceeding the actual flight requirement. Excess fiber can easily become tangled and knotted after falling to the ground, potentially leading to signal interruption or even fiber breakage.

[0004] When a drone flies, the optical fiber is drawn out from the winding cylinder by traction force; this method of fiber extraction is called internal extraction. To address the issue of damping and preventing fiber unraveling in internal extraction, existing technology involves winding the optical fiber around a central axis inside the winding cylinder and applying adhesive between the fiber layers to increase damping during extraction. However, this adhesive-based method has significant drawbacks: the adhesive is greatly affected by ambient temperature and humidity, and it is prone to aging and deterioration over time, leading to unstable damping force and severely impacting product reliability under various operating conditions. Furthermore, the use of adhesive increases the overall weight of the cylinder, hindering lightweight drone design, and the cured adhesive occupies interlayer space, limiting the fiber density and cylinder miniaturization. Summary of the Invention

[0005] This invention provides a glue-free internal fiber optic tube, which solves the problem of unstable cable damping in existing internal cable exit methods.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: a glue-free internal fiber optic tube, comprising a shell, and a winding tube disposed inside the shell; characterized in that: the structure of the winding tube includes a sleeve, an inner baffle, an outer baffle, a damping seat, an inner shaft, and elastic damping brushes; both ends of the sleeve are fixedly connected to the inner baffle and the outer baffle, respectively; the inner end of the damping seat is fixed in the central hole of the outer baffle; the inner shaft is located inside the sleeve; the inner end of the inner shaft is fixedly connected to the inner baffle; the outer end of the inner shaft passes through the cavity of the damping seat; the conical transition section on the inner shaft forms a wire exit channel with the inner end cavity wall of the damping seat; the edges of the inner port of the damping seat and the outer end of the inner shaft that contact the optical fiber are arc transition surfaces; the arc transition surfaces generate frictional resistance to the optical fiber; the elastic damping brushes are circumferentially distributed on the inner wall of the outer end of the damping seat; the elastic damping brushes apply radial clamping force to the optical fiber.

[0007] Further defining the above technical solution, the structure of the outer shell includes a cylindrical body and a cylindrical cover, with the cylindrical body and the cylindrical cover fixedly connected; the inner end of the cylindrical cover is a hollow inverted cone shape, the outer end of the cylindrical cover is a cylindrical pipe, and the transition between the inner end and the outer end of the cylindrical cover is an arc transition surface.

[0008] The above technical solution is further defined as follows: weight reduction grooves are distributed on the outer end faces of the inner baffle and the outer baffle.

[0009] The above technical solution is further defined as follows: the inner end of the damping seat is a convex stop, the center hole on the outer baffle is a concave stop, and the inner end of the damping seat and the center hole on the outer baffle are interference fit.

[0010] To further specify the above technical solution, the inner shaft is a hollow structure.

[0011] A further improvement to the above technical solution is that the outlet end of the cylinder cover is provided with an optical fiber outlet nozzle, the outlet end of the optical fiber outlet nozzle is provided with a protective cover, and an optical fiber connector is provided inside the protective cover.

[0012] Compared with existing technologies, this invention has the following advantages: 1) Solves the problem of fiber optic sagging due to its own weight: Through the built-in mechanical damping structure, it provides stable and sufficient outgoing line damping, effectively offsetting the "uncontrolled outgoing line" phenomenon caused by the weight of the fiber optic cable when hovering at high altitudes and low speeds, and eliminating the problem of the fiber optic cable losing signals due to excessively long outgoing lines circling on the ground; 2) Extremely high environmental adaptability and stability: Completely eliminates glue, avoiding the problem of glue aging and failure due to high temperature, low temperature, humidity or long-term storage, ensuring the consistency, stability and reliability of outgoing line damping throughout the product's entire life cycle; 3) Lightweight design: The elimination of glue simplifies the complex structure designed to accommodate glue, significantly reducing the overall weight of the winding drum, meeting the urgent need for lightweight mounting equipment for drones and other aircraft; 4) Compact structure and large capacity: Since there is no need to reserve space for glue curing layer and glue coating, the fiber optic cable can be arranged more tightly in the winding drum, thereby accommodating longer fiber optic cables in the same volume, or making the product smaller in size with the same fiber optic cable length. Attached Figure Description

[0013] Figure 1 This is a structural diagram of the present invention.

[0014] Figure 2 This is a cross-sectional view of the present invention.

[0015] Figure 3 This is a structural diagram of a winding drum.

[0016] Figure 4 This is a diagram showing the fit between the damping seat and the inner shaft.

[0017] Figure 5 This is a structural diagram of the damping seat. Detailed Implementation

[0018] like Figure 1 and Figure 2 As shown, a glue-free internal fiber optic tube includes an outer shell. The outer shell has the following structure: a tube body 1 and a tube cover 2. The tube cover is funnel-shaped; that is, the inner end of the tube cover is a hollow inverted cone, and the outer end of the tube cover is a cylindrical tube. The transition between the inner and outer ends of the tube cover is an arc transition surface 201. The first arc transition surface inside the tube cover cavity generates frictional resistance to the optical fiber. The inner end of the tube body is fixedly connected to the tube cover, and the outer end of the tube cover is the outlet end. The outlet end is provided with a fixedly connected optical fiber outlet nozzle 3. The outlet end of the optical fiber outlet nozzle is provided with a fixedly connected protective cover 4. An FC optical fiber connector 5 is provided inside the protective cover.

[0019] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the outer casing contains a winding drum. The winding drum has the following structure: a sleeve 6, an inner baffle 7, an outer baffle 8, a damping seat 9, an inner shaft 10, and an elastic damping brush 11. The sleeve is a hollow cylinder, with both ends fixedly connected to the inner and outer baffles, respectively. The inner end of the damping seat is fixed in the center hole of the outer baffle. The inner shaft is located inside the sleeve, with its inner end fixedly connected to the inner baffle. The outer end of the inner shaft passes through the cavity of the damping seat. The conical transition section 1001 on the inner shaft is connected to the damping seat. The inner end cavity wall forms an outlet channel, and the diameter of the outlet channel increases from the inside to the outside. The edge of the inner port of the damping seat that contacts the optical fiber is the second arc transition surface 901, and the edge of the outer end of the inner shaft that contacts the optical fiber is the third arc transition surface 1002. One end of the elastic damping brush is fixedly connected to the outer end of the damping seat, and the other end of the elastic damping brush faces the inner shaft. The elastic damping brush is distributed in a circumferential shape around the inner shaft. The elastic damping brush applies a radial clamping force to the optical fiber. The elastic damping brush is made of soft nylon bristles.

[0020] like Figure 2 As shown, weight-reducing grooves 12 are distributed on the outer end faces of the inner and outer baffles, which is beneficial for weight reduction and lower production costs.

[0021] like Figure 4 and Figure 5 As shown, the inner end of the damping seat is a convex stop 902, and the center hole 801 on the outer baffle is a concave stop. The inner end of the damping seat and the center hole on the outer baffle are interference fit; the interference connection method is conducive to lightweighting and simplified production.

[0022] like Figure 3 As shown, the inner shaft is a hollow structure, which is beneficial for weight reduction and lower production costs.

[0023] The core working principle of this invention is "mechanical friction damping replacing chemical adhesive damping". 1) Initial state: The optical fiber without glue is tightly wound inside the winding cylinder, with no loose strands. Inner and outer baffles limit the winding of the optical fiber. The inner end of the optical fiber passes through the optical fiber cylinder to communicate with the UAV, and the outer end of the optical fiber 13 passes through the elastic damping brush and is led out from the optical fiber outlet. The FC optical fiber connector is taken out from the protective cover and communicates with the UAV control equipment. 2) Outgoing process: When an external pulling force is applied to the optical fiber outlet, the pulling force is first transmitted to the optical fiber segment located inside the cylinder cover. Because the elastic damping brush applies a radial clamping force to the optical fiber, the optical fiber must overcome this clamping force to move. Once the tension overcomes the clamping force, the optical fiber begins to slide towards the lead-out end. During the process of the optical fiber rotating relative to the inner axis, the first, second, and third circular arc transition surfaces generate frictional resistance on the optical fiber. As the optical fiber detaches from the winding tube and enters the inner cavity of the tube cover, it must overcome the sliding friction generated by the circular arc transition surfaces. This resistance generated by purely physical contact is stable and controllable, and does not rely on the chemical adhesiveness of glue. The circular arc transition surfaces can also prevent the problem of the edge cutting the optical fiber. 2) Hovering state: When the external tension disappears (drone hovering), the clamping force of the elastic damping brush becomes the only braking force to prevent the optical fiber from sliding out due to its own weight. Since this clamping force is greater than the weight of a small section of optical fiber, the optical fiber is firmly "stuck" in the damping cavity and will not continue to slide out, thus achieving powerless hovering without losing the wire.

[0024] The mechanical friction damping is a combination of sliding friction and clamping force; the damping force is adjustable: by designing the friction coefficient, contact area or clamping force of the elastic damping brush of the damping structure, the output damping force can be precisely adjusted to meet the needs of optical fibers of different diameters and materials.

Claims

1. A glue-free internal fiber optic tube, comprising a housing, with a winding tube disposed inside the housing; characterized in that: The structure of the winding cylinder includes a sleeve, an inner baffle, an outer baffle, a damping seat, an inner shaft, and elastic damping brushes. The two ends of the sleeve are fixedly connected to the inner baffle and the outer baffle, respectively. The inner end of the damping seat is fixed in the center hole of the outer baffle. The inner shaft is located inside the sleeve, and the inner end of the inner shaft is fixedly connected to the inner baffle. The outer end of the inner shaft passes through the cavity of the damping seat. The conical transition section on the inner shaft forms a wire outlet channel with the inner end cavity wall of the damping seat. The edges of the inner port of the damping seat and the outer end of the inner shaft that contact the optical fiber are arc transition surfaces. The arc transition surfaces generate frictional resistance to the optical fiber. The elastic damping brushes are circumferentially distributed on the inner wall of the outer end of the damping seat. The elastic damping brushes apply radial clamping force to the optical fiber.

2. The glue-free internal fiber optic tube according to claim 1, characterized in that: The outer shell has the following structure: it includes a cylindrical body and a cylindrical cover, which are fixedly connected; the inner end of the cylindrical cover is hollow and inverted conical, the outer end of the cylindrical cover is cylindrical pipe, and the transition between the inner and outer ends of the cylindrical cover is an arc transition surface.

3. The glue-free internal fiber optic tube according to claim 1 or 2, characterized in that: Weight reduction grooves are distributed on the outer end faces of the inner and outer baffles.

4. The glue-free internal fiber optic tube according to claim 3, characterized in that: The inner end of the damping seat is a convex stop, and the center hole on the outer baffle is a concave stop. The inner end of the damping seat and the center hole on the outer baffle are interference fit.

5. The glue-free internal fiber optic tube according to claim 1, 2, or 4, characterized in that: The inner shaft is a hollow structure.

6. The glue-free internal fiber optic tube according to claim 5, characterized in that: The cylinder cover has an optical fiber outlet at its outlet end, and a protective cover is provided at the outlet end of the optical fiber outlet, with an optical fiber connector inside the protective cover.

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