Optical cable pipe end connection structure and optical cable terminal access device

Abstract

The utility model discloses an optical cable pipe end connection structure and an optical cable terminal access device, and relates to the technical field of optical fiber communication, the optical cable pipe end connection structure is connected with an optical cable terminal box, the optical cable terminal box is provided with a first optical fiber via hole, the optical cable pipe end connection structure comprises a sleeve and an embedded part, an inner cavity of the sleeve is provided with at least two annular steps with different inner diameters, and the annular steps are sequentially distributed in the axial direction of the sleeve; the embedded part is connected with one end of the sleeve, a second optical fiber via hole is formed in the embedded part, the second optical fiber via hole is used for communicating the inner cavity of the sleeve with the inner cavity of the optical cable terminal box, and the embedded part is used for being connected with the inner wall of the first optical fiber via hole in an embedded mode; the inner diameter of each annular step is gradually increased from the end, close to the embedded part, of the sleeve to the end, away from the embedded part, of the sleeve. The optical cable pipe end connection structure can be adapted to optical cable protection pipes with different pipe diameters, and the applicability of the optical cable pipe end connection structure is improved.

Description

Technical Field

[0001] This utility model relates to the field of optical fiber communication technology, and in particular to an optical cable tube end connection structure and an optical cable terminal access device. Background Technology

[0002] In the field of optical fiber communication engineering, in order to improve the service life of optical cables and reduce the risk of damage to optical cables, optical cables are often protected by being run through optical cable protection tubes.

[0003] The optical cable tube end connection structure is a structure used to seal and connect the optical cable protection tube and the optical cable terminal box. One end of the structure is connected to the optical cable protection tube, and the other end is connected to the optical cable terminal box.

[0004] However, different projects use different specifications of optical cable protection pipes, and traditional optical cable pipe end connection structures are often only compatible with a single specification of optical cable protection pipe, resulting in poor applicability. When faced with sealing requirements for multiple specifications of optical cable protection pipes, it is necessary to prepare multiple different models of optical cable pipe end connection structures, which not only increases costs but also makes installation and replacement extremely inconvenient, reducing installation efficiency. Utility Model Content

[0005] The main purpose of this utility model is to propose a fiber optic cable tube end connection structure and a fiber optic cable terminal access device, which aims to improve the applicability of the fiber optic cable tube end connection structure to meet the connection requirements of various specifications of fiber optic cable protection tubes.

[0006] To achieve the above objectives, the present invention proposes an optical cable tube end connection structure, which is connected to an optical cable terminal box. The optical cable terminal box is provided with a first optical fiber via. The optical cable tube end connection structure includes a sleeve and an insert. The inner cavity of the sleeve is provided with at least two annular steps with different inner diameters, and each annular step is distributed sequentially along the axial direction of the sleeve. The insert is connected to one end of the sleeve, and the insert is provided with a second optical fiber via. The second optical fiber via is used to connect the inner cavity of the sleeve with the inner cavity of the optical cable terminal box. The insert is used to fit and connect with the inner wall of the first optical fiber via. The inner diameter of each annular step increases progressively from the end of the sleeve near the insert to the end of the sleeve away from the insert.

[0007] In one embodiment, each of the annular steps is eccentrically arranged, and the projection of the inner wall of each annular step onto the cross-section of the sleeve is tangent to a point.

[0008] In one embodiment, the outer wall of the sleeve is provided with at least two binding grooves, each binding groove corresponding to an annular step.

[0009] In one embodiment, the sleeve is provided with a deformation joint extending along the axial direction of the sleeve, the deformation joint connecting the inner cavity of the sleeve with the external space.

[0010] In one embodiment, the outer wall of the sleeve is provided with at least two binding grooves, each binding groove corresponding to an annular step; each binding groove is located on the side of the sleeve opposite to the expansion joint; and / or, the outer wall of the sleeve is provided with multiple protruding ribs, and two protruding ribs and the outer wall of the sleeve enclose and form a binding groove.

[0011] In one embodiment, the outer wall of the insert is provided with a first snap-fit ​​structure, and the periphery of the first optical fiber via is provided with a second snap-fit ​​structure, wherein the first snap-fit ​​structure is snapped into the second snap-fit ​​structure.

[0012] In one embodiment, one of the first snap-fit ​​structure and the second snap-fit ​​structure is a snap-fit ​​protrusion, and the other is a snap-fit ​​groove.

[0013] In one embodiment, the insert is provided with a plug hole, and the inner wall of the plug hole is provided with a snap-fit ​​hole; the optical cable terminal box is provided with an elastic buckle, the elastic buckle includes an elastic cantilever and a barb provided at the free end of the elastic cantilever, the fixed end of the elastic cantilever is connected to the periphery of the first optical fiber through hole; the elastic cantilever is inserted into the inner wall of the plug hole and the barb is snapped into the inner wall of the snap-fit ​​hole.

[0014] In one embodiment, the optical cable tube end connection structure is an elastic structure.

[0015] This utility model also proposes an optical cable terminal access device, which includes an optical cable terminal box and an optical cable tube end connection structure as described in any of the above embodiments; the side wall of the optical cable terminal box is provided with a first optical fiber through hole, and the insert is fitted and connected to the inner wall of the first optical fiber through hole.

[0016] The optical cable tube end connection structure proposed in this utility model is connected to an optical cable terminal box. The optical cable terminal box is provided with a first optical fiber through hole. The optical cable tube end connection structure includes a sleeve and an insert. The inner cavity of the sleeve is provided with at least two annular steps with different inner diameters, and each annular step is distributed sequentially along the axial direction of the sleeve. The insert is connected to one end of the sleeve and is provided with a second optical fiber through hole. The second optical fiber through hole is used to connect the inner cavity of the sleeve with the inner cavity of the optical cable terminal box. The insert is used to fit and connect with the inner wall of the first optical fiber through hole. The inner diameter of each annular step increases progressively from the end of the sleeve near the insert to the end of the sleeve away from the insert. By setting annular steps of different inner diameters inside the sleeve, and with the inner diameter of each annular step increasing stepwise from the end of the sleeve near the insert to the end of the sleeve away from the insert, a single optical cable tube end connection structure can be adapted to various optical cable protection tubes of different diameters. This improves the applicability of the optical cable tube end connection structure, saves on the cost of optical cable terminal installation and construction, and enhances the convenience of installation operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of an embodiment of the optical cable tube end connection structure provided by this utility model;

[0019] Figure 2 for Figure 1 Another structural diagram of the optical cable conduit end connection structure;

[0020] Figure 3 for Figure 2 A sectional view along line A-A'.

[0021] Figure 4 A schematic diagram of a structural embodiment of the optical cable terminal access device provided by this utility model;

[0022] Figure 5 for Figure 4 Another structural diagram of the optical fiber cable terminal access device;

[0023] Figure 6 for Figure 4 Top view of the optical fiber cable terminal access device;

[0024] Figure 7 for Figure 6 A sectional view along line B-B'.

[0025] Explanation of icon numbers:

[0026] 1000. Optical fiber terminal access device;

[0027] 100. Optical cable conduit end connection structure;

[0028] 1. Sleeve; 1a. Expansion joint; 11. Annular step; 12. Protruding rib; 12a. Binding groove;

[0029] 2. Embedded component; 2a. Snap-fit ​​groove; 2b. Insertion hole; 2c. Snap-fit ​​hole; 2d. Second fiber optic via; 21. Diaphragm; 21a. Annular groove;

[0030] 200, Optical cable terminal box; 200a, First optical fiber through hole; 210, Snap-fit ​​protrusion; 220, Elastic buckle; 221, Elastic cantilever; 222, Barb; 230, Optical cable fixing assembly; 231, Support column; 232, First clamping block; 233, Second clamping block;

[0031] 300. Optical cable protection pipe.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This utility model proposes an optical cable tube end connection structure 100.

[0037] Please see Figures 1 to 3 In one embodiment of this utility model, the optical cable tube end connection structure 100 is connected to the optical cable terminal box 200. The optical cable terminal box 200 is provided with a first optical fiber via 200a. The optical cable tube end connection structure 100 includes a sleeve 1 and an insert 2. The inner cavity of the sleeve 1 is provided with at least two annular steps 11 with different inner diameters. Each annular step 11 is distributed sequentially along the axial direction of the sleeve 1. The insert 2 is connected to one end of the sleeve 1. The insert 2 is provided with a second optical fiber via 2d. The second optical fiber via 2d is used to connect the inner cavity of the sleeve 1 and the inner cavity of the optical cable terminal box 200. The insert 2 is used to fit and connect with the inner wall of the first optical fiber via 200a. The inner diameter of each annular step 11 increases gradually from the end of the sleeve 1 near the insert 2 to the end of the sleeve 1 away from the insert 2.

[0038] In this embodiment, the inner cavity of the sleeve 1 is provided with at least two annular steps 11 with different inner diameters. Each annular step 11 is distributed sequentially along the axial direction of the sleeve 1. The inner diameter of each annular step 11 increases progressively from the end of the sleeve 1 closest to the insert 2 to the end of the sleeve 1 furthest from the insert 2. That is, the larger the inner diameter of the step, the farther away it is from the insert 2, and the smaller the inner diameter of the step, the closer it is to the insert 2. This ensures that optical cable protection tubes 300 of various diameters can be inserted into the sleeve 1 and connected to the corresponding annular step 11. It is understood that the inner diameters of the multiple annular steps 11 can be reasonably set according to the outer diameter of commonly used optical cable protection tubes 300 to ensure that the optical cable protection tube 300 can be inserted without excessive gaps affecting the sealing performance. This embodiment does not limit the inner diameters of the multiple annular steps 11.

[0039] Optionally, the outer diameter of the sleeve 1 can be constant, meaning the entire outer diameter of the sleeve 1 remains unchanged, with multiple annular steps 11 only provided inside the sleeve 1. In this case, the annular steps 11 can be a separate structure from the sleeve 1, or the inner diameter of the sleeve 1 can be changed to form a stepped shape, in which case the annular steps 11 are formed on the inner wall of the sleeve 1. Preferably, the outer diameter of the sleeve 1 can be set to adapt to the multiple steps inside the sleeve 1, that is, the outer wall of the sleeve 1 is set to gradually increase from the end of the sleeve 1 near the insert 2 to the end of the sleeve 1 away from the insert 2, and adapt to the annular steps 11 inside the sleeve 1. Alternatively, uniform pipes of various diameters can be connected sequentially from the end of the sleeve 1 near the insert 2 to the end of the sleeve 1 away from the insert 2, in order of increasing diameter. This variable outer diameter design avoids situations where the difference between the smallest and largest annular steps 11 is too large, resulting in an excessively thick wall of the sleeve 1, which would hinder the deformation of the sleeve 1 to better fit the optical cable protection tube 300 and enhance sealing. For example, a clamp or cable tie can be installed outside the sleeve 1 to tighten it, causing it to deform and fit snugly against the outer wall of the optical cable protection tube 300. In this case, if the wall of the sleeve 1 is too thick, its deformation capacity will be poor, affecting its fit with the optical cable protection tube 300.

[0040] The insert 2 is connected to one end of the sleeve 1. The insert 2 has a second optical fiber via 2d, which communicates with the inner cavity of the sleeve 1. When the insert 2 is installed in the optical cable terminal box 200, the second optical fiber via 2d communicates with the inner cavity of the optical cable terminal box 200. The outer periphery of the insert 2 is fitted into the inner wall of the first optical fiber via 200a. An annular groove or arc-shaped groove adapted to the inner wall of the first optical fiber via 200a can be provided on the outer periphery of the insert 2 to allow the insert 2 to fit into the inner wall of the first optical fiber via 200a. The insert 2 can be cylindrical, block-shaped, or plate-shaped. In this embodiment, the insert 2 is plate-shaped. The periphery of the plate-shaped insert 2 is fitted into the inner wall of the first optical fiber via 200a, and one side of the plate is connected to one end of the sleeve 1. Because the plate-like structure itself can deform relatively significantly in the direction perpendicular to the plate surface, the insert 2 can deform to a certain extent along the length of the sleeve 1 to accommodate the movement of the sleeve 1 caused by friction during the insertion and removal of the optical cable protection tube 300. This gentle deformation of the insert 2 can alleviate the tendency for the insert 2 to come out of the first optical fiber via 200a during the insertion and removal process. Inside the second optical fiber via 2d, a diaphragm 21 is provided. The diaphragm 21 seals the second optical fiber via 2d and connects to its inner wall. The optical cable can penetrate the diaphragm 21 and extend into the inner cavity of the optical cable terminal box 200. The diaphragm 21 has multiple pre-set annular grooves 21a to allow operators to pierce the diaphragm 21 with tools, resulting in a relatively regular opening. The diameter of the multiple pre-set annular grooves 21a is compatible with the diameter of various types of optical cables, ensuring a tight fit between the outer wall of the optical cable and the diaphragm 21, enhancing the sealing performance. The insert 2, sleeve 1 and diaphragm 21 can be integrally molded from materials such as soft silicone rubber.

[0041] In this embodiment, by setting annular steps 11 with different inner diameters inside the sleeve 1, and the inner diameter of each annular step 11 gradually increases from the end of the sleeve 1 near the insert 2 to the end of the sleeve 1 away from the insert 2, a single optical cable tube end connection structure 100 can be adapted to various optical cable protection tubes 300 with different diameters, thereby improving the applicability of the optical cable tube end connection structure 100, saving the cost of optical cable terminal installation and construction, and improving the convenience of installation operations.

[0042] Further, please refer to Figure 2 , Figure 3 and Figure 7 In this new embodiment, each annular step 11 is eccentrically arranged, and the projection of the inner wall of each annular step 11 onto the cross-section of the sleeve 1 is tangent to a point.

[0043] In this embodiment, to secure the optical cable within the optical cable terminal box 200 and prevent damage to the optical components and optical fibers inside the box when the optical cable outside the box is stretched, an optical cable fixing assembly 230 is provided inside the optical cable terminal box 200. The optical cable fixing assembly 230 is positioned corresponding to the first optical fiber via 200a, which is located on the side wall of the optical cable terminal box 200. The optical cable fixing assembly 230 includes a support post 231, a first clamping block 232, and a second clamping block 233. The support post 231 is vertically connected to the bottom wall of the optical cable terminal box 200. The first clamping block 232 and the second clamping block 233 are slidably connected to the support post 231, forming a clamping space between them for holding the optical cable. The first clamping block 232 and the second clamping block 233 are locked to the support post 231 with fastening screws to clamp the optical cable. It should be noted that... Figure 7 To demonstrate the detailed structure of the optical fiber, part of the optical cable was cut off. Therefore, the optical fiber appears to be clamped in the clamping space in the picture, but in reality, the optical cable should be clamped in the clamping space.

[0044] To meet the versatility requirement of the optical cable fixing assembly 230, which can clamp optical cables of any diameter from the largest to the smallest, one clamping block is set to the annular step 11 corresponding to the largest inner diameter, and the other clamping block is movable to adjust the size of the clamping space. If the annular steps 11 are concentrically arranged, when the difference between the annular step 11 with the largest inner diameter and the annular step 11 with the smallest inner diameter is large, the optical cable will be clamped after passing through the smallest annular step 11 and extending into the clamping space. During this process, the optical cable will bend significantly, which may damage the internal optical fiber or affect the optical signal quality. Therefore, in this embodiment, the annular steps 11 are eccentrically arranged, and the projection of the inner wall of each annular step 11 on the cross-section of the sleeve 1 is tangent to a point. This can reduce the step difference between the annular step 11 with the smallest inner diameter and the annular step 11 with the largest inner diameter, and prevent excessive bending of the optical fiber from causing damage or poor signal.

[0045] Further, please refer to Figure 1 and Figure 3 In this new embodiment, the outer wall of the sleeve 1 is provided with at least two binding grooves 12a, and each binding groove 12a corresponds to an annular step 11.

[0046] In this embodiment, to reduce the gap between the annular step 11 and the optical cable protection tube 300, a clamp or binding strap is used to tighten the sleeve 1 so that it fits tightly against the outer wall of the optical cable protection tube 300, thereby improving the sealing performance. Considering that the clamp or binding strap is prone to slippage and loosening when placed on the smooth sleeve 1, this embodiment provides a binding groove 12a on the outer wall of the sleeve 1. The binding groove 12a can be formed by excavating the outer wall of the sleeve 1. The binding groove 12a is correspondingly positioned to the annular step 11 so that the tightening force provided by the binding strap is concentrated on the corresponding annular step 11. The binding groove 12a can limit the slippage of the binding strap relative to the outer wall of the sleeve 1, preventing loosening and ensuring the sealing between the sleeve 1 and the optical cable protection tube 300.

[0047] Further, please refer to Figures 1 to 2 In this new embodiment, the sleeve 1 is provided with a deformation joint 1a extending along the axial direction of the sleeve 1, and the deformation joint 1a connects the inner cavity of the sleeve 1 with the outer space.

[0048] In this embodiment, in order to ensure that the optical cable protection tube 300 can be smoothly and quickly inserted into the sleeve 1, the sleeve 1 is provided with a deformation slit 1a extending along the axial direction of the sleeve 1. The deformation slit 1a connects the inner cavity of the sleeve 1 with the external space. The existence of the deformation slit 1a makes the sleeve 1 more likely to deform to a certain extent. For example, the sleeve 1 can deform outward to expand the width of the deformation slit 1a so that the optical cable protection tube 300 can be inserted. Under the binding action of the binding strap, the sleeve 1 can deform inward to compress the width of the deformation slit 1a and improve the sealing performance.

[0049] Further, please refer to Figures 1 to 3 In this new embodiment, the outer wall of the sleeve 1 is provided with at least two binding grooves 12a, each binding groove 12a is provided with a corresponding annular step 11; each binding groove 12a is located on the side of the sleeve 1 away from the deformation joint 1a; and / or, the outer wall of the sleeve 1 is provided with a plurality of protruding ribs 12, and two protruding ribs 12 and the outer wall of the sleeve 1 enclose a binding groove 12a.

[0050] In this embodiment, considering that excavating and setting the binding groove 12a on the outer wall of the sleeve 1 would weaken the wall thickness of the sleeve 1 and reduce the structural strength, this method is not convenient when the sleeve 1 itself is thin. Therefore, this embodiment proposes to provide multiple protruding ribs 12 on the outer wall of the sleeve 1, wherein two protruding ribs 12 and the outer wall of the sleeve 1 enclose and form a binding groove 12a, thus avoiding weakening the structural strength of the sleeve 1. In addition, whether the binding groove 12a is set by setting protruding ribs 12 or by excavation, the sidewall of the binding groove 12a will be subjected to force due to resisting the slippage of the binding tape, etc. In order to avoid the expansion joint 1a dividing and weakening the binding groove 12a, the binding groove 12a is set on the side of the sleeve 1 opposite to the expansion joint 1a. In this way, when the binding groove 12a is subjected to the slippage force, it will not disturb the expansion joint 1a and cause the expansion joint 1a to expand, thus ensuring the sealing of the connection between the sleeve 1 and the optical cable protection pipe 300.

[0051] Further, please refer to Figures 4 to 5 In this new embodiment, the outer wall of the insert 2 is provided with a first snap-fit ​​structure, and the periphery of the first optical fiber via 200a is provided with a second snap-fit ​​structure, and the first snap-fit ​​structure and the second snap-fit ​​structure are snap-fitted together.

[0052] To strengthen the connection between the insert 2 and the inner wall of the first optical fiber via 200a, and to prevent the insert 2 and the sleeve 1 from being pulled out of the optical cable terminal box 200 when the optical cable protection tube 300 is disassembled, the insert 2 is fitted into the inner wall of the first optical fiber via 200a. In this embodiment, a first snap-fit ​​structure is provided on the outer wall of the sleeve 1 on the insert 2, and a second snap-fit ​​structure that cooperates with the first snap-fit ​​structure is provided around the periphery of the first optical fiber via 200a, thereby preventing the insert 2 from detaching from the optical cable terminal box 200. Optionally, an annular groove 21a, i.e., a second snap-fit ​​structure, can be provided on the outer periphery of the first fiber optic via 200a facing the inner cavity of the optical cable terminal box 200. An annular boss that cooperates with the sliding groove is provided on the periphery of the insert 2, i.e., a first snap-fit ​​structure. The diameter of the first fiber optic via 200a can be set to be sufficient for the sleeve 1 and the insert 2 to pass through, and to prevent the annular boss from passing through. In this way, the sleeve 1 and the insert 2 can be passed out from the optical cable terminal box 200 and the annular boss can be snapped with the inner wall of the annular groove 21a to realize the fitting connection between the insert 2 and the first fiber optic via 200a.

[0053] Further, please refer to Figures 4 to 5 In this new embodiment of the utility model, in the first snap-fit ​​structure and the second snap-fit ​​structure, one of them is a snap-fit ​​protrusion 210, and the other is a snap-fit ​​groove 2a.

[0054] In this embodiment, an arc-shaped snap-fit ​​protrusion 210 extending circumferentially along the first fiber optic via 200a is provided on the inner wall of the first fiber optic via 200a, which is the second snap-fit ​​structure. An arc-shaped snap-fit ​​groove 2a adapted to the snap-fit ​​protrusion 210 is provided on the outer peripheral wall of the insert 2, which is the first snap-fit ​​structure. The insert 2 and the first fiber optic via 200a are connected by the engagement of the snap-fit ​​groove 2a and the snap-fit ​​protrusion 210. It can be understood that the positions of the snap-fit ​​protrusion 210 and the snap-fit ​​groove 2a can be interchanged. Therefore, in the first snap-fit ​​structure and the second snap-fit ​​structure, one is the snap-fit ​​protrusion 210 and the other is the snap-fit ​​groove 2a.

[0055] Further, please refer to Figures 4 to 5 In this new embodiment, the insert 2 is provided with a plug hole 2b, and the inner wall of the plug hole 2b is provided with a snap-fit ​​hole 2c; the optical cable terminal box 200 is provided with an elastic buckle 220, the elastic buckle 220 includes an elastic cantilever 221 and a barb 222 provided at the free end of the elastic cantilever 221, the fixed end of the elastic cantilever 221 is connected to the periphery of the first optical fiber through hole 200a; the elastic cantilever 221 is plugged into the inner wall of the plug hole 2b and the barb 222 is snapped into the inner wall of the snap-fit ​​hole 2c.

[0056] To strengthen the connection between the insert 2 and the optical cable terminal box 200 and prevent the insert 2 from easily loosening after installation in the optical cable terminal box 200, in this embodiment, the optical cable terminal box 200 has a bottom box and a cover. The side wall of the bottom box is provided with a first optical fiber through hole 200a. The side of the first optical fiber through hole 200a away from the bottom wall of the bottom box is provided with a notch. The side of the first optical fiber through hole 200a near the bottom wall of the bottom box is provided with a snap-fit ​​protrusion 210. The bottom of the insert 2 is provided with a snap-fit ​​groove 2a. The insert 2 can slide into the first optical fiber through hole 200a from the notch along the direction from the top of the bottom box to the bottom of the bottom box, so that the snap-fit ​​protrusion 210 snaps into the inner wall of the snap-fit ​​groove 2a. The top of the base box is provided with a vertically arranged elastic buckle 220. The elastic buckle 220 includes an elastic cantilever 221 and a barb 222 provided at the free end of the elastic cantilever 221. The fixed end of the elastic cantilever 221 is connected to the periphery of the first optical fiber through hole 200a. The insert 2 is provided with a plug hole 2b that is adapted to the elastic buckle 220. The plug hole 2b extends vertically. A snap hole 2c is provided on the inner wall of the plug hole 2b. When the insert 2 slides into the first optical fiber through hole 200a from the notch so that the snap protrusion 210 snaps into the inner wall of the snap groove 2a, the elastic cantilever 221 is inserted into the plug hole 2b and the barb 222 snaps into the inner wall of the snap hole 2c to lock it. It is understood that the above is only an exemplary example of this embodiment. The positions of the elastic buckle 220, the insertion hole 2b, and the locking hole 2c can be adjusted according to actual needs. For example, the elastic buckle 220 can be set on the inner side wall of the bottom box and parallel to the bottom wall of the bottom box. Correspondingly, the insertion hole 2b is adapted to be consistent with the extension direction of the elastic buckle 220. At the first optical fiber through hole 200a, the sleeve 1 can be passed out from the bottom box until the embedded part 2 abuts against the periphery of the first optical fiber through hole 200a. At this time, the elastic buckle 220 is inserted into the insertion hole 2b so that the barb 222 is locked with the locking hole 2c. In this way, the connection between the embedded part 2 and the optical cable terminal box 200 is strengthened, preventing the embedded part 2 from easily loosening after being installed in the optical cable terminal box 200, and preventing the embedded part 2 and the sleeve 1 from being pulled out of the optical cable terminal box 200 when the optical cable protection tube 300 is removed.

[0057] Furthermore, in this new embodiment of the utility model, the optical cable tube end connection structure 100 is an elastic structure.

[0058] In this embodiment, to ensure the airtight connection between the optical cable tube end connection structure 100 and the optical cable protection tube 300 and the optical cable terminal box 200, the optical cable tube end connection structure 100 is made of an elastically deformable material. Through elastic deformation, the optical cable tube end connection structure 100 fits tightly against the outer wall of the optical cable protection tube 300 and the inner wall of the first optical fiber via 200a, thus ensuring the airtight connection between the optical cable tube end connection structure 100 and the optical cable protection tube 300 and the optical cable terminal box 200. For example, the optical cable tube end connection structure 100 can be made of silicone rubber, nitrile rubber, or other materials.

[0059] The present invention also proposes an optical cable terminal access device 1000, which includes an optical cable terminal box 200 and an optical cable tube end connection structure 100 as described in any of the above embodiments; the side wall of the optical cable terminal box 200 is provided with a first optical fiber through hole 200a, and the insert 2 is fitted and connected to the inner wall of the first optical fiber through hole 200a.

[0060] The specific structure of the optical cable tube end connection structure 100 is as described in the above embodiments. Since the optical cable terminal access device 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0061] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An optical cable tube end connector structure connected to an optical cable terminal box (200), wherein a first optical fiber via hole (200a) is provided on the optical cable terminal box (200), characterized in that, The optical cable tube end connection structure comprises: a sleeve (1), an inner cavity of the sleeve (1) is provided with at least two annular steps (11) with different inner diameters, each annular step (11) is sequentially distributed along the axial direction of the sleeve (1); and an embedded part (2) connected with one end of the sleeve (1), the embedded part (2) is provided with a second fiber hole (2d), the second fiber hole (2d) is used for connecting the inner cavity of the sleeve (1) with the inner cavity of the optical cable terminal box (200), and the embedded part (2) is used for embeddedly connecting with the inner wall of the first fiber hole (200a). Wherein, the inner diameter of each annular step (11) gradually increases from the end of the sleeve (1) close to the embedded part (2) to the end of the sleeve (1) away from the embedded part (2).

2. The optical cable tube end connector structure of claim 1, wherein, Each annular step (11) is eccentrically arranged, and the projection of the inner wall of each annular step (11) on the cross section of the sleeve (1) is tangent to a point.

3. The optical cable tube end connector structure of claim 1, wherein, The outer wall of the sleeve (1) is provided with at least two binding grooves (12a), each binding groove (12a) is arranged corresponding to one annular step (11).

4. The optical cable tube end connector structure of claim 1, wherein, The sleeve (1) is provided with a deformation seam (1a) extending along the axial direction of the sleeve (1), and the deformation seam (1a) connects the inner cavity of the sleeve (1) with the external space.

5. The optical cable tube end connector structure of claim 4, wherein, The outer wall of the sleeve (1) is provided with at least two binding grooves (12a), each binding groove (12a) is arranged corresponding to one annular step (11); Each binding groove (12a) is located on the side of the sleeve (1) away from the deformation seam (1a); And / or, the outer wall of the sleeve (1) is provided with a plurality of convex ribs (12), two convex ribs (12) and the outer wall of the sleeve (1) form a binding groove (12a).

6. The optical cable tube end connector structure of claim 1, wherein, The outer side wall of the embedded part (2) is provided with a first clamping structure, the periphery of the first fiber hole (200a) is provided with a second clamping structure, and the first clamping structure and the second clamping structure are clamped.

7. The optical cable tube end connector structure of claim 6, wherein One of the first clamping structure and the second clamping structure is a clamping protrusion (210), and the other is a clamping groove (2a).

8. The optical cable tube end connector structure of claim 1, wherein, The embedded part (2) is provided with a plug hole (2b), and the inner wall of the plug hole (2b) is provided with a clamping hole (2c); The optical cable terminal box (200) is provided with an elastic buckle (220), the elastic buckle (220) comprises an elastic cantilever (221) and a barb (222) arranged at the free end of the elastic cantilever (221), and the fixed end of the elastic cantilever (221) is connected with the periphery of the first fiber hole (200a); The elastic cantilever (221) is plugged with the inner wall of the plug hole (2b), and the barb (222) is clamped with the inner wall of the clamping hole (2c).

9. The optical cable tube end connector structure of claim 1, wherein, The optical cable tube end connection structure is a flexible structure.

10. An optical cable termination access device, characterized by, The optical cable terminal access device comprises an optical cable terminal box (200) and the optical cable tube end connection structure according to any one of claims 1 to 9. The side wall of the optical cable terminal box (200) is provided with a first optical fiber via hole (200a), and the embedded part (2) is connected with the inner wall of the first optical fiber via hole (200a) in a fitting manner.

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