Optical cable anti-pulling protection device

Abstract

The utility model discloses a kind of optical cable anti-pulling protection devices, including shell, and the optical cable import and export being set on shell. Variable diameter reel mechanism is equipped in shell by central shaft, upper end cap, lower end cap and multiple groups of circumferential slider, slider and the adjusting sliding slot on end cap sliding fit and pass through elastic member to drive slider radial migration. Optical cable import and export inside is equipped with deflection guide roller, outside is equipped with multiple-wheel guide mechanism. When any end of optical cable is pulled, tension overcomes elastic member to drive slider radial contraction, reel diameter reduces, to release coiled optical cable length to provide buffer;After tension disappears, elastic member drives slider reset. The utility model provides buffer by changing optical cable storage form instead of physical displacement, fundamentally avoids the torsion and abrasion of optical cable, and it has self-adapting guide function, significantly improves the security and service life of optical cable under complex working condition.

Description

Technical Field

[0001] This utility model relates to the field of optical cable protection technology, specifically to an optical cable anti-pull protection device. Background Technology

[0002] Optical cables, as a core carrier of modern information transmission, are widely used in communication networks, microseismic monitoring, industrial automation, and national defense. During actual deployment and use, optical cables inevitably encounter external tensile forces, such as equipment movement, geological activity, trampling by people, or ocean currents. The optical fibers inside the cable are made of brittle glass, which has extremely weak tensile strength. Even minute strain can cause the fiber to break or generate micro-bending loss, resulting in signal interruption or data distortion.

[0003] Currently, fiber optic cable tensile protection technologies mainly fall into two categories: The first is reserving a redundant length, which involves coiling a surplus length at the cable termination. While simple, this method has significant drawbacks: the coiled cable is prone to kinking, folding, and compression under stress due to poor release, potentially damaging the optical fiber due to excessively small local bending radii. The second is mechanical buffering devices, such as the fiber optic cable tensile protection device disclosed in Chinese utility model patent CN223436142U. This patent utilizes a rotating sleeve, sliding column, and spring mechanism within a fixed block to achieve rotational buffering when the fiber optic cable is under tension. Specifically, it absorbs impact by sliding the sliding shaft within an arc-shaped groove and the spring's rebound. This design provides multi-directional buffering capabilities to some extent, but it still has limitations: its buffering capacity mainly relies on the spring's extension and contraction stroke, and the buffering length is strictly limited by the mechanical structure's space, making it difficult to cope with long-distance or continuous tensile conditions. Utility Model Content

[0004] The purpose of this invention is to overcome the defects in the existing technology and provide an anti-pull protection device for optical cables.

[0005] To achieve the above objectives, the technical solution of this utility model is to design an anti-pull protection device for optical cables, including an anti-pull unit. The anti-pull unit includes a housing, on which are provided first and second ports for the optical cable to enter and exit. Upper and lower end covers are provided at the upper and lower ends of the housing. Adjustment grooves are evenly arranged circumferentially on the opposing surfaces of the upper and lower end covers. Multiple sets of sliders are arranged between the upper and lower end covers, with both ends of the sliders slidingly engaging with the adjustment grooves. A central shaft is coaxially arranged between the upper and lower end covers. An elastic element is provided between the sliders and the adjustment grooves. A steering device is provided inside the first and second ports, and a guide device is provided outside the first and second ports. By changing the diameter of the cable reel, the length of the optical cable is dynamically supplied or absorbed, achieving non-contact, frictionless length compensation. The optical cable does not need to move significantly in space, fundamentally avoiding twisting and internal wear. Simultaneously, this structure provides a buffer stroke far greater than traditional devices. The elastic element is preferably a spring.

[0006] Specifically, the steering device includes two sets of steering brackets symmetrically arranged on both sides of the openings of the first and second ports. The steering brackets are mounted on the inner wall of the housing, and each bracket has a steering shaft with a steering guide roller fitted onto it. This steering device, consisting of guide rollers, is installed at the entrance of the optical cable into and out of the housing. It effectively solves the problem of severe friction and compression between the optical cable and the port edge due to sudden changes in direction when entering and leaving the variable reel, leading to sheath wear. By transforming the sliding friction between the optical cable and the housing into rolling friction with the guide rollers, it greatly reduces the resistance to entry and exit, protects the optical cable sheath, and makes the entire process smoother.

[0007] Specifically, the guiding device includes guide brackets disposed outside the first and second ports. The guide brackets have cavities inside for the optical cable to pass through, and these cavities communicate with their corresponding first and second ports. At least three sets of guide shafts are evenly arranged circumferentially within the cavities, and guide wheels are mounted on the guide shafts. A multi-wheel guiding device is installed at the ports outside the housing to constrain the optical cable to its central position. This solves the problem of potential uneven wear between the optical cable and the port due to uncertain force direction outside the device, and ensures that the optical cable always enters the device with the optimal bending radius, avoiding micro-bending losses. Regardless of the direction of the tension, the optical cable can be straight and aligned with the center of the port, greatly improving the stress conditions and extending the cable's lifespan. Preferably, the distance between the three guide shafts can be changed by adjusting bolts, thus making it suitable for optical cables of different diameters.

[0008] Furthermore, a guide ring is also provided on the outer side of the guide bracket. The guide ring is preferably made of ceramic or wear-resistant plastic, as the optical cable may scratch the sharp edges of the guide bracket when it finally leaves the device. By providing the guide ring, a smooth transition surface is provided, achieving a seamless and smooth transition of the optical cable from a protected state to a free state.

[0009] Furthermore, a guide roller groove is provided on the outer side of the slider, and at least one guide roller shaft is provided in the guide roller groove. A rolling guide roller is fitted on the guide roller shaft. A freely rotatable rolling guide roller is provided on the contact surface between the slider and the optical cable. This fundamentally solves the problem of sliding friction and wear caused by diameter changes when the optical cable is coiled and released on the slider surface. By transforming the critical sliding friction into rolling friction, the frictional force is reduced to an extremely low level, maximizing the protection of the optical cable sheath, ensuring the long-term reliability of the device, and making the diameter change process exceptionally smooth.

[0010] Furthermore, both ends of the slider are fitted with first bearings, which slide in conjunction with the adjusting groove. Bearings (such as linear bearings or needle roller bearings) are used as the kinematic pair between the slider and the adjusting groove. This further transforms sliding friction into rolling friction, greatly reducing the resistance to slider movement, ensuring that all sliders can move radially easily and synchronously, improving the device's response speed and operational reliability, and preventing damage caused by excessive pulling of the optical cable.

[0011] Furthermore, it also includes a base with a rotating shaft on it, and the central shaft of the anti-tension unit is mounted on the rotating shaft. The anti-tension unit is mounted on the rotating shaft of the base via the central shaft, allowing the entire unit to rotate freely. This makes the entire anti-tension unit a universal joint-like adaptive structure. Regardless of the direction of the tension, the entire unit will automatically rotate and align with the direction of the tension, thus always ensuring that the optical cable enters and exits the device in the optimal straight line, completely avoiding bending damage caused by lateral forces.

[0012] Furthermore, second bearings are provided at both ends of the central shaft, and the second bearings are mounted on the rotating shaft. The second bearings (such as deep groove ball bearings) ensure that the anti-pull unit can rotate omnidirectionally with extreme flexibility and low resistance, so that its self-aligning function can be perfectly realized.

[0013] Optionally, at least two sets of anti-pull units are mounted on the rotating shaft of the base, and a limit baffle is provided between two adjacent anti-pull units, the limit baffle being mounted on the rotating shaft. For scenarios requiring multiple optical cables, the respective anti-pull units can be mounted on the same base, thereby improving the cleanliness of the construction site and facilitating operation.

[0014] Optionally, the guide wheel has a V-shaped or arc-shaped rim, and its surface is covered with a rubber or polyurethane coating. The V-shaped or arc-shaped rim better conforms to and constrains the optical cable, preventing it from slipping out. The rubber or polyurethane coating provides a soft contact surface, increasing friction to prevent slippage and absorbing micro-vibrations, further protecting the optical cable.

[0015] The advantages and beneficial effects of this utility model are as follows: 1. This invention does not use the traditional method of simply reserving redundant length, but dynamically provides buffer length through active and controllable changes in the diameter of the internal coil. The optical cable is coiled in an orderly manner within the device and releases smoothly when subjected to force, completely solving the problems of kinking, folding, and compression caused by poor release when reserving redundant length in the traditional method, and fundamentally preventing damage to the optical fiber caused by excessively small local bending radii.

[0016] 2. Compared to devices such as CN223436142U cited in the background art that rely on limited spring extension stroke, the buffering capacity of this utility model depends on the variation range of the coil diameter and the number of turns of the optical cable, and its potential buffering stroke is much greater than the former. This design breaks through the limitations of traditional mechanical structures on buffering length, can effectively cope with larger amplitude and longer-lasting pulling conditions, and can be used as a spare optical cable to supplement the optical cable length when the terminal equipment is moved, thus having a wider range of applications.

[0017] 3. The device internally utilizes slider guide rollers, steering guide rollers, guide rings, and guide wheel sets to completely transform the sliding friction that the optical cable may encounter during the buffering process into low-resistance rolling friction, greatly reducing sheath wear. Combined with the base's rotating shaft design, the entire unit can adaptively align with the direction of tension, eliminating the risk of sharp bends and twists caused by lateral forces, and ensuring that the optical cable is always in the optimal stress and bending state throughout the entire protection process.

[0018] 4. Lateral tension causing sharp bends in the optical cable at the fixed port of the device is one of the main causes of optical cable damage. This invention addresses this issue by hinged the anti-tension unit to the base's rotating shaft via bearings, allowing it to rotate freely. When the tension comes from a non-port optical cable axial direction, the entire unit automatically and quickly rotates and aligns with the direction of the tension, ensuring the optical cable always enters and exits the device in the straightest possible position. This fundamentally eliminates stress concentration caused by lateral force at the fixed point and solves the port bending problem. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the anti-pull device of this utility model; Figure 2 This is a structural schematic diagram of the anti-pull unit of this utility model; Figure 3 This is a cross-sectional view of the anti-pull unit of this utility model; Figure 4 This is a schematic diagram of the slider of this utility model; Figure 5 This is a half-sectional view of the casing of this utility model; Figure 6 This is a schematic diagram of the structure of the slider of this utility model when it is at its maximum radial direction; Figure 7 This is a schematic diagram of the structure of the slider of this utility model when it is at its minimum radial position.

[0020] In the diagram: 1. Housing; 101. First port; 102. Second port; 2. Optical cable; 3. Central shaft; 4. Upper end cover; 401. Adjusting groove; 5. Lower end cover; 6. Slider; 601. Guide roller groove; 602. Guide roller shaft; 603. Rolling guide roller; 604. First bearing; 7. Elastic element; 8. Steering device; 801. Steering bracket; 802. Steering shaft; 803. Steering guide roller; 9. Guiding device; 901. Guide bracket; 902. Cavity; 903. Guide shaft; 904. Guide wheel; 905. Guide ring; 10. Base; 1001. Rotating shaft; 1002. Limiting baffle; 12. Second bearing. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0022] according to Figures 2-3 As shown, this utility model is an anti-pull protection device for optical cables, including an anti-pull unit. The anti-pull unit includes a housing 1, on which a first port 101 and a second port 102 for optical cables 2 to enter and exit are provided. An upper end cover 4 and a lower end cover 5 are provided at the upper and lower ends of the housing 1. Adjustment grooves 401 are uniformly arranged circumferentially on the opposite surfaces of the upper end cover 4 and the lower end cover 5. Multiple sets of sliders 6 are provided between the upper end cover 4 and the lower end cover 5. The upper and lower ends of the sliders 6 are slidably engaged with the adjustment grooves 401. A central shaft 3 is coaxially arranged between the upper end cover 4 and the lower end cover 5. An elastic element 7 is provided between the sliders 6 and the adjustment grooves 401. A turning device 8 is provided on the inner side of the first port 101 and the second port 102. A guide device 9 is provided on the outer side of the first port 101 and the second port 102.

[0023] The housing 1 of the anti-pull unit is cylindrical, with a first port 101 on one side of its cylindrical wall and a second port 102 on the opposite side below. Both the first port 101 and the second port 102 are through holes for the optical cable 2 to pass through. The upper and lower ends of the housing 1 are open and connected to an upper end cover 4 and a lower end cover 5 by screws, respectively. To ensure sealing, annular grooves can be machined at the mating surfaces of the upper end cover 4 and the lower end cover 5 with the housing 1, and O-rings (not shown in the figure) can be installed to prevent dust and moisture from entering the unit. The upper end cover 4 and the lower end cover 5 are circumferentially and evenly provided with adjusting grooves 401, preferably in groups of 8. The cross-section of the adjusting grooves 401 is preferably "T"-shaped or "convex", but it can also be a simple rectangular groove. A central shaft 3 passes through the central through hole of the upper end cover 4 and the lower end cover 5. The upper ends of the central shaft 3 can be fixed to the upper end cover 4 and the lower end cover 5 by threads or interference fit, thereby forming a rigid frame structure with the upper and lower end covers. The central axis 3 serves as the central reference for the entire device.

[0024] like Figure 4 As shown, a guide roller groove 601 is provided on the outer side of the slider 6, and at least one guide roller shaft 602 is provided in the guide roller groove 601. A rolling guide roller 603 is fitted on the guide roller shaft 602. First bearings 604 are fitted at both the upper and lower ends of the slider 6, and the first bearings 604 slide in cooperation with the adjusting groove 401. Multiple sliders 6 are arranged in the space enclosed by the upper end cover 4, the lower end cover 5, and the housing 1, and are located around the central shaft 3. The upper and lower end faces of the slider 6 are respectively embedded in the adjusting grooves 401 of the upper end cover 4 and the lower end cover 5. To achieve smooth sliding, as... Figure 4 As shown, first bearings 604 are press-fitted onto both the upper and lower end faces of slider 6. The first bearing 604 is preferably a linear bearing, with its outer ring contacting and fitting with the sidewall and bottom surface of the adjusting groove 401. As a more economical alternative, the first bearing 604 can also be a self-lubricating sliding bushing made of copper-based or polymer composite material. During assembly, an appropriate amount of grease should be applied to the contact surfaces of the adjusting groove 401 and the first bearing 604 to reduce friction and wear.

[0025] like Figure 4 As shown, a guide roller groove 601 is machined on the outer surface of each slider 6. A guide roller shaft 602 passes through the mounting holes on both sides of the guide roller groove 601 and is fixed by a snap ring or a shaft retainer. A freely rotatable rolling guide roller 603 is mounted on the guide roller shaft 602. The outer surface of the rolling guide roller 603 is preferably hardened and polished to further reduce the coefficient of friction.

[0026] like Figure 3As shown, the elastic element 7 is disposed between the slider 6 and the adjusting groove 401. The elastic element 7 is preferably a cylindrical helical compression spring, one end of which rests on a specially machined spring seat at the end of the adjusting groove 401, and the other end rests on a corresponding recess or spring seat at the end of the slider 6. The preload and spring constant of the spring need to be precisely calculated and selected based on the allowable tensile force of the optical cable 2 to be protected and the required buffer stroke. As another embodiment of the elastic element 7, a tension spring can also be used, with its installation position opposite to that of the spring, closer to the outside.

[0027] like Figure 5 As shown, the steering device 8 includes two sets of steering brackets 801 symmetrically arranged on both sides of the openings of the first port 101 and the second port 102. The steering brackets 801 are mounted on the inner wall of the housing 1, and a steering shaft 802 is mounted on each steering bracket 801. A steering guide roller 803 is fitted onto the steering shaft 802. Inside the first port 101 and the second port 102, i.e., inside the housing 1, a steering device 8 is provided in each location. Figure 5 As shown, each steering device 8 includes two steering brackets 801, which are symmetrically fixed to the inner walls of the housing 1 on both sides of the port. A steering shaft 802 is mounted on each steering bracket 801, and a steering guide roller 803 is fitted onto the steering shaft 802. The steering guide roller 803 can rotate freely around the steering shaft 802. The gap formed between the two steering guide rollers 803 is precisely aligned with the center of the port, forming the channel for the optical cable 2.

[0028] like Figure 5 As shown, the guiding device 9 includes a guide bracket 901 disposed outside the first port 101 and the second port 102. The guide bracket 901 has a cavity 902 inside for the optical cable 2 to pass through. The cavity 902 communicates with its corresponding first port 101 and second port 102. At least three sets of guide shafts 903 are evenly arranged circumferentially inside the cavity 902, and guide wheels 904 are disposed on the guide shafts 903. A guide ring 905 is also disposed outside the guide bracket 901. A set of guiding devices 9 is installed on the outer side of each of the first port 101 and the second port 102. Figure 5As shown, the guiding device 9 includes a guide bracket 901, which can be fixed to the outer wall of the housing 1 by threaded connection or snap-fit ​​connection. The guide bracket 901 has a through cavity 902 inside, which is concentric with the corresponding port. Within the cavity 902, at least three sets of guide shafts 903 are circumferentially evenly arranged. Each set of guide shafts 903 is fitted with a freely rotatable guide wheel 904. The rim of the guide wheel 904 is preferably V-shaped, and its inclined surface can fit well with the surface of the optical cable 2. The wheel body of the guide wheel 904 is composed of a metal core and an outer rubber or polyurethane layer; the soft outer layer protects the optical cable and provides sufficient friction. At the outer entrance of the guide bracket 901, a guide ring 905 is also installed. The inner hole of the guide ring 905 has a smooth flared opening to facilitate the introduction of the optical cable.

[0029] like Figure 1 As shown, it also includes a base 10, on which a rotating shaft 1001 is mounted. The central shaft 3 of the anti-pull unit is fitted onto the rotating shaft 1001. Second bearings 12 are provided at both ends of the central shaft 3, and the second bearings 12 are fitted onto the rotating shaft 1001. At least two sets of anti-pull units are mounted on the rotating shaft 1001 of the base 10, and a limiting baffle 1002 is provided between adjacent anti-pull units, the limiting baffle 1002 being fitted onto the rotating shaft 1001. This embodiment, based on Embodiment 1, adds the base 10 and the function of multi-unit stacking. The base 10 has multiple mounting holes at its bottom, allowing it to be fixed to the ground or platform using anchor bolts. A rotating shaft 1001 is vertically fixed on the base 10. The lower end of the central shaft 3 of the anti-pull unit is fitted onto the rotating shaft 1001 via the second bearings 12. The second bearing 12 is preferably a deep groove ball bearing, with its inner ring tightly fitted onto the rotating shaft 1001 and its outer ring tightly fitted into the bearing housing hole at the lower end of the central shaft 3. The upper end of the central shaft 3 is also supported by another second bearing 12. In this way, the entire anti-pull unit can rotate flexibly around the rotating shaft 1001.

[0030] For scenarios requiring multiple optical cables, multiple anti-pull units can be sequentially mounted on the same rotating shaft 1001. Figure 1 (Two are shown). A limiting baffle 1002 is fitted between two adjacent anti-pull units. The limiting baffle 1002 and the rotating shaft 1001 can be fixed by a key connection or interference fit. Its function is to ensure that there is sufficient clearance between the two anti-pull units to prevent them from interfering with each other when rotating. The top of the uppermost anti-pull unit and the bottom of the lowermost anti-pull unit can also be axially locked with nuts and washers to prevent the entire tandem from moving axially.

[0031] Working principle: In the initial state, the optical cable 2 enters through the guide device 9 on one side of the device, and smoothly enters the first port 101 under the guidance of the guide ring 905 and guide wheel 904. Inside the port, it passes between two guide rollers 803 and enters the central region inside the housing 1. The optical cable 2 then wraps around the rolling guide rollers 603 on multiple sliders 6 around the central shaft 3, forming a multi-turn winding state, and then exits from the second port 102 along a symmetrical path, leaving the device via the guide device 8 and guide device 9 on the other side. At this time, all sliders 6 are in the position furthest from the central shaft 3 under the preload of the elastic element 7, and the length of the wound optical cable is at its longest.

[0032] When any end of the optical cable 2, such as the end connected to the device, is subjected to an excessive rightward tension F, this tension is transmitted through the optical cable 2 itself. Since the optical cable 2 is wound around the slider 6 inside the device, this tension forces the optical cable 2 to tighten and generates a radially inward pressure P on the slider located outside the curved section.

[0033] Under the pressure P, the slider 6 overcomes the resistance of its corresponding elastic element 7 and slides radially from its initial position towards the central axis 3 along the adjusting grooves 401 on the upper end cover 4 and the lower end cover 5 until it reaches the appropriate position. This sliding process releases a length ΔL of the optical cable 2 wound on the slider 6. This released length is precisely used to offset the length that external pulling attempts to take away, thereby preventing the optical cable at the equipment connection point from being forcibly pulled. In general, when there is no external force, the preload of the elastic element 7 (such as a spring) keeps the slider 6 at its radially outermost position, forming the maximum coil diameter, and the optical cable is loosely wound. When under tension, the optical cable tension overcomes the spring force, forcing the slider 6 to move radially inward, reducing the coil diameter and releasing the optical cable length for cushioning. After the tension disappears, the spring pushes the slider back to its maximum diameter.

[0034] During this process, most of the work done by the tension F applied to the optical cable 2 is converted into the elastic potential energy stored in the compressive elastic element 7. This is a smooth energy conversion process that effectively suppresses the peak value of the tension. At the same time, the relative movement between the optical cable 2 and the slider 6 is carried out in the form of rolling friction due to the presence of the rolling guide roller 603, resulting in minimal resistance and no damage to the optical cable sheath.

[0035] If the tension F persists but does not cause damage, the slider 6 will remain in an equilibrium position. Once the tension F disappears or is released, the compressed elastic element 7 immediately releases its stored potential energy, pushing the slider 6 to slide outward along the adjusting groove 401, automatically and precisely returning to its initial position.

[0036] If the pull comes from the other end, its working principle is completely symmetrical. If the entire device is subjected to a non-axial pulling force, the entire anti-pull unit can be slightly deflected around the rotation axis 1001 on the base 10, so that the direction of the pulling force is automatically adjusted to the best match with the movement direction of the slider 6, thereby achieving the best protection effect.

[0037] like Figure 6 As shown, at this time, slider 6 is at its maximum radial position, L_max = 2πKR_max; like Figure 7 As shown, at this time, slider 6 is at its minimum radial position, L_min = 2πKR_min; R_max: The radial distance (maximum working radius) from the center of the rolling guide roller 603 to the central shaft 3 when the slider 6 is in the maximum radial expansion position.

[0038] R_min: The radial distance (minimum working radius) from the center of the rolling guide roller 603 to the central shaft 3 when the slider 6 is in the maximum radial contraction position.

[0039] K: The effective number of turns of the optical cable wound on the slider assembly.

[0040] Effective buffer capacity (maximum optical fiber storage capacity) ΔL_max = L_max - L_min.

[0041] The bolts, nuts, screws, welding, etc. used to connect two or more parts in the above-mentioned fixing and installation are all known to those skilled in the art and will not be described in detail here. Similarly, the bearings and lubrication required for components such as guide rollers are also known to those skilled in the art and will not be described in detail here.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A fiber optic cable anti-pull protection device, characterized in that, The device includes an anti-pull unit, which includes a housing (1). The housing (1) is provided with a first port (101) and a second port (102) for the optical cable (2) to enter and exit. The housing (1) is provided with an upper end cover (4) and a lower end cover (5) at its upper and lower ends. The upper end cover (4) and the lower end cover (5) are provided with an adjusting groove (401) circumferentially evenly arranged on their opposite surfaces. Multiple sets of sliders (6) are provided between the upper end cover (4) and the lower end cover (5). The upper and lower ends of the sliders (6) are slidably engaged with the adjusting grooves (401). A central shaft (3) is provided coaxially between the upper end cover (4) and the lower end cover (5). An elastic element (7) is provided between the sliders (6) and the adjusting grooves (401). A steering device (8) is provided inside the first port (101) and the second port (102). A guide device (9) is provided outside the first port (101) and the second port (102).

2. The optical cable anti-pull protection device according to claim 1, characterized in that, The steering device (8) includes two sets of steering brackets (801) symmetrically arranged on both sides of the opening of the first port (101) and the second port (102). The steering brackets (801) are arranged on the inner wall of the housing (1). A steering shaft (802) is arranged on the steering brackets (801), and a steering guide roller (803) is fitted on the steering shaft (802).

3. The optical cable anti-pull protection device according to claim 1, characterized in that, The guiding device (9) includes a guide bracket (901) disposed outside the first port (101) and the second port (102). The guide bracket (901) has a cavity (902) inside for the optical cable (2) to pass through. The cavity (902) is connected to its corresponding first port (101) and second port (102). At least three sets of guide shafts (903) are uniformly arranged circumferentially inside the cavity (902). Guide wheels (904) are disposed on the guide shafts (903).

4. The optical cable anti-pull protection device according to claim 3, characterized in that, A guide ring (905) is also provided on the outside of the guide bracket (901).

5. The optical cable anti-pull protection device according to claim 1, characterized in that, The slider (6) has a guide roller groove (601) on its outer side, and at least one guide roller shaft (602) is provided in the guide roller groove (601), and a rolling guide roller (603) is fitted on the guide roller shaft (602).

6. The optical cable anti-pull protection device according to claim 1, characterized in that, The slider (6) is fitted with a first bearing (604) at both the upper and lower ends, and the first bearing (604) slides in conjunction with the adjusting groove (401).

7. The optical cable anti-pull protection device according to claim 1, characterized in that, It also includes a base (10), on which a rotating shaft (1001) is provided, and the central shaft (3) of the anti-pull unit is fitted on the rotating shaft (1001).

8. The optical cable anti-pull protection device according to claim 7, characterized in that, The central shaft (3) is provided with second bearings (12) at both ends, and the second bearings (12) are mounted on the rotating shaft (1001).

9. The optical cable anti-pull protection device according to claim 7, characterized in that, At least two sets of anti-pull units are mounted on the rotating shaft (1001) of the base (10), and a limit baffle (1002) is provided between two adjacent anti-pull units. The limit baffle (1002) is mounted on the rotating shaft (1001).

10. The optical cable anti-pull protection device according to claim 3, characterized in that, The guide wheel (904) has a V-shaped or arc-shaped rim and a rubber or polyurethane coating on its surface.

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