Asymmetric spiral self-locking protection type butterfly optical cable

Abstract

The present application relates to the technical field of optical cable, in particular to an asymmetric spiral self-locking protection type butterfly optical cable, which comprises a core cable and a sheath wrapping the core cable, the outer wall of the sheath is provided with a thorn layer and a self-locking armor layer in sequence, forming a two-stage anti-bite structure; the self-locking armor layer is connected with the thorn layer through a connecting rod, and the self-locking armor layer triggers instantaneous locking under the oblique pressure of the thorn layer. The self-locking two-stage anti-bite structure of the butterfly optical cable is realized, and the anti-bite performance, tensile strength and bending resistance are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical cable, in particular to an asymmetric spiral self-locking protection type bow optical cable. BACKGROUND

[0002] Bow-type drop cables for access network, Chinese full name is Bow-type drop cables for access network, also known as skin optical cable, is the user drop section core product of fiber to the home (FTTH), fiber to the office (FTTO) and other fiber access networks, mainly applied to the wiring scene of intelligent buildings, digital communities and local area networks.

[0003] The bow optical cable is laid in densely populated areas, which are also areas where rodents gather. Rodents have the habit of gnawing objects to keep their teeth sharp, and are prone to be bitten by rodents and other rodents. The anti-gnawing performance is poor. The existing bow optical cable is prone to cause the internal optical fiber to break during the construction process and the optical fiber to bend when entering the house, which can easily cause internal optical fiber loss, optical fiber breakage and sheath damage, causing the optical cable signal to be interrupted, and ultimately affecting the communication quality.

[0004] In view of this, the present application is proposed. SUMMARY

[0005] The purpose of the present application is to provide an asymmetric spiral self-locking protection type bow optical cable, which realizes a self-locking two-stage bite-proof structure of the bow optical cable, improves the anti-gnawing performance, and improves the anti-tension and anti-bending performance.

[0006] To solve the above technical problems, the present application adopts the following scheme:

[0007] An asymmetric spiral self-locking protection type bow optical cable, comprising a core cable and a sheath wrapping the core cable, an outer wall of the sheath is provided with a thorn layer and a self-locking armor layer in sequence, forming a two-stage bite-proof structure; the self-locking armor layer is connected with the thorn layer through a connecting rod, and the connecting rod is triggered to instantaneously lock under the inclined pressure of the thorn layer.

[0008] Further, the thorn layer comprises a plurality of conical protrusions vertically outward on the outer wall of the sheath, and the height of the conical protrusion is 0.3-0.5mm.

[0009] Further, the armor layer is composed of a first armor made of stainless steel and a second armor, the first armor is located on both sides of the conical protrusion and connected with the connecting rod, and the second armor is located at the first end and the last end of the same horizontal first armors, when the conical protrusion is inclined, the connecting rod is driven to move the first armor to its adjacent first armor or second armor, and the end portions of the two are coincided to form a locked state.

[0010] Further, the outer wall of the sheath is provided with a guide rail movably connected with the first armor, the upper portion of the first armor is provided with a slotted hole moving block, the moving block is clamped on the upper portion of the guide rail, and the two ends of the guide rail are provided with limiting plates, and the length of the limiting plates is greater than the length of the moving block.

[0011] Further, the bottom of the second armor is provided with a fixed rod located on the outer wall of the sheath.

[0012] Further, the two ends of the first armor and the second armor are respectively provided with downward bending part one and upward bending part two, the bending part one and the bending part two of the adjacent first armors and the first armor and the second armor are close to or away from each other, and the two end portions are overlapped when they are close to each other.

[0013] Further, the tapered protrusion, the guide rail and the fixed rod are synchronously co-extruded with the sheath, the two ends of the connecting rod and the side portion of the tapered protrusion are bonded to the surface of the first armor, and the fixed rod is bonded to the second armor.

[0014] Further, the inside of the sheath is symmetrically provided with spiral steel wires with opposite spiral directions, and an asymmetric spiral structure is formed.

[0015] Further, uniform array buffer dispersion cavities are arranged between the spiral steel wires and the core cable, and the buffer dispersion cavities are filled with elastic silica gel balls with a diameter of 0.1-0.3 mm.

[0016] Further, the inner wall of the sheath is provided with a plurality of groups of annular array V-shaped grooves, and the angle of the V-shaped grooves is 30°-60°.

[0017] The beneficial effects of the present application are:

[0018] In the first aspect, the outer wall of the sheath is provided with a thorn layer as a first anti-biting structure, the tapered protrusions are vertically radiated around the outer wall of the sheath, and the direct biting of the sheath is prevented; the self-locking armor layer is a second anti-biting structure, when the tapered protrusions are tilted due to biting, the connecting rod drives the connecting rod to move on the guide rail through the moving block, so that the first armor moves, the bending part one and the bending part two in the adjacent first armors are close to each other, or the bending part one or the bending part two of the first armor is close to the bending part two or the bending part one of the second armor, and the bending part one is located above the bending part two to form a closed state during the close process, so as to block the further biting of the rodents and improve the protection performance.

[0019] In the second aspect, the inside of the sheath is symmetrically provided with spiral steel wires with opposite spiral directions, and an asymmetric spiral structure is formed, the tension in the spiral steel wires is decomposed into axial and tangential components, the sheath wraps the optical fiber, the stress on the optical fiber is reduced, and the tensile strength is improved.

[0020] The third aspect is that the buffer dispersion cavity between the spiral steel wire and the optical fiber and the elastic silica gel ball in the buffer dispersion cavity can provide deformation space when the buffer dispersion cavity is deformed to avoid the optical fiber being pressed and prolong the service life of the optical fiber in the core cable. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a cross-sectional structure schematic diagram of the butterfly optical cable of the present application.

[0022] Figure 2 It is a top view structure schematic diagram of the butterfly optical cable of the present application.

[0023] Figure 3 It is a structure schematic diagram of the self-locking armor layer in a closed state.

[0024] Figure 4 It is a structure schematic diagram of the self-locking armor layer in a closed state. Figure 2 It is a local enlarged structure schematic diagram of the circle A.

[0025] The drawings show that: 1 is a sheath, 10 is a spiral steel wire, 11 is a buffer dispersion cavity, 110 is an elastic silica gel ball, 12 is a V-shaped groove, 13 is a guide rail, 130 is a limiting plate, 14 is a fixed rod, 2 is a core cable, 3 is a thorn layer, 30 is a conical protrusion, 4 is an armor layer, 40 is a first armor, 41 is a second armor, 42 is a moving block, 43 is a bend part one, 44 is a bend part two, and 45 is a connecting rod. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0027] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in the examples are not meant to limit the scope of the present application.

[0028] At the same time, it should be understood that, for the convenience of description, the size of each part shown in the drawings is not drawn in accordance with the actual proportional relationship.

[0029] In addition, in order to be clear and concise, the description of the known structure, function and configuration can be omitted. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of the present disclosure.

[0030] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered part of the specification as appropriate.

[0031] In all of the examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0032] Embodiment 1

[0033] Embodiment 1 of the present application is an asymmetric spiral self-locking protective butterfly optical cable, comprising a core cable 2 and a sheath 1 wrapping the core cable 2, the outer wall of the sheath 1 is provided with a thorn layer 3 and a self-locking armor layer 4 in sequence, forming a two-stage anti-bite structure; the self-locking armor layer 4 is connected with the thorn layer 3 through a connecting rod 45, and triggers instantaneous locking under the inclined pressure of the thorn layer 3.

[0034] Reference Figures 1 to 3 The overall structure of the present butterfly optical cable is the core cable 2, the sheath 1 wrapping the core cable 2, and the reinforcing members on both sides of the sheath 1, and the overall external structure is flat. At the same time, the outer wall of the sheath 1 is provided with a thorn layer 3 for anti-bite, which is used to prevent birds and rodents from biting, and serves as the first anti-bite structure of the butterfly optical cable; and a self-locking armor layer 4 connected with the thorn layer 3 through a connecting rod 45, which is mainly used to receive the bite of the thorn layer 3, and change the vertical state of the outer wall of the sheath 1 to an inclined state, so as to generate a pushing force on the self-locking armor layer 4 through the connecting rod 45, make the self-locking armor layer 4 lock, and thus close the part of the outer wall of the sheath 1 below the bite, prevent birds or rodents from continuing to bite the outer wall of the sheath 1, and serve as the second anti-bite structure of the butterfly optical cable, which solves the problem of poor anti-bite performance of the existing butterfly optical cable, improves the protection performance of the butterfly optical cable, and prevents the optical fiber in the core cable 2 from being damaged by biting and affecting the communication quality.

[0035] As the first anti-bite structure of the butterfly optical cable, the thorn layer 3 comprises a plurality of conical protrusions 30 vertically outward on the outer wall of the sheath 1, and the height of the conical protrusions 30 is 0.3-0.5mm. Figure 1 As shown in the cross-sectional structure diagram of the present butterfly optical cable, it can be known that each conical protrusion 30 is perpendicular to the outer wall of the sheath 1, so that each conical protrusion 30 is vertically radiated around the outer wall of the sheath 1, which is the state without being bitten. At the same time, the conical protrusions 30 are uniformly distributed in the axial and radial directions of the outer wall of the sheath 1, so that the surface of the outer wall of the sheath 1 is protected to improve the anti-bite effect. The height of the conical protrusions 30 can be set according to actual needs within this range, and the spacing between adjacent conical protrusions 30 is not limited in this regard, and can be set according to actual needs to meet the anti-bite function, which is prior art and will not be described here.

[0036] As the second anti-bite structure of the butterfly cable, the armor layer 4 is composed of first armor 40 and second armor 41, the first armor 40 is located on both sides of the conical protrusion 30 and connected with the connecting rod 45, the second armor 41 is located at the beginning and end of the first armor 40 in the same horizontal direction, when the conical protrusion 30 is inclined, the connecting rod 45 is driven to move the first armor 40 to its adjacent first armor 40 or second armor 41, and the end of the two is closed to form a closed state.

[0037] The armor layer 4 in this embodiment has two states, one is a mutual interference state, that is, there is a gap between the ends of the adjacent first armor 40 and the first armor 40 and the second armor 41, this state occurs when the conical protrusion 30 is perpendicular to the outer wall of the sheath 1, and is not bitten, as shown in Figure 1 .

[0038] The other is a closed state, that is, when the conical protrusion 30 is bitten, with the biting of birds or rodents, the conical protrusion 30 will be deformed, causing it to change from a vertical state to an inclined state, after the conical protrusion 30 is inclined, the connecting rod 45 will push the first armor 40 to move, so that the adjacent first armor 40, the end of the first armor 40 and the second armor 41 are overlapped to form a closed state, as shown in Figure 3 , thereby protecting the sheath 1 below the bite.

[0039] It should be noted that when biting occurs, because the size of the beak of birds or rodents is specific, the biting process will cause multiple conical protrusions 30 to be in an inclined state, thereby driving multiple connecting rods 45 to move the first armor 40, thereby forming a closed state, forming the second line of defense against biting. The distance between the adjacent first armors 40 and the distance between the first armor 40 and the second armor 41 are not listed one by one, which does not affect the specific implementation of the anti-bite function.

[0040] Meanwhile, the first and second armor plates 40 and 41 are mainly made of stainless steel material, which can ensure the firmness of protection and prevent birds and rodents from entering the inside of the sheath 1 through the first and second armor plates 40 and 41. The second armor plate 41 is mainly located at any two sides of the four flat surfaces, that is, a plurality of first armor plates 40 at the same level are located between two second armor plates 41, that is, the second armor plate 41 is located at the first end and the last end formed by a plurality of first armor plates 40 at the same level; the sheath 1 in the embodiment is provided with a reverse V-shaped groove on the vertical axis, which divides the surface and the bottom surface into two surfaces, so that the surface and the bottom surface are each provided with four rows of second armor plates 41 for installation on both sides of the cut surface and the bottom surface, thereby providing the first armor plate 40 adjacent to the second armor plate 41 with a locking condition. Meanwhile, the two sides of the conical protrusion 30 are not limited to the lateral sides, but can also be the longitudinal sides of the horizontal plane of the conical protrusion 30, that is, four first armor plates 40 are evenly distributed around the outer periphery of the conical protrusion 30, the first armor plates 40 in the lateral direction are arranged as shown in Figure 1 , and the first armor plates 40 in the horizontal plane longitudinal direction are not shown, which does not affect the implementation of the present application.

[0041] The first armor plate 40 receives the inclined pressure from the conical protrusion 30 through the connecting rod 45 and moves, and the movement mainly consists of: the outer wall of the sheath 1 is provided with a guide rail 13 movably connected with the first armor plate 40, the upper side of the first armor plate 40 is provided with a slotted hole moving block 42, the moving block 42 is clamped above the guide rail 13, and the two ends of the guide rail 13 are provided with limit plates 130, and the length of the limit plate 130 is greater than the length of the moving block 42.

[0042] Referring to Figure 4 , the guide rail 13 provides a condition for the movement of the first armor plate 40, so that the first armor plate 40 moves along the guide rail 13 in the inclined direction, so that the adjacent first armor plate 40 end or the first armor plate 40 and the second armor plate 41 end close to contact to occur in a locked state for protection. The movement of the first armor plate 40 above the guide rail 13 is mainly through the moving block 42 provided at the bottom of the first armor plate 40, the bottom of the moving block 42 is provided with a groove matched with the width of the guide rail 13, the moving block 42 is clamped above the guide rail 13 through the groove, and the two ends of the guide rail 13 are provided with limit plates 130 to prevent the first armor plate 40 from being separated from the guide rail 13, Figure 4 , the dashed line in the figure indicates the assembly structure diagram of the moving block 42 above the guide rail 13.

[0043] Meanwhile, the bottom of the second armor plate 41 is provided with a fixed rod 14 located on the outer wall of the sheath 1. The second armor plate 41 is fixedly connected through the fixed rod 14, so that the position of the second armor plate 41 is fixedly arranged, thereby providing the first armor plate 40 adjacent thereto with a locking condition.

[0044] Embodiment 2

[0045] The first and second armors 40 and 41 are described in this embodiment 2, the two ends of which are respectively provided with the downward bent bend part one 43 and the upward bent bend part two 44, the bend parts one 43 and the bend parts two 44 between the adjacent first armors 40 and between the first and second armors 40 and 41 are close to or away from each other, and the end parts of the two are overlapped when they are close to each other.

[0046] When the first armor 40 in the self-locking armor layer 4 is subjected to the inclined pressure from the conical protrusion 30, movement occurs, the bend part one 43 or the bend part two 44 in the moved first armor 40 is close to and overlapped with the bend part two 44 or the bend part one 43 in the adjacent first or second armor 40 or 41, the bend part one 43 is located above the bend part two 44 to form a locked state, and further biting of the birds or rodents is blocked.

[0047] It should be noted that the conical protrusion 30, the guide rail 13, the fixed rod 14 and the sheath 1 are synchronously co-extruded, the two ends of the connecting rod 45 are bonded to the side of the conical protrusion 30 and the surface of the first armor 40, and the fixed rod 14 is bonded to the second armor 41.

[0048] In the process of co-extruding the sheath 1 with the reinforcing member and the core cable 2, the synchronous co-extrusion of the conical protrusion 30, the guide rail 13 and the fixed rod 14 is also co-extruded, which is a prior art and will not be described here. The two ends of the connecting rod 45 are connected to the conical protrusion 30 and the surface of the first armor 40 by means of adhesive bonding; the second armor 41 is also bonded to the top of the fixed rod 14 by means of adhesive bonding, achieving convenient installation.

[0049] Embodiment 3

[0050] This embodiment 3 is the reinforcing member in embodiment 1, the inside of the sheath 1 is symmetrically provided with the helical steel wires 10 with opposite helical directions, forming an asymmetric helical structure. This reinforcing member is mainly the helical steel wires 10 forming an asymmetric helical structure in the sheath 1, referring to Figure 2 , it is shown that the helical directions of the helical steel wires 10 on both sides in the sheath 1 are opposite, that is, one is clockwise and the other is counterclockwise. When the butterfly cable is subjected to tension, the asymmetric helical structure decomposes the tension into axial and tangential components, the radial compression force makes the sheath 1 wrap the optical fiber, reducing the stress on the optical fiber; the tangential component is converted into a radial compression force to offset part of the torsional force, avoiding the self-rotation of the butterfly cable and improving the tensile strength.

[0051] In order to prevent the optical fiber in the internal core cable 2 from being broken, a uniform array of buffer dispersion cavities 11 is arranged between the spiral steel wire 10 and the core cable 2, the buffer dispersion cavities 11 are filled with elastic silica gel balls 110 with an inner filling diameter of 0.1-0.3 mm. When the butterfly-shaped optical cable is impacted, the elastic silica gel balls 110 are compressed to absorb energy and buffer the stress peak; at the same time, when the buffer dispersion cavities 11 are deformed to provide a deformation space when being bent, the optical fiber is avoided from being pressed, and the service life of the optical fiber in the core cable 2 is prolonged.

[0052] In order to improve the bending resistance of the butterfly-shaped optical cable when being bent, the inner wall of the sheath 1 is provided with a plurality of annular arrays of V-shaped grooves 12, and the angle of the V-shaped grooves 12 is 30°-60°. The direction of the slot of the V-shaped groove 12 is towards the core cable 2, and in the process of bending, the bending space is provided for the bending of the core cable 2, the bending stress is forced to be distributed along the V-shaped groove 12, and local stress concentration is avoided; at the same time, the V-shaped groove 12 guides the optical fiber in the core cable 2 to naturally form a smooth arc line (non-right-angle bending), and the bending resistance is improved.

[0053] The V-shaped grooves 12 are arranged in a plurality of groups along the circumferential direction of the core cable 2 on the inner wall of the sheath 1, each group has a plurality of V-shaped grooves 12, and the spacing between the two adjacent groups of V-shaped grooves 12, the number and spacing of each group of V-shaped grooves 12 are set according to the actual situation, and are not enumerated one by one here.

[0054] The working principle of the present application is that the conical protrusions 30 in the thorn layer 3 are vertically radiated around the outer wall of the sheath 1 as the first anti-biting structure to prevent direct biting of the sheath 1; when the conical protrusions 30 are tilted due to being bitten by birds or rodents, the connecting rod 45 is driven to move the first armor plate 40 to its adjacent first armor plate 40 or second armor plate 41, the movement is mainly through the moving block 42 at the bottom of the first armor plate 40 to be clamped above the guide rail 13, so that the bending part one 43 or the bending part two 44 in the moving first armor plate 40 is close to and coincides with the bending part two 44 or the bending part one 43 in the adjacent first armor plate 40 or second armor plate 41, so that the bending part one 43 is located above the bending part two 44 to form a locked state, blocking the further biting of birds or rodents, and constituting the second anti-biting structure. When the butterfly-shaped optical cable is subjected to tension, the spiral steel wire 10 on both sides of the sheath 1 decomposes the tension into axial and tangential components, so that the sheath 1 wraps the optical fiber, reduces the stress on the optical fiber, and improves the tensile strength; when being bent, the buffer dispersion cavities 11 and the elastic silica gel balls 110 in them between the spiral steel wire 10 and the optical fiber deform to provide a deformation space when being bent, so that the optical fiber is avoided from being pressed, and the service life of the optical fiber in the core cable 2 is prolonged; and the V-shaped grooves 12 provided on the inner wall of the sheath 1 avoid local stress concentration and improve the bending resistance.

[0055] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, as long as it does not deviate from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. An asymmetric spiral self-locking protective butterfly optical cable, characterized in that, The system includes a core cable (2) and a sheath (1) that wraps around the core cable (2). The outer wall of the sheath (1) is sequentially provided with a spike layer (3) and a self-locking armor layer (4) to form a two-level anti-bite structure. The self-locking armor layer (4) is connected to the spike layer (3) through a connecting rod (45) and receives the tilting pressure of the spike layer (3) to trigger instantaneous locking. The spike layer (3) includes multiple conical protrusions (30) that are perpendicular to the outer wall of the sheath (1) and the height of the conical protrusions (30) is 0.3~0.5mm. The armor layer (4) is made of stainless steel. The sleeve (1) consists of a first armor plate (40) and a second armor plate (41). The first armor plate (40) is located on both sides of the conical protrusion (30) and connected to the connecting rod (45). The second armor plate (41) is located at the beginning and end of a plurality of first armor plates (40) at the same level. When the conical protrusion (30) tilts, the connecting rod (45) is driven to move the first armor plate (40) toward its adjacent first armor plate (40) or second armor plate (41), and the ends of the two overlap to form a locked state. The outer wall of the sleeve (1) is provided with a connection to the first armor plate (40). 40) A movable guide rail (13) is connected. A slotted moving block (42) is provided above the first armor plate (40). The moving block (42) is engaged above the guide rail (13), and the two ends of the guide rail (13) are provided with limiting plates (130). The length of the limiting plates (130) is greater than the length of the moving block (42). The bottom of the second armor plate (41) is provided with a fixing rod (14) located on the outer wall of the sleeve (1). The two ends of the first armor plate (40) and the second armor plate (41) are respectively provided with downwardly bent bends (43). The two curved sections (44) bend upwards, the two curved sections (43) and the two curved sections (44) between adjacent first armor plates (40) and between the first armor plate (40) and the second armor plate (41) are close to or far from each other, and their ends overlap when they are close to each other; the conical protrusion (30), the guide rail (13), the fixing rod (14) and the sheath (1) are co-extruded synchronously, the two ends of the connecting rod (45) are bonded to the side of the conical protrusion (30) and the surface of the first armor plate (40), and the fixing rod (14) is bonded to the second armor plate (41).

2. The asymmetric spiral self-locking protective butterfly optical cable according to claim 1, characterized in that, The sheath (1) has symmetrically arranged spiral steel wires (10) with opposite spiral directions inside, forming an asymmetrical spiral structure.

3. The asymmetric spiral self-locking protective butterfly optical cable according to claim 2, characterized in that, A buffer dispersion cavity (11) with a uniform array is provided between the spiral steel wire (10) and the core cable (2), and the buffer dispersion cavity (11) is filled with elastic silicone balls (110) with a diameter of 0.1~0.3mm.

4. An asymmetric spiral self-locking protective butterfly optical cable according to claim 2, characterized in that, The inner wall of the sheath (1) is provided with multiple sets of annular array V-shaped grooves (12), and the angle of the V-shaped grooves (12) is 30°~60°.

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