A twist-resistant, butterfly-shaped drop cable and method of manufacture

Abstract

The application discloses a butterfly-shaped lead-in optical cable with torsion and pressure resistance and a manufacturing method, relates to the technical field of optical cables, and can solve the problem of poor torsion resistance of a butterfly-shaped optical cable in the prior art. The application discloses a butterfly-shaped lead-in optical cable with torsion and pressure resistance, which comprises an optical cable main body, the optical cable main body comprises a butterfly-shaped sheath, a pulling reinforcing member and an optical fiber assembly, and further comprises a plurality of anti-torsion and pressure plastic skeletons which are fixed on the pulling reinforcing member in an axial direction through injection molding and which are arranged on the pulling reinforcing member, the anti-torsion and pressure plastic skeletons are in a C shape, and the anti-torsion and pressure plastic skeletons on the two pulling reinforcing members are arranged in a buckling mode. In the case that the optical cable main body is subjected to a torsion or pressure, the two anti-torsion and pressure plastic skeletons are close to each other and in a combined state, the two pulling reinforcing members and the two anti-torsion and pressure plastic skeletons form an anti-torsion and pressure cage, and the optical fiber assembly is located at a central position of the anti-torsion and pressure cage. In the case that the optical cable main body is subjected to a radial tension, the two anti-torsion and pressure plastic skeletons can be far away from each other and in a separated state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical cable, in particular to a butterfly-shaped drop cable with torsion and pressure resistance and a manufacturing method. BACKGROUND

[0002] The butterfly-shaped drop cable is based on its unique groove design and two parallel reinforcing members on both sides of the groove structure, so that the operator does not need to use other tools when stripping the butterfly-shaped sheath and exposing the optical fiber unit, and at the same time, it can ensure that the butterfly-shaped drop cable has sufficient tensile strength to avoid the optical fiber unit from being broken during the laying process, and it is an excellent optional cable product in the full optical networking mode.

[0003] However, the actual construction environment of the existing butterfly-shaped drop cable during construction and laying is often very complex. For example, when the butterfly-shaped drop cable is laid in the pipeline or through hole, due to its flat shape, it is easy to be twisted and deformed when encountering obstacles during the process. Once the amount of twisting and deformation is too large, the twisting and deformation will be transmitted to the optical fiber unit, thereby increasing the optical attenuation coefficient of the optical fiber body. In addition, the optical fiber unit of the existing butterfly-shaped drop cable is between the two pulling reinforcing members, and the pressure resistance is not good. Therefore, a new type of butterfly-shaped drop cable with torsion and pressure resistance is needed, which does not affect the easy tearing characteristics of the butterfly-shaped drop cable.

[0004] Based on the above background, the inventors have designed a butterfly-shaped drop cable with torsion and pressure resistance and a manufacturing method to solve at least one of the above problems, and thus the present application is proposed. SUMMARY

[0005] The purpose of the present application is to provide a butterfly-shaped drop cable with torsion and pressure resistance and a manufacturing method to solve the problem of poor torsion resistance of the existing butterfly-shaped drop cable.

[0006] To solve the above problems, the present application provides the following technical solutions:

[0007] On the one hand, the present application provides a butterfly-shaped drop cable with torsion and pressure resistance, which comprises a cable main body, the cable main body comprising a butterfly-shaped sheath and two pulling reinforcing members arranged in the butterfly-shaped sheath and parallel to each other, and an optical fiber assembly located between the two pulling reinforcing members, and further comprising a plurality of anti-torsion and pressure plastic skeletons fixed on the pulling reinforcing members in the axial direction, the anti-torsion and pressure plastic skeletons being C-shaped, and the anti-torsion and pressure plastic skeletons on the two pulling reinforcing members being arranged in a clamping manner.

[0008] The two anti-torsion and pressure plastic skeletons have a combined state and a separated state.

[0009] In the case that the optical cable body is subjected to torsion or pressure, the two torsion-resistant plastic skeletons are close to each other in a combined state, the two pulling strength members and the two torsion-resistant plastic skeletons form a torsion-resistant and pressure-resistant cage, and the optical fiber assembly is located at the center of the torsion-resistant and pressure-resistant cage.

[0010] In the case that the optical cable body is subjected to radial tension, the two torsion-resistant plastic skeletons can be away from each other in a separated state.

[0011] Optionally, the torsion-resistant plastic skeleton comprises an integrally injection-molded mounting seat and two curved rods, and a top-pressing convex rod and a top-pressing concave rod respectively located at the end of the two curved rods.

[0012] The mounting seat is sleeved and fixed on the pulling strength member, the side of the top-pressing convex rod away from the curved rod is provided with a convex structure, and the side of the top-pressing concave rod away from the curved rod is provided with a concave structure.

[0013] The middle part of the optical cable body is provided with two tearing grooves, in the case that the two torsion-resistant plastic skeletons are buckled, the convex structure of the top-pressing convex rod is located in the concave structure of the top-pressing concave rod, and the planes on the opposite sides of the top-pressing convex rod and the top-pressing concave rod coincide with the tearing surface formed by the two tearing grooves.

[0014] Optionally, the cross-sectional shape of the mounting seat is a circular ring or a C shape.

[0015] Optionally, it further comprises a connecting segment structure located between adjacent mounting seats, or / and, adjacent top-pressing convex rods, or / and, adjacent top-pressing concave rods.

[0016] Two axially adjacent mounting seats along the pulling strength member are connected by the connecting segment structure to form an integrated structure, or / and, two axially adjacent top-pressing convex rods along the pulling strength member are connected by the connecting segment structure to form an integrated structure, or / and, two axially adjacent top-pressing concave rods along the pulling strength member are connected by the connecting segment structure to form an integrated structure.

[0017] A plurality of torsion-resistant plastic skeletons distributed along the axis of the pulling strength member are connected by the connecting segment structure to form an integrated structure.

[0018] Optionally, two axially adjacent mounting seats, two top-pressing convex rods, and two top-pressing concave rods along the pulling strength member are connected and fixed by the connecting segment structure.

[0019] It further comprises a pressure cutting piece structure located on the side of the top-pressing convex rod or / and the top-pressing concave rod facing the optical fiber assembly, and the pressure cutting piece structure coincides with the tearing surface formed by the two tearing grooves.

[0020] Optionally, the pressure cutting piece structure comprises an integrally formed knife body segment and a knife edge segment.

[0021] The optical fiber assembly comprises a loose sheath and a plurality of optical fiber units arranged in the loose sheath;

[0022] The height of the knife edge section is equal to the wall thickness of the loose sheath;

[0023] The knife edge section and the knife body section have a blocking plane for blocking the knife edge section from continuing to cut down;

[0024] The distance between the knife edge section and the optical fiber assembly ranges from 1 mm to 3 mm.

[0025] Optionally, the top pressing convex rod and the top pressing concave groove rod are each provided with a pressing piece structure;

[0026] The two pressing piece structures are used to apply a circumferentially separating separation force to the optical fiber assembly when the optical fiber assembly is axially pressed by the pulling strength member.

[0027] Optionally, the pressing piece structures are arranged at intervals along the axial direction of the pulling strength member, the length of the pressing piece structure along the axial direction of the pulling strength member ranges from 3 cm to 7 cm, and the interval between adjacent pressing piece structures ranges from 20 cm to 80 cm.

[0028] Optionally, the two anti-twist plastic skeletons arranged in a buckle are elliptical.

[0029] The free end of the anti-twist plastic skeleton is located at an intermediate position between the tear groove and the optical fiber assembly.

[0030] In another aspect, the application provides a manufacturing method of the anti-twist butterfly-shaped drop cable as described above, comprising the following steps:

[0031] S1, injection molding the anti-twist plastic skeleton on the pulling strength member, and waiting for cooling and molding;

[0032] S2, after the optical fiber assembly is arranged in the anti-twist skeleton cage formed by the two pulling strength members and the two anti-twist plastic skeletons, the butterfly-shaped drop cable product is discharged from the extruder together with the extruded butterfly-shaped sheath.

[0033] The application has the following beneficial effects:

[0034] The application is characterized in that the torsion-resistant plastic skeletons in a C shape are fixed on the pulling reinforcing members by injection molding, and the two torsion-resistant plastic skeletons are arranged in a buckling mode, so that when the butterfly-shaped lead-in optical cable is slightly twisted and deformed under a torque, the two pulling reinforcing members and the two torsion-resistant plastic skeletons are connected into a torsion-resistant and pressure-resistant cage in a combined state, thereby resisting the torque as a whole, that is, the core idea of the application is that the original pulling reinforcing members in a mutual independent state are connected with the torsion-resistant and pressure-resistant plastic skeletons arranged in a buckling mode to form a torsion-resistant and pressure-resistant cage in a combined state, thereby forming a whole structure for resisting the torque, improving the overall torsion resistance of the butterfly-shaped lead-in optical cable, and solving the problem of poor torsion resistance of the butterfly-shaped lead-in optical cable in the prior art.

[0035] In addition, since the torsion-resistant and pressure-resistant cage is in a combined state only when it is subjected to a torsion force or a pressure, the butterfly-shaped optical cable can be easily separated after being subjected to a radial tension force perpendicular to the axial direction of the pulling reinforcing member, and the operation of stripping the optical fiber unit by the operator is not affected, that is, the torsion resistance of the butterfly-shaped lead-in optical cable can be greatly improved without affecting the easy tearing property of the butterfly-shaped lead-in optical cable.

[0036] The application is characterized in that the torsion-resistant and pressure-resistant cage is in a combined state only when it is subjected to a torsion force or a pressure, and the butterfly-shaped optical cable can be easily separated after being subjected to a radial tension force perpendicular to the axial direction of the pulling reinforcing member, and the operation of stripping the optical fiber unit by the operator is not affected, that is, the torsion resistance of the butterfly-shaped lead-in optical cable can be greatly improved without affecting the easy tearing property of the butterfly-shaped lead-in optical cable. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 FIG. 1 is a structural schematic view of the application.

[0038] Figure 2 FIG. 1 is a structural schematic view of the application.

[0039] Figure 3 is a structural schematic view of embodiment 2 of the present application.

[0040] Figure 4 is a structural schematic view of embodiment 2 of the present application from above after removing the butterfly-shaped sheath.

[0041] Figure 5 is a structural schematic view of embodiment 2 of the present application from above before peeling off the butterfly-shaped sheath, and pressing the butterfly-shaped sheath to make the loose sheath be cut open.

[0042] Figure 6 is a structural schematic view of embodiment 2 of the present application from above. Figure 5 is a local enlarged schematic view at A in the middle.

[0043] Explanation of reference signs:

[0044] 1-butterfly-shaped sheath, 11-tear groove, 2-pulling reinforcing member, 3-optical fiber assembly, 31-loose sheath, 32-optical fiber unit, 4-anti-twist plastic skeleton, 41-mounting seat, 42-bending rod, 43-pressing convex rod, 44-pressing concave rod, 45-cutting piece structure, 451-blade body section, 452-blade edge section, 453-blocking plane. DETAILED DESCRIPTION

[0045] The present application will be further described below in conjunction with embodiments and drawings, but the embodiments of the present application are not limited thereto.

[0046] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "back", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "opened", "mounted", "connected", "linked" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] The present application will be described in detail below by referring to the drawings and in conjunction with embodiments.

[0049] Embodiment 1

[0050] As shown in Figure 1 and Figure 2 , the embodiment provides a butterfly-shaped lead-in optical cable with torsion and pressure resistance, which comprises an optical cable main body, the optical cable main body comprises a butterfly-shaped sheath 1, two pulling reinforcing members 2 arranged in the butterfly-shaped sheath 1 and parallel to each other, and an optical fiber assembly 3 located between the two pulling reinforcing members 2, and further comprises a plurality of torsion and pressure resistant plastic skeletons 4 which are fixed on the pulling reinforcing members 2 in the axial direction by injection molding, the torsion and pressure resistant plastic skeletons 4 are C-shaped, and the torsion and pressure resistant plastic skeletons 4 on the two pulling reinforcing members 2 are arranged in a clamping manner.

[0051] The two torsion and pressure resistant plastic skeletons 4 have a combined state and a separated state.

[0052] In the case that the optical cable main body is subjected to a torsion or a pressure, the two torsion and pressure resistant plastic skeletons 4 are close to each other in the combined state, the two pulling reinforcing members 2 and the two torsion and pressure resistant plastic skeletons 4 form a torsion and pressure resistant cage, and the optical fiber assembly 3 is located at the center of the torsion and pressure resistant cage.

[0053] In the case that the optical cable main body is subjected to a radial tension, the two torsion and pressure resistant plastic skeletons 4 can be away from each other in the separated state.

[0054] In the embodiment, the C-shaped torsion and pressure resistant plastic skeletons 4 are fixed on the pulling reinforcing members 2 by injection molding, and the two torsion and pressure resistant plastic skeletons 4 are arranged in a clamping manner, so that when the butterfly-shaped lead-in optical cable of the embodiment is subjected to a slight torsional deformation due to a torsion, the two pulling reinforcing members 2 rely on their own torsional strength and the torsional strength of the butterfly-shaped sheath 1 to resist the torsion, but the two pulling reinforcing members 2 and the two pressure resistant plastic skeletons are connected into a combined torsion and pressure resistant cage in the combined state, thereby resisting the torsion as a whole, that is, the core idea of the application is that the original pulling reinforcing members 2 in the independent state are connected with the clamping torsion and pressure resistant plastic skeletons 4 to form a combined torsion and pressure resistant cage in the combined state, thereby forming a whole structure for resisting the torsion, improving the overall torsional performance of the butterfly-shaped lead-in optical cable, and solving the problem of poor torsional performance of the butterfly-shaped lead-in optical cable in the prior art.

[0055] In addition, since the torsion and pressure resistant cage of the embodiment is in the combined state only when subjected to a torsional force or a pressure, once the butterfly-shaped optical cable is subjected to a radial tension perpendicular to the axial direction of the pulling reinforcing member 2, the two torsion and pressure resistant plastic skeletons 4 can be easily separated due to the clamping arrangement, and the optical fiber stripping operation of the operator during construction is not affected, that is, the torsional performance of the butterfly-shaped lead-in optical cable can be greatly improved without affecting the easy tearing characteristics of the butterfly-shaped lead-in optical cable.

[0056] In the embodiment, the torsion-resistant plastic skeleton 4 comprises a mounting seat 41 and two curved rods 42 integrally injection molded, and a top pressing convex rod 43 and a top pressing concave rod 44 respectively located at the ends of the two curved rods 42.

[0057] The mounting seat 41 is sleeved and fixed on the pulling reinforcing member 2, the side of the top pressing convex rod 43 away from the curved rod 42 is provided with a convex structure, and the side of the top pressing concave rod 44 away from the curved rod 42 is provided with a concave structure.

[0058] The middle part of the optical cable body is provided with two tear grooves 11, in the case of the two torsion-resistant plastic skeletons 4 being oppositely arranged, the convex structure of the top pressing convex rod 43 is located in the concave structure of the top pressing concave rod 44, and the planes on the opposite sides of the top pressing convex rod 43 and the top pressing concave rod 44 coincide with the tear surface formed by the two tear grooves 11.

[0059] In the embodiment, the top pressing convex rod 43 and the top pressing concave rod 44 are arranged, so that the butterfly-shaped lead-in optical cable in the embodiment does not dislocate and separate when subjected to a torsional force, but is in a state of resisting the torsional force as a whole, and in addition, the convex structure of the top pressing convex rod 43 is located in the concave structure of the top pressing concave rod 44, so that the butterfly-shaped lead-in optical cable can resist the pressure as a whole when subjected to the pressure.

[0060] In the embodiment, the cross-sectional shape of the mounting seat 41 is a circular ring.

[0061] In the embodiment, the two oppositely arranged torsion-resistant plastic skeletons 4 are in an elliptical shape.

[0062] The free end of the torsion-resistant plastic skeleton 4 is located at the middle position between the tear groove 11 and the optical fiber assembly 3, so as to avoid affecting the easy-tear characteristic of the butterfly-shaped lead-in optical cable.

[0063] The pulling reinforcing member 2 and the optical fiber assembly 3 in the embodiment are existing structures, and will not be described herein.

[0064] Embodiment 2:

[0065] As shown in Figures 3 to 6 In the embodiment, a connecting section structure is further arranged between adjacent mounting seats 41, adjacent top pressing convex rods 43 and adjacent top pressing concave rods 44.

[0066] Two mounting seats 41 axially adjacent along the pulling reinforcing member 2 are connected by the connecting section structure to form a whole, two top pressing convex rods 43 axially adjacent along the pulling reinforcing member 2 are connected by the connecting section structure to form a whole, and two top pressing concave rods 44 axially adjacent along the pulling reinforcing member 2 are connected by the connecting section structure to form a whole.

[0067] The torsion-resistant plastic skeletons 4 distributed along the axial direction of the tensile reinforcement 2 are connected by the connecting segment structure to form an integrated structure, thereby improving the integrity of the torsion-resistant plastic skeleton and the overall torsion-resistant performance of the butterfly-shaped lead-in optical cable.

[0068] In the embodiment, the pressure cutting piece structure 45 is arranged on the side of the top pressing protruding rod 43 and the top pressing recessed rod 44 facing the optical fiber assembly 3, and the pressure cutting piece structure 45 is coincided with the tearing surface formed by the two tearing grooves 11, so that when the pressure cutting piece structure 45 is used to cut and strip the loose sheath 31, a part of the tearing plane of the butterfly-shaped sheath 1 between the two tearing grooves 11 can be cut first, and the difficulty of tearing the butterfly-shaped sheath 1 can be reduced.

[0069] In the embodiment, the pressure cutting piece structure 45 is arranged on the side of the top pressing protruding rod 43 and the top pressing recessed rod 44 facing the optical fiber assembly 3, and the pressure cutting piece structure 45 is coincided with the tearing surface formed by the two tearing grooves 11, so that when the pressure cutting piece structure 45 is used to cut and strip the loose sheath 31, a part of the tearing plane of the butterfly-shaped sheath 1 between the two tearing grooves 11 can be cut first, and the difficulty of tearing the butterfly-shaped sheath 1 can be reduced. Figure 6 As shown in the figure, the two pressure cutting piece structures 45 will tend to move away from each other due to the elastic deformation of the bending rod 42, so that the two pressure cutting piece structures 45 form a cutting and separating effect, and the cutting and stripping length of the loose sheath 31 is determined by the length of the butterfly-shaped lead-in optical cable pressed and slid by the operator. Then, the operator tears the butterfly-shaped sheath 1 by hand, and the optical fiber unit 32 can be directly exposed without using other tools to strip the loose sheath 31, and subsequent optical fiber fusion can be directly performed. Therefore, based on the easy tearing characteristics of the original butterfly-shaped lead-in optical cable, the optical fiber unit 32 can be directly stripped and exposed by hand, which greatly facilitates the on-site construction of the operator.

[0070] As shown in the figure, the pressure cutting piece structure 45 includes an integrally formed blade body segment 451 and a blade edge segment 452; Figure 6

[0071] The optical fiber assembly 3 includes the loose sheath 31 and a plurality of optical fiber units 32 arranged in the loose sheath 31;

[0072] The height of the blade edge segment 452 is equal to the wall thickness of the loose sheath 31;

[0073] The blade edge segment 452 and the blade body segment 451 have a blocking plane 453 for blocking the blade edge segment 452 from continuing to cut;

[0074] ​The distance between the knife edge section 452 and the optical fiber assembly 3 is 2mm. By setting the blocking plane 453, the continuous cutting of the knife edge section 452 is limited, avoiding the damage to the optical fiber unit 32, especially the area where the loose sheath 31 is peeled off but not fused. In actual processing, the loose sheath 31 can be further pulled and torn to expose more area of the optical fiber unit 32, and the optical fiber unit 32 can be avoided from being damaged.

[0075] In the embodiment, the top pressing protruding rod 43 and the top pressing groove rod 44 are both provided with the pressure cutting piece structure 45.

[0076] The two pressure cutting piece structures 45 are used to apply a circumferentially separated separation force to the optical fiber assembly 3 when the optical fiber assembly 3 is axially pressed along the pulling reinforcing member 2.

[0077] In the embodiment, the pressure cutting piece structures 45 are arranged at intervals along the axial direction of the pulling reinforcing member 2. The length of the pressure cutting piece structure 45 along the axial direction of the pulling reinforcing member 2 is 5cm, and the interval between adjacent pressure cutting piece structures 45 is 40cm. The pressure cutting piece structures 45 are arranged at intervals, which can save materials. At the same time, the part of the butterfly sheath 1 with the pressure cutting piece structure 45 can be marked, such as laser processing or color marking, to facilitate the operator to identify and peel off the butterfly sheath 1 and cut and peel off the loose sheath 31.

[0078] In the embodiment, the cross-sectional shape of the mounting seat 41 is C-shaped, which facilitates the deformation of the mounting seat 41 when pressed by the operator, and avoids excessive stress concentration.

[0079] The remaining structures of the embodiment are the same as those of the above-mentioned embodiment 1, and will not be described here.

[0080] Embodiment 3

[0081] The embodiment provides a manufacturing method of a torsion-resistant butterfly drop cable as described in embodiment 1 or embodiment 2, comprising the following steps:

[0082] S1, injection molding the torsion-resistant plastic skeleton 4 on the pulling reinforcing member 2, and waiting for cooling and forming;

[0083] S2, after the optical fiber assembly 3 is arranged in the torsion-resistant cage formed by the two pulling reinforcing members 2 and the two torsion-resistant plastic skeletons 4, the butterfly sheath 1 is extruded from the extruder to form a butterfly drop cable product.

[0084] The injection molding process of the plastic on the pulling reinforcing member 2 and the extrusion of the butterfly sheath 1 from the extruder are conventional technologies, and will not be described here.

[0085] It is understood that the above embodiments are only exemplary for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the present application, and these modifications and improvements are also considered as the protection scope of the present application.

Claims

1. A torsion-resistant butterfly-shaped drop cable, comprising a cable body, the cable body including a butterfly-shaped sheath (1) and two parallel tension reinforcement members (2) disposed within the butterfly-shaped sheath (1), and an optical fiber assembly (3) located between the two tension reinforcement members (2), characterized in that, It also includes several anti-torsion plastic skeletons (4) that are injection molded and fixed on the tension reinforcement (2) along the axial direction of the tension reinforcement (2). The anti-torsion plastic skeletons (4) are C-shaped and the anti-torsion plastic skeletons (4) on the two tension reinforcements (2) are interlocked. The two anti-torsion plastic skeletons (4) have both a combined state and a separated state; When the optical cable body is subjected to torsion or pressure, the two anti-torsion plastic skeletons (4) approach each other and are in a combined state. The two tension reinforcements (2) and the two anti-torsion plastic skeletons (4) form an anti-torsion cage, and the optical fiber assembly (3) is located at the center of the anti-torsion cage. When the optical cable body is subjected to radial tension, the two anti-torsion plastic skeletons (4) can move away from each other and be separated. The anti-torsion plastic skeleton (4) includes an integrally injection-molded mounting base (41) and two bending rods (42), as well as a top-pressing protrusion rod (43) and a top-pressing groove rod (44) located at the ends of the two bending rods (42). The mounting base (41) is fixed on the tension reinforcement (2). The top pressing protrusion rod (43) has a protrusion structure on the side away from the bending rod (42), and the top pressing groove rod (44) has a groove structure on the side away from the bending rod (42). The optical cable body has two tear grooves (11) in the middle. When the two anti-torsion plastic skeletons (4) are fastened together, the protrusion structure of the top pressure protrusion rod (43) is located in the groove structure of the top pressure groove rod (44), and the planes on the opposite side of the top pressure protrusion rod (43) and the top pressure groove rod (44) coincide with the tear surface formed by the connection of the two tear grooves (11).

2. The anti-torsion butterfly-shaped drop optical cable according to claim 1, characterized in that, The mounting base (41) has a circular or C-shaped cross-section.

3. The anti-torsion butterfly-shaped drop optical cable according to claim 1, characterized in that, It also includes a connecting section structure located between adjacent mounting bases (41), and / or adjacent top pressing protrusions (43), and / or adjacent top pressing grooves (44); Two mounting seats (41) that are axially adjacent along the tension reinforcement (2) are connected as one unit through a connecting section structure, or / and two top pressing protrusion rods (43) that are axially adjacent along the tension reinforcement (2) are connected as one unit through a connecting section structure, or / and two top pressing groove rods (44) that are axially adjacent along the tension reinforcement (2) are connected as one unit through a connecting section structure; Several anti-torsion plastic skeletons (4) distributed along the axial direction of the tension reinforcement (2) are connected into an integral structure through the connecting section structure.

4. The anti-torsion butterfly-shaped drop optical cable according to claim 3, characterized in that, The two mounting seats (41), two top-pressing protrusions (43), and two top-pressing grooves (44) that are adjacent along the axial direction of the tension reinforcement (2) are all connected and fixed by the connecting section structure; It also includes a pressure-slicing structure (45) located on the side of the top pressure protrusion (43) and / or the top pressure groove (44) facing the optical fiber assembly (3), the pressure-slicing structure (45) overlapping the tear surface formed by the connection of the two tear grooves (11).

5. The anti-torsion butterfly-shaped drop optical cable according to claim 4, characterized in that, The pressure slice structure (45) includes an integrally formed blade body section (451) and a blade edge section (452). The optical fiber assembly (3) includes a loose sheath (31) and multiple optical fiber units (32) disposed within the loose sheath (31). The height of the blade section (452) is equal to the wall thickness of the loose sheath (31); There is a blocking plane (453) between the cutting edge section (452) and the blade body section (451) to prevent the cutting edge section (452) from continuing to cut downwards. The distance between the blade segment (452) and the optical fiber assembly (3) ranges from 1 mm to 3 mm.

6. The anti-torsion butterfly-shaped drop optical cable according to claim 4, characterized in that, Both the top pressing protrusion rod (43) and the top pressing groove rod (44) are provided with pressing slice structure (45). Two compression slicing structures (45) are used to apply a circumferential separation force to the fiber assembly (3) when it is axially compression-cut along the tension reinforcement (2).

7. The anti-torsion butterfly-shaped drop optical cable according to claim 4, characterized in that, The pressure slice structure (45) is spaced apart along the axial direction of the tension reinforcement member (2). The length of the pressure slice structure (45) along the axial direction of the tension reinforcement member (2) ranges from 3cm to 7cm, and the spacing between adjacent pressure slice structures (45) ranges from 20cm to 80cm.

8. The anti-torsion butterfly-shaped drop optical cable according to claim 1, characterized in that, The two anti-torsion plastic frames (4) with interlocking are elliptical in shape; The free end of the anti-torsion plastic skeleton (4) is located in the middle between the tear groove (11) and the optical fiber assembly (3).

9. A method for manufacturing a torsion-resistant butterfly-shaped drop optical cable as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Inject anti-torsion plastic skeleton (4) onto the tension reinforcement (2) and wait for it to cool and solidify; S2. After the optical fiber assembly (3) is inserted into the anti-torsion cage formed by two tension reinforcement members (2) and two anti-torsion plastic skeletons (4), it is discharged from the extruder along with the extruded butterfly sheath (1) to form the finished butterfly-shaped optical cable.

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