Dragging-resistant and tear-resistant lead-in wire
Through the introduction line of twisted wire and multi-layer sheath structure design, the problem of the introduction line being prone to broken wire tear during construction is solved, and higher drag resistance and tensile strength are achieved, which improves the construction quality and service life.
Patent Information
- Application Number
- CN202422181950.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-06
AI Technical Summary
The existing introduction lines are prone to deformation, broken wires and tear due to dragging during construction, resulting in high construction difficulty, high maintenance frequency and high cost.
Four pairs of stranded wires are arranged separately through a cross-shaped isolation core frame, and the externally coated polyurethane elastomeric inner sheath, AFRP reinforced braided impact-resistant plain web and high-density polyvinyl chloride outer sheath layer are designed. The inner sheath is equipped with brass-plated steel strength units to enhance longitudinal tensile force and tensile resistance.
It improves the drag resistance and tensile strength of the introduced wire, prevents wire breakage and tear, reduces construction difficulty, extends service life and reduces maintenance work frequency and cost.
Smart Images
Figure CN223140426U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of cables, and in particular, relates to a drag-resistant and tear-proof lead-in wire. Background Art
[0002] The lead-in wire refers to the part between the branch point and the user. When the distribution equipment has entered the user's building, the lead-in wire only includes the indoor connection. When the distribution equipment has not entered the user's building, the lead-in wire includes two parts: the outdoor lead-in wire and the indoor lead-in wire of the user. When the lead-in wire is used as a telephone line extending from the distribution network to the user end, it needs to have a certain load-bearing strength and tensile strength. However, general lead-in wires do not have their own load-bearing performance, have a low tensile strength, cannot provide sufficient longitudinal tension, are prone to deformation, broken wires and tearing risks during cable construction, increase the construction difficulty, have poor durability, high maintenance frequency, and high maintenance costs. Summary of the Utility Model
[0003] Aiming at the deficiencies of the prior art, the technical problem to be solved by this application is to provide a drag-resistant and tear-proof lead-in wire, which enhances the structural strength, has better drag resistance and tensile strength, provides sufficient longitudinal tension, prevents broken wires and tearing from occurring, is beneficial to improving the construction quality, reducing the construction difficulty, and has better durability.
[0004] The above technical problem is solved by the following technical solutions in this application.
[0005] The drag-resistant and tear-proof lead-in wire includes four pairs of twisted wires separated and arranged by a cross-shaped isolation core frame and jointly twisted to form a cable core. An inner polyurethane elastomer sheath, an AFRP reinforced braided impact-resistant plain woven mesh and a high-density polyethylene outer sheath layer are sequentially coated outside the cable core. The pair of twisted wires is composed of two insulated wire cores twisted together. The insulated wire core includes a solid annealed bare copper conductor and a high-density polyethylene insulating layer. The diameter of the solid annealed bare copper conductor is 0.5 mm or 0.9 mm. Three longitudinal holes are circumferentially and evenly arranged in the inner polyurethane elastomer sheath, and a brass-plated steel strength unit is arranged in the longitudinal holes. The thickness of the high-density polyethylene outer sheath layer is not less than 0.4 mm.
[0006] Preferably, the outer diameter of the high-density polyethylene outer sheath layer is 5.6 mm to 6.8 mm.
[0007] Preferably, a thermoplastic EVA adhesive layer is provided on the inner surface of the high-density polyethylene outer sheath layer.
[0008] Preferably, the thickness of the high-density polyethylene insulating layer is 0.2 mm to 0.3 mm.
[0009] Preferably, the AFRP-reinforced woven impact-resistant plain weave net comprises an inner and outer double-layer aramid yarn plain weave net. The inner-layer aramid yarn plain weave net is formed by weaving fine aramid yarns into a plain weave net structure, and the outer-layer aramid yarn plain weave net is formed by weaving thick aramid yarns into a plain weave net structure.
[0010] Preferably, the diameter of the thick aramid yarn is 2 to 8 times that of the fine aramid yarn.
[0011] Preferably, the brass-plated steel strength unit is composed of three 0.25-mm-diameter copper-plated steel wires stranded together.
[0012] Preferably, the thickness of the polyurethane elastomer inner sheath is not less than 1 mm.
[0013] Preferably, the four pairs of twisted wires have the same lay direction and the lay direction opposite to that of the cable core.
[0014] Preferably, the lay lengths of the four pairs of twisted wires are 10 mm to 30 mm and are different from each other.
[0015] Advantages of the present application:
[0016] 1. By adding a polyurethane elastomer inner sheath, the flexibility is improved, the lateral pressure during bending can be withstood, the stress concentration caused by the offset of the brass-plated steel strength unit towards each pair of twisted wires is mitigated, which helps to enhance the tensile resistance of the cable. By adding three brass-plated steel strength units in the longitudinal holes of the polyurethane elastomer inner sheath to form a triangular stable structure to enhance the strength, sufficient longitudinal tensile force can be provided, which is beneficial for dragging operations during construction, and helps to prevent wire breakage and tearing, is conducive to improving the construction quality, reducing the construction difficulty, reducing potential safety hazards, reducing the frequency of maintenance work, reducing the maintenance cost, extending the service life, and having better durability and applicability.
[0017] 2. The four pairs of twisted wires are separated and arranged by a cross-shaped isolation core frame to keep the cable core structure balanced, and a polyurethane elastomer inner sheath is coated outside the cable core to keep the cable core structure round, improving the mechanical strength. The polyurethane elastomer inner sheath has good physical and mechanical properties and high elasticity, enabling the lead-in wire to have good vibration damping performance. Under slight impact and vibration conditions, the oscillating load borne by each pair of twisted wires can be mitigated, preventing wire breakage and ensuring stable electrical characteristics, with better durability.
[0018] 3. Adding the AFRP-reinforced woven impact-resistant plain weave net helps to improve the flexibility and tensile resistance of the lead-in wire, increases the mechanical strength of the inner and outer sheath layers, the sheath layer is not easily fatigued and damaged, effectively protects the cable sheath, has better durability, and extends the service life. Description of the Drawings
[0019] Figure 1Schematic cross-sectional structure diagram of the embodiment of the present application.
[0020] Description of the reference numerals in the drawings:
[0021] 1 - Twisted pair, 2 - Cross-shaped isolation core frame, 3 - Polyurethane elastomer inner sheath, 4 - AFRP reinforced anti-impact plain woven net, 5 - High-density polyvinyl chloride outer sheath layer, 6 - Insulated wire core, 7 - Solid annealed bare copper conductor, 8 - High-density polyvinyl chloride insulation layer, 9 - Longitudinal hole, 10 - Brass-plated steel strength unit. Specific embodiments
[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.
[0023] See Figure 1 , the drag-resistant and tear-proof lead-in wire of the embodiment of the present application includes four twisted pairs 1 separated and arranged by a cross-shaped isolation core frame 2 and jointly twisted to form a cable core. Specifically, the four twisted pairs 1 have the same lay direction and the opposite lay direction to that of the cable core. The lay lengths of the four twisted pairs 1 are 10 mm to 30 mm and are different from each other. Each twisted pair 1 is composed of two insulated wire cores 6 twisted together. The insulated wire core 6 includes a solid annealed bare copper conductor 7 and a high-density polyvinyl chloride insulation layer 8. The diameter of the solid annealed bare copper conductor 7 is 0.5 mm or 0.9 mm, and the thickness of the high-density polyvinyl chloride insulation layer 8 is 0.2 mm to 0.3 mm.
[0024] The outer part of the cable core is successively coated with a polyurethane elastomer inner sheath 3, an AFRP reinforced woven impact-resistant plain weave net 4, and a high-density polyvinyl chloride outer sheath layer 5. Further, a thermoplastic EVA adhesive layer is provided on the inner surface of the high-density polyvinyl chloride outer sheath layer 5. The thickness of the polyurethane elastomer inner sheath 3 is not less than 1 mm. Three longitudinal holes 9 are circumferentially and evenly arranged in the polyurethane elastomer inner sheath 3, and a brass-plated steel strength unit 10 is arranged in the longitudinal holes 9. Further, the brass-plated steel strength unit 10 is composed of three copper-plated steel wires with a diameter of 0.25 mm twisted together. In one embodiment, the AFRP reinforced woven impact-resistant plain weave net 4 includes an inner and an outer double-layer aramid yarn plain weave net. The inner-layer aramid yarn plain weave net is formed by weaving fine aramid yarns into a plain weave net structure, and the outer-layer aramid yarn plain weave net is formed by weaving thick aramid yarns into a plain weave net structure. Further, the wire diameter of the thick aramid yarns is 2 to 8 times that of the fine aramid yarns. The thickness of the high-density polyvinyl chloride outer sheath layer 5 is not less than 0.4 mm. The outer diameter of the high-density polyvinyl chloride outer sheath layer 5 is 5.6 mm to 6.8 mm.
[0025] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these changes and modifications.
Claims
1. Drag-resistant and tear-proof lead-in wire, characterized by: Four twisted pairs (1) are arranged separately by a cross-shaped isolation core frame (2) and are jointly twisted to form a cable core. An inner sheath of polyurethane elastomer (3), an AFRP-reinforced woven impact-resistant plain weave net (4), and an outer sheath layer of high-density polyvinyl chloride (5) are sequentially coated on the outside of the cable core. The twisted pair (1) is composed of two insulated cores (6) twisted together. The insulated core (6) includes a solid annealed bare copper conductor (7) and a high-density polyvinyl chloride insulation layer (8). The diameter of the solid annealed bare copper conductor (7) is 0.5 mm or 0.9 mm. Three longitudinal holes (9) are evenly distributed in the circumferential direction of the inner sheath of polyurethane elastomer (3), and a brass-plated steel strength unit (10) is arranged in the longitudinal hole (9). The thickness of the outer sheath layer of high-density polyvinyl chloride (5) is not less than 0.4 mm.
2. The drag-resistant and tear-proof lead-in wire according to claim 1, characterized in that: The outer diameter of the outer sheath layer of high-density polyvinyl chloride (5) is 5.6 mm to 6.8 mm.
3. The drag-resistant and tear-proof lead-in wire according to claim 1, characterized in that: A thermoplastic EVA adhesive layer is provided on the inner surface of the outer sheath layer of high-density polyvinyl chloride (5).
4. The drag-resistant and tear-proof lead-in wire according to claim 1, characterized in that: The thickness of the high-density polyvinyl chloride insulation layer (8) is 0.2 mm to 0.3 mm.
5. The drag-resistant and tear-proof lead-in wire according to claim 1, characterized in that: The AFRP-reinforced woven impact-resistant plain weave net (4) includes an inner and an outer double-layer aramid strand plain weave net. The inner-layer aramid strand plain weave net is formed by weaving fine aramid strands into a plain weave net structure, and the outer-layer aramid strand plain weave net is formed by weaving thick aramid strands into a plain weave net structure.
6. The drag-resistant and tear-proof lead-in wire according to claim 5, characterized in that: The wire diameter of the thick aramid strand is 2 to8 times that of the fine aramid strand.
7. The drag-resistant and tear-proof lead-in wire according to claim 1, characterized in that: The brass-plated steel strength unit (10) is composed of three copper-plated steel wires with a diameter of 0.25 mm twisted together.
8. The drag-resistant and tear-proof lead-in wire according to claim 1, characterized in that: The thickness of the inner sheath of polyurethane elastomer (3) is not less than 1 mm.
9. The drag-resistant and tear-proof lead-in wire according to claim 1, wherein: The four twisted pairs (1) have the same lay direction and the lay direction opposite to that of the cable core.
10. The drag-resistant and tear-proof lead-in wire according to claim 1, characterized in that: The lay lengths of the four twisted pairs (1) are 10 mm to 30 mm and are different from each other.