Inductive loop detection cable of flow monitoring system
By using tinned copper monofilament, copper-zinc alloy electroplating, fully aromatic copolyamide stretch fiber and multi-layer rubber-clad structure in the induction loop detection cable, the cable is moisture-proof, waterproof and tensile-resistant in complex underground environments. The problem of insufficient performance significantly improves durability and service life.
Patent Information
- Application Number
- CN202420972496.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-08
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-05-08
AI Technical Summary
Existing induction loop detection cables have insufficient moisture-proof, waterproof, corrosion-resistant and tensile resistance in complex underground environments, resulting in short maintenance cycles and high maintenance costs.
The tin-plated copper monofilament is used as the inner conductor, and a copper-zinc alloy electroplating layer is formed on the outside, covering the para-type fully aromatic copolyamide stretched fiber braided isolation net, ethylene propylene teremer rubber isolation layer, PE insulation layer, Butyl rubber water-blocking and reduced pressure winding cladding and neoprene sheath enhance the cable's tensile resistance, waterproof and corrosion resistance.
It significantly improves the tensile resistance and waterproof and corrosion resistance of the cable, extends the service life, adapts to the direct buried laying of complex underground environments, and reduces maintenance and replacement costs.
Smart Images
Figure CN222233333U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of cable technology, and in particular to a detection cable for an induction loop of a flow monitoring system. Background Technology
[0002] Inductive loop detection cables are mainly used for controlling traffic signals, security cameras, speed control systems, traffic flow monitoring, and process control. For example, they are installed at lane entry points to detect and control traffic flow. They are generally single-core, multi-strand flexible cables, often with a neoprene rubber sheath. The cable is buried underground to form a loop; the current flowing through it creates an inductive magnetic field. When vehicles pass by, they cause interference, and traffic flow and model are calculated in this way. Due to the complex underground environment, the cables must withstand harsh working conditions. Ordinary detection cables generally have poor moisture resistance, corrosion resistance, and tensile strength, resulting in poor durability, short maintenance and replacement cycles, and high maintenance costs. Utility Model Content
[0003] This application addresses the shortcomings of existing technologies by providing a detection cable for the sensing loop of a flow monitoring system. This cable exhibits excellent corrosion resistance, moisture-proof and water-blocking properties, better tensile strength, and is suitable for direct burial in complex underground environments, ensuring durable application.
[0004] This application solves the above-mentioned technical problems through the following technical solutions.
[0005] The detection cable for the induction circuit of the flow monitoring system includes an inner conductor with a diameter of 1.35mm or 1.78mm, formed by several tin-plated copper monofilaments concentrically twisted together. The outer surface of the tin-plated copper monofilaments is electroplated with a copper-zinc alloy electroplating layer. The inner conductor is sequentially covered with a para-type fully aromatic copolyamide stretched fiber braided isolation mesh, an EPDM rubber isolation layer, a PE insulation layer, a butyl rubber water-blocking and pressure-reducing wrapping layer, and a neoprene rubber sheath. The para-type fully aromatic copolyamide stretched fiber braided isolation mesh is formed by several para-type fully aromatic copolyamide stretched fiber strands spirally wound in opposite directions with a braiding density of not less than 90%. The outer diameter of the neoprene rubber sheath is 4mm to 7.8mm.
[0006] Preferably, the inner conductor with a diameter of 1.35 mm is formed by stranding seven tin-plated copper monofilaments.
[0007] Preferably, the inner conductor with a diameter of 1.78 mm is formed by stranding 19 tin-plated copper monofilaments.
[0008] Preferably, the thickness of the PE insulation layer is 0.7 mm, 0.8 mm, 1.1 mm or 2.1 mm.
[0009] Preferably, the thickness of the neoprene sheath is 0.8 mm to 1.8 mm.
[0010] Preferably, the butyl rubber water-blocking and pressure-reducing wrapping layer is a multi-layer overlapping wrapping structure of butyl rubber tape, with the overlap rate of the butyl rubber tape being one-quarter to one-half of the width of the butyl rubber tape.
[0011] Preferably, the thickness of the butyl rubber water-blocking and pressure-reducing wrapping layer is 0.1 mm to 0.3 mm.
[0012] Preferably, the copper-zinc alloy electroplating layer is 1 μm to 2 μm thick.
[0013] Preferably, the thickness of the para-type fully aromatic copolyamide stretched fiber woven isolation net does not exceed 0.05 mm.
[0014] Preferably, the thickness of the EPDM rubber release layer does not exceed 0.1 mm.
[0015] The beneficial effects of this application are:
[0016] 1. By adding a para-type fully aromatic copolyamide woven insulation mesh between the inner conductor and the EPDM rubber insulation layer, the para-type fully aromatic copolyamide woven insulation mesh has a high tensile modulus, which helps to improve tensile strength, prevents EPDM rubber from sticking to tin-plated copper wire, enhances the tensile performance of the inner conductor, increases the axial elongation allowance of the inner conductor, and helps to adapt to the subsequent hot asphalt filling during stretching. It has stronger adaptability to the complex environment of direct burial and better durability.
[0017] 2. By adding an EPDM rubber isolation layer between the inner conductor and the insulation layer, moisture diffusion to the insulation layer is effectively blocked. The combination of butyl rubber water-blocking and pressure-reducing wrapping layer and neoprene rubber sheath provides excellent waterproof and corrosion-resistant properties. The butyl rubber water-blocking and pressure-reducing wrapping layer effectively blocks external moisture diffusion to the insulation layer, preventing premature deterioration and failure of the insulation layer, extending its service life, and improving its durability.
[0018] 3. Before the tin-plated copper monofilaments are stranded into the inner conductor, a copper-zinc alloy electroplating layer is formed on the outer surface of the tin-plated copper monofilaments. This enhances corrosion resistance, eliminates discoloration and other deterioration caused by oxidation, ensures stable electrical characteristics, makes them more adaptable to complex environments for direct burial, and provides durable applications. Attached Figure Description
[0019] Figure 1 This is a cross-sectional structural diagram of an embodiment of this application.
[0020] Explanation of reference numerals in the attached figures:
[0021] 1-Tin-plated copper monofilament, 2-Inner conductor, 3-Paras-type fully aromatic copolyamide stretched fiber woven isolation mesh, 4-EPDM rubber isolation layer, 5-PE insulation layer, 6-Butyl rubber water-blocking and pressure-reducing wrapping layer, 7-Chloroprene rubber sheath. Detailed Implementation
[0022] The terminology used in the implementation section of this application is only for explaining specific embodiments of this application and is not intended to limit this application. The implementation of the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0023] See Figure 1 The flow monitoring system sensing circuit detection cable of this application embodiment includes an inner conductor 2 formed by concentrically stranding several tin-plated copper monofilaments 1. Specifically, the inner conductor 2 with a diameter of 1.35 mm is formed by stranding 7 tin-plated copper monofilaments 1, and the inner conductor 2 with a diameter of 1.78 mm is formed by stranding 19 tin-plated copper monofilaments 1. A copper-zinc alloy electroplating layer is electroplated on the outer surface of each tin-plated copper monofilament 1. Further, the copper-zinc alloy electroplating layer is 1 μm to 2 μm thick.
[0024] The inner conductor 2 is sequentially covered with a para-type fully aromatic copolyamide stretched fiber woven insulating mesh 3, an EPDM rubber insulating layer 4, a PE insulation layer 5, a butyl rubber water-blocking and pressure-reducing wrapping layer 6, and a neoprene rubber sheath 7. The thickness of the EPDM rubber insulating layer 4 is no more than 0.1 mm. The thickness of the PE insulation layer 5 is 0.7 mm, 0.8 mm, 1.1 mm, or 2.1 mm. The para-type fully aromatic copolyamide stretched fiber woven insulating mesh 3 is composed of several para-type fully aromatic copolyamide stretched fiber strands spirally wound in opposite directions with a weaving density of not less than 90% and a thickness of no more than 0.05 mm. In one embodiment, the butyl rubber water-blocking and pressure-reducing wrapping layer 6 is a multi-layer overlapping wrapping structure of butyl rubber tape, with an overlap rate of one-quarter to one-half of the width of the butyl rubber tape and a thickness of 0.1 mm to 0.3 mm. The thickness of the neoprene rubber sheath 7 is 0.8 mm to 1.8 mm. The outer diameter of the neoprene rubber sheath 7 is 4m to 7.8mm.
[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. Flow monitoring system induction loop detection cable, characterized by: The invention comprises a plurality of tinned copper monofilaments (1) coaxially twisted to form an inner conductor (2) with a diameter of 1.35 mm or 1.78 mm, wherein the outer surface of the tinned copper monofilaments (1) is electroplated to form a copper-zinc alloy electroplating layer, and the outer surface of the inner conductor (2) is sequentially coated with a para-type fully aromatic copolyamide stretched fiber woven isolation net (3), an EPDM rubber isolation layer (4), a PE insulation layer (5), a butyl rubber water-blocking and pressure-reducing wrapping layer (6) and a chloroprene rubber sheath (7), wherein the para-type fully aromatic copolyamide stretched fiber woven isolation net (3) is formed by a plurality of para-type fully aromatic copolyamide stretched fiber strands mutually twisted in a reverse spiral and woven with a weaving density of not less than 90%, and the outer diameter of the chloroprene rubber sheath (7) is 4 to 7.8 mm.
2. The flow monitoring system induction loop detection cable according to claim 1 is characterized by: The inner conductor (2) with a diameter of 1.35 mm is formed by twisting 7 tinned copper monofilaments (1).
3. The flow monitoring system induction loop detection cable according to claim 1 is characterized by: The inner conductor (2) with a diameter of 1.78 mm is formed by twisting 19 tinned copper monofilaments (1).
4. The flow monitoring system induction loop detection cable according to claim 1, characterized in that: The thickness of the PE insulating layer (5) is 0.7 mm, 0.8 mm, 1.1 mm or 2.1 mm.
5. The flow monitoring system induction loop detection cable according to claim 1, characterized in that: The thickness of the chloroprene rubber sheath (7) is 0.8 mm to 1.8 mm.
6. The flow monitoring system induction loop detection cable according to claim 1, characterized in that: The butyl rubber water-blocking and pressure-reducing wrapping layer (6) is a multi-layer overlapping wrapping structure of butyl rubber belts, and the overlapping rate of the butyl rubber belts is one quarter to one half of the width of the butyl rubber belts.
7. The flow monitoring system induction loop detection cable according to claim 1, characterized in that: The thickness of the butyl rubber water-blocking and pressure-reducing wrapping layer (6) is 0.1 mm to 0.3 mm.
8. The flow monitoring system induction loop detection cable according to claim 1, characterized in that: The copper-zinc alloy electroplating layer has a thickness of 1 μm to 2 μm.
9. The flow monitoring system induction loop detection cable according to claim 1, characterized in that: The thickness of the para-type wholly aromatic copolyamide stretched fiber woven isolation net (3) does not exceed 0.05 mm.
10. The flow monitoring system induction loop detection cable according to claim 1, characterized in that: The thickness of the EPDM rubber isolation layer (4) does not exceed 0.1 mm.