Double-layer stranded shielding layer breaking prevention combination cable

Abstract

The utility model discloses a double-layer twisted type shielding layer breaking prevention combination cable, which comprises an inner-layer cable core body formed by twisting two coaxial cable cores and two nylon resin filling cores, wherein the outer part of the inner-layer cable core body is coated with a PTFE (Polytetrafluoroethylene) semi-directional belt inner wrapping antifriction layer; the four power wire cores, the two control wire cores and the four nylon resin filling cores are twisted around the outer portion of the PTFE semi-directional belt inner wrapping antifriction layer to form an outer layer wire core body, and the outer portion of the outer layer wire core body is sequentially coated with a PTFE semi-directional belt outer wrapping antifriction layer, a metal wire mixed weaving total shielding layer, a TPU extruded inner sheath layer, a galvanized steel wire armor layer and a TPU extruded outer sheath layer. According to the combination cable, the assembly structure of the power wire cores, the control wire cores and the coaxial wire cores in the cable core is optimized in a double-layer mode, double-layer twisting is carried out, the bending resistance is better, wire breaking and core breaking are avoided, the structure of the branch shielding layer and the structure of the total shielding layer are optimized, shielding layer wire breaking can be restrained, the stable shielding performance is guaranteed, and the durability is better.

Description

Technical Field

[0001] The present application relates to the technical field of cables, and in particular to a double-layer twisted shielding layer break-proof combined cable. Background Art

[0002] Control cables are used as connecting wires between various electrical appliances, instruments, meters and automatic devices. They play the role of transmitting various power signals such as startup, operation, control, signal display and measurement. They are widely used in control, measurement, signal transmission, alarm and interlocking systems of industrial and mining enterprises, substations, transportation, science and technology and other departments. The electromagnetic noise environment at industrial application sites is often very complex, and the radiation or conduction of electromagnetic noise (EMI) may seriously interfere with the normal operation of the equipment. In this process, an important carrier of electromagnetic noise propagation is the various cables used in production line equipment. Some of them are noise sources, and some are disturbed objects. To combat electromagnetic noise interference on electrical lines, a very important way is to use shielded cables. Multi-core cables with sub-shielding and overall shielding twist the coaxial core, power core and control core into cables at the same layer, resulting in a larger outer diameter of the cable, which is not conducive to the miniaturization and miniaturization development trend of the adaptation equipment. The extension amount and tensile strength of each core are different, and it is easy to break the wire and core. Moreover, the shielding layer of the shielded control line mostly adopts a copper wire braided shielding layer structure, and the diameter of the copper wire generally does not exceed 0.18mm. After the cable is subjected to repeated bending during operation, the sub-shielding and overall shielding layers are prone to breakage, resulting in unstable shielding effect and poor durability, which brings hidden dangers to production safety. Utility Model Content

[0003] The present application aims to solve the technical problem of providing a double-layer twisted anti-shielding layer break combination cable by optimizing the assembly structure of the power core, control core and coaxial core in the cable core through double-layer twisting, which has better bending resistance and avoids wire and core breakage. The optimization of the separate and overall shielding layer structure is beneficial to suppress the occurrence of shielding layer breakage, ensures stable shielding performance and better durability.

[0004] This application solves the above technical problems through the following technical solutions.

[0005] A double-layer twisted shielding layer breakage-proof combined cable comprises two coaxial cores and two nylon resin-filled cores twisted together to form an inner core body, the outer surface of the inner core body is coated with a PTFE semi-directional tape inner wrapped anti-friction layer, four power cores, two control cores and four nylon resin-filled cores are twisted together around the PTFE semi-directional tape inner wrapped anti-friction layer to form an outer core body, the outer surface of the outer core body is sequentially coated with a PTFE semi-directional tape outer wrapped anti-friction layer, a metal wire mixed overall shielding layer, a TPU extruded inner sheath layer, a galvanized steel wire armor layer and a TPU extruded outer sheath layer, the coaxial The wire core includes a tinned copper monofilament conductor, a foamed polyethylene insulation layer, a shielded wire winding sub-shielding layer and a PET resin covering layer. The control wire core includes two insulated wire cores twisted in pairs and twisted together with a nylon fiber filling core material to form a twisted wire core body. The outside of the twisted wire core body is sequentially coated with a para-type fully aromatic copolyamide stretched fiber twisted wire wrapped pressure relief layer and a metal wire mixed shielding layer. The metal wire mixed total shielding layer and the metal wire mixed sub-shielding layer are both composed of an inner layer of aluminum-magnesium wire and an outer layer of tinned copper wire, which are spirally wound and woven in opposite directions. The wire diameter of the tinned copper wire is larger than the wire diameter of the aluminum-magnesium wire.

[0006] Preferably, the wire diameter of the tinned copper wire is 1.1 to 1.3 times the wire diameter of the aluminum-magnesium wire.

[0007] Preferably, the inner wrapped friction reduction layer of the PTFE semi-directional belt and the outer wrapped friction reduction layer of the PTFE semi-directional belt are both PTFE semi-directional belt overlapping wrapped structures, the winding direction of the inner wrapped friction reduction layer of the PTFE semi-directional belt is opposite to the twist direction of the inner layer wire core, and the winding direction of the outer wrapped friction reduction layer of the PTFE semi-directional belt is opposite to the twist direction of the outer layer wire core.

[0008] Preferably, the power line core comprises a power line core conductor and a PFA insulation layer, the power line core conductor is formed by twisting a number of oxygen-free copper wires with a wire diameter of 0.04mm to 0.08mm, and the thickness of the PFA insulation layer is 0.5mm to 0.8mm.

[0009] Preferably, the shielded wire wrapped sub-shielding layer is a structure of several sub-shielded wires spirally wound side by side, and the sub-shielded wire is composed of a silver-plated copper monofilament conductor and a polyurethane coating layer. The diameter of the silver-plated copper monofilament conductor is not less than one third of the diameter of the tin-plated copper monofilament conductor and does not exceed the diameter of the tin-plated copper monofilament conductor. The diameter of the silver-plated copper monofilament conductor is 0.1mm to 0.15mm, and the thickness of the polyurethane coating layer is 0.01mm to 0.05mm.

[0010] Preferably, the insulated core comprises an inner conductor and an XLPE insulation layer.

[0011] Preferably, the inner conductor is composed of a plurality of tinned copper monofilaments with a diameter of 0.02 mm to 0.04 mm twisted together.

[0012] Preferably, the pressure relief layer of the para-type wholly aromatic copolyamide stretched fiber strand is composed of two layers of para-type wholly aromatic copolyamide stretched fiber strands wrapped in reverse spirals with a weaving density of at least 90%, and the winding pitch of the para-type wholly aromatic copolyamide stretched fiber strand is smaller than the twist pitch of the twisted wire core.

[0013] Preferably, the shielding density of the mixed metal wire sub-shielding layer is smaller than the braiding density of the wrapped pressure relief layer of the para-type wholly aromatic copolyamide stretched fiber strands.

[0014] Preferably, the metal wire mixed braided total shielding layer and the metal wire mixed braided sub-shielding layers are coated with insulating lubricating silicone grease and the shielding density is not less than 85%.

[0015] Beneficial effects of this application:

[0016] 1. By optimizing the cable core structure, the power core, control core and coaxial core are placed in two layers and twisted in layers. Three types of cores with different elongation and tensile strength are arranged in two layers. The twisting direction of each layer of core is consistent, which is beneficial to improve the bending resistance. The PTFE semi-directional tape is wrapped inside and outside the anti-friction layer to form excellent sliding properties, so that sliding occurs between the inner and outer layers of the cable core, forming an effect similar to a rolling bearing, with small sliding friction resistance, improving the bending resistance, and helping to inhibit wire and core breakage, improve durability, and reduce safety hazards in production.

[0017] 2. By optimizing the shielding structure of the mixed metal wire and the total shielding layer, replacing the original single copper wire or aluminum wire braiding structure, the tinned copper wire and the aluminum-magnesium wire are spirally wound in opposite directions. The tinned copper wire has strong rigidity and better conductivity. The shielding layer formed by the counter-spiral winding of the tinned copper wire and the aluminum-magnesium wire has both flexibility and rigidity. The diameter of the tinned copper wire in the outer layer is larger than the diameter of the aluminum-magnesium wire in the inner layer, which is beneficial to suppress the breakage of the shielding layer when the cable is bent. The shielding layer is coated with lubricating silicone grease to obtain a friction-reducing effect, which slows down the friction between the tinned copper wire and the aluminum-magnesium wire, helps to reduce friction stress, suppress wire breakage, ensure the stability of the shielding performance, and improve durability.

[0018] 3. The sub-shielding layer of the coaxial core uses multiple shielded wires spirally wound side by side. The shielded wire is composed of a silver-plated copper monofilament conductor and a polyurethane covering layer, so that the silver-plated copper monofilaments will not directly contact each other, inhibiting friction breakage and eliminating contact current generated by the shielding layer, which helps to inhibit signal attenuation during long-distance transmission, ensure the stability of the shielding effect, and have better electrical characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 1-coaxial core, 2-nylon resin filled core, 3-PTFE semi-directional tape inner wrapped anti-friction layer, 4-power line core, 5-control line core, 6-PTFE semi-directional tape outer wrapped anti-friction layer, 7-metal wire mixed overall shielding layer, 8-TPU extruded inner sheath layer, 9-galvanized steel wire armor layer, 10-TPU extruded outer sheath layer, 11-tinned copper monofilament conductor, 12-foamed polyethylene insulation layer, 13-shielded wire winding sub-shielding layer, 14-PET resin coating layer, 15-insulated core, 16-nylon fiber filled core material, 17-para-type fully aromatic copolyamide stretched fiber stranded wire wrapped pressure relief layer, 18-metal wire mixed sub-shielding layer, 19-power line core conductor, 20-PFA insulation layer, 21-inner conductor, 22-XLPE insulation layer. DETAILED DESCRIPTION

[0022] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] See also Figure 1 The double-layer twisted shielding layer disconnection-proof combined cable of the embodiment of the present application comprises two coaxial cores 1 and two nylon resin-filled cores 2 twisted to form an inner wire core body, the coaxial core 1 comprises a tinned copper monofilament conductor 11, a foamed polyethylene insulation layer 12, a shielded wire winding sub-shielding layer 13 and a PET resin coating layer 14. In one embodiment, the shielded wire winding sub-shielding layer 13 is a structure of several sub-shielded wires wound in parallel spirally, the sub-shielded wires are composed of a silver-plated copper monofilament conductor and a polyurethane coating layer, the diameter of the silver-plated copper monofilament conductor is not less than one-third of the diameter of the tin-plated copper monofilament conductor 11 and does not exceed the diameter of the tin-plated copper monofilament conductor 11, the diameter of the silver-plated copper monofilament conductor is 0.1 mm to 0.15 mm, and the thickness of the polyurethane coating layer is 0.01 mm to 0.05 mm.

[0024] The outer layer of the inner wire core is coated with a PTFE semi-directional tape inner wrapped anti-friction layer 3. Four power cores 4, two control cores 5 and four nylon resin filled cores 2 are twisted around the outer layer of the PTFE semi-directional tape inner wrapped anti-friction layer 3 to form an outer wire core. The control core 5 includes two insulated cores 15 twisted in pairs and twisted together with a nylon fiber filled core material 16 to form a twisted wire core. Specifically, the insulated core 15 includes an inner conductor 21 and an XLPE insulation layer 22. Further, the inner conductor 21 is composed of several tinned copper monofilaments with a diameter of 0.02mm to 0.04mm. In one embodiment, the power core 4 includes a power core conductor 19 and a PFA insulation layer 20. The power core conductor 19 is composed of several oxygen-free copper wires with a wire diameter of 0.04mm to 0.08mm, and the thickness of the PFA insulation layer 20 is 0.5mm to 0.8mm. The outside of the twisted pair core is sequentially coated with a para-type wholly aromatic copolyamide stretched fiber strand wrapped pressure relief layer 17 and a metal wire mixed shielding layer 18. In one embodiment, the para-type wholly aromatic copolyamide stretched fiber strand wrapped pressure relief layer 17 is composed of two layers of para-type wholly aromatic copolyamide stretched fiber strands that are mutually reversely spirally wrapped and have a braiding density of at least 90%. The winding pitch of the para-type wholly aromatic copolyamide stretched fiber strand is smaller than the twist pitch of the twisted pair core. Furthermore, the shielding density of the metal wire mixed shielding layer 18 is smaller than the braiding density of the para-type wholly aromatic copolyamide stretched fiber strand wrapped pressure relief layer 17.

[0025] The outer layer of the outer wire core is coated with a PTFE semi-directional tape outer wrapping anti-friction layer 6, a metal wire mixed braided total shielding layer 7, a TPU extruded inner sheath layer 8, a galvanized steel wire armor layer 9 and a TPU extruded outer sheath layer 10 in sequence. The metal wire mixed braided total shielding layer 7 and the metal wire mixed braided sub-shielding layer 18 are both composed of an inner layer of aluminum-magnesium wire and an outer layer of tinned copper wire, which are mutually reversely spirally wound and woven. The wire diameter of the tinned copper wire is larger than the wire diameter of the aluminum-magnesium wire. Furthermore, the wire diameter of the tinned copper wire is 1.1 to 1.3 times the wire diameter of the aluminum-magnesium wire. The metal wire mixed braided total shielding layer 7 and the metal wire mixed braided sub-shielding layer 18 are both coated with insulating lubricating silicone grease and the shielding density is not less than 85%. In one embodiment, the PTFE semi-directional tape inner wrapped friction reduction layer 3 and the PTFE semi-directional tape outer wrapped friction reduction layer 6 are both PTFE semi-directional tape overlapping wrapped structures, the winding direction of the PTFE semi-directional tape inner wrapped friction reduction layer 3 is opposite to the twist direction of the inner layer wire core, and the winding direction of the PTFE semi-directional tape outer wrapped friction reduction layer 6 is opposite to the twist direction of the outer layer wire core.

[0026] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. Double-layer twisted shielding layer disconnection protection combined cable, characterized by: The invention comprises two coaxial line cores (1) and two nylon resin filled cores (2) twisted together to form an inner core body, wherein the outer surface of the inner core body is coated with a PTFE semi-directional tape inner wrapped anti-friction layer (3), and four power line cores (4), two control line cores (5) and four nylon resin filled cores (2) are twisted together around the PTFE semi-directional tape inner wrapped anti-friction layer (3) to form an outer core body, wherein the outer surface of the outer core body is sequentially coated with a PTFE semi-directional tape outer wrapped anti-friction layer (6), a metal wire mixed braided overall shielding layer (7), a TPU extruded inner sheath layer (8), a galvanized steel wire armor layer (9) and a TPU extruded outer sheath layer (10), wherein the coaxial line core (1) comprises tinned copper monofilaments. A conductor (11), a foamed polyethylene insulation layer (12), a shielded wire winding sub-shielding layer (13) and a PET resin coating layer (14), wherein the control wire core (5) comprises two insulating wire cores (15) twisted in pair and twisted together with a nylon fiber filling core material (16) to form a twisted wire core body, the outer portion of the twisted wire core body is sequentially coated with a para-type fully aromatic copolyamide stretched fiber twisted wire wrapped pressure relief layer (17) and a metal wire mixed shielding layer (18), the metal wire mixed overall shielding layer (7) and the metal wire mixed shielding layer (18) are both formed by an inner layer of aluminum-magnesium wire and an outer layer of tinned copper wire, which are mutually reversely spirally wound and woven, and the wire diameter of the tinned copper wire is larger than the wire diameter of the aluminum-magnesium wire.

2. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 1 is characterized in that: The wire diameter of the tinned copper wire is 1.1 to 1.3 times the wire diameter of the aluminum-magnesium wire.

3. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 1 is characterized in that: The PTFE semi-directional tape inner wrapped anti-friction layer (3) and the PTFE semi-directional tape outer wrapped anti-friction layer (6) are both PTFE semi-directional tape overlapping wrapped structures; the winding direction of the PTFE semi-directional tape inner wrapped anti-friction layer (3) is opposite to the twist direction of the inner layer wire core, and the winding direction of the PTFE semi-directional tape outer wrapped anti-friction layer (6) is opposite to the twist direction of the outer layer wire core.

4. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 1 is characterized in that: The power line core (4) comprises a power line core conductor (19) and a PFA insulation layer (20); the power line core conductor (19) is formed by twisting a plurality of oxygen-free copper wires with a wire diameter of 0.04 mm to 0.08 mm; and the PFA insulation layer (20) has a thickness of 0.5 mm to 0.8 mm.

5. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 1 is characterized in that: The shielded conductor winding sub-shielding layer (13) is a structure of a plurality of sub-shielded conductors spirally wound side by side. The sub-shielded conductors are composed of a silver-plated copper monofilament conductor and a polyurethane coating layer. The diameter of the silver-plated copper monofilament conductor is not less than one third of the diameter of the tin-plated copper monofilament conductor (11) and does not exceed the diameter of the tin-plated copper monofilament conductor (11). The diameter of the silver-plated copper monofilament conductor is 0.1 mm to 0.15 mm. The thickness of the polyurethane coating layer is 0.01 mm to 0.05 mm.

6. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 1 is characterized in that: The insulated wire core (15) comprises an inner conductor (21) and an XLPE insulation layer (22).

7. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 6 is characterized in that: The inner conductor (21) is composed of a plurality of tinned copper monofilaments having a diameter of 0.02 mm to 0.04 mm twisted together.

8. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 1 is characterized in that: The para-type wholly aromatic copolyamide stretched fiber strand wrapped pressure relief layer (17) is composed of two layers of para-type wholly aromatic copolyamide stretched fiber strands wrapped in reverse spirals with a braiding density of at least 90%, and the winding pitch of the para-type wholly aromatic copolyamide stretched fiber strand is smaller than the twisted wire core twist pitch.

9. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 8 is characterized in that: The shielding density of the metal wire mixed braided sub-shielding layer (18) is less than the braiding density of the para-type fully aromatic copolyamide stretched fiber stranded wire wrapped pressure relief layer (17).

10. The double-layer twisted shielding layer disconnection-proof combined cable according to claim 1, characterized in that: The metal wire mixed braided total shielding layer (7) and the metal wire mixed braided sub-shielding layer (18) are both coated with insulating lubricating silicone grease and have a shielding density of not less than 85%.

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