Anti-loosening type total shielding armored instrument cable

Abstract

Five single-pair shielding twisted-pair wire cores are uniformly distributed in the circumferential direction of a TPU elastomer filling core and are jointly twisted to form a cable core, each twisted-pair wire core comprises two insulating wire cores which are back-twisted and twisted to form a wire core body, and an aluminum-plastic composite belt wrapping sub-shielding layer is wrapped outside the wire core body. The winding direction of the branch shielding layer is the same as the twisting direction of the wire core body, the twisting direction of the wire core body is the same as the twisting direction of the cable core, and the cable core is sequentially coated with an aluminum-plastic composite belt wrapping total shielding layer, a metal wire mixed weaving total shielding layer, an irradiation crosslinking linear low-density polyethylene lining layer, a galvanized steel wire armor layer and an irradiation crosslinking linear low-density polyethylene outer sheath layer. The winding direction of the aluminum-plastic composite belt wrapping total shielding layer is the same as the twisting direction of the cable core, and the outer diameter of the irradiation crosslinking linear low density polyethylene outer sheath layer is 15mm to 24mm. The instrument cable is high in mechanical strength, the twisted wire cores are not easy to loosen, the anti-interference capability is enhanced, and the stable shielding effect is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of cables, and in particular to a loosening-inhibiting overall shielded armored instrument cable. Background Art

[0002] In intelligent industrial production lines, symmetrical communication cables are used in signal transmission and control systems in monitoring equipment, electronic computers, and information processing equipment. Steel wire armor is added and usually used in working conditions with increased risk of mechanical damage. 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. To combat electromagnetic noise interference on electrical lines, a very important way is to use symmetrical communication cables with shielding. However, in the cable core structure with multiple pairs of twisted cores, the twisted cores generally adopt a double-core twisting method without back-twisting and are wrapped with a binding tape or shielding layer on the outside in reverse. After repeated bending and twisting during the operation of the cable, the double cores of the twisted cores are prone to loosening, which is not conducive to reducing the interference between the pairs themselves, greatly weakening the anti-interference ability, and the shielding effect is unstable, affecting normal operation. Utility Model Content

[0003] The present application aims to solve the technical problem of providing a loosening-inhibiting total shielded armored instrument cable with high mechanical strength, certain mechanical damage resistance, and twisted pair cores that are not easy to loosen, thereby enhancing anti-interference ability, ensuring a stable shielding effect, and better durability.

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

[0005] The loosening-inhibiting total shielded armored instrument cable has five single-pair shielded twisted cores uniformly distributed circumferentially around a TPU elastomer-filled core and twisted together to form a cable core. The single-pair shielded twisted core includes two insulated cores that are twisted back to form a core body. The insulated core includes an inner conductor and an XLPE insulation layer. The inner conductor has a diameter of 0.8 mm to 1.4 mm. The outside of the core body is coated with an aluminum-plastic composite tape wrapped sub-shielding layer. The winding direction of the aluminum-plastic composite tape wrapped sub-shielding layer is the same as the twisting direction of the core body. The twisting direction of the core body is the same as the twisting direction of the cable core. The outside of the cable core is sequentially coated with an aluminum-plastic composite tape wrapped total shielding layer, a metal wire mixed total shielding layer, an irradiated cross-linked linear low-density polyethylene inner lining layer, a galvanized steel wire armor layer and an irradiated cross-linked linear low-density polyethylene outer sheath layer. The winding direction of the aluminum-plastic composite tape wrapped total shielding layer is the same as the twisting direction of the cable core. The outer diameter of the irradiated cross-linked linear low-density polyethylene outer sheath layer is 15 mm to 24 mm.

[0006] Preferably, the inner conductor is an annealed copper monofilament conductor or a tinned copper monofilament conductor.

[0007] Preferably, the inner conductor is composed of a plurality of tinned copper wires with a diameter of 0.2 mm to 0.5 mm twisted together.

[0008] Preferably, the XLPE insulation layer has a thickness of 0.5 mm to 0.6 mm.

[0009] Preferably, the aluminum-plastic composite tape wrapped sub-shielding layer and the aluminum-plastic composite tape wrapped overall shielding layer are both aluminum-plastic composite tape spirally overlapped wrapped structures, and the aluminum-plastic composite tape is formed by a composite of PET film and aluminum foil.

[0010] Preferably, the PET film has a thickness of 20 μm to 250 μm, and the aluminum foil has a thickness of 3 μm to 80 μm.

[0011] Preferably, the five single-pair shielded twisted wire cores have different lay lengths.

[0012] Preferably, the mixed metal wire total shielding layer is composed of an inner layer of aluminum-magnesium wire and an outer layer of tinned copper wire, which are woven in counter-rotating spirals. The wire diameter of the tinned copper wire is larger than the wire diameter of the aluminum-magnesium wire. The mixed metal wire total shielding layer is coated with insulating lubricating silicone grease.

[0013] Preferably, the radiation cross-linked linear low-density polyethylene liner has a thickness of 1.1 mm or 1.2 mm.

[0014] Preferably, the thickness of the radiation cross-linked linear low-density polyethylene outer sheath layer is 1.4 mm to 1.8 mm.

[0015] Beneficial effects of this application:

[0016] 1. Five single-pair shielded twisted cores and TPU elastomer filling cores are twisted together in the cable core. The internal structure of the cable core is more rounded and balanced. The TPU elastomer filling core has good physical and mechanical properties, enhances mechanical strength, helps to reduce the load on each pair of twisted cores, relieves lateral pressure when the cable is bent, improves flexibility, and helps to inhibit the cracking of the aluminum-plastic composite tape wrapped shielding layer of each pair of twisted cores, ensuring stable shielding characteristics and improving durability.

[0017] 2. The two insulated cores of a single pair of shielded twisted cores are optimized to be back-twisted, the insulated cores themselves are twisted and the twisting direction is opposite to the twisting direction of the core body, the twisting direction of the core body is the same as the twisting direction of the cable core, the winding direction of the sub-shielding layer of the aluminum-plastic composite tape is the same as the twisting direction of the core body of the twisted core, and the winding direction of the total shielding layer of the aluminum-plastic composite tape is the same as the twisting direction of the cable core. During the bending and torsion process of the cable, it is beneficial to suppress the loosening of the twisted core, and then it is beneficial to reduce the influence of interference between the two insulated cores of the twisted core, enhance the ability to resist external electromagnetic interference, ensure stable shielding characteristics, and improve durability.

[0018] 3. By adding a galvanized steel wire armor layer between the inner cushion layer and the outer sheath, additional mechanical protection is provided, which has a certain resistance to mechanical damage, improves the mechanical strength of the cable, protects the sheath layer, and improves durability and applicability. 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-single pair of shielded twisted core, 2-TPU elastomer filled core, 3-insulated core, 4-aluminum-plastic composite tape wrapped sub-shielding layer, 5-aluminum-plastic composite tape wrapped overall shielding layer, 6-metal wire mixed overall shielding layer, 7-irradiation cross-linked linear low-density polyethylene inner lining layer, 8-galvanized steel wire armor layer, 9-irradiation cross-linked linear low-density polyethylene outer sheath layer, 10-inner conductor, 11-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 In the loosening-inhibiting total shielded armored instrument cable of the embodiment of the present application, five single-pair shielded twisted wire cores 1 are evenly distributed circumferentially around a TPU elastomer-filled core 2 and twisted together to form a cable core. Furthermore, the lay lengths of the five single-pair shielded twisted wire cores 1 are different.

[0024] The single-pair shielded twisted wire core 1 includes two insulated wire cores 3 twisted back to form a wire core body, the insulated wire core 3 includes an inner conductor 10 and an XLPE insulation layer 11, the inner conductor 10 has a diameter of 0.8mm to 1.4mm, for example, the inner conductor 10 is an annealed copper monofilament conductor or a tinned copper monofilament conductor, with a diameter of 0.8mm or 1.13mm. The inner conductor 10 is composed of a plurality of tinned copper wires with a diameter of 0.2mm to 0.5mm twisted together, with a cross-sectional area of ​​0.5mm 2 , 0.75mm 2 or 1.5mm 2 The thickness of the XLPE insulation layer 11 is 0.5 mm to 0.6 mm. The outer surface of the core body is coated with an aluminum-plastic composite tape wrapped shielding layer 4, the winding direction of the aluminum-plastic composite tape wrapped shielding layer 4 is the same as the twisting direction of the core body, and the twisting direction of the core body is the same as the twisting direction of the cable core.

[0025] The cable core is coated with an aluminum-plastic composite tape wrapped total shielding layer 5, a metal wire mixed total shielding layer 6, an irradiated cross-linked linear low-density polyethylene lining layer 7, a galvanized steel wire armor layer 8 and an irradiated cross-linked linear low-density polyethylene outer sheath layer 9 in sequence. The winding direction of the aluminum-plastic composite tape wrapped total shielding layer 5 is the same as the twisting direction of the cable core. In one embodiment, the aluminum-plastic composite tape wrapped sub-shielding layer 4 and the aluminum-plastic composite tape wrapped total shielding layer 5 are both aluminum-plastic composite tape spirally overlapped wrapped structures, and the aluminum-plastic composite tape is formed by a composite of PET film and aluminum foil. Further, the thickness of the PET film is 20μm to 250μm, and the thickness of the aluminum foil is 3μm to 80μm. The outer diameter of the irradiated cross-linked linear low-density polyethylene outer sheath layer 9 is 15mm to 24mm. In one embodiment, the metal wire mixed braided total shielding layer 6 is 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, and the metal wire mixed braided total shielding layer 6 is coated with insulating lubricating silicone grease. The thickness of the irradiated cross-linked linear low-density polyethylene lining layer 7 is 1.1 mm or 1.2 mm. The thickness of the irradiated cross-linked linear low-density polyethylene outer sheath layer 9 is 1.4 mm to 1.8 mm.

[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. The overall shielded armored instrument cable with loosening suppression is characterized by: Five single-pair shielded twisted wire cores (1) are uniformly distributed circumferentially around a TPU elastomer filling core (2) and twisted together to form a cable core, the single-pair shielded twisted wire core (1) comprising two insulated wire cores (3) that are twisted back to form a wire core body, the insulated wire core (3) comprising an inner conductor (10) and an XLPE insulation layer (11), the inner conductor (10) having a diameter of 0.8 mm to 1.4 mm, the outer surface of the wire core body being coated with an aluminum-plastic composite tape wrapped sub-shielding layer (4), the aluminum-plastic composite tape wrapped sub-shielding layer (4) being wound in the same direction as the wire core. The wire cores have the same twist direction, which is the same as the twist direction of the cable core. The cable core is coated with an aluminum-plastic composite tape wrapped overall shielding layer (5), a metal wire mixed overall shielding layer (6), an irradiated cross-linked linear low-density polyethylene lining layer (7), a galvanized steel wire armor layer (8) and an irradiated cross-linked linear low-density polyethylene outer sheath layer (9) in sequence. The aluminum-plastic composite tape wrapped overall shielding layer (5) has the same twist direction as the cable core, and the outer diameter of the irradiated cross-linked linear low-density polyethylene outer sheath layer (9) is 15 mm to 24 mm.

2. The anti-loosening type overall shielded armored instrument cable according to claim 1 is characterized in that: The inner conductor (10) is an annealed copper monofilament conductor or a tinned copper monofilament conductor.

3. The anti-loosening type overall shielded armored instrument cable according to claim 1 is characterized in that: The inner conductor (10) is composed of a plurality of tinned copper wires with a diameter of 0.2 mm to 0.5 mm twisted together.

4. The anti-loosening type overall shielded armored instrument cable according to claim 1 is characterized in that: The XLPE insulation layer (11) has a thickness of 0.5 mm to 0.6 mm.

5. The anti-loosening type overall shielded armored instrument cable according to claim 1 is characterized in that: The aluminum-plastic composite tape wrapped sub-shielding layer (4) and the aluminum-plastic composite tape wrapped overall shielding layer (5) are both aluminum-plastic composite tape spirally overlapped wrapped structures, and the aluminum-plastic composite tape is formed by a composite of PET film and aluminum foil.

6. The anti-loosening type overall shielded armored instrument cable according to claim 5, characterized in that: The thickness of the PET film is 20 μm to 250 μm, and the thickness of the aluminum foil is 3 μm to 80 μm.

7. The anti-loosening type overall shielded armored instrument cable according to claim 1 is characterized in that: The five single-pair shielded twisted wire cores (1) have different lay lengths.

8. The anti-loosening type overall shielded armored instrument cable according to claim 1, characterized in that: The metal wire mixed braided total shielding layer (6) is formed by an inner layer of aluminum-magnesium wire and an outer layer of tinned copper wire, which are mutually spirally wound and braided in opposite directions, the wire diameter of the tinned copper wire is larger than the wire diameter of the aluminum-magnesium wire, and the metal wire mixed braided total shielding layer (6) is coated with insulating lubricating silicone grease.

9. The anti-loosening type overall shielded armored instrument cable according to claim 1, characterized in that: The thickness of the radiation cross-linked linear low-density polyethylene lining layer (7) is 1.1 mm or 1.2 mm.

10. The anti-loosening type overall shielded armored instrument cable according to claim 1, characterized in that: The thickness of the radiation cross-linked linear low-density polyethylene outer sheath layer (9) is 1.4 mm to 1.8 mm.

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