Noise-resistant bending-resistant multi-core shielding cable

Abstract

The utility model discloses a noise-resistant bending-resistant multi-core shielding cable, which comprises two power supply wire cores and two control wire cores, wherein the two power supply wire cores and the two control wire cores are arranged in a cross shape and are jointly twisted with a para-position type wholly aromatic copolyamide stretching fiber filling core material to form a cable core; a PET resin wrapping layer, an aluminum-plastic composite belt wrapping shielding layer, a metal wire mixed weaving shielding layer and an irradiation crosslinking linear low density polyethylene outer sheath layer are sequentially wrapped outside the cable core, and the winding distance of the aluminum-plastic composite belt wrapping shielding layer is larger than that of the PET resin wrapping layer. The metal wire mixed-braided shielding layer is formed by reversely and spirally winding and braiding inner-layer aluminum-magnesium wires and outer-layer tinned copper wires, and the winding distance of the inner-layer aluminum-magnesium wires and the winding distance of the outer-layer tinned copper wires are both 14-35 mm and are three to five times of the outer diameter of the aluminum-plastic composite belt wrapped shielding layer. The cable is better in bending resistance, better in noise resistance and durable in application, and core and wire breakage of the conductor and the shielding layer is avoided.

Description

Technical Field

[0001] The present application belongs to the field of cable technology, and in particular relates to a noise-resistant and bending-resistant multi-core shielded cable. Background Art

[0002] In automated industrial production lines, multi-core cables are often used in robots, mobile drive systems, etc. The cable core is usually a circular cross-section structure formed by twisting the power line core, control line core and filling core material. Multi-core cables need to have good flexibility and shielding performance, and must also have good electrical characteristics for long-distance transmission. Under normal working conditions, multi-core cables need to withstand repetitive bending movements. The outer diameters of the cores are different and the bending resistance is poor. After repeated bending, the extrusion pressure from the filling core material can easily cause the circular cross-section structure of the cable core to deform, and the extrusion pressure between the cores can easily cause the wires to break. In addition, the total shielding layer of the cable mostly adopts a copper wire braided shielding layer structure. The copper wire diameter is generally not more than 0.2mm. After repeated bending, the shielding layer is prone to breakage, resulting in unstable shielding effect and poor noise resistance. It cannot fully and effectively suppress the leakage of internal signals or noise to the outside and suppress interference from external signals, which seriously affects the electrical characteristics of the cable and has poor durability. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by the present application is to provide a noise-resistant and bending-resistant multi-core shielded cable, optimize the cable core and shielding layer structure, improve the bending resistance, avoid the occurrence of core and wire breakage of the conductor and the shielding layer, ensure stable shielding performance, better noise resistance, and improve durability.

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

[0005] The noise-resistant and bending-resistant multi-core shielded cable comprises two power cores and two control cores arranged in a cross shape and twisted together with a para-type fully aromatic copolyamide stretched fiber filling core material to form a cable core, wherein the cable core twisting pitch is 28 mm to 70 mm, and the cable core is coated with a PET resin wrapping layer, an aluminum-plastic composite tape wrapping shielding layer, a metal wire mixed shielding layer and an irradiated cross-linked linear low-density polyethylene outer sheath layer in sequence, wherein the winding direction of the aluminum-plastic composite tape wrapping shielding layer is opposite to that of the PET resin wrapping layer, and the aluminum The winding pitch of the plastic composite tape wrapped shielding layer is greater than the winding pitch of the PET resin wrapped layer, and the metal wire mixed 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 winding pitch of the inner layer of aluminum-magnesium wire and the winding pitch of the outer layer of tinned copper wire are both 14mm to 35mm and are three to five times the outer diameter of the aluminum-plastic composite tape wrapped shielding layer. The winding pitch of the inner layer of aluminum-magnesium wire and the winding pitch of the outer layer of tinned copper wire are both smaller than the cable core lay pitch, and the wire diameter of the inner layer of aluminum-magnesium wire is greater than 0.1mm and smaller than the wire diameter of the outer layer of tinned copper wire.

[0006] Preferably, the winding direction of the PET resin wrapping layer is the same as the twisting direction of the cable core.

[0007] Preferably, the aluminum-plastic composite tape wrapped shielding layer is an aluminum-plastic composite tape spirally overlapped wrapped structure with an overlap rate of not less than 25%, and the aluminum-plastic composite tape comprises a PET film, and an aluminum foil layer is provided on the inner surface of the PET film.

[0008] Preferably, the power cord core comprises a power cord core conductor and a radiation cross-linked low-density polyethylene insulation layer.

[0009] Preferably, the core conductor of the power cord is composed of a plurality of tinned copper monofilaments with a diameter of 0.1 mm to 0.2 mm twisted together.

[0010] Preferably, the control core is composed of two insulated cores twisted in pairs, the two control cores have the same twist direction and different twist pitches, the axial line connecting the two insulated cores of one control core is arranged parallel to the axial line connecting the two power cores, and the axial line connecting the two insulated cores of the other control core is arranged perpendicular to the axial line connecting the two power cores.

[0011] Preferably, the insulated core comprises an inner conductor and an XLPE insulation layer.

[0012] Preferably, the inner conductor is composed of a number of tinned copper monofilaments with a wire diameter of 0.05 mm to 0.1 mm, which are coaxially twisted.

[0013] Preferably, the control wire core lay direction is the same as the cable core lay direction.

[0014] Preferably, the PET resin wrapping layer is a multi-layer overlapping wrapping structure of PET resin tapes, and the thickness of the PET resin tapes is 8 μm to 20 μm.

[0015] Beneficial effects of this application:

[0016] 1. By adding a PET resin wrapping layer between the cable core and the aluminum-plastic composite tape wrapped shielding layer, the conductivity of PET is higher, and the winding direction of the PET resin wrapping layer is the same as the twisting direction of the cable core. During the cable bending process, it is beneficial to suppress the loosening of the control core, which is beneficial to reduce the influence of interference between the two insulating cores of the control core, enhance the ability to resist external electromagnetic interference, improve noise resistance, ensure stable shielding characteristics, and have better durability.

[0017] 2. By optimizing the shielding layer structure, the winding direction of the aluminum-plastic composite tape wrapped shielding layer is opposite to that of the PET resin wrapped layer, and the winding distance of the aluminum-plastic composite tape wrapped shielding layer is greater than that of the PET resin wrapped layer, which helps prevent the aluminum-plastic composite tape wrapped shielding layer from loosening, ensures a stable overlap rate, and improves noise resistance. The PET film of the aluminum-plastic composite tape wrapped shielding layer helps reduce stress concentration in the metal wire mixed shielding layer and reduces torque. The metal wire mixed shielding layer adopts a tinned copper wire and aluminum-magnesium wire braided structure in which they are spirally wound in opposite directions. The tinned copper wire has strong rigidity and better conductivity. The shielding layer formed by spirally winding tinned copper wire and aluminum-magnesium wire in opposite directions 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, and the diameter of the inner aluminum-magnesium wire is greater than 0.1mm, which is beneficial to suppress wire breakage in the shielding layer when the cable is bent. The winding distance of the inner aluminum-magnesium wire and the outer tinned copper wire are both 14mm to 35mm and are three to five times the outer diameter of the aluminum-plastic composite tape wrapped shielding layer. The winding distance of the inner aluminum-magnesium wire and the outer tinned copper wire are both smaller than the cable core lay pitch, which is beneficial to prevent the surface resistance of the shielding layer from increasing, ensure the stability of the shielding performance, improve noise resistance, and have better durability.

[0018] 3. By adding a para-type fully aromatic copolyamide stretched fiber filling core material between the power line core and the control line core to form a buffer to maintain the circular cross-sectional structure of the cable core, it helps to reduce the extrusion force and lateral pressure when the cable is repeatedly bent, improve the bending resistance, reduce the local stress concentration of each core, inhibit the breakage of each core conductor, and improve the 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-power line core, 2-control line core, 3-para-type fully aromatic copolyamide stretched fiber filling core material, 4-PET resin winding layer, 5-aluminum-plastic composite tape winding shielding layer, 6-metal wire mixed shielding layer, 7-irradiation cross-linked linear low-density polyethylene outer sheath layer, 8-power line core conductor, 9-irradiation cross-linked low-density polyethylene insulation layer, 10-insulated wire core, 11-inner conductor, 12-XLPE insulation layer. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0023] See also Figure 1 The noise-resistant and bend-resistant multi-core shielded cable of the embodiment of the present application includes two power cores 1 and two control cores 2 arranged in a cross shape and twisted together with a para-type fully aromatic copolyamide stretched fiber filling core material 3 to form a cable core, and the cable core twist pitch is 28mm to 70mm. Specifically, the power core 1 includes a power core conductor 8 and an irradiated cross-linked low-density polyethylene insulation layer 9. Further, the power core conductor 8 is composed of a plurality of tinned copper monofilaments with a diameter of 0.1mm to 0.2mm twisted together. The control core 2 is composed of two insulated cores 10 twisted together, and the insulated core 10 includes an inner conductor 11 and an XLPE insulation layer 12. Further, the inner conductor 11 is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.05mm to 0.1mm twisted together. The two control cores 2 have the same lay direction and different lay lengths, the axis connecting the two insulating cores 10 of one control core 2 is arranged parallel to the axis connecting the two power cores 1, and the axis connecting the two insulating cores 10 of the other control core 2 is arranged perpendicular to the axis connecting the two power cores 1. The lay direction of the control core 2 is the same as that of the cable core.

[0024] The cable core is coated with a PET resin wrapping layer 4, an aluminum-plastic composite tape wrapping shielding layer 5, a metal wire mixed shielding layer 6 and an irradiated cross-linked linear low-density polyethylene outer sheath layer 7 in sequence. The winding direction of the PET resin wrapping layer 4 is the same as the twisting direction of the cable core. In one embodiment, the PET resin wrapping layer 4 is a multi-layer overlapping wrapping structure of PET resin tape, and the thickness of the PET resin tape is 8μm to 20μm. The winding direction of the aluminum-plastic composite tape wrapping shielding layer 5 is opposite to that of the PET resin wrapping layer 4, and the winding distance of the aluminum-plastic composite tape wrapping shielding layer 5 is greater than the winding distance of the PET resin wrapping layer 4. In one embodiment, the aluminum-plastic composite tape wrapping shielding layer 5 is an aluminum-plastic composite tape spiral overlapping wrapping structure with an overlapping rate of not less than 25%, and the aluminum-plastic composite tape includes a PET film, and an aluminum foil layer is provided on the inner surface of the PET film. The metal wire mixed shielding layer 6 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 winding pitch of the inner layer of aluminum-magnesium wire and the winding pitch of the outer layer of tinned copper wire are both 14mm to 35mm and are three to five times the outer diameter of the aluminum-plastic composite tape wrapped shielding layer 5. The winding pitch of the inner layer of aluminum-magnesium wire and the winding pitch of the outer layer of tinned copper wire are both smaller than the cable core lay pitch. The wire diameter of the inner layer of aluminum-magnesium wire is greater than 0.1mm and smaller than the wire diameter of the outer layer of tinned copper wire.

[0025] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. Noise-resistant and anti-bending multi-core shielded cable, characterized by: The invention comprises two power line cores (1) and two control line cores (2) arranged in a cross shape and twisted together with a para-type fully aromatic copolyamide stretched fiber filling core material (3) to form a cable core, wherein the cable core twisting distance is 28 mm to 70 mm, and the cable core is coated with a PET resin wrapping layer (4), an aluminum-plastic composite tape wrapping shielding layer (5), a metal wire mixed braided shielding layer (6) and an irradiated cross-linked linear low-density polyethylene outer sheath layer (7) in sequence, wherein the winding direction of the aluminum-plastic composite tape wrapping shielding layer (5) is opposite to that of the PET resin wrapping layer (4), and the aluminum-plastic composite tape wrapping shielding layer (5) is opposite to that of the PET resin wrapping layer (4). The winding pitch of the aluminum-plastic composite tape wrapped shielding layer (5) is greater than the winding pitch of the PET resin wrapped layer (4); the metal wire mixed shielding layer (6) is composed of an inner layer of aluminum-magnesium wire and an outer layer of tinned copper wire, which are woven in a counter-rotating spiral; the winding pitch of the inner layer of aluminum-magnesium wire and the winding pitch of the outer layer of tinned copper wire are both 14 mm to 35 mm and are three to five times the outer diameter of the aluminum-plastic composite tape wrapped shielding layer (5); the winding pitch of the inner layer of aluminum-magnesium wire and the winding pitch of the outer layer of tinned copper wire are both less than the cable core twist pitch; the wire diameter of the inner layer of aluminum-magnesium wire is greater than 0.1 mm and less than the wire diameter of the outer layer of tinned copper wire.

2. The noise-resistant and bend-resistant multi-core shielded cable according to claim 1, characterized in that: The winding direction of the PET resin wrapping layer (4) is the same as the twisting direction of the cable core.

3. The noise-resistant and bend-resistant multi-core shielded cable according to claim 1, characterized in that: The aluminum-plastic composite tape wrapped shielding layer (5) is an aluminum-plastic composite tape spirally overlapped wrapped structure with an overlap rate of not less than 25%. The aluminum-plastic composite tape comprises a PET film, and an aluminum foil layer is provided on the inner surface of the PET film.

4. The noise-resistant and bend-resistant multi-core shielded cable according to claim 1, characterized in that: The power line core (1) comprises a power line core conductor (8) and a radiation cross-linked low-density polyethylene insulation layer (9).

5. The noise-resistant and bend-resistant multi-core shielded cable according to claim 4, characterized in that: The power line core conductor (8) is composed of a plurality of tinned copper monofilaments with a diameter of 0.1 mm to 0.2 mm twisted together.

6. The noise-resistant and bend-resistant multi-core shielded cable according to claim 1, characterized in that: The control wire core (2) is composed of two insulated wire cores (10) twisted in pairs, the two control wire cores (2) have the same twist direction and different twist pitches, the axis connection line of the two insulated wire cores (10) of one control wire core (2) is arranged in parallel with the axis connection line of the two power wire cores (1), and the axis connection line of the two insulated wire cores (10) of the other control wire core (2) is arranged perpendicular to the axis connection line of the two power wire cores (1).

7. The noise-resistant and bend-resistant multi-core shielded cable according to claim 6, characterized in that: The insulated wire core (10) comprises an inner conductor (11) and an XLPE insulation layer (12).

8. The noise-resistant and bend-resistant multi-core shielded cable according to claim 7, characterized in that: The inner conductor (11) is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.05 mm to 0.1 mm, which are coaxially twisted.

9. The noise-resistant and bend-resistant multi-core shielded cable according to claim 6, characterized in that: The twist direction of the control core (2) is the same as that of the cable core.

10. The noise-resistant and bend-resistant multi-core shielded cable according to claim 1, characterized in that: The PET resin wrapping layer (4) is a multi-layer overlapping wrapping structure of PET resin tapes, and the thickness of the PET resin tapes is 8 μm to 20 μm.

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