Multi-core control cable capable of suppressing crosstalk of high-frequency signals

Abstract

The utility model discloses a multi-core control cable capable of inhibiting high-frequency signal crosstalk, which comprises four power wire core groups, wherein the four power wire core groups are arranged at intervals of 90 degrees in the circumferential direction through a cross-shaped isolation core frame and are twisted together to form a cable core; a polyester fiber plain woven fabric wrapping layer, a ferrite film wrapping layer, a copper-plastic composite wrapping shielding layer and a PFA sheath layer are sequentially wrapped outside the cable core, the copper-plastic composite wrapping shielding layer is of a copper-plastic composite belt spiral covering wrapping structure, a copper-plastic composite belt comprises a polyimide film base layer, copper foil is formed on the outer surface of the polyimide film base layer in an electroplating mode, and the ferrite film wrapping layer is arranged on the outer surface of the polyimide film base layer. And a plurality of gaps with the width of 10-35 microns are formed in the surface of the copper foil at equal intervals along the length direction. According to the control cable, the copper foil shielding layer can be prevented from being electrified, high-frequency signal crosstalk is effectively inhibited, the stable shielding performance is ensured, and the durability is better.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a multi-core control cable that suppresses high-frequency signal crosstalk. Background Art

[0002] Control cables are used as connecting wires between various electrical appliances, instruments, meters and automatic devices, and play the role of transmitting various electrical energy signals such as startup, operation, control, signal display, and measurement. 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 automated industrial production lines, multi-core cables are often used in robots, mobile drive systems, etc., and various cables are usually bundled together for use. 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. However, the copper-plastic composite wrapped shielding layer needs to be grounded, and the grounding operation is complicated and costly. If the grounding treatment is not used, the copper foil surface will be charged, which is easy to cause high-frequency signal crosstalk and affect normal operation. Summary of the invention

[0003] The utility model aims to solve the technical problem of providing a multi-core control cable for suppressing high-frequency signal crosstalk, which can prevent the copper foil shielding layer from being charged, effectively suppress the occurrence of high-frequency signal crosstalk, ensure stable shielding performance, and improve durability.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] A multi-core control cable for suppressing high-frequency signal crosstalk comprises four power core groups which are arranged 90 degrees apart from each other in the circumferential direction through a cross-shaped isolation core frame and twisted together to form a cable core, wherein the power core group comprises a small-diameter power core and a large-diameter power core, and the outside of the cable core is sequentially coated with a polyester fiber plain woven cloth wrapping layer, a ferrite film wrapping layer, a copper-plastic composite wrapping shielding layer and a PFA sheath layer, wherein the ferrite film wrapping layer is a ferrite film tape gap wrapping structure, and the copper-plastic composite wrapping shielding layer is a copper-plastic composite tape spirally overlapped wrapping structure, and the copper-plastic composite tape comprises a polyimide film base layer, and copper foil is electroplated on the outer surface of the polyimide film base layer, and a plurality of gaps with a width of 10 μm to 35 μm are equidistantly spaced along the length direction on the surface of the copper foil, and the angle between the length direction of the gap and the length direction of the copper foil is 30 degrees to 150 degrees.

[0006] Preferably, the spacing between the gaps is 100 μm to 450 μm.

[0007] Preferably, the gap width is 15 μm to 30 μm.

[0008] Preferably, the overlap rate of the copper-plastic composite tape is 15% to 35%.

[0009] Preferably, the thickness of the polyimide film base layer is 20 μm to 50 μm.

[0010] Preferably, the copper foil has a thickness of 8 μm to 30 μm.

[0011] Preferably, the small-diameter power core and the large-diameter power core both include a power core conductor and a PFA insulation layer.

[0012] Preferably, the power line core conductor is a circular conductor structure formed by twisting and pressing a number of soft copper wires, and the diameter of the soft copper wire is 0.01 mm to 0.08 mm.

[0013] Preferably, the polyester fiber plain woven fabric wrapping layer has a thickness of 120 μm to 350 μm.

[0014] Preferably, the ferrite film has a bandwidth of 1 mm to 5 mm.

[0015] The beneficial effects of the utility model are as follows:

[0016] 1. By improving the structure of the copper-plastic composite wrapped shielding layer, gaps with a width of 10μm to 35μm and equidistantly spaced along the length direction are formed on the surface of the copper foil. The angle between the length direction of the gap and the length direction of the copper foil is 30 degrees to 150 degrees, the spacing between the gaps is 100μm to 450μm, and the overlap rate of the copper-plastic composite tape is 15% to 35%. When the shielding layer is wrapped, there is no need for grounding treatment, which reduces the process cost, can effectively prevent the copper foil surface from being charged, is conducive to suppressing the occurrence of high-frequency signal crosstalk, ensures stable shielding performance, and has better durability.

[0017] 2. By adding a ferrite film wrapping layer with a gap wrapping structure between the polyester fiber plain woven cloth wrapping layer and the copper-plastic composite wrapping shielding layer, it is helpful to alleviate the stress concentration of the copper foil. The thermal expansion coefficient deviation between the polyimide film of the copper-plastic composite wrapping shielding layer and the copper foil is small. When the cable is in working condition, it is helpful to inhibit excessive thermal expansion of the copper foil layer, alleviate thermal stress, and avoid cracking of the copper foil layer, thereby ensuring stable and reliable shielding performance and better durability.

[0018] 3. The use of PFA insulation layer on small-diameter power cores and large-diameter power cores can reduce the dielectric constant and dielectric loss, which is beneficial to reducing capacitance and attenuation, improving the sliding between the insulation layer and the power core conductor, reducing the local stress concentration of the power core conductor, reducing torque, reducing the deformation and wire breakage of the power core conductor, improving the bending resistance of the cable, and improving durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the copper-plastic composite belt of an embodiment of the utility model.

[0022] In the figure: 1-power line core group, 2-cross-shaped isolation core frame, 3-small-diameter power line core, 4-large-diameter power line core, 5-polyester fiber plain woven cloth winding layer, 6-ferrite film winding layer, 7-copper plastic composite winding shielding layer, 8-PFA sheath layer, 9-polyimide film base layer, 10-copper foil, 11-gap, 12-power line core conductor, 13-PFA insulation layer. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the utility model, the utility model is further described below in conjunction with preferred embodiments and drawings. Similar components in the drawings are represented by the same reference numerals. Those skilled in the art should understand that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the utility model.

[0024] See also Figure 1 The multi-core control cable for suppressing high-frequency signal crosstalk of an embodiment of the utility model comprises four power core groups 1 which are arranged 90 degrees apart from each other in the circumferential direction through a cross-shaped isolation core frame 2 and twisted together to form a cable core. The power core group 1 comprises a small-diameter power core 3 and a large-diameter power core 4. Specifically, the small-diameter power core 3 and the large-diameter power core 4 both comprise a power core conductor 12 and a PFA insulation layer 13. Furthermore, the power core conductor 12 is a circular conductor structure formed by twisting and pressing a plurality of soft copper wires, and the diameter of the soft copper wire is 0.01 mm to 0.08 mm.

[0025] The cable core is coated with a polyester fiber plain woven fabric wrapping layer 5, a ferrite film wrapping layer 6, a copper-plastic composite wrapping shielding layer 7 and a PFA sheath layer 8 in sequence. The thickness of the polyester fiber plain woven fabric wrapping layer 5 is 120 μm to 350 μm. The ferrite film wrapping layer 6 is a ferrite film tape gap wrapping structure, and further, the ferrite film tape width is 1 mm to 5 mm. The copper-plastic composite wrapping shielding layer 7 is a copper-plastic composite tape spirally overlapped wrapping structure, and further, the copper-plastic composite tape overlap rate is 15% to 35%. Figure 2 As shown in , the copper-plastic composite tape includes a polyimide film base layer 9, and a copper foil 10 is electroplated on the outer surface of the polyimide film base layer 9. Further, the thickness of the polyimide film base layer 9 is 20μm to 50μm, and the thickness of the copper foil 10 is 8μm to 30μm. A plurality of slits 11 with a width of 10μm to 35μm are equidistantly spaced along the length direction on the surface of the copper foil 10. Preferably, the width of the slits 11 is 15μm to 30μm. Further, the spacing between the slits 11 is 100μm to 450μm. The angle between the length direction of the slit 11 and the length direction of the copper foil 10 is 30 degrees to 150 degrees.

[0026] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. Multi-core control cable for suppressing high-frequency signal crosstalk, characterized by: The invention comprises four power line core groups (1) which are arranged 90 degrees apart from each other in the circumferential direction through a cross-shaped isolation core frame (2) and twisted together to form a cable core. The power line core group (1) comprises a small-diameter power line core (3) and a large-diameter power line core (4). The cable core is coated with a polyester fiber plain woven cloth wrapping layer (5), a ferrite film wrapping layer (6), a copper-plastic composite wrapping shielding layer (7) and a PFA sheath layer (8) in sequence on the outside. The ferrite film wrapping layer (6) is a ferrite film with gap wrapping structure. The copper-plastic composite wrapped shielding layer (7) is a copper-plastic composite tape spirally overlapped wrapped structure, the copper-plastic composite tape comprises a polyimide film base layer (9), a copper foil (10) is electroplated on the outer surface of the polyimide film base layer (9), a plurality of slits (11) with a width of 10 μm to 35 μm are equidistantly spaced along the length direction on the surface of the copper foil (10), and the angle between the length direction of the slits (11) and the length direction of the copper foil (10) is 30 degrees to 150 degrees.

2. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 1 is characterized in that: The spacing between the gaps (11) is 100 μm to 450 μm.

3. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 1 is characterized in that: The width of the gap (11) is 15 μm to 30 μm.

4. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 1 is characterized in that: The overlap rate of the copper-plastic composite tape is 15% to 35%.

5. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 1 is characterized in that: The polyimide film base layer (9) has a thickness of 20 μm to 50 μm.

6. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 1 is characterized in that: The copper foil (10) has a thickness of 8 μm to 30 μm.

7. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 1 is characterized in that: The small-diameter power line core (3) and the large-diameter power line core (4) both comprise a power line core conductor (12) and a PFA insulation layer (13).

8. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 7 is characterized in that: The power line core conductor (12) is a plurality of soft copper wires twisted and pressed to form a circular conductor structure, and the diameter of the soft copper wire is 0.01 mm to 0.08 mm.

9. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 1 is characterized in that: The polyester fiber plain woven fabric wrapping layer (5) has a thickness of 120 μm to 350 μm.

10. The multi-core control cable for suppressing high-frequency signal crosstalk according to claim 1, characterized in that: The ferrite film has a bandwidth of 1 mm to 5 mm.

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