CN115602360A - Highly shielded flexible power cable and preparation method thereof - Google Patents

Abstract

The present invention relates to the technical field of power cables, in particular to a highly shielded flexible power cable and a preparation method thereof. In the twisting gap of the wire core; the wrapping tape is wrapped on the outer wall of the filling rope, the inner lining is extruded on the outer wall of the wrapping belt; the shielding layer is wrapped on the outer wall of the inner lining ; The braiding density of the double-layer braided shield is sparse and alternately distributed along the axial direction of the cable core and the radial direction of the cable core. In this way, the part with a sparse braided mesh and the part with a dense braided mesh overlap each other, and the outer braided mesh The braided mesh is covered on the mesh of the inner braided mesh, which reduces the mesh gap and improves the shielding coverage of the braided shielding layer. Because the braided layer is alternately woven with sparse weaving density, the cable is softer after cabled, and because of the sparse Alternate coverage can still achieve the narrowing of the woven mesh gap.

Description

Highly shielded flexible power cable and preparation method thereof

technical field

The invention relates to the technical field of power cables, in particular to a highly shielded flexible power cable and a preparation method thereof.

Background technique

A shielded cable is a signal transmission cable that uses a metal mesh braid to wrap the signal line. For example, industrial robots used in production lines such as automobile welding and component assembly use signal transmission cables that suppress electromagnetic interference, power cables, or the like. The composite cable realizes the transmission of power and/or control signals, among which the cables used in industrial robots must suppress electromagnetic interference, usually cables with shielding, braided shielding or composite shielding.

In order to improve the shielding performance of the cable in the prior art, a multi-layer braided shielding layer design is proposed to enhance the shielding performance of the cable. For example, cables used in industrial robots are used for wiring of movable parts (joint motions of multi-axis arms), and need to withstand repeated bending and torsion. Therefore, if the braided shielding layer is multi-layered, compared with single-layer braiding, the strength and hardness of the cable are increased, but the bending resistance and torsion resistance are reduced. Although the performance of suppressing electromagnetic interference is enhanced, it is also reduced. Bending and torsion resistance.

Prior art literature:

Patent Document 1: CN112951500A An Environmentally Friendly Low Smoke Halogen Free Flame Retardant Power Cable

Patent document 2: CN114678176A A preparation method of a cable with anti-magnetic and anti-interference functions

Contents of the invention

The purpose of the present invention is to address the defects of the prior art. The first aspect of the present invention proposes a technical solution, a highly shielded flexible power cable, including:

Wire cores, a plurality of said wire cores are tangent to each other and twisted with each other;

A filling rope, filled in the stranding gaps of the plurality of wire cores;

Wrapping tape, wrapped around the outer wall of the filling rope, so that the wire core and the filling rope are wound together by the wrapping tape to form a cable core with a circular cross-section;

The inner lining layer is extruded on the outer wall of the wrapping belt;

The shielding layer is coated on the outer wall of the inner lining layer;

The outer sheath is extruded on the outer wall of the shielding layer;

Wherein, the shielding layer includes an inner braided layer and an outer braided layer, the inner braided layer covers the outer wall of the inner lining layer, and the outer braided layer covers the outer wall of the inner braided layer;

Both the inner braided layer and the outer braided layer include first braided parts and second braided parts alternately distributed along the axial direction of the cable core, and the braided density of the first braided part is greater than that of the second braided part. Braiding density, the first braided portion and the second braided portion are alternately distributed along the radial direction of the cable core.

Preferably, the inner braiding layer includes a first braiding portion and a second braiding portion alternately distributed along the axial direction of the cable core, the braiding density of the first braiding portion is greater than that of the second braiding portion, so The outer braiding layer includes third braiding parts and fourth braiding parts alternately distributed along the axial direction of the cable core, and the braiding density of the third braiding parts is smaller than that of the fourth braiding parts.

Preferably, the weaving density of the first weaving part is the same as that of the fourth weaving part, and the weaving density is 90%-95%, and the weaving density of the second weaving part and the third weaving part is the same, and the weaving density is 40% %-60%.

Preferably, both the inner braided layer and the outer braided layer include braided strips braided by a plurality of bare metal wires in a crossing manner.

Preferably, the bare metal wire includes copper wire, copper alloy wire, tinned copper wire or tinned copper alloy wire.

Preferably, the outer braiding layer includes a braided strip braided by a plurality of bare metal wires and copper foil wires in a crossing manner.

Preferably, the wire core includes a conductor, and an outer wall of the conductor is extruded with an insulating layer.

Preferably, the filling rope includes TPR/SBS/TPE elastomer with a circular cross section.

Preferably, the inner liner includes a polyethylene inner sheath, and the extruded thickness is 0.1-0.3 mm.

Preferably, the outer sheath includes a polyvinyl chloride outer sheath with an extruded thickness of 1.5-2.6mm.

The second aspect of the present invention proposes a technical solution, a method for preparing a highly shielded flexible power cable, comprising the following steps:

Step 1, preparing the core, including the following steps:

1.1) Conductor preparation: multiple pure oxygen-free copper ultra-fine copper wires are stranded in a normal way of 1+6+12 through a stranding machine to form a conductor unit with a circular cross section;

1.2) Preparing the insulating layer: extruding the cross-linked polyethylene insulating material on the outer wall of the conductor unit with a thickness of 0.2mm-0.5mm through an extrusion machine to complete the preparation of the insulating core.

Step 2, preparing the filling rope: using TPR/SBS/TPE elastomer material to extrude the filling rope with a circular cross-section through a tube extruder;

Step 3. Prepare the cable core: Arrange multiple wire cores tangentially in pairs, and twist each other through a twisting machine to form a twisted structure, and fill the gaps of the twisted structure with the filling rope with a circular cross section , and finally wrap the outer wall of the filling rope with a non-woven fabric tape in the right direction, and fix the cable core into a circular cross-section;

Step 4, preparing the inner lining layer: extruding polyethylene material on the outer wall of the cable core through an extruder to form the inner lining layer, and the extruded thickness is 0.15mm-0.30mm;

Step 5, prepare shielding layer, comprise the steps:

5.1), preparation of the inner braided layer: use bare metal wires to weave a densely woven tape with a certain width and a density of 90%-95% along the length direction of the braided tape in a cross braided manner, and on one side of the densely woven tape along its In the length direction, metal bare wires are used to weave and connect sparse braided belts with a braiding density of 40%-60% in a cross braided manner to form the inner braided layer;

5.2), prepare the outer braided layer: use the bare metal wire to weave a certain width of the sparse braided tape with a density of 40%-60% along the length direction of the braided tape in a cross braided manner, In the length direction, metal bare wires are used to weave and connect densely woven belts with a weaving density of 90%-95% in a cross-braiding manner to form the outer braided layer;

5.3) Wrapping the shielding layer: first wrap the inner braided layer formed by weaving in the above step 5.1 to the outer wall of the inner lining layer in the right direction, and then weave the outer layer formed by weaving in the above step 5.2 The layers are right-wrapped on the outer wall of the inner braided layer, and the inner braided layer and the dense braided part in the outer braided layer overlap each other;

Step 6. Prepare the outer sheath: Extrude and wrap the outer wall of the shielding layer with polyvinyl chloride material, and the extruded thickness is 0.8mm-1.5mm.

Preferably, the bare metal wire includes any one of copper wire, copper alloy wire, tinned copper wire or tinned copper alloy wire.

Preferably, the braiding angle between the inner braiding layer and the axial direction of the cable is greater than 45 degrees, and the braiding angle between the outer braiding layer and the axial direction of the cable is less than 45 degrees.

Preferably, the braiding angle between the inner braiding layer and the axial direction of the cable is less than 45 degrees, and the braiding angle between the outer braiding layer and the axial direction of the cable is greater than 45 degrees.

Preferably, the weaving widths of the densely woven part and the sparsely woven part in the inner braided layer and the outer braided layer are the same.

Compared with the prior art, the present invention has the advantages of:

Double-layer braided shielding is used to change the weaving density of the braided mesh in the double-layered braided shielding, so that the double-layered braided mesh is covered on the cable core, and the braiding density is sparse and alternately distributed along the axial direction of the cable core and the radial direction of the cable core. , In this way, the part with sparse woven mesh density and the part with dense woven mesh density overlap each other, and the woven mesh wire of the outer woven mesh covers the mesh of the inner woven mesh, which reduces the mesh gap and improves the braided shielding layer. The shielding coverage rate is high, because the braiding layer is alternately braided with sparse weaving density, the cable is softer after cabling, and the gap between the braided meshes can still be reduced due to the sparse and alternate coverage. Therefore, compared with the prior art, the use of double-layer The same density braiding layer forms double-braided shielding, which makes the cable more flexible while having high shielding performance.

Description of drawings

The figures are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like reference numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of the various aspects of the invention will now be described by way of example with reference to the accompanying drawings, in which:

Fig. 1 is a cross-sectional view of a highly shielded flexible power cable shown in an embodiment of the present invention;

Fig. 2 is an axial view of a highly shielded flexible power cable shown in an embodiment of the present invention;

Fig. 3 is a partial detailed view of the inner braided belt shown in the embodiment of the present invention;

Fig. 4 is a partial detailed view of the outer braided belt shown in the embodiment of the present invention;

Fig. 5 is a schematic diagram of test results of a bending test of a cable according to an embodiment of the present invention.

In the figure, the meaning of each reference mark is as follows:

1. Wire core; 11. Conductor; 12. Insulation layer; 2. Filling rope; 3. Wrapping tape; 4. Inner lining layer; 5. Shielding layer; 51. Inner braiding layer; 52. Outer braiding layer; 511 , the first weaving part; 512, the second weaving part; 521, the third weaving part; 522, the fourth weaving part; 6, the outer sheath.

detailed description

In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

A high-shielding flexible power cable shown in the present invention aims to solve the problem that the existing double-layer braided shielding of the shielded cable is covered by inner and outer braiding of the shielding tape with the same braiding density, which leads to an increase in the hardness of the cable after being cabled. Existing woven mesh shields cannot provide 100% coverage because there are always some small gaps in the woven structure after they are woven and covered. According to the tightness of weaving, the braided mesh can usually provide a coverage of 70%-95%. For cables that are fixedly laid, the 70% shielding coverage achieved by a single layer of braided shielding is sufficient for cable laying applications. However, for For cables used in the wiring of movable parts such as industrial robots, the requirements for shielding coverage are higher. Therefore, in the prior art, double-layer braided shielding is used to improve shielding coverage. The second layer of braided mesh can cover The mesh of the first layer of braided mesh narrows the gap between the meshes of the shielding layer, thereby expanding the coverage of the braided mesh and improving the shielding effect of the cable. But adopt the same high-density double-layer braided net, when the second layer of braided net covers the first layer of braided net, there is a large amount of overlapping situation of braided mesh wire, and the dwindling of braided mesh gap has no effect on the overlapping of braided mesh wire. To the effect, and increased the hardness and weight of the cable.

【Highly shielded flexible power cable】

As shown in Figures 1-4, the first aspect of the present invention proposes a technical solution, a highly shielded flexible power cable, including a core 1, a filling rope 2, a wrapping tape 3, an inner liner 4, a shielding layer 5 and Outer sheath6.

Core

Among them, the wire core 1 , a plurality of wire cores 1 are arranged tangentially and twisted to each other, and the wire core 1 includes a conductor 11 and an insulating layer 12 extruded on the outer wall of the conductor 11 .

This embodiment takes four wire cores 1 as an example for illustration. As shown in FIG. 1 and FIG. 2 , the four wire cores 1 are tangent to each other and twisted with each other. Furthermore, the conductor 11 is formed by twisting a plurality of pure oxygen-free copper ultra-fine copper wires in a regular manner of 1+6+12. The oxygen-free copper ultra-fine copper wires have strong flexibility and good bending resistance. The conductor 11 has good flexibility and bending resistance.

Specifically, the stranding pitch of the conductor 11 is 10-14 times the outer diameter of the conductor 11. If the stranding pitch is less than 10 times the outer diameter of the conductor 11, although the bending resistance can be improved, the outer diameter of the conductor 11 is thinner. It will make its torsion resistance worse, and the twisting pitch is greater than 14 times the outer diameter of the conductor 11. Although the torsion can be improved, the outer diameter of the conductor 11 increases, resulting in poor bending resistance. Therefore, in order to take into account the bending resistance The twisting pitch is 10 times to 14 times the outer diameter of the conductor 11 in order to improve the performance and torsion resistance.

Furthermore, the insulating layer 12 is extruded on the outer wall of the conductor 11 with cross-linked polyethylene insulating material through an extruder. The cross-linked polyethylene insulating material has unique insulating properties, excellent mechanical properties and heat resistance.

stuffing rope

As shown in FIG. 1 , the filling rope 2 is filled in the stranding gap between multiple wire cores 1 and a reinforcing core 13 .

In an optional embodiment, the filling rope 2 can be made of TPR/SBS/TPE elastomer material, which is extruded into a circular section by an extruder. The TPR/SBS/TPE elastomer material has good elasticity and flexibility. The filling rope 2 extruded from TPR/SBS/TPE elastomer material is filled in the stranding gap between multiple wire cores 1 and a reinforcing core 13, so that the cross-section of the cable core after cable is more rounded.

In another embodiment, the filling rope 2 can be made of TPR/SBS/TPE elastomer material, which is extruded into a hollow tube structure through a tube extruder. The hollow structure can provide radial compression space, so that the cable can be bent or When twisted, there is an elastic contraction distance between the wire cores 1 . In this way, the cabled cable has higher flexibility and better torsion resistance performance, and can adapt to the bending and torsion movement of the mechanical arm when it moves.

wrapping tape

The wrapping tape 3 is preferably a wrapping tape made of a commercially available elastic non-woven material, and is wrapped rightward around the outer wall of the filling rope 2 .

Thus, by wrapping the wrapping tape 3, the core 1 and the filling rope 2 are wrapped together to form a cable core with a circular cross-section, which is wrapped in 2 layers, wherein the covering rate of the wrapping is greater than 20%.

Lining

The inner liner 4 preferably adopts polyethylene material to be extruded on the outer wall of the wrapping tape 3 by an extruder. Polyethylene is non-toxic, tasteless, and has good insulation. As the inner liner 4, it is extruded on the wrapping tape 3 The outer wall of the outer layer can prevent the metal wire of the outer metal braiding shield from piercing the insulation of the core 1 when it is bent and twisted, so as to play the role of insulation protection.

Specifically, the thickness of the lining layer 4 is 0.15-0.30 mm.

Shield

The shielding layer 5 as an embodiment of the present invention includes an inner braided layer 51 and an outer braided layer 52, the inner braided layer 51 is wrapped around the outer wall of the inner lining layer 4, and the outer braided layer 52 is wrapped around the inner layer The outer wall of the braided layer 51.

In order to solve the problem that the hardness of the cable increases after being covered by a multi-layer braided shielding layer, the braids of the two braided layers are braided in a crosswise manner by a braiding machine using a dense and interlaced braided structure, and the inner braided layer 51 and the outer braided layer The layers 52 each include at least one set of densely woven parts and sparsely woven parts arranged side by side, and the densely woven parts of the two layers of braided layers are alternately distributed.

Compared with the double-layer braided tape with the same density, the braided shielding tape formed by interlacing weaving of dense and dense is used in this embodiment, which has better softness than the braided shielding tape with uniform weaving density, and the braided shielding layer 5 formed after wrapping can be While ensuring high shielding and anti-interference performance, the hardness of the shielding layer 5 is reduced, so that the cable has better flexibility after being cabled.

In an optional embodiment, both the inner braiding layer 51 and the outer braiding layer 52 are braided in a crossing manner using a plurality of bare metal wires (copper wires, copper alloy wires, tinned copper wires or tinned copper alloy wires) Made of braided belt. When weaving, weave a densely woven belt with a certain width and a density of 90%-95% along the length direction of the braided belt in the way of cross braiding, and then weave and densely weave on one side of the densely woven belt along its length direction. The braiding density is 40%-60% and the braiding density is 40%-60%. The braided shielding tape is formed by alternately braiding the sparse weaving part and the dense weaving part along the width direction of the braiding tape.

Further, in order to improve the coverage rate of the mesh wire and the mesh of the outer braided layer 52 and the inner braided layer 51, the gap between the braided meshes of the shielding layer 5 is reduced, and the shielding coverage of the shielding layer 5 is improved. The braiding angle of the cable axial included angle is that the braided angle of the inner braided layer 51 and the cable axial included angle is greater than 45 degrees, and the braided angle of the outer braided layer 52 and the cable axial included angle is less than 45 degrees (or inner braided layer 52). The braiding angle between the braiding layer 51 and the axial direction of the cable is less than 45 degrees, and the braiding angle between the outer braiding layer 52 and the axial direction of the cable is greater than 45 degrees).

In an optional embodiment, a set of densely woven parts and loosely woven parts is taken as an example.

As shown in FIG. 3 , the densely woven part and the loosely woven part in the inner braided belt 51 are marked as the first weaved part 511 and the second weaved part 512 in the figure, wherein the weaving density of the first weaved part 511 is 90%. -95%, the weaving density of the second weaving part 512 is 40%-60%.

As shown in FIG. 4 , the densely woven part and the sparsely woven part in the outer braided belt 52 are marked as the fourth weaving part 522 and the third weaving part 521 in the figure, wherein the weaving density of the third weaving part 521 is 40%- 60%, the weaving density of the fourth weaving part 522 is 90%-95%.

Wrapped shield

The wrapping method of the shielding layer 5 is as follows: wrap the inner braided layer 51 rightward to the outer wall of the inner lining layer 4, then wrap the outer braided layer 52 rightward around the outer wall of the inner braided layer 51, wrap At the same time, the densely woven parts and sparsely woven parts on the inner braided layer 51 and the outer braided layer 52 overlap each other, so that the densely woven parts of the two braided layers are densely and interlacedly distributed along the radial direction of the cable.

Specifically, after wrapping and covering, the third braided portion 521-the fourth braided portion 522 of the outer braided layer 52 are respectively covered on the first braided portion 511 and the second braided portion 512 of the inner braided layer 51, so that The part with dense weaving density of the outer braiding tape is superimposed on the part with sparse weaving density of the inner braiding tape, and the part with sparse weaving density of the outer braiding tape is superimposed on the part with dense weaving density of the inner braiding tape.

In another embodiment, if the densely woven part and the sparsely woven part are arranged in two or more groups, then the braided belt structure formed by alternately weaving the densely woven part and the sparsely woven part along the width direction of the braided belt is: densely woven part -Sparse weave-Dense weave-Sparse weave...and so on.

Braided overshield

In an optional embodiment, the inner braiding layer 51 and the outer braiding layer 52 of the shielding layer 5 can also be set as a braided sheathing structure. Cover the inner braiding layer 51, and then use a braiding machine to alternately weave and coat the outer braiding layer 52 along the axial direction of the cable. The inner braiding layer 51 and the outer braiding layer 52 are alternately dense and dense in the radial direction of the cable. distributed.

Specifically, the braided covering shielding layer 5 includes the following steps:

Step 1. Weaving the inner braiding layer 51: First, use a braiding machine to weave a densely woven part with a certain width along the axial direction of the cable, and then weave and connect the sparsely woven part along the weaving direction of the densely woven part. The braiding width of the braided part is the same, so that the dense braided part-thick braided part-dense braided part-sparse braided part is alternately braided along the axial direction (length direction) of the cable, until the cable is braided and coated with an inner braided layer 51;

Step 2. Weaving the outer braiding layer 52: the braiding method is the same as that of the inner braiding layer 51, and the braiding density is opposite. The braided part is then braided along the weaving direction of the sparsely woven part to connect the densely woven part. The weaving width of the densely woven part is the same as that of the sparsely woven part. In this way, the sparsely woven parts are alternately woven along the axial direction (length direction) of the cable- Dense weaving - sparse weaving - dense weaving until the cable is braided and covered with an outer braiding layer 52 .

Among them, the weaving density of the sparse weaving part is 40%-60%, the weaving density of the dense weaving part is 90%-95%, the braiding tape with a density of 90%-95% and the width of the braiding tape with a density of 40%-60% The same, so that the overlapping rate of the braided tape with sparse weaving density and the braided tape with dense weaving density reaches more than 98%.

Another embodiment of the shield

In another embodiment, the difference from the above-mentioned specific embodiment is that: the inner braiding layer 51 adopts a plurality of bare metal wires (copper wires or copper alloy wires, or wires obtained by plating them) The braided belt is braided in a crossed manner, and the outer braided layer 52 is braided in a crossed manner by using a plurality of copper foil wires and a plurality of bare metal wires (copper wires or copper alloy wires, or wires obtained by plating them). Braided tape, the ratio of copper foil wire to bare metal wire is 1:1.

Among them, the copper foil wire has good elasticity, softness and bending strength, and is softer than the bare metal wire. Therefore, the outer braiding layer 52 is a braid formed by cross-braiding the copper foil wire and the bare metal wire. The shielding tape made of cross braided bare metal wires is softer and has excellent bending resistance and torsion resistance. Because of its better softness, there is relatively less danger of wire hardening piercing the outer sheath 6 to produce wire protrusion.

Further, the outer sheath 6 is extruded on the outer wall of the outer braiding layer 52 by using polyvinyl chloride material. The polyvinyl chloride material has good flexibility, and is extruded on the outer wall of the shielding layer 5 as an outer sheath, so that the cable is cabled The softness of the back is better, and the PVC material also has the advantages of corrosion resistance and aging resistance, which can protect the cable.

[Preparation method of highly shielded flexible power cable]

The second aspect of the present invention proposes a method for preparing a highly shielded flexible power cable, comprising the following steps:

Step 1, preparing wire core 1, comprises the following steps:

1.1), preparing the conductor 11: twisting a plurality of pure oxygen-free copper ultra-fine copper wires in a normal way of 1+6+12 through a stranding machine to form a conductor unit with a circular cross section;

1.2) Preparation of the insulating layer 12: extruding the cross-linked polyethylene insulating material on the outer wall of the conductor unit with a thickness of 0.2mm-0.5mm through an extrusion machine to complete the preparation of the insulating core.

Step 2, preparing filling rope 2: using TPR/SBS/TPE elastomer material to extrude into filling rope 2 with a circular section through a tube extruder;

Step 3. Prepare the cable core: Arrange multiple wire cores 1 two by two tangentially, and twist each other through a twisting machine to form a twisted structure, fill the gaps in the twisted structure with a filling rope 2 with a circular cross section, and finally The outer wall of the filling rope 2 is wrapped with a non-woven fabric tape in the right direction, and the cable core is fixed to form a circular cross section;

Step 4, preparing the inner lining layer 4: using polyethylene material to be extruded on the outer wall of the cable core through an extruder to form the inner lining layer 4, and the extruded thickness is 0.15mm-0.30mm;

Step 5, preparing shielding layer 5, comprises the following steps:

5.1), preparation of the inner braided layer 51: using bare metal wires to weave a densely woven belt with a certain width and a density of 90%-95% along the length direction of the braided belt in a cross-braided manner, on one side of the densely woven belt In its length direction, metal bare wires are used to weave and connect sparse braided belts with a braiding density of 40%-60% in a cross-braided manner to form an inner braided layer 51;

5.2), preparing the outer braided layer 52: use bare metal wires to weave a certain width of sparse braided tape with a density of 40%-60% along the length direction of the braided tape in a cross braided manner, In its length direction, metal bare wires are used to weave and connect densely woven belts with a weaving density of 90%-95% in a cross-braiding manner to form an outer braided layer 52;

5.3), wrapping the shielding layer 5: first wrap the inner braided layer 51 formed by weaving in the above step 5.1 to the outer wall of the inner lining layer 4 in the right direction, and then wrap the outer braided layer 52 formed in the above step 5.2 to the right Wrapping the outer wall of the inner braided layer 51, the inner braided layer 51 and the outer braided layer 52 overlap each other with dense braided parts;

Step 6, preparing the outer sheath 6: extruding and wrapping the outer wall of the shielding layer 5 with polyvinyl chloride material, and the extruded thickness is 0.8mm-1.5mm.

The highly shielded flexible power cable proposed by the invention complies with the national standard JB/T8734.5-2012. As described in the above embodiment of the shielding layer 5, the coverage density of the shielding layer 5 meets the national standard requirement of greater than 90%, and the preparation method is simple, which not only reduces the use of bare metal wires, but also reduces the cost of cable preparation. At the same time, the weight of the cable is also reduced to meet the high shielding performance, while making the cable more flexible and easy to bend and lay.

In addition, the test results of the cable shown in the present invention are shown in FIG. 5 , and both the electrical performance and the bending performance are qualified, meeting the requirements for use.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (15)

1. A highly shielded flexible power cable, characterized in that it comprises: The wire core (1), a plurality of wire cores (1) are tangent to each other and twisted with each other; A filling rope (2), which is filled in the stranding gaps of the plurality of wire cores (1); A wrapping tape (3), wrapped around the outer wall of the filling rope (2), so that the core (1) and the filling rope (2) are wound together by the wrapping tape (3) into a section a circular cable core; The inner liner (4) is extruded on the outer wall of the wrapping belt (3); A shielding layer (5), coated on the outer wall of the inner lining layer (4); An outer sheath (6), extruded on the outer wall of the shielding layer (5); Wherein, the shielding layer (5) includes an inner braiding layer (51) and an outer braiding layer (52), and the inner braiding layer (51) is wrapped on the outer wall of the inner lining layer (4), the The outer braided layer (52) is coated on the outer wall of the inner braided layer (51); Both the inner braiding layer (51) and the outer braiding layer (52) include first braiding parts and second braiding parts alternately distributed along the axial direction of the cable core, and the braiding density of the first braiding parts is greater than the The braiding density of the second braided portion is that the first braided portion and the second braided portion are alternately distributed along the radial direction of the cable core. 2. The highly shielded flexible power cable according to claim 1, characterized in that, the inner braiding layer (51) includes first braiding parts (511) and second braiding parts distributed alternately along the axial direction of the cable core (512), the braiding density of the first braiding part (511) is greater than the braiding density of the second braiding part (512), and the outer braiding layer (52) includes third braiding layers alternately distributed along the axial direction of the cable core. For the weaving part (521) and the fourth weaving part (522), the weaving density of the third weaving part (521) is smaller than the weaving density of the fourth weaving part (522). 3. The highly shielded flexible power cable according to claim 2, characterized in that, the weaving density of the first weaving part (511) and the fourth weaving part (522) are the same, and the weaving density is controlled at 90%- 95%; The weaving density of the second weaving part (512) is the same as that of the third weaving part (521), and the weaving density is controlled at 40%-60%. 4. The highly shielded flexible power cable according to claim 1, characterized in that, both the inner braiding layer (51) and the outer braiding layer (52) are composed of a plurality of bare metal wires braided in a cross manner. into a braided belt. 5. The highly shielded flexible power cable according to claim 1, characterized in that, the outer braiding layer (52) comprises a braided strip braided by a plurality of bare metal wires and copper foil wires in a crossing manner. 6. The highly shielded flexible power cable according to claim 4 or 5, characterized in that the axial angle between the braided wire of the inner braided layer (51) and the cable is greater than or less than 45 degrees; The axial angle between the braided wire of the outer braided layer (52) and the cable is less than or greater than 45 degrees, and the direction of the two angles is opposite. 7. The highly shielded flexible power cable according to claim 1, characterized in that the core (1) comprises a conductor (11), and an outer wall of the conductor (11) is extruded with an insulating layer (12). 8. The highly shielded flexible power cable according to claim 1, characterized in that, the filling rope (2) comprises a TPR/SBS/TPE elastomer with a circular cross section. 9. The highly shielded flexible power cable according to claim 1, characterized in that, the inner liner (4) comprises an extruded polyethylene inner sheath with a thickness of 0.1mm-0.3mm. 10. The highly shielded flexible power cable according to claim 1, characterized in that, the outer sheath (6) comprises an extruded polyvinyl chloride outer sheath, and the extruded thickness is 1.5mm-2.6mm. 11. The highly shielded flexible power cable and its preparation method according to any one of claims 1-10, characterized in that it comprises the following steps: Step 1, preparing the wire core (1), comprises the following steps: 1.1), preparing the conductor (11): a plurality of pure oxygen-free copper ultra-fine copper wires are stranded in a regular manner of 1+6+12 by a stranding machine to form a conductor unit with a circular cross section; 1.2), preparing the insulating layer (12): extruding the cross-linked polyethylene insulating material on the outer wall of the conductor unit through an extrusion machine, the extruded thickness is 0.2mm-0.5mm, and completing the preparation of the insulating core; Step 2, preparing the filling rope (2): using TPR/SBS/TPE elastomer material to extrude the filling rope (2) with a circular cross-section through a tube extruder; Step 3. Prepare the cable core: Arrange multiple wire cores (1) tangentially in pairs, and twist each other through a twisting machine to form a twisted structure, and fill the gaps of the twisted structure with circular cross-sections. The filling rope (2), finally adopts non-woven fabric tape to wrap rightward on the outer wall of the filling rope (2), and the cable core is solidly formed into a circular cross-section; Step 4, preparing the inner lining layer (4): extruding polyethylene material on the outer wall of the cable core through an extruder to form the inner lining layer (4), and the extruded thickness is 0.15mm-0.30mm; Step 5, preparing shielding layer (5), comprises the following steps: 5.1), prepare the inner braided layer (51): adopt the bare metal wire to weave a densely woven belt with a density of 90%-95% along the length direction of the braided belt in a cross-braided manner, The side is braided with bare metal wires along its length direction to form the inner braided layer (51); 5.2), prepare the outer braided layer (52): adopt the bare metal wire to weave a certain width along the length direction of the braided tape in a cross braided manner and be a sparse braided tape with a density of 40%-60%. The side adopts bare metal wires to weave densely braided belts with a braiding density of 90%-95% in a cross braided manner along its length direction to form the outer braided layer (52); 5.3), wrapping the shielding layer (5): first wrap the inner braided layer (51) formed by weaving in the above step 5.1 in the right direction to the outer wall of the inner lining layer (4), and then wrap the above step 5.2 The outer braided layer (52) formed by middle weaving is right-wrapped on the outer wall of the inner braided layer (51), and the inner braided layer (51) and the outer braided layer (52) are The dense and dense weaving parts overlap each other; Step 6. Prepare the outer sheath (6): Extrude and wrap the outer wall of the shielding layer (5) with polyvinyl chloride material, and the extruded thickness is 0.8mm-1.5mm. 12. The highly shielded flexible power cable and its preparation method according to claim 11, wherein the bare metal wire comprises any one of copper wire, copper alloy wire, tinned copper wire or tinned copper alloy wire kind. 13. The highly shielded flexible power cable and its preparation method according to claim 11, characterized in that, the braiding angle between the inner braiding layer (51) and the axial direction of the cable is greater than 45 degrees, and the outer layer The braiding angle between the braiding layer (52) and the axial direction of the cable is less than 45 degrees; the directions of the two angles are opposite. 14. The highly shielded flexible power cable and its preparation method according to claim 11, characterized in that, the braiding angle between the inner braiding layer (51) and the axial direction of the cable is less than 45 degrees, and the outer layer The braiding angle between the braiding layer (52) and the axial direction of the cable is greater than 45 degrees, and the directions of the two angles are opposite. 15. The highly shielded flexible power cable and its preparation method according to any one of claims 11-14, characterized in that, the inner braided layer (51) and the outer braided layer (52) The weaving width of the densely woven part is the same as that of the sparsely woven part.

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