High-bending and torsional life composite drag chain cables and their communication core stranding process

Abstract

This invention discloses a composite drag chain cable with high bending and torsional life and its communication core stranding process. The composite drag chain cable includes a main cable core and, sequentially arranged from the inside out, a non-woven fabric layer, a TPE elastomer inner sheath, a tinned copper braided shielding layer, and a TPU elastomer outer sheath on the outside of the main cable core. The main cable core is composed of communication cores, power cores, and several nylon filler cores stranded together. The communication cores include three-core and two-core communication cores. The stranding direction of the three-core communication cores is the same as the wrapping direction and the same as the stranding direction of the main cable core. The stranding and wrapping directions of the two-core communication cores are the same as those of the three-core communication cores. This invention significantly improves the torsional resistance of the composite drag chain cable during operation, making it suitable for drag chain + torsion applications and extending its service life.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a composite drag chain cable with high bending and torsional life and its communication core stranding process. Background Technology

[0002] Conventional drag chain cables are mostly multi-core control and power cables, using high-strength, high-quality plastics to withstand repeated bending within the drag chain, typically designed for a lifespan of 5 million cycles or more. However, composite drag chain cables usually include one or more communication cable groups. When communication cable groups are included in the cable structure, its lifespan is significantly reduced, generally falling below 1 million cycles. This is manifested by damage to the communication cable group structure, insulation failure leading to short circuits, and conductor breakage.

[0003] Currently, composite drag chain cables lack special linkage designs for conductor stranding direction and pitch ratio, stranding direction and pitch ratio, and wrapping direction. Relying solely on the mechanical strength of insulation and sheathing materials is no longer sufficient to meet the lifespan requirements of composite drag chain cables.

[0004] In some cases, in addition to moving with the cable chain, a composite cable may also have its lead wires twisting. Conventional composite cables cannot meet the requirements for twisting. Usually, after tens of thousands of twists, the communication cable assembly will be damaged, forcing the user to install the communication cable assembly as a separate cable, which severely limits the laying space, affects the neatness of the wiring, and increases the equipment cost. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a composite drag chain cable with high bending and torsional life and its communication core stranding process, which greatly improves the anti-torsion performance of the composite drag chain cable during operation, is suitable for drag chain + torsion application scenarios, and extends service life.

[0006] The present invention provides a composite drag chain cable with high bending and torsional life, comprising a main cable core and, from the inside out, a non-woven fabric layer, a TPE elastomer inner sheath, a tinned copper braided shielding layer, and a TPU elastomer outer sheath disposed on the outer side of the main cable core.

[0007] The main cable core is composed of communication cores, power cores, and several nylon filler cores twisted together; the communication cores include three-core communication cores and two-core communication cores; one three-core communication core and one two-core communication core are distributed on any cross-section of the main cable core, and the nylon filler cores are arranged between the three-core communication cores and the two-core communication cores; four power cores are arranged symmetrically in pairs on both sides between the three-core communication cores and the two-core communication cores; the nylon filler cores are arranged on the outer sides of adjacent three-core communication cores and power cores, on the outer sides of adjacent power cores, and on the outer sides of adjacent two-core communication cores and power cores.

[0008] The twisting direction of the three-core communication wire is the same as the wrapping direction, and it is also the same as the twisting direction of the main cable core. The twisting direction and wrapping direction of the two-core communication wire are the same as those of the three-core communication wire.

[0009] Furthermore, the pitch ratio of the main cable core stranding is 9-10, and the stranding direction is either S-direction or Z-direction.

[0010] Furthermore, the three-core communication wire core includes three stranded communication insulated wires, and the outer sides of the three communication insulated wires are wrapped with a first polytetrafluoroethylene film layer. A drain wire is provided on the outer side of the first polytetrafluoroethylene film layer. From the inside out, a polyester / aluminum composite film layer, a tin-plated copper winding shielding layer, and a second polytetrafluoroethylene film layer are provided on the outer sides of the first polytetrafluoroethylene film layer and the drain wire.

[0011] The communication insulated wire includes a communication wire conductor and a communication wire insulation layer disposed on the outside of the communication wire conductor. The communication wire insulation layer is coated with talc powder. The communication wire conductor is made of several 0.08mm copper wires twisted together with a twisting pitch ratio of 15-18, and the twisting direction is the same as that of the main cable core. The communication wire insulation layer is made of TPE elastomer material. The three communication insulated wires are twisted together with a pitch ratio of 10-11, and their twisting direction is the same as that of the main cable core.

[0012] Furthermore, the first polytetrafluoroethylene film layer is wound longitudinally around the three communication insulating wires, and the pitch of the longitudinal wrap is the same as the pitch of the twisting of the three communication insulating wires, and the direction is the same.

[0013] The drain wire is rotated and embedded into the gap outside any two of the three communication insulating wires along the twisting direction, and its pitch is the same as the twisting pitch of the three communication insulating wires and the same direction.

[0014] The polyester / aluminum composite film layer is wound longitudinally around the first polytetrafluoroethylene film layer and the drain line. The pitch of the longitudinal wrapping is the same as the pitch of the three communication insulating wires twisted together, and the direction is the same.

[0015] Furthermore, the structural difference between the two-core and three-core communication wires lies only in the number of communication insulation wires; the two-core communication wires are provided with two of the communication insulation wires.

[0016] Furthermore, the power wire core includes a power wire conductor and a power wire insulation layer disposed on the outside of the power wire conductor, and the power wire insulation layer is coated with talc powder.

[0017] In addition, the present invention also provides a cable stranding process for the communication core of the composite drag chain cable with high bending and torsional life as described above, wherein the cable stranding process is performed by a cable stranding device to complete the cable stranding of the communication core of the composite drag chain cable.

[0018] The cable stranding device includes a first active untwisting and releasing frame, a wire distributor, a first mold, a second mold, a third mold, and a single stranding machine arranged sequentially along the processing direction; a first wrapping frame is provided on one side of the first mold, a second active untwisting and releasing frame is provided on one side of the second mold, and a second wrapping frame is provided on one side of the third mold.

[0019] Furthermore, the communication core stranding process includes the following steps:

[0020] 1) Two or three sets of first active untwisting wire feeding frames lead out communication insulated wires respectively. Each communication insulated wire passes through the wire distribution plate, the first mold, the second mold and the third mold in sequence and is then connected to the single twisting machine.

[0021] 2) After passing the polytetrafluoroethylene film on the first package frame through the first mold, it is wrapped around the outside of each communication insulation wire to form the first polytetrafluoroethylene film layer;

[0022] 3) The second active untwisting wire release frame leads out the drain line. The drain line passes through the second mold and the third mold in sequence and is connected to the single twisting machine. After passing through the second mold, the drain line is placed outside the first polytetrafluoroethylene film layer and rotates along the twisting direction to be embedded in the gap outside any two communication insulation wires.

[0023] 4) After passing the polyester / aluminum composite film on the second packing frame through the third mold, wrap it around the first polytetrafluoroethylene film layer and the drain line to form a polyester / aluminum composite film layer.

[0024] 5) Start the twisting machine to continuously twist the communication wire cores.

[0025] Furthermore, in step 1), when twisting the two-core communication wires, two sets of the first active untwisting and releasing frame are set up, and two symmetrically distributed wire core holes are opened on the wire distribution plate.

[0026] Furthermore, in step 1), when twisting the three-core communication wires, three sets of the first active untwisting and releasing frame are set up, and three wire core holes distributed in an equilateral triangle are opened on the wire distribution plate.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) The drag chain cable of the present invention has optimized the structural layout. Instead of placing an insulated core at the center, a nylon filler core is placed at the center, and nylon filler cores are also placed in the outermost gap of the main cable core. Since the nylon filler core at the center does not participate in the stranding, the length of the nylon filler core per unit cable length is less than any insulated core and stranding structure, making it the stress center of the entire cable, bearing most of the stress when the cable is bent, and protecting other structures; the outermost nylon filler core strengthens the overall tensile strength limit of the cable and participates in the stress during the torsional movement of the cable, significantly improving the torsional life of the cable;

[0029] (2) The drag chain cable of the present invention has a flexible stranding design for the three-core and two-core communication cores. The stranding direction of the communication conductor is consistent with that of the first polytetrafluoroethylene film layer, the drain line, and the polyester / aluminum composite film layer. This design is significantly better than the conventional adjacent structure S / Z reverse design when applied to drag chain cables. The same stranding direction ensures that the stress accumulation and release of each structure is consistent in direction and timing during bending and torsion of the drag chain cable, and can be coordinated and synchronized. No single structure bears a large stress. Instead, the communication core accumulates and releases stress as a whole, which greatly extends the bending and torsion life of the cable.

[0030] (3) The drag chain cable of the present invention has an optimized stranding pitch ratio design. The stranding pitch ratio of conventional cables is generally 20-30 for conductors and 15-20 for insulated cores. Within a reasonable range, the smaller the pitch ratio, the more flexible the cable is, and the more conducive it is to bending and twisting. The stranding pitch ratio of the communication line conductor in this application is 15-18, the stranding pitch ratio of the communication core is 10-11, and the stranding pitch ratio of the main cable core is 9-10. While reducing the pitch ratio, a design is adopted in which the pitch ratio gradually decreases from the inside to the outside, making the overall cable stranding compact and improving the structural stability during bending and twisting;

[0031] (4) The drag chain cable of the present invention rotates and embeds the drain line into the gap outside the communication insulation line along the stranding direction. This avoids the drain line becoming the unit with the greatest force when the cable is bent, and at the same time avoids the drain line squeezing the communication insulation line, and is not easy to damage the polytetrafluoroethylene film and insulation layer.

[0032] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0033] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0034] Figure 1 This is a schematic diagram of the cross-sectional structure of a composite drag chain cable;

[0035] Figure 2 This is a schematic diagram of the cross-sectional structure of a three-core communication cable.

[0036] Figure 3 This is a schematic diagram of the cross-sectional structure of a two-core communication cable.

[0037] Figure 4 This is a schematic diagram of the components of a cable stranding device.

[0038] The diagram labels are as follows: 1. Communication core; 2. Power core; 3. Nylon filler core; 4. Non-woven fabric layer; 5. TPE elastomer inner sheath; 6. Tinned copper braided shield; 7. TPU elastomer outer sheath; 8. Cable twisting device.

[0039] 11. Three-core communication wire; 12. Two-core communication wire;

[0040] 111. Communication line conductor; 112. Communication line insulation layer; 113. First polytetrafluoroethylene film layer; 114. Drain wire; 115. Polyester / aluminum composite film layer; 116. Tinned copper wound shielding layer; 117. Second polytetrafluoroethylene film layer;

[0041] 21. Power line conductor; 22. Power line insulation layer;

[0042] 81. First active untwisting and pay-off frame; 82. Splitting reel; 83. First mold; 84. Second mold; 85. Third mold; 86. Single twister; 87. First tape wrapping frame; 88. Second active untwisting and pay-off frame; 89. Second tape wrapping frame. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] Please refer to Figures 1-3 The present invention provides a composite drag chain cable with high bending and torsional life, including a main cable core and a non-woven fabric layer 4, a TPE elastomer inner sheath 5, a tin-plated copper braided shielding layer 6 and a TPU elastomer outer sheath 7 arranged sequentially from the inside to the outside of the main cable core.

[0046] The main cable core is composed of a communication core 1, a power core 2, and several nylon filler cores 3 twisted together; the communication core 1 includes a three-core communication core 11 and a two-core communication core 12; one three-core communication core 11 and one two-core communication core 12 are distributed on any cross section of the main cable core, and nylon filler cores 3 are arranged between the three-core communication core 11 and the two-core communication core 12; four power cores 2 are arranged symmetrically on both sides between the three-core communication core 11 and the two-core communication core 12; nylon filler cores 3 are arranged on the outer side between adjacent three-core communication cores 11 and power cores 2, on the outer side between adjacent power cores 2, and on the outer side between adjacent two-core communication cores 12 and power cores 2;

[0047] Among them, the twisting direction of the three-core communication core 11 is the same as the wrapping direction, and the same as the twisting direction of the main cable core. The twisting direction and wrapping direction of the two-core communication core 12 are the same as those of the three-core communication core 11.

[0048] In this embodiment, by optimizing the structure of the drag chain cable, the twisting direction from the inside out is consistent with the wrapping direction. This ensures that the stress accumulation and release of each structure is in the same direction and at the same time during bending and torsion, enabling coordinated synchronization. No single structure bears a large stress; instead, the communication core as a whole accumulates and releases stress, greatly extending the cable's bending and torsion life.

[0049] A nylon core 3 is placed at the center, and nylon core 3 is also placed in the outermost gap of the main cable core. The nylon core 3 at the center becomes the stress center of the entire cable, bearing most of the stress when the cable bends and protecting other structures; the outermost nylon core 3 strengthens the overall tensile strength limit of the cable and participates in the stress during cable torsional motion, significantly improving the torsional life of the cable; preferably, the nylon core 3 is made of braided nylon rope, which has a strength increase of more than 40% compared to ordinary nylon rope.

[0050] In a preferred embodiment, the pitch ratio of the main cable core stranding is 9-10, and the stranding direction is S-direction or Z-direction, ensuring the flexibility of the drag chain cable.

[0051] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, the three-core communication core 11 includes three twisted communication insulated wires. The outer sides of the three communication insulated wires are wrapped with a first polytetrafluoroethylene film layer 113. A drain wire 114 is provided on the outer side of the first polytetrafluoroethylene film layer 113. From the inside out, a polyester / aluminum composite film layer 115, a tin-plated copper wound shielding layer 116, and a second polytetrafluoroethylene film layer 117 are provided on the outer sides of the first polytetrafluoroethylene film layer 113 and the drain wire 114.

[0052] The communication insulated wire includes a communication conductor 111 and a communication insulation layer 112 disposed outside the communication conductor 111. The communication insulation layer 112 is coated with talc powder. The communication conductor 111 is made of several 0.08mm copper wires twisted together with a twist pitch ratio of 15-18, and the twisting direction is the same as that of the main cable core. The communication insulation layer 112 is made of TPE elastomer material. The three communication insulated wires are twisted together with a pitch ratio of 10-11, and their twisting direction is the same as that of the main cable core.

[0053] In this embodiment, 0.08mm ultrafine copper wire is used as the conductor monofilament, which greatly improves the flexibility of the communication line conductor 111 and gives it a longer bending life; the surface of the communication line insulation layer 112 is coated with talc powder to reduce frictional damage between adjacent structures and improve the service life of the cable.

[0054] The stranding direction of the communication line conductor, the first polytetrafluoroethylene film layer 113, the drain line 114, and the polyester / aluminum composite film layer 115 are all consistent, which makes the stress accumulation and release of each structure consistent, greatly extending the bending and torsional life of the cable.

[0055] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, the first polytetrafluoroethylene film layer 113 is wound around the three communication insulation wires in a longitudinal wrapping form, and the pitch of the longitudinal wrapping is the same as the pitch of the three communication insulation wires twisted together, and the direction is the same.

[0056] The drain wire 114 is rotated and embedded into the gap outside any two communication insulation wires along the twisting direction of the three communication insulation wires. Its pitch is the same as the twisting pitch of the three communication insulation wires and the same direction.

[0057] The polyester / aluminum composite film layer 115 is wound longitudinally around the first polytetrafluoroethylene film layer 113 and the drain line 114. The pitch of the longitudinal wrapping is the same as the pitch of the three communication insulating wires twisted together, and the direction is the same.

[0058] In a preferred embodiment, such as Figure 2 and Figure 3As shown, the structural difference between the two-core communication core 12 and the three-core communication core 11 lies only in the number of communication insulation wires. The two-core communication core has two communication insulation wires.

[0059] In a preferred embodiment, such as Figure 1 As shown, the power core 2 includes a power conductor 21 and a power insulation layer 22 disposed on the outside of the power conductor 21. The power insulation layer 22 is coated with talc powder to reduce frictional damage between adjacent structures and improve the service life of the cable.

[0060] Also, please refer to Figure 4 The embodiments of the present invention also provide a communication core stranding process for a composite drag chain cable with high bending and torsional life as described above. The stranding process uses a stranding device 8 to complete the stranding of the communication core of the composite drag chain cable.

[0061] The cable stranding device 8 includes a first active untwisting and unwinding frame 81, a wire splitter 82, a first mold 83, a second mold 84, a third mold 85, and a single stranding machine 86 arranged sequentially along the processing direction; a first wrapping frame 87 is provided on one side of the first mold 83, a second active untwisting and unwinding frame 88 is provided on one side of the second mold 84, and a second wrapping frame 89 is provided on one side of the third mold 85.

[0062] The process of stranding communication cores includes the following steps:

[0063] 1) Two or three sets of first active untwisting wire release frames 81 respectively lead out communication insulated wires, and each communication insulated wire passes through the wire distribution plate 82, the first mold 83, the second mold 84 and the third mold 85 in sequence and is connected to the single twister 86.

[0064] 2) After passing the polytetrafluoroethylene film on the first packaging frame 87 through the first mold 83, it is wrapped around the outside of each communication insulation wire to form the first polytetrafluoroethylene film layer 113.

[0065] 3) The second active untwisting cable tray 88 leads out the drain line 114. The drain line 114 passes through the second mold 84 and the third mold 85 in sequence and is connected to the single twister 86. After passing through the second mold 84, the drain line 114 is placed outside the first polytetrafluoroethylene film layer 113 and rotates along the twisting direction to be embedded in the gap outside any two communication insulation wires.

[0066] 4) After passing the polyester / aluminum composite film on the second packaging frame 89 through the third mold 85, it is wrapped around the first polytetrafluoroethylene film layer 113 and the drainage line 114 to form a polyester / aluminum composite film layer 115.

[0067] 5) Start the single twisting machine 86 to continuously twist the communication wire cores.

[0068] When twisting two communication cores 12 into a cable, the first active untwisting cable release frame 81 is set with 2 sets, and two symmetrically distributed core holes are opened on the cable distribution plate 82.

[0069] When twisting the three-core communication wire 11, the first active untwisting wire release frame 81 is set with 3 sets, and the wire distribution plate 82 has three wire core holes distributed in an equilateral triangle.

[0070] In this embodiment, the cable stranding device 8 can achieve the stranding of two-core and three-core communication wires by changing the branching reel 82, the first mold 83, the second mold 84 and the third mold 85 of different specifications. The processing of two-core or three-core stranded cable, longitudinal wrapping of polytetrafluoroethylene film, rotary embedded drainage line and longitudinal wrapping of polyester / aluminum composite film can be completed on one machine at a time. The processing efficiency is high and the production quality of the cable is ensured.

[0071] The first mold 83 and the third mold 85 of the cable stranding device have similar structures, except for their inner diameters. Both are trumpet-shaped, and their inner diameters decrease linearly along the processing direction. They are used to constrain the position of the wrapping tape and control the shape change and pitch of the wrapping tape during the longitudinal wrapping process, so that it is the same as the pitch of the stranded cable.

[0072] The second mold 84 has a wire-passing hole. The inner diameter of the wire-passing hole is only large enough to allow the drain wire 114 to pass through the gap between the two communication insulation wires, so as to ensure that the stranded cable forming meets the design requirements.

[0073] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0074] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A composite drag chain cable with high bending and torsional life, characterized in that, It includes the main cable core and, from the inside out, the non-woven fabric layer (4), the TPE elastic inner sheath (5), the tin-plated copper braided shielding layer (6) and the TPU elastic outer sheath (7) arranged sequentially on the outside of the main cable core; The main cable core is formed by twisting together a communication core (1), a power core (2), and several nylon filler cores (3); the communication core (1) includes a three-core communication core (11) and a two-core communication core (12); one three-core communication core (11) and one two-core communication core (12) are distributed on any cross section of the main cable core, and the nylon filler core (3) is arranged between the three-core communication core (11) and the two-core communication core (12), and four symmetrical power cores (2) are arranged on both sides between the three-core communication core (11) and the two-core communication core (12), and the nylon filler core (3) is arranged on the outer side between adjacent three-core communication cores (11) and power cores (2), the outer side between adjacent power cores (2), and the outer side between adjacent two-core communication cores (12) and power cores (2); The twisting direction of the three-core communication core (11) is the same as the wrapping direction. The twisting direction and wrapping direction of the two-core communication core (12) are the same as those of the three-core communication core (11). The twisting direction and wrapping direction of the three-core communication core (11) and the two-core communication core (12) are the same as those of the main cable core.

2. The composite drag chain cable with high bending and torsional life according to claim 1, characterized in that, The main cable core is stranded with a pitch ratio of 9-10, and the stranding direction is either S-direction or Z-direction.

3. The composite drag chain cable with high bending and torsional life according to claim 1, characterized in that, The three-core communication core (11) includes three stranded communication insulated wires. The outer sides of the three communication insulated wires are wrapped with a first polytetrafluoroethylene film layer (113). A drain wire (114) is provided on the outer side of the first polytetrafluoroethylene film layer (113). The outer sides of the first polytetrafluoroethylene film layer (113) and the drain wire (114) are provided with a polyester / aluminum composite film layer (115), a tin-plated copper winding shielding layer (116), and a second polytetrafluoroethylene film layer (117) in sequence from the inside to the outside. The communication insulated wire includes a communication wire conductor (111) and a communication wire insulation layer (112) disposed outside the communication wire conductor (111). The communication wire insulation layer (112) is coated with talc powder. The communication wire conductor (111) is made of several 0.08mm copper wires twisted together with a twisting pitch ratio of 15-18. The twisting direction is the same as that of the main cable core. The communication wire insulation layer (112) is made of TPE elastomer material. The three communication insulated wires are twisted together with a pitch ratio of 10-11. Their twisting direction is the same as that of the main cable core.

4. The composite drag chain cable with high bending and torsional life according to claim 3, characterized in that, The first polytetrafluoroethylene film layer (113) is wound around the three communication insulating wires in a longitudinal wrapping form, and the pitch of the longitudinal wrapping is the same as the pitch of the three communication insulating wires twisted together, and the direction is the same. The drain wire (114) is rotated and embedded into the gap outside any two of the three communication insulating wires along the twisting direction of the three communication insulating wires, and its pitch is the same as the twisting pitch of the three communication insulating wires and the same direction. The polyester / aluminum composite film layer (115) is wound longitudinally around the first polytetrafluoroethylene film layer (113) and the drain line (114), and the pitch of its longitudinal wrapping is the same as the pitch of the three communication insulating wires twisted together, and the direction is the same.

5. The composite drag chain cable with high bending and torsional life according to claim 4, characterized in that, The structural difference between the two-core communication core (12) and the three-core communication core (11) lies only in the number of the communication insulation wires. The two-core communication core (12) is provided with two of the communication insulation wires.

6. The composite drag chain cable with high bending and torsional life according to claim 1, characterized in that, The power core (2) includes a power conductor (21) and a power insulation layer (22) disposed on the outside of the power conductor (21), the power insulation layer (22) being coated with talc powder.

7. A communication core stranding process for a composite drag chain cable with high bending and torsional life as described in any one of claims 1-6, characterized in that, The stranding process uses a stranding device (8) to strand the communication core of the composite drag chain cable. The cable stranding device (8) includes a first active untwisting and unwinding frame (81), a wire divider (82), a first mold (83), a second mold (84), a third mold (85), and a single stranding machine (86) arranged sequentially along the processing direction; a first wrapping frame (87) is provided on one side of the first mold (83), a second active untwisting and unwinding frame (88) is provided on one side of the second mold (84), and a second wrapping frame (89) is provided on one side of the third mold (85).

8. The communication core stranding cable process according to claim 7, characterized in that, Includes the following steps: 1) Two or three sets of first active untwisting wire feeding frames (81) respectively lead out communication insulated wires, and each communication insulated wire passes through the wire distribution plate (82), the first mold (83), the second mold (84) and the third mold (85) in sequence and is connected to the single twister (86); 2) After passing the polytetrafluoroethylene film on the first packaging frame (87) through the first mold (83), it is wrapped around the outside of each communication insulation wire to form the first polytetrafluoroethylene film layer (113); 3) The second active untwisting wire release frame (88) leads out the drain line (114). The drain line (114) passes through the second mold (84) and the third mold (85) in sequence and is connected to the single twister (86). After passing through the second mold (84), the drain line (114) is placed outside the first polytetrafluoroethylene film layer (113) and rotates along the twisting direction to embed into the gap outside any two communication insulation wires. 4) After passing the polyester / aluminum composite film on the second packing frame (89) through the third mold (85), wrap it around the first polytetrafluoroethylene film layer (113) and the drainage line (114) to form a polyester / aluminum composite film layer (115). 5) Start the single twister (86) to continuously twist the communication core.

9. The communication core stranding cable process according to claim 8, characterized in that, In step 1), when twisting the two communication cores (12) into a cable, two sets of the first active untwisting cable release frame (81) are set up, and two symmetrically distributed core holes are opened on the cable distribution plate (82).

10. The communication core stranding cable process according to claim 8, characterized in that, In step 1), when twisting the three-core communication wire core (11), the first active untwisting wire release frame (81) is set in 3 sets, and three wire core holes distributed in an equilateral triangle are opened on the wire distribution plate (82).

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