A flexible abrasion resistant cable resistant to repeated pulling
The cable, with its multi-layer structure and self-locking sliding limit design, solves the problem of traditional cables being prone to breakage under repeated bending, stretching and torsion, achieving high flexibility and wear resistance, and extending its service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 贵州安众成电线电缆有限公司
- Filing Date
- 2026-06-02
- Publication Date
- 2026-07-24
AI Technical Summary
Traditional cables are prone to problems such as conductor breakage, insulation damage, and sheath bulging under repeated bending, stretching, and torsion conditions. Moreover, existing tensile and bending cables have complex structures, high costs, and insufficient flexibility.
The cable employs a multi-layered structure design consisting of a central elastomer, an anti-torsion inner sheath, an anti-tensile braided layer, and an outer sheath. Combined with the cooperation of spiral conductor grooves, spiral strips, and raised grooves, it forms a self-locking, sliding, and limiting structure, enhancing the cable's flexibility and abrasion resistance.
Under repeated bending, stretching and torsion conditions, it significantly improves the service life of the cable, reduces the wear rate, maintains good flexibility and wear resistance, and avoids fatigue fracture of the conductor.
Smart Images
Figure CN122455447A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of cable technology, specifically relating to a wear-resistant flexible cable that is suitable for applications such as robots, cable chain systems, and power tools that require repeated bending, stretching, and torsion. Background Technology
[0002] In applications such as robot joints, automated equipment cable chains, and power tools, cables need to withstand repeated bending, stretching, and torsion. Traditional cables are prone to the following problems during long-term use: Repeated bending and stretching cause alternating stress on the copper wires, exceeding their fatigue limit and leading to breakage and open circuits. Direct contact between the conductor and the outer sheath causes intermittent collisions and relative sliding during repeated bending. The hard material on the inner wall of the outer sheath generates localized impacts and scratches on the conductor insulation surface, leading to insulation damage and short circuits. After prolonged bending, the radial expansion force generated by the displacement of the internal conductors acts on the inner wall of the sheath, causing a "birdcage effect" (bulging and cracking). Under torsion conditions, the lack of circumferential restraint between the internal layers of the cable leads to conductor kinking, displacement, or breakage.
[0003] While there are some tensile and bending resistant cable solutions in the existing technology, they generally suffer from complex structures, high costs, and insufficient flexibility. Summary of the Invention
[0004] To address the aforementioned problems, the present invention aims to provide a wear-resistant flexible cable that is resistant to repeated stretching, which has a long service life under repeated bending, stretching and torsion conditions, while maintaining excellent flexibility and wear resistance.
[0005] The objective of this invention is achieved through the following technical solution: A wear-resistant flexible cable resistant to repeated pulling includes a central elastomer, an anti-torsion inner sheath, an anti-tension braided layer, and an outer sheath. The central elastomer is made of an elastic material, and its outer surface has multiple helical conductor grooves and multiple helical mounting grooves, which are arranged alternately and parallel to each other. A conductor is embedded in each helical conductor groove. A helical strip is embedded in each helical mounting groove, and the two sides of the helical strip extend to both sides, respectively pressing down at least a portion of two adjacent conductors. The anti-torsion inner sheath covers the helical strip. The anti-tension braided layer covers the anti-torsion inner sheath. The outer sheath covers the anti-tension braided layer.
[0006] Furthermore, the cross-section of the spiral strip is "T"-shaped or "Y"-shaped, and the length of its two side extensions is greater than the distance between adjacent spiral guide grooves; the two side walls of the spiral strip are provided with locking protrusions, and the side walls of the spiral guide grooves are provided with micro-grooves, and the locking protrusions and the micro-grooves form a self-locking fit.
[0007] Furthermore, a spiral groove is provided on the back of each spiral strip along its length; a spiral protrusion corresponding to each spiral strip is provided on the inner surface of the anti-torsion inner sheath, and the spiral protrusion is embedded in the spiral groove on the back of the corresponding spiral strip to form a mating structure that can slide axially and be circumferentially limited.
[0008] Furthermore, the cross-sections of the spiral protrusion and the spiral groove are both trapezoidal, and the spiral protrusion is segmented along the axial direction, with each segment being 5-10 mm long and the interval between segments being 2-5 mm.
[0009] Furthermore, a lubricant layer is provided between the spiral protrusion and the spiral groove.
[0010] Furthermore, the surface of the conductor is coated with a lubricating layer, which is a polytetrafluoroethylene coating or a silicone oil coating.
[0011] Furthermore, a buffer layer is provided between the tensile braided layer and the outer sheath. The buffer layer is extruded from an elastic material and is used to absorb the radial pressure generated during bending.
[0012] Furthermore, a shielding layer is provided between the tensile braided layer and the buffer layer, and the shielding layer is a tin-plated copper wire braided mesh or an aluminum foil wrapping structure.
[0013] Furthermore, the tensile braided layer is a bidirectional braided structure, comprising a first braided layer woven along a first direction and a second braided layer woven along a second direction, wherein the first direction is opposite to the second direction.
[0014] Furthermore, the central elastic body has an axially arranged tensile core inside, which is a fiber bundle or a stranded rope; a hollow layer is provided between the tensile core and the central elastic body, which is filled with lightweight foam.
[0015] Furthermore, the outer surface of the outer sheath is provided with an environmentally resistant coating, which is a fluorocarbon coating or a polytetrafluoroethylene impregnation layer; a primer layer is provided between the outer sheath and the environmentally resistant coating to improve the adhesion of the coating.
[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) Resistance to repeated pulling: The conductor can slide along the axial direction of the spiral conductor groove when embedded in it, and actively releases stress during stretching and bending to avoid fatigue fracture of the conductor; the tensile braided layer and the tensile core in the central elastic body jointly bear the axial tensile force and share the tensile force on the conductor.
[0017] (2) Wear resistance: The spiral strip isolates the conductor from the outer sheath, preventing the conductor from directly contacting the outer sheath and converting the scraping wear between the conductor and the outer sheath into sliding friction between the conductor and the spiral strip; the lubricating layer on the surface of the conductor further reduces the coefficient of sliding friction; the gear pair formed by the anti-torsion inner sheath and the spiral strip reduces relative sliding; the multi-layer structure such as the isolation layer and the buffer layer further reduces internal wear.
[0018] (3) Torsion resistance: The spiral protrusion of the anti-torsion inner sheath and the spiral groove on the back of the spiral strip form a circumferential limiting fit, which effectively resists torsion and prevents the cable from twisting.
[0019] (4) High flexibility: The spiral strip presses the conductor but does not lock it, allowing the conductor to slide; the central elastic body provides elastic support; the multi-layer structure design keeps the cable flexible.
[0020] (5) Long service life: Through the synergistic effect of multiple levels and mechanisms, the service life of the cable under repeated bending, stretching and torsion conditions is significantly improved. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the cross-sectional structure of the cable of the present invention.
[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the cable of the present invention after removing the shielding layer, buffer layer and outer sheath.
[0023] Figure 3 Figure 2 A magnified view of a portion of point A in the middle.
[0024] Figure 4 This is a schematic diagram of the cable structure of the present invention after removing the shielding layer, buffer layer, outer sheath, and anti-torsion inner sheath.
[0025] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure.
[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the central elastic body described in this invention.
[0027] As shown in the figure: 1-Central elastomer, 11-Helical wire groove, 12-Helical mounting groove, 13-Micro groove, 2-Wire, 3-Helical strip, 31-Snap protrusion, 32-Helical groove, 4-Anti-torsion inner sheath, 41-Helical protrusion, 5-Tension braided layer, 6-Shielding layer, 7-Buffer layer, 8-Outer sheath, 9-Tension core, 10-Hollow layer. Detailed Implementation
[0028] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.
[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to 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 invention based on the specific circumstances. Example 1
[0031] like Figures 1 to 6 As shown, this embodiment provides a wear-resistant flexible cable that resists repeated pulling, including a central elastic body 1, an anti-torsion inner sheath 4, an anti-tension braided layer 5, a shielding layer 6, a buffer layer 7, and an outer sheath 8.
[0032] The central elastomer 1 is made of silicone rubber with a hardness of 25-35 (preferably 30 Shore A). Its outer surface is provided with six spiral wire grooves 11 and six spiral mounting grooves 12. The spiral wire grooves 11 and spiral mounting grooves 12 are arranged alternately and are parallel to each other.
[0033] A wire 2 is embedded in each of the six spiral wire grooves 11. The wire 2 is made of multiple strands of tin-plated copper wire twisted together and wrapped with an insulation layer. The insulation layer is a thermoplastic elastomer (TPE) with a hardness of 60-70 (preferably 65 Shore A). Polytetrafluoroethylene (PTFE) emulsion is sprayed on the surface of the insulation layer of the wire 2 to form a lubricating layer with a thickness of 0.2 μm, which is used to reduce the sliding friction coefficient between the wire 2 and the spiral strip 3.
[0034] A spiral strip 3 is embedded in each of the six spiral mounting grooves 12. The spiral strip 3 is made of thermoplastic polyurethane (TPU) with a hardness of 50-60 Shore A (preferably 55 Shore A, lower than the hardness of the insulation layer of the conductor 2). The cross-section of the spiral strip 3 is T-shaped, and the length of its two extended portions is greater than the distance between adjacent spiral conductor grooves 11, respectively pressing down at least a portion of two adjacent conductors 2. The two side walls of the spiral strip 3 are provided with locking protrusions 31 (strip-shaped protrusions), and the side walls of the spiral conductor grooves 11 are provided with micro-grooves 13. The locking protrusions 31 and the micro-grooves 13 form a self-locking engagement, locking the spiral strip 3 in the spiral conductor grooves 11, maintaining effective limiting of the conductor 2, and preventing the conductor 2 from coming out of the spiral conductor grooves 11. A spiral groove 32 is provided on the back of each spiral strip 3 along its length.
[0035] An anti-torsion inner sleeve 4, made of wear-resistant polyurethane, surrounds the spiral strip 3 and has a hardness of 60-70 (preferably 65 Shore A). The inner surface of the anti-torsion inner sleeve 4 has spiral protrusions 41, which are embedded in the spiral grooves 32 on the back of the spiral strip 3, forming a mating structure that allows axial sliding and circumferential positioning. Both the spiral protrusions 41 and the spiral grooves 32 have trapezoidal cross-sections, and the spiral protrusions 41 are segmented along the axial direction, each segment being 8 mm long with a 3 mm interval between segments. A lubricant layer, made of silicone oil, is provided between the spiral protrusions 41 and the spiral grooves 32 to reduce axial sliding friction.
[0036] The tensile braided layer 5 is directly woven onto the outer surface of the anti-torsion inner sheath 4. It is a two-way braided structure, including a first braided layer woven along a first direction and a second braided layer woven along a second direction, with the first direction being opposite to the second direction. The tensile braided layer 5 is made of polyester fiber with a braiding density of 85%.
[0037] The shielding layer 6 is placed between the tensile braided layer 5 and the buffer layer 7. The shielding layer 6 is a tin-plated copper wire braided mesh with a braiding density of 90%, which is used to resist electromagnetic interference.
[0038] A buffer layer 7 is disposed between the shielding layer 6 and the outer sheath 8. It is extruded from thermoplastic elastomer (TPE) with a hardness of 50-60 Shore A (preferably 55 Shore A) and a thickness of 0.5 mm. The buffer layer 7 is used to absorb the radial pressure generated during bending and reduce the compression of the internal structure by the outer sheath 8.
[0039] The outer sheath 8, wrapped around the buffer layer 7, is made of abrasion-resistant polyurethane with a hardness of 70-90 Shore A (preferably 75 Shore A) and a thickness of 1.2 mm. The outer surface of the outer sheath 8 is coated with an environmentally resistant coating, which is a fluorocarbon coating with a thickness of 0.05 mm. A primer layer is provided between the outer sheath 8 and the environmentally resistant coating to improve coating adhesion.
[0040] The central elastic body 1 has an axially arranged tensile core 9 inside, which is an aramid stranded rope with a diameter of 1.5mm. A hollow layer 10 is provided between the tensile core 9 and the central elastic body 1. The hollow layer 10 is filled with lightweight foam to reduce the weight of the cable. Example 2
[0041] The difference between this embodiment and Embodiment 1 is that: the number of spiral wire grooves 11 is 4, corresponding to 4 conductors 2. The cross-section of the spiral strip 3 is Y-shaped. Each segment of the spiral protrusion 41 is 6mm long, and the interval between segments is 2mm. The tensile braided layer 5 is made of aramid fiber. The shielding layer 6 is an aluminum foil wrapping structure with a wrapping overlap rate of 40%. The environmentally resistant coating is a polytetrafluoroethylene impregnation layer. The tensile core 9 is a high-strength polyester fiber bundle with a diameter of 1.2mm. The lubricating layer on the surface of the conductor 2 is a silicone oil coating. Example 3
[0042] The preparation steps of the wear-resistant flexible cable described in Example 1 or 2 are as follows: S1. Preparation of central elastomer 1 Silicone rubber or thermoplastic elastomer material is extruded through an extruder to form a central elastomer 1. The inner wall of the extrusion die is provided with raised textures corresponding to the spiral guide grooves 11 and spiral mounting grooves 12, so that multiple parallel spiral guide grooves 11 and multiple spiral mounting grooves 12 are formed on the outer surface of the extruded central elastomer 1. The spiral guide grooves 11 and spiral mounting grooves 12 are arranged alternately and are parallel to each other.
[0043] S2. Embedded conductor 2 Conductors 2, made of multiple strands of tin-plated copper wire, are guided by guide wheels and pressed into the spiral wire grooves 11 of the central elastic body 1. Before embedding conductors 2, a polytetrafluoroethylene (PTFE) emulsion is sprayed onto the surface of conductors 2 to form a lubricating layer with a thickness of 0.2 μm, which is then dried for later use. The pressure of the guide wheels is controlled within a range that allows conductors 2 to be fully embedded in the grooves without damaging the insulation layer of conductors 2.
[0044] S3. Embedded spiral bar 3 The pre-extruded spiral strips 3 (with a T-shaped or Y-shaped cross-section) are guided by guide wheels and pressed into the spiral mounting grooves 12 of the central elastic body 1. During the pressing process, the extensions on both sides of the spiral strips 3 automatically cover and press against at least a portion of the two adjacent conductors 2. The locking protrusions 31 on the sidewalls of the spiral strips 3 elastically deform during the pressing process and embed into the micro-grooves 13 on the sidewalls of the spiral wire grooves 11, forming a self-locking fit.
[0045] S4. Extruded anti-torsion inner sheath 4 A central elastic body 1, containing a conductor 2 and a spiral strip 3, is fed into an extruder, and an anti-torsion inner sheath 4 is extruded over the spiral strip 3. The inner wall of the extruder die head has spiral raised patterns corresponding to the spiral grooves 32 on the back of the spiral strip 3. During extrusion, the molten polyurethane material is formed under the pressure of the die head, and the spiral raised patterns 41 on its inner surface naturally embed into the spiral grooves 32 on the back of the spiral strip 3, forming a mating structure that can slide axially and is circumferentially limited. After extrusion, it is cooled and shaped in a water-cooling tank.
[0046] S5. Braided tensile braided layer 5 The outer surface of the anti-torsion inner sheath 4 is directly braided in both directions using a braiding machine to form a tensile braided layer 5. During braiding, the first braided layer is braided first along the first direction, and then the second braided layer is braided along the second direction, with the first direction being opposite to the second direction. The braiding material is polyester fiber or aramid fiber, and the braiding density is 80-90%.
[0047] S6. Set the shielding layer 6 A tin-plated copper wire mesh is woven using a braiding machine or aluminum foil is wrapped around the outside of the tensile braided layer 5 to form a shielding layer 6. The shielding layer 6 is located between the tensile braided layer 5 and the buffer layer 7. The braiding coverage is 85-95%, and the wrapping overlap rate is 30-50%.
[0048] S7. Extrusion Buffer Layer 7 A thermoplastic elastomer (TPE) is extruded outside the shielding layer 6 to form a buffer layer 7. The buffer layer 7 has a thickness of 0.3-0.8 mm, a hardness of 50-60 Shore A, and the extrusion temperature is controlled within the material's melting range.
[0049] S8. Extruded outer sheath 8 Wear-resistant polyurethane is extruded outside the buffer layer 7 to form an outer sheath 8. The outer sheath 8 has a thickness of 1.0-1.5 mm and a hardness of 70-90 Shore A. After extrusion, it is cooled and shaped in a water-cooling tank.
[0050] S9. Apply an environmentally resistant coating. A fluorocarbon coating or a polytetrafluoroethylene (PTFE) impregnation layer is sprayed onto the surface of the outer sheath 8 to form an environmentally resistant coating. A primer layer is applied before spraying to improve coating adhesion. The coating thickness is 0.02-0.1 mm, and it is cured in an oven.
[0051] S10. Cooling and winding The prepared cable is thoroughly cooled and shaped in a cooling water tank, and then wound up at a constant tension using a winding tension controller to complete the preparation.
[0052] Working principle
[0053] The cable of this invention achieves resistance to repeated pulling, abrasion, and torsion during operation through the following mechanisms: 1. Anti-repeated stretching mechanism During tension: The cable is subjected to axial tensile force, with the tensile braided layer 5 and tensile core 9 bearing the main tensile force. Conductor 2 slides axially in the helical conductor groove 11, releasing tensile stress and preventing conductor 2 itself from bearing excessive tensile force.
[0054] When the cable is bent: When the cable is bent, the conductor 2 on the inner side of the bend slides inward in the spiral conductor groove 11, and the conductor 2 on the outer side of the bend slides outward, automatically adjusting to the neutral axis position of the bend and eliminating bending stress concentration. At the same time, the spiral protrusion 41 of the anti-torsion inner sheath 4 slides axially in the spiral groove 32 of the spiral strip 3, without causing jamming.
[0055] During combined motion: When bending and stretching occur simultaneously, the axial sliding of conductor 2 and the sliding of helical protrusion 41 in helical groove 32 work together to maintain a relatively stable positional relationship among the layers inside the cable, thus avoiding fatigue fracture caused by stress superposition.
[0056] 2. Wear-resistant mechanism Sliding friction between conductor and spiral strip: The spiral strip 3 isolates the conductor 2 from the outer sheath 8, so the conductor 2 does not directly contact the outer sheath 8, thus transforming the scraping wear between the conductor and the outer sheath into sliding friction between the conductor and the spiral strip. The lubricating layer (PTFE coating) on the surface of the conductor 2 significantly reduces the coefficient of sliding friction, thereby greatly reducing the wear rate.
[0057] Lubrication of the convex-concave fit: A lubricant layer (silicone oil) is provided between the spiral protrusion 41 and the spiral groove 32, which provides continuous lubrication during axial sliding and reduces friction and wear.
[0058] Interlayer buffer: The buffer layer 7 is set between the tensile braided layer 5 and the outer sheath 8 to absorb the radial pressure generated during bending, reduce the compression of the inner structure by the outer sheath 8, and prevent the "birdcage effect" of the sheath from occurring.
[0059] External protection: The environmentally resistant coating reduces the coefficient of friction between the outer sheath 8 and the external environment, improving scratch resistance and chemical corrosion resistance.
[0060] 3. Anti-torsion mechanism Circumferential limiting: When the cable is subjected to torsional torque, the spiral protrusion 41 of the anti-torsion inner sheath 4 and the spiral groove 32 on the back of the spiral strip 3 form a circumferential limiting engagement. The sidewalls of the protrusion and the groove abut against each other during torsion, transferring the torsional torque from the anti-torsion inner sheath 4 to the spiral strip 3, and then to the tensile braided layer 5 and the outer sheath 8, preventing internal kinking of the cable.
[0061] Bidirectional weaving for torsional synergy: The tensile braided layer 5 has a bidirectional weaving structure, with the first braided layer 51 and the second braided layer 52 having opposite directions. When twisted, they generate a reverse restoring torque, which further enhances the torsional resistance.
[0062] 4. Self-locking and fixing mechanism Self-locking protrusion: The protrusion 31 on the side wall of the spiral strip 3 forms a self-locking fit with the micro-groove 13 on the side wall of the spiral wire groove 11. After long-term repeated bending and stretching, even if the spiral strip 3 undergoes creep or elastic decay, the protrusion 31 can still be mechanically locked in the micro-groove 13 to prevent the spiral strip 3 from coming out of the mounting groove 12 and maintain stable pressing on the conductor 2.
[0063] Interlayer synergy: The central elastomer 1 provides elastic support, the tensile braided layer 5 provides axial strength, the shielding layer 6 provides electromagnetic protection, the buffer layer 7 absorbs shocks, and the outer sheath 8 provides final protection. The layers work together to ensure that the cable maintains structural integrity and functionality under extreme operating conditions.
[0064] Through the synergistic effect of the above-mentioned multiple mechanisms, the cable of the present invention has excellent fatigue resistance, wear resistance and long service life under repeated bending, stretching and torsion conditions.
[0065] Other aspects of this invention that are not detailed herein are all conventional techniques known to those skilled in the art.
[0066] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0067] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this invention shall fall within the scope of protection of this invention.
Claims
1. A wear-resistant flexible cable resistant to repeated pulling, characterized in that: The device includes a central elastomer, an anti-torsion inner sheath, a tensile braided layer, and an outer sheath. The central elastomer is made of an elastic material, and its outer surface has multiple helical wire grooves and multiple helical mounting grooves, which are arranged alternately and parallel to each other. A wire is embedded in each helical wire groove. A helical strip is embedded in each helical mounting groove, and the two sides of the helical strip extend to both sides, respectively pressing down at least a portion of two adjacent wires. The anti-torsion inner sheath covers the helical strip. The tensile braided layer covers the anti-torsion inner sheath. The outer sheath covers the tensile braided layer.
2. The cable according to claim 1, characterized in that: The cross-section of the spiral strip is "T" or "Y" shaped, and the length of its two side extensions is greater than the distance between adjacent spiral guide grooves; the two side walls of the spiral strip are provided with locking protrusions, and the side walls of the spiral guide grooves are provided with micro grooves, and the locking protrusions and the micro grooves form a self-locking fit.
3. The cable according to claim 1, characterized in that: Each spiral strip has a spiral groove along its length on its back; the inner surface of the anti-torsion inner sheath has a spiral protrusion corresponding to each spiral strip, and the spiral protrusion is embedded in the spiral groove on the back of the corresponding spiral strip to form a mating structure that can slide axially and be circumferentially limited.
4. The wear-resistant flexible cable resistant to repeated pulling according to claim 1, characterized in that: Both the spiral protrusion and the spiral groove have trapezoidal cross sections, and the spiral protrusion is segmented along the axial direction, with each segment being 5-10 mm long and the interval between segments being 2-5 mm.
5. The wear-resistant flexible cable resistant to repeated pulling according to claim 1, characterized in that: Furthermore, the surface of the conductor is coated with a lubricating layer, which is a polytetrafluoroethylene coating or a silicone oil coating.
6. The wear-resistant flexible cable resistant to repeated pulling according to claim 1, characterized in that: A buffer layer is provided between the tensile braided layer and the outer sheath. The buffer layer is extruded from an elastic material and is used to absorb the radial pressure generated during bending.
7. The wear-resistant flexible cable resistant to repeated pulling according to claim 6, characterized in that: A shielding layer is provided between the tensile braided layer and the buffer layer. The shielding layer is a tin-plated copper wire braided mesh or an aluminum foil wrapping structure.
8. The wear-resistant flexible cable resistant to repeated pulling according to claim 1, characterized in that: The tensile braided layer is a bidirectional braided structure, comprising a first braided layer woven along a first direction and a second braided layer woven along a second direction, wherein the first direction is opposite to the second direction.
9. The wear-resistant flexible cable resistant to repeated pulling according to claim 1, characterized in that: The central elastomer has an axially arranged tensile core inside, which is a fiber bundle or a stranded rope; a hollow layer is provided between the tensile core and the central elastomer, which is filled with lightweight foam.
10. The wear-resistant flexible cable resistant to repeated pulling according to claim 1, characterized in that: The outer surface of the outer sheath is provided with an environmentally resistant coating, which is a fluorocarbon coating or a polytetrafluoroethylene impregnation layer; a primer layer is provided between the outer sheath and the environmentally resistant coating to improve the adhesion of the coating.