Bending-resistant wear-resistant low-voltage cable

Abstract

The application provides a kind of anti-bending wear-resistant low-voltage cable, relating to low-voltage cable technical field, including cable core assembly, inner liner, inner sheath, mechanical reinforcement layer, gap type spiral slow bending band, spiral bending limiting band and wear-resistant outer sheath;The inner liner, inner sheath and mechanical reinforcement layer are sequentially coated outside the cable core assembly, and the gap type spiral slow bending band is wrapped around the outer periphery of the mechanical reinforcement layer at a constant pitch, forming a spiral gap between adjacent band coils;The slow bending band has a support ridge extending along the axial direction of the cable and not extending along the spiral wrapping path outside the band base, and a stop shoulder is provided on the edge, the spiral bending limiting band is arranged in the spiral gap, and the stop shoulder contacts the spiral bending limiting band to limit bending when the cable is bent;The wear-resistant outer sheath is embedded with an indicating core and has longitudinal wear-resistant ribs on the outer periphery, and the longitudinal wear-resistant ribs, the embedded indicating core and the support ridge correspond radially.

Description

Technical Field

[0001] This invention relates to the field of low-voltage cable technology, and in particular to a bending-resistant and abrasion-resistant low-voltage cable. Background Technology

[0002] Low-voltage cables are used to transmit and distribute electrical energy within their rated voltage range. They are characterized by flexible wiring layout, convenient power supply connection, and wide applicability. Low-voltage cables can be laid along equipment, cable trays, or the ground, and are suitable for lines with bends and space constraints. Some low-voltage cables also need to withstand bending, dragging, and external friction during installation, maintenance, or equipment relocation. Low-voltage cables are widely used in industrial equipment, construction machinery, production lines, and other low-voltage power supply applications.

[0003] Compared with ordinary fixed-lay conductors, low-voltage cables must ensure the insulation performance between conductive cores and the stability of the cable core structure, while also considering the cable's bending adaptability when bending, dragging, and contacting external surfaces, as well as the mechanical protection capability of the outer sheath.

[0004] Most existing low-voltage cables improve wear resistance by increasing the thickness and hardness of the outer sheath or by adding mechanical reinforcement layers. When the cable bends, it mainly relies on the deformation of each sheath layer and filling structure itself. It lacks a structure that provides deformation margin during normal bending and creates contact limit when the bending degree is too large. It is prone to small-radius sharp bends. At the same time, external friction and local extrusion pressure can easily be directly concentrated on the outer sheath, making it difficult to observe the wear degree of the outer sheath and affecting the stability of the cable's use. Summary of the Invention

[0005] To address the technical problems of existing low-voltage cables relying primarily on the deformation of their sheath layers and filling structures during bending, lacking a structure to provide deformation allowance during normal bending and to create contact limits when bending is excessive, which easily leads to sharp bends with small radii, and where external friction and localized compressive stress are easily concentrated on the outer sheath, making it difficult to observe the wear of the outer sheath and affecting the stability of cable use, this invention provides a bending-resistant and wear-resistant low-voltage cable.

[0006] The technical solutions provided by the embodiments of the present invention are as follows: The present invention provides a bending-resistant and wear-resistant low-voltage cable, comprising: a cable core assembly, an inner sheath, a mechanical reinforcement layer, a gapped spiral bend-reducing strip, a spiral bend-limiting strip, and a wear-resistant outer sheath; The inner sheath covers the outside of the cable core assembly, the mechanical reinforcement layer covers the outside of the inner sheath, and the intermittent spiral bending tape wraps around the outer periphery of the mechanical reinforcement layer at a constant pitch, forming a spiral gap between adjacent tape loops; The intermittent spiral bend tape includes a bend tape base, a support ridge, and a stop shoulder. The support ridge is disposed outside the bend tape base and extends along the cable axis after the intermittent spiral bend tape is wrapped around the mechanical reinforcement layer, and does not extend along the spiral winding path of the intermittent spiral bend tape. The stop shoulder is disposed at the edge of the base of the bend tape, and the spiral bend limiting tape is disposed within the spiral gap. When the cable bends, the stop shoulder located on the inner side of the bend contacts the spiral bend limiting tape to limit the bend. The wear-resistant outer sheath covers the intermittent spiral bend band and the spiral bend limiting band. The outer circumference of the wear-resistant outer sheath is integrally provided with longitudinal wear-resistant ribs extending along the cable axis. The longitudinal wear-resistant ribs are arranged radially along the cable axis corresponding to the support ridge.

[0007] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this invention, the intermittent spiral bend tape wraps around the outer periphery of the mechanical reinforcement layer at a constant pitch. The spiral gap between adjacent tape loops provides deformation allowance for normal cable bending. When the degree of cable bending increases, the stop shoulder located on the inner side of the bend contacts the spiral bend limiting tape to restrict the adjacent tape loops from continuing to approach each other and suppress the cable from undergoing a small-radius sharp bend. The longitudinal wear-resistant ribs on the outer periphery of the wear-resistant outer sheath first contact the external contact surface. The longitudinal wear-resistant ribs correspond radially to the support ridge, so that the external load can be transmitted to the support ridge through the wear-resistant outer sheath and the embedded indicator core, and then transmitted to the inner sheath through the bend tape base and the mechanical reinforcement layer to disperse external friction and local extrusion pressure, thereby improving the structural stability of the cable during bending and dragging. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of a bend-resistant and wear-resistant low-voltage cable provided in an embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of the cross-sectional structure of a bending-resistant and wear-resistant low-voltage cable provided in an embodiment of the present invention.

[0011] Figure 3 This is a partially exploded structural diagram of the wear-resistant outer sheath assembly and the gentle bending assembly of an anti-bending and wear-resistant low-voltage cable provided in an embodiment of the present invention.

[0012] Figure 4This is a schematic diagram of the structure of a bend-resistant and wear-resistant low-voltage cable after removing part of the wear-resistant outer sheath, as provided in an embodiment of the present invention.

[0013] Figure 5 This is an exploded structural diagram of a gap-type spiral bend strip for a low-voltage cable that is resistant to bending and abrasion, provided as an embodiment of the present invention.

[0014] Figure 6 This is a schematic diagram of the cross-sectional structure of a gap-type spiral bend strip in a low-voltage cable that is resistant to bending and abrasion, as provided in an embodiment of the present invention.

[0015] Figure 7 This is a schematic diagram of the exposed structure of the inner sheath reinforcement component and the gentle bending component of an anti-bending and wear-resistant low-voltage cable provided in an embodiment of the present invention.

[0016] Figure 8 This is a partially exploded structural diagram of the inner sheath reinforcement component, the bend-resistant component, and the wear-resistant outer sheath component of an anti-bending and wear-resistant low-voltage cable provided in an embodiment of the present invention.

[0017] Figure 9 This is an exploded structural diagram of the core assembly, inner sheath reinforcement assembly, gentle bending assembly, and wear-resistant outer sheath assembly of a low-voltage cable with bend resistance and wear resistance provided in an embodiment of the present invention.

[0018] Reference numerals: 1. Cable core assembly; 2. Inner sheath reinforcement assembly; 3. Bending assembly; 4. Abrasion-resistant outer sheath assembly; 11. Low-voltage conductive core; 12. Core insulation layer; 13. Elastic filler; 14. Wrapping isolation layer; 21. Inner lining layer; 22. Inner sheath; 23. Mechanical reinforcement layer; 31. Intermittent spiral bending tape; 41. Abrasion-resistant outer sheath; 42. Embedded indicator core; 43. Spiral bending limit tape; 44. Longitudinal abrasion-resistant rib; 311. Bending tape base; 312. Spiral gap; 313. Support ridge; 314. Stop shoulder.

[0019] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0020] The technical solutions of the present invention will now be described with reference to the accompanying drawings. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art can use other alternative methods to implement some well-known technologies. Furthermore, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0021] like Figures 1 to 9 As shown, an embodiment of the present invention provides a bending-resistant and wear-resistant low-voltage cable, comprising: a cable core assembly 1, an inner sheath reinforcement assembly 2, a gentle bending assembly 3, and a wear-resistant outer sheath assembly 4.

[0022] The inner sheath reinforcement component 2 covers the outside of the cable core assembly 1. The bend-restraining component 3 is disposed outside the inner sheath reinforcement component 2. The abrasion-resistant outer sheath component 4 covers the outside of the bend-restraining component 3, thereby forming a conductive insulation structure, an internal protection structure, a bend-restraining limiting structure, and an external abrasion-resistant structure arranged sequentially from the center of the cable to the outer periphery.

[0023] The cable core assembly 1 includes low-voltage conductive cores 11, core insulation layers 12, elastic fillers 13, and wrapping isolation layers 14. Multiple low-voltage conductive cores 11 are provided, with core insulation layers 12 covering the exterior of each low-voltage conductive core 11. Elastic fillers 13 are disposed between adjacent core insulation layers 12, and wrapping isolation layers 14 cover the exterior of each core insulation layer 12 and the elastic filler 13.

[0024] In one possible implementation, four low-voltage conductive cores 11 are provided, and the four low-voltage conductive cores 11 are twisted around an elastic filler 13. The elastic filler 13 fills the gaps between the insulation layers 12 of the four cores and together with the insulation layers 12, forms a rounded outer periphery of the cable core. The wrapping isolation layer 14 continuously wraps around the rounded outer periphery of the cable core to limit the radial dispersion of the core insulation layers 12 and the elastic filler 13.

[0025] It should be noted that the number of low-voltage conductive cores 11 can be adjusted according to the number of phases and functional requirements of the low-voltage transmission line. The four-core structure shown in the attached figure is used to illustrate the relative positions between the layers. The core insulation layer 12 is used to insulate each low-voltage conductive core 11 from each other. The elastic filler 13 is used to fill the gaps in the cabling and to provide deformation allowance for the slight relative displacement between the insulated cores during bending. The wrapping isolation layer 14 is used to maintain the cable core assembly state.

[0026] Reference Figure 2 , Figures 7 to 9 The inner reinforcement component 2 includes an inner liner 21, an inner sheath 22, and a mechanical reinforcement layer 23. The inner liner 21 covers the outside of the wrapping isolation layer 14, the inner sheath 22 covers the outside of the inner liner 21, and the mechanical reinforcement layer 23 covers the outside of the inner sheath 22.

[0027] The inner liner 21 is disposed between the wrapping isolation layer 14 and the inner sheath 22 to separate the cable core assembly 1 and the inner sheath 22. The inner sheath 22 continuously covers the outside of the inner liner 21 to protect the cable core assembly 1. The mechanical reinforcement layer 23 consists of multiple reinforcing members arranged circumferentially along the cable, each reinforcing member extending axially along the cable and disposed on the outer periphery of the inner sheath 22. The mechanical reinforcement layer 23 forms the outer mounting reference for the winding of the bendable assembly 3.

[0028] It should be noted that the inner sheath 22 is used to cover and protect the cable core assembly 1, and the mechanical reinforcement layer 23 is disposed outside the inner sheath 22 to bear the axial tensile force and radial compressive force on the cable. The specific materials and cross-sectional forms of each reinforcing member can be set according to the bending level and load-bearing requirements of the cable. The attached figure is used to show the inner liner 21, the inner sheath 22 and the mechanical reinforcement layer 23 arranged from the inside to the outside, and the structural relationship of each reinforcing member arranged circumferentially and extending axially.

[0029] Reference Figures 3 to 6 The bend-reducing assembly 3 includes an intermittent spiral bend-reducing belt 31 and a spiral bend-limiting belt 43. The intermittent spiral bend-reducing belt 31 is wrapped around the outer periphery of the mechanical reinforcement layer 23 at a constant pitch, and the spiral bend-limiting belt 43 is disposed between adjacent belt loops along the winding direction of the intermittent spiral bend-reducing belt 31.

[0030] The intermittent spiral bend belt 31 includes a bend belt base 311, a spiral gap 312, a support ridge 313, and a stop shoulder 314. The bend belt base 311 is disposed close to the outer periphery of the mechanical reinforcement layer 23. The spiral gap 312 is formed between adjacent loops of the bend belt base 311. The support ridge 313 is disposed on the outer side of the bend belt base 311. The stop shoulder 314 is disposed at the edge of the bend belt base 311.

[0031] Furthermore, the base 311 of the bendable tape is a continuous strip-shaped component that can be spirally wound around the outer periphery of the mechanical reinforcement layer 23, and the inner surface of the base 311 is adapted to the outer periphery formed by the mechanical reinforcement layer 23. Adjacent tape loops do not overlap each other, and are separated from each other by a spiral gap 312, so that the gapped spiral bendable tape 31 has space for axial spacing changes in the initial stage of cable bending.

[0032] The support ridge 313 includes multiple spaced-apart strip-shaped ridges. Each strip-shaped ridge is disposed on the outer surface of the bend tape base 311 and arranged along the width direction of the bend tape base 311. The bend tape base 311 is wound around the mechanical reinforcement layer 23, and each strip-shaped ridge extends along the cable axial direction, with its extension direction intersecting the spiral winding direction of the intermittent spiral bend tape 31.

[0033] It should be noted that the support ridge 313 does not extend along the spiral winding path of the intermittent spiral bending tape 31. The support ridges 313 on adjacent loops are arranged correspondingly along the cable axis, so that multiple axial support positions are formed on the outer side of the bending tape base 311. The support positions are used to bear the radial load transmitted by the wear-resistant outer sheath assembly 4 and to prevent the load from being concentrated and transmitted only along the spiral direction of the intermittent spiral bending tape 31.

[0034] In one possible implementation, the stop shoulder 314 includes a first stop shoulder and a second stop shoulder. The first stop shoulder and the second stop shoulder are respectively formed on the two side edges of the bendable belt base 311 and face the helical gap 312. The helical bend-limiting belt 43 is located between the first stop shoulder and the second stop shoulder of the adjacent belt loop.

[0035] The spiral bend-limiting belt 43 includes a bend-limiting belt substrate and bend-limiting contact surfaces formed on both sides of the bend-limiting belt substrate. The bend-limiting belt substrate is continuously arranged along the spiral gap 312, and its two bend-limiting contact surfaces face the first stop shoulder and the second stop shoulder on the adjacent belt loop, respectively. The spiral bend-limiting belt 43 is radially covered and held within the spiral gap 312 by the wear-resistant outer protective component 4.

[0036] When the cable is in a straight state or a large-radius bend, a deformation allowance is left between the bend-limiting contact surface and the corresponding stop shoulder 314. The helical gap 312 allows adjacent loops to approach or move away from each other along the cable axis, and the helical bend-limiting band 43 maintains its corresponding position within the helical gap 312 without blocking the normal bending of the cable within the deformation allowance range.

[0037] As the cable bend increases, adjacent loops on the inner side of the bend move closer to each other, and the stop shoulder 314 at that location moves towards the corresponding bend-limiting contact surface along with the base 311 of the bend-limiting tape. After the stop shoulder 314 comes into contact with the spiral bend-limiting tape 43, the spiral bend-limiting tape 43 blocks the adjacent loops from moving closer, thus limiting the spiral gap 312 from continuing to shrink.

[0038] It should be noted that a bending-limiting contact relationship is formed between the stop shoulder 314 and the spiral bending-limiting band 43, and the base 311 of the gentle bending band is used to bear and transmit the force on the stop shoulder 314. The opposite sides of the stop shoulder 314 and the spiral bending-limiting band 43 can be set as mutually adaptable planes, arc surfaces or inclined surfaces to increase the contact area and reduce local stress concentration at the contact point.

[0039] Reference Figures 1 to 4 The wear-resistant outer protective component 4 includes a wear-resistant outer sleeve 41, an embedded indicator core 42, and longitudinal wear-resistant ribs 44. The wear-resistant outer sleeve 41 covers the outside of the intermittent spiral bend belt 31 and the spiral bend-limiting belt 43. The embedded indicator core 42 is embedded inside the wear-resistant outer sleeve 41. The longitudinal wear-resistant ribs 44 are integrally formed on the outer periphery of the wear-resistant outer sleeve 41.

[0040] Multiple longitudinal wear-resistant ribs 44 are provided, which are spaced apart from each other along the circumference of the wear-resistant outer sheath 41 and extend along the cable axis. Each longitudinal wear-resistant rib 44 protrudes outward from the reference outer circumferential surface of the wear-resistant outer sheath 41, so that when the cable contacts the ground, guide surface or equipment surface, the longitudinal wear-resistant rib 44 contacts the external contact surface before the reference outer circumferential surface of the wear-resistant outer sheath 41.

[0041] Furthermore, the embedded indicator core 42 extends along the length direction of the corresponding longitudinal wear-resistant rib 44 and is located radially inside the longitudinal wear-resistant rib 44. The outer edge of the embedded indicator core 42 is located between the top surface of the longitudinal wear-resistant rib 44 and the reference outer peripheral surface of the wear-resistant outer sheath 41, so that the longitudinal wear-resistant rib 44 covers the embedded indicator core 42 in the initial state.

[0042] In one possible implementation, the embedded indicator core 42 and the wear-resistant outer sheath 41 have a visible difference. The visible difference can be formed by a color difference. When the longitudinal wear-resistant rib 44 has not worn to the depth where the embedded indicator core 42 is located, the embedded indicator core 42 cannot be observed from the outside of the cable. When the longitudinal wear-resistant rib 44 wears to the depth where the embedded indicator core 42 is located, the embedded indicator core 42 is exposed from the worn area.

[0043] The longitudinal abrasion-resistant rib 44, the embedded indicator core 42, and the support ridge 313 are arranged radially along the cable. The embedded indicator core 42 is located between the longitudinal abrasion-resistant rib 44 and the support ridge 313. The radially outer side of the support ridge 313 corresponds to the area where the embedded indicator core 42 is located through the abrasion-resistant outer sheath 41, and the radially inner side of the support ridge 313 is connected to the base 311 of the bend tape.

[0044] When the longitudinal wear-resistant rib 44 is subjected to external compression or frictional impact, the external load first acts on the longitudinal wear-resistant rib 44, and then is transferred from the longitudinal wear-resistant rib 44 to the wear-resistant outer sheath 41 and the embedded indicator core 42. The wear-resistant outer sheath 41 and the embedded indicator core 42 transfer the load to the radially corresponding support ridge 313, the support ridge 313 transfers the load to the bend belt base 311, the bend belt base 311 transfers the load to the mechanical reinforcement layer 23, and the mechanical reinforcement layer 23 transfers the load to the inner sheath 22.

[0045] It should be noted that the longitudinal wear-resistant rib 44 disperses the contact load through its external protrusions extending along the cable axial direction, while the support ridge 313 bears the corresponding load through its internal protrusions extending along the cable axial direction. The longitudinal wear-resistant rib 44, the embedded indicator core 42, the support ridge 313, the bend tape base 311, the mechanical reinforcement layer 23, and the inner sheath 22 form a pressure-bearing path extending from the outer periphery of the cable inward, so that local loads are not directly concentrated on the cable core assembly 1.

[0046] In one possible implementation, the low-voltage cable forming process includes: first, wrapping the insulation layer 12 of each core around the corresponding low-voltage conductive core 11; then, twisting the insulated cores around the elastic filler 13; and finally, wrapping an isolation layer 14 around the outer periphery of the cable. Subsequently, an inner lining layer 21, an inner sheath 22, and a mechanical reinforcement layer 23 are formed sequentially. Next, a gapped spiral bend tape 31 is wound around the outer periphery of the mechanical reinforcement layer 23 at a constant pitch, and a spiral bend-limiting tape 43 is placed within the spiral gap 312. Finally, a wear-resistant outer sheath 41 is formed on the outside of the bend tape assembly 3, and an embedded indicator core 42 and longitudinal wear-resistant ribs 44 are simultaneously formed during the formation of the wear-resistant outer sheath 41.

[0047] The intermittent spiral bend tape 31 and spiral bend limiting tape 43 can be wound with continuous strip material, and the wear-resistant outer sheath 41 can be continuously wrapped by extrusion. The embedded indicator core 42 can be embedded in the area corresponding to the longitudinal wear-resistant rib 44 when the wear-resistant outer sheath 41 is formed. The longitudinal wear-resistant rib 44 is integrally formed with the wear-resistant outer sheath 41, so that the wear-resistant outer sheath assembly 4 remains continuous along the length of the cable.

[0048] In one possible implementation, the operation of the low-voltage cable includes: First working process: When the cable is in a straight state or a large radius bend, the spiral gap 312 between adjacent loops maintains the initial spacing, and the stop shoulder 314 and the spiral bending limit band 43 leave a deformation allowance. The cable core assembly 1, inner sheath reinforcement assembly 2, gentle bending assembly 3 and wear-resistant outer sheath assembly 4 work together to maintain the roundness of the cable.

[0049] Second working process: When the cable begins to bend, the adjacent loops on the outside of the bend move away from each other, increasing the helical gap 312 on the outside of the bend. The adjacent loops on the inside of the bend move closer to each other, decreasing the helical gap 312 on the inside of the bend. The inner sheath 22, mechanical reinforcement layer 23, bending tape base 311 and wear-resistant outer sheath 41 bend and deform along with the cable as a whole.

[0050] The third working process: When the cable continues to bend, the stop shoulder 314 located on the inside of the bend moves closer to the spiral bend limiting band 43 until the stop shoulder 314 abuts against the corresponding bend limiting contact surface. The spiral bend limiting band 43 prevents the adjacent band on the inside of the bend from moving closer, so that the cable changes from a free and gentle bending state to a contact bend limiting state.

[0051] Fourth working process: When the cable is dragged or rubs against the external contact surface, the longitudinal wear-resistant rib 44 first contacts the external contact surface and bears the friction. The load generated by friction and compression is transmitted sequentially through the wear-resistant outer sheath 41 and the embedded indicator core 42 to the support ridge 313, and then through the bending tape base 311 to the mechanical reinforcement layer 23, and then from the mechanical reinforcement layer 23 to the inner sheath 22, so as to radially bear and disperse the local load on the outside of the cable.

[0052] Fifth working process: As the wear depth of the longitudinal wear-resistant rib 44 gradually increases, the coverage thickness of the longitudinal wear-resistant rib 44 on the embedded indicator core 42 gradually decreases. When the wear depth reaches the position of the embedded indicator core 42, the embedded indicator core 42 is exposed from the wear area, so as to indicate the wear degree of the corresponding position through visual difference.

[0053] The sixth working process: When the external force causing the cable to bend is reduced or removed, the inner sheath 22, mechanical reinforcement layer 23, bending tape base 311 and wear-resistant outer sheath 41 jointly undergo recovery deformation, the adjacent tape loops on the inner side of the bend move away from each other, the stop shoulder 314 and the spiral bending limit tape 43 release their contact, the spiral gap 312 recovers its deformation allowance, and the cable re-enters a state where it can bend normally.

[0054] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this invention, the intermittent spiral bend tape wraps around the outer periphery of the mechanical reinforcement layer at a constant pitch. The spiral gap between adjacent tape loops provides deformation allowance for normal cable bending. When the degree of cable bending increases, the stop shoulder located on the inner side of the bend contacts the spiral bend limiting tape to restrict the adjacent tape loops from continuing to approach each other and suppress the cable from undergoing a small-radius sharp bend. The longitudinal wear-resistant ribs on the outer periphery of the wear-resistant outer sheath first contact the external contact surface. The longitudinal wear-resistant ribs correspond radially to the support ridge, so that the external load can be transmitted to the support ridge through the wear-resistant outer sheath and the embedded indicator core, and then transmitted to the inner sheath through the bend tape base and the mechanical reinforcement layer to disperse external friction and local extrusion pressure, thereby improving the structural stability of the cable during bending and dragging.

[0055] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0056] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A bending-resistant and wear-resistant low-voltage cable, characterized in that, include: Cable core assembly, inner sheath, mechanical reinforcement layer, intermittent spiral bend-reducing strip, spiral bend-limiting strip, and wear-resistant outer sheath; The inner sheath covers the outside of the cable core assembly, the mechanical reinforcement layer covers the outside of the inner sheath, and the intermittent spiral bending tape wraps around the outer periphery of the mechanical reinforcement layer at a constant pitch, forming a spiral gap between adjacent tape loops; The intermittent spiral bend tape includes a bend tape base, a support ridge, and a stop shoulder. The support ridge is disposed outside the bend tape base and extends along the cable axis after the intermittent spiral bend tape is wrapped around the mechanical reinforcement layer, and does not extend along the spiral winding path of the intermittent spiral bend tape. The stop shoulder is disposed at the edge of the base of the bend tape, and the spiral bend limiting tape is disposed within the spiral gap. When the cable bends, the stop shoulder located on the inner side of the bend contacts the spiral bend limiting tape to limit the bend. The wear-resistant outer sheath covers the intermittent spiral bend band and the spiral bend limiting band. The outer circumference of the wear-resistant outer sheath is integrally provided with longitudinal wear-resistant ribs extending along the cable axis. The longitudinal wear-resistant ribs are arranged radially along the cable axis corresponding to the support ridge.

2. The bend-resistant and wear-resistant low-voltage cable according to claim 1, characterized in that, The cable core assembly includes: multiple low-voltage conductive cores, core insulation layers respectively covering each of the low-voltage conductive cores, elastic fillers disposed between adjacent core insulation layers, and wrapping isolation layers covering each core insulation layer and the elastic fillers. Each of the low-voltage conductive wire cores is twisted around the elastic filler.

3. The bend-resistant and wear-resistant low-voltage cable according to claim 2, characterized in that, Also includes: Inner lining; The inner lining layer covers the outer layer of the wrapping isolation layer, the inner sheath covers the outer layer of the inner lining layer, and the mechanical reinforcement layer covers the outer layer of the inner sheath; The mechanical reinforcement layer consists of reinforcing members arranged circumferentially along the cable and extending axially along the cable.

4. The bend-resistant and wear-resistant low-voltage cable according to claim 1, characterized in that, The supporting ridge includes: multiple mutually spaced strip-shaped convex ridges; Each of the strip-shaped ridges extends along the cable axial direction and is arranged along the width direction of the base of the bend tape after the intermittent spiral bend tape is wrapped around the mechanical reinforcement layer. The extension direction of the strip-shaped ridges intersects with the spiral winding direction of the intermittent spiral bend tape.

5. The bend-resistant and wear-resistant low-voltage cable according to claim 1, characterized in that, The stop shoulder includes: a first stop shoulder and a second stop shoulder respectively formed on both sides of the edge of the bend belt base; The spiral bend limiting band is located between the first stop shoulder and the second stop shoulder of the adjacent band, with the first stop shoulder and the second stop shoulder facing the two sides of the spiral bend limiting band, respectively.

6. The bend-resistant and wear-resistant low-voltage cable according to claim 5, characterized in that, The spiral bending limiting band includes: a bending limiting band base and bending limiting contact surfaces formed on both sides of the bending limiting band base; When the cable is in a straight state, a deformation allowance is left between each of the bending limit contact surfaces and the corresponding stop shoulder; When the cable is bent, the stop shoulder located on the inside of the bend abuts against the corresponding bend-limiting contact surface.

7. The bend-resistant and wear-resistant low-voltage cable according to claim 1, characterized in that, The longitudinal wear-resistant ribs include: multiple raised ribs spaced apart along the circumference of the wear-resistant outer sheath; Each of the ribs is integrally formed with the wear-resistant outer sheath and protrudes outward from the reference outer periphery of the wear-resistant outer sheath.

8. The bend-resistant and wear-resistant low-voltage cable according to claim 7, characterized in that, It also includes: an embedded indicator chip; The embedded indicator core is embedded in the wear-resistant outer sheath, extends along the length of the longitudinal wear-resistant rib, and is located on the radial inner side of the longitudinal wear-resistant rib. The embedded indicator core and the wear-resistant outer sheath have a visible difference.

9. The bend-resistant and wear-resistant low-voltage cable according to claim 8, characterized in that, The longitudinal wear-resistant ribs, the embedded indicator cores, and the support ridges are arranged radially along the cable. The embedded indicator core is located between the longitudinal wear-resistant rib and the support ridge; The external load borne by the longitudinal wear-resistant rib is transmitted to the support ridge through the wear-resistant outer sheath and the embedded indicator core, then to the mechanical reinforcement layer through the gentle bending belt base, and finally to the inner sheath through the mechanical reinforcement layer.

10. A bending-resistant and wear-resistant low-voltage cable according to claim 8, characterized in that, The outer edge of the embedded indicator core is located between the top surface of the longitudinal wear-resistant rib and the reference outer peripheral surface of the wear-resistant outer sheath; When the wear depth of the longitudinal wear-resistant rib reaches the location of the embedded indicator core, the embedded indicator core becomes visible from the wear area.

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