Wear-resistant charging cable and charging pile thereof

Abstract

The invention relates to the technical field of new energy automobile charging, in particular to a wear-resistant charging cable and a charging pile thereof, the wear-resistant charging cable comprises a cable core body, a belting layer and an outer coating layer which are coaxially arranged in sequence from inside to outside, and the outer coating layer is composed of a TPE inner protective layer and a nylon outer protective layer; the TPE inner protective layer is prepared from the following components in parts by weight: 30 to 31 parts of SEBS (Styrene-Ethylene-Butylene-Styrene) thermoplastic elastomer, 0.5 part of polyphenyl ether, 19 to 20 parts of 150N base oil, 7.7 parts of heavy calcium powder, 2.8 to 2.9 parts of talcum powder, 2 to 3 parts of silicone powder, 0.7 to 0.8 part of 900 cs silicone oil, 9 to 10 parts of magnesium powder, 4 to 5 parts of POE-3000-4 carbon, 3.8 to 3.9 parts of compatilizer, 2.8 to 2.9 parts of color master batch, 0.2 to 0.5 part of activating agent, 0.2 to 0.6 part of antioxidant and 0.1 to 0.4 part of erucyl amide. The outer sheath layer is arranged to be of a double-layer structure, and the thin transparent nylon layer is extruded on the outer sheath layer to enhance the self-cleaning and wear-resistant functions of the outer sheath layer; by improving the material of the TPE inner protective layer, the bending resistance and wear resistance of the charging cable are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle charging, and in particular to a wear-resistant charging cable and a charging pile thereof. Background Art

[0002] With the rapid development of new energy, especially the expansion of the electric vehicle market, the demand for charging pile cables has increased significantly, which has brought unprecedented opportunities and challenges to the cable industry. As an important component connecting the charging pile and the car, the performance of the charging pile cable directly affects the efficiency and safety of charging.

[0003] In actual use, the existing new energy charging pile cables are prone to wear and peeling due to frequent dragging, twisting, tangling, rolling, and scratching. This not only affects the appearance and protection performance of the cable, but may also expose the internal conductor of the cable, increase safety risks such as short circuit and leakage, affect the stability and reliability of charging, and shorten the life of the cable. Summary of the invention

[0004] The present invention provides a wear-resistant charging cable and a charging pile thereof, so as to solve the technical problem that the wear resistance of the existing charging pile cable is difficult to meet the actual use requirements.

[0005] In order to solve the above problems, the present invention provides a wear-resistant charging cable, comprising a cable core, a tape layer and an outer layer coaxially arranged from the inside to the outside, wherein the outer layer is composed of a TPE inner sheath and a nylon outer sheath; the TPE inner sheath comprises the following components in weight proportions: SEBS thermoplastic elastomer 30-31 parts, polyphenylene ether 0.5 parts, 150N base oil 19-20 parts, heavy calcium powder 7.7 parts, talc 2.8-2.9 parts, silicone powder 2-3 parts, 900cs silicone oil 0.7-0.8 parts, magnesium powder 9-10 parts, POE-3000-4 carbon 4-5 parts, compatibilizer 3.8-3.9 parts, masterbatch 2.8-2.9 parts, activator 0.2-0.5 parts, antioxidant 0.2-0.6 parts, erucamide 0.1-0.4 parts.

[0006] The cable core is used to transmit current, the tape layer plays the role of fixing and protecting the internal structure, and the outer layer is mainly responsible for providing wear resistance and protection. The tape layer is set outside the cable core to tightly wrap the cable core together. The tape layer can absorb and disperse the stress generated when the charging cable is bent. When the stress is eliminated, the outer layer drives the internal cable core to return to its original state, reducing the damage to the charging cable caused by external stress, and effectively protecting the cable core inside the charging cable. At the same time, the tape layer also has the function of preventing the cable core from sticking to the outer layer.

[0007] The present invention sets the outer sheath as a double-layer structure, and extrudes a thin transparent nylon layer on the outer sheath to enhance the self-cleaning function of the outer sheath. The nylon material used as the outer sheath has wear resistance, high finish (no dust adhesion) and anti-aging properties. The inner sheath uses a TPE material with certain elasticity and softness to ensure that the overall bending and torsion toughness of the charging cable meets the requirements. The TPE inner sheath has the advantages of good resilience, bending resistance, torsion resistance, good surface finish and good density.

[0008] The TPE inner sheath uses SEBS thermoplastic elastomer as the base material of the TPE inner sheath to provide good elasticity, flexibility and a certain tensile strength.

[0009] PPO polyphenylene ether can improve the heat resistance of the material and synergistically improve mechanical properties such as dimensional stability and mechanical strength with SEBS thermoplastic elastomer.

[0010] 150N base oil can increase the fluidity of the material, improve processing performance, help the components to mix evenly during processing, and improve production efficiency.

[0011] TD350 heavy calcium plays a filling and reinforcing role, reduces costs, and improves hardness and dimensional stability. Talc can improve the rigidity, wear resistance, heat resistance and dimensional stability of the material, improve surface finish, and talc and TD350 heavy calcium together enhance the mechanical properties of the TPE inner protective layer.

[0012] POE-3000-4 carbon can enhance the flexibility and impact resistance of the material, and work together with SEBS thermoplastic elastomer to improve the toughness of the TPE inner sheath.

[0013] Compatibilizers promote the compatibility between different components, improve the uniformity and performance stability of materials, ensure that the components are fully mixed and play their respective advantages, and avoid problems such as phase separation. Activators increase the chemical reactivity of materials, promote cross-linking or other chemical reactions, and help improve the chemical and physical properties of the TPE inner sheath. Antioxidants prevent oxidative degradation of materials during processing and use, extend their service life, and work synergistically with other stabilizers to improve the stability and durability of the TPE inner sheath.

[0014] Silicone powder and 900cs silicone oil can work together to optimize the wear resistance of the material. Erucic acid amide can improve the smoothness and demoulding properties of the material, and work together with 900cs silicone oil, silicone powder, etc. to make the surface of the TPE inner sheath smoother and easier to process and use.

[0015] In summary, each component plays its own unique role in the TPE inner sheath, and through mutual cooperation, the TPE inner sheath has good comprehensive properties such as rebound toughness, strength, wear resistance, weather resistance, and processing performance to meet specific application requirements.

[0016] As a preferred technical solution of the present invention, the activator includes one or more of stearic acid, zinc oxide and calcium oxide.

[0017] As a preferred technical solution of the present invention, the compatibilizer is a maleic anhydride grafted compatibilizer.

[0018] As a preferred technical solution of the present invention, the nylon outer sheath comprises the following components in weight proportions: 5-80 parts of PA665, 10-40 parts of carbon fiber, 5-15 parts of wear-resistant agent, 0.1-1 parts of antioxidant, and 0.5-2 parts of lubricant.

[0019] As a preferred technical solution of the present invention, the cable core is composed of a plurality of wire core components of different cross-sections twisted into a cable by concentric twisting, and the wire core components are composed of two main power cores, one ground core, two auxiliary insulation cores, a control core component and two signal core components. The use of concentric twisting makes the wire core components tightly combined, and the structural integrity of the charging cable is better. When subjected to external forces such as stretching, torsion, and bending, the wire core components restrain each other, are not easily deformed and displaced, and can better maintain the stability of the overall shape and structure. At the same time, concentric twisting can offset or balance the magnetic fields formed by multiple cores to a certain extent, reducing the adverse effects of electromagnetic interference on signal and current transmission.

[0020] As a preferred technical solution of the present invention, the control wire core component is formed by concentrically twisting a plurality of control wire cores and the outer surface is covered with a protective inner sheath.

[0021] As a preferred technical solution of the present invention, the signal wire core component is formed by twisting two signal wire cores and the outer surface is covered with a protective inner sheath.

[0022] As a preferred technical solution of the present invention, the cross-sections of the cores are, from small to large, control cores, signal cores, insulated cores, ground cores, and main power cores; the twist coefficient of the cores with small cross-sections ≥ the twist coefficient of the cores with large cross-sections. The twist coefficient refers to the ratio of the actual length of the stranded wire to the pitch length of the stranded wire. When the twist coefficient of the cores with small cross-sections is greater than the twist coefficient of the cores with large cross-sections, the cores with large cross-sections will first be subjected to the stress of pulling, twisting, and bending of the cable as a whole, which helps to evenly distribute the stresses borne by each cable during operation (the purpose of the cores with large cross-sections bearing large stresses and the cores with small cross-sections bearing small stresses), reduce the possibility of damage to the cores with small cross-sections due to excessive force, and improve the overall performance and service life of the charging cable.

[0023] As a preferred technical solution of the present invention, the conductor elongation of the core is inversely proportional to the cross-section of the core, and the conductor elongation of the small-section core is not less than the conductor elongation of the large-section core. This setting ensures that different cores can maintain good tensile properties and reliability under different conditions of use on the basis of functional realization. The small-section core has good flexibility and stretchability to adapt to changes in charging cables in complex use environments such as bending and twisting, and prevent the small-section core from being broken due to preferential force.

[0024] As a preferred technical solution of the present invention, the ratio of the pitch of the signal wire core component and the control wire core component to their respective outer diameters is 6-8 times; the ratio of the pitch of the insulating wire core to its own outer diameter is 8-10 times; the ratio of the pitch to the outer diameter of the ground wire core and the power main wire core is 12-16 times.

[0025] As a more preferred technical solution of the present invention, a flame retardant filling layer is further provided between the cable core and the tape layer to ensure the roundness of the cable and prevent the cable surface from being uneven. The flame retardancy of the cable can be improved by providing the flame retardant filling layer, further improving the safety of the charging pile.

[0026] As a preferred technical solution of the present invention, the wrapping layer is a non-woven fabric layer.

[0027] Another aspect of the present invention provides a charging pile, comprising the charging cable as described above, a winding wheel and a charging pile body, wherein the winding wheel is fixedly arranged on one side of the charging pile body, and the winding wheel is used to store the charging cable.

[0028] As a preferred technical solution of the present invention, a cleaning elastomer is provided on the winding wheel.

[0029] The beneficial effects are: The present invention sets the outer layer as a double-layer structure, and the outer sheath is extruded with a thin transparent nylon layer to enhance the self-cleaning function of the outer layer. The nylon material selected as the outer sheath has wear resistance, high finish (no dust adhesion) and anti-aging performance. The inner sheath is made of TPE material with certain elasticity and softness. By improving the TPE formula, the overall bending resistance, torsional toughness and wear resistance of the charging cable are improved, so that it meets the use scenarios with higher performance requirements. In order to solve the problem that the small-section core is easily damaged and to improve the overall performance and service life of the charging cable, the present invention sets the twist coefficient of the small-section core ≥ the twist coefficient of the large-section core to ensure that the large-section core is subjected to greater stress during bending, torsion and stretching, and reduces the possibility of damage to the small-section core due to excessive force. At the same time, the conductor elongation of the small-section core is set to be not less than the conductor elongation of the large-section core, ensuring that the small-section core has good flexibility and stretchability to adapt to the changes of the charging cable in complex use environments such as bending and torsion, and prevent the risk of small-section core breakage. BRIEF DESCRIPTION OF THE DRAWINGS By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 This is a schematic diagram of the structure of the wear-resistant charging cable of the present invention; Figure 2 It is a structural diagram of a charging pile; Figure 3 A cross-sectional view of the reel with the filler installed.

[0030] Description of reference numerals: 1. Ground wire core; 2. Insulated wire core; 3. Main power wire core; 4. Control wire core component; 5. Signal wire core component; 6. Tape layer; 7. TPE inner sheath; 8. Nylon outer sheath; 9. Charging cable; 10. Reel; 11. Rotating shaft; 12. Cleaning elastomer; 13. Dust cover; 14. Filler. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] In actual use, charging pile cables are frequently dragged, bent, and moved, which not only easily causes problems such as wear and peeling of the cable outer layer, but also exposes the internal conductor of the cable, increasing safety risks such as short circuit and leakage; and because the cables are inevitably twisted, bent, and dragged during use, it is easy to cause the internal wire core to bend and misalign over a long period of time. Since the signal wire core and small-sized auxiliary power wire core inside the cable are usually thinner, they are more sensitive to mechanical stress and are more likely to be damaged or even broken. This situation will not only lead to unstable cable functions, such as interruption of signal transmission or unstable power supply, but also increase maintenance and replacement costs, placing a financial burden on charging pile operators.

[0033] In order to solve the problems of easy wear and peeling of the outer sheath of the cable, various methods have been tried in the prior art to improve the wear resistance of the charging pile cable. For example, the Chinese invention patent with publication number CN115124807A discloses a high-resilience wear-resistant coated TPE material and its preparation method. The raw materials include SEBS, amine-modified SEBS, polyester polyurethane, metallocene olefin polymer, organic silicone powder, heavy calcium carbonate, compatibilizer, ultra-high molecular weight polyethylene, lubricant, antioxidant, filler oil and tackifying resin; the prepared TPE material has excellent performance, excellent resilience, excellent mechanical properties, good processing performance, strong coating ability, simple processing technology and the advantage of being recyclable. The present invention sets the outer sheath as a double-layer structure, the inner layer is set as a TPE inner sheath, and the outer layer is composed of an extruded nylon outer sheath; and the TPE inner sheath material and ratio are improved to meet the requirements of higher wear resistance, tensile strength and longer life of the charging cable.

[0034] In order to solve the problem that the thinner wire core inside the cable is easily damaged or even broken, the Chinese invention patent with publication number CN104299690A discloses a highly flexible electric vehicle charging pile cable, which adds copper foil and bulletproof wire to the signal power transmission core and the power transmission core to make the conductor softer and more resilient, which will increase the overall flexibility of the cable, and protect the signal line and the small square core line from being easily broken due to bending back and forth during the laying and use process. Another example is the Chinese invention patent with publication number CN112447315A, which discloses a high-power charging cable for new energy vehicles and a preparation method, which sets a copper wire braided layer and a sheath structure for shielding in the signal line to avoid the problem of broken cores of the signal line during mobile use.

[0035] All of the above technical solutions require changing the structure of the internal thin wire core to enhance the tensile strength of the wire core, which in turn increases the difficulty of producing the wire core.

[0036] The present invention sets the twist coefficient of the small-section core ≥ the twist coefficient of the large-section core to ensure that the large-section core is subjected to greater stress during bending, twisting and stretching, thereby reducing the possibility of damage to the small-section core due to excessive force. At the same time, the conductor elongation of the small-section core is set to be no less than the conductor elongation of the large-section core, ensuring that the small-section core has good flexibility and stretchability to adapt to changes in charging cables in complex use environments such as bending and twisting, and prevent the small-section core from breaking. The present invention solves the technical problem of the easy breakage of thin cores (such as signal lines) in existing charging pile cables without changing the structure of the thin cores.

[0037] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0038] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0039] Embodiment 1: like Figure 1 The wear-resistant charging cable 9 shown is composed of a cable core, a tape layer 6 and an outer sheath which are coaxially arranged from the inside to the outside, and the outer sheath is composed of a TPE inner sheath 7 and a nylon outer sheath 8 (i.e., the outer periphery of the cable core is tightly coated with a tape layer 6, the outer periphery of the tape layer 6 is tightly coated with a TPE inner sheath 7, and the outer periphery of the TPE inner sheath 7 is tightly coated with a nylon outer sheath 8). The tape layer 6 is arranged outside the cable core to tightly wrap the cable core together. The tape layer 6 can absorb and disperse the stress generated when the charging cable 9 is bent. When the stress is eliminated, the outer sheath drives the internal cable core to return to its original state, reducing the damage to the charging cable 9 caused by external stress, and effectively protecting the cable core inside the charging cable 9. At the same time, the tape layer 6 also has the function of preventing the cable core from sticking to the outer sheath.

[0040] The cable core is formed by concentrically twisting multiple wire core components of different cross-sections. The wire core components are two main power cores 3, one ground core 1, two auxiliary insulation cores 2, one control core component 4 and two signal core components 5. The two auxiliary insulation cores 2 are symmetrically distributed about the ground core 1, and the two signal cores 5 are symmetrically distributed about the control core 4. The signal core component 5 is a twisted pair structure, which is formed by twisting two signal cores and the outer surface is covered with a protective inner sheath. The control core component 4 is formed by twisting multiple control cores in a concentric manner and the outer surface is covered with a protective inner sheath. In this embodiment, the protective inner sheath is made of thermoplastic elastomer (TPE).

[0041] The cross-sections of the wire cores from small to large are respectively the control wire core, the signal wire core, the insulated wire core 2, the ground wire core 1, and the power main wire core 3; in the charging cable, since the cross-sections of the power main wire core 3 and the signal wire core and the control wire core are too different, when bent under the same surface tension, the signal wire core and the control wire core are often more prone to wire breakage, resulting in communication blockage during the charging process, failure of the charging process control, causing a series of problems such as overcharging, insufficient power supply, failure of the protective device, etc., thereby causing safety accidents during the charging process.

[0042] In order to solve the above problem, the twist coefficient of the small-section core is ≥ the twist coefficient of the large-section core. This setting means that during the twisting process, the small-section core has a larger offset relative to the central axis, and the large-section core will first bear the stress of pulling, twisting, and bending of the cable as a whole. This helps to evenly distribute the stresses borne by each cable during operation (the purpose of large-section cores bearing large stresses and small-section cores bearing small stresses), reduce the possibility of small-section cores being damaged due to excessive force, and improve the overall performance and service life of the charging cable 9.

[0043] In this embodiment, the ratio of the pitch of the signal wire core component 5 to its outer diameter is 6 times, the ratio of the pitch of the control wire core component 4 to its outer diameter is 6 times; the ratio of the pitch of the insulating wire core 2 to its own outer diameter is 8 times; the ratio of the pitch to the outer diameter of the ground wire core 1 and the power main wire core 3 is 12 times.

[0044] Of course, in other embodiments, it can also be set as: the ratio of the pitch of the signal core component 5 to its outer diameter is 7 times or 8 times, the ratio of the pitch of the control core component 4 to its outer diameter is 7 times or 8 times; the ratio of the pitch of the insulating core 2 to its own outer diameter is 9 times or 10 times; the ratio of the pitch to the outer diameter of the ground core 1 and the power main core 3 is 13 times, 14 times, 15 times or 16 times.

[0045] The conductor elongation of the wire core is inversely proportional to the cross-section of the wire core, and the conductor elongation of the small cross-section wire core is not less than the conductor elongation of the large cross-section wire core. By making the small cross-section wire core have better flexibility and stretchability, it can adapt to the changes of the charging cable 9 in complex use environments such as bending and twisting, and prevent the small cross-section wire core from breaking.

[0046] The wrapping layer 6 is a non-woven fabric layer.

[0047] In other embodiments, a flame retardant filling layer is further provided between the cable core and the tape layer 6 to ensure the roundness of the cable and prevent the cable surface from being uneven. That is, when the cable core is cabled, the flame retardant filling layer is used for filling to make the outer circumference of the cable core round and tight; the outer circumference of the flame retardant filling layer is tightly coated with the tape layer 6. The provision of the flame retardant filling layer makes the charging cable 9 structure more compact, and in the case of twisting of the charging cable 9, the overall twisting and knotting phenomenon is prevented, and the charging cable 9 recovers faster when the external force disappears.

[0048] The outer sheath adopts a double-layer structure. The TPE inner sheath 7 is made of thermoplastic elastomer (TPE) material to ensure the overall bending and torsion toughness requirements of the cable; the nylon outer sheath 8 is made of wear-resistant, high-finish nylon material to ensure that the outer surface of the cable is wear-resistant and dust-free, and has anti-aging functions.

[0049] The TPE inner sheath 7 comprises the following components in parts by weight: 30 parts of SEBS thermoplastic elastomer, 0.5 parts of polyphenylene ether, 19 parts of 150N base oil, 7.7 parts of heavy calcium powder, 2.8 parts of talc, 2 parts of silicone powder, 0.7 parts of 900cs silicone oil, 9 parts of magnesium powder, 4 parts of POE-3000-4 carbon, 3.8 parts of compatibilizer, 2.8 parts of masterbatch, 0.2 parts of activator, 0.2 parts of antioxidant, and 0.1 parts of erucamide.

[0050] In this embodiment, the activator is stearic acid. Of course, in other embodiments, the activator may also be zinc oxide or calcium oxide, or several of stearic acid, zinc oxide and calcium oxide.

[0051] The nylon outer sheath 8 comprises the following components in parts by weight: 65 parts of PA66, 30 parts of carbon fiber, 10 parts of wear-resistant agent, 0.5 parts of antioxidant, and 1 part of lubricant.

[0052] The production method of the charging cable 9 comprises the following steps: S1. Place two main power cores 3 in the middle, place the ground core 1 and the control core 4 on the upper and lower sides of the main power core 3, respectively, place two auxiliary insulating cores 2 on the left and right sides of the ground core 1, and place two signal core components 5 on the left and right sides of the control core component 4, respectively, and use a cabling machine to twist them into cables in a concentric manner to obtain a cable core; S2, wrapping the outer side of the cable core with non-woven fabric to form a wrapping layer 6; S3, making TPE inner protective layer 7 raw materials - TPE particles: S31, SEBS thermoplastic elastomer, polyphenylene ether, 150N base oil, heavy calcium powder, talcum powder, silicone powder, 900cs silicone oil, magnesium powder, POE-3000-4 carbon, compatibilizer, masterbatch, activator, antioxidant, erucic acid amide are weighed and mixed according to the ratio, put into a fully enclosed high-stirring barrel and stir evenly, control the temperature at 80℃±5℃, and stir for 20 minutes; S32, the raw materials after mixing and mixing are sent to the twin-screw extruder of the melting equipment for further melting. The twin-screw mixing and extrusion temperature is set as follows: 185℃ for the first section, 195℃ for the second section, 215℃ for the third section, 220℃ for the fourth section, and 190℃ for the die. Under the action of shear force, the raw materials gradually melt and mix evenly to form a uniform melt; S33, the melt after smelting enters the plasticization stage, the extrusion plasticization temperature is 190~195℃, the speed of the twin screw is controlled at 450~480 rpm, and the pressure of the die is controlled at 5~6Mpa to further plasticize the melt; S34, cooling the plasticized material through a cooling system until it reaches room temperature, so that the material gradually solidifies and maintains its shape; S35, the cooled material is sent to a granulator for cutting, granulation and screening; the granulator cuts the material into TPE particles of uniform size for subsequent processing and use; the granulated particles are screened by a screening device to remove unqualified particles and impurities to ensure the purity and quality of the TPE particles; S4. Extruding the TPE particles obtained by the extruder on the outside of the tape layer 6 to form a TPE inner protective layer 7, and extruding a nylon outer protective layer 8 on the outside of the TPE inner protective layer 7, thereby obtaining a charging cable 9.

[0053] In step S33, the plasticizing effect of TPE is ensured by the rotation speed of the twin screws, and the uniformity of the amount of glue discharged in the melt flow state is controlled by the extrusion plasticizing temperature.

[0054] This embodiment also provides a charging pile, including the charging cable 9 as described above, a winding wheel 10 and a charging pile body, the winding wire is fixedly arranged on one side of the charging pile body, the winding wheel 10 is used to store the charging cable 9, and the charging cable 9 is connected between the charging pile body and the gun head.

[0055] Preferably, the winding wheel 10 has a self-winding function, and the charging cable 9 and the gun head can freely retract and rotate with the rotating shaft 11 as the center, ensuring that the charging cable 9 can be retracted freely and the gun line does not fall off.

[0056] In other embodiments, Figure 3 As shown, a cleaning elastic body 12 is provided on the reel 10. The cleaning elastic body 12 is used to passively wipe the debris, dust, water droplets, etc. on the surface of the cable body when the charging cable 9 rotates. The cleaning elastic body 12 can be a sponge, a microfiber cloth, a brush, or other elastic material with a cleaning function to reduce the accumulation of dirt and dust on the charging cable 9, improve the cleanliness of the surface of the charging cable 9, reduce the friction between the charging cables 9, and reduce the wear of the charging cable 9. And the cleaning elastic body 12 can automatically clean the cable surface as the cable is reeled, without manual intervention.

[0057] In this embodiment, if Figure 2 As shown, the charging pile is also provided with a dust cover 13, which is provided on the winding wheel 10 and has an opening for the charging cable 9 to pass through when winding. Figure 3 As shown, the cleaning elastic body 12 is arranged inside the dust cover 13, and a filler 14 is also installed on the dust cover 13. The filler 14 can contain disinfectant or cleaning solution. The filler 14 is connected to the cleaning elastic body 12 and is used to provide disinfectant or cleaning solution to the cleaning elastic body 12 to maintain the antiviral performance (especially anti-mildew performance) or cleanliness of the charging cable 9. In addition, the filler 14 can conveniently replenish the disinfectant or cleaning solution to ensure the effect of the cleaning elastic body 12.

[0058] Embodiment 2: The main difference between it and Example 1 is: In this embodiment, the TPE inner protective layer 7 comprises the following components in parts by weight: 30.5 parts of SEBS thermoplastic elastomer, 0.5 parts of polyphenylene ether, 19.5 parts of 150N base oil, 7.7 parts of heavy calcium powder, 2.85 parts of talc, 2.5 parts of silicone powder, 0.75 parts of 900cs silicone oil, 9.5 parts of magnesium powder, 4.5 parts of POE-3000-4 carbon, 3.85 parts of compatibilizer, 2.85 parts of masterbatch, 0.3 parts of activator, 0.4 parts of antioxidant, and 0.2 parts of erucamide.

[0059] Embodiment 3: The main difference between it and Example 1 is: In this embodiment, the TPE inner protective layer 7 comprises the following components in parts by weight: 31 parts of SEBS thermoplastic elastomer, 0.5 parts of polyphenylene ether, 20 parts of 150N base oil, 7.7 parts of heavy calcium powder, 2.9 parts of talc, 3 parts of silicone powder, 0.8 parts of 900cs silicone oil, 10 parts of magnesium powder, 5 parts of POE-3000-4 carbon, 3.9 parts of compatibilizer, 2.9 parts of masterbatch, 0.5 parts of activator, 0.6 parts of antioxidant, and 0.4 parts of erucamide.

[0060] The only difference between Comparative Example 1 and Example 1 is that the TPE inner protective layer 7 does not contain POE-3000-4 carbon.

[0061] The only difference between Comparative Example 2 and Example 1 is that silicone powder and 900 cs silicone oil are not added to the TPE inner protective layer 7 .

[0062] The main performance index comparison table of Examples 1-3 and Comparative Examples 1-2 is shown in the following table: The tensile strength and elongation at break of the cable were tested in accordance with GB / T 2951.11-2008, and the abrasion performance of the cable was tested in accordance with GB / T 3960-2016. The test results are shown in the following table:

[0063] According to the data of Examples 1-3 and Comparative Example 1, it can be seen that the TPE inner protective layer 7 significantly improves the toughness of the charging cable 9 by adding POE-3000-4 carbon.

[0064] According to the data of Examples 1-3 and Comparative Example 2, it can be seen that the TPE inner protective layer 7 significantly improves the wear resistance of the charging cable 9 by adding silicone powder and 900cs silicone oil.

[0065] It can be seen from the above table that the charging cable 9 prepared according to Examples 1-3 of the present invention has excellent resilience, tensile strength and wear resistance.

Claims

1. A wear-resistant charging cable, characterized in that: The invention comprises a cable core, a tape layer (6) and an outer sheath which are coaxially arranged in sequence from the inside to the outside, wherein the outer sheath is composed of a TPE inner sheath (7) and a nylon outer sheath (8); the TPE inner sheath (7) comprises the following components in the following weight proportions: SEBS thermoplastic elastomer 30-31 parts, polyphenylene ether 0.5 parts, 150N base oil 19-20 parts, heavy calcium powder 7.7 parts, talc 2.8-2.9 parts, silicone powder 2-3 parts, 900cs silicone oil 0.7-0.8 parts, magnesium powder 9-10 parts, POE-3000-4 carbon 4-5 parts, compatibilizer 3.8-3.9 parts, masterbatch 2.8-2.9 parts, activator 0.2-0.5 parts, antioxidant 0.2-0.6 parts, erucamide 0.1-0.4 parts.

2. The wear-resistant charging cable according to claim 1, characterized in that: The cable core is formed by concentrically twisting a plurality of wire core components with different cross-sections, wherein the wire core components are composed of two main power supply wire cores (3), one ground wire core (1), two auxiliary insulating wire cores (2), one control wire core component (4) and two signal wire core groups (5).

3. A wear-resistant charging cable according to claim 2, characterized in that: The control wire core component (4) is formed by twisting a plurality of control wire cores in a concentric manner and the outer surface is covered with a protective inner sheath.

4. The wear-resistant charging cable according to claim 2, characterized in that: The signal wire core component (5) is formed by twisting two signal wire cores and the outer surface is covered with a protective inner sheath.

5. The wear-resistant charging cable according to claim 4, characterized in that: The wire core cross-sections are, from small to large, a control wire core, a signal wire core, an insulation wire core (2), a ground wire core (1), and a power supply main wire core (3); the twist coefficient of the wire core with a small cross-section is greater than or equal to the twist coefficient of the wire core with a large cross-section.

6. The wear-resistant charging cable according to claim 5, characterized in that: The conductor elongation of the core is inversely proportional to the cross-section of the core, and the conductor elongation of the core with a small cross-section is not less than the conductor elongation of the core with a large cross-section.

7. The wear-resistant charging cable according to claim 6, characterized in that: The ratio of the pitch of the signal wire core component (5) and the control wire core component (4) to their respective outer diameters is 6-8 times; the ratio of the pitch of the insulating wire core (2) to its own outer diameter is 8-10 times; and the ratio of the pitch to the outer diameter of the ground wire core (1) and the power main wire core (3) is 12-16 times.

8. A charging pile, characterized in that: It comprises a charging cable (9) as described in any one of claims 1 to 7, a winding wheel (10) and a charging pile body, wherein the winding wheel (10) is fixedly arranged on one side of the charging pile body, and the winding wheel (10) is used to store the charging cable (9).

9. A charging pile as claimed in claim 8, characterized in that: The winding wheel (10) is provided with a cleaning elastic body (12).

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