Anti-interference low-voltage multi-layer cable and preparation process thereof

Abstract

The invention relates to the technical field of cable preparation, in particular to an anti-interference low-voltage multi-layer cable and a preparation process thereof. The preparation process of the anti-interference low-voltage multi-layer cable comprises the following steps: twisting a silver-plated copper conductor and aramid yarn around a tight-buffered optical fiber center unit to obtain a cable core body; a shielding layer is wrapped outside the cable core body; weaving a drainage wire and a silver-plated copper wire outside the cable core wrapped by the shielding layer to obtain a double-layer shielding cable; and extruding the raw material of the insulating sheath, performing injection molding to wrap the raw material outside the cable core with the shielding layer, and performing electron irradiation crosslinking to obtain the anti-interference low-voltage multi-layer cable. According to the preparation process of the cable, high integration of functions and structural reinforcement are achieved, the silver-plated copper conductor and the high-strength aramid yarn are twisted together, the tensile strength and the mechanical shock resistance of the cable core are greatly enhanced while excellent conductivity is provided, and the service life of the cable core is prolonged. Therefore, complex installation stress and tensile load in long-term operation can be borne.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable preparation, in particular to an anti-interference low-voltage multi-layer cable and a preparation process thereof. BACKGROUND

[0002] Low-voltage cable generally refers to a cable used for transmitting and distributing electric energy with an alternating voltage of 1kV and below or a direct voltage of 1.5kV and below. It is the most common and largest used cable type in the power system, and is widely used in power transmission from the power grid terminal to various fields of our daily life and industrial production. The traditional low-voltage cable is mainly a power transmission cable or a signal transmission cable with single function, and the tensile strength thereof mainly depends on the metal conductor itself, so the mechanical strength is limited. In the occasion requiring frequent movement, dragging or long-distance vertical laying, the cable is easily damaged due to excessive mechanical stress, thereby affecting the power supply safety and system reliability. In addition, in terms of electromagnetic compatibility, the increasingly complex electromagnetic environment puts high requirements on the shielding effectiveness of the cable. The existing low-voltage cable generally adopts a woven shielding layer or a wrapping shielding layer. The single type of shielding structure is often difficult to cope with the electromagnetic interference in a wide frequency band, and the woven shielding layer has inherent gaps, resulting in poor shielding effect on high-frequency interference. The single wrapping film shielding layer has poor mechanical strength and is inconvenient to ground.

[0003] Meanwhile, the polypropylene sheath layer material of the low-voltage cable has the problem of insufficient dispersion uniformity, which may cause performance degradation of the sheath layer, such as insulation performance fluctuation and wear resistance reduction. In view of the above problems, the present application provides an anti-interference low-voltage multi-layer cable and a preparation process thereof. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide an anti-interference low-voltage multi-layer cable and a preparation process thereof.

[0005] A preparation process of an anti-interference low-voltage multi-layer cable, specifically comprising the following steps: Place a tight-fitting optical fiber as a center unit, twist the silver-plated copper conductor and the aramid yarn through a high-speed twisting machine at a speed of 1500-1800rpm, and twist them together around the center unit, wherein the twisted wire diameter is 0.04-1.8mm, and the twisted cross section is 3-6.5mm 2 to obtain a cable core; Install the shielding layer film tape reel to the high-speed wrapping machine, adjust the wrapping pitch of the wrapping machine to 20-50mm, and the wrapping angle to 40°-60°, and wrap a layer of shielding layer outside the cable core; Before the braiding process starts, a drainage wire is placed parallel to the cable core body which has been wrapped with a shielding layer, then a silver-plated copper wire coil is installed on a high-speed braiding machine, the cable core body integrated with the drainage wire is passed through the center of the braiding machine, the braiding pitch of the braiding machine is adjusted to 20-40 mm, the braiding angle is adjusted to 50°-70°, and the spindle speed is adjusted to 800-1400 rpm, a double-layer shielding layer is formed, and a double-layer shielding cable is obtained; The 2-4 mass parts of the insulation sheath raw material, 3-5 mass parts of the composite lubricant, 2-4 mass parts of the plasticizer epoxidized soybean oil, and 20-40 mass parts of polypropylene are extruded at 190-200℃ through a double-screw extruder, the extrudate is first cooled at 60-65℃, then cooled in a 30-45℃ water tank, pelletized, and then the obtained pellets are heated and injection molded at 170-210℃ using an injection molding machine, and after cooling, a polypropylene insulation cable protective sheath is prepared, which is wrapped outside the cable core body with the completed shielding layer and cooled and shaped, and then the polypropylene insulation cable protective sheath is subjected to electron irradiation crosslinking at an irradiation dose of 100-300 kGy for 10-15 min to form a sheath layer, and an anti-interference low-voltage multi-layer cable is obtained.

[0006] Further, the shielding layer film is specifically an aluminum-plated polyester film with a thickness of 12-50 μm or a nano-ceramic coated polyimide film.

[0007] Further, the drainage wire is specifically a soft annealed tinned copper wire with a diameter of 0.3-0.5 mm.

[0008] Further, the pellet size is 3mmX3mm or 4mmX4mm.

[0009] Further, the preparation process of the insulation sheath raw material is specifically as follows: 3-6 mass parts of β-cyclodextrin are mixed with 1-2 mass parts of graphene oxide, ball-milled for 1-2 hours, the ball-milled product is transferred to 100-110 mass parts of deionized water, dispersed by ultrasonic action, then centrifuged, the solid precipitate is collected, and the obtained solid precipitate is dried at 70-75℃ for 24-25 hours, and then ground to obtain a ground powder. The alkali solution and the Cu / Zn / Al mixed salt solution are added into the grinding powder, the molar ratio of Cu, Zn and Al in the Cu / Zn / Al mixed salt solution is 2:1:1, the mixture is stirred at a rotating speed of 500-600 rpm for 30-35 minutes, and is subjected to ultrasonic dispersion, 5-8 parts by mass of the additive is added, and the mixture is reacted at a rotating speed of 300-400 rpm at 60-80 DEG C for 2-3 hours, and is subjected to nitrogen treatment at 240-250 DEG C for 2-2.5 hours, the product is subjected to suction filtration, washing and drying, the dried product is subjected to high temperature treatment at 400-420 DEG C under nitrogen atmosphere for 1-1.5 hours, and is subjected to tabletting and granulation to obtain the insulating sheath raw material.

[0010] Further, the preparation process of the composite lubricant is specifically as follows: The liquid paraffin 4-8 parts by mass, cottonseed oil 1-3 parts by mass, white oil 1-1.5 parts by mass and gum arabic 2-3 parts by mass are mixed, and the mixture is stirred at a rotating speed of 300-350 rpm at 50-60 DEG C for 10-15 minutes to prepare a paraffin emulsion, the paraffin emulsion 8-10 parts by mass, silicon lubricating grease 4-5 parts by mass and stearic acid 1-3 parts by mass are added into a stirring ball mill, and the silicon dioxide 1-1.5 parts by mass and the stabilizer polyvinyl alcohol 0.5-1.5 parts by mass are further added, and the mixture is stirred at a rotating speed of 800-900 rpm for 20-25 minutes, and the obtained product is the composite lubricant.

[0011] Further, the additive is specifically prepared by mixing formamide and glycerol at a volume ratio of 1:3.

[0012] Further, the alkali solution is prepared by mixing sodium carbonate solution and sodium hydroxide solution at a volume ratio of 1:(1-2).

[0013] An anti-interference low-voltage multi-layer cable is prepared by the preparation process of the anti-interference low-voltage multi-layer cable.

[0014] Compared with the prior art, the present application has at least the following beneficial effects: 1. The cable preparation process of the application realizes high integration of functions and structural reinforcement, taking tight-fitting optical fibers as the central unit, and creatively integrating data transmission and power transmission into one, while plating silver copper conductors and high-strength aramid yarns are twisted together to provide excellent electrical conductivity while greatly enhancing the tensile strength and mechanical impact resistance of the cable core, enabling it to withstand complex installation stress and long-term running tension load; and by adopting a composite structure of double-layer shielding of wrapping film and metal braid, the two shielding methods are reasonably combined, the inner layer of wrapping film provides a high-coverage shielding layer, effectively resisting high-frequency electromagnetic interference, and the outer layer of metal braid provides a low-impedance low-frequency protection, while also bearing a certain mechanical protection capability, both of which work together to ensure stable and high-level shielding effect in a wide frequency range from low frequency to high frequency, thereby effectively improving the anti-interference ability and stability of the cable.

[0015] 2. The application forms a hydrotalcite-derived metal oxide composite by treating Cu / Zn / Al mixed salt with an alkaline solution prepared from sodium carbonate and sodium hydroxide and calcining, in which process, at 60 DEG C low-temperature reaction and 240 DEG C medium-temperature solidification stage, the beta-cyclodextrin glycosidic bond is not broken, and the ring cavity structure and surface hydroxyl retention rate are high, which enables the beta-cyclodextrin to anchor Cu / Zn / Al ions between the graphene oxide layers through the dual action of cavity encapsulation and hydroxyl complexation, realizing the function of intercalated framework, formamide and glycerol are added in advance and participate in the complexation reaction at 60 DEG C, formamide is inserted between the graphene oxide layers to weaken the electrostatic attraction, and the polyhydroxyl groups of glycerol form a hydrogen bond network with the beta-cyclodextrin to fix the metal-support composite structure and inhibit the interlayer stacking, and nitrogen treatment at 40 DEG C for 2 hours dehydrates the metal hydroxide to form a hydrotalcite-derived phase with moderate crystallinity, which embeds the beta-cyclodextrin / graphene oxide framework between the layers to form a stable composite structure, thereby improving the thermal stability of the filler.

[0016] 3. The application applies a composite lubricant prepared by compounding paraffin emulsion oil, silicon lubricating grease and stearic acid to a polypropylene system. The paraffin emulsion oil provides basic lubrication, reduces melt viscosity and improves extrusion processability; the polarity of stearic acid and paraffin emulsion oil is complementary, and they synergistically realize internal and external lubrication balance to effectively reduce shear stress and interfacial friction; the silicon lubricating grease is further compounded with stearic acid and paraffin emulsion oil to form a high-efficiency protective layer, which significantly reduces the friction coefficient and improves the overall lubrication effect. The system makes the surface of the cable protective sleeve smoother, thereby enhancing its wear resistance and insulation performance.

[0017] 4、The application forms stable paraffin emulsion by stirring liquid paraffin, cottonseed oil, white oil and gum arabic under specific conditions; gum arabic as an emulsifier co-emulsifies liquid paraffin and cottonseed oil, and constructs a uniform composite lubricating system; cottonseed oil and white oil have excellent biodegradability, avoiding persistent pollution to soil and water, and outstanding environmental friendliness. Liquid paraffin, white oil and gum arabic are all low-toxic or non-toxic substances with high safety; in cable production, this kind of lubricant can replace traditional chemical lubricants, significantly reducing environmental pollution, and meeting green manufacturing standards. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable a person skilled in the relevant art to implement and use the present disclosure.

[0019] Figure 1 A structure diagram of an anti-interference low-voltage multi-layer cable used in an embodiment of the present application. DETAILED DESCRIPTION

[0020] The anti-interference low-voltage multi-layer cable and the preparation process thereof provided by the present application will be described in detail below in combination with the drawings and specific embodiments. It should be noted that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and other alternative ways can also be used by those skilled in the art to implement some known technologies; and the drawings are only used to more specifically describe the embodiments, and are not intended to specifically limit the present application.

[0021] Embodiment 1: A preparation process of an anti-interference low-voltage multi-layer cable, specifically comprising the following steps: Place a tight-fitting optical fiber as a center unit, twist the silver-plated copper conductor and aramid yarn through a high-speed twisting machine at a speed of 1500 rpm, and twist them together around the center unit, wherein the twisted wire diameter is 0.04 mm, and the twisted cross section is 3 mm 2 to obtain a cable core; Install a shielding layer film tape reel on a high-speed wrapping machine, and the shielding layer film is specifically an aluminum-plated polyester film with a thickness of 20 μm, adjust the wrapping pitch of the wrapping machine to 20 mm, and the wrapping angle to 40°, and wrap a layer of shielding layer outside the cable core; Before the braiding process starts, a drainage wire is placed parallel to the cable core body which has been wrapped with a shielding layer, the drainage wire is specifically a soft annealed tinned copper wire with a diameter of 0.3 mm, then a silver plated copper wire coil is installed on a high-speed braiding machine, the cable core body integrated with the drainage wire is passed through the center of the braiding machine, the braiding pitch of the braiding machine is adjusted to 20 mm, the braiding angle is adjusted to 50°, and the spindle speed is adjusted to 800 rpm, a double-layer shielding layer is formed, and a double-layer shielding cable is obtained; The 2 parts by mass of the insulation sheath raw material, 3 parts by mass of the composite lubricant, 2 parts by mass of the plasticizer epoxidized soybean oil, and 20 parts by mass of polypropylene are extruded at 190°C through a double-screw extruder. The extrudate is first cooled at 60°C, then cooled in a 30°C water tank, pelletized, and the pellet size is 3mmX3mm. Then the obtained pellets are heated and injection molded at 170°C using an injection molding machine. After cooling, a polypropylene insulation cable protective sleeve is obtained, which is wrapped around the cable core body with a completed shielding layer and cooled and shaped. Then the polypropylene insulation cable protective sleeve is subjected to electron irradiation crosslinking with an irradiation dose of 100 kGy for 10 minutes to form a sheath layer, and an anti-interference low-voltage multi-layer cable is obtained.

[0022] The preparation process of the insulation sheath raw material is specifically as follows: Mix 3 parts by mass of β-cyclodextrin with 1 part by mass of graphene oxide, ball mill for 1 hour, transfer the ball milled product to 100 parts by mass of deionized water, disperse by ultrasonic action, then centrifuge, collect the solid precipitate, dry the obtained solid precipitate at 70°C for 24 hours, grind the dried material to obtain a ground powder; Add 2 parts by mass of alkali solution and 4 parts by mass of Cu / Zn / Al mixed salt solution to the ground powder, stir and mix at a speed of 500 revolutions per minute for 30 minutes, and ultrasonic dispersion is performed. Add 5 parts by mass of an additive, react at a speed of 300 revolutions per minute at 60°C for 2 hours, and then treat with nitrogen at 240°C for 2 hours. The product is suction filtered, washed and dried. The dried product is placed in a tube furnace and treated at 400°C for 1 hour under a nitrogen atmosphere. The product is tableted and granulated to obtain the insulation sheath raw material; The additive is specifically prepared by mixing formamide and glycerol in a volume ratio of 1:3. In the Cu / Zn / Al mixed salt solution, the molar ratio of Cu, Zn and Al is 2:1:1.

[0023] The preparation process of the composite lubricant is specifically as follows: Mix 4 parts by mass of liquid paraffin, 1 part by mass of cottonseed oil, 1 part by mass of white oil, and 2 parts by mass of gum arabic, stir at a speed of 300 revolutions per minute at 50°C for 10 minutes, and prepare a paraffin emulsion; The compound lubricant is obtained by adding 8 parts by mass of paraffin oil, 4 parts by mass of silicon lubricating grease and 1 part by mass of stearic acid into a stirring ball mill, then adding 1 part by mass of silicon dioxide and 0.5 part by mass of stabilizer polyvinyl alcohol, and stirring and mixing at a speed of 800 revolutions per minute for 20 minutes.

[0024] Example 2: A preparation process of an anti-interference low-voltage multi-layer cable, specifically comprising the following steps: Place a tight-fitting optical fiber as a central unit, twist the silver-plated copper conductor and aramid yarn together at a speed of 1600 rpm through a high-speed twisting machine, and twist them together around the central unit, wherein the twisted wire diameter is 1 mm and the twisted cross section is 5 mm 2 to obtain a cable core; Install a shielding layer film tape reel on a high-speed wrapping machine, and the shielding layer film is specifically an aluminum-plated polyester film with a thickness of 20 microns, adjust the wrapping pitch of the wrapping machine to 40 mm and the wrapping angle to 50°, and wrap a layer of shielding layer on the cable core; Before the braiding process starts, place a drainage wire parallel to the cable core that has been wrapped with the shielding layer, and the drainage wire is specifically a soft annealed tinned copper wire with a diameter of 0.4 mm, then install a silver-plated copper wire reel on a high-speed braiding machine, pass the cable core integrated with the drainage wire through the center of the braiding machine, adjust the braiding pitch of the braiding machine to 30 mm, the braiding angle to 60° and the spindle speed to 1100 rpm, form a double-layer shielding layer, and obtain a double-layer shielding cable; Extrude 3 parts by mass of insulation sheath raw material, 4 parts by mass of compound lubricant, 3 parts by mass of plasticizer epoxidized soybean oil and 30 parts by mass of polypropylene through a double-screw extruder at 195°C, first cool the extrudate through a 62°C cooling water tank, then cool it through a 38°C water tank, cut it into particles, the particle size is 3mmX3mm, then heat and injection mold the obtained particles using an injection molding machine at 190°C, and after cooling, obtain a polypropylene insulation cable protective sleeve, wrap it outside the cable core that has completed the shielding layer, and cool and shape it, then perform electronic irradiation crosslinking on the polypropylene insulation cable protective sleeve using an electronic irradiation dose of 200kGy for 12 minutes to form a sheath layer, and obtain an anti-interference low-voltage multi-layer cable.

[0025] The preparation process of the insulation sheath raw material is specifically as follows: Mix 3 parts by mass of beta-cyclodextrin with 1 part by mass of graphene oxide, ball mill for 2 hours, transfer the ball-milled product to 100 parts by mass of deionized water, disperse by ultrasonic action, then perform centrifugal separation, collect the solid precipitate, dry the obtained solid precipitate at 75°C for 25 hours, and grind the dried material to obtain a ground powder. Add 2 parts by mass of alkaline solution and 4 parts by mass of Cu / Zn / Al mixed salt solution to the ground powder, stir and mix at 600 rpm for 35 minutes, and then perform ultrasonic dispersion. Add 5 parts by mass of additive, react at 400 rpm at 80°C for 3 hours, and then treat with nitrogen at 250°C for 2.5 hours. Filter, wash and dry the product, place the dried product in a tube furnace and treat at 420°C for 1.5 hours under nitrogen atmosphere, and then compress and granulate to obtain the insulating sheath raw material. Specifically, the additive is prepared by mixing formamide and glycerol in a volume ratio of 1:3, and the molar ratio of Cu, Zn and Al in the Cu / Zn / Al mixed salt solution is 2:1:1.

[0026] The specific preparation process of the composite lubricant is as follows: Mix 4 parts by weight of liquid paraffin, 1 part by weight of cottonseed oil, 1 part by weight of white oil and 2 parts by weight of gum arabic, and stir at 350 rpm for 15 minutes at 60°C to obtain paraffin emulsion. Add 8 parts by weight of paraffin emulsion, 4 parts by weight of silicone grease and 1 part by weight of stearic acid to a stirred ball mill, then add 1 part by weight of silica and 0.5 parts by weight of polyvinyl alcohol stabilizer. Stir and mix at 900 rpm for 25 minutes. The resulting product is the composite lubricant.

[0027] Example 3: A manufacturing process for an anti-interference low-voltage multilayer cable specifically includes the following steps: A tight-buffered optical fiber is placed as the central unit. A silver-plated copper conductor and aramid yarn are twisted together around the central unit using a high-speed stranding machine at 1800 rpm. The stranded wire diameter is 1.8 mm, and the stranded cross-section is 6.5 mm². 2 The cable core is obtained; The shielding film reel is installed onto the high-speed wrapping machine. The shielding film is a 20μm thick aluminized polyester film. The wrapping pitch of the wrapping machine is adjusted to 50mm and the wrapping angle is 60°. A shielding layer is wrapped around the outside of the cable core. Before the braiding process begins, a lead wire is placed parallel to the cable core that has already been wrapped with a shield. The lead wire is a soft tin-plated copper wire with a diameter of 0.5mm that has undergone annealing. Then, the silver-plated copper wire spool is installed on a high-speed braiding machine. The cable core with the lead wire integrated is passed through the center of the braiding machine. The braiding pitch of the braiding machine is adjusted to 40mm, the braiding angle to 70°, and the spindle speed to 1400rpm to form a double shielding layer, thus obtaining a double-shielded cable. Four parts by weight of insulating sheath raw material, five parts by weight of composite lubricant, four parts by weight of plasticizer epoxidized soybean oil, and 40 parts by weight of polypropylene were extruded at 200°C using a twin-screw extruder. The extrudate was first cooled to 65°C, then cooled in a 45°C water bath, and granulated to a size of 4mm x 4mm. The resulting granules were then injection molded at 210°C using an injection molding machine. After cooling, a polypropylene insulated cable protective sheath was obtained, which was wrapped around the cable core with the completed shielding layer and cooled to set. The polypropylene insulated cable protective sheath was then subjected to electron cross-linking with an irradiation dose of 300kGy for 15 minutes to form a sheath layer, resulting in an anti-interference low-voltage multilayer cable.

[0028] The specific preparation process of the insulating sheath material is as follows: Six parts by mass of β-cyclodextrin and two parts by mass of graphene oxide were mixed and ball-milled for 1 hour. The ball-milled product was transferred to 110 parts by mass of deionized water and dispersed by ultrasonication. Then, centrifugation was performed to collect the solid precipitate. The obtained solid precipitate was dried at 70°C for 24 hours. After drying, the material was ground to obtain ground powder. Add 3 parts by mass of alkaline solution and 5 parts by mass of Cu / Zn / Al mixed salt solution to the ground powder, stir and mix at 500 rpm for 30 minutes, and then perform ultrasonic dispersion. Add 8 parts by mass of additive, react at 300 rpm at 60°C for 2 hours, and then treat with nitrogen at 240°C for 2 hours. Filter, wash and dry the product, place the dried product in a tube furnace and treat at 400°C for 1 hour under nitrogen atmosphere, and then compress and granulate to obtain the insulating sheath raw material. Specifically, the additive is prepared by mixing formamide and glycerol in a volume ratio of 1:3, and the molar ratio of Cu, Zn and Al in the Cu / Zn / Al mixed salt solution is 2:1:1.

[0029] The specific preparation process of the composite lubricant is as follows: Mix 8 parts by weight of liquid paraffin, 3 parts by weight of cottonseed oil, 1.5 parts by weight of white oil and 3 parts by weight of gum arabic, and stir at 300 rpm for 10 minutes at 50°C to obtain paraffin emulsion. Add 10 parts by weight of paraffin emulsion, 5 parts by weight of silicone grease and 3 parts by weight of stearic acid to a stirred ball mill, then add 1.5 parts by weight of silica and 1.5 parts by weight of polyvinyl alcohol as a stabilizer, and stir and mix at 800 rpm for 20 minutes. The resulting product is the composite lubricant.

[0030] Comparative Example 1: Comparative Example 1 is a commercially available polypropylene insulated cable protective sleeve. The commercially available polypropylene insulated cable protective sleeve is wrapped around the outer layer of the cable core bundled with optical fiber to produce an anti-interference low-voltage multilayer cable, referred to as Comparative Example 1.

[0031] Comparative Example 2: Compared with Example 1, Comparative Example 2 differs in that graphene oxide is not added, while the other steps remain unchanged. The anti-interference low-voltage multilayer cable prepared is referred to as Comparative Example 2.

[0032] Comparative Example 3: Compared with Example 1, Comparative Example 3 differs in that no additives are added, but glycerol is replaced with additives. The remaining steps remain the same, and the anti-interference low-voltage multilayer cable prepared is referred to as Comparative Example 3.

[0033] Comparative Example 4: Compared with Example 1, the difference of Comparative Example 4 is that no additive is added in step S3, but the additive is replaced with formamide. The other steps remain the same. The anti-interference low-voltage multilayer cable prepared is referred to as Comparative Example 4.

[0034] Comparative Example 5: Compared with Example 1, Comparative Example 5 differs in that no silicone grease is added, while the other steps remain the same. The anti-interference low-voltage multilayer cable prepared is referred to as Comparative Example 5.

[0035] Comparative Example 6: Compared with Example 1, Comparative Example 6 differs in that stearic acid is not added, while the other steps remain unchanged. The anti-interference low-voltage multilayer cable prepared is referred to as Comparative Example 6.

[0036] Comparative Example 7: Compared with Example 1, Comparative Example 7 differs in that paraffin emulsion is not added, but instead the industrial lubricant chlorinated paraffin-42 is replaced. The other steps remain the same, and the prepared anti-interference low-voltage multilayer cable is referred to as Comparative Example 7.

[0037] The surface wear resistance of Examples 1-3 and Comparative Examples 1-4 was tested using a friction and wear testing machine. The speed of the friction and wear testing machine was set to 400 rpm, the load to 100 N, and the test time to 1 hour. The wear amount was measured, and the experimental results are shown in Table 1.

[0038] Table 1

[0039] The volume resistivity of Examples 1-3, Comparative Example 1, and Comparative Examples 5-7 was tested, as shown in Table 2.

[0040] Table 2

[0041] As can be seen from Table 1, the wear amount of Examples 1-3 is below 89mg, while the wear amount of Comparative Example 1 is 93mg. Comparative Example 1 is a commercially available product. It can be seen that the wear amount of the anti-interference low-voltage multilayer cable of the present invention is lower than that of commercially available products, and its wear resistance is worse than that of commercially available products. However, the wear amount of Comparative Examples 2-4 is further increased. It can be seen that only when the raw materials of the present invention are combined can the synergistic effect achieve the effect of improving wear resistance. The wear resistance of a single raw material is not as good as that of the Examples.

[0042] As can be seen from Table 2, the volume resistivity of Examples 1-3 is all 3.1 × 10⁻⁶. 14 The resistivity of commercially available products is not as good as that of this invention (Ω·m). The lubricant used in Comparative Example 7 is a chlorinated paraffin lubricant commonly used in industry. After its addition, its insulation performance is worse than that of Comparative Example 5 and Comparative Example 6, but not as good as that of Examples 1-3. This shows that the raw materials in Comparative Example 5 and Comparative Example 6 need to be used in combination to achieve better results. The paraffin emulsion prepared by this invention has a better effect on improving the insulation performance of cables.

[0043] Example 4: An anti-interference low-voltage multilayer cable is manufactured using the same process as described in Example 1 above. Figure 1 As shown, it includes a cable core, a double-layer shielding layer, and a sheath layer.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A manufacturing process for an anti-interference low-voltage multilayer cable, characterized in that, Specifically, the following steps are included: A tight-buffered optical fiber is placed as the central unit. A silver-plated copper conductor and aramid yarn are twisted together around the central unit using a high-speed twisting machine at a speed of 1500-1800 rpm. The twisted wire diameter is 0.04-1.8 mm, and the twisted cross-section is 3-6.5 mm². 2 The cable core is obtained; Install the shielding film reel onto the high-speed wrapping machine, adjust the wrapping pitch of the wrapping machine to 20-50mm, and the wrapping angle to 40°-60°, and wrap a shielding layer around the cable core. Before the braiding process begins, a lead wire is placed parallel to the cable core that has already been wrapped with a shield. Then, a silver-plated copper wire spool is installed on a high-speed braiding machine. The cable core with the lead wire integrated is passed through the center of the braiding machine. The braiding pitch of the braiding machine is adjusted to 20-40mm, the braiding angle to 50°-70°, and the spindle speed to 800-1400rpm to form a double shielding layer and obtain a double-shielded cable. 2-4 parts by weight of insulating sheath raw material, 3-5 parts by weight of composite lubricant, 2-4 parts by weight of plasticizer epoxidized soybean oil, and 20-40 parts by weight of polypropylene are extruded through a twin-screw extruder at 190-200℃. The extrudate is first cooled to 60-65℃, then cooled in a water bath at 30-45℃, granulated, and then the resulting granules are injection molded at 170-210℃ using an injection molding machine. After cooling, a polypropylene insulated cable protective sheath is obtained, which is wrapped around the cable core with the completed shielding layer and cooled to set. Then, the polypropylene insulated cable protective sheath is subjected to electron cross-linking irradiation with an irradiation dose of 100-300 kGy for 10-15 minutes to form a sheath layer, resulting in an anti-interference low-voltage multilayer cable.

2. A manufacturing process for an anti-interference low-voltage multilayer cable according to claim 1, characterized in that, The shielding layer film is specifically an aluminized polyester film or a nano-ceramic coated polyimide film with a thickness of 12-50μm.

3. The manufacturing process of the anti-interference low-voltage multilayer cable according to claim 1, characterized in that, The lead wire is specifically a soft tin-plated copper wire with a diameter of 0.3-0.5mm that has undergone annealing treatment.

4. The manufacturing process of the anti-interference low-voltage multilayer cable according to claim 1, characterized in that, The pellet size is 3mm x 3mm or 4mm x 4mm.

5. The manufacturing process of the anti-interference low-voltage multilayer cable according to claim 1, characterized in that, The specific materials for the insulating sheath are: Mix 3-6 parts by weight of β-cyclodextrin with 1-2 parts by weight of graphene oxide, ball mill for 1-2 hours, transfer the ball milling product to 100-110 parts by weight of deionized water, disperse by ultrasonication, then centrifuge to collect the solid precipitate, dry the obtained solid precipitate at 70-75℃ for 24-25 hours, and then grind the dried material to obtain the ground powder. Add 2-3 parts by mass of alkaline solution and 4-5 parts by mass of Cu / Zn / Al mixed salt solution to the ground powder. The molar ratio of Cu, Zn and Al in the Cu / Zn / Al mixed salt solution is 2:1:

1. Stir and mix at 500-600 rpm for 30-35 minutes and then perform ultrasonic dispersion. Add 5-8 parts by mass of additives and react at 300-400 rpm at 60-80℃ for 2-3 hours. Then treat with nitrogen at 240-250℃ for 2-2.5 hours. Filter, wash and dry the product. Place the dried product in a tube furnace and treat at 400-420℃ for 1-1.5 hours under a nitrogen atmosphere. Compress and granulate to obtain the insulating sheath raw material.

6. The manufacturing process of the anti-interference low-voltage multilayer cable according to claim 1, characterized in that, The specific preparation process of the composite lubricant is as follows: Mix 4-8 parts by weight of liquid paraffin, 1-3 parts by weight of cottonseed oil, 1-1.5 parts by weight of white oil, and 2-3 parts by weight of gum arabic. Stir at 300-350 rpm for 10-15 minutes at 50-60℃ to obtain paraffin emulsion. Add 8-10 parts by weight of paraffin emulsion, 4-5 parts by weight of silicone grease, and 1-3 parts by weight of stearic acid to a stirred ball mill. Then add 1-1.5 parts by weight of silica and 0.5-1.5 parts by weight of polyvinyl alcohol as a stabilizer. Stir and mix at 800-900 rpm for 20-25 minutes. The resulting product is the composite lubricant.

7. The manufacturing process of the anti-interference low-voltage multilayer cable according to claim 5, characterized in that, The additive is specifically prepared by mixing formamide and glycerol in a volume ratio of 1:

3.

8. The manufacturing process of the anti-interference low-voltage multilayer cable according to claim 5, characterized in that, The alkaline solution was prepared by mixing sodium carbonate solution and sodium hydroxide solution in a volume ratio of 1:(1-2).

9. An anti-interference low-voltage multilayer cable, characterized in that, It is prepared by the manufacturing process of anti-interference low-voltage multilayer cable as described in any one of claims 1-8.

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