A production method for corrosion-resistant and environmentally friendly cable

Abstract

The present invention relates to the field of cables, and in particular to a method for producing a corrosion-resistant and environment-friendly cable, comprising the following steps: concentrically twisting a number of copper wires to obtain a wire core, and feeding the conductor composed of the wire core into an extruder; the extruder extrudes an insulating layer on the outside of the conductor to obtain a first semi-finished cable and cools it; the coating machine coats the cooled first semi-finished cable, and the braiding machine twists the copper wires on the coated first semi-finished cable to obtain a second semi-finished cable; the extruder sequentially extrude a waterproof layer and a sheath on the second semi-finished cable to form a third semi-finished cable; and the surface of the third semi-finished cable is coated with a corrosion-resistant coating to form a cable. This solution improves the corrosion resistance of the cable by applying a corrosion-resistant coating on the surface of the cable, and by dividing the corrosion-resistant coating into an outer coating and an inner coating, the cold resistance of the cable is improved by the inner coating, and the flame retardancy of the cable is improved by the outer coating, which is beneficial to improving the overall performance of the cable.

Description

Technical Field

[0001] The invention relates to the field of cables, and in particular to a method for producing a corrosion-resistant and environment-friendly cable. Background Art

[0002] The insulation materials commonly used in traditional cables include polyvinyl chloride (PVC), cross-linked polyethylene (XLPE), etc. These materials have certain performance in electrical insulation and mechanical protection, but they release toxic gases and smoke when burned, which is harmful to the environment and human health. In order to solve this problem, many environmentally friendly cables have now appeared.

[0003] For example, the prior art CN210325278U discloses an impact-resistant, corrosion-resistant and environmentally friendly robot cable, which is characterized in that it includes: a cable core body, including: a conductor formed by multiple copper wires, the outer diameter of a single copper wire is not more than 0.51 mm, and the number of wires is not more than 157, an insulating layer is provided on the outside of the conductor, a non-metallic sheath is provided on the outside of the insulating layer, three cable core bodies form a cable core, a metal shielding layer is provided on the outside of the cable core, an inner sheath is provided on the outside of the metal shielding layer, a chain armor layer is provided on the outside of the inner sheath, an acrylic anti-corrosion coating is provided on the outside of the chain armor layer, and an outer sheath is provided on the outside of the acrylic anti-corrosion coating.

[0004] Another typical example is an environmentally friendly fireproof, insulated, and corrosion-resistant armored cable disclosed in the prior art of CN104332233B, which includes a wire core, a conductor, an insulating layer, a shielding layer, and an outer sheath. The conductor has a circular cross-section; two wire cores are arranged inside the conductor; a reinforcing core fixedly connected by a PVC plastic connecting rod is arranged outside the conductor; the reinforcing core is evenly arranged in the PVC plastic connecting rod; a filling layer is arranged in the gap between the conductor and the PVC plastic connecting rod; a drainage core is arranged between the conductors; the drainage core is tangent to the conductor; an insulating layer is arranged outside the PVC plastic connecting rod; the surface of the insulating layer is coated with an insulating paint layer; the shielding layer is tightly extruded on the outer surface of the insulating paint layer; a flame-retardant glass fiber braided layer is tightly extruded outside the shielding layer; the flame-retardant glass fiber braided layer is tightly extruded from the inside to the outside with an armor layer, an inner sheath, and an outer sheath; and FRP strips and steel wires are tightly arranged in the anti-corrosion asphalt layer.

[0005] Let's look at an environmentally friendly waterproof and corrosion-resistant control cable disclosed in the prior art of CN103943233A, which is composed of a wire core, a water-blocking wrapping tape and an outer sheath. The outer conductor of the wire core is an insulating layer; the outer conductor of the insulating layer is formed by extruding a shielding layer; the wire core, the insulating layer and the shielding layer constitute a cable core; the inner part of the cable is composed of two cable cores; the outer part of the cable core is formed by extruding an outer sheath, a stainless steel wire braided armor anti-corrosion layer and a water-blocking wrapping tape; two ground wire cores are arranged in the gap between the water-blocking wrapping tape and the cable core.

[0006] At present, the quality inspection of environmentally friendly cables is relatively simple, but not comprehensive enough. In order to solve the common problems in this field, the present invention is made. Summary of the invention

[0007] The purpose of the present invention is to propose a production method of a corrosion-resistant and environment-friendly cable in view of the existing deficiencies.

[0008] In order to overcome the shortcomings of the prior art, the present invention adopts the following technical solutions:

[0009] A method for producing a corrosion-resistant and environmentally friendly cable comprises the following steps:

[0010] S1, a plurality of copper wires are concentrically twisted to obtain a wire core, and the conductor composed of the wire core is sent to an extruder;

[0011] S2, the extruder extrudes an insulating layer on the outside of the conductor to obtain a first semi-finished cable and cools it;

[0012] S3, a laminating machine coats the cooled first semi-finished cable with a copper foil, and a braiding machine twists copper wires on the coated first semi-finished cable to form a shielding layer, thereby obtaining a second semi-finished cable;

[0013] S4, the extruding machine sequentially extrudes a waterproof layer and a sheath on the second semi-finished cable to form a third semi-finished cable;

[0014] S5, coating a corrosion-resistant coating on the surface of the third semi-finished cable to form a cable;

[0015] S6, testing the cable’s cold resistance, flame retardancy, fit and corrosion resistance;

[0016] S7, analyzing the quality of the cable according to the test results.

[0017] Furthermore, the insulating layer includes powdered magnesium oxide, the particle size of the powdered magnesium oxide is 0.5 to 1 μm, the shielding layer includes a shielding outer layer and a shielding inner layer, the shielding outer layer is composed of copper wire, and the shielding inner layer is composed of copper foil; the sheath is a copper sheath; the cable is wrapped in sequence from the inside to the outside by a core, an insulating layer, a shielding layer, a waterproof layer, a sheath and a corrosion-resistant coating, the core includes a copper conductor, and the core is used to transmit electrical energy; the insulating layer is used to prevent electrical energy leakage or cable short circuit of the cable; the shielding layer is used to reduce electromagnetic interference; the sheath is used to protect the overall structure of the cable; the outer diameter of the cable is greater than 20 mm.

[0018] Furthermore, the corrosion-resistant coating includes an inner coating and an outer coating, and the inner coating is made of 2 to 4 parts of sodium alginate, 4 to 7 parts of aluminum hydroxide powder, 3 to 5 parts of hydroxypropyl methylcellulose, 45 to 55 parts of epoxy resin, 15 to 30 parts of silicate particles, 0.3 to 0.6 parts of curing agent, and 0.5 to 1.5 parts of drying agent in proportion by weight.

[0019] Furthermore, the outer coating is made of 0.22-0.23 parts of europium, 0.26-0.28 parts of silicon, 0.16-0.18 parts of magnesium, 2.60-3.30 parts of cesium, 0.62-0.65 parts of copper, 1.35-1.50 parts of strontium, 0.15-0.20 parts of calcium, 5.35-6.60 parts of thulium, 6.75-8.05 parts of zinc, 0.23-0.26 parts of tungsten, 8.65-11.45 parts of neodymium, 0.13-0.16 parts of carbon, and 21-36 parts of thermoplastic resin mixture in proportion by weight.

[0020] Furthermore, the waterproof layer is made of 16-18 parts of chlorobenzene, 18-20 parts of sodium hydroxide, 20-22 parts of phenylenediamine, 33-35 parts of petroleum resin, 20-22 parts of acrylic resin, 24-26 parts of elastic fiber, 17 parts of chloroprene rubber, 17 parts of silicone acrylic emulsion, 14-16 parts of cyclohexanone, 12-14 parts of methyl ethyl ketone and 17 parts of potassium chloride in proportion by weight.

[0021] Furthermore, coating the corrosion-resistant coating on the surface of the third semi-finished cable includes the following steps:

[0022] S51, mixing the raw materials of the inner coating and applying them on the surface of the sheath;

[0023] S52, heating the third semi-finished cable coated with the inner coating for a specified time, cooling it after the specified time, cutting a section as the first cable to be tested after cooling, and the remaining section as the remaining cable;

[0024] S53, mixing the raw materials of the outer coating and applying the mixture to the remaining cable surface;

[0025] S54, heating the remaining cables for a specified time, cooling them after the specified time, and obtaining a second cable to be tested after cooling.

[0026] Furthermore, the quality of the cable is tested, including the following steps:

[0027] S61, placing the first cable to be tested in a freezer, applying a set pressure to it, and determining whether there are defects on the surface of the first cable to be tested. If not, lowering the temperature of the freezer by 10 degrees Celsius, and repeating this step until defects appear on the surface of the first cable to be tested;

[0028] S62, dividing the second cable to be detected into three sections to obtain a third cable to be detected, a fourth cable to be detected, and a fifth cable to be detected;

[0029] S63, burning the third cable to be detected and the third semi-finished cable, and recording the temperature values ​​of the third cable to be detected and the third semi-finished cable when they start to burn and burn violently;

[0030] S64, applying pressure to a position of the fourth cable to be tested that is 5 cm away from the incision, and obtaining a cross-sectional image of the incision position;

[0031] S65, dripping corrosive liquids of different types and concentrations onto the surface of the fifth cable to be detected, and acquiring the condition of the cable surface through image detection.

[0032] Furthermore, analyzing the quality of the cable to be tested includes the following steps:

[0033] S71, calculating the cold resistance index of the first cable to be detected according to the temperature value when a defect occurs on the surface of the first cable to be detected;

[0034] S72, calculating the flame retardant index of the third cable to be detected according to the temperature values ​​when the third cable to be detected and the third semi-finished cable start to burn and burn violently;

[0035] S73, calculating the fit index of the fourth cable to be detected according to the cross-sectional image of the incision position of the fourth cable to be detected;

[0036] S74, calculating the corrosion resistance index of the fifth cable to be detected according to the surface image of the fifth cable to be detected;

[0037] S75, calculate the cable quality index based on cold resistance index, flame retardancy index, fit index and corrosion resistance index.

[0038] The beneficial effects of this scheme are: 1. By applying a corrosion-resistant coating on the surface of the cable, the corrosion resistance of the cable is improved. By dividing the corrosion-resistant coating into an outer coating and an inner coating, the cold resistance of the cable is improved by the inner coating, and the flame retardancy of the cable is improved by the outer coating, which is beneficial to improving the overall performance of the cable.

[0039] 2. By setting the quality indicators of the cable and calculating the quality indicators of the cable through four aspects: cold resistance, flame retardancy, fit, and corrosion resistance, it is helpful to evaluate the quality of the cable from multiple aspects and improve the comprehensiveness of the evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention can be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily drawn to scale, but the emphasis is placed on illustrating the principles of the embodiments. In different views, the same reference numerals designate the same parts.

[0041] Figure 1 This is a schematic diagram of the cable structure of the present invention.

[0042] Figure 2 The present invention is a flow chart for making the cable.

[0043] Figure 3 The present invention is a flow chart of coating a corrosion-resistant coating on the surface of a third semi-finished cable.

[0044] Figure 4 The present invention is a flow chart for detecting cable quality.

[0045] Reference numerals: core 01, insulation layer 02, shielding layer 03, waterproof layer 04, sheath 05, inner coating 06, outer coating 07. DETAILED DESCRIPTION

[0046] The following is an explanation of the embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual sizes. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0047] Embodiment 1: According to Figure 1 , Figure 2 , Figure 3 and Figure 4 , a method for producing a corrosion-resistant and environmentally friendly cable, comprising the following steps:

[0048] S1, a plurality of copper wires are concentrically twisted to obtain a wire core, and the conductor composed of the wire core is sent to an extruder;

[0049] S2, the extruder extrudes an insulating layer on the outside of the conductor to obtain a first semi-finished cable and cools it;

[0050] S3, a laminating machine coats the cooled first semi-finished cable with a copper foil, and a braiding machine twists copper wires on the coated first semi-finished cable to form a shielding layer, thereby obtaining a second semi-finished cable;

[0051] S4, the extruding machine sequentially extrudes a waterproof layer and a sheath on the second semi-finished cable to form a third semi-finished cable;

[0052] S5, coating a corrosion-resistant coating on the surface of the third semi-finished cable to form a cable;

[0053] S6, testing the cable’s cold resistance, flame retardancy, fit and corrosion resistance;

[0054] S7, analyzing the quality of the cable according to the test results.

[0055] Furthermore, the cable is wrapped in sequence from the inside to the outside with a core, an insulating layer, a shielding layer, a waterproof layer, a sheath and a corrosion-resistant coating, the core comprising a copper conductor, and the core is used to transmit electrical energy; the insulating layer comprises powdered magnesium oxide, the particle size of the powdered magnesium oxide is 0.5 to 1 μm, and the insulating layer is used to prevent electrical energy leakage or cable short circuit of the cable; the shielding layer is used to reduce electromagnetic interference, the shielding layer comprises a shielding outer layer and a shielding inner layer, the shielding outer layer is composed of copper wire, and the shielding inner layer is composed of copper foil; the sheath is used to protect the overall structure of the cable, and the sheath is a copper sheath; the outer diameter of the cable is greater than 20 mm.

[0056] Furthermore, the corrosion-resistant coating includes an inner coating and an outer coating, and the inner coating is made of 2 to 4 parts of sodium alginate, 4 to 7 parts of aluminum hydroxide powder, 3 to 5 parts of hydroxypropyl methylcellulose, 45 to 55 parts of epoxy resin, 15 to 30 parts of silicate particles, 0.3 to 0.6 parts of curing agent, and 0.5 to 1.5 parts of drying agent in proportion by weight.

[0057] Specifically, the inner coating prepared by the above materials has good cold resistance, which is beneficial to improving the working ability of the cable in cold areas;

[0058] Furthermore, the outer coating is made of 0.22-0.23 parts of europium, 0.26-0.28 parts of silicon, 0.16-0.18 parts of magnesium, 2.60-3.30 parts of cesium, 0.62-0.65 parts of copper, 1.35-1.50 parts of strontium, 0.15-0.20 parts of calcium, 5.35-6.60 parts of thulium, 6.75-8.05 parts of zinc, 0.23-0.26 parts of tungsten, 8.65-11.45 parts of neodymium, 0.13-0.16 parts of carbon, and 21-36 parts of thermoplastic resin mixture in proportion by weight.

[0059] Specifically, the outer coating prepared by the above materials has good flame retardancy, which is beneficial to improving the working ability of the cable in cold areas;

[0060] Furthermore, the waterproof layer is made of 16-18 parts of chlorobenzene, 18-20 parts of sodium hydroxide, 20-22 parts of phenylenediamine, 33-35 parts of petroleum resin, 20-22 parts of acrylic resin, 24-26 parts of elastic fiber, 17 parts of chloroprene rubber, 17 parts of silicone acrylic emulsion, 14-16 parts of cyclohexanone, 12-14 parts of methyl ethyl ketone and 17 parts of potassium chloride in proportion by weight.

[0061] Furthermore, coating the corrosion-resistant coating on the surface of the third semi-finished cable comprises the following steps:

[0062] S51, mixing the raw materials of the inner coating and applying them on the surface of the sheath;

[0063] S52, heating the third semi-finished cable coated with the inner coating for a specified time, cooling it after the specified time, combining the inner coating and the surface of the third semi-finished cable after cooling, and cutting a section therefrom as a first cable to be tested;

[0064] S53, mixing the raw materials of the outer coating and applying the mixture to the remaining cable surface;

[0065] Specifically, the remaining cable is the remaining portion of the third semi-finished cable after the first cable to be detected is cut off;

[0066] S54, heating the remaining cable for a specified time, cooling it after the specified time, combining the inner coating and the outer coating after cooling, and obtaining a second cable to be tested.

[0067] Specifically, the heating temperature and heating time are set by those skilled in the art according to the material of the coating, and will not be elaborated here.

[0068] Furthermore, the quality of the cable is tested, including the following steps:

[0069] S61, placing the first cable to be tested in a freezer, applying a set pressure to it, and determining whether there are defects on the surface of the first cable to be tested. If not, lowering the temperature of the freezer by 10 degrees Celsius, and repeating this step until defects appear on the surface of the first cable to be tested;

[0070] Specifically, the initial temperature of the freezing chamber is 0 degrees, and the set pressure value is set by a person skilled in the art;

[0071] S62, dividing the second cable to be detected into three sections to obtain a third cable to be detected, a fourth cable to be detected, and a fifth cable to be detected;

[0072] S63, burning the third cable to be detected and the third semi-finished cable, and recording the temperature values ​​of the third cable to be detected and the third semi-finished cable when they start to burn and burn violently;

[0073] Specifically, a combustion threshold value may be set to determine whether the cable has started to burn and whether it has burned violently. When the concentration of gas generated when the cable burns is greater than a first combustion threshold value, it is determined that the cable has started to burn. When the concentration of gas generated when the cable burns is greater than a second combustion threshold value, it is determined that the cable has burned violently. The first combustion threshold value is less than the second combustion threshold value. The first and second combustion threshold values ​​are set by those skilled in the art based on experience.

[0074] S64, applying pressure to a position of the fourth cable to be tested that is 5 cm away from the incision, and obtaining a cross-sectional image of the incision position;

[0075] Specifically, the applied pressure value is continuously increased from 0 to a pressure threshold, and the pressure threshold is set by those skilled in the art;

[0076] S65, dripping corrosive liquids of different types and concentrations onto the surface of the fifth cable to be detected, and acquiring the condition of the cable surface through image detection.

[0077] Specifically, the corrosive liquid may be sodium hydroxide, hydrochloric acid or the like, and may be set according to the corrosive substances that may exist in the scene where the cable is to be used;

[0078] Furthermore, analyzing the quality of the cable to be tested includes the following steps:

[0079] S71, calculating the cold resistance index of the first cable to be detected according to the temperature value when a defect occurs on the surface of the first cable to be detected;

[0080] The cold resistance index can be calculated according to the following formula:

[0081]

[0082] Wherein, ZB1 is the cold resistance index, F1 is the pressure applied to the first cable to be detected, T1 is the temperature value in the freezer when the first cable to be detected has a defect, S1 is the surface area of ​​the defect of the first cable to be detected, and S is the surface area of ​​the first cable to be detected;

[0083] S72, calculating the flame retardant index of the third cable to be tested according to the temperature values ​​when the third cable to be tested and the third semi-finished cable start to burn and burn violently:

[0084] The flame retardant index can be calculated according to the following formula:

[0085]

[0086] Among them, ZB2 is the flame retardant index, T2 is the temperature value when the third cable to be tested begins to burn, t2 is the temperature value when the third semi-finished cable begins to burn, T3 is the temperature value when the third cable to be tested burns violently, and t3 is the temperature value when the third semi-finished cable burns violently;

[0087] S73, calculating the fit index of the fourth cable to be detected according to the cross-sectional image of the incision position of the fourth cable to be detected:

[0088] The fit index can be calculated according to the following formula:

[0089]

[0090] Wherein, ZB3 is the fit index, F2 is the pressure threshold of the pressure applied to the fourth cable to be detected, D1(F) is the number of pixels when the number of pixels between the sheath and the inner coating in the cross-sectional image of the fourth cable to be detected is greater than the first pixel threshold, when the number of pixels between the sheath and the inner coating is ≤ the first pixel threshold, D1(F) is set to d1, D2(F) is the number of pixels when the number of pixels between the outer coating and the inner coating in the cross-sectional image of the fourth cable to be detected is greater than the second pixel threshold, when the number of pixels between the outer coating and the inner coating is ≤ the second pixel threshold, D1(F) is set to d2, d1 is the first pixel threshold, and d2 is the second pixel threshold;

[0091] Specifically, when the number of pixels between the sheath and the inner coating or between the outer coating and the inner coating in the cable is greater than the corresponding threshold, it is considered that there is a gap between the two layers and the degree of adhesion is poor. The first pixel threshold and the second pixel threshold are the ideal number of pixels between the corresponding layers when the layers of the cable are tightly attached. The first pixel threshold and the second pixel threshold are ideal pixel thresholds obtained by technicians in this field with reference to the number of pixels between the layers when other high-quality cables are under pressure.

[0092] S74, calculating the corrosion resistance index of the fifth cable to be detected according to the surface image of the fifth cable to be detected:

[0093] The corrosion resistance index can be calculated according to the following formula:

[0094]

[0095] Among them, ZB4 is the corrosion resistance index, I is the number of types of corrosive liquids, start i is the concentration of the i-th corrosive liquid when it starts to corrode the cable. Whether the cable starts to corrode can be judged by naked eye observation or image recognition technology. max i A is the maximum concentration of the i-th corrosive liquid when it corrodes the cable. The maximum concentration is set by a person skilled in the art according to the possible concentration of corrosive substances that may exist in the scene where the cable is to be used. i is the defect area caused by the corrosion of the i-th corrosive liquid on the cable, B i is the defect depth caused by the i-th corrosive liquid on the cable; during the corrosion test, the concentration of the corrosive liquid gradually increases from the minimum to the maximum concentration;

[0096] S75, calculate the cable quality index based on cold resistance index, flame retardancy index, fit index and corrosion resistance index.

[0097] The quality index can be calculated according to the following formula:

[0098] ZB=k1*ZB1+k2*ZB2+k3*ZB3+k4*ZB4

[0099] Among them, ZB is the quality index, k1 is the cold resistance weight, k2 is the flame retardant weight, k3 is the fit weight, and k4 is the corrosion resistance weight; the cold resistance weight can be set according to the absolute value of the difference between the lowest temperature value in the past year and 26 degrees Celsius in the scenario where the cable will be used. The greater the difference between the ambient temperature of the cable and the ideal working temperature, the greater the weight; the flame retardant weight can be set according to the ratio between the temperature value corresponding to the start of combustion and the maximum combustion temperature value. The easier the cable is to burn, the greater the weight. The maximum combustion temperature value can be set by technical personnel in this field based on experience, generally 800 to 1000 degrees Celsius; the fit weight can be set according to the radius of the cable after the corrosion-resistant layer is coated. The easier it is to have gaps at the cable joint, the greater the weight; the corrosion resistance weight can be set according to the number of types of corrosive substances that may be contained in the scenario where the cable will be used. The more types there are, the greater the corrosion resistance weight;

[0100] For example, assuming that the cable will be used in a scenario where the lowest temperature in the past year was zero degrees, k1 can be T max The temperature value corresponding to the start of combustion of the third cable to be tested is 300°C, and the maximum temperature value during the combustion process is 400°C. k2 is The radius of the cable (including the corrosion-resistant coating) is 7 mm, the thickness of the corrosion-resistant coating (i.e. the sum of the thickness of the inner coating and the outer coating) is 0.7 mm, and k3 can be For k4: the value of k4 can be set according to the corrosive substances that may be contained in the scene where the cable will be used. The more corrosive substances that may be contained, the larger the value. The optional values ​​are 0.2, 0.6, 1.0 and 1.4. For example, when the scene to be used is in a general building, take 0.2; when the scene to be used is outdoors in the city, take 0.6; when the scene to be used is in a natural environment such as a mountainous area, take 1.0; when the scene to be used is a chemical laboratory or a chemical plant, take 1.4;

[0101] Specifically, the cold resistance index is used to characterize the cold resistance of the cable, and the larger the index is, the better the cold resistance is; the flame retardant index is used to characterize the flame retardant ability of the cable, and the larger the index is, the better the flame retardant ability is; the fitting index is used to characterize the fitting ability of the corrosion-resistant coating of the cable, and the larger the index is, the better the fitting ability is; the corrosion resistance index is used to characterize the corrosion resistance of the corrosion-resistant coating of the cable, and the larger the index is, the better the corrosion resistance is; the quality index is used to characterize the overall quality of the cable, and the larger the index is, the better the cable quality is.

[0102] The beneficial effects of this scheme are: 1. By applying a corrosion-resistant coating on the surface of the cable, the corrosion resistance of the cable is improved. By dividing the corrosion-resistant coating into an outer coating and an inner coating, the cold resistance of the cable is improved by the inner coating, and the flame retardancy of the cable is improved by the outer coating, which is beneficial to improving the overall performance of the cable.

[0103] 2. By setting the quality indicators of the cable and calculating the quality indicators of the cable through four aspects: cold resistance, flame retardancy, fit, and corrosion resistance, it is helpful to evaluate the quality of the cable from multiple aspects and improve the comprehensiveness of the evaluation.

[0104] Embodiment 2: This embodiment should be understood to include all the features of any of the above embodiments, and further improve on the basis thereof. In order to more accurately reflect the weight of each indicator, the weight values ​​of each indicator can also be obtained in the following manner:

[0105] For k1:

[0106]

[0107] Among them, min t is the lowest temperature value in the past year for the scenario where the cable will be used, in degrees Celsius; day is the number of days in the past year with a temperature value close to the lowest temperature value for the scenario where the cable will be used, and a temperature value close to the lowest temperature value is a temperature value that falls within the range of [lowest temperature value, lowest temperature value plus 5 degrees Celsius];

[0108] For k2:

[0109]

[0110] Wherein, T2 is the temperature value when the third cable to be tested starts to burn, T3 is the temperature value when the third cable to be tested burns violently, and max is the maximum combustion temperature value of the finished cable during the combustion process;

[0111] For k3:

[0112]

[0113] Wherein, R is the radius of the cable (including the corrosion-resistant coating), and r is the thickness of the corrosion-resistant coating (i.e., the sum of the thickness of the inner coating and the outer coating);

[0114] k4 is preferably num is the number of types of corrosive substances that may be contained in the scenario where the cable will be used.

[0115] Beneficial effects of this embodiment: Considering multiple factors to set various weights is conducive to the value of each weight being more in line with actual needs, which is conducive to improving the comprehensiveness and accuracy of quality indicators.

[0116] The above disclosed contents are only preferred feasible embodiments of the present invention, and do not limit the protection scope of the present invention. Therefore, all equivalent technical changes made by using the contents of the present invention specification and drawings are included in the protection scope of the present invention. In addition, the elements therein can be updated with the development of technology. The above units are only examples. Those skilled in the art can use corresponding units according to different designs according to actual needs when implementing this solution.

Claims

1. A method for producing a corrosion-resistant and environmentally friendly cable, characterized in that: The following steps are involved: S1, a plurality of copper wires are concentrically twisted to obtain a wire core, and the conductor composed of the wire core is sent to an extruder; S2, the extruder extrudes an insulating layer on the outside of the conductor to obtain a first semi-finished cable and cools it; S3, a laminating machine coats the cooled first semi-finished cable with a copper foil, and a braiding machine twists copper wires on the coated first semi-finished cable to form a shielding layer, thereby obtaining a second semi-finished cable; S4, the extruding machine sequentially extrudes a waterproof layer and a sheath on the second semi-finished cable to form a third semi-finished cable; S5, coating a corrosion-resistant coating on the surface of the third semi-finished cable to form a cable; S6, testing the cable’s cold resistance, flame retardancy, fit and corrosion resistance; S7, analyzing the quality of the cable according to the test results; Applying the corrosion-resistant coating on the surface of the third semi-finished cable includes the following steps: S51, mixing the raw materials of the inner coating and applying them on the surface of the sheath; S52, heating the third semi-finished cable coated with the inner coating for a specified time, cooling it after the specified time, cutting a section as the first cable to be tested after cooling, and the remaining section as the remaining cable; S53, mixing the raw materials of the outer coating and applying the mixture to the remaining cable surface; S54, heating the remaining cables for a specified time, cooling them after the specified time, and obtaining a second cable to be tested after cooling; The quality of the cable is tested, including the following steps: S61, placing the first cable to be tested in a freezer, applying a set pressure to it, and determining whether there are defects on the surface of the first cable to be tested. If not, lowering the temperature of the freezer by 10 degrees Celsius, and repeating this step until defects appear on the surface of the first cable to be tested; S62, dividing the second cable to be detected into three sections to obtain a third cable to be detected, a fourth cable to be detected, and a fifth cable to be detected; S63, burning the third cable to be detected and the third semi-finished cable, and recording the temperature values ​​of the third cable to be detected and the third semi-finished cable when they start to burn and burn violently; S64, applying pressure to a position of the fourth cable to be tested at a distance of 5 cm from the incision to obtain a cross-sectional image of the incision position; S65, dropping corrosive liquids of different types and concentrations on the surface of the fifth cable to be detected, and obtaining the condition of the cable surface through image detection; Analyzing the quality of the cable to be tested includes the following steps: S71, calculating the cold resistance index of the first cable to be detected according to the temperature value when a defect occurs on the surface of the first cable to be detected; S72, calculating the flame retardant index of the third cable to be detected according to the temperature values ​​when the third cable to be detected and the third semi-finished cable start to burn and burn violently; S73, calculating the fit index of the fourth cable to be detected according to the cross-sectional image of the incision position of the fourth cable to be detected; S74, calculating the corrosion resistance index of the fifth cable to be detected according to the surface image of the fifth cable to be detected; S75, calculate the cable quality index based on cold resistance index, flame retardancy index, fit index and corrosion resistance index.

2. The method for producing a corrosion-resistant and environmentally friendly cable according to claim 1, characterized in that: The insulating layer comprises powdered magnesium oxide, the particle size of the powdered magnesium oxide is 0.5-1 μm, the shielding layer comprises a shielding outer layer and a shielding inner layer, the shielding outer layer is composed of copper wire, and the shielding inner layer is composed of copper foil; the sheath is a copper sheath.

3. The method for producing a corrosion-resistant and environmentally friendly cable according to claim 2, characterized in that: The corrosion-resistant coating comprises an inner coating and an outer coating, wherein the inner coating is made of 2 to 4 parts of sodium alginate, 4 to 7 parts of aluminum hydroxide powder, 3 to 5 parts of hydroxypropyl methylcellulose, 45 to 55 parts of epoxy resin, 15 to 30 parts of silicate particles, 0.3 to 0.6 parts of curing agent, and 0.5 to 1.5 parts of drying agent in proportion by weight.

4. The method for producing a corrosion-resistant and environment-friendly cable according to claim 3, characterized in that: The outer coating is made of 0.22-0.23 parts of europium, 0.26-0.28 parts of silicon, 0.16-0.18 parts of magnesium, 2.60-3.30 parts of cesium, 0.62-0.65 parts of copper, 1.35-1.50 parts of strontium, 0.15-0.20 parts of calcium, 5.35-6.60 parts of thulium, 6.75-8.05 parts of zinc, 0.23-0.26 parts of tungsten, 8.65-11.45 parts of neodymium, 0.13-0.16 parts of carbon, and 21-36 parts of a thermoplastic resin mixture in proportion by weight.

5. The method for producing a corrosion-resistant and environment-friendly cable according to claim 4, characterized in that: The waterproof layer is made of 16-18 parts of chlorobenzene, 18-20 parts of sodium hydroxide, 20-22 parts of phenylenediamine, 33-35 parts of petroleum resin, 20-22 parts of acrylic resin, 24-26 parts of elastic fiber, 17 parts of chloroprene rubber, 17 parts of silicone acrylic emulsion, 14-16 parts of cyclohexanone, 12-14 parts of methyl ethyl ketone and 17 parts of potassium chloride, which are mixed in proportion by weight.

Images