A corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable and its preparation method

Abstract

The invention discloses a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable and a preparation method thereof. The cable comprises a detection module, wherein the detection module comprises a data processing module, a front image acquisition module and a rear image acquisition module. The front image acquisition module and the rear image acquisition module respectively move circumferentially around a cable core to be detected. In the invention, the curved surface structure on the surface of the cable core is converted into a plane structure for detection, so that the detection process of the cable core is more efficient. At the same time, multi-dimensional detection and comparison of the surface of the cable core is beneficial to improving the detection accuracy of visual detection of the cable core. The cable core is suitable for detection of different types of cable cores and has a wider range of uses. In the production process of cable strands, the strands can be better detected to improve the production efficiency and yield of cable production. The detection efficiency of the stranded wire quality is high and the error is smaller, thereby improving the corrosion resistance of the cable core.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent cable manufacturing, and in particular to a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable and a preparation method thereof. Background Art

[0002] As described in the published patent "Online Detection Method of Cable Pitch Based on Machine Vision" with publication number CN109059789A, in the cable industry, the pitch (also known as lay length) during the twisting process is an important indicator that affects cable performance indicators and enterprise cost accounting. The pitch usually refers to the distance along the cable direction that a single cable on the stranded wire travels around the center for one circle. The smaller the pitch, the tighter the cable is wound, and vice versa. The pitch has a direct impact on the softness, toughness, resistance, electrical performance attenuation and other indicators of the stranded wire, and there are also relevant specifications for such parameters in the relevant national conductor standards.

[0003] For twisted cables with specific processes and specific application requirements, the presence of deviated pitches will not only affect the quality of the product itself, but also interfere with the product manufacturing cost accounting (for example, too small a pitch will cause the cable to become harder and the copper wire cost to rise, etc.). The pitch is usually determined by parameters such as the twisting speed, extrusion speed, and number of twisted strands. In the production process, it is usually determined by assuming it to be an ideal value and then performing random inspections. Random inspections are not only time-consuming and labor-intensive, but may also lead to misjudgments and delayed judgments, resulting in unnecessary losses.

[0004] As described in the published patent "A cable strand quality inspection system and inspection method based on machine vision" with publication number CN107703148A, the existing cable strand quality inspection is performed manually with a micrometer and visual inspection. This contact-type manual inspection requires stopping the transmission of the cable strand for inspection, which has the problems of low efficiency, large errors, inaccurate inspection, and affecting production progress. It may even damage the cable strand and scratch the palm.

[0005] In summary, in the production process of cable strands, the strands need to be inspected to improve the production efficiency and yield of cable production. In the prior art, the inspection of the quality of the strands has the problems of low efficiency and large errors. Summary of the invention

[0006] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable, comprising a detection module, wherein the detection module comprises a data processing module, a front image acquisition module and a rear image acquisition module;

[0009] The front image acquisition module and the rear image acquisition module respectively move circumferentially around the cable core to be detected, and the data processing module is used to process the data acquired by the front image acquisition module and the rear image acquisition module;

[0010] The operation of the detection module includes the following steps:

[0011] S100: The cable core to be detected includes pitches S1, S2, ..., Sn arranged in sequence from front to back, the front image acquisition module includes a first camera module, the first camera module performs a first circumferential movement φ1 around the cable core to be detected, the data processing module establishes a corresponding detection image P11 based on the image information of the pitch S1 acquired by the first camera module, the first circumferential movement φ1 of the first camera module corresponds to the linear movement forward of the cable core to be detected, so that the detection image P11 presents a continuous multi-row straight line structure, and so on, the detection images P12, ..., detection images P1n are obtained, and the first camera module cooperates with the feedback of the data processing module to perform circumferential and axial movement coordination;

[0012] S200: Based on the detection image P11, establish a priori model M1, and compare the detection images P12, ..., detection images P1n with the priori model;

[0013] S300: The rear image acquisition module includes a second camera module, and the second camera module performs a second circumferential motion φ2 around the cable core to be detected. The data processing module establishes a corresponding detection image P21 based on the image information of the pitch S1 obtained by the second camera module. The second circumferential motion φ2 of the second camera module is differentially coordinated with the forward linear motion of the cable core to be detected, so that the detection image P21 has a continuous segment structure, and so on, to obtain detection images P22, ..., detection images P2n, and the data processing module performs image analysis on the detection images P21, detection images P22, ..., detection images P2n, respectively.

[0014] As a further solution of the present invention: step S100 includes the following steps:

[0015] S110: The front image acquisition module further includes a first arc-shaped guide rail, the first camera module includes a first camera component and a second camera component disposed on the first arc-shaped guide rail, and the first camera component, the second camera component and the cable core to be detected are disposed in a colinear manner;

[0016] S120: The imaging range of the first camera component and the second camera component is larger than the diameter of the cable core to be detected;

[0017] S130: The rate at which the cable core to be tested is transmitted forward linearly and uniformly is denoted as v1, the pitch of the cable core is denoted as S, and the angular velocity of the first camera device and the second camera device performing the first circumferential motion φ1 is denoted as ω1, wherein the angular velocity ω1 follows the following calculation formula: ω1=360v1 / S.

[0018] As a further solution of the present invention: the step S110 includes the following steps:

[0019] S111: A linear guide rail is arranged along the parallel direction of the cable core to be detected, and the first arc guide rail is slidably installed on the linear guide rail for axial displacement. When the image acquisition operation of the first camera component and the second camera component is in the process of the pitch Sn segment, if the data feedback of the data processing module is abnormal, then after the first camera component and the second camera component complete the detection of the current pitch Sn, the first arc guide rail is displaced axially forward for a time of t2, and the axial movement speed of the first arc guide rail is recorded as v2, v2>v1, and t2 follows the following calculation formula: t2=S(v2-v1);

[0020] S112: After the first arc-shaped guide rail is displaced axially forward for a predetermined time, the first camera component and the second camera component return to step S130.

[0021] As a further solution of the present invention: the step S110 further includes the following steps:

[0022] S113: An oil brushing member is also slidably mounted on the linear guide rail, and the oil brushing member is arranged in front of the first arc guide rail. The oil brushing member is fixedly connected to the first arc guide rail and the relative distance is less than S. When the image acquisition operation of the first camera member and the second camera member is in the process of the pitch Sn segment, when the data feedback of the data processing module is abnormal, after the first camera member and the second camera member complete the detection of the pitch Sn+1, the first arc guide rail moves forward axially for a time of t3, and at the same time, the oil brushing member starts to tighten and perform the oil brushing operation. The axial movement speed of the first arc guide rail is recorded as v3, v3>v1, and t3 follows the following calculation formula: t3=2S(v3-v1);

[0023] S114: After the first arc-shaped guide rail is displaced axially forward for a predetermined time, the oil brushing component is released to end the oil brushing operation, and the first camera component and the second camera component return to step S130.

[0024] As a further solution of the present invention: the step S200 further includes the following steps:

[0025] S210: The detection image P11 includes a plurality of parallel strip lines and a plurality of parallel shadow lines between adjacent strip lines, and a priori model M1 is established based on the distribution and quantity of the plurality of strip lines and the plurality of shadow lines constituting the detection image P11;

[0026] S220: Establishing the prior model includes: determining the area of ​​the detection image P11;

[0027] Determine one of the plurality of strip-shaped lines that is located at the upper end or the lower end in the radial direction as the first conductor line X1, and fit a reference straight line X1' along the center line of X1;

[0028] Determine the first shadow line Y1 among the multiple shadow lines that fit X1, and fit a reference straight line Y1' along the center line of Y1;

[0029] Determine that the strip lines among the plurality of strip lines are aligned with Y1 and record them as the second conductor line X2, and fit a reference straight line X2' along the center line of X2;

[0030] Determine the shadow lines that fit X2 among the multiple shadow lines as the second shadow line Y2, and fit a reference straight line Y2' along the center line of Y2;

[0031] By analogy, we can obtain the prior model composed of reference straight lines, that is, the prior model = {X1', Y1', X2', ..., Yn'};

[0032] S230: Compare the detection images P12, ..., detection images P1n with {X1', Y1', X2', ..., Yn'} respectively.

[0033] As a further solution of the present invention: step S220 includes the following steps:

[0034] S221: After obtaining the prior model, according to step S220, obtain the comparison model 12 and the comparison model 13 from the detection images P12 and P13;

[0035] S222: Compare the comparison model 12 and the comparison model 13 with the prior model. If the comparison results are consistent, the prior model is qualified; otherwise, the prior model is unqualified.

[0036] S223: If the prior model is unsatisfactory, manual intervention is used to correct it.

[0037] As a further solution of the present invention: step S230 includes the following steps:

[0038] S231: Determine the area of ​​the detection image P1n;

[0039] Determine that one of the multiple strip-shaped lines in the detection image P1n is at the upper end or the lower end in the radial direction and is recorded as X1n. X1' is offset upward by a distance L1 and then compared with the upper edge of X1n. X1' is offset downward by a distance L1 and then compared with the lower edge of X1n.

[0040] Determine that the shadow line that fits X1n among the multiple shadow lines is recorded as the first shadow line Y1n, Y1' is offset upward by a distance L2 and then compared with the upper edge of Y1n, and Y1' is offset downward by a distance L2 and then compared with the lower edge of Y1n;

[0041] Determine that the strip lines that fit Y1n are marked as second conductor lines X2n, X2' is offset upward by a distance L1 and then compared with the upper edge of X2n, and X2' is offset downward by a distance L1 and then compared with the lower edge of X2n;

[0042] Determine that the shadow line that fits X2n is recorded as the second shadow line Y2n, and Y2' is offset upward by a distance L2 and compared with the upper edge of Y2n, and Y2' is offset downward by a distance L2 and compared with the lower edge of Y2n;

[0043] And so on;

[0044] L1 is half of the standard diameter of the metal conductor, and L2 is half of the standard line gap of the metal conductor;

[0045] S232: During the comparison process, if the upper edge offset difference of X1n is equal to the lower edge, then proceed to step S233; if the upper edge offset difference of X1n is not equal to the lower edge, then proceed to step S234:

[0046] S233: Compare the upper edge offset value and the lower edge offset value of Y11. If the upper edge offset value and the lower edge offset value of Y1n are within the threshold range, the comparison is qualified. If the upper edge offset value and the lower edge offset value of Y11 are outside the threshold range, the comparison result is unqualified, and so on.

[0047] S234: If the upper edge offset difference and the lower edge offset value of X1n are both within the threshold range, the comparison is qualified; if either the upper edge offset difference and the lower edge offset value of X1n exceeds the threshold range, the comparison result is unqualified.

[0048] As a further solution of the present invention: step S300 includes the following steps:

[0049] S310: The rear image acquisition module further includes a second arc-shaped guide rail, the second camera module includes a third camera component disposed on the second arc-shaped guide rail, and the angular velocity of the third camera component performing the second circumferential motion φ2 is recorded as ω2, wherein ω2>360v1 / S,

[0050] S320: The image acquisition of the third camera device includes a first local area and a second local area, and the third camera device focuses on and photographs the first local area and the second local area respectively, the first local area includes a single metal conductor located at the upper end, and the second local area includes a single metal conductor located at the lower end;

[0051] S330: Analyze the images of the first local area and the second local area respectively.

[0052] As a further solution of the present invention: Step S320 includes the following steps:

[0053] S321: The lens of the third camera device is perpendicular to the bending direction of the metal conductor on the surface of the cable core to be detected.

[0054] A corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable is prepared using the corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable and the preparation method thereof according to claims 1-9.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] In the present invention, the curved surface structure of the cable core surface is converted into a plane structure for detection, so that the detection process of the cable core is made more efficient. At the same time, multi-dimensional detection and comparison of the surface of the cable core is beneficial to improving the detection accuracy of the cable core visual detection. The invention is suitable for the detection of different types of cable cores and has a wider range of uses. In the production process of cable stranding, the stranded wires can be better detected to improve the production efficiency and yield of cable production. The detection efficiency of the stranded wire quality is high and the error is smaller, thereby improving the corrosion resistance of the cable core. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic diagram of the structure of a cross-linked polyethylene cable in the prior art;

[0058] Figure 2 is a stereoscopic diagram of the cable core structure of the present invention;

[0059] Figure 3 It is a right side view of the cable core structure of the present invention;

[0060] Figure 4 It is a three-dimensional structural schematic diagram of the present invention;

[0061] Figure 5 It is a schematic diagram of the operation of the front image acquisition module in the present invention;

[0062] Figure 6 It is a schematic structural diagram of the detection diagram P11 in the present invention;

[0063] Figure 7 is a schematic diagram of the operation of the post-image acquisition module in the present invention;

[0064] Figure 8 It is a schematic diagram of the structure of the detection diagram p21 in the present invention;

[0065] Fig. 9 It is a schematic diagram of the working direction of the first camera component and the second camera component in the present invention for image acquisition;

[0066] Fig.10 It is a schematic diagram of collecting images of a single metal conductor in a vertical direction f1 and a tangential direction f2 respectively in the present invention;

[0067] Fig.11 is a partial view of a single metal conductor located at the upper end of the cable core of the present invention;

[0068] Fig.12 is a flow chart of steps S100-S300 in the present invention;

[0069] Fig.13 is a flow chart of steps S110-S130 in the present invention;

[0070] Fig.14 is a flow chart of steps S111-S112 in the present invention;

[0071] Fig.15 is a flow chart of steps S113-S114 in the present invention;

[0072] Fig.16 is a flow chart of steps S210-S230 in the present invention;

[0073] Fig.17 is a flow chart of steps S221-S223 in the present invention;

[0074] Fig.18 is a flow chart of steps S231-S234 in the present invention;

[0075] The reference numerals and names in the figures are as follows:

[0076] Detection module-000, front image acquisition module-100, rear image acquisition module-200, cable core to be detected-001, first camera module-110, second camera module-210, first camera component-111, second camera component-112, first arc guide rail-113, oil brush component-120, third camera component-211, second arc guide rail-220. DETAILED DESCRIPTION

[0077] 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. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0078] See also Figure 1-18 , a method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable, comprising a detection module 000, wherein the detection module comprises a data processing module, a front image acquisition module 100 and a rear image acquisition module 200;

[0079] The front image acquisition module and the rear image acquisition module respectively move circumferentially around the cable core to be detected, and the data processing module is used to process the data acquired by the front image acquisition module and the rear image acquisition module;

[0080] The operation of the detection module includes the following steps:

[0081] S100: The cable core to be detected includes pitches S1, S2, ..., Sn arranged in sequence from front to back, the front image acquisition module includes a first camera module 110, the first camera module 110 performs a first circumferential movement φ1 around the cable core to be detected, the data processing module establishes a corresponding detection image P11 based on the image information of the pitch S1 acquired by the first camera module, the first circumferential movement φ1 of the first camera module corresponds to the linear movement forward of the cable core to be detected, so that the detection image P11 presents a continuous multi-row straight line structure, and so on, the detection images P12, ..., detection images P1n are obtained, and the first camera module cooperates with the feedback of the data processing module to perform circumferential and axial movement coordination;

[0082] S200: Based on the detection image P11, establish a priori model M1, and compare the detection images P12, ..., detection images P1n with the priori model;

[0083] S300: The rear image acquisition module includes a second camera module 210, and the second camera module 210 performs a second circumferential motion φ2 around the cable core to be detected. The data processing module establishes a corresponding detection image P21 based on the image information of the pitch S1 acquired by the second camera module. The second circumferential motion φ2 of the second camera module is differentially coordinated with the forward linear motion of the cable core to be detected, so that the detection image P21 presents a continuous segment structure, and so on, to obtain detection images P22, ..., detection images P2n, and the data processing module performs image analysis on the detection images P21, detection images P22, ..., detection images P2n respectively;

[0084] Taking the published patent "A cross-linked polyethylene cable" with publication number CN203433834U as reference document 1, as described in reference document 1, the cross-linked polyethylene cable is usually composed of a conductive core, an insulating layer and a filling layer, etc., which has good electrical properties and is widely used (paragraph 0002 of the specification), such as Figure 1 (Comparative Document 1 Figure 1) is one of the structures of the cross-linked polyethylene cable in the prior art, including a cable core, a filling layer, a mica tape layer, a cross-linked polyethylene insulation layer, a waterproof layer and a sheath layer; wherein, in the production process of the cable core, the published patent "A cross-linked polyethylene cable twisting device" with the announcement number CN211208100U is used as the comparative document 2. As described in the comparative document 2, the production of the cable core of the cross-linked polyethylene cable requires the use of a corresponding twisting device (paragraph 0003 of the specification), and the published patent "A cable alloy conductor twisting mold" with the announcement number CN208796727U is used as the comparative document 3. As described in the comparative document 3, in the cable production operation, multiple metal conductors are often prepared into a unified cable conductor through a twisting operation. When the conductors are twisted, they need to be twisted through a twisting die to improve the twisting efficiency and twisting accuracy. The current twisting die cannot effectively trim the surface of the conductor after twisting, resulting in a large number of cracks and other defects on the surface of the metal conductor caused by twisting deformation (paragraph 0002 of the specification). In summary, in the prior art, the cable core of the cross-linked polyethylene cable may cause cracks on the surface of the cable core during the twisting process, so it is necessary to detect the cable core after the twisting process to control the yield rate of the cable core twisting process and avoid abnormal breakage of the cable core during the cable laying process (there will be bending, dragging and other operation scenarios during the cable laying process) due to the presence of cracks. The broken cable core will pierce the insulation layer and protective layer covering the cable core from the inside, accelerating the corrosion of the cable;

[0085] like Figure 2 and Figure 3 The structure of the twisted cable core (twisted conductor) is shown, which is made by twisting multiple metal conductors in multiple layers. For the inspection of the finished twisted cable core, first, the cable core to be inspected is linearly transported forward. In S100, as shown in FIG. Figure 3 As shown, the cable core to be detected includes pitches S1, S2, ..., Sn arranged in sequence from front to back, and the front image acquisition module includes a first camera module, such as Figure 4 and Figure 5 As shown, the first camera module makes a first circumferential movement φ1 along the cable core to be detected. The data processing module establishes a corresponding detection map P11 based on the image information of the pitch S1 obtained by the first camera module, that is, the image of the pitch S1 obtained by the first camera module is grayed and binarized, and after noise reduction processing, the following is obtained: Figure 6 The grayscale image of the detection image P11 shown in FIG. Figure 4 , 5As shown in FIG. 6 , the plurality of metal conductors on the surface of the cable core to be detected are in a parallel spiral curve structure. When the first camera module is performing the first circumferential movement φ1, the cable core to be detected is linearly transmitted forward. By adapting the first circumferential movement φ1 of the first camera module to the linear movement forward of the cable core to be detected, the detection graph P11 is a continuous multi-row straight line structure, so that the detection graph P11 is convenient for plane graphic analysis, simplifies the steps of image analysis and improves the effect of image analysis. By analogy, detection graphs P12, ..., detection graphs P1n are obtained, thereby completing the detection of the entire cable core.

[0086] In S200, based on the detection graph P11, the prior model M1 is established. By establishing the prior model M1, the data comparison is made more efficient and accurate. The detection graphs P12, ..., and the detection graphs P1n are fitted and compared with the prior model M1 to determine the fitting conditions of the detection graphs P12, ..., and the detection graphs P1n. By comparing the fitting conditions, it is determined whether there are defects on the surface of the cable core.

[0087] In S300, if Figure 4 and Figure 7 As shown, the rear image acquisition module includes a second camera module, and the second camera module performs a second circumferential motion φ2 along the cable core to be detected. The data processing module establishes a corresponding detection map P21 based on the image information of the pitch S1 obtained by the second camera module, that is, grayscale processing and binarization processing are performed on the image of the pitch S1 obtained by the second camera module to obtain the following Figure 8 The grayscale image of the detection image P21 shown in FIG. Figure 4 , 5 As shown in Figure 6, the surface of the cable core to be detected is a parallel spiral curve structure. When the second camera module is performing the second circumferential movement φ2, the cable core to be detected is linearly transmitted forward. By differentially coordinating the second circumferential movement φ2 of the second camera module with the forward linear movement of the cable core to be detected, the detection image P21 is a continuous segment structure, so that the detection image P21 can contain more detailed information and the surface of the cable core can be detected and compared in multiple dimensions, making the detection effect more accurate. By analogy, the detection images P22, ..., detection images P2n are obtained, thereby completing the detection of the entire cable core;

[0088] In the present invention, the curved surface structure of the cable core surface is converted into a plane structure for detection, so that the detection process of the cable core is made more efficient. At the same time, multi-dimensional detection and comparison of the surface of the cable core is beneficial to improving the detection accuracy of the cable core visual detection. The invention is suitable for the detection of different types of cable cores and has a wider range of uses. In the production process of cable stranding, the stranded wires can be better detected to improve the production efficiency and yield of cable production. The detection efficiency of the stranded wire quality is high and the error is smaller, thereby improving the corrosion resistance of the cable core.

[0089] In the embodiment of the present invention, step S100 includes the following steps:

[0090] S110: The front image acquisition module further includes a first arc-shaped guide rail 113, and the first camera module 110 includes a first camera component 111 and a second camera component 112 arranged on the first arc-shaped guide rail, and the first camera component, the second camera component and the cable core to be detected are arranged in a colinear manner;

[0091] S120: The imaging range of the first camera component and the second camera component is larger than the diameter of the cable core to be detected;

[0092] S130: The speed at which the cable core 001 to be detected is uniformly transmitted forward linearly is recorded as v1, the pitch of the cable core is recorded as S, and the angular velocity of the first camera component and the second camera component performing the first circumferential motion φ1 is recorded as ω1, wherein the angular velocity ω1 follows the following calculation formula: ω1=360v1 / S;

[0093] In S110, if Figure 5 As shown, the first camera component and the second camera component make a first circumferential motion φ1 on the first arc guide rail. As shown in the published patent "A Pipe Butt Weld Ultrasonic Detection Device" with announcement number CN212568631U, the movement of the slider on the first arc guide rail is a disclosed technology in the prior art, so the movement structure of the first camera component and the second camera component on the first arc guide rail is not further elaborated here. During the first camera component and the second camera component make a first circumferential motion φ1 on the first arc guide rail, since the first camera component, the second camera component and the cable core to be detected are arranged in the same line, the first camera component performs image acquisition on one side of the cable, and the second camera component performs synchronous image acquisition on the other side of the cable. The first camera component and the second camera component perform complete image acquisition on the cable core.

[0094] In S120, if Figure 5 As shown, in order to ensure that the first camera component and the second camera component can completely capture the image of the cable core on their respective corresponding half sides, the camera range of the first camera component and the second camera component is set to be larger than the diameter of the cable core to be detected, thereby ensuring that the images of both sides of the cable core to be detected can be completely captured, ensuring the comprehensiveness of the overall detection;

[0095] In S130, if Figure 5 and Figure 6As shown, the linear uniform forward transmission rate of the cable core to be detected is recorded as v1, and the pitch of the cable core is recorded as S. Taking the first pitch S1 of the cable core as an example, it takes time t1 for the first camera device and the second camera device to pass through the pitch S1 of the cable core to be detected, t1=S1 / v1. In the process of the first camera device and the second camera device passing through the pitch S1 of the cable core to be detected, they need to circle around the cable core to be detected respectively. Therefore, within the time t1, the first camera device and the second camera device need to make a 360-degree circular motion. At the same time, the angular velocity of the first camera device and the second camera device is recorded as ω1, ω1=360 / t1=360 / S1 / v1, so ω1=360v1 / S1, and so on, when the first camera device making the first circumferential motion φ1 and the second camera device move at an angular velocity ω1, the first camera device and the second camera device can follow the linear motion forward of the cable core to be detected and adapt accordingly, and the surface of the cable core to be detected is a parallel spiral curve structure, and the first camera device and the second camera device can follow the progress of the spiral curve on the surface of the cable core to be detected, and synchronously perform circumferential image acquisition, so that the surface of the cable core to be detected with a parallel spiral curve structure can be converted into a planar continuous multi-row straight line structure, which is convenient for subsequent image analysis.

[0096] In the embodiment of the present invention, step S110 includes the following steps:

[0097] S111: A linear guide rail is arranged along the parallel direction of the cable core to be detected, and the first arc guide rail is slidably installed on the linear guide rail for axial displacement. When the image acquisition operation of the first camera component and the second camera component is in the process of the pitch Sn segment, if the data feedback of the data processing module is abnormal, then after the first camera component and the second camera component complete the detection of the current pitch Sn, the first arc guide rail is displaced axially forward for a time of t2, and the axial movement speed of the first arc guide rail is recorded as v2, v2>v1, and t2 follows the following calculation formula: t2=S(v2-v1);

[0098] S112: After the first arc-shaped guide rail moves forward in the axial direction for a predetermined time, the first camera component and the second camera component repeat step S130;

[0099] In S111, Figure 3As shown, during the daily operation of the first camera device and the second camera device for image acquisition, detection errors may occur due to the influence of ambient light and other environmental factors. In order to improve the detection precision and accuracy, when the image acquisition operation of the first camera device and the second camera device is in the process of the pitch Sn segment, when the data feedback of the data processing module is abnormal, the first camera device and the second camera device perform a secondary detection on the current pitch Sn. In order to facilitate positioning and ensure the integrity of the overall detection of the pitch Sn segment, the first camera device and the second camera device perform a secondary detection operation after completing the detection of the current pitch Sn. During the secondary detection, the axial movement speed of the first arc guide rail is recorded as v2. In order to ensure that the axial movement speed of the first arc guide rail can exceed the speed of the forward linear transmission of the cable core to be detected, v2>v1, a linear guide rail is arranged along the parallel direction of the cable core to be detected, and the first arc guide rail is installed on the linear guide rail for axial displacement. The moving distance and speed of the linear guide rail can be precisely controlled, so that the displacement of the first arc guide rail can be precisely controlled. The structure of the linear guide rail is a common structure in the prior art and is not further elaborated here.

[0100] The first arc guide moves forward along the axial direction for a time period of t2. Within the time period t2, the first arc guide needs to move forward along the axial direction for a distance of S. During the axial movement of the first arc guide, the cable core to be detected also moves forward linearly. Therefore, the relative speed of the first arc guide and the cable core to be detected along the axial direction is v2-v1, so t2=S(v2-v1);

[0101] In S112, after the first arc guide rail is displaced axially forward for a time period of t2, since the first camera component and the second camera component perform a secondary detection after completing the detection of the current pitch Sn, the current positions of the first camera component and the second camera component are the initial image acquisition positions, so the first camera component and the second camera component can repeat step S130;

[0102] The invention can improve detection accuracy and detection efficiency through secondary detection, and at the same time does not affect the normal processing operation of the cable core, has a wide range of applications and strong practicality.

[0103] In the embodiment of the present invention, the step S110 further includes the following steps:

[0104] S113: An oil brush 120 is also slidably mounted on the linear guide rail. The oil brush 120 is arranged in front of the first arc guide rail. The oil brush is fixedly connected to the first arc guide rail and the relative distance is less than S. When the image acquisition operation of the first camera component and the second camera component is in the process of the pitch Sn segment, when the data feedback of the data processing module is abnormal, after the first camera component and the second camera component complete the detection of the pitch Sn+1, the first arc guide rail moves forward axially for a time of t3, and at the same time, the oil brush starts to tighten and perform the oil brushing operation. The axial movement speed of the first arc guide rail is recorded as v3, v3>v1, and t3 follows the following calculation formula: t3=2S(v3-v1);

[0105] S114: After the first arc guide rail moves forward in the axial direction for a predetermined time, the oil brushing part is released to end the oil brushing operation, and the first camera part and the second camera part return to step S130;

[0106] As described in the published patent "A device for producing multi-strand cable core stranded wires" with publication number CN114974741A, by arranging a lubrication mechanism in the conductor hole, when the bare stranded wire passes through the conductor hole, the ball bearing is driven to rotate to bring the lubricating oil inside the groove out of the oil outlet channel to lubricate the bare stranded wire, thereby reducing the wear of the bare stranded wire at the conductor hole. At the same time, the lubricating oil can reduce the friction of the cable core in subsequent processing, which is convenient to use. In addition, by arranging a guide component in the cable collection hole, when multiple cable cores are twisted into one cable collection, the friction between the cable collection hole and the cable collection hole is reduced when the cable collection is sent out, thereby reducing the loss of the cable collection hole and the cable core.

[0107] As described in the published patent "A Cable Core Single Twist Twisting Machine" with announcement number CN221783017U, the coordinated arrangement of the oil brushing pipe and the oil box in the oil brushing mechanism can stably brush the core wire with oil, the coordinated arrangement of the block, the square frame, the slide and the tube brush can brush off excess lubricating oil, and can evenly brush the lubricating oil on the core wire, and the coordinated arrangement of the slide and the oil collecting trough can collect the lubricating oil dropped by the tube brush. When twisting the wire, the utility model can evenly brush the lubricating oil, can well protect the core wire, and can save lubricating oil, is simple to use, and is convenient to operate;

[0108] For example, as described in the published patent "An oil coating device for cable production" with announcement number CN219943394U, in the production process of cables and wires, it is necessary to apply a viscous protective oil on the surface of the cable core to ensure a certain adhesion between the cable core and the outer sheath. Traditional wire oiling uses a sponge to oil the surface of the wire, and after the ring-shaped sponge cover is immersed in a proper amount of oil, the cable core passes through the sponge cover, and then the oil in the sponge cover adheres to the cable core to complete the oiling;

[0109] To sum up, in the existing cable production, in the process of stranding, in order to ensure the quality of the stranded wire, lubricating oil is generally applied to the core wire, and the application of lubricating oil will cause a layer of lubricating oil film to be adhered to the finished wire core after the stranding process. Due to the existence of the oil film, during the image acquisition process of the wire core, due to the influence of ambient light, the reflection of the oil film and the uneven application of the oil film, errors will occur in the image acquisition of the first camera component and the second camera component. Therefore, in order to improve the detection precision and accuracy, in S113, when the data feedback of the data processing module is abnormal, the cable core is oiled for the second time by the oil brushing component, and the first camera component and the second camera component perform a second detection on the current pitch Sn, thereby reducing the interference of the oil film on the image acquisition. The oil brushing component is arranged in front of the first arc guide rail, such as Figure 4 As shown, in actual application, the oil brush occupies a certain space position and a certain space is reserved between the oil brush and the first arc guide rail for installation and disassembly, so there is a certain installation distance between the oil brush and the first arc guide rail. When the image acquisition operation of the first camera component and the second camera component has just completed the detection of the pitch Sn segment and begins to enter the pitch Sn+1, the oil brush has not completely passed the pitch Sn at this time, so after the first camera component and the second camera component complete the detection of the pitch Sn+1, they return to perform a secondary detection of the pitch Sn. At the same time, the relative distance between the oil brush and the first arc guide rail is less than S, so that the operation path of the oil brush can completely cover the pitch Sn;

[0110] The first arc-shaped guide rail moves forward in the axial direction for a time period of t3, and the axial movement speed of the first arc-shaped guide rail is recorded as v3. t3 follows the following calculation formula: t3=2S(v3-v1);

[0111] In S114, after the first arc-shaped guide rail moves forward axially for a predetermined time, the oil brushing part is released to end the oil brushing operation. The current positions of the first camera part and the second camera part are the initial image acquisition positions, so the first camera part and the second camera part can repeat step S130. The oil film on the cable core is made more uniform by the secondary oil brushing of the oil brushing part, thereby reducing the error in visual inspection.

[0112] It should be noted that, Figure 4 As shown, the oil brushing part includes a sleeve structure which is sleeved on the cable core to be tested, the sleeve structure is fixedly connected to the first arc-shaped guide rail, and an annular winding and loosening structure is also arranged inside the sleeve structure. The structure is realized by the existing technology and will not be further elaborated here.

[0113] In the embodiment of the present invention, the step S200 further includes the following steps:

[0114] S210: The detection image P11 includes a plurality of parallel strip lines and a plurality of parallel shadow lines between adjacent strip lines, and a priori model M1 is established based on the distribution and quantity of the plurality of strip lines and the plurality of shadow lines constituting the detection image P11;

[0115] S220: Establishing the prior model includes: determining the area of ​​the detection image P11;

[0116] Determine one of the plurality of strip-shaped lines that is located at the upper end or the lower end in the radial direction as the first conductor line X1, and fit a reference straight line X1' along the center line of X1;

[0117] Determine the first shadow line Y1 among the multiple shadow lines that fit X1, and fit a reference straight line Y1' along the center line of Y1;

[0118] Determine that the strip lines among the plurality of strip lines are aligned with Y1 and record them as the second conductor line X2, and fit a reference straight line X2' along the center line of X2;

[0119] Determine the shadow lines that fit X2 among the multiple shadow lines as the second shadow line Y2, and fit a reference straight line Y2' along the center line of Y2;

[0120] By analogy, we can obtain the prior model composed of reference straight lines, that is, the prior model = {X1', Y1', X2', ..., Yn'};

[0121] S230: Compare the detection images P12, ..., detection images P1n with {X1', Y1', X2', ..., Yn'} respectively;

[0122] In S210, if Figure 6 As shown, the detection image P11 includes a plurality of parallel strip lines X1 and a plurality of parallel shadow lines Y1 between adjacent strip lines X1, wherein the strip line X1 is a single metal conductor, and the shadow line Y1 is the gap between the metal conductors. Through grayscale processing and binarization processing, the detection image P11 is obtained as shown in FIG. Figure 6 The grayscale image of the detection diagram P11 shown in the figure is conducive to identification. By analyzing the strip line X1 and the shadow line Y1, the appearance analysis of the surface of the cable core can be performed. The purpose of establishing the prior model is to make the image comparison more in line with the actual production.

[0123] In S220, establishing the prior model includes: Figure 6As shown, by obtaining the grayscale image of the detection image P11, the area of ​​the detection image P1 is determined, and then one of the multiple strip-shaped lines at the upper end or the lower end in the radial direction is determined to be the first conductor line X1, and a reference straight line X1' is fitted along the center line of X1. The purpose of determining the reference straight line is to facilitate the comparison of subsequent detection images P12, ..., and detection images P1n. Because in the actual production process, the detection images P11, detection images P12, ..., and detection images P1n are not completely consistent, so in order to better compare the images and make the comparison more in line with the actual production, a reference straight line X1' is fitted from the detection image P11, and the reference straight line X1' is made more representative. The reference straight line X1' takes the center line of X1;

[0124] By sequentially capturing from top to bottom, a shadow line is attached to the bottom (or top) of X1, and the shadow line attached to X1 is determined as the first shadow line Y1, and a reference straight line Y1' is fitted along the center line of Y1. Similarly, the shadow line attached to Y1 is determined as the second conductor line X2, and a reference straight line X2' is fitted along the center line of X2. The shadow line attached to X2 is determined as the second shadow line Y2, and a reference straight line Y2' is fitted along the center line of Y2.

[0125] By analogy, a set of reference straight lines is obtained. The set of reference straight lines is the prior model, and the prior model includes X1', Y1', X2', ..., Yn';

[0126] In S230, the detection images P12, ..., detection images P1n are compared with the prior models {X1', Y1', X2', ..., Yn'} respectively, so that the image comparison can be performed accurately.

[0127] In the embodiment of the present invention, step S220 includes the following steps:

[0128] S221: After obtaining the prior model, according to step S220, obtain the comparison model 12 and the comparison model 13 from the detection images P12 and P13;

[0129] S222: Compare the comparison model 12 and the comparison model 13 with the prior model. If the comparison results are consistent, the prior model is qualified; otherwise, the prior model is unqualified.

[0130] S223: If the prior model is unsatisfactory, manual intervention is used to correct it;

[0131] In S221, since the prior model needs to be compared with the detection images P12, ..., detection images P1n, it is necessary to ensure the accuracy of the prior model and perform a secondary verification on the prior model. The verification method here includes detection images P12 and P13. According to step S220, the detection image P12 includes a plurality of parallel strip lines and a plurality of parallel shadow lines between adjacent strip lines. Based on the distribution and quantity of the plurality of strip lines and the plurality of shadow lines constituting the detection image P12, the prior model M12 is established. By analogy, the detection images P12 and P13 are processed by the data processing module to obtain the comparison model 12 and the comparison model 13.

[0132] In S222, the comparison model 12 and the comparison model 13 are compared with the prior model respectively. If the comparison results are consistent, it means that the prior model is representative and qualified. Otherwise, it means that the graphs of the test graphs P11, P12 and P13 are inconsistent, that is, the structures of the pitches S1, S2 and S3 on the cable core are inconsistent, and there is a high possibility of loose strands and other quality problems.

[0133] In one possibility, pitches S1, S2, and S3 all have loose strands or other quality problems, and the problems are consistent. However, in the actual production process, the probability of this happening is extremely small, and there will be manual assistance during the initial stranding process of the cable core, so this problem can be ignored.

[0134] In S223, if the prior model is unqualified, it means that there is a problem in the production process, which needs to be corrected by manual intervention.

[0135] In the embodiment of the present invention, step S230 includes the following steps:

[0136] S231: Determine the area of ​​the detection image P1n;

[0137] Determine that one of the multiple strip-shaped lines in the detection image P1n is at the upper end or the lower end in the radial direction and is recorded as X1n. X1' is offset upward by a distance L1 and then compared with the upper edge of X1n. X1' is offset downward by a distance L1 and then compared with the lower edge of X1n.

[0138] Determine that the shadow line that fits X1n among the multiple shadow lines is recorded as the first shadow line Y1n, Y1' is offset upward by a distance L2 and then compared with the upper edge of Y1n, and Y1' is offset downward by a distance L2 and then compared with the lower edge of Y1n;

[0139] Determine that the strip lines that fit Y1n are marked as second conductor lines X2n, X2' is offset upward by a distance L1 and then compared with the upper edge of X2n, and X2' is offset downward by a distance L1 and then compared with the lower edge of X2n;

[0140] Determine that the shadow line that fits X2n is recorded as the second shadow line Y2n, and Y2' is offset upward by a distance L2 and compared with the upper edge of Y2n, and Y2' is offset downward by a distance L2 and compared with the lower edge of Y2n;

[0141] And so on;

[0142] L1 is half of the standard diameter of the metal conductor, and L2 is half of the standard line gap of the metal conductor;

[0143] S232: During the comparison process, if the upper edge offset difference of X1n is equal to the lower edge, then proceed to step S233; if the upper edge offset difference of X1n is not equal to the lower edge, then proceed to step S234:

[0144] S233: Compare the upper edge offset value and the lower edge offset value of Y11. If the upper edge offset value and the lower edge offset value of Y1n are within the threshold range, the comparison is qualified. If the upper edge offset value and the lower edge offset value of Y11 are outside the threshold range, the comparison result is unqualified, and so on.

[0145] S234: If the upper edge offset difference and the lower edge offset value of X1n are both within the threshold range, the comparison is qualified; if either the upper edge offset difference and the lower edge offset value of X1n exceeds the threshold range, the comparison result is unqualified;

[0146] In S231, the detection image P1n is compared with the prior model, and the area of ​​the detection image P1n is first determined;

[0147] Determine one of the multiple strip lines that is at the upper end or the lower end in the radial direction and record it as X1n. X1' is offset upward by a distance of L1 and then compared with the upper edge of X1n. X1' is offset downward by a distance of L1 and then compared with the lower edge of X1n. Among them, L1 is half of the standard line width of the metal conductor, and L2 is half of the standard line gap. In the production process of the national standard 8.7 / 15kV cross-linked polyethylene cable, there are specific parameter specifications for the diameter of the metal conductor (i.e., one of the conductors in the stranded conductor), the diameter of the stranded conductor, and the compression coefficient. Therefore, for cables of different specifications, the standard diameter of the metal conductor and the standard line gap of the metal conductor have specific production standard reference values, that is, L1 and L2 are known numbers.

[0148] In S232 and S233, when comparing, if the upper edge offset difference of X1n is equal to the lower edge, it means that the metal conductor corresponding to X1n does not have a structural defect (groove or protrusion), but is offset upward or downward, then compare the upper edge offset value and the lower edge offset value of Y11. If the upper edge offset value and the lower edge offset value of Y11 are within the threshold range, it means that the metal conductor corresponding to X11 has a slight offset, but it does not affect the overall production requirements. Therefore, the comparison result is qualified. If the upper edge offset value and the lower edge offset value of Y11 are outside the threshold range, it means that the stranded conductor is loose, the overall production does not meet the standards, and the comparison result is unqualified.

[0149] If the upper edge offset difference of X2n is equal to the lower edge, it means that the metal conductor corresponding to X2n does not have a structural defect (groove or protrusion), but is offset upward or downward, then compare the upper edge offset value and the lower edge offset value of Y2n. If the upper edge offset value and the lower edge offset value of Y2n are within the threshold range, it means that the metal conductor corresponding to X2n has a slight offset, but it does not affect the overall production requirements. Therefore, the comparison result is qualified. If the upper edge offset value and the lower edge offset value of Y2n are outside the threshold range, it means that the stranded conductor is scattered and the overall production does not meet the standards. The comparison result is unqualified, and so on, and the subsequent comparison is completed;

[0150] In S232 and S234, if the upper edge offset difference of X1n is not equal to the lower edge, it means that there is at least one protrusion or defect on the metal conductor, resulting in an offset difference between the upper edge and the lower edge of X1n. If the upper edge offset difference and the lower edge offset value of X1n are both within the threshold range, it means that the protrusion or defect is within the threshold range, and the comparison is qualified. If any one of the upper edge offset difference and the lower edge offset value of X1n exceeds the threshold range, it means that the protrusion or defect exceeds the tolerance range, and the comparison result is unqualified.

[0151] The unqualified part in the test diagram P1n indicates that there is a production defect in the pitch Sn part on the cable core corresponding to the test diagram P1n.

[0152] In the embodiment of the present invention, step S300 includes the following steps:

[0153] S310: The rear image acquisition module further includes a second arc-shaped guide rail 220, and the second camera module includes a third camera component 211 disposed on the second arc-shaped guide rail. The angular velocity of the third camera component performing the second circumferential motion φ2 is recorded as ω2, wherein ω2>360v1 / S,

[0154] S320: The image acquisition of the third camera device includes a first local area and a second local area, and the third camera device focuses on and photographs the first local area and the second local area respectively, the first local area includes a single metal conductor located at the upper end, and the second local area includes a single metal conductor located at the lower end;

[0155] S330: Analyze the images of the first local area and the second local area respectively;

[0156] In S310, if Figure 7 As shown, the third camera device performs differential rotation around the cable core on the second arc-shaped guide rail, ω2>360v1 / S, and during the process that the third camera device passes through the pitch Sn of the cable core to be detected, the third camera device performs multiple turns around the pitch;

[0157] In S320 and S330, if Figure 7 As shown, the image acquisition of the third camera device includes a first local area and a second local area, and the third camera device includes a plurality of lenses, which focus on and shoot the first local area and the second local area respectively, the first local area includes a single metal conductor located at the upper end, and the second local area includes a single metal conductor located at the lower end;

[0158] like Fig. 9 , which is a schematic diagram of image acquisition by the first camera component and the second camera component. Fig.10 It is a schematic diagram of collecting images of a single metal conductor in the vertical direction f1 and the tangential direction f2. Since the images of the cable core collected by the first camera component and the second camera component are mainly in the a1 area perpendicular to the surface of the cable core, the first camera module is mainly used to detect the surface defects (depression and loose strands) of the cable core in the f1 direction, and the detection effect is limited. However, collecting images in the tangential direction f2 can better discover the defect information that cannot be collected by the first camera module.

[0159] like Fig.11 As shown, it is a local view of a single metal conductor at the upper end of the cable core. The third camera device can perform tangential detection on the area. Through tangential focus shooting and multi-dimensional image acquisition, more defect details can be found, thereby improving the accuracy of the detection results. For example, a hole defect on a metal conductor is detected as a hole in the tangential direction f2, but may appear as a thin line segment in the vertical direction f1. By increasing the speed of ω2, the tangential image of each metal conductor can be captured, thereby performing a more comprehensive detection.

[0160] In the embodiment of the present invention, step S320 includes the following steps:

[0161] S321: The lens of the third camera device is perpendicular to the bending direction of the metal conductor on the surface of the cable core to be detected;

[0162] like Figure 4 , 8 and Fig.11 As shown, the multiple metal conductors on the surface of the cable core to be tested are in a parallel spiral curve structure. Fig.11 Among them, L5 represents the axis of the cable core to be detected, and L6 represents the direction of the spiral bending of the metal conductor on the surface of the cable core to be detected. There is an angle α between the axis L5 of the cable core to be detected and the direction L6 of the spiral bending of the metal conductor. This causes the third camera device to sample the image of the surface of the cable core to be detected from the angle of f3, which will be at an angle with the diameter of the metal conductor. As mentioned above, when there is an angle, there will be deviations in image acquisition sampling. Therefore, in order to improve the accuracy of image sampling, the lens of the third camera device is perpendicular to the bending direction of the metal conductor on the surface of the cable core to be detected, that is, the third camera device is set in the direction of f3, so that the third camera device is better facing the side of the metal conductor, so that the image acquisition effect of the third camera device is better.

[0163] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable, characterized in that: The detection module includes a data processing module, a front image acquisition module and a rear image acquisition module; The front image acquisition module and the rear image acquisition module respectively move circumferentially around the cable core to be detected, and the data processing module is used to process the data acquired by the front image acquisition module and the rear image acquisition module; The operation of the detection module includes the following steps: S100: The cable core to be detected includes pitches S1, S2, ..., Sn arranged in sequence from front to back, the front image acquisition module includes a first camera module, the first camera module performs a first circumferential movement φ1 around the cable core to be detected, the data processing module establishes a corresponding detection image P11 based on the image information of the pitch S1 acquired by the first camera module, the first circumferential movement φ1 of the first camera module corresponds to the linear movement forward of the cable core to be detected, so that the detection image P11 presents a continuous multi-row straight line structure, and so on, the detection images P12, ..., detection images P1n are obtained, and the first camera module cooperates with the feedback of the data processing module to perform circumferential and axial movement coordination; S200: Based on the detection image P11, establish a priori model M1, and compare the detection images P12, ..., detection images P1n with the priori model; S300: The rear image acquisition module includes a second camera module, and the second camera module performs a second circumferential motion φ2 around the cable core to be detected. The data processing module establishes a corresponding detection image P21 based on the image information of the pitch S1 obtained by the second camera module. The second circumferential motion φ2 of the second camera module is differentially coordinated with the forward linear motion of the cable core to be detected, so that the detection image P21 has a continuous segment structure, and so on, to obtain detection images P22, ..., detection images P2n, and the data processing module performs image analysis on the detection images P21, detection images P22, ..., detection images P2n, respectively.

2. The method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable according to claim 1, characterized in that: The step S100 includes the following steps: S110: The front image acquisition module further includes a first arc-shaped guide rail, the first camera module includes a first camera component and a second camera component disposed on the first arc-shaped guide rail, and the first camera component, the second camera component and the cable core to be detected are disposed in a colinear manner; S120: The imaging range of the first camera component and the second camera component is larger than the diameter of the cable core to be detected; S130: The rate at which the cable core to be tested is transmitted forward linearly and uniformly is denoted as v1, the pitch of the cable core is denoted as S, and the angular velocity of the first camera component and the second camera component performing the first circumferential motion φ1 is denoted as ω1, wherein the angular velocity ω1 follows the following calculation formula: ω1=2πv1 / S.

3. The method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable according to claim 2, characterized in that: The step S110 includes the following steps: S111: A linear guide rail is arranged along the parallel direction of the cable core to be detected, and the first arc guide rail is slidably installed on the linear guide rail for axial displacement. When the image acquisition operation of the first camera component and the second camera component is in the process of the pitch Sn segment, if the data feedback of the data processing module is abnormal, then after the first camera component and the second camera component complete the detection of the current pitch Sn, the first arc guide rail is displaced axially forward for a time of t2, and the axial movement speed of the first arc guide rail is recorded as v2, v2>v1, and t2 follows the following calculation formula: t2=S / (v2-v1); S112: After the first arc-shaped guide rail is displaced axially forward for a predetermined time, the first camera component and the second camera component re-execute step S130.

4. The method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable according to claim 3, characterized in that: The step S110 further includes the following steps: S113: An oil brushing member is also slidably mounted on the linear guide rail, and the oil brushing member is arranged in front of the first arc guide rail. The oil brushing member is fixedly connected to the first arc guide rail and the relative distance is less than S. When the image acquisition operation of the first camera member and the second camera member is in the process of the pitch Sn segment, when the data feedback of the data processing module is abnormal, after the first camera member and the second camera member complete the detection of the pitch Sn+1, the first arc guide rail moves forward axially for a time of t3, and at the same time, the oil brushing member starts to tighten and perform the oil brushing operation. The axial movement speed of the first arc guide rail is recorded as v3, v3>v1, and t3 follows the following calculation formula: t3=2S / (v3-v1); S114: After the first arc-shaped guide rail is displaced axially forward for a predetermined time, the oil brushing component is released to end the oil brushing operation, and the first camera component and the second camera component re-execute step S130.

5. A method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable according to any one of claims 1 to 4, characterized in that: The step S200 further includes the following steps: S210: The detection image P11 includes a plurality of parallel strip lines and a plurality of parallel shadow lines between adjacent strip lines, and a priori model M1 is established based on the distribution and quantity of the plurality of strip lines and the plurality of shadow lines constituting the detection image P11; S220: Establishing the prior model includes: determining the area of ​​the detection image P11; Determine one of the plurality of strip-shaped lines that is located at the upper end or the lower end in the radial direction as the first conductor line X1, and fit a reference straight line X1' along the center line of X1; Determine the first shadow line Y1 among the multiple shadow lines that fit X1, and fit a reference straight line Y1' along the center line of Y1; Determine that the strip lines among the plurality of strip lines are aligned with Y1 and record them as the second conductor line X2, and fit a reference straight line X2' along the center line of X2; Determine the shadow lines that fit X2 among the multiple shadow lines as the second shadow line Y2, and fit a reference straight line Y2' along the center line of Y2; By analogy, we can obtain the prior model composed of reference straight lines, that is, the prior model = {X1', Y1', X2', ..., Yn'}; S230: Compare the detection images P12, ..., detection images P1n with {X1', Y1', X2', ..., Yn'} respectively.

6. The method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable according to claim 5, characterized in that: The step S220 includes the following steps: S221: After obtaining the prior model, according to step S220, obtain the comparison model 12 and the comparison model 13 from the detection images P12 and P13; S222: Compare the comparison model 12 and the comparison model 13 with the prior model. If the comparison results are consistent, the prior model is qualified; otherwise, the prior model is unqualified. S223: If the prior model is unsatisfactory, manual intervention is used to correct it.

7. The method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable according to claim 5, characterized in that: The step S230 includes the following steps: S231: Determine the area of ​​the detection image P1n; Determine that one of the multiple strip-shaped lines in the detection image P1n is at the upper end or the lower end in the radial direction and is recorded as X1n. X1' is offset upward by a distance L1 and then compared with the upper edge of X1n. X1' is offset downward by a distance L1 and then compared with the lower edge of X1n. Determine that the shadow line that fits X1n among the multiple shadow lines is recorded as the first shadow line Y1n, Y1' is offset upward by a distance L2 and then compared with the upper edge of Y1n, and Y1' is offset downward by a distance L2 and then compared with the lower edge of Y1n; Determine that the strip lines that fit Y1n are marked as second conductor lines X2n, X2' is offset upward by a distance L1 and then compared with the upper edge of X2n, and X2' is offset downward by a distance L1 and then compared with the lower edge of X2n; Determine that the shadow line that fits X2n is recorded as the second shadow line Y2n, and Y2' is offset upward by a distance L2 and compared with the upper edge of Y2n, and Y2' is offset downward by a distance L2 and compared with the lower edge of Y2n; And so on; L1 is half of the standard diameter of the metal conductor, and L2 is half of the standard line gap of the metal conductor; S232: During the comparison process, if the upper edge offset difference of X1n is equal to the lower edge, then proceed to step S233; if the upper edge offset difference of X1n is not equal to the lower edge, then proceed to step S234: S233: Compare the upper edge offset value and the lower edge offset value of Y11. If the upper edge offset value and the lower edge offset value of Y1n are within the threshold range, the comparison is qualified. If the upper edge offset value and the lower edge offset value of Y11 are outside the threshold range, the comparison result is unqualified, and so on. S234: If the upper edge offset difference and the lower edge offset value of X1n are both within the threshold range, the comparison is qualified; if either the upper edge offset difference and the lower edge offset value of X1n exceeds the threshold range, the comparison result is unqualified.

8. The method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable according to claim 2, characterized in that: The step S300 includes the following steps: S310: The rear image acquisition module further includes a second arc-shaped guide rail, and the second camera module includes a third camera component disposed on the second arc-shaped guide rail. The angular velocity of the third camera component performing the second circumferential motion φ2 is recorded as ω2, wherein ω2>2πv1 / S, S320: The image acquisition of the third camera device includes a first local area and a second local area, and the third camera device focuses on and photographs the first local area and the second local area respectively, the first local area includes a single metal conductor located at the upper end, and the second local area includes a single metal conductor located at the lower end; S330: Analyze the images of the first local area and the second local area respectively.

9. The method for preparing a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable according to claim 8, characterized in that: The step S320 includes the following steps: S321: The lens of the third camera device is perpendicular to the bending direction of the metal conductor on the surface of the cable core to be detected.

10. A corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable, characterized in that: The production of the cable adopts the preparation method of a corrosion-resistant 8.7 / 15kV cross-linked polyethylene cable as described in any one of claims 1-9.

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