A method for producing cable insulation core wire based on adjustable heating power

Abstract

This invention relates to the field of cable manufacturing technology, and more particularly to a method for producing cable insulation core wire based on adjustable heating power. The method includes: subjecting the extruded core wire to non-periodic infrared heating treatment in a heating chamber to obtain cable insulation core wire; calculating the fluctuation suppression rate of the cable insulation core wire based on the outer diameter sequence of the extruded core wire and the outer diameter sequence of the cable insulation core wire; determining whether the production of the cable insulation core wire meets a preset standard based on the fluctuation suppression rate; when the production of the cable insulation core wire does not meet the preset standard based on the fluctuation suppression rate, determining a handling strategy for when the production of the cable insulation core wire does not meet the preset standard based on the grayscale range of the core wire cross-section; and winding up the cable insulation core wire that meets the preset standard. This invention improves the production efficiency of cable insulation core wire.

Description

Technical Field

[0001] This invention relates to the field of cable manufacturing technology, and in particular to a method for producing cable insulation core wires based on adjustable heating power. Background Technology

[0002] The insulated core of a cable is its core functional unit, mainly composed of a conductor and an insulation layer. The conductor is typically made of copper, aluminum, or their alloys, and can be a single solid wire or multiple strands twisted together. Its core function is to serve as a directional transmission channel for current or signals. The insulation layer uses high-molecular materials with excellent electrical insulation properties, such as polyethylene, polyvinyl chloride, and cross-linked polyethylene. It is extruded and uniformly coated onto the conductor surface, blocking electrical connections between the conductor and the external environment or other conductors to prevent leakage and short circuits, ensuring safety. It also protects the conductor from mechanical wear, chemical corrosion, and environmental aging. While the insulated core is the functional foundation of a cable, it is not the final product. Single-core cables are sheathed to form a complete product, while multi-core cables consist of multiple insulated cores of different specifications twisted together and then covered with a common sheath. The choice of insulation material and the precision of the sheathing directly determine the cable's insulation performance, transmission efficiency, and service life, and are crucial for the cable's safe and stable operation.

[0003] However, even with strict specifications for the dimensions of the inner conductor, insulation, and outer conductor of the cable, and with the diameter tolerance range already near its limit, requiring uniformity of all materials, and with the precision and matching of the production molds reaching the limits of current technology, the coaxial cables produced still exhibit standing wave peaks. The primary reason for this is a tiny, periodic fluctuation in the impedance formed by the core wire. This fluctuation appears so small that the core wire size, capacitance, and impedance all fall within the required fluctuation range, making it undetectable during core wire production. It only becomes apparent during cable performance testing after the outer conductor is processed to form the coaxial cable structure. The root cause of the standing wave peak lies in the core wire production process. The core wire is formed by the insulation material and inner conductor being pulled by a traction machine using a mold. Because the traction machine has an inherent fixed frequency, this fixed frequency easily causes a periodic change in the traction speed. Consequently, the core wire also undergoes periodic changes during the periodic traction process, resulting in a periodic change in the coaxial cable impedance. This periodic accumulation of changes forms the standing wave peak of the coaxial cable, severely affecting signal transmission quality.

[0004] Chinese Patent Application Publication No. CN104240857A discloses a mold and a manufacturing process for insulated wire cores. The mold includes a first mold core mounted on a machine head for producing a first conductor, and a second mold core fixed on a second conductor. The second mold core is fixed at the end of the second conductor that enters the machine head. The second mold core moves with the second conductor toward the machine head and enters the interior of the first mold core. The outer wall of the second mold core fits against the inner wall of the first mold core to form a first integral mold.

[0005] It can be seen that the above technical solution does not take into account the impact of the periodic vibration of the traction machine on the core wire performance, thus resulting in poor core wire preparation efficiency. Summary of the Invention

[0006] Therefore, the present invention provides a method for producing cable insulation core wire based on adjustable heating power, in order to overcome the problem that the existing technology does not consider the impact of the periodic vibration of the traction machine on the core wire performance, resulting in poor core wire production efficiency.

[0007] To achieve the above objectives, the present invention provides a method for producing cable insulation core wire based on adjustable heating power, comprising:

[0008] Polyethylene is extruded and coated onto copper wire to obtain an extruded core wire. Several outer diameters of the extruded core wire are collected at preset collection intervals, covering several vibration cycles of the traction machine, to obtain a sequence of outer diameters of the extruded core wire.

[0009] The extruded core wire is subjected to non-periodic infrared heating treatment in a heating chamber to obtain a cable insulation core wire. Several outer diameters of the cable insulation core wire of a preset length are collected at preset collection intervals to obtain a sequence of outer diameters of the cable insulation core wire.

[0010] The fluctuation suppression rate of the cable insulation core wire is obtained based on the outer diameter sequence of the extruded core wire and the outer diameter sequence of the cable insulation core wire; the fluctuation suppression rate is used to determine whether the production of the cable insulation core wire meets the preset standard.

[0011] When the production of the cable insulation core wire does not meet the preset standard based on the fluctuation suppression rate, the processing strategy for the non-compliance of the cable insulation core wire production is determined based on the gray scale difference of the core wire cross-section. The processing strategy is to increase the heating power of the heating chamber or stop heating and issue an alarm.

[0012] The cable insulation core wires that meet the preset standards are wound up.

[0013] Furthermore, based on the comparison results of the fluctuation suppression rate of the cable insulation core being greater than or equal to the first preset fluctuation suppression rate, it is determined that the production of the cable insulation core meets the preset standard.

[0014] Furthermore, when it is determined that the production of the cable insulation core wire meets the preset standard based on the comparison result of the fluctuation suppression rate being greater than or equal to the second preset fluctuation suppression rate, the production of the cable insulation core wire meets the preset standard again based on the gray standard deviation of the cable insulation core wire, wherein the first preset fluctuation suppression rate is less than the second preset fluctuation suppression rate.

[0015] Furthermore, the determination that the production of the cable insulation core wire does not meet the preset standard is based on the comparison result of the fluctuation suppression rate being less than the first preset fluctuation suppression rate, and the handling strategy when the production of the cable insulation core wire does not meet the preset standard is determined according to the gray scale range of the core wire cross-section.

[0016] Furthermore, the process of obtaining the volatility suppression rate includes:

[0017] Before infrared heating, several outer diameter data of the extruded core wire are collected at preset acquisition intervals, covering several vibration cycles of the traction machine, to obtain the outer diameter sequence of the extruded core wire.

[0018] Spectral analysis was performed on the outer diameter sequence of the extruded core wire, and the amplitude of the characteristic frequency peak corresponding to the traction machine vibration frequency in its spectrum was extracted and denoted as the first amplitude.

[0019] After infrared heating, the outer diameter sequence of the cable insulation core was collected in the same way, and the spectrum analysis of the outer diameter sequence of the cable insulation core was performed to extract the amplitude at the same characteristic frequency, which was recorded as the second amplitude.

[0020] The difference between the first amplitude and the second amplitude is recorded as the fluctuation deviation value;

[0021] The ratio of the fluctuation deviation value to the first amplitude is denoted as the fluctuation suppression rate.

[0022] Furthermore, based on the comparison result that the gray standard deviation of the cable insulation core is greater than or equal to the preset gray standard deviation, it is determined for the second time that the production of the cable insulation core does not meet the preset standard, and the traction rate of the core wire in the next batch is reduced according to the difference between the gray standard deviation and the preset gray standard deviation, wherein the gray standard deviation is the standard deviation of the gray values ​​of all pixels in the infrared thermal image of the cable insulation core along the length direction.

[0023] Furthermore, several rate adjustment methods are provided for reducing the traction rate, and each rate adjustment method reduces the traction rate by a different amount.

[0024] Furthermore, the process of determining the handling strategy when the cable insulation core cross-section does not meet the preset standard based on the grayscale range includes:

[0025] The grayscale range of the core wire cross section is compared with the preset grayscale range;

[0026] If the grayscale range is less than the preset grayscale range, the heating power of the heating cavity is increased according to the difference between the preset grayscale range and the grayscale range.

[0027] If the grayscale difference is greater than or equal to the preset grayscale difference, heating will stop and an alarm will be issued.

[0028] Furthermore, the process of obtaining the grayscale range of the cross-section of the insulated core wire of the cable includes:

[0029] Obtain an infrared thermogram of the cross-section of the cable's insulated core wire;

[0030] In the circumferential direction of the infrared thermal image, the gray values ​​of several uniformly distributed pixels are collected.

[0031] Obtain the maximum and minimum grayscale values ​​among the given grayscale values;

[0032] The difference between the maximum gray value and the minimum gray value is denoted as the gray range.

[0033] Furthermore, the increase in the heating power of the heating cavity is positively correlated with the grayscale deviation value, wherein the grayscale deviation value is the difference between the preset grayscale range and the grayscale range.

[0034] Compared with existing technologies, the beneficial effects of this invention are as follows: by employing a non-periodic infrared heating post-processing technique to disrupt the microscopically periodically non-uniform surface of the core wire, the original periodic fluctuations of the insulated core wire are broken, thereby improving the signal transmission performance of the radio frequency coaxial cable prepared from the insulated core wire. At the same time, a multi-level, multi-parameter collaborative intelligent closed-loop core wire production control system is constructed. This system does not rely on a single parameter for judgment, but comprehensively utilizes multi-dimensional data information such as fluctuation suppression rate, grayscale standard deviation, and grayscale range to perform intelligent adaptive control and decision-making of the production process. Based on different judgment results, it automatically executes corresponding optimization strategies, thereby improving the core wire production efficiency.

[0035] Furthermore, this invention introduces a tiered judgment logic that compares the fluctuation suppression rate with a first preset fluctuation suppression rate and a second preset fluctuation suppression rate, clarifying that the fluctuation suppression rate needs to be within a reasonable range to be considered optimal. On the one hand, setting the fluctuation suppression rate to be greater than or equal to the first preset fluctuation suppression rate ensures that the periodic fluctuations of the core wire have been effectively eliminated, meeting the basic requirements for the impedance stability of downstream cables and avoiding standing wave hazards caused by residual fluctuations. On the other hand, setting the fluctuation suppression rate to be less than the second preset fluctuation suppression rate prevents the excessive pursuit of a high fluctuation suppression rate and the blind increase of heating power, avoiding carbonization and embrittlement of the insulation layer due to excessive heating, or oxidation of the inner conductor, thus balancing the relationship between fluctuation elimination effect and core wire material protection, thereby improving the reliability of the evaluation.

[0036] Furthermore, for high suppression rate scenarios where the fluctuation suppression rate is greater than or equal to the second preset fluctuation suppression rate, the present invention introduces grayscale standard deviation for secondary judgment, avoiding the assumption that high fluctuation suppression rate is acceptable and ignoring heating damage, thereby improving the level of intelligence in production process monitoring.

[0037] Furthermore, by setting a fluctuation suppression rate, this invention accurately extracts the characteristic frequency amplitude corresponding to the jitter frequency of the traction machine through spectrum analysis and calculates its relative rate of change. This can isolate the periodic fluctuations caused by jitter and effectively filter out other random interferences. The fluctuation suppression rate truly reflects the ability of infrared heating treatment to suppress specific disturbance sources, thereby improving the accuracy of core wire quality assessment.

[0038] Furthermore, by associating the determination result of grayscale standard deviation with the adjustment of production process parameters, the present invention automatically reduces the traction rate of the next batch when the grayscale standard deviation indicates uneven axial heating, thereby increasing the heating time of the material in the heating chamber and improving uniformity by increasing the core wire heating time, thus improving production efficiency. Attached Figure Description

[0039] Figure 1 This is a flowchart of a cable insulation core production method based on adjustable heating power, according to an embodiment of the present invention.

[0040] Figure 2 This is a flowchart illustrating how the production of the cable insulation core wire conforms to a preset standard based on the fluctuation suppression rate of the cable insulation core wire, as described in an embodiment of the present invention.

[0041] Figure 3 This is a flowchart illustrating a secondary determination of whether the production of the cable insulation core wire conforms to a preset standard based on the gray standard deviation of the cable insulation core wire in an embodiment of the present invention.

[0042] Figure 4 This is a schematic diagram of the standing wave test results of a coaxial cable made of core wires without infrared heating treatment according to an embodiment of the present invention.

[0043] Figure 5 This is a schematic diagram of the standing wave test results of a coaxial cable made of core wires that have undergone infrared heating treatment, according to an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0045] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0046] It should be noted that the data in this embodiment are all derived from a comprehensive analysis and evaluation of historical test data and corresponding historical test results from the three months prior to this test. Those skilled in the art will understand that the method described in this invention can determine the above-mentioned parameters in the following ways: selecting the value with the highest proportion based on the data distribution as the preset standard parameter; using weighted summation to obtain the value as the preset standard parameter; substituting each historical data point into a specific formula and using the value obtained by that formula as the preset standard parameter; or other selection methods, as long as the method described in this invention can clearly define different specific situations in the single-item judgment process through the obtained values.

[0047] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 5 The diagrams shown are, respectively, flowcharts of a cable insulation core wire production method based on adjustable heating power according to an embodiment of the present invention; a flowchart of determining whether the production of the cable insulation core wire meets a preset standard based on the fluctuation suppression rate of the cable insulation core wire according to an embodiment of the present invention; a flowchart of determining whether the production of the cable insulation core wire meets a preset standard based on the grayscale standard deviation of the cable insulation core wire according to an embodiment of the present invention; a schematic diagram of the standing wave test results of a coaxial cable made from core wires without infrared heating treatment according to an embodiment of the present invention; and a schematic diagram of the standing wave test results of a coaxial cable made from core wires with infrared heating treatment according to an embodiment of the present invention.

[0048] This invention provides a method for producing cable insulation core wire based on adjustable heating power, comprising:

[0049] Step S1: A 1.0 mm diameter silver-plated copper wire is introduced into the extruder head through the wire feeding frame. The traction machine is started at a preset traction rate of 15 m / min, and the screw speed of the extruder is adjusted to 40 r / min to make the molten polyethylene uniformly coat the copper wire, thereby obtaining the extruded core wire. A laser diameter measuring instrument is used to collect several outer diameters of the extruded core wire at a preset collection interval of 0.15 mm, covering several vibration cycles of the traction machine, to obtain the outer diameter sequence of the extruded core wire.

[0050] Step S2: The extruded core wire is subjected to non-periodic infrared heating treatment through a heating chamber to obtain a cable insulation core wire. Several outer diameters of the cable insulation core wire of a preset length are collected at a preset sampling interval of 0.15mm to obtain the outer diameter sequence of the cable insulation core wire.

[0051] Step S3: Calculate the fluctuation suppression rate of the cable insulation core wire based on the outer diameter sequence of the extruded core wire and the outer diameter sequence of the cable insulation core wire; determine whether the production of the cable insulation core wire meets the preset standard based on the fluctuation suppression rate.

[0052] Step S4: When it is determined that the production of the cable insulation core wire does not meet the preset standard based on the fluctuation suppression rate, the processing strategy for the cable insulation core wire production not meeting the preset standard is determined based on the gray scale range of the core wire cross-section. The processing strategy is to increase the heating power of the heating chamber or stop heating and issue an alarm.

[0053] Step S5: The cable insulation core wire that meets the preset standard is wound up for subsequent processing into a coaxial cable.

[0054] In this embodiment, for the insulated core wire of the FSC400 radio frequency coaxial cable, the inner conductor is a copper wire with a diameter of 1.0 mm, and the insulation layer is polyethylene with a target outer diameter of 3.5 mm.

[0055] In this embodiment, the vibration cycle length of the traction machine refers to the length of the core wire corresponding to a complete periodic fluctuation in the traction speed caused by the inherent vibration of the traction machine. The vibration cycle length of the traction machine is the ratio of the traction rate to the inherent vibration frequency of the traction machine, wherein the inherent vibration frequency of the traction machine is measured by an acceleration sensor installed on the traction machine; the vibration cycle length of the traction machine refers to the length of the core wire corresponding to a complete periodic fluctuation in the traction speed caused by the inherent vibration of the traction machine.

[0056] In this embodiment, preferably, the jitter period is selected as 10 cycles.

[0057] In this embodiment, an infrared heater is installed inside the heating cavity to perform non-periodic infrared heating treatment. Its fundamental frequency is 3 GHz, and it is non-periodicly modulated with a time variable t. The modulation function is f. t = (f0+t), where t is in seconds. The time is reset every 1000 seconds to ensure that the heating frequency does not have a periodicity related to traction jitter. Since the normal operating frequency of coaxial cable is DC-3GHz, f0=3GHz.

[0058] In this embodiment, the heating power of the heating chamber is set to 8kW.

[0059] Specifically, the production of the cable insulation core wire is determined to meet a preset standard based on the fluctuation suppression rate of the insulation core wire.

[0060] If the fluctuation suppression rate is less than the first preset fluctuation suppression rate of 0.45, it is determined that the production of the cable insulation core wire does not meet the preset standard, and the handling strategy when the production of the cable insulation core wire does not meet the preset standard is determined according to the gray scale range of the core wire cross-section.

[0061] If the fluctuation suppression rate is greater than or equal to the first preset fluctuation suppression rate and less than the second preset fluctuation suppression rate of 0.75, then the production of the cable insulation core wire is determined to meet the preset standard.

[0062] If the fluctuation suppression rate is greater than or equal to the second preset fluctuation suppression rate, it is determined that the production of the cable insulation core wire meets the preset standard, and the production of the cable insulation core wire meets the preset standard again based on the gray standard deviation of the cable insulation core wire.

[0063] Wherein, the first preset fluctuation suppression rate is less than the second preset fluctuation suppression rate.

[0064] Specifically, the first preset volatility suppression rate ranges from [0.25, 0.55], and the second preset volatility suppression rate ranges from [0.60, 0.90]. Preferably, the first preset volatility suppression rate is 0.45 and the second preset volatility suppression rate is 0.75.

[0065] Specifically, a fluctuation suppression rate was set to quantitatively evaluate the effect of infrared heating process on suppressing the periodic fluctuations in outer diameter caused by traction machine vibration.

[0066] Specifically, if the fluctuation suppression rate is less than the first preset fluctuation suppression rate, the characteristic frequency peak amplitude of the core wire is not sufficiently eliminated, and the residual fluctuation intensity is too high. That is, the periodic fluctuation of the core wire is not eliminated even after non-periodic heating, and a standing wave peak appears in the use of the manufactured coaxial cable. If the fluctuation suppression rate is greater than or equal to the second preset fluctuation suppression rate, it indicates that the periodic fluctuation of the core wire is broken at this time, and the risk of standing wave peak formation is extremely low. However, a high fluctuation suppression rate is prone to local uneven heating. The heating uniformity is verified by a second judgment through grayscale standard deviation.

[0067] Specifically, the process of obtaining the volatility suppression rate includes:

[0068] Before infrared heating, several outer diameter data of the extruded core wire are collected at a preset acquisition interval of 0.15mm, covering several vibration cycles of the traction machine, to obtain the outer diameter sequence of the extruded core wire.

[0069] Spectral analysis was performed on the outer diameter sequence of the extruded core wire, and the amplitude of the characteristic frequency peak corresponding to the traction machine vibration frequency in its spectrum was extracted and denoted as the first amplitude.

[0070] After infrared heating, the outer diameter sequence of the cable insulation core was collected in the same way, and the spectrum analysis of the outer diameter sequence of the cable insulation core was performed to extract the amplitude at the same characteristic frequency, which was recorded as the second amplitude.

[0071] The difference between the first amplitude and the second amplitude is recorded as the fluctuation deviation value;

[0072] The ratio of the fluctuation deviation value to the first amplitude is denoted as the fluctuation suppression rate.

[0073] Specifically, the production of the cable insulation core wire is determined twice based on the grayscale standard deviation of the core wire to determine whether it meets the preset standard.

[0074] If the grayscale standard deviation is less than the preset grayscale standard deviation of 18, it is determined that the production of the cable insulation core wire meets the preset standard.

[0075] If the grayscale standard deviation is greater than or equal to the preset grayscale standard deviation, it is determined that the production of the cable insulation core wire does not meet the preset standard, and the traction rate of the core wire in the next batch is reduced according to the difference between the grayscale standard deviation and the preset grayscale standard deviation. Herein, the grayscale standard deviation is the standard deviation of the grayscale values ​​of all pixels in the infrared thermal image of the cable insulation core wire along the length direction. In this embodiment, the infrared thermal image is obtained by an infrared thermal imager, and the grayscale values ​​of the pixels are obtained by image processing software. In this embodiment, OpenCV is selected as the image processing software.

[0076] Specifically, the preset grayscale standard deviation is 18, but the above value is not limited to this, and those skilled in the art can adjust the value according to actual needs.

[0077] Specifically, the insulation layer of the core wire is made of plastic. The uniformity of heating of the insulation layer directly determines whether the core wire characteristics are qualified. The dielectric constant and mechanical properties of plastic are sensitive to temperature fluctuations. Local overheating can easily lead to carbonization and embrittlement. The gray scale standard deviation quantifies the uniformity of heating of the core wire in the length direction. If the gray scale standard deviation is greater than or equal to the preset gray scale standard deviation, it indicates that the heating is uneven.

[0078] Specifically, several rate adjustment methods are provided to address the reduction in the traction rate, among which,

[0079] If the grayscale standard deviation value is less than the first preset grayscale standard deviation value of 8, then the traction rate is reduced to the corresponding value using the first adjustment coefficient of 0.96.

[0080] If the grayscale standard deviation value is greater than or equal to the first preset grayscale standard deviation value and less than the second preset grayscale standard deviation value of 15, then the traction rate is reduced to the corresponding value using the second adjustment coefficient of 0.94.

[0081] If the grayscale standard deviation value is greater than or equal to the second preset grayscale standard deviation value, then the traction rate is reduced to the corresponding value using the third adjustment coefficient of 0.92.

[0082] The grayscale standard deviation value is the difference between the grayscale standard deviation and the preset grayscale standard deviation.

[0083] Specifically, the process of determining the handling strategy when the cable insulation core cross-section does not meet the preset standard based on the grayscale range includes:

[0084] The grayscale range of the core wire cross section is compared with the preset grayscale range 45;

[0085] If the grayscale range is less than the preset grayscale range, the heating power of the heating cavity is increased according to the difference between the preset grayscale range and the grayscale range.

[0086] If the grayscale difference is greater than or equal to the preset grayscale difference, heating will stop and an alarm will be issued.

[0087] Specifically, the preset grayscale range is 45, but the above value is not limited to this, and those skilled in the art can adjust the value according to actual needs.

[0088] Specifically, on the same cross-section of the core wire, the grayscale difference directly reflects the uniformity of the insulation layer under heating in the circumferential direction.

[0089] Specifically, the processing strategy based on the grayscale range of the core wire cross-section is only implemented when the current core wire production fails to meet the preset standard based on the fluctuation suppression rate. This avoids process redundancy caused by indiscriminate judgment. If the grayscale range is less than the preset grayscale range, it indicates that although the temperature distribution in the circumferential direction of the core wire cross-section is not uniform, the difference is still within a controllable range. This situation usually stems from the heating power of the heating chamber being insufficient to completely suppress the periodic fluctuations caused by traction jitter. Increasing the heating power can improve the fluctuation suppression effect. If the grayscale range is greater than or equal to the preset grayscale range, it indicates that there is severe temperature differentiation on the core wire cross-section. If the power is further increased in this case, it will only aggravate local overheating, leading to insulation layer burns or even melting, while the improvement in the low-temperature area may be limited. Therefore, stopping heating and immediately issuing an alarm is the only safe and reasonable strategy.

[0090] Specifically, the process of obtaining the grayscale range of the cross-section of the cable insulation core wire includes:

[0091] Infrared thermal imagers are used to obtain infrared thermal images of the cross-section of the cable insulation core wire. The outer circle contour of the core wire cross-section is identified by the Canny edge detection algorithm. The center coordinates and radius of the minimum circumcircle or fitted circle of the outer circle are calculated. Several rays are emitted from the center at equal intervals of 10°.

[0092] Collect and read the grayscale value of the pixel at the intersection of each ray and the outer circle;

[0093] Obtain the maximum and minimum grayscale values ​​among the given grayscale values;

[0094] The difference between the maximum gray value and the minimum gray value is denoted as the gray range.

[0095] Specifically, the increase in heating power of the heating cavity is positively correlated with the grayscale deviation value. The positive correlation can be linear or nonlinear. The slope of the linear positive correlation is not specifically limited. It can be understood that the larger the grayscale deviation value, the greater the increase in heating power of the heating cavity. The grayscale deviation value is the difference between the preset grayscale range and the grayscale range.

[0096] Specifically, in comparison Figure 4 and Figure 5 It can be seen that, under completely identical test conditions, the standing wave ratio of the FSC400 RF coaxial cable can be optimized from having obvious peaks to having no peaks by simply using the key step of non-periodic infrared heating treatment of the core wire in this invention. This proves that the technical solution of this invention to improve the standing wave characteristics of the cable by breaking the periodic fluctuation of the core wire is effective and practical.

[0097] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0098] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for producing a cable insulated core wire based on heating power adjustment, characterized by, The method comprises the following steps: extruding polyethylene onto copper wire to obtain an extruded core wire, collecting the outer diameter of the extruded core wire covering several lengths of the jitter cycle of the traction machine at a preset collection interval to obtain an outer diameter sequence of the extruded core wire; performing non-periodic infrared heating treatment on the extruded core wire through a heating cavity to obtain a cable insulation core wire, collecting the outer diameter of the cable insulation core wire of a preset length at a preset collection interval to obtain an outer diameter sequence of the cable insulation core wire; determining the fluctuation suppression rate of the cable insulation core wire according to the outer diameter sequence of the extruded core wire and the outer diameter sequence of the cable insulation core wire, and determining whether the production of the cable insulation core wire meets the preset standard according to the fluctuation suppression rate; when it is determined that the production of the cable insulation core wire does not meet the preset standard according to the fluctuation suppression rate, determining the processing strategy when the production of the cable insulation core wire does not meet the preset standard according to the gray level range of the core wire section of the cable insulation core wire, wherein the processing strategy is to increase the heating power of the heating cavity or to stop heating and issue an alarm; winding the cable insulation core wire meeting the preset standard; The process of obtaining the fluctuation suppression rate comprises the following steps: collecting the outer diameter data of the extruded core wire covering several lengths of the jitter cycle of the traction machine at a preset collection interval before infrared heating to obtain an outer diameter sequence of the extruded core wire; performing frequency spectrum analysis on the outer diameter sequence of the extruded core wire to extract the amplitude of the characteristic frequency peak corresponding to the traction machine jitter frequency in the frequency spectrum, which is recorded as the first amplitude; after infrared heating, collecting the outer diameter sequence of the cable insulation core wire in the same way, and performing frequency spectrum analysis on the outer diameter sequence of the cable insulation core wire to extract the amplitude at the same characteristic frequency, which is recorded as the second amplitude; the difference between the first amplitude and the second amplitude is recorded as the fluctuation deviation value; the ratio of the fluctuation deviation value to the first amplitude is recorded as the fluctuation suppression rate.

2. The method for producing a cable insulated core wire based on heating power adjustment according to claim 1, characterized by, When the fluctuation suppression rate of the cable insulation core wire is greater than or equal to the first preset fluctuation suppression rate, it is determined that the production of the cable insulation core wire meets the preset standard according to the comparison result.

3. The method for producing a cable insulated core wire based on heating power adjustment according to claim 2, characterized by, When it is determined that the production of the cable insulation core wire meets the preset standard according to the comparison result that the fluctuation suppression rate is greater than or equal to the second preset fluctuation suppression rate, it is determined whether the production of the cable insulation core wire meets the preset standard according to the gray level standard deviation of the cable insulation core wire again, wherein the first preset fluctuation suppression rate is less than the second preset fluctuation suppression rate.

4. The method for producing a cable insulated core wire based on heating power adjustment according to claim 3, characterized by, When it is determined that the production of the cable insulation core wire does not meet the preset standard based on the comparison result that the fluctuation suppression rate is less than the first preset fluctuation suppression rate, the processing strategy when the production of the cable insulation core wire does not meet the preset standard is determined according to the gray level range of the core wire section of the cable insulation core wire.

5. The method for producing a cable insulated core wire based on heating power adjustment according to claim 4, characterized by, The production of the cable insulation core wire is determined to be inconsistent with the preset standard based on the comparison result that the gray scale standard deviation of the cable insulation core wire is greater than or equal to the preset gray scale standard deviation, and the pulling speed of the core wire in the next batch is reduced according to the difference between the gray scale standard deviation and the preset gray scale standard deviation, wherein the gray scale standard deviation is the standard deviation of the gray scale values of all pixel points in the infrared thermal image of the cable insulation core wire along the length direction.

6. The method for producing a cable insulated core wire based on heating power adjustment according to claim 5, wherein Several speed adjustment modes are provided for the reduction of the pulling speed, and each speed adjustment mode has a different reduction amplitude of the pulling speed.

7. The method for producing a cable insulated core wire based on heating power adjustment according to claim 6, wherein The process of determining the processing strategy when the production of the cable insulation core wire is inconsistent with the preset standard based on the gray scale range of the core section of the cable insulation core wire includes: Comparing the gray scale range of the core section with a preset gray scale range; If the gray scale range is less than the preset gray scale range, increasing the heating power of the heating cavity according to the difference between the preset gray scale range and the gray scale range; If the gray scale range is greater than or equal to the preset gray scale range, stopping heating and issuing an alarm.

8. The method for producing a cable insulated core wire based on heating power adjustment according to claim 7, characterized by, The process of obtaining the gray scale range of the core section of the cable insulation core wire includes: Obtaining an infrared thermal image of the cross section of the cable insulation core wire; In the circumferential direction of the infrared thermal image, collecting the gray scale values of a plurality of uniformly distributed pixel points; Obtaining the maximum gray scale value and the minimum gray scale value among the plurality of gray scale values; The difference between the maximum gray scale value and the minimum gray scale value is recorded as the gray scale range.

9. The method for producing a cable insulated core wire based on heating power adjustment according to claim 8, characterized by, The increasing amplitude of the heating power of the heating cavity is positively correlated with the gray scale deviation value, wherein the gray scale deviation value is the difference between the preset gray scale range and the gray scale range.

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