Enameled wire production on-line monitoring system and control method thereof

Abstract

The invention discloses an enameled wire production on-line monitoring system and a control method thereof, and relates to the technical field of enameled wire production, and the control method comprises the following steps: in a production cycle, a laser diameter measuring instrument identifies the positions of bamboo joint lines on an enameled wire, the positions are marked as bamboo joint defect points, and the multiple bamboo joint defect points are comprehensively analyzed from two aspects of spacing and time interval; the time interval analysis value is obtained by quantizing all unit interval duration values from a time dimension through a chi-square test method, so that whether the time interval of the bamboo joint defect points accords with a uniform distribution hypothesis or not can be judged, and whether the time interval has periodicity and the periodicity can be deduced; the distribution condition of occurrence time intervals of the bamboo joint defect points is quantified, and the interval analysis value is obtained by performing quantification processing on the defect intervals of all units through a Manhattan distance formula from the spatial dimension, and reflects the distance relation between the adjacent bamboo joint defect points; and whether the distribution of the bamboo joint defect points in the length direction of the enameled wire has periodicity can be identified.

Description

Technical Field

[0001] The present invention relates to the technical field of enameled wire production, and in particular to an enameled wire production online monitoring system and a control method thereof. Background Art

[0002] During the production of enameled wire, slub pattern is a common defect that affects the quality and performance of the enameled wire, thereby reducing the reliability of electrical equipment. In the traditional enameled wire production process, the detection of defects such as slub pattern mainly relies on manual sampling, which is difficult to identify in real time during the production process.

[0003] In the prior art, there is a lack of effective monitoring and analysis means for the coordinated relationship between key parameters such as the drawing wheel speed and the constant speed wheel speed during the production process, and it is impossible to timely identify product defects caused by parameter imbalance, which seriously affects the production quality and production efficiency of the enameled wire. Therefore, the present application uses a laser diameter gauge to identify the location where bamboo patterns appear on the enameled wire, which is recorded as bamboo defect points, and comprehensively analyzes multiple bamboo defect points from two aspects: spacing and time interval. On the one hand, the time interval analysis value is obtained by quantifying the time length values of all unit intervals through the chi-square test method from the time dimension. It can not only determine whether the time interval of the bamboo defect points conforms to the uniform distribution hypothesis, but also infer whether its time interval is periodic and the degree of periodicity, and quantify the distribution of the time intervals of the bamboo defect points. The spacing analysis value is obtained by quantifying the spacing of all unit defects through the Manhattan distance formula from the spatial dimension, reflecting the distance relationship between adjacent bamboo defect points, which helps to identify whether the distribution of bamboo defect points in the length direction of the enameled wire is periodic. By analyzing the speed imbalance of the drawing wheel speed and the fixed-speed wheel speed at the same time, the speed imbalance phenomenon can be identified in a timely and accurate manner, solving the problem that the speed imbalance is difficult to detect in time. If the speed is unbalanced, it is analyzed whether the speed imbalance will cause bamboo defects in the drawing process. Therefore, through the correlation analysis of the speed imbalance and bamboo defects, it can be determined whether bamboo defects will be caused when the speed is unbalanced, solving the problem that it is difficult to determine the correlation between the speed imbalance and product defects. If so, the speed adjustment amount is obtained, solving the problem that bamboo defects appear in the drawing process due to speed imbalance and the adjustment amount is difficult to accurately determine. Summary of the Invention

[0004] The object of the present invention is to provide an online monitoring system for enameled wire production and a control method thereof, so as to solve at least one of the above-mentioned problems in the prior art.

[0005] First, the online monitoring method for enameled wire production includes: By measuring the diameter of the enameled wire, the bamboo defect points on the enameled wire can be identified and located; Through comprehensive analysis of positioning spacing and positioning time difference, it is determined whether the occurrence of bamboo node defects has periodicity; If there is one, extract the drawing wheel speed and the fixed speed wheel speed when the bamboo node defect point appears, and perform speed correlation analysis to determine the degree of correlation between the speeds of the drawing wheel and the fixed speed wheel; If the correlation is high, the speed point proportional imbalance analysis is performed using the constructed speed analysis curve and defect analysis curve to determine whether the speed is unbalanced. If unbalanced, the speed adjustment amount is determined based on the degree of speed deviation, and the speed of the drawing wheel is adjusted.

[0006] As a further solution of the present invention, the diameter of the enameled wire is compared with a preset wire diameter range, and the process is as follows: If the diameter of the enameled wire is not within the preset wire diameter range, it will be identified and located as a bamboo defect point.

[0007] As a further solution of the present invention, the monitoring time points of bamboo joint defects are counted to obtain a defect analysis sequence; In the defect analysis sequence, the positioning time difference between adjacent monitoring time points is used as input and input into the chi-square test method for output calculation, and the output is the time interval analysis value.

[0008] As a further solution of the present invention, the positioning distance between adjacent bamboo defect points on the enameled wire is input into the Manhattan distance formula for output calculation, and the output is a spacing analysis value.

[0009] As a further solution of the present invention, the sum of the time interval analysis value and the spacing analysis value is input, and the bamboo period value is output; If the bamboo period value is less than or equal to the bamboo period threshold, a periodic stable signal is generated.

[0010] As a further solution of the present invention, the drawing wheel speed and the constant speed wheel speed corresponding to the occurrence of bamboo node defects are obtained respectively as input, input into the Pearson correlation coefficient analysis method, and the absolute value is taken to output the correlation closeness value.

[0011] As a further solution of the present invention, if the correlation closeness value is close to 1, a high correlation signal is generated.

[0012] As a further solution of the present invention, at the monitoring time point when the bamboo defect point appears, the rotation speeds of the drawing wheel and the fixed speed wheel are respectively obtained, and the rotation speed deviation ratio between the drawing wheel and the fixed speed wheel is calculated to obtain the rotation speed deviation ratio; If the speed deviation ratio is greater than the speed deviation ratio threshold, a speed imbalance signal is generated.

[0013] As a further solution of the present invention, based on the speed imbalance signal, the speed deviation ratio is subtracted from the speed deviation ratio threshold to obtain the speed adjustment amount.

[0014] Secondly, the online monitoring system for enameled wire production includes the following modules: Defect recognition module: Identifies and locates bamboo defects on enameled wire by measuring the wire diameter; Periodicity analysis module: Through comprehensive analysis of positioning spacing and positioning time difference, it determines whether the occurrence of bamboo joint defects is periodic; Correlation analysis module: If there is a bamboo defect, the drawing wheel speed and the fixed speed wheel speed are extracted respectively, and the speed correlation analysis is performed to determine the degree of correlation between the speeds of the drawing wheel and the fixed speed wheel; Defect adjustment module: If the correlation is high, the speed point proportional imbalance analysis is performed through the constructed speed analysis curve and defect analysis curve to determine whether the speed is unbalanced. If unbalanced, the speed adjustment amount is determined according to the degree of speed deviation and the speed of the drawing wheel is adjusted.

[0015] Beneficial effects of the present invention: 1. During the production cycle, the present invention uses a laser diameter gauge to identify whether slub patterns appear in the enameled wire. If so, they are marked as slub defects. A comprehensive analysis of multiple slub defects is performed from two aspects: spacing and time intervals. On the one hand, the time interval analysis value is obtained by quantifying the duration of all unit intervals using the chi-square test method in the time dimension. This value can not only determine whether the time intervals of the slub defects conform to the uniform distribution assumption, but also infer whether the time intervals are periodic and the degree of periodicity, and quantify the distribution of the time intervals of the slub defects. On the other hand, the spacing analysis value is obtained by quantifying the spacing of all unit defects using the Manhattan distance formula in the spatial dimension. This value reflects the distance relationship between adjacent slub defects and helps to identify whether the distribution of slub defects in the length direction of the enameled wire is periodic. 2. The present invention analyzes the speed imbalance of the drawing wheel speed and the fixed-speed wheel speed at the same time based on high-correlation signals, and can timely and accurately identify the speed imbalance phenomenon, solving the problem that the speed imbalance is difficult to detect in time. If the speed is unbalanced, it analyzes whether the speed imbalance will cause bamboo defects in the drawing process. Therefore, through the correlation analysis of the speed imbalance and bamboo defects, it can be clear whether bamboo defects will be caused when the speed is unbalanced, solving the problem that it is difficult to determine the correlation between the speed imbalance and product defects. If it is caused, the speed adjustment amount is obtained, solving the problem that bamboo defects appear in the drawing process due to speed imbalance and the adjustment amount is difficult to accurately determine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a flow chart of the online monitoring method for enameled wire production of the present invention; Figure 2 It is a schematic diagram of the online monitoring system for enameled wire production. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0019] Example 1 Figure 1 This is a flow chart of the online monitoring method for enameled wire production provided in Example 1 of the present invention, as shown in FIG. Figure 1 As shown, the online monitoring method for enameled wire production provided by the embodiment of the present invention specifically includes the following steps: Step 1: During the production cycle, use a laser diameter gauge to identify whether the enameled wire has slub marks. If so, mark the location where the slub marks appear as a slub defect point. In some embodiments, the production cycle is divided into several monitoring time points; The diameter of the enameled wire corresponding to the monitoring time point is obtained by a laser diameter gauge. The process is as follows: The geometric data after being blocked by the enameled wire harness is measured by laser diameter measurement, wherein the geometric data includes the distance L between the laser emitter and the receiver, the angle at which the laser beam is blocked by the harness, , the geometric data is passed through the formula: , calculate the diameter of the enameled wire ; Compare the diameter of the enameled wire with the preset wire diameter range. The process is as follows: If the diameter of the enameled wire is not within the preset wire diameter range, it means that bamboo knots appear during the drawing process of the enameled wire, and the location where the bamboo knots appear is marked as a bamboo knot defect point; If the diameter of the enameled wire is within the preset diameter range, it means that the diameter of the enameled wire is within the normal range; It should be noted that the preset wire diameter range is set by those skilled in the art based on experience; Step 2: Comprehensively analyze multiple bamboo defect points from the perspectives of spacing and time interval to obtain a bamboo period value, which is then compared with a bamboo period threshold. If the bamboo period value is less than or equal to the bamboo period threshold, a period stability signal is generated. In some embodiments, the plurality of bamboo defect points are sorted according to the time sequence of the corresponding monitoring time points to obtain a defect analysis sequence; It should be noted that there are n bamboo defect points in the defect analysis sequence; In the defect analysis sequence, the time interval between adjacent monitoring time points is obtained and the ratio of the time interval to the production cycle length is calculated as the unit interval length. All unit interval durations were processed using the chi-square test method to obtain the interval analysis value; Specifically, for example, the defect analysis sequence contains 10, 12, 15, 13, 14, 16, 18, 17, 15, 16, 14, and 17; Extract the maximum unit interval length 18 and the minimum unit interval length 12, make the difference, and divide it by the preset number of divided windows 3 to obtain the window interval value 2, that is, the first preset window is , the second preset window is , the third preset window is ; Based on the three preset windows, the observation frequencies corresponding to the first preset window, the second preset window, and the third preset window are counted, which are 2, 5, and 5 respectively; If the data in the defect analysis sequence is evenly distributed, the expected frequency of each preset window is obtained by dividing the total number of data in the defect analysis sequence by the number of preset partition windows, that is, the expected frequency is 4; By chi-square test formula: , calculate the time interval analysis value is 1.5, where It is expressed as the observed frequency and E is expressed as the expected frequency; It should be noted that the essence of the chi-square test method is to compare the difference between the observed frequency and the expected frequency to determine whether the time interval of the bamboo defect points conforms to the uniform distribution hypothesis. Now, multiple bamboo defect points in the defect analysis sequence are placed into several preset windows of equal interval length according to the corresponding monitoring time points, and the observed frequency and the expected frequency are obtained, so as to determine whether the distribution of bamboo defect points in different time interval windows is uniform, and quantify the time interval between the occurrence of adjacent bamboo defect points, which helps to quantify the change in the frequency of bamboo defect points at different time intervals, and then infer whether the time interval of bamboo defect points is periodic. If so, the periodicity of the time interval is further quantified. In the defect analysis sequence, the spacing between bamboo defect points corresponding to adjacent monitoring time points is obtained, and the ratio is calculated with the length of the enameled wire to obtain the unit defect spacing; Substitute all unit defect intervals into the Manhattan distance formula according to the time series to obtain the interval analysis value; For example, in the defect analysis sequence, if the unit defect spacing between the first-ranked bamboo joint defect point and the second-ranked bamboo joint defect point, the unit defect spacing between the second-ranked bamboo joint defect point and the third-ranked bamboo joint defect point, and the unit defect spacing between the n-1th bamboo joint defect point and the nth bamboo joint defect point are obtained simultaneously; By the Manhattan distance formula: , calculate the spacing analysis value , where m represents the total number of unit defect spacings, Expressed as the mth unit defect spacing; It should be noted that the Manhattan distance formula is essentially the distance between points in a rectangular coordinate system, which is the Manhattan distance. The distance interval between adjacent bamboo defect points in the defect analysis sequence is now substituted into the Manhattan distance formula. Its purpose is to quantify the distance relationship between adjacent bamboo defect points, which helps to identify whether there is periodicity in the distribution of bamboo defect points in the length direction of the enameled wire. If so, on the one hand, the location of bamboo defect points that will appear in the future can be predicted based on known data. On the other hand, the factors that cause the continuous appearance of bamboo defect points in the enameled wire during the production process can be targeted and checked, thereby improving the efficiency of production and maintenance. It should be noted that the factors that lead to the continuous occurrence of bamboo defects in the enameled wire include but are not limited to the inconsistency between the speed of the drawing wheel and the speed-fixing wheel; The time interval analysis value and the spacing analysis value are summed to obtain the bamboo period value; It can be understood that the meaning of the slub period value is to reflect the periodic characteristics of the slub defect points in both time and space dimensions, which helps to identify whether there is periodicity in the distribution of slub defect points along the length direction of the enameled wire and whether there is periodicity in the distribution of slub defect points along the production time dimension. The bamboo period value is compared with the bamboo period threshold value. The process is as follows: If the bamboo period value is greater than the bamboo period threshold, it means that the bamboo defect points are unevenly distributed in time and space, generating a non-periodic stable signal; If the bamboo period value is less than or equal to the bamboo period threshold, it means that the bamboo defect points are evenly distributed in time and space, generating a periodic stable signal; The specific implementation plan of the embodiment of the present invention is: during the production cycle, a laser diameter gauge is used to identify whether bamboo joints appear in the enameled wire. If so, it is marked as a bamboo joint defect point, and a comprehensive analysis is performed on multiple bamboo joint defect points from two aspects: spacing and time interval. On the one hand, the time interval analysis value is obtained by quantifying the time interval values of all unit intervals through the chi-square test method from the time dimension. It can not only determine whether the time interval of the bamboo joint defect points conforms to the uniform distribution hypothesis, but also infer whether the time interval is periodic and the degree of periodicity, and quantify the distribution of the time intervals of the bamboo joint defect points. The spacing analysis value is obtained by quantifying the spacing of all unit defects through the Manhattan distance formula from the spatial dimension, reflecting the distance relationship between adjacent bamboo joint defect points, which helps to identify whether there is periodicity in the distribution of bamboo joint defect points in the length direction of the enameled wire.

[0020] Example 2 Step 3: Based on the periodic stable signal, extract the monitoring nodes corresponding to multiple bamboo defect points, obtain the drawing wheel speed and the constant speed wheel speed corresponding to the monitoring nodes, obtain the relevant tightness value, and compare it with the relevant tightness threshold to obtain the speed evaluation result; The rotation speed evaluation result includes a high correlation signal or a low correlation signal; In some embodiments, a monitoring node corresponding to a bamboo defect point is arbitrarily selected, and the speed of the drawing wheel and the speed of the constant speed wheel are obtained by a laser velocimeter; The process of obtaining the drawing wheel speed by the laser velocimeter is as follows: The laser velocimeter can emit a laser beam to the surface of the drawing wheel. After the laser is reflected by the drawing wheel surface, the frequency of the reflected light changes due to the rotation of the drawing wheel. By measuring this frequency change, the linear speed of the drawing wheel can be calculated, and then the rotation speed can be converted according to parameters such as the radius of the drawing wheel. It should be noted that the process of obtaining the speed of the constant speed wheel is the same as that of the drawing wheel; Sort the drawing wheel speeds of all bamboo defect points corresponding to the production monitoring nodes in time series and obtain Analyze data; Similarly, the speed of the fixed-speed wheel corresponding to the production monitoring nodes of all bamboo defect points is sorted according to the time series, and the Analyze data; It should be noted that The total number of all drawing wheel speeds in the analysis data and The total number of speeds of all fixed-speed wheels in the analysis data is the same, which is Q; The correlation coefficients were obtained by performing correlation analysis on all extracted drawing wheel speeds and fixed speed wheel speeds. The process is as follows: A1, Analyze the data of all the drawing wheel speeds to normalize the data, and All the speeds of the fixed-speed wheels in the analysis data are normalized; A2, obtain The average value of all drawing wheel speeds in the analysis data , and The average value of all constant speed wheel speeds in the analysis data ; A3, Average value of analyzed data and Average value of analyzed data Substitute into the Pearson correlation coefficient calculation formula to calculate the correlation coefficient , the Pearson correlation coefficient calculation formula is as follows:

[0021] in, for Analyze the drawing wheel speed when the bamboo defect point appears at the jth monitoring node in the data, for Analyze the speed of the fixed-speed wheel when the bamboo defect point appears at the jth monitoring node in the data; The correlation coefficient Take the absolute value to get the correlation closeness value; If the correlation closeness value r is close to 1, it means that the speed of the drawing wheel and the speed of the fixed speed wheel are closely related, and a high correlation signal is generated; It should be noted that the correlation value r is close to 1, which means that the value range of r is ; If the correlation closeness value r is close to 0, it means that the speed of the drawing wheel and the speed of the fixed speed wheel are less close, and a low correlation signal is generated; It should be noted that the correlation value r is close to 0, which means that the value range of r is ; Step 4: Based on the high-correlation signal, construct a speed analysis curve and a defect analysis curve to perform speed imbalance analysis and determine whether the speed imbalance causes bamboo defects during the wire drawing process. If so, obtain the speed adjustment amount to solve the problem of bamboo defects during the wire drawing process caused by speed imbalance. In some embodiments, Analyze data and Analyze the data using drawing software such as Origin and Excel to construct a velocity analysis curve with time as the X coordinate and velocity as the Y coordinate; All data in the defect analysis sequence are used through drawing software such as Origin and Excel to construct a defect analysis curve with time as the X coordinate and the position of the bamboo defect point as the Y coordinate; Based on the time of the monitoring node corresponding to the bamboo defect point, the drawing wheel speed and the constant speed wheel speed on the imbalance analysis curve are extracted; Substitute the extracted drawing wheel speed and fixed speed wheel speed into the calculation formula of the speed deviation ratio to calculate the speed deviation ratio , the calculation formula of the speed deviation ratio is as follows:

[0022] in, Represented as defect analysis curve The speed of the fixed-speed wheel when the bamboo defect point appears at the jth monitoring node in the analysis data is expressed as Analyze the drawing wheel speed when the bamboo defect point appears at the jth monitoring node in the data; If the speed deviation ratio If the value is greater than the speed deviation ratio threshold, it means that the speed of the drawing wheel and the speed of the fixed speed wheel are not synchronized well, and a speed imbalance signal is generated. If the speed deviation ratio If the speed deviation ratio is less than or equal to the speed deviation ratio threshold, it means that the speed of the drawing wheel and the speed of the fixed speed wheel are highly synchronized, and a speed synchronization signal is generated; Based on the speed imbalance signal, the speed of the drawing wheel is adjusted to obtain the speed deviation ratio , and subtract it from the speed deviation ratio threshold to obtain the speed adjustment amount; The current drawing wheel speed and the speed adjustment amount are summed to calculate and obtain the drawing wheel speed that needs to be adjusted; The specific implementation plan of the embodiment of the present invention is: based on the high-correlation signal, the speed imbalance analysis is performed on the drawing wheel speed and the fixed-speed wheel speed at the same time, which can timely and accurately identify the speed imbalance phenomenon, and solve the problem that the speed imbalance is difficult to detect in time. If the speed is unbalanced, it is analyzed whether the speed imbalance will cause bamboo defects in the drawing process. Therefore, through the correlation analysis of the speed imbalance and bamboo defects, it can be determined whether bamboo defects will be caused when the speed is unbalanced, and the problem of difficulty in determining the correlation between the speed imbalance and product defects is solved. If it is caused, the speed adjustment amount is obtained, and the problem that bamboo defects appear in the drawing process due to speed imbalance and the adjustment amount is difficult to accurately determine is solved.

[0023] Example 3 like Figure 2 As shown, the enameled wire production online monitoring system provided by the embodiment of the present invention specifically includes: Defect identification module: During the production cycle, a laser diameter gauge is used to identify whether slub marks appear on the enameled wire. If so, the location where the slub marks appear is marked as a slub defect point. In some embodiments, the production cycle is divided into several monitoring time points; The diameter of the enameled wire corresponding to the monitoring time point is obtained by a laser diameter gauge. The process is as follows: The geometric data after being blocked by the enameled wire harness is measured by laser diameter measurement, wherein the geometric data includes the distance L between the laser emitter and the receiver, the angle at which the laser beam is blocked by the harness, , the geometric data is passed through the formula: , calculate the diameter of the enameled wire ; Compare the diameter of the enameled wire with the preset wire diameter range. The process is as follows: If the diameter of the enameled wire is not within the preset wire diameter range, it means that bamboo knots appear during the drawing process of the enameled wire, and the location where the bamboo knots appear is marked as a bamboo knot defect point; If the diameter of the enameled wire is within the preset diameter range, it means that the diameter of the enameled wire is within the normal range; Period analysis module: This module comprehensively analyzes multiple bamboo defect points from the perspectives of spacing and time interval to obtain a bamboo period value, which is then compared with the bamboo period threshold. If the bamboo period value is less than or equal to the bamboo period threshold, a period stability signal is generated. In some embodiments, the plurality of bamboo defect points are sorted according to the time sequence of the corresponding monitoring time points to obtain a defect analysis sequence; In the defect analysis sequence, the time interval between adjacent monitoring time points is obtained and the ratio of the time interval to the production cycle length is calculated as the unit interval length. All unit interval durations were processed using the chi-square test method to obtain the interval analysis value; Specifically, for example, the defect analysis sequence contains 10, 12, 15, 13, 14, 16, 18, 17, 15, 16, 14, and 17; Extract the maximum unit interval length 18 and the minimum unit interval length 12, make the difference, and divide it by the preset number of divided windows 3 to obtain the window interval value 2, that is, the first preset window is , the second preset window is , the third preset window is ; Based on the three preset windows, the observation frequencies corresponding to the first preset window, the second preset window, and the third preset window are counted, which are 2, 5, and 5 respectively; If the data in the defect analysis sequence is evenly distributed, the expected frequency of each preset window is obtained by dividing the total number of data in the defect analysis sequence by the number of preset partition windows, that is, the expected frequency is 4; By chi-square test formula: , calculate the time interval analysis value is 1.5, where It is expressed as the observed frequency and E is expressed as the expected frequency; In the defect analysis sequence, the spacing between bamboo defect points corresponding to adjacent monitoring time points is obtained, and the ratio is calculated with the length of the enameled wire to obtain the unit defect spacing; Substitute all unit defect intervals into the Manhattan distance formula according to the time series to obtain the interval analysis value; For example, in the defect analysis sequence, if the unit defect spacing between the first-ranked bamboo joint defect point and the second-ranked bamboo joint defect point, the unit defect spacing between the second-ranked bamboo joint defect point and the third-ranked bamboo joint defect point, and the unit defect spacing between the n-1th bamboo joint defect point and the nth bamboo joint defect point are obtained simultaneously; By the Manhattan distance formula: , calculate the spacing analysis value , where m represents the total number of unit defect spacings, Expressed as the mth unit defect spacing; The time interval analysis value and the spacing analysis value are summed to obtain the bamboo period value; The bamboo period value is compared with the bamboo period threshold value. The process is as follows: If the bamboo period value is greater than the bamboo period threshold, it means that the bamboo defect points are unevenly distributed in time and space, generating a non-periodic stable signal; If the bamboo period value is less than or equal to the bamboo period threshold, it means that the bamboo defect points are evenly distributed in time and space, generating a periodic stable signal; Correlation analysis module: Based on the periodic stable signal, it extracts the monitoring nodes corresponding to multiple bamboo joint defects, obtains the drawing wheel speed and the fixed speed wheel speed corresponding to the monitoring nodes, obtains the correlation closeness value, and compares it with the correlation closeness threshold to obtain a high correlation signal or a low correlation signal; In some embodiments, a monitoring node corresponding to a bamboo defect point is arbitrarily selected, and the speed of the drawing wheel and the speed of the constant speed wheel are obtained by a laser velocimeter; The process of obtaining the drawing wheel speed by the laser velocimeter is as follows: The laser velocimeter can emit a laser beam to the surface of the drawing wheel. After the laser is reflected by the drawing wheel surface, the frequency of the reflected light changes due to the rotation of the drawing wheel. By measuring this frequency change, the linear speed of the drawing wheel can be calculated, and then the rotation speed can be converted according to parameters such as the radius of the drawing wheel. Sort the drawing wheel speeds of all bamboo defect points corresponding to the production monitoring nodes in time series and obtain Analyze data; Similarly, the speed of the fixed-speed wheel corresponding to the production monitoring nodes of all bamboo defect points is sorted according to the time series, and the Analyze data; The correlation coefficients were obtained by performing correlation analysis on all extracted drawing wheel speeds and fixed speed wheel speeds. The process is as follows: A1, Analyze the data of all the drawing wheel speeds to normalize the data, and All the speeds of the fixed-speed wheels in the analysis data are normalized; A2, obtain The average value of all drawing wheel speeds in the analysis data , and The average value of all constant speed wheel speeds in the analysis data ; A3, Average value of analyzed data and Average value of analyzed data Substitute into the Pearson correlation coefficient calculation formula to calculate the correlation coefficient , the Pearson correlation coefficient calculation formula is as follows:

[0024] in, for Analyze the drawing wheel speed when the bamboo defect point appears at the jth monitoring node in the data, for Analyze the speed of the fixed-speed wheel when the bamboo defect point appears at the jth monitoring node in the data; The correlation coefficient Take the absolute value to get the correlation closeness value; If the correlation closeness value r is close to 1, it means that the speed of the drawing wheel and the speed of the fixed speed wheel are closely related, and a high correlation signal is generated; If the correlation closeness value r is close to 0, it means that the speed of the drawing wheel and the speed of the fixed speed wheel are less close, and a low correlation signal is generated; Defect Adjustment Module: Based on highly correlated signals, it constructs speed analysis curves and defect analysis curves to perform speed imbalance analysis and determine whether speed imbalance causes bamboo defects during the wire drawing process. If so, it obtains the speed adjustment amount to resolve the bamboo defect problem caused by speed imbalance during the wire drawing process. In some embodiments, Analyze data and Analyze the data using drawing software such as Origin and Excel to construct a velocity analysis curve with time as the X coordinate and velocity as the Y coordinate; All data in the defect analysis sequence are used through drawing software such as Origin and Excel to construct a defect analysis curve with time as the X coordinate and the position of the bamboo defect point as the Y coordinate; Based on the time of the monitoring node corresponding to the bamboo defect point, the drawing wheel speed and the constant speed wheel speed on the imbalance analysis curve are extracted; Substitute the extracted drawing wheel speed and fixed speed wheel speed into the calculation formula of the speed deviation ratio to calculate the speed deviation ratio , the calculation formula of the speed deviation ratio is as follows:

[0025] in, Represented as defect analysis curve Analyze the speed of the fixed-speed wheel when the bamboo defect point appears at the jth monitoring node in the data. Expressed as Analyze the drawing wheel speed when the bamboo defect point appears at the jth monitoring node in the data; If the speed deviation ratio If the value is greater than the speed deviation ratio threshold, it means that the speed of the drawing wheel and the speed of the fixed speed wheel are not synchronized well, and a speed imbalance signal is generated. If the speed deviation ratio If the speed deviation ratio is less than or equal to the speed deviation ratio threshold, it means that the speed of the drawing wheel and the speed of the fixed speed wheel are highly synchronized, and a speed synchronization signal is generated; Based on the speed imbalance signal, the speed of the drawing wheel is adjusted to obtain the speed deviation ratio , and subtract it from the speed deviation ratio threshold to obtain the speed adjustment amount; The current drawing wheel speed and the speed adjustment amount are summed and calculated to obtain the drawing wheel speed that needs to be adjusted.

[0026] The above formulas are all dimensionless and numerical calculations. The formulas are obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formulas are set by technicians in this field according to actual conditions.

[0027] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. The online monitoring method for enameled wire production is characterized in that: The following steps are involved: By measuring the diameter of the enameled wire, the bamboo defect points on the enameled wire can be identified and located; Through comprehensive analysis of positioning spacing and positioning time difference, it is determined whether the occurrence of bamboo node defects has periodicity; If there is one, extract the drawing wheel speed and the fixed speed wheel speed when the bamboo node defect point appears, and perform speed correlation analysis to determine the degree of correlation between the speeds of the drawing wheel and the fixed speed wheel; If the correlation is high, the speed point proportional imbalance analysis is performed using the constructed speed analysis curve and defect analysis curve to determine whether the speed is unbalanced. If unbalanced, the speed adjustment amount is determined based on the degree of speed deviation, and the speed of the drawing wheel is adjusted.

2. The method for online monitoring of enameled wire production according to claim 1, characterized in that: The identification process for locating bamboo defect points on enameled wire is as follows: If the diameter of the enameled wire is not within the preset wire diameter range, it will be identified and located as a bamboo defect point.

3. The online monitoring method for enameled wire production according to claim 1, characterized in that: The judgment process of whether the occurrence of bamboo node defects is periodic is as follows: The sum of the time interval analysis value and the spacing analysis value is input, and the bamboo period value is output; if the bamboo period value is less than or equal to the bamboo period threshold, a periodic stable signal is generated.

4. The method for online monitoring of enameled wire production according to claim 3, characterized in that: The process of obtaining the time interval analysis value is as follows: The monitoring time points of bamboo joint defects are counted based on the time interval analysis value to obtain the defect analysis sequence; In the defect analysis sequence, the positioning time difference between adjacent monitoring time points is input into the chi-square test method for output calculation, and the output is the time interval analysis value.

5. The method for online monitoring of enameled wire production according to claim 1, characterized in that: The process of obtaining the spacing analysis value is as follows: The positioning distance between adjacent bamboo defect points on the enameled wire is input into the Manhattan distance formula for output calculation, and the output is the spacing analysis value.

6. The method for online monitoring of enameled wire production according to claim 1, characterized in that: The corresponding drawing wheel speed and constant speed wheel speed when the bamboo node defect point appears are obtained respectively, input into the Pearson correlation coefficient analysis method, and the absolute value is taken to output the correlation closeness value.

7. The method for online monitoring of enameled wire production according to claim 6, characterized in that: If the correlation closeness value is close to 1, a high correlation signal is generated.

8. The method for online monitoring of enameled wire production according to claim 1, characterized in that: The process of judging whether there is imbalance is as follows: At the monitoring time point when the bamboo defect point appears, the rotation speeds of the drawing wheel and the fixed speed wheel are respectively obtained, and the rotation speed deviation ratio between the drawing wheel and the fixed speed wheel is obtained by calculating the rotation speed deviation ratio; If the speed deviation ratio is greater than the speed deviation ratio threshold, a speed imbalance signal is generated.

9. The method for online monitoring of enameled wire production according to claim 8, characterized in that: The process of determining the speed adjustment amount is: Based on the speed imbalance signal, the speed deviation ratio is subtracted from the speed deviation ratio threshold to obtain the speed adjustment amount.

10. An online monitoring system for enameled wire production, the system being configured to execute the method according to any one of claims 1 to 9, the system comprising: Defect recognition module: Identifies and locates bamboo defects on enameled wire by measuring the wire diameter; Periodicity analysis module: Through comprehensive analysis of positioning spacing and positioning time difference, it determines whether the occurrence of bamboo joint defects is periodic; Correlation analysis module: If there is a bamboo defect, the drawing wheel speed and the fixed speed wheel speed are extracted respectively, and the speed correlation analysis is performed to determine the degree of correlation between the speeds of the drawing wheel and the fixed speed wheel; Defect adjustment module: If the correlation is high, the speed point proportional imbalance analysis is performed through the constructed speed analysis curve and defect analysis curve to determine whether the speed is unbalanced. If unbalanced, the speed adjustment amount is determined according to the degree of speed deviation and the speed of the drawing wheel is adjusted.

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