CN111289811A - Method for detecting quality of conductor pole based on continuous information - Google Patents
Method for detecting quality of conductor pole based on continuous information Download PDFInfo
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- CN111289811A CN111289811A CN201811490863.6A CN201811490863A CN111289811A CN 111289811 A CN111289811 A CN 111289811A CN 201811490863 A CN201811490863 A CN 201811490863A CN 111289811 A CN111289811 A CN 111289811A
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Abstract
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information, and belongs to the technical field of online detection. The method comprises the following steps: during detection, the detection device and the conducting wire rod can move relatively, and the quality of the conducting wire rod is judged by continuously acquiring information and calculating information parameters; the information includes, but is not limited to, voltage, current, position, the information is continuous information; the information parameter is selected from at least one of resistance, resistivity, conductivity and voltage; and comparing the obtained information parameter with the standard information parameter, judging that the area corresponding to the obtained information parameter has defects when the value of the obtained information parameter-standard information parameter/standard information parameter is greater than or equal to a defect judgment threshold value, and judging that the quality of the area corresponding to the obtained information parameter is qualified when the value of the obtained information parameter-standard information parameter/standard information parameter is less than the defect judgment threshold value.
Description
Technical Field
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information, belonging to the technical field of online detection, in particular to the technical field of online detection of conducting materials.
Background
With the continuous expansion of power demand, the demand for conductive wire poles is continuously expanding, and particularly, the demand for high-end wire poles is greatly increasing. However, due to the lack of an effective online detection and monitoring system, the quality of the produced conductor pole is not guaranteed, and thus, China lacks competitiveness in the high-end field of conductor pole production. The on-line quality detection system for the production of the conductor pole is established, the product quality is improved by accurately feeding back and controlling the production process, and the problem which is very concerned by the conductor pole production unit in China is always. At present, the most used online detection methods for the defects of the conducting wire rod comprise an eddy current detection method and a surface quality detection method based on images, but both have certain application limitations. The eddy current detection method has high detection sensitivity on defects such as cracks, scratches, inclusions, pits and the like on the surface of a product, but the defects can be fully exposed only by heating for enough time, so that the response speed is low, and the eddy current detection method is not suitable for being applied to a high-speed production line. The image-based surface quality detection method can accurately detect the surface defects of the conducting rod, but cannot detect the conducting rod with internal defects. In addition, high-temperature treatment means such as annealing and the like are often involved in the production process, the detection facilities cannot be arranged in the whole production line, and a 'blind spot' exists in detection and control. Patent CN201310530795.2 discloses a resistance testing device capable of measuring the resistance change of a sample in a temperature-changing environment, but the patent does not relate to information collection and analysis, and the measured area is fixed.
The detection device and the conducting wire rod can move relatively, the quality information of the conducting wire rod can be continuously collected, and system calculation and analysis are carried out based on the collected continuous information, so that defect judgment and quality detection are realized. The invention can detect the moving or static conductive wire rod, can realize continuous detection and discrete detection, and has all functions of the existing discrete detection technology.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a technical scheme for detecting the quality of a conducting wire rod based on continuous information.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; during detection, the detection device and the conducting wire rod can move relatively, and the quality of the conducting wire rod is judged by continuously acquiring information and calculating information parameters; the information includes but is not limited to voltage, current and position, the information is continuous information, and the continuous information is information for continuously acquiring different positions of the conductive wire rod; the information parameter is selected from at least one of resistance, resistivity, conductivity and voltage, and is obtained by calculation according to the collected voltage or current and the size information of the measured regional conducting pole.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; when the information parameters are obtained through calculation according to the collected voltage or current and the size information of the measured regional conducting pole, the calculation adopts at least one of the following formulas:
resistance (Ω) is voltage (V) ÷ current (a);
resistivity (Ω · m) is resistance (Ω) × cross-sectional area (m)2) Length (m);
conductivity (S/m) ÷ 1 ÷ resistivity (Ω · m);
electrical conductivity (% IACS) — electrical conductivity (MS/m) ÷ 0.58.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the relative movement of the detection device and the guide pole comprises the following three conditions: the detection device is static, the conducting wire pole moves, the opposite direction of the moving direction of the conducting wire pole is defined as the detection direction, and the detection device is mainly used for detecting the conducting wire pole in the process production; the detection device moves, the conducting wire pole is static, the movement direction of the detection device is defined as the detection direction, and the detection device is mainly used for detecting the conducting wire pole which is difficult to move; the detection device and the conducting wire rod move at different speeds simultaneously, the opposite direction of the conducting wire rod relative to the movement direction of the detection device is defined as a detection direction, and the detection device is mainly used for assisting in adjusting information acquisition frequency and detecting a specific area; the relative movement is preferably a continuous relative movement.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the detection device is contacted with the conducting wire rod through contact ends, wherein 2 contact ends for acquiring information are arranged; the contact area between any one contact end and the conducting pole is less than or equal to 100mm2Preferably 25mm or less2More preferably 1mm or less2More preferably 0.1mm or less2The selection of the parameters is related to the detection precision, and for high-end detection, the preferable scheme is preferably selected while physical performance is ensured, of course, in order to further improve the reliability of the information, two contact ends for information acquisition and the wire guide pole are used for further improving the reliability of the informationThe contact areas are equal.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the conducting wire rod area between the 2 information acquisition contact ends is a detection area, the 1 st information acquisition contact end in the detection direction is defined as a positioning contact end, the state of the acquired 1 st information is defined as an initial state, and the conducting wire rod position in contact with the positioning contact end is an information acquisition initial point (coordinate origin) in the initial state; the origin of coordinates can also be manually set and changed; after the origin of coordinates is set, the positions of other points on the wire pole are represented by their distances from the origin of coordinates.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the detection device automatically acquires information in the process that the conducting wire rod enters and exits the detection area, and automatically draws an information parameter-distance curve; the abscissa of the information parameter-distance curve is the distance between the contact position of the wire guide pole and the positioning contact end and the information acquisition starting point; the distance may be obtained by direct measurement, or by calculation based on time and velocity parameters.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the information parameter-distance curve reflects the quality information of the wire guide pole, and the abnormal and normal return of the information parameter-distance curve reflects the entering and leaving of the defect in the detection area. Fig. 1 is a schematic diagram of an information parameter-distance curve corresponding to a defect and a location of a conductive wire rod, a starting point (O point) of the information parameter-distance curve is obtained according to the acquired 1 st information, a distance between a corresponding location of the O point on the conductive wire rod and the information acquisition starting point is 0, and an abscissa thereof is 0; the state A is a state that 1 defect is about to enter a detection area, when the conducting wire pole is changed from an initial state to the state A, no defect exists in the detection area, an OA section correspondingly appears in an information parameter-distance curve, the information parameter is a normal parameter, the distance between the corresponding position of a point A on the conducting wire pole and an information acquisition initial point is 50mm, and the abscissa of the point is 50 mm; the state B is a state that 1 defect just completely enters a detection area, when the conducting wire pole is changed from the state A to the state B, the defect goes through the processes of starting to enter the detection area and completely entering the detection area, an AB section correspondingly appears on an information parameter-distance curve, the information parameter is an abnormal parameter, the distance between the corresponding position of a point B on the conducting wire pole and an information acquisition starting point is 60mm, and the abscissa of the point is 60 mm; the C state is a state that the defect is about to leave the detection area, when the conducting wire pole is changed from the B state to the C state, the BC section of the information parameter-distance curve correspondingly appears, the distance between the corresponding position of the point C on the conducting wire pole and the information acquisition starting point is 90mm, and the abscissa of the point is 90 mm; the state D is a state of a detection area immediately after the defect leaves, when the conducting wire pole is changed from the state C to the state D, the information parameter returns to normal, the distance between the corresponding position of the point D on the conducting wire pole and the information acquisition starting point is 100mm, and the abscissa of the point is 100 mm.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; in a few cases, when the front end of the measured conducting wire rod has a defect, the information parameter of the initial point of the information parameter-distance curve is abnormal, or when the tail end of the measured conducting wire rod has a defect, the information parameter of the final point of the information parameter-distance curve is abnormal.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the acquired information can also comprise time and temperature information, and when the acquired information comprises time information, a continuous information parameter-position-time curve can be obtained according to the acquired information parameters, the position information and the time information.
Those skilled in the art can obtain the information and perform mathematical processing, theoretical calculation and physical meaning transformation according to the present invention, and the essence of the invention also belongs to the scope of the present invention.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; and comparing the obtained information parameter with the standard information parameter, judging that the area corresponding to the obtained information parameter has defects when the value of the obtained information parameter-standard information parameter/standard information parameter is greater than or equal to a defect judgment threshold value, and judging that the quality of the area corresponding to the obtained information parameter is qualified when the value of the obtained information parameter-standard information parameter/standard information parameter is less than the defect judgment threshold value.
The invention isA method for detecting the quality of a conductive wire rod based on continuous information; w for the defect judgment thresholdrDenotes that when the resulting information parameter is voltage and the unit used is V, the W isrThe value of (a) is greater than or equal to 0.0001, preferably 0.0001 to 0.1, more preferably 0.0001 to 0.01, and even more preferably 0.0001 to 0.001; when the information parameter is other information parameter, WrAnd carrying out corresponding conversion on the value of (A).
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; when the obtained information parameter-standard information parameter/standard information parameter is more than or equal to WrThen, it is judged that the measured region includes at least 1 kind or 1 kind of defects, and W is calculatedyW is as describedy＝(Ym-Ys)÷YsSaid Y issIs a standard information parameter, said YmIs the maximum or minimum value of the obtained information parameter, WyIs a defect determination factor.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; when the information parameter is voltage information and/or resistance and/or resistivity, Wy> 0, defect species include, but are not limited to, diameter reduction, scratching, indentation, denting, cracking, corrosion, Wy< 0, defect species including but not limited to bulge, diameter enlargement;
the invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; when the information parameter is conductivity and/or electric conductivity, Wy< 0, defect species include, but are not limited to, diameter reduction, scratch, indentation, dent, crack, corrosion, Wy> 0, defect species include, but are not limited to, bulge, larger diameter.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the position and the size of the defect on the conductive wire rod can be determined according to the information parameter-distance curve, the actual position and the defect length of the defect on the conductive wire rod are determined by the abscissa of the starting point and the ending point of the regression of the information parameter, and the significance degree of the defect is determined by the difference value between the maximum value (or the minimum value) of the information parameter and the standard information parameter; FIG. 2 is a diagram of an information parameter-distance curveThe obtained information parameter is represented by Y, and the standard information parameter is represented by YsIs represented by Ys±(Wr×Ys) For the normal information parameter range, the error range mainly takes the measurement error of the system into consideration. As shown in FIG. 2, the information parameter Y of the AB segment and BC segment satisfies | Y-Ys|＜Wr×YsReflecting that the corresponding conductor pole section is not defective, and the information parameter Y of the C point meets the absolute value of Y-Ys|＝Wr×Ys，Y＝YCThe obtained information parameter is in a critical value; the information parameter of the CD segment exceeds the normal range, | Y-Ys|≥Wr×YsGradually entering the detection area corresponding to the defect; the information parameter of DF segment is relatively constant, the corresponding defect is completely in the detection area, YmObtaining the maximum value of the information parameter; the information parameters of FG section start to regress, corresponding defects gradually leave the detection area, the position of the point F on the conductive wire rod is the starting point of the defect, and the information parameter value Y of the point G meets the condition of | Y-Ys|＝Wr×Ys，Y＝YGThe obtained information parameter is at a critical value, and the corresponding position of the point G on the conducting wire rod is a defect termination point; the information parameters of the GH section and the HI section satisfy Y-Ys|＜Wr×YsAnd the information parameters are in the normal information parameter range, and reflect that the corresponding conductor pole region is not defective.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; defects that cause a change in the resistance of a material, including but not limited to a change in the resistivity of the material, a change in cross-sectional area; when the defect is of the type having a smaller diameter, the smaller diameter results in an increase in resistance, as shown in FIG. 3, YmIs the maximum value of the continuous resistance obtained, Ym＞Ys，WyIs greater than 0; when the defect is of the type having a larger diameter, the larger diameter results in a smaller resistance, as shown in FIG. 4, YmIs the minimum value of the continuous resistance obtained, Ym＜Ys，Wy＜0；YmAnd YsThe difference in (b) reflects the severity of the defect.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the number of defects can be judged by analyzing the change condition of the information parameter-distance curve; generally, the obtained information parameter-distance curve is abnormal and returns to normal for 1 time, and the corresponding area of the conducting wire rod can be judged to have at least 1 or 1 defect; in a few cases, the information parameter-distance curve is abnormal repeatedly and returns to normal or the change rate is increased or reduced suddenly, and at least 2 or 2 defects can be determined to exist in the corresponding area of the conducting wire rod; in rare cases, the information parameter-distance curve is abnormal and returns to normal repeatedly, and finally the normal parameter range can not be returned, and the fact that a large number of defects exist in the corresponding area of the conducting wire rod or the corresponding area of the conducting wire rod is a physical boundary is judged.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the method can detect the continuous occurrence of various defects, and judge whether 2 or more than 2 defects exist in the detection area according to the slope of the information parameter-distance curve and the change condition of the slope if the information parameter-distance curve is abnormal and does not return for a long time or does not return until the detection is finished.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the standard information parameters are information parameters of a standard sample, the standard sample can be determined according to standards, and the standards are national standards, industry standards or enterprise standards.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the standard information parameter can also be determined by a user, or obtained by detection and/or calculation according to a standard sample determined by the user.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; when standard information parameters are acquired, the detection environment is the same as the actual detection environment, and the detection environment includes but is not limited to temperature, pressure, humidity and noise.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the applicable temperature range is 10K to the melting temperature or the liquefaction temperature or the gasification temperature of the conducting pole material to be measured.
The invention relates to a method for detecting the quality of a conductor pole based on continuous informationA method; the cross-sectional area of the wire guide pole is less than or equal to 1000mm2Preferably 100mm or less2More preferably 10mm or less2Still more preferably not more than 1mm2More preferably 0.5mm or less2。
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the information comprises but is not limited to voltage, current and position, and the acquisition method of the voltage and current information comprises but is not limited to a direct current four-point method, a single bridge method and a double bridge method; preferably a direct current four point process.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; during detection, the relationship among the information acquisition frequency, the relative movement speed between the wire guide pole and the detection device and the distance between the information acquisition contact ends is as follows: the relative movement speed ÷ information acquisition frequency < information acquisition contact end distance can ensure that all areas of a detection sample can be detected, the acquired information sample is enough for analysis, and the smaller the relative movement speed is, the larger the acquisition frequency is, and the more the acquired information sample is.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the information acquisition frequency is more than or equal to 1 time/10 seconds, preferably more than or equal to 1 time/second, and more preferably more than or equal to 10 times/second; the information acquisition frequency can also be set according to the length of the detection area, and within a detection interval of 10mm, the information acquisition frequency is more than or equal to 1 time, preferably more than or equal to 10 times, and more preferably more than or equal to 100 times; the information acquisition frequency can be optimized and adjusted according to the relative movement speed of the wire guide pole and the detection device and the characteristics of the information acquisition device.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; the distance between the 2 information acquisition contact ends is less than or equal to 3000mm, preferably less than or equal to 1000mm, more preferably less than or equal to 500mm, even more preferably less than or equal to 100mm, and even more preferably less than or equal to 50 mm.
The invention relates to a method based on continuous information detectionA method of guiding the quality of the pole; when the defect enters and leaves the detection area, the corresponding information parameter curve has a certain mapping relation, and the information acquisition system can be checked according to the mapping relation. In FIG. 2, the BD segment corresponds to the defect entering the detection area, the FH segment corresponds to the defect leaving the detection area, and the information parameters of the BD segment and the FH segment are ideally mapped to each other, i.e. for any point (X, Y) on the BD(X)) And mapped point on FH (X + l, Y)(X+l)) Existence of a relationship Y(X)'＝-Y(X+l)', where l is the length of the detection zone.
The invention relates to a method for detecting the quality of a conducting wire rod based on continuous information; there are many defect determination methods, and any defect determination method based on the present invention is considered to fall within the scope of protection of the present patent.
The invention also specially designs a device matched with the detection method; the device comprises P independent detection units, and when in detection, the P units can be completely or partially contacted with the conducting pole; the detection unit can be static or move according to a designed track, and the conductive wire rod can also be static or move according to a designed track; the detection unit and the conductive wire rod can move relatively; and P is an integer greater than or equal to 1.
The invention relates to a device for detecting the quality of a conducting wire rod based on continuous information; when the information parameters are detected by adopting a direct current four-point method, each detection unit comprises 4 binding posts which are arranged side by side, a constant current providing module, a temperature measuring module and an information acquisition module; two binding posts at two ends of the 4 binding posts are connected with the constant current providing module through a lead, and two binding posts in the middle are connected with the information acquisition module through leads; the temperature measurement module is connected with the information acquisition module.
The invention relates to a device for detecting the quality of a conducting wire rod based on continuous information; the binding post is connected with a contact end, the contact end comprises but is not limited to a conductive ball and a probe, and the conductivity of the binding post and the contact end is more than or equal to 6MS/m, preferably more than or equal to 30MS/m, and further preferably more than or equal to 46 MS/m; when the detection conducting wire pole is used, the detection conducting wire pole is in contact with the contact end and can move relatively.
The invention relates to a device for detecting the quality of a conducting wire rod based on continuous information; and a pressure sensing device is arranged between the binding post and the contact end and is used for adjusting the contact pressure of the binding post and the detection sample so as to prevent the detection sample from being damaged due to overlarge contact pressure or poor contact due to undersize contact pressure.
Compared with the prior art, the invention provides a scheme for detecting the quality of the conducting wire rod based on continuous information, which has the technical advantages that:
1. the invention can realize the on-line continuous detection of the wire guide pole, and the detection device and the wire guide pole can have various relative movement modes, thereby having great practical value for the continuous on-line detection.
2. The invention can be suitable for different detection places, can detect various materials, can realize online detection in different temperature environments, and can convert continuous information parameters at different temperatures.
3. The invention can detect the defect causing the resistance change and analyze the type of the defect, not only can detect the quality problem of the surface layer, but also can detect the internal defect, especially can detect the coexistence situation of 2 or more than 2 defects, and the prior art can not realize the function.
Drawings
FIG. 1 is a schematic diagram of an information parameter-distance curve corresponding to a defect and a position of a conductive wire rod;
FIG. 2 is a schematic diagram of an information parameter-distance curve;
FIG. 3 is a schematic diagram of a resistance-distance curve for a defect of decreasing diameter;
FIG. 4 is a schematic resistance-distance curve of a defect with an increasing diameter;
FIG. 5 is a schematic view of the detection apparatus of the present invention, wherein 1 is a signal acquisition module; 2 is a binding post; 3 is a binding post lifting device; 4 is a pressure sensor; 5 is a temperature measuring probe; 6 is a signal lead; 7 is a contact end;
FIG. 6 is a conductivity-distance curve of example 1;
FIG. 7 is a photograph of a defect in example 1;
FIG. 8 is a voltage-distance curve of example 2;
FIG. 9 is a photograph (front side) of a test sample of example 2;
FIG. 10 is a photograph (side view) of a test sample of example 2;
FIG. 11 is a resistivity-distance curve for example 3;
FIG. 12 is a photograph of a defect in example 3;
fig. 13 is a resistivity-distance curve for comparative example 1.
Detailed Description
In the specific implementation mode of the invention, direct current four-point method detection is adopted for detection, the detected ambient temperature is 20 +/-2 ℃, and the contact area between the contact end and the wire guide pole is less than or equal to 5mm2. The detection system automatically acquires voltage information, position information and size information in the relative motion of the conducting wire rod and the detection device, automatically calculates information parameters and draws an information parameter-distance curve.
The information parameter calculation adopts the following formula:
resistance (Ω) is voltage (V) ÷ current (a);
resistivity (Ω · m) is resistance (Ω) × cross-sectional area (m)2) Length (m);
conductivity (S/m) ÷ 1 ÷ resistivity (Ω · m);
electrical conductivity (% IACS) — electrical conductivity (MS/m) ÷ 0.58.
Example 1
Detection materials: an aluminum alloy wire with the diameter of 3.93mm and the length of 1500 mm;
terminal post spacing/detection zone length: 80 mm;
inputting a constant current: 0.15A;
the motion mode is as follows: the detection device is static, and the sample moves;
the moving speed of the sample is as follows: 30 mm/s;
signal acquisition frequency: 30 times/s;
standard conductivity: 61.4% IACS;
FIG. 6 is a graph of the obtained conductivity vs. distance, Wr0.001639, according to | obtained conductivity-standard conductivity |/standardQuasi-conductivity is not less than WrWhen the defect 1 is determined to exist, the conductivity abnormally increases in the position range of 451mm to 458mm, and Y is determined to enter the detection area corresponding to the defectmThe conductivity returns to normal within the position range of 531mm-538mm when the conductivity returns to 62.5 percent IACS, the coordinates of the starting point and the ending point of the defect are determined to be 531mm and 538mm respectively corresponding to the defect leaving the detection area, and the length of the defect area is 7 mm; defect decision factor Wy(62.5-61.4) ÷ 61.4 ═ 0.0179, due to the decision factor WyIf the defect type is more than 0, judging the possible defect type to be convex, and displaying the picture of figure 7 that the defect is a tumor-shaped convex.
Example 2
Detection materials: an aluminum alloy rolled bar, sample 1 having a cross-section of about 11.82mm by 8.45mm and a length of about 380 mm; sample 2 was approximately 9.30mm by 8.28mm in cross section and approximately 432mm long;
terminal post spacing/detection zone length: 40 mm;
inputting a constant current: 1.0A;
the motion mode is as follows: the detection device is static, and the sample moves;
the moving speed of the sample is as follows: 60 mm/s;
signal acquisition frequency: 60 times/s;
standard voltage signal: sample 1: 0.0225mV, sample 2: 0.0286 mV;
FIG. 8 is a graph of the voltage-distance curve obtained, Wr0.01750, according to | the obtained voltage signal-standard voltage signal |/standard voltage signal < WrJudging that the sample 1 is free of defects; according to the obtained voltage signal-standard voltage signal/standard voltage signal |/standard voltage signal ≥ WrJudging that 1 defect exists in the sample 2, the voltage rises abnormally within the position range of 219mm-235mm, the corresponding defect enters the detection area, and YmReturning the voltage to normal within the position range of 259mm-275mm under the condition of 0.0303mV, determining coordinates of a starting point and an ending point of the defect as 259mm and 275mm respectively corresponding to the defect leaving the detection area, and determining the length of the defect area as 16 mm; defect decision factor Wy(0.0303-0.0286) ÷ 0.0286 ═ 0.0594, due to the determination factor WyAnd if the defect type is larger than 0, judging the possible defect type to be smaller in size or crack. FIG. 9 is a photograph of the front of the sample, without any significant size reduction, and the sample side shown in FIG. 10The photographs show that the defect in sample 2 is roll cracking.
Example 3
Detection materials: an aluminum alloy wire with the diameter of 5mm and the length of 1400 mm;
terminal post spacing/detection zone length: 100 mm;
inputting a constant current: 0.55A;
the motion mode is as follows: the detection device is static, and the sample moves;
the moving speed of the sample is as follows: 30 mm/s;
signal acquisition frequency: 60 times/s;
standard resistivity: 2.8301X 10-8Ω·m；
FIG. 11 is a graph of the resistivity versus distance obtained, Wr0.001665, according to | the obtained resistivity-standard resistivity |/standard resistivity ≧ WrJudging that 1 defect exists, abnormally increasing the resistivity within the position range of 710mm-764mm, enabling the corresponding defect to enter a detection area, and Ym＝2.8734×10-8Omega m, the resistivity returns to normal within the position range of 810mm-864mm, the coordinates of the starting point and the ending point of the defect are respectively determined to be 810mm and 864mm corresponding to the defect leaving the detection area, and the length of the defect area is 54 mm; defect decision factor Wy＝(2.8734×10-8Ω·m-2.8301×10-8)÷2.8301×10-80.01530, due to defect decision factor Wy> 0 and the length of the defect region is long, it is determined that the possible defect type is scratch.
It was further found that the slope of the measured resistivity curve in the abnormal rising and falling phases changed significantly, with a slope of about 5.8X 10 in the rising phase from 710mm to 734mm-12The slope of the rising stage of omega m/mm, 760mm to 764mm is about 7.1X 10-11Omega m/mm, the slope of the descending stage of 810mm-834mm is about-5.8X 10-12The slope of the descending stage of omega m/mm and 860mm-864mm is about-7.1X 10-11Omega m/mm, and the defect at this position is judged to be composed of two types of defects. The first defect having a smaller absolute value of slope and a longer length, most likely scratch, the second defect having a larger absolute value of slope and a shorter length, most likely indentation or bubble, the length of the intermediate plateau between the two slopes being 26mm, indicating that the two areThe defects are about 26mm apart. Figure 12 photo shows defects as scratches and indentations.
Comparative example:
the detection mode is as follows: carrying out segmented discrete detection;
detection materials: an aluminum alloy wire rod with the diameter of 5mm and the length of 1400mm, which is the same detection sample as the aluminum alloy wire rod in the embodiment 3;
terminal post spacing/detection zone length: 100 mm;
inputting a constant current: 0.55A;
standard resistivity: 2.8301X 10-8Ω·m；
FIG. 13 is a graph of the resistivity versus distance curve obtained, Wr0.001665, because the distance between the middle 2 binding posts is 100mm, the measurement needs 14 times, the result of each detection is the result of averaging 100mm sections, and the resistivity obtained according to the ratio is-standard resistivity, |/standard resistivity is more than or equal to WrAnd judging that the 800mm-900mm position area has defects, and because only 14 discrete data points can not determine the specific degree and length of the defect, the possible defect types can not be judged. Example 3 detected defects in the 810mm-864mm zone and analyzed two types of defects, whereas this comparative example was not detectable.
The comparative example shows the disadvantages of discrete detection: the method has the advantages of needing to be divided in advance, having many detection times, being slow in detection speed, being unobvious in signals, being inaccurate in positioning, being incapable of further distinguishing types, being incapable of detecting the condition of extremely small defects and the like.
Claims (10)
1. A method for detecting the quality of a conducting wire rod based on continuous information is characterized in that: during detection, the detection device and the conducting wire rod can move relatively, and the quality of the conducting wire rod is judged by continuously acquiring information and calculating information parameters; the information includes but is not limited to voltage, current and position, the information is continuous information, and the continuous information is information for continuously acquiring different positions of the conductive wire rod; the information parameter is selected from at least one of resistance, resistivity, conductivity and voltage; and comparing the obtained information parameter with the standard information parameter, judging that the area corresponding to the obtained information parameter has defects when the value of the obtained information parameter-standard information parameter/standard information parameter is greater than or equal to a defect judgment threshold value, and judging that the quality of the area corresponding to the obtained information parameter is qualified when the value of the obtained information parameter-standard information parameter/standard information parameter is less than the defect judgment threshold value.
2. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 1, wherein: w for the defect judgment thresholdrDenotes that when the resulting information parameter is voltage and the unit used is V, the W isrThe value of (a) is greater than or equal to 0.0001, preferably 0.0001 to 0.1, more preferably 0.0001 to 0.01, and even more preferably 0.0001 to 0.001; when the information parameter is other information parameter, WrAnd carrying out corresponding conversion on the value of (A).
3. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 1 or 2, wherein: when the obtained information parameter-standard information parameter/standard information parameter is more than or equal to WrThen, judging that the detected area at least comprises 1 or 1 defect; calculating WyW is as describedy＝(Ym-Ys)÷YsSaid Y issAs a standard information parameter, the YmIs the maximum or minimum value of the obtained information parameter, WyIs a defect judgment factor; when the information parameter is voltage information and/or resistance and/or resistivity, Wy> 0, defect species include, but are not limited to, diameter reduction, scratching, indentation, denting, cracking, corrosion, Wy< 0, defect species including but not limited to bulge, diameter enlargement; when the information parameter is conductivity and/or electric conductivity, Wy< 0, defect species include, but are not limited to, diameter reduction, scratch, indentation, dent, crack, corrosion, Wy> 0, defect species include, but are not limited to, bulge, larger diameter.
4. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 1, wherein: the standard information parameters are information parameters of a standard sample, the standard sample can be determined according to standards, and the standards are national standards, industry standards or enterprise standards.
5. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 1, wherein: the standard information parameter can also be determined by a user, or obtained by detection and/or calculation according to a standard sample determined by the user.
6. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 4 or 5, wherein: when standard information parameters are acquired, the detection environment is the same as the actual detection environment, and the detection environment includes but is not limited to temperature, pressure, humidity and noise.
7. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 1, wherein: the cross-sectional area of the wire guide pole is less than or equal to 1000mm2Preferably 100mm or less2More preferably 10mm or less2Still more preferably not more than 1mm2More preferably 0.5mm or less2。
8. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 1, wherein: the continuous information acquisition method includes, but is not limited to, a direct current four-point method, a single bridge method and a double bridge method.
9. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 8, wherein: the detection device is contacted with the conducting wire pole through contact ends, and the contact area of any one contact end and the conducting wire pole is less than or equal to 100mm2Preferably 25mm or less2More preferably 1mm or less2More preferably 0.1mm or less2。
10. The method for detecting the quality of the conductive wire rod based on the continuous information as claimed in claim 1, wherein: the distance between the 2 information acquisition contact ends is less than or equal to 3000mm, preferably less than or equal to 1000mm, more preferably less than or equal to 500mm, even more preferably less than or equal to 100mm, and even more preferably less than or equal to 50 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811490863.6A CN111289811A (en) | 2018-12-07 | 2018-12-07 | Method for detecting quality of conductor pole based on continuous information |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811490863.6A CN111289811A (en) | 2018-12-07 | 2018-12-07 | Method for detecting quality of conductor pole based on continuous information |
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| CN111289811A true CN111289811A (en) | 2020-06-16 |
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Cited By (1)
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| CN116307939A (en) * | 2023-05-17 | 2023-06-23 | 国网安徽省电力有限公司合肥供电公司 | Cement pole quality intelligent pre-screening analysis system |
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