A production quality evaluation system applicable to road guardrails

Abstract

The present invention discloses a production quality evaluation system applicable to road guardrails, which relates to the technical field of guardrail production. It includes a tracking point setting end, a reference elongation rate acquisition end, a bending deformation uniformity acquisition end, and a quality evaluation end. It solves the technical problem that the existing quality inspection of road guardrails only focuses on the bending angle or shape, and ignores the elongation rate distribution of the material at the bending part. During the production process, by comparing the data of the waveform guardrail rods produced in real time with the reference data, and by comprehensively considering the tracking point deviation and deformation uniformity, a threshold value and a weight coefficient are set to calculate the bending fluctuation value to determine the quality grade of the waveform guardrail rods produced in real time, so as to realize the rapid evaluation of product quality, realize the real-time monitoring of the quality of the waveform guardrail rods during the production process, timely discover defective products, and prevent guardrail rods with quality hidden dangers from flowing into the market.

Description

Technical Field

[0001] The present invention belongs to the technical field of guardrail production, and specifically relates to a production quality evaluation system applicable to road guardrails. Background Art

[0002] In road construction, road guardrails, as important facilities for ensuring traffic safety, their production quality is directly related to the lives of road users. At present, corrugated guardrail poles are a common type of road guardrails. During the production process of corrugated guardrail poles, due to the influence of factors such as material properties and processing techniques, quality problems such as uneven bending deformation and dimensional deviation are likely to occur.

[0003] During the production process of corrugated road guardrail poles, the bending process is one of the key links. The bent guardrail poles need to meet specific geometric shapes and dimensional requirements. In particular, the bending extension amount at the bent part must be accurate to ensure the quality and safety of the products.

[0004] However, the traditional quality inspection method for corrugated guardrail poles mainly relies on manual sampling inspection. Measuring tools are used to measure the appearance dimensions, bending angles, etc. of the guardrail poles. This method has low efficiency and strong subjectivity, and cannot comprehensively and accurately evaluate the quality of the guardrail poles, making it difficult to meet the quality inspection requirements of large-scale production; resulting in guardrail poles with potential quality hazards flowing into the market, bringing risks to road traffic safety. Therefore, there is an urgent need for a system that can comprehensively and accurately evaluate the production quality of road guardrails.

[0005] At the same time, existing inspections only focus on the bending angle or shape, ignoring the elongation rate distribution of the material at the bent part, resulting in excessive local elongation and thus a risk of cracking or insufficient elongation and a risk of springback defects; based on this, a production quality evaluation system applicable to road guardrails is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a production quality evaluation system applicable to road guardrails, which solves the technical problem that existing inspections only focus on the bending angle or shape, ignoring the elongation rate distribution of the material at the bent part, resulting in excessive local elongation and thus a risk of cracking or insufficient elongation and a risk of springback defects.

[0007] A production quality evaluation system applicable to road guardrails includes:

[0008] A tracking point setting end, which determines the midpoint of the bending arc, the starting and ending points of the bending, the highest point of the wave crest, the lowest point of the wave trough, and the starting and ending points of the waveform conversion according to the processing image data of the corrugated guardrail pole, and sets tracking points at the midpoints of the upper and lower side lines and the front and rear end lines of the contour line of the original material pole, and then sets a plurality of tracking points on the original material pole;

[0009] The reference elongation acquisition end is used to obtain the contour image of the original material rod after being bent into a corrugated guardrail, determine the position coordinates of each tracking point, and calculate the reference elongation of each tracking point;

[0010] The bending deformation uniformity acquisition end is used to calculate the bending deformation uniformity of the corrugated guardrail according to the position coordinates of each tracking point in the corrugated contour image;

[0011] The quality evaluation end is used to obtain the tracking point deviation coefficient and the real-time deformation coefficient of the corrugated guardrail produced in real time, calculate its bending fluctuation value, and evaluate and determine the quality grade of the corrugated guardrail produced in real time according to the bending fluctuation value.

[0012] As a further solution of the present invention: The specific method for setting multiple tracking points on the original material rod is as follows:

[0013] According to the positions corresponding to the highest points of the wave crests and the lowest points of the wave troughs of the corrugated guardrail and the starting and ending points of the waveform conversion on the upper and lower side lines of the contour line of the original material rod, multiple tracking points on the original material rod are obtained. At the same time, the midpoints of the front and rear end lines of the contour line of the original material rod are used as tracking points, and then multiple tracking points are set on the original material rod.

[0014] As a further solution of the present invention: The specific method for obtaining the reference elongation of each tracking point is as follows:

[0015] Obtain the contour images of each original material rod after being bent into a corrugated guardrail, obtain the position coordinates corresponding to each tracking point from each corrugated contour image, randomly select one from each tracking point without replacement as the target tracking point, obtain the position coordinates corresponding to the target tracking point in each corrugated contour image, obtain the position coordinates of the target tracking point on the contour line of the original material rod as the original reference point coordinates of the target tracking point. At the same time, obtain the material length L0 of the original material rod, and then obtain the extension distance between the target tracking point and the original reference point in each corrugated contour image. Take the product of the ratio between each extension distance La and the material length L0 and one hundred as the extension rate Ra corresponding to the target tracking point in each corrugated contour image. Screen and analyze the extension rate Ra, and obtain the reference elongation F1 corresponding to the target tracking point according to the analysis result. Traverse each tracking point, and use the same analysis method to analyze the position coordinates corresponding to each tracking point in each corrugated contour image to obtain the reference elongation Fe corresponding to each tracking point in the corrugated guardrail, where a represents different corrugated contour images, a = 1, 2,..., c, c represents the total number of each corrugated contour image, c is a positive integer, and c satisfies c≥2, e represents different tracking points, e is a positive integer and e satisfies 12≥e≥1.

[0016] As a further solution of the present invention: the specific method for screening and analyzing the elongation rate and obtaining the reference elongation rate corresponding to the target tracking point according to the analysis result is as follows:

[0017] Obtain the value Rr in the elongation rate Ra that satisfies the preset screening condition: |Ra - Rp| ≥ Y2, where r represents different values in Ra that satisfy the preset screening condition A1, r = 1, 2,..., b, b represents the total number of values Rr, b is a positive integer, and b satisfies c ≥ b ≥ 1. When the quantity b is greater than or equal to the preset threshold Y1, the mean value Rp of the elongation rate Ra is defined as the reference elongation rate F1 corresponding to the target tracking point. When the quantity b is less than the preset threshold Y1, the mean value of the maximum and minimum values in the elongation rate Ra is defined as the reference elongation rate F1 corresponding to the target tracking point.

[0018] As a further solution of the present invention: the specific method for obtaining the material length L0 of the original material rod is as follows:

[0019] Take the distance between the tracking points at the midpoints of the front and rear end lines on the contour line of the original material rod as the material length L0 of the original material rod.

[0020] As a further solution of the present invention: the specific method for calculating the bending deformation uniformity of the corrugated guardrail rod is as follows:

[0021] Randomly select a waveform contour diagram from each waveform contour diagram without replacement as the analysis contour diagram; mark the position coordinates corresponding to each tracking point in the analysis contour diagram as He (Hxe, Hye), take the mean values Hxp and Hyp of the abscissa and ordinate of each tracking point as the centroid coordinates Z (Zx, Zy) of the tracking point in the analysis contour diagram, obtain the standard deviation U1 of the distances between each tracking point and the centroid in the analysis contour diagram, and use the same analysis method to analyze the position coordinates of each tracking point in the remaining waveform contour diagrams, so as to obtain the standard deviations Ua corresponding to each waveform contour diagram respectively. Obtain the mean value of the maximum and minimum values in the standard deviation Ua and use it as the bending deformation uniformity WZ corresponding to the corrugated guardrail rod.

[0022] As a further solution of the present invention: the specific method for obtaining the tracking point deviation coefficient of the real-time produced corrugated guardrail rod is as follows:

[0023] Obtain the real-time waveform contour diagram of the corrugated guardrail produced in real time, and import it into the reference elongation acquisition end. Obtain the real-time elongation corresponding to each tracking point in the real-time waveform contour diagram, obtain the absolute value of the difference between the real-time elongation corresponding to each tracking point in the real-time waveform contour diagram and the reference elongation respectively, mark the tracking points with the absolute value of the difference greater than the preset threshold Y3 as deviation tracking points, obtain the number of deviation tracking points, and use the ratio between the number of deviation tracking points and the total number of tracking points as the tracking point deviation coefficient PX of the corrugated guardrail produced in real time.

[0024] The specific method for obtaining the real-time bending deformation degree of the corrugated guardrail produced in real time is as follows:

[0025] Obtain the real-time coordinates corresponding to each tracking point in the real-time waveform contour diagram of the corrugated guardrail produced in real time, input them into the bending deformation uniformity acquisition end, obtain the real-time bending deformation degree corresponding to the real-time waveform contour diagram of the corrugated guardrail produced in real time, obtain the absolute value of the difference between the real-time bending deformation degree and the bending deformation uniformity, and use the ratio between the absolute value of the difference and the bending deformation uniformity as the real-time deformation coefficient BX of the corrugated guardrail produced in real time.

[0026] Take the sum of the products of the tracking point deviation coefficient and the real-time deformation coefficient of the corrugated guardrail produced in real time and the preset weight coefficients β1 and β2 respectively as the bending fluctuation value of the corrugated guardrail produced in real time, where β1 and β2 satisfy 1 = β1 + β2 and β1 > β2.

[0027] When the bending fluctuation value of the corrugated guardrail produced is greater than the preset threshold Y4 and less than or equal to the preset threshold Y5, it is determined that the quality grade of the corrugated guardrail produced in real time is the medium quality grade. When the bending fluctuation value is less than or equal to the preset threshold Y4, it is determined that the quality grade of the corrugated guardrail produced in real time is the upper quality grade. When the bending fluctuation value is greater than the preset threshold Y5, it is determined that the quality grade of the corrugated guardrail produced in real time is the lower quality grade. The upper quality grade is higher than the medium quality grade, and the medium quality grade is higher than the medium quality grade. The preset threshold Y5 is greater than Y4.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] (1) In the present invention, by setting multiple tracking points and monitoring their displacements and elongations in real time during the bending process, the deformation uniformity of the corrugated guardrail during the bending process can be accurately evaluated, making up for the deficiency of traditional methods that only focus on the bending angle or shape. It can comprehensively evaluate the elongation of each tracking point, ensure that the elongation amount in the bending area is within a reasonable range, and thus avoid quality problems caused by excessive or insufficient elongation.

[0030] (2) In the present invention, by calculating the reference elongation rate and the overall bending deformation uniformity of each tracking point based on actual production data, the production quality of the corrugated guardrail can be quantified, local over - or under - elongation situations that may occur during the production process can be detected in a timely manner, and it is ensured that the shape and size of the corrugated guardrail meet the predetermined requirements.

[0031] (3) In the present invention, during the production process, by comparing the data of the real - time produced corrugated guardrail with the reference data, and by comprehensively considering the tracking point deviation and deformation uniformity, a threshold value and a weight coefficient are set to calculate the bending fluctuation value to determine the quality grade of the real - time produced corrugated guardrail, realizing a rapid assessment of the product quality, real - time monitoring of the quality of the corrugated guardrail during the production process, detecting defective products in a timely manner, preventing guardrails with quality hidden dangers from flowing into the market, ensuring road traffic safety, and effectively guaranteeing the quality of road guardrail products, thereby ensuring the quality stability of the corrugated guardrail during the entire production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the system framework structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the structure of the original material contour line and the corrugated contour image of the present invention;

[0034] Figure 3 It is a schematic diagram of the material length of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0036] Embodiment 1: Please refer to Figure 1 、 Figure 2 and Figure 3 , the present application provides a production quality assessment system applicable to road guardrails, including;

[0037] A tracking point setting end, which sets a plurality of original material rods with the same specifications, and sets a plurality of tracking points on the original material rods according to the processing image data of the corrugated guardrail. The specific method is as follows:

[0038] Based on the bending arc mid - points, bending start and end points of the corrugated guardrail in the processing image data of the corrugated guardrail, set the tracking points of the corrugated guardrail. At the same time, use laser - etched two - dimensional codes or spray red fluorescent dots to actually mark each tracking point with associated coordinate information, or use DIC technology to define grid points to virtually mark each tracking point. The technologies used above are all existing and mature technologies, so no more details will be given here. Thus, the setting of multiple tracking points is achieved;

[0039] Obtain the contour line of the raw material rod. According to the position points corresponding to the highest peak and lowest valley of the corrugated guardrail in the upper and lower side lines of the contour line of the raw material rod in the processing image data of the corrugated guardrail and the waveform conversion start and end points in the processing image data of the corrugated guardrail, obtain multiple tracking points on the raw material rod. At the same time, take the mid - points of the front and rear end lines of the contour line of the raw material rod as tracking points. Thus, obtain each tracking point on the contour line of the raw material rod to ensure full coverage of the entire bending area;

[0040] The processing image data of the corrugated guardrail can be obtained from the processing end or from the processing drawings. At the same time, the waveform conversion start point is defined as the first folding point where the waveform appears on the corrugated guardrail, and the waveform conversion end point is defined as the first node after the waveform ends. The above are all existing technologies, so no more details will be given here;

[0041] The positions of the tracking points at the upper and lower side lines of the contour line of the raw material rod correspond one by one. The tracking points at the upper side line are respectively marked as i, and the tracking points at the lower side line are respectively marked as i″. The specific values of i are: 2, 3, 4, 5, and 6;

[0042] Mark the tracking points at the mid - points of the front and rear end lines of the contour line of the raw material rod as 1 and 7 respectively;

[0043] Determine the key points based on the processing image data of the corrugated guardrail, and set and mark the tracking points on the raw material rod. The principle is to accurately locate the tracking points by identifying characteristic positions such as the bending arc mid - point and bending start and end points, combined with image analysis technology, to ensure coverage of the entire bending area, provide key measurement points for subsequent monitoring, and ensure the comprehensiveness and accuracy of data collection.

[0044] The reference elongation rate acquisition end is used to obtain the contour image after the raw material rod is bent into a corrugated guardrail, and use it as the waveform contour image of each raw material rod. Obtain the position coordinates corresponding to each tracking point from each waveform contour image, and at the same time analyze them with the position coordinates of each tracking point on the contour line of the raw material rod. Thus, obtain the reference elongation rate corresponding to each tracking point in the corrugated guardrail. The specific method is as follows:

[0045] Mark the position coordinates of each tracking point on the original material rod as Ee (Exe, Eye), where e represents different tracking points, e is a positive integer and e satisfies 12 ≥ e ≥ 1;

[0046] Randomly select one from each tracking point without replacement as the target tracking point;

[0047] Obtain the position coordinates Aa (Axa, Aya) corresponding to the target tracking point in each waveform profile image, where a represents different waveform profile images, a = 1, 2,..., c, c represents the total number in each waveform profile image, c is a positive integer, and c satisfies c ≥ 2;

[0048] Obtain the position coordinates of the target tracking point on the outline line of the original material rod as the original reference point O coordinates O (Ox, Oy) of the target tracking point. According to the position coordinates of the tracking points at the midpoints of the front and rear end lines on the outline line of the original material rod, obtain the material length L0 of the original material rod;

[0049] By the distance formula, ; According to the original coordinates O (Ox, Oy) of the target tracking point on the outline line of the original material rod and the position coordinates Aa (Axa, Aya) corresponding to the target tracking point in each waveform profile image, calculate the extension distance La between the target tracking point and the original reference point O in each waveform profile image;

[0050] Take the product of the ratio between each extension distance La and the material length L0 and one hundred as the extension rate Ra corresponding to the target tracking point in each waveform profile image, that is: Ra = (La / L0) × 100%;

[0051] Obtain the value Rr that satisfies the preset screening condition A1 in the extension rate Ra, where r represents different values that satisfy the preset screening condition A1 in Ra, r = 1, 2,..., b, b represents the total number of values Rr, b is a positive integer, and b satisfies c ≥ b ≥ 1. Compare the quantity b with the preset threshold Y1. When the quantity b is greater than or equal to the preset threshold Y1, it means that the number of values of the extension rate Ra that satisfy the preset screening condition A1 is relatively large, and the mean value of the extension rate Ra is representative. Then, define the mean value Rp of the extension rate Ra as the reference extension rate F1 corresponding to the target tracking point. When the quantity b is less than the preset threshold Y1, it means that the number of values of the extension rate Ra that satisfy the preset screening condition A1 is relatively small, and the mean value of the extension rate Ra is not representative. Then, define the mean value of the maximum and minimum values in the extension rate Ra as the reference extension rate F1 corresponding to the target tracking point, that is, F1 = (Rmin + Rmax) / 2, where Rmax and Rmin are the maximum and minimum values in Ra respectively;

[0052] Here, the preset condition A1 is specifically: |Ra - Rp| ≥ Y2, where Y2 is a preset value, and the specific values of Y1 and Y2 are determined by relevant personnel according to actual needs;

[0053] Traverse each tracking point, and use the same analysis method to analyze the position coordinates corresponding to each tracking point in each waveform profile image, and obtain the reference elongation rate Fe corresponding to each tracking point in the corrugated guardrail;

[0054] By obtaining the contour image of the corrugated guardrail after bending, determining the position coordinates of the tracking points, and calculating the reference elongation rate corresponding to each tracking point in the corrugated guardrail in combination with the original material length, the principle is to use image processing and coordinate analysis techniques to compare the geometric changes of the material before and after bending, and quantify the elongation of the material at the bending point. It provides reference data for evaluating material deformation and helps to accurately analyze the elongation performance of the material during the bending process.

[0055] The bending deformation uniformity acquisition end obtains the bending deformation uniformity corresponding to the corrugated guardrail according to the position coordinates corresponding to each tracking point in each waveform profile image. The specific method is as follows:

[0056] Randomly select a waveform profile image from each waveform profile image without replacement as the analysis profile image;

[0057] Mark the position coordinates corresponding to each tracking point in the analysis profile image as He (Hxe, Hye), and take the mean values Hxp and Hyp of the abscissa and ordinate of each tracking point as the centroid coordinates Z (Zx, Zy) of the tracking point in the analysis profile image;

[0058] Through the formula: ; obtain the distance ZHe between each tracking point and the centroid Z in the analysis profile image, obtain the standard deviation U1 of ZHe, and use the same analysis method to analyze the position coordinates of each tracking point in the remaining waveform profile images, and then obtain the standard deviation Ua corresponding to each waveform profile image;

[0059] Obtain the mean value of the maximum and minimum values in the standard deviation Ua, and take it as the bending deformation uniformity WZ corresponding to the corrugated guardrail;

[0060] Based on the position coordinates of the tracking points in the waveform profile image, calculate the bending deformation uniformity of the corrugated guardrail. By analyzing the spatial distribution of the tracking points and the change in their distance from the centroid, quantify the uniformity of material deformation during the bending process, which can effectively identify problems of non-uniform material deformation and provide guidance for optimizing the bending process parameters.

[0061] Embodiment 2: As Embodiment 2 of the present invention, when the present application is specifically implemented, compared with Embodiment 1, the difference in the technical solution of this embodiment from that of Embodiment 1 is only that this embodiment further includes a quality evaluation terminal;

[0062] The quality evaluation terminal obtains the real-time waveform profile of the waveform guardrail produced in real time and imports it into the reference elongation acquisition terminal, obtains the real-time elongation Se corresponding to each tracking point in the real-time waveform profile respectively, compares and analyzes the real-time elongation Se corresponding to each tracking point in the real-time waveform profile with the reference elongation Fe corresponding to each tracking point in the waveform guardrail one by one, marks the deviation tracking points in the waveform guardrail produced in real time, then analyzes the deviation tracking points to obtain the tracking point deviation coefficient of the waveform guardrail produced in real time. At the same time, according to the real-time coordinates corresponding to each tracking point in the real-time waveform profile, the real-time bending deformation degree of the real-time waveform profile is obtained, and it is compared and analyzed with the bending deformation uniformity WZ corresponding to the waveform guardrail to obtain the real-time deformation coefficient of the waveform guardrail produced in real time. The bending fluctuation value of the waveform guardrail produced in real time is obtained according to the tracking point deviation coefficient and the real-time deformation coefficient of the waveform guardrail produced in real time, and the quality evaluation grade of the waveform guardrail produced in real time is determined and obtained;

[0063] The specific method for obtaining the tracking point deviation coefficient of the waveform guardrail produced in real time is as follows:

[0064] Obtain the absolute value of the difference Ve between the real-time elongation Se corresponding to each tracking point in the real-time waveform profile and the reference elongation Fe respectively;

[0065] Mark the tracking points with the absolute value of the difference Ve greater than the preset threshold Y3 as deviation tracking points, obtain the number of deviation tracking points, and use the ratio between the number of deviation tracking points and the total number of tracking points as the tracking point deviation coefficient PX of the waveform guardrail produced in real time;

[0066] The specific method for obtaining the real-time bending deformation degree of the waveform guardrail produced in real time is as follows:

[0067] Obtain the real-time coordinates corresponding to each tracking point in the real-time waveform profile of the waveform guardrail produced in real time, input them into the bending deformation uniformity acquisition terminal, obtain the real-time bending deformation degree ZB corresponding to the real-time waveform profile of the waveform guardrail produced in real time, obtain the absolute value of the difference between the real-time bending deformation degree ZB and the bending deformation uniformity WZ, and use the ratio between the absolute value of the difference and the bending deformation uniformity WZ as the real-time deformation coefficient BX of the waveform guardrail produced in real time;

[0068] The sum of the products of the tracking point deviation coefficient PX and the real-time deformation coefficient BX of the real-time production corrugated guardrail with the preset weight coefficients β1 and β2 respectively is used as the bending fluctuation value WD of the real-time production corrugated guardrail. When the bending fluctuation value WD of the production corrugated guardrail is greater than the preset threshold Y4 and less than or equal to the preset threshold Y5, the quality grade of the real-time production corrugated guardrail is determined to be the medium quality grade. When the bending fluctuation value WD is less than or equal to the preset threshold Y4, the quality grade of the real-time production corrugated guardrail is determined to be the upper quality grade. When the bending fluctuation value WD is greater than the preset threshold Y5, the quality grade of the real-time production corrugated guardrail is determined to be the lower quality grade. The upper quality grade is higher than the medium quality grade, and the medium quality grade is higher than the medium quality grade;

[0069] It should be noted that the specific values of the preset thresholds Y3, Y4, and Y5 are all determined by relevant personnel according to actual needs. The preset threshold Y5 is greater than Y4. At the same time, the specific values of the preset weight coefficients β1 and β2 are also determined by relevant personnel according to actual needs. The preset weight coefficients β1 and β2 satisfy 1 = β1 + β2 and β1 > β2;

[0070] By comparing the data of the real-time production corrugated guardrail with the reference data, calculating the bending fluctuation value to determine the quality grade, comprehensively considering the tracking point deviation and deformation uniformity, and setting thresholds and weight coefficients, the rapid evaluation of product quality is realized. Real-time monitoring and evaluation of product quality can timely detect defects, improve production efficiency and product quality stability.

[0071] The tracking point setting end determines the key positions based on the processed image data of the corrugated guardrail, sets the tracking points by actual or virtual marking methods, provides a positioning basis for subsequent detection, and ensures the accuracy and traceability of the detection data; the reference elongation acquisition end obtains the reference elongation by comparing the position coordinates of the tracking points before and after bending, using mathematical calculations and screening rules, which can accurately quantify the deformation degree of each part of the guardrail and provide key data for quality evaluation; the bending deformation uniformity acquisition end uses the centroid and standard deviation principles to analyze the distribution of tracking points in the waveform contour diagram to obtain the bending deformation uniformity, which effectively reflects the uniformity of the overall deformation of the guardrail; the quality evaluation end compares the real-time and reference data, combines the preset thresholds and weights to calculate the bending fluctuation value, realizes the accurate determination of the quality grade of the real-time production guardrail, timely discovers quality problems, realizes automated, multi-dimensional, and accurate quality evaluation, can comprehensively detect various quality problems in the production of guardrails, effectively improve the detection efficiency and accuracy, reduce quality risks, ensure the production quality of road guardrails, provide reliable guarantee for road traffic safety, effectively avoid defects caused by uneven bending, improve production efficiency, and ensure the quality consistency of corrugated guardrails.

[0072] Embodiment 3: As the third embodiment of the present invention, in the specific implementation of this application, compared with Embodiment 1 and Embodiment 2, the technical solution of this embodiment lies in the combined implementation of the solutions of the above-mentioned Embodiment 1 and Embodiment 2.

[0073] The above formulas are all calculated by taking the numerical values after dimensionlessization. The formula is a formula obtained by collecting a large amount of data for software simulation to get the closest real situation. The preset parameters and threshold selection in the formula are set by those skilled in the art according to the actual situation.

[0074] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A production quality evaluation system applicable to road guardrails, characterized in that, including; A tracking point setting end, which determines the midpoint of the bending arc, the starting and ending points of bending, the highest point of the wave crest, the lowest point of the wave trough, and the starting and ending points of waveform conversion according to the processed image data of the corrugated guardrail, and sets tracking points at the midpoints of the upper and lower side lines and the front and rear end lines of the contour line of the original material rod, and then sets multiple tracking points on the original material rod; A reference elongation rate obtaining end, which is used to obtain the contour image after the original material rod is bent into a corrugated guardrail, determine the position coordinates of each tracking point, and calculate and obtain the reference elongation rate of each tracking point; A bending deformation uniformity obtaining end, which is used to calculate and obtain the bending deformation uniformity of the corrugated guardrail according to the position coordinates of each tracking point in the waveform contour image; A quality assessment terminal, which is used to obtain a real-time waveform profile diagram of a corrugated guardrail produced in real time and import it into a reference elongation acquisition terminal ， Obtain the real-time elongation corresponding to each tracking point in the real-time waveform profile diagram, obtain the absolute value of the difference between the real-time elongation corresponding to each tracking point in the real-time waveform profile diagram and the reference elongation respectively, mark the tracking points with the absolute value of the difference greater than the preset threshold Y3 as deviation tracking points, obtain the number of deviation tracking points, take the ratio between the number of deviation tracking points and the total number of tracking points as the tracking point deviation coefficient PX of the corrugated guardrail produced in real time, obtain the real-time coordinates corresponding to each tracking point in the real-time waveform profile diagram of the corrugated guardrail produced in real time, input it into the bending deformation uniformity acquisition terminal, obtain the real-time bending deformation degree corresponding to the real-time waveform profile diagram of the corrugated guardrail produced in real time, obtain the absolute value of the difference between the real-time bending deformation degree and the bending deformation uniformity, take the ratio between the absolute value of the difference and the bending deformation uniformity as the real-time deformation coefficient BX of the corrugated guardrail produced in real time, obtain the tracking point deviation coefficient and the real-time deformation coefficient of the corrugated guardrail produced in real time, calculate its bending fluctuation value according to the tracking point deviation coefficient and the real-time deformation coefficient of the corrugated guardrail produced in real time, and conduct a quality grade assessment and determination on the corrugated guardrail produced in real time according to the bending fluctuation value.

2. The production quality evaluation system for road guardrails according to claim 1, characterized in that, The specific method for setting multiple tracking points on the original material rod is as follows: According to the positions corresponding to the highest point of the wave crest and the lowest point of the wave trough of the corrugated guardrail and the starting and ending points of waveform conversion on the upper and lower side lines of the contour line of the original material rod, multiple tracking points on the original material rod are obtained, and at the same time, the midpoints of the front and rear end lines of the contour line of the original material rod are used as tracking points, and then multiple tracking points are set on the original material rod.

3. The production quality evaluation system for road guardrails according to claim 2, wherein, The specific method for obtaining the reference elongation rate of each tracking point is as follows: Obtain the contour image after each original material rod is bent into a corrugated guardrail, obtain the position coordinates corresponding to each tracking point from each waveform contour image, randomly select one as the target tracking point without replacement from each tracking point, obtain the position coordinates corresponding to the target tracking point in each waveform contour image, obtain the position coordinates of the target tracking point on the contour line of the original material rod as the original comparison point coordinates of the target tracking point, and at the same time obtain the material length L0 of the original material rod, then obtain the extension distance between the target tracking point and the original comparison point in each waveform contour image, and take the product of the ratio between each extension distance La and the material length L0 and one hundred as the extension rate Ra corresponding to the target tracking point in each waveform contour image. Screen and analyze the extension rate Ra, and obtain the reference elongation rate F1 corresponding to the target tracking point according to the analysis result. Traverse each tracking point, and use the same analysis method to analyze the position coordinates corresponding to each tracking point in each waveform contour image, and obtain the reference elongation rate Fe corresponding to each tracking point in the corrugated guardrail, where a represents different waveform contour images, a = 1, 2,..., c, c represents the total number of each waveform contour image, c is a positive integer, and c satisfies c≥2, e represents different tracking points, e is a positive integer and e satisfies 12≥e≥1.

4. The production quality evaluation system for road guardrails according to claim 3, characterized in that, The specific method for screening and analyzing the elongation rate and obtaining the reference elongation rate corresponding to the target tracking point according to the analysis result is as follows: Obtain the value Rr in the elongation rate Ra that satisfies the preset screening condition: |Ra - Rp| ≥ Y2, where r represents different values in Ra that satisfy the preset screening condition A1, r = 1, 2, ……, b, b represents the total number of values Rr, b is a positive integer, and b satisfies c ≥ b ≥ 1. When the quantity b is greater than or equal to the preset threshold Y1, define the mean Rp of the elongation rate Ra as the reference elongation rate F1 corresponding to the target tracking point. When the quantity b is less than the preset threshold Y1, define the mean of the maximum and minimum values in the elongation rate Ra as the reference elongation rate F1 corresponding to the target tracking point.

5. The production quality evaluation system for road guardrails according to claim 3, characterized in that, The specific method for obtaining the material length L0 of the original material rod is: Take the distance between the tracking points at the midpoints of the front and rear end lines on the contour line of the original material rod as the material length L0 of the original material rod.

6. The production quality evaluation system for road guardrails according to claim 4, characterized in that, The specific method for calculating the bending deformation uniformity of the corrugated guardrail rod is: Randomly select a waveform contour diagram from each waveform contour diagram without replacement as the analysis contour diagram; mark the position coordinates corresponding to each tracking point in the analysis contour diagram as He (Hxe, Hye), take the mean values Hxp and Hyp of the abscissa and ordinate of each tracking point as the centroid coordinates Z (Zx, Zy) of the tracking point in the analysis contour diagram, obtain the standard deviation U1 of the distances between each tracking point and the centroid in the analysis contour diagram, and use the same analysis method to analyze the position coordinates of each tracking point in the remaining waveform contour diagrams, and then obtain the standard deviations Ua corresponding to each waveform contour diagram respectively. Obtain the mean of the maximum and minimum values in the standard deviation Ua and use it as the bending deformation uniformity WZ corresponding to the corrugated guardrail rod.

7. The production quality evaluation system for road guardrails according to claim 1, characterized in that, The specific method for calculating the bending fluctuation value is: Take the sum of the products of the tracking point deviation coefficient and the real-time deformation coefficient of the real-time produced corrugated guardrail rod and the preset weight coefficients β1 and β2 respectively as the bending fluctuation value of the real-time produced corrugated guardrail rod, where β1 and β2 satisfy 1 = β1 + β2 and β1 > β2.

8. The production quality evaluation system for road guardrails according to claim 7, characterized in that, The specific method for evaluating and determining the quality grade of the real-time produced corrugated guardrail rod according to the bending fluctuation value is: When the bending fluctuation value of the produced corrugated guardrail rod is greater than the preset threshold Y4 and less than or equal to the preset threshold Y5, then determine that the quality grade of the real-time produced corrugated guardrail rod is the medium quality grade. When the bending fluctuation value is less than or equal to the preset threshold Y4, then determine that the quality grade of the real-time produced corrugated guardrail rod is the upper quality grade. When the bending fluctuation value is greater than the preset threshold Y5, then determine that the quality grade of the real-time produced corrugated guardrail rod is the lower quality grade. The upper quality grade is higher than the medium quality grade, and the medium quality grade is higher than the medium quality grade. The preset threshold Y5 is greater than Y4.

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