A device for detecting appearance defects of a car light-emitting logo

Abstract

The application discloses a kind of automobile luminous logo appearance defect detection device, it is related to the technical field of automobile logo appearance detection tool, including cabinet;The present application is convenient for detecting the appearance of logo, breakage and brightness defect by the cooperation of breakage detection mechanism and brightness detection mechanism;Through the processing of gray block, contour plotting and abnormal marking of analysis module, the area that logo surface may exist defect is accurately positioned, and the position information of these areas is transmitted to execution module, when laser detection is controlled, these abnormal areas are scanned preferentially, the omission or misjudgment caused by blind laser scanning is avoided, laser detection is more targeted, and the accuracy of defect detection is improved;By executing cleaning operation first and then laser scanning, it can effectively distinguish whether the protrusion is caused by adherend or the protrusion formed by logo itself material, ensure the accuracy of protrusion defect judgment, and reduce unnecessary loss caused by misjudgment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile logo appearance detection tools, and in particular relates to a device for detecting appearance defects of an automobile light-emitting logo. BACKGROUND

[0002] As an important part of automobile brand identification and appearance decoration, the appearance quality of the automobile light-emitting logo directly affects the brand image and market competitiveness of the automobile. With the continuous improvement of consumer requirements for automobile quality and the increasing strictness of product quality control in the automobile manufacturing industry, higher standards are required for the appearance defect detection of the automobile light-emitting logo. Not only physical defects such as surface damage and scratches of the logo need to be detected, but also optical defects such as uneven light-emitting brightness and abnormal light-emitting area need to be accurately detected.

[0003] To improve detection efficiency, some enterprises have introduced simple automated detection equipment. However, the existing equipment still has obvious limitations. For example, traditional detection equipment mostly uses a single detection method, which can only complete single detection of appearance scratches or brightness, and cannot realize simultaneous detection of multi-dimensional defects, requiring multiple handling and detection, increasing the complexity of the process and detection time. The positioning mechanism of some equipment has poor adaptability, and the socket cannot be accurately inserted during brightness detection. In addition, the sorting function of the existing equipment is not perfect, and the qualified and unqualified products after detection need to be sorted manually, which cannot realize the integration of detection and sorting, increasing the labor cost and error risk.

[0004] Therefore, the above problems need to be improved. SUMMARY

[0005] The purpose of the present application is to solve the problems in the prior art and provide a device for detecting appearance defects of an automobile light-emitting logo.

[0006] To achieve the above purpose, the present application adopts the following technical scheme: a device for detecting appearance defects of an automobile light-emitting logo, comprising a cabinet, an entrance and an exit are formed on one side of the cabinet, a first conveyor belt and a second conveyor belt are respectively installed in the entrance and the exit, a mechanical arm is installed on one side of the first conveyor belt and the second conveyor belt, a grabbing mechanism is installed at the other end of the mechanical arm, the mechanical arm is located inside the cabinet, a turntable is installed inside the cabinet, a rotating mechanism is installed at the lower end of the turntable, a plurality of positioning mechanisms are installed equidistantly on the top surface of the turntable, an industrial camera, a damage detection mechanism, a brightness detection mechanism and a support rod are installed in sequence on the periphery of the turntable, and a sorting mechanism is installed on the support rod.

[0007] A smart control assembly is arranged inside the cabinet, and the smart control assembly comprises an analysis module.

[0008] The analysis module receives the acquired data, analyzes the image data, filters out abnormal grayscale blocks to obtain the analysis image, compares the grayscale values ​​in the analysis image, draws the outline of the logo, and analyzes the abnormalities within the logo outline. If it is dirt, a cleaning signal is generated and transmitted to the execution module; if it is a dent defect, a dent warning signal is generated and transmitted to the execution module; if it is a protrusion defect, it is cleaned and then inspected again. If it is still determined to be abnormal, a protrusion warning signal is generated and transmitted to the execution module.

[0009] Preferably, the analysis module performs the following steps for analyzing image data:

[0010] S1: Data collected at the same time The image data is processed into grayscale and divided into several grayscale blocks of the same size according to the size of the pixel blocks. The grayscale blocks are then numbered according to the row and column number of the divided image blocks.

[0011] S2: Acquire the grayscale value data for each grayscale block and calculate... The average gray value of the corresponding numbered gray block in each image data. and standard deviation The calculated mean and standard deviation Detect the fluctuation range of grayscale data The setting marks detected grayscale values ​​outside the fluctuation range as abnormal grayscale values, and tracks the number of detected abnormal grayscale values. If statistics are performed, If so, it is determined that the image detected at the corresponding time point is abnormal. The preset scaling factor is used; after removing abnormal grayscale values, the average of the remaining grayscale values ​​is calculated. The calculation, using the calculated mean This serves as the grayscale value data corresponding to the grayscale block;

[0012] S3: Data collected at the corresponding time. The image with the fewest abnormal gray levels in the image data is selected as the analysis image. The gray value of the corresponding numbered gray block in the analysis image is compared with the preset logo gray value fluctuation range. If the gray value of the corresponding numbered gray block is within the preset logo gray value fluctuation range, the corresponding gray block is determined to be the logo gray block.

[0013] S4: Convert the grayscale value of the logo grayscale block gray values ​​of adjacent gray blocks If a comparison is made, , it is determined that the corresponding logo gray block is a logo boundary gray block, and the gray difference boundary line between the logo boundary gray block and the adjacent gray block is a logo contour line, is a preset difference threshold value; the logo contour line is connected, and the drawn contour line is compared with the logo contour. If the two are proportional, it is determined that the contour is accurate;

[0014] S5: Mark the number of gray blocks with abnormal gray values inside the contour line, randomly select a marked gray block, and calculate the distance data between the marked gray block and the nearest contour line , and pass the distance data and the number of the nearest contour line to the execution module, which is the number of the corresponding marked gray block.

[0015] Preferably, the analysis module performs the following steps in the analysis of the laser scanning distance data:

[0016] K1: If , it is determined that there is an anomaly at the detection position, is a preset difference threshold value; if , it is determined that the gray anomaly at the detection position is caused by dirt, a cleaning signal is generated, and the cleaning signal is passed to the execution module, is the distance data fed back by scanning, is the distance data at the corresponding position of the standard part;

[0017] K2: If , it is determined that there is a depression at the anomaly detection position; otherwise, it is determined that there is a protrusion; when laser scanning the gray blocks with abnormal gray values inside the contour line, the laser moves in the range corresponding to the gray block until stops moving, and the distance data detected during the movement is recorded; the area of the defect position is divided into several laser-sized columns, and the number of columns corresponding to the defect is recorded According to the recorded distance data , the defect volume data of the defect position is calculated.

[0018] K3: The total number of columns corresponding to the defects on the logo and the total defect volume data are calculated. If the defect is a depression, the corresponding data of the defect is compared. If or , it is determined that the depression defect affects the normal use of the logo, a depression warning signal is generated, and the depression warning signal is passed to the execution module.

[0019] K4: if the defect is a protrusion, a cleaning operation is performed first, then laser scanning is performed again, comparison of defect corresponding data is performed after scanning is completed, if or then it is determined that the recess defect affects the normal use of the logo, a protrusion warning signal is generated, the protrusion warning signal is transmitted to the execution module, is a preset defect quantity threshold value, is a preset defect volume threshold value;

[0020] K5: if and then laser scanning is performed on the position of the logo which is not marked as abnormal, then comparison of the total number and total volume of protrusions and recesses is performed again, if or or then it is determined that the recess defect affects the normal use of the logo, a protrusion warning signal is generated, the protrusion warning signal is transmitted to the execution module, is the total volume of the second detection of protrusions, is a preset second detection volume threshold value.

[0021] Preferably, the four sides of the cabinet body are hinged with transparent window doors, one side of the cabinet body is installed with a display screen through a fixed rod, and one end of the top surface of the cabinet body is installed with an alarm.

[0022] Preferably, the rotating mechanism includes a first motor at the lower end of the turntable, a first gear is installed on the output shaft of the first motor, a second gear is engaged in transmission on one side of the first gear, the second gear is fixedly connected with the rotating shaft of the turntable, and the material of the turntable is transparent high light transmission material.

[0023] Preferably, the grabbing mechanism includes a mounting table installed at one end of the mechanical arm and a second motor installed on one side of the mounting table, a first bidirectional screw rod is installed on the output end of the second motor through a shaft coupling, two clamping rods are threadedly connected on the first bidirectional screw rod, and a position sensor is installed on the bottom surface of the mounting table.

[0024] Preferably, the damage detection mechanism includes two laser scanners and two light sources, one of the laser scanners is located at the upper end of the light source, and the other laser scanner is located at the lower end of the light source.

[0025] Preferably, the positioning mechanism comprises a first positioning plate and a second positioning plate mounted on the rotary table, the top surface of the first positioning plate is fixedly connected with a limiting plate, one end of the first positioning plate is provided with a third motor, the output end of the third motor is provided with a one-way screw rod through a shaft coupling, the front end of the one-way screw rod is rotatably connected with the first positioning plate, the rear end of the one-way screw rod is threadedly connected with the second positioning plate, the other end of the first positioning plate is fixedly connected with two guide rods, the two guide rods are inserted into the second positioning plate, one side of the second positioning plate is provided with a fourth motor, the output end of the fourth motor is provided with a second bidirectional screw rod through a shaft coupling, two clamping plates are threadedly connected with the second bidirectional screw rod, the first positioning plate and the second positioning plate are made of transparent high light transmission material, an inverted trapezoidal guide groove is formed in the limiting plate, a guide angle is formed at the opening of the guide groove, and a limiting ring is mounted in the guide groove, and a plurality of pressure sensors are mounted on the limiting ring.

[0026] Preferably, the brightness detection mechanism comprises a mounting plate fixedly connected to the inner wall of the cabinet, a sliding groove is formed through the mounting plate, a mounting block is slidably mounted in the sliding groove, a power socket is formed in the mounting block, and a first electric push rod is mounted on the top surface of the mounting plate.

[0027] Preferably, the sorting mechanism comprises a pigment barrel mounted at the top end of the support rod, a pressure pump is mounted at one end of the pigment barrel, an atomizer is mounted at the other end of the pressure pump, the atomizer is located inside the top end of the support rod, a second electric push rod is mounted on one side of the top end of the support rod, a plastic spraying plate is mounted at the telescopic end of the second electric push rod, different number grooves are formed through the plastic spraying plate, and the plastic spraying plate is slidably mounted in the top end of the support rod.

[0028] Compared with the prior art, the present application has the following advantages:

[0029] 1. The cooperation of the industrial camera, the damage detection mechanism and the brightness detection mechanism facilitates comprehensive detection of the appearance, damage and brightness defects of the logo, improves the comprehensiveness and accuracy of the detection, and realizes the function of multi-dimensional defect detection; the cooperation of the sorting mechanism, the rotary table and the second conveying belt facilitates the classification marking and conveying of the logos with different detection results, improves the efficiency of sorting, and realizes the function of automatic sorting; the installation of the positioning mechanism facilitates the fixation of the plug in the limiting ring, and facilitates the insertion into the power socket for power supply; and finally solves the problems of poor detection accuracy, subsequent sorting trouble and difficulty in aligning the plug during brightness detection of the existing device.

[0030] 2. Through the analysis module, the processing of the gray block, the contour drawing and the abnormal marking, the possible defect area of the logo surface is accurately positioned, and the position information of the area is transmitted to the execution module. When the laser detection is controlled, the abnormal area is scanned preferentially, which avoids the omission or misjudgment caused by blind laser scanning, makes the laser detection more targeted, and improves the accuracy of defect detection;

[0031] 3. By performing cleaning operation before laser scanning, it can effectively distinguish whether the protrusion is caused by attachment or the protrusion of the logo itself material; if the protrusion disappears after cleaning, it is an attachment protrusion, which avoids misjudging it as a quality defect of the logo itself; if the protrusion still exists after cleaning, it can be determined as a logo material protrusion, which ensures the accuracy of the protrusion defect judgment and reduces unnecessary loss caused by misjudgment. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings described herein are used to provide further understanding of the present application, and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 The device overall three-dimensional structure schematic diagram proposed by the present application;

[0034] Figure 2 The device internal structure schematic diagram proposed by the present application;

[0035] Figure 3 The rotating mechanism structure schematic diagram proposed by the present application;

[0036] Figure 4 The grabbing mechanism structure schematic diagram proposed by the present application;

[0037] Figure 5 The broken detection mechanism structure schematic diagram proposed by the present application;

[0038] Figure 6 The positioning mechanism structure schematic diagram proposed by the present application;

[0039] Figure 7 The positioning mechanism cross-section structure schematic diagram proposed by the present application;

[0040] Figure 8 The brightness detection mechanism structure schematic diagram proposed by the present application;

[0041] Figure 9 The sorting mechanism structure schematic diagram proposed by the present application;

[0042] Figure 10 The sorting mechanism cross-section structure schematic diagram proposed by the present application;

[0043] Figure 11 A schematic diagram of the structure of the A site in the system proposed by the present application is shown in Figure 1. Figure 4 A schematic diagram of the structure of the A site in the system proposed by the present application is shown in Figure 1.

[0044] Figure 12 A schematic diagram of the structure of the A site in the system proposed by the present application is shown in Figure 1.

[0045] Figure 1: 1, cabinet; 2, first conveyor belt; 3, second conveyor belt; 4, mechanical arm; 5, industrial camera; 6, support rod; 7, transparent window door; 8, alarm; 9, display screen; 10, turntable; 11, first motor; 12, first gear; 13, second gear; 14, second motor; 15, first bidirectional screw; 16, clamping rod; 17, laser scanner; 18, light source; 19, first positioning plate; 20, second positioning plate; 21, limiting plate; 22, third motor; 23, unidirectional screw; 24, fourth motor; 25, second bidirectional screw; 26, clamping plate; 27, limiting ring; 28, pressure sensor; 29, mounting block; 30, power outlet; 31, first electric push rod; 32, pigment barrel; 33, pressure pump; 34, atomizer; 35, plastic spraying plate; 36, second electric push rod. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0047] Example 1: see Figures 1-11The application discloses a kind of appearance defect detection devices of automobile luminous badge, including cabinet 1, by cabinet 1, it is convenient to detect badge;Cabinet 1 side is equipped with inlet and outlet, inlet and outlet are respectively equipped with first conveyor belt 2 and second conveyor belt 3, by first conveyor belt 2 and second conveyor belt 3, it is convenient to cooperate with mechanical arm 4 feeding and discharging;First conveyor belt 2 and second conveyor belt 3 side are equipped with mechanical arm 4, and mechanical arm 4 other end is equipped with grabbing mechanism, and mechanical arm 4 is located in the inside of cabinet 1, and the inside of cabinet 1 is equipped with carousel 10, by carousel 10, it is convenient to detect piece respectively reaches different detection links;Carousel 10 lower end is equipped with rotating mechanism, and carousel 10 top surface is equipped with multiple positioning mechanisms equidistantly, and carousel 10 side is sequentially equipped with industrial camera 5, breakage detection mechanism, brightness detection mechanism and strut 6, and sorting mechanism is installed on strut 6, and the four sides of cabinet 1 are hingedly equipped with transparent window door 7, by transparent window door 7, it is convenient to observe the inside of cabinet 1;Cabinet 1 side is equipped with display screen 9 by fixed rod, by display screen 9, it is convenient to show detection data;And cabinet 1 top surface one end is equipped with alarm 8, by alarm 8, it is convenient to warn failure;Rotating mechanism includes first motor 11 located in the lower end of carousel 10, by first motor 11, it is convenient to drive first gear 12 rotation;First motor 11 output shaft is equipped with first gear 12, by first gear 12, it is convenient to cooperate with second gear 13 and drive carousel 10 rotation;First gear 12 side is meshed with second gear 13, and second gear 13 is fixedly connected with carousel 10 rotation shaft, and the material of carousel 10 is transparent high light transmission material, and grabbing mechanism includes mounting table installed in one end of mechanical arm 4 and second motor 14 installed in one side of mounting table, by second motor 14, it is convenient to drive first bidirectional screw rod 15 rotation;Second motor 14 output end is equipped with first bidirectional screw rod 15 by shaft coupling, by first bidirectional screw rod 15, it is convenient to drive clamping rod 16 to move inboard;Two clamping rods 16 are threadedly connected on first bidirectional screw rod 15, by clamping rod 16, it is convenient to clamp detection piece;And the bottom surface of mounting table is equipped with position sensor, by position sensor, it is convenient to accurately position clamping position;Breakage detection mechanism includes two laser scanners 17 and two light sources 18, by light source 18 cooperation detection piece light transmission makes breakage more obvious;One of laser scanners 17 is located in the upper end of light source 18, and the other laser scanner 17 is located in the lower end of light source 18, positioning mechanism includes first positioning plate 19 and second positioning plate 20 installed on carousel 10, by first positioning plate 19 and second positioning plate 20, it is convenient to install third motor 22 and fourth motor 24 respectively;The top surface of first positioning plate 19 is fixedly connected with limit plate 21, by limit plate 21, it is convenient to install limit ring 27;First positioning plate 19 one end is equipped with third motor 22, by third motor 22, it is convenient to drive unidirectional screw rod 23 rotation;Third motor 22 output end is equipped with unidirectional screw rod 23 by shaft coupling, by unidirectional screw rod 23, it is convenient to drive second positioning plate 20 movement;Unidirectional screw rod 23 front end is rotatably connected with first positioning plate 19.

[0048] In the application, the rear end of the one-way screw rod 23 is threadedly connected with the second positioning plate 20, the other end of the first positioning plate 19 is fixedly connected with two guide rods, both of which are inserted into the second positioning plate 20, a fourth motor 24 is installed on one side of the second positioning plate 20, and the fourth motor 24 is used to drive the second bidirectional screw rod 25 to rotate; the second bidirectional screw rod 25 is installed on the output end of the fourth motor 24 through a shaft coupling, and the second bidirectional screw rod 25 is used to drive the two clamping plates 26 to move inward; the two clamping plates 26 are threadedly connected with the second bidirectional screw rod 25, and the clamping plates 26 are used to clamp and fix one end of the logo; the first positioning plate 19 and the second positioning plate 20 are both made of transparent high-transmittance material, the limiting plate 21 is provided with an inverted trapezoidal guide groove, a guide angle is formed at the opening of the guide groove, a limiting ring 27 is installed in the guide groove, a plurality of pressure sensors 28 are installed on the limiting ring 27, and the pressure sensors 28 are used to determine that the power end of the logo is located at the accurate position; the brightness detection mechanism comprises a mounting plate fixedly installed on the inner wall of the cabinet 1, a sliding groove is formed through the mounting plate, a mounting block 29 is slidingly installed in the sliding groove, a power socket 30 is formed in the mounting block 29, a first electric push rod 31 is installed on the top surface of the mounting plate, and the first electric push rod 31 is used to push the mounting block 29 to move; the extension end of the first electric push rod 31 is connected with the top end of the mounting block 29; the sorting mechanism comprises a pigment barrel 32 installed at the top end of the support rod 6, a pressure pump 33 is installed at one end of the pigment barrel 32, and the pressure pump 33 is used to cooperate with an atomizer 34 to spray paint; the pressure pump 33 is installed at the other end of the atomizer 34, the atomizer 34 is located in the top end of the support rod 6, a second electric push rod 36 is installed on one side of the top end of the support rod 6, and the second electric push rod 36 is used to change the shape of the paint spraying; a plastic spraying plate 35 is installed at the extension end of the second electric push rod 36, different digital grooves are formed through the plastic spraying plate 35, and the plastic spraying plate 35 is slidingly installed in the top end of the support rod 6.

[0049] Embodiment 2: see Figure 12 , the cabinet 1 is provided with a smart control assembly, and the smart control assembly comprises a collection module, an analysis module and an execution module;

[0050] The collection module acquires image data collected by the industrial camera 5 and distance data collected by the laser scanner 17, and transmits the acquired data to the analysis module;

[0051] The analysis module receives the acquired data, analyzes the image data, filters out abnormal grayscale blocks to obtain the analysis image, compares the grayscale values ​​in the analysis image, draws the outline of the logo, and analyzes the abnormalities within the logo outline. If it is dirt, a cleaning signal is generated and transmitted to the execution module; if it is a dent defect, a dent warning signal is generated and transmitted to the execution module; if it is a protrusion defect, it is cleaned and then inspected again. If it is still determined to be abnormal, a protrusion warning signal is generated and transmitted to the execution module.

[0052] The image data acquired by industrial camera 5 are arranged in chronological order of acquisition time, with images acquired at the same time being... The image data is processed into grayscale and divided into several grayscale blocks of the same size according to the size of the pixel blocks. The grayscale blocks are then numbered according to their row and column numbers. The grayscale value data of each grayscale block is acquired and calculated. The average gray value of the corresponding numbered gray block in each image data. and standard deviation The calculated mean and standard deviation Detect the fluctuation range of grayscale data The setting marks detected grayscale values ​​outside the fluctuation range as abnormal grayscale values, and tracks the number of detected abnormal grayscale values. If statistics are performed, If an anomaly is detected in the image at the corresponding time, the acquisition time is marked as an abnormal time. The preset scaling factor is used; after removing abnormal grayscale values, the average of the remaining grayscale values ​​is calculated. The calculation, using the calculated mean This serves as the grayscale value data corresponding to the grayscale block;

[0053] In practical applications, The value is typically set between 0.3 and 0.5, but the specific value needs to be calibrated based on the logo type and the testing environment. For example, for smooth metal logos, there are fewer localized abnormal grayscale values ​​caused by reflection. It can be set to 0.3; however, for plastic logos, the surface is prone to dust accumulation, and the proportion of abnormal grayscale may be higher. It can be improved to 0.4-0.5; the setting is based on a large sample statistical analysis: by analyzing the image data of thousands of qualified logos, it was found that under normal circumstances, the proportion of abnormal grayscale is rarely more than 30%, therefore " The judgment criteria can effectively filter out a small number of anomalies caused by accidental noise (such as camera sensor error, low ambient light interference); if Too low (such as 0.2), may be misjudged as normal image containing slight noise for abnormal; if the value is too high (such as 0.6), a large number of abnormal gray caused by serious dirt or defects may be missed, affecting the accuracy of subsequent detection. In addition, Need to be linked with the number of image acquisition Linkage adjustment, when Increase (such as from 5 to 10), can appropriately reduce To balance the detection efficiency, avoid triggering the overall judgment due to accidental abnormality of single image;

[0054] In the image data collected at the corresponding time Select the image with the least abnormal gray in the image data as the analysis image, compare the corresponding numbered gray block gray value in the analysis image with the preset badge gray value fluctuation range, if the corresponding numbered gray block gray value is in the preset badge gray value fluctuation range, it is determined that the corresponding gray block is the badge gray block; compare the gray value With the gray value Of adjacent gray block, if Then determine that the corresponding badge gray block is the badge boundary gray block, and the gray difference between the badge boundary gray block and the adjacent gray block is the badge contour line, Is a preset difference threshold; connect the badge contour line, and compare the drawn contour line with the badge contour, if the two are proportional, it is determined that the contour is accurate;

[0055] The preset badge gray value fluctuation range is determined through strict sample statistics and calibration; collect image data of at least 500 qualified badges, analyze the gray value distribution, and take the gray mean value ± 3 times the standard deviation of all samples as the basic range; for example, the gray mean value of a certain type of chrome plated badge is 180, and the standard deviation is 20, then the fluctuation range is set to 120-240;

[0056] The range needs to be dynamically adjusted for different materials: metal badges have high gray range (such as 150-255) due to strong reflection; matte plastic badges have low gray (such as 80-180); badges with patterns need to be set in different regions (such as 60-100 for red pattern area and 150-220 for silver frame area); in addition, environmental light changes will affect the gray value, so the system needs to have adaptive calibration function: update the fluctuation range once every 100 badges to avoid judgment deviation caused by light source decay; for new type of badge, 100 samples need to be collected through "learning mode" to recalculate the range to ensure covering its gray characteristics;

[0057] The preset difference threshold For distinguishing the logo boundary and non-boundary area, its value needs to match the gray characteristics of the logo and background; for example, the gray difference at the boundary of a metal logo in a white background can reach 60-80, so It can be set to 40; while the gray difference of a black plastic logo in a dark background is smaller (about 30-40), It needs to be reduced to 25-30; the core role of this threshold is to capture the "gray level mutation": the gray value of the logo boundary will change dramatically due to material or color differences, while the gray change of internal defects (such as scratches) is relatively gentle (usually less than 20); by setting The maximum gray difference greater than the internal defect, it can avoid misjudging the internal defect as the boundary. For example, the maximum gray difference of a surface scratch of a certain vehicle logo is 15, so Setting it to 20 can effectively distinguish it; in addition, It needs to adapt to the image resolution: the gray change in high-resolution images is more delicate, It can be appropriately reduced (such as from 40 to 30) to ensure the accuracy of boundary recognition; low-resolution images need to be increased To reduce misjudgment;

[0058] Mark the gray block number of the contour line internal gray value anomaly, randomly select a marked gray block, and calculate the distance data between the marked gray block and the nearest contour line , and pass the distance data And the number of the nearest contour line to the execution module, Corresponding to the number of the marked gray block;

[0059] When the execution module controls the laser detection, it preferentially scans the logo surface at the corresponding position according to the distance data And the number of the nearest contour line passed, and passes the distance data Scanned feedback to the analysis module; the analysis module compares the distance data Feedback with the distance data At the corresponding position of the standard part, if , it is determined that there is an anomaly at the detection position, The preset difference threshold; if , it is determined that the gray anomaly at the detection position is caused by dirt, a cleaning signal is generated, and the cleaning signal is passed to the execution module;

[0060] The value needs to be combined with the accuracy of the laser scanner and the critical size of the logo defect; the typical accuracy of the laser scanner is ±0.05mm, so It needs to be greater than twice the accuracy value (0.1mm) to filter equipment errors; for different defect types, Need to be differentiated: the depth of the scratch is usually small (0.05-0.2mm), Set to 0.1mm; the depth of the concave defect is larger (0.2mm or more), Can be set to 0.2mm; the setting is based on industry standards: the allowable depth of the surface defect of the automobile logo is usually 0.15mm, so Set to 0.15mm can directly relate to the grid judgment; for example, when the difference between the scanning distance and the standard value exceeds 0.15mm, it is judged as an out-of-standard defect; in addition, Need to adapt to the logo part: the slight deviation of the edge area (such as 0.2mm) may not affect the appearance, Can be relaxed to 0.25mm; the center pattern area requires strict, Keep 0.15mm; the system also needs to have a temperature compensation function, because the metal logo will expand and contract due to temperature (about 0.03mm / ℃), which needs to be adjusted according to the real-time temperature , to avoid misjudgment caused by environmental factors;

[0061] The execution module controls the mechanical arm provided for cleaning in the detection device after receiving the cleaning signal, and cleans the logo according to the corresponding position of the anomaly on the logo;

[0062] If , it is judged that there is a concave defect at the abnormal detection position; otherwise, it is judged that there is a convex defect; when laser scanning the gray block with abnormal gray value inside the contour line, the laser moves in the range corresponding to the gray block until Stop moving, and record the distance data detected during the movement; divide the area of the defect position into several laser-sized columns, record the number of columns corresponding to the defect , calculate the defect volume data of the defect position according to the recorded distance data ;

[0063] Calculate the total number of columns corresponding to the defect on the logo and the total defect volume data (total number of convex and concave); if the defect is a concave defect, compare the corresponding data of the defect; if or , it is judged that the concave defect affects the normal use of the logo, and a concave warning signal is generated, which is transmitted to the execution module;

[0064] is based on the counting standard of "columnar units" of defects, where "laser-sized columns" refer to cylindrical bodies with a diameter equal to the laser spot (usually 0.5mm), and each column corresponds to a scanning point of the laser; The design needs to consider both the logo size and the visibility of defects: small logos (e.g., 50mm in diameter) have a small surface area. The limit is set to 3 (meaning the total defect coverage area does not exceed 3 × 0.5² × π ≈ 2.35 mm²); for large logos (e.g., 100 mm in diameter), this can be relaxed to 5-6. The setting logic is based on the characteristics of human vision: research shows that when the total defect area exceeds 0.5% of the logo's surface area, it is clearly perceptible to the naked eye. The requirement is that "the total area of ​​the columns ≤ 0.5% × the logo area". For example, if the logo area is 1000mm², 0.5% is 5mm². 5 ÷ (0.5² × π) ≈ 6; Furthermore, defect distribution also affects... Defects that are concentrated (such as three columns in one place) are more noticeable than defects that are scattered (such as one in each of three places). Therefore, the system needs to give extra weight to concentrated defects (such as two concentrated defects are equivalent to three scattered defects) to ensure that the judgment is consistent with visual perception.

[0065] (Initial test) and The difference in (secondary inspection) reflects the flexibility of the inspection strategy; the volume is calculated as "single column volume × number", where the single column volume = π × (0.25 mm)² × defect depth (determined by the difference in laser scanning distance). Slightly larger (e.g., 0.12mm³), since the secondary inspection targets unmarked areas, which are mostly minor defects, a slight relaxation can reduce unnecessary rework; for critical areas, The volumetric threshold must be strictly controlled to 0.05 mm³, but can be relaxed to 0.15 mm³ in non-critical areas. Furthermore, different defect types have different volumetric weights: raised defects, due to their susceptibility to wear, have a 20% lower volumetric threshold than recessed defects (e.g., raised defects). 0.08, depression 0.1), ensuring key control over high-risk defects;

[0066] After receiving the dent warning signal, the execution module controls the buzzer module in the intelligent control component to emit a buzzer warning and displays "Dent Warning" on the display screen 9, showing the number of dents, the location of the corresponding dents, and the volume of the corresponding dents, so that the staff can accurately carry out manual inspection again.

[0067] If the defect is a protrusion, perform a cleaning operation first, then perform a laser scan again, and finally compare the data corresponding to the defect after the scan is completed; if or If the dented defect affects the normal use of the logo, a raised warning signal is generated and transmitted to the execution module. To preset a threshold for the number of defects, a preset defect volume threshold value;

[0068] After receiving the protrusion warning signal, the execution module controls the buzzer module in the intelligent control assembly to issue a buzzer warning, displays "protrusion warning" on the display screen 9, and displays the number of protrusions, the positions corresponding to the protrusions, and the volumes corresponding to the protrusions, so as to facilitate the staff to accurately perform manual investigation again;

[0069] If and , then laser scanning is performed on the positions on the logo which are not marked as abnormal, and then the total number and total volume of the protrusions and the depressions are compared again. If or or , it is determined that the depression defect affects the normal use of the logo, a protrusion warning signal is generated, and the protrusion warning signal is transmitted to the execution module, the total volume of the protrusions is detected again, a preset second detection volume threshold value.

[0070] Working principle: when the present application is used, the automobile light-emitting badge to be detected is conveyed to the entrance of the cabinet 1 by the first conveying belt 2, the mechanical arm 4 drives the grabbing mechanism to move above the badge, the position sensor in the grabbing mechanism assists positioning, ensuring accurate identification of the badge position, the second motor 14 is started, driving the first bidirectional screw rod 15 to rotate, so that the two clamping rods 16 approach each other, clamping the badge, the mechanical arm 4 transfers the clamped badge to the positioning mechanism of the turntable 10, in the positioning mechanism, the third motor 22 drives the unidirectional screw rod 23 to rotate, driving the second positioning plate 20 to move along the guide rod, adjusting the distance from the first positioning plate 19, pulling the badge power cord, at this time the socket at one end of the power cord is in contact with the limiting ring 27 under the action of the guide groove, at this time the pressure sensor 28 senses the signal, the third motor 22 stops, the fourth motor 24 drives the second bidirectional screw rod 25 to rotate, so that the two clamping plates 26 clamp the badge, in the rotating mechanism, the first motor 11 is started, driving the first gear 12 to rotate, through the meshing transmission with the second gear 13, the turntable 10 is rotated, the turntable 10 sequentially conveys the positioned badge to the industrial camera 5, the damage detection mechanism, the brightness detection mechanism and the sorting mechanism, the industrial camera 5 collects images of the badge appearance, preliminarily detects surface defects, the two laser scanners 17 scan the badge from above and below under the cooperation of the light source 18, detecting surface damage, scratches and other physical defects, the first electric push rod 31 pushes the mounting block 29 to move along the sliding groove, so that the power socket 30 is connected with the badge for power supply, the industrial camera 5 shoots the brightness data in the light-emitting state, detecting optical defects such as brightness unevenness and abnormal light-emitting area, after the detection is completed, the turntable 10 sends the badge to the sorting mechanism, the pressure pump 33 pressurizes the pigment in the pigment barrel 32, atomizes through the atomizer 34, the second electric push rod 36 pushes the plastic spraying plate 35 to slide, so that the corresponding digital slot is aligned with the atomizer 34, the digital is sprayed on the badge, marking different detection results, the mechanical arm 4 grabs the marked badge to the second conveying belt 3, and sends it out of the cabinet 1, the display screen 9 displays the detection process and results in real time, facilitating the operator to monitor, if serious defects or equipment failure are detected, the alarm 8 issues an alarm, reminding timely processing.

[0071] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A kind of automobile luminous logo appearance defect detection device, including cabinet (1), it is characterized in that: The cabinet (1) is provided with an entrance and an exit on one side, the entrance and the exit are respectively provided with a first conveying belt (2) and a second conveying belt (3), the first conveying belt (2) and the second conveying belt (3) are provided with a mechanical arm (4) on one side, the mechanical arm (4) is provided with a grabbing mechanism on the other end, the mechanical arm (4) is located in the cabinet (1), and the cabinet (1) is provided with a rotating disc (10) inside, the rotating disc (10) is provided with a rotating mechanism on the lower end, a plurality of positioning mechanisms are equidistantly arranged on the top surface of the rotating disc (10), and an industrial camera (5), a damage detection mechanism, a brightness detection mechanism and a supporting rod (6) are sequentially arranged on the side of the rotating disc (10). The cabinet (1) is provided with a smart control assembly, and the smart control assembly comprises an analysis module. The analysis module receives the collected data, analyzes the image data, filters the analysis image according to the abnormal gray blocks, compares the gray values in the analysis image, draws the contour of the logo, analyzes the abnormalities in the logo contour, generates a cleaning signal if it is dirt, generates a concave warning signal if it is a concave defect, and generates a convex warning signal if it is a convex defect after cleaning and re-detection. The analysis module analyzes the laser scanning distance data as follows: K1: if , it is determined that an abnormality exists at the detection position, is a preset difference threshold value; if , it is determined that the abnormality at the detection position is caused by dirt, a cleaning signal is generated, and the cleaning signal is transmitted to an execution module, is distance data fed back by scanning, is distance data at a corresponding position of a standard part; K2: if then determine that a depression is present at the abnormality detection position; Conversely, it is determined that there is a protrusion; when laser scanning the gray block with abnormal gray value inside the contour line, the laser moves in the range corresponding to the gray block until the movement is stopped, and the distance data detected during the movement is recorded; The area of the defect position is divided into several laser-sized columns, and the number of columns corresponding to the defect is recorded According to the recorded distance data The defect volume data of the defect position is calculated ; K3: total number of columnar defects corresponding to the defects on the logo and total defect volume data Calculate, if the defect is a depression, compare the defect corresponding data; if or , it is determined that the depression defect affects the normal use of the logo, a depression warning signal is generated, and the depression warning signal is transmitted to the execution module; K4: if the defect is a protrusion, first perform a cleaning operation, then perform laser scanning again, and after scanning, compare the defect corresponding data; if or , it is determined that the concave defect affects the normal use of the logo, a protrusion warning signal is generated, and the protrusion warning signal is transmitted to the execution module, is a preset defect quantity threshold, is a preset defect volume threshold; K5: if and , then laser scanning is performed on the position on the logo where no abnormality is marked, and then the raised and recessed total number and total volume comparison is performed again, if or or , then it is determined that the recessed defect affects the normal use of the logo, a raised warning signal is generated, and the raised warning signal is transmitted to the execution module, is the total volume of the raised second detection, is a preset second detection volume threshold.

2. A device for detecting appearance defects of an automotive lighted emblem according to claim 1, characterized in that: The analysis module analyzes the image data as follows: S1: Data collected at the same time The image data is processed into grayscale and divided into several grayscale blocks of the same size according to the size of the pixel blocks. The grayscale blocks are then numbered according to the row and column number of the divided image blocks. S2: obtaining the gray value data of each gray block, and calculating the average value of the gray value of the gray block corresponding to the number in the image data and the standard deviation , to obtain the average value and the standard deviation of the detected gray value data fluctuation range , mark the detected gray value data not in the fluctuation range as abnormal gray, and count the number of detected abnormal gray , if , it is determined that the image detected at the corresponding time exists abnormity, is a preset proportion coefficient; after removing the abnormal gray, the average value of the remaining gray value data is calculated, and the average value obtained is taken as the gray value data corresponding to the gray block; S3: Data collected at the corresponding time. The image with the fewest abnormal gray levels in the image data is selected as the analysis image. The gray value of the corresponding numbered gray block in the analysis image is compared with the preset logo gray value fluctuation range. If the gray value of the corresponding numbered gray block is within the preset logo gray value fluctuation range, the corresponding gray block is determined to be the logo gray block. S4: Convert the grayscale value of the logo grayscale block gray values ​​of adjacent gray blocks If a comparison is made, If the corresponding logo grayscale block is determined to be the logo boundary grayscale block, then the grayscale difference boundary line between the logo boundary grayscale block and adjacent grayscale blocks is the logo outline line. A preset difference threshold is set; the logo outline is connected, and the drawn outline is compared with the logo outline. If the two are proportional, the outline is determined to be accurate. S5: mark the number of the gray block with abnormal gray value inside the contour line, randomly select a marked gray block, and calculate the distance data between the marked gray block and the nearest contour line , and pass the distance data and the number of the nearest contour line to the execution module, for the number of the corresponding marked gray block.

3. A device for detecting appearance defects of an automotive lighted emblem as recited in claim 1, wherein: The cabinet (1) is provided with a transparent window door (7) on four sides, a display screen (9) is arranged on one side of the cabinet (1) through a fixing rod, and an alarm (8) is arranged at one end of the top surface of the cabinet (1).

4. A device for detecting appearance defects of an automotive emblem according to claim 1, characterized in that: The rotating mechanism comprises a first motor (11) located at the lower end of the rotating disc (10), a first gear (12) is arranged on the output shaft of the first motor (11), a second gear (13) is arranged on one side of the first gear (12) and is in transmission connection with the first gear (12), the second gear (13) is fixedly connected with the rotating shaft of the rotating disc (10), and the material of the rotating disc (10) is transparent and high-transmittance.

5. A device for detecting appearance defects of an automotive emblem according to claim 1, characterized in that: The grabbing mechanism comprises a mounting table arranged on one end of the mechanical arm (4) and a second motor (14) arranged on one side of the mounting table, a first bidirectional screw rod (15) is arranged on the output end of the second motor (14) through a shaft coupling, two clamping rods (16) are threadedly connected on the first bidirectional screw rod (15), and a position sensor is arranged on the bottom surface of the mounting table.

6. A device for detecting appearance defects of an automotive emblem according to claim 1, characterized in that: The damage detection mechanism comprises two laser scanners (17) and two light sources (18), one of the laser scanners (17) is located on the upper end of the light source (18), and the other laser scanner (17) is located on the lower end of the light source (18).

7. A device for detecting appearance defects of an automotive emblem according to claim 1, characterized in that: The positioning mechanism comprises a first positioning plate (19) and a second positioning plate (20) mounted on the rotating disc (10), the top surface of the first positioning plate (19) is fixedly connected with a limiting plate (21), one end of the first positioning plate (19) is provided with a third motor (22), the output end of the third motor (22) is provided with a one-way screw rod (23) through a shaft coupling, the front end of the one-way screw rod (23) is rotatably connected with the first positioning plate (19), the rear end of the one-way screw rod (23) is threadedly connected with the second positioning plate (20), and the other end of the first positioning plate (19) is fixedly connected with two guide rods, both of which are inserted into the second positioning plate (20), one side of the second positioning plate (20) is provided with a fourth motor (24), the output end of the fourth motor (24) is provided with a second bidirectional screw rod (25) through a shaft coupling, two clamping plates (26) are threadedly connected on the second bidirectional screw rod (25), the first positioning plate (19) and the second positioning plate (20) are made of transparent high-transmittance material, an inverted trapezoidal guide groove is formed in the limiting plate (21), a guide angle is formed at the groove opening of the guide groove, a limiting ring (27) is mounted in the guide groove, and a plurality of pressure sensors (28) are mounted on the limiting ring (27).

8. A device for detecting appearance defects of an automotive emblem according to claim 1, characterized in that: The brightness detection mechanism comprises a mounting plate fixedly connected to the inner wall of the cabinet (1), a sliding groove is formed in the mounting plate, a mounting block (29) is slidably mounted in the sliding groove, a power socket (30) is formed in the mounting block (29), a first electric push rod (31) is mounted on the top surface of the mounting plate, and the telescopic end of the first electric push rod (31) is connected with the top end of the mounting block (29).

9. A device for detecting appearance defects of an automotive emblem according to claim 1, characterized in that: The sorting mechanism comprises a pigment barrel (32) mounted at the top end of the supporting rod (6), the pigment barrel (32) is provided with a pressurizing pump (33) at one end, the pressurizing pump (33) is provided with an atomizer (34) at the other end, the atomizer (34) is located in the inside of the top end of the supporting rod (6), a second electric push rod (36) is mounted at one side of the top end of the supporting rod (6), a plastic spraying plate (35) is mounted at the telescopic end of the second electric push rod (36), different digital grooves are formed in the plastic spraying plate (35), and the plastic spraying plate (35) is slidably mounted in the inside of the top end of the supporting rod (6).

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