Welding wheel surface defect detection system

Abstract

The utility model discloses a welding wheel surface defect detection system which comprises a first camera, a second camera, a first light source, a second light source, a data transmission device, a welding wheel control device, a relay and a server. After the upper welding wheel and the lower welding wheel are ground, the welding wheel control device sends a pull-in signal to the relay; the relay is actuated when receiving the actuation signal so as to conduct the welding wheel control device and the data transmission device; under the condition that the data transmission device is conducted with the welding wheel control device, frame synchronizing signals are sent to the first camera and the second camera, and starting signals are sent to the first light source and the second light source; the first camera performs image acquisition on the surface of the upper welding wheel under the action of the frame synchronizing signal and the first light source to obtain an upper welding wheel image; the second camera performs image acquisition on the surface of the lower welding wheel under the action of the frame synchronizing signal and the second light source to obtain a lower welding wheel image; and the server performs defect detection according to the upper welding wheel image and the lower welding wheel image, so that the detection accuracy is improved.

Description

Technical Field

[0001] This application belongs to the field of surface inspection technology, and in particular relates to a surface defect detection system for welding wheels. Background Technology

[0002] The welding machine at the entrance of a cold rolling continuous annealing production line typically uses a narrow lap welding machine to complete strip steel welding, enabling continuous production. During strip steel welding, surface defects on the welding wheel can lead to difficulties in controlling weld quality, resulting in a high re-welding rate and increasing the risk of weld misalignment. Once the weld is misaligned, re-welding inevitably causes the process section to slow down and stop, severely affecting the continuous production rhythm.

[0003] Currently, defect detection on the surface of welding wheels is mainly carried out manually. Specifically, after each welding operation at the entrance of the cold rolling continuous annealing production line, the welding wheel is lifted, wiped and observed by maintenance personnel. Once the surface of the welding wheel is determined to be free of defects, it is put back into use for the next welding cycle. During maintenance, the welding wheel is disassembled, inspected, and replaced periodically by maintenance personnel.

[0004] During manual inspection, maintenance personnel observe the surface of the welding wheel from a vertical position along the axis. The observation angle is not ideal, and the lighting is poor, making it difficult to clearly see the defects on the surface of the welding wheel. This can easily lead to oversights and poor accuracy in detecting defects on the surface of the welding wheel. Utility Model Content

[0005] The embodiments of this application provide a welding wheel surface defect detection system, which can at least improve the accuracy of welding wheel surface defect detection to a certain extent.

[0006] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0007] According to a first aspect of the embodiments of this application, a welding wheel surface defect detection system is provided, comprising: a first camera, a second camera, a first light source, a second light source, a data transmission device, a welding wheel control device, a relay, and a server; wherein,

[0008] The welding wheel control device is connected to the upper welding wheel, the lower welding wheel and the relay respectively; the data transmission device is connected to the first camera, the second camera, the first light source, the second light source and the relay respectively; and the server is connected to the first camera and the second camera respectively.

[0009] The welding wheel control device is used to send an engagement signal to the relay after the upper welding wheel and the lower welding wheel have been ground.

[0010] The relay is used to activate upon receiving the activation signal to connect the welding wheel control device and the data transmission device.

[0011] The data transmission device is used to send frame synchronization signals to the first camera and the second camera, and to send activation signals to the first light source and the second light source, respectively, when connected to the welding wheel control device;

[0012] The first camera is used to acquire an image of the surface of the upper welding wheel under the action of the frame synchronization signal and the first light source, obtain an image of the upper welding wheel, and send the image of the upper welding wheel to the server.

[0013] The second camera is used to acquire an image of the surface of the lower welding wheel under the action of the frame synchronization signal and the second light source, obtain an image of the lower welding wheel, and send the image of the lower welding wheel to the server;

[0014] The server is used to perform defect detection based on the upper welding wheel image and the lower welding wheel image.

[0015] In some embodiments, the surface of the upper welding wheel is provided with an upper welding wheel surface detection point, the surface of the lower welding wheel is provided with a lower welding wheel surface detection point, the first camera and the first light source are respectively located on both sides of the normal of the upper welding wheel surface detection point, and the second camera and the second light source are respectively located on both sides of the normal of the lower welding wheel surface detection point.

[0016] In some embodiments, the angle between the straight line from the first camera to the detection point on the surface of the upper welding wheel and the normal to the detection point on the surface of the upper welding wheel is 25 degrees, and the angle between the straight line from the first light source to the detection point on the surface of the upper welding wheel and the normal to the detection point on the surface of the upper welding wheel is 22 degrees or 26 degrees.

[0017] In some embodiments, the angle between the straight line from the second camera to the detection point on the surface of the lower welding wheel and the normal to the detection point on the surface of the lower welding wheel is 25 degrees, and the angle between the straight line from the second light source to the detection point on the surface of the lower welding wheel and the normal to the detection point on the surface of the lower welding wheel is 22 degrees or 26 degrees.

[0018] In some embodiments, both the first light source and the second light source are LED blue light sources.

[0019] In some embodiments, the scanning speed of both the first camera and the second camera is greater than the operating speed of the upper welding wheel or the lower welding wheel.

[0020] In some embodiments, the maximum scanning line frequency of both the first camera and the second camera is 18,000 lines per second.

[0021] In some embodiments, the data transmission device includes an input / output control board and a frame synchronization board; wherein,

[0022] The input / output control board is connected to the input terminal of the frame synchronization board and the relay, respectively.

[0023] The output of the frame synchronization board is connected to the first camera and the second camera, respectively.

[0024] In some embodiments, the data transmission device further includes a light source control board, the input terminal of which is connected to the input / output control board, and the output terminal of which is connected to the first light source and the second light source, respectively.

[0025] In some embodiments, the data transmission device further includes a switch, which is connected to the input / output control board and the server, respectively.

[0026] In this application, a first camera, a second camera, a first light source, a second light source, a data transmission device, a welding wheel control device, a relay, and a server are configured. The welding wheel control device is connected to the upper welding wheel, the lower welding wheel, and the relay. The data transmission device is connected to the first camera, the second camera, the first light source, the second light source, and the relay. The relay is also connected to the first camera and the second camera. The welding wheel control device sends a closing signal to the relay after the upper and lower welding wheels have been ground. The relay closes upon receiving the closing signal to connect the welding wheel control device to the data transmission device. The data transmission device, when connected to the welding wheel control device, sends frame synchronization signals to the first camera and the second camera, and activation signals to the first light source and the second light source, respectively. The first camera, under the influence of the frame synchronization signal and the first light source, acquires an image of the surface of the upper welding wheel, obtains an image of the upper welding wheel, and sends the image of the upper welding wheel to the server. The second camera, under the influence of the frame synchronization signal and the second light source, acquires an image of the surface of the lower welding wheel, obtains an image of the lower welding wheel, and sends the image of the lower welding wheel to the server. The server performs defect detection based on the images of the upper and lower welding wheels. This scheme obtains a clear image of the welding wheel surface, and performing defect detection based on this image avoids oversights and improves detection accuracy.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0029] Figure 1 A schematic diagram of the structure of a welding wheel surface defect detection system according to some embodiments of this application is shown;

[0030] Figure 2 It shows Figure 1 A schematic diagram showing the installation positions of the first camera, the second camera, the first light source, and the second light source.

[0031] Figure 3 It shows Figure 1 A schematic diagram of the mechanical assembly of the first camera, second camera, first light source, and second light source;

[0032] Figure 4 It shows Figure 1 A schematic diagram showing the installation angle of the central camera and its corresponding light source;

[0033] Figure 5 A schematic diagram showing the recognition rate of different defects on the welding wheel surface corresponding to cameras at different installation angles is presented.

[0034] Figure 6 A schematic diagram of the structure of a welding wheel surface defect detection system according to other embodiments of this application is shown.

[0035] Explanation of icon numbers:

[0036] First camera - 100; Second camera - 200; First light source - 300; Second light source - 400; Data transmission device - 500; Welding wheel control device - 600; Relay - 700; Server - 800; Input / output control board - 510; Frame synchronization board - 520; Light source control board - 530; Switch - 540. Detailed Implementation

[0037] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0041] Figure 1 A schematic diagram of the structure of a welding wheel surface defect detection system according to some embodiments of this application is shown. For example... Figure 1As shown, in some embodiments, the welding wheel surface defect detection system may include: a first camera 100, a second camera 200, a first light source 300, a second light source 400, a data transmission device 500, a welding wheel control device 600, a relay 700, and a server 800; wherein, the welding wheel control device 600 is connected to the upper welding wheel (not shown), the lower welding wheel (not shown), and the relay 700 respectively; the data transmission device 500 is connected to the first camera 100, the second camera 200, the first light source 300, the second light source 400, and the relay 700 respectively; and the server 800 is connected to the first camera 100 and the second camera 200 respectively; the welding wheel control device 600 is used to send an engagement signal to the relay 700 after the upper and lower welding wheels have been ground; the relay 700 is used to receive an engagement signal upon receiving the engagement signal. When the engagement signal is received, the welding wheel control device 600 and the data transmission device 500 are connected. The data transmission device 500, when connected to the welding wheel control device 600, sends frame synchronization signals to the first camera 100 and the second camera 200, and sends activation signals to the first light source 300 and the second light source 400, respectively. The first camera 100, under the action of the frame synchronization signal and the first light source 300, acquires an image of the upper welding wheel and sends the image of the upper welding wheel to the server 800. The second camera 200, under the action of the frame synchronization signal and the second light source 400, acquires an image of the lower welding wheel and sends the image of the lower welding wheel to the server 800. The server 800 performs defect detection based on the upper and lower welding wheel images.

[0042] It should be noted that the operation of the welding wheel includes a series of steps such as welding, wheel grinding, post-grinding compaction, elevation adjustment, and rotation. During welding, the welding wheel undergoes a pressing action and rotates at high speed. After welding, it is lifted and returned to its original position for manual grinding. Due to the complex working conditions of the welding wheel itself, it is necessary to select an appropriate time to acquire images of the welding wheel surface and perform defect detection. In this embodiment, the timing is set after the welding wheel grinding is completed. After the welding wheel grinding is completed, the welding wheel control device 600 can control the upper and lower welding wheels to rotate at low speed and simultaneously send a energizing signal to the relay 700, causing the relay 700 to energize. This, in turn, activates the first camera 100, the first light source 300, the second camera 200, the second light source 400, the data transmission device 500, and the server 800 to complete the defect detection.

[0043] In some embodiments, both the first camera 100 and the second camera 200 are CCD cameras. Employing the CCD imaging principle, they illuminate the surface of a rotating welding wheel with light emitted from a light source. The cameras continuously capture the light reflected from the welding wheel surface and convert the intensity changes of the reflected light into a grayscale image. Because defective areas (such as weld slag, pits, foreign objects, and scratches) on the welding wheel surface differ from defect-free areas in their light reflection properties, their light absorption also differs. The intensity of the reflected light is reflected in the grayscale image captured by the camera; the greater the light intensity, the higher the grayscale value of the image, and vice versa. Therefore, by processing and analyzing the grayscale images captured by the cameras, the server 800 can detect the presence of defects on the welding wheel surface and determine the nature of the defects.

[0044] Server 800 can store server processes, primarily used for image storage, defect database storage, defect category editing, periodic defect detection settings, and alarm information display. Through these server processes, information such as defect type, severity level, location, and size can be recorded. Defects are categorized and automatically alerted, enabling real-time data display and historical data querying. Overall analysis of welding wheel data is performed, and a self-learning defect model library is built using deep learning algorithms. Through continuous training, the defect recognition rate is gradually improved, and users can conveniently use archived data to guide and optimize welding wheel replacement and maintenance cycles.

[0045] Figure 2 It shows Figure 1 A schematic diagram showing the installation positions of the first camera 100, the second camera 200, the first light source 300, and the second light source 400. (See diagram below.) Figure 2 As shown, in some embodiments, the surface of the upper welding wheel is provided with an upper welding wheel surface detection point (pointed to by the arrow of the first camera), and the surface of the lower welding wheel is provided with a lower welding wheel surface detection point (pointed to by the arrow of the second camera). The first camera 100 and the first light source 300 are respectively located on both sides of the normal of the upper welding wheel surface detection point, and the second camera 200 and the second light source 400 are respectively located on both sides of the normal of the lower welding wheel surface detection point.

[0046] It is understandable that the poor lighting conditions in the welding wheel production line can lead to insufficient image clarity in the cameras, thus requiring supplemental lighting. In this embodiment, the first camera 100 uses the first light source 300 for supplemental lighting to capture images of the upper welding wheel surface; the second camera 200 uses the second light source 400 for supplemental lighting to capture images of the lower welding wheel surface.

[0047] Figure 3 It shows Figure 1 A schematic diagram of the mechanical assembly of the first camera 100, the second camera 200, the first light source 300, and the second light source 400. Figure 3As shown, the installation positions and structures of the light source and camera can be designed based on the rotation of the upper and lower welding wheels. The mechanical tooling design, including the camera column, camera adjustment plate, light source column, and light source bracket, can be completed, and the tooling can be manufactured according to the design requirements.

[0048] In some embodiments, the angle between the straight line from the first camera to the detection point on the surface of the upper welding wheel and the normal to the detection point on the surface of the upper welding wheel is 25 degrees, and the angle between the straight line from the first light source to the detection point on the surface of the upper welding wheel and the normal to the detection point on the surface of the upper welding wheel is 22 degrees or 26 degrees. The angle between the straight line from the second camera to the detection point on the surface of the lower welding wheel and the normal to the detection point on the surface of the lower welding wheel is 25 degrees, and the angle between the straight line from the second light source to the detection point on the surface of the lower welding wheel and the normal to the detection point on the surface of the lower welding wheel is 22 degrees or 26 degrees.

[0049] It should be noted that different camera and light source angles will result in very large grayscale differences. Choosing the right camera and light source angle is crucial for defect extraction, detection, and identification. Figure 4 It shows Figure 1 A schematic diagram showing the installation angles of the camera and its corresponding light source. (See diagram below.) Figure 4 As shown, the angle between the straight line from the camera to the detection point on the surface of the welding wheel and the normal to the detection point on the surface of the welding wheel is 25 degrees, and the angle between the straight line from the light source to the detection point on the surface of the welding wheel and the normal to the detection point on the surface of the welding wheel is 22 degrees.

[0050] Figure 5 This diagram illustrates the recognition rate of different defects on the welding wheel surface corresponding to cameras at different mounting angles. (For example...) Figure 5 As shown, the analysis of the recognition rate of different defects under two conditions, namely bright field and dark field, with camera angle (i.e., the angle between the straight line from the camera to the detection point on the surface of the welding wheel and the normal of the detection point on the surface of the welding wheel) of 20 degrees, 25 degrees and 27 degrees respectively, shows that the recognition rate is generally higher when the camera angle is 25 degrees.

[0051] In addition, statistical analysis of experimental data shows that when shooting under conditions where the light source angle (i.e., the angle between the straight line from the light source to the detection point on the welding wheel surface and the normal to the detection point on the welding wheel surface) is 22 degrees or 26 degrees and the camera angle is 25 degrees, the server's defect recognition rate is higher than that of other shooting angles, and the captured defect features are obvious with low detection error.

[0052] By designing tooling based on the welding machine production line environment, and calibrating and adjusting it to determine the optimal angle for the camera and light source, we can ensure that the images captured by the camera are clear and effective, thus improving recognition accuracy.

[0053] In some embodiments, the scanning speed of the first camera 100 and the second camera 200 is greater than the operating speed of the upper or lower welding wheel.

[0054] During implementation, the maximum scanning line frequency of both the first camera 100 and the second camera 200 is 18,000 lines per second.

[0055] Understandably, scanning line frequency refers to the number of lines a camera can scan per unit of time, with a maximum of 18,000 lines per second. A higher line frequency means the camera can capture high-resolution images faster, which is especially important for shooting dynamic scenes. A 4K camera with a maximum scanning line frequency of 18,000 lines per second can achieve a scanning speed of approximately 22.32 meters per second, while the speed of the welding wheel in defect detection is much lower, typically only 0.3 meters per second. Therefore, a camera with a maximum scanning line frequency of 18,000 lines per second fully meets the inspection requirements.

[0056] It should be noted that, considering the narrow outer surface of the welding wheel and the small size of the defects, the selected camera needs to meet the characteristics of high resolution, high sensitivity, and high scanning speed. In the implementation process, the effective pixel count of the camera can be 4096, the pixel bit width can be 8 / 10 bits, the pixel clock frequency can be 2*40MHz, and the imaging mode can be line scanning. In this way, a stable and uniform imaging effect can be formed in conjunction with the light source.

[0057] In some embodiments, both the first light source 300 and the second light source 400 are LED blue light sources.

[0058] Understandably, other equipment on the welding production line typically uses white light sources. Under the same conditions, the light intensity of blue light is superior to that of white light, being several thousand LUX (LUX is a unit of light intensity). Camera lenses are fitted with filters to block light with wavelengths outside the 600nm-800nm ​​range, while blue light has a wavelength range of 400nm-480nm. By selecting a blue LED light source, interference from other light sources on the production line can be avoided in the welding wheel surface defect detection system.

[0059] Figure 6 A schematic diagram of the structure of a welding wheel surface defect detection system according to other embodiments of this application is shown. For example... Figure 6 As shown, in some embodiments, the data transmission device 500 may include an input / output control board 510 and a frame synchronization board 520; wherein, the input / output control board 510 is connected to the input terminal of the frame synchronization board 520 and the relay 700 respectively; the output terminal of the frame synchronization board 520 is connected to the first camera 100 and the second camera 200 respectively.

[0060] During implementation, the input / output control board 510 can receive external control signals for detection and control, and can also output certain signals. The input / output control board 510 can be connected to a 24V power supply and has the capability of 12 inputs and 8 outputs.

[0061] The frame synchronization board 520 can perform functions such as filtering, frequency reduction, line triggering, frame triggering, signal distribution, self-trigger control, and output frequency statistics. It controls the shooting frequency of the first camera 100 and the second camera 200 to achieve "line synchronization" and "frame synchronization" shooting between the first camera 100 and the second camera 200. The frame synchronization board 520 can also be connected to a 24V power supply and has one encoder input interface, six signal output interfaces, one network interface, and one serial interface.

[0062] In some embodiments, the data transmission device 500 further includes a light source control board 530, the input terminal of which is connected to the input / output control board 510, and the output terminal of which is connected to the first light source 300 and the second light source 400 respectively.

[0063] The light intensity of the first light source 300 and the second light source 400 can be adjusted by the light source control board 530, as well as the light source can be turned on and off, which greatly increases the lifespan of the light source.

[0064] In some embodiments, the data transmission device 500 further includes a switch 540, which is connected to the input / output control board 510 and the server 800, respectively.

[0065] In the implementation process, the server 800 includes a CPU, motherboard and memory. The CPU can be an Intel I7-13700KF, the motherboard can be an ASUSB760-A, and the memory can be DDR5 5600 32GB.

[0066] The switch 540 can transmit the signals output by the input / output control board 510 to the server 800, so that the server 800 can perform further signal processing based on the output signals.

[0067] It should be noted that currently, the detection of surface defects on welding wheels is mainly done manually. After applying the technical solution of this application, the defect detection rate is over 95% and the defect identification rate is over 90%, which can enable early detection and early handling of problems. This not only reduces the potential quality accidents caused by surface defects on welding wheels, but also improves the work efficiency of on-site operators.

[0068] The 1420 cold rolling continuous annealing line experiences three production shutdowns annually due to welding wheel surface quality issues. Each shutdown requires at least five hours of process recovery time, with an hourly output of 45 tons and a profit of 500 yuan per ton of steel. Applying the technical solution proposed in this application is expected to increase annual economic benefits by 3 × 5 × 45 × 500 = 337,500 yuan.

[0069] This embodiment of the application includes a first camera, a second camera, a first light source, a second light source, a data transmission device, a welding wheel control device, a relay, and a server. The welding wheel control device is connected to the upper welding wheel, the lower welding wheel, and the relay. The data transmission device is connected to the first camera, the second camera, the first light source, the second light source, and the relay. The relay is also connected to the first camera and the second camera. The welding wheel control device sends a energizing signal to the relay after the upper and lower welding wheels have been ground. The relay is energized upon receiving the energizing signal to connect the welding wheel control device and the data transmission device.

[0070] The data transmission device, when connected to the welding wheel control device, sends frame synchronization signals to the first camera and the second camera, and activation signals to the first light source and the second light source, respectively. The first camera, under the influence of the frame synchronization signal and the first light source, acquires an image of the upper welding wheel surface, and sends this image to the server. The second camera, under the influence of the frame synchronization signal and the second light source, acquires an image of the lower welding wheel surface, and sends this image to the server. The server performs defect detection based on the upper and lower welding wheel images. This scheme provides a clear image of the welding wheel surface, allowing for defect detection that avoids oversights and improves detection accuracy.

[0071] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A welding wheel surface defect detection system characterized by, The application relates to a welding wheel control device and a server. The welding wheel control device comprises a first camera, a second camera, a first light source, a second light source, a data transmission device, a welding wheel control device, a relay and a server. The welding wheel control device is connected with an upper welding wheel, a lower welding wheel and the relay respectively, the data transmission device is connected with the first camera, the second camera, the first light source, the second light source and the relay respectively, and the server is connected with the first camera and the second camera respectively. The welding wheel control device is used for sending an attraction signal to the relay after the upper welding wheel and the lower welding wheel are finished with grinding. The relay is used for being attracted when the attraction signal is received, so as to turn on the welding wheel control device and the data transmission device. The data transmission device is used for sending a frame synchronization signal to the first camera and the second camera and sending an opening signal to the first light source and the second light source when the welding wheel control device is turned on. The first camera is used for collecting images of the surface of the upper welding wheel under the action of the frame synchronization signal and the first light source, obtaining upper welding wheel images and sending the upper welding wheel images to the server. The second camera is used for collecting images of the surface of the lower welding wheel under the action of the frame synchronization signal and the second light source, obtaining lower welding wheel images and sending the lower welding wheel images to the server. The server is used for carrying out defect detection according to the upper welding wheel images and the lower welding wheel images.

2. The weld wheel surface defect detection system of claim 1, wherein, The surface of the upper welding wheel is provided with an upper welding wheel surface detection point, the surface of the lower welding wheel is provided with a lower welding wheel surface detection point, the first camera and the first light source are located on the two sides of the normal line of the upper welding wheel surface detection point respectively, and the second camera and the second light source are located on the two sides of the normal line of the lower welding wheel surface detection point respectively.

3. The weld wheel surface defect detection system of claim 2, wherein, The angle between the straight line from the first camera to the upper welding wheel surface detection point and the normal line of the upper welding wheel surface detection point is 25 degrees, and the angle between the straight line from the first light source to the upper welding wheel surface detection point and the normal line of the upper welding wheel surface detection point is 22 degrees or 26 degrees.

4. The weld wheel surface defect detection system of claim 3, wherein, The angle between the straight line from the second camera to the lower welding wheel surface detection point and the normal line of the lower welding wheel surface detection point is 25 degrees, and the angle between the straight line from the second light source to the lower welding wheel surface detection point and the normal line of the lower welding wheel surface detection point is 22 degrees or 26 degrees.

5. The weld wheel surface defect detection system of claim 1, wherein, The first light source and the second light source are both LED blue light sources.

6. The weld wheel surface defect detection system of claim 1, wherein, The scanning speed of the first camera and the second camera is greater than the running speed of the upper welding wheel or the lower welding wheel.

7. The weld wheel surface defect detection system of claim 6, wherein, The maximum scanning line frequency of the first camera and the second camera is 18 thousand lines per second.

8. The weld wheel surface defect detection system of claim 1, wherein, The data transmission device comprises an input-output control board and a frame synchronization board. The input-output control board is connected with the input end of the frame synchronization board and the relay respectively. The output end of the frame synchronization board is connected with the first camera and the second camera respectively.

9. The weld wheel surface defect detection system of claim 8, wherein, The data transmission device further comprises a light source control board, an input end of the light source control board is connected with the input-output control board, and output ends of the light source control board are respectively connected with the first light source and the second light source.

10. The weld wheel surface defect detection system of claim 9, wherein, The data transmission device further comprises a switch, and the switch is respectively connected with the input-output control board and the server.

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