Drilling and chamfering defect detection device and method based on machine vision

Abstract

The invention discloses a drilling and chamfering defect detection device and method based on machine vision, and the device comprises a housing, a base arranged in the housing, a second support frame arranged at the outer side of the base, a front machine door arranged at the front end of the housing, a first motor installed at the right side of the base, a first connecting disc connected to the left side of the first motor, and a second connecting disc connected to the right side of the first connecting disc, a second connecting disc is arranged on the upper side of the first connecting disc, and a first supporting frame is arranged on the upper side of the second connecting disc. According to the drilling and chamfering defect detection device and method based on machine vision, the collection angle of the image collection part is conveniently adjusted in the use process, so that the image collection efficiency of the device on a product workpiece is improved, and meanwhile, the influence of ambient light on the image collection function of the device is conveniently reduced; therefore, the image acquisition quality of the device on the product workpiece is improved, the detection quality of the device on the product workpiece is improved, and a better detection effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field related to drilling chamfer defect detection, and specifically to a drilling chamfer defect detection device and method based on machine vision. Background Art

[0002] At present, cylindrical workpieces are a common type of workpiece, and the cylindrical workpiece is composed of a circular side surface and two bottom surfaces, and the two bottom surfaces and the circular side surfaces can be used as working surfaces. Therefore, before the workpiece is put into use, it is necessary to perform quality inspection on the drilling chamfer surface on the cylindrical part. Usually, manual inspection is used, which is not only prone to missed inspections or wrong inspections, but also slow in manual inspection speed and requires a lot of human resources, resulting in high inspection costs, which does not meet the requirements of modern industrial production. However, the current drilling chamfer defect detection device and method based on machine vision still have some shortcomings, such as; For example, the invention with authorization announcement number CN217180621U discloses a machine vision detection device for drilling chamfer defects, which relates to the technical field of drilling chamfer quality detection, including a mounting seat, an inner cavity of the mounting seat is equipped with a driving component, a turntable is installed on the top of the driving component, vertical plates are installed on the left and right ends of the top of the mounting seat, a controller is installed on the right side wall of the right end vertical plate, detection components are installed at the bottom of the two groups of vertical plates, and a top plate is installed on the top of the two groups of vertical plates. The present invention can drive the turntable to rotate through the coordinated arrangement of annular slide grooves, sliders and driving components, thereby driving the upper workpiece to rotate. At the same time, through the arrangement of a light beam transmitter, a light beam receiver, a controller and a camera, it is convenient to detect the workpiece, thereby replacing manual detection. Not only is the detection efficiency high and the detection cost is greatly reduced, but the detection accuracy is also high, which effectively ensures product quality and does not cause problems of false detection and missed detection.

[0003] The above-mentioned prior art solutions have the following defects: the existing drilling chamfer defect detection device is not convenient for adjusting the acquisition angle of the image acquisition parts during use, which greatly reduces the image acquisition efficiency of the device for the product workpiece. At the same time, it is not convenient to reduce the influence of ambient light on the image acquisition function of the device, which reduces the image acquisition quality of the device for the product workpiece, resulting in reduced detection quality of the device for the product workpiece. Therefore, the present invention provides a drilling chamfer defect detection device and method based on machine vision to solve the above-mentioned problems. Summary of the invention

[0004] To solve the problems raised in the above background technology. The present invention provides a drilling chamfer defect detection device and method based on machine vision, which has the characteristics of being easy to adjust the acquisition angle of the image acquisition part during use, so that the image acquisition efficiency of the device for the product workpiece is improved, and at the same time it is easy to reduce the influence of ambient light on the image acquisition function of the device, so that the image acquisition quality of the device for the product workpiece is improved, and the detection quality of the device for the product workpiece is improved.

[0005] To achieve the above object, the present invention provides the following technical solution: a drilling chamfer defect detection device and method based on machine vision, comprising: a housing, and a base arranged inside the housing, and a second support frame is arranged outside the base, and a front door is arranged at the front end of the housing, and further comprising: A first motor is installed on the right side of the base, and a first connecting disk is connected to the left side of the first motor, a second connecting disk is arranged on the upper side of the first connecting disk, and a first supporting frame is arranged on the upper side of the second connecting disk, a first mirror is arranged in the middle of the first supporting frame, and an annular light strip is arranged inside the first supporting frame, a first limiting block is arranged on the inner side of the second supporting frame, and a third supporting frame is arranged on the upper side of the second supporting frame, a guide block is arranged inside the third supporting frame, and a third connecting disk is arranged on the lower side of the guide block, a connecting block is arranged at the front end of the third connecting disk, and a second motor is installed on the rear side of the third connecting disk, a data interface is arranged at the lower end of the third supporting frame, and an image acquisition head is arranged on the lower side of the data interface, a limiting component is arranged on the right side of the image acquisition head, an image data processing module is arranged inside the front door, and an interactive display board is arranged on the front side of the image data processing module, and a wireless data transmitter is arranged on the upper side of the interactive display board.

[0006] Using the above technical solution, the limit assembly includes a second limit block installed on the right side of the image acquisition head, and a connecting rod passes through the middle of the second limit block, and a guide rod is arranged on the upper side of the second limit block, and a limit rod is arranged on the right side of the connecting rod.

[0007] As a preferred technical solution of the present invention, the limit rod is pulled to the right so that the limit rod releases the limit on the connecting rod. At this time, the connecting rod is rotated so that the connecting rod drives the second limit block to move to the right along the guide rod. At this time, the second limit block releases the limit on the image acquisition head, which makes it convenient for the operator to remove the image acquisition head from the lower side, thereby improving the disassembly, assembly and maintenance efficiency of the image acquisition head.

[0008] By adopting the above technical solution, the second limit block is relatively engaged with the image acquisition head, and the second limit block is relatively slidably arranged with the guide rod.

[0009] As a preferred technical solution of the present invention, the second limit block is guided by a guide rod, so that the second limit block is not easily displaced during displacement to the right, thereby improving the operational stability of the second limit block.

[0010] By adopting the above technical solution, the limit rod is relatively engaged with the connecting rod and the third support frame, and the connecting rod is relatively threadedly connected with the second limit block.

[0011] As a preferred technical solution of the present invention, the connecting rod is limited by a limiting rod, so that the connecting rod is not easy to rotate after the operator completes the disassembly and assembly of the image acquisition head, thereby improving the connection stability between the second limiting block and the image acquisition head.

[0012] According to the above technical solution, the first connection disk is relatively meshed with the second connection disk, the first support frame arranged on the upper side of the second connection disk is relatively rotatable with the base, and the first mirror surface is relatively engaged with the first support frame.

[0013] As a preferred technical solution of the present invention, the first motor drives the first connecting disk to rotate inside the base, so that the first connecting disk pushes the second connecting disk to rotate inside the base, resulting in the second connecting disk driving the first support frame to rotate on the upper side of the base, and the first support frame drives the product workpiece on its upper side to adjust its angle, thereby improving the image acquisition efficiency of the device.

[0014] By adopting the above technical solution, the guide block and the second support frame are arranged to slide relative to each other, and the longitudinal section of the second support frame is an arc-shaped structure.

[0015] As a preferred technical solution of the present invention, the third support frame is supported by a guide block, so that the third support frame is not easily displaced during internal displacement of the second support frame, thereby improving the displacement stability of the third support frame.

[0016] By adopting the above technical solution, the third connecting disk is relatively meshed with the first limiting block, and the connecting block arranged at the front end of the third connecting disk is relatively rotatable with the third supporting frame, and the longitudinal section of the connecting block is a "T"-shaped structure.

[0017] As a preferred technical solution of the present invention, the third connecting disk is driven by the second motor to rotate along the connecting block inside the third support frame, so that the third connecting disk drives the third support frame to slide inside the second support frame. At this time, the third support frame drives the image acquisition head to adjust the horizontal angle inside the outer shell, thereby improving the image acquisition efficiency of the device.

[0018] By adopting the above technical solution, the front door and the housing are rotatably arranged relative to each other, and the interactive display board and the front door are relatively engaged with each other.

[0019] As a preferred technical solution of the present invention, the internal space of the shell is sealed by the front door cooperating with the shell, so that ambient light is not easy to enter the interior of the shell, thereby reducing the impact of the ambient light device on the detection quality.

[0020] According to the above technical solution, a second mirror surface is arranged on the outer side of the shell, a positioning rod is arranged on the outer side of the second mirror surface, and a third mirror surface is arranged on the upper side of the shell.

[0021] As a preferred technical solution of the present invention, the second mirror cooperates with the third mirror to reflect the light emitted by the annular light strip, so that the light can be irradiated on the surface of the product workpiece from different angles, reducing the shadow of the workpiece in the blind spot and improving the image acquisition quality of the device.

[0022] By adopting the above technical solution, the second mirror surface is arranged symmetrically with respect to the central axis of the housing, and the second mirror surface is relatively engaged with the positioning rod.

[0023] As a preferred technical solution of the present invention, when the second mirror is damaged and needs to be replaced, the second mirror is pulled inward so that the positioning rod is loosened from its action on the second mirror, thereby improving the efficiency of disassembly and maintenance of the second mirror.

[0024] Using the above technical solution, a drilling chamfer defect detection method based on machine vision is characterized by comprising the following steps: Step 1: Place the product workpiece on the upper side of the first mirror surface and close the front door at the same time, so that the interior of the housing remains dim and the influence of ambient light on the accuracy of product workpiece image acquisition is reduced; Step 2: Light up the annular light belt so that the annular light belt irradiates the product workpiece with light. At the same time, because the first mirror cooperates with the second mirror and the third mirror to reflect the light emitted by the annular light belt, the irradiation range of the annular light belt on the product workpiece is increased, and the image acquisition efficiency of the device is improved; Step 3: The image acquisition head is used to acquire images of the product workpiece, and the image data processing module is used to pre-process the acquired image data, and the image quality is improved by denoising, contrast enhancement, grayscale conversion, etc., so as to facilitate subsequent image analysis; Step 4: After the preprocessing is completed, the image data is subjected to feature extraction by an image processing algorithm, such as contour, angle, size, etc. At this time, the extracted features are compared with the standard template or threshold according to the preset defect standard to determine whether there is a defect and the defect type; Step 5: The test results are output to the interactive display board in real time, and a test report can be generated according to demand, so that operators can observe the test status of product workpieces in real time.

[0025] Compared with the prior art, the beneficial effects of the present invention are: it is convenient to adjust the acquisition angle of the image acquisition part during use, so that the image acquisition efficiency of the device for the product workpiece is improved, and it is convenient to reduce the influence of ambient light on the image acquisition function of the device, so that the image acquisition quality of the device for the product workpiece is improved, so that the device improves the detection quality of the product workpiece, and has a better detection effect, as shown in the following content: 1. The present invention drives the second limit block to move to the right at the right lower end of the third support frame by setting a guide rod to cooperate with the connecting rod, so that the second limit block relaxes the limit on the image acquisition head, which is convenient for the operator to take out the image acquisition head from the lower side, thereby improving the disassembly and maintenance efficiency of the image acquisition head; 2. The present invention sets a first motor to cooperate with the first connecting plate to push the second connecting plate and the first supporting frame to rotate on the upper side of the base, so that the first supporting frame drives the product workpiece on its upper side to adjust the angle, and at the same time, the third connecting plate cooperates with the first limit block to drive the third supporting frame to slide in the middle of the second supporting frame, so that the third supporting frame drives the image acquisition head to adjust the horizontal angle inside the shell, thereby improving the image acquisition efficiency of the image acquisition head for the product workpiece; 3. The present invention sets a front door to cooperate with the shell to seal the internal space of the shell, so that ambient light is not easy to enter the interior of the shell, reducing the impact of the ambient light device on the detection quality. At the same time, the first mirror cooperates with the second mirror and the third mirror to reflect the light emitted by the annular light strip, so that the light can be irradiated on the surface of the product workpiece from different angles, reducing the shadow of the workpiece in the blind spot and improving the image acquisition quality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the front cross-sectional structure of the present invention; Figure 2 It is a schematic diagram of the side cross-sectional structure of the present invention; Figure 3 It is a schematic diagram of a top-view cross-sectional structure of the present invention; Figure 4 For the present invention Figure 1 The enlarged structural diagram at A in the middle; Figure 5 This is a schematic diagram of the overall structure of the connection between the first support frame and the first mirror surface of the present invention; Figure 6 It is a schematic diagram of the overall structure of the third support frame and the third connecting plate connected to each other in the present invention.

[0027] In the figure: 1. shell; 2. base; 3. first motor; 4. first connecting plate; 5. second connecting plate; 6. first support frame; 7. first mirror; 8. ring light strip; 9. second support frame; 10. first limit block; 11. third support frame; 12. guide block; 13. third connecting plate; 14. connecting block; 15. second motor; 16. data interface; 17. image acquisition head; 18. limit assembly; 1801. second limit block; 1802. connecting rod; 1803. guide rod; 1804. limit rod; 19. second mirror; 20. positioning rod; 21. third mirror; 22. front door; 23. image data processing module; 24. interactive display board; 25. wireless data transmitter. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-6 The present invention provides the following technical solution: a drilling chamfer defect detection device and method based on machine vision, comprising: a housing 1, and a base 2 arranged inside the housing 1, and a second support frame 9 is arranged outside the base 2, and a front door 22 is arranged at the front end of the housing 1, characterized in that it also includes: The first motor 3 is installed on the right side of the base 2, and the left side of the first motor 3 is connected to the first connecting plate 4, the upper side of the first connecting plate 4 is provided with a second connecting plate 5, and the upper side of the second connecting plate 5 is provided with a first supporting frame 6, the middle part of the first supporting frame 6 is provided with a first mirror 7, and the inside of the first supporting frame 6 is provided with an annular light strip 8, the inner side of the second supporting frame 9 is provided with a first limiting block 10, and the upper side of the second supporting frame 9 is provided with a third supporting frame 11, the inner side of the third supporting frame 11 is provided with a guide block 12, and the lower side of the guide block 12 is provided with a A third connection disk 13 is provided, a connection block 14 is provided at the front end of the third connection disk 13, and a second motor 15 is installed on the rear side of the third connection disk 13, a data interface 16 is provided at the lower end of the third support frame 11, and an image acquisition head 17 is provided at the lower side of the data interface 16, and a limit position component 18 is provided on the right side of the image acquisition head 17, an image data processing module 23 is provided inside the front door 22, and an interactive display board 24 is provided on the front side of the image data processing module 23, and a wireless data transmitter 25 is provided on the upper side of the interactive display board 24; As attached Figure 1 , Attachment Figure 4 and attached Figure 6 As shown in the figure, the limiting assembly 18 includes a second limiting block 1801 installed on the right side of the image acquisition head 17, and a connecting rod 1802 runs through the middle of the second limiting block 1801, and a guide rod 1803 is arranged on the upper side of the second limiting block 1801, and a limiting rod 1804 is arranged on the right side of the connecting rod 1802, the second limiting block 1801 is relatively engaged with the image acquisition head 17, and the second limiting block 1801 and the guide rod 1803 are relatively slidably arranged, the limiting rod 1804 and the connecting rod 1802 and the third support frame 11 are relatively engaged, and the connecting rod 1802 is relatively engaged with the third support frame 11. The rod 1802 is relatively threadedly connected to the second limit block 1801. By pulling the limit rod 1804 to the right, the limit rod 1804 releases the limit on the connecting rod 1802. At this time, the connecting rod 1802 is rotated, so that the connecting rod 1802 drives the second limit block 1801 to move to the right along the guide rod 1803. At this time, the second limit block 1801 releases the limit on the image acquisition head 17, which is convenient for the operator to take out the image acquisition head 17 from the lower side, thereby completing the convenient disassembly and assembly of the image acquisition head 17 and improving the disassembly and assembly maintenance efficiency of the image acquisition head 17. As attached Figure 1 , Attachment Figure 2 and attached Figure 5 As shown in the figure, the first connecting disk 4 is relatively meshed with the second connecting disk 5, and the first support frame 6 arranged on the upper side of the second connecting disk 5 is relatively rotated with the base 2, and the first mirror surface 7 is relatively engaged with the first support frame 6, the guide block 12 is relatively slidably arranged with the second support frame 9, and the longitudinal section of the second support frame 9 is an arc-shaped structure, the third connecting disk 13 is relatively meshed with the first limit block 10, and the connecting block 14 arranged at the front end of the third connecting disk 13 is relatively rotated with the third support frame 11, and the longitudinal section of the connecting block 14 is a "T"-shaped structure, and the first connecting disk 4 is driven by the first motor 3 to rotate inside the base 2, so that the first connecting disk 4 pushes the second connecting disk 5 to rotate inside the base 2 The second connecting plate 5 drives the first supporting frame 6 to rotate on the upper side of the base 2, and drives the product workpiece on its upper side to adjust the angle through the first supporting frame 6, so as to complete the display angle adjustment work of the product workpiece, and improve the image acquisition efficiency of the device; at the same time, the third connecting plate 13 is driven by the second motor 15 to rotate along the connecting block 14 inside the third supporting frame 11, so that the third connecting plate 13 drives the third supporting frame 11 to slide along the guide block 12 inside the second supporting frame 9, and at this time, the third supporting frame 11 drives the image acquisition head 17 to adjust the horizontal angle inside the shell 1, so as to complete the adjustment work of the acquisition angle of the image acquisition head 17, and further improve the image acquisition efficiency of the device; As attached Figure 1 and attached Figure 3As shown in , the front door 22 is relatively rotatably arranged with the shell 1, and the interactive display board 24 is relatively engaged with the front door 22, a second mirror 19 is arranged on the outer side of the shell 1, and a positioning rod 20 is arranged on the outer side of the second mirror 19, and a third mirror 21 is arranged on the upper side of the shell 1, the second mirror 19 is arranged symmetrically about the central axis of the shell 1, and the second mirror 19 and the positioning rod 20 are relatively engaged, the front door 22 cooperates with the shell 1 to seal the internal space of the shell 1, so that the ambient light is not easy to enter the interior of the shell 1, and the influence of the ambient light on the detection quality of the device is reduced, and at the same time, the annular light belt 8 irradiates the product workpiece with light. At this time, because the first mirror 7 cooperates with the second mirror 19 and the third mirror 21 to reflect the light emitted by the annular light belt 8, the light can be irradiated on the surface of the product workpiece from different angles, reducing the shadow of the workpiece in the dead angle, and improving the image acquisition quality of the device; The drilling chamfer defect detection device of the above structure is used for detection, and the method is as follows: Step 1, the product workpiece is placed on the upper side of the first mirror surface 7, and the front door 22 is closed at the same time, so that the interior of the housing 1 remains dim, reducing the influence of ambient light on the accuracy of product workpiece image acquisition; Step 2: Light up the annular light strip 8 so that the annular light strip 8 irradiates the product workpiece with light. At the same time, because the first mirror 7 cooperates with the second mirror 19 and the third mirror 21 to reflect the light emitted by the annular light strip 8, the irradiation range of the annular light strip 8 on the product workpiece is increased, and the image acquisition efficiency of the device is improved; Step 3: The image acquisition head 17 is used to acquire images of the product workpiece, and the image data processing module 23 is used to pre-process the acquired image data, and the image quality is improved by denoising, contrast enhancement, grayscale conversion, etc., so as to facilitate subsequent image analysis; Step 4: After the preprocessing is completed, the image data is subjected to feature extraction by an image processing algorithm, such as contour, angle, size, etc. At this time, the extracted features are compared with the standard template or threshold according to the preset defect standard to determine whether there is a defect and the defect type; Step 5: The test results are output to the interactive display board 24 in real time, and a test report can be generated according to demand, so that the operator can observe the test status of the product workpiece in real time.

[0030] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drilling chamfer defect detection device based on machine vision, comprising: A housing (1), and a base (2) disposed inside the housing (1), and a second support frame (9) is disposed outside the base (2), and a front door (22) is disposed at the front end of the housing (1), characterized in that it also includes: A first motor (3) is mounted on the right side of the base (2), and a first connection plate (4) is connected to the left side of the first motor (3); a second connection plate (5) is arranged on the upper side of the first connection plate (4), and a first support frame (6) is arranged on the upper side of the second connection plate (5); a first mirror surface (7) is arranged in the middle of the first support frame (6), and an annular light strip (8) is arranged inside the first support frame (6); a first limiting block (10) is arranged on the inner side of the second support frame (9), and a third support frame (11) is arranged on the upper side of the second support frame (9); a guide block (12) is arranged inside the third support frame (11), and the lower portion of the guide block (12) is provided with a guide block (12). A third connection disk (13) is provided on the side thereof, a connection block (14) is provided on the front end of the third connection disk (13), and a second motor (15) is installed on the rear side of the third connection disk (13); a data interface (16) is provided on the lower end of the third support frame (11), and an image acquisition head (17) is provided on the lower side of the data interface (16), and a limit position assembly (18) is provided on the right side of the image acquisition head (17); an image data processing module (23) is provided inside the front door (22), and an interactive display board (24) is provided on the front side of the image data processing module (23), and a wireless data transmitter (25) is provided on the upper side of the interactive display board (24).

2. The drilling chamfer defect detection device based on machine vision according to claim 1 is characterized in that: The limiting assembly (18) comprises a second limiting block (1801) mounted on the right side of the image acquisition head (17), a connecting rod (1802) passing through the middle of the second limiting block (1801), a guiding rod (1803) being arranged on the upper side of the second limiting block (1801), and a limiting rod (1804) being arranged on the right side of the connecting rod (1802).

3. The drilling chamfer defect detection device based on machine vision according to claim 2 is characterized in that: The second limit block (1801) is arranged to be relatively engaged with the image acquisition head (17), and the second limit block (1801) is arranged to slide relatively with the guide rod (1803).

4. The drilling chamfer defect detection device based on machine vision according to claim 2 is characterized in that: The limiting rod (1804) is relatively engaged with the connecting rod (1802) and the third support frame (11), and the connecting rod (1802) is relatively threadedly connected to the second limiting block (1801).

5. The drilling chamfer defect detection device based on machine vision according to claim 1, characterized in that: The first connection disk (4) is arranged in meshing relationship with the second connection disk (5), and the first support frame (6) arranged on the upper side of the second connection disk (5) is arranged to rotate relative to the base (2), and the first mirror surface (7) is arranged in meshing relationship with the first support frame (6).

6. The drilling chamfer defect detection device based on machine vision according to claim 1, characterized in that: The guide block (12) and the second support frame (9) are arranged to slide relative to each other, and the longitudinal section of the second support frame (9) is an arc-shaped structure.

7. The drilling chamfer defect detection device based on machine vision according to claim 1 is characterized in that: The third connection disk (13) is arranged to mesh with the first limit block (10) relative to each other, and a connection block (14) arranged at the front end of the third connection disk (13) is arranged to rotate relative to the third support frame (11), and the longitudinal section of the connection block (14) is a "T"-shaped structure.

8. The drilling chamfer defect detection device based on machine vision according to claim 1, characterized in that: The front door (22) and the housing (1) are rotatably arranged relative to each other, and the interactive display board (24) and the front door (22) are snap-fitted relative to each other.

9. The drilling chamfer defect detection device based on machine vision according to claim 1, characterized in that: A second mirror surface (19) is arranged on the outside of the housing (1), and a positioning rod (20) is arranged on the outside of the second mirror surface (19), and a third mirror surface (21) is arranged on the upper side of the housing (1), the second mirror surface (19) is arranged symmetrically about the central axis of the housing (1), and the second mirror surface (19) and the positioning rod (20) are arranged in a relatively engaged manner.

10. The drilling chamfer defect detection device based on machine vision according to claim 1, wherein the detection method comprises the following steps: Step 1: placing the product workpiece on the upper side of the first mirror surface (7), and closing the front door (22) at the same time, so that the interior of the housing (1) remains dim, thereby reducing the influence of ambient light on the accuracy of product workpiece image acquisition; Step 2: Lighting up the annular light strip (8) so that the annular light strip (8) irradiates the product workpiece with light. At the same time, because the first mirror (7) cooperates with the second mirror (19) and the third mirror (21) to reflect the light emitted by the annular light strip (8), the irradiation range of the annular light strip (8) on the product workpiece is increased, thereby improving the image acquisition efficiency of the device; Step 3: The image acquisition head (17) is used to acquire images of the product workpiece, and the image data processing module (23) is used to pre-process the acquired image data, and the image quality is improved by denoising, contrast enhancement, grayscale conversion, etc., so as to facilitate subsequent image analysis; Step 4: After the preprocessing is completed, the image data is subjected to feature extraction by an image processing algorithm, such as contour, angle, size, etc. At this time, the extracted features are compared with the standard template or threshold according to the preset defect standard to determine whether there is a defect and the defect type; Step 5: The test results are output to the interactive display board (24) in real time, and a test report can be generated according to demand, so that the operator can observe the test status of the product workpiece in real time.

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