A defect detection apparatus and method

Abstract

The application relates to the technical field of defect detection, in particular to a defect detection device and method. The defect detection device comprises a first detection assembly and a second detection assembly. The first detection assembly comprises a positioning unit and a first vision unit, the positioning unit comprises a detection table. The first vision unit comprises a first camera and a second camera, the first camera is located above the detection table, and the shooting direction of the first camera faces downward. The second camera is located on the horizontal side of the detection table, and the shooting direction of the second camera faces the horizontal direction. The second detection assembly comprises a clamping unit and a second vision unit, the clamping unit comprises a clamping part and a first driving part, and the first driving part is connected with the clamping part. The second vision unit comprises a third camera, and the shooting direction of the third camera faces the vertical direction. The application can solve the problem of low appearance defect detection efficiency of a cylindrical part.

Description

Technical Field

[0001] This application relates to the field of defect detection technology, and more specifically, to a defect detection device and method. Background Technology

[0002] Cylindrical parts are widely used in the field of mechanical components. Detecting surface defects in these parts typically requires simultaneous coverage of multiple inspection areas, including the end face, inner circumferential surface, and outer circumferential surface. This involves numerous inspection points and a complex spatial distribution of inspection surfaces, placing high demands on the imaging perspective. Especially for cylindrical parts with unequal diameters at their two ends along the axial direction, the inner surface is obscured by depth. If observation is taken from the smaller diameter end, problems such as limited field of view, incomplete imaging of localized areas of the inner wall, and obscuring defect features can easily occur. Therefore, it is usually necessary to take pictures from the larger diameter side towards the inside of the part to obtain a complete and clear image of the inner circumferential surface, ensuring the accuracy of inner wall defect identification.

[0003] Taking a cylindrical part with different diameters, such as a dust cover used on a drive shaft assembly, as an example, the dust cover is a typical cylindrical component with inconsistent diameters at both ends. Before leaving the factory, it is necessary to conduct appearance defect inspections on its two end faces, outer circumferential surface, and inner wall surface to check for various surface defects such as cracks, missing materials, burrs, and shape differences. In existing inspection methods, to ensure complete imaging of the inner circumferential surface, observation must be performed from the direction of the large end opening of the dust cover. Due to the constraint of this specific observation angle, it is difficult to simultaneously complete the appearance defect inspection of the outer circumferential surface, both end faces, and the inner circumferential surface at the same station. If multi-station inspection is adopted, multiple transfers, flips, or repositioning of the workpiece are required, which is cumbersome, has a long inspection cycle, and low overall defect inspection efficiency, making it difficult to meet the production needs of rapid full inspection of large batches of dust cover parts. Therefore, there is an urgent need to develop an inspection solution that is suitable for cylindrical parts with different diameters at both ends, can take into account multiple surface inspection perspectives, and improves the efficiency of appearance defect inspection. Summary of the Invention

[0004] To address the problem of low efficiency in detecting appearance defects in cylindrical parts, this application provides a defect detection device and method.

[0005] In a first aspect, this application provides a defect detection device, the defect detection device comprising:

[0006] The first detection component includes a positioning unit and a first vision unit; the positioning unit includes a detection platform; the first vision unit includes a first camera and a second camera; the first camera is located above the detection platform; the first camera's shooting direction is downward; the second camera is located on a horizontal side of the detection platform; the second camera's shooting direction is horizontal; the shooting areas of both the first camera and the second camera cover the space above the detection platform.

[0007] The second detection component includes a clamping unit and a second vision unit; the clamping unit includes a clamping part and a first driving part; the first driving part is connected to the clamping part; the second vision unit includes a third camera; the shooting direction of the third camera is vertically oriented; the first driving part can drive the clamping part to move within the shooting area of ​​the third camera.

[0008] Optionally, the defect detection device further includes an illumination assembly, which includes a first light source, a second light source, and a third light source;

[0009] The first light source is located beside the first camera; the light emission direction of the first light source is downward;

[0010] The second light source is located beside the second camera; the light emission direction of the second light source is horizontal; the illumination area of ​​the second light source covers the shooting area of ​​the second camera;

[0011] The third light source is located at the center of the detection platform; the light emission direction of the third light source is upward.

[0012] The first vision unit further includes a fourth camera; the fourth camera is located on the horizontal side of the detection platform away from the second light source; the shooting direction of the fourth camera is set horizontally; the shooting area of ​​the fourth camera covers the space above the detection platform.

[0013] Optionally, the first vision unit further includes a fifth camera; the fifth camera is positioned at an angle downwards; the shooting area of ​​the fifth camera covers the area above the detection platform.

[0014] The lighting assembly also includes a fourth light source; the fourth light source is located beside the fifth camera; the illumination area of ​​the fourth light source covers the shooting area of ​​the fifth camera.

[0015] Optionally, the positioning unit further includes a second driving unit; the second driving unit is connected to the detection stage; the second driving unit is capable of driving the detection stage to rotate.

[0016] Optionally, the first driving unit can drive the clamping unit to rotate and move up and down.

[0017] Optionally, the second vision unit further includes a sixth camera; the sixth camera is positioned horizontally; the first driving unit is capable of driving the clamping unit to move within the shooting area of ​​the sixth camera.

[0018] Optionally, the defect detection device further includes a feeding assembly, which includes a feeding conveying unit and a feeding gripping unit; the feeding gripping unit includes a gripping part and a third driving part; the third driving part is connected to the gripping part; the third driving part drives the gripping part to move between the feeding conveying unit and the detection table;

[0019] The first driving unit can drive the clamping unit to move above the detection stage.

[0020] Secondly, this application provides a defect detection method, applied to the defect detection apparatus described in any one of the first aspects, the defect detection method comprising:

[0021] The dust cover is placed vertically on the testing platform with its first port facing upwards and its second port facing downwards; wherein the diameter of the first port is smaller than the diameter of the second port.

[0022] Based on the fact that the dust cover is located on the testing platform, the dust cover is subjected to a first defect detection;

[0023] Based on the completion of the first defect detection, a second defect detection is performed on the dust cover;

[0024] The first defect detection includes:

[0025] Take a first image of the first port of the dust cover;

[0026] Determine whether the dust cover has defects based on the first image;

[0027] Take a second image of the outer peripheral surface of the dust cover;

[0028] Determine whether the dust cover has defects based on the second image;

[0029] The second defect detection includes:

[0030] Take a third image of the second port of the dust cover;

[0031] Determine whether the dust cover has defects based on the third image.

[0032] Optionally, the first defect detection further includes:

[0033] Based on the completion of the first image capture, the inside of the dust cover is illuminated, and a fourth image of the outer peripheral surface of the dust cover is captured.

[0034] Determine whether the dust cover leaks light based on the fourth image;

[0035] Once the fourth image is captured, the light source for illuminating the inside of the dust cover is turned off.

[0036] Take a fifth image of the inner peripheral wall of the first port;

[0037] Determine whether the dust cover has defects based on the fifth image.

[0038] Optionally, capturing a third image of the second port of the dust cover includes:

[0039] Clamp the first port of the dust cover and control the dust cover to intermittently rise and fall in a vertical position;

[0040] During the static intervals of each intermittent raising and lowering of the dust cover, a sixth image of the inner peripheral wall of the dust cover at multiple preset height positions is captured from the second port.

[0041] Determine whether the dust cover has defects based on the sixth image.

[0042] To address the problem of low efficiency in detecting surface defects in cylindrical parts, this application offers the following advantages:

[0043] Through the coordination of the positioning unit and the first vision unit of the first detection component, the detection table supports the cylindrical part with its first port facing upwards. The first camera captures an image of the end face of the first port from above, while the second camera captures an image of the outer peripheral surface from a horizontal direction. This enables centralized detection of the small port end face and the outer peripheral surface of the cylindrical part, accurately determining whether there are missing materials or burrs on the small port end face, and whether there are defects such as wrinkles, burrs, or cracks on the outer peripheral surface of the part near the small port. Through the clamping unit and the second vision unit of the second detection component, the first drive unit drives the clamping unit to move within the shooting area of ​​the third camera, allowing the third camera to vertically capture an image of the inner peripheral surface of the cylindrical part from its second port. This enables detection of the inner peripheral surface from the large port, detecting defects such as bulges and bubbles on the inner surface. Thus, through the automated collaborative operation of the first and second detection components, defect detection at different locations is integrated, categorized, and uniformly detected, reducing the number of part orientation adjustments and improving the detection efficiency of cylindrical parts. Attached Figure Description

[0044] Figure 1 A schematic diagram of the structure of a defect detection device according to one embodiment is shown;

[0045] Figure 2 A front view of a defect detection apparatus according to one embodiment is shown;

[0046] Figure 3 A top view of a defect detection device according to one embodiment is shown;

[0047] Figure 4 A flowchart illustrating a defect detection method according to one embodiment is shown.

[0048] Reference numerals: 10, First detection component; 11, Positioning unit; 111, Detection stage; 112, Second drive unit; 12, First vision unit; 121, First camera; 122, Second camera; 123, Fourth camera; 124, Fifth camera; 20, Second detection component; 21, Clamping unit; 211, Clamping part; 212, First drive unit; 22, Second vision unit; 221, Third camera; 222, Sixth camera; 30, Dust cover. Detailed Implementation

[0049] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0050] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0051] Example 1:

[0052] like Figure 1As shown, taking a cylindrical part with different diameters, such as a dust cover 30 used on a drive shaft assembly, as an example, the dust cover 30 is a typical cylindrical component with inconsistent diameters at both ends. Before leaving the factory, it is necessary to conduct appearance defect inspections on its two end faces, outer circumferential surface, and inner wall surface to check for various surface defects such as cracks, missing materials, burrs, and shape differences. In the existing inspection methods, in order to ensure complete imaging of the inner circumferential surface, it is necessary to observe from the direction of the large end opening of the dust cover 30. Due to the constraint of this specific observation angle, it is difficult to simultaneously complete the appearance defect inspection of the outer circumferential surface, two end faces, and inner circumferential surface at the same station. If multi-station inspection is adopted, multiple transfers, flips, or repositioning of the workpiece are required, which is cumbersome, has a long inspection cycle, and low overall defect inspection efficiency, making it difficult to meet the production needs of rapid full inspection of large batches of dust cover 30 parts. Therefore, it is urgent to develop an inspection solution that is suitable for cylindrical parts with different diameters at both ends, can take into account multiple surface inspection perspectives, and improves the efficiency of appearance defect inspection.

[0053] like Figure 1 As shown, this embodiment provides a defect detection device suitable for detecting appearance defects in cylindrical parts. The cylindrical part is exemplified by a dust cover 30.

[0054] like Figure 1 and Figure 2 As shown, the defect detection device includes a first detection component 10 and a second detection component 20. The first detection component 10 includes a positioning unit 11 and a first vision unit 12. The positioning unit 11 includes a detection table 111, which supports a dust cover 30, allowing the dust cover 30 to be placed vertically on the detection table 111 with its first port facing upwards and its second port facing downwards, thus providing a stable positioning base for the dust cover 30. The first vision unit 12 includes a first camera 121 and a second camera 122. The first camera 121 is located above the detection table 111. The shooting direction of the first camera 121 is downwards. Preferably, the first camera 121 is located directly above the detection table 111. The second camera 122 is located on the horizontal side of the detection table 111, and the shooting direction of the second camera 122 is horizontal. The shooting areas of both the first camera 121 and the second camera 122 cover the space above the detection table 111, thereby enabling the first camera 121 and the second camera 122 to perform image detection on the dust cover 30 on the detection table 111. When the first vision unit 12 is working, the first camera 121 takes a top-down image of the end face of the first port of the dust cover 30, that is, the end face image of the small port. The second camera 122 takes a horizontal image of the outer peripheral surface of the dust cover 30 near the first port. Thus, through the cooperation of the first camera 121 and the second camera 122, the end face and outer peripheral surface of the first port can be efficiently detected, and the end face or burr of the first port can be accurately determined. It can also determine whether there are defects such as wrinkles, burrs, cracks, or shape that does not conform to the design on the outer peripheral surface of the dust cover 30 near the first port.

[0055] like Figure 1 and Figure 2 As shown, the second detection component 20 includes a clamping unit 21 and a second vision unit 22. The clamping unit 21 includes a clamping part 211 and a first driving part 212, which is connected to the clamping part 211. The second vision unit 22 includes a third camera 221, which is vertically oriented. The first driving part 212 can drive the clamping part 211 to move within the shooting area of ​​the third camera 221. The clamping unit 21 can be an automated robotic arm. When the second detection component 20 is working, the first driving part 212 drives the clamping part 211 to clamp the first port of the dust cover 30, so that the second port of the dust cover 30 faces the third camera 221. The third camera 221 captures the inner circumferential surface of the dust cover 30 from a vertical position, thereby capturing the inner circumferential surface of the dust cover 30 to detect whether there are defects such as bulges or bubbles on the inner surface.

[0056] Therefore, through the automated collaborative operation of the first detection component 10 and the second detection component 20, different positioning methods can be adapted to detect different types of defects. Specifically, for the detection of large ports, clamping positioning of small ports is adopted, which enables the dust cover 30 to adjust its posture flexibly while clamped; for the detection of small ports, the positioning method supported by the detection table 111 is adopted, which enables the dust cover 30 to perform sufficient detection at multiple positions of small ports while maintaining a stable posture. This embodiment can integrate and classify defect detection at different positions for unified detection, reduce the number of posture adjustments required for the dust cover 30, ensure the positioning stability and rapid response of posture adjustments for various defect detections, and thus improve the detection efficiency of the dust cover 30.

[0057] In some embodiments, such as Figure 1 and Figure 2 As shown, the third camera 221 can be used for upward shooting, so that after the clamping part 211 clamps the first port of the dust cover 30 and removes the dust cover 30 from the detection table 111, the second port faces downward and is suspended in the air. Using the third camera 221 to shoot upward can reduce the adjustment of the clamping part 211 to the posture of the dust cover 30, further improve the detection efficiency, and at the same time reduce the requirement for the degree of freedom of movement of the clamping unit 21, thereby reducing the equipment cost.

[0058] In some embodiments, the third camera 221 can also be positioned for overhead shooting (not shown) to reduce the impact of dust and other contaminants on the third camera 221. Furthermore, by designing the third camera 221 to shoot from above, the positions where the first detection component 10 and the second detection component 20 detect the dust cover 30 can be distinguished by height, thereby reducing mutual interference from shooting conditions such as lighting.

[0059] In some embodiments, such as Figure 1 and Figure 2 As shown, a positioning groove can also be set on the testing table 111, and the bottom end of the dust cover 30, i.e. the second port, is placed in the positioning groove. The positioning groove is used to limit the bottom end of the dust cover 30 to ensure the stability of the dust cover 30 on the testing table 111.

[0060] Furthermore, such as Figure 1 and Figure 2 As shown, the defect detection device also includes an illumination assembly, which comprises a first light source, a second light source, and a third light source. The first light source is located beside the first camera 121, and its light emission direction is downward. The first light source provides illumination for the first camera 121 to capture images of the end face of the first port of the dust cover 30. The second light source is located beside the second camera 122, and its light emission direction is horizontal. The illumination area of ​​the second light source covers the shooting area of ​​the second camera 122, and the second light source provides illumination for the second camera 122 to capture images of the outer peripheral surface of the dust cover 30.

[0061] like Figure 1 and Figure 2 As shown, the third light source is located at the center of the inspection platform 111, and its light emission direction is upward. The third light source is used to illuminate the interior of the dust cover 30 on the inspection platform 111. The first vision unit 12 also includes a fourth camera 123, which is located on the horizontal side of the inspection platform 111 away from the second light source. The fourth camera 123's shooting direction is horizontal, and its shooting area covers the space above the inspection platform 111. The coordinated operation and reasonable positional distribution of multiple light sources can provide illumination for the first camera 121 and the second camera 122, and reduce the impact of light on the light leakage detection of the fourth camera 123, thereby further improving the sufficiency of defect detection and ensuring the accuracy of defect detection at each location.

[0062] Furthermore, such as Figure 1 and Figure 2 As shown, the first vision unit 12 also includes a fifth camera 124; the shooting direction of the fifth camera 124 is tilted downward; the shooting area of ​​the fifth camera 124 covers the area above the detection stage 111; the lighting assembly also includes a fourth light source; the fourth light source is located beside the fifth camera 124; the lighting area of ​​the fourth light source covers the shooting area of ​​the fifth camera 124.

[0063] like Figure 1 and Figure 2 As shown, the fifth camera 124 takes a picture of the inner surface of the first port of the dust cover 30 from an angle that is tilted downward, thereby detecting whether there are defects such as burrs on the inner surface of the first port. The fourth light source provides illumination for the fifth camera 124 to take pictures.

[0064] Furthermore, such as Figure 1 and Figure 2 As shown, the positioning unit 11 also includes a second driving unit 112, which is connected to the detection stage 111. The second driving unit 112 can drive the detection stage 111 to rotate.

[0065] The inspection stage 111 drives the dust cover 30 to rotate, thereby meeting the shooting requirements of the first camera 121 and the second camera 122 for different positions of the dust cover 30, enabling the camera to capture images of the dust cover 30 at multiple rotation angles, thereby improving the integrity of the inspection.

[0066] Furthermore, such as Figure 1 and Figure 2 As shown, the first drive unit 212 can drive the clamping unit 211 to rotate and move up and down.

[0067] Because the diameter of the second port is large, the imaging effect of defects on the inner peripheral wall of the second port is different from different viewing angles. The clamping part 211 clamps the dust cover 30 and rotates it, which can capture images of the inner peripheral wall of the second port of the dust cover 30 at multiple rotation angles, thereby improving the reliability of the detection of the inner peripheral wall of the second port.

[0068] The first drive unit 212 drives the clamping unit 211 to rise and fall, enabling the clamping unit 211 to move the dust cover 30 to take pictures at different heights, thereby adapting to the detection requirements of different axial heights. When using the third camera 221 to photograph defects on the entire inner peripheral wall of the dust cover 30, when the axial dimension of the dust cover 30 is high, the second port of the dust cover 30 is controlled to face the third camera 221, and then the dust cover 30 is controlled to rise and fall intermittently. During the rising and falling intervals, images of the inner peripheral wall of the dust cover 30 are taken, thereby fully photographing and inspecting each area of ​​the inner peripheral wall.

[0069] In other embodiments, during the detection of the inner peripheral wall of the second port, the axis of the second port is eccentrically set with respect to the third camera 221, so that the inner peripheral wall of the second port can be imaged more clearly on the side farther away from the third camera 221. By rotating, each position of the inner peripheral wall of the second port can be rotated to the side farther away from the third camera 221 in sequence, so that each position can be imaged clearly.

[0070] Furthermore, such as Figure 2 and Figure 3 As shown, the second vision unit 22 also includes a sixth camera 222, which is positioned horizontally for shooting. The first drive unit 212 can drive the clamping unit 211 to move within the shooting area of ​​the sixth camera 222.

[0071] like Figure 1 and Figure 2As shown, the inspection station 111 may affect the inspection of the outer peripheral side near the second port, for example, due to obstruction of the shooting angle or shadows. This is especially true when the positioning groove of the positioning dust cover 30 is set on the inspection station 111, which will have a greater impact on the shooting. Therefore, a sixth camera 222 is added. The outer peripheral area of ​​the dust cover 30 captured by the second camera 122 and the sixth camera 222 partially overlaps, but with different focuses. The second camera 122 focuses on capturing the outer peripheral surface of the dust cover 30 near the first port, while the sixth camera 222 focuses on capturing the outer peripheral surface of the dust cover 30 near the second port, thereby improving the completeness of the outer peripheral defect detection.

[0072] In some embodiments, such as Figure 1 and Figure 2 As shown, the shooting directions of the second camera 122 and the sixth camera 222 are basically parallel; specifically, the angle between the shooting directions of the second camera 122 and the sixth camera 222 does not exceed 30°. This allows the second camera 122 and the sixth camera 222 to share a second light source, which can be a surface light source to improve the illumination area.

[0073] Furthermore, the defect detection device also includes a feeding assembly, which comprises a feeding conveying unit and a feeding gripping unit. The feeding gripping unit includes a gripping part and a third drive part, the third drive part being connected to the gripping part. The third drive part drives the gripping part to move between the feeding conveying unit and the detection table 111, and the first drive part 212 is capable of driving the clamping part 211 to move above the detection table 111.

[0074] In some embodiments, the feeding and conveying unit is a horizontally extending conveyor belt, with the end of the conveyor belt close to the inspection table 111. The conveyor belt has a lower cost and allows the end of the conveyor belt to be close to the inspection table 111, thereby shortening the transfer path of the product between the conveyor belt and the inspection table 111 and improving feeding efficiency.

[0075] In some embodiments, the feeding and conveying unit is a feeding robot, which has higher flexibility and can meet the testing and feeding needs of various production lines.

[0076] By configuring the feeding components, the order of inspection by the first inspection component 10 and the second inspection component 20 can be clearly defined. In use, the feeding gripping unit first picks up the dust cover 30 from the feeding conveyor unit and places it on the inspection table 111. After the first inspection component 10 completes its inspection of the dust cover 30 on the inspection table 111, the clamping unit 21 then picks up the dust cover 30 from the inspection table 111, allowing the second inspection component 20 to inspect it. Since defect detection at the first port is relatively quick, using the first inspection component 10 first allows for rapid screening of defective products at the first port, thus halting the inspection of the defective dust cover 30 and improving the efficiency of defect identification for the dust cover 30.

[0077] In some embodiments, when a defect is detected in a product, it can be immediately transferred to the non-conforming unloading area.

[0078] In some embodiments, when a defect is detected in a product, subsequent inspections can be carried out to fully detect multiple defects in the product and classify the degree or number of defects.

[0079] The working process of the defect detection device in this embodiment is as follows: First, the dust cover 30 on the feeding conveyor unit is picked up by the feeding gripping unit and placed on the detection table 111, with the first port of the dust cover 30 facing upwards and placed vertically. Then, the first camera 121 and the second camera 122 take images of the end face and outer peripheral face of the first port from above and horizontal directions, respectively, to perform the first defect detection. After the first defect detection is completed, the first driving unit 212 drives the clamping unit 211 to move above the detection table 111 and clamp the first port of the dust cover 30, so that the second port faces the third camera 221 for the second defect detection.

[0080] In other embodiments, such as Figure 2 As shown, the lighting assembly also includes a fifth light source, which emits light upwards and is located beside the third camera 221. The fifth light source can be used to provide auxiliary lighting for the third camera 221 during shooting. This ensures adequate illumination for the third camera 221 when shooting through the dust cover 30 port.

[0081] Example 2:

[0082] like Figure 2 and Figure 4 As shown, this embodiment provides a defect detection method applied to the defect detection device of Embodiment 1, used to detect appearance defects in a dust cover 30. This method divides the defect detection of the dust cover 30 into two stages: a first defect detection and a second defect detection. First, the first port end face and outer peripheral surface of the dust cover 30 are detected, and then the inner peripheral wall of the second port is detected. This reduces the number of posture adjustments required for the dust cover 30 and improves detection efficiency.

[0083] The defect detection method includes steps S10 to S30. Steps S10 to S30 are performed sequentially.

[0084] Step S10: Place the dust cover 30 vertically on the testing table 111, with the first port of the dust cover 30 facing upwards and the second port facing downwards; wherein the diameter of the first port is smaller than the diameter of the second port.

[0085] Step S20: Based on the fact that the dust cover 30 is located on the inspection table 111, perform the first defect inspection on the dust cover 30.

[0086] Step S30: Based on the completion of the first defect detection, perform a second defect detection on the dust cover 30.

[0087] Step S20 includes steps S21 to S24. In a preferred embodiment, steps S21 to S24 are performed sequentially.

[0088] Step S21: Take a first image of the first port of the dust cover 30. The first image is taken by the first camera 121.

[0089] Step S22: Determine whether the dust cover 30 has defects based on the first image. The first image can be used to determine whether there are missing materials or burrs on the small port end face.

[0090] Step S23: Take a second image of the outer peripheral surface of the dust cover 30. The second image is taken by the second camera 122.

[0091] Step S24: Determine whether the dust cover 30 has defects based on the second image. The second image can be used to determine whether there are wrinkles, tears, or differences in wave shape on the outer periphery of the dust cover 30.

[0092] It should be understood that in some other embodiments, the execution order of steps S21 and S23 may also be interchanged.

[0093] Step S30 includes steps S31 to S32. Steps S31 and S32 are executed sequentially.

[0094] Step S31: Take a third image of the second port of the dust cover 30.

[0095] Step S32: Determine whether the dust cover 30 has defects based on the third image. Determine whether there are defects such as bulges or bubbles on the inner peripheral wall of the second port based on the third image.

[0096] In this embodiment, the dust cover 30 is supported by the detection platform 111 so that it is placed vertically. The first port faces upward so that the first camera 121 can take pictures from above, and the second port faces downward so that the second detection component 20 can take pictures of the inner peripheral wall of the dust cover 30 from below.

[0097] This embodiment simplifies the positioning posture of the dust cover 30 during the first defect detection process and can take into account the defect detection at multiple locations of the small port, i.e., the first port. As a result, there are more types of detection methods. The end face and outer peripheral face of the first port are detected first, which can quickly screen out defective products and stop the subsequent detection of the defective dust cover 30, thereby improving the detection efficiency.

[0098] Step S20 also includes steps S25 to S29.

[0099] Step S25: Based on the completion of the first image capture, the interior of the dust cover 30 is illuminated, and a fourth image of the outer peripheral surface of the dust cover 30 is captured. The illumination inside the dust cover 30 is achieved through a third light source. The fourth image is captured by the fourth camera 123.

[0100] Step S26: Determine whether there is light leakage in the dust cover 30 based on the fourth image. It should be understood that the imaging effect of the fourth image can be used to determine whether to turn off other light sources that may affect the light leakage detection.

[0101] Step S27: Based on the completion of the fourth image capture, turn off the light source for the internal illumination of the dust cover 30.

[0102] Step S28: Take a fifth image of the inner peripheral wall of the first port. The fifth image is formed by the fifth camera 124 taking a picture of the inner peripheral wall of the first port from a downward tilting direction.

[0103] Step S29: Determine whether the dust cover 30 has defects based on the fifth image. The fifth image can be used to determine whether there are defects such as burrs on the inner surface of the first port.

[0104] In some embodiments, during the execution of steps S25 to S29, the internal illumination source is first turned on to perform light leakage detection. During the light leakage detection process, the dust cover 30 can be rotated to perform light leakage detection on the entire outer circumference of the dust cover 30. After the detection is completed, the light source is turned off before taking pictures of the inner peripheral wall of the first port, thereby avoiding light source interference and ensuring the detection accuracy of each step. When taking pictures of the inner peripheral wall of the first port, the dust cover 30 is rotated to clearly capture pictures of various positions of the inner peripheral wall of the first port.

[0105] In some embodiments, steps S28 and S23 are executed synchronously. During the synchronous execution, the dust cover 30 is controlled to rotate, thereby enabling simultaneous detection of the outer peripheral wall of the dust cover 30 and the inner peripheral wall of the small port.

[0106] Step S31 includes steps S311 to S313. Steps S311 to S313 are executed sequentially.

[0107] Step S311: Clamp the first port of the dust cover 30 and control the dust cover 30 to intermittently rise and fall in a vertical position. Drive the clamping part 211 to clamp the first port of the dust cover 30 through the first driving part 212, so that the second port faces the third camera 221, and control the dust cover 30 to intermittently rise and fall vertically.

[0108] Step S312: During the pauses between each intermittent raising and lowering of the dust cover 30, a sixth image of the inner peripheral wall of the dust cover 30 at multiple preset height positions is captured from the second port. When the axial dimension of the dust cover 30 is high, the dust cover 30 is brought to a standstill at different height positions through intermittent raising and lowering. The third camera 221 captures an image of the inner peripheral wall at that height position during each pause, thereby fully capturing and detecting each area of ​​the inner peripheral wall.

[0109] Step S313: Determine whether the dust cover 30 has defects based on the sixth image.

[0110] By capturing a sixth image at multiple height positions and combining it with the rotation of the clamping part 211 driven by the first drive unit 212, images of the inner peripheral wall of the second port of the dust cover 30 at multiple rotation angles and multiple height positions can be captured, thereby improving the reliability and completeness of the detection of the inner peripheral wall of the second port.

[0111] In some embodiments, step S30 further includes steps S33 to S34. Steps S33 to S34 are executed sequentially.

[0112] Step S33: Take a sixth image of the outer peripheral wall of the dust cover 30 near the second port. The sixth image is taken by the sixth camera 222.

[0113] Step S34: Determine whether the dust cover 30 has defects based on the sixth image. The sixth image can be used to determine whether the outer peripheral wall of the dust cover 30 has defects such as damage or differences in wavy shape.

[0114] In some embodiments, when capturing the sixth image, the dust cover 30 can be controlled to rotate intermittently, and the sixth image can be captured during the intervals between the intermittent stops, so as to fully capture and detect the entire outer peripheral wall of the dust cover 30.

[0115] In some embodiments, the order of steps S31 and S33 can be reversed.

[0116] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A defect detection device, characterized in that, The defect detection device includes: The first detection component includes a positioning unit and a first vision unit; the positioning unit includes a detection platform; the first vision unit includes a first camera and a second camera; the first camera is located above the detection platform; the first camera's shooting direction is downward; the second camera is located on a horizontal side of the detection platform; the second camera's shooting direction is horizontal; the shooting areas of both the first camera and the second camera cover the space above the detection platform. The second detection component includes a clamping unit and a second vision unit; the clamping unit includes a clamping part and a first driving part; the first driving part is connected to the clamping part; the second vision unit includes a third camera; the shooting direction of the third camera is vertically oriented; the first driving part can drive the clamping part to move within the shooting area of ​​the third camera.

2. The defect detection device according to claim 1, characterized in that, The defect detection device further includes an illumination assembly, which includes a first light source, a second light source, and a third light source; The first light source is located beside the first camera; the light emission direction of the first light source is downward; The second light source is located beside the second camera; the light emission direction of the second light source is horizontal; the illumination area of ​​the second light source covers the shooting area of ​​the second camera; The third light source is located at the center of the detection platform; the light emission direction of the third light source is upward. The first vision unit further includes a fourth camera; the fourth camera is located on the horizontal side of the detection platform away from the second light source; the shooting direction of the fourth camera is set horizontally; the shooting area of ​​the fourth camera covers the space above the detection platform.

3. The defect detection device according to claim 2, characterized in that, The first vision unit further includes a fifth camera; the fifth camera is positioned at an angle downwards; the shooting area of ​​the fifth camera covers the area above the detection platform. The lighting assembly also includes a fourth light source; the fourth light source is located beside the fifth camera; the illumination area of ​​the fourth light source covers the shooting area of ​​the fifth camera.

4. The defect detection device according to claim 1, characterized in that, The positioning unit further includes a second driving unit; the second driving unit is connected to the detection stage; the second driving unit is capable of driving the detection stage to rotate.

5. A defect detection device according to claim 1, characterized in that, The first driving unit is capable of driving the clamping unit to rotate and move up and down.

6. The defect detection device according to claim 1, characterized in that, The second vision unit further includes a sixth camera; the sixth camera is positioned horizontally; the first drive unit is capable of driving the clamping unit to move within the shooting area of ​​the sixth camera.

7. A defect detection device according to claim 1, characterized in that, The defect detection device further includes a feeding assembly, which includes a feeding conveying unit and a feeding gripping unit; the feeding gripping unit includes a gripping part and a third driving part; the third driving part is connected to the gripping part; the third driving part drives the gripping part to move between the feeding conveying unit and the detection table; The first driving unit can drive the clamping unit to move above the detection stage.

8. A defect detection method, applied to a defect detection device according to any one of claims 1-7; characterized in that, The defect detection method includes: The dust cover is placed vertically on the testing platform with its first port facing upwards and its second port facing downwards; wherein the diameter of the first port is smaller than the diameter of the second port. Based on the fact that the dust cover is located on the testing platform, the dust cover is subjected to a first defect detection; Based on the completion of the first defect detection, a second defect detection is performed on the dust cover; The first defect detection includes: Take a first image of the first port of the dust cover; Determine whether the dust cover has defects based on the first image; Take a second image of the outer peripheral surface of the dust cover; Determine whether the dust cover has defects based on the second image; The second defect detection includes: Take a third image of the second port of the dust cover; Determine whether the dust cover has defects based on the third image.

9. A defect detection method according to claim 8, characterized in that, The first defect detection also includes: Based on the completion of the first image capture, the inside of the dust cover is illuminated, and a fourth image of the outer peripheral surface of the dust cover is captured. Determine whether the dust cover leaks light based on the fourth image; Once the fourth image is captured, the light source for illuminating the inside of the dust cover is turned off. Take a fifth image of the inner peripheral wall of the first port; Determine whether the dust cover has defects based on the fifth image.

10. A defect detection method according to claim 9, characterized in that, The process of capturing a third image of the second port of the dust cover includes: Clamp the first port of the dust cover and control the dust cover to intermittently rise and fall in a vertical position; During the static intervals of each intermittent raising and lowering of the dust cover, a sixth image of the inner peripheral wall of the dust cover at multiple preset height positions is captured from the second port. Determine whether the dust cover has defects based on the sixth image.

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