A visual defect detection system

Abstract

This invention provides a visual defect detection system, comprising: a feeding mechanism, a housing assembly, a visual defect detection assembly, and a receiving assembly. The visual defect detection assembly includes a rotating device and a detection module. The detection module includes multiple detection stations, each used to detect external wall appearance defects, internal wall appearance defects, end face defects, and workpiece dimensions of the workpiece being transported on the rotating device. The external wall appearance defect detection station includes at least two lenses and two light sources, with the lenses arranged obliquely along the circumferential direction of the workpiece. The receiving assembly classifies and transports qualified and defective products according to the detection results. This visual defect detection system improves the efficiency of external wall appearance defect detection for workpieces with complex structures, reduces the number of detection devices required, lowers system costs, enables the visual defect detection system to operate at full capacity, and significantly improves detection quality and accuracy.

Description

Technical Field

[0001] This invention relates to the field of detection equipment technology, and in particular to a visual defect detection system. Background Technology

[0002] In the parts manufacturing industry, after a workpiece is processed, it needs to undergo multiple steps, including dimensional inspection, defect inspection, and performance testing, before it can be put into the market. In existing parts manufacturing plants, dimensional inspection is mostly done manually by inspectors using calipers, and defect inspection relies on quality inspectors to visually identify defects based on experience and standards. This process is inefficient and has a high error rate.

[0003] Defects or dimensional errors in automotive parts pose significant safety risks, leading to increasingly stringent requirements for dimensional and defect inspection among existing automotive parts manufacturers.

[0004] Existing dimensional and defect inspection machines on the market are mainly used to inspect workpieces with relatively simple structures. For automotive parts, such as the valve core and stem used in throttle valves, or the aluminum connecting pipes (workpiece 100) used in automotive thermal management systems, the structures are more complex, featuring holes, threads, chamfers, and various end faces of different sizes. Figures 1-2 As shown, the workpiece 100 includes structures such as an inner hole 100a, an end face 100b, a marking groove 100c, an arc-shaped outer shell section 100d, and a bevel 100e. Multiple angles of each end face, hole, chamfer, etc. are required to be free of defects. Relying solely on external dimensions and appearance defects for inspection cannot meet the quality inspection requirements.

[0005] Meanwhile, the manufacturing process of parts requires a certain quality inspection rate; the inspection speed cannot be too low. For example, the inspection speed should be 100 parts per minute, otherwise production efficiency cannot be met. In existing vision inspection systems, dimensional inspection and defect inspection are basically separated, which cannot meet the inspection speed requirements. In addition, a single light source cannot clearly capture the contours and edges of complex workpieces, and through-holes that are difficult to capture and inspect are prone to appear in the curved areas of the outer wall, which will also slightly reduce the inspection accuracy.

[0006] With high-speed quality inspection, how to achieve accurate detection of dimensions and various defects is a technical challenge that the industry urgently needs to solve. Summary of the Invention

[0007] In view of this, the present invention aims to propose a visual defect detection system to solve the technical problems of low detection efficiency and poor accuracy of automotive parts with high requirements for appearance and size defects in the prior art.

[0008] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0009] A visual defect detection system, comprising:

[0010] The feeding mechanism is used to transport the workpiece to the visual defect detection assembly for inspection.

[0011] The housing assembly is used to support and fix the visual defect detection assembly;

[0012] A visual defect detection assembly includes a rotary device and a detection module. The detection module is used to detect the outer wall appearance defects, inner wall appearance defects, end face defects, and workpiece dimensions of the workpiece being transported on the rotary device.

[0013] The detection module includes multiple detection stations, each corresponding to a set of detection devices. The detection devices include a camera, a lens, and a light source. The workpiece outer wall appearance defect detection station includes at least two lenses and two types of light sources. The lenses of the outer wall appearance defect detection station are arranged in an inclined manner in the circumferential direction of the workpiece.

[0014] The receiving component sorts and transports the workpieces into qualified and unqualified categories based on the detection results of the size and defects detected by the detection module.

[0015] Furthermore, the rotating device includes a perspective rotating support plate and a drive system. The perspective rotating support plate is used to perform top and bottom side imaging and inspection of the workpiece, and the drive system can drive the perspective rotating support plate to rotate.

[0016] Furthermore, the detection module includes an outer wall detection unit, which is set at the outer wall appearance defect detection station. The outer wall detection unit includes a fifth detection camera device, a sixth light source device, and a seventh light source device. The seventh light source device is a ring-shaped shadowless light source, and the sixth light source device is a white ordinary surface light source. The fifth detection camera device and the seventh light source device are set above the perspective rotating support plate, and the sixth light source device is set below the perspective rotating support plate.

[0017] Furthermore, the fifth inspection camera device includes a first support frame and a plurality of cameras. A first connecting device is provided on the first support frame and is positioned directly above the workpiece at the outer wall appearance defect inspection station. A second connecting device is provided at the lower end of the first connecting device, and the cameras are fixed to the circumferential direction of the workpiece at the outer wall appearance defect inspection station via the second connecting device.

[0018] Furthermore, the sixth light source device includes a second support frame, on which a light source assembly is disposed. A mask is disposed on the upper surface of the light source assembly. The mask is disposed in a surrounding manner directly below the workpiece at the outer wall appearance defect detection station. The mask is an annular opaque mask.

[0019] Furthermore, the white ordinary surface light emitted by the light source component of the sixth light source device is the backlight, and the distance between the upper surface of the sixth light source device and the workpiece is 8mm-30mm. The ring-shaped shadowless light emitted by the seventh light source device is the front light, and the distance between the lower surface of the seventh light source device and the workpiece is 40-100mm.

[0020] Furthermore, the rotating support disk for perspective is circular, and the detection module further includes an upper inner wall detection unit, a lower inner wall detection unit, a lower port detection unit, an upper port detection unit, and a dimension detection unit. The upper inner wall detection unit, lower inner wall detection unit, lower port detection unit, upper port detection unit, outer wall detection unit, and dimension detection unit form six detection stations in the circumferential direction of the rotating support disk for perspective, respectively for detecting defects in the upper inner wall, lower inner wall, lower port end face, upper port end face, outer wall appearance defects, and dimension defects of the workpiece. The lower port detection unit and / or the upper port detection unit includes a lens and two light sources, and the lower port detection unit and the upper port detection unit are used to detect end face defects and end face dimensions.

[0021] Furthermore, the upper inner wall detection unit, the lower inner wall detection unit, the upper port detection unit, and the size detection unit each include a detection camera and a light source structure. The detection camera and the light source structure in the above device are located on opposite upper and lower sides of the perspective rotating support plate. The lower port detection unit includes a detection camera and two light source structures, namely a ring-shaped shadowless light source and a collimated surface light source. The detection camera and the collimated surface light source in the device are set above the perspective rotating support plate, and the ring-shaped shadowless light source in the device is set below the perspective rotating support plate.

[0022] Furthermore, the receiving assembly includes a first receiving device, a second receiving device, and a third receiving device. A second photoelectric detection device is disposed between the first receiving device and the second receiving device. The second photoelectric detection device is used to detect whether the workpiece has passed through the collection station of the first receiving device. A third photoelectric detection device is disposed between the second receiving device and the third receiving device. The third photoelectric detection device is used to detect whether the workpiece has passed through the collection station of the second receiving device. The first receiving device, the second receiving device, and the third receiving device are respectively used to collect workpieces whose size and defect detection results are qualified, unqualified, and no detection information was detected.

[0023] Furthermore, the detection module includes six defect inspection stations: upper inner wall defect, lower inner wall defect, lower port end face, upper port end face, outer wall appearance defect, and dimensional defect. Correspondingly, upper inner wall inspection units, lower inner wall inspection units, lower port inspection units, upper port inspection units, outer wall inspection units, and dimensional inspection units are set up at each of the six defect inspection stations. The upper inner wall inspection unit is used to detect defects in the upper half of the workpiece's inner hole; the lower inner wall inspection unit is used to detect defects in the lower half of the workpiece's inner hole; the lower port inspection unit is used to detect defects on the lower hole end face of the workpiece and to measure the inner hole diameter; the upper port inspection unit is used to detect defects on the upper hole end face of the workpiece; the outer wall inspection unit is used to detect appearance defects on the outer wall of the workpiece; and the dimensional inspection unit is used to measure the outer wall diameter of the lower hole, the outer wall diameter at the marked groove, the maximum outer circle step diameter, and the workpiece height.

[0024] Compared with existing technologies, the visual defect detection system of the present invention has the following advantages:

[0025] (1) The visual defect detection system of the present invention improves the efficiency of detecting external wall appearance defects for workpieces with complex structures, reduces the number of detection devices, reduces system costs, enables the visual defect detection system to operate at full load, and greatly improves detection quality and accuracy.

[0026] (2) The visual defect detection system described in this invention performs intelligent assembly line work for workpiece quality inspection during use. It breaks down the defect detection of workpieces into multiple workstations, such as 360° shooting of the outer wall, upper and lower parts of the inner wall, and end face. Therefore, it can capture each part of the workpiece clearly. Combined with the corresponding light source, it can achieve more accurate defect and size detection. Moreover, with the rotation of the perspective rotating support plate, it can achieve a speed of 100 pieces per minute or even higher, which improves detection efficiency, reduces human error in detection, and ensures the accuracy of quality inspection. Attached Figure Description

[0027] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0028] Figure 1 This is a side view of the workpiece being inspected according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic cross-sectional view of the workpiece to be inspected according to an embodiment of the present invention;

[0030] Figure 3 This is a frontal view of the visual defect detection system described in an embodiment of the present invention.

[0031] Figure 4 This is a side view structural diagram of the visual defect detection system described in an embodiment of the present invention;

[0032] Figure 5 This is a front view structural diagram of the visual defect detection assembly and the housing assembly according to an embodiment of the present invention;

[0033] Figure 6 for Figure 5 A top view of the structure shown in the diagram;

[0034] Figure 7 for Figure 5 A side view of the structure shown in the diagram;

[0035] Figure 8 for Figure 5 A side view of the structure shown in the diagram from a second perspective;

[0036] Figure 9 for Figure 5 A schematic diagram of the exploded structure shown in the figure;

[0037] Figure 10 This is a side view of the assembly structure of the fifth detection camera device and the seventh light source device according to an embodiment of the present invention;

[0038] Figure 11 for Figure 10 Top view of the structure of the middle section;

[0039] Figure 12 This is a side view of the sixth light source device according to an embodiment of the present invention;

[0040] Figure 13 This is a schematic diagram of the workflow of the visual defect detection system according to an embodiment of the present invention;

[0041] Figure 14 This is a diagram of the detection interface of the visual defect detection system described in an embodiment of the present invention;

[0042] Figure 15 This is a schematic photograph of the bottom of the workpiece without a mask at the outer wall appearance defect detection station according to an embodiment of the present invention;

[0043] Figure 16 This is a schematic photograph of a workpiece with a mask set at the bottom of the external appearance defect detection station as described in an embodiment of the present invention;

[0044] Figure 17 This is a schematic diagram of an external appearance defect photograph detected at the external appearance defect detection station of a workpiece according to an embodiment of the present invention;

[0045] Figure 18This is a schematic diagram of a visual photograph taken under a single ring light in the detection device for detecting workpieces at the lower port station according to an embodiment of the present invention.

[0046] Figure 19 This is a schematic diagram of a visual photograph taken under single backlighting for the detection device of the workpiece at the lower port station in an embodiment of the present invention.

[0047] Figure 20 This is a schematic diagram of a visual photograph taken under ring light combined with backlighting in an embodiment of the present invention for detecting workpieces at the lower port station.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100-Workpiece to be inspected; 100a-Inner hole; 100b-End face; 100c-Marking groove; 100d-Arc-shaped outer shell section; 100e-Bevel; 1-Feeding mechanism; 2-Vibration mechanism; 201-Feeding guide groove; 3-Box assembly; 4-Dust cover; 401-Inlet / outlet; 5-Visual defect inspection assembly; 501-Rotation device; 50101-Perspective rotary support plate; 50102-Drive system; 502-Upper inner wall inspection unit; 50201-First inspection camera device; 50202- First light source device; 503-Lower inner wall detection unit; 50301-Second light source device; 50302-Second detection camera device; 504-Lower port detection unit; 50401-Third detection camera device; 50402-Third light source device; 50403-Fourth light source device; 505-Upper port detection unit; 50501-Fifth light source device; 50502-Fourth detection camera device; 506-Outer wall detection unit; 50601-Fifth detection camera device; 506011-First branch Support frame; 506012-First connecting device; 506013-Camera; 506014-Second connecting device; 5060141-First connector; 5060142-First connecting rod; 5060143-Second connecting rod; 5060144-Second connector; 50602-Sixth light source device; 506021-Second support frame; 506022-Light source assembly; 506023-Mask; 50603-Seventh light source device; 507-Dimensional detection unit; 50701 - Sixth detection camera device; 50702- Eighth light source device; 508- Receiving assembly; 5081- First receiving device; 5082- Second receiving device; 5083- Third receiving device; 5084- Second photoelectric detection device; 5085- Third photoelectric detection device; 509- First guiding assembly; 5091- Guide wheel; 5010- First photoelectric detection device; 5011- Support assembly; 501101- First support device; 501102- Second support device; 5012- Platform. Detailed Implementation

[0050] To make the technical means and objectives and effects of the present invention easier to understand, the embodiments of the present invention will be described in detail below with reference to specific illustrations.

[0051] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., 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.

[0052] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Example 1

[0055] like Figures 1-14 As shown, this invention discloses a visual defect detection system, comprising:

[0056] The feeding mechanism 1 is used to transport the workpiece 100 to the visual defect detection assembly 5 for inspection.

[0057] Housing assembly 3 is used to support and fix the visual defect detection assembly 5;

[0058] The visual defect detection assembly 5 includes a rotary device 501 and a detection module. The detection module is used to detect the outer wall appearance defects, inner wall appearance defects, end face defects, and workpiece dimensions of the workpiece 100 transported on the rotary device 501.

[0059] The detection module includes multiple detection stations, each corresponding to a set of detection devices. The detection devices include a camera, a lens, and a light source. The outer wall appearance defect detection station of the workpiece 100 includes at least two lenses and two types of light sources. The lenses of the outer wall appearance defect detection station are arranged in an inclined manner in the circumferential direction of the workpiece 100.

[0060] The receiving component 508 sorts and transports the workpieces 100 into qualified and unqualified categories based on the detection results of the size and defects detected by the detection module.

[0061] This invention discloses a visual defect detection system, which designs an automated quality inspection system for complex workpieces 100 based on visual inspection. The workpiece 100 includes at least several structures such as an inner hole 100a, an end face 100b, an arc-shaped outer shell section 100d, a marking groove 100c, and a bevel 100e. Multiple of each structure can be provided. A feeding mechanism 1 enables the automated feeding of the workpiece 100 onto a rotary device 501 on the visual defect detection assembly 5. During rotation or movement, the workpiece 100 on the rotary device 501 is positioned by a workpiece movement or rotation auxiliary positioning component. The detection module located on the outer side of the conveying structure is then transported via the rotary device 501. The detection module performs defect detection on the outer wall appearance defects, inner wall appearance defects, end face defects, end face diameter, step diameter, and workpiece height of the workpiece 100. The detection module is fixed relative to the box assembly 3. During the rotation or movement of the workpiece 100 on the rotary device 501, the workpiece 100 passes through different detection stations in the detection module to detect the outer wall appearance defects, inner wall appearance defects, end face defects, and workpiece dimensions. Multiple workpieces are detected sequentially as the rotary device 501 moves or rotates, thereby realizing automated and intelligent detection of the workpiece 100. The detection module integrates dimension detection and defect detection into a single detection process, improving detection efficiency and ensuring detection accuracy. Furthermore, since workpiece 100 is a tubular structure with a large diameter in the middle and small diameter at both ends, to ensure the detection accuracy of the inspection module at different stations, a camera, lens, and light source are installed at each inspection station. However, when inspecting the appearance defects of the outer wall of this tubular structure, dividing the defect detection into two stations or rotating the inspection station relative to the inspection camera after gripping it would reduce the detection efficiency of the workpiece defects. This would result in the number of workpiece defects detected per minute not meeting production needs, leading to a decrease in production capacity. In addition, using a ring light source or a single backlight source for photographic inspection of the appearance defects of the outer wall, such as... Figure 15as well as Figure 17 As shown, defects such as tool marks, clamping marks, scratches, and dents on the outer wall of the workpiece have poor display accuracy, especially in the arc-shaped area of ​​the outer wall, where penetrating damage is difficult to detect using conventional methods. This application creatively sets up two light sources and at least two cameras 506013 at the outer wall appearance defect detection station. The two light sources serve as detection light sources for the outer wall appearance defects, ensuring that the straight cylindrical part, stepped part, and arc-shaped part of the outer wall of the workpiece 100 can be clearly captured, achieving reliable detection of outer wall appearance defects. Simultaneously, the setup of at least two cameras 506013 allows for the overall detection of outer wall appearance defects of the workpiece 100 through a single detection station, improving detection efficiency and enabling the visual defect detection system to meet production needs.

[0062] The visual defect detection system disclosed in this invention improves the efficiency of detecting external wall appearance defects for workpieces 100 with complex structures, reduces the number of detection devices required, lowers system costs, enables the visual defect detection system to operate at full capacity, and significantly improves detection quality and accuracy.

[0063] As a preferred example of the present invention, the rotating device 501 includes a perspective rotating support plate 50101 and a driving system 50102. The perspective rotating support plate 50101 is used to perform top and bottom side imaging and inspection of the workpiece 100, and the driving system 50102 can drive the perspective rotating support plate 50101 to rotate.

[0064] This setup, by setting the rotating support plate 50101 that drives the workpiece 100 as a perspective turntable, can divide the inner wall and end face of the workpiece 100 into upper and lower parts for imaging, so that all parts of the workpiece 100 can be clearly imaged, improving the accuracy of workpiece 100 size and defect detection.

[0065] As a preferred example of the present invention, the detection module includes an outer wall detection unit 506, which is disposed at the outer wall appearance defect detection station. The outer wall detection unit 506 includes a fifth detection camera device 50601, a sixth light source device 50602, and a seventh light source device 50603. The seventh light source device 50603 is a ring-shaped shadowless light source, and the sixth light source device 50602 is a white ordinary surface light source. The fifth detection camera device 50601 and the seventh light source device 50603 are ring-shaped shadowless light sources disposed above the perspective rotating support plate 50101, and the sixth light source device 50602 is disposed below the perspective rotating support plate 50101. Preferably, the fifth inspection camera device 50601 includes a first support frame 506011 and a plurality of shooting cameras 506013. A first connecting device 506012 is provided on the first support frame 506011. The first connecting device 506012 is located directly above the workpiece 100 at the outer wall appearance defect inspection station. A second connecting device 506014 is provided at the lower end of the first connecting device 506012. The shooting cameras 506013 are fixed in the circumferential direction of the workpiece 100 at the outer wall appearance defect inspection station through the second connecting device 506014. Specifically, as a preferred example of this application, four cameras 506013 are provided. The second connecting device 506014 includes a first connecting member 5060141, which is disposed at the lower end of the first connecting device 506012. The first connecting member 5060141 is rectangular or frustum-shaped. Four sets of connecting rod devices are evenly distributed in the circumferential direction of the first connecting member 5060141. A second connecting member 5060144 is provided at the end of each connecting rod device away from the first connecting member 5060141. The side of the second connecting member 5060144 facing the central axis of the workpiece 100 is an inclined surface. A camera 506013 is fixed on the inclined surface of each second connecting member 5060144. Preferably, the connecting rod device includes a first connecting rod 5060142 and a second connecting rod 5060143, wherein the first connecting rod 5060142 and the second connecting rod 5060143 are arranged perpendicularly, one end of the first connecting rod 5060142 is connected to the first connecting member 5060141, and one end of the second connecting rod 5060143 is connected to the second connecting member 5060144.

[0066] This configuration allows the outer wall inspection unit 506 of the outer wall appearance defect inspection station to include four cameras 506013. These four cameras 506013 are arranged in a crisscross pattern above the outer wall appearance defect inspection station. By tilting the cameras 506013, 360° imaging and inspection of the outer wall appearance defects of the workpiece 100 can be achieved without rotating the workpiece 100. This ensures that the visual defect inspection system described in this invention operates continuously at a predetermined speed without reducing the rotation speed of the perspective rotating support disk 50101, thus improving inspection efficiency. Simultaneously, this inspection station employs two light sources—a white ordinary surface light source and a ring-shaped shadowless light source. The ring-shaped shadowless light source is positioned above the workpiece 100, and the white ordinary surface light source is positioned below the workpiece 100, further improving the accuracy of the lens imaging in the outer wall appearance defect inspection station's inspection device. Figure 17 As shown, it can clearly capture and detect defects such as knife marks, pinch marks, scratches, and bumps on the outer wall, ensuring the accuracy of the detection of defects in the outer wall appearance.

[0067] As a preferred example of the present invention, the sixth light source device 50602 includes a second support frame 506021, a light source assembly 506022 is disposed on the second support frame 506021, and a mask 506023 is disposed on the upper surface of the light source assembly 506022. The mask 506023 is disposed in a surrounding manner directly below the workpiece 100 at the outer wall appearance defect detection station. Preferably, the mask 506023 is an annular opaque mask; as an example, the mask 506023 is a black mask.

[0068] Because workpiece 100 has a relatively complex structure, when no shield 506023 is placed directly below workpiece 100 at the outer wall appearance defect inspection station, the captured image is as follows: Figure 15 As shown, the image emits white light in the arc-shaped area (which is also the key area of ​​user attention and the area that is difficult to detect by conventional methods), making it impossible to clearly identify defects. However, by adding an opaque mask around the workpiece 100 at the station on the upper surface of a normal light source, the arc-shaped area of ​​the workpiece 100 can also be clearly imaged, improving the detection accuracy of external wall appearance defects.

[0069] As a preferred example of the present invention, the white ordinary surface light emitted by the light source component 506022 of the sixth light source device 50602 is backlight, and the distance between the upper surface of the sixth light source device 50602 and the workpiece 100 is 8mm-30mm. The ring-shaped shadowless light emitted by the seventh light source device 50603 is front light, and the distance between the lower surface of the seventh light source device 50603 and the workpiece 100 is 40-100mm. As an example of the present invention, the shooting camera 506013 in the fifth detection camera device 50601 is tilted at an angle. Preferably, the angle between the shooting direction of the shooting camera 506013 and the vertical direction is α, and the value of α ranges from 15° to 30°. As an example, the lower end of the workpiece 100 is about 205mm away from the lens of the shooting camera 506013, the projection distance is about 200mm, and the vertical height is 50mm.

[0070] This setup avoids interference between the two light sources when the lens at the exterior defect inspection station is capturing images, further improving the accuracy and reliability of the images.

[0071] As a preferred example of the present invention, the perspective rotary support disk 50101 is circularly arranged. The detection module further includes an upper inner wall detection unit 502, a lower inner wall detection unit 503, a lower port detection unit 504, an upper port detection unit 505, and a size detection unit 507. The upper inner wall detection unit 502, the lower inner wall detection unit 503, the lower port detection unit 504, the upper port detection unit 505, the outer wall detection unit 506, and the size detection unit 507 form six detection stations in the circumferential direction of the perspective rotary support disk 50101, which are respectively used for detecting upper inner wall defects, lower inner wall defects, lower port end face, upper port end face, outer wall appearance defects, and size defects of the workpiece 100. The lower port detection unit 504 and / or the upper port detection unit 505 include a lens and two light sources. The end face detection station is used to detect end face defects and end face dimensions.

[0072] This setup, combined with the viewing turntable in the rotating device 501, utilizes a ring light source or a single backlight source for photographic inspection of end-face defects and dimensions of the pipe fitting, since the lower flange diameter of the workpiece 100 is relatively large. Figure 18 , Figure 19 As shown, the display accuracy of defects such as scratches on the inner wall or end face of the workpiece is poor. This application creatively sets two light sources at the end face inspection station as detection light sources for end face defects and dimensions, enabling clear imaging of the inner circle, outer circle, and edge of the workpiece 100 end, while simultaneously achieving reliable detection of end face dimensions and defects. The visual inspection photographs are shown below. Figure 20 As shown.

[0073] As a preferred example of the present invention, the upper inner wall detection unit 502, the lower inner wall detection unit 503, the lower port detection unit 504, the upper port detection unit 505, the outer wall detection unit 506, and the size detection unit 507 are arbitrarily arranged in the circumferential direction of the rotary device 501.

[0074] This configuration further expands the application scenarios for the visual defect detection system described in this invention and improves the reliability of the visual defect detection system described in this invention.

[0075] As a preferred example of the present invention, the upper inner wall detection unit 502, the lower inner wall detection unit 503, the upper port detection unit 505, and the size detection unit 507 each include a detection camera and a light source structure. The detection camera and the light source structure in the above-mentioned device are located on opposite upper and lower sides of the perspective rotating support plate 50101. The lower port detection unit 504 includes a detection camera and two light source structures, namely an annular shadowless light source and a collimating surface light source. The detection camera and the collimating surface light source in the device are arranged above the perspective rotating support plate 50101, and the annular shadowless light source in the device is arranged below the perspective rotating support plate 50101. As an example of the present invention, the upper inner wall detection unit 502 includes a first detection camera device 50201 and a first light source device 50202; the lower inner wall detection unit 503 includes a second light source device 50301 and a second detection camera device 50302; the lower port detection unit 504 includes a third detection camera device 50401, a third light source device 50402, and a fourth light source device 50403; the upper port detection unit 505 includes a fifth light source device 50501 and a fourth detection camera device 50502; and the size detection unit 507 includes a sixth detection camera device 50203. 701 and the eighth light source device 50702, wherein the first detection camera device 50201, the second light source device 50301, the third detection camera device 50401, the fourth light source device 50403, the fifth light source device 50501, the sixth detection camera device 50701 and the eighth light source device 50702 are disposed above the perspective rotating support plate 50101, and the first light source device 50202, the second detection camera device 50302 and the third light source device 50402 are disposed below the perspective rotating support plate 50101. Preferably, the cameras in the first detection camera device 50201 and the second detection camera device 50302 are 360° detection cameras, such as the commercially available MV-CAO50-12UC 500w monochrome camera, with an AZURE-C50-KY 360° inner wall lens. The cameras in the third detection camera device 50401 and the sixth detection camera device 50701 are telecentric lens cameras, such as the commercially available MV-CH250-90UC 2500w monochrome camera, with an AZURE-DT70M10M telecentric lens. The cameras in the fourth detection camera device 50502 and the fifth detection camera device 50601 are extension tube lens cameras. The first light source device 50202 and the second light source device 50301 are white ordinary surface light sources, and the fourth light source device 50403 and the eighth light source device 50702 are collimated surface light sources.The third light source device 50402 and the fifth light source device 50501 are ring-shaped shadowless light sources. The white ordinary surface light source in each light source device is a commercially available model VLBGLXD185X185V-24V, the collimating surface light source is a commercially available model VLPXBGSD50X50B-DR-24V, and the ring-shaped shadowless light source is a commercially available model VLHPDD70R1V-24V. The white ordinary surface light emitted by the first light source device 50202 is a backlight. The working distance between the first light source device 50202 and the workpiece 100 is 8mm to 30mm, and the working distance between the lens of the first detection camera device 50201 and the workpiece 100 is 7mm to 9mm. The white ordinary surface light emitted by the second light source device 50301 is a backlight. The working distance between the second light source device 50301 and the workpiece 100 is 8mm to 30mm, and the working distance between the lens of the second detection camera device 50302 and the workpiece 100 is 7mm to 9mm. 9mm; the ring-shaped shadowless light emitted by the third light source device 50402 is the front light, and the working distance between the third light source device 50402 and the workpiece 100 is 5.5mm to 60mm; the collimated front light emitted by the fourth light source device 50403 is the back light, and the working distance between the fourth light source device 50403 and the workpiece 100 is 8mm to 30mm; the working distance between the lens of the third detection camera device 50401 and the workpiece 100 is 75.5mm; the fifth light source device The ring-shaped shadowless light emitted by the fifth light source device 50501 is the front light. The working distance between the fifth light source device 50501 and the workpiece 100 is 5.5mm to 60mm. The working distance between the lens of the fourth detection camera device 50502 and the workpiece 100 is 200mm. The collimated surface light emitted by the eighth light source device 50702 is the back light. The working distance between the eighth light source device 50702 and the workpiece 100 is 194mm. The lower edge surface of the back light is approximately flush with the bottom height of the workpiece 100.

[0076] This setup, by reasonably limiting the installation distance and model of the detection devices at the six detection stations relative to the workpiece 100 in the visual defect detection system disclosed in this invention, reduces system costs, enhances the clarity of the images captured by the detection module at each station of the workpiece 100, and further improves the accuracy of quality inspection.

[0077] As a preferred example of the present invention, at least two of the first detection camera device 50201, the second light source device 50301, the third detection camera device 50401, the fourth light source device 50403, the fifth light source device 50501, the fifth detection camera device 50601, the seventh light source device 50603, the sixth detection camera device 50701, and the eighth light source device 50702 are integrated on the support assembly 5011. As an example of the present invention, the support assembly 5011 includes a first support device 501101 and a second support device 501102. The first detection camera device 50201 and the second light source device 50301 are integrated on the upper plate of the first support device 501101. The third detection camera device 50401, the fourth light source device 50403, the fifth light source device 50501, the fifth detection camera device 50601, and the seventh light source device 50603 are integrated on the upper plate of the second support device 501102. The first support device 501101 and the second support device 501102 are fixed on the platform 5012.

[0078] This configuration integrates multiple detection devices in the detection module, which facilitates the integrated assembly and fixation of the visual defect detection assembly 5, improves assembly efficiency, and also ensures the reliability of the visual defect detection system described in this invention.

[0079] As a preferred example of the present invention, a first guiding component 509 is provided on the perspective rotary support disk 50101. The first guiding component 509 is used to guide the workpiece 100 of the feeding mechanism 1 into the visual defect detection assembly 5 to a preset position on the perspective rotary support disk 50101, so that the workpiece 100 enters different stations of the detection module for photographic detection in sequence as it rotates on the perspective rotary support disk 50101. Specifically, the first guiding component 509 includes a guide wheel 5091, which is disposed above the perspective rotary support disk 50101. This allows the workpiece 100 on the perspective rotary support disk 50101 to be guided by the guide wheel as it rotates along with the perspective rotary support disk 50101. The workpiece 100 moves to the preset position as the perspective rotary support disk 50101 rotates, and then the workpiece 100 rotates circumferentially along with the perspective rotary support disk 50101, entering different stations of the detection module in sequence.

[0080] This ingenious design allows for the accurate and efficient pushing of the workpiece 100 on the rotating support plate 50101 to the corresponding position, facilitating precise detection of the workpiece 100's dimensions and defects by cameras at different workstations of the detection module during rotation. This further enhances the reliability of the visual defect detection system described in this invention.

[0081] As a preferred example of the present invention, a rotary vibration mechanism 2 is provided between the feeding mechanism 1 and the visual defect detection assembly 5. The rotary vibration mechanism 2 includes a feeding guide groove 201. The rotary vibration mechanism 2 transmits the workpiece 100 fed by the feeding mechanism 1 to the perspective rotary support disk 50101 in sequence through the feeding guide groove 201.

[0082] The rotation mechanism 2 adjusts the orientation of the workpiece 100 before it is transferred to the perspective rotary support plate 50101, ensuring the reliability of the workpiece 100 being automatically placed on the perspective rotary support plate 50101 and the consistency for the detection module to perform accurate detection, thereby improving the efficiency and accuracy of the workpiece 100 quality inspection.

[0083] As a preferred example of the present invention, a first photoelectric detection device 5010 is provided between the first material guiding component 509 and the detection module. The first photoelectric detection device 5010 is used to detect whether the workpiece 100 passes through a predetermined position. As a specific example of the present invention, the first photoelectric detection device 5010 includes an infrared signal transmitter and a receiver. When the workpiece 100 on the perspective rotary support plate 50101 passes through the area of ​​the first photoelectric detection device 5010, the receiver in the first photoelectric detection device 5010 can no longer receive the signal emitted by the infrared signal transmitter, thereby determining whether there is a workpiece 100 to enter the detection module for detection, thus realizing the reliability of precise and automated quality detection of the workpiece 100 when it enters the detection module.

[0084] As a preferred example of the present invention, the receiving assembly 508 includes a first receiving device 5081, a second receiving device 5082, and a third receiving device 5083. A second photoelectric detection device 5084 is disposed between the first receiving device 5081 and the second receiving device 5082. The second photoelectric detection device 5084 is used to detect whether the workpiece 100 has passed the collection station of the first receiving device 5081. A third photoelectric detection device 5085 is disposed between the second receiving device 5082 and the third receiving device 5083. The third photoelectric detection device 5085 is used to detect whether the workpiece 100 has passed the collection station of the second receiving device 5082. The first receiving device 5081, the second receiving device 5082, and the third receiving device 5083 are respectively used to collect workpieces 100 whose size and defect detection results are qualified, unqualified, and no detection information was detected.

[0085] As an example of the present invention, the third receiving device 5083 is used to collect workpieces 100 for which no detection information was found, and the third receiving device 5083 is connected to the feeding mechanism 1 and / or the rotary vibration mechanism 2.

[0086] The receiving component 508 described in this application includes three collection bins, which are respectively used to collect workpieces 100 whose size and defect detection results are qualified, unqualified, and no detection information. If the workpiece 100 detected by the detection module is a qualified product without defects, it is blown into the qualified bin by the air blowing component. If the workpiece 100 detected by the detection module is an unqualified product with defects, it is blown into the unqualified bin by the air blowing component. One of the first receiving device 5081 and the second receiving device 5082 is the qualified bin, and the other is the unqualified bin. If no data is detected for the workpiece 100, it is introduced into the third receiving device 5083 through the second guiding component or the air blowing component. The third receiving device 5083 is a spare bin. The workpiece 100 entering the third receiving device 5083 is transferred to the feeding mechanism 1 and / or the rotary vibration mechanism 2 for re-inspection.

[0087] This setting further enhances the intelligent assembly line operation of the visual defect detection system described in this invention for quality inspection of workpiece 100 during use. By adjusting the rotation speed of the perspective rotary support plate 50101, it is possible to achieve an efficiency of inspecting 100 workpieces 100 per minute. Furthermore, by adjusting to a higher speed, the inspection efficiency can be improved, human error in inspection can be reduced, and the accuracy of quality inspection can be guaranteed.

[0088] As a preferred example of the present invention, a dust cover 4 is provided above the housing assembly 3. The dust cover 4 covers the outside of the visual defect detection assembly 5. An inlet / outlet 401 is provided at one end of the dust cover 4. The inlet / outlet 401 is used for the workpiece 100 to enter the visual defect detection assembly 5 for detection and for classifying and outputting the workpiece 100 after detection by the visual defect detection assembly 5.

[0089] This design prevents dust or foreign objects from entering the visual defect detection assembly 5 and interfering with the quality inspection of the workpiece 100, thereby further improving the accuracy and reliability of the visual defect detection system described in this invention.

[0090] As a preferred example of the present invention, such as Figure 14 As shown, the visual defect detection system also includes an interface display unit. The interface display unit displays the data or image information of the outer wall appearance defects, inner wall appearance defects, end face defects, end face diameter, circle diameter at the step, and workpiece height of the workpiece 100 detected and collected by the detection module, and outputs information such as running time, running speed, total number, number of good products, pass rate, and number of defective products.

[0091] As a preferred example of the present invention, the detection module of the visual defect detection system includes six defect inspection stations: upper inner wall defect, lower inner wall defect, lower port end face, upper port end face, outer wall appearance defect, and dimensional defect. At each of the six defect inspection stations, an upper inner wall detection unit 502, a lower inner wall detection unit 503, a lower port detection unit 504, an upper port detection unit 505, an outer wall detection unit 506, and a dimensional detection unit 507 are correspondingly arranged. The upper inner wall detection unit 502 is used to detect defects in the upper half of the workpiece's inner hole; the lower inner wall detection unit 503 is used to detect defects in the lower half of the workpiece's inner hole; the lower port detection unit 504 is used to detect defects on the lower hole end face of the workpiece and to measure the inner hole diameter; the upper port detection unit 505 is used to detect defects on the upper hole end face of the workpiece; the outer wall detection unit 506 is used to detect appearance defects on the outer wall of the workpiece; and the dimensional detection unit 507 is used to measure the outer wall diameter of the lower hole, the outer wall diameter at the marked groove, the maximum outer diameter of the outer circle step, and the workpiece height. The visual defect detection system performs the following detection method:

[0092] S1: Manually pour workpiece 100 into the feeding conveyor belt, press the run button on the equipment, the feeding conveyor belt guides workpiece 100 into the vibratory plate of the rotary vibration mechanism 2, the vibratory plate automatically feeds, and at the same time the perspective rotary support plate 50101 runs and rotates.

[0093] S2: The workpiece 100 passes through the feeding guide groove 201 of the vibratory feeder and arrives at the perspective rotary support plate 50101. The position of the workpiece 100 on the perspective rotary support plate 50101 is adjusted by the first feeding guide component 509.

[0094] S3: When workpiece 100 passes the upper inner wall defect station, the camera in the first detection camera device 50201 takes a picture of the upper half of the inner hole of the workpiece and completes the inner hole defect detection.

[0095] S4: When workpiece 100 passes the lower inner wall defect station, the camera in the second detection camera device 50302 takes a picture of the lower half of the inner hole of the workpiece and completes the inner hole defect detection.

[0096] S5: When workpiece 100 passes the lower end face station, the camera in the third detection camera device 50401 takes a picture of the lower end face of the workpiece and completes the lower end face defect detection and inner hole diameter measurement.

[0097] S6: When workpiece 100 passes the upper end face station, the camera in the fourth detection camera device 50502 takes a picture of the upper end face of the workpiece and completes the upper end face defect detection.

[0098] S7: When workpiece 100 passes through the outer wall appearance defect station, the four cameras in the fifth inspection camera device 50601 simultaneously take pictures of the outer wall and complete the outer wall appearance defect inspection.

[0099] S8: When workpiece 100 passes through the dimensional defect station, the camera in the sixth inspection camera device 50701 takes a picture of the overall projection of the workpiece and completes a total of 4 dimensional measurements, including the outer wall diameter of the lower hole, the outer wall diameter at the marking groove, the maximum outer circle step diameter, and the workpiece height.

[0100] S9: After the last station completes the inspection, count the number of the workpieces and obtain the inspection results. Based on the inspection results, the product is discharged when it reaches the corresponding discharge position.

[0101] After size and defect inspection is completed, the materials are sorted and sent to the corresponding receiving device in receiving assembly 508, specifically as follows:

[0102] If there are no defects, it is considered a qualified product and is blown into the qualified chamber by the air blowing component;

[0103] If any defect occurs, the product is considered defective and will be blown into the defective compartment by the air blowing assembly;

[0104] If no data is detected, it is blown into the spare chamber, which is connected to the feeding unit, and is re-detected with the new workpiece.

[0105] The visual defect detection system of the present invention breaks down the defect detection of workpiece 100 into multiple station detections, including 360° imaging of the outer wall, upper and lower parts of the inner wall, and end face. Therefore, it can capture each part of the workpiece clearly. Combined with the corresponding light source, it can achieve relatively accurate defect and size detection. Moreover, with the rotation of the perspective rotating support plate 50101, it can achieve a speed of 100 pieces per minute or even higher.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A visual defect detection system, characterized in that, include: The feeding mechanism (1) is used to transport the workpiece (100) to the visual defect detection assembly (5) for inspection; The workpiece (100) is a tubular structure with a large diameter in the middle and small diameter at both ends, including an inner hole (100a), an end face (100b), an arc-shaped outer shell section (100d), a marking groove (100c), and a bevel (100e). The housing assembly (3) is used to support and fix the visual defect detection assembly (5); The visual defect detection assembly (5) includes a rotating device (501) and a detection module. The rotating device (501) includes a perspective rotating support plate (50101) and a drive system (50102). The perspective rotating support plate (50101) is used to perform top and bottom side imaging detection on the workpiece (100). The drive system (50102) can drive the perspective rotating support plate (50101) to rotate. The detection module is used to detect the outer wall appearance defects, inner wall appearance defects, end face defects, and workpiece dimensions of the workpiece (100) transported on the rotating device (501). The detection module includes multiple detection stations, each detection station corresponds to a set of detection devices, and the detection devices include a camera, a lens and a light source. The outer wall appearance defect detection station of the workpiece (100) includes at least two lenses and two kinds of light sources. The lenses of the outer wall appearance defect detection station are arranged in an inclined manner in the circumferential direction of the workpiece (100). The detection module includes an outer wall detection unit (506), which is set at the outer wall appearance defect detection station. It includes a fifth detection camera device (50601), a sixth light source device (50602), and a seventh light source device (50603). The fifth detection camera device (50601) and the seventh light source device (50603) are set above the perspective rotating support plate (50101), and the sixth light source device (50602) is set below the perspective rotating support plate (50101). The fifth inspection camera device (50601) includes a first support frame (506011) and a plurality of cameras (506013). A first connecting device (506012) is provided on the first support frame (506011). The first connecting device (506012) is located directly above the workpiece (100) at the outer wall appearance defect inspection station. A second connecting device (506014) is provided at the lower end of the first connecting device (506012). The cameras (506013) are fixed in the circumferential direction of the workpiece (100) at the outer wall appearance defect inspection station through the second connecting device (506014). The sixth light source device (50602) is a white ordinary surface light source, including a second support frame (506021). A light source assembly (506022) is set on the second support frame (506021). The white ordinary surface light emitted by the assembly is a backlight. A mask (506023) is set on the upper surface of the light source assembly (506022). The mask (506023) is arranged in a surrounding shape directly below the workpiece (100) at the outer wall appearance defect detection station. The mask (506023) is a ring-shaped opaque mask. The seventh light source device (50603) is a ring-shaped shadowless light source, and the ring-shaped shadowless light emitted by it is frontal light. The receiving assembly (508) sorts and transports the workpieces (100) into qualified and unqualified categories based on the detection results of the size and defects detected by the detection module.

2. The visual defect detection system according to claim 1, characterized in that, The distance between the upper surface of the sixth light source device (50602) and the workpiece (100) is 8mm. 30mm, the distance between the lower surface of the seventh light source device (50603) and the workpiece (100) is 40mm. 100mm.

3. The visual defect detection system according to claim 1 or 2, characterized in that, The rotating support plate (50101) is circular. The detection module further includes an upper inner wall detection unit (502), a lower inner wall detection unit (503), a lower port detection unit (504), an upper port detection unit (505), and a size detection unit (507). The upper inner wall detection unit (502), lower inner wall detection unit (503), lower port detection unit (504), upper port detection unit (505), outer wall detection unit (506), and size detection unit (507) are also included. 07) Six inspection stations are formed in the circumferential direction of the rotating support plate (50101) for detecting defects in the upper inner wall, lower inner wall, lower end face, upper end face, outer wall appearance defects and dimensional defects of the workpiece (100), respectively. The lower end inspection unit (504) and / or the upper end inspection unit (505) include a lens and two light sources. The lower end inspection unit (504) and the upper end inspection unit (505) are used to detect end face defects and end face dimensions.

4. The visual defect detection system according to claim 3, characterized in that, The upper inner wall detection unit (502), the lower inner wall detection unit (503), the upper port detection unit (505), and the size detection unit (507) each include a detection camera and a light source structure. The detection camera and the light source structure in the above detection units are located on opposite sides of the perspective rotating support plate (50101). The lower port detection unit (504) includes a detection camera and two light source structures, namely an annular shadowless light source and a collimated light source. The detection camera and the collimated light source in the lower port detection unit (504) are set above the perspective rotating support plate (50101), and the annular shadowless light source in the lower port detection unit (504) is set below the perspective rotating support plate (50101).

5. The visual defect detection system according to claim 1 or 4, characterized in that, The receiving assembly (508) includes a first receiving device (5081), a second receiving device (5082), and a third receiving device (5083). A second photoelectric detection device (5084) is provided between the first receiving device (5081) and the second receiving device (5082). The second photoelectric detection device (5084) is used to detect whether the workpiece (100) has passed through the collection station of the first receiving device (5081). A third photoelectric detection device (5085) is provided between the second receiving device (5082) and the third receiving device (5083). The third photoelectric detection device (5085) is used to detect whether the workpiece (100) has passed through the collection station of the second receiving device (5082). The first receiving device (5081), the second receiving device (5082), and the third receiving device (5083) are respectively used to collect workpieces (100) whose size and defect detection results are qualified, unqualified, and no detection information detected.

6. The visual defect detection system according to claim 1, characterized in that, The detection module includes six defect inspection stations: upper inner wall defect, lower inner wall defect, lower port end face, upper port end face, outer wall appearance defect, and dimensional defect. At each of the six defect inspection stations, there are correspondingly set up an upper inner wall inspection unit (502), a lower inner wall inspection unit (503), a lower port inspection unit (504), an upper port inspection unit (505), an outer wall inspection unit (506), and a dimensional inspection unit (507). The upper inner wall inspection unit (502) is used to detect defects in the upper half of the workpiece's inner hole; the lower inner wall inspection unit (503) is used to detect defects in the lower half of the workpiece's inner hole; the lower port inspection unit (504) is used to detect defects on the lower hole end face of the workpiece and measure the inner hole diameter; the upper port inspection unit (505) is used to detect defects on the upper hole end face of the workpiece; the outer wall inspection unit (506) is used to detect appearance defects on the outer wall of the workpiece; and the dimensional inspection unit (507) is used to measure the outer wall diameter of the lower hole, the outer wall diameter at the marked groove, the maximum outer circle step diameter, and the workpiece height.

Images