A mobile phone back cover surface defect detection device

Abstract

This utility model relates to a device for detecting surface defects on mobile phone back covers, comprising a loading machine, a cleaning machine, a vision inspection machine, and a unloading machine that work in sequence and in coordination. The loading machine is used for automatic loading, identification, and positioning of products. The cleaning machine has at least four cleaning stations, each employing a different cleaning method to clean the products. The vision inspection machine includes multiple inspection stations that perform inspections using a five-axis motion mechanism in conjunction with a vision acquisition system. The unloading machine is used for automatic sorting and outputting of products based on the inspection results. This utility model solves the problems of incomplete cleaning of irregularly shaped mobile phone back covers, and the easy retention of dirt and lint in existing equipment. It not only cleans thoroughly and has strong adaptability, but also improves the cleaning yield. It reduces the amount of vision components used, lowers costs, optimizes the machine layout, and achieves modularization and standardization, adapting to the multi-feature and multi-angle inspection needs of irregularly shaped products.

Description

Technical Field

[0001] This utility model relates to the field of visual inspection equipment technology, and in particular to a device for detecting surface defects on the back cover of a mobile phone. Background Technology

[0002] BGA products (phone back covers) are important structural and aesthetic components of smart terminals, and their surface quality directly affects the overall aesthetics and user experience. During the production process, phone back covers are prone to various appearance defects such as scratches, dents, dirt, missing materials, shrinkage, and color differences due to injection molding, spraying, CNC machining, and handling.

[0003] Currently, the industry mainly relies on the following two methods for the appearance inspection of mobile phone back covers: 1. Manual visual inspection: Operators make judgments by visual observation under specific lighting conditions. This method has problems such as high labor costs, low efficiency, susceptibility to subjective factors and fatigue, high rates of missed detections and false detections, and difficulty in digitally tracing the test results.

[0004] 2. Automated detection equipment: While using vision sensors in conjunction with a simple platform, it partially replaces manual labor, but still has significant shortcomings: 1) The cleaning method has obvious defects: it only relies on simple circumferential wiping action. For irregularly shaped mobile phone back covers, the grinding head is difficult to fully fit the product surface, resulting in some specific areas (such as the area around the camera, rounded corner platforms, etc.) not being effectively cleaned and easily leaving dirt residue. At the same time, the lint cloth is prone to shedding lint during the wiping process. These lints adhere to the product surface, which not only fails to achieve the ideal cleaning effect, but may also cause new interference to the subsequent testing process.

[0005] 2) In inspection equipment, vision components are mostly fixedly installed, and the product carrier only has a single direction of movement. When the product to be inspected has multiple inspection surfaces, or when there are multiple inspection requirements for the same inspection surface, traditional equipment needs to deploy multiple sets of vision components. Moreover, the camera angles, installation methods, and camera light source combinations of each set of components are different. This not only leads to high equipment costs and large machine size, but also makes it impossible to achieve modularization of the mechanism, resulting in poor compatibility and difficulty in adapting to the docking requirements of different upstream and downstream processing equipment. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a device for detecting defects on the surface of mobile phone back covers, thereby solving the problem that existing equipment cannot thoroughly clean irregularly shaped mobile phone back covers and easily leaves dirt and lint.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a BGA product appearance inspection device, including a feeding machine, a cleaning machine, a vision inspection machine and a unloading machine arranged in sequence and working in coordination; The output end of the feeder is connected to the input end of the cleaning machine; The cleaning machine includes a frame, on which a camera cleaning station, an arc edge cleaning station, a large surface cleaning station, and a non-contact secondary cleaning station are sequentially arranged along the product cleaning process. The frame also includes a cleaning transverse module for moving the product sequentially through each cleaning station, and a lint-free cloth mechanism located at each cleaning station. The camera cleaning station is equipped with a contour-following grinding head for cleaning the camera area; the arc edge cleaning station is equipped with a silicone grinding head for cleaning the arc edge area of ​​the camera's side platform; the large surface cleaning station is equipped with a large surface grinding head for cleaning the large surface of the product; and the non-contact secondary cleaning station is equipped with a rotating airflow cleaning mechanism. The output end of the cleaning machine is connected to the input end of a vision inspection machine. The vision inspection machine includes a dual-station five-axis inspection device, which includes a loading and conveying module. The loading and conveying module connects to a loading and positioning module, and the loading and conveying module transports the product to the loading and positioning module. The output end of the loading and positioning module connects to a first five-axis inspection module, which absorbs the product from the loading and positioning module and transfers it to a second five-axis inspection module. The first and second five-axis inspection modules have the same structure but are arranged opposite each other. The output end of the second five-axis inspection module connects to a discharge transfer module, and a discharge conveying module is located behind the discharge transfer module. The output end of the vision inspection machine is connected to the input end of the discharge machine. The feeding machine automatically sorts and outputs products based on the test results.

[0008] Furthermore, the cleaning transverse movement module of this utility model includes a linear conveying module and an XY moving carrier and a fixed carrier slidably disposed on the linear conveying module; the XY moving carrier and the fixed carrier respectively drive the product to different cleaning stations; the XY moving carrier also drives the product to achieve trajectory movement in the XY direction.

[0009] Furthermore, the contour grinding head described in this utility model is adapted to the area around the camera on the back of a mobile phone, and the contour grinding head is connected to a forward and reverse drive motor to perform forward and reverse coverage cleaning of the area around the camera.

[0010] Furthermore, the rotating airflow cleaning mechanism of this utility model includes a housing, on which an air inlet and an air suction port are provided. The inner cavity of the housing is provided with a plurality of rotating cleaning heads with nozzles. The rotating cleaning heads are connected to the air inlet. An electrostatic eliminator is also provided on the inner side of the housing. The electrostatic eliminator and the rotating cleaning heads are mounted on a mounting block inside the housing. A gap is left between the mounting block and the housing. An airflow channel is formed between the electrostatic eliminator and the mounting block and the side wall of the housing.

[0011] Furthermore, the air path of the rotary airflow cleaning mechanism of this utility model is as follows: air is introduced into the air inlet while air is drawn out through the air suction port; the rotary cleaning head rotates and blows airflow onto the product surface through the nozzle; the airflow flows out of the air suction port along the product surface through the airflow channel, while simultaneously performing secondary cleaning on the product's blind spots and residual lint on the surface.

[0012] Furthermore, the material handling module of this utility model includes a handling lifting mechanism, a product rotating mechanism, and a product pitch-changing cylinder; the product pitch-changing cylinder is disposed at the rotating end of the product rotating mechanism; the fixed end of the product rotating mechanism is connected to the handling lifting mechanism; and the movable end of the product pitch-changing cylinder is provided with a vacuum suction cup.

[0013] Furthermore, the feeding and positioning module of this utility model includes a positioning mechanism carrier, a positioning mechanism side, and a flipping power unit; the positioning mechanism carrier adsorbs the product, and both the positioning mechanism carrier and the positioning mechanism side are mounted on a rotating bracket; the output end of the flipping power unit is connected to the rotating bracket to drive the rotating bracket to flip.

[0014] Furthermore, the five-axis detection module one / five-axis detection module two of this utility model includes a vision carrier, an X-axis translation, a Y-axis translation, a Z-axis lifting, an A-axis flipping power unit, a C-axis rotation power unit, and a vision component. The vision carrier is mounted on a rotating arm, and the A-axis flipping power unit is connected to the rotating arm to drive the rotating arm to flip. The C-axis rotation power unit is connected to the vision carrier to drive the product on the vision carrier to rotate. A vacuum suction cup is provided on the vision carrier. The vision component is mounted on the Z-axis lifting mechanism.

[0015] Furthermore, the unloading transfer module and the unloading transport module of this utility model both have vacuum suction cups; the frame is also equipped with multiple buffer stations; the buffer stations are respectively arranged between each cleaning station.

[0016] Furthermore, the feeding machine of this utility model includes a buffer plate chain, a feeding and handling robot, a feeding secondary positioning mechanism, and a discharge belt; the feeding secondary positioning mechanism is located at the front end of the buffer plate chain and is used to straighten the product position; the feeding and handling robot is respectively located between the buffer plate chain and the discharge belt and at the tail end of the discharge belt and is used to handle the products; the discharge belt includes a good product belt and a bad product belt, which are respectively located on both sides of the flow channel and are used to transport the products outside the equipment. The beneficial effect of this utility model is that it solves the defects existing in the background technology. 1. Fully automated: It realizes full automation from automatic feeding, intelligent cleaning, multi-angle detection to automatic sorting, which greatly reduces manual input and improves production efficiency.

[0017] 2. High precision and high detection rate: The five-axis motion system ensures that the vision sensor can capture all the features to be inspected at the optimal angle and distance. Combined with multi-station cleaning, it reduces interference from the source, significantly improves the defect detection rate and accuracy, and reduces missed detections and false detections.

[0018] 3. High efficiency and compact layout: The dual-station back-to-back design optimizes the testing process, reduces material transfer time, and makes the equipment layout more compact, saving factory space.

[0019] 4. Intelligent and digital: The system has complete production data recording and analysis functions, providing a solid data foundation for process improvement and quality traceability, and helping to realize intelligent manufacturing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the feeding machine of this utility model; Figure 3 This is a schematic diagram of the structure of the cleaning machine of this utility model; Figure 4 This is a schematic diagram of the cleaning transverse module of this utility model; Figure 5 This is a schematic diagram of the contour grinding head and cleaning mechanism of the camera cleaning station of this utility model. Figure 6 This is a schematic diagram of the silicone grinding head and cleaning mechanism for the arc-edge cleaning station of this utility model. Figure 7 This is a schematic diagram of the large-area grinding head and cleaning assembly for the large-area cleaning station of this utility model. Figure 8 This is a schematic diagram of the rotating airflow cleaning mechanism of this utility model; Figure 9 This is a schematic diagram of the air path of the rotating airflow cleaning mechanism of this utility model; Figure 10 is a structural schematic diagram of the visual inspection machine of this utility model; Figure 11 is a schematic diagram of the dual-station five-axis detection mechanism of this utility model; Figure 12 is a structural schematic diagram of the material handling module of this utility model; Figure 13 is a structural schematic diagram of the material feeding and positioning module of this utility model; Figure 14 is a structural schematic diagram of the five-axis detection module (including X, A, and C axes) of this utility model; Figure 15 is a schematic diagram of the Y-axis translation structure of this utility model; Figure 16 This is a schematic diagram of the assembly of the Z-axis lifting and vision components of this utility model; Figure 17 is a schematic diagram of the structure of the feeding machine of this utility model; In the diagram: 1. Feeding machine; 2. Cleaning machine; 3. Vision inspection machine; 4. Unloading machine; 11. Material handling mechanism; 12. Tray lifting mechanism; 13. Tray loading mechanism; 14. Barcode scanner; 15. Tilting mechanism; 16. Secondary positioning mechanism; 17. Tray flow channel; 18. Empty tray handling mechanism; 21. Rack; 22. Camera cleaning station; 23. Curved edge cleaning station; 24. Large surface cleaning station; 25. Non-contact secondary cleaning station; 26. Cleaning transverse module; 27. Dust-free cloth mechanism; 28. Mobile phone BGA products; 221. Contouring grinding head; 231. Silicone grinding head; 241. Large surface grinding head; 251. Rotary airflow cleaning mechanism; 261. Linear conveyor module; 262. XY moving carrier; 263. Fixed carrier; 2511. Housing; 2512. Air inlet; 2513. Air suction outlet; 2514. Rotary cleaning head; 2515. Static eliminator; 2516. Mounting block; 2517. Gap; 31. Loading and handling module; 32. Loading and positioning module; 33. Five-axis inspection module 1; 34. Five-axis inspection module 2; 35. Unloading transfer module; 36. Unloading and handling module; 37. Product pitch-changing cylinder; 38. Product rotation mechanism; 39. Handling and lifting mechanism; 310. Positioning mechanism carrier; 311. Positioning mechanism side-mounted unit; 312. Tilting power unit; 313. A-axis tilting power unit; 314. C-axis rotation power unit; 315. X-axis translation; 316. Vision carrier; 317. Y-axis translation; 318. Z-axis lifting; 319. Vision component; 320. Rotating bracket; 321. Rotating arm; 41. Material handling robot; 42. Material secondary positioning mechanism; 43. OK belt; 44. NG belt; 45. Buffer plate chain. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0022] like Figures 1-17 The device shown is a mobile phone back cover surface defect detection device, which includes a loading machine 1, a cleaning machine 2, a vision inspection machine 3 and a unloading machine 4 arranged in sequence and working together.

[0023] The feeding machine 1 includes a feeding and conveying mechanism 11, a tray lifting mechanism 12, a tray feeding mechanism 13, a barcode scanner 14, a flipping mechanism 15, a secondary positioning mechanism 16, a tray flow channel 17, and an empty tray conveying mechanism 18. The feeding and conveying mechanism 11 is used to pick up materials from the connecting belt and place them onto the feeding machine's conveyor belt. The tray lifting mechanism 12 is used to lift the product tray from the hopper to the picking position. The tray feeding mechanism 13 is used to pick up materials from the tray and place them onto the feeding machine's conveyor belt. The barcode scanner 14 is used to identify the QR code on the inner surface of the product. The flipping mechanism 15 is used to flip the product 180°. The secondary positioning mechanism 16 is used to straighten the product position. The tray flow channel 17 is used to realize the conveying of full trays into the machine and the conveying of empty trays out of the machine. The empty tray conveying mechanism 18 is used to transport empty trays to the empty tray hopper after material removal.

[0024] The cleaning machine 2 includes a frame 21. Along the product cleaning process, the frame 21 is sequentially equipped with a camera cleaning station 22, an arc edge cleaning station 23, a large surface cleaning station 24, and a non-contact secondary cleaning station 25. The frame is also equipped with a cleaning transverse module 26 for moving the product through each cleaning station, and a lint-free cloth mechanism 27 set on each cleaning station. The frame 21 is also equipped with multiple buffer stations. The buffer stations are respectively set between each cleaning station. During cleaning, the XY moving carrier and the fixed carrier cooperate with the cleaning of each cleaning station through the buffer stations.

[0025] The cleaning transverse module 26 includes a linear conveying module 261 and an XY moving carrier 262 and a fixed carrier 263 slidably disposed on the linear conveying module; the XY moving carrier 263 and the fixed carrier 263 respectively drive the product to different cleaning stations; the XY moving carrier also drives the product to achieve trajectory movement in the XY direction.

[0026] The cleanroom wipe mechanism 27 is positioned above each cleaning station and includes a winding assembly, an unwinding assembly, and a tensioning assembly. New cleanroom wipes are wound onto the unwinding assembly. The wipes pass sequentially through the tensioning assembly and cover the cleaning ends of each cleaning head. Finally, the winding assembly winds them up. The tensioning assembly uses a spring tensioning structure to maintain the tension of the cleanroom wipes during the winding and unwinding process, ensuring close contact between the cleanroom wipes and the cleaning heads and product surfaces.

[0027] The camera cleaning station 22 is equipped with a contour grinding head 221 for cleaning the camera area; the contour grinding head has a concave structure that is adapted to the area around the camera on the back of the mobile phone, and the concave structure can be fitted onto the camera. The contour grinding head is connected to a forward and reverse drive motor, which can perform forward and reverse coverage cleaning of the area around the camera of the product.

[0028] The arc-edge cleaning station 23 is equipped with a silicone grinding head 231 for cleaning the arc-edge area of ​​the platform on the side of the camera. The XY moving carrier has a servo drive motor and a PLC trajectory control module, which can preset the corresponding motion trajectory according to the shape of the arc edge of different products. When the product moves to the arc-edge cleaning station with the XY moving carrier, the silicone grinding head fits against the arc edge of the product, and the XY moving carrier drives the product to move according to the preset trajectory, so that the silicone grinding head performs trajectory cleaning on the arc edge area.

[0029] The large-area cleaning station is equipped with 24 large-area grinding heads 241 for cleaning the large surface area of ​​the product; the structure of the large-area grinding head is a conventional cleaning grinding head, which will not be described in detail here. The motor drives the large-area grinding head to perform a rubbing motion, which contacts the large flat area of ​​the product and removes dirt from the area through the rubbing action.

[0030] After the product undergoes camera cleaning, curved edge cleaning, and large-area cleaning in sequence, lint and residual dust may be generated. Therefore, a non-contact secondary cleaning station is set up to further improve the product cleaning yield.

[0031] A rotating airflow cleaning mechanism 251 is provided on the non-contact secondary cleaning station 25. The rotating airflow cleaning mechanism includes a housing 2511, on which an air inlet 2512 and an air suction port 2513 are provided. Multiple rotating cleaning heads 2514 (typhoon cleaning heads) with nozzles are provided in the inner cavity of the housing. The rotating cleaning heads are connected to the air inlet. An electrostatic eliminator 2515 is also provided on the inner side of the housing. The electrostatic eliminator and the rotating cleaning heads are set on a mounting block 2516 inside the housing. A gap 2517 is left between the mounting block and the housing. An airflow channel is formed between the electrostatic eliminator and the mounting block and the side wall of the housing.

[0032] The air path of the rotating airflow cleaning mechanism is as follows: air is introduced into the air inlet while air is drawn out through the air suction port; the rotating cleaning head rotates and blows airflow onto the product surface through the nozzle; the airflow flows out of the air suction port along the product surface through the airflow channel, while performing secondary cleaning on the product cleaning blind spots and residual lint on the surface.

[0033] The rotary cleaning head sprays high-pressure airflow onto the product surface to blow away residual dust and lint from the lint-free cloth. The suction port is connected to a negative pressure device, which, while the rotary cleaning head is spraying airflow, uses negative pressure suction to promptly remove the blown-away dirt and transport it through a pipe to a dust collection device, preventing dirt from re-adhering to the product surface.

[0034] The rotating airflow cleaning mechanism is suitable for cleaning flat products. It uses a combination of static elimination, blowing, and suction. The static eliminator neutralizes the static electricity of the dust, the rotating airflow picks up the dust, and the suction carries away the dust particles, achieving a surface cleaning effect.

[0035] The rotary cleaning head uses a high-speed rotating nozzle to blow air. The airflow sweeps at a fixed speed, angle, and frequency, causing air pulsation. This, combined with the gaps, forms a powerful U-shaped airflow channel to remove burrs adhering to the product surface.

[0036] The vision inspection machine 3 includes a dual-station five-axis inspection device and other auxiliary mechanisms. The dual-station five-axis inspection device inspects the area of ​​the rear camera of a mobile phone. It includes a loading and transporting module 31, which connects to a loading and positioning module 32. The loading and transporting module 31 transports the product to the loading and positioning module 32. The output end of the loading and positioning module 32 connects to a first five-axis inspection module 33, which picks up the product from the loading and positioning module and transfers it to a second five-axis inspection module 34. The first five-axis inspection module and the second five-axis inspection module have the same structure but are set back to back. The back-to-back dual five-axis design allows the carrier to directly connect and transfer materials, enabling the product carrier to be switched while the product is flipped, and the machine completes a comprehensive inspection of the product. The output end of the five-axis detection module 2 is connected to the unloading transfer module 35, and the unloading transfer module is provided with an unloading and handling module 36 behind it.

[0037] The material handling module includes a handling lifting mechanism 39, a product rotation mechanism 38, and a product pitch-changing cylinder 37; the product pitch-changing cylinder is located at the rotating end of the product rotation mechanism; the fixed end of the product rotation mechanism is connected to the handling lifting mechanism; and the movable end of the product pitch-changing cylinder is equipped with a vacuum suction cup.

[0038] The loading and positioning module includes a positioning mechanism carrier 310, a positioning mechanism side 311, and a flipping power unit 312; the positioning mechanism carrier adsorbs the product, and both the positioning mechanism carrier and the positioning mechanism side are mounted on a rotating bracket 320; the output end of the flipping power unit is connected to the rotating bracket to drive the rotating bracket to flip.

[0039] Five-axis inspection system one and five-axis inspection system two have the same structure and are set back to back, including a vision vehicle 316, an X-axis translation 315, and a Y-axis translation (317 uses a dual-motion sub-module, such as...). Figure 5 As shown, the system includes a Z-axis lifting mechanism 318, an A-axis tilting power unit 313, a C-axis rotation power unit 314, and a vision assembly 319. The vision carrier is mounted on a rotating arm 321. The A-axis tilting power unit is connected to the rotating arm and drives it to tilt. The C-axis rotation power unit is connected to the vision carrier and drives the product on the vision carrier to rotate. The vision carrier is equipped with a vacuum suction cup. The vision assembly is mounted on the Z-axis lifting mechanism. Figure 6 As shown.

[0040] The two back-to-back five-axis inspection modules can directly achieve simultaneous carrier docking and product flipping. After the first five-axis inspection module completes the inspection of the product system surface, its vision carrier can directly dock with the vision carrier of the adjacent second five-axis inspection module. While switching carriers, the product flipping is naturally achieved by taking advantage of the back-to-back layout of the two modules (without the need for an additional flipping mechanism). The second five-axis inspection module then inspects the user surface of the flipped product. The entire process does not require secondary loading or intermediate transfer waiting, realizing continuous inspection at two workstations, significantly shortening the total inspection cycle of a single product, and is especially suitable for the high-efficiency inspection needs in mass production scenarios.

[0041] Moreover, the two five-axis detection modules share some auxiliary structures (such as some transmission components and wiring space) and are distributed in opposite directions along the same axis, which avoids the space waste of traditional parallel or distributed layouts, further compresses the horizontal / horizontal space occupied by the equipment, makes the machine structure more compact, and can be flexibly embedded into production lines of different lengths and widths, improving the adaptability of the equipment to the production line space.

[0042] Both the unloading transfer module and the unloading handling module are equipped with vacuum suction cups. In this embodiment, the docking is also achieved by using vacuum suction cups to adhere to the product surface (front / back).

[0043] The action process is as follows: In the feeding module, the feeding and handling module 31 adjusts its height under the drive of the handling and lifting mechanism 39, picks up the product from the previous inspection machine through the vacuum suction cup, adjusts the product angle through the product rotation mechanism 38 and adjusts the product spacing through the product pitch cylinder 37, and then transports the product to the feeding and positioning module 32. The positioning mechanism 311 of the feeding and positioning module 32 shrinks and straightens the product under the action of the cylinder (the driving cylinder of the positioning mechanism is not described in detail in this embodiment). The positioning mechanism carrier 310 adsorbs the product, and the secondary positioning mechanism further ensures that the product is centered. Then, the flipping power unit 312 drives the feeding and positioning module 32 to rotate 90° and dock with the vision carrier 316 of the five-axis inspection 33. The vacuum suction cup set on the vision carrier 316 adsorbs the product and completes the product transfer.

[0044] When the dual five-axis inspection module is working, the A-axis flipping power unit 313 of the five-axis inspection module 33 (inspecting the system surface of the product) drives the inspection module to flip to the appropriate angle, and the C-axis rotation power unit 314 drives the product on the vision carrier 316 to rotate. With the X-axis translation 315 and Y-axis translation 317, the center of the product inspection area is aligned with the center of the vision component 319. The Z-axis lifting 318 drives the vision component 319 to move up and down to the optimal inspection distance to complete the system surface inspection. After the inspection is completed, the vision carrier 316 of the five-axis inspection module 33 is directly docked with the vision carrier of the five-axis inspection module 34. The product is flipped while switching carriers by vacuum adsorption. The five-axis inspection module 34 adopts the same axis motion adjustment method as the five-axis inspection module 33 to complete the inspection of the user surface of the product.

[0045] In the unloading module, the unloading and handling module 36 picks up the product from the vision carrier 316 of the five-axis inspection unit 34 and transports the product to the unloading transfer module 35 for buffering. When the subsequent process requires it, the unloading and handling module 36 then transports the product to the downstream inspection machine to complete the entire inspection process.

[0046] The unloading machine 4 includes a buffer plate chain 45, an unloading and handling robot 41, an unloading secondary positioning mechanism 42, and an unloading conveyor belt. The unloading secondary positioning mechanism 42 is located at the front end of the buffer plate chain 45 and is used to straighten the product position. The unloading and handling robot 41 is located between the buffer plate chain and the unloading conveyor belt and at the tail end of the unloading conveyor belt, and is used to handle the products. The unloading conveyor belt includes an OK belt 43 and an NG belt 44. The good product belt and the bad product belt are respectively located on both sides of the flow channel line and are used to transport the products outside the equipment.

[0047] Based on the inspection results of the vision inspection machine, the unloading machine uses a material handling robot to classify the products into OK products and NG products; the NG products are then transported by the material handling robot to the NG conveyor belt and connected to the manual re-inspection channel.

[0048] The overall workflow of this device is as follows: Feeding stage: The manual staff places the full tray containing BGA products into the tray flow channel, which transports the full tray into the feeding machine. The tray lifting mechanism lifts the full tray to the picking position, and the tray feeding mechanism picks up the product from the tray and places it onto the feeding belt. At the same time, the feeding and conveying mechanism picks up the product from the connecting belt and places it onto the feeding belt. After the product on the feeding belt is scanned by the barcode scanner, it is rotated 180° by the flipping mechanism, and then its position is adjusted by the secondary positioning mechanism before being transported to the cleaning machine.

[0049] Cleaning stage: The cleaning transverse module moves the product through the four cleaning stations of the cleaning machine in sequence. Under the premise that the clean cloth mechanism keeps the clean cloth clean, the product’s different areas are thoroughly cleaned by a combination of cleaning grinding head (contact type) and VPV (non-contact type) to remove dirt from the product surface.

[0050] Inspection Phase: The loading robot assembly removes the cleaned products from the cleaning machine and places them into the AOI carrier of the vision inspection machine. After being positioned by the secondary positioning mechanism and the long side positioning mechanism, the inter-station transport mechanism moves the products through five inspection stations in sequence. In each inspection station, the alternating module inspection mechanism and the dual five-axis inspection mechanism inspect the product module defects respectively. After the products have been inspected, they are transported to the buffer plate chain line for buffering.

[0051] Material unloading stage: The secondary positioning mechanism for unloading aligns the positions of the products on the buffer plate chain. Based on the inspection results of the vision inspection machine, the unloading and handling robot moves the OK products to the discharge belt, which then transports them outside the equipment. The NG products are moved to the NG belt, which then transports them to the manual re-inspection channel.

[0052] The above description is only a specific embodiment of the present utility model. Various examples and illustrations do not constitute a limitation on the substantive content of the present utility model. Those skilled in the art can make modifications or variations to the above-described specific embodiments after reading the description without departing from the essence and scope of the utility model.

Claims

1. A device for detecting surface defects on the back cover of a mobile phone, characterized in that: This includes a feeding machine, a cleaning machine, a vision inspection machine, and a unloading machine that are arranged sequentially and work together. The output end of the feeder is connected to the input end of the cleaning machine; The cleaning machine includes a frame, on which a camera cleaning station, an arc edge cleaning station, a large surface cleaning station, and a non-contact secondary cleaning station are sequentially arranged along the product cleaning process. The frame also includes a cleaning transverse module for moving the product sequentially through each cleaning station, and a lint-free cloth mechanism located at each cleaning station. The camera cleaning station is equipped with a contour-following grinding head for cleaning the camera area; the arc edge cleaning station is equipped with a silicone grinding head for cleaning the arc edge area of ​​the camera's side platform; the large surface cleaning station is equipped with a large surface grinding head for cleaning the large surface of the product; and the non-contact secondary cleaning station is equipped with a rotating airflow cleaning mechanism. The output end of the cleaning machine is connected to the input end of a vision inspection machine. The vision inspection machine includes a dual-station five-axis inspection device, which includes a loading and conveying module. The loading and conveying module connects to a loading and positioning module, and the loading and conveying module transports the product to the loading and positioning module. The output end of the loading and positioning module connects to a first five-axis inspection module, which absorbs the product from the loading and positioning module and transfers it to a second five-axis inspection module. The first and second five-axis inspection modules have the same structure but are arranged opposite each other. The output end of the second five-axis inspection module connects to a discharge transfer module, and a discharge conveying module is located behind the discharge transfer module. The output end of the vision inspection machine is connected to the input end of the discharge machine. The feeding machine automatically sorts and outputs products based on the test results.

2. The mobile phone back cover surface defect detection device as described in claim 1, characterized in that: The cleaning transverse transfer module includes a linear conveying module and an XY moving carrier and a fixed carrier slidably mounted on the linear conveying module; the XY moving carrier and the fixed carrier respectively drive the product to different cleaning stations; the XY moving carrier also drives the product to achieve trajectory movement in the XY direction.

3. The mobile phone back cover surface defect detection device as described in claim 1, characterized in that: The contour grinding head is adapted to the area around the camera on the back of the mobile phone, and the contour grinding head is connected to a forward and reverse drive motor to perform forward and reverse coverage cleaning of the area around the camera.

4. The mobile phone back cover surface defect detection device as described in claim 1, characterized in that: The rotating airflow cleaning mechanism includes a housing with an air inlet and an air intake. Multiple rotating cleaning heads with nozzles are located inside the housing cavity. Each rotating cleaning head is connected to the air inlet. An electrostatic eliminator is also located inside the housing. The electrostatic eliminator and the rotating cleaning heads are mounted on a mounting block inside the housing, with a gap between the mounting block and the housing. An airflow channel is formed between the electrostatic eliminator, the mounting block, and the side wall of the housing.

5. The mobile phone back cover surface defect detection device as described in claim 4, characterized in that: The air path of the rotating airflow cleaning mechanism is as follows: air is introduced through the air inlet while air is drawn out through the air suction port; the rotating cleaning head rotates and blows airflow onto the product surface through the nozzle; the airflow flows out of the air suction port along the product surface through the airflow channel, while performing secondary cleaning on the product cleaning blind spots and residual lint on the surface.

6. The mobile phone back cover surface defect detection device as described in claim 1, characterized in that: The loading and handling module includes a handling and lifting mechanism, a product rotation mechanism, and a product pitch-changing cylinder; the product pitch-changing cylinder is located at the rotating end of the product rotation mechanism; the fixed end of the product rotation mechanism is connected to the handling and lifting mechanism; and the movable end of the product pitch-changing cylinder is equipped with a vacuum suction cup.

7. The mobile phone back cover surface defect detection device as described in claim 1, characterized in that: The loading and positioning module includes a positioning mechanism carrier, a positioning mechanism side, and a flipping power unit; the positioning mechanism carrier adsorbs the product, and both the positioning mechanism carrier and the positioning mechanism side are mounted on a rotating bracket; the output end of the flipping power unit is connected to the rotating bracket to drive the rotating bracket to flip.

8. The mobile phone back cover surface defect detection device as described in claim 1, characterized in that: The five-axis inspection module one / five-axis inspection module two includes a vision carrier, an X-axis translation, a Y-axis translation, a Z-axis lifting, an A-axis flipping power unit, a C-axis rotation power unit, and a vision component. The vision carrier is mounted on a rotating arm. The A-axis flipping power unit is connected to the rotating arm and drives the rotating arm to flip. The C-axis rotation power unit is connected to the vision carrier and drives the product on the vision carrier to rotate. A vacuum suction cup is provided on the vision carrier. The vision component is mounted on the Z-axis lifting mechanism.

9. The mobile phone back cover surface defect detection device as described in claim 1, characterized in that: The unloading transfer module and the unloading transport module are both equipped with vacuum suction cups; the frame is also equipped with multiple buffer stations; the buffer stations are respectively located between each cleaning station.

10. The mobile phone back cover surface defect detection device as described in claim 1, characterized in that: The feeding machine includes a buffer plate chain, a feeding and handling robot, a secondary positioning mechanism, and a discharge belt. The secondary positioning mechanism is located at the front end of the buffer plate chain and is used to position the products. The feeding and handling robot is located between the buffer plate chain and the discharge belt, and at the tail end of the discharge belt, for transporting products. The discharge belt includes a good product belt and a bad product belt, which are located on both sides of the flow channel and are used to transport the products outside the equipment.

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