A third optical detection device

Abstract

A third-stage optical inspection device includes a chassis, on which a detection mechanism and a conveying mechanism are mounted. The conveying mechanism is connected to a material transfer mechanism at both ends, enabling adjustable automatic feeding of PCBA boards. The detection mechanism utilizes a first horizontal linear module and a second horizontal linear module to smoothly move a first CCD camera or a second CCD camera, enabling large-scale optical inspection of the PCBA boards on a fixed plane. A fine-tuning servo motor is used to finely adjust the sliding of a lead screw. The second CCD camera enables ordinary optical inspection of the PCBA boards on the conveying mechanism at different heights. This invention combines high-precision and medium-precision cameras, ensuring comprehensive coverage of PCBA board inspection. The material transfer mechanism and conveying mechanism are adjustable according to the specifications and dimensions of the PCBA boards, and the automation of feeding and unloading greatly improves the efficiency of PCBA board inspection.

Description

Technical Field

[0001] This invention relates to the technical field of optical inspection equipment for semiconductor chips, and particularly to a third-stage optical inspection device. Background Technology

[0002] The third-stage optical inspection equipment (referred to as the three-stage optical inspection machine) is an inspection device used in the back-end packaging process of semiconductor manufacturing. It is used for inspection of the packaging process after bonding, primarily for quality control after wire bonding. Through three-dimensional measurement technology, it achieves three-dimensional measurement of the wires, detecting wire bonding point quality, wire arc height control, wire misalignment, wire breakage, and wire overlap.

[0003] Existing technologies often lack automated feeding capabilities, resulting in low automation levels. Furthermore, the design of chip placement tracks is often inadequate, hindering flexible viewing angle adjustments and adaptability to different chip sizes. This leads to the development of an IC chip optical tri-optical analyzer (publication number CN217605666U), comprising: a platform track and a microscope adjacent to it. The platform track includes a loading section, an observation section, and a unloading section connected sequentially. The loading section is equipped with a loading clamp to move the chip placed there to the observation section. The observation section has a fixed stage for placing the chip, rotatably connected to the observation section and linked to a push cylinder. The push cylinder pushes the fixed stage to tilt it relative to the plane of the platform track. The unloading section is equipped with an unloading clamp to move the chip from the fixed stage to the unloading section. The observation position and direction can be adjusted according to the needs of the staff; the platform track is suitable for different specifications of sheet metal; the pushing position is adjustable and suitable for various types of sheet metal; loading and unloading are flexible and convenient; it has good adaptability and convenience, which greatly improves the detection efficiency. However, in the process of PCBA board inspection, the optical detection range is limited and can only be detected on one surface. For large areas and PCBA boards with layered structures on the surface, it is often difficult to detect them properly. Due to the inadequate optical detection during the inspection process, it is difficult to determine whether the PCBA board is good or bad in the subsequent judgment process. This results in the need for the PCBA board to be re-inspected manually. Summary of the Invention

[0004] The purpose of this invention is to provide a third-stage optical inspection device that, while facilitating the loading and unloading of PCBA boards and the adjustment of PCBA board dimensions, solves the problem of difficulty in accurately detecting the layered structure of the PCBA board surface during the inspection process.

[0005] To address this, the present invention provides the following technical solution: a third-stage optical inspection device, comprising a chassis, an internal frame inside the chassis, the internal frame including an upper mounting surface, an inspection mechanism mounted on the upper part of the upper mounting surface and a conveying mechanism passing through the lower part of the inspection mechanism, the conveying mechanism having material transfer mechanisms for loading or unloading PCBA boards at both ends, the inspection mechanism including an inspection seat mounted on the upper mounting surface, the inspection seat having a first horizontal linear module parallel to the transmission direction of the conveying mechanism, the first horizontal linear module including a pair of transverse supports, a first slide rail on the upper part of the transverse supports, a slidable first sliding seat mounted on the first slide rail, a second horizontal linear module perpendicular to the first horizontal linear module between the first sliding seats, the second horizontal linear module including a support beam erected between the first sliding seats, a second slide rail mounted on the side wall of the support beam, a connecting unit on the second slide rail, the connecting unit including a connecting platform and an inspection support plate connected to the connecting platform, the inspection... An upper fixed plate and a lower fixed plate are fixed on the upper and lower sides of the measuring support plate. A first CCD camera is installed between the upper and lower fixed plates via a first connecting frame. A third vertical slide rail is provided on the measuring support plate. A sliding plate is slidably provided on the third slide rail. A second connecting frame is installed on the sliding plate. A second CCD camera is installed on the second connecting frame. A fine-tuning servo motor is provided on the connecting platform. A lead screw is connected to the rotating shaft of the fine-tuning servo motor. The lead screw is rotatably supported on the measuring support plate by a pair of support blocks. A connecting block is connected between the pair of support blocks by a lead screw sleeve. The connecting block is connected to the sliding plate. Optical detection of the PCBA board on the conveying mechanism on the horizontal plane is realized by the first and second horizontal linear modules, the first CCD camera or the second CCD camera. Ordinary optical detection of the PCBA board on the conveying mechanism at different heights is realized by the fine-tuning servo motor for fine-tuning the slide of the lead screw.

[0006] Furthermore, the first CCD camera is a high-resolution camera with a resolution of 0.5 to 5 micrometers. The first CCD camera is fixedly mounted on the detection support plate via a first connecting bracket, thereby ensuring stable and high-precision optical detection of the PCBA board.

[0007] Furthermore, the second CCD camera is a medium-resolution camera with a resolution of 10-50 micrometers. The second CCD camera is mounted on a sliding plate via a second connecting bracket. By using a fine-tuning servo motor to adjust the lead screw, the second CCD camera can perform fine-tuning of the height of the detection points on the PCBA board for ordinary optical inspection.

[0008] Furthermore, the conveying mechanism includes a base, on which a first side plate and a pair of guide rails are provided. The first side plate and the pair of guide rails are parallel to each other. A downward conveying groove is provided on each guide rail. A sliding groove for positioning and moving the PCBA board is formed between the conveying grooves of the pair of guide rails. A pressure plate is provided on the guide rail below the detection mechanism. The pressure plate is an elastic silicone plate. A detection position for the PCBA board is formed between the pressure plate and the conveying groove. A clamping cylinder is provided below the detection position between the guide rails. The clamping cylinder clamps the PCBA board from the bottom. During detection, the clamping cylinder applies different clamping forces to the PCBA board, so that the height of the PCBA board can be adjusted by 0.05~0.2 mm when it is against the pressure plate.

[0009] Furthermore, a belt drive unit is provided on the first side plate. The belt drive unit includes a drive motor and two drive pulleys connected by a first belt. One of the drive pulleys is connected to the power shaft of the drive motor, and the other drive pulley is connected to a first hexagonal drive shaft. The first hexagonal drive shaft is rotatably connected between the first side plate and a pair of guide rails. A first synchronous pulley is mounted on the outer side of the first hexagonal drive shaft on the guide rails. The first synchronous pulley connects to a first synchronous belt located at the other end of the guide rails. A synchronous pulley connection is provided, and a transfer unit is connected to the first synchronous belt. The transfer unit includes two pairs of L-shaped push plates, which are located between the guide rails. Each pair of L-shaped push plates is equipped with a stop block. The L-shaped push plates are movable up and down. When the L-shaped push plate falls, the stop block falls below the conveying trough. When the L-shaped push plate rises, the stop block is above the conveying trough. The stop block moves the PCBA board between the conveying troughs from one end in the feeding direction to the detection position, or moves the PCBA board at the detection position to one end in the unloading direction.

[0010] Furthermore, the L-shaped push plate has an extension at its lower part, which extends from the inner side of the guide rails to the outer side of the guide rails. A cylinder guide rail is provided on the outer side wall of the guide rails, and a pressing cylinder is slidably connected to the cylinder guide rail. The extension is connected to the telescopic rod end of the pressing cylinder. The pressing cylinders on the two L-shaped push plates on the same side are connected together by a connecting plate. The connecting plate is provided with a first clamping block, which clamps the first synchronous belt. Driven by the belt drive unit, the first synchronous belt rotates, and the two pairs of L-shaped push plates connected in the front and rear synchronously push the PCBA board on the conveying groove.

[0011] Furthermore, the conveying mechanism also includes an adjustment unit, which enables the guide rail platform near the first side plate to be automatically adjustable to achieve adjustable spacing between the conveying troughs. The adjustment unit includes an adjustment motor and a pair of adjustment pulleys mounted on the first side plate. The pair of adjustment pulleys are connected by a first connecting belt. One of the adjustment pulleys is coaxially connected to the adjustment motor. An adjustment screw is also connected to one of the adjustment pulleys. The adjustment screw is connected to the guide rail platform near the first side plate. An adjustment slider is also mounted on the bottom of the guide rail platform, and the adjustment slider is slidably connected to an adjustment slide rail mounted on the base. When adjusting the spacing between the conveying troughs, the adjustment motor is activated, and the adjustment motor drives the guide rail platform to slide on the adjustment slide rail through the adjustment screw, thereby increasing or decreasing the distance between the two guide rail platforms.

[0012] Furthermore, the material transfer mechanism includes two oppositely arranged conveying units. Each conveying unit includes a conveying frame, with driven synchronous pulleys rotatably mounted on both end sidewalls of the conveying frame. A power transmission unit is provided in the middle of the conveying frame, and a material transfer motor is connected to the power transmission unit for its drive. The power transmission unit and the driven synchronous pulleys are connected by a second synchronous belt. The upper part of the conveying frame is also provided with a limiting plate. The limiting plate between the two conveying frames forms a material transfer groove that can limit the material box. The two conveying frames are adjustable. A second adjusting slider is installed at the bottom of one of the conveying frames, and the second adjusting slider slides in cooperation with a second adjusting slide rail installed in the internal frame. There is a pair of second adjusting slide rails, and a fixed seat fixed in the internal frame is provided between the pair of second adjusting slide rails. A dovetail groove is opened on the fixed seat, and a positioning bolt is provided on the dovetail groove. The positioning bolt fixes the conveying frame after adjustment and positioning through the positioning block.

[0013] Furthermore, the power transmission unit includes a second hexagonal drive shaft connected to the material conveying motor and a bushing sleeve fitted onto the second hexagonal drive shaft. The bushing sleeve has a hexagonal groove corresponding to the second hexagonal drive shaft inside. The bushing sleeve has a protruding bushing retainer. The bushing sleeve is fitted with a drive synchronizing pulley and a bearing. The drive synchronizing pulley and the bearing are separated by the bushing retainer. The bushing sleeve also has fixing slots at both ends. The fixing slots are fitted with elastic clamps. The elastic clamps fix the drive synchronizing pulley or the bearing. The bearing is fitted with a locking block. A retaining ring is provided between the locking block and the bearing. The locking block is fixedly connected to the conveyor frame. After the locking block is fixedly connected, the drive synchronizing pulley is connected to the second synchronous belt drive.

[0014] Furthermore, the material transfer mechanism is provided in two pairs, respectively located at the loading end and unloading end of the conveying mechanism. Each pair of material transfer mechanisms is arranged vertically and connected to each other by a lifting mechanism. The upper part of the material transfer mechanism at the loading end is used to load the material box containing the PCBA board, and the lower part is used to collect and receive the empty material box. The upper part of the material transfer mechanism at the unloading end is used to collect qualified PCBA boards, and the lower part is used to collect unqualified PCBA boards.

[0015] Furthermore, the lifting mechanism includes a first linear module, which is connected between the upper and lower material transfer mechanisms. The first linear module is provided with a lifting slide plate that can slide up and down. A second linear module is installed on the lifting slide plate. The second linear module is horizontally arranged. A receiving plate is installed on the sliding plate of the second linear module. A clamping cylinder is installed on the receiving plate. A clamping plate is installed at the telescopic rod end of the clamping cylinder. A clamping structure is formed between the receiving plate and the clamping plate to clamp and fix the material box or PCBA board. During loading, the first linear module aligns the receiving plate with the transmission surface of the upper material transfer mechanism. The second linear module moves the clamping structure onto the material box at one end of the material transfer mechanism, clamps it, and moves it to the position of the conveying mechanism. When the material box is empty, the first linear module aligns the receiving plate with the transmission surface of the lower material transfer mechanism. The second linear module moves the clamping structure onto the transmission surface of the lower material transfer mechanism, and moves the clamped empty material box onto the lower material transfer mechanism. During unloading, the clamping structure clamps the inspected PCBA board. The first linear module aligns the receiving plate with the transmission surface of the corresponding material transfer mechanism. The second linear module moves the clamping structure onto the material transfer mechanism. Qualified PCBA boards are placed on the upper material transfer mechanism on the unloading end side, and unqualified PCBA boards are placed on the lower material transfer mechanism on the unloading end side.

[0016] Furthermore, a pusher mechanism is also provided on the upper part of the material conveying mechanism on the feeding end side. The pusher mechanism includes a pusher base and a pusher motor. Pulleys are installed at both ends of the pusher base and are connected to each other by a pusher belt. One of the pulleys is coaxially connected to the pusher motor. A belt clamping block is provided on the pusher belt. The belt clamping block is connected to a connecting seat. The connecting seat is connected to a pusher slider. A pusher slide rail is also provided on the upper part of the pusher base. The pusher slider slides in cooperation with the pusher slide rail. A pusher plate parallel to the pusher base is installed on the connecting seat. The pusher motor causes the pusher slider to slide on the pusher slide rail. When the pusher plate is pushed out, it pushes the PCBA board in the material box clamped on the lifting mechanism out of the material box and positions it on the conveying groove of the conveying mechanism.

[0017] This invention utilizes dual CCD cameras. The high-precision CCD camera, while maintaining a fixed height, can effectively achieve high-precision optical detection of the horizontal plane of the PCBA board at the detection position. Maintaining a fixed height ensures the stability of the high-precision camera during the detection process, reducing errors. The high-precision CCD camera achieves high-precision static planar measurement. The medium-precision CCD camera not only performs normal optical detection of the horizontal plane of the PCBA board at the detection position, but can also further achieve ordinary optical detection of different height planes of the PCBA board at the detection position by finely adjusting its height. The medium-precision CCD camera achieves dynamic medium-precision measurement on a three-dimensional plane. Thus, this invention achieves a "dynamic and static" combination of three-dimensional dynamic and planar static detection during product inspection. Three-dimensional dynamic detection ensures rapid and comprehensive inspection of the product, identifying potentially defective areas or conditions. Planar static detection further provides high-precision detection of identified defective areas or conditions, ensuring comprehensive coverage of PCBA board inspection by the inspection agency.

[0018] This invention utilizes a clamping cylinder to press the bottom of the PCBA board, ensuring board stability during inspection and improving inspection reliability. Furthermore, by leveraging the elasticity of the pressure plate, the clamping cylinder can slightly alter the height of the PCBA board's inspection position by 0.05 to 0.2 millimeters when different clamping forces are applied. This allows for adaptive micro-adjustments when the height of the first CCD camera is fixed and cannot be adjusted, ensuring better focusing of the first CCD camera during targeted inspection.

[0019] This invention also enables the material transfer mechanism and conveying mechanism to be adjusted according to the specifications and dimensions of the PCBA board during the testing process, thus automating the loading and unloading process and greatly improving the efficiency of PCBA board testing. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of the detection device.

[0021] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the detection device.

[0022] Figure 3 This is a schematic diagram of the three-dimensional structure of the testing facility.

[0023] Figure 4 A schematic diagram of the three-dimensional structure installed inside the testing facility.

[0024] Figure 5 This is a schematic diagram of the three-dimensional structure of the connecting unit.

[0025] Figure 6 A three-dimensional structural diagram of the servo motor being mounted on the connection unit for fine-tuning.

[0026] Figure 7 This is one of the schematic diagrams of a conveyor mechanism.

[0027] Figure 8 This is the second schematic diagram of the conveying mechanism structure.

[0028] Figure 9 This is a schematic diagram of the three-dimensional structure of the transfer unit.

[0029] Figure 10 This is a schematic diagram of the three-dimensional structure of the material transfer mechanism.

[0030] Figure 11 This is a three-dimensional exploded view of the power transmission unit.

[0031] Figure 12 This is a schematic diagram of the three-dimensional structure of the pusher mechanism.

[0032] Figure 13 This is a schematic diagram of the three-dimensional structure of the lifting mechanism.

[0033] Wherein: 100-Chassis, 101-Detection Control Panel, 102-First Viewing Window, 103-Second Viewing Window, 104-Third Viewing Window, 105-Fourth Viewing Window, 200-Internal Frame, 201-Upper Mounting Surface, 202-Lower Mounting Surface, 300-Detection Mechanism, 301-Detection Seat, 302-First Horizontal Linear Module, 3021-Horizontal Support, 3022-First Slide Rail, 3023-First Sliding Seat, 3024-First Slider, 303-Second Horizontal Linear Module, 3031-Support Beam, 3032-Second Slide Rail, 304-Connecting Unit, 3041-Connecting Platform, 3042-Detection Support Plate, 3043-Second Slider, 3044-Third Slide Rail, 3045-Upper Fixing Plate, 3046- Sliding plate, 3047-Third slider, 3048-Lower fixed plate, 305-First CCD camera, 3051-First connecting frame, 3052-First annular aperture, 306-Second CCD camera, 3061-Second connecting frame, 3062-Second annular aperture, 307-Fine-tuning servo motor, 3071-Support block, 3072-Connecting block, 3073-Lead screw, 3074-Lead screw sleeve, 400-Conveying mechanism, 401-Base, 402-First side plate, 403-Guide rail, 4031-Conveying groove, 404-Pressure plate, 405-Transfer unit, 4051-L-shaped push plate, 4051a-Stop block, 4051b-Extension, 4052-Pressing cylinder, 4053-Connecting plate, 4 054-First clamping block, 4055-Cylinder guide rail, 4056-Cylinder slider, 406-Clamping cylinder, 407-Belt drive unit, 4071-Drive motor, 4072-Drive wheel, 4073-First belt, 4074-First hexagonal drive shaft, 4075-First synchronous pulley, 4076-First synchronous belt, 408-Adjusting unit, 4081-Adjusting motor, 4082-Adjusting pulley, 4083-First connecting belt, 4084-Adjusting screw, 4085-Adjusting slide rail, 4086-Adjusting slider, 4087-Adjusting screw sleeve, 4088-Second connecting belt, 409-First conveying sensor, 410-End sensor, 500-Material transfer mechanism, 501-Material transfer motor. 502-Power transmission unit, 5021-Second hexagonal drive shaft, 5022-Drive synchronous pulley, 5023-Busset, 5023a-Busset retaining post, 5023b-Fixing slot, 5024-Bearing, 5025-Elastic clamp, 5026-Retaining ring, 5027-Locking block, 503-Conveying unit, 5031-Conveying frame, 5032-Limiting plate, 5033-Second synchronous belt, 5034-Driven synchronous pulley, 504-Material sensor, 505-Second adjusting slide rail, 506-Second adjusting slider, 507-Positioning bolt, 508-Fixing seat, 5081-Dovetail groove, 509-Positioning block, 600-Push plate mechanism, 601-Push plate seat, 602-Push plate motor, 603-Pulley.604-Push plate belt, 605-Belt clamping block, 606-Connecting seat, 607-Push plate slider, 608-Push plate slide rail, 609-Push plate, 700-Lifting mechanism, 701-First linear module, 702-Lifting slide plate, 703-Second linear module, 704-Receiving plate, 705-Clamping cylinder, 706-Clamping plate, 800-Material box, 900-PCBA board. Detailed Implementation

[0034] The embodiments of the present invention will now be briefly described with reference to the accompanying drawings.

[0035] A third optical detection device, referring to Figure 1 , Figure 2 The system includes a chassis 100, inside which is an internal frame 200. The internal frame 200 includes an upper mounting surface 201 and a lower mounting surface 202. A detection mechanism 300 and a conveying mechanism 400 extending below the detection mechanism 300 are mounted on the upper mounting surface 201. The conveying mechanism 400 has two connected transfer mechanisms 500 for loading or unloading PCBA boards 900. Two pairs of transfer mechanisms 500 are provided, located at the loading and unloading ends of the conveying mechanism 400 respectively. Each pair of transfer mechanisms 500 is arranged vertically and connected via a lifting mechanism 700. The front end of the chassis 100 has multiple openable windows corresponding to the transfer mechanisms 500, including a first... The system includes windows 102, 103, 104, and 105. Window 102 corresponds to the upper material transfer mechanism 500 at the loading end, used to load the material box 800 containing the PCBA board 900. Window 104 corresponds to the lower material transfer mechanism 500 at the loading end, used to collect empty material boxes 800. Window 103 corresponds to the upper material transfer mechanism 500 at the unloading end, used to collect qualified PCBA boards 900. Window 105 corresponds to the lower material transfer mechanism 500 at the unloading end, used to collect unqualified PCBA boards 900. A detection control panel 101 is also provided in the middle of the front end of the chassis 100, used to observe or control the optical detection operation of the PCBA board 900.

[0036] Reference Figure 3The detection mechanism 300 includes a detection seat 301 mounted on the upper mounting surface 201. The detection seat 301 has a first horizontal linear module 302 parallel to the transmission direction of the conveying mechanism 400. The first horizontal linear module 302 includes a pair of transverse supports 3021. A first slide rail 3022 is provided on the upper part of the transverse supports 3021. A slidable first sliding seat 3023 is mounted on the first slide rail 3022. A first slider 3024 is provided on the first sliding seat 3023. The first sliding seat 3023 slides through the cooperation of the first slider 3024 and the first slide rail 3022. A second horizontal linear module 303 perpendicular to the first horizontal linear module 302 is provided between the first sliding seats 3023. The second horizontal linear module 303 includes a support beam 3031 supported between the first sliding seats 3023. A second slide rail 3032 is mounted on the side wall of the support beam 3031. A connecting unit 304 is provided on the second slide rail 3032. Figure 4 and Figure 5 The connecting unit 304 includes a connecting platform 3041 and a detection support plate 3042 connected to the connecting platform 3041. The detection support plate 3042 is provided with a second slider 3043 corresponding to the second slide rail 3032. The sliding cooperation between the second slide rail 3032 and the second slider 3043 enables the movement of the detection support plate 3042. An upper fixing plate 3045 and a lower fixing plate 3048 are fixed to the upper and lower sides of the detection support plate 3042. A first CCD camera 305 is mounted between the upper fixing plate 3045 and the lower fixing plate 3048 via a first connecting bracket 3051. The first CCD camera 305 is a high-resolution camera with a resolution of 0.5~5 micrometers. A first annular aperture 3052 is provided below the first CCD camera 305. The first CCD camera 305 can detect the PCBA board 9 The high-precision optical inspection of the PCBA board 900 includes a vertical third slide rail 3044 on the inspection support plate 3042, a sliding plate 3046 slidably mounted on the third slide rail 3044, and a third slider 3047 corresponding to the third slide rail 3044 on the sliding plate 3046. The sliding plate 3046 moves up and down using the sliding engagement between the third slider 3047 and the third slide rail 3044. A second connecting frame 3061 is mounted on the sliding plate 3046, and a second CCD camera 306 is mounted on the second connecting frame 3061. The second CCD camera 306 is a medium-resolution camera with a resolution of 10-50 micrometers. A second annular aperture 3062 is located below the second CCD camera 306. The second CCD camera 306 can perform ordinary optical inspection of the PCBA board 900. Figure 6The connecting platform 3041 is equipped with a fine-tuning servo motor 307. A lead screw 3073 is connected to the rotating shaft of the fine-tuning servo motor 307. The lead screw 3073 is rotatably supported on the detection support plate 3042 through a pair of support blocks 3071. A connecting block 3072 is connected between the pair of support blocks 3071 through a lead screw sleeve 3074. The connecting block 3072 is connected to the sliding plate 3046. During optical inspection, the PCBA board 900 uses the first horizontal linear module 302 and the second horizontal linear module 303 to smoothly move the first CCD camera 305 or the second CCD camera 306, enabling the PCBA board 900 to perform large-scale optical inspection on a fixed plane. The fine-tuning servo motor 307 is used to finely adjust the slide of the lead screw 3073, and the second CCD camera 306 enables ordinary optical inspection of the PCBA board 900 on the conveying mechanism 400 at different heights.

[0037] During product inspection, the first CCD camera 305 has a fixed height, enabling precise optical inspection of the horizontal plane of the PCBA board 900 at the inspection position. This stability reduces errors and achieves high-precision static measurement. The second CCD camera 306 not only performs normal optical inspection of the horizontal plane of the PCBA board 900 at the inspection position but also allows for general optical inspection of different height planes of the PCBA board 900 by finely adjusting its height. The second CCD camera 306 achieves dynamic medium-precision measurement on a three-dimensional plane. The combination of the first CCD camera 305 and the second CCD camera 306 achieves a "one dynamic, one static" coordination of three-dimensional dynamic and planar static inspections. Three-dimensional dynamic inspection ensures rapid and comprehensive product inspection, identifying potentially defective areas or conditions. Planar static inspection further provides high-precision inspection of identified defective areas or conditions, ensuring comprehensive coverage of the PCBA board 900 by the inspection mechanism 300.

[0038] Reference Figure 7 , Figure 8The conveying mechanism 400 includes a base 401, on which a first side plate 402 and a pair of guide rails 403 are mounted. The first side plate 402 and the pair of guide rails 403 are parallel to each other. A falling conveying groove 4031 is provided on the guide rails 403. A sliding groove for positioning and moving the PCBA board 900 is formed between the conveying grooves 4031 of the pair of guide rails 403. A pressure plate 404 is provided on the guide rails 403 below the detection mechanism 300. The pressure plate 404 is an elastic silicone plate. A detection position for the PCBA board 900 is formed between the pressure plate 404 and the conveying groove 4031 during detection. Below the detection position between the guide rails 403, a clamping cylinder 406 is provided. The clamping cylinder 406 clamps the PCBA board 900 from the bottom. During detection, the clamping cylinder... The cylinder 406 applies different clamping forces to the PCBA board 900, allowing the height of the PCBA board 900 to be adjusted by 0.05~0.2 mm as it abuts against the pressure plate 404. This configuration, by using the clamping cylinder 406 to press the bottom of the PCBA board 900, ensures the stability of the PCBA board 900 during inspection, improving the reliability of the inspection. Moreover, by utilizing the elasticity of the pressure plate 404, the clamping cylinder 406 can slightly change the height of the PCBA board 900's inspection position by 0.05~0.2 mm after applying different clamping forces. This allows for adaptive micro-adjustments when the height of the first CCD camera 305 is fixed and cannot be adjusted, ensuring better focusing of the first CCD camera 305 during targeted inspection.

[0039] The first side plate 402 is equipped with a belt drive unit 407, which provides power to the conveying mechanism 400. The belt drive unit 407 includes a drive motor 4071 and two drive pulleys 4072 connected by a first belt 4073. One drive pulley 4072 is connected to the power shaft of the drive motor 4071, and another drive pulley 4072 is connected to a first hexagonal drive shaft 4074. The first hexagonal drive shaft 4074 is rotatably connected between the first side plate 402 and a pair of guide rails 403. A first synchronous pulley 4075 is mounted on the outer side of the first hexagonal drive shaft 4074 on the guide rails 403. The first synchronous pulley 4075 is connected to the other end of the guide rails 403 via a first synchronous belt 4076. A transfer unit 405 is connected to the first synchronous belt 4076. Figure 9The transfer unit 405 includes two pairs of L-shaped push plates 4051, located between guide rails 403. Each pair of L-shaped push plates 4051 has a stop block 4051a. The L-shaped push plates 4051 are vertically movable. When the L-shaped push plates 4051 fall, the stop block 4051a falls below the conveying trough 4031, thus concealing the L-shaped push plates 4051 between the guide rails 403. When the L-shaped push plates 4051 are raised, the stop block 4051a is higher than the conveying trough 4031. Therefore, when the L-shaped push plates 4051 move, the stop block 4051a moves the PCBA boards 900 between the conveying troughs 4031 from one end in the feeding direction. Upon reaching the detection position, or with stop 4051a moving the PCBA board 900 at the detection position to one end in the unloading direction, the lower part of the L-shaped push plate 4051 is provided with an extension 4051b, which extends from the inner side of the guide rails 403 to the outer side of the guide rails 403. A cylinder guide rail 4055 is provided on the outer side wall of the guide rails 403, and a pressing cylinder 4052 is slidably connected to the cylinder guide rail 4055. A cylinder slider 405 is provided on the pressing cylinder 4052. 6. The cylinder guide rail 4055 and the cylinder slider 4056 are slidably engaged. The extension 4051b is connected to the telescopic rod end of the pressing cylinder 4052. The pressing cylinders 4052 on the two L-shaped push plates 4051 on the same side are connected together by a connecting plate 4053. The connecting plate 4053 is provided with a first clamping block 4054, which clamps and connects to the first synchronous belt 4076. Driven by the belt drive unit 407, the first synchronous belt 4051... 76. Rotating, the two pairs of L-shaped push plates 4051 connected at the front and rear simultaneously push the PCBA board 900 on the conveying groove 4031. Through the above setting, one pair of L-shaped push plates 4051 pushes the PCBA board 900 at the front end of the conveying mechanism 400 to the detection position, while at the same time, the other pair of L-shaped push plates 4051 simultaneously pushes the PCBA board 900 at the detection position to the rear end of the conveying mechanism 400, ensuring the continuity of detection.

[0040] The conveying mechanism 400 is also equipped with an adjustment unit 408, which is used to automatically adjust the spacing between the conveying troughs 4031, thereby meeting the conveying requirements of PCBA boards 900 of different sizes and specifications. The adjustment unit 408 includes an adjustment motor 4081 mounted on the first side plate 402 and a pair of adjustment pulleys 4082 rotatably mounted on the first side plate 402. The pair of adjustment pulleys 4082 are connected by a first connecting belt 4083. One of the adjustment pulleys 4082 is coaxially connected to the adjustment motor 4081. An adjustment screw 4084 is also connected to one of the adjustment pulleys 4082. The adjustment screw 4084 is connected to the guide rail 403 near the first side plate 402 through an adjustment screw sleeve 4087. An adjustment slider 4086 is installed at the bottom of the guide rail 403, and the adjustment slider 4086 is connected to an adjustment screw mounted on the base 401. When the distance between the conveying troughs 4031 and the slide rail 4085 is adjusted, the adjusting motor 4081 is started. The adjusting motor 4081 drives the guide rail 403 to slide on the adjusting slide rail 4085 through the adjusting screw 4084, thereby realizing the adjustment of the distance between the two guide rails 4031 to increase or decrease. In this embodiment, in order to ensure the smooth adjustment of the guide rail 403, an adjusting screw 4084 is also provided between the first side plate 402 and the guide rail 403 at the other end of the adjusting motor 4081. The adjusting screw 4084 is also rotatably set between the first side plate 402 and the outer guide rail 403. The end of the adjusting screw 4084 is provided with a pair of adjusting belt pulleys 4082 connected by the second connecting belt 4088. The two ends of the guide rail 403 slide in a balanced manner through the linkage of the second connecting belt 4088.

[0041] In this system, an end sensor 410 is provided at each end of the guide rail table 403. One end sensor 410 is used to sense the starting point of receiving the PCBA board 900, and the other end sensor 410 is used to sense the PCBA board 900 after being received and detected by the subsequent lifting mechanism 700. The guide rail table 403 is provided with a first conveying sensor 409 on the detection position side. After the PCBA board 900 pushed by the material transfer mechanism 500 is pushed by the L-shaped push plate 4051 of the transfer unit 405, when the L-shaped push plate 4051 reaches the first conveying sensor 409, the PCBA board 900 reaches the preset detection position, thereby realizing the detection and feeding of the PCBA board 900 from the conveying groove 4031.

[0042] Reference Figure 10The material transfer mechanism 500 includes two oppositely arranged conveying units 503. Each conveying unit 503 includes a conveying frame 5031. Driven synchronous pulleys 5034 are rotatably mounted on the side walls at both ends of the conveying frame 5031. A power transmission unit 502 is provided in the middle of the conveying frame 5031. A material transfer motor 501 is connected to the power transmission unit 502 for driving. The power transmission unit 502 and the driven synchronous pulleys 5034 are connected by a second synchronous belt 5033. A limiting plate 5032 is also provided on the upper part of the conveying frame 5031. The limiting plate 5032 between the two conveying frames 5031 forms a material transfer groove that can limit the position of the material box 800. The material transfer groove can thus limit the transfer of the material box 800, realize the positioning transfer of the material box 800, and prevent the material box 800 from tipping over. The two conveying frames 5031 are... The adjustment settings include a second adjusting slider 506 installed at the bottom of one of the conveyor frames 5031, which slides in cooperation with a second adjusting slide rail 505 installed in the inner frame 200. There is a pair of second adjusting slide rails 505, and a fixed seat 508 fixed in the inner frame 200 is provided between the pair of second adjusting slide rails 505. A dovetail groove 5081 is opened on the fixed seat 508, and a positioning bolt 507 is provided on the dovetail groove 5081. The positioning bolt 507 fixes the conveyor frame 5031 after adjustment and positioning through the positioning block 509. A material transfer sensor 504 is provided between the conveyor units 503 to sense the loading or unloading status of the material transfer mechanism 500, thereby ensuring the positioning output of the PCBA board 900 after the material box 800 is positioned, conveyed or detected by the material transfer mechanism 500.

[0043] Reference Figure 11 The power transmission unit 502 includes a second hexagonal drive shaft 5021 connected to the material transfer motor 501 and a bushing 5023 sleeved on the second hexagonal drive shaft 5021. The bushing 5023 has a hexagonal groove corresponding to the second hexagonal drive shaft 5021 inside. A protruding bushing retainer 5023a is provided on the bushing 5023. A drive synchronizing pulley 5022 and a bearing 5024 are sleeved on the bushing 5023. The drive synchronizing pulley 5022 and the bearing 5024 are separated by the bushing retainer 5023a. The two ends of the sleeve 5023 are also provided with fixing slots 5023b. An elastic clamp 5025 is sleeved inside the fixing slot 5023b. The elastic clamp 5025 fixes the drive synchronous pulley 5022 or the bearing 5024. A locking block 5027 is sleeved on the outside of the bearing 5024. A retaining ring 5026 is provided between the locking block 5027 and the bearing 5024. The locking block 5027 is fixedly connected to the conveyor frame 5031. After the locking block 5027 is fixedly connected, the drive synchronous pulley 5022 is connected to the second synchronous belt 5033 for transmission.

[0044] Reference Figure 13The lifting mechanism 700 includes a first linear module 701, which is connected between the upper and lower material transfer mechanisms 500. The first linear module 701 has a vertically sliding lifting slide plate 702. A second linear module 703 is mounted on the lifting slide plate 702. The second linear module 703 is horizontally positioned, and a receiving plate 704 is mounted on its sliding plate. A clamping cylinder 705 is mounted on the receiving plate 704, and a clamping plate 706 is mounted on the telescopic rod end of the clamping cylinder 705. A clamping structure is formed between the receiving plate 704 and the clamping plate 706 to clamp and fix the material supply box 800 or PCBA board 900. During material loading, the first linear module 701 makes the receiving plate 704 the same height as the transmission surface of the upper material transfer mechanism 500, and the second linear module 703 moves the clamping structure onto the material transfer mechanism 500 to transfer the material at one end. When the material box 800 is clamped and moved to the position of the conveying mechanism 400, and the material box 800 is empty, the receiving plate 704 is made to be at the same height as the transmission surface of the lower material transfer mechanism 500 by the first linear module 701, and the clamping structure is moved to the transmission surface of the lower material transfer mechanism 500 by the second linear module 703, and the clamped empty material box 800 is moved to the lower material transfer mechanism 500. When unloading, the clamping structure clamps the detected PCBA board 900, the receiving plate 704 is made to be at the same height as the corresponding transmission surface of the material transfer mechanism 500 by the first linear module 701, and the clamping structure is moved to the material transfer mechanism 500 by the second linear module 703. The qualified PCBA board 900 is placed on the upper material transfer mechanism 500 on the unloading end side, and the unqualified PCBA board 900 is placed on the lower material transfer mechanism 500 on the unloading end side.

[0045] On the upper part of the feeding end side of the material conveying mechanism 500, a pusher mechanism 600 is also provided, as shown in the reference. Figure 12 The push plate mechanism 600 includes a push plate base 601 and a push plate motor 602. Pulleys 603 are mounted at both ends of the push plate base 601 and are connected by a push plate belt 604. One of the pulleys 603 is coaxially connected to the push plate motor 602. A belt clamping block 605 is provided on the push plate belt 604, and a connecting seat 606 is connected to the belt clamping block 605. A push plate slider 607 is connected to the connecting seat 606. The upper part is also provided with a push plate slide rail 608, and the push plate slider 607 slides in cooperation with the push plate slide rail 608. A push plate 609 parallel to the push plate seat 601 is installed on the connecting seat 606. The push plate motor 602 causes the push plate slider 607 to slide on the push plate slide rail 608. The push plate 609 pushes out and pushes the PCBA board 900 in the material box 800 clamped on the lifting mechanism 700 out of the material box 800 and positioned on the conveying groove 4031 of the conveying mechanism 400.

[0046] The above embodiments merely illustrate implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A third-stage optical inspection device, comprising a chassis (100), wherein an internal frame (200) is provided inside the chassis (100), the internal frame (200) includes an upper mounting surface (201), an inspection mechanism (300) is mounted on the upper part of the upper mounting surface (201) and a conveying mechanism (400) passing through the lower part of the inspection mechanism (300), the conveying mechanism (400) having material transfer mechanisms (500) for loading or unloading PCBA boards (900) connected to both ends, characterized in that: The detection mechanism (300) includes a detection seat (301) mounted on the upper mounting surface (201). The detection seat (301) is provided with a first horizontal linear module (302) parallel to the transmission direction of the conveying mechanism (400). The first horizontal linear module (302) includes a pair of transverse supports (3021). A first slide rail (3022) is provided on the upper part of each transverse support (3021). A slidable first sliding seat (3023) is mounted on the first slide rail (3022). A second horizontal linear module (303) perpendicular to the first horizontal linear module (302) is provided between the first sliding seats (3023). The second horizontal linear module (303) includes components mounted on the first sliding seat. A support beam (3031) is provided between the seats (3023). A second slide rail (3032) is installed on the side wall of the support beam (3031). A connecting unit (304) is provided on the second slide rail (3032). The connecting unit (304) includes a connecting platform (3041) and a detection support plate (3042) connected to the connecting platform (3041). An upper fixing plate (3045) and a lower fixing plate (3048) are fixed on the upper and lower sides of the detection support plate (3042). A first CCD camera (305) is installed between the upper fixing plate (3045) and the lower fixing plate (3048) through a first connecting frame (3051). The first CCD camera (305) is a high-resolution camera with a resolution of 0.The detection support plate (3042) is provided with a vertical third slide rail (3044), and a sliding plate (3046) is slidably provided on the third slide rail (3044). A second connecting frame (3061) is installed on the sliding plate (3046), and a second CCD camera (306) is installed on the second connecting frame (3061). The second CCD camera (306) is a medium resolution camera with a resolution of 10-50 micrometers. The connecting platform (3041) is provided with a fine-tuning servo motor (307). 7) A lead screw (3073) is connected to the rotating shaft. The lead screw (3073) is rotatably supported on the detection support plate (3042) by a pair of support blocks (3071). The lead screw (3073) is connected to a connecting block (3072) between the pair of support blocks (3071) by a lead screw sleeve (3074). The connecting block (3072) is connected to the sliding plate (3046). Through the first horizontal linear module (302) and the second horizontal linear module (303), the first CCD camera (305) or the second CCD camera (306) can realize Now, optical inspection of the PCBA board (900) on the horizontal plane is performed on the conveying mechanism (400). During the product inspection process, the first CCD camera (305) is at a fixed height to achieve high-precision static measurement on the plane. The second CCD camera (306) performs normal optical inspection of the PCBA board (900) on the horizontal plane at the inspection position. By means of the fine-tuning servo motor (307) for fine-tuning the sliding of the lead screw (3073), the second CCD camera (306) can achieve inspection of the PCBA board (900) on the conveying mechanism (400) at different heights. The ordinary optical inspection, the second CCD camera (306) realizes dynamic medium-precision measurement on the three-dimensional surface, and the combination of the first CCD camera (305) and the second CCD camera (306) achieves the coordination of three-dimensional dynamic and planar static "one dynamic and one static". The three-dimensional dynamic inspection ensures that the equipment can quickly and comprehensively inspect the product and lock the possible defective areas or defects of the product. The planar static inspection further conducts high-precision inspection on the locked defective areas or defects of the product, ensuring that the inspection agency (300) has full coverage of the inspection of the PCBA board (900). The conveying mechanism (400) includes a base (401), on which a first side plate (402) and a pair of guide rails (403) are provided. The first side plate (402) and the pair of guide rails (403) are parallel to each other. A falling conveying groove (4031) is provided on the guide rail (403). A sliding groove for positioning and moving the PCBA board (900) is formed between the conveying grooves (4031) of the pair of guide rails (403). A pressure plate (404) is provided on the guide rail (403) below the detection mechanism (300). 404) is an elastic silicone plate. The pressure plate (404) and the conveying groove (4031) form a detection position for the PCBA board (900) during testing. Below the detection position between the guide rails (403), there is a clamping cylinder (406). The clamping cylinder (406) clamps the PCBA board (900) from the bottom. During testing, the clamping cylinder (406) applies different clamping forces to the PCBA board (900), so that the height of the PCBA board (900) can be adjusted by 0.05~0.2 mm when it is against the pressure plate (404).

2. The third optical detection device according to claim 1, characterized in that: The front end of the chassis (100) is provided with multiple openable windows corresponding to the material transfer mechanism (500), including a first window (102), a second window (103), a third window (104), and a fourth window (105). The first window (102) corresponds to the upper material transfer mechanism (500) at the feeding end and is used to feed the material box (800) with PCBA board (900). The third window (104) corresponds to the lower material transfer mechanism (500) at the feeding end. The second window (103) is used to collect and receive empty material boxes (800). The upper material transfer mechanism (500) at the unloading end is used to collect qualified PCBA boards (900). The fourth window (105) is used to collect unqualified PCBA boards (900) at the lower material transfer mechanism (500) at the unloading end. The front end of the chassis (100) is also equipped with a detection control panel (101) for observing or controlling the optical detection operation of PCBA boards (900).

3. The third optical detection device according to claim 2, characterized in that: The first side plate (402) is provided with a belt drive unit (407), which includes a drive motor (4071) and two drive pulleys (4072). The two drive pulleys (4072) are connected by a first belt (4073). One of the drive pulleys (4072) is connected to the power shaft of the drive motor (4071), and one of the drive pulleys (4072) is connected to a first hexagonal drive shaft (4074). The first hexagonal drive shaft (4074) is rotatably connected between the first side plate (402) and a pair of guide rails (403). The first hexagonal drive shaft (4074) has a first synchronous pulley (4075) mounted on the outside of the guide rails (403). The first synchronous pulley (4075) is connected to the other end of the guide rails (403) by a first synchronous belt (4076). 76) A transfer unit (405) is connected to the upper part. The transfer unit (405) includes two pairs of L-shaped push plates (4051). The two pairs of L-shaped push plates (4051) are located between the guide rail table (403). The two pairs of L-shaped push plates (4051) are provided with stops (4051a). The L-shaped push plates (4051) are movable up and down. When the L-shaped push plates (4051) fall, the stops (4051a) fall into the conveying groove (4031). Below, the L-shaped push plate (4051) is hidden between the guide rails (403). When the L-shaped push plate (4051) is raised, the stop block (4051a) is higher than the conveying groove (4031). The stop block (4051a) moves the PCBA board (900) between the conveying grooves (4031) from one end of the feeding direction to the detection position, or the stop block (4051a) moves the PCBA board (900) on the detection position to one end of the unloading direction.

4. The third optical detection device according to claim 3, characterized in that: The L-shaped push plate (4051) has an extension (4051b) at its lower part. The extension (4051b) extends from the inner side of the guide rail (403) to the outer side of the guide rail (403). A cylinder guide rail (4055) is provided on the outer side wall of the guide rail (403). A pressing cylinder (4052) is slidably connected to the cylinder guide rail (4055), and the extension (4051b) is connected to the telescopic rod end of the pressing cylinder (4052). The two L-shaped push plates on the same side... The pressing cylinder (4052) on the push plate (4051) is connected together by the connecting plate (4053). The connecting plate (4053) is provided with a first clamping block (4054). The first clamping block (4054) clamps and connects to the first synchronous belt (4076). Driven by the belt drive unit (407), the first synchronous belt (4076) rotates. The two pairs of L-shaped push plates (4051) connected in the front and rear synchronously push the PCBA board (900) on the conveying groove (4031).

5. The third optical detection device according to claim 4, characterized in that: An end sensor (410) is provided at each end of the guide rail table (403). One end sensor (410) is used to sense the starting point of receiving the PCBA board (900), and the other end sensor (410) is used to sense the subsequent lifting mechanism (700) receiving the PCBA board (900) after detection. The guide rail table (403) is provided with a first conveying sensor (409) on the detection position side. After the PCBA board (900) pushed by the material transfer mechanism (500) is pushed by the L-shaped push plate (4051) of the transfer unit (405), when the L-shaped push plate (4051) reaches the first conveying sensor (409), the PCBA board (900) reaches the preset detection position, thereby realizing the detection and feeding of the PCBA board (900) from the conveying groove (4031).

6. The third optical detection device according to claim 5, characterized in that: The material transfer mechanism (500) includes two oppositely arranged conveying units (503). Each conveying unit (503) includes a conveying frame (5031). Driven synchronous pulleys (5034) are rotatably mounted on the side walls at both ends of the conveying frame (5031). A power transmission unit (502) is provided in the middle of the conveying frame (5031). A material transfer motor (501) is connected to the power transmission unit (502) for driving. The power transmission unit (502) and the driven synchronous pulleys (5034) are connected by a second synchronous belt (5033). The upper part is also provided with a limiting plate (5032). The limiting plate (5032) between the two conveyor frames (5031) forms a material transfer groove that can limit the material box (800). The two conveyor frames (5031) are adjustable. A second adjusting slider (506) is installed at the bottom of one of the conveyor frames (5031). The second adjusting slider (506) slides in cooperation with the second adjusting slide rail (505) installed on the inner frame (200). There is a pair of second adjusting slide rails (505). A fixed part is provided between the pair of second adjusting slide rails (505) on the inner frame (200). The fixed base (508) of the conveyor frame (5031) is provided with a dovetail groove (5081) and a positioning bolt (507) on the dovetail groove (5081). The positioning bolt (507) is fixed to the conveyor frame (5031) after adjustment and positioning by the positioning block (509). The conveyor units (503) are provided with material transfer sensors (504) to sense the loading or unloading status of the material transfer mechanism (500) to ensure the positioning output of the PCBA board (900) after the material box (800) is positioned, conveyed or detected by the material transfer mechanism (500); the material transfer mechanism (500) There are two pairs of conveying mechanisms (500), which are respectively located at the loading end and unloading end of the conveying mechanism (400). Each pair of conveying mechanisms (500) is arranged vertically between each other and connected by a lifting mechanism (700) between the upper and lower conveying mechanisms (500). The upper part of the conveying mechanism (500) at the loading end is used to load the material box (800) with PCBA board (900) and the lower part is used to collect and receive the empty material box (800). The upper part of the conveying mechanism (500) at the unloading end is used to collect qualified PCBA board (900) and the lower part is used to collect unqualified PCBA board (900).

7. The third optical detection device according to claim 6, characterized in that: The lifting mechanism (700) includes a first linear module (701), which is connected between the upper and lower material transfer mechanisms (500). The first linear module (701) has a vertically sliding lifting slide plate (702). A second linear module (703) is mounted on the lifting slide plate (702). The second linear module (703) is horizontally positioned, and a receiving plate (704) is mounted on the sliding plate of the second linear module (703). A clamping cylinder (705) is installed on the receiving plate (704). A clamping plate (706) is installed on the telescopic rod end of the clamping cylinder (705). A clamping structure is formed between the receiving plate (704) and the clamping plate (706) to clamp and fix the feeding box (800) or PCBA board (900). When feeding, the receiving plate (704) is made to be at the same height as the transmission surface of the upper material transfer mechanism (500) by the first linear module (701). The clamping structure is moved to the material transfer machine by the second linear module (703). The material box (800) at one end of the conveyor (500) is clamped and moved to the position of the conveying mechanism (400). When the material box (800) is empty, the receiving plate (704) is made to be at the same height as the conveying surface of the lower conveying mechanism (500) by the first linear module (701), and the clamping structure is moved to the conveying surface of the lower conveying mechanism (500) by the second linear module (703), and the clamped empty material box (800) is moved onto the lower conveying mechanism (500); when unloading, the clamping structure... The inspected PCBA board (900) is clamped, and the receiving board (704) is aligned with the transmission surface of the corresponding material transfer mechanism (500) by the first linear module (701). The clamping structure is moved onto the material transfer mechanism (500) by the second linear module (703). Qualified PCBA boards (900) are placed on the upper material transfer mechanism (500) on the unloading end side, and unqualified PCBA boards (900) are placed on the lower material transfer mechanism (500) on the unloading end side.

8. The third optical detection device according to claim 7, characterized in that: The conveying mechanism (400) further includes a pitch adjustment unit (408), which is used to automatically adjust the spacing between the conveying troughs (4031). The pitch adjustment unit (408) includes a pitch adjustment motor (4081) mounted on the first side plate (402) and a pair of pitch adjustment pulleys (4082) rotatably mounted on the first side plate (402). The pair of pitch adjustment pulleys (4082) are connected by a first connecting belt (4083). One of the pitch adjustment pulleys (4082) is coaxially connected to the pitch adjustment motor (4081). An adjusting screw (4084) is also connected to one of the pitch adjustment pulleys (4082). The adjusting screw (4084) is connected to the guide rail platform (403) near the first side plate (402). An adjusting slider (4086) is also mounted on the bottom of the guide rail platform (403), and the adjusting slider (4086) is mounted on the base (401). The adjustable slide rail (4085) is slidably connected. When adjusting the distance between the conveying troughs (4031), the adjustable motor (4081) is started. The adjustable motor (4081) drives the guide rail (403) to slide on the adjustable slide rail (4085) through the adjusting screw (4084), thereby realizing the adjustment of the distance between the two guide rails (4031) between the conveying troughs (4031) to increase or decrease. The guide rails (403) correspond to the other end of the adjustable motor (4081). An adjusting screw (4084) is also provided between the first side plate (402) and the guide rail (403). The adjusting screw (4084) is also rotatably disposed between the first side plate (402) and the outer guide rail (403). The end of the adjusting screw (4084) is provided with a pair of adjustable pulleys (4082) connected by a second connecting belt (4088). Through the linkage of the second connecting belt (4088), the two ends of the guide rail (403) can achieve balanced sliding.

9. The third optical detection device according to claim 8, characterized in that: The power transmission unit (502) includes a second hexagonal drive shaft (5021) connected to the material transfer motor (501) and a bushing (5023) sleeved on the second hexagonal drive shaft (5021). The bushing (5023) has a hexagonal groove corresponding to the second hexagonal drive shaft (5021) inside. The bushing (5023) has a protruding bushing retainer (5023a). A drive synchronizing pulley (5022) and a bearing (5024) are sleeved on the bushing (5023). The drive synchronizing pulley (5022) and the bearing (5024) are separated by the bushing retainer (5023a). 23) is also provided with fixed slots (5023b) at both ends. An elastic clamp (5025) is provided inside the fixed slot (5023b). The elastic clamp (5025) fixes the active synchronous pulley (5022) or the bearing (5024). A locking block (5027) is provided outside the bearing (5024). A retaining ring (5026) is provided between the locking block (5027) and the bearing (5024). The locking block (5027) is fixedly connected to the conveyor frame (5031). After the locking block (5027) is fixedly connected, the active synchronous pulley (5022) is connected to the second synchronous belt (5033) for transmission.

10. The third optical detection device according to claim 9, characterized in that: On the upper part of the feeding end side of the material conveying mechanism (500), a push plate mechanism (600) is also provided. The push plate mechanism (600) includes a push plate base (601) and a push plate motor (602). Pulleys (603) are installed at both ends of the push plate base (601). The pulleys (603) are connected to each other by a push plate belt (604). One of the pulleys (603) is coaxially connected to the push plate motor (602). A belt clamping block (605) is provided on the push plate belt (604). The belt clamping block (605) is connected to a connecting seat (606). The connecting seat (606) is connected to... A push plate slider (607) is connected, and a push plate slide rail (608) is also provided on the upper part of the push plate seat (601). The push plate slider (607) and the push plate slide rail (608) are slidably engaged. A push plate (609) parallel to the push plate seat (601) is installed on the connecting seat (606). The push plate motor (602) causes the push plate slider (607) to slide on the push plate slide rail (608). The push plate (609) pushes out and pushes the PCBA board (900) clamped on the lifting mechanism (700) out of the material box (800) and positioned on the conveying groove (4031) of the conveying mechanism (400).

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