Automatic optical equipment for detecting miniature PCB (Printed Circuit Board)

Abstract

The utility model relates to detection equipment, in particular to automatic optical equipment for detecting a miniature PCB (Printed Circuit Board). The automatic optical equipment for detecting the miniature PCB comprises a bottom plate, a mounting frame, a guide seat, an optical detector and the like, a mounting frame is fixedly connected to the bottom plate, the mounting frame is composed of guide seats symmetrically arranged on the upper side and the lower side and connecting plates arranged on the front side and the rear side, and optical detectors are arranged on the guide seats in a sliding mode. When the miniature circuit board detection device is used for detecting miniature circuit boards, a plurality of circuit boards can be placed in order at a time by arranging a plurality of board placing grooves in the insertion frame in order, and the upper surfaces and the lower surfaces of the circuit boards on the insertion frame are detected in order through the two optical detectors which move intermittently and the synchronous belt group which is conveyed intermittently. And the circuit boards can be quickly, effectively and automatically detected in batches without manually placing and turning over the boards by workers, so that the detection efficiency is greatly improved.

Description

Technical Field

[0001] This utility model relates to a testing device, and more particularly to an automated optical device for testing miniature PCB boards. Background Technology

[0002] Automated Optical Inspection (AOI) is a visual inspection technology widely used in the electronics manufacturing industry to improve product quality by effectively identifying defects in the manufacturing process. This technology combines advanced optics, cameras, and image processing capabilities for inspection. AOI is renowned for its speed and accuracy, making it a vital tool in various industries such as automotive, consumer electronics, and medical device manufacturing, helping to maintain high-quality standards.

[0003] Chinese patent application CN202322094128.6 discloses a circuit board optical inspection device, including a support module, a drive module, a detection module, and a carrier module. The drive module and the detection module are both mounted on the support module, and the carrier module is mounted on the drive module. The support module includes a detection station and support feet, with the support feet fixedly mounted on the detection station. The drive module includes a first drive unit and a second drive unit, with the first drive unit mounted on the detection station and the second drive unit mounted on the first drive unit. This circuit board optical inspection device automatically performs optical appearance inspection on circuit boards using the support module, drive module, detection module, and carrier module to determine whether the circuit boards have common defects. It has advantages such as stable structure, high efficiency, and high practicality. However, during inspection, the device requires manual placement and flipping of the boards, resulting in low efficiency when batch inspection of circuit boards is required. Utility Model Content

[0004] To overcome the shortcomings of existing devices that require manual placement and flipping of circuit boards during circuit board inspection, which cannot meet the requirements of batch inspection of PCB boards when the number of circuit boards to be inspected is large and have low efficiency, the purpose of this utility model is to provide an automated optical device for micro PCB board inspection that can quickly and effectively perform batch inspection of circuit boards without manual placement and flipping of boards, greatly improving the inspection efficiency.

[0005] The technical solution is as follows: An automated optical device for inspecting miniature PCB boards includes a base plate, a mounting frame, guide seats, a screen, a transmission group, an optical inspector, a fixing plate, a bracket, a synchronous belt group, and a drive motor. The mounting frame is fixedly connected to the base plate. The mounting frame consists of guide seats symmetrically arranged on the upper and lower sides and connecting plates on the front and rear sides. Optical inspectors are slidably mounted on each guide seat, and a transmission group is installed on each guide seat. The transmission group consists of a drive motor and a lead screw. The lead screw of the transmission group is threadedly connected to the optical inspector. Driven by the drive motor, the lead screw moves the optical inspector back and forth. A screen is fixedly mounted on the upper front side of the mounting frame. Fixing plates are fixedly connected to the upper front and rear sides of the base plate. The two fixing plates are symmetrically arranged, and synchronous belt groups are installed inside each fixing plate. Each synchronous belt group consists of two synchronous pulleys and a synchronous belt rotatably mounted on the left and right sides of the fixing plate. The drive motor is mounted on the front fixing plate, and the output shaft of the drive motor is fixedly connected to the right synchronous pulley of the front synchronous belt group. A bracket is placed between the fixing plates, with its front and rear sides contacting the synchronous belt groups on the front and rear sides, respectively.

[0006] Optionally, it also includes a fixed frame, an electric cylinder, a pusher frame, and a feeding plate. The fixed frame is fixedly connected to the right side of the base plate, the electric cylinder is fixedly installed on the right side of the fixed frame, the pusher frame is fixedly connected to the movable rod of the electric cylinder, and the feeding plate is fixedly connected to the upper part of the pusher frame.

[0007] Optionally, it also includes a rotary cylinder, a rotary plate, a feeding motor, and rollers. A rotary cylinder is installed on the right side of each fixed plate, a rotary plate is installed on the rotary clamping block of each rotary cylinder, a feeding motor is provided on the right side of each rotary plate, and rollers are installed on the output shaft of each feeding motor.

[0008] Optionally, it also includes a fixing block, an air pipe and a jet head. Fixing blocks are welded to both the upper and lower sides of the fixing plate, and an air pipe is provided between the fixing blocks on the same side. Each air pipe is connected to and connected to at least three jet heads.

[0009] Optionally, it also includes positioning plates, with positioning plates welded to both the front and rear sides of the feeding plate.

[0010] Optionally, the top and front sides of the socket are provided with raised ribs, and the bottom and front sides of the socket are provided with grooves.

[0011] Beneficial effects: When inspecting miniature PCBs, this utility model achieves the one-time neat placement of multiple PCBs by neatly setting multiple placement slots in the insertion rack. The upper and lower sides of the PCBs on the insertion rack are inspected in an orderly manner by two intermittently moving optical inspection instruments and an intermittently conveying synchronous belt group. When inspecting PCBs, there is no need for workers to manually place and flip the boards, which can quickly and effectively perform batch inspection of PCBs, greatly improving the inspection efficiency.

[0012] This invention automatically feeds stacked inserts onto a feeding plate by storing multiple inserts and using a combination of electric and rotary cylinders. This eliminates the need for manual intervention, precisely moving the inserts onto the conveyor and completing the stacking task in a short time. It also enables fast, accurate, and continuous feeding, greatly improving work efficiency and reducing feeding time and labor costs. After the PCB board is inspected by an optical inspection instrument, it is unloaded via a synchronous belt. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a three-dimensional structural diagram of the present invention with the feeding mechanism concealed.

[0015] Figure 3 This is a three-dimensional structural diagram of the mounting bracket and transmission group optical inspection instrument of this utility model.

[0016] Figure 4 This is a three-dimensional structural diagram of the insert holder of this utility model.

[0017] Figure 5 This is a three-dimensional structural diagram of the feeding mechanism of this utility model.

[0018] Figure 6 This is a three-dimensional structural diagram of the feeding plate and positioning plate of this utility model.

[0019] The meanings of the reference numerals in the figure are as follows: 1: base plate, 2: mounting bracket, 21: guide seat, 22: screen, 3: transmission group, 4: optical inspection instrument, 5: fixing plate, 51: insert bracket, 6: synchronous belt group, 61: drive motor, 7: fixing block, 71: air pipe, 8: jet nozzle, 9: fixing bracket, 10: electric cylinder, 101: push frame, 11: feeding plate, 12: positioning plate, 13: rotary cylinder, 14: rotating plate, 15: feeding motor, 16: roller. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0021] Example 1: An automated optical device for inspecting miniature PCB boards, such as... Figure 1-6As shown, the system includes a base plate 1, a mounting bracket 2, guide seats 21, a screen 22, a transmission assembly 3, an optical detector 4, a fixing plate 5, a bracket 51, a synchronous belt assembly 6, and a drive motor 61. The mounting bracket 2 is fixedly connected to the base plate 1. The mounting bracket 2 consists of guide seats 21 symmetrically arranged on the upper and lower sides and connecting plates on the front and rear sides. Optical detectors 4 are slidably mounted on each guide seat 21. A transmission assembly 3 is mounted on each guide seat 21. The transmission assembly 3 consists of a drive motor and a lead screw. The lead screw of the transmission assembly 3 is threadedly connected to the optical detector 4. Driven by the drive motor, the lead screw moves the optical detector 4 on the same side back and forth. The guide seat 21 is equipped with guide rods on both the left and right sides. The two guide rods on the guide seat 21 pass through the left and right sides of the optical inspection instrument 4 on the same side. The screen 22 is fixedly installed on the upper front side of the mounting bracket 2. The optical inspection instrument 4 is connected to the screen 22 via a signal. When the optical inspection instrument 4 is working, it scans and acquires images through the optical lens to detect the solder joints, appearance, etc. of the PCB board, and compares them with the qualified parameters in the database in the screen 22. After image processing, it detects the defects on the PCB board. The base plate 1 is fixedly connected to the front and rear sides of the upper part with two fixing plates 5. The two fixing plates 5 are symmetrically arranged, and the fixing plates 5 have a protrusion in the middle. Each of the fixed plates 5 is equipped with a synchronous belt assembly 6, which consists of two synchronous pulleys and a synchronous belt rotatably mounted on the left and right sides of the fixed plate 5. A drive motor 61 is mounted on the front fixed plate 5, and its output shaft is fixedly connected to the right synchronous pulley of the front synchronous belt assembly 6. An insert bracket 51 is placed between the fixed plates 5. The insert bracket 51 has a perforated plate with multiple evenly spaced slots for placing PCBs. The size of the slots matches the size of the miniature PCB to be placed. When placing the PCB, the slots will hold the PCB around its perimeter. The front and rear sides of the insert bracket 51 are respectively connected to the synchronous pulleys on the front and rear sides. When the timing belt group 6 contacts and the insert 51 is placed between the timing belt groups 6, it is squeezed by the two timing belts. When the timing belt group 6 on the front side rotates, it will drive the insert 51 to move under friction and rolling. The timing belt group on the rear side will rotate synchronously. When transferring materials, the friction between the insert 51 and the timing belt group on the rear side is increased. At the same time, the friction between the insert 51 and the fixed plate 5 is reduced through rolling transmission. When the insert 51 is transferred to the left, it will pass between the two optical inspection instruments 4. The optical lenses of the optical inspection instruments 4 are all facing the insert 51. By setting two optical inspection instruments 4, the PCB board on the insert 51 is inspected on both the top and bottom sides at the same time.

[0022] Initially, the optical inspection instrument 4 is positioned at the front limit of the guide seat 21 and the transmission group 3. When inspecting the PCB board, multiple miniature PCB boards to be inspected are arranged and placed in the placement slot of the insert 51. The placement slot will hold the PCB boards in place. Then, the drive motor 61 is started. The drive motor 61 rotates, driving the front synchronous belt group 6 to rotate. The drive motor 61 rotates counterclockwise, causing the synchronous belt of the front synchronous belt group 6 to flow counterclockwise. The left end of the insert 51 with the PCB boards placed is placed between the right side of the synchronous belt group 6. The front and rear sides of the insert 51 will be in contact with the synchronous belt groups on both sides. The timing belts of the two timing belts will exert a certain amount of pressure on the insert 51, and the friction between the timing belt group 6 and the insert 51 is relatively large. The bottom of the insert 51 contacts the fixed plate 5. When the timing belt group 6 on the front side rotates under the operation of the drive motor 61, it will move the insert 51 to the left. Simultaneously, under the friction of the movement of the insert 51, the timing belt group 6 on the rear side will rotate clockwise. The insert 51 starts to be conveyed to the right. During the conveying process, the left end of the insert 51 will move between the two optical detectors 4. When the first row of the left row of the insert 51 moves to the upper and lower optical detectors 4... At this time, the drive motor 61 stops running, the insert holder 51 stops moving, and the optical inspection instrument 4, driven by the transmission group 3, moves slowly forward to perform optical inspection on the PCB boards in the placement slot. The images and results of the inspection are displayed on the screen 22. When the optical inspection instrument 4 passes the rear of the insert holder 51, the transmission group 3 stops working. At this time, all the PCB boards in the first row on the left side of the insert holder 51 have been inspected. The drive motor 61 continues to drive the synchronous belt group 6 to intermittently transport the insert holder 51 to the left, cooperating with the intermittently moving optical inspection instrument 4 to inspect all the PCB boards in the insert holder 51. Detailed inspection is performed by neatly arranging multiple board placement slots within the insertion rack 51, allowing multiple PCB boards to be placed in a single, orderly manner. Two intermittently moving optical inspection instruments 4 and an intermittently conveying synchronous belt group 6 are used to systematically inspect both the top and bottom surfaces of the PCB boards on the insertion rack 51. During PCB board inspection, there is no need for workers to manually place and flip the boards, enabling rapid and efficient automatic batch inspection of PCB boards, greatly improving inspection efficiency. After the rightmost row of PCB boards in the insertion rack 51 has been inspected, the insertion rack 51 moves to the left under the conveyor of the synchronous belt group 6 to unload the boards, completing the inspection work.

[0023] Example 2: Based on Example 1, such as Figure 1 , Figure 5 and Figure 6As shown, it also includes a fixed frame 9, an electric cylinder 10, a pusher frame 101, and a loading plate 11. The fixed frame 9 is fixedly connected to the right side of the base plate 1. The electric cylinder 10 is fixedly installed on the lower right side of the fixed frame 9. The movable rod of the electric cylinder 10 passes through the right side of the fixed frame 9. The pusher frame 101 is fixedly connected to the movable rod of the electric cylinder 10. When the movable rod of the electric cylinder 10 is fully retracted, the bottom side of the pusher frame 101 will contact the fixed frame 9. The loading plate 11 is fixedly connected to the upper part of the pusher frame 101. The extension distance of the movable rod of the electric cylinder 10 can be precisely adjusted. When the loading plate moves up and down, it can be precisely stopped at the required position. The loading plate 11 is used to stack multiple inserts 51 at one time. PCB boards are placed in the stacked inserts 51. The loading plate 11 is set on the transverse center line in the middle between the synchronous belt groups 6.

[0024] like Figure 1-2 As shown, it also includes a rotary cylinder 13, a rotary plate 14, a feeding motor 15, and rollers 16. A rotary cylinder 13 is installed on the right side of the fixed plate 5. A rotary plate 14 is installed on the rotary clamping block of the rotary cylinder 13. Under the drive of the two rotary cylinders 13, the two rotary plates 14 will rotate synchronously inward. A feeding motor 15 is provided on the right side of the rotary plate 14. When the two feeding motors 15 are working, they rotate in opposite directions. Rollers 16 are installed on the output shaft of the feeding motors 15. The installation angle of the rotary cylinder 13 should be set according to the rotation stroke. After the rotary clamping block rotates, the two rollers 16 just press against the insert 51. The two rollers 16 set in front and behind will contact the front and rear sides of the top layer of inserts 51 stacked on the feeding plate 11 with the rotation of the rotary plate 14. When the feeding motor 15 is working, it will drive the two rollers 16 to push the inserts that are pressed against each other on the inside to the left.

[0025] like Figure 1-2 As shown, it also includes a fixing block 7, an air pipe 71, and a jet nozzle 8. Fixing blocks 7 are welded to both the upper and lower sides of the fixing plate 5. An air pipe 71 is provided between the fixing blocks 7 on the same side. Each air pipe 71 has an air connector for connecting to an external high-pressure air source. Each air pipe 71 is connected to and has at least three jet nozzles 8. The high-pressure air source will be blown out through the jet nozzles 8, and the airflow speed is relatively fast. The air outlets of the jet nozzles 8 are all facing one side of the fixing plate 5. The airflow blown out by the jet nozzles 8 on the upper and lower sides will blow towards the upper and lower sides of the insertion bracket 51 of the synchronous belt group 6, and clean the upper and lower surfaces of the PCB board inside the insertion bracket 51.

[0026] like Figure 1 and Figure 6 As shown, it also includes a positioning plate 12. Positioning plates 12 are welded on both the front and rear sides of the feeding plate 11. They are used to position the insert 51 during feeding. When the insert 51 is placed on the feeding plate, it will be placed between the two positioning plates 12. When the insert 51 of the positioning plate 12 is pushed to the left, it will be accurately pushed into the synchronous belt group 6.

[0027] Initially, the movable rod of the electric cylinder 10 is in the retracted state, the synchronous belt group 6 on the front side is in the conveying state, and the air pipe 71 is connected to an external high-pressure air source. The high-pressure airflow is blown out through the jet nozzle 8. When the PCB board needs to be inspected, firstly, multiple PCB board holders 51 are neatly stacked between the positioning plates 12 of the loading plate 11 for waiting. When the PCB board needs to be inspected, the electric cylinder 10 starts to work. The electric cylinder 10 extends its movable rod. When the bottom side of the topmost holder 51 on the loading plate 11 moves to the same height as the top of the fixed plate 5, the electric cylinder 10 stops working. At this time, the two rotary cylinders 13 work synchronously, driving the two rotary plates 14 to rotate synchronously inward, driving the loading motor 15 and rollers 16 to rotate inward in opposite directions. When the inner sides of the front and rear rollers 16 contact the front and rear sides of the holder 51, the rotary cylinder 13 stops working, the loading motor 15 rotates, and the rollers 16 rotate inward. The rotation of the rollers 16 causes the insert 51 between them to be moved to the left. The leftward-moving insert 51 enters the synchronous belt group 6, which then pushes the insert 51 to the left. The airflow from the jet nozzles 8 on both sides blows the PCB board on both sides during transmission. The faster airflow blows away some of the impurities adhering to the PCB board, cleaning the board surface and reducing the impact of impurities on the inspection results. By storing multiple inserts 51 on the loading plate 11, the stacked inserts 51 are automatically loaded with the help of the electric cylinder 10 and the rotary cylinder 13. The inserts 51 are precisely moved to the conveyor without manual intervention, completing the stacking task in a short time. At the same time, the loading is fast, accurate, and continuous, greatly improving work efficiency and reducing loading time and labor costs. After the PCB board is inspected by the optical inspection instrument 4, it is unloaded by the synchronous belt group 6.

[0028] In a preferred embodiment: the top front and rear sides of the insert 51 are provided with protruding ribs, and the bottom front and rear sides of the insert 51 are provided with grooves. When two or more inserts 51 are stacked, the protruding rib of the lower insert 51 will be embedded in the groove at the bottom of the upper insert 51 for neat stacking. When the insert 51 is fed to the left, it can be pushed in a straight line, and effectively avoids the displacement of multiple stacked inserts 51 by the pushing force from the front and rear sides, which would cause the insert 51 to be inaccurately positioned when feeding.

[0029] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An automated optical device for inspecting miniature PCB boards, comprising a base plate (1), a mounting frame (2), a guide seat (21), a screen (22), a transmission group (3), and an optical detector (4). The mounting frame (2) is fixedly connected to the base plate (1). The mounting frame (2) consists of guide seats (21) symmetrically arranged on the upper and lower sides and connecting plates on the front and rear sides. The optical detector (4) is slidably mounted on the guide seats (21). The transmission group (3) is mounted on the guide seats (21). The transmission group (3) consists of a transmission motor and a lead screw. The lead screw of the transmission group (3) is threadedly connected to the optical detector (4). Under the drive of the transmission motor, the lead screw will drive the optical detector (4) to move back and forth. The screen (22) is fixedly mounted on the upper front side of the mounting frame (2). Its features are: It also includes a fixed plate (5), a bracket (51), a synchronous belt group (6) and a drive motor (61). The fixed plate (5) is fixedly connected to both the front and rear sides of the upper part of the base plate (1). The two fixed plates (5) are symmetrically arranged, and a synchronous belt group (6) is installed in both fixed plates (5). The synchronous belt group (6) consists of two synchronous pulleys and a synchronous belt that are rotatably installed on the left and right sides of the fixed plate (5). The drive motor (61) is installed on the front fixed plate (5). The output shaft of the drive motor (61) is fixedly connected to the right synchronous pulley of the front synchronous belt group (6). A bracket (51) is placed between the fixed plates (5). The front and rear sides of the bracket (51) are in contact with the synchronous belt groups (6) on the front and rear sides respectively.

2. The automated optical device for inspecting miniature PCB boards according to claim 1, characterized in that: It also includes a fixed frame (9), an electric cylinder (10), a push frame (101) and a feeding plate (11). The fixed frame (9) is fixedly connected to the right side of the base plate (1). The electric cylinder (10) is fixedly installed on the right side of the fixed frame (9). The push frame (101) is fixedly connected to the movable rod of the electric cylinder (10). The feeding plate (11) is fixedly connected to the upper part of the push frame (101).

3. An automated optical device for inspecting miniature PCB boards according to claim 2, characterized in that: It also includes a rotary cylinder (13), a rotating plate (14), a feeding motor (15) and rollers (16). A rotary cylinder (13) is installed on the right side of the fixed plate (5). A rotating plate (14) is installed on the rotating clamp of the rotary cylinder (13). A feeding motor (15) is provided on the right side of the rotating plate (14). Rollers (16) are installed on the output shaft of the feeding motor (15).

4. An automated optical device for inspecting miniature PCB boards according to claim 3, characterized in that: It also includes a fixing block (7), an air pipe (71) and a jet head (8). The fixing plate (5) has fixing blocks (7) welded on both the upper and lower sides. An air pipe (71) is provided between the fixing blocks (7) on the same side. At least three jet heads (8) are connected and connected to each air pipe (71).

5. An automated optical device for inspecting miniature PCB boards according to claim 4, characterized in that: It also includes a positioning plate (12), and the front and rear sides of the feeding plate (11) are welded with positioning plates (12).

6. An automated optical device for inspecting miniature PCB boards according to claim 5, characterized in that: The top and front sides of the insert (51) are provided with ribs, and the bottom and front sides of the insert (51) are provided with grooves.

Images