Circuit board automatic detection clamping plate mechanism of AOI visual inspection machine

Abstract

The utility model discloses a circuit board automatic detection clamping plate mechanism of an AOI visual inspection machine. Comprising a control system and a detection clamping plate, the detection clamping plate comprises two product frame plates A and B which are symmetrically arranged on a detection machine platform, conveying belts are arranged on the inner sides of the two product frame plates respectively, positioning pieces are arranged on the upper sides of the conveying belts, belt conveying motors A and B are installed on the outer sides of the product frame plates A and B, a clamping electric motor is arranged in the middle of the product frame plate B, and an iron sheet is fixed to a shaft head of the tail end of the clamping electric motor. The inner sides of the product frame plates A and B are respectively provided with two vertical guide rails, four guide rail sliding blocks are arranged on the guide rails, and positioning supporting plates B and A are horizontally fixed on the guide rails, bearings are arranged on the positioning supporting plates B on the upper sides of the cams and are tightly attached to the cams, springs are fixed on the two sides of the positioning supporting plates B through spring positioning pins respectively, the upper ends of the spring positioning pins are inserted into the positioning supporting plates A, and the lower ends of the spring positioning pins are inserted into the positioning supporting plates B; photoelectric sensors D and A are fixed at the left and right ends of the product frame plate B; photoelectric sensors C and B are arranged on the left and right sides of the product frame plate B;

Description

Technical Field

[0001] This utility model relates to the field of automatic detection of circuit board soldering quality through visual recognition, and in particular to an automatic circuit board detection clamping mechanism for an AOI visual inspection machine. Background Art

[0002] AOI (Automated Optical Inspection) visual inspection machines are a type of automated equipment that has emerged in China in recent years. They perform visual recognition of electrical components on circuit boards and automatically inspect the soldering quality of the circuit boards. AOI visual inspection machines have replaced manual inspection of the soldering quality of circuit boards, greatly improving production efficiency.

[0003] The main working principle of AOI visual inspection machine is as follows: First, data sampling is performed on the electrical components of the standard circuit board. Then, a camera scans the electrical components of the circuit board to be inspected and compares them with the electrical components of the standard circuit board to determine whether the soldering quality of the electrical components of the circuit board to be inspected is qualified.

[0004] Currently, AOI (Automated Optical Inspection) machines primarily use belt conveyors to transport circuit boards, photoelectric sensors for control, and cylinders as the actuators. When the circuit board reaches the inspection position, the sensor sends a signal to the system, which then instructs the cylinder to extend its piston rod, holding the circuit board in place until the camera scans it. Since the clamping mechanism uses cylinders as actuators, it requires an air source. If the client does not share an air source, a separate air compressor must be provided, increasing inspection costs and causing inconvenience for the customer. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides an electrically driven motor to replace the cylinder, which reduces the user cost and brings convenience to the user.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an automatic circuit board inspection clamping mechanism for an AOI visual inspection machine, comprising a control system and an inspection clamping plate. The inspection clamping plate includes two symmetrically arranged elongated product racks A and B fixed on the inspection machine platform. Conveyor belts A and B are respectively installed on the upper inner sides of the two racks. Multiple positioning plates are fixedly installed on the upper sides of conveyor belts A and B. A belt conveyor motor A is installed on the outer side of product rack A, and a belt conveyor motor B is installed on the outer side of product rack B. A clamping electric motor is installed in the middle of the outer side of product rack B. The clamping electric motor has a dual-shaft head; an iron plate is fixed to the tail shaft head, and a cam is fixed to the front shaft head. A photoelectric sensor E is arranged next to the iron plate and is fixed to a photoelectric sensor bracket. The photoelectric sensor bracket is fixed to the product rack B. Two vertical guide rails are provided on the inner side of each shelf plate B. Guide rail sliders are provided on the guide rails. A positioning plate B is horizontally fixed on each of the two guide rail sliders. A positioning plate A is also fixed on the guide rail at the upper end of the positioning plate B by a slider. Between the two guide rails is a cam that clamps the front axle of the electric motor. A bearing is fixed on the positioning plate B above the cam and is in close contact with the cam. A spring positioning pin is fixed on each side of the positioning plate B. Spring A and spring B are respectively fitted on the two spring positioning pins. The upper end of the spring positioning pin is inserted into the through hole provided on the positioning plate A. Spring A and spring B support the positioning plate A. A photoelectric sensor A is fixed on the right end of the product shelf plate B and a photoelectric sensor D is fixed on the left end. Photoelectric sensors C and B are provided on the inspection machine platform and on both the left and right sides of the product shelf plate B. Photoelectric sensor C is located on the outside and photoelectric sensor B is located on the inside.

[0007] Preferably, when the photoelectric sensor E detects the iron sheet, the clamping electric motor shaft is at 0 degrees of rotation and the cam is at its minimum stroke. When the clamping electric motor shaft rotates from 0 degrees to 90 degrees, the cam rotates from its minimum stroke to its maximum stroke.

[0008] Preferably, when the PCB circuit board is conveyed from right to left, photoelectric sensor A detects the PCB circuit board approaching and sends a signal to the control system. The control system receives the signal and issues a command, starting belt conveyor motors A and B. The conveyor belts A and B drag the PCB circuit board to the left. When the PCB circuit board moves to the position of photoelectric sensor B, photoelectric sensor B sends a signal to the control system. The control system receives the signal and issues a command, causing belt conveyor motors A and B to decelerate. When the PCB circuit board moves to the position of photoelectric sensor C, photoelectric sensor C sends a signal to the control system. The control system receives the signal and issues a command, stopping belt conveyor motors A and B and starting the clamping electric motor. When the cam rotates to its maximum stroke, the cam drives the bearing to move upward to its top. At this time, the PCB circuit board is clamped by the positioning plate A and the positioning piece, and the spring is in a slightly compressed state.

[0009] Preferably, a camera is fixed on the upper side of product rack A and product rack B. After the PCB circuit board is clamped and fixed, the camera scans and takes pictures of it. After the action is completed, the control system issues a command to rotate the clamping electric motor 90 degrees in the opposite direction, that is, the cam rotates to the horizontal direction. The positioning tray A moves downward due to gravity, the PCB circuit board is released, the control system issues a command to start belt conveyor motor A and belt conveyor motor B, and the PCB circuit board is transported to the next process.

[0010] Preferably, when the PCB is transported from left to right, the photoelectric sensor D at the left end detects a signal, and the rest of the process is the same as when it is transported from right to left.

[0011] The beneficial effects of this utility model are: the electric motor replaces the cylinder drive, eliminating the need to establish a high-pressure air source, reducing the user cost, and bringing convenience to the user. Attached Figure Description

[0012] Appendix Figure 1 This is the main structural view of an AOI (Automated Optical Inspection) machine.

[0013] Appendix Figure 2 This is a top view of an AOI (Automated Optical Inspection) machine.

[0014] Appendix Figure 3 For the appendix Figure 2 BB cross-sectional view.

[0015] Appendix Figure 4 This is a schematic diagram of the structure of this utility model.

[0016] Appendix Figure 5 This is a schematic diagram of the clamping mechanism used in this application.

[0017] Appendix Figure 1—In section 5, photoelectric sensor A1, belt conveyor motor A2, spring A3, positioning tray A4, PCB circuit board 5, positioning piece 6, conveyor belt A7, photoelectric sensor D8, conveyor belt B9, photoelectric sensor bracket 10, belt conveyor motor B11, iron sheet 12, clamping electric motor 13, spring B14, cam 15, bearing 16, positioning tray B17, guide rail slider 18, product shelf A19, product shelf B20, spring positioning pin 21, camera 22, photoelectric sensor C23, photoelectric sensor B24, guide rail 25, platform 26, photoelectric sensor E27. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] Appendix Figure 1As shown in Figure 5, an automatic circuit board inspection clamping mechanism for an AOI visual inspection machine includes a control system and inspection clamps. The inspection clamps include two symmetrically arranged elongated product racks A19 and B20 fixed on the inspection machine platform 26. Conveyor belts A7 and B9 are respectively installed on the upper inner sides of both racks. Multiple positioning plates 6 are fixedly installed on the upper sides of conveyor belts A7 and B9. A belt conveyor motor A2 is installed on the outer side of product rack A19, and a belt conveyor motor B11 is installed on the outer side of product rack B20. A clamping electric motor 13 is installed in the middle of the outer side of product rack B20. The clamping electric motor 13 has two shafts; an iron plate 12 is fixed to the tail shaft, and a cam 15 is fixed to the front shaft. A photoelectric sensor E27 is arranged next to the iron plate 12 and is fixed to a photoelectric sensor bracket 10. The photoelectric sensor bracket 10 is fixed to the product rack B20. Two vertical guides are provided on the inner sides of both product racks A19 and B20. Rail 25, guide rail 25 is provided with guide rail sliders 18, and a positioning plate B17 is horizontally fixed on the two guide rail sliders 18. A positioning plate A4 is also fixed on the guide rail 25 above the positioning plate B17 by sliders. Between the two guide rails 25 is a cam 15 fixed to the front axle head of the electric motor 13. A bearing 16 is fixed on the positioning plate B17 on the upper side of the cam and is in close contact with the cam 15. A spring positioning pin 21 is fixed on each side of the positioning plate B17. Springs A3 and B14 are respectively installed. The upper end of the spring positioning pin 21 is inserted into the through hole set on the positioning tray A4. Springs A3 and B14 support the positioning tray A4. A photoelectric sensor A1 is fixed on the right end of the product rack B20, and a photoelectric sensor D8 is fixed on the left end. Photoelectric sensors C23 and B24 are set on the left and right sides of the product rack B20 on the inspection machine platform 26. Photoelectric sensor C23 is located on the outside, and photoelectric sensor B24 is located on the inside.

[0020] Preferably, when the photoelectric sensor E27 detects the iron piece 12, the clamping electric motor 13 shaft rotates to the 0-degree position, and the cam 15 is at its minimum stroke. When the clamping electric motor shaft rotates from 0 degrees to 90 degrees, the cam 15 rotates from the minimum stroke to the maximum stroke.

[0021] Preferably, when the PCB circuit board 5 is conveyed from right to left, the photoelectric sensor A1 detects the arrival of the PCB circuit board 5 and sends a signal to the control system. The control system receives the signal and issues a command, starting the belt conveyor motors A2 and B11. The conveyor belts A7 and B9 drag the PCB circuit board 5 to the left. When the PCB circuit board 5 moves to the position of the photoelectric sensor B24, the photoelectric sensor B24 sends a signal to the control system. The control system receives the signal and issues a command, causing the belt conveyor motors A2 and B11 to decelerate. When the PCB circuit board 5 moves to the position of the photoelectric sensor C23, the photoelectric sensor C23 sends a signal to the control system. The control system receives the signal and issues a command, stopping the belt conveyor motors A2 and B11. The clamping electric motor 13 starts running. When the cam 15 rotates to its maximum stroke, the cam 15 drives the bearing 16 to move upward to its top. At this time, the PCB circuit board 5 is clamped by the positioning plate A4 and the positioning piece 6, and the spring 14 is in a slightly compressed state.

[0022] Preferably, a camera 22 is fixed on the upper side of product rack A19 and product rack B20. After the PCB circuit board 5 is clamped and fixed, the camera 22 scans and takes pictures of it. After the action is completed, the control system issues a command, the clamping electric motor 13 rotates 90 degrees in the opposite direction, that is, the cam rotates to the horizontal direction, the positioning tray A4 moves downward due to gravity, the PCB circuit board 5 is released, the control system issues a command, the belt conveyor motor A2 and belt conveyor motor B11 run, and the PCB circuit board 5 is transported to the next process.

[0023] Preferably, when the PCB circuit board 5 is transported from left to right, the photoelectric sensor D8 detects a signal, and the rest of the process is the same as when it is transported from right to left.

[0024] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic circuit board inspection clamping mechanism for an AOI visual inspection machine, characterized in that: It includes a control system and a testing clamp. The testing clamp comprises two symmetrically arranged elongated product racks A and B, fixed to the testing machine platform. Conveyor belts A and B are respectively installed on the upper inner sides of both racks. Multiple positioning plates are fixed on the upper sides of conveyor belts A and B. A belt conveyor motor A is installed on the outer side of product rack A, and a belt conveyor motor B is installed on the outer side of product rack B. A clamping electric motor is installed in the middle of the outer side of product rack B. The clamping electric motor has a dual-shaft head; an iron plate is fixed to the tail shaft head, and a cam is fixed to the front shaft head. A photoelectric sensor E is located next to the iron plate and is fixed to a photoelectric sensor bracket, which is fixed to product rack B. Two vertical guide rails are provided on the inner sides of both product racks A and B. The device has guide rail sliders, with a positioning plate B horizontally fixed on each of the two guide rail sliders. A positioning plate A is also fixed to the guide rail at the upper end of positioning plate B using sliders. Between the two guide rails is a cam that clamps the front axle of the electric motor. A bearing is fixed to the positioning plate B on the upper side of the cam, fitting snugly against the cam. A spring positioning pin is fixed to each side of positioning plate B, with springs A and B respectively fitted onto each spring positioning pin. The upper ends of the spring positioning pins are inserted into through holes in positioning plate A, supporting positioning plate A. A photoelectric sensor A is fixed to the right end of product shelf B, and a photoelectric sensor D is fixed to the left end. Photoelectric sensors C and B are installed on the testing machine platform and on both sides of product shelf B, with photoelectric sensor C located on the outer side and photoelectric sensor B located on the inner side.

2. The automatic circuit board inspection clamping mechanism of an AOI visual inspection machine according to claim 1, characterized in that: When the photoelectric sensor E detects the iron piece, the clamping electric motor shaft rotates to the 0-degree position, and the cam is at its minimum stroke. When the clamping electric motor shaft rotates from 0 degrees to 90 degrees, the cam rotates from the minimum stroke to the maximum stroke.

3. The automatic circuit board inspection clamping mechanism of an AOI visual inspection machine according to claim 1, characterized in that: When the PCB is conveyed from right to left, photoelectric sensor A detects the PCB and sends a signal to the control system. The control system receives the signal and issues a command, starting belt conveyor motors A and B. Belts A and B drag the PCB to the left. When the PCB reaches the position of photoelectric sensor B, photoelectric sensor B sends a signal to the control system. The control system receives the signal and issues a command, causing belt conveyor motors A and B to decelerate. When the PCB reaches the position of photoelectric sensor C, photoelectric sensor C sends a signal to the control system. The control system receives the signal and issues a command, stopping belt conveyor motors A and B. The clamping electric motor starts running. When the cam rotates to its maximum stroke, the cam drives the bearing to move upward to its highest point. At this time, the PCB is clamped by the positioning plate A and the positioning piece, and the spring is in a slightly compressed state.

4. The automatic circuit board inspection clamping mechanism of an AOI visual inspection machine according to claim 1, characterized in that: Cameras are fixed on the upper side of product rack A and product rack B. After the PCB circuit board is clamped and fixed, the camera scans and takes pictures of it. After the action is completed, the control system issues a command to rotate the clamping electric motor 90 degrees in the opposite direction, that is, the cam rotates to the horizontal direction. The positioning tray A moves downward due to gravity, the PCB circuit board is released, and the control system issues a command to start belt conveyor motors A and B, and the PCB circuit board is transported to the next process.

5. The automatic circuit board inspection clamping mechanism of an AOI visual inspection machine according to claim 1, characterized in that: When the PCB is transported from left to right, the photoelectric sensor D at the left end detects a signal, and the rest of the process is the same as when it is transported from right to left.

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