3D-AOI detection equipment

Abstract

The utility model provides 3D-AOI detection equipment which comprises a plate feeding assembly, a detection assembly is arranged on the top of the plate feeding assembly, and the detection assembly comprises a light shield, a controller, a servo motor, a support, a laser range finder, a supporting plate, a threaded rod, a lifting seat, a CCD camera and a light supplementing lamp. A controller is installed on the top of the light shield, servo motors are symmetrically installed on the top of the light shield, and a support is fixedly connected to the inner side wall of the light shield. The distance between the surface of the PCB and the laser range finder is detected through the laser range finder, the distance data is sent to the controller, and the controller performs height compensation on the CCD camera according to the distance change, so that the equipment detection precision is improved, the false alarm rate is reduced, and the yield and the detection rate are improved. According to the invention, through performing height compensation on the bending of the PCB, the problem that the detection precision is influenced by the bending of the PCB body after reflow soldering can be effectively solved, and the false alarm caused by the bending of the large-size PCB and the flexible circuit board can be reduced at the same time.

Description

Technical Field

[0001] The utility model relates to a detection device, in particular to a 3D-AOI detection device, belonging to the technical field of AOI detection equipment. Background Art

[0002] AOI (Automated Optical Inspection) is an essential technology in electronic component production. It utilizes high-speed cameras and advanced image processing technology to perform high-precision and efficient defect detection on production objects such as PCBs. Through real-time scanning, image acquisition, and comparative analysis, AOI equipment can quickly identify defects such as multiple parts, missing parts, and poor soldering, and automatically mark them, providing strong support for production adjustments and quality control.

[0003] In the current SMT industry, with the widespread use of flexible printed circuits (FPCs) and large PCBs, these specialized boards present numerous challenges during inspection. The tendency of FPCs to warp, and the potential for large boards to collapse under their own weight, directly impact the focal stability of inspection equipment cameras, resulting in blurred images and, in turn, reduced inspection accuracy. Furthermore, PCB warpage complicates the selection of reference planes, leading to offset test positions and inaccurate or even invalid inspection results. To address this issue, a 3D-AOI inspection device was proposed. Utility Model Content

[0004] In view of this, the present invention provides a 3D-AOI inspection device to solve or alleviate one of the technical problems existing in the prior art and at least provide a beneficial option.

[0005] The technical solution of the embodiment of the utility model is implemented as follows: a 3D-AOI inspection device includes a plate feeding assembly, a detection assembly is arranged on the top of the plate feeding assembly, and the detection assembly includes a light shield, a controller, a servo motor, a bracket, a laser rangefinder, a support plate, a threaded rod, a lifting seat, a CCD camera and a fill light;

[0006] A controller is installed on the top of the light shield, a servo motor is symmetrically installed on the top of the light shield, a bracket is fixedly connected to the inner side wall of the light shield, a laser rangefinder is installed on the inner side wall of the bracket, two support plates are symmetrically fixedly connected to the inner side wall of the light shield, a threaded rod is rotatably connected to the inner side wall of the support plate, one end of the threaded rod is fixedly connected to the output shaft of the servo motor, a lifting seat is threadedly connected to the outer side wall of the threaded rod, a CCD camera is installed at the bottom of the lifting seat, and a fill light is installed at the bottom of the lifting seat.

[0007] Further preferably, the signal input end of the controller is signal-connected to the signal output end of the laser rangefinder, and the electrical output end of the controller is electrically connected to the electrical input end of the servo motor.

[0008] Further preferably, the plate feeding assembly includes a base plate, and the light shield is fixedly connected to the upper surface of the base plate.

[0009] Further preferably, the bottom of the base plate is symmetrically and fixedly connected with support legs.

[0010] Further preferably, the plate delivery assembly further includes a conveying guide rail, and two conveying guide rails are symmetrically fixedly connected to the top of the base plate.

[0011] Further preferably, conveying wheels are evenly installed on one side of the conveying guide rail.

[0012] Further preferably, a drive motor is installed on one side of the conveying guide rail.

[0013] Further preferably, a PCB board is provided on the top of the conveying wheel.

[0014] The embodiment of the present invention has the following advantages due to the adoption of the above technical solution:

[0015] 1. The utility model uses a laser rangefinder to detect the distance between the PCB surface and it, and sends the distance data to the controller. The controller performs height compensation on the CCD camera according to the distance change, thereby improving the detection accuracy of the equipment, reducing the false alarm rate, and improving the yield rate and detection rate.

[0016] Second, the present invention can effectively solve the problem of PCB bending after reflow soldering, which affects the detection accuracy, by highly compensating for the bending of the PCB board. At the same time, it can reduce false alarms caused by the bending of large-sized PCBs and flexible circuit boards.

[0017] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1It is a structural diagram of the utility model;

[0020] Figure 2 This is a diagram showing the internal structure of the light shield of the present invention;

[0021] Figure 3 This is a structural diagram of the lifting seat of the utility model;

[0022] Figure 4 This is a structural diagram of the support plate of the present utility model.

[0023] Figure numerals: 10, board delivery assembly; 11, bottom plate; 12, support leg; 13, conveying guide rail; 14, conveying wheel; 15, drive motor; 16, PCB board; 20, detection assembly; 21, light shield; 22, controller; 23, servo motor; 24, bracket; 25, laser rangefinder; 26, support plate; 27, threaded rod; 28, lifting seat; 29, CCD camera; 210, fill light. DETAILED DESCRIPTION

[0024] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-Figure 4 As shown, the embodiment of the present invention provides a 3D-AOI inspection device, including a plate feeding assembly 10, a detection assembly 20 is provided on the top of the plate feeding assembly 10, and the detection assembly 20 includes a light shield 21, a controller 22, a servo motor 23, a bracket 24, a laser rangefinder 25, a support plate 26, a threaded rod 27, a lifting seat 28, a CCD camera 29 and a fill light 210;

[0027] A controller 22 is installed on the top of the light shield 21, a servo motor 23 is symmetrically installed on the top of the light shield 21, a bracket 24 is fixedly connected to the inner wall of the light shield 21, a laser rangefinder 25 is installed on the inner wall of the bracket 24, two support plates 26 are symmetrically fixedly connected to the inner wall of the light shield 21, a threaded rod 27 is rotatably connected to the inner wall of the support plate 26, one end of the threaded rod 27 is fixedly connected to the output shaft of the servo motor 23, and a lifting seat 28 is threadedly connected to the outer wall of the threaded rod 27, a CCD camera 29 is installed at the bottom of the lifting seat 28, and a fill light 210 is installed at the bottom of the lifting seat 28. The laser rangefinder 25 detects P The distance between the surface of the PCB board 16 and the CCD camera 29 is measured, and the distance data is sent to the controller 22. The controller 22 performs height compensation on the CCD camera 29 according to the distance change. During the height compensation process, the servo motor 23 drives the threaded rod 27 to rotate and adjust the height of the lifting seat 28 to ensure that a fixed distance is maintained between the surface of the PCB board 16 and the CCD camera 29, thereby improving the equipment detection accuracy, reducing the false alarm rate, and increasing the yield rate and detection rate. The CCD camera 29 is connected to the AOI control terminal and sends the image data to the AOI detection system. The fill light 210 can increase the light brightness during the detection process to improve image clarity.

[0028] In this embodiment, specifically: the signal input end of the controller 22 is signal-connected to the signal output end of the laser rangefinder 25 , and the electrical output end of the controller 22 is electrically connected to the electrical input end of the servo motor 23 .

[0029] In this embodiment, specifically: the plate feeding assembly 10 includes a bottom plate 11 , and the light shield 21 is fixedly connected to the upper surface of the bottom plate 11 . The light shield 21 is used to reduce the influence of stray light on the detection result.

[0030] In this embodiment, specifically: the bottom of the base plate 11 is symmetrically fixedly connected with support legs 12, and the support legs 12 play a role of stable support.

[0031] In this embodiment, specifically, the board feeding assembly 10 further includes a conveying guide rail 13 , and two conveying guide rails 13 are symmetrically fixedly connected to the top of the bottom plate 11 , and the PCB board 16 moves along the conveying guide rails 13 .

[0032] In this embodiment, specifically: conveying wheels 14 are evenly installed on one side of the conveying guide rail 13, and a chain and sprocket transmission mechanism is used to transmit power between the plurality of conveying wheels 14, thereby ensuring synchronous movement.

[0033] In this embodiment, specifically: a driving motor 15 is installed on one side of the conveying guide rail 13, and the driving motor 15 is used to drive the conveying wheel 14 to rotate.

[0034] In this embodiment, specifically: a PCB board 16 is provided on the top of the conveying wheel 14, and the PCB board 16 can be replaced by a flexible circuit board. The utility model can complete the detection of large-size circuit boards and flexible circuit boards.

[0035] When the present invention is in operation: the PCB board 16 moves along the conveying guide rail 13, and after reaching the detection position, the distance between the surface of the PCB board 16 and it is detected by the laser rangefinder 25, and the distance data is sent to the controller 22. The controller 22 performs height compensation on the CCD camera 29 according to the distance change. During the height compensation process, the servo motor 23 drives the threaded rod 27 to rotate, and adjusts the height of the lifting seat 28 to ensure that a fixed distance is maintained between the surface of the PCB board 16 and the CCD camera 29, thereby improving the detection accuracy of the equipment, reducing the false alarm rate, and improving the yield rate and detection rate. By performing height compensation for the bending of the PCB board 16, the problem of the bending of the PCB board 16 after reflow soldering, which affects the detection accuracy, can be effectively solved. At the same time, false alarms caused by the bending of large-size PCBs and flexible circuit boards can be reduced.

[0036] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A 3D-AOI inspection device, comprising a board feeding assembly (10), characterized in that: A detection assembly (20) is provided on the top of the plate delivery assembly (10), and the detection assembly (20) includes a light shield (21), a controller (22), a servo motor (23), a bracket (24), a laser rangefinder (25), a support plate (26), a threaded rod (27), a lifting seat (28), a CCD camera (29) and a fill light (210); A controller (22) is installed on the top of the light shield (21), a servo motor (23) is symmetrically installed on the top of the light shield (21), a bracket (24) is fixedly connected to the inner side wall of the light shield (21), a laser rangefinder (25) is installed on the inner side wall of the bracket (24), two support plates (26) are symmetrically fixedly connected to the inner side wall of the light shield (21), a threaded rod (27) is rotatably connected to the inner side wall of the support plate (26), one end of the threaded rod (27) is fixedly connected to the output shaft of the servo motor (23), the outer side wall of the threaded rod (27) is threadedly connected to a lifting seat (28), a CCD camera (29) is installed at the bottom of the lifting seat (28), and a fill light (210) is installed at the bottom of the lifting seat (28).

2. The 3D-AOI inspection equipment according to claim 1, characterized in that: The signal input end of the controller (22) is signal-connected to the signal output end of the laser rangefinder (25), and the electrical output end of the controller (22) is electrically connected to the electrical input end of the servo motor (23).

3. The 3D-AOI inspection equipment according to claim 1, characterized in that: The plate delivery assembly (10) comprises a base plate (11), and the light shield (21) is fixedly connected to the upper surface of the base plate (11).

4. The 3D-AOI inspection equipment according to claim 3, characterized in that: The bottom of the base plate (11) is symmetrically and fixedly connected with support legs (12).

5. The 3D-AOI inspection equipment according to claim 4, characterized in that: The plate delivery assembly (10) further comprises a conveying guide rail (13), and two conveying guide rails (13) are symmetrically fixedly connected to the top of the base plate (11).

6. The 3D-AOI inspection equipment according to claim 5, characterized in that: Conveying wheels (14) are evenly installed on one side of the conveying guide rail (13).

7. The 3D-AOI inspection equipment according to claim 6, characterized in that: A driving motor (15) is installed on one side of the conveying guide rail (13).

8. The 3D-AOI inspection equipment according to claim 6, characterized in that: A PCB board (16) is provided on the top of the conveying wheel (14).

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