A PCB SMT patch detection device

Abstract

This invention discloses a PCB board SMT placement inspection device. The SMT placement inspection device includes a deflection correction device, an angle adjustment device, and a detection and judgment device. The deflection correction device adjusts the position of the PCB board on a horizontal conveyor belt, the angle adjustment device adjusts the placement angle of the PCB board to facilitate detection and judgment, and the detection and judgment device determines whether there are any abnormal components based on the acquired image of the PCB board. This invention has the following technical advantages: it improves the efficiency of position correction and increases the detection accuracy when multiple different components are present on the PCB board.

Description

Technical Field

[0001] This invention belongs to the field of PCB manufacturing, and specifically relates to a device for SMT assembly and inspection of PCB boards. Background Technology

[0002] SMT (short for Surface Mount Technology) is a technology that utilizes surface mount technology. With the development of electronic technology, especially small electronic products, the application of circuit boards, particularly space-saving FPC boards (flexible printed circuit boards), is becoming increasingly widespread.

[0003] However, current detection devices suffer from inaccurate detection. While improvements have been made to various light sources, cameras, and algorithms to enhance accuracy, no method has been found to improve accuracy by presenting the PCB board at different angles or in different states, which is the most effective approach. Summary of the Invention

[0004] In view of the above-mentioned technical problems, the present invention provides a device for SMT placement inspection of PCB boards, which aims to solve the problems in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0006] A PCB board SMT placement inspection device is provided. The SMT placement inspection device includes a deflection correction device 1, an angle adjustment device 2, and a detection and judgment device. The deflection correction device 1 is used to adjust the position of the PCB board 7 on the horizontal conveyor belt 4. The angle adjustment device 2 is used to adjust the placement angle of the PCB board 7 to facilitate detection and judgment. The detection and judgment device determines whether there are any abnormalities in the components based on the acquired image of the PCB board 7.

[0007] Furthermore, the abnormalities include solder bridging, insufficient solder, open solder joints, missing components, reversed components, and vertical component abnormalities.

[0008] Furthermore, the deflection correction device 1 is installed on the support beam 3. The deflection correction device 1 is connected to the support beam 3 via an electric telescopic rod. Two deflection correction devices 1 are provided. A horizontal conveyor belt 4 is provided below the deflection correction device 1. The horizontal conveyor belt 4 is used to transport the PCB board 7. The angle adjustment device 2 is located behind the horizontal conveyor belt 4. A slide rail 5 is provided on the support beam 3 above the angle adjustment device 2. The detection and judgment device has an image acquisition device 6, which is located on the slide rail 5 and can move along the slide rail 5.

[0009] Furthermore, the deflection correction device 1 has a housing 8, a transmission box 13 fixed at the front end of the housing 8, a support wheel 10 at the rear end of the housing 8, a first gear 11 on the shafts on both sides of the support wheel 10, and a second gear 12 on both sides of the transmission box 13. The first gear 11 and the second gear 12 are connected by a chain 9. The two second gears 12 are connected by a support shaft 14. The support shaft 14 passes through the transmission box 13. A first bevel gear 15 is fixed on the support shaft 14 inside the transmission box 13. The first bevel gear 15 meshes with a second bevel gear 16. The connecting shaft 18 of the second bevel gear 16 passes through the transmission box 13 and is connected to the turntable 19 below. The connecting shaft 18 is supported on the transmission box 13 by a bearing 17. A buffer pad 20, which is a rubber pad, is provided on the circumferential surface of the turntable 19.

[0010] Furthermore, a cavity 21 is provided on the lower side of the turntable 19. The cavity 21 is a circular cavity. A fixing post 22 is provided at the center of the cavity 21. Three rollers 23 are evenly arranged in the cavity 21.

[0011] Furthermore, one end of the rotating shaft of the roller 23 is rotatably connected to the side wall of the cavity 21, and the other end is rotatably connected to the fixed column 22.

[0012] Furthermore, the structures inside the transmission boxes 13 of the two deflection correction devices 1 are different. In one transmission box 13, the first bevel gear 15 and the second bevel gear 16 mesh on one side of the second bevel gear 16, while in the other transmission box 13, the first bevel gear 15 and the second bevel gear 16 mesh on the other side of the second bevel gear 16. The rotation directions of the two turntables 19 are opposite, so that both turntables 19 deflect the PCB board toward the inside of the horizontal conveyor belt 4.

[0013] Furthermore, the angle adjustment device 2 has a frame 24, with a first fixed wheel 25 at one end of the frame 24 and a tensioning wheel 26 at the other end of the frame 24. The tensioning wheel 26 is adjusted by a tensioning cylinder 27. A plurality of second fixed wheels 28 are arranged between the first fixed wheel 25 and the tensioning wheel 26. A first movable roller 30 is arranged between the first fixed wheel 25 and the second fixed wheels 28. The first movable roller 30 is driven by a first tilting cylinder 29. A second movable roller 32 is arranged between the tensioning wheel 26 and the second fixed wheels 28. The second movable roller 32 is driven by a second tilting cylinder 31. A transmission belt 33 is wound around the outside of the first fixed wheel 25, the tensioning wheel 26, the first movable roller 30, and the second movable roller 32. The second fixed wheel 28 is arranged on the outside of the transmission belt 33.

[0014] Furthermore, multiple second fixed wheels 28 are horizontally arranged.

[0015] Furthermore, the horizontal conveyor belt 4 is driven by a motor, and the first fixed wheel 25 is connected to another drive motor. When the PCB board 7 moves on the transmission belt 33, the image acquisition device 6 moves synchronously with the PCB board 7.

[0016] The present invention has the following technical effects:

[0017] 1. A deflection correction device is installed before testing. The deflection correction device is adjusted by an electric telescopic rod, so that the support wheel presses against the horizontal conveyor belt. The horizontal conveyor belt drives the support wheel to rotate, thereby driving the turntable to rotate. The position of the PCB board is adjusted under the action of the double-sided buffer pads. At the same time, rollers are also installed. The rollers enable the turntable to move the PCB board under the action of the conveyor belt, which improves the efficiency of position correction.

[0018] 2. The angle adjustment device can change the angle of the PCB board during transmission. At the same time, the detection and judgment device moves with the PCB board and acquires all its states on the conveyor belt. Different angles can be used to detect different components, which improves the detection accuracy when there are multiple different components on the PCB board. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of the present invention.

[0020] Figure 2 A schematic diagram of the PCB board of the present invention passing through the deflection correction device.

[0021] Figure 3 A schematic diagram of the internal structure of the deflection correction device of the present invention.

[0022] Figure 4 Top view of the internal structure of the deflection correction device of the present invention.

[0023] Figure 5 A partial internal schematic diagram of the present invention.

[0024] The diagram shows the following components: 1. Deflection correction device; 2. Angle adjustment device; 3. Support beam; 4. Horizontal conveyor belt; 5. Slide rail; 6. Image acquisition device; 7. PCB board; 8. Housing; 9. Chain; 10. Support wheel; 11. First gear; 12. Second gear; 13. Transmission box; 14. Support shaft; 15. First bevel gear; 16. Second bevel gear; 17. Bearing; 18. Connecting shaft; 19. Turntable; 20. Buffer pad; 21. Cavity; 22. Fixed column; 23. Roller; 24. Frame; 25. First fixed wheel; 26. Tensioning wheel; 27. Tensioning cylinder; 28. Second fixed wheel; 29. ​​First tilting cylinder; 30. First moving roller; 31. Second tilting cylinder; 32. Second moving roller; 33. Conveyor belt. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] In the description of this invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0028] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] like Figure 1 As shown, the present invention discloses a PCB board SMT placement inspection device. The SMT placement inspection device has a deflection correction device 1, an angle adjustment device 2 and a detection and judgment device. The deflection correction device 1 is used to adjust the position of the PCB board 7 on the horizontal conveyor belt 4. The angle adjustment device 2 is used to adjust the placement angle of the PCB board 7 to facilitate detection and judgment. The detection and judgment device determines whether there are any abnormalities in the components based on the image of the PCB board 7 obtained.

[0030] The abnormalities include solder bridging, insufficient solder, open solder joints, missing components, reversed components, and vertical components.

[0031] The deflection correction device 1 is mounted on the support beam 3. The deflection correction device 1 is connected to the support beam 3 via an electric telescopic rod. There are two deflection correction devices 1. A horizontal conveyor belt 4 is provided below the deflection correction device 1. The horizontal conveyor belt 4 is used to transport the PCB board 7. An angle adjustment device 2 is located behind the horizontal conveyor belt 4. A slide rail 5 is provided on the support beam 3 above the angle adjustment device 2. The detection and judgment device has an image acquisition device 6, which is located on the slide rail 5 and can move along the slide rail 5.

[0032] like Figure 3 , 4 As shown, the deflection correction device 1 has a housing 8, a transmission box 13 fixed at the front end of the housing 8, a support wheel 10 at the rear end of the housing 8, a first gear 11 on the shafts on both sides of the support wheel 10, and a second gear 12 on both sides of the transmission box 13. The first gear 11 and the second gear 12 are connected by a chain 9. The two second gears 12 are connected by a support shaft 14. The support shaft 14 passes through the transmission box 13. A first bevel gear 15 is fixed on the support shaft 14 inside the transmission box 13. The first bevel gear 15 meshes with a second bevel gear 16. The connecting shaft 18 of the second bevel gear 16 passes through the transmission box 13 and is connected to a turntable 19 below. The connecting shaft 18 is supported on the transmission box 13 by a bearing 17. A buffer pad 20, which is a rubber pad, is provided on the circumferential surface of the turntable 19.

[0033] A cavity 21 is provided on the lower side of the turntable 19. The cavity 21 is a circular cavity. A fixed column 22 is provided at the center of the cavity 21. Three rollers 23 are evenly arranged in the cavity 21.

[0034] One end of the rotating shaft of the roller 23 is rotatably connected to the side wall of the cavity 21, and the other end is rotatably connected to the fixed column 22.

[0035] To ensure the two turntables rotate in different directions, the structures within the transmission boxes 13 of the two deflection correction devices 1 are different. In one transmission box 13, the first bevel gear 15 meshes with the second bevel gear 16 on one side of the second bevel gear 16, while in the other transmission box 13, the first bevel gear 15 meshes with the second bevel gear 16 on the other side of the second bevel gear 16. The two turntables 19 rotate in opposite directions, causing both turntables 19 to deflect the PCB board towards the inward side of the horizontal conveyor belt 4. Figure 2 As shown.

[0036] like Figure 5As shown, the angle adjustment device 2 has a frame 24. A first fixed wheel 25 is provided at one end of the frame 24, and a tensioning wheel 26 is provided at the other end of the frame 24. The tensioning wheel 26 is adjusted by a tensioning cylinder 27. A plurality of second fixed wheels 28 are provided between the first fixed wheel 25 and the tensioning wheel 26. A first movable roller 30 is provided between the first fixed wheel 25 and the second fixed wheels 28. The first movable roller 30 is driven by a first tilting cylinder 29. A second movable roller 32 is provided between the tensioning wheel 26 and the second fixed wheels 28. The second movable roller 32 is driven by a second tilting cylinder 31. A transmission belt 33 is wound around the outside of the first fixed wheel 25, the tensioning wheel 26, the first movable roller 30, and the second movable roller 32. The second fixed wheel 28 is located on the outside of the transmission belt 33.

[0037] Multiple second fixed wheels 28 are horizontally arranged.

[0038] The horizontal conveyor belt 4 is driven by a motor, and the first fixed wheel 25 is connected to another drive motor. When the PCB board 7 moves on the transmission belt 33, the image acquisition device 6 moves synchronously with the PCB board 7.

[0039] It should be noted that the present invention has a controller for controlling the operation of the SMT placement and inspection device, which is a conventional control device.

[0040] The present invention has the following technical effects:

[0041] 1. A deflection correction device is installed before testing. The deflection correction device is adjusted by an electric telescopic rod, so that the support wheel presses against the horizontal conveyor belt. The horizontal conveyor belt drives the support wheel to rotate, thereby driving the turntable to rotate. The position of the PCB board is adjusted under the action of the double-sided buffer pads. At the same time, rollers are also installed. The rollers enable the turntable to move the PCB board under the action of the conveyor belt, which improves the efficiency of position correction.

[0042] 2. The angle adjustment device can change the angle of the PCB board during transmission. At the same time, the detection and judgment device moves with the PCB board and acquires all its states on the conveyor belt. Different angles can be used to detect different components, which improves the detection accuracy when there are multiple different components on the PCB board.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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. A device for SMT assembly inspection of PCB boards, characterized in that: The SMT placement inspection device has a deflection correction device (1), an angle adjustment device (2) and an inspection and judgment device. The deflection correction device (1) is used to adjust the position of the PCB board (7) on the horizontal conveyor belt (4). The angle adjustment device (2) is used to adjust the placement angle of the PCB board (7) to facilitate inspection and judgment. The inspection and judgment device determines whether there are any abnormalities in the components based on the obtained image of the PCB board (7). The deflection correction device (1) is installed on the support beam (3). The deflection correction device (1) is connected to the support beam (3) via an electric telescopic rod. There are two deflection correction devices (1). A horizontal conveyor belt (4) is provided below the deflection correction device (1). The horizontal conveyor belt (4) is used to transport the PCB board (7). An angle adjustment device (2) is located behind the horizontal conveyor belt (4). A slide rail (5) is provided on the support beam (3) above the angle adjustment device (2). The detection and judgment device has an image acquisition device (6). The image acquisition device (6) is located on the slide rail (5) and can move along the slide rail (5). The deflection correction device (1) has a housing (8), a transmission box (13) is fixed at the front end of the housing (8), and a support wheel (10) is provided at the rear end of the housing (8). A first gear (11) is provided on the shafts on both sides of the support wheel (10), and a second gear (12) is provided on both sides of the transmission box (13). The first gear (11) and the second gear (12) are connected by a chain (9), and the two second gears (12) are connected by a support shaft (14). The support shaft (14) passes through... On the transmission box (13), a first bevel gear (15) is fixed on the support shaft (14) inside the transmission box (13). The first bevel gear (15) meshes with a second bevel gear (16). The connecting shaft (18) of the second bevel gear (16) passes through the transmission box (13) and is connected to the turntable (19) below. The connecting shaft (18) is supported on the transmission box (13) by a bearing (17). A buffer pad (20) is provided on the circumferential surface of the turntable (19). The buffer pad (20) is a rubber pad.

2. The PCB SMT assembly inspection device as described in claim 1, characterized in that: A cavity (21) is provided on the lower side of the turntable (19). The cavity (21) is a circular cavity. A fixed column (22) is provided at the center of the cavity (21). Three rollers (23) are evenly arranged in the cavity (21).

3. The PCB SMT assembly inspection device as described in claim 2, characterized in that: One end of the rotating shaft of the roller (23) is rotatably connected to the side wall of the cavity (21), and the other end is rotatably connected to the fixed column (22).

4. The PCB SMT assembly inspection device as described in claim 3, characterized in that: The two deflection correction devices (1) have different structures in the transmission box (13). In one transmission box (13), the first bevel gear (15) and the second bevel gear (16) mesh on one side of the second bevel gear (16), while in the other transmission box (13), the first bevel gear (15) and the second bevel gear (16) mesh on the other side of the second bevel gear (16). The two turntables (19) rotate in opposite directions, causing both turntables (19) to deflect the PCB board toward the inside of the horizontal conveyor belt (4).

5. The PCB SMT assembly inspection device as described in claim 4, characterized in that: The angle adjustment device (2) has a frame (24), a first fixed wheel (25) is provided at one end of the frame (24), and a tension wheel (26) is provided at the other end of the frame (24). The tension wheel (26) is adjusted by a tension cylinder (27). A plurality of second fixed wheels (28) are provided between the first fixed wheel (25) and the tension wheel (26). A first movable roller (30) is provided between the first fixed wheel (25) and the second fixed wheel (28). The first movable roller (30) is driven by a first tilting cylinder (29). A second movable roller (32) is provided between the tension wheel (26) and the second fixed wheel (28). The second movable roller (32) is driven by a second tilting cylinder (31). A transmission belt (33) is wound around the outside of the first fixed wheel (25), the tension wheel (26), the first movable roller (30), and the second movable roller (32). The second fixed wheel (28) is located on the outside of the transmission belt (33).

6. The PCB SMT assembly inspection device as described in claim 5, characterized in that: Multiple second fixed wheels (28) are horizontally arranged.

7. The PCB SMT assembly inspection device as described in claim 6, characterized in that: The horizontal conveyor belt (4) is driven by a motor, and the first fixed wheel (25) is connected to another drive motor. When the PCB board (7) moves on the transmission belt (33), the image acquisition device (6) moves synchronously with the PCB board (7).

Images