Detection device for PCB (Printed Circuit Board)

Abstract

The utility model provides a PCB board detection device comprising a detection mechanism, the detection mechanism comprises a detection rack, an adjusting device and a linear array scanning camera, the linear array scanning camera is arranged on the detection rack through the adjusting device, the adjusting device comprises a first adjusting assembly and a second adjusting assembly, and the first adjusting assembly and the second adjusting assembly are arranged on the detection rack. The first adjusting assembly is arranged on the detection rack, the second adjusting assembly is arranged on the first adjusting assembly, the linear array scanning camera is arranged on the second adjusting assembly, and the first adjusting assembly is used for adjusting the perpendicularity of the second adjusting assembly; the second adjusting assembly is used for adjusting the parallelism of scanning lines of the linear array scanning camera; according to the structure of the utility model, the position of the detection part can be adjusted, so that the position of the detection device is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of PCB board detection, and particularly relates to a detection device for a PCB board. Background Art

[0002] In order to detect defects on a PCB board in advance and reduce losses, the defect detection link is crucial. Common defect detection methods include: manual visual inspection, electronic detection, and automatic optical inspection. Manual visual inspection is that the inspector uses a magnifying glass or a projector to detect whether there are defects by the naked eye; common electronic detection devices mainly include bed-of-nails testing and flying probe testing; automatic optical inspection is to use a high-resolution camera and a special light source to obtain the image of the PCB board, and automatically detect the defects on the PCB board through grayscale conversion, binary processing, feature extraction, feature detection, and template matching, which has the advantages of stability, reliability, high precision, and high efficiency.

[0003] For example, the patent document with the Chinese patent application number CN202311034178.3 and the publication date of November 10, 2023 discloses a method for visual defect detection of a PCB board, including the steps of: shaping a laser light source into a column of discrete laser dots and projecting them onto the surface of the object to be measured; a line-scan camera collecting the image of the surface of the object to be measured; synchronously moving the laser light source and the line-scan camera or moving the object to be detected; a processing device performing data synthesis and data processing on the collected image of the surface of the object to be measured; by analyzing the deformation conditions of multiple curves formed by multiple laser dots, the three-dimensional surface shape of the surface of the object to be measured can be obtained, so as to analyze and judge the 3D defects on the surface.

[0004] This document can detect the surface of the PCB board. However, for a PCB board, a large number of blind holes need to be set for subsequent processing. For the blind holes, due to their small size and certain depth, the position of the detection device is particularly important. If the position of the detection device is slightly offset, it is easy to cause the deep part of the blind hole to not be detected, which affects the detection accuracy. Summary of the Invention

[0005] The purpose of the utility model is to provide a detection device for a PCB board, which can adjust the position of the detection component to make the position of the detection device more accurate.

[0006] To achieve the above object, the utility model provides a detection device for a PCB board, including a detection mechanism. The detection mechanism includes a detection frame, an adjustment device and a line array scanning camera. The line array scanning camera is arranged on the detection frame through the adjustment device. The adjustment device includes a first adjustment component and a second adjustment component. The first adjustment component is arranged on the detection frame, and the second adjustment component is arranged on the first adjustment component. The line array scanning camera is arranged on the second adjustment component. The first adjustment component is used to adjust the perpendicularity of the second adjustment component; the second adjustment component is used to adjust the parallelism of the scanning line of the line array scanning camera.

[0007] In the above structure, by setting the first adjustment component and the second adjustment component, the detection mechanism can be adjusted, so that the line array scanning camera can be perpendicular to the horizontal plane, and the scanning line of the line array scanning camera can be parallel to the standard line set on the horizontal plane. In this way, when scanning and detecting blind holes, the position of each scanned blind hole can be determined, so that when comparing the blind holes of the current PCB board with the standard blind holes subsequently, a high measurement accuracy can be maintained. At the same time, by adjusting the perpendicularity of the line array scanning camera, it is ensured that the line array scanning camera can scan to the bottom of the blind hole, avoiding the problem that the depth measurement of the blind hole is inaccurate because the line array scanning camera can only scan the inner wall of the blind hole due to angle deviation.

[0008] Further, the first adjustment component includes a first adjustment mounting plate, a first adjustment mounting shaft, a first adjustment block, a first adjustment plate, a first adjustment screw and a second adjustment screw. The first adjustment mounting shaft is arranged on the detection frame. The center of the first adjustment mounting plate is provided with a mounting hole corresponding to the first adjustment mounting shaft. The first adjustment mounting plate is arranged on the first adjustment mounting shaft. A first adjustment plate is arranged on the detection frame on one side of the first adjustment mounting plate. A first adjustment groove is arranged on the first adjustment plate. A first adjustment block is arranged on one side of the first adjustment mounting plate. The first adjustment block is located in the first adjustment groove. A first adjustment screw and a second adjustment screw are respectively arranged on the first adjustment plate on both sides of the first adjustment block. A threaded hole is arranged on the first adjustment plate. The first adjustment screw and the second adjustment screw are located in the threaded hole. The first adjustment screw and the second adjustment screw approach each other and abut against both sides of the first adjustment block.

[0009] With the above settings, through the setting of the first adjustment screw and the second adjustment screw, when fine-tuning the first adjustment mounting plate is required, the first adjustment screw and the second adjustment screw are rotated, so that the first adjustment mounting plate can rotate, thereby realizing the adjustment of the vertical angle of the first adjustment mounting plate.

[0010] Further, the second adjustment assembly includes a second adjustment mounting plate, a second adjustment connecting plate, a second adjustment block, a second adjustment plate, a third adjustment screw, and a fourth adjustment screw. The second adjustment connecting plate is disposed on the first adjustment mounting plate. A through hole is provided at the center of the second adjustment connecting plate. A second adjustment mounting plate is provided at the top of the first adjustment connecting plate. The linear array scanning camera is located below the first adjustment connecting plate and passes through the through hole to be connected to the first adjustment mounting plate. A second adjustment plate is provided on the second adjustment connecting plate at one end of the second adjustment mounting plate. A second adjustment groove is provided on the second adjustment plate. A second adjustment block is provided at one end of the second adjustment mounting plate. The second adjustment block is located in the second adjustment groove. A third adjustment screw and a fourth adjustment screw are respectively provided on the second adjustment plate on both sides of the second adjustment block. Threaded holes are provided on the second adjustment plate. The third adjustment screw and the fourth adjustment screw are located in the threaded holes. The third adjustment screw and the fourth adjustment screw approach each other and abut against both sides of the second adjustment block.

[0011] With the above settings, by providing the third adjustment screw and the fourth adjustment screw, when it is necessary to finely adjust the linear array scanning camera, rotate the third adjustment screw and the fourth adjustment screw so that the second adjustment mounting plate can rotate, thereby realizing the adjustment of the rotation angle of the linear array scanning camera. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural view of the detection mechanism of the present invention.

[0013] Figure 2 is a simple schematic view in which the vertical line of the first adjustment mounting plate of the present invention is perpendicular to the end face of the workbench.

[0014] Figure 3 is a simple schematic view of the deviation of the first adjustment mounting plate of the present invention.

[0015] Figure 4 is a simple schematic view in which the scanning line emitted by the linear array scanning camera of the present invention is parallel to the standard line set on the workbench.

[0016] Figure 5 is a simple schematic view of the deviation of the scanning line emitted by the linear array scanning camera of the present invention.

[0017] Figure 6 is Figure 1 an enlarged view of the F position in

[0018] Figure 7 is a schematic structural view of the first adjustment assembly of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described in detail below in conjunction with the specific embodiments.

[0020] As Figures 1 - 7 shown, a detection mechanism is provided on a frame (not shown in the figure). A workbench is provided on the frame below the detection mechanism, and a PCB board is placed on the workbench. In this embodiment, a limiting strip (not shown in the figure) for restricting the PCB board is provided on the outer edge of the workbench. The setting of the limiting strip enables the PCB board to play a role in positioning and limiting when placed on the workbench.

[0021] As Figure 1 shown, the detection mechanism 3 includes a detection frame 31, an adjustment device 4, and a line array scanning camera 32. The line array scanning camera 32 is arranged on the detection frame 31 through the adjustment device 4, and the detection end of the line array scanning camera 32 corresponds to the workbench 2. By providing the line array scanning camera 32, the line array scanning camera 32 is driven to move along the workbench 2 through a moving module (not shown in the figure), so as to ensure that the entire PCB board can be scanned, thereby ensuring that the blind holes of the PCB board can be detected.

[0022] As Figures 1 - 5 shown, the adjustment device 4 includes a first adjustment component 41 and a second adjustment component 42. The first adjustment component 41 is arranged on the detection frame 31, the second adjustment component 42 is arranged on the first adjustment component 41, and the line array scanning camera 32 is arranged on the second adjustment component 42. The first adjustment component 41 is used to adjust the perpendicularity α between the second adjustment component 42 and the horizontal plane of the workbench 2; the second adjustment component 42 is used to adjust the parallelism β between the scanning line of the line array scanning camera 32 and the front end face line of the workbench 2.

[0023] With the above settings, the position of the line array scanning camera is adjusted through the adjustment device, thereby improving the accuracy of blind hole detection.

[0024] As Figures 1 - 3 、 Figure 7As shown in the figure, the first adjustment component 41 includes a first adjustment mounting plate 411, a first adjustment mounting shaft 412, a first adjustment block 413, a first adjustment plate 414, a first adjustment screw 415, and a second adjustment screw 416. The first adjustment mounting shaft 412 is arranged on the detection frame 31. The center of the first adjustment mounting plate 411 is provided with a mounting hole corresponding to the first adjustment mounting shaft 412, and the first adjustment mounting plate 411 is arranged on the first adjustment mounting shaft 412. A first adjustment plate 414 is arranged on the detection frame 31 on one side of the first adjustment mounting plate 411. A first adjustment groove 4141 is provided on the first adjustment plate 414. A first adjustment block 413 is arranged on one side of the first adjustment mounting plate 411. The first adjustment block 413 is located in the first adjustment groove 4141. A first adjustment screw 415 and a second adjustment screw 416 are respectively arranged on the first adjustment plate 414 on both sides of the first adjustment block 413. A threaded hole 419 is provided on the first adjustment plate 414. The first adjustment screw 415 and the second adjustment screw 416 are located in the threaded hole. The first adjustment screw 415 and the second adjustment screw 416 are close to each other and abut against both sides of the first adjustment block 413. Through the arrangement of the first adjustment screw 415 and the second adjustment screw 416, when fine adjustment of the first adjustment mounting plate 411 is required, the first adjustment screw 415 and the second adjustment screw 416 are rotated, so that the first adjustment mounting plate 411 can rotate, thereby realizing the vertical angle adjustment of the first adjustment mounting plate 411.

[0025] In this embodiment, as Figure 2 shown, at this time, the vertical line a of the first adjustment mounting plate 411 is perpendicular to the end face b of the workbench 2. If the angle of the first adjustment mounting plate 411 is offset, as Figure 3 shown, the first adjustment mounting plate 411 is offset to the right. At this time, the second adjustment screw 416 is unscrewed away from the first adjustment block 413, and at the same time, the first adjustment screw 415 is turned so that the first adjustment screw 415 pushes the first adjustment block 413 to move in the direction of the second adjustment screw 416, thereby driving the first adjustment mounting plate 411 to rotate with the first adjustment mounting shaft 412 as the fulcrum so that the first adjustment mounting plate 411 is offset to the left and returns to the correct position (as shown by the arrow in Figure 3 ). When the vertical line a of the first adjustment mounting plate 411 is perpendicular to the end face b of the workbench 2, the first adjustment screw 415 and the second adjustment screw 416 are tightened simultaneously, thereby clamping and fixing the first adjustment block 413, so as to realize the vertical angle adjustment of the first adjustment mounting plate 411.

[0026] As Figure 1 , 4 - Figure 6As shown, the second adjustment assembly 42 includes a second adjustment mounting plate 421, a second adjustment connecting plate 422, a second adjustment block 423, a second adjustment plate 424, a third adjustment screw 425, and a fourth adjustment screw 426. The second adjustment connecting plate 422 is disposed on the first adjustment mounting plate 411. A through hole is provided at the center of the second adjustment connecting plate 422. At the top end of the first adjustment connecting plate 422, there is a second adjustment mounting plate 421. The linear array scanning camera 32 is located below the first adjustment connecting plate 422 and passes through the through hole to be connected to the first adjustment mounting plate 421. A second adjustment plate 424 is provided on the second adjustment connecting plate 422 at one end of the second adjustment mounting plate 421. A second adjustment groove 4241 is provided on the second adjustment plate 424. A second adjustment block 423 is provided at one end of the second adjustment mounting plate 421. The second adjustment block 423 is located within the second adjustment groove 4241. A third adjustment screw 425 and a fourth adjustment screw 426 are respectively provided on the second adjustment plate 424 on both sides of the second adjustment block 423. Threaded holes 429 are provided on the second adjustment plate 424. The third adjustment screw 425 and the fourth adjustment screw 426 are located within the threaded holes. The third adjustment screw 425 and the fourth adjustment screw 426 approach each other and abut against both sides of the second adjustment block 423. Through the arrangement of the third adjustment screw 425 and the fourth adjustment screw 426, when fine adjustment of the linear array scanning camera 32 is required, the third adjustment screw 425 and the fourth adjustment screw 426 are rotated, so that the second adjustment mounting plate 421 can rotate, thereby realizing the adjustment of the rotation angle of the linear array scanning camera 32.

[0027] In this embodiment, as Figure 4 shown, at this time, the scanning line c emitted by the linear array scanning camera 32 is in a parallel state with the standard line d set on the workbench (i.e., the scanning line can coincide with the standard line). If the rotation angle of the linear array scanning camera 32 is offset, as Figure 5 shown, the rotation angle of the linear array scanning camera 32 is offset to the right. At this time, the fourth adjustment screw 426 is unscrewed away from the second adjustment block 423, and at the same time, the third adjustment screw 425 is turned so that the third adjustment screw 425 pushes the second adjustment block 423 to move in the direction of the fourth adjustment screw 426, thereby driving the second adjustment mounting plate 421 to rotate so that the second adjustment mounting plate 421 is offset to the left to return to the correct position (as shown by the arrow in Figure 5 ). When the scanning line of the linear array scanning camera 32 is parallel to the standard line, the third adjustment screw 425 and the fourth adjustment screw 426 are tightened simultaneously, thereby clamping and fixing the second adjustment block 423, so as to realize the adjustment of the rotation angle of the linear array scanning camera 32.

[0028] Working principle of the utility model: By setting the first adjustment component and the second adjustment component, the detection mechanism can be adjusted, so that the line array scanning camera can be perpendicular to the horizontal plane, and the scanning line of the line array scanning camera can be parallel to the standard line set on the horizontal plane. In this way, when scanning and detecting blind holes, the position of each scanned blind hole can be determined, so that when comparing the blind holes of the current PCB board with the standard blind holes subsequently, a high measurement accuracy can be maintained. At the same time, by adjusting the perpendicularity of the line array scanning camera, it is ensured that the line array scanning camera can scan to the bottom of the blind hole, avoiding the problem that the depth measurement of the blind hole is inaccurate because the line array scanning camera can only scan the inner wall of the blind hole due to angle deviation.

Claims

1. A detection device for a PCB board, comprising a detection mechanism, characterized in that: The detection mechanism includes a detection frame, an adjustment device, and a linear array scanning camera. The linear array scanning camera is arranged on the detection frame through the adjustment device. The adjustment device includes a first adjustment component and a second adjustment component. The first adjustment component is arranged on the detection frame, and the second adjustment component is arranged on the first adjustment component. The linear array scanning camera is arranged on the second adjustment component. The first adjustment component is used to adjust the perpendicularity of the second adjustment component; the second adjustment component is used to adjust the parallelism of the scanning lines of the linear array scanning camera.

2. The detection device for a PCB board according to claim 1, wherein: The first adjustment component includes a first adjustment mounting plate, a first adjustment mounting shaft, a first adjustment block, a first adjustment plate, a first adjustment screw, and a second adjustment screw. The first adjustment mounting shaft is arranged on the detection frame. An installation hole corresponding to the first adjustment mounting shaft is provided at the center of the first adjustment mounting plate. The first adjustment mounting plate is arranged on the first adjustment mounting shaft. A first adjustment plate is provided on the detection frame on one side of the first adjustment mounting plate. A first adjustment groove is provided on the first adjustment plate. A first adjustment block is provided on one side of the first adjustment mounting plate. The first adjustment block is located in the first adjustment groove. A first adjustment screw and a second adjustment screw are respectively provided on the first adjustment plate on both sides of the first adjustment block. A threaded hole is provided on the first adjustment plate. The first adjustment screw and the second adjustment screw are located in the threaded hole. The first adjustment screw and the second adjustment screw approach each other and abut against both sides of the first adjustment block.

3. The detection device for a PCB board according to claim 2, characterized in that: The second adjustment component includes a second adjustment mounting plate, a second adjustment connecting plate, a second adjustment block, a second adjustment plate, a third adjustment screw, and a fourth adjustment screw. The second adjustment connecting plate is arranged on the first adjustment mounting plate. A through hole is provided at the center of the second adjustment connecting plate. A second adjustment mounting plate is provided at the top of the first adjustment connecting plate. The linear array scanning camera is located below the first adjustment connecting plate and passes through the through hole to be fixedly connected to the first adjustment mounting plate. A second adjustment plate is provided on the second adjustment connecting plate at one end of the second adjustment mounting plate. A second adjustment groove is provided on the second adjustment plate. A second adjustment block is provided at one end of the second adjustment mounting plate. The second adjustment block is located in the second adjustment groove. A third adjustment screw and a fourth adjustment screw are respectively provided on the second adjustment plate on both sides of the second adjustment block. A threaded hole is provided on the second adjustment plate. The third adjustment screw and the fourth adjustment screw are located in the threaded hole. The third adjustment screw and the fourth adjustment screw approach each other and abut against both sides of the second adjustment block.

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