Detection mechanism installation and adjustment method applied to PCB blind hole detection

Abstract

The invention provides a detection mechanism installation and adjustment method applied to PCB blind hole detection. An existing scanning camera is installed on a detection rack in advance, then a detection strip is detected through the linear array scanning camera to form a detection image of the detection strip, and the detection image is compared with a preset image of the detection strip to determine the horizontal deviation angle of the linear array scanning camera. The horizontal angle of the linear array scanning camera is adjusted according to the horizontal deviation angle of the linear array scanning camera, so that the linear array scanning camera is parallel to the horizontal direction of the horizontal plane, and then the vertical deviation angle of the linear array scanning camera is determined according to the included angle between the shooting point of the linear array scanning camera and the point where the actual axis is located. Therefore, the linear array scanning camera is ensured to be perpendicular to the detection plane, the angle micro-adjustment of the linear array scanning camera in the horizontal direction and the vertical direction can be conveniently realized, the linear array scanning camera is ensured to be reliably mounted in the horizontal plane, and the accuracy of subsequent testing is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of PCB board detection, and in particular to a detection mechanism installation and adjustment method applied to PCB blind hole detection. Background Art

[0002] Common defect detection methods for PCB boards include: manual visual inspection, electronic inspection and automatic optical inspection. Currently, automatic optical inspection is mainly used. Automatic optical inspection uses a high-resolution camera and a special light source to obtain PCB board images, and automatically detects defects on the PCB board through grayscale, binary processing, feature extraction, feature detection and template matching. It has the advantages of stability, reliability, high precision and high efficiency. For automatic optical inspection, if the installation of the detection device is inaccurate, it is easy to cause inaccurate detection results due to inaccurate installation of the detection device.

[0003] For example, the patent document with Chinese patent application number CN202121812195.1 and announcement date of 2021.12.28 discloses a PCB board optical inspection device and a 3D inspection camera assembly. The equipment includes: a Y-axis inspection mechanism, a vacuum adsorption workbench, an X-axis inspection mechanism, a Z-axis inspection mechanism and a 3D inspection camera assembly; the 3D inspection camera assembly includes a plurality of 3D camera structures arranged side by side, and the 3D camera structure includes a light source assembly, a 3D camera assembly, a camera rotation mount and an overall angle adjustment block; the camera rotation mount is mounted on the overall angle adjustment block in a rotatable and adjustable manner, and the light source assembly and the 3D camera assembly are respectively mounted on the camera rotation mount in a rotatable and adjustable manner, and the rotation axes of the light source assembly and the 3D camera assembly coincide and are parallel to the rotation axis of the camera rotation mount. The above structure can be used to meet the 3D inspection needs of filling blind holes on PCB boards, which helps to solve the problems of low inspection accuracy, high inspection cost, low inspection efficiency and poor stability in the prior art.

[0004] This document can detect blind holes on PCB boards, mainly by making the camera and the detection plane form a certain angle through an angle adjustment module, and the measurement is performed by lifting the measuring device in the height direction, which mainly makes the measuring device and the blind hole form a certain angle adjustment, and does not consider the problem of inaccurate detection caused by the entire angle device not being set parallel to the plane of the PCB board during the installation process, thereby causing errors in the scanning results. Summary of the invention

[0005] The object of the present invention is to provide a detection mechanism installation and adjustment method for PCB blind hole detection, which can determine the deviation angle according to the comparison between the image scanned by the detection mechanism and the preset image, so that the detection mechanism can be reliably installed to ensure the reliability of subsequent detection.

[0006] To achieve the above object, the present invention provides a detection mechanism installation and adjustment method for PCB blind hole detection, the specific steps comprising: (1) Pre-fix the linear array scanning camera on the detection frame through the adjustment device; (2) A line plate is provided below the detection mechanism.

[0007] (3) The line array scanning camera scans the lines on the line board to obtain a scanned image of the lines on the line board.

[0008] (4) By comparing the line scan image with the line scan image on the preset line board, the angle between the lines of the line scan image on the preset line board and the lines of the actual line board is obtained, and the horizontal offset angle of the line array scan camera is determined according to the angle.

[0009] (5) The vertical offset angle of the line scan camera is determined by the angle between the position of the line scan camera's emission point on the plane below the detection mechanism and the axis of the line scan camera.

[0010] (6) The linear array scan camera is adjusted by an adjustment device according to the horizontal offset angle of the linear array scan camera and the vertical angle of the linear array scan camera.

[0011] The detection mechanism comprises a detection frame, an adjustment device, and a linear array scanning camera, and the linear array scanning camera is arranged on the detection frame through the adjustment device.

[0012] The above method is to install the current scanning camera on the detection frame in advance, and then set a horizontally placed detection strip in the plane below the detection mechanism, and then detect the detection strip through the linear array scanning camera to form a detection image of the detection strip, and compare the detection image with the preset detection strip image to determine the horizontal offset angle of the linear array scanning camera, so as to adjust the horizontal angle of the linear array scanning camera according to the horizontal offset angle of the linear array scanning camera so that the linear array scanning camera is set parallel to the horizontal direction of the horizontal plane, and then determine the vertical offset angle of the linear array scanning camera by the angle between the point where the linear array scanning camera is printed and the point where the actual axis is located, so as to ensure that the linear array scanning camera is set vertically to the detection plane, so as to conveniently realize the fine adjustment of the horizontal and vertical angles of the linear array scanning camera, ensure that the linear array scanning camera can be reliably installed in the horizontal plane, and ensure the accuracy of subsequent tests.

[0013] Furthermore, the detection mechanism also includes a light source module, a through slot is provided at the center of the light source module, a scanning end of the linear array scanning camera is located above the through slot, and light sources are provided on both sides of the through slot.

[0014] In the above settings, the line array scan camera scans the PCB board located below the line array scan camera through the through slot. When the PCB board needs to be supplemented with brightness, the PCB board is illuminated by setting light sources on both sides of the through slot, so that the blind holes on the PCB board can be easily scanned.

[0015] Furthermore, the adjustment device includes a first adjustment component and a second adjustment component, the first adjustment component is arranged on the detection frame, 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 verticality of the second adjustment component; the second adjustment component is used to adjust the parallelism of the scanning line of the linear array scanning camera.

[0016] The above arrangement adjusts the position of the linear array scanning camera through the adjusting device, thereby improving the accuracy of blind hole detection.

[0017] 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 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 plates 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 are close to each other and abut against both sides of the first adjustment block; Step (6) specifically includes: S1 adjusts the verticality between the first adjustment component and the horizontal plane of the workbench.

[0018] S11 installs the first adjustment mounting plate on the first adjustment mounting shaft.

[0019] S12: rotating the first adjusting screw and the second adjusting screw so that the first adjusting screw and the second adjusting screw are close to each other and clamp the first adjusting block so that the first adjusting mounting plate is fixed.

[0020] S13: Rotate the first adjusting screw and the second adjusting screw in opposite directions according to the vertical angle of the linear array scanning camera, so that the first adjusting mounting plate is perpendicular to the horizontal plane of the workbench.

[0021] The above setting, through the setting of the first adjusting screw and the second adjusting screw, allows when it is necessary to fine-tune the first adjusting mounting plate, the first adjusting screw and the second adjusting screw are rotated so that the first adjusting mounting plate rotates the vertical angle of the linear array scanning camera in the opposite direction, thereby realizing the vertical angle adjustment of the first adjusting mounting plate.

[0022] Further, 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 arranged in the center of the second adjustment connecting plate, a second adjustment mounting plate is arranged on the top end of the first adjustment connecting plate, the linear array scanning camera is located below the first adjustment connecting plate and is fixedly connected to the first adjustment mounting plate through the through hole, a second adjustment plate is arranged on the second adjustment connecting plate at one end of the second adjustment mounting plate, a second adjustment slot is arranged on the second adjustment plate, a second adjustment block is arranged at one end of the second adjustment mounting plate, the second adjustment block is located in the second adjustment slot, a third adjustment screw and a fourth adjustment screw are respectively arranged on the second adjustment plates on both sides of the second adjustment block, a threaded hole is arranged 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 are close to each other and abut against both sides of the second adjustment block; Step (6) includes: S2 adjusts the parallelism between the scanning line of the linear scan camera and the front surface line of the workbench.

[0023] S23 adjusts the third adjusting screw and the fourth adjusting screw so that the second adjusting mounting plate rotates inversely the horizontal offset angle of the linear array scanning camera, so that the third adjusting screw and the fourth adjusting screw approach each other and clamp the second adjusting block so that the second adjusting mounting plate is fixed.

[0024] The above setting, through the setting of the third adjusting screw and the fourth adjusting screw, allows when it is necessary to fine-tune the linear array scanning camera, the third adjusting screw and the fourth adjusting screw are rotated so that the second adjustment mounting plate can rotate in the opposite direction, thereby realizing the rotation angle adjustment of the linear array scanning camera.

[0025] Furthermore, step (5) includes: (51) determining the emission point in the axial direction of the linear scanning camera in the detection plane, and then determining the position of the emission point of the linear array scanning camera on the plane below the detection mechanism, (52) comparing the emission point in the axial direction of the linear scanning camera with the position of the emission point of the linear array scanning machine on the plane below the detection mechanism to determine the distance difference between the two, and then determining the vertical offset angle of the linear array scanning camera based on the distance between the center of the preset linear scanning camera and the plane.

[0026] The above setting can determine the vertical offset angle of the line scan camera by the difference between the point emitted in the preset axis direction and the position of the actual emission point, which is convenient for calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of adjusting the linear scan camera of the present invention.

[0028] Figure 2 This is an adjustment flow chart of the first adjustment mounting plate of the present invention.

[0029] Figure 3 A simple schematic diagram showing that the vertical line of the first adjustment mounting plate is perpendicular to the end surface of the workbench.

[0030] Figure 4 It is a simple schematic diagram of the first adjustment of the offset of the mounting plate of the present invention.

[0031] Figure 5 It is a simple schematic diagram showing that the scanning lines emitted by the line scan camera of the present invention are in a parallel state with the standard lines set on the workbench.

[0032] Figure 6 FIG. 1 is a simple schematic diagram of the deviation of the scan line emitted by the line scan camera of the present invention.

[0033] Figure 7 Schematic diagram of the structure of a detection mechanism in one embodiment of the present invention.

[0034] Figure 8 for Figure 7 Enlarged view of point F in the middle.

[0035] Fig. 9 It is a schematic structural diagram of the first adjustment component of the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with specific implementation modes.

[0037] like Figure 3-Figure 9 As shown, a detection mechanism is arranged on a frame (not shown in the figure), a workbench is arranged on the frame below the detection mechanism, and a PCB board is placed on the workbench. In this embodiment, a limit bar (not shown in the figure) for limiting the PCB board is arranged on the outer edge of the workbench, and the setting of the limit bar enables the PCB board to be positioned and limited when placed on the workbench.

[0038] like Figure 7As shown, the detection mechanism 3 includes a detection frame 31, an adjustment device 4, a linear scan camera 32 and a light source module (not shown in the figure). The linear scan camera 32 is arranged on the detection frame 31 through the adjustment device 4, and a light source module is arranged on the detection frame 31 below the linear scan camera 32; the detection end of the linear scan camera 32 corresponds to the workbench 2. By setting the linear scan camera 32, the linear scan camera 32 is driven to move along the workbench 2 through the moving module (not shown in the figure), thereby ensuring that all PCB boards can be scanned, thereby ensuring that the blind holes of the PCB board can be detected.

[0039] A through slot is provided at the center of the light source module, and the scanning end of the linear array scanning camera 32 is located above the through slot 431, and light sources (not shown in the figure) are provided on both sides of the through slot. The linear array scanning camera 32 scans the PCB board on the workbench 2 through the through slot. When the PCB board needs to be supplemented with brightness, the PCB board is illuminated by light sources provided on both sides of the through slot, so that the blind holes on the PCB board can be easily scanned.

[0040] like Figure 3-Figure 9 As shown, the adjusting device 4 includes a first adjusting component 41 and a second adjusting component 42, the first adjusting component 41 is arranged on one side of the rear end of the detection frame 31, the second adjusting component 42 is arranged on the first adjusting component 41, the upper end of the linear array scanning camera 32 is arranged on the second adjusting component 42, the first adjusting component 41 is used to adjust the verticality α between the second adjusting component 42 and the horizontal plane of the workbench 2; the second adjusting component 42 is used to adjust the parallelism β between the scanning line of the linear array scanning camera 32 and the front end surface line of the workbench 2.

[0041] The above arrangement adjusts the position of the linear array scanning camera through the adjusting device, thereby improving the accuracy of blind hole detection.

[0042] like Figure 7-Figure 8 , Fig. 9As shown, 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. The first adjustment mounting plate 411 is arranged on the first adjustment mounting shaft 412. The detection frame 31 on one side of the first adjustment mounting plate 411 is provided with a first adjustment plate 414. 14 is provided with a first adjustment slot 4141, a first adjustment block 413 is provided on one side of the first adjustment mounting plate 411, the first adjustment block 413 is located in the first adjustment slot 4141, a first adjustment screw 415 and a second adjustment screw 416 are respectively provided on the first adjustment plate 414 on both sides of the first adjustment block 413, a threaded hole (not shown in the figure) 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, and 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 provision of the first adjustment screw 415 and the second adjustment screw 416, when it is necessary to fine-tune the first adjustment mounting plate 411, the first adjustment screw 415 and the second adjustment screw 416 are rotated so that the first adjustment mounting plate 411 can be rotated, thereby realizing the vertical angle adjustment of the first adjustment mounting plate 411.

[0043] like Figure 7 , 4 - Figure 6As shown, the second adjustment component 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 arranged on the first adjustment mounting plate 411. A through hole is provided in the center of the second adjustment connecting plate 422. A second adjustment mounting plate 421 is provided at the top of the first adjustment connecting plate 422. After the second adjustment mounting plate 421 is clamped at the upper end of the first adjustment connecting plate 422, it can be fine-tuned on the first adjustment connecting plate 422. In this embodiment, a mounting hole is provided on the second adjustment mounting plate 421, and a first mounting hole corresponding to the mounting hole is provided on the first adjustment connecting plate 422. Screws are provided in the mounting hole and the first mounting hole. When fine-tuning, the screws in the mounting hole and the first mounting hole are loosened, and then the position is adjusted and locked to achieve fine-tuning and fixation. The linear array scanning camera 32 is located below the first adjusting connecting plate 422 and is fixedly connected to the first adjusting mounting plate 421 through a through hole. A second adjusting plate 424 is provided on the second adjusting connecting plate 422 at one end of the second adjusting mounting plate 421, and a second adjusting groove 4241 is provided on the second adjusting plate 424. A second adjusting block 423 is provided at one end of the second adjusting mounting plate 421. The second adjusting block 423 is located in the second adjusting groove 4241. A third adjusting screw 425 and a fourth adjusting screw 426 are respectively provided on the second adjusting plates 424 on both sides of the second adjusting block 423. A threaded hole (not shown in the figure) is provided on the second adjusting plate 424. The third adjusting screw 425 and the fourth adjusting screw 426 are located in the threaded hole. The third adjusting screw 425 and the fourth adjusting screw 426 are close to each other and abut against both sides of the second adjusting block 423. By setting the third adjusting screw 425 and the fourth adjusting screw 426, when the linear array scanning camera 32 needs to be fine-tuned, the third adjusting screw 425 and the fourth adjusting screw 426 are rotated to allow the second adjustment mounting plate 421 to rotate, thereby achieving the rotation angle adjustment of the linear array scanning camera 32.

[0044] like Figure 1-Figure 2 As shown, a detection mechanism installation and adjustment method for PCB blind hole detection, the specific steps include: (1) Pre-fix the linear scan camera 32 on the detection frame 31 through the adjustment device 4; (2) A line plate is provided below the detection mechanism.

[0045] (3) The line array scanning camera 32 scans the lines on the line board to obtain a scanned image of the lines on the line board.

[0046] (4) By comparing the line scan image with the line scan image on the preset line board, the angle between the lines of the line scan image on the preset line board and the lines of the actual line board is obtained, and the horizontal offset angle B of the line array scan camera is determined based on the angle.

[0047] (5) The vertical offset angle A of the line scan camera is determined by the angle between the position of the line scan camera emission point on the plane below the detection mechanism and the position of the line scan camera axis on the detection plane.

[0048] Step (5) specifically includes: (51) determining the point b emitted in the axis direction of the linear scanning camera in the detection plane, and then determining the position b1 of the point emitted by the linear array scanning camera on the plane below the detection mechanism, (52) comparing the point emitted in the axis direction of the linear scanning camera with the position of the point emitted by the linear array scanner on the plane below the detection mechanism to determine the distance difference between the two, and then determining the vertical offset angle A of the linear array scanning camera according to the distance between the preset center of the linear scanning camera and the plane. In this embodiment, the distance difference D1 between the point preset in the detection plane and the point measured by the linear array scanner can be measured by a rangefinder, and then the distance between the preset center of the linear scanning camera and the detection plane can be set by a distance detector at the center of the detection frame, and then the distance D between the center of the detection frame and the detection plane can be measured, and then the vertical offset angle A of the linear array scanning camera can be calculated by arctan (D1 / D).

[0049] (6) The linear array scan camera is adjusted by an adjustment device according to a horizontal offset angle B of the linear array scan camera and a vertical angle A of the linear array scan camera.

[0050] Step (6) specifically includes: S1 adjusts the verticality between the first adjusting component 41 and the horizontal plane of the workbench 2.

[0051] S11: Install the first adjustment mounting plate 411 on the first adjustment mounting shaft 412.

[0052] S12 rotates the first adjusting screw 415 and the second adjusting screw 416 so that the first adjusting screw 415 and the second adjusting screw 416 are close to each other and clamp the first adjusting block 413 so that the first adjusting mounting plate 411 is fixed.

[0053] S13: Rotate the first adjusting screw and the second adjusting screw in opposite directions according to the vertical angle of the linear array scanning camera, so that the first adjusting mounting plate is perpendicular to the horizontal plane of the workbench.

[0054] Step S13 specifically includes: in this embodiment, Figure 3As shown, at this time, the axis a of the first adjustment mounting plate 411 is perpendicular to the straight line b where the upper end surface of the workbench 2 is located. If the angle of the first adjustment mounting plate 411 is offset, as shown in FIG. Figure 4 As shown, the first adjustment mounting plate 411 is offset to the left. At this time, the first adjustment screw 415 is unscrewed away from the first adjustment block 413, and the second adjustment screw 416 is screwed so that the second adjustment screw 416 pushes the first adjustment block 413 to move in the direction of the first adjustment screw 415, 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 right and returned to normal (as shown in FIG. Figure 4 As shown by the arrow in the middle, when the vertical line a of the first adjustment mounting plate 411 is perpendicular to the end surface b of the workbench 2, the first adjustment screw 415 and the second adjustment screw 416 are tightened at the same time, thereby clamping and fixing the first adjustment block 413, thereby realizing the vertical angle adjustment of the first adjustment mounting plate 411.

[0055] S2 adjusts the parallelism between the scanning line of the linear array scanning camera and the front surface line of the detection plane.

[0056] S23 adjusts the third adjusting screw and the fourth adjusting screw so that the second adjusting mounting plate rotates inversely the horizontal offset angle of the linear array scanning camera, so that the third adjusting screw and the fourth adjusting screw approach each other and clamp the second adjusting block so that the second adjusting mounting plate is fixed.

[0057] Step S23 specifically includes: In this embodiment, if Figure 5 As shown, at this time, the line c scanned by the line scan camera 32 is parallel to the line d of the actual line board (that is, the line of the line scan image can overlap with the line of the actual line board). If the rotation angle of the line scan camera 32 is offset, such as Figure 6 As shown, the rotation angle of the line scan camera 32 is offset to the rear side. At this time, an angle is formed between the line c and the line d. At this time, the fourth adjusting screw 426 is unscrewed away from the second adjusting block 423, and the third adjusting screw 425 is screwed so that the third adjusting screw 425 pushes the second adjusting block 423 to move in the direction of the fourth adjusting screw 426, thereby driving the second adjusting mounting plate 421 to rotate so that the second adjusting mounting plate 421 is offset to the front side and returned to normal (as shown in FIG. Figure 6 As shown by the arrow in the middle, when the scanning line of the linear array scanning camera 32 is parallel to the standard line, the third adjusting screw 425 and the fourth adjusting screw 426 are tightened at the same time, thereby clamping and fixing the second adjusting block 423, thereby achieving the adjustment of the rotation angle of the linear array scanning camera 32.

[0058] The working principle of the present invention is as follows: by adjusting the detection mechanism, the linear array scanning camera can be perpendicular to the horizontal plane, and the scanning line of the linear array scanning camera can be kept parallel to the standard line set on the horizontal plane, so that when the blind hole is scanned and detected, the position of each scanned blind hole can be determined, thereby maintaining a high measurement accuracy when the blind hole of the current PCB board is subsequently compared with the standard blind hole, and at the same time, by adjusting the verticality of the linear array scanning camera, it is ensured that the linear array scanning camera can scan the bottom of the blind hole, avoiding the problem of inaccurate depth measurement of the blind hole because the linear array scanning camera can only scan the inner wall of the blind hole due to angle deviation.

Claims

1. A detection mechanism installation and adjustment method for PCB blind hole detection, characterized in that: The specific steps include: (1) Pre-fix the linear array scanning camera on the detection frame through the adjustment device; (2) A line plate is provided below the detection mechanism; (3) The line array scanning camera scans the lines on the line board to obtain a scanned image of the lines on the line board; (4) By comparing the line scan image with the line scan image on the preset line board, the angle between the lines of the line scan image on the preset line board and the lines of the actual line board is obtained, and the horizontal offset angle of the line scan camera is determined according to the angle; (5) Determine the vertical offset angle of the line scan camera by taking the position of the line scan camera emission point on the plane below the detection mechanism and the angle between the line scan camera axis; (6) adjusting the line scan camera through an adjustment device according to a horizontal offset angle of the line scan camera and a vertical angle of the line scan camera; The detection mechanism comprises a detection frame, an adjustment device, and a linear array scanning camera, and the linear array scanning camera is arranged on the detection frame through the adjustment device.

2. The method for installing and adjusting a detection mechanism for PCB blind hole detection according to claim 1, characterized in that: The detection mechanism also includes a light source module, a through slot is arranged at the center of the light source module, a scanning end of the linear array scanning camera is located above the through slot, and light sources are arranged on both sides of the through slot.

3. The method for installing and adjusting a detection mechanism for PCB blind hole detection according to claim 1, characterized in that: 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 verticality of the second adjustment component; the second adjustment component is used to adjust the parallelism of the scanning line of the linear array scanning camera.

4. The method for installing and adjusting a detection mechanism for PCB blind hole detection according to claim 3 is characterized in that: The first adjustment component comprises 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 being arranged on the detection frame, a mounting hole corresponding to the first adjustment mounting shaft being arranged at the center of the first adjustment mounting plate, the first adjustment mounting plate being arranged on the first adjustment mounting shaft, a first adjustment plate being arranged on the detection frame on one side of the first adjustment mounting plate, a first adjustment groove being arranged on the first adjustment plate, a first adjustment block being arranged on one side of the first adjustment mounting plate, the first adjustment block being located in the first adjustment groove, a first adjustment screw and a second adjustment screw being arranged on the first adjustment plates on both sides of the first adjustment block respectively, a threaded hole being arranged on the first adjustment plate, the first adjustment screw and the second adjustment screw being located in the threaded hole, the first adjustment screw and the second adjustment screw being close to each other and abutting against both sides of the first adjustment block; Step (6) specifically includes: S1 adjusts the verticality between the first adjustment component and the horizontal plane of the workbench; S11: installing the first adjustment mounting plate on the first adjustment mounting shaft; S12: rotating the first adjusting screw and the second adjusting screw so that the first adjusting screw and the second adjusting screw are close to each other and clamp the first adjusting block so that the first adjusting mounting plate is fixed; S13: Rotate the first adjusting screw and the second adjusting screw in opposite directions according to the vertical angle of the linear array scanning camera, so that the first adjusting mounting plate is perpendicular to the horizontal plane of the workbench.

5. The method for installing and adjusting a detection mechanism for PCB blind hole detection according to claim 3 is characterized in that: The second adjustment component comprises 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 being arranged on the first adjustment mounting plate, a through hole being arranged at the center of the second adjustment connecting plate, a second adjustment mounting plate being arranged at the top end of the first adjustment connecting plate, a linear array scanning camera being arranged below the first adjustment connecting plate and being fixedly connected to the first adjustment mounting plate through the through hole, a second adjustment plate being arranged on the second adjustment connecting plate at one end of the second adjustment mounting plate, a second adjustment slot being arranged on the second adjustment plate, a second adjustment block being arranged at one end of the second adjustment mounting plate, the second adjustment block being arranged in the second adjustment slot, a third adjustment screw and a fourth adjustment screw being arranged on the second adjustment plates on both sides of the second adjustment block respectively, a threaded hole being arranged on the second adjustment plate, the third adjustment screw and the fourth adjustment screw being arranged in the threaded hole, the third adjustment screw and the fourth adjustment screw being close to each other and abutting against both sides of the second adjustment block; Step (6) includes: S2 adjusts the parallelism between the scanning line of the linear scan camera and the front surface line of the workbench; S23 adjusts the third adjusting screw and the fourth adjusting screw so that the second adjusting mounting plate rotates inversely the horizontal offset angle of the linear array scanning camera, so that the third adjusting screw and the fourth adjusting screw approach each other and clamp the second adjusting block so that the second adjusting mounting plate is fixed.

6. The method for installing and adjusting a detection mechanism for PCB blind hole detection according to claim 3, characterized in that: Step (5) includes: (51) determining the emission point in the axial direction of the linear scanning camera in the detection plane, and then determining the position of the emission point of the linear array scanning camera on the plane below the detection mechanism, (52) comparing the emission point in the axial direction of the linear scanning camera with the position of the emission point of the linear array scanning machine on the plane below the detection mechanism to determine the distance difference between the two, and then determining the vertical offset angle of the linear array scanning camera based on the distance between the center of the preset linear scanning camera and the plane.

Images