A detection mechanism installation adjustment method applied to PCB blind hole detection

Abstract

The application provides a detection mechanism installation adjustment method applied to PCB blind hole detection; the existing scanning camera is installed on a detection rack in advance, then a detection strip is detected by the linear array scanning camera to form a detection image of the detection strip, the detection image is compared with a preset image of the detection strip to determine a horizontal offset angle of the linear array scanning camera, the horizontal angle of the linear array scanning camera is adjusted according to the horizontal offset angle of the linear array scanning camera, so that the linear array scanning camera is arranged in parallel with the horizontal direction of the horizontal plane, then an included angle between a point shot by the linear array scanning camera and a point on the actual axis is determined to determine a vertical offset angle of the linear array scanning camera, so that the linear array scanning camera is arranged perpendicularly to the detection plane, thereby conveniently realizing the micro-adjustment of the horizontal direction and the vertical direction angle of the linear array scanning camera, ensuring that the linear array scanning camera can be reliably installed in the horizontal plane, and ensuring the accuracy of subsequent tests.

Description

Technical Field

[0001] This invention relates to the field of PCB board inspection technology, and specifically to a method for installing and adjusting an inspection mechanism for PCB blind via inspection. Background Technology

[0002] Commonly used defect detection methods for PCB boards include manual visual inspection, electronic inspection, and automated optical inspection. Currently, automated optical inspection is mainly used. Automated optical inspection uses a high-resolution camera and a special light source to acquire images of the PCB board. After grayscale conversion, binary processing, feature extraction, feature detection, and template matching, it automatically detects defects on the PCB board. It has the advantages of stability, reliability, high precision, and high efficiency. However, for automated optical inspection, if the detection device is not installed accurately, it can easily lead to inaccurate detection results.

[0003] For example, Chinese patent application CN202121812195.1, published on December 28, 2021, discloses an optical inspection device for PCB boards and a 3D inspection camera assembly. The device includes: a Y-axis inspection mechanism, a vacuum adsorption stage, an X-axis inspection mechanism, a Z-axis inspection mechanism, and a 3D inspection camera assembly. The 3D inspection camera assembly includes multiple 3D camera structures arranged side-by-side. Each 3D camera structure includes a light source assembly, a 3D camera assembly, a camera rotating mount, and an overall angle adjustment block. The camera rotating mount is rotatably mounted on the overall angle adjustment block. The light source assembly and the 3D camera assembly are rotatably mounted on the camera rotating mount, with their rotation axes coinciding and parallel to the rotation axis of the camera rotating mount. This structure can meet the 3D inspection requirements for blind hole filling on PCB boards, helping to solve the problems of low inspection accuracy, high inspection cost, low inspection efficiency, and poor stability in existing technologies.

[0004] This document describes a method for detecting blind vias on PCBs. It primarily uses an angle adjustment module to make the camera and the detection plane form a certain angle. The measurement is performed by raising and lowering the measuring device. The main purpose is to adjust the angle between the measuring device and the blind via. However, it does not consider the possibility that the entire angle device may not be parallel to the plane of the PCB during installation, which could lead to errors in the scanning results and inaccurate detection. Summary of the Invention

[0005] The purpose of this invention is to provide a method for installing and adjusting a detection mechanism for PCB blind via inspection. This method can determine the deviation angle by comparing the image scanned by the detection mechanism with a preset image, thereby enabling reliable installation of the detection mechanism and ensuring the reliability of subsequent inspections.

[0006] To achieve the above objectives, this invention provides a method for installing and adjusting a detection mechanism for PCB blind via inspection, the specific steps of which include:

[0007] (1) The linear scan camera is pre-fixed on the inspection frame using the adjustment device;

[0008] (2) Set up a line board below the testing mechanism.

[0009] (3) The line scan camera scans the lines on the line board to obtain a scanned image of the lines on the line board.

[0010] (4) By comparing the line scan image with the line scan image on the preset line board, the angle between the line scan image on the preset line board and the line on the actual line board is obtained, and the horizontal offset angle of the line scan camera is determined based on the angle.

[0011] (5) Determine the vertical offset angle of the line scan camera by the position of the emission point of the line scan camera on the plane below the detection mechanism and the angle between the line scan camera and the axis of the line scan camera.

[0012] (6) Adjust the line scan camera using the adjustment device according to the horizontal offset angle and the vertical angle of the line scan camera.

[0013] The testing mechanism includes a testing frame, an adjustment device, and a linear scan camera, wherein the linear scan camera is mounted on the testing frame via the adjustment device.

[0014] The above method involves pre-installing an existing scanning camera on the inspection frame, then setting a horizontally placed inspection strip in the plane below the inspection mechanism. The line scan camera then inspects the inspection strip to form an inspection image. This image is compared with the pre-set inspection strip image to determine the horizontal offset angle of the line scan camera. The horizontal angle of the line scan camera is then adjusted to ensure it is parallel to the horizontal plane. Finally, the vertical offset angle of the line scan camera is determined by the angle between the point where the camera outputs the image and the actual axis point, ensuring the line scan camera is perpendicular to the inspection plane. This allows for convenient fine-tuning of the horizontal and vertical angles of the line scan camera, ensuring reliable installation in the horizontal plane and guaranteeing the accuracy of subsequent tests.

[0015] Furthermore, the testing mechanism also includes a light source module, with a through slot in the center of the light source module, the scanning end of the linear scan camera located above the through slot, and light sources located on both sides of the through slot.

[0016] With the above settings, the linear scanning camera scans the PCB board located below the linear scanning camera through the through slot. When it is necessary to supplement the brightness of the PCB board, the light source on both sides of the through slot is set to illuminate the PCB board, so that the blind holes on the PCB board can be easily scanned.

[0017] Furthermore, the adjustment device includes a first adjustment component and a second adjustment component. The first adjustment component is mounted on the inspection frame, and the second adjustment component is mounted on the first adjustment component. The line scan camera is mounted on the second adjustment component. The first adjustment component is used to adjust the verticality of the second adjustment component, and the second adjustment component is used to adjust the parallelism of the scan lines of the line scan camera.

[0018] The above settings improve the accuracy of blind hole detection by adjusting the position of the linear scan camera using an adjustment device.

[0019] Furthermore, the first adjustment assembly 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 mounted on the testing frame. The center of the first adjustment mounting plate has a mounting hole corresponding to the first adjustment mounting shaft. The first adjustment mounting plate is mounted on the first adjustment mounting shaft. The first adjustment plate is mounted on the testing frame on one side of the first adjustment mounting plate. The first adjustment plate has a first adjustment groove. The first adjustment block is located in the first adjustment groove on one side of the first adjustment mounting plate. The first adjustment screw and the second adjustment screw are respectively mounted on the first adjustment plates on both sides of the first adjustment block. The first adjustment plate has a threaded hole. 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.

[0020] Step (6) specifically includes:

[0021] S1 adjusts the perpendicularity of the first adjustment component to the horizontal plane of the worktable.

[0022] S11 mounts the first adjustment mounting plate onto the first adjustment mounting shaft.

[0023] S12 rotates the first adjusting screw and the second adjusting screw, so that the first adjusting screw and the second adjusting screw move closer to each other and clamp the first adjusting block, thereby fixing the first adjusting mounting plate.

[0024] S13 rotates the first and second adjusting screws in the opposite direction according to the vertical angle of the linear scan camera, so that the first adjusting mounting plate is perpendicular to the horizontal plane of the worktable.

[0025] The above settings, through the configuration of the first and second adjusting screws, allow the first adjusting mounting plate to be adjusted vertically when fine adjustments are needed. By rotating the first and second adjusting screws, the vertical angle of the linear scan camera is reversed, thereby achieving the adjustment of the vertical angle of the first adjusting mounting plate.

[0026] Furthermore, 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, and a through hole is provided in the center of the second adjustment connecting plate. The second adjustment mounting plate is provided at the top of the first adjustment connecting plate. The linear scan 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, and 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, and 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 plates on both sides of the second adjustment block. Threaded holes are provided on the second adjustment plate, and the third adjustment screw and the fourth adjustment screw are located in the threaded holes. The third adjustment screw and the fourth adjustment screw are close to each other and abut against both sides of the second adjustment block.

[0027] Step (6) includes:

[0028] S2 adjusts the parallelism between the scan lines of the linear scan camera and the front face of the worktable.

[0029] S23 adjusts the third and fourth adjusting screws to cause the second adjusting mounting plate to rotate in the opposite direction to the horizontal offset angle of the linear scan camera, so that the third and fourth adjusting screws move closer to each other and clamp the second adjusting block, thereby fixing the second adjusting mounting plate.

[0030] The above settings, through the configuration of the third and fourth adjusting screws, allow the second adjusting mounting plate to rotate in the opposite direction when fine adjustments to the line scan camera are needed, thereby achieving the adjustment of the rotation angle of the line scan camera.

[0031] Further, step (5) includes: (51) determining the emission point of the linear scanning camera axis direction in the detection plane, and then determining the position of the emission point of the linear scanning camera on the plane below the detection mechanism; (52) comparing the emission point of the linear scanning camera axis direction with the position of the emission point of the linear scanning camera 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 scanning camera based on the preset distance between the center of the linear scanning camera and the plane.

[0032] The above settings can determine the vertical offset angle of the linear scan camera by the difference between the position of the point emitted from the preset axis direction and the actual point of emission, which is convenient for calculation. Attached Figure Description

[0033] Figure 1 This is a flowchart illustrating the adjustment process of the linear scan camera of the present invention.

[0034] Figure 2 This is a flowchart illustrating the adjustment process of the first adjustment mounting plate of the present invention.

[0035] Figure 3 A simplified diagram showing that the vertical line of the first adjustment mounting plate is perpendicular to the end face of the worktable.

[0036] Figure 4 This is a simplified schematic diagram of the first adjustment mounting plate offset of the present invention.

[0037] Figure 5 This is a simplified schematic diagram showing that the scan lines emitted by the linear scan camera of the present invention are parallel to the standard lines set on the worktable.

[0038] Figure 6 This is a simplified schematic diagram of the offset of the scan lines emitted by the linear scan camera of the present invention.

[0039] Figure 7 This is a schematic diagram of the detection mechanism in one embodiment of the present invention.

[0040] Figure 8 for Figure 7 Enlarged view of point F in the middle.

[0041] Figure 9 This is a schematic diagram of the structure of the first adjustment component of the present invention. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to specific embodiments.

[0043] like Figures 3-9 As shown, a testing mechanism is mounted on a frame (not shown in the figure). A worktable is provided on the frame below the testing mechanism, and a PCB board is placed on the worktable. In this embodiment, a limiting strip (not shown in the figure) is provided on the outer edge of the worktable to restrict the PCB board. The limiting strip is provided to position and limit the PCB board when it is placed on the worktable.

[0044] like Figure 7As shown, the detection mechanism 3 includes a detection frame 31, an adjustment device 4, a line scan camera 32, and a light source module (not shown in the figure). The line scan camera 32 is mounted on the detection frame 31 via the adjustment device 4, and the light source module is located on the detection frame 31 below the line scan camera 32. The detection end of the line scan camera 32 corresponds to the worktable 2. By setting up the line scan camera 32, the moving module (not shown in the figure) drives the line scan camera 32 to move along the worktable 2, thereby ensuring that the entire PCB board can be scanned, thus ensuring that blind holes on the PCB board can be detected.

[0045] A through slot is provided in the center of the light source module. The scanning end of the linear scan camera 32 is located above the through slot 431. Light sources (not shown in the figure) are provided on both sides of the through slot. The linear scan camera 32 scans the PCB board on the worktable 2 through the through slot. When it is necessary to supplement the brightness of the PCB board, the light sources on both sides of the through slot are set to illuminate the PCB board, so that the blind holes on the PCB board can be easily scanned.

[0046] like Figures 3-9 As shown, the adjustment device 4 includes a first adjustment component 41 and a second adjustment component 42. The first adjustment component 41 is disposed on one side of the rear end of the detection frame 31, and the second adjustment component 42 is disposed on the first adjustment component 41. The upper end of the line scan camera 32 is disposed 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 worktable 2; the second adjustment component 42 is used to adjust the parallelism β between the scan line of the line scan camera 32 and the front end face line of the worktable 2.

[0047] The above settings improve the accuracy of blind hole detection by adjusting the position of the linear scan camera using an adjustment device.

[0048] like Figures 7-8 , Figure 9As shown, the first adjustment assembly 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 mounted on the testing frame 31. The center of the first adjustment mounting plate 411 has a mounting hole corresponding to the first adjustment mounting shaft 412. The first adjustment mounting plate 411 is mounted on the first adjustment mounting shaft 412. The first adjustment plate 414 is mounted on the testing frame 31 on one side of the first adjustment mounting plate 411. The first adjustment plate 4141 is provided with a first adjustment groove 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 groove 4141. A first adjustment screw 415 and a second adjustment screw 416 are respectively provided on the first adjustment plates 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. 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. By setting the first adjustment screw 415 and the second adjustment screw 416, when it is necessary to make a fine adjustment to the first adjustment mounting plate 411, the first adjustment mounting plate 411 can be rotated by rotating the first adjustment screw 415 and the second adjustment screw 416, thereby realizing the vertical angle adjustment of the first adjustment mounting plate 411.

[0049] 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 disposed on the first adjustment mounting plate 411. The center of the second adjustment connecting plate 422 is provided with a through hole. The 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 engaged with the upper end of the first adjustment connecting plate 422, it can be finely adjusted on the first adjustment connecting plate 422. In this embodiment, the second adjustment mounting plate 421 is provided with a mounting hole, and the first adjustment connecting plate 422 is provided with a first mounting hole corresponding to the mounting hole. Screws are provided in the mounting hole and the first mounting hole. During fine adjustment, the screws in the mounting hole and the first mounting hole are loosened, and then the position is adjusted and locked to achieve fine adjustment and fixation. The linear scan camera 32 is located below the first adjustment connecting plate 422 and is fixedly connected to the first adjustment mounting plate 421 through the through hole. 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 in 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. A threaded hole (not shown in the figure) is provided on the second adjustment plate 424. The third adjustment screw 425 and the fourth adjustment screw 426 are located in the threaded hole. The third adjustment screw 425 and the fourth adjustment screw 426 are close to each other and abut against both sides of the second adjustment block 423. By setting the third adjusting screw 425 and the fourth adjusting screw 426, when it is necessary to fine-tune the line scan camera 32, rotating the third adjusting screw 425 and the fourth adjusting screw 426 allows the second adjusting mounting plate 421 to rotate, thereby realizing the rotation angle adjustment of the line scan camera 32.

[0050] like Figures 1-2 As shown, a method for installing and adjusting a detection mechanism applied to PCB blind via detection includes the following steps:

[0051] (1) The linear scan camera 32 is pre-fixed on the inspection frame 31 by means of the adjustment device 4;

[0052] (2) Set up a line board below the testing mechanism.

[0053] (3) The linear scanning camera 32 scans the lines on the line board to obtain a scanned image of the lines on the line board.

[0054] (4) By comparing the line scan image with the line scan image on the preset line board, the angle between the line scan image on the preset line board and the line on the actual line board is obtained, and the horizontal offset angle B of the line scan camera is determined based on the angle.

[0055] (5) Determine the vertical offset angle A of the line scan camera by the angle between the position of the emission point of the line scan camera on the plane below the detection mechanism and the position of the axis of the line scan camera on the detection plane.

[0056] Step (5) specifically includes: (51) determining the point b emitted by the linear scanning camera axis in the detection plane, and then determining the position b1 of the point emitted by the linear scanning camera on the plane below the detection mechanism; (52) comparing the point emitted by the linear scanning camera axis with the point emitted by the linear scanning camera 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 scanning camera based on the distance between the center of the linear scanning camera and the plane. In this embodiment, the distance difference D1 between the point on the detection plane and the point measured by the linear scanning camera can be measured by a rangefinder. Then, the distance between the center of the linear scanning camera and the detection plane can be measured by setting 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. Then, the vertical offset angle A of the linear scanning camera can be calculated by arctan(D1 / D).

[0057] (6) Adjust the line scan camera using the adjustment device according to the horizontal offset angle B and the vertical angle A of the line scan camera.

[0058] Step (6) specifically includes:

[0059] S1 adjusts the perpendicularity of the first adjustment component 41 to the horizontal plane of the worktable 2.

[0060] S11 mounts the first adjustment mounting plate 411 onto the first adjustment mounting shaft 412.

[0061] 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 move closer to each other and clamp the first adjusting block 413, thereby fixing the first adjusting mounting plate 411.

[0062] S13 rotates the first and second adjusting screws in the opposite direction according to the vertical angle of the linear scan camera, so that the first adjusting mounting plate is perpendicular to the horizontal plane of the worktable.

[0063] Step S13 specifically includes: In this embodiment, as follows Figure 3As shown, at this time, the axis a of the first adjusting mounting plate 411 is perpendicular to the straight line b containing the upper end surface of the worktable 2. If the angle of the first adjusting mounting plate 411 is offset, such as... Figure 4 As shown, the first adjusting mounting plate 411 is offset to the left. At this time, the first adjusting screw 415 is unscrewed away from the first adjusting block 413, and the second adjusting screw 416 is turned, causing the second adjusting screw 416 to push the first adjusting block 413 to move in the direction of the first adjusting screw 415. This, in turn, causes the first adjusting mounting plate 411 to rotate about the first adjusting mounting shaft 412 as a fulcrum, causing the first adjusting mounting plate 411 to offset to the right and return to the correct position (e.g., Figure 4 As shown by the middle arrow, when the vertical line a of the first adjusting mounting plate 411 is perpendicular to the end face b of the workbench 2, the first adjusting screw 415 and the second adjusting screw 416 are tightened simultaneously, thereby clamping and fixing the first adjusting block 413, thus realizing the vertical angle adjustment of the first adjusting mounting plate 411.

[0064] S2 adjusts the parallelism between the scan lines of the linear scan camera and the front surface line of the detection plane.

[0065] S23 adjusts the third and fourth adjusting screws to cause the second adjusting mounting plate to rotate in the opposite direction to the horizontal offset angle of the linear scan camera, so that the third and fourth adjusting screws move closer to each other and clamp the second adjusting block, thereby fixing the second adjusting mounting plate.

[0066] Step S23 specifically includes: In this embodiment, as follows 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 plate (that is, the lines in the scanned image and the lines in the actual line plate can coincide). If the rotation angle of the line scan camera 32 is offset, such as Figure 6 The rotation angle of the linear scan camera 32 shown is shifted to the rear, at which point an angle is formed between line c and line d. At this time, the fourth adjusting screw 426 is unscrewed away from the second adjusting block 423, while the third adjusting screw 425 is simultaneously turned, causing the third adjusting screw 425 to push the second adjusting block 423 towards the direction of the fourth adjusting screw 426. This, in turn, causes the second adjusting mounting plate 421 to rotate, causing the second adjusting mounting plate 421 to shift forward and return to its original position (e.g., ...). Figure 6 (As shown by the middle arrow) When the scan line of the linear scan camera 32 is parallel to the standard line, the third adjusting screw 425 and the fourth adjusting screw 426 are tightened simultaneously, thereby clamping and fixing the second adjusting block 423, thus realizing the adjustment of the rotation angle of the linear scan camera 32.

[0067] The working principle of this invention is as follows: By adjusting the detection mechanism, the linear scanning camera can be made perpendicular to the horizontal plane, and the scanning lines of the linear scanning camera can be kept parallel to the standard lines set on the horizontal plane. This ensures that the position of each scanned blind hole can be determined when scanning and detecting blind holes. This allows for high measurement accuracy when comparing the blind holes of the current PCB board with standard blind holes. At the same time, by adjusting the perpendicularity of the linear scanning camera, it is ensured that the linear scanning camera can scan the bottom of the blind hole, avoiding the problem of inaccurate depth measurement of blind holes caused by the linear scanning camera only scanning the inner wall of the blind hole due to angular deviation.

Claims

1. A method for installing and adjusting a detection mechanism for PCB blind via inspection, comprising the following steps: (1) The linear scan camera is pre-fixed on the inspection frame using the adjustment device; (2) A line board is installed below the testing mechanism; (3) The line scan 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 line scan image on the preset line board and the line on the actual line board is obtained, and the horizontal offset angle of the line scan camera is determined based on the angle. (5) Determine the vertical offset angle of the line scan camera by the position of the emission point of the line scan camera on the plane below the detection mechanism and the angle between the line scan camera and the axis of the line scan camera. (6) Adjust the line scan camera using the adjustment device according to the horizontal offset angle and the vertical angle of the line scan camera; The testing mechanism includes a testing frame, an adjustment device, and a linear scan camera, wherein the linear scan camera is mounted on the testing frame via the adjustment device. The adjustment device includes a first adjustment component and a second adjustment component. The first adjustment component is mounted on the inspection frame, and the second adjustment component is mounted on the first adjustment component. The line scan camera is mounted on the second adjustment component. The first adjustment component is used to adjust the verticality of the second adjustment component, and the second adjustment component is used to adjust the parallelism of the scan lines of the line scan camera. Its features are: The first adjustment assembly 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 mounted on the testing frame. The center of the first adjustment mounting plate has a mounting hole corresponding to the first adjustment mounting shaft. The first adjustment mounting plate is mounted on the first adjustment mounting shaft. The first adjustment plate is mounted on the testing frame on one side of the first adjustment mounting plate. The first adjustment plate has a first adjustment groove. The first adjustment block is located in the first adjustment groove on one side of the first adjustment mounting plate. The first adjustment screw and the second adjustment screw are respectively mounted on the first adjustment plates on both sides of the first adjustment block. The first adjustment plate has a threaded hole. 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 perpendicularity of the first adjustment component to the horizontal plane of the worktable; S11 Installs the first adjustment mounting plate on the first adjustment mounting shaft; S12 rotates the first adjusting screw and the second adjusting screw, so that the first adjusting screw and the second adjusting screw move closer to each other and clamp the first adjusting block, thereby fixing the first adjusting mounting plate; S13 rotates the first and second adjusting screws in the opposite direction according to the vertical angle of the linear scan camera, so that the first adjusting mounting plate is perpendicular to the horizontal plane of the worktable.

2. The installation and adjustment method of the detection mechanism for PCB blind via detection according to claim 1, characterized in that: The testing mechanism also includes a light source module, with a through slot in the center of the light source module. The scanning end of the linear scan camera is located above the through slot, and light sources are located on both sides of the through slot.

3. The installation and adjustment method of the detection mechanism for PCB blind via detection according to claim 1, characterized in that: 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. The second adjustment connecting plate has a through hole at its center. The second adjustment mounting plate is located at the top of the first adjustment connecting plate. The linear scan 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 plates 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 are close to each other and abut against both sides of the second adjustment block. Step (6) includes: S2 adjusts the parallelism between the scan lines of the linear scan camera and the front face of the worktable. S23 adjusts the third and fourth adjusting screws to cause the second adjusting mounting plate to rotate in the opposite direction to the horizontal offset angle of the linear scan camera, so that the third and fourth adjusting screws move closer to each other and clamp the second adjusting block, thereby fixing the second adjusting mounting plate.

4. The installation and adjustment method of the detection mechanism for PCB blind via detection according to claim 1, characterized in that: Step (5) includes: (51) determining the emission point of the linear scanning camera axis direction in the detection plane, and then determining the position of the emission point of the linear scanning camera on the plane below the detection mechanism; (52) comparing the emission point of the linear scanning camera axis direction with the position of the emission point of the linear scanning camera 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 scanning camera based on the preset distance between the center of the linear scanning camera and the plane.

Images