PCB ink height detection and repair equipment

Abstract

The present application relates to PCB ink height detection and repair technical field, specifically to a kind of PCB ink height detection and repair equipment, including equipment table body and transfer mechanism, the surface of the equipment table body is equipped with the transfer mechanism for moving PCB board, and transfer mechanism is by adsorption platform, screw rod, servo motor and linear guide rail composition;The servo motor is installed on the surface of equipment table body, and the output end of servo motor is fixed with screw rod by coupling, the top of the transfer mechanism is provided with image acquisition mechanism and laser repair ink height mechanism, and image acquisition mechanism and laser repair ink height mechanism are installed on the surface of equipment table body.The present application is equipped with the transfer mechanism, image acquisition mechanism and laser repair ink height mechanism, can improve the detection and repair efficiency of PCB board ink height, reduce labor intensity;Meanwhile, compared with artificial naked eye identification, its detection process is reliable, and the degree of automation is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PCB ink height detection and repair, in particular to a PCB ink height detection and repair device. BACKGROUND

[0002] At present, in order to ensure the size of the PCB ink height, the manufacturers generally adopt the manual naked eye identification method, which consumes a large amount of labor and has a low accuracy, and some defects in the production process are difficult to be observed by naked eyes, which is prone to missed detection and misdiagnosis, the detection work is unreliable, and the repair work takes a long time. With the increase of production, the efficiency of manual detection is difficult to improve, and the detection standards of each person are difficult to be consistent, which reduces the automation degree and efficiency of production, and therefore a PCB ink height detection and repair device is needed. SUMMARY

[0003] The purpose of the present application is to provide a PCB ink height detection and repair device to solve the problems of missed detection and misdiagnosis, unreliable detection work, and long repair work time in the background art.

[0004] To achieve the above purpose, the present application provides the following technical scheme: a PCB ink height detection and repair device, comprising a device table body and a transfer mechanism, a transfer mechanism for transferring PCB boards is installed on the surface of the device table body, and the transfer mechanism is composed of an adsorption platform, a lead screw, a servo motor and a linear guide rail; the servo motor is installed on the surface of the device table body, and the output end of the servo motor is fixed with the lead screw through a shaft coupling, and the other end of the lead screw is rotatably connected with the surface of the device table body, an image acquisition mechanism and a laser repair ink height mechanism are arranged above the transfer mechanism, and the image acquisition mechanism and the laser repair ink height mechanism are installed on the surface of the device table body, and the center lines of the image acquisition mechanism and the laser repair ink height mechanism coincide with the center line of the transfer mechanism.

[0005] Preferably, the lead screw is provided with a linear guide rail on both sides, and the linear guide rail is installed on the surface of the device table body, and the surface of the linear guide rail is slidably connected with the adsorption platform, and the adsorption platform is threadedly connected with the lead screw.

[0006] Preferably, the image acquisition mechanism is composed of a pattern acquisition device, a mounting plate, a sliding plate, a first linear motor and a fixed frame, the fixed frame is installed on the surface of the device table body, and the surface of the fixed frame is fixed with the first linear motor.

[0007] Preferably, the surface of the first linear motor is fixed with the sliding plate, the bottom end of the sliding plate is welded with the mounting plate, and the bottom end of the mounting plate is installed with the pattern acquisition device.

[0008] Preferably, the laser repair ink height mechanism is composed of a laser head, a fixed plate, a second linear motor and a support frame, the support frame is installed on the surface of the equipment table body, and the surface of the support frame is installed with the second linear motor.

[0009] Preferably, the output end of the second linear motor is fixed with the fixed plate, and the surface of the fixed plate is installed with the laser head.

[0010] Preferably, the image acquisition device adopts the following image processing method:

[0011] S1, the convex point part is preliminarily separated through dynamic threshold segmentation, then the Lagrange median theorem is used for filtering processing, and then Fourier transform is used for further feature extraction of the separated convex point, so as to screen out the problem convex point from the image;

[0012] S2, the area within 3mm around each convex point is fitted with a plane by using the least square method, so that the reference surface of the surrounding area is on the same plane as the convex point area;

[0013] S3, the actual height of each pixel point in the top 20% of the screened convex points is calculated;

[0014] S4, the average value of the actual height of the top 20% of the pixel points is calculated as the height value of the convex point area;

[0015] S5, whether the convex point is an NG point is judged by comparing the height value of the convex point area with the standard value of the height specified by the customer;

[0016] S6, the height value and coordinate position of the NG convex point are sent to the PLC.

[0017] Preferably, the laser head releases the corresponding energy value through the calculated height value of the NG convex point, and burns the part of the convex point through the emitted laser, so that the height value after repair reaches the standard value or below.

[0018] Compared with the prior art, the PCB ink height detection and repair equipment can improve the detection and repair efficiency of the PCB ink height, and reduce the labor intensity through the setting of the transfer mechanism, the image acquisition mechanism and the laser repair ink height mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a three-dimensional appearance structure schematic diagram of the present application;

[0020] Figure 2 It is a transfer mechanism structure schematic diagram of the present application;

[0021] Figure 3 It is a schematic structural view of the image acquisition mechanism of the application.

[0022] Figure 4 It is a schematic structural view of the laser repair ink height mechanism of the application.

[0023] In the figure: 1, equipment table body; 2, transfer mechanism; 21, adsorption platform; 22, screw rod; 23, servo motor; 24, linear guide rail; 3, image acquisition mechanism; 31, image collector; 32, mounting plate; 33, sliding plate; 34, first linear motor; 35, fixed frame; 4, laser repair ink height mechanism; 41, laser head; 42, fixed plate; 43, second linear motor; 44, support frame. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. In addition, the terms "first", "second", "third", "upper", "lower", "left", "right" and the like are only used for description purposes, and cannot be understood as indicating or implying relative importance. Meanwhile, in the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0025] The structure of the PCB ink height detection and repair equipment provided by the application is shown in Figure 1 and Figure 2 The surface of the equipment table body 1 is provided with a transfer mechanism 2 for transferring the PCB board, and the transfer mechanism 2 is composed of an adsorption platform 21, a screw rod 22, a servo motor 23 and a linear guide rail 24. The linear guide rails 24 are arranged on both sides of the screw rod 22, and the linear guide rails 24 are installed on the surface of the equipment table body 1. The surface of the linear guide rail 24 is slidably connected with the adsorption platform 21, and the adsorption platform 21 is threadedly connected with the screw rod 22. The servo motor 23 is installed on the surface of the equipment table body 1, and the output end of the servo motor 23 is fixed with the screw rod 22 through a shaft coupling, and the other end of the screw rod 22 is rotatably connected with the surface of the equipment table body 1.

[0026] In the implementation, the servo motor 23 drives the screw rod 22 to rotate, and the screw rod 22 rotates to threadedly cooperate with the adsorption platform 21, so that the adsorption platform 21 moves along the linear guide rail 24.

[0027] Further, as shown in Figure 3 The image acquisition mechanism 3 and the laser ink height repair mechanism 4 are arranged above the transfer mechanism 2, and the image acquisition mechanism 3 and the laser ink height repair mechanism 4 are installed on the surface of the equipment table body 1. The image acquisition mechanism 3 is composed of a pattern collector 31, a mounting plate 32, a sliding plate 33, a first linear motor 34, and a fixed frame 35. The fixed frame 35 is installed on the surface of the equipment table body 1, and the surface of the fixed frame 35 is fixed with the first linear motor 34. The surface of the first linear motor 34 is fixed with the sliding plate 33. The bottom end of the sliding plate 33 is welded with the mounting plate 32, and the bottom end of the mounting plate 32 is installed with the pattern collector 31.

[0028] In implementation, the servo motor 23 drives the screw rod 22 to rotate. When the screw rod 22 rotates, it is threadedly matched with the adsorption platform 21, so that the adsorption platform 21 moves along the linear guide rail 24.

[0029] Further, as shown in Figure 4 The laser ink height repair mechanism 4 is composed of a laser head 41, a fixed plate 42, a second linear motor 43, and a support frame 44. The support frame 44 is installed on the surface of the equipment table body 1, and the surface of the support frame 44 is installed with the second linear motor 43. The output end of the second linear motor 43 is fixed with the fixed plate 42, and the surface of the fixed plate 42 is installed with the laser head 41. At the same time, the center lines of the image acquisition mechanism 3 and the laser ink height repair mechanism 4 coincide with the center line of the transfer mechanism 2.

[0030] In implementation, the support frame 44 drives the fixed plate 42 to move, so that the fixed plate 42 drives the laser head 41 to move. The laser head 41 repairs the ink height.

[0031] Working principle: when in use, the PCB board is placed on the surface of the adsorption platform 21. The PCB board is moved to the position below the image acquisition mechanism 3 by the transfer mechanism 2. In implementation, the servo motor 23 drives the screw rod 22 to rotate. When the screw rod 22 rotates, it is threadedly matched with the adsorption platform 21, so that the adsorption platform 21 moves along the linear guide rail 24.

[0032] When the adsorption platform 21 drives the PCB board to move to the position of the image acquisition mechanism 3, the image acquisition mechanism 3 acquires the image. In implementation, the first linear motor 34 drives the sliding plate 33 to move. When the sliding plate 33 moves, it drives the pattern collector 31 on the surface of the mounting plate 32 to move transversely, so as to acquire the PCB board on the surface of the adsorption platform 21. The acquired image information is sent to the image processing device for analysis and judgment. The area greater than the set value is calculated. The image acquisition is completed and uploaded to the computer for image calculation and processing. The processed data is fed back to the PLC.

[0033] In this embodiment, the image processing method of the image collector includes the following steps:

[0034] S1, through dynamic threshold segmentation, by setting a threshold value and the pixel gray value, the gray value of the collected image f(x, y) is higher than that of other elements in the background, and a threshold value T is set. When the gray value of the pixel is greater than the set value, the point is regarded as a convex point, otherwise it is regarded as a normal image point. At this time, the segmented image g(x, y) can be determined by the following formula, that is:

[0035]

[0036] The value range of coordinates (x, y) is all points in the image f(x, y).

[0037] The convex part is preliminarily separated, and then filtered and processed by using Lagrange mean value theorem. If the function f(x) is derivable on (a, b) and continuous on [a, b], then there is ξ∈[a,b] such that

[0038] f'(ξ)*(b-a)=f(b)-f(a);

[0039] f(x) is y, and the formula is △y=f'(x+θ△x)*△x (0<θ<1);

[0040] Then, Fourier transform is used to convert time domain to frequency domain, representing the degree of gray scale change in the image. The image is filtered and enhanced by using the processing method of frequency domain signal in signal processing. Then, the frequency distribution function is converted to the gray scale distribution function by converting the frequency domain to the time domain, and the separated convex is further characterized to screen out the problem convex from the image;

[0041] S2, the area within 3mm around each convex is fitted with a plane by using least square method, so that the reference surface of the surrounding area of the convex area is on the same plane;

[0042] S3, the actual height of each pixel point in the top 20% of the height of the selected convex is calculated;

[0043] S4, the average value of the actual height of the top 20% of the pixel points is calculated as the height value of the convex region;

[0044] S5, whether the convex is an NG point is judged by comparing the height value of the convex region with the standard value of the height specified by the customer;

[0045] S6, the height value and coordinate position of the NG convex are sent to PLC.

[0046] If laser repair is needed, the PCB is placed on the surface of the adsorption platform 21, the PCB is moved to the position of the laser repair ink height mechanism 4 by the transfer mechanism 2 to repair the ink height, when the laser repair ink height mechanism 4 is implemented, the fixed plate 42 is moved by the support frame 44, so that the fixed plate 42 drives the laser head 41 to move, the laser head 41 releases the corresponding energy value through the calculated height value of the NG bump, and the part of the bump is burned by the emitted laser, so that the height value after repair reaches the standard value and below.

[0047] After repair, the adsorption platform 21 retreats to perform the next cycle action, which can improve the detection and repair efficiency of the ink height of the PCB, and reduce the labor intensity. Compared with manual visual identification, the detection process of the device is reliable and has high automation degree, and finally the use work of the detection and repair device is completed.

[0048] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than by the foregoing description, and it is intended that all changes which come within the meaning and range of equivalency of the claims are embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A PCB ink height detection and repair device, comprising a device table body (1) and a transfer mechanism (2), characterized in that: The surface of the equipment table body (1) is provided with a transfer mechanism (2) for transferring the PCB, and the transfer mechanism (2) is composed of an adsorption platform (21), a screw rod (22), a servo motor (23) and a linear guide rail (24); the servo motor (23) is installed on the surface of the equipment table body (1), and the output end of the servo motor (23) is fixed with the screw rod (22) through a shaft coupling, and the other end of the screw rod (22) is rotatably connected with the surface of the equipment table body (1); an image acquisition mechanism (3) and a laser repair ink height mechanism (4) are arranged above the transfer mechanism (2), and the image acquisition mechanism (3) and the laser repair ink height mechanism (4) are installed on the surface of the equipment table body (1), and the center lines of the image acquisition mechanism (3) and the laser repair ink height mechanism (4) coincide with the center line of the transfer mechanism (2); the image acquisition mechanism (3) is composed of a pattern collector (31), a mounting plate (32), a sliding plate (33), a first linear motor (34) and a fixing frame (35); the image processing method of the pattern collector (31) comprises the following steps: S1, through dynamic threshold segmentation, by comparing the set threshold value with the pixel gray value, the gray value of the convex point in the image f(x, y) is higher than that of other elements in the background, a threshold value T is set, when the gray value of the pixel is greater than the set value, the point is regarded as a convex point, otherwise it is regarded as a normal image point, at this time, the segmented image g(x, y) can be determined by the following formula, that is: ； The value range of coordinates (x, y) is all points in the image f(x, y); The convex point part is preliminarily separated out, and then filtered and processed by using Lagrange mean value theorem, if a function f(x) is derivable on (a, b) and continuous on [a, b], then there is ξ∈[a, b] such that f'(ξ)*(b-a)=f(b)-f(a); f(x) is y, and the formula is△y=f'(x+θ△x)*△x (0<θ<1); Then Fourier transform is used to convert time domain to frequency domain, the image is filtered and enhanced by using the processing method of the frequency domain signal in signal processing, and then the frequency distribution function is converted into the gray distribution function, and the separated convex is further characterized to screen out the problem convex point from the image; S2, the area within 3mm around each convex point is fitted with a plane by using least square method, so that the reference surface of the area around the convex point is on the same plane; S3, the actual height of each pixel point in the top 20% of the selected convex points is calculated; S4, the average value of the actual height of the top 20% of the pixel points is taken as the height value of the convex region; S5, whether the convex point is an NG point is judged by comparing the height value of the convex region with the standard value of the height specified by the customer; S6, the height value and coordinate position of the NG convex point are sent to the PLC.

2. The PCB ink height detection and repair device of claim 1, wherein: The linear guide rail (24) is arranged on both sides of the lead screw (22) and is installed on the surface of the equipment table body (1), the surface of the linear guide rail (24) is slidably connected with the adsorption platform (21), and the adsorption platform (21) is threadedly connected with the lead screw (22).

3. The PCB ink height detection and repair apparatus of claim 1, wherein: The fixed frame (35) is installed on the surface of the equipment table body (1), and the surface of the fixed frame (35) is fixedly connected with the first linear motor (34).

4. The PCB ink height detection and repair apparatus of claim 3, wherein: The surface of the first linear motor (34) is fixedly connected with the sliding plate (33), the bottom end of the sliding plate (33) is welded with the mounting plate (32), and the bottom end of the mounting plate (32) is installed with the pattern collector (31).

5. The PCB ink height detection and repair apparatus of claim 1, wherein: The laser repair ink height mechanism (4) is composed of a laser head (41), a fixed plate (42), a second linear motor (43) and a support frame (44), the support frame (44) is installed on the surface of the equipment table body (1), and the surface of the support frame (44) is installed with the second linear motor (43).

6. The PCB ink height detection and repair apparatus of claim 5, wherein: The output end of the second linear motor (43) is fixedly connected with the fixed plate (42), and the surface of the fixed plate (42) is installed with the laser head (41).

7. The PCB ink height detection and repair apparatus of claim 1, wherein: The laser head releases the corresponding energy value through the calculated height value of the NG convex point, burns the part of the convex point through the emitted laser, and makes the height value after repair reach the standard value or below.

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