WO2020215820A1

WO2020215820A1 - Multifunctional automatic detection device for coating quality of pcb

Info

Publication number: WO2020215820A1
Application number: PCT/CN2020/070637
Authority: WO
Inventors: 詹登星; 张攀武; 郑逢兵; 蔡溢昌
Original assignee: 东莞市安达自动化设备有限公司
Priority date: 2019-04-23
Filing date: 2020-01-07
Publication date: 2020-10-29
Also published as: CN110412051A; CN210198260U

Abstract

A multifunctional automatic detection device for the coating quality of a PCB, comprising a machine frame (10). A conveying channel (11) used for conveying a product to be detected that is coated with a film is provided on the machine frame (10). A film thickness detection assembly (20) and a detection Z-axis driving assembly (13) that drives the film thickness detection assembly (20) to press on the surface of the product to be detected are provided above the conveying channel (11). The film thickness detection assembly (20) comprises a pressure plate (25). The lower end of the pressure plate (25) is provided with two reference blocks (251) spaced apart from each other and extending downwards. Lower surfaces of the two reference blocks (251) are on the same horizontal plane. Detection blocks (261) that have different lengths are provided between the two reference blocks (251), and lower surfaces of the detection blocks (261) are both higher than the lower surfaces of the reference blocks (251). A CCD camera (15) used for taking pictures of the detection blocks (261) is provided below the conveying channel (11). The present automatic detection device performs online detects the coating film quality of the PCB, does not need to separately extract the product for detection, avoids the cumbersome, untimely and high error performance of existing manual detection operations, and implements automatic detection.

Description

Multifunctional automatic detection equipment for PCB coating quality

Technical field

The invention relates to the technical field of coating film thickness detection equipment, in particular to a multifunctional automatic detection equipment for PCB coating quality.

Background technique

PCB circuit boards can realize automatic insertion or placement of electronic components and automatic soldering to ensure the quality of electronic equipment. Therefore, they are used in circuit automation, computers, electrical appliances and other fields, and are widely used in life, scientific and technological production and other aspects. The surface treatment process of the PCB circuit board directly affects its quality in practical applications. The prior art usually coats the surface of the PCB circuit board with a protective film, that is, three-proof paint to protect the surface of the PCB board. The thickness of the PCB directly affects the quality of the PCB. It is usually necessary to detect the thickness of the coating, whether there is missing coating, overcoating, splashing, etc. The current coating inspection method is to manually extract the product after the coating work is completed, and use the human eye to inspect it, which cannot reflect the actual spraying quality, which is not conducive to online operations and delays the production progress of the entire line.

Summary of the invention

Aiming at the deficiencies in the prior art, the present invention provides a multifunctional automatic detection device for PCB coating quality, which can detect the coating thickness of the PCB board online, without the need to extract the product separately for detection, and solve the existing manual manual The cumbersome and non-timeliness of the inspection operation makes the whole line production obtain higher continuity, improves the whole line production efficiency, and improves the accuracy of the inspection.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

A multifunctional automatic detection equipment for the coating quality of a PCB board includes a frame on which a conveying channel for conveying the finished product to be tested is provided with a film thickness detection assembly and A detection Z-axis drive component that drives the film thickness detection component to press on the surface of the product to be tested. The film thickness detection component includes a pressure plate. The lower end of the pressure plate is provided with two reference blocks extending downward at a distance. The lower surface of the reference block is on the same horizontal plane, a detection block of different lengths is arranged between the two reference blocks, and the lower surface of the detection block is higher than the lower surface of the reference block, and the bottom of the conveying channel A CCD camera for taking pictures of the detection block is provided, and a camera Z-axis drive assembly for driving the CCD camera to move up and down is provided on the frame under the conveying channel, and a camera Y-axis drive assembly for driving the camera Z-axis drive assembly to move left and right. And the camera X-axis drive assembly that drives the camera's Y-axis drive assembly to move back and forth.

As a preferred solution, the film thickness detection assembly further includes a detection board, the detection block is arranged at the lower end of the detection board, a mounting groove is provided between the two reference blocks of the pressure plate, and the detection board passes The bolts or screws are detachably installed in the installation slot, so that the detection boards with different extension lengths can be replaced according to the different coating thickness requirements of different products, and the flexibility of the use of the equipment is improved.

As a preferred solution, the film thickness detection assembly further includes a spring cylinder and a cylinder mounting plate, the film thickness detection assembly is connected to the detection Z-axis drive assembly through the cylinder mounting plate, and the spring cylinder is fixedly mounted on the cylinder mounting plate At the upper end of the outer surface, the piston rod of the spring cylinder protrudes downwards and is fixedly connected to the pressure plate, and the spring cylinder is provided with a return spring that makes the piston rod always protrude outward. By using a spring cylinder, the pressure plate has a certain buffer capacity during testing, and avoids the pressure block from causing excessive damage to the PCB board.

As a preferred solution, the lower end of the outer surface of the cylinder mounting plate is provided with a guide member, and the guide member is provided with a guide hole through which the pressure plate can pass. During assembly, the pressure plate extends downward through the guide hole. Therefore, the deflection of the pressure plate is avoided when the pressure plate is moving, and the detection accuracy is improved.

As a preferred solution, a ring light source is provided above the CCD camera.

As a preferred solution, the frame is also provided with a detection Y-axis drive assembly that drives and detects the left and right movement of the Z-axis drive assembly, and a detection X-axis drive assembly that drives and detects the front and back movement of the Y-axis drive assembly.

As a preferred solution, it also includes a PLC controller, which is respectively associated with the detection X-axis drive assembly, the detection Y-axis drive assembly, the detection Z-axis drive assembly, the CCD camera, the camera X-axis drive assembly, and the camera Y-axis drive. The components, the camera Z-axis drive component and the spring cylinder are connected.

As a preferred solution, the two sides of the conveying channel are provided with pressing components for fixing the products to be tested, and the pressing components include a pressing cylinder fixedly installed on the outside of the conveying channel and a pressing cylinder that is controlled to move up and down. A pressing plate, one end of the pressing plate extends toward the inner side of the conveying channel.

As a preferred solution, a stopper assembly is provided on the conveying channel to stop the product to be tested at the test position, and the stopper assembly includes a stopper cylinder fixedly installed under the conveying channel and the stopper cylinder controls the up and down movement The baffle plate.

As a preferred solution, the outer side of the conveying channel is provided with a wiping assembly for wiping off the paint on the detection block, the wiping assembly is arranged on one side of the CCD camera, and the wiping assembly includes a wiping belt and a driving wiping belt Mobile wiper motor.

The working process of the present invention is as follows:

When it is necessary to check whether the coating thickness of the PCB board surface coating is qualified, transport the newly coated PCB board to the test position through the conveying channel. After the product to be tested reaches the test position, the stopper cylinder drives the stopper to move upward to block For the product to be tested, the compression cylinder drives the pressing plate to compress the product to be tested. The film thickness detection component moves to the top of the product to be tested, and is driven by the detection Z-axis drive component to move down, so that the reference block on the pressure plate is compacted The surface of the product to be tested, then the film thickness detection component is moved above the CCD camera, and the detection block at the lower end of the pressure plate is photographed by the CCD camera to determine whether there is a coating film on the detection block, thereby determining the thickness of the coating film After the test is completed, wipe the paint on the test block by wiping the assembly for the next test. There are two detection blocks in the present invention, one is used to detect the lowest value of film thickness, and the other is used to detect the highest value of film thickness. When the two detection blocks have no coating film attached, it indicates that the film thickness is lower than the minimum value. When the test block used to detect the lowest value of the film thickness is stuck with the coating film, and the other is not stuck with the coating film, it indicates that the thickness of the coating film is between the minimum value and the maximum value, and when the two detection blocks are both adhered to the coating film Indicates that the thickness of the coating film is greater than the maximum value.

When it is necessary to check whether the PCB surface coating has quality problems such as over-coating, missing coating, splashing, etc., the newly-coated PCB board is transported to the test position through the conveying channel. After the product to be tested reaches the test position, the stopper cylinder is driven The baffle plate moves upward to block the product to be tested. The CCD camera is driven by the camera X-axis drive assembly, the camera Y-axis drive assembly and the camera Z-axis drive assembly to take pictures of the coated area on the PCB board, and compare the photographed results with Compare the photos of PCB boards with standard coating effects stored in the PLC controller or external computer in advance to obtain the test results.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, the film thickness detection assembly is directly arranged above the conveying channel, and the CCD camera is arranged below the conveying channel, so that the film thickness detection assembly can be treated After the product is tested, the film thickness detection component is photographed and observed by a CCD camera to obtain the film thickness test result, thereby realizing the online detection of the coating film thickness of the PCB board. There is no need to extract the product separately for testing. It has the cumbersome, untimely and high error of manual detection operation, which realizes automatic detection of coating film thickness, so that the whole line production can obtain higher continuity, improve the whole line production efficiency, and improve the accuracy of detection; Set up the camera X-axis drive component, camera Y-axis drive component and camera Z-axis drive component to realize the movement of the X-axis, Y-axis and Z-axis of the CCD camera, so that the CCD camera can take pictures and observe the film thickness detection component In addition, the surface of the entire PCB board can be photographed and observed in different areas. By digitizing the photographing results and comparing them with standard coated PCB boards, the coating quality inspection results can be obtained, which is simple, convenient and efficient. high.

In order to more clearly illustrate the structural features, technical means, and specific objectives and functions achieved by the present invention, the following further describes the present invention in detail with reference to the drawings and specific embodiments:

Description of the drawings

Figure 1 is an assembly structure diagram of an embodiment of the present invention;

Fig. 2 is an enlarged schematic diagram of A in Fig. 1;

Fig. 3 is a front view of a film thickness detection assembly according to an embodiment of the present invention;

Figure 4 is a schematic cross-sectional view at B-B in Figure 3;

Figure 5 is an exploded schematic view of the film thickness detection component of the embodiment of the present invention;

Figure 6 is another view of the assembly structure of the embodiment of the present invention;

Fig. 7 is an enlarged schematic view of C in Fig. 6.

Description of the drawing identification:

10. Rack 11. Conveying channel 12. Detect X-axis drive components

13. Detect Z-axis drive components 14. Detect Y-axis drive components

15. CCD camera 151. Camera Z-axis drive assembly

152. Camera Y-axis drive assembly 153. Camera X-axis drive assembly

154. Ring light source 16. Compression cylinder 17. Press plate

20. Film thickness detection assembly 21. Cylinder mounting plate 22. Spring cylinder

23. Return spring 24. Piston rod 25. Pressure plate

251. Reference block 252. Installation slot 26. Detection board

261. Detection block 27. Guide piece 271. Guide hole

30. Wipe tape 31. Control motor

Detailed ways

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated position or positional relationship is based on the position or positional relationship shown in the drawings, and is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the pointed position or element must have a specific orientation and be constructed in a specific orientation And operation, therefore cannot be understood as a limitation of the present invention.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise clearly specified and limited. For example, they can be fixed or detachable. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present invention can be understood according to specific circumstances.

As shown in Figure 1-7, a multifunctional automatic detection device for the coating quality of PCB boards includes a PLC controller and a frame 10. The frame 10 is provided with a conveying channel for conveying the finished product to be tested. 11. Above the conveying channel 11 is provided with a film thickness detection component 20 and a detection Z-axis drive component 13 that drives the film thickness detection component 20 to press on the surface of the product to be tested. The frame 10 is also provided with a drive detection Z-axis The Y-axis driving assembly 14 for detecting the left and right movement of the driving assembly 13 and the X-axis driving assembly 12 for detecting the front and back movement of the Y-axis driving assembly 14 are driven. The film thickness detection assembly 20 includes a pressing plate 25. The lower end of the pressing plate 25 is provided with two reference blocks 251 extending downward at a distance. The lower surfaces of the two reference blocks 251 are on the same horizontal plane. Between the reference blocks 251 is provided a detection block 261 of different lengths, and the lower surface of the detection block 261 is higher than the lower surface of the reference block 251. Below the conveying channel 11 is provided for performing inspection on the detection block 261. The CCD camera 15 for taking pictures has a ring light source 154 above the CCD camera. The frame 10 below the conveying channel 11 is provided with a camera Z-axis drive assembly 151 for driving the CCD camera 15 to move up and down, a camera Y-axis drive assembly 152 for driving the camera Z-axis drive assembly 151 to move left and right, and a camera Y-axis drive. The camera X-axis drive assembly 153 moves the assembly 152 back and forth. Both sides of the conveying channel 11 are provided with pressing components for fixing the product to be tested. The pressing component includes a pressing cylinder 16 fixedly installed outside the conveying channel 11 and a pressing material controlled by the pressing cylinder 16 to move up and down. A plate 17, one end of the pressing plate 17 extends toward the inner side of the conveying channel 11. The conveying channel 11 is provided with a stopper assembly for stopping the product to be tested at the test position, and the stopper assembly includes a stopper cylinder fixedly installed under the conveying channel 11 and a stopper plate controlled by the stopper cylinder to move up and down . The outer side of the conveying channel 11 is provided with a wiping assembly for wiping off the paint on the detection block 261. The wiping assembly includes a wiping belt 30 and a wiping motor 31 that drives the wiping belt 30 to move.

As shown in Figures 2-5, the film thickness detection assembly 20 further includes a spring cylinder 22 and a cylinder mounting plate 21. The film thickness detection assembly 20 is connected to the detection Z-axis drive assembly 13 through the cylinder mounting plate 21. The spring cylinder 22 is fixedly installed on the upper end of the outer surface of the cylinder mounting plate 21. The piston rod 24 of the spring cylinder 22 extends downwards and is fixedly connected to the pressure plate 25. The spring cylinder 22 is provided with the piston rod 24 always having a direction A return spring 23 with a tendency to extend outward. By using the spring cylinder 22, the pressure plate 25 has a certain buffer capacity during testing, and avoids the pressure block from causing excessive damage to the PCB board.

The lower end of the outer surface of the cylinder mounting plate 21 is provided with a guide member 27. The guide member 27 is provided with a guide hole 271 through which the pressure plate 25 can pass. During assembly, the pressure plate 25 extends downward through the guide hole 271 , Thereby avoiding the deflection when the pressing plate 25 moves, and improving the accuracy of detection.

The film thickness detection assembly 20 further includes a detection plate 26. The detection block 261 is arranged at the lower end of the detection plate 26. A mounting groove 252 is provided between the two reference blocks 251 of the pressing plate 25. The detection plate 26 is detachably installed in the mounting groove 252 by bolts or screws, so that the detection board 26 of the detection block 261 with different extension lengths can be replaced according to the different coating thickness requirements of different products, which improves the flexibility of the use of the equipment. There are two detection blocks 261, and the two detection blocks 261 respectively correspond to the minimum coating thickness and the maximum coating thickness. During detection, when the two detection blocks 261 are not stuck to the coating film, it indicates the thickness of the coating film Less than the minimum coating thickness, the coating result is unqualified; when only the detection block 261 that detects the minimum coating thickness is stuck to the coating film, it indicates that the coating film thickness is between the minimum coating thickness and the maximum coating thickness, and the coating result is qualified ; When both detection blocks are stuck to the coating film, it indicates that the thickness of the coating film is greater than the maximum coating thickness, and the coating result is unqualified.

In the present invention, the PLC controller is respectively connected with the detection X-axis drive assembly 12, the detection Y-axis drive assembly 14, the detection Z-axis drive assembly 13, the CCD camera 15, the camera X-axis drive assembly 153, the camera Y-axis drive assembly 152, The camera Z-axis drive assembly 151 is connected to the spring cylinder 22. In the present invention, the detection X-axis drive assembly 12, the detection Y-axis drive assembly 14, the detection Z-axis drive assembly 13, the camera X-axis drive assembly 153, the camera Y-axis drive assembly 152, and the camera Z-axis drive assembly 151 all include: Guide rail, servo motor, and lead screw driven by the servo motor.

The working process of the present invention is as follows:

When it is necessary to check whether the coating thickness of the PCB board surface coating is qualified, the newly coated PCB board is transported to the test position through the conveying channel 11. After the product to be tested reaches the test position, the stopper cylinder drives the stopper to move upward Block the product to be tested, the compression cylinder 16 drives the pressing plate 17 to compress the product to be tested, the film thickness detection assembly 20 moves to the top of the product to be tested, and is driven by the detection Z-axis drive assembly 13 to move downward, so that the pressing plate 25 The reference block 251 is compacted on the surface of the product to be tested, and then the film thickness detection assembly 20 is moved above the CCD camera 15, and the detection block 261 at the lower end of the pressing plate 25 is photographed by the CCD camera 15 to determine whether the detection block 261 is on The coating film is attached, so that the thickness of the coating film can be determined;

When it is necessary to check whether the PCB surface coating has quality problems such as over-coating, missing coating, splashing, etc., transport the newly-coated PCB board to the test position through the conveying channel 11. After the product to be tested reaches the test position, the stopper cylinder Drive the baffle upward to block the product to be tested. The CCD camera 15 is driven by the camera X-axis drive assembly 153, the camera Y-axis drive assembly 152, and the camera Z-axis drive assembly 151 to take pictures of the coating area on the PCB. Digitally compare the photo results with the photos of PCB boards with standard coating effects stored in the PLC controller or external computer in advance to obtain the test results.

The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Therefore, any modification, equivalent replacement, improvement, etc. actually made to the above embodiments based on the technology of the present invention still belong to the present invention. Within the scope of technical solutions.

Claims

A multifunctional automatic detection equipment for the coating quality of a PCB board, which is characterized in that it comprises a frame, on which is provided a conveying channel for conveying the finished product to be tested, and a film is arranged above the conveying channel. A thickness detection component and a detection Z-axis drive component that drives the film thickness detection component to press on the surface of the product to be tested, the film thickness detection component includes a pressing plate, and two reference blocks extending downward at a distance are provided at the lower end of the pressing plate , The lower surfaces of the two reference blocks are on the same horizontal plane, a detection block of different lengths is arranged between the two reference blocks, and the lower surface of the detection block is higher than the lower surface of the reference block. A CCD camera for taking pictures of the detection block is provided under the conveying channel, and a camera Z-axis drive assembly for driving the CCD camera to move up and down is provided on the frame under the conveying channel, and a camera for driving the camera Z-axis drive assembly to move left and right. A Y-axis drive assembly and a camera X-axis drive assembly that drives the camera Y-axis drive assembly to move back and forth.
The PCB board coating quality multifunctional automatic detection equipment according to claim 1, wherein the film thickness detection assembly further comprises a detection board, the detection block is provided at the lower end of the detection board, and the pressure plate An installation groove is arranged between the two reference blocks, and the detection board is detachably installed in the installation groove by bolts or screws.
The multifunctional automatic detection equipment for the coating quality of the PCB board according to claim 1 or 2, wherein the film thickness detection assembly further includes a spring cylinder and a cylinder mounting plate, and the film thickness detection assembly passes through the cylinder mounting plate. Connected to the detection Z-axis drive assembly, the spring cylinder is fixedly installed on the upper end of the outer surface of the cylinder mounting plate, the piston rod of the spring cylinder extends downwards and is fixedly connected to the pressure plate, and the spring cylinder is provided with a piston rod A return spring that always has a tendency to extend outward.
The PCB board coating quality multifunctional automatic detection equipment according to claim 3, characterized in that: the lower end of the outer surface of the cylinder mounting plate is provided with a guide, and the guide is provided with a guide through which the pressing plate can pass hole.
The multifunctional automatic detection equipment for PCB coating quality according to claim 1 or 2, characterized in that: a ring light source is arranged above the CCD camera.
The PCB board coating quality multifunctional automatic detection equipment according to claim 3, characterized in that: the frame is also provided with a detection Y-axis drive assembly that drives and detects the left and right movement of the Z-axis drive assembly, and a drive detection Y-axis The X-axis drive assembly detects the movement of the drive assembly back and forth.
The PCB board coating quality multifunctional automatic detection equipment according to claim 6, characterized in that it further comprises a PLC controller, the PLC controller is respectively associated with the detection of the X-axis drive assembly, the detection of the Y-axis drive assembly, and the detection of the Z-axis Drive components, CCD camera, camera X-axis drive components, camera Y-axis drive components, camera Z-axis drive components and spring cylinder connection.
The PCB board coating quality multifunctional automatic detection equipment according to claim 1, characterized in that: two sides of the conveying channel are provided with pressing components for fixing the product to be tested, and the pressing components include A pressing cylinder on the outside of the conveying channel and a pressing plate controlled by the pressing cylinder to move up and down, one end of the pressing plate extends to the inner side of the conveying channel.
The multifunctional automatic detection equipment for PCB coating quality according to claim 1 or 8, characterized in that: the conveying channel is provided with a stopper assembly that stops the product to be tested at the test position, and the stopper assembly includes A stopper cylinder fixedly installed under the conveying channel and a stopper plate controlled by the stopper cylinder to move up and down.
The PCB board coating quality multifunctional automatic detection equipment according to claim 1, characterized in that: the outer side of the conveying channel is provided with a wiping assembly for wiping the paint on the detection block, and the wiping assembly is arranged on the CCD On one side of the camera, the wiping assembly includes a wiping belt and a wiping motor that drives the wiping belt to move.