Circuit board automatic detection device based on AOI visual inspection

Abstract

The invention provides a circuit board automatic detection device based on AOI visual inspection, and relates to the technical field of circuit board welding quality visual identification automatic detection. Comprising a protective shell, feeding ports are formed in the two sides of the protective shell, a set of symmetrically-arranged clamping plates are arranged in the feeding ports of the protective shell, a mounting frame is arranged in the protective shell, a control box is arranged at the bottom of the mounting frame, and a single-chip microcomputer controller is arranged in the control box; and a detection sliding rail is fixedly connected to the top of the mounting frame, a visual camera is slidably connected to the detection sliding rail, and the visual camera is located above the two clamping plates. By arranging the cleaning assembly and the auxiliary assembly, when the circuit board is detected, not only can the surface of the circuit board be cleaned, but also multi-angle light source irradiation can be provided, and distinguishing of defective places on the circuit board is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of visual recognition automatic detection of circuit board welding quality, and in particular to an automatic detection device for circuit boards based on AOI visual inspection. Background Art

[0002] AOI visual inspection machine is an automated equipment that has emerged in China in recent years. It can visually identify the electrical components of circuit boards and automatically detect the welding quality of circuit boards. AOI visual inspection machine has replaced manual inspection of circuit board welding quality, greatly improving production efficiency.

[0003] In the existing AOI visual inspection machine, when the circuit board reaches the inspection position, the sensor sends a signal to the system, and the system sends a command to the cylinder. The gas rod extends out and holds the inspected circuit board in place, waiting for the camera to scan. The clamping mechanism uses the cylinder as an actuator, which requires an air source. If the client does not have a shared air source, a separate air compressor must be equipped to generate the air source, which increases the inspection cost and brings inconvenience to the customer. At the same time, when the circuit board is inspected, the dust on the circuit board will affect the inspection results, and the illumination angle of the light source in the AOI visual inspection machine is relatively single. During the inspection, defects in some positions are not easy to be scanned, resulting in inaccurate inspection results.

[0004] Therefore, the present application provides an automatic circuit board inspection device based on AOI visual inspection to meet the needs. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an automatic circuit board inspection device based on AOI visual inspection to solve the problems that the existing circuit boards are inconvenient to use cylinders when inspecting, there is dust on the circuit boards, and the irradiation angle of the light source is relatively single, which affects the inspection results.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A circuit board automatic inspection device based on AOI visual inspection comprises a protective shell, both sides of the protective shell are provided with feed ports, a group of symmetrically arranged clamping plates are arranged in the feed port of the protective shell, a mounting frame is arranged inside the protective shell, a control box is arranged at the bottom of the mounting frame, a single-chip microcomputer controller is arranged in the control box, a detection slide rail is fixedly connected to the top of the mounting frame, a visual camera is slidably connected to the detection slide rail, the visual camera is located above two clamping plates, and a conveyor belt is arranged on the opposite side of the two clamping plates. The clamping plate is connected to the first motor through a conveying wheel, and a positioning plate is fixedly connected to the top of the clamping plate. A cleaning component is arranged on the visual camera, and the cleaning component is used to clean the dust on the circuit board and the surface of the visual camera. A collecting plate is slidably connected to the mounting frame, and the collecting plate is used to collect the dust blown off by the cleaning component. Clamping components are arranged on opposite sides of the two clamping plates, and the clamping components are used to fix the circuit board under the positioning plate. An auxiliary component is arranged on the outer side of one of the clamping plates, and the auxiliary component is used to provide a side light source for the visual camera when detecting the circuit board.

[0007] Optionally, the cleaning assembly includes a cleaning part, the top of which is fixedly connected to a first gear, one side of the first gear is meshingly connected to a first tooth plate, one side of the first tooth plate is slidably connected to a first oil storage rod, one end of the first oil storage rod is connected to a second oil storage rod via a hose, and a second gear is arranged below the second oil storage rod.

[0008] Optionally, two groups of cleaning heads in an annular array are arranged inside the cleaning ring, one group of cleaning heads is arranged obliquely upward, and the other side of the cleaning heads is arranged obliquely upward, the top of the cleaning ring is fixedly connected to a hollow tube, the other end of the hollow tube is fixedly connected to a rotating ring, the surface of the rotating ring is slidably connected to a sealing ring, the side of the sealing ring is connected to an air pump through a hose, an air pump is arranged in the control box, and the rotating ring is fixedly connected to the bottom of the first gear.

[0009] Optionally, the first gear is rotationally connected to the top of the visual camera, a ratchet is provided inside the first gear, a pawl is provided on the surface of the visual camera, the first gear and the visual camera are connected through the ratchet and the pawl, and the cleaning ring is rotationally connected to the bottom of the visual camera.

[0010] Optionally, the first tooth plate is slidably connected to the bottom of the first slide plate, the first slide plate is fixedly connected to the bottom of the detection slide rail, one side of the first tooth plate is fixedly connected to the first piston rod, and the first piston rod is slidably connected to the first oil storage rod.

[0011] Optionally, the second gear is rotatably connected to the clamping plate, one side of the second gear is fixedly connected to the first cam via a connecting rod, the surface of the first cam is slidably abutted against the second piston rod, the top of the second piston rod is slidably connected to the second oil storage rod, and a spring is arranged between the second piston rod and the second oil storage rod.

[0012] Optionally, the clamping assembly includes a second motor, the output end of the second motor is fixedly connected to a second cam and a first transmission wheel, the center of the upper half of the arc in the second cam is located below the axis of the second motor, the center of the lower half of the arc in the second cam coincides with the axis of the second motor, the second cam is rotatably connected to the bottom of the first support plate, one side of the first support plate is slidably connected to one side of the clamping plate through a guide rail slider, the top of the first support plate is connected to the bottom of the second support plate through a telescopic rod, and a spring is sleeved on the telescopic rod.

[0013] Optionally, the first transmission wheel is connected to the second transmission wheel on one side of the third gear through a belt, the length of the sawtooth structure in the third gear is one quarter of the circumference of the third gear, and the third gear is meshed with the second gear above.

[0014] Optionally, the auxiliary component includes a second slide plate, which is fixedly connected to the clamping plate, and a second tooth plate is slidably connected to the second slide plate. The top of the second tooth plate is fixedly connected to a fill light via a support rod, and the lamp head of the fill light is arranged obliquely downward.

[0015] Optionally, the serrated structure at the bottom of the second tooth plate passes through and is slidably connected to the bottom of the second skateboard, the bottom of the second tooth plate is meshedly connected to a fourth gear, the bottom of the fourth gear is meshedly connected to a fifth gear, one side of the fifth gear is fixedly connected to a third transmission wheel, the third transmission wheel is connected to the fourth transmission wheel on one side of the sixth gear through a belt, and the sixth gear is meshedly connected to the third gear on one side.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by setting up a cleaning component, when the circuit board rises, the cleaning part can clean the dust on the surface of the circuit board and the surface of the visual camera, so that the visual camera can avoid the interference of dust when detecting the circuit board, and make the detection result more accurate. At the same time, when the circuit board is detected again, the visual camera will rotate a certain angle. When detecting the circuit board, the circuit board can be detected at a different angle, so that the taken photos are more comprehensive and the occurrence of inaccurate detection results is reduced.

[0017] By setting up the clamping assembly, when the second cam rotates, the circuit board will gradually move upwards under the action of the second support plate, and finally hold the circuit board in place, waiting for the camera to scan. In this process, by setting up the first support plate and the second support plate, preparatory clamping can be achieved to avoid damage to the circuit board due to excessive pressure. Furthermore, during the inspection of the circuit board, not only can the surface of the circuit board be cleaned, but a movable lateral light source can also be provided when the visual camera scans, so that the visual camera has sufficient light when scanning.

[0018] By setting up auxiliary components, when the third gear rotates from ninety degrees to one hundred and eighty degrees, on the one hand, the sixth gear will continuously rotate, so that the second tooth plate drives the fill light to move. During the movement of the fill light, it will always illuminate the circuit board. On the other hand, the visual camera starts to scan the circuit board. When the visual camera scans the area on the circuit board, the light source on the fill light can illuminate the circuit board from the side. Combined with the vertical light source of the visual camera, multi-angle light source illumination is achieved, which is more conducive to distinguishing defects in the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a circuit board automatic inspection device based on AOI visual inspection; Figure 2 It is a schematic diagram of the internal structure of the circuit board automatic inspection device based on AOI visual inspection; Figure 3 This is a schematic diagram of the structure of the visual camera of the present invention; Figure 4 This is a schematic diagram of the connection structure between the cleaning component and the visual camera of the present invention; Figure 5 It is a structural schematic diagram of the connection between the first gear and the visual camera of the present invention; Figure 6 It is a structural schematic diagram of the bottom of the cleaning part of the present invention; Figure 7 It is a structural schematic diagram of the cleaning component of the present invention; Figure 8 This is a schematic diagram of the second gear structure of the present invention; Fig. 9 It is a partial structural schematic diagram of the present invention; Fig.10 This is a schematic diagram of the inner structure of the clamping plate of the present invention; Fig.11It is a schematic diagram of the structure of the clamping assembly of the present invention; Fig.12 is a schematic diagram of the second cam structure of the present invention; Fig.13 This is a schematic diagram of the outer structure of the clamping plate of the present invention; Fig.14 It is a schematic diagram of the transmission structure between the clamping assembly and the cleaning assembly and the auxiliary assembly of the present invention; Fig.15 It is a schematic diagram of the auxiliary component structure of the present invention; Fig.16 It is a schematic diagram of the bottom structure of the auxiliary component of the present invention.

[0021] Reference numerals: 1. Protective housing; 11. Mounting frame; 111. Control box; 112. Collecting plate; 12. Detection slide rail; 13. Visual camera; 131. Ratchet; 2. Clamping plate; 21. First motor; 22. Conveying belt; 23. Positioning sheet; 3. Cleaning assembly; 31. Cleaning part; 311. Cleaning ring; 312. Hollow tube; 313. Rotating ring; 314. Sealing ring; 315. Cleaning head; 32. First gear; 321. Ratchet; 33. First tooth plate; 331. First slide plate; 332. First piston rod; 34. First oil storage rod; 341 , second oil storage rod; 342, second piston rod; 35, second gear; 351, first cam; 4, clamping assembly; 41, second motor; 411, second cam; 412, first transmission wheel; 42, first support plate; 421, guide rail slider; 43, second support plate; 431, telescopic rod; 44, third gear; 5, auxiliary assembly; 51, second slide plate; 52, second gear plate; 521, support rod; 53, fill light; 54, fourth gear; 55, fifth gear; 551, third transmission wheel; 552, sixth gear; 553, fourth transmission wheel.

[0022] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0023] The following is a detailed description of a circuit board automatic inspection device based on AOI visual inspection provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0024] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0025] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0026] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0027] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0028] like Figures 1 to 16As shown, an embodiment of the present invention provides an automatic circuit board inspection device based on AOI visual inspection, comprising a protective shell 1, wherein both sides of the protective shell 1 are provided with feed ports, a group of symmetrically arranged clamping plates 2 are arranged in the feed port of the protective shell 1, a mounting frame 11 is arranged inside the protective shell 1, a control box 111 is arranged at the bottom of the mounting frame 11, a single-chip microcomputer controller is arranged in the control box 111, a detection slide rail 12 is fixedly connected to the top of the mounting frame 11, a visual camera 13 is slidably connected to the detection slide rail 12, the visual camera 13 is located above the two clamping plates 2, and a conveyor belt 22 is arranged on the opposite side of the two clamping plates 2, and the conveyor belt 22 is connected to the first motor 21 through a conveyor wheel, A positioning piece 23 is fixedly connected to the top of the clamping plate 2, and a cleaning component 3 is arranged on the visual camera 13. The cleaning component 3 is used to clean the dust on the surface of the circuit board and the visual camera 13. A collecting plate 112 is slidably connected to the mounting frame 11. The collecting plate 112 is used to collect the dust blown off by the cleaning component 3. A clamping component 4 is arranged on the opposite side of the two clamping plates 2. The clamping component 4 is used to fix the circuit board under the positioning piece 23. An auxiliary component 5 is arranged on the outer side of one of the clamping plates 2. The auxiliary component 5 is used to provide a side light source for the visual camera 13 when detecting the circuit board. When the operator uses the device to detect the circuit board, the operator needs to put the circuit board in from the feed port and clamp it in The circuit board is located above the conveyor belt 22 between the two clamping plates 2. When the first motor 21 rotates, the circuit board will gradually move to the bottom of the visual camera 13 under the action of the conveyor belt 22. When the circuit board moves to the bottom of the visual camera 13, the photoelectric sensor located on the clamping plate 2 will send a signal to the single-chip controller. The single-chip controller receives the signal and sends a command. The first motor 21 stops running, and then the second motor 41 in the clamping assembly 4 will lift the circuit board upward. The circuit board is finally blocked by the positioning piece 23 above. When the circuit board is blocked, the second motor 41 stops lifting the circuit board. In the process of the circuit board being lifted up, the cleaning assembly 3 will clean the surface of the circuit board and the visual camera 13. The visual camera 13 detects the surface of the circuit board. When the second motor 41 starts to rotate again, the auxiliary component 5 starts to move, and the visual camera 13 starts to detect the surface of the circuit board. When the visual camera 13 is working, the auxiliary component 5 provides an oblique light source, so that the pictures taken by the visual camera 13 when working can be clearer. When the visual camera 13 finishes the detection, the second motor 41 rotates in the reverse direction. When the second motor 41 rotates in the reverse direction, the cleaning component 3, the clamping component 4 and the auxiliary component 5 will gradually return to their original positions. Finally, the first motor 21 starts to rotate, and the conveyor belt 22 will convey the circuit board to the feed port on the other side, so that the operator can collect the circuit board after detection.

[0029] As an implementation method in this embodiment, Figures 2 to 9 and Fig.14As shown, the cleaning assembly 3 includes a cleaning part 31, the top of the cleaning part 31 is fixedly connected with a first gear 32, one side of the first gear 32 is meshedly connected with a first tooth plate 33, one side of the first tooth plate 33 is slidably connected to a first oil storage rod 34, one end of the first oil storage rod 34 is connected to a second oil storage rod 341 through a hose, and a second gear 35 is arranged below the second oil storage rod 341. The cleaning part 31 includes a cleaning ring 311, and two groups of cleaning heads 315 in an annular array are arranged inside the cleaning ring 311, one group of cleaning heads 315 is arranged obliquely upward, and the other side cleaning heads 315 are arranged obliquely upward, the top of the cleaning ring 311 is fixedly connected with a hollow tube 312, and the other end of the hollow tube 312 is fixedly connected to a rotating ring 313, and the rotating ring 313 The surface of the first gear 32 is slidably connected with a sealing ring 314, the side of the sealing ring 314 is connected to the air pump through a hose, the control box 111 is provided with an air pump, the rotating ring 313 is fixedly connected to the bottom of the first gear 32, the first gear 32 is limitedly rotatably connected to the top of the visual camera 13, the inside of the first gear 32 is provided with a ratchet 321, the surface of the visual camera 13 is provided with a pawl 131, the first gear 32 and the visual camera 13 are connected through the ratchet 321 and the pawl 131, the cleaning ring 311 is rotatably connected to the bottom of the visual camera 13, the first tooth plate 33 is slidably connected to the bottom of the first slide plate 331, the first slide plate 331 is fixedly connected to the bottom of the detection slide rail 12, and one side of the first tooth plate 33 is fixedly connected to the first movable The plug rod 332, the first piston rod 332 is slidably connected to the first oil storage rod 34, the second gear 35 is rotatably connected to the clamping plate 2, one side of the second gear 35 is fixedly connected to the first cam 351 through a connecting rod, the surface of the first cam 351 is slidably abutted against the second piston rod 342, the top of the second piston rod 342 is slidably connected to the second oil storage rod 341, and a spring is arranged between the second piston rod 342 and the second oil storage rod 341. When the circuit board moves to the photoelectric sensor, the second motor 41 starts to rotate, and when the second motor 41 rotates, it drives the third gear 44 to rotate, and when the third gear 44 rotates, it drives the second gear 35 to rotate, and when the second gear 35 rotates, it drives the first cam 351 to rotate. When the first cam 351 rotates, the second piston rod 342 will be continuously pushed upward. When the second piston rod 342 is pushed upward, the oil in the second oil storage rod 341 will be squeezed into the first oil storage rod 34 through the hose. When the oil enters the first oil storage rod 34, the first piston rod 332 will be pushed out, thereby pushing the first gear plate 33. When the first gear plate 33 is pushed, the first gear 32 meshingly connected to one side of the first gear plate 33 starts to rotate. When the first gear 32 rotates, it will drive the rotating ring 313 to rotate, so that the cleaning ring 311 rotates around the bottom of the visual camera 13. When the cleaning ring 311 rotates, the gas generated in the pressure pump will enter the cleaning head 315 through the rotating ring 313.The gas ejected from the cleaning head 315 begins to clean the dust on the surface of the circuit board and the visual camera 13. When the second motor 41 rotates in the reverse direction, the third gear 44 rotates in the reverse direction and drives the second gear 35 to rotate in the reverse direction, thereby causing the first cam 351 to rotate in the reverse direction. When the first cam 351 rotates in the reverse direction, the second piston rod 342 slides against the surface of the first cam 351 under the action of the spring. During the descent of the second piston rod 342, the second piston rod 342 draws part of the oil in the first oil storage rod 34 back into the second oil storage rod 341. When the oil in the second oil storage rod 341 decreases, the first piston rod 332 moves in the reverse direction, thereby causing the first tooth plate 33 to move in the reverse direction. When the first tooth plate 33 moves, it drives the first gear 32 to rotate, and with the cooperation of the ratchet 321 and the pawl 131, drives the visual camera 13 to rotate, thereby changing the angle of the visual camera 13.

[0030] In this embodiment, if Figures 2 to 9 and Fig.14 As shown, when the circuit board rises, the cleaning unit 31 can clean the dust on the surface of the circuit board and the surface of the visual camera 13, so that the visual camera 13 can avoid the interference of dust when detecting the circuit board, and make the detection result more accurate. At the same time, when the circuit board is detected again, the visual camera 13 will rotate a certain angle. When detecting the circuit board, the circuit board can be detected at a different angle, so that the taken photos are more comprehensive and the occurrence of inaccurate detection results is reduced.

[0031] As an implementation method in this embodiment, Figures 9 to 14As shown, the clamping assembly 4 includes a second motor 41, and the output end of the second motor 41 is fixedly connected to the second cam 411 and the first transmission wheel 412, the center of the arc of the upper half of the second cam 411 is located below the axis of the second motor 41, and the center of the arc of the lower half of the second cam 411 coincides with the axis of the second motor 41, the second cam 411 is rotatably connected to the bottom of the first support plate 42, one side of the first support plate 42 is slidably connected to one side of the clamping plate 2 through a guide rail slider 421, the top of the first support plate 42 is connected to the bottom of the second support plate 43 through a telescopic rod 431, and a spring is sleeved on the telescopic rod 431, the first transmission wheel 412 is connected to the second transmission wheel on one side of the third gear 44 through a belt, and the serrated structure in the third gear 44 The length of the structure is one quarter of the circumference of the third gear 44, and the third gear 44 is meshed with the second gear 35 above. When the circuit board moves to the photoelectric sensor, the output shaft of the second motor 41 will rotate from zero degree to ninety degrees, and drive the second cam 411 and the first transmission wheel 412 to rotate. On the one hand, when the second cam 411 rotates, the second cam 411 will push the first support plate 42 to move upward continuously. While the first support plate 42 moves upward, it pushes the telescopic rod 431 to move upward, and the telescopic rod 431 will push the second support plate 43 to move upward. The second support plate 43 pushes the circuit board to be detected to move upward. When the second cam 411 rotates to ninety degrees, the circuit board is finally blocked by the positioning piece 23 above, preventing the circuit board from being blocked. The spring on the telescopic rod 431 has a buffering effect. When the circuit board is clamped by the second support plate 43 and the positioning piece 23, the spring is in a compressed state. When the circuit board is cleaned by the cleaning component 3, the output shaft of the second motor 41 will rotate from ninety degrees to one hundred and eighty degrees, and the second cam 411 will rotate to one hundred and eighty degrees synchronously. When the second cam 411 rotates, the first support plate 42 will remain stationary. On the other hand, when the first transmission wheel 412 rotates from zero degrees to ninety degrees, the first transmission wheel 412 will drive the third gear 44 to rotate from zero degrees to ninety degrees through the belt. When the third gear 44 rotates from zero degrees to ninety degrees, the third gear 44 will drive the second gear 35 to rotate , so that the cleaning component 3 starts cleaning. In the process of the third gear 44 rotating from ninety degrees to one hundred and eighty degrees, the third gear 44 will be separated from the second gear 35, and the second gear 35 will stop rotating. At the same time, the third gear 44 is meshed and connected with the sixth gear 552, so that the sixth gear 552 starts to rotate. When the output shaft of the second motor 41 rotates in the opposite direction from one hundred and eighty degrees to ninety degrees, the sixth gear 552 rotates in the opposite direction and is finally separated from the third gear 44. When the output shaft of the second motor 41 rotates in the opposite direction from ninety degrees to zero degrees, the third gear 44 will be meshed and connected with the second gear 35 again, and the second gear 35 will rotate in the opposite direction. At this time, the second cam 411 rotates in the opposite direction, so that the first support plate 42 and the second support plate 43 gradually descend.The circuit board is released, the single chip controller issues a command, the first motor 21 starts running, and the circuit board to be tested is transported to the next feed port.

[0032] In this embodiment, if Figures 9 to 14 As shown, when the second cam 411 rotates, the circuit board will gradually move upwards under the action of the second support plate 43, and finally hold the circuit board in place, waiting for the camera to scan. In this process, by setting the first support plate 42 and the second support plate 43, preparatory clamping can be achieved to avoid damage to the circuit board due to excessive pressure. Furthermore, during the inspection of the circuit board, not only can the surface of the circuit board be cleaned, but a mobile lateral light source can also be provided when the visual camera 13 scans, so that the visual camera 13 has sufficient light when scanning.

[0033] As an implementation method in this embodiment, Fig.13 and Fig.16 As shown, the auxiliary component 5 includes a second slide plate 51, which is fixedly connected to the clamping plate 2, a second tooth plate 52 is slidably connected in the second slide plate 51, a fill light 53 is fixedly connected to the top of the second tooth plate 52 through a support rod 521, and the lamp head of the fill light 53 is arranged obliquely downward, a serrated structure at the bottom of the second tooth plate 52 passes through and is slidably connected to the bottom of the second slide plate 51, a fourth gear 54 is meshedly connected to the bottom of the second tooth plate 52, a fifth gear 55 is meshedly connected to the bottom of the fourth gear 54, a third transmission wheel 551 is fixedly connected to one side of the fifth gear 55, the third transmission wheel 551 is connected to the fourth transmission wheel 553 on one side of the sixth gear 552 through a belt, the sixth gear 552 is meshedly connected to the third gear 44 on one side, and the third transmission wheel 551 is connected to the fourth transmission wheel 553 on one side of the sixth gear 552 through a belt, and the sixth gear 552 is meshedly connected to the third gear 44 on one side. When the gear 44 rotates from ninety degrees to one hundred and eighty degrees, the third gear 44 is meshed with the sixth gear 552, so that the sixth gear 552 starts to rotate. When the sixth gear 552 rotates, the fourth transmission wheel 553 drives the third transmission wheel 551 to rotate through the belt, thereby driving the fifth gear 55 to rotate. When the fifth gear 55 rotates, it will drive the fourth gear 54 to rotate. When the fourth gear 54 rotates, it will drive the second tooth plate 52 to move. When the second tooth plate 52 moves, it will drive the top fill light 53 to move. When the fill light 53 moves, the position of the circuit board will change, so that when the visual camera 13 is scanning, the moving fill light 53 can provide a position where the lateral light source is continuously generated.

[0034] In this embodiment, if Fig.13 and Fig.16As shown, when the third gear 44 rotates from ninety degrees to one hundred and eighty degrees, on the one hand, the sixth gear 552 will continue to rotate, so that the second tooth plate 52 drives the fill light 53 to move. During the movement of the fill light 53, it will always illuminate the circuit board. On the other hand, the visual camera 13 starts to scan the circuit board. When the visual camera 13 scans the area on the circuit board, the light source on the fill light 53 can illuminate the circuit board from the side. Combined with the vertical light source of the visual camera 13, multi-angle light source illumination is achieved, which is more conducive to distinguishing defects in the circuit board.

[0035] The working principle of the technical solution provided by the present invention is as follows: When the operator uses the device to detect the circuit board, the operator needs to put the circuit board in from the feed port and clamp it between the two clamping plates 2 so that the circuit board is located above the conveyor belt 22. When the first motor 21 rotates, the circuit board will gradually move to the bottom of the visual camera 13 under the action of the conveyor belt 22. When the circuit board moves to the bottom of the visual camera 13, the photoelectric sensor located on the clamping plate 2 will send a signal to the single-chip microcomputer controller. The single-chip microcomputer controller receives the signal and sends a command. The first motor 21 stops running, and then the second motor 41 in the clamping assembly 4 will lift the circuit board upward, and the circuit board is finally blocked by the positioning piece 23 above.

[0036] When the circuit board is blocked, the second motor 41 stops lifting the circuit board. During the lifting process of the circuit board, the cleaning component 3 cleans the surface of the circuit board and the surface of the visual camera 13. When the second motor 41 starts to rotate again, the auxiliary component 5 starts to move, and the visual camera 13 starts to detect the surface of the circuit board. When the visual camera 13 is working, the auxiliary component 5 provides an oblique light source so that the photos taken by the visual camera 13 can be clearer. When the visual camera 13 finishes the detection, the second motor 41 rotates in the opposite direction. When the second motor 41 rotates in the opposite direction, the cleaning component 3. The clamping assembly 4 and the auxiliary assembly 5 will gradually return to their original positions, and finally the first motor 21 will start to rotate, and the conveyor belt 22 will convey the circuit board to the feed port on the other side, so that the operator can collect the circuit board after detection. When the circuit board moves to the photoelectric sensor, the second motor 41 starts to rotate. When the second motor 41 rotates, it will drive the third gear 44 to rotate. When the third gear 44 rotates, it will drive the second gear 35 to rotate. When the second gear 35 rotates, it will drive the first cam 351 to rotate. When the first cam 351 rotates, it will continuously push the second piston rod 342 upward.

[0037] When the second piston rod 342 is pushed upward, the oil in the second oil storage rod 341 will be squeezed into the first oil storage rod 34 through the hose. When the oil enters the first oil storage rod 34, the first piston rod 332 will be pushed out, thereby pushing the first gear plate 33. When the first gear plate 33 is pushed, the first gear 32 meshing and connected to one side of the first gear plate 33 starts to rotate. When the first gear 32 rotates, it will drive the rotating ring 313 to rotate, so that the cleaning ring 311 rotates around the bottom of the visual camera 13. When the cleaning ring 311 rotates, the gas generated in the pressure pump will pass through the rotating ring 313 enters into the cleaning head 315, and the gas ejected from the cleaning head 315 begins to clean the dust on the surface of the circuit board and the visual camera 13. When the second motor 41 rotates in the reverse direction, the third gear 44 rotates in the reverse direction and drives the second gear 35 to rotate in the reverse direction, thereby causing the first cam 351 to rotate in the reverse direction. When the first cam 351 rotates in the reverse direction, the second piston rod 342 will slide closely against the surface of the first cam 351 under the action of the spring. During the descending process of the second piston rod 342, the second piston rod 342 will draw part of the oil in the first oil storage rod 34 back into the second oil storage rod 341.

[0038] When the oil in the second oil storage rod 341 is reduced, the first piston rod 332 will move in the opposite direction, so that the first tooth plate 33 will move in the opposite direction. When the first tooth plate 33 moves, it will drive the first gear 32 to rotate, and under the cooperation of the ratchet 321 and the pawl 131, it will drive the visual camera 13 to rotate, and change the angle of the visual camera 13. When the circuit board rises, the cleaning part 31 can clean the dust on the surface of the circuit board and the surface of the visual camera 13, so that the visual camera 13 can avoid the interference of dust when detecting the circuit board, so that the detection result is more accurate. At the same time, when the circuit board is detected again During detection, the visual camera 13 will rotate a certain angle. When detecting the circuit board, the circuit board can be detected at a different angle, so that the photos taken are more comprehensive and the occurrence of inaccurate detection results is reduced. When the circuit board moves to the photoelectric sensor, the output shaft of the second motor 41 will rotate from zero degrees to ninety degrees, and drive the second cam 411 and the first transmission wheel 412 to rotate. On the one hand, when the second cam 411 rotates, the second cam 411 will push the first support plate 42 to move upward continuously. When the first support plate 42 moves upward, it pushes the telescopic rod 431 to move upward.

[0039] The telescopic rod 431 will push the second support plate 43 to move upward, and the second support plate 43 will push the circuit board to be tested to move upward. When the second cam 411 rotates to ninety degrees, the circuit board is finally blocked by the upper positioning piece 23 to prevent the circuit board from being broken by the second support plate 43 and the positioning piece 23. The spring on the telescopic rod 431 has a buffering effect. When the circuit board is clamped by the second support plate 43 and the positioning piece 23, the spring is in a compressed state. When the circuit board is cleaned by the cleaning component 3, the output shaft of the second motor 41 will rotate from ninety degrees to one hundred and eighty degrees, and the second cam 411 will rotate synchronously. To one hundred and eighty degrees, when the second cam 411 rotates, the first support plate 42 will remain stationary. On the other hand, when the first transmission wheel 412 rotates from zero degrees to ninety degrees, the first transmission wheel 412 will drive the third gear 44 to rotate from zero degrees to ninety degrees through the belt. When the third gear 44 rotates from zero degrees to ninety degrees, the third gear 44 will drive the second gear 35 to rotate, so that the cleaning component 3 starts cleaning. When the third gear 44 rotates from ninety degrees to one hundred and eighty degrees, the third gear 44 will separate from the second gear 35, and the second gear 35 stops rotating.

[0040] At the same time, the third gear 44 is meshed with the sixth gear 552, so that the sixth gear 552 starts to rotate. When the output shaft of the second motor 41 rotates in the opposite direction from 180 degrees to 90 degrees, the sixth gear 552 rotates in the opposite direction and finally separates from the third gear 44. When the output shaft of the second motor 41 rotates in the opposite direction from 90 degrees to zero degrees, the third gear 44 will be meshed with the second gear 35 again and the second gear 35 rotates in the opposite direction. At this time, the second cam 411 rotates in the opposite direction, causing the first support plate 42 and the second support plate 43 to gradually descend, the circuit board is released, and the single-chip controller issues a command, and the first motor 21 starts During operation, the circuit board to be tested is conveyed to the next feed port, and when the second cam 411 rotates, the circuit board will gradually move upwards under the action of the second support plate 43, and finally hold the circuit board in place, waiting for the camera to scan. In this process, by setting the first support plate 42 and the second support plate 43, preparatory clamping can be achieved, thus avoiding damage to the circuit board due to excessive pressure. Furthermore, in the process of testing the circuit board, not only can the surface of the circuit board be cleaned, but a movable lateral light source can also be provided when the visual camera 13 scans, so that the visual camera 13 has sufficient light when scanning.

[0041] When the third gear 44 rotates from ninety degrees to one hundred and eighty degrees, the third gear 44 is meshed with the sixth gear 552, so that the sixth gear 552 starts to rotate. When the sixth gear 552 rotates, the fourth transmission wheel 553 drives the third transmission wheel 551 to rotate through the belt, thereby driving the fifth gear 55 to rotate. When the fifth gear 55 rotates, it will drive the fourth gear 54 to rotate. When the fourth gear 54 rotates, it will drive the second tooth plate 52 to move. When the second tooth plate 52 moves, it will drive the top fill light 53 to move. When the fill light 53 moves, the position of the circuit board will change, so that the visual camera 13 can move. During scanning, the moving fill light 53 can provide a light source that continuously changes sideways at a position. When the third gear 44 rotates from ninety degrees to one hundred and eighty degrees, on the one hand, the sixth gear 552 will continuously rotate, so that the second gear plate 52 drives the fill light 53 to move. During the movement of the fill light 53, it will always illuminate the circuit board. On the other hand, the visual camera 13 starts to scan the circuit board. When the visual camera 13 scans the area on the circuit board, the light source on the fill light 53 can illuminate the circuit board from the side. Combined with the vertical light source of the visual camera 13, multi-angle light source illumination is achieved, which is more conducive to distinguishing defects in the circuit board.

[0042] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A circuit board automatic inspection device based on AOI visual inspection, characterized in that: It comprises a protective shell, both sides of which are provided with feed ports, a group of symmetrically arranged clamping plates are arranged in the feed port of the protective shell, a mounting frame is arranged inside the protective shell, a control box is arranged at the bottom of the mounting frame, a single-chip microcomputer controller is arranged in the control box, and a detection slide rail is fixedly connected to the top of the mounting frame; A visual camera is slidably connected to the detection slide rail, and the visual camera is located above the two clamping plates. Conveying belts are arranged on opposite sides of the two clamping plates, and the conveying belts are connected to the first motor through conveying wheels. A positioning sheet is fixedly connected to the top of the clamping plate. A cleaning component is provided on the visual camera, and the cleaning component is used to clean dust on the circuit board and the surface of the visual camera. A collecting plate is slidably connected to the mounting frame, and the collecting plate is used to collect dust blown off by the cleaning component. A clamping component is provided on opposite sides of the two clamping plates, and the clamping component is used to fix the circuit board under the positioning plate. An auxiliary component is provided on the outer side of one of the clamping plates, and the auxiliary component is used to provide a side light source for the visual camera when detecting the circuit board.

2. The circuit board automatic inspection device based on AOI visual inspection according to claim 1 is characterized in that: The cleaning assembly includes a cleaning part, a first gear is fixedly connected to the top of the cleaning part, one side of the first gear is meshingly connected to a first tooth plate, one side of the first tooth plate is slidably connected to a first oil storage rod, one end of the first oil storage rod is connected to a second oil storage rod through a hose, and a second gear is arranged below the second oil storage rod.

3. The circuit board automatic inspection device based on AOI visual inspection according to claim 2 is characterized in that: The cleaning part includes a cleaning ring, and two groups of cleaning heads in an annular array are arranged inside the cleaning ring. One group of cleaning heads is arranged obliquely upward, and the other side of the cleaning heads is arranged obliquely upward. The top of the cleaning ring is fixedly connected to a hollow tube, and the other end of the hollow tube is fixedly connected to a rotating ring. A sealing ring is slidably connected to the surface of the rotating ring, and the side of the sealing ring is connected to an air pump through a hose. An air pump is arranged in the control box, and the rotating ring is fixedly connected to the bottom of the first gear.

4. The circuit board automatic inspection device based on AOI visual inspection according to claim 3 is characterized in that: The first gear is rotationally connected to the top of the visual camera in a limited position, a ratchet is arranged inside the first gear, a pawl is arranged on the surface of the visual camera, the first gear and the visual camera are connected through the ratchet and the pawl, and the cleaning ring is rotationally connected to the bottom of the visual camera.

5. The circuit board automatic inspection device based on AOI visual inspection according to claim 4 is characterized in that: The first tooth plate is slidably connected to the bottom of the first slide plate, the first slide plate is fixedly connected to the bottom of the detection slide rail, one side of the first tooth plate is fixedly connected to a first piston rod, and the first piston rod is slidably connected to the first oil storage rod.

6. The circuit board automatic inspection device based on AOI visual inspection according to claim 5 is characterized in that: The second gear is rotatably connected to the clamping plate, one side of the second gear is fixedly connected to the first cam through a connecting rod, the surface of the first cam is slidably abutted against the second piston rod, the top of the second piston rod is slidably connected to the second oil storage rod, and a spring is arranged between the second piston rod and the second oil storage rod.

7. The circuit board automatic inspection device based on AOI visual inspection according to claim 6 is characterized in that: The clamping assembly includes a second motor, an output end of the second motor is fixedly connected to a second cam and a first transmission wheel, the center of the upper arc of the second cam is located below the axis of the second motor, the center of the lower arc of the second cam coincides with the axis of the second motor, the second cam is rotatably connected to the bottom of the first support plate, one side of the first support plate is slidably connected to one side of the clamping plate through a guide rail slider, the top of the first support plate is connected to the bottom of the second support plate through a telescopic rod, and a spring is sleeved on the telescopic rod.

8. The circuit board automatic inspection device based on AOI visual inspection according to claim 7 is characterized in that: The first transmission wheel is connected to the second transmission wheel on one side of the third gear through a belt. The length of the sawtooth structure in the third gear is one quarter of the circumference of the third gear. The third gear is meshed and connected with the second gear above.

9. The circuit board automatic inspection device based on AOI visual inspection according to claim 8, characterized in that: The auxiliary component includes a second slide plate, which is fixedly connected to the clamping plate. A second tooth plate is slidably connected to the second slide plate. A fill light is fixedly connected to the top of the second tooth plate via a support rod. The lamp head of the fill light is arranged obliquely downward.

10. The circuit board automatic inspection device based on AOI visual inspection according to claim 9, characterized in that: The serrated structure at the bottom of the second tooth plate passes through and is slidably connected to the bottom of the second skateboard; the bottom of the second tooth plate is meshedly connected to the fourth gear; the bottom of the fourth gear is meshedly connected to the fifth gear; one side of the fifth gear is fixedly connected to the third transmission wheel; the third transmission wheel is connected to the fourth transmission wheel on one side of the sixth gear through a belt; the sixth gear is meshedly connected to the third gear on one side.

Images