An AOI inspection device and method for reflow solder joints of SMT surface mount circuit boards.

Abstract

The present application relates to the technical fields of circuit board quality inspection, and discloses a kind of SMT patch circuit board reflow solder weld AOI detection device and method thereof, including AOI detection body, the left side of AOI detection body is equipped with conveying assembly, the middle part of AOI detection body is equipped with telescopic component and control assembly;Conveying assembly includes transmission belt, transmission belt is located in the inner chamber of AOI detection body.This application drives screw rod to rotate by conveying assembly, then drives push plate to move, extrudes hydraulic oil in hydraulic box into connecting pipe, makes sliding shaft close to circuit board, and makes clamping support frame clamp and fix the two sides of circuit board, when the other side of circuit board needs to be detected, start motor again to drive push plate to adjust the extrusion amount of hydraulic oil, increase the pressure in connecting pipe, make hydraulic oil enter pressure pipe and push rack to slide, then drive gear ring and rotary tube to rotate one hundred and eighty degrees, drive circuit board to overturn, realize double-sided detection of circuit board.

Description

Technical Field

[0001] This invention relates to the field of circuit board quality inspection technology, and more specifically, to an AOI inspection device and method for reflow solder joints of SMT surface mount circuit boards. Background Technology

[0002] SMT (Surface Mount Technology) reflow soldering is a soldering process where surface mount components are fixed onto a circuit board using solder paste. After soldering, the solder joints need to be inspected for quality. AOI (Automated Optical Inspection) is a commonly used method, using image acquisition and comparison technology to accurately assess the solder joint quality. Most existing AOI inspection devices use a conveyor belt to feed the circuit board under the camera for image acquisition. However, for double-sided circuit boards with electronic components and traces on both sides, existing devices can mostly only inspect one side. After inspection, the circuit board needs to be removed and flipped over for double-sided inspection, making the process complex. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides an AOI inspection device and method for reflow solder joints of SMT surface mount circuit boards, which has the advantages of double-sided inspection and simple operation.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an AOI inspection device for reflow solder joints of SMT surface mount circuit boards, comprising an AOI inspection body, a conveying component on the left side of the AOI inspection body, and a telescopic component and a control component in the middle of the AOI inspection body;

[0005] The conveying assembly includes a drive belt located inside the cavity of the AOI detection body;

[0006] The telescopic assembly includes a support frame, which is fixedly installed on the front and rear sides of the AOI detection body's internal cavity. A rotating tube is rotatably connected to the middle of the support frame, and a sliding shaft is slidably connected to the inner cavity of the rotating tube. A clamping bracket is fixedly installed at the end of the sliding shaft away from the support frame.

[0007] The control component includes a hydraulic box, which is fixedly installed at the bottom of the AOI detection body's internal cavity. A push plate is movably connected to the internal cavity of the hydraulic box. A lead screw that meshes with the push plate is provided in the middle of the hydraulic box. A gear ring is fixedly installed on the outer side of the rotating tube. A rack is meshed at the bottom end of the gear ring. A pressure tube is slidably connected to the rear end of the rack.

[0008] As a preferred embodiment of the present invention, the conveying assembly further includes a frame, a motor is fixedly installed at the front end of the frame, conveying rollers are rotatably connected to the left and right ends of the frame, and a conveyor belt is drivenly connected to the surface of the conveying rollers.

[0009] As a preferred embodiment of the present invention, a slide bar is fixedly installed in the inner cavity of the rotating tube, and a slide groove is provided at the end of the sliding shaft away from the clamping frame. The sliding shaft is slidably connected to the slide bar through the slide groove.

[0010] As a preferred embodiment of the present invention, the push plate engages with the surface of the lead screw, a connecting pipe is fixedly installed at the rear end of the hydraulic box, the end of the pressure pipe away from the clamping frame is fixedly connected to the connecting pipe, and the lead screw is connected to the transmission belt for transmission.

[0011] As a preferred embodiment of the present invention, a drive assembly is fixedly installed at the top of the clamping frame. The drive assembly includes a motor, which is fixedly installed at the top of the clamping frame. A roller is fixedly sleeved at the output end of the motor, and the roller is rotatably connected to the middle of the clamping frame.

[0012] As a preferred embodiment of the present invention, the surface of the rotating tube is provided with a cleaning component, the cleaning component includes a fixing ring, the fixing ring is fixedly installed on the outer surface of the rotating tube, the right end of the fixing ring is rotatably connected to a rotating annular cap, and air tubes are fixedly installed at both the upper and lower ends of the rotating annular cap.

[0013] As a preferred embodiment of the present invention, the end of the air tube away from the support frame is inclined toward the center of the clamping frame, and the air tube is fixedly connected to the clamping frame and distributed on the upper and lower sides of the clamping frame.

[0014] As a preferred embodiment of the present invention, an air blowing assembly is fixedly installed on the top of the hydraulic box. The air blowing assembly includes a fixed box, which is fixedly installed above the hydraulic box. A movable plate is slidably connected to the inner cavity of the upper fixed box, and a push shaft is fixedly installed on one end of the movable plate near the connecting pipe.

[0015] As a preferred embodiment of the present invention, the push shaft is slidably connected inside the connecting pipe, the top end of the fixing box is connected to the bottom end of the fixing ring, and the two are connected by a flexible hose.

[0016] A method for inspecting the solder joints of reflow soldering plates on SMT (Surface Mount Technology) circuit boards using an AOI (Automated Optical Inspection) device, the method comprising the following steps:

[0017] The circuit board is placed above the conveyor belt. The motor drives the conveyor roller to rotate, which in turn causes the conveyor belt to move the circuit board until it extends out of the conveyor belt. During this process, the transmission belt transmits power to the lead screw, which in turn drives the lead screw to rotate. Through the engagement of the lead screw and the push plate, the push plate can be driven to move, pushing the hydraulic oil in the hydraulic box into the connecting pipe.

[0018] At this time, the hydraulic oil pushes the sliding shaft outward, thereby bringing the clamping frame closer to the circuit board, so that the circuit board conveyed from the conveyor belt enters between the two clamping frames. During this process, the hydraulic oil in the connecting pipe will simultaneously push the sliding shaft and the push shaft. The push shaft drives the moving plate to move in the fixed box, pushing the air in the fixed box into the fixed ring, which is then transported to the air pipe through the fixed ring. The air pipe then sprays the air onto the upper and lower sides of the circuit board to clean the dust on the circuit board.

[0019] When the rollers come into contact with the circuit board, the conveyor belt stops moving. At this time, the camera built into the AOI inspection body takes pictures of the weld seams of the circuit board for comparison inspection. After the inspection is completed, the motor starts again. At this time, the clamping frame cannot continue to move due to the obstruction of the circuit board. The hydraulic oil in the connecting pipe increases and the pressure increases, which in turn reaches the opening pressure of the pressure pipe. This allows the hydraulic oil to enter the pressure pipe and push the rack to move, which in turn drives the gear ring to rotate 180 degrees, which in turn drives the clamping frame and the circuit board to rotate 180 degrees, so that the other side of the circuit board can be photographed and inspected.

[0020] After the test is completed, the motor reverses, starts the motor to drive the roller to rotate, and transports the circuit board to the conveyor belt. The circuit board is then transported away by the conveyor belt. During this process, the lead screw reverses, the push plate resets, and the hydraulic oil is drawn back to reset the device.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention drives the lead screw to rotate via a conveying component, which in turn moves the push plate to squeeze the hydraulic oil in the hydraulic box into the connecting pipe, bringing the sliding axis of the circuit board closer and clamping the two sides of the circuit board with a support frame. When it is necessary to inspect the other side of the circuit board, the motor can be restarted to drive the push plate to adjust the amount of hydraulic oil squeezed in, increasing the pressure in the connecting pipe, so that the hydraulic oil enters the pressure pipe and pushes the rack to slide, thereby driving the gear ring and rotating pipe to rotate 180 degrees, causing the circuit board to flip, thus realizing double-sided inspection of the circuit board.

[0023] 2. This invention, by moving the push plate while hydraulic oil enters the connecting pipe, pushes the push shaft, causing the moving plate to move in the opposite direction of the push plate. This forces the air in the moving plate into the fixed ring. When the circuit board is delivered, the lead screw is reversed by the transmission belt, causing the hydraulic oil to flow back into the hydraulic box. This allows the external air to be drawn back into the fixed box through the air pipe. After the air in the air blowing assembly is forced into the fixed ring, the air passes through the fixed ring into the air pipe and is blown onto the upper and lower surfaces of the circuit board to clean the dust on the circuit board, thereby improving the accuracy of the detection. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a cross-sectional schematic diagram of the AOI detection body of the present invention;

[0026] Figure 3 This is a schematic diagram showing the configuration of the two sets of clamping frames in the structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the connection of a single clamping frame in the structure of the present invention;

[0028] Figure 5 This is a cross-sectional schematic diagram of the hydraulic box and the fixing box of the present invention;

[0029] Figure 6 This is a schematic diagram of the exploded connection of the telescopic component of the present invention.

[0030] In the diagram: 1. AOI inspection body; 2. Conveying assembly; 21. Frame; 22. Drive belt; 23. Conveyor belt; 24. Conveying roller; 25. Motor; 3. Telescopic assembly; 31. Support frame; 32. Rotating tube; 33. Sliding shaft; 34. Clamping frame; 4. Control assembly; 41. Hydraulic box; 42. Push plate; 43. Lead screw; 44. Connecting pipe; 45. Pressure pipe; 46. Rack; 47. Gear ring; 5. Drive assembly; 51. Motor; 52. Roller; 6. Cleaning assembly; 61. Fixing ring; 62. Rotating annular cover; 63. Air pipe; 7. Air blowing assembly; 71. Fixing box; 72. Moving plate; 73. Push shaft. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] like Figures 1 to 6 As shown, the present invention provides an AOI inspection device and method for reflow solder joints of SMT surface mount circuit boards, including an AOI inspection body 1, a conveying component 2 on the left side of the AOI inspection body 1, and a telescopic component 3 and a control component 4 in the middle of the AOI inspection body 1.

[0033] The conveying assembly 2 includes a drive belt 22, which is located inside the cavity of the AOI detection body 1;

[0034] The telescopic assembly 3 includes a support frame 31, which is fixedly installed on the front and rear sides of the inner cavity of the AOI detection body 1. A rotating tube 32 is rotatably connected to the middle of the support frame 31, and a sliding shaft 33 is slidably connected to the inner cavity of the rotating tube 32. A clamping bracket 34 is fixedly installed at the end of the sliding shaft 33 away from the support frame 31.

[0035] The control component 4 includes a hydraulic box 41, which is fixedly installed at the bottom of the inner cavity of the AOI detection body 1. A push plate 42 is movably connected to the inner cavity of the hydraulic box 41. A lead screw 43 that meshes with the push plate 42 is provided in the middle of the hydraulic box 41. A gear ring 47 is fixedly installed on the outer side of the rotating tube 32. A rack 46 meshes with the bottom end of the gear ring 47. A pressure tube 45 is slidably connected to the rear end of the rack 46.

[0036] The conveying assembly 2 drives the lead screw 43 to rotate, which in turn moves the push plate 42, squeezing the hydraulic oil in the hydraulic box 41 into the connecting pipe 44. This moves the sliding shaft 33 closer to the circuit board and causes the clamping bracket 34 to clamp and fix both sides of the circuit board. When it is necessary to inspect the other side of the circuit board, the motor 25 can be restarted to drive the push plate 42 to adjust the amount of hydraulic oil squeezed in, increasing the pressure in the connecting pipe 44. This allows the hydraulic oil to enter the pressure pipe 45 and push the rack 46 to slide, thereby driving the gear ring 47 and the rotating pipe 32 to rotate 180 degrees, causing the circuit board to flip and enabling double-sided inspection of the circuit board.

[0037] The conveying assembly 2 also includes a frame 21, a motor 25 is fixedly installed at the front end of the frame 21, and conveying rollers 24 are rotatably connected to the left and right ends of the frame 21. A conveyor belt 23 is connected to the surface of the conveying rollers 24.

[0038] The circuit board is placed above the conveyor belt 23. The output end of the motor 25 is fixedly connected to the left conveyor roller 24. The motor 25 drives the conveyor roller 24 to rotate, which in turn drives the conveyor belt 23 to transport the circuit board to the left or right, and then transport the circuit board into the AOI detection body 1 and remove the circuit board from the AOI detection body 1. When the right conveyor roller 24 rotates, it can drive the lead screw 43 to rotate through the transmission belt 22.

[0039] The inner cavity of the rotating tube 32 is fixedly equipped with a slide bar, and the end of the sliding shaft 33 away from the clamping bracket 34 is provided with a slide groove. The sliding shaft 33 is slidably connected to the slide bar through the slide groove.

[0040] By setting up slide bars and slide grooves, it is ensured that the sliding shaft 33 can only slide back and forth within the rotating tube 32 and cannot rotate relative to the rotating tube 32. This ensures that when the rotating tube 32 rotates, it can smoothly drive the sliding shaft 33 and the clamping frame 34 to rotate.

[0041] In this configuration, the push plate 42 engages with the surface of the lead screw 43, the rear end of the hydraulic box 41 is fixedly installed with a connecting pipe 44, the end of the pressure pipe 45 away from the clamping bracket 34 is fixedly connected to the connecting pipe 44, and the lead screw 43 is connected to the transmission belt 22 for transmission.

[0042] After the lead screw 43 rotates, the engagement between the push plate 42 and the lead screw 43 can drive the push plate 42 to move away from the clamping bracket 34, thereby pushing the hydraulic oil in the hydraulic box 41 into the connecting pipe 44. Since the pressure pipe 45 has a certain opening pressure, when the hydraulic oil enters the connecting pipe 44, it will first enter the rotating pipe 32 and push the sliding shaft 33 to move. When the clamping bracket 34 contacts the circuit board, the sliding shaft 33 cannot move. At this time, the pressure in the connecting pipe 44 will increase to reach the opening pressure of the pressure pipe 45. When the opening pressure of the pressure pipe 45 is reached, the pressure applied by the clamping bracket 34 to the circuit board is insufficient to squeeze and deform the circuit board, thus avoiding damage to the circuit board.

[0043] The top of the clamping frame 34 is fixedly installed with a drive assembly 5, which includes a motor 51. The motor 51 is fixedly installed at the top of the clamping frame 34, and a roller 52 is fixedly sleeved at the output end of the motor 51. The roller 52 is rotatably connected to the middle of the clamping frame 34.

[0044] By setting a roller 52 in the middle of the clamping frame 34 to directly contact the circuit board, and driving the roller 52 to rotate by the motor 51, thereby driving the circuit board to be conveyed, the circuit board can be driven to the center area of ​​the clamping frame 34, or the circuit board can be sent away from the clamping frame 34 to the conveyor belt 23.

[0045] The rotating tube 32 is provided with a cleaning component 6. The cleaning component 6 includes a fixing ring 61, which is fixedly installed on the outer surface of the rotating tube 32. The right end of the fixing ring 61 is rotatably connected to a rotating annular cover 62, and air tubes 63 are fixedly installed at both the upper and lower ends of the rotating annular cover 62.

[0046] When the air in the air blowing assembly 7 is squeezed into the fixing ring 61, the air passes through the fixing ring 61 into the air pipe 63, and is blown onto the upper and lower surfaces of the circuit board through the air pipe 63.

[0047] The end of the air pipe 63 away from the support frame 31 is inclined toward the center of the clamping frame 34. The air pipe 63 is fixedly connected to the clamping frame 34 and distributed on the upper and lower sides of the clamping frame 34.

[0048] By setting the air outlet of the air pipe 63 to an inclined state, the gas ejected from the air pipe 63 can be sprayed onto the circuit board to clean it.

[0049] Among them, the top of the hydraulic box 41 is fixedly installed with an air blowing assembly 7. The air blowing assembly 7 includes a fixed box 71, which is fixedly installed above the hydraulic box 41. The inner cavity of the upper fixed box 71 is slidably connected with a moving plate 72, and a push shaft 73 is fixedly installed at one end of the moving plate 72 near the connecting pipe 44.

[0050] As the push plate 42 moves, the hydraulic oil enters the connecting pipe 44 and pushes the push shaft 73, causing the moving plate 72 to move in the opposite direction of the push plate 42. This forces the air in the moving plate 72 into the fixed ring 61. When the circuit board is delivered, the lead screw 43 is driven to reverse by the transmission belt 22, and the hydraulic oil flows back into the hydraulic box 41. This allows the external air to be drawn back into the fixed box 71 through the air pipe 63.

[0051] The push shaft 73 is slidably connected inside the connecting tube 44, the top end of the fixing box 71 is connected to the bottom end of the fixing ring 61, and the two are connected by a flexible tube.

[0052] The connection between the fixing box 71 and the fixing ring 61 is made of a flexible hose, which ensures the stability of the connection between the fixing box 71 and the fixing ring 61 when the rotating tube 32 rotates. The part of the air tube 63 that is fixedly connected to the clamping frame 34 is a rigid pipe, and the part of the air tube 63 that is connected to the rotating annular cover 62 is also a flexible hose. With the setting of the flexible hose here, when the support frame 34 moves, the flexibility of the flexible hose can be used to ensure that the rotating annular cover 62 will not be pulled away from the fixing ring 61.

[0053] A method for inspecting the solder joints of reflow soldering plates on SMT (Surface Mount Technology) circuit boards using an AOI (Automated Optical Inspection) device, the method comprising the following steps:

[0054] The circuit board is placed above the conveyor belt 23. The motor 25 drives the conveyor roller 24 to rotate, which in turn causes the conveyor belt 23 to move the circuit board until it extends out of the conveyor belt 23. During this process, the transmission belt 22 transmits power to the lead screw 43, which in turn drives the lead screw 43 to rotate. Through the engagement of the lead screw 43 with the push plate 42, the push plate 42 can be driven to move, pushing the hydraulic oil in the hydraulic box 41 into the connecting pipe 44.

[0055] At this time, the hydraulic oil pushes the sliding shaft 33 outward, thereby bringing the clamping frame 34 closer to the circuit board, so that the circuit board conveyed from the conveyor belt 23 enters between the two clamping frames 34. During this process, the hydraulic oil in the connecting pipe 44 will simultaneously push the sliding shaft 33 and the push shaft 73. The push shaft 73 drives the moving plate 72 to move in the fixed box 71, pushing the air in the fixed box 71 into the fixed ring 61, and transporting it through the fixed ring 61 to the air pipe 63, and then spraying it from the air pipe 63 onto the upper and lower sides of the circuit board to clean the dust on the circuit board.

[0056] When roller 52 contacts the circuit board, conveyor belt 23 stops moving. At this time, the camera built into AOI inspection body 1 takes pictures of the weld seam of the circuit board for comparison inspection. After the inspection is completed, motor 25 starts again. At this time, because the clamping frame 34 is blocked by the circuit board and cannot continue to move, the hydraulic oil in the connecting pipe 44 increases and the pressure increases, which in turn reaches the opening pressure of pressure pipe 45, causing hydraulic oil to enter pressure pipe 45 and push rack 46 to move, which in turn drives gear ring 47 to rotate 180 degrees, which drives clamping frame 34 and circuit board to rotate 180 degrees, and takes pictures of the other side of the circuit board for inspection.

[0057] After the test is completed, motor 25 reverses, starting motor 51 drives roller 52 to rotate, transporting the circuit board to conveyor belt 23 and conveying it away. During this process, lead screw 43 reverses, push plate 42 resets and draws back hydraulic oil to reset the device.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A kind of SMT patch circuit board reflow solder joint AOI detection device, including AOI detection body (1), it is characterized in that, The left side of the AOI detection body (1) is provided with a conveying assembly (2), and the middle part of the AOI detection body (1) is provided with a telescopic assembly (3) and a control assembly (4); The conveying assembly (2) comprises a transmission belt (22), which is located in the inner cavity of the AOI detection body (1); The telescopic assembly (3) comprises a support frame (31) fixedly installed on the front and rear sides of the inner cavity of the AOI detection body (1), a rotating pipe (32) rotatably connected to the middle part of the support frame (31), and a sliding shaft (33) slidably connected to the inner cavity of the rotating pipe (32). The control assembly (4) comprises a hydraulic box (41) fixedly installed at the bottom end of the inner cavity of the AOI detection body (1), a push plate (42) movably connected to the inner cavity of the hydraulic box (41), a lead screw (43) provided on the middle part of the hydraulic box (41) and engaged with the push plate (42), a gear ring (47) fixedly installed on the outer side of the rotating pipe (32), a rack (46) engaged with the bottom end of the gear ring (47), and a pressure pipe (45) slidably connected to the rear end of the rack (46). The surface of the rotating pipe (32) is provided with a cleaning assembly (6), the cleaning assembly (6) comprises a fixed ring (61) fixedly installed on the outer surface of the rotating pipe (32), a rotating ring-shaped cover (62) rotatably connected to the right end of the fixed ring (61), and an air pipe (63) fixedly installed on the upper and lower ends of the rotating ring-shaped cover (62). The air pipe (63) is obliquely arranged towards the center of the clamping support frame (34) at the end away from the support frame (31), and the air pipe (63) is fixedly connected with the clamping support frame (34) and distributed on the upper and lower sides of the clamping support frame (34). The top end of the hydraulic box (41) is fixedly provided with a blowing assembly (7), the blowing assembly (7) comprises a fixed box (71) fixedly installed above the hydraulic box (41), and a moving plate (72) slidably connected to the inner cavity of the fixed box (71).

2. The SMT patch circuit board reflow welding seam AOI detection device according to claim 1, characterized in that, The conveying assembly (2) further comprises a rack (21), a motor (25) fixedly installed at the front end of the rack (21), and conveying rollers (24) rotatably connected to the left and right ends of the rack (21).

3. The SMT patch circuit board reflow welding seam AOI detection device according to claim 1, characterized in that, The inner cavity of the rotating pipe (32) is fixedly provided with a sliding strip, and the end of the sliding shaft (33) away from the clamping support frame (34) is provided with a sliding groove, and the sliding shaft (33) is slidably connected to the sliding strip through the sliding groove.

4. The SMT patch circuit board reflow welding seam AOI detection device according to claim 1, characterized in that, The push plate (42) is engaged on the surface of the lead screw (43), the rear end of the hydraulic box (41) is fixedly provided with a connecting pipe (44), the end of the pressure pipe (45) away from the clamping support frame (34) is fixedly connected with the connecting pipe (44), and the lead screw (43) is in transmission connection with the transmission belt (22).

5. The SMT patch circuit board reflow welding seam AOI detection device according to claim 1, characterized in that, The top end of the clamping support frame (34) is fixedly installed with a driving assembly (5), the driving assembly (5) comprises a motor (51), the motor (51) is fixedly installed at the top end of the clamping support frame (34), the output end of the motor (51) is fixedly sleeved with a roller (52), and the roller (52) is rotationally connected to the middle part of the clamping support frame (34).

6. The SMT patch circuit board reflow welding seam AOI detection device according to claim 1, characterized in that, The push shaft (73) is slidingly connected in the connecting pipe (44), the top end of the fixed box (71) is communicated with the bottom end of the fixed ring (61), and the two are connected by using a hose.

7. The detection method of the SMT patch circuit board reflow welding seam AOI detection device according to any one of claims 1-6, characterized in that, The detection method comprises the following steps: The circuit board is placed above the conveying belt (23), the motor (25) drives the conveying roller (24) to rotate, and then the conveying belt (23) drives the circuit board to move out of the conveying belt (23), in the process, the transmission belt (22) transmits power to the lead screw (43), and then drives the lead screw (43) to rotate, through the meshing of the lead screw (43) and the push plate (42), the push plate (42) can be driven to move, and the hydraulic oil in the hydraulic box (41) is pushed into the connecting pipe (44); At this time, the hydraulic oil pushes the sliding shaft (33) out, and then the clamping support frame (34) is close to the circuit board, so that the circuit board conveyed out of the conveying belt (23) enters between the two clamping support frames (34), in the process, the hydraulic oil in the connecting pipe (44) pushes the sliding shaft (33) and the push shaft (73) at the same time, the push shaft (73) drives the moving plate (72) to move in the fixed box (71), and the air in the fixed box (71) is pushed into the fixed ring (61), and then transported to the air pipe (63) through the fixed ring (61), and then sprayed on the upper and lower sides of the circuit board from the air pipe (63), so as to clean the dust on the circuit board; When the roller (52) contacts the circuit board, the conveying belt (23) stops moving, at this time, the camera built in the AOI detection body (1) photographs and compares the weld of the circuit board, after the detection is completed, the motor (25) is started again, at this time, the clamping support frame (34) is hindered by the circuit board and cannot continue to move, the hydraulic oil in the connecting pipe (44) increases the pressure, and then reaches the opening pressure of the pressure pipe (45), so that the hydraulic oil enters the pressure pipe (45) to drive the rack (46) to move, and then drives the gear ring (47) to rotate one hundred and eighty degrees, drives the clamping support frame (34) and the circuit board to rotate one hundred and eighty degrees, and photographs and detects the other side of the circuit board; After the detection is completed, the motor (25) is reversed, the motor (51) is started to drive the roller (52) to rotate, the circuit board is transported to the conveying belt (23), and is conveyed away through the conveying belt (23), in the process, the lead screw (43) is reversed, the push plate (42) is reset to suck back the hydraulic oil, and the device is reset.

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