AOI (automatic optical inspection) device and method for reflow soldering seam of SMT (surface mount technology) circuit board

Abstract

The invention relates to the technical field of circuit board quality inspection, and discloses an SMT patch circuit board reflow soldering seam AOI detection device and a method thereof.The SMT patch circuit board reflow soldering seam AOI detection device comprises an AOI detection body, a conveying assembly is arranged on the left side of the AOI detection body, and a telescopic assembly and a control assembly are arranged in the middle of the AOI detection body; the conveying assembly comprises a transmission belt, and the transmission belt is located in the inner cavity of the AOI detection body. The conveying assembly drives the lead screw to rotate, then the push plate is driven to move, hydraulic oil in the hydraulic box is squeezed into the connecting pipe, the sliding shaft approaches the circuit board, and the clamping and supporting frames clamp and fix the two sides of the circuit board. The motor is started again to drive the push plate to adjust the extrusion amount of the hydraulic oil and increase the pressure in the connecting pipe, so that the hydraulic oil enters the pressure pipe to push the rack to slide, and then the gear ring and the rotating pipe are driven to rotate by 180 degrees, the circuit board is driven to turn over, and double-sided detection of the circuit board is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board quality inspection, and more particularly to an AOI detection device and method for detecting reflow soldering seams of SMT circuit boards. Background Art

[0002] SMT circuit board reflow soldering is a soldering process that fixes the surface mount components to the circuit board using solder paste. After soldering is completed, the weld seam needs to be inspected for quality. AOI inspection is one of the commonly used inspection methods, which uses image acquisition and comparison technology at the weld seam to accurately judge the quality of the weld seam. Most existing AOI inspection devices use a conveyor belt to convey the circuit board to the bottom of the AOI inspection device's camera for collection. However, for double-sided circuit boards with electronic components and traces on both sides, most existing devices can only inspect one side. After the inspection is completed, the double-sided circuit board needs to be taken out and turned over before double-sided inspection can be performed, which is complicated to operate. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides an SMT circuit board reflow soldering seam AOI detection device and method thereof, which has the advantages of double-sided detection and simple operation.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: an AOI inspection device for reflow soldering of SMT circuit boards, comprising an AOI inspection body, a conveying assembly being provided on the left side of the AOI inspection body, and a telescopic assembly and a control assembly being provided in the middle of the AOI inspection body; The conveying assembly includes a transmission belt, and the transmission belt is located in the inner cavity of the AOI detection body; The telescopic assembly includes a support frame, which is fixedly mounted on the front and rear sides of the inner cavity of the AOI detection body. The middle part of the support frame is rotatably connected to a rotating tube, and the inner cavity of the rotating tube is slidably connected to a sliding shaft. The end of the sliding shaft away from the support frame is fixedly mounted with a clamping frame; The control component includes a hydraulic box, which is fixedly installed at the bottom end of the inner cavity of the AOI detection body. The inner cavity of the hydraulic box is movably connected to a push plate. A screw engaged 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. The bottom end of the gear ring is engaged with a rack, and the rear end of the rack is slidably connected to a pressure tube.

[0005] As a preferred technical solution of the present invention, the conveying assembly also includes a frame, a motor is fixedly installed on the front end of the frame, the left and right ends of the frame are rotatably connected to conveying rollers, and the surface of the conveying rollers is transmission-connected to the conveyor belt.

[0006] As a preferred technical solution of the present invention, a slide bar is fixedly installed in the inner cavity of the rotating tube, a slide groove is provided at one end of the sliding shaft away from the clamping frame, and the sliding shaft is slidably connected to the slide bar through the slide groove.

[0007] As a preferred technical solution of the present invention, the push plate engages with the surface of the 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 screw is connected to the transmission belt.

[0008] As a preferred technical solution of the present invention, a driving assembly is fixedly installed on the top of the clamping frame, and the driving assembly includes a motor. The motor is fixedly installed on the top of the clamping frame, and the output end of the motor is fixedly sleeved with a roller, and the roller is rotatably connected to the middle part of the clamping frame.

[0009] As a preferred technical solution of the present invention, a cleaning assembly is provided on the surface of the rotating tube, and the cleaning assembly includes a fixing ring, which 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 cover, and the upper and lower ends of the rotating annular cover are fixedly installed with air pipes.

[0010] As a preferred technical solution of the present invention, the end of the air pipe away from the support frame is inclined toward the center of the clamping frame, and the air pipe is fixedly connected to the clamping frame and distributed on the upper and lower sides of the clamping frame.

[0011] As a preferred technical solution of the present invention, a blowing assembly is fixedly installed on the top of the hydraulic box, and the blowing assembly includes a fixed box, which is fixedly installed above the hydraulic box. The inner cavity of the upper fixed box is slidably connected to a movable plate, and the movable plate is fixedly installed with a push shaft at one end close to the connecting pipe.

[0012] As a preferred technical solution of the present invention, the push shaft is slidably connected in the connecting pipe, the top end of the fixing box is communicated with the bottom end of the fixing ring, and the two are connected by a hose.

[0013] A detection method for an SMT circuit board reflow soldering seam AOI detection device, the detection method comprising the following steps: Place the circuit board on top of 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. The lead screw engages with the push plate, which drives the push plate to move and pushes the hydraulic oil in the hydraulic box into the connecting pipe. At this time, the hydraulic oil pushes the sliding shaft outward, and then the clamping frame approaches 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 movable plate to move in the fixed box, pushing the air in the fixed box into the fixed ring, and then transported to the air pipe through the fixed ring. Then, the air is sprayed from the air pipe on the upper and lower sides of the circuit board to clean the dust on the circuit board. When the roller contacts the circuit board, the conveyor belt stops moving. At this time, the camera built into the AOI inspection body takes a picture of the circuit board's weld seam for comparison inspection. After the inspection is completed, the motor starts again. At this time, the clamping frame is blocked by the circuit board and cannot move further. The hydraulic oil in the connecting pipe increases and the pressure increases, reaching the opening pressure of the pressure pipe. The hydraulic oil enters the pressure pipe and pushes the rack to move, which in turn drives the gear ring to rotate 180 degrees. The clamping frame and the circuit board rotate 180 degrees, and the other side of the circuit board is photographed and inspected. After the inspection is completed, the motor reverses and starts to drive the roller to rotate, transporting the circuit board to the conveyor belt and then transporting it away. During this process, the lead screw reverses and the push plate resets to draw back the hydraulic oil and reset the device.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention drives the screw to rotate through the conveying assembly, thereby driving the push plate to move, squeezing the hydraulic oil in the hydraulic box into the connecting pipe, moving the sliding axis closer to the circuit board, and allowing the clamping frame to clamp both sides of the fixed circuit board. When it is necessary to inspect the other side of the circuit board, starting the motor again can drive the push plate to adjust the amount of hydraulic oil squeezed into it, increase the pressure in the connecting pipe, and allow the hydraulic oil to enter the pressure pipe to push the rack to slide, thereby driving the gear ring and the rotating tube to rotate 180 degrees, driving the circuit board to flip, and realizing double-sided inspection of the circuit board.

[0015] 2. The present invention pushes the push shaft while the push plate moves, and the movable plate moves in the opposite direction of the push plate, squeezing the air in the movable plate into the fixed ring. When the circuit board is sent out, the lead screw is driven to reverse by the transmission belt, and the hydraulic oil flows back to the hydraulic box, so that the external air can be drawn back into the fixed box through the air pipe again. After the air in the blowing assembly is squeezed into the fixed ring, the air enters the air pipe through the fixed ring and is blown onto the upper and lower surfaces of the circuit board through the air pipe to clean the dust on the circuit board, thereby improving the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the AOI inspection body of the present invention; Figure 3 This is a schematic diagram of the arrangement of two sets of clamping brackets in the structure of the present invention; Figure 4 This is a schematic diagram of the connection of a single clamping frame of the structure of the present invention; Figure 5 This is a cross-sectional schematic diagram of the hydraulic box and the fixed box of the present invention; Figure 6 This is a schematic diagram of the explosive connection of the structural telescopic components of the present invention.

[0017] In the figure: 1. AOI detection body; 2. Conveying assembly; 21. Frame; 22. Transmission belt; 23. Conveyor belt; 24. Conveyor 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. Screw; 44. Connecting pipe; 45. Pressure pipe; 46. Rack; 47. Gear ring; 5. Driving assembly; 51. Motor; 52. Roller; 6. Cleaning assembly; 61. Fixed ring; 62. Rotating ring cover; 63. Air pipe; 7. Blowing assembly; 71. Fixed box; 72. Moving plate; 73. Push shaft. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1 to 6 As shown, the present invention provides an SMT circuit board reflow soldering seam AOI detection device and method thereof, comprising an AOI detection body 1, a conveying component 2 is provided on the left side of the AOI detection body 1, and a telescopic component 3 and a control component 4 are provided in the middle of the AOI detection body 1; The conveying assembly 2 includes a transmission belt 22, which is located in the inner cavity of the AOI detection body 1; The telescopic assembly 3 includes a support frame 31, which is fixedly mounted on the front and rear sides of the inner cavity of the AOI detection body 1. The middle part of the support frame 31 is rotatably connected to a rotating tube 32, and the inner cavity of the rotating tube 32 is slidably connected to a sliding shaft 33. The end of the sliding shaft 33 away from the support frame 31 is fixedly mounted with a clamping frame 34. The control component 4 includes a hydraulic box 41, which is fixedly installed at the bottom end of the inner cavity of the AOI detection body 1. The inner cavity of the hydraulic box 41 is movably connected to a push plate 42. A screw 43 engaged 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. The bottom end of the gear ring 47 is engaged with a rack 46. The rear end of the rack 46 is slidably connected to a pressure tube 45.

[0020] The screw 43 is driven to rotate by the conveying component 2, thereby driving the push plate 42 to move, squeezing the hydraulic oil in the hydraulic box 41 into the connecting tube 44, moving the sliding shaft 33 closer to the circuit board, and making the clamping frame 34 clamp both sides of the fixed circuit board. When it is necessary to inspect the other side of the circuit board, starting the motor 25 again can drive the push plate 42 to adjust the amount of hydraulic oil squeezed in, increase the pressure in the connecting tube 44, and make the hydraulic oil enter the pressure tube 45 to push the rack 46 to slide, thereby driving the gear ring 47 and the rotating tube 32 to rotate one hundred and eighty degrees, driving the circuit board to flip, and realizing double-sided inspection of the circuit board.

[0021] The conveying assembly 2 further includes a frame 21 , a motor 25 is fixedly mounted on the front end of the frame 21 , and conveying rollers 24 are rotatably connected to the left and right ends of the frame 21 , and a conveying belt 23 is transmission-connected to the surface of the conveying rollers 24 .

[0022] The circuit board is placed on top of the conveyor belt 23. The output end of the motor 25 is fixedly connected to the conveyor roller 24 on the left. The motor 25 drives the conveyor roller 24 to rotate, thereby driving the conveyor belt 23 to convey the circuit board to the left or right, thereby conveying the circuit board to the AOI inspection body 1 and taking the circuit board out of the AOI inspection body 1. When the conveyor roller 24 on the right rotates, the transmission belt 22 can drive the screw 43 to rotate.

[0023] A sliding bar is fixedly installed in the inner cavity of the rotating tube 32 , and a sliding groove is provided at one end of the sliding shaft 33 away from the clamping frame 34 , and the sliding shaft 33 is slidably connected to the sliding bar through the sliding groove.

[0024] By providing the slide bars and the slide grooves, it is ensured that the sliding shaft 33 can only slide back and forth in the rotating tube 32 and cannot rotate relative to the rotating tube 32, thereby ensuring that when the rotating tube 32 rotates, it can smoothly drive the sliding shaft 33 and the clamping frame 34 to rotate.

[0025] Among them, the push plate 42 is engaged with the surface of the 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 frame 34 is fixedly connected to the connecting pipe 44, and the screw 43 is connected to the transmission belt 22 for transmission.

[0026] After the screw 43 rotates, the engagement of the push plate 42 with the screw 43 can drive the push plate 42 to move to the side away from the clamping frame 34, and then push 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 tube 32, pushing the sliding shaft 33 to move. When the clamping frame 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 pressure of opening the pressure pipe 45, and when the opening pressure of the pressure pipe 45 is reached, the pressure applied to the circuit board by the clamping frame 34 is not enough to squeeze and deform the circuit board, thereby avoiding damage to the circuit board.

[0027] Among them, the driving component 5 is fixedly installed on the top of the clamping frame 34, and the driving component 5 includes a motor 51. The motor 51 is fixedly installed on the top of the clamping frame 34, and the output end of the motor 51 is fixedly sleeved with a roller 52, which is rotatably connected to the middle part of the clamping frame 34.

[0028] 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 transportation of the circuit board, the circuit board can be driven to the central area of ​​the clamping frame 34, and the circuit board can also be sent away from the clamping frame 34 to the conveyor belt 23.

[0029] Among them, a cleaning component 6 is provided on the surface of the rotating tube 32, and 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 the upper and lower ends of the rotating annular cover 62 are fixedly installed with an air pipe 63.

[0030] When the air in the blowing assembly 7 is squeezed into the fixing ring 61 , the air passes through the fixing ring 61 and enters the air pipe 63 , and is blown onto the upper and lower surfaces of the circuit board through the air pipe 63 .

[0031] The end of the air pipe 63 away from the support frame 31 is arranged obliquely toward the center of the clamping frame 34 . The air pipe 63 is fixedly connected to the clamping frame 34 and is distributed on the upper and lower sides of the clamping frame 34 .

[0032] By setting the gas outlet end of the gas pipe 63 in an inclined state, the gas ejected from the gas pipe 63 can be sprayed onto the circuit board to clean the circuit board.

[0033] Among them, a blowing assembly 7 is fixedly installed on the top of the hydraulic box 41, and the blowing assembly 7 includes a fixed box 71. The fixed box 71 is fixedly installed above the hydraulic box 41. The inner cavity of the upper fixed box 71 is slidably connected to a movable plate 72, and a push shaft 73 is fixedly installed on one end of the movable plate 72 close to the connecting pipe 44.

[0034] As the push plate 42 moves, the hydraulic oil enters the connecting pipe 44 and pushes the push shaft 73, thereby moving the movable plate 72 in the opposite direction of the push plate 42, squeezing the air in the movable plate 72 into the fixed ring 61, and when the circuit board is sent out, the screw 43 is driven to reverse by the transmission belt 22, and the hydraulic oil flows back to the hydraulic box 41, and the external air can be drawn back into the fixed box 71 through the air pipe 63 again.

[0035] The push shaft 73 is slidably connected in the connecting pipe 44 , and the top end of the fixing box 71 is communicated with the bottom end of the fixing ring 61 , and the two are connected by a hose.

[0036] A hose is used to connect the fixed box 71 and the fixed ring 61, so that the connection position between the two has ductility. When the rotating tube 32 rotates, the stability of the connection between the fixed box 71 and the fixed ring 61 can be guaranteed. The part where the air pipe 63 is fixedly connected to the clamping frame 34 is a hard pipe, and the part where the air pipe 63 is connected to the rotating annular cover 62 is also a hose. Through the setting of the hose here, when the support frame 34 moves, the elasticity of the hose can be used to ensure that the rotating annular cover 62 will not be pulled away from the fixed ring 61.

[0037] A detection method for an SMT circuit board reflow soldering seam AOI detection device, the detection method comprising the following steps: The circuit board is placed on 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 screw 43, which in turn drives the screw 43 to rotate. The screw 43 engages with the push plate 42, which drives the push plate 42 to move, pushing the hydraulic oil in the hydraulic box 41 into the connecting pipe 44. At this time, the hydraulic oil pushes the sliding shaft 33 outward, thereby making the clamping frame 34 close 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 pushing shaft 73. The pushing shaft 73 drives the movable plate 72 to move in the fixed box 71, pushing the air in the fixed box 71 into the fixed ring 61, and then transported to the air pipe 63 through the fixed ring 61. Then, the air is sprayed from the air pipe 63 to the upper and lower sides of the circuit board to clean the dust on the circuit board. When the roller 52 contacts the circuit board, the conveyor belt 23 stops moving. At this time, the camera built into the AOI inspection body 1 takes a picture of the weld of the circuit board for comparison inspection. After the inspection is completed, the motor 25 starts again. At this time, the clamping frame 34 is blocked by the circuit board and cannot move further. The hydraulic oil in the connecting pipe 44 increases and the pressure increases, thereby reaching the opening pressure of the pressure pipe 45. The hydraulic oil enters the pressure pipe 45 and pushes the rack 46 to move, which in turn drives the gear ring 47 to rotate 180 degrees. The clamping frame 34 and the circuit board are rotated 180 degrees, and the other side of the circuit board is photographed and inspected. After the test is completed, the motor 25 reverses, and the starting motor 51 drives the roller 52 to rotate, transporting the circuit board to the conveyor belt 23, and then transporting it away through the conveyor belt 23. During this process, the screw 43 reverses, and the push plate 42 resets to draw back the hydraulic oil and reset the device.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An AOI detection device for reflow soldering of SMT circuit boards, comprising an AOI detection body (1), characterized in that: A conveying assembly (2) is provided on the left side of the AOI detection body (1), and a telescopic assembly (3) and a control assembly (4) are provided in the middle of the AOI detection body (1); The conveying assembly (2) comprises a transmission belt (22), and the transmission belt (22) is located in the inner cavity of the AOI detection body (1); The telescopic assembly (3) includes a support frame (31), the support frame (31) is fixedly mounted on the front and rear sides of the inner cavity of the AOI detection body (1), the middle part of the support frame (31) is rotatably connected to a rotating tube (32), the inner cavity of the rotating tube (32) is slidably connected to a sliding shaft (33), and the end of the sliding shaft (33) away from the support frame (31) is fixedly mounted with a clamping frame (34); The control assembly (4) includes a hydraulic box (41), which is fixedly mounted at the bottom end of the inner cavity of the AOI detection body (1), and the inner cavity of the hydraulic box (41) is movably connected to a push plate (42). The middle portion of the hydraulic box (41) is provided with a lead screw (43) engaged with the push plate (42), and a gear ring (47) is fixedly mounted on the outer side of the rotating tube (32), and the bottom end of the gear ring (47) is engaged with a rack (46), and the rear end of the rack (46) is slidably connected to a pressure tube (45).

2. The SMT circuit board reflow soldering AOI detection device according to claim 1, characterized in that: The conveying assembly (2) further comprises a frame (21), a motor (25) being fixedly mounted on the front end of the frame (21), and conveying rollers (24) being rotatably connected to the left and right ends of the frame (21), and a conveying belt (23) being rotatably connected to the surface of the conveying rollers (24).

3. The SMT circuit board reflow soldering AOI inspection device according to claim 1, characterized in that: A slide bar is fixedly mounted in the inner cavity of the rotating tube (32), and a slide groove is provided at one end of the sliding shaft (33) away from the clamping frame (34), and the sliding shaft (33) is slidably connected to the slide bar through the slide groove.

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

5. The SMT circuit board reflow soldering AOI inspection device according to claim 1, characterized in that: A driving assembly (5) is fixedly mounted on the top of the clamping frame (34), and the driving assembly (5) includes a motor (51). The motor (51) is fixedly mounted on the top of the clamping frame (34), and a roller (52) is fixedly sleeved on the output end of the motor (51), and the roller (52) is rotatably connected to the middle of the clamping frame (34).

6. The SMT circuit board reflow soldering AOI inspection device according to claim 1, characterized in that: A cleaning assembly (6) is provided on the surface of the rotating tube (32), and the cleaning assembly (6) comprises a fixing ring (61), and the fixing ring (61) is fixedly mounted 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 an air pipe (63) is fixedly mounted on both the upper and lower ends of the rotating annular cover (62).

7. The SMT circuit board reflow soldering AOI inspection device according to claim 6, characterized in that: One end of the air pipe (63) away from the support frame (31) is arranged obliquely toward the center of the clamping frame (34), and 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).

8. The SMT circuit board reflow soldering seam AOI detection device according to claim 6, characterized in that: A blowing assembly (7) is fixedly mounted on the top of the hydraulic box (41), and the blowing assembly (7) comprises a fixed box (71). The fixed box (71) is fixedly mounted above the hydraulic box (41), and a movable plate (72) is slidably connected to the inner cavity of the upper fixed box (71). A push shaft (73) is fixedly mounted on one end of the movable plate (72) close to the connecting pipe (44).

9. The SMT circuit board reflow soldering AOI inspection device according to claim 8, characterized in that: The push shaft (73) is slidably connected in the connecting pipe (44), and the top end of the fixing box (71) is communicated with the bottom end of the fixing ring (61), and the two are connected by a hose.

10. The detection method of the SMT circuit board reflow soldering seam AOI detection device according to any one of claims 1 to 9, characterized in that: The detection method comprises the following steps: The circuit board is placed on the conveyor belt (23), and the motor (25) drives the conveyor roller (24) to rotate, thereby causing the conveyor belt (23) to drive the circuit board to move until it extends out of the conveyor belt (23). During this process, the transmission belt (22) transmits power to the lead screw (43), thereby driving the lead screw (43) to rotate. Through the engagement 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) can be pushed into the connecting pipe (44); At this time, the hydraulic oil pushes the sliding shaft (33) outward, thereby making the clamping frame (34) close to the circuit board, so that the circuit board conveyed from the conveyor belt (23) enters between the two clamping frames (34). In this process, the hydraulic oil in the connecting pipe (44) simultaneously pushes the sliding shaft (33) and the pushing shaft (73), and the pushing shaft (73) drives the movable 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 to the air pipe (63) through the fixed ring (61), and then spraying it from the air pipe (63) on the upper and lower sides of the circuit board to clean the dust on the circuit board; When the roller (52) contacts the circuit board, the conveyor belt (23) stops moving. At this time, the camera built into the AOI detection body (1) takes a picture of the weld of the circuit board for comparison and detection. After the detection is completed, the motor (25) is started again. At this time, 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, thereby reaching the opening pressure of the pressure pipe (45), so that the hydraulic oil enters the pressure pipe (45) and pushes the rack (46) to move, thereby driving the gear ring (47) to rotate 180 degrees, driving the clamping frame (34) and the circuit board to rotate 180 degrees, and taking pictures of the other side of the circuit board for detection; After the test is completed, the motor (25) is reversed, and the motor (51) is started to drive the roller (52) to rotate, and the circuit board is transported to the conveyor belt (23), and is transported away by the conveyor belt (23). During this process, the screw (43) is reversed, and the push plate (42) is reset to withdraw the hydraulic oil and reset the device.

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