A device for detecting solder joint omission of vias on a printed circuit board

Abstract

The invention discloses a device for detecting leaky solder joints of through-hole solder joints of a printed circuit board, comprising a detection movable platform and a detector. A conveyor frame is arranged on the top of the detection movable platform, a conveyor belt is rotatably arranged on the inner side of the conveyor frame, a connecting plate is arranged on the rear side of the detection movable platform, an automatic feeding mechanism is arranged on the left end of the detection movable platform, a telescopic rod and a second electric push rod are arranged on the inner side of the conveyor frame, the extended end of the telescopic rod is hinged with a guide plate, the telescopic rod is rotatably connected to the conveyor frame, the extended end of the second electric push rod is fixedly connected to the guide plate on an adjacent side, the bottom of the telescopic rod and the bottom of the guide plate are both slidably connected to the surface of the conveyor belt, and a controller is arranged on the front side surface of the detection movable platform. Through the coordinated use of the second electric push rod, the guide plate, the scale line, the telescopic rod and the automatic feeding mechanism, the staff does not need to place all the circuit boards to be detected on the conveyor belt one by one, thereby greatly reducing the workload, saving time and labor, and having a high degree of automation.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board detection devices, and in particular to a through-hole solder joint missing solder detection device for printed circuit boards. Background Art

[0002] Printed circuit boards generally refer to circuit boards. The names of circuit boards include: ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, circuit boards, PCB boards, aluminum substrates, high-frequency boards, thick copper boards, impedance boards, PCBs, ultra-thin circuit boards, ultra-thin circuit boards, printed (copper etching technology) circuit boards, etc. Circuit boards miniaturize and visualize circuits, and play an important role in the mass production of fixed circuits and the optimization of electrical appliance layouts. One of the most serious problems in printed circuit board soldering is missing solder and unblocked solder holes by solder. This problem will cause serious problems in product quality and even huge economic losses. The research on automatic detection systems for printed circuit boards in China began around the mid-1990s. Since manual inspection has a high labor intensity, the eyes are prone to fatigue, and the missed inspection rate is very high. Moreover, as electronic products develop towards miniaturization and digitization, printed circuit boards also develop towards high density and high precision. Using the method of manual inspection is basically impossible to achieve.

[0003] There is also a detection method called AOI image inspection, which takes pictures of solder joints through a camera to inspect the shape of solder joints.

[0004] The full Chinese name of AOI (abbreviation of Automated Optical Inspection) is Automatic Optical Inspection, which is a device based on optical principles to detect common defects encountered in welding production. When automatically detecting, the machine automatically scans the PCB through a camera, collects images, compares the tested solder joints with the qualified parameters in the database, and through image processing, checks for defects on the PCB and displays / marks the defects through a display or automatic marking for maintenance personnel to repair.

[0005] When AOI detects circuit boards on the assembly line, workers need to place all the circuit boards to be detected one by one on the conveying mechanism. When the number of circuit boards is large, the workload is greatly increased, which is time-consuming and laborious; and when the circuit boards to be detected are placed on the conveying mechanism, it cannot be guaranteed that they are in the exact middle position of the conveying mechanism every time, which will cause the detection device to detect incompletely or even skip the circuit boards here, resulting in missed detection and affecting subsequent processes. Therefore, we design a through-hole solder joint missing solder detection device for printed circuit boards to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a through-hole solder joint missing solder detection device for printed circuit boards to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A printed circuit board via solder joint open circuit detection device, comprising a detection mobile platform and a detector. On the front and rear sides of the top of the detection mobile platform, conveyor racks are symmetrically arranged. At both the left and right ends between the two conveyor racks, rotating shafts are rotatably arranged. The two rotating shafts are connected by a conveyor belt. The front end of the rotating shaft on the left side penetrates through the conveyor rack and is connected with a pulley. On the front surface of the detection mobile platform, a first motor is fixedly arranged. The output shaft of the first motor is connected with the pulley through a belt. On the rear side surface of the detection mobile platform, there are two connecting plates. The top of the front side surface of the connecting plate is fixedly connected with the rear side surface of the detector. The detector is located directly above the top surface of the detection mobile platform. An automatic feeding mechanism is arranged at the left end of the detection mobile platform. On the opposite side surfaces of the two conveyor racks, telescopic rods are symmetrically arranged. The extended ends of the two telescopic rods are each hinged with a guide plate. The telescopic rod is rotatably connected with the conveyor rack. Electric push rods II are symmetrically arranged inside the conveyor rack. The extended ends of the electric push rods II are fixedly connected with the guide plate on the adjacent side. The number of the electric push rods II is four. The bottom of the telescopic rod and the bottom of the guide plate are each slidably connected with the surface of the conveyor belt. A controller is arranged on the front surface of the detection mobile platform.

[0009] The automatic feeding mechanism includes a bearing plate, support plates, a top frame, a moving block, an electric push rod I, a connecting block, a suction cup and a driving component. On the top of the left outer wall of the detection mobile platform, a bearing plate is fixedly connected. On the front and rear sides of the top of the bearing plate, support plates are symmetrically arranged. The top of the support plate is fixedly connected with the top frame. Inside the top frame, the moving block is slidably arranged through the driving component. At the front and rear ends of the bottom of the moving block, electric push rods I are symmetrically arranged. The extended ends of the electric push rods I are vertically downward and fixedly provided with connecting blocks. At the bottom of the connecting block, a suction cup is arranged. On the right side surface of the electric push rod I, a piston cylinder is fixedly arranged. Inside the piston cylinder, a piston plate slidably matched with it is arranged. At the top of the piston plate, a vertical rod is connected. The other end of the vertical rod extends out of the piston cylinder and is connected with an abutting plate. The vertical rod is slidably connected with the piston cylinder. On the left and right sides of the vertical rod, springs are symmetrically arranged. The top end of the spring is fixedly connected with the inner top wall of the piston cylinder, and the bottom end is fixedly connected with the top surface of the piston plate. On the right end of the top of the piston cylinder, a vertical plate is fixedly arranged. On the right side surface of the vertical plate, a second motor is fixedly arranged. The output shaft of the second motor penetrates through the vertical plate and is connected with a cam. The arc side surface of the cam abuts against the bottom surface of the abutting plate. On the left side of the bottom of the piston cylinder, a one-way valve I is arranged. The one-way valve I is connected with an air pipe. The other end of the air pipe penetrates through the connecting block and is communicated with the inside of the suction cup. On the right side of the bottom of the piston cylinder, a one-way valve II is arranged. The one-way valve II is connected with a pipe orifice.

[0010] As a preferred embodiment of the present invention: A cavity is provided inside the detection mobile station. Through holes are provided at the four corners of the inner bottom wall of the cavity. A lifting plate is slidably provided inside the cavity. Lifting columns are provided at the four corners of the bottom of the lifting plate. Moving wheels are provided at the bottoms of the lifting columns. The lifting columns are slidably connected to the inner wall of the cavity and the inner wall of the through holes. A plurality of hydraulic cylinders are provided on the inner top wall of the cavity. The output ends of the hydraulic cylinders are vertically downward and fixedly connected to the top of the lifting plate.

[0011] As a further preferred embodiment of the present invention: The driving assembly includes a motor three, a threaded rod, and a sliding rod. The threaded rod is rotatably connected between the left and right side walls inside the top frame. The threaded rod threadedly penetrates through the moving block. A motor three is provided on the outer wall of the left side of the top frame. The output shaft of the motor three extends to the inside of the top frame and is fixedly connected to the left end of the threaded rod. The sliding rods are symmetrically provided on both sides of the threaded rod. The two ends of the sliding rod are fixedly connected to the inner side wall of the top frame. The sliding rod slidably penetrates through the moving block.

[0012] As a further preferred embodiment of the present invention: A collection box is provided on the right side of the detection mobile station. The top of the collection box is open.

[0013] As a further preferred embodiment of the present invention: Scale lines are provided on the surface of the conveyor belt. The scale lines are perpendicular to the length direction of the guide plate.

[0014] As a further preferred embodiment of the present invention: The two guide plates are arranged parallel to each other. The extending direction of the telescopic rod forms an angle of 45 degrees with the conveying direction of the conveyor belt.

[0015] As a further preferred embodiment of the present invention: The cross-sectional dimension of the lifting plate in the horizontal direction is equal to the horizontal dimension of the cavity.

[0016] As a further preferred embodiment of the present invention: The diameter of the lifting column is equal to the diameter of the through hole. The diameter of the moving wheel is smaller than the diameter of the through hole.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] Through the combined use of the electric push rod two, the guide plate, the scale line, the telescopic rod, and the automatic feeding mechanism, the staff does not need to place all the circuit boards to be detected one by one on the conveyor belt, which greatly reduces the workload, saves time and effort, and has a high degree of automation. According to the size of the circuit board to be detected, the staff adjusts the distance between the two guide plates to a suitable position to ensure that the circuit board to be detected is always in the middle of the conveyor belt each time, avoiding incomplete detection by the detection device or even skipping the circuit board here, resulting in missed detection and affecting subsequent processes.

[0019] Through the combined use of moving wheels, through holes, cavities, hydraulic cylinders, lifting plates, and lifting columns, the hydraulic cylinder can drive the moving wheels to extend or retract. When the moving wheels extend, it is convenient for the device body to move; when the moving wheels retract, it is detected that the bottom surface of the moving platform contacts the ground, and the device body cannot move and can maintain stability. Description of the Drawings

[0020] Figure 1 It is the front view of the overall structure of the present invention;

[0021] Figure 2 It is the schematic diagram of the internal structure of the detection moving platform in the present invention;

[0022] Figure 3 It is the enlarged view of the partial structure in the present invention;

[0023] Figure 4 It is the left view of the moving block in the present invention;

[0024] Figure 5 It is the top view of the conveyor belt in the present invention;

[0025] Figure 6 It is the schematic diagram of the structure of the driving component in the present invention;

[0026] Wherein: 1 - detection moving platform, 2 - motor one, 3 - belt, 4 - belt pulley, 5 - bearing plate, 6 - support plate, 7 - motor three, 8 - top frame, 9 - detector, 10 - connecting plate, 11 - conveying frame, 12 - collection box, 13 - moving wheel, 14 - through hole, 15 - cavity, 16 - hydraulic cylinder, 17 - lifting plate, 18 - lifting column, 19 - moving block, 20 - sliding rod, 21 - threaded rod, 22 - electric push rod one, 23 - connecting block, 24 - suction cup, 25 - air pipe, 26 - piston cylinder, 27 - cam, 28 - vertical plate, 29 - motor two, 30 - piston plate, 31 - electric push rod two, 32 - conveyor belt, 33 - guide plate, 34 - scale line, 35 - telescopic rod, 36 - spring, 37 - abutting plate. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Please refer to Figures 1-6 , in an embodiment of the present invention, a printed circuit board via solder joint open circuit detection device includes a detection mobile stage 1 and a detector 9. On the front and rear sides of the top of the detection mobile stage 1, transfer racks 11 are symmetrically arranged. Rotating shafts are arranged at both the left and right ends between the two transfer racks 11, and the two rotating shafts are drivingly connected by a conveyor belt 32. The front end of the rotating shaft on the left side penetrates through the transfer rack 11 and is connected to a pulley 4. A first motor 2 is fixedly arranged on the front side surface of the detection mobile stage 1, and the output shaft of the first motor 2 is drivingly connected to the pulley 4 through a belt 3. Two connecting plates 10 are arranged on the rear side surface of the detection mobile stage 1. The top of the front side surface of the connecting plate 10 is fixedly connected to the rear side surface of the detector 9. The detector 9 is located directly above the top surface of the detection mobile stage 1. An automatic feeding mechanism is arranged at the left end of the detection mobile stage 1. Telescopic rods 35 are symmetrically arranged on the opposite side surfaces of the two transfer racks 11. The extended ends of the two telescopic rods 35 are both hinged to a guide plate 33. The telescopic rod 35 is rotatably connected to the transfer rack 11. Electric push rods two 31 are symmetrically arranged inside the transfer rack 11. The extended ends of the electric push rods two 31 are fixedly connected to the guide plate 33 on the adjacent side. The number of the electric push rods two 31 is four. The bottom of the telescopic rod 35 and the bottom of the guide plate 33 are both slidably connected to the surface of the conveyor belt 32. A controller is arranged on the front side surface of the detection mobile stage 1.

[0031] The automatic feeding mechanism includes a bearing plate 5, support plates 6, a top frame 8, a moving block 19, a first electric push rod 22, a connecting block 23, a suction cup 24 and a driving assembly. A bearing plate 5 is fixedly connected to the top of the outer wall on the left side of the detection moving table 1. Support plates 6 are symmetrically arranged on the front and rear sides of the top of the bearing plate 5. A circuit board to be detected is placed between the two support plates 6. The top of the support plate 5 is fixedly connected to the top frame 8. A moving block 19 is slidably arranged in the top frame 8 through the driving assembly. First electric push rods 22 are symmetrically arranged at the front and rear ends of the bottom of the moving block 19. The extending ends of the first electric push rods 22 are vertically downward and fixedly provided with a connecting block 23. A suction cup 24 is arranged at the bottom of the connecting block 23. A piston cylinder 26 is fixedly arranged on the right side surface of the first electric push rod 22. A piston plate 30 adapted to it is slidably arranged in the piston cylinder 26. A vertical rod is connected to the top of the piston plate 30. The other end of the vertical rod extends out of the piston cylinder 26 and is connected to an abutting plate 37. The vertical rod is slidably connected to the piston cylinder 26. Springs 36 are symmetrically arranged on the left and right sides of the vertical rod. The top ends of the springs 36 are fixedly connected to the inner top wall of the piston cylinder 26, and the bottom ends are fixedly connected to the top surface of the piston plate 30. A vertical plate 28 is fixedly arranged at the right end of the top of the piston cylinder 26. A second motor 29 is fixedly arranged on the right side surface of the vertical plate 28. The output shaft of the second motor 29 penetrates through the vertical plate 28 and is connected to a cam 27. The arc side surface of the cam 27 abuts against the bottom surface of the abutting plate 37. A one-way valve one is arranged on the left side of the bottom of the piston cylinder 26. The one-way valve one is connected to an air pipe 25. The other end of the air pipe 25 penetrates through the connecting block 23 and is communicated with the inside of the suction cup 24. A one-way valve two is arranged on the right side of the bottom of the piston cylinder 26. The one-way valve two is connected to a pipe orifice. The one-way valve one controls the gas to only go out and not come in, and the one-way valve two controls the gas to only come in and not go out.

[0032] The driving assembly includes a third motor 7, a threaded rod 21 and a slide rod 20. The threaded rod 21 is rotatably connected between the left and right side walls inside the top frame 8. The threaded rod 21 threadedly penetrates through the moving block 19. A third motor 7 is arranged on the left outer wall of the top frame 8. The output shaft of the third motor 7 extends to the inside of the top frame 8 and is fixedly connected to the left end of the threaded rod 21. Slide rods 20 are symmetrically arranged on both sides of the threaded rod 21. The two ends of the slide rod 20 are fixedly connected to the inner side wall of the top frame 8. The slide rod 20 slidably penetrates through the moving block 19.

[0033] The interior of the detection mobile station 1 is provided with a cavity 15. Through holes 14 are opened at the four corners of the inner bottom wall of the cavity 15. A lifting plate 17 is slidably arranged in the cavity 15. The cross-sectional dimension of the lifting plate 17 in the horizontal direction is equal to the dimension of the cavity 15 in the horizontal direction. Lifting columns 18 are arranged at the four corners of the bottom of the lifting plate 17. Moving wheels 13 are arranged at the bottoms of the lifting columns 18. The lifting columns 18 are slidably connected to the inner wall of the cavity 15 and are slidably connected to the inner wall of the through holes 14. The diameter of the lifting columns 18 is equal to the diameter of the through holes 14. The diameter of the moving wheels 13 is smaller than the diameter of the through holes 14. A plurality of hydraulic cylinders 16 are arranged on the inner top wall of the cavity 15. The output ends of the hydraulic cylinders 16 are vertically downward and fixedly connected to the top of the lifting plate 17. When the hydraulic cylinders 16 extend, they push the lifting plate 17 and the lifting columns 18 downward until the moving wheels 13 extend out of the through holes 14 and abut against the bottom surface, finally lifting the entire detection mobile station 1, facilitating the movement of the entire device. During use, the lifting columns 18 can be controlled to move upward by the hydraulic cylinders 16, driving the moving wheels 13 to retract into the through holes 14. At this time, the bottom surface of the detection mobile station 1 contacts the ground, and the device body cannot move and can maintain stability.

[0034] A collection box 12 is arranged on the right side surface of the detection mobile station 1. The top of the collection box 12 is open. The collection box 12 is used to collect the circuit boards after detection.

[0035] Scale lines 34 are arranged on the surface of the conveyor belt 32. The scale lines 34 are perpendicular to the length direction of the guide plate 33. During use, first control the scale lines 34 to move to the bottom of the guide plate 33. When the staff starts the second electric push rod 31 to control the movement of the guide plate 33, they can quickly know the distance between the two guide plates 33 according to the scale lines 34, and thus can be more conveniently applicable to printed boards of different sizes, improving the practicability of the device.

[0036] The two guide plates 33 are arranged parallel to each other. The extending direction of the telescopic rod 35 forms an angle of 45 degrees with the conveying direction of the conveyor belt 32. This design is to facilitate a better guiding effect on the circuit board to be detected to ensure its position in the middle of the conveyor belt.

[0037] Working principle: Start motor 1-2. Motor 1-2 drives pulley 4 to rotate through belt 3, and then drives conveyor belt 32 to rotate through the rotating shaft for conveying work. The staff places all the circuit boards to be detected between two support plates 5. Start motor 3-7. Motor 3-7 drives threaded rod 21 to rotate. Under the action of threaded connection, the movement block 19 can be controlled to move left and right, that is, the electric push rod 1-22 and the suction cup 24 at its bottom can be controlled to move left and right. At the same time, control the telescopic movement of electric push rod 1-22, that is, the up and down movement of suction cup 24 can be controlled. When controlling the suction cup 24 to move downward and contact the surface of the circuit board to produce a certain extrusion, the suction cup 24 deforms, the air pressure inside the suction cup 24 becomes smaller, and the circuit board is sucked. Then control the suction cup 24 to move upward and drive the circuit board to rise. Then control the suction cup 24 to move to the upper left of the conveyor belt 32. Then start motor 2-29. Motor 2-29 drives cam 27 to rotate. Due to the elastic force of spring 36, the abutting plate 37 always abuts against the surface of cam 27. Therefore, when cam 27 rotates, the abutting plate 37 continuously makes up and down reciprocating movements, and then drives the piston plate 30 to move up and down continuously. Also, since check valve 1 controls the gas to only go out and not in, and check valve 2 controls the gas to only go in and not out, the gas can be discharged into the suction cup 24 through the air pipe 25, so that the air pressure inside the suction cup 24 is restored. At this time, the circuit board can fall onto the surface of the conveyor belt 32 for conveying work. Repeat the above steps to realize automatic feeding operation, without placing all the circuit boards to be detected one by one on the conveying mechanism, which greatly reduces the workload, saves time and effort, and has a high degree of automation. According to the size of the circuit board to be detected, the staff adjusts the distance between the two guide plates 33 to a suitable position to ensure that the circuit board to be detected is always in the middle of the conveyor belt 32 each time, so as to avoid incomplete detection by the detection device or even skipping the circuit board here, resulting in missed detection and affecting the subsequent process.

[0038] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0039] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A through-hole solder joint inspection device for a printed circuit board, comprising an inspection mobile table (1) and a detector (9); characterized in that: On the front and rear sides of the top of the detection mobile station (1), there are symmetrically arranged conveyor racks (11). At both left and right ends between the two conveyor racks (11), there are rotatably arranged rotating shafts. Between the two rotating shafts, there is a belt transmission connection through a conveyor belt (32). The front end of the rotating shaft on the left side penetrates through the conveyor rack (11) and is connected with a pulley (4). On the front surface of the detection mobile station (1), there is a fixed motor one (2). The output shaft of the motor one (2) is in belt transmission connection with the pulley (4) through a belt (3). On the rear side of the detection mobile station (1), there are two connecting plates (10). The top of the front side of the connecting plate (10) is fixedly connected with the rear side of the detector (9). The detector (9) is located directly above the top surface of the detection mobile station (1). At the left end of the detection mobile station (1), there is an automatic feeding mechanism. On the symmetrically arranged opposite sides of the two conveyor racks (11), there are telescopic rods (35). The extended ends of the two telescopic rods (35) are both hinged with guide plates (33). The telescopic rods (35) are rotatably connected with the conveyor racks (11). Inside the conveyor racks (11), there are symmetrically arranged electric push rods two (31). The extended ends of the electric push rods two (31) are fixedly connected with the guide plates (33) on the adjacent side. The number of the electric push rods two (31) is four. The bottom of the telescopic rod (35) and the bottom of the guide plate (33) are both slidably connected with the surface of the conveyor belt (32). On the front surface of the detection mobile station (1), there is a controller; The automatic feeding mechanism includes a bearing plate (5), a support plate (6), a top frame (8), a moving block (19), a first electric push rod (22), a connecting block (23), a suction cup (24) and a driving assembly. A bearing plate (5) is fixedly connected to the top of the outer wall on the left side of the detection moving table (1). Support plates (6) are symmetrically arranged on the front and rear sides of the top of the bearing plate (5). The top of the support plate (6) is fixedly connected to the top frame (8). A moving block (19) is slidably arranged in the top frame (8) through the driving assembly. First electric push rods (22) are symmetrically arranged at the front and rear ends of the bottom of the moving block (19). The extending ends of the first electric push rods (22) are vertically downward and fixedly provided with a connecting block (23). A suction cup (24) is arranged at the bottom of the connecting block (23). A piston cylinder (26) is fixedly arranged on the right side surface of the first electric push rod (22). A piston plate (30) adapted to it is slidably arranged in the piston cylinder (26). A vertical rod is connected to the top of the piston plate (30). The other end of the vertical rod extends out of the piston cylinder (26) and is connected to an abutting plate (37). The vertical rod is slidably connected to the piston cylinder (26). Springs (36) are symmetrically arranged on the left and right sides of the vertical rod. The top ends of the springs (36) are fixedly connected to the inner top wall of the piston cylinder (26), and the bottom ends are fixedly connected to the top surface of the piston plate (30). A vertical plate (28) is fixedly arranged at the right end of the top of the piston cylinder (26). A second motor (29) is fixedly arranged on the right side surface of the vertical plate (28). The output shaft of the second motor (29) penetrates through the vertical plate (28) and is connected to a cam (27). The arc side surface of the cam (27) abuts against the bottom surface of the abutting plate (37). A one-way valve one is arranged on the left side of the bottom of the piston cylinder (26). The one-way valve one is connected to an air pipe (25). The other end of the air pipe (25) penetrates through the connecting block (23) and is communicated with the inside of the suction cup (24). A one-way valve two is arranged on the right side of the bottom of the piston cylinder (26). The one-way valve two is connected to a pipe orifice; Scale lines (34) are arranged on the surface of the conveyor belt (32), and the scale lines (34) are perpendicular to the length direction of the guide plate (33); The two guide plates (33) are arranged parallel to each other, and the extending direction of the telescopic rod (35) forms an angle of forty-five degrees with the conveying direction of the conveyor belt (32); The horizontal cross-sectional dimension of the lifting plate (17) is equal to the horizontal dimension of the cavity (15).

2. The through-hole solder joint inspection device for printed circuit boards according to claim 1, characterized in that: A cavity (15) is arranged inside the detection moving table (1). Through holes (14) are opened at the four corners of the inner bottom wall of the cavity (15). A lifting plate (17) is slidably arranged in the cavity (15). Lifting columns (18) are arranged at the four corners of the bottom of the lifting plate (17). Moving wheels (13) are arranged at the bottoms of the lifting columns (18). The lifting columns (18) are slidably connected to the inner wall of the cavity (15) and the inner wall of the through holes (14). A plurality of hydraulic cylinders (16) are arranged on the inner top wall of the cavity (15). The output ends of the hydraulic cylinders (16) are vertically downward and fixedly connected to the top of the lifting plate (17).

3. The solder joint void detection device for printed circuit board vias according to claim 1, characterized in that: The driving assembly includes a third motor (7), a threaded rod (21) and a sliding rod (20). The threaded rod (21) is rotatably connected between the left and right side walls inside the top frame (8). The threaded rod (21) threadedly penetrates through the moving block (19). A third motor (7) is provided on the outer wall of the left side of the top frame (8). The output shaft of the third motor (7) extends to the inside of the top frame (8) and is fixedly connected to the left end of the threaded rod (21). Sliding rods (20) are symmetrically provided on both sides of the threaded rod (21). Both ends of the sliding rod (20) are fixedly connected to the inner side wall of the top frame (8). The sliding rod (20) slidably penetrates through the moving block (19).

4. A printed circuit board via solder joint solder omission detection device according to claim 3, characterized in that: A collection box (12) is provided on the right side surface of the detection mobile platform (1). The top of the collection box (12) is open.

5. The solder joint inspection device for via holes on a printed circuit board according to claim 2, wherein: The diameter of the lifting column (18) is equal to the diameter of the through hole (14). The diameter of the moving wheel (13) is smaller than the diameter of the through hole (14).

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