A method and system for detecting the quality of wave-soldering

Abstract

The application discloses a wave-soldering quality detection method and system, and relates to the technical field of optical visual detection.The system comprises a visual detection machine body, a movable frame capable of relative movement in the machine body, a high-resolution camera and an auxiliary illuminating lamp arranged on the top of the movable frame, two groups of rotating seats rotatably arranged on the inner side of the movable frame, a clamping plate, an extension plate, a gasket and a clamping mechanism arranged on the rotating seat, and a damping mechanism.The clamping plate is retracted into the rotating seat with the increase of the clamping force, and drives the gasket to separate from the circuit board during clamping.The damping mechanism synchronously adjusts the stress of the supporting rod of the clamping mechanism, and releases the restriction of the rotating mechanism.The detection method comprises the following steps: placing the circuit board on the gasket, retracting the movable frame to make the clamping plate clamp the circuit board, rotating the rotating seat slowly after the clamping is completed, and cooperating the camera with the auxiliary lamp to shoot and detect the soldering points of the circuit board, so that the circuit board abrasion and shielding can be avoided, and complete detection of both sides can be realized.

Description

Technical Field

[0001] This invention relates to optical vision inspection technology, specifically a wave soldering quality inspection method and system. Background Technology

[0002] As is generally known, mass production lines for circuit boards are typically equipped with visual inspection equipment to inspect the circuit boards after production. This equipment uses a high-resolution camera to capture images of the circuit board surface and combines these images with algorithms to compare "standard solder joint images" with "actual solder joint images." It automatically identifies surface defects such as dry solder joints, bridging of short circuits between adjacent solder joints, missing solder joints, and solder buildup, thus performing the first step of inspection in the production of circuit boards.

[0003] The shortcomings of existing technologies are that, currently, the visual inspection of circuit boards generally relies on optical aids to illuminate the circuit board, place it on a fixture for clamping, inspect one side, and then flip it over for inspection. This method requires manual flipping of the circuit board, or the use of a flip-up clamping mechanism. When clamping the circuit board, in order to facilitate the placement of the circuit board and to provide a better clamping effect, the clamping mechanism usually has a long and fixed-length pad at the bottom of the circuit board. The position of the pad will obstruct the bottom of the circuit board by a large distance after flipping, and it cannot be retracted, which affects the photographic inspection and has poor practicality. Summary of the Invention

[0004] The purpose of this invention is to provide a wave soldering quality inspection method and system to address the aforementioned shortcomings in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: comprising: a visual inspection body, wherein the visual inspection body is provided with mutually symmetrical and relatively movable frames, and a high-resolution camera and auxiliary lighting are mounted on the top of the visual inspection body; and further comprising:

[0006] Two sets of rotating seats are rotatably mounted inside the movable frame. The side of the rotating seat connected to the movable frame is the rotating side, and the other side of the rotating seat is the clamping side.

[0007] A clamping plate, which is movably inserted into the middle of the clamping side of the rotary seat;

[0008] A telescopic plate, which is movably inserted into the bottom of the clamping side;

[0009] Gasket, the gasket being movably inserted into the surface of the telescopic plate;

[0010] The clamping mechanism is connected to a clamping plate. When the clamping plate is pressing the two ends of the circuit board, the clamping plate retracts into the rotating seat 3 as the clamping force increases. This passively drives the pad to retract into the telescopic plate and separate from the circuit board. At the same time, when the pad and the telescopic plate retract, the damping mechanism is used to adaptively adjust the force on the two ends of the support rod in the clamping mechanism and simultaneously release the restriction on the rotation mechanism. After clamping the two ends of the circuit board, the circuit board is slowly rotated for detection.

[0011] As a further description of the above technical solution: the clamping mechanism includes a clamping plate, the bottom of which is fixedly connected to a rod sleeve, which is movably inserted into a rotating seat. The bottom end of the rod sleeve inserted into the rotating seat is fixedly connected to the middle of a support rod. The lower support rod is L-shaped and rotatably connected to one end of a set of rotating rods via a bearing at its end. The other end of the rotating rod is rotatably connected to one side of the bottom of a pad. The other side of the bottom of the pad is movably connected to a sliding groove via a rotating column. The sliding groove is opened in another set of rotating rods. The bottom end of the rotating rod is rotatably connected to the bottom of a telescopic plate via a bearing. The support rod is slidably connected in a movable groove, which is opened on the surface of the telescopic plate.

[0012] As a further description of the above technical solution: the clamping mechanism also includes an inner rod that is movably inserted into the sleeve. The top end of the inner rod is movably inserted into the sleeve via a return spring, and the other end of the inner rod is rotatably connected to the bottom of the fixed ring via a bearing.

[0013] As a further description of the above technical solution: the damping mechanism includes a slide rail opened on the inner side wall of the top of the rotating seat, the top end of the support rod provided above the bottom end of the rod sleeve is slidably connected to the slide rail, and one end of the telescopic rod is fixedly connected to one side of the top end of the support rod. The other end of the telescopic rod is movably inserted into the telescopic sleeve, and one-way rotating balls are provided on both sides of the end of the telescopic rod inserted into the telescopic sleeve.

[0014] As a further description of the above technical solution: the damping mechanism also includes a slider fixedly connected to the other end of the telescopic sleeve. The slider is slidably connected inside the slide rail. Elastic balls are provided on both sides of the slider. The slide rail is opened with a large opening size and a small closing size, and the size changes from the middle position.

[0015] As a further description of the above technical solution: the rotating mechanism includes a turntable fixedly installed in the middle of the rotating side of the turntable. A fixed ring is rotatably inserted into the turntable. One end of the fixed ring is fixedly connected to the inner side of the movable frame. The other end of the fixed ring is inserted into the turntable and fixedly connected to a limiting gear. A collar is movably inserted into the limiting gear. A retaining tooth is provided on the outer circumference of the collar. The retaining tooth engages with a retaining groove on the inner side of the limiting gear. The collar is slidably sleeved on the bottom end of the inner rod. A spring sleeve connecting collar is provided on the circumference of the end of the inner rod inserted into the fixed ring.

[0016] As a further description of the above technical solution: the rotating mechanism also includes a vertical rod fixedly connected to the bottom of the slider, and the bottom end of the vertical rod is provided with a locking tooth, which is engaged in a slot on the outer periphery of the limiting gear.

[0017] As a further description of the above technical solution: the one-way rotating ball is installed using a one-way bearing, so that the one-way rotating ball can only rotate in the direction of pulling the telescopic rod outward from the telescopic sleeve. When the telescopic rod is inserted into the telescopic sleeve, the one-way rotating ball cannot rotate and can only slide against the inner side wall of the telescopic sleeve.

[0018] As a further description of the above technical solution: the outer and inner sides of the limiting gear are provided with multiple sets of tooth grooves, which provide dual limiting for the limiting gear.

[0019] As a further description of the above technical solution: the detection method of this wave soldering quality inspection system is as follows:

[0020] S1: Place the circuit board on the pad set at the bottom inside the turntable and turn on the optical auxiliary light;

[0021] S2: The movable frames retract inwards, and the circuit board is clamped by the clamping plates contacting the edge of the circuit board;

[0022] S3: After the clamping plate holds the circuit board to the set position, start the electric turntable to slowly rotate the turntable;

[0023] S4: As the circuit board slowly rotates, the auxiliary light and high-resolution camera mounted on top of the vision inspection machine are used to photograph and inspect the solder joints on the surface of the circuit board.

[0024] In the above technical solution, the wave soldering quality inspection method and system provided by the present invention have the following beneficial effects:

[0025] 1. Eliminate detection obstruction: After the telescopic plate retracts, only a short distance remains on the bottom surface of the circuit board. This ensures that the circuit board surface is not obstructed and that the clamping of the circuit board is not affected. Combined with the rotation of the circuit board and the illumination of the circuit board by the optical auxiliary light, the circuit board can be completely photographed and inspected on both sides. This avoids missed inspections due to the obstruction of the bottom position of the circuit board caused by the telescopic plate being too long and unable to extend.

[0026] 2. Avoid circuit board wear: First, support the circuit board with a pad. When clamping, the pad retracts first to separate from the circuit board, and then the telescopic plate retracts to prevent the telescopic plate from directly contacting the circuit board and causing wear due to lateral pulling, thus protecting the appearance and function of the circuit board.

[0027] 3. Ensure clamping stability: The damping mechanism can adaptively adjust the force on both ends of the clamping mechanism support rod according to the resistance changes at different stages of the clamping process, prevent the support rod from tilting, and ensure that the clamping plate stably clamps the circuit board.

[0028] 4. Achieve safe rotation detection: The rotation mechanism uses double limit switches. The inner and outer teeth of the limit gears ensure that the circuit board is fixed in position when not in detection. After the circuit board is clamped in place, the limit is released simultaneously, allowing the circuit board to rotate slowly and stably, and complete accurate detection in conjunction with the camera. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0030] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention;

[0031] Figure 2 A schematic diagram showing the progressive movement states of the gasket and telescopic plate provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the internal structure of the rotary seat provided in an embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the connection between the support rod and the telescopic plate provided in an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the support rod provided in an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the slide rail provided in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram of the structure of the telescopic rod and telescopic sleeve provided in an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the rod sleeve provided in an embodiment of the present invention;

[0038] Figure 9 This is a schematic diagram of the structure of the limiting gear provided in an embodiment of the present invention;

[0039] Figure 10 This is a schematic diagram illustrating the combination and disassembly of the turntable, fixed ring, and limiting gear provided in an embodiment of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Vision inspection machine body; 2-Modible frame; 3-Rotating seat; 4-Telescopic plate; 5-Shim; 6-Clamping plate; 7-Modular groove; 8-Vertical rod; 9-Clamping tooth; 10-Spring sleeve; 11-Inner rod; 12-Bearing; 13-Collar ring; 14-Rod sleeve; 15-Slide rail; 16-Support rod; 17-Slider; 18-Elastic ball; 19-Telescopic sleeve; 20-Telescopic rod; 21-Reset spring; 22-Rotating rod; 23-Slide groove; 24-Rotating column; 25-Limit gear; 26-Fixing ring; 27-Electric turntable; 28-One-way rotating ball. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] Please see Figures 1-10 This invention provides a method and system for wave soldering quality inspection, comprising: a vision inspection unit 1, wherein the vision inspection unit 1 has symmetrically arranged movable frames 2 that can move relative to each other, and a high-resolution camera and auxiliary lighting are installed on the top of the vision inspection unit 1; and further comprising:

[0044] Two sets of rotating seats 3 are rotatably installed inside the movable frame 2. The side of the rotating seat 3 connected to the movable frame 2 is the rotating side, and the other side of the rotating seat 3 is the clamping side.

[0045] Clamping plate 6 is movably inserted into the middle of the clamping side of the rotary seat 3;

[0046] Telescopic plate 4 is movably inserted into the bottom of the clamping side;

[0047] Gasket 5 is movably inserted into the surface of telescopic plate 4;

[0048] The clamping mechanism is connected to the clamping plate 6. When the clamping plate 6 is pressing the two ends of the circuit board, the clamping plate 6 retracts into the rotating seat 3 as the clamping force increases. This passively drives the pad 5 to retract into the telescopic plate 4 and separate from the circuit board. At the same time, when the pad 5 and the telescopic plate 4 retract, the damping mechanism is used to adaptively adjust the force on both ends of the support rod 16 in the clamping mechanism and simultaneously release the restriction on the rotation mechanism. After clamping both ends of the circuit board, it is slowly rotated for testing.

[0049] In another embodiment of the present invention, the one-way ball 28 is installed using a one-way bearing 12, so that the one-way ball 28 can only rotate in the direction of pulling the telescopic rod 20 outward from the telescopic sleeve 19. When the telescopic rod 20 is inserted into the telescopic sleeve 19, the one-way ball 28 cannot rotate and can only slide against the inner side wall of the telescopic sleeve 19.

[0050] In another embodiment of the present invention, the limiting gear 25 is provided with multiple sets of tooth grooves on both the outer and inner sides for dual limiting of the limiting gear 25.

[0051] For mass production lines of circuit boards, optically assisted vision inspection equipment is generally configured to inspect the produced circuit boards. The circuit board surface is illuminated by an optical auxiliary lamp and then photographed by a high-resolution camera. The algorithm compares the "standard solder joint image" with the "actual solder joint image" to automatically identify surface defects and flaws such as dry solder joints, bridging of short circuits between adjacent solder joints, missing solder joints, and solder buildup. This is the first step in the inspection of the circuit board production.

[0052] In another embodiment of the present invention, preferably, the clamping mechanism includes a clamping plate 6, a rod sleeve 14 is fixedly connected to the bottom of the clamping plate 6, the rod sleeve 14 is movably inserted into the rotating seat 3, the bottom end of the rod sleeve 14 inserted into the rotating seat 3 is fixedly connected to the middle of the support rod 16, the lower support rod 16 is L-shaped and is rotatably connected to one end of a set of rotating rods 22 through a bearing 12 at its end, the other end of the rotating rod 22 is rotatably connected to one side of the bottom of the pad 5, the other side of the bottom of the pad 5 is movably connected to the sliding groove 23 through a rotating column 24, the sliding groove 23 is opened in another set of rotating rods 22, the bottom end of the rotating rod 22 is rotatably connected to the bottom of the telescopic plate 4 through a bearing 12, and the support rod 16 is slidably connected in the movable groove 7, the movable groove 7 is opened on the surface of the telescopic plate 4.

[0053] It should be noted that, as the L-shaped support rod 16 retracts backward with the clamping movement of the clamping plate 6, during this process, the support rod 16 will first slide inside the movable groove 7 on the surface of the telescopic plate 4. Only when the support rod 16 slides to the end of the movable groove 7 will it abut against the telescopic plate 4, causing the telescopic plate 4 to retract inward. This design is to first retract the pad 5 into the telescopic plate 4, which results in the movement trajectory of the clamping plate 6 being greater than that of the telescopic plate 4. Since the initial position of the clamping plate 6 needs to be between the clamping plate 4 and the rotating seat 3, when the telescopic plate 4 retracts, it will only retract into the rotating seat until it is attached to the edge of the plate. Figure 2 As shown in the last two state diagrams, the telescopic plate 4 will not retract completely into the rotating base but will protrude outward by a certain distance. This distance will only cover the lower edge of the circuit board. As is well known, there are no solder joints at the lower edge of the circuit board, so it will not affect the photographic inspection of the circuit board. The complete retraction of the telescopic plate mentioned throughout the text refers to the final retraction state of the telescopic plate, which is to retract the telescopic plate to this state, not to completely retract the telescopic plate into the rotating base. The final retraction state of the telescopic plate 4 ensures that the initial position of the clamping plate 6 is located between the telescopic plate 4 and the rotating base 3, and that the retraction of the clamping plate 6 can complete the retraction of the telescopic plate 4, so that the retraction of the clamping plate 6 and the telescopic plate 4 will not restrict each other.

[0054] In another embodiment of the present invention, the clamping mechanism further includes an inner rod 11 that is movably inserted into the rod sleeve 14. The top end of the inner rod 11 is movably inserted into the rod sleeve 14 via a return spring 21, and the other end of the inner rod 11 is rotatably connected to the bottom of the fixing ring 26 via a bearing 12.

[0055] The specific operation process for visual inspection of circuit boards is as follows:

[0056] S1: Place the circuit board on the pad 5 set at the bottom inside the turntable 3 and turn on the optical auxiliary light;

[0057] During this process, after opening the outer protective cover of the vision inspection machine body 1, the circuit board is placed on the telescopic plate 4 located at the bottom of the inner side of the rotating base 3. The surface of the telescopic plate 4 is provided with a retractable pad 5. The pad 5 is in direct contact with the circuit board, thereby separating the circuit board from the telescopic plate 4 at a certain distance. After clamping the circuit board, the pad 5 is first slid down in a vertical downward state to separate from the circuit board, and the circuit board is completely clamped by the clamping plate 6. Then the telescopic plate 4 is retracted laterally into the rotating base 3.

[0058] The advantage of this design is that after the circuit board is placed on the pad 5 and fixed, the pad 5 is slid down to separate from the circuit board. This prevents the circuit board from being placed directly on the surface of the telescopic plate 4 and then being pulled laterally while in contact with the circuit board during use. This prevents wear on the circuit board surface and affects the use of the circuit board.

[0059] Another fundamental point of the above benefits is that the telescopic plate 4 is designed to facilitate the placement of the circuit board. However, optical inspection of the circuit board requires shooting and inspection from both sides. If the telescopic plate 4, which is used to place the circuit board, is not retracted, the circuit board at the contact point of the telescopic plate 4 will be blocked by the telescopic plate 4, and the blocked circuit board cannot be photographed.

[0060] Based on the above, the purpose of setting the telescopic plate 4 and the pad 5 is to ensure that when the circuit board is rotated for shooting, the surface of the circuit board will not be blocked by the telescopic plate 4, and the telescopic plate 4 will not directly contact the circuit board and retract, thus avoiding damage to the circuit board caused by direct lateral friction between the telescopic plate 4 and the circuit board.

[0061] S2: The movable frame 2 is retracted inwards, and the circuit board is clamped by the clamping plate 6 contacting the edge of the circuit board;

[0062] After placing the circuit board, start the motor inside the movable frame 2 to bring the two sets of movable frames 2 closer together, thereby bringing the two ends of the circuit board into contact with the surface of the clamping plate 6. The clamping plate 6 then holds the circuit board in place, as shown in the attached figure. Figure 2The different motion states are shown from left to right. Process A1 represents the downward numerical movement of pad 5; process A2 represents the motion state of telescopic plate 4 after the motion state of pad 5 is completed.

[0063] The specific process is as follows: After the clamping plate 6 contacts both ends of the circuit board, due to the continuous inward contraction of the movable frame 2, the clamping plate 6 is pressed into the rotating seat 3 by the circuit board. This process is divided into two parts:

[0064] Part One is an appendix. Figure 2 In state A2, during this process, the clamping plate 6 inserts the bottom-connected rod sleeve 14 into the rotating seat 3. During the insertion of the rod sleeve 14, the inner rod 11, which is slidably inserted through the return spring 21, squeezes the return spring 21 and inserts into the rod sleeve 14. The bottom end of the rod sleeve 14 is inserted into the rotating seat 3. During this process, the lower support rod 16 connected to the bottom end of the rod sleeve 14 is rotatably connected to one end of a set of rotating rods 22 through the bearing 12. The other end of the rotating rod 22 is rotatably connected to one side of the bottom of the pad 5 through the bearing 12. The other side of the bottom of the pad 5 is rotatably connected to another set of rotating rods 22 through the rotating column 24. The rotating rod 22 has a groove 23 in which the rotating column 24 can slide, and the bottom end of the rotating rod 22 is rotatably connected to the bottom of the telescopic plate 4 through the bearing 12.

[0065] As the sleeve 14 is inserted into the rotating seat 3, the sleeve 14 uses the support rod 16 to drive a set of rotating rods 22 to pull the pad 5 downward. The pad 5, restricted by the through hole opened in the telescopic plate 4, can only slide vertically downward with the pull of the rotating rod 22. During this process, due to the downward sliding of the pad 5, another set of support rods 16 on the other side of the bottom of the pad 5 also rotates and tilts downward. Since the bottom of the set of rotating rods 22 is fixed to the bottom position of the telescopic plate 4 through the bearing 12, during the downward tilting of the set of rotating rods 22, the rotating column 24 set at the bottom of one side of the pad 5 can slide in the groove 23 opened in the set of rotating rods 22, thereby adapting to the positional movement caused by the up and down sliding of the pad 5. During this process, the pad 5 is completely retracted into the telescopic plate 4.

[0066] In another embodiment of the present invention, the damping mechanism includes a slide rail 15 formed on the inner side wall of the top of the rotating seat 3, a support rod 16 provided above the bottom end of the rod sleeve 14 is slidably connected to the top end of the slide rail 15, and one end of the telescopic rod 20 is fixedly connected to one side of the top end of the support rod 16. The other end of the telescopic rod 20 is movably inserted into the telescopic sleeve 19, and one-way rotating balls 28 are provided on both sides of the end of the telescopic rod 20 inserted into the telescopic sleeve 19.

[0067] In another embodiment of the present invention, the damping mechanism further includes a slider 17 fixedly connected to the other end of the telescopic sleeve 19. The slider 17 is slidably connected in the slide rail 15. Elastic balls 18 are provided on both sides of the slider 17. The slide rail 15 is opened with a large open end and a small closed end, and the size changes from the middle position.

[0068] In the above process, it should be noted that: the bottom end of the sleeve 14 is connected to the middle position of the support rod 16, while the rotating rod 22 is connected to the end of the lower support rod 16, and the other end of the upper support rod 16 is slidably connected to the slide rail 15. The slide rail 15 is opened at the top inside the rotating seat 3, and the top end of the support rod 16 is connected to the slider 17 that slides in the slide rail 15 through the telescopic rod 20 and the telescopic sleeve 19. In the above process, as the support rod 16 slides with the sleeve 14, the upper support rod 16 will push the telescopic rod 20 towards the telescopic sleeve 16. The telescopic rod 20 is inserted into the telescopic sleeve 19. One-way rotating balls 28 are provided on both sides of the insertion end of the telescopic rod 20. The one-way rotating balls 28 are installed using one-way bearings 12. The one-way rotating balls 28 can only rotate in the direction of pulling the telescopic rod 20 out of the telescopic sleeve 19. When the telescopic rod 20 is inserted into the telescopic sleeve 19, the one-way rotating balls 28 cannot rotate and can only slide. Therefore, the telescopic rod 20 provides a certain damping effect to the upper support rod 16 during the process of inserting the telescopic rod 20 into the telescopic sleeve 19 along with the support rod 16.

[0069] The effect here is that, because the support rod 16 is a relatively long rod, and the sleeve 14 is inserted into the rotating seat 3, the bottom end of the lower support rod 16 will pull the pad 5 downwards. At this time, there will be resistance at the bottom end of the lower support rod 16. If the top end of the upper support rod 16 is not equipped with a force to balance this resistance, the support rod 16 connected to the sleeve 14 may form a lever effect during the insertion of the sleeve 14 into the rotating seat 3. This will cause the upper support rod 16 to be pushed forward a greater distance due to the lack of resistance, while the lower support rod 16 will be pushed out a smaller distance due to the resistance, causing the support rod 16 to tilt and affecting the insertion of the sleeve 14 into the rotating seat 3.

[0070] Part Two is an appendix. Figure 2 In state A2, during this process, the clamping plate 6 continues to be inserted into the rotating seat 3. When the gasket 5 is fully retracted into the telescopic plate 4, the support rod 16 also slides to the bottom position of the slide groove 23. At this time, the rod sleeve 14 contacts the collar 13 sleeved on the bottom of the outer periphery of the inner rod 11. When the rod sleeve 14 continues to be inserted into the rotating seat 3, it will abut against the collar 13 and continuously press the collar 13 inward to squeeze the spring sleeve 10. At this time, the collar 13 will slide and squeeze the spring sleeve 10 on the surface of the inner rod 11, and insert the collar 13 from the initial position inserted into the limiting gear 25 into the fixed ring 26.

[0071] Simultaneously with the above-mentioned actions, after the support rod 16 fully inserts the telescopic rod 20 into the telescopic sleeve 19, the continuous insertion of the sleeve rod will cause the slider 17 to slide towards the bottom within the slide rail 15. Since the slide rail 15 is configured as shown in the attached diagram... Figure 6 The shape of the slider 17 is characterized by a large opening and a small closing bottom. The initial position of the slider 17 is located at the position where the size changes from large to small. Therefore, when the slider 17 slides towards the smaller end of the slide rail 15, the slide rail 15 will provide a certain damping effect on the elastic balls 18 on both sides of the slider 17, and drive the slider 17 to slide the vertical rod 8 towards the bottom. This causes the locking teeth 9 at the bottom of the vertical rod 8 to slide from the initial position where they are inserted into the outside of the limiting gear 25 to the position on the outer periphery of the fixing ring 26, which is completely misaligned with the limiting gear 25.

[0072] In this process, the advantage of setting the slide rail 15 with one end larger and the other end smaller is that after the sleeve 14 drives the support rod 16 to retract the pad 5 into the telescopic plate 4, the sleeve 14 continues to insert and drive the telescopic plate 4 to retract towards the bottom of the rotating seat 3. At this time, the resistance at the bottom of the support rod 16 is increased compared to the previous retraction of the pad 5. Therefore, when the telescopic plate 4 continues to retract, the force of the elastic ball 18 with elastic deformation capability being clamped by the slide rail 15 increases due to the change in the size of the slide rail 15, thereby adaptively increasing the damping at the top of the support rod 16 so as to keep the support rod 16 at the bottom of the sleeve 14 moving in a vertical state.

[0073] It should be noted that the elastic potential energy of the spring sleeve 10 is greater than that of the return spring 21. When the rod sleeve 14 does not contact the collar 13, the compression of the return spring 21 by the rod sleeve 14 cannot cause the inner rod 11 to compress the spring sleeve 10 due to the larger elastic potential energy of the spring sleeve 10. Only after the rod sleeve 14 contacts the collar 13 can the rod sleeve 14 be used to compress and displace the collar 13.

[0074] In another embodiment of the present invention, the rotating mechanism includes a turntable fixedly installed in the middle of the rotating side of the turntable 3. A fixed ring 26 is rotatably inserted into the turntable. One end of the fixed ring 26 is fixedly connected to the inner side of the movable frame 2, and the other end of the fixed ring 26 is inserted into the turntable 3 and fixedly connected to the limiting gear 25. A collar 13 is movably inserted into the limiting gear 25. A retaining tooth 9 is provided on the outer periphery of the collar 13. The retaining tooth 9 meshes with the retaining groove on the inner side of the limiting gear 25. The collar 13 is slidably sleeved on the bottom end of the inner rod 11. A spring sleeve 10 is provided on the periphery of the end of the inner rod 11 that is inserted into the fixed ring 26 to connect the collar 13.

[0075] In another embodiment of the present invention, the rotating mechanism further includes a vertical rod 8 fixedly connected to the bottom of the slider 17, and a retaining tooth 9 is provided at the bottom end of the vertical rod 8, which is engaged in a groove on the outer periphery of the limiting gear 25.

[0076] S3: After the clamping plate 6 clamps the circuit board to the set position, start the electric turntable 27 to slowly rotate the rotating base 3;

[0077] At this point, after all the restricted contacts in step S2 have been made, and because the internal and external locking teeth 9 of the limiting gear 25 have been separated from it, and the rotating base 3 is fixedly connected to the electric turntable 27, the electric turntable 27 is rotatably mounted inside the movable frame 2, and one end of the fixed ring 26 inserted inside the electric turntable 27 is fixedly connected to the limiting gear 25, and the other end of the fixed ring 26 is fixedly connected to the inside of the movable frame 2, so after the locking teeth 9 have been separated from the limiting gear 25, the electric turntable 27 can drive the rotating base 3 to rotate as a whole. At this time, because the pad 5 and the telescopic plate 4 have been retracted inside the rotating base 3, the circuit board placed inside the rotating base 3 is completely held by the clamping plate 6 at both ends of the circuit board. Therefore, when the circuit board is slowly rotated for shooting, both sides of the circuit board can be completely photographed.

[0078] S4: During the slow rotation of the circuit board, the auxiliary light and high-resolution camera mounted on the top of the vision inspection machine 1 are used to photograph and inspect the solder joints on the surface of the circuit board.

[0079] During the slow rotation of the circuit board, a high-resolution camera on top of the vision inspection unit 1 simultaneously captures images of both surfaces of the circuit board and inspects the solder joints.

[0080] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A wave soldering quality inspection system, comprising: A visual inspection body (1), wherein a movable frame (2) symmetrically arranged and capable of relative movement is provided inside the visual inspection body (1), and a high-resolution camera and auxiliary lighting are installed on the top of the visual inspection body (1), characterized in that it further includes: Two sets of rotating seats (3) are rotatably installed inside the movable frame (2). The rotating seat (3) is connected to the movable frame (2) on one side as the rotating side and the rotating seat (3) on the other side as the clamping side. Clamping plate (6), which is movably inserted into the middle of the clamping side of the rotating base (3); Telescopic plate (4), which is movably inserted into the bottom of the clamping side; Gasket (5), which is movably inserted into the surface of telescopic plate (4); The clamping mechanism is connected to the clamping plate (6). When the clamping plate (6) is pressing the two ends of the circuit board, the clamping plate (6) retracts into the rotating seat (3) as the clamping force increases, passively driving the pad (5) to retract into the telescopic plate (4) and separate from the circuit board. At the same time, when the pad (5) and the telescopic plate (4) retract, the damping mechanism is used to adaptively adjust the force on both ends of the support rod (16) in the clamping mechanism, and simultaneously releases the restriction on the rotation mechanism. After clamping both ends of the circuit board, the circuit board is slowly rotated for testing. The bottom of the clamping plate (6) is fixedly connected to the rod sleeve (14). The rod sleeve (14) is inserted into the rotating seat (3). The bottom end of the rod sleeve (14) is fixedly connected to the middle of the support rod (16). The lower support rod (16) is L-shaped and is rotatably connected to one end of a set of rotating rods through a bearing. The other end of the rotating rod is rotatably connected to one side of the bottom of the pad (5). The other side of the bottom of the pad (5) is movably connected to the slide groove (23) through the rotating column (24). The slide groove (23) is opened in another set of rotating rods. The bottom end of the other set of rotating rods is rotatably connected to the bottom of the telescopic plate (4) through a bearing. The support rod (16) is slidably connected in the movable groove (7). The movable groove (7) is opened on the surface of the telescopic plate (4).

2. The wave soldering quality inspection system according to claim 1, characterized in that, The clamping mechanism also includes an inner rod (11) that is movably inserted into the rod sleeve (14). The top end of the inner rod (11) is movably inserted into the rod sleeve (14) via a return spring (21), and the other end of the inner rod (11) is rotatably connected to the bottom of the fixing ring (26) via a bearing.

3. The wave soldering quality inspection system according to claim 2, characterized in that, The damping mechanism includes a slide rail (15) opened on the inner side wall of the top of the rotating seat (3). The top end of the support rod (16) provided above the bottom end of the rod sleeve (14) is slidably connected to the slide rail (15), and one end of the telescopic rod (20) is fixedly connected to one side of the top end of the support rod (16). The other end of the telescopic rod (20) is movably inserted into the telescopic sleeve (19). One-way rotating balls (28) are provided on both sides of the end of the telescopic rod (20) inserted into the telescopic sleeve (19).

4. The wave soldering quality inspection system according to claim 3, characterized in that, The damping mechanism also includes a slider (17) fixedly connected to the other end of the telescopic sleeve (19). The slider (17) is slidably connected inside the slide rail (15). Elastic balls (18) are provided on both sides of the slider (17). The slide rail (15) is opened with a large opening size and a small closing size, and the size changes from the middle position.

5. The wave soldering quality inspection system according to claim 4, characterized in that, The rotating mechanism includes a turntable fixedly installed in the middle of the rotating side of the turntable (3). A fixed ring (26) is rotatably inserted into the turntable. One end of the fixed ring (26) is fixedly connected to the inner side of the movable frame (2). The other end of the fixed ring (26) is inserted into the turntable (3) and fixedly connected to the limiting gear (25). A collar (13) is movably inserted into the limiting gear (25). A retaining tooth (9) is provided on the outer periphery of the collar (13). The retaining tooth (9) meshes with the retaining groove on the inner side of the limiting gear (25). The collar (13) is slidably sleeved on the bottom end of the inner rod (11). A spring sleeve (10) is provided on the periphery of the end of the inner rod (11) inserted into the fixed ring (26) to connect the collar (13).

6. The wave soldering quality inspection system according to claim 5, characterized in that, The rotating mechanism also includes a vertical rod (8) fixedly connected to the bottom of the slider (17), and the bottom end of the vertical rod (8) is provided with a locking tooth (9), which is engaged in the slot on the outer periphery of the limiting gear (25).

7. The wave soldering quality inspection system according to claim 6, characterized in that, The one-way ball (28) is installed using a one-way bearing. The one-way ball (28) can only rotate in the direction of pulling out of the telescopic sleeve (19) along the telescopic rod (20). When the telescopic rod (20) is inserted into the telescopic sleeve (19), the one-way ball (28) cannot rotate and can only slide against the inner wall of the telescopic sleeve (19).

8. The wave soldering quality inspection system according to claim 7, characterized in that, The limiting gear (25) has multiple sets of tooth grooves on both its outer and inner sides to achieve dual limiting of the limiting gear (25).

9. A method for inspecting the quality of wave soldering, characterized in that, For a wave soldering quality inspection system as described in any one of claims 1-8, the inspection method includes: S1: Place the circuit board on the pad provided at the bottom inside the turntable; S2: The movable frames retract inwards, and the circuit board is clamped by the clamping plates contacting the edge of the circuit board; S3: After the clamping plate holds the circuit board to the set position, start the turntable to slowly rotate the turntable; S4: As the circuit board slowly rotates, the auxiliary lighting and high-resolution camera mounted on top of the vision inspection machine are used to photograph and inspect the solder joints on the surface of the circuit board.

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