Circuit board double-sided visual inspection equipment

Abstract

The invention provides circuit board double-sided visual inspection equipment, which comprises a bottom plate, a clamping assembly which is arranged on the bottom plate and is used for clamping a circuit board, and a composite assembly which is arranged on the bottom plate and is used for carrying out aluminum strip welding and double-sided visual inspection on double sides of the clamped circuit board, the clamping assembly comprises a supporting plate installed on the bottom plate, a limiting cutting plate installed on one side of the supporting plate and used for cutting an aluminum strip and limiting the placement position of a circuit board, clamping plates symmetrically installed on the two sides of the supporting plate and a moving assembly for adjusting the positions of the clamping plates, and a groove is further formed in the position, located at the placement position of the circuit board, of the supporting plate. Symmetrical clamping plates are adopted and matched with an adjusting plate driven by a first air cylinder, self-adaptive clamping of circuit boards of different sizes is achieved, two conveying belts are matched with embedded magnets, and automatic adsorption and accurate positioning of aluminum strips are achieved; the second motor drives the conveying belt to ensure that the aluminum strip is continuously fed and always covers the welding hole position.

Description

Technical Field

[0001] The present invention relates to a double-sided vision inspection device for circuit boards, in particular to the technical fields of double-sided vision inspection of circuit boards and aluminum strip welding. Background Art

[0002] As a core component of electronic devices, the welding quality of a printed circuit board (PCB) directly affects the reliability and performance of the product. With the development of electronic products towards high density, high power, and high frequency, traditional single-sided inspection and welding technologies can no longer meet the following requirements: The aluminum strip, as a conductive layer, can absorb / reflect high-frequency electromagnetic waves to reduce signal crosstalk; the aluminum strip can replace some copper traces; the aluminum strip can quickly conduct heat from high-power components to reduce thermal resistance.

[0003] Currently, the circuit board welding inspection devices on the market have the following defects:

[0004] Single-sided inspection blind spot: Most devices only perform single-sided inspection and cannot simultaneously evaluate the quality of double-sided solder joints, resulting in missed inspections of defects such as false soldering and bridging.

[0005] Low efficiency in aluminum strip processing: The aluminum strip needs to be pre-cut and manually bonded. The positioning accuracy is poor, and the oxide layer affects the welding yield.

[0006] Fragmented device functions: Welding and inspection belong to independent workstations, and the data is not interconnected, so the welding parameters cannot be corrected in real time.

[0007] Poor adaptability to flexible boards: The existing clamping mechanism is prone to damage the flexible PCB, and there is a lack of warping compensation mechanism, resulting in welding offset. Summary of the Invention

[0008] Object of the Invention: To provide a double-sided vision inspection device for circuit boards to solve the above problems existing in the prior art.

[0009] Technical Solution: A double-sided vision inspection device for circuit boards, comprising:

[0010] A bottom plate, a clamping assembly installed on the bottom plate for clamping the circuit board, and a composite assembly installed on the bottom plate for performing aluminum strip welding and double-sided vision inspection on the double sides of the clamped circuit board;

[0011] The clamping assembly includes a support plate installed on the bottom plate, a limit cutting plate installed on one side of the support plate for cutting the aluminum strip and restricting the placement position of the circuit board, clamping plates symmetrically installed on both sides of the support plate, and a moving assembly for adjusting the position of the clamping plates. The support plate is also provided with a groove at the circuit board placement position.

[0012] The composite component includes a welding torch, a camera installed above the welding torch and obtaining visual information of the circuit board, a first moving part for adjusting the movement of the welding torch in the Z-axis direction, a second moving part for adjusting the movement of the first moving part in the X-axis direction, and a third moving part for adjusting the movement of the second moving part in the Y-axis direction.

[0013] In a further embodiment, a gear shaft is inserted into the limiting cutting plate. The gear shaft meshes with two mutually parallel racks arranged in the limiting cutting plate. A cutter for cutting the aluminum strip is provided on the rack, and a through hole for inserting the aluminum strip is provided on the limiting cutting plate.

[0014] In a further embodiment, a second motor for driving the conveyor belt to rotate is provided at the bottom of the clamping plate. Two magnets are evenly distributed on the conveyor belt, and the moving direction of the cutter is perpendicular to the surface of the aluminum strip.

[0015] In a further embodiment, the first moving part, the second moving part and the third moving part all include a lead screw, a driving motor for driving the lead screw to operate, and a slider for converting the circumferential movement of the lead screw into an axial movement; the composite components are symmetrically arranged on both sides of the clamping component, and the welding torch is aligned with the aluminum strip in the welding hole as required.

[0016] In a further embodiment, the moving component includes a first cylinder installed on the bottom plate and used for adjusting the distance between two clamping plates, and an adjusting plate installed on the moving end of the first cylinder. The adjusting plate is connected to the clamping plate through a detachable clamping structure.

[0017] In a further embodiment, the clamping plate is provided with a plurality of welding holes corresponding to the welding of the aluminum strip of the circuit board. Two conveyor belts are provided on the clamping plate and do not cover the positions of the welding holes. At least two magnets that can move with the conveyor belt and adsorb and transfer the aluminum strip are provided between the two conveyor belts.

[0018] In a further embodiment, the magnet is used to adsorb and transfer the welded aluminum strip. The aluminum strip covers the double-sided positions of the circuit board. The aluminum strip is continuously conveyed and covers the corresponding welding holes. A first motor for driving the gear shaft to rotate is also provided on one side of the limiting cutting plate.

[0019] Beneficial effects: The present invention provides a circuit board double-sided vision detection device. By adopting a symmetrical clamping plate and cooperating with an adjusting plate driven by a first cylinder, adaptive clamping of circuit boards of different sizes is realized. Two conveyor belts cooperate with embedded magnets to realize automatic adsorption and precise positioning of the aluminum strip; a second motor drives the conveyor belt to ensure continuous feeding of the aluminum strip and always cover the position of the welding hole;

[0020] The gear shaft drives the synchronous movement of the double racks, driving the cutting tool to vertically cut the aluminum strip; the first motor precisely controls the cutting timing, seamlessly connecting with the welding process; a composite component composed of welding torches and cameras arranged symmetrically on both sides is symmetrically installed on both sides of the clamping component to synchronously complete welding and visual inspection;

[0021] The aluminum strip is accurately conveyed through magnets and a conveyor belt, and is automatically cut in combination with a limit cutting plate; the clamping position of the circuit board is hidden by the groove, meeting the welding of the aluminum strip at different positions on the circuit board. The aluminum strip is adsorbed and conveyed by magnets to reduce manual contact, and the cutting tool quickly cuts to reduce the oxidation risk. Brief Description of the Drawings

[0022] Figure 1 It is a three-dimensional view of the present invention.

[0023] Figure 2 It is the front view of the present invention.

[0024] Figure 3 It is the right view of the present invention.

[0025] Figure 4 It is a three-dimensional view of the composite component of the present invention.

[0026] Figure 5 It is a three-dimensional view of the clamping component of the present invention.

[0027] Figure 6 It is the right view of the clamping component of the present invention.

[0028] Figure 7 It is the front view of the clamping component of the present invention.

[0029] Figure 8 It is the rear view of the clamping component of the present invention.

[0030] Figure 9 It is the top view of the clamping component of the present invention.

[0031] Figure 10 It is the front cross-sectional view of the clamping plate component of the present invention.

[0032] Figure 11 It is a three-dimensional schematic diagram of the clamping plate of the present invention.

[0033] Figure 12 It is the rear view of the clamping plate of the present invention.

[0034] The attached components are marked as: 1. Camera; 2. Bottom plate; 3. Clamping component; 4. Composite component; 31. Moving component; 32. Clamping plate; 33. Support plate; 34. Groove; 35. Limit cutting plate; 41. Welding torch; 42. First moving part; 43. Second moving part; 44. Third moving part; 100. Circuit board; 311. First cylinder; 312. Adjusting plate; 351. First motor; 352. Gear shaft; 353. Rack; 354. Through hole; 361. Second motor; 362. Welding hole; 363. Aluminum strip; 364. Conveyor belt; 365. Magnet. Detailed implementation mode

[0035] To solve the problems existing in the prior art, the present invention provides a double-sided vision inspection device for circuit boards, which effectively solves the above problems through modular clamping, automatic aluminum strip feeding and cutting, and three-axis linkage welding, and is applicable to the vision inspection of circuit boards of different sizes and the aluminum strip welding scenario.

[0036] The following further specifically describes the solution through examples and in combination with the drawings.

[0037] In this application, a double-sided vision inspection device for circuit boards is proposed, including:

[0038] A bottom plate 2, a clamping component 3 installed on the bottom plate 2 for clamping the circuit board 100, and a composite component 4 installed on the bottom plate 2 for welding the aluminum strip 363 on both sides of the clamped circuit board 100 and performing double-sided vision inspection.

[0039] The clamping component 3 includes a support plate 33 installed on the bottom plate 2, a limit cutting plate 35 installed on one side of the support plate 33 for cutting the aluminum strip 363 and restricting the placement position of the circuit board 100, clamping plates 32 symmetrically installed on both sides of the support plate 33, and a moving component 31 for adjusting the position of the clamping plates 32. The moving component 31 includes a first cylinder 311 installed on the bottom plate 2 for adjusting the distance between the two clamping plates 32, and an adjusting plate 312 installed on the moving end of the first cylinder 311. The adjusting plate 312 is connected to the clamping plate 32 through a detachable clamping structure.

[0040] The support plate 33 is also provided with a groove 34 at the placement position of the circuit board 100. A gear shaft 352 is inserted into the limit cutting plate 35. The gear shaft 352 meshes with two mutually parallel racks 353 arranged in the limit cutting plate 35. A cutter for cutting the aluminum strip 363 is provided on the rack 353. The limit cutting plate 35 is provided with a through hole 354 for inserting the aluminum strip 363. The cutter cuts the aluminum strip 363 inserted into the through hole 354 to cut an appropriate length. A second motor 361 for driving the conveyor belt 364 to rotate is provided at the bottom of the clamping plate 32. Two magnets 365 are evenly distributed on the conveyor belt 364. The moving direction of the cutter is perpendicular to the surface of the aluminum strip 363. The clamping plate 32 is provided with a plurality of welding holes 362 corresponding to the welding of the aluminum strip 363 of the circuit board 100. There are two conveyor belts 364 on the clamping plate 32 that do not cover the positions of the welding holes 362. At least two magnets 365 that can move with the conveyor belt 364 and adsorb and transfer the aluminum strip 363 are provided between the two conveyor belts 364. The magnet 365 is used to adsorb and transfer the welded aluminum strip 363. The aluminum strip 363 covers the double-sided positions of the circuit board 100. The aluminum strip 363 is continuously conveyed and covers the corresponding welding holes 362. A first motor 351 for driving the gear shaft 352 to rotate is further provided on one side of the limit cutting plate 35.

[0041] The composite assembly 4 includes a welding torch 41, a camera 1 installed above the welding torch 41 and acquiring visual information of the circuit board 100, a first moving part 42 for adjusting the movement of the welding torch 41 in the Z-axis direction, a second moving part 43 for adjusting the movement of the first moving part 42 in the X-axis direction, and a third moving part 44 for adjusting the movement of the second moving part 43 in the Y-axis direction. The first moving part 42, the second moving part 43, and the third moving part 44 each include a lead screw, a driving motor for driving the lead screw to operate, and a slider for converting the circumferential movement of the lead screw into an axial movement. The composite assembly 4 is symmetrically arranged on both sides of the clamping assembly 3. The welding torch 41 is aligned with the aluminum strip 363 in the welding hole 362 as required.

[0042] Working principle: The clamping and positioning process of the circuit board 100; The circuit board 100 to be tested is placed in the groove 34 of the support plate 33 (the depth of the groove 34 can adapt to circuit boards 100 of different heights). The first cylinder 311 of the moving assembly 31 is used to push the adjusting plate 312, driving the clamping plates 32 on both sides to move towards the center. The clamping plates 32 are adaptively pressed against the circuit board 100 through a detachable clamping structure to ensure the stable fixation of the circuit board 100. The side of the limit cutting plate 35 blocks the circuit board 100 to ensure that its placement position is accurately aligned with the welding holes 362;

[0043] During the cutting and transfer process of the aluminum strip 363, the aluminum strip 363 passes through the through-hole 354 of the limit cutting plate 35 and is driven by the conveyor belt 364 to move towards the welding hole 362. The magnet 365 on the conveyor belt 364 adsorbs the aluminum strip 363 to ensure that it is flat and fits the conveying path. The first motor 351 drives the gear shaft 352 to rotate, driving the rack 353 to link the cutter to cut vertically downward. The cutter cuts the aluminum strip 363 to a preset length. The cut aluminum strip 363 is continuously adsorbed and conveyed by the magnet 365 until it covers the welding position corresponding to the circuit board 100 of the target welding hole 362. The second motor 361 controls the start and stop of the conveyor belt 364 to achieve precise positioning of the aluminum strip 363.

[0044] During the double-sided welding process, the second moving part 43 and the third moving part 44 drive the welding torch 41 above the target welding hole 362. The first moving part 42 fine-tunes the height of the welding torch 41 to ensure a constant contact pressure with the aluminum strip 363. The welding torches 41 on both sides simultaneously emit laser / arc to melt the aluminum strip ********** 363 and the pads of the circuit board 100 to form a metallurgical bond. The welding parameters are automatically matched according to the size of the welding hole 362.

[0045] During the visual inspection process, the camera 1 above the welding torch 41 takes the solder joint images of the original image of the circuit board 100 immediately before and after welding. The double-sided camera 1 works synchronously to collect data on the solder joint morphology and the coverage of the aluminum strip 363.

[0046] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation of the present invention itself. Various changes can be made in its form and details without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

1. A double-sided vision inspection device for a circuit board, comprising: A base plate, a clamping assembly mounted on the base plate for clamping a circuit board, and a composite assembly mounted on the base plate for performing double-sided aluminum strip welding and double-sided vision inspection on the clamped circuit board; It is characterized in that the clamping assembly includes a support plate mounted on the base plate, a limit cutting plate mounted on one side of the support plate for cutting the aluminum strip and restricting the placement position of the circuit board, clamping plates symmetrically mounted on both sides of the support plate, and a moving assembly for adjusting the position of the clamping plates. A groove is also provided in the support plate at the circuit board placement position. The composite assembly includes a welding torch, a camera mounted above the welding torch for obtaining visual information of the circuit board, a first moving part for adjusting the movement of the welding torch in the Z-axis direction, a second moving part for adjusting the movement of the first moving part in the X-axis direction, and a third moving part for adjusting the movement of the second moving part in the Y-axis direction.

2. The double-sided vision inspection device for circuit boards according to claim 1, characterized in that, A gear shaft is inserted into the limit cutting plate. The gear shaft meshes with two parallel racks provided in the limit cutting plate. A cutter for cutting the aluminum strip is provided on the rack. The limit cutting plate is provided with a through hole for inserting the aluminum strip.

3. The double-sided vision inspection device for circuit boards according to claim 2, characterized in that, A second motor for driving the conveyor belt to rotate is provided at the bottom of the clamping plate. Two magnets are evenly distributed on the conveyor belt. The moving direction of the cutter is perpendicular to the surface of the aluminum strip.

4. A double-sided visual inspection device for circuit boards according to claim 1, characterized in that, The first moving part, the second moving part, and the third moving part all include a lead screw, a driving motor for driving the lead screw to operate, and a slider for converting the circumferential movement of the lead screw into an axial movement. The composite assembly is symmetrically arranged on both sides of the clamping assembly, and the welding torch is aligned with the aluminum strip in the welding hole as required.

5. A double-sided vision inspection device for circuit boards according to claim 1, characterized in that, The moving assembly includes a first cylinder mounted on the base plate for adjusting the distance between the two clamping plates, and an adjusting plate mounted on the moving end of the first cylinder. The adjusting plate is connected to the clamping plate through a detachable clamping structure.

6. The double-sided vision inspection device for circuit boards according to claim 5, wherein The clamping plate is provided with a plurality of welding holes corresponding to the aluminum strip welding of the circuit board. Two conveyor belts are provided on the clamping plate and do not cover the positions of the welding holes. At least two magnets that can move with the conveyor belt and adsorb and transfer the aluminum strip are provided between the two conveyor belts.

7. A double-sided visual inspection device for circuit boards according to claim 6, characterized in that, The magnet is used to adsorb and transfer the welded aluminum strip. The aluminum strip covers the double-sided positions of the circuit board. The aluminum strip is continuously conveyed and covers the corresponding welding holes. A first motor for driving the gear shaft to rotate is also provided on one side of the limit cutting plate.

Images