An AOI detection device and method for automotive electronic components

Abstract

The present invention belongs to the technical field of AOI inspection of electronic components, and specifically relates to an AOI inspection device and method for automotive electronic components. The device comprises a housing; a conveyor belt: the conveyor belt cooperates with the housing; an AOI camera unit: the AOI camera unit is located inside the housing and is used to inspect electronic components; an X-ray camera unit: the X-ray camera unit is used to inspect obscured portions of electronic components; a fixing unit: the fixing unit is used to fix electronic components and cooperates with the conveyor belt; a processor: the processor is fixedly connected to the housing, and the conveyor belt, AOI camera unit, and X-ray camera unit are all electrically connected to the processor; a power supply unit; a judgment unit: the judgment unit is used to determine whether the electronic component is heating abnormally; the AOI camera unit, power supply unit, judgment unit, and X-ray camera unit are connected in sequence. This solution solves the problem of slow detection speed and low detection efficiency of X-ray detection devices.

Description

Technical Field

[0001] The present invention belongs to the technical field of AOI detection of electronic components, and specifically relates to an AOI detection device and method for automotive electronic components. Background Art

[0002] With the trend toward electrification, intelligence, and connectivity in vehicles, the application scope of automotive electronic components continues to expand. From engine management systems to automated driver assistance systems to in-vehicle infotainment systems, the quality of these electronic components is directly related to vehicle safety and reliability. Therefore, efficient inspection methods are crucial to ensuring the quality of these components. Automated Optical Inspection (AOI) of automotive electronic components is a key step in ensuring their quality, especially given the increasing reliance on complex electronic systems in modern vehicles.

[0003] Currently, a multifunctional chip AOI inspection and processing equipment with the announcement number CN117380573A on the market includes a lower platform, a detection and conveying device and an NG double unloading device are provided on the top of the lower platform, a loading device is provided at one end of the detection and conveying device, a double-sided AOI inspection device, an X-ray inspection device and two NG screening and picking devices are all provided above the detection and conveying device, and an upper NG tray device is provided above the NG double unloading device. The multifunctional chip AOI inspection and processing equipment, through the provision of the loading device, the detection and conveying device and the upper NG tray device, can realize the automatic loading and unloading of chips, the transmission between monitoring stations and the automatic loading of NG trays, effectively improving its work efficiency. At the same time, the equipment as a whole realizes the loading and unloading, classification and detection screening processes of qualified chips and NG chips, greatly improving the detection efficiency of chips, and integrating AOI inspection and X-ray inspection.

[0004] This solution first uses AOI to inspect components for correctness and surface solder joints, then uses X-ray inspection to verify the correctness of solder joints hidden beneath the components. This method comprehensively inspects electronic components and reduces false positives. However, there is a problem: X-ray inspection is slow and time-consuming, resulting in low inspection efficiency. Summary of the Invention

[0005] This solution provides an AOI inspection device for automotive electronic components, which is used to solve the problem of low inspection efficiency caused by slow inspection speed of X-ray inspection devices.

[0006] This solution provides an AOI inspection device for automotive electronic components, comprising a housing, the housing being provided with a control panel; a conveyor belt, the conveyor belt cooperating with the housing and used to transport electronic components; an AOI camera unit, the AOI camera unit being located inside the housing and used to inspect electronic components; an X-ray camera unit, the X-ray camera unit being used to inspect obstructed portions of electronic components; a fixing unit, the fixing unit being used to fix electronic components and cooperating with the conveyor belt; a processor, the processor being fixedly connected to the housing, the conveyor belt, the AOI camera unit, and the X-ray camera unit being electrically connected to the processor; a power-on unit, the power-on detection unit being used to energize the electronic components; and a judgment unit, the judgment unit being used to determine whether the electronic components are heating abnormally. The AOI camera unit, the power-on unit, the judgment unit, and the X-ray camera unit are sequentially connected.

[0007] The principle of this solution is as follows: the operator fixes the electronic component on the fixing mechanism, and then fixes the fixing mechanism to the conveyor belt. The operator starts the conveyor belt, and the electronic component enters the AOI camera unit area. The conveyor belt stops running, and the AOI camera unit performs a round of inspection. If it passes, it enters the next round of inspection. If it fails, it is marked and then directly transported out via the conveyor belt.

[0008] After a round of inspection, qualified products stop at the power-on unit under the transportation of the conveyor belt. The power-on unit is energized and the judgment unit determines whether the heating is normal. If the heating is abnormal, it is sent to the X-ray camera unit for inspection to determine whether the hidden solder joints are abnormal. If the solder joints are abnormal, they are marked, and if they are normal, they are qualified products.

[0009] The beneficial effect of this solution is that: this solution performs power-on testing through the power-on unit, and then uses the judgment unit to determine whether there is abnormal heating. After excluding the surface components and solder joints, if the power is still normal and the heating is normal, then there is a high probability that the hidden solder joints are normal, and there is no need to use the X-ray unit for detection, which greatly saves time and improves the overall detection efficiency.

[0010] Furthermore, it also includes a moving mechanism, which moves the fixed unit to the X-ray imaging unit. The moving mechanism is electrically connected to the processor. The fixed unit includes a fixed block, a clip and a suction cup. The clip is rotatably connected to the fixed block, the suction cup is fixedly connected to the fixed block, and the suction cup cooperates with the conveyor belt.

[0011] The X-ray camera unit is located on the side of the conveyor belt. The operator opens the latch, places the electronic component on it, and secures it with the latch to ensure it remains in place during inspection. The unit is then held to the conveyor belt using the suction cup's force. If a product is detected as defective, the processor controls the mobile mechanism to move the fixed unit off the conveyor belt and grab it to the X-ray camera unit. The mechanism's fixed unit is secured with a suction cup to facilitate removal, ensuring that the AOI camera unit is not delayed when the X-ray camera unit is required.

[0012] Furthermore, it also includes a piston and a spring. The fixed block is provided with an inner groove. The piston is slidingly and sealingly connected to the inner groove, and the piston divides the inner groove into a cavity and a working fluid cavity. The working fluid cavity is provided with a working fluid, and the boiling point of the working fluid is 70-80 ° C. The cavity is connected to the suction cup. One end of the spring is fixedly connected to the piston, and the other end is fixedly connected to the cavity.

[0013] When the power supply unit energizes the electronic component, it generates abnormal heat, causing the working fluid chamber temperature to reach the set temperature. The working fluid in the chamber vaporizes, causing the piston to move outward. The piston squeezes the gas in the chamber, inflating the suction cup and rendering it ineffective. This mechanism uses the abnormal heat generated by the electronic component to disable the suction cup, making it easier for the moving mechanism to move the fixed unit.

[0014] Furthermore, the moving mechanism includes an electric cylinder and an electromagnet, the fixed block is a ferromagnetic material, the electric cylinder is fixedly connected to the box, the push rod of the electric cylinder is fixedly connected to the electromagnet, the electromagnet cooperates with the fixed block, and the X-ray imaging unit cooperates with the electric cylinder.

[0015] When the power supply unit energizes the electronic component and the component heats abnormally, the judgment unit sends an electrical signal, and the processor controls the electric cylinder and electromagnet to start, causing the push rod to move the electromagnet. The electromagnet then attracts the column fixed block. The push rod then retracts, bringing the fixed unit to the X-ray imaging unit. After the X-ray imaging unit completes the inspection, the electromagnet is de-energized, and the fixed unit falls out. This mechanism achieves the effect of grasping, moving and placing through the electromagnet and electric cylinder, saving costs.

[0016] Furthermore, the judgment unit is a contact sensor, which is fixedly connected to the conveyor belt and electrically connected to the processor. The operator adsorbs the suction cup of the fixed unit on the contact sensor. When entering the power-on unit, the contact sensor is also powered on. When the electronic component operates normally, the suction cup contacts the contact sensor, the contact sensor is not triggered, and no electrical signal is sent. When the electronic component heats up abnormally, the suction cup is released and does not contact the contact sensor. The contact sensor is triggered, an electrical signal is sent, and the electromagnet and electric cylinder are started. This mechanism uses a contact sensor to determine whether the heating is normal, replacing the existing thermal imaging detection device and saving costs.

[0017] Furthermore, the working fluid is ethanol, which has a boiling point of 78.4°C. A sealant is provided at the piston sliding point to prevent ethanol volatilization, and the working fluid chamber is filled with helium after purging air. Ethanol is a non-toxic liquid and can serve as a good working fluid.

[0018] This solution also provides an AOI inspection method for automotive electronic components, including the following steps:

[0019] Step S10: The operator fixes the electronic component on the fixing block, and then fixes the fixing block on the conveyor belt through the suction cup;

[0020] Step S20: The operator starts the conveyor belt, and the electronic components enter the AOI camera unit area. The conveyor belt stops running, and the AOI camera unit performs a round of inspection. If qualified, it enters the next round of inspection. If unqualified, it is marked by the marking unit and then directly transported out via the conveyor belt;

[0021] Step S30: The qualified products after a round of inspection stop at the power-on unit under the transportation of the conveyor belt. The power-on unit is energized. If the heat is abnormal, it is sent to the X-ray camera unit for inspection to determine whether the hidden solder joints are abnormal. If the solder joints are abnormal, they are marked by the marking unit. If they are normal, they are qualified products.

[0022] This method does not require all products to be inspected by X-ray, thus saving time and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a structural diagram of an AOI inspection device for automotive electronic components.

[0024] Figure 2 This is a top view of an AOI inspection device for automotive electronic components.

[0025] Figure 3 This is a structural diagram of the moving mechanism of an AOI inspection device for automotive electronic components.

[0026] The figure marks in the specification include: 1. box body; 2. processor; 3. control panel; 4. box door; 5. electronic component; 6. fixing unit; 7. conveyor belt; 8. AIO camera unit; 9. first robotic arm; 10. power supply unit; 11. marking unit; 12. second robotic arm; 13. X-ray camera unit; 14. electric cylinder; 15. suction cup; 16. cavity; 17. working fluid chamber; 18. buckle; 19. electromagnet; 20. contact sensor; 21. bottom fixing rod; 22. alarm; 23. piston; 24. spring. DETAILED DESCRIPTION

[0027] As attached Figure 1 As shown:

[0028] This solution provides an AOI inspection device for automotive electronic components 5, comprising a housing 1 provided with a door 4 for opening to inspect and repair the equipment. A control panel 3 and a processor 2 are also mounted on the housing 1, with the control panel 3 electrically connected to the processor 2. A bottom fixing rod 21 is provided at the bottom of the housing 1 to secure the housing 1 and prevent shaking of the housing 1, which could cause the AOI camera unit to shake and cause inaccurate focusing. An alarm 22 is provided at the top of the housing 1, electrically connected to the processor 2. This alarm 22 is primarily used to warn of unqualified products, flashing when unqualified products are detected.

[0029] As attached Figure 1 、 Figure 2 As shown:

[0030] The conveyor belt 7 is an existing flat-plate conveyor belt 7, and the fixing unit 6 is fixed on the conveyor belt 7. The fixing unit 6 is used to fix the electronic component 5. The conveyor belt 7 crosses the box body 1. Two groups of AIO camera units 8, power supply units 10 and x-ray camera units 13 are provided inside the box body 1. The power supply unit 10, a moving mechanism and a marking unit 11 are also provided. The conveyor belt 7 runs from left to right, and the units inside the box body 1 are arranged from left to right in the order of AIO camera unit 8, power supply unit 10, AIO camera unit 8, power supply unit 10 and marking unit 11. There are also two moving mechanisms, which are arranged on the side of the power supply unit 10. The AIO camera unit 8, the power supply unit 10 and the x-ray camera unit 13 all use existing equipment. The AIO camera unit 8 is moved in a plane by the first robotic arm 9, and the x-ray camera unit 13 is moved in a plane by the second robotic arm 12.

[0031] As attached Figure 2 、 Figure 3 As shown:

[0032] There are multiple fixing units 6, which include a fixing block, a buckle 18 and a suction cup 15. The buckle 18 is rotatably connected to the fixing block. The buckle 18 is used to detachably fix the electronic component 5. The suction cup 15 is fixedly connected to the fixing block. There are multiple contact sensors 20 on the conveyor belt 7. The contact sensor 20 needs to be energized at the power-on unit 10. This can avoid the process being disrupted by the simultaneous triggering of multiple contact sensors 20. The contact sensor 20 does not send an electrical signal when in contact, but sends an electrical signal when not in contact. The suction cup 15 is adsorbed on the conveyor belt 7 with the contact sensor 20. This allows the contact sensor 20 to also play a positioning role.

[0033] The fixed block has an inner groove and is made of a ferromagnetic material, preferably copper, for its good thermal conductivity and cost-effectiveness. A piston 23 is slidably and sealingly connected to the inner groove. The piston 23 divides the inner groove into a cavity 16 and a working fluid chamber 17. The working fluid chamber 17 contains a working fluid with a boiling point of 70-80°C (ethanol, which has a boiling point of 78.4°C, is used in this embodiment). Cavity 16 is connected to the suction cup 15. A spring 24 is fixedly connected to the piston 23 at one end and to the cavity 16 at the other.

[0034] The moving mechanism includes an electric cylinder 14 and an electromagnet 19. The fixed block is made of ferromagnetic material. The electric cylinder 14 is fixedly connected to the housing 1. The push rod of the electric cylinder 14 is fixedly connected to the electromagnet 19. The electromagnet 19 cooperates with the fixed block. The X-ray imaging unit is located within the range of motion of the electric cylinder 14 and above the electric cylinder 14. The electric cylinder 14 and the fixed block are at the same height.

[0035] As attached Figure 1 、 Figure 2 、 Figure 3 As shown:

[0036] The principle of this solution is as follows: an operator secures an electronic component 5 to a fixing block, which is then fixed to a position on conveyor belt 7 with a contact sensor 20 using a suction cup 15. The operator then starts conveyor belt 7, and the electronic component 5 enters the AOI camera unit area. Processor 2 controls conveyor belt 7 to stop, and the AOI camera unit performs a round of inspection. If the component passes, it proceeds to the next round of inspection. If it fails, the marking unit 11 marks it and the component is then directly transported off conveyor belt 7.

[0037] After a round of qualified products are transported by conveyor belt 7, they stop at power supply unit 10. Power supply unit 10 is energized, which simultaneously energizes contact sensor 20. When the temperature reaches a set point, the ethanol in working fluid chamber 17 boils and vaporizes, causing the internal space to expand and piston 23 to move. This movement of piston 23 pushes the gas in cavity 16 toward suction cup 15, causing it to lose its adsorption capacity.

[0038] At this time, the contact sensor 20 is not touched, and the contact sensor 20 sends an electrical signal. The processor 2 controls the electric cylinder 14 and the electromagnet 19 to start. The electric cylinder 14 brings the electromagnet 19 into contact with the fixed block and adsorbs the fixed block. Then the electric cylinder 14 takes the fixed block away from the conveyor belt 7 and returns it to the range of the X-ray imaging unit 13. The X-ray imaging unit 13 starts detection.

[0039] The X-ray imaging unit 13 detects and determines whether the hidden solder joints are abnormal. If the solder joints are abnormal, they are marked by the marking unit 11. If they are normal, they are qualified. After the X-ray imaging unit 13 completes the inspection, the electromagnet 19 is powered off and the fixing unit 6 falls out and lands in the collection bucket.

[0040] The beneficial effects of this solution are as follows: 1. This solution performs a power-on test using the power supply unit 10, and then uses the judgment unit to determine whether abnormal heating is present. If, after eliminating surface components and solder joints, the power supply still generates normal heat, it is highly likely that the hidden solder joints are normal, eliminating the need for X-ray inspection, significantly saving time and improving overall inspection efficiency. 2. This mechanism disables the suction cup 15 by detecting abnormal heating of the electronic component 5, facilitating the movement of the fixed unit 6 by the moving mechanism. 3. This mechanism achieves the effect of gripping, moving, and placing the device using the electromagnet 19 and electric cylinder 14, thus saving costs. 4. This mechanism determines whether normal heating is present using the contact sensor 20, replacing existing thermal imaging detection devices and saving costs. The contact sensor 20 also serves as a positioning device, facilitating the securement of the fixed unit 6. 5. The linkage between the power supply unit 10 and the contact sensor 20 ensures that the contact sensor 20 is energized only when the power supply unit 10 is present; it is inoperative at all other times, preventing the disorganization of multiple contact sensors 20.

[0041] This solution also provides a 5AOI inspection method for automotive electronic components, including the following steps:

[0042] Step S10: The operator fixes the electronic component 5 on the fixing block, and then fixes the fixing block on the conveyor belt 7 through the suction cup 15;

[0043] Step S20: The operator starts the conveyor belt 7, and the electronic component 5 enters the AOI camera unit area. The conveyor belt 7 stops running, and the AOI camera unit performs a round of inspection. If it passes, it enters the next round of inspection. If it fails, it is marked by the marking unit 11 and then directly transported out through the conveyor belt 7;

[0044] Step S30: After a round of inspection, qualified products stop at the power-on unit 10 under the transportation of the conveyor belt 7. The power-on unit 10 is energized. If the heat is abnormal, it is sent to the X-ray camera unit 13 for inspection to determine whether the hidden solder joints are abnormal. If the solder joints are abnormal, they are marked by the marking unit 11. If they are normal, they are qualified products.

[0045] This method does not require all products to be inspected by X-ray, thus saving time and improving efficiency.

[0046] The above are only embodiments of the present invention. Common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An AOI inspection device for automotive electronic components, comprising: Box (1): the box (1) is provided with a control panel (3); Conveyor belt (7): the conveyor belt (7) cooperates with the box (1), and the conveyor belt (7) is used to transport the electronic components (5); AOI camera unit: the AOI camera unit is located inside the box (1), and the AOI camera unit is used to detect the electronic component (5); X-ray imaging unit: the X-ray imaging unit is used to detect the shielded portion of the electronic component (5); Fixing unit (6): the fixing unit (6) is used to fix the electronic component (5), and the fixing unit (6) cooperates with the conveyor belt (7); Processor (2): the processor (2) is fixedly connected to the box (1), and the conveyor belt (7), the AOI camera unit and the X-ray camera unit are all electrically connected to the processor (2); It is characterized by further comprising: Power supply unit (10): the power supply unit is used to supply power to the electronic component (5); Judgment unit: the judgment unit is used to judge whether the electronic component (5) is heating abnormally; The AOI imaging unit, the power supply unit (10), the judgment unit and the X-ray imaging unit are connected in sequence; The apparatus further includes a moving mechanism, wherein the moving mechanism moves the fixing unit (6) to the X-ray imaging unit, the moving mechanism is electrically connected to the processor (2), the fixing unit (6) includes a fixing block, a buckle (18) and a suction cup (15), the buckle (18) is rotatably connected to the fixing block, the suction cup (15) is fixedly connected to the fixing block, and the suction cup (15) cooperates with the conveyor belt (7); It also includes a piston (23) and a spring (24), the fixed block is provided with an inner groove, the piston (23) is connected to the inner groove in a sliding and sealing manner, and the piston (23) divides the inner groove into a cavity (16) and a working medium cavity (17), the working medium cavity (17) is provided with a working medium, and the boiling point of the working medium is 70-80 ° C. The cavity (16) is communicated with the suction cup (15), and one end of the spring (24) is fixedly connected to the piston (23), and the other end is fixedly connected to the cavity (16).

2. The AOI inspection device for automotive electronic components according to claim 1, characterized in that: The moving mechanism comprises an electric cylinder (14) and an electromagnet (19); the fixed block is made of ferromagnetic material; the electric cylinder (14) is fixedly connected to the box (1); the push rod of the electric cylinder (14) is fixedly connected to the electromagnet (19); the electromagnet (19) cooperates with the fixed block; and the X-ray imaging unit cooperates with the electric cylinder (14).

3. The AOI inspection device for automotive electronic components according to claim 2, characterized in that: The judgment unit is a contact sensor (20), the contact sensor (20) is fixedly connected to the conveyor belt (7), and the contact sensor (20) is electrically connected to the processor (2).

4. The AOI inspection device for automotive electronic components according to claim 1, characterized in that: The working fluid is ethanol, and the boiling point of ethanol is 78.4°C.

5. An AOI inspection method for automotive electronic components, characterized in that: The AOI inspection device for automotive electronic components according to any one of claims 1 to 4 is used for inspection, comprising the following steps: Step S10: The operator fixes the electronic component (5) on the fixing block, and then fixes the fixing block on the conveyor belt (7) through the suction cup (15); Step S20: The operator starts the conveyor belt (7), and the electronic component (5) enters the AOI camera unit area. The conveyor belt (7) stops running, and the AOI camera unit performs a round of inspection. If it is qualified, it enters the next round of inspection. If it is unqualified, it is marked by the marking unit (11) and then directly transported out through the conveyor belt (7); Step S30: The qualified products of one round of inspection are transported by the conveyor belt (7) and stopped at the power supply unit (10). The power supply unit (10) is energized. If the heating is abnormal, it is sent to the X-ray imaging unit (13) for inspection to determine whether the hidden solder joint is abnormal. If the solder joint is abnormal, it is marked by the marking unit (11). If it is normal, it is a qualified product.

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