LED chip appearance detection device

Abstract

The application discloses a LED crystal grain appearance detection device, which comprises a support, a dust cover is fixedly connected to the upper surface of the support, a nozzle is fixedly connected to the inner upper surface of the dust cover, a seal is fixedly connected to the inner upper surface of the dust cover, a piston is slidably connected to the inside of the seal, an air inlet one-way valve and an air outlet one-way valve are arranged on the circumference of the seal, a connecting pipe is fixedly connected between one end of the air inlet one-way valve and the upper surface of the nozzle, a rotating rod is rotatably connected to the inside of the support, and a conveying belt is transmissionally connected between the circumferences of the rotating rod. In the application, the user can conveniently install the LED crystal grain and accurately send the LED crystal grain to the lower side of the detector, so that the detection can be automatically performed, the work intensity of the staff in detection is reduced, the efficiency of the staff in LED crystal grain detection is improved, and the surface of the LED crystal grain can be cleaned through the nozzle, so that the dust on the surface of the LED crystal grain is avoided, and the detection result is affected.

Description

Technical Field

[0001] The present invention relates to the technical field of detection equipment, and in particular to an LED die appearance detection device. Background Art

[0002] After LED dies are created on wafers, they must be inspected for visible defects such as cracks, chips, and black spots, as these defects can negatively impact the quality and performance of the LED. Because these types of defects vary and can appear in a variety of locations, high-speed inspection using rule-based machine vision is impossible. Furthermore, normal aberrations that do not affect LED quality can also occur, so the system must ignore these minor defects. Given the size and volume of LED dies processed daily, manual inspection is neither efficient nor practical.

[0003] LED die appearance inspection mainly focuses on the inspection of the integrity of the appearance of LED die. Currently, fully automatic appearance inspection equipment is usually used for appearance quality inspection. However, in the existing technology, LED die appearance inspection equipment has the following problems: when inspecting the appearance of LED die, dust covering the surface of LED die can easily affect the inspection results, and when performing blanking operations, workers are required to screen and place qualified and unqualified LED die. When a large number of LED die are required, it is easy to cause fatigue of the workers. Summary of the Invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide an LED chip appearance inspection device to solve the problem that when inspecting the appearance of LED chips, the dust covering the appearance of LED chips can easily affect the inspection results, and when performing the blanking operation, the staff are required to screen and place the qualified and unqualified LED chips. When a large number of LED chips are required, it is easy to cause fatigue of the staff.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] The top of the air filter is installed in the air filter housing, and the top of the air filter is installed in the air filter housing, and the bottom of the air filter housing is installed in the air filter housing, and the air filter housing is installed in the air filter housing, and the air filter housing is installed in the air filter housing, and the air filter housing is installed in the air filter housing, and the air filter housing is installed in the air filter housing, and the air filter housing is installed in the air filter housing, and the air filter housing is installed in the air filter housing, and the air filter housing is installed

[0007] Furthermore, the transmission mechanism includes a turntable rotatably connected to the upper surface of the dust cover, the upper surface of the turntable is rotatably connected to a connecting rod, and the other end of the connecting rod is rotatably connected to one end of the piston, one side of the bracket is rotatably connected to a driving wheel, and one end of the rotating rod is fixedly connected to a driven wheel.

[0008] Furthermore, the transmission mechanism also includes a first motor fixedly connected to one side of the dust cover, the output section of the first motor and the circumferential surface of the turntable are fixedly connected to a first pulley, the other output end of the motor is fixedly connected to a worm, one side of the dust cover is rotatably connected to a worm wheel, and the worm wheel and the worm are engaged with each other, the rotating end of the worm wheel and the rotating end of the driving wheel are fixedly connected to a second pulley, and the second pulleys and the first pulleys are connected by belt transmission.

[0009] Furthermore, the two ends of the limiting rod are respectively slidably connected inside the limiting groove, and the size of the limiting rod matches the size of the limiting groove, and the limiting groove includes an ascending section, a parallel section and a descending section.

[0010] Furthermore, a placement groove is provided inside the placement plate, and a spring is fixedly connected between the upper surface of the movable plate and the inner wall of the placement rack.

[0011] Furthermore, the blanking mechanism includes a second motor fixedly connected to one end of the dust cover, and the output end of the second motor is fixedly connected to a push plate.

[0012] Furthermore, a controller is fixedly connected to the front of the dust cover, a detector is fixedly connected to the inner upper surface of the dust cover, and the first motor, the second motor and the detector are all electrically connected to the controller.

[0013] Furthermore, a baffle is fixedly connected to the upper surface of the bracket, one end of the baffle and both sides of the placement rack are inclined with the same inclination angle, and the vertical section of the baffle is made of elastic material.

[0014] A method for detecting the appearance of LED chips, comprising the following steps:

[0015] S1: The controller drives the first motor, the second motor and the detector to power on;

[0016] S2: Place the seed LED chips in the corresponding placement slots inside the placement rack;

[0017] S3: The first motor drives the driving wheel through the transmission mechanism, which drives the driven wheel to rotate intermittently and move the placement rack to the bottom of the nozzle. The sealer sends a clean air flow through the connecting pipe to clean the surface of the LED die. After cleaning, the placement rack moves to the bottom of the detector for inspection. The detector uses machine vision to detect defects in the LED die. The machine vision includes an image acquisition unit and an image processing unit. The image acquisition unit captures an image of the LED die under inspection, and the image processing unit processes the image to ultimately obtain the defect status of the LED die.

[0018] S4: The detector analyzes whether the surface of the LED crystal is damaged. When the placement rack moves out of one end of the dust cover, the ejector pushes the LED crystal out. If the LED crystal is damaged, the second motor rotates to reverse the push plate and push the LED crystal to one side. If the LED crystal is not damaged, the second motor drives the push plate to rotate forward to push the LED crystal to the opposite side for collection.

[0019] Beneficial effects of the present invention:

[0020] 1. By providing a dust cover, a sealer, a driving wheel, a driven wheel and a transmission mechanism, the conveyor belt can be intermittently driven to transport the LED chips, thereby facilitating the user to install the LED chips and accurately delivering the LED chips to the bottom of the detector so that the detection can be automatically performed, reducing the workload of the staff and thus improving the efficiency of the staff's LED chip detection. In addition, the surface of the LED chips can be cleaned through the nozzle to prevent dust from affecting the detection results.

[0021] 2. By providing a placement rack and a feeding mechanism, during the inspection process, the LED crystals are positioned inside the placement slot to prevent movement. When the inspection is completed, the push rod drives the LED crystals to rise out of the placement slot, and the second motor drives the push plate to rotate to screen qualified LED crystals, which facilitates loading and unloading operations and can automatically screen qualified LED crystals, thereby improving the efficiency of LED crystal inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a cross-sectional view of the internal structure of the present invention;

[0025] Figure 3 It is a structural sectional view of the placement rack of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the limiting plate of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the transmission mechanism of the present invention.

[0028] In the figure: 1. bracket; 2. rotating rod; 3. conveyor belt; 4. placement rack; 5. placement slot; 6. movable plate; 7. push rod; 8. limiting rod; 9. spring; 10. slide slot; 11. limiting plate; 12. limiting slot; 121. ascending section; 122. parallel section; 123. descending section; 13. first motor; 14. first pulley; 15. turntable; 16. connecting rod; 17. sealer; 18. piston; 19. exhaust check valve; 20. connecting pipe; 21. nozzle; 22. worm; 23. intake check valve; 24. worm gear; 25. second pulley; 26. driving wheel; 27. driven wheel; 28. second motor; 29. ​​push plate; 30. baffle; 31. controller; 32. detector; 33. dust cover. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] An LED chip appearance inspection device includes a bracket 1, the upper surface of the bracket 1 is fixedly connected to a dust cover 33, the inner upper surface of the dust cover 33 is fixedly connected to a nozzle 21, the inner upper surface of the dust cover 33 is fixedly connected to a sealer 17, the interior of the sealer 17 is slidably connected to a piston 18, the circumferential surface of the sealer 17 is provided with an intake check valve 23 and an exhaust check valve 19, and a connecting pipe 20 is fixedly connected between one end of the intake check valve 23 and the upper surface of the nozzle 21, the interior of the bracket 1 is rotatably connected to a rotating rod 2, and the rotating rod 2 A conveyor belt 3 is transmission-connected between the circumferential surfaces, a plurality of placement racks 4 are fixedly connected to the upper surface of the conveyor belt 3, a movable plate 6 is slidingly connected inside the placement rack 4, a limiting rod 8 is provided at one end of the movable plate 6, a top rod 7 is fixedly connected to the upper surface of the movable plate 6, a limiting plate 11 is fixedly connected to the upper surface of the bracket 1, a limiting groove 12 is provided inside the limiting plate 11, a transmission mechanism is provided on the inner and outer surfaces of the dust cover 33, the piston 18 drives the rotating rod 2 to rotate intermittently through the transmission mechanism, and a blanking mechanism is provided at one end of the dust cover 33.

[0031] Preferably, the transmission mechanism includes a turntable 15 rotatably connected to the upper surface of the dust cover 33, the upper surface of the turntable 15 is rotatably connected to a connecting rod 16, and the other end of the connecting rod 16 is rotatably connected to one end of the piston 18, one side of the bracket 1 is rotatably connected to a driving wheel 26, and one end of the rotating rod 2 is fixedly connected to a driven wheel 27.

[0032] Preferably, the transmission mechanism also includes a first motor 13 fixedly connected to one side of the dust cover 33, the output section of the first motor 13 and the circumferential surface of the turntable 15 are fixedly connected to the first pulley 14, and the other output end of the motor is fixedly connected to the worm 22.

[0033] Preferably, one side of the dust cover 33 is rotatably connected to a worm gear 24, and the worm gear 24 and the worm 22 are meshed with each other, and the rotating end of the worm gear 24 and the rotating end of the drive wheel 26 are fixedly connected to the second pulley 25, and the second pulleys 25 and the first pulley 14 are connected by a belt drive. By providing a dust cover, a sealer, a drive wheel, a driven wheel and a transmission mechanism, the transport belt can be intermittently driven to transport the LED grains, thereby facilitating the user to install the LED grains and accurately delivering the LED grains to the bottom of the detector so that they can be automatically detected.

[0034] Preferably, both ends of the limiting rod 8 are slidably connected inside the limiting groove 12 , and the size of the limiting rod 8 matches the size of the limiting groove 12 . The limiting groove 12 includes an ascending section 121 , a parallel section 122 and a descending section 123 .

[0035] Preferably, a placement groove 5 is provided inside the placement plate, and a spring 9 is fixedly connected between the upper surface of the movable plate 6 and the inner wall of the placement rack 4.

[0036] Preferably, the unloading mechanism includes a second motor 28 fixedly connected to one end of the dust cover 33 , and an output end of the second motor 28 is fixedly connected to a push plate 29 .

[0037] Preferably, the front of the dust cover 33 is fixedly connected to the controller 31 , the inner upper surface of the dust cover 33 is fixedly connected to the detector 32 , and the first motor 13 , the second motor 28 , and the detector 32 are all electrically connected to the controller 31 .

[0038] Preferably, a baffle 30 is fixedly connected to the upper surface of the bracket 1, one end of the baffle 30 and both sides of the placement rack 4 are inclined, and the inclination angles are the same, and the vertical section of the baffle 30 is made of elastic material.

[0039] See also Figure 1-5 As shown, an LED chip appearance inspection device includes a bracket 1, the upper surface of the bracket 1 is fixedly connected to a dust cover 33, the inner upper surface of the dust cover 33 is fixedly connected to a nozzle 21, the inner upper surface of the dust cover 33 is fixedly connected to a sealer 17, the interior of the sealer 17 is slidably connected to a piston 18, the circumferential surface of the sealer 17 is provided with an intake check valve 23 and an exhaust check valve 19, and a connecting pipe 20 is fixedly connected between one end of the intake check valve 23 and the upper surface of the nozzle 21, the interior of the bracket 1 is rotatably connected to a rotating rod 2, and the rotating rod 2 is transmission-connected with a conveyor belt 3, a plurality of placement racks 4 are fixedly connected to the upper surface of the conveyor belt 3, a movable plate 6 is slidingly connected inside the placement rack 4, a limiting rod 8 is provided at one end of the movable plate 6, a top rod 7 is fixedly connected to the upper surface of the movable plate 6, the upper surface of the bracket 1 is fixedly connected to the limiting plate 11, a limiting groove 12 is provided inside the limiting plate 11, a transmission mechanism is provided on the inner and outer surfaces of the dust cover 33, the piston 18 drives the rotating rod 2 to rotate intermittently through the transmission mechanism, and a blanking mechanism is provided at one end of the dust cover 33.

[0040] When using the device, the first motor 13, the second motor 28 and the detector 32 are driven by the controller 31 to work, the user places the LED crystal grain in the placing groove 5, the first motor 13 drives the belt wheel and the first belt wheel 14 to drive the rotating disc 15 to drive the connecting rod 16 to rotate the rod 2, the connecting rod 16 drives the piston 18 to reciprocate in the sealer 17, when the piston 18 moves upward, the air inlet one-way valve 23 opens, the air outlet one-way valve 19 closes, the external air is filtered by the filter screen at one end and enters the sealer 17, when the piston 18 moves downward, the air inlet one-way valve 23 closes, the air outlet one-way valve 19 opens, the compressed air is sent to the nozzle 21 through the connecting pipe 20, at this time, the motor drives the worm 22 to rotate, the worm 22 and the worm wheel 24 are engaged and are driven by the second belt wheel 25 and the belt to drive the driving wheel 26 to rotate, the driving wheel 26 drives the driven wheel 27 to rotate intermittently, the rod 2 drives the conveying belt 3 to move intermittently, the conveying belt 3 moves the LED crystal grain in the placing rack 4 to the lower side of the nozzle 21, the nozzle 21 sprays the compressed air to clean the surface of the LED crystal grain, when the conveying belt 3 rotates again, the LED crystal grain is sent to the lower side of the detector 32 to be detected, after the detection is completed, the conveying belt 3 drives the placing rack 4 to move to the lower side of the push plate 29, at this time, the limiting rod 8 moves to the parallel section 122 from the rising section 121 in the limiting groove 12, the limiting rod 8 drives the top rod 7 above the moving plate 6 to rise, the top rod 7 drives the LED crystal grain to rise and separate from the placing groove 5, at this time, the controller 31 controls the second motor 28 to drive the push plate 29 to rotate, according to the detection result of the LED crystal grain, the push plate 29 is controlled to rotate forward and reversely to push the LED crystal grain to the baffle 30 to be collected, which facilitates the cleaning operation of the surface of the LED crystal grain and the discharging operation of the LED crystal grain, reduces the operation strength of the workers, and improves the detection efficiency.

[0041] The transmission mechanism comprises the rotating disc 15 rotatably connected to the upper surface of the dust cover 33, the upper surface of the rotating disc 15 is rotatably connected with the connecting rod 16, and the other end of the connecting rod 16 is rotatably connected with one end of the piston 18, which facilitates the reciprocating movement of the piston 18 in the sealer 17, one side of the bracket 1 is rotatably connected with the driving wheel 26, and one end of the rod 2 is fixedly connected with the driven wheel 27, which facilitates the intermittent rotation of the conveying belt 3 on the surface of the rod 2.

[0042] The transmission mechanism also includes a first motor 13 fixedly connected to one side of the dust cover 33, and the output section of the first motor 13 and the circumferential surface of the turntable 15 are fixedly connected to the first pulley 14, and the other output end of the motor is fixedly connected to the worm 22, and one side of the dust cover 33 is rotatably connected to the worm wheel 24, and the worm wheel 24 and the worm 22 are engaged with each other, and the rotating end of the worm wheel 24 and the rotating end of the driving wheel 26 are fixedly connected to the second pulley 25, and the second pulley 25 and the first pulley 14 are connected by belt transmission, which facilitates the movement of the turntable 15 while driving the driving wheel 26 to rotate synchronously.

[0043] The two ends of the limiting rod 8 are respectively slidably connected inside the limiting groove 12, and the size of the limiting rod 8 matches the size of the limiting groove 12. The limiting groove 12 includes an ascending section 121, a parallel section 122 and a descending section 123. When the limiting rod 8 moves through the ascending section 121 to the parallel section 122, it can drive the top rod 7 above the movable plate 6 to rise to push out the LED grains for convenient unloading operations. When the limiting rod 8 moves from the parallel section 122 to the descending section 123, the movable plate 6 drives the top rod 7 to reset, thereby facilitating the user to place the LED grains.

[0044] A placement groove 5 is provided inside the placement plate to facilitate the positioning and placement of LED chips. A spring 9 is fixedly connected between the upper surface of the movable plate 6 and the inner wall of the placement rack 4 to facilitate driving the limiting rod 8 to slide to the inside of the rising section 121.

[0045] The unloading mechanism includes a second motor 28 fixedly connected to one end of the dust cover 33. The output end of the second motor 28 is fixedly connected to a push plate 29. The second motor 28 rotates to reverse the push plate 29 to push the LED grains to one side. When the LED grains are not damaged, the second motor 28 drives the push plate 29 to rotate forward to push the LED grains to the opposite side for collection.

[0046] A controller 31 is fixedly connected to the front of the dust cover 33, and a detector 32 is fixedly connected to the inner upper surface of the dust cover 33. The first motor 13, the second motor 28, and the detector 32 are all electrically connected to the controller 31. The detector 32 is a prior art that uses machine vision to detect defects in LED grains. The machine vision includes an image acquisition unit and an image processing unit. The image of the LED grain being tested is collected by the image acquisition unit, and then the image processing unit processes the image to finally obtain the defect status of the LED grain.

[0047] A baffle 30 is fixedly connected to the upper surface of the bracket 1. One end of the baffle 30 and both sides of the placement rack 4 are inclined with the same inclination angle. The vertical section of the baffle 30 is made of elastic material, which facilitates the sliding and falling of the LED grains and is blocked by the elastic end to facilitate the collection operation.

[0048] A method for detecting the appearance of LED chips, comprising the following steps:

[0049] S1: The controller 31 drives the first motor 13, the second motor 28, and the detector 32 to power on;

[0050] S2: Position the seed LED die corresponding to the placement slot 5 and place it inside the placement rack 4;

[0051] S3: The first motor 13 drives the driving wheel 26 through the transmission mechanism, which drives the driven wheel 27 to rotate intermittently to move the placement rack 4 to the bottom of the nozzle 21. The sealer 17 sends a clean air flow through the connecting pipe 20 to clean the surface of the LED die. After cleaning, the placement rack 4 moves to the detector 32 for inspection. The detector 32 uses machine vision to detect defects in the LED die. The machine vision includes an image acquisition unit and an image processing unit. The image acquisition unit captures an image of the LED die under inspection, and the image processing unit processes the image to ultimately obtain the defect status of the LED die.

[0052] S4: The detector 32 analyzes whether the surface of the LED crystal is damaged. When the placement rack 4 moves out of one end of the dust cover 33, the push rod 7 pushes the LED crystal out. When the LED crystal is damaged, the second motor 28 rotates to reverse the push plate 29 to push the LED crystal to one side. When the LED crystal is not damaged, the second motor 28 drives the push plate 29 to rotate forward to push the LED crystal to the opposite side for collection.

[0053] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0054] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A device for detecting the appearance of LED chips, characterized in that: The invention comprises a bracket (1), wherein the upper surface of the bracket (1) is fixedly connected to a dust cover (33), the inner upper surface of the dust cover (33) is fixedly connected to a nozzle (21), the inner upper surface of the dust cover (33) is fixedly connected to a sealer (17), the interior of the sealer (17) is slidably connected to a piston (18), the circumferential surface of the sealer (17) is provided with an intake check valve (23) and an exhaust check valve (19), and a connecting pipe (20) is fixedly connected between one end of the intake check valve (23) and the upper surface of the nozzle (21), the interior of the bracket (1) is rotatably connected to a rotating rod (2), and the circumferential surfaces of the rotating rod (2) are used for transmission. A conveyor belt (3) is connected, a plurality of placement racks (4) are fixedly connected to the upper surface of the conveyor belt (3), a movable plate (6) is slidably connected inside the placement rack (4), a limiting rod (8) is provided at one end of the movable plate (6), a top rod (7) is fixedly connected to the upper surface of the movable plate (6), a limiting plate (11) is fixedly connected to the upper surface of the bracket (1), a limiting groove (12) is provided inside the limiting plate (11), a transmission mechanism is provided on the inner outer surface of the dust cover (33), the piston (18) drives the rotating rod (2) to rotate intermittently through the transmission mechanism, and a blanking mechanism is provided at one end of the dust cover (33); The two ends of the limiting rod (8) are respectively slidably connected inside the limiting groove (12), and the size of the limiting rod (8) matches the size of the limiting groove (12), and the limiting groove (12) includes an ascending section (121), a parallel section (122) and a descending section (123); A placement groove (5) is provided inside the placement rack, and a spring (9) is fixedly connected between the upper surface of the movable plate (6) and the inner wall of the placement rack (4); The unloading mechanism comprises a second motor (28) fixedly connected to one end of the dust cover (33), and an output end of the second motor (28) is fixedly connected to a push plate (29); The front of the dust cover (33) is fixedly connected to a controller (31), the inner upper surface of the dust cover (33) is fixedly connected to a detector (32), and the first motor (13), the second motor (28), and the detector (32) are all electrically connected to the controller (31); A baffle (30) is fixedly connected to the upper surface of the bracket (1), one end of the baffle (30) and both sides of the placement rack (4) are inclined at the same angle, and the vertical section of the baffle (30) is made of elastic material.

2. The LED die appearance inspection device according to claim 1, characterized in that: The transmission mechanism includes a turntable (15) rotatably connected to the upper surface of the dust cover (33), the upper surface of the turntable (15) is rotatably connected to a connecting rod (16), and the other end of the connecting rod (16) is rotatably connected to one end of a piston (18), one side of the bracket (1) is rotatably connected to a driving wheel (26), and one end of the rotating rod (2) is fixedly connected to a driven wheel (27).

3. The LED die appearance inspection device according to claim 2, characterized in that: The transmission mechanism further comprises a first motor (13) fixedly connected to one side of the dust cover (33), an output section of the first motor (13) and a circumferential surface of the turntable (15) are both fixedly connected to a first pulley (14), and the other output end of the motor is fixedly connected to a worm (22).

4. The LED die appearance inspection device according to claim 3, characterized in that: One side of the dust cover (33) is rotatably connected to a worm wheel (24), and the worm wheel (24) and the worm (22) are meshed with each other. The rotating end of the worm wheel (24) and the rotating end of the driving wheel (26) are both fixedly connected to a second pulley (25), and the second pulleys (25) and the first pulleys (14) are connected via a belt transmission.

5. A method for detecting an LED die appearance based on the LED die appearance detection device according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: driving the first motor (13), the second motor (28), and the detector (32) through the controller (31) to conduct power-on operation; S2: Positioning the seed LED crystals in the corresponding placement slots (5) and placing them inside the placement rack (4); S3: The first motor (13) drives the driving wheel (26) through the transmission mechanism to drive the driven wheel (27) to rotate intermittently to send the placement rack (4) to the bottom of the nozzle (21), and the sealer (17) sends a clean air flow through the connecting pipe (20) to clean the surface of the LED grain. After the cleaning is completed, the placement rack (4) moves to the detector (32) for detection. The detector (32) uses machine vision to detect defects in the LED grain. The machine vision includes an image acquisition unit and an image processing unit. The image acquisition unit collects an image of the LED grain to be tested, and then the image processing unit processes the image to finally obtain the defect status of the LED grain. S4: The detector (32) analyzes whether the surface of the LED crystal grain is damaged. When the placement rack (4) moves out of one end of the dust cover (33), the push rod (7) pushes the LED crystal grain out. When the LED crystal grain is damaged, the second motor (28) rotates to reverse the push plate (29) to push the LED crystal grain to one side. When the LED crystal grain is not damaged, the second motor (28) drives the push plate (29) to rotate forward to push the LED crystal grain to the opposite side for collection.

Images