A MiniLED Appearance Defect Detection System

Abstract

The present invention is applicable to the technical field of MiniLED appearance detection, and provides a MiniLED appearance defect detection system, including a detection rack, a placement rack and a plurality of LED lamp beads; the placement rack includes a U-shaped plate; an L-shaped plate is fixed to the bottom surface of the U-shaped plate; a chute for slidingly mating with the positive electrode welding foot and the negative electrode welding foot is provided on the surface of the support plate; an annular groove communicating with the chute is provided on the surface of the fixed table; the positive electrode welding foot and the negative electrode welding foot on the corresponding LED lamp bead are rotatably arranged in the annular groove; vertical plates are symmetrically fixed to the bottom surface of the fixed table; an L-shaped strip is fixed to the side surface of the L-shaped plate; a lifting member that is slidably arranged on the surface of the L-shaped strip and slidably mates with each pair of opposite vertical plates is provided. Through the linkage cooperation between the various components, the LED lamp beads adsorbed in the rotating tube are replaced in terms of the positive and negative positions, so that the positive electrode welding feet and the negative electrode welding feet of the LED lamp beads in the same placement rack are all arranged in the same direction, facilitating the subsequent rapid detection of the appearance defects of the LED lamp beads.

Description

Technical Field

[0001] The present invention relates to the technical field of optical detection, and more specifically, it relates to a MiniLED appearance defect detection system. Background Art

[0002] LED devices with chip sizes between 50 and 200 μm are called MiniLEDs, which are the result of the continuous reduction of the size of small-pitch LEDs. MiniLED technology is mature and mass production is feasible, and it is expected to be widely used in the backlight of medium and high-end liquid crystal display screens and LED displays. With the rapid development of MiniLED display technology, MiniLED display products have begun to be applied to ultra-large screen high-definition displays, such as commercial fields such as monitoring and command, high-definition studio, high-end cinema, medical diagnosis, advertising display, conference and exhibition, office display, virtual reality, etc.

[0003] In terms of controlling the ex-factory quality of products, machine vision inspection is the main direction of industrial inspection. Since defects and errors are inevitably generated during production, resulting in defective parts or products. Therefore, an inspection link is required at the back end of the assembly line. Since the front and the periphery of the wafer of the LED lamp beads need to be inspected for appearance during the production of the existing MiniLED tape, during the inspection process, the positive and negative solder feet of the LED lamp beads are conducted with the probes for appearance inspection. However, due to the uncertainty of the placement positions of the positive and negative solder feet of the LED lamp beads during the appearance inspection process, the efficiency of appearance defect detection is reduced. At the same time, it is impossible to inspect and screen products with defects or dirt on the front and the periphery of the wafer of the LED lamp beads, resulting in the situation that the appearance of the inspected LED lamp bead products has defects. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a MiniLED appearance defect detection system. By putting each group of LED lamp beads to be detected into the chute one by one, under the action of gravity, adjacent LED lamp beads are mutually attached, and each LED lamp bead is coaxially arranged with the corresponding annular groove. By controlling the lifting member to rise, the LED lamp beads with the positive and negative solder feet reversed are jacked up and sent into the corresponding rotating tubes, and are sucked tightly by negative pressure. Control each group of rotating tubes to rotate synchronously by 180°, so as to realize the replacement of the positive and negative positions of the LED lamp beads adsorbed in the rotating tubes, so that the positive and negative solder feet of the LED lamp beads in the same placement rack are all arranged in the same direction, which is convenient for subsequent rapid detection of the appearance defects of the LED lamp beads and improves the detection efficiency.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A MiniLED appearance defect detection system, comprising a detection rack, a placement rack uniformly fixed on the detection rack, and a plurality of LED lamp beads slidably arranged on the placement rack; the LED lamp beads include lamp bead bodies; positive welding feet and negative welding feet are respectively welded on both sides of the front surface of the lamp bead bodies; the placement rack includes a U-shaped plate; an L-shaped plate is fixed on the bottom surface of the U-shaped plate; baffles are fixedly arranged at both ends of the U-shaped plate and inclined downward; a support plate is arranged at the end of the L-shaped plate and inclined downward; a chute for slidingly cooperating with the positive welding feet and negative welding feet is formed on the surface of the support plate; a plurality of fixing platforms are uniformly fixed on the surface of the support plate; an annular groove communicating with the chute is formed on the surface of the fixing platform; the positive welding feet and negative welding feet corresponding to the LED lamp beads are rotatably arranged in the annular groove; vertical plates are symmetrically fixed on the bottom surface of the fixing platform; an L-shaped strip is fixed on the side surface of the L-shaped plate; each vertical plate is fixed on the surface of the L-shaped strip; a lifting member slidably arranged on the surface of the L-shaped strip and slidably cooperating with each pair of opposite vertical plates is provided.

[0007] The present invention is further arranged as follows: a guiding groove is formed on the side surface of the vertical plate; a fixing plate is fixed between the two opposite vertical plates; the lifting member includes a bottom plate; a plurality of threaded sleeves are uniformly fixed on the surface of the bottom plate; a screw rod is screwed in the threaded sleeve; the top of the screw rod is fixed with a slider slidably cooperating with the corresponding pair of guiding grooves; a return spring is fixed between the top of the slider and the bottom surface of the fixing plate.

[0008] The present invention is further arranged as follows: a plastic body is filled and arranged inside the lamp bead body; a wafer is arranged inside the plastic body; gold wires are electrically connected to both ends of the wafer; both ends of the wafer are connected to the positive welding feet and negative welding feet through gold wires respectively; a first L-shaped rod is fixed on one side surface of the slider, and a second L-shaped rod is fixed on the other opposite side surface; the height of the first L-shaped rod is higher than that of the second L-shaped rod; the height of the first L-shaped rod is consistent with the length of the positive welding foot; the height of the second L-shaped rod is consistent with the length of the negative welding foot.

[0009] The present invention is further arranged as follows: a first iron block is fixed on the bottom surface of the bottom plate; a first electromagnetic chuck is fixed on the surface of the L-shaped strip; a micro electric control box is fixedly installed between the U-shaped plate and the L-shaped plate through a fastening bolt; a control module is arranged inside the micro electric control box; the output end of the control module is electrically connected to the first electromagnetic chuck; a light-shielding plate is pasted on the side surface of the L-shaped strip; the detection rack includes a mounting plate; mounting legs are fixed on the surface of the mounting plate, and a first extension plate and a second extension plate are sequentially fixed on the circumferential side surface thereof; a connecting plate is fixedly arranged at the end of the first extension plate and inclined downward; a Z-shaped plate is fixed on the side surface of the connecting plate; an infrared travel switch electrically connected to the input end of the control module is installed on the side surface of the Z-shaped plate; pressure sensing probes electrically connected to the input end of the control module are arranged at the ends of the first L-shaped rod and the second L-shaped rod respectively.

[0010] The present invention is further configured such that: a plurality of rotating tubes with sealed tops are rotatably arranged through the surface of the connecting plate in a uniform manner; a partition is fixed to the inner wall of the rotating tube; a pressure sensor electrically connected to the input end of the control module is installed on the bottom surface of the partition; a plurality of first air holes are uniformly formed on the surface of the partition; an ear tube is rotatably and sealingly arranged at the top of the rotating tube; a positioning plate is fixed to the surface of the connecting plate; an air extraction pipe is fixedly arranged through the side surface of the positioning plate; each ear tube is fixed to the air extraction pipe and communicated with the air extraction pipe in a uniform manner; a ventilation pipe is communicated with the air extraction pipe; and a solenoid valve is arranged on the ventilation pipe.

[0011] The present invention is further configured such that: a mounting seat is fixed between the first extension plate and the second extension plate; a controller and an air extraction pump are sequentially fixed to the surface of the mounting seat; the air extraction end of the air extraction pump is connected to the air extraction pipe through a hose; a toothed ring is fixed to the circumferential side surface of the rotating tube; sliding sleeves are symmetrically fixed to the surface of the connecting plate; a toothed plate meshing with each toothed ring is slidably arranged between the two sliding sleeves; a guide tube is fixed to the side surface of the Z-shaped plate; a sliding rod is slidably arranged inside the guide tube; one end of the sliding rod is fixedly connected to the toothed plate, and a connecting spring is connected between the other end of the sliding rod and the guide tube; a third iron block is fixed to the end of the sliding rod; a third electromagnetic chuck electrically connected to the output end of the controller is fixed to the inner wall of the guide tube; and the output end of the controller is electrically connected to the air extraction pump and the solenoid valve respectively.

[0012] The present invention is further configured such that: a servo motor electrically connected to the output end of the controller is fixedly installed on the bottom surface of the mounting seat; a fixed disk is fixed to the output end of the servo motor; a plurality of first ear plates are uniformly fixed to the circumferential side surface of the fixed disk; a second ear plate is fixed to the side surface of the U-shaped plate; and the first ear plate and the second ear plate are fixedly connected through a fastening bolt.

[0013] The present invention is further configured such that: a plurality of screw holes are uniformly formed on the side surface of one baffle; a pressing member is screwed in the screw hole; the pressing member includes a piston cylinder; a piston is slidably arranged inside the piston cylinder; a compression spring is connected between the piston and the piston cylinder; a second iron block is fixed to the side surface of the piston; a second electromagnetic chuck electrically connected to the output end of the control module is fixed to the inner wall of the piston cylinder; an elastic diaphragm is arranged at the end of the piston cylinder; and a plurality of anti-slip protrusions are uniformly arranged on the outer surface of the elastic diaphragm.

[0014] The present invention is further configured such that: a U-shaped seat is fixed to the side surface of the second extension plate; limiting grooves are formed on both sides of the inner wall of the U-shaped plate; a sliding plate is slidably disposed between the two limiting grooves; support springs are symmetrically connected between the sliding plate and the U-shaped seat; a first armature iron column is fixed to the bottom surface of the sliding plate; a first electromagnetic coil electrically connected to the output end of the controller is installed on the inner bottom surface of the U-shaped seat; a cross plate is fixed to the end of the sliding plate; support plates are symmetrically fixed to both ends of the cross plate; a guide rod is fixed between the two opposite support plates; a second electromagnetic coil and a third electromagnetic coil electrically connected to the output end of the controller are sequentially installed between the two ends of the cross plate and adjacent support plates; a sliding box is slidably disposed between the two guide rods; mounting springs sleeved on the corresponding guide rods are fixedly connected between the sliding box and each support plate; a plurality of second air holes are uniformly formed on the bottom surface of the sliding box; the sliding box is connected to the air outlet end of the air extraction pump through a hose; a second armature iron column and a third armature iron column are sequentially installed on two opposite side surfaces of the sliding box.

[0015] The present invention is further configured such that: an image recognition module is fixedly installed on the side surface of the U-shaped seat; the image recognition module includes a high-definition camera and a recognition host electrically connected to the high-definition camera; a first inclined plate and a second inclined plate for placing qualified products and defective products are sequentially and obliquely downward installed on two opposite side surfaces of the U-shaped seat; mounting grooves for slidably fitting with the positive electrode welding feet and the negative electrode welding feet are formed on the surfaces of the first inclined plate and the second inclined plate; an electric push rod electrically connected to the output end of the controller is fixed to the side surface of the second inclined plate; a power-on seat is fixed to the telescopic end of the electric push rod; a positive electrode detection probe and a negative electrode detection probe are sequentially electrically connected to the surface of the power-on seat.

[0016] The advantages of the present invention are as follows:

[0017] 1. In the present invention, the LED lamp beads in the same placement rack are coaxially arranged with the corresponding annular grooves. By controlling the lifting member to rise, the LED lamp beads with the positive electrode welding feet and the negative electrode welding feet reversed are lifted and sent into the corresponding rotating tubes, and are sucked tightly by negative pressure. The groups of rotating tubes are controlled to rotate synchronously by 180°, so as to replace the positions of the positive and negative electrodes of the LED lamp beads adsorbed in the rotating tubes, so that the positive electrode welding feet and the negative electrode welding feet of the LED lamp beads in the same placement rack are all arranged in the same direction, which is convenient for subsequent rapid detection of the appearance defects of the LED lamp beads and improves the detection efficiency.

[0018] 2. When inspecting the appearance defects of the present invention, the fixed LED lamp beads are adsorbed by the sliding box, and the corresponding LED lamp beads are pulled out and aligned with the image recognition module. Then, the positive detection probe and the negative detection probe are controlled to extend and conduct with the positive welding foot and the negative welding foot, driving the chip arranged inside the LED lamp bead to light up. The chip releases light to illuminate the front of the LED lamp bead and the surrounding of the chip, enabling the camera to capture clear images of the front of the LED lamp bead and the surrounding of the chip, and storing them inside the host computer for the purpose of identifying and screening defective products, thereby improving the appearance quality of the inspected LED lamp bead products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a MiniLED appearance defect detection system of the present invention.

[0020] Figure 2 It is a schematic structural diagram of the detection rack of the present invention.

[0021] Figure 3 For the present invention Figure 2 Enlarged view of area A.

[0022] Figure 4 It is a schematic structural diagram of the detection rack of the present invention from another angle.

[0023] Figure 5 For the present invention Figure 4 Enlarged view of area B.

[0024] Figure 6 It is a schematic structural diagram of the placement rack of the present invention.

[0025] Figure 7 It is a schematic structural diagram of the placement rack of the present invention from a top view perspective.

[0026] Figure 8 For the present invention Figure 7 Enlarged view of area C.

[0027] Figure 9 It is a schematic structural diagram of the LED lamp bead of the present invention.

[0028] Figure 10 It is a schematic structural diagram of the pressing member of the present invention.

[0029] Figure 11 It is a schematic structural diagram of the lifting member of the present invention.

[0030] Figure 12 It is a schematic structural diagram of the assembly of the placement rack and the LED lamp bead of the present invention.

[0031] Figure 13 For the present invention Figure 1 Schematic structural diagram from a front view perspective.

[0032] Figure 14 For the present invention Figure 13 Enlarged view of area D.

[0033] Figure 15 For the present invention Figure 1 Schematic structural diagram from another angle.

[0034] Figure 16 For the present invention Figure 15 Enlarged view of area E.

[0035] In the figure: 1, detection frame; 2, placement frame; 3, LED lamp beads; 4, lamp bead body; 5, positive electrode welding foot; 6, negative electrode welding foot; 7, U-shaped plate; 8, L-shaped plate; 9, support plate; 10, sliding groove; 11, fixed table; 12, annular groove; 13, vertical plate; 14, L-shaped strip; 15, lifting member; 16, guiding groove; 17, fixing plate; 18, bottom plate; 19, threaded sleeve; 20, slider; 21, return spring; 22, plastic body; 23, chip; 24, gold wire; 25, first L-shaped rod; 26, second L-shaped rod; 27, first iron block; 28, first electromagnetic chuck; 29, micro electric control box; 30, light-shielding plate; 31, mounting plate; 32, mounting leg; 33, first extension plate; 34, second extension plate; 35, connecting plate; 36, Z-shaped plate; 37, infrared travel switch; 38, rotating tube; 39, partition; 40, first air hole; 41, ear tube; 42, positioning plate; 43, air extraction pipe; 44, ventilation pipe; 45, solenoid valve; 46, mounting seat; 47, controller; 48, air extraction pump; 49, gear ring; 50, sliding sleeve; 51, toothed plate; 52, guiding tube; 53, sliding rod; 54, servo motor; 55, fixed disk; 56, first ear plate; 57, second ear plate; 58, screw hole; 59, pressing member; 60, piston cylinder; 61, piston; 62, extrusion spring; 63, second iron block; 64, second electromagnetic chuck; 65, elastic diaphragm; 66, U-shaped seat; 67, limiting groove; 68, sliding plate; 69, support spring; 70, first armature iron column; 71, first electromagnetic coil; 72, horizontal plate; 73, support plate; 74, guide rod; 75, second electromagnetic coil; 76, third electromagnetic coil; 77, sliding box; 78, second air hole; 79, second armature iron column; 80, third armature iron column; 81, image recognition module; 82, first inclined plate; 83, second inclined plate; 84, mounting groove; 85, electric push rod; 86, energized seat; 87, positive electrode detection probe; 88, negative electrode detection probe; 89, baffle; 90, mounting spring; 91, pressure sensor. Detailed implementation manners

[0036] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs.

[0038] In the present invention, unless otherwise stated, the orientations such as "upper" and "lower" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left" and "right" are usually in the left and right shown in the drawings; "inner" and "outer" refer to the inner and outer of the contours of the respective components, but the above orientation terms are not used to limit the present invention.

[0039] Embodiment 1. Please refer to Figure 1-16 , the present invention provides the following technical solutions:

[0040] A MiniLED appearance defect detection system. Specifically, it includes a detection rack 1, a placement rack 2 uniformly fixed on the detection rack 1, and a plurality of LED lamp beads 3 slidably arranged on the placement rack 2; the LED lamp beads 3 include a lamp bead body 4; on both sides of the front surface of the lamp bead body 4, a positive electrode welding foot 5 and a negative electrode welding foot 6 are respectively welded; the placement rack 2 includes a U-shaped plate 7; an L-shaped plate 8 is fixed on the bottom surface of the U-shaped plate 7; baffles 89 are fixed at both ends of the U-shaped plate 7 and inclined downward; a support plate 9 is arranged at the end of the L-shaped plate 8 and inclined downward; a sliding groove 10 for slidingly cooperating with the positive electrode welding foot 5 and the negative electrode welding foot 6 is formed on the surface of the support plate 9; a plurality of fixing platforms 11 are uniformly fixed on the surface of the support plate 9; an annular groove 12 communicating with the sliding groove 10 is formed on the surface of the fixing platform 11; the positive electrode welding foot 5 and the negative electrode welding foot 6 corresponding to the LED lamp beads 3 are rotatably arranged in the annular groove 12; vertical plates 13 are symmetrically fixed on the bottom surface of the fixing platform 11; an L-shaped strip 14 is fixed on the side surface of the L-shaped plate 8; each vertical plate 13 is fixed on the surface of the L-shaped strip 14; a lifting member 15 slidably arranged on the surface of the L-shaped strip 14 and slidably cooperating with each pair of opposite vertical plates 13 is provided.

[0041] Working principle of the first embodiment: By putting each group of LED beads 3 to be detected into the chute 10 one by one, the positive electrode welding feet 5 and the negative electrode welding feet 6 slide in the chute 10. Under the action of gravity, adjacent LED beads 3 are in contact with each other, and each LED bead 3 is coaxially arranged with the corresponding annular groove 12. At this time, the positive electrode welding feet 5 and the negative electrode welding feet 6 on each group of LED beads 3 are placed in the corresponding annular groove 12. By controlling the lifting member 15 to rise, the LED beads 3 with the positive electrode welding feet 5 and the negative electrode welding feet 6 reversed are lifted and sent into the corresponding rotating tube 38, and are sucked tightly by negative pressure. By controlling each group of rotating tubes 38 to rotate synchronously by 180°, the positions of the positive electrode welding feet 5 and the negative electrode welding feet 6 of the LED beads 3 adsorbed in the rotating tube 38 are replaced, so that the positive electrode welding feet 5 and the negative electrode welding feet 6 of the LED beads 3 in the same placement rack 2 are all arranged in the same direction, which is convenient for subsequent rapid detection of the appearance defects of the LED beads 3 and improves the detection efficiency.

[0042] For the second embodiment, please refer to Figure 1-16, in the second embodiment, the following improvements are made on the basis of the first embodiment. Specifically, a guide groove 16 is formed on the side surface of the vertical plate 13; a fixing plate 17 is fixed between two opposite vertical plates 13; the lifting member 15 includes a bottom plate 18; a plurality of threaded sleeves 19 are uniformly fixed on the surface of the bottom plate 18; a screw rod is screwed in the threaded sleeve 19; a slider 20 that is slidably engaged with the corresponding two opposite guide grooves 16 is fixed at the top of the screw rod; a return spring 21 is fixed between the top of the slider 20 and the bottom surface of the fixing plate 17; a plastic body 22 is filled and arranged inside the lamp bead body 4; a chip 23 is arranged inside the plastic body 22; gold wires 24 are electrically connected to both ends of the chip 23; both ends of the chip 23 are connected to the positive electrode welding leg 5 and the negative electrode welding leg 6 through the gold wires 24; a first L-shaped rod 25 is fixed on one side surface of the slider 20, and a second L-shaped rod 26 is fixed on the other opposite side surface thereof; the height of the first L-shaped rod 25 is higher than that of the second L-shaped rod 26; the height of the first L-shaped rod 25 is the same as the length of the positive electrode welding leg 5; the height of the second L-shaped rod 26 is the same as the length of the negative electrode welding leg 6; a first iron block 27 is fixed on the bottom surface of the bottom plate 18; a first electromagnetic chuck 28 is fixed on the surface of the L-shaped strip 14; a micro electric control box 29 is fixedly installed between the U-shaped plate 7 and the L-shaped plate 8 through a fastening bolt; a control module is arranged inside the micro electric control box 29; the output end of the control module is electrically connected to the first electromagnetic chuck 28; a light shielding plate 30 is pasted on the side surface of the L-shaped strip 14; the detection frame 1 includes a mounting plate 31; mounting legs 32 are fixed on the surface of the mounting plate 31, and a first extension plate 33 and a second extension plate 34 are sequentially fixed on the peripheral side surface thereof; a connecting plate 35 is fixedly arranged at the end of the first extension plate 33 in an inclined downward manner; an infrared travel switch 37 that is electrically connected to the input end of the control module is installed on the side surface of the connecting plate 35; pressure sensing probes that are electrically connected to the input end of the control module are arranged at the ends of the first L-shaped rod 25 and the second L-shaped rod 26; a servo motor 54 that is electrically connected to the output end of the controller 47 is fixedly installed on the bottom surface of the mounting seat 46; a fixed disk 55 is fixed at the output end of the servo motor 54; a plurality of first ear plates 56 are uniformly fixed on the peripheral side surface of the fixed disk 55; a second ear plate 57 is fixed on the side surface of the U-shaped plate 7; the first ear plate 56 and the second ear plate 57 are fixedly connected through a fastening bolt.

[0043] Working principle of the second embodiment: Control the start of the servo motor 54 to drive the fixed disk 55 to rotate. When the light shielding plate 30 on a set of placement racks 2 rotates to block the infrared travel switch 37, the infrared travel switch 37 transmits a signal to the controller 47. The controller 47 controls the servo motor 54 to stop. The controller 47 is communicatively connected to each control module. At the same time, control the first electromagnetic chuck 28 to lose power. Under the elastic reset force of the reset spring 21, drive the lifting member 15 to rise. Along the length direction of the baffle 89, the positive electrode welding foot 5 on the LED lamp bead 3 is on the right and the negative electrode welding foot 6 is on the left. Such an LED lamp bead 3 is in the correct placement position. When the positive electrode welding foot 5 is on the left and the negative electrode welding foot 6 is on the right, it is in the reversed state. When the lifting member 15 rises, the positive electrode welding foot 5 on the LED lamp bead 3 in the reversed state contacts the corresponding first L-shaped rod 25 first. The pressure sensing probe on the corresponding first L-shaped rod 25 is triggered first. The corresponding second L-shaped rod 26 never contacts the corresponding negative electrode welding foot 6. During the rising process of the lifting member 15, the LED lamp beads 3 in the reversed state in each group are synchronously lifted. The lifted LED lamp beads 3 are inserted into the corresponding rotating tubes 38, while the LED lamp beads 3 in the correct placement state remain stationary, completing the rapid positioning and extraction of the LED lamp beads 3 in the reversed state.

[0044] Embodiment 3. Please refer to Figure 1-16 , on the basis of Embodiment 2, the following improvements are made in Embodiment 3. Specifically, a plurality of rotating tubes 38 with sealed tops are uniformly and rotatably arranged through the surface of the connecting plate 35; a partition 39 is fixed on the inner wall of the rotating tube 38; a pressure sensor 91 electrically connected to the input end of the control module is installed on the bottom surface of the partition 39; a plurality of first air holes 40 are uniformly formed on the surface of the partition 39; an ear tube 41 is rotatably and sealingly arranged on the top of the rotating tube 38; a positioning plate 42 is fixed on the surface of the connecting plate 35; an air extraction tube 43 is fixedly arranged through the side surface of the positioning plate 42; each ear tube 41 is fixed on the air extraction tube 43 and communicated with the air extraction tube 43 uniformly; an air vent tube 44 is communicated with the air extraction tube 43; a solenoid valve 45 is arranged on the air vent tube 44; a mounting seat 46 is fixed between the first extension plate 33 and the second extension plate 34; a controller 47 and an air extraction pump 48 are sequentially fixed on the surface of the mounting seat 46; the air extraction end of the air extraction pump 48 is connected to the air extraction tube 43 through a hose; a toothed ring 49 is fixed on the circumferential side surface of the rotating tube 38; sliding sleeves 50 are symmetrically fixed on the surface of the connecting plate 35; a toothed plate 51 meshing with each toothed ring 49 is slidably arranged between the two sliding sleeves 50; a guide tube 52 is fixed on the side surface of the Z-shaped plate 36; a sliding rod 53 is slidably arranged inside the guide tube 52; one end of the sliding rod 53 is fixedly connected to the toothed plate 51, and a connecting spring is connected between the other end of the sliding rod 53 and the guide tube 52; a third iron block is fixed at the end of the sliding rod 53; a third electromagnetic chuck electrically connected to the output end of the controller 47 is fixed on the inner wall of the guide tube 52; the output end of the controller 47 is electrically connected to the air extraction pump 48 and the solenoid valve 45 respectively.

[0045] Working principle of the third embodiment: The lifted LED lamp beads 3 are inserted into the corresponding rotating tubes 38, squeezing the corresponding pressure sensors 91. The corresponding pressure sensors 91 transmit signals to the controller 47, and the controller 47 controls the air pump 48 to start. A closed environment is formed between the lamp bead body 4 and the corresponding rotating tube 38, and the air inside is pumped away through the corresponding ear tubes 41 to form a negative pressure environment, thereby realizing the adsorption and fixation of the LED lamp beads 3 in the reversed state. Control the third electromagnetic chuck to be energized to attract the third iron block, so that the slide rod 53 is received into the guide tube 52, and the corresponding connecting spring is compressed, thereby driving the toothed plate 51 to slide, and then driving each group of rotating tubes 38 together with the corresponding LED lamp beads 3 to rotate 180°, realizing the synchronous rotation of each group of LED lamp beads 3 in the reversed state, so that the positive electrode welding foot 5 is on the left and the negative electrode welding foot 6 is on the right in the initial state is converted to the positive electrode welding foot 5 is on the right and the negative electrode welding foot 6 is on the left. After completion, control the air pump 48 to stop working and at the same time control the first electromagnetic chuck 28 to be energized, so that the lifting member 15 descends, and at the same time under the action of gravity, each group of LED lamp beads 3 descends synchronously. The positive electrode welding feet 5 and negative electrode welding feet 6 of the LED lamp beads 3 in the same placement rack 2 are arranged in the same direction, which is convenient for subsequent rapid detection of the appearance defects of the LED lamp beads 3 and improves the detection efficiency.

[0046] For the fourth embodiment, please refer to Figure 1-16 , on the basis of the third embodiment, the fourth embodiment is improved as follows. Specifically, a plurality of screw holes 58 are evenly opened on the side of a baffle 89; a pressing member 59 is screwed in the screw holes 58; the pressing member 59 includes a piston cylinder 60; a piston 61 is slidably arranged inside the piston cylinder 60; an extrusion spring 62 is connected between the piston 61 and the piston cylinder 60; a second iron block 63 is fixed on the side of the piston 61; a second electromagnetic chuck 64 electrically connected to the output end of the control module is fixed on the inner wall of the piston cylinder 60; an elastic diaphragm 65 is arranged at the end of the piston cylinder 60; a plurality of anti-slip protrusions are evenly arranged on the outer surface of the elastic diaphragm 65.

[0047] Working principle of the fourth embodiment: After the feeding of each group of LED lamp beads 3 is completed, the control module controls each group of second electromagnetic chucks 64 to lose power synchronously. Under the elastic reset force of the extrusion spring 62, the piston 61 is driven to move along the piston cylinder 60 towards the elastic diaphragm 65, so that the elastic diaphragm 65 is enlarged and pressed against the corresponding LED lamp beads 3. When the pressure sensing probe on the corresponding first L-shaped rod 25 is triggered first, the corresponding pressure sensing probe transmits a signal to the control module, and controls the corresponding second electromagnetic chuck 64 to be energized to attract the second iron block 63, so that the enlarged elastic diaphragm 65 is reset, releasing the limit on the corresponding lamp bead body 4, that is, ensuring that each LED lamp bead 3 in the correct placement state remains in a clamped state, preventing it from being affected by the movement of adjacent LED lamp beads 3, improving the practicability of the device, and ensuring the normal movement of the LED lamp beads 3 in the reversed state.

[0048] Example 5. Please refer to Figure 1-16 In this Example 5, the following improvements are made on the basis of Example 4. Specifically, a U-shaped seat 66 is fixed to the side surface of the second extension plate 34; limiting grooves 67 are provided on both inner sides of the inner wall of the U-shaped plate 7; a sliding plate 68 is slidably arranged between the two limiting grooves 67; support springs 69 are symmetrically connected between the sliding plate 68 and the U-shaped seat 66; a first armature iron column 70 is fixed to the bottom surface of the sliding plate 68; a first electromagnetic coil 71 electrically connected to the output end of the controller 47 is installed on the inner bottom surface of the U-shaped seat 66; a cross plate 72 is fixed to the end of the sliding plate 68; support plates 73 are symmetrically fixed to both ends of the cross plate 72; a guide rod 74 is fixed between the opposite support plates 73; second electromagnetic coils 75 and third electromagnetic coils 76 electrically connected to the output end of the controller 47 are sequentially installed between the two ends of the cross plate 72 and located between the adjacent support plates 73; a sliding box 77 is slidably arranged between the two guide rods 74; mounting springs 90 sleeved on the corresponding guide rods 74 are fixedly connected between the sliding box 77 and each support plate 73; a plurality of second air holes 78 are evenly provided on the bottom surface of the sliding box 77; the sliding box 77 is connected to the air outlet end of the air extraction pump 48 through a hose; second armature iron columns 79 and third armature iron columns 80 are sequentially installed on the two opposite side surfaces of the sliding box 77; an image recognition module 81 is fixedly installed on the side surface of the U-shaped seat 66; the image recognition module 81 includes a high-definition camera and a recognition host electrically connected to the high-definition camera; a first inclined plate 82 and a second inclined plate 83 for placing qualified products and defective products are sequentially and obliquely downwardly installed on the two opposite side surfaces of the U-shaped seat 66; mounting grooves 84 slidably matched with the positive electrode welding feet 5 and the negative electrode welding feet 6 are provided on the surfaces of the first inclined plate 82 and the second inclined plate 83; an electric push rod 85 electrically connected to the output end of the controller 47 is fixed to the side surface of the second inclined plate 83; a power-on seat 86 is fixed to the telescopic end of the electric push rod 85; a positive electrode detection probe 87 and a negative electrode detection probe 88 are sequentially electrically connected to the surface of the power-on seat 86.

[0049] Working principle of the fifth embodiment: after completing the replacement of the positive electrode welding foot 5 and the negative electrode welding foot 6 of each group of LED lamp beads 3 in the placement state, the corresponding placement rack 2 is controlled to rotate until the shading plate 30 on the next group of placement racks 2 blocks the infrared travel switch 37, and the rotation is stopped. In the initial state, the first electromagnetic coil 71 is energized to attract the first armature column 70, and the corresponding support spring 69 is compressed. At this time, the placement rack 2 that has completed the replacement of the positive electrode welding foot 5 and the negative electrode welding foot 6 is placed directly under the U-shaped seat 66. At this time, the lowest LED lamp bead is placed directly under the sliding box 77, and the vacuum pump 48 is controlled to start to extract the air in the sliding box 77 to form a negative pressure environment, thereby the corresponding LED lamp bead 3 The first electromagnetic coil 71 is sucked tightly and controlled to lose power. Under the elastic restoring force of the supporting spring 69, the horizontal plate 72 and the sucked LED lamp bead 3 are driven to rise until they are aligned with the image recognition module 81. The electric push rod 85 is controlled to start, driving the positive electrode detection probe 87 and the negative electrode detection probe 88 to extend and conduct at the positive electrode welding foot 5 and the negative electrode welding foot 6, driving the chip 23 set inside the LED lamp bead 3 to light up, and the chip 23 releases light to illuminate the front of the LED lamp bead 3 and the surrounding area of ​​the chip, so that the camera can take a clear image of the front of the LED lamp bead 3 and the surrounding area of ​​the chip, and save it inside the host, so as to identify and screen defective products and improve the appearance quality of the inspected LED lamp bead 3 products.

[0050] When the LED lamp bead 3 is judged to be a qualified product, the second electromagnetic coil 75 is controlled to be energized to attract the second armature column 79, driving the cross plate 72 together with the adsorbed LED lamp bead 3 to move to the top of the first inclined plate 82, and a conducting pipe is arranged on the hose between the sliding box 77 and the vacuum pump 48, and an electromagnetic valve is arranged on the conducting pipe. The electromagnetic valve is controlled to open to release the negative pressure environment of the sliding box 77, and under the action of gravity, the positive electrode welding foot 5 and the negative electrode welding foot 6 on the qualified LED lamp bead 3 fall into the corresponding installation groove 84 and are stored; when the LED lamp bead 3 is judged to be an unqualified product, the third electromagnetic coil 76 is controlled to be energized to attract the third armature column 80, and the above operation is performed similarly, so that the positive electrode welding foot 5 and the negative electrode welding foot 6 on the unqualified LED lamp bead 3 fall into the corresponding installation groove 84 and are stored.

[0051] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0054] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0055] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A MiniLED appearance defect detection system, comprising a detection rack (1), a placement rack (2) uniformly fixed on the detection rack (1), and a plurality of LED lamp beads (3) slidably arranged on the placement rack (2); characterized in that: The LED lamp bead (3) includes a lamp bead body (4); a positive electrode welding foot (5) and a negative electrode welding foot (6) are respectively welded on both sides of the front surface of the lamp bead body (4); The placement rack (2) includes a U-shaped plate (7); an L-shaped plate (8) is fixed on the bottom surface of the U-shaped plate (7); baffles (89) are fixed at both ends of the U-shaped plate (7) and inclined downward; a support plate (9) is arranged at the end of the L-shaped plate (8) and inclined downward; a chute (10) for slidingly cooperating with the positive electrode welding foot (5) and the negative electrode welding foot (6) is formed on the surface of the support plate (9); A plurality of fixing platforms (11) are uniformly fixed on the surface of the support plate (9); an annular groove (12) communicating with the chute (10) is formed on the surface of the fixing platform (11); the positive electrode welding foot (5) and the negative electrode welding foot (6) corresponding to the LED lamp bead (3) are rotatably arranged in the annular groove (12); Vertical plates (13) are symmetrically fixed on the bottom surface of the fixing platform (11); an L-shaped strip (14) is fixed on the side surface of the L-shaped plate (8); each vertical plate (13) is fixed on the surface of the L-shaped strip (14); a lifting member (15) slidably arranged on the surface of the L-shaped strip (14) and slidably cooperating with each pair of opposite vertical plates (13) is provided.

2. The MiniLED appearance defect detection system according to claim 1, wherein: A guiding groove (16) is formed on the side surface of the vertical plate (13); a fixing plate (17) is fixed between two opposite vertical plates (13); the lifting member (15) includes a bottom plate (18); a plurality of threaded sleeves (19) are uniformly fixed on the surface of the bottom plate (18); a screw rod is screwed in the threaded sleeve (19); a slider (20) slidably cooperating with the corresponding pair of opposite guiding grooves (16) is fixed at the top of the screw rod; a return spring (21) is fixed between the top of the slider (20) and the bottom surface of the fixing plate (17).

3. The MiniLED appearance defect detection system according to claim 2, characterized in that: A plastic body (22) is filled and arranged inside the lamp bead body (4); a chip (23) is arranged inside the plastic body (22); gold wires (24) are electrically connected to both ends of the chip (23); both ends of the chip (23) are connected to the positive electrode welding foot (5) and the negative electrode welding foot (6) through the gold wires (24); A first L-shaped rod (25) is fixed on one side surface of the slider (20), and a second L-shaped rod (26) is fixed on the other opposite side surface; the height of the first L-shaped rod (25) is higher than that of the second L-shaped rod (26); the height of the first L-shaped rod (25) is the same as the length of the positive electrode welding foot (5); the height of the second L-shaped rod (26) is the same as the length of the negative electrode welding foot (6).

4. A MiniLED appearance defect detection system according to claim 3, characterized in that: A first iron block (27) is fixed to the bottom surface of the bottom plate (18); a first electromagnetic chuck (28) is fixed to the surface of the L-shaped strip (14); a micro electric control box (29) is fixedly installed between the U-shaped plate (7) and the L-shaped plate (8) by fastening bolts; a control module is arranged inside the micro electric control box (29); the output end of the control module is electrically connected to the first electromagnetic chuck (28); a light-shielding plate (30) is pasted on the side surface of the L-shaped strip (14). The detection frame (1) includes a mounting plate (31); mounting legs (32) are fixed to the surface of the mounting plate (31), and a first extension plate (33) and a second extension plate (34) are sequentially fixed to the peripheral side surface thereof; a connecting plate (35) is fixedly arranged at the end of the first extension plate (33) in an inclined downward manner; an infrared travel switch (37) electrically connected to the input end of the control module is installed on the side surface of the connecting plate (35); pressure sensing probes electrically connected to the input end of the control module are arranged at the ends of the first L-shaped rod (25) and the second L-shaped rod (26).

5. A MiniLED appearance defect detection system according to claim 4, characterized in that: A plurality of rotating tubes (38) with sealed tops are rotatably arranged through the surface of the connecting plate (35) in a uniform manner; a partition plate (39) is fixed to the inner wall of the rotating tube (38); a pressure sensor (91) electrically connected to the input end of the control module is installed on the bottom surface of the partition plate (39); a plurality of first air holes (40) are uniformly formed on the surface of the partition plate (39); an ear tube (41) is rotatably arranged in a sealed manner at the top of the rotating tube (38); a positioning plate (42) is fixed to the surface of the connecting plate (35); an air extraction pipe (43) is fixedly arranged through the side surface of the positioning plate (42); each ear tube (41) is fixed to the air extraction pipe (43) and communicated with the air extraction pipe (43) in a uniform manner; an air vent pipe (44) is communicated with the air extraction pipe (43); a solenoid valve (45) is arranged on the air vent pipe (44).

6. The MiniLED appearance defect detection system according to claim 5, characterized in that: A mounting seat (46) is fixed between the first extension plate (33) and the second extension plate (34); a controller (47) and an air extraction pump (48) are sequentially fixed to the surface of the mounting seat (46); the air extraction end of the air extraction pump (48) is connected to the air extraction pipe (43) through a hose; a toothed ring (49) is fixed to the peripheral side surface of the rotating tube (38); sliding sleeves (50) are symmetrically fixed to the surface of the connecting plate (35); a toothed plate (51) meshing with each toothed ring (49) is slidably arranged between the two sliding sleeves (50); a guide tube (52) is fixed to the side surface of the Z-shaped plate (36); a sliding rod (53) is slidably arranged inside the guide tube (52); one end of the sliding rod (53) is fixedly connected to the toothed plate (51), and a connecting spring is connected between the other end thereof and the guide tube (52); a third iron block is fixed to the end of the sliding rod (53); a third electromagnetic chuck electrically connected to the output end of the controller (47) is fixed to the inner wall of the guide tube (52); the output end of the controller (47) is electrically connected to the air extraction pump (48) and the solenoid valve (45) respectively.

7. The MiniLED appearance defect detection system according to claim 6, wherein: A servo motor (54) electrically connected to the output end of the controller (47) is fixedly installed on the bottom surface of the mounting base (46); a fixing plate (55) is fixed to the output end of the servo motor (54); a plurality of first ear plates (56) are evenly fixed on the circumferential side surface of the fixing plate (55); a second ear plate (57) is fixed to the side surface of the U-shaped plate (7); the first ear plate (56) and the second ear plate (57) are fixedly connected by a fastening bolt.

8. A MiniLED appearance defect detection system according to claim 7, characterized in that: A plurality of screw holes (58) are evenly formed in the side surface of a baffle (89); a pressing member (59) is screwed in the screw hole (58); the pressing member (59) includes a piston cylinder (60); a piston (61) is slidably arranged inside the piston cylinder (60); a compression spring (62) is connected between the piston (61) and the piston cylinder (60); a second iron block (63) is fixed to the side surface of the piston (61); a second electromagnetic chuck (64) electrically connected to the output end of the control module is fixed to the inner wall of the piston cylinder (60); an elastic diaphragm (65) is arranged at the end of the piston cylinder (60); a plurality of anti-slip protrusions are evenly arranged on the outer surface of the elastic diaphragm (65).

9. The MiniLED appearance defect detection system according to claim 8, characterized in that: A U-shaped seat (66) is fixed to the side surface of the second extension plate (34); limiting grooves (67) are formed on both sides of the inner wall of the U-shaped plate (7); a sliding plate (68) is slidably arranged between the two limiting grooves (67); support springs (69) are symmetrically connected between the sliding plate (68) and the U-shaped seat (66); a first armature iron column (70) is fixed to the bottom surface of the sliding plate (68); a first electromagnetic coil (71) electrically connected to the output end of the controller (47) is installed on the inner bottom surface of the U-shaped seat (66); A cross plate (72) is fixed to the end of the sliding plate (68); support plates (73) are symmetrically fixed to both ends of the cross plate (72); a guide rod (74) is fixed between the two opposite support plates (73); a second electromagnetic coil (75) and a third electromagnetic coil (76) electrically connected to the output end of the controller (47) are sequentially installed between the two ends of the cross plate (72) and adjacent support plates (73); A sliding box (77) is slidably arranged between the two guide rods (74); mounting springs (90) sleeved on the corresponding guide rods (74) are fixedly connected between the sliding box (77) and each support plate (73); a plurality of second air holes (78) are evenly formed in the bottom surface of the sliding box (77); the sliding box (77) is connected to the air outlet end of the air extraction pump (48) through a hose; a second armature iron column (79) and a third armature iron column (80) are sequentially installed on two opposite side surfaces of the sliding box (77).

10. A MiniLED appearance defect detection system according to claim 9, characterized in that: The side of the U-shaped seat (66) is fixedly installed with an image recognition module (81); the image recognition module (81) includes a high-definition camera and a recognition host electrically connected to the high-definition camera; on two opposite sides of the U-shaped seat (66), a first inclined plate (82) and a second inclined plate (83) for placing qualified products and defective products are sequentially installed in an inclined downward manner; mounting grooves (84) for slidingly matching with the positive electrode welding feet (5) and the negative electrode welding feet (6) are formed on the surfaces of the first inclined plate (82) and the second inclined plate (83). An electric push rod (85) electrically connected to the output end of the controller (47) is fixed on the side of the second inclined plate (83); a power-on seat (86) is fixed at the telescopic end of the electric push rod (85); a positive electrode detection probe (87) and a negative electrode detection probe (88) are sequentially electrically connected to the surface of the power-on seat (86).

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