LED display screen reliability testing device

Abstract

The invention discloses an LED display screen reliability testing device which comprises an input roller way, the input roller way is perpendicular to an output roller way, a support is erected between the input roller way and the output roller way, two translation guide rails are arranged on the support, and detection assemblies are arranged in the translation guide rails; the detection assembly comprises a sliding plate, the sliding plate is slidably connected into the translation guide rail, a clamping guide rail is arranged below the sliding plate, and symmetrical clamping blocks are slidably arranged on the two sides of the clamping guide rail; a detection hole is formed in the center of the clamping guide rail, and a detection sensor is arranged on the detection hole; compared with the prior art, the test platform is an advanced test platform which integrates automatic carrying, self-adaptive accurate focusing and detection, integrated dynamic environment simulation and vibration synchronous tracking detection.

Description

Technical Field

[0001] This invention relates to the field of LED testing technology, specifically to an LED display screen reliability testing device. Background Technology

[0002] As a core carrier of modern information display, LED displays are widely used in key areas such as outdoor advertising, stage performances, traffic control, security monitoring, and high-end commercial displays. Their long-term operational stability and reliability directly affect the continuity of information transmission, public safety, and users' commercial interests. A single display failure can cause chaos at a major event, lead to misleading information at a transportation hub, and result in the loss of critical information in security monitoring. Therefore, systematic reliability testing of LED displays before they leave the factory is crucial. This testing covers not only electrical performance (such as drive stability) and optical performance (such as brightness, color uniformity, and detection of dead and bright pixels), but also mechanical structural reliability and environmental adaptability. Simulating mechanical stresses such as vibration and impact that may be encountered during transportation, installation, and long-term use is a key step in evaluating solder joint quality, structural robustness, and component fatigue resistance, effectively eliminating early potential defects and improving the product's mean time between failures (MTBF).

[0003] Currently, reliability testing of LED displays, especially composite testing combining mechanical stress and optical performance, primarily relies on discrete, station-based testing: multiple independent workstations are set up on the production line. The display first undergoes static image testing (defect and uniformity) at an optical inspection station; then it is moved to an independent vibration testing bench for simulated transport vibration testing; after vibration, it may need to be moved again to another workstation for post-vibration re-inspection. However, this method is inefficient, with multiple loading, unloading, handling, and positioning processes leading to long testing cycles and significant production capacity bottlenecks. Vibration testing is completely separated from optical performance testing, making it impossible to know the real-time status of the display during vibration. Problems such as momentary screen flickering, distorted images, and poor contact caused by vibration may disappear after vibration stops, thus being missed. This requires multiple independent devices (optical inspection instruments, vibration tables, and handling robots) and a larger workspace, resulting in high equipment investment and maintenance costs.

[0004] Therefore, it is necessary to provide an LED display reliability testing device to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: an LED display screen reliability testing device, comprising an input roller conveyor, wherein the input roller conveyor and the output roller conveyor are arranged perpendicularly, a support is erected between the input roller conveyor and the output roller conveyor, two translation guide rails are provided on the support, and a detection component is provided in the translation guide rails;

[0006] The detection component includes a sliding plate, which is slidably connected to a translation guide rail. A clamping guide rail is provided under the sliding plate, and symmetrical clamping blocks are slidably provided on both sides of the clamping guide rail.

[0007] The clamping guide rail has a detection hole at its center, and a detection sensor is installed on the detection hole.

[0008] Furthermore, the sliding plate is provided with an actuator capable of driving it to translate in the translation guide rail.

[0009] Furthermore, clamping telescopic cylinders connected to the clamping blocks are provided on both sides of the clamping guide rail.

[0010] Furthermore, four guide shafts are fixed on the clamping guide rail, and the upper ends of the guide shafts slide through the sliding plate;

[0011] A middle plate with a through-axis is slidably disposed between the clamping guide rail and the sliding plate.

[0012] Furthermore, each guide shaft between the middle plate and the clamping guide rail is fitted with a spring.

[0013] Furthermore, a lifting cylinder is provided on the sliding plate, and the piston rod of the lifting cylinder is connected to the middle plate.

[0014] Furthermore, the detection sensor is vertically and flexibly positioned directly below the middle plate and concentric with the detection hole, and a connecting plate is fixedly sleeved in the detection sensor;

[0015] A central guide rail is fixed at the center of the middle plate, and sliders are slidably arranged on both sides of the central guide rail. A push rod is hinged to the clamping block. The push rod slides through the clamping guide rail and is hinged to the corresponding slider. A connecting rod is hinged to each slider, and the other end of each connecting rod is hinged to the connecting plate.

[0016] Furthermore, gears are rotatably arranged on both sides of the middle plate, and a rotating wheel is concentrically fixed on one side of the gears, with multiple grooves formed on the edge of the rotating wheel;

[0017] Two guide shafts on the same side are fixed together by a connecting strip, and a protrusion that can fit into the groove of the wheel edge is fixed in the middle of the connecting strip.

[0018] Furthermore, racks are fixed to one side of the two translational guide rails on the bracket, and the gears mesh with the corresponding racks.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This invention perfectly integrates two originally separate processes: material transfer and reliability testing. The device simultaneously completes all tests while transporting the display screen from the input roller conveyor to the output roller conveyor, eliminating the time spent on intermediate handling, positioning, and waiting. This achieves "zero-interval" testing on production or quality inspection lines, significantly shortening the total testing cycle for a single product, increasing overall production line throughput and automation levels, and reducing the need for manual intervention.

[0021] In this invention, a unique push-rod-connecting-slider mechanical linkage mechanism automatically links the height of the detection sensor with the opening and closing degree of the clamping blocks. When facing a large screen, the sensor automatically maintains a greater distance to ensure that the detection field of view covers the entire screen; when facing a small screen, the sensor automatically moves closer, improving the resolution and detection accuracy per pixel. This effectively solves the contradiction between "large screen coverage" and "small screen accuracy" that traditional fixed-height sensors struggle to balance. Furthermore, it ensures that the left and right clamping blocks move in strict synchronous opposite directions, keeping the display screen centered throughout the clamping process, providing a stable reference position for detection, and improving the consistency and accuracy of the test.

[0022] This invention creatively utilizes the power of the translational movement of the detection component, which is converted into mechanical energy to drive the rotation of the rotating wheel through a gear-rack transmission. This mechanical energy then generates periodic up-and-down vibrations through a bump-groove mechanism and is directly transmitted to the clamped display screen. During testing, the vibration stress that the product may experience during transportation, installation, and use is dynamically simulated, enabling reliability testing to move from "static" to "dynamic," and exposing potential defects (such as poor soldering, loose connections, and poor component fatigue resistance) earlier and more realistically. The vibration testing function is highly integrated into the transfer mechanism, saving the space and cost of expensive independent vibration testing equipment and simplifying the testing process. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an LED display screen reliability testing device;

[0024] Figure 2 This is a schematic diagram of the detection component.

[0025] Figure 3 This is a schematic diagram of the front structure of the detection component;

[0026] Figure 4 This is a schematic diagram of the side structure of the detection component;

[0027] In the diagram: 1. Input roller conveyor; 2. Output roller conveyor; 3. Support; 31. Translation guide rail; 32. Rack; 4. Detection assembly; 41. Sliding plate; 42. Clamping guide rail; 43. Middle plate; 431. Middle guide rail; 432. Slider; 433. Push rod; 434. Connecting rod; 435. Gear; 436. Rotary wheel; 44. Guide shaft; 45. Detection hole; 46. Spring; 47. Connecting bar; 5. Clamping block; 6. Lifting cylinder; 7. Detection sensor; 71. Connecting plate; 8. Clamping telescopic cylinder. Detailed Implementation

[0028] Please see Figures 1-4 In this embodiment of the invention, an LED display screen reliability testing device includes an input roller conveyor 1, which is arranged perpendicularly to an output roller conveyor 2. A support 3 is erected between the input roller conveyor 1 and the output roller conveyor 2. Two translation guide rails 31 are provided on the support 3, and a detection component 4 is provided in the translation guide rails 31.

[0029] The detection component 4 includes a sliding plate 41, which is slidably connected to the translation guide rail 31. A clamping guide rail 42 is provided under the sliding plate 41, and symmetrical clamping blocks 5 are slidably provided on both sides of the clamping guide rail 42.

[0030] The clamping guide rail 42 has a detection hole 45 at its center, and a detection sensor 7 is installed on the detection hole 45.

[0031] When the LED display screen is clamped by the detection component 4 through the clamping block 5 from the input roller 1, the detection sensor 7 detects the LED display screen clamped by the clamping block 5 through the detection hole 45, and at the same time transfers the LED display screen to the output roller 2. The reliability test of the LED display screen can be realized while transferring the material.

[0032] In this embodiment, the sliding plate 41 is provided with an actuator that can drive it to translate in the translation guide rail 31.

[0033] In this embodiment, clamping telescopic cylinders 8 connected to the clamping blocks 5 are provided on both sides of the clamping guide rail 42.

[0034] The translation actuator can drive the detection component 4 to translate along the translation guide rail 31, and the clamping telescopic cylinder 8 can drive the two clamping blocks 5 to clamp the LED display.

[0035] In this embodiment, four guide shafts 44 are fixed on the clamping guide rail 42, and the upper ends of the guide shafts 44 slide through the sliding plate 41.

[0036] A middle plate 43, which passes through the guide shaft 44, is slidably disposed between the clamping guide rail 42 and the sliding plate 41.

[0037] In this embodiment, each guide shaft 44 between the middle plate 43 and the clamping guide rail 42 is fitted with a spring 46.

[0038] In this embodiment, a lifting cylinder 6 is provided on the sliding plate 41, and the piston rod of the lifting cylinder 6 is connected to the middle plate 43.

[0039] In other words, the lifting cylinder 6 can drive the middle plate 43 and the clamping guide rail 42 to rise and fall, so that the clamping block 5 in the clamping guide rail 42 can clamp to both sides of the LED display screen, and the spring 46 can provide elastic cushioning.

[0040] In this embodiment, the detection sensor 7 is vertically and vertically positioned directly below the middle plate 43 and concentric with the detection hole 45. A connecting plate 71 is fixedly sleeved in the detection sensor 7.

[0041] A central guide rail 431 is fixed at the center of the central plate 43. Slider blocks 432 are slidably arranged on both sides of the central guide rail 431. A push rod 433 is hinged to the clamping block 5. The push rod 433 slides through the clamping guide rail 42 and is hinged in the corresponding slider 432. A connecting rod 434 is hinged in each slider 432. The other end of each connecting rod 434 is hinged to the connecting plate 71.

[0042] When the clamping blocks 5 on both sides move towards the center to clamp the two sides of the LED display screen, the push rod 433 will push the slider 432 to move towards the center as well, thereby causing the connecting rod 434 to push the connecting plate 71 downward to drive the detection sensor 7 down, so as to bring the detection sensor 7 closer to the LED display screen.

[0043] In other words, the larger the LED display screen size, the further away the detection sensor 7 will be from the LED display screen to increase the coverage area; the smaller the LED display screen size, the closer the detection sensor 7 will be to the LED display screen to increase the resolution; thus, the detection sensor 7 will always cover LED display screens of different sizes.

[0044] In addition, the push rod 433, the connecting rod 434 and the connecting plate 71 can ensure that the two clamping blocks 5 move synchronously in opposite directions, ensuring that the LED display screen remains centered when clamped.

[0045] In this embodiment, gears 435 are rotatably arranged on both sides of the middle plate 43, and a rotating wheel 436 is concentrically fixed on one side of the gears 435. Multiple grooves are formed on the edge of the rotating wheel 436.

[0046] Two guide shafts 44 on the same side are fixed together by a connecting strip 47, and a protrusion that can fit into the groove of the wheel 436 is fixed in the middle of the connecting strip 47.

[0047] In this embodiment, racks 32 are fixed on one side of the two translation guide rails 31 on the bracket 3, and the gears 435 mesh with the corresponding racks 32.

[0048] In other words, when the detection component 4 moves in the translation guide rail 31, the meshing of gear 435 and rack 32 will drive gear 435 and rotating wheel 436 to rotate. This will cause the groove on the edge of rotating wheel 436 to intermittently push the protrusion in the middle of connecting bar 47, causing connecting bar 47 to move downward. Under the action of spring 46, connecting bar 47 will move upward, thereby causing guide shaft 44 to push the LED display screen held by clamping guide rail 42 and clamping block 5 to vibrate, simulating the vibration of LED display screen during transportation, installation and use.

[0049] Furthermore, when the clamping guide rail 42 vibrates up and down, the distance between the clamping guide rail 42 and the middle plate 43 also changes according to the frequency, thereby causing the push rod 433 and the connecting rod 434 to push the connecting plate 71 and the detection sensor 7 to slide up and down synchronously, ensuring that the detection sensor 7 always covers the LED display screen during the vibration process of the LED display screen, and avoiding exceeding the detection range.

[0050] In practice, the LED display screen to be tested is placed flat at the beginning of the input roller conveyor 1, and the input roller conveyor 1 smoothly transports the display screen to the predetermined picking station located directly below the initial position of the detection component 4 inside the device.

[0051] When cylinder 6 moves, it pushes the middle plate 43 and the clamping guide rail 42, which is flexibly connected to it by spring 46, to descend together. When the clamping blocks 5 on both sides of the clamping guide rail 42 are lowered to the appropriate height on both sides of the display screen, the clamping telescopic cylinder 8 moves synchronously, driving the clamping blocks 5 on both sides to move towards each other, and firmly clamping the LED display screen from both sides.

[0052] While the clamping blocks 5 move towards each other to clamp the display screen, the push rod 433, which is hinged to the clamping blocks 5, pushes the slider 432 to slide towards the center on the middle guide rail 431. The slider 432 pulls the connecting plate 71 through the connecting rod 434, causing the detection sensor 7 fixed on it to descend accordingly.

[0053] Furthermore, the wider the display screen, the greater the distance between the two clamping blocks 5. Through the transmission of push rod 433 and connecting rod 434, the descent distance of the detection sensor 7 is smaller, keeping it at a certain distance from the display screen surface to ensure detection coverage area. Conversely, the smaller the display screen, the greater the descent distance of the sensor 7, bringing it closer to the screen to improve detection resolution. This process is completed automatically, ensuring that the sensor 7 is aligned with the center area of ​​the display screen of different sizes at the optimal distance. At the same time, the linkage mechanism ensures the synchronous reverse movement of the two clamping blocks 5, achieving clamping centering.

[0054] After clamping and positioning, the detection sensor 7 immediately scans the display area of ​​the currently clamped LED display screen through the detection hole 45 in the center of the clamping guide rail 42 to complete the preliminary display quality (such as brightness and color uniformity, dead pixels) detection.

[0055] The drive translation actuator causes the detection component 4 to clamp the display screen and begin to move at a constant speed along the translation guide rail 31 from the input roller conveyor 1 area to the output roller conveyor 2 area. During the translation process, the gear 435 fixed on the middle plate 43 meshes with the rack 32 fixed on the bracket 3, thus starting to rotate. The rotating wheel 436, which is coaxially fixed with the gear 435, rotates accordingly. During the rotation, the groove on the edge of the rotating wheel 436 will intermittently press down on the protrusion in the middle of the connecting bar 47 fixed on the two guide shafts 44 on the same side. Under the reset action of the spring 46, the connecting bar 47 and the guide shaft 44 will spring back upward, thus generating up-and-down reciprocating motion. This motion is transmitted to the clamping guide rail 42 and the clamping block 5 through the guide shaft 44, causing the clamped LED display screen to generate simulated vibration to test its reliability in similar transportation and installation processes.

[0056] When the clamping guide rail 42 vibrates up and down, the distance between it and the middle plate 43 changes dynamically. This will adjust the height of the detection sensor 7 in real time through the push rod 433 and the connecting rod 434 mechanism, ensuring that the detection sensor 7 can synchronously follow the vibration amplitude during the vibration of the display screen, always maintaining the preset optimal detection distance and coverage, avoiding the detection area from falling off or the detection from failing due to vibration, thereby achieving continuous and effective detection in a vibration environment.

[0057] When the detection component 4 moves the display screen to a predetermined position above the output roller conveyor 2, the translation stops, the clamping telescopic cylinder 8 retracts, the two side clamping blocks 5 are driven to release the display screen, the lifting cylinder 6 is lifted, and the middle plate 43, clamping guide rail 42 and clamping blocks 5 are raised as a whole, so that the display screen is placed smoothly on the output roller conveyor 2. The output roller conveyor 2 sends out the LED display screen that has completed the test. The detection component 4 returns to the initial position above the input roller conveyor 1 under the drive of the translation actuator, ready to start the next cycle.

[0058] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An LED display screen reliability testing device, comprising an input roller conveyor (1), characterized in that, The input roller conveyor (1) and the output roller conveyor (2) are arranged perpendicularly. A support (3) is installed between the input roller conveyor (1) and the output roller conveyor (2). Two translation guide rails (31) are installed on the support (3). A detection component (4) is installed in the translation guide rails (31). The detection component (4) includes a sliding plate (41), which is slidably connected to the translation guide rail (31). A clamping guide rail (42) is provided under the sliding plate (41), and symmetrical clamping blocks (5) are slidably provided on both sides of the clamping guide rail (42). The clamping guide rail (42) has a detection hole (45) at its center, and a detection sensor (7) is provided on the detection hole (45).

2. The LED display screen reliability testing device according to claim 1, characterized in that, The sliding plate (41) is provided with an actuator that can drive it to translate in the translation guide rail (31).

3. The LED display screen reliability testing device according to claim 1, characterized in that, The clamping guide rail (42) is provided with clamping telescopic cylinders (8) connected to the clamping block (5) on both sides.

4. The LED display screen reliability testing device according to claim 1, characterized in that, Four guide shafts (44) are fixed on the clamping guide rail (42), and the upper end of the guide shaft (44) slides through the sliding plate (41). A middle plate (43) that passes through the guide shaft (44) is slidably disposed between the clamping guide rail (42) and the sliding plate (41).

5. The LED display screen reliability testing device according to claim 4, characterized in that, Each guide shaft (44) between the middle plate (43) and the clamping guide rail (42) is fitted with a spring (46).

6. The LED display screen reliability testing device according to claim 4, characterized in that, A lifting cylinder (6) is provided on the sliding plate (41), and the piston rod of the lifting cylinder (6) is connected to the middle plate (43).

7. The LED display screen reliability testing device according to claim 4, characterized in that, The detection sensor (7) is vertically and vertically positioned directly below the middle plate (43) and concentric with the detection hole (45). A connecting plate (71) is fixedly sleeved in the detection sensor (7). The center of the middle plate (43) is fixed with a central guide rail (431), and sliders (432) are slidably arranged on both sides of the central guide rail (431). A push rod (433) is hinged on the clamping block (5). The push rod (433) slides through the clamping guide rail (42) and is hinged in the corresponding slider (432). A connecting rod (434) is hinged in each slider (432), and the other end of each connecting rod (434) is hinged in the connecting plate (71).

8. The LED display screen reliability testing device according to claim 4, characterized in that, Gears (435) are rotatably arranged on both sides of the middle plate (43), and a rotating wheel (436) is concentrically fixed on one side of the gear (435). Multiple grooves are opened on the edge of the rotating wheel (436). Two guide shafts (44) on the same side are fixed together by a connecting strip (47), and a protrusion in the middle of the connecting strip (47) is fixed to fit into the groove of the wheel (436).

9. The LED display screen reliability testing device according to claim 8, characterized in that, The bracket (3) has two translation guide rails (31) with racks (32) fixed on one side, and the gears (435) mesh with the corresponding racks (32).

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