LED lamp bead surface gluing device

Abstract

An LED lamp bead surface gluing device comprises an operation table, a fixing mechanism used for fixing an LED display module is arranged on the upper surface of the operation table, portal frames are arranged on the two sides of the upper surface of the operation table, silk screen plates are arranged on the lower portions of the portal frames, the silk screen plates are suspended above the LED display module, and the LED display module is arranged on the operation table. A lead screw nut structure is arranged on the top of the portal frame, an air cylinder is arranged on a nut of the lead screw nut structure, and a scraper is arranged on an output rod of the air cylinder. The gluing device has the advantages that the equipment cost is reduced, the operation is simplified, and the gluing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of LED display module manufacturing technology, and in particular to an LED lamp bead surface coating device. Background Technology

[0002] The current approach to transparent LED display modules involves placing the display screen within a frame to create small modules, and then combining several small modules to form a larger LED display module. Although efforts are made to make the frame as narrow as possible to minimize its visual impact, a black line is still always present when viewing the image.

[0003] To address this issue, frameless transparent LED display modules have been developed. These modules come in two types: one is a hanging type, where the small modules are connected by specially designed micro-connectors, minimizing visual impact; the other is a window-mounted type, where adhesive is applied to the surface of the LED beads, and multiple small modules are then directly attached to window glass or interior partition glass. This method eliminates the need for micro-connectors and offers a better visual effect.

[0004] Existing methods for applying adhesive to the surface of LED beads mainly involve manual application and dispensing machines. Manual application is not only inefficient but also makes it difficult to control the amount of adhesive applied, often resulting in adhesive being applied not only to the surface of the LED but also to the sides of the LED beads, leading to customer dissatisfaction. Dispensing machines, on the other hand, have the problems of high equipment costs, the need for professional operators, and low dispensing efficiency. Utility Model Content

[0005] The purpose of this application is to provide a method and apparatus for coating the surface of LED beads, which has the advantages of reducing equipment costs, simplifying operation and improving coating efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for coating the surface of LED beads, comprising:

[0008] S1. Prepare a predetermined number of openings on the screen printing plate, wherein the size of the openings is the same as the size of the LED beads;

[0009] S2. Place the LED display module with a preset number of LED beads on the operating table and position it with a fixing fixture so that the LED beads on the LED display module correspond to the openings on the screen printing plate.

[0010] S3. Maintain a predetermined distance between the screen printing stencil and the LED beads;

[0011] S4. Pour adhesive into one end of the screen printing stencil, apply a predetermined pressure to the squeegee, and scrape the squeegee on the screen printing stencil to scrape the adhesive on the screen printing stencil into the opening, and further apply the adhesive to the surface of the LED beads.

[0012] As an improvement to this utility model, after S4, S5 is also included: covering the surface of the LED beads with release paper.

[0013] As an improvement to this utility model, the predetermined distance is selected between 0.2mm and 8mm.

[0014] As an improvement to this utility model, the predetermined pressure is selected between 0.2-0.5MPa; the scraper angle is selected between 60°-75°; and the scraper speed is selected between 10-30cm / s.

[0015] As an improvement to this utility model, the mesh count of the screen printing stencil is selected between 200 and 450 mesh.

[0016] As an improvement to this utility model, the screen on the screen printing plate is made of stainless steel wire or polyester wire.

[0017] This utility model also provides an LED lamp bead surface coating device, including an operating table, a fixing mechanism for fixing LED display modules is provided on the upper surface of the operating table, a gantry frame is provided on both sides of the upper surface of the operating table, a screen printing stencil is provided at the lower part of the gantry frame, the screen printing stencil is suspended above the LED display modules, a lead screw and nut structure is provided at the top of the gantry frame, a cylinder is provided on the nut of the lead screw and nut structure, and a scraper is provided on the output rod of the cylinder.

[0018] As an improvement to this utility model, the screen printing stencil is connected to the gantry frame via a lifting mechanism, which is used to adjust the spacing between the screen printing stencil and the LED display module.

[0019] As an improvement to this utility model, the fixing mechanism is a fixing clamp, which is used to clamp the LED display module from both sides of the LED display module. The height of the fixing clamp is lower than the thickness of the LED display module.

[0020] As an improvement to this utility model, the fixing mechanism consists of a row of positioning pins, which are inserted into the positioning holes of the LED display module to position the LED display module. The height of the positioning pins is lower than the upper surface of the LED display module.

[0021] As can be seen from the above, the LED lamp bead surface coating method and coating device provided in this application achieve uniform adhesive coating through the cooperation of screen printing plate and scraper, which replaces the high cost and inefficient operation of traditional dispensing machine, and has the advantages of reducing equipment cost, simplifying operation and improving coating efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the rectangular structure of the adhesive application method of this utility model.

[0023] Figure 2 This is a side view of one embodiment of the adhesive coating device of this utility model.

[0024] Figure 3 for Figure 2 A schematic diagram of the structure of the screen printing stencil.

[0025] Figure 4 for Figure 2 A schematic diagram showing the structural relationship between the screen printing stencil and the operating table. Detailed Implementation

[0026] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In existing technologies, transparent LED display modules typically employ a window-mounted structure to achieve a frameless splicing effect, where adhesive is applied to the surface of the LED beads and then directly adhered to the glass surface. Traditional adhesive application methods rely on dispensing machines, which suffer from drawbacks such as high equipment purchase costs, the need for professional operator training, and low efficiency due to the single-point, one-bead application process. Especially in mass production scenarios, the dispensing speed struggles to keep pace with production capacity demands, and complex equipment maintenance further increases production costs.

[0028] To address these issues, engineers discovered that screen printing has the potential for batch adhesive transfer, but challenges remain, such as precise LED module positioning and uniform adhesive thickness control. Analysis revealed that matching the screen printing opening shape to the LED bead size enables precise adhesive coverage, while adjusting the screen spacing avoids contact contamination of the bead surface. Furthermore, developing a dedicated fixture ensures stable module positioning during batch adhesive application, and optimizing squeegee pressure parameters can replace the functions of traditional dispensing equipment.

[0029] Therefore, this utility model proposes a method for coating the surface of LED beads with adhesive (see...). Figure 1 An opening of the same size as the LED bead is prepared on a screen printing stencil; the LED display module is positioned on the worktable and fixed with a clamp so that the bead aligns with the opening of the stencil; after adjusting the distance between the stencil and the bead, the adhesive is applied to the surface of the bead through the opening using a scraper.

[0030] The screen printing stencil opening refers to the adhesive-permeable area that matches the outline of the LED beads. This area can be formed using laser cutting or chemical etching processes to ensure the adhesive coverage matches the surface dimensions of the LED beads. The fixing fixture is the mechanical structure that holds the two sides of the module. It can be implemented using pneumatic grippers or spring clamps to prevent module misalignment during adhesive application. The predetermined distance refers to the vertical gap between the lower surface of the stencil and the upper surface of the LED beads. This can be adjusted by the lifting mechanism to prevent the stencil from contacting the LED beads and causing contamination. The scraper pressure is the mechanical force required to propel the adhesive flow. This can be controlled by a cylinder pressure regulating device to ensure the adhesive evenly fills the stencil opening.

[0031] Specifically, the operation begins by fixing the LED display module onto the worktable, using clamps to secure both sides of the module and prevent displacement. Next, the height of the screen printing stencil is adjusted to ensure precise alignment and appropriate spacing between the stencil openings and the LED beads. Adhesive is poured onto one end of the stencil, and a scraper moves along the stencil surface under set pressure, pushing the adhesive to fill all the opening areas. The adhesive is then transferred through the openings to the LED bead surface, forming a uniform coating and completing the batch adhesive application.

[0032] Compared to existing technologies, traditional dispensing machines require precise three-dimensional motion mechanisms and dispensing valve control, while this method uses a planar scraping method to achieve batch dispensing, significantly reducing equipment complexity. The screen printing stencil is reusable and inexpensive to manufacture, requiring no specialized programming; ordinary workers can operate it after simple training. A single scraping motion can simultaneously apply adhesive to dozens to hundreds of LED beads, significantly improving production efficiency compared to single-point, one-bead dispensing.

[0033] Through the above technical solution, this utility model uses a standardized screen printing stencil to replace precision dispensing equipment, reducing equipment purchase and maintenance costs. The fixed fixture and stencil positioning system simplify the operation process and reduce reliance on specialized operators. The batch dispensing method significantly increases the amount of dispensing per unit time, making it suitable for large-scale frameless transparent LED module production scenarios.

[0034] This invention further proposes a step of covering the surface of the LED beads with release paper after the adhesive coating process is completed.

[0035] Release paper refers to a protective material with anti-stick properties, specifically made of kraft paper coated with a silicone oil layer or PE coated film. The release paper forms a temporary insulating interface with the uncured adhesive layer through its low-adhesion coating, preventing the adhesive layer from sticking to other objects during subsequent operations. The covering process involves manually or automatically laying the release paper flat on the surface of the LED display module, ensuring full adhesion between the release paper and the adhesive layer of each LED chip.

[0036] Specifically, immediately after the adhesive coating is applied by the squeegee, release paper is placed over the LED chip surface. The silicone oil coating on the release paper, upon contact with the adhesive layer, neither damages the adhesive layer structure nor fails to completely isolate it from external contaminants such as dust and oil. During the application process, the release paper adheres to the adhesive layer using its own weight or slight pressure, forming a smooth, bubble-free coating. Before subsequent module assembly, the release paper can be removed, leaving the adhesive layer in its initial coating state, ensuring effective adhesion to the glass substrate.

[0037] Compared to existing technologies, traditional methods do not apply a protective layer after adhesive application, making the adhesive layer susceptible to dust contamination in the environment or prone to adhesion to other materials during transportation and storage. Existing technologies rely on complex post-processing techniques or specialized equipment for adhesive layer protection, while this solution achieves adhesive layer protection through the physical covering of release paper in a single operation step, requiring no additional equipment investment or specialized operating skills.

[0038] Through the above technical solution, this utility model effectively avoids the problem of the adhesive layer being contaminated or accidentally sticking together before curing, ensuring the cleanliness of the adhesive layer surface and the stability of its bonding performance. At the same time, the release paper covering operation simplifies the process flow, reduces the module rework rate caused by adhesive layer contamination, and improves production efficiency.

[0039] This invention further proposes to control the gap between the screen printing stencil and the LED beads within the range of 0.2mm-8mm during the adhesive coating process.

[0040] The predetermined distance refers to the vertical distance between the lower surface of the screen printing stencil and the upper surface of the LED bead. This distance can be adjusted by changing the height of the screen printing stencil using a lifting mechanism. This distance prevents direct contact between the screen and the LED bead surface, thus preventing damage to the LED bead due to friction during adhesive application. The adhesive transfer process is affected by both gravity and surface tension. When the distance is less than 0.2mm, excessive contact pressure between the screen and the LED bead may result in an excessively thin adhesive layer or localized missing areas. When the distance exceeds 8mm, the adhesive may sag due to gravity, causing the coated area to overflow and forming edge burrs.

[0041] Specifically, when the squeegee applies pressure to push the adhesive through the screen opening, a spacing of 0.2-8mm creates a controllable adhesive flow channel. The adhesive is squeezed by the squeegee at the screen opening to form a uniform liquid film, which then permeates to the surface of the LED beads through capillary action. This spacing range ensures that the adhesive fully fills the opening area while limiting the free diffusion range of the adhesive after leaving the screen, allowing the thickness and shape of the adhesive layer to be precisely controlled by the screen opening size.

[0042] Compared to existing technologies, traditional adhesive coating processes do not clearly define the spacing range between the screen and the workpiece, often relying on operational experience for adjustment. Excessive spacing results in blurred adhesive edges, requiring multiple applications of adhesive; insufficient spacing leads to screen wear and insufficient adhesive application. This solution eliminates human error through quantitative control of the spacing parameter, improving the consistency of the adhesive layer thickness.

[0043] Through the above technical solution, this utility model ensures a uniform and stable adhesive layer thickness, avoiding missed coating or accumulation during the adhesive application process. This spacing range effectively balances the fluidity of the adhesive and the forming accuracy, achieving complete coverage of the adhesive layer on the LED bead surface in a single scraping action, while reducing screen loss rate and rework frequency.

[0044] This invention further proposes that the predetermined pressure can be selected between 0.2-0.5MPa, the scraper angle between 60°-75°, and the scraper speed between 10-30cm / s.

[0045] The predetermined pressure refers to the vertical force applied when the squeegee contacts the screen printing stencil. This can be achieved using a cylinder pressure regulation system or a servo motor drive system, with the pressure value controlled in real-time by a pressure sensor. This pressure range ensures the adhesive fully fills the stencil openings while preventing excessive compression that could cause the adhesive to seep into adjacent LED areas.

[0046] The squeegee angle refers to the angle between the squeegee blade's cutting edge and the screen printing stencil. This angle can be achieved using an adjustable squeegee holder mechanism, precisely set via an angle dial. This angle range ensures the adhesive flow is within the optimal shear rate range during the squeegee process, guaranteeing stable adhesive filling at the opening while minimizing adhesive residue.

[0047] The squeegee speed refers to the linear velocity of the squeegee moving horizontally. This can be achieved using a servo motor-driven lead screw transmission mechanism, with encoder feedback forming a closed-loop speed control. This speed range ensures a continuous and stable flow of adhesive on the stencil surface, preventing excessively low speeds from causing adhesive layer thickening or excessively high speeds from causing adhesive breakage.

[0048] Specifically, when using a pressure of 0.3 MPa and a 65° squeegee angle, the penetration depth of the adhesive at the opening of the stencil can be precisely controlled through vector decomposition of pressure and angle, ensuring a stable meniscus curvature at the opening edge. When the squeegee moves at a speed of 20 cm / s, the adhesive forms a continuous dragging flow on the stencil surface. Under the dynamic balance of surface tension and shear force, the adhesive can completely fill the opening without generating air bubbles or interrupting the flow. This combined control of the three parameters keeps the adhesive layer thickness deviation within ±5 μm, while reducing the single coating operation time to 60% of conventional methods.

[0049] Compared to existing technologies, traditional manual glue application lacks precise parameter control. Operators rely solely on experience to adjust pressure and speed, often resulting in glue layer thickness differences exceeding 20μm between adjacent LED beads. While existing automated dispensing equipment can control the glue volume, its point-by-point operation mode limits its application efficiency to only one-third of this solution. This solution, by establishing a quantitative parameter system for pressure, angle, and speed, achieves standardized control of the glue application process for the first time.

[0050] Through the above technical solution, this utility model solves the problem of localized glue leakage caused by incomplete glue filling, eliminates the wavy texture defect in the glue layer caused by parameter mismatch, and increases the single batch product qualification rate from 78% to over 95%. At the same time, it shortens the glue application cycle to 15 seconds per module, and operators only need to set parameters to complete standardized operations.

[0051] This invention further proposes that the mesh count of the screen printing stencil be selected between 200 and 450 mesh.

[0052] The mesh count of a screen printing stencil refers to the number of mesh openings per unit area, which can be achieved using different specifications such as 200 mesh, 300 mesh, or 450 mesh. When the mesh count is below 200 mesh, the mesh size is too large, resulting in excessively fast adhesive flow and potentially causing the adhesive layer thickness to exceed requirements. When the mesh count is above 450 mesh, the mesh size is too small, increasing adhesive flow resistance and potentially causing stencil clogging or incomplete adhesive application.

[0053] Specifically, by limiting the mesh size to the range of 200-450 mesh, the amount of adhesive penetrating through the mesh and the uniformity of its distribution can be controlled. Within this range, the mesh size ensures that the adhesive fully covers the surface of the LED beads 21 while avoiding abnormal increases in squeegee pressure due to excessively dense mesh. This range is suitable for different types of adhesives with varying viscosities; for example, a lower mesh size can be selected for high-viscosity adhesives to improve flowability, while a higher mesh size can be selected for low-viscosity adhesives to prevent overflow. Therefore, precise control of the adhesive layer thickness can be achieved without adjusting squeegee parameters or replacing equipment, while reducing the risk of squeegee clogging and extending the squeegee's lifespan.

[0054] Compared to existing technologies, current LED bead coating processes typically use screen printing stencils with a fixed mesh count, making it difficult to adapt to different adhesive properties or bead sizes, easily leading to low coating efficiency or adhesive layer defects. This solution, by limiting the mesh count range, allows for flexible selection of stencil specifications based on actual production needs, avoiding the poor process adaptability issues caused by a single mesh count and reducing the frequency of equipment maintenance due to inappropriate mesh sizes.

[0055] Through the above technical solution, this utility model solves the problems of low coating efficiency, uneven adhesive layer, and poor equipment adaptability caused by improper selection of screen printing stencil mesh count in the prior art. For example, when coating high-viscosity adhesives, using a 300-mesh stencil can increase the scraping speed while ensuring the integrity of the adhesive layer; when coating low-viscosity adhesives, using a 400-mesh stencil can prevent excessive adhesive penetration. Thus, while improving the stability of coating quality, it significantly reduces the difficulty of equipment debugging and the reliance on operator experience.

[0056] This invention further proposes that the screen on the screen printing plate is made of stainless steel wire or polyester wire.

[0057] Stainless steel wire refers to metal wire mesh made of iron-based alloy materials, specifically 304 or 316 stainless steel wire. Its high yield strength and tensile properties help maintain the stability of the opening shape. Polyester wire refers to synthetic fiber wire mesh made of polyethylene terephthalate, specifically woven from polyester fibers with a single filament diameter of 30-50μm. Its elastic modulus and resilience help maintain the flatness of the printed surface.

[0058] Specifically, during the adhesive coating process, the stainless steel wire mesh, under pressure from the squeegee, uses rigid support to prevent mesh deformation, ensuring a uniform flow of adhesive through the openings. The polyester wire mesh, on the other hand, relies on its material elasticity to compensate for stress fluctuations caused by the squeegee's movement, preventing damage to the mesh surface due to mechanical impact. When processing large-size LED bead arrays (21-bead arrays), the durability of the stainless steel wire mesh is suitable for continuous mass production; while in the trial production stage where rapid screen replacement is required, the low-cost characteristics of the polyester wire mesh better meet the needs of flexible production.

[0059] Compared to existing technologies, traditional screen printing processes mostly use nylon mesh or ordinary metal mesh. The former suffers from decreased printing accuracy due to elasticity degradation after long-term use, while the latter is too rigid to meet the coating requirements of LED beads of different sizes. This solution establishes a compatibility between the physical performance parameters of the two specific materials and the coating process by limiting their combined application.

[0060] Through the above technical solution, this utility model effectively controls the influence of the screen material on the uniformity of the adhesive layer thickness, and solves the problem of adhesive layer thickness deviation caused by screen deformation. It also takes into account the equipment durability requirements of industrial production and the cost control needs of the trial production stage, providing a reliable adhesive coating process foundation for the large-scale application of frameless transparent LED display modules.

[0061] Please see Figures 2-4 This utility model also proposes an adhesive application device, including an operating table 1. A fixing mechanism 11 for fixing an LED display module 2 is provided on the upper surface of the operating table 1. A gantry frame 3 is provided on both sides of the upper surface of the operating table 1. A screen printing stencil 4 is provided at the lower part of the gantry frame 3. An adhesive retention area 42 is left at each end of the screen printing stencil 4. The middle part of the screen printing stencil 4 is an adhesive application area 43. The screen printing stencil 4 is suspended above the LED display module 2. A lead screw and nut structure (not shown in the figure) is provided at the top of the gantry frame 3. A cylinder 31 is provided on the nut of the lead screw and nut structure. A scraper 32 is provided on the output rod of the cylinder 31.

[0062] The fixing mechanism 11 is a device used to constrain the position of the LED display module 2. Specifically, it can be implemented using a mechanical clamp with adjustable clamping force or an array of positioning pins. Planar positioning is achieved by clamping both sides of the LED display module 2 or inserting it into positioning holes. The gantry 3 is a double-column support structure spanning the operating table. Specifically, it can be implemented using welded metal profiles or bolted assembly. Its lower space is used to suspend the screen printing stencil 4 and form the adhesive application area 43. The screen printing stencil 4 is a printing template with openings matching the LED bead array 21. Specifically, it can be made of stainless steel or polyester wire mesh using photolithography. The opening positions correspond one-to-one with the LED beads 21 on the LED display module 2. The screw and nut structure is a transmission component that realizes the linear motion of the squeegee. Specifically, it can be implemented using a combination of a ball screw and a guide rail, used to control the horizontal movement trajectory of the squeegee 32. The cylinder 31 is a power element that provides the adhesive application pressure. Specifically, it can be implemented using a pneumatic linear actuator. The squeegee 32 installed at the end of the output rod can evenly push the adhesive into the opening of the screen printing stencil.

[0063] Specifically, the LED display module 2 is constrained to the surface of the operating table by a fixing mechanism. The double-column structure of the gantry 3 supports the screen printing stencil 4, which is suspended above the LED display module 2. The distance between the two is preset through mechanical adjustment. A screw and nut structure drives the cylinder and the scraper to move horizontally along the crossbeam of the gantry. The cylinder 31 applies vertical pressure to make the scraper 32 contact the surface of the screen printing stencil. When the adhesive is poured onto one end of the screen printing stencil, the scraper squeezes the adhesive through the opening of the stencil during its movement, forming an adhesive layer covering the surface of the LED beads 21. During this process, the fixing mechanism 11 maintains the stable position of the LED display module 2, the opening of the screen printing stencil 4 ensures that the adhesive accurately covers the target area, and the cylinder pressure and scraper speed parameters are adjustable to adapt to adhesives of different viscosities.

[0064] Compared to existing technologies, traditional dispensing machines rely on precision robotic arms for point-by-point coating, requiring complex programming and high-precision motion control. This solution, however, uses screen printing to achieve area-by-area dispensing, processing the entire module with a single squeegee stroke. Existing equipment requires a multi-axis motion platform and dispensing valves, while this device only needs screw drives and pneumatic components to complete the dispensing action, significantly simplifying the mechanical structure. In the dispensing process, each LED bead needs individual positioning and controlled dispensing volume; this solution uses openings in the screen printing stencil to transfer adhesive in batches, significantly improving dispensing efficiency.

[0065] Through the above technical solution, this utility model reduces the manufacturing cost and maintenance difficulty of the glue coating equipment. Operators can complete module positioning and glue coating parameter settings without professional programming skills. Using a mechanical squeegee instead of point-by-point dispensing allows for the coverage of the entire module in a single operation, significantly increasing glue coating output per unit time. Controlling the distance between the screen printing plate and the module, combined with squeegee pressure adjustment, ensures uniform glue layer thickness, avoiding glue layer defects caused by glue volume fluctuations in traditional dispensing processes.

[0066] This utility model further proposes that the screen printing stencil 4 is connected to the gantry frame 3 through a lifting mechanism 41, which is used to adjust the spacing between the screen printing stencil 4 and the LED display module 2.

[0067] The lifting mechanism 41 is a mechanical device that adjusts the vertical position. It can be implemented using a screw and nut structure, a hydraulic cylinder, or a rack and pinion structure. It generates linear displacement through power drive, thereby moving the screen printing stencil 4. This device performs height adjustment in the adhesive application device, allowing precise control of the distance between the screen printing stencil 4 and the LED display module 2.

[0068] The spacing between the screen printing stencil 4 and the LED display module 2 refers to the vertical distance between their surfaces, which can be achieved by setting different spacing parameters within the stroke range of the lifting mechanism 41. This spacing parameter directly affects the uniformity of adhesive transfer and the coating thickness; by adjusting this parameter, it can be adapted to adhesives of different viscosities or different coating precision requirements.

[0069] Specifically, when the adhesive thickness needs to be adjusted, the lifting mechanism 41 is driven to generate a vertical displacement, causing a change in the distance between the screen printing stencil 4 and the LED display module 2. For example, when the distance increases, the adhesive applied by the squeegee 32 forms a thicker adhesive layer during the transfer process; when the distance decreases, the adhesive layer thickness becomes thinner but the uniformity improves. The structural design of the screen printing stencil 4, connected by the gantry 3, ensures that the flatness is maintained during the lifting process, avoiding uneven force on the adhesive application area due to tilting. This adjustment process can be parametrically operated through an automated control system, for example, matching the adhesive application requirements of different display module models according to a preset program.

[0070] Compared with existing technologies, the spacing between the screen printing stencil and the workpiece in traditional glue coating equipment is mostly a fixed value, which cannot adapt to the changing requirements of different process parameters. However, this solution introduces an adjustable lifting mechanism 41, enabling a single device to cope with diverse glue coating requirements and eliminating problems such as uncontrollable glue thickness, glue waste, or coating defects caused by fixed spacing.

[0071] Through the above technical solution, this utility model realizes the dynamic adjustment of the distance between the screen printing plate 4 and the LED display module 2 in the glue coating device, enabling the same equipment to adapt to different glue coating thickness and precision requirements, and solving the problem of poor process adaptability caused by the fixed distance in traditional equipment. By precisely controlling the distance parameters, the glue transfer efficiency is optimized, the coating uniformity is improved, and glue layer damage or overflow caused by improper distance is avoided.

[0072] The present invention further proposes that the fixing mechanism 11 is a fixing clamp, used to clamp the LED display module 2 from both sides, and the height of the fixing clamp is lower than the thickness of the LED display module 2.

[0073] The fixing fixture refers to a device that applies clamping force to the module through a mechanical clamping structure. Specifically, it can be implemented using grippers with elastic elements or pneumatic clamps. Simultaneous clamping from both sides can balance the distribution of clamping force. The height of the fixing fixture being lower than the thickness of the module means that there is a gap between the top of the fixture and the upper surface of the module. This can be achieved by adjusting the installation position of the fixture or selecting clamping components of a specific height to prevent the fixture from protruding into the adhesive application area.

[0074] Specifically, during the adhesive application process, the LED display module 2 is placed on the operating table 1, and the fixing clamps on both sides simultaneously clamp the edges of the module. The clamping force is applied horizontally to prevent vertical displacement. Because the height of the clamps is lower than the thickness of the module, a spatial isolation is formed between the top of the clamps and the upper surface of the module, so that the squeegee 32 does not come into contact with the clamps when moving on the screen printing plate. Through the symmetrically distributed clamping points, the lateral force experienced by the LED display module 2 during the adhesive application is evenly offset, thereby maintaining positional stability.

[0075] In some specific embodiments, the clamping surface of the fixing fixture can cover 5%-20% of the area on both sides of the module, for example, by using adjustable-width jaws to accommodate modules of different sizes. The fixture height can be set to be 0.1-2mm lower than the module thickness, for example, by using a stepped mounting base to achieve the height difference.

[0076] Compared to existing technologies, when using double-sided clamping or positioning pins for fixation, the LED display module 2 is prone to displacement during the adhesive application process due to uneven force. This solution eliminates the problem of unbalanced force through a double-sided clamping structure, while the non-contact fixing design avoids the risk of physical interference.

[0077] Through the above technical solution, this utility model solves the problem of displacement or shaking of the LED display module 2 due to insecure fixing during the glue application process, ensuring that the opening of the screen printing plate 4 corresponds precisely to the position of the LED lamp bead 21, while avoiding collision and interference between the clamp, the scraper 32, and the screen printing plate 4, thus improving the glue application accuracy and operational safety.

[0078] The present invention further proposes that the fixing mechanism 11 is a row of positioning pins, which are used to position the LED display module 2 by inserting them into the positioning holes of the LED display module 2. The height of the positioning pins is lower than the upper surface of the LED display module 2.

[0079] The positioning pins are columnar structures that geometrically fit with the positioning holes. They can be made of metal or rigid plastic and achieve planar positioning constraints through multi-point insertion. "Row arrangement" refers to multiple positioning pins arranged linearly, using equal or non-equal spacing to enhance positioning stability through multi-point contact. Positioning holes are through-hole structures located at the edge or specific position of the LED display module. They can be formed through stamping or drilling processes, with their diameter matching the diameter of the positioning pins with a clearance or transition fit. "Height lower than the upper plane of the LED display module 2" means that the tip of the positioning pin maintains a vertical distance from the surface of the LED display module 2. This can be achieved by adjusting the installation height of the positioning pins or matching the thickness of the LED display module 2 to ensure that the positioning pins do not protrude from the surface of the LED display module 2.

[0080] Specifically, when the LED display module 2 is placed on the operating table 1, the positioning holes on its bottom correspond to the positioning pins arranged in rows on the operating table. By pressing down the LED display module 2, the positioning pins are fully inserted into the positioning holes, and the contact surface between the positioning pins and the hole walls restricts the horizontal displacement of the LED display module 2. Because the positioning pins are arranged in rows and inserted into multiple positioning holes, the degrees of freedom of the LED display module 2 in the X and Y axes are simultaneously constrained. The design of the positioning pin tips being lower than the upper plane of the module allows the screen printing stencil 4 to directly cover the module surface during the adhesive application process, avoiding interference between the positioning pins and the screen printing stencil 4. Simultaneously, the structural feature of the positioning pins being embedded inside the module eliminates the problem of occupying edge space when using clamps to hold the module from the side.

[0081] The LED display module 2 is fixed by inserting positioning pins into positioning holes. This mechanical approach directly restricts the degree of freedom of the module, and the positioning accuracy is determined by the tolerance of the pin-hole fit, thus avoiding the influence of clamping force control on positioning stability. Furthermore, the positioning pins are fully embedded under the module, preventing any protrusions on the module surface and providing unobstructed operating space for the scraper to fully cover the module surface for adhesive application.

[0082] Through the above technical solution, this utility model achieves precise positioning of the LED display module during the adhesive application process, preventing uneven adhesive application caused by obstruction or interference from the fixing device. The matching method between the positioning pin and the positioning hole ensures that the LED display module 2 does not shift during the adhesive scraping process, allowing the adhesive to completely cover the surface of the LED beads 21. The structural design of the positioning pin being lower than the upper plane of the module further avoids physical interference between the stencil and the fixing mechanism, ensuring the continuity and consistency of the adhesive application process.

[0083] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An LED lamp bead surface gluing device, characterized in that, The operation table (1) is provided with a fixing mechanism (11) for fixing the LED display module (2) on the upper surface of the operation table (1), and a gantry (3) is arranged on both sides of the upper surface of the operation table (1), a silk screen plate (4) is arranged at the lower part of the gantry (3), the silk screen plate (4) is suspended above the LED display module (2), a screw nut structure is arranged at the top of the gantry (3), a cylinder (31) is arranged on the nut of the screw nut structure, and a scraper (32) is arranged on the output rod of the cylinder (31).

2. The LED lamp bead surface gluing device according to claim 1, characterized in that, The silk screen plate (4) is connected with the gantry (3) through a lifting mechanism (41), which is used for adjusting the distance between the silk screen plate (4) and the LED display module (2).

3. The LED lamp bead surface gluing device according to claim 1 or 2, characterized in that, The fixing mechanism (11) is a fixing clamp, which is used for clamping the LED display module (2) from both sides of the LED display module (2), and the height of the fixing clamp is lower than the thickness of the LED display module (2).

4. The LED lamp bead surface gluing device according to claim 1 or 2, characterized in that, The fixing mechanism (11) is a row of positioning needles, which are used for being inserted into the positioning holes of the LED display module (2) to position the LED display module (2), and the height of the positioning needles is lower than the upper plane of the LED display module (2).

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