LED module grid mask and injection mold thereof

Abstract

This invention discloses an LED module mesh face mask, relating to the field of LED module processing. It includes a face mask body, a drainage component, and a moisture-proof component. The back of the face mask body has several mounting grooves and several threaded holes. It also discloses an injection mold for the LED module mesh face mask, including a mold assembly. This assembly includes a connecting frame, on which an upper mold and a pressing cylinder are fixedly connected, and a lower mold is slidably connected. The output end of the pressing cylinder is fixedly connected to the lower mold via a mounting base. An ejector assembly includes a hydraulic cylinder fixedly connected to the mounting base and several miniature ejector pins that are movably inserted into the side wall of the lower mold. A positioning protrusion is fixedly connected to the top of each miniature ejector pin. This invention improves the protective capability of the face mask through its drainage and moisture-proof components, and the ejector assembly of the injection mold makes the mesh face mask less prone to damage during ejection.

Description

Technical Field

[0001] This invention relates to the field of LED module processing technology, specifically to an LED module mesh mask and its injection mold. Background Technology

[0002] As LED displays develop towards higher density and higher reliability, the requirements for module covers are increasing. Traditional LED module covers are mostly pure mesh plastic structures, whose main function is to shield the solder pads and solder paste of LED chips to improve ink uniformity and provide some protection against impacts.

[0003] However, existing technologies have significant shortcomings:

[0004] Limitations of the mask's functionality: Traditional mesh masks are not waterproof or dustproof, and the LED chips are easily corroded when exposed to the environment; installation often uses multi-point screw fixing, which is inefficient; overall protection is weak, and the protection of the LED chips is limited.

[0005] Manufacturing challenges: Demolding a face mask with a dense mesh structure after injection molding is a major challenge; the shrinkage of the plastic after cooling creates a huge clamping force on a large number of small ribs; if conventional ejection methods are used, the ejection force is unevenly distributed, which can easily lead to the ribs "pulling white" (stress whitening), deformation or even breakage, affecting product yield and appearance strength, and also aggravating the wear of the mold ejector pins. Summary of the Invention

[0006] The purpose of this invention is to provide an LED module mesh cover and its injection mold, which solves the problem that existing LED mesh covers cannot be waterproof and dustproof, and that LED beads are easily corroded when exposed to the environment.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An LED module mesh mask, comprising:

[0009] The mask body has several mounting slots arranged in an array on its back side, as well as several threaded holes for fixing the mask body. The mounting slots are used to embed LED modules.

[0010] The drainage assembly includes several drainage holes, several ventilation slots, and wiring slots on the mask body. The ventilation slots are arranged between two adjacent mounting slots to connect adjacent mounting slots and form a ventilation and drainage path. A row of mounting slots at the bottom of the mask body is connected to the drainage holes through the wiring slots.

[0011] A moisture-proof component includes a dust plug removably inserted into the drain hole, and a desiccant disposed on the dust plug and located inside the drain hole.

[0012] An injection mold for producing mesh masks for LED modules, comprising:

[0013] A mold assembly includes a connecting frame on which an upper mold and a pressing cylinder are fixedly connected, and a lower mold is slidably connected. The output end of the pressing cylinder is fixedly connected to the lower mold via a mounting base.

[0014] The ejector assembly includes a hydraulic cylinder fixedly connected to a mounting base and a plurality of miniature ejector pins that are movably inserted into the side wall of the lower mold. The top of each miniature ejector pin is fixedly connected to at least one positioning protrusion to enhance the ejection contact area. The plurality of miniature ejector pins are arranged at the intersection of ribs corresponding to the array of mounting grooves on the back of the mask body. The output end of the hydraulic cylinder is fixedly connected to a connecting seat for placing the plurality of miniature ejector pins.

[0015] Several plug-in components are disposed on a connector for detachably connecting several miniature pins to the side wall of the connector.

[0016] Furthermore, the plug-in assembly includes a pressure plate assembly, a snap-fit ​​assembly, and a locking pin assembly;

[0017] The pressure plate assembly includes:

[0018] A flat shaft seat is fixedly connected to the tail of a miniature ejector pin;

[0019] Several storage slots are provided on the connecting seat, and their inner walls are matched with the outer walls of several flat bearing seats.

[0020] The pressure plate is detachably connected to the connecting seat via a locking pin assembly;

[0021] Several perforations are made on the side wall of the pressure plate for the passage of miniature ejector pins;

[0022] The two sides of the flat shaft seat are fixed by pressure plates and connecting seats, respectively.

[0023] Furthermore, the end of the perforation near the flat bearing seat is provided with a stepped enlarged hole, which forms a receiving opening for accommodating the flat bearing seat.

[0024] Furthermore, the snap-fit ​​assembly includes:

[0025] Several elastic positioning strips are fixedly connected to both sides of the inner wall of the storage slot;

[0026] Several positioning notches are provided on both sides of the side wall of the flat bearing seat, and they cooperate with several elastic positioning strips.

[0027] Furthermore, the locking pin assembly includes:

[0028] Several positioning rods are fixedly connected to the side wall of the pressure plate;

[0029] Several positioning slots are provided on the side wall of the connector and cooperate with the positioning rod;

[0030] Several pin holes are formed on the side wall of the positioning rod;

[0031] Several pins are provided in the holes of the connecting seat and are used to pass through the pin holes to fix the pressure plate.

[0032] Furthermore, the plug-in assembly also includes a positioning component;

[0033] Several external threaded sections are fixedly installed on the outside of the pin shaft;

[0034] Several threaded sleeves are fixedly installed on the outer wall of the connecting seat, and their inner walls are provided with internal threads that mate with the external thread section.

[0035] Once the pin is inserted into the pin hole, the pin can be axially locked by screwing it in.

[0036] Compared with the prior art, the LED module mesh mask and its injection mold provided by the present invention can effectively cope with external dust and condensation caused by temperature difference or external moisture infiltration through the installation groove, drainage component and moisture-proof component; water vapor can flow laterally along the ventilation groove between the installation grooves and gather to the bottom, and be smoothly discharged from the drain hole through the wiring groove; at the same time, the removable dust plug has a built-in drying block that can absorb residual moisture, realizing dual protection of drainage and moisture-proof, and improving the working stability and life of the display screen in complex environments such as humid and rainy conditions.

[0037] By using injection molds to target the structural characteristics of mesh face masks, miniature ejector pins with positioning protrusions are arranged at the intersections of the ribs. The number of protrusions is configured differently according to their location (corners, edges, interiors) to ensure that the ejection force is evenly distributed and fits the product structure. This design can reduce the whitening or breakage of ribs during ejection, ensure the demolding integrity of complex mesh face masks, reduce mold wear, and extend their service life. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0039] Figure 1 This is a schematic diagram of the overall structure provided in Embodiment 1 of the present invention;

[0040] Figure 2This is a schematic diagram of the overall structure in another direction provided in Embodiment 1 of the present invention;

[0041] Figure 3 This is a cross-sectional view of the main body of the mask provided in Embodiment 1 of the present invention;

[0042] Figure 4 Provided for Embodiment 1 of the present invention Figure 3 Enlarged view of section A in the middle;

[0043] Figure 5 This is a schematic diagram of the overall structure provided in Embodiment 2 of the present invention;

[0044] Figure 6 This is an exploded view of the plug-in assembly provided in Embodiment 2 of the present invention;

[0045] Figure 7 Provided for Embodiment 2 of the present invention Figure 6 Enlarged view of section B in the middle;

[0046] Figure 8 This is a cross-sectional view of the plug-in assembly and connector provided in Embodiment 2 of the present invention;

[0047] Figure 9 This is a cross-sectional view of the pressure plate provided in Embodiment 2 of the present invention;

[0048] Figure 10 This is a cross-sectional view of the connector provided in Embodiment 2 of the present invention;

[0049] Figure 11 Provided for Embodiment 2 of the present invention Figure 10 Enlarged view of section C.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Mask body; 2. Drainage assembly; 3. Moisture-proof assembly; 11. Mounting slot; 12. Threaded hole; 21. Drain hole; 22. Ventilation slot; 23. Wiring slot; 31. Dust plug; 32. Drying block; 4. Mold assembly; 5. Ejector pin assembly; 6. Connecting assembly; 41. Connecting bracket; 42. Upper mold; 43. Pressing cylinder; 44. Lower mold; 45. Mounting base; 51. Hydraulic cylinder; 52. Miniature ejector pin; 53. Positioning protrusion 54. Connecting seat; 61. Pressure plate assembly; 611. Flat shaft seat; 612. Storage slot; 613. Pressure plate; 614. Through hole; 615. Receiving opening; 62. Snap-fit ​​assembly; 621. Elastic positioning strip; 622. Positioning notch; 63. Locking pin assembly; 631. Positioning rod; 632. Positioning slot; 633. Pin hole; 634. Pin shaft; 64. Positioning assembly; 641. External thread section; 642. Threaded sleeve. Detailed Implementation

[0052] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0053] Example 1:

[0054] Please see Figures 1 to 4 This embodiment provides an LED module mesh mask, including:

[0055] The mask body 1 has a plurality of mounting slots 11 arranged in an array on its back side, and a plurality of threaded holes 12 for fixing the mask body 1. The distribution of the plurality of threaded holes 12 corresponds one-to-one with the three rows and four columns of mounting slots 11. The plurality of mounting slots 11 are used to embed LED modules.

[0056] The drainage component 2 includes a plurality of drainage holes 21, a plurality of ventilation slots 22 and wiring slots 23 provided on the mask body 1. The ventilation slots 22 are arranged between two adjacent mounting slots 11 to connect adjacent mounting slots 11 and form a ventilation and drainage path. A row of mounting slots 11 located at the bottom of the mask body 1 is connected to the drainage holes 21 through the wiring slots 23.

[0057] The moisture-proof component 3 includes a dust plug 31 that is detachably inserted into the drain hole 21, and a drying block 32 disposed on the dust plug 31 and located inside the drain hole 21.

[0058] Working principle: During operation, the LED modules are first embedded one by one into the mounting grooves 11 on the back of the main body 1 of the mask, and then the bolts are used to fix the main body 1 of the mask through the threaded holes 12. Subsequently, the removable dust plug 31 with the drying block 32 integrated is inserted into the drain hole 21 at the bottom of the mask. Its function is to: by precisely corresponding the threaded holes 12 with the matrix layout of the LED modules, this design effectively reduces the number of bolts used, while ensuring the uniformity of the force distribution during mask installation, thereby avoiding the problem of mask deformation or loosening caused by local stress concentration. When condensation occurs inside the mask due to temperature changes or a small amount of water vapor seeps in, the water vapor can flow laterally along the ventilation grooves 22 between the mounting grooves 11, eventually converging at the bottom, and the liquid water is discharged from the box through the wiring grooves 23 connected to the drain hole 21. The drying block 32 actively absorbs residual moisture, thereby achieving efficient passive drainage and active moisture prevention, significantly improving the long-term reliability of the LED display module in complex environments.

[0059] Example 2:

[0060] Please see Figures 4 to 11 This embodiment provides an injection mold for producing the LED module mesh mask in Embodiment 1, comprising:

[0061] The mold assembly 4 includes a connecting frame 41, on which an upper mold 42 and a pressing cylinder 43 are fixedly connected, and a lower mold 44 is slidably connected. The output end of the pressing cylinder 43 is fixedly connected to the lower mold 44 through a mounting base 45.

[0062] The ejector assembly 5 includes a hydraulic cylinder 51 fixedly connected to the mounting base 45 and a plurality of miniature ejector pins 52 that are movably inserted into the side wall of the lower mold 44. At least one positioning protrusion 53 is fixedly connected to the top of the miniature ejector pins 52 to enhance the ejection contact area. The plurality of miniature ejector pins 52 are arranged at the intersection of ribs corresponding to the array distribution of the mounting grooves 11 on the back of the mask body 1. The output end of the hydraulic cylinder 51 is fixedly connected to a connecting seat 54 for placing the plurality of miniature ejector pins 52.

[0063] Several plug-in components 6 are disposed on the connector 54 for detachably connecting several miniature pins 52 to the side wall of the connector 54.

[0064] When the mold is working, the lower mold 44 and the upper mold 42 are first closed by the pressing cylinder 43 for injection molding. After cooling, the pressing cylinder 43 drives the lower mold 44 and the molded mask inside to move downward to open the mold. Then the hydraulic cylinder 51 pushes the connecting seat 54 and the micro ejector pin 52 to move upward. The positioning protrusion 53 on the top of the ejector pin acts precisely on the intersection of the mask ribs, and applies force evenly to push the product out of the mold smoothly, effectively preventing the ribs from turning white or breaking. The ejector pin can be quickly disassembled and replaced through the plug-in component 6, which is convenient for maintenance. Its core is to achieve uniform and precise ejection of the high-density mesh mask by strategically arranging the micro ejector pin 52 with positioning protrusion 53, which significantly improves the demolding quality and mold life.

[0065] The plug-in assembly 6 includes a pressure plate assembly 61, a snap-fit ​​assembly 62, and a locking pin assembly 63;

[0066] Pressure plate assembly 61 includes:

[0067] The flat shaft seat 611 is fixedly connected to the tail of the miniature ejector pin 52;

[0068] Several storage slots 612 are provided on the connecting seat 54, and their inner walls cooperate with the outer walls of several flat shaft seats 611.

[0069] Pressure plate 613 is detachably connected to connecting seat 54 via locking pin assembly 63;

[0070] Several perforations 614 are formed on the side wall of the pressure plate 613 for the micro-ejector pins 52 to pass through;

[0071] The two sides of the flat shaft seat 611 are fixed by pressure plate 613 and connecting seat 54 respectively.

[0072] Align the flat shaft seat 611 and place it into the corresponding slot 612 of the connecting seat 54. At this time, the snap-fit ​​assembly 62 will provide initial temporary positioning for the flat shaft seat 611. Then, pass the through hole 614 on the pressure plate 613 over the miniature ejector pin 52 and cover the connecting seat 54, so that the flat shaft seat 611 is confined between the slot 612 and the pressure plate 613. Finally, use the locking pin assembly 63 to fasten the pressure plate 613 to the connecting seat 54, thereby completing the quick and reliable installation of the miniature ejector pin 52. Its core function is to realize the modular assembly and disassembly of the miniature ejector pin 52, improving the efficiency of mold maintenance and adjustment.

[0073] The end of the perforation 614 near the flat bearing 611 is provided with a stepped enlarged hole, which forms a receiving opening 615 for accommodating the flat bearing 611.

[0074] When installing the pressure plate 613, the operator places the pressure plate 613 onto the miniature ejector pin 52. The enlarged receiving opening 615 at the upper end of its through hole 614 provides initial guidance and receiving space for the flat shaft seat 611. During the pressing down of the pressure plate 613, the flat shaft seat 611 can be easily guided into the pressure plate 613 with the help of the receiving opening 615, so that the flat shaft seat 611 is confined between the placement groove 612 and the pressure plate 613, and then fixed by the locking pin assembly 63. The main function of this design is to significantly reduce the alignment accuracy requirements during assembly. Through the guiding and fault-tolerant function of the receiving opening 615, the flat shaft seats 611 of multiple ejector pins can be initially positioned quickly and easily at the same time, improving the installation efficiency and operation convenience of the pressure plate 613.

[0075] The card-connecting component 62 includes:

[0076] Several elastic positioning strips 621 are fixedly connected to both sides of the inner wall of the storage groove 612;

[0077] Several positioning recesses 622 are formed on both sides of the side wall of the flat bearing seat 611, and they cooperate with several elastic positioning strips 621.

[0078] When the flat shaft seat 611 at the tail of the miniature ejector pin 52 is placed into the storage groove 612 of the connecting seat 54, the positioning recess 622 on the side wall of the flat shaft seat 611 will contact the elastic positioning strip 621 on the inner wall of the storage groove 612, and force the elastic positioning strip 621 to deform during the pressing process; when the flat shaft seat 611 is fully in place, the elastic positioning strip 621 will then spring back and lock into the positioning recess 622, producing a clear tactile feedback; its core function is to provide pre-positioning and temporary locking, which improves the reliability and efficiency of the assembly process.

[0079] Locking pin assembly 63 includes:

[0080] Several positioning rods 631 are fixedly connected to the side wall of the pressure plate 613;

[0081] Several positioning slots 632 are provided on the side wall of the connecting seat 54 and cooperate with the positioning rod 631;

[0082] Several pin holes 633 are formed on the side wall of the positioning rod 631;

[0083] Several pins 634 are disposed in the holes of the connecting seat 54 and are used to pass through the pin holes 633 to fix the pressure plate 613.

[0084] After the initial alignment of the pressure plate 613 is completed, the operation steps of the locking pin assembly 63 are as follows: First, align the positioning rod 631 and insert it into the corresponding positioning slot 632 to achieve precise pre-positioning of the pressure plate 613; then, insert the pin 634, which is pre-placed in the hole of the connecting seat 54, laterally so that it passes through the pin hole 633 on the positioning rod 631, thereby completing the final mechanical locking of the pressure plate 613. Its core function is to achieve a fast, accurate, and reliable rigid connection of the pressure plate 613, which facilitates the daily maintenance of the mold and the replacement of the ejector pin array.

[0085] The plug-in assembly 6 also includes a positioning assembly 64;

[0086] Several external threaded sections 641 are fixedly installed on the outside of the pin 634;

[0087] Several threaded sleeves 642 are fixedly installed on the outer wall of the connecting seat 54, and their inner walls are provided with internal threads that mate with the external thread section 641.

[0088] When the pin 634 is inserted into the pin hole 633, the pin 634 can be axially locked by screwing it.

[0089] After the pin 634 is inserted into the pin hole 633 to complete the basic connection, the tail end of the pin 634 is further screwed in, causing the external thread section 641 on its shaft to screw into the threaded sleeve 642 fixed on the outer wall of the connecting seat 54. This rotational action drives the pin 634 to produce a slight forward displacement in the axial direction, thereby tightly tightening the pin 634, the positioning rod 631, and the connecting seat 54 to achieve rigid locking. Its core function is to provide an adjustable and highly reliable axial locking force based on a simple pin structure.

[0090] Working principle:

[0091] First, the lower mold 44 and upper mold 42 are closed by the pressing cylinder 43, plastic is injected and cooled to form an LED module mask with dense grid ribs. After the mold opens, the hydraulic cylinder 51 pushes the connecting seat 54 and a set of miniature ejector pins 52 upwards simultaneously. These ejector pins are regularly configured with different numbers of positioning protrusions 53 according to their positions (corners, edges or interiors) in the grid matrix on the back of the corresponding product. This allows the protrusions to act precisely at the intersection of the mask ribs. The increased contact area through differentiation achieves a uniform and stable ejection force distribution, thereby smoothly and without damage ejecting the complex mask product from the mold, effectively preventing rib damage. In addition, the ejector pins are radially positioned by the cooperation of the tail flat shaft seat 611 and the placement groove 612 on the connecting seat 54, and are quickly pressed and fixed by the pressure plate 613 with guide receiving port 615 and locking pin assembly 63. This modular design allows the entire ejector pin system to be easily assembled, disassembled and maintained as a whole, ensuring the reliability and efficiency of the mold in long-term operation.

[0092] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A mesh mask for an LED module, characterized in that, include: The mask body (1) has a plurality of mounting slots (11) arranged in an array on its back side, and a plurality of threaded holes (12) for fixing the mask body (1). The plurality of mounting slots (11) are used to embed LED modules. The drainage component (2) includes several drainage holes (21), several ventilation slots (22) and wiring slots (23) on the mask body (1). The ventilation slots (22) are arranged between two adjacent mounting slots (11) to connect adjacent mounting slots (11) and form a ventilation and drainage path. A row of mounting slots (11) at the bottom of the mask body (1) is connected to the drainage holes (21) through the wiring slots (23). The moisture-proof component (3) includes a dust plug (31) removably inserted into the drain hole (21) and a drying block (32) disposed on the dust plug (31) and located inside the drain hole (21).

2. An injection mold for producing the LED module mesh mask as described in claim 1, characterized in that, include: The mold assembly (4) includes a connecting frame (41), on which an upper mold (42) and a pressing cylinder (43) are fixedly connected, and a lower mold (44) is slidably connected. The output end of the pressing cylinder (43) is fixedly connected to the lower mold (44) through a mounting base (45). The ejector assembly (5) includes a hydraulic cylinder (51) fixedly connected to the mounting base (45) and a plurality of miniature ejector pins (52) that are movably inserted into the side wall of the lower mold (44). The top of each miniature ejector pin (52) is fixedly connected to at least one positioning protrusion (53). The plurality of miniature ejector pins (52) are arranged at the intersection of ribs corresponding to the array distribution of the mounting grooves (11) on the back of the mask body (1). The output end of the hydraulic cylinder (51) is fixedly connected to a connecting seat (54) for placing the plurality of miniature ejector pins (52). Several plug-in components (6) are disposed on a connector (54) for detachably connecting several micro-pins (52) to the side wall of the connector (54).

3. The LED module mesh mask injection mold according to claim 2, characterized in that, The plug-in assembly (6) includes a pressure plate assembly (61), a snap-fit ​​assembly (62), and a locking pin assembly (63). The pressure plate assembly (61) includes: A flat shaft seat (611) is fixedly connected to the tail of a miniature ejector pin (52); Several storage slots (612) are provided on the connecting seat (54), and their inner walls are matched with the outer walls of several flat shaft seats (611); The pressure plate (613) is detachably connected to the connecting seat (54) via a locking pin assembly (63); Several perforations (614) are formed on the side wall of the pressure plate (613) for the passage of micro-ejector pins (52); The two sides of the flat shaft seat (611) are fixed by pressure plate (613) and connecting seat (54) respectively.

4. The LED module mesh mask injection mold according to claim 3, characterized in that, The perforation (614) near the end of the flat bearing seat (611) is provided with a stepped enlarged hole, which forms a receiving opening (615) for accommodating the flat bearing seat (611).

5. The LED module mesh mask injection mold according to claim 3, characterized in that, The snap-fit ​​assembly (62) includes: Several elastic positioning strips (621) are fixedly connected to both sides of the inner wall of the storage groove (612); Several positioning recesses (622) are provided on both sides of the side wall of the flat bearing seat (611) and cooperate with several elastic positioning strips (621).

6. The LED module mesh mask injection mold according to claim 3, characterized in that, The locking pin assembly (63) includes: Several positioning rods (631) are fixedly connected to the side wall of the pressure plate (613); Several positioning slots (632) are provided on the side wall of the connecting seat (54) and cooperate with the positioning rod (631); Several pin holes (633) are formed on the side wall of the positioning rod (631); Several pins (634) are provided in the holes of the connecting seat (54) and are used to pass through the pin holes (633) to fix the pressure plate (613).

7. The LED module mesh mask injection mold according to claim 6, characterized in that, The plug-in assembly (6) also includes a positioning assembly (64). Several external threaded sections (641) are fixedly installed on the outside of the pin (634); Several threaded sleeves (642) are fixedly installed on the outer wall of the connecting seat (54), and their inner walls are provided with internal threads that mate with the external thread section (641); When the pin (634) is inserted into the pin hole (633), the pin (634) can be axially locked by screwing it.

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