Rubber-coated frame of mobile phone middle plate and plastic film rubber feeding structure of rubber-coated frame

Abstract

The utility model discloses a rubber-coated frame of a mobile phone middle plate and a plastic film rubber feeding structure of the rubber-coated frame, an appearance part and a positioning part are arranged on the rubber-coated frame, the positioning part comprises two rows of positioning blocks, the mobile phone middle plate is arranged on a molding plastic film on a movable mold, and a rubber inlet is arranged on a fixed mold and is positioned in the center of the plurality of positioning blocks on the positioning part. According to the utility model, the positioning part is arranged on the rubber-coated frame, so that the rubber-coated frame can be stably coated on the mobile phone middle plate, and the rubber inlet of the mold is arranged at the center of the plurality of positioning blocks, so that the shearing forces of the mobile phone middle plate on the rubber liquid at the rubber inlet in all directions can be mutually counteracted, the phenomenon of rubber overflow of the rubber liquid on the mobile phone middle plate is reduced, and the service life of the mobile phone middle plate is prolonged. And in the injection molding process, glue liquid is injected from one row of positioning buckles in a multi-point and balanced mode, foreign matter such as a release agent and air in a cavity can be rapidly pushed into the other row of positioning buckles, the defects such as black spots or bubble spots formed on the appearance part are overcome, the forming efficiency is high, and the yield is high.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold technology, and in particular to the rubber-coated frame of a mobile phone midplate and the plastic film injection structure of the rubber-coated frame. Background Technology

[0002] With the trend towards lighter and more compact mobile phones, the dimensions of internal structural components have reached their limits. To ensure functionality, some designs use metal plates with plastic edging as the phone's mid-plate. In film molding design, based on product structural characteristics and assembly costs, in-mold molding is generally used, with the adhesive material directly molded onto the metal plate frame through multi-point injection. Since the sidewalls of the adhesive component are the exterior surfaces, the injection points can only be selected in a few small areas on the metal plate's end face. In actual production, due to the limited width of the injection nozzles, overflow and mold compression are very likely to occur at the side sealing points of the injection nozzles, affecting the appearance of the upper and lower end faces of the mid-plate and its assembly with other components. It also impacts the efficiency of continuous film production and mold life. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a rubber-coated frame for a mobile phone mid-plate and a plastic film injection structure for the rubber-coated frame. The rubber-coated frame has a positioning part that can stably cover the mobile phone mid-plate. The injection port on the molding die is located at the center of several positioning blocks on the positioning part, which can reduce the overflow of glue on the mobile phone mid-plate, avoid the molding failure, and extend the mold life. In addition, during the injection process, the glue is injected evenly from one row of positioning buckles at multiple points, which can quickly push the release agent and foreign objects such as air in the cavity into another row of positioning buckles, avoiding defects such as black spots or air bubbles on the appearance. The molding efficiency is high and the yield rate is high.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] The rubber-coated frame of the mobile phone mid-plate includes an integrally molded outer part and a positioning part. The outer part is a frame-shaped structure that is connected end to end and can fit and cover the outer contour sidewall of the mobile phone mid-plate. The positioning part is located on one side wall of the outer part and can fit and be embedded in the mobile phone mid-plate. The positioning part includes two rows of parallel positioning buckles. Each row of positioning buckles includes several positioning blocks arranged in a straight line along the inner wall of the outer part. Each positioning block is a dovetail structure and its smaller end is connected to the outer part. Its upper or lower end face is flush with the upper or lower end face of the mobile phone mid-plate.

[0006] As a further explanation of the above technical solution:

[0007] In the above technical solution, the outer wall of the exterior part is an arc surface that bulges outward, and several clearance holes are formed thereon.

[0008] In the above technical solution, several of the positioning blocks are equally spaced on one side of the inner wall of the exterior part.

[0009] In the above technical solution, the upper and lower surfaces of all the positioning blocks are coplanar and are all located on the inner side of both ends of the exterior part.

[0010] Another technical solution adopted by this utility model is as follows:

[0011] The plastic film injection structure for the coated frame is located on the fixed mold of the plastic film; the plastic film is used to form the coated frame described in the previous technical solution, wherein:

[0012] The plastic film is provided with a movable mold, and the end of the movable mold facing the fixed mold is formed with a first cavity that is adapted to the lower end of the outer part. The inner side of the first cavity is provided with a positioning structure for fixing the middle plate of the mobile phone.

[0013] The fixed mold has a mold core at the end facing the moving mold. The fixed mold core has a glue inlet channel and a second cavity. The glue inlet channel includes a plurality of first channels, second channels and third channels. Each first channel and second channel is located at the end of the fixed mold core away from the moving mold. One end of each first channel is connected to the liquid storage tank of the plastic film through a main channel, and the other end is connected to a plurality of second channels. One end of each third channel is connected to a second channel, and the other end passes through the fixed mold core and is connected to the second cavity. The second cavity is located at the end of the fixed mold core facing the moving mold and can cover the outer contour of the mobile phone middle plate and the first cavity when the mold is closed. A first protrusion adapted to the positioning part is formed on its inner wall. A second protrusion is provided on the periphery of each third channel on the first protrusion. The height of each second protrusion is lower than the thickness of a positioning block, and after the mold is closed, each second protrusion is located directly above the center of a positioning block on the mobile phone middle plate.

[0014] In the above technical solution, a hot nozzle is provided on each of the third flow channels on the fixed mold core, and each hot nozzle is provided with a temperature control structure.

[0015] In the above technical solution, the fixed mold core is provided with a number of fourth flow channels at the end away from the second cavity, and the two ends of each fourth flow channel are respectively connected to the two adjacent third flow channels.

[0016] In the above technical solution, the projections of several first flow channels and second flow channels on the fixed mold core are symmetrically arranged on the inner side of the second cavity, and several second flow channels connected to the same first flow channel are symmetrically arranged on the periphery of a first flow channel.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a positioning part on the rubber-coated frame that can be embedded in the mobile phone mid-plate, it can be ensured that the rubber-coated frame can be stably covered on the mobile phone mid-plate, thereby protecting and beautifying the appearance of the mobile phone mid-plate and ensuring its outer contour insulation; by setting the glue inlet at the center of several positioning blocks on the positioning part, the shear forces of the mobile phone mid-plate on the glue inlet at all directions can be mutually canceled, thereby reducing the glue overflow phenomenon in the mobile phone mid-plate and thus avoiding the molding phenomenon, extending the mold life. In addition, during the molding process, the glue is injected evenly from one row of positioning buckles at multiple points, which can quickly push the release agent and foreign objects such as air in the cavity into another row of positioning buckles, avoiding the formation of defects such as black spots or bubble points on the appearance. The molding efficiency is high and the yield rate is high. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the glued frame in this embodiment;

[0019] Figure 2 This is an enlarged view of part A in Figure 1;

[0020] Figure 3 This is a schematic diagram of the mold core structure in this embodiment;

[0021] Figure 4 This is a structural schematic diagram of the mold core from another perspective in this embodiment;

[0022] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of BB;

[0023] Figure 6 yes Figure 5 Enlarged view of section C;

[0024] Figure 7 This is a schematic diagram of the injection structure in this embodiment (the injection channel is referred to as the sprue after molding, and the fixed mold core and moving mold structure are not shown).

[0025] Figure 8 yes Figure 7 Enlarged view of section D in the middle.

[0026] In the diagram: 10, Mobile phone middle plate; 20, Glue-coated frame; 21, Appearance part; 22, Positioning part; 30, Fixed mold core; 40, Hot nozzle; 1, Positioning block; 3, Second cavity; 4, First runner; 5, Second runner; 6, Third runner; 7, Fourth runner; 8, First protrusion; 9, Second protrusion. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings.

[0028] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] like Figure 1-2As shown, the rubber-coated frame 20 of the mobile phone middle plate 10 includes an integrally formed outer part 21 and a positioning part 22. The outer part 21 is a frame-shaped structure that is connected end to end and can match and cover the outer contour side wall of the mobile phone middle plate 10. The positioning part 22 is provided on one side wall of the outer part 21 and can match and be embedded in the mobile phone middle plate 10. The positioning part 22 includes two rows of parallel positioning buckles. Each row of positioning buckles includes several positioning blocks 1 arranged in a straight line along the inner wall of the outer part 21. Each positioning block 1 is a dovetail structure and its smaller end is connected to the outer part 21. Its upper or lower end face is flush with the upper or lower end face of the mobile phone middle plate 10.

[0030] Specifically, the outer wall of the exterior part 21 is an arc surface that protrudes outward, and several clearance slots are formed thereon.

[0031] Specifically, several positioning blocks 1 are equally spaced on one side of the inner wall of the exterior part 21.

[0032] Specifically, the upper and lower surfaces of all positioning blocks 1 are coplanar and are located on the inner side of both ends of the appearance part 21.

[0033] In this embodiment, the positioning part 22 on the rubber-coated frame 20 is embedded on the upper and lower ends of the mobile phone middle plate 10, and its outer appearance part 21 is connected end to end to cover the outer wall of the mobile phone middle plate 10, so as to maintain a good and stable connection with the mobile phone middle plate 10, thereby achieving the purpose of protecting and beautifying its appearance and ensuring its outer contour insulation.

[0034] In the above embodiment, the glue-feeding structure for the molded plastic film of the overmolded frame 20 is provided on the fixed mold of the plastic film, wherein:

[0035] like Figure 3-8 As shown, the plastic film injection structure for the coated frame is located on the fixed mold of the plastic film; the plastic film is used to form the coated frame 20 in the above embodiment, wherein:

[0036] A moving mold is provided on the plastic film. The end of the moving mold facing the fixed mold has a first cavity that is adapted to the lower end of the appearance part 21. The inner side of the first cavity is provided with a positioning structure for fixing the middle plate 10 of the mobile phone.

[0037] A mold core 30 is set at the end of the fixed mold facing the moving mold. The fixed mold core 30 is provided with a sprue channel and a second cavity. The sprue channel includes several first channels 4, second channels 5, and third channels 6. Each first channel 4 and second channel 5 is located at the end of the fixed mold core 30 away from the moving mold. One end of each first channel 4 is connected to the liquid storage tank of the plastic film through a main channel, and the other end is connected to several second channels 5. One end of each third channel 6 is connected to a second channel 5, and the other end passes through the fixed mold core 30. The mold core 30 is connected to the second cavity 3: the second cavity 3 is located at the end of the fixed mold core 30 facing the moving mold and can cover the outer contour of the mobile phone middle plate 10 and the first cavity when the mold is closed. A first protrusion 8 adapted to the positioning part 22 is formed on its inner wall. A second protrusion 9 is provided on the periphery of each third flow channel 6 on the first protrusion 8. The height of each second protrusion 9 is lower than the thickness of a positioning block 1, and after the mold is closed, each second protrusion 9 is located directly above the center of a positioning block 1 on the mobile phone middle plate 10.

[0038] For ease of demonstration and understanding, Figure 7 The term "sprue structure" after molding refers to the inlet channel. It can be seen that during injection molding, the molten adhesive from the main channel simultaneously flows into multiple first channels 4, and after several second channels 5 and several third channels 6, the flow rate, volume, and temperature of the adhesive are repeatedly adjusted and distributed before being injected into the cavity formed by the first cavity, the second cavity 3, and the mobile phone middle plate 10. From... Figure 8 As can be seen, the glue inlet is located at the center of the upper row of multiple positioning blocks 1. The shear forces of the glue at the glue inlet on the middle plate 10 of the mobile phone can be roughly canceled out, which can reduce the glue overflow phenomenon in the middle plate 10 of the mobile phone and thus avoid the mold compression phenomenon, ensuring the service life of the mold.

[0039] The composition of the fixed mold structure and the moving mold structure on the plastic film is existing technology and common knowledge for those skilled in the art, so its specific structure will not be described in detail here.

[0040] Furthermore, to better control the temperature of the adhesive during injection into the mold cavity, a hot nozzle 40 is provided on each of the third flow channels 6 on the fixed mold core 30, and each hot nozzle 40 is equipped with a temperature control structure. The function and structure of the hot nozzles on the plastic film are existing technologies and are common knowledge to those skilled in the art; therefore, their specific structure and temperature control principle will not be elaborated here.

[0041] Furthermore, in order to balance the flow rate and velocity of the adhesive in each hot nozzle, the fixed mold core 30 is provided with several fourth flow channels 7 on the end opposite to the second cavity 3, and the two ends of each fourth flow channel 7 are respectively connected to the two adjacent third flow channels 6.

[0042] In this embodiment, the mobile phone middle plate 10 has a rectangular structure. The projections of several first flow channels 4 and second flow channels 5 onto the fixed mold core 30 are symmetrically arranged inside the second cavity 3. Several second flow channels 5 connected to the same first flow channel 4 are symmetrically arranged around the periphery of a first flow channel 4. The adhesive is injected evenly from multiple points into a row of positioning buckles, which can push the release agent and foreign matter such as air in the cavity into the next row of positioning buckles, avoiding defects such as black spots or air bubbles on the outer surface 21 and ensuring molding quality. In application, the number and position of the adhesive inlet channels on each sidewall can be reasonably set according to the overall size of the overmolded frame 20 to avoid the formation of black spots or air bubbles on the outer surface 21.

[0043] This invention, by providing a positioning part 22 on the coated frame 20 that can be embedded into the mobile phone middle plate 10, ensures that the coated frame 20 can be stably wrapped on the mobile phone middle plate 10, thereby protecting and beautifying the appearance of the mobile phone middle plate 10 and ensuring its outer contour insulation. By setting the glue inlet at the center of several positioning blocks 1 on the positioning part 22, the shear forces of the end of the mobile phone middle plate 10 on the glue inlet are balanced and can be roughly canceled out, thereby reducing the glue overflow phenomenon in the mobile phone middle plate 10 and thus avoiding the molding phenomenon, extending the mold life. In addition, during the molding process, the glue is injected evenly from one row of positioning buckles at multiple points, which can quickly push the release agent and foreign objects such as air in the cavity into another row of positioning buckles, avoiding the formation of defects such as black spots or air bubbles on the appearance part 21. The molding efficiency is high and the yield rate is high.

[0044] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. The glued frame of the middle plate of a mobile phone, characterized in that, The device includes an integrally formed outer surface and a positioning part. The outer surface is a frame-shaped structure that is connected end to end and can fit and cover the outer contour sidewall of the mobile phone's middle plate. The positioning part is located on one side wall of the outer surface and can fit and be embedded in the mobile phone's middle plate. The positioning part includes two rows of parallel positioning buckles. Each row of positioning buckles includes several positioning blocks arranged in a straight line along the inner wall of the outer surface. Each positioning block is a dovetail structure and its smaller end is connected to the outer surface. Its upper or lower end face is flush with the upper or lower end face of the mobile phone's middle plate.

2. The glued frame of the mobile phone midplate according to claim 1, characterized in that, The outer wall of the exterior part is an arc surface that bulges outward, and several clearance slots are formed thereon.

3. The glued frame of the mobile phone midplate according to claim 1, characterized in that, Several of the aforementioned positioning blocks are equally spaced on one side of the inner wall of the exterior part.

4. The glued frame of the mobile phone midplate according to claim 1, characterized in that, The upper and lower surfaces of all the positioning blocks are coplanar and are located on the inner side of both ends of the exterior part.

5. A plastic film injection structure for a coated frame, disposed on a fixed mold of the plastic film; characterized in that: The plastic film is used to form the overmolded frame as described in any one of claims 1-4, wherein: The plastic film is provided with a movable mold, and the end of the movable mold facing the fixed mold is formed with a first cavity that is adapted to the lower end of the outer part. The inner side of the first cavity is provided with a positioning structure for fixing the middle plate of the mobile phone. The fixed mold has a mold core at the end facing the moving mold. The fixed mold core has a glue inlet channel and a second cavity. The glue inlet channel includes a plurality of first channels, second channels and third channels. Each first channel and second channel is located at the end of the fixed mold core away from the moving mold. One end of each first channel is connected to the liquid storage tank of the plastic film through a main channel, and the other end is connected to a plurality of second channels. One end of each third channel is connected to a second channel, and the other end passes through the fixed mold core and is connected to the second cavity. The second cavity is located at the end of the fixed mold core facing the moving mold and can cover the outer contour of the mobile phone middle plate and the first cavity when the mold is closed. A first protrusion adapted to the positioning part is formed on its inner wall. A second protrusion is provided on the periphery of each third channel on the first protrusion. The height of each second protrusion is lower than the thickness of a positioning block, and after the mold is closed, each second protrusion is located directly above the center of a positioning block on the mobile phone middle plate.

6. The plastic film adhesive injection structure for the coated frame according to claim 5, characterized in that, Each of the three flow channels is provided with a hot nozzle on the fixed mold core, and each hot nozzle is provided with a temperature control structure.

7. The plastic film adhesive injection structure for the coated frame according to claim 5, characterized in that, The fixed mold core is provided with several fourth flow channels at the end away from the second cavity, and the two ends of each fourth flow channel are respectively connected to the two adjacent third flow channels.

8. The plastic film adhesive injection structure for the coated frame according to claim 5, characterized in that, The projections of several first flow channels and second flow channels on the fixed mold core are symmetrically arranged on the inner side of the second cavity, and several second flow channels connected to the same first flow channel are symmetrically arranged on the periphery of a first flow channel.

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