Injection mold for manufacturing protective panel of display screen

Abstract

The utility model relates to the technical field of injection molds, in particular to an injection mold for manufacturing a display screen protection panel. The utility model discloses an injection mold for manufacturing a display screen protection panel. A front mold cavity position is formed in the front mold core, the front mold cavity position comprises a diaphragm containing position and an edge position arranged on the outer edge of the diaphragm containing position, and a front mold glue inlet hole is formed in the edge position; the rear mold frame is positioned on one side of the front mold frame; the rear mold core is provided with a rear mold cavity position matched with the front mold cavity position; and the melt flow guide piece is provided with a melt buffer cavity and a melt flow guide channel. According to the scheme, the display screen protection panel is manufactured through the injection mold, and the display screen protection panel has higher impact resistance, falling resistance and explosion resistance while high transparency is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to an injection mold for manufacturing a protective panel of a display screen. Background Art

[0002] A transparent protection panel is usually installed on the display screen of an elevator to protect the display screen from physical damage, such as scratches and collisions; it is also used to prevent impurities such as dust and water droplets from entering the interior of the display screen and affecting the display effect; the transparent panel can also make the display screen look cleaner and more beautiful, and be coordinated with the overall design style of the elevator.

[0003] In the prior art, the transparent protection panel on the display screen of an elevator usually adopts a glass plate. For example, a glass display screen and a glass monitor disclosed in a Chinese utility model with the publication number CN208054685U both adopt a transparent glass substrate.

[0004] However, the above-mentioned solution using a glass plate still has the following deficiencies: Although the glass plate can ensure transparency, it has high process requirements, is easy to break, and has insufficient impact resistance and explosion-proof ability.

[0005] Therefore, how to develop an injection mold that can manufacture a display screen substrate with high impact resistance, drop resistance, explosion proof and high transparency to overcome the above shortcomings has become a research topic for those skilled in the art. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an injection mold for manufacturing a protective panel of a display screen in view of the deficiencies of the prior art.

[0007] The utility model realizes the above purpose through the following technical solutions: An injection mold for manufacturing a protective panel of a display screen includes:

[0008] A front mold base;

[0009] A front mold core, which is arranged on the side wall of the front mold base and is formed with a front mold cavity position. The front mold cavity position includes a diaphragm accommodating position and a rim position arranged on the outer edge of the diaphragm accommodating position. A front mold injection hole is arranged on the rim position;

[0010] A rear mold base, located on one side of the front mold base;

[0011] A rear mold core, which is arranged on the side wall of the rear mold base close to the front mold base and has a rear mold cavity position matching the front mold cavity position; and

[0012] The melt guiding member is arranged on the front mold core and / or the rear mold core. The melt guiding member is provided with a melt buffer cavity and a melt guiding channel. The melt buffer cavity is respectively communicated with the front mold feeding hole and the melt guiding channel. One end of the melt guiding channel far away from the melt buffer cavity is communicated with the front mold cavity position and / or the rear mold cavity position.

[0013] As a further solution of the present utility model: The injection mold for manufacturing the display protection panel further includes:

[0014] The front template is provided with a front mold injection port;

[0015] The runner plate is arranged on one side of the front template and is provided with a runner cavity communicated with the front mold injection port. The side far away from the front template is provided with a runner outlet;

[0016] The ejector pin plate is arranged on the side of the rear mold base far away from the front mold base and has ejector pins; and

[0017] The rear template is arranged on the side of the ejector pin plate far away from the rear mold base;

[0018] Wherein, the front mold base is arranged on the side of the runner plate far away from the front template, and the front mold base is provided with a front mold runner hole communicated with the runner outlet.

[0019] As a further solution of the present utility model: When the front mold core and the rear mold core are closed, the front mold cavity position and the rear mold cavity position form the cavity of the injection mold;

[0020] The melt guiding channel has a horn structure. One end with a larger channel opening of the melt guiding channel is communicated with the melt buffer cavity, and one end with a smaller channel opening of the melt guiding channel is communicated with the cavity of the injection mold.

[0021] As a further solution of the present utility model: The melt guiding channel has a horn structure. One end with a larger channel opening of the melt guiding channel is communicated with the melt buffer cavity, and one end with a smaller channel opening of the melt guiding channel is a melt injection port. The melt injection port faces and is adjacent to the edge position and is communicated with the front mold cavity position.

[0022] As a further solution of the present utility model: The edge position is provided with a limiting convex.

[0023] As a further solution of the present utility model: At a position of the rear mold cavity position opposite to the edge position, there are a forming hole and a guide hole column pushed by the ejector pin and inserted into the forming hole.

[0024] The beneficial effects of the present utility model:

[0025] In this solution, by setting an injection mold for manufacturing a display screen protection panel, the PMMA film can be placed into the cavity of the injection mold, specifically into the film accommodation position of the front mold cavity of the front mold core. After closing the mold and injecting the injection melt, the PMMA film and the injection melt are thermoplastically formed, thereby manufacturing a display screen protection panel. While ensuring high transparency, it can also have higher impact resistance, drop resistance, and explosion-proof performance. Among them, the setting of the melt flow guiding part enables the flow rate of the injection melt to enter the cavity of the injection mold only after being buffered by the melt buffer cavity and the melt diversion channel of the melt flow guiding part. Thus, the obtained finished product, i.e., the display screen protection panel, will not cause adverse effects on the appearance such as flushing and bubbles on its surface, and the surface of the finished product will not be damaged when removed, affecting the overall aesthetic feeling. Brief Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the display screen protection panel described in the present utility model.

[0027] Figure 2 It is a schematic diagram of the planar structure and enlarged partial structure of the display screen protection panel described in the present utility model.

[0028] Figure 3 It is a schematic structural diagram of the PMMA film described in the present utility model.

[0029] Figure 4 It is a schematic structural diagram of the injection mold in the closed mold state described in the present utility model.

[0030] Figure 5 It is a schematic structural diagram of loading the PMMA film into the front mold cavity of the front mold core when the injection mold is in the open mold state described in the present utility model.

[0031] Figure 6 It is a schematic structural diagram of the injection mold in the open mold state and after removing the finished product after injection molding described in the present utility model.

[0032] Figure 7 It is an exploded schematic structural diagram of the injection mold described in the present utility model.

[0033] Figure 8 It is Figure 7 A schematic structural diagram from another perspective.

[0034] Figure 9 It is a schematic structural diagram and an exploded schematic diagram of the melt flow guiding part described in the present utility model.

[0035] Figure 10 It is a schematic structural diagram of the front mold core and the rear mold core in the closed mold state described in the present utility model.

[0036] Figure 11 This is a schematic structural diagram of the front mold core and the PMMA film of the present utility model.

[0037] Figure 12 This is a schematic structural diagram and a partially enlarged schematic structural diagram of removing the finished product from the rear mold core after the injection mold of the present utility model is opened. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model; the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] As Figures 1 to 12 shown, in the embodiment of the present utility model, a display screen protection panel 1 is provided, including: an acrylic layer 11 and a plastic layer 12 provided on one side of the acrylic layer 11.

[0041] In this solution, a PMMA film 3 is added to the injection molding material. Specifically, one side of the PMMA film 3 is thermoplastically fused with the injection molding melt formed by the injection molding material and molded to obtain the display screen protection panel 1, which includes an acrylic layer 11 corresponding to the PMMA film 3 and a plastic layer 12 corresponding to the injection molding material. Furthermore, the transparency of the entire product can be effectively improved. Specifically, the part covered by the acrylic layer 11 has higher smoothness and transparency. At the same time, compared with the glass substrate in the prior art, the display screen protection panel 1 of this solution has higher impact resistance, drop resistance and explosion-proof performance, is not easily broken, and has lower production costs.

[0042] Among them, the injection molding material uses PC injection molding material or ABS injection molding material.

[0043] It should be mentioned that:

[0044] The English abbreviation of polycarbonate is PC, also known as PC plastic; it is a high molecular polymer containing carbonate groups in the molecular chain. According to the structure of the ester group, it can be divided into various types such as aliphatic, aromatic, and aliphatic-aromatic. Among them, due to the low mechanical properties of aliphatic and aliphatic-aromatic polycarbonates, their applications in engineering plastics are limited.

[0045] ABS plastic is a terpolymer of three monomers: acrylonitrile (A), butadiene (B), and styrene (S). The relative contents of the three monomers can vary arbitrarily to form various resins.

[0046] In one embodiment, the display screen protection panel 1 is obtained by injection molding on one side of the acrylic layer 11. The acrylic layer 11 is a PMMA layer, and the plastic layer 12 is a PC layer or an ABS layer. Furthermore, the transparency of the entire product is further improved. Specifically, the part covered by the acrylic layer 11 has further improved smoothness and transparency. At the same time, compared with the glass substrate in the prior art, the display screen protection panel 1 of this solution further improves the impact resistance, drop resistance and explosion-proof performance, is not easily broken, and further reduces the production cost.

[0047] In another embodiment, as Figure 1As shown, the plastic layer 12 includes a main body layer and a peripheral edge layer. The main body layer mates with and is in contact with the acrylic layer 11. The peripheral edge layer is disposed on a side of the main body layer away from the acrylic layer 11, and the outer edge of the peripheral edge layer extends beyond the main body layer. Specifically, the nut mounting portion 121 is provided with a nut mounting groove 122 for mounting and placing nuts. Specifically, the nut is fixed in the nut mounting groove 122 of the nut mounting portion 121 by hot melting, and thus the nut is disposed in the display screen protection panel 1 in advance to further improve the applicability and assembly convenience. Further, the transparency of the entire product is further improved, specifically, the portion covered by the acrylic layer 11 has further improved smoothness and transparency. At the same time, compared with the glass substrate in the prior art, the display screen protection panel 1 of this solution further improves the impact resistance, drop resistance and explosion-proof performance, is not easily broken, and further reduces the manufacturing cost.

[0048] In another embodiment, a nut mounting portion 121 is provided on a side of the outer edge away from the acrylic layer 11, and the nut mounting portion 121 is provided with a nut mounting groove 122; the outer edge is further provided with a bayonet and a hook, and the hook extends beyond the side of the outer edge away from the acrylic layer 11; the side of the outer edge away from the acrylic layer 11 further has a break point that mates with the melt injection port 252a of the melt guiding member 25. Further, there is less manufacturing cost and it will not damage the surface of the finished product and affect the overall aesthetics.

[0049] In another embodiment, the thickness ratio of the plastic layer 12 is 60% - 90%. Specifically, 70% is preferred. Further, the transparency of the entire product is further improved, specifically, the portion covered by the acrylic layer 11 has further improved smoothness and transparency. At the same time, compared with the glass substrate in the prior art, the display screen protection panel 1 of this solution further improves the impact resistance, drop resistance and explosion-proof performance, is not easily broken, and further reduces the manufacturing cost.

[0050] In yet another embodiment, the thickness ratio of the plastic layer 12 is 95% - 99%. Specifically, 98% is preferred. Further, the transparency of the entire product is further improved, specifically, the portion covered by the acrylic layer 11 has further improved smoothness and transparency. At the same time, compared with the glass substrate in the prior art, the display screen protection panel 1 of this solution further improves the impact resistance, drop resistance and explosion-proof performance, is not easily broken, and further reduces the manufacturing cost.

[0051] In another embodiment, the thickness of the plastic layer 12 is 3.9 mm to 3.95 mm, and the thickness of the acrylic layer 11 is 0.05 mm to 0.1 mm. Specifically, the total thickness of the display screen protection panel 1 is 4 mm. Furthermore, the transparency of the entire product is further improved. Specifically, for the part covered by the acrylic layer 11, its smoothness and transparency are further enhanced. At the same time, compared with the glass substrate in the prior art, the display screen protection panel 1 of this solution further improves the impact resistance, drop resistance, and explosion-proof performance, is not easily broken, and further reduces the manufacturing cost.

[0052] In another embodiment, a manufacturing method of a display screen protection panel 1 includes the following steps: a material preparation step, a feeding step, an injection molding step, and a blanking step. Among them:

[0053] Material preparation step: Prepare injection plastic and a PMMA film 3 with a predetermined thickness, where the injection plastic is PC injection plastic or ABS injection plastic;

[0054] Feeding step: See Figure 5 , feed the injection plastic into the injection molding machine, and place the PMMA film 3 at the front mold cavity position 221 of the front mold core 22 of the injection mold 2 on the injection molding machine;

[0055] Injection molding step: See Figure 4 , close the injection mold 2, the front mold cavity position 221 of the front mold core 22 and the rear mold cavity position of the rear mold core 24 form the cavity of the injection mold 2, inject the injection melt from the injection port of the front mold frame 21 of the front mold frame 21, the injection melt enters the melt buffer cavity 251 of the melt flow guiding member 25, then flows to the melt diversion channel 252, and is injected into the cavity of the injection mold 2 from the melt injection port 252a of the melt diversion channel 252, so that the injection plastic and the PMMA film 3 are thermoplastically fused. The injection melt also flows into the forming hole 241a in the rear mold cavity position until it is dried, cooled, formed, and solidified to obtain a finished product. The finished product includes an acrylic layer 11 corresponding to the PMMA film 3 and a plastic layer 12 corresponding to the injection melt;

[0056] First mold opening step: Open the injection mold 2, separate the front mold core 22 and the rear mold core 24. The finished product is located in the rear mold cavity position of the rear mold core 24. The nut installation part 121 of the finished product is inserted into the forming hole 241a, the guide hole column 241b in the forming hole 241a is inserted into the nut installation groove 122 of the nut installation part 121, and the horn waste part 253 in the melt flow guiding member 25 is connected to the outer edge of the finished product;

[0057] Second mold opening step: The ejector plate 28 drives the ejector pins 281 to eject the finished product. The ejector pins 281 push the guide hole columns 241b to insert into and abut against the nut installation groove 122 of the nut installation part 121, so that the nut installation part 121 of the finished product is pushed out of the forming hole 241a. The horn waste part 253 is disconnected and separated from the outer edge of the finished product, and a fracture point is formed at the disconnection position between the outer edge of the finished product and the horn waste part 253.

[0058] First blanking step: See Figure 12 and Figure 6 , pull out the nut installation groove 122 on the nut installation part 121 from the guide hole column 241b, so as to take out the finished product;

[0059] Second blanking step: Take out the horn waste part 253 from the melt flow guiding part 25, and reset the melt flow guiding part 25;

[0060] Circulation step: Circulate and execute the feeding step to the second blanking step.

[0061] In this solution, by adding a layer of PMMA film 3 on the PC injection molding material, specifically, one side of the PMMA film 3 is thermally fused and formed with the PC injection molding material, so as to obtain the display screen protection panel 1, including the acrylic layer 11 corresponding to the PMMA film 3 and the plastic layer 12 corresponding to the PC injection molding material. Furthermore, the transparency of the whole product can be effectively improved. Specifically, for the part covered by the acrylic layer 11, its smoothness and transparency are higher. At the same time, compared with the glass substrate in the prior art, the display screen protection panel 1 of this solution has higher impact resistance, drop resistance and explosion-proof performance, is not easy to break, and has lower production cost.

[0062] In another embodiment, in the material preparation step, preparing the PMMA film 3 with the predetermined thickness includes: stretching the PMMA material or pressing it into a PMMA film 3 with a thickness of 0.05 mm to 0.1 mm by a high-pressure molding machine;

[0063] The feeding step further includes: One side of the PMMA film 3 abuts against the film accommodating position 221a of the front mold cavity position 221;

[0064] Between the second blanking step and the circulation step, there is also included:

[0065] Nut pre-setting step: Place the nut in the nut installation groove 122 on the nut installation part 121 and fix it by hot melting, specifically by a hot melting machine. Furthermore, the transparency of the whole product is further improved. Specifically, for the part covered by the acrylic layer 11, its smoothness and transparency are further improved. At the same time, compared with the glass substrate in the prior art, the display screen protection panel 1 of this solution further improves the impact resistance, drop resistance and explosion-proof performance, is not easy to break, and further reduces the production cost.

[0066] In another embodiment, a limiting clamping opening 31 is provided at the edge of the PMMA diaphragm 3, and a limiting clamping convex 221e that can be clamped into the limiting clamping opening 31 is provided at the edge position 221b of the front mold cavity position 221. A forming hole 241a for forming the nut mounting portion 121 on the finished product and a guide hole column 241b inserted into the forming hole 241a are provided in the cavity position of the rear mold holder 23 of the rear mold core 24. Specifically, a guide hole column 241b is provided in the forming hole 241a, so that the nut mounting portion 121 and the nut mounting groove 122 on the nut mounting portion 121 can be formed during injection molding. Furthermore, the nut can be pre-fixed to the nut mounting groove 122 by hot melting to improve the convenience of later installation. Furthermore, the transparency of the entire product is further improved, specifically, the part covered by the acrylic layer 11 has further improved smoothness and transparency. At the same time, compared with the glass substrate of the prior art, the display screen protection panel 1 of this solution further improves the impact resistance, drop resistance and explosion-proof performance, is not easy to break, and further reduces the production cost.

[0067] As Figures 1 to 12 shown, in the embodiment of the present invention, an injection mold 2 for manufacturing the display screen protection panel 1 is also provided. Refer to Figures 7 to 12 , including: a front template 26, a runner plate 27, a front mold holder 21, a front mold core 22, a rear mold core 24, a rear mold holder 23, a thimble plate 28, a rear template 29 and a melt flow guiding member 25. Among them:

[0068] The front template 26 is provided with a front mold injection port 261;

[0069] The runner plate 27 is arranged on one side of the front template 26, is provided with a runner cavity 271 communicated with the front mold injection port 261, and is provided with a runner outlet 272 on the side far away from the front template 26;

[0070] The front mold holder 21 is arranged on the side of the runner plate 27 far away from the front template 26, and is provided with a front mold runner hole 211 communicated with the runner outlet 272;

[0071] The front mold core 22 is arranged on the side wall of the front mold holder 21 far away from the runner plate 27, and a front mold cavity position 221 is formed. The front mold cavity position 221 includes a diaphragm accommodating position 221a and an edge position 221b arranged on the outer edge of the diaphragm accommodating position 221a. A front mold feed hole 221c communicated with the front mold runner hole 211 is provided on the edge position 221b;

[0072] The rear mold holder 23 is located on the side of the front mold holder 21 far away from the runner plate 27;

[0073] The rear mold core 24 is disposed on the side wall of the rear mold base 23 close to the front mold base 21, and has a rear mold cavity position 241 matching the front mold cavity position 221. After the front mold core 22 and the rear mold core 24 are clamped, the front mold cavity position 221 and the rear mold cavity position 241 form the cavity of the injection mold 2;

[0074] The melt flow guiding member 25 is disposed on the front mold core 22 and / or the rear mold core 24. The melt flow guiding member 25 is provided with a melt buffer cavity 251 and a melt diversion channel 252. The melt buffer cavity 251 is respectively communicated with the front mold injection hole 221c and the melt diversion channel 252. The melt diversion channel 252 has a certain arc bending structure. One end of the melt diversion channel 252 is communicated with the melt buffer cavity 251, and the other end is communicated with the front mold cavity position 221 and / or the rear mold cavity position 241, so that the injection melt is ejected from the melt diversion channel 252 and enters the cavity of the injection mold 2;

[0075] The ejector pin plate 28 is disposed on the side of the rear mold base 23 away from the front mold base 21 and has ejector pins 281;

[0076] The rear template 29 is disposed on the side of the ejector pin plate 28 away from the rear mold base 23. Specifically, the injection melt is injected from the front mold injection port 261 of the front template 26, enters the runner cavity 271 of the runner plate 27, and exits from the runner outlet 272 of the runner plate 27 into the front mold runner hole 211 of the front mold base 21, then enters the front mold injection hole 221c of the front mold core 22, then enters the melt buffer cavity 251 of the melt flow guiding member 25 from the front mold injection hole 221c, then flows into the melt diversion channel 252 of the melt flow guiding member 25, and is injected into the cavity of the injection mold 2 from the melt injection port 252a of the melt diversion channel 252.

[0077] In this solution, by providing an injection mold 2 for manufacturing the display screen protection panel 1, the PMMA film 3 can be placed in the cavity of the injection mold 2, specifically in the film accommodation position 221a of the front mold cavity position 221 of the front mold core 22. After clamping and injecting the injection melt, the PMMA film 3 and the injection melt are thermoplastically formed, so as to manufacture a display screen protection panel 1, which has higher impact resistance, drop resistance and explosion protection while ensuring high transparency. Among them, the setting of the melt flow guiding member 25 enables the flow rate of the injection melt to be buffered by the melt buffer cavity 251 and the melt diversion channel 252 of the melt flow guiding member 25 before entering the cavity of the injection mold 2. The finished product obtained in this way, that is, the display screen protection panel 1, will not cause appearance defects such as flushing and bubbles on its surface, and will not damage the surface of the finished product when the finished product is removed, thus affecting the overall aesthetic feeling.

[0078] It should be noted that through repeated research by the inventor, it is found that without the melt flow guiding member 25, the finished product will form a glue inlet bump at the connection with the glue outlet of the cavity where the injection molding melt is ejected, which will affect the overall appearance of the finished product. Therefore, it is necessary to additionally set a milling step to remove the glue inlet bump. However, with the setting of the melt flow guiding member 25 in this solution, the flow rate of the injection molding melt can be buffered through the melt buffer cavity 251 and the melt diversion channel 252 of the melt flow guiding member 25 before entering the cavity of the injection mold 2. The obtained finished product, namely the display screen protection panel 1, will not be affected by appearance defects such as flushing and bubbles on its surface. And when the mold is opened, after the ejector plate 28 ejects the display screen protection panel 1, the horn waste piece 253 in the melt flow guiding member 25 can be automatically broken and separated from the display screen protection panel 1, leaving a tiny notch point that does not affect the overall appearance on the edge layer of the display screen protection panel 1. The manufacturing cost is low, the appearance is good, and no glue inlet bump will be generated. Therefore, there is no need for an additional processing step to mill off the glue inlet bump of the finished product.

[0079] Manufacturing process of the display screen protection panel 1:

[0080] First, in the open mold state, the PMMA film 3 is installed on the front mold cavity position 221 of the front mold core 22 by clamping the limit clamping port 31 of the PMMA film 3 to the limit clamping convex 221e of the front mold cavity position 221, specifically installed in the film accommodating position 221a of the front mold cavity position 221.

[0081] Then, close the mold. The front mold base 21 and the rear mold base 23 are closed, the front mold core 22 and the rear mold core 24 are closed. The front mold cavity position 221 of the front mold core 22 and the rear mold cavity position 241 of the rear mold core 24 form the cavity of the injection mold 2. And the melt buffer cavity 251 of the melt flow guiding member 25 on the rear mold core 24 is communicated with the front mold glue inlet hole 221c of the front mold core 22, and the melt diversion channel 252 of the melt flow guiding member 25 is communicated with the cavity of the injection mold 2, so that the melt injection port 252a of the melt diversion channel 252 can face the front mold cavity position 221 of the front mold core 22, specifically the edge position 221b of the front mold cavity position 221 to eject the injection molding melt.

[0082] Next, perform injection molding. Inject the injection molding melt from the injection gate 261 of the front mold plate 26. The injection molding melt passes through the runner plate 27, the front mold base 21, and the front mold core 22, and then enters the melt buffer cavity 251 of the melt guide member 25 through the front mold gate hole 221c of the front mold core 22, so that the flow rate of the injection molding melt can be buffered. Then, the injection molding melt flows from the melt buffer cavity 251 of the melt guide member 25 to the melt diversion channel 252 and is ejected from the melt injection gate 252a of the melt diversion channel 252. Specifically, it is ejected towards the PMMA film 3 located on the front mold cavity position 221 of the front mold core 22. Thus, the injection molding melt enters the cavity of the injection mold 2 from the melt injection gate 252a of the melt guide member 25 and is fully heat-melted and fused with the PMMA film 3;

[0083] Then, cool for a certain period of time, specifically 70s - 100s, preferably 80s - 90s, to cool and form the injection molding melt in the cavity; among them, the injection molding melt in the melt buffer cavity 251 and the melt diversion channel 252 within the melt guide member 25 will also be cooled together and form the horn waste part 253. Since the melt diversion channel 252 is connected to the cavity of the injection mold 2, before mold opening, the horn waste part 253 is connected to the outer edge of the finished product, that is, the display screen protection panel 1;

[0084] Finally, perform mold opening. The front mold base 21 and the rear mold base 23 are opened, and the front mold core 22 and the rear mold core 24 are opened to obtain the finished product, that is, the display screen protection panel 1; and because the forming hole 241a is provided on the rear mold cavity position 241 of the rear mold core 24, and the guide hole column 241b, that is, the ejector pin 281, extends into the forming hole 241a, so when mold opening, the display screen protection panel 1 can form the nut installation part 121. And because the nut installation groove 122 of the nut installation part 121 is formed by the guide hole column 241b, so when mold opening, the nut installation groove 122 of the nut installation part 121 is inserted onto the guide hole column 241b, making the finished product, that is, the display screen protection panel 1, located on the rear mold cavity position 241 of the rear mold core 24 when mold opening. And when the guide hole column 241b is the ejector pin 281, the ejector plate 28 ejects the ejector pin 281, and then the finished product, that is, the display screen protection panel 1, can be ejected from the rear mold cavity position 241 of the rear mold core 24. At the same time, the horn waste part 253 is disconnected and separated from the display screen protection panel 1, so that the display screen protection panel 1 forms a break point at the break where it is disconnected from the horn waste part 253. Finally, the operator can remove the finished product, that is, the display screen protection panel 1; then a new PMMA film 3 can be reinstalled on the front mold cavity position 221 of the front mold core 22, and then the next new finished product can be injection molded.

[0085] In addition, since the PMMA film 3 is snapped into the limiting clamping protrusion 221e of the front mold cavity position 221 through the limiting clamping opening 31, the limiting clamping protrusion 221e can protrude from the PMMA film 3. During injection molding, the limiting clamping protrusion 221e can form a bayonet and a hook on the finished product, making the finished product, i.e., the display protection panel 1, easier to install on the display screen of the elevator. Specifically, by presetting a buckling portion on the outer side edge of the display screen of the elevator that matches the hook, the hook can be directly aligned with the buckling portion and snapped and engaged during installation, thereby clamping the display protection panel 1 tightly on the display screen of the elevator.

[0086] In one embodiment, as Figure 9 shown, the melt drainage channel 252 has a horn structure. Specifically, the channel opening of the melt drainage channel 252 gradually becomes smaller from large. The large end of the channel opening is connected to the melt buffer cavity 251, and the small end of the channel opening is the melt injection port 252a, which is connected to the cavity of the injection mold 2, that is, connected to the front mold cavity position 221 and / or the rear mold cavity position 241, so as to inject the injection melt into the cavity of the injection mold 2. Specifically, since the channel opening at the melt injection port 252a is smaller, when the ejector plate 28 ejects the display protection panel 1 after mold opening, it is easier for the display protection panel 1 to be disconnected and separated from the horn-shaped waste piece 253, and the break point formed on the display protection panel 1 is smaller, thus not affecting the overall appearance.

[0087] Preferably, the melt injection port 252a faces the edge position 221b of the front mold cavity position 221 and is adjacent to the edge position 221b.

[0088] Preferably, the melt guiding member 25 is arranged on the rear mold core 24, and the melt injection port 252a injects melt towards the front mold cavity position 221 of the front mold core 22, specifically, towards the edge position 221b of the front mold cavity position 221. Since the PMMA film 3 is placed in the front mold cavity of the front mold core 22, this arrangement of the injection direction is more conducive to the full thermal melting of the injection melt and the PMMA film 3, and the transparency and impact resistance of the final finished product, i.e., the display protection panel 1, will also be better.

[0089] In another embodiment, as Figure 5 and Figure 11 shown, the edge position 221b of the front mold cavity position 221 is provided with a limiting clamping protrusion 221e for mating and clamping with the limiting clamping opening 31 of the PMMA film 3, so as to fix the PMMA film 3 firmly on the front mold cavity position 221.

[0090] In yet another embodiment, as Figure 6 and Figure 12As shown, a forming hole 241a is provided at a position of the rear mold cavity 241 opposite to the edge position 221b of the front mold cavity 221, and a guide hole column 241b is inserted into the forming hole 241a, so as to form the nut mounting portion 121 of the display screen protection panel 1. Specifically, the forming hole 241a is used to form the outer contour of the nut mounting portion 121, and the guide hole column 241b forms a nut mounting groove 122 for placing nuts on the nut mounting portion 121. Furthermore, the nut can be pre-fixed to the nut mounting groove 122 by hot melting to improve the convenience of later installation. After the ejector plate 28 ejects the display screen protection panel 1 during mold opening, the guide hole column 241b can still be inserted into the nut mounting groove 122, so that the display screen protection panel 1 will not fall off after being ejected, and thus it is easy for the operator to take. Among them, the guide hole column 241b can be replaced by the ejector pin 281 on the ejector plate 28, or the guide hole column 241b is arranged at the end of the ejector pin 281 on the ejector plate 28 and is telescoped in the forming hole 241a by the ejection of the ejector pin 281 on the ejector plate 28, that is, both the ejector pin 281 and the guide hole column 241b extend into the forming hole 241a. During mold opening, the ejector pin 281 pushes the guide hole column 241b, and then ejects the finished product.

[0091] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An injection mold for manufacturing a display screen protection panel, characterized in that: include: front mold frame (21); A front mold core (22) is disposed on a side wall of the front mold frame (21) and is formed with a front mold cavity (221), wherein the front mold cavity (221) comprises a diaphragm accommodating position (221a) and an edge position (221b) disposed on the outer edge of the diaphragm accommodating position (221a), and a front mold glue inlet hole (221c) is provided on the edge position (221b); A rear mold frame (23), located on one side of the front mold frame (21); a rear mold core (24), which is disposed on a side wall of the rear mold frame (23) close to the front mold frame (21), and has a rear mold cavity position (241) matching the front mold cavity position (221); and A molten material flow guide (25) is provided on the front mold core (22) and / or the rear mold core (24), and is provided with a molten material buffer chamber (251) and a molten material drainage channel (252); the molten material buffer chamber (251) is respectively connected to the front mold glue inlet hole (221c) and the molten material drainage channel (252); and one end of the molten material drainage channel (252) away from the molten material buffer chamber (251) is connected to the front mold cavity position (221) and / or the rear mold cavity position (241).

2. The injection mold for manufacturing a display screen protection panel according to claim 1, characterized in that: The injection mold for manufacturing the display protection panel also includes: A front mold plate (26) is provided with a front mold glue injection port (261); A flow channel plate (27) is provided on one side of the front mold plate (26), and is provided with a flow channel cavity (271) communicating with the front mold injection port (261), and is provided with a flow channel injection port (272) on a side away from the front mold plate (26); an ejector plate (28), disposed on a side of the rear mold frame (23) away from the front mold frame (21), and having an ejector pin (281); and A rear mold plate (29) is arranged on a side of the ejector plate (28) away from the rear mold frame (23); The front mold frame (21) is arranged on a side of the flow channel plate (27) away from the front mold plate (26), and the front mold frame (21) is provided with a front mold flow channel hole (211) connected to the flow channel glue outlet (272).

3. The injection mold for manufacturing a display screen protection panel according to claim 1, characterized in that: When the front mold core (22) and the rear mold core (24) are molded together, the front mold cavity (221) and the rear mold cavity (241) form a mold cavity of the injection mold; The molten material guide channel (252) is in a bull horn structure; the end with a larger channel opening of the molten material guide channel (252) is in communication with the molten material buffer cavity (251); and the end with a smaller channel opening of the molten material guide channel (252) is in communication with the cavity of the injection mold.

4. The injection mold for manufacturing a display screen protection panel according to claim 1, characterized in that: The molten material guide channel (252) is in the form of a bull horn structure; the end with a larger channel opening of the molten material guide channel (252) is in communication with the molten material buffer chamber (251); the end with a smaller channel opening of the molten material guide channel (252) is a molten material injection port (252a); the molten material injection port (252a) faces and is adjacent to the edge position (221b), and is in communication with the front mold cavity position (221).

5. The injection mold for manufacturing a display screen protection panel according to claim 1, characterized in that: The edge position (221b) is provided with a limiting latch protrusion (221e).

6. The injection mold for manufacturing a display screen protection panel according to claim 2, characterized in that: A forming hole (241a) and a guide hole column (241b) pushed by the ejector pin (281) and inserted into the forming hole (241a) are provided at a position of the rear mold cavity (241) opposite to the edge position (221b).

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