Mobile phone lens barrel injection mold

Abstract

The invention discloses a mobile phone lens barrel injection mold, and relates to the field of injection molds, the mobile phone lens barrel injection mold comprises an upper mold base, a lower mold base, an upper mold core mounted on the upper mold base and a lower mold core mounted on the lower mold base, the upper mold core and the lower mold core form a plurality of mold cavities after being closed, and the upper mold core is provided with a main hot runner, a plurality of branch hot runners and a plurality of cold runners; the branch hot runners are communicated with one ends of the corresponding cold runners through corresponding hot runner nozzles, the other ends of the cold runners are communicated with the corresponding mold cavities, and valve needles are movably connected into the hot runner nozzles; the valve needle has a plugging state for plugging the corresponding hot runner nozzle to enable the branch hot runner to be disconnected from the corresponding cold runner and an opening state for enabling the branch hot runner to be communicated with the corresponding cold runner, a driver is mounted on the upper mold base or the upper mold core, and the driver is connected with the valve needle and used for controlling the valve needle to be switched between the plugging state and the opening state. According to the mobile phone lens barrel injection mold, high-precision and low-cost production of mobile phone lens barrels is achieved.

Description

Technical Field

[0001] The invention relates to the field of injection molds, in particular to an injection mold for a mobile phone lens barrel. Background Art

[0002] With the rapid development of 5G and IoT technologies, the importance of cameras in smart devices has become increasingly prominent, and their applications cover many fields such as e-commerce, mobile payments, administrative services, and unmanned driving. High-pixel and high-definition cameras have become the key direction of industry development, which places extremely high demands on the accuracy of mobile phone lens barrels. There are many problems with existing technologies when producing mobile phone lens barrels by multi-cavity injection molding. Traditional multi-cavity molds often adopt a double-row arrangement design. The runners have serious imbalance problems due to the front temperature difference, and the flow of multiple gates in each cavity is also unbalanced, making it difficult to ensure product quality. At the same time, the runner volume is large, resulting in a large amount of raw material waste and increasing the production cost of the enterprise. Under the short-cavity production mode, the molding cycle is too long and the production efficiency is low, which seriously weakens the competitiveness of enterprises in the market. Therefore, it is urgent to innovate the injection mold technology. Summary of the invention

[0003] In order to overcome the problems of unbalanced flow channels, poor production stability and waste of raw materials during multi-cavity injection molding in the prior art, the present invention provides a mobile phone lens barrel injection mold to achieve high-precision and low-cost production of mobile phone lens barrels.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A mobile phone lens barrel injection mold, comprising an upper mold base, a lower mold base, an upper mold core installed on the upper mold base and a lower mold core installed on the lower mold base, wherein the upper mold core and the lower mold core form multiple mold cavities after being molded together, the upper mold core is provided with a main hot runner, multiple branch hot runners and multiple cold runners, one end of each of the multiple branch hot runners is connected to the main hot runner, the other end of the branch hot runner is connected to one end of the corresponding cold runner through the corresponding hot runner nozzle, the other end of the cold runner is connected to the corresponding mold cavity, a valve needle is movably connected in the hot runner nozzle, and the valve needle has a blocked state for blocking the corresponding hot runner nozzle to disconnect the branch hot runner from the corresponding cold runner and an open state for connecting the branch hot runner to the corresponding cold runner, the upper mold base or the upper mold core is provided with a driver, the driver is connected to the valve needle and is used to control the valve needle to switch between the blocked state and the open state.

[0005] In the above technical solution, the branch hot runner set on the upper mold core can greatly shorten the length of the cold runner. The reduction in the length of the cold runner means that the material contained therein is reduced accordingly, thereby effectively saving raw materials and reducing production costs. And shortening the length of the cold runner can significantly optimize the glue feeding process, making the glue feeding more uniform and balanced. The balance of glue feeding helps to ensure the uniform distribution of the plastic melt in the mold cavity, so that the quality and dimensional accuracy of the mobile phone lens barrel after molding are more stable in various parts. The valve needle set in the hot runner nozzle can accurately control the connection between the hot runner nozzle and the corresponding cold runner by switching between the two states of blocking and opening. In the mold opening stage, switching the valve needle to the blocking state can effectively avoid the leakage of raw materials in the branch hot runner, prevent material waste, and also reduce the workload of cleaning the mold. During the injection molding process, the valve needle is opened, and the raw materials in the branch hot runner can directly flow into the corresponding cold runner and mold cavity, and the raw materials do not need to flow back into the branch hot runner, which saves time, speeds up the production cycle, and improves production efficiency. In addition, the valve needle is movably connected to the hot runner nozzle, and the valve needle is detachable from the upper mold core. Operators can quickly and easily replace valve needles of different outer diameters based on actual production conditions and product requirements. By replacing the valve needle, the size of the raw material flow channel between the branch hot runner and the valve needle can be adjusted, and the amount of raw material entering each cold runner can be precisely controlled. In this way, each mold cavity can receive the same amount and pressure of raw materials during the injection molding process, ensuring that the injection molding conditions of each mold cavity are consistent, effectively solving the dimensional accuracy and stability problems of the product, and helping to produce high-precision, high-quality mobile phone lens barrel products.

[0006] Preferably, the outlet of the hot runner nozzle is a tapered opening that is larger at the top and smaller at the bottom, and the end of the valve needle is provided with a tapered structure corresponding to the tapered opening.

[0007] In the above technical solution, when the valve needle is in the blocking state, the conical structure at the end of the valve needle can fit tightly with the conical opening of the hot runner nozzle outlet. This tight fit can not only achieve reliable blocking of the nozzle outlet, effectively prevent leakage of plastic melt during injection molding, but also provide a stable limit for the valve needle during blocking.

[0008] Preferably, the outer diameter of the valve needle is smaller than the inner diameter of the branch hot runner.

[0009] The above technical solution can form a raw material flow channel for the raw material to pass through between the branch hot runner and the valve needle.

[0010] Preferably, the cold runner is provided with two mold cavities correspondingly, and the two mold cavities are symmetrically arranged on both sides of the corresponding branch hot runner.

[0011] In the above technical solution, the two mold cavities are symmetrically distributed on both sides of the branch hot runner, and the principle of fluid mechanics can be used to achieve uniform diversion of the plastic melt from the branch hot runner to the mold cavities on both sides. This symmetrical layout can effectively ensure that the parameters such as injection pressure, temperature and filling time in the two mold cavities are basically consistent, so that the quality of the molded products is highly uniform, and the probability of defects in the products due to differences in injection molding conditions is significantly reduced. In terms of production efficiency, each cold runner corresponds to two mold cavities. Compared with the design of a single cold runner corresponding to a single mold cavity, it greatly increases the production quantity per unit time, reduces the production cycle, and achieves a significant improvement in production efficiency. Moreover, the symmetrically arranged mold cavities are conducive to the compact design of the mold structure. More cavities can be arranged in a limited mold space, further improving the production capacity of the mold and reducing the production cost of the unit product.

[0012] Preferably, the number of the branch hot runners is four, and the four branch hot runners are evenly distributed circumferentially with the main hot runner as the center.

[0013] In the above technical solution, this design fully considers the fluid distribution during the injection molding process and the balance of the mold structure. From the perspective of fluid dynamics, the four branch hot runners are evenly distributed circumferentially with the main hot runner as the center, which can make the plastic melt injected into the main hot runner from the injection molding machine be evenly diverted to the four branch hot runners. Since the length, diameter, and connection angle of each branch hot runner are the same and symmetrically distributed, the plastic melt is subjected to consistent resistance during the diversion process, thereby ensuring that each branch hot runner obtains an equal amount and equal pressure of plastic melt, thereby ensuring the uniformity of glue feeding in each cavity, effectively reducing product quality problems caused by unbalanced glue feeding, such as dimensional deviation, shrinkage marks, bubbles, etc., and greatly improving the product yield. From the perspective of mold structure layout, the circumferentially uniform design of the four branch hot runners makes the overall structure of the mold more compact, symmetrical and stable. On the one hand, this layout helps to install and position the mold on the injection molding machine, reduce vibration and wear caused by mold center of gravity offset or structural asymmetry, and extend the service life of the mold; on the other hand, the regular layout facilitates the processing, manufacturing and later maintenance of the mold, and technicians can more easily inspect, repair and replace various parts of the mold, reducing the maintenance cost of the mold and improving production efficiency. In addition, this design also facilitates the realization of auxiliary functions such as heating and temperature control of the hot runner system, making it easy to accurately control the temperature of the plastic melt in each hot runner to ensure the stability and consistency of the injection molding process.

[0014] Preferably, the driver is a linear driver, the valve needle is vertically slidably connected in the main hot runner, and the hot runner nozzle is arranged downward.

[0015] In the above technical solution, the linear drive can be a common linear drive such as a pneumatic cylinder or an electric cylinder. The vertically arranged valve needle moves more smoothly and stably under the dual effects of gravity and the linear drive, reducing the problems of jamming and uneven friction that may be caused by horizontal or inclined settings. At the same time, the hot runner nozzle is set downward, making it easier for the plastic melt to flow into the cold runner and mold cavity under the action of gravity, avoiding defects such as filling difficulties and cavitation caused by improper melt flow direction, and further improving the quality of injection molded products.

[0016] Preferably, the upper mold core is provided with a heating element for heating the materials in the main hot runner and the branch hot runner.

[0017] In the above technical solution, the heating element can be various commonly used heating elements such as heating coils. In the injection molding process, the temperature of the plastic melt has a significant impact on its fluidity, filling performance and molding quality of the final product. By arranging heating elements around the main hot runner and the branch hot runner, the plastic melt in the hot runner can be effectively maintained in the optimal operating temperature range. On the one hand, a stable and suitable temperature can ensure that the plastic melt always maintains good fluidity. This means that during the injection molding process, the plastic melt can more smoothly flow from the main hot runner through the branch hot runner and the hot runner nozzle, and finally fill each mold cavity quickly and evenly. Compared with the situation where no heating element is set or the heating effect is poor, the improved fluidity of the melt reduces the problems of insufficient filling and trapped air caused by excessive flow resistance, and effectively improves the yield rate of the product. For example, when producing some mobile phone lens barrels with complex structures and thin walls, good melt fluidity can ensure that the plastic melt smoothly fills the fine structure of the mold, so that the molded lens barrel is accurate in size and complete in appearance. On the other hand, the heating element helps to maintain the uniformity of the temperature in the hot runner. The main hot runner and branch hot runners have uniform temperatures throughout, which can avoid inconsistent melt viscosity caused by temperature differences. If there is a temperature gradient in the hot runner, the melt flow rates in different parts will be different, which will cause unbalanced plastic feeding in each cavity and affect the consistency of product quality. The stable temperature control function of the heating element can ensure that the plastic melt received by each cavity is basically the same in key parameters such as temperature and viscosity, thereby ensuring that the quality of the mobile phone lens barrel molded in each cavity is stable and the performance is consistent. In addition, stable temperature control can also reduce the cooling time of the plastic melt in the hot runner, improve injection efficiency, and reduce production costs.

[0018] Preferably, the lower die core is equipped with an insert, which includes an insert body and an insert seat arranged in sequence along the axial direction, the insert body and the insert seat are detachably connected, one end of the insert body axially passes through the lower die core, and the insert seat is installed on the lower die seat; and / or, the upper die core is equipped with an insert, which includes an insert body and an insert seat arranged in sequence along the axial direction, the insert body and the insert seat are detachably connected, one end of the insert body axially passes through the upper die core, and the insert seat is installed on the upper die seat.

[0019] In the above technical solution, in terms of processing and manufacturing, the originally integrated insert is divided into an insert body and an insert seat, so that the length of the insert body is shortened, which greatly reduces the processing difficulty. The shorter length makes it easier to control the influence of cutting force, clamping stress, etc. on processing accuracy during the processing, so that it is easy to ensure the processing accuracy. In terms of mold maintenance, since the insert seat and the insert body are detachable, the operator can flexibly select and replace the insert seat of appropriate length according to actual needs. This design greatly reduces the mold repair time. In traditional mold repair, it is often necessary to carry out complex disassembly and adjustment of the entire mold structure, which is time-consuming and labor-intensive. Under this design, only the independent component of the insert seat needs to be replaced to complete the repair or adjustment of the mold, which significantly improves the efficiency of mold maintenance. During the installation process, the design also shows great convenience. There is no need to disassemble the clamping fixture during installation. Just pass the non-molding end of the insert body through the fixture to accurately install the insert in place. This installation method cleverly avoids damage to the molding end during operation, effectively guarantees the quality of the insert, and further ensures that the mobile phone lens barrel produced by the mold has stable and high-quality performance, meeting the market's strict requirements for product precision and quality.

[0020] Preferably, the insert seat is provided with a radially extending mounting groove, and the insert body is provided with a mounting piece adapted to the mounting groove, and the mounting piece slides radially into the mounting groove and is installed in the mounting groove.

[0021] In the above technical solution, when installing the insert, the specific operation process is as follows: first, pass the insert body through the lower die core or the upper die core. In this process, the insert body is radially limited due to the structural limitation of the lower die core or the upper die core, so that the position of the insert body is preliminarily determined. Then move the insert seat in the radial direction so that the mounting part on the insert body can slide into the mounting groove of the insert seat along the radial direction and be accurately positioned and installed. This radial sliding installation method is not only easy to operate, but also ensures the tightness of the connection between the insert body and the insert seat. After the insert body and the insert seat are successfully connected, the last step is to fix the insert seat to the lower die seat or the upper die seat. Through this series of operations, the insert body can be reliably connected to the mold. On the one hand, this connection method ensures the stability of the insert in the mold and can withstand high temperature, high pressure and other working conditions during the injection molding process; on the other hand, the design of the radially extending mounting groove and the adapter mounting parts makes the installation and removal of the insert more convenient. When the insert is worn or needs to be replaced, the operation can be completed quickly, which improves the efficiency of mold maintenance and thus ensures the continuity and efficiency of the injection molding production of mobile phone lens barrels.

[0022] Preferably, a needle hole for installing an inlay needle is provided in the inlay body, one end of the needle hole faces the inlay seat, and the inlay seat blocks the end of the needle hole.

[0023] In the above technical solution, the plugging design of the insert seat for the end of the pin hole simplifies the installation process of the pin. When installing the pin, the operator only needs to align the pin with the pin hole. Due to the plugging effect of the insert seat, the pin will not accidentally fall out from the other end of the pin hole, so that the pin can be installed in place quickly and accurately, greatly improving the installation efficiency. In addition, this structural design that relies on the insert seat for plugging abandons the complicated fixing device or connection method, and only realizes the stable installation of the pin through the cooperation between the insert seat and the insert body. The overall structure is simple and clear, but it has a high degree of reliability. During the injection molding production process, even under the influence of complex working conditions such as high temperature and high pressure, the pin can be stably fixed in the pin hole, ensuring the normal operation of the mold and the production quality of the mobile phone lens barrel, and effectively reducing the probability of product defects and mold failures caused by loose or falling pins.

[0024] The beneficial effects of the present invention are as follows: (1) The length of the cold runner can be greatly shortened. The reduction in the length of the cold runner means that the material contained therein is reduced accordingly, thereby effectively saving raw materials and reducing production costs. In addition, shortening the length of the cold runner can significantly optimize the glue feeding process, making the glue feeding more uniform and balanced. The balance of glue feeding helps to ensure that the plastic melt in the mold cavity is evenly distributed, so that the quality and dimensional accuracy of the mobile phone lens barrel after molding are more stable in various parts. (2) The valve needle arranged in the hot runner nozzle can accurately control the connection between the hot runner nozzle and the corresponding cold runner by switching between the two states of blocking and opening. In the mold opening stage, switching the valve needle to the blocking state can effectively avoid the leakage of raw materials in the branch hot runner, prevent material waste, and also reduce the workload of cleaning the mold. In the injection molding process, the valve needle is opened, and the raw materials in the branch hot runner can directly flow into the corresponding cold runner and mold cavity, and the raw materials do not need to flow back into the branch hot runner, which not only saves time, but also speeds up the production cycle and improves production efficiency. (3) The valve needle is movably connected to the hot runner nozzle, and the valve needle and the upper mold core are detachable. Operators can quickly and easily replace valve needles of different outer diameters according to actual production conditions and product requirements. By replacing the valve needle, the size of the raw material flow channel between the branch hot runner and the valve needle can be adjusted, and the amount of raw material entering each cold runner can be precisely controlled. In this way, each mold cavity can receive the same amount and pressure of raw materials during the injection molding process, ensuring that the injection molding conditions of each mold cavity are consistent, effectively solving the dimensional accuracy and stability problems of the product, and helping to produce high-precision and high-quality mobile phone lens barrel products. (4) The originally integrated insert is divided into an insert body and an insert seat, which shortens the length of the insert body and greatly reduces the processing difficulty. The shorter length makes it easier to control the effects of cutting force, clamping stress, etc. on processing accuracy during the processing, making it easier to ensure processing accuracy. (5) In terms of mold maintenance, since the insert seat and the insert body are detachable, operators can flexibly select and replace the insert seat of appropriate length according to actual needs. This design greatly reduces the time for mold repair. Traditional mold repair often requires complex disassembly and adjustment of the entire mold structure, which is time-consuming and labor-intensive. Under this design, only the insert seat, an independent component, needs to be replaced to complete the repair or adjustment of the mold, which significantly improves the efficiency of mold maintenance. (6) During the installation process, this design also shows great convenience. There is no need to disassemble the clamping fixture during installation. The insert can be accurately installed in place by simply passing the non-molding end of the insert body through the fixture. This installation method cleverly avoids damage to the molding end during operation, effectively guarantees the quality of the insert, and thus ensures that the mobile phone lens barrel produced by the mold has stable and high-quality performance, meeting the market's strict requirements for product precision and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structure of the present invention is schematically shown in FIG. Figure 1 ; Figure 2 The structure of the present invention is schematically shown in FIG. Figure 2 ; Figure 3 yes Figure 1 A partial enlarged view of the middle A; Figure 4 yes Figure 2 A partial enlarged view of point B in the middle: Figure 5 It is a schematic diagram of the structure of the insert in the present invention; Figure 6 is a cross-sectional view of the insert in the invention; Figure 7 It is the waste material formed after the raw materials in the cold runner of the present invention are cooled.

[0026] In the figure: upper die base 1, lower die base 2, upper die core 3, lower die core 4, die cavity 5, main hot runner 6, branch hot runner 7, cold runner 8, hot runner nozzle 9, tapered port 9.1, valve needle 10, tapered structure 10.1, driver 11, insert 13, insert body 13.1, insert seat 13.2, mounting groove 13.3, mounting part 13.4, insert hole 13.5, insert 13.6 DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Embodiment 1: like Figures 1 to 7 As shown, a mobile phone lens barrel injection mold comprises an upper mold base 1, a lower mold base 2, an upper mold core 3 installed on the upper mold base 1 and a lower mold core 4 installed on the lower mold base 2. The upper mold core 3 and the lower mold core 4 are molded together to form a plurality of mold cavities 5. The upper mold core 3 is provided with a main hot runner 6, a plurality of branch hot runners 7 and a plurality of cold runners 8. One end of each of the plurality of branch hot runners 7 is connected to the main hot runner 6, and the other end of the branch hot runner 7 is connected to one end of the corresponding cold runner 8 through a corresponding hot runner nozzle 9. The other end of the cold runner 8 is connected to the corresponding mold cavity 5, and a valve needle 10 is movably connected in the hot runner nozzle 9, and the valve needle 10 has a blocked state for blocking the corresponding hot runner nozzle 9 to disconnect the branch hot runner 7 from the corresponding cold runner 8, and an open state for connecting the branch hot runner 7 to the corresponding cold runner 8. The upper mold base 1 or the upper mold core 3 is installed with a driver 11, and the driving end of the driver 11 is connected to the valve needle 10 and is used to control the valve needle 10 to switch between the blocked state and the open state.

[0029] In the above technical scheme, the branch hot runner 7 provided on the upper mold core 3 can greatly shorten the length of the cold runner 8. The reduction in the length of the cold runner 8 means that the material contained therein is reduced accordingly, thereby effectively saving raw materials and reducing production costs. And shortening the length of the cold runner 8 can significantly optimize the glue feeding process, making the glue feeding more uniform and balanced. The balance of glue feeding helps to ensure that the plastic melt in the mold cavity 5 is evenly distributed, so that the quality and dimensional accuracy of the mobile phone lens barrel after molding are more stable in various parts. The valve needle 10 provided in the hot runner nozzle 9 can accurately control the connection between the hot runner nozzle 9 and the corresponding cold runner 8 by switching between the two states of blocking and opening. In the mold opening stage, switching the valve needle 10 to the blocking state can effectively avoid the leakage of raw materials in the branch hot runner 7, prevent material waste, and also reduce the workload of cleaning the mold. In the injection molding process, the valve needle 10 is opened, and the raw materials in the branch hot runner 7 can directly flow into the corresponding cold runner 8 and the mold cavity 5, and the raw materials do not need to flow back into the branch hot runner 7, which saves time, speeds up the production cycle, and improves production efficiency. In addition, the valve needle 10 is movably connected to the hot runner nozzle 9, and the valve needle 10 is detachable from the upper mold core 3. The operator can quickly and easily replace the valve needles 10 of different outer diameters according to the actual production situation and product requirements. By replacing the valve needle 10, the size of the raw material flow channel between the branch hot runner 7 and the valve needle 10 can be adjusted, and then the amount of raw material entering each cold runner 8 can be precisely controlled. In this way, each mold cavity 5 can receive the same amount and pressure of raw materials during the injection molding process, ensuring that the injection molding conditions of each mold cavity 5 are consistent, effectively solving the dimensional accuracy and stability problems of the product, and helping to produce high-precision and high-quality mobile phone lens barrel products.

[0030] The one end and the other end described in the above technical solution do not refer to two ends far away from each other, but can be ends or any intermediate positions. When the valve needle 10 is in the open state, the end of the valve needle 10 is far away from the outlet of the hot runner nozzle 9. The driver 11 can be installed on the upper mold base 1 or the upper mold core 3 as needed.

[0031] Preferably, the outlet of the hot runner nozzle 9 is a tapered opening 9.1 that is larger at the top and smaller at the bottom, and the end of the valve needle 10 is provided with a tapered structure 10.1 corresponding to the tapered opening 9.1.

[0032] In the above technical solution, when the valve needle 10 is in the blocking state, the conical structure 10.1 at the end of the valve needle 10 can fit tightly with the conical opening 9.1 of the outlet of the hot runner nozzle 9. This tight fit can not only achieve reliable blocking of the nozzle outlet and effectively prevent leakage of the plastic melt during the injection molding process, but also provide a stable limit for the valve needle 10 during blocking.

[0033] Preferably, the outer diameter of the valve needle 10 is smaller than the inner diameter of the branch hot runner 7 .

[0034] The above technical solution can form a raw material flow channel for the raw materials to pass through between the branch hot runner 7 and the valve needle 10.

[0035] Preferably, the upper mold core 3 is provided with a heating element for heating the materials in the main hot runner 6 and the branch hot runner 7 .

[0036] In the above technical solution, the heating element can be various commonly used heating elements such as heating coils. In the injection molding process, the temperature of the plastic melt has a significant impact on its fluidity, filling performance and molding quality of the final product. By arranging heating elements around the main hot runner 6 and the branch hot runner 7, the plastic melt in the hot runner can be effectively maintained in the optimal operating temperature range. On the one hand, a stable and suitable temperature can ensure that the plastic melt always maintains good fluidity. This means that during the injection molding process, the plastic melt can more smoothly flow from the main hot runner 6 through the branch hot runner 7 and the hot runner nozzle 9, and finally quickly and evenly fill each mold cavity 5. Compared with the situation where no heating element is set or the heating effect is poor, the improved fluidity of the melt reduces the problems of insufficient filling and trapped air caused by excessive flow resistance, and effectively improves the yield rate of the product. For example, when producing some mobile phone lens barrels with complex structures and thin wall thickness, good melt fluidity can ensure that the plastic melt smoothly fills the fine structure of the mold, so that the molded lens barrel is accurate in size and complete in appearance. On the other hand, the heating element helps to maintain the uniformity of the temperature in the hot runner. The main hot runner 6 and the branch hot runner 7 have uniform temperatures throughout, which can avoid inconsistent melt viscosity caused by temperature differences. If there is a temperature gradient in the hot runner, the melt flow rates in different parts will be different, which will cause unbalanced glue feeding in each mold cavity 5, affecting the consistency of product quality. The stable temperature control function of the heating element can ensure that the plastic melt received by each mold cavity 5 is basically the same in key parameters such as temperature and viscosity, thereby ensuring that the quality of the mobile phone lens barrel molded in each mold cavity 5 is stable and the performance is consistent. In addition, stable temperature control can also reduce the cooling time of the plastic melt in the hot runner, improve injection molding efficiency, and reduce production costs.

[0037] Specifically, the driver 11 is a linear driver 11, the valve needle 10 is vertically slidably connected in the main hot runner 6, and the hot runner nozzle 9 is arranged downward. The linear driver 11 can be a commonly used linear driver 11 such as a cylinder or an electric cylinder. Under the dual effects of gravity and the linear driver 11, the vertically arranged valve needle 10 moves more smoothly and stably, reducing problems such as jamming and uneven friction that may be caused by horizontal or inclined settings. At the same time, the hot runner nozzle 9 is arranged downward, so that the plastic melt can flow into the cold runner 8 and the mold cavity 5 more easily under the action of gravity, avoiding defects such as filling difficulties and cavitation caused by improper melt flow direction, and further improving the quality of injection molded products.

[0038] It can be understood that, in another embodiment, the driver 11 is a linear driver 11 and can also be a driver 11 in the middle, which is used to drive the valve needle 10 to spirally rise and fall or swing.

[0039] In the injection molding production process, due to the limitation of the top rod hole position of the fixed panel of the injection molding machine, conventional molds have to be designed according to the parameters of the injection molding machine. This limitation makes the design and manufacture of the mold lack flexibility, and increases the cost of mold development and production. To solve this problem, this technical solution proposes to set an L-structure support at the bottom of the lower mold base. This innovative design can effectively break through the limitation of the top rod hole position of the fixed panel of the injection molding machine. By cleverly utilizing the special shape and position of the L-structure support, the mold is no longer completely restricted by the top rod hole parameters of the injection molding machine during installation and use.

[0040] The advantages of this design are significant, the most prominent of which is that it can reduce the cost of mold opening. In the past, in order to adapt to the parameters of the injection molding machine, the mold may need to undergo complex structural adjustments and customization, which undoubtedly increased the design, manufacturing and debugging costs of the mold. The application of the L-structure support allows the mold to be designed and manufactured to a certain extent independently of the ejector hole position restrictions of the injection molding machine, reducing the additional costs incurred by catering to the machine parameters. At the same time, this structure may also simplify the mold opening action, reduce energy consumption and mold wear during the mold opening process, further reduce the cost of mold use, and improve production efficiency.

[0041] Embodiment 2: like Figures 1 to 7 As shown, based on Example 1, the cold runner 8 is correspondingly provided with two cavities 5, and the two cavities 5 are symmetrically arranged on both sides of the corresponding branch hot runner 7. The number of the branch hot runners 7 is four, and the four branch hot runners 7 are evenly distributed circumferentially around the main hot runner 6.

[0042] In the above technical solution, the two mold cavities 5 are symmetrically distributed on both sides of the branch hot runner 7, and the principle of fluid mechanics can be used to achieve uniform diversion of the plastic melt from the branch hot runner 7 to the mold cavities 5 on both sides. This symmetrical layout can effectively ensure that the parameters such as the injection pressure, temperature and filling time in the two mold cavities 5 are basically consistent, so that the quality of the molded products is highly uniform, and the probability of defects in the products due to differences in injection molding conditions is significantly reduced. In terms of production efficiency, each cold runner 8 corresponds to two mold cavities 5. Compared with the design of a single cold runner 8 corresponding to a single mold cavity 5, the production quantity per unit time is greatly improved, the production cycle is reduced, and a significant improvement in production efficiency is achieved. Moreover, the symmetrically arranged mold cavities 5 are conducive to the compact design of the mold structure, and more cavities can be arranged in a limited mold space, further improving the production capacity of the mold and reducing the production cost of the unit product. The design of the four branch hot runners 7 uniformly distributed circumferentially with the main hot runner 6 as the center fully considers the fluid distribution during the injection molding process and the balance of the mold structure. From the perspective of fluid dynamics, the four branch hot runners 7 are evenly distributed circumferentially with the main hot runner 6 as the center, which can evenly divert the plastic melt injected from the injection molding machine into the main hot runner 6 to the four branch hot runners 7. Since the length, diameter, and connection angle of each branch hot runner 7 are the same and symmetrically distributed, the plastic melt is subjected to the same resistance during the diversion process, thereby ensuring that each branch hot runner 7 obtains the same amount and pressure of plastic melt, thereby ensuring the uniformity of the glue feeding of each mold cavity 5, effectively reducing product quality problems caused by unbalanced glue feeding, such as dimensional deviation, shrinkage marks, bubbles, etc., and greatly improving the product yield. From the perspective of mold structure layout, the circumferential uniform distribution design of the four branch hot runners 7 makes the overall structure of the mold more compact, symmetrical and stable. On the one hand, this layout helps to install and position the mold on the injection molding machine, reduce vibration, wear and other problems caused by mold center of gravity offset or structural asymmetry, and extend the service life of the mold; on the other hand, the regular layout facilitates the processing, manufacturing and subsequent maintenance of the mold, and technicians can more easily inspect, repair and replace various parts of the mold, reducing the maintenance cost of the mold and improving production efficiency. In addition, this design also facilitates the realization of auxiliary functions such as heating and temperature control of the hot runner system, making it easy to accurately control the temperature of the plastic melt in each hot runner 7 to ensure the stability and consistency of the injection molding process.

[0043] Embodiment 3: like Figures 1 to 7As shown, on the basis of Example 1, the lower mold core 4 is equipped with an insert 13, and the insert 13 includes an insert body 13.1 and an insert seat 13.2 arranged in sequence along the axial direction. The insert body 13.1 is detachably connected to the insert seat 13.2, one end of the insert body 13.1 axially passes through the lower mold core 4, and the insert seat 13.2 is installed on the lower mold seat 2. The insert seat 13.2 is provided with a radially extending mounting groove 13.3, and the insert body 13.1 is provided with a mounting piece 13.4 adapted to the mounting groove 13.3, and the mounting piece 13.4 slides into the mounting groove 13.3 along the radial direction and is installed in the mounting groove 13.3. The insert body 13.1 is provided with a needle hole 13.5 for installing an insert needle 13.6, one end of the needle hole 13.5 faces the insert seat 13.2, and the insert seat 13.2 blocks the end of the needle hole 13.5.

[0044] In the above technical solution, in terms of processing and manufacturing, the originally integrated insert 13 is divided into an insert body 13.1 and an insert seat 13.2, so that the length of the insert body 13.1 is shortened, which greatly reduces the processing difficulty. The shorter length makes it easier to control the influence of cutting force, clamping stress, etc. on the processing accuracy during the processing, so that it is easy to ensure the processing accuracy. In terms of mold maintenance, since the insert seat 13.2 and the insert body 13.1 are detachable, the operator can flexibly select and replace the insert seat 13.2 of the appropriate length according to actual needs. This design greatly reduces the mold repair time. When repairing the mold in the traditional way, it is often necessary to disassemble and adjust the entire mold structure in a complicated way, which is time-consuming and laborious. Under this design, only the independent component of the insert seat 13.2 needs to be replaced to complete the repair or adjustment of the mold, which significantly improves the efficiency of mold maintenance. During the installation process, the design also shows great convenience. There is no need to disassemble the clamping fixture during installation. Just pass the non-molding end of the insert body 13.1 through the fixture to accurately install the insert 13 in place. This installation method cleverly avoids damage to the molding end during operation, effectively guarantees the quality of the insert 13, and further ensures that the mobile phone lens barrel produced by the mold has stable and high-quality performance, meeting the market's strict requirements for product precision and quality.

[0045] When installing the insert 13, the specific operation process is as follows: first, the insert body 13.1 is passed through the lower mold core 4 or the upper mold core 3. In this process, the insert body 13.1 is radially limited due to the structural limitation of the lower mold core 4 or the upper mold core 3, so that the position of the insert body 13.1 is initially determined. Then the insert seat 13.2 is moved in the radial direction, so that the mounting piece 13.4 on the insert body 13.1 can slide into the mounting groove 13.3 of the insert seat 13.2 along the radial direction and be accurately positioned and installed. This radial sliding installation method is not only easy to operate, but also ensures the tightness of the connection between the insert body 13.1 and the insert seat 13.2. After the insert body 13.1 and the insert seat 13.2 are successfully connected, the last step is to fix the insert seat 13.2 with the lower mold seat 2 or the upper mold seat 1. Through this series of operations, the insert body 13.1 can be reliably connected to the mold. This connection method, on the one hand, ensures the stability of the insert 13 in the mold and can withstand high temperature, high pressure and other working conditions during the injection molding process; on the other hand, the design of the radially extending mounting groove 13.3 and the adapter mounting part 13.4 makes the installation and disassembly process of the insert 13 more convenient. When the insert 13 is worn or needs to be replaced, the operation can be completed quickly, which improves the efficiency of mold maintenance and thus ensures the continuity and efficiency of the injection molding production of mobile phone lens barrels.

[0046] The plugging design of the insert seat 13.2 on the end of the pin hole 13.5 simplifies the installation process of the insert pin 13.6. When installing the insert pin 13.6, the operator only needs to align the insert pin 13.6 with the pin hole 13.5. Due to the plugging effect of the insert seat 13.2, the insert pin 13.6 will not accidentally fall out from the other end of the pin hole 13.5, so that the insert pin 13.6 can be quickly and accurately installed in place, greatly improving the installation efficiency. In addition, this structural design that relies on the insert seat 13.2 for plugging abandons complex fixing devices or connection methods, and only realizes the stable installation of the insert pin 13.6 through the cooperation between the insert seat 13.2 and the insert body 13.1. The overall structure is simple and clear, but has a high degree of reliability. During the injection molding production process, even under the influence of complex working conditions such as high temperature and high pressure, the insert pin 13.6 can be stably fixed in the insert pin hole 13.5, ensuring the normal operation of the mold and the production quality of the mobile phone lens barrel, and effectively reducing the probability of product defects and mold failures caused by loosening or falling off of the insert pin 13.6.

[0047] It can be understood that in another embodiment, the upper mold core 3 is installed with an insert 13, and the insert 13 includes an insert body 13.1 and an insert seat 13.2 arranged in sequence along the axial direction, the insert body 13.1 and the insert seat 13.2 are detachably connected, one end of the insert body 13.1 axially passes through the upper mold core 3, and the insert seat 13.2 is installed on the upper mold base 1.

Claims

1. A mobile phone lens barrel injection mold, comprising an upper mold base, a lower mold base, an upper mold core installed on the upper mold base and a lower mold core installed on the lower mold base, wherein the upper mold core and the lower mold core are molded together to form a plurality of mold cavities, wherein: The upper mold core is provided with a main hot runner, multiple branch hot runners and multiple cold runners, one ends of the multiple branch hot runners are connected to the main hot runner, the other ends of the branch hot runners are connected to one end of the corresponding cold runner through the corresponding hot runner nozzles, the other end of the cold runner is connected to the corresponding mold cavity, a valve needle is movably connected in the hot runner nozzle, and the valve needle has a blocked state for blocking the corresponding hot runner nozzle to disconnect the branch hot runner from the corresponding cold runner and an open state for connecting the branch hot runner to the corresponding cold runner, and a driver is installed on the upper mold base or the upper mold core, the driver is connected to the valve needle and is used to control the valve needle to switch between the blocked state and the open state.

2. The mobile phone lens barrel injection mold according to claim 1, characterized in that: The outlet of the hot runner nozzle is a tapered opening that is larger at the top and smaller at the bottom, and the end of the valve needle is provided with a tapered structure corresponding to the tapered opening.

3. The mobile phone lens barrel injection mold according to claim 1, characterized in that: The outer diameter of the valve needle is smaller than the inner diameter of the branch hot runner.

4. The mobile phone lens barrel injection mold according to claim 1, characterized in that: The cold runner is correspondingly provided with two mold cavities, and the two mold cavities are symmetrically arranged on both sides of the corresponding branch hot runner.

5. The mobile phone lens barrel injection mold according to claim 1, characterized in that: The number of the branch hot runners is four, and the four branch hot runners are evenly distributed circumferentially with the main hot runner as the center.

6. A mobile phone lens barrel injection mold according to any one of claims 1 to 5, characterized in that: The driver is a linear driver, the valve needle is vertically slidably connected in the main hot runner, and the hot runner nozzle is arranged downward.

7. A mobile phone lens barrel injection mold according to any one of claims 1 to 5, characterized in that: The upper mold core is provided with a heating element for heating the materials in the main hot runner and the branch hot runner.

8. The mobile phone lens barrel injection mold according to any one of claims 1 to 5, characterized in that: The lower die core is equipped with an insert, which includes an insert body and an insert seat arranged in sequence along the axial direction, the insert body and the insert seat are detachably connected, one end of the insert body axially passes through the lower die core, and the insert seat is installed on the lower die seat; and / or, the upper die core is equipped with an insert, which includes an insert body and an insert seat arranged in sequence along the axial direction, the insert body and the insert seat are detachably connected, one end of the insert body axially passes through the upper die core, and the insert seat is installed on the upper die seat.

9. The mobile phone lens barrel injection mold according to claim 8, characterized in that: The insert seat is provided with a radially extending mounting groove, the insert body is provided with a mounting piece adapted to the mounting groove, and the mounting piece slides into the mounting groove in the radial direction and is mounted in the mounting groove.

10. The mobile phone lens barrel injection mold according to claim 8, characterized in that: The insert body is provided with a needle hole for installing the insert needle, one end of the needle hole faces the insert seat, and the insert seat blocks the end of the needle hole.

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