Liquid silicone mold structure of nozzle

Abstract

This utility model relates to the technical field of headphone processing equipment and relates to a nozzle liquid silicone mold structure. It includes a mold component comprising an upper mold and a lower mold, detachably connected by a movable insert. The movable insert has multiple assembly parts. The bottom of the upper mold has multiple first fixed cavities, each with a first cavity at its front end. The top of the lower mold has multiple second fixed cavities, each with a recessed second cavity at its front end. By providing multiple assembly parts on the movable insert for assembling nozzles, multiple nozzles can be simultaneously molded in a single injection molding process, reducing the number of mold opening and closing operations, loading and unloading, and shortening the production cycle, thus significantly improving production efficiency. Furthermore, since multiple nozzles are positioned and placed as a whole through the movable insert, the difficulty and error of operations inside the mold are reduced, improving the mold's service life and production stability.

Description

Technical Field

[0001] This utility model relates to the technical field of headphone processing equipment, specifically to a nozzle liquid silicone mold structure. Background Technology

[0002] With the rapid development of technology, headphones, as an important audio device, have been widely used in people's daily lives. From traditional wired headphones to today's popular wireless Bluetooth headphones, consumers have increasingly higher requirements for the sound quality, comfort, and durability of headphones. In order to meet these needs, headphone design and manufacturing processes are constantly being innovated and improved.

[0003] Currently, in the liquid silicone molding process for headphone nozzles, the industry commonly uses a mold structure with a single headphone nozzle. The working principle of this mold structure is to place a single headphone nozzle into the mold and then perform liquid silicone injection molding to create a liquid silicone nozzle cap that matches the nozzle.

[0004] The liquid silicone molding method of placing the nozzle cap into the mold one by one means that only one earphone nozzle cap can be produced at a time. In the case of mass production, this production method requires frequent mold opening and closing, loading and unloading, etc., resulting in a long production cycle and low production efficiency.

[0005] Because liquid silicone is used to mold only a single earphone nozzle at a time, the mold is prone to wear and deformation during frequent opening and closing over a long period. Moreover, when placing a single earphone nozzle, the operator needs to accurately position it in the designated location on the mold. Improper placement may cause the mold to be crushed during the mold closing process, damaging both the mold and the product. Once the mold is damaged by crushing, it will not only require a lot of time and cost for repair, but also cause production to stop and affect the product delivery cycle. In addition, the pressure distribution of the mold structure for individual molding may be uneven during the liquid silicone injection process, which will also increase the risk of crushing and further reduce the stability and reliability of production.

[0006] This utility model was proposed in response to the shortcomings of the existing technology. Utility Model Content

[0007] The aforementioned technical problem addresses the shortcomings of existing liquid silicone mold structures for headphone nozzles, which typically employ a single headphone nozzle design and place it individually into the mold for liquid silicone molding of the nozzle cap. This design results in low efficiency and high mold compression risks.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A nozzle liquid silicone mold structure includes a mold component comprising an upper mold and a lower mold, which are detachably connected by a movable insert. The movable insert has multiple mounting parts for assembling nozzles. The bottom of the upper mold has multiple first fixing cavities for accommodating the nozzles, and the front end of each first fixing cavity has a recessed first cavity. The top of the lower mold has multiple second fixing cavities corresponding to the first fixing cavities, and the front end of each second fixing cavity has a recessed second cavity. When the upper and lower molds are closed, the first and second fixing cavities enclose a fixing chamber for positioning and fixing the nozzles. The first and second cavities enclose an injection chamber for injection molding a nozzle cap for the nozzle tip. The mold component has an injection channel communicating with the injection chamber.

[0010] As described above, in the nozzle liquid silicone mold structure, the assembly part includes an assembly hole that can be inserted into the corresponding nozzle rear end.

[0011] As described above, in the nozzle liquid silicone mold structure, a first positioning component is provided between the upper mold and the movable insert. The first positioning component includes a first positioning groove at the bottom of the upper mold, and the movable insert can be assembled into the first positioning groove.

[0012] As described above, in the nozzle liquid silicone mold structure, the first positioning component further includes a positioning post disposed on the top of the movable insert and a positioning hole disposed on the upper mold. The positioning hole is located above the first positioning groove and the two are connected. The positioning post can be inserted into the positioning hole.

[0013] As described above, in the nozzle liquid silicone mold structure, a second positioning component is provided between the lower mold and the movable insert. The second positioning component includes a second positioning groove located on the top of the lower mold, and the movable insert can be assembled into the second positioning groove.

[0014] As described above, in the nozzle liquid silicone mold structure, the second positioning component further includes a third positioning groove disposed in the lower mold and a positioning block disposed at the bottom of the movable insert. The third positioning groove is located below the second positioning groove and the two are connected. The positioning block can be inserted into the third positioning groove.

[0015] The nozzle liquid silicone mold structure described above further includes a pin support assembly located at the rear end of the mold component. The pin support assembly includes a first driving device, a pin mounting block located at the output end of the first driving device, and a plurality of pins located on the pin mounting block. The mounting hole is a through hole, and each pin can be inserted into the nozzle through the corresponding mounting hole to support the nozzle.

[0016] The nozzle liquid silicone mold structure described above further includes a nozzle sealing assembly located at the front end of the mold component. The nozzle sealing assembly includes a second driving device, a top pressure block located at the output end of the second driving device, and a plurality of top pressure columns located on the top pressure block. Each injection chamber has a top pressure hole at its front end. The front end of the top pressure column can pass through the top pressure hole and abut against the front end of the nozzle, and the top pressure column can abut against the top pressure hole to keep the injection chamber in a relatively sealed state.

[0017] As described above, in the nozzle liquid silicone mold structure, the front end of the top pressure column is further provided with a first injection groove communicating with the injection chamber. The first injection groove is further provided with a top pressure protrusion and an injection protrusion. The top pressure protrusion is concentrically arranged with the first injection groove, and the top pressure protrusion can abut against the front end of the nozzle. The two ends of the injection protrusion are respectively connected to the inner wall of the top pressure protrusion and the first injection groove.

[0018] As described above, in the nozzle liquid silicone mold structure, the front end of the top pressing protrusion is also provided with a sealing protrusion, which can be inserted into the nozzle through the through hole at the front end of the nozzle.

[0019] The beneficial effects of this utility model are as follows:

[0020] This utility model relates to the technical field of headphone processing equipment and relates to a nozzle liquid silicone mold structure. It includes a mold component comprising an upper mold and a lower mold, detachably connected by a movable insert. The movable insert has multiple assembly parts. The bottom of the upper mold has multiple first fixed cavities, each with a first cavity at its front end. The top of the lower mold has multiple second fixed cavities, each with a recessed second cavity at its front end. By providing multiple assembly parts on the movable insert for assembling nozzles, multiple nozzles can be simultaneously molded in a single injection molding process, reducing the number of mold opening and closing operations, loading and unloading, and shortening the production cycle, thus significantly improving production efficiency. Furthermore, since multiple nozzles are positioned and placed as a whole through the movable insert, the difficulty and error of operations inside the mold are reduced, improving the mold's service life and production stability.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is one of the structural schematic diagrams of the nozzle liquid silicone mold structure of this utility model (with a nozzle assembled and in the mold closed state).

[0023] Figure 2 This is one of the exploded schematic diagrams and a partially enlarged schematic diagram (with nozzle assembled) of the nozzle liquid silicone mold structure of this utility model.

[0024] Figure 3 This is the second exploded schematic diagram of the nozzle liquid silicone mold structure of this utility model (with nozzle assembled).

[0025] Figure 4 A schematic diagram of the structure of the movable insert of this utility model equipped with a nozzle;

[0026] Figure 5 This is a schematic diagram of the upper mold of this utility model;

[0027] Figure 6 This is a schematic diagram of the top pressure column of this utility model;

[0028] Figure 7 This is a partially enlarged cross-sectional view of the nozzle liquid silicone mold structure of this utility model (with the nozzle assembled and in the mold closed state).

[0029] Figure 8 This is a schematic diagram of the structure of the nozzle after the nozzle cap is formed according to the present invention. Detailed Implementation

[0030] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0031] like Figures 1 to 8 As shown, the nozzle liquid silicone mold structure of this embodiment includes a mold component, which includes an upper mold 1 and a lower mold 2, and a movable insert 3 is detachably connected between them. The movable insert 3 is provided with a plurality of assembly parts 31 that can assemble nozzles 4. The bottom of the upper mold 1 is provided with a plurality of first fixing cavities 11 that can accommodate the nozzles 4. The front end of each first fixing cavity 11 is provided with a recessed first cavity 12. The top of the lower mold 2 is provided with a plurality of second fixing cavities 21 corresponding to the first fixing cavities 11. The front end of each second fixing cavity 21 is provided with a recessed second cavity 22. When the upper mold 1 and the lower mold 2 are closed, the first fixing cavities 11 and the second fixing cavities 21 surround to form a fixing chamber for positioning and fixing the nozzles 4. The first cavity 12 and the second cavity 22 surround to form an injection chamber for injection molding into a nozzle cap 41 at the front end of the nozzles 4. The mold component is provided with an injection channel communicating with the injection chamber.

[0032] Specifically, the movable insert 3 is installed between the upper mold 1 and the lower mold 2 of the mold component to achieve a detachable connection between the three. Multiple nozzles 4 are respectively assembled into the various assembly parts 31 of the movable insert 3 to complete the initial positioning of the nozzles 4.

[0033] During the mold closing process, the first fixed cavity 11 at the bottom of the upper mold 1 corresponds to and surrounds the second fixed cavity 21 at the top of the lower mold 2, positioning and fixing the nozzle 4 located on the assembly part 31 of the movable insert 3 in the formed fixed cavity. At the same time, the first cavity 12 and the second cavity 22 also surround to form an injection cavity for injection molding the nozzle cap 41.

[0034] Liquid silicone is injected into the injection cavity through the injection channel on the mold component that communicates with the injection cavity. The liquid silicone flows and fills the injection cavity, and gradually forms the nozzle cap 41 at the front end of the nozzle 4 according to the shape of the injection cavity.

[0035] After the liquid silicone cools and solidifies, the upper mold 1 moves upward and separates from the lower mold 2 to open the mold. Then, the movable insert 3 is removed from the mold components, and the nozzle 4 with the nozzle cap 41 is taken out.

[0036] The movable insert 3 is equipped with multiple assembly parts 31 that can assemble nozzles 4. In a single injection molding process, multiple nozzles 4 can be molded with nozzle caps 41 at the same time, which greatly reduces the number of operations such as mold opening and closing, loading and unloading, shortens the production cycle, increases the product output per unit time, and thus significantly improves production efficiency.

[0037] Since multiple nozzles 4 are positioned and placed as a whole through the movable insert 3, the molding problem caused by improper placement when placing individual nozzles is avoided. The movable insert 3 can accurately assemble multiple nozzles 4 in advance outside the mold and then install them into the mold as a whole, which reduces the difficulty and error of operation inside the mold, reduces the possibility of molding, and improves the service life of the mold and the stability of production.

[0038] Multiple nozzles 4 are injection molded simultaneously in the same mold environment. The molding conditions (such as temperature, pressure, liquid silicone flow rate, etc.) of each nozzle cap 41 are basically the same, which helps to ensure the consistency of the dimensional accuracy, shape and performance of each nozzle cap 41, thereby improving the overall quality of the product.

[0039] The movable insert 3 is detachably connected to the upper mold 1 and the lower mold 2. When the movable insert 3 is worn or damaged, it can be easily disassembled and replaced without repairing or replacing the entire mold, thus reducing mold maintenance costs and downtime.

[0040] like Figures 1 to 8 As shown, the assembly part 31 in this embodiment includes an assembly hole that can be inserted into the rear end of the corresponding nozzle 4.

[0041] Specifically, before injection molding, the operator aligns the rear end of the nozzle 4 with the mounting hole of the mounting part 31 on the movable insert 3, and then inserts the nozzle 4 into the mounting hole. Since the size of the mounting hole and the rear end of the nozzle 4 are compatible, the two are tightly connected through interference fit, clearance fit or other suitable fit methods, thereby fixing the nozzle 4 on the movable insert 3.

[0042] The movable insert 3 with nozzle 4 is installed between the upper mold 1 and the lower mold 2 of the mold and the mold is closed. At this time, the nozzle 4 fixed on the movable insert 3 is accurately positioned in the fixed cavity formed by the first fixed cavity 11 and the second fixed cavity 21. Then, liquid silicone is injected into the injection cavity formed by the first cavity 12 and the second cavity 22 through the injection channel. The liquid silicone is formed into a nozzle cap 41 in the injection cavity and is combined with the front end of the nozzle 4.

[0043] After the mold is opened, the movable insert 3 is removed from the mold. Due to the insertion relationship between the rear end of the nozzle 4 and the assembly hole, the operator can easily pull the formed nozzle 4 with the nozzle cap 41 out of the assembly hole of the movable insert 3.

[0044] The assembly hole is inserted into the rear end of the nozzle 4, which can provide precise positioning of the nozzle 4 in the mold. During the mold closing process, the nozzle 4 can be accurately positioned in the fixed cavity formed by the first fixed cavity 11 and the second fixed cavity 21, as well as in the injection cavity formed by the first cavity 12 and the second cavity 22. This ensures that the liquid silicone can be accurately formed into the nozzle cap 41 at the front end of the nozzle 4, guaranteeing the connection accuracy and positional accuracy between the nozzle cap 41 and the nozzle 4, and improving the quality of the product.

[0045] By fitting the assembly hole into the rear end of the nozzle 4, the nozzle 4 can be stably fixed during the injection molding process. When liquid silicone is injected into the injection molding chamber, a certain pressure will be generated. This fitting method can prevent the nozzle 4 from shifting or shaking under pressure, thereby ensuring the molding quality of the nozzle cap 41 and avoiding product defects caused by changes in the position of the nozzle 4, such as loose connection between the nozzle cap 41 and the nozzle 4, dimensional deviations, etc.

[0046] Inserting the rear end of nozzle 4 into the assembly hole is a relatively simple operation that is easy for operators to master. The plug-in method allows for the quick installation and removal of nozzle 4, improving the efficiency of loading and unloading materials during the production process and further enhancing overall production efficiency.

[0047] like Figures 1 to 8 As shown, in this embodiment, a first positioning component is provided between the upper mold 1 and the movable insert 3. The first positioning component includes a first positioning groove 13 located at the bottom of the upper mold 1, and the movable insert 3 can be assembled into the first positioning groove 13.

[0048] Specifically, under the constraint of the first positioning groove 13, the movable insert 3 maintains its relative position with the upper mold 1, thereby ensuring that the nozzle 4 and other components installed on the movable insert 3 can accurately cooperate with the corresponding structure on the lower mold 2 to form a complete injection cavity and a fixed cavity.

[0049] The first positioning groove 13 provides precise positioning for the movable insert 3, enabling the movable insert 3 to be accurately installed on the upper mold 1.

[0050] Assembling the movable insert 3 into the first positioning groove 13 can enhance the stability of the movable insert 3 on the upper mold 1. During the mold closing and injection molding process, the mold will be subjected to greater pressure and vibration. The first positioning groove 13 can limit the displacement and shaking of the movable insert 3, prevent the movable insert 3 from shifting or loosening on the upper mold 1, thereby ensuring the stability of the injection molding process and the consistency of product quality.

[0051] like Figures 1 to 8 As shown, the first positioning component in this embodiment also includes a positioning post 32 disposed on the top of the movable insert 3 and a positioning hole 14 disposed on the upper mold 1. The positioning hole 14 is located above the first positioning groove 13 and the two are connected. The positioning post 32 can be inserted into the positioning hole 14.

[0052] Specifically, since the positioning hole 14 is located above the first positioning groove 13 and the two are connected, the positioning pin 32 will naturally align with the positioning hole 14 and be inserted into the positioning hole 14 when the movable insert 3 is fully inserted into the first positioning groove 13.

[0053] When the mold is closed, the upper mold 1 moves downward and closes with the lower mold. The movable insert 3 cooperates with the positioning pin 32 and the positioning hole 14. During the injection process, high pressure is generated inside the mold. The tight cooperation between the positioning pin 32 and the positioning hole 14 can withstand and disperse these pressures, ensuring that the position of the movable insert 3 on the upper mold 1 will not shift due to pressure.

[0054] The first positioning groove 13 provides initial positioning for the movable insert 3, while the cooperation between the positioning pin 32 and the positioning hole 14 provides more precise positioning in the horizontal direction. After the positioning pin 32 is inserted into the positioning hole 14, it can restrict the rotation and displacement of the movable insert 3 on the horizontal plane, ensuring that the nozzle 4 and other components on the movable insert 3 can be precisely aligned with the corresponding structure on the lower mold 2, thereby improving the dimensional accuracy and quality of the injection molded product.

[0055] During the injection molding process, the movable insert 3 is subjected to injection pressure. The cooperation between the positioning pin 32 and the positioning hole 14 can evenly transmit these pressures to the upper mold 1, avoiding excessive local stress on the movable insert 3 and causing damage. At the same time, the even force distribution also helps to extend the service life of the mold.

[0056] like Figures 1 to 8 As shown, in this embodiment, a second positioning component is provided between the lower mold 2 and the movable insert 3. The second positioning component includes a second positioning groove 23 located on the top of the lower mold 2, and the movable insert 3 can be assembled into the second positioning groove 23.

[0057] Specifically, the operator will roughly align the movable insert 3 with the second positioning groove 23 on the top of the lower mold 2 so that the movable insert 3 enters the second positioning groove 23. The shape of the second positioning groove 23 is adapted to the shape of the bottom of the movable insert 3. During the process of the movable insert 3 entering, the side wall of the second positioning groove 23 will guide the movable insert 3 so that it accurately reaches the predetermined position.

[0058] After the mold is closed, injection molding is performed. During the injection molding process, a certain pressure will be generated inside the mold. The second positioning groove 23 plays a limiting role on the movable insert 3, preventing the movable insert 3 from being displaced or shaking under the action of injection pressure, ensuring the relative position between the movable insert 3 and the lower mold 2 is stable, and ensuring the smooth progress of the injection molding process.

[0059] The second positioning groove 23 provides a precise positioning reference for the movable insert 3. After the movable insert 3 is assembled into the second positioning groove 23, it can be accurately positioned in the horizontal direction, ensuring that the relevant parts on the movable insert 3 (such as the nozzle 4) are precisely aligned with the corresponding structure on the lower mold 2. This helps to improve the dimensional accuracy and shape accuracy of the injection molded product and reduce the product defect rate.

[0060] During the injection molding process, the mold is subjected to significant pressure and impact. The second positioning component enhances the connection stability between the movable insert 3 and the lower mold 2. The limiting effect of the second positioning groove 23 on the movable insert 3 can effectively resist external forces, prevent the movable insert 3 from shifting or shaking during the injection molding process, ensure the overall stability of the mold, and extend the service life of the mold.

[0061] like Figures 1 to 8 As shown, the second positioning component in this embodiment also includes a third positioning groove 24 disposed on the lower mold 2 and a positioning block 33 disposed on the bottom of the movable insert 3. The third positioning groove 24 is located below the second positioning groove 23 and the two are connected. The positioning block 33 can be inserted into the third positioning groove 24.

[0062] Specifically, since the third positioning groove is located below the second positioning groove and the two are connected, the positioning block will first align with the opening of the third positioning groove. As the movable insert descends, the positioning block is gradually inserted into the third positioning groove. During the insertion process, the inner wall of the third positioning groove will guide the positioning block to ensure that the positioning block accurately enters the predetermined position. At the same time, the movable insert will also be accurately assembled into the second positioning groove to achieve precise cooperation between the movable insert and the lower mold.

[0063] During the injection molding stage, significant pressure is generated inside the mold. After the locating block is inserted into the third locating groove, a tight fit is formed between the two. The constraint effect of the third locating groove on the locating block can effectively resist the horizontal and vertical components of the injection pressure, preventing the movable insert from shifting or wobbling under the injection pressure, ensuring the relative position stability between the movable insert and the lower mold, and allowing the injection molding process to proceed smoothly.

[0064] The second positioning groove and the movable insert provide initial positioning, while the positioning block and the third positioning groove further refine and refine the positioning between the movable insert and the lower mold. After the positioning block is inserted into the third positioning groove, it plays a more precise positioning role for the movable insert in both the horizontal and vertical directions, which can better ensure that the components on the movable insert (such as nozzles) are precisely aligned with the corresponding structures on the lower mold, thereby improving the dimensional and shape accuracy of the injection molded products and reducing product errors and defect rates.

[0065] During the injection molding process, the mold is subjected to various forces, such as injection pressure and mechanical vibration. The cooperation between the positioning block and the third positioning groove increases the connection stability between the movable insert and the lower mold. The constraint of the positioning block in the third positioning groove can effectively resist external forces and prevent the movable insert from undergoing slight displacement or shaking during the injection molding process. This ensures that the mold can maintain a stable working state even under high pressure, which is beneficial to improving the quality and consistency of injection molded products.

[0066] The positioning block and the third positioning groove make the force between the movable insert and the lower mold more even. Under the action of injection pressure, the positioning block and the third positioning groove can share some of the pressure, avoid excessive stress in local areas of the movable insert and the lower mold, reduce mold wear and damage, and extend the service life of the mold.

[0067] During the installation and debugging of the mold, the design of the positioning block and the third positioning groove provides clear positioning marks. Operators can quickly determine whether the installation position of the movable insert is correct by observing the fit between the positioning block and the third positioning groove, without the need for complicated measurement and adjustment work, which improves the installation and debugging efficiency of the mold and shortens the production preparation time.

[0068] like Figures 1 to 8 As shown, the mold structure of this embodiment also includes a pin support assembly 5 located at the rear end of the mold component. The pin support assembly 5 includes a first driving device 51, a pin mounting block 52 located at the output end of the first driving device 51, and a plurality of pins 53 located on the pin mounting block 52. The mounting hole is a through hole, and each pin 53 can be inserted into the nozzle 4 through the corresponding mounting hole to support the nozzle 4.

[0069] Specifically, before the injection molding operation, the insert support assembly is in its initial state, the first drive device (usually a cylinder, hydraulic cylinder, or electric push rod) is in its retracted state, the insert mounting block is located away from the rear end of the mold components, and the insert is not inserted into the nozzle. At this time, the operator can perform mold installation, debugging, and inspection of related components.

[0070] When the mold is ready for injection molding, the control system issues a command, and the first drive device starts working. The output end of the first drive device extends forward, driving the insert mounting block to move towards the rear end of the mold component. Since the insert mounting block is equipped with multiple inserts and the assembly holes are through holes, each insert will accurately insert into the nozzle through the corresponding assembly hole as the insert mounting block moves. After the insert is inserted into the nozzle, it provides additional support for the nozzle and enhances the stability of the nozzle during the injection molding process.

[0071] During the injection molding process, the high-temperature and high-pressure plastic melt is injected into the mold cavity through the nozzle. At this time, the insert pins inside the nozzle play a supporting role, resisting the pressure and impact of the plastic melt on the nozzle, preventing the nozzle from deforming or shifting due to excessive force, ensuring that the plastic melt can be injected into the mold cavity stably and accurately, and ensuring the smooth progress of the injection molding process.

[0072] After injection molding is completed, the first drive unit receives a command from the control system, and the output end begins to retract, driving the insert mounting block to move backward. The insert is pulled out of the nozzle as the insert mounting block moves, returning to the initial state and preparing for the next injection molding operation.

[0073] During injection molding, the nozzle needs to withstand the impact of high-temperature and high-pressure molten plastic. Without additional support, it is prone to deformation or displacement, resulting in unstable flow direction and flow rate of the molten plastic, which affects the quality of the injection molded product. After the insert pin is inserted into the nozzle to provide support, it can effectively enhance the structural strength and stability between the nozzle and the nozzle cap, so that the nozzle maintains the accurate position and shape during the injection molding process of the nozzle cap. This ensures that the molten plastic can be injected into the mold cavity evenly and stably, thereby improving the dimensional accuracy and surface quality of the injection molded product.

[0074] Due to the supporting effect of the insert, the stress on the nozzle during injection molding is dispersed and relieved, reducing the wear and damage caused by the nozzle being subjected to high pressure for a long time. This helps to extend the service life of the nozzle, reduce the maintenance cost of the mold and the frequency of replacement of parts, and improve production efficiency.

[0075] like Figures 1 to 8As shown, the mold structure of this embodiment also includes a nozzle sealing assembly 6 disposed at the front end of the mold component. The nozzle sealing assembly 6 includes a second driving device 61, a top pressure block 62 disposed at the output end of the second driving device 61, and a plurality of top pressure columns 63 disposed at the top pressure block 62. Each injection molding chamber has a top pressure hole 7 at its front end. The front end of the top pressure column 63 can pass through the top pressure hole 7 and abut against the front end of the nozzle 4, and the top pressure column 63 can abut against the top pressure hole 7 so that the injection molding chamber is in a relatively sealed state.

[0076] Before the injection molding operation begins, the nozzle sealing assembly is in its initial state, the second drive device (usually a cylinder, hydraulic cylinder, or electric push rod, etc.) is in its retracted state, the top pressure block is located away from the front end of the mold components, and the top pressure column, top pressure hole, and nozzle front end are all in a separated state. At this time, the mold can be installed, adjusted, and related components can be inspected.

[0077] When the mold is ready for injection molding, the control system issues a command, and the second drive unit starts working. The output end of the second drive unit extends forward, driving the ejector block to move towards the front end of the mold component. As the ejector block moves, multiple ejector pins on the ejector block gradually approach the ejector hole and the nozzle front end. When the ejector pins move to the appropriate position, the front end of the ejector pin passes through the ejector hole and abuts against the nozzle front end. At the same time, the side of the ejector pin fits tightly against the ejector hole. This design creates a relatively sealed space in the injection chamber, preventing the plastic melt from leaking from the front end of the injection chamber during the injection molding process.

[0078] In a sealed state, the high-temperature and high-pressure plastic melt is injected into the injection chamber through the nozzle. Since the injection chamber is in a relatively sealed state, the plastic melt can only flow inside the injection chamber and fill the mold cavity, preventing the plastic melt from leaking to the outside of the mold and ensuring the smooth progress of the nozzle cap injection process.

[0079] After injection molding is completed, the second drive device receives the instruction from the control system, and the output end begins to retract, driving the top pressure block to move backward. The top pressure column exits from the top pressure hole as the top pressure block moves, separating from the nozzle front end, releasing the sealing state of the injection molding chamber, so as to carry out subsequent mold opening, part removal and other operations.

[0080] During injection molding, the high-temperature, high-pressure molten plastic has strong fluidity. If the injection chamber is not properly sealed, the molten plastic can easily leak outside the mold, resulting in waste of raw materials, contamination of the mold and production environment, and increased cleaning and maintenance workload. The nozzle sealing assembly effectively prevents molten plastic leakage, ensuring a clean and efficient injection molding process.

[0081] A sealed injection chamber provides a stable environment for the molding of plastic melt, preventing the entry of external air and impurities, reducing defects such as pores and bubbles inside the product, and improving the density and strength of the product. In addition, the flow of plastic melt is more uniform in a sealed state, which helps to improve the dimensional accuracy and surface quality of the product, and produce high-quality injection molded products.

[0082] like Figures 1 to 8 As shown, the front end of the top pressure column 63 in this embodiment is also provided with a first injection groove 631 communicating with the injection molding chamber. The first injection groove 631 is also provided with a top pressure protrusion 630 and an injection protrusion 632. The top pressure protrusion 630 is concentrically arranged with the first injection groove 631, and the top pressure protrusion 630 can abut against the front end of the nozzle 4. The two ends of the injection protrusion 632 are respectively connected to the top pressure protrusion 630 and the inner wall of the first injection groove 631, so that the injection molded body can also enter the first injection groove 631 to realize the irregular injection molding of the nozzle cap 41.

[0083] Before the injection molding operation begins, the second drive unit is in the initial state. The top pressure block carries the top pressure column away from the front end of the mold component. The top pressure column separates from the nozzle. At this time, the injection molding machine heats and melts the plastic raw material into an injection molded body with good fluidity, waiting for the injection molding command.

[0084] When ready for injection molding, the second drive device is activated, pushing the top pressure block forward so that the top pressure column approaches and passes through the top pressure hole. The top pressure protrusion at the front end of the top pressure column abuts against the front end of the nozzle, thus sealing the injection molding chamber. At the same time, since the top pressure protrusion is concentrically set with the first injection groove, and the injection groove protrusion connects the top pressure protrusion and the inner wall of the first injection groove, a specific injection channel is formed.

[0085] The injection molding machine starts working, and the injection molded material is extruded from the nozzle. A portion of the injection molded material enters the injection chamber directly to form the main body of the product; another portion flows through the nozzle tip into the first injection groove at the front end of the top pressure post. In the first injection groove, the injection molded material flows around and fills the top pressure post and the injection post, ultimately forming an irregular structure in this area that corresponds to the shape of the first injection groove, the top pressure post, and the injection post, thus achieving irregular injection molding of the nozzle cap.

[0086] After injection molding is completed, the second drive device drives the top pressure column out of the top pressure hole, releases the seal, and after the mold is opened, the product with the irregular structure is taken out. Then the top pressure column and the mold are cleaned to prepare for the next injection molding.

[0087] By setting a first injection groove, an upper pressure protrusion, and an injection protrusion at the front end of the top pressure column, specific irregular structures can be formed simultaneously during the injection molding process, meeting the diverse design requirements of products. No additional processing steps are required to manufacture these irregular parts, thus improving production efficiency and the degree of product integration.

[0088] Irregular shapes can give products more functions, such as increasing the stability of product connections and improving the flow performance of fluids. At the same time, the unique irregular shape can also enhance the product's aesthetics and recognizability, making the product more competitive in the market.

[0089] Directly molding irregular structures during the injection molding process can leverage the high precision of the injection molding technology to ensure the dimensional and positional accuracy of the irregular structure relative to the main body of the product. Furthermore, since the injection molded body is formed in a sealed injection environment, the surface and internal quality of the irregular structure can be well guaranteed, reducing the occurrence of defects.

[0090] like Figures 1 to 8 As shown, the front end of the top pressure protrusion 630 in this embodiment is also provided with a sealing protrusion 633. The sealing protrusion 633 can be inserted into the nozzle 4 through the through hole at the front end of the nozzle 4, thereby further improving the sealing performance between the top pressure protrusion 630 and the nozzle 4.

[0091] Before the injection molding operation begins, the top pressure column is in the initial position away from the nozzle, and the sealing protrusion is not in contact with the through hole at the front end of the nozzle. The injection molding system is in the preparation stage. At this time, the injection molding machine heats the plastic raw material to a molten state and waits for the injection instruction.

[0092] When the injection molding is ready, the second drive device pushes the top pressure block forward, so that the top pressure column moves towards the nozzle. The top pressure protrusion gradually approaches the front end of the nozzle. When it reaches the appropriate position, the sealing protrusion at the front end of the top pressure protrusion aligns with the through hole at the front end of the nozzle. As the top pressure column continues to advance, the sealing protrusion passes through the through hole and enters the nozzle to a certain depth.

[0093] During this process, the sealing protrusion fits tightly against the inner wall of the through hole. By utilizing the contact area between the two and an appropriate interference fit (if designed with an interference amount), the injection molding material is prevented from leaking from the connection between the top pressure protrusion and the nozzle tip. At the same time, the top pressure protrusion itself abuts against the nozzle tip, further enhancing the overall sealing effect and forming a relatively closed injection channel, ensuring that the injection molding material can flow into the injection chamber along the predetermined path.

[0094] After sealing is completed, the injection molding machine is started, and the injection body is extruded from the nozzle and enters the injection chamber through the well-sealed channel to form the product. Throughout the injection process, the sealing protrusion continuously maintains the sealing effect on the through hole, preventing the injection body from overflowing under high pressure and ensuring the stability of the injection process.

[0095] After injection molding is completed, the second drive device drives the top pressure column to retract, the sealing protrusion exits from the nozzle through hole, the sealing state is released, and then the mold opening operation is performed to remove the molded product. The top pressure column returns to the initial position to prepare for the next injection molding.

[0096] The sealing protrusion penetrates the through hole at the front end of the nozzle, greatly increasing the sealing contact area and the length of the sealing path. Compared with simply relying on the top pressure protrusion to contact the nozzle front plane for sealing, this design can more effectively prevent the injection molding material from leaking during high-pressure injection molding, prevent the injection molding material from entering the nozzle, and ensure the stable formation of the nozzle cap.

[0097] A stable seal is crucial for a smooth injection molding process. The design of the sealing protrusion ensures a tighter and more reliable connection between the top protrusion and the nozzle, reducing the risk of pressure fluctuations and leaks during injection. This helps maintain stable injection pressure, allowing the molded body to fill the injection chamber at a uniform speed and pressure, thereby improving the dimensional accuracy and consistency of the product.

[0098] like Figures 1 to 8 As shown, the injection channel in this embodiment includes a plurality of injection holes 15 provided in the upper mold 1 and a second injection groove 221 provided in the lower mold 2 and connected to the second cavity 22. When the upper mold 1 and the lower mold 2 are closed, the bottom of the injection hole 15 is connected to the second injection groove 221.

[0099] Specifically, simultaneous feeding from multiple injection holes can significantly shorten injection time, allowing the injection molded body to fill the cavity more quickly, reducing the product molding cycle and improving production efficiency. In large-scale production, this efficiency improvement can bring considerable economic benefits and reduce production costs.

[0100] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A nozzle-type liquid silicone mold structure, characterized in that: The mold includes a mold component, which includes an upper mold (1) and a lower mold (2), and a movable insert (3) is detachably connected between the two. The movable insert (3) is provided with a plurality of assembly parts (31) that can assemble nozzles (4). The bottom of the upper mold (1) is provided with a plurality of first fixed cavities (11) that can accommodate the nozzles (4). Each first fixed cavity (11) has a recessed first cavity (12) at its front end. The top of the lower mold (2) is provided with a plurality of second fixed cavities (21) corresponding to the first fixed cavities (11). Each second fixed cavity (21) has a recessed second cavity (22) at its front end. When the upper mold (1) and the lower mold (2) are closed, the first fixed cavity (11) and the second fixed cavity (21) surround and form a fixed chamber for positioning and fixing the nozzles (4). The first cavity (12) and the second cavity (22) surround and form an injection chamber for injection molding into a nozzle cap (41) at the front end of the nozzles (4). The mold component is provided with an injection channel communicating with the injection chamber.

2. The nozzle liquid silicone mold structure according to claim 1, characterized in that: The assembly part (31) includes an assembly hole that can be inserted into the rear end of the corresponding nozzle (4).

3. The nozzle liquid silicone mold structure according to claim 1, characterized in that: A first positioning component is provided between the upper mold (1) and the movable insert (3). The first positioning component includes a first positioning groove (13) located at the bottom of the upper mold (1). The movable insert (3) can be assembled into the first positioning groove (13).

4. The nozzle liquid silicone mold structure according to claim 3, characterized in that: The first positioning component also includes a positioning post (32) on the top of the movable insert (3) and a positioning hole (14) on the upper mold (1). The positioning hole (14) is located above the first positioning groove (13) and the two are connected. The positioning post (32) can be inserted into the positioning hole (14).

5. The nozzle liquid silicone mold structure according to claim 1, characterized in that: A second positioning component is provided between the lower mold (2) and the movable insert (3). The second positioning component includes a second positioning groove (23) located on the top of the lower mold (2). The movable insert (3) can be assembled into the second positioning groove (23).

6. The nozzle liquid silicone mold structure according to claim 5, characterized in that: The second positioning component also includes a third positioning groove (24) provided on the lower mold (2) and a positioning block (33) provided on the bottom of the movable insert (3). The third positioning groove (24) is located below the second positioning groove (23) and the two are connected. The positioning block (33) can be inserted into the third positioning groove (24).

7. The nozzle liquid silicone mold structure according to claim 2, characterized in that: The mold structure also includes a pin support assembly (5) located at the rear end of the mold component. The pin support assembly (5) includes a first driving device (51), a pin mounting block (52) located at the output end of the first driving device (51), and a plurality of pins (53) located on the pin mounting block (52). The mounting hole is a through hole, and each pin (53) can be inserted into the nozzle (4) through the corresponding mounting hole to support the nozzle (4).

8. The nozzle liquid silicone mold structure according to claim 7, characterized in that: The mold structure also includes a nozzle sealing assembly (6) located at the front end of the mold component. The nozzle sealing assembly (6) includes a second driving device (61), a top pressure block (62) located at the output end of the second driving device (61), and a plurality of top pressure columns (63) located on the top pressure block (62). Each injection chamber has a top pressure hole (7) at its front end. The front end of the top pressure column (63) can pass through the top pressure hole (7) and abut against the front end of the nozzle (4). The top pressure column (63) can abut against the top pressure hole (7) so that the injection chamber is in a relatively sealed state.

9. The nozzle liquid silicone mold structure according to claim 8, characterized in that: The front end of the top pressure column (63) is also provided with a first injection groove (631) communicating with the injection cavity. The first injection groove (631) is also provided with a top pressure protrusion (630) and an injection protrusion (632). The top pressure protrusion (630) is concentrically arranged with the first injection groove (631), and the top pressure protrusion (630) can abut against the front end of the nozzle (4). The two ends of the injection protrusion (632) are respectively connected to the inner wall of the top pressure protrusion (630) and the first injection groove (631).

10. The nozzle liquid silicone mold structure according to claim 9, characterized in that: The front end of the top pressing protrusion (630) is also provided with a sealing protrusion (633), which can be inserted into the nozzle (4) through the through hole at the front end.

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