Double-color injection mold

Abstract

The invention relates to the field of injection molding, in particular to a double-color injection mold which comprises a first injection mold and a second injection mold. A first injection molding cavity and a second injection molding cavity can be formed between a first injection front mold and a first injection rear mold of the first injection mold, the first injection front mold is provided with a first runner and a second runner, the first runner is communicated with the first injection molding cavity, the second runner is communicated with the second injection molding cavity, and a discharge port of a first injection mold nozzle can be rotationally switched to be communicated with the first runner or the second runner; a third injection molding cavity and a fourth injection molding cavity can be formed between a second injection front mold and a second injection rear mold of the second injection mold, the second injection front mold is provided with a third runner communicated with the third injection molding cavity and the fourth injection molding cavity, the pore forming structure comprises a first cylindrical rod and a second cylindrical rod which slide relative to the second injection front mold, and the first injection rear mold and the second injection rear mold are rotationally switched; and the second-injection push rod structure is used for pushing the injection-molded part subjected to second-injection to be separated from the second-injection rear mold. Double-color injection molding and pore-forming injection molding can be carried out on different products at the same time, the injection molding machining efficiency is improved, and meanwhile the phenomenon that demolding is difficult is effectively avoided.

Description

Technical Field

[0001] This application relates to the field of injection molding, and in particular to a two-color injection mold. Background Technology

[0002] With the development of industries such as electronics, the demand for injection-molded products with different color or material combinations is increasing. Taking the plus and minus buttons and levers in mobile phones and other electronic products as examples, the product needs to display two different colors from bottom to top or from inside to outside, which places corresponding demands on the injection mold. Two-color injection molds, due to their high efficiency, have been widely used in the injection molding field. They not only improve the aesthetics of injection-molded products but also facilitate the fitting of different plastic materials, providing convenience for product assembly. The reliability of switching between the one-color cavity and the two-color cavity within a two-color injection mold is crucial, and its application is of great significance for improving the quality and production efficiency of injection-molded products. Currently, most two-color injection molding machines use the movement of the moving mold core to create the one-color and two-color injection cavities respectively to achieve the switching between the one-color and two-color molds. Furthermore, when performing two-color injection molding of multiple products, different two-color injection molding machines are often required to simultaneously produce different two-color injection-molded products. Especially for products with porous structures and variations in the outer diameter of the single-color and two-color cavities, multiple injection molding processes are typically required. This means multiple injection molding operations on different single-color injection molding machines are needed to achieve the two-color, porous structure of the product. However, existing two-color injection molds have significant drawbacks in practical applications. A single two-color injection molding machine can only complete the injection molding of one type of product, and cannot simultaneously perform two-color injection molding of different products. This forces different products to be produced using separate, customized two-color injection molding machines, resulting in low production efficiency. Furthermore, existing two-color injection molding machines struggle to simultaneously perform two-color injection molding and cavity-forming injection molding on products with porous structures and variations in the outer diameter of the single-color and two-color cavities. Additionally, existing molds may experience demolding difficulties during the demolding process. Summary of the Invention

[0003] In order to enable a two-color injection molding machine to perform two-color injection molding and hole-forming injection molding on different products simultaneously, thereby improving the injection molding efficiency and preventing color mixing and effectively avoiding demolding difficulties, this application provides a two-color injection mold.

[0004] This application provides a two-color injection mold, including a first-shot mold and a second-shot mold. The first-shot mold includes a first-shot nozzle, a first-shot front mold, a first-shot rear mold, and a first-shot ejector structure. The first-shot front mold and the first-shot rear mold, in the mold-closed state, form at least one first injection cavity and a second injection cavity. The first-shot front mold is provided with a first flow channel and a second flow channel. A central flow channel is provided at the intersection of the first flow channel and the second flow channel. The first flow channel communicates with the first injection cavity, and the second flow channel communicates with the second injection cavity. The discharge end of the first-shot nozzle is located within the central flow channel, and its discharge port can be rotatably switched to communicate with either the first flow channel or the second flow channel. The second-shot mold includes two-shot nozzles, two-shot front molds, two-shot rear molds, a hole-forming structure, and a two-shot ejector structure. The two-shot front molds and the two-shot rear molds, in the mold-closed state, form at least one first injection cavity and a second injection cavity. The mold has three injection cavities and a fourth injection cavity. The two-shot pre-mold is provided with a third flow channel. One end of the third flow channel is connected to the discharge end of the two-shot nozzle, and the other end of the third flow channel is connected to both the third and fourth injection cavities. The hole-forming structure includes a first cylindrical rod and a second cylindrical rod that are slidably disposed in the two-shot pre-mold through a first inclined sliding structure and a second inclined sliding structure, respectively. The first cylindrical rod extends into the third injection cavity, and the second cylindrical rod extends into the fourth injection cavity. The first-shot post-mold and the second-shot post-mold rotate and switch. When the two-shot pre-mold and the two-shot post-mold open, the two-shot push rod structure is used to push the injection molded part after the second shot to detach from the two-shot post-mold. The first cylindrical rod and the second cylindrical rod both move relative to the two-shot pre-mold to allow the injection molded part to detach from the two-shot pre-mold. By adopting the above technical solution, a single-color injection molded part is obtained through injection molding in a first-shot mold, while a two-color injection molded part is obtained through injection molding in a second-shot mold. Due to the rotational switching between the first-shot rear mold and the second-shot rear mold, the single-color injection molded part after the first injection is switched to the lower part of the second-shot front mold for a second injection to obtain a two-color injection molded part. Specifically, the first-shot front mold and the first-shot rear mold are closed to form at least one set of first injection cavity and second injection cavity. The first runner and the second runner in the first-shot front mold have a central runner at their intersection. The discharge end of the first-shot nozzle is located in the central runner, and the discharge port can be rotatably switched to connect with either the first runner or the second runner. This allows the injection material to selectively flow into the first or second injection cavity as needed, enabling the first injection of different products to be completed in one mold, thus improving the versatility of the mold and production efficiency. At the same time, the two-shot mold's front and rear molds are combined to form the third and fourth injection cavities. One end of the third runner of the front mold is connected to the discharge end of the second-shot nozzle, and the other end is connected to both the third and fourth injection cavities, allowing for secondary injection of both cavities simultaneously, further improving production efficiency.The first and second cylindrical rods of the hole-forming structure are slidably disposed within the pre-mold of the second injection molding process via a first and second inclined sliding structure, respectively, and extend into the third and fourth injection cavities. During injection molding, holes can be formed in the product, solving the problem that existing molds struggle to perform two-color injection molding and hole-forming on products with hole-like structures. During mold opening after the second injection molding, the second-injection ejector structure pushes the molded part after the second injection to detach from the post-injection mold. Simultaneously, the first and second cylindrical rods move relative to the pre-mold of the second injection, thereby causing the molded part to detach from the pre-mold, avoiding obstruction of demolding by the cylindrical rods, solving the problem of difficult demolding, ensuring smooth production, and improving product quality and production efficiency. Preferably, the discharge end of the first injection nozzle is rotatably connected to the pre-mold of the first injection through a hollow rotating shaft, the end of which is provided with the discharge port, and the rotation angle of the rotating shaft is 0°-360°. By adopting the above technical solution, the discharge end of the injection nozzle is rotatably connected to the pre-injection mold via a hollow rotating shaft, and the end of the rotating shaft is provided with an discharge port. The rotation angle of the rotating shaft is 0°-360°. This allows the rotating shaft to rotate flexibly, thereby allowing the discharge port to switch positions within a large range. Since the pre-injection mold is provided with a first flow channel and a second flow channel, and a central flow channel is provided at the intersection of the first and second flow channels, the discharge end of the injection nozzle is located in the central flow channel. The rotation of the rotating shaft allows the discharge port to rotate and switch to connect with the first or second flow channel, thereby enabling the injection material to selectively flow into the first injection cavity or the second injection cavity as needed, meeting different injection requirements and improving the flexibility and efficiency of injection molding. Preferably, the injection push rod structure includes a first push rod and a first moving plate. One end of the first push rod extends into the post-injection mold and surrounds the pre-injection mold to form the first injection cavity and the second injection cavity, and the other end of the first push rod is connected to the first moving plate. By adopting the above technical solution, when the first injection mold is located directly below the first injection mold, the first injection push rod structure will not eject the injection part; instead, it will rotate the injection part together to the underside of the second injection mold. After the first injection mold rotates and switches to the underside of the second injection mold to complete the second injection, the first injection push rod structure can then push the injection part out of the mold under the drive of an external drive source, facilitating subsequent processing of the injection part and improving production efficiency. Preferably, the second injection push rod structure includes a second push rod and a second moving plate. One end of the second push rod extends into the second injection mold and surrounds the second injection mold to form the third injection cavity and the fourth injection cavity. The other end of the second push rod is connected to the second moving plate, and the second moving plate is externally connected to a drive source to drive the second push rod to move towards the second injection mold. By adopting the above technical solution, the second moving plate of the second injection push rod structure is externally connected to a drive source, which provides power so that the second moving plate can drive the second push rod connected to it to move.Since one end of the second push rod extends into the third and fourth injection cavities formed by the rear mold and the front mold of the second injection, when the second push rod moves towards the front mold under the drive of the drive source, it can push the injection molded parts in the third and fourth injection cavities to detach from the rear mold, thereby effectively solving the problem of difficult demolding in existing molds and improving demolding efficiency. Preferably, the first inclined sliding structure includes a first guide rail, the first guide rail is provided with a first inclined surface, the first inclined surface is provided with a first groove, and the end of the first cylindrical rod is provided with a first slider that matches the first groove. By adopting the above technical solution, the first inclined sliding structure is provided with a first guide rail, and the first inclined surface on the first guide rail is provided with a first groove. The first slider at the end of the first cylindrical rod matches the first groove. When the two-shot pre-mold and the two-shot post-mold open, the first cylindrical rod is subjected to the mold opening force, and the first slider slides in the first groove. Since the first groove is provided on the inclined first inclined surface, this inclined structure allows the first cylindrical rod to move relative to the two-shot pre-mold, thereby allowing the injection molded part to smoothly detach from the two-shot pre-mold, achieving smooth demolding and effectively avoiding demolding difficulties. Preferably, the second inclined sliding structure includes a second guide rail, the second guide rail is provided with a second inclined surface, the second inclined surface is provided with a second groove, and the end of the second cylindrical rod is provided with a second slider that matches the second groove. By adopting the above technical solution, the second inclined surface on the second guide rail in the second inclined sliding structure is provided with a second groove, and the second slider at the end of the second cylindrical rod can match the second groove. When the front and rear molds of the second injection molding process open, the second cylindrical rod moves relative to the front mold due to the cooperation between the second slider and the second groove, as well as the guiding effect of the second inclined surface. This prevents the second cylindrical rod from obstructing the injection molded part from leaving the front mold, ensuring smooth demolding. Preferably, the extension lines of the first and second cylindrical rods intersect and form an angle with the opening facing the injection molded part. By adopting the above technical solution, since the extension lines of the first and second cylindrical rods intersect and form an angle with the opening facing the injection molded part, this special angle setting allows the first and second cylindrical rods to not only help the injection molded part leave the rear mold when moving relative to the front mold, but also facilitates the smoother extraction of the first cylindrical rod from the injection molded part, avoiding excessive interference with the injection molded part. This facilitates demolding and improves demolding efficiency and success rate. Preferably, the first and second inclined surfaces form an angle with the opening facing the injection molded part.By adopting the above technical solution, the first inclined surface and the second inclined surface form an angle with the opening facing the injection molded part. When the two-shot front mold and the two-shot rear mold open, due to this angle setting, the first cylindrical rod and the second cylindrical rod, under the action of the first inclined sliding structure and the second inclined sliding structure, can not only drive the injection molded part to detach from the two-shot rear mold, but also facilitate the smoother movement of the second cylindrical rod relative to the two-shot front mold, avoiding obstruction or damage to the injection molded part, thereby enabling the injection molded part to be demolded smoothly, improving the smoothness and efficiency of demolding. Preferably, the number of discharge ports of the first runner, the second runner, the third runner, and the rotating shaft are all two. By adopting the above technical solution, the number of discharge ports of the first runner, the second runner, the third runner, and the rotating shaft are all set to two, which enables simultaneous injection operations on two different injection cavities in one injection process. Because there are two sets of flow channels and outlets corresponding to two sets of injection cavities, different colored injection molding materials can be simultaneously delivered to different injection cavities. This allows for the simultaneous production of two two-color injection molded parts, avoiding the time spent producing two-color injection molded parts one by one, thus effectively improving injection molding efficiency and meeting the production process's demand for increased output and efficiency. Preferably, elastic recovery structures are provided between the first moving plate and the first injection mold, and between the second moving plate and the second injection mold, for driving the moving plates to recover. By adopting the above technical solution, when the first injection ejector structure needs to perform an ejection action, the first moving plate is driven by the drive source to move the first ejector, pushing the injection molded part out of the mold; when the second injection ejector structure needs to perform an ejection action, the second moving plate is driven by the drive source to move the second ejector, pushing the injection molded part out of the mold. After the push rod completes its pushing action, since there are elastic recovery structures between the first moving plate and the first injection mold, and between the second moving plate and the second injection mold, these elastic recovery structures provide power for the elastic structure to recover its deformation after compression. Based on the characteristic of the elastic structure to recover its deformation, the first and second moving plates are driven back to their initial positions, realizing the automatic recovery of the moving plates, so as to prepare for the next injection molding operation, improve injection molding efficiency, and reduce manual operation costs.

[0005] In summary, this application includes at least one of the following beneficial technical effects: 1. In a single-shot mold, the first injection mold and the first injection rear mold are joined together to form at least one first injection cavity and a second injection cavity. The nozzle of the first injection mold can be rotated and switched to connect with the first flow channel or the second flow channel, so that injection materials of different colors can enter the first injection cavity and the second injection cavity respectively to complete the first injection of different products in different colors. In a two-shot mold, the second injection mold and the second injection rear mold are joined together to form a third injection cavity and a fourth injection cavity. The injection materials of the second injection mold nozzle enter the third injection cavity and the fourth injection cavity simultaneously through the third flow channel to complete the second injection of different products in the same color. Thus, two-color injection of different products can be completed simultaneously, improving production efficiency. 2. The two-shot mold is equipped with a sliding hole-forming structure. The first cylindrical rod extends into the third injection cavity, and the second cylindrical rod extends into the fourth injection cavity. During the injection process, the first and second cylindrical rods occupy a certain space and are pulled out after the injection is completed. Holes can be formed on products with a hole-like structure and a change in the outer contour diameter between the one-color cavity and the two-color cavity, so as to realize two-color injection molding and hole-forming for this type of product. 3. The first-shot ejector structure and the second-shot ejector structure are used to push the injection molded part out of the first-shot rear mold and the second-shot rear mold, respectively. When the second-shot front mold and the second-shot rear mold open, the first cylindrical rod and the second cylindrical rod move relative to the second-shot front mold, which reduces the constraint between the injection molded part and the second-shot front mold and solves the problem of difficult demolding. Attached Figure Description

[0006] Figure 1 This is an exploded view of the two-color injection mold of this application; Figure 2 This is a structural diagram of the two-color injection mold of this application; Figure 3 This is a structural diagram of the first and second pre-injection templates of the two-color injection mold of this application; Figure 4 This is a left view of the two-color injection mold of this application; Figure 5 yes Figure 4 AA cross-section view; Figure 6 This is a left view of the two-color injection mold of this application; Figure 7 yes Figure 6 BB cross-section.

[0007] Explanation of reference numerals in the attached drawings: 1. First injection mold; 2. Second injection mold; 11. First injection nozzle; 12. First injection front mold; 13. First injection rear mold; 14. First injection ejector structure; 15. First injection cavity; 16. Second injection cavity; 111. First discharge port; 121. First injection front template; 1211. First runner; 1212. Second runner; 1213. First central runner; 131. First injection rear template; 141. First ejector; 142. First moving plate; 143. First elastic recovery structure; 21. Second injection nozzle; 22. Second injection front mold; 23. Second injection rear mold; 24. Hole-forming structure; 25. Second injection ejector structure; 26. Third injection cavity; 27. Fourth injection cavity; 211. Second discharge port; 221. Pre-injection template; 2211. Third runner; 2212. Second central runner; 231. Post-injection template; 241. First inclined sliding structure; 242. First cylindrical rod; 243. Second inclined sliding structure; 244. Second cylindrical rod; 2411. First guide rail; 2412. First inclined surface; 2421. First slider; 2431. Second guide rail; 2432. Second inclined surface; 2441. Second slider; 251. Second push rod; 252. Second moving plate; 253. Second elastic recovery structure. Detailed Implementation

[0008] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0009] This application provides a two-color injection mold, referring to... Figure 1 and Figure 2 It includes a first injection mold 1 and a second injection mold 2. The first injection mold 1 and the second injection mold 2 work together to complete two-color injection molding and hole making for different products, thereby improving production efficiency.

[0010] Specifically, the injection mold 1 includes an injection nozzle 11, a front injection mold 12, a rear injection mold 13, and an injection ejector structure 14. The front injection mold 12 and the rear injection mold 13 form two sets of first injection cavities 15 and second injection cavities 16 when the mold is closed. Each set includes two first injection cavities 15 arranged side-by-side and two second injection cavities 16 arranged side-by-side. The first injection cavities 15 and the second injection cavities 16 have different shapes, thus allowing them to be used for simultaneous injection molding of different products.

[0011] The first injection mold 12 comprises a top plate, a cooling plate, and a first injection template 121. The top plate, cooling plate, and first injection template 121 are regular rectangles, connected at their four corners by connecting shafts. The first injection template 121 is used to form a compression mold fit with the first injection mold 13. The cooling plate has internal heat exchange pipes for liquid cooling. The injection nozzle 11 passes through the top plate, cooling plate, and first injection template 121. The inlet of the injection nozzle 11 is located at the top of the top plate and is used to connect with external material conveying components. The injection mold 13 consists of a base plate, an injection mold 131, and two side plates. The base plate, the injection mold 131, and the side plates are all regular rectangles and are connected by a connecting shaft. The base plate and the injection mold 131 are arranged opposite to each other, and the two side plates are arranged opposite to each other and are located at the base plate and the injection mold 131. The base plate, the injection mold 131, and the two side plates enclose a cavity. The injection push rod structure 14 is set in the cavity. The injection mold 121 and the injection mold 131 can be pressed to form an injection cavity structure.

[0012] Reference Figure 3 The injection mold 121 has two opposing first flow channels 1211 and two opposing second flow channels 1212, which converge at a first central flow channel 1213. The two first flow channels 1211 are connected to two sets of first injection cavities 15, and the two second flow channels 1212 are connected to two sets of second injection cavities 16. The discharge end of the injection nozzle 11 is connected to a rotating shaft located within the first central flow channel 1213. The rotating shaft has a hollow structure in the middle to facilitate fluid flow, and two opposing first discharge ports 111 are located at its ends. These first discharge ports 111 are connected to either the two first flow channels 1211 or the two second flow channels 1212. When connected to an external drive source, the rotating shaft is driven to rotate, causing the two first discharge ports 111 to switch between connecting to either the two first flow channels 1211 or the two second flow channels 1212. This design allows the injection mold 1 to inject different colored injection materials into the first injection cavity 15 or the second injection cavity 16 as needed. In this embodiment, the rotation angle range of the rotating shaft is 0°-360°. The rotating shaft and the injection front mold 12 can be connected by bearings to reduce friction during rotation.

[0013] Reference Figure 4 and Figure 5The injection pusher structure 14 includes a first pusher 141, a first moving plate 142, and a first elastic recovery structure 143, all disposed within the cavity of the post-injection mold 13. One end of the first pusher 141 extends into the first injection cavity 15 and the second injection cavity 16 formed by the post-injection mold 131 and the pre-injection mold 12, while the other end is connected to the first moving plate 142. In this embodiment, the injection pusher structure 14 does not move within the first injection mold 1; it can only eject the injection molded part when it moves into the second injection mold 2. The first pusher 141 is a solid cylindrical rod, which can be made of carbon steel and has high strength. The number of first pushers 141 in this embodiment is adjusted according to actual needs. The first elastic recovery structure 143 is disposed between the first moving plate 142 and the post-injection mold 131 and is used to drive the moving plate to recover. The first elastic recovery structure 143 is a combination of a conventional guide post and a spring. The guide post connects the first moving plate 142 and a post-shot template 131. The spring is sleeved on the outer wall of the guide post. One end of the spring is connected to the post-shot template 131, and the other end is connected to the first moving plate 142. When the driving source removes the force on the first moving plate 142, the spring can make the first moving plate 142 return to the initial position.

[0014] The combination logic of the first injection mold 1 is as follows: the first injection front mold 12 and the first injection rear mold 13 are closed to form an injection cavity. The first injection nozzle 11 achieves switching and connection between the first discharge port 111 and the first flow channel 1211 or the second flow channel 1212 through the rotation of the rotating shaft, and injects different colored injection materials into the corresponding injection cavities in sequence. After injection is completed, the first injection rear mold 13 drives the injection part of one color to rotate and move to the second injection mold 2 for secondary injection.

[0015] Reference Figure 6 and Figure 7 Specifically, in this embodiment, the two-shot mold 2 includes a two-shot nozzle 21, a two-shot front mold 22, a two-shot rear mold 23, a hole-making structure 24, and a two-shot push rod structure 25. Two sets of third injection cavities 26 and fourth injection cavities 27 are formed between the two-shot front mold 22 and the two-shot rear mold 23 in the mold closing state. Each set includes two third injection cavities 26 and two fourth injection cavities 27. The two-shot front mold 22 is provided with two third runners 2211. The intersection of the two third runners 2211 is also provided with a second central runner 2212 similar to that in the one-shot mold 1. Each third runner 2211 is connected to a set of third injection cavities 26 and fourth injection cavities 27. One end of the two third runners 2211 is connected to the discharge end of the two-shot nozzle 21 through the second central runner 2212. Specifically, the discharge end of the two-shot nozzle 21 also has two oppositely arranged second discharge ports 211 that are connected to the third runners 2211. The other end of each third runner 2211 is connected to a third injection cavity 26 and a fourth injection cavity 27.

[0016] The second-shot front mold 22 comprises a top plate, a cooling plate, and a second-shot front template 221. The top plate, cooling plate, and second-shot front template 221 are regular rectangles, connected at their four corners by connecting shafts. The second-shot front template 221 forms a compression mold fit with the second-shot rear mold 23. The cooling plate has internal heat exchange pipes for liquid cooling. The second-shot nozzle 21 passes through the top plate, cooling plate, and second-shot front template 221. The nozzle's inlet is located at the top of the top plate for communication with external material conveying components. The second-shot rear mold 23... Similar to the structure of the first-shot mold 13, it consists of a base plate, a second-shot mold plate 231, and two side plates. The base plate, second-shot mold plate 231, and side plates are all regular rectangles, connected by a connecting shaft. The base plate and second-shot mold plate 231 are positioned opposite each other, and the two side plates are also positioned opposite each other and located within the base plate and second-shot mold plate 231. The base plate, second-shot mold plate 231, and two side plates enclose a cavity, within which the second-shot ejector structure 25 is located. The second-shot mold plate 221 and second-shot mold plate 231 can press together to form the injection cavity structure. Specifically, when the first-shot mold 1 and the second-shot mold 2 are installed in a two-color injection molding machine, the first-shot mold 13 and the second-shot mold 23 can be rotated and switched.

[0017] The hole-forming structure 24 includes a first inclined sliding structure 241, a first cylindrical rod 242, a second inclined sliding structure 243, and a second cylindrical rod 244. The first cylindrical rod 242 is slidably disposed within the second-shot pre-mold 22 via the first inclined sliding structure 241, and the second cylindrical rod 244 is slidably disposed within the second-shot pre-mold 22 via the second inclined sliding structure 243. The first cylindrical rod 242 extends into the third injection cavity 26, and the second cylindrical rod 244 extends into the fourth injection cavity 27. In this embodiment, the quantities of the first cylindrical rod 242 and the second cylindrical rod 244 are adjusted according to actual needs. Specifically, the first inclined sliding structure 241 includes a first guide rail 2411, the first guide rail 2411 is provided with a first inclined surface 2412, the first inclined surface 2412 is provided with a first groove, and the end of the first cylindrical rod 242 is provided with a first slider 2421 that matches the first groove. The second inclined sliding structure 243 includes a second guide rail 2431, a second inclined surface 2432, and a second groove. The end of the second cylindrical rod 244 is provided with a second slider 2441 that matches the second groove. The material and structure of the second guide rail 2431 and the second slider 2441 are similar to those of the first guide rail 2411 and the first slider 2421. The extension lines of the first cylindrical rod 242 and the second cylindrical rod 244 intersect and form an angle with the opening facing the injection molded part. The first inclined surface 2412 and the second inclined surface 2432 also form an angle with the opening facing the injection molded part. This design allows the first cylindrical rod 242 and the second cylindrical rod 244, along with the ejector structure, to work together during mold opening, enabling smooth demolding of the injection molded part.

[0018] The two-shot ejector structure 25 and the one-shot ejector structure 14 have the same structure and function. Both are used to push the molded part out of the two-shot rear mold 23 after the second injection is completed under the two-shot front mold 22. The two-shot ejector structure 25 includes a second ejector 251, a second moving plate 252, and a second elastic recovery structure 253, all disposed within the cavity of the two-shot rear mold 23. One end of the second ejector 251 extends into the third injection cavity 26 and the fourth injection cavity 27 formed by the two-shot rear mold 23 and the two-shot front mold 22. The other end of the second ejector 251 is connected to the second moving plate 252. In this embodiment, the number of second ejector 251 is adjusted according to actual needs. In this embodiment, the two-shot ejector structure 25 does not move within the one-shot mold 1; it only ejects the molded part when it moves into the two-shot mold 2. Furthermore, within the two-shot mold 2, an external drive source drives the second ejector 251 to move towards the two-shot front mold 22. The structure and material of the second push rod 251 and the second movable plate 252 are similar to those of the first push rod 141 and the first movable plate 142. The second elastic recovery structure 253 is a combination of a conventional guide post and a spring. The guide post connects the second movable plate 252 and the post-shot template 231. The spring is sleeved on the outer wall of the guide post. One end of the spring is connected to the post-shot template 231, and the other end is connected to the second movable plate 252. When the driving source removes the force on the second movable plate 252, the spring can return the second movable plate 252 to its initial position.

[0019] The combination logic of the two-shot mold 2 is as follows: the two-shot front mold 22 and the two-shot rear mold 23 close to form an injection cavity. The two-shot nozzle 21 injects the injection material into the third injection cavity 26 and the fourth injection cavity 27 through the third flow channel 2211. The hole-making structure 24 creates holes in the injection part during the injection process. After injection, during the mold opening process, the two-shot push rod structure 25, under the action of the drive source, pushes the injection part away from the two-shot rear mold 23. The second elastic recovery structure 253 resets the second moving plate 252. During mold opening, the first cylindrical rod 242 and the second cylindrical rod 244 move through the inclined sliding structure, facilitating the injection part to detach from the two-shot front mold 22, thus enabling the injection part to be completely demolded. This two-color injection mold is used in a two-color injection molding machine, mainly by rotating and exchanging the first-shot rear mold 13 and the second-shot rear mold 23 to achieve injection connection between the two molds. The specific process is as follows: The first-shot mold 13 transfers the single-color injection molded part to the second-shot mold 2 for two-color injection molding. After injection molding in the second-shot mold 2, the ejector structure and the hole-forming structure 24 assist in completely demolding the two-color injection molded part. Then, the empty second-shot mold 23 rotates back to the first-shot mold 1 for the next single-color injection molding, and the above steps are repeated. This combination allows for simultaneous two-color injection molding of different products that have undergone single-color injection molding, while simultaneously creating holes. It is suitable for products with a porous structure and where there is a change in the outer contour diameter between the single-color and two-color cavities.

[0020] The implementation principle of this embodiment is as follows: The two-color injection mold of this embodiment, through the multi-cavity design of the primary injection mold 1 and the rotational switching of the first discharge port 111 of the primary injection nozzle 11, can simultaneously complete one-color injection molding of different products in different colors. The multi-cavity design of the secondary injection mold 2 and the setting of the hole-forming structure 24 not only allow for simultaneous two-color injection molding of the same color on different products that have undergone one-color injection molding, but also enable hole forming on the products. Furthermore, during the demolding process, the entire mold, through the sliding cooperation of the push rod structure and the cylindrical rod via the inclined sliding structure, achieves smooth demolding of the injection molded parts. Compared with the prior art, this improves production efficiency, solves the problems of existing two-color injection molds being able to complete only one type of product injection molding and the difficulty in performing two-color injection molding and hole forming on specific products, while also avoiding demolding difficulties.

[0021] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A two-color injection mold, characterized in that, The system includes a first injection mold (1) and a second injection mold (2); the first injection mold (1) includes an injection nozzle (11), a front injection mold (12), a rear injection mold (13), and an injection push rod structure (14). The front injection mold (12) includes a front injection template (121), which is provided with a first runner (1211) and a second runner (1212). A central runner is provided at the intersection of the first runner (1211) and the second runner (1212). When the first injection mold (12) and the rear injection mold (13) are in the mold-closed state, at least one first injection cavity (15) and a second injection cavity (2) are formed. 16), the first flow channel (1211) is connected to the first injection cavity (15), the second flow channel (1212) is connected to the second injection cavity (16), the discharge end of the first injection nozzle (11) is located in the central flow channel, and its discharge port can be rotated to switch to be connected to the first flow channel (1211) or the second flow channel (1212); the two-shot mold (2) includes a two-shot nozzle (21), a two-shot front mold (22), a two-shot rear mold (23), a hole-making structure (24), and a two-shot push rod structure (25). The two-shot front mold (22) includes a two-shot front template (221), and the two-shot front mold (22) and The two injection molds (23) form a third injection cavity (26) and a fourth injection cavity (27) in the mold-closed state. The two injection mold (221) is provided with a third flow channel (2211). One end of the third flow channel (2211) is connected to the discharge end of the two injection nozzle (21), and the other end of the third flow channel (2211) is connected to both the third injection cavity (26) and the fourth injection cavity (27). The hole-making structure (24) includes a first cylindrical rod (242) and a second inclined sliding structure (243) that are slidably disposed in the two injection mold (22) through a first inclined sliding structure (241) and a second inclined sliding structure (243). Two cylindrical rods (244), the first cylindrical rod (242) extends into the third injection cavity (26), and the second cylindrical rod (244) extends into the fourth injection cavity (27). The first injection mold (13) and the second injection mold (23) rotate and switch. When the second injection mold (22) and the second injection mold (23) open, the second injection push rod structure (25) is used to push the injection molded part after the second injection to detach from the second injection mold (23). The first cylindrical rod (242) and the second cylindrical rod (244) both move relative to the second injection mold (22) so that the injection molded part can detach from the second injection mold (22).

2. The two-color injection mold according to claim 1, characterized in that, The discharge end of the injection nozzle (11) is rotatably connected to the injection mold (12) through a hollow rotating shaft. The discharge port is provided at the end of the rotating shaft, and the rotation angle of the rotating shaft is 0°-360°.

3. The two-color injection mold according to claim 1, characterized in that, The injection pusher structure (14) includes a first pusher (141) and a first moving plate (142). One end of the first pusher (141) extends into the post-injection mold (13) and surrounds the pre-injection mold (12) to form the first injection cavity (15) and the second injection cavity (16). The post-injection mold (13) includes a post-injection template (131). The other end of the first pusher (141) is connected to the first moving plate (142).

4. The two-color injection mold according to claim 3, characterized in that, The two-shot push rod structure (25) includes a second push rod (251) and a second moving plate (252). One end of the second push rod (251) extends into the two-shot rear mold (23) and surrounds the two-shot front mold (22) to form the third injection cavity (26) and the fourth injection cavity (27). The two-shot rear mold (23) includes a two-shot rear template (231). The other end of the second push rod (251) is connected to the second moving plate (252). The second moving plate (252) is connected to an external driving source to drive the second push rod (251) to move toward the two-shot front mold (22).

5. The two-color injection mold according to claim 1, characterized in that, The first inclined sliding structure (241) includes a first guide rail (2411), the first guide rail (2411) is provided with a first inclined surface (2412), the first inclined surface (2412) is provided with a first groove, and the end of the first cylindrical rod (242) is provided with a first slider (2421) that matches the first groove.

6. The two-color injection mold according to claim 5, characterized in that, The second inclined sliding structure (243) includes a second guide rail (2431), the second guide rail (2431) is provided with a second inclined surface (2432), the second inclined surface (2432) is provided with a second groove, and the end of the second cylindrical rod (244) is provided with a second slider (2441) that matches the second groove.

7. The two-color injection mold according to claim 1, characterized in that, The extension line of the first cylindrical rod (242) and the extension line of the second cylindrical rod (244) intersect and form an angle with the opening facing the injection molded part.

8. The two-color injection mold according to claim 6, characterized in that, The first inclined surface (2412) and the second inclined surface (2432) form an angle with the opening facing the injection molded part.

9. The two-color injection mold according to claim 2, characterized in that, The number of the first flow channel (1211), the second flow channel (1212), the third flow channel (2211), and the first discharge port (111) of the rotating shaft are all two.

10. The two-color injection mold according to claim 4, characterized in that, Elastic recovery structures are provided between the first movable plate (142) and the first post-injection template (131) of the first post-injection mold (13), and between the second movable plate (252) and the second post-injection template (231) of the second post-injection mold (23), for driving the movable plate to recover.

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