A two-color plastic product secondary forming injection mold

Abstract

The utility model discloses a kind of double-color plastic product secondary forming injection mould, belong to injection mould technical field, including injection mould and fixed pipeline, the upper surface of injection mould is fixedly connected with upper top cover, and pouring opening is arranged in upper top cover inside, and upper top cover upper surface is fixedly connected with connecting column close to the one end of pouring opening, while connecting column inner wall is fixedly connected with positioning column;The positioning column is symmetrically distributed about the center of the connecting column, the lower end of the fixed pipeline outside is fixedly connected with sealing ring, and fixed pipeline is slidably arranged in the connecting column inside.The double-color plastic product secondary forming injection mould, by the spacer plate and the shaft set, not only can ensure the color of product appearance clear and pure, but also can prevent unused plastic into mold cavity, avoid two color plastics mutual mixing, ensure that each plastic plays its expected performance in respective injection molding process, prolong the overall service life of mould.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a two-color plastic product secondary molding injection mold. Background Technology

[0002] Injection molds are specialized tools used for the mass production of plastic products, widely used in the plastics processing industry. Products are typically made using rubber injection molding and plastic injection molding. Injection molding can be further divided into injection molding compression molding and die casting. An injection molding machine (or simply injection molding machine) is the main molding equipment used to create various shapes of plastic products from thermoplastic or thermosetting materials using plastic molds. Injection molding is achieved through the injection molding machine and the mold. Two-color plastic product secondary molding injection molds refer to special molds that can sequentially inject two plastic materials on the same injection molding machine, molding them in two stages, but the product is only demolded once. These are also commonly called two-color molds and are widely used in consumer electronics, automotive interiors, and daily necessities. In secondary molding, because the plastic product is two-color, the workpiece needs to be removed after the first color is injected, placed in a new mold, and then the second color is injected. Adjusting the workpiece's position is also necessary, which is time-consuming and reduces the efficiency of the equipment.

[0003] To overcome the above-mentioned defects, the prior art (Chinese patent application number 202421540133.3, application date 2025-06-27) provides a two-color plastic product secondary molding injection mold, including a first molding mechanism. The first molding mechanism includes an upper mold, a first through hole on the left side surface of the upper mold, and an upper groove on the surface of the upper mold. A second molding mechanism is installed on the right side surface of the upper mold, including a lower mold, a lower groove on the surface of the lower mold, the upper groove and the lower groove forming a first groove. A rotating mechanism is installed on the right side surface of the lower mold, the rotating mechanism includes a rotating shaft, the end of the rotating shaft is fixedly connected to the right side surface of the lower mold, and the other end of the rotating shaft is fixedly connected to a motor. A connecting mechanism is installed on the right side surface of the upper mold, the connecting mechanism includes a second connecting plate, the left side surface of the second connecting plate is fixedly connected to the right side surface of the upper mold. This device completes secondary injection molding by changing the size of the first groove, eliminating the need to remove and reinstall the workpiece, thus improving the working efficiency of the device.

[0004] If the other injection port is not closed during product casting, the two colors of plastic may blend together, resulting in a chaotic outer shell color that fails to meet the design appearance requirements. For products with special material requirements, this can alter product performance, such as changing the properties of areas that originally possessed specific hardness and flexibility, thus affecting the product's functionality. Furthermore, if the aforementioned device cannot close the injection port during use, the two types of plastic will mix within the mold runner or cavity, resulting in color mixing and an inability to present a clear two-color effect. Problems such as blurred color transitions and color spots may occur, reducing the product's mechanical properties and aesthetics. Utility Model Content

[0005] The purpose of this utility model is to provide a two-color plastic product secondary molding injection mold to solve the problem mentioned in the background art that the inability to close the pouring gate causes the two plastics to mix in the mold channel or cavity, resulting in mixed colors, failure to present a clear two-color effect, and problems such as blurred color transition and color spots, which reduce the mechanical properties and aesthetics of the product.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a two-color plastic product secondary molding injection mold, comprising an injection mold and a fixed pipe, wherein an upper cover is fixedly connected to the upper surface of the injection mold, and a pouring port is opened inside the upper cover; a connecting column is fixedly connected to one end of the upper surface of the upper cover near the pouring port, and a positioning column is fixedly connected to the inner wall of the connecting column; the positioning columns are symmetrically distributed about the center of the connecting column; a sealing ring is fixedly connected to the lower outer end of the fixed pipe, and the fixed pipe is slidably disposed inside the connecting column; a positioning groove is opened inside the sealing ring; the positioning groove corresponds one-to-one with the positioning column; a rotating shaft is provided inside the upper cover through a reciprocating rotating assembly, and an isolation plate is fixedly connected to the surface of the rotating shaft, and the isolation plate is rotatably disposed on the upper cover.

[0007] Preferably, the sealing ring has a sliding groove inside, and one end of a fixing spring is fixedly connected to the surface of the sliding groove, while the other end of the fixing spring is fixedly connected to a sliding block.

[0008] Preferably, the sliding block is slidably disposed inside the sealing ring, and the sliding blocks are symmetrically distributed about the center of the sealing ring, and the outer side of the sliding block near the top cover is inclined.

[0009] Preferably, a baffle is fixedly connected to the outside of the connecting column, and a sliding column is slidably connected inside the baffle, and a fixing plate is fixedly connected to the surface of the sliding column near one end of the connecting column.

[0010] Preferably, a limiting rod is fixedly connected to the outside of the connecting column, and the limiting rod is slidably connected through the fixing plate, and a buffer spring is fixedly connected to the end of the fixing plate away from the baffle.

[0011] Preferably, the other end of the buffer spring is fixedly connected to the connecting post, and a push plate is fixedly connected to one end of the sliding post near the connecting post, and the push plate is slidably disposed inside the connecting post.

[0012] Preferably, the reciprocating rotation assembly includes a handwheel fixedly connected to the surface of the rotating shaft, and the handwheel is rotatably disposed outside the injection mold. One end of a torsion spring is fixedly connected to the surface of the upper cover, while the other end of the torsion spring is fixedly connected to the rotating shaft.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This two-color plastic product secondary molding injection mold adopts a novel structural design, the specific details of which are as follows:

[0014] (1) The two-color plastic product secondary molding injection mold, through the set isolation plate and rotating shaft, can not only ensure that the color of the product appearance is clear and pure, but also prevent unused plastic from entering the mold cavity, avoid the two colors of plastic from mixing with each other, ensure that each plastic performs its expected performance in its respective injection process, and extend the overall service life of the mold.

[0015] Furthermore, the isolation plate closes unused injection ports, effectively avoiding pressure fluctuations, allowing the plastic to flow smoothly within the runner, uniformly filling the cavity, and reducing the possibility of defects such as bubbles and shrinkage marks in the product.

[0016] (2) The two-color plastic product secondary molding injection mold, through the setting of fixed pipe and connecting column, reduces the adjustment links in the installation process. It can not only withstand the high pressure of the plastic melt in the pipe during the injection process, but also ensure that the pipe will not loosen or fall off during the injection process, thus ensuring the smooth progress of the injection process and ensuring the consistency of injection quality.

[0017] Furthermore, it can quickly respond to changes in production needs and meet diverse production requirements. At the same time, staff can promptly handle issues such as pipe blockage and wear, effectively shortening mold downtime and improving equipment utilization.

[0018] (3) The two-color plastic product secondary molding injection mold improves the stability of the device during operation by setting the sealing ring and positioning groove, ensuring that the plastic flows and is formed in the cavity according to the predetermined path, ensuring the stability of product quality, and at the same time, it can effectively transmit the pressure applied by the injection molding machine to the cavity, ensuring that the plastic can fully fill all corners of the cavity, avoiding defects such as short shot and material shortage, thereby improving the molding accuracy and quality of the product. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the connection structure between the injection mold and the pouring port of this utility model.

[0020] Figure 2 This is a schematic diagram of the connection structure between the baffle and the sliding column of this utility model.

[0021] Figure 3 This is a schematic diagram of the connection structure between the sealing ring and the positioning groove of this utility model.

[0022] Figure 4 This is a schematic diagram of the connection structure between the fixed pipe and the sealing ring of this utility model.

[0023] Figure 5 This is a schematic diagram of the connection structure between the positioning column and the connecting column of this utility model.

[0024] Figure 6 This is a schematic diagram of the connection structure between the isolation plate and the rotating shaft of this utility model.

[0025] Figure 7 This is a schematic diagram of the connection structure between the torsion spring and the top cover of this utility model.

[0026] In the diagram: 1. Injection mold; 2. Top cover; 3. Pour port; 4. Fixed pipe; 5. Sealing ring; 6. Sliding groove; 7. Fixed spring; 8. Sliding block; 9. Positioning groove; 10. Connecting column; 11. Positioning column; 12. Baffle; 13. Sliding column; 14. Fixed plate; 15. Limiting rod; 16. Push plate; 17. Buffer spring; 18. Rotating shaft; 19. Isolation plate; 20. Handwheel; 21. Torsion spring. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1: The top cover 2, positioning post 11, and sealing ring 5 improve the stability of the device during operation, ensuring that the plastic flows and forms within the cavity along a predetermined path, thus guaranteeing the stability of product quality. Figures 1-2As shown: It includes an injection mold 1 and a fixed pipe 4. An upper cover 2 is fixedly connected to the upper surface of the injection mold 1, and a pouring port 3 is opened inside the upper cover 2. A connecting column 10 is fixedly connected to the upper surface of the upper cover 2 near the pouring port 3. At the same time, a positioning column 11 is fixedly connected to the inner wall of the connecting column 10. The positioning columns 11 are symmetrically distributed about the center of the connecting column 10. A sealing ring 5 is fixedly connected to the lower outer side of the fixed pipe 4, and the fixed pipe 4 is slidably arranged inside the connecting column 10. At the same time, a positioning groove 9 is opened inside the sealing ring 5, and the positioning groove 9 corresponds one-to-one with the positioning column 11. A rotating shaft 18 is set inside the upper cover 2 through a reciprocating rotating assembly, and an isolation plate 19 is fixedly connected to the surface of the rotating shaft 18. The isolation plate 19 is rotatably arranged on the upper cover 2.

[0029] The worker installs the injection mold 1 on the surface of the device and pours the product through the pre-reserved pouring port 3 inside the top cover 2. During pouring, the pouring port 3 at the lower end of the connecting column 10 is closed, ensuring a clear and pure color for the product and preventing unused plastic from entering the mold cavity, thus avoiding mixing of two different colored plastics (e.g., ...). Figure 1 and Figure 6 As shown, when the worker pours the concrete into the pouring port 3 at the lower end of the connecting column 10, the locking structure connects the fixed pipe 4 to the connecting column 10, so that the pouring port 3 at the lower end of the connecting column 10 can be used, thus forming a complete two-color plastic product.

[0030] In Example 2, unlike Example 1, the sliding column 13, limiting rod 15, and fixing plate 14 reduce the adjustment steps during installation and enable the system to withstand the high pressure of the molten plastic in the injection pipe during the injection molding process. Figures 3-5 As shown: A sliding groove 6 is provided inside the sealing ring 5, and one end of a fixing spring 7 is fixedly connected to the surface of the sliding groove 6. A sliding block 8 is fixedly connected to the other end of the fixing spring 7. The sliding block 8 is slidably disposed inside the sealing ring 5, and the sliding blocks 8 are symmetrically distributed about the center of the sealing ring 5. The outer side of the sliding block 8 is inclined near the top cover 2. A baffle 12 is fixedly connected to the outer side of the connecting post 10, and a sliding post 13 is slidably connected inside the baffle 12. A fixing plate 14 is fixedly connected to the surface of the sliding post 13 near the end of the connecting post 10. A limit rod 15 is fixedly connected to the outer side of the connecting post 10, and the limit rod 15 is slidably connected through the fixing plate 14. A buffer spring 17 is fixedly connected to the surface of the fixing plate 14 away from the baffle 12. The other end of the buffer spring 17 is fixedly connected to the connecting post 10. A push plate 16 is fixedly connected to the surface of the sliding post 13 near the end of the connecting post 10, and the push plate 16 is slidably disposed inside the connecting post 10.

[0031] When workers need to pour concrete through the pouring port 3 at the lower end of the connecting column 10, the fixed pipe 4 is connected to the connecting column 10, and the positioning column 11 inside the connecting column 10 slides on the surface of the positioning groove 9 inside the fixed pipe 4. When the fixed pipe 4 contacts the connecting column 10, the connecting column 10 pushes the sliding block 8 outside the sealing ring 5 to slide on the surface of the sliding groove 6, and causes the fixing spring 7 on the surface of the sliding block 8 to retract towards the inner wall of the sealing ring 5. When the fixed pipe 4 and the connecting column 10 are fully fitted, the fixing spring 7 pushes the sliding block 8 to slide inside the connecting column 10, and makes the sliding block 8 tightly fit against the inner wall of the connecting column 10 (e.g., Figure 3 and Figure 4 As shown), when the worker disassembles the fixed pipe 4, the worker presses the sliding column 13, causing the sliding column 13 to slide inside the baffle 12. Under the constraint of the limit rod 15, the buffer spring 17 on the surface of the fixed plate 14 retracts towards the surface of the connecting column 10, thereby causing the push plate 16 on the surface of the sliding column 13 to push the sliding block 8 into the sealing ring 5. When the sliding block 8 is completely inside the sealing ring 5, the worker pulls the fixed pipe 4, thereby separating the fixed pipe 4 from the connecting column 10 (as shown). Figure 5 As shown in the figure, it can quickly respond to changes in production needs and meet diverse production requirements, while staff can promptly handle problems such as pipe blockage and wear.

[0032] In Example 3, unlike Example 2, the use of a handwheel 20, torsion spring 21, and isolation plate 19 ensures the clarity and purity of the product's color while preventing unused plastic from entering the mold cavity. Figures 6-7 As shown: The reciprocating rotating assembly includes a handwheel 20 fixedly connected to the surface of the rotating shaft 18, and the handwheel 20 is rotatably disposed on the outside of the injection mold 1. One end of the torsion spring 21 is fixedly connected to the surface of the top cover 2, and the other end of the torsion spring 21 is fixedly connected to the rotating shaft 18.

[0033] When workers need to pour concrete through another pouring port 3, they turn the handwheel 20, causing the handwheel 20 to drive the internal rotating shaft 18 to rotate inside the upper cover 2 (e.g., Figure 6 (As shown), and causes the torsion spring 21 fixedly connected to the surface of the upper cover 2 to retract towards the surface of the rotating shaft 18. At this time, the rotating shaft 18 drives the isolation plate 19 on its surface to rotate inside the upper cover 2, and opens the other end of the pouring port 3, allowing liquid to flow into the injection mold 1. When the operator does not use the pouring port 3 at the lower end of the connecting column 10, the operator releases the handwheel 20, and the torsion spring 21 drives the rotating shaft 18 to rotate, causing the isolation plate 19 on the surface of the rotating shaft 18 to return to its original position (as shown). Figure 7As shown, the pouring port 3 at the lower end of the connecting column 10 is closed to prevent the two colors of plastic from mixing, ensuring that each plastic performs its expected performance in its respective injection molding process and extending the overall service life of the mold.

[0034] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A two-color plastic product secondary molding injection mold, comprising an injection mold (1) and a fixed pipe (4), wherein an upper cover (2) is fixedly connected to the upper surface of the injection mold (1), and a pouring port (3) is opened inside the upper cover (2), and a connecting column (10) is fixedly connected to one end of the upper surface of the upper cover (2) near the pouring port (3), and a positioning column (11) is fixedly connected to the inner wall of the connecting column (10); Its features are: The positioning columns (11) are symmetrically distributed about the center of the connecting column (10). A sealing ring (5) is fixedly connected to the lower outer side of the fixed pipe (4), and the fixed pipe (4) is slidably disposed inside the connecting column (10). Meanwhile, a positioning groove (9) is opened inside the sealing ring (5). The positioning groove (9) corresponds one-to-one with the positioning column (11). The upper cover (2) is equipped with a rotating shaft (18) through a reciprocating rotating assembly. An isolation plate (19) is fixedly connected to the surface of the rotating shaft (18), and the isolation plate (19) is rotatably mounted on the upper cover (2).

2. The two-color plastic product secondary molding injection mold according to claim 1, characterized in that: The sealing ring (5) has a sliding groove (6) inside, and one end of a fixing spring (7) is fixedly connected to the surface of the sliding groove (6), and the other end of the fixing spring (7) is fixedly connected to a sliding block (8).

3. The two-color plastic product secondary molding injection mold according to claim 2, characterized in that: The sliding block (8) is slidably disposed inside the sealing ring (5), and the sliding block (8) is symmetrically distributed about the center of the sealing ring (5), and the outer side of the sliding block (8) near the top cover (2) is inclined.

4. The two-color plastic product secondary molding injection mold according to claim 3, characterized in that: A baffle (12) is fixedly connected to the outside of the connecting column (10), and a sliding column (13) is slidably connected inside the baffle (12), and a fixing plate (14) is fixedly connected to one end of the sliding column (13) near the connecting column (10).

5. The two-color plastic product secondary molding injection mold according to claim 4, characterized in that: A limiting rod (15) is fixedly connected to the outside of the connecting column (10), and the limiting rod (15) is slidably connected through the fixing plate (14). A buffer spring (17) is fixedly connected to the end of the surface of the fixing plate (14) away from the baffle (12).

6. The two-color plastic product secondary molding injection mold according to claim 5, characterized in that: The other end of the buffer spring (17) is fixedly connected to the connecting post (10), and the surface of the sliding post (13) is fixedly connected to one end of the connecting post (10), and the push plate (16) is slidably disposed inside the connecting post (10).

7. The two-color plastic product secondary molding injection mold according to claim 1, characterized in that: The reciprocating rotation assembly includes a handwheel (20) fixedly connected to the surface of the rotating shaft (18), and the handwheel (20) is rotatably disposed on the outside of the injection mold (1). One end of a torsion spring (21) is fixedly connected to the surface of the top cover (2), and the other end of the torsion spring (21) is fixedly connected to the rotating shaft (18).

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