Multi-color injection mold runner switching mechanism

Abstract

The utility model belongs to the technical field of multi-color injection molds, in particular to a runner switching mechanism of a multi-color injection mold, and aims to solve the problem that a product ejection structure provided by the background technology is complicated, the runner switching mechanism comprises a turntable, and multi-color runner molds which are distributed at equal intervals are fixedly connected to the outer wall of the turntable through screws; a product ejection bin is arranged in the multi-color runner mold, springs distributed in an array mode are fixedly connected to the inner wall of one side of the product ejection bin, and a transverse moving plate is fixedly connected to the outer wall of one end of each spring. According to the utility model, the multi-color runner mold is integrated through the turntable, and the linkage design that a single cylinder drives a plurality of groups of ejector pins is adopted, so that the number of ejection structures is greatly reduced. Each set of runner in a traditional mold needs to be independently provided with an ejection system, while the integration of the multi-runner ejection mechanism is realized through the mutual matching of the shared transverse moving plate, the spring and the push rod, and the material cost and the processing complexity are obviously reduced.

Description

Technical Field

[0001] This utility model relates to the field of multi-color injection mold technology, and in particular to a multi-color injection mold flow channel switching mechanism. Background Technology

[0002] Multi-color injection molds are specialized molds capable of molding multiple colors or materials within a single molding cycle. They are widely used in the production of plastic products requiring complex colors or functional zones, such as automotive parts, electronic device housings, and daily necessities. The core principle involves injecting molten plastic of different colors sequentially or simultaneously into the mold cavity through a runner switching mechanism, thereby achieving the molding of multi-color or composite materials. This mold technology significantly enhances the diversity of product appearance and functional integration, while reducing the processes and costs associated with traditional multi-mold production, making it an important development direction for the modern injection molding industry.

[0003] However, existing multi-color injection molds still have some shortcomings. First, traditional designs typically require separate ejection structures for each color or material, such as ejector pins, push plates, and drive devices. This not only complicates the internal structure of the mold and increases the difficulty of installation and debugging, but also significantly increases manufacturing costs. Second, the coexistence of multiple ejection mechanisms can easily cause motion interference, affecting the synchronization and stability of the ejection action, which in turn leads to poor product demolding or surface damage. Summary of the Invention

[0004] In view of the shortcomings of the prior art, this utility model provides a multi-color injection mold flow channel switching mechanism, which overcomes the shortcomings of the prior art and effectively solves the problem of complex product ejection structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A multi-color injection mold runner switching mechanism includes a turntable. A multi-color runner mold with equidistantly distributed runners is fixedly connected to the outer wall of the turntable by screws. The multi-color runner mold has a product ejection chamber inside, and an array of springs is fixedly connected to the inner wall of one side of the product ejection chamber. A transverse plate is fixedly connected to the outer wall of one end of each spring, and an array of ejector pins with equidistantly distributed runners is welded to the outer wall of one side of the transverse plate. The springs and ejector pins are located on opposite sides of the transverse plate. Angle brackets are fixedly connected to the top and bottom inner walls of the product ejection chamber by screws, and the transverse plate is tightly attached to the outer wall of the angle brackets.

[0007] Preferably, a cylinder is provided on one side of the turntable, and the piston rod of the cylinder is fixedly connected to a connecting plate. A push rod is fixedly connected to the outer wall of one side of the connecting plate, and the push rod is located on the other side of the transverse plate.

[0008] Preferably, a positioning hole is provided on one side of the outer wall of the multi-color flow channel mold, and the size of the positioning hole is adapted to the size of the push rod.

[0009] Preferably, the outer wall of the multi-color flow channel mold is provided with a product forming area, and the inner wall of the product forming area is provided with a product ejection hole, and the ejector pin is slidably connected to the inner wall of the product ejection hole.

[0010] Preferably, the upper and lower ends of the outer wall of the other side of the multi-color flow channel mold are provided with guide holes for docking with the moving mold.

[0011] Preferably, a housing is provided on one side of the multi-color flow channel mold, and a stepper motor is installed inside the housing. The output shaft of the stepper motor is fixedly connected to a main shaft through a coupling, and one end of the main shaft is fixedly connected to the center of the outer wall of the turntable.

[0012] Preferably, a U-shaped frame is fixedly connected to one side of the outer wall of the chassis by screws, and the main shaft is rotatably connected to the inner wall of the U-shaped frame by bearings, and the cylinder is fixedly connected to the top outer wall of the U-shaped frame by screws.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. The multi-color injection mold runner switching mechanism designed in this paper integrates the multi-color runner mold through a turntable and adopts a linkage design of multiple sets of ejector pins driven by a single cylinder, which greatly reduces the number of ejection structures. In traditional molds, each runner requires a separate ejection system, while this utility model achieves the integration of the multi-runner ejection mechanism through the cooperation of a shared transverse plate, spring and push rod, which significantly reduces material costs and processing complexity;

[0015] 2. The multi-color injection mold runner switching mechanism in this design features symmetrically distributed push rods that drive the transverse plate via cylinders. This allows the ejector pins to eject synchronously under the spring reset action. The precise fit between the product ejection hole and the ejector pins ensures that there is no deviation during the ejection process, improving the product demolding success rate. In addition, the corner brackets effectively limit the transverse plate to prevent the ejector pins from overtraveling, extending the service life of the mold and the maintenance cycle. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the multi-color injection mold flow channel switching mechanism proposed in this utility model. Figure 1 ;

[0017] Figure 2 This is a three-dimensional schematic diagram of the overall structure of the multi-color injection mold flow channel switching mechanism proposed in this utility model. Figure 2 ;

[0018] Figure 3 This is a side view of the overall structure of the multi-color injection mold flow channel switching mechanism proposed in this utility model;

[0019] Figure 4This is a schematic diagram of the multi-color injection mold flow channel switching mechanism proposed in this utility model when the product is about to be ejected.

[0020] Figure 5 This is a cross-sectional view of the multi-color injection mold flow channel switching mechanism proposed in this utility model.

[0021] In the diagram: 1. Turntable; 2. Multi-color runner mold; 3. Spring; 4. Transverse plate; 5. Ejector pin; 6. Corner bracket; 7. Cylinder; 8. Connecting plate; 9. Push rod; 10. Positioning hole; 11. Product forming area; 12. Guide hole; 13. Chassis; 14. Spindle; 15. U-shaped frame; 16. Product ejection chamber; 17. Product ejection hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figures 1-5 Example 1: A multi-color injection mold runner switching mechanism includes a turntable 1. A multi-color runner mold 2 with equidistant distributions is fixedly connected to the outer wall of the turntable 1 by screws. A product ejection chamber 16 is provided inside the multi-color runner mold 2. An array of springs 3 is fixedly connected to the inner wall of one side of the product ejection chamber 16. A transverse plate 4 is fixedly connected to the outer wall of one end of the springs 3. An array of ejector pins 5 with equidistant distributions is welded to the outer wall of one side of the transverse plate 4. The springs 3 and ejector pins 5 are located on both sides of the transverse plate 4. Angle brackets 6 are fixedly connected to the top and bottom inner walls of the product ejection chamber 16 by screws. The transverse plate 4 is tightly attached to the outer wall of the angle brackets 6.

[0024] The multi-color flow channel mold 2 has a product forming area 11 on the outer wall of the other side, and a product ejection hole 17 is provided on the inner wall of the product forming area 11. The ejector pin 5 is slidably connected to the inner wall of the product ejection hole 17.

[0025] In this embodiment, the product forming area 11 is located on the other side of the multi-color runner mold 2. Molten plastic is injected into the cavity through the multi-color runner mold 2 and then cooled and formed. During the ejection stage, the cylinder 7 drives the push rod 9 to push the transverse plate 4, and the ejector pin 5 pushes the finished product out along the product ejection hole 17. After ejection, the spring 3 automatically resets the transverse plate 4 to prepare for the next cycle.

[0026] Example 2: A multi-color injection mold runner switching mechanism. A cylinder 7 is installed on one side of the turntable 1, and the piston rod of the cylinder 7 is fixedly connected to a connecting plate 8. Symmetrically distributed push rods 9 are fixedly connected to the outer wall of one side of the connecting plate 8, and the push rods 9 are located on the other side of the transverse plate 4. A positioning hole 10 is provided on the outer wall of one side of the multi-color runner mold 2, and the size of the positioning hole 10 is adapted to the size of the push rod 9.

[0027] In this embodiment, when the cylinder 7 is activated, the push rod 9 pushes the transverse plate 4 to move laterally against the resistance of the spring 3, causing the ejector pin 5 to extend from the product ejection hole 17, completing the product ejection. The positioning hole 10 on the side wall of the multi-color runner mold 2 is adapted to the size of the push rod 9, ensuring that the push rod 9 is accurately aligned during the ejection process and avoiding misalignment. In addition, during actual operation, the guide hole 12 on the other side of the multi-color runner mold 2 can cooperate with the guide post of the moving mold to achieve rapid positioning when the mold closes.

[0028] The upper and lower ends of the outer wall of the multi-color flow channel mold 2 are provided with guide holes 12 for docking with the moving mold.

[0029] A housing 13 is provided on one side of the multi-color flow channel mold 2, and a stepper motor is installed inside the housing 13. The output shaft of the stepper motor is fixedly connected to a main shaft 14 via a coupling. One end of the main shaft 14 is fixedly connected to the center of the outer wall of the turntable 1. A U-shaped frame 15 is fixedly connected to the outer wall of one side of the housing 13 by screws, and the main shaft 14 is rotatably connected to the inner wall of the U-shaped frame 15 via bearings. The cylinder 7 is fixedly connected to the top outer wall of the U-shaped frame 15 by screws.

[0030] Turntable 1 is connected to a stepper motor inside the housing 13 via a spindle 14. The stepper motor drives turntable 1 to rotate at a preset angle, achieving the switching of different color flow channels. Ejector pin 5 slides into the product ejection hole 17. The corner brackets 6 at the top and bottom of the product ejection chamber 16 are fixed with screws. The transverse plate 4 is close to the outer wall of the corner bracket 6, ensuring that the end of ejector pin 5 near the product forming area 11 is flush with the product forming area 11, ensuring a smooth surface after product demolding.

[0031] Working principle:

[0032] During the flow channel switching stage: The stepper motor drives the spindle 14 to rotate, which in turn rotates the turntable 1 and the multi-color flow channel mold 2 to the target station. The guide hole 12 aligns with the guide post of the moving mold to ensure rapid positioning when the mold closes.

[0033] Injection molding stage: Molten plastic is injected into the cavity of the product molding area 11 through the current runner. After cooling and solidification, it forms a semi-finished product. After switching between multiple multi-color runner molds 2, the final product is formed.

[0034] Ejection stage: The piston rod of cylinder 7 extends and pushes push rod 9 to move laterally through connecting plate 8. Push rod 9 acts on transverse plate 4, overcoming the resistance of spring 3, so that ejector pin 5 ejects the finished product along product ejection hole 17.

[0035] Reset and Cyclic Phase: After the product is ejected, the piston rod of cylinder 7 retracts, spring 3 pushes the transverse plate 4 to reset, and ejector pin 5 retracts into the product ejection chamber 16. Angle bracket 6 limits the displacement range of transverse plate 4 to prevent ejector pin 5 from overtraveling. Turntable 1 drives multi-color runner mold 2 to continue rotating to the next station, repeating the above process to achieve continuous production of multi-color injection molding.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. Multi-color injection mold runner switching mechanism comprising a carousel (1), characterized in that, The outer wall of the turntable (1) is fixedly connected with a multi-color flow channel mold (2) with equal spacing by screws. The multi-color flow channel mold (2) is provided with a product ejection chamber (16) inside. The inner wall of one side of the product ejection chamber (16) is fixedly connected with an array of springs (3). The outer wall of one end of the spring (3) is fixedly connected with a transverse plate (4). The outer wall of one side of the transverse plate (4) is welded with an array of ejector pins (5) with equal spacing. The springs (3) and ejector pins (5) are located on both sides of the transverse plate (4). The top and bottom inner walls of the product ejection chamber (16) are fixedly connected with corner brackets (6) by screws. The transverse plate (4) is tightly attached to the outer wall of the corner brackets (6).

2. The multicolor injection mold manifold switching mechanism of claim 1, wherein, A cylinder (7) is provided on one side of the turntable (1), and the piston rod of the cylinder (7) is fixedly connected to a connecting plate (8). A push rod (9) is fixedly connected to the outer wall of one side of the connecting plate (8), and the push rod (9) is located on the other side of the transverse plate (4).

3. The multicolor injection mold gate switching mechanism of claim 1, wherein, The multi-color flow channel mold (2) has a positioning hole (10) on one side of its outer wall, and the size of the positioning hole (10) is compatible with the size of the push rod (9).

4. The multicolor injection mold gate switching mechanism of claim 1, wherein, The multi-color flow channel mold (2) has a product forming area (11) on the outer wall of the other side, and a product ejection hole (17) is provided on the inner wall of the product forming area (11), and the ejector pin (5) is slidably connected to the inner wall of the product ejection hole (17).

5. The multicolor injection mold gate switching mechanism of claim 1, wherein, The multi-color flow channel mold (2) has guide holes (12) at both the upper and lower ends of the outer wall on the other side for docking with the moving mold.

6. The multicolor injection mold gate switching mechanism of claim 1, wherein, The multi-color flow channel mold (2) is provided with a housing (13) on one side, and a stepper motor is installed inside the housing (13). The output shaft of the stepper motor is fixedly connected to the main shaft (14) through a coupling. One end of the main shaft (14) is fixedly connected to the center of the outer wall of the turntable (1).

7. The multicolor injection mold gate switching mechanism of claim 6, wherein, A U-shaped frame (15) is fixedly connected to one side of the outer wall of the chassis (13) by screws, and the main shaft (14) is rotatably connected to the inner wall of the U-shaped frame (15) by bearings. The cylinder (7) is fixedly connected to the top outer wall of the U-shaped frame (15) by screws.

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