A two-color injection molding machine hot stamping mold for soft and hard rubber.

Abstract

This utility model belongs to the field of mold technology, and in particular to a hot-pressing mold for soft and hard plastics in a two-color injection molding machine. It includes a mold base, a turntable movably mounted above the mold base, a fixed mold frame fixed above the turntable, a first mold cavity and a second mold cavity respectively opened on both sides of the fixed mold frame, and a moving mold frame above the fixed mold frame. Lifting base plates are slidably mounted on the bottom of both the first and second mold cavities, and telescopic push rods are fixed below the lifting base plates. Cooling pipes are fixedly mounted on both sides inside the moving mold frame, and one end of each cooling pipe is connected to a liquid storage tank. Through the first and second mold cavities, the same mold can freely switch between two production modes. The turntable rotation switches between two workstations, allowing a single machine to complete the injection molding process. This solves the problem of idle two-color machines or overcapacity of single-color machines, improves equipment scheduling flexibility, and prevents inefficient production processes caused by relying solely on a two-color injection molding machine or two single-color machines working together.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a hot-pressing soft and hard rubber mold for a two-color injection molding machine. Background Technology

[0002] Two-color injection molding machine is an injection molding equipment used to produce plastic products of two different colors or materials. Two-color injection molding technology is widely used in various product manufacturing fields, bringing diverse visual effects and functions to products. The hot-press soft and hard plastic mold of the two-color injection molding machine refers to a mold in which two plastic materials are injected one after the other on the same injection molding machine, and the product is molded in two stages, but the product is only ejected from the mold once.

[0003] In existing technologies, mold production typically relies on a single two-color injection molding machine or two single-color machines working together. Two-color machines are expensive and have a high idle rate, while single-color machines require manual transfer of semi-finished products, which is time-consuming and labor-intensive, and the handling process can easily cause scratches or contamination of the products. In conventional cold injection molding processes, when the hard plastic matrix is ​​cooled and then the soft plastic is injected again, the temperature difference at the interface leads to insufficient molecular penetration, reduced adhesion, and delamination defects. Therefore, we propose a hot injection molding mold for hard and soft plastics using a two-color injection molding machine. Utility Model Content

[0004] To address the issues raised in the background section regarding existing technologies where molds typically rely on a single two-color injection molding machine or two single-color machines in collaborative production, which are expensive and have high idle rates, while single-color machines require manual transfer of semi-finished products, which is time-consuming, labor-intensive, and prone to scratching or contamination during handling, and in conventional cold-pressing processes where the interface temperature difference leads to insufficient molecular penetration and reduced adhesion during the secondary injection of soft plastic after the hard plastic substrate has cooled, resulting in delamination defects, this invention provides a hot-pressing mold for both hard and soft plastics using a two-color injection molding machine.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hot-pressed soft and hard plastic mold for a two-color injection molding machine, comprising a mold base, a turntable movably mounted above the mold base, a fixed mold frame fixed above the turntable, a first mold cavity and a second mold cavity respectively opened on both sides of the fixed mold frame, a movable mold frame arranged above the fixed mold frame, a lifting base plate slidably mounted at the bottom of both the first mold cavity and the second mold cavity, and a telescopic push rod fixed below the lifting base plate;

[0006] Cooling pipes are fixedly installed on both sides inside the moving mold frame. One end of the cooling pipe is connected to a liquid storage tank, and the other end of the cooling pipe is connected to a return pipe. Pumps are installed on both the return pipe and the liquid storage tank.

[0007] As a preferred embodiment of the hot-pressing soft and hard plastic mold for a two-color injection molding machine according to this utility model, lifting hydraulic rods are installed on both sides of the moving mold frame, and the lifting hydraulic rods and the moving mold frame form a telescopic structure.

[0008] As a preferred embodiment of the hot-pressed soft and hard plastic mold for a two-color injection molding machine according to this utility model, injection ports are fixed on both sides above the moving mold frame, and injection channels are connected below the injection ports, with the injection channels corresponding to the positions of the first mold cavity and the second mold cavity respectively.

[0009] As a preferred embodiment of the hot-pressing soft and hard plastic mold for a two-color injection molding machine according to this utility model, a servo motor is fixedly connected to the middle part below the turntable, and the servo motor forms a rotation structure between the turntable and the fixed mold frame.

[0010] As a preferred embodiment of the hot-pressed soft and hard plastic mold for a two-color injection molding machine according to this utility model, the liquid storage tank is connected to the cooling pipe through the pump body and the pipe, and the cooling pipe is tightly fitted to the first mold cavity and the second mold cavity respectively.

[0011] In a preferred embodiment of the hot-pressed soft and hard plastic mold for a two-color injection molding machine according to this utility model, the return pipe is connected to the liquid storage tank through a pump body.

[0012] As a preferred embodiment of the hot-pressed soft and hard plastic mold for a two-color injection molding machine according to this utility model, the telescopic push rod and the lifting base plate form a telescopic structure, and the lifting base plate is matched with the dimensions of the first mold cavity and the second mold cavity respectively.

[0013] Compared with the prior art, the beneficial effects of this utility model are: through the first mold cavity and the second mold cavity, the same mold can freely switch between two production modes, the turntable rotates to switch between two workstations, and a single machine completes injection molding, solving the problem of idle two-color machines or overcapacity of single-color machines, improving the flexibility of equipment scheduling, and preventing the problem of inefficient production process caused by relying solely on two-color injection molding machines or two single-color machines for collaborative production.

[0014] This application achieves rapid curing by rapidly circulating coolant during the hard plastic stage, keeping the mold cavity temperature ≤40℃. During the soft plastic stage, the cooling flow rate is reduced to maintain a high mold cavity temperature of 180-220℃±1℃, thus extending the molten state time of the soft plastic. This prevents the problem of insufficient molecular penetration and reduced adhesion caused by the interface temperature difference during the secondary injection molding of soft plastic after the hard plastic matrix has cooled, which is common in conventional cold injection molding processes. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the external structure of this utility model;

[0018] Figure 3 This is a top view of the fixed mold frame in this utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the mold base in this utility model.

[0020] In the diagram: 1. Mold base; 2. Fixed mold frame; 3. Moving mold frame; 4. Injection port; 5. Injection channel; 6. Lifting hydraulic rod; 7. First mold cavity; 8. Second mold cavity; 9. Liquid storage tank; 10. Pump body; 11. Cooling pipe; 12. Return pipe; 13. Lifting base plate; 14. Telescopic push rod; 15. Turntable; 16. Servo motor. Detailed Implementation

[0021] 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. Example 1

[0022] like Figures 1-4 As shown;

[0023] A two-color injection molding machine hot-pressed soft and hard plastic mold includes a mold base 1, a turntable 15 movably mounted above the mold base 1, a fixed mold frame 2 fixed above the turntable 15, a first mold cavity 7 and a second mold cavity 8 respectively opened on both sides of the fixed mold frame 2, a movable mold frame 3 arranged above the fixed mold frame 2, a lifting base plate 13 slidably mounted on the bottom of both the first mold cavity 7 and the second mold cavity 8, and a telescopic push rod 14 fixed below the lifting base plate 13; cooling pipes 11 are fixedly installed on both sides inside the movable mold frame 3, one end of the cooling pipe 11 is connected to a liquid storage tank 9, the other end of the cooling pipe 11 is connected to a return pipe 12, and a pump body 10 is installed on both the return pipe 12 and the liquid storage tank 9.

[0024] In this implementation plan: the first mold cavity 7 and the second mold cavity 8 enable the same mold to freely switch between two production modes. The turntable 15 rotates to switch between two workstations, and a single machine completes the engraving process, solving the problem of idle two-color machines or overcapacity of single-color machines. The flexibility of equipment scheduling is improved. In the hard rubber stage, the coolant circulates at high speed, and the mold cavity temperature is ≤40℃, achieving rapid curing. In the soft rubber stage, the cooling flow rate is reduced to maintain a high temperature of 180-220℃±1℃ in the mold cavity, extending the melting time of the soft rubber.

[0025] Furthermore:

[0026] In an optional embodiment, lifting hydraulic rods 6 are installed on both sides of the moving mold frame 3, and the lifting hydraulic rods 6 and the moving mold frame 3 form a telescopic structure.

[0027] In this implementation scheme: the moving mold frame 3 can be closed with the fixed mold frame 2 under the drive of the lifting hydraulic rod 6.

[0028] Furthermore:

[0029] In an optional embodiment, injection ports 4 are fixed on both sides above the moving mold frame 3, and injection channels 5 are connected below the injection ports 4. The injection channels 5 correspond to the positions of the first mold cavity 7 and the second mold cavity 8, respectively.

[0030] In this implementation scheme: the molten adhesive can enter the mold cavity through the injection port 4 to the injection channel 5 and then be injection molded.

[0031] Furthermore:

[0032] In an optional embodiment, a servo motor 16 is fixedly connected to the center below the turntable 15, and the servo motor 16 forms a rotating structure between the turntable 15 and the fixed mold frame 2.

[0033] In this implementation scheme: the servo motor 16 drives the turntable 15 to rotate 180°, moving the first mold cavity 7 of the fixed mold frame 2 to the second injection station, while the second mold cavity 8 moves to the first station.

[0034] Furthermore:

[0035] In an optional embodiment, the liquid storage tank 9 is connected to the cooling pipe 11 via the pump body 10 and the pipe, and the cooling pipe 11 is tightly fitted to the first mold cavity 7 and the second mold cavity 8 respectively.

[0036] In this implementation scheme, the combination of the liquid storage tank 9, the pump body 10, and the cooling pipe 11 enables rapid cooling circulation, allowing the hard adhesive to cure quickly.

[0037] Furthermore:

[0038] In an optional embodiment, the return pipe 12 is interconnected with the storage tank 9 via the pump body 10.

[0039] In this implementation scheme: the return pipe 12 facilitates the recovery of cooling liquid and promotes cooling circulation.

[0040] Furthermore:

[0041] In an optional embodiment, the telescopic push rod 14 and the lifting base plate 13 form a telescopic structure, and the lifting base plate 13 is matched with the dimensions of the first mold cavity 7 and the second mold cavity 8 respectively.

[0042] In this implementation plan: the telescopic push rod 14 pushes the lifting base plate 13 upward, ejecting the finished product out of the second mold cavity 8.

[0043] Working principle: First, the first color of hard plastic is injected. Release fluid is applied to the mold frame, and simultaneously, two identical lifting hydraulic rods 6 are activated. These lifting hydraulic rods 6 are existing technology products, model YLK11. The two lifting hydraulic rods 6 distribute the oil flow through a throttling orifice in the valve, forcing the two cylinders to synchronize in both directions. A hydraulically controlled check valve is also used to prevent uneven load causing axial movement. After the moving mold frame 3 closes under the drive of the lifting hydraulic rods 6, the molten hard plastic is injected through the injection port 4 into the left injection channel 5, and then through the injection channel 5 into the first mold cavity 7 for injection molding. After molding, the pump body 10 is activated. The pump body 10 draws coolant from the corresponding side's reservoir 9 and injects it through a pipe into the cooling pipe 11, then through the return pipe 12 back into the reservoir 9. Inside, a rapid cooling cycle is performed; then the servo motor 16 is started, driving the turntable 15 to rotate 180°, moving the first mold cavity 7 of the fixed mold frame 2 to the second injection station, while the second mold cavity 8 moves to the first station, and then hot-pressing of the second color soft rubber is performed. The moving mold frame 3 closes again, and the soft rubber is injected into the second mold cavity 8 through another injection port 4, covering the hard rubber substrate. Then hot water is injected into the liquid storage tank 9, and the cooling pipe 11 is switched to the heat preservation mode to maintain the mold cavity temperature in the viscous flow range of the soft rubber, promoting the mutual fusion of soft and hard rubber molecules; finally, the telescopic push rod 14 is started. The telescopic push rod 14 is an electric telescopic rod in the prior art, model YLK1, which pushes the lifting base plate 13 to move upward, ejecting the finished product out of the second mold cavity 8, and the part can be directly removed.

[0044] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A two-color injection molding machine hot beer soft and hard rubber mold, comprising a mold base (1), characterized in that: A turntable (15) is movably installed above the mold base (1). A fixed mold frame (2) is fixed above the turntable (15). A first mold cavity (7) and a second mold cavity (8) are respectively opened on both sides of the fixed mold frame (2). A movable mold frame (3) is provided above the fixed mold frame (2). A lifting base plate (13) is slidably installed at the bottom of the first mold cavity (7) and the second mold cavity (8). A telescopic push rod (14) is fixed below the lifting base plate (13). Cooling pipes (11) are fixedly installed on both sides inside the moving mold frame (3). One end of the cooling pipe (11) is connected to a liquid storage tank (9), and the other end of the cooling pipe (11) is connected to a return pipe (12). Pump bodies (10) are installed on both the return pipe (12) and the liquid storage tank (9).

2. The hot beer soft and hard rubber mold of claim 1, wherein: Lifting hydraulic rods (6) are installed on both sides of the moving mold frame (3), and the lifting hydraulic rods (6) and the moving mold frame (3) form a telescopic structure.

3. The hot beer soft and hard rubber mold of claim 1, wherein: Injection ports (4) are fixed on both sides above the moving mold frame (3). An injection channel (5) is connected below the injection port (4). The injection channel (5) corresponds to the positions of the first mold cavity (7) and the second mold cavity (8), respectively.

4. The hot beer soft and hard rubber mold of claim 1, wherein: A servo motor (16) is fixedly connected to the middle part below the turntable (15), and the servo motor (16) forms a rotating structure between the turntable (15) and the fixed mold frame (2).

5. The hot beer soft and hard rubber mold of claim 1, wherein: The liquid storage tank (9) is connected to the cooling pipe (11) through the pump body (10) and the pipe. The cooling pipe (11) is tightly fitted to the first mold cavity (7) and the second mold cavity (8) respectively.

6. The hot beer soft and hard rubber mold of claim 1, wherein: The return pipe (12) is connected to the liquid storage tank (9) through the pump body (10).

7. The hot beer soft and hard rubber mold of claim 1, wherein: The telescopic push rod (14) and the lifting base plate (13) form a telescopic structure, and the lifting base plate (13) is matched with the size of the first mold cavity (7) and the second mold cavity (8) respectively.

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