Double-injection injection mold

Abstract

A driving motor and a worm reduction box are arranged on the surface of the injection mold, injection cabins are symmetrically installed on the two sides of the worm reduction box, a rotor is eccentrically and rotationally installed in each injection cabin, a plurality of sliding grooves are formed in the surfaces of the rotors, sliding pieces are installed in the sliding grooves in a sliding mode, and elastic pieces are further arranged on the inner sides of the sliding grooves. And an extrusion pressurization structure similar to a sliding vane pump is formed during rotation. The driving motor and the worm speed reduction box jointly output large torque, the rotating speed and the flow of the two material flows are kept consistent through the synchronizing shaft, and high efficiency and high consistency of the double-injection process are achieved. Anti-sticking coatings are arranged on the surfaces of the rotor and the slip sheet and the inner wall of the injection cabin, so that material adhesion can be reduced, and subsequent cleaning is facilitated. According to the structure, the injection molding pressure and the production efficiency are remarkably improved while the requirement for double-color or multi-material lamination molding is met, and the structure has the advantages of being easy and convenient to operate, stable in structure, low in maintenance cost and the like and is suitable for the industrial production field with high requirements for synchronism and high-pressure injection molding performance.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically a double-shot injection mold. Background Technology

[0002] With the widespread use of plastic products in industrial manufacturing and daily life, injection molding technology has been continuously upgraded, resulting in a variety of injection molding methods to meet different product requirements. Two-shot injection molding (also known as two-color injection molding or two-material injection molding) is an important process that allows two different colors or materials of plastic to be injected sequentially into the same mold to produce products with complex structures, diverse appearances, or complementary functions.

[0003] Existing dual-injection molding processes typically employ two independent injection systems to supply material to two separate injection units. While this enables injection molding of multiple materials or colors, there is still room for improvement in terms of synchronization, pressure stability, and process simplification. For example, how to synchronize two material flows under the same drive mechanism, how to achieve reliable material delivery in high-viscosity or high-pressure scenarios, and how to reduce material adhesion for easier subsequent cleaning are all technical challenges that the industry urgently needs to address.

[0004] Based on the above problems, this utility model proposes a dual-injection mold design. By setting a drive motor and a worm gear reducer on the surface of the injection mold and symmetrically arranging two injection chambers, each injection chamber adopts a rotor and vanes with a structure similar to a vane pump. While maintaining the synchronous movement of the two material streams, it can achieve pressurization and efficient conveying of the material streams. Furthermore, by setting an anti-stick coating on key parts, it reduces cleaning difficulty and downtime. It has significant practical value and promotion significance. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-injection mold that achieves synchronous injection and pressurized conveying of two material streams by employing two symmetrically arranged injection chambers within the same mold system and utilizing the synergistic effect of a drive motor and a worm gear reducer. This design not only meets the high consistency requirements for molding two-color or multi-material products, but also effectively improves conveying efficiency and injection pressure through a vane pump rotor structure. Furthermore, the application of anti-stick coatings to key components such as the rotor, vanes, and the inner walls of the injection chambers facilitates subsequent cleaning and maintenance, significantly improving the efficiency and economy of the production process.

[0006] Traditional two-shot injection molding relies on two or more independent injection molding machines operating in stages or in parallel. While it can mold two-color or multi-material products, it still has significant limitations in terms of synchronous control, floor space, maintenance costs, and material waste. Furthermore, when encountering conditions requiring high viscosity or high injection pressure, traditional solutions often require the addition of external pressure boosting mechanisms, resulting in complex structures and insufficient reliability. Therefore, this invention proposes improvements in the following aspects:

[0007] Symmetrical dual-cabin design

[0008] A worm gear reducer and a drive motor are installed on the surface of the injection mold, with injection chambers symmetrically mounted on both sides of the worm gear reducer. Each injection chamber contains an eccentrically rotating rotor with several grooves, each containing sliding vanes. Because both injection chambers are powered by the same drive mechanism (motor and reducer) and maintain the same rotational speed via a synchronous shaft, the two material flows achieve a high degree of consistency in flow rate and speed. For products requiring two-color or two-material laminated molding, this dual-chamber structure significantly improves the consistency of the product's appearance and performance.

[0009] Vane pump booster principle

[0010] The rotor is eccentrically arranged relative to the axis of the injection chamber. Sliding vanes, mounted in grooves on the rotor surface, remain in contact with the inner wall of the injection chamber under the continuous thrust of the elastic element. As the rotor rotates, the vanes form several independent working chambers around the rotor axis within the injection chamber. These working chambers draw in material near the feed inlet and expel it near the injection port, thus creating a reciprocating pressurization effect similar to a vane pump. Compared to traditional rotors without vanes, this invention achieves higher output pressure and conveying efficiency within the same external dimensions, making it particularly suitable for injection molding high-viscosity plastics or those requiring higher injection pressure.

[0011] Drive and Synchronization

[0012] The drive motor outputs a large torque through a worm gear reducer to rotate the rotor. The worm gear reducer structure allows for a significant increase in output torque while reducing motor speed, fully meeting the needs of various high-load injection molding conditions. The output end of the worm gear reducer connects the two rotors via a synchronous shaft, ensuring consistency in rotational speed and torque transmission between the two injection chambers, thus achieving synchronous material flow between the two streams. This design avoids the problems common in traditional dual-injection systems, such as independent control of multiple motors, large synchronization errors, or high failure rates on one side, further improving the overall reliability of the system.

[0013] Anti-stick coating and maintenance

[0014] Considering that plastics readily adhere to metal surfaces when heated and molten, especially under high temperatures, high viscosity, and long downtime, they are prone to scale buildup or residue. This invention incorporates an anti-stick coating on the surfaces of the rotor and vanes, as well as the inner wall of the injection chamber. This significantly reduces material residue, decreases the frequency of disassembly and cleaning, and effectively lowers component wear. During production material changes or downtime maintenance, operators can easily disassemble, clean, or replace parts within the injection chamber, significantly shortening downtime and reducing subsequent maintenance costs.

[0015] Scope of application and application prospects

[0016] This invention is applicable to two-color molding or multi-material laminated molding scenarios, and is especially suitable for plastic products with high requirements for injection pressure and flow uniformity, such as automotive interior parts, household appliance housings, electronic product housings, and some multifunctional plastic components. Due to its outstanding advantages in synchronous control, pressurization capacity, and ease of cleaning, it can play a significant role in high-end precision products and mass production.

[0017] Through the aforementioned technical layout, this invention achieves synchronous control and efficient pressurization of dual material flows, significantly improving the molding quality of multi-material or multi-color products. Furthermore, it features targeted optimizations in structural design and anti-stick coating, reducing the difficulty of daily equipment maintenance and downtime losses. Compared to existing technologies, this invention represents a breakthrough in synchronization, pressurization capacity, ease of cleaning and maintenance, and production efficiency, providing a simple, efficient, and reliable dual-injection molding solution for the modern injection molding industry, with broad application and promotion value. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0019] Figure 2 This is an exploded structural diagram of one embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal structure of the injection chamber according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the rotor and vane structure according to an embodiment of the present invention.

[0022] Figure label:

[0023] 100. Injection mold; 110. Drive motor; 120. Worm gear reducer; 121. Synchronous shaft; 200. Injection chamber; 210. Feed port; 220. Injection nozzle; 300. Rotor; 310. Sliding vane; 301. Slide groove; 302. Elastic component. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0025] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0026] The following is in conjunction with the appendix Figures 1-4 This invention describes a dual-shot injection mold provided by some embodiments of the present invention.

[0027] Overall structure:

[0028] The dual-injection mold of this embodiment includes an injection mold 100, on which a drive motor 110 and a worm gear reducer 120 are disposed. Two injection chambers 200 are symmetrically installed on both sides of the worm gear reducer 120. Each injection chamber 200 is connected to the injection mold 100 or the worktable surface through a suitable fixing structure to ensure good stability and coaxiality during high-speed injection.

[0029] Injection chamber and rotor vane structure:

[0030] Each injection chamber 200 has an eccentrically mounted rotor 300 inside. Several grooves 301 are circumferentially distributed on the outer surface of the rotor 300, and a sliding vane 310 is slidably mounted in each groove 301. An elastic element 302 is also provided on the inner side of the groove 301; in this embodiment, a spring is preferred, but rubber or other elastic elements can also be used. The eccentric structure between the rotor 300 and the injection chamber 200 ensures that when the rotor 300 rotates, the sliding vane 310 remains in contact with the inner wall of the injection chamber 200 under the thrust of the elastic element 302, forming a dynamic sealing structure similar to a vane pump, thereby squeezing and conveying the material and producing a pressurization effect.

[0031] Inlet and injection port:

[0032] The injection chamber 200 has a feed inlet 210 at the top and an injection port 220 at the bottom. After the material enters the injection chamber 200 through the feed inlet 210, it is squeezed and pushed by the rotation of the rotor 300 and the sliding vane 310, and finally discharged from the injection port 220 into the subsequent mold cavity or pipeline system. In this way, the two injection chambers 200 can realize the simultaneous entry of two material streams into the mold or injection system.

[0033] Drive and Synchronization:

[0034] The drive motor 110 outputs a large torque through the worm gear reducer 120, driving the rotor 300 to rotate, meeting the injection molding requirements of high-viscosity or high-load materials. The output end of the worm gear reducer 120 is connected to the rotor 300 through a synchronous shaft 121, thereby maintaining the synchronous rotation of the two rotors 300 and ensuring that the two material flows obtain the same speed and flow rate, which is suitable for the process requirements of dual-injection or multi-material injection molding.

[0035] Anti-stick coating:

[0036] An anti-stick coating is applied to the surfaces of the rotor 300 and vane 310, as well as the inner wall of the injection chamber 200. This significantly reduces material adhesion during the injection process, effectively reducing cleaning difficulty and improving production efficiency. It also prevents adhesion or wear between materials and components under high temperature or high viscosity conditions, extending the service life of core components.

[0037] Specifically, the injection mold 100 has a drive motor 110 and a worm gear reducer 120 on its surface;

[0038] Two injection chambers 200 are symmetrically installed on both sides of the worm gear reducer box 120;

[0039] Each of the injection chambers 200 has an eccentrically mounted rotor 300 inside. The surface of the rotor 300 is provided with a plurality of grooves 301. Each groove 301 has a sliding plate 310 slidably mounted inside it, and the inner side of the groove 301 is provided with an elastic element 302 that abuts against one end of the sliding plate 310.

[0040] The drive motor 110 and the worm gear reducer 120 together form the rotational driving force for the rotor 300.

[0041] In this embodiment, the injection chamber 200 is provided with a feed inlet 210 at the top and an injection port 220 at the bottom, so that the material enters the injection chamber 200 along the feed inlet 210 and is discharged from the injection port 220.

[0042] In this embodiment, the rotor 300 is eccentrically arranged relative to the center of the injection chamber 200, and during rotation, the sliding plate 310 is always in contact with the inner wall of the injection chamber 200 under the action of the elastic member 302 to form a dynamic seal and realize the extrusion and conveying of materials.

[0043] In this embodiment, the output end of the worm gear reducer 120 is connected to the rotor 300 via a synchronous shaft 121 to maintain the synchronous rotation of the two rotors 300 and to ensure that the material flow in the injection chambers 200 on both sides achieves the same rotational speed and flow rate.

[0044] In this embodiment, the elastic element 302 is a spring or rubber structure, used to provide continuous thrust to the slide 310 when the rotor 300 rotates, keeping the slide 310 in contact with the inner wall of the injection chamber 200.

[0045] Working principle:

[0046] When the drive motor 110 starts, power is output to the rotor 300 through the worm gear reducer 120. The rotor 300 rotates accordingly, and the sliding vane 310, under the action of the elastic element 302, remains in contact with the inner wall of the injection chamber 200, forming several working chambers around the center of the rotor. When the rotor 300 rotates, each working chamber draws in material at the feed inlet 210 and squeezes the material out when it rotates to the vicinity of the injection port 220. This process is continuously cyclical, achieving stable material conveying and pressurization. At the same time, since the two injection chambers 200 rotate in tandem through the synchronous shaft 121, synchronous and uniform dual-stream material flow can be obtained, which is beneficial for the process requirements of multi-material or two-color injection molding.

[0047] Advantages and effects:

[0048] Synchronous dual-injection: The synchronous shaft 121 ensures that the two material streams have the same rotation speed and flow rate, improving the consistency of dual-injection molded products.

[0049] Increased pressure: The rotor 300 and the vane 310 form a structure similar to a vane pump, which can effectively increase the pressure of materials and meet the injection molding requirements of high pressure or high viscosity applications.

[0050] Compact structure: The drive motor 110 and the worm gear reducer 120 are integrated on the surface of the injection mold 100, making the overall structure compact, occupying little space, and easy to install and maintain.

[0051] Easy to clean: The surface and inner wall of key components are coated with an anti-stick coating, which greatly reduces the problem of material adhesion and makes subsequent cleaning and maintenance more convenient.

[0052] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand 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 claims and their equivalents.

Claims

1. A two-shot injection mold characterized in that, Include: Injection mold (100), its surface is provided with drive motor (110) and worm reduction box (120); Both sides of the worm reduction box (120) are symmetrically provided with two injection cabins (200); Each injection cabin (200) is eccentrically rotatably provided with a rotor (300), and the surface of the rotor (300) is provided with a plurality of sliding grooves (301), each sliding groove (301) is slidably provided with a sliding sheet (310), and the inner side of the sliding groove (301) is provided with an elastic element (302) abutting one end of the sliding sheet (310); The drive motor (110) and the worm reduction box (120) jointly form the rotation driving force of the rotor (300).

2. A two-shot injection mold according to claim 1, wherein The upper part of the injection cabin (200) is provided with a feeding port (210), and the bottom is provided with a injection port (220), so that the material enters the injection cabin (200) along the feeding port (210) and is discharged from the injection port (220).

3. A two-shot injection mold according to claim 2, wherein, The rotor (300) is eccentrically arranged relative to the center position of the injection cabin (200), and in the rotation process, the sliding sheet (310) is always in abutment with the inner wall of the injection cabin (200) under the action of the elastic element (302), so as to form dynamic sealing and realize extrusion and conveying of the material.

4. A two-shot injection mold in accordance with claim 1, wherein, The output end of the worm reduction box (120) is connected with the rotor (300) through a synchronous shaft (121), so as to keep the synchronous rotation of the two rotors (300), and the flow in the two injection cabins (200) obtains the same rotation speed and flow.

5. A two-shot injection mold in accordance with claim 1, wherein, The elastic element (302) is a spring or rubber structure, which provides a continuous thrust for the sliding sheet (310) to keep the sliding sheet (310) in abutment with the inner wall of the injection cabin (200) when the rotor (300) rotates.

6. A two-shot injection mold in accordance with claim 1, wherein, The drive motor (110) outputs large torque through the worm reduction box (120) to drive the rotor (300) to rotate, thereby providing power compensation for flow conveying.

7. A two-shot injection mold as defined in claim 1, wherein, The surfaces of the rotor (300) and the sliding sheet (310) and the inner wall of the injection cabin (200) are provided with an anti-sticking coating, which is used to reduce the adhesion of the material during injection, and facilitates subsequent cleaning and maintenance.

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