An injection mold and injection molding equipment

Abstract

This invention discloses an injection mold and injection molding equipment, relating to the field of mold equipment. The injection mold includes a first mold assembly, a second mold assembly, and a third mold assembly. The first mold assembly includes a first mold core, the second mold assembly includes a second mold core and a third mold core, and the third mold assembly includes a fourth mold core. The first and second mold cores, when the mold is closed, enclose a first cavity for injection molding; the third and fourth mold cores, when the mold is closed, enclose a second cavity for injection molding. The first mold assembly has a first hot runner system, the runners of which are connected to the gate of the first cavity. The second mold assembly has a second hot runner system, the runners of which are connected to the gate of the second cavity. This invention, while maintaining the high-volume advantage of stacked molds, effectively optimizes the arrangement of the hot runner system, reduces the structural burden on the mold, and improves the balance, stability, and reliability of the injection molding process.

Description

Technical Field

[0001] This invention relates to the field of mold equipment technology, and in particular to an injection mold and injection equipment. Background Technology

[0002] Injection molding is one of the most widely used processes in plastic product processing. With the continuous growth in demand for plastic products, the injection molding industry has placed higher demands on production efficiency, cost control, and equipment resource utilization. To increase output per unit time and reduce part costs, stack molds (also known as multi-layer molds or mack molds) are widely used. These molds achieve a multiple increase in output per injection cycle based on the number of cavity layers by setting multiple stacked cavities between the moving and stationary molds, while simultaneously improving equipment utilization without significantly increasing the clamping force of the injection molding machine.

[0003] However, existing stacked molds typically consist of a moving mold, a middle mold, and a fixed mold, and often employ a design where the hot runner is concentrated in the middle mold for centralized injection. In this design, the hot runner is centrally located in the middle mold, simultaneously supplying plastic to the injection cavities distributed on both sides. The applicant has found that when different injection molded parts are produced in the injection cavities on both sides of the middle mold, the geometry, runner length, and distribution of the injection cavities differ, resulting in inconsistent flow resistance of the molten plastic in different injection cavities. This leads to uneven plastic distribution due to the simultaneous injection from both sides of the middle mold. Furthermore, the centralized arrangement of the hot runner in the middle mold increases the mold weight, complicates mold installation and maintenance, and is prone to eccentricity, wear, and other malfunctions, thus limiting the mold's production efficiency and service life. Summary of the Invention

[0004] To address the technical problems in existing stacked molds, which typically employ a centralized injection design in the middle mold, resulting in excessive mold weight, complex installation and maintenance, and limitations on mold production efficiency and service life, the present invention aims to provide an injection mold that, while maintaining the high-volume advantages of stacked molds, effectively optimizes the arrangement of the hot runner system, reduces the structural burden on the mold, and improves the balance, stability, and reliability of the injection process, thereby enhancing the overall production efficiency of the mold.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] In a first aspect, the present invention provides an injection mold, comprising a first mold assembly, a second mold assembly, and a third mold assembly that are sequentially stacked and capable of opening and closing relative to each other;

[0007] The first mold assembly includes a first mold core, the second mold assembly includes a second mold core and a third mold core, and the third mold assembly includes a fourth mold core;

[0008] The first mold core and the second mold core close together to form a first cavity for injection molding; the third mold core and the fourth mold core close together to form a second cavity for injection molding.

[0009] The first mold assembly has a first hot runner system, the first hot runner system is connected to the injection molding machine, and the runner of the first hot runner system is connected to the gate of the first cavity;

[0010] The second mold assembly has a second hot runner system, the runner of the second hot runner system is connected to the gate of the second cavity, and when the mold is closed, the runner of the first hot runner system is connected to the runner of the second hot runner system to form a continuous runner structure.

[0011] In conjunction with the first aspect, the present invention also provides a first specific embodiment of the first aspect, wherein preferably, the flow channels of the first hot runner system and / or the second hot runner system are provided with control valves, the control valves being switchable between a first position and a second position;

[0012] When the control valve is in the first position, it connects the flow channels of the first hot runner system with the flow channels of the second hot runner system; when the control valve is in the second position, it blocks the connection between the flow channels of the first hot runner system and the flow channels of the second hot runner system.

[0013] In conjunction with the first aspect, the present invention also provides a second specific embodiment of the first aspect. Preferably, the flow channel of the first hot runner system is provided with a plurality of first needle valve type connecting hot nozzles, and the flow channel of the second hot runner system is provided with a plurality of second needle valve type connecting hot nozzles.

[0014] During mold closing, the first needle valve type connecting hot nozzle connects to the corresponding second needle valve type connecting hot nozzle, so that the flow channel of the first hot runner system is connected to the flow channel of the second hot runner system.

[0015] In conjunction with the first aspect, the present invention also provides a third specific embodiment of the first aspect. Preferably, the first hot runner system includes a first manifold, a plurality of first needle valve injection hot nozzles, and a plurality of first needle valve connecting hot nozzles.

[0016] The first needle valve type injection hot nozzle is disposed on the first manifold, and the first needle valve type injection hot nozzle is connected to the first manifold channel inside the first manifold; the first needle valve type injection hot nozzle is connected to the gate of the first cavity.

[0017] The first needle valve type hot nozzle is disposed on the first manifold plate, and the first needle valve type hot nozzle is connected to the first manifold channel inside the first manifold plate; when the mold is closed, the first needle valve type hot nozzle is connected to the flow channel of the second hot runner system.

[0018] In conjunction with the first aspect, the present invention also provides a fourth specific embodiment of the first aspect, wherein preferably, the first mold assembly includes:

[0019] panel;

[0020] A first manifold support plate is connected to the panel, and the first hot runner system is disposed on the first manifold support plate.

[0021] The first mold core is connected to the distributor plate support plate, and the first mold core is provided with a coolant channel.

[0022] In conjunction with the first aspect, the present invention also provides a fifth specific embodiment of the first aspect, wherein preferably, the second hot runner system includes a second manifold, a plurality of second needle valve injection hot nozzles and a plurality of second needle valve connecting hot nozzles;

[0023] The second needle valve injection hot nozzle is disposed on the second manifold, and the second needle valve injection hot nozzle is connected to the second manifold channel inside the second manifold; the second needle valve injection hot nozzle is connected to the gate of the second cavity;

[0024] The second needle valve type hot nozzle is disposed on the second manifold, and the second needle valve type hot nozzle is connected to the second manifold channel inside the second manifold; when the mold is closed, the second needle valve type hot nozzle is connected to the flow channel of the first hot runner system.

[0025] In conjunction with the first aspect, the present invention also provides a sixth specific embodiment of the first aspect, wherein, preferably, the second mold assembly includes:

[0026] First mold core pad, the first mold core pad is connected to the second mold core;

[0027] The second manifold support plate is connected to the first mold core pad plate, and the second hot runner system is disposed on the second manifold support plate.

[0028] The second mold core pad is connected to the second manifold support plate, and the second manifold support plate is located between the first mold core pad and the second mold core pad.

[0029] In conjunction with the first aspect, the present invention also provides a seventh specific embodiment of the first aspect, wherein, preferably, the injection mold further includes:

[0030] A load-bearing structure connected to the second mold assembly, the load-bearing structure being configured to fix the second mold assembly to the frame or moving mechanism of the injection molding machine.

[0031] In conjunction with the first aspect, the present invention also provides an eighth specific embodiment of the first aspect, wherein, preferably, the load-bearing structure comprises:

[0032] Support plate, the support plate being used to connect the frame or moving mechanism of the injection molding machine;

[0033] Two bases are connected to the support plate, and the two bases are respectively located at a distance on both sides of the surface of the support plate; each base is connected to an adjusting pad.

[0034] Two fixing blocks are respectively connected to the two bases, and the fixing blocks are bolted to the stacked first mold core pad, second diversion plate support plate and second mold core pad.

[0035] Secondly, the present invention also provides an injection molding apparatus, wherein the injection molding apparatus is provided with the injection molds described in the first aspect and the first to eighth specific embodiments of the first aspect.

[0036] Compared with the prior art, the present invention has at least the following beneficial effects:

[0037] This invention provides an injection mold, comprising a first mold assembly, a second mold assembly, and a third mold assembly stacked sequentially and capable of opening and closing relative to each other. The first mold assembly includes a first mold core, the second mold assembly includes a second mold core and a third mold core, and the third mold assembly includes a fourth mold core. When the mold is closed, the first and second mold cores enclose a first cavity for injection molding; when the mold is closed, the third and fourth mold cores enclose a second cavity for injection molding. The first mold assembly has a first hot runner system connected to an injection molding machine, and the runners of the first hot runner system are connected to the gate of the first cavity. The second mold assembly has a second hot runner system, and the runners of the second hot runner system are connected to the gate of the second cavity. When the mold is closed, the runners of the first and second hot runner systems are connected to form a continuous runner structure.

[0038] (1) This technology provides an injection mold that forms a multi-layer cavity by sequentially stacking a first mold assembly, a second mold assembly and a third mold assembly, and forming a multi-layer cavity in the mold-closed state. In a single injection process, the molding operation of the multi-layer cavity can be completed simultaneously, thereby significantly improving the production output per unit time.

[0039] (2) This technology sets a first hot runner system in the first mold assembly and a second hot runner system in the second mold assembly. The first hot runner system is connected to the gate of the first cavity, and the second hot runner system is connected to the gate of the second cavity. When the mold is closed, the runners of the first hot runner system and the runners of the second hot runner system are connected to form a continuous runner structure. This changes the traditional stacked mold structure that concentrates the injection system in the middle mold, making the material supply path of different cavities more reasonable.

[0040] (3) By distributing the hot runner system across different mold components, not only can the structural complexity and overall weight of intermediate mold components be reduced, and problems such as mold eccentricity, wear, and maintenance difficulties caused by concentrated hot runners be minimized, but also the stable delivery and mold filling balance of molten plastic can be better achieved during multi-cavity injection molding, thereby improving product molding quality and mold operation stability. In addition, since the first and second hot runner systems form a continuous flow channel structure when the mold is closed, the molten plastic can be sequentially distributed to each cavity through a unified feeding path, ensuring flow continuity while taking into account the independent feeding characteristics of each cavity, thereby improving the flexibility and adaptability of mold structure design.

[0041] In summary, through the above structural design, while maintaining the high output advantage of stacked molds, the layout of the hot runner system is effectively optimized, the structural burden on the mold is reduced, and the balance, stability and reliability of the injection molding process are improved, thereby enhancing the overall production efficiency of the mold.

[0042] The present invention also provides an injection molding device having the above-mentioned injection mold, and the injection molding device has the above-mentioned technical effects. Attached Figure Description

[0043] Figure 1 A schematic diagram of the structure of an injection mold provided by the present invention;

[0044] Figure 2 An assembly diagram of an injection mold provided by the present invention;

[0045] Figure 3 An assembly diagram of a first hot runner system and a second hot runner system for an injection mold provided by the present invention;

[0046] Figure 4 This invention provides a structural schematic diagram of an injection molding device;

[0047] In the picture:

[0048] 10 - Injection mold;

[0049] 100 - First mold assembly, 110 - Panel, 120 - First manifold support plate, 130 - First mold core, 140 - First hot runner system, 141 - First manifold, 142 - First needle valve injection nozzle, 143 - First needle valve connecting nozzle;

[0050] 200-Second mold assembly, 210-First mold core pad, 220-Second manifold support plate, 230-Second mold core pad, 240-Second mold core, 250-Third mold core, 260-Second hot runner system, 261-Second manifold, 262-Second needle valve injection nozzle, 263-Second needle valve connecting nozzle, 270-Load-bearing structure;

[0051] 300 - Third mold assembly; 310 - Fourth mold core;

[0052] 20 - Injection molding equipment, 21 - Mold closing mechanism, 211 - Moving components. Detailed Implementation

[0053] To facilitate understanding of the present invention, the technical solutions and advantages of the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Any mechanisms or methods not elaborated in this invention can be referred to in the prior art. The specific structures and features of the present invention are illustrated below by way of example and should not be construed as limiting the present invention in any way. Furthermore, any of the technical features mentioned below (including implicit or disclosed features), as well as any technical features directly shown or implied in the figures, can be arbitrarily combined or deleted among these technical features to form more other embodiments that may not be directly or indirectly mentioned in this invention. The accompanying drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0055] In the following description, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0056] Furthermore, in this application, directional terms such as "upper," "lower," "left," "right," "horizontal," and "vertical" are defined relative to the indicated placement of components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the placement of components in the drawings. In this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can refer to a mechanical or physical connection. It can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. It can also be understood as physical contact and electrical conduction between components, or as a form of connection between different components in a circuit structure via physical lines capable of transmitting electrical signals, such as PCB copper foil or wires.

[0057] Currently, injection molding is one of the most widely used molding processes in the plastics product processing industry. With the expanding application of plastic products in packaging, daily necessities, and industrial products, the market demand for plastic products continues to grow, thus placing higher demands on production efficiency, cost control, and equipment resource utilization in the injection molding process.

[0058] Against this backdrop, stacked molds have gradually become an important technical means to improve injection molding production efficiency. Stacked molds, by setting up a multi-layered cavity structure between the moving and stationary molds, allow the injection molding machine to simultaneously mold multiple parts in a single injection cycle. This results in a near-multiplicative increase in part output per unit time with the increase in the number of cavity layers, without significantly increasing the clamping force of the injection molding machine. This structure can significantly improve the utilization rate of injection molding equipment and effectively reduce the production cost of individual parts, thus becoming an important technical direction for solving the problem of limited production efficiency of traditional single-layer molds.

[0059] However, most existing stack molds adopt a standard stack mold structure, with their injection system typically concentrated in the middle mold area, allowing injection from the middle mold to both side cavities simultaneously. When stack molds are used to produce parts with different front and rear mold structures or product shapes, this concentrated injection method often struggles to ensure injection balance between cavities. Furthermore, because the hot runner system is centrally located in the middle mold area, the middle mold structure is quite heavy, increasing the overall structural load on the mold and causing significant inconvenience for installation, disassembly, and maintenance during actual production. It is also prone to problems such as eccentricity and wear due to uneven stress, thus affecting the mold's service life and production stability.

[0060] Therefore, this application provides an injection mold comprising a first mold assembly, a second mold assembly, and a third mold assembly stacked sequentially and capable of opening and closing relative to each other. By providing a first hot runner system in the first mold assembly and a second hot runner system in the second mold assembly, wherein the first hot runner system is connected to the gate of the first cavity and the second hot runner system is connected to the gate of the second cavity, and during mold closing, the runners of the first and second hot runner systems are connected to form a continuous runner structure, thereby changing the traditional stacked mold structure where the injection system is concentrated in the middle mold, making the material supply paths of different cavities more rational.

[0061] This invention distributes the hot runner system across different mold components, which not only reduces the structural complexity and overall weight of intermediate mold components and mitigates problems such as mold eccentricity, wear, and maintenance difficulties caused by concentrated hot runners, but also better achieves stable delivery and mold filling balance of molten plastic during multi-cavity injection molding, improving product molding quality and mold operational stability. Furthermore, because the first and second hot runner systems form a continuous flow channel structure upon mold closing, the molten plastic can be sequentially distributed to each cavity through a unified feeding path, ensuring flow continuity while also accommodating the independent feeding characteristics of each cavity, thereby improving the flexibility and adaptability of mold structure design.

[0062] In summary, through the above structural design, while maintaining the high output advantage of stacked molds, the layout of the hot runner system is effectively optimized, the structural burden on the mold is reduced, and the balance, stability and reliability of the injection molding process are improved, thereby enhancing the overall production efficiency of the mold.

[0063] Figure 1 This is a schematic diagram of the structure of the injection mold provided in the embodiments of this application, such as... Figure 1As shown, this application embodiment provides an injection mold 10, including a first mold assembly 100, a second mold assembly 200, and a third mold assembly 300 stacked sequentially and capable of opening and closing relative to each other. The first mold assembly 100 includes a first mold core 130, the second mold assembly 200 includes a second mold core 240 and a third mold core 250, and the third mold assembly 300 includes a fourth mold core 310. The first mold core 130 and the second mold core 240 form a first cavity for injection molding when the mold is closed; the third mold core 250 and the fourth mold core 310 form a second cavity for injection molding when the mold is closed. The first mold assembly 100 has a first hot runner system 140, which is connected to an injection molding machine, and the runners of the first hot runner system 140 are connected to the gate of the first cavity. The second mold assembly 200 has a second hot runner system 260, the runner of the second hot runner system 260 is connected to the gate of the second cavity, and when the mold is closed, the runner of the first hot runner system 140 is connected to the runner of the second hot runner system 260 to form a continuous runner structure.

[0064] This embodiment provides a multi-cavity injection mold 10 to improve injection molding production efficiency, optimize material flow, and ensure the dimensional accuracy and surface quality of the parts. The injection mold 10 includes a first mold assembly 100, a second mold assembly 200, and a third mold assembly 300 that are stacked sequentially and can open and close relative to each other. Each mold assembly can be disassembled, maintained, and replaced individually to facilitate mold processing, installation, and long-term use.

[0065] In this embodiment, the first mold assembly 100 includes a first mold core 130, the second mold assembly 200 includes a second mold core 240 and a third mold core 250, and the third mold assembly 300 includes a fourth mold core 310. In the mold-closed state, the first mold core 130 and the second mold core 240 enclose a first cavity for injection molding a plurality of first workpieces; the third mold core 250 and the fourth mold core 310 enclose a second cavity for injection molding a plurality of second workpieces. Through this structure, this embodiment can form workpieces with two independent cavities in the same injection molding cycle, thereby significantly improving the mold's production efficiency and capacity. The first and second cavities are designed with different shapes to adapt to the injection molding requirements of different products.

[0066] Understandably, the first and second cavities employ completely different cavity structures to mass-produce injection molded parts with different structures within the same injection molding cycle. This effectively solves the problem of uneven glue distribution, which easily occurs when producing injection molded parts with different shapes, sizes, or wall thicknesses using traditional side-mounted injection molds, leading to quality defects.

[0067] To achieve efficient injection molding material filling, the first mold assembly 100 is equipped with a first hot runner system 140, which is connected to the injection molding machine. The hot runner system 140 forms a multi-stage branched flow channel, and its channels are connected to the gate of the first cavity. The first hot runner system 140 may include structures such as a needle valve injection nozzle, a manifold, and a needle valve connecting nozzle to ensure that the molten material enters the cavity uniformly and stably. The second mold assembly 200 is equipped with a second hot runner system 260, whose channels are connected to the gate of the second cavity for guiding the molten material into the second cavity. The second hot runner system 260 can be designed with a similar structure to the first hot runner system 140, including structures such as a needle valve injection nozzle, a manifold, and a needle valve connecting nozzle to achieve balanced and stable material flow.

[0068] When the mold is closed, the runners of the first hot runner system 140 and the second hot runner system 260 are connected to form a continuous runner structure, enabling injection molding of the first and second cavities. This changes the traditional stacked mold structure where the injection system is concentrated in the middle mold, making the material supply paths of different cavities more rational. On the other hand, by distributing the hot runner systems across different mold components, not only can the structural complexity and overall weight of the intermediate mold components be reduced, and problems such as mold eccentricity, wear, and maintenance difficulties caused by concentrated hot runners be minimized, but also the stable delivery and mold filling balance of molten plastic can be better achieved during multi-cavity injection molding, improving product molding quality and mold operation stability.

[0069] Furthermore, since the first hot runner system 140 and the second hot runner system 260 form a continuous flow channel structure when the mold is closed, the molten plastic can be sequentially distributed to each cavity through a unified feeding path. This ensures the continuity of flow while taking into account the independent feeding characteristics of each cavity, thereby improving the flexibility and adaptability of the mold structure design.

[0070] In this embodiment, the first mold core 130, the second mold core 240, and the third mold core 250 can be made of metal. When producing high-precision workpieces, the mold cores can be made of hard steel with good wear resistance to ensure the cavity dimensions and surface accuracy. In special application scenarios, the first mold core 130, the second mold core 240, and the third mold core 250 can be made of light-transmitting mold materials to cooperate with photopolymerization injection molding technology to achieve precision molding of complex optical or microstructures.

[0071] Furthermore, to adapt to the process requirements of different injection molded products, the gates of the first and second cavities can be configured as single-point, double-point, or multi-point gates to ensure uniform filling of the cavities by the molten material. The design of the first / second hot runner system and the first / second cavity can be optimized according to the product size, number of parts, thickness, and characteristics of the injection molding material to achieve efficient and uniform injection molding.

[0072] This embodiment, through the above structural design, not only realizes multi-cavity injection molding, but also improves the flexibility, stability and maintainability of the injection molding process through continuous flow channel connection, reasonable cavity layout and modular detachable design, and effectively reduces the production cost per unit part.

[0073] like Figure 2 As shown in this embodiment, control valves are installed in the flow channels of the first hot runner system 140 and the second hot runner system 260. These control valves can switch between a first position and a second position. When the control valve is in the first position, the flow channels of the first hot runner system 140 and the second hot runner system 260 are connected; when the control valve is in the second position, the connection between the flow channels of the first hot runner system 140 and the second hot runner system 260 is blocked.

[0074] In this embodiment, a control valve is used to adjust the connection between the two hot runner systems, enabling flexible control of the injection molding process. The control valve can be a needle valve, ball valve, or slide valve, driven by an electric, pneumatic, or hydraulic actuator to achieve high-precision automatic switching. This solution is suitable for complex molds or high-precision, multi-cavity injection molding scenarios, improving production efficiency and workpiece molding quality while ensuring stable material flow.

[0075] Preferably, the control valve is located at the connection section between the two hot runner systems, which facilitates installation, maintenance, and material flow regulation, while reducing heat loss and material retention, thus improving the overall efficiency of the hot runner system. In practical applications, the number, size, and switching logic of the control valve can be optimized according to the number of cavities, mold structure, and characteristics of the injection molding material, thereby further improving the mold's production performance and part quality.

[0076] In one specific embodiment, control valves are installed in the flow channels of both the first hot runner system 140 and the second hot runner system 260. This scheme allows for independent control of the two hot runner systems simultaneously, thereby improving operational reliability. Further explanation is provided using this scheme as an example:

[0077] In this embodiment, both the flow channels of the first hot runner system 140 and the second hot runner system 260 are equipped with control valves. These control valves can switch between a first position and a second position. Specifically, when both control valves are in the first position, the flow channels of the first hot runner system 140 and the second hot runner system 260 are connected, forming a continuous hot runner structure. This allows the injection molding material to flow smoothly from the first hot runner system 140 to the flow channels of the second hot runner system 260 and the corresponding second cavity. This configuration is suitable for processes involving simultaneous injection molding of multiple cavities or requiring continuous injection molding, which helps improve production efficiency and ensures the stability of material flow.

[0078] When any control valve is in the second position, the connection between the first hot runner system 140 and the second hot runner system 260 is blocked, allowing the first hot runner system 140 to operate independently. In this state, the first hot runner system 140 only supplies material to the first cavity, while the second hot runner system 260 is isolated. By switching the control valve positions, continuous injection or individual injection can be flexibly selected according to production needs, ensuring process diversity while reducing material waste and pressure fluctuations in the mold's hot runner system.

[0079] In another specific embodiment, a control valve is installed only in the flow channel of the first hot runner system. This control valve can switch between a first position and a second position. When the control valve is in the first position, the flow channels of the first and second hot runner systems are connected, enabling continuous injection molding. When the control valve is in the second position, the connection between the first and second hot runner systems is blocked, allowing the first hot runner system to independently supply material to the first cavity. This is suitable for segmented injection molding or single-cavity injection molding operations. This solution has a simple structure; the flow of injection molding material can be controlled simply by arranging a control valve in the first hot runner system.

[0080] In other specific embodiments, a control valve is installed only in the flow channel of the second hot runner system. The control valve can also switch between a first position and a second position to control the flow direction of the second hot runner system. When in the first position, the second hot runner system is connected to the first hot runner system, enabling continuous injection molding; when in the second position, the second hot runner system operates independently, feeding material to the second cavity. This design facilitates individual control of the injection into the second cavity in multi-cavity injection molds, reducing the impact on the first cavity, and is suitable for situations requiring segmented injection molding or special control requirements for the second cavity.

[0081] In one specific implementation, the control valve employs a needle valve type hot nozzle. Specifically, the flow channel of the first hot runner system 140 is provided with a plurality of first needle valve type connecting hot nozzles 143, and the flow channel of the second hot runner system 260 is provided with a plurality of second needle valve type connecting hot nozzles 263. During mold closing, the first needle valve type connecting hot nozzles 143 connect to the corresponding second needle valve type connecting hot nozzles 263, thereby connecting the flow channels of the first hot runner system 140 and the flow channels of the second hot runner system 260.

[0082] In this embodiment, the control valve preferably adopts a needle valve type hot nozzle structure to achieve precise flow control between the two hot runner systems. In one specific implementation, the flow channel of the first hot runner system 140 is provided with a plurality of first needle valve type connecting hot nozzles 143, and the flow channel of the second hot runner system 260 is provided with a plurality of second needle valve type connecting hot nozzles 263. The first needle valve type connecting hot nozzles 143 and the second needle valve type connecting hot nozzles 263 are connected correspondingly in the mold-closed state, thereby forming a continuous channel between the flow channels of the first hot runner system 140 and the flow channels of the second hot runner system 260, realizing continuous injection molding operation.

[0083] This needle valve type hot runner can be switched and controlled as needed during injection molding: when the first needle valve type connecting hot runner 143 and the second needle valve type connecting hot runner 263 are in the closed state (i.e., the second position), the connection between the first hot runner system 140 and the second hot runner system 260 is blocked, allowing the first cavity to be injected independently. When the first needle valve type connecting hot runner 143 and the second needle valve type connecting hot runner 263 are simultaneously in the open state (i.e., the first position), the two sets of hot runner systems are connected, and the injection material can flow continuously to the first cavity and the second cavity. In this way, the needle valve type hot runner not only achieves flexible switching of the flow channels, but also effectively controls the injection volume and injection sequence of the material, ensuring the accuracy and consistency of multi-cavity injection molding.

[0084] The first needle valve type connecting hot nozzle 143 and the second needle valve type connecting hot nozzle 263 are preferably located at the connection section of the two hot runner systems, which facilitates installation and maintenance while reducing heat loss and material retention. Structurally, the first needle valve type connecting hot nozzle 143 and the second needle valve type connecting hot nozzle 263 can be pneumatically or hydraulically driven, enabling the needle valve to move precisely under high temperature and high pressure conditions, ensuring reliable flow channel sealing, preventing material backflow or leakage, thereby improving the stability of mold injection molding and product quality.

[0085] Furthermore, the first needle valve type connecting hot nozzle 143 and the second needle valve type connecting hot nozzle 263 can be arranged according to the size of the mold cavity. Multiple first needle valve type connecting hot nozzles 143 and second needle valve type connecting hot nozzles 263 are evenly distributed to ensure balanced injection pressure in the cavity and avoid localized insufficient flow or short shots. In the multi-cavity injection mold 10, this design can significantly improve injection efficiency and support multiple injection molding process modes, such as single-cavity injection, segmented injection, and continuous cavity injection, meeting the injection molding needs of complex products.

[0086] like Figure 2As shown, in one specific embodiment, the first mold assembly 100 includes a panel 110, a first manifold support plate 120, and a first mold core 130. The first manifold support plate 120 serves as the supporting base plate of the first mold assembly 100, providing support and positioning for the panel 110 and the first mold core 130. The first manifold support plate 120 is connected to the panel 110, and a first hot runner system 140 is disposed on the first manifold support plate 120 for guiding the molten plastic supplied by the injection molding machine into each cavity. By disposing of the first hot runner system 140 on the manifold support plate, efficient connection between the hot runner and the first mold core 130 can be achieved, while facilitating the installation, debugging, and maintenance of the hot runner.

[0087] Specifically, the first mold core 130 is connected to the first manifold support plate 120, and the first mold core 130 forms part of the sidewall and cavity shape of the first cavity. To ensure the temperature stability of the first mold core 130 and the cooling effect of the product during injection molding, a coolant channel is provided inside the first mold core 130 for circulating coolant. The coolant channel can quickly remove the heat absorbed by the mold core during injection molding, thereby controlling the cavity temperature and improving the dimensional accuracy and surface quality of the injection molded product. The arrangement of the coolant channel can be optimized according to the cavity shape to ensure uniform cooling of all parts of the mold and prevent local overheating or warping.

[0088] Through the above structural design, the first mold assembly 100 not only ensures that the injection material flows into the cavity evenly from the hot runner, but also optimizes the temperature control and cooling efficiency of the mold core, providing a reliable foundation for subsequent multi-cavity injection molding and continuous injection molding.

[0089] like Figure 3 As shown, in a specific implementation, the first hot runner system 140 includes a first manifold 141, a plurality of first needle valve injection nozzles 142, and a plurality of first needle valve connecting nozzles 143. The first manifold 141, as the core distribution component of the first hot runner system 140, is used to evenly distribute the molten plastic conveyed by the injection molding machine to each cavity or to the flow channel connecting the second hot runner system 260.

[0090] Specifically, a first needle valve type injection nozzle 142 is disposed on a first manifold 141, and the first needle valve type injection nozzle 142 is connected to a first manifold channel inside the first manifold 141; the first needle valve type injection nozzle 142 is connected to the gate of the first cavity. For example, the first needle valve type injection nozzle 142 is disposed on the first manifold 141, its lower end is connected to the gate of the first cavity, and its upper end is connected to the first manifold channel inside the first manifold 141. During the injection molding process, the first needle valve type injection nozzle 142 can precisely control the injection time and flow rate of the molten plastic, achieving synchronization and uniformity of injection into each cavity, and improving the dimensional accuracy and surface quality of the product.

[0091] Specifically, a first needle valve type connecting hot nozzle 143 is disposed on the first manifold 141, and the first needle valve type connecting hot nozzle 143 is connected to the first manifold channel inside the first manifold 141; during mold closing, the first needle valve type connecting hot nozzle 143 connects to the flow channel of the second hot runner system 260. For example, the first needle valve type connecting hot nozzle 143 is also disposed on the first manifold 141 and is connected to the first manifold channel inside the first manifold 141. During mold closing, the first needle valve type connecting hot nozzle 143 connects to the flow channel of the second hot runner system 260, forming a continuous flow channel structure, realizing controllable communication between the flow channels of the first hot runner system 140 and the second hot runner system 260.

[0092] Based on the above structural design, by integrating the first needle valve type injection hot nozzle 142 and the first needle valve type connecting hot nozzle 143 into the manifold, not only is the structure and layout of the hot runner simplified, but the maintainability and temperature control accuracy of the injection molding system are also improved, providing a reliable technical guarantee for high-precision, multi-cavity, and multi-component continuous injection molding.

[0093] like Figure 3 As shown, in one specific embodiment, a feeding hot nozzle is provided on the first manifold 141. The feeding hot nozzle is connected to the injection molding machine and is used to receive the molten plastic conveyed by the injection molding machine. The feeding hot nozzle guides the molten plastic into the first manifold channel inside the first manifold 141, and conveys it through the first manifold channel to the first needle valve injection hot nozzle 142 and the first needle valve connecting hot nozzle 143 respectively.

[0094] By incorporating a hot-feed nozzle, the first hot runner system 140 can stably receive molten plastic from the injection molding machine, achieving an efficient connection between the hot runner and the injection molding machine. This structure ensures that the plastic, after entering the first manifold 141, can be evenly distributed to each cavity or the connection point connected to the second hot runner system 260, thereby improving the molding uniformity and dimensional accuracy of the injection molded products. Simultaneously, the hot-feed nozzle can be used in conjunction with a needle valve injection nozzle to achieve precise control of the injection volume in each cavity, making it suitable for multi-cavity or multi-component injection molds 10.

[0095] In this specific embodiment, both the first needle valve injection nozzle 142 and the first needle valve connecting nozzle 143 adopt a cylinder-driven needle valve nozzle structure. The needle valve nozzle structure includes a needle valve body, a needle rod, a driving cylinder, and a mounting base. The needle valve body has a needle valve hole, and the needle rod slides axially along the needle valve hole. One end of the needle rod controls the opening and closing of the needle valve hole, and the other end is connected to the cylinder piston. When the cylinder piston is pushed by pressure within the cylinder, the needle rod moves along the needle valve hole, realizing the opening and closing action of the needle valve. The driving cylinder is mounted on the outer wall of the other side of the first distributor plate 141.

[0096] The needle valve body is fixed to the first manifold 141 via a mounting base, so that the needle rod end of the needle valve is aligned with the manifold channel inside the first manifold 141. Specifically, the needle rod end of the first needle valve injection nozzle 142 is aligned with the gate of the first cavity, ensuring that molten plastic can be smoothly injected into the first cavity from the manifold channel of the first manifold 141 through the needle valve. Meanwhile, the needle rod end of the first needle valve connecting nozzle 143 can be connected to the corresponding flow channel of the second hot runner system 260 when the mold is closed, so as to form a continuous flow channel structure.

[0097] In the specific installation structure, the needle valve body is fixed to the first flow divider plate 141 by threads or locating pins to ensure that the needle valve does not shift during injection molding. The drive cylinder is fixed to the other side surface of the first flow divider plate 141 by a threaded connection or bracket, located above the needle valve body. The piston movement of the cylinder precisely controls the opening and closing of the needle rod along the axis of the needle valve, thereby realizing the opening and closing switching of the flow channel. This cylinder-driven needle valve hot nozzle structure can withstand the long-term action of high-temperature molten plastic and provides fast, repeatable, and stable opening and closing control.

[0098] In one specific implementation, the first flow divider is an integral structure, comprising a connecting portion located in the middle and two flow dividers respectively disposed at both ends of the connecting portion; the connecting portion is generally strip-shaped and has a main flow channel inside, and the connecting portion is connected to the feed nozzle. Each flow divider has a branch flow channel inside, and the main flow channel and the two branch flow channels together constitute the first flow divider of the first flow divider. The flow divider is generally H-shaped, including two support arms arranged at intervals and a transverse connecting arm connecting the two support arms, and the end of the connecting portion is connected to the transverse connecting arm of the flow divider.

[0099] One of the first needle valve type connecting hot nozzles is correspondingly set on the transverse connecting arm of the flow divider and is located at the connection between the transverse connecting arm and the connecting part; multiple first needle valve type connecting hot nozzles are distributed around the first needle valve type connecting hot nozzle on the two support arms.

[0100] In this application, the connecting section has a main flow channel, and the branch flow section has branch flow channels. The main flow channel and the branch flow channels together form a complete flow distribution channel, allowing the molten plastic to be evenly distributed to each branch flow channel after entering from the injection nozzle, ensuring consistent melt pressure at each cavity gate. The H-shaped flow distribution structure effectively shortens the difference in plastic flow path, reduces the risk of melt stagnation and uneven cooling, avoids warping or surface defects in the molded parts, and improves the quality and consistency of the parts. It is understood that, on the other hand, the first flow divider adopts an integrated structure combining a central strip-shaped connecting section and H-shaped flow dividers at both ends. This construction significantly optimizes the flow path of the molten plastic in the flow channel. The connecting section has a main flow channel that can be directly connected to the injection molding machine's injection nozzle, allowing the molten plastic to enter the branch flow channels of the flow divider quickly and evenly, avoiding stagnation or uneven temperature during flow, improving mold filling stability and product consistency.

[0101] The combination of the two support arms and the transverse connecting arm in the H-shaped flow divider not only provides structural stability but also ensures a reasonable spatial layout of the branch flow channels, which is beneficial for achieving uniform material supply to multiple cavities within a limited mold area. The direct connection between the branch flow channels and the main flow channel allows molten plastic to be rapidly distributed from the center to the gates of each cavity, reducing flow channel pressure loss and lowering the risk of thermal degradation, thus contributing to the molding of high-quality plastic products.

[0102] In this configuration, the arrangement of the first needle valve injection nozzle and the first needle valve connecting nozzle has significant advantages. The first needle valve injection nozzle connects directly to the cavity gate, enabling independent control and precise filling of each cavity. The first needle valve connecting nozzle is positioned on the transverse connecting arm of the manifold and close to the connecting part, which helps shorten the flow path of the molten plastic, reduce the runner length and bending angle, thereby lowering the filling pressure requirement and flow resistance. The needle valve nozzle structure itself can quickly open and close to control the plastic flow direction. Combined with the specific structure of the manifold, it can achieve precise flow control and pressure regulation under different production process conditions, ensuring consistency in simultaneous filling of multiple cavities and product molding quality.

[0103] In summary, the overall structural design of the first manifold not only optimizes the flow distribution and thermal balance of molten plastic, but also achieves controllability, rationality and efficiency of multi-cavity injection molding through the reasonable arrangement of needle valve injection nozzles and connecting nozzles, providing reliable technical support for the stable operation of complex stacked molds or multi-cavity injection molds.

[0104] like Figure 2As shown, in one specific embodiment, the second mold assembly 200 includes a first mold core pad 210, a second manifold support plate 220, and a second mold core pad 230. The first mold core pad 210 is fixedly connected to the second mold core 240, used to support the second mold core 240 and withstand injection pressure, while providing a stable mounting base for the second hot runner system 260.

[0105] In a specific implementation, the first mold core pad 210 is connected to the second mold core 240; the second manifold support plate 220 is connected to the first mold core pad 210, and the second hot runner system 260 is disposed on the second manifold support plate 220; the second mold core pad 230 is connected to the second manifold support plate 220, and the second manifold support plate 220 is located between the first mold core pad 210 and the second mold core pad 230.

[0106] Specifically, the first mold core pad 210 is disposed on and connected to the second manifold support plate 220, and the second hot runner system 260 is disposed on the second manifold support plate 220. The first mold core pad 210 supports the second mold core 240. The second manifold support plate 220, as the core load-bearing structure of the second hot runner system 260, is used to arrange the second hot runner system 260, connect the second needle valve injection nozzle 262 and the second needle valve connecting nozzle 263. A second mold core pad 230 is disposed on the other side of the second manifold support plate 220, connected to the second manifold support plate 220, and supports the third mold core 250. The second manifold support plate 220 is located between the first mold core pad 210 and the second mold core pad 230. This three-layer structure achieves a compact arrangement of the second hot runner system 260, while also facilitating mold disassembly, maintenance, and temperature control management.

[0107] like Figure 3 As shown in this embodiment, the second hot runner system 260 includes a second manifold 261, a plurality of second needle valve injection nozzles 262, and a plurality of second needle valve connecting nozzles 263. The second manifold 261 serves as the core distribution component of the second hot runner system 260, used to uniformly distribute molten plastic to the second cavity or to form a controllable connection with the first hot runner system 140.

[0108] Specifically, the second needle valve type injection nozzle 262 is disposed on the second manifold 261, and the second needle valve type injection nozzle 262 is connected to the second manifold channel inside the second manifold 261; the second needle valve type injection nozzle 262 is connected to the gate of the second cavity. For example, the second needle valve type injection nozzle 262 is disposed on the second manifold 261, its lower end is connected to the gate of the second cavity, and its upper end is connected to the second manifold channel inside the second manifold 261. During the injection molding process, the second needle valve type injection nozzle 262 can precisely control the time and flow rate of molten plastic injected into the second cavity, ensuring the uniformity of injection into the second cavity and the dimensional accuracy of the product, while improving surface quality.

[0109] Specifically, the second needle valve type connecting hot nozzle 263 is disposed on the second manifold 261, and the second needle valve type connecting hot nozzle 263 is connected to the second manifold channel inside the second manifold 261; during mold closing, the second needle valve type connecting hot nozzle 263 connects to the flow channel of the first hot runner system 140. For example, the second needle valve type connecting hot nozzle 263 is also disposed on the second manifold 261 and communicates with the second manifold channel inside the second manifold 261. During mold closing, the second needle valve type connecting hot nozzle 263 can connect to the flow channel of the first hot runner system 140, realizing a continuous flow channel structure between the first hot runner system 140 and the second hot runner system 260. This design can flexibly control the flow direction of molten plastic between the first cavity and the second cavity, providing reliable switching control during multi-cavity injection molding or multi-component injection molding, while ensuring the balance of injection pressure and the stability of runner temperature.

[0110] By integrating the second needle valve injection nozzle with the connecting nozzle on the second manifold, the entire second hot runner system is more compactly arranged, making it easier to disassemble and maintain. At the same time, it improves temperature control accuracy and injection stability, providing reliable technical support for high-precision, multi-cavity, and multi-component continuous injection molding.

[0111] In one embodiment of this invention, the second hot runner system 260 may be provided with multiple independent second manifolds 261, each of which operates as an independent plastic distribution unit. Each independent second manifold 261 is provided with at least one second needle valve injection nozzle 262 for injecting molten plastic into the corresponding second cavity, and is also provided with a separate second needle valve connecting nozzle 263 for forming a controllable connection with the flow channel of the first hot runner system 140 during mold closing.

[0112] For example, this design with multiple second manifolds allows each manifold unit to independently control the injection volume and time. This enables the injection parameters to be adjusted separately for different cavities or product shapes during multi-cavity or multi-component injection molding, thereby ensuring injection uniformity and product precision in each cavity. Simultaneously, the independence of each second manifold facilitates disassembly, cleaning, and maintenance, improving the mold's operability and reliability.

[0113] The second manifold has an overall H-shaped structure, including two spaced-apart support arms and a transverse connecting arm connecting the two support arms. A second needle valve type hot nozzle is correspondingly installed on the transverse connecting arm of the second manifold, and multiple second needle valve type injection hot nozzles are distributed around the second needle valve type hot nozzle on the two support arms of the second manifold.

[0114] In some specific embodiments of this application, the second manifold has an overall H-shaped structure, including two spaced-apart support arms and a transverse connecting arm connecting the two support arms. This structural design allows the second manifold to rationally arrange the flow channels and hot nozzles while ensuring structural strength and rigidity, ensuring uniform distribution and stable flow of molten plastic within the manifold. The support arms provide spatial support for the flow channel layout.

[0115] A second needle valve type connecting hot nozzle is correspondingly set on the transverse connecting arm, located at the center of the H-shaped structure. Multiple second needle valve type connecting hot nozzles are distributed around the central connecting hot nozzle on the two support arms. This layout can shorten the path of molten plastic from the center of the manifold to each cavity, reduce flow resistance and pressure loss, and ensure the balance of filling speed and pressure.

[0116] With this H-shaped manifold structure, the arrangement of the second needle valve injection nozzle and the connecting nozzle enables precise flow control during multi-cavity or stacked mold injection. The needle valve nozzle structure can be quickly opened and closed by a cylinder to control the plastic flow direction. Combined with the support arm and lateral connecting arm of the H-shaped manifold, it allows for flexible switching of flow channels, optimization of mold filling sequence, and reduction of melt residence time in multi-cavity injection molding, which is beneficial to improving product molding quality and consistency.

[0117] In some specific embodiments of this application, the first manifold and the second manifold form a continuous flow channel structure through needle valve-type connecting hot nozzles. The combined design of the two exhibits significant synergistic advantages in multi-cavity and stacked injection molding. The first manifold adopts a strip-shaped and H-shaped combination structure with a central connecting section and two end manifolds. The connecting section contains a main flow channel, and the manifolds contain branch flow channels, forming a uniform first manifold. The second manifold has an overall H-shaped structure, with the transverse connecting arm supporting the central needle valve-type connecting hot nozzle. Multiple needle valve-type connecting hot nozzles are evenly distributed on the two support arms, forming the second manifold.

[0118] Through the above structural combination, the first and second manifolds achieve efficient connection and uniform distribution of molten plastic across the manifold channels. The main channel and branch channels of the first manifold uniformly guide the melt to the central connecting nozzle of the second manifold, where multiple injection nozzles arranged on the support arms of the second manifold further distribute the melt to each cavity. This combination shortens the melt flow path, reduces pressure loss, and ensures balanced filling speed and pressure in each cavity, thereby improving the molding quality and consistency of the injection molded products.

[0119] By setting independent needle valve injection nozzles and needle valve connecting nozzles on each second manifold, the second hot runner system can more flexibly achieve continuous or discontinuous connection with the first hot runner system, making the process of multi-cavity injection molding or multi-component injection molding more controllable, and further improving the efficiency and stability of injection molding production.

[0120] In practical implementation, both the second needle valve injection hot nozzle 262 and the second needle valve connecting hot nozzle 263 adopt the same cylinder-driven needle valve hot nozzle structure as described above. Specifically, both the second needle valve injection hot nozzle 262 and the second needle valve connecting hot nozzle 263 include a needle valve body, a needle rod, a driving cylinder, and a mounting base. The needle valve body has a needle valve hole, and the needle rod slides axially along the needle valve hole. One end of the needle rod controls the opening and closing of the needle valve hole, and the other end is connected to the cylinder piston. When the cylinder piston is pressed and pushed within the cylinder, the needle rod moves along the needle valve hole, thus opening and closing the needle valve. The driving cylinder is mounted on the outer wall of the other side of the second manifold 261.

[0121] The needle valve body is fixed to the second manifold 261 via a mounting base, so that the needle rod end is connected to the second manifold channel inside the second manifold 261. The needle rod end of the second needle valve injection hot nozzle 262 is aligned with the gate of the second cavity to ensure that the molten plastic can be injected into the second cavity through the needle valve; the needle rod end of the second needle valve connecting hot nozzle 263 can be connected to the corresponding flow channel of the first hot runner system 140 when the mold is closed to form a continuous flow channel structure.

[0122] In the specific installation structure, the needle valve body is fixed to the second diverter plate 220 by threads or positioning pins, and the drive cylinder is fixed to the other side surface of the second diverter plate 220 by threads or brackets, located above the needle valve body. The piston movement of the cylinder precisely controls the opening and closing of the needle rod along the needle valve axis to realize the opening and closing switching of the flow channel.

[0123] In one specific embodiment, in order to meet the injection material supply requirements of the first cavity and the second cavity in the stacked mold, the installation direction of various hot nozzles is set accordingly.

[0124] Specifically, the first needle valve injection hot nozzle and the first needle valve connecting hot nozzle, which are disposed on the first manifold plate, have the same orientation. The first needle valve injection hot nozzle is positioned towards the gate direction of the first cavity to inject molten injection material into the first cavity; while the first needle valve connecting hot nozzle is positioned towards the second mold assembly to form a connection with the second hot runner assembly when the mold is closed, thereby realizing the flow channel connection.

[0125] Accordingly, in the second hot runner system, the second needle valve injection nozzle and the second needle valve connecting nozzle are oriented in opposite directions. The second needle valve injection nozzle is oriented towards the gate of the second cavity to deliver molten injection material into the second cavity; while the second needle valve connecting nozzle is oriented towards the first mold assembly to correspond with the first needle valve connecting nozzle of the first hot runner assembly when the mold is closed.

[0126] Furthermore, the first needle valve type connecting hot nozzle and the second needle valve type connecting hot nozzle are oriented opposite to each other. When the stacked mold is closed, the two can be connected to each other in the axial direction, so that the flow channels of the first hot runner system and the flow channels of the second hot runner system form a connected structure, allowing the molten injection material to be transferred between the two hot runner components to meet the injection molding requirements of the multi-layer cavity of the stacked mold.

[0127] like Figure 2 As shown, the injection mold 10 also includes a load-bearing structure 270, which is connected to the second mold assembly 200 and is configured to fix the second mold assembly 200 to the frame or moving mechanism of the injection molding machine.

[0128] In this specific embodiment, the injection mold 10 further includes a load-bearing structure 270, which is fixedly connected to the second mold assembly 200. The load-bearing structure 270 can be a frame or support plate made of steel or aluminum alloy, and its shape and size are designed according to the overall weight and stress of the second mold assembly 200 to ensure the stability of the mold during injection molding. The load-bearing structure 270 is connected to the second mold assembly 200 by bolts or pins, and the other end of the load-bearing structure 270 is fixedly connected to the frame or moving mechanism of the injection molding machine, thereby reliably supporting the second mold assembly 200 on the injection molding machine.

[0129] The load-bearing structure is designed to take into account the effects of mold opening and closing forces and injection pressure during injection molding, ensuring that the second mold assembly maintains positioning accuracy in both closed and open states. This prevents misalignment of the cavity gate or overflow of molten plastic due to mold displacement, and provides stable docking support for the continuous runner structure of the first and second hot runner systems. The fixed connection method of the load-bearing structure can be selected as adjustable support or fixed support, depending on the type of injection molding machine and the weight of the mold, to facilitate operation during mold installation, maintenance, and replacement.

[0130] In one specific implementation, the load-bearing structure 270 includes a support plate, two bases, and a fixing block. The support plate is used to connect the frame or moving mechanism of the injection molding machine, and its material can be steel or aluminum alloy, having sufficient strength and rigidity to withstand the overall weight of the second mold assembly 200 and the hot runner system.

[0131] Specifically, two bases are connected to the support plate and are spaced apart on both sides of the support plate surface to support the lateral forces on the second mold assembly 200. Each base is equipped with an adjustment pad to adjust the height and horizontal position of the second mold assembly 200 to ensure the positioning accuracy of the mold in the mold-closed and mold-open states, and to adapt to the installation dimensions and mechanical errors of the injection molding machine.

[0132] Specifically, two fixing blocks are respectively connected to two bases. The fixing blocks are fastened to the bases by bolts and are used to bolt the stacked second mold assembly 200, including a first mold core pad 210, a second manifold support plate 220, and a second mold core pad 230. Through the connection of the fixing blocks, the second mold assembly 200 can be stably fixed on the load-bearing structure 270, thereby ensuring accurate alignment between the continuous runner structure of the hot runner system and the cavity gate during injection molding, and preventing cavity displacement or melt overflow due to vibration or uneven force.

[0133] The overall design of the load-bearing structure 270 fully considers the injection pressure, mold opening and closing force and thermal expansion during the injection molding process. At the same time, it provides operating space and adjustment means to facilitate mold installation, maintenance and replacement, ensuring the stability and safety of the injection mold 10.

[0134] In some specific embodiments, the third mold assembly 300 includes a base plate and a fourth mold core 310 fixedly connected to the base plate, the fourth mold core 310 being provided with a coolant channel.

[0135] In some specific embodiments, in order to ensure the stability of the injection molding process and the quality of the molded product, auxiliary mechanisms such as venting systems, cooling systems and ejection systems can be provided on the first mold core 130 or the second mold core 240 that forms the first cavity, and on the third mold core 250 or the fourth mold core 310 that forms the second cavity, so as to meet the functional requirements of the injection mold 10 in the filling, cooling and demolding processes.

[0136] Specifically, regarding the venting structure, venting grooves or venting holes can be provided at the parting surface of the first mold core 130, the second mold core 240, the third mold core 250, or the fourth mold core 310, at the end of the cavity, or at the end of the molten plastic flow. When the molten plastic enters the cavity for mold filling, the air and volatile gases originally inside the cavity can be discharged through the venting grooves or venting holes, thereby avoiding the formation of molding defects such as cavitation, scorching, or short shots due to gas retention in the cavity. Venting grooves are usually located at the parting surface, and their depth can be designed according to the plastic material used and the injection molding process parameters to ensure effective venting without causing molten plastic to overflow.

[0137] Regarding the cooling structure, coolant channels can be provided inside the first mold core 130, second mold core 240, third mold core 250, or fourth mold core 310. These coolant channels can be used to circulate cooling water or other cooling media to control the temperature of the mold cores. During injection molding, the molten plastic gradually cools and solidifies after entering the cavity. The circulating cooling media in the coolant channels accelerates the uniform heat dissipation of the mold temperature, thereby shortening the cooling time of the product and improving production efficiency. Simultaneously, by rationally arranging the position and direction of the coolant channels, the shrinkage difference of the product during cooling can be reduced, improving the dimensional accuracy of the product and reducing warpage.

[0138] Regarding the ejection structure, ejector pins, ejector plates, ejector blocks, or push rods can be installed on the first mold core 130, the second mold core 240, the third mold core 250, or the fourth mold core 310. After the mold opens, the ejection mechanism, driven by the injection molding machine's ejection mechanism, ejects the molded plastic product from the corresponding cavity, thus achieving smooth demolding. The arrangement of the ejection mechanism is usually designed according to the product's structural shape and stress conditions, ensuring that the ejection force is evenly applied to the product, avoiding deformation or damage caused by excessive local stress.

[0139] By providing the aforementioned venting system, cooling system, and ejection system on each mold core forming the first and second cavities, the stacked injection mold 10 can maintain a good working condition in all stages, such as filling, cooling, and demolding, thereby ensuring the molding quality of the product and improving injection molding production efficiency.

[0140] like Figure 4As shown in the illustration, this application embodiment also provides an injection molding equipment 20, which is equipped with the aforementioned injection mold 10. This enables injection molding production of multi-cavity, multi-layered structures. The injection molding equipment 20 may include an injection molding machine body and an injection mold 10 mounted on the machine body. The machine body mainly includes a frame, a mold closing mechanism 21, an injection mechanism, and a control system, among other structures. These structures cooperate to complete the mold opening, mold closing, and injection molding process of molten plastic.

[0141] Specifically, the frame supports the entire injection molding equipment and provides a mounting base for the clamping mechanism, injection mechanism, and mold components. The clamping mechanism, mounted on the frame, includes a fixed platen, a moving platen, and a drive unit. The drive unit can be a hydraulic drive, an electric servo drive, or a mechanical linkage drive, configured to drive the moving platen to reciprocate in a predetermined direction, thereby realizing the mold opening and closing actions of the injection mold. The fixed platen is typically fixedly connected to one side of the frame, while the moving platen can move relative to the fixed platen under the drive of the drive unit.

[0142] Regarding mold installation, the first mold assembly 100 can be fixedly installed on the fixed template of the injection molding machine, thereby maintaining relative fixation during the injection molding process; the third mold assembly 300 can be fixedly installed on the moving template of the injection molding machine, and moves with the moving template during mold opening or closing; the second mold assembly 200 is located between the first mold assembly 100 and the third mold assembly 300, and is connected to other moving components 211 of the mold closing mechanism 21 of the injection molding machine through the load-bearing structure 270, so as to provide stable support and movement function for the second mold assembly 200. Through the above arrangement, the first mold assembly 100, the second mold assembly 200, and the third mold assembly 300 can be sequentially attached and formed into a stacked structure when the mold is closed, wherein the first mold core 130 and the second mold core 240 enclose to form a first cavity, and the third mold core 250 and the fourth mold core 310 enclose to form a second cavity, thereby realizing multi-cavity stacked injection molding.

[0143] Specifically, the moving component 211 can be a combination of a linear guide rail and a slider. The load-bearing structure 270 is connected to the slider connected to the linear guide rail, and the linear guide rail drives the load-bearing structure 270 to move, thereby driving the second mold assembly 200 to move.

[0144] Specifically, the injection mechanism is located on one side of the fixed template. The injection mechanism includes a barrel, screw, and nozzle. The barrel heats and melts the plastic raw material, the screw conveys and pressurizes the molten plastic, and the nozzle injects the molten plastic into the mold. The nozzle is connected to the first hot runner system 140 in the first mold assembly 100, allowing the molten plastic to enter the first runner inside the first manifold 141 and then enter the first cavity for injection molding through the first needle valve injection nozzle 142. When needed, by controlling the opening state of the first needle valve connecting nozzle 143 and the second needle valve connecting nozzle 263, the first hot runner system 140 and the second hot runner system 260 are connected, allowing some of the molten plastic to continue flowing into the second hot runner system 260 and then entering the second cavity for injection molding through the second needle valve injection nozzle 262.

[0145] During operation, when the injection molding equipment 20 is in the mold-closing state, the mold-closing mechanism 21 drives the moving template and moving component 211 to move towards the fixed template, causing the first mold assembly 100, the second mold assembly 200, and the third mold assembly 300 to sequentially fit together and form a complete cavity structure. Subsequently, the injection mechanism injects molten plastic through the nozzle into the first hot runner system 140, and through each needle valve type hot nozzle into the corresponding cavity to complete the injection molding. When only the first cavity needs to be injected, the first needle valve type connecting hot nozzle 143 or the second needle valve type connecting hot nozzle 263 can be controlled to be closed to block the connection between the first hot runner system 140 and the second hot runner system 260; when both the first and second cavities need to be injected simultaneously, the corresponding needle valve type connecting hot nozzle can be controlled to open, allowing the two-stage hot runner systems to form a continuous flow channel structure, thereby achieving synchronous injection of the two cavities.

[0146] Through the above structural design, the injection molding equipment 20 can form a stable assembly relationship with the stacked injection mold 10 described in this application, ensuring the reliability of mold installation while realizing injection molding production of multi-cavity stacked structures. This structure not only increases the output per unit time but also allows for flexible control of the injection state of different cavities according to production needs, thereby improving the flexibility and stability of mold production and further enhancing the overall production efficiency and equipment utilization rate of the injection molding equipment 20.

[0147] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, it will be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection mold, characterized in that, It includes a first mold assembly, a second mold assembly, and a third mold assembly that are stacked sequentially and can open and close relative to each other; The first mold assembly includes a first mold core, the second mold assembly includes a second mold core and a third mold core, and the third mold assembly includes a fourth mold core; The first mold core and the second mold core close together to form a first cavity for injection molding; the third mold core and the fourth mold core close together to form a second cavity for injection molding; the first cavity and the second cavity have completely different cavity structures to mass-produce injection molded parts with different structures; The first mold assembly has a first hot runner system, which is connected to an injection molding machine. The runner of the first hot runner system is connected to the gate of the first cavity. The first hot runner system includes a first manifold, and a plurality of first needle valve injection hot nozzles and a plurality of first needle valve connecting hot nozzles connected to the first manifold. The second mold assembly has a second hot runner system, the runners of which are connected to the gate of the second cavity. The second hot runner system includes multiple independent second manifolds, several second needle valve injection nozzles, and several second needle valve connecting nozzles; and each independent second manifold is equipped with a separate second needle valve connecting nozzle. The second manifold has an overall H-shaped structure, including two support arms spaced apart from each other and a transverse connecting arm connecting the two support arms; a second needle valve type connecting hot nozzle is correspondingly set on the transverse connecting arm of the second manifold, and multiple second needle valve type injection hot nozzles are distributed around the second needle valve type connecting hot nozzle on the two support arms of the second manifold. Specifically, during mold closing, the flow channels of the first hot runner system and the flow channels of the second hot runner system are connected to form a continuous flow channel structure. In particular, during mold closing, the first needle valve type connecting hot nozzle is connected to the corresponding second needle valve type connecting hot nozzle, so that the flow channels of the first hot runner system and the flow channels of the second hot runner system are connected.

2. The injection mold according to claim 1, characterized in that: The first needle valve injection hot nozzle is connected to the first flow channel inside the first flow divider plate; the first needle valve injection hot nozzle is connected to the gate of the first cavity; The first needle valve type hot nozzle is connected to the first flow channel inside the first flow divider plate; when the mold is closed, the first needle valve type hot nozzle is connected to the flow channel of the second hot runner system.

3. The injection mold according to claim 2, characterized in that, The first mold assembly includes: panel; A first manifold support plate is connected to the panel, and the first hot runner system is disposed on the first manifold support plate. The first mold core is connected to the distributor plate support plate, and the first mold core is provided with a coolant channel.

4. The injection mold according to claim 1, characterized in that: The second needle valve injection hot nozzle is connected to the second flow channel inside the second manifold; the second needle valve injection hot nozzle is connected to the gate of the second cavity; The second needle valve type hot nozzle is connected to the second flow channel inside the second flow divider plate; when the mold is closed, the second needle valve type hot nozzle is connected to the flow channel of the first hot runner system.

5. The injection mold according to claim 4, characterized in that, The second mold assembly includes: First mold core pad, the first mold core pad is connected to the second mold core; The second manifold support plate is connected to the first mold core pad plate, and the second hot runner system is disposed on the second manifold support plate. The second mold core pad is connected to the second manifold support plate, and the second manifold support plate is located between the first mold core pad and the second mold core pad.

6. The injection mold according to claim 1, characterized in that, Also includes: A load-bearing structure connected to the second mold assembly, the load-bearing structure being configured to fix the second mold assembly to the frame or moving mechanism of the injection molding machine.

7. An injection mold according to claim 6, characterized in that, The load-bearing structure includes: Support plate, the support plate being used to connect the frame or moving mechanism of the injection molding machine; Two bases are connected to the support plate, and the two bases are respectively located at a distance on both sides of the surface of the support plate; each base is connected to an adjusting pad. Two fixing blocks are respectively connected to the two bases, and the fixing blocks are bolted to the stacked first mold core pad, second diversion plate support plate and second mold core pad.

8. An injection molding machine, characterized in that, The injection molding equipment is equipped with an injection mold as described in any one of claims 1-7.

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