Needle valve type precise injection mold for hot runner

Abstract

The utility model discloses a hot runner needle valve type precise injection mold, which relates to the technical field of plastic forming processing and comprises a shunting block, two hot nozzles are arranged above the shunting block, the lower surfaces of the two hot nozzles are movably sleeved with extension pipes, the upper surface of the shunting block is rotatably connected with a screw rod, the lower surfaces of the two extension pipes are fixedly connected with connecting rings, and the connecting rings are fixedly connected with the screw rod. The two hot nozzles are movably connected to the two extension pipes in a sleeving mode, the lengths of the hot nozzles are adjusted by moving the connecting plate, different injection molds are different in design and size, the hot runner system can be better matched with various mold structures due to the fact that the lengths of the hot nozzles are adjustable, and the hot runner system can be better matched with various mold structures. By adjusting the length of the hot nozzle, the plastic melt can be accurately conveyed to a specific position of the mold, so that a reasonable flowing path of the melt in the mold is ensured, and the condition that the melt flows unevenly or a cavity cannot be filled is avoided.

Description

A hot runner needle valve type precision injection mold Technical Field

[0001] This utility model relates to the field of plastic molding and processing technology, and in particular to a hot runner needle valve type precision injection mold. Background Technology

[0002] Hot runner needle valve precision injection molds, as key equipment in the injection molding field, are widely used in the production of high-requirement products such as automotive parts, electronic precision components, and medical consumables due to their excellent molding precision and product quality control capabilities. In practical applications, hot runner needle valve precision injection molds typically include the following key components:

[0003] 1. Hot runner system: Maintains the molten state of the plastic melt during the injection molding process and ensures stable melt delivery.

[0004] 2. Needle valve assembly: By precisely controlling the opening and closing of the gate, it achieves precise control over the injection volume and time of the plastic melt.

[0005] 3. Mold cavity: It determines the shape and size of the plastic product and plays a decisive role in the molding quality.

[0006] 4. Temperature control system: Ensures stable temperature of the hot runner system and all parts of the mold, guaranteeing the stability of the injection molding process.

[0007] Currently, to meet diverse injection molding production needs, mold manufacturers have adopted various design and manufacturing solutions. Some manufacturers use standardized mold structures, which have the advantages of low cost and short production cycle; others offer customized molds, which can be personalized according to customers' specific needs, providing more suitable solutions; still others develop modular molds, which can achieve the purpose of quickly adjusting the mold structure by flexibly combining different modules.

[0008] However, the above-described implementation methods still have the following problems. Regarding mold structure adaptation, standardized molds are difficult to meet the needs of special cavity layouts and molds of different sizes. While customized molds can solve the adaptation problem, they are costly and have long development cycles. Regarding ensuring the purity of the plastic melt, existing molds lack an effective impurity filtration mechanism. Impurities in the plastic melt may lead to product defects, dimensional deviations, and other problems, affecting product quality. This application proposes a solution to this problem: designing a hot runner needle valve type precision injection mold. This mold can flexibly adapt to different mold structures, and by equipping it with a filter screen device that facilitates filter membrane replacement, it effectively ensures the filtration effect of the plastic melt and improves product quality. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this utility model provides a hot runner needle valve type precision injection mold, which solves the problem that standardized molds cannot meet the needs of special cavity layouts and molds of different sizes. Although customized molds can solve the adaptation problem, they are costly and have long development cycles. In terms of ensuring the purity of plastic melt, existing molds lack an effective impurity filtration mechanism, and impurities in plastic melt may cause product defects and dimensional deviations.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A hot runner needle valve type precision injection mold includes a manifold block, two hot nozzles are arranged above the manifold block, extension tubes are movably sleeved on the lower surfaces of the two hot nozzles, a lead screw is rotatably connected to the upper surface of the manifold block, connecting rings are fixedly connected to the lower surfaces of the two extension tubes, two connecting seats are fixedly connected to the upper surface of the manifold block, a fixed seat is arranged in the two connecting seats, a filter membrane is arranged in the two fixed seats, a connecting plate is arranged above the manifold block, and a fixed ring is fixedly connected to the annular side of the two hot nozzles, and the two fixed rings are fixedly connected to the connecting plate.

[0012] Preferably, the connecting plate is threadedly connected to the lead screw, and the lower surfaces of both connecting rings are fixedly connected with threaded rings.

[0013] Preferably, the two threaded rings are threadedly connected to the two fixed seats respectively, and a filter screen is provided inside each of the two connecting rings.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Two hot nozzles are movably connected to two extension tubes. The length of the hot nozzles is adjusted by moving the connecting plate. Different injection molds have differences in design and size. Adjustable hot nozzle length can make the hot runner system better match various mold structures. For some molds with special cavity layouts or deep cavities, the length of the hot nozzles can be adjusted to accurately deliver the plastic melt to a specific position in the mold, ensuring a reasonable flow path of the melt in the mold and avoiding uneven flow or failure to fill the cavity.

[0016] 2. When the filter membrane needs to be replaced, remove the hot nozzle and rotate the extension tube to drive the fixed connecting ring to rotate together. As the connecting ring rotates upward, it will drive the fixed threaded ring to rotate together. At this time, the threaded ring will disengage from the fixed seat set in the connecting seat, opening the limit, and the filter membrane can be disassembled. The operation is convenient and the design allows for timely replacement of clogged or damaged filter membranes, ensuring that the whole system always maintains good filtration performance and ensuring that the filtered substances meet the specified purity and quality standards. Attached Figure Description

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0018] Figure 1 is an overall structural diagram of this utility model;

[0019] Figure 2 is an exploded view of the overall structure of this utility model;

[0020] Figure 3 is a structural diagram of the thermal nozzle of this utility model;

[0021] Figure 4 is a structural diagram of the connecting ring of this utility model.

[0022] Legend: 1. Diverter block; 2. Connecting seat; 3. Extension tube; 4. Hot nozzle; 5. Lead screw; 6. Connecting plate; 7. Fixing ring; 8. Connecting ring; 9. Filter membrane; 10. Fixing seat; 11. Threaded ring; 12. Filter screen. Detailed Implementation

[0023] This application provides a hot runner needle valve precision injection mold, which effectively solves the problem that standardized molds cannot meet the needs of special cavity layouts and molds of different sizes. Although customized molds can solve the adaptation problem, they are costly and have long development cycles. In terms of ensuring the purity of plastic melt, existing molds lack an effective impurity filtration mechanism. Impurities in plastic melt may cause product defects and dimensional deviations. This application designs a hot runner needle valve precision injection mold that can flexibly adapt to different mold structures. At the same time, by equipping a filter screen device that is easy to replace the filter membrane, it effectively ensures the filtration effect of plastic melt and improves product quality.

[0024] Example

[0025] As shown in Figures 1, 2, 3, and 4, the technical solution in this application effectively solves the problem that standardized molds cannot meet the needs of special cavity layouts and molds of different sizes. While customized molds can solve the adaptation problem, they are costly and have long development cycles. Regarding the purity of plastic melt, existing molds lack an effective impurity filtration mechanism, and impurities in the plastic melt may lead to product defects and dimensional deviations. The overall approach is as follows:

[0026] To address the problems existing in the prior art, this utility model provides a hot runner needle valve type precision injection mold, including a manifold block 1. Two hot nozzles 4 are disposed above the manifold block 1, and extension tubes 3 are movably sleeved on the lower surfaces of both hot nozzles 4. A lead screw 5 is rotatably connected to the upper surface of the manifold block 1, and connecting rings 8 are fixedly connected to the lower surfaces of both extension tubes 3. Two connecting seats 2 are fixedly connected to the upper surface of the manifold block 1, and fixing seats 10 are disposed within each of the two connecting seats 2. A filter membrane 9 is disposed within each of the two fixing seats 10. A connecting plate 6 is disposed above the manifold block 1, and fixing rings 7 are fixedly connected to the annular sides of both hot nozzles 4. Both fixing rings 7 are fixedly connected to the connecting plate 6. In injection molding production, during the preparation stage, the temperature control box heats the hot runner system using thermocouple feedback signals to ensure that the temperature of the manifold block 1 and the hot nozzles 4 is suitable, maintaining good melt flowability. During the injection stage, the injection molding machine melts the plastic... The melt is fed into the hot runner and distributed to the hot nozzles 4 via the distributor block 1. At the same time, an injection signal is sent to control the cylinder or hydraulic cylinder to open the needle valve, allowing the melt to be injected into the cavity. During use, the connecting plate 6 sleeved on the screw 5 moves due to the thread action. The movement of the connecting plate 6 will move the two hot nozzles 4 together. The two hot nozzles 4 are movably sleeved on the two extension tubes 3. The length of the hot nozzles 4 can be adjusted by moving the connecting plate 6. Different injection molds have differences in design and size. The adjustable length of the hot nozzles 4 can make the hot runner system better match various mold structures. For some molds with special cavity layouts or deep cavities, the length of the hot nozzles 4 can be adjusted to accurately deliver the plastic melt to a specific position in the mold, ensuring a reasonable flow path of the melt in the mold and avoiding uneven flow or failure to fill the cavity.

[0027] The connecting plate 6 is threadedly connected to the lead screw 5. Threaded rings 11 are fixedly connected to the lower surfaces of both connecting rings 8. The two threaded rings 11 are threadedly connected to the two fixed seats 10 respectively. Filter screens 12 are installed inside both connecting rings 8. During the process of the plastic melt being fed into the hot runner, it will be filtered through the fixed seats 10, filter membrane 9, and filter screens 12 to intercept impurities and unmelted particles in the plastic melt. The fixed seats 10, filter membrane 9, and filter screens 12 are all made of stainless steel. When the filter membrane 9 needs to be replaced, the hot nozzle 4 is removed, and the fixed connecting ring 8 is rotated by rotating the extension tube 3. As the connecting ring 8 rotates upwards, it will drive the fixed threaded ring 11 to rotate as well. At this time, the threaded ring 11 will disengage from the fixed seat 10 inside the connecting seat 2, opening the limit switch, and the filter membrane 9 can be disassembled. The convenient operation and easy replacement design allow for timely replacement of clogged or damaged filter membranes 9, ensuring that the overall system maintains good filtration performance and that the filtered material meets the specified purity and quality standards.

[0028] Among them, the flow divider 1 is a key component of the hot runner system, which is responsible for evenly distributing the plastic melt sent from the injection molding machine to the hot nozzles 4, ensuring balanced feeding of each hot nozzle 4, and ensuring a stable injection process.

[0029] Connecting seat 2: Fixed on the diverter block 1, used to install the fixing seat 10, providing an installation position for the filter membrane 9, and playing a supporting and positioning role in the filtration system;

[0030] Extension tube 3: It is sleeved on the lower surface of the hot nozzle 4 and, together with the lead screw 5 and the connecting plate 6, adjusts the length of the hot nozzle 4 so that the hot nozzle 4 can adapt to different mold structures.

[0031] Hot nozzle 4: Injects the molten plastic from the hot runner into the mold cavity. Its length is adjustable, which can precisely control the injection position and amount of the melt, affecting the molding quality of the plastic part.

[0032] Lead screw 5: When rotating, it drives the connecting plate 6 to move through the thread, thereby adjusting the length of the hot nozzle 4 and realizing the adaptation of the hot runner system to different mold structures;

[0033] Connecting plate 6: It is threadedly connected to lead screw 5. When it moves, it drives the hot nozzle 4 to move together. It is an important transmission component for adjusting the length of hot nozzle 4 and ensures synchronous adjustment.

[0034] Fixing ring 7: Fixed to the annular side of the hot nozzle 4 and connected to the connecting plate 6, ensuring the stability of the hot nozzle 4 during movement, so that the hot nozzle 4 moves synchronously with the connecting plate 6;

[0035] Connecting ring 8: connects extension tube 3 and fixed base 10, and has a filter screen 12 inside. While filtering impurities, it works with threaded ring 11 to make the filter membrane 9 easy to replace.

[0036] Filter membrane 9: Installed in the fixed base 10, it is used to filter impurities and unmelted particles in the plastic melt, ensuring the purity of the melt and improving the quality of the plastic parts;

[0037] Fixing base 10: Installed inside the connecting base 2, it fixes the filter membrane 9, provides a stable installation environment for the filter membrane 9, and ensures stable filtration effect;

[0038] Threaded ring 11: Connected to the lower surface of the connecting ring 8 and threadedly connected to the fixed seat 10. When replacing the filter membrane 9, the connecting ring 8 is separated from the fixed seat 10 by rotation.

[0039] Filter 12: Located inside the connecting ring 8, it initially filters the plastic melt and works in conjunction with the filter membrane 9 to further improve the filtration effect of the melt.

[0040] Working principle:

[0041] In injection molding production, during the preparation stage, the temperature control box heats the hot runner system using thermocouple feedback signals to ensure suitable temperatures for the manifold 1 and hot nozzles 4, maintaining good melt flow. During the injection stage, the injection molding machine delivers the molten plastic into the hot runner, distributes it to the hot nozzles 4 via the manifold 1, and simultaneously sends an injection signal to control a cylinder or hydraulic cylinder to open the needle valve, allowing the melt to be injected into the mold cavity. During operation, rotating the lead screw 5 causes the connecting plate 6, which is threaded, to move. This movement of the connecting plate 6 moves the two hot nozzles 4 together. The two hot nozzles 4 are movably connected to two extension tubes 3. The length of the hot nozzles 4 is adjusted by moving the connecting plate 6. Different injection molds have different designs and dimensions; adjustable hot nozzle length allows the hot runner system to better match various mold structures. For molds with special cavity layouts or deep cavities, adjusting the length of the hot nozzles 4 allows for accurate... The system delivers the molten plastic to a specific location in the mold, ensuring a reasonable flow path and preventing uneven flow or incomplete filling of the cavity. During its entry into the hot runner, the molten plastic is filtered through the fixed seat 10, filter membrane 9, and filter screen 12, intercepting impurities and unmelted particles. The fixed seat 10, filter membrane 9, and filter screen 12 are all made of stainless steel. When the filter membrane 9 needs replacement, the hot nozzle 4 is removed, and the extension tube 3 rotates, causing the fixed connecting ring 8 to rotate as well. As the connecting ring 8 rotates upwards, it causes the fixed threaded ring 11 to rotate as well. At this point, the threaded ring 11 disengages from the fixed seat 10 within the connecting seat 2, opening the limit switch, allowing the filter membrane 9 to be disassembled. This convenient and easy-to-replace design allows for timely replacement of clogged or damaged filter membranes 9, ensuring consistently good filtration performance and guaranteeing that the filtered material meets the specified purity and quality standards.

[0042] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A hot runner needle valve type precision injection mold, comprising a manifold block (1), characterized in that, Two hot nozzles (4) are provided above the diversion block (1). An extension tube (3) is movably sleeved on the lower surface of each of the two hot nozzles (4). A lead screw (5) is rotatably connected to the upper surface of the diversion block (1). A connecting ring (8) is fixedly connected to the lower surface of each of the two extension tubes (3). Two connecting seats (2) are fixedly connected to the upper surface of the diversion block (1). A fixing seat (10) is provided in each of the two connecting seats (2). A filter membrane (9) is provided in each of the two fixing seats (10). A connecting plate (6) is provided above the diversion block (1).

2. The hot runner needle valve type precision injection mold as described in claim 1, characterized in that: Both of the two hot nozzles (4) have a fixed ring (7) fixedly connected to their annular sides; wherein both of the fixed rings (7) are fixedly connected to the connecting plate (6).

3. A hot runner needle valve type precision injection mold as described in claim 1, characterized in that: The connecting plate (6) is threadedly connected to the lead screw (5).

4. A hot runner needle valve type precision injection mold as described in claim 1, characterized in that: Both connecting rings (8) have threaded rings (11) fixedly connected to their lower surfaces.

5. A hot runner needle valve type precision injection mold as described in claim 4, characterized in that: The two threaded rings (11) are threadedly connected to the two fixed seats (10) respectively.

6. A hot runner needle valve type precision injection mold as described in claim 1, characterized in that: Both of the connecting rings (8) are provided with filters (12).

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