A nozzle structure for cold runner

Abstract

The utility model relates to a nozzle technical field especially, it relates to a nozzle structure for cold runner. Its technical scheme includes: the connecting cap is equipped with the threaded joint for installing the nozzle at the bottom, the limiting pipe in the inside of connecting cap, the limiting pipe lateral wall is equipped with the feed inlet, and its inner chamber passes through spring installation has the seal plate of axial movement, and the nozzle of detachable installation in threaded joint, its inside is equipped with the support frame, wherein, when the nozzle is installed in place, the support frame pushes the connecting rod axial displacement, makes the seal plate compression spring and moves up to the feed inlet above, opens material passage, when the nozzle is dismantled, the seal plate is under the action of spring restoring force and material pressure and moves down, and the discharge port of limiting pipe is blocked. The utility model realizes the automatic opening and closing of material passage when the nozzle is disassembled, effectively prevents material leakage, and improves the convenience and safety of use.

Description

Technical Field

[0001] This utility model relates to the field of nozzle technology, specifically to a nozzle structure for cold runners. Background Technology

[0002] In injection molding, cold runner technology, as a key material transport and molding aid, is widely used in the production of various plastic products. The main function of the cold runner system is to precisely and stably transport the molten plastic from the injection molding machine's molten chamber to the mold cavity, achieving efficient and high-quality injection molding. Among these components, the nozzle structure is one of the core components of the cold runner system, and its performance directly affects the stability of the entire injection molding process, product quality, and production costs.

[0003] In traditional cold runner nozzle designs, material leakage from the outlet of the limiting tube often occurs during nozzle disassembly operations, such as replacing nozzles of different specifications to meet the production needs of different products, or during routine maintenance and repair of the equipment. This is due to a flaw in the sealing design of traditional nozzle structures. At the moment of nozzle disassembly, material inside the limiting tube, due to its own pressure and the lack of an effective seal, flows out uncontrollably from the outlet. The leaked material cannot be recycled for injection molding, resulting in direct waste of raw materials. For some expensive engineering plastics or specialty plastics, this waste significantly increases production costs and reduces the company's economic benefits. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a nozzle structure for cold runners, which solves the problems mentioned in the background art.

[0005] The solution to the above-mentioned technical problems provided by this utility model is as follows:

[0006] A nozzle structure for cold runners includes:

[0007] The connecting cap has a threaded connector at its bottom for mounting a nozzle;

[0008] A limiting tube is located inside the connecting cap. The limiting tube has a feed port on its side wall, and a sealing plate that can move axially is installed in its inner cavity by a spring.

[0009] And a nozzle that can be detachably installed on a threaded connector, with an internal support frame;

[0010] When the nozzle is installed in place, the support frame pushes the connecting rod to move axially, causing the sealing plate to compress the spring and move upward above the feed inlet, thus opening the material channel;

[0011] When the nozzle is disassembled, the sealing plate moves downward under the action of spring return force and material pressure, blocking the outlet of the limiting tube.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, the top of the connecting cap is provided with a threaded structure for connection with the injection molding machine.

[0014] The beneficial effects of adopting the above-mentioned further solutions are:

[0015] This design makes connecting and disconnecting the connector cap from the injection molding machine extremely convenient. Using the common and proven threaded connection method, the connector cap can be quickly and securely installed onto the injection molding machine, significantly reducing equipment assembly time and improving production preparation efficiency. Simultaneously, the threaded connection provides excellent sealing, effectively preventing material leakage at the connection point, ensuring the stability of the injection molding process and product quality, and reducing cleanup work and material waste caused by leakage. Furthermore, when the equipment requires maintenance or component replacement, the connector cap can be easily and quickly removed from the injection molding machine, reducing maintenance and time costs.

[0016] Furthermore, the limiting tube has a conical structure, and its inner cavity forms a material flow channel.

[0017] The beneficial effects of adopting the above-mentioned further solutions are:

[0018] The conical structure of the limiting tube offers several advantages. Firstly, in terms of material flow, the conical structure guides and accelerates the flow. Material enters from the larger diameter end, and as the channel gradually narrows, the flow velocity increases accordingly. This facilitates smoother and faster passage of material through the limiting tube, reducing the residence time within the tube and mitigating the risk of degradation or deterioration due to prolonged heating, thereby improving the quality of injection-molded products. Secondly, the conical structure provides a degree of tolerance during manufacturing and installation. Even with some dimensional deviations, it can ensure the smooth flow of material to a certain extent, improving the reliability and stability of the equipment. Furthermore, when subjected to material pressure, this structure can distribute pressure more evenly, enhancing the overall strength of the limiting tube and extending its service life.

[0019] Furthermore, the sealing plate forms a linkage mechanism with the support frame via a connecting rod, and the axial movement of the support frame drives the connecting rod to move the sealing plate.

[0020] The beneficial effects of adopting the above-mentioned further solutions are:

[0021] This linkage mechanism is ingeniously designed and practical. Through this linkage, the movement of the sealing plate is automatically synchronized with the installation and removal of the nozzle. During nozzle installation, the axial movement of the support frame is precisely transmitted to the sealing plate via the connecting rod, causing the sealing plate to move according to predetermined requirements and open the material channel, eliminating the need for manual intervention and improving operational convenience and accuracy. Similarly, during nozzle removal, the linkage mechanism ensures that the sealing plate promptly and accurately seals the outlet, preventing material leakage. This automated linkage mechanism reduces the impact of human factors on equipment operation, lowers the probability of operational errors, and improves the overall efficiency and reliability of the nozzle structure, making it particularly suitable for large-scale, continuous injection molding production environments.

[0022] Furthermore, the feed inlet is evenly distributed along the circumference of the limiting tube and is located above the initial sealing position of the sealing plate.

[0023] The beneficial effects of adopting the above-mentioned further solutions are:

[0024] The design of the feed inlet being evenly distributed circumferentially along the limiting tube has significant advantages. It allows material to enter the limiting tube cavity uniformly from multiple directions, avoiding the problems of excessive local pressure or uneven material flow caused by material concentrating in one direction. Uniform material inflow helps ensure stable material flow within the channel, reducing the generation of eddies and turbulence, thereby reducing energy loss during material flow and improving material conveying efficiency. Simultaneously, this design allows for better material filling of the mold, improving the density and uniformity of the injection-molded product and enhancing product quality. Furthermore, placing the feed inlet above the initial sealing position of the sealing plate ensures that the channel below the feed inlet is effectively sealed when the sealing plate is in its initial state, preventing material leakage during non-operational periods. When the channel needs to be opened, the sealing plate can smoothly move upwards, allowing material to enter the limiting tube through the feed inlet, ensuring the reliability and stability of the equipment operation.

[0025] Furthermore, the spring is normally in a compressed state, providing a preload force to the sealing plate in the direction of the discharge port.

[0026] The beneficial effects of adopting the above-mentioned further solutions are:

[0027] The spring, normally compressed and providing preload, plays a crucial role in the sealing effect of the sealing plate. During normal operation, this preload ensures the sealing plate fits tightly against the corresponding position within the limiting tube, forming a reliable seal. This prevents material leakage from the gap between the sealing plate and the limiting tube during flow, ensuring the material flows along the predetermined channel and improving the stability of the injection molding process and product quality. When the nozzle is disassembled, the spring's preload quickly and forcefully pushes the sealing plate downwards, promptly sealing the outlet of the limiting tube and preventing further material leakage, waste, and contamination. Furthermore, the spring's preload can compensate for changes in the sealing gap caused by equipment wear or thermal expansion and contraction, maintaining excellent sealing performance, extending equipment lifespan, and reducing maintenance costs.

[0028] This invention provides a nozzle structure for cold runner systems. It has the following advantages:

[0029] When the nozzle is disassembled, the sealing plate moves downward under the combined action of spring return force and material pressure, precisely sealing the outlet of the limiting tube. This design effectively cuts off the channel for continued material flow, preventing material leakage from the outlet during nozzle replacement or equipment maintenance. This not only reduces material waste and lowers production costs but also prevents material leakage from causing pollution and damage to the equipment and the surrounding environment. The inlet is evenly distributed along the circumference of the limiting tube and is located above the initial sealing position of the sealing plate. This design allows material to enter the inner cavity of the limiting tube evenly from multiple directions, avoiding the problem of excessive local pressure or uneven material flow that may be caused by material concentrating in one direction. This ensures stable and smooth material flow within the channel, providing a stable and reliable material supply for the injection molding process and helping to improve the quality and consistency of injection molded products.

[0030] During nozzle installation, the internal support frame pushes the connecting rod, which in turn compresses the sealing plate spring and moves it upward above the inlet, automatically opening the material channel. When the nozzle is disassembled, the sealing plate automatically moves downward under the pressure of the spring and the material, sealing the outlet. The entire process eliminates the need for manual operation of complex valve devices, achieving automatic opening and closing of the material channel, greatly simplifying the operation process and improving production efficiency, especially suitable for large-scale, continuous injection molding operations. The spring is normally compressed, providing a preload force to the sealing plate towards the outlet. Under normal operating conditions, this preload force ensures the sealing plate fits tightly against the corresponding position within the limiting tube, enhancing the sealing effect and preventing material leakage from the gap between the sealing plate and the limiting tube during flow. Simultaneously, during nozzle disassembly, the spring preload force also helps the sealing plate seal the outlet more quickly and forcefully, further improving the reliability of the seal. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and are used to explain the present invention, but do not constitute an undue limitation of the present invention.

[0032] In the attached diagram:

[0033] Figure 1 This is a schematic diagram of the main appearance of this utility model;

[0034] Figure 2 This is a schematic diagram of the combined structure of this utility model;

[0035] Figure 3 This is a schematic diagram of the separated structure of this utility model.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1. Connecting cap; 101. Threaded connector; 102. Feed inlet; 103. Sealing plate; 104. Limiting tube; 105. Spring; 106. Connecting rod; 2. Nozzle; 201. Support frame. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Please see Figures 1 to 3 As shown, the embodiments provided by this utility model are as follows:

[0040] Example 1: A nozzle structure for cold runners, comprising:

[0041] The connecting cap 1 has a threaded connector 101 at its bottom end for mounting the nozzle 2;

[0042] A limiting tube 104 is provided inside the connecting cap 1. The side wall of the limiting tube 104 has a feed port 102, and a sealing plate 103 that can move axially is installed in its inner cavity by means of a spring 105.

[0043] And a nozzle 2 that can be detachably installed on the threaded connector 101, which has a support frame 201 inside;

[0044] When the nozzle 2 is installed in place, the support frame 201 pushes the connecting rod 106 to move axially, so that the sealing plate 103 compresses the spring 105 and moves upward above the feed inlet 102, opening the material channel;

[0045] When nozzle 2 is disassembled, sealing plate 103 moves downward under the restoring force of spring 105 and material pressure, blocking the outlet of limit tube 104.

[0046] Example 2: To further optimize the performance of the cold runner nozzle structure and improve its overall performance in injection molding production, for example, such as... Figures 1 to 3 As shown, this utility model also includes:

[0047] The connecting cap 1 has a threaded structure at its top for connection with the injection molding machine. This design makes the connection and disassembly of the connecting cap 1 to the injection molding machine extremely convenient. Using this common and mature threaded connection method, the connecting cap 1 can be quickly and securely installed onto the injection molding machine, greatly shortening the equipment assembly time and improving production preparation efficiency. At the same time, the threaded connection has good sealing performance, effectively preventing material leakage at the connection point, ensuring the stability of the injection molding process and product quality, and reducing cleaning work and material waste caused by material leakage. Moreover, when the equipment needs maintenance or parts replacement, the connecting cap 1 can be easily and quickly removed from the injection molding machine, reducing maintenance costs and time costs. The limiting tube 104 has a conical structure, and its inner cavity forms a material flow channel. The conical structure of the limiting tube 104 has several advantages. First, in terms of material flow, the conical structure can guide and accelerate the material flow. Material enters from the larger diameter end, and as the channel gradually narrows, the flow rate increases accordingly. This helps the material pass through the limiting tube 104 more smoothly and quickly, reducing the residence time of the material inside the tube and lowering the risk of degradation or deterioration due to prolonged heating, thereby improving the quality of the injection molded product. Secondly, the conical structure has a certain degree of tolerance during manufacturing and installation. Even with some dimensional deviations, it can ensure the smooth flow of material to a certain extent, improving the reliability and stability of the equipment. In addition, this structure can more evenly distribute pressure when subjected to material pressure, enhancing the overall strength of the limiting tube 104 and extending its service life. The sealing plate 103 forms a linkage mechanism with the support frame 201 through the connecting rod 106. The axial movement of the support frame 201 drives the connecting rod 106 to move the sealing plate 103. This linkage mechanism is ingeniously designed and practical. Through this linkage method, the movement of the sealing plate 103 is automatically synchronized with the installation and disassembly of the nozzle 2. When installing nozzle 2, the axial movement of support frame 201 can be precisely transmitted to sealing plate 103 through connecting rod 106, causing sealing plate 103 to move according to predetermined requirements and open the material channel without additional manual operation, thus improving the convenience and accuracy of operation. Similarly, when disassembling nozzle 2, the linkage mechanism can also ensure that sealing plate 103 seals the outlet in a timely and accurate manner to prevent material leakage. This automated linkage mechanism reduces the impact of human factors on equipment operation, lowers the probability of operational errors, and improves the working efficiency and reliability of the entire nozzle structure, making it particularly suitable for large-scale, continuous injection molding production environments. The feed inlet 102 is evenly distributed circumferentially along the limiting tube 104 and is located above the initial sealing position of sealing plate 103. The design of the feed inlet 102 being evenly distributed circumferentially along the limiting tube 104 has significant advantages. It allows material to enter the inner cavity of limiting tube 104 evenly from multiple directions, avoiding the problem of excessive local pressure or uneven material flow caused by material concentrating in one direction.Uniform material inflow helps ensure stable material flow within the channel, reducing eddies and turbulence, thereby minimizing energy loss and improving conveying efficiency. This design also allows for better material filling of the mold, increasing the density and uniformity of the injection-molded product and enhancing product quality. Positioning the inlet 102 above the initial sealing position of the sealing plate 103 ensures effective sealing of the channel below the inlet 102 when the sealing plate 103 is in its initial state, preventing material leakage during non-operation. Furthermore, when the channel needs to be opened, the sealing plate 103 can move upwards smoothly, allowing material to enter the limiting tube 104 through the inlet 102, ensuring the reliability and stability of the equipment operation. The spring 105, normally compressed, provides pre-tensioning force to the sealing plate 103 towards the outlet. This pre-tensioning force plays a crucial role in the sealing effect of the sealing plate 103. During normal operation, this preload ensures that the sealing plate 103 fits tightly against the corresponding position inside the limiting tube 104, forming a reliable seal. This prevents material leakage from the gap between the sealing plate 103 and the limiting tube 104 during flow, ensuring that the material flows along the predetermined channel and improving the stability of the injection molding process and product quality. When the nozzle 2 is disassembled, the preload of the spring 105 quickly and forcefully pushes the sealing plate 103 downward, promptly sealing the outlet of the limiting tube 104 and preventing further material leakage, waste, and contamination. Furthermore, the preload of the spring 105 can also compensate for changes in the sealing gap caused by equipment wear or thermal expansion and contraction, maintaining good sealing performance, extending the equipment's service life, and reducing maintenance costs.

[0048] Working principle: The nozzle 2 is detachably installed onto the threaded connector 101 at the bottom of the connecting cap 1. When the nozzle 2 is installed in place, the support frame 201 inside the nozzle 2 will push the connecting rod 106 to generate axial displacement. Since the sealing plate 103 forms a linkage mechanism with the support frame 201 through the connecting rod 106, the axial movement of the support frame 201 drives the connecting rod 106 to move the sealing plate 103, causing the sealing plate 103 to compress the spring 105 and move upward above the feed port 102. At this time, the material flow channel formed in the inner cavity of the limiting tube 104 is opened, and the material can enter the connecting cap 1 through the threaded structure at the top of the connecting cap 1 that is connected to the injection molding machine, and then flow into the inner cavity of the limiting tube 104 through the feed port 102, which is evenly distributed circumferentially along the side wall of the limiting tube 104 and located above the initial sealing position of the sealing plate 103, and then flow to the nozzle 2 through the opened channel.

[0049] During the injection molding process, the material continuously flows through the aforementioned open channel to complete the injection molding operation. At this time, the spring 105 is in a compressed state, providing a preload force to the sealing plate 103 in the direction of the discharge port, ensuring that the sealing plate 103 is stably positioned in the open material channel under normal working conditions.

[0050] When it is necessary to disassemble nozzle 2, remove nozzle 2 from threaded connector 101. At this time, sealing plate 103 loses the pushing action of support frame 201 and moves downward under the combined action of spring 105 restoring force and material pressure, finally blocking the outlet of limit tube 104, preventing material from continuing to flow out after nozzle 2 is disassembled, and avoiding material waste and possible pollution problems.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A nozzle structure for cold runners, characterized in that, include: The connecting cap (1) has a threaded connector (101) at its bottom end for mounting the nozzle (2); A limiting tube (104) is provided inside the connecting cap (1). The side wall of the limiting tube (104) is provided with a feed port (102), and an axially movable sealing plate (103) is installed in its inner cavity by a spring (105). And a nozzle (2) that can be detachably installed on a threaded connector (101), which has a support frame (201) inside; When the nozzle (2) is installed in place, the support frame (201) pushes the connecting rod (106) to move axially, so that the sealing plate (103) compresses the spring (105) and moves up to above the feed inlet (102) to open the material channel; When the nozzle (2) is disassembled, the sealing plate (103) moves downward under the restoring force of the spring (105) and the material pressure, blocking the outlet of the limiting tube (104).

2. The nozzle structure for cold runner according to claim 1, characterized in that: The top of the connecting cap (1) is provided with a threaded structure for connection with the injection molding machine.

3. The nozzle structure for cold runners according to claim 1, characterized in that: The limiting tube (104) has a conical structure, and its inner cavity forms a material flow channel.

4. The cold-runner nozzle structure of claim 1, wherein: The sealing plate (103) forms a linkage mechanism with the support frame (201) through the connecting rod (106). The axial movement of the support frame (201) drives the connecting rod (106) to move the sealing plate (103).

5. The cold-runner nozzle structure of claim 1, wherein: The feed inlet (102) is evenly distributed around the circumference of the limiting tube (104) and is located above the initial sealing position of the sealing plate (103).

6. The cold-runner nozzle structure of claim 1, wherein: The spring (105) is normally in a compressed state, providing a preload force to the sealing plate (103) in the direction of the discharge port.

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