Hot nozzle assembly and hot runner system

Abstract

The utility model provides a hot nozzle assembly and a hot runner system, the hot nozzle assembly comprises a hot nozzle, a nozzle core and a nozzle tip, and a first runner is formed in the hot nozzle; the nozzle core part is arranged in the hot nozzle and forms a second runner communicated with the first runner; the nozzle core is sleeved with the nozzle tip part, the nozzle tip forms a pouring gate communicated with the second runner, and in the direction from the first runner to the second runner, the inner diameter of the pouring gate is gradually increased, so that the pouring gate is in a horn shape. The pouring gate of the hot nozzle assembly is arranged to be trumpet-shaped, so that glue flows out in a bent manner and is not easy to bend.

Description

Technical Field

[0001] This application relates to the field of hot runner technology, and more particularly to a hot nozzle assembly and a hot runner system. Background Technology

[0002] In conventional hot runner systems, when injection molding products with long glass fibers, the long glass fibers are prone to breakage during the gate and molding processes, making it impossible to guarantee product quality. Summary of the Invention

[0003] The purpose of this application is to provide a hot nozzle assembly and a hot runner system. The gate at the tip of the hot nozzle assembly is formed in a trumpet shape. When the colloid flows out of the hot nozzle assembly through the gate, the space gradually increases and the colloid flows out in a curved manner. The long glass fibers in the colloid are less likely to break.

[0004] To achieve one of the above-mentioned objectives, one embodiment of this application provides a hot nozzle assembly, comprising:

[0005] The hot nozzle forms the first flow channel;

[0006] The nozzle core is partially disposed in the hot nozzle and forms a second flow channel communicating with the first flow channel;

[0007] The nozzle tip is partially fitted outside the nozzle core, and the nozzle tip forms a gate that communicates with the second flow channel. In the direction from the first flow channel to the second flow channel, the inner diameter of the gate gradually increases, making the gate flared.

[0008] In one embodiment of this application, the opening at the end of the second flow channel opposite to the first flow channel is a discharge port;

[0009] The hot nozzle assembly also includes a valve needle disposed in the first flow channel and the second flow channel. The valve needle moves axially in the first flow channel and the second flow channel to open or close the discharge port. The stroke of the valve needle is >8mm.

[0010] In one embodiment of this application, the valve needle has a stroke of 11 mm.

[0011] In one embodiment of this application, the end of the first flow channel away from the tip bends at an obtuse angle with the main body of the first flow channel, and the inner wall of the bend is smooth.

[0012] In one embodiment of this application, the hot nozzle further includes a first receiving cavity communicating with a first flow channel, the inner diameter of the first receiving cavity being greater than the inner diameter of the first flow channel, and one end of the nozzle core being disposed in the first receiving cavity and abutting against the end face of the first receiving cavity near the first flow channel.

[0013] In one embodiment of this application, a valve needle disposed within the first flow channel and the second flow channel is also included;

[0014] The nozzle core includes a fixed nozzle core and a guide member. The fixed nozzle core portion is disposed in the first receiving cavity. The guide member forms a guide portion and a discharge port. The guide portion is sleeved on the valve needle. The valve needle opens or closes the discharge port under the guidance of the guide portion.

[0015] In one embodiment of this application, the fixed nozzle core is provided with a fixed flow channel and a second receiving cavity that are interconnected. The guide member is disposed in the second receiving cavity and abuts against the end face of the second receiving cavity near the fixed flow channel. A connecting flow channel is formed between the inner wall of the guide member and the outer wall of the guide portion, which is connected to the fixed flow channel. The fixed flow channel and the connecting flow channel form the second flow channel.

[0016] In one embodiment of this application, the outer diameter of the portion of the fixed nozzle located in the first receiving cavity is greater than the outer diameter of the portion located outside the first receiving cavity, so as to form a step on the outer periphery of the fixed nozzle, and one end of the nozzle tip abuts against the step; the end of the nozzle tip abutting against the fixed nozzle tip is provided with a stepped portion, and the outer diameter of the stepped portion is greater than the outer diameter of the fixed nozzle.

[0017] The hot nozzle assembly also includes a pressure cap, which is connected to the outside of the hot nozzle and abuts against the stepped portion, so that the nozzle core and nozzle tip are connected to the hot nozzle.

[0018] This application also provides a hot runner system, including a manifold and a hot nozzle assembly connected to the manifold, wherein the hot nozzle assembly is the aforementioned hot nozzle assembly.

[0019] In one embodiment of this application, the manifold includes at least two intersecting flow channels, and a relief cavity is provided at the connection position of the at least two flow channels. The hot runner system also includes a manifold cap, which is disposed in the relief cavity and has a transition flow channel. The inner wall of the transition flow channel is smooth, and the two flow channels are connected through the transition flow channel.

[0020] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0021] In the hot runner assembly provided in this application, the nozzle tip is set in a funnel shape, and the colloid flows out in a curved manner when it flows out of the gate. Compared with the conventional gate and the inner wall of the mold cavity at a 90-degree angle, the colloid flows out more smoothly, and the long glass fibers in the colloid are less likely to break. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the hot nozzle assembly in an embodiment of this application.

[0023] Figure 2 yes Figure 1 A cross-sectional view along line AA (valve needle in the closed position).

[0024] Figure 3 yes Figure 2 Enlarged view of section B in the middle.

[0025] Figure 4 The gate and cavity fit in the prior art (a) and the gate and cavity fit in this application (b).

[0026] Figure 5 yes Figure 1 Cross-sectional view along line AA (valve needle in the open position).

[0027] Figure 6 This is a partial cross-sectional view of the hot runner system of this application.

[0028] 10. Hot nozzle assembly; 20. Manifold; 201. Relief cavity; 30. Manifold cap; 301. Transition channel;

[0029] 1. Hot nozzle; 11. First flow channel; 12. First receiving cavity; 2. Nozzle core; 21. Fixed nozzle core; 211. Fixed flow channel; 212. Second receiving cavity; 22. Guide component; 221. Guide section; 222. Discharge port; 223. Connecting flow channel; 23. Second flow channel; 3. Nozzle tip; 31. Gate; 32. Stepped section; 4. Valve needle; 5. Pressure cap. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0031] The terms used in this document, such as “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” indicating spatial relative positions, are used for illustrative purposes to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. The terms “spatial relative positions” may be intended to include different orientations of the equipment in use or operation other than those shown in the figures.

[0032] For example, if the device in the figure is flipped, a unit described as being "below" or "under" other units or features will be "above" other units or features. Therefore, the exemplary term "below" can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or otherwise) and the spatially related descriptive terms used herein will be interpreted accordingly.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Furthermore, it should be understood that although the terms "first," "second," etc., may be used herein to describe various elements or structures, the objects being described should not be limited by these terms. These terms are only used to distinguish these objects from one another. For example, a first flow channel may be referred to as a second flow channel, and similarly, a second flow channel may be referred to as a first flow channel, without departing from the scope of protection of this application.

[0035] This application provides a hot nozzle assembly 10, such as Figures 1-5 As shown, it includes a hot nozzle 1, a nozzle core 2, and a nozzle tip 3. The hot nozzle 1 forms a first flow channel 11. The nozzle core 2 is partially disposed in the hot nozzle 1 and forms a second flow channel 23 that communicates with the first flow channel 11. The nozzle tip 3 is partially sleeved outside the nozzle core 2 and forms a gate 31 that communicates with the second flow channel 23. In the direction from the first flow channel 11 to the second flow channel 23, the inner diameter of the gate 31 gradually increases, making the gate 31 flared.

[0036] In the hot runner system, the gate 31 of the nozzle tip 3 is aligned with the mold cavity, and the colloid in the hot nozzle assembly 10 is injected into the mold. Figure 4 In the prior art shown in (a), the nozzle tip 3 is at a 90° angle to the cavity, requiring a 90° turn when dispensing the adhesive, which can easily cause the long glass fiber to break during the turn. In this application, as... Figure 4 In (b), the nozzle tip 3 of the hot nozzle assembly 10 is set as a funnel shape for the gate 31 for discharging the adhesive. When the adhesive flows from the hot nozzle assembly 10 to the cavity of the mold, the funnel-shaped gate 31 makes the flow of the adhesive curved, and the long glass fibers in the adhesive are not easy to break.

[0037] In one embodiment of this application, the nozzle core 2 is located at the end of the second flow channel 23 opposite to the first flow channel 11, which is the discharge port 222; the hot nozzle assembly 10 also includes a valve needle 4 disposed in the first flow channel 11 and the second flow channel 23. The valve needle 4 moves axially in the first flow channel 11 and the second flow channel 23 to open or close the discharge port 222, and the stroke of the valve needle 4 is >8mm.

[0038] The outer circumference of the valve needle 4 near the outlet 222 is consistent with the inner circumference of the outlet 222, and is usually circular. When the valve needle 4 reciprocates within the first flow channel 11 and the second flow channel 23, it can open the outlet 222 to allow the colloid to flow out from the gate 31, or close the outlet 222 to stop the colloid from flowing out. Figure 2 The valve needle is in position 4 (open state when it moves from the closed state to the open outlet 222). Figure 5 (Position of valve needle 4). The distance valve needle 4 moves from the closed state to the open state is the stroke of valve needle 4. A stroke greater than 8mm allows for a larger gap between valve needle 4 and outlet 222 when the outlet is opened, enabling longer glass fibers in the colloid to pass through more easily and reducing the probability of breakage. It should be noted that the "position" in the movement of valve needle 4 from the closed state to the open outlet 222 refers to the position where valve needle 4 can no longer move away from outlet 222.

[0039] Preferably, the stroke of the valve needle 4 is 11 mm. When the long glass fiber has a stroke of 11 mm, the probability of breakage is greatly reduced when the valve needle 4 flows out of the discharge port 222 in the open state.

[0040] In one embodiment of this application, the end of the first flow channel 11 away from the nozzle tip 3 is bent at an obtuse angle to the main body of the first flow channel 11, and the inner wall of the bent portion is smooth. The obtuse angle between the end of the first flow channel 11 away from the nozzle tip 3 and the main body of the first flow channel 11 allows technicians to better observe the inner wall of the first flow channel 11 during processing, which is more conducive to smoothing the bending point of the first flow channel 11 during processing. The smooth inner wall is also more suitable for passing long glass fibers.

[0041] In one embodiment of this application, as Figure 3 In this device, the hot nozzle 1 also includes a first receiving cavity 12 communicating with the first flow channel 11. The inner diameter of the first receiving cavity 12 is greater than the inner diameter of the first flow channel 11. One end of the nozzle core 2 is disposed in the first receiving cavity 12 and abuts against the end face of the first receiving cavity 12 near the first flow channel 11. The nozzle core 2 is partially disposed in the first receiving cavity 12 and abuts against the step formed between the first receiving cavity 12 and the first flow channel 11, so that the first flow channel 11 and the second flow channel 23 are connected. The inner diameter of the end of the first flow channel 11 near the second flow channel 23 is equal to the inner diameter of the end of the second flow channel 23 near the first flow channel 11, so that the first flow channel 11 and the second flow channel 23 are tightly connected without forming a step and without forming glue accumulation.

[0042] Furthermore, the nozzle core 2 includes a fixed nozzle core 21 and a guide member 22. The fixed nozzle core 21 is partially disposed within the first receiving cavity 12. The guide member 22 forms a guide portion 221 and a discharge port 222. The guide portion 221 is sleeved on the valve needle 4, and the valve needle 4 opens or closes the discharge port 222 under the guidance of the guide portion 221. The fixed nozzle core 21 and the guide member 22 partially overlap radially. The guide member 22 is disposed within the fixed nozzle core 21 and extends out of the fixed nozzle core 21 to form the discharge port 222. The guide portion 221 sleeved on the valve needle 4 is disposed within the guide member 22 to prevent the slender valve needle 4 from deviating from its original trajectory during reciprocating motion and impacting the guide member 22, causing wear on both the valve needle 4 and the guide member 22.

[0043] Furthermore, the fixed nozzle core 21 is provided with a fixed flow channel 211 and a second receiving cavity 212 that are interconnected. The guide member 22 is disposed in the second receiving cavity 212 and abuts against the end face of the second receiving cavity 212 near the fixed flow channel 211. A connecting flow channel 223 is formed between the inner wall of the guide member 22 and the outer wall of the guide portion 221, which communicates with the fixed flow channel 211. The fixed flow channel 211 and the connecting flow channel 223 form the second flow channel 23. The guide portion 221 is connected to the interior of the guide member 22 by a connecting portion (not shown, but obscured by the guide portion 221). A valve needle 4 is disposed inside the guide portion 221, and a connecting flow channel 223 is formed between the exterior of the guide portion 221 and the inner wall of the guide member 22. The connection between the fixed nozzle core 21 and the guide member 22 is similar to the connection between the nozzle core 2 and the hot nozzle 1. Similarly, the inner diameter of the fixed flow channel 211 near the connecting flow channel 223 is the same as the inner diameter of the connecting flow channel 223 near the fixed flow channel 211.

[0044] In one embodiment of this application, the outer diameter of the portion of the fixed nozzle core 21 disposed in the first receiving cavity 12 is greater than the outer diameter of the portion located outside the first receiving cavity 12, so as to form a step on the outer periphery of the fixed nozzle core 21, and one end of the nozzle tip 3 abuts against the step; the end of the nozzle tip 3 abutting against the fixed nozzle core 21 is provided with a step portion 32, the outer diameter of the step portion 32 is greater than the outer diameter of the fixed nozzle core 21; the hot nozzle assembly 10 also includes a pressure cap 5, the pressure cap 5 is connected to the outside of the hot nozzle 1 and abuts against the step portion 32, so that the nozzle core 2 and the nozzle tip 3 are connected to the hot nozzle 1.

[0045] During the installation of the hot nozzle assembly 10, the nozzle core 2 is first inserted into the first receiving cavity 12 of the hot nozzle 1, or the guide 22 is first inserted into the second receiving cavity 212 of the fixed nozzle core 21. These two steps are not sequential. Then, the nozzle tip 3 is fitted onto the part of the nozzle core 2 that protrudes from the first receiving cavity 12. The stepped portion 32 simultaneously abuts against the fixed nozzle core 21 and the hot nozzle 1. Then, the pressure cap 5 is fitted onto the nozzle tip 3 and abuts against the stepped portion 32. The hot nozzle 1 is provided with external threads, and the pressure cap 5 is provided with internal threads. The pressure cap 5 and the hot nozzle 1 are connected by the internal and external threads. When the pressure cap 5 is tightened using the internal and external threads, the pressure cap 5 abuts against the stepped portion 32, applying pressure to the stepped portion 32. The nozzle tip 3 applies pressure to the fixed nozzle core 21, thereby pressing the fixed nozzle core 21 against the hot nozzle 1. At the same time, the nozzle tip 3 can also press the guide 22 against the fixed nozzle core 21.

[0046] This application also provides a hot runner system, including a manifold 20 and the aforementioned hot nozzle assembly 10 connected to the manifold 20.

[0047] In one embodiment of this application, the manifold 20 includes at least two intersecting flow channels, and a relief cavity 201 is provided at the connection position of the at least two flow channels. The hot runner system also includes a manifold cap 30, which is disposed in the relief cavity 201 and has a transition flow channel 301. The inner wall of the transition flow channel 301 is smooth, and the two flow channels are connected through the transition flow channel 301.

[0048] During the processing of the manifold 20, the flow channels within the manifold 20 are typically formed by drilling holes in the side wall of the manifold 20. The junction of two flow channels is usually far from the side wall of the manifold 20. The shape of the inner wall of the flow channel at the junction is related to the shape of the drill bit, making it difficult to ensure the smoothness of the inner wall. The rougher the inner wall of the flow channel, the more easily the long glass fibers in the colloid are obstructed and break. In this application, a relief cavity 201 is provided at the junction of the flow channels, and a manifold cap 30 is installed in the relief cavity 201. Since the manifold cap 30 is small in size, it is easier to process the transition flow channel 301 inside it, which can make the inner wall of the transition flow channel 301 inside the manifold cap 30 very smooth. Therefore, connecting the junction of the flow channels through the manifold cap 30 can reduce the risk of long glass fibers in the colloid breaking.

[0049] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. 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.

[0050] The detailed descriptions listed above are merely specific descriptions of feasible implementation methods of this application and are not intended to limit the scope of protection of this application. All equivalent implementation methods or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A hot nozzle assembly, characterized in that, include: The hot nozzle forms the first flow channel; The nozzle core is partially disposed in the hot nozzle and forms a second flow channel communicating with the first flow channel; The nozzle tip is partially fitted outside the nozzle core, and the nozzle tip forms a gate that communicates with the second flow channel. In the direction from the first flow channel to the second flow channel, the inner diameter of the gate gradually increases, making the gate flared.

2. The hot nozzle assembly according to claim 1, characterized in that, The nozzle core is located at the end of the second flow channel that is opposite to the first flow channel, and the opening is the discharge port. The hot nozzle assembly also includes a valve needle disposed in the first flow channel and the second flow channel. The valve needle moves axially in the first flow channel and the second flow channel to open or close the discharge port. The stroke of the valve needle is >8mm.

3. The hot nozzle assembly according to claim 2, characterized in that, The valve needle has a stroke of 11 mm.

4. The hot nozzle assembly according to claim 1, characterized in that, The end of the first flow channel away from the nozzle tip is bent at an obtuse angle to the main body of the first flow channel, and the inner wall of the bent part is smooth.

5. The hot nozzle assembly according to claim 1, characterized in that, The hot nozzle also includes a first receiving cavity communicating with the first flow channel, the inner diameter of the first receiving cavity being greater than the inner diameter of the first flow channel, and one end of the nozzle core being disposed in the first receiving cavity and abutting against the end face of the first receiving cavity near the first flow channel.

6. The hot nozzle assembly according to claim 5, characterized in that, It also includes valve needles disposed in the first and second flow channels; The nozzle core includes a fixed nozzle core and a guide member. The fixed nozzle core portion is disposed in the first receiving cavity. The guide member forms a guide portion and a discharge port. The guide portion is sleeved on the valve needle. The valve needle opens or closes the discharge port under the guidance of the guide portion.

7. The hot nozzle assembly according to claim 6, characterized in that, The fixed nozzle core is provided with a fixed flow channel and a second receiving cavity that are interconnected. The guide is disposed in the second receiving cavity and abuts against the end face of the second receiving cavity near the fixed flow channel. A connecting flow channel is formed between the inner wall of the guide and the outer wall of the guide portion, which is connected to the fixed flow channel. The fixed flow channel and the connecting flow channel form the second flow channel.

8. The hot nozzle assembly according to claim 6, characterized in that, The outer diameter of the portion of the fixed nozzle core located in the first receiving cavity is greater than the outer diameter of the portion located outside the first receiving cavity, so as to form a step on the outer periphery of the fixed nozzle core, and one end of the nozzle tip abuts against the step; the end of the nozzle tip abutting against the fixed nozzle core is provided with a stepped portion, and the outer diameter of the stepped portion is greater than the outer diameter of the fixed nozzle core. The hot nozzle assembly also includes a pressure cap, which is connected to the outside of the hot nozzle and abuts against the stepped portion, so that the nozzle core and nozzle tip are connected to the hot nozzle.

9. A hot runner system, characterized in that, It includes a manifold and a hot nozzle assembly connected to the manifold, wherein the hot nozzle assembly is the hot nozzle assembly according to any one of claims 1 to 8.

10. The hot runner system according to claim 9, characterized in that, The manifold includes at least two intersecting flow channels, and a clearance cavity is provided at the connection position of the at least two flow channels. The hot runner system also includes a manifold cap, which is disposed in the clearance cavity and has a transition flow channel. The inner wall of the transition flow channel is smooth, and the two flow channels are connected through the transition flow channel.

Images