Valve needle positioning and guiding device, hot runner system and injection mold

Abstract

The utility model belongs to the technical field of injection molding, and discloses a valve needle positioning and guiding device, a hot runner system and an injection mold, the valve needle positioning and guiding device comprises a hot nozzle, an injection nozzle and a guiding piece, the injection nozzle and the hot nozzle are sequentially and coaxially nested and matched from inside to outside, a glue outlet is formed in the lower end of the hot nozzle, and a valve needle sequentially penetrates through the hot nozzle and the injection nozzle. And the guide part is arranged in the nozzle and can be in sliding sealing fit with the glue outlet, the guide part is coaxially embedded in the nozzle, a first guide hole in sliding fit with the valve needle is formed in the center of the guide part, a runner for molten plastic to pass through is formed between the guide part and the nozzle, and the valve needle is guided on the premise that injection molding is not affected. The guide part is coaxially nested in the nozzle and can guide the valve needle at the close distance of the glue outlet, so that the valve needle and the glue outlet are always concentric and coaxial, and bending, breakage or poor glue sealing of the valve needle caused by movement or deviation of the valve needle are avoided, so that the service life of the valve needle is prolonged, the maintenance frequency is reduced, and the production efficiency is improved; and the glue opening position of the product is attractive, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to a valve needle positioning and guiding device, a hot runner system and an injection mold. Background Technology

[0002] During injection molding, the hot runner system fills with molten plastic, which then flows through the injection nozzle, manifold, hot nozzle, and outlet into the mold cavity. The needle valve hot runner system uses a valve needle to control the opening and closing of the outlet. One end of the valve needle is connected to the drive mechanism, and the circumference of the valve needle is surrounded by molten plastic.

[0003] like Figure 1 As shown, in the prior art, the end of the diverter plate 300 near the drive mechanism 200 is provided with a sealing guide sleeve 400 that is slidably sealed with the valve needle 100. When the outlet 11 is closed, the other end of the valve needle 100 is sealed with the outlet 11, which can guide both ends of the valve needle 100. However, when the outlet 11 is open, the end of the valve needle 100 near the outlet 11 loses its guidance. Since the molten plastic is viscous, it is easy to affect the positioning and guidance of the valve needle 100, causing the valve needle 100 to be unable to return to its original position, affecting the sealing effect of the valve needle 100 on the outlet 11, and thus affecting the injection molding of the product, resulting in material accumulation on the product surface. Moreover, when the drive mechanism 200 drives the valve needle 100 to forcibly reset, it is easy to cause the valve needle 100 to bend and break, making maintenance difficult.

[0004] Therefore, there is an urgent need to propose a valve needle positioning and guiding device, a hot runner system, and an injection mold to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a valve needle positioning and guiding device, a hot runner system, and an injection mold, which can improve the problems of valve needle bending, breakage, and poor sealing, reduce maintenance frequency, improve production efficiency, and make the product's gate area more aesthetically pleasing, thereby improving product quality.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A valve needle positioning and guiding device includes a hot nozzle, a nozzle, and a guide member. The nozzle and the hot nozzle are coaxially nested together from the inside to the outside. The lower end of the hot nozzle has a dispensing port. The valve needle passes through the hot nozzle and the nozzle in sequence and can be slidably sealed with the dispensing port. The guide member is coaxially embedded in the nozzle. The center of the guide member has a first guide hole that slides with the valve needle. A flow channel for molten plastic to pass through is formed between the guide member and the nozzle.

[0008] Furthermore, the guide includes a body embedded within the nozzle, the body conforming to the interior of the nozzle.

[0009] Furthermore, the valve needle positioning and guiding device also includes a positioning ring, which is disposed along the axial direction of the hot nozzle between the nozzle and the hot nozzle, and the positioning ring is configured to press the guide member against the nozzle.

[0010] Furthermore, the guide also includes an abutting portion protruding from the upper end face of the nozzle, the abutting portion forming an obtuse angle with the upper end face of the nozzle, and the positioning ring having an abutting surface that can fit against the abutting portion.

[0011] Furthermore, the height of the abutment portion is 1 mm to 4 mm.

[0012] Furthermore, the guide member is circumferentially machined with a flow channel, which is spiral in shape.

[0013] Furthermore, the guide member has at least three flow channels evenly distributed circumferentially.

[0014] Furthermore, the sidewall of the guide member smoothly transitions to the lower end face of the guide member.

[0015] A hot runner system includes a valve needle, a drive mechanism, and a manifold. The valve needle is disposed at the output end of the drive mechanism. The manifold has a sealing guide sleeve at one end near the drive mechanism. The sealing guide sleeve has a second guide hole that slidably seals with the valve needle. The hot runner system further includes a valve needle positioning and guiding device as described in any one of the claims. The drive mechanism is used to drive the valve needle to move axially under the guidance of the sealing guide sleeve and the guide member to open or close the outlet.

[0016] An injection molding apparatus includes a mold and a hot runner system as described in claim 1, wherein the mold has a cavity and the outlet is connected to the cavity.

[0017] The beneficial effects of this utility model are:

[0018] This invention provides a valve needle positioning and guiding device, a hot runner system, and an injection mold. The device includes a hot nozzle, an injection nozzle, and a guide component. The injection nozzle and the hot nozzle are coaxially nested from the inside out. The lower end of the hot nozzle has a discharge port. The valve needle passes through the hot nozzle and the injection nozzle sequentially and can slidably seal with the discharge port. The guide component is coaxially embedded in the injection nozzle, and its center has a first guide hole that slides with the valve needle. A flow channel for molten plastic is formed between the guide component and the injection nozzle, guiding the valve needle without affecting injection molding. By setting a coaxially nested guide component in the injection nozzle, the valve needle can be guided at a close distance to the discharge port, ensuring that the valve needle and the discharge port are always concentric and coaxial. This facilitates a sealing fit between the valve needle and the discharge port when the valve needle returns to its original position, preventing misalignment due to movement or misalignment, which could lead to valve needle bending, breakage, or poor sealing. This extends the valve needle's service life, reduces maintenance frequency, and improves production efficiency. Furthermore, it makes the product's discharge port more aesthetically pleasing and improves product quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a hot runner system in the prior art;

[0020] Figure 2 This is a schematic diagram of the hot runner system of this utility model;

[0021] Figure 3 This is an exploded view of the valve needle positioning and guiding device of this utility model;

[0022] Figure 4 This is a cross-sectional view of the valve needle positioning and guiding device of this utility model.

[0023] In the picture:

[0024] 100. Valve needle; 200. Drive mechanism; 300. Diverter plate; 400. Sealing guide sleeve;

[0025] 1. Hot nozzle; 11. Dispensing port; 2. Injector; 3. Guide component; 31. First guide hole; 32. Body; 33. Abutting part; 34. Flow guide groove; 4. Positioning ring; 41. Abutting surface. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] like Figures 2-4As shown, this embodiment provides a valve needle positioning and guiding device, including a hot nozzle 1, a nozzle 2, and a guide member 3. The nozzle 2 and the hot nozzle 1 are coaxially nested from the inside to the outside. The lower end of the hot nozzle 1 has a glue outlet 11. The valve needle 100 is sequentially inserted into the hot nozzle 1 and the nozzle 2 and can be slidably sealed with the glue outlet 11. The guide member 3 is coaxially embedded in the nozzle 2. The center of the guide member 3 has a first guide hole 31 that slides with the valve needle 100. A flow channel for molten plastic to pass through is formed between the guide member 3 and the nozzle 2, guiding the valve needle 100 without affecting the injection molding. By setting a coaxially nested guide 3 inside the nozzle 2, the valve needle 100 can be positioned and guided at a close distance to the dispensing port 11, ensuring that the valve needle 100 and the dispensing port 11 are always concentric and coaxial. This facilitates a sealing fit between the valve needle 100 and the dispensing port 11 when the valve needle 100 returns to its original position. It also prevents the valve needle 100 from becoming misaligned with the dispensing port 11 due to movement or misalignment, which could lead to bending, breakage, or poor sealing of the valve needle 100. This extends the service life of the valve needle 100, reduces maintenance frequency, and improves production efficiency. Furthermore, it makes the dispensing port of the product more aesthetically pleasing and improves product quality.

[0031] It is easy to understand that the hot nozzle 1 has a split structure so that the nozzle 2 can be nested inside the hot nozzle 1, which facilitates the assembly of the hot runner system. Its specific structure is existing technology and will not be described in detail here.

[0032] Furthermore, the first guide hole 31 and the valve needle 100 are slidably sealed together to prevent material accumulation in the first guide hole 31 and avoid affecting product quality.

[0033] like Figure 3 and Figure 4 As shown, the guide 3 includes a body 32 embedded in the nozzle 2. The body 32 conforms to the interior of the nozzle 2, and the surface of the body 32 can fit against the nozzle 2. This can prevent the guide 3 from moving inside the nozzle 2, which is beneficial to improving the stability of the installation between the guide 3 and the nozzle 2, and can also prevent material accumulation between the guide 3 and the nozzle 2.

[0034] In this embodiment, the valve needle positioning and guiding device further includes a positioning ring 4. The positioning ring 4 is disposed between the nozzle 2 and the hot nozzle 1 along the axial direction of the hot nozzle 1. The positioning ring 4 is configured to press the guide member 3 against the nozzle 2 to prevent the guide member 3 from moving, thereby improving the stability of the sliding connection between the guide member 3 and the valve needle 100 and avoiding affecting the guidance of the valve needle 100.

[0035] To facilitate installation, the guide member 3 also includes an abutment portion 33 protruding from the upper end face of the nozzle 2. The abutment portion 33 forms an obtuse angle with the upper end face of the nozzle 2, and the positioning ring 4 has an abutment surface 41 that fits against the abutment portion 33. It is easy to understand that the abutment portion 33 forms an obtuse angle with the upper end face of the nozzle 2, meaning the diameter of the abutment portion 33 is smaller than the inner diameter of the nozzle 2. This prevents the abutment portion 33 from obstructing the upper end face of the nozzle 2, facilitating the installation of the positioning ring 4 onto the nozzle 2, so that the abutment surface 41 abuts against the abutment portion 33. This design simplifies the structure of the positioning ring 4 and the guide member 3, and improves the ease of assembling the valve needle positioning guide device.

[0036] Specifically, the height of the abutment portion 33 is 1 mm to 4 mm, which makes the contact area between the positioning ring 4 and the abutment portion 33 reasonable, thereby improving the positioning stability of the positioning ring 4 on the guide member 3 and facilitating assembly. For example, the height of the abutment portion 33 can be 1 mm, 2 mm, 3.5 mm or 4 mm, etc., and is not limited here.

[0037] When molten plastic flows linearly towards the outlet 11 in the hot runner, the flow rate is high and the fluid pressure is large. When the valve needle 100 blocks the outlet 11, a small amount of molten plastic easily overflows, causing material buildup at the product's nozzle. To solve this problem, the guide member 3 in this embodiment is circumferentially machined with a guide groove 34, which is spiral-shaped, forming a spiral flow channel between the guide member 3 and the nozzle 2. After flowing through the spiral flow channel, the molten plastic has a downward rotating tendency, which can reduce the fluid pressure of the molten plastic. When the valve needle 100 blocks the outlet 11, the spirally flowing molten plastic will backflow, and the valve needle 100 can quickly and cleanly cut off the molten plastic, avoiding material buildup at the product's nozzle, thus making the product more aesthetically pleasing and further improving product quality.

[0038] Furthermore, the guide member 3 has at least three flow channels 34 evenly distributed around its circumference, which can divert the molten plastic, thereby further reducing the fluid pressure. The evenly distributed flow channels 34 can balance the fluid pressure, which is beneficial to further improving product quality.

[0039] like Figure 3 As shown, the sidewall of the guide 3 and the lower end face of the guide 3 are smoothly transitioned, which can prevent stress concentration, extend the service life of the guide 3, and facilitate the flow of molten plastic and avoid material accumulation.

[0040] like Figure 2As shown, this embodiment also provides a hot runner system, including a valve needle 100, a drive mechanism 200, and a manifold 300. The valve needle 100 is disposed at the output end of the drive mechanism 200. A sealing guide sleeve 400 is provided at one end of the manifold 300 near the drive mechanism 200. The sealing guide sleeve 400 has a second guide hole that can slidably seal with the valve needle 100. The hot runner system also includes a valve needle positioning and guiding device as described in any of the above embodiments. The drive mechanism 200 is used to drive the valve needle 100 to move axially under the guidance of the sealing guide sleeve 400 and the guide member 3 to open or close the outlet 11. The sealing guide sleeve 400 is disposed near the drive mechanism 200, and the guide member 3 is disposed near the outlet 11. This arrangement effectively guides both ends of the valve needle 100. The sealing guide sleeve 400 and the guide member 3 work together to guide the valve needle 100, ensuring that it always moves along a designated path during the opening or closing of the dispensing port 11. The valve needle 100 remains concentric and coaxial with the dispensing port 11, facilitating a sealing fit when it returns to its original position. This prevents the valve needle 100 from becoming misaligned with the dispensing port 11 due to movement or misalignment, which could lead to bending, breakage, or poor sealing. This extends the service life of the valve needle 100, reduces the maintenance frequency of the hot runner system, and improves production efficiency. Furthermore, it enhances the appearance of the dispensing port, improving product quality.

[0041] Furthermore, this embodiment also provides an injection molding device, including a mold and the above-mentioned hot runner system. The mold has a cavity, and the outlet 11 is connected to the cavity. By applying the above-mentioned hot runner system, the outlet position of the product can be made aesthetically pleasing, thereby improving product quality and production efficiency.

[0042] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A valve needle positioning and guiding device, characterized in that, The device includes a hot nozzle (1), a nozzle (2), and a guide (3). The nozzle (2) and the hot nozzle (1) are coaxially nested together from the inside out. The lower end of the hot nozzle (1) has a glue outlet (11). A valve needle (100) is inserted into the hot nozzle (1) and the nozzle (2) in sequence and can be slidably sealed with the glue outlet (11). The guide (3) is coaxially embedded in the nozzle (2). The center of the guide (3) has a first guide hole (31) that slides with the valve needle (100). A flow channel for molten plastic to pass through is formed between the guide (3) and the nozzle (2).

2. The valve needle positioning and guiding device according to claim 1, characterized in that, The guide (3) includes a body (32) embedded in the nozzle (2), and the body (32) conforms to the interior of the nozzle (2).

3. The valve needle positioning and guiding device according to claim 1, characterized in that, The valve needle positioning and guiding device further includes a positioning ring (4), which is disposed between the nozzle (2) and the hot nozzle (1) along the axial direction of the hot nozzle (1). The positioning ring (4) is configured to press the guide (3) against the nozzle (2).

4. The valve needle positioning and guiding device according to claim 3, characterized in that, The guide member (3) also includes an abutting part (33) protruding from the upper end face of the nozzle (2), the abutting part (33) forming an obtuse angle with the upper end face of the nozzle (2), and the positioning ring (4) having an abutting surface (41) that can fit with the abutting part (33).

5. The valve needle positioning and guiding device according to claim 4, characterized in that, The height of the contact portion (33) is 1 mm to 4 mm.

6. The valve needle positioning and guiding device according to any one of claims 1 to 5, characterized in that, The guide member (3) has a circumferentially machined guide groove (34), which is spiral in shape.

7. The valve needle positioning and guiding device according to claim 6, characterized in that, The guide member (3) has at least three flow channels (34) evenly distributed in the circumference.

8. The valve needle positioning and guiding device according to any one of claims 1 to 5, characterized in that, The sidewall of the guide (3) smoothly transitions to the lower end face of the guide (3).

9. A hot runner system, comprising a valve needle (100), a drive mechanism (200), and a manifold (300), wherein the valve needle (100) is disposed at the output end of the drive mechanism (200), and a sealing guide sleeve (400) is provided at one end of the manifold (300) near the drive mechanism (200), the sealing guide sleeve (400) having a second guide hole that slidably and sealingly engages with the valve needle (100), characterized in that, The hot runner system further includes a valve needle positioning and guiding device as described in any one of claims 1 to 8, wherein the driving mechanism (200) is used to drive the valve needle (100) to move axially under the guidance of the sealing guide sleeve (400) and the guide member (3) to open or close the dispensing port (11).

10. An injection molding apparatus, characterized in that, Includes a mold and a hot runner system as described in claim 9, wherein the mold has a cavity and the outlet (11) is connected to the cavity.

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