Elliptical sealing surface and bottom positioning structure of hot runner valve needle

Abstract

The utility model discloses a hot runner valve needle elliptical sealing surface and bottom positioning structure, which comprises a needle body, the cross section of the needle body is of a circular structure, the needle body comprises a fixed section, a sliding section and an opening and closing section, one end of the bottom of the opening and closing section is integrally connected with a sealing surface block, the whole sealing surface block is of an elliptical cylindrical structure, and the opening and closing section is of a circular structure. And the size of the glue sealing surface block is smaller than that of the opening and closing section. According to the utility model, by improving the structure of the glue sealing surface block, the uniformity and the sealing property of glue sealing can be ensured, and the product quality and the production efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an elliptical sealing surface and bottom positioning structure for a hot runner valve needle. Background Technology

[0002] In injection molding, hot runner systems are widely used to control the flow of molten plastic. The valve needle is a key component of the hot runner system, used to control the injection and sealing of the plastic. Traditional valve needles typically have a circular sealing surface.

[0003] The existing hot runner valve needle's elliptical sealing surface and bottom positioning structure have the following defects:

[0004] Existing valve needles are prone to uneven sealing, resulting in leakage or stress concentration. Furthermore, valve needles are susceptible to displacement or vibration under high temperature and high pressure environments, which can affect the precision of injection molding.

[0005] Therefore, a solution is needed. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this utility model provides an elliptical sealing surface and bottom positioning structure for a hot runner valve needle, thereby solving the problems mentioned in the background section.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model is implemented through the following technical solution: an elliptical sealing surface for a hot runner valve needle, comprising a needle body, the needle body having a circular cross-section, the needle body comprising a fixed section, a sliding section and an opening / closing section, a sealing surface block integrally connected to the bottom end of the opening / closing section, the sealing surface block having an overall elliptical cylindrical structure, and the size of the sealing surface block being smaller than that of the opening / closing section.

[0010] Preferably, the needle body is made of either hard alloy or special steel. A protrusion is connected to the top end of the fixing section via a connecting column. The connection between the connecting column and the protrusion has a rounded transition angle. The size of the connecting column is smaller than that of the protrusion and the fixing section. The protrusion has an overall circular structure.

[0011] Preferably, the needle body has a hard chrome layer, and the outer edge of the hard chrome layer also has a heat-resistant and non-stick layer. The connection between the sealing surface and the opening / closing section is inclined. The long axis of the sealing surface matches the geometry of the mold flow channel. The sliding section is located inside the hot runner plate, and the opening / closing section is located inside the nozzle.

[0012] A hot runner valve needle bottom positioning structure, employing a valve needle structure with an elliptical sealing surface as described in any of the above embodiments: including positioning structure one and positioning structure two, wherein both positioning structure one and positioning structure two employ one of a plurality of positioning bosses and positioning grooves.

[0013] Preferably, the first positioning structure is located at a portion of the end where the opening / closing section connects to the sealing surface, and the second positioning structure is located at a portion of the top outer edge of the sliding section.

[0014] Preferably, the first positioning structure and the second positioning structure are aligned with the inlet of the mold flow channel.

[0015] (III) Beneficial Effects

[0016] This utility model provides an elliptical sealing surface and bottom positioning structure for a hot runner valve needle. It has the following beneficial effects:

[0017] This type of hot runner valve needle features an elliptical sealing surface and bottom positioning structure. By improving the structure of the sealing surface block and adopting an elliptical structure, the uniformity and sealing performance of the sealing are enhanced. At the same time, the positioning structure one and positioning structure two ensure the stability of the valve needle during the injection molding process, enabling the valve needle to effectively improve product quality and production efficiency in the field of precision injection molding. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the sealing surface block described in this utility model;

[0020] Figure 3 This is a schematic diagram of the protrusion described in this utility model;

[0021] Figure 4 This is a schematic diagram of the second positioning structure described in this utility model.

[0022] In the diagram: Sliding section-1, Sealing surface block-2, Connecting column-3, Positioning structure one-4, Positioning structure two-5, Protrusion-6, Fixing section-7, Opening and closing section-8, Needle body-9. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-4 This utility model provides a technical solution:

[0025] Example 1

[0026] Regarding the problem 1 that needs to be solved above: the existing valve needle is prone to uneven sealing, resulting in glue leakage or stress concentration.

[0027] The solution is as follows: A hot runner valve needle elliptical sealing surface includes a needle body 9, the cross-section of the needle body 9 is circular, the needle body 9 includes a fixed section 7, a sliding section 1 and an opening and closing section 8. Specifically, as shown in convex 1, the dimensions of the fixed section 1, the sliding section 1 and the opening and closing section 8 decrease sequentially. A sealing surface block 2 is integrally connected to one bottom end of the opening and closing section 8. The sealing surface block 2 is elliptical cylindrical in shape, and the size of the sealing surface block 2 is smaller than that of the opening and closing section 8.

[0028] Furthermore, the needle body 9 is made of either hard alloy or special steel. The needle body 9 has a hard chrome layer, and the outer edge of the hard chrome layer also has a heat-resistant and non-stick layer. Specifically, the surface of the valve needle is plated or coated to improve wear resistance and corrosion resistance. At the same time, the structural design of the valve needle takes into account the temperature changes of the hot runner system to ensure that it can maintain a stable sealing effect in high-temperature environments. The top end of the fixed section 7 is connected to a protrusion 6 through a connecting post 3. The connection between the connecting post 3 and the protrusion 6 has a rounded transition angle. The size of the connecting post 3 is smaller than that of the protrusion 6 and the fixed section 7. The protrusion 6 is a circular structure. Specifically, the protrusion 6, the connecting post 3 and the needle body 9 are set in concentric circles.

[0029] Furthermore, the connection between the sealing surface 2 and the opening / closing section 8 is inclined. The long axis of the sealing surface 2 matches the geometry of the mold runner. Specifically, this structure can improve the uniformity and sealing performance of the sealing. The elliptical gate design is suitable for products that are long and narrow or have large local variations. The advantage of slow glue flow on the long side and fast glue flow on the short side of the elliptical gate can effectively solve product defects. The sliding section 1 is located inside the hot runner plate, and the opening / closing section 8 is located inside the nozzle.

[0030] Example 2

[0031] Regarding the second problem to be solved above: the existing valve needle is prone to displacement or vibration under high temperature and high pressure environment, which affects the injection molding accuracy.

[0032] The solution is as follows: A hot runner valve needle bottom positioning structure, which adopts a valve needle structure with an elliptical sealing surface as described in any of the above embodiments, including positioning structure one 4 and positioning structure two 5. Positioning structure one 4 and positioning structure two 5 both adopt one of a plurality of positioning bosses and positioning grooves. Positioning structure one 4 is located at a part of the end where the opening and closing section 8 is connected to the sealing surface block 2. Positioning structure two 5 is located at a part of the top of the outer side of the sliding section 1. Positioning structure one 4 and positioning structure two 5 fit into the mold flow channel inlet.

[0033] Working principle: During operation, when the needle body 9 moves downward in the hot runner, it blocks the nozzle opening through the opening and closing section 8, preventing the molten plastic from flowing. When the needle body 9 moves upward in the runner, the opening and closing section 8 leaves the nozzle opening, allowing the high-pressure molten plastic to flow outward for injection. During injection, the molten plastic passes through the sealing surface 2, which has an elliptical structure, improving the uniformity and sealing of the seal. At the same time, the positioning structure 4 and positioning structure 5 ensure the stability of the movement when the valve needle is moved by the cylinder, thus effectively improving product quality and production efficiency in the field of precision injection molding.

[0034] The components of this utility model, including the sliding section-1, sealing surface block-2, connecting column-3, positioning structure one-4, positioning structure two-5, protrusion-6, fixing section-7, opening and closing section-8, and needle body-9, are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods. The problems solved by this utility model are that valve needles are prone to uneven sealing, resulting in leakage or stress concentration, and that valve needles are prone to displacement or vibration under high temperature and high pressure environments, thus affecting the precision of injection molding. Through the combination of the above components, this utility model enables valve needles to effectively improve product quality and production efficiency in the field of precision injection molding. By improving the structure of the sealing surface block and adopting an elliptical structure, the uniformity and sealing performance of sealing are improved. At the same time, the positioning structure one and positioning structure two can ensure the stability of the valve needle during the injection molding process.

[0035] 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.

[0036] 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. An elliptical sealing surface for a hot runner valve needle, characterized in that: It includes a needle body (9), the cross-section of which is circular. The needle body (9) includes a fixed section (7), a sliding section (1) and an opening and closing section (8). A sealing block (2) is integrally connected to one bottom end of the opening and closing section (8). The sealing block (2) is an elliptical cylindrical structure. The size of the sealing block (2) is smaller than that of the opening and closing section (8).

2. The elliptical sealing surface of a hot runner valve needle according to claim 1, characterized in that: The needle body (9) is made of hard alloy. A protrusion (6) is connected to the top end of the fixed section (7) by a connecting column (3). The connection between the connecting column (3) and the protrusion (6) has an arc transition angle. The size of the connecting column (3) is smaller than that of the protrusion (6) and the fixed section (7). The protrusion (6) is a circular structure.

3. The elliptical sealing surface of a hot runner valve needle according to claim 1, characterized in that: The needle body (9) has a hard chrome layer, and the outer edge of the hard chrome layer also has a heat-resistant and non-stick layer. The connection between the sealing block (2) and the opening and closing section (8) is inclined. The long axis of the sealing block (2) matches the geometry of the mold flow channel. The sliding section (1) is located inside the hot runner plate, and the opening and closing section (8) is located inside the nozzle.

4. A bottom positioning structure for a hot runner valve needle, characterized in that, The valve needle structure with an elliptical sealing surface of the hot runner valve needle as described in any of claims 1-3 includes a positioning structure one (4) and a positioning structure two (5), wherein the positioning structure one (4) and the positioning structure two (5) each adopt one of a plurality of positioning bosses and positioning grooves.

5. The hot runner valve needle bottom positioning structure according to claim 4, characterized in that: The first positioning structure (4) is located at a part of the end where the opening and closing section (8) is connected to the sealing surface block (2), and the second positioning structure (5) is located at a part of the top of the outer side of the sliding section (1).

6. The hot runner valve needle bottom positioning structure according to claim 4, characterized in that: The positioning structure one (4) and the positioning structure two (5) are aligned with the mold flow channel inlet.

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