A self-cleaning device, valve needle assembly and hot runner system

Abstract

The utility model provides a kind of self-cleaning device, valve needle assembly and hot runner system, it is related to hot runner system technical field, solve the existing nozzle runner hole inner wall surface easy to stagnate in prior art glue material, there is the technical problem of influencing product quality.The self-cleaning device, valve needle assembly and hot runner system include cleaning structure and two positioning structures;Two positioning structures are coaxial and are spaced apart, cleaning structure is arranged between adjacent two positioning structures, and it extends in the axial direction of positioning structure in spiral shape, to form flow path in the center of cleaning structure.The utility model is used to provide a kind of self-cleaning device, valve needle assembly and hot runner system capable of cleaning the nozzle runner hole inner wall, improve product quality.

Description

Technical Field

[0001] This utility model relates to the field of hot runner system technology, and in particular to a self-cleaning device, valve needle assembly and hot runner system. Background Technology

[0002] Hot runner systems are widely used in the plastic injection molding industry, especially in the production of complex, high-precision, high-volume plastic products. It is a technical system used to control the temperature and flow path of molten plastic from the injection molding machine nozzle to the mold cavity. Hot runner systems can significantly improve product quality, reduce scrap rates, and increase production efficiency.

[0003] Hot runner systems are mainly divided into open hot runner systems and needle valve hot runner systems, such as... Figure 8 As shown, the existing needle valve flow channel system consists of a cylinder, a valve needle, a main nozzle, a manifold, and a nozzle. The molten plastic in the main nozzle flows through the manifold to the flow channel holes inside the nozzle, and finally flows into the injection cavity through the gate. The valve needle is coaxially arranged with the nozzle, and the cylinder is used to drive the valve needle to move. The gate can be closed or opened by the valve needle, thereby completing the injection molding process.

[0004] However, as Figure 9 As shown, during the flow of molten plastic within the nozzle orifice, the fluid velocity reaches its maximum at the center of the orifice and its minimum at the orifice wall, typically exhibiting a parabolic velocity distribution. Correspondingly, the molten plastic within the nozzle orifice is roughly divided into a high-speed layer H, a medium-speed layer I, and a low-speed layer J. The inner wall of the nozzle orifice is not perfectly smooth and possesses a certain degree of roughness. During production, the molten plastic continuously passes through the inner wall of the nozzle orifice, resulting in the lowest-velocity molten plastic adhering to its inner wall surface. This causes the molten plastic to stagnate on the inner surface of the nozzle orifice, forming a dead substance.

[0005] The heating wire wrapped around the outside of the nozzle causes the plastic melt adhering to the inner wall of the flow channel to be continuously heated to a certain degree. When the plastic melt with a high flow rate away from the center of the flow channel carries away a portion of the medium-speed layer of plastic melt, it will cause black and yellow streaks in the plastic parts, affecting product quality. Utility Model Content

[0006] The purpose of this invention is to provide a self-cleaning device, a valve needle assembly, and a hot runner system to solve the technical problem in the prior art where the inner wall of the nozzle flow channel easily stagnates with adhesive, affecting product quality. The various technical effects of the preferred solutions among the many technical solutions provided by this invention are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] The self-cleaning device provided by this utility model includes a cleaning structure and two positioning structures;

[0009] in:

[0010] The two positioning structures are coaxial and spaced apart. The cleaning structure is disposed between the two adjacent positioning structures and extends spirally along the axial direction of the positioning structure to form a flow path at the center of the cleaning structure.

[0011] As an optional implementation, the cleaning structure includes a middle section and two main body sections disposed on both sides of the middle section. The two main body sections are respectively connected to two positioning structures, and the pitches of the main body sections and the middle section are different.

[0012] As an optional implementation, the pitch of the main body segment is smaller than the pitch of the intermediate segment.

[0013] As an optional implementation, the outer diameters of the intermediate section and the main body section are the same.

[0014] As an optional implementation, the outer diameter of the cleaning structure is adapted to the inner diameter of the nozzle.

[0015] As an optional implementation, the cleaning structure is a cylindrical helical spring.

[0016] As an optional implementation, the inner diameter of the positioning structure is adapted to the outer diameter of the valve needle.

[0017] As an optional implementation, the positioning structure is fixedly connected to the valve needle by welding.

[0018] A valve needle assembly includes the self-cleaning device described above.

[0019] A hot runner system includes a valve needle assembly as described above.

[0020] The beneficial effects of this utility model are as follows: The self-cleaning device, valve needle assembly, and hot runner system provided by this utility model include a cleaning structure and at least two positioning structures. The at least two positioning structures are coaxial and spaced apart, and can be fixed on the valve needle through the at least two positioning structures. The cleaning structure is arranged between two adjacent positioning structures and extends spirally along the axial direction of the positioning structure to form a flow path in the center of the cleaning structure. This allows the molten plastic in the nozzle flow channel hole to flow smoothly through the flow path in the center of the cleaning structure. Since the cleaning structure extends spirally along the axial direction of the positioning structure, it can clean the inner wall of the nozzle flow channel hole to avoid the molten plastic from stagnating on the inner surface of the nozzle flow channel hole, thereby avoiding the formation of dead glue and ensuring that the plastic parts will not have black or yellow defects, thus improving product quality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a perspective view of the self-cleaning device provided by this utility model;

[0023] Figure 2 This is a perspective view of the valve needle assembly provided by this utility model;

[0024] Figure 3 This is a front view of the valve needle assembly provided by this utility model;

[0025] Figure 4 This is a partial structural diagram of the valve needle assembly provided by this utility model (A).

[0026] Figure 5 This is a partial structural diagram of the valve needle assembly provided by this utility model (B part).

[0027] Figure 6 This is a schematic diagram of the structure of the hot runner system provided by this utility model;

[0028] Figure 7 This is a partial structural schematic diagram of the hot runner system provided by this utility model;

[0029] Figure 8 This is a schematic diagram of the structure of an existing needle valve type hot runner system;

[0030] Figure 9 This is a schematic diagram of the flow of plastic melt in existing technology.

[0031] In the picture:

[0032] 100. Self-cleaning device;

[0033] 200. Valve needle;

[0034] 300. Main firing nozzle;

[0035] 400. Distributor plate;

[0036] 500, Nozzle;

[0037] 600, cylinder;

[0038] 110. Clean structure;

[0039] 120. Positioning structure;

[0040] 130. Middle section;

[0041] 140. Main body section. Detailed Implementation

[0042] Please refer to the attached diagram below. Figures 1-9 This document explains the content of this utility model and its differences from existing technologies. The technical solutions (including preferred solutions) of this utility model are further described in detail below through accompanying drawings and examples of optional embodiments. It should be noted that any technical feature or solution in this embodiment is one or more of a variety of optional technical features or solutions. For the sake of brevity, this document cannot exhaustively list all alternative technical features and solutions of this utility model, nor is it convenient to emphasize that each implementation of a technical feature is one of multiple optional implementations. Therefore, those skilled in the art should understand that any technical means provided by this utility model can be replaced, or any two or more technical means or features provided by this utility model can be combined to obtain a new technical solution. No technical feature or solution in this embodiment limits the scope of protection of this utility model. The scope of protection of this utility model should include any alternative technical solutions that can be conceived by those skilled in the art without creative effort, as well as new technical solutions obtained by combining any two or more technical means or features provided by this utility model.

[0043] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] This invention provides a self-cleaning device, valve needle assembly, and hot runner system capable of cleaning the inner wall of the nozzle flow channel orifice and improving product quality.

[0046] The following is combined Figures 1-9 The technical solution provided by this utility model will be described in more detail.

[0047] This utility model provides a self-cleaning device 100, including a cleaning structure 110 and at least two positioning structures 120;

[0048] in:

[0049] At least two of the positioning structures 120 are coaxial and spaced apart. The cleaning structure 110 is disposed between two adjacent positioning structures 120 and extends spirally along the axial direction of the positioning structure 120 to form a flow path at the center of the cleaning structure 110.

[0050] The self-cleaning device 100 provided by this utility model includes a cleaning structure 110 and at least two positioning structures 120. The at least two positioning structures 120 are coaxial and spaced apart, and can be fixed on the valve needle 200 by the at least two positioning structures 120. The cleaning structure 110 is disposed between two adjacent positioning structures 120 and extends spirally along the axial direction of the positioning structure 120 to form a flow path in the center of the cleaning structure 110. This allows the molten plastic in the flow channel hole of the nozzle 500 to flow smoothly through the flow path in the center of the cleaning structure 110. Since the cleaning structure 110 extends spirally along the axial direction of the positioning structure 120, it can clean the inner wall of the flow channel hole of the nozzle 500, so as to avoid the molten plastic from stagnating on the inner surface of the flow channel hole of the nozzle 500, thereby avoiding the formation of dead glue and ensuring that the plastic parts will not have black or yellow defects, thus improving product quality.

[0051] It is understood that, in order to ensure that the cleaning structure 110 can clean the inner wall of the nozzle 500 flow channel orifice, the outer diameter of the cleaning structure 110 is preferably matched with the inner diameter of the nozzle 500 flow channel orifice, so as to clean the inner wall of the nozzle 500 flow channel orifice during the reciprocating movement of the valve needle 200, so as to avoid the plastic melt from stagnating on the inner surface of the nozzle 500 flow channel orifice.

[0052] It should be noted that the cylinder 600 can drive the valve needle 200 to move up and down, thereby closing and opening the gate. Since the positioning structure 120 is connected to the valve needle 200, the up and down movement of the valve needle 200 can drive the cleaning structure 110 to move up and down, thus completing the cleaning. The stroke of the valve needle 200 is controlled by the cylinder 600, and the up and down movement direction of the valve needle 200 can be quickly switched by controlling the air intake direction of the cylinder 600.

[0053] In some embodiments of this utility model, the cleaning structure 110 includes a middle section 130 and two main body sections 140 disposed on both sides of the middle section 130. The two main body sections 140 are respectively connected to the two positioning structures 120. The pitch of the main body sections 140 and the middle section 130 is different.

[0054] In some embodiments of the present invention described above, the cleaning structure 110 includes an intermediate section 130 and two main body sections 140 disposed on both sides of the intermediate section 130. The two main body sections 140 are respectively connected to the two positioning structures 120. The pitches of the main body sections 140 and the intermediate section 130 are different, so that the cleaning structure 110 can be reasonably arranged according to the stagnation of the plastic sol in the flow channel orifice of the nozzle 500, so as to improve the flow of the plastic sol in the flow channel orifice of the nozzle 500.

[0055] Understandably, there will be significant differences in the amount of molten plastic retained in the flow channel orifice of the nozzle 500 near the top, bottom and middle regions. Therefore, the cleaning structure 110 includes a middle section 130 and two main sections 140 disposed on both sides of the middle section 130. The two main sections 140 are respectively connected to the two positioning structures 120. The pitch of the main sections 140 and the middle section 130 is different, so that the cleaning structure 110 can be reasonably arranged according to the molten plastic retention in the flow channel orifice of the nozzle 500 to improve the flow of molten plastic in the flow channel orifice of the nozzle 500.

[0056] In some embodiments of this utility model, the pitch of the main body segment 140 is smaller than the pitch of the intermediate segment 130.

[0057] In some embodiments of the present invention described above, the flow rate of the molten plastic near the top and bottom of the nozzle 500 flow channel is relatively high, while the flow rate of the molten plastic in the middle region of the nozzle 500 flow channel is relatively low. Therefore, the pitch of the main body section 140 is smaller than the pitch of the middle section 130, thereby ensuring the cleaning effect of the inner wall of the nozzle 500 flow channel and improving product quality.

[0058] In some embodiments of this utility model, the outer diameters of the intermediate segment 130 and the main body segment 140 are the same.

[0059] In some of the embodiments of this utility model described above, the outer diameters of the intermediate section 130 and the main body section 140 are the same. Both the intermediate section 130 and the main body section 140 can fit well against the inner wall of the flow channel orifice of the nozzle 500, ensuring that the plastic melt has good flow in the center of the cleaning structure 110, while also cleaning the inner wall of the flow channel orifice of the nozzle 500 better, so as to avoid the plastic melt from stagnating on the inner surface of the flow channel orifice of the nozzle 500, thereby improving the cleaning effect of the inner surface of the flow channel orifice of the nozzle 500 and ensuring product quality.

[0060] In some embodiments of this utility model, the outer diameter of the cleaning structure 110 is adapted to the inner diameter of the nozzle 500.

[0061] In some of the embodiments of this utility model described above, the outer diameter of the cleaning structure 110 is adapted to the inner diameter of the nozzle 500, and the cleaning structure 110 is in close contact with the inner wall of the flow channel hole of the nozzle 500, which can better clean the inner wall of the flow channel hole of the nozzle 500, so as to avoid the plastic melt from flowing on the inner surface of the flow channel hole of the nozzle 500, improve the cleaning effect of the inner surface of the flow channel hole of the nozzle 500, and ensure product quality.

[0062] In some embodiments of this utility model, the cleaning structure 110 is a cylindrical helical spring.

[0063] In some embodiments of the present invention described above, the cleaning structure 110 is a cylindrical spiral spring. The cylindrical spiral springs are distributed in a spiral shape, and the outer diameter and inner diameter of the cylindrical spiral springs are exactly the same, as are the pitches. This allows for effective cleaning of the inner wall of the flow channel orifice of the nozzle 500, preventing molten plastic from stagnating on the inner surface of the flow channel orifice of the nozzle 500, thus improving the cleaning effect on the inner surface of the flow channel orifice of the nozzle 500 and ensuring product quality.

[0064] In some embodiments of this utility model, the inner diameter of the positioning structure 120 is adapted to the outer diameter of the valve needle 200.

[0065] In some of the embodiments of this utility model described above, the inner diameter of the positioning structure 120 is adapted to the outer diameter of the valve needle 200, which can fix the cleaning structure 110 on the valve needle 200, ensuring that the cleaning structure 110 can move up and down with the valve needle 200, thereby completing the cleaning of the inner wall of the flow channel hole of the nozzle 500 and improving product quality.

[0066] In some embodiments of this utility model, the positioning structure 120 and the valve needle 200 are fixedly connected by welding.

[0067] In some of the embodiments of this utility model described above, the positioning structure 120 is welded and fixed to the valve needle 200, which can ensure the fixing effect of the cleaning structure 110.

[0068] This utility model also provides a valve needle assembly, including the self-cleaning device 100 as described above.

[0069] The valve needle assembly provided by this utility model includes the self-cleaning device 100 as described above. The self-cleaning device 100 has the ability to clean the inner wall of the flow channel hole of the nozzle 500 through the cleaning structure 110, so as to avoid the plastic melt from flowing on the inner surface of the flow channel hole of the nozzle 500, thereby avoiding the formation of dead glue, ensuring that the plastic parts will not have black or yellow defects, and improving the product quality.

[0070] This invention also provides a hot runner system, including the valve needle assembly described above.

[0071] Example 1:

[0072] The hot runner system provided by this utility model includes a cylinder 600, a valve needle 200, a main nozzle 300, a flow divider 400, and a nozzle 500. The valve needle 200 and the nozzle 500 are coaxially arranged, and the valve needle 200 can reciprocate within the nozzle 500. The cylinder 600 is connected to the valve needle 200 to drive the valve needle 200 to reciprocate.

[0073] Furthermore, a self-cleaning device 100 is provided on the valve needle 200, the self-cleaning device 100 including a cleaning structure 110 and two positioning structures 120;

[0074] in:

[0075] The two positioning structures 120 are coaxial and spaced apart. The two positioning structures 120 are welded and fixed to the valve needle 200. The cleaning structure 110 is disposed between the two positioning structures 120. The cleaning structure 110 can be fixed to the valve needle 200 through the two positioning structures 120.

[0076] The cleaning structure 110 extends spirally along the axial direction of the positioning structure 120 to form a flow path at the center of the cleaning structure 110. This allows the molten plastic in the flow channel orifice of the nozzle 500 to flow smoothly through the flow path at the center of the cleaning structure 110. Since the cleaning structure 110 extends spirally along the axial direction of the positioning structure 120, it can clean the inner wall of the flow channel orifice of the nozzle 500, thereby preventing the molten plastic from stagnating on the inner surface of the flow channel orifice of the nozzle 500 and thus avoiding the formation of dead glue. This ensures that the plastic parts will not have black or yellow streaks, improving product quality.

[0077] Furthermore, the cleaning structure 110 includes a middle section 130 and two main body sections 140 disposed on both sides of the middle section 130. The two main body sections 140 are respectively connected to the two positioning structures 120. The middle section 130 and the main body sections 140 have the same outer diameter, and the outer diameters of the middle section 130 and the main body sections 140 are adapted to the inner diameter of the nozzle 500. The pitch of the main body section 140 is smaller than the pitch of the middle section 130.

[0078] The outer diameters of the intermediate section 130 and the main body section 140 are adapted to the inner diameter of the nozzle 500. The cleaning structure 110 is in close contact with the inner wall of the flow channel hole of the nozzle 500, which can better clean the inner wall of the flow channel hole of the nozzle 500, so as to avoid the plastic melt from flowing on the inner surface of the flow channel hole of the nozzle 500, improve the cleaning effect of the inner surface of the flow channel hole of the nozzle 500, and ensure product quality.

[0079] Furthermore, since there are significant differences in the amount of molten plastic retained in the top, bottom, and middle regions of the nozzle 500 flow channel orifice, the cleaning structure 110 includes a middle section 130 and two main sections 140 disposed on both sides of the middle section 130. The two main sections 140 are respectively connected to the two positioning structures 120. The pitch of the main sections 140 is smaller than that of the middle section 130, thereby enabling the cleaning structure 110 to be rationally arranged according to the molten plastic retention in the nozzle 500 flow channel orifice, so as to improve the flow of molten plastic in the nozzle 500 flow channel orifice.

[0080] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0081] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A self-cleaning device, characterized in that, Includes a cleaning structure and two positioning structures; in: The two positioning structures are coaxial and spaced apart. The cleaning structure is disposed between the two adjacent positioning structures and extends spirally along the axial direction of the positioning structure to form a flow path at the center of the cleaning structure.

2. The self-cleaning device according to claim 1, characterized in that, The cleaning structure includes a middle section and two main sections disposed on both sides of the middle section. The two main sections are respectively connected to two positioning structures, and the pitches of the main sections and the middle section are different.

3. The self-cleaning device according to claim 2, characterized in that, The pitch of the main body segment is smaller than the pitch of the intermediate segment.

4. The self-cleaning device according to claim 2, characterized in that, The middle section and the main body section have the same outer diameter.

5. The self-cleaning device according to claim 4, characterized in that, The outer diameter of the cleaning structure is adapted to the inner diameter of the nozzle.

6. The self-cleaning device according to claim 1, characterized in that, The cleaning structure is a cylindrical helical spring.

7. The self-cleaning device according to claim 1, characterized in that, The inner diameter of the positioning structure is adapted to the outer diameter of the valve needle.

8. The self-cleaning device according to claim 7, characterized in that, The positioning structure is fixedly connected to the valve needle by welding.

9. A valve needle assembly, characterized in that, Includes the self-cleaning device as described in any one of claims 1-8.

10. A hot runner system, characterized in that, Includes the valve needle assembly as described in claim 9.

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