Pin valve hot runner insert structure in compact space

Abstract

The utility model discloses a kind of insert structure for realizing needle valve hot runner in compact space, including axial through cavity, axial through cavity is penetrated between insert two ends, axial through cavity sequentially includes first circular table cavity, second circular table cavity, cylindrical cavity, first circular table cavity and second circular table cavity junction form first step surface;Outer arm conical surface, located in the outer wall of insert;Wherein, to the direction of the one end with cylindrical cavity in insert, the inner diameter of first circular table cavity, the inner diameter of second circular table cavity, the outer diameter of outer arm conical surface are gradually small, the respective conical top angle of first circular table cavity, second circular table cavity, outer arm conical surface gradually small;One end of insert can be abutted with hot nozzle head, axial through cavity can be supplied with hot runner valve needle to pass through. Adopt the utility model in compact space to extend valve needle contact length, improve limit stability, ensure needle valve action precision and glue point forming regularity.

Description

Technical Field

[0001] This utility model relates to the field of injection mold inserts, specifically to an insert structure that realizes a needle valve hot runner within a compact space. Background Technology

[0002] In the field of injection molding, needle valve hot runner systems are widely used due to their advantages such as high-efficiency molding and stable product quality. However, in mold scenarios with compact space layouts, traditional related structures have significant limitations. Some existing hot runner nozzles lack sufficient extension adaptability, making it difficult to accurately match the positioning requirements of the mold core and the product's glue position, easily leading to problems such as irregular injection point molding and poor sealing performance. In addition, there is room for improvement in the assembly coordination between hot runner components and the mold. For example, disassembly and maintenance are cumbersome, and the adaptability for embedded injection molded products is lacking, resulting in increased mold debugging costs and affecting production efficiency and product yield. Therefore, a compact and highly adaptable insert structure is needed to overcome these shortcomings. Utility Model Content

[0003] The problem to be solved by this utility model is to provide an insert structure that realizes the hot runner of a needle valve in a compact space.

[0004] To solve the above problems, this utility model provides an insert structure for realizing the hot runner of a needle valve within a compact space. To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problems is as follows: An insert structure for realizing a needle valve hot runner in a compact space includes: an axially penetrating cavity, with the axially penetrating cavity extending between the two ends of the insert, the axially penetrating cavity sequentially including a first frustum cavity, a second frustum cavity, and a cylindrical cavity, with a first stepped surface formed at the junction of the first frustum cavity and the second frustum cavity; and an outer conical surface located on the outer wall of the insert; wherein, towards the end of the insert containing the cylindrical cavity, the inner diameter of the first frustum cavity, the inner diameter of the second frustum cavity, and the outer diameter of the outer conical surface all gradually decrease, and the cone apex angles corresponding to the first frustum cavity, the second frustum cavity, and the outer conical surface gradually decrease; one end of the insert can abut against a hot nozzle, and the axially penetrating cavity allows the hot runner valve needle to pass through.

[0005] As a further improvement of this utility model, the cone apex angle corresponding to the first frustum cavity ranges from 85° to 95°, the cone apex angle corresponding to the second frustum cavity ranges from 27° to 33°, and the cone apex angle corresponding to the outer arm conical surface ranges from 5° to 7°.

[0006] As a further improvement of this utility model, the first stepped surface is perpendicular to the axis of the insert, and at one end of the insert, the inner wall of the first frustum cavity and the outer conical surface meet at an acute angle.

[0007] As a further improvement of this utility model, the insert includes an integrally axially distributed first tubular segment and a second tubular segment, the outer diameter of the first tubular segment being larger than the outer diameter of the second tubular segment; the first frustum cavity and the second frustum cavity are respectively located within the first tubular segment, and the cylindrical cavity is respectively located within the second tubular segment; the outer arm conical surface is located on the outer wall of the first tubular segment.

[0008] As a further improvement of this utility model, a second stepped surface is formed at the junction of the first tubular segment and the second tubular segment, and the second stepped surface is perpendicular to the axis of the insert.

[0009] As a further improvement of this utility model, an inner rounded corner is formed at the junction of the second stepped surface and the second tubular segment, and an outer rounded corner is formed at one end of the second tubular segment.

[0010] As a further improvement of this utility model, the hot nozzle makes a concave-convex contact with the first frustum cavity, and the outer diameter of the hot flow channel valve needle is not greater than the inner diameter of the cylindrical cavity.

[0011] As a further improvement of this utility model, the outer arm conical surface can be in concave-convex contact with the female mold core, the second tubular segment is exposed from the female mold core, and the side of the female mold core away from the hot nozzle is provided with an injection molding product glue position, the injection molding product glue position having a recess that can be in concave-convex contact with the second tubular segment.

[0012] As a further improvement of this utility model, the boundary line between the second frustum cavity and the cylindrical cavity is located at the same cross-sectional position of the insert as the second step surface.

[0013] The beneficial technical effects of the insert structure for realizing the hot runner of the needle valve in a compact space using the method of this application are as follows: It effectively solves the technical problem of insufficient stability of needle valve limit in compact spaces.

[0014] Without increasing the overall installation space of the insert, the contact length between the positioning part and the valve needle is extended by optimizing the insert structure, which can improve the limiting ability of the valve needle, prevent the valve needle from deviating during long-term use, ensure the precise and controllable action of the needle valve, and adapt to the installation requirements of compact space.

[0015] In addition, it can improve the coaxiality accuracy between the valve needle and the injection port. The reasonable design of the insert structure provides stable guidance for the valve needle, ensuring precise alignment between the valve needle and the injection port, reducing quality problems such as incomplete sealing and uneven coloring of injection molded products, and improving the molding consistency of injection molded products. It is especially suitable for injection molding scenarios with high precision requirements.

[0016] Finally, it optimizes the melt flow and reduces wear and tear. The fit between the insert and the runner reduces dead zones in melt flow, lowering the risk of residual melt and making the injection molding process smoother. Simultaneously, it reduces wear on the valve pin caused by lateral impacts or misalignment, reducing heat loss, extending the service life of the insert and valve pin, and improving the overall reliability of the hot runner system. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a longitudinal sectional view of one embodiment of the present invention; Figure 2 This is a perspective view of one embodiment of the present utility model; Figure 3 This is an application diagram of one embodiment of the present invention; Figure 4 This is a partial enlarged view of point A in one embodiment of this utility model; Figure 5 This is an application effect diagram of one embodiment of this utility model; Figure 6 This is a partial enlarged view of section B of one embodiment of this utility model; Figure 7 This is an application effect diagram of one embodiment of this utility model.

[0019] 1-Hot runner system; 2-Backing plate; 3-Baffle; 4-Mold core; 5-Insertion point for injection molded product; 6-Mold insert; 7-Insertion terminal; 8-Hot runner valve pin; 9-Hot nozzle; 10-Insert; 101-First frustum cavity; 102-First stepped surface; 103-Second frustum cavity; 104-Cylindrical cavity; 105-First tubular section; 106-Second stepped surface; 107-Second tubular section; 108-Inner fillet; 109-Outer fillet; 11-Inlet point; 12-Main cold runner; 13-Secondary cold runner. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to specific embodiments: To achieve the purpose of this utility model, please refer to Figures 1 to 4An insert structure for realizing a needle valve hot runner in a compact space includes: an axially penetrating cavity, through which the insert 10 is located between its two ends. The axially penetrating cavity sequentially includes a first frustum cavity 101, a second frustum cavity 103, and a cylindrical cavity 104 along a unidirectional axis. A first stepped surface 102 is formed at the junction of the first frustum cavity 101 and the second frustum cavity 103. An outer conical surface is located on the outer wall of the insert 10. Specifically, towards the end of the insert 10 containing the cylindrical cavity 104, the inner diameters of the first frustum cavity 101, the second frustum cavity 103, and the outer diameter of the outer conical surface gradually decrease, as do the cone apex angles corresponding to the first frustum cavity 101, the second frustum cavity 103, and the outer conical surface. Figure 4 As shown, one end of the insert 10 can abut against the hot nozzle 9, and the axial through cavity allows the hot flow channel valve needle 8 to pass through.

[0021] Figures 3 to 5 This is a diagram showing the application of the insert 10 in the mold. Figures 5 to 7 This is a schematic diagram after injection molding is completed. Figure 5 , Figure 7 The image shows the residual plastic material formed in the main cold runner 12 and the secondary cold runner 13 after injection molding.

[0022] like Figure 3 As shown, insert 10 is fixedly applied in the injection mold. The insert is located inside the female mold core 4, and female mold insert 6 is provided inside the female mold core 4 and around the hot runner 9. A pad 2 is provided above the female mold core 4, and a baffle 3 is provided on the side of the female mold core 4.

[0023] like Figure 6 As shown, after the hot runner valve needle 8 is withdrawn, molten plastic is injected and filled, and the inner cavity of the insert 10 forms the injection point 11.

[0024] like Figure 4 As shown, an embedded injection terminal 7 is also embedded in the injection molding product's glue position 5.

[0025] in addition, Figure 7 yes Figure 5 A three-dimensional perspective.

[0026] The beneficial effects of adopting the above technical solution are as follows: Insert 10, as an independent small part, is added to the injection mold, resulting in a compact overall structure. Insert 10 abuts against one end of the hot runner 9, and the interior of Insert 10 also includes a cavity through which the heating flow channel valve needle 8 moves. In a sense, Insert 10 is equivalent to an independent extension of a certain section of the hot runner 9. The inner wall contour of Insert 10 helps to define and form the overall shape contour of the injection point 11 during final injection molding. The outer wall contour of Insert 10 facilitates the positioning and replacement with the mold core 4, and facilitates the positioning with the injection molding product's glue position 5.

[0027] By designing an axially penetrating cavity that sequentially includes a first frustum cavity 101, a second frustum cavity 103, and a cylindrical cavity 104, and in conjunction with an outer arm conical surface structure, the insert 10 can simultaneously achieve stable contact with the hot nozzle 9 and precise guidance of the hot runner valve needle 8 within a compact space. This effectively extends the contact and limiting length of the valve needle 8, enhances its positioning stability in narrow spaces, and thus ensures precise needle valve action and regular molding of the glue injection point 11.

[0028] In some other embodiments of this utility model, the cone apex angle corresponding to the first frustum cavity 101 ranges from 85° to 95°, the cone apex angle corresponding to the second frustum cavity 103 ranges from 27° to 33°, and the cone apex angle corresponding to the outer arm cone surface ranges from 5° to 7°.

[0029] like Figure 1 As shown, preferably, the cone apex angle range corresponding to the first frustum cavity 101 is 90°, the cone apex angle range corresponding to the second frustum cavity 103 is 30°, and the cone apex angle range corresponding to the outer arm cone surface is 6°.

[0030] The beneficial effects of adopting the above technical solution are: the optimized angle makes the inner cavity transition smooth and the outer wall taper appropriate, which not only optimizes the melt flow path and reduces stagnation, but also ensures the fit between the insert 10 and the female mold core 4 and the ease of disassembly and assembly, thereby improving the molding quality of the overall system.

[0031] In some other embodiments of this utility model, the first stepped surface 102 is perpendicular to the axis of the insert 10, and at one end of the insert 10, the inner wall of the first frustum cavity 102 and the outer conical surface meet at an acute angle. That is, the inner diameter of the first frustum cavity at one end of the insert 10 is equal to the outer diameter of the insert 10 at that point.

[0032] The beneficial effects of adopting the above technical solution are: it enhances the structural strength and sealing of the end of the insert 10, makes the connection of the hot nozzle 9 more stable, avoids displacement or leakage caused by uneven force, and facilitates the smooth transition of the adhesive to the injection point 11.

[0033] like Figure 1 As shown, in some other embodiments of this utility model, the insert 10 includes an integrally axially distributed first tubular segment 105 and a second tubular segment 107, wherein the outer diameter of the first tubular segment 105 is larger than the outer diameter of the second tubular segment 107. A first frustum cavity 101 and a second frustum cavity 103 are located within the first tubular segment 105, and a cylindrical cavity 104 is located within the second tubular segment 107. The outer conical surface of the outer arm is located on the outer wall of the first tubular segment 105.

[0034] The beneficial effects of adopting the above technical solution are: clear structural hierarchy, easy processing and assembly, and enhanced positioning stability of insert 10 in mold core.

[0035] In some other embodiments of the present invention, a second stepped surface 106 is formed at the junction of the first tubular segment 105 and the second tubular segment 107, and the second stepped surface 106 is perpendicular to the axis of the insert 10.

[0036] The beneficial effects of adopting the above technical solution are: the second step surface 106 provides a clear axial positioning reference for the installation of the insert 10 in the female mold core 4, prevents the insert 10 from moving axially during the injection molding process, and ensures its positional accuracy.

[0037] In some other embodiments of the present invention, an inner rounded corner 108 is formed at the junction of the second stepped surface 106 and the second tubular segment 107, and an outer rounded corner 109 is formed at one end of the insert 10 of the second tubular segment 107.

[0038] The beneficial effects of adopting the above technical solution are: the rounded corners effectively reduce stress concentration, improve the durability of the insert 10, facilitate demolding, and avoid scratching the glue position 5 embedded in the injection molded product.

[0039] In some other embodiments of this utility model, the hot nozzle 9 is in concave-convex contact with the first frustum cavity 101, and the outer diameter of the hot flow channel valve needle 8 is not greater than the inner diameter of the cylindrical cavity 104.

[0040] The beneficial effects of adopting the above technical solution are: the hot nozzle 9 and the first frustum cavity 101 make concave-convex contact and ensure that the outer diameter of the hot runner valve needle 8 is not greater than the inner diameter of the cylindrical cavity 104, thereby achieving a tight fit and precise alignment between the hot nozzle 9, the insert 10 and the valve needle 8, improving the sealing performance, reducing glue leakage and wear, and ensuring the stability of the injection molding process.

[0041] like Figure 4 As shown, in some other embodiments of this utility model, the outer arm conical surface can be in concave-convex contact with the female mold core 4, the second tubular segment 107 is exposed from the female mold core 4, and the side of the female mold core 4 away from the hot nozzle 9 is provided with an injection molding product glue position 5, which has a recess that can be in concave-convex contact with the second tubular segment 107.

[0042] The beneficial effects of adopting the above technical solution are: the outer arm conical surface matches the concave and convex shape of the female mold core 4, the second tubular section 107 protrudes from the female mold core 4 and matches the recess of the injection molded product glue position 5, so that the insert 10 is accurately positioned in the mold and easy to disassemble and assemble. At the same time, it directly participates in the definition of the shape of the molding area, ensuring that the glue injection point 11 has a regular shape and meets the high precision requirements of the embedded injection molding.

[0043] In some other embodiments of this utility model, the boundary line between the second frustum cavity 103 and the cylindrical cavity 104 is located at the same cross-sectional position as the second step surface 106 in the insert 10.

[0044] The beneficial effects of adopting the above technical solution are: aligning the internal flow channel with the external structure in the axial position, further optimizing the stress distribution of the insert 10 and the continuity of the melt flow, and improving the overall structure.

[0045] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. An insert structure for realizing a needle valve hot runner within a compact space, characterized in that, include: An axially penetrating cavity is formed between the two ends of the insert. The axially penetrating cavity includes a first frustum cavity, a second frustum cavity, and a cylindrical cavity in sequence. A first step surface is formed at the junction of the first frustum cavity and the second frustum cavity. The outer conical surface is located on the outer wall of the insert; In the direction towards the end of the insert containing the cylindrical cavity, the inner diameter of the first frustum cavity, the inner diameter of the second frustum cavity, and the outer diameter of the outer arm conical surface all gradually decrease, and the cone apex angles corresponding to the first frustum cavity, the second frustum cavity, and the outer arm conical surface gradually decrease. One end of the insert can abut against the hot nozzle, and the axial through cavity allows the hot flow channel valve needle to pass through.

2. The insert structure for realizing a needle valve hot runner in a compact space according to claim 1, characterized in that: The cone apex angle corresponding to the first frustum cavity ranges from 85° to 95°, the cone apex angle corresponding to the second frustum cavity ranges from 27° to 33°, and the cone apex angle corresponding to the outer arm conical surface ranges from 5° to 7°.

3. The insert structure for realizing a needle valve hot runner in a compact space according to claim 1, characterized in that: The first step surface is perpendicular to the axis of the insert, and at one end of the insert, the inner wall of the first frustum cavity and the outer arm cone surface meet at an acute angle.

4. The insert structure for realizing a needle valve hot runner in a compact space according to claim 1, characterized in that: The insert includes an integrally axially distributed first tubular segment and a second tubular segment, wherein the outer diameter of the first tubular segment is larger than the outer diameter of the second tubular segment; The first frustum cavity and the second frustum cavity are located within the first tubular segment, and the cylindrical cavity is located within the second tubular segment. The outer conical surface is located on the outer wall of the first tubular segment.

5. The insert structure for realizing a needle valve hot runner in a compact space according to claim 4, characterized in that: A second stepped surface is formed at the junction of the first tubular segment and the second tubular segment, and the second stepped surface is perpendicular to the axis of the insert.

6. The insert structure for realizing a needle valve hot runner in a compact space according to claim 5, characterized in that: The second step surface forms an inner rounded corner at the junction with the second tubular segment, and the second tubular segment forms an outer rounded corner at one end of the insert.

7. The insert structure for realizing a needle valve hot runner in a compact space according to claim 1, characterized in that: The hot nozzle makes contact with the concave and convex shape of the first frustum cavity, and the outer diameter of the hot flow channel valve needle is not greater than the inner diameter of the cylindrical cavity.

8. The insert structure for realizing a needle valve hot runner in a compact space according to claim 4, characterized in that: The outer conical surface can make concave-convex contact with the female mold core, the second tubular segment is exposed from the female mold core, and the side of the female mold core away from the hot nozzle is provided with an injection molding product injection position, the injection molding product injection position has a recess that can make concave-convex contact with the second tubular segment.

9. The insert structure for realizing a needle valve hot runner in a compact space according to claim 5, characterized in that: The boundary line between the second frustum cavity and the cylindrical cavity is located on the same cross-sectional position of the insert as the second step surface.

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