Injection mold runner nozzle

Abstract

The utility model relates to the technical field of nozzles for injection molding, in particular to an injection mold runner nozzle, which comprises a shell, a nozzle body and a nozzle cover, the spraying assembly is detachably arranged at the bottom end of the hollow flow channel; the valve pin is arranged at the hollow flow channel in a sliding manner; wherein a first accommodating groove and a second accommodating groove are formed in the bottom end of the hollow flow channel; the spraying assembly comprises a valve nozzle assembly arranged at the first containing groove, a third containing groove is formed in the top end of the valve nozzle assembly, and a penetrating spraying channel is formed in the lower side of the valve nozzle assembly. The fixing piece is detachably arranged in the second containing groove, is arranged in a hollow penetrating mode and is arranged on the outer side of the valve nozzle assembly in a sleeving mode; the supporting ring is clamped to the third containing groove, a first through hole is formed in the middle of the supporting ring, two or more second through holes are evenly formed in the peripheral side of the first through hole, and the second through holes communicate with the hollow flow channel and the avoiding part correspondingly. The utility model discloses a runner nozzle of an injection mold, and aims to solve the problem that a valve pin of an injection nozzle in the prior art is easy to deviate in the radial direction.

Description

Technical Field

[0001] This utility model relates to the field of nozzle technology for injection molding, and more specifically, to a nozzle for the flow channel of an injection mold. Background Technology

[0002] Injection molding technology, as a core process in the production of plastic products in modern industry, directly impacts product quality and production efficiency through the performance of its core component, the runner nozzle. Traditional injection mold runner nozzles typically consist of a housing, a valve pin, and a single valve assembly. Molten resin controls the opening and closing of the injection port through the rising and falling motion of the valve pin. However, with the increasing demand for high-precision injection molded parts, existing technologies are gradually revealing sealing failure problems caused by deviations in the valve pin's movement trajectory.

[0003] Traditional nozzles employ a single-layer valve structure, with the fit tolerance between the valve pin and the injection channel typically exceeding 0.02mm. Under continuous operation, the valve pin is prone to radial displacement due to the lateral impact force of the molten resin. Experimental data shows that when the valve pin displacement exceeds 0.015mm, localized wear occurs on the sealing surface of the injection channel, leading to a resin leakage rate of 0.3%-0.5% (compared to 0.05% in the initial state of a new mold). More seriously, the worn valve pin forms an asymmetrical gap with the injection channel, further exacerbating the vicious cycle of trajectory deviation. Existing technologies attempt to improve alignment by thickening the valve pin wall (e.g., CN201880123.5), but this results in a 15%-20% reduction in the flow channel cross-sectional area.

[0004] To address the aforementioned technical challenges, there is an urgent need in this field for a flow channel nozzle structure that can achieve high-precision guidance. Utility Model Content

[0005] The main purpose of this invention is to propose a flow channel nozzle for injection molds, which aims to solve the problem that the valve pin of the injection nozzle in the prior art is prone to radial displacement.

[0006] To solve the above technical problems, a flow channel nozzle for injection molds is proposed, comprising: a shell with a hollow flow channel for connecting to molten resin;

[0007] The spraying assembly, detachably mounted at the bottom end of the hollow flow channel, is used to output molten resin;

[0008] A valve pin is slidably disposed in the hollow flow channel and is used to control the opening and closing of the injection assembly;

[0009] in,

[0010] The bottom end of the hollow flow channel is provided with a first receiving groove and a second receiving groove. The position of the first receiving groove is higher than that of the second receiving groove. The diameter of the first receiving groove is larger than the inner diameter of the hollow flow channel, and the diameter of the first receiving groove is smaller than that of the second receiving groove.

[0011] The jetting assembly includes:

[0012] A valve assembly is provided at the first receiving groove, with a third receiving groove at the top. A through injection channel is provided on the lower side of the third receiving groove. The inner diameter of the injection channel is equal to the outer diameter of the valve pin. A clearance part is provided between the third receiving groove and the injection channel.

[0013] The fastener is detachably installed in the second receiving groove, is hollow and penetrating, is sleeved on the outside of the valve nozzle assembly, and its top end abuts against the valve nozzle assembly;

[0014] The support ring is snapped into the third receiving groove. It has a first through hole in the middle and two or more second through holes evenly distributed around the through hole. The inner diameter of the first through hole is equal to the diameter of the valve pin. The second through holes are respectively connected to the hollow flow channel and the clearance part.

[0015] In any of the above technical solutions, the valve assembly further includes:

[0016] The first valve nozzle is provided with the third receiving groove, the injection channel and the clearance part;

[0017] The second valve nozzle has a fourth receiving groove and a guide channel. The first valve nozzle is engaged in the fourth receiving groove and extends downward through the guide channel. The fixing member abuts against the second valve nozzle.

[0018] In any of the above technical solutions, the first valve nozzle is made of tungsten carbide or ceramic, and the second valve nozzle is made of graphene copper alloy.

[0019] In any of the above technical solutions, further, an annular air passage is provided on the side wall of the first accommodating groove, and two or more air holes are uniformly provided on the outer side of the annular air passage.

[0020] In any of the above technical solutions, the second receiving groove is provided with an internal thread on its side wall, and the outer side wall of the fixing member is provided with an external thread that is adapted to it.

[0021] In any of the above technical solutions, the bottom end of the valve pin and the bottom end of the injection channel of the first valve nozzle are provided with mutually compatible conical surfaces.

[0022] The beneficial effects are:

[0023] 1. The injection mold flow channel nozzle of this utility model, through the stepped layout of the first receiving groove (diameter > hollow flow channel) and the second receiving groove (diameter > first receiving groove), and in conjunction with the first through hole of the support ring (inner diameter = valve pin diameter), controls the radial offset of the valve pin within ±0.005mm.

[0024] 2. The conical surface design of the bottom of the valve pin and the bottom of the first valve nozzle allows the valve pin to automatically correct the centering angle when it falls. The measured uniformity of the contact pressure distribution on the sealing surface is improved to 92%, and the leakage rate is reduced to below 0.02%.

[0025] 3. The first valve nozzle component uses tungsten carbide to resist valve pin impact, while the second valve nozzle component uses graphene copper alloy to accelerate heat dissipation. Tests show that this combined structure extends the valve nozzle assembly life to 5 million cycles and reduces the temperature gradient to 15℃ / cm.

[0026] 4. The second through hole of the support ring and the avoidance part form a diversion channel, which reduces the back pressure when the resin passes through and improves the stability of the flow rate.

[0027] 5. The first valve can be replaced separately without affecting the second valve, thus reducing maintenance costs. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a three-dimensional structural diagram of an injection mold flow channel nozzle according to an embodiment of the present utility model;

[0030] Figure 2 This is a cross-sectional structural diagram of a nozzle in an injection mold flow channel according to an embodiment of the present invention;

[0031] Figure 3 yes Figure 2 A magnified schematic diagram of the local structure at point A;

[0032] Figure 4 This is an exploded structural diagram of an injection mold flow channel nozzle according to an embodiment of the present invention.

[0033] The annotations in the attached figures are explained as follows:

[0034] 1. Outer shell; 101. Hollow flow channel; 102. First receiving groove; 103. Second receiving groove; 104. Annular air passage; 105. Air hole;

[0035] 2. Spraying assembly;

[0036] 201. Valve assembly;

[0037] 2011, First valve nozzle; 20111, Third receiving groove; 20112, Injection channel; 20113, Clearance section;

[0038] 2012, Second valve nozzle; 20121, Fourth receiving groove; 20122, Guide channel;

[0039] 202. Fasteners;

[0040] 203. Support ring; 2031. First through hole; 2032. Second through hole;

[0041] 3. Valve pin; 301. Conical part. Detailed Implementation

[0042] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of the embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0043] It should be noted that, as shown in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.

[0044] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0047] The following embodiments will be used to provide a detailed description of an injection mold runner nozzle according to this application.

[0048] In this embodiment, as Figures 1 to 4 As shown, the injection mold runner nozzle includes: a housing 1 with a hollow runner 101 for connecting to molten resin;

[0049] The spraying assembly 2 is detachably installed at the bottom end of the hollow flow channel 101 for outputting molten resin;

[0050] Valve pin 3 is slidably disposed in the hollow flow channel 101 and is used to control the opening and closing of the injection assembly 2.

[0051] in,

[0052] The bottom end of the hollow flow channel 101 is provided with a first receiving groove 102 and a second receiving groove 103. The position of the first receiving groove 102 is higher than the position of the second receiving groove 103. The diameter of the first receiving groove 102 is larger than the inner diameter of the hollow flow channel 101, and the diameter of the first receiving groove 102 is smaller than the diameter of the second receiving groove 103.

[0053] Injection assembly 2 includes:

[0054] The valve assembly 201 is located at the first receiving groove 102, and has a third receiving groove 20111 at the top. A through injection channel 20112 is provided on the lower side of the third receiving groove 20111. The inner diameter of the injection channel 20112 is equal to the outer diameter of the valve pin 3. A clearance part 20113 is provided between the third receiving groove 20111 and the injection channel 20112.

[0055] The fastener 202 is detachably disposed in the second receiving groove 103, is hollow and passes through, is sleeved on the outside of the valve assembly 201, and its top end abuts against the valve assembly 201.

[0056] The support ring 203 is snapped into the third receiving groove 20111. A first through hole 2031 is provided in the middle, and two or more second through holes 2032 are evenly provided around the through hole. The inner diameter of the first through hole 2031 is equal to the diameter of the valve pin 3. The second through holes 2032 are respectively connected to the hollow flow channel 101 and the avoidance part 20113.

[0057] In this technical solution, the outer shell 1 is machined from mold steel. The internal hollow flow channel 101 is formed by deep hole drilling with a diameter of Φ16mm. The diameter tolerance of the flow channel is controlled within ±0.01mm. The top of the hollow flow channel 101 has an outward expansion with a diameter of Φ32mm, and a tapered surface is used to transition between it and the lower hollow flow channel 101. A stepped receiving structure is machined at the bottom of the hollow flow channel 101: the first receiving groove 102 has a diameter of Φ27mm and a depth of 20mm; the second receiving groove 103 is located below the first receiving groove 102, has a diameter of Φ40mm and a depth of 30mm, and the sidewall is machined with M38×2 internal threads.

[0058] The spray assembly 2 is snapped into the first receiving groove 102 and extends downward through the second receiving groove 103 to the lower side of the outer casing 1. The spray assembly 2 is coaxially arranged with the outer casing 1. A stepped surface is provided on the outer side of the spray assembly 2 near the first receiving groove 102. This stepped surface is placed inside the second receiving groove 103. The fixing member 202 is threaded to the internal thread of the outer casing 1 and abuts against the stepped surface to fix the position of the spray assembly 2. The top surface of the spray assembly 2 is provided with a third receiving groove 20111. The third receiving groove 20111 has a diameter of Φ17mm and a depth of 10mm. The center of the spray assembly 2 is provided with a downward-through spray channel 20112 with a diameter of Φ10mm. The connection between the spray channel 20112 and the third receiving groove 20111 is provided with a 45° chamfer with a width of 1.5mm. This chamfer forms the aforementioned clearance part 20113.

[0059] The support ring 203 has a circular structure with an outer diameter of Φ16.95±0.05mm and a height of 10mm. It has a centrally located, vertically penetrating first through-hole 2031 with a diameter of Φ10mm. Ten evenly distributed second through-holes 2032 are located around the periphery of the first through-hole 2031, penetrating the support ring 203 vertically. The shape of the second through-holes 2032 is approximately trapezoidal. This allows molten resin to be transported through the hollow channel → second through-holes 2032 → clearance section 20113 via the injection channel 20112.

[0060] It is worth mentioning that the valve pin 3 is usually driven up and down by an external drive mechanism (such as a hydraulic mechanism, a pneumatic mechanism, etc.).

[0061] In this embodiment, the valve assembly 201 includes:

[0062] The first valve nozzle component 2011 is provided with a third receiving groove 20111, a spray channel 20112 and a clearance part 20113;

[0063] The second valve nozzle 2012 is provided with a fourth receiving groove 20121 and a guide channel 20122. The first valve nozzle 2011 is engaged in the fourth receiving groove 20121 and extends downward through the guide channel 20122. The fixing member 202 abuts against the second valve nozzle 2012.

[0064] In this technical solution, the first valve nozzle 2011 is formed using tungsten carbide powder metallurgy, with a mirror-polished surface to Ra0.24μm. A third receiving groove 20111 with a depth of Φ17mm×10mm is machined at the top, and a Φ10mm injection channel 20112 is machined at the bottom. A 45° conical surface is formed by a narrowing orifice at the end. Avoidance portions 20113 are provided at the bottom corner of the third receiving groove 20111 and the top corner of the injection channel 20112. In some technical solutions, the first valve nozzle 2011 is a combined cylindrical structure with an upper outer diameter of Φ20mm and a lower outer diameter of Φ12mm.

[0065] The second valve nozzle component 2012 is formed using powder metallurgy. It has an internally machined fourth receiving groove 20121 with a depth of Φ20mm×14mm, and a bottom-machined guide channel 20122 with a diameter of Φ11.95±0.05mm. It is detachably coupled with the first valve nozzle component 2011. In some technical solutions, the upper outer diameter of the second valve nozzle component 2012 is Φ27mm, and the lower outer diameter is Φ22mm.

[0066] In some technical solutions, a 0.3mm thick copper-based elastic gasket is provided at the bottom of the fourth receiving groove 20121.

[0067] In this embodiment, the first valve nozzle 2011 is made of tungsten carbide or ceramic, and the second valve nozzle 2012 is made of graphene copper alloy.

[0068] In this embodiment, an annular air passage 104 is provided on the side wall of the first receiving groove 102, and two or more air holes 105 are uniformly provided on the outer side of the annular air passage 104.

[0069] In this technical solution, the annular air passage 104 is located 2-5mm above the stepped surface between the first receiving groove 102 and the second receiving groove 103, and is located on the side wall of the first receiving groove 102. The air holes 105 are six circular holes that extend radially outward evenly around the circumference, with a diameter of Φ1.5-2mm, and their inner sides are all connected to the annular air passage 104.

[0070] In use, an external cooling structure is connected, for example: some of the air holes 105 are connected to a 0.8MPa compressed air source through an interface. The compressed air enters the annular air passage 104 through the air holes 105, forming a uniform circumferential airflow. Then the airflow is ejected from another air hole 105 that is not connected to an air source, and washes the outer wall surface of the second valve nozzle at a certain speed: carrying away the heat accumulated in the graphene copper alloy parts and preventing the local temperature from exceeding 250°C.

[0071] In this embodiment, the side wall of the second receiving groove 103 is provided with an internal thread, and the outer side wall of the fastener 202 is provided with an external thread that is adapted to it.

[0072] In this embodiment, the bottom end of the valve pin 3 and the bottom end of the injection channel 20112 of the first valve nozzle 2011 are provided with mutually compatible conical surfaces 301.

[0073] It is worth mentioning that the aforementioned aperture and depth can be enlarged or reduced proportionally or unequally.

[0074] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A nozzle for an injection mold runner, characterized in that, include: The outer shell (1) is provided with a hollow flow channel (101) for docking with molten resin; The spraying assembly (2) is detachably disposed at the bottom end of the hollow flow channel (101) for discharging molten resin; A valve pin (3) is slidably disposed in the hollow flow channel (101) for controlling the opening and closing of the injection assembly (2); in, The bottom end of the hollow flow channel (101) is provided with a first receiving groove (102) and a second receiving groove (103). The position of the first receiving groove (102) is higher than the position of the second receiving groove (103). The diameter of the first receiving groove (102) is larger than the inner diameter of the hollow flow channel (101), and the diameter of the first receiving groove (102) is smaller than the diameter of the second receiving groove (103). The injection assembly (2) includes: A valve assembly (201) is disposed at the first receiving groove (102), and a third receiving groove (20111) is provided at the top. A through injection channel (20112) is provided on the lower side of the third receiving groove (20111). The inner diameter of the injection channel (20112) is equal to the outer diameter of the valve pin (3). A clearance part (20113) is provided between the third receiving groove (20111) and the injection channel (20112). The fastener (202) is detachably disposed in the second receiving groove (103), is hollow and through, is sleeved on the outside of the valve assembly (201), and its top end abuts against the valve assembly (201); The support ring (203) is snapped into the third receiving groove (20111), and has a first through hole (2031) in the middle. Two or more second through holes (2032) are evenly arranged around the through hole. The inner diameter of the first through hole (2031) is equal to the diameter of the valve pin (3). The second through holes (2032) are respectively connected to the hollow flow channel (101) and the clearance part (20113).

2. The injection mold runner nozzle according to claim 1, characterized in that, The valve assembly (201) includes: The first valve nozzle (2011) is provided with the third receiving groove (20111), the injection channel (20112) and the clearance part (20113); The second valve nozzle (2012) is provided with a fourth receiving groove (20121) and a guide channel (20122). The first valve nozzle (2011) is engaged in the fourth receiving groove (20121) and extends downward through the guide channel (20122). The fixing member (202) abuts against the second valve nozzle (2012).

3. The injection mold runner nozzle according to claim 2, characterized in that, The first valve part (2011) is made of tungsten carbide or ceramic, and the second valve part (2012) is made of graphene copper alloy.

4. The injection mold runner nozzle according to claim 2, characterized in that, The first receiving groove (102) has an annular air passage (104) on its side wall, and two or more air holes (105) are evenly provided on the outer side of the annular air passage (104).

5. The injection mold runner nozzle according to claim 1, characterized in that, The second receiving groove (103) has an internal thread on its side wall, and the fastener (202) has an external thread on its outer side wall that is adapted to it.

6. The injection mold runner nozzle according to claim 2, characterized in that, The bottom end of the valve pin (3) and the bottom end of the injection channel (20112) of the first valve nozzle (2011) are provided with mutually compatible conical surfaces (301).

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