Hot runner nozzle assembly

Abstract

The utility model relates to the technical field of nozzle assembly, and discloses a hot runner nozzle assembly which comprises a nozzle and a nozzle cap, the contact surface of the nozzle and the nozzle cap is recessed away from the nozzle cap to form a positioning groove, the contact surface of the nozzle cap and the nozzle is protruded towards the nozzle to form a positioning piece, and the positioning piece is suitable for being clamped in the positioning groove. The top face of the positioning piece abuts against the groove bottom face of the positioning groove. According to the hot runner nozzle assembly provided by the utility model, the positioning groove and the positioning piece are arranged at the contact part of the nozzle and the nozzle cap, so that high pressure, mechanical stress, impact force and the like generated in the injection molding process are more uniformly transferred and dispersed through the matching of the positioning piece and the positioning groove; compared with a traditional plane abutting structure, the local pressure of the contact face is reduced, so that deformation of the nozzle cap is effectively avoided, the sealing performance of the nozzle is guaranteed, the glue leakage phenomenon is prevented, and finally the product quality is improved, the production cost is reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nozzle assembly technical field, concretely relates to a hot runner nozzle assembly. BACKGROUND

[0002] In the injection molding process, the hot runner is the core heating assembly system of the injection mold. In the conventional hot runner heating system, the nozzle is usually embedded and installed, and the nozzle cap needs to be reversed. During the long-term injection molding process, the injection molding process will produce a complex pressure environment, such as the high pressure generated when the injection molding machine screw pushes the plastic melt, the mechanical stress during the opening and closing of the mold, and the impact force generated when the plastic melt flows through the nozzle. Due to the fact that the contact surface of the nozzle cap and the nozzle is generally a plane that abuts each other, and the contact surface of the nozzle cap and the nozzle is deformed under the combined action of long-term pressure, once the nozzle cap is deformed, the sealing performance of the nozzle will be damaged, which will eventually lead to the phenomenon of glue leakage, affecting the product quality, and possibly increasing the production cost and reducing the production efficiency. SUMMARY

[0003] Therefore, the utility model provides a hot runner nozzle assembly to solve the problem of deformation of the contact surface of the nozzle and the nozzle cap under pressure, leading to glue leakage.

[0004] The utility model provides a hot runner nozzle assembly, which comprises:

[0005] The nozzle and the nozzle cap, the contact surface of the nozzle and the nozzle cap is recessed to form a positioning groove in the direction away from the nozzle cap, the contact surface of the nozzle cap and the nozzle is convex to form a positioning piece in the direction towards the nozzle, the positioning piece is adapted to be connected in the positioning groove, and the top surface of the positioning piece and the groove bottom surface of the positioning groove are in abutment.

[0006] Optionally, the positioning piece is a stepped structure, and the positioning groove and the positioning piece are conformal.

[0007] Optionally, the top surface of the positioning piece is perpendicular to the side end surface thereof.

[0008] Optionally, at least two side surfaces of the positioning piece are in abutment with the groove wall surface of the positioning groove.

[0009] Optionally, when the positioning piece is connected in the positioning groove, the positioning piece is at least partially exposed to the positioning groove.

[0010] Optionally, the axial height of the positioning piece exposed to the positioning groove is 1mm.

[0011] Optionally, the side end surface of the positioning piece is chamfered at the connection with the top surface.

[0012] Optionally, a chamfer is arranged at the joint of the side groove wall of the positioning groove and the groove bottom surface.

[0013] Optionally, the positioning member and the positioning groove are annular structures, and are arranged around the flow channel of the nozzle.

[0014] Optionally, the nozzle and the nozzle cap are fixedly connected through a fastener arranged along the nozzle axial direction.

[0015] Advantages

[0016] The hot runner nozzle assembly provided by the utility model, comprising a nozzle and a nozzle cap, the contact surface of the nozzle and the nozzle cap is recessed to form a positioning groove in the direction away from the nozzle cap, the contact surface of the nozzle cap and the nozzle is convex to form a positioning member in the direction towards the nozzle, the positioning member is suitable for being clamped in the positioning groove, and the top surface of the positioning member abuts against the groove bottom surface of the positioning groove. The hot runner nozzle assembly sets the positioning groove and the positioning member at the contact position of the nozzle and the nozzle cap, so that the high pressure, mechanical stress and impact force generated in the injection molding process are more uniformly transmitted and dispersed through the cooperation of the positioning member and the positioning groove, the local pressure of the contact surface is reduced compared with the traditional plane abutting structure, the deformation of the nozzle cap is effectively avoided, the sealing performance of the nozzle is ensured, the glue leakage phenomenon is prevented, and finally the product quality is improved, the production cost is reduced, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0018] Figure 1 It is a sectional view of a hot runner nozzle assembly of the utility model embodiment.

[0019] Figure 2 It is a sectional view of a hot runner nozzle assembly of the utility model embodiment. Figure 1 It is a local enlarged view of A in the middle.

[0020] Figure 3 It is a sectional view of a hot runner nozzle assembly of the utility model embodiment.

[0021] Figure 4 It is a sectional view of a hot runner nozzle assembly of the utility model embodiment.

[0022] Figure 5 It is a sectional view of a hot runner nozzle assembly of the utility model embodiment.

[0023] Reference numerals:

[0024] 1. nozzle; 11, positioning groove; 12, flow channel; 2, nozzle cap; 21, positioning piece. DETAILED DESCRIPTION

[0025] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] The embodiments of the present application will be described below with reference to Figures 1 to 5 .

[0027] According to the embodiments of the present application, a hot runner nozzle assembly is provided, comprising:

[0028] The nozzle 1 and the nozzle cap 2, the contact surface of the nozzle 1 and the nozzle cap 2 is recessed to form a positioning groove 11 in the direction away from the nozzle cap 2, the contact surface of the nozzle cap 2 and the nozzle 1 is convex to form a positioning piece 21 in the direction towards the nozzle 1, the positioning piece 21 is adapted to be clamped in the positioning groove 11, and the top surface of the positioning piece 21 abuts against the groove bottom surface of the positioning groove 11.

[0029] The hot runner nozzle assembly provided in the embodiments reduces the local pressure of the contact surface compared with the traditional plane abutting structure, so that the high pressure, mechanical stress and impact force generated during the injection molding process are more uniformly transmitted and dispersed through the cooperation of the positioning piece 21 and the positioning groove 11, thereby effectively avoiding the deformation of the nozzle cap 2, further ensuring the sealing performance of the nozzle 1, preventing the glue leakage phenomenon from occurring, and ultimately improving the product quality, reducing the production cost, and improving the production efficiency.

[0030] Further, the positioning piece 21 is a stepped structure, and the positioning groove 11 and the positioning piece 21 are conformally matched.

[0031] As can be easily understood, the stepped positioning piece 21 cooperates with the positioning groove 11, and the stepped surface can receive high pressure, mechanical stress and impact force during injection molding, so that the pressure of the single contact surface is reduced by layered bearing to avoid deformation problems.

[0032] In an optional embodiment, the positioning member 21 can be a truncated conical frustum structure, and the positioning groove 11 is also conformal to the conical frustum positioning member 21. When the conical frustum positioning member 21 is matched with the positioning groove 11, the conical surface structure can play a self-centering role during assembly, thereby reducing the assembly difficulty, and can also adapt to forces in different directions. In another optional embodiment, a multi-prism positioning member 21 can also be used, and the multiple prism surfaces are tightly attached to the inner wall of the positioning groove 11, which can provide more stable circumferential positioning and reduce the shaking of the assembly during the injection molding process.

[0033] Further, the top surface of the positioning member 21 is perpendicular to the side end surface thereof.

[0034] As can be easily understood, the perpendicular arrangement of the top surface of the positioning member 21 and the side end surface thereof can achieve stable axial and circumferential positioning, enhance the stability of the assembly, prevent displacement or rotation, ensure the reliability of the seal, reduce the risk of glue leakage, protect product quality, and reduce production interruption and cost increase.

[0035] Further, at least two side surfaces of the positioning member 21 abut the groove wall surface of the positioning groove 11.

[0036] It should be noted that the abutment of the at least two side surfaces of the positioning member 21 and the groove wall surface of the positioning groove 11 is used to improve the positioning accuracy. During the injection molding process, the forces from different directions will have a tendency to deform the nozzle 1 and the nozzle cap 2 relatively, and the tight abutment of the side surface and the groove wall surface can effectively block such deformation, ensuring that the two are always in precise cooperation. From the perspective of assembly stability, the supporting effect of the side surface enhances the rigidity of the entire structure, so that the hot runner nozzle assembly can still remain stable under complex injection pressure environment, avoiding injection defects caused by shaking or deviation, thereby improving the product qualification rate and ensuring the continuity and efficiency of production.

[0037] Further, when the positioning member 21 is clamped in the positioning groove 11, the positioning member 21 is at least partially exposed to the positioning groove 11.

[0038] It should be noted that when the positioning member 21 is clamped in the positioning groove 11 and at least partially exposed to the positioning groove 11, in terms of heat dissipation, the exposed part can directly exchange heat with the surrounding environment, accelerating heat dissipation and avoiding the accumulation of high temperature generated during the injection molding process inside the assembly, affecting the material properties and sealing effect. From the perspective of maintenance convenience, the exposed positioning member 21 is convenient for operators to directly observe its state during inspection, and once problems such as wear and deformation are found, timely maintenance or replacement can be performed, reducing production delays caused by difficult troubleshooting.

[0039] Further, the axial height of the positioning member 21 exposed to the positioning groove 11 is 1 mm.

[0040] Need to explain, 1mm exposed height makes the operator without the help of any complex professional tools, only by simple visual and manual operation, can easily check the positioning piece 21 all-round, timely discovery such as wear, deformation and other potential problems, but also facilitate the daily cleaning work, reduce the difficulty and cost of maintenance, improve the continuity and efficiency of production.

[0041] Further, the side end surface of the positioning piece 21 is chamfered at the junction with the top surface.

[0042] Further, the side groove wall of the positioning groove 11 is chamfered at the junction with the groove bottom surface.

[0043] Need to explain, chamfering in terms of performance, can eliminate sharp corners, prevent plastic melt to produce turbulence, ensure product forming quality stability, and can play a guiding role when assembling, improve the assembly efficiency. In terms of structural strength, stress can be dispersed, material fatigue, cracking can be avoided, structural strength can be enhanced, the service life of the assembly can be prolonged, and the stability of injection molding production can be ensured.

[0044] Further, the positioning piece 21 and the positioning groove 11 are annular structures, and are arranged around the flow channel 12 of the nozzle 1.

[0045] Need to explain, from the stability of the flow channel 12, the annular structure can wrap the flow channel 12 all-round, provide uniform and stable support for it, effectively resist the pressure impact of the plastic melt during injection molding, ensure stability, and make the plastic melt always maintain a smooth flow state. In terms of sealing performance, the close fit of the annular structure greatly increases the sealing contact area, forms a more reliable sealing line, effectively prevents the leakage of plastic melt, ensures the normal progress of injection molding, reduces the production loss and product quality problems caused by glue leakage.

[0046] Further, the nozzle 1 and the nozzle cap 2 are fixedly connected by a fastener arranged along the axial direction of the nozzle 1.

[0047] Specifically, the fastener is a bolt. The bolt is a standard part, which can be easily installed and removed by means of a wrench, which can greatly shorten the time and effectively improve the efficiency in large-scale production and daily maintenance.

[0048] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A hot- runner nozzle assembly characterized by, The application relates to a nozzle (1) and a nozzle cap (2), wherein a contact surface of the nozzle (1) is recessed to form a positioning groove (11) in a direction away from the nozzle cap (2), a contact surface of the nozzle cap (2) is convex to form a positioning piece (21) in a direction towards the nozzle (1), the positioning piece (21) is adapted to be clamped in the positioning groove (11), and a top surface of the positioning piece (21) abuts against a groove bottom surface of the positioning groove (11). The positioning piece (21) is a stepped structure, and the positioning groove (11) is adapted to conform to the positioning piece (21).

2. The hot- runner nozzle assembly of claim 1, wherein The top surface of the positioning piece (21) is arranged perpendicularly to a side end surface thereof.

3. The hot- runner nozzle assembly of claim 2, wherein, At least two side surfaces of the positioning piece (21) abut against groove wall surfaces of the positioning groove (11).

4. The hot- runner nozzle assembly of any of claims 1-3, wherein, When the positioning piece (21) is clamped in the positioning groove (11), the positioning piece (21) is at least partially exposed from the positioning groove (11).

5. The hot- runner nozzle assembly of claim 4, wherein, An axial height of the positioning piece (21) exposed from the positioning groove (11) is 1 mm.

6. The hot-duct nozzle assembly of claim 5, wherein, A side end surface of the positioning piece (21) is chamfered at a connection with a top surface thereof.

7. The hot- runner nozzle assembly of any of claims 1-3, wherein, A side groove wall of the positioning groove (11) is chamfered at a connection with a groove bottom surface thereof.

8. The hot-duct nozzle assembly of claim 7, wherein, The positioning piece (21) and the positioning groove (11) are annular structures and are arranged around a flow channel (12) of the nozzle (1).

9. The hot- runner nozzle assembly of any of claims 1-3, wherein, The nozzle (1) and the nozzle cap (2) are fixedly connected through fasteners arranged in parallel to an axial direction of the nozzle (1).

10. The hot- runner nozzle assembly of any one of claims 1-3, wherein, ​

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