Geometrically balanced co-injection hot runner nozzle

Abstract

The present invention belongs to the technical field of injection molding nozzles, specifically a geometrically balanced co-injection hot runner nozzle, comprising: a base assembly, an inner distributor fluid clamped in the base assembly, an outer distributor fluid sleeved on the inner distributor fluid, and a shell assembly sleeved on the outer distributor fluid and connected to the base assembly; wherein the base assembly comprises a seat body, a connecting groove provided in the seat body, and a guide groove 1 provided in the connecting groove. The present invention realizes the geometric balance of each layer of flow channel: the main material flow enters from the feed port 1 and is divided into an inner layer and an outer layer, the inner layer advances along the periphery of the valve needle, the outer layer advances along the circular flow channel, and the secondary material flow enters from the feed port 2 to form an intermediate layer. The flow channels of each layer are ensured to advance synchronously at the front end of the material flow by reducing the flow area under certain compression, and in the rear section of the flow channel, the material flow is kneaded by a continuously compressed kneading chamber to ensure the concentricity and flatness of each layer of material flow.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding nozzles, in particular to a geometrically balanced co-injection hot runner nozzle. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes of thermoplastics or thermosetting plastics. It is divided into vertical, horizontal and all-electric types. The injection molding machine can heat the plastic and apply high pressure to the molten plastic so that it is ejected through the hot runner nozzle and fills the mold cavity.

[0003] The hot runner nozzles used in injection molding machines mainly use single-point hot runners and multi-point hot runners to eject molten plastic. Among them, the single-point hot runner uses a single nozzle to directly inject the molten material into the cavity, or the melt enters the ordinary runner from the hot nozzle first, and then enters the cavity. The multi-point hot runner uses the hot runner plate to divert the molten plastic to each nozzle, and then enters the cavity or the ordinary runner. However, the multi-point hot runner uses multiple nozzles in the multi-layer co-injection, and the front end of each layer of material flow often becomes uneven and the thickness is uneven. At the same time, weld lines will appear in each layer of material flow during co-injection, affecting the molding quality of the product. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0005] To this end, the technical solution adopted in the present invention is:

[0006] The geometrically balanced co-injection hot runner nozzle comprises: a base assembly, an inner distributor mounted in the base assembly, an outer distributor mounted on the inner distributor, and a shell assembly mounted on the outer distributor and connected to the base assembly; wherein, the base assembly comprises a seat body, a connecting groove provided in the seat body, a guide groove 1 provided in the connecting groove, a feed port 1 provided in the middle of the seat body and communicating with the connecting groove, a shell connected to the seat body, a valve needle inserted in the feed port 1, and a feed port 2 provided at the bottom of the seat body and located outside the feed port 1; the inner distributor comprises a fixed disk 1 mounted in the shell, a diverter column fixed in the middle of the fixed disk 1, a guide column 1 connected to the diverter column, a connecting plate provided at the bottom of the fixed disk 1, and a valve needle inserted in the feed port 1. A connecting block, a second guide groove opened at the bottom of the connecting block and corresponding to the first guide groove, an inner hole opened on the fixed disk and located on the side of the diverter column, an outer hole opened on the fixed disk and staggered on the outside of the inner hole, a diverter hole one opened on the diverter column, a concave-convex groove one opened on the diverter column and a discharge hole one opened on the top of the diverter column; the external diverter includes a fixed disk two clamped on the fixed disk one, a guide column two fixed to the middle of the fixed disk two, a diverter hole two opened on the fixed disk two and corresponding to the first diverter hole, a concave-convex groove two opened on the guide column two and a discharge hole two opened at the top of the guide column two; the outer shell component includes an assembly shell threadedly connected to the shell and a discharge hole three opened on the assembly shell.

[0007] In a preferred example, the present invention can be further configured as follows: the connecting groove and the fixing plate are adapted to each other in a conical structure.

[0008] In a preferred example, the present invention can be further configured as follows: the guide groove 1 and the guide groove 2 are respectively four groups of semicircular groove structures, forming a circular flow channel.

[0009] In a preferred example, the present invention can be further configured as follows: kneading cavities are respectively formed between the guide column 1 and the guide column 2, and between the guide column 2 and the assembly shell.

[0010] In a preferred example, the present invention can be further configured as follows: the discharge hole 1 is a trumpet-shaped structure opening toward the feed port 2, and the outer diameter of the feed port 2 is between the inner diameters of the two ports of the discharge hole 1.

[0011] In a preferred example, the present invention can be further configured as follows: there are four groups of outer holes, eight groups of diversion holes 1, and the feed port 1, circular flow channel, outer holes, diversion holes 2, guide column 2 and assembly shell are interconnected.

[0012] In a preferred example, the present invention can be further configured as follows: the feed port 2 and the inner hole are provided with four corresponding groups, and the feed port 2, the inner hole, the diversion hole 1 and the guide column 1 and the guide column 2 are connected.

[0013] In a preferred example, the present invention can be further configured as follows: the total flow area of ​​the inner hole is greater than the total flow area of ​​the diverter hole 1, and the intersection of the inner hole and the diverter hole 1 adopts a streamlined structure.

[0014] In a preferred example, the present invention can be further configured as follows: the flow area of ​​the kneading chamber gradually decreases in three directions from the feed inlet to the discharge hole.

[0015] The above technical solution of the present invention has the following beneficial technical effects:

[0016] 1. The present invention achieves geometric balance in each layer of flow channels: the main material flow enters from the first feed port and is divided into an inner layer and an outer layer. The inner layer advances along the periphery of the valve needle, and the outer layer advances along the circular flow channel. The secondary material flow enters from the second feed port to form an intermediate layer. The flow channels of each layer are reduced in flow area. Under certain compression conditions, the front ends of the material flows are ensured to advance synchronously. In the rear section of the flow channel, the material flow is kneaded by a continuously compressed kneading chamber to ensure the concentricity and smoothness of the material flows of each layer.

[0017] 2. The intersection of the inner hole and the diversion hole 1 of the present invention adopts streamlined treatment, which can make the material flow smooth and reduce melt fracture. The two sets of kneading cavities can further smooth the material flow, eliminate weld lines, and improve product molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An exploded view of a geometrically balanced co-injection hot runner nozzle structure according to an embodiment of the present invention;

[0019] Figure 2 A cross-sectional view of the inner and outer runners of a geometrically balanced co-injection hot runner nozzle according to an embodiment of the present invention;

[0020] Figure 3 A cross-sectional view of a middle-layer flow channel of a geometrically balanced co-injection hot runner nozzle according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the internal flow structure of an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the external flow structure of an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of a structure of a discharge hole according to an embodiment of the present invention;

[0024] Figure 7 For the present invention Figure 2 Middle AA section;

[0025] Figure 8 For the present invention Figure 2 Middle BB cross-section;

[0026] Figure 9 For the present invention Figure 4 Orthographic projection display diagram;

[0027] Figure 10 For the present invention Figure 5 Orthographic projection display diagram.

[0028] Reference numerals:

[0029] 100, base assembly; 110, seat body; 120, connecting groove; 130, guide groove 1; 140, feed port 1; 150, housing; 160, valve needle; 170, feed port 2;

[0030] 200, inner diverter; 210, fixed plate 1; 220, diverter column; 230, guide column 1; 240, connecting block; 250, guide groove 2; 260, inner hole; 270, outer hole; 280, diverter hole 1; 290, concave-convex groove 1; 231, discharge hole 1;

[0031] 300, external diverter; 310, fixed disk 2; 320, guide column 2; 330, diverter hole 2; 340, concave-convex groove 2; 350, discharge hole 2;

[0032] 400, outer shell assembly; 410, assembly shell; 420, discharge hole three; 430, kneading chamber. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features therein can be combined with each other without conflict.

[0034] It is to be understood that these descriptions are illustrative only and are not intended to limit the scope of the invention.

[0035] The following describes the geometrically balanced co-injection hot runner nozzles provided by some embodiments of the present invention in conjunction with the accompanying drawings. Example

[0036] Combine Figure 1-10As shown, the geometrically balanced co-injection hot runner nozzle provided by the present invention includes: a base assembly 100, an internal distributor fluid 200 clamped in the base assembly 100, an external distributor fluid 300 mounted on the internal distributor fluid 200, and a shell assembly 400 mounted on the external distributor fluid 300 and connected to the base assembly 100.

[0037] The present invention is used for a co-injection mold and is a nozzle of a hot runner system. The key to co-injection is to form a concentric circle between the layers and to make the material flow at the front end of each layer smooth.

[0038] Among them, the base assembly 100 includes a seat body 110, a connecting groove 120 opened in the seat body 110, a guide groove 130 opened in the connecting groove 120, a feed port 140 opened in the middle of the seat body 110 and connected to the connecting groove 120, a shell 150 connected to the seat body 110, a valve needle 160 inserted in the feed port 140, and a feed port 2 170 opened at the bottom of the seat body 110 and located outside the feed port 1 140.

[0039] Specifically, the connecting groove 120 and the fixing plate 1 210 are adapted conical structures, allowing the connecting block 240 to enter and complete the connection. Furthermore, the guide groove 1 130 and the guide groove 2 250 are respectively four groups of semicircular groove structures to form a circular flow channel.

[0040] On the other hand, the feed port 2 170 and the inner hole 260 are provided with four corresponding groups, and the feed port 2 170, the inner hole 260, the diversion hole 1 280 and the guide column 1 230 and the guide column 2 320 are connected to facilitate the circulation of the injection material.

[0041] Among them, the internal diverter fluid 200 includes a fixed disk 210 mounted in the shell 150, a diverter column 220 fixed in the middle of the fixed disk 210, a guide column 230 connected to the diverter column 220, a connecting block 240 arranged at the bottom of the fixed disk 210, a guide groove 250 opened at the bottom of the connecting block 240 and corresponding to the guide groove 130, an inner hole 260 opened on the fixed disk 210 and located on the side of the diverter column 220, an outer hole 270 opened on the fixed disk 210 and staggered outside the inner hole 260, a diverter hole 280 opened on the diverter column 220, a concave-convex groove 290 opened on the guide column 230 and a discharge hole 231 opened at the top of the guide column 230.

[0042] Specifically, kneading cavities 430 are formed between the first guide post 230 and the second guide post 320 as well as between the second guide post 320 and the assembly shell 410. The kneading cavities 430 can further smooth the material flow, eliminate weld lines, and improve product molding quality.

[0043] Furthermore, the discharge hole 1 231 is a trumpet-shaped structure opening toward the feed port 2 170 , and the outer diameter of the feed port 2 170 is between the inner diameters of the two ends of the discharge hole 1 231 . The thickness of each layer can be changed by adjusting the size of the discharge hole 1 231 .

[0044] Furthermore, the outer holes 270 are provided with four groups, the diversion holes 280 are provided with eight groups, and the feed port 1 140, the circular flow channel, the outer holes 270, the guide column 2 320 and the assembly shell 410 are interconnected. The middle layer and the outer layer both have four holes that are offset by 22.5 degrees to become eight holes, which can ensure the balance of material flow.

[0045] On the other hand, the total flow area of ​​the inner hole 260 is larger than the total flow area of ​​the diverter hole 280, so that the material flow is compressed to a certain extent, which can ensure a smooth material flow and a stable layer thickness. In addition, the junction of the inner hole 260 and the diverter hole 280 adopts a streamlined structure, which can make the material flow smooth and reduce melt fracture.

[0046] Among them, the external diversion flow 300 includes a fixed disk 2 310 clamped on the fixed disk 1 210, a guide column 2 320 fixed in the middle of the fixed disk 2 310, a diversion hole 2 330 opened on the fixed disk 2 310 and corresponding to the diversion hole 1 280, a concave-convex groove 2 340 opened on the guide column 2 320 and a discharge hole 2 350 opened at the top of the guide column 2 320. The diversion holes 2 330 are provided in eight groups, and two groups of diversion holes 2 330 correspond to one group of external holes 270.

[0047] Specifically, the outer dividing fluid 300 and the inner dividing fluid 200 have similar structures and the same functions, and form an intermediate layer for material discharge by limiting.

[0048] It should be noted that the three layers of flow channels are balanced from a geometrical point of view, ensuring that the front end of each layer of material flow is smooth without generating wavy shapes.

[0049] The housing assembly 400 includes an assembly shell 410 threadedly connected to the housing 150 and a discharge hole 420 opened on the assembly shell 410 .

[0050] Specifically, the flow area of ​​the kneading cavity 430 gradually decreases from the feed port 140 to the discharge port 3 420, so that the material flow can be compressed to a certain extent, thereby ensuring a smooth material flow and a stable layer thickness.

[0051] It should be noted that the above four holes and eight holes are only examples of the present invention, and other numbers of holes may also be used. Example

[0052] On the basis of the first embodiment, the kneading cavity 430 may adopt a circular thread groove, which also has a good kneading effect.

[0053] The working principle and usage process of the present invention are as follows: first, the main material flow enters from the feed port 140 and is divided into an inner layer and an outer layer. The inner layer moves along the periphery of the valve needle 160, and the outer layer enters the kneading cavity 430 between the guide column 2 320 and the assembly shell 410 along the circular flow channel and the outer hole 270. At the same time, the secondary material flow enters from the feed port 2 170, passes through the inner hole 260 and the diversion hole 1 280, and enters the kneading cavity 430 between the guide column 1 230 and the guide column 2 320 to form an intermediate layer, and then converges to the discharge hole 1 231 and the discharge hole 2 350 respectively, and finally is ejected through the discharge hole 3 420.

[0054] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. Geometrically balanced co-injection hot runner nozzle, characterized by: include: A base assembly (100), an inner distributor (200) mounted in the base assembly (100), an outer distributor (300) mounted on the inner distributor (200), and a housing assembly (400) mounted on the outer distributor (300) and connected to the base assembly (100); wherein: The base assembly (100) comprises a base body (110), a connecting groove (120) provided in the base body (110), a guide groove 1 (130) provided in the connecting groove (120), a feed port 1 (140) provided in the middle of the base body (110) and communicating with the connecting groove (120), a shell (150) connected to the base body (110), a valve needle (160) inserted in the feed port 1 (140), and a feed port 2 (170) provided at the bottom of the base body (110) and located outside the feed port 1 (140); The inner flow divider (200) comprises a fixed disk (210) mounted inside the housing (150), a flow divider column (220) fixed to the middle of the fixed disk (210), a flow guide column (230) connected to the flow guide column (220), a connection block (240) disposed at the bottom of the fixed disk (210), a flow guide groove (250) opened at the bottom of the connection block (240) and corresponding to the flow guide groove (130), An inner hole (260) opened on the fixed disk (210) and located on the side of the diverter column (220), an outer hole (270) opened on the fixed disk (210) and staggeredly arranged outside the inner hole (260), a diverter hole (280) opened on the diverter column (220), a concave-convex groove (290) opened on the guide column (230), and a discharge hole (231) opened on the top of the guide column (230); The connecting groove (120) and the fixing plate 1 (210) are compatible conical structures, and the guide groove 1 (130) and the guide groove 2 (250) are respectively four groups of semicircular groove structures to form a circular flow channel; The second feed port (170) and the inner hole (260) are provided with four corresponding groups, and the second feed port (170), the inner hole (260), the first flow diversion hole (280) and the first flow guide column (230) and the second flow guide column (320) are interconnected; The total flow area of ​​the inner hole (260) is greater than the total flow area of ​​the first diverter hole (280), and the intersection of the inner hole (260) and the first diverter hole (280) adopts a streamlined structure; The external flow divider (300) comprises a second fixed disk (310) mounted on the first fixed disk (210), a second flow guide column (320) fixed at the middle of the second fixed disk (310), a second flow diversion hole (330) provided on the second fixed disk (310) and corresponding to the first flow diversion hole (280), a second concave-convex groove (340) provided on the second flow guide column (320), and a second discharge hole (350) provided at the top of the second flow guide column (320); The housing assembly (400) comprises an assembly shell (410) threadedly connected to the housing (150) and a third discharge hole (420) opened on the assembly shell (410); Wherein, a kneading cavity (430) is formed between the guide column 1 (230) and the guide column 2 (320), and between the guide column 2 (320) and the assembly shell (410); The outer holes (270) are provided in four groups, the flow diversion holes (280) are provided in eight groups, and the feed port (140), the circular flow channel, the outer holes (270), the flow diversion holes (330), the flow guide column (320) and the assembly shell (410) are interconnected.

2. The geometrically balanced co-injection hot runner nozzle according to claim 1, characterized in that: The discharge hole 1 (231) is a trumpet-shaped structure opening toward the feed port 2 (170), and the outer diameter value of the feed port 2 (170) is located between the inner diameter values ​​of the two ports of the discharge hole 1 (231).

3. The geometrically balanced co-injection hot runner nozzle according to claim 1, characterized in that: The flow area of ​​the kneading cavity (430) gradually decreases from the first feed port (140) to the third discharge port (420).

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