KR102399585B1 - Nozzle unit structure of hot runner system - Google Patents

Abstract

The present invention relates to a nozzle unit structure of a hot runner system. The nozzle unit structure of the hot runner system according to an embodiment of the present invention includes: a manifold unit including a manifold block having a flow path for distributing a molten resin injected from the outside is formed therein; a nozzle unit connected to the manifold block and including a nozzle body and a nozzle tip for discharging the molten resin flowing in from the flow path; and a cylinder unit configured on the upper portion of the manifold unit and including a cylinder in which a valve pin for discharging molten resin toward a product is installed so as to be able to move up and down. And the valve pin has a plurality of protrusions protruding at the bottom to form a multi-point sealing point between the product and the product, and is formed in communication with the nozzle flow path formed inside the nozzle body to flow the molten resin toward the nozzle tip. A plurality of passage holes are configured on the sidewall to form a multi-point gate sealing structure, thereby improving productivity and extending the life of the hot runner system itself through improved formability and quality of products.

Description

Nozzle unit structure of hot runner system {NOZZLE UNIT STRUCTURE OF HOT RUNNER SYSTEM}

The present invention relates to a hot runner system. More particularly, it relates to a nozzle unit structure of a hot runner system for mass-producing plastic products in the form of filling a cavity by injecting a molten resin into an injection mold.

The hot runner system refers to a device for injecting molten resin (hereinafter referred to as 'molten resin') into the cavity of the mold while maintaining the temperature of the molten resin at a high pressure and injecting it into the mold at high pressure. it is common to do

Such a hot runner system, for example, can be stably supplied to the injection mold side through several points in a molten state during injection molding, so that precision molding can be performed even when the temperature of the molten resin is low or the injection pressure is low.

On the other hand, in the hot runner system, a flow channel through which the molten resin flows is formed inside the manifold unit for uniformly supplying the molten resin to the cavity side of the mold through the flow path, and a nozzle for discharging the molten resin It includes a nozzle unit and a cylinder unit.

In addition to this, it may include a mold system unit (MODU System unit) and a connecting unit (Connecting Unit), etc. assembled together with the hot runner system to verify operation and heating of the heater.

Here, as described above, the hot runner system supplies the molten resin to the cavity side of the mold through the flow path formed inside the manifold unit, and the type and additive of the molten resin, such as glass fiber, mineral fiber ( According to the content of mineral fiber), it is necessary to variously configure the structures of the valve pin and the nozzle unit constituting the cylinder unit.

However, the hot runner system according to the prior art constitutes a nozzle unit structure that discharges the molten resin while the lower end of the valve pin ascends and descends at the outlet formed at the nozzle tip, so for example, in the circumferential direction such as a cap or a gear. When selecting a multi-gate, it is difficult to fill or seal the molten resin according to the shape of the product.

That is, it is difficult to select a sealing structure and a location suitable for the shape of the plastic product and the location of the gate, which acts as a factor that interferes with the smooth flow of the molten resin.

Therefore, there is a need for improvement of a hot runner system capable of variously configuring the structure of the valve pin and nozzle unit in consideration of the shape of the plastic product and the position of the gate.

Republic of Korea Patent Publication No. 10-2011-0072080

An object of the present invention is to improve the formability and quality of the product and improve the flowability of the molten resin by selecting a gate position suitable for product characteristics and applying a multi-point sealing structure by configuring the shape of the nozzle unit and the valve pin in various ways. It is to provide a nozzle unit structure of a hot runner system that can do this.

In order to achieve the above task,

The nozzle unit structure of the hot runner system according to an embodiment of the present invention is a manifold unit including a manifold block in which a flow channel for distributing a molten resin injected from the outside is formed. );

a nozzle unit connected to the manifold block and including a nozzle body and a nozzle tip for discharging the molten resin flowing in from the flow path; and

a cylinder unit configured on the upper portion of the manifold unit and including a cylinder having a valve pin discharging molten resin toward the product to be lifted and lowered;

includes,

The valve pin has a plurality of protrusions protruding at the bottom to form a multi-gate sealing point between the product and the product, and is formed in communication with the nozzle flow path formed inside the nozzle body to release the molten resin. A plurality of flow channel holes that flow toward the nozzle tip are configured on the side wall to form a multi-point gate sealing structure.

In addition, in the nozzle unit structure of the hot runner system according to an embodiment of the present invention, the nozzle body and the nozzle tip may be integrally formed.

In addition, in the nozzle unit structure of the hot runner system according to an embodiment of the present invention, the plurality of point protrusions are composed of 2 to 6 and various holes according to the shape of the gate, each having a cylindrical shape. there is.

In addition, in the nozzle unit structure of the hot runner system according to an embodiment of the present invention, the plurality of point protrusions may be arranged in a circumferential direction of the valve pin.

In addition, in the nozzle unit structure of the hot runner system according to an embodiment of the present invention, the plurality of flow holes may be configured in straight and oblique directions, respectively.

In addition, in the nozzle unit structure of the hot runner system according to an embodiment of the present invention, the valve pin is configured in the shape of a groove on the outer periphery of the side wall, a plurality of guides for guiding the molten resin to each flow path hole;

may further include.

In addition, in the nozzle unit structure of the hot runner system according to an embodiment of the present invention, the plurality of guide parts and the plurality of flow passage holes may be configured with 2 to 6 and various number of holes according to the shape of the gate.

These solutions will become more apparent from the detailed description for carrying out the following invention based on the accompanying drawings.

Prior to this, the terms or words used in the present specification and claims should not be construed in their ordinary and dictionary meanings, and the inventor may properly define the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it is possible.

According to one embodiment of the present invention, by configuring the shape of the nozzle unit and the valve pin in various ways to select a gate location suitable for product characteristics and apply a multi-point gate sealing structure, productivity is improved through improvement of formability and quality of products Not only can it be done, but it also has the effect of extending the lifespan of the hot runner system itself.

In addition, according to an embodiment of the present invention, by improving the ability to fill the molten resin in multiple directions, the flowability of the molten resin is improved during injection according to the type and additive content of the molten resin, which may occur when the molten resin is filled. It is possible to effectively prevent the occurrence of possible gate troubles.

In addition, according to an embodiment of the present invention, it is possible to not only improve the malfunction of the valve pin due to the solidification of the molten resin through improvement of the flowability of the molten resin, but also to effectively disperse the internal pressure and pressure that may occur in the molten resin. can Therefore, there is an effect of extending the life of the hot runner system.

1 is a cross-sectional view showing a hot runner system as a whole according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the nozzle unit of the hot runner system according to FIG. 1 as a whole;
3 to 11 are perspective views showing enlarged main parts of a nozzle unit of a hot runner system according to an embodiment of the present invention.
12 to 13 are cross-sectional views showing the flow state of the molten resin through the nozzle unit structure of the hot runner system according to the second embodiment of the present invention.
14 to 16 are diagrams of various usage states to which the nozzle unit of the hot runner system of the present invention is applied.

The specific aspects and specific technical features of the present invention will become more apparent from the following detailed description and embodiments in conjunction with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When a component is described as being “connected”, “coupled” or “connected” to another component, the component may be directly connected to or connected to the other component, but another component is between each component. It should be understood that elements may be “connected,” “coupled,” or “connected.”

Before describing an embodiment of the present invention in detail, the hot runner system will be comprehensively described as follows.

For example, the hot runner system is connected to an external injection machine nozzle through a sprue bush, so that molten resin is injected from the outside, and a manifold for distributing it through a flow channel, which is a kind of passage through which the molten resin flows. Includes a Manifold Unit.

The manifold unit includes a manifold block in which a flow path for distributing the molten resin injected from the outside is formed. In addition, the manifold unit may further include a nozzle locator in which an outlet communicating with a flow path is formed at a lower portion and an inlet communicating with the outlet is formed at an upper portion to supply the molten resin to the flow path of the manifold block.

On the other hand, the nozzle unit (Nozzle Unit) of the hot runner system according to an embodiment of the present invention is connected to the manifold unit and the molten resin flowing from the flow path is a plastic product including a cap (Cap), gear (Gear), etc. (hereinafter referred to as 'product') By discharging the molten resin to the side, injection-molded products can be mass-produced.

To this end, the nozzle unit may include a nozzle body having a nozzle passage provided therein, and a nozzle tip configured at a lower end of the nozzle body to discharge molten resin. In addition, a heater constituting a heat diffusion structure may be installed on the outside.

This nozzle unit is formed in a cylindrical shape to accommodate a valve pin ascending and descending along the cylinder of the cylinder unit configured on the upper part of the manifold unit, and the nozzle flow path provided on the inside is the manifold block By communicating with the flow path of the molten resin injected from the flow path flows to the nozzle tip.

Therefore, the molten resin injected through the injection machine nozzle is supplied to the manifold block through the nozzle locator, transferred to the nozzle unit while flowing along the flow path of the manifold block, and then discharged to the product side through the elevation of the valve pin. product can be mass-produced.

Hereinafter, an embodiment of the present invention will be described in detail based on the accompanying drawings.

As shown in FIGS. 1 to 16 , the nozzle unit structure of the hot runner system according to an embodiment of the present invention is to select a multi-gate in the circumferential direction of the product (4) of the product (4). A valve in which a plurality of protrusions 32 are configured at the bottom to configure a multi-gate sealing point according to the shape, and a plurality of flow passage holes 33 communicating with the nozzle passage 22 are formed on the side wall. It includes a pin (31).

For example, the valve pin 31 has an upper portion fixed inside the cylinder 30 constituting the cylinder unit 3 to elevate, and may be formed in a T-shaped cylinder shape, but is not necessarily limited thereto. revealed in

That is, the valve pin 31 moves the molten resin to the nozzle tip while ascending and descending by the fluid flowing into the cylinder 30 . However, the matters related to the lifting and lowering of the valve pin 31 are well-known techniques in the art, and since they can be easily implemented without a more specific description, the following will be omitted in advance.

The nozzle body 20 accommodating the valve pin 31 therein is connected to the manifold block 10 constituting the manifold unit 1 to form a flow path 11 formed inside the manifold block 10 . The nozzle flow path 22 receiving the molten resin from is formed inside, and the nozzle tip 21 for discharging the molten resin is configured at the bottom. In addition, the nozzle body 20 and the nozzle tip 21 may be integrally configured, which is illustrated and shown (see FIG. 2 ).

Here, a plurality of protrusions 32 are formed at the lower end of the valve pin 31 disposed on the nozzle tip 21 side, and between the product 4 including a cap, a gear, etc. It constitutes a multi-point gate sealing structure, which is illustrated and shown (refer to FIGS. 3 to 8 ).

For example, two to six protrusions 32 are formed at the lower end of the valve pin 31 and the number of various holes to match the gate shape, so that when the valve pin 31 is lowered, it is a multi-point gate between the product 4 and the product 4 . It constitutes a sealing point (see Fig. 12.)

In addition, depending on the shape of the product 4, two protrusions 32 may be configured at the lower end of the valve pin 31 (see FIGS. 9 and 10), and three protrusions 32 may be configured ( 11), which is illustrated and shown, up to six may be configured according to the size of the valve pin 31 .

The plurality of protrusions 32 may each be formed in a cylindrical shape and may be arranged regularly or irregularly along the circumferential direction at the lower end of the valve pin 31 .

Therefore, according to an embodiment of the present invention, by selecting a gate position suitable for the characteristics (caps or gears) of the product 4 through the plurality of protrusions 32 and configuring a multi-point gate sealing structure, the molding of the product 4 is performed. It can improve performance and improve quality.

On the other hand, in the valve pin 31 according to an embodiment of the present invention, a plurality of flow passage holes 33 are formed through, for example, an oblique direction in a side wall that faces the nozzle passage 22, so that the nozzle passage 22 ) to flow the molten resin flowing along the nozzle tip 21 (see FIG. 13).

Like the plurality of protrusions 32 , the plurality of passage holes 33 may be configured with 2 to 6 and various numbers of holes according to the shape of the gate. That is, two flow passage holes 33 may be formed in the sidewall of the valve pin 31 (see FIG. 5 ), three flow passage holes 33 may be formed (see FIG. 6 ), and a maximum of six flow passage holes (33) may be formed (see FIGS. 7 and 10).

Here, a plurality of guide portions 34 may be formed in the shape of a groove on the sidewall of the valve pin 31 in which the passage hole 33 is formed to guide the molten resin to each passage hole 33 ( 9 to 11).

The plurality of guide portions 34 may be configured in a number of 2 to 6 corresponding to the plurality of passage holes 33 and various holes according to the shape of the gate, which is illustrated and shown. And each guide part 34 is disposed to correspond to each of the flow path holes 33 so that the molten resin flowing along the nozzle flow path 22 can flow toward the nozzle tip 21 when the valve pin 31 is lifted. There is (see Fig. 13).

On the other hand, the valve pin 31 inserted through the nozzle body 20 is provided in various sizes to correspond to the nozzle flow path 22 formed in the nozzle body 20, and the point protrusion ( 32), the flow hole 33 and the guide part 34 may be applied in various shapes (refer to FIGS. 14 to 16).

Here, in the case of the valve pin 31, the material of the body and the tip can be applied as a double material, and in the case of the body, it is applied as a steel series, and in the case of the tip, it is applied as a copper series to provide temperature compensation at the tip according to the thermal conductivity. Also, since the body and the tip are separably made of different materials so that only the tip of the worn valve pin 31 can be replaced, management and cost associated with maintenance can be reduced (see FIG. 14 ).

On the other hand, by configuring only the nozzle tip 21, not the tip of the valve pin 31, to the valve pin 31 in a fastening method, it is possible to reduce maintenance costs by replacing only the nozzle tip 21 during maintenance due to wear. There is, the material of the valve pin 31 is applied as a steel series, and the material of the nozzle tip 21 is applied in the same series to apply the same series material to the tip of the valve pin 31, which is advantageous for temperature compensation (Fig. 15).

Finally, the nozzle tip 21, which covers the tip of the valve pin 31 and through which the nozzle tip 21 passes, is configured to be fastened to the nozzle body 20, so that the resin retention space at the tip of the valve pin 31 It is possible to minimize the influence of the resin mold part by removing the , and if the nozzle tip 21 is provided with a material of the same series, it is effective for temperature compensation (see FIG. 16 ).

Therefore, by providing the present invention configured as described above, by improving to be able to fill the molten resin in multiple directions through the plurality of passage holes 33 and the plurality of guide portions 34, the type and additive content of the molten resin By improving the flowability of the molten resin during injection according to 31), it is possible to effectively disperse the internal pressure and pressure that may occur in the molten resin.

Although the present invention has been described in detail through one embodiment, this is for describing the present invention in detail, and the nozzle unit structure of the hot runner system according to the present invention is not limited thereto. And, terms such as "include", "compose", or "have" described above mean that the corresponding component may be embedded unless otherwise stated, so excluding other components is It should be construed as being able to further include other components instead of it, and all terms including technical or scientific terms are generally understood by those of ordinary skill in the art to which the present invention belongs, unless otherwise defined. has the same meaning as being

In addition, the above description is merely illustrative of the technical idea of the present invention, and various modifications and variations are possible for those of ordinary skill in the art to which the present invention pertains without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1: Manifold unit 2: Nozzle unit
3: Cylinder unit 4: Product
10: Manifold block 11: Euro
20: nozzle body 21: nozzle tip
22: nozzle flow path 30: cylinder
31: valve pin 32: point protrusion
33: Euro Hall 34: Information Department

Claims (7)

a manifold unit 1 including a manifold block 10 having a flow path 11 for distributing the molten resin injected from the outside is formed therein;
a nozzle unit (2) connected to the manifold block (10) and including a nozzle body (20) and a nozzle tip (21) for discharging the molten resin flowing in from the flow path (11);
It is configured on the upper part of the manifold unit (1) and includes a cylinder unit (3) including a cylinder (30) in which a valve pin (31) for discharging molten resin toward the product (4) is installed so as to be able to move up and down,
The valve pin 31 is,
a plurality of point protrusions 32 protruding from the bottom to form a multi-point gate sealing point between the product 4 and the product;
A plurality of passage holes 33 formed integrally in communication with the nozzle passage 22 formed on the inside of the nozzle body 20 to flow the molten resin toward the nozzle tip 21 are provided on the sidewall of the nozzle body 20 in a diagonal direction to form a multi-point gate sealing structure. constitute,
A plurality of guide portions 34 configured in the shape of a groove on the outer periphery of the side wall to guide the molten resin to each flow hole 33; is further formed,
The plurality of guide portions 34 and the plurality of passage holes 33 are composed of 2 to 6 and various number of holes according to the shape of the gate,
The plurality of point protrusions 32 are each in a cylindrical shape with 2 to 6 and various number of holes to match the gate shape, and the plurality of point protrusions 32 are arranged along the circumferential direction of the valve pin 31. The nozzle unit structure of the hot runner system with delete delete delete delete delete delete

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