KR102260411B1 - Hot runner system with gas vent structure - Google Patents

Abstract

The present invention relates to a hot runner system using a gas discharge structure is applied. The hot runner system using a gas discharge structure according to an embodiment of the present invention is constituted to mass-produce injection-molded products through molten resin, wherein a gas discharge structure is applied to a pin guide bush and a pin guide ring for guiding the lift operation of a valve pin constituting a cylinder unit, a vent hole is formed to prevent malfunction of the valve pin in advance as the gas discharge structure, so that maintenance of the hot runner system is easy to extend its lifespan, and thus productivity can be improved.

Description

HOT RUNNER SYSTEM WITH GAS VENT STRUCTURE

The present invention relates to a hot runner system. More particularly, it relates to 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.

For example, a hot runner system is a device for injecting a 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 temperature and injecting it into the mold at high pressure It is common to refer to

That is, such a hot runner system has the advantage of enabling precise molding even when the temperature of the molten resin is low or the injection pressure is low because the molten resin can be stably supplied to the injection mold through several points in a molten state during injection molding.

On the other hand, in the hot runner system, a flow channel through which molten resin flows is formed inside, and a manifold unit that uniformly supplies molten resin to the cavity side of the mold through the flow channel, the manifold unit It includes a nozzle unit configured to discharge the molten resin to the mold side and a cylinder unit configured to the upper part of the manifold unit.

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

Here, the hot runner system includes a pin guide bush (PGB) and a pin guide ring for guiding the lifting and lowering of the valve pins constituting the cylinder unit, and is usually a manifold. It is configured in a manifold block.

That is, by seating the pin guide bush (PGB) on the manifold block and forming a shape in which the pin guide ring is pressed and supported, the lift drive of the valve pin is guided through the pin guide bush while leakage of molten resin (Leak) ) is prevented. And this is specifically disclosed in (Patent Document 1) (hereinafter referred to as 'prior art').

However, in the pin guide bush (P.G.B) and the pin guide ring according to the prior art, there is a deposition phenomenon in which foreign substances are accumulated by gas generated from the molten resin during injection.

More specifically, gas may be generated in the molten resin during injection depending on the type of the molten resin and the content of additives including glass fibers and mineral fibers. And, this gas along with the molten resin is introduced into the pin guide bush (P.G.B) and the pin guide ring through a fine gap between the sliding part of the valve pin and the pin guide bush (P.G.B).

Therefore, in the pin guide bush (PGB) and pin guide ring according to the prior art, there is a phenomenon of deposition of foreign substances including dust and erosion caused by this phenomenon, which causes malfunction of the valve pin due to the solidification of the molten resin inside. leading to results.

In addition, this problem not only acts as a factor that deforms and breaks the valve pin, but also shortens the life of the hot runner system and may impair productivity.

Republic of Korea Patent Publication No. 10-2012-0100526

An object of the present invention is to apply a gas evacuation structure to the outside of the pin guide bush and the pin guide ring to remove gases and foreign substances generated from the molten resin during injection in configuring a hot runner system for mass-producing injection-molded products through molten resin. An object of the present invention is to provide a hot runner system to which a gas evacuation structure is applied so that factors that cause malfunction of valve pins can be easily removed by discharging to the furnace.

Another object of the present invention is to provide a hot runner system to which a degassing structure is applied to prevent the molten resin discharged to the outside of the pin guide bush and the pin guide ring from flowing into the cylinder unit through the degassing structure. .

In order to achieve the above task,

The hot runner system to which the gas extraction structure is applied according to an embodiment of the present invention is a manifold unit including a manifold block having a flow channel formed therein through which a molten resin injected from the outside flows. Unit) is configured in the nozzle unit (Nozzle Unit) to supply the molten resin to the cylinder unit (Cylinder unit) pin guide bush (Pin Guide Bush: PGB) for guiding the elevation of the valve pin (Valve Pin); and

a pin guide ring configured while forming a junction (wetted portion) between the pin guide bush and the pin guide bush;

includes,

The pin guide bush and the pin guide ring may include: a vent hole configured to communicate with each other so as to discharge gas leaking between the sliding part of the valve pin and the pin guide bush to the outside;

may include.

In addition, in the hot runner system to which the degassing structure is applied according to an embodiment of the present invention, the shape of the vent hole may be a circle, an ellipse, a polygon, or a slot type.

In addition, in the hot runner system to which the degassing structure is applied according to an embodiment of the present invention, the shape of the vent hole may be a straight line, an oblique line, or a refractive type.

In addition, in the hot runner system to which the degassing structure is applied according to an embodiment of the present invention, the direction of the vent hole may be formed in a straight line, a cross shape, or a radial shape.

In addition, in the hot runner system to which the degassing structure is applied according to an embodiment of the present invention, the pin guide ring having the slotted vent hole is configured with a reinforcing unit to reinforce the stiffness lost due to the configuration of the slotted vent hole. can be

In addition, in the hot runner system to which the degassing structure is applied according to an embodiment of the present invention, the molten resin configured on the upper portion of the pin guide bush and the pin guide ring and discharged to the outside through the vent hole is introduced into the cylinder unit. a pad for preventing leakage;

may further include.

In addition, in the hot runner system to which the degassing structure is applied according to an embodiment of the present invention, the leak prevention pad has a center hole formed so that the valve pin is raised and lowered, and the center hole is spaced apart from the valve pin. It can be formed in any size that can exist.

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 an embodiment of the present invention, by applying a gas release structure to the pin guide bush and the pin guide ring, malfunction of the valve pin can be prevented in advance, so that maintenance of the hot runner system is easy and its lifespan can be extended. and, through this, productivity can be improved.

In addition, according to an embodiment of the present invention, it is possible to prevent the molten resin discharged to the outside of the pin guide bush and the pin guide ring through the degassing structure from flowing into the cylinder unit, thereby effectively improving the reliability of the degassing structure. can

1 is a perspective view showing a hot runner system to which a gas extraction structure according to an embodiment of the present invention is applied;
2 to 3 are cross-sectional views showing a hot runner system to which a gas extraction structure according to an embodiment of the present invention is applied.
4 is an exploded perspective view illustrating a pin guide bush and a pin guide ring of a hot runner system to which a gas release structure is applied according to an embodiment of the present invention;
Figure 5 is a perspective view showing a cross-section of the pin guide ring according to Figure 4;
6 is an exploded perspective view illustrating a pin guide bush and a pin guide ring of a hot runner system to which a gas release structure is applied according to an embodiment of the present invention;
7 is a perspective view showing a cross-section after coupling the pin guide bush and the pin guide ring according to FIG. 6;
8 is an enlarged cross-sectional view of a hot runner system to which a gas extraction structure is applied according to an embodiment of the present invention;

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 though 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 or connected to the other component, but another component may be formed between each component. It should be understood that elements may be “connected,” “coupled,” or “connected.”

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

1 to 3, the hot runner system (hereinafter referred to as a 'hot runner system') to which the gas extraction structure according to an embodiment of the present invention is applied is, for example, an external injection machine nozzle and a sprue bush. By being connected through, the molten resin (Resin) is injected from the outside, and includes a manifold unit 4 for distributing it through the flow path 21, which is a kind of passage through which the molten resin flows.

The manifold unit 4 includes a nozzle locator 11 configured to communicate with the sprue bush 10 into which the molten resin is injected, and a flow path 21 formed therein by being connected to the nozzle locator 11 through a gate. ) through which the molten resin is distributed through a manifold block 20 .

That is, the molten resin injected through the injection machine nozzle is supplied to the manifold block 20 through the sprue bush 10 and the nozzle locator 11, and the flow path 21 formed inside the manifold block 20 is After being transferred to the nozzle unit 5 configured in the lower part of the manifold block 20 while flowing along, for example, by being discharged to the cavity side of the mold, injection-molded products can be mass-produced.

Here, the manifold unit (4) is a dowel pin having both ends inserted into the holding plate (2) and the manifold block (20) in order to couple the manifold block (20) to the holding plate (2) in the correct position ( Dowel pin) and may further include a dowel pad fastened to the dowel pin (12).

For example, in the hot runner system, the manifold block 20 is generally configured between the upper clamping plate 1 and the lower holding plate 2 in the drawing, and the clamping plate 1 and the holding plate 2 ) may be interposed between the spacer plate 3 .

Meanwhile, the hot runner system according to an embodiment of the present invention further includes a pin guide bush 30 and a pin guide ring 40 interposed between the manifold block 20 and the clamping plate 1 .

The pin guide ring 40 is installed on the upper portion of the pin guide bush 30 for guiding the lifting and lowering of the valve pin 60 of the cylinder unit 6 configured on the upper portion of the manifold block 20 , the pin It is constructed while forming a junction (refer to 41 in FIG. 7) that can be referred to as a wetted part between the guide bush 30 and is interposed between the manifold block 20 and the clamping plate 1, so that the pin guide bush 30 is fixed. compression support.

The pin guide bush 30 has a structure in which the lower end is seated on the upper surface of the manifold block 20 in the drawing to guide the elevation of the valve pin 60 .

That is, the pin guide bush 30 and the pin guide ring 40 are common, and a central portion is formed to guide the elevation of the valve pin 60 , and the nozzle unit through the elevation of the valve pin 60 . A molten resin is supplied to (5).

The upper end of the valve pin 60 is connected to a cylinder set constituting the cylinder unit 6 , so that the valve pin 60 is raised and lowered in a way that interlocks with the cylinder set 61 . However, specific details related to the lifting and lowering of the valve pin 60 through the cylinder set 61 can be easily implemented from well-known techniques widely known in the art, and since there is no direct relation to the main technical features of the present invention, the following Make it clear in advance of omission.

Therefore, according to an embodiment of the present invention, the molten resin supplied to the manifold block 20 through the sprue bush 10 and the nozzle locator 11 is a flow path 21 formed inside the manifold block 20 . ) and then transferred to the nozzle unit 5 and discharged to the cavity side of the mold through the nozzle tip 51 constituting the nozzle unit 5 through the elevation of the valve pin 60, injection Molded products can be mass-produced.

4 to 8 , the hot runner system according to an embodiment of the present invention leaks through a gap formed between the sliding part 60a indicating the outer periphery of the valve pin 60 and the pin guide bush 30 . and a pin guide bush 30 and a pin guide ring 40 having vent holes 30a and 40a communicating with each other so as to discharge gas to the outside.

Herein, the vent holes 30a and 40a are respectively configured in the pin guide bush 30 and the pin guide ring 40. Hereinafter, for ease of explanation and understanding, the first vent hole 30a and the second vent Note that the hole 40a is referred to in advance.

That is, gas or the like may be generated in the molten resin during injection depending on the type of the molten resin and the content of additives including glass fibers and mineral fibers. And this gas flows through the gap formed between the sliding part 60a of the valve pin 60 and the pin guide bush 30 together with the molten resin and flows into the pin guide bush 30 and the pin guide ring to accumulate foreign substances. Sedimentation may occur.

For example, this phenomenon of depositing foreign substances and erosion caused by this phenomenon leads to a result of causing malfunction of the valve pin 60 due to solidification of the molten resin, and acts as a factor that deforms and breaks the valve pin 60 . However, it may shorten the life of the hot runner system.

Therefore, as a gas extraction structure for externally discharging gas leaking through the gap formed between the sliding part 60a of the valve pin 60 and the pin guide bush 30, the first and second vent holes 30a) (40a) is constituted.

The first vent hole 30a is formed by penetrating the column portion 32 formed on the upper portion of the seating portion 31 constituting the pin guide bush 30 in the horizontal direction in the drawing. And the second vent hole 40a is formed through the cylindrical body 42 constituting the pin guide ring 40, and communicates with the first vent hole 30a.

The first and second vent holes 30a and 40a may have a circular shape, an oval shape, a polygonal shape, or a slot shape, and are shown by showing a circular shape, an oval shape, and a slot shape.

In addition, the shapes of the first and second vent holes 30a and 40a may be linear, oblique, or refracted, and a straight shape is shown. Further, the directions of the first and second vent holes 30a and 40a may be formed in a straight line, a cross shape, or a radial shape, and a straight shape and a cross shape are shown.

Here, the pin guide ring 40 in which the second vent hole 40a of the slot type is configured can reinforce the loss of rigidity that may occur as the second vent hole 40a with an open upper portion is configured due to the characteristic of the slot type. It may include a reinforcing portion 40b configured to form a thick upper outer periphery so as to

In addition, the pin guide ring 40 and the pin guide bush 30 are formed in a structure capable of maintaining a constant sliding section with the sliding portion 60a even when the first and second vent holes 30a and 40a are configured. .
In other words, the pin guide bush 30 supplies the molten resin to the nozzle unit 5 to the manifold unit 4 that provides the molten resin injected from the outside along the flow path 21 of the manifold block 20 . , provided in the flow path 21 to guide the elevation of the valve pin 60 of the cylinder unit 6 is hollow, and a first vent hole 30a passing through the center in the horizontal direction is formed.
The pin guide ring 40 is hollow to guide the lifting and lowering of the valve pin 60 , and is provided concentrically on the upper portion of the pin guide bush 30 , and is horizontal to correspond to the first vent hole 30a. It has a second vent hole 40a slotting the center in the direction.
Accordingly, the first vent hole 30a and the second vent hole 40a may be configured to communicate with each other.
Here, the pin guide bush 30 is concentrically plugged into the seating portion 31 seated in the groove of the manifold block 20 at the lower portion and the pin guide ring 40 at the upper portion, and a first vent hole It may be integrally formed by including the pillar portion 32 having the 30a.
In addition, the pin guide ring 40 includes a reinforcing portion 40b that is further protruded around the upper periphery to reinforce the rigidity lost due to the second vent hole 40a slotted in the upper portion of the cylindrical body 42, and As it is integrally formed by including the junction part 41 at the lower end corresponding to the seating part 31, the outer peripheral surface of the seating part 31 and the outer peripheral surface of the cylindrical body 42 are matched to the manifold The pin guide bush 30 and the pin guide ring 40 can be plugged into the groove of the fold block 20 at the same time.

Therefore, according to an embodiment of the present invention, by discharging gas or the like to the outside of the manifold block 20 through the first and second vent holes 30a and 40a (see the lower arrow in FIG. 8 ), during maintenance It can be cleaned with only air, so maintenance of the hot runner system is easy, and this has the effect of extending the lifespan.

On the other hand, the hot runner system according to an embodiment of the present invention is configured on the pin guide bush 30 and the pin guide ring 40, the molten resin leaked through the first and second vent holes (30a, 40a) It may further include a pad 50 for preventing leakage to prevent the inflow into the cylinder unit (6).

The leak prevention pad 50 is formed in a circular plate shape and is, for example, bolted to the clamping plate 1 , and is configured on the pin guide bush 30 and the pin guide ring 40 , and is formed on the valve pin 60 . A central hole is formed so that the lifting is made.

Here, the central hole (50a) may be formed to a size that can be spaced between the valve pin (60), which is a consideration in consideration of the amount of thermal expansion of the pad for preventing leakage (50).

That is, the central hole 50a of the leak prevention pad 50 is inserted into the diameter of the valve pin 60 so as to prevent an obstacle to the lifting and lowering of the valve pin 60 due to thermal expansion of the leak prevention pad 50 . It is formed to be relatively larger, and the thickness of the central portion where the central hole 50a is formed is also relatively thinner than the outer portion.

Therefore, according to an embodiment of the present invention, the leakage preventing pad 50 is used to prevent the molten resin discharged to the outside through the first and second vent holes 30a and 40a from flowing back into the cylinder unit 6 . By being able to prevent it through (refer to the upper arrow of FIG. 8 ), the reliability of the hot runner system to which the gas release structure is applied can be improved.

Although the present invention has been described in detail through one embodiment, this is for describing the present invention in detail, and the hot runner system to which the gas extraction structure according to the present invention is applied 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 rather than other components, 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 by those skilled in the art to which the present invention pertains without departing from the essential characteristics of the present invention. Accordingly, one embodiment disclosed in the present invention is 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 this one embodiment. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1: Clamping plate 2: Holding plate
3: Spacer plate 4: Manifold unit
5: Nozzle unit 6: Cylinder unit
20: manifold block 21: euro
30: pin guide bush 30a: first vent hole
31: seating part 32: pillar part
40: pin guide ring 40a: second vent hole
40b: reinforcement part 41: joint part
42: cylindrical body 50: leak-proof pad
50a: center hole 60: valve pin
60a: sliding part 61: cylinder set

Claims (7)

The molten resin is supplied to the nozzle unit 5 through the manifold unit 4 that provides the molten resin injected from the outside along the flow path 21 of the manifold block 20, but is provided in the flow path 21 to the cylinder a pin guide bush 30 formed hollow to guide the elevation of the valve pin 60 of the unit 6 and having a first vent hole 30a passing through the center in the horizontal direction;
It is hollow to guide the lifting and lowering of the valve pin 60, and is provided concentrically on the upper part of the pin guide bush 30, and forms a slot with a center in the horizontal direction corresponding to the first vent hole 30a. The first vent hole 30a and the second vent hole 40a are configured to communicate with each other, including a pin guide ring 40 having a second vent hole 40a,
The pin guide bush 30 is concentrically plugged into a seating portion 31 seated in the groove of the manifold block 20 at the lower portion and the pin guide ring 40 at the upper portion, and a first vent hole 30a ), including the column part 32 having a
The pin guide ring 40 has a cylindrical body 42 and a reinforcing part 40b that is further protruded around the upper periphery to reinforce the rigidity lost due to the second vent hole 40a slotted thereon, and the seating part Corresponding to (31), including a junction part (41) at the lower end is made integrally,
The pin guide bush 30 and the pin guide ring 40 are simultaneously positioned in the groove of the manifold block 20 by matching the outer circumferential surface of the seating part 31 and the outer circumferential surface of the cylindrical body 42 . A hot runner system with a degassing structure, characterized in that it is plugged in.
delete delete delete delete The method according to claim 1,
The molten resin configured on the upper part of the pin guide bush 30 and the pin guide ring 40 and discharged to the outside through the first vent hole 30a and the second vent hole 40a flows into the cylinder unit 6 . a pad 50 for preventing leakage to prevent being;
A hot runner system to which a gas relief structure is further included.
7. The method of claim 6,
The leak prevention pad 50 has a center hole 50a formed so that the valve pin 60 can be lifted up and down, and the center hole 50a is formed to a size that can be spaced apart from the valve pin 60 . A hot runner system with an outgassing structure.

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