KR101527067B1 - air vent device for injection mold - Google Patents

Abstract

The present invention relates to an air vent device for injection molding, which discharges air from a molding space to the outside when emitting a molding material, and more specifically, to an air vent device for injection molding, capable of guaranteeing operational reliability to be rapidly and precisely operated regardless of an installation direction as a guide groove is formed to maintain regular distance to smoothly elevate a rise induction ball which rapidly operates an intermittent core.

Description

Technical Field [0001] The present invention relates to an air vent device for an injection mold,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an air vent apparatus for an injection mold that discharges gas existing in a molding space at the time of injection of a molding material to the outside, more specifically, The present invention relates to an air vent apparatus for an injection mold, which is provided with guide grooves for ensuring operation reliability so as to be operated quickly and accurately irrespective of an installation direction.

In general, injection molding is a molding method used when a plastic molded article is manufactured from a plastic material, and a molten material is injected into the molding space formed inside the mold corresponding to the outer shape of the molded article at a high pressure, Thereby forming a molded article having a shape corresponding to the space.

Here, when the material is injected and molded into the molding space of the mold in the injection molding process, the air present in the molding space and the gas containing the gas generated by the material directly act on the molded article, There is a problem that the quality of the molded product is deteriorated due to the occurrence of black spots.

In order to solve the above-mentioned problems, there is a need for an injection molding machine having a discharge passage formed at one side of a molding space for discharging a gas existing inside a molding space at the time of injection of a molding material to one side of an injection mold, And a spring for elastically supporting the opening / closing port upward from the front end of the discharge passage.

That is, in the state of being supported upward by the spring, the opening / closing port is lowered by the injection pressure of the molding material to open the discharge passage, and the gas in the molding space is discharged to the outside through the discharge passage.

However, in the above-described conventional air vent apparatus, since the discharge passage is interrupted only by the opening and closing port, the injection pressure of the molding material is weakened, and when the discharge passage is blocked by the opening / closing port, A clogging occurred in which the discharge passage was blocked by the molding material.

Due to such a closed end, the above-described air vent apparatus has a problem that air and gas can not be surely discharged properly, which makes it difficult to ensure the excellent quality of the molded article.

Accordingly, in order to improve the quality of a molded product, it is urgent to develop an air vent device having an improved structure that can quickly shut off the discharge passage so that the molding material does not flow out.

Domestic public utility model publication No. 20-1999-0016491, May 25, 1999.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a structure capable of performing a quick and accurate operation when a discharge passage is opened to discharge a gas in a molding space, And it is an object of the present invention to provide an air vent apparatus for an injection mold that ensures quick operation.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood from the following description.

In order to attain the above object, the present invention provides an air vent apparatus for an injection mold, which ensures operational reliability according to the present invention, in which a gas present in a molding space at the time of injection of a molding material is discharged to the outside through a discharge passage, A first receiving space provided at the front end of the discharge passage for communicating the molding space with the discharge passage and a lower discharge hole communicating with the upper space and the lower discharge space, A body on which an inclined surface is swept; An upper discharge hole is formed in the first accommodation space so as to be able to move up and down, a pressure acting surface is formed on the upper side, and a communication hole communicates with the molding space and the lower discharge hole along the center, A pressure core in which a second induction slope inclined downward is formed on an inner surface of the first accommodating space; An intermittent core which is installed in the second accommodating space so as to be able to move up and down, an intermittent portion for interrupting the upper exhaust hole protrudes from the upper end, and a third induction sloped surface inclined upward from the lower end outer surface; An elastic member provided inside the second accommodation space and elastically supporting the pressure core and the intermittent core such that the pressure core and the intermittent core are in an ascending state and a descending state, respectively; And a second guiding sloping surface provided between the first guiding sloping surface, the second guiding sloping surface, and the third guiding sloping surface to move upwardly when the pressure core is moved downward by the injection pressure of the molding material, A plurality of lifting guiding balls for closing the upper discharging hole by a piece to close the discharging passage; And guide grooves formed on at least one of the first guide sloped surface, the second guide sloped surface, and the third guide sloped surface in a vertical direction to guide the lifting guide ball to move up and down while maintaining a predetermined gap therebetween .

And the guide grooves are radially arranged while maintaining a predetermined distance corresponding to the number of the guide rails.

A pin hole is formed in the upper portion of the body, a pin insertion hole in the form of a slot is formed in a vertical direction on one side of the upper portion of the pressure core, and an end is fixed through the pin through hole, And a restraining pin is inserted into the hole so that the lifting stroke of the pressure core is limited by the restraining pin.

And the body is fixedly installed in a threaded manner or in a press-fit manner inside the tip of the discharge passage.

And a gripping groove is formed in the upper surface of the body for receiving the gripping protrusion of the fastening tool for screwing the body into the distal end of the discharge passage.

The pressure acting surface may be formed in a planar shape or in a sloped shape.

Effects that can be expected from the present invention with the above-described configuration are as follows.

First, the gas existing in the molding space at the time of injection of the molding material can be effectively discharged through the discharge passage along the passage secured by the pressure core and the intermittent core.

And after the gas is discharged, the passage is rapidly closed through the downward movement of the pressure core and the upward movement of the intermittent core, thereby effectively preventing the blocking of the molding material injected into the molding space into the discharge passage .

In addition, a plurality of lifting guide balls for lifting the intermittent core by the downward movement of the pressure core are maintained at a constant interval by the guide grooves, and smooth movement of the intermittent core is smoothly performed regardless of the installation direction There is an effect that can be done.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an air vent apparatus for an injection mold that assures operational reliability according to a preferred embodiment of the present invention; FIG.
FIG. 2 is a plan view and a longitudinal sectional view showing a body of an air vent apparatus for an injection mold that assures operational reliability according to a preferred embodiment of the present invention. FIG.
3 is a bottom view and a longitudinal sectional view showing a pressure core of an air vent apparatus for an injection mold that assures operating reliability according to a preferred embodiment of the present invention.
4 is a side view and a bottom view of an intermittent core of an air vent apparatus for an injection mold that assures operational reliability according to a preferred embodiment of the present invention.
The present invention relates to an air vent apparatus for an injection molding machine, and more particularly, to an air vent apparatus for an injection molding machine which assures operational reliability according to a preferred embodiment of the present invention.
6 to 8 are longitudinal cross-sectional views illustrating an operation of an air vent apparatus for an injection mold that assures operational reliability according to a preferred embodiment of the present invention.
FIG. 9 is a vertical sectional view showing a state where a tool for installation and separation is coupled to an air vent apparatus for an injection mold, which ensures operational reliability according to a preferred embodiment of the present invention.

The air vent apparatus for an injection mold according to the present invention is installed inside the tip end of a discharge passage provided in an injection mold, so that when the molding material is injected into the molding space, air existing in the molding space and gas Is discharged to the outside through the discharge passage.

Particularly, in the air vent apparatus for an injection mold according to the present invention, the closing operation for preventing the molding material injected into the molding space from flowing out to the discharge passage after completion of the gas existing in the molding space through the opening operation is quick This is a great feature that it is done correctly.

According to this aspect of the present invention, there is provided an injection molding machine comprising: a body having a discharge hole communicating a molding space and a discharge passage; a pressure core that moves downward in accordance with an injection pressure provided on the body; an intermittent core that interrupts the discharge hole when the pressure core moves down; An elastic member for resiliently supporting the pressure core and the intermittent core in an ascending state and a descending state, a plurality of ascending induction balls for ascending movement of the intermittent core while moving upward while the pressure core is descending, And guide grooves for guiding the guide grooves to maintain a constant gap when the guide grooves are formed.

Hereinafter, an air vent apparatus for an injection mold according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a plan view and a longitudinal sectional view showing the body of the present invention, Fig. 3 is a bottom view and a longitudinal section showing the pressure core of the present invention, Fig. 4 Fig. 5 is a view for explaining the up-and-down movement of the lifting guide ball according to the guide groove of the present invention, and Figs. 6 to 8 are views for explaining the operation of the present invention And FIG. 9 is a longitudinal sectional view showing a state in which an installation tool for installation and separation is coupled to the present invention.

1, an air vent apparatus for an injection mold according to a preferred embodiment of the present invention includes a body 100, a pressure core 200, an intermittent core 300, an elastic member 400, An induction ball 500, and a guide groove 600.

The body 100 is configured to be fixed to the front end of the discharge passage E to communicate the discharge passage E with the molding space C of the injection mold in which the molding material R is injected.

2, the body 100 is provided with a first accommodation space 110 and a lower exhaust hole 120 at upper and lower portions thereof for communication between the molding space C and the discharge passage E, And a first induction slope 130 inclined downward is formed on the inner bottom portion of the first accommodation space 110. [

That is, the body 100 is supported by the pressure core 200, the intermittent core 300, and the lifting guide ball 500 so as to be vertically movable from the inner side while being fixed to the inside of the front end of the discharge passage E.

On the other hand, the body 100 may be screw-coupled to the inside of the tip end of the discharge passage E through a screw connection, or may be fixedly installed by press-fitting through the impact of the tool.

In this case, in order for the body 100 to be installed on the discharge passage E in a screwed manner, a male screw 140 is formed on the outer surface of the lower end of the body 100 as shown in FIGS. 1 and 6, It is preferable that a female screw S corresponding to the male screw 140 of the body 100 is formed.

In order to rotate the body 100 with the fastening tool T for screw engagement, as shown in FIG. 9, the gripping protrusion B of the fastening tool T is inserted into the upper surface of the body 100, (150) is formed.

The outer diameter of the body 100 and the inner diameter of the discharge passage E are set such that the body 100 is prevented from being inserted into the discharge passage E in order to install the body 100 in the discharge passage E It is desirable to be configured to be able to

The pressure core 200 is installed in the first accommodation space 110 of the body 100 so as to be movable up and down so that the molding material R is discharged to the discharge space E ) Is closed.

3, the pressure core 200 is formed with a pressure acting surface 210 to which an injection pressure is applied on the upper side, and a molding space C and a lower discharge hole 120 of the body 100 A second accommodating space 230 at the lower end and a second guiding inclined surface 240 inclined downward on the inner surface of the first accommodating space 110 are formed in a manner .

In other words, the pressure core 200 maintains the raised state, and the injection pressure of the molding material R rises above the reference pressure and is applied to the pressure acting surface 210 to move downward.

For example, as shown in FIG. 6, during the initial stage of injection in which the molding material R is injected, the mold is maintained in an elevated state and starts to descend from the middle of injection molding, in which the molding material R is partially filled in the molding space C, 8, it is completely lowered in the later stage of injection in which injection is completed.

As shown in FIG. 3, the pressure action surface 210 to which the injection pressure of the molding material R is applied may be formed as an inclined surface inclined upward toward the center, or may be formed in a flat shape .

Meanwhile, it is preferable that the pressure core 200 is installed so that the lifting and lowering stroke is constant without being separated from the body 100. To this end, the pressure core 200 is installed to have a constant lift stroke on the body 100 by the restraining pins 260.

1, a fin-shaped through hole 160 is formed in one side of the body 100 and is fixed in a state in which the restricting pin 260 passes through the through hole. At one side of the pressure core 200, A pin insertion hole 250 in the form of a slot into which the end portion of the pin insertion hole 260 is inserted should be formed.

Next, the intermittent core 300 is installed in the second accommodation space 230 of the pressure core 200 so as to be movable up and down, and when the pressure core 200 is moved downward by the injection pressure of the molding material R The upper discharge hole 220 of the pressure core 200 for communicating the molding space C and the lower discharge hole 120 of the body 100 is closed.

7 to 8, the intermittent core 300 is moved up and down as opposed to the pressure core 200. The pressure core 200 is moved downward in accordance with the injection pressure of the molding material R, The discharge passage E is quickly closed so that the molding material R does not flow out to the discharge passage E by blocking the upper discharge hole 220 of the discharge passage 200. [

4, the intermittent core 300 includes an intermittent piece 310 for protruding the upper discharge hole 220 of the pressure core 200 at the upper end thereof, It is preferable that the guide slope surface 320 is formed in a rounded shape.

Next, the elastic member 400 elastically supports the pressure core 200 and the intermittent core 300 in the second accommodation space 230.

That is, the elastic member 400 elastically supports the pressure core 200 up and down and elastically supports the intermittent core 300 downward.

The elastic member 400 may be installed in the second accommodation space 230 between the pressure core 200 and the intermittent core 300 as shown in FIG.

The elastic member 400 is configured to have a modulus of elasticity to such an extent that the injection pressure is compressed when the injection pressure acts above the reference pressure so as to ensure the downward movement of the pressure core 200 according to the injection pressure of the molding material R .

That is, the elastic member 400 compresses only when the injection pressure of the molding material R acts on the pressure acting surface 210 of the pressure core 200, so that the pressure core 200 can move downward.

The ascending induction ball 500 is connected to the first induction sloping surface 130 of the body 100 and the second induction sloping surface 240 of the pressure core 200 and the third induction sloping surface 320 of the interrupting core 300 So as to push the intermittent core 300 up and down when the pressure core 200 moves downward.

To this end, the elevation inducing ball 500 is constituted by a plurality of elevation inducing balls 500, and the elevation inducing ball 500 is divided into a first induction slope 130, a second induction slope 240 and a third induction slope 320, as shown in FIGS. 1 and 5 (a) The first guide slope 130, the second guide slope 240, and the third guide slope 320 may be spaced apart from each other by a predetermined distance so as to contact the outer surface.

That is, when the pressure core 200 is lowered and the intermittent core 300 is moved upward, the lifting guide ball 500 is moved toward the intermittent core 300 by a pressing force of the second guiding slant surface 240 At the same time, the third guide sloping surface 320 is lifted upward while riding on the first guide sloping surface 130 to induce the upward movement of the interlocking core 300.

The intermittent core 300 is moved upward by the action of the rising guide ball 500 to block the upper discharge hole 220 of the pressure core 200 to discharge the molding material R into the discharge passage E The passage E is quickly closed.

Lastly, the guide groove 600 is configured to guide the lifting guide ball 500 to move while maintaining a constant interval.

That is, the guide groove 600 is formed by the change in diameter and the weight of the guide groove 600 when the upward guide ball 500 moves upward (slanting) upward toward the center of the body 100 in accordance with the downward movement of the pressure core 200 So that they are guided to move while maintaining a predetermined gap therebetween.

To this end, the guide groove 600 is formed on at least one of the first induction slant face 130, the second induction slant face 240 of the pressure core 200, and the third induction slant face 320 of the intermittent core 300 . According to a preferred embodiment, the guide groove 600 may be formed on the third guiding slanting surface 320 of the interrupted core 300 as shown in FIG.

At this time, it is preferable that the guide grooves 600 are formed to be radially arranged while keeping a predetermined distance from each other by the number corresponding to the number of the rising guide balls 500. The guide groove 600 may be curved so as to correspond to the spherical rising guide ball 500.

5 (b) and 5 (b) by moving the elevating guide ball 500 while maintaining a constant interval as shown in FIG. 5 (a), regardless of the installation direction of the body 100, As a result, it is possible to prevent the climbing motion of the intermittent core 300 from rising due to a change in diameter and self weight while preventing the intermittent core 300 from moving upward.

Therefore, even if the body 100 is installed vertically or horizontally or inclined, the intermittent core 300 smoothly moves upward in accordance with the movement of the lifting guide balls 500 regardless of the installation direction, Thereby assuring operational reliability of the device.

As described above, in the air vent apparatus for injection molds according to the present invention, the pressure core is lowered according to the injection pressure, and at the same time, the intermittent core moves up smoothly by the upward guide ball and the guide groove, It is possible to reliably prevent the molding material injected into the molding space from flowing out to the discharge passage.

The above-described embodiments are merely illustrative, and various modifications may be made by those skilled in the art without departing from the scope of the present invention.

Therefore, the true technical protection scope of the present invention should include not only the above embodiments but also various other modified embodiments according to the technical idea of the invention described in the following claims.

100: Body
110: first accommodation space
120: Lower discharge hole
130: first induction slope
140: Male thread
150: gripping groove
160: Pin through hole
200: pressure core
210: pressure acting face
220: upper discharge hole
230: second accommodation space
240: second induction slope
250: Pin insertion hole
260:
300: interrupted core
310: Interrupt pin
320: third induction slope
400: elastic member
500: Lift-up ball
600: Guide groove
C: Molding space
R: molding material
E: discharge passage
S: Female threads
T: Fastening tool
B:

Claims (6)

An air vent apparatus for an injection mold for discharging a gas existing in a molding space at the time of injection of a molding material through an exhaust passage,
A first receiving space provided at the front end of the discharge passage for communicating the molding space with the discharge passage and a lower discharge hole communicating with the upper space and the lower discharge space, A body on which an inclined surface is swept;
An upper discharge hole is formed in the first accommodation space so as to be able to move up and down, a pressure acting surface is formed on the upper side, and a communication hole communicates with the molding space and the lower discharge hole along the center, A pressure core in which a second induction slope inclined downward is formed on an inner surface of the first accommodating space;
An intermittent core which is installed in the second accommodating space so as to be able to move up and down, an intermittent portion for interrupting the upper exhaust hole protrudes from the upper end, and a third induction sloped surface inclined upward from the lower end outer surface;
An elastic member provided inside the second accommodation space and elastically supporting the pressure core and the intermittent core such that the pressure core and the intermittent core are in an ascending state and a descending state, respectively;
And a second guiding sloping surface provided between the first guiding sloping surface, the second guiding sloping surface, and the third guiding sloping surface to move upwardly when the pressure core is moved downward by the injection pressure of the molding material, A plurality of lifting guiding balls for closing the upper discharging hole by a piece to close the discharging passage; And
And guide grooves formed on at least one of the first guide sloping face, the second guide sloping face and the third guide sloping face in a vertical direction to guide the lifting guide ball to move up and down while maintaining a predetermined gap therebetween Wherein the air venting device is provided with an air venting device. The method according to claim 1,
Wherein the guide grooves are arranged radially while maintaining a predetermined distance from the guide grooves corresponding to the number of the guide rails. The method according to claim 1,
A pin through-hole in the form of a single hole is formed through one side of the upper portion of the body
A pin insertion hole in the form of a long hole is formed in the upper portion of the upper portion of the pressure core
And a restraining pin is provided in which the end portion is inserted into the pin insertion hole while being fixed through the pin through-hole
Wherein an ascending / descending stroke of the pressure core is restricted by the restraining pin. The method according to claim 1,
Wherein the body is fixed to the inside of a front end of the discharge passage in a screw-fitting manner or in a press-fitting manner. 5. The method of claim 4,
And a gripping groove into which a gripping protrusion of the tightening tool is inserted is formed on an upper surface of the body so that the body is screwed into the inside of the tip end of the discharge passage. Device. The method according to claim 1,
Wherein the pressure acting surface is formed in a planar shape or in a sloped shape. [5] The air vent apparatus for an injection mold according to claim 1,

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