KR20170111058A - LSR-type injection molding equipment - Google Patents

Abstract

The present invention relates to a method for producing a liquid silicone rubber composition, which comprises a raw material storage part (100) for storing one or more raw materials of a rubber series or a silicone series, a raw material storing part (100) A quantitative control valve 300 for controlling the discharge amount of the liquid silicone rubber supplied from the material manufacturing part 200 and a control valve 300 for controlling the flow rate of the liquid silicone rubber, A screw chamber part 400 to which a liquid silicone rubber discharged from the screw chamber part 400 is supplied and a screw (not shown) to be rotated therein is formed in the screw chamber part 400; The amount of the liquid silicone rubber to be injected into the mold part 600 is controlled by adjusting the amount of the liquid silicone rubber.

Description

Injection molding equipment for liquid silicone rubber {LSR-type injection molding equipment}

The present invention relates to an injection molding machine for liquid silicone rubber, which comprises a raw material storage part (100) for storing raw materials of at least one of rubber series and silicon series, (200) for mixing the raw material and the at least one coloring agent to produce a liquid silicone rubber; a quantitative control valve (200) for controlling a discharge amount (discharge amount) of the liquid silicone rubber supplied from the material manufacturing part A screw chamber part 400 for receiving a liquid silicone rubber discharged from the quantitative control valve 300 and forming a screw (not shown) to be rotated inside the screw chamber part 400; (500) for injecting the liquid silicone rubber into the mold section (600) by controlling the amount of ejection (ejection amount) of the liquid silicone rubber supplied from the ejection molding section Relate to.

Generally, LIQUID SILICON RUBBER (abbreviated as 'LSR') is a synthetic rubber made of crosslinked polymer reinforced with silica. It is a synthetic rubber which has mechanical and chemical properties It is a trend that is being used to demand balance.

The spread of such a liquid silicone rubber diffuses because the raw material maker adjusts the components and supplies the standard product so that the entire preparation step of the raw material is unnecessary, so that the storage property is good and the working environment at the time of molding is good.

In addition, since the curing time is as short as one-half of that in the case of compression molding using ordinary rubber, the number of molds can be reduced so much that the productivity is enhanced and the utility of the liquid silicone rubber is increased .

 The liquid silicone rubber is an elastic raw material having flexibility and compete with the TP elastomer. However, the liquid silicone rubber is widely used because it has high heat resistance, elasticity, durability and good feel.

In addition, the filler-containing material has a shrinkage close to zero, and it is possible to carry out composite bonding molding without pretreatment coating, thereby achieving high functionality and high added value, and low-pressure molding is possible because the raw material maintains a low viscosity state. There is also an advantage of not damaging the bag.

Such molded articles using liquid silicone rubber are manufactured for the purpose of use, and examples of the molded articles that utilize the feeling of cleanliness include medical instruments, seals for machine packing, nursing bottle nipples, catheter parts, Molded parts that are utilized include anode caps, grommet, plug boots, heat resistant packing, thermos bottle packing, lunch bag packing, wire seal and inner seal. Molded products utilizing elasticity, long service life and transparency include computer keyboard, And submerged mask parts. Molded products utilizing the offset property and heat resistance of silicone rubber include copiers and facsimiles.

When a product is produced using such a liquid silicone rubber, molding is performed through molding equipment capable of operations such as extrusion molding, injection molding, compression molding, calendering, etc. As one example of such molding equipment, 1 " Rubber Injection Apparatus for Rubber Injection Molding Machine " (Korean Utility Model Registration Utility Model No. 20-0413967).

The rubber injection device for a rubber injection molding machine according to Patent Document 1 is characterized in that a plurality of injection pillars 11 which maintain a certain distance are mounted on the upper frame 24 and the end of the rod 13a is connected to the upper frame 24, A nozzle touch plate 12 symmetrically attached to both end portions of a plurality of nozzle touch cylinders 13 fastened to the injection nozzle 11 is moved up and down with respect to the injection support 11, And a plurality of bearing cylinders 15 mounted on a rod 15a on the upper surface of the nozzle touch plate 12 are mounted on the upper surface of the nozzle touch plate 12, B and a screw clutch 17 mounted with a fixed ring 17a and a screw motor 18 mounted on the screw motor 17 and a screw 19 incorporated in the screw chamber 16 are connected to each other, Air is injected into the rubber raw material due to the residual air, It had been a preventive benefit of being able to prevent degradation caused by air bubbles.

However, in the " rubber injection apparatus for rubber injection molding machine " in Patent Document 1, there is no separate structure for controlling the injection amount of the rubber raw material in the process of injecting the rubber raw material into the screw chamber and injecting the rubber raw material through the nozzle into the mold, When the raw material is excessively injected, the rubber raw material flows out of the screw chamber to increase the disappearance rate of the rubber raw material, thereby increasing the production cost, and the lost rubber raw material is injected into the injection molding equipment, resulting in malfunction and reduced productivity , When the rubber raw material is under-injected, a certain amount of the rubber raw material can not be injected into the screw chamber, resulting in an increase in the defective rate of the product.

Patent Document 1: Korean Utility Model Registration No. 20-0413967

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a liquid silicone rubber which is mixed with a plurality of raw materials and a colorant, The valve is constituted and the quantity of the liquid silicone rubber to be supplied through the screw chamber part is injected in such a manner that all of the liquid silicone rubber is injected in a fixed amount to supply the most suitable amount of the liquid silicone rubber to the mold part, Injection molding machine for liquid silicone rubber.

In order to solve the above problems, the injection molding machine for liquid silicone rubber according to the present invention comprises a raw material storage part 100 storing raw materials of at least one of rubber series and silicone series, (200) for supplying the raw material from the material producing unit (200) and mixing the supplied raw material with at least one coloring agent to produce a liquid silicone rubber; A screw chamber 400 in which a liquid silicone rubber discharged from the quantitative control valve 300 is supplied and a screw (not shown) is formed to rotate the liquid silicone rubber, And a fixed amount injector 500 for injecting the liquid silicone rubber into the mold part 600 by controlling the amount of ejection of the liquid silicone rubber supplied from the screw chamber part 400 .

Further, the quantitative control valve 300 may be configured such that,

The injection part 311 for injecting the liquid silicone rubber is formed on one side and the discharge part 312 for discharging the liquid silicone rubber is formed on the other side and the injection part 311 and the discharge part 312 A first housing 310 formed of an opening and closing hole 314 extending from the movement passage 313 is formed,

A sealing plate 320 coupled to the first housing 310 and having a first through hole 321 formed therein,

A first receiving portion 331 formed in a space on the inside and an insertion groove 333 formed on an inner rear surface of the first receiving portion 331, A second housing 330 having first and second pressure pipes 334 and 335 spaced apart from each other is formed on one side of the first housing 330,

The first and second pressure pipes 334 and 335 are installed in the first accommodating portion 331 and are moved in the forward and backward directions according to the air pressure provided to the first and second pressure pipes 334 and 335, An opening and closing shaft 341 for opening and closing the opening and closing hole 314 is formed and a first moving disc 340 is formed on the inner side to form an insertion portion 342 to be inserted into the insertion groove 333 .

In addition, the quantitative spraying unit 500 may include:

And a third housing (not shown) including an ejection nozzle member 511 having an ejection shaft moving groove 512 having a long axis and a jetting channel 513 for ejecting the liquid silicone rubber, 510)

A second receiving portion 521 is formed on the inner side and a first moving hole 523 is formed on the inner side rear side of the second receiving portion 521. The first receiving hole 521 is connected to the third housing 510, The second and third connecting protrusions 522 and 523 are formed on the first and second connecting protrusions 522 and 523, respectively. The first and second connecting protrusions 522 and 523 are connected to the first and second moving holes 523 and 523, respectively. And a coupling screw member 526 on which the second moving hole 527 is formed,

And is moved in the forward and backward directions according to the air pressure provided to the third and fourth pressure pipes 524 and 525 and inserted into the ejection shaft moving groove 512 at the front surface thereof, A third moving hole 532 connected to the first moving hole 523 is formed inside the first moving hole 523 and an ejection shaft 531 made of an ejection hole 533 connected to the third moving hole 532 is formed on a front surface of the third moving hole 532, And a second moving disc 530 having a fourth moving hole 534 extending from the third moving hole 532 and connected to the first moving hole 523 is formed on the inner side .

As described above, according to the present invention, the quantitative control valve is configured to inject a predetermined amount of the liquid silicone rubber into the screw chamber portion in the process of injecting the liquid silicone rubber mixed with the plurality of raw materials and the colorant into the mold, The amount of the liquid silicone rubber most suitable for injection molding is supplied to the mold part so that a complete and reliable product can be produced by constituting the fixed amount injecting part so that a fixed amount of liquid silicone rubber supplied through the part is injected have.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing the entirety of an injection molding machine for liquid silicone rubber according to a preferred embodiment of the present invention; Fig.
FIG. 2 is a perspective view showing an entire configuration of a quantitative control valve in the configuration of injection molding equipment for liquid silicone rubber according to a preferred embodiment of the present invention. FIG.
3 is an exploded perspective view showing an exploded view of a quantitative control valve in the configuration of an injection molding machine for liquid silicone rubber according to a preferred embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a cross-sectional view of a quantitative control valve among constitutions of injection molding machines for liquid silicone rubber according to a preferred embodiment of the present invention
FIG. 5 is a perspective view showing the entire structure of a quantitative spraying unit in the constitution of an injection molding machine for liquid silicone rubber according to a preferred embodiment of the present invention. FIG.
FIG. 6 is an exploded perspective view showing a disassembled state of a quantitative ejection portion in the constitution of an injection molding machine for liquid silicone rubber according to a preferred embodiment of the present invention. FIG.
FIG. 7 is a cross-sectional view showing a cross-sectional view of a quantitative ejection portion of a constitution of an injection molding machine for liquid silicone rubber according to a preferred embodiment of the present invention

Hereinafter, an injection molding apparatus 1 for a liquid silicone rubber according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that, in the drawings, the same components or parts are denoted by the same reference numerals whenever possible. In describing the present invention, a detailed description of known functions and configurations incorporated herein will be omitted so as to avoid obscuring the subject matter of the present invention.

1, 2, and 5, an injection molding machine 1 for a liquid silicone rubber according to an embodiment of the present invention roughly includes a raw material storage unit 100, a material manufacturing unit 200, 300, a screw chamber part 400, and a fixed amount injecting part 500.

Prior to the explanation, it should be noted that the lower portion is set as the front side and the upper side as the rear side with reference to Fig. 2 or Fig.

First, the raw material storage unit 100 will be described. 1, at least one raw material such as a rubber-based material or a silicon-based material, which is a raw material of the liquid silicone rubber, is stored, and the raw material storage unit 100 is connected to a material- And supplies the raw material to the material manufacturing unit 200. The detailed description will be omitted because it corresponds to a level of technology that is already well known in the art to which the present invention belongs.

Next, the material manufacturing section 200 will be described. As shown in FIG. 1, the material manufacturing unit 200 is a component for mixing one or more raw materials supplied from the raw material storage unit 100 with a coloring agent for coloring. Level technical level, detailed description thereof will be omitted.

Next, the quantitative control valve 300 will be described. As shown in FIGS. 2 to 4, the quantitative control valve 300 regulates the discharge amount (discharge amount) of the liquid silicone rubber supplied from the material manufacturing portion 200 so that the liquid silicone rubber is supplied to the screw chamber The first housing 310, the sealing plate 320, the second housing 330, and the first moving disc 340. The first housing 310, the sealing plate 320, the second housing 330,

The first housing 310 is a component in which a flow path is formed so that the liquid silicone rubber supplied from the material manufacturing portion 200 is moved to a screw chamber portion 400 to be described later, A discharging portion 312 for discharging the liquid silicone rubber is formed on the other side and a discharging portion 312 for discharging the liquid silicone rubber is formed on the inside of the discharging portion 311, (313) are formed.

The opening and closing shaft 341, which will be described later, is inserted into or drawn out from the moving passage 313 during the movement of the liquid silicone rubber injected through the input portion 311 to the discharging portion 312, The discharge amount (discharge amount) of the liquid silicone rubber discharged to the discharge portion 312 by the opening / closing shaft 341 can be adjusted by forming the opening / closing hole 314 so as to interfere with the discharge /

The sealing plate 320 is provided between the first housing 310 and the second housing 330 to seal the inside of the second housing 330. The opening and closing shaft 341 A first through hole 321 is formed so that the opening and closing hole 314 can be opened and closed.

The second housing 330 is a component for receiving a first moving disc 340, which will be described later, which is coupled to the closing plate 320 to open and close the opening / closing hole 314 according to forward and backward movement, And a first accommodating portion 331 having a space for accommodating the first moving disc 340 is formed on the inner side.

The first moving disc 340 is connected to the insertion portion 342 of the first moving disc 340 to be described later, and the first moving disc 340 is moved in the forward and backward directions. A first connection projection 332 for guiding the correct movement is formed.

At this time, the insertion portion 342 is inserted into the insertion groove 333 which is formed inwardly of the first connection protrusion 332.

In the present invention, first and second pressure pipes 334 and 335, which provide air pressure to the first accommodating portion 331 through air supplied from the outside, are provided at one side of the second housing 330, The first and second pressure chambers 334 and 335 may be spaced apart from each other by a predetermined distance. As the air is selectively injected into either the first pressure pipe 334 or the second pressure pipe 335, The opening / closing shaft 341 is moved in the forward or backward direction by the air pressure so that the opening / closing shaft 341 can open / close the opening / closing hole 314 to interfere with the movement of the liquid silicone rubber.

The first moving disc 340 is installed in the first accommodating portion 331 and is moved in the forward and backward directions according to the air pressure provided to the first and second pressure pipes 334 and 335, An opening and closing shaft 341 for opening and closing the opening and closing hole 314 is formed in the front surface of the housing 31 and an insertion opening 333 inserted in the insertion groove 333 is formed in the inside of the opening and closing shaft 341, A portion 342 is formed.

Next, the screw chamber part 400 will be described. 1, the screw chamber part 400 is filled with a liquid silicone rubber discharged to the quantitative control valve 300 into a screw (not shown) rotatably installed therein, ), Which corresponds to a level of technology well known in the technical field to which the present invention belongs, and thus a detailed description thereof will be omitted.

Next, the quantitative spraying unit 500 will be described. 5 to 7, the quantitative sparger 500 adjusts the amount of squirt of the liquid silicone rubber supplied from the screw chamber 400 to adjust the quantity of the liquid silicone rubber to the size of the mold 600, and includes a third housing 510, a fourth housing 520, and a second moving disk 530.

The third housing 510 is coupled to a fourth housing 520 to be described later and allows the second moving disk 530, which will be described later, provided inside the fourth housing 520 to be housed in a closed state, The injection shaft 531 is inserted into the front surface of the screw shaft 531 to inject liquid silicone rubber supplied from the screw chamber part 400 into the mold part 600 according to whether or not the injection shaft 531 is moved. A jetting nozzle member 511 in which a jetting passage 513 in which a liquid silicone rubber is jetted is formed on the entire surface of the jetting shaft moving groove 512, .

The fourth housing 520 is a component that is coupled to the third housing 510 and accommodates a second moving disk 530 to be described later, which opens and closes the jetting passage 513 in accordance with whether the jetting passage 513 is moved forward or backward And a second receiving portion 521 formed in a space such that the second moving disk 530 is accommodated therein.

The second moving disc 530 is connected to the fourth moving hole 534 of the second moving disc 530, which will be described later, on the inner rear surface of the second moving disc 530. In the course of moving the second moving disc 530 in the forward and backward directions, A second connecting protrusion 522 is formed to guide the precise movement of the second connecting protrusion 522. [

The fourth moving hole 534 is connected to the second moving hole 527 through which the liquid silicone rubber is injected into the second connecting protrusion 522 and the fourth moving hole 534, To move the liquid silicone rubber to the third moving hole 532 connected to the third moving hole 532.

In the present invention, one end of the fourth housing 520 is provided with a third, fourth, fifth, sixth, seventh, and eighth airbags, respectively, for supplying air pressure to the second accommodating portion 521 through air supplied from the outside, And the fourth pressure pipe 524 and the second pressure pipe 525 are spaced apart from each other. As the air is selectively injected into either the third pressure pipe 524 or the fourth pressure pipe 525, The second moving disc 530 provided inside the first moving disc 530 is moved forward or backward by the air pressure so that the ejection shaft 531 opens and closes the ejection flow path 513 to interfere with the ejection of the liquid silicone rubber Lt; / RTI >

The second moving disk 530 is installed in the second accommodating portion 521 and is moved in the forward and backward directions according to the air pressure provided to the third and fourth pressure pipes 524 and 525, And a third moving hole 532 inserted into the ejection shaft moving groove 512 and connected to the first moving hole 523 is formed on the inside of the ejection shaft moving groove 512, And an ejection shaft 533 connected to the third movement hole 532 and opening and closing the ejection flow passage 513 is formed on the inner side of the ejection hole 533, And a fourth moving hole 534 connected to the first moving hole 523 is formed.

On the other hand, inner peripheral surfaces of the first and second movable discs 340 and 530, the first through hole 321, the opening / closing hole 214, and the ejection shaft moving groove 512, It is preferable that a rubber ring member 700 is provided.

Hereinafter, the operation of the injection molding machine 1 for liquid silicone rubber according to one embodiment of the present invention will be described with reference to FIG. 1, FIG. 4 or FIG.

First, a raw material is supplied to the material manufacturing unit 200 by mechanical operation in a state where one or more raw materials such as a rubber series or a silicon series are stored in the raw material storage unit 100 first.

Then, the raw material supplied to the material manufacturing part 200 is made of liquid silicone rubber mixed with a coloring agent which is colored, and then supplied to the quantitative control valve 300 by mechanical operation.

The liquid silicone rubber supplied to the quantitative control valve 300 is supplied with the air pressure of each of the first and second pressure pipes 334 and 335 according to the set value of the operator so that the first moving disk 340 is moved, When the opening and closing holes 314 are opened by opening and closing the opening and closing holes 314 of the first moving disk 340, liquid silicone rubber having a predetermined value (a fixed amount) .

The liquid silicone rubber supplied to the screw chamber part 400 is supplied to the quantitative spraying part 500 after removing air, air, etc. in the liquid silicone rubber.

The liquid silicone rubber supplied to the quantitative spraying unit 500 is supplied with the air pressure of each of the third and fourth pressure pipes 524 and 525 according to the set value of the operator so that the second moving disk 530 is moved When the spouting shaft 531 of the second moving disk 530 opens and closes the spouting flow path 513 and the spouting flow path 513 is opened, the liquid silicone rubber of the set value (fixed amount) And is ejected to the mold section (60) through the ejection flow path (513).

Optimal embodiments have been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: Injection molding equipment for liquid silicone rubber
100: raw material storage unit
200: Material Manufacturing Department
300: Quantitative control valve
310: first housing 311: input part
312: Discharge part 313:
314: opening and closing ball
320: sealing plate 321: first through hole
330: second housing 331: first housing portion
332: first connection protrusion 333: insertion groove
334: first pressure tube 335: second pressure tube
340: first moving disc 341: dog shaft
342:
400: screw chamber part
500:
510: third housing 511: ejection nozzle member
512: ejection shaft moving groove 513:
520: fourth housing 521: second receiving portion
522: second connecting protrusion 523: first moving ball
524: third pressure tube 525: fourth pressure tube
526: engaging screw member 527: second moving ball
530: second moving disc 531: ejection shaft
532: Third moving ball 533: Spout ball
534: fourth moving ball
600: mold part
700: Rubber ring member

Claims (3)

A raw material storage unit 100 for storing one or more raw materials of a rubber series or a silicone series;
A material producing unit 200 for receiving the raw material from the raw material storing unit 100 and mixing the supplied raw material with at least one coloring agent to produce a liquid silicone rubber;
A quantitative control valve 300 for controlling the discharge amount (discharge amount) of the liquid silicone rubber supplied from the material manufacturing unit 200;
A screw chamber part 400 receiving a liquid silicone rubber discharged from the quantitative control valve 300 and having a screw (not shown) rotated therein;
And a fixed amount ejection part (500) for ejecting the liquid silicone rubber to the mold part (600) by controlling the ejection amount (ejection amount) of the liquid silicone rubber supplied from the screw chamber part (400) Injection molding equipment for silicone rubber (1). The method according to claim 1,
The quantitative control valve (300)
The injection part 311 for injecting the liquid silicone rubber is formed on one side and the discharge part 312 for discharging the liquid silicone rubber is formed on the other side and the injection part 311 and the discharge part 312 A first housing 310 formed of an opening and closing hole 314 extending from the movement passage 313 is formed,
A sealing plate 320 coupled to the first housing 310 and having a first through hole 321 formed therein,
A first receiving portion 331 formed in a space on the inside and an insertion groove 333 formed on an inner rear surface of the first receiving portion 331, A second housing 330 having first and second pressure pipes 334 and 335 spaced apart from each other is formed on one side of the first housing 330,
The first and second pressure pipes 334 and 335 are installed in the first accommodating portion 331 and are moved in the forward and backward directions according to the air pressure provided to the first and second pressure pipes 334 and 335, An opening and closing shaft 341 for opening and closing the opening and closing hole 314 is formed and a first moving disc 340 is formed on the inner side to form an insertion portion 342 to be inserted into the insertion groove 333 Injection molding equipment for liquid silicone rubber (1). The method according to claim 2,
The quantitative spraying unit (500)
And a third housing (not shown) including an ejection nozzle member 511 having an ejection shaft moving groove 512 having a long axis and a jetting channel 513 for ejecting the liquid silicone rubber, 510)
A second receiving portion 521 is formed on the inner side and a first moving hole 523 is formed on the inner side rear side of the second receiving portion 521. The first receiving hole 521 is connected to the third housing 510, The second and third connecting protrusions 522 and 523 are formed on the first and second connecting protrusions 522 and 523, respectively. The first and second connecting protrusions 522 and 523 are connected to the first and second moving holes 523 and 523, respectively. And a coupling screw member 526 on which the second moving hole 527 is formed,
And is moved in the forward and backward directions according to the air pressure provided to the third and fourth pressure pipes 524 and 525 and inserted into the ejection shaft moving groove 512 at the front surface thereof, A third moving hole 532 connected to the first moving hole 523 is formed inside the first moving hole 523 and an ejection shaft 531 made of an ejection hole 533 connected to the third moving hole 532 is formed on a front surface of the third moving hole 532, And a second moving disc 530 having a fourth moving hole 534 extending from the third moving hole 532 and connected to the first moving hole 523 is formed on the inner side Injection molding equipment for liquid silicone rubber, characterized by (1).

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