KR200207632Y1 - Gas counter-current prevention apparatus for gas injection molding machine - Google Patents
Gas counter-current prevention apparatus for gas injection molding machine Download PDFInfo
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- KR200207632Y1 KR200207632Y1 KR2020000011899U KR20000011899U KR200207632Y1 KR 200207632 Y1 KR200207632 Y1 KR 200207632Y1 KR 2020000011899 U KR2020000011899 U KR 2020000011899U KR 20000011899 U KR20000011899 U KR 20000011899U KR 200207632 Y1 KR200207632 Y1 KR 200207632Y1
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- Prior art keywords
- gas
- passage
- valve seat
- injection molding
- molding machine
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 26
- 230000002265 prevention Effects 0.000 title claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 230000008878 coupling Effects 0.000 claims abstract description 14
- 238000010168 coupling process Methods 0.000 claims abstract description 14
- 238000005859 coupling reaction Methods 0.000 claims abstract description 14
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 7
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 5
- 239000000057 synthetic resin Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 70
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 229920005992 thermoplastic resin Polymers 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/57—Exerting after-pressure on the moulding material
- B29C45/572—Exerting after-pressure on the moulding material using movable mould wall or runner parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
- B29C45/281—Drive means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
- B29C2045/2882—Closure devices therefor consisting of needle valve systems closing by a movement in the counterflow direction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/57—Exerting after-pressure on the moulding material
- B29C45/572—Exerting after-pressure on the moulding material using movable mould wall or runner parts
- B29C2045/575—Exerting after-pressure on the moulding material using movable mould wall or runner parts preventing backflow of moulding material to the injection means during after-pressure
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
본 고안은 비교적 평판체형상으로 이루어지는 합성수지제 사출물의 비틀림현상 또는 수축현상 방지를 위해 제품의 가장자리로 가스를 이용해 중공의 보강홀을 성형하는 가스사출성형공정시, 주입되는 가스의 역류방지장치를 제공함에 의해 달성되게 되는데, 이 역류방지장치는 노즐을 분리해낸 상기 사출실린더의 타측 단부와 착탈가능하게 나사조립식으로 결합되게 하는 제1나사결합부와, 노즐이 나사결합되는 제2나사결합부가 전후측에 형성되며, 이들 제1 및 제2나사결합부의 사이에는 원료의 공급로를 제공하는 통로를 갖추어서된 밸브본체; 및 상기 밸브본체의 통로상에 설치되어서 원료의 공급압과 가스압에 의해 밀려나는 볼을 이용해 일방향성 흐름이 제어되도록한 차폐수단을 포함하여서, 상기 밸브본체의 상기 차폐수단이 원료의 주입시 상기 통로를 개로하고 가스의 주입시에서는 원료가 주입되는 상기 통로를 차단하여 가스가 사출실린더측으로 역류되는 것을 방지하도록한 가스사출성형기의 가스역류방지장치이다.The present invention provides a device for preventing backflow of injected gas during a gas injection molding process in which a hollow reinforcing hole is formed using gas at the edge of a product to prevent torsion or shrinkage of a synthetic resin injection molded product having a relatively flat plate shape. The reverse flow prevention device includes a first screw engaging portion detachably screwed to the other end of the injection cylinder from which the nozzle is separated, and a second screw engaging portion to which the nozzle is screwed. A valve body formed in the valve body and having a passage providing a supply path of raw materials between the first and second screw coupling portions; And a shielding means installed on a passage of the valve body to control a unidirectional flow by using a ball pushed out by a supply pressure and a gas pressure of the raw material. The gas backflow preventing device of the gas injection molding machine is opened so that when the gas is injected, the passage in which the raw material is injected is blocked to prevent the gas from flowing back to the injection cylinder side.
Description
본 고안은 평판체형상으로 이루어지는 합성수지제의 사출물, 예를 들어 모니터의 프론트패널과 같은 비교적 평면적으로 사출성형되는 제품의 비틀림현상 또는 수축현상 방지를 위해 제품의 가장자리로 가스를 이용해 중공의 보강홀을 성형하는 사출성형공정시, 주입되는 가스의 역류방지에 관한 것으로, 특히 구조가 간단하고, 주입되는 가스압에 의해 자동적으로 개폐되도록한 가스사출성형기의 가스 역류방지장치에 관한 것이다.The present invention provides a hollow reinforcing hole using gas at the edge of the product to prevent torsion or shrinkage of a relatively flat injection molded product, for example, a relatively flat injection molded product such as a front panel of a monitor. In the injection molding process of molding, the present invention relates to the prevention of backflow of injected gas, and more particularly, to a gas backflow prevention device of a gas injection molding machine which has a simple structure and is automatically opened and closed by the injected gas pressure.
사출성형기는 일반적으로 열가소성 수지의 원료를 호퍼를 통해 사출실린더로 투입시키고, 이렇게 투입된 원료는 가열한 사출실린더내에서 융화되면서 리드스크루에 의해 유동화하여 이것을 노즐을 통해 금형내에 강제적으로 압입하여 목적하는 제품을 사출성형하게 된다.Injection molding machine generally inputs the raw material of the thermoplastic resin into the injection cylinder through the hopper, and the injected raw material is fluidized by the lead screw while being melted in the heated injection cylinder and forcibly pressed into the mold through the nozzle to the desired product. Injection molding.
이러한 사출성형공정에서 평판체형상의 제품의 비틀림 방지를 위해 그 제품의 가장자리로 중공의 보강홀을 성형하는 것을 보면, 가스사출성형으로서, 그러한 가스성형사출은 사출실린더의 노즐 인접한 위치에 질소가스 주입을 위한 별도의 가스노즐을 설치하여 원료를 주입후 그 원료의 주입경로상으로 질소가스를 주입하여서 사출 제품의 가장자리로 중공의 보강홀을 성형하게 되는데, 이때 질소가스의 주입시 압력이 사출실린더내에 작용하여 원료들이 사출실린더 후방측으로 밀려나아가는 현상이 일어나, 이것을 방지하기 위해 사출실린더 적당한 위치에 필연적으로 가스역류방지 구조를 갖추고 있다.In the injection molding process, the hollow reinforcing hole is formed at the edge of the product in order to prevent the twisting of the plate-shaped product. As the gas injection molding, such a gas injection molding is performed by injecting nitrogen gas into a position adjacent to the nozzle of the injection cylinder. After the injection of raw materials by installing a separate gas nozzle for injection, nitrogen gas is injected into the injection path of the raw material to form a hollow reinforcement hole at the edge of the injection product. As a result, raw materials are pushed to the rear side of the injection cylinder, and thus, a gas backflow prevention structure is necessarily provided at a proper position of the injection cylinder to prevent this.
그러한 가스역류방지장치는 통상 유압모터를 이용한 로터리밸브타입의 개폐구조로서, 원료의 주입시 가스역류방지장치는 경로를 개로시키고 원료의 주입이 완료되면 가스역류방지장치는 차단되어 가스의 역류를 방지하게 되는데, 이러한 가스역류방지장치는 그 부피가 사출성형기에 비례에 하여 불필요하게 크고, 더욱이 가 가스역류방지장치는 사출성형기에 교체식으로 설치되는 것으로, 그 교체작업에 많은 불편을 주어 관리성이 저조하고, 또한 제조단가가 고가이어 비경제적인 문제점이 있었을 뿐 아니라, 유압모터에서 유류의 배출이 발생하여 제품의 신뢰성을 떨어뜨리고 있으며, 가스의 차폐성이 저조하여 주입되는 원료내로 가스가 역류되고, 이러한 가스 역류는 사출제품에 기포발생 또는 미성형이나, 수축현상등으로 불량품을 발생시키는 주요인이 되고 있는 것이다.Such a gas backflow prevention device is a rotary valve type opening and closing structure using a hydraulic motor, in which the gas backflow prevention device opens the path when the raw material is injected and the gas backflow preventing device is blocked to prevent the backflow of the gas when the raw material injection is completed. The gas backflow prevention device is unnecessarily large in volume in proportion to the injection molding machine, and furthermore, the gas backflow preventing device is installed in the injection molding machine in a replaceable manner, giving a lot of inconvenience to the replacement work and maintaining the manageability. In addition to the low cost and high manufacturing cost, not only was there an uneconomic problem, but also the discharge of oil from the hydraulic motor, which lowered the reliability of the product, and the gas was flowed back into the injected raw material due to the poor shielding of the gas. Gas backflow can cause defective products due to bubbles or unmolding or shrinkage in the injection molded products. It is becoming the main person.
본 고안은 상기와 같은 사정을 고려하여 이루어진 것으로, 그 목적은 가스압에 의해 작용하는 볼을 이용해 일방향성 체크밸브식으로 작동하는 역류방지구조를 갖추므로서, 가스의 역류를 완전히 방지하여 기포현상등으로 인한 제품의 불량을 완전히 방지시킬 수 있는 가스사출성형기의 역류방지장치를 제공하는 것이다.The present invention has been made in consideration of the above circumstances, and its purpose is to provide a backflow prevention structure that operates by a one-way check valve type using a ball acting by gas pressure, thereby completely preventing backflow of gas and causing bubbles. It is to provide a backflow prevention device of the gas injection molding machine that can completely prevent the product defects caused by the.
본 고안의 다른 목적은 가스 역류방지장치의 구조를 간단히 하여 부피를 최소로 줄이고, 그 장치의 교체작업이 간편 용이한 가스사출성형기의 가스역류방지장치를 제공함에 있다.Another object of the present invention is to provide a gas backflow prevention device of a gas injection molding machine by simplifying the structure of the gas backflow prevention device to reduce the volume to a minimum and to easily replace the device.
이러한 본 고안의 목적은 비교적 평판체형상으로 이루어지는 합성수지제 사출물의 비틀림현상 방지를 위해 제품의 가장자리로 가스를 이용해 중공의 보강홀을 성형하는 가스사출성형공정시, 주입되는 가스의 역류방지장치를 제공함에 의해 달성되게 되는데, 이 역류방지장치는 노즐을 분리해낸 상기 사출실린더의 타측 단부와 착탈가능하게 나사조립식으로 결합되게 하는 제1나사결합부와, 노즐이 나사결합되는 제2나사결합부가 전후측에 형성되며, 이들 제1 및 제2나사결합부의 사이에는 원료의 공급로를 제공하는 통로를 갖추어서된 밸브본체; 및 상기 밸브본체의 통로상에 설치되어서 원료의 공급압과 가스압에 의해 밀려나는 볼을 이용해 일방향성 흐름이 제어되도록한 차폐수단을 포함하여서, 상기 밸브본체의 상기 차폐수단이 원료의 주입시 상기 통로를 개로하고 가스의 주입시에서는 원료가 주입되는 상기 통로를 차단하여 가스가 사출실린더측으로 역류되는 것을 방지하도록한 가스사출성형기의 가스역류방지장치이다.The object of the present invention is to provide a backflow preventing device for injecting gas during a gas injection molding process in which a hollow reinforcing hole is formed by using a gas at the edge of a product to prevent torsion of a synthetic resin injection molded product having a relatively flat plate shape. The reverse flow prevention device includes a first screw engaging portion detachably screwed to the other end of the injection cylinder from which the nozzle is separated, and a second screw engaging portion to which the nozzle is screwed. A valve body formed in the valve body and having a passage providing a supply path of raw materials between the first and second screw coupling portions; And a shielding means installed on a passage of the valve body to control a unidirectional flow by using a ball pushed out by a supply pressure and a gas pressure of the raw material. The gas backflow preventing device of the gas injection molding machine is opened so that when the gas is injected, the passage in which the raw material is injected is blocked to prevent the gas from flowing back to the injection cylinder side.
도 1은 일반적인 가스사출성형기의 구조를 보인 개략 단면도,1 is a schematic cross-sectional view showing the structure of a general gas injection molding machine,
도 2는 본 고안 가스사출성형기에 적용되는 가스역류방지장치의 구성을 보여주는 요부확대 단면도,Figure 2 is an enlarged cross-sectional view showing the main part showing the configuration of the gas backflow prevention device applied to the gas injection molding machine of the present invention,
도 3은 본 고안 가스역류방지장치의 다른 실시예를 보여 주는 설명도.3 is an explanatory view showing another embodiment of the present invention gas backflow prevention device.
* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings
10 : 호퍼 20 : 밸브본체10: hopper 20: valve body
21 : 통로 22 : 제1나사결합부21: passage 22: first screw coupling portion
24 : 제2나사결합부 25 : 차폐수단24: second screw coupling portion 25: shielding means
26 : 제1밸브시트 27 : 제2밸브시트26: first valve seat 27: second valve seat
29 : 볼 30 : 가스주입본체29 ball 30 gas injection main body
다음 본 고안의 일실시예에 관해 설명하겠다. 도 1에는 본 고안에 따른 사출성형기가 상세히 도시되어 있는데, 이 사출성형기는 일반적인 것으로, 열가소성수지의 원료가 일측의 호퍼(10)를 통하여 투입되어 가열한 사출실린더(12)의 리드스크루(14)에 의해 유동화하여 이것을 사출실린더(12) 타측의 노즐(16)을 통하여 금형(18)내에 강제적으로 밀어넣어 소정의 합성수지 제품을 사출성형하게 된다. 본 고안은 이러한 사출성형기에서 비교적 평판체형상의 합성수지 제품에서 그 제품의비틀림 방지를 위해 제품의 가장자리에 보강홀을 갖추기 위한 가스사출시 가스가 사출실린더측으로 역류되는 현상을 방지하기 위한 역류방지구조에 관한 것으로, 본 고안에서 특징적인 구성은 장치의 구성을 간소화하고 간단히 교체사용할 수 있게 한것이다.Next will be described an embodiment of the present invention. Figure 1 is shown in detail an injection molding machine according to the present invention, this injection molding machine is a general, the lead screw 14 of the injection cylinder 12, the raw material of the thermoplastic resin is introduced through the hopper 10 on one side and heated. It is made to fluidize, and it is forcibly pushed into the metal mold | die 18 through the nozzle 16 of the other side of the injection cylinder 12, and injection molding a predetermined | prescribed synthetic resin product. The present invention relates to a backflow prevention structure for preventing a phenomenon in which gas flows back to the injection cylinder side when gas injection is provided with a reinforcing hole at the edge of the product to prevent distortion of the product in a relatively flat plate-shaped synthetic resin product in such an injection molding machine In the present invention, the characteristic configuration is to simplify the configuration of the device and to simply replace.
본 고안 가스역류방지장치는 사출실린더(12)의 노즐(16)을 분리해낸 위치에 나사결합식으로 간단히 설치되는데, 이 가스역류방지장치는 크게 나누어서 밸브본체(20)와 가스주입본체(30)로 구성된다.The gas backflow prevention device of the present invention is simply installed by screwing in a position where the nozzle 16 of the injection cylinder 12 is separated. The gas backflow prevention device is divided into a valve body 20 and a gas injection body 30. It consists of.
밸브본체(20)는 대략 원봉형상을 갖는 몸체의 양측에 제1나사결합부(22)와 제2나사결합부(24)를 각기 구비하여서, 제1나사결합부(22)는 사출실린더(12)의 노즐(16)이 분리된 부분(12a)과 나사결합을 이루게 되며, 제2나사결합부(24)는 이후에 설명할 가스주입본체(30)가 나사결합을 이루게 된다. 이와같이 본 고안은 사출실린더에 간단한 나사조립식으로 결합,분리되게 하여서 교체성이 우수한 효과가 있는 것으로, 이를 더 구체적으로 설명하면, 밸브본체(20)의 중심부 즉, 제1 및 제2나사결합부(22)(24) 사이에 걸쳐 사출실린더(12)측과 연결되어 리드스크루(14)에 의해 강제적으로 이송되는 원료를 받아드리어 통과시키는 통로(21)를 형성하고, 이 통로(21)내에 2개1조식으로 구성되는 차폐수단(25)을 설치하여 가스의 역류를 방지하게 된다.The valve body 20 is provided with a first screw coupling portion 22 and a second screw coupling portion 24 on both sides of the body having a substantially circular rod shape, so that the first screw coupling portion 22 is an injection cylinder 12 The nozzle 16 of the) is screwed with the separated portion (12a), the second screw coupling portion 24 is the gas injection body 30 to be described later will be screwed. As such, the present invention has an excellent effect of replaceability by allowing the injection cylinder to be coupled and separated by a simple screw assembly. More specifically, the center of the valve body 20, that is, the first and second screw coupling portions ( 22 and 24, a passage 21 connected to the injection cylinder 12 side to receive and forcibly feed the raw material forcibly transferred by the lead screw 14 is formed. By installing the shielding means (25) consisting of a set of one to prevent the back flow of gas.
도 2는 차폐수단(25)을 보이고 있는데, 이 차폐수단(25)는 제1밸브시트(26)과 제2밸브시트(27)로 구성되는데, 제1밸브시트(26)는 중앙부에 밸브본체(20)의 통로(21)와 연결되는 연결로(26a)를 갖으며, 제2밸브시트(27)는 제1밸브시트(26)의 연결로(26a)와 연결되는 수조의 분기로(27a)가 구성되어 있다. 이때 분기로(27a)는 제2밸브시트(27)내에 방사상으로 형성되는데, 이 분기로(27a)는 제2밸브시트(27)의 내주벽을 파내어 형성하고 이들 분기로(27a)의 중심부에는 쳄버(28)를 갖추어서 볼(29)이 쳄버(28)내에서 자유로이 유동되게 하였다. 여기서 쳄버(28)의 끝단에는 볼(29)이 제2밸브시트(27) 외측으로 나아가지 못하도록하는 돌조(28a)가 설치되어 있다. 이렇게 구성되는 차폐수단(25)은 원료의 주입시에는 그 원료의 이송압에 의해서 볼(29)이 제1밸브시트(26) 연결로(26a)의 단부로부터 이탈되어 제2밸브시트(27)의 돌조(28a)측으로 이동하여 원료가 제1밸브시트(26)의 연결로(26a)와 제2밸브시트(27)의 분기로(27a)를 거쳐 공급을 이루게 될 것이다.Figure 2 shows a shielding means 25, which comprises a first valve seat 26 and a second valve seat 27, the first valve seat 26 is the valve body in the center It has a connection path 26a connected to the passage 21 of the 20, and the second valve seat 27 is a branch passage 27a of the tank connected to the connection path 26a of the first valve seat 26. ) Is configured. At this time, the branch passage 27a is radially formed in the second valve seat 27, and the branch passage 27a is formed by digging out the inner circumferential wall of the second valve seat 27, and in the center of the branch passage 27a. A chamber 28 was provided to allow the ball 29 to flow freely in the chamber 28. At this end of the chamber 28, a projection 28a is provided to prevent the ball 29 from advancing to the outside of the second valve seat 27. In the shielding means 25 configured as described above, when the raw material is injected, the ball 29 is separated from the end of the first valve seat 26 connection path 26a by the transfer pressure of the raw material so that the second valve seat 27 is provided. The raw material will be supplied through the connecting passage 26a of the first valve seat 26 and the branch passage 27a of the second valve seat 27 to move toward the protrusion 28a of the second valve seat 26.
그리고 밸브본체(20)의 제2나사결합부(24)에는 가스주입본체(30)가 나사결합식으로 결합되는데, 이 가스주입본체(30)는 중심부에 밸브본체(20)의 원료이송경로와 연결되는 통로(32)가 형성되어 있으며, 통로(32)의 끝단에는 노즐(16)이 나사결합되는 나사결합부(34)를 갖추고 있다. 그리고 가스주입본체(30)의 외주벽 적당한 위치에 원료의 이송경로상으로 가스주입을 위한 가스주입노즐(36)이 소정의 경사각을 가지고 설치되어 있다. 여기서 가스주입노즐(36)을 통하여 가스를 원료 이송경로상으로 주입시키면 그 가스압에 의해서 차폐수단(25)의 볼(29)이 우측으로 밀려나아가서 제1밸브시트(26)의 연결로(26a)를 가로막아 가스가 사출실린더(12)측으로 역류되는 것을 방지하게 된다.The gas injection main body 30 is screw-coupled to the second screw coupling part 24 of the valve main body 20, and the gas injection main body 30 has a raw material transfer path of the valve main body 20 at the center thereof. A passage 32 to be connected is formed, and at the end of the passage 32, a screw coupling portion 34 into which the nozzle 16 is screwed is provided. And the gas injection nozzle 36 for gas injection is provided in the suitable position on the outer peripheral wall of the gas injection body 30 for predetermined gas inclination angle. Here, when gas is injected into the raw material feed path through the gas injection nozzle 36, the ball 29 of the shielding means 25 is pushed to the right by the gas pressure, and the connection path 26a of the first valve seat 26 is provided. This prevents the gas from flowing back to the injection cylinder 12 side.
도 3에는 본 고안 차폐수단(25)의 제2밸브시트(27) 다른실시예를 보여 주는 것으로, 본 실시예에서는 제2밸브시트(27)의 출구측에 그 출구측으로 가며 점차적으로 좁아지는 테이퍼면(27b)을 구비하여서 원료의 공급시 볼(29)이 제2밸브시트(27)의 출구측 중앙부에 위치되도록하였다. 이러한 볼(29)의 위치 유도는 가스압이 작용시 그 가스압이 편중되지 않고 볼(29)의 중심부에 전달되게 하여서 볼(29)의 작용시 치우침을 예방하고 제1밸브시트(27)의 연결로(27a)를 안정되고 정확히 폐로하는 효과를 얻는다.3 shows another embodiment of the second valve seat 27 of the shielding means 25 of the present invention. In this embodiment, the taper gradually narrows toward the outlet side of the second valve seat 27. The surface 27b was provided so that the ball 29 was positioned at the center of the outlet side of the second valve seat 27 when the raw material was supplied. The induction of the position of the ball 29 causes the gas pressure to be transmitted to the center of the ball 29 without being biased when the gas pressure is applied, thereby preventing bias during the action of the ball 29 and connecting the first valve seat 27. The effect of stable and accurate closing of (27a) is obtained.
그러면 본 고안의 효과에 관해 설명하겠다. 본 고안 가스역류방지장치는 사출실린더의 노즐을 분리해낸 부분에 간단한 구성으로 이루어지는 밸브본체와 가스주입본체를 간단한 나사조립을 이용해 연속적으로 연결하여 목적하는 가스의 역류를 방지케 함으로서, 그 가스역류방지장치의 설치 및 해체작업이 간편 용이하고 따라서 교체성이 우수하여 사출성형작업성을 향상시키는 것이다.Then, the effect of the present invention will be described. The gas backflow prevention device of the present invention prevents the backflow of the desired gas by continuously connecting the valve body and the gas injection main body having a simple configuration to the part where the nozzle of the injection cylinder is separated by simple screw assembly, thereby preventing the backflow of the desired gas. The installation and dismantling of the device is simple and therefore easy to replace, thus improving injection molding workability.
또 본 고안은 가스의 역류를 완전히 방지하여 기포현상등으로 인한 제품의 불량률을 최소로 줄이고 제품성을 높이는 이점도 있다.In addition, the present invention has the advantage of completely preventing the reverse flow of gas to minimize the defect rate of the product due to the bubble phenomenon and to improve the productability.
이상에서와 같이 본 고안의 일실시예에 관해 설명하였으나, 본 고안은 이에 국한되지 않고 청구범위에 기재된 범위내에서 변경이 가능할 것이다.As described above, an embodiment of the present invention has been described, but the present invention is not limited thereto and may be changed within the scope of the claims.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2020000011899U KR200207632Y1 (en) | 2000-03-31 | 2000-04-26 | Gas counter-current prevention apparatus for gas injection molding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020000016984A KR20010094600A (en) | 2000-03-31 | 2000-03-31 | Gas counter-current prevention apparatus for gas injection molding machine |
| KR2020000011899U KR200207632Y1 (en) | 2000-03-31 | 2000-04-26 | Gas counter-current prevention apparatus for gas injection molding machine |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020000016984A Division KR20010094600A (en) | 2000-03-31 | 2000-03-31 | Gas counter-current prevention apparatus for gas injection molding machine |
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| KR200207632Y1 true KR200207632Y1 (en) | 2000-12-15 |
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| KR2020000011899U KR200207632Y1 (en) | 2000-03-31 | 2000-04-26 | Gas counter-current prevention apparatus for gas injection molding machine |
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| KR (1) | KR200207632Y1 (en) |
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