JPH081060Y2 - High pressure gas injection valve for molding machine - Google Patents
High pressure gas injection valve for molding machineInfo
- Publication number
- JPH081060Y2 JPH081060Y2 JP1990055679U JP5567990U JPH081060Y2 JP H081060 Y2 JPH081060 Y2 JP H081060Y2 JP 1990055679 U JP1990055679 U JP 1990055679U JP 5567990 U JP5567990 U JP 5567990U JP H081060 Y2 JPH081060 Y2 JP H081060Y2
- Authority
- JP
- Japan
- Prior art keywords
- poppet
- pressure gas
- opening
- seat surface
- taper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） 本考案は高圧ガス注入部に逆止弁を有する射出成形機
の高圧ガス圧入バルブに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a high pressure gas injection valve of an injection molding machine having a check valve in a high pressure gas injection part.
（従来の技術） 第３図は従来の射出成形機用高圧ガス圧入バルブを示
すもので、バルブボディ1aとノズル１は射出装置３に組
付けられている。そして溶融樹脂は通路４を通って射出
装置３からノズル１の方に押し出され、ノズル１から図
示しない金型キャビティ内に射出される。この時プラン
ジャ11は、レバー６によりノズル１と反対方向に押され
ることにより、ノズルシール部が開口し、溶融樹脂の通
路が出来る。(Prior Art) FIG. 3 shows a conventional high-pressure gas injection valve for an injection molding machine, in which a valve body 1a and a nozzle 1 are assembled in an injection device 3. Then, the molten resin is extruded from the injection device 3 toward the nozzle 1 through the passage 4, and is injected from the nozzle 1 into the mold cavity (not shown). At this time, the plunger 11 is pushed in the direction opposite to the nozzle 1 by the lever 6, so that the nozzle seal portion opens and a molten resin passage is formed.
またプランジャ11内には第４図に示す様にガス通路14
が設けられ、その先端部に逆止部10が設けられている。
第３図の高圧ガス入口７と、プランジャ11のガスの通路
14は連通となっている。高圧ガスを圧入するときは、高
圧ガスは入口７から送り込まれ、プランジャ11内のガス
通路14を通って逆止部10の球体16を開き、図示しない金
型内に圧入される。高圧ガス圧入時以外の時は溶融樹脂
が通路14内に球体16を介して逆流するのを防止するた
め、逆止部は閉となる。Further, as shown in FIG.
Is provided, and the check portion 10 is provided at the tip thereof.
High pressure gas inlet 7 of FIG. 3 and gas passage of plunger 11
14 is open. When pressurizing the high-pressure gas, the high-pressure gas is sent from the inlet 7, passes through the gas passage 14 in the plunger 11, opens the sphere 16 of the check portion 10, and is press-fitted in a mold (not shown). The non-return portion is closed in order to prevent the molten resin from flowing back into the passage 14 via the sphere 16 except when the high-pressure gas is being injected.
従来の逆止部10は、第４図に示すようにプランジャ11
の開口部に角度θのテーパ座面11aを設け、そこに球体1
6を置き、この球体16が小ストロークＳを前後してテー
パ座面11aに接した時は通路を閉として溶融樹脂の逆流
を防止する方式であった。The conventional non-return portion 10 has a plunger 11 as shown in FIG.
A taper seat surface 11a with an angle of θ is provided at the opening of the sphere 1
When 6 is placed and this sphere 16 comes in contact with the taper seat surface 11a after moving back and forth in a small stroke S, the passage is closed to prevent the reverse flow of the molten resin.
（考案が解決しようとする課題） 前記従来の球体16を設けた方式では、水や作動油の様
に粘度が低目の流体に対しては、逆流時に球体16がテー
パ座面11aの中心に座り、球体16とテーパ座面11aの接触
が全周にわたって隙間なく出来、通路が閉じられる。し
かし溶融樹脂の様な粘度が高めの流体に対しては、球体
16が高粘度流体によって横方向に押付けられ、テーパ座
面11aの中心から偏心した位置で止まる。また球体がテ
ーパ座面11aに対して偏心しているとテーパ座面11aとの
間に隙間が出来て流体が逆流する欠点があった。更に球
体16はテーパ座面11aと線接触をしているため、充分な
シール面が構成できない欠点があった。(Problems to be Solved by the Invention) In the system in which the conventional spherical body 16 is provided, the spherical body 16 is located at the center of the taper seat surface 11a at the time of reverse flow for a fluid having a low viscosity such as water or hydraulic oil. Sitting, the spherical body 16 and the tapered seating surface 11a can be contacted with each other without a gap, and the passage is closed. However, for fluids with high viscosity such as molten resin, spheres
16 is laterally pressed by the high-viscosity fluid and stops at a position eccentric from the center of the tapered seat surface 11a. If the sphere is eccentric with respect to the taper seat surface 11a, a gap is created between the sphere and the taper seat surface 11a, and the fluid flows backward. Further, since the spherical body 16 is in line contact with the tapered seat surface 11a, there is a drawback that a sufficient sealing surface cannot be formed.
本考案は弁体とテーパ座面を面接触させ、逆止部のシ
ール面を大きくすることにより、前記従来の課題を解決
しようとするものである。The present invention is intended to solve the above-mentioned conventional problems by making the valve body and the tapered seat surface in surface contact with each other and enlarging the seal surface of the check portion.
（課題を解決するための手段） このため本考案は、成形用ノズルの射出口にプランジ
ャの先端が当接してノズルシール部を形成すると共に、
前記プランジャ内のガス通路と開口部との間にポペット
を有し、前記成形用ノズルに続く型キャビティに高圧ガ
スを圧入する高圧ガス圧入バルブにおいて、プランジャ
内のガスの通路に設けた前記ポペットにテーパ部を設
け、前記開口部にテーパ座面を設けると共に、前記ポペ
ットのテーパ部の軸心と、開口部のテーパ座面の軸心と
が一致するようにして、ポペットのテーパ部と開口部の
テーパ座面とが大きな面シール構造をなすようにし、か
つポペットの外周を面取りして開口部の内壁との間に高
圧ガスの通路を構成してなるもので、これを課題解決の
ための手段とするものである。(Means for Solving the Problem) Therefore, in the present invention, the tip of the plunger abuts the injection port of the molding nozzle to form the nozzle seal portion, and
In a high-pressure gas injection valve that has a poppet between the gas passage and the opening in the plunger and pressurizes high-pressure gas into a mold cavity following the molding nozzle, the poppet provided in the gas passage in the plunger A taper portion is provided, a taper seat surface is provided in the opening, and the axis of the taper portion of the poppet and the axis of the taper seat surface of the opening are aligned so that the taper portion of the poppet and the opening portion To form a large face seal structure with the taper seat surface and to chamfer the outer periphery of the poppet to form a high-pressure gas passage between the inner wall of the opening and this. It is a means.
（作用） ポペットと開口部内面の軸心が一致し、また開口部と
テーパ座面の軸心も一致しているから、ポペットとテー
パ座面の軸心は一致し、テーパ座面に対するポペットの
偏心がなくなる。弁体と開口部内壁に設けた半月形通路
を高圧ガスが通ることができ、ポペットのテーパ部とテ
ーパ座面が面接触するから、大きなシール面をもった逆
止部が構成される。(Operation) Since the axis of the poppet and the inner surface of the opening match, and the axis of the opening and the tapered seat surface also match, the axis of the poppet and the tapered seat surface match, and Eccentricity disappears. High-pressure gas can pass through the valve body and the half-moon shaped passage provided on the inner wall of the opening, and the taper portion of the poppet and the taper seat surface make surface contact, so that a check portion having a large sealing surface is formed.
（実施例） 以下本考案を図面の実施例について説明すると、第１
図は本考案の実施例を示す。なお、第１図における射出
装置及び高圧ガス圧入ノズルについては、第３図に示す
従来技術と同じであり、第４図の従来の機構に対応して
示してある。(Embodiment) The present invention will be described below with reference to embodiments of the drawings.
The figure shows an embodiment of the invention. The injection device and the high-pressure gas injection nozzle shown in FIG. 1 are the same as those in the prior art shown in FIG. 3, and are shown corresponding to the conventional mechanism shown in FIG.
さて第１図において、プランジャ11の開口部15にその
内面に沿って摺動する摺動面13をもったポペット（逆止
弁）12が挿入されている。ポペット12の摺動面13の外径
と開口部15の内径との間には摺動に必要最小限の隙間が
あり、また開口部15のガス通路14側には角度θのテーパ
座面11aがあり、このテーパ座面11aはポペット12のテー
パ部12aと同一角度にしてある。ポペット12がテーパ座
面11aに押付けられたとき、互いに面接触して大きなシ
ール面をもった逆止部10が構成される。In FIG. 1, a poppet (check valve) 12 having a sliding surface 13 that slides along the inner surface of the plunger 11 is inserted into the opening 15 of the plunger 11. There is a minimum gap required for sliding between the outer diameter of the sliding surface 13 of the poppet 12 and the inner diameter of the opening 15, and the taper seat surface 11a of the opening 15 on the gas passage 14 side has an angle θ. The taper seat surface 11a has the same angle as the taper portion 12a of the poppet 12. When the poppet 12 is pressed against the taper seat surface 11a, the non-return portion 10 having a large sealing surface comes into surface contact with each other.
ポペット12は開口部15内でストロークＳだけ摺動して
テーパ座面11aとの間の隙間を開閉し、高圧ガスを圧入
するときは開とし、溶融樹脂の圧力がガス圧より高い時
はテーパ座面11aにポペット12が押付けられて閉とな
る。第２図の如くポペット12の外周は面取りしてあるの
で、開口部15の内壁との間に半月形の通路17が構成され
ており、ガス圧入時は高圧ガスがこの通路17を通って先
端方向へ流れることが出来る。The poppet 12 slides in the opening 15 for the stroke S to open and close the gap between the poppet 12 and the tapered seating surface 11a, and opens when high-pressure gas is injected, and taper when the molten resin pressure is higher than the gas pressure. The poppet 12 is pressed against the seat surface 11a and is closed. As shown in FIG. 2, since the outer circumference of the poppet 12 is chamfered, a half-moon shaped passage 17 is formed between the poppet 12 and the inner wall of the opening 15. When the gas is injected, the high pressure gas passes through the passage 17 and the tip ends. Can flow in the direction.
（考案の効果） 以上詳細に説明した如く本考案は、プランジャ内のガ
スの通路に設けたポペットのテーパ部の軸心と、ガス通
路の開口部のテーパ座面の軸心とが一致するようにし
て、同テーパ部とテーパ座面とが大きな面シール構造と
構成するようにしたので、ポペットとテーパ座面がしっ
くり密着し、高粘度な溶融樹脂により横に押付けられて
横にずれることがないので、確実に面シールすることが
できる。また前記テーパ部とテーパ座面のシール面が大
きいので、先端部に最高1800kgf/cm2の溶融樹脂圧力が
作用する高圧ガス圧入成形において、ガス通路に溶融樹
脂が逆流するのを防止することができる。また本考案
は、ポペットの外周を面取りして開口部の内壁の間に高
圧ガスの通路を構成し、またポペットは球体のように各
方向にぐるぐる回ることがないため、ポペットに付着し
た溶融樹脂がガス通路に入らなくなり、かつ開口部の内
壁との間に半月形の通路が形成され、ガス圧入時は高圧
ガスがこの通路を通って先端方向へ流れることができ
る。(Effect of the Invention) As described in detail above, in the present invention, the axial center of the tapered portion of the poppet provided in the gas passage in the plunger and the axial center of the tapered seat surface of the opening of the gas passage are aligned. Since the taper portion and the taper seat surface have a large face seal structure, the poppet and the taper seat surface are in close contact with each other, and the high-viscosity molten resin pushes it sideways and shifts it sideways. Since it does not exist, the face seal can be surely performed. Further, since the sealing surface between the tapered portion and the tapered seat surface is large, it is possible to prevent the molten resin from flowing back into the gas passage in the high pressure gas press molding in which the molten resin pressure of up to 1800 kgf / cm 2 acts on the tip portion. it can. In addition, the present invention chamfers the outer circumference of the poppet to form a passage for high-pressure gas between the inner walls of the opening, and since the poppet does not rotate in each direction like a sphere, the molten resin attached to the poppet Does not enter the gas passage, and a half-moon shaped passage is formed between it and the inner wall of the opening. When gas is injected, high pressure gas can flow through this passage in the distal direction.
第１図は本考案の実施例に係る成形機用高圧ガス圧入バ
ルブの側断面図、第２図は第１図のＡ〜Ａ断面図、第３
図は従来の高圧ガス圧入バルブを示す側断面図、第４図
は第３図のＢ部の詳細断面図である。 図の主要部分の説明 １……ノズル ５……射出口 10……逆止部 11……プランジャ 11a……テーパ座面 12……ポペット（逆止弁） 13……逆止部 14……ガス通路 15……開口部1 is a side sectional view of a high pressure gas injection valve for a molding machine according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG.
FIG. 4 is a side sectional view showing a conventional high pressure gas injection valve, and FIG. 4 is a detailed sectional view of a B portion in FIG. Description of main parts of the figure 1 …… Nozzle 5 …… Injection port 10 …… Check part 11 …… Plunger 11a …… Taper seat surface 12 …… Poppet (check valve) 13 …… Check part 14 …… Gas Passage 15 …… Opening
Claims (1)
が当接してノズルシール部を形成すると共に、前記プラ
ンジャ内のガス通路と開口部との間にポペットを有し、
前記成形用ノズルに続く型キャビティに高圧ガスを圧入
する高圧ガス圧入バルブにおいて、プランジャ内のガス
の通路に設けた前記ポペットにテーパ部を設け、前記開
口部にテーパ座面を設けると共に、前記ポペットのテー
パ部の軸心と、開口部のテーパ座面の軸心とが一致する
ようにして、ポペットのテーパ部と開口部のテーパ座面
とが大きな面シール構造をなすようにし、かつポペット
の外周を面取りして開口部の内壁との間に高圧ガスの通
路を構成してなることを特徴とする成形機用高圧ガス圧
入バルブ。1. A nozzle seal portion is formed by contacting a tip of a plunger with an injection port of a molding nozzle, and a poppet is provided between a gas passage and an opening in the plunger.
A high-pressure gas injection valve for injecting high-pressure gas into a mold cavity following the molding nozzle, wherein the poppet provided in the gas passage in the plunger is provided with a taper portion, the opening is provided with a taper seat surface, and the poppet is provided. The taper of the poppet and the taper seat surface of the opening are aligned with each other so that the taper part of the poppet and the taper seat surface of the opening form a large face seal structure, and A high-pressure gas injection valve for a molding machine, characterized in that a high-pressure gas passage is formed between an inner wall of an opening and a chamfered outer periphery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990055679U JPH081060Y2 (en) | 1990-05-28 | 1990-05-28 | High pressure gas injection valve for molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990055679U JPH081060Y2 (en) | 1990-05-28 | 1990-05-28 | High pressure gas injection valve for molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0413316U JPH0413316U (en) | 1992-02-03 |
| JPH081060Y2 true JPH081060Y2 (en) | 1996-01-17 |
Family
ID=31578849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990055679U Expired - Lifetime JPH081060Y2 (en) | 1990-05-28 | 1990-05-28 | High pressure gas injection valve for molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH081060Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51119063A (en) * | 1975-04-11 | 1976-10-19 | Asahi Dow Ltd | Injection molding machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6294022U (en) * | 1985-12-02 | 1987-06-16 |
-
1990
- 1990-05-28 JP JP1990055679U patent/JPH081060Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51119063A (en) * | 1975-04-11 | 1976-10-19 | Asahi Dow Ltd | Injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0413316U (en) | 1992-02-03 |
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