JPH01214420A - Prefill valve with built-in pressure intensifying mechanism for clamping cylinder - Google Patents
Prefill valve with built-in pressure intensifying mechanism for clamping cylinderInfo
- Publication number
- JPH01214420A JPH01214420A JP3891788A JP3891788A JPH01214420A JP H01214420 A JPH01214420 A JP H01214420A JP 3891788 A JP3891788 A JP 3891788A JP 3891788 A JP3891788 A JP 3891788A JP H01214420 A JPH01214420 A JP H01214420A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- piston
- prefill
- cylinder
- clamping cylinder
- 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.)
- Granted
Links
- 239000010720 hydraulic oil Substances 0.000 abstract description 14
- 239000003921 oil Substances 0.000 abstract description 8
- 238000004891 communication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Classifications
-
- 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
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/67—Mould opening, closing or clamping devices hydraulic
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は、合成樹脂材料などの射出成形機における型
締シリンダーのためのプレフィル弁に関するものであり
、特に増圧機構を内蔵したプレフィル弁に係わるもので
ある。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a prefill valve for a mold clamping cylinder in an injection molding machine for synthetic resin materials, and particularly to a prefill valve with a built-in pressure increasing mechanism. It is related.
〈従来技術〉
一般に、合成樹脂材料の射出成形機における型締装置に
おいては、増圧機構を用いて型締シリンダーを駆動して
型締めする方式が多用されている。又、型締装置は高速
での型閉じ工程と高圧での型締め工程とを組み合わせて
作動することが普通であるから、かかる型締装置の型締
シリンダーにあっては、高速型閉じのためにプレフィル
機構を備えて、型閉じ時の型締ピストンの高速移動に応
じて型締シリンダー内に作動油を補填しておくことも行
われている。<Prior Art> Generally, in a mold clamping device for an injection molding machine for synthetic resin materials, a method of driving a mold clamping cylinder using a pressure increasing mechanism to clamp the mold is often used. In addition, since a mold clamping device normally operates by combining a mold closing process at high speed and a mold clamping process at high pressure, the mold clamping cylinder of such a mold clamping device has a high speed mold closing process. A prefill mechanism is also installed in the mold clamping cylinder to replenish hydraulic oil in the mold clamping cylinder according to the high-speed movement of the mold clamping piston when the mold is closed.
しかるところ、従来技術では、上記のプレフィル機構を
もった型締装置において、増圧機構を使用する場合には
、プレフィル弁と増圧シリンダーとを別個に備えてこれ
らを組み合せて使用していた。However, in the prior art, when a pressure increase mechanism is used in a mold clamping device having the above-mentioned prefill mechanism, a prefill valve and a pressure increase cylinder are separately provided and used in combination.
〈発明が解決しようとする問題点〉
上記従来技術においては、プレフィル弁と増圧シリンダ
ーとが別個に装備されるので、構造が複雑になるばかり
か、設備スペースが大きくなるという問題点があり、し
かも、型締のための増圧機構の作動中にプレフィル弁を
確実に閉じておくためのインターロック機構も必要にな
るという問題点もあった。<Problems to be Solved by the Invention> In the above-mentioned conventional technology, since the prefill valve and the pressure increase cylinder are separately installed, there are problems in that the structure is not only complicated, but also the equipment space becomes large. Furthermore, there is a problem in that an interlock mechanism is also required to ensure that the prefill valve is closed while the pressure increase mechanism for mold clamping is in operation.
く問題点を解決するための手段〉
この発明は、上記従来技術に基づく型締シリンダーのた
めのプレフィル弁と増圧機構の構造上の制約による構造
複雑化等の問題点に鑑み、型締シリンダーに連通して増
圧シリンダーを設け、該増圧シリンダー内に増圧ピスト
ンを慴動自在に挿入し、該増圧ピストン内に形成された
中空部にプレフィル弁体を慴動自在に組み込むことによ
り、前記問題点を解決せんとするものである。Means for Solving the Problems> The present invention has been made in view of the problems such as the complicated structure due to the structural constraints of the prefill valve and pressure increase mechanism for the mold clamping cylinder based on the above-mentioned conventional technology. A pressure increase cylinder is provided in communication with the pressure increase cylinder, a pressure increase piston is slidably inserted into the pressure increase cylinder, and a prefill valve body is slidably incorporated into a hollow portion formed in the pressure increase piston. , which attempts to solve the above problems.
く作 用〉
この発明の構成は、高速型閉じのためのプレフィル作業
時には、プレフィル弁体を増圧ピストンから開放して増
圧ピストン中空部を型締シリンダーに連通し、大流量で
の作動油を増圧ピストン中空部から弁開敷部経由で型締
シリンダー内に充填し、型締めのための増圧作動時には
、プレフィル弁体を閉じて型締シリンダーと増圧ピスト
ン中空部間の連通を断ち、増圧ピストン全体をプレフィ
ル弁体とともに型締シリンダー側に押圧して該型締シリ
ンダー内に充填された作動油に高圧を付与するように作
用するものである。Function> The structure of the present invention is that, during prefill work for high-speed mold closing, the prefill valve body is opened from the pressure booster piston, and the hollow part of the pressure booster piston is communicated with the mold clamping cylinder. is filled into the mold clamping cylinder from the hollow part of the pressure booster piston via the valve opening part, and when the pressure increases for mold clamping, the prefill valve body is closed to establish communication between the mold clamping cylinder and the hollow part of the pressure booster piston. The pressurizing piston presses the entire pressure increasing piston together with the prefill valve element toward the mold clamping cylinder, thereby applying high pressure to the hydraulic oil filled in the mold clamping cylinder.
〈実施例〉
次に、この発明の実施例を図に基づいて説明すれば以下
のとおりである。<Example> Next, an example of the present invention will be described below based on the drawings.
第１図において、型締シリンダー１に連通して増圧シリ
ンダー２が付設されており、該増圧シリンダー２内には
、増圧ピストン３が慴動自在に挿入されている。増圧ピ
ストン３内には、中空部４が形成されていて、該中空部
４は窓５及び増圧シリンダー２に穿設されたプレフィル
開口６を経て、図示しないプレフィル用油タンクに連通
している。In FIG. 1, a pressure increase cylinder 2 is attached in communication with a mold clamping cylinder 1, and a pressure increase piston 3 is slidably inserted into the pressure increase cylinder 2. A hollow section 4 is formed in the pressure boosting piston 3, and the hollow section 4 communicates with a prefill oil tank (not shown) through a window 5 and a prefill opening 6 formed in the pressure boosting cylinder 2. There is.
上記増圧ピストン３の中空部４には、プレフィル弁体８
が慴動自在に組み込まれていて、該弁体８は、増圧ピス
トン３の中空部４が型締シリンダー１と連通ずる先端開
口部４ａに形成された弁座９に対して、当接離脱可能に
着座している。プレフィル弁体８の弁杆１０の後端部に
は、ピストン部１１が形成されており、該ピストン部１
１は、増圧ピストン３の後部に形成された弁作動室１２
内に慴動自在に収容されている。そして、該弁作動室１
２のピストン後部側は開口１３及び増圧シリンダー２に
穿設された。側部孔１４経由で、図示しない油圧源に連
通している。前記プレフィル弁体８と増圧ピストン３と
の間の弁杆１０上には、戻しバネ１５が介装されていて
、弁体８を常に弁座９に着座する方向に付勢している。A prefill valve body 8 is provided in the hollow portion 4 of the pressure increase piston 3.
is incorporated in a slidable manner, and the valve body 8 is brought into contact with and released from a valve seat 9 formed in the tip opening 4a through which the hollow portion 4 of the pressure booster piston 3 communicates with the mold clamping cylinder 1. Possibly seated. A piston portion 11 is formed at the rear end of the valve rod 10 of the prefill valve body 8.
1 is a valve operating chamber 12 formed at the rear of the pressure boosting piston 3;
It is housed inside and can move freely. And the valve operating chamber 1
The rear side of the piston 2 was bored into the opening 13 and the pressure boosting cylinder 2. It communicates with a hydraulic power source (not shown) via the side hole 14 . A return spring 15 is interposed on the valve rod 10 between the prefill valve body 8 and the pressure increase piston 3, and always biases the valve body 8 in the direction of seating on the valve seat 9.
又、増圧シリンダー２の端部は蓋体１６によって閉じら
れており、増圧ピストン３の後端との間に増圧作動油室
１７が形成されていて、該増圧作動油室１７は、蓋体１
６に穿設された後部孔１８を介して、図示しない油圧源
に連通されている。The end of the pressure booster cylinder 2 is closed by a lid 16, and a pressure booster hydraulic oil chamber 17 is formed between it and the rear end of the pressure booster piston 3. , lid body 1
6 is connected to a hydraulic power source (not shown) through a rear hole 18 bored in the rear hole 18 .
しかるところ、上記増圧ピストン３の後端の断面積、即
ち、受圧面積は、先端の断面積より大きくなるように形
成されていて、作動時に油テコの作用を奏するようにな
っている。However, the cross-sectional area of the rear end of the pressure boosting piston 3, that is, the pressure receiving area, is formed to be larger than the cross-sectional area of the tip, so that it exerts an oil lever effect during operation.
尚、２０は可動型板で、型締シリンダーｌのピストン２
１のピストンロッド２２に連結されていて、型閉じ乃至
型締め時に上昇するものであり、２４は該可動型板２０
に連結されていて、これを型閉じ時に、高速で上昇させ
るための型閉じブースタである。そして、２３ａは該シ
リンダーｌのピストン上部室２３の空気を外部に逃がす
ための排気孔である。上記構成において、型閉じを行う
ために、型閉じブースタ２４により、可動型板２０と一
体的に型締シリンダー１のピストン２１を高速で上昇さ
せるときは、第２図に示すように、増圧ピストン３の弁
作動室１２に、図示しない油圧源より、側部孔１４及び
開口１３経由で高圧作動油を実線矢印沿いに供給し、ピ
ストン部１１を戻しバネ１５に抗して前進させて、プレ
フィル弁体８を弁座９から離脱させ、中空部４と型締シ
リンダー１とを連通させる。この状態で、型締シリンダ
ー１のピストン２１が高速上昇させられると、図示しな
いプレフィル用油タンクからプレフィル開口６及び窓５
経由で作動油が、実線矢印沿いに増圧ピストン３の中空
部４に流入し、ここから更に、弁体８が開放された先端
開口部４ａを経て型締シリンダー１内に流入して該型締
シリンダーｌ内に作動油が大流量で補填されていくもの
である。In addition, 20 is a movable mold plate, and the piston 2 of the mold clamping cylinder l
It is connected to the piston rod 22 of 1 and rises when closing or clamping the mold, and 24 is connected to the movable mold plate 20.
It is a mold closing booster that is connected to the mold and raises it at high speed when the mold is closed. Further, 23a is an exhaust hole for discharging air in the piston upper chamber 23 of the cylinder l to the outside. In the above configuration, when the piston 21 of the mold clamping cylinder 1 is raised at high speed integrally with the movable mold plate 20 by the mold closing booster 24 in order to close the mold, the pressure is increased as shown in FIG. High-pressure hydraulic oil is supplied to the valve operating chamber 12 of the piston 3 from a hydraulic source (not shown) via the side hole 14 and the opening 13 along the solid line arrow, and the piston part 11 is moved forward against the return spring 15. The prefill valve body 8 is removed from the valve seat 9, and the hollow part 4 and the mold clamping cylinder 1 are communicated with each other. In this state, when the piston 21 of the mold clamping cylinder 1 is raised at high speed, the prefill opening 6 and the window 5 are filled from the prefill oil tank (not shown).
The hydraulic oil flows into the hollow part 4 of the pressure booster piston 3 along the solid line arrow, and from there, it flows into the mold clamping cylinder 1 through the tip opening 4a where the valve body 8 is opened, and the hydraulic oil flows into the mold clamping cylinder 1. Hydraulic oil is replenished into the tightening cylinder l at a large flow rate.
次いで、型締めを行うときには、第３図に示すように、
弁作動油室１２と油圧源との連通を断って該弁作動油室
１２を開放すると、ピストン部１１が戻しバネ１５に付
勢されて後退し、プレフィル弁体８が弁座９に着座して
、これにより、型締シリンダー１と中空部４との連通が
断たれる。そして、図示しない油圧源から後部孔１８経
由で、高圧作動油が増圧作動油室１７に導入されると、
増圧ピストン３全体がプレフィル弁体８ともども前進し
て、プランジャとして作動し、型締シリンダー１のピス
トン２１に高圧を作用させる。このとき、増圧ピストン
３は、後端の受圧面積が前端断面積より大であるので、
油テコ作用が働いて型締シリンダーｌには増圧された高
圧が付与されることになる。Next, when performing mold clamping, as shown in Figure 3,
When the valve operating oil chamber 12 is disconnected from the hydraulic pressure source and the valve operating oil chamber 12 is opened, the piston portion 11 is urged by the return spring 15 and retreats, and the prefill valve body 8 is seated on the valve seat 9. As a result, communication between the mold clamping cylinder 1 and the hollow portion 4 is cut off. Then, when high-pressure hydraulic oil is introduced into the pressure-boosting hydraulic oil chamber 17 from a hydraulic source (not shown) via the rear hole 18,
The pressure increasing piston 3 as a whole moves forward together with the prefill valve body 8, operates as a plunger, and applies high pressure to the piston 21 of the mold clamping cylinder 1. At this time, since the pressure receiving area of the rear end of the pressure increasing piston 3 is larger than the front end cross-sectional area,
Due to the oil lever action, increased high pressure is applied to the mold clamping cylinder l.
なお、この状態から型開きを行うときには、増圧作動油
室１７を油圧源から遮断して開放し、側部孔１４から増
圧シリンダー２内に第２図で実線矢印沿いに作動油を導
入すると、先ず、第２図で点線矢印沿いに作動油圧を受
ｌすで、増圧ピストン３全体が後退して蓋体１Ｂに当接
し、その後、弁作動室１２に流入する作動油によってプ
レフィル弁８が弁座９から離されて、増圧ピストン３の
中空部４の先端開口部が開放される。そして、型締シリ
ンダー１のピストン２１の下降に伴って、該型締シリン
ダー１内の作動油は増圧ピストン３の中空部４を経てプ
レフィル用油タンクに戻されるものである。In addition, when opening the mold from this state, the pressure boosting hydraulic oil chamber 17 is cut off from the hydraulic pressure source and opened, and hydraulic oil is introduced into the pressure boosting cylinder 2 from the side hole 14 along the solid line arrow in Fig. 2. Then, first, the hydraulic pressure is applied along the dotted line arrow in FIG. 8 is separated from the valve seat 9, and the tip opening of the hollow portion 4 of the pressure boosting piston 3 is opened. As the piston 21 of the mold clamping cylinder 1 descends, the hydraulic oil in the mold clamping cylinder 1 is returned to the prefill oil tank through the hollow part 4 of the pressure boosting piston 3.
く効 果〉
上記のようにこの発明によれば、型締シリンダーに連通
して付設された増圧シリンダー内に増圧ピストンを摺動
自在に挿入し、該増圧ピストンに形成された中空部内に
プレフィル弁体を慴動自在に組み込んで、プレフィル作
動時には、プレフィル弁を開放して、作動油を増圧ピス
トンの中空部経由で型締シリンダー内に大流量で補填し
、型締め時には、プレフィル弁を閉じて、増圧ピストン
全体をプレフィル弁ともども前進させて、型締シリンダ
ー内に増圧された高圧を付与するようにしたことにより
、プレフィル機構をもつ型締装置に増圧機構を使用する
場合に従来はプレフィル機構と増圧機構とが別個の装備
であったものを、増圧機構にプレフィル機構を巧みに組
み込んで一体化することができて、装置の複雑化を防ぐ
とともに、取付はスペースを大幅に節約できるという優
れた効果が奏せられる。Effect> As described above, according to the present invention, the pressure increasing piston is slidably inserted into the pressure increasing cylinder attached in communication with the mold clamping cylinder, and the pressure increasing piston is inserted into the hollow part formed in the pressure increasing piston. A prefill valve body is movably incorporated into the holder, and when the prefill is activated, the prefill valve is opened and a large flow of hydraulic oil is replenished into the mold clamping cylinder via the hollow part of the pressure booster piston. By closing the valve and moving the entire pressure increasing piston forward together with the prefill valve to apply increased high pressure inside the mold clamping cylinder, the pressure increasing mechanism can be used in a mold clamping device with a prefill mechanism. In some cases, the prefill mechanism and pressure increase mechanism were previously separate equipment, but the prefill mechanism can be skillfully incorporated into the pressure increase mechanism and integrated, preventing the device from becoming complicated and making installation easier. This has an excellent effect of significantly saving space.
また、型締めのための増圧作動時には、プレフィル弁体
が常に閉じられる方向に作動するので、従来必要とされ
ていたインターロック機構が不要なものとなるという効
果もある。Furthermore, since the prefill valve body always operates in the direction of closing during the pressure increase operation for mold clamping, there is also the effect that the interlock mechanism that was conventionally required is unnecessary.
図はこの発明の実施例を示すものであり、第１図は断面
側面図、第２図及び第３図は作動を表わす作動説明図で
ある。The drawings show an embodiment of the present invention, and FIG. 1 is a sectional side view, and FIGS. 2 and 3 are operation explanatory diagrams showing the operation.
Claims (3)
、該増圧シリンダー２内に慴動自在に挿入された増圧ピ
ストン３と、該増圧ピストン３内に形成された中空部４
内に摺動自在に組み込まれたプレフィル弁体８とから成
り、該プレフィル弁体８は、前記増圧ピストン３の、型
締シリンダー１に連通する先端開口部４ａに形成された
弁座９に対して着座可能であるとともに、該プレフィル
弁体８の弁杆１０の後端部には、前記増圧ピストン３後
部に形成された弁作動油室１２に慴動自在に収容された
ピストン部１１が形成されており、前記増圧ピストン３
の中空部４はプレフィル用油タンクに連通可能であり、
前記弁作動室１２及び前記増圧シリンダー２内の増圧ピ
ストン３後端は油圧源に連通可能であることを特徴とす
る型締シリンダーのための増圧機構を内蔵したプレフィ
ル弁。(1) A pressure booster cylinder 2 communicating with the mold clamping cylinder 1, a pressure booster piston 3 slidably inserted into the pressure booster cylinder 2, and a hollow portion 4 formed within the pressure booster piston 3.
The prefill valve body 8 is slidably assembled into the valve seat 9 formed in the tip opening 4a of the pressure increase piston 3 that communicates with the mold clamping cylinder 1. At the rear end of the valve rod 10 of the prefilled valve body 8, a piston part 11 is slidably accommodated in a valve operating oil chamber 12 formed at the rear of the pressure booster piston 3. is formed, and the pressure increase piston 3
The hollow part 4 can communicate with the prefill oil tank,
A prefill valve incorporating a pressure increasing mechanism for a mold clamping cylinder, characterized in that the valve operating chamber 12 and the rear end of the pressure increasing piston 3 in the pressure increasing cylinder 2 can communicate with a hydraulic pressure source.
しバネ１５が介装されていて、プレフィル弁体８を増圧
ピストン３の弁座９に着座させるように付勢しているこ
とを特徴とする請求項１に記載された型締シリンダーの
ための増圧機構を内蔵したプレフィル弁。(2) A return spring 15 is interposed between the prefill valve body 8 and the pressure boosting piston 3, and urges the prefill valve body 8 to seat on the valve seat 9 of the pressure boost piston 3. A prefill valve having a built-in pressure increasing mechanism for a mold clamping cylinder according to claim 1.
受圧面積が、該ピストン３先端の断面積より大きく形成
されていることを特徴とする請求項１に記載された型締
シリンダーのための増圧機構を内蔵したプレフィル弁。(3) The mold clamping cylinder according to claim 1, wherein the pressure receiving area at the rear end of the pressure increasing piston 3 in the pressure increasing cylinder 2 is formed larger than the cross-sectional area at the tip of the piston 3. A prefill valve with a built-in pressure increase mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3891788A JP2622981B2 (en) | 1988-02-22 | 1988-02-22 | Prefill valve with built-in pressure increase mechanism for mold clamping cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3891788A JP2622981B2 (en) | 1988-02-22 | 1988-02-22 | Prefill valve with built-in pressure increase mechanism for mold clamping cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01214420A true JPH01214420A (en) | 1989-08-28 |
| JP2622981B2 JP2622981B2 (en) | 1997-06-25 |
Family
ID=12538563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3891788A Expired - Fee Related JP2622981B2 (en) | 1988-02-22 | 1988-02-22 | Prefill valve with built-in pressure increase mechanism for mold clamping cylinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2622981B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020113346A1 (en) * | 2018-12-06 | 2020-06-11 | Marc Lecours | Molding and slide apparatus system |
-
1988
- 1988-02-22 JP JP3891788A patent/JP2622981B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020113346A1 (en) * | 2018-12-06 | 2020-06-11 | Marc Lecours | Molding and slide apparatus system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2622981B2 (en) | 1997-06-25 |
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