JPH0649312B2 - Injection molding machine - Google Patents

Injection molding machine

Info

Publication number
JPH0649312B2
JPH0649312B2 JP18389486A JP18389486A JPH0649312B2 JP H0649312 B2 JPH0649312 B2 JP H0649312B2 JP 18389486 A JP18389486 A JP 18389486A JP 18389486 A JP18389486 A JP 18389486A JP H0649312 B2 JPH0649312 B2 JP H0649312B2
Authority
JP
Japan
Prior art keywords
plunger
barrel
pressure
stuffer
molding machine
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
Application number
JP18389486A
Other languages
Japanese (ja)
Other versions
JPS6339313A (en
Inventor
雄文 園田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ube Corp
Original Assignee
Ube Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ube Industries Ltd filed Critical Ube Industries Ltd
Priority to JP18389486A priority Critical patent/JPH0649312B2/en
Publication of JPS6339313A publication Critical patent/JPS6339313A/en
Publication of JPH0649312B2 publication Critical patent/JPH0649312B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • 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
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C2045/536—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston rotatable injection plungers

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は射出成形機に係り、特にＢＭＣ(Bulk Molding
Compound)等の塊状でガラス繊維を含む成形材料に好適
に用いられる射出成形機に関するものである。The present invention relates to an injection molding machine, and more particularly to BMC (Bulk Molding).
The present invention relates to an injection molding machine suitably used for a molding material containing a glass fiber such as a compound.

［従来の技術］ ペレット状材料を用いる射出成形機の場合、バレル内へ
の材料供給は、ホッパで行われ、供給量を調整する目的
で、更にスクリュコンベアを用いるケースがある。これ
に対して、ＢＭＣ等の塊状の成形材料の場合は、ホッパ
のみでは射出成形機のバレル内への材料供給が困難であ
り、スタッファ等を備えた材料押圧供給装置で成形材料
を加圧供給することが行われる。[Prior Art] In the case of an injection molding machine using a pelletized material, the material is supplied into the barrel by a hopper, and in some cases, a screw conveyor is used for the purpose of adjusting the supply amount. On the other hand, in the case of a block-shaped molding material such as BMC, it is difficult to supply the material into the barrel of the injection molding machine only with the hopper, and the molding material is pressurized by the material pressing and supplying device equipped with a stuffer. Supply is done.

このような材料押圧供給装置では、スタッファ筒体と、
スタッファプランジャの間がほぼシールされ、スタッフ
ァプランジャを移動させ、材料を加圧する。加圧圧力は
一般に百〜数kg／cm2（樹脂圧力に換算した値）であ
る。In such a material pressing and supplying device, a stuffer cylinder and
The seal between the stuffer plungers is almost complete, moving the stuffer plungers and pressurizing the material. The pressurizing pressure is generally 100 to several kg / cm 2 (value converted into resin pressure).

材料はスタッファからバレル内に加圧供給され、スクリ
ュ又はプランジャで計量され、射出成形される。The material is supplied under pressure from the stuffer into the barrel, weighed with a screw or a plunger, and injection molded.

射出を行う場合、材料の逆流を防ぎ、また、所要の射出
圧力を発生させるため、バレル内のスクリュ又はプラン
ジャにチェックリング等の逆流防止機構が設けられてい
る。射出圧力は、一般に数百〜数千kg／cm2（樹脂圧力
に換算した値）である。When performing injection, a backflow prevention mechanism such as a check ring is provided in a screw or a plunger in the barrel to prevent backflow of the material and generate a required injection pressure. The injection pressure is generally several hundred to several thousand kg / cm 2 (value converted into resin pressure).

なお、逆流防止機構としてチェックリング方式のものを
採用した場合、計量（又は可塑化）時は、チェックリン
グはバレルの前方に位置し、材料はチェックリング部を
通過して、スクリュ（又はプランジャ）の前方に溜めら
れる。また、射出時には、チェックリングが貯留された
該材料の退路を塞ぐようにしてスクリュ（又はプランジ
ャ）が前進し、スクリュ（又はプランジャ）前方の材料
圧力が上昇する。なお、チェックリング等の逆流防止機
構によって材料の退路を塞ぐことを、以下シールという
ことにする。When a check ring system is used as the backflow prevention mechanism, the check ring is located in front of the barrel during weighing (or plasticizing), and the material passes through the check ring part and the screw (or plunger) Is stored in front of. Further, at the time of injection, the screw (or plunger) advances so that the check ring closes the retracted path of the material, and the material pressure in front of the screw (or plunger) rises. It should be noted that closing the material retreat path by a backflow prevention mechanism such as a check ring will be referred to as a seal hereinafter.

［発明が解決しようとする問題点］ しかし、本発明者らが上記の如き射出成形機について種
々検討を加えたところ、射出時にチェックリングでシー
ルするタイミングが遅れたり、材料がチェックリング部
からリークする等の理由により、チェックリング部とス
タッファ等の材料押圧供給装置の間の部分にて圧力が異
常に上昇することがあることが認められた。なお、この
現象は、長期間成形機を運転し、チェックリングが摩耗
すると生じ易くなることも認められた。[Problems to be Solved by the Invention] However, when the present inventors have made various studies on the injection molding machine as described above, the timing of sealing with a check ring during injection is delayed, or the material leaks from the check ring part. It has been found that the pressure may abnormally increase in the portion between the check ring portion and the material pressing and supplying device such as the stuffer due to the reasons such as the above. It was also confirmed that this phenomenon is likely to occur when the molding machine is operated for a long time and the check ring is worn.

通常、バレル部分は、射出圧力に耐えるように設計され
ており、上記現象が生じても何らの問題も生じないが、
スタッファ部では設計圧力が低く、上記圧力に耐え得な
いおそれがある。また、スタッファプランジャを通じて
油圧ラインにも設定圧力以上の圧力が生じるおそれがあ
る。Normally, the barrel part is designed to withstand the injection pressure, and even if the above phenomenon occurs, no problem occurs,
The staffer may have a low design pressure and may not be able to withstand the above pressure. Further, there is a possibility that a pressure higher than the set pressure may be generated in the hydraulic line through the stuffer plunger.

［問題点を解決するための手段］ 本発明は、加圧された作動流体による押圧方式の材料押
圧供給装置をバレルの材料入口部に連設すると共に、材
料逆流防止機構を有するプランジャをバレル内に前後進
可能に設け、かつ前記材料押圧装置への作動流体供給系
統にリリーフ弁を設けたものである。[Means for Solving Problems] According to the present invention, a material pressing and supplying device of a pressing system using a pressurized working fluid is connected to a material inlet of a barrel, and a plunger having a material backflow prevention mechanism is provided in the barrel. And a relief valve in the working fluid supply system to the material pressing device.

［作用］ 本発明の射出成形機においては、射出時に、チェックリ
ング等の材料逆流防止機構でシールするタイミングが遅
れたり材料がリークし、逆流防止機構とスタッファの間
の圧力が上昇しようとしても、材料押圧供給装置の作動
流体供給系統に、リリーフ弁を設けたことにより、上記
の圧力上昇を解放することができ、スタッファ等の押圧
供給装置やその作動流体供給系統に異常な高圧が生ずる
ことを防止できる。[Operation] In the injection molding machine of the present invention, at the time of injection, even if the timing of sealing by the material backflow prevention mechanism such as a check ring is delayed or the material leaks, the pressure between the backflow prevention mechanism and the stuffer tries to rise. By providing a relief valve in the working fluid supply system of the material pressing and supplying device, the above pressure increase can be released, and an abnormally high pressure is generated in the pressing and supplying device such as a stuffer and its working fluid supplying system. Can be prevented.

［実施例］ 以下図面を参照して実施例について説明する。Embodiments Embodiments will be described below with reference to the drawings.

第１図は本発明に係る射出成形機の実施例を示す概略縦
断面図である。図において、先端部にノズル２１を有
し、外周部に比較的低温のヒータを有する円筒状のバレ
ル２２は、固定盤６０に取付けられている固定金型６１
の材料注入口にノズル２１を臨ませうるようにして配設
されている。６２はコラム、６３はコラムナット、６４
は型締装置側のマシンベース、６５は射出装置側のマシ
ンベース、６６はマシンベース６５上で軸線方向に摺動
自在に設けたブロックであり、ブロック６６の上には、
前方にバレル２２が固定されており、後方にはモータ保
持部材６７が摺動自在に取付けられている。６８は固定
盤６０に固定されたブロック６６移動用のシリンダ、６
９はピストンロッドで、ピストンロッド６９の先端部は
ブロック６６の外側面中央部に固定されており、シリン
ダ６８の作動により、ノズル２１を固定金型６１に接触
させたり、図示した状態に後退させたりしうるようにし
た。FIG. 1 is a schematic vertical sectional view showing an embodiment of an injection molding machine according to the present invention. In the figure, a cylindrical barrel 22 having a nozzle 21 at its tip and a heater at a relatively low temperature on its outer periphery is a fixed mold 61 attached to a stationary plate 60.
It is arranged so that the nozzle 21 can face the material injection port. 62 is a column, 63 is a column nut, 64
Is a machine base on the mold clamping device side, 65 is a machine base on the injection device side, 66 is a block slidably provided on the machine base 65 in the axial direction, and on the block 66,
The barrel 22 is fixed to the front, and the motor holding member 67 is slidably attached to the rear. 68 is a cylinder for moving the block 66 fixed to the fixed plate 60, 6
Reference numeral 9 is a piston rod, and the tip end of the piston rod 69 is fixed to the central portion of the outer surface of the block 66, and the nozzle 21 is brought into contact with the fixed mold 61 or retracted to the illustrated state by the operation of the cylinder 68. I made it possible.

バレル２２内には、バレル２２内径よりも小さな外径を
有し、先端付近にチェックリング２３やボールなどから
なる逆流防止機構を有するプランジャ２４を、前後進可
能に、かつ、回転可能に設けた。そして、バレル２２内
周面とプランジャ２４の外周面との間に材料の通路７０
を設けた。プランジャ２４の後方には、モータ保持部材
６７内の軸受部７１を介して、モータ保持部材６７に固
定した油圧モータ３５などの回転駆動装置の軸が連結さ
れている。また、バレル２２とモータ保持部材６７の下
側の間には、射出シリンダ７２とピストンロッド７３が
取付けられている。In the barrel 22, a plunger 24 having an outer diameter smaller than the inner diameter of the barrel 22 and having a backflow prevention mechanism including a check ring 23, a ball and the like near the tip is provided so as to be able to move forward and backward and to rotate. . The material passage 70 is provided between the inner peripheral surface of the barrel 22 and the outer peripheral surface of the plunger 24.
Was set up. A shaft of a rotary drive device such as a hydraulic motor 35 fixed to the motor holding member 67 is connected to the rear of the plunger 24 via a bearing 71 in the motor holding member 67. An injection cylinder 72 and a piston rod 73 are attached between the barrel 22 and the lower side of the motor holding member 67.

プランジャ２４の中央部には、バレル２２の内周面に接
した凸部２５を設けた。また、プランジャ２４の凸部２
５の後側には、リーク材料排出用のスクリュ２９を設け
た。このスクリュ２９は、凸部２５の外周面とバレル２
２の内周面の間のクリアランス部分から後方に漏れたリ
ーク材料を、バレル２２の後方にスムーズに排出するた
めのものであり、プランジャ２４の回転方向とは逆ねじ
方向に設けられている。At the center of the plunger 24, a convex portion 25 that is in contact with the inner peripheral surface of the barrel 22 is provided. In addition, the convex portion 2 of the plunger 24
On the rear side of No. 5, a screw 29 for discharging the leak material was provided. The screw 29 includes the outer peripheral surface of the convex portion 25 and the barrel 2
The leak material leaked rearward from the clearance between the inner peripheral surfaces of the two is smoothly discharged rearward of the barrel 22, and is provided in a direction opposite to the rotational direction of the plunger 24.

２７はバレル２２の後部側の材料入口部２８に垂直に設
けたスタッファで、その内部には材料を押下げるスタッ
ファプランジャ３０が設けられている。３１はスタッフ
ァ２７の側面部に設けた材料供給用の入口である。７４
はスタッファプランジャ３０用のシリンダで、ピストン
７４ａを内蔵し、バレル２２の一部に上向きに垂直に取
付けられている。７５はピストンロッド、７６は連結部
材である。Reference numeral 27 denotes a stuffer vertically provided in the material inlet portion 28 on the rear side of the barrel 22, and a stuffer plunger 30 for pushing down the material is provided therein. Reference numeral 31 is a material supply inlet provided on the side surface of the stuffer 27. 74
Is a cylinder for the stuffer plunger 30, which has a built-in piston 74a and is vertically attached to a part of the barrel 22 in an upward direction. 75 is a piston rod, and 76 is a connecting member.

本実施例において、シリンダ７４は、複動形のものであ
り、上端側の往動ポート及び下端側の復動ポートにそれ
ぞれ油圧配管８１、８２が接続されている。これら配管
８１、８２はその途中にチェック付フローコントロール
弁８３、８４及びパイロットオペレートチェック弁８
５、８６が配置され、切換弁（スプリングセンタ式４ポ
ート３位置切換弁）８７のＡポート及びＢポートに接続
されている。切換弁８７のＰポートには油圧ポンプが接
続され、Ｔポートにはタンク８８が接続される。上記配
管８１、８２のパイロットオペレート式チェック弁８
５、８６は、それぞれのパイロットポートを反対側の配
管８２、８１の切換弁８７側に接続してロッキング回路
を構成している。符号８９は復動側の配管から分岐され
た配管９０に介設されたリリーフ弁である。なお、配管
９０はタンク８８に通じている。In this embodiment, the cylinder 74 is a double-acting type, and hydraulic pipes 81 and 82 are connected to the forward movement port on the upper end side and the return movement port on the lower end side, respectively. These pipes 81 and 82 are provided with check flow control valves 83 and 84 and pilot operated check valve 8 along the way.
5, 86 are arranged and connected to the A port and the B port of the switching valve (spring center type 4-port 3-position switching valve) 87. A hydraulic pump is connected to the P port of the switching valve 87, and a tank 88 is connected to the T port. Pilot operated check valve 8 for the pipes 81 and 82
Reference numerals 5 and 86 connect the respective pilot ports to the switching valve 87 side of the pipes 82 and 81 on the opposite side to form a locking circuit. Reference numeral 89 is a relief valve provided in a pipe 90 branched from the return-side pipe. The pipe 90 communicates with the tank 88.

かかる構成の油圧回路において、切換弁のスプールを図
の右側に押し込めば、油圧がＢポートからシリンダ７４
の往動側（図の上側）の室に導入され、ピストン７４ａ
が押し下げられ、スタッファプランジャ３０が下降す
る。また、切換弁８７のスプールを左側に押し込むと、
逆に油圧がピストン７４ａの下側に導入され、ピストン
７４ａとスタッファプランジャ３０とが上昇する。In the hydraulic circuit having such a configuration, if the spool of the switching valve is pushed to the right side of the drawing, the hydraulic pressure will change from the B port to the cylinder 74.
Of the piston 74a.
Is pushed down, and the staffer plunger 30 descends. Also, if the spool of the switching valve 87 is pushed to the left,
On the contrary, hydraulic pressure is introduced to the lower side of the piston 74a, and the piston 74a and the stuffer plunger 30 move up.

また、図示の中立位置では、チェック弁８５、８６によ
って構成されるロッキング回路の作用によって、スタッ
ファの停止位置が保持される。In the illustrated neutral position, the locking position of the stuffer is maintained by the action of the locking circuit formed by the check valves 85 and 86.

そして、スタッファプランジャ３０に、過大な圧力（押
し上げ力）が作用して管路８１内の油圧が設定圧を超え
ると、リリーフ弁８９が開放し、この圧を逃がす。その
ため、スタッファ２７や油圧系統の過大圧力による損壊
が防止される。Then, when an excessive pressure (pushing force) acts on the stuffer plunger 30 and the hydraulic pressure in the conduit 81 exceeds the set pressure, the relief valve 89 opens, and this pressure is released. Therefore, damage due to excessive pressure of the stuffer 27 and the hydraulic system is prevented.

第１図に示した装置において、プランジャ２４を前進限
に位置させ、例えば２５〜１５０ｒｐｍで回転させてい
る状態で、スタッファ２７中にＢＭＣなどの材料を装入
し、スタッファプランジャ３０で材料を押し下げる。そ
うすると、材料はプランジャ２４の外周部を通って前方
に送られ、チェックリング２３部を通ってプランジャ２
４の前のバレル２２内に順次溜められる。勿論、この計
量過程においては、プランジャ２４は徐々に後退する。
なお、材料のＢＭＣを用いる場合は、材料の温度を例え
ば４０〜６０℃とし、射出する金型の温度を約１６０℃
とし、スタッファプランジャ３０で押し下げる圧力を例
えば数kg／cm2〜１４０kg／cm2とした。In the apparatus shown in FIG. 1, the material such as BMC is loaded into the stuffer 27 while the plunger 24 is positioned at the forward limit and is rotated at 25 to 150 rpm, and the material is fed by the stuffer plunger 30. Push down. Then, the material is sent forward through the outer peripheral portion of the plunger 24, and passes through the check ring 23 portion to make the plunger 2
4 are sequentially accumulated in the barrel 22. Of course, in this measuring process, the plunger 24 is gradually retracted.
When using BMC as the material, the temperature of the material is, for example, 40 to 60 ° C., and the temperature of the die for injection is about 160 ° C.
And then was pressure and, for example, several kg / cm 2 ~140kg / cm 2 to depress at stuffer plunger 30.

このとき、プランジャ２４の後方に連結した射出シリン
ダ７２のロッドエンド側室内の油圧を制御することによ
って、材料に背圧をかけることができる。なお、後退す
るプランジャ２４の凸部２５の外周面とバレル２２の内
周面間の摩擦によっても材料に背圧をかけることができ
る。At this time, the back pressure can be applied to the material by controlling the hydraulic pressure in the rod end side chamber of the injection cylinder 72 connected to the rear of the plunger 24. Note that the back pressure can be applied to the material by friction between the outer peripheral surface of the convex portion 25 of the plunger 24 and the inner peripheral surface of the barrel 22, which retracts.

プランジャ２４の回転により、プランジャ２４の周囲の
樹脂材料は均質化されるとともに、材料の流路の短絡が
防止される。また、スタッファプランジャ３０の押圧作
用とプランジャ２４の回転作用で、材料はプランジャ２
４の上側の材料通路７０のみを通ることなく、プランジ
ャ２４の下側の材料通路７０の方にも回り込むような状
態で押込まれ、また、材料がプランジャ２４の下側から
上側へも、あるいは上側から下側へも回り込みながら送
られるので、材料の流れにくい部分や流れにくい材料で
もバレル２２内に滞留することなく、２２内の全周全体
を円滑に移送される。Due to the rotation of the plunger 24, the resin material around the plunger 24 is homogenized and a short circuit of the flow path of the material is prevented. Further, the pressing action of the stuffer plunger 30 and the rotating action of the plunger 24 cause the material to be
4, the material is pushed in such a manner that it does not pass only through the upper material passage 70 of the plunger 24 but also around the lower material passage 70 of the plunger 24, and the material is transferred from the lower side of the plunger 24 to the upper side or the upper side. Since it is sent while also wrapping around to the lower side, even the portion where the material does not easily flow and the material which does not easily flow do not stay in the barrel 22, and the entire circumference of the inside of the barrel 22 is smoothly transferred.

バレル２２の先端部に所望量の材料が溜まれば、プラン
ジャ２４の回転を止め、射出シリンダ７２を作用させて
プランジャ２４を前進させ、金型内に材料を射出する。When a desired amount of material is accumulated at the tip of the barrel 22, the rotation of the plunger 24 is stopped, the injection cylinder 72 is actuated to move the plunger 24 forward, and the material is injected into the mold.

なお、上記実施例装置において、プランジャ２４を回転
させずに、スタッファプランジャ３０の押圧作用のみで
材料であるＢＭＣをバレル２２内に押込んだ場合、材料
はほとんどバレル２２の一部にとどまって、円滑に送ら
れず、計量状態が極めて悪かった。また、スタッファプ
ランジャ３０による押圧圧力を非常に大きくしても、や
はり、ＢＭＣの計量能は悪かったが、プランジャ２４を
例えば２５〜１５０ｒｐｍのように比較的に低速で回転
させた状態で、スタッファプランジャ３０でＢＭＣを押
込めば、ＢＭＣはバレル２２内の全体に入って送られ、
計量作用も円滑にかつ確実容易に行われた。In the apparatus of the above-described embodiment, when BMC, which is the material, is pushed into the barrel 22 only by the pressing action of the stuffer plunger 30 without rotating the plunger 24, the material remains in a part of the barrel 22. , It was not sent smoothly, and the weighing condition was extremely poor. Further, even if the pressing pressure by the stuffer plunger 30 is made extremely large, the BMC weighing ability was still poor, but the staff 24 was rotated at a relatively low speed, for example, 25 to 150 rpm. If the BMC is pushed in with the flanger 30, the BMC is sent all over the barrel 22,
The weighing action was smooth, reliable and easy.

上記実施例では、バレル内にプランジャを挿設する構成
としたが、本発明はスクリュなどを挿設した射出成形機
にも適用できる。In the above embodiment, the plunger is inserted in the barrel, but the present invention can be applied to an injection molding machine in which a screw or the like is inserted.

また、上記実施例では、スタッファプランジャによる押
圧供給装置が示されているが、その他の押圧供給装置で
あっても良い。この押圧供給装置の作動流体は、油圧に
限らず、水圧や空気圧等でおっても良い。Further, in the above-mentioned embodiment, the pressing supply device by the stuffer plunger is shown, but other pressing supply devices may be used. The working fluid of this pressure supply device is not limited to hydraulic pressure, and may be water pressure, air pressure, or the like.

［効果］ 以上の通り、本発明は、射出成形機に付設された材料押
圧供給装置の作動流体供給系統にリリーフ弁を設けたの
で、該押圧供給装置に作用する材料側からの過大圧力を
逃がすことができ、該押圧供給装置や作動流体供給系統
等の保安性を顕著に高めることができる。[Effects] As described above, according to the present invention, since the relief valve is provided in the working fluid supply system of the material pressure supply device attached to the injection molding machine, the excessive pressure from the material side acting on the pressure supply device is released. Therefore, it is possible to remarkably enhance the security of the pressurizing supply device, the working fluid supply system, and the like.

【図面の簡単な説明】[Brief description of drawings]

第１図は本発明の実施例を示す縦断面図である。 ２２…バレル、２３…チェックリング、 ２４…プランジャ、２７…スタッファ、 ３０…スタッファプランジャ、 ７０…材料通路、７４…シリンダ、 ８７…切換弁、８９…リリーフ弁。 FIG. 1 is a vertical sectional view showing an embodiment of the present invention. 22 ... Barrel, 23 ... Check ring, 24 ... Plunger, 27 ... Staffer, 30 ... Staffer plunger, 70 ... Material passage, 74 ... Cylinder, 87 ... Switching valve, 89 ... Relief valve.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】加圧された作動流体による押圧方式の材料
押圧供給装置をバレルの材料入口部に連設すると共に、
材料逆流防止機構を有するプランジャをバレル内に前後
進可能に設け、かつ前記材料押圧装置への作動流体供給
系統にリリーフ弁を設けたことを特徴とする射出成形
機。1. A material pressure supply device of a pressure system using a pressurized working fluid is connected to a material inlet portion of a barrel, and
An injection molding machine characterized in that a plunger having a material backflow prevention mechanism is provided in a barrel so as to be able to move forward and backward, and a relief valve is provided in a working fluid supply system to the material pressing device.
JP18389486A 1986-08-05 1986-08-05 Injection molding machine Expired - Lifetime JPH0649312B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18389486A JPH0649312B2 (en) 1986-08-05 1986-08-05 Injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18389486A JPH0649312B2 (en) 1986-08-05 1986-08-05 Injection molding machine

Publications (2)

Publication Number Publication Date
JPS6339313A JPS6339313A (en) 1988-02-19
JPH0649312B2 true JPH0649312B2 (en) 1994-06-29

Family

ID=16143674

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18389486A Expired - Lifetime JPH0649312B2 (en) 1986-08-05 1986-08-05 Injection molding machine

Country Status (1)

Country Link
JP (1) JPH0649312B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0813483B2 (en) * 1988-08-29 1996-02-14 株式会社名機製作所 Injection pressure control method for injection molding machine

Also Published As

Publication number Publication date
JPS6339313A (en) 1988-02-19

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